diff options
Diffstat (limited to 'net/batman-adv')
55 files changed, 35031 insertions, 0 deletions
diff --git a/net/batman-adv/Kconfig b/net/batman-adv/Kconfig new file mode 100644 index 000000000..860a0786b --- /dev/null +++ b/net/batman-adv/Kconfig @@ -0,0 +1,96 @@ +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) B.A.T.M.A.N. contributors: +# +# Marek Lindner, Simon Wunderlich + +# +# B.A.T.M.A.N meshing protocol +# + +config BATMAN_ADV + tristate "B.A.T.M.A.N. Advanced Meshing Protocol" + select LIBCRC32C + help + B.A.T.M.A.N. (better approach to mobile ad-hoc networking) is + a routing protocol for multi-hop ad-hoc mesh networks. The + networks may be wired or wireless. See + https://www.open-mesh.org/ for more information and user space + tools. + +config BATMAN_ADV_BATMAN_V + bool "B.A.T.M.A.N. V protocol" + depends on BATMAN_ADV && !(CFG80211=m && BATMAN_ADV=y) + default y + help + This option enables the B.A.T.M.A.N. V protocol, the successor + of the currently used B.A.T.M.A.N. IV protocol. The main + changes include splitting of the OGM protocol into a neighbor + discovery protocol (Echo Location Protocol, ELP) and a new OGM + Protocol OGMv2 for flooding protocol information through the + network, as well as a throughput based metric. + B.A.T.M.A.N. V is currently considered experimental and not + compatible to B.A.T.M.A.N. IV networks. + +config BATMAN_ADV_BLA + bool "Bridge Loop Avoidance" + depends on BATMAN_ADV && INET + select CRC16 + default y + help + This option enables BLA (Bridge Loop Avoidance), a mechanism + to avoid Ethernet frames looping when mesh nodes are connected + to both the same LAN and the same mesh. If you will never use + more than one mesh node in the same LAN, you can safely remove + this feature and save some space. + +config BATMAN_ADV_DAT + bool "Distributed ARP Table" + depends on BATMAN_ADV && INET + default y + help + This option enables DAT (Distributed ARP Table), a DHT based + mechanism that increases ARP reliability on sparse wireless + mesh networks. If you think that your network does not need + this option you can safely remove it and save some space. + +config BATMAN_ADV_NC + bool "Network Coding" + depends on BATMAN_ADV + help + This option enables network coding, a mechanism that aims to + increase the overall network throughput by fusing multiple + packets in one transmission. + Note that interfaces controlled by batman-adv must be manually + configured to have promiscuous mode enabled in order to make + network coding work. + If you think that your network does not need this feature you + can safely disable it and save some space. + +config BATMAN_ADV_MCAST + bool "Multicast optimisation" + depends on BATMAN_ADV && INET && !(BRIDGE=m && BATMAN_ADV=y) + default y + help + This option enables the multicast optimisation which aims to + reduce the air overhead while improving the reliability of + multicast messages. + +config BATMAN_ADV_DEBUG + bool "B.A.T.M.A.N. debugging" + depends on BATMAN_ADV + help + This is an option for use by developers; most people should + say N here. This enables compilation of support for + outputting debugging information to the tracing buffer. The output is + controlled via the batadv netdev specific log_level setting. + +config BATMAN_ADV_TRACING + bool "B.A.T.M.A.N. tracing support" + depends on BATMAN_ADV + depends on EVENT_TRACING + help + This is an option for use by developers; most people should + say N here. Select this option to gather traces like the debug + messages using the generic tracing infrastructure of the kernel. + BATMAN_ADV_DEBUG must also be selected to get trace events for + batadv_dbg. diff --git a/net/batman-adv/Makefile b/net/batman-adv/Makefile new file mode 100644 index 000000000..3bd0760c7 --- /dev/null +++ b/net/batman-adv/Makefile @@ -0,0 +1,34 @@ +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) B.A.T.M.A.N. contributors: +# +# Marek Lindner, Simon Wunderlich + +obj-$(CONFIG_BATMAN_ADV) += batman-adv.o +batman-adv-y += bat_algo.o +batman-adv-y += bat_iv_ogm.o +batman-adv-$(CONFIG_BATMAN_ADV_BATMAN_V) += bat_v.o +batman-adv-$(CONFIG_BATMAN_ADV_BATMAN_V) += bat_v_elp.o +batman-adv-$(CONFIG_BATMAN_ADV_BATMAN_V) += bat_v_ogm.o +batman-adv-y += bitarray.o +batman-adv-$(CONFIG_BATMAN_ADV_BLA) += bridge_loop_avoidance.o +batman-adv-$(CONFIG_BATMAN_ADV_DAT) += distributed-arp-table.o +batman-adv-y += fragmentation.o +batman-adv-y += gateway_client.o +batman-adv-y += gateway_common.o +batman-adv-y += hard-interface.o +batman-adv-y += hash.o +batman-adv-$(CONFIG_BATMAN_ADV_DEBUG) += log.o +batman-adv-y += main.o +batman-adv-$(CONFIG_BATMAN_ADV_MCAST) += multicast.o +batman-adv-y += netlink.o +batman-adv-$(CONFIG_BATMAN_ADV_NC) += network-coding.o +batman-adv-y += originator.o +batman-adv-y += routing.o +batman-adv-y += send.o +batman-adv-y += soft-interface.o +batman-adv-$(CONFIG_BATMAN_ADV_TRACING) += trace.o +batman-adv-y += tp_meter.o +batman-adv-y += translation-table.o +batman-adv-y += tvlv.o + +CFLAGS_trace.o := -I$(src) diff --git a/net/batman-adv/bat_algo.c b/net/batman-adv/bat_algo.c new file mode 100644 index 000000000..4eee53d19 --- /dev/null +++ b/net/batman-adv/bat_algo.c @@ -0,0 +1,209 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + */ + +#include "main.h" + +#include <linux/errno.h> +#include <linux/list.h> +#include <linux/moduleparam.h> +#include <linux/netlink.h> +#include <linux/printk.h> +#include <linux/skbuff.h> +#include <linux/stddef.h> +#include <linux/string.h> +#include <net/genetlink.h> +#include <net/netlink.h> +#include <uapi/linux/batman_adv.h> + +#include "bat_algo.h" +#include "netlink.h" + +char batadv_routing_algo[20] = "BATMAN_IV"; +static struct hlist_head batadv_algo_list; + +/** + * batadv_algo_init() - Initialize batman-adv algorithm management data + * structures + */ +void batadv_algo_init(void) +{ + INIT_HLIST_HEAD(&batadv_algo_list); +} + +/** + * batadv_algo_get() - Search for algorithm with specific name + * @name: algorithm name to find + * + * Return: Pointer to batadv_algo_ops on success, NULL otherwise + */ +struct batadv_algo_ops *batadv_algo_get(const char *name) +{ + struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp; + + hlist_for_each_entry(bat_algo_ops_tmp, &batadv_algo_list, list) { + if (strcmp(bat_algo_ops_tmp->name, name) != 0) + continue; + + bat_algo_ops = bat_algo_ops_tmp; + break; + } + + return bat_algo_ops; +} + +/** + * batadv_algo_register() - Register callbacks for a mesh algorithm + * @bat_algo_ops: mesh algorithm callbacks to add + * + * Return: 0 on success or negative error number in case of failure + */ +int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops) +{ + struct batadv_algo_ops *bat_algo_ops_tmp; + + bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name); + if (bat_algo_ops_tmp) { + pr_info("Trying to register already registered routing algorithm: %s\n", + bat_algo_ops->name); + return -EEXIST; + } + + /* all algorithms must implement all ops (for now) */ + if (!bat_algo_ops->iface.enable || + !bat_algo_ops->iface.disable || + !bat_algo_ops->iface.update_mac || + !bat_algo_ops->iface.primary_set || + !bat_algo_ops->neigh.cmp || + !bat_algo_ops->neigh.is_similar_or_better) { + pr_info("Routing algo '%s' does not implement required ops\n", + bat_algo_ops->name); + return -EINVAL; + } + + INIT_HLIST_NODE(&bat_algo_ops->list); + hlist_add_head(&bat_algo_ops->list, &batadv_algo_list); + + return 0; +} + +/** + * batadv_algo_select() - Select algorithm of soft interface + * @bat_priv: the bat priv with all the soft interface information + * @name: name of the algorithm to select + * + * The algorithm callbacks for the soft interface will be set when the algorithm + * with the correct name was found. Any previous selected algorithm will not be + * deinitialized and the new selected algorithm will also not be initialized. + * It is therefore not allowed to call batadv_algo_select outside the creation + * function of the soft interface. + * + * Return: 0 on success or negative error number in case of failure + */ +int batadv_algo_select(struct batadv_priv *bat_priv, const char *name) +{ + struct batadv_algo_ops *bat_algo_ops; + + bat_algo_ops = batadv_algo_get(name); + if (!bat_algo_ops) + return -EINVAL; + + bat_priv->algo_ops = bat_algo_ops; + + return 0; +} + +static int batadv_param_set_ra(const char *val, const struct kernel_param *kp) +{ + struct batadv_algo_ops *bat_algo_ops; + char *algo_name = (char *)val; + size_t name_len = strlen(algo_name); + + if (name_len > 0 && algo_name[name_len - 1] == '\n') + algo_name[name_len - 1] = '\0'; + + bat_algo_ops = batadv_algo_get(algo_name); + if (!bat_algo_ops) { + pr_err("Routing algorithm '%s' is not supported\n", algo_name); + return -EINVAL; + } + + return param_set_copystring(algo_name, kp); +} + +static const struct kernel_param_ops batadv_param_ops_ra = { + .set = batadv_param_set_ra, + .get = param_get_string, +}; + +static struct kparam_string batadv_param_string_ra = { + .maxlen = sizeof(batadv_routing_algo), + .string = batadv_routing_algo, +}; + +module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra, + 0644); + +/** + * batadv_algo_dump_entry() - fill in information about one supported routing + * algorithm + * @msg: netlink message to be sent back + * @portid: Port to reply to + * @seq: Sequence number of message + * @bat_algo_ops: Algorithm to be dumped + * + * Return: Error number, or 0 on success + */ +static int batadv_algo_dump_entry(struct sk_buff *msg, u32 portid, u32 seq, + struct batadv_algo_ops *bat_algo_ops) +{ + void *hdr; + + hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, + NLM_F_MULTI, BATADV_CMD_GET_ROUTING_ALGOS); + if (!hdr) + return -EMSGSIZE; + + if (nla_put_string(msg, BATADV_ATTR_ALGO_NAME, bat_algo_ops->name)) + goto nla_put_failure; + + genlmsg_end(msg, hdr); + return 0; + + nla_put_failure: + genlmsg_cancel(msg, hdr); + return -EMSGSIZE; +} + +/** + * batadv_algo_dump() - fill in information about supported routing + * algorithms + * @msg: netlink message to be sent back + * @cb: Parameters to the netlink request + * + * Return: Length of reply message. + */ +int batadv_algo_dump(struct sk_buff *msg, struct netlink_callback *cb) +{ + int portid = NETLINK_CB(cb->skb).portid; + struct batadv_algo_ops *bat_algo_ops; + int skip = cb->args[0]; + int i = 0; + + hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) { + if (i++ < skip) + continue; + + if (batadv_algo_dump_entry(msg, portid, cb->nlh->nlmsg_seq, + bat_algo_ops)) { + i--; + break; + } + } + + cb->args[0] = i; + + return msg->len; +} diff --git a/net/batman-adv/bat_algo.h b/net/batman-adv/bat_algo.h new file mode 100644 index 000000000..2c486374a --- /dev/null +++ b/net/batman-adv/bat_algo.h @@ -0,0 +1,25 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner, Linus Lüssing + */ + +#ifndef _NET_BATMAN_ADV_BAT_ALGO_H_ +#define _NET_BATMAN_ADV_BAT_ALGO_H_ + +#include "main.h" + +#include <linux/netlink.h> +#include <linux/skbuff.h> +#include <linux/types.h> + +extern char batadv_routing_algo[]; +extern struct list_head batadv_hardif_list; + +void batadv_algo_init(void); +struct batadv_algo_ops *batadv_algo_get(const char *name); +int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops); +int batadv_algo_select(struct batadv_priv *bat_priv, const char *name); +int batadv_algo_dump(struct sk_buff *msg, struct netlink_callback *cb); + +#endif /* _NET_BATMAN_ADV_BAT_ALGO_H_ */ diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c new file mode 100644 index 000000000..7f6a7c96a --- /dev/null +++ b/net/batman-adv/bat_iv_ogm.c @@ -0,0 +1,2551 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + */ + +#include "bat_iv_ogm.h" +#include "main.h" + +#include <linux/atomic.h> +#include <linux/bitmap.h> +#include <linux/bitops.h> +#include <linux/bug.h> +#include <linux/byteorder/generic.h> +#include <linux/cache.h> +#include <linux/container_of.h> +#include <linux/errno.h> +#include <linux/etherdevice.h> +#include <linux/gfp.h> +#include <linux/if_ether.h> +#include <linux/init.h> +#include <linux/jiffies.h> +#include <linux/kref.h> +#include <linux/list.h> +#include <linux/lockdep.h> +#include <linux/mutex.h> +#include <linux/netdevice.h> +#include <linux/netlink.h> +#include <linux/pkt_sched.h> +#include <linux/prandom.h> +#include <linux/printk.h> +#include <linux/random.h> +#include <linux/rculist.h> +#include <linux/rcupdate.h> +#include <linux/skbuff.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/stddef.h> +#include <linux/string.h> +#include <linux/types.h> +#include <linux/workqueue.h> +#include <net/genetlink.h> +#include <net/netlink.h> +#include <uapi/linux/batadv_packet.h> +#include <uapi/linux/batman_adv.h> + +#include "bat_algo.h" +#include "bitarray.h" +#include "gateway_client.h" +#include "hard-interface.h" +#include "hash.h" +#include "log.h" +#include "netlink.h" +#include "network-coding.h" +#include "originator.h" +#include "routing.h" +#include "send.h" +#include "translation-table.h" +#include "tvlv.h" + +static void batadv_iv_send_outstanding_bat_ogm_packet(struct work_struct *work); + +/** + * enum batadv_dup_status - duplicate status + */ +enum batadv_dup_status { + /** @BATADV_NO_DUP: the packet is no duplicate */ + BATADV_NO_DUP = 0, + + /** + * @BATADV_ORIG_DUP: OGM is a duplicate in the originator (but not for + * the neighbor) + */ + BATADV_ORIG_DUP, + + /** @BATADV_NEIGH_DUP: OGM is a duplicate for the neighbor */ + BATADV_NEIGH_DUP, + + /** + * @BATADV_PROTECTED: originator is currently protected (after reboot) + */ + BATADV_PROTECTED, +}; + +/** + * batadv_ring_buffer_set() - update the ring buffer with the given value + * @lq_recv: pointer to the ring buffer + * @lq_index: index to store the value at + * @value: value to store in the ring buffer + */ +static void batadv_ring_buffer_set(u8 lq_recv[], u8 *lq_index, u8 value) +{ + lq_recv[*lq_index] = value; + *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE; +} + +/** + * batadv_ring_buffer_avg() - compute the average of all non-zero values stored + * in the given ring buffer + * @lq_recv: pointer to the ring buffer + * + * Return: computed average value. + */ +static u8 batadv_ring_buffer_avg(const u8 lq_recv[]) +{ + const u8 *ptr; + u16 count = 0; + u16 i = 0; + u16 sum = 0; + + ptr = lq_recv; + + while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) { + if (*ptr != 0) { + count++; + sum += *ptr; + } + + i++; + ptr++; + } + + if (count == 0) + return 0; + + return (u8)(sum / count); +} + +/** + * batadv_iv_ogm_orig_get() - retrieve or create (if does not exist) an + * originator + * @bat_priv: the bat priv with all the soft interface information + * @addr: mac address of the originator + * + * Return: the originator object corresponding to the passed mac address or NULL + * on failure. + * If the object does not exist, it is created and initialised. + */ +static struct batadv_orig_node * +batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const u8 *addr) +{ + struct batadv_orig_node *orig_node; + int hash_added; + + orig_node = batadv_orig_hash_find(bat_priv, addr); + if (orig_node) + return orig_node; + + orig_node = batadv_orig_node_new(bat_priv, addr); + if (!orig_node) + return NULL; + + spin_lock_init(&orig_node->bat_iv.ogm_cnt_lock); + + kref_get(&orig_node->refcount); + hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig, + batadv_choose_orig, orig_node, + &orig_node->hash_entry); + if (hash_added != 0) + goto free_orig_node_hash; + + return orig_node; + +free_orig_node_hash: + /* reference for batadv_hash_add */ + batadv_orig_node_put(orig_node); + /* reference from batadv_orig_node_new */ + batadv_orig_node_put(orig_node); + + return NULL; +} + +static struct batadv_neigh_node * +batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface, + const u8 *neigh_addr, + struct batadv_orig_node *orig_node, + struct batadv_orig_node *orig_neigh) +{ + struct batadv_neigh_node *neigh_node; + + neigh_node = batadv_neigh_node_get_or_create(orig_node, + hard_iface, neigh_addr); + if (!neigh_node) + goto out; + + neigh_node->orig_node = orig_neigh; + +out: + return neigh_node; +} + +static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface) +{ + struct batadv_ogm_packet *batadv_ogm_packet; + unsigned char *ogm_buff; + u32 random_seqno; + + mutex_lock(&hard_iface->bat_iv.ogm_buff_mutex); + + /* randomize initial seqno to avoid collision */ + get_random_bytes(&random_seqno, sizeof(random_seqno)); + atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno); + + hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN; + ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC); + if (!ogm_buff) { + mutex_unlock(&hard_iface->bat_iv.ogm_buff_mutex); + return -ENOMEM; + } + + hard_iface->bat_iv.ogm_buff = ogm_buff; + + batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; + batadv_ogm_packet->packet_type = BATADV_IV_OGM; + batadv_ogm_packet->version = BATADV_COMPAT_VERSION; + batadv_ogm_packet->ttl = 2; + batadv_ogm_packet->flags = BATADV_NO_FLAGS; + batadv_ogm_packet->reserved = 0; + batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE; + + mutex_unlock(&hard_iface->bat_iv.ogm_buff_mutex); + + return 0; +} + +static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface) +{ + mutex_lock(&hard_iface->bat_iv.ogm_buff_mutex); + + kfree(hard_iface->bat_iv.ogm_buff); + hard_iface->bat_iv.ogm_buff = NULL; + + mutex_unlock(&hard_iface->bat_iv.ogm_buff_mutex); +} + +static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface) +{ + struct batadv_ogm_packet *batadv_ogm_packet; + void *ogm_buff; + + mutex_lock(&hard_iface->bat_iv.ogm_buff_mutex); + + ogm_buff = hard_iface->bat_iv.ogm_buff; + if (!ogm_buff) + goto unlock; + + batadv_ogm_packet = ogm_buff; + ether_addr_copy(batadv_ogm_packet->orig, + hard_iface->net_dev->dev_addr); + ether_addr_copy(batadv_ogm_packet->prev_sender, + hard_iface->net_dev->dev_addr); + +unlock: + mutex_unlock(&hard_iface->bat_iv.ogm_buff_mutex); +} + +static void +batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface) +{ + struct batadv_ogm_packet *batadv_ogm_packet; + void *ogm_buff; + + mutex_lock(&hard_iface->bat_iv.ogm_buff_mutex); + + ogm_buff = hard_iface->bat_iv.ogm_buff; + if (!ogm_buff) + goto unlock; + + batadv_ogm_packet = ogm_buff; + batadv_ogm_packet->ttl = BATADV_TTL; + +unlock: + mutex_unlock(&hard_iface->bat_iv.ogm_buff_mutex); +} + +/* when do we schedule our own ogm to be sent */ +static unsigned long +batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv) +{ + unsigned int msecs; + + msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; + msecs += prandom_u32_max(2 * BATADV_JITTER); + + return jiffies + msecs_to_jiffies(msecs); +} + +/* when do we schedule a ogm packet to be sent */ +static unsigned long batadv_iv_ogm_fwd_send_time(void) +{ + return jiffies + msecs_to_jiffies(prandom_u32_max(BATADV_JITTER / 2)); +} + +/* apply hop penalty for a normal link */ +static u8 batadv_hop_penalty(u8 tq, const struct batadv_priv *bat_priv) +{ + int hop_penalty = atomic_read(&bat_priv->hop_penalty); + int new_tq; + + new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty); + new_tq /= BATADV_TQ_MAX_VALUE; + + return new_tq; +} + +/** + * batadv_iv_ogm_aggr_packet() - checks if there is another OGM attached + * @buff_pos: current position in the skb + * @packet_len: total length of the skb + * @ogm_packet: potential OGM in buffer + * + * Return: true if there is enough space for another OGM, false otherwise. + */ +static bool +batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len, + const struct batadv_ogm_packet *ogm_packet) +{ + int next_buff_pos = 0; + + /* check if there is enough space for the header */ + next_buff_pos += buff_pos + sizeof(*ogm_packet); + if (next_buff_pos > packet_len) + return false; + + /* check if there is enough space for the optional TVLV */ + next_buff_pos += ntohs(ogm_packet->tvlv_len); + + return (next_buff_pos <= packet_len) && + (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); +} + +/* send a batman ogm to a given interface */ +static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet, + struct batadv_hard_iface *hard_iface) +{ + struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); + const char *fwd_str; + u8 packet_num; + s16 buff_pos; + struct batadv_ogm_packet *batadv_ogm_packet; + struct sk_buff *skb; + u8 *packet_pos; + + if (hard_iface->if_status != BATADV_IF_ACTIVE) + return; + + packet_num = 0; + buff_pos = 0; + packet_pos = forw_packet->skb->data; + batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; + + /* adjust all flags and log packets */ + while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len, + batadv_ogm_packet)) { + /* we might have aggregated direct link packets with an + * ordinary base packet + */ + if (forw_packet->direct_link_flags & BIT(packet_num) && + forw_packet->if_incoming == hard_iface) + batadv_ogm_packet->flags |= BATADV_DIRECTLINK; + else + batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; + + if (packet_num > 0 || !forw_packet->own) + fwd_str = "Forwarding"; + else + fwd_str = "Sending own"; + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n", + fwd_str, (packet_num > 0 ? "aggregated " : ""), + batadv_ogm_packet->orig, + ntohl(batadv_ogm_packet->seqno), + batadv_ogm_packet->tq, batadv_ogm_packet->ttl, + ((batadv_ogm_packet->flags & BATADV_DIRECTLINK) ? + "on" : "off"), + hard_iface->net_dev->name, + hard_iface->net_dev->dev_addr); + + buff_pos += BATADV_OGM_HLEN; + buff_pos += ntohs(batadv_ogm_packet->tvlv_len); + packet_num++; + packet_pos = forw_packet->skb->data + buff_pos; + batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; + } + + /* create clone because function is called more than once */ + skb = skb_clone(forw_packet->skb, GFP_ATOMIC); + if (skb) { + batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); + batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, + skb->len + ETH_HLEN); + batadv_send_broadcast_skb(skb, hard_iface); + } +} + +/* send a batman ogm packet */ +static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet) +{ + struct net_device *soft_iface; + + if (!forw_packet->if_incoming) { + pr_err("Error - can't forward packet: incoming iface not specified\n"); + return; + } + + soft_iface = forw_packet->if_incoming->soft_iface; + + if (WARN_ON(!forw_packet->if_outgoing)) + return; + + if (forw_packet->if_outgoing->soft_iface != soft_iface) { + pr_warn("%s: soft interface switch for queued OGM\n", __func__); + return; + } + + if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE) + return; + + /* only for one specific outgoing interface */ + batadv_iv_ogm_send_to_if(forw_packet, forw_packet->if_outgoing); +} + +/** + * batadv_iv_ogm_can_aggregate() - find out if an OGM can be aggregated on an + * existing forward packet + * @new_bat_ogm_packet: OGM packet to be aggregated + * @bat_priv: the bat priv with all the soft interface information + * @packet_len: (total) length of the OGM + * @send_time: timestamp (jiffies) when the packet is to be sent + * @directlink: true if this is a direct link packet + * @if_incoming: interface where the packet was received + * @if_outgoing: interface for which the retransmission should be considered + * @forw_packet: the forwarded packet which should be checked + * + * Return: true if new_packet can be aggregated with forw_packet + */ +static bool +batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet, + struct batadv_priv *bat_priv, + int packet_len, unsigned long send_time, + bool directlink, + const struct batadv_hard_iface *if_incoming, + const struct batadv_hard_iface *if_outgoing, + const struct batadv_forw_packet *forw_packet) +{ + struct batadv_ogm_packet *batadv_ogm_packet; + int aggregated_bytes = forw_packet->packet_len + packet_len; + struct batadv_hard_iface *primary_if = NULL; + bool res = false; + unsigned long aggregation_end_time; + + batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data; + aggregation_end_time = send_time; + aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); + + /* we can aggregate the current packet to this aggregated packet + * if: + * + * - the send time is within our MAX_AGGREGATION_MS time + * - the resulting packet won't be bigger than + * MAX_AGGREGATION_BYTES + * otherwise aggregation is not possible + */ + if (!time_before(send_time, forw_packet->send_time) || + !time_after_eq(aggregation_end_time, forw_packet->send_time)) + return false; + + if (aggregated_bytes > BATADV_MAX_AGGREGATION_BYTES) + return false; + + /* packet is not leaving on the same interface. */ + if (forw_packet->if_outgoing != if_outgoing) + return false; + + /* check aggregation compatibility + * -> direct link packets are broadcasted on + * their interface only + * -> aggregate packet if the current packet is + * a "global" packet as well as the base + * packet + */ + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + return false; + + /* packets without direct link flag and high TTL + * are flooded through the net + */ + if (!directlink && + !(batadv_ogm_packet->flags & BATADV_DIRECTLINK) && + batadv_ogm_packet->ttl != 1 && + + /* own packets originating non-primary + * interfaces leave only that interface + */ + (!forw_packet->own || + forw_packet->if_incoming == primary_if)) { + res = true; + goto out; + } + + /* if the incoming packet is sent via this one + * interface only - we still can aggregate + */ + if (directlink && + new_bat_ogm_packet->ttl == 1 && + forw_packet->if_incoming == if_incoming && + + /* packets from direct neighbors or + * own secondary interface packets + * (= secondary interface packets in general) + */ + (batadv_ogm_packet->flags & BATADV_DIRECTLINK || + (forw_packet->own && + forw_packet->if_incoming != primary_if))) { + res = true; + goto out; + } + +out: + batadv_hardif_put(primary_if); + return res; +} + +/** + * batadv_iv_ogm_aggregate_new() - create a new aggregated packet and add this + * packet to it. + * @packet_buff: pointer to the OGM + * @packet_len: (total) length of the OGM + * @send_time: timestamp (jiffies) when the packet is to be sent + * @direct_link: whether this OGM has direct link status + * @if_incoming: interface where the packet was received + * @if_outgoing: interface for which the retransmission should be considered + * @own_packet: true if it is a self-generated ogm + */ +static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff, + int packet_len, unsigned long send_time, + bool direct_link, + struct batadv_hard_iface *if_incoming, + struct batadv_hard_iface *if_outgoing, + int own_packet) +{ + struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); + struct batadv_forw_packet *forw_packet_aggr; + struct sk_buff *skb; + unsigned char *skb_buff; + unsigned int skb_size; + atomic_t *queue_left = own_packet ? NULL : &bat_priv->batman_queue_left; + + if (atomic_read(&bat_priv->aggregated_ogms) && + packet_len < BATADV_MAX_AGGREGATION_BYTES) + skb_size = BATADV_MAX_AGGREGATION_BYTES; + else + skb_size = packet_len; + + skb_size += ETH_HLEN; + + skb = netdev_alloc_skb_ip_align(NULL, skb_size); + if (!skb) + return; + + forw_packet_aggr = batadv_forw_packet_alloc(if_incoming, if_outgoing, + queue_left, bat_priv, skb); + if (!forw_packet_aggr) { + kfree_skb(skb); + return; + } + + forw_packet_aggr->skb->priority = TC_PRIO_CONTROL; + skb_reserve(forw_packet_aggr->skb, ETH_HLEN); + + skb_buff = skb_put(forw_packet_aggr->skb, packet_len); + forw_packet_aggr->packet_len = packet_len; + memcpy(skb_buff, packet_buff, packet_len); + + forw_packet_aggr->own = own_packet; + forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS; + forw_packet_aggr->send_time = send_time; + + /* save packet direct link flag status */ + if (direct_link) + forw_packet_aggr->direct_link_flags |= 1; + + INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work, + batadv_iv_send_outstanding_bat_ogm_packet); + + batadv_forw_packet_ogmv1_queue(bat_priv, forw_packet_aggr, send_time); +} + +/* aggregate a new packet into the existing ogm packet */ +static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr, + const unsigned char *packet_buff, + int packet_len, bool direct_link) +{ + unsigned long new_direct_link_flag; + + skb_put_data(forw_packet_aggr->skb, packet_buff, packet_len); + forw_packet_aggr->packet_len += packet_len; + forw_packet_aggr->num_packets++; + + /* save packet direct link flag status */ + if (direct_link) { + new_direct_link_flag = BIT(forw_packet_aggr->num_packets); + forw_packet_aggr->direct_link_flags |= new_direct_link_flag; + } +} + +/** + * batadv_iv_ogm_queue_add() - queue up an OGM for transmission + * @bat_priv: the bat priv with all the soft interface information + * @packet_buff: pointer to the OGM + * @packet_len: (total) length of the OGM + * @if_incoming: interface where the packet was received + * @if_outgoing: interface for which the retransmission should be considered + * @own_packet: true if it is a self-generated ogm + * @send_time: timestamp (jiffies) when the packet is to be sent + */ +static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv, + unsigned char *packet_buff, + int packet_len, + struct batadv_hard_iface *if_incoming, + struct batadv_hard_iface *if_outgoing, + int own_packet, unsigned long send_time) +{ + /* _aggr -> pointer to the packet we want to aggregate with + * _pos -> pointer to the position in the queue + */ + struct batadv_forw_packet *forw_packet_aggr = NULL; + struct batadv_forw_packet *forw_packet_pos = NULL; + struct batadv_ogm_packet *batadv_ogm_packet; + bool direct_link; + unsigned long max_aggregation_jiffies; + + batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff; + direct_link = !!(batadv_ogm_packet->flags & BATADV_DIRECTLINK); + max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); + + /* find position for the packet in the forward queue */ + spin_lock_bh(&bat_priv->forw_bat_list_lock); + /* own packets are not to be aggregated */ + if (atomic_read(&bat_priv->aggregated_ogms) && !own_packet) { + hlist_for_each_entry(forw_packet_pos, + &bat_priv->forw_bat_list, list) { + if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet, + bat_priv, packet_len, + send_time, direct_link, + if_incoming, + if_outgoing, + forw_packet_pos)) { + forw_packet_aggr = forw_packet_pos; + break; + } + } + } + + /* nothing to aggregate with - either aggregation disabled or no + * suitable aggregation packet found + */ + if (!forw_packet_aggr) { + /* the following section can run without the lock */ + spin_unlock_bh(&bat_priv->forw_bat_list_lock); + + /* if we could not aggregate this packet with one of the others + * we hold it back for a while, so that it might be aggregated + * later on + */ + if (!own_packet && atomic_read(&bat_priv->aggregated_ogms)) + send_time += max_aggregation_jiffies; + + batadv_iv_ogm_aggregate_new(packet_buff, packet_len, + send_time, direct_link, + if_incoming, if_outgoing, + own_packet); + } else { + batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff, + packet_len, direct_link); + spin_unlock_bh(&bat_priv->forw_bat_list_lock); + } +} + +static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node, + const struct ethhdr *ethhdr, + struct batadv_ogm_packet *batadv_ogm_packet, + bool is_single_hop_neigh, + bool is_from_best_next_hop, + struct batadv_hard_iface *if_incoming, + struct batadv_hard_iface *if_outgoing) +{ + struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); + u16 tvlv_len; + + if (batadv_ogm_packet->ttl <= 1) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n"); + return; + } + + if (!is_from_best_next_hop) { + /* Mark the forwarded packet when it is not coming from our + * best next hop. We still need to forward the packet for our + * neighbor link quality detection to work in case the packet + * originated from a single hop neighbor. Otherwise we can + * simply drop the ogm. + */ + if (is_single_hop_neigh) + batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP; + else + return; + } + + tvlv_len = ntohs(batadv_ogm_packet->tvlv_len); + + batadv_ogm_packet->ttl--; + ether_addr_copy(batadv_ogm_packet->prev_sender, ethhdr->h_source); + + /* apply hop penalty */ + batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq, + bat_priv); + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Forwarding packet: tq: %i, ttl: %i\n", + batadv_ogm_packet->tq, batadv_ogm_packet->ttl); + + if (is_single_hop_neigh) + batadv_ogm_packet->flags |= BATADV_DIRECTLINK; + else + batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; + + batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet, + BATADV_OGM_HLEN + tvlv_len, + if_incoming, if_outgoing, 0, + batadv_iv_ogm_fwd_send_time()); +} + +/** + * batadv_iv_ogm_slide_own_bcast_window() - bitshift own OGM broadcast windows + * for the given interface + * @hard_iface: the interface for which the windows have to be shifted + */ +static void +batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface) +{ + struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); + struct batadv_hashtable *hash = bat_priv->orig_hash; + struct hlist_head *head; + struct batadv_orig_node *orig_node; + struct batadv_orig_ifinfo *orig_ifinfo; + unsigned long *word; + u32 i; + u8 *w; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + rcu_read_lock(); + hlist_for_each_entry_rcu(orig_node, head, hash_entry) { + hlist_for_each_entry_rcu(orig_ifinfo, + &orig_node->ifinfo_list, + list) { + if (orig_ifinfo->if_outgoing != hard_iface) + continue; + + spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); + word = orig_ifinfo->bat_iv.bcast_own; + batadv_bit_get_packet(bat_priv, word, 1, 0); + w = &orig_ifinfo->bat_iv.bcast_own_sum; + *w = bitmap_weight(word, + BATADV_TQ_LOCAL_WINDOW_SIZE); + spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); + } + } + rcu_read_unlock(); + } +} + +/** + * batadv_iv_ogm_schedule_buff() - schedule submission of hardif ogm buffer + * @hard_iface: interface whose ogm buffer should be transmitted + */ +static void batadv_iv_ogm_schedule_buff(struct batadv_hard_iface *hard_iface) +{ + struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); + unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff; + struct batadv_ogm_packet *batadv_ogm_packet; + struct batadv_hard_iface *primary_if, *tmp_hard_iface; + int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len; + u32 seqno; + u16 tvlv_len = 0; + unsigned long send_time; + + lockdep_assert_held(&hard_iface->bat_iv.ogm_buff_mutex); + + /* interface already disabled by batadv_iv_ogm_iface_disable */ + if (!*ogm_buff) + return; + + /* the interface gets activated here to avoid race conditions between + * the moment of activating the interface in + * hardif_activate_interface() where the originator mac is set and + * outdated packets (especially uninitialized mac addresses) in the + * packet queue + */ + if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED) + hard_iface->if_status = BATADV_IF_ACTIVE; + + primary_if = batadv_primary_if_get_selected(bat_priv); + + if (hard_iface == primary_if) { + /* tt changes have to be committed before the tvlv data is + * appended as it may alter the tt tvlv container + */ + batadv_tt_local_commit_changes(bat_priv); + tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff, + ogm_buff_len, + BATADV_OGM_HLEN); + } + + batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff); + batadv_ogm_packet->tvlv_len = htons(tvlv_len); + + /* change sequence number to network order */ + seqno = (u32)atomic_read(&hard_iface->bat_iv.ogm_seqno); + batadv_ogm_packet->seqno = htonl(seqno); + atomic_inc(&hard_iface->bat_iv.ogm_seqno); + + batadv_iv_ogm_slide_own_bcast_window(hard_iface); + + send_time = batadv_iv_ogm_emit_send_time(bat_priv); + + if (hard_iface != primary_if) { + /* OGMs from secondary interfaces are only scheduled on their + * respective interfaces. + */ + batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, *ogm_buff_len, + hard_iface, hard_iface, 1, send_time); + goto out; + } + + /* OGMs from primary interfaces are scheduled on all + * interfaces. + */ + rcu_read_lock(); + list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) { + if (tmp_hard_iface->soft_iface != hard_iface->soft_iface) + continue; + + if (!kref_get_unless_zero(&tmp_hard_iface->refcount)) + continue; + + batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, + *ogm_buff_len, hard_iface, + tmp_hard_iface, 1, send_time); + + batadv_hardif_put(tmp_hard_iface); + } + rcu_read_unlock(); + +out: + batadv_hardif_put(primary_if); +} + +static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface) +{ + if (hard_iface->if_status == BATADV_IF_NOT_IN_USE || + hard_iface->if_status == BATADV_IF_TO_BE_REMOVED) + return; + + mutex_lock(&hard_iface->bat_iv.ogm_buff_mutex); + batadv_iv_ogm_schedule_buff(hard_iface); + mutex_unlock(&hard_iface->bat_iv.ogm_buff_mutex); +} + +/** + * batadv_iv_orig_ifinfo_sum() - Get bcast_own sum for originator over interface + * @orig_node: originator which reproadcasted the OGMs directly + * @if_outgoing: interface which transmitted the original OGM and received the + * direct rebroadcast + * + * Return: Number of replied (rebroadcasted) OGMs which were transmitted by + * an originator and directly (without intermediate hop) received by a specific + * interface + */ +static u8 batadv_iv_orig_ifinfo_sum(struct batadv_orig_node *orig_node, + struct batadv_hard_iface *if_outgoing) +{ + struct batadv_orig_ifinfo *orig_ifinfo; + u8 sum; + + orig_ifinfo = batadv_orig_ifinfo_get(orig_node, if_outgoing); + if (!orig_ifinfo) + return 0; + + spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); + sum = orig_ifinfo->bat_iv.bcast_own_sum; + spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); + + batadv_orig_ifinfo_put(orig_ifinfo); + + return sum; +} + +/** + * batadv_iv_ogm_orig_update() - use OGM to update corresponding data in an + * originator + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: the orig node who originally emitted the ogm packet + * @orig_ifinfo: ifinfo for the outgoing interface of the orig_node + * @ethhdr: Ethernet header of the OGM + * @batadv_ogm_packet: the ogm packet + * @if_incoming: interface where the packet was received + * @if_outgoing: interface for which the retransmission should be considered + * @dup_status: the duplicate status of this ogm packet. + */ +static void +batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + struct batadv_orig_ifinfo *orig_ifinfo, + const struct ethhdr *ethhdr, + const struct batadv_ogm_packet *batadv_ogm_packet, + struct batadv_hard_iface *if_incoming, + struct batadv_hard_iface *if_outgoing, + enum batadv_dup_status dup_status) +{ + struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; + struct batadv_neigh_ifinfo *router_ifinfo = NULL; + struct batadv_neigh_node *neigh_node = NULL; + struct batadv_neigh_node *tmp_neigh_node = NULL; + struct batadv_neigh_node *router = NULL; + u8 sum_orig, sum_neigh; + u8 *neigh_addr; + u8 tq_avg; + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "%s(): Searching and updating originator entry of received packet\n", + __func__); + + rcu_read_lock(); + hlist_for_each_entry_rcu(tmp_neigh_node, + &orig_node->neigh_list, list) { + neigh_addr = tmp_neigh_node->addr; + if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && + tmp_neigh_node->if_incoming == if_incoming && + kref_get_unless_zero(&tmp_neigh_node->refcount)) { + if (WARN(neigh_node, "too many matching neigh_nodes")) + batadv_neigh_node_put(neigh_node); + neigh_node = tmp_neigh_node; + continue; + } + + if (dup_status != BATADV_NO_DUP) + continue; + + /* only update the entry for this outgoing interface */ + neigh_ifinfo = batadv_neigh_ifinfo_get(tmp_neigh_node, + if_outgoing); + if (!neigh_ifinfo) + continue; + + spin_lock_bh(&tmp_neigh_node->ifinfo_lock); + batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv, + &neigh_ifinfo->bat_iv.tq_index, 0); + tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv); + neigh_ifinfo->bat_iv.tq_avg = tq_avg; + spin_unlock_bh(&tmp_neigh_node->ifinfo_lock); + + batadv_neigh_ifinfo_put(neigh_ifinfo); + neigh_ifinfo = NULL; + } + + if (!neigh_node) { + struct batadv_orig_node *orig_tmp; + + orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source); + if (!orig_tmp) + goto unlock; + + neigh_node = batadv_iv_ogm_neigh_new(if_incoming, + ethhdr->h_source, + orig_node, orig_tmp); + + batadv_orig_node_put(orig_tmp); + if (!neigh_node) + goto unlock; + } else { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Updating existing last-hop neighbor of originator\n"); + } + + rcu_read_unlock(); + neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); + if (!neigh_ifinfo) + goto out; + + neigh_node->last_seen = jiffies; + + spin_lock_bh(&neigh_node->ifinfo_lock); + batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv, + &neigh_ifinfo->bat_iv.tq_index, + batadv_ogm_packet->tq); + tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv); + neigh_ifinfo->bat_iv.tq_avg = tq_avg; + spin_unlock_bh(&neigh_node->ifinfo_lock); + + if (dup_status == BATADV_NO_DUP) { + orig_ifinfo->last_ttl = batadv_ogm_packet->ttl; + neigh_ifinfo->last_ttl = batadv_ogm_packet->ttl; + } + + /* if this neighbor already is our next hop there is nothing + * to change + */ + router = batadv_orig_router_get(orig_node, if_outgoing); + if (router == neigh_node) + goto out; + + if (router) { + router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); + if (!router_ifinfo) + goto out; + + /* if this neighbor does not offer a better TQ we won't + * consider it + */ + if (router_ifinfo->bat_iv.tq_avg > neigh_ifinfo->bat_iv.tq_avg) + goto out; + } + + /* if the TQ is the same and the link not more symmetric we + * won't consider it either + */ + if (router_ifinfo && + neigh_ifinfo->bat_iv.tq_avg == router_ifinfo->bat_iv.tq_avg) { + sum_orig = batadv_iv_orig_ifinfo_sum(router->orig_node, + router->if_incoming); + sum_neigh = batadv_iv_orig_ifinfo_sum(neigh_node->orig_node, + neigh_node->if_incoming); + if (sum_orig >= sum_neigh) + goto out; + } + + batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node); + goto out; + +unlock: + rcu_read_unlock(); +out: + batadv_neigh_node_put(neigh_node); + batadv_neigh_node_put(router); + batadv_neigh_ifinfo_put(neigh_ifinfo); + batadv_neigh_ifinfo_put(router_ifinfo); +} + +/** + * batadv_iv_ogm_calc_tq() - calculate tq for current received ogm packet + * @orig_node: the orig node who originally emitted the ogm packet + * @orig_neigh_node: the orig node struct of the neighbor who sent the packet + * @batadv_ogm_packet: the ogm packet + * @if_incoming: interface where the packet was received + * @if_outgoing: interface for which the retransmission should be considered + * + * Return: true if the link can be considered bidirectional, false otherwise + */ +static bool batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, + struct batadv_orig_node *orig_neigh_node, + struct batadv_ogm_packet *batadv_ogm_packet, + struct batadv_hard_iface *if_incoming, + struct batadv_hard_iface *if_outgoing) +{ + struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); + struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node; + struct batadv_neigh_ifinfo *neigh_ifinfo; + u8 total_count; + u8 orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own; + unsigned int tq_iface_hop_penalty = BATADV_TQ_MAX_VALUE; + unsigned int neigh_rq_inv_cube, neigh_rq_max_cube; + unsigned int tq_asym_penalty, inv_asym_penalty; + unsigned int combined_tq; + bool ret = false; + + /* find corresponding one hop neighbor */ + rcu_read_lock(); + hlist_for_each_entry_rcu(tmp_neigh_node, + &orig_neigh_node->neigh_list, list) { + if (!batadv_compare_eth(tmp_neigh_node->addr, + orig_neigh_node->orig)) + continue; + + if (tmp_neigh_node->if_incoming != if_incoming) + continue; + + if (!kref_get_unless_zero(&tmp_neigh_node->refcount)) + continue; + + neigh_node = tmp_neigh_node; + break; + } + rcu_read_unlock(); + + if (!neigh_node) + neigh_node = batadv_iv_ogm_neigh_new(if_incoming, + orig_neigh_node->orig, + orig_neigh_node, + orig_neigh_node); + + if (!neigh_node) + goto out; + + /* if orig_node is direct neighbor update neigh_node last_seen */ + if (orig_node == orig_neigh_node) + neigh_node->last_seen = jiffies; + + orig_node->last_seen = jiffies; + + /* find packet count of corresponding one hop neighbor */ + orig_eq_count = batadv_iv_orig_ifinfo_sum(orig_neigh_node, if_incoming); + neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); + if (neigh_ifinfo) { + neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count; + batadv_neigh_ifinfo_put(neigh_ifinfo); + } else { + neigh_rq_count = 0; + } + + /* pay attention to not get a value bigger than 100 % */ + if (orig_eq_count > neigh_rq_count) + total_count = neigh_rq_count; + else + total_count = orig_eq_count; + + /* if we have too few packets (too less data) we set tq_own to zero + * if we receive too few packets it is not considered bidirectional + */ + if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM || + neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM) + tq_own = 0; + else + /* neigh_node->real_packet_count is never zero as we + * only purge old information when getting new + * information + */ + tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count; + + /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does + * affect the nearly-symmetric links only a little, but + * punishes asymmetric links more. This will give a value + * between 0 and TQ_MAX_VALUE + */ + neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count; + neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv; + neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE * + BATADV_TQ_LOCAL_WINDOW_SIZE * + BATADV_TQ_LOCAL_WINDOW_SIZE; + inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube; + inv_asym_penalty /= neigh_rq_max_cube; + tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty; + tq_iface_hop_penalty -= atomic_read(&if_incoming->hop_penalty); + + /* penalize if the OGM is forwarded on the same interface. WiFi + * interfaces and other half duplex devices suffer from throughput + * drops as they can't send and receive at the same time. + */ + if (if_outgoing && if_incoming == if_outgoing && + batadv_is_wifi_hardif(if_outgoing)) + tq_iface_hop_penalty = batadv_hop_penalty(tq_iface_hop_penalty, + bat_priv); + + combined_tq = batadv_ogm_packet->tq * + tq_own * + tq_asym_penalty * + tq_iface_hop_penalty; + combined_tq /= BATADV_TQ_MAX_VALUE * + BATADV_TQ_MAX_VALUE * + BATADV_TQ_MAX_VALUE; + batadv_ogm_packet->tq = combined_tq; + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "bidirectional: orig = %pM neigh = %pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, iface_hop_penalty: %3i, total tq: %3i, if_incoming = %s, if_outgoing = %s\n", + orig_node->orig, orig_neigh_node->orig, total_count, + neigh_rq_count, tq_own, tq_asym_penalty, + tq_iface_hop_penalty, batadv_ogm_packet->tq, + if_incoming->net_dev->name, + if_outgoing ? if_outgoing->net_dev->name : "DEFAULT"); + + /* if link has the minimum required transmission quality + * consider it bidirectional + */ + if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT) + ret = true; + +out: + batadv_neigh_node_put(neigh_node); + return ret; +} + +/** + * batadv_iv_ogm_update_seqnos() - process a batman packet for all interfaces, + * adjust the sequence number and find out whether it is a duplicate + * @ethhdr: ethernet header of the packet + * @batadv_ogm_packet: OGM packet to be considered + * @if_incoming: interface on which the OGM packet was received + * @if_outgoing: interface for which the retransmission should be considered + * + * Return: duplicate status as enum batadv_dup_status + */ +static enum batadv_dup_status +batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, + const struct batadv_ogm_packet *batadv_ogm_packet, + const struct batadv_hard_iface *if_incoming, + struct batadv_hard_iface *if_outgoing) +{ + struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); + struct batadv_orig_node *orig_node; + struct batadv_orig_ifinfo *orig_ifinfo = NULL; + struct batadv_neigh_node *neigh_node; + struct batadv_neigh_ifinfo *neigh_ifinfo; + bool is_dup; + s32 seq_diff; + bool need_update = false; + int set_mark; + enum batadv_dup_status ret = BATADV_NO_DUP; + u32 seqno = ntohl(batadv_ogm_packet->seqno); + u8 *neigh_addr; + u8 packet_count; + unsigned long *bitmap; + + orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig); + if (!orig_node) + return BATADV_NO_DUP; + + orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); + if (WARN_ON(!orig_ifinfo)) { + batadv_orig_node_put(orig_node); + return 0; + } + + spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); + seq_diff = seqno - orig_ifinfo->last_real_seqno; + + /* signalize caller that the packet is to be dropped. */ + if (!hlist_empty(&orig_node->neigh_list) && + batadv_window_protected(bat_priv, seq_diff, + BATADV_TQ_LOCAL_WINDOW_SIZE, + &orig_ifinfo->batman_seqno_reset, NULL)) { + ret = BATADV_PROTECTED; + goto out; + } + + rcu_read_lock(); + hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) { + neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, + if_outgoing); + if (!neigh_ifinfo) + continue; + + neigh_addr = neigh_node->addr; + is_dup = batadv_test_bit(neigh_ifinfo->bat_iv.real_bits, + orig_ifinfo->last_real_seqno, + seqno); + + if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && + neigh_node->if_incoming == if_incoming) { + set_mark = 1; + if (is_dup) + ret = BATADV_NEIGH_DUP; + } else { + set_mark = 0; + if (is_dup && ret != BATADV_NEIGH_DUP) + ret = BATADV_ORIG_DUP; + } + + /* if the window moved, set the update flag. */ + bitmap = neigh_ifinfo->bat_iv.real_bits; + need_update |= batadv_bit_get_packet(bat_priv, bitmap, + seq_diff, set_mark); + + packet_count = bitmap_weight(bitmap, + BATADV_TQ_LOCAL_WINDOW_SIZE); + neigh_ifinfo->bat_iv.real_packet_count = packet_count; + batadv_neigh_ifinfo_put(neigh_ifinfo); + } + rcu_read_unlock(); + + if (need_update) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "%s updating last_seqno: old %u, new %u\n", + if_outgoing ? if_outgoing->net_dev->name : "DEFAULT", + orig_ifinfo->last_real_seqno, seqno); + orig_ifinfo->last_real_seqno = seqno; + } + +out: + spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); + batadv_orig_node_put(orig_node); + batadv_orig_ifinfo_put(orig_ifinfo); + return ret; +} + +/** + * batadv_iv_ogm_process_per_outif() - process a batman iv OGM for an outgoing + * interface + * @skb: the skb containing the OGM + * @ogm_offset: offset from skb->data to start of ogm header + * @orig_node: the (cached) orig node for the originator of this OGM + * @if_incoming: the interface where this packet was received + * @if_outgoing: the interface for which the packet should be considered + */ +static void +batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset, + struct batadv_orig_node *orig_node, + struct batadv_hard_iface *if_incoming, + struct batadv_hard_iface *if_outgoing) +{ + struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); + struct batadv_hardif_neigh_node *hardif_neigh = NULL; + struct batadv_neigh_node *router = NULL; + struct batadv_neigh_node *router_router = NULL; + struct batadv_orig_node *orig_neigh_node; + struct batadv_orig_ifinfo *orig_ifinfo; + struct batadv_neigh_node *orig_neigh_router = NULL; + struct batadv_neigh_ifinfo *router_ifinfo = NULL; + struct batadv_ogm_packet *ogm_packet; + enum batadv_dup_status dup_status; + bool is_from_best_next_hop = false; + bool is_single_hop_neigh = false; + bool sameseq, similar_ttl; + struct sk_buff *skb_priv; + struct ethhdr *ethhdr; + u8 *prev_sender; + bool is_bidirect; + + /* create a private copy of the skb, as some functions change tq value + * and/or flags. + */ + skb_priv = skb_copy(skb, GFP_ATOMIC); + if (!skb_priv) + return; + + ethhdr = eth_hdr(skb_priv); + ogm_packet = (struct batadv_ogm_packet *)(skb_priv->data + ogm_offset); + + dup_status = batadv_iv_ogm_update_seqnos(ethhdr, ogm_packet, + if_incoming, if_outgoing); + if (batadv_compare_eth(ethhdr->h_source, ogm_packet->orig)) + is_single_hop_neigh = true; + + if (dup_status == BATADV_PROTECTED) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Drop packet: packet within seqno protection time (sender: %pM)\n", + ethhdr->h_source); + goto out; + } + + if (ogm_packet->tq == 0) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Drop packet: originator packet with tq equal 0\n"); + goto out; + } + + if (is_single_hop_neigh) { + hardif_neigh = batadv_hardif_neigh_get(if_incoming, + ethhdr->h_source); + if (hardif_neigh) + hardif_neigh->last_seen = jiffies; + } + + router = batadv_orig_router_get(orig_node, if_outgoing); + if (router) { + router_router = batadv_orig_router_get(router->orig_node, + if_outgoing); + router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); + } + + if ((router_ifinfo && router_ifinfo->bat_iv.tq_avg != 0) && + (batadv_compare_eth(router->addr, ethhdr->h_source))) + is_from_best_next_hop = true; + + prev_sender = ogm_packet->prev_sender; + /* avoid temporary routing loops */ + if (router && router_router && + (batadv_compare_eth(router->addr, prev_sender)) && + !(batadv_compare_eth(ogm_packet->orig, prev_sender)) && + (batadv_compare_eth(router->addr, router_router->addr))) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n", + ethhdr->h_source); + goto out; + } + + if (if_outgoing == BATADV_IF_DEFAULT) + batadv_tvlv_ogm_receive(bat_priv, ogm_packet, orig_node); + + /* if sender is a direct neighbor the sender mac equals + * originator mac + */ + if (is_single_hop_neigh) + orig_neigh_node = orig_node; + else + orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv, + ethhdr->h_source); + + if (!orig_neigh_node) + goto out; + + /* Update nc_nodes of the originator */ + batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node, + ogm_packet, is_single_hop_neigh); + + orig_neigh_router = batadv_orig_router_get(orig_neigh_node, + if_outgoing); + + /* drop packet if sender is not a direct neighbor and if we + * don't route towards it + */ + if (!is_single_hop_neigh && !orig_neigh_router) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Drop packet: OGM via unknown neighbor!\n"); + goto out_neigh; + } + + is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node, + ogm_packet, if_incoming, + if_outgoing); + + /* update ranking if it is not a duplicate or has the same + * seqno and similar ttl as the non-duplicate + */ + orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); + if (!orig_ifinfo) + goto out_neigh; + + sameseq = orig_ifinfo->last_real_seqno == ntohl(ogm_packet->seqno); + similar_ttl = (orig_ifinfo->last_ttl - 3) <= ogm_packet->ttl; + + if (is_bidirect && (dup_status == BATADV_NO_DUP || + (sameseq && similar_ttl))) { + batadv_iv_ogm_orig_update(bat_priv, orig_node, + orig_ifinfo, ethhdr, + ogm_packet, if_incoming, + if_outgoing, dup_status); + } + batadv_orig_ifinfo_put(orig_ifinfo); + + /* only forward for specific interface, not for the default one. */ + if (if_outgoing == BATADV_IF_DEFAULT) + goto out_neigh; + + /* is single hop (direct) neighbor */ + if (is_single_hop_neigh) { + /* OGMs from secondary interfaces should only scheduled once + * per interface where it has been received, not multiple times + */ + if (ogm_packet->ttl <= 2 && + if_incoming != if_outgoing) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Drop packet: OGM from secondary interface and wrong outgoing interface\n"); + goto out_neigh; + } + /* mark direct link on incoming interface */ + batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet, + is_single_hop_neigh, + is_from_best_next_hop, if_incoming, + if_outgoing); + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Forwarding packet: rebroadcast neighbor packet with direct link flag\n"); + goto out_neigh; + } + + /* multihop originator */ + if (!is_bidirect) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Drop packet: not received via bidirectional link\n"); + goto out_neigh; + } + + if (dup_status == BATADV_NEIGH_DUP) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Drop packet: duplicate packet received\n"); + goto out_neigh; + } + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Forwarding packet: rebroadcast originator packet\n"); + batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet, + is_single_hop_neigh, is_from_best_next_hop, + if_incoming, if_outgoing); + +out_neigh: + if (orig_neigh_node && !is_single_hop_neigh) + batadv_orig_node_put(orig_neigh_node); +out: + batadv_neigh_ifinfo_put(router_ifinfo); + batadv_neigh_node_put(router); + batadv_neigh_node_put(router_router); + batadv_neigh_node_put(orig_neigh_router); + batadv_hardif_neigh_put(hardif_neigh); + + consume_skb(skb_priv); +} + +/** + * batadv_iv_ogm_process_reply() - Check OGM for direct reply and process it + * @ogm_packet: rebroadcast OGM packet to process + * @if_incoming: the interface where this packet was received + * @orig_node: originator which reproadcasted the OGMs + * @if_incoming_seqno: OGM sequence number when rebroadcast was received + */ +static void batadv_iv_ogm_process_reply(struct batadv_ogm_packet *ogm_packet, + struct batadv_hard_iface *if_incoming, + struct batadv_orig_node *orig_node, + u32 if_incoming_seqno) +{ + struct batadv_orig_ifinfo *orig_ifinfo; + s32 bit_pos; + u8 *weight; + + /* neighbor has to indicate direct link and it has to + * come via the corresponding interface + */ + if (!(ogm_packet->flags & BATADV_DIRECTLINK)) + return; + + if (!batadv_compare_eth(if_incoming->net_dev->dev_addr, + ogm_packet->orig)) + return; + + orig_ifinfo = batadv_orig_ifinfo_get(orig_node, if_incoming); + if (!orig_ifinfo) + return; + + /* save packet seqno for bidirectional check */ + spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); + bit_pos = if_incoming_seqno - 2; + bit_pos -= ntohl(ogm_packet->seqno); + batadv_set_bit(orig_ifinfo->bat_iv.bcast_own, bit_pos); + weight = &orig_ifinfo->bat_iv.bcast_own_sum; + *weight = bitmap_weight(orig_ifinfo->bat_iv.bcast_own, + BATADV_TQ_LOCAL_WINDOW_SIZE); + spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); + + batadv_orig_ifinfo_put(orig_ifinfo); +} + +/** + * batadv_iv_ogm_process() - process an incoming batman iv OGM + * @skb: the skb containing the OGM + * @ogm_offset: offset to the OGM which should be processed (for aggregates) + * @if_incoming: the interface where this packet was received + */ +static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset, + struct batadv_hard_iface *if_incoming) +{ + struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); + struct batadv_orig_node *orig_neigh_node, *orig_node; + struct batadv_hard_iface *hard_iface; + struct batadv_ogm_packet *ogm_packet; + u32 if_incoming_seqno; + bool has_directlink_flag; + struct ethhdr *ethhdr; + bool is_my_oldorig = false; + bool is_my_addr = false; + bool is_my_orig = false; + + ogm_packet = (struct batadv_ogm_packet *)(skb->data + ogm_offset); + ethhdr = eth_hdr(skb); + + /* Silently drop when the batman packet is actually not a + * correct packet. + * + * This might happen if a packet is padded (e.g. Ethernet has a + * minimum frame length of 64 byte) and the aggregation interprets + * it as an additional length. + * + * TODO: A more sane solution would be to have a bit in the + * batadv_ogm_packet to detect whether the packet is the last + * packet in an aggregation. Here we expect that the padding + * is always zero (or not 0x01) + */ + if (ogm_packet->packet_type != BATADV_IV_OGM) + return; + + /* could be changed by schedule_own_packet() */ + if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno); + + if (ogm_packet->flags & BATADV_DIRECTLINK) + has_directlink_flag = true; + else + has_directlink_flag = false; + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Received BATMAN packet via NB: %pM, IF: %s [%pM] (from OG: %pM, via prev OG: %pM, seqno %u, tq %d, TTL %d, V %d, IDF %d)\n", + ethhdr->h_source, if_incoming->net_dev->name, + if_incoming->net_dev->dev_addr, ogm_packet->orig, + ogm_packet->prev_sender, ntohl(ogm_packet->seqno), + ogm_packet->tq, ogm_packet->ttl, + ogm_packet->version, has_directlink_flag); + + rcu_read_lock(); + list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { + if (hard_iface->if_status != BATADV_IF_ACTIVE) + continue; + + if (hard_iface->soft_iface != if_incoming->soft_iface) + continue; + + if (batadv_compare_eth(ethhdr->h_source, + hard_iface->net_dev->dev_addr)) + is_my_addr = true; + + if (batadv_compare_eth(ogm_packet->orig, + hard_iface->net_dev->dev_addr)) + is_my_orig = true; + + if (batadv_compare_eth(ogm_packet->prev_sender, + hard_iface->net_dev->dev_addr)) + is_my_oldorig = true; + } + rcu_read_unlock(); + + if (is_my_addr) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Drop packet: received my own broadcast (sender: %pM)\n", + ethhdr->h_source); + return; + } + + if (is_my_orig) { + orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv, + ethhdr->h_source); + if (!orig_neigh_node) + return; + + batadv_iv_ogm_process_reply(ogm_packet, if_incoming, + orig_neigh_node, if_incoming_seqno); + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Drop packet: originator packet from myself (via neighbor)\n"); + batadv_orig_node_put(orig_neigh_node); + return; + } + + if (is_my_oldorig) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n", + ethhdr->h_source); + return; + } + + if (ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n", + ethhdr->h_source); + return; + } + + orig_node = batadv_iv_ogm_orig_get(bat_priv, ogm_packet->orig); + if (!orig_node) + return; + + batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node, + if_incoming, BATADV_IF_DEFAULT); + + rcu_read_lock(); + list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { + if (hard_iface->if_status != BATADV_IF_ACTIVE) + continue; + + if (hard_iface->soft_iface != bat_priv->soft_iface) + continue; + + if (!kref_get_unless_zero(&hard_iface->refcount)) + continue; + + batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node, + if_incoming, hard_iface); + + batadv_hardif_put(hard_iface); + } + rcu_read_unlock(); + + batadv_orig_node_put(orig_node); +} + +static void batadv_iv_send_outstanding_bat_ogm_packet(struct work_struct *work) +{ + struct delayed_work *delayed_work; + struct batadv_forw_packet *forw_packet; + struct batadv_priv *bat_priv; + bool dropped = false; + + delayed_work = to_delayed_work(work); + forw_packet = container_of(delayed_work, struct batadv_forw_packet, + delayed_work); + bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface); + + if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) { + dropped = true; + goto out; + } + + batadv_iv_ogm_emit(forw_packet); + + /* we have to have at least one packet in the queue to determine the + * queues wake up time unless we are shutting down. + * + * only re-schedule if this is the "original" copy, e.g. the OGM of the + * primary interface should only be rescheduled once per period, but + * this function will be called for the forw_packet instances of the + * other secondary interfaces as well. + */ + if (forw_packet->own && + forw_packet->if_incoming == forw_packet->if_outgoing) + batadv_iv_ogm_schedule(forw_packet->if_incoming); + +out: + /* do we get something for free()? */ + if (batadv_forw_packet_steal(forw_packet, + &bat_priv->forw_bat_list_lock)) + batadv_forw_packet_free(forw_packet, dropped); +} + +static int batadv_iv_ogm_receive(struct sk_buff *skb, + struct batadv_hard_iface *if_incoming) +{ + struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); + struct batadv_ogm_packet *ogm_packet; + u8 *packet_pos; + int ogm_offset; + bool res; + int ret = NET_RX_DROP; + + res = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN); + if (!res) + goto free_skb; + + /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface + * that does not have B.A.T.M.A.N. IV enabled ? + */ + if (bat_priv->algo_ops->iface.enable != batadv_iv_ogm_iface_enable) + goto free_skb; + + batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); + batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, + skb->len + ETH_HLEN); + + ogm_offset = 0; + ogm_packet = (struct batadv_ogm_packet *)skb->data; + + /* unpack the aggregated packets and process them one by one */ + while (batadv_iv_ogm_aggr_packet(ogm_offset, skb_headlen(skb), + ogm_packet)) { + batadv_iv_ogm_process(skb, ogm_offset, if_incoming); + + ogm_offset += BATADV_OGM_HLEN; + ogm_offset += ntohs(ogm_packet->tvlv_len); + + packet_pos = skb->data + ogm_offset; + ogm_packet = (struct batadv_ogm_packet *)packet_pos; + } + + ret = NET_RX_SUCCESS; + +free_skb: + if (ret == NET_RX_SUCCESS) + consume_skb(skb); + else + kfree_skb(skb); + + return ret; +} + +/** + * batadv_iv_ogm_neigh_get_tq_avg() - Get the TQ average for a neighbour on a + * given outgoing interface. + * @neigh_node: Neighbour of interest + * @if_outgoing: Outgoing interface of interest + * @tq_avg: Pointer of where to store the TQ average + * + * Return: False if no average TQ available, otherwise true. + */ +static bool +batadv_iv_ogm_neigh_get_tq_avg(struct batadv_neigh_node *neigh_node, + struct batadv_hard_iface *if_outgoing, + u8 *tq_avg) +{ + struct batadv_neigh_ifinfo *n_ifinfo; + + n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); + if (!n_ifinfo) + return false; + + *tq_avg = n_ifinfo->bat_iv.tq_avg; + batadv_neigh_ifinfo_put(n_ifinfo); + + return true; +} + +/** + * batadv_iv_ogm_orig_dump_subentry() - Dump an originator subentry into a + * message + * @msg: Netlink message to dump into + * @portid: Port making netlink request + * @seq: Sequence number of netlink message + * @bat_priv: The bat priv with all the soft interface information + * @if_outgoing: Limit dump to entries with this outgoing interface + * @orig_node: Originator to dump + * @neigh_node: Single hops neighbour + * @best: Is the best originator + * + * Return: Error code, or 0 on success + */ +static int +batadv_iv_ogm_orig_dump_subentry(struct sk_buff *msg, u32 portid, u32 seq, + struct batadv_priv *bat_priv, + struct batadv_hard_iface *if_outgoing, + struct batadv_orig_node *orig_node, + struct batadv_neigh_node *neigh_node, + bool best) +{ + void *hdr; + u8 tq_avg; + unsigned int last_seen_msecs; + + last_seen_msecs = jiffies_to_msecs(jiffies - orig_node->last_seen); + + if (!batadv_iv_ogm_neigh_get_tq_avg(neigh_node, if_outgoing, &tq_avg)) + return 0; + + if (if_outgoing != BATADV_IF_DEFAULT && + if_outgoing != neigh_node->if_incoming) + return 0; + + hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, + NLM_F_MULTI, BATADV_CMD_GET_ORIGINATORS); + if (!hdr) + return -ENOBUFS; + + if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, + orig_node->orig) || + nla_put(msg, BATADV_ATTR_NEIGH_ADDRESS, ETH_ALEN, + neigh_node->addr) || + nla_put_string(msg, BATADV_ATTR_HARD_IFNAME, + neigh_node->if_incoming->net_dev->name) || + nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX, + neigh_node->if_incoming->net_dev->ifindex) || + nla_put_u8(msg, BATADV_ATTR_TQ, tq_avg) || + nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, + last_seen_msecs)) + goto nla_put_failure; + + if (best && nla_put_flag(msg, BATADV_ATTR_FLAG_BEST)) + goto nla_put_failure; + + genlmsg_end(msg, hdr); + return 0; + + nla_put_failure: + genlmsg_cancel(msg, hdr); + return -EMSGSIZE; +} + +/** + * batadv_iv_ogm_orig_dump_entry() - Dump an originator entry into a message + * @msg: Netlink message to dump into + * @portid: Port making netlink request + * @seq: Sequence number of netlink message + * @bat_priv: The bat priv with all the soft interface information + * @if_outgoing: Limit dump to entries with this outgoing interface + * @orig_node: Originator to dump + * @sub_s: Number of sub entries to skip + * + * This function assumes the caller holds rcu_read_lock(). + * + * Return: Error code, or 0 on success + */ +static int +batadv_iv_ogm_orig_dump_entry(struct sk_buff *msg, u32 portid, u32 seq, + struct batadv_priv *bat_priv, + struct batadv_hard_iface *if_outgoing, + struct batadv_orig_node *orig_node, int *sub_s) +{ + struct batadv_neigh_node *neigh_node_best; + struct batadv_neigh_node *neigh_node; + int sub = 0; + bool best; + u8 tq_avg_best; + + neigh_node_best = batadv_orig_router_get(orig_node, if_outgoing); + if (!neigh_node_best) + goto out; + + if (!batadv_iv_ogm_neigh_get_tq_avg(neigh_node_best, if_outgoing, + &tq_avg_best)) + goto out; + + if (tq_avg_best == 0) + goto out; + + hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) { + if (sub++ < *sub_s) + continue; + + best = (neigh_node == neigh_node_best); + + if (batadv_iv_ogm_orig_dump_subentry(msg, portid, seq, + bat_priv, if_outgoing, + orig_node, neigh_node, + best)) { + batadv_neigh_node_put(neigh_node_best); + + *sub_s = sub - 1; + return -EMSGSIZE; + } + } + + out: + batadv_neigh_node_put(neigh_node_best); + + *sub_s = 0; + return 0; +} + +/** + * batadv_iv_ogm_orig_dump_bucket() - Dump an originator bucket into a + * message + * @msg: Netlink message to dump into + * @portid: Port making netlink request + * @seq: Sequence number of netlink message + * @bat_priv: The bat priv with all the soft interface information + * @if_outgoing: Limit dump to entries with this outgoing interface + * @head: Bucket to be dumped + * @idx_s: Number of entries to be skipped + * @sub: Number of sub entries to be skipped + * + * Return: Error code, or 0 on success + */ +static int +batadv_iv_ogm_orig_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq, + struct batadv_priv *bat_priv, + struct batadv_hard_iface *if_outgoing, + struct hlist_head *head, int *idx_s, int *sub) +{ + struct batadv_orig_node *orig_node; + int idx = 0; + + rcu_read_lock(); + hlist_for_each_entry_rcu(orig_node, head, hash_entry) { + if (idx++ < *idx_s) + continue; + + if (batadv_iv_ogm_orig_dump_entry(msg, portid, seq, bat_priv, + if_outgoing, orig_node, + sub)) { + rcu_read_unlock(); + *idx_s = idx - 1; + return -EMSGSIZE; + } + } + rcu_read_unlock(); + + *idx_s = 0; + *sub = 0; + return 0; +} + +/** + * batadv_iv_ogm_orig_dump() - Dump the originators into a message + * @msg: Netlink message to dump into + * @cb: Control block containing additional options + * @bat_priv: The bat priv with all the soft interface information + * @if_outgoing: Limit dump to entries with this outgoing interface + */ +static void +batadv_iv_ogm_orig_dump(struct sk_buff *msg, struct netlink_callback *cb, + struct batadv_priv *bat_priv, + struct batadv_hard_iface *if_outgoing) +{ + struct batadv_hashtable *hash = bat_priv->orig_hash; + struct hlist_head *head; + int bucket = cb->args[0]; + int idx = cb->args[1]; + int sub = cb->args[2]; + int portid = NETLINK_CB(cb->skb).portid; + + while (bucket < hash->size) { + head = &hash->table[bucket]; + + if (batadv_iv_ogm_orig_dump_bucket(msg, portid, + cb->nlh->nlmsg_seq, + bat_priv, if_outgoing, head, + &idx, &sub)) + break; + + bucket++; + } + + cb->args[0] = bucket; + cb->args[1] = idx; + cb->args[2] = sub; +} + +/** + * batadv_iv_ogm_neigh_diff() - calculate tq difference of two neighbors + * @neigh1: the first neighbor object of the comparison + * @if_outgoing1: outgoing interface for the first neighbor + * @neigh2: the second neighbor object of the comparison + * @if_outgoing2: outgoing interface for the second neighbor + * @diff: pointer to integer receiving the calculated difference + * + * The content of *@diff is only valid when this function returns true. + * It is less, equal to or greater than 0 if the metric via neigh1 is lower, + * the same as or higher than the metric via neigh2 + * + * Return: true when the difference could be calculated, false otherwise + */ +static bool batadv_iv_ogm_neigh_diff(struct batadv_neigh_node *neigh1, + struct batadv_hard_iface *if_outgoing1, + struct batadv_neigh_node *neigh2, + struct batadv_hard_iface *if_outgoing2, + int *diff) +{ + struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo; + u8 tq1, tq2; + bool ret = true; + + neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1); + neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2); + + if (!neigh1_ifinfo || !neigh2_ifinfo) { + ret = false; + goto out; + } + + tq1 = neigh1_ifinfo->bat_iv.tq_avg; + tq2 = neigh2_ifinfo->bat_iv.tq_avg; + *diff = (int)tq1 - (int)tq2; + +out: + batadv_neigh_ifinfo_put(neigh1_ifinfo); + batadv_neigh_ifinfo_put(neigh2_ifinfo); + + return ret; +} + +/** + * batadv_iv_ogm_neigh_dump_neigh() - Dump a neighbour into a netlink message + * @msg: Netlink message to dump into + * @portid: Port making netlink request + * @seq: Sequence number of netlink message + * @hardif_neigh: Neighbour to be dumped + * + * Return: Error code, or 0 on success + */ +static int +batadv_iv_ogm_neigh_dump_neigh(struct sk_buff *msg, u32 portid, u32 seq, + struct batadv_hardif_neigh_node *hardif_neigh) +{ + void *hdr; + unsigned int last_seen_msecs; + + last_seen_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen); + + hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, + NLM_F_MULTI, BATADV_CMD_GET_NEIGHBORS); + if (!hdr) + return -ENOBUFS; + + if (nla_put(msg, BATADV_ATTR_NEIGH_ADDRESS, ETH_ALEN, + hardif_neigh->addr) || + nla_put_string(msg, BATADV_ATTR_HARD_IFNAME, + hardif_neigh->if_incoming->net_dev->name) || + nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX, + hardif_neigh->if_incoming->net_dev->ifindex) || + nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, + last_seen_msecs)) + goto nla_put_failure; + + genlmsg_end(msg, hdr); + return 0; + + nla_put_failure: + genlmsg_cancel(msg, hdr); + return -EMSGSIZE; +} + +/** + * batadv_iv_ogm_neigh_dump_hardif() - Dump the neighbours of a hard interface + * into a message + * @msg: Netlink message to dump into + * @portid: Port making netlink request + * @seq: Sequence number of netlink message + * @bat_priv: The bat priv with all the soft interface information + * @hard_iface: Hard interface to dump the neighbours for + * @idx_s: Number of entries to skip + * + * This function assumes the caller holds rcu_read_lock(). + * + * Return: Error code, or 0 on success + */ +static int +batadv_iv_ogm_neigh_dump_hardif(struct sk_buff *msg, u32 portid, u32 seq, + struct batadv_priv *bat_priv, + struct batadv_hard_iface *hard_iface, + int *idx_s) +{ + struct batadv_hardif_neigh_node *hardif_neigh; + int idx = 0; + + hlist_for_each_entry_rcu(hardif_neigh, + &hard_iface->neigh_list, list) { + if (idx++ < *idx_s) + continue; + + if (batadv_iv_ogm_neigh_dump_neigh(msg, portid, seq, + hardif_neigh)) { + *idx_s = idx - 1; + return -EMSGSIZE; + } + } + + *idx_s = 0; + return 0; +} + +/** + * batadv_iv_ogm_neigh_dump() - Dump the neighbours into a message + * @msg: Netlink message to dump into + * @cb: Control block containing additional options + * @bat_priv: The bat priv with all the soft interface information + * @single_hardif: Limit dump to this hard interface + */ +static void +batadv_iv_ogm_neigh_dump(struct sk_buff *msg, struct netlink_callback *cb, + struct batadv_priv *bat_priv, + struct batadv_hard_iface *single_hardif) +{ + struct batadv_hard_iface *hard_iface; + int i_hardif = 0; + int i_hardif_s = cb->args[0]; + int idx = cb->args[1]; + int portid = NETLINK_CB(cb->skb).portid; + + rcu_read_lock(); + if (single_hardif) { + if (i_hardif_s == 0) { + if (batadv_iv_ogm_neigh_dump_hardif(msg, portid, + cb->nlh->nlmsg_seq, + bat_priv, + single_hardif, + &idx) == 0) + i_hardif++; + } + } else { + list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, + list) { + if (hard_iface->soft_iface != bat_priv->soft_iface) + continue; + + if (i_hardif++ < i_hardif_s) + continue; + + if (batadv_iv_ogm_neigh_dump_hardif(msg, portid, + cb->nlh->nlmsg_seq, + bat_priv, + hard_iface, &idx)) { + i_hardif--; + break; + } + } + } + rcu_read_unlock(); + + cb->args[0] = i_hardif; + cb->args[1] = idx; +} + +/** + * batadv_iv_ogm_neigh_cmp() - compare the metrics of two neighbors + * @neigh1: the first neighbor object of the comparison + * @if_outgoing1: outgoing interface for the first neighbor + * @neigh2: the second neighbor object of the comparison + * @if_outgoing2: outgoing interface for the second neighbor + * + * Return: a value less, equal to or greater than 0 if the metric via neigh1 is + * lower, the same as or higher than the metric via neigh2 + */ +static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1, + struct batadv_hard_iface *if_outgoing1, + struct batadv_neigh_node *neigh2, + struct batadv_hard_iface *if_outgoing2) +{ + bool ret; + int diff; + + ret = batadv_iv_ogm_neigh_diff(neigh1, if_outgoing1, neigh2, + if_outgoing2, &diff); + if (!ret) + return 0; + + return diff; +} + +/** + * batadv_iv_ogm_neigh_is_sob() - check if neigh1 is similarly good or better + * than neigh2 from the metric prospective + * @neigh1: the first neighbor object of the comparison + * @if_outgoing1: outgoing interface for the first neighbor + * @neigh2: the second neighbor object of the comparison + * @if_outgoing2: outgoing interface for the second neighbor + * + * Return: true if the metric via neigh1 is equally good or better than + * the metric via neigh2, false otherwise. + */ +static bool +batadv_iv_ogm_neigh_is_sob(struct batadv_neigh_node *neigh1, + struct batadv_hard_iface *if_outgoing1, + struct batadv_neigh_node *neigh2, + struct batadv_hard_iface *if_outgoing2) +{ + bool ret; + int diff; + + ret = batadv_iv_ogm_neigh_diff(neigh1, if_outgoing1, neigh2, + if_outgoing2, &diff); + if (!ret) + return false; + + ret = diff > -BATADV_TQ_SIMILARITY_THRESHOLD; + return ret; +} + +static void batadv_iv_iface_enabled(struct batadv_hard_iface *hard_iface) +{ + /* begin scheduling originator messages on that interface */ + batadv_iv_ogm_schedule(hard_iface); +} + +/** + * batadv_iv_init_sel_class() - initialize GW selection class + * @bat_priv: the bat priv with all the soft interface information + */ +static void batadv_iv_init_sel_class(struct batadv_priv *bat_priv) +{ + /* set default TQ difference threshold to 20 */ + atomic_set(&bat_priv->gw.sel_class, 20); +} + +static struct batadv_gw_node * +batadv_iv_gw_get_best_gw_node(struct batadv_priv *bat_priv) +{ + struct batadv_neigh_node *router; + struct batadv_neigh_ifinfo *router_ifinfo; + struct batadv_gw_node *gw_node, *curr_gw = NULL; + u64 max_gw_factor = 0; + u64 tmp_gw_factor = 0; + u8 max_tq = 0; + u8 tq_avg; + struct batadv_orig_node *orig_node; + + rcu_read_lock(); + hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.gateway_list, list) { + orig_node = gw_node->orig_node; + router = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT); + if (!router) + continue; + + router_ifinfo = batadv_neigh_ifinfo_get(router, + BATADV_IF_DEFAULT); + if (!router_ifinfo) + goto next; + + if (!kref_get_unless_zero(&gw_node->refcount)) + goto next; + + tq_avg = router_ifinfo->bat_iv.tq_avg; + + switch (atomic_read(&bat_priv->gw.sel_class)) { + case 1: /* fast connection */ + tmp_gw_factor = tq_avg * tq_avg; + tmp_gw_factor *= gw_node->bandwidth_down; + tmp_gw_factor *= 100 * 100; + tmp_gw_factor >>= 18; + + if (tmp_gw_factor > max_gw_factor || + (tmp_gw_factor == max_gw_factor && + tq_avg > max_tq)) { + batadv_gw_node_put(curr_gw); + curr_gw = gw_node; + kref_get(&curr_gw->refcount); + } + break; + + default: /* 2: stable connection (use best statistic) + * 3: fast-switch (use best statistic but change as + * soon as a better gateway appears) + * XX: late-switch (use best statistic but change as + * soon as a better gateway appears which has + * $routing_class more tq points) + */ + if (tq_avg > max_tq) { + batadv_gw_node_put(curr_gw); + curr_gw = gw_node; + kref_get(&curr_gw->refcount); + } + break; + } + + if (tq_avg > max_tq) + max_tq = tq_avg; + + if (tmp_gw_factor > max_gw_factor) + max_gw_factor = tmp_gw_factor; + + batadv_gw_node_put(gw_node); + +next: + batadv_neigh_node_put(router); + batadv_neigh_ifinfo_put(router_ifinfo); + } + rcu_read_unlock(); + + return curr_gw; +} + +static bool batadv_iv_gw_is_eligible(struct batadv_priv *bat_priv, + struct batadv_orig_node *curr_gw_orig, + struct batadv_orig_node *orig_node) +{ + struct batadv_neigh_ifinfo *router_orig_ifinfo = NULL; + struct batadv_neigh_ifinfo *router_gw_ifinfo = NULL; + struct batadv_neigh_node *router_gw = NULL; + struct batadv_neigh_node *router_orig = NULL; + u8 gw_tq_avg, orig_tq_avg; + bool ret = false; + + /* dynamic re-election is performed only on fast or late switch */ + if (atomic_read(&bat_priv->gw.sel_class) <= 2) + return false; + + router_gw = batadv_orig_router_get(curr_gw_orig, BATADV_IF_DEFAULT); + if (!router_gw) { + ret = true; + goto out; + } + + router_gw_ifinfo = batadv_neigh_ifinfo_get(router_gw, + BATADV_IF_DEFAULT); + if (!router_gw_ifinfo) { + ret = true; + goto out; + } + + router_orig = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT); + if (!router_orig) + goto out; + + router_orig_ifinfo = batadv_neigh_ifinfo_get(router_orig, + BATADV_IF_DEFAULT); + if (!router_orig_ifinfo) + goto out; + + gw_tq_avg = router_gw_ifinfo->bat_iv.tq_avg; + orig_tq_avg = router_orig_ifinfo->bat_iv.tq_avg; + + /* the TQ value has to be better */ + if (orig_tq_avg < gw_tq_avg) + goto out; + + /* if the routing class is greater than 3 the value tells us how much + * greater the TQ value of the new gateway must be + */ + if ((atomic_read(&bat_priv->gw.sel_class) > 3) && + (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw.sel_class))) + goto out; + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n", + gw_tq_avg, orig_tq_avg); + + ret = true; +out: + batadv_neigh_ifinfo_put(router_gw_ifinfo); + batadv_neigh_ifinfo_put(router_orig_ifinfo); + batadv_neigh_node_put(router_gw); + batadv_neigh_node_put(router_orig); + + return ret; +} + +/** + * batadv_iv_gw_dump_entry() - Dump a gateway into a message + * @msg: Netlink message to dump into + * @portid: Port making netlink request + * @cb: Control block containing additional options + * @bat_priv: The bat priv with all the soft interface information + * @gw_node: Gateway to be dumped + * + * Return: Error code, or 0 on success + */ +static int batadv_iv_gw_dump_entry(struct sk_buff *msg, u32 portid, + struct netlink_callback *cb, + struct batadv_priv *bat_priv, + struct batadv_gw_node *gw_node) +{ + struct batadv_neigh_ifinfo *router_ifinfo = NULL; + struct batadv_neigh_node *router; + struct batadv_gw_node *curr_gw = NULL; + int ret = 0; + void *hdr; + + router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT); + if (!router) + goto out; + + router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT); + if (!router_ifinfo) + goto out; + + curr_gw = batadv_gw_get_selected_gw_node(bat_priv); + + hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq, + &batadv_netlink_family, NLM_F_MULTI, + BATADV_CMD_GET_GATEWAYS); + if (!hdr) { + ret = -ENOBUFS; + goto out; + } + + genl_dump_check_consistent(cb, hdr); + + ret = -EMSGSIZE; + + if (curr_gw == gw_node) + if (nla_put_flag(msg, BATADV_ATTR_FLAG_BEST)) { + genlmsg_cancel(msg, hdr); + goto out; + } + + if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, + gw_node->orig_node->orig) || + nla_put_u8(msg, BATADV_ATTR_TQ, router_ifinfo->bat_iv.tq_avg) || + nla_put(msg, BATADV_ATTR_ROUTER, ETH_ALEN, + router->addr) || + nla_put_string(msg, BATADV_ATTR_HARD_IFNAME, + router->if_incoming->net_dev->name) || + nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX, + router->if_incoming->net_dev->ifindex) || + nla_put_u32(msg, BATADV_ATTR_BANDWIDTH_DOWN, + gw_node->bandwidth_down) || + nla_put_u32(msg, BATADV_ATTR_BANDWIDTH_UP, + gw_node->bandwidth_up)) { + genlmsg_cancel(msg, hdr); + goto out; + } + + genlmsg_end(msg, hdr); + ret = 0; + +out: + batadv_gw_node_put(curr_gw); + batadv_neigh_ifinfo_put(router_ifinfo); + batadv_neigh_node_put(router); + return ret; +} + +/** + * batadv_iv_gw_dump() - Dump gateways into a message + * @msg: Netlink message to dump into + * @cb: Control block containing additional options + * @bat_priv: The bat priv with all the soft interface information + */ +static void batadv_iv_gw_dump(struct sk_buff *msg, struct netlink_callback *cb, + struct batadv_priv *bat_priv) +{ + int portid = NETLINK_CB(cb->skb).portid; + struct batadv_gw_node *gw_node; + int idx_skip = cb->args[0]; + int idx = 0; + + spin_lock_bh(&bat_priv->gw.list_lock); + cb->seq = bat_priv->gw.generation << 1 | 1; + + hlist_for_each_entry(gw_node, &bat_priv->gw.gateway_list, list) { + if (idx++ < idx_skip) + continue; + + if (batadv_iv_gw_dump_entry(msg, portid, cb, bat_priv, + gw_node)) { + idx_skip = idx - 1; + goto unlock; + } + } + + idx_skip = idx; +unlock: + spin_unlock_bh(&bat_priv->gw.list_lock); + + cb->args[0] = idx_skip; +} + +static struct batadv_algo_ops batadv_batman_iv __read_mostly = { + .name = "BATMAN_IV", + .iface = { + .enable = batadv_iv_ogm_iface_enable, + .enabled = batadv_iv_iface_enabled, + .disable = batadv_iv_ogm_iface_disable, + .update_mac = batadv_iv_ogm_iface_update_mac, + .primary_set = batadv_iv_ogm_primary_iface_set, + }, + .neigh = { + .cmp = batadv_iv_ogm_neigh_cmp, + .is_similar_or_better = batadv_iv_ogm_neigh_is_sob, + .dump = batadv_iv_ogm_neigh_dump, + }, + .orig = { + .dump = batadv_iv_ogm_orig_dump, + }, + .gw = { + .init_sel_class = batadv_iv_init_sel_class, + .get_best_gw_node = batadv_iv_gw_get_best_gw_node, + .is_eligible = batadv_iv_gw_is_eligible, + .dump = batadv_iv_gw_dump, + }, +}; + +/** + * batadv_iv_init() - B.A.T.M.A.N. IV initialization function + * + * Return: 0 on success or negative error number in case of failure + */ +int __init batadv_iv_init(void) +{ + int ret; + + /* batman originator packet */ + ret = batadv_recv_handler_register(BATADV_IV_OGM, + batadv_iv_ogm_receive); + if (ret < 0) + goto out; + + ret = batadv_algo_register(&batadv_batman_iv); + if (ret < 0) + goto handler_unregister; + + goto out; + +handler_unregister: + batadv_recv_handler_unregister(BATADV_IV_OGM); +out: + return ret; +} diff --git a/net/batman-adv/bat_iv_ogm.h b/net/batman-adv/bat_iv_ogm.h new file mode 100644 index 000000000..04b01bd68 --- /dev/null +++ b/net/batman-adv/bat_iv_ogm.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + */ + +#ifndef _NET_BATMAN_ADV_BAT_IV_OGM_H_ +#define _NET_BATMAN_ADV_BAT_IV_OGM_H_ + +#include "main.h" + +int batadv_iv_init(void); + +#endif /* _NET_BATMAN_ADV_BAT_IV_OGM_H_ */ diff --git a/net/batman-adv/bat_v.c b/net/batman-adv/bat_v.c new file mode 100644 index 000000000..54e41fc70 --- /dev/null +++ b/net/batman-adv/bat_v.c @@ -0,0 +1,910 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Linus Lüssing, Marek Lindner + */ + +#include "bat_v.h" +#include "main.h" + +#include <linux/atomic.h> +#include <linux/cache.h> +#include <linux/errno.h> +#include <linux/if_ether.h> +#include <linux/init.h> +#include <linux/jiffies.h> +#include <linux/kref.h> +#include <linux/list.h> +#include <linux/minmax.h> +#include <linux/netdevice.h> +#include <linux/netlink.h> +#include <linux/rculist.h> +#include <linux/rcupdate.h> +#include <linux/skbuff.h> +#include <linux/spinlock.h> +#include <linux/stddef.h> +#include <linux/types.h> +#include <linux/workqueue.h> +#include <net/genetlink.h> +#include <net/netlink.h> +#include <uapi/linux/batadv_packet.h> +#include <uapi/linux/batman_adv.h> + +#include "bat_algo.h" +#include "bat_v_elp.h" +#include "bat_v_ogm.h" +#include "gateway_client.h" +#include "gateway_common.h" +#include "hard-interface.h" +#include "hash.h" +#include "log.h" +#include "netlink.h" +#include "originator.h" + +static void batadv_v_iface_activate(struct batadv_hard_iface *hard_iface) +{ + struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); + struct batadv_hard_iface *primary_if; + + primary_if = batadv_primary_if_get_selected(bat_priv); + + if (primary_if) { + batadv_v_elp_iface_activate(primary_if, hard_iface); + batadv_hardif_put(primary_if); + } + + /* B.A.T.M.A.N. V does not use any queuing mechanism, therefore it can + * set the interface as ACTIVE right away, without any risk of race + * condition + */ + if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED) + hard_iface->if_status = BATADV_IF_ACTIVE; +} + +static int batadv_v_iface_enable(struct batadv_hard_iface *hard_iface) +{ + int ret; + + ret = batadv_v_elp_iface_enable(hard_iface); + if (ret < 0) + return ret; + + ret = batadv_v_ogm_iface_enable(hard_iface); + if (ret < 0) + batadv_v_elp_iface_disable(hard_iface); + + return ret; +} + +static void batadv_v_iface_disable(struct batadv_hard_iface *hard_iface) +{ + batadv_v_ogm_iface_disable(hard_iface); + batadv_v_elp_iface_disable(hard_iface); +} + +static void batadv_v_primary_iface_set(struct batadv_hard_iface *hard_iface) +{ + batadv_v_elp_primary_iface_set(hard_iface); + batadv_v_ogm_primary_iface_set(hard_iface); +} + +/** + * batadv_v_iface_update_mac() - react to hard-interface MAC address change + * @hard_iface: the modified interface + * + * If the modified interface is the primary one, update the originator + * address in the ELP and OGM messages to reflect the new MAC address. + */ +static void batadv_v_iface_update_mac(struct batadv_hard_iface *hard_iface) +{ + struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); + struct batadv_hard_iface *primary_if; + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (primary_if != hard_iface) + goto out; + + batadv_v_primary_iface_set(hard_iface); +out: + batadv_hardif_put(primary_if); +} + +static void +batadv_v_hardif_neigh_init(struct batadv_hardif_neigh_node *hardif_neigh) +{ + ewma_throughput_init(&hardif_neigh->bat_v.throughput); + INIT_WORK(&hardif_neigh->bat_v.metric_work, + batadv_v_elp_throughput_metric_update); +} + +/** + * batadv_v_neigh_dump_neigh() - Dump a neighbour into a message + * @msg: Netlink message to dump into + * @portid: Port making netlink request + * @seq: Sequence number of netlink message + * @hardif_neigh: Neighbour to dump + * + * Return: Error code, or 0 on success + */ +static int +batadv_v_neigh_dump_neigh(struct sk_buff *msg, u32 portid, u32 seq, + struct batadv_hardif_neigh_node *hardif_neigh) +{ + void *hdr; + unsigned int last_seen_msecs; + u32 throughput; + + last_seen_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen); + throughput = ewma_throughput_read(&hardif_neigh->bat_v.throughput); + throughput = throughput * 100; + + hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, NLM_F_MULTI, + BATADV_CMD_GET_NEIGHBORS); + if (!hdr) + return -ENOBUFS; + + if (nla_put(msg, BATADV_ATTR_NEIGH_ADDRESS, ETH_ALEN, + hardif_neigh->addr) || + nla_put_string(msg, BATADV_ATTR_HARD_IFNAME, + hardif_neigh->if_incoming->net_dev->name) || + nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX, + hardif_neigh->if_incoming->net_dev->ifindex) || + nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, + last_seen_msecs) || + nla_put_u32(msg, BATADV_ATTR_THROUGHPUT, throughput)) + goto nla_put_failure; + + genlmsg_end(msg, hdr); + return 0; + + nla_put_failure: + genlmsg_cancel(msg, hdr); + return -EMSGSIZE; +} + +/** + * batadv_v_neigh_dump_hardif() - Dump the neighbours of a hard interface into + * a message + * @msg: Netlink message to dump into + * @portid: Port making netlink request + * @seq: Sequence number of netlink message + * @bat_priv: The bat priv with all the soft interface information + * @hard_iface: The hard interface to be dumped + * @idx_s: Entries to be skipped + * + * This function assumes the caller holds rcu_read_lock(). + * + * Return: Error code, or 0 on success + */ +static int +batadv_v_neigh_dump_hardif(struct sk_buff *msg, u32 portid, u32 seq, + struct batadv_priv *bat_priv, + struct batadv_hard_iface *hard_iface, + int *idx_s) +{ + struct batadv_hardif_neigh_node *hardif_neigh; + int idx = 0; + + hlist_for_each_entry_rcu(hardif_neigh, + &hard_iface->neigh_list, list) { + if (idx++ < *idx_s) + continue; + + if (batadv_v_neigh_dump_neigh(msg, portid, seq, hardif_neigh)) { + *idx_s = idx - 1; + return -EMSGSIZE; + } + } + + *idx_s = 0; + return 0; +} + +/** + * batadv_v_neigh_dump() - Dump the neighbours of a hard interface into a + * message + * @msg: Netlink message to dump into + * @cb: Control block containing additional options + * @bat_priv: The bat priv with all the soft interface information + * @single_hardif: Limit dumping to this hard interface + */ +static void +batadv_v_neigh_dump(struct sk_buff *msg, struct netlink_callback *cb, + struct batadv_priv *bat_priv, + struct batadv_hard_iface *single_hardif) +{ + struct batadv_hard_iface *hard_iface; + int i_hardif = 0; + int i_hardif_s = cb->args[0]; + int idx = cb->args[1]; + int portid = NETLINK_CB(cb->skb).portid; + + rcu_read_lock(); + if (single_hardif) { + if (i_hardif_s == 0) { + if (batadv_v_neigh_dump_hardif(msg, portid, + cb->nlh->nlmsg_seq, + bat_priv, single_hardif, + &idx) == 0) + i_hardif++; + } + } else { + list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { + if (hard_iface->soft_iface != bat_priv->soft_iface) + continue; + + if (i_hardif++ < i_hardif_s) + continue; + + if (batadv_v_neigh_dump_hardif(msg, portid, + cb->nlh->nlmsg_seq, + bat_priv, hard_iface, + &idx)) { + i_hardif--; + break; + } + } + } + rcu_read_unlock(); + + cb->args[0] = i_hardif; + cb->args[1] = idx; +} + +/** + * batadv_v_orig_dump_subentry() - Dump an originator subentry into a message + * @msg: Netlink message to dump into + * @portid: Port making netlink request + * @seq: Sequence number of netlink message + * @bat_priv: The bat priv with all the soft interface information + * @if_outgoing: Limit dump to entries with this outgoing interface + * @orig_node: Originator to dump + * @neigh_node: Single hops neighbour + * @best: Is the best originator + * + * Return: Error code, or 0 on success + */ +static int +batadv_v_orig_dump_subentry(struct sk_buff *msg, u32 portid, u32 seq, + struct batadv_priv *bat_priv, + struct batadv_hard_iface *if_outgoing, + struct batadv_orig_node *orig_node, + struct batadv_neigh_node *neigh_node, + bool best) +{ + struct batadv_neigh_ifinfo *n_ifinfo; + unsigned int last_seen_msecs; + u32 throughput; + void *hdr; + + n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); + if (!n_ifinfo) + return 0; + + throughput = n_ifinfo->bat_v.throughput * 100; + + batadv_neigh_ifinfo_put(n_ifinfo); + + last_seen_msecs = jiffies_to_msecs(jiffies - orig_node->last_seen); + + if (if_outgoing != BATADV_IF_DEFAULT && + if_outgoing != neigh_node->if_incoming) + return 0; + + hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, NLM_F_MULTI, + BATADV_CMD_GET_ORIGINATORS); + if (!hdr) + return -ENOBUFS; + + if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, orig_node->orig) || + nla_put(msg, BATADV_ATTR_NEIGH_ADDRESS, ETH_ALEN, + neigh_node->addr) || + nla_put_string(msg, BATADV_ATTR_HARD_IFNAME, + neigh_node->if_incoming->net_dev->name) || + nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX, + neigh_node->if_incoming->net_dev->ifindex) || + nla_put_u32(msg, BATADV_ATTR_THROUGHPUT, throughput) || + nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, + last_seen_msecs)) + goto nla_put_failure; + + if (best && nla_put_flag(msg, BATADV_ATTR_FLAG_BEST)) + goto nla_put_failure; + + genlmsg_end(msg, hdr); + return 0; + + nla_put_failure: + genlmsg_cancel(msg, hdr); + return -EMSGSIZE; +} + +/** + * batadv_v_orig_dump_entry() - Dump an originator entry into a message + * @msg: Netlink message to dump into + * @portid: Port making netlink request + * @seq: Sequence number of netlink message + * @bat_priv: The bat priv with all the soft interface information + * @if_outgoing: Limit dump to entries with this outgoing interface + * @orig_node: Originator to dump + * @sub_s: Number of sub entries to skip + * + * This function assumes the caller holds rcu_read_lock(). + * + * Return: Error code, or 0 on success + */ +static int +batadv_v_orig_dump_entry(struct sk_buff *msg, u32 portid, u32 seq, + struct batadv_priv *bat_priv, + struct batadv_hard_iface *if_outgoing, + struct batadv_orig_node *orig_node, int *sub_s) +{ + struct batadv_neigh_node *neigh_node_best; + struct batadv_neigh_node *neigh_node; + int sub = 0; + bool best; + + neigh_node_best = batadv_orig_router_get(orig_node, if_outgoing); + if (!neigh_node_best) + goto out; + + hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) { + if (sub++ < *sub_s) + continue; + + best = (neigh_node == neigh_node_best); + + if (batadv_v_orig_dump_subentry(msg, portid, seq, bat_priv, + if_outgoing, orig_node, + neigh_node, best)) { + batadv_neigh_node_put(neigh_node_best); + + *sub_s = sub - 1; + return -EMSGSIZE; + } + } + + out: + batadv_neigh_node_put(neigh_node_best); + + *sub_s = 0; + return 0; +} + +/** + * batadv_v_orig_dump_bucket() - Dump an originator bucket into a message + * @msg: Netlink message to dump into + * @portid: Port making netlink request + * @seq: Sequence number of netlink message + * @bat_priv: The bat priv with all the soft interface information + * @if_outgoing: Limit dump to entries with this outgoing interface + * @head: Bucket to be dumped + * @idx_s: Number of entries to be skipped + * @sub: Number of sub entries to be skipped + * + * Return: Error code, or 0 on success + */ +static int +batadv_v_orig_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq, + struct batadv_priv *bat_priv, + struct batadv_hard_iface *if_outgoing, + struct hlist_head *head, int *idx_s, int *sub) +{ + struct batadv_orig_node *orig_node; + int idx = 0; + + rcu_read_lock(); + hlist_for_each_entry_rcu(orig_node, head, hash_entry) { + if (idx++ < *idx_s) + continue; + + if (batadv_v_orig_dump_entry(msg, portid, seq, bat_priv, + if_outgoing, orig_node, sub)) { + rcu_read_unlock(); + *idx_s = idx - 1; + return -EMSGSIZE; + } + } + rcu_read_unlock(); + + *idx_s = 0; + *sub = 0; + return 0; +} + +/** + * batadv_v_orig_dump() - Dump the originators into a message + * @msg: Netlink message to dump into + * @cb: Control block containing additional options + * @bat_priv: The bat priv with all the soft interface information + * @if_outgoing: Limit dump to entries with this outgoing interface + */ +static void +batadv_v_orig_dump(struct sk_buff *msg, struct netlink_callback *cb, + struct batadv_priv *bat_priv, + struct batadv_hard_iface *if_outgoing) +{ + struct batadv_hashtable *hash = bat_priv->orig_hash; + struct hlist_head *head; + int bucket = cb->args[0]; + int idx = cb->args[1]; + int sub = cb->args[2]; + int portid = NETLINK_CB(cb->skb).portid; + + while (bucket < hash->size) { + head = &hash->table[bucket]; + + if (batadv_v_orig_dump_bucket(msg, portid, + cb->nlh->nlmsg_seq, + bat_priv, if_outgoing, head, &idx, + &sub)) + break; + + bucket++; + } + + cb->args[0] = bucket; + cb->args[1] = idx; + cb->args[2] = sub; +} + +static int batadv_v_neigh_cmp(struct batadv_neigh_node *neigh1, + struct batadv_hard_iface *if_outgoing1, + struct batadv_neigh_node *neigh2, + struct batadv_hard_iface *if_outgoing2) +{ + struct batadv_neigh_ifinfo *ifinfo1, *ifinfo2; + int ret = 0; + + ifinfo1 = batadv_neigh_ifinfo_get(neigh1, if_outgoing1); + if (!ifinfo1) + goto err_ifinfo1; + + ifinfo2 = batadv_neigh_ifinfo_get(neigh2, if_outgoing2); + if (!ifinfo2) + goto err_ifinfo2; + + ret = ifinfo1->bat_v.throughput - ifinfo2->bat_v.throughput; + + batadv_neigh_ifinfo_put(ifinfo2); +err_ifinfo2: + batadv_neigh_ifinfo_put(ifinfo1); +err_ifinfo1: + return ret; +} + +static bool batadv_v_neigh_is_sob(struct batadv_neigh_node *neigh1, + struct batadv_hard_iface *if_outgoing1, + struct batadv_neigh_node *neigh2, + struct batadv_hard_iface *if_outgoing2) +{ + struct batadv_neigh_ifinfo *ifinfo1, *ifinfo2; + u32 threshold; + bool ret = false; + + ifinfo1 = batadv_neigh_ifinfo_get(neigh1, if_outgoing1); + if (!ifinfo1) + goto err_ifinfo1; + + ifinfo2 = batadv_neigh_ifinfo_get(neigh2, if_outgoing2); + if (!ifinfo2) + goto err_ifinfo2; + + threshold = ifinfo1->bat_v.throughput / 4; + threshold = ifinfo1->bat_v.throughput - threshold; + + ret = ifinfo2->bat_v.throughput > threshold; + + batadv_neigh_ifinfo_put(ifinfo2); +err_ifinfo2: + batadv_neigh_ifinfo_put(ifinfo1); +err_ifinfo1: + return ret; +} + +/** + * batadv_v_init_sel_class() - initialize GW selection class + * @bat_priv: the bat priv with all the soft interface information + */ +static void batadv_v_init_sel_class(struct batadv_priv *bat_priv) +{ + /* set default throughput difference threshold to 5Mbps */ + atomic_set(&bat_priv->gw.sel_class, 50); +} + +static ssize_t batadv_v_store_sel_class(struct batadv_priv *bat_priv, + char *buff, size_t count) +{ + u32 old_class, class; + + if (!batadv_parse_throughput(bat_priv->soft_iface, buff, + "B.A.T.M.A.N. V GW selection class", + &class)) + return -EINVAL; + + old_class = atomic_read(&bat_priv->gw.sel_class); + atomic_set(&bat_priv->gw.sel_class, class); + + if (old_class != class) + batadv_gw_reselect(bat_priv); + + return count; +} + +/** + * batadv_v_gw_throughput_get() - retrieve the GW-bandwidth for a given GW + * @gw_node: the GW to retrieve the metric for + * @bw: the pointer where the metric will be stored. The metric is computed as + * the minimum between the GW advertised throughput and the path throughput to + * it in the mesh + * + * Return: 0 on success, -1 on failure + */ +static int batadv_v_gw_throughput_get(struct batadv_gw_node *gw_node, u32 *bw) +{ + struct batadv_neigh_ifinfo *router_ifinfo = NULL; + struct batadv_orig_node *orig_node; + struct batadv_neigh_node *router; + int ret = -1; + + orig_node = gw_node->orig_node; + router = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT); + if (!router) + goto out; + + router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT); + if (!router_ifinfo) + goto out; + + /* the GW metric is computed as the minimum between the path throughput + * to reach the GW itself and the advertised bandwidth. + * This gives us an approximation of the effective throughput that the + * client can expect via this particular GW node + */ + *bw = router_ifinfo->bat_v.throughput; + *bw = min_t(u32, *bw, gw_node->bandwidth_down); + + ret = 0; +out: + batadv_neigh_node_put(router); + batadv_neigh_ifinfo_put(router_ifinfo); + + return ret; +} + +/** + * batadv_v_gw_get_best_gw_node() - retrieve the best GW node + * @bat_priv: the bat priv with all the soft interface information + * + * Return: the GW node having the best GW-metric, NULL if no GW is known + */ +static struct batadv_gw_node * +batadv_v_gw_get_best_gw_node(struct batadv_priv *bat_priv) +{ + struct batadv_gw_node *gw_node, *curr_gw = NULL; + u32 max_bw = 0, bw; + + rcu_read_lock(); + hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.gateway_list, list) { + if (!kref_get_unless_zero(&gw_node->refcount)) + continue; + + if (batadv_v_gw_throughput_get(gw_node, &bw) < 0) + goto next; + + if (curr_gw && bw <= max_bw) + goto next; + + batadv_gw_node_put(curr_gw); + + curr_gw = gw_node; + kref_get(&curr_gw->refcount); + max_bw = bw; + +next: + batadv_gw_node_put(gw_node); + } + rcu_read_unlock(); + + return curr_gw; +} + +/** + * batadv_v_gw_is_eligible() - check if a originator would be selected as GW + * @bat_priv: the bat priv with all the soft interface information + * @curr_gw_orig: originator representing the currently selected GW + * @orig_node: the originator representing the new candidate + * + * Return: true if orig_node can be selected as current GW, false otherwise + */ +static bool batadv_v_gw_is_eligible(struct batadv_priv *bat_priv, + struct batadv_orig_node *curr_gw_orig, + struct batadv_orig_node *orig_node) +{ + struct batadv_gw_node *curr_gw, *orig_gw = NULL; + u32 gw_throughput, orig_throughput, threshold; + bool ret = false; + + threshold = atomic_read(&bat_priv->gw.sel_class); + + curr_gw = batadv_gw_node_get(bat_priv, curr_gw_orig); + if (!curr_gw) { + ret = true; + goto out; + } + + if (batadv_v_gw_throughput_get(curr_gw, &gw_throughput) < 0) { + ret = true; + goto out; + } + + orig_gw = batadv_gw_node_get(bat_priv, orig_node); + if (!orig_gw) + goto out; + + if (batadv_v_gw_throughput_get(orig_gw, &orig_throughput) < 0) + goto out; + + if (orig_throughput < gw_throughput) + goto out; + + if ((orig_throughput - gw_throughput) < threshold) + goto out; + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Restarting gateway selection: better gateway found (throughput curr: %u, throughput new: %u)\n", + gw_throughput, orig_throughput); + + ret = true; +out: + batadv_gw_node_put(curr_gw); + batadv_gw_node_put(orig_gw); + + return ret; +} + +/** + * batadv_v_gw_dump_entry() - Dump a gateway into a message + * @msg: Netlink message to dump into + * @portid: Port making netlink request + * @cb: Control block containing additional options + * @bat_priv: The bat priv with all the soft interface information + * @gw_node: Gateway to be dumped + * + * Return: Error code, or 0 on success + */ +static int batadv_v_gw_dump_entry(struct sk_buff *msg, u32 portid, + struct netlink_callback *cb, + struct batadv_priv *bat_priv, + struct batadv_gw_node *gw_node) +{ + struct batadv_neigh_ifinfo *router_ifinfo = NULL; + struct batadv_neigh_node *router; + struct batadv_gw_node *curr_gw = NULL; + int ret = 0; + void *hdr; + + router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT); + if (!router) + goto out; + + router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT); + if (!router_ifinfo) + goto out; + + curr_gw = batadv_gw_get_selected_gw_node(bat_priv); + + hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq, + &batadv_netlink_family, NLM_F_MULTI, + BATADV_CMD_GET_GATEWAYS); + if (!hdr) { + ret = -ENOBUFS; + goto out; + } + + genl_dump_check_consistent(cb, hdr); + + ret = -EMSGSIZE; + + if (curr_gw == gw_node) { + if (nla_put_flag(msg, BATADV_ATTR_FLAG_BEST)) { + genlmsg_cancel(msg, hdr); + goto out; + } + } + + if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, + gw_node->orig_node->orig)) { + genlmsg_cancel(msg, hdr); + goto out; + } + + if (nla_put_u32(msg, BATADV_ATTR_THROUGHPUT, + router_ifinfo->bat_v.throughput)) { + genlmsg_cancel(msg, hdr); + goto out; + } + + if (nla_put(msg, BATADV_ATTR_ROUTER, ETH_ALEN, router->addr)) { + genlmsg_cancel(msg, hdr); + goto out; + } + + if (nla_put_string(msg, BATADV_ATTR_HARD_IFNAME, + router->if_incoming->net_dev->name)) { + genlmsg_cancel(msg, hdr); + goto out; + } + + if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX, + router->if_incoming->net_dev->ifindex)) { + genlmsg_cancel(msg, hdr); + goto out; + } + + if (nla_put_u32(msg, BATADV_ATTR_BANDWIDTH_DOWN, + gw_node->bandwidth_down)) { + genlmsg_cancel(msg, hdr); + goto out; + } + + if (nla_put_u32(msg, BATADV_ATTR_BANDWIDTH_UP, gw_node->bandwidth_up)) { + genlmsg_cancel(msg, hdr); + goto out; + } + + genlmsg_end(msg, hdr); + ret = 0; + +out: + batadv_gw_node_put(curr_gw); + batadv_neigh_ifinfo_put(router_ifinfo); + batadv_neigh_node_put(router); + return ret; +} + +/** + * batadv_v_gw_dump() - Dump gateways into a message + * @msg: Netlink message to dump into + * @cb: Control block containing additional options + * @bat_priv: The bat priv with all the soft interface information + */ +static void batadv_v_gw_dump(struct sk_buff *msg, struct netlink_callback *cb, + struct batadv_priv *bat_priv) +{ + int portid = NETLINK_CB(cb->skb).portid; + struct batadv_gw_node *gw_node; + int idx_skip = cb->args[0]; + int idx = 0; + + spin_lock_bh(&bat_priv->gw.list_lock); + cb->seq = bat_priv->gw.generation << 1 | 1; + + hlist_for_each_entry(gw_node, &bat_priv->gw.gateway_list, list) { + if (idx++ < idx_skip) + continue; + + if (batadv_v_gw_dump_entry(msg, portid, cb, bat_priv, + gw_node)) { + idx_skip = idx - 1; + goto unlock; + } + } + + idx_skip = idx; +unlock: + spin_unlock_bh(&bat_priv->gw.list_lock); + + cb->args[0] = idx_skip; +} + +static struct batadv_algo_ops batadv_batman_v __read_mostly = { + .name = "BATMAN_V", + .iface = { + .activate = batadv_v_iface_activate, + .enable = batadv_v_iface_enable, + .disable = batadv_v_iface_disable, + .update_mac = batadv_v_iface_update_mac, + .primary_set = batadv_v_primary_iface_set, + }, + .neigh = { + .hardif_init = batadv_v_hardif_neigh_init, + .cmp = batadv_v_neigh_cmp, + .is_similar_or_better = batadv_v_neigh_is_sob, + .dump = batadv_v_neigh_dump, + }, + .orig = { + .dump = batadv_v_orig_dump, + }, + .gw = { + .init_sel_class = batadv_v_init_sel_class, + .store_sel_class = batadv_v_store_sel_class, + .get_best_gw_node = batadv_v_gw_get_best_gw_node, + .is_eligible = batadv_v_gw_is_eligible, + .dump = batadv_v_gw_dump, + }, +}; + +/** + * batadv_v_hardif_init() - initialize the algorithm specific fields in the + * hard-interface object + * @hard_iface: the hard-interface to initialize + */ +void batadv_v_hardif_init(struct batadv_hard_iface *hard_iface) +{ + /* enable link throughput auto-detection by setting the throughput + * override to zero + */ + atomic_set(&hard_iface->bat_v.throughput_override, 0); + atomic_set(&hard_iface->bat_v.elp_interval, 500); + + hard_iface->bat_v.aggr_len = 0; + skb_queue_head_init(&hard_iface->bat_v.aggr_list); + INIT_DELAYED_WORK(&hard_iface->bat_v.aggr_wq, + batadv_v_ogm_aggr_work); +} + +/** + * batadv_v_mesh_init() - initialize the B.A.T.M.A.N. V private resources for a + * mesh + * @bat_priv: the object representing the mesh interface to initialise + * + * Return: 0 on success or a negative error code otherwise + */ +int batadv_v_mesh_init(struct batadv_priv *bat_priv) +{ + int ret = 0; + + ret = batadv_v_ogm_init(bat_priv); + if (ret < 0) + return ret; + + return 0; +} + +/** + * batadv_v_mesh_free() - free the B.A.T.M.A.N. V private resources for a mesh + * @bat_priv: the object representing the mesh interface to free + */ +void batadv_v_mesh_free(struct batadv_priv *bat_priv) +{ + batadv_v_ogm_free(bat_priv); +} + +/** + * batadv_v_init() - B.A.T.M.A.N. V initialization function + * + * Description: Takes care of initializing all the subcomponents. + * It is invoked upon module load only. + * + * Return: 0 on success or a negative error code otherwise + */ +int __init batadv_v_init(void) +{ + int ret; + + /* B.A.T.M.A.N. V echo location protocol packet */ + ret = batadv_recv_handler_register(BATADV_ELP, + batadv_v_elp_packet_recv); + if (ret < 0) + return ret; + + ret = batadv_recv_handler_register(BATADV_OGM2, + batadv_v_ogm_packet_recv); + if (ret < 0) + goto elp_unregister; + + ret = batadv_algo_register(&batadv_batman_v); + if (ret < 0) + goto ogm_unregister; + + return ret; + +ogm_unregister: + batadv_recv_handler_unregister(BATADV_OGM2); + +elp_unregister: + batadv_recv_handler_unregister(BATADV_ELP); + + return ret; +} diff --git a/net/batman-adv/bat_v.h b/net/batman-adv/bat_v.h new file mode 100644 index 000000000..964431f4d --- /dev/null +++ b/net/batman-adv/bat_v.h @@ -0,0 +1,41 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner, Linus Lüssing + */ + +#ifndef _NET_BATMAN_ADV_BAT_V_H_ +#define _NET_BATMAN_ADV_BAT_V_H_ + +#include "main.h" + +#ifdef CONFIG_BATMAN_ADV_BATMAN_V + +int batadv_v_init(void); +void batadv_v_hardif_init(struct batadv_hard_iface *hardif); +int batadv_v_mesh_init(struct batadv_priv *bat_priv); +void batadv_v_mesh_free(struct batadv_priv *bat_priv); + +#else + +static inline int batadv_v_init(void) +{ + return 0; +} + +static inline void batadv_v_hardif_init(struct batadv_hard_iface *hardif) +{ +} + +static inline int batadv_v_mesh_init(struct batadv_priv *bat_priv) +{ + return 0; +} + +static inline void batadv_v_mesh_free(struct batadv_priv *bat_priv) +{ +} + +#endif /* CONFIG_BATMAN_ADV_BATMAN_V */ + +#endif /* _NET_BATMAN_ADV_BAT_V_H_ */ diff --git a/net/batman-adv/bat_v_elp.c b/net/batman-adv/bat_v_elp.c new file mode 100644 index 000000000..98a624f32 --- /dev/null +++ b/net/batman-adv/bat_v_elp.c @@ -0,0 +1,551 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Linus Lüssing, Marek Lindner + */ + +#include "bat_v_elp.h" +#include "main.h" + +#include <linux/atomic.h> +#include <linux/bitops.h> +#include <linux/byteorder/generic.h> +#include <linux/container_of.h> +#include <linux/errno.h> +#include <linux/etherdevice.h> +#include <linux/ethtool.h> +#include <linux/gfp.h> +#include <linux/if_ether.h> +#include <linux/jiffies.h> +#include <linux/kref.h> +#include <linux/minmax.h> +#include <linux/netdevice.h> +#include <linux/nl80211.h> +#include <linux/prandom.h> +#include <linux/random.h> +#include <linux/rculist.h> +#include <linux/rcupdate.h> +#include <linux/rtnetlink.h> +#include <linux/skbuff.h> +#include <linux/stddef.h> +#include <linux/string.h> +#include <linux/types.h> +#include <linux/workqueue.h> +#include <net/cfg80211.h> +#include <uapi/linux/batadv_packet.h> + +#include "bat_algo.h" +#include "bat_v_ogm.h" +#include "hard-interface.h" +#include "log.h" +#include "originator.h" +#include "routing.h" +#include "send.h" + +/** + * batadv_v_elp_start_timer() - restart timer for ELP periodic work + * @hard_iface: the interface for which the timer has to be reset + */ +static void batadv_v_elp_start_timer(struct batadv_hard_iface *hard_iface) +{ + unsigned int msecs; + + msecs = atomic_read(&hard_iface->bat_v.elp_interval) - BATADV_JITTER; + msecs += prandom_u32_max(2 * BATADV_JITTER); + + queue_delayed_work(batadv_event_workqueue, &hard_iface->bat_v.elp_wq, + msecs_to_jiffies(msecs)); +} + +/** + * batadv_v_elp_get_throughput() - get the throughput towards a neighbour + * @neigh: the neighbour for which the throughput has to be obtained + * + * Return: The throughput towards the given neighbour in multiples of 100kpbs + * (a value of '1' equals 0.1Mbps, '10' equals 1Mbps, etc). + */ +static u32 batadv_v_elp_get_throughput(struct batadv_hardif_neigh_node *neigh) +{ + struct batadv_hard_iface *hard_iface = neigh->if_incoming; + struct ethtool_link_ksettings link_settings; + struct net_device *real_netdev; + struct station_info sinfo; + u32 throughput; + int ret; + + /* if the user specified a customised value for this interface, then + * return it directly + */ + throughput = atomic_read(&hard_iface->bat_v.throughput_override); + if (throughput != 0) + return throughput; + + /* if this is a wireless device, then ask its throughput through + * cfg80211 API + */ + if (batadv_is_wifi_hardif(hard_iface)) { + if (!batadv_is_cfg80211_hardif(hard_iface)) + /* unsupported WiFi driver version */ + goto default_throughput; + + real_netdev = batadv_get_real_netdev(hard_iface->net_dev); + if (!real_netdev) + goto default_throughput; + + ret = cfg80211_get_station(real_netdev, neigh->addr, &sinfo); + + if (!ret) { + /* free the TID stats immediately */ + cfg80211_sinfo_release_content(&sinfo); + } + + dev_put(real_netdev); + if (ret == -ENOENT) { + /* Node is not associated anymore! It would be + * possible to delete this neighbor. For now set + * the throughput metric to 0. + */ + return 0; + } + if (ret) + goto default_throughput; + + if (sinfo.filled & BIT(NL80211_STA_INFO_EXPECTED_THROUGHPUT)) + return sinfo.expected_throughput / 100; + + /* try to estimate the expected throughput based on reported tx + * rates + */ + if (sinfo.filled & BIT(NL80211_STA_INFO_TX_BITRATE)) + return cfg80211_calculate_bitrate(&sinfo.txrate) / 3; + + goto default_throughput; + } + + /* if not a wifi interface, check if this device provides data via + * ethtool (e.g. an Ethernet adapter) + */ + rtnl_lock(); + ret = __ethtool_get_link_ksettings(hard_iface->net_dev, &link_settings); + rtnl_unlock(); + if (ret == 0) { + /* link characteristics might change over time */ + if (link_settings.base.duplex == DUPLEX_FULL) + hard_iface->bat_v.flags |= BATADV_FULL_DUPLEX; + else + hard_iface->bat_v.flags &= ~BATADV_FULL_DUPLEX; + + throughput = link_settings.base.speed; + if (throughput && throughput != SPEED_UNKNOWN) + return throughput * 10; + } + +default_throughput: + if (!(hard_iface->bat_v.flags & BATADV_WARNING_DEFAULT)) { + batadv_info(hard_iface->soft_iface, + "WiFi driver or ethtool info does not provide information about link speeds on interface %s, therefore defaulting to hardcoded throughput values of %u.%1u Mbps. Consider overriding the throughput manually or checking your driver.\n", + hard_iface->net_dev->name, + BATADV_THROUGHPUT_DEFAULT_VALUE / 10, + BATADV_THROUGHPUT_DEFAULT_VALUE % 10); + hard_iface->bat_v.flags |= BATADV_WARNING_DEFAULT; + } + + /* if none of the above cases apply, return the base_throughput */ + return BATADV_THROUGHPUT_DEFAULT_VALUE; +} + +/** + * batadv_v_elp_throughput_metric_update() - worker updating the throughput + * metric of a single hop neighbour + * @work: the work queue item + */ +void batadv_v_elp_throughput_metric_update(struct work_struct *work) +{ + struct batadv_hardif_neigh_node_bat_v *neigh_bat_v; + struct batadv_hardif_neigh_node *neigh; + + neigh_bat_v = container_of(work, struct batadv_hardif_neigh_node_bat_v, + metric_work); + neigh = container_of(neigh_bat_v, struct batadv_hardif_neigh_node, + bat_v); + + ewma_throughput_add(&neigh->bat_v.throughput, + batadv_v_elp_get_throughput(neigh)); + + /* decrement refcounter to balance increment performed before scheduling + * this task + */ + batadv_hardif_neigh_put(neigh); +} + +/** + * batadv_v_elp_wifi_neigh_probe() - send link probing packets to a neighbour + * @neigh: the neighbour to probe + * + * Sends a predefined number of unicast wifi packets to a given neighbour in + * order to trigger the throughput estimation on this link by the RC algorithm. + * Packets are sent only if there is not enough payload unicast traffic towards + * this neighbour.. + * + * Return: True on success and false in case of error during skb preparation. + */ +static bool +batadv_v_elp_wifi_neigh_probe(struct batadv_hardif_neigh_node *neigh) +{ + struct batadv_hard_iface *hard_iface = neigh->if_incoming; + struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); + unsigned long last_tx_diff; + struct sk_buff *skb; + int probe_len, i; + int elp_skb_len; + + /* this probing routine is for Wifi neighbours only */ + if (!batadv_is_wifi_hardif(hard_iface)) + return true; + + /* probe the neighbor only if no unicast packets have been sent + * to it in the last 100 milliseconds: this is the rate control + * algorithm sampling interval (minstrel). In this way, if not + * enough traffic has been sent to the neighbor, batman-adv can + * generate 2 probe packets and push the RC algorithm to perform + * the sampling + */ + last_tx_diff = jiffies_to_msecs(jiffies - neigh->bat_v.last_unicast_tx); + if (last_tx_diff <= BATADV_ELP_PROBE_MAX_TX_DIFF) + return true; + + probe_len = max_t(int, sizeof(struct batadv_elp_packet), + BATADV_ELP_MIN_PROBE_SIZE); + + for (i = 0; i < BATADV_ELP_PROBES_PER_NODE; i++) { + elp_skb_len = hard_iface->bat_v.elp_skb->len; + skb = skb_copy_expand(hard_iface->bat_v.elp_skb, 0, + probe_len - elp_skb_len, + GFP_ATOMIC); + if (!skb) + return false; + + /* Tell the skb to get as big as the allocated space (we want + * the packet to be exactly of that size to make the link + * throughput estimation effective. + */ + skb_put_zero(skb, probe_len - hard_iface->bat_v.elp_skb->len); + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Sending unicast (probe) ELP packet on interface %s to %pM\n", + hard_iface->net_dev->name, neigh->addr); + + batadv_send_skb_packet(skb, hard_iface, neigh->addr); + } + + return true; +} + +/** + * batadv_v_elp_periodic_work() - ELP periodic task per interface + * @work: work queue item + * + * Emits broadcast ELP messages in regular intervals. + */ +static void batadv_v_elp_periodic_work(struct work_struct *work) +{ + struct batadv_hardif_neigh_node *hardif_neigh; + struct batadv_hard_iface *hard_iface; + struct batadv_hard_iface_bat_v *bat_v; + struct batadv_elp_packet *elp_packet; + struct batadv_priv *bat_priv; + struct sk_buff *skb; + u32 elp_interval; + bool ret; + + bat_v = container_of(work, struct batadv_hard_iface_bat_v, elp_wq.work); + hard_iface = container_of(bat_v, struct batadv_hard_iface, bat_v); + bat_priv = netdev_priv(hard_iface->soft_iface); + + if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) + goto out; + + /* we are in the process of shutting this interface down */ + if (hard_iface->if_status == BATADV_IF_NOT_IN_USE || + hard_iface->if_status == BATADV_IF_TO_BE_REMOVED) + goto out; + + /* the interface was enabled but may not be ready yet */ + if (hard_iface->if_status != BATADV_IF_ACTIVE) + goto restart_timer; + + skb = skb_copy(hard_iface->bat_v.elp_skb, GFP_ATOMIC); + if (!skb) + goto restart_timer; + + elp_packet = (struct batadv_elp_packet *)skb->data; + elp_packet->seqno = htonl(atomic_read(&hard_iface->bat_v.elp_seqno)); + elp_interval = atomic_read(&hard_iface->bat_v.elp_interval); + elp_packet->elp_interval = htonl(elp_interval); + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Sending broadcast ELP packet on interface %s, seqno %u\n", + hard_iface->net_dev->name, + atomic_read(&hard_iface->bat_v.elp_seqno)); + + batadv_send_broadcast_skb(skb, hard_iface); + + atomic_inc(&hard_iface->bat_v.elp_seqno); + + /* The throughput metric is updated on each sent packet. This way, if a + * node is dead and no longer sends packets, batman-adv is still able to + * react timely to its death. + * + * The throughput metric is updated by following these steps: + * 1) if the hard_iface is wifi => send a number of unicast ELPs for + * probing/sampling to each neighbor + * 2) update the throughput metric value of each neighbor (note that the + * value retrieved in this step might be 100ms old because the + * probing packets at point 1) could still be in the HW queue) + */ + rcu_read_lock(); + hlist_for_each_entry_rcu(hardif_neigh, &hard_iface->neigh_list, list) { + if (!batadv_v_elp_wifi_neigh_probe(hardif_neigh)) + /* if something goes wrong while probing, better to stop + * sending packets immediately and reschedule the task + */ + break; + + if (!kref_get_unless_zero(&hardif_neigh->refcount)) + continue; + + /* Reading the estimated throughput from cfg80211 is a task that + * may sleep and that is not allowed in an rcu protected + * context. Therefore schedule a task for that. + */ + ret = queue_work(batadv_event_workqueue, + &hardif_neigh->bat_v.metric_work); + + if (!ret) + batadv_hardif_neigh_put(hardif_neigh); + } + rcu_read_unlock(); + +restart_timer: + batadv_v_elp_start_timer(hard_iface); +out: + return; +} + +/** + * batadv_v_elp_iface_enable() - setup the ELP interface private resources + * @hard_iface: interface for which the data has to be prepared + * + * Return: 0 on success or a -ENOMEM in case of failure. + */ +int batadv_v_elp_iface_enable(struct batadv_hard_iface *hard_iface) +{ + static const size_t tvlv_padding = sizeof(__be32); + struct batadv_elp_packet *elp_packet; + unsigned char *elp_buff; + u32 random_seqno; + size_t size; + int res = -ENOMEM; + + size = ETH_HLEN + NET_IP_ALIGN + BATADV_ELP_HLEN + tvlv_padding; + hard_iface->bat_v.elp_skb = dev_alloc_skb(size); + if (!hard_iface->bat_v.elp_skb) + goto out; + + skb_reserve(hard_iface->bat_v.elp_skb, ETH_HLEN + NET_IP_ALIGN); + elp_buff = skb_put_zero(hard_iface->bat_v.elp_skb, + BATADV_ELP_HLEN + tvlv_padding); + elp_packet = (struct batadv_elp_packet *)elp_buff; + + elp_packet->packet_type = BATADV_ELP; + elp_packet->version = BATADV_COMPAT_VERSION; + + /* randomize initial seqno to avoid collision */ + get_random_bytes(&random_seqno, sizeof(random_seqno)); + atomic_set(&hard_iface->bat_v.elp_seqno, random_seqno); + + /* assume full-duplex by default */ + hard_iface->bat_v.flags |= BATADV_FULL_DUPLEX; + + /* warn the user (again) if there is no throughput data is available */ + hard_iface->bat_v.flags &= ~BATADV_WARNING_DEFAULT; + + if (batadv_is_wifi_hardif(hard_iface)) + hard_iface->bat_v.flags &= ~BATADV_FULL_DUPLEX; + + INIT_DELAYED_WORK(&hard_iface->bat_v.elp_wq, + batadv_v_elp_periodic_work); + batadv_v_elp_start_timer(hard_iface); + res = 0; + +out: + return res; +} + +/** + * batadv_v_elp_iface_disable() - release ELP interface private resources + * @hard_iface: interface for which the resources have to be released + */ +void batadv_v_elp_iface_disable(struct batadv_hard_iface *hard_iface) +{ + cancel_delayed_work_sync(&hard_iface->bat_v.elp_wq); + + dev_kfree_skb(hard_iface->bat_v.elp_skb); + hard_iface->bat_v.elp_skb = NULL; +} + +/** + * batadv_v_elp_iface_activate() - update the ELP buffer belonging to the given + * hard-interface + * @primary_iface: the new primary interface + * @hard_iface: interface holding the to-be-updated buffer + */ +void batadv_v_elp_iface_activate(struct batadv_hard_iface *primary_iface, + struct batadv_hard_iface *hard_iface) +{ + struct batadv_elp_packet *elp_packet; + struct sk_buff *skb; + + if (!hard_iface->bat_v.elp_skb) + return; + + skb = hard_iface->bat_v.elp_skb; + elp_packet = (struct batadv_elp_packet *)skb->data; + ether_addr_copy(elp_packet->orig, + primary_iface->net_dev->dev_addr); +} + +/** + * batadv_v_elp_primary_iface_set() - change internal data to reflect the new + * primary interface + * @primary_iface: the new primary interface + */ +void batadv_v_elp_primary_iface_set(struct batadv_hard_iface *primary_iface) +{ + struct batadv_hard_iface *hard_iface; + + /* update orig field of every elp iface belonging to this mesh */ + rcu_read_lock(); + list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { + if (primary_iface->soft_iface != hard_iface->soft_iface) + continue; + + batadv_v_elp_iface_activate(primary_iface, hard_iface); + } + rcu_read_unlock(); +} + +/** + * batadv_v_elp_neigh_update() - update an ELP neighbour node + * @bat_priv: the bat priv with all the soft interface information + * @neigh_addr: the neighbour interface address + * @if_incoming: the interface the packet was received through + * @elp_packet: the received ELP packet + * + * Updates the ELP neighbour node state with the data received within the new + * ELP packet. + */ +static void batadv_v_elp_neigh_update(struct batadv_priv *bat_priv, + u8 *neigh_addr, + struct batadv_hard_iface *if_incoming, + struct batadv_elp_packet *elp_packet) + +{ + struct batadv_neigh_node *neigh; + struct batadv_orig_node *orig_neigh; + struct batadv_hardif_neigh_node *hardif_neigh; + s32 seqno_diff; + s32 elp_latest_seqno; + + orig_neigh = batadv_v_ogm_orig_get(bat_priv, elp_packet->orig); + if (!orig_neigh) + return; + + neigh = batadv_neigh_node_get_or_create(orig_neigh, + if_incoming, neigh_addr); + if (!neigh) + goto orig_free; + + hardif_neigh = batadv_hardif_neigh_get(if_incoming, neigh_addr); + if (!hardif_neigh) + goto neigh_free; + + elp_latest_seqno = hardif_neigh->bat_v.elp_latest_seqno; + seqno_diff = ntohl(elp_packet->seqno) - elp_latest_seqno; + + /* known or older sequence numbers are ignored. However always adopt + * if the router seems to have been restarted. + */ + if (seqno_diff < 1 && seqno_diff > -BATADV_ELP_MAX_AGE) + goto hardif_free; + + neigh->last_seen = jiffies; + hardif_neigh->last_seen = jiffies; + hardif_neigh->bat_v.elp_latest_seqno = ntohl(elp_packet->seqno); + hardif_neigh->bat_v.elp_interval = ntohl(elp_packet->elp_interval); + +hardif_free: + batadv_hardif_neigh_put(hardif_neigh); +neigh_free: + batadv_neigh_node_put(neigh); +orig_free: + batadv_orig_node_put(orig_neigh); +} + +/** + * batadv_v_elp_packet_recv() - main ELP packet handler + * @skb: the received packet + * @if_incoming: the interface this packet was received through + * + * Return: NET_RX_SUCCESS and consumes the skb if the packet was properly + * processed or NET_RX_DROP in case of failure. + */ +int batadv_v_elp_packet_recv(struct sk_buff *skb, + struct batadv_hard_iface *if_incoming) +{ + struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); + struct batadv_elp_packet *elp_packet; + struct batadv_hard_iface *primary_if; + struct ethhdr *ethhdr; + bool res; + int ret = NET_RX_DROP; + + res = batadv_check_management_packet(skb, if_incoming, BATADV_ELP_HLEN); + if (!res) + goto free_skb; + + ethhdr = eth_hdr(skb); + if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) + goto free_skb; + + /* did we receive a B.A.T.M.A.N. V ELP packet on an interface + * that does not have B.A.T.M.A.N. V ELP enabled ? + */ + if (strcmp(bat_priv->algo_ops->name, "BATMAN_V") != 0) + goto free_skb; + + elp_packet = (struct batadv_elp_packet *)skb->data; + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Received ELP packet from %pM seqno %u ORIG: %pM\n", + ethhdr->h_source, ntohl(elp_packet->seqno), + elp_packet->orig); + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + goto free_skb; + + batadv_v_elp_neigh_update(bat_priv, ethhdr->h_source, if_incoming, + elp_packet); + + ret = NET_RX_SUCCESS; + batadv_hardif_put(primary_if); + +free_skb: + if (ret == NET_RX_SUCCESS) + consume_skb(skb); + else + kfree_skb(skb); + + return ret; +} diff --git a/net/batman-adv/bat_v_elp.h b/net/batman-adv/bat_v_elp.h new file mode 100644 index 000000000..9e2740195 --- /dev/null +++ b/net/batman-adv/bat_v_elp.h @@ -0,0 +1,24 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Linus Lüssing, Marek Lindner + */ + +#ifndef _NET_BATMAN_ADV_BAT_V_ELP_H_ +#define _NET_BATMAN_ADV_BAT_V_ELP_H_ + +#include "main.h" + +#include <linux/skbuff.h> +#include <linux/workqueue.h> + +int batadv_v_elp_iface_enable(struct batadv_hard_iface *hard_iface); +void batadv_v_elp_iface_disable(struct batadv_hard_iface *hard_iface); +void batadv_v_elp_iface_activate(struct batadv_hard_iface *primary_iface, + struct batadv_hard_iface *hard_iface); +void batadv_v_elp_primary_iface_set(struct batadv_hard_iface *primary_iface); +int batadv_v_elp_packet_recv(struct sk_buff *skb, + struct batadv_hard_iface *if_incoming); +void batadv_v_elp_throughput_metric_update(struct work_struct *work); + +#endif /* _NET_BATMAN_ADV_BAT_V_ELP_H_ */ diff --git a/net/batman-adv/bat_v_ogm.c b/net/batman-adv/bat_v_ogm.c new file mode 100644 index 000000000..9f4815f4c --- /dev/null +++ b/net/batman-adv/bat_v_ogm.c @@ -0,0 +1,1088 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Antonio Quartulli + */ + +#include "bat_v_ogm.h" +#include "main.h" + +#include <linux/atomic.h> +#include <linux/byteorder/generic.h> +#include <linux/container_of.h> +#include <linux/errno.h> +#include <linux/etherdevice.h> +#include <linux/gfp.h> +#include <linux/if_ether.h> +#include <linux/jiffies.h> +#include <linux/kref.h> +#include <linux/list.h> +#include <linux/lockdep.h> +#include <linux/minmax.h> +#include <linux/mutex.h> +#include <linux/netdevice.h> +#include <linux/prandom.h> +#include <linux/random.h> +#include <linux/rculist.h> +#include <linux/rcupdate.h> +#include <linux/skbuff.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/stddef.h> +#include <linux/string.h> +#include <linux/types.h> +#include <linux/workqueue.h> +#include <uapi/linux/batadv_packet.h> + +#include "bat_algo.h" +#include "hard-interface.h" +#include "hash.h" +#include "log.h" +#include "originator.h" +#include "routing.h" +#include "send.h" +#include "translation-table.h" +#include "tvlv.h" + +/** + * batadv_v_ogm_orig_get() - retrieve and possibly create an originator node + * @bat_priv: the bat priv with all the soft interface information + * @addr: the address of the originator + * + * Return: the orig_node corresponding to the specified address. If such an + * object does not exist, it is allocated here. In case of allocation failure + * returns NULL. + */ +struct batadv_orig_node *batadv_v_ogm_orig_get(struct batadv_priv *bat_priv, + const u8 *addr) +{ + struct batadv_orig_node *orig_node; + int hash_added; + + orig_node = batadv_orig_hash_find(bat_priv, addr); + if (orig_node) + return orig_node; + + orig_node = batadv_orig_node_new(bat_priv, addr); + if (!orig_node) + return NULL; + + kref_get(&orig_node->refcount); + hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig, + batadv_choose_orig, orig_node, + &orig_node->hash_entry); + if (hash_added != 0) { + /* remove refcnt for newly created orig_node and hash entry */ + batadv_orig_node_put(orig_node); + batadv_orig_node_put(orig_node); + orig_node = NULL; + } + + return orig_node; +} + +/** + * batadv_v_ogm_start_queue_timer() - restart the OGM aggregation timer + * @hard_iface: the interface to use to send the OGM + */ +static void batadv_v_ogm_start_queue_timer(struct batadv_hard_iface *hard_iface) +{ + unsigned int msecs = BATADV_MAX_AGGREGATION_MS * 1000; + + /* msecs * [0.9, 1.1] */ + msecs += prandom_u32_max(msecs / 5) - (msecs / 10); + queue_delayed_work(batadv_event_workqueue, &hard_iface->bat_v.aggr_wq, + msecs_to_jiffies(msecs / 1000)); +} + +/** + * batadv_v_ogm_start_timer() - restart the OGM sending timer + * @bat_priv: the bat priv with all the soft interface information + */ +static void batadv_v_ogm_start_timer(struct batadv_priv *bat_priv) +{ + unsigned long msecs; + /* this function may be invoked in different contexts (ogm rescheduling + * or hard_iface activation), but the work timer should not be reset + */ + if (delayed_work_pending(&bat_priv->bat_v.ogm_wq)) + return; + + msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; + msecs += prandom_u32_max(2 * BATADV_JITTER); + queue_delayed_work(batadv_event_workqueue, &bat_priv->bat_v.ogm_wq, + msecs_to_jiffies(msecs)); +} + +/** + * batadv_v_ogm_send_to_if() - send a batman ogm using a given interface + * @skb: the OGM to send + * @hard_iface: the interface to use to send the OGM + */ +static void batadv_v_ogm_send_to_if(struct sk_buff *skb, + struct batadv_hard_iface *hard_iface) +{ + struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); + + if (hard_iface->if_status != BATADV_IF_ACTIVE) { + kfree_skb(skb); + return; + } + + batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); + batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, + skb->len + ETH_HLEN); + + batadv_send_broadcast_skb(skb, hard_iface); +} + +/** + * batadv_v_ogm_len() - OGMv2 packet length + * @skb: the OGM to check + * + * Return: Length of the given OGMv2 packet, including tvlv length, excluding + * ethernet header length. + */ +static unsigned int batadv_v_ogm_len(struct sk_buff *skb) +{ + struct batadv_ogm2_packet *ogm_packet; + + ogm_packet = (struct batadv_ogm2_packet *)skb->data; + return BATADV_OGM2_HLEN + ntohs(ogm_packet->tvlv_len); +} + +/** + * batadv_v_ogm_queue_left() - check if given OGM still fits aggregation queue + * @skb: the OGM to check + * @hard_iface: the interface to use to send the OGM + * + * Caller needs to hold the hard_iface->bat_v.aggr_list.lock. + * + * Return: True, if the given OGMv2 packet still fits, false otherwise. + */ +static bool batadv_v_ogm_queue_left(struct sk_buff *skb, + struct batadv_hard_iface *hard_iface) +{ + unsigned int max = min_t(unsigned int, hard_iface->net_dev->mtu, + BATADV_MAX_AGGREGATION_BYTES); + unsigned int ogm_len = batadv_v_ogm_len(skb); + + lockdep_assert_held(&hard_iface->bat_v.aggr_list.lock); + + return hard_iface->bat_v.aggr_len + ogm_len <= max; +} + +/** + * batadv_v_ogm_aggr_list_free - free all elements in an aggregation queue + * @hard_iface: the interface holding the aggregation queue + * + * Empties the OGMv2 aggregation queue and frees all the skbs it contains. + * + * Caller needs to hold the hard_iface->bat_v.aggr_list.lock. + */ +static void batadv_v_ogm_aggr_list_free(struct batadv_hard_iface *hard_iface) +{ + lockdep_assert_held(&hard_iface->bat_v.aggr_list.lock); + + __skb_queue_purge(&hard_iface->bat_v.aggr_list); + hard_iface->bat_v.aggr_len = 0; +} + +/** + * batadv_v_ogm_aggr_send() - flush & send aggregation queue + * @hard_iface: the interface with the aggregation queue to flush + * + * Aggregates all OGMv2 packets currently in the aggregation queue into a + * single OGMv2 packet and transmits this aggregate. + * + * The aggregation queue is empty after this call. + * + * Caller needs to hold the hard_iface->bat_v.aggr_list.lock. + */ +static void batadv_v_ogm_aggr_send(struct batadv_hard_iface *hard_iface) +{ + unsigned int aggr_len = hard_iface->bat_v.aggr_len; + struct sk_buff *skb_aggr; + unsigned int ogm_len; + struct sk_buff *skb; + + lockdep_assert_held(&hard_iface->bat_v.aggr_list.lock); + + if (!aggr_len) + return; + + skb_aggr = dev_alloc_skb(aggr_len + ETH_HLEN + NET_IP_ALIGN); + if (!skb_aggr) { + batadv_v_ogm_aggr_list_free(hard_iface); + return; + } + + skb_reserve(skb_aggr, ETH_HLEN + NET_IP_ALIGN); + skb_reset_network_header(skb_aggr); + + while ((skb = __skb_dequeue(&hard_iface->bat_v.aggr_list))) { + hard_iface->bat_v.aggr_len -= batadv_v_ogm_len(skb); + + ogm_len = batadv_v_ogm_len(skb); + skb_put_data(skb_aggr, skb->data, ogm_len); + + consume_skb(skb); + } + + batadv_v_ogm_send_to_if(skb_aggr, hard_iface); +} + +/** + * batadv_v_ogm_queue_on_if() - queue a batman ogm on a given interface + * @skb: the OGM to queue + * @hard_iface: the interface to queue the OGM on + */ +static void batadv_v_ogm_queue_on_if(struct sk_buff *skb, + struct batadv_hard_iface *hard_iface) +{ + struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); + + if (!atomic_read(&bat_priv->aggregated_ogms)) { + batadv_v_ogm_send_to_if(skb, hard_iface); + return; + } + + spin_lock_bh(&hard_iface->bat_v.aggr_list.lock); + if (!batadv_v_ogm_queue_left(skb, hard_iface)) + batadv_v_ogm_aggr_send(hard_iface); + + hard_iface->bat_v.aggr_len += batadv_v_ogm_len(skb); + __skb_queue_tail(&hard_iface->bat_v.aggr_list, skb); + spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock); +} + +/** + * batadv_v_ogm_send_softif() - periodic worker broadcasting the own OGM + * @bat_priv: the bat priv with all the soft interface information + */ +static void batadv_v_ogm_send_softif(struct batadv_priv *bat_priv) +{ + struct batadv_hard_iface *hard_iface; + struct batadv_ogm2_packet *ogm_packet; + struct sk_buff *skb, *skb_tmp; + unsigned char *ogm_buff; + int ogm_buff_len; + u16 tvlv_len = 0; + int ret; + + lockdep_assert_held(&bat_priv->bat_v.ogm_buff_mutex); + + if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) + goto out; + + ogm_buff = bat_priv->bat_v.ogm_buff; + ogm_buff_len = bat_priv->bat_v.ogm_buff_len; + /* tt changes have to be committed before the tvlv data is + * appended as it may alter the tt tvlv container + */ + batadv_tt_local_commit_changes(bat_priv); + tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, &ogm_buff, + &ogm_buff_len, + BATADV_OGM2_HLEN); + + bat_priv->bat_v.ogm_buff = ogm_buff; + bat_priv->bat_v.ogm_buff_len = ogm_buff_len; + + skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + ogm_buff_len); + if (!skb) + goto reschedule; + + skb_reserve(skb, ETH_HLEN); + skb_put_data(skb, ogm_buff, ogm_buff_len); + + ogm_packet = (struct batadv_ogm2_packet *)skb->data; + ogm_packet->seqno = htonl(atomic_read(&bat_priv->bat_v.ogm_seqno)); + atomic_inc(&bat_priv->bat_v.ogm_seqno); + ogm_packet->tvlv_len = htons(tvlv_len); + + /* broadcast on every interface */ + rcu_read_lock(); + list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { + if (hard_iface->soft_iface != bat_priv->soft_iface) + continue; + + if (!kref_get_unless_zero(&hard_iface->refcount)) + continue; + + ret = batadv_hardif_no_broadcast(hard_iface, NULL, NULL); + if (ret) { + char *type; + + switch (ret) { + case BATADV_HARDIF_BCAST_NORECIPIENT: + type = "no neighbor"; + break; + case BATADV_HARDIF_BCAST_DUPFWD: + type = "single neighbor is source"; + break; + case BATADV_HARDIF_BCAST_DUPORIG: + type = "single neighbor is originator"; + break; + default: + type = "unknown"; + } + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "OGM2 from ourselves on %s suppressed: %s\n", + hard_iface->net_dev->name, type); + + batadv_hardif_put(hard_iface); + continue; + } + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Sending own OGM2 packet (originator %pM, seqno %u, throughput %u, TTL %d) on interface %s [%pM]\n", + ogm_packet->orig, ntohl(ogm_packet->seqno), + ntohl(ogm_packet->throughput), ogm_packet->ttl, + hard_iface->net_dev->name, + hard_iface->net_dev->dev_addr); + + /* this skb gets consumed by batadv_v_ogm_send_to_if() */ + skb_tmp = skb_clone(skb, GFP_ATOMIC); + if (!skb_tmp) { + batadv_hardif_put(hard_iface); + break; + } + + batadv_v_ogm_queue_on_if(skb_tmp, hard_iface); + batadv_hardif_put(hard_iface); + } + rcu_read_unlock(); + + consume_skb(skb); + +reschedule: + batadv_v_ogm_start_timer(bat_priv); +out: + return; +} + +/** + * batadv_v_ogm_send() - periodic worker broadcasting the own OGM + * @work: work queue item + */ +static void batadv_v_ogm_send(struct work_struct *work) +{ + struct batadv_priv_bat_v *bat_v; + struct batadv_priv *bat_priv; + + bat_v = container_of(work, struct batadv_priv_bat_v, ogm_wq.work); + bat_priv = container_of(bat_v, struct batadv_priv, bat_v); + + mutex_lock(&bat_priv->bat_v.ogm_buff_mutex); + batadv_v_ogm_send_softif(bat_priv); + mutex_unlock(&bat_priv->bat_v.ogm_buff_mutex); +} + +/** + * batadv_v_ogm_aggr_work() - OGM queue periodic task per interface + * @work: work queue item + * + * Emits aggregated OGM messages in regular intervals. + */ +void batadv_v_ogm_aggr_work(struct work_struct *work) +{ + struct batadv_hard_iface_bat_v *batv; + struct batadv_hard_iface *hard_iface; + + batv = container_of(work, struct batadv_hard_iface_bat_v, aggr_wq.work); + hard_iface = container_of(batv, struct batadv_hard_iface, bat_v); + + spin_lock_bh(&hard_iface->bat_v.aggr_list.lock); + batadv_v_ogm_aggr_send(hard_iface); + spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock); + + batadv_v_ogm_start_queue_timer(hard_iface); +} + +/** + * batadv_v_ogm_iface_enable() - prepare an interface for B.A.T.M.A.N. V + * @hard_iface: the interface to prepare + * + * Takes care of scheduling its own OGM sending routine for this interface. + * + * Return: 0 on success or a negative error code otherwise + */ +int batadv_v_ogm_iface_enable(struct batadv_hard_iface *hard_iface) +{ + struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); + + batadv_v_ogm_start_queue_timer(hard_iface); + batadv_v_ogm_start_timer(bat_priv); + + return 0; +} + +/** + * batadv_v_ogm_iface_disable() - release OGM interface private resources + * @hard_iface: interface for which the resources have to be released + */ +void batadv_v_ogm_iface_disable(struct batadv_hard_iface *hard_iface) +{ + cancel_delayed_work_sync(&hard_iface->bat_v.aggr_wq); + + spin_lock_bh(&hard_iface->bat_v.aggr_list.lock); + batadv_v_ogm_aggr_list_free(hard_iface); + spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock); +} + +/** + * batadv_v_ogm_primary_iface_set() - set a new primary interface + * @primary_iface: the new primary interface + */ +void batadv_v_ogm_primary_iface_set(struct batadv_hard_iface *primary_iface) +{ + struct batadv_priv *bat_priv = netdev_priv(primary_iface->soft_iface); + struct batadv_ogm2_packet *ogm_packet; + + mutex_lock(&bat_priv->bat_v.ogm_buff_mutex); + if (!bat_priv->bat_v.ogm_buff) + goto unlock; + + ogm_packet = (struct batadv_ogm2_packet *)bat_priv->bat_v.ogm_buff; + ether_addr_copy(ogm_packet->orig, primary_iface->net_dev->dev_addr); + +unlock: + mutex_unlock(&bat_priv->bat_v.ogm_buff_mutex); +} + +/** + * batadv_v_forward_penalty() - apply a penalty to the throughput metric + * forwarded with B.A.T.M.A.N. V OGMs + * @bat_priv: the bat priv with all the soft interface information + * @if_incoming: the interface where the OGM has been received + * @if_outgoing: the interface where the OGM has to be forwarded to + * @throughput: the current throughput + * + * Apply a penalty on the current throughput metric value based on the + * characteristic of the interface where the OGM has been received. + * + * Initially the per hardif hop penalty is applied to the throughput. After + * that the return value is then computed as follows: + * - throughput * 50% if the incoming and outgoing interface are the + * same WiFi interface and the throughput is above + * 1MBit/s + * - throughput if the outgoing interface is the default + * interface (i.e. this OGM is processed for the + * internal table and not forwarded) + * - throughput * node hop penalty otherwise + * + * Return: the penalised throughput metric. + */ +static u32 batadv_v_forward_penalty(struct batadv_priv *bat_priv, + struct batadv_hard_iface *if_incoming, + struct batadv_hard_iface *if_outgoing, + u32 throughput) +{ + int if_hop_penalty = atomic_read(&if_incoming->hop_penalty); + int hop_penalty = atomic_read(&bat_priv->hop_penalty); + int hop_penalty_max = BATADV_TQ_MAX_VALUE; + + /* Apply per hardif hop penalty */ + throughput = throughput * (hop_penalty_max - if_hop_penalty) / + hop_penalty_max; + + /* Don't apply hop penalty in default originator table. */ + if (if_outgoing == BATADV_IF_DEFAULT) + return throughput; + + /* Forwarding on the same WiFi interface cuts the throughput in half + * due to the store & forward characteristics of WIFI. + * Very low throughput values are the exception. + */ + if (throughput > 10 && + if_incoming == if_outgoing && + !(if_incoming->bat_v.flags & BATADV_FULL_DUPLEX)) + return throughput / 2; + + /* hop penalty of 255 equals 100% */ + return throughput * (hop_penalty_max - hop_penalty) / hop_penalty_max; +} + +/** + * batadv_v_ogm_forward() - check conditions and forward an OGM to the given + * outgoing interface + * @bat_priv: the bat priv with all the soft interface information + * @ogm_received: previously received OGM to be forwarded + * @orig_node: the originator which has been updated + * @neigh_node: the neigh_node through with the OGM has been received + * @if_incoming: the interface on which this OGM was received on + * @if_outgoing: the interface to which the OGM has to be forwarded to + * + * Forward an OGM to an interface after having altered the throughput metric and + * the TTL value contained in it. The original OGM isn't modified. + */ +static void batadv_v_ogm_forward(struct batadv_priv *bat_priv, + const struct batadv_ogm2_packet *ogm_received, + struct batadv_orig_node *orig_node, + struct batadv_neigh_node *neigh_node, + struct batadv_hard_iface *if_incoming, + struct batadv_hard_iface *if_outgoing) +{ + struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; + struct batadv_orig_ifinfo *orig_ifinfo = NULL; + struct batadv_neigh_node *router = NULL; + struct batadv_ogm2_packet *ogm_forward; + unsigned char *skb_buff; + struct sk_buff *skb; + size_t packet_len; + u16 tvlv_len; + + /* only forward for specific interfaces, not for the default one. */ + if (if_outgoing == BATADV_IF_DEFAULT) + goto out; + + orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); + if (!orig_ifinfo) + goto out; + + /* acquire possibly updated router */ + router = batadv_orig_router_get(orig_node, if_outgoing); + + /* strict rule: forward packets coming from the best next hop only */ + if (neigh_node != router) + goto out; + + /* don't forward the same seqno twice on one interface */ + if (orig_ifinfo->last_seqno_forwarded == ntohl(ogm_received->seqno)) + goto out; + + orig_ifinfo->last_seqno_forwarded = ntohl(ogm_received->seqno); + + if (ogm_received->ttl <= 1) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n"); + goto out; + } + + neigh_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); + if (!neigh_ifinfo) + goto out; + + tvlv_len = ntohs(ogm_received->tvlv_len); + + packet_len = BATADV_OGM2_HLEN + tvlv_len; + skb = netdev_alloc_skb_ip_align(if_outgoing->net_dev, + ETH_HLEN + packet_len); + if (!skb) + goto out; + + skb_reserve(skb, ETH_HLEN); + skb_buff = skb_put_data(skb, ogm_received, packet_len); + + /* apply forward penalty */ + ogm_forward = (struct batadv_ogm2_packet *)skb_buff; + ogm_forward->throughput = htonl(neigh_ifinfo->bat_v.throughput); + ogm_forward->ttl--; + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Forwarding OGM2 packet on %s: throughput %u, ttl %u, received via %s\n", + if_outgoing->net_dev->name, ntohl(ogm_forward->throughput), + ogm_forward->ttl, if_incoming->net_dev->name); + + batadv_v_ogm_queue_on_if(skb, if_outgoing); + +out: + batadv_orig_ifinfo_put(orig_ifinfo); + batadv_neigh_node_put(router); + batadv_neigh_ifinfo_put(neigh_ifinfo); +} + +/** + * batadv_v_ogm_metric_update() - update route metric based on OGM + * @bat_priv: the bat priv with all the soft interface information + * @ogm2: OGM2 structure + * @orig_node: Originator structure for which the OGM has been received + * @neigh_node: the neigh_node through with the OGM has been received + * @if_incoming: the interface where this packet was received + * @if_outgoing: the interface for which the packet should be considered + * + * Return: + * 1 if the OGM is new, + * 0 if it is not new but valid, + * <0 on error (e.g. old OGM) + */ +static int batadv_v_ogm_metric_update(struct batadv_priv *bat_priv, + const struct batadv_ogm2_packet *ogm2, + struct batadv_orig_node *orig_node, + struct batadv_neigh_node *neigh_node, + struct batadv_hard_iface *if_incoming, + struct batadv_hard_iface *if_outgoing) +{ + struct batadv_orig_ifinfo *orig_ifinfo; + struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; + bool protection_started = false; + int ret = -EINVAL; + u32 path_throughput; + s32 seq_diff; + + orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); + if (!orig_ifinfo) + goto out; + + seq_diff = ntohl(ogm2->seqno) - orig_ifinfo->last_real_seqno; + + if (!hlist_empty(&orig_node->neigh_list) && + batadv_window_protected(bat_priv, seq_diff, + BATADV_OGM_MAX_AGE, + &orig_ifinfo->batman_seqno_reset, + &protection_started)) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Drop packet: packet within window protection time from %pM\n", + ogm2->orig); + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Last reset: %ld, %ld\n", + orig_ifinfo->batman_seqno_reset, jiffies); + goto out; + } + + /* drop packets with old seqnos, however accept the first packet after + * a host has been rebooted. + */ + if (seq_diff < 0 && !protection_started) + goto out; + + neigh_node->last_seen = jiffies; + + orig_node->last_seen = jiffies; + + orig_ifinfo->last_real_seqno = ntohl(ogm2->seqno); + orig_ifinfo->last_ttl = ogm2->ttl; + + neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); + if (!neigh_ifinfo) + goto out; + + path_throughput = batadv_v_forward_penalty(bat_priv, if_incoming, + if_outgoing, + ntohl(ogm2->throughput)); + neigh_ifinfo->bat_v.throughput = path_throughput; + neigh_ifinfo->bat_v.last_seqno = ntohl(ogm2->seqno); + neigh_ifinfo->last_ttl = ogm2->ttl; + + if (seq_diff > 0 || protection_started) + ret = 1; + else + ret = 0; +out: + batadv_orig_ifinfo_put(orig_ifinfo); + batadv_neigh_ifinfo_put(neigh_ifinfo); + + return ret; +} + +/** + * batadv_v_ogm_route_update() - update routes based on OGM + * @bat_priv: the bat priv with all the soft interface information + * @ethhdr: the Ethernet header of the OGM2 + * @ogm2: OGM2 structure + * @orig_node: Originator structure for which the OGM has been received + * @neigh_node: the neigh_node through with the OGM has been received + * @if_incoming: the interface where this packet was received + * @if_outgoing: the interface for which the packet should be considered + * + * Return: true if the packet should be forwarded, false otherwise + */ +static bool batadv_v_ogm_route_update(struct batadv_priv *bat_priv, + const struct ethhdr *ethhdr, + const struct batadv_ogm2_packet *ogm2, + struct batadv_orig_node *orig_node, + struct batadv_neigh_node *neigh_node, + struct batadv_hard_iface *if_incoming, + struct batadv_hard_iface *if_outgoing) +{ + struct batadv_neigh_node *router = NULL; + struct batadv_orig_node *orig_neigh_node; + struct batadv_neigh_node *orig_neigh_router = NULL; + struct batadv_neigh_ifinfo *router_ifinfo = NULL, *neigh_ifinfo = NULL; + u32 router_throughput, neigh_throughput; + u32 router_last_seqno; + u32 neigh_last_seqno; + s32 neigh_seq_diff; + bool forward = false; + + orig_neigh_node = batadv_v_ogm_orig_get(bat_priv, ethhdr->h_source); + if (!orig_neigh_node) + goto out; + + orig_neigh_router = batadv_orig_router_get(orig_neigh_node, + if_outgoing); + + /* drop packet if sender is not a direct neighbor and if we + * don't route towards it + */ + router = batadv_orig_router_get(orig_node, if_outgoing); + if (router && router->orig_node != orig_node && !orig_neigh_router) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Drop packet: OGM via unknown neighbor!\n"); + goto out; + } + + /* Mark the OGM to be considered for forwarding, and update routes + * if needed. + */ + forward = true; + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Searching and updating originator entry of received packet\n"); + + /* if this neighbor already is our next hop there is nothing + * to change + */ + if (router == neigh_node) + goto out; + + /* don't consider neighbours with worse throughput. + * also switch route if this seqno is BATADV_V_MAX_ORIGDIFF newer than + * the last received seqno from our best next hop. + */ + if (router) { + router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); + neigh_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); + + /* if these are not allocated, something is wrong. */ + if (!router_ifinfo || !neigh_ifinfo) + goto out; + + neigh_last_seqno = neigh_ifinfo->bat_v.last_seqno; + router_last_seqno = router_ifinfo->bat_v.last_seqno; + neigh_seq_diff = neigh_last_seqno - router_last_seqno; + router_throughput = router_ifinfo->bat_v.throughput; + neigh_throughput = neigh_ifinfo->bat_v.throughput; + + if (neigh_seq_diff < BATADV_OGM_MAX_ORIGDIFF && + router_throughput >= neigh_throughput) + goto out; + } + + batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node); +out: + batadv_neigh_node_put(router); + batadv_neigh_node_put(orig_neigh_router); + batadv_orig_node_put(orig_neigh_node); + batadv_neigh_ifinfo_put(router_ifinfo); + batadv_neigh_ifinfo_put(neigh_ifinfo); + + return forward; +} + +/** + * batadv_v_ogm_process_per_outif() - process a batman v OGM for an outgoing if + * @bat_priv: the bat priv with all the soft interface information + * @ethhdr: the Ethernet header of the OGM2 + * @ogm2: OGM2 structure + * @orig_node: Originator structure for which the OGM has been received + * @neigh_node: the neigh_node through with the OGM has been received + * @if_incoming: the interface where this packet was received + * @if_outgoing: the interface for which the packet should be considered + */ +static void +batadv_v_ogm_process_per_outif(struct batadv_priv *bat_priv, + const struct ethhdr *ethhdr, + const struct batadv_ogm2_packet *ogm2, + struct batadv_orig_node *orig_node, + struct batadv_neigh_node *neigh_node, + struct batadv_hard_iface *if_incoming, + struct batadv_hard_iface *if_outgoing) +{ + int seqno_age; + bool forward; + + /* first, update the metric with according sanity checks */ + seqno_age = batadv_v_ogm_metric_update(bat_priv, ogm2, orig_node, + neigh_node, if_incoming, + if_outgoing); + + /* outdated sequence numbers are to be discarded */ + if (seqno_age < 0) + return; + + /* only unknown & newer OGMs contain TVLVs we are interested in */ + if (seqno_age > 0 && if_outgoing == BATADV_IF_DEFAULT) + batadv_tvlv_containers_process(bat_priv, true, orig_node, + NULL, NULL, + (unsigned char *)(ogm2 + 1), + ntohs(ogm2->tvlv_len)); + + /* if the metric update went through, update routes if needed */ + forward = batadv_v_ogm_route_update(bat_priv, ethhdr, ogm2, orig_node, + neigh_node, if_incoming, + if_outgoing); + + /* if the routes have been processed correctly, check and forward */ + if (forward) + batadv_v_ogm_forward(bat_priv, ogm2, orig_node, neigh_node, + if_incoming, if_outgoing); +} + +/** + * batadv_v_ogm_aggr_packet() - checks if there is another OGM aggregated + * @buff_pos: current position in the skb + * @packet_len: total length of the skb + * @ogm2_packet: potential OGM2 in buffer + * + * Return: true if there is enough space for another OGM, false otherwise. + */ +static bool +batadv_v_ogm_aggr_packet(int buff_pos, int packet_len, + const struct batadv_ogm2_packet *ogm2_packet) +{ + int next_buff_pos = 0; + + /* check if there is enough space for the header */ + next_buff_pos += buff_pos + sizeof(*ogm2_packet); + if (next_buff_pos > packet_len) + return false; + + /* check if there is enough space for the optional TVLV */ + next_buff_pos += ntohs(ogm2_packet->tvlv_len); + + return (next_buff_pos <= packet_len) && + (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); +} + +/** + * batadv_v_ogm_process() - process an incoming batman v OGM + * @skb: the skb containing the OGM + * @ogm_offset: offset to the OGM which should be processed (for aggregates) + * @if_incoming: the interface where this packet was received + */ +static void batadv_v_ogm_process(const struct sk_buff *skb, int ogm_offset, + struct batadv_hard_iface *if_incoming) +{ + struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); + struct ethhdr *ethhdr; + struct batadv_orig_node *orig_node = NULL; + struct batadv_hardif_neigh_node *hardif_neigh = NULL; + struct batadv_neigh_node *neigh_node = NULL; + struct batadv_hard_iface *hard_iface; + struct batadv_ogm2_packet *ogm_packet; + u32 ogm_throughput, link_throughput, path_throughput; + int ret; + + ethhdr = eth_hdr(skb); + ogm_packet = (struct batadv_ogm2_packet *)(skb->data + ogm_offset); + + ogm_throughput = ntohl(ogm_packet->throughput); + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Received OGM2 packet via NB: %pM, IF: %s [%pM] (from OG: %pM, seqno %u, throughput %u, TTL %u, V %u, tvlv_len %u)\n", + ethhdr->h_source, if_incoming->net_dev->name, + if_incoming->net_dev->dev_addr, ogm_packet->orig, + ntohl(ogm_packet->seqno), ogm_throughput, ogm_packet->ttl, + ogm_packet->version, ntohs(ogm_packet->tvlv_len)); + + if (batadv_is_my_mac(bat_priv, ogm_packet->orig)) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Drop packet: originator packet from ourself\n"); + return; + } + + /* If the throughput metric is 0, immediately drop the packet. No need + * to create orig_node / neigh_node for an unusable route. + */ + if (ogm_throughput == 0) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Drop packet: originator packet with throughput metric of 0\n"); + return; + } + + /* require ELP packets be to received from this neighbor first */ + hardif_neigh = batadv_hardif_neigh_get(if_incoming, ethhdr->h_source); + if (!hardif_neigh) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Drop packet: OGM via unknown neighbor!\n"); + goto out; + } + + orig_node = batadv_v_ogm_orig_get(bat_priv, ogm_packet->orig); + if (!orig_node) + goto out; + + neigh_node = batadv_neigh_node_get_or_create(orig_node, if_incoming, + ethhdr->h_source); + if (!neigh_node) + goto out; + + /* Update the received throughput metric to match the link + * characteristic: + * - If this OGM traveled one hop so far (emitted by single hop + * neighbor) the path throughput metric equals the link throughput. + * - For OGMs traversing more than hop the path throughput metric is + * the smaller of the path throughput and the link throughput. + */ + link_throughput = ewma_throughput_read(&hardif_neigh->bat_v.throughput); + path_throughput = min_t(u32, link_throughput, ogm_throughput); + ogm_packet->throughput = htonl(path_throughput); + + batadv_v_ogm_process_per_outif(bat_priv, ethhdr, ogm_packet, orig_node, + neigh_node, if_incoming, + BATADV_IF_DEFAULT); + + rcu_read_lock(); + list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { + if (hard_iface->if_status != BATADV_IF_ACTIVE) + continue; + + if (hard_iface->soft_iface != bat_priv->soft_iface) + continue; + + if (!kref_get_unless_zero(&hard_iface->refcount)) + continue; + + ret = batadv_hardif_no_broadcast(hard_iface, + ogm_packet->orig, + hardif_neigh->orig); + + if (ret) { + char *type; + + switch (ret) { + case BATADV_HARDIF_BCAST_NORECIPIENT: + type = "no neighbor"; + break; + case BATADV_HARDIF_BCAST_DUPFWD: + type = "single neighbor is source"; + break; + case BATADV_HARDIF_BCAST_DUPORIG: + type = "single neighbor is originator"; + break; + default: + type = "unknown"; + } + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "OGM2 packet from %pM on %s suppressed: %s\n", + ogm_packet->orig, hard_iface->net_dev->name, + type); + + batadv_hardif_put(hard_iface); + continue; + } + + batadv_v_ogm_process_per_outif(bat_priv, ethhdr, ogm_packet, + orig_node, neigh_node, + if_incoming, hard_iface); + + batadv_hardif_put(hard_iface); + } + rcu_read_unlock(); +out: + batadv_orig_node_put(orig_node); + batadv_neigh_node_put(neigh_node); + batadv_hardif_neigh_put(hardif_neigh); +} + +/** + * batadv_v_ogm_packet_recv() - OGM2 receiving handler + * @skb: the received OGM + * @if_incoming: the interface where this OGM has been received + * + * Return: NET_RX_SUCCESS and consume the skb on success or returns NET_RX_DROP + * (without freeing the skb) on failure + */ +int batadv_v_ogm_packet_recv(struct sk_buff *skb, + struct batadv_hard_iface *if_incoming) +{ + struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); + struct batadv_ogm2_packet *ogm_packet; + struct ethhdr *ethhdr; + int ogm_offset; + u8 *packet_pos; + int ret = NET_RX_DROP; + + /* did we receive a OGM2 packet on an interface that does not have + * B.A.T.M.A.N. V enabled ? + */ + if (strcmp(bat_priv->algo_ops->name, "BATMAN_V") != 0) + goto free_skb; + + if (!batadv_check_management_packet(skb, if_incoming, BATADV_OGM2_HLEN)) + goto free_skb; + + ethhdr = eth_hdr(skb); + if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) + goto free_skb; + + batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); + batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, + skb->len + ETH_HLEN); + + ogm_offset = 0; + ogm_packet = (struct batadv_ogm2_packet *)skb->data; + + while (batadv_v_ogm_aggr_packet(ogm_offset, skb_headlen(skb), + ogm_packet)) { + batadv_v_ogm_process(skb, ogm_offset, if_incoming); + + ogm_offset += BATADV_OGM2_HLEN; + ogm_offset += ntohs(ogm_packet->tvlv_len); + + packet_pos = skb->data + ogm_offset; + ogm_packet = (struct batadv_ogm2_packet *)packet_pos; + } + + ret = NET_RX_SUCCESS; + +free_skb: + if (ret == NET_RX_SUCCESS) + consume_skb(skb); + else + kfree_skb(skb); + + return ret; +} + +/** + * batadv_v_ogm_init() - initialise the OGM2 engine + * @bat_priv: the bat priv with all the soft interface information + * + * Return: 0 on success or a negative error code in case of failure + */ +int batadv_v_ogm_init(struct batadv_priv *bat_priv) +{ + struct batadv_ogm2_packet *ogm_packet; + unsigned char *ogm_buff; + u32 random_seqno; + + bat_priv->bat_v.ogm_buff_len = BATADV_OGM2_HLEN; + ogm_buff = kzalloc(bat_priv->bat_v.ogm_buff_len, GFP_ATOMIC); + if (!ogm_buff) + return -ENOMEM; + + bat_priv->bat_v.ogm_buff = ogm_buff; + ogm_packet = (struct batadv_ogm2_packet *)ogm_buff; + ogm_packet->packet_type = BATADV_OGM2; + ogm_packet->version = BATADV_COMPAT_VERSION; + ogm_packet->ttl = BATADV_TTL; + ogm_packet->flags = BATADV_NO_FLAGS; + ogm_packet->throughput = htonl(BATADV_THROUGHPUT_MAX_VALUE); + + /* randomize initial seqno to avoid collision */ + get_random_bytes(&random_seqno, sizeof(random_seqno)); + atomic_set(&bat_priv->bat_v.ogm_seqno, random_seqno); + INIT_DELAYED_WORK(&bat_priv->bat_v.ogm_wq, batadv_v_ogm_send); + + mutex_init(&bat_priv->bat_v.ogm_buff_mutex); + + return 0; +} + +/** + * batadv_v_ogm_free() - free OGM private resources + * @bat_priv: the bat priv with all the soft interface information + */ +void batadv_v_ogm_free(struct batadv_priv *bat_priv) +{ + cancel_delayed_work_sync(&bat_priv->bat_v.ogm_wq); + + mutex_lock(&bat_priv->bat_v.ogm_buff_mutex); + + kfree(bat_priv->bat_v.ogm_buff); + bat_priv->bat_v.ogm_buff = NULL; + bat_priv->bat_v.ogm_buff_len = 0; + + mutex_unlock(&bat_priv->bat_v.ogm_buff_mutex); +} diff --git a/net/batman-adv/bat_v_ogm.h b/net/batman-adv/bat_v_ogm.h new file mode 100644 index 000000000..edeffedec --- /dev/null +++ b/net/batman-adv/bat_v_ogm.h @@ -0,0 +1,27 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Antonio Quartulli + */ + +#ifndef _NET_BATMAN_ADV_BAT_V_OGM_H_ +#define _NET_BATMAN_ADV_BAT_V_OGM_H_ + +#include "main.h" + +#include <linux/skbuff.h> +#include <linux/types.h> +#include <linux/workqueue.h> + +int batadv_v_ogm_init(struct batadv_priv *bat_priv); +void batadv_v_ogm_free(struct batadv_priv *bat_priv); +void batadv_v_ogm_aggr_work(struct work_struct *work); +int batadv_v_ogm_iface_enable(struct batadv_hard_iface *hard_iface); +void batadv_v_ogm_iface_disable(struct batadv_hard_iface *hard_iface); +struct batadv_orig_node *batadv_v_ogm_orig_get(struct batadv_priv *bat_priv, + const u8 *addr); +void batadv_v_ogm_primary_iface_set(struct batadv_hard_iface *primary_iface); +int batadv_v_ogm_packet_recv(struct sk_buff *skb, + struct batadv_hard_iface *if_incoming); + +#endif /* _NET_BATMAN_ADV_BAT_V_OGM_H_ */ diff --git a/net/batman-adv/bitarray.c b/net/batman-adv/bitarray.c new file mode 100644 index 000000000..649c41f39 --- /dev/null +++ b/net/batman-adv/bitarray.c @@ -0,0 +1,89 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Simon Wunderlich, Marek Lindner + */ + +#include "bitarray.h" +#include "main.h" + +#include <linux/bitmap.h> + +#include "log.h" + +/* shift the packet array by n places. */ +static void batadv_bitmap_shift_left(unsigned long *seq_bits, s32 n) +{ + if (n <= 0 || n >= BATADV_TQ_LOCAL_WINDOW_SIZE) + return; + + bitmap_shift_left(seq_bits, seq_bits, n, BATADV_TQ_LOCAL_WINDOW_SIZE); +} + +/** + * batadv_bit_get_packet() - receive and process one packet within the sequence + * number window + * @priv: the bat priv with all the soft interface information + * @seq_bits: pointer to the sequence number receive packet + * @seq_num_diff: difference between the current/received sequence number and + * the last sequence number + * @set_mark: whether this packet should be marked in seq_bits + * + * Return: true if the window was moved (either new or very old), + * false if the window was not moved/shifted. + */ +bool batadv_bit_get_packet(void *priv, unsigned long *seq_bits, + s32 seq_num_diff, int set_mark) +{ + struct batadv_priv *bat_priv = priv; + + /* sequence number is slightly older. We already got a sequence number + * higher than this one, so we just mark it. + */ + if (seq_num_diff <= 0 && seq_num_diff > -BATADV_TQ_LOCAL_WINDOW_SIZE) { + if (set_mark) + batadv_set_bit(seq_bits, -seq_num_diff); + return false; + } + + /* sequence number is slightly newer, so we shift the window and + * set the mark if required + */ + if (seq_num_diff > 0 && seq_num_diff < BATADV_TQ_LOCAL_WINDOW_SIZE) { + batadv_bitmap_shift_left(seq_bits, seq_num_diff); + + if (set_mark) + batadv_set_bit(seq_bits, 0); + return true; + } + + /* sequence number is much newer, probably missed a lot of packets */ + if (seq_num_diff >= BATADV_TQ_LOCAL_WINDOW_SIZE && + seq_num_diff < BATADV_EXPECTED_SEQNO_RANGE) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "We missed a lot of packets (%i) !\n", + seq_num_diff - 1); + bitmap_zero(seq_bits, BATADV_TQ_LOCAL_WINDOW_SIZE); + if (set_mark) + batadv_set_bit(seq_bits, 0); + return true; + } + + /* received a much older packet. The other host either restarted + * or the old packet got delayed somewhere in the network. The + * packet should be dropped without calling this function if the + * seqno window is protected. + * + * seq_num_diff <= -BATADV_TQ_LOCAL_WINDOW_SIZE + * or + * seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE + */ + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Other host probably restarted!\n"); + + bitmap_zero(seq_bits, BATADV_TQ_LOCAL_WINDOW_SIZE); + if (set_mark) + batadv_set_bit(seq_bits, 0); + + return true; +} diff --git a/net/batman-adv/bitarray.h b/net/batman-adv/bitarray.h new file mode 100644 index 000000000..37f7ae413 --- /dev/null +++ b/net/batman-adv/bitarray.h @@ -0,0 +1,56 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Simon Wunderlich, Marek Lindner + */ + +#ifndef _NET_BATMAN_ADV_BITARRAY_H_ +#define _NET_BATMAN_ADV_BITARRAY_H_ + +#include "main.h" + +#include <linux/bitops.h> +#include <linux/compiler.h> +#include <linux/stddef.h> +#include <linux/types.h> + +/** + * batadv_test_bit() - check if bit is set in the current window + * + * @seq_bits: pointer to the sequence number receive packet + * @last_seqno: latest sequence number in seq_bits + * @curr_seqno: sequence number to test for + * + * Return: true if the corresponding bit in the given seq_bits indicates true + * and curr_seqno is within range of last_seqno. Otherwise returns false. + */ +static inline bool batadv_test_bit(const unsigned long *seq_bits, + u32 last_seqno, u32 curr_seqno) +{ + s32 diff; + + diff = last_seqno - curr_seqno; + if (diff < 0 || diff >= BATADV_TQ_LOCAL_WINDOW_SIZE) + return false; + return test_bit(diff, seq_bits) != 0; +} + +/** + * batadv_set_bit() - Turn corresponding bit on, so we can remember that we got + * the packet + * @seq_bits: bitmap of the packet receive window + * @n: relative sequence number of newly received packet + */ +static inline void batadv_set_bit(unsigned long *seq_bits, s32 n) +{ + /* if too old, just drop it */ + if (n < 0 || n >= BATADV_TQ_LOCAL_WINDOW_SIZE) + return; + + set_bit(n, seq_bits); /* turn the position on */ +} + +bool batadv_bit_get_packet(void *priv, unsigned long *seq_bits, + s32 seq_num_diff, int set_mark); + +#endif /* _NET_BATMAN_ADV_BITARRAY_H_ */ diff --git a/net/batman-adv/bridge_loop_avoidance.c b/net/batman-adv/bridge_loop_avoidance.c new file mode 100644 index 000000000..37ce6cfb3 --- /dev/null +++ b/net/batman-adv/bridge_loop_avoidance.c @@ -0,0 +1,2502 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Simon Wunderlich + */ + +#include "bridge_loop_avoidance.h" +#include "main.h" + +#include <linux/atomic.h> +#include <linux/byteorder/generic.h> +#include <linux/compiler.h> +#include <linux/container_of.h> +#include <linux/crc16.h> +#include <linux/errno.h> +#include <linux/etherdevice.h> +#include <linux/gfp.h> +#include <linux/if_arp.h> +#include <linux/if_ether.h> +#include <linux/if_vlan.h> +#include <linux/jhash.h> +#include <linux/jiffies.h> +#include <linux/kernel.h> +#include <linux/kref.h> +#include <linux/list.h> +#include <linux/lockdep.h> +#include <linux/netdevice.h> +#include <linux/netlink.h> +#include <linux/rculist.h> +#include <linux/rcupdate.h> +#include <linux/skbuff.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/stddef.h> +#include <linux/string.h> +#include <linux/workqueue.h> +#include <net/arp.h> +#include <net/genetlink.h> +#include <net/netlink.h> +#include <net/sock.h> +#include <uapi/linux/batadv_packet.h> +#include <uapi/linux/batman_adv.h> + +#include "hard-interface.h" +#include "hash.h" +#include "log.h" +#include "netlink.h" +#include "originator.h" +#include "soft-interface.h" +#include "translation-table.h" + +static const u8 batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05}; + +static void batadv_bla_periodic_work(struct work_struct *work); +static void +batadv_bla_send_announce(struct batadv_priv *bat_priv, + struct batadv_bla_backbone_gw *backbone_gw); + +/** + * batadv_choose_claim() - choose the right bucket for a claim. + * @data: data to hash + * @size: size of the hash table + * + * Return: the hash index of the claim + */ +static inline u32 batadv_choose_claim(const void *data, u32 size) +{ + const struct batadv_bla_claim *claim = data; + u32 hash = 0; + + hash = jhash(&claim->addr, sizeof(claim->addr), hash); + hash = jhash(&claim->vid, sizeof(claim->vid), hash); + + return hash % size; +} + +/** + * batadv_choose_backbone_gw() - choose the right bucket for a backbone gateway. + * @data: data to hash + * @size: size of the hash table + * + * Return: the hash index of the backbone gateway + */ +static inline u32 batadv_choose_backbone_gw(const void *data, u32 size) +{ + const struct batadv_bla_backbone_gw *gw; + u32 hash = 0; + + gw = data; + hash = jhash(&gw->orig, sizeof(gw->orig), hash); + hash = jhash(&gw->vid, sizeof(gw->vid), hash); + + return hash % size; +} + +/** + * batadv_compare_backbone_gw() - compare address and vid of two backbone gws + * @node: list node of the first entry to compare + * @data2: pointer to the second backbone gateway + * + * Return: true if the backbones have the same data, false otherwise + */ +static bool batadv_compare_backbone_gw(const struct hlist_node *node, + const void *data2) +{ + const void *data1 = container_of(node, struct batadv_bla_backbone_gw, + hash_entry); + const struct batadv_bla_backbone_gw *gw1 = data1; + const struct batadv_bla_backbone_gw *gw2 = data2; + + if (!batadv_compare_eth(gw1->orig, gw2->orig)) + return false; + + if (gw1->vid != gw2->vid) + return false; + + return true; +} + +/** + * batadv_compare_claim() - compare address and vid of two claims + * @node: list node of the first entry to compare + * @data2: pointer to the second claims + * + * Return: true if the claim have the same data, 0 otherwise + */ +static bool batadv_compare_claim(const struct hlist_node *node, + const void *data2) +{ + const void *data1 = container_of(node, struct batadv_bla_claim, + hash_entry); + const struct batadv_bla_claim *cl1 = data1; + const struct batadv_bla_claim *cl2 = data2; + + if (!batadv_compare_eth(cl1->addr, cl2->addr)) + return false; + + if (cl1->vid != cl2->vid) + return false; + + return true; +} + +/** + * batadv_backbone_gw_release() - release backbone gw from lists and queue for + * free after rcu grace period + * @ref: kref pointer of the backbone gw + */ +static void batadv_backbone_gw_release(struct kref *ref) +{ + struct batadv_bla_backbone_gw *backbone_gw; + + backbone_gw = container_of(ref, struct batadv_bla_backbone_gw, + refcount); + + kfree_rcu(backbone_gw, rcu); +} + +/** + * batadv_backbone_gw_put() - decrement the backbone gw refcounter and possibly + * release it + * @backbone_gw: backbone gateway to be free'd + */ +static void batadv_backbone_gw_put(struct batadv_bla_backbone_gw *backbone_gw) +{ + if (!backbone_gw) + return; + + kref_put(&backbone_gw->refcount, batadv_backbone_gw_release); +} + +/** + * batadv_claim_release() - release claim from lists and queue for free after + * rcu grace period + * @ref: kref pointer of the claim + */ +static void batadv_claim_release(struct kref *ref) +{ + struct batadv_bla_claim *claim; + struct batadv_bla_backbone_gw *old_backbone_gw; + + claim = container_of(ref, struct batadv_bla_claim, refcount); + + spin_lock_bh(&claim->backbone_lock); + old_backbone_gw = claim->backbone_gw; + claim->backbone_gw = NULL; + spin_unlock_bh(&claim->backbone_lock); + + spin_lock_bh(&old_backbone_gw->crc_lock); + old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); + spin_unlock_bh(&old_backbone_gw->crc_lock); + + batadv_backbone_gw_put(old_backbone_gw); + + kfree_rcu(claim, rcu); +} + +/** + * batadv_claim_put() - decrement the claim refcounter and possibly release it + * @claim: claim to be free'd + */ +static void batadv_claim_put(struct batadv_bla_claim *claim) +{ + if (!claim) + return; + + kref_put(&claim->refcount, batadv_claim_release); +} + +/** + * batadv_claim_hash_find() - looks for a claim in the claim hash + * @bat_priv: the bat priv with all the soft interface information + * @data: search data (may be local/static data) + * + * Return: claim if found or NULL otherwise. + */ +static struct batadv_bla_claim * +batadv_claim_hash_find(struct batadv_priv *bat_priv, + struct batadv_bla_claim *data) +{ + struct batadv_hashtable *hash = bat_priv->bla.claim_hash; + struct hlist_head *head; + struct batadv_bla_claim *claim; + struct batadv_bla_claim *claim_tmp = NULL; + int index; + + if (!hash) + return NULL; + + index = batadv_choose_claim(data, hash->size); + head = &hash->table[index]; + + rcu_read_lock(); + hlist_for_each_entry_rcu(claim, head, hash_entry) { + if (!batadv_compare_claim(&claim->hash_entry, data)) + continue; + + if (!kref_get_unless_zero(&claim->refcount)) + continue; + + claim_tmp = claim; + break; + } + rcu_read_unlock(); + + return claim_tmp; +} + +/** + * batadv_backbone_hash_find() - looks for a backbone gateway in the hash + * @bat_priv: the bat priv with all the soft interface information + * @addr: the address of the originator + * @vid: the VLAN ID + * + * Return: backbone gateway if found or NULL otherwise + */ +static struct batadv_bla_backbone_gw * +batadv_backbone_hash_find(struct batadv_priv *bat_priv, const u8 *addr, + unsigned short vid) +{ + struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; + struct hlist_head *head; + struct batadv_bla_backbone_gw search_entry, *backbone_gw; + struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL; + int index; + + if (!hash) + return NULL; + + ether_addr_copy(search_entry.orig, addr); + search_entry.vid = vid; + + index = batadv_choose_backbone_gw(&search_entry, hash->size); + head = &hash->table[index]; + + rcu_read_lock(); + hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { + if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry, + &search_entry)) + continue; + + if (!kref_get_unless_zero(&backbone_gw->refcount)) + continue; + + backbone_gw_tmp = backbone_gw; + break; + } + rcu_read_unlock(); + + return backbone_gw_tmp; +} + +/** + * batadv_bla_del_backbone_claims() - delete all claims for a backbone + * @backbone_gw: backbone gateway where the claims should be removed + */ +static void +batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw) +{ + struct batadv_hashtable *hash; + struct hlist_node *node_tmp; + struct hlist_head *head; + struct batadv_bla_claim *claim; + int i; + spinlock_t *list_lock; /* protects write access to the hash lists */ + + hash = backbone_gw->bat_priv->bla.claim_hash; + if (!hash) + return; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + list_lock = &hash->list_locks[i]; + + spin_lock_bh(list_lock); + hlist_for_each_entry_safe(claim, node_tmp, + head, hash_entry) { + if (claim->backbone_gw != backbone_gw) + continue; + + batadv_claim_put(claim); + hlist_del_rcu(&claim->hash_entry); + } + spin_unlock_bh(list_lock); + } + + /* all claims gone, initialize CRC */ + spin_lock_bh(&backbone_gw->crc_lock); + backbone_gw->crc = BATADV_BLA_CRC_INIT; + spin_unlock_bh(&backbone_gw->crc_lock); +} + +/** + * batadv_bla_send_claim() - sends a claim frame according to the provided info + * @bat_priv: the bat priv with all the soft interface information + * @mac: the mac address to be announced within the claim + * @vid: the VLAN ID + * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...) + */ +static void batadv_bla_send_claim(struct batadv_priv *bat_priv, const u8 *mac, + unsigned short vid, int claimtype) +{ + struct sk_buff *skb; + struct ethhdr *ethhdr; + struct batadv_hard_iface *primary_if; + struct net_device *soft_iface; + u8 *hw_src; + struct batadv_bla_claim_dst local_claim_dest; + __be32 zeroip = 0; + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + return; + + memcpy(&local_claim_dest, &bat_priv->bla.claim_dest, + sizeof(local_claim_dest)); + local_claim_dest.type = claimtype; + + soft_iface = primary_if->soft_iface; + + skb = arp_create(ARPOP_REPLY, ETH_P_ARP, + /* IP DST: 0.0.0.0 */ + zeroip, + primary_if->soft_iface, + /* IP SRC: 0.0.0.0 */ + zeroip, + /* Ethernet DST: Broadcast */ + NULL, + /* Ethernet SRC/HW SRC: originator mac */ + primary_if->net_dev->dev_addr, + /* HW DST: FF:43:05:XX:YY:YY + * with XX = claim type + * and YY:YY = group id + */ + (u8 *)&local_claim_dest); + + if (!skb) + goto out; + + ethhdr = (struct ethhdr *)skb->data; + hw_src = (u8 *)ethhdr + ETH_HLEN + sizeof(struct arphdr); + + /* now we pretend that the client would have sent this ... */ + switch (claimtype) { + case BATADV_CLAIM_TYPE_CLAIM: + /* normal claim frame + * set Ethernet SRC to the clients mac + */ + ether_addr_copy(ethhdr->h_source, mac); + batadv_dbg(BATADV_DBG_BLA, bat_priv, + "%s(): CLAIM %pM on vid %d\n", __func__, mac, + batadv_print_vid(vid)); + break; + case BATADV_CLAIM_TYPE_UNCLAIM: + /* unclaim frame + * set HW SRC to the clients mac + */ + ether_addr_copy(hw_src, mac); + batadv_dbg(BATADV_DBG_BLA, bat_priv, + "%s(): UNCLAIM %pM on vid %d\n", __func__, mac, + batadv_print_vid(vid)); + break; + case BATADV_CLAIM_TYPE_ANNOUNCE: + /* announcement frame + * set HW SRC to the special mac containing the crc + */ + ether_addr_copy(hw_src, mac); + batadv_dbg(BATADV_DBG_BLA, bat_priv, + "%s(): ANNOUNCE of %pM on vid %d\n", __func__, + ethhdr->h_source, batadv_print_vid(vid)); + break; + case BATADV_CLAIM_TYPE_REQUEST: + /* request frame + * set HW SRC and header destination to the receiving backbone + * gws mac + */ + ether_addr_copy(hw_src, mac); + ether_addr_copy(ethhdr->h_dest, mac); + batadv_dbg(BATADV_DBG_BLA, bat_priv, + "%s(): REQUEST of %pM to %pM on vid %d\n", __func__, + ethhdr->h_source, ethhdr->h_dest, + batadv_print_vid(vid)); + break; + case BATADV_CLAIM_TYPE_LOOPDETECT: + ether_addr_copy(ethhdr->h_source, mac); + batadv_dbg(BATADV_DBG_BLA, bat_priv, + "%s(): LOOPDETECT of %pM to %pM on vid %d\n", + __func__, ethhdr->h_source, ethhdr->h_dest, + batadv_print_vid(vid)); + + break; + } + + if (vid & BATADV_VLAN_HAS_TAG) { + skb = vlan_insert_tag(skb, htons(ETH_P_8021Q), + vid & VLAN_VID_MASK); + if (!skb) + goto out; + } + + skb_reset_mac_header(skb); + skb->protocol = eth_type_trans(skb, soft_iface); + batadv_inc_counter(bat_priv, BATADV_CNT_RX); + batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, + skb->len + ETH_HLEN); + + netif_rx(skb); +out: + batadv_hardif_put(primary_if); +} + +/** + * batadv_bla_loopdetect_report() - worker for reporting the loop + * @work: work queue item + * + * Throws an uevent, as the loopdetect check function can't do that itself + * since the kernel may sleep while throwing uevents. + */ +static void batadv_bla_loopdetect_report(struct work_struct *work) +{ + struct batadv_bla_backbone_gw *backbone_gw; + struct batadv_priv *bat_priv; + char vid_str[6] = { '\0' }; + + backbone_gw = container_of(work, struct batadv_bla_backbone_gw, + report_work); + bat_priv = backbone_gw->bat_priv; + + batadv_info(bat_priv->soft_iface, + "Possible loop on VLAN %d detected which can't be handled by BLA - please check your network setup!\n", + batadv_print_vid(backbone_gw->vid)); + snprintf(vid_str, sizeof(vid_str), "%d", + batadv_print_vid(backbone_gw->vid)); + vid_str[sizeof(vid_str) - 1] = 0; + + batadv_throw_uevent(bat_priv, BATADV_UEV_BLA, BATADV_UEV_LOOPDETECT, + vid_str); + + batadv_backbone_gw_put(backbone_gw); +} + +/** + * batadv_bla_get_backbone_gw() - finds or creates a backbone gateway + * @bat_priv: the bat priv with all the soft interface information + * @orig: the mac address of the originator + * @vid: the VLAN ID + * @own_backbone: set if the requested backbone is local + * + * Return: the (possibly created) backbone gateway or NULL on error + */ +static struct batadv_bla_backbone_gw * +batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, const u8 *orig, + unsigned short vid, bool own_backbone) +{ + struct batadv_bla_backbone_gw *entry; + struct batadv_orig_node *orig_node; + int hash_added; + + entry = batadv_backbone_hash_find(bat_priv, orig, vid); + + if (entry) + return entry; + + batadv_dbg(BATADV_DBG_BLA, bat_priv, + "%s(): not found (%pM, %d), creating new entry\n", __func__, + orig, batadv_print_vid(vid)); + + entry = kzalloc(sizeof(*entry), GFP_ATOMIC); + if (!entry) + return NULL; + + entry->vid = vid; + entry->lasttime = jiffies; + entry->crc = BATADV_BLA_CRC_INIT; + entry->bat_priv = bat_priv; + spin_lock_init(&entry->crc_lock); + atomic_set(&entry->request_sent, 0); + atomic_set(&entry->wait_periods, 0); + ether_addr_copy(entry->orig, orig); + INIT_WORK(&entry->report_work, batadv_bla_loopdetect_report); + kref_init(&entry->refcount); + + kref_get(&entry->refcount); + hash_added = batadv_hash_add(bat_priv->bla.backbone_hash, + batadv_compare_backbone_gw, + batadv_choose_backbone_gw, entry, + &entry->hash_entry); + + if (unlikely(hash_added != 0)) { + /* hash failed, free the structure */ + kfree(entry); + return NULL; + } + + /* this is a gateway now, remove any TT entry on this VLAN */ + orig_node = batadv_orig_hash_find(bat_priv, orig); + if (orig_node) { + batadv_tt_global_del_orig(bat_priv, orig_node, vid, + "became a backbone gateway"); + batadv_orig_node_put(orig_node); + } + + if (own_backbone) { + batadv_bla_send_announce(bat_priv, entry); + + /* this will be decreased in the worker thread */ + atomic_inc(&entry->request_sent); + atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS); + atomic_inc(&bat_priv->bla.num_requests); + } + + return entry; +} + +/** + * batadv_bla_update_own_backbone_gw() - updates the own backbone gw for a VLAN + * @bat_priv: the bat priv with all the soft interface information + * @primary_if: the selected primary interface + * @vid: VLAN identifier + * + * update or add the own backbone gw to make sure we announce + * where we receive other backbone gws + */ +static void +batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, + struct batadv_hard_iface *primary_if, + unsigned short vid) +{ + struct batadv_bla_backbone_gw *backbone_gw; + + backbone_gw = batadv_bla_get_backbone_gw(bat_priv, + primary_if->net_dev->dev_addr, + vid, true); + if (unlikely(!backbone_gw)) + return; + + backbone_gw->lasttime = jiffies; + batadv_backbone_gw_put(backbone_gw); +} + +/** + * batadv_bla_answer_request() - answer a bla request by sending own claims + * @bat_priv: the bat priv with all the soft interface information + * @primary_if: interface where the request came on + * @vid: the vid where the request came on + * + * Repeat all of our own claims, and finally send an ANNOUNCE frame + * to allow the requester another check if the CRC is correct now. + */ +static void batadv_bla_answer_request(struct batadv_priv *bat_priv, + struct batadv_hard_iface *primary_if, + unsigned short vid) +{ + struct hlist_head *head; + struct batadv_hashtable *hash; + struct batadv_bla_claim *claim; + struct batadv_bla_backbone_gw *backbone_gw; + int i; + + batadv_dbg(BATADV_DBG_BLA, bat_priv, + "%s(): received a claim request, send all of our own claims again\n", + __func__); + + backbone_gw = batadv_backbone_hash_find(bat_priv, + primary_if->net_dev->dev_addr, + vid); + if (!backbone_gw) + return; + + hash = bat_priv->bla.claim_hash; + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + rcu_read_lock(); + hlist_for_each_entry_rcu(claim, head, hash_entry) { + /* only own claims are interesting */ + if (claim->backbone_gw != backbone_gw) + continue; + + batadv_bla_send_claim(bat_priv, claim->addr, claim->vid, + BATADV_CLAIM_TYPE_CLAIM); + } + rcu_read_unlock(); + } + + /* finally, send an announcement frame */ + batadv_bla_send_announce(bat_priv, backbone_gw); + batadv_backbone_gw_put(backbone_gw); +} + +/** + * batadv_bla_send_request() - send a request to repeat claims + * @backbone_gw: the backbone gateway from whom we are out of sync + * + * When the crc is wrong, ask the backbone gateway for a full table update. + * After the request, it will repeat all of his own claims and finally + * send an announcement claim with which we can check again. + */ +static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw) +{ + /* first, remove all old entries */ + batadv_bla_del_backbone_claims(backbone_gw); + + batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, + "Sending REQUEST to %pM\n", backbone_gw->orig); + + /* send request */ + batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig, + backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST); + + /* no local broadcasts should be sent or received, for now. */ + if (!atomic_read(&backbone_gw->request_sent)) { + atomic_inc(&backbone_gw->bat_priv->bla.num_requests); + atomic_set(&backbone_gw->request_sent, 1); + } +} + +/** + * batadv_bla_send_announce() - Send an announcement frame + * @bat_priv: the bat priv with all the soft interface information + * @backbone_gw: our backbone gateway which should be announced + */ +static void batadv_bla_send_announce(struct batadv_priv *bat_priv, + struct batadv_bla_backbone_gw *backbone_gw) +{ + u8 mac[ETH_ALEN]; + __be16 crc; + + memcpy(mac, batadv_announce_mac, 4); + spin_lock_bh(&backbone_gw->crc_lock); + crc = htons(backbone_gw->crc); + spin_unlock_bh(&backbone_gw->crc_lock); + memcpy(&mac[4], &crc, 2); + + batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid, + BATADV_CLAIM_TYPE_ANNOUNCE); +} + +/** + * batadv_bla_add_claim() - Adds a claim in the claim hash + * @bat_priv: the bat priv with all the soft interface information + * @mac: the mac address of the claim + * @vid: the VLAN ID of the frame + * @backbone_gw: the backbone gateway which claims it + */ +static void batadv_bla_add_claim(struct batadv_priv *bat_priv, + const u8 *mac, const unsigned short vid, + struct batadv_bla_backbone_gw *backbone_gw) +{ + struct batadv_bla_backbone_gw *old_backbone_gw; + struct batadv_bla_claim *claim; + struct batadv_bla_claim search_claim; + bool remove_crc = false; + int hash_added; + + ether_addr_copy(search_claim.addr, mac); + search_claim.vid = vid; + claim = batadv_claim_hash_find(bat_priv, &search_claim); + + /* create a new claim entry if it does not exist yet. */ + if (!claim) { + claim = kzalloc(sizeof(*claim), GFP_ATOMIC); + if (!claim) + return; + + ether_addr_copy(claim->addr, mac); + spin_lock_init(&claim->backbone_lock); + claim->vid = vid; + claim->lasttime = jiffies; + kref_get(&backbone_gw->refcount); + claim->backbone_gw = backbone_gw; + kref_init(&claim->refcount); + + batadv_dbg(BATADV_DBG_BLA, bat_priv, + "%s(): adding new entry %pM, vid %d to hash ...\n", + __func__, mac, batadv_print_vid(vid)); + + kref_get(&claim->refcount); + hash_added = batadv_hash_add(bat_priv->bla.claim_hash, + batadv_compare_claim, + batadv_choose_claim, claim, + &claim->hash_entry); + + if (unlikely(hash_added != 0)) { + /* only local changes happened. */ + kfree(claim); + return; + } + } else { + claim->lasttime = jiffies; + if (claim->backbone_gw == backbone_gw) + /* no need to register a new backbone */ + goto claim_free_ref; + + batadv_dbg(BATADV_DBG_BLA, bat_priv, + "%s(): changing ownership for %pM, vid %d to gw %pM\n", + __func__, mac, batadv_print_vid(vid), + backbone_gw->orig); + + remove_crc = true; + } + + /* replace backbone_gw atomically and adjust reference counters */ + spin_lock_bh(&claim->backbone_lock); + old_backbone_gw = claim->backbone_gw; + kref_get(&backbone_gw->refcount); + claim->backbone_gw = backbone_gw; + spin_unlock_bh(&claim->backbone_lock); + + if (remove_crc) { + /* remove claim address from old backbone_gw */ + spin_lock_bh(&old_backbone_gw->crc_lock); + old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); + spin_unlock_bh(&old_backbone_gw->crc_lock); + } + + batadv_backbone_gw_put(old_backbone_gw); + + /* add claim address to new backbone_gw */ + spin_lock_bh(&backbone_gw->crc_lock); + backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); + spin_unlock_bh(&backbone_gw->crc_lock); + backbone_gw->lasttime = jiffies; + +claim_free_ref: + batadv_claim_put(claim); +} + +/** + * batadv_bla_claim_get_backbone_gw() - Get valid reference for backbone_gw of + * claim + * @claim: claim whose backbone_gw should be returned + * + * Return: valid reference to claim::backbone_gw + */ +static struct batadv_bla_backbone_gw * +batadv_bla_claim_get_backbone_gw(struct batadv_bla_claim *claim) +{ + struct batadv_bla_backbone_gw *backbone_gw; + + spin_lock_bh(&claim->backbone_lock); + backbone_gw = claim->backbone_gw; + kref_get(&backbone_gw->refcount); + spin_unlock_bh(&claim->backbone_lock); + + return backbone_gw; +} + +/** + * batadv_bla_del_claim() - delete a claim from the claim hash + * @bat_priv: the bat priv with all the soft interface information + * @mac: mac address of the claim to be removed + * @vid: VLAN id for the claim to be removed + */ +static void batadv_bla_del_claim(struct batadv_priv *bat_priv, + const u8 *mac, const unsigned short vid) +{ + struct batadv_bla_claim search_claim, *claim; + struct batadv_bla_claim *claim_removed_entry; + struct hlist_node *claim_removed_node; + + ether_addr_copy(search_claim.addr, mac); + search_claim.vid = vid; + claim = batadv_claim_hash_find(bat_priv, &search_claim); + if (!claim) + return; + + batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): %pM, vid %d\n", __func__, + mac, batadv_print_vid(vid)); + + claim_removed_node = batadv_hash_remove(bat_priv->bla.claim_hash, + batadv_compare_claim, + batadv_choose_claim, claim); + if (!claim_removed_node) + goto free_claim; + + /* reference from the hash is gone */ + claim_removed_entry = hlist_entry(claim_removed_node, + struct batadv_bla_claim, hash_entry); + batadv_claim_put(claim_removed_entry); + +free_claim: + /* don't need the reference from hash_find() anymore */ + batadv_claim_put(claim); +} + +/** + * batadv_handle_announce() - check for ANNOUNCE frame + * @bat_priv: the bat priv with all the soft interface information + * @an_addr: announcement mac address (ARP Sender HW address) + * @backbone_addr: originator address of the sender (Ethernet source MAC) + * @vid: the VLAN ID of the frame + * + * Return: true if handled + */ +static bool batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr, + u8 *backbone_addr, unsigned short vid) +{ + struct batadv_bla_backbone_gw *backbone_gw; + u16 backbone_crc, crc; + + if (memcmp(an_addr, batadv_announce_mac, 4) != 0) + return false; + + backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, + false); + + if (unlikely(!backbone_gw)) + return true; + + /* handle as ANNOUNCE frame */ + backbone_gw->lasttime = jiffies; + crc = ntohs(*((__force __be16 *)(&an_addr[4]))); + + batadv_dbg(BATADV_DBG_BLA, bat_priv, + "%s(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n", + __func__, batadv_print_vid(vid), backbone_gw->orig, crc); + + spin_lock_bh(&backbone_gw->crc_lock); + backbone_crc = backbone_gw->crc; + spin_unlock_bh(&backbone_gw->crc_lock); + + if (backbone_crc != crc) { + batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, + "%s(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n", + __func__, backbone_gw->orig, + batadv_print_vid(backbone_gw->vid), + backbone_crc, crc); + + batadv_bla_send_request(backbone_gw); + } else { + /* if we have sent a request and the crc was OK, + * we can allow traffic again. + */ + if (atomic_read(&backbone_gw->request_sent)) { + atomic_dec(&backbone_gw->bat_priv->bla.num_requests); + atomic_set(&backbone_gw->request_sent, 0); + } + } + + batadv_backbone_gw_put(backbone_gw); + return true; +} + +/** + * batadv_handle_request() - check for REQUEST frame + * @bat_priv: the bat priv with all the soft interface information + * @primary_if: the primary hard interface of this batman soft interface + * @backbone_addr: backbone address to be requested (ARP sender HW MAC) + * @ethhdr: ethernet header of a packet + * @vid: the VLAN ID of the frame + * + * Return: true if handled + */ +static bool batadv_handle_request(struct batadv_priv *bat_priv, + struct batadv_hard_iface *primary_if, + u8 *backbone_addr, struct ethhdr *ethhdr, + unsigned short vid) +{ + /* check for REQUEST frame */ + if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest)) + return false; + + /* sanity check, this should not happen on a normal switch, + * we ignore it in this case. + */ + if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr)) + return true; + + batadv_dbg(BATADV_DBG_BLA, bat_priv, + "%s(): REQUEST vid %d (sent by %pM)...\n", + __func__, batadv_print_vid(vid), ethhdr->h_source); + + batadv_bla_answer_request(bat_priv, primary_if, vid); + return true; +} + +/** + * batadv_handle_unclaim() - check for UNCLAIM frame + * @bat_priv: the bat priv with all the soft interface information + * @primary_if: the primary hard interface of this batman soft interface + * @backbone_addr: originator address of the backbone (Ethernet source) + * @claim_addr: Client to be unclaimed (ARP sender HW MAC) + * @vid: the VLAN ID of the frame + * + * Return: true if handled + */ +static bool batadv_handle_unclaim(struct batadv_priv *bat_priv, + struct batadv_hard_iface *primary_if, + const u8 *backbone_addr, const u8 *claim_addr, + unsigned short vid) +{ + struct batadv_bla_backbone_gw *backbone_gw; + + /* unclaim in any case if it is our own */ + if (primary_if && batadv_compare_eth(backbone_addr, + primary_if->net_dev->dev_addr)) + batadv_bla_send_claim(bat_priv, claim_addr, vid, + BATADV_CLAIM_TYPE_UNCLAIM); + + backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid); + + if (!backbone_gw) + return true; + + /* this must be an UNCLAIM frame */ + batadv_dbg(BATADV_DBG_BLA, bat_priv, + "%s(): UNCLAIM %pM on vid %d (sent by %pM)...\n", __func__, + claim_addr, batadv_print_vid(vid), backbone_gw->orig); + + batadv_bla_del_claim(bat_priv, claim_addr, vid); + batadv_backbone_gw_put(backbone_gw); + return true; +} + +/** + * batadv_handle_claim() - check for CLAIM frame + * @bat_priv: the bat priv with all the soft interface information + * @primary_if: the primary hard interface of this batman soft interface + * @backbone_addr: originator address of the backbone (Ethernet Source) + * @claim_addr: client mac address to be claimed (ARP sender HW MAC) + * @vid: the VLAN ID of the frame + * + * Return: true if handled + */ +static bool batadv_handle_claim(struct batadv_priv *bat_priv, + struct batadv_hard_iface *primary_if, + const u8 *backbone_addr, const u8 *claim_addr, + unsigned short vid) +{ + struct batadv_bla_backbone_gw *backbone_gw; + + /* register the gateway if not yet available, and add the claim. */ + + backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, + false); + + if (unlikely(!backbone_gw)) + return true; + + /* this must be a CLAIM frame */ + batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw); + if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) + batadv_bla_send_claim(bat_priv, claim_addr, vid, + BATADV_CLAIM_TYPE_CLAIM); + + /* TODO: we could call something like tt_local_del() here. */ + + batadv_backbone_gw_put(backbone_gw); + return true; +} + +/** + * batadv_check_claim_group() - check for claim group membership + * @bat_priv: the bat priv with all the soft interface information + * @primary_if: the primary interface of this batman interface + * @hw_src: the Hardware source in the ARP Header + * @hw_dst: the Hardware destination in the ARP Header + * @ethhdr: pointer to the Ethernet header of the claim frame + * + * checks if it is a claim packet and if it's on the same group. + * This function also applies the group ID of the sender + * if it is in the same mesh. + * + * Return: + * 2 - if it is a claim packet and on the same group + * 1 - if is a claim packet from another group + * 0 - if it is not a claim packet + */ +static int batadv_check_claim_group(struct batadv_priv *bat_priv, + struct batadv_hard_iface *primary_if, + u8 *hw_src, u8 *hw_dst, + struct ethhdr *ethhdr) +{ + u8 *backbone_addr; + struct batadv_orig_node *orig_node; + struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; + + bla_dst = (struct batadv_bla_claim_dst *)hw_dst; + bla_dst_own = &bat_priv->bla.claim_dest; + + /* if announcement packet, use the source, + * otherwise assume it is in the hw_src + */ + switch (bla_dst->type) { + case BATADV_CLAIM_TYPE_CLAIM: + backbone_addr = hw_src; + break; + case BATADV_CLAIM_TYPE_REQUEST: + case BATADV_CLAIM_TYPE_ANNOUNCE: + case BATADV_CLAIM_TYPE_UNCLAIM: + backbone_addr = ethhdr->h_source; + break; + default: + return 0; + } + + /* don't accept claim frames from ourselves */ + if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) + return 0; + + /* if its already the same group, it is fine. */ + if (bla_dst->group == bla_dst_own->group) + return 2; + + /* lets see if this originator is in our mesh */ + orig_node = batadv_orig_hash_find(bat_priv, backbone_addr); + + /* don't accept claims from gateways which are not in + * the same mesh or group. + */ + if (!orig_node) + return 1; + + /* if our mesh friends mac is bigger, use it for ourselves. */ + if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) { + batadv_dbg(BATADV_DBG_BLA, bat_priv, + "taking other backbones claim group: %#.4x\n", + ntohs(bla_dst->group)); + bla_dst_own->group = bla_dst->group; + } + + batadv_orig_node_put(orig_node); + + return 2; +} + +/** + * batadv_bla_process_claim() - Check if this is a claim frame, and process it + * @bat_priv: the bat priv with all the soft interface information + * @primary_if: the primary hard interface of this batman soft interface + * @skb: the frame to be checked + * + * Return: true if it was a claim frame, otherwise return false to + * tell the callee that it can use the frame on its own. + */ +static bool batadv_bla_process_claim(struct batadv_priv *bat_priv, + struct batadv_hard_iface *primary_if, + struct sk_buff *skb) +{ + struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; + u8 *hw_src, *hw_dst; + struct vlan_hdr *vhdr, vhdr_buf; + struct ethhdr *ethhdr; + struct arphdr *arphdr; + unsigned short vid; + int vlan_depth = 0; + __be16 proto; + int headlen; + int ret; + + vid = batadv_get_vid(skb, 0); + ethhdr = eth_hdr(skb); + + proto = ethhdr->h_proto; + headlen = ETH_HLEN; + if (vid & BATADV_VLAN_HAS_TAG) { + /* Traverse the VLAN/Ethertypes. + * + * At this point it is known that the first protocol is a VLAN + * header, so start checking at the encapsulated protocol. + * + * The depth of the VLAN headers is recorded to drop BLA claim + * frames encapsulated into multiple VLAN headers (QinQ). + */ + do { + vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN, + &vhdr_buf); + if (!vhdr) + return false; + + proto = vhdr->h_vlan_encapsulated_proto; + headlen += VLAN_HLEN; + vlan_depth++; + } while (proto == htons(ETH_P_8021Q)); + } + + if (proto != htons(ETH_P_ARP)) + return false; /* not a claim frame */ + + /* this must be a ARP frame. check if it is a claim. */ + + if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev)))) + return false; + + /* pskb_may_pull() may have modified the pointers, get ethhdr again */ + ethhdr = eth_hdr(skb); + arphdr = (struct arphdr *)((u8 *)ethhdr + headlen); + + /* Check whether the ARP frame carries a valid + * IP information + */ + if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) + return false; + if (arphdr->ar_pro != htons(ETH_P_IP)) + return false; + if (arphdr->ar_hln != ETH_ALEN) + return false; + if (arphdr->ar_pln != 4) + return false; + + hw_src = (u8 *)arphdr + sizeof(struct arphdr); + hw_dst = hw_src + ETH_ALEN + 4; + bla_dst = (struct batadv_bla_claim_dst *)hw_dst; + bla_dst_own = &bat_priv->bla.claim_dest; + + /* check if it is a claim frame in general */ + if (memcmp(bla_dst->magic, bla_dst_own->magic, + sizeof(bla_dst->magic)) != 0) + return false; + + /* check if there is a claim frame encapsulated deeper in (QinQ) and + * drop that, as this is not supported by BLA but should also not be + * sent via the mesh. + */ + if (vlan_depth > 1) + return true; + + /* Let the loopdetect frames on the mesh in any case. */ + if (bla_dst->type == BATADV_CLAIM_TYPE_LOOPDETECT) + return false; + + /* check if it is a claim frame. */ + ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst, + ethhdr); + if (ret == 1) + batadv_dbg(BATADV_DBG_BLA, bat_priv, + "%s(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", + __func__, ethhdr->h_source, batadv_print_vid(vid), + hw_src, hw_dst); + + if (ret < 2) + return !!ret; + + /* become a backbone gw ourselves on this vlan if not happened yet */ + batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); + + /* check for the different types of claim frames ... */ + switch (bla_dst->type) { + case BATADV_CLAIM_TYPE_CLAIM: + if (batadv_handle_claim(bat_priv, primary_if, hw_src, + ethhdr->h_source, vid)) + return true; + break; + case BATADV_CLAIM_TYPE_UNCLAIM: + if (batadv_handle_unclaim(bat_priv, primary_if, + ethhdr->h_source, hw_src, vid)) + return true; + break; + + case BATADV_CLAIM_TYPE_ANNOUNCE: + if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source, + vid)) + return true; + break; + case BATADV_CLAIM_TYPE_REQUEST: + if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr, + vid)) + return true; + break; + } + + batadv_dbg(BATADV_DBG_BLA, bat_priv, + "%s(): ERROR - this looks like a claim frame, but is useless. eth src %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", + __func__, ethhdr->h_source, batadv_print_vid(vid), hw_src, + hw_dst); + return true; +} + +/** + * batadv_bla_purge_backbone_gw() - Remove backbone gateways after a timeout or + * immediately + * @bat_priv: the bat priv with all the soft interface information + * @now: whether the whole hash shall be wiped now + * + * Check when we last heard from other nodes, and remove them in case of + * a time out, or clean all backbone gws if now is set. + */ +static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now) +{ + struct batadv_bla_backbone_gw *backbone_gw; + struct hlist_node *node_tmp; + struct hlist_head *head; + struct batadv_hashtable *hash; + spinlock_t *list_lock; /* protects write access to the hash lists */ + int i; + + hash = bat_priv->bla.backbone_hash; + if (!hash) + return; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + list_lock = &hash->list_locks[i]; + + spin_lock_bh(list_lock); + hlist_for_each_entry_safe(backbone_gw, node_tmp, + head, hash_entry) { + if (now) + goto purge_now; + if (!batadv_has_timed_out(backbone_gw->lasttime, + BATADV_BLA_BACKBONE_TIMEOUT)) + continue; + + batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, + "%s(): backbone gw %pM timed out\n", + __func__, backbone_gw->orig); + +purge_now: + /* don't wait for the pending request anymore */ + if (atomic_read(&backbone_gw->request_sent)) + atomic_dec(&bat_priv->bla.num_requests); + + batadv_bla_del_backbone_claims(backbone_gw); + + hlist_del_rcu(&backbone_gw->hash_entry); + batadv_backbone_gw_put(backbone_gw); + } + spin_unlock_bh(list_lock); + } +} + +/** + * batadv_bla_purge_claims() - Remove claims after a timeout or immediately + * @bat_priv: the bat priv with all the soft interface information + * @primary_if: the selected primary interface, may be NULL if now is set + * @now: whether the whole hash shall be wiped now + * + * Check when we heard last time from our own claims, and remove them in case of + * a time out, or clean all claims if now is set + */ +static void batadv_bla_purge_claims(struct batadv_priv *bat_priv, + struct batadv_hard_iface *primary_if, + int now) +{ + struct batadv_bla_backbone_gw *backbone_gw; + struct batadv_bla_claim *claim; + struct hlist_head *head; + struct batadv_hashtable *hash; + int i; + + hash = bat_priv->bla.claim_hash; + if (!hash) + return; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + rcu_read_lock(); + hlist_for_each_entry_rcu(claim, head, hash_entry) { + backbone_gw = batadv_bla_claim_get_backbone_gw(claim); + if (now) + goto purge_now; + + if (!batadv_compare_eth(backbone_gw->orig, + primary_if->net_dev->dev_addr)) + goto skip; + + if (!batadv_has_timed_out(claim->lasttime, + BATADV_BLA_CLAIM_TIMEOUT)) + goto skip; + + batadv_dbg(BATADV_DBG_BLA, bat_priv, + "%s(): timed out.\n", __func__); + +purge_now: + batadv_dbg(BATADV_DBG_BLA, bat_priv, + "%s(): %pM, vid %d\n", __func__, + claim->addr, claim->vid); + + batadv_handle_unclaim(bat_priv, primary_if, + backbone_gw->orig, + claim->addr, claim->vid); +skip: + batadv_backbone_gw_put(backbone_gw); + } + rcu_read_unlock(); + } +} + +/** + * batadv_bla_update_orig_address() - Update the backbone gateways when the own + * originator address changes + * @bat_priv: the bat priv with all the soft interface information + * @primary_if: the new selected primary_if + * @oldif: the old primary interface, may be NULL + */ +void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, + struct batadv_hard_iface *primary_if, + struct batadv_hard_iface *oldif) +{ + struct batadv_bla_backbone_gw *backbone_gw; + struct hlist_head *head; + struct batadv_hashtable *hash; + __be16 group; + int i; + + /* reset bridge loop avoidance group id */ + group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN)); + bat_priv->bla.claim_dest.group = group; + + /* purge everything when bridge loop avoidance is turned off */ + if (!atomic_read(&bat_priv->bridge_loop_avoidance)) + oldif = NULL; + + if (!oldif) { + batadv_bla_purge_claims(bat_priv, NULL, 1); + batadv_bla_purge_backbone_gw(bat_priv, 1); + return; + } + + hash = bat_priv->bla.backbone_hash; + if (!hash) + return; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + rcu_read_lock(); + hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { + /* own orig still holds the old value. */ + if (!batadv_compare_eth(backbone_gw->orig, + oldif->net_dev->dev_addr)) + continue; + + ether_addr_copy(backbone_gw->orig, + primary_if->net_dev->dev_addr); + /* send an announce frame so others will ask for our + * claims and update their tables. + */ + batadv_bla_send_announce(bat_priv, backbone_gw); + } + rcu_read_unlock(); + } +} + +/** + * batadv_bla_send_loopdetect() - send a loopdetect frame + * @bat_priv: the bat priv with all the soft interface information + * @backbone_gw: the backbone gateway for which a loop should be detected + * + * To detect loops that the bridge loop avoidance can't handle, send a loop + * detection packet on the backbone. Unlike other BLA frames, this frame will + * be allowed on the mesh by other nodes. If it is received on the mesh, this + * indicates that there is a loop. + */ +static void +batadv_bla_send_loopdetect(struct batadv_priv *bat_priv, + struct batadv_bla_backbone_gw *backbone_gw) +{ + batadv_dbg(BATADV_DBG_BLA, bat_priv, "Send loopdetect frame for vid %d\n", + backbone_gw->vid); + batadv_bla_send_claim(bat_priv, bat_priv->bla.loopdetect_addr, + backbone_gw->vid, BATADV_CLAIM_TYPE_LOOPDETECT); +} + +/** + * batadv_bla_status_update() - purge bla interfaces if necessary + * @net_dev: the soft interface net device + */ +void batadv_bla_status_update(struct net_device *net_dev) +{ + struct batadv_priv *bat_priv = netdev_priv(net_dev); + struct batadv_hard_iface *primary_if; + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + return; + + /* this function already purges everything when bla is disabled, + * so just call that one. + */ + batadv_bla_update_orig_address(bat_priv, primary_if, primary_if); + batadv_hardif_put(primary_if); +} + +/** + * batadv_bla_periodic_work() - performs periodic bla work + * @work: kernel work struct + * + * periodic work to do: + * * purge structures when they are too old + * * send announcements + */ +static void batadv_bla_periodic_work(struct work_struct *work) +{ + struct delayed_work *delayed_work; + struct batadv_priv *bat_priv; + struct batadv_priv_bla *priv_bla; + struct hlist_head *head; + struct batadv_bla_backbone_gw *backbone_gw; + struct batadv_hashtable *hash; + struct batadv_hard_iface *primary_if; + bool send_loopdetect = false; + int i; + + delayed_work = to_delayed_work(work); + priv_bla = container_of(delayed_work, struct batadv_priv_bla, work); + bat_priv = container_of(priv_bla, struct batadv_priv, bla); + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + goto out; + + batadv_bla_purge_claims(bat_priv, primary_if, 0); + batadv_bla_purge_backbone_gw(bat_priv, 0); + + if (!atomic_read(&bat_priv->bridge_loop_avoidance)) + goto out; + + if (atomic_dec_and_test(&bat_priv->bla.loopdetect_next)) { + /* set a new random mac address for the next bridge loop + * detection frames. Set the locally administered bit to avoid + * collisions with users mac addresses. + */ + eth_random_addr(bat_priv->bla.loopdetect_addr); + bat_priv->bla.loopdetect_addr[0] = 0xba; + bat_priv->bla.loopdetect_addr[1] = 0xbe; + bat_priv->bla.loopdetect_lasttime = jiffies; + atomic_set(&bat_priv->bla.loopdetect_next, + BATADV_BLA_LOOPDETECT_PERIODS); + + /* mark for sending loop detect on all VLANs */ + send_loopdetect = true; + } + + hash = bat_priv->bla.backbone_hash; + if (!hash) + goto out; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + rcu_read_lock(); + hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { + if (!batadv_compare_eth(backbone_gw->orig, + primary_if->net_dev->dev_addr)) + continue; + + backbone_gw->lasttime = jiffies; + + batadv_bla_send_announce(bat_priv, backbone_gw); + if (send_loopdetect) + batadv_bla_send_loopdetect(bat_priv, + backbone_gw); + + /* request_sent is only set after creation to avoid + * problems when we are not yet known as backbone gw + * in the backbone. + * + * We can reset this now after we waited some periods + * to give bridge forward delays and bla group forming + * some grace time. + */ + + if (atomic_read(&backbone_gw->request_sent) == 0) + continue; + + if (!atomic_dec_and_test(&backbone_gw->wait_periods)) + continue; + + atomic_dec(&backbone_gw->bat_priv->bla.num_requests); + atomic_set(&backbone_gw->request_sent, 0); + } + rcu_read_unlock(); + } +out: + batadv_hardif_put(primary_if); + + queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, + msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); +} + +/* The hash for claim and backbone hash receive the same key because they + * are getting initialized by hash_new with the same key. Reinitializing + * them with to different keys to allow nested locking without generating + * lockdep warnings + */ +static struct lock_class_key batadv_claim_hash_lock_class_key; +static struct lock_class_key batadv_backbone_hash_lock_class_key; + +/** + * batadv_bla_init() - initialize all bla structures + * @bat_priv: the bat priv with all the soft interface information + * + * Return: 0 on success, < 0 on error. + */ +int batadv_bla_init(struct batadv_priv *bat_priv) +{ + int i; + u8 claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00}; + struct batadv_hard_iface *primary_if; + u16 crc; + unsigned long entrytime; + + spin_lock_init(&bat_priv->bla.bcast_duplist_lock); + + batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n"); + + /* setting claim destination address */ + memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3); + bat_priv->bla.claim_dest.type = 0; + primary_if = batadv_primary_if_get_selected(bat_priv); + if (primary_if) { + crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN); + bat_priv->bla.claim_dest.group = htons(crc); + batadv_hardif_put(primary_if); + } else { + bat_priv->bla.claim_dest.group = 0; /* will be set later */ + } + + /* initialize the duplicate list */ + entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT); + for (i = 0; i < BATADV_DUPLIST_SIZE; i++) + bat_priv->bla.bcast_duplist[i].entrytime = entrytime; + bat_priv->bla.bcast_duplist_curr = 0; + + atomic_set(&bat_priv->bla.loopdetect_next, + BATADV_BLA_LOOPDETECT_PERIODS); + + if (bat_priv->bla.claim_hash) + return 0; + + bat_priv->bla.claim_hash = batadv_hash_new(128); + if (!bat_priv->bla.claim_hash) + return -ENOMEM; + + bat_priv->bla.backbone_hash = batadv_hash_new(32); + if (!bat_priv->bla.backbone_hash) { + batadv_hash_destroy(bat_priv->bla.claim_hash); + return -ENOMEM; + } + + batadv_hash_set_lock_class(bat_priv->bla.claim_hash, + &batadv_claim_hash_lock_class_key); + batadv_hash_set_lock_class(bat_priv->bla.backbone_hash, + &batadv_backbone_hash_lock_class_key); + + batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n"); + + INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work); + + queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, + msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); + return 0; +} + +/** + * batadv_bla_check_duplist() - Check if a frame is in the broadcast dup. + * @bat_priv: the bat priv with all the soft interface information + * @skb: contains the multicast packet to be checked + * @payload_ptr: pointer to position inside the head buffer of the skb + * marking the start of the data to be CRC'ed + * @orig: originator mac address, NULL if unknown + * + * Check if it is on our broadcast list. Another gateway might have sent the + * same packet because it is connected to the same backbone, so we have to + * remove this duplicate. + * + * This is performed by checking the CRC, which will tell us + * with a good chance that it is the same packet. If it is furthermore + * sent by another host, drop it. We allow equal packets from + * the same host however as this might be intended. + * + * Return: true if a packet is in the duplicate list, false otherwise. + */ +static bool batadv_bla_check_duplist(struct batadv_priv *bat_priv, + struct sk_buff *skb, u8 *payload_ptr, + const u8 *orig) +{ + struct batadv_bcast_duplist_entry *entry; + bool ret = false; + int i, curr; + __be32 crc; + + /* calculate the crc ... */ + crc = batadv_skb_crc32(skb, payload_ptr); + + spin_lock_bh(&bat_priv->bla.bcast_duplist_lock); + + for (i = 0; i < BATADV_DUPLIST_SIZE; i++) { + curr = (bat_priv->bla.bcast_duplist_curr + i); + curr %= BATADV_DUPLIST_SIZE; + entry = &bat_priv->bla.bcast_duplist[curr]; + + /* we can stop searching if the entry is too old ; + * later entries will be even older + */ + if (batadv_has_timed_out(entry->entrytime, + BATADV_DUPLIST_TIMEOUT)) + break; + + if (entry->crc != crc) + continue; + + /* are the originators both known and not anonymous? */ + if (orig && !is_zero_ether_addr(orig) && + !is_zero_ether_addr(entry->orig)) { + /* If known, check if the new frame came from + * the same originator: + * We are safe to take identical frames from the + * same orig, if known, as multiplications in + * the mesh are detected via the (orig, seqno) pair. + * So we can be a bit more liberal here and allow + * identical frames from the same orig which the source + * host might have sent multiple times on purpose. + */ + if (batadv_compare_eth(entry->orig, orig)) + continue; + } + + /* this entry seems to match: same crc, not too old, + * and from another gw. therefore return true to forbid it. + */ + ret = true; + goto out; + } + /* not found, add a new entry (overwrite the oldest entry) + * and allow it, its the first occurrence. + */ + curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1); + curr %= BATADV_DUPLIST_SIZE; + entry = &bat_priv->bla.bcast_duplist[curr]; + entry->crc = crc; + entry->entrytime = jiffies; + + /* known originator */ + if (orig) + ether_addr_copy(entry->orig, orig); + /* anonymous originator */ + else + eth_zero_addr(entry->orig); + + bat_priv->bla.bcast_duplist_curr = curr; + +out: + spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock); + + return ret; +} + +/** + * batadv_bla_check_ucast_duplist() - Check if a frame is in the broadcast dup. + * @bat_priv: the bat priv with all the soft interface information + * @skb: contains the multicast packet to be checked, decapsulated from a + * unicast_packet + * + * Check if it is on our broadcast list. Another gateway might have sent the + * same packet because it is connected to the same backbone, so we have to + * remove this duplicate. + * + * Return: true if a packet is in the duplicate list, false otherwise. + */ +static bool batadv_bla_check_ucast_duplist(struct batadv_priv *bat_priv, + struct sk_buff *skb) +{ + return batadv_bla_check_duplist(bat_priv, skb, (u8 *)skb->data, NULL); +} + +/** + * batadv_bla_check_bcast_duplist() - Check if a frame is in the broadcast dup. + * @bat_priv: the bat priv with all the soft interface information + * @skb: contains the bcast_packet to be checked + * + * Check if it is on our broadcast list. Another gateway might have sent the + * same packet because it is connected to the same backbone, so we have to + * remove this duplicate. + * + * Return: true if a packet is in the duplicate list, false otherwise. + */ +bool batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, + struct sk_buff *skb) +{ + struct batadv_bcast_packet *bcast_packet; + u8 *payload_ptr; + + bcast_packet = (struct batadv_bcast_packet *)skb->data; + payload_ptr = (u8 *)(bcast_packet + 1); + + return batadv_bla_check_duplist(bat_priv, skb, payload_ptr, + bcast_packet->orig); +} + +/** + * batadv_bla_is_backbone_gw_orig() - Check if the originator is a gateway for + * the VLAN identified by vid. + * @bat_priv: the bat priv with all the soft interface information + * @orig: originator mac address + * @vid: VLAN identifier + * + * Return: true if orig is a backbone for this vid, false otherwise. + */ +bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig, + unsigned short vid) +{ + struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; + struct hlist_head *head; + struct batadv_bla_backbone_gw *backbone_gw; + int i; + + if (!atomic_read(&bat_priv->bridge_loop_avoidance)) + return false; + + if (!hash) + return false; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + rcu_read_lock(); + hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { + if (batadv_compare_eth(backbone_gw->orig, orig) && + backbone_gw->vid == vid) { + rcu_read_unlock(); + return true; + } + } + rcu_read_unlock(); + } + + return false; +} + +/** + * batadv_bla_is_backbone_gw() - check if originator is a backbone gw for a VLAN + * @skb: the frame to be checked + * @orig_node: the orig_node of the frame + * @hdr_size: maximum length of the frame + * + * Return: true if the orig_node is also a gateway on the soft interface, + * otherwise it returns false. + */ +bool batadv_bla_is_backbone_gw(struct sk_buff *skb, + struct batadv_orig_node *orig_node, int hdr_size) +{ + struct batadv_bla_backbone_gw *backbone_gw; + unsigned short vid; + + if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance)) + return false; + + /* first, find out the vid. */ + if (!pskb_may_pull(skb, hdr_size + ETH_HLEN)) + return false; + + vid = batadv_get_vid(skb, hdr_size); + + /* see if this originator is a backbone gw for this VLAN */ + backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv, + orig_node->orig, vid); + if (!backbone_gw) + return false; + + batadv_backbone_gw_put(backbone_gw); + return true; +} + +/** + * batadv_bla_free() - free all bla structures + * @bat_priv: the bat priv with all the soft interface information + * + * for softinterface free or module unload + */ +void batadv_bla_free(struct batadv_priv *bat_priv) +{ + struct batadv_hard_iface *primary_if; + + cancel_delayed_work_sync(&bat_priv->bla.work); + primary_if = batadv_primary_if_get_selected(bat_priv); + + if (bat_priv->bla.claim_hash) { + batadv_bla_purge_claims(bat_priv, primary_if, 1); + batadv_hash_destroy(bat_priv->bla.claim_hash); + bat_priv->bla.claim_hash = NULL; + } + if (bat_priv->bla.backbone_hash) { + batadv_bla_purge_backbone_gw(bat_priv, 1); + batadv_hash_destroy(bat_priv->bla.backbone_hash); + bat_priv->bla.backbone_hash = NULL; + } + batadv_hardif_put(primary_if); +} + +/** + * batadv_bla_loopdetect_check() - check and handle a detected loop + * @bat_priv: the bat priv with all the soft interface information + * @skb: the packet to check + * @primary_if: interface where the request came on + * @vid: the VLAN ID of the frame + * + * Checks if this packet is a loop detect frame which has been sent by us, + * throws an uevent and logs the event if that is the case. + * + * Return: true if it is a loop detect frame which is to be dropped, false + * otherwise. + */ +static bool +batadv_bla_loopdetect_check(struct batadv_priv *bat_priv, struct sk_buff *skb, + struct batadv_hard_iface *primary_if, + unsigned short vid) +{ + struct batadv_bla_backbone_gw *backbone_gw; + struct ethhdr *ethhdr; + bool ret; + + ethhdr = eth_hdr(skb); + + /* Only check for the MAC address and skip more checks here for + * performance reasons - this function is on the hotpath, after all. + */ + if (!batadv_compare_eth(ethhdr->h_source, + bat_priv->bla.loopdetect_addr)) + return false; + + /* If the packet came too late, don't forward it on the mesh + * but don't consider that as loop. It might be a coincidence. + */ + if (batadv_has_timed_out(bat_priv->bla.loopdetect_lasttime, + BATADV_BLA_LOOPDETECT_TIMEOUT)) + return true; + + backbone_gw = batadv_bla_get_backbone_gw(bat_priv, + primary_if->net_dev->dev_addr, + vid, true); + if (unlikely(!backbone_gw)) + return true; + + ret = queue_work(batadv_event_workqueue, &backbone_gw->report_work); + + /* backbone_gw is unreferenced in the report work function + * if queue_work() call was successful + */ + if (!ret) + batadv_backbone_gw_put(backbone_gw); + + return true; +} + +/** + * batadv_bla_rx() - check packets coming from the mesh. + * @bat_priv: the bat priv with all the soft interface information + * @skb: the frame to be checked + * @vid: the VLAN ID of the frame + * @packet_type: the batman packet type this frame came in + * + * batadv_bla_rx avoidance checks if: + * * we have to race for a claim + * * if the frame is allowed on the LAN + * + * In these cases, the skb is further handled by this function + * + * Return: true if handled, otherwise it returns false and the caller shall + * further process the skb. + */ +bool batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, + unsigned short vid, int packet_type) +{ + struct batadv_bla_backbone_gw *backbone_gw; + struct ethhdr *ethhdr; + struct batadv_bla_claim search_claim, *claim = NULL; + struct batadv_hard_iface *primary_if; + bool own_claim; + bool ret; + + ethhdr = eth_hdr(skb); + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + goto handled; + + if (!atomic_read(&bat_priv->bridge_loop_avoidance)) + goto allow; + + if (batadv_bla_loopdetect_check(bat_priv, skb, primary_if, vid)) + goto handled; + + if (unlikely(atomic_read(&bat_priv->bla.num_requests))) + /* don't allow multicast packets while requests are in flight */ + if (is_multicast_ether_addr(ethhdr->h_dest)) + /* Both broadcast flooding or multicast-via-unicasts + * delivery might send to multiple backbone gateways + * sharing the same LAN and therefore need to coordinate + * which backbone gateway forwards into the LAN, + * by claiming the payload source address. + * + * Broadcast flooding and multicast-via-unicasts + * delivery use the following two batman packet types. + * Note: explicitly exclude BATADV_UNICAST_4ADDR, + * as the DHCP gateway feature will send explicitly + * to only one BLA gateway, so the claiming process + * should be avoided there. + */ + if (packet_type == BATADV_BCAST || + packet_type == BATADV_UNICAST) + goto handled; + + /* potential duplicates from foreign BLA backbone gateways via + * multicast-in-unicast packets + */ + if (is_multicast_ether_addr(ethhdr->h_dest) && + packet_type == BATADV_UNICAST && + batadv_bla_check_ucast_duplist(bat_priv, skb)) + goto handled; + + ether_addr_copy(search_claim.addr, ethhdr->h_source); + search_claim.vid = vid; + claim = batadv_claim_hash_find(bat_priv, &search_claim); + + if (!claim) { + /* possible optimization: race for a claim */ + /* No claim exists yet, claim it for us! + */ + + batadv_dbg(BATADV_DBG_BLA, bat_priv, + "%s(): Unclaimed MAC %pM found. Claim it. Local: %s\n", + __func__, ethhdr->h_source, + batadv_is_my_client(bat_priv, + ethhdr->h_source, vid) ? + "yes" : "no"); + batadv_handle_claim(bat_priv, primary_if, + primary_if->net_dev->dev_addr, + ethhdr->h_source, vid); + goto allow; + } + + /* if it is our own claim ... */ + backbone_gw = batadv_bla_claim_get_backbone_gw(claim); + own_claim = batadv_compare_eth(backbone_gw->orig, + primary_if->net_dev->dev_addr); + batadv_backbone_gw_put(backbone_gw); + + if (own_claim) { + /* ... allow it in any case */ + claim->lasttime = jiffies; + goto allow; + } + + /* if it is a multicast ... */ + if (is_multicast_ether_addr(ethhdr->h_dest) && + (packet_type == BATADV_BCAST || packet_type == BATADV_UNICAST)) { + /* ... drop it. the responsible gateway is in charge. + * + * We need to check packet type because with the gateway + * feature, broadcasts (like DHCP requests) may be sent + * using a unicast 4 address packet type. See comment above. + */ + goto handled; + } else { + /* seems the client considers us as its best gateway. + * send a claim and update the claim table + * immediately. + */ + batadv_handle_claim(bat_priv, primary_if, + primary_if->net_dev->dev_addr, + ethhdr->h_source, vid); + goto allow; + } +allow: + batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); + ret = false; + goto out; + +handled: + kfree_skb(skb); + ret = true; + +out: + batadv_hardif_put(primary_if); + batadv_claim_put(claim); + return ret; +} + +/** + * batadv_bla_tx() - check packets going into the mesh + * @bat_priv: the bat priv with all the soft interface information + * @skb: the frame to be checked + * @vid: the VLAN ID of the frame + * + * batadv_bla_tx checks if: + * * a claim was received which has to be processed + * * the frame is allowed on the mesh + * + * in these cases, the skb is further handled by this function. + * + * This call might reallocate skb data. + * + * Return: true if handled, otherwise it returns false and the caller shall + * further process the skb. + */ +bool batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, + unsigned short vid) +{ + struct ethhdr *ethhdr; + struct batadv_bla_claim search_claim, *claim = NULL; + struct batadv_bla_backbone_gw *backbone_gw; + struct batadv_hard_iface *primary_if; + bool client_roamed; + bool ret = false; + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + goto out; + + if (!atomic_read(&bat_priv->bridge_loop_avoidance)) + goto allow; + + if (batadv_bla_process_claim(bat_priv, primary_if, skb)) + goto handled; + + ethhdr = eth_hdr(skb); + + if (unlikely(atomic_read(&bat_priv->bla.num_requests))) + /* don't allow broadcasts while requests are in flight */ + if (is_multicast_ether_addr(ethhdr->h_dest)) + goto handled; + + ether_addr_copy(search_claim.addr, ethhdr->h_source); + search_claim.vid = vid; + + claim = batadv_claim_hash_find(bat_priv, &search_claim); + + /* if no claim exists, allow it. */ + if (!claim) + goto allow; + + /* check if we are responsible. */ + backbone_gw = batadv_bla_claim_get_backbone_gw(claim); + client_roamed = batadv_compare_eth(backbone_gw->orig, + primary_if->net_dev->dev_addr); + batadv_backbone_gw_put(backbone_gw); + + if (client_roamed) { + /* if yes, the client has roamed and we have + * to unclaim it. + */ + if (batadv_has_timed_out(claim->lasttime, 100)) { + /* only unclaim if the last claim entry is + * older than 100 ms to make sure we really + * have a roaming client here. + */ + batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): Roaming client %pM detected. Unclaim it.\n", + __func__, ethhdr->h_source); + batadv_handle_unclaim(bat_priv, primary_if, + primary_if->net_dev->dev_addr, + ethhdr->h_source, vid); + goto allow; + } else { + batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): Race for claim %pM detected. Drop packet.\n", + __func__, ethhdr->h_source); + goto handled; + } + } + + /* check if it is a multicast/broadcast frame */ + if (is_multicast_ether_addr(ethhdr->h_dest)) { + /* drop it. the responsible gateway has forwarded it into + * the backbone network. + */ + goto handled; + } else { + /* we must allow it. at least if we are + * responsible for the DESTINATION. + */ + goto allow; + } +allow: + batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); + ret = false; + goto out; +handled: + ret = true; +out: + batadv_hardif_put(primary_if); + batadv_claim_put(claim); + return ret; +} + +/** + * batadv_bla_claim_dump_entry() - dump one entry of the claim table + * to a netlink socket + * @msg: buffer for the message + * @portid: netlink port + * @cb: Control block containing additional options + * @primary_if: primary interface + * @claim: entry to dump + * + * Return: 0 or error code. + */ +static int +batadv_bla_claim_dump_entry(struct sk_buff *msg, u32 portid, + struct netlink_callback *cb, + struct batadv_hard_iface *primary_if, + struct batadv_bla_claim *claim) +{ + const u8 *primary_addr = primary_if->net_dev->dev_addr; + u16 backbone_crc; + bool is_own; + void *hdr; + int ret = -EINVAL; + + hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq, + &batadv_netlink_family, NLM_F_MULTI, + BATADV_CMD_GET_BLA_CLAIM); + if (!hdr) { + ret = -ENOBUFS; + goto out; + } + + genl_dump_check_consistent(cb, hdr); + + is_own = batadv_compare_eth(claim->backbone_gw->orig, + primary_addr); + + spin_lock_bh(&claim->backbone_gw->crc_lock); + backbone_crc = claim->backbone_gw->crc; + spin_unlock_bh(&claim->backbone_gw->crc_lock); + + if (is_own) + if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) { + genlmsg_cancel(msg, hdr); + goto out; + } + + if (nla_put(msg, BATADV_ATTR_BLA_ADDRESS, ETH_ALEN, claim->addr) || + nla_put_u16(msg, BATADV_ATTR_BLA_VID, claim->vid) || + nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN, + claim->backbone_gw->orig) || + nla_put_u16(msg, BATADV_ATTR_BLA_CRC, + backbone_crc)) { + genlmsg_cancel(msg, hdr); + goto out; + } + + genlmsg_end(msg, hdr); + ret = 0; + +out: + return ret; +} + +/** + * batadv_bla_claim_dump_bucket() - dump one bucket of the claim table + * to a netlink socket + * @msg: buffer for the message + * @portid: netlink port + * @cb: Control block containing additional options + * @primary_if: primary interface + * @hash: hash to dump + * @bucket: bucket index to dump + * @idx_skip: How many entries to skip + * + * Return: always 0. + */ +static int +batadv_bla_claim_dump_bucket(struct sk_buff *msg, u32 portid, + struct netlink_callback *cb, + struct batadv_hard_iface *primary_if, + struct batadv_hashtable *hash, unsigned int bucket, + int *idx_skip) +{ + struct batadv_bla_claim *claim; + int idx = 0; + int ret = 0; + + spin_lock_bh(&hash->list_locks[bucket]); + cb->seq = atomic_read(&hash->generation) << 1 | 1; + + hlist_for_each_entry(claim, &hash->table[bucket], hash_entry) { + if (idx++ < *idx_skip) + continue; + + ret = batadv_bla_claim_dump_entry(msg, portid, cb, + primary_if, claim); + if (ret) { + *idx_skip = idx - 1; + goto unlock; + } + } + + *idx_skip = 0; +unlock: + spin_unlock_bh(&hash->list_locks[bucket]); + return ret; +} + +/** + * batadv_bla_claim_dump() - dump claim table to a netlink socket + * @msg: buffer for the message + * @cb: callback structure containing arguments + * + * Return: message length. + */ +int batadv_bla_claim_dump(struct sk_buff *msg, struct netlink_callback *cb) +{ + struct batadv_hard_iface *primary_if = NULL; + int portid = NETLINK_CB(cb->skb).portid; + struct net *net = sock_net(cb->skb->sk); + struct net_device *soft_iface; + struct batadv_hashtable *hash; + struct batadv_priv *bat_priv; + int bucket = cb->args[0]; + int idx = cb->args[1]; + int ifindex; + int ret = 0; + + ifindex = batadv_netlink_get_ifindex(cb->nlh, + BATADV_ATTR_MESH_IFINDEX); + if (!ifindex) + return -EINVAL; + + soft_iface = dev_get_by_index(net, ifindex); + if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { + ret = -ENODEV; + goto out; + } + + bat_priv = netdev_priv(soft_iface); + hash = bat_priv->bla.claim_hash; + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { + ret = -ENOENT; + goto out; + } + + while (bucket < hash->size) { + if (batadv_bla_claim_dump_bucket(msg, portid, cb, primary_if, + hash, bucket, &idx)) + break; + bucket++; + } + + cb->args[0] = bucket; + cb->args[1] = idx; + + ret = msg->len; + +out: + batadv_hardif_put(primary_if); + + dev_put(soft_iface); + + return ret; +} + +/** + * batadv_bla_backbone_dump_entry() - dump one entry of the backbone table to a + * netlink socket + * @msg: buffer for the message + * @portid: netlink port + * @cb: Control block containing additional options + * @primary_if: primary interface + * @backbone_gw: entry to dump + * + * Return: 0 or error code. + */ +static int +batadv_bla_backbone_dump_entry(struct sk_buff *msg, u32 portid, + struct netlink_callback *cb, + struct batadv_hard_iface *primary_if, + struct batadv_bla_backbone_gw *backbone_gw) +{ + const u8 *primary_addr = primary_if->net_dev->dev_addr; + u16 backbone_crc; + bool is_own; + int msecs; + void *hdr; + int ret = -EINVAL; + + hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq, + &batadv_netlink_family, NLM_F_MULTI, + BATADV_CMD_GET_BLA_BACKBONE); + if (!hdr) { + ret = -ENOBUFS; + goto out; + } + + genl_dump_check_consistent(cb, hdr); + + is_own = batadv_compare_eth(backbone_gw->orig, primary_addr); + + spin_lock_bh(&backbone_gw->crc_lock); + backbone_crc = backbone_gw->crc; + spin_unlock_bh(&backbone_gw->crc_lock); + + msecs = jiffies_to_msecs(jiffies - backbone_gw->lasttime); + + if (is_own) + if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) { + genlmsg_cancel(msg, hdr); + goto out; + } + + if (nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN, + backbone_gw->orig) || + nla_put_u16(msg, BATADV_ATTR_BLA_VID, backbone_gw->vid) || + nla_put_u16(msg, BATADV_ATTR_BLA_CRC, + backbone_crc) || + nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, msecs)) { + genlmsg_cancel(msg, hdr); + goto out; + } + + genlmsg_end(msg, hdr); + ret = 0; + +out: + return ret; +} + +/** + * batadv_bla_backbone_dump_bucket() - dump one bucket of the backbone table to + * a netlink socket + * @msg: buffer for the message + * @portid: netlink port + * @cb: Control block containing additional options + * @primary_if: primary interface + * @hash: hash to dump + * @bucket: bucket index to dump + * @idx_skip: How many entries to skip + * + * Return: always 0. + */ +static int +batadv_bla_backbone_dump_bucket(struct sk_buff *msg, u32 portid, + struct netlink_callback *cb, + struct batadv_hard_iface *primary_if, + struct batadv_hashtable *hash, + unsigned int bucket, int *idx_skip) +{ + struct batadv_bla_backbone_gw *backbone_gw; + int idx = 0; + int ret = 0; + + spin_lock_bh(&hash->list_locks[bucket]); + cb->seq = atomic_read(&hash->generation) << 1 | 1; + + hlist_for_each_entry(backbone_gw, &hash->table[bucket], hash_entry) { + if (idx++ < *idx_skip) + continue; + + ret = batadv_bla_backbone_dump_entry(msg, portid, cb, + primary_if, backbone_gw); + if (ret) { + *idx_skip = idx - 1; + goto unlock; + } + } + + *idx_skip = 0; +unlock: + spin_unlock_bh(&hash->list_locks[bucket]); + return ret; +} + +/** + * batadv_bla_backbone_dump() - dump backbone table to a netlink socket + * @msg: buffer for the message + * @cb: callback structure containing arguments + * + * Return: message length. + */ +int batadv_bla_backbone_dump(struct sk_buff *msg, struct netlink_callback *cb) +{ + struct batadv_hard_iface *primary_if = NULL; + int portid = NETLINK_CB(cb->skb).portid; + struct net *net = sock_net(cb->skb->sk); + struct net_device *soft_iface; + struct batadv_hashtable *hash; + struct batadv_priv *bat_priv; + int bucket = cb->args[0]; + int idx = cb->args[1]; + int ifindex; + int ret = 0; + + ifindex = batadv_netlink_get_ifindex(cb->nlh, + BATADV_ATTR_MESH_IFINDEX); + if (!ifindex) + return -EINVAL; + + soft_iface = dev_get_by_index(net, ifindex); + if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { + ret = -ENODEV; + goto out; + } + + bat_priv = netdev_priv(soft_iface); + hash = bat_priv->bla.backbone_hash; + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { + ret = -ENOENT; + goto out; + } + + while (bucket < hash->size) { + if (batadv_bla_backbone_dump_bucket(msg, portid, cb, primary_if, + hash, bucket, &idx)) + break; + bucket++; + } + + cb->args[0] = bucket; + cb->args[1] = idx; + + ret = msg->len; + +out: + batadv_hardif_put(primary_if); + + dev_put(soft_iface); + + return ret; +} + +#ifdef CONFIG_BATMAN_ADV_DAT +/** + * batadv_bla_check_claim() - check if address is claimed + * + * @bat_priv: the bat priv with all the soft interface information + * @addr: mac address of which the claim status is checked + * @vid: the VLAN ID + * + * addr is checked if this address is claimed by the local device itself. + * + * Return: true if bla is disabled or the mac is claimed by the device, + * false if the device addr is already claimed by another gateway + */ +bool batadv_bla_check_claim(struct batadv_priv *bat_priv, + u8 *addr, unsigned short vid) +{ + struct batadv_bla_claim search_claim; + struct batadv_bla_claim *claim = NULL; + struct batadv_hard_iface *primary_if = NULL; + bool ret = true; + + if (!atomic_read(&bat_priv->bridge_loop_avoidance)) + return ret; + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + return ret; + + /* First look if the mac address is claimed */ + ether_addr_copy(search_claim.addr, addr); + search_claim.vid = vid; + + claim = batadv_claim_hash_find(bat_priv, &search_claim); + + /* If there is a claim and we are not owner of the claim, + * return false. + */ + if (claim) { + if (!batadv_compare_eth(claim->backbone_gw->orig, + primary_if->net_dev->dev_addr)) + ret = false; + batadv_claim_put(claim); + } + + batadv_hardif_put(primary_if); + return ret; +} +#endif diff --git a/net/batman-adv/bridge_loop_avoidance.h b/net/batman-adv/bridge_loop_avoidance.h new file mode 100644 index 000000000..8673a2659 --- /dev/null +++ b/net/batman-adv/bridge_loop_avoidance.h @@ -0,0 +1,132 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Simon Wunderlich + */ + +#ifndef _NET_BATMAN_ADV_BLA_H_ +#define _NET_BATMAN_ADV_BLA_H_ + +#include "main.h" + +#include <linux/compiler.h> +#include <linux/netdevice.h> +#include <linux/netlink.h> +#include <linux/skbuff.h> +#include <linux/stddef.h> +#include <linux/types.h> + +/** + * batadv_bla_is_loopdetect_mac() - check if the mac address is from a loop + * detect frame sent by bridge loop avoidance + * @mac: mac address to check + * + * Return: true if the it looks like a loop detect frame + * (mac starts with BA:BE), false otherwise + */ +static inline bool batadv_bla_is_loopdetect_mac(const uint8_t *mac) +{ + if (mac[0] == 0xba && mac[1] == 0xbe) + return true; + + return false; +} + +#ifdef CONFIG_BATMAN_ADV_BLA +bool batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, + unsigned short vid, int packet_type); +bool batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, + unsigned short vid); +bool batadv_bla_is_backbone_gw(struct sk_buff *skb, + struct batadv_orig_node *orig_node, + int hdr_size); +int batadv_bla_claim_dump(struct sk_buff *msg, struct netlink_callback *cb); +int batadv_bla_backbone_dump(struct sk_buff *msg, struct netlink_callback *cb); +bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig, + unsigned short vid); +bool batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, + struct sk_buff *skb); +void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, + struct batadv_hard_iface *primary_if, + struct batadv_hard_iface *oldif); +void batadv_bla_status_update(struct net_device *net_dev); +int batadv_bla_init(struct batadv_priv *bat_priv); +void batadv_bla_free(struct batadv_priv *bat_priv); +#ifdef CONFIG_BATMAN_ADV_DAT +bool batadv_bla_check_claim(struct batadv_priv *bat_priv, u8 *addr, + unsigned short vid); +#endif +#define BATADV_BLA_CRC_INIT 0 +#else /* ifdef CONFIG_BATMAN_ADV_BLA */ + +static inline bool batadv_bla_rx(struct batadv_priv *bat_priv, + struct sk_buff *skb, unsigned short vid, + int packet_type) +{ + return false; +} + +static inline bool batadv_bla_tx(struct batadv_priv *bat_priv, + struct sk_buff *skb, unsigned short vid) +{ + return false; +} + +static inline bool batadv_bla_is_backbone_gw(struct sk_buff *skb, + struct batadv_orig_node *orig_node, + int hdr_size) +{ + return false; +} + +static inline bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, + u8 *orig, unsigned short vid) +{ + return false; +} + +static inline bool +batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, + struct sk_buff *skb) +{ + return false; +} + +static inline void +batadv_bla_update_orig_address(struct batadv_priv *bat_priv, + struct batadv_hard_iface *primary_if, + struct batadv_hard_iface *oldif) +{ +} + +static inline int batadv_bla_init(struct batadv_priv *bat_priv) +{ + return 1; +} + +static inline void batadv_bla_free(struct batadv_priv *bat_priv) +{ +} + +static inline int batadv_bla_claim_dump(struct sk_buff *msg, + struct netlink_callback *cb) +{ + return -EOPNOTSUPP; +} + +static inline int batadv_bla_backbone_dump(struct sk_buff *msg, + struct netlink_callback *cb) +{ + return -EOPNOTSUPP; +} + +static inline +bool batadv_bla_check_claim(struct batadv_priv *bat_priv, u8 *addr, + unsigned short vid) +{ + return true; +} + +#endif /* ifdef CONFIG_BATMAN_ADV_BLA */ + +#endif /* ifndef _NET_BATMAN_ADV_BLA_H_ */ diff --git a/net/batman-adv/distributed-arp-table.c b/net/batman-adv/distributed-arp-table.c new file mode 100644 index 000000000..a02332520 --- /dev/null +++ b/net/batman-adv/distributed-arp-table.c @@ -0,0 +1,1831 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Antonio Quartulli + */ + +#include "distributed-arp-table.h" +#include "main.h" + +#include <asm/unaligned.h> +#include <linux/atomic.h> +#include <linux/bitops.h> +#include <linux/byteorder/generic.h> +#include <linux/container_of.h> +#include <linux/errno.h> +#include <linux/etherdevice.h> +#include <linux/gfp.h> +#include <linux/if_arp.h> +#include <linux/if_ether.h> +#include <linux/if_vlan.h> +#include <linux/in.h> +#include <linux/ip.h> +#include <linux/jiffies.h> +#include <linux/kref.h> +#include <linux/list.h> +#include <linux/netlink.h> +#include <linux/rculist.h> +#include <linux/rcupdate.h> +#include <linux/skbuff.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/stddef.h> +#include <linux/string.h> +#include <linux/udp.h> +#include <linux/workqueue.h> +#include <net/arp.h> +#include <net/genetlink.h> +#include <net/netlink.h> +#include <net/sock.h> +#include <uapi/linux/batman_adv.h> + +#include "bridge_loop_avoidance.h" +#include "hard-interface.h" +#include "hash.h" +#include "log.h" +#include "netlink.h" +#include "originator.h" +#include "send.h" +#include "soft-interface.h" +#include "translation-table.h" +#include "tvlv.h" + +enum batadv_bootpop { + BATADV_BOOTREPLY = 2, +}; + +enum batadv_boothtype { + BATADV_HTYPE_ETHERNET = 1, +}; + +enum batadv_dhcpoptioncode { + BATADV_DHCP_OPT_PAD = 0, + BATADV_DHCP_OPT_MSG_TYPE = 53, + BATADV_DHCP_OPT_END = 255, +}; + +enum batadv_dhcptype { + BATADV_DHCPACK = 5, +}; + +/* { 99, 130, 83, 99 } */ +#define BATADV_DHCP_MAGIC 1669485411 + +struct batadv_dhcp_packet { + __u8 op; + __u8 htype; + __u8 hlen; + __u8 hops; + __be32 xid; + __be16 secs; + __be16 flags; + __be32 ciaddr; + __be32 yiaddr; + __be32 siaddr; + __be32 giaddr; + __u8 chaddr[16]; + __u8 sname[64]; + __u8 file[128]; + __be32 magic; + /* __u8 options[]; */ +}; + +#define BATADV_DHCP_YIADDR_LEN sizeof(((struct batadv_dhcp_packet *)0)->yiaddr) +#define BATADV_DHCP_CHADDR_LEN sizeof(((struct batadv_dhcp_packet *)0)->chaddr) + +static void batadv_dat_purge(struct work_struct *work); + +/** + * batadv_dat_start_timer() - initialise the DAT periodic worker + * @bat_priv: the bat priv with all the soft interface information + */ +static void batadv_dat_start_timer(struct batadv_priv *bat_priv) +{ + queue_delayed_work(batadv_event_workqueue, &bat_priv->dat.work, + msecs_to_jiffies(10000)); +} + +/** + * batadv_dat_entry_release() - release dat_entry from lists and queue for free + * after rcu grace period + * @ref: kref pointer of the dat_entry + */ +static void batadv_dat_entry_release(struct kref *ref) +{ + struct batadv_dat_entry *dat_entry; + + dat_entry = container_of(ref, struct batadv_dat_entry, refcount); + + kfree_rcu(dat_entry, rcu); +} + +/** + * batadv_dat_entry_put() - decrement the dat_entry refcounter and possibly + * release it + * @dat_entry: dat_entry to be free'd + */ +static void batadv_dat_entry_put(struct batadv_dat_entry *dat_entry) +{ + if (!dat_entry) + return; + + kref_put(&dat_entry->refcount, batadv_dat_entry_release); +} + +/** + * batadv_dat_to_purge() - check whether a dat_entry has to be purged or not + * @dat_entry: the entry to check + * + * Return: true if the entry has to be purged now, false otherwise. + */ +static bool batadv_dat_to_purge(struct batadv_dat_entry *dat_entry) +{ + return batadv_has_timed_out(dat_entry->last_update, + BATADV_DAT_ENTRY_TIMEOUT); +} + +/** + * __batadv_dat_purge() - delete entries from the DAT local storage + * @bat_priv: the bat priv with all the soft interface information + * @to_purge: function in charge to decide whether an entry has to be purged or + * not. This function takes the dat_entry as argument and has to + * returns a boolean value: true is the entry has to be deleted, + * false otherwise + * + * Loops over each entry in the DAT local storage and deletes it if and only if + * the to_purge function passed as argument returns true. + */ +static void __batadv_dat_purge(struct batadv_priv *bat_priv, + bool (*to_purge)(struct batadv_dat_entry *)) +{ + spinlock_t *list_lock; /* protects write access to the hash lists */ + struct batadv_dat_entry *dat_entry; + struct hlist_node *node_tmp; + struct hlist_head *head; + u32 i; + + if (!bat_priv->dat.hash) + return; + + for (i = 0; i < bat_priv->dat.hash->size; i++) { + head = &bat_priv->dat.hash->table[i]; + list_lock = &bat_priv->dat.hash->list_locks[i]; + + spin_lock_bh(list_lock); + hlist_for_each_entry_safe(dat_entry, node_tmp, head, + hash_entry) { + /* if a helper function has been passed as parameter, + * ask it if the entry has to be purged or not + */ + if (to_purge && !to_purge(dat_entry)) + continue; + + hlist_del_rcu(&dat_entry->hash_entry); + batadv_dat_entry_put(dat_entry); + } + spin_unlock_bh(list_lock); + } +} + +/** + * batadv_dat_purge() - periodic task that deletes old entries from the local + * DAT hash table + * @work: kernel work struct + */ +static void batadv_dat_purge(struct work_struct *work) +{ + struct delayed_work *delayed_work; + struct batadv_priv_dat *priv_dat; + struct batadv_priv *bat_priv; + + delayed_work = to_delayed_work(work); + priv_dat = container_of(delayed_work, struct batadv_priv_dat, work); + bat_priv = container_of(priv_dat, struct batadv_priv, dat); + + __batadv_dat_purge(bat_priv, batadv_dat_to_purge); + batadv_dat_start_timer(bat_priv); +} + +/** + * batadv_compare_dat() - comparing function used in the local DAT hash table + * @node: node in the local table + * @data2: second object to compare the node to + * + * Return: true if the two entries are the same, false otherwise. + */ +static bool batadv_compare_dat(const struct hlist_node *node, const void *data2) +{ + const void *data1 = container_of(node, struct batadv_dat_entry, + hash_entry); + + return memcmp(data1, data2, sizeof(__be32)) == 0; +} + +/** + * batadv_arp_hw_src() - extract the hw_src field from an ARP packet + * @skb: ARP packet + * @hdr_size: size of the possible header before the ARP packet + * + * Return: the value of the hw_src field in the ARP packet. + */ +static u8 *batadv_arp_hw_src(struct sk_buff *skb, int hdr_size) +{ + u8 *addr; + + addr = (u8 *)(skb->data + hdr_size); + addr += ETH_HLEN + sizeof(struct arphdr); + + return addr; +} + +/** + * batadv_arp_ip_src() - extract the ip_src field from an ARP packet + * @skb: ARP packet + * @hdr_size: size of the possible header before the ARP packet + * + * Return: the value of the ip_src field in the ARP packet. + */ +static __be32 batadv_arp_ip_src(struct sk_buff *skb, int hdr_size) +{ + return *(__force __be32 *)(batadv_arp_hw_src(skb, hdr_size) + ETH_ALEN); +} + +/** + * batadv_arp_hw_dst() - extract the hw_dst field from an ARP packet + * @skb: ARP packet + * @hdr_size: size of the possible header before the ARP packet + * + * Return: the value of the hw_dst field in the ARP packet. + */ +static u8 *batadv_arp_hw_dst(struct sk_buff *skb, int hdr_size) +{ + return batadv_arp_hw_src(skb, hdr_size) + ETH_ALEN + 4; +} + +/** + * batadv_arp_ip_dst() - extract the ip_dst field from an ARP packet + * @skb: ARP packet + * @hdr_size: size of the possible header before the ARP packet + * + * Return: the value of the ip_dst field in the ARP packet. + */ +static __be32 batadv_arp_ip_dst(struct sk_buff *skb, int hdr_size) +{ + u8 *dst = batadv_arp_hw_src(skb, hdr_size) + ETH_ALEN * 2 + 4; + + return *(__force __be32 *)dst; +} + +/** + * batadv_hash_dat() - compute the hash value for an IP address + * @data: data to hash + * @size: size of the hash table + * + * Return: the selected index in the hash table for the given data. + */ +static u32 batadv_hash_dat(const void *data, u32 size) +{ + u32 hash = 0; + const struct batadv_dat_entry *dat = data; + const unsigned char *key; + __be16 vid; + u32 i; + + key = (__force const unsigned char *)&dat->ip; + for (i = 0; i < sizeof(dat->ip); i++) { + hash += key[i]; + hash += (hash << 10); + hash ^= (hash >> 6); + } + + vid = htons(dat->vid); + key = (__force const unsigned char *)&vid; + for (i = 0; i < sizeof(dat->vid); i++) { + hash += key[i]; + hash += (hash << 10); + hash ^= (hash >> 6); + } + + hash += (hash << 3); + hash ^= (hash >> 11); + hash += (hash << 15); + + return hash % size; +} + +/** + * batadv_dat_entry_hash_find() - look for a given dat_entry in the local hash + * table + * @bat_priv: the bat priv with all the soft interface information + * @ip: search key + * @vid: VLAN identifier + * + * Return: the dat_entry if found, NULL otherwise. + */ +static struct batadv_dat_entry * +batadv_dat_entry_hash_find(struct batadv_priv *bat_priv, __be32 ip, + unsigned short vid) +{ + struct hlist_head *head; + struct batadv_dat_entry to_find, *dat_entry, *dat_entry_tmp = NULL; + struct batadv_hashtable *hash = bat_priv->dat.hash; + u32 index; + + if (!hash) + return NULL; + + to_find.ip = ip; + to_find.vid = vid; + + index = batadv_hash_dat(&to_find, hash->size); + head = &hash->table[index]; + + rcu_read_lock(); + hlist_for_each_entry_rcu(dat_entry, head, hash_entry) { + if (dat_entry->ip != ip) + continue; + + if (!kref_get_unless_zero(&dat_entry->refcount)) + continue; + + dat_entry_tmp = dat_entry; + break; + } + rcu_read_unlock(); + + return dat_entry_tmp; +} + +/** + * batadv_dat_entry_add() - add a new dat entry or update it if already exists + * @bat_priv: the bat priv with all the soft interface information + * @ip: ipv4 to add/edit + * @mac_addr: mac address to assign to the given ipv4 + * @vid: VLAN identifier + */ +static void batadv_dat_entry_add(struct batadv_priv *bat_priv, __be32 ip, + u8 *mac_addr, unsigned short vid) +{ + struct batadv_dat_entry *dat_entry; + int hash_added; + + dat_entry = batadv_dat_entry_hash_find(bat_priv, ip, vid); + /* if this entry is already known, just update it */ + if (dat_entry) { + if (!batadv_compare_eth(dat_entry->mac_addr, mac_addr)) + ether_addr_copy(dat_entry->mac_addr, mac_addr); + dat_entry->last_update = jiffies; + batadv_dbg(BATADV_DBG_DAT, bat_priv, + "Entry updated: %pI4 %pM (vid: %d)\n", + &dat_entry->ip, dat_entry->mac_addr, + batadv_print_vid(vid)); + goto out; + } + + dat_entry = kmalloc(sizeof(*dat_entry), GFP_ATOMIC); + if (!dat_entry) + goto out; + + dat_entry->ip = ip; + dat_entry->vid = vid; + ether_addr_copy(dat_entry->mac_addr, mac_addr); + dat_entry->last_update = jiffies; + kref_init(&dat_entry->refcount); + + kref_get(&dat_entry->refcount); + hash_added = batadv_hash_add(bat_priv->dat.hash, batadv_compare_dat, + batadv_hash_dat, dat_entry, + &dat_entry->hash_entry); + + if (unlikely(hash_added != 0)) { + /* remove the reference for the hash */ + batadv_dat_entry_put(dat_entry); + goto out; + } + + batadv_dbg(BATADV_DBG_DAT, bat_priv, "New entry added: %pI4 %pM (vid: %d)\n", + &dat_entry->ip, dat_entry->mac_addr, batadv_print_vid(vid)); + +out: + batadv_dat_entry_put(dat_entry); +} + +#ifdef CONFIG_BATMAN_ADV_DEBUG + +/** + * batadv_dbg_arp() - print a debug message containing all the ARP packet + * details + * @bat_priv: the bat priv with all the soft interface information + * @skb: ARP packet + * @hdr_size: size of the possible header before the ARP packet + * @msg: message to print together with the debugging information + */ +static void batadv_dbg_arp(struct batadv_priv *bat_priv, struct sk_buff *skb, + int hdr_size, char *msg) +{ + struct batadv_unicast_4addr_packet *unicast_4addr_packet; + struct batadv_bcast_packet *bcast_pkt; + u8 *orig_addr; + __be32 ip_src, ip_dst; + + if (msg) + batadv_dbg(BATADV_DBG_DAT, bat_priv, "%s\n", msg); + + ip_src = batadv_arp_ip_src(skb, hdr_size); + ip_dst = batadv_arp_ip_dst(skb, hdr_size); + batadv_dbg(BATADV_DBG_DAT, bat_priv, + "ARP MSG = [src: %pM-%pI4 dst: %pM-%pI4]\n", + batadv_arp_hw_src(skb, hdr_size), &ip_src, + batadv_arp_hw_dst(skb, hdr_size), &ip_dst); + + if (hdr_size < sizeof(struct batadv_unicast_packet)) + return; + + unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; + + switch (unicast_4addr_packet->u.packet_type) { + case BATADV_UNICAST: + batadv_dbg(BATADV_DBG_DAT, bat_priv, + "* encapsulated within a UNICAST packet\n"); + break; + case BATADV_UNICAST_4ADDR: + batadv_dbg(BATADV_DBG_DAT, bat_priv, + "* encapsulated within a UNICAST_4ADDR packet (src: %pM)\n", + unicast_4addr_packet->src); + switch (unicast_4addr_packet->subtype) { + case BATADV_P_DAT_DHT_PUT: + batadv_dbg(BATADV_DBG_DAT, bat_priv, "* type: DAT_DHT_PUT\n"); + break; + case BATADV_P_DAT_DHT_GET: + batadv_dbg(BATADV_DBG_DAT, bat_priv, "* type: DAT_DHT_GET\n"); + break; + case BATADV_P_DAT_CACHE_REPLY: + batadv_dbg(BATADV_DBG_DAT, bat_priv, + "* type: DAT_CACHE_REPLY\n"); + break; + case BATADV_P_DATA: + batadv_dbg(BATADV_DBG_DAT, bat_priv, "* type: DATA\n"); + break; + default: + batadv_dbg(BATADV_DBG_DAT, bat_priv, "* type: Unknown (%u)!\n", + unicast_4addr_packet->u.packet_type); + } + break; + case BATADV_BCAST: + bcast_pkt = (struct batadv_bcast_packet *)unicast_4addr_packet; + orig_addr = bcast_pkt->orig; + batadv_dbg(BATADV_DBG_DAT, bat_priv, + "* encapsulated within a BCAST packet (src: %pM)\n", + orig_addr); + break; + default: + batadv_dbg(BATADV_DBG_DAT, bat_priv, + "* encapsulated within an unknown packet type (0x%x)\n", + unicast_4addr_packet->u.packet_type); + } +} + +#else + +static void batadv_dbg_arp(struct batadv_priv *bat_priv, struct sk_buff *skb, + int hdr_size, char *msg) +{ +} + +#endif /* CONFIG_BATMAN_ADV_DEBUG */ + +/** + * batadv_is_orig_node_eligible() - check whether a node can be a DHT candidate + * @res: the array with the already selected candidates + * @select: number of already selected candidates + * @tmp_max: address of the currently evaluated node + * @max: current round max address + * @last_max: address of the last selected candidate + * @candidate: orig_node under evaluation + * @max_orig_node: last selected candidate + * + * Return: true if the node has been elected as next candidate or false + * otherwise. + */ +static bool batadv_is_orig_node_eligible(struct batadv_dat_candidate *res, + int select, batadv_dat_addr_t tmp_max, + batadv_dat_addr_t max, + batadv_dat_addr_t last_max, + struct batadv_orig_node *candidate, + struct batadv_orig_node *max_orig_node) +{ + bool ret = false; + int j; + + /* check if orig node candidate is running DAT */ + if (!test_bit(BATADV_ORIG_CAPA_HAS_DAT, &candidate->capabilities)) + goto out; + + /* Check if this node has already been selected... */ + for (j = 0; j < select; j++) + if (res[j].orig_node == candidate) + break; + /* ..and possibly skip it */ + if (j < select) + goto out; + /* sanity check: has it already been selected? This should not happen */ + if (tmp_max > last_max) + goto out; + /* check if during this iteration an originator with a closer dht + * address has already been found + */ + if (tmp_max < max) + goto out; + /* this is an hash collision with the temporary selected node. Choose + * the one with the lowest address + */ + if (tmp_max == max && max_orig_node && + batadv_compare_eth(candidate->orig, max_orig_node->orig)) + goto out; + + ret = true; +out: + return ret; +} + +/** + * batadv_choose_next_candidate() - select the next DHT candidate + * @bat_priv: the bat priv with all the soft interface information + * @cands: candidates array + * @select: number of candidates already present in the array + * @ip_key: key to look up in the DHT + * @last_max: pointer where the address of the selected candidate will be saved + */ +static void batadv_choose_next_candidate(struct batadv_priv *bat_priv, + struct batadv_dat_candidate *cands, + int select, batadv_dat_addr_t ip_key, + batadv_dat_addr_t *last_max) +{ + batadv_dat_addr_t max = 0; + batadv_dat_addr_t tmp_max = 0; + struct batadv_orig_node *orig_node, *max_orig_node = NULL; + struct batadv_hashtable *hash = bat_priv->orig_hash; + struct hlist_head *head; + int i; + + /* if no node is eligible as candidate, leave the candidate type as + * NOT_FOUND + */ + cands[select].type = BATADV_DAT_CANDIDATE_NOT_FOUND; + + /* iterate over the originator list and find the node with the closest + * dat_address which has not been selected yet + */ + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + rcu_read_lock(); + hlist_for_each_entry_rcu(orig_node, head, hash_entry) { + /* the dht space is a ring using unsigned addresses */ + tmp_max = BATADV_DAT_ADDR_MAX - orig_node->dat_addr + + ip_key; + + if (!batadv_is_orig_node_eligible(cands, select, + tmp_max, max, + *last_max, orig_node, + max_orig_node)) + continue; + + if (!kref_get_unless_zero(&orig_node->refcount)) + continue; + + max = tmp_max; + batadv_orig_node_put(max_orig_node); + max_orig_node = orig_node; + } + rcu_read_unlock(); + } + if (max_orig_node) { + cands[select].type = BATADV_DAT_CANDIDATE_ORIG; + cands[select].orig_node = max_orig_node; + batadv_dbg(BATADV_DBG_DAT, bat_priv, + "dat_select_candidates() %d: selected %pM addr=%u dist=%u\n", + select, max_orig_node->orig, max_orig_node->dat_addr, + max); + } + *last_max = max; +} + +/** + * batadv_dat_select_candidates() - select the nodes which the DHT message has + * to be sent to + * @bat_priv: the bat priv with all the soft interface information + * @ip_dst: ipv4 to look up in the DHT + * @vid: VLAN identifier + * + * An originator O is selected if and only if its DHT_ID value is one of three + * closest values (from the LEFT, with wrap around if needed) then the hash + * value of the key. ip_dst is the key. + * + * Return: the candidate array of size BATADV_DAT_CANDIDATE_NUM. + */ +static struct batadv_dat_candidate * +batadv_dat_select_candidates(struct batadv_priv *bat_priv, __be32 ip_dst, + unsigned short vid) +{ + int select; + batadv_dat_addr_t last_max = BATADV_DAT_ADDR_MAX, ip_key; + struct batadv_dat_candidate *res; + struct batadv_dat_entry dat; + + if (!bat_priv->orig_hash) + return NULL; + + res = kmalloc_array(BATADV_DAT_CANDIDATES_NUM, sizeof(*res), + GFP_ATOMIC); + if (!res) + return NULL; + + dat.ip = ip_dst; + dat.vid = vid; + ip_key = (batadv_dat_addr_t)batadv_hash_dat(&dat, + BATADV_DAT_ADDR_MAX); + + batadv_dbg(BATADV_DBG_DAT, bat_priv, + "%s(): IP=%pI4 hash(IP)=%u\n", __func__, &ip_dst, + ip_key); + + for (select = 0; select < BATADV_DAT_CANDIDATES_NUM; select++) + batadv_choose_next_candidate(bat_priv, res, select, ip_key, + &last_max); + + return res; +} + +/** + * batadv_dat_forward_data() - copy and send payload to the selected candidates + * @bat_priv: the bat priv with all the soft interface information + * @skb: payload to send + * @ip: the DHT key + * @vid: VLAN identifier + * @packet_subtype: unicast4addr packet subtype to use + * + * This function copies the skb with pskb_copy() and is sent as a unicast packet + * to each of the selected candidates. + * + * Return: true if the packet is sent to at least one candidate, false + * otherwise. + */ +static bool batadv_dat_forward_data(struct batadv_priv *bat_priv, + struct sk_buff *skb, __be32 ip, + unsigned short vid, int packet_subtype) +{ + int i; + bool ret = false; + int send_status; + struct batadv_neigh_node *neigh_node = NULL; + struct sk_buff *tmp_skb; + struct batadv_dat_candidate *cand; + + cand = batadv_dat_select_candidates(bat_priv, ip, vid); + if (!cand) + goto out; + + batadv_dbg(BATADV_DBG_DAT, bat_priv, "DHT_SEND for %pI4\n", &ip); + + for (i = 0; i < BATADV_DAT_CANDIDATES_NUM; i++) { + if (cand[i].type == BATADV_DAT_CANDIDATE_NOT_FOUND) + continue; + + neigh_node = batadv_orig_router_get(cand[i].orig_node, + BATADV_IF_DEFAULT); + if (!neigh_node) + goto free_orig; + + tmp_skb = pskb_copy_for_clone(skb, GFP_ATOMIC); + if (!batadv_send_skb_prepare_unicast_4addr(bat_priv, tmp_skb, + cand[i].orig_node, + packet_subtype)) { + kfree_skb(tmp_skb); + goto free_neigh; + } + + send_status = batadv_send_unicast_skb(tmp_skb, neigh_node); + if (send_status == NET_XMIT_SUCCESS) { + /* count the sent packet */ + switch (packet_subtype) { + case BATADV_P_DAT_DHT_GET: + batadv_inc_counter(bat_priv, + BATADV_CNT_DAT_GET_TX); + break; + case BATADV_P_DAT_DHT_PUT: + batadv_inc_counter(bat_priv, + BATADV_CNT_DAT_PUT_TX); + break; + } + + /* packet sent to a candidate: return true */ + ret = true; + } +free_neigh: + batadv_neigh_node_put(neigh_node); +free_orig: + batadv_orig_node_put(cand[i].orig_node); + } + +out: + kfree(cand); + return ret; +} + +/** + * batadv_dat_tvlv_container_update() - update the dat tvlv container after dat + * setting change + * @bat_priv: the bat priv with all the soft interface information + */ +static void batadv_dat_tvlv_container_update(struct batadv_priv *bat_priv) +{ + char dat_mode; + + dat_mode = atomic_read(&bat_priv->distributed_arp_table); + + switch (dat_mode) { + case 0: + batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_DAT, 1); + break; + case 1: + batadv_tvlv_container_register(bat_priv, BATADV_TVLV_DAT, 1, + NULL, 0); + break; + } +} + +/** + * batadv_dat_status_update() - update the dat tvlv container after dat + * setting change + * @net_dev: the soft interface net device + */ +void batadv_dat_status_update(struct net_device *net_dev) +{ + struct batadv_priv *bat_priv = netdev_priv(net_dev); + + batadv_dat_tvlv_container_update(bat_priv); +} + +/** + * batadv_dat_tvlv_ogm_handler_v1() - process incoming dat tvlv container + * @bat_priv: the bat priv with all the soft interface information + * @orig: the orig_node of the ogm + * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) + * @tvlv_value: tvlv buffer containing the gateway data + * @tvlv_value_len: tvlv buffer length + */ +static void batadv_dat_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig, + u8 flags, + void *tvlv_value, u16 tvlv_value_len) +{ + if (flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) + clear_bit(BATADV_ORIG_CAPA_HAS_DAT, &orig->capabilities); + else + set_bit(BATADV_ORIG_CAPA_HAS_DAT, &orig->capabilities); +} + +/** + * batadv_dat_hash_free() - free the local DAT hash table + * @bat_priv: the bat priv with all the soft interface information + */ +static void batadv_dat_hash_free(struct batadv_priv *bat_priv) +{ + if (!bat_priv->dat.hash) + return; + + __batadv_dat_purge(bat_priv, NULL); + + batadv_hash_destroy(bat_priv->dat.hash); + + bat_priv->dat.hash = NULL; +} + +/** + * batadv_dat_init() - initialise the DAT internals + * @bat_priv: the bat priv with all the soft interface information + * + * Return: 0 in case of success, a negative error code otherwise + */ +int batadv_dat_init(struct batadv_priv *bat_priv) +{ + if (bat_priv->dat.hash) + return 0; + + bat_priv->dat.hash = batadv_hash_new(1024); + + if (!bat_priv->dat.hash) + return -ENOMEM; + + INIT_DELAYED_WORK(&bat_priv->dat.work, batadv_dat_purge); + batadv_dat_start_timer(bat_priv); + + batadv_tvlv_handler_register(bat_priv, batadv_dat_tvlv_ogm_handler_v1, + NULL, BATADV_TVLV_DAT, 1, + BATADV_TVLV_HANDLER_OGM_CIFNOTFND); + batadv_dat_tvlv_container_update(bat_priv); + return 0; +} + +/** + * batadv_dat_free() - free the DAT internals + * @bat_priv: the bat priv with all the soft interface information + */ +void batadv_dat_free(struct batadv_priv *bat_priv) +{ + batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_DAT, 1); + batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_DAT, 1); + + cancel_delayed_work_sync(&bat_priv->dat.work); + + batadv_dat_hash_free(bat_priv); +} + +/** + * batadv_dat_cache_dump_entry() - dump one entry of the DAT cache table to a + * netlink socket + * @msg: buffer for the message + * @portid: netlink port + * @cb: Control block containing additional options + * @dat_entry: entry to dump + * + * Return: 0 or error code. + */ +static int +batadv_dat_cache_dump_entry(struct sk_buff *msg, u32 portid, + struct netlink_callback *cb, + struct batadv_dat_entry *dat_entry) +{ + int msecs; + void *hdr; + + hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq, + &batadv_netlink_family, NLM_F_MULTI, + BATADV_CMD_GET_DAT_CACHE); + if (!hdr) + return -ENOBUFS; + + genl_dump_check_consistent(cb, hdr); + + msecs = jiffies_to_msecs(jiffies - dat_entry->last_update); + + if (nla_put_in_addr(msg, BATADV_ATTR_DAT_CACHE_IP4ADDRESS, + dat_entry->ip) || + nla_put(msg, BATADV_ATTR_DAT_CACHE_HWADDRESS, ETH_ALEN, + dat_entry->mac_addr) || + nla_put_u16(msg, BATADV_ATTR_DAT_CACHE_VID, dat_entry->vid) || + nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, msecs)) { + genlmsg_cancel(msg, hdr); + return -EMSGSIZE; + } + + genlmsg_end(msg, hdr); + return 0; +} + +/** + * batadv_dat_cache_dump_bucket() - dump one bucket of the DAT cache table to + * a netlink socket + * @msg: buffer for the message + * @portid: netlink port + * @cb: Control block containing additional options + * @hash: hash to dump + * @bucket: bucket index to dump + * @idx_skip: How many entries to skip + * + * Return: 0 or error code. + */ +static int +batadv_dat_cache_dump_bucket(struct sk_buff *msg, u32 portid, + struct netlink_callback *cb, + struct batadv_hashtable *hash, unsigned int bucket, + int *idx_skip) +{ + struct batadv_dat_entry *dat_entry; + int idx = 0; + + spin_lock_bh(&hash->list_locks[bucket]); + cb->seq = atomic_read(&hash->generation) << 1 | 1; + + hlist_for_each_entry(dat_entry, &hash->table[bucket], hash_entry) { + if (idx < *idx_skip) + goto skip; + + if (batadv_dat_cache_dump_entry(msg, portid, cb, dat_entry)) { + spin_unlock_bh(&hash->list_locks[bucket]); + *idx_skip = idx; + + return -EMSGSIZE; + } + +skip: + idx++; + } + spin_unlock_bh(&hash->list_locks[bucket]); + + return 0; +} + +/** + * batadv_dat_cache_dump() - dump DAT cache table to a netlink socket + * @msg: buffer for the message + * @cb: callback structure containing arguments + * + * Return: message length. + */ +int batadv_dat_cache_dump(struct sk_buff *msg, struct netlink_callback *cb) +{ + struct batadv_hard_iface *primary_if = NULL; + int portid = NETLINK_CB(cb->skb).portid; + struct net *net = sock_net(cb->skb->sk); + struct net_device *soft_iface; + struct batadv_hashtable *hash; + struct batadv_priv *bat_priv; + int bucket = cb->args[0]; + int idx = cb->args[1]; + int ifindex; + int ret = 0; + + ifindex = batadv_netlink_get_ifindex(cb->nlh, + BATADV_ATTR_MESH_IFINDEX); + if (!ifindex) + return -EINVAL; + + soft_iface = dev_get_by_index(net, ifindex); + if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { + ret = -ENODEV; + goto out; + } + + bat_priv = netdev_priv(soft_iface); + hash = bat_priv->dat.hash; + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { + ret = -ENOENT; + goto out; + } + + while (bucket < hash->size) { + if (batadv_dat_cache_dump_bucket(msg, portid, cb, hash, bucket, + &idx)) + break; + + bucket++; + idx = 0; + } + + cb->args[0] = bucket; + cb->args[1] = idx; + + ret = msg->len; + +out: + batadv_hardif_put(primary_if); + + dev_put(soft_iface); + + return ret; +} + +/** + * batadv_arp_get_type() - parse an ARP packet and gets the type + * @bat_priv: the bat priv with all the soft interface information + * @skb: packet to analyse + * @hdr_size: size of the possible header before the ARP packet in the skb + * + * Return: the ARP type if the skb contains a valid ARP packet, 0 otherwise. + */ +static u16 batadv_arp_get_type(struct batadv_priv *bat_priv, + struct sk_buff *skb, int hdr_size) +{ + struct arphdr *arphdr; + struct ethhdr *ethhdr; + __be32 ip_src, ip_dst; + u8 *hw_src, *hw_dst; + u16 type = 0; + + /* pull the ethernet header */ + if (unlikely(!pskb_may_pull(skb, hdr_size + ETH_HLEN))) + goto out; + + ethhdr = (struct ethhdr *)(skb->data + hdr_size); + + if (ethhdr->h_proto != htons(ETH_P_ARP)) + goto out; + + /* pull the ARP payload */ + if (unlikely(!pskb_may_pull(skb, hdr_size + ETH_HLEN + + arp_hdr_len(skb->dev)))) + goto out; + + arphdr = (struct arphdr *)(skb->data + hdr_size + ETH_HLEN); + + /* check whether the ARP packet carries a valid IP information */ + if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) + goto out; + + if (arphdr->ar_pro != htons(ETH_P_IP)) + goto out; + + if (arphdr->ar_hln != ETH_ALEN) + goto out; + + if (arphdr->ar_pln != 4) + goto out; + + /* Check for bad reply/request. If the ARP message is not sane, DAT + * will simply ignore it + */ + ip_src = batadv_arp_ip_src(skb, hdr_size); + ip_dst = batadv_arp_ip_dst(skb, hdr_size); + if (ipv4_is_loopback(ip_src) || ipv4_is_multicast(ip_src) || + ipv4_is_loopback(ip_dst) || ipv4_is_multicast(ip_dst) || + ipv4_is_zeronet(ip_src) || ipv4_is_lbcast(ip_src) || + ipv4_is_zeronet(ip_dst) || ipv4_is_lbcast(ip_dst)) + goto out; + + hw_src = batadv_arp_hw_src(skb, hdr_size); + if (is_zero_ether_addr(hw_src) || is_multicast_ether_addr(hw_src)) + goto out; + + /* don't care about the destination MAC address in ARP requests */ + if (arphdr->ar_op != htons(ARPOP_REQUEST)) { + hw_dst = batadv_arp_hw_dst(skb, hdr_size); + if (is_zero_ether_addr(hw_dst) || + is_multicast_ether_addr(hw_dst)) + goto out; + } + + type = ntohs(arphdr->ar_op); +out: + return type; +} + +/** + * batadv_dat_get_vid() - extract the VLAN identifier from skb if any + * @skb: the buffer containing the packet to extract the VID from + * @hdr_size: the size of the batman-adv header encapsulating the packet + * + * Return: If the packet embedded in the skb is vlan tagged this function + * returns the VID with the BATADV_VLAN_HAS_TAG flag. Otherwise BATADV_NO_FLAGS + * is returned. + */ +static unsigned short batadv_dat_get_vid(struct sk_buff *skb, int *hdr_size) +{ + unsigned short vid; + + vid = batadv_get_vid(skb, *hdr_size); + + /* ARP parsing functions jump forward of hdr_size + ETH_HLEN. + * If the header contained in the packet is a VLAN one (which is longer) + * hdr_size is updated so that the functions will still skip the + * correct amount of bytes. + */ + if (vid & BATADV_VLAN_HAS_TAG) + *hdr_size += VLAN_HLEN; + + return vid; +} + +/** + * batadv_dat_arp_create_reply() - create an ARP Reply + * @bat_priv: the bat priv with all the soft interface information + * @ip_src: ARP sender IP + * @ip_dst: ARP target IP + * @hw_src: Ethernet source and ARP sender MAC + * @hw_dst: Ethernet destination and ARP target MAC + * @vid: VLAN identifier (optional, set to zero otherwise) + * + * Creates an ARP Reply from the given values, optionally encapsulated in a + * VLAN header. + * + * Return: An skb containing an ARP Reply. + */ +static struct sk_buff * +batadv_dat_arp_create_reply(struct batadv_priv *bat_priv, __be32 ip_src, + __be32 ip_dst, u8 *hw_src, u8 *hw_dst, + unsigned short vid) +{ + struct sk_buff *skb; + + skb = arp_create(ARPOP_REPLY, ETH_P_ARP, ip_dst, bat_priv->soft_iface, + ip_src, hw_dst, hw_src, hw_dst); + if (!skb) + return NULL; + + skb_reset_mac_header(skb); + + if (vid & BATADV_VLAN_HAS_TAG) + skb = vlan_insert_tag(skb, htons(ETH_P_8021Q), + vid & VLAN_VID_MASK); + + return skb; +} + +/** + * batadv_dat_snoop_outgoing_arp_request() - snoop the ARP request and try to + * answer using DAT + * @bat_priv: the bat priv with all the soft interface information + * @skb: packet to check + * + * Return: true if the message has been sent to the dht candidates, false + * otherwise. In case of a positive return value the message has to be enqueued + * to permit the fallback. + */ +bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv, + struct sk_buff *skb) +{ + u16 type = 0; + __be32 ip_dst, ip_src; + u8 *hw_src; + bool ret = false; + struct batadv_dat_entry *dat_entry = NULL; + struct sk_buff *skb_new; + struct net_device *soft_iface = bat_priv->soft_iface; + int hdr_size = 0; + unsigned short vid; + + if (!atomic_read(&bat_priv->distributed_arp_table)) + goto out; + + vid = batadv_dat_get_vid(skb, &hdr_size); + + type = batadv_arp_get_type(bat_priv, skb, hdr_size); + /* If the node gets an ARP_REQUEST it has to send a DHT_GET unicast + * message to the selected DHT candidates + */ + if (type != ARPOP_REQUEST) + goto out; + + batadv_dbg_arp(bat_priv, skb, hdr_size, "Parsing outgoing ARP REQUEST"); + + ip_src = batadv_arp_ip_src(skb, hdr_size); + hw_src = batadv_arp_hw_src(skb, hdr_size); + ip_dst = batadv_arp_ip_dst(skb, hdr_size); + + batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid); + + dat_entry = batadv_dat_entry_hash_find(bat_priv, ip_dst, vid); + if (dat_entry) { + /* If the ARP request is destined for a local client the local + * client will answer itself. DAT would only generate a + * duplicate packet. + * + * Moreover, if the soft-interface is enslaved into a bridge, an + * additional DAT answer may trigger kernel warnings about + * a packet coming from the wrong port. + */ + if (batadv_is_my_client(bat_priv, dat_entry->mac_addr, vid)) { + ret = true; + goto out; + } + + /* If BLA is enabled, only send ARP replies if we have claimed + * the destination for the ARP request or if no one else of + * the backbone gws belonging to our backbone has claimed the + * destination. + */ + if (!batadv_bla_check_claim(bat_priv, + dat_entry->mac_addr, vid)) { + batadv_dbg(BATADV_DBG_DAT, bat_priv, + "Device %pM claimed by another backbone gw. Don't send ARP reply!", + dat_entry->mac_addr); + ret = true; + goto out; + } + + skb_new = batadv_dat_arp_create_reply(bat_priv, ip_dst, ip_src, + dat_entry->mac_addr, + hw_src, vid); + if (!skb_new) + goto out; + + skb_new->protocol = eth_type_trans(skb_new, soft_iface); + + batadv_inc_counter(bat_priv, BATADV_CNT_RX); + batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, + skb->len + ETH_HLEN + hdr_size); + + netif_rx(skb_new); + batadv_dbg(BATADV_DBG_DAT, bat_priv, "ARP request replied locally\n"); + ret = true; + } else { + /* Send the request to the DHT */ + ret = batadv_dat_forward_data(bat_priv, skb, ip_dst, vid, + BATADV_P_DAT_DHT_GET); + } +out: + batadv_dat_entry_put(dat_entry); + return ret; +} + +/** + * batadv_dat_snoop_incoming_arp_request() - snoop the ARP request and try to + * answer using the local DAT storage + * @bat_priv: the bat priv with all the soft interface information + * @skb: packet to check + * @hdr_size: size of the encapsulation header + * + * Return: true if the request has been answered, false otherwise. + */ +bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv, + struct sk_buff *skb, int hdr_size) +{ + u16 type; + __be32 ip_src, ip_dst; + u8 *hw_src; + struct sk_buff *skb_new; + struct batadv_dat_entry *dat_entry = NULL; + bool ret = false; + unsigned short vid; + int err; + + if (!atomic_read(&bat_priv->distributed_arp_table)) + goto out; + + vid = batadv_dat_get_vid(skb, &hdr_size); + + type = batadv_arp_get_type(bat_priv, skb, hdr_size); + if (type != ARPOP_REQUEST) + goto out; + + hw_src = batadv_arp_hw_src(skb, hdr_size); + ip_src = batadv_arp_ip_src(skb, hdr_size); + ip_dst = batadv_arp_ip_dst(skb, hdr_size); + + batadv_dbg_arp(bat_priv, skb, hdr_size, "Parsing incoming ARP REQUEST"); + + batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid); + + dat_entry = batadv_dat_entry_hash_find(bat_priv, ip_dst, vid); + if (!dat_entry) + goto out; + + skb_new = batadv_dat_arp_create_reply(bat_priv, ip_dst, ip_src, + dat_entry->mac_addr, hw_src, vid); + if (!skb_new) + goto out; + + /* To preserve backwards compatibility, the node has choose the outgoing + * format based on the incoming request packet type. The assumption is + * that a node not using the 4addr packet format doesn't support it. + */ + if (hdr_size == sizeof(struct batadv_unicast_4addr_packet)) + err = batadv_send_skb_via_tt_4addr(bat_priv, skb_new, + BATADV_P_DAT_CACHE_REPLY, + NULL, vid); + else + err = batadv_send_skb_via_tt(bat_priv, skb_new, NULL, vid); + + if (err != NET_XMIT_DROP) { + batadv_inc_counter(bat_priv, BATADV_CNT_DAT_CACHED_REPLY_TX); + ret = true; + } +out: + batadv_dat_entry_put(dat_entry); + if (ret) + kfree_skb(skb); + return ret; +} + +/** + * batadv_dat_snoop_outgoing_arp_reply() - snoop the ARP reply and fill the DHT + * @bat_priv: the bat priv with all the soft interface information + * @skb: packet to check + */ +void batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv, + struct sk_buff *skb) +{ + u16 type; + __be32 ip_src, ip_dst; + u8 *hw_src, *hw_dst; + int hdr_size = 0; + unsigned short vid; + + if (!atomic_read(&bat_priv->distributed_arp_table)) + return; + + vid = batadv_dat_get_vid(skb, &hdr_size); + + type = batadv_arp_get_type(bat_priv, skb, hdr_size); + if (type != ARPOP_REPLY) + return; + + batadv_dbg_arp(bat_priv, skb, hdr_size, "Parsing outgoing ARP REPLY"); + + hw_src = batadv_arp_hw_src(skb, hdr_size); + ip_src = batadv_arp_ip_src(skb, hdr_size); + hw_dst = batadv_arp_hw_dst(skb, hdr_size); + ip_dst = batadv_arp_ip_dst(skb, hdr_size); + + batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid); + batadv_dat_entry_add(bat_priv, ip_dst, hw_dst, vid); + + /* Send the ARP reply to the candidates for both the IP addresses that + * the node obtained from the ARP reply + */ + batadv_dat_forward_data(bat_priv, skb, ip_src, vid, + BATADV_P_DAT_DHT_PUT); + batadv_dat_forward_data(bat_priv, skb, ip_dst, vid, + BATADV_P_DAT_DHT_PUT); +} + +/** + * batadv_dat_snoop_incoming_arp_reply() - snoop the ARP reply and fill the + * local DAT storage only + * @bat_priv: the bat priv with all the soft interface information + * @skb: packet to check + * @hdr_size: size of the encapsulation header + * + * Return: true if the packet was snooped and consumed by DAT. False if the + * packet has to be delivered to the interface + */ +bool batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv, + struct sk_buff *skb, int hdr_size) +{ + struct batadv_dat_entry *dat_entry = NULL; + u16 type; + __be32 ip_src, ip_dst; + u8 *hw_src, *hw_dst; + bool dropped = false; + unsigned short vid; + + if (!atomic_read(&bat_priv->distributed_arp_table)) + goto out; + + vid = batadv_dat_get_vid(skb, &hdr_size); + + type = batadv_arp_get_type(bat_priv, skb, hdr_size); + if (type != ARPOP_REPLY) + goto out; + + batadv_dbg_arp(bat_priv, skb, hdr_size, "Parsing incoming ARP REPLY"); + + hw_src = batadv_arp_hw_src(skb, hdr_size); + ip_src = batadv_arp_ip_src(skb, hdr_size); + hw_dst = batadv_arp_hw_dst(skb, hdr_size); + ip_dst = batadv_arp_ip_dst(skb, hdr_size); + + /* If ip_dst is already in cache and has the right mac address, + * drop this frame if this ARP reply is destined for us because it's + * most probably an ARP reply generated by another node of the DHT. + * We have most probably received already a reply earlier. Delivering + * this frame would lead to doubled receive of an ARP reply. + */ + dat_entry = batadv_dat_entry_hash_find(bat_priv, ip_src, vid); + if (dat_entry && batadv_compare_eth(hw_src, dat_entry->mac_addr)) { + batadv_dbg(BATADV_DBG_DAT, bat_priv, "Doubled ARP reply removed: ARP MSG = [src: %pM-%pI4 dst: %pM-%pI4]; dat_entry: %pM-%pI4\n", + hw_src, &ip_src, hw_dst, &ip_dst, + dat_entry->mac_addr, &dat_entry->ip); + dropped = true; + } + + /* Update our internal cache with both the IP addresses the node got + * within the ARP reply + */ + batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid); + batadv_dat_entry_add(bat_priv, ip_dst, hw_dst, vid); + + if (dropped) + goto out; + + /* If BLA is enabled, only forward ARP replies if we have claimed the + * source of the ARP reply or if no one else of the same backbone has + * already claimed that client. This prevents that different gateways + * to the same backbone all forward the ARP reply leading to multiple + * replies in the backbone. + */ + if (!batadv_bla_check_claim(bat_priv, hw_src, vid)) { + batadv_dbg(BATADV_DBG_DAT, bat_priv, + "Device %pM claimed by another backbone gw. Drop ARP reply.\n", + hw_src); + dropped = true; + goto out; + } + + /* if this REPLY is directed to a client of mine, let's deliver the + * packet to the interface + */ + dropped = !batadv_is_my_client(bat_priv, hw_dst, vid); + + /* if this REPLY is sent on behalf of a client of mine, let's drop the + * packet because the client will reply by itself + */ + dropped |= batadv_is_my_client(bat_priv, hw_src, vid); +out: + if (dropped) + kfree_skb(skb); + batadv_dat_entry_put(dat_entry); + /* if dropped == false -> deliver to the interface */ + return dropped; +} + +/** + * batadv_dat_check_dhcp_ipudp() - check skb for IP+UDP headers valid for DHCP + * @skb: the packet to check + * @ip_src: a buffer to store the IPv4 source address in + * + * Checks whether the given skb has an IP and UDP header valid for a DHCP + * message from a DHCP server. And if so, stores the IPv4 source address in + * the provided buffer. + * + * Return: True if valid, false otherwise. + */ +static bool +batadv_dat_check_dhcp_ipudp(struct sk_buff *skb, __be32 *ip_src) +{ + unsigned int offset = skb_network_offset(skb); + struct udphdr *udphdr, _udphdr; + struct iphdr *iphdr, _iphdr; + + iphdr = skb_header_pointer(skb, offset, sizeof(_iphdr), &_iphdr); + if (!iphdr || iphdr->version != 4 || iphdr->ihl * 4 < sizeof(_iphdr)) + return false; + + if (iphdr->protocol != IPPROTO_UDP) + return false; + + offset += iphdr->ihl * 4; + skb_set_transport_header(skb, offset); + + udphdr = skb_header_pointer(skb, offset, sizeof(_udphdr), &_udphdr); + if (!udphdr || udphdr->source != htons(67)) + return false; + + *ip_src = get_unaligned(&iphdr->saddr); + + return true; +} + +/** + * batadv_dat_check_dhcp() - examine packet for valid DHCP message + * @skb: the packet to check + * @proto: ethernet protocol hint (behind a potential vlan) + * @ip_src: a buffer to store the IPv4 source address in + * + * Checks whether the given skb is a valid DHCP packet. And if so, stores the + * IPv4 source address in the provided buffer. + * + * Caller needs to ensure that the skb network header is set correctly. + * + * Return: If skb is a valid DHCP packet, then returns its op code + * (e.g. BOOTREPLY vs. BOOTREQUEST). Otherwise returns -EINVAL. + */ +static int +batadv_dat_check_dhcp(struct sk_buff *skb, __be16 proto, __be32 *ip_src) +{ + __be32 *magic, _magic; + unsigned int offset; + struct { + __u8 op; + __u8 htype; + __u8 hlen; + __u8 hops; + } *dhcp_h, _dhcp_h; + + if (proto != htons(ETH_P_IP)) + return -EINVAL; + + if (!batadv_dat_check_dhcp_ipudp(skb, ip_src)) + return -EINVAL; + + offset = skb_transport_offset(skb) + sizeof(struct udphdr); + if (skb->len < offset + sizeof(struct batadv_dhcp_packet)) + return -EINVAL; + + dhcp_h = skb_header_pointer(skb, offset, sizeof(_dhcp_h), &_dhcp_h); + if (!dhcp_h || dhcp_h->htype != BATADV_HTYPE_ETHERNET || + dhcp_h->hlen != ETH_ALEN) + return -EINVAL; + + offset += offsetof(struct batadv_dhcp_packet, magic); + + magic = skb_header_pointer(skb, offset, sizeof(_magic), &_magic); + if (!magic || get_unaligned(magic) != htonl(BATADV_DHCP_MAGIC)) + return -EINVAL; + + return dhcp_h->op; +} + +/** + * batadv_dat_get_dhcp_message_type() - get message type of a DHCP packet + * @skb: the DHCP packet to parse + * + * Iterates over the DHCP options of the given DHCP packet to find a + * DHCP Message Type option and parse it. + * + * Caller needs to ensure that the given skb is a valid DHCP packet and + * that the skb transport header is set correctly. + * + * Return: The found DHCP message type value, if found. -EINVAL otherwise. + */ +static int batadv_dat_get_dhcp_message_type(struct sk_buff *skb) +{ + unsigned int offset = skb_transport_offset(skb) + sizeof(struct udphdr); + u8 *type, _type; + struct { + u8 type; + u8 len; + } *tl, _tl; + + offset += sizeof(struct batadv_dhcp_packet); + + while ((tl = skb_header_pointer(skb, offset, sizeof(_tl), &_tl))) { + if (tl->type == BATADV_DHCP_OPT_MSG_TYPE) + break; + + if (tl->type == BATADV_DHCP_OPT_END) + break; + + if (tl->type == BATADV_DHCP_OPT_PAD) + offset++; + else + offset += tl->len + sizeof(_tl); + } + + /* Option Overload Code not supported */ + if (!tl || tl->type != BATADV_DHCP_OPT_MSG_TYPE || + tl->len != sizeof(_type)) + return -EINVAL; + + offset += sizeof(_tl); + + type = skb_header_pointer(skb, offset, sizeof(_type), &_type); + if (!type) + return -EINVAL; + + return *type; +} + +/** + * batadv_dat_dhcp_get_yiaddr() - get yiaddr from a DHCP packet + * @skb: the DHCP packet to parse + * @buf: a buffer to store the yiaddr in + * + * Caller needs to ensure that the given skb is a valid DHCP packet and + * that the skb transport header is set correctly. + * + * Return: True on success, false otherwise. + */ +static bool batadv_dat_dhcp_get_yiaddr(struct sk_buff *skb, __be32 *buf) +{ + unsigned int offset = skb_transport_offset(skb) + sizeof(struct udphdr); + __be32 *yiaddr; + + offset += offsetof(struct batadv_dhcp_packet, yiaddr); + yiaddr = skb_header_pointer(skb, offset, BATADV_DHCP_YIADDR_LEN, buf); + + if (!yiaddr) + return false; + + if (yiaddr != buf) + *buf = get_unaligned(yiaddr); + + return true; +} + +/** + * batadv_dat_get_dhcp_chaddr() - get chaddr from a DHCP packet + * @skb: the DHCP packet to parse + * @buf: a buffer to store the chaddr in + * + * Caller needs to ensure that the given skb is a valid DHCP packet and + * that the skb transport header is set correctly. + * + * Return: True on success, false otherwise + */ +static bool batadv_dat_get_dhcp_chaddr(struct sk_buff *skb, u8 *buf) +{ + unsigned int offset = skb_transport_offset(skb) + sizeof(struct udphdr); + u8 *chaddr; + + offset += offsetof(struct batadv_dhcp_packet, chaddr); + chaddr = skb_header_pointer(skb, offset, BATADV_DHCP_CHADDR_LEN, buf); + + if (!chaddr) + return false; + + if (chaddr != buf) + memcpy(buf, chaddr, BATADV_DHCP_CHADDR_LEN); + + return true; +} + +/** + * batadv_dat_put_dhcp() - puts addresses from a DHCP packet into the DHT and + * DAT cache + * @bat_priv: the bat priv with all the soft interface information + * @chaddr: the DHCP client MAC address + * @yiaddr: the DHCP client IP address + * @hw_dst: the DHCP server MAC address + * @ip_dst: the DHCP server IP address + * @vid: VLAN identifier + * + * Adds given MAC/IP pairs to the local DAT cache and propagates them further + * into the DHT. + * + * For the DHT propagation, client MAC + IP will appear as the ARP Reply + * transmitter (and hw_dst/ip_dst as the target). + */ +static void batadv_dat_put_dhcp(struct batadv_priv *bat_priv, u8 *chaddr, + __be32 yiaddr, u8 *hw_dst, __be32 ip_dst, + unsigned short vid) +{ + struct sk_buff *skb; + + skb = batadv_dat_arp_create_reply(bat_priv, yiaddr, ip_dst, chaddr, + hw_dst, vid); + if (!skb) + return; + + skb_set_network_header(skb, ETH_HLEN); + + batadv_dat_entry_add(bat_priv, yiaddr, chaddr, vid); + batadv_dat_entry_add(bat_priv, ip_dst, hw_dst, vid); + + batadv_dat_forward_data(bat_priv, skb, yiaddr, vid, + BATADV_P_DAT_DHT_PUT); + batadv_dat_forward_data(bat_priv, skb, ip_dst, vid, + BATADV_P_DAT_DHT_PUT); + + consume_skb(skb); + + batadv_dbg(BATADV_DBG_DAT, bat_priv, + "Snooped from outgoing DHCPACK (server address): %pI4, %pM (vid: %i)\n", + &ip_dst, hw_dst, batadv_print_vid(vid)); + batadv_dbg(BATADV_DBG_DAT, bat_priv, + "Snooped from outgoing DHCPACK (client address): %pI4, %pM (vid: %i)\n", + &yiaddr, chaddr, batadv_print_vid(vid)); +} + +/** + * batadv_dat_check_dhcp_ack() - examine packet for valid DHCP message + * @skb: the packet to check + * @proto: ethernet protocol hint (behind a potential vlan) + * @ip_src: a buffer to store the IPv4 source address in + * @chaddr: a buffer to store the DHCP Client Hardware Address in + * @yiaddr: a buffer to store the DHCP Your IP Address in + * + * Checks whether the given skb is a valid DHCPACK. And if so, stores the + * IPv4 server source address (ip_src), client MAC address (chaddr) and client + * IPv4 address (yiaddr) in the provided buffers. + * + * Caller needs to ensure that the skb network header is set correctly. + * + * Return: True if the skb is a valid DHCPACK. False otherwise. + */ +static bool +batadv_dat_check_dhcp_ack(struct sk_buff *skb, __be16 proto, __be32 *ip_src, + u8 *chaddr, __be32 *yiaddr) +{ + int type; + + type = batadv_dat_check_dhcp(skb, proto, ip_src); + if (type != BATADV_BOOTREPLY) + return false; + + type = batadv_dat_get_dhcp_message_type(skb); + if (type != BATADV_DHCPACK) + return false; + + if (!batadv_dat_dhcp_get_yiaddr(skb, yiaddr)) + return false; + + if (!batadv_dat_get_dhcp_chaddr(skb, chaddr)) + return false; + + return true; +} + +/** + * batadv_dat_snoop_outgoing_dhcp_ack() - snoop DHCPACK and fill DAT with it + * @bat_priv: the bat priv with all the soft interface information + * @skb: the packet to snoop + * @proto: ethernet protocol hint (behind a potential vlan) + * @vid: VLAN identifier + * + * This function first checks whether the given skb is a valid DHCPACK. If + * so then its source MAC and IP as well as its DHCP Client Hardware Address + * field and DHCP Your IP Address field are added to the local DAT cache and + * propagated into the DHT. + * + * Caller needs to ensure that the skb mac and network headers are set + * correctly. + */ +void batadv_dat_snoop_outgoing_dhcp_ack(struct batadv_priv *bat_priv, + struct sk_buff *skb, + __be16 proto, + unsigned short vid) +{ + u8 chaddr[BATADV_DHCP_CHADDR_LEN]; + __be32 ip_src, yiaddr; + + if (!atomic_read(&bat_priv->distributed_arp_table)) + return; + + if (!batadv_dat_check_dhcp_ack(skb, proto, &ip_src, chaddr, &yiaddr)) + return; + + batadv_dat_put_dhcp(bat_priv, chaddr, yiaddr, eth_hdr(skb)->h_source, + ip_src, vid); +} + +/** + * batadv_dat_snoop_incoming_dhcp_ack() - snoop DHCPACK and fill DAT cache + * @bat_priv: the bat priv with all the soft interface information + * @skb: the packet to snoop + * @hdr_size: header size, up to the tail of the batman-adv header + * + * This function first checks whether the given skb is a valid DHCPACK. If + * so then its source MAC and IP as well as its DHCP Client Hardware Address + * field and DHCP Your IP Address field are added to the local DAT cache. + */ +void batadv_dat_snoop_incoming_dhcp_ack(struct batadv_priv *bat_priv, + struct sk_buff *skb, int hdr_size) +{ + u8 chaddr[BATADV_DHCP_CHADDR_LEN]; + struct ethhdr *ethhdr; + __be32 ip_src, yiaddr; + unsigned short vid; + __be16 proto; + u8 *hw_src; + + if (!atomic_read(&bat_priv->distributed_arp_table)) + return; + + if (unlikely(!pskb_may_pull(skb, hdr_size + ETH_HLEN))) + return; + + ethhdr = (struct ethhdr *)(skb->data + hdr_size); + skb_set_network_header(skb, hdr_size + ETH_HLEN); + proto = ethhdr->h_proto; + + if (!batadv_dat_check_dhcp_ack(skb, proto, &ip_src, chaddr, &yiaddr)) + return; + + hw_src = ethhdr->h_source; + vid = batadv_dat_get_vid(skb, &hdr_size); + + batadv_dat_entry_add(bat_priv, yiaddr, chaddr, vid); + batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid); + + batadv_dbg(BATADV_DBG_DAT, bat_priv, + "Snooped from incoming DHCPACK (server address): %pI4, %pM (vid: %i)\n", + &ip_src, hw_src, batadv_print_vid(vid)); + batadv_dbg(BATADV_DBG_DAT, bat_priv, + "Snooped from incoming DHCPACK (client address): %pI4, %pM (vid: %i)\n", + &yiaddr, chaddr, batadv_print_vid(vid)); +} + +/** + * batadv_dat_drop_broadcast_packet() - check if an ARP request has to be + * dropped (because the node has already obtained the reply via DAT) or not + * @bat_priv: the bat priv with all the soft interface information + * @forw_packet: the broadcast packet + * + * Return: true if the node can drop the packet, false otherwise. + */ +bool batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv, + struct batadv_forw_packet *forw_packet) +{ + u16 type; + __be32 ip_dst; + struct batadv_dat_entry *dat_entry = NULL; + bool ret = false; + int hdr_size = sizeof(struct batadv_bcast_packet); + unsigned short vid; + + if (!atomic_read(&bat_priv->distributed_arp_table)) + goto out; + + /* If this packet is an ARP_REQUEST and the node already has the + * information that it is going to ask, then the packet can be dropped + */ + if (batadv_forw_packet_is_rebroadcast(forw_packet)) + goto out; + + vid = batadv_dat_get_vid(forw_packet->skb, &hdr_size); + + type = batadv_arp_get_type(bat_priv, forw_packet->skb, hdr_size); + if (type != ARPOP_REQUEST) + goto out; + + ip_dst = batadv_arp_ip_dst(forw_packet->skb, hdr_size); + dat_entry = batadv_dat_entry_hash_find(bat_priv, ip_dst, vid); + /* check if the node already got this entry */ + if (!dat_entry) { + batadv_dbg(BATADV_DBG_DAT, bat_priv, + "ARP Request for %pI4: fallback\n", &ip_dst); + goto out; + } + + batadv_dbg(BATADV_DBG_DAT, bat_priv, + "ARP Request for %pI4: fallback prevented\n", &ip_dst); + ret = true; + +out: + batadv_dat_entry_put(dat_entry); + return ret; +} diff --git a/net/batman-adv/distributed-arp-table.h b/net/batman-adv/distributed-arp-table.h new file mode 100644 index 000000000..bed7f3d20 --- /dev/null +++ b/net/batman-adv/distributed-arp-table.h @@ -0,0 +1,186 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Antonio Quartulli + */ + +#ifndef _NET_BATMAN_ADV_DISTRIBUTED_ARP_TABLE_H_ +#define _NET_BATMAN_ADV_DISTRIBUTED_ARP_TABLE_H_ + +#include "main.h" + +#include <linux/compiler.h> +#include <linux/netdevice.h> +#include <linux/netlink.h> +#include <linux/skbuff.h> +#include <linux/types.h> +#include <uapi/linux/batadv_packet.h> + +#include "originator.h" + +#ifdef CONFIG_BATMAN_ADV_DAT + +/* BATADV_DAT_ADDR_MAX - maximum address value in the DHT space */ +#define BATADV_DAT_ADDR_MAX ((batadv_dat_addr_t)~(batadv_dat_addr_t)0) + +void batadv_dat_status_update(struct net_device *net_dev); +bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv, + struct sk_buff *skb); +bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv, + struct sk_buff *skb, int hdr_size); +void batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv, + struct sk_buff *skb); +bool batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv, + struct sk_buff *skb, int hdr_size); +void batadv_dat_snoop_outgoing_dhcp_ack(struct batadv_priv *bat_priv, + struct sk_buff *skb, + __be16 proto, + unsigned short vid); +void batadv_dat_snoop_incoming_dhcp_ack(struct batadv_priv *bat_priv, + struct sk_buff *skb, int hdr_size); +bool batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv, + struct batadv_forw_packet *forw_packet); + +/** + * batadv_dat_init_orig_node_addr() - assign a DAT address to the orig_node + * @orig_node: the node to assign the DAT address to + */ +static inline void +batadv_dat_init_orig_node_addr(struct batadv_orig_node *orig_node) +{ + u32 addr; + + addr = batadv_choose_orig(orig_node->orig, BATADV_DAT_ADDR_MAX); + orig_node->dat_addr = (batadv_dat_addr_t)addr; +} + +/** + * batadv_dat_init_own_addr() - assign a DAT address to the node itself + * @bat_priv: the bat priv with all the soft interface information + * @primary_if: a pointer to the primary interface + */ +static inline void +batadv_dat_init_own_addr(struct batadv_priv *bat_priv, + struct batadv_hard_iface *primary_if) +{ + u32 addr; + + addr = batadv_choose_orig(primary_if->net_dev->dev_addr, + BATADV_DAT_ADDR_MAX); + + bat_priv->dat.addr = (batadv_dat_addr_t)addr; +} + +int batadv_dat_init(struct batadv_priv *bat_priv); +void batadv_dat_free(struct batadv_priv *bat_priv); +int batadv_dat_cache_dump(struct sk_buff *msg, struct netlink_callback *cb); + +/** + * batadv_dat_inc_counter() - increment the correct DAT packet counter + * @bat_priv: the bat priv with all the soft interface information + * @subtype: the 4addr subtype of the packet to be counted + * + * Updates the ethtool statistics for the received packet if it is a DAT subtype + */ +static inline void batadv_dat_inc_counter(struct batadv_priv *bat_priv, + u8 subtype) +{ + switch (subtype) { + case BATADV_P_DAT_DHT_GET: + batadv_inc_counter(bat_priv, + BATADV_CNT_DAT_GET_RX); + break; + case BATADV_P_DAT_DHT_PUT: + batadv_inc_counter(bat_priv, + BATADV_CNT_DAT_PUT_RX); + break; + } +} + +#else + +static inline void batadv_dat_status_update(struct net_device *net_dev) +{ +} + +static inline bool +batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv, + struct sk_buff *skb) +{ + return false; +} + +static inline bool +batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv, + struct sk_buff *skb, int hdr_size) +{ + return false; +} + +static inline bool +batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv, + struct sk_buff *skb) +{ + return false; +} + +static inline bool +batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv, + struct sk_buff *skb, int hdr_size) +{ + return false; +} + +static inline void +batadv_dat_snoop_outgoing_dhcp_ack(struct batadv_priv *bat_priv, + struct sk_buff *skb, __be16 proto, + unsigned short vid) +{ +} + +static inline void +batadv_dat_snoop_incoming_dhcp_ack(struct batadv_priv *bat_priv, + struct sk_buff *skb, int hdr_size) +{ +} + +static inline bool +batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv, + struct batadv_forw_packet *forw_packet) +{ + return false; +} + +static inline void +batadv_dat_init_orig_node_addr(struct batadv_orig_node *orig_node) +{ +} + +static inline void batadv_dat_init_own_addr(struct batadv_priv *bat_priv, + struct batadv_hard_iface *iface) +{ +} + +static inline int batadv_dat_init(struct batadv_priv *bat_priv) +{ + return 0; +} + +static inline void batadv_dat_free(struct batadv_priv *bat_priv) +{ +} + +static inline int +batadv_dat_cache_dump(struct sk_buff *msg, struct netlink_callback *cb) +{ + return -EOPNOTSUPP; +} + +static inline void batadv_dat_inc_counter(struct batadv_priv *bat_priv, + u8 subtype) +{ +} + +#endif /* CONFIG_BATMAN_ADV_DAT */ + +#endif /* _NET_BATMAN_ADV_DISTRIBUTED_ARP_TABLE_H_ */ diff --git a/net/batman-adv/fragmentation.c b/net/batman-adv/fragmentation.c new file mode 100644 index 000000000..c120c7c6d --- /dev/null +++ b/net/batman-adv/fragmentation.c @@ -0,0 +1,562 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Martin Hundebøll <martin@hundeboll.net> + */ + +#include "fragmentation.h" +#include "main.h" + +#include <linux/atomic.h> +#include <linux/byteorder/generic.h> +#include <linux/errno.h> +#include <linux/etherdevice.h> +#include <linux/gfp.h> +#include <linux/if_ether.h> +#include <linux/jiffies.h> +#include <linux/lockdep.h> +#include <linux/minmax.h> +#include <linux/netdevice.h> +#include <linux/skbuff.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/string.h> +#include <uapi/linux/batadv_packet.h> + +#include "hard-interface.h" +#include "originator.h" +#include "routing.h" +#include "send.h" + +/** + * batadv_frag_clear_chain() - delete entries in the fragment buffer chain + * @head: head of chain with entries. + * @dropped: whether the chain is cleared because all fragments are dropped + * + * Free fragments in the passed hlist. Should be called with appropriate lock. + */ +static void batadv_frag_clear_chain(struct hlist_head *head, bool dropped) +{ + struct batadv_frag_list_entry *entry; + struct hlist_node *node; + + hlist_for_each_entry_safe(entry, node, head, list) { + hlist_del(&entry->list); + + if (dropped) + kfree_skb(entry->skb); + else + consume_skb(entry->skb); + + kfree(entry); + } +} + +/** + * batadv_frag_purge_orig() - free fragments associated to an orig + * @orig_node: originator to free fragments from + * @check_cb: optional function to tell if an entry should be purged + */ +void batadv_frag_purge_orig(struct batadv_orig_node *orig_node, + bool (*check_cb)(struct batadv_frag_table_entry *)) +{ + struct batadv_frag_table_entry *chain; + u8 i; + + for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) { + chain = &orig_node->fragments[i]; + spin_lock_bh(&chain->lock); + + if (!check_cb || check_cb(chain)) { + batadv_frag_clear_chain(&chain->fragment_list, true); + chain->size = 0; + } + + spin_unlock_bh(&chain->lock); + } +} + +/** + * batadv_frag_size_limit() - maximum possible size of packet to be fragmented + * + * Return: the maximum size of payload that can be fragmented. + */ +static int batadv_frag_size_limit(void) +{ + int limit = BATADV_FRAG_MAX_FRAG_SIZE; + + limit -= sizeof(struct batadv_frag_packet); + limit *= BATADV_FRAG_MAX_FRAGMENTS; + + return limit; +} + +/** + * batadv_frag_init_chain() - check and prepare fragment chain for new fragment + * @chain: chain in fragments table to init + * @seqno: sequence number of the received fragment + * + * Make chain ready for a fragment with sequence number "seqno". Delete existing + * entries if they have an "old" sequence number. + * + * Caller must hold chain->lock. + * + * Return: true if chain is empty and the caller can just insert the new + * fragment without searching for the right position. + */ +static bool batadv_frag_init_chain(struct batadv_frag_table_entry *chain, + u16 seqno) +{ + lockdep_assert_held(&chain->lock); + + if (chain->seqno == seqno) + return false; + + if (!hlist_empty(&chain->fragment_list)) + batadv_frag_clear_chain(&chain->fragment_list, true); + + chain->size = 0; + chain->seqno = seqno; + + return true; +} + +/** + * batadv_frag_insert_packet() - insert a fragment into a fragment chain + * @orig_node: originator that the fragment was received from + * @skb: skb to insert + * @chain_out: list head to attach complete chains of fragments to + * + * Insert a new fragment into the reverse ordered chain in the right table + * entry. The hash table entry is cleared if "old" fragments exist in it. + * + * Return: true if skb is buffered, false on error. If the chain has all the + * fragments needed to merge the packet, the chain is moved to the passed head + * to avoid locking the chain in the table. + */ +static bool batadv_frag_insert_packet(struct batadv_orig_node *orig_node, + struct sk_buff *skb, + struct hlist_head *chain_out) +{ + struct batadv_frag_table_entry *chain; + struct batadv_frag_list_entry *frag_entry_new = NULL, *frag_entry_curr; + struct batadv_frag_list_entry *frag_entry_last = NULL; + struct batadv_frag_packet *frag_packet; + u8 bucket; + u16 seqno, hdr_size = sizeof(struct batadv_frag_packet); + bool ret = false; + + /* Linearize packet to avoid linearizing 16 packets in a row when doing + * the later merge. Non-linear merge should be added to remove this + * linearization. + */ + if (skb_linearize(skb) < 0) + goto err; + + frag_packet = (struct batadv_frag_packet *)skb->data; + seqno = ntohs(frag_packet->seqno); + bucket = seqno % BATADV_FRAG_BUFFER_COUNT; + + frag_entry_new = kmalloc(sizeof(*frag_entry_new), GFP_ATOMIC); + if (!frag_entry_new) + goto err; + + frag_entry_new->skb = skb; + frag_entry_new->no = frag_packet->no; + + /* Select entry in the "chain table" and delete any prior fragments + * with another sequence number. batadv_frag_init_chain() returns true, + * if the list is empty at return. + */ + chain = &orig_node->fragments[bucket]; + spin_lock_bh(&chain->lock); + if (batadv_frag_init_chain(chain, seqno)) { + hlist_add_head(&frag_entry_new->list, &chain->fragment_list); + chain->size = skb->len - hdr_size; + chain->timestamp = jiffies; + chain->total_size = ntohs(frag_packet->total_size); + ret = true; + goto out; + } + + /* Find the position for the new fragment. */ + hlist_for_each_entry(frag_entry_curr, &chain->fragment_list, list) { + /* Drop packet if fragment already exists. */ + if (frag_entry_curr->no == frag_entry_new->no) + goto err_unlock; + + /* Order fragments from highest to lowest. */ + if (frag_entry_curr->no < frag_entry_new->no) { + hlist_add_before(&frag_entry_new->list, + &frag_entry_curr->list); + chain->size += skb->len - hdr_size; + chain->timestamp = jiffies; + ret = true; + goto out; + } + + /* store current entry because it could be the last in list */ + frag_entry_last = frag_entry_curr; + } + + /* Reached the end of the list, so insert after 'frag_entry_last'. */ + if (likely(frag_entry_last)) { + hlist_add_behind(&frag_entry_new->list, &frag_entry_last->list); + chain->size += skb->len - hdr_size; + chain->timestamp = jiffies; + ret = true; + } + +out: + if (chain->size > batadv_frag_size_limit() || + chain->total_size != ntohs(frag_packet->total_size) || + chain->total_size > batadv_frag_size_limit()) { + /* Clear chain if total size of either the list or the packet + * exceeds the maximum size of one merged packet. Don't allow + * packets to have different total_size. + */ + batadv_frag_clear_chain(&chain->fragment_list, true); + chain->size = 0; + } else if (ntohs(frag_packet->total_size) == chain->size) { + /* All fragments received. Hand over chain to caller. */ + hlist_move_list(&chain->fragment_list, chain_out); + chain->size = 0; + } + +err_unlock: + spin_unlock_bh(&chain->lock); + +err: + if (!ret) { + kfree(frag_entry_new); + kfree_skb(skb); + } + + return ret; +} + +/** + * batadv_frag_merge_packets() - merge a chain of fragments + * @chain: head of chain with fragments + * + * Expand the first skb in the chain and copy the content of the remaining + * skb's into the expanded one. After doing so, clear the chain. + * + * Return: the merged skb or NULL on error. + */ +static struct sk_buff * +batadv_frag_merge_packets(struct hlist_head *chain) +{ + struct batadv_frag_packet *packet; + struct batadv_frag_list_entry *entry; + struct sk_buff *skb_out; + int size, hdr_size = sizeof(struct batadv_frag_packet); + bool dropped = false; + + /* Remove first entry, as this is the destination for the rest of the + * fragments. + */ + entry = hlist_entry(chain->first, struct batadv_frag_list_entry, list); + hlist_del(&entry->list); + skb_out = entry->skb; + kfree(entry); + + packet = (struct batadv_frag_packet *)skb_out->data; + size = ntohs(packet->total_size) + hdr_size; + + /* Make room for the rest of the fragments. */ + if (pskb_expand_head(skb_out, 0, size - skb_out->len, GFP_ATOMIC) < 0) { + kfree_skb(skb_out); + skb_out = NULL; + dropped = true; + goto free; + } + + /* Move the existing MAC header to just before the payload. (Override + * the fragment header.) + */ + skb_pull(skb_out, hdr_size); + skb_out->ip_summed = CHECKSUM_NONE; + memmove(skb_out->data - ETH_HLEN, skb_mac_header(skb_out), ETH_HLEN); + skb_set_mac_header(skb_out, -ETH_HLEN); + skb_reset_network_header(skb_out); + skb_reset_transport_header(skb_out); + + /* Copy the payload of the each fragment into the last skb */ + hlist_for_each_entry(entry, chain, list) { + size = entry->skb->len - hdr_size; + skb_put_data(skb_out, entry->skb->data + hdr_size, size); + } + +free: + /* Locking is not needed, because 'chain' is not part of any orig. */ + batadv_frag_clear_chain(chain, dropped); + return skb_out; +} + +/** + * batadv_frag_skb_buffer() - buffer fragment for later merge + * @skb: skb to buffer + * @orig_node_src: originator that the skb is received from + * + * Add fragment to buffer and merge fragments if possible. + * + * There are three possible outcomes: 1) Packet is merged: Return true and + * set *skb to merged packet; 2) Packet is buffered: Return true and set *skb + * to NULL; 3) Error: Return false and free skb. + * + * Return: true when the packet is merged or buffered, false when skb is not + * used. + */ +bool batadv_frag_skb_buffer(struct sk_buff **skb, + struct batadv_orig_node *orig_node_src) +{ + struct sk_buff *skb_out = NULL; + struct hlist_head head = HLIST_HEAD_INIT; + bool ret = false; + + /* Add packet to buffer and table entry if merge is possible. */ + if (!batadv_frag_insert_packet(orig_node_src, *skb, &head)) + goto out_err; + + /* Leave if more fragments are needed to merge. */ + if (hlist_empty(&head)) + goto out; + + skb_out = batadv_frag_merge_packets(&head); + if (!skb_out) + goto out_err; + +out: + ret = true; +out_err: + *skb = skb_out; + return ret; +} + +/** + * batadv_frag_skb_fwd() - forward fragments that would exceed MTU when merged + * @skb: skb to forward + * @recv_if: interface that the skb is received on + * @orig_node_src: originator that the skb is received from + * + * Look up the next-hop of the fragments payload and check if the merged packet + * will exceed the MTU towards the next-hop. If so, the fragment is forwarded + * without merging it. + * + * Return: true if the fragment is consumed/forwarded, false otherwise. + */ +bool batadv_frag_skb_fwd(struct sk_buff *skb, + struct batadv_hard_iface *recv_if, + struct batadv_orig_node *orig_node_src) +{ + struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); + struct batadv_orig_node *orig_node_dst; + struct batadv_neigh_node *neigh_node = NULL; + struct batadv_frag_packet *packet; + u16 total_size; + bool ret = false; + + packet = (struct batadv_frag_packet *)skb->data; + orig_node_dst = batadv_orig_hash_find(bat_priv, packet->dest); + if (!orig_node_dst) + goto out; + + neigh_node = batadv_find_router(bat_priv, orig_node_dst, recv_if); + if (!neigh_node) + goto out; + + /* Forward the fragment, if the merged packet would be too big to + * be assembled. + */ + total_size = ntohs(packet->total_size); + if (total_size > neigh_node->if_incoming->net_dev->mtu) { + batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_FWD); + batadv_add_counter(bat_priv, BATADV_CNT_FRAG_FWD_BYTES, + skb->len + ETH_HLEN); + + packet->ttl--; + batadv_send_unicast_skb(skb, neigh_node); + ret = true; + } + +out: + batadv_orig_node_put(orig_node_dst); + batadv_neigh_node_put(neigh_node); + return ret; +} + +/** + * batadv_frag_create() - create a fragment from skb + * @net_dev: outgoing device for fragment + * @skb: skb to create fragment from + * @frag_head: header to use in new fragment + * @fragment_size: size of new fragment + * + * Split the passed skb into two fragments: A new one with size matching the + * passed mtu and the old one with the rest. The new skb contains data from the + * tail of the old skb. + * + * Return: the new fragment, NULL on error. + */ +static struct sk_buff *batadv_frag_create(struct net_device *net_dev, + struct sk_buff *skb, + struct batadv_frag_packet *frag_head, + unsigned int fragment_size) +{ + unsigned int ll_reserved = LL_RESERVED_SPACE(net_dev); + unsigned int tailroom = net_dev->needed_tailroom; + struct sk_buff *skb_fragment; + unsigned int header_size = sizeof(*frag_head); + unsigned int mtu = fragment_size + header_size; + + skb_fragment = dev_alloc_skb(ll_reserved + mtu + tailroom); + if (!skb_fragment) + goto err; + + skb_fragment->priority = skb->priority; + + /* Eat the last mtu-bytes of the skb */ + skb_reserve(skb_fragment, ll_reserved + header_size); + skb_split(skb, skb_fragment, skb->len - fragment_size); + + /* Add the header */ + skb_push(skb_fragment, header_size); + memcpy(skb_fragment->data, frag_head, header_size); + +err: + return skb_fragment; +} + +/** + * batadv_frag_send_packet() - create up to 16 fragments from the passed skb + * @skb: skb to create fragments from + * @orig_node: final destination of the created fragments + * @neigh_node: next-hop of the created fragments + * + * Return: the netdev tx status or a negative errno code on a failure + */ +int batadv_frag_send_packet(struct sk_buff *skb, + struct batadv_orig_node *orig_node, + struct batadv_neigh_node *neigh_node) +{ + struct net_device *net_dev = neigh_node->if_incoming->net_dev; + struct batadv_priv *bat_priv; + struct batadv_hard_iface *primary_if = NULL; + struct batadv_frag_packet frag_header; + struct sk_buff *skb_fragment; + unsigned int mtu = net_dev->mtu; + unsigned int header_size = sizeof(frag_header); + unsigned int max_fragment_size, num_fragments; + int ret; + + /* To avoid merge and refragmentation at next-hops we never send + * fragments larger than BATADV_FRAG_MAX_FRAG_SIZE + */ + mtu = min_t(unsigned int, mtu, BATADV_FRAG_MAX_FRAG_SIZE); + max_fragment_size = mtu - header_size; + + if (skb->len == 0 || max_fragment_size == 0) + return -EINVAL; + + num_fragments = (skb->len - 1) / max_fragment_size + 1; + max_fragment_size = (skb->len - 1) / num_fragments + 1; + + /* Don't even try to fragment, if we need more than 16 fragments */ + if (num_fragments > BATADV_FRAG_MAX_FRAGMENTS) { + ret = -EAGAIN; + goto free_skb; + } + + bat_priv = orig_node->bat_priv; + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) { + ret = -EINVAL; + goto free_skb; + } + + /* GRO might have added fragments to the fragment list instead of + * frags[]. But this is not handled by skb_split and must be + * linearized to avoid incorrect length information after all + * batman-adv fragments were created and submitted to the + * hard-interface + */ + if (skb_has_frag_list(skb) && __skb_linearize(skb)) { + ret = -ENOMEM; + goto free_skb; + } + + /* Create one header to be copied to all fragments */ + frag_header.packet_type = BATADV_UNICAST_FRAG; + frag_header.version = BATADV_COMPAT_VERSION; + frag_header.ttl = BATADV_TTL; + frag_header.seqno = htons(atomic_inc_return(&bat_priv->frag_seqno)); + frag_header.reserved = 0; + frag_header.no = 0; + frag_header.total_size = htons(skb->len); + + /* skb->priority values from 256->263 are magic values to + * directly indicate a specific 802.1d priority. This is used + * to allow 802.1d priority to be passed directly in from VLAN + * tags, etc. + */ + if (skb->priority >= 256 && skb->priority <= 263) + frag_header.priority = skb->priority - 256; + else + frag_header.priority = 0; + + ether_addr_copy(frag_header.orig, primary_if->net_dev->dev_addr); + ether_addr_copy(frag_header.dest, orig_node->orig); + + /* Eat and send fragments from the tail of skb */ + while (skb->len > max_fragment_size) { + /* The initial check in this function should cover this case */ + if (unlikely(frag_header.no == BATADV_FRAG_MAX_FRAGMENTS - 1)) { + ret = -EINVAL; + goto put_primary_if; + } + + skb_fragment = batadv_frag_create(net_dev, skb, &frag_header, + max_fragment_size); + if (!skb_fragment) { + ret = -ENOMEM; + goto put_primary_if; + } + + batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_TX); + batadv_add_counter(bat_priv, BATADV_CNT_FRAG_TX_BYTES, + skb_fragment->len + ETH_HLEN); + ret = batadv_send_unicast_skb(skb_fragment, neigh_node); + if (ret != NET_XMIT_SUCCESS) { + ret = NET_XMIT_DROP; + goto put_primary_if; + } + + frag_header.no++; + } + + /* make sure that there is at least enough head for the fragmentation + * and ethernet headers + */ + ret = skb_cow_head(skb, ETH_HLEN + header_size); + if (ret < 0) + goto put_primary_if; + + skb_push(skb, header_size); + memcpy(skb->data, &frag_header, header_size); + + /* Send the last fragment */ + batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_TX); + batadv_add_counter(bat_priv, BATADV_CNT_FRAG_TX_BYTES, + skb->len + ETH_HLEN); + ret = batadv_send_unicast_skb(skb, neigh_node); + /* skb was consumed */ + skb = NULL; + +put_primary_if: + batadv_hardif_put(primary_if); +free_skb: + kfree_skb(skb); + + return ret; +} diff --git a/net/batman-adv/fragmentation.h b/net/batman-adv/fragmentation.h new file mode 100644 index 000000000..dbf0871f8 --- /dev/null +++ b/net/batman-adv/fragmentation.h @@ -0,0 +1,44 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Martin Hundebøll <martin@hundeboll.net> + */ + +#ifndef _NET_BATMAN_ADV_FRAGMENTATION_H_ +#define _NET_BATMAN_ADV_FRAGMENTATION_H_ + +#include "main.h" + +#include <linux/compiler.h> +#include <linux/list.h> +#include <linux/skbuff.h> +#include <linux/stddef.h> +#include <linux/types.h> + +void batadv_frag_purge_orig(struct batadv_orig_node *orig, + bool (*check_cb)(struct batadv_frag_table_entry *)); +bool batadv_frag_skb_fwd(struct sk_buff *skb, + struct batadv_hard_iface *recv_if, + struct batadv_orig_node *orig_node_src); +bool batadv_frag_skb_buffer(struct sk_buff **skb, + struct batadv_orig_node *orig_node); +int batadv_frag_send_packet(struct sk_buff *skb, + struct batadv_orig_node *orig_node, + struct batadv_neigh_node *neigh_node); + +/** + * batadv_frag_check_entry() - check if a list of fragments has timed out + * @frags_entry: table entry to check + * + * Return: true if the frags entry has timed out, false otherwise. + */ +static inline bool +batadv_frag_check_entry(struct batadv_frag_table_entry *frags_entry) +{ + if (!hlist_empty(&frags_entry->fragment_list) && + batadv_has_timed_out(frags_entry->timestamp, BATADV_FRAG_TIMEOUT)) + return true; + return false; +} + +#endif /* _NET_BATMAN_ADV_FRAGMENTATION_H_ */ diff --git a/net/batman-adv/gateway_client.c b/net/batman-adv/gateway_client.c new file mode 100644 index 000000000..d26124bc2 --- /dev/null +++ b/net/batman-adv/gateway_client.c @@ -0,0 +1,769 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner + */ + +#include "gateway_client.h" +#include "main.h" + +#include <linux/atomic.h> +#include <linux/byteorder/generic.h> +#include <linux/container_of.h> +#include <linux/errno.h> +#include <linux/etherdevice.h> +#include <linux/gfp.h> +#include <linux/if_ether.h> +#include <linux/if_vlan.h> +#include <linux/in.h> +#include <linux/ip.h> +#include <linux/ipv6.h> +#include <linux/kernel.h> +#include <linux/kref.h> +#include <linux/list.h> +#include <linux/lockdep.h> +#include <linux/netdevice.h> +#include <linux/netlink.h> +#include <linux/rculist.h> +#include <linux/rcupdate.h> +#include <linux/skbuff.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/stddef.h> +#include <linux/udp.h> +#include <net/sock.h> +#include <uapi/linux/batadv_packet.h> +#include <uapi/linux/batman_adv.h> + +#include "hard-interface.h" +#include "log.h" +#include "netlink.h" +#include "originator.h" +#include "routing.h" +#include "soft-interface.h" +#include "translation-table.h" + +/* These are the offsets of the "hw type" and "hw address length" in the dhcp + * packet starting at the beginning of the dhcp header + */ +#define BATADV_DHCP_HTYPE_OFFSET 1 +#define BATADV_DHCP_HLEN_OFFSET 2 +/* Value of htype representing Ethernet */ +#define BATADV_DHCP_HTYPE_ETHERNET 0x01 +/* This is the offset of the "chaddr" field in the dhcp packet starting at the + * beginning of the dhcp header + */ +#define BATADV_DHCP_CHADDR_OFFSET 28 + +/** + * batadv_gw_node_release() - release gw_node from lists and queue for free + * after rcu grace period + * @ref: kref pointer of the gw_node + */ +void batadv_gw_node_release(struct kref *ref) +{ + struct batadv_gw_node *gw_node; + + gw_node = container_of(ref, struct batadv_gw_node, refcount); + + batadv_orig_node_put(gw_node->orig_node); + kfree_rcu(gw_node, rcu); +} + +/** + * batadv_gw_get_selected_gw_node() - Get currently selected gateway + * @bat_priv: the bat priv with all the soft interface information + * + * Return: selected gateway (with increased refcnt), NULL on errors + */ +struct batadv_gw_node * +batadv_gw_get_selected_gw_node(struct batadv_priv *bat_priv) +{ + struct batadv_gw_node *gw_node; + + rcu_read_lock(); + gw_node = rcu_dereference(bat_priv->gw.curr_gw); + if (!gw_node) + goto out; + + if (!kref_get_unless_zero(&gw_node->refcount)) + gw_node = NULL; + +out: + rcu_read_unlock(); + return gw_node; +} + +/** + * batadv_gw_get_selected_orig() - Get originator of currently selected gateway + * @bat_priv: the bat priv with all the soft interface information + * + * Return: orig_node of selected gateway (with increased refcnt), NULL on errors + */ +struct batadv_orig_node * +batadv_gw_get_selected_orig(struct batadv_priv *bat_priv) +{ + struct batadv_gw_node *gw_node; + struct batadv_orig_node *orig_node = NULL; + + gw_node = batadv_gw_get_selected_gw_node(bat_priv); + if (!gw_node) + goto out; + + rcu_read_lock(); + orig_node = gw_node->orig_node; + if (!orig_node) + goto unlock; + + if (!kref_get_unless_zero(&orig_node->refcount)) + orig_node = NULL; + +unlock: + rcu_read_unlock(); +out: + batadv_gw_node_put(gw_node); + return orig_node; +} + +static void batadv_gw_select(struct batadv_priv *bat_priv, + struct batadv_gw_node *new_gw_node) +{ + struct batadv_gw_node *curr_gw_node; + + spin_lock_bh(&bat_priv->gw.list_lock); + + if (new_gw_node) + kref_get(&new_gw_node->refcount); + + curr_gw_node = rcu_replace_pointer(bat_priv->gw.curr_gw, new_gw_node, + true); + + batadv_gw_node_put(curr_gw_node); + + spin_unlock_bh(&bat_priv->gw.list_lock); +} + +/** + * batadv_gw_reselect() - force a gateway reselection + * @bat_priv: the bat priv with all the soft interface information + * + * Set a flag to remind the GW component to perform a new gateway reselection. + * However this function does not ensure that the current gateway is going to be + * deselected. The reselection mechanism may elect the same gateway once again. + * + * This means that invoking batadv_gw_reselect() does not guarantee a gateway + * change and therefore a uevent is not necessarily expected. + */ +void batadv_gw_reselect(struct batadv_priv *bat_priv) +{ + atomic_set(&bat_priv->gw.reselect, 1); +} + +/** + * batadv_gw_check_client_stop() - check if client mode has been switched off + * @bat_priv: the bat priv with all the soft interface information + * + * This function assumes the caller has checked that the gw state *is actually + * changing*. This function is not supposed to be called when there is no state + * change. + */ +void batadv_gw_check_client_stop(struct batadv_priv *bat_priv) +{ + struct batadv_gw_node *curr_gw; + + if (atomic_read(&bat_priv->gw.mode) != BATADV_GW_MODE_CLIENT) + return; + + curr_gw = batadv_gw_get_selected_gw_node(bat_priv); + if (!curr_gw) + return; + + /* deselect the current gateway so that next time that client mode is + * enabled a proper GW_ADD event can be sent + */ + batadv_gw_select(bat_priv, NULL); + + /* if batman-adv is switching the gw client mode off and a gateway was + * already selected, send a DEL uevent + */ + batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, NULL); + + batadv_gw_node_put(curr_gw); +} + +/** + * batadv_gw_election() - Elect the best gateway + * @bat_priv: the bat priv with all the soft interface information + */ +void batadv_gw_election(struct batadv_priv *bat_priv) +{ + struct batadv_gw_node *curr_gw = NULL; + struct batadv_gw_node *next_gw = NULL; + struct batadv_neigh_node *router = NULL; + struct batadv_neigh_ifinfo *router_ifinfo = NULL; + char gw_addr[18] = { '\0' }; + + if (atomic_read(&bat_priv->gw.mode) != BATADV_GW_MODE_CLIENT) + goto out; + + if (!bat_priv->algo_ops->gw.get_best_gw_node) + goto out; + + curr_gw = batadv_gw_get_selected_gw_node(bat_priv); + + if (!batadv_atomic_dec_not_zero(&bat_priv->gw.reselect) && curr_gw) + goto out; + + /* if gw.reselect is set to 1 it means that a previous call to + * gw.is_eligible() said that we have a new best GW, therefore it can + * now be picked from the list and selected + */ + next_gw = bat_priv->algo_ops->gw.get_best_gw_node(bat_priv); + + if (curr_gw == next_gw) + goto out; + + if (next_gw) { + sprintf(gw_addr, "%pM", next_gw->orig_node->orig); + + router = batadv_orig_router_get(next_gw->orig_node, + BATADV_IF_DEFAULT); + if (!router) { + batadv_gw_reselect(bat_priv); + goto out; + } + + router_ifinfo = batadv_neigh_ifinfo_get(router, + BATADV_IF_DEFAULT); + if (!router_ifinfo) { + batadv_gw_reselect(bat_priv); + goto out; + } + } + + if (curr_gw && !next_gw) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Removing selected gateway - no gateway in range\n"); + batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, + NULL); + } else if (!curr_gw && next_gw) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Adding route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", + next_gw->orig_node->orig, + next_gw->bandwidth_down / 10, + next_gw->bandwidth_down % 10, + next_gw->bandwidth_up / 10, + next_gw->bandwidth_up % 10, + router_ifinfo->bat_iv.tq_avg); + batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_ADD, + gw_addr); + } else { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Changing route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", + next_gw->orig_node->orig, + next_gw->bandwidth_down / 10, + next_gw->bandwidth_down % 10, + next_gw->bandwidth_up / 10, + next_gw->bandwidth_up % 10, + router_ifinfo->bat_iv.tq_avg); + batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_CHANGE, + gw_addr); + } + + batadv_gw_select(bat_priv, next_gw); + +out: + batadv_gw_node_put(curr_gw); + batadv_gw_node_put(next_gw); + batadv_neigh_node_put(router); + batadv_neigh_ifinfo_put(router_ifinfo); +} + +/** + * batadv_gw_check_election() - Elect orig node as best gateway when eligible + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: orig node which is to be checked + */ +void batadv_gw_check_election(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node) +{ + struct batadv_orig_node *curr_gw_orig; + + /* abort immediately if the routing algorithm does not support gateway + * election + */ + if (!bat_priv->algo_ops->gw.is_eligible) + return; + + curr_gw_orig = batadv_gw_get_selected_orig(bat_priv); + if (!curr_gw_orig) + goto reselect; + + /* this node already is the gateway */ + if (curr_gw_orig == orig_node) + goto out; + + if (!bat_priv->algo_ops->gw.is_eligible(bat_priv, curr_gw_orig, + orig_node)) + goto out; + +reselect: + batadv_gw_reselect(bat_priv); +out: + batadv_orig_node_put(curr_gw_orig); +} + +/** + * batadv_gw_node_add() - add gateway node to list of available gateways + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: originator announcing gateway capabilities + * @gateway: announced bandwidth information + * + * Has to be called with the appropriate locks being acquired + * (gw.list_lock). + */ +static void batadv_gw_node_add(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + struct batadv_tvlv_gateway_data *gateway) +{ + struct batadv_gw_node *gw_node; + + lockdep_assert_held(&bat_priv->gw.list_lock); + + if (gateway->bandwidth_down == 0) + return; + + gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); + if (!gw_node) + return; + + kref_init(&gw_node->refcount); + INIT_HLIST_NODE(&gw_node->list); + kref_get(&orig_node->refcount); + gw_node->orig_node = orig_node; + gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); + gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); + + kref_get(&gw_node->refcount); + hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.gateway_list); + bat_priv->gw.generation++; + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Found new gateway %pM -> gw bandwidth: %u.%u/%u.%u MBit\n", + orig_node->orig, + ntohl(gateway->bandwidth_down) / 10, + ntohl(gateway->bandwidth_down) % 10, + ntohl(gateway->bandwidth_up) / 10, + ntohl(gateway->bandwidth_up) % 10); + + /* don't return reference to new gw_node */ + batadv_gw_node_put(gw_node); +} + +/** + * batadv_gw_node_get() - retrieve gateway node from list of available gateways + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: originator announcing gateway capabilities + * + * Return: gateway node if found or NULL otherwise. + */ +struct batadv_gw_node *batadv_gw_node_get(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node) +{ + struct batadv_gw_node *gw_node_tmp, *gw_node = NULL; + + rcu_read_lock(); + hlist_for_each_entry_rcu(gw_node_tmp, &bat_priv->gw.gateway_list, + list) { + if (gw_node_tmp->orig_node != orig_node) + continue; + + if (!kref_get_unless_zero(&gw_node_tmp->refcount)) + continue; + + gw_node = gw_node_tmp; + break; + } + rcu_read_unlock(); + + return gw_node; +} + +/** + * batadv_gw_node_update() - update list of available gateways with changed + * bandwidth information + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: originator announcing gateway capabilities + * @gateway: announced bandwidth information + */ +void batadv_gw_node_update(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + struct batadv_tvlv_gateway_data *gateway) +{ + struct batadv_gw_node *gw_node, *curr_gw = NULL; + + spin_lock_bh(&bat_priv->gw.list_lock); + gw_node = batadv_gw_node_get(bat_priv, orig_node); + if (!gw_node) { + batadv_gw_node_add(bat_priv, orig_node, gateway); + spin_unlock_bh(&bat_priv->gw.list_lock); + goto out; + } + spin_unlock_bh(&bat_priv->gw.list_lock); + + if (gw_node->bandwidth_down == ntohl(gateway->bandwidth_down) && + gw_node->bandwidth_up == ntohl(gateway->bandwidth_up)) + goto out; + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Gateway bandwidth of originator %pM changed from %u.%u/%u.%u MBit to %u.%u/%u.%u MBit\n", + orig_node->orig, + gw_node->bandwidth_down / 10, + gw_node->bandwidth_down % 10, + gw_node->bandwidth_up / 10, + gw_node->bandwidth_up % 10, + ntohl(gateway->bandwidth_down) / 10, + ntohl(gateway->bandwidth_down) % 10, + ntohl(gateway->bandwidth_up) / 10, + ntohl(gateway->bandwidth_up) % 10); + + gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); + gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); + + if (ntohl(gateway->bandwidth_down) == 0) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Gateway %pM removed from gateway list\n", + orig_node->orig); + + /* Note: We don't need a NULL check here, since curr_gw never + * gets dereferenced. + */ + spin_lock_bh(&bat_priv->gw.list_lock); + if (!hlist_unhashed(&gw_node->list)) { + hlist_del_init_rcu(&gw_node->list); + batadv_gw_node_put(gw_node); + bat_priv->gw.generation++; + } + spin_unlock_bh(&bat_priv->gw.list_lock); + + curr_gw = batadv_gw_get_selected_gw_node(bat_priv); + if (gw_node == curr_gw) + batadv_gw_reselect(bat_priv); + + batadv_gw_node_put(curr_gw); + } + +out: + batadv_gw_node_put(gw_node); +} + +/** + * batadv_gw_node_delete() - Remove orig_node from gateway list + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: orig node which is currently in process of being removed + */ +void batadv_gw_node_delete(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node) +{ + struct batadv_tvlv_gateway_data gateway; + + gateway.bandwidth_down = 0; + gateway.bandwidth_up = 0; + + batadv_gw_node_update(bat_priv, orig_node, &gateway); +} + +/** + * batadv_gw_node_free() - Free gateway information from soft interface + * @bat_priv: the bat priv with all the soft interface information + */ +void batadv_gw_node_free(struct batadv_priv *bat_priv) +{ + struct batadv_gw_node *gw_node; + struct hlist_node *node_tmp; + + spin_lock_bh(&bat_priv->gw.list_lock); + hlist_for_each_entry_safe(gw_node, node_tmp, + &bat_priv->gw.gateway_list, list) { + hlist_del_init_rcu(&gw_node->list); + batadv_gw_node_put(gw_node); + bat_priv->gw.generation++; + } + spin_unlock_bh(&bat_priv->gw.list_lock); +} + +/** + * batadv_gw_dump() - Dump gateways into a message + * @msg: Netlink message to dump into + * @cb: Control block containing additional options + * + * Return: Error code, or length of message + */ +int batadv_gw_dump(struct sk_buff *msg, struct netlink_callback *cb) +{ + struct batadv_hard_iface *primary_if = NULL; + struct net *net = sock_net(cb->skb->sk); + struct net_device *soft_iface; + struct batadv_priv *bat_priv; + int ifindex; + int ret; + + ifindex = batadv_netlink_get_ifindex(cb->nlh, + BATADV_ATTR_MESH_IFINDEX); + if (!ifindex) + return -EINVAL; + + soft_iface = dev_get_by_index(net, ifindex); + if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { + ret = -ENODEV; + goto out; + } + + bat_priv = netdev_priv(soft_iface); + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { + ret = -ENOENT; + goto out; + } + + if (!bat_priv->algo_ops->gw.dump) { + ret = -EOPNOTSUPP; + goto out; + } + + bat_priv->algo_ops->gw.dump(msg, cb, bat_priv); + + ret = msg->len; + +out: + batadv_hardif_put(primary_if); + dev_put(soft_iface); + + return ret; +} + +/** + * batadv_gw_dhcp_recipient_get() - check if a packet is a DHCP message + * @skb: the packet to check + * @header_len: a pointer to the batman-adv header size + * @chaddr: buffer where the client address will be stored. Valid + * only if the function returns BATADV_DHCP_TO_CLIENT + * + * This function may re-allocate the data buffer of the skb passed as argument. + * + * Return: + * - BATADV_DHCP_NO if the packet is not a dhcp message or if there was an error + * while parsing it + * - BATADV_DHCP_TO_SERVER if this is a message going to the DHCP server + * - BATADV_DHCP_TO_CLIENT if this is a message going to a DHCP client + */ +enum batadv_dhcp_recipient +batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len, + u8 *chaddr) +{ + enum batadv_dhcp_recipient ret = BATADV_DHCP_NO; + struct ethhdr *ethhdr; + struct iphdr *iphdr; + struct ipv6hdr *ipv6hdr; + struct udphdr *udphdr; + struct vlan_ethhdr *vhdr; + int chaddr_offset; + __be16 proto; + u8 *p; + + /* check for ethernet header */ + if (!pskb_may_pull(skb, *header_len + ETH_HLEN)) + return BATADV_DHCP_NO; + + ethhdr = eth_hdr(skb); + proto = ethhdr->h_proto; + *header_len += ETH_HLEN; + + /* check for initial vlan header */ + if (proto == htons(ETH_P_8021Q)) { + if (!pskb_may_pull(skb, *header_len + VLAN_HLEN)) + return BATADV_DHCP_NO; + + vhdr = vlan_eth_hdr(skb); + proto = vhdr->h_vlan_encapsulated_proto; + *header_len += VLAN_HLEN; + } + + /* check for ip header */ + switch (proto) { + case htons(ETH_P_IP): + if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr))) + return BATADV_DHCP_NO; + + iphdr = (struct iphdr *)(skb->data + *header_len); + *header_len += iphdr->ihl * 4; + + /* check for udp header */ + if (iphdr->protocol != IPPROTO_UDP) + return BATADV_DHCP_NO; + + break; + case htons(ETH_P_IPV6): + if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr))) + return BATADV_DHCP_NO; + + ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len); + *header_len += sizeof(*ipv6hdr); + + /* check for udp header */ + if (ipv6hdr->nexthdr != IPPROTO_UDP) + return BATADV_DHCP_NO; + + break; + default: + return BATADV_DHCP_NO; + } + + if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr))) + return BATADV_DHCP_NO; + + udphdr = (struct udphdr *)(skb->data + *header_len); + *header_len += sizeof(*udphdr); + + /* check for bootp port */ + switch (proto) { + case htons(ETH_P_IP): + if (udphdr->dest == htons(67)) + ret = BATADV_DHCP_TO_SERVER; + else if (udphdr->source == htons(67)) + ret = BATADV_DHCP_TO_CLIENT; + break; + case htons(ETH_P_IPV6): + if (udphdr->dest == htons(547)) + ret = BATADV_DHCP_TO_SERVER; + else if (udphdr->source == htons(547)) + ret = BATADV_DHCP_TO_CLIENT; + break; + } + + chaddr_offset = *header_len + BATADV_DHCP_CHADDR_OFFSET; + /* store the client address if the message is going to a client */ + if (ret == BATADV_DHCP_TO_CLIENT) { + if (!pskb_may_pull(skb, chaddr_offset + ETH_ALEN)) + return BATADV_DHCP_NO; + + /* check if the DHCP packet carries an Ethernet DHCP */ + p = skb->data + *header_len + BATADV_DHCP_HTYPE_OFFSET; + if (*p != BATADV_DHCP_HTYPE_ETHERNET) + return BATADV_DHCP_NO; + + /* check if the DHCP packet carries a valid Ethernet address */ + p = skb->data + *header_len + BATADV_DHCP_HLEN_OFFSET; + if (*p != ETH_ALEN) + return BATADV_DHCP_NO; + + ether_addr_copy(chaddr, skb->data + chaddr_offset); + } + + return ret; +} + +/** + * batadv_gw_out_of_range() - check if the dhcp request destination is the best + * gateway + * @bat_priv: the bat priv with all the soft interface information + * @skb: the outgoing packet + * + * Check if the skb is a DHCP request and if it is sent to the current best GW + * server. Due to topology changes it may be the case that the GW server + * previously selected is not the best one anymore. + * + * This call might reallocate skb data. + * Must be invoked only when the DHCP packet is going TO a DHCP SERVER. + * + * Return: true if the packet destination is unicast and it is not the best gw, + * false otherwise. + */ +bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, + struct sk_buff *skb) +{ + struct batadv_neigh_node *neigh_curr = NULL; + struct batadv_neigh_node *neigh_old = NULL; + struct batadv_orig_node *orig_dst_node = NULL; + struct batadv_gw_node *gw_node = NULL; + struct batadv_gw_node *curr_gw = NULL; + struct batadv_neigh_ifinfo *curr_ifinfo, *old_ifinfo; + struct ethhdr *ethhdr = (struct ethhdr *)skb->data; + bool out_of_range = false; + u8 curr_tq_avg; + unsigned short vid; + + vid = batadv_get_vid(skb, 0); + + if (is_multicast_ether_addr(ethhdr->h_dest)) + goto out; + + orig_dst_node = batadv_transtable_search(bat_priv, ethhdr->h_source, + ethhdr->h_dest, vid); + if (!orig_dst_node) + goto out; + + gw_node = batadv_gw_node_get(bat_priv, orig_dst_node); + if (!gw_node) + goto out; + + switch (atomic_read(&bat_priv->gw.mode)) { + case BATADV_GW_MODE_SERVER: + /* If we are a GW then we are our best GW. We can artificially + * set the tq towards ourself as the maximum value + */ + curr_tq_avg = BATADV_TQ_MAX_VALUE; + break; + case BATADV_GW_MODE_CLIENT: + curr_gw = batadv_gw_get_selected_gw_node(bat_priv); + if (!curr_gw) + goto out; + + /* packet is going to our gateway */ + if (curr_gw->orig_node == orig_dst_node) + goto out; + + /* If the dhcp packet has been sent to a different gw, + * we have to evaluate whether the old gw is still + * reliable enough + */ + neigh_curr = batadv_find_router(bat_priv, curr_gw->orig_node, + NULL); + if (!neigh_curr) + goto out; + + curr_ifinfo = batadv_neigh_ifinfo_get(neigh_curr, + BATADV_IF_DEFAULT); + if (!curr_ifinfo) + goto out; + + curr_tq_avg = curr_ifinfo->bat_iv.tq_avg; + batadv_neigh_ifinfo_put(curr_ifinfo); + + break; + case BATADV_GW_MODE_OFF: + default: + goto out; + } + + neigh_old = batadv_find_router(bat_priv, orig_dst_node, NULL); + if (!neigh_old) + goto out; + + old_ifinfo = batadv_neigh_ifinfo_get(neigh_old, BATADV_IF_DEFAULT); + if (!old_ifinfo) + goto out; + + if ((curr_tq_avg - old_ifinfo->bat_iv.tq_avg) > BATADV_GW_THRESHOLD) + out_of_range = true; + batadv_neigh_ifinfo_put(old_ifinfo); + +out: + batadv_orig_node_put(orig_dst_node); + batadv_gw_node_put(curr_gw); + batadv_gw_node_put(gw_node); + batadv_neigh_node_put(neigh_old); + batadv_neigh_node_put(neigh_curr); + return out_of_range; +} diff --git a/net/batman-adv/gateway_client.h b/net/batman-adv/gateway_client.h new file mode 100644 index 000000000..95c2ccdaa --- /dev/null +++ b/net/batman-adv/gateway_client.h @@ -0,0 +1,55 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner + */ + +#ifndef _NET_BATMAN_ADV_GATEWAY_CLIENT_H_ +#define _NET_BATMAN_ADV_GATEWAY_CLIENT_H_ + +#include "main.h" + +#include <linux/kref.h> +#include <linux/netlink.h> +#include <linux/skbuff.h> +#include <linux/types.h> +#include <uapi/linux/batadv_packet.h> + +void batadv_gw_check_client_stop(struct batadv_priv *bat_priv); +void batadv_gw_reselect(struct batadv_priv *bat_priv); +void batadv_gw_election(struct batadv_priv *bat_priv); +struct batadv_orig_node * +batadv_gw_get_selected_orig(struct batadv_priv *bat_priv); +void batadv_gw_check_election(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node); +void batadv_gw_node_update(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + struct batadv_tvlv_gateway_data *gateway); +void batadv_gw_node_delete(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node); +void batadv_gw_node_free(struct batadv_priv *bat_priv); +void batadv_gw_node_release(struct kref *ref); +struct batadv_gw_node * +batadv_gw_get_selected_gw_node(struct batadv_priv *bat_priv); +int batadv_gw_dump(struct sk_buff *msg, struct netlink_callback *cb); +bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, struct sk_buff *skb); +enum batadv_dhcp_recipient +batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len, + u8 *chaddr); +struct batadv_gw_node *batadv_gw_node_get(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node); + +/** + * batadv_gw_node_put() - decrement the gw_node refcounter and possibly release + * it + * @gw_node: gateway node to free + */ +static inline void batadv_gw_node_put(struct batadv_gw_node *gw_node) +{ + if (!gw_node) + return; + + kref_put(&gw_node->refcount, batadv_gw_node_release); +} + +#endif /* _NET_BATMAN_ADV_GATEWAY_CLIENT_H_ */ diff --git a/net/batman-adv/gateway_common.c b/net/batman-adv/gateway_common.c new file mode 100644 index 000000000..9349c76f3 --- /dev/null +++ b/net/batman-adv/gateway_common.c @@ -0,0 +1,274 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner + */ + +#include "gateway_common.h" +#include "main.h" + +#include <linux/atomic.h> +#include <linux/byteorder/generic.h> +#include <linux/errno.h> +#include <linux/kstrtox.h> +#include <linux/limits.h> +#include <linux/math64.h> +#include <linux/netdevice.h> +#include <linux/stddef.h> +#include <linux/string.h> +#include <uapi/linux/batadv_packet.h> +#include <uapi/linux/batman_adv.h> + +#include "gateway_client.h" +#include "log.h" +#include "tvlv.h" + +/** + * batadv_parse_throughput() - parse supplied string buffer to extract + * throughput information + * @net_dev: the soft interface net device + * @buff: string buffer to parse + * @description: text shown when throughput string cannot be parsed + * @throughput: pointer holding the returned throughput information + * + * Return: false on parse error and true otherwise. + */ +bool batadv_parse_throughput(struct net_device *net_dev, char *buff, + const char *description, u32 *throughput) +{ + enum batadv_bandwidth_units bw_unit_type = BATADV_BW_UNIT_KBIT; + u64 lthroughput; + char *tmp_ptr; + int ret; + + if (strlen(buff) > 4) { + tmp_ptr = buff + strlen(buff) - 4; + + if (strncasecmp(tmp_ptr, "mbit", 4) == 0) + bw_unit_type = BATADV_BW_UNIT_MBIT; + + if (strncasecmp(tmp_ptr, "kbit", 4) == 0 || + bw_unit_type == BATADV_BW_UNIT_MBIT) + *tmp_ptr = '\0'; + } + + ret = kstrtou64(buff, 10, <hroughput); + if (ret) { + batadv_err(net_dev, + "Invalid throughput speed for %s: %s\n", + description, buff); + return false; + } + + switch (bw_unit_type) { + case BATADV_BW_UNIT_MBIT: + /* prevent overflow */ + if (U64_MAX / 10 < lthroughput) { + batadv_err(net_dev, + "Throughput speed for %s too large: %s\n", + description, buff); + return false; + } + + lthroughput *= 10; + break; + case BATADV_BW_UNIT_KBIT: + default: + lthroughput = div_u64(lthroughput, 100); + break; + } + + if (lthroughput > U32_MAX) { + batadv_err(net_dev, + "Throughput speed for %s too large: %s\n", + description, buff); + return false; + } + + *throughput = lthroughput; + + return true; +} + +/** + * batadv_parse_gw_bandwidth() - parse supplied string buffer to extract + * download and upload bandwidth information + * @net_dev: the soft interface net device + * @buff: string buffer to parse + * @down: pointer holding the returned download bandwidth information + * @up: pointer holding the returned upload bandwidth information + * + * Return: false on parse error and true otherwise. + */ +static bool batadv_parse_gw_bandwidth(struct net_device *net_dev, char *buff, + u32 *down, u32 *up) +{ + char *slash_ptr; + bool ret; + + slash_ptr = strchr(buff, '/'); + if (slash_ptr) + *slash_ptr = 0; + + ret = batadv_parse_throughput(net_dev, buff, "download gateway speed", + down); + if (!ret) + return false; + + /* we also got some upload info */ + if (slash_ptr) { + ret = batadv_parse_throughput(net_dev, slash_ptr + 1, + "upload gateway speed", up); + if (!ret) + return false; + } + + return true; +} + +/** + * batadv_gw_tvlv_container_update() - update the gw tvlv container after + * gateway setting change + * @bat_priv: the bat priv with all the soft interface information + */ +void batadv_gw_tvlv_container_update(struct batadv_priv *bat_priv) +{ + struct batadv_tvlv_gateway_data gw; + u32 down, up; + char gw_mode; + + gw_mode = atomic_read(&bat_priv->gw.mode); + + switch (gw_mode) { + case BATADV_GW_MODE_OFF: + case BATADV_GW_MODE_CLIENT: + batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_GW, 1); + break; + case BATADV_GW_MODE_SERVER: + down = atomic_read(&bat_priv->gw.bandwidth_down); + up = atomic_read(&bat_priv->gw.bandwidth_up); + gw.bandwidth_down = htonl(down); + gw.bandwidth_up = htonl(up); + batadv_tvlv_container_register(bat_priv, BATADV_TVLV_GW, 1, + &gw, sizeof(gw)); + break; + } +} + +/** + * batadv_gw_bandwidth_set() - Parse and set download/upload gateway bandwidth + * from supplied string buffer + * @net_dev: netdev struct of the soft interface + * @buff: the buffer containing the user data + * @count: number of bytes in the buffer + * + * Return: 'count' on success or a negative error code in case of failure + */ +ssize_t batadv_gw_bandwidth_set(struct net_device *net_dev, char *buff, + size_t count) +{ + struct batadv_priv *bat_priv = netdev_priv(net_dev); + u32 down_curr; + u32 up_curr; + u32 down_new = 0; + u32 up_new = 0; + bool ret; + + down_curr = (unsigned int)atomic_read(&bat_priv->gw.bandwidth_down); + up_curr = (unsigned int)atomic_read(&bat_priv->gw.bandwidth_up); + + ret = batadv_parse_gw_bandwidth(net_dev, buff, &down_new, &up_new); + if (!ret) + return -EINVAL; + + if (!down_new) + down_new = 1; + + if (!up_new) + up_new = down_new / 5; + + if (!up_new) + up_new = 1; + + if (down_curr == down_new && up_curr == up_new) + return count; + + batadv_gw_reselect(bat_priv); + batadv_info(net_dev, + "Changing gateway bandwidth from: '%u.%u/%u.%u MBit' to: '%u.%u/%u.%u MBit'\n", + down_curr / 10, down_curr % 10, up_curr / 10, up_curr % 10, + down_new / 10, down_new % 10, up_new / 10, up_new % 10); + + atomic_set(&bat_priv->gw.bandwidth_down, down_new); + atomic_set(&bat_priv->gw.bandwidth_up, up_new); + batadv_gw_tvlv_container_update(bat_priv); + + return count; +} + +/** + * batadv_gw_tvlv_ogm_handler_v1() - process incoming gateway tvlv container + * @bat_priv: the bat priv with all the soft interface information + * @orig: the orig_node of the ogm + * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) + * @tvlv_value: tvlv buffer containing the gateway data + * @tvlv_value_len: tvlv buffer length + */ +static void batadv_gw_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig, + u8 flags, + void *tvlv_value, u16 tvlv_value_len) +{ + struct batadv_tvlv_gateway_data gateway, *gateway_ptr; + + /* only fetch the tvlv value if the handler wasn't called via the + * CIFNOTFND flag and if there is data to fetch + */ + if (flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND || + tvlv_value_len < sizeof(gateway)) { + gateway.bandwidth_down = 0; + gateway.bandwidth_up = 0; + } else { + gateway_ptr = tvlv_value; + gateway.bandwidth_down = gateway_ptr->bandwidth_down; + gateway.bandwidth_up = gateway_ptr->bandwidth_up; + if (gateway.bandwidth_down == 0 || + gateway.bandwidth_up == 0) { + gateway.bandwidth_down = 0; + gateway.bandwidth_up = 0; + } + } + + batadv_gw_node_update(bat_priv, orig, &gateway); + + /* restart gateway selection */ + if (gateway.bandwidth_down != 0 && + atomic_read(&bat_priv->gw.mode) == BATADV_GW_MODE_CLIENT) + batadv_gw_check_election(bat_priv, orig); +} + +/** + * batadv_gw_init() - initialise the gateway handling internals + * @bat_priv: the bat priv with all the soft interface information + */ +void batadv_gw_init(struct batadv_priv *bat_priv) +{ + if (bat_priv->algo_ops->gw.init_sel_class) + bat_priv->algo_ops->gw.init_sel_class(bat_priv); + else + atomic_set(&bat_priv->gw.sel_class, 1); + + batadv_tvlv_handler_register(bat_priv, batadv_gw_tvlv_ogm_handler_v1, + NULL, BATADV_TVLV_GW, 1, + BATADV_TVLV_HANDLER_OGM_CIFNOTFND); +} + +/** + * batadv_gw_free() - free the gateway handling internals + * @bat_priv: the bat priv with all the soft interface information + */ +void batadv_gw_free(struct batadv_priv *bat_priv) +{ + batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_GW, 1); + batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_GW, 1); +} diff --git a/net/batman-adv/gateway_common.h b/net/batman-adv/gateway_common.h new file mode 100644 index 000000000..87c37f907 --- /dev/null +++ b/net/batman-adv/gateway_common.h @@ -0,0 +1,38 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner + */ + +#ifndef _NET_BATMAN_ADV_GATEWAY_COMMON_H_ +#define _NET_BATMAN_ADV_GATEWAY_COMMON_H_ + +#include "main.h" + +#include <linux/netdevice.h> +#include <linux/types.h> + +/** + * enum batadv_bandwidth_units - bandwidth unit types + */ +enum batadv_bandwidth_units { + /** @BATADV_BW_UNIT_KBIT: unit type kbit */ + BATADV_BW_UNIT_KBIT, + + /** @BATADV_BW_UNIT_MBIT: unit type mbit */ + BATADV_BW_UNIT_MBIT, +}; + +#define BATADV_GW_MODE_OFF_NAME "off" +#define BATADV_GW_MODE_CLIENT_NAME "client" +#define BATADV_GW_MODE_SERVER_NAME "server" + +ssize_t batadv_gw_bandwidth_set(struct net_device *net_dev, char *buff, + size_t count); +void batadv_gw_tvlv_container_update(struct batadv_priv *bat_priv); +void batadv_gw_init(struct batadv_priv *bat_priv); +void batadv_gw_free(struct batadv_priv *bat_priv); +bool batadv_parse_throughput(struct net_device *net_dev, char *buff, + const char *description, u32 *throughput); + +#endif /* _NET_BATMAN_ADV_GATEWAY_COMMON_H_ */ diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c new file mode 100644 index 000000000..24c9c0c3f --- /dev/null +++ b/net/batman-adv/hard-interface.c @@ -0,0 +1,1022 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + */ + +#include "hard-interface.h" +#include "main.h" + +#include <linux/atomic.h> +#include <linux/byteorder/generic.h> +#include <linux/container_of.h> +#include <linux/errno.h> +#include <linux/gfp.h> +#include <linux/if.h> +#include <linux/if_arp.h> +#include <linux/if_ether.h> +#include <linux/kref.h> +#include <linux/limits.h> +#include <linux/list.h> +#include <linux/minmax.h> +#include <linux/mutex.h> +#include <linux/netdevice.h> +#include <linux/printk.h> +#include <linux/rculist.h> +#include <linux/rtnetlink.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <net/net_namespace.h> +#include <net/rtnetlink.h> +#include <uapi/linux/batadv_packet.h> + +#include "bat_v.h" +#include "bridge_loop_avoidance.h" +#include "distributed-arp-table.h" +#include "gateway_client.h" +#include "log.h" +#include "originator.h" +#include "send.h" +#include "soft-interface.h" +#include "translation-table.h" + +/** + * batadv_hardif_release() - release hard interface from lists and queue for + * free after rcu grace period + * @ref: kref pointer of the hard interface + */ +void batadv_hardif_release(struct kref *ref) +{ + struct batadv_hard_iface *hard_iface; + + hard_iface = container_of(ref, struct batadv_hard_iface, refcount); + dev_put(hard_iface->net_dev); + + kfree_rcu(hard_iface, rcu); +} + +/** + * batadv_hardif_get_by_netdev() - Get hard interface object of a net_device + * @net_dev: net_device to search for + * + * Return: batadv_hard_iface of net_dev (with increased refcnt), NULL on errors + */ +struct batadv_hard_iface * +batadv_hardif_get_by_netdev(const struct net_device *net_dev) +{ + struct batadv_hard_iface *hard_iface; + + rcu_read_lock(); + list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { + if (hard_iface->net_dev == net_dev && + kref_get_unless_zero(&hard_iface->refcount)) + goto out; + } + + hard_iface = NULL; + +out: + rcu_read_unlock(); + return hard_iface; +} + +/** + * batadv_getlink_net() - return link net namespace (of use fallback) + * @netdev: net_device to check + * @fallback_net: return in case get_link_net is not available for @netdev + * + * Return: result of rtnl_link_ops->get_link_net or @fallback_net + */ +static struct net *batadv_getlink_net(const struct net_device *netdev, + struct net *fallback_net) +{ + if (!netdev->rtnl_link_ops) + return fallback_net; + + if (!netdev->rtnl_link_ops->get_link_net) + return fallback_net; + + return netdev->rtnl_link_ops->get_link_net(netdev); +} + +/** + * batadv_mutual_parents() - check if two devices are each others parent + * @dev1: 1st net dev + * @net1: 1st devices netns + * @dev2: 2nd net dev + * @net2: 2nd devices netns + * + * veth devices come in pairs and each is the parent of the other! + * + * Return: true if the devices are each others parent, otherwise false + */ +static bool batadv_mutual_parents(const struct net_device *dev1, + struct net *net1, + const struct net_device *dev2, + struct net *net2) +{ + int dev1_parent_iflink = dev_get_iflink(dev1); + int dev2_parent_iflink = dev_get_iflink(dev2); + const struct net *dev1_parent_net; + const struct net *dev2_parent_net; + + dev1_parent_net = batadv_getlink_net(dev1, net1); + dev2_parent_net = batadv_getlink_net(dev2, net2); + + if (!dev1_parent_iflink || !dev2_parent_iflink) + return false; + + return (dev1_parent_iflink == dev2->ifindex) && + (dev2_parent_iflink == dev1->ifindex) && + net_eq(dev1_parent_net, net2) && + net_eq(dev2_parent_net, net1); +} + +/** + * batadv_is_on_batman_iface() - check if a device is a batman iface descendant + * @net_dev: the device to check + * + * If the user creates any virtual device on top of a batman-adv interface, it + * is important to prevent this new interface from being used to create a new + * mesh network (this behaviour would lead to a batman-over-batman + * configuration). This function recursively checks all the fathers of the + * device passed as argument looking for a batman-adv soft interface. + * + * Return: true if the device is descendant of a batman-adv mesh interface (or + * if it is a batman-adv interface itself), false otherwise + */ +static bool batadv_is_on_batman_iface(const struct net_device *net_dev) +{ + struct net *net = dev_net(net_dev); + struct net_device *parent_dev; + struct net *parent_net; + int iflink; + bool ret; + + /* check if this is a batman-adv mesh interface */ + if (batadv_softif_is_valid(net_dev)) + return true; + + iflink = dev_get_iflink(net_dev); + if (iflink == 0) + return false; + + parent_net = batadv_getlink_net(net_dev, net); + + /* iflink to itself, most likely physical device */ + if (net == parent_net && iflink == net_dev->ifindex) + return false; + + /* recurse over the parent device */ + parent_dev = __dev_get_by_index((struct net *)parent_net, iflink); + if (!parent_dev) { + pr_warn("Cannot find parent device. Skipping batadv-on-batadv check for %s\n", + net_dev->name); + return false; + } + + if (batadv_mutual_parents(net_dev, net, parent_dev, parent_net)) + return false; + + ret = batadv_is_on_batman_iface(parent_dev); + + return ret; +} + +static bool batadv_is_valid_iface(const struct net_device *net_dev) +{ + if (net_dev->flags & IFF_LOOPBACK) + return false; + + if (net_dev->type != ARPHRD_ETHER) + return false; + + if (net_dev->addr_len != ETH_ALEN) + return false; + + /* no batman over batman */ + if (batadv_is_on_batman_iface(net_dev)) + return false; + + return true; +} + +/** + * batadv_get_real_netdevice() - check if the given netdev struct is a virtual + * interface on top of another 'real' interface + * @netdev: the device to check + * + * Callers must hold the rtnl semaphore. You may want batadv_get_real_netdev() + * instead of this. + * + * Return: the 'real' net device or the original net device and NULL in case + * of an error. + */ +static struct net_device *batadv_get_real_netdevice(struct net_device *netdev) +{ + struct batadv_hard_iface *hard_iface = NULL; + struct net_device *real_netdev = NULL; + struct net *real_net; + struct net *net; + int iflink; + + ASSERT_RTNL(); + + if (!netdev) + return NULL; + + iflink = dev_get_iflink(netdev); + if (iflink == 0) { + dev_hold(netdev); + return netdev; + } + + hard_iface = batadv_hardif_get_by_netdev(netdev); + if (!hard_iface || !hard_iface->soft_iface) + goto out; + + net = dev_net(hard_iface->soft_iface); + real_net = batadv_getlink_net(netdev, net); + + /* iflink to itself, most likely physical device */ + if (net == real_net && netdev->ifindex == iflink) { + real_netdev = netdev; + dev_hold(real_netdev); + goto out; + } + + real_netdev = dev_get_by_index(real_net, iflink); + +out: + batadv_hardif_put(hard_iface); + return real_netdev; +} + +/** + * batadv_get_real_netdev() - check if the given net_device struct is a virtual + * interface on top of another 'real' interface + * @net_device: the device to check + * + * Return: the 'real' net device or the original net device and NULL in case + * of an error. + */ +struct net_device *batadv_get_real_netdev(struct net_device *net_device) +{ + struct net_device *real_netdev; + + rtnl_lock(); + real_netdev = batadv_get_real_netdevice(net_device); + rtnl_unlock(); + + return real_netdev; +} + +/** + * batadv_is_wext_netdev() - check if the given net_device struct is a + * wext wifi interface + * @net_device: the device to check + * + * Return: true if the net device is a wext wireless device, false + * otherwise. + */ +static bool batadv_is_wext_netdev(struct net_device *net_device) +{ + if (!net_device) + return false; + +#ifdef CONFIG_WIRELESS_EXT + /* pre-cfg80211 drivers have to implement WEXT, so it is possible to + * check for wireless_handlers != NULL + */ + if (net_device->wireless_handlers) + return true; +#endif + + return false; +} + +/** + * batadv_is_cfg80211_netdev() - check if the given net_device struct is a + * cfg80211 wifi interface + * @net_device: the device to check + * + * Return: true if the net device is a cfg80211 wireless device, false + * otherwise. + */ +static bool batadv_is_cfg80211_netdev(struct net_device *net_device) +{ + if (!net_device) + return false; + +#if IS_ENABLED(CONFIG_CFG80211) + /* cfg80211 drivers have to set ieee80211_ptr */ + if (net_device->ieee80211_ptr) + return true; +#endif + + return false; +} + +/** + * batadv_wifi_flags_evaluate() - calculate wifi flags for net_device + * @net_device: the device to check + * + * Return: batadv_hard_iface_wifi_flags flags of the device + */ +static u32 batadv_wifi_flags_evaluate(struct net_device *net_device) +{ + u32 wifi_flags = 0; + struct net_device *real_netdev; + + if (batadv_is_wext_netdev(net_device)) + wifi_flags |= BATADV_HARDIF_WIFI_WEXT_DIRECT; + + if (batadv_is_cfg80211_netdev(net_device)) + wifi_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT; + + real_netdev = batadv_get_real_netdevice(net_device); + if (!real_netdev) + return wifi_flags; + + if (real_netdev == net_device) + goto out; + + if (batadv_is_wext_netdev(real_netdev)) + wifi_flags |= BATADV_HARDIF_WIFI_WEXT_INDIRECT; + + if (batadv_is_cfg80211_netdev(real_netdev)) + wifi_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT; + +out: + dev_put(real_netdev); + return wifi_flags; +} + +/** + * batadv_is_cfg80211_hardif() - check if the given hardif is a cfg80211 wifi + * interface + * @hard_iface: the device to check + * + * Return: true if the net device is a cfg80211 wireless device, false + * otherwise. + */ +bool batadv_is_cfg80211_hardif(struct batadv_hard_iface *hard_iface) +{ + u32 allowed_flags = 0; + + allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_DIRECT; + allowed_flags |= BATADV_HARDIF_WIFI_CFG80211_INDIRECT; + + return !!(hard_iface->wifi_flags & allowed_flags); +} + +/** + * batadv_is_wifi_hardif() - check if the given hardif is a wifi interface + * @hard_iface: the device to check + * + * Return: true if the net device is a 802.11 wireless device, false otherwise. + */ +bool batadv_is_wifi_hardif(struct batadv_hard_iface *hard_iface) +{ + if (!hard_iface) + return false; + + return hard_iface->wifi_flags != 0; +} + +/** + * batadv_hardif_no_broadcast() - check whether (re)broadcast is necessary + * @if_outgoing: the outgoing interface checked and considered for (re)broadcast + * @orig_addr: the originator of this packet + * @orig_neigh: originator address of the forwarder we just got the packet from + * (NULL if we originated) + * + * Checks whether a packet needs to be (re)broadcasted on the given interface. + * + * Return: + * BATADV_HARDIF_BCAST_NORECIPIENT: No neighbor on interface + * BATADV_HARDIF_BCAST_DUPFWD: Just one neighbor, but it is the forwarder + * BATADV_HARDIF_BCAST_DUPORIG: Just one neighbor, but it is the originator + * BATADV_HARDIF_BCAST_OK: Several neighbors, must broadcast + */ +int batadv_hardif_no_broadcast(struct batadv_hard_iface *if_outgoing, + u8 *orig_addr, u8 *orig_neigh) +{ + struct batadv_hardif_neigh_node *hardif_neigh; + struct hlist_node *first; + int ret = BATADV_HARDIF_BCAST_OK; + + rcu_read_lock(); + + /* 0 neighbors -> no (re)broadcast */ + first = rcu_dereference(hlist_first_rcu(&if_outgoing->neigh_list)); + if (!first) { + ret = BATADV_HARDIF_BCAST_NORECIPIENT; + goto out; + } + + /* >1 neighbors -> (re)broadcast */ + if (rcu_dereference(hlist_next_rcu(first))) + goto out; + + hardif_neigh = hlist_entry(first, struct batadv_hardif_neigh_node, + list); + + /* 1 neighbor, is the originator -> no rebroadcast */ + if (orig_addr && batadv_compare_eth(hardif_neigh->orig, orig_addr)) { + ret = BATADV_HARDIF_BCAST_DUPORIG; + /* 1 neighbor, is the one we received from -> no rebroadcast */ + } else if (orig_neigh && + batadv_compare_eth(hardif_neigh->orig, orig_neigh)) { + ret = BATADV_HARDIF_BCAST_DUPFWD; + } + +out: + rcu_read_unlock(); + return ret; +} + +static struct batadv_hard_iface * +batadv_hardif_get_active(const struct net_device *soft_iface) +{ + struct batadv_hard_iface *hard_iface; + + rcu_read_lock(); + list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { + if (hard_iface->soft_iface != soft_iface) + continue; + + if (hard_iface->if_status == BATADV_IF_ACTIVE && + kref_get_unless_zero(&hard_iface->refcount)) + goto out; + } + + hard_iface = NULL; + +out: + rcu_read_unlock(); + return hard_iface; +} + +static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv, + struct batadv_hard_iface *oldif) +{ + struct batadv_hard_iface *primary_if; + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + goto out; + + batadv_dat_init_own_addr(bat_priv, primary_if); + batadv_bla_update_orig_address(bat_priv, primary_if, oldif); +out: + batadv_hardif_put(primary_if); +} + +static void batadv_primary_if_select(struct batadv_priv *bat_priv, + struct batadv_hard_iface *new_hard_iface) +{ + struct batadv_hard_iface *curr_hard_iface; + + ASSERT_RTNL(); + + if (new_hard_iface) + kref_get(&new_hard_iface->refcount); + + curr_hard_iface = rcu_replace_pointer(bat_priv->primary_if, + new_hard_iface, 1); + + if (!new_hard_iface) + goto out; + + bat_priv->algo_ops->iface.primary_set(new_hard_iface); + batadv_primary_if_update_addr(bat_priv, curr_hard_iface); + +out: + batadv_hardif_put(curr_hard_iface); +} + +static bool +batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface) +{ + if (hard_iface->net_dev->flags & IFF_UP) + return true; + + return false; +} + +static void batadv_check_known_mac_addr(const struct net_device *net_dev) +{ + const struct batadv_hard_iface *hard_iface; + + rcu_read_lock(); + list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { + if (hard_iface->if_status != BATADV_IF_ACTIVE && + hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED) + continue; + + if (hard_iface->net_dev == net_dev) + continue; + + if (!batadv_compare_eth(hard_iface->net_dev->dev_addr, + net_dev->dev_addr)) + continue; + + pr_warn("The newly added mac address (%pM) already exists on: %s\n", + net_dev->dev_addr, hard_iface->net_dev->name); + pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n"); + } + rcu_read_unlock(); +} + +/** + * batadv_hardif_recalc_extra_skbroom() - Recalculate skbuff extra head/tailroom + * @soft_iface: netdev struct of the mesh interface + */ +static void batadv_hardif_recalc_extra_skbroom(struct net_device *soft_iface) +{ + const struct batadv_hard_iface *hard_iface; + unsigned short lower_header_len = ETH_HLEN; + unsigned short lower_headroom = 0; + unsigned short lower_tailroom = 0; + unsigned short needed_headroom; + + rcu_read_lock(); + list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { + if (hard_iface->if_status == BATADV_IF_NOT_IN_USE) + continue; + + if (hard_iface->soft_iface != soft_iface) + continue; + + lower_header_len = max_t(unsigned short, lower_header_len, + hard_iface->net_dev->hard_header_len); + + lower_headroom = max_t(unsigned short, lower_headroom, + hard_iface->net_dev->needed_headroom); + + lower_tailroom = max_t(unsigned short, lower_tailroom, + hard_iface->net_dev->needed_tailroom); + } + rcu_read_unlock(); + + needed_headroom = lower_headroom + (lower_header_len - ETH_HLEN); + needed_headroom += batadv_max_header_len(); + + /* fragmentation headers don't strip the unicast/... header */ + needed_headroom += sizeof(struct batadv_frag_packet); + + soft_iface->needed_headroom = needed_headroom; + soft_iface->needed_tailroom = lower_tailroom; +} + +/** + * batadv_hardif_min_mtu() - Calculate maximum MTU for soft interface + * @soft_iface: netdev struct of the soft interface + * + * Return: MTU for the soft-interface (limited by the minimal MTU of all active + * slave interfaces) + */ +int batadv_hardif_min_mtu(struct net_device *soft_iface) +{ + struct batadv_priv *bat_priv = netdev_priv(soft_iface); + const struct batadv_hard_iface *hard_iface; + int min_mtu = INT_MAX; + + rcu_read_lock(); + list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { + if (hard_iface->if_status != BATADV_IF_ACTIVE && + hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED) + continue; + + if (hard_iface->soft_iface != soft_iface) + continue; + + min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu); + } + rcu_read_unlock(); + + if (atomic_read(&bat_priv->fragmentation) == 0) + goto out; + + /* with fragmentation enabled the maximum size of internally generated + * packets such as translation table exchanges or tvlv containers, etc + * has to be calculated + */ + min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE); + min_mtu -= sizeof(struct batadv_frag_packet); + min_mtu *= BATADV_FRAG_MAX_FRAGMENTS; + +out: + /* report to the other components the maximum amount of bytes that + * batman-adv can send over the wire (without considering the payload + * overhead). For example, this value is used by TT to compute the + * maximum local table size + */ + atomic_set(&bat_priv->packet_size_max, min_mtu); + + /* the real soft-interface MTU is computed by removing the payload + * overhead from the maximum amount of bytes that was just computed. + * + * However batman-adv does not support MTUs bigger than ETH_DATA_LEN + */ + return min_t(int, min_mtu - batadv_max_header_len(), ETH_DATA_LEN); +} + +/** + * batadv_update_min_mtu() - Adjusts the MTU if a new interface with a smaller + * MTU appeared + * @soft_iface: netdev struct of the soft interface + */ +void batadv_update_min_mtu(struct net_device *soft_iface) +{ + struct batadv_priv *bat_priv = netdev_priv(soft_iface); + int limit_mtu; + int mtu; + + mtu = batadv_hardif_min_mtu(soft_iface); + + if (bat_priv->mtu_set_by_user) + limit_mtu = bat_priv->mtu_set_by_user; + else + limit_mtu = ETH_DATA_LEN; + + mtu = min(mtu, limit_mtu); + dev_set_mtu(soft_iface, mtu); + + /* Check if the local translate table should be cleaned up to match a + * new (and smaller) MTU. + */ + batadv_tt_local_resize_to_mtu(soft_iface); +} + +static void +batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface) +{ + struct batadv_priv *bat_priv; + struct batadv_hard_iface *primary_if = NULL; + + if (hard_iface->if_status != BATADV_IF_INACTIVE) + goto out; + + bat_priv = netdev_priv(hard_iface->soft_iface); + + bat_priv->algo_ops->iface.update_mac(hard_iface); + hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED; + + /* the first active interface becomes our primary interface or + * the next active interface after the old primary interface was removed + */ + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + batadv_primary_if_select(bat_priv, hard_iface); + + batadv_info(hard_iface->soft_iface, "Interface activated: %s\n", + hard_iface->net_dev->name); + + batadv_update_min_mtu(hard_iface->soft_iface); + + if (bat_priv->algo_ops->iface.activate) + bat_priv->algo_ops->iface.activate(hard_iface); + +out: + batadv_hardif_put(primary_if); +} + +static void +batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface) +{ + if (hard_iface->if_status != BATADV_IF_ACTIVE && + hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED) + return; + + hard_iface->if_status = BATADV_IF_INACTIVE; + + batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n", + hard_iface->net_dev->name); + + batadv_update_min_mtu(hard_iface->soft_iface); +} + +/** + * batadv_hardif_enable_interface() - Enslave hard interface to soft interface + * @hard_iface: hard interface to add to soft interface + * @soft_iface: netdev struct of the mesh interface + * + * Return: 0 on success or negative error number in case of failure + */ +int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, + struct net_device *soft_iface) +{ + struct batadv_priv *bat_priv; + __be16 ethertype = htons(ETH_P_BATMAN); + int max_header_len = batadv_max_header_len(); + int ret; + + if (hard_iface->net_dev->mtu < ETH_MIN_MTU + max_header_len) + return -EINVAL; + + if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) + goto out; + + kref_get(&hard_iface->refcount); + + dev_hold(soft_iface); + hard_iface->soft_iface = soft_iface; + bat_priv = netdev_priv(hard_iface->soft_iface); + + ret = netdev_master_upper_dev_link(hard_iface->net_dev, + soft_iface, NULL, NULL, NULL); + if (ret) + goto err_dev; + + ret = bat_priv->algo_ops->iface.enable(hard_iface); + if (ret < 0) + goto err_upper; + + hard_iface->if_status = BATADV_IF_INACTIVE; + + kref_get(&hard_iface->refcount); + hard_iface->batman_adv_ptype.type = ethertype; + hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv; + hard_iface->batman_adv_ptype.dev = hard_iface->net_dev; + dev_add_pack(&hard_iface->batman_adv_ptype); + + batadv_info(hard_iface->soft_iface, "Adding interface: %s\n", + hard_iface->net_dev->name); + + if (atomic_read(&bat_priv->fragmentation) && + hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len) + batadv_info(hard_iface->soft_iface, + "The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to %i would solve the problem.\n", + hard_iface->net_dev->name, hard_iface->net_dev->mtu, + ETH_DATA_LEN + max_header_len); + + if (!atomic_read(&bat_priv->fragmentation) && + hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len) + batadv_info(hard_iface->soft_iface, + "The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. If you experience problems getting traffic through try increasing the MTU to %i.\n", + hard_iface->net_dev->name, hard_iface->net_dev->mtu, + ETH_DATA_LEN + max_header_len); + + if (batadv_hardif_is_iface_up(hard_iface)) + batadv_hardif_activate_interface(hard_iface); + else + batadv_err(hard_iface->soft_iface, + "Not using interface %s (retrying later): interface not active\n", + hard_iface->net_dev->name); + + batadv_hardif_recalc_extra_skbroom(soft_iface); + + if (bat_priv->algo_ops->iface.enabled) + bat_priv->algo_ops->iface.enabled(hard_iface); + +out: + return 0; + +err_upper: + netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface); +err_dev: + hard_iface->soft_iface = NULL; + dev_put(soft_iface); + batadv_hardif_put(hard_iface); + return ret; +} + +/** + * batadv_hardif_cnt() - get number of interfaces enslaved to soft interface + * @soft_iface: soft interface to check + * + * This function is only using RCU for locking - the result can therefore be + * off when another function is modifying the list at the same time. The + * caller can use the rtnl_lock to make sure that the count is accurate. + * + * Return: number of connected/enslaved hard interfaces + */ +static size_t batadv_hardif_cnt(const struct net_device *soft_iface) +{ + struct batadv_hard_iface *hard_iface; + size_t count = 0; + + rcu_read_lock(); + list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { + if (hard_iface->soft_iface != soft_iface) + continue; + + count++; + } + rcu_read_unlock(); + + return count; +} + +/** + * batadv_hardif_disable_interface() - Remove hard interface from soft interface + * @hard_iface: hard interface to be removed + */ +void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface) +{ + struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); + struct batadv_hard_iface *primary_if = NULL; + + batadv_hardif_deactivate_interface(hard_iface); + + if (hard_iface->if_status != BATADV_IF_INACTIVE) + goto out; + + batadv_info(hard_iface->soft_iface, "Removing interface: %s\n", + hard_iface->net_dev->name); + dev_remove_pack(&hard_iface->batman_adv_ptype); + batadv_hardif_put(hard_iface); + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (hard_iface == primary_if) { + struct batadv_hard_iface *new_if; + + new_if = batadv_hardif_get_active(hard_iface->soft_iface); + batadv_primary_if_select(bat_priv, new_if); + + batadv_hardif_put(new_if); + } + + bat_priv->algo_ops->iface.disable(hard_iface); + hard_iface->if_status = BATADV_IF_NOT_IN_USE; + + /* delete all references to this hard_iface */ + batadv_purge_orig_ref(bat_priv); + batadv_purge_outstanding_packets(bat_priv, hard_iface); + dev_put(hard_iface->soft_iface); + + netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface); + batadv_hardif_recalc_extra_skbroom(hard_iface->soft_iface); + + /* nobody uses this interface anymore */ + if (batadv_hardif_cnt(hard_iface->soft_iface) <= 1) + batadv_gw_check_client_stop(bat_priv); + + hard_iface->soft_iface = NULL; + batadv_hardif_put(hard_iface); + +out: + batadv_hardif_put(primary_if); +} + +static struct batadv_hard_iface * +batadv_hardif_add_interface(struct net_device *net_dev) +{ + struct batadv_hard_iface *hard_iface; + + ASSERT_RTNL(); + + if (!batadv_is_valid_iface(net_dev)) + goto out; + + dev_hold(net_dev); + + hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC); + if (!hard_iface) + goto release_dev; + + hard_iface->net_dev = net_dev; + hard_iface->soft_iface = NULL; + hard_iface->if_status = BATADV_IF_NOT_IN_USE; + + INIT_LIST_HEAD(&hard_iface->list); + INIT_HLIST_HEAD(&hard_iface->neigh_list); + + mutex_init(&hard_iface->bat_iv.ogm_buff_mutex); + spin_lock_init(&hard_iface->neigh_list_lock); + kref_init(&hard_iface->refcount); + + hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT; + hard_iface->wifi_flags = batadv_wifi_flags_evaluate(net_dev); + if (batadv_is_wifi_hardif(hard_iface)) + hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS; + + atomic_set(&hard_iface->hop_penalty, 0); + + batadv_v_hardif_init(hard_iface); + + batadv_check_known_mac_addr(hard_iface->net_dev); + kref_get(&hard_iface->refcount); + list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list); + batadv_hardif_generation++; + + return hard_iface; + +release_dev: + dev_put(net_dev); +out: + return NULL; +} + +static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface) +{ + ASSERT_RTNL(); + + /* first deactivate interface */ + if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) + batadv_hardif_disable_interface(hard_iface); + + if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) + return; + + hard_iface->if_status = BATADV_IF_TO_BE_REMOVED; + batadv_hardif_put(hard_iface); +} + +/** + * batadv_hard_if_event_softif() - Handle events for soft interfaces + * @event: NETDEV_* event to handle + * @net_dev: net_device which generated an event + * + * Return: NOTIFY_* result + */ +static int batadv_hard_if_event_softif(unsigned long event, + struct net_device *net_dev) +{ + struct batadv_priv *bat_priv; + + switch (event) { + case NETDEV_REGISTER: + bat_priv = netdev_priv(net_dev); + batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS); + break; + } + + return NOTIFY_DONE; +} + +static int batadv_hard_if_event(struct notifier_block *this, + unsigned long event, void *ptr) +{ + struct net_device *net_dev = netdev_notifier_info_to_dev(ptr); + struct batadv_hard_iface *hard_iface; + struct batadv_hard_iface *primary_if = NULL; + struct batadv_priv *bat_priv; + + if (batadv_softif_is_valid(net_dev)) + return batadv_hard_if_event_softif(event, net_dev); + + hard_iface = batadv_hardif_get_by_netdev(net_dev); + if (!hard_iface && (event == NETDEV_REGISTER || + event == NETDEV_POST_TYPE_CHANGE)) + hard_iface = batadv_hardif_add_interface(net_dev); + + if (!hard_iface) + goto out; + + switch (event) { + case NETDEV_UP: + batadv_hardif_activate_interface(hard_iface); + break; + case NETDEV_GOING_DOWN: + case NETDEV_DOWN: + batadv_hardif_deactivate_interface(hard_iface); + break; + case NETDEV_UNREGISTER: + case NETDEV_PRE_TYPE_CHANGE: + list_del_rcu(&hard_iface->list); + batadv_hardif_generation++; + + batadv_hardif_remove_interface(hard_iface); + break; + case NETDEV_CHANGEMTU: + if (hard_iface->soft_iface) + batadv_update_min_mtu(hard_iface->soft_iface); + break; + case NETDEV_CHANGEADDR: + if (hard_iface->if_status == BATADV_IF_NOT_IN_USE) + goto hardif_put; + + batadv_check_known_mac_addr(hard_iface->net_dev); + + bat_priv = netdev_priv(hard_iface->soft_iface); + bat_priv->algo_ops->iface.update_mac(hard_iface); + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + goto hardif_put; + + if (hard_iface == primary_if) + batadv_primary_if_update_addr(bat_priv, NULL); + break; + case NETDEV_CHANGEUPPER: + hard_iface->wifi_flags = batadv_wifi_flags_evaluate(net_dev); + if (batadv_is_wifi_hardif(hard_iface)) + hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS; + break; + default: + break; + } + +hardif_put: + batadv_hardif_put(hard_iface); +out: + batadv_hardif_put(primary_if); + return NOTIFY_DONE; +} + +struct notifier_block batadv_hard_if_notifier = { + .notifier_call = batadv_hard_if_event, +}; diff --git a/net/batman-adv/hard-interface.h b/net/batman-adv/hard-interface.h new file mode 100644 index 000000000..64f660dbb --- /dev/null +++ b/net/batman-adv/hard-interface.h @@ -0,0 +1,122 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + */ + +#ifndef _NET_BATMAN_ADV_HARD_INTERFACE_H_ +#define _NET_BATMAN_ADV_HARD_INTERFACE_H_ + +#include "main.h" + +#include <linux/compiler.h> +#include <linux/kref.h> +#include <linux/netdevice.h> +#include <linux/notifier.h> +#include <linux/rcupdate.h> +#include <linux/stddef.h> +#include <linux/types.h> + +/** + * enum batadv_hard_if_state - State of a hard interface + */ +enum batadv_hard_if_state { + /** + * @BATADV_IF_NOT_IN_USE: interface is not used as slave interface of a + * batman-adv soft interface + */ + BATADV_IF_NOT_IN_USE, + + /** + * @BATADV_IF_TO_BE_REMOVED: interface will be removed from soft + * interface + */ + BATADV_IF_TO_BE_REMOVED, + + /** @BATADV_IF_INACTIVE: interface is deactivated */ + BATADV_IF_INACTIVE, + + /** @BATADV_IF_ACTIVE: interface is used */ + BATADV_IF_ACTIVE, + + /** @BATADV_IF_TO_BE_ACTIVATED: interface is getting activated */ + BATADV_IF_TO_BE_ACTIVATED, +}; + +/** + * enum batadv_hard_if_bcast - broadcast avoidance options + */ +enum batadv_hard_if_bcast { + /** @BATADV_HARDIF_BCAST_OK: Do broadcast on according hard interface */ + BATADV_HARDIF_BCAST_OK = 0, + + /** + * @BATADV_HARDIF_BCAST_NORECIPIENT: Broadcast not needed, there is no + * recipient + */ + BATADV_HARDIF_BCAST_NORECIPIENT, + + /** + * @BATADV_HARDIF_BCAST_DUPFWD: There is just the neighbor we got it + * from + */ + BATADV_HARDIF_BCAST_DUPFWD, + + /** @BATADV_HARDIF_BCAST_DUPORIG: There is just the originator */ + BATADV_HARDIF_BCAST_DUPORIG, +}; + +extern struct notifier_block batadv_hard_if_notifier; + +struct net_device *batadv_get_real_netdev(struct net_device *net_device); +bool batadv_is_cfg80211_hardif(struct batadv_hard_iface *hard_iface); +bool batadv_is_wifi_hardif(struct batadv_hard_iface *hard_iface); +struct batadv_hard_iface* +batadv_hardif_get_by_netdev(const struct net_device *net_dev); +int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, + struct net_device *soft_iface); +void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface); +int batadv_hardif_min_mtu(struct net_device *soft_iface); +void batadv_update_min_mtu(struct net_device *soft_iface); +void batadv_hardif_release(struct kref *ref); +int batadv_hardif_no_broadcast(struct batadv_hard_iface *if_outgoing, + u8 *orig_addr, u8 *orig_neigh); + +/** + * batadv_hardif_put() - decrement the hard interface refcounter and possibly + * release it + * @hard_iface: the hard interface to free + */ +static inline void batadv_hardif_put(struct batadv_hard_iface *hard_iface) +{ + if (!hard_iface) + return; + + kref_put(&hard_iface->refcount, batadv_hardif_release); +} + +/** + * batadv_primary_if_get_selected() - Get reference to primary interface + * @bat_priv: the bat priv with all the soft interface information + * + * Return: primary interface (with increased refcnt), otherwise NULL + */ +static inline struct batadv_hard_iface * +batadv_primary_if_get_selected(struct batadv_priv *bat_priv) +{ + struct batadv_hard_iface *hard_iface; + + rcu_read_lock(); + hard_iface = rcu_dereference(bat_priv->primary_if); + if (!hard_iface) + goto out; + + if (!kref_get_unless_zero(&hard_iface->refcount)) + hard_iface = NULL; + +out: + rcu_read_unlock(); + return hard_iface; +} + +#endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */ diff --git a/net/batman-adv/hash.c b/net/batman-adv/hash.c new file mode 100644 index 000000000..8016e6197 --- /dev/null +++ b/net/batman-adv/hash.c @@ -0,0 +1,84 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Simon Wunderlich, Marek Lindner + */ + +#include "hash.h" +#include "main.h" + +#include <linux/gfp.h> +#include <linux/lockdep.h> +#include <linux/slab.h> + +/* clears the hash */ +static void batadv_hash_init(struct batadv_hashtable *hash) +{ + u32 i; + + for (i = 0; i < hash->size; i++) { + INIT_HLIST_HEAD(&hash->table[i]); + spin_lock_init(&hash->list_locks[i]); + } + + atomic_set(&hash->generation, 0); +} + +/** + * batadv_hash_destroy() - Free only the hashtable and the hash itself + * @hash: hash object to destroy + */ +void batadv_hash_destroy(struct batadv_hashtable *hash) +{ + kfree(hash->list_locks); + kfree(hash->table); + kfree(hash); +} + +/** + * batadv_hash_new() - Allocates and clears the hashtable + * @size: number of hash buckets to allocate + * + * Return: newly allocated hashtable, NULL on errors + */ +struct batadv_hashtable *batadv_hash_new(u32 size) +{ + struct batadv_hashtable *hash; + + hash = kmalloc(sizeof(*hash), GFP_ATOMIC); + if (!hash) + return NULL; + + hash->table = kmalloc_array(size, sizeof(*hash->table), GFP_ATOMIC); + if (!hash->table) + goto free_hash; + + hash->list_locks = kmalloc_array(size, sizeof(*hash->list_locks), + GFP_ATOMIC); + if (!hash->list_locks) + goto free_table; + + hash->size = size; + batadv_hash_init(hash); + return hash; + +free_table: + kfree(hash->table); +free_hash: + kfree(hash); + return NULL; +} + +/** + * batadv_hash_set_lock_class() - Set specific lockdep class for hash spinlocks + * @hash: hash object to modify + * @key: lockdep class key address + */ +void batadv_hash_set_lock_class(struct batadv_hashtable *hash, + struct lock_class_key *key) +{ + u32 i; + + for (i = 0; i < hash->size; i++) + lockdep_set_class(&hash->list_locks[i], key); +} diff --git a/net/batman-adv/hash.h b/net/batman-adv/hash.h new file mode 100644 index 000000000..fb251c385 --- /dev/null +++ b/net/batman-adv/hash.h @@ -0,0 +1,157 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Simon Wunderlich, Marek Lindner + */ + +#ifndef _NET_BATMAN_ADV_HASH_H_ +#define _NET_BATMAN_ADV_HASH_H_ + +#include "main.h" + +#include <linux/atomic.h> +#include <linux/compiler.h> +#include <linux/list.h> +#include <linux/lockdep.h> +#include <linux/rculist.h> +#include <linux/spinlock.h> +#include <linux/stddef.h> +#include <linux/types.h> + +/* callback to a compare function. should compare 2 element data for their + * keys + * + * Return: true if same and false if not same + */ +typedef bool (*batadv_hashdata_compare_cb)(const struct hlist_node *, + const void *); + +/* the hashfunction + * + * Return: an index based on the key in the data of the first argument and the + * size the second + */ +typedef u32 (*batadv_hashdata_choose_cb)(const void *, u32); +typedef void (*batadv_hashdata_free_cb)(struct hlist_node *, void *); + +/** + * struct batadv_hashtable - Wrapper of simple hlist based hashtable + */ +struct batadv_hashtable { + /** @table: the hashtable itself with the buckets */ + struct hlist_head *table; + + /** @list_locks: spinlock for each hash list entry */ + spinlock_t *list_locks; + + /** @size: size of hashtable */ + u32 size; + + /** @generation: current (generation) sequence number */ + atomic_t generation; +}; + +/* allocates and clears the hash */ +struct batadv_hashtable *batadv_hash_new(u32 size); + +/* set class key for all locks */ +void batadv_hash_set_lock_class(struct batadv_hashtable *hash, + struct lock_class_key *key); + +/* free only the hashtable and the hash itself. */ +void batadv_hash_destroy(struct batadv_hashtable *hash); + +/** + * batadv_hash_add() - adds data to the hashtable + * @hash: storage hash table + * @compare: callback to determine if 2 hash elements are identical + * @choose: callback calculating the hash index + * @data: data passed to the aforementioned callbacks as argument + * @data_node: to be added element + * + * Return: 0 on success, 1 if the element already is in the hash + * and -1 on error. + */ +static inline int batadv_hash_add(struct batadv_hashtable *hash, + batadv_hashdata_compare_cb compare, + batadv_hashdata_choose_cb choose, + const void *data, + struct hlist_node *data_node) +{ + u32 index; + int ret = -1; + struct hlist_head *head; + struct hlist_node *node; + spinlock_t *list_lock; /* spinlock to protect write access */ + + if (!hash) + goto out; + + index = choose(data, hash->size); + head = &hash->table[index]; + list_lock = &hash->list_locks[index]; + + spin_lock_bh(list_lock); + + hlist_for_each(node, head) { + if (!compare(node, data)) + continue; + + ret = 1; + goto unlock; + } + + /* no duplicate found in list, add new element */ + hlist_add_head_rcu(data_node, head); + atomic_inc(&hash->generation); + + ret = 0; + +unlock: + spin_unlock_bh(list_lock); +out: + return ret; +} + +/** + * batadv_hash_remove() - Removes data from hash, if found + * @hash: hash table + * @compare: callback to determine if 2 hash elements are identical + * @choose: callback calculating the hash index + * @data: data passed to the aforementioned callbacks as argument + * + * ata could be the structure you use with just the key filled, we just need + * the key for comparing. + * + * Return: returns pointer do data on success, so you can remove the used + * structure yourself, or NULL on error + */ +static inline void *batadv_hash_remove(struct batadv_hashtable *hash, + batadv_hashdata_compare_cb compare, + batadv_hashdata_choose_cb choose, + void *data) +{ + u32 index; + struct hlist_node *node; + struct hlist_head *head; + void *data_save = NULL; + + index = choose(data, hash->size); + head = &hash->table[index]; + + spin_lock_bh(&hash->list_locks[index]); + hlist_for_each(node, head) { + if (!compare(node, data)) + continue; + + data_save = node; + hlist_del_rcu(node); + atomic_inc(&hash->generation); + break; + } + spin_unlock_bh(&hash->list_locks[index]); + + return data_save; +} + +#endif /* _NET_BATMAN_ADV_HASH_H_ */ diff --git a/net/batman-adv/log.c b/net/batman-adv/log.c new file mode 100644 index 000000000..7a93a1e94 --- /dev/null +++ b/net/batman-adv/log.c @@ -0,0 +1,36 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner + */ + +#include "log.h" +#include "main.h" + +#include <linux/stdarg.h> + +#include "trace.h" + +/** + * batadv_debug_log() - Add debug log entry + * @bat_priv: the bat priv with all the soft interface information + * @fmt: format string + * + * Return: 0 on success or negative error number in case of failure + */ +int batadv_debug_log(struct batadv_priv *bat_priv, const char *fmt, ...) +{ + struct va_format vaf; + va_list args; + + va_start(args, fmt); + + vaf.fmt = fmt; + vaf.va = &args; + + trace_batadv_dbg(bat_priv, &vaf); + + va_end(args); + + return 0; +} diff --git a/net/batman-adv/log.h b/net/batman-adv/log.h new file mode 100644 index 000000000..6717c965f --- /dev/null +++ b/net/batman-adv/log.h @@ -0,0 +1,143 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + */ + +#ifndef _NET_BATMAN_ADV_LOG_H_ +#define _NET_BATMAN_ADV_LOG_H_ + +#include "main.h" + +#include <linux/atomic.h> +#include <linux/bitops.h> +#include <linux/compiler.h> +#include <linux/printk.h> + +#ifdef CONFIG_BATMAN_ADV_DEBUG + +int batadv_debug_log_setup(struct batadv_priv *bat_priv); +void batadv_debug_log_cleanup(struct batadv_priv *bat_priv); + +#else + +static inline int batadv_debug_log_setup(struct batadv_priv *bat_priv) +{ + return 0; +} + +static inline void batadv_debug_log_cleanup(struct batadv_priv *bat_priv) +{ +} + +#endif + +/** + * enum batadv_dbg_level - available log levels + */ +enum batadv_dbg_level { + /** @BATADV_DBG_BATMAN: OGM and TQ computations related messages */ + BATADV_DBG_BATMAN = BIT(0), + + /** @BATADV_DBG_ROUTES: route added / changed / deleted */ + BATADV_DBG_ROUTES = BIT(1), + + /** @BATADV_DBG_TT: translation table messages */ + BATADV_DBG_TT = BIT(2), + + /** @BATADV_DBG_BLA: bridge loop avoidance messages */ + BATADV_DBG_BLA = BIT(3), + + /** @BATADV_DBG_DAT: ARP snooping and DAT related messages */ + BATADV_DBG_DAT = BIT(4), + + /** @BATADV_DBG_NC: network coding related messages */ + BATADV_DBG_NC = BIT(5), + + /** @BATADV_DBG_MCAST: multicast related messages */ + BATADV_DBG_MCAST = BIT(6), + + /** @BATADV_DBG_TP_METER: throughput meter messages */ + BATADV_DBG_TP_METER = BIT(7), + + /** @BATADV_DBG_ALL: the union of all the above log levels */ + BATADV_DBG_ALL = 255, +}; + +#ifdef CONFIG_BATMAN_ADV_DEBUG +int batadv_debug_log(struct batadv_priv *bat_priv, const char *fmt, ...) +__printf(2, 3); + +/** + * _batadv_dbg() - Store debug output with(out) rate limiting + * @type: type of debug message + * @bat_priv: the bat priv with all the soft interface information + * @ratelimited: whether output should be rate limited + * @fmt: format string + * @arg: variable arguments + */ +#define _batadv_dbg(type, bat_priv, ratelimited, fmt, arg...) \ + do { \ + struct batadv_priv *__batpriv = (bat_priv); \ + if (atomic_read(&__batpriv->log_level) & (type) && \ + (!(ratelimited) || net_ratelimit())) \ + batadv_debug_log(__batpriv, fmt, ## arg); \ + } \ + while (0) +#else /* !CONFIG_BATMAN_ADV_DEBUG */ +__printf(4, 5) +static inline void _batadv_dbg(int type __always_unused, + struct batadv_priv *bat_priv __always_unused, + int ratelimited __always_unused, + const char *fmt __always_unused, ...) +{ +} +#endif + +/** + * batadv_dbg() - Store debug output without rate limiting + * @type: type of debug message + * @bat_priv: the bat priv with all the soft interface information + * @arg: format string and variable arguments + */ +#define batadv_dbg(type, bat_priv, arg...) \ + _batadv_dbg(type, bat_priv, 0, ## arg) + +/** + * batadv_dbg_ratelimited() - Store debug output with rate limiting + * @type: type of debug message + * @bat_priv: the bat priv with all the soft interface information + * @arg: format string and variable arguments + */ +#define batadv_dbg_ratelimited(type, bat_priv, arg...) \ + _batadv_dbg(type, bat_priv, 1, ## arg) + +/** + * batadv_info() - Store message in debug buffer and print it to kmsg buffer + * @net_dev: the soft interface net device + * @fmt: format string + * @arg: variable arguments + */ +#define batadv_info(net_dev, fmt, arg...) \ + do { \ + struct net_device *_netdev = (net_dev); \ + struct batadv_priv *_batpriv = netdev_priv(_netdev); \ + batadv_dbg(BATADV_DBG_ALL, _batpriv, fmt, ## arg); \ + pr_info("%s: " fmt, _netdev->name, ## arg); \ + } while (0) + +/** + * batadv_err() - Store error in debug buffer and print it to kmsg buffer + * @net_dev: the soft interface net device + * @fmt: format string + * @arg: variable arguments + */ +#define batadv_err(net_dev, fmt, arg...) \ + do { \ + struct net_device *_netdev = (net_dev); \ + struct batadv_priv *_batpriv = netdev_priv(_netdev); \ + batadv_dbg(BATADV_DBG_ALL, _batpriv, fmt, ## arg); \ + pr_err("%s: " fmt, _netdev->name, ## arg); \ + } while (0) + +#endif /* _NET_BATMAN_ADV_LOG_H_ */ diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c new file mode 100644 index 000000000..e8a449915 --- /dev/null +++ b/net/batman-adv/main.c @@ -0,0 +1,731 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + */ + +#include "main.h" + +#include <linux/atomic.h> +#include <linux/build_bug.h> +#include <linux/byteorder/generic.h> +#include <linux/container_of.h> +#include <linux/crc32c.h> +#include <linux/device.h> +#include <linux/errno.h> +#include <linux/genetlink.h> +#include <linux/gfp.h> +#include <linux/if_ether.h> +#include <linux/if_vlan.h> +#include <linux/init.h> +#include <linux/ip.h> +#include <linux/ipv6.h> +#include <linux/kernel.h> +#include <linux/kobject.h> +#include <linux/kref.h> +#include <linux/list.h> +#include <linux/minmax.h> +#include <linux/module.h> +#include <linux/netdevice.h> +#include <linux/printk.h> +#include <linux/rculist.h> +#include <linux/rcupdate.h> +#include <linux/skbuff.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/stddef.h> +#include <linux/string.h> +#include <linux/workqueue.h> +#include <net/dsfield.h> +#include <net/rtnetlink.h> +#include <uapi/linux/batadv_packet.h> +#include <uapi/linux/batman_adv.h> + +#include "bat_algo.h" +#include "bat_iv_ogm.h" +#include "bat_v.h" +#include "bridge_loop_avoidance.h" +#include "distributed-arp-table.h" +#include "gateway_client.h" +#include "gateway_common.h" +#include "hard-interface.h" +#include "log.h" +#include "multicast.h" +#include "netlink.h" +#include "network-coding.h" +#include "originator.h" +#include "routing.h" +#include "send.h" +#include "soft-interface.h" +#include "tp_meter.h" +#include "translation-table.h" + +/* List manipulations on hardif_list have to be rtnl_lock()'ed, + * list traversals just rcu-locked + */ +struct list_head batadv_hardif_list; +unsigned int batadv_hardif_generation; +static int (*batadv_rx_handler[256])(struct sk_buff *skb, + struct batadv_hard_iface *recv_if); + +unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; + +struct workqueue_struct *batadv_event_workqueue; + +static void batadv_recv_handler_init(void); + +#define BATADV_UEV_TYPE_VAR "BATTYPE=" +#define BATADV_UEV_ACTION_VAR "BATACTION=" +#define BATADV_UEV_DATA_VAR "BATDATA=" + +static char *batadv_uev_action_str[] = { + "add", + "del", + "change", + "loopdetect", +}; + +static char *batadv_uev_type_str[] = { + "gw", + "bla", +}; + +static int __init batadv_init(void) +{ + int ret; + + ret = batadv_tt_cache_init(); + if (ret < 0) + return ret; + + INIT_LIST_HEAD(&batadv_hardif_list); + batadv_algo_init(); + + batadv_recv_handler_init(); + + batadv_v_init(); + batadv_iv_init(); + batadv_nc_init(); + batadv_tp_meter_init(); + + batadv_event_workqueue = create_singlethread_workqueue("bat_events"); + if (!batadv_event_workqueue) + goto err_create_wq; + + register_netdevice_notifier(&batadv_hard_if_notifier); + rtnl_link_register(&batadv_link_ops); + batadv_netlink_register(); + + pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n", + BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION); + + return 0; + +err_create_wq: + batadv_tt_cache_destroy(); + + return -ENOMEM; +} + +static void __exit batadv_exit(void) +{ + batadv_netlink_unregister(); + rtnl_link_unregister(&batadv_link_ops); + unregister_netdevice_notifier(&batadv_hard_if_notifier); + + destroy_workqueue(batadv_event_workqueue); + batadv_event_workqueue = NULL; + + rcu_barrier(); + + batadv_tt_cache_destroy(); +} + +/** + * batadv_mesh_init() - Initialize soft interface + * @soft_iface: netdev struct of the soft interface + * + * Return: 0 on success or negative error number in case of failure + */ +int batadv_mesh_init(struct net_device *soft_iface) +{ + struct batadv_priv *bat_priv = netdev_priv(soft_iface); + int ret; + + spin_lock_init(&bat_priv->forw_bat_list_lock); + spin_lock_init(&bat_priv->forw_bcast_list_lock); + spin_lock_init(&bat_priv->tt.changes_list_lock); + spin_lock_init(&bat_priv->tt.req_list_lock); + spin_lock_init(&bat_priv->tt.roam_list_lock); + spin_lock_init(&bat_priv->tt.last_changeset_lock); + spin_lock_init(&bat_priv->tt.commit_lock); + spin_lock_init(&bat_priv->gw.list_lock); +#ifdef CONFIG_BATMAN_ADV_MCAST + spin_lock_init(&bat_priv->mcast.mla_lock); + spin_lock_init(&bat_priv->mcast.want_lists_lock); +#endif + spin_lock_init(&bat_priv->tvlv.container_list_lock); + spin_lock_init(&bat_priv->tvlv.handler_list_lock); + spin_lock_init(&bat_priv->softif_vlan_list_lock); + spin_lock_init(&bat_priv->tp_list_lock); + + INIT_HLIST_HEAD(&bat_priv->forw_bat_list); + INIT_HLIST_HEAD(&bat_priv->forw_bcast_list); + INIT_HLIST_HEAD(&bat_priv->gw.gateway_list); +#ifdef CONFIG_BATMAN_ADV_MCAST + INIT_HLIST_HEAD(&bat_priv->mcast.want_all_unsnoopables_list); + INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv4_list); + INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv6_list); +#endif + INIT_LIST_HEAD(&bat_priv->tt.changes_list); + INIT_HLIST_HEAD(&bat_priv->tt.req_list); + INIT_LIST_HEAD(&bat_priv->tt.roam_list); +#ifdef CONFIG_BATMAN_ADV_MCAST + INIT_HLIST_HEAD(&bat_priv->mcast.mla_list); +#endif + INIT_HLIST_HEAD(&bat_priv->tvlv.container_list); + INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list); + INIT_HLIST_HEAD(&bat_priv->softif_vlan_list); + INIT_HLIST_HEAD(&bat_priv->tp_list); + + bat_priv->gw.generation = 0; + + ret = batadv_originator_init(bat_priv); + if (ret < 0) { + atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); + goto err_orig; + } + + ret = batadv_tt_init(bat_priv); + if (ret < 0) { + atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); + goto err_tt; + } + + ret = batadv_v_mesh_init(bat_priv); + if (ret < 0) { + atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); + goto err_v; + } + + ret = batadv_bla_init(bat_priv); + if (ret < 0) { + atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); + goto err_bla; + } + + ret = batadv_dat_init(bat_priv); + if (ret < 0) { + atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); + goto err_dat; + } + + ret = batadv_nc_mesh_init(bat_priv); + if (ret < 0) { + atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); + goto err_nc; + } + + batadv_gw_init(bat_priv); + batadv_mcast_init(bat_priv); + + atomic_set(&bat_priv->gw.reselect, 0); + atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE); + + return 0; + +err_nc: + batadv_dat_free(bat_priv); +err_dat: + batadv_bla_free(bat_priv); +err_bla: + batadv_v_mesh_free(bat_priv); +err_v: + batadv_tt_free(bat_priv); +err_tt: + batadv_originator_free(bat_priv); +err_orig: + batadv_purge_outstanding_packets(bat_priv, NULL); + atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); + + return ret; +} + +/** + * batadv_mesh_free() - Deinitialize soft interface + * @soft_iface: netdev struct of the soft interface + */ +void batadv_mesh_free(struct net_device *soft_iface) +{ + struct batadv_priv *bat_priv = netdev_priv(soft_iface); + + atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING); + + batadv_purge_outstanding_packets(bat_priv, NULL); + + batadv_gw_node_free(bat_priv); + + batadv_v_mesh_free(bat_priv); + batadv_nc_mesh_free(bat_priv); + batadv_dat_free(bat_priv); + batadv_bla_free(bat_priv); + + batadv_mcast_free(bat_priv); + + /* Free the TT and the originator tables only after having terminated + * all the other depending components which may use these structures for + * their purposes. + */ + batadv_tt_free(bat_priv); + + /* Since the originator table clean up routine is accessing the TT + * tables as well, it has to be invoked after the TT tables have been + * freed and marked as empty. This ensures that no cleanup RCU callbacks + * accessing the TT data are scheduled for later execution. + */ + batadv_originator_free(bat_priv); + + batadv_gw_free(bat_priv); + + free_percpu(bat_priv->bat_counters); + bat_priv->bat_counters = NULL; + + atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); +} + +/** + * batadv_is_my_mac() - check if the given mac address belongs to any of the + * real interfaces in the current mesh + * @bat_priv: the bat priv with all the soft interface information + * @addr: the address to check + * + * Return: 'true' if the mac address was found, false otherwise. + */ +bool batadv_is_my_mac(struct batadv_priv *bat_priv, const u8 *addr) +{ + const struct batadv_hard_iface *hard_iface; + bool is_my_mac = false; + + rcu_read_lock(); + list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { + if (hard_iface->if_status != BATADV_IF_ACTIVE) + continue; + + if (hard_iface->soft_iface != bat_priv->soft_iface) + continue; + + if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) { + is_my_mac = true; + break; + } + } + rcu_read_unlock(); + return is_my_mac; +} + +/** + * batadv_max_header_len() - calculate maximum encapsulation overhead for a + * payload packet + * + * Return: the maximum encapsulation overhead in bytes. + */ +int batadv_max_header_len(void) +{ + int header_len = 0; + + header_len = max_t(int, header_len, + sizeof(struct batadv_unicast_packet)); + header_len = max_t(int, header_len, + sizeof(struct batadv_unicast_4addr_packet)); + header_len = max_t(int, header_len, + sizeof(struct batadv_bcast_packet)); + +#ifdef CONFIG_BATMAN_ADV_NC + header_len = max_t(int, header_len, + sizeof(struct batadv_coded_packet)); +#endif + + return header_len + ETH_HLEN; +} + +/** + * batadv_skb_set_priority() - sets skb priority according to packet content + * @skb: the packet to be sent + * @offset: offset to the packet content + * + * This function sets a value between 256 and 263 (802.1d priority), which + * can be interpreted by the cfg80211 or other drivers. + */ +void batadv_skb_set_priority(struct sk_buff *skb, int offset) +{ + struct iphdr ip_hdr_tmp, *ip_hdr; + struct ipv6hdr ip6_hdr_tmp, *ip6_hdr; + struct ethhdr ethhdr_tmp, *ethhdr; + struct vlan_ethhdr *vhdr, vhdr_tmp; + u32 prio; + + /* already set, do nothing */ + if (skb->priority >= 256 && skb->priority <= 263) + return; + + ethhdr = skb_header_pointer(skb, offset, sizeof(*ethhdr), ðhdr_tmp); + if (!ethhdr) + return; + + switch (ethhdr->h_proto) { + case htons(ETH_P_8021Q): + vhdr = skb_header_pointer(skb, offset + sizeof(*vhdr), + sizeof(*vhdr), &vhdr_tmp); + if (!vhdr) + return; + prio = ntohs(vhdr->h_vlan_TCI) & VLAN_PRIO_MASK; + prio = prio >> VLAN_PRIO_SHIFT; + break; + case htons(ETH_P_IP): + ip_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), + sizeof(*ip_hdr), &ip_hdr_tmp); + if (!ip_hdr) + return; + prio = (ipv4_get_dsfield(ip_hdr) & 0xfc) >> 5; + break; + case htons(ETH_P_IPV6): + ip6_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr), + sizeof(*ip6_hdr), &ip6_hdr_tmp); + if (!ip6_hdr) + return; + prio = (ipv6_get_dsfield(ip6_hdr) & 0xfc) >> 5; + break; + default: + return; + } + + skb->priority = prio + 256; +} + +static int batadv_recv_unhandled_packet(struct sk_buff *skb, + struct batadv_hard_iface *recv_if) +{ + kfree_skb(skb); + + return NET_RX_DROP; +} + +/* incoming packets with the batman ethertype received on any active hard + * interface + */ + +/** + * batadv_batman_skb_recv() - Handle incoming message from an hard interface + * @skb: the received packet + * @dev: the net device that the packet was received on + * @ptype: packet type of incoming packet (ETH_P_BATMAN) + * @orig_dev: the original receive net device (e.g. bonded device) + * + * Return: NET_RX_SUCCESS on success or NET_RX_DROP in case of failure + */ +int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, + struct packet_type *ptype, + struct net_device *orig_dev) +{ + struct batadv_priv *bat_priv; + struct batadv_ogm_packet *batadv_ogm_packet; + struct batadv_hard_iface *hard_iface; + u8 idx; + + hard_iface = container_of(ptype, struct batadv_hard_iface, + batman_adv_ptype); + + /* Prevent processing a packet received on an interface which is getting + * shut down otherwise the packet may trigger de-reference errors + * further down in the receive path. + */ + if (!kref_get_unless_zero(&hard_iface->refcount)) + goto err_out; + + skb = skb_share_check(skb, GFP_ATOMIC); + + /* skb was released by skb_share_check() */ + if (!skb) + goto err_put; + + /* packet should hold at least type and version */ + if (unlikely(!pskb_may_pull(skb, 2))) + goto err_free; + + /* expect a valid ethernet header here. */ + if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb))) + goto err_free; + + if (!hard_iface->soft_iface) + goto err_free; + + bat_priv = netdev_priv(hard_iface->soft_iface); + + if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) + goto err_free; + + /* discard frames on not active interfaces */ + if (hard_iface->if_status != BATADV_IF_ACTIVE) + goto err_free; + + batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data; + + if (batadv_ogm_packet->version != BATADV_COMPAT_VERSION) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Drop packet: incompatible batman version (%i)\n", + batadv_ogm_packet->version); + goto err_free; + } + + /* reset control block to avoid left overs from previous users */ + memset(skb->cb, 0, sizeof(struct batadv_skb_cb)); + + idx = batadv_ogm_packet->packet_type; + (*batadv_rx_handler[idx])(skb, hard_iface); + + batadv_hardif_put(hard_iface); + + /* return NET_RX_SUCCESS in any case as we + * most probably dropped the packet for + * routing-logical reasons. + */ + return NET_RX_SUCCESS; + +err_free: + kfree_skb(skb); +err_put: + batadv_hardif_put(hard_iface); +err_out: + return NET_RX_DROP; +} + +static void batadv_recv_handler_init(void) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++) + batadv_rx_handler[i] = batadv_recv_unhandled_packet; + + for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++) + batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet; + + /* compile time checks for sizes */ + BUILD_BUG_ON(sizeof(struct batadv_bla_claim_dst) != 6); + BUILD_BUG_ON(sizeof(struct batadv_ogm_packet) != 24); + BUILD_BUG_ON(sizeof(struct batadv_icmp_header) != 20); + BUILD_BUG_ON(sizeof(struct batadv_icmp_packet) != 20); + BUILD_BUG_ON(sizeof(struct batadv_icmp_packet_rr) != 116); + BUILD_BUG_ON(sizeof(struct batadv_unicast_packet) != 10); + BUILD_BUG_ON(sizeof(struct batadv_unicast_4addr_packet) != 18); + BUILD_BUG_ON(sizeof(struct batadv_frag_packet) != 20); + BUILD_BUG_ON(sizeof(struct batadv_bcast_packet) != 14); + BUILD_BUG_ON(sizeof(struct batadv_coded_packet) != 46); + BUILD_BUG_ON(sizeof(struct batadv_unicast_tvlv_packet) != 20); + BUILD_BUG_ON(sizeof(struct batadv_tvlv_hdr) != 4); + BUILD_BUG_ON(sizeof(struct batadv_tvlv_gateway_data) != 8); + BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_vlan_data) != 8); + BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_change) != 12); + BUILD_BUG_ON(sizeof(struct batadv_tvlv_roam_adv) != 8); + + i = sizeof_field(struct sk_buff, cb); + BUILD_BUG_ON(sizeof(struct batadv_skb_cb) > i); + + /* broadcast packet */ + batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet; + + /* unicast packets ... */ + /* unicast with 4 addresses packet */ + batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet; + /* unicast packet */ + batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet; + /* unicast tvlv packet */ + batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv; + /* batman icmp packet */ + batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet; + /* Fragmented packets */ + batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet; +} + +/** + * batadv_recv_handler_register() - Register handler for batman-adv packet type + * @packet_type: batadv_packettype which should be handled + * @recv_handler: receive handler for the packet type + * + * Return: 0 on success or negative error number in case of failure + */ +int +batadv_recv_handler_register(u8 packet_type, + int (*recv_handler)(struct sk_buff *, + struct batadv_hard_iface *)) +{ + int (*curr)(struct sk_buff *skb, + struct batadv_hard_iface *recv_if); + curr = batadv_rx_handler[packet_type]; + + if (curr != batadv_recv_unhandled_packet && + curr != batadv_recv_unhandled_unicast_packet) + return -EBUSY; + + batadv_rx_handler[packet_type] = recv_handler; + return 0; +} + +/** + * batadv_recv_handler_unregister() - Unregister handler for packet type + * @packet_type: batadv_packettype which should no longer be handled + */ +void batadv_recv_handler_unregister(u8 packet_type) +{ + batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet; +} + +/** + * batadv_skb_crc32() - calculate CRC32 of the whole packet and skip bytes in + * the header + * @skb: skb pointing to fragmented socket buffers + * @payload_ptr: Pointer to position inside the head buffer of the skb + * marking the start of the data to be CRC'ed + * + * payload_ptr must always point to an address in the skb head buffer and not to + * a fragment. + * + * Return: big endian crc32c of the checksummed data + */ +__be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr) +{ + u32 crc = 0; + unsigned int from; + unsigned int to = skb->len; + struct skb_seq_state st; + const u8 *data; + unsigned int len; + unsigned int consumed = 0; + + from = (unsigned int)(payload_ptr - skb->data); + + skb_prepare_seq_read(skb, from, to, &st); + while ((len = skb_seq_read(consumed, &data, &st)) != 0) { + crc = crc32c(crc, data, len); + consumed += len; + } + + return htonl(crc); +} + +/** + * batadv_get_vid() - extract the VLAN identifier from skb if any + * @skb: the buffer containing the packet + * @header_len: length of the batman header preceding the ethernet header + * + * Return: VID with the BATADV_VLAN_HAS_TAG flag when the packet embedded in the + * skb is vlan tagged. Otherwise BATADV_NO_FLAGS. + */ +unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len) +{ + struct ethhdr *ethhdr = (struct ethhdr *)(skb->data + header_len); + struct vlan_ethhdr *vhdr; + unsigned short vid; + + if (ethhdr->h_proto != htons(ETH_P_8021Q)) + return BATADV_NO_FLAGS; + + if (!pskb_may_pull(skb, header_len + VLAN_ETH_HLEN)) + return BATADV_NO_FLAGS; + + vhdr = (struct vlan_ethhdr *)(skb->data + header_len); + vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; + vid |= BATADV_VLAN_HAS_TAG; + + return vid; +} + +/** + * batadv_vlan_ap_isola_get() - return AP isolation status for the given vlan + * @bat_priv: the bat priv with all the soft interface information + * @vid: the VLAN identifier for which the AP isolation attributed as to be + * looked up + * + * Return: true if AP isolation is on for the VLAN identified by vid, false + * otherwise + */ +bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid) +{ + bool ap_isolation_enabled = false; + struct batadv_softif_vlan *vlan; + + /* if the AP isolation is requested on a VLAN, then check for its + * setting in the proper VLAN private data structure + */ + vlan = batadv_softif_vlan_get(bat_priv, vid); + if (vlan) { + ap_isolation_enabled = atomic_read(&vlan->ap_isolation); + batadv_softif_vlan_put(vlan); + } + + return ap_isolation_enabled; +} + +/** + * batadv_throw_uevent() - Send an uevent with batman-adv specific env data + * @bat_priv: the bat priv with all the soft interface information + * @type: subsystem type of event. Stored in uevent's BATTYPE + * @action: action type of event. Stored in uevent's BATACTION + * @data: string with additional information to the event (ignored for + * BATADV_UEV_DEL). Stored in uevent's BATDATA + * + * Return: 0 on success or negative error number in case of failure + */ +int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type, + enum batadv_uev_action action, const char *data) +{ + int ret = -ENOMEM; + struct kobject *bat_kobj; + char *uevent_env[4] = { NULL, NULL, NULL, NULL }; + + bat_kobj = &bat_priv->soft_iface->dev.kobj; + + uevent_env[0] = kasprintf(GFP_ATOMIC, + "%s%s", BATADV_UEV_TYPE_VAR, + batadv_uev_type_str[type]); + if (!uevent_env[0]) + goto out; + + uevent_env[1] = kasprintf(GFP_ATOMIC, + "%s%s", BATADV_UEV_ACTION_VAR, + batadv_uev_action_str[action]); + if (!uevent_env[1]) + goto out; + + /* If the event is DEL, ignore the data field */ + if (action != BATADV_UEV_DEL) { + uevent_env[2] = kasprintf(GFP_ATOMIC, + "%s%s", BATADV_UEV_DATA_VAR, data); + if (!uevent_env[2]) + goto out; + } + + ret = kobject_uevent_env(bat_kobj, KOBJ_CHANGE, uevent_env); +out: + kfree(uevent_env[0]); + kfree(uevent_env[1]); + kfree(uevent_env[2]); + + if (ret) + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Impossible to send uevent for (%s,%s,%s) event (err: %d)\n", + batadv_uev_type_str[type], + batadv_uev_action_str[action], + (action == BATADV_UEV_DEL ? "NULL" : data), ret); + return ret; +} + +module_init(batadv_init); +module_exit(batadv_exit); + +MODULE_LICENSE("GPL"); + +MODULE_AUTHOR(BATADV_DRIVER_AUTHOR); +MODULE_DESCRIPTION(BATADV_DRIVER_DESC); +MODULE_VERSION(BATADV_SOURCE_VERSION); +MODULE_ALIAS_RTNL_LINK("batadv"); +MODULE_ALIAS_GENL_FAMILY(BATADV_NL_NAME); diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h new file mode 100644 index 000000000..c48803b32 --- /dev/null +++ b/net/batman-adv/main.h @@ -0,0 +1,384 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + */ + +#ifndef _NET_BATMAN_ADV_MAIN_H_ +#define _NET_BATMAN_ADV_MAIN_H_ + +#define BATADV_DRIVER_AUTHOR "Marek Lindner <mareklindner@neomailbox.ch>, " \ + "Simon Wunderlich <sw@simonwunderlich.de>" +#define BATADV_DRIVER_DESC "B.A.T.M.A.N. advanced" +#define BATADV_DRIVER_DEVICE "batman-adv" + +#ifndef BATADV_SOURCE_VERSION +#define BATADV_SOURCE_VERSION "2022.3" +#endif + +/* B.A.T.M.A.N. parameters */ + +#define BATADV_TQ_MAX_VALUE 255 +#define BATADV_THROUGHPUT_MAX_VALUE 0xFFFFFFFF +#define BATADV_JITTER 20 + +/* Time To Live of broadcast messages */ +#define BATADV_TTL 50 + +/* maximum sequence number age of broadcast messages */ +#define BATADV_BCAST_MAX_AGE 64 + +/* purge originators after time in seconds if no valid packet comes in + * -> TODO: check influence on BATADV_TQ_LOCAL_WINDOW_SIZE + */ +#define BATADV_PURGE_TIMEOUT 200000 /* 200 seconds */ +#define BATADV_TT_LOCAL_TIMEOUT 600000 /* in milliseconds */ +#define BATADV_TT_CLIENT_ROAM_TIMEOUT 600000 /* in milliseconds */ +#define BATADV_TT_CLIENT_TEMP_TIMEOUT 600000 /* in milliseconds */ +#define BATADV_TT_WORK_PERIOD 5000 /* 5 seconds */ +#define BATADV_ORIG_WORK_PERIOD 1000 /* 1 second */ +#define BATADV_MCAST_WORK_PERIOD 500 /* 0.5 seconds */ +#define BATADV_DAT_ENTRY_TIMEOUT (5 * 60000) /* 5 mins in milliseconds */ +/* sliding packet range of received originator messages in sequence numbers + * (should be a multiple of our word size) + */ +#define BATADV_TQ_LOCAL_WINDOW_SIZE 64 +/* milliseconds we have to keep pending tt_req */ +#define BATADV_TT_REQUEST_TIMEOUT 3000 + +#define BATADV_TQ_GLOBAL_WINDOW_SIZE 5 +#define BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM 1 +#define BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM 1 +#define BATADV_TQ_TOTAL_BIDRECT_LIMIT 1 + +/* B.A.T.M.A.N. V */ +#define BATADV_THROUGHPUT_DEFAULT_VALUE 10 /* 1 Mbps */ +#define BATADV_ELP_PROBES_PER_NODE 2 +#define BATADV_ELP_MIN_PROBE_SIZE 200 /* bytes */ +#define BATADV_ELP_PROBE_MAX_TX_DIFF 100 /* milliseconds */ +#define BATADV_ELP_MAX_AGE 64 +#define BATADV_OGM_MAX_ORIGDIFF 5 +#define BATADV_OGM_MAX_AGE 64 + +/* number of OGMs sent with the last tt diff */ +#define BATADV_TT_OGM_APPEND_MAX 3 + +/* Time in which a client can roam at most ROAMING_MAX_COUNT times in + * milliseconds + */ +#define BATADV_ROAMING_MAX_TIME 20000 +#define BATADV_ROAMING_MAX_COUNT 5 + +#define BATADV_NO_FLAGS 0 + +#define BATADV_NULL_IFINDEX 0 /* dummy ifindex used to avoid iface checks */ + +#define BATADV_NO_MARK 0 + +/* default interface for multi interface operation. The default interface is + * used for communication which originated locally (i.e. is not forwarded) + * or where special forwarding is not desired/necessary. + */ +#define BATADV_IF_DEFAULT ((struct batadv_hard_iface *)NULL) + +#define BATADV_NUM_WORDS BITS_TO_LONGS(BATADV_TQ_LOCAL_WINDOW_SIZE) + +#define BATADV_LOG_BUF_LEN 8192 /* has to be a power of 2 */ + +/* number of packets to send for broadcasts on different interface types */ +#define BATADV_NUM_BCASTS_DEFAULT 1 +#define BATADV_NUM_BCASTS_WIRELESS 3 + +/* length of the single packet used by the TP meter */ +#define BATADV_TP_PACKET_LEN ETH_DATA_LEN + +/* msecs after which an ARP_REQUEST is sent in broadcast as fallback */ +#define ARP_REQ_DELAY 250 +/* numbers of originator to contact for any PUT/GET DHT operation */ +#define BATADV_DAT_CANDIDATES_NUM 3 + +/* BATADV_TQ_SIMILARITY_THRESHOLD - TQ points that a secondary metric can differ + * at most from the primary one in order to be still considered acceptable + */ +#define BATADV_TQ_SIMILARITY_THRESHOLD 50 + +/* should not be bigger than 512 bytes or change the size of + * forw_packet->direct_link_flags + */ +#define BATADV_MAX_AGGREGATION_BYTES 512 +#define BATADV_MAX_AGGREGATION_MS 100 + +#define BATADV_BLA_PERIOD_LENGTH 10000 /* 10 seconds */ +#define BATADV_BLA_BACKBONE_TIMEOUT (BATADV_BLA_PERIOD_LENGTH * 6) +#define BATADV_BLA_CLAIM_TIMEOUT (BATADV_BLA_PERIOD_LENGTH * 10) +#define BATADV_BLA_WAIT_PERIODS 3 +#define BATADV_BLA_LOOPDETECT_PERIODS 6 +#define BATADV_BLA_LOOPDETECT_TIMEOUT 3000 /* 3 seconds */ + +#define BATADV_DUPLIST_SIZE 16 +#define BATADV_DUPLIST_TIMEOUT 500 /* 500 ms */ +/* don't reset again within 30 seconds */ +#define BATADV_RESET_PROTECTION_MS 30000 +#define BATADV_EXPECTED_SEQNO_RANGE 65536 + +#define BATADV_NC_NODE_TIMEOUT 10000 /* Milliseconds */ + +/** + * BATADV_TP_MAX_NUM - maximum number of simultaneously active tp sessions + */ +#define BATADV_TP_MAX_NUM 5 + +/** + * enum batadv_mesh_state - State of a soft interface + */ +enum batadv_mesh_state { + /** @BATADV_MESH_INACTIVE: soft interface is not yet running */ + BATADV_MESH_INACTIVE, + + /** @BATADV_MESH_ACTIVE: interface is up and running */ + BATADV_MESH_ACTIVE, + + /** @BATADV_MESH_DEACTIVATING: interface is getting shut down */ + BATADV_MESH_DEACTIVATING, +}; + +#define BATADV_BCAST_QUEUE_LEN 256 +#define BATADV_BATMAN_QUEUE_LEN 256 + +/** + * enum batadv_uev_action - action type of uevent + */ +enum batadv_uev_action { + /** @BATADV_UEV_ADD: gateway was selected (after none was selected) */ + BATADV_UEV_ADD = 0, + + /** + * @BATADV_UEV_DEL: selected gateway was removed and none is selected + * anymore + */ + BATADV_UEV_DEL, + + /** + * @BATADV_UEV_CHANGE: a different gateway was selected as based gateway + */ + BATADV_UEV_CHANGE, + + /** + * @BATADV_UEV_LOOPDETECT: loop was detected which cannot be handled by + * bridge loop avoidance + */ + BATADV_UEV_LOOPDETECT, +}; + +/** + * enum batadv_uev_type - Type of uevent + */ +enum batadv_uev_type { + /** @BATADV_UEV_GW: selected gateway was modified */ + BATADV_UEV_GW = 0, + + /** @BATADV_UEV_BLA: bridge loop avoidance event */ + BATADV_UEV_BLA, +}; + +#define BATADV_GW_THRESHOLD 50 + +/* Number of fragment chains for each orig_node */ +#define BATADV_FRAG_BUFFER_COUNT 8 +/* Maximum number of fragments for one packet */ +#define BATADV_FRAG_MAX_FRAGMENTS 16 +/* Maxumim size of each fragment */ +#define BATADV_FRAG_MAX_FRAG_SIZE 1280 +/* Time to keep fragments while waiting for rest of the fragments */ +#define BATADV_FRAG_TIMEOUT 10000 + +#define BATADV_DAT_CANDIDATE_NOT_FOUND 0 +#define BATADV_DAT_CANDIDATE_ORIG 1 + +/* Debug Messages */ +#ifdef pr_fmt +#undef pr_fmt +#endif +/* Append 'batman-adv: ' before kernel messages */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +/* Kernel headers */ + +#include <linux/atomic.h> +#include <linux/compiler.h> +#include <linux/etherdevice.h> +#include <linux/if_vlan.h> +#include <linux/jiffies.h> +#include <linux/netdevice.h> +#include <linux/percpu.h> +#include <linux/skbuff.h> +#include <linux/types.h> +#include <uapi/linux/batadv_packet.h> + +#include "types.h" +#include "main.h" + +/** + * batadv_print_vid() - return printable version of vid information + * @vid: the VLAN identifier + * + * Return: -1 when no VLAN is used, VLAN id otherwise + */ +static inline int batadv_print_vid(unsigned short vid) +{ + if (vid & BATADV_VLAN_HAS_TAG) + return (int)(vid & VLAN_VID_MASK); + else + return -1; +} + +extern struct list_head batadv_hardif_list; +extern unsigned int batadv_hardif_generation; + +extern unsigned char batadv_broadcast_addr[]; +extern struct workqueue_struct *batadv_event_workqueue; + +int batadv_mesh_init(struct net_device *soft_iface); +void batadv_mesh_free(struct net_device *soft_iface); +bool batadv_is_my_mac(struct batadv_priv *bat_priv, const u8 *addr); +int batadv_max_header_len(void); +void batadv_skb_set_priority(struct sk_buff *skb, int offset); +int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev, + struct packet_type *ptype, + struct net_device *orig_dev); +int +batadv_recv_handler_register(u8 packet_type, + int (*recv_handler)(struct sk_buff *, + struct batadv_hard_iface *)); +void batadv_recv_handler_unregister(u8 packet_type); +__be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr); + +/** + * batadv_compare_eth() - Compare two not u16 aligned Ethernet addresses + * @data1: Pointer to a six-byte array containing the Ethernet address + * @data2: Pointer other six-byte array containing the Ethernet address + * + * note: can't use ether_addr_equal() as it requires aligned memory + * + * Return: true if they are the same ethernet addr + */ +static inline bool batadv_compare_eth(const void *data1, const void *data2) +{ + return ether_addr_equal_unaligned(data1, data2); +} + +/** + * batadv_has_timed_out() - compares current time (jiffies) and timestamp + + * timeout + * @timestamp: base value to compare with (in jiffies) + * @timeout: added to base value before comparing (in milliseconds) + * + * Return: true if current time is after timestamp + timeout + */ +static inline bool batadv_has_timed_out(unsigned long timestamp, + unsigned int timeout) +{ + return time_is_before_jiffies(timestamp + msecs_to_jiffies(timeout)); +} + +/** + * batadv_atomic_dec_not_zero() - Decrease unless the number is 0 + * @v: pointer of type atomic_t + * + * Return: non-zero if v was not 0, and zero otherwise. + */ +#define batadv_atomic_dec_not_zero(v) atomic_add_unless((v), -1, 0) + +/** + * batadv_smallest_signed_int() - Returns the smallest signed integer in two's + * complement with the sizeof x + * @x: type of integer + * + * Return: smallest signed integer of type + */ +#define batadv_smallest_signed_int(x) (1u << (7u + 8u * (sizeof(x) - 1u))) + +/** + * batadv_seq_before() - Checks if a sequence number x is a predecessor of y + * @x: potential predecessor of @y + * @y: value to compare @x against + * + * It handles overflows/underflows and can correctly check for a predecessor + * unless the variable sequence number has grown by more than + * 2**(bitwidth(x)-1)-1. + * + * This means that for a u8 with the maximum value 255, it would think: + * + * * when adding nothing - it is neither a predecessor nor a successor + * * before adding more than 127 to the starting value - it is a predecessor, + * * when adding 128 - it is neither a predecessor nor a successor, + * * after adding more than 127 to the starting value - it is a successor + * + * Return: true when x is a predecessor of y, false otherwise + */ +#define batadv_seq_before(x, y) ({ \ + typeof(x)_d1 = (x); \ + typeof(y)_d2 = (y); \ + typeof(x)_dummy = (_d1 - _d2); \ + (void)(&_d1 == &_d2); \ + _dummy > batadv_smallest_signed_int(_dummy); \ +}) + +/** + * batadv_seq_after() - Checks if a sequence number x is a successor of y + * @x: potential successor of @y + * @y: value to compare @x against + * + * It handles overflows/underflows and can correctly check for a successor + * unless the variable sequence number has grown by more than + * 2**(bitwidth(x)-1)-1. + * + * This means that for a u8 with the maximum value 255, it would think: + * + * * when adding nothing - it is neither a predecessor nor a successor + * * before adding more than 127 to the starting value - it is a predecessor, + * * when adding 128 - it is neither a predecessor nor a successor, + * * after adding more than 127 to the starting value - it is a successor + * + * Return: true when x is a successor of y, false otherwise + */ +#define batadv_seq_after(x, y) batadv_seq_before(y, x) + +/** + * batadv_add_counter() - Add to per cpu statistics counter of soft interface + * @bat_priv: the bat priv with all the soft interface information + * @idx: counter index which should be modified + * @count: value to increase counter by + * + * Stop preemption on local cpu while incrementing the counter + */ +static inline void batadv_add_counter(struct batadv_priv *bat_priv, size_t idx, + size_t count) +{ + this_cpu_add(bat_priv->bat_counters[idx], count); +} + +/** + * batadv_inc_counter() - Increase per cpu statistics counter of soft interface + * @b: the bat priv with all the soft interface information + * @i: counter index which should be modified + */ +#define batadv_inc_counter(b, i) batadv_add_counter(b, i, 1) + +/** + * BATADV_SKB_CB() - Get batadv_skb_cb from skb control buffer + * @__skb: skb holding the control buffer + * + * The members of the control buffer are defined in struct batadv_skb_cb in + * types.h. The macro is inspired by the similar macro TCP_SKB_CB() in tcp.h. + * + * Return: pointer to the batadv_skb_cb of the skb + */ +#define BATADV_SKB_CB(__skb) ((struct batadv_skb_cb *)&((__skb)->cb[0])) + +unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len); +bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid); +int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type, + enum batadv_uev_action action, const char *data); + +#endif /* _NET_BATMAN_ADV_MAIN_H_ */ diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c new file mode 100644 index 000000000..b23845591 --- /dev/null +++ b/net/batman-adv/multicast.c @@ -0,0 +1,2317 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Linus Lüssing + */ + +#include "multicast.h" +#include "main.h" + +#include <linux/atomic.h> +#include <linux/bitops.h> +#include <linux/bug.h> +#include <linux/byteorder/generic.h> +#include <linux/container_of.h> +#include <linux/errno.h> +#include <linux/etherdevice.h> +#include <linux/gfp.h> +#include <linux/icmpv6.h> +#include <linux/if_bridge.h> +#include <linux/if_ether.h> +#include <linux/igmp.h> +#include <linux/in.h> +#include <linux/in6.h> +#include <linux/inetdevice.h> +#include <linux/ip.h> +#include <linux/ipv6.h> +#include <linux/jiffies.h> +#include <linux/kernel.h> +#include <linux/kref.h> +#include <linux/list.h> +#include <linux/lockdep.h> +#include <linux/netdevice.h> +#include <linux/netlink.h> +#include <linux/printk.h> +#include <linux/rculist.h> +#include <linux/rcupdate.h> +#include <linux/skbuff.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/stddef.h> +#include <linux/string.h> +#include <linux/types.h> +#include <linux/workqueue.h> +#include <net/addrconf.h> +#include <net/genetlink.h> +#include <net/if_inet6.h> +#include <net/ip.h> +#include <net/ipv6.h> +#include <net/netlink.h> +#include <net/sock.h> +#include <uapi/linux/batadv_packet.h> +#include <uapi/linux/batman_adv.h> + +#include "bridge_loop_avoidance.h" +#include "hard-interface.h" +#include "hash.h" +#include "log.h" +#include "netlink.h" +#include "send.h" +#include "soft-interface.h" +#include "translation-table.h" +#include "tvlv.h" + +static void batadv_mcast_mla_update(struct work_struct *work); + +/** + * batadv_mcast_start_timer() - schedule the multicast periodic worker + * @bat_priv: the bat priv with all the soft interface information + */ +static void batadv_mcast_start_timer(struct batadv_priv *bat_priv) +{ + queue_delayed_work(batadv_event_workqueue, &bat_priv->mcast.work, + msecs_to_jiffies(BATADV_MCAST_WORK_PERIOD)); +} + +/** + * batadv_mcast_get_bridge() - get the bridge on top of the softif if it exists + * @soft_iface: netdev struct of the mesh interface + * + * If the given soft interface has a bridge on top then the refcount + * of the according net device is increased. + * + * Return: NULL if no such bridge exists. Otherwise the net device of the + * bridge. + */ +static struct net_device *batadv_mcast_get_bridge(struct net_device *soft_iface) +{ + struct net_device *upper = soft_iface; + + rcu_read_lock(); + do { + upper = netdev_master_upper_dev_get_rcu(upper); + } while (upper && !netif_is_bridge_master(upper)); + + dev_hold(upper); + rcu_read_unlock(); + + return upper; +} + +/** + * batadv_mcast_mla_rtr_flags_softif_get_ipv4() - get mcast router flags from + * node for IPv4 + * @dev: the interface to check + * + * Checks the presence of an IPv4 multicast router on this node. + * + * Caller needs to hold rcu read lock. + * + * Return: BATADV_NO_FLAGS if present, BATADV_MCAST_WANT_NO_RTR4 otherwise. + */ +static u8 batadv_mcast_mla_rtr_flags_softif_get_ipv4(struct net_device *dev) +{ + struct in_device *in_dev = __in_dev_get_rcu(dev); + + if (in_dev && IN_DEV_MFORWARD(in_dev)) + return BATADV_NO_FLAGS; + else + return BATADV_MCAST_WANT_NO_RTR4; +} + +/** + * batadv_mcast_mla_rtr_flags_softif_get_ipv6() - get mcast router flags from + * node for IPv6 + * @dev: the interface to check + * + * Checks the presence of an IPv6 multicast router on this node. + * + * Caller needs to hold rcu read lock. + * + * Return: BATADV_NO_FLAGS if present, BATADV_MCAST_WANT_NO_RTR6 otherwise. + */ +#if IS_ENABLED(CONFIG_IPV6_MROUTE) +static u8 batadv_mcast_mla_rtr_flags_softif_get_ipv6(struct net_device *dev) +{ + struct inet6_dev *in6_dev = __in6_dev_get(dev); + + if (in6_dev && atomic_read(&in6_dev->cnf.mc_forwarding)) + return BATADV_NO_FLAGS; + else + return BATADV_MCAST_WANT_NO_RTR6; +} +#else +static inline u8 +batadv_mcast_mla_rtr_flags_softif_get_ipv6(struct net_device *dev) +{ + return BATADV_MCAST_WANT_NO_RTR6; +} +#endif + +/** + * batadv_mcast_mla_rtr_flags_softif_get() - get mcast router flags from node + * @bat_priv: the bat priv with all the soft interface information + * @bridge: bridge interface on top of the soft_iface if present, + * otherwise pass NULL + * + * Checks the presence of IPv4 and IPv6 multicast routers on this + * node. + * + * Return: + * BATADV_NO_FLAGS: Both an IPv4 and IPv6 multicast router is present + * BATADV_MCAST_WANT_NO_RTR4: No IPv4 multicast router is present + * BATADV_MCAST_WANT_NO_RTR6: No IPv6 multicast router is present + * The former two OR'd: no multicast router is present + */ +static u8 batadv_mcast_mla_rtr_flags_softif_get(struct batadv_priv *bat_priv, + struct net_device *bridge) +{ + struct net_device *dev = bridge ? bridge : bat_priv->soft_iface; + u8 flags = BATADV_NO_FLAGS; + + rcu_read_lock(); + + flags |= batadv_mcast_mla_rtr_flags_softif_get_ipv4(dev); + flags |= batadv_mcast_mla_rtr_flags_softif_get_ipv6(dev); + + rcu_read_unlock(); + + return flags; +} + +/** + * batadv_mcast_mla_rtr_flags_bridge_get() - get mcast router flags from bridge + * @bat_priv: the bat priv with all the soft interface information + * @bridge: bridge interface on top of the soft_iface if present, + * otherwise pass NULL + * + * Checks the presence of IPv4 and IPv6 multicast routers behind a bridge. + * + * Return: + * BATADV_NO_FLAGS: Both an IPv4 and IPv6 multicast router is present + * BATADV_MCAST_WANT_NO_RTR4: No IPv4 multicast router is present + * BATADV_MCAST_WANT_NO_RTR6: No IPv6 multicast router is present + * The former two OR'd: no multicast router is present + */ +static u8 batadv_mcast_mla_rtr_flags_bridge_get(struct batadv_priv *bat_priv, + struct net_device *bridge) +{ + struct net_device *dev = bat_priv->soft_iface; + u8 flags = BATADV_NO_FLAGS; + + if (!bridge) + return BATADV_MCAST_WANT_NO_RTR4 | BATADV_MCAST_WANT_NO_RTR6; + + if (!br_multicast_has_router_adjacent(dev, ETH_P_IP)) + flags |= BATADV_MCAST_WANT_NO_RTR4; + if (!br_multicast_has_router_adjacent(dev, ETH_P_IPV6)) + flags |= BATADV_MCAST_WANT_NO_RTR6; + + return flags; +} + +/** + * batadv_mcast_mla_rtr_flags_get() - get multicast router flags + * @bat_priv: the bat priv with all the soft interface information + * @bridge: bridge interface on top of the soft_iface if present, + * otherwise pass NULL + * + * Checks the presence of IPv4 and IPv6 multicast routers on this + * node or behind its bridge. + * + * Return: + * BATADV_NO_FLAGS: Both an IPv4 and IPv6 multicast router is present + * BATADV_MCAST_WANT_NO_RTR4: No IPv4 multicast router is present + * BATADV_MCAST_WANT_NO_RTR6: No IPv6 multicast router is present + * The former two OR'd: no multicast router is present + */ +static u8 batadv_mcast_mla_rtr_flags_get(struct batadv_priv *bat_priv, + struct net_device *bridge) +{ + u8 flags = BATADV_MCAST_WANT_NO_RTR4 | BATADV_MCAST_WANT_NO_RTR6; + + flags &= batadv_mcast_mla_rtr_flags_softif_get(bat_priv, bridge); + flags &= batadv_mcast_mla_rtr_flags_bridge_get(bat_priv, bridge); + + return flags; +} + +/** + * batadv_mcast_mla_flags_get() - get the new multicast flags + * @bat_priv: the bat priv with all the soft interface information + * + * Return: A set of flags for the current/next TVLV, querier and + * bridge state. + */ +static struct batadv_mcast_mla_flags +batadv_mcast_mla_flags_get(struct batadv_priv *bat_priv) +{ + struct net_device *dev = bat_priv->soft_iface; + struct batadv_mcast_querier_state *qr4, *qr6; + struct batadv_mcast_mla_flags mla_flags; + struct net_device *bridge; + + bridge = batadv_mcast_get_bridge(dev); + + memset(&mla_flags, 0, sizeof(mla_flags)); + mla_flags.enabled = 1; + mla_flags.tvlv_flags |= batadv_mcast_mla_rtr_flags_get(bat_priv, + bridge); + + if (!bridge) + return mla_flags; + + dev_put(bridge); + + mla_flags.bridged = 1; + qr4 = &mla_flags.querier_ipv4; + qr6 = &mla_flags.querier_ipv6; + + if (!IS_ENABLED(CONFIG_BRIDGE_IGMP_SNOOPING)) + pr_warn_once("No bridge IGMP snooping compiled - multicast optimizations disabled\n"); + + qr4->exists = br_multicast_has_querier_anywhere(dev, ETH_P_IP); + qr4->shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IP); + + qr6->exists = br_multicast_has_querier_anywhere(dev, ETH_P_IPV6); + qr6->shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IPV6); + + mla_flags.tvlv_flags |= BATADV_MCAST_WANT_ALL_UNSNOOPABLES; + + /* 1) If no querier exists at all, then multicast listeners on + * our local TT clients behind the bridge will keep silent. + * 2) If the selected querier is on one of our local TT clients, + * behind the bridge, then this querier might shadow multicast + * listeners on our local TT clients, behind this bridge. + * + * In both cases, we will signalize other batman nodes that + * we need all multicast traffic of the according protocol. + */ + if (!qr4->exists || qr4->shadowing) { + mla_flags.tvlv_flags |= BATADV_MCAST_WANT_ALL_IPV4; + mla_flags.tvlv_flags &= ~BATADV_MCAST_WANT_NO_RTR4; + } + + if (!qr6->exists || qr6->shadowing) { + mla_flags.tvlv_flags |= BATADV_MCAST_WANT_ALL_IPV6; + mla_flags.tvlv_flags &= ~BATADV_MCAST_WANT_NO_RTR6; + } + + return mla_flags; +} + +/** + * batadv_mcast_mla_is_duplicate() - check whether an address is in a list + * @mcast_addr: the multicast address to check + * @mcast_list: the list with multicast addresses to search in + * + * Return: true if the given address is already in the given list. + * Otherwise returns false. + */ +static bool batadv_mcast_mla_is_duplicate(u8 *mcast_addr, + struct hlist_head *mcast_list) +{ + struct batadv_hw_addr *mcast_entry; + + hlist_for_each_entry(mcast_entry, mcast_list, list) + if (batadv_compare_eth(mcast_entry->addr, mcast_addr)) + return true; + + return false; +} + +/** + * batadv_mcast_mla_softif_get_ipv4() - get softif IPv4 multicast listeners + * @dev: the device to collect multicast addresses from + * @mcast_list: a list to put found addresses into + * @flags: flags indicating the new multicast state + * + * Collects multicast addresses of IPv4 multicast listeners residing + * on this kernel on the given soft interface, dev, in + * the given mcast_list. In general, multicast listeners provided by + * your multicast receiving applications run directly on this node. + * + * Return: -ENOMEM on memory allocation error or the number of + * items added to the mcast_list otherwise. + */ +static int +batadv_mcast_mla_softif_get_ipv4(struct net_device *dev, + struct hlist_head *mcast_list, + struct batadv_mcast_mla_flags *flags) +{ + struct batadv_hw_addr *new; + struct in_device *in_dev; + u8 mcast_addr[ETH_ALEN]; + struct ip_mc_list *pmc; + int ret = 0; + + if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_IPV4) + return 0; + + rcu_read_lock(); + + in_dev = __in_dev_get_rcu(dev); + if (!in_dev) { + rcu_read_unlock(); + return 0; + } + + for (pmc = rcu_dereference(in_dev->mc_list); pmc; + pmc = rcu_dereference(pmc->next_rcu)) { + if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && + ipv4_is_local_multicast(pmc->multiaddr)) + continue; + + if (!(flags->tvlv_flags & BATADV_MCAST_WANT_NO_RTR4) && + !ipv4_is_local_multicast(pmc->multiaddr)) + continue; + + ip_eth_mc_map(pmc->multiaddr, mcast_addr); + + if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list)) + continue; + + new = kmalloc(sizeof(*new), GFP_ATOMIC); + if (!new) { + ret = -ENOMEM; + break; + } + + ether_addr_copy(new->addr, mcast_addr); + hlist_add_head(&new->list, mcast_list); + ret++; + } + rcu_read_unlock(); + + return ret; +} + +/** + * batadv_mcast_mla_softif_get_ipv6() - get softif IPv6 multicast listeners + * @dev: the device to collect multicast addresses from + * @mcast_list: a list to put found addresses into + * @flags: flags indicating the new multicast state + * + * Collects multicast addresses of IPv6 multicast listeners residing + * on this kernel on the given soft interface, dev, in + * the given mcast_list. In general, multicast listeners provided by + * your multicast receiving applications run directly on this node. + * + * Return: -ENOMEM on memory allocation error or the number of + * items added to the mcast_list otherwise. + */ +#if IS_ENABLED(CONFIG_IPV6) +static int +batadv_mcast_mla_softif_get_ipv6(struct net_device *dev, + struct hlist_head *mcast_list, + struct batadv_mcast_mla_flags *flags) +{ + struct batadv_hw_addr *new; + struct inet6_dev *in6_dev; + u8 mcast_addr[ETH_ALEN]; + struct ifmcaddr6 *pmc6; + int ret = 0; + + if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_IPV6) + return 0; + + rcu_read_lock(); + + in6_dev = __in6_dev_get(dev); + if (!in6_dev) { + rcu_read_unlock(); + return 0; + } + + for (pmc6 = rcu_dereference(in6_dev->mc_list); + pmc6; + pmc6 = rcu_dereference(pmc6->next)) { + if (IPV6_ADDR_MC_SCOPE(&pmc6->mca_addr) < + IPV6_ADDR_SCOPE_LINKLOCAL) + continue; + + if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && + ipv6_addr_is_ll_all_nodes(&pmc6->mca_addr)) + continue; + + if (!(flags->tvlv_flags & BATADV_MCAST_WANT_NO_RTR6) && + IPV6_ADDR_MC_SCOPE(&pmc6->mca_addr) > + IPV6_ADDR_SCOPE_LINKLOCAL) + continue; + + ipv6_eth_mc_map(&pmc6->mca_addr, mcast_addr); + + if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list)) + continue; + + new = kmalloc(sizeof(*new), GFP_ATOMIC); + if (!new) { + ret = -ENOMEM; + break; + } + + ether_addr_copy(new->addr, mcast_addr); + hlist_add_head(&new->list, mcast_list); + ret++; + } + rcu_read_unlock(); + + return ret; +} +#else +static inline int +batadv_mcast_mla_softif_get_ipv6(struct net_device *dev, + struct hlist_head *mcast_list, + struct batadv_mcast_mla_flags *flags) +{ + return 0; +} +#endif + +/** + * batadv_mcast_mla_softif_get() - get softif multicast listeners + * @dev: the device to collect multicast addresses from + * @mcast_list: a list to put found addresses into + * @flags: flags indicating the new multicast state + * + * Collects multicast addresses of multicast listeners residing + * on this kernel on the given soft interface, dev, in + * the given mcast_list. In general, multicast listeners provided by + * your multicast receiving applications run directly on this node. + * + * If there is a bridge interface on top of dev, collect from that one + * instead. Just like with IP addresses and routes, multicast listeners + * will(/should) register to the bridge interface instead of an + * enslaved bat0. + * + * Return: -ENOMEM on memory allocation error or the number of + * items added to the mcast_list otherwise. + */ +static int +batadv_mcast_mla_softif_get(struct net_device *dev, + struct hlist_head *mcast_list, + struct batadv_mcast_mla_flags *flags) +{ + struct net_device *bridge = batadv_mcast_get_bridge(dev); + int ret4, ret6 = 0; + + if (bridge) + dev = bridge; + + ret4 = batadv_mcast_mla_softif_get_ipv4(dev, mcast_list, flags); + if (ret4 < 0) + goto out; + + ret6 = batadv_mcast_mla_softif_get_ipv6(dev, mcast_list, flags); + if (ret6 < 0) { + ret4 = 0; + goto out; + } + +out: + dev_put(bridge); + + return ret4 + ret6; +} + +/** + * batadv_mcast_mla_br_addr_cpy() - copy a bridge multicast address + * @dst: destination to write to - a multicast MAC address + * @src: source to read from - a multicast IP address + * + * Converts a given multicast IPv4/IPv6 address from a bridge + * to its matching multicast MAC address and copies it into the given + * destination buffer. + * + * Caller needs to make sure the destination buffer can hold + * at least ETH_ALEN bytes. + */ +static void batadv_mcast_mla_br_addr_cpy(char *dst, const struct br_ip *src) +{ + if (src->proto == htons(ETH_P_IP)) + ip_eth_mc_map(src->dst.ip4, dst); +#if IS_ENABLED(CONFIG_IPV6) + else if (src->proto == htons(ETH_P_IPV6)) + ipv6_eth_mc_map(&src->dst.ip6, dst); +#endif + else + eth_zero_addr(dst); +} + +/** + * batadv_mcast_mla_bridge_get() - get bridged-in multicast listeners + * @dev: a bridge slave whose bridge to collect multicast addresses from + * @mcast_list: a list to put found addresses into + * @flags: flags indicating the new multicast state + * + * Collects multicast addresses of multicast listeners residing + * on foreign, non-mesh devices which we gave access to our mesh via + * a bridge on top of the given soft interface, dev, in the given + * mcast_list. + * + * Return: -ENOMEM on memory allocation error or the number of + * items added to the mcast_list otherwise. + */ +static int batadv_mcast_mla_bridge_get(struct net_device *dev, + struct hlist_head *mcast_list, + struct batadv_mcast_mla_flags *flags) +{ + struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list); + struct br_ip_list *br_ip_entry, *tmp; + u8 tvlv_flags = flags->tvlv_flags; + struct batadv_hw_addr *new; + u8 mcast_addr[ETH_ALEN]; + int ret; + + /* we don't need to detect these devices/listeners, the IGMP/MLD + * snooping code of the Linux bridge already does that for us + */ + ret = br_multicast_list_adjacent(dev, &bridge_mcast_list); + if (ret < 0) + goto out; + + list_for_each_entry(br_ip_entry, &bridge_mcast_list, list) { + if (br_ip_entry->addr.proto == htons(ETH_P_IP)) { + if (tvlv_flags & BATADV_MCAST_WANT_ALL_IPV4) + continue; + + if (tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && + ipv4_is_local_multicast(br_ip_entry->addr.dst.ip4)) + continue; + + if (!(tvlv_flags & BATADV_MCAST_WANT_NO_RTR4) && + !ipv4_is_local_multicast(br_ip_entry->addr.dst.ip4)) + continue; + } + +#if IS_ENABLED(CONFIG_IPV6) + if (br_ip_entry->addr.proto == htons(ETH_P_IPV6)) { + if (tvlv_flags & BATADV_MCAST_WANT_ALL_IPV6) + continue; + + if (tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && + ipv6_addr_is_ll_all_nodes(&br_ip_entry->addr.dst.ip6)) + continue; + + if (!(tvlv_flags & BATADV_MCAST_WANT_NO_RTR6) && + IPV6_ADDR_MC_SCOPE(&br_ip_entry->addr.dst.ip6) > + IPV6_ADDR_SCOPE_LINKLOCAL) + continue; + } +#endif + + batadv_mcast_mla_br_addr_cpy(mcast_addr, &br_ip_entry->addr); + if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list)) + continue; + + new = kmalloc(sizeof(*new), GFP_ATOMIC); + if (!new) { + ret = -ENOMEM; + break; + } + + ether_addr_copy(new->addr, mcast_addr); + hlist_add_head(&new->list, mcast_list); + } + +out: + list_for_each_entry_safe(br_ip_entry, tmp, &bridge_mcast_list, list) { + list_del(&br_ip_entry->list); + kfree(br_ip_entry); + } + + return ret; +} + +/** + * batadv_mcast_mla_list_free() - free a list of multicast addresses + * @mcast_list: the list to free + * + * Removes and frees all items in the given mcast_list. + */ +static void batadv_mcast_mla_list_free(struct hlist_head *mcast_list) +{ + struct batadv_hw_addr *mcast_entry; + struct hlist_node *tmp; + + hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { + hlist_del(&mcast_entry->list); + kfree(mcast_entry); + } +} + +/** + * batadv_mcast_mla_tt_retract() - clean up multicast listener announcements + * @bat_priv: the bat priv with all the soft interface information + * @mcast_list: a list of addresses which should _not_ be removed + * + * Retracts the announcement of any multicast listener from the + * translation table except the ones listed in the given mcast_list. + * + * If mcast_list is NULL then all are retracted. + */ +static void batadv_mcast_mla_tt_retract(struct batadv_priv *bat_priv, + struct hlist_head *mcast_list) +{ + struct batadv_hw_addr *mcast_entry; + struct hlist_node *tmp; + + hlist_for_each_entry_safe(mcast_entry, tmp, &bat_priv->mcast.mla_list, + list) { + if (mcast_list && + batadv_mcast_mla_is_duplicate(mcast_entry->addr, + mcast_list)) + continue; + + batadv_tt_local_remove(bat_priv, mcast_entry->addr, + BATADV_NO_FLAGS, + "mcast TT outdated", false); + + hlist_del(&mcast_entry->list); + kfree(mcast_entry); + } +} + +/** + * batadv_mcast_mla_tt_add() - add multicast listener announcements + * @bat_priv: the bat priv with all the soft interface information + * @mcast_list: a list of addresses which are going to get added + * + * Adds multicast listener announcements from the given mcast_list to the + * translation table if they have not been added yet. + */ +static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv, + struct hlist_head *mcast_list) +{ + struct batadv_hw_addr *mcast_entry; + struct hlist_node *tmp; + + if (!mcast_list) + return; + + hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { + if (batadv_mcast_mla_is_duplicate(mcast_entry->addr, + &bat_priv->mcast.mla_list)) + continue; + + if (!batadv_tt_local_add(bat_priv->soft_iface, + mcast_entry->addr, BATADV_NO_FLAGS, + BATADV_NULL_IFINDEX, BATADV_NO_MARK)) + continue; + + hlist_del(&mcast_entry->list); + hlist_add_head(&mcast_entry->list, &bat_priv->mcast.mla_list); + } +} + +/** + * batadv_mcast_querier_log() - debug output regarding the querier status on + * link + * @bat_priv: the bat priv with all the soft interface information + * @str_proto: a string for the querier protocol (e.g. "IGMP" or "MLD") + * @old_state: the previous querier state on our link + * @new_state: the new querier state on our link + * + * Outputs debug messages to the logging facility with log level 'mcast' + * regarding changes to the querier status on the link which are relevant + * to our multicast optimizations. + * + * Usually this is about whether a querier appeared or vanished in + * our mesh or whether the querier is in the suboptimal position of being + * behind our local bridge segment: Snooping switches will directly + * forward listener reports to the querier, therefore batman-adv and + * the bridge will potentially not see these listeners - the querier is + * potentially shadowing listeners from us then. + * + * This is only interesting for nodes with a bridge on top of their + * soft interface. + */ +static void +batadv_mcast_querier_log(struct batadv_priv *bat_priv, char *str_proto, + struct batadv_mcast_querier_state *old_state, + struct batadv_mcast_querier_state *new_state) +{ + if (!old_state->exists && new_state->exists) + batadv_info(bat_priv->soft_iface, "%s Querier appeared\n", + str_proto); + else if (old_state->exists && !new_state->exists) + batadv_info(bat_priv->soft_iface, + "%s Querier disappeared - multicast optimizations disabled\n", + str_proto); + else if (!bat_priv->mcast.mla_flags.bridged && !new_state->exists) + batadv_info(bat_priv->soft_iface, + "No %s Querier present - multicast optimizations disabled\n", + str_proto); + + if (new_state->exists) { + if ((!old_state->shadowing && new_state->shadowing) || + (!old_state->exists && new_state->shadowing)) + batadv_dbg(BATADV_DBG_MCAST, bat_priv, + "%s Querier is behind our bridged segment: Might shadow listeners\n", + str_proto); + else if (old_state->shadowing && !new_state->shadowing) + batadv_dbg(BATADV_DBG_MCAST, bat_priv, + "%s Querier is not behind our bridged segment\n", + str_proto); + } +} + +/** + * batadv_mcast_bridge_log() - debug output for topology changes in bridged + * setups + * @bat_priv: the bat priv with all the soft interface information + * @new_flags: flags indicating the new multicast state + * + * If no bridges are ever used on this node, then this function does nothing. + * + * Otherwise this function outputs debug information to the 'mcast' log level + * which might be relevant to our multicast optimizations. + * + * More precisely, it outputs information when a bridge interface is added or + * removed from a soft interface. And when a bridge is present, it further + * outputs information about the querier state which is relevant for the + * multicast flags this node is going to set. + */ +static void +batadv_mcast_bridge_log(struct batadv_priv *bat_priv, + struct batadv_mcast_mla_flags *new_flags) +{ + struct batadv_mcast_mla_flags *old_flags = &bat_priv->mcast.mla_flags; + + if (!old_flags->bridged && new_flags->bridged) + batadv_dbg(BATADV_DBG_MCAST, bat_priv, + "Bridge added: Setting Unsnoopables(U)-flag\n"); + else if (old_flags->bridged && !new_flags->bridged) + batadv_dbg(BATADV_DBG_MCAST, bat_priv, + "Bridge removed: Unsetting Unsnoopables(U)-flag\n"); + + if (new_flags->bridged) { + batadv_mcast_querier_log(bat_priv, "IGMP", + &old_flags->querier_ipv4, + &new_flags->querier_ipv4); + batadv_mcast_querier_log(bat_priv, "MLD", + &old_flags->querier_ipv6, + &new_flags->querier_ipv6); + } +} + +/** + * batadv_mcast_flags_log() - output debug information about mcast flag changes + * @bat_priv: the bat priv with all the soft interface information + * @flags: TVLV flags indicating the new multicast state + * + * Whenever the multicast TVLV flags this node announces change, this function + * should be used to notify userspace about the change. + */ +static void batadv_mcast_flags_log(struct batadv_priv *bat_priv, u8 flags) +{ + bool old_enabled = bat_priv->mcast.mla_flags.enabled; + u8 old_flags = bat_priv->mcast.mla_flags.tvlv_flags; + char str_old_flags[] = "[.... . ]"; + + sprintf(str_old_flags, "[%c%c%c%s%s]", + (old_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.', + (old_flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.', + (old_flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.', + !(old_flags & BATADV_MCAST_WANT_NO_RTR4) ? "R4" : ". ", + !(old_flags & BATADV_MCAST_WANT_NO_RTR6) ? "R6" : ". "); + + batadv_dbg(BATADV_DBG_MCAST, bat_priv, + "Changing multicast flags from '%s' to '[%c%c%c%s%s]'\n", + old_enabled ? str_old_flags : "<undefined>", + (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.', + (flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.', + (flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.', + !(flags & BATADV_MCAST_WANT_NO_RTR4) ? "R4" : ". ", + !(flags & BATADV_MCAST_WANT_NO_RTR6) ? "R6" : ". "); +} + +/** + * batadv_mcast_mla_flags_update() - update multicast flags + * @bat_priv: the bat priv with all the soft interface information + * @flags: flags indicating the new multicast state + * + * Updates the own multicast tvlv with our current multicast related settings, + * capabilities and inabilities. + */ +static void +batadv_mcast_mla_flags_update(struct batadv_priv *bat_priv, + struct batadv_mcast_mla_flags *flags) +{ + struct batadv_tvlv_mcast_data mcast_data; + + if (!memcmp(flags, &bat_priv->mcast.mla_flags, sizeof(*flags))) + return; + + batadv_mcast_bridge_log(bat_priv, flags); + batadv_mcast_flags_log(bat_priv, flags->tvlv_flags); + + mcast_data.flags = flags->tvlv_flags; + memset(mcast_data.reserved, 0, sizeof(mcast_data.reserved)); + + batadv_tvlv_container_register(bat_priv, BATADV_TVLV_MCAST, 2, + &mcast_data, sizeof(mcast_data)); + + bat_priv->mcast.mla_flags = *flags; +} + +/** + * __batadv_mcast_mla_update() - update the own MLAs + * @bat_priv: the bat priv with all the soft interface information + * + * Updates the own multicast listener announcements in the translation + * table as well as the own, announced multicast tvlv container. + * + * Note that non-conflicting reads and writes to bat_priv->mcast.mla_list + * in batadv_mcast_mla_tt_retract() and batadv_mcast_mla_tt_add() are + * ensured by the non-parallel execution of the worker this function + * belongs to. + */ +static void __batadv_mcast_mla_update(struct batadv_priv *bat_priv) +{ + struct net_device *soft_iface = bat_priv->soft_iface; + struct hlist_head mcast_list = HLIST_HEAD_INIT; + struct batadv_mcast_mla_flags flags; + int ret; + + flags = batadv_mcast_mla_flags_get(bat_priv); + + ret = batadv_mcast_mla_softif_get(soft_iface, &mcast_list, &flags); + if (ret < 0) + goto out; + + ret = batadv_mcast_mla_bridge_get(soft_iface, &mcast_list, &flags); + if (ret < 0) + goto out; + + spin_lock(&bat_priv->mcast.mla_lock); + batadv_mcast_mla_tt_retract(bat_priv, &mcast_list); + batadv_mcast_mla_tt_add(bat_priv, &mcast_list); + batadv_mcast_mla_flags_update(bat_priv, &flags); + spin_unlock(&bat_priv->mcast.mla_lock); + +out: + batadv_mcast_mla_list_free(&mcast_list); +} + +/** + * batadv_mcast_mla_update() - update the own MLAs + * @work: kernel work struct + * + * Updates the own multicast listener announcements in the translation + * table as well as the own, announced multicast tvlv container. + * + * In the end, reschedules the work timer. + */ +static void batadv_mcast_mla_update(struct work_struct *work) +{ + struct delayed_work *delayed_work; + struct batadv_priv_mcast *priv_mcast; + struct batadv_priv *bat_priv; + + delayed_work = to_delayed_work(work); + priv_mcast = container_of(delayed_work, struct batadv_priv_mcast, work); + bat_priv = container_of(priv_mcast, struct batadv_priv, mcast); + + __batadv_mcast_mla_update(bat_priv); + batadv_mcast_start_timer(bat_priv); +} + +/** + * batadv_mcast_is_report_ipv4() - check for IGMP reports + * @skb: the ethernet frame destined for the mesh + * + * This call might reallocate skb data. + * + * Checks whether the given frame is a valid IGMP report. + * + * Return: If so then true, otherwise false. + */ +static bool batadv_mcast_is_report_ipv4(struct sk_buff *skb) +{ + if (ip_mc_check_igmp(skb) < 0) + return false; + + switch (igmp_hdr(skb)->type) { + case IGMP_HOST_MEMBERSHIP_REPORT: + case IGMPV2_HOST_MEMBERSHIP_REPORT: + case IGMPV3_HOST_MEMBERSHIP_REPORT: + return true; + } + + return false; +} + +/** + * batadv_mcast_forw_mode_check_ipv4() - check for optimized forwarding + * potential + * @bat_priv: the bat priv with all the soft interface information + * @skb: the IPv4 packet to check + * @is_unsnoopable: stores whether the destination is snoopable + * @is_routable: stores whether the destination is routable + * + * Checks whether the given IPv4 packet has the potential to be forwarded with a + * mode more optimal than classic flooding. + * + * Return: If so then 0. Otherwise -EINVAL or -ENOMEM in case of memory + * allocation failure. + */ +static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv, + struct sk_buff *skb, + bool *is_unsnoopable, + int *is_routable) +{ + struct iphdr *iphdr; + + /* We might fail due to out-of-memory -> drop it */ + if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*iphdr))) + return -ENOMEM; + + if (batadv_mcast_is_report_ipv4(skb)) + return -EINVAL; + + iphdr = ip_hdr(skb); + + /* link-local multicast listeners behind a bridge are + * not snoopable (see RFC4541, section 2.1.2.2) + */ + if (ipv4_is_local_multicast(iphdr->daddr)) + *is_unsnoopable = true; + else + *is_routable = ETH_P_IP; + + return 0; +} + +/** + * batadv_mcast_is_report_ipv6() - check for MLD reports + * @skb: the ethernet frame destined for the mesh + * + * This call might reallocate skb data. + * + * Checks whether the given frame is a valid MLD report. + * + * Return: If so then true, otherwise false. + */ +static bool batadv_mcast_is_report_ipv6(struct sk_buff *skb) +{ + if (ipv6_mc_check_mld(skb) < 0) + return false; + + switch (icmp6_hdr(skb)->icmp6_type) { + case ICMPV6_MGM_REPORT: + case ICMPV6_MLD2_REPORT: + return true; + } + + return false; +} + +/** + * batadv_mcast_forw_mode_check_ipv6() - check for optimized forwarding + * potential + * @bat_priv: the bat priv with all the soft interface information + * @skb: the IPv6 packet to check + * @is_unsnoopable: stores whether the destination is snoopable + * @is_routable: stores whether the destination is routable + * + * Checks whether the given IPv6 packet has the potential to be forwarded with a + * mode more optimal than classic flooding. + * + * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory + */ +static int batadv_mcast_forw_mode_check_ipv6(struct batadv_priv *bat_priv, + struct sk_buff *skb, + bool *is_unsnoopable, + int *is_routable) +{ + struct ipv6hdr *ip6hdr; + + /* We might fail due to out-of-memory -> drop it */ + if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*ip6hdr))) + return -ENOMEM; + + if (batadv_mcast_is_report_ipv6(skb)) + return -EINVAL; + + ip6hdr = ipv6_hdr(skb); + + if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) < IPV6_ADDR_SCOPE_LINKLOCAL) + return -EINVAL; + + /* link-local-all-nodes multicast listeners behind a bridge are + * not snoopable (see RFC4541, section 3, paragraph 3) + */ + if (ipv6_addr_is_ll_all_nodes(&ip6hdr->daddr)) + *is_unsnoopable = true; + else if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) > IPV6_ADDR_SCOPE_LINKLOCAL) + *is_routable = ETH_P_IPV6; + + return 0; +} + +/** + * batadv_mcast_forw_mode_check() - check for optimized forwarding potential + * @bat_priv: the bat priv with all the soft interface information + * @skb: the multicast frame to check + * @is_unsnoopable: stores whether the destination is snoopable + * @is_routable: stores whether the destination is routable + * + * Checks whether the given multicast ethernet frame has the potential to be + * forwarded with a mode more optimal than classic flooding. + * + * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory + */ +static int batadv_mcast_forw_mode_check(struct batadv_priv *bat_priv, + struct sk_buff *skb, + bool *is_unsnoopable, + int *is_routable) +{ + struct ethhdr *ethhdr = eth_hdr(skb); + + if (!atomic_read(&bat_priv->multicast_mode)) + return -EINVAL; + + switch (ntohs(ethhdr->h_proto)) { + case ETH_P_IP: + return batadv_mcast_forw_mode_check_ipv4(bat_priv, skb, + is_unsnoopable, + is_routable); + case ETH_P_IPV6: + if (!IS_ENABLED(CONFIG_IPV6)) + return -EINVAL; + + return batadv_mcast_forw_mode_check_ipv6(bat_priv, skb, + is_unsnoopable, + is_routable); + default: + return -EINVAL; + } +} + +/** + * batadv_mcast_forw_want_all_ip_count() - count nodes with unspecific mcast + * interest + * @bat_priv: the bat priv with all the soft interface information + * @ethhdr: ethernet header of a packet + * + * Return: the number of nodes which want all IPv4 multicast traffic if the + * given ethhdr is from an IPv4 packet or the number of nodes which want all + * IPv6 traffic if it matches an IPv6 packet. + */ +static int batadv_mcast_forw_want_all_ip_count(struct batadv_priv *bat_priv, + struct ethhdr *ethhdr) +{ + switch (ntohs(ethhdr->h_proto)) { + case ETH_P_IP: + return atomic_read(&bat_priv->mcast.num_want_all_ipv4); + case ETH_P_IPV6: + return atomic_read(&bat_priv->mcast.num_want_all_ipv6); + default: + /* we shouldn't be here... */ + return 0; + } +} + +/** + * batadv_mcast_forw_rtr_count() - count nodes with a multicast router + * @bat_priv: the bat priv with all the soft interface information + * @protocol: the ethernet protocol type to count multicast routers for + * + * Return: the number of nodes which want all routable IPv4 multicast traffic + * if the protocol is ETH_P_IP or the number of nodes which want all routable + * IPv6 traffic if the protocol is ETH_P_IPV6. Otherwise returns 0. + */ + +static int batadv_mcast_forw_rtr_count(struct batadv_priv *bat_priv, + int protocol) +{ + switch (protocol) { + case ETH_P_IP: + return atomic_read(&bat_priv->mcast.num_want_all_rtr4); + case ETH_P_IPV6: + return atomic_read(&bat_priv->mcast.num_want_all_rtr6); + default: + return 0; + } +} + +/** + * batadv_mcast_forw_tt_node_get() - get a multicast tt node + * @bat_priv: the bat priv with all the soft interface information + * @ethhdr: the ether header containing the multicast destination + * + * Return: an orig_node matching the multicast address provided by ethhdr + * via a translation table lookup. This increases the returned nodes refcount. + */ +static struct batadv_orig_node * +batadv_mcast_forw_tt_node_get(struct batadv_priv *bat_priv, + struct ethhdr *ethhdr) +{ + return batadv_transtable_search(bat_priv, NULL, ethhdr->h_dest, + BATADV_NO_FLAGS); +} + +/** + * batadv_mcast_forw_ipv4_node_get() - get a node with an ipv4 flag + * @bat_priv: the bat priv with all the soft interface information + * + * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 flag set and + * increases its refcount. + */ +static struct batadv_orig_node * +batadv_mcast_forw_ipv4_node_get(struct batadv_priv *bat_priv) +{ + struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; + + rcu_read_lock(); + hlist_for_each_entry_rcu(tmp_orig_node, + &bat_priv->mcast.want_all_ipv4_list, + mcast_want_all_ipv4_node) { + if (!kref_get_unless_zero(&tmp_orig_node->refcount)) + continue; + + orig_node = tmp_orig_node; + break; + } + rcu_read_unlock(); + + return orig_node; +} + +/** + * batadv_mcast_forw_ipv6_node_get() - get a node with an ipv6 flag + * @bat_priv: the bat priv with all the soft interface information + * + * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV6 flag set + * and increases its refcount. + */ +static struct batadv_orig_node * +batadv_mcast_forw_ipv6_node_get(struct batadv_priv *bat_priv) +{ + struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; + + rcu_read_lock(); + hlist_for_each_entry_rcu(tmp_orig_node, + &bat_priv->mcast.want_all_ipv6_list, + mcast_want_all_ipv6_node) { + if (!kref_get_unless_zero(&tmp_orig_node->refcount)) + continue; + + orig_node = tmp_orig_node; + break; + } + rcu_read_unlock(); + + return orig_node; +} + +/** + * batadv_mcast_forw_ip_node_get() - get a node with an ipv4/ipv6 flag + * @bat_priv: the bat priv with all the soft interface information + * @ethhdr: an ethernet header to determine the protocol family from + * + * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 or + * BATADV_MCAST_WANT_ALL_IPV6 flag, depending on the provided ethhdr, sets and + * increases its refcount. + */ +static struct batadv_orig_node * +batadv_mcast_forw_ip_node_get(struct batadv_priv *bat_priv, + struct ethhdr *ethhdr) +{ + switch (ntohs(ethhdr->h_proto)) { + case ETH_P_IP: + return batadv_mcast_forw_ipv4_node_get(bat_priv); + case ETH_P_IPV6: + return batadv_mcast_forw_ipv6_node_get(bat_priv); + default: + /* we shouldn't be here... */ + return NULL; + } +} + +/** + * batadv_mcast_forw_unsnoop_node_get() - get a node with an unsnoopable flag + * @bat_priv: the bat priv with all the soft interface information + * + * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag + * set and increases its refcount. + */ +static struct batadv_orig_node * +batadv_mcast_forw_unsnoop_node_get(struct batadv_priv *bat_priv) +{ + struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; + + rcu_read_lock(); + hlist_for_each_entry_rcu(tmp_orig_node, + &bat_priv->mcast.want_all_unsnoopables_list, + mcast_want_all_unsnoopables_node) { + if (!kref_get_unless_zero(&tmp_orig_node->refcount)) + continue; + + orig_node = tmp_orig_node; + break; + } + rcu_read_unlock(); + + return orig_node; +} + +/** + * batadv_mcast_forw_rtr4_node_get() - get a node with an ipv4 mcast router flag + * @bat_priv: the bat priv with all the soft interface information + * + * Return: an orig_node which has the BATADV_MCAST_WANT_NO_RTR4 flag unset and + * increases its refcount. + */ +static struct batadv_orig_node * +batadv_mcast_forw_rtr4_node_get(struct batadv_priv *bat_priv) +{ + struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; + + rcu_read_lock(); + hlist_for_each_entry_rcu(tmp_orig_node, + &bat_priv->mcast.want_all_rtr4_list, + mcast_want_all_rtr4_node) { + if (!kref_get_unless_zero(&tmp_orig_node->refcount)) + continue; + + orig_node = tmp_orig_node; + break; + } + rcu_read_unlock(); + + return orig_node; +} + +/** + * batadv_mcast_forw_rtr6_node_get() - get a node with an ipv6 mcast router flag + * @bat_priv: the bat priv with all the soft interface information + * + * Return: an orig_node which has the BATADV_MCAST_WANT_NO_RTR6 flag unset + * and increases its refcount. + */ +static struct batadv_orig_node * +batadv_mcast_forw_rtr6_node_get(struct batadv_priv *bat_priv) +{ + struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; + + rcu_read_lock(); + hlist_for_each_entry_rcu(tmp_orig_node, + &bat_priv->mcast.want_all_rtr6_list, + mcast_want_all_rtr6_node) { + if (!kref_get_unless_zero(&tmp_orig_node->refcount)) + continue; + + orig_node = tmp_orig_node; + break; + } + rcu_read_unlock(); + + return orig_node; +} + +/** + * batadv_mcast_forw_rtr_node_get() - get a node with an ipv4/ipv6 router flag + * @bat_priv: the bat priv with all the soft interface information + * @ethhdr: an ethernet header to determine the protocol family from + * + * Return: an orig_node which has no BATADV_MCAST_WANT_NO_RTR4 or + * BATADV_MCAST_WANT_NO_RTR6 flag, depending on the provided ethhdr, set and + * increases its refcount. + */ +static struct batadv_orig_node * +batadv_mcast_forw_rtr_node_get(struct batadv_priv *bat_priv, + struct ethhdr *ethhdr) +{ + switch (ntohs(ethhdr->h_proto)) { + case ETH_P_IP: + return batadv_mcast_forw_rtr4_node_get(bat_priv); + case ETH_P_IPV6: + return batadv_mcast_forw_rtr6_node_get(bat_priv); + default: + /* we shouldn't be here... */ + return NULL; + } +} + +/** + * batadv_mcast_forw_mode() - check on how to forward a multicast packet + * @bat_priv: the bat priv with all the soft interface information + * @skb: The multicast packet to check + * @orig: an originator to be set to forward the skb to + * @is_routable: stores whether the destination is routable + * + * Return: the forwarding mode as enum batadv_forw_mode and in case of + * BATADV_FORW_SINGLE set the orig to the single originator the skb + * should be forwarded to. + */ +enum batadv_forw_mode +batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb, + struct batadv_orig_node **orig, int *is_routable) +{ + int ret, tt_count, ip_count, unsnoop_count, total_count; + bool is_unsnoopable = false; + unsigned int mcast_fanout; + struct ethhdr *ethhdr; + int rtr_count = 0; + + ret = batadv_mcast_forw_mode_check(bat_priv, skb, &is_unsnoopable, + is_routable); + if (ret == -ENOMEM) + return BATADV_FORW_NONE; + else if (ret < 0) + return BATADV_FORW_ALL; + + ethhdr = eth_hdr(skb); + + tt_count = batadv_tt_global_hash_count(bat_priv, ethhdr->h_dest, + BATADV_NO_FLAGS); + ip_count = batadv_mcast_forw_want_all_ip_count(bat_priv, ethhdr); + unsnoop_count = !is_unsnoopable ? 0 : + atomic_read(&bat_priv->mcast.num_want_all_unsnoopables); + rtr_count = batadv_mcast_forw_rtr_count(bat_priv, *is_routable); + + total_count = tt_count + ip_count + unsnoop_count + rtr_count; + + switch (total_count) { + case 1: + if (tt_count) + *orig = batadv_mcast_forw_tt_node_get(bat_priv, ethhdr); + else if (ip_count) + *orig = batadv_mcast_forw_ip_node_get(bat_priv, ethhdr); + else if (unsnoop_count) + *orig = batadv_mcast_forw_unsnoop_node_get(bat_priv); + else if (rtr_count) + *orig = batadv_mcast_forw_rtr_node_get(bat_priv, + ethhdr); + + if (*orig) + return BATADV_FORW_SINGLE; + + fallthrough; + case 0: + return BATADV_FORW_NONE; + default: + mcast_fanout = atomic_read(&bat_priv->multicast_fanout); + + if (!unsnoop_count && total_count <= mcast_fanout) + return BATADV_FORW_SOME; + } + + return BATADV_FORW_ALL; +} + +/** + * batadv_mcast_forw_send_orig() - send a multicast packet to an originator + * @bat_priv: the bat priv with all the soft interface information + * @skb: the multicast packet to send + * @vid: the vlan identifier + * @orig_node: the originator to send the packet to + * + * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. + */ +int batadv_mcast_forw_send_orig(struct batadv_priv *bat_priv, + struct sk_buff *skb, + unsigned short vid, + struct batadv_orig_node *orig_node) +{ + /* Avoid sending multicast-in-unicast packets to other BLA + * gateways - they already got the frame from the LAN side + * we share with them. + * TODO: Refactor to take BLA into account earlier, to avoid + * reducing the mcast_fanout count. + */ + if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid)) { + dev_kfree_skb(skb); + return NET_XMIT_SUCCESS; + } + + return batadv_send_skb_unicast(bat_priv, skb, BATADV_UNICAST, 0, + orig_node, vid); +} + +/** + * batadv_mcast_forw_tt() - forwards a packet to multicast listeners + * @bat_priv: the bat priv with all the soft interface information + * @skb: the multicast packet to transmit + * @vid: the vlan identifier + * + * Sends copies of a frame with multicast destination to any multicast + * listener registered in the translation table. A transmission is performed + * via a batman-adv unicast packet for each such destination node. + * + * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS + * otherwise. + */ +static int +batadv_mcast_forw_tt(struct batadv_priv *bat_priv, struct sk_buff *skb, + unsigned short vid) +{ + int ret = NET_XMIT_SUCCESS; + struct sk_buff *newskb; + + struct batadv_tt_orig_list_entry *orig_entry; + + struct batadv_tt_global_entry *tt_global; + const u8 *addr = eth_hdr(skb)->h_dest; + + tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid); + if (!tt_global) + goto out; + + rcu_read_lock(); + hlist_for_each_entry_rcu(orig_entry, &tt_global->orig_list, list) { + newskb = skb_copy(skb, GFP_ATOMIC); + if (!newskb) { + ret = NET_XMIT_DROP; + break; + } + + batadv_mcast_forw_send_orig(bat_priv, newskb, vid, + orig_entry->orig_node); + } + rcu_read_unlock(); + + batadv_tt_global_entry_put(tt_global); + +out: + return ret; +} + +/** + * batadv_mcast_forw_want_all_ipv4() - forward to nodes with want-all-ipv4 + * @bat_priv: the bat priv with all the soft interface information + * @skb: the multicast packet to transmit + * @vid: the vlan identifier + * + * Sends copies of a frame with multicast destination to any node with a + * BATADV_MCAST_WANT_ALL_IPV4 flag set. A transmission is performed via a + * batman-adv unicast packet for each such destination node. + * + * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS + * otherwise. + */ +static int +batadv_mcast_forw_want_all_ipv4(struct batadv_priv *bat_priv, + struct sk_buff *skb, unsigned short vid) +{ + struct batadv_orig_node *orig_node; + int ret = NET_XMIT_SUCCESS; + struct sk_buff *newskb; + + rcu_read_lock(); + hlist_for_each_entry_rcu(orig_node, + &bat_priv->mcast.want_all_ipv4_list, + mcast_want_all_ipv4_node) { + newskb = skb_copy(skb, GFP_ATOMIC); + if (!newskb) { + ret = NET_XMIT_DROP; + break; + } + + batadv_mcast_forw_send_orig(bat_priv, newskb, vid, orig_node); + } + rcu_read_unlock(); + return ret; +} + +/** + * batadv_mcast_forw_want_all_ipv6() - forward to nodes with want-all-ipv6 + * @bat_priv: the bat priv with all the soft interface information + * @skb: The multicast packet to transmit + * @vid: the vlan identifier + * + * Sends copies of a frame with multicast destination to any node with a + * BATADV_MCAST_WANT_ALL_IPV6 flag set. A transmission is performed via a + * batman-adv unicast packet for each such destination node. + * + * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS + * otherwise. + */ +static int +batadv_mcast_forw_want_all_ipv6(struct batadv_priv *bat_priv, + struct sk_buff *skb, unsigned short vid) +{ + struct batadv_orig_node *orig_node; + int ret = NET_XMIT_SUCCESS; + struct sk_buff *newskb; + + rcu_read_lock(); + hlist_for_each_entry_rcu(orig_node, + &bat_priv->mcast.want_all_ipv6_list, + mcast_want_all_ipv6_node) { + newskb = skb_copy(skb, GFP_ATOMIC); + if (!newskb) { + ret = NET_XMIT_DROP; + break; + } + + batadv_mcast_forw_send_orig(bat_priv, newskb, vid, orig_node); + } + rcu_read_unlock(); + return ret; +} + +/** + * batadv_mcast_forw_want_all() - forward packet to nodes in a want-all list + * @bat_priv: the bat priv with all the soft interface information + * @skb: the multicast packet to transmit + * @vid: the vlan identifier + * + * Sends copies of a frame with multicast destination to any node with a + * BATADV_MCAST_WANT_ALL_IPV4 or BATADV_MCAST_WANT_ALL_IPV6 flag set. A + * transmission is performed via a batman-adv unicast packet for each such + * destination node. + * + * Return: NET_XMIT_DROP on memory allocation failure or if the protocol family + * is neither IPv4 nor IPv6. NET_XMIT_SUCCESS otherwise. + */ +static int +batadv_mcast_forw_want_all(struct batadv_priv *bat_priv, + struct sk_buff *skb, unsigned short vid) +{ + switch (ntohs(eth_hdr(skb)->h_proto)) { + case ETH_P_IP: + return batadv_mcast_forw_want_all_ipv4(bat_priv, skb, vid); + case ETH_P_IPV6: + return batadv_mcast_forw_want_all_ipv6(bat_priv, skb, vid); + default: + /* we shouldn't be here... */ + return NET_XMIT_DROP; + } +} + +/** + * batadv_mcast_forw_want_all_rtr4() - forward to nodes with want-all-rtr4 + * @bat_priv: the bat priv with all the soft interface information + * @skb: the multicast packet to transmit + * @vid: the vlan identifier + * + * Sends copies of a frame with multicast destination to any node with a + * BATADV_MCAST_WANT_NO_RTR4 flag unset. A transmission is performed via a + * batman-adv unicast packet for each such destination node. + * + * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS + * otherwise. + */ +static int +batadv_mcast_forw_want_all_rtr4(struct batadv_priv *bat_priv, + struct sk_buff *skb, unsigned short vid) +{ + struct batadv_orig_node *orig_node; + int ret = NET_XMIT_SUCCESS; + struct sk_buff *newskb; + + rcu_read_lock(); + hlist_for_each_entry_rcu(orig_node, + &bat_priv->mcast.want_all_rtr4_list, + mcast_want_all_rtr4_node) { + newskb = skb_copy(skb, GFP_ATOMIC); + if (!newskb) { + ret = NET_XMIT_DROP; + break; + } + + batadv_mcast_forw_send_orig(bat_priv, newskb, vid, orig_node); + } + rcu_read_unlock(); + return ret; +} + +/** + * batadv_mcast_forw_want_all_rtr6() - forward to nodes with want-all-rtr6 + * @bat_priv: the bat priv with all the soft interface information + * @skb: The multicast packet to transmit + * @vid: the vlan identifier + * + * Sends copies of a frame with multicast destination to any node with a + * BATADV_MCAST_WANT_NO_RTR6 flag unset. A transmission is performed via a + * batman-adv unicast packet for each such destination node. + * + * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS + * otherwise. + */ +static int +batadv_mcast_forw_want_all_rtr6(struct batadv_priv *bat_priv, + struct sk_buff *skb, unsigned short vid) +{ + struct batadv_orig_node *orig_node; + int ret = NET_XMIT_SUCCESS; + struct sk_buff *newskb; + + rcu_read_lock(); + hlist_for_each_entry_rcu(orig_node, + &bat_priv->mcast.want_all_rtr6_list, + mcast_want_all_rtr6_node) { + newskb = skb_copy(skb, GFP_ATOMIC); + if (!newskb) { + ret = NET_XMIT_DROP; + break; + } + + batadv_mcast_forw_send_orig(bat_priv, newskb, vid, orig_node); + } + rcu_read_unlock(); + return ret; +} + +/** + * batadv_mcast_forw_want_rtr() - forward packet to nodes in a want-all-rtr list + * @bat_priv: the bat priv with all the soft interface information + * @skb: the multicast packet to transmit + * @vid: the vlan identifier + * + * Sends copies of a frame with multicast destination to any node with a + * BATADV_MCAST_WANT_NO_RTR4 or BATADV_MCAST_WANT_NO_RTR6 flag unset. A + * transmission is performed via a batman-adv unicast packet for each such + * destination node. + * + * Return: NET_XMIT_DROP on memory allocation failure or if the protocol family + * is neither IPv4 nor IPv6. NET_XMIT_SUCCESS otherwise. + */ +static int +batadv_mcast_forw_want_rtr(struct batadv_priv *bat_priv, + struct sk_buff *skb, unsigned short vid) +{ + switch (ntohs(eth_hdr(skb)->h_proto)) { + case ETH_P_IP: + return batadv_mcast_forw_want_all_rtr4(bat_priv, skb, vid); + case ETH_P_IPV6: + return batadv_mcast_forw_want_all_rtr6(bat_priv, skb, vid); + default: + /* we shouldn't be here... */ + return NET_XMIT_DROP; + } +} + +/** + * batadv_mcast_forw_send() - send packet to any detected multicast recipient + * @bat_priv: the bat priv with all the soft interface information + * @skb: the multicast packet to transmit + * @vid: the vlan identifier + * @is_routable: stores whether the destination is routable + * + * Sends copies of a frame with multicast destination to any node that signaled + * interest in it, that is either via the translation table or the according + * want-all flags. A transmission is performed via a batman-adv unicast packet + * for each such destination node. + * + * The given skb is consumed/freed. + * + * Return: NET_XMIT_DROP on memory allocation failure or if the protocol family + * is neither IPv4 nor IPv6. NET_XMIT_SUCCESS otherwise. + */ +int batadv_mcast_forw_send(struct batadv_priv *bat_priv, struct sk_buff *skb, + unsigned short vid, int is_routable) +{ + int ret; + + ret = batadv_mcast_forw_tt(bat_priv, skb, vid); + if (ret != NET_XMIT_SUCCESS) { + kfree_skb(skb); + return ret; + } + + ret = batadv_mcast_forw_want_all(bat_priv, skb, vid); + if (ret != NET_XMIT_SUCCESS) { + kfree_skb(skb); + return ret; + } + + if (!is_routable) + goto skip_mc_router; + + ret = batadv_mcast_forw_want_rtr(bat_priv, skb, vid); + if (ret != NET_XMIT_SUCCESS) { + kfree_skb(skb); + return ret; + } + +skip_mc_router: + consume_skb(skb); + return ret; +} + +/** + * batadv_mcast_want_unsnoop_update() - update unsnoop counter and list + * @bat_priv: the bat priv with all the soft interface information + * @orig: the orig_node which multicast state might have changed of + * @mcast_flags: flags indicating the new multicast state + * + * If the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag of this originator, + * orig, has toggled then this method updates the counter and the list + * accordingly. + * + * Caller needs to hold orig->mcast_handler_lock. + */ +static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig, + u8 mcast_flags) +{ + struct hlist_node *node = &orig->mcast_want_all_unsnoopables_node; + struct hlist_head *head = &bat_priv->mcast.want_all_unsnoopables_list; + + lockdep_assert_held(&orig->mcast_handler_lock); + + /* switched from flag unset to set */ + if (mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && + !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)) { + atomic_inc(&bat_priv->mcast.num_want_all_unsnoopables); + + spin_lock_bh(&bat_priv->mcast.want_lists_lock); + /* flag checks above + mcast_handler_lock prevents this */ + WARN_ON(!hlist_unhashed(node)); + + hlist_add_head_rcu(node, head); + spin_unlock_bh(&bat_priv->mcast.want_lists_lock); + /* switched from flag set to unset */ + } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) && + orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) { + atomic_dec(&bat_priv->mcast.num_want_all_unsnoopables); + + spin_lock_bh(&bat_priv->mcast.want_lists_lock); + /* flag checks above + mcast_handler_lock prevents this */ + WARN_ON(hlist_unhashed(node)); + + hlist_del_init_rcu(node); + spin_unlock_bh(&bat_priv->mcast.want_lists_lock); + } +} + +/** + * batadv_mcast_want_ipv4_update() - update want-all-ipv4 counter and list + * @bat_priv: the bat priv with all the soft interface information + * @orig: the orig_node which multicast state might have changed of + * @mcast_flags: flags indicating the new multicast state + * + * If the BATADV_MCAST_WANT_ALL_IPV4 flag of this originator, orig, has + * toggled then this method updates the counter and the list accordingly. + * + * Caller needs to hold orig->mcast_handler_lock. + */ +static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig, + u8 mcast_flags) +{ + struct hlist_node *node = &orig->mcast_want_all_ipv4_node; + struct hlist_head *head = &bat_priv->mcast.want_all_ipv4_list; + + lockdep_assert_held(&orig->mcast_handler_lock); + + /* switched from flag unset to set */ + if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4 && + !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)) { + atomic_inc(&bat_priv->mcast.num_want_all_ipv4); + + spin_lock_bh(&bat_priv->mcast.want_lists_lock); + /* flag checks above + mcast_handler_lock prevents this */ + WARN_ON(!hlist_unhashed(node)); + + hlist_add_head_rcu(node, head); + spin_unlock_bh(&bat_priv->mcast.want_lists_lock); + /* switched from flag set to unset */ + } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) && + orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) { + atomic_dec(&bat_priv->mcast.num_want_all_ipv4); + + spin_lock_bh(&bat_priv->mcast.want_lists_lock); + /* flag checks above + mcast_handler_lock prevents this */ + WARN_ON(hlist_unhashed(node)); + + hlist_del_init_rcu(node); + spin_unlock_bh(&bat_priv->mcast.want_lists_lock); + } +} + +/** + * batadv_mcast_want_ipv6_update() - update want-all-ipv6 counter and list + * @bat_priv: the bat priv with all the soft interface information + * @orig: the orig_node which multicast state might have changed of + * @mcast_flags: flags indicating the new multicast state + * + * If the BATADV_MCAST_WANT_ALL_IPV6 flag of this originator, orig, has + * toggled then this method updates the counter and the list accordingly. + * + * Caller needs to hold orig->mcast_handler_lock. + */ +static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig, + u8 mcast_flags) +{ + struct hlist_node *node = &orig->mcast_want_all_ipv6_node; + struct hlist_head *head = &bat_priv->mcast.want_all_ipv6_list; + + lockdep_assert_held(&orig->mcast_handler_lock); + + /* switched from flag unset to set */ + if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6 && + !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)) { + atomic_inc(&bat_priv->mcast.num_want_all_ipv6); + + spin_lock_bh(&bat_priv->mcast.want_lists_lock); + /* flag checks above + mcast_handler_lock prevents this */ + WARN_ON(!hlist_unhashed(node)); + + hlist_add_head_rcu(node, head); + spin_unlock_bh(&bat_priv->mcast.want_lists_lock); + /* switched from flag set to unset */ + } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) && + orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) { + atomic_dec(&bat_priv->mcast.num_want_all_ipv6); + + spin_lock_bh(&bat_priv->mcast.want_lists_lock); + /* flag checks above + mcast_handler_lock prevents this */ + WARN_ON(hlist_unhashed(node)); + + hlist_del_init_rcu(node); + spin_unlock_bh(&bat_priv->mcast.want_lists_lock); + } +} + +/** + * batadv_mcast_want_rtr4_update() - update want-all-rtr4 counter and list + * @bat_priv: the bat priv with all the soft interface information + * @orig: the orig_node which multicast state might have changed of + * @mcast_flags: flags indicating the new multicast state + * + * If the BATADV_MCAST_WANT_NO_RTR4 flag of this originator, orig, has + * toggled then this method updates the counter and the list accordingly. + * + * Caller needs to hold orig->mcast_handler_lock. + */ +static void batadv_mcast_want_rtr4_update(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig, + u8 mcast_flags) +{ + struct hlist_node *node = &orig->mcast_want_all_rtr4_node; + struct hlist_head *head = &bat_priv->mcast.want_all_rtr4_list; + + lockdep_assert_held(&orig->mcast_handler_lock); + + /* switched from flag set to unset */ + if (!(mcast_flags & BATADV_MCAST_WANT_NO_RTR4) && + orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR4) { + atomic_inc(&bat_priv->mcast.num_want_all_rtr4); + + spin_lock_bh(&bat_priv->mcast.want_lists_lock); + /* flag checks above + mcast_handler_lock prevents this */ + WARN_ON(!hlist_unhashed(node)); + + hlist_add_head_rcu(node, head); + spin_unlock_bh(&bat_priv->mcast.want_lists_lock); + /* switched from flag unset to set */ + } else if (mcast_flags & BATADV_MCAST_WANT_NO_RTR4 && + !(orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR4)) { + atomic_dec(&bat_priv->mcast.num_want_all_rtr4); + + spin_lock_bh(&bat_priv->mcast.want_lists_lock); + /* flag checks above + mcast_handler_lock prevents this */ + WARN_ON(hlist_unhashed(node)); + + hlist_del_init_rcu(node); + spin_unlock_bh(&bat_priv->mcast.want_lists_lock); + } +} + +/** + * batadv_mcast_want_rtr6_update() - update want-all-rtr6 counter and list + * @bat_priv: the bat priv with all the soft interface information + * @orig: the orig_node which multicast state might have changed of + * @mcast_flags: flags indicating the new multicast state + * + * If the BATADV_MCAST_WANT_NO_RTR6 flag of this originator, orig, has + * toggled then this method updates the counter and the list accordingly. + * + * Caller needs to hold orig->mcast_handler_lock. + */ +static void batadv_mcast_want_rtr6_update(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig, + u8 mcast_flags) +{ + struct hlist_node *node = &orig->mcast_want_all_rtr6_node; + struct hlist_head *head = &bat_priv->mcast.want_all_rtr6_list; + + lockdep_assert_held(&orig->mcast_handler_lock); + + /* switched from flag set to unset */ + if (!(mcast_flags & BATADV_MCAST_WANT_NO_RTR6) && + orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR6) { + atomic_inc(&bat_priv->mcast.num_want_all_rtr6); + + spin_lock_bh(&bat_priv->mcast.want_lists_lock); + /* flag checks above + mcast_handler_lock prevents this */ + WARN_ON(!hlist_unhashed(node)); + + hlist_add_head_rcu(node, head); + spin_unlock_bh(&bat_priv->mcast.want_lists_lock); + /* switched from flag unset to set */ + } else if (mcast_flags & BATADV_MCAST_WANT_NO_RTR6 && + !(orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR6)) { + atomic_dec(&bat_priv->mcast.num_want_all_rtr6); + + spin_lock_bh(&bat_priv->mcast.want_lists_lock); + /* flag checks above + mcast_handler_lock prevents this */ + WARN_ON(hlist_unhashed(node)); + + hlist_del_init_rcu(node); + spin_unlock_bh(&bat_priv->mcast.want_lists_lock); + } +} + +/** + * batadv_mcast_tvlv_flags_get() - get multicast flags from an OGM TVLV + * @enabled: whether the originator has multicast TVLV support enabled + * @tvlv_value: tvlv buffer containing the multicast flags + * @tvlv_value_len: tvlv buffer length + * + * Return: multicast flags for the given tvlv buffer + */ +static u8 +batadv_mcast_tvlv_flags_get(bool enabled, void *tvlv_value, u16 tvlv_value_len) +{ + u8 mcast_flags = BATADV_NO_FLAGS; + + if (enabled && tvlv_value && tvlv_value_len >= sizeof(mcast_flags)) + mcast_flags = *(u8 *)tvlv_value; + + if (!enabled) { + mcast_flags |= BATADV_MCAST_WANT_ALL_IPV4; + mcast_flags |= BATADV_MCAST_WANT_ALL_IPV6; + } + + /* remove redundant flags to avoid sending duplicate packets later */ + if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) + mcast_flags |= BATADV_MCAST_WANT_NO_RTR4; + + if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) + mcast_flags |= BATADV_MCAST_WANT_NO_RTR6; + + return mcast_flags; +} + +/** + * batadv_mcast_tvlv_ogm_handler() - process incoming multicast tvlv container + * @bat_priv: the bat priv with all the soft interface information + * @orig: the orig_node of the ogm + * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) + * @tvlv_value: tvlv buffer containing the multicast data + * @tvlv_value_len: tvlv buffer length + */ +static void batadv_mcast_tvlv_ogm_handler(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig, + u8 flags, + void *tvlv_value, + u16 tvlv_value_len) +{ + bool orig_mcast_enabled = !(flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND); + u8 mcast_flags; + + mcast_flags = batadv_mcast_tvlv_flags_get(orig_mcast_enabled, + tvlv_value, tvlv_value_len); + + spin_lock_bh(&orig->mcast_handler_lock); + + if (orig_mcast_enabled && + !test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) { + set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities); + } else if (!orig_mcast_enabled && + test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) { + clear_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities); + } + + set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized); + + batadv_mcast_want_unsnoop_update(bat_priv, orig, mcast_flags); + batadv_mcast_want_ipv4_update(bat_priv, orig, mcast_flags); + batadv_mcast_want_ipv6_update(bat_priv, orig, mcast_flags); + batadv_mcast_want_rtr4_update(bat_priv, orig, mcast_flags); + batadv_mcast_want_rtr6_update(bat_priv, orig, mcast_flags); + + orig->mcast_flags = mcast_flags; + spin_unlock_bh(&orig->mcast_handler_lock); +} + +/** + * batadv_mcast_init() - initialize the multicast optimizations structures + * @bat_priv: the bat priv with all the soft interface information + */ +void batadv_mcast_init(struct batadv_priv *bat_priv) +{ + batadv_tvlv_handler_register(bat_priv, batadv_mcast_tvlv_ogm_handler, + NULL, BATADV_TVLV_MCAST, 2, + BATADV_TVLV_HANDLER_OGM_CIFNOTFND); + + INIT_DELAYED_WORK(&bat_priv->mcast.work, batadv_mcast_mla_update); + batadv_mcast_start_timer(bat_priv); +} + +/** + * batadv_mcast_mesh_info_put() - put multicast info into a netlink message + * @msg: buffer for the message + * @bat_priv: the bat priv with all the soft interface information + * + * Return: 0 or error code. + */ +int batadv_mcast_mesh_info_put(struct sk_buff *msg, + struct batadv_priv *bat_priv) +{ + u32 flags = bat_priv->mcast.mla_flags.tvlv_flags; + u32 flags_priv = BATADV_NO_FLAGS; + + if (bat_priv->mcast.mla_flags.bridged) { + flags_priv |= BATADV_MCAST_FLAGS_BRIDGED; + + if (bat_priv->mcast.mla_flags.querier_ipv4.exists) + flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV4_EXISTS; + if (bat_priv->mcast.mla_flags.querier_ipv6.exists) + flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV6_EXISTS; + if (bat_priv->mcast.mla_flags.querier_ipv4.shadowing) + flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV4_SHADOWING; + if (bat_priv->mcast.mla_flags.querier_ipv6.shadowing) + flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV6_SHADOWING; + } + + if (nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS, flags) || + nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS_PRIV, flags_priv)) + return -EMSGSIZE; + + return 0; +} + +/** + * batadv_mcast_flags_dump_entry() - dump one entry of the multicast flags table + * to a netlink socket + * @msg: buffer for the message + * @portid: netlink port + * @cb: Control block containing additional options + * @orig_node: originator to dump the multicast flags of + * + * Return: 0 or error code. + */ +static int +batadv_mcast_flags_dump_entry(struct sk_buff *msg, u32 portid, + struct netlink_callback *cb, + struct batadv_orig_node *orig_node) +{ + void *hdr; + + hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq, + &batadv_netlink_family, NLM_F_MULTI, + BATADV_CMD_GET_MCAST_FLAGS); + if (!hdr) + return -ENOBUFS; + + genl_dump_check_consistent(cb, hdr); + + if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, + orig_node->orig)) { + genlmsg_cancel(msg, hdr); + return -EMSGSIZE; + } + + if (test_bit(BATADV_ORIG_CAPA_HAS_MCAST, + &orig_node->capabilities)) { + if (nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS, + orig_node->mcast_flags)) { + genlmsg_cancel(msg, hdr); + return -EMSGSIZE; + } + } + + genlmsg_end(msg, hdr); + return 0; +} + +/** + * batadv_mcast_flags_dump_bucket() - dump one bucket of the multicast flags + * table to a netlink socket + * @msg: buffer for the message + * @portid: netlink port + * @cb: Control block containing additional options + * @hash: hash to dump + * @bucket: bucket index to dump + * @idx_skip: How many entries to skip + * + * Return: 0 or error code. + */ +static int +batadv_mcast_flags_dump_bucket(struct sk_buff *msg, u32 portid, + struct netlink_callback *cb, + struct batadv_hashtable *hash, + unsigned int bucket, long *idx_skip) +{ + struct batadv_orig_node *orig_node; + long idx = 0; + + spin_lock_bh(&hash->list_locks[bucket]); + cb->seq = atomic_read(&hash->generation) << 1 | 1; + + hlist_for_each_entry(orig_node, &hash->table[bucket], hash_entry) { + if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, + &orig_node->capa_initialized)) + continue; + + if (idx < *idx_skip) + goto skip; + + if (batadv_mcast_flags_dump_entry(msg, portid, cb, orig_node)) { + spin_unlock_bh(&hash->list_locks[bucket]); + *idx_skip = idx; + + return -EMSGSIZE; + } + +skip: + idx++; + } + spin_unlock_bh(&hash->list_locks[bucket]); + + return 0; +} + +/** + * __batadv_mcast_flags_dump() - dump multicast flags table to a netlink socket + * @msg: buffer for the message + * @portid: netlink port + * @cb: Control block containing additional options + * @bat_priv: the bat priv with all the soft interface information + * @bucket: current bucket to dump + * @idx: index in current bucket to the next entry to dump + * + * Return: 0 or error code. + */ +static int +__batadv_mcast_flags_dump(struct sk_buff *msg, u32 portid, + struct netlink_callback *cb, + struct batadv_priv *bat_priv, long *bucket, long *idx) +{ + struct batadv_hashtable *hash = bat_priv->orig_hash; + long bucket_tmp = *bucket; + long idx_tmp = *idx; + + while (bucket_tmp < hash->size) { + if (batadv_mcast_flags_dump_bucket(msg, portid, cb, hash, + bucket_tmp, &idx_tmp)) + break; + + bucket_tmp++; + idx_tmp = 0; + } + + *bucket = bucket_tmp; + *idx = idx_tmp; + + return msg->len; +} + +/** + * batadv_mcast_netlink_get_primary() - get primary interface from netlink + * callback + * @cb: netlink callback structure + * @primary_if: the primary interface pointer to return the result in + * + * Return: 0 or error code. + */ +static int +batadv_mcast_netlink_get_primary(struct netlink_callback *cb, + struct batadv_hard_iface **primary_if) +{ + struct batadv_hard_iface *hard_iface = NULL; + struct net *net = sock_net(cb->skb->sk); + struct net_device *soft_iface; + struct batadv_priv *bat_priv; + int ifindex; + int ret = 0; + + ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX); + if (!ifindex) + return -EINVAL; + + soft_iface = dev_get_by_index(net, ifindex); + if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { + ret = -ENODEV; + goto out; + } + + bat_priv = netdev_priv(soft_iface); + + hard_iface = batadv_primary_if_get_selected(bat_priv); + if (!hard_iface || hard_iface->if_status != BATADV_IF_ACTIVE) { + ret = -ENOENT; + goto out; + } + +out: + dev_put(soft_iface); + + if (!ret && primary_if) + *primary_if = hard_iface; + else + batadv_hardif_put(hard_iface); + + return ret; +} + +/** + * batadv_mcast_flags_dump() - dump multicast flags table to a netlink socket + * @msg: buffer for the message + * @cb: callback structure containing arguments + * + * Return: message length. + */ +int batadv_mcast_flags_dump(struct sk_buff *msg, struct netlink_callback *cb) +{ + struct batadv_hard_iface *primary_if = NULL; + int portid = NETLINK_CB(cb->skb).portid; + struct batadv_priv *bat_priv; + long *bucket = &cb->args[0]; + long *idx = &cb->args[1]; + int ret; + + ret = batadv_mcast_netlink_get_primary(cb, &primary_if); + if (ret) + return ret; + + bat_priv = netdev_priv(primary_if->soft_iface); + ret = __batadv_mcast_flags_dump(msg, portid, cb, bat_priv, bucket, idx); + + batadv_hardif_put(primary_if); + return ret; +} + +/** + * batadv_mcast_free() - free the multicast optimizations structures + * @bat_priv: the bat priv with all the soft interface information + */ +void batadv_mcast_free(struct batadv_priv *bat_priv) +{ + cancel_delayed_work_sync(&bat_priv->mcast.work); + + batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_MCAST, 2); + batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST, 2); + + /* safely calling outside of worker, as worker was canceled above */ + batadv_mcast_mla_tt_retract(bat_priv, NULL); +} + +/** + * batadv_mcast_purge_orig() - reset originator global mcast state modifications + * @orig: the originator which is going to get purged + */ +void batadv_mcast_purge_orig(struct batadv_orig_node *orig) +{ + struct batadv_priv *bat_priv = orig->bat_priv; + + spin_lock_bh(&orig->mcast_handler_lock); + + batadv_mcast_want_unsnoop_update(bat_priv, orig, BATADV_NO_FLAGS); + batadv_mcast_want_ipv4_update(bat_priv, orig, BATADV_NO_FLAGS); + batadv_mcast_want_ipv6_update(bat_priv, orig, BATADV_NO_FLAGS); + batadv_mcast_want_rtr4_update(bat_priv, orig, + BATADV_MCAST_WANT_NO_RTR4); + batadv_mcast_want_rtr6_update(bat_priv, orig, + BATADV_MCAST_WANT_NO_RTR6); + + spin_unlock_bh(&orig->mcast_handler_lock); +} diff --git a/net/batman-adv/multicast.h b/net/batman-adv/multicast.h new file mode 100644 index 000000000..8aec818d0 --- /dev/null +++ b/net/batman-adv/multicast.h @@ -0,0 +1,123 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Linus Lüssing + */ + +#ifndef _NET_BATMAN_ADV_MULTICAST_H_ +#define _NET_BATMAN_ADV_MULTICAST_H_ + +#include "main.h" + +#include <linux/netlink.h> +#include <linux/skbuff.h> + +/** + * enum batadv_forw_mode - the way a packet should be forwarded as + */ +enum batadv_forw_mode { + /** + * @BATADV_FORW_ALL: forward the packet to all nodes (currently via + * classic flooding) + */ + BATADV_FORW_ALL, + + /** + * @BATADV_FORW_SOME: forward the packet to some nodes (currently via + * a multicast-to-unicast conversion and the BATMAN unicast routing + * protocol) + */ + BATADV_FORW_SOME, + + /** + * @BATADV_FORW_SINGLE: forward the packet to a single node (currently + * via the BATMAN unicast routing protocol) + */ + BATADV_FORW_SINGLE, + + /** @BATADV_FORW_NONE: don't forward, drop it */ + BATADV_FORW_NONE, +}; + +#ifdef CONFIG_BATMAN_ADV_MCAST + +enum batadv_forw_mode +batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb, + struct batadv_orig_node **mcast_single_orig, + int *is_routable); + +int batadv_mcast_forw_send_orig(struct batadv_priv *bat_priv, + struct sk_buff *skb, + unsigned short vid, + struct batadv_orig_node *orig_node); + +int batadv_mcast_forw_send(struct batadv_priv *bat_priv, struct sk_buff *skb, + unsigned short vid, int is_routable); + +void batadv_mcast_init(struct batadv_priv *bat_priv); + +int batadv_mcast_mesh_info_put(struct sk_buff *msg, + struct batadv_priv *bat_priv); + +int batadv_mcast_flags_dump(struct sk_buff *msg, struct netlink_callback *cb); + +void batadv_mcast_free(struct batadv_priv *bat_priv); + +void batadv_mcast_purge_orig(struct batadv_orig_node *orig_node); + +#else + +static inline enum batadv_forw_mode +batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb, + struct batadv_orig_node **mcast_single_orig, + int *is_routable) +{ + return BATADV_FORW_ALL; +} + +static inline int +batadv_mcast_forw_send_orig(struct batadv_priv *bat_priv, + struct sk_buff *skb, + unsigned short vid, + struct batadv_orig_node *orig_node) +{ + kfree_skb(skb); + return NET_XMIT_DROP; +} + +static inline int +batadv_mcast_forw_send(struct batadv_priv *bat_priv, struct sk_buff *skb, + unsigned short vid, int is_routable) +{ + kfree_skb(skb); + return NET_XMIT_DROP; +} + +static inline int batadv_mcast_init(struct batadv_priv *bat_priv) +{ + return 0; +} + +static inline int +batadv_mcast_mesh_info_put(struct sk_buff *msg, struct batadv_priv *bat_priv) +{ + return 0; +} + +static inline int batadv_mcast_flags_dump(struct sk_buff *msg, + struct netlink_callback *cb) +{ + return -EOPNOTSUPP; +} + +static inline void batadv_mcast_free(struct batadv_priv *bat_priv) +{ +} + +static inline void batadv_mcast_purge_orig(struct batadv_orig_node *orig_node) +{ +} + +#endif /* CONFIG_BATMAN_ADV_MCAST */ + +#endif /* _NET_BATMAN_ADV_MULTICAST_H_ */ diff --git a/net/batman-adv/netlink.c b/net/batman-adv/netlink.c new file mode 100644 index 000000000..86e0664e0 --- /dev/null +++ b/net/batman-adv/netlink.c @@ -0,0 +1,1522 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Matthias Schiffer + */ + +#include "netlink.h" +#include "main.h" + +#include <linux/atomic.h> +#include <linux/bitops.h> +#include <linux/bug.h> +#include <linux/byteorder/generic.h> +#include <linux/cache.h> +#include <linux/err.h> +#include <linux/errno.h> +#include <linux/export.h> +#include <linux/genetlink.h> +#include <linux/gfp.h> +#include <linux/if_ether.h> +#include <linux/if_vlan.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/limits.h> +#include <linux/list.h> +#include <linux/minmax.h> +#include <linux/netdevice.h> +#include <linux/netlink.h> +#include <linux/printk.h> +#include <linux/rtnetlink.h> +#include <linux/skbuff.h> +#include <linux/stddef.h> +#include <linux/types.h> +#include <net/genetlink.h> +#include <net/net_namespace.h> +#include <net/netlink.h> +#include <net/sock.h> +#include <uapi/linux/batadv_packet.h> +#include <uapi/linux/batman_adv.h> + +#include "bat_algo.h" +#include "bridge_loop_avoidance.h" +#include "distributed-arp-table.h" +#include "gateway_client.h" +#include "gateway_common.h" +#include "hard-interface.h" +#include "log.h" +#include "multicast.h" +#include "network-coding.h" +#include "originator.h" +#include "soft-interface.h" +#include "tp_meter.h" +#include "translation-table.h" + +struct genl_family batadv_netlink_family; + +/* multicast groups */ +enum batadv_netlink_multicast_groups { + BATADV_NL_MCGRP_CONFIG, + BATADV_NL_MCGRP_TPMETER, +}; + +/** + * enum batadv_genl_ops_flags - flags for genl_ops's internal_flags + */ +enum batadv_genl_ops_flags { + /** + * @BATADV_FLAG_NEED_MESH: request requires valid soft interface in + * attribute BATADV_ATTR_MESH_IFINDEX and expects a pointer to it to be + * saved in info->user_ptr[0] + */ + BATADV_FLAG_NEED_MESH = BIT(0), + + /** + * @BATADV_FLAG_NEED_HARDIF: request requires valid hard interface in + * attribute BATADV_ATTR_HARD_IFINDEX and expects a pointer to it to be + * saved in info->user_ptr[1] + */ + BATADV_FLAG_NEED_HARDIF = BIT(1), + + /** + * @BATADV_FLAG_NEED_VLAN: request requires valid vlan in + * attribute BATADV_ATTR_VLANID and expects a pointer to it to be + * saved in info->user_ptr[1] + */ + BATADV_FLAG_NEED_VLAN = BIT(2), +}; + +static const struct genl_multicast_group batadv_netlink_mcgrps[] = { + [BATADV_NL_MCGRP_CONFIG] = { .name = BATADV_NL_MCAST_GROUP_CONFIG }, + [BATADV_NL_MCGRP_TPMETER] = { .name = BATADV_NL_MCAST_GROUP_TPMETER }, +}; + +static const struct nla_policy batadv_netlink_policy[NUM_BATADV_ATTR] = { + [BATADV_ATTR_VERSION] = { .type = NLA_STRING }, + [BATADV_ATTR_ALGO_NAME] = { .type = NLA_STRING }, + [BATADV_ATTR_MESH_IFINDEX] = { .type = NLA_U32 }, + [BATADV_ATTR_MESH_IFNAME] = { .type = NLA_STRING }, + [BATADV_ATTR_MESH_ADDRESS] = { .len = ETH_ALEN }, + [BATADV_ATTR_HARD_IFINDEX] = { .type = NLA_U32 }, + [BATADV_ATTR_HARD_IFNAME] = { .type = NLA_STRING }, + [BATADV_ATTR_HARD_ADDRESS] = { .len = ETH_ALEN }, + [BATADV_ATTR_ORIG_ADDRESS] = { .len = ETH_ALEN }, + [BATADV_ATTR_TPMETER_RESULT] = { .type = NLA_U8 }, + [BATADV_ATTR_TPMETER_TEST_TIME] = { .type = NLA_U32 }, + [BATADV_ATTR_TPMETER_BYTES] = { .type = NLA_U64 }, + [BATADV_ATTR_TPMETER_COOKIE] = { .type = NLA_U32 }, + [BATADV_ATTR_ACTIVE] = { .type = NLA_FLAG }, + [BATADV_ATTR_TT_ADDRESS] = { .len = ETH_ALEN }, + [BATADV_ATTR_TT_TTVN] = { .type = NLA_U8 }, + [BATADV_ATTR_TT_LAST_TTVN] = { .type = NLA_U8 }, + [BATADV_ATTR_TT_CRC32] = { .type = NLA_U32 }, + [BATADV_ATTR_TT_VID] = { .type = NLA_U16 }, + [BATADV_ATTR_TT_FLAGS] = { .type = NLA_U32 }, + [BATADV_ATTR_FLAG_BEST] = { .type = NLA_FLAG }, + [BATADV_ATTR_LAST_SEEN_MSECS] = { .type = NLA_U32 }, + [BATADV_ATTR_NEIGH_ADDRESS] = { .len = ETH_ALEN }, + [BATADV_ATTR_TQ] = { .type = NLA_U8 }, + [BATADV_ATTR_THROUGHPUT] = { .type = NLA_U32 }, + [BATADV_ATTR_BANDWIDTH_UP] = { .type = NLA_U32 }, + [BATADV_ATTR_BANDWIDTH_DOWN] = { .type = NLA_U32 }, + [BATADV_ATTR_ROUTER] = { .len = ETH_ALEN }, + [BATADV_ATTR_BLA_OWN] = { .type = NLA_FLAG }, + [BATADV_ATTR_BLA_ADDRESS] = { .len = ETH_ALEN }, + [BATADV_ATTR_BLA_VID] = { .type = NLA_U16 }, + [BATADV_ATTR_BLA_BACKBONE] = { .len = ETH_ALEN }, + [BATADV_ATTR_BLA_CRC] = { .type = NLA_U16 }, + [BATADV_ATTR_DAT_CACHE_IP4ADDRESS] = { .type = NLA_U32 }, + [BATADV_ATTR_DAT_CACHE_HWADDRESS] = { .len = ETH_ALEN }, + [BATADV_ATTR_DAT_CACHE_VID] = { .type = NLA_U16 }, + [BATADV_ATTR_MCAST_FLAGS] = { .type = NLA_U32 }, + [BATADV_ATTR_MCAST_FLAGS_PRIV] = { .type = NLA_U32 }, + [BATADV_ATTR_VLANID] = { .type = NLA_U16 }, + [BATADV_ATTR_AGGREGATED_OGMS_ENABLED] = { .type = NLA_U8 }, + [BATADV_ATTR_AP_ISOLATION_ENABLED] = { .type = NLA_U8 }, + [BATADV_ATTR_ISOLATION_MARK] = { .type = NLA_U32 }, + [BATADV_ATTR_ISOLATION_MASK] = { .type = NLA_U32 }, + [BATADV_ATTR_BONDING_ENABLED] = { .type = NLA_U8 }, + [BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE_ENABLED] = { .type = NLA_U8 }, + [BATADV_ATTR_DISTRIBUTED_ARP_TABLE_ENABLED] = { .type = NLA_U8 }, + [BATADV_ATTR_FRAGMENTATION_ENABLED] = { .type = NLA_U8 }, + [BATADV_ATTR_GW_BANDWIDTH_DOWN] = { .type = NLA_U32 }, + [BATADV_ATTR_GW_BANDWIDTH_UP] = { .type = NLA_U32 }, + [BATADV_ATTR_GW_MODE] = { .type = NLA_U8 }, + [BATADV_ATTR_GW_SEL_CLASS] = { .type = NLA_U32 }, + [BATADV_ATTR_HOP_PENALTY] = { .type = NLA_U8 }, + [BATADV_ATTR_LOG_LEVEL] = { .type = NLA_U32 }, + [BATADV_ATTR_MULTICAST_FORCEFLOOD_ENABLED] = { .type = NLA_U8 }, + [BATADV_ATTR_MULTICAST_FANOUT] = { .type = NLA_U32 }, + [BATADV_ATTR_NETWORK_CODING_ENABLED] = { .type = NLA_U8 }, + [BATADV_ATTR_ORIG_INTERVAL] = { .type = NLA_U32 }, + [BATADV_ATTR_ELP_INTERVAL] = { .type = NLA_U32 }, + [BATADV_ATTR_THROUGHPUT_OVERRIDE] = { .type = NLA_U32 }, +}; + +/** + * batadv_netlink_get_ifindex() - Extract an interface index from a message + * @nlh: Message header + * @attrtype: Attribute which holds an interface index + * + * Return: interface index, or 0. + */ +int +batadv_netlink_get_ifindex(const struct nlmsghdr *nlh, int attrtype) +{ + struct nlattr *attr = nlmsg_find_attr(nlh, GENL_HDRLEN, attrtype); + + return (attr && nla_len(attr) == sizeof(u32)) ? nla_get_u32(attr) : 0; +} + +/** + * batadv_netlink_mesh_fill_ap_isolation() - Add ap_isolation softif attribute + * @msg: Netlink message to dump into + * @bat_priv: the bat priv with all the soft interface information + * + * Return: 0 on success or negative error number in case of failure + */ +static int batadv_netlink_mesh_fill_ap_isolation(struct sk_buff *msg, + struct batadv_priv *bat_priv) +{ + struct batadv_softif_vlan *vlan; + u8 ap_isolation; + + vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); + if (!vlan) + return 0; + + ap_isolation = atomic_read(&vlan->ap_isolation); + batadv_softif_vlan_put(vlan); + + return nla_put_u8(msg, BATADV_ATTR_AP_ISOLATION_ENABLED, + !!ap_isolation); +} + +/** + * batadv_netlink_set_mesh_ap_isolation() - Set ap_isolation from genl msg + * @attr: parsed BATADV_ATTR_AP_ISOLATION_ENABLED attribute + * @bat_priv: the bat priv with all the soft interface information + * + * Return: 0 on success or negative error number in case of failure + */ +static int batadv_netlink_set_mesh_ap_isolation(struct nlattr *attr, + struct batadv_priv *bat_priv) +{ + struct batadv_softif_vlan *vlan; + + vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); + if (!vlan) + return -ENOENT; + + atomic_set(&vlan->ap_isolation, !!nla_get_u8(attr)); + batadv_softif_vlan_put(vlan); + + return 0; +} + +/** + * batadv_netlink_mesh_fill() - Fill message with mesh attributes + * @msg: Netlink message to dump into + * @bat_priv: the bat priv with all the soft interface information + * @cmd: type of message to generate + * @portid: Port making netlink request + * @seq: sequence number for message + * @flags: Additional flags for message + * + * Return: 0 on success or negative error number in case of failure + */ +static int batadv_netlink_mesh_fill(struct sk_buff *msg, + struct batadv_priv *bat_priv, + enum batadv_nl_commands cmd, + u32 portid, u32 seq, int flags) +{ + struct net_device *soft_iface = bat_priv->soft_iface; + struct batadv_hard_iface *primary_if = NULL; + struct net_device *hard_iface; + void *hdr; + + hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, flags, cmd); + if (!hdr) + return -ENOBUFS; + + if (nla_put_string(msg, BATADV_ATTR_VERSION, BATADV_SOURCE_VERSION) || + nla_put_string(msg, BATADV_ATTR_ALGO_NAME, + bat_priv->algo_ops->name) || + nla_put_u32(msg, BATADV_ATTR_MESH_IFINDEX, soft_iface->ifindex) || + nla_put_string(msg, BATADV_ATTR_MESH_IFNAME, soft_iface->name) || + nla_put(msg, BATADV_ATTR_MESH_ADDRESS, ETH_ALEN, + soft_iface->dev_addr) || + nla_put_u8(msg, BATADV_ATTR_TT_TTVN, + (u8)atomic_read(&bat_priv->tt.vn))) + goto nla_put_failure; + +#ifdef CONFIG_BATMAN_ADV_BLA + if (nla_put_u16(msg, BATADV_ATTR_BLA_CRC, + ntohs(bat_priv->bla.claim_dest.group))) + goto nla_put_failure; +#endif + + if (batadv_mcast_mesh_info_put(msg, bat_priv)) + goto nla_put_failure; + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (primary_if && primary_if->if_status == BATADV_IF_ACTIVE) { + hard_iface = primary_if->net_dev; + + if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX, + hard_iface->ifindex) || + nla_put_string(msg, BATADV_ATTR_HARD_IFNAME, + hard_iface->name) || + nla_put(msg, BATADV_ATTR_HARD_ADDRESS, ETH_ALEN, + hard_iface->dev_addr)) + goto nla_put_failure; + } + + if (nla_put_u8(msg, BATADV_ATTR_AGGREGATED_OGMS_ENABLED, + !!atomic_read(&bat_priv->aggregated_ogms))) + goto nla_put_failure; + + if (batadv_netlink_mesh_fill_ap_isolation(msg, bat_priv)) + goto nla_put_failure; + + if (nla_put_u32(msg, BATADV_ATTR_ISOLATION_MARK, + bat_priv->isolation_mark)) + goto nla_put_failure; + + if (nla_put_u32(msg, BATADV_ATTR_ISOLATION_MASK, + bat_priv->isolation_mark_mask)) + goto nla_put_failure; + + if (nla_put_u8(msg, BATADV_ATTR_BONDING_ENABLED, + !!atomic_read(&bat_priv->bonding))) + goto nla_put_failure; + +#ifdef CONFIG_BATMAN_ADV_BLA + if (nla_put_u8(msg, BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE_ENABLED, + !!atomic_read(&bat_priv->bridge_loop_avoidance))) + goto nla_put_failure; +#endif /* CONFIG_BATMAN_ADV_BLA */ + +#ifdef CONFIG_BATMAN_ADV_DAT + if (nla_put_u8(msg, BATADV_ATTR_DISTRIBUTED_ARP_TABLE_ENABLED, + !!atomic_read(&bat_priv->distributed_arp_table))) + goto nla_put_failure; +#endif /* CONFIG_BATMAN_ADV_DAT */ + + if (nla_put_u8(msg, BATADV_ATTR_FRAGMENTATION_ENABLED, + !!atomic_read(&bat_priv->fragmentation))) + goto nla_put_failure; + + if (nla_put_u32(msg, BATADV_ATTR_GW_BANDWIDTH_DOWN, + atomic_read(&bat_priv->gw.bandwidth_down))) + goto nla_put_failure; + + if (nla_put_u32(msg, BATADV_ATTR_GW_BANDWIDTH_UP, + atomic_read(&bat_priv->gw.bandwidth_up))) + goto nla_put_failure; + + if (nla_put_u8(msg, BATADV_ATTR_GW_MODE, + atomic_read(&bat_priv->gw.mode))) + goto nla_put_failure; + + if (bat_priv->algo_ops->gw.get_best_gw_node && + bat_priv->algo_ops->gw.is_eligible) { + /* GW selection class is not available if the routing algorithm + * in use does not implement the GW API + */ + if (nla_put_u32(msg, BATADV_ATTR_GW_SEL_CLASS, + atomic_read(&bat_priv->gw.sel_class))) + goto nla_put_failure; + } + + if (nla_put_u8(msg, BATADV_ATTR_HOP_PENALTY, + atomic_read(&bat_priv->hop_penalty))) + goto nla_put_failure; + +#ifdef CONFIG_BATMAN_ADV_DEBUG + if (nla_put_u32(msg, BATADV_ATTR_LOG_LEVEL, + atomic_read(&bat_priv->log_level))) + goto nla_put_failure; +#endif /* CONFIG_BATMAN_ADV_DEBUG */ + +#ifdef CONFIG_BATMAN_ADV_MCAST + if (nla_put_u8(msg, BATADV_ATTR_MULTICAST_FORCEFLOOD_ENABLED, + !atomic_read(&bat_priv->multicast_mode))) + goto nla_put_failure; + + if (nla_put_u32(msg, BATADV_ATTR_MULTICAST_FANOUT, + atomic_read(&bat_priv->multicast_fanout))) + goto nla_put_failure; +#endif /* CONFIG_BATMAN_ADV_MCAST */ + +#ifdef CONFIG_BATMAN_ADV_NC + if (nla_put_u8(msg, BATADV_ATTR_NETWORK_CODING_ENABLED, + !!atomic_read(&bat_priv->network_coding))) + goto nla_put_failure; +#endif /* CONFIG_BATMAN_ADV_NC */ + + if (nla_put_u32(msg, BATADV_ATTR_ORIG_INTERVAL, + atomic_read(&bat_priv->orig_interval))) + goto nla_put_failure; + + batadv_hardif_put(primary_if); + + genlmsg_end(msg, hdr); + return 0; + +nla_put_failure: + batadv_hardif_put(primary_if); + + genlmsg_cancel(msg, hdr); + return -EMSGSIZE; +} + +/** + * batadv_netlink_notify_mesh() - send softif attributes to listener + * @bat_priv: the bat priv with all the soft interface information + * + * Return: 0 on success, < 0 on error + */ +int batadv_netlink_notify_mesh(struct batadv_priv *bat_priv) +{ + struct sk_buff *msg; + int ret; + + msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); + if (!msg) + return -ENOMEM; + + ret = batadv_netlink_mesh_fill(msg, bat_priv, BATADV_CMD_SET_MESH, + 0, 0, 0); + if (ret < 0) { + nlmsg_free(msg); + return ret; + } + + genlmsg_multicast_netns(&batadv_netlink_family, + dev_net(bat_priv->soft_iface), msg, 0, + BATADV_NL_MCGRP_CONFIG, GFP_KERNEL); + + return 0; +} + +/** + * batadv_netlink_get_mesh() - Get softif attributes + * @skb: Netlink message with request data + * @info: receiver information + * + * Return: 0 on success or negative error number in case of failure + */ +static int batadv_netlink_get_mesh(struct sk_buff *skb, struct genl_info *info) +{ + struct batadv_priv *bat_priv = info->user_ptr[0]; + struct sk_buff *msg; + int ret; + + msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); + if (!msg) + return -ENOMEM; + + ret = batadv_netlink_mesh_fill(msg, bat_priv, BATADV_CMD_GET_MESH, + info->snd_portid, info->snd_seq, 0); + if (ret < 0) { + nlmsg_free(msg); + return ret; + } + + ret = genlmsg_reply(msg, info); + + return ret; +} + +/** + * batadv_netlink_set_mesh() - Set softif attributes + * @skb: Netlink message with request data + * @info: receiver information + * + * Return: 0 on success or negative error number in case of failure + */ +static int batadv_netlink_set_mesh(struct sk_buff *skb, struct genl_info *info) +{ + struct batadv_priv *bat_priv = info->user_ptr[0]; + struct nlattr *attr; + + if (info->attrs[BATADV_ATTR_AGGREGATED_OGMS_ENABLED]) { + attr = info->attrs[BATADV_ATTR_AGGREGATED_OGMS_ENABLED]; + + atomic_set(&bat_priv->aggregated_ogms, !!nla_get_u8(attr)); + } + + if (info->attrs[BATADV_ATTR_AP_ISOLATION_ENABLED]) { + attr = info->attrs[BATADV_ATTR_AP_ISOLATION_ENABLED]; + + batadv_netlink_set_mesh_ap_isolation(attr, bat_priv); + } + + if (info->attrs[BATADV_ATTR_ISOLATION_MARK]) { + attr = info->attrs[BATADV_ATTR_ISOLATION_MARK]; + + bat_priv->isolation_mark = nla_get_u32(attr); + } + + if (info->attrs[BATADV_ATTR_ISOLATION_MASK]) { + attr = info->attrs[BATADV_ATTR_ISOLATION_MASK]; + + bat_priv->isolation_mark_mask = nla_get_u32(attr); + } + + if (info->attrs[BATADV_ATTR_BONDING_ENABLED]) { + attr = info->attrs[BATADV_ATTR_BONDING_ENABLED]; + + atomic_set(&bat_priv->bonding, !!nla_get_u8(attr)); + } + +#ifdef CONFIG_BATMAN_ADV_BLA + if (info->attrs[BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE_ENABLED]) { + attr = info->attrs[BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE_ENABLED]; + + atomic_set(&bat_priv->bridge_loop_avoidance, + !!nla_get_u8(attr)); + batadv_bla_status_update(bat_priv->soft_iface); + } +#endif /* CONFIG_BATMAN_ADV_BLA */ + +#ifdef CONFIG_BATMAN_ADV_DAT + if (info->attrs[BATADV_ATTR_DISTRIBUTED_ARP_TABLE_ENABLED]) { + attr = info->attrs[BATADV_ATTR_DISTRIBUTED_ARP_TABLE_ENABLED]; + + atomic_set(&bat_priv->distributed_arp_table, + !!nla_get_u8(attr)); + batadv_dat_status_update(bat_priv->soft_iface); + } +#endif /* CONFIG_BATMAN_ADV_DAT */ + + if (info->attrs[BATADV_ATTR_FRAGMENTATION_ENABLED]) { + attr = info->attrs[BATADV_ATTR_FRAGMENTATION_ENABLED]; + + atomic_set(&bat_priv->fragmentation, !!nla_get_u8(attr)); + + rtnl_lock(); + batadv_update_min_mtu(bat_priv->soft_iface); + rtnl_unlock(); + } + + if (info->attrs[BATADV_ATTR_GW_BANDWIDTH_DOWN]) { + attr = info->attrs[BATADV_ATTR_GW_BANDWIDTH_DOWN]; + + atomic_set(&bat_priv->gw.bandwidth_down, nla_get_u32(attr)); + batadv_gw_tvlv_container_update(bat_priv); + } + + if (info->attrs[BATADV_ATTR_GW_BANDWIDTH_UP]) { + attr = info->attrs[BATADV_ATTR_GW_BANDWIDTH_UP]; + + atomic_set(&bat_priv->gw.bandwidth_up, nla_get_u32(attr)); + batadv_gw_tvlv_container_update(bat_priv); + } + + if (info->attrs[BATADV_ATTR_GW_MODE]) { + u8 gw_mode; + + attr = info->attrs[BATADV_ATTR_GW_MODE]; + gw_mode = nla_get_u8(attr); + + if (gw_mode <= BATADV_GW_MODE_SERVER) { + /* Invoking batadv_gw_reselect() is not enough to really + * de-select the current GW. It will only instruct the + * gateway client code to perform a re-election the next + * time that this is needed. + * + * When gw client mode is being switched off the current + * GW must be de-selected explicitly otherwise no GW_ADD + * uevent is thrown on client mode re-activation. This + * is operation is performed in + * batadv_gw_check_client_stop(). + */ + batadv_gw_reselect(bat_priv); + + /* always call batadv_gw_check_client_stop() before + * changing the gateway state + */ + batadv_gw_check_client_stop(bat_priv); + atomic_set(&bat_priv->gw.mode, gw_mode); + batadv_gw_tvlv_container_update(bat_priv); + } + } + + if (info->attrs[BATADV_ATTR_GW_SEL_CLASS] && + bat_priv->algo_ops->gw.get_best_gw_node && + bat_priv->algo_ops->gw.is_eligible) { + /* setting the GW selection class is allowed only if the routing + * algorithm in use implements the GW API + */ + + u32 sel_class_max = 0xffffffffu; + u32 sel_class; + + attr = info->attrs[BATADV_ATTR_GW_SEL_CLASS]; + sel_class = nla_get_u32(attr); + + if (!bat_priv->algo_ops->gw.store_sel_class) + sel_class_max = BATADV_TQ_MAX_VALUE; + + if (sel_class >= 1 && sel_class <= sel_class_max) { + atomic_set(&bat_priv->gw.sel_class, sel_class); + batadv_gw_reselect(bat_priv); + } + } + + if (info->attrs[BATADV_ATTR_HOP_PENALTY]) { + attr = info->attrs[BATADV_ATTR_HOP_PENALTY]; + + atomic_set(&bat_priv->hop_penalty, nla_get_u8(attr)); + } + +#ifdef CONFIG_BATMAN_ADV_DEBUG + if (info->attrs[BATADV_ATTR_LOG_LEVEL]) { + attr = info->attrs[BATADV_ATTR_LOG_LEVEL]; + + atomic_set(&bat_priv->log_level, + nla_get_u32(attr) & BATADV_DBG_ALL); + } +#endif /* CONFIG_BATMAN_ADV_DEBUG */ + +#ifdef CONFIG_BATMAN_ADV_MCAST + if (info->attrs[BATADV_ATTR_MULTICAST_FORCEFLOOD_ENABLED]) { + attr = info->attrs[BATADV_ATTR_MULTICAST_FORCEFLOOD_ENABLED]; + + atomic_set(&bat_priv->multicast_mode, !nla_get_u8(attr)); + } + + if (info->attrs[BATADV_ATTR_MULTICAST_FANOUT]) { + attr = info->attrs[BATADV_ATTR_MULTICAST_FANOUT]; + + atomic_set(&bat_priv->multicast_fanout, nla_get_u32(attr)); + } +#endif /* CONFIG_BATMAN_ADV_MCAST */ + +#ifdef CONFIG_BATMAN_ADV_NC + if (info->attrs[BATADV_ATTR_NETWORK_CODING_ENABLED]) { + attr = info->attrs[BATADV_ATTR_NETWORK_CODING_ENABLED]; + + atomic_set(&bat_priv->network_coding, !!nla_get_u8(attr)); + batadv_nc_status_update(bat_priv->soft_iface); + } +#endif /* CONFIG_BATMAN_ADV_NC */ + + if (info->attrs[BATADV_ATTR_ORIG_INTERVAL]) { + u32 orig_interval; + + attr = info->attrs[BATADV_ATTR_ORIG_INTERVAL]; + orig_interval = nla_get_u32(attr); + + orig_interval = min_t(u32, orig_interval, INT_MAX); + orig_interval = max_t(u32, orig_interval, 2 * BATADV_JITTER); + + atomic_set(&bat_priv->orig_interval, orig_interval); + } + + batadv_netlink_notify_mesh(bat_priv); + + return 0; +} + +/** + * batadv_netlink_tp_meter_put() - Fill information of started tp_meter session + * @msg: netlink message to be sent back + * @cookie: tp meter session cookie + * + * Return: 0 on success, < 0 on error + */ +static int +batadv_netlink_tp_meter_put(struct sk_buff *msg, u32 cookie) +{ + if (nla_put_u32(msg, BATADV_ATTR_TPMETER_COOKIE, cookie)) + return -ENOBUFS; + + return 0; +} + +/** + * batadv_netlink_tpmeter_notify() - send tp_meter result via netlink to client + * @bat_priv: the bat priv with all the soft interface information + * @dst: destination of tp_meter session + * @result: reason for tp meter session stop + * @test_time: total time of the tp_meter session + * @total_bytes: bytes acked to the receiver + * @cookie: cookie of tp_meter session + * + * Return: 0 on success, < 0 on error + */ +int batadv_netlink_tpmeter_notify(struct batadv_priv *bat_priv, const u8 *dst, + u8 result, u32 test_time, u64 total_bytes, + u32 cookie) +{ + struct sk_buff *msg; + void *hdr; + int ret; + + msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); + if (!msg) + return -ENOMEM; + + hdr = genlmsg_put(msg, 0, 0, &batadv_netlink_family, 0, + BATADV_CMD_TP_METER); + if (!hdr) { + ret = -ENOBUFS; + goto err_genlmsg; + } + + if (nla_put_u32(msg, BATADV_ATTR_TPMETER_COOKIE, cookie)) + goto nla_put_failure; + + if (nla_put_u32(msg, BATADV_ATTR_TPMETER_TEST_TIME, test_time)) + goto nla_put_failure; + + if (nla_put_u64_64bit(msg, BATADV_ATTR_TPMETER_BYTES, total_bytes, + BATADV_ATTR_PAD)) + goto nla_put_failure; + + if (nla_put_u8(msg, BATADV_ATTR_TPMETER_RESULT, result)) + goto nla_put_failure; + + if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, dst)) + goto nla_put_failure; + + genlmsg_end(msg, hdr); + + genlmsg_multicast_netns(&batadv_netlink_family, + dev_net(bat_priv->soft_iface), msg, 0, + BATADV_NL_MCGRP_TPMETER, GFP_KERNEL); + + return 0; + +nla_put_failure: + genlmsg_cancel(msg, hdr); + ret = -EMSGSIZE; + +err_genlmsg: + nlmsg_free(msg); + return ret; +} + +/** + * batadv_netlink_tp_meter_start() - Start a new tp_meter session + * @skb: received netlink message + * @info: receiver information + * + * Return: 0 on success, < 0 on error + */ +static int +batadv_netlink_tp_meter_start(struct sk_buff *skb, struct genl_info *info) +{ + struct batadv_priv *bat_priv = info->user_ptr[0]; + struct sk_buff *msg = NULL; + u32 test_length; + void *msg_head; + u32 cookie; + u8 *dst; + int ret; + + if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS]) + return -EINVAL; + + if (!info->attrs[BATADV_ATTR_TPMETER_TEST_TIME]) + return -EINVAL; + + dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]); + + test_length = nla_get_u32(info->attrs[BATADV_ATTR_TPMETER_TEST_TIME]); + + msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); + if (!msg) { + ret = -ENOMEM; + goto out; + } + + msg_head = genlmsg_put(msg, info->snd_portid, info->snd_seq, + &batadv_netlink_family, 0, + BATADV_CMD_TP_METER); + if (!msg_head) { + ret = -ENOBUFS; + goto out; + } + + batadv_tp_start(bat_priv, dst, test_length, &cookie); + + ret = batadv_netlink_tp_meter_put(msg, cookie); + + out: + if (ret) { + if (msg) + nlmsg_free(msg); + return ret; + } + + genlmsg_end(msg, msg_head); + return genlmsg_reply(msg, info); +} + +/** + * batadv_netlink_tp_meter_cancel() - Cancel a running tp_meter session + * @skb: received netlink message + * @info: receiver information + * + * Return: 0 on success, < 0 on error + */ +static int +batadv_netlink_tp_meter_cancel(struct sk_buff *skb, struct genl_info *info) +{ + struct batadv_priv *bat_priv = info->user_ptr[0]; + u8 *dst; + int ret = 0; + + if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS]) + return -EINVAL; + + dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]); + + batadv_tp_stop(bat_priv, dst, BATADV_TP_REASON_CANCEL); + + return ret; +} + +/** + * batadv_netlink_hardif_fill() - Fill message with hardif attributes + * @msg: Netlink message to dump into + * @bat_priv: the bat priv with all the soft interface information + * @hard_iface: hard interface which was modified + * @cmd: type of message to generate + * @portid: Port making netlink request + * @seq: sequence number for message + * @flags: Additional flags for message + * @cb: Control block containing additional options + * + * Return: 0 on success or negative error number in case of failure + */ +static int batadv_netlink_hardif_fill(struct sk_buff *msg, + struct batadv_priv *bat_priv, + struct batadv_hard_iface *hard_iface, + enum batadv_nl_commands cmd, + u32 portid, u32 seq, int flags, + struct netlink_callback *cb) +{ + struct net_device *net_dev = hard_iface->net_dev; + void *hdr; + + hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, flags, cmd); + if (!hdr) + return -ENOBUFS; + + if (cb) + genl_dump_check_consistent(cb, hdr); + + if (nla_put_u32(msg, BATADV_ATTR_MESH_IFINDEX, + bat_priv->soft_iface->ifindex)) + goto nla_put_failure; + + if (nla_put_string(msg, BATADV_ATTR_MESH_IFNAME, + bat_priv->soft_iface->name)) + goto nla_put_failure; + + if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX, + net_dev->ifindex) || + nla_put_string(msg, BATADV_ATTR_HARD_IFNAME, + net_dev->name) || + nla_put(msg, BATADV_ATTR_HARD_ADDRESS, ETH_ALEN, + net_dev->dev_addr)) + goto nla_put_failure; + + if (hard_iface->if_status == BATADV_IF_ACTIVE) { + if (nla_put_flag(msg, BATADV_ATTR_ACTIVE)) + goto nla_put_failure; + } + + if (nla_put_u8(msg, BATADV_ATTR_HOP_PENALTY, + atomic_read(&hard_iface->hop_penalty))) + goto nla_put_failure; + +#ifdef CONFIG_BATMAN_ADV_BATMAN_V + if (nla_put_u32(msg, BATADV_ATTR_ELP_INTERVAL, + atomic_read(&hard_iface->bat_v.elp_interval))) + goto nla_put_failure; + + if (nla_put_u32(msg, BATADV_ATTR_THROUGHPUT_OVERRIDE, + atomic_read(&hard_iface->bat_v.throughput_override))) + goto nla_put_failure; +#endif /* CONFIG_BATMAN_ADV_BATMAN_V */ + + genlmsg_end(msg, hdr); + return 0; + +nla_put_failure: + genlmsg_cancel(msg, hdr); + return -EMSGSIZE; +} + +/** + * batadv_netlink_notify_hardif() - send hardif attributes to listener + * @bat_priv: the bat priv with all the soft interface information + * @hard_iface: hard interface which was modified + * + * Return: 0 on success, < 0 on error + */ +int batadv_netlink_notify_hardif(struct batadv_priv *bat_priv, + struct batadv_hard_iface *hard_iface) +{ + struct sk_buff *msg; + int ret; + + msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); + if (!msg) + return -ENOMEM; + + ret = batadv_netlink_hardif_fill(msg, bat_priv, hard_iface, + BATADV_CMD_SET_HARDIF, 0, 0, 0, NULL); + if (ret < 0) { + nlmsg_free(msg); + return ret; + } + + genlmsg_multicast_netns(&batadv_netlink_family, + dev_net(bat_priv->soft_iface), msg, 0, + BATADV_NL_MCGRP_CONFIG, GFP_KERNEL); + + return 0; +} + +/** + * batadv_netlink_get_hardif() - Get hardif attributes + * @skb: Netlink message with request data + * @info: receiver information + * + * Return: 0 on success or negative error number in case of failure + */ +static int batadv_netlink_get_hardif(struct sk_buff *skb, + struct genl_info *info) +{ + struct batadv_hard_iface *hard_iface = info->user_ptr[1]; + struct batadv_priv *bat_priv = info->user_ptr[0]; + struct sk_buff *msg; + int ret; + + msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); + if (!msg) + return -ENOMEM; + + ret = batadv_netlink_hardif_fill(msg, bat_priv, hard_iface, + BATADV_CMD_GET_HARDIF, + info->snd_portid, info->snd_seq, 0, + NULL); + if (ret < 0) { + nlmsg_free(msg); + return ret; + } + + ret = genlmsg_reply(msg, info); + + return ret; +} + +/** + * batadv_netlink_set_hardif() - Set hardif attributes + * @skb: Netlink message with request data + * @info: receiver information + * + * Return: 0 on success or negative error number in case of failure + */ +static int batadv_netlink_set_hardif(struct sk_buff *skb, + struct genl_info *info) +{ + struct batadv_hard_iface *hard_iface = info->user_ptr[1]; + struct batadv_priv *bat_priv = info->user_ptr[0]; + struct nlattr *attr; + + if (info->attrs[BATADV_ATTR_HOP_PENALTY]) { + attr = info->attrs[BATADV_ATTR_HOP_PENALTY]; + + atomic_set(&hard_iface->hop_penalty, nla_get_u8(attr)); + } + +#ifdef CONFIG_BATMAN_ADV_BATMAN_V + + if (info->attrs[BATADV_ATTR_ELP_INTERVAL]) { + attr = info->attrs[BATADV_ATTR_ELP_INTERVAL]; + + atomic_set(&hard_iface->bat_v.elp_interval, nla_get_u32(attr)); + } + + if (info->attrs[BATADV_ATTR_THROUGHPUT_OVERRIDE]) { + attr = info->attrs[BATADV_ATTR_THROUGHPUT_OVERRIDE]; + + atomic_set(&hard_iface->bat_v.throughput_override, + nla_get_u32(attr)); + } +#endif /* CONFIG_BATMAN_ADV_BATMAN_V */ + + batadv_netlink_notify_hardif(bat_priv, hard_iface); + + return 0; +} + +/** + * batadv_netlink_dump_hardif() - Dump all hard interface into a messages + * @msg: Netlink message to dump into + * @cb: Parameters from query + * + * Return: error code, or length of reply message on success + */ +static int +batadv_netlink_dump_hardif(struct sk_buff *msg, struct netlink_callback *cb) +{ + struct net *net = sock_net(cb->skb->sk); + struct net_device *soft_iface; + struct batadv_hard_iface *hard_iface; + struct batadv_priv *bat_priv; + int ifindex; + int portid = NETLINK_CB(cb->skb).portid; + int skip = cb->args[0]; + int i = 0; + + ifindex = batadv_netlink_get_ifindex(cb->nlh, + BATADV_ATTR_MESH_IFINDEX); + if (!ifindex) + return -EINVAL; + + soft_iface = dev_get_by_index(net, ifindex); + if (!soft_iface) + return -ENODEV; + + if (!batadv_softif_is_valid(soft_iface)) { + dev_put(soft_iface); + return -ENODEV; + } + + bat_priv = netdev_priv(soft_iface); + + rtnl_lock(); + cb->seq = batadv_hardif_generation << 1 | 1; + + list_for_each_entry(hard_iface, &batadv_hardif_list, list) { + if (hard_iface->soft_iface != soft_iface) + continue; + + if (i++ < skip) + continue; + + if (batadv_netlink_hardif_fill(msg, bat_priv, hard_iface, + BATADV_CMD_GET_HARDIF, + portid, cb->nlh->nlmsg_seq, + NLM_F_MULTI, cb)) { + i--; + break; + } + } + + rtnl_unlock(); + + dev_put(soft_iface); + + cb->args[0] = i; + + return msg->len; +} + +/** + * batadv_netlink_vlan_fill() - Fill message with vlan attributes + * @msg: Netlink message to dump into + * @bat_priv: the bat priv with all the soft interface information + * @vlan: vlan which was modified + * @cmd: type of message to generate + * @portid: Port making netlink request + * @seq: sequence number for message + * @flags: Additional flags for message + * + * Return: 0 on success or negative error number in case of failure + */ +static int batadv_netlink_vlan_fill(struct sk_buff *msg, + struct batadv_priv *bat_priv, + struct batadv_softif_vlan *vlan, + enum batadv_nl_commands cmd, + u32 portid, u32 seq, int flags) +{ + void *hdr; + + hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, flags, cmd); + if (!hdr) + return -ENOBUFS; + + if (nla_put_u32(msg, BATADV_ATTR_MESH_IFINDEX, + bat_priv->soft_iface->ifindex)) + goto nla_put_failure; + + if (nla_put_string(msg, BATADV_ATTR_MESH_IFNAME, + bat_priv->soft_iface->name)) + goto nla_put_failure; + + if (nla_put_u32(msg, BATADV_ATTR_VLANID, vlan->vid & VLAN_VID_MASK)) + goto nla_put_failure; + + if (nla_put_u8(msg, BATADV_ATTR_AP_ISOLATION_ENABLED, + !!atomic_read(&vlan->ap_isolation))) + goto nla_put_failure; + + genlmsg_end(msg, hdr); + return 0; + +nla_put_failure: + genlmsg_cancel(msg, hdr); + return -EMSGSIZE; +} + +/** + * batadv_netlink_notify_vlan() - send vlan attributes to listener + * @bat_priv: the bat priv with all the soft interface information + * @vlan: vlan which was modified + * + * Return: 0 on success, < 0 on error + */ +int batadv_netlink_notify_vlan(struct batadv_priv *bat_priv, + struct batadv_softif_vlan *vlan) +{ + struct sk_buff *msg; + int ret; + + msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); + if (!msg) + return -ENOMEM; + + ret = batadv_netlink_vlan_fill(msg, bat_priv, vlan, + BATADV_CMD_SET_VLAN, 0, 0, 0); + if (ret < 0) { + nlmsg_free(msg); + return ret; + } + + genlmsg_multicast_netns(&batadv_netlink_family, + dev_net(bat_priv->soft_iface), msg, 0, + BATADV_NL_MCGRP_CONFIG, GFP_KERNEL); + + return 0; +} + +/** + * batadv_netlink_get_vlan() - Get vlan attributes + * @skb: Netlink message with request data + * @info: receiver information + * + * Return: 0 on success or negative error number in case of failure + */ +static int batadv_netlink_get_vlan(struct sk_buff *skb, struct genl_info *info) +{ + struct batadv_softif_vlan *vlan = info->user_ptr[1]; + struct batadv_priv *bat_priv = info->user_ptr[0]; + struct sk_buff *msg; + int ret; + + msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); + if (!msg) + return -ENOMEM; + + ret = batadv_netlink_vlan_fill(msg, bat_priv, vlan, BATADV_CMD_GET_VLAN, + info->snd_portid, info->snd_seq, 0); + if (ret < 0) { + nlmsg_free(msg); + return ret; + } + + ret = genlmsg_reply(msg, info); + + return ret; +} + +/** + * batadv_netlink_set_vlan() - Get vlan attributes + * @skb: Netlink message with request data + * @info: receiver information + * + * Return: 0 on success or negative error number in case of failure + */ +static int batadv_netlink_set_vlan(struct sk_buff *skb, struct genl_info *info) +{ + struct batadv_softif_vlan *vlan = info->user_ptr[1]; + struct batadv_priv *bat_priv = info->user_ptr[0]; + struct nlattr *attr; + + if (info->attrs[BATADV_ATTR_AP_ISOLATION_ENABLED]) { + attr = info->attrs[BATADV_ATTR_AP_ISOLATION_ENABLED]; + + atomic_set(&vlan->ap_isolation, !!nla_get_u8(attr)); + } + + batadv_netlink_notify_vlan(bat_priv, vlan); + + return 0; +} + +/** + * batadv_get_softif_from_info() - Retrieve soft interface from genl attributes + * @net: the applicable net namespace + * @info: receiver information + * + * Return: Pointer to soft interface (with increased refcnt) on success, error + * pointer on error + */ +static struct net_device * +batadv_get_softif_from_info(struct net *net, struct genl_info *info) +{ + struct net_device *soft_iface; + int ifindex; + + if (!info->attrs[BATADV_ATTR_MESH_IFINDEX]) + return ERR_PTR(-EINVAL); + + ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]); + + soft_iface = dev_get_by_index(net, ifindex); + if (!soft_iface) + return ERR_PTR(-ENODEV); + + if (!batadv_softif_is_valid(soft_iface)) + goto err_put_softif; + + return soft_iface; + +err_put_softif: + dev_put(soft_iface); + + return ERR_PTR(-EINVAL); +} + +/** + * batadv_get_hardif_from_info() - Retrieve hardif from genl attributes + * @bat_priv: the bat priv with all the soft interface information + * @net: the applicable net namespace + * @info: receiver information + * + * Return: Pointer to hard interface (with increased refcnt) on success, error + * pointer on error + */ +static struct batadv_hard_iface * +batadv_get_hardif_from_info(struct batadv_priv *bat_priv, struct net *net, + struct genl_info *info) +{ + struct batadv_hard_iface *hard_iface; + struct net_device *hard_dev; + unsigned int hardif_index; + + if (!info->attrs[BATADV_ATTR_HARD_IFINDEX]) + return ERR_PTR(-EINVAL); + + hardif_index = nla_get_u32(info->attrs[BATADV_ATTR_HARD_IFINDEX]); + + hard_dev = dev_get_by_index(net, hardif_index); + if (!hard_dev) + return ERR_PTR(-ENODEV); + + hard_iface = batadv_hardif_get_by_netdev(hard_dev); + if (!hard_iface) + goto err_put_harddev; + + if (hard_iface->soft_iface != bat_priv->soft_iface) + goto err_put_hardif; + + /* hard_dev is referenced by hard_iface and not needed here */ + dev_put(hard_dev); + + return hard_iface; + +err_put_hardif: + batadv_hardif_put(hard_iface); +err_put_harddev: + dev_put(hard_dev); + + return ERR_PTR(-EINVAL); +} + +/** + * batadv_get_vlan_from_info() - Retrieve vlan from genl attributes + * @bat_priv: the bat priv with all the soft interface information + * @net: the applicable net namespace + * @info: receiver information + * + * Return: Pointer to vlan on success (with increased refcnt), error pointer + * on error + */ +static struct batadv_softif_vlan * +batadv_get_vlan_from_info(struct batadv_priv *bat_priv, struct net *net, + struct genl_info *info) +{ + struct batadv_softif_vlan *vlan; + u16 vid; + + if (!info->attrs[BATADV_ATTR_VLANID]) + return ERR_PTR(-EINVAL); + + vid = nla_get_u16(info->attrs[BATADV_ATTR_VLANID]); + + vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG); + if (!vlan) + return ERR_PTR(-ENOENT); + + return vlan; +} + +/** + * batadv_pre_doit() - Prepare batman-adv genl doit request + * @ops: requested netlink operation + * @skb: Netlink message with request data + * @info: receiver information + * + * Return: 0 on success or negative error number in case of failure + */ +static int batadv_pre_doit(const struct genl_ops *ops, struct sk_buff *skb, + struct genl_info *info) +{ + struct net *net = genl_info_net(info); + struct batadv_hard_iface *hard_iface; + struct batadv_priv *bat_priv = NULL; + struct batadv_softif_vlan *vlan; + struct net_device *soft_iface; + u8 user_ptr1_flags; + u8 mesh_dep_flags; + int ret; + + user_ptr1_flags = BATADV_FLAG_NEED_HARDIF | BATADV_FLAG_NEED_VLAN; + if (WARN_ON(hweight8(ops->internal_flags & user_ptr1_flags) > 1)) + return -EINVAL; + + mesh_dep_flags = BATADV_FLAG_NEED_HARDIF | BATADV_FLAG_NEED_VLAN; + if (WARN_ON((ops->internal_flags & mesh_dep_flags) && + (~ops->internal_flags & BATADV_FLAG_NEED_MESH))) + return -EINVAL; + + if (ops->internal_flags & BATADV_FLAG_NEED_MESH) { + soft_iface = batadv_get_softif_from_info(net, info); + if (IS_ERR(soft_iface)) + return PTR_ERR(soft_iface); + + bat_priv = netdev_priv(soft_iface); + info->user_ptr[0] = bat_priv; + } + + if (ops->internal_flags & BATADV_FLAG_NEED_HARDIF) { + hard_iface = batadv_get_hardif_from_info(bat_priv, net, info); + if (IS_ERR(hard_iface)) { + ret = PTR_ERR(hard_iface); + goto err_put_softif; + } + + info->user_ptr[1] = hard_iface; + } + + if (ops->internal_flags & BATADV_FLAG_NEED_VLAN) { + vlan = batadv_get_vlan_from_info(bat_priv, net, info); + if (IS_ERR(vlan)) { + ret = PTR_ERR(vlan); + goto err_put_softif; + } + + info->user_ptr[1] = vlan; + } + + return 0; + +err_put_softif: + if (bat_priv) + dev_put(bat_priv->soft_iface); + + return ret; +} + +/** + * batadv_post_doit() - End batman-adv genl doit request + * @ops: requested netlink operation + * @skb: Netlink message with request data + * @info: receiver information + */ +static void batadv_post_doit(const struct genl_ops *ops, struct sk_buff *skb, + struct genl_info *info) +{ + struct batadv_hard_iface *hard_iface; + struct batadv_softif_vlan *vlan; + struct batadv_priv *bat_priv; + + if (ops->internal_flags & BATADV_FLAG_NEED_HARDIF && + info->user_ptr[1]) { + hard_iface = info->user_ptr[1]; + + batadv_hardif_put(hard_iface); + } + + if (ops->internal_flags & BATADV_FLAG_NEED_VLAN && info->user_ptr[1]) { + vlan = info->user_ptr[1]; + batadv_softif_vlan_put(vlan); + } + + if (ops->internal_flags & BATADV_FLAG_NEED_MESH && info->user_ptr[0]) { + bat_priv = info->user_ptr[0]; + dev_put(bat_priv->soft_iface); + } +} + +static const struct genl_small_ops batadv_netlink_ops[] = { + { + .cmd = BATADV_CMD_GET_MESH, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + /* can be retrieved by unprivileged users */ + .doit = batadv_netlink_get_mesh, + .internal_flags = BATADV_FLAG_NEED_MESH, + }, + { + .cmd = BATADV_CMD_TP_METER, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = GENL_UNS_ADMIN_PERM, + .doit = batadv_netlink_tp_meter_start, + .internal_flags = BATADV_FLAG_NEED_MESH, + }, + { + .cmd = BATADV_CMD_TP_METER_CANCEL, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = GENL_UNS_ADMIN_PERM, + .doit = batadv_netlink_tp_meter_cancel, + .internal_flags = BATADV_FLAG_NEED_MESH, + }, + { + .cmd = BATADV_CMD_GET_ROUTING_ALGOS, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = GENL_UNS_ADMIN_PERM, + .dumpit = batadv_algo_dump, + }, + { + .cmd = BATADV_CMD_GET_HARDIF, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + /* can be retrieved by unprivileged users */ + .dumpit = batadv_netlink_dump_hardif, + .doit = batadv_netlink_get_hardif, + .internal_flags = BATADV_FLAG_NEED_MESH | + BATADV_FLAG_NEED_HARDIF, + }, + { + .cmd = BATADV_CMD_GET_TRANSTABLE_LOCAL, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = GENL_UNS_ADMIN_PERM, + .dumpit = batadv_tt_local_dump, + }, + { + .cmd = BATADV_CMD_GET_TRANSTABLE_GLOBAL, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = GENL_UNS_ADMIN_PERM, + .dumpit = batadv_tt_global_dump, + }, + { + .cmd = BATADV_CMD_GET_ORIGINATORS, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = GENL_UNS_ADMIN_PERM, + .dumpit = batadv_orig_dump, + }, + { + .cmd = BATADV_CMD_GET_NEIGHBORS, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = GENL_UNS_ADMIN_PERM, + .dumpit = batadv_hardif_neigh_dump, + }, + { + .cmd = BATADV_CMD_GET_GATEWAYS, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = GENL_UNS_ADMIN_PERM, + .dumpit = batadv_gw_dump, + }, + { + .cmd = BATADV_CMD_GET_BLA_CLAIM, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = GENL_UNS_ADMIN_PERM, + .dumpit = batadv_bla_claim_dump, + }, + { + .cmd = BATADV_CMD_GET_BLA_BACKBONE, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = GENL_UNS_ADMIN_PERM, + .dumpit = batadv_bla_backbone_dump, + }, + { + .cmd = BATADV_CMD_GET_DAT_CACHE, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = GENL_UNS_ADMIN_PERM, + .dumpit = batadv_dat_cache_dump, + }, + { + .cmd = BATADV_CMD_GET_MCAST_FLAGS, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = GENL_UNS_ADMIN_PERM, + .dumpit = batadv_mcast_flags_dump, + }, + { + .cmd = BATADV_CMD_SET_MESH, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = GENL_UNS_ADMIN_PERM, + .doit = batadv_netlink_set_mesh, + .internal_flags = BATADV_FLAG_NEED_MESH, + }, + { + .cmd = BATADV_CMD_SET_HARDIF, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = GENL_UNS_ADMIN_PERM, + .doit = batadv_netlink_set_hardif, + .internal_flags = BATADV_FLAG_NEED_MESH | + BATADV_FLAG_NEED_HARDIF, + }, + { + .cmd = BATADV_CMD_GET_VLAN, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + /* can be retrieved by unprivileged users */ + .doit = batadv_netlink_get_vlan, + .internal_flags = BATADV_FLAG_NEED_MESH | + BATADV_FLAG_NEED_VLAN, + }, + { + .cmd = BATADV_CMD_SET_VLAN, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = GENL_UNS_ADMIN_PERM, + .doit = batadv_netlink_set_vlan, + .internal_flags = BATADV_FLAG_NEED_MESH | + BATADV_FLAG_NEED_VLAN, + }, +}; + +struct genl_family batadv_netlink_family __ro_after_init = { + .hdrsize = 0, + .name = BATADV_NL_NAME, + .version = 1, + .maxattr = BATADV_ATTR_MAX, + .policy = batadv_netlink_policy, + .netnsok = true, + .pre_doit = batadv_pre_doit, + .post_doit = batadv_post_doit, + .module = THIS_MODULE, + .small_ops = batadv_netlink_ops, + .n_small_ops = ARRAY_SIZE(batadv_netlink_ops), + .resv_start_op = BATADV_CMD_SET_VLAN + 1, + .mcgrps = batadv_netlink_mcgrps, + .n_mcgrps = ARRAY_SIZE(batadv_netlink_mcgrps), +}; + +/** + * batadv_netlink_register() - register batadv genl netlink family + */ +void __init batadv_netlink_register(void) +{ + int ret; + + ret = genl_register_family(&batadv_netlink_family); + if (ret) + pr_warn("unable to register netlink family"); +} + +/** + * batadv_netlink_unregister() - unregister batadv genl netlink family + */ +void batadv_netlink_unregister(void) +{ + genl_unregister_family(&batadv_netlink_family); +} diff --git a/net/batman-adv/netlink.h b/net/batman-adv/netlink.h new file mode 100644 index 000000000..48102cc74 --- /dev/null +++ b/net/batman-adv/netlink.h @@ -0,0 +1,32 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Matthias Schiffer + */ + +#ifndef _NET_BATMAN_ADV_NETLINK_H_ +#define _NET_BATMAN_ADV_NETLINK_H_ + +#include "main.h" + +#include <linux/netlink.h> +#include <linux/types.h> +#include <net/genetlink.h> + +void batadv_netlink_register(void); +void batadv_netlink_unregister(void); +int batadv_netlink_get_ifindex(const struct nlmsghdr *nlh, int attrtype); + +int batadv_netlink_tpmeter_notify(struct batadv_priv *bat_priv, const u8 *dst, + u8 result, u32 test_time, u64 total_bytes, + u32 cookie); + +int batadv_netlink_notify_mesh(struct batadv_priv *bat_priv); +int batadv_netlink_notify_hardif(struct batadv_priv *bat_priv, + struct batadv_hard_iface *hard_iface); +int batadv_netlink_notify_vlan(struct batadv_priv *bat_priv, + struct batadv_softif_vlan *vlan); + +extern struct genl_family batadv_netlink_family; + +#endif /* _NET_BATMAN_ADV_NETLINK_H_ */ diff --git a/net/batman-adv/network-coding.c b/net/batman-adv/network-coding.c new file mode 100644 index 000000000..5f4aeeb60 --- /dev/null +++ b/net/batman-adv/network-coding.c @@ -0,0 +1,1873 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Martin Hundebøll, Jeppe Ledet-Pedersen + */ + +#include "network-coding.h" +#include "main.h" + +#include <linux/atomic.h> +#include <linux/bitops.h> +#include <linux/byteorder/generic.h> +#include <linux/compiler.h> +#include <linux/container_of.h> +#include <linux/errno.h> +#include <linux/etherdevice.h> +#include <linux/gfp.h> +#include <linux/if_ether.h> +#include <linux/if_packet.h> +#include <linux/init.h> +#include <linux/jhash.h> +#include <linux/jiffies.h> +#include <linux/kref.h> +#include <linux/list.h> +#include <linux/lockdep.h> +#include <linux/net.h> +#include <linux/netdevice.h> +#include <linux/prandom.h> +#include <linux/printk.h> +#include <linux/rculist.h> +#include <linux/rcupdate.h> +#include <linux/skbuff.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/stddef.h> +#include <linux/string.h> +#include <linux/workqueue.h> +#include <uapi/linux/batadv_packet.h> + +#include "hash.h" +#include "log.h" +#include "originator.h" +#include "routing.h" +#include "send.h" +#include "tvlv.h" + +static struct lock_class_key batadv_nc_coding_hash_lock_class_key; +static struct lock_class_key batadv_nc_decoding_hash_lock_class_key; + +static void batadv_nc_worker(struct work_struct *work); +static int batadv_nc_recv_coded_packet(struct sk_buff *skb, + struct batadv_hard_iface *recv_if); + +/** + * batadv_nc_init() - one-time initialization for network coding + * + * Return: 0 on success or negative error number in case of failure + */ +int __init batadv_nc_init(void) +{ + /* Register our packet type */ + return batadv_recv_handler_register(BATADV_CODED, + batadv_nc_recv_coded_packet); +} + +/** + * batadv_nc_start_timer() - initialise the nc periodic worker + * @bat_priv: the bat priv with all the soft interface information + */ +static void batadv_nc_start_timer(struct batadv_priv *bat_priv) +{ + queue_delayed_work(batadv_event_workqueue, &bat_priv->nc.work, + msecs_to_jiffies(10)); +} + +/** + * batadv_nc_tvlv_container_update() - update the network coding tvlv container + * after network coding setting change + * @bat_priv: the bat priv with all the soft interface information + */ +static void batadv_nc_tvlv_container_update(struct batadv_priv *bat_priv) +{ + char nc_mode; + + nc_mode = atomic_read(&bat_priv->network_coding); + + switch (nc_mode) { + case 0: + batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_NC, 1); + break; + case 1: + batadv_tvlv_container_register(bat_priv, BATADV_TVLV_NC, 1, + NULL, 0); + break; + } +} + +/** + * batadv_nc_status_update() - update the network coding tvlv container after + * network coding setting change + * @net_dev: the soft interface net device + */ +void batadv_nc_status_update(struct net_device *net_dev) +{ + struct batadv_priv *bat_priv = netdev_priv(net_dev); + + batadv_nc_tvlv_container_update(bat_priv); +} + +/** + * batadv_nc_tvlv_ogm_handler_v1() - process incoming nc tvlv container + * @bat_priv: the bat priv with all the soft interface information + * @orig: the orig_node of the ogm + * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) + * @tvlv_value: tvlv buffer containing the gateway data + * @tvlv_value_len: tvlv buffer length + */ +static void batadv_nc_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig, + u8 flags, + void *tvlv_value, u16 tvlv_value_len) +{ + if (flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) + clear_bit(BATADV_ORIG_CAPA_HAS_NC, &orig->capabilities); + else + set_bit(BATADV_ORIG_CAPA_HAS_NC, &orig->capabilities); +} + +/** + * batadv_nc_mesh_init() - initialise coding hash table and start housekeeping + * @bat_priv: the bat priv with all the soft interface information + * + * Return: 0 on success or negative error number in case of failure + */ +int batadv_nc_mesh_init(struct batadv_priv *bat_priv) +{ + bat_priv->nc.timestamp_fwd_flush = jiffies; + bat_priv->nc.timestamp_sniffed_purge = jiffies; + + if (bat_priv->nc.coding_hash || bat_priv->nc.decoding_hash) + return 0; + + bat_priv->nc.coding_hash = batadv_hash_new(128); + if (!bat_priv->nc.coding_hash) + goto err; + + batadv_hash_set_lock_class(bat_priv->nc.coding_hash, + &batadv_nc_coding_hash_lock_class_key); + + bat_priv->nc.decoding_hash = batadv_hash_new(128); + if (!bat_priv->nc.decoding_hash) { + batadv_hash_destroy(bat_priv->nc.coding_hash); + goto err; + } + + batadv_hash_set_lock_class(bat_priv->nc.decoding_hash, + &batadv_nc_decoding_hash_lock_class_key); + + INIT_DELAYED_WORK(&bat_priv->nc.work, batadv_nc_worker); + batadv_nc_start_timer(bat_priv); + + batadv_tvlv_handler_register(bat_priv, batadv_nc_tvlv_ogm_handler_v1, + NULL, BATADV_TVLV_NC, 1, + BATADV_TVLV_HANDLER_OGM_CIFNOTFND); + batadv_nc_tvlv_container_update(bat_priv); + return 0; + +err: + return -ENOMEM; +} + +/** + * batadv_nc_init_bat_priv() - initialise the nc specific bat_priv variables + * @bat_priv: the bat priv with all the soft interface information + */ +void batadv_nc_init_bat_priv(struct batadv_priv *bat_priv) +{ + atomic_set(&bat_priv->network_coding, 0); + bat_priv->nc.min_tq = 200; + bat_priv->nc.max_fwd_delay = 10; + bat_priv->nc.max_buffer_time = 200; +} + +/** + * batadv_nc_init_orig() - initialise the nc fields of an orig_node + * @orig_node: the orig_node which is going to be initialised + */ +void batadv_nc_init_orig(struct batadv_orig_node *orig_node) +{ + INIT_LIST_HEAD(&orig_node->in_coding_list); + INIT_LIST_HEAD(&orig_node->out_coding_list); + spin_lock_init(&orig_node->in_coding_list_lock); + spin_lock_init(&orig_node->out_coding_list_lock); +} + +/** + * batadv_nc_node_release() - release nc_node from lists and queue for free + * after rcu grace period + * @ref: kref pointer of the nc_node + */ +static void batadv_nc_node_release(struct kref *ref) +{ + struct batadv_nc_node *nc_node; + + nc_node = container_of(ref, struct batadv_nc_node, refcount); + + batadv_orig_node_put(nc_node->orig_node); + kfree_rcu(nc_node, rcu); +} + +/** + * batadv_nc_node_put() - decrement the nc_node refcounter and possibly + * release it + * @nc_node: nc_node to be free'd + */ +static void batadv_nc_node_put(struct batadv_nc_node *nc_node) +{ + if (!nc_node) + return; + + kref_put(&nc_node->refcount, batadv_nc_node_release); +} + +/** + * batadv_nc_path_release() - release nc_path from lists and queue for free + * after rcu grace period + * @ref: kref pointer of the nc_path + */ +static void batadv_nc_path_release(struct kref *ref) +{ + struct batadv_nc_path *nc_path; + + nc_path = container_of(ref, struct batadv_nc_path, refcount); + + kfree_rcu(nc_path, rcu); +} + +/** + * batadv_nc_path_put() - decrement the nc_path refcounter and possibly + * release it + * @nc_path: nc_path to be free'd + */ +static void batadv_nc_path_put(struct batadv_nc_path *nc_path) +{ + if (!nc_path) + return; + + kref_put(&nc_path->refcount, batadv_nc_path_release); +} + +/** + * batadv_nc_packet_free() - frees nc packet + * @nc_packet: the nc packet to free + * @dropped: whether the packet is freed because is dropped + */ +static void batadv_nc_packet_free(struct batadv_nc_packet *nc_packet, + bool dropped) +{ + if (dropped) + kfree_skb(nc_packet->skb); + else + consume_skb(nc_packet->skb); + + batadv_nc_path_put(nc_packet->nc_path); + kfree(nc_packet); +} + +/** + * batadv_nc_to_purge_nc_node() - checks whether an nc node has to be purged + * @bat_priv: the bat priv with all the soft interface information + * @nc_node: the nc node to check + * + * Return: true if the entry has to be purged now, false otherwise + */ +static bool batadv_nc_to_purge_nc_node(struct batadv_priv *bat_priv, + struct batadv_nc_node *nc_node) +{ + if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) + return true; + + return batadv_has_timed_out(nc_node->last_seen, BATADV_NC_NODE_TIMEOUT); +} + +/** + * batadv_nc_to_purge_nc_path_coding() - checks whether an nc path has timed out + * @bat_priv: the bat priv with all the soft interface information + * @nc_path: the nc path to check + * + * Return: true if the entry has to be purged now, false otherwise + */ +static bool batadv_nc_to_purge_nc_path_coding(struct batadv_priv *bat_priv, + struct batadv_nc_path *nc_path) +{ + if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) + return true; + + /* purge the path when no packets has been added for 10 times the + * max_fwd_delay time + */ + return batadv_has_timed_out(nc_path->last_valid, + bat_priv->nc.max_fwd_delay * 10); +} + +/** + * batadv_nc_to_purge_nc_path_decoding() - checks whether an nc path has timed + * out + * @bat_priv: the bat priv with all the soft interface information + * @nc_path: the nc path to check + * + * Return: true if the entry has to be purged now, false otherwise + */ +static bool batadv_nc_to_purge_nc_path_decoding(struct batadv_priv *bat_priv, + struct batadv_nc_path *nc_path) +{ + if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) + return true; + + /* purge the path when no packets has been added for 10 times the + * max_buffer time + */ + return batadv_has_timed_out(nc_path->last_valid, + bat_priv->nc.max_buffer_time * 10); +} + +/** + * batadv_nc_purge_orig_nc_nodes() - go through list of nc nodes and purge stale + * entries + * @bat_priv: the bat priv with all the soft interface information + * @list: list of nc nodes + * @lock: nc node list lock + * @to_purge: function in charge to decide whether an entry has to be purged or + * not. This function takes the nc node as argument and has to return + * a boolean value: true if the entry has to be deleted, false + * otherwise + */ +static void +batadv_nc_purge_orig_nc_nodes(struct batadv_priv *bat_priv, + struct list_head *list, + spinlock_t *lock, + bool (*to_purge)(struct batadv_priv *, + struct batadv_nc_node *)) +{ + struct batadv_nc_node *nc_node, *nc_node_tmp; + + /* For each nc_node in list */ + spin_lock_bh(lock); + list_for_each_entry_safe(nc_node, nc_node_tmp, list, list) { + /* if an helper function has been passed as parameter, + * ask it if the entry has to be purged or not + */ + if (to_purge && !to_purge(bat_priv, nc_node)) + continue; + + batadv_dbg(BATADV_DBG_NC, bat_priv, + "Removing nc_node %pM -> %pM\n", + nc_node->addr, nc_node->orig_node->orig); + list_del_rcu(&nc_node->list); + batadv_nc_node_put(nc_node); + } + spin_unlock_bh(lock); +} + +/** + * batadv_nc_purge_orig() - purges all nc node data attached of the given + * originator + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: orig_node with the nc node entries to be purged + * @to_purge: function in charge to decide whether an entry has to be purged or + * not. This function takes the nc node as argument and has to return + * a boolean value: true is the entry has to be deleted, false + * otherwise + */ +void batadv_nc_purge_orig(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + bool (*to_purge)(struct batadv_priv *, + struct batadv_nc_node *)) +{ + /* Check ingoing nc_node's of this orig_node */ + batadv_nc_purge_orig_nc_nodes(bat_priv, &orig_node->in_coding_list, + &orig_node->in_coding_list_lock, + to_purge); + + /* Check outgoing nc_node's of this orig_node */ + batadv_nc_purge_orig_nc_nodes(bat_priv, &orig_node->out_coding_list, + &orig_node->out_coding_list_lock, + to_purge); +} + +/** + * batadv_nc_purge_orig_hash() - traverse entire originator hash to check if + * they have timed out nc nodes + * @bat_priv: the bat priv with all the soft interface information + */ +static void batadv_nc_purge_orig_hash(struct batadv_priv *bat_priv) +{ + struct batadv_hashtable *hash = bat_priv->orig_hash; + struct hlist_head *head; + struct batadv_orig_node *orig_node; + u32 i; + + if (!hash) + return; + + /* For each orig_node */ + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + rcu_read_lock(); + hlist_for_each_entry_rcu(orig_node, head, hash_entry) + batadv_nc_purge_orig(bat_priv, orig_node, + batadv_nc_to_purge_nc_node); + rcu_read_unlock(); + } +} + +/** + * batadv_nc_purge_paths() - traverse all nc paths part of the hash and remove + * unused ones + * @bat_priv: the bat priv with all the soft interface information + * @hash: hash table containing the nc paths to check + * @to_purge: function in charge to decide whether an entry has to be purged or + * not. This function takes the nc node as argument and has to return + * a boolean value: true is the entry has to be deleted, false + * otherwise + */ +static void batadv_nc_purge_paths(struct batadv_priv *bat_priv, + struct batadv_hashtable *hash, + bool (*to_purge)(struct batadv_priv *, + struct batadv_nc_path *)) +{ + struct hlist_head *head; + struct hlist_node *node_tmp; + struct batadv_nc_path *nc_path; + spinlock_t *lock; /* Protects lists in hash */ + u32 i; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + lock = &hash->list_locks[i]; + + /* For each nc_path in this bin */ + spin_lock_bh(lock); + hlist_for_each_entry_safe(nc_path, node_tmp, head, hash_entry) { + /* if an helper function has been passed as parameter, + * ask it if the entry has to be purged or not + */ + if (to_purge && !to_purge(bat_priv, nc_path)) + continue; + + /* purging an non-empty nc_path should never happen, but + * is observed under high CPU load. Delay the purging + * until next iteration to allow the packet_list to be + * emptied first. + */ + if (!unlikely(list_empty(&nc_path->packet_list))) { + net_ratelimited_function(printk, + KERN_WARNING + "Skipping free of non-empty nc_path (%pM -> %pM)!\n", + nc_path->prev_hop, + nc_path->next_hop); + continue; + } + + /* nc_path is unused, so remove it */ + batadv_dbg(BATADV_DBG_NC, bat_priv, + "Remove nc_path %pM -> %pM\n", + nc_path->prev_hop, nc_path->next_hop); + hlist_del_rcu(&nc_path->hash_entry); + batadv_nc_path_put(nc_path); + } + spin_unlock_bh(lock); + } +} + +/** + * batadv_nc_hash_key_gen() - computes the nc_path hash key + * @key: buffer to hold the final hash key + * @src: source ethernet mac address going into the hash key + * @dst: destination ethernet mac address going into the hash key + */ +static void batadv_nc_hash_key_gen(struct batadv_nc_path *key, const char *src, + const char *dst) +{ + memcpy(key->prev_hop, src, sizeof(key->prev_hop)); + memcpy(key->next_hop, dst, sizeof(key->next_hop)); +} + +/** + * batadv_nc_hash_choose() - compute the hash value for an nc path + * @data: data to hash + * @size: size of the hash table + * + * Return: the selected index in the hash table for the given data. + */ +static u32 batadv_nc_hash_choose(const void *data, u32 size) +{ + const struct batadv_nc_path *nc_path = data; + u32 hash = 0; + + hash = jhash(&nc_path->prev_hop, sizeof(nc_path->prev_hop), hash); + hash = jhash(&nc_path->next_hop, sizeof(nc_path->next_hop), hash); + + return hash % size; +} + +/** + * batadv_nc_hash_compare() - comparing function used in the network coding hash + * tables + * @node: node in the local table + * @data2: second object to compare the node to + * + * Return: true if the two entry are the same, false otherwise + */ +static bool batadv_nc_hash_compare(const struct hlist_node *node, + const void *data2) +{ + const struct batadv_nc_path *nc_path1, *nc_path2; + + nc_path1 = container_of(node, struct batadv_nc_path, hash_entry); + nc_path2 = data2; + + /* Return 1 if the two keys are identical */ + if (!batadv_compare_eth(nc_path1->prev_hop, nc_path2->prev_hop)) + return false; + + if (!batadv_compare_eth(nc_path1->next_hop, nc_path2->next_hop)) + return false; + + return true; +} + +/** + * batadv_nc_hash_find() - search for an existing nc path and return it + * @hash: hash table containing the nc path + * @data: search key + * + * Return: the nc_path if found, NULL otherwise. + */ +static struct batadv_nc_path * +batadv_nc_hash_find(struct batadv_hashtable *hash, + void *data) +{ + struct hlist_head *head; + struct batadv_nc_path *nc_path, *nc_path_tmp = NULL; + int index; + + if (!hash) + return NULL; + + index = batadv_nc_hash_choose(data, hash->size); + head = &hash->table[index]; + + rcu_read_lock(); + hlist_for_each_entry_rcu(nc_path, head, hash_entry) { + if (!batadv_nc_hash_compare(&nc_path->hash_entry, data)) + continue; + + if (!kref_get_unless_zero(&nc_path->refcount)) + continue; + + nc_path_tmp = nc_path; + break; + } + rcu_read_unlock(); + + return nc_path_tmp; +} + +/** + * batadv_nc_send_packet() - send non-coded packet and free nc_packet struct + * @nc_packet: the nc packet to send + */ +static void batadv_nc_send_packet(struct batadv_nc_packet *nc_packet) +{ + batadv_send_unicast_skb(nc_packet->skb, nc_packet->neigh_node); + nc_packet->skb = NULL; + batadv_nc_packet_free(nc_packet, false); +} + +/** + * batadv_nc_sniffed_purge() - Checks timestamp of given sniffed nc_packet. + * @bat_priv: the bat priv with all the soft interface information + * @nc_path: the nc path the packet belongs to + * @nc_packet: the nc packet to be checked + * + * Checks whether the given sniffed (overheard) nc_packet has hit its buffering + * timeout. If so, the packet is no longer kept and the entry deleted from the + * queue. Has to be called with the appropriate locks. + * + * Return: false as soon as the entry in the fifo queue has not been timed out + * yet and true otherwise. + */ +static bool batadv_nc_sniffed_purge(struct batadv_priv *bat_priv, + struct batadv_nc_path *nc_path, + struct batadv_nc_packet *nc_packet) +{ + unsigned long timeout = bat_priv->nc.max_buffer_time; + bool res = false; + + lockdep_assert_held(&nc_path->packet_list_lock); + + /* Packets are added to tail, so the remaining packets did not time + * out and we can stop processing the current queue + */ + if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE && + !batadv_has_timed_out(nc_packet->timestamp, timeout)) + goto out; + + /* purge nc packet */ + list_del(&nc_packet->list); + batadv_nc_packet_free(nc_packet, true); + + res = true; + +out: + return res; +} + +/** + * batadv_nc_fwd_flush() - Checks the timestamp of the given nc packet. + * @bat_priv: the bat priv with all the soft interface information + * @nc_path: the nc path the packet belongs to + * @nc_packet: the nc packet to be checked + * + * Checks whether the given nc packet has hit its forward timeout. If so, the + * packet is no longer delayed, immediately sent and the entry deleted from the + * queue. Has to be called with the appropriate locks. + * + * Return: false as soon as the entry in the fifo queue has not been timed out + * yet and true otherwise. + */ +static bool batadv_nc_fwd_flush(struct batadv_priv *bat_priv, + struct batadv_nc_path *nc_path, + struct batadv_nc_packet *nc_packet) +{ + unsigned long timeout = bat_priv->nc.max_fwd_delay; + + lockdep_assert_held(&nc_path->packet_list_lock); + + /* Packets are added to tail, so the remaining packets did not time + * out and we can stop processing the current queue + */ + if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE && + !batadv_has_timed_out(nc_packet->timestamp, timeout)) + return false; + + /* Send packet */ + batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); + batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, + nc_packet->skb->len + ETH_HLEN); + list_del(&nc_packet->list); + batadv_nc_send_packet(nc_packet); + + return true; +} + +/** + * batadv_nc_process_nc_paths() - traverse given nc packet pool and free timed + * out nc packets + * @bat_priv: the bat priv with all the soft interface information + * @hash: to be processed hash table + * @process_fn: Function called to process given nc packet. Should return true + * to encourage this function to proceed with the next packet. + * Otherwise the rest of the current queue is skipped. + */ +static void +batadv_nc_process_nc_paths(struct batadv_priv *bat_priv, + struct batadv_hashtable *hash, + bool (*process_fn)(struct batadv_priv *, + struct batadv_nc_path *, + struct batadv_nc_packet *)) +{ + struct hlist_head *head; + struct batadv_nc_packet *nc_packet, *nc_packet_tmp; + struct batadv_nc_path *nc_path; + bool ret; + int i; + + if (!hash) + return; + + /* Loop hash table bins */ + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + /* Loop coding paths */ + rcu_read_lock(); + hlist_for_each_entry_rcu(nc_path, head, hash_entry) { + /* Loop packets */ + spin_lock_bh(&nc_path->packet_list_lock); + list_for_each_entry_safe(nc_packet, nc_packet_tmp, + &nc_path->packet_list, list) { + ret = process_fn(bat_priv, nc_path, nc_packet); + if (!ret) + break; + } + spin_unlock_bh(&nc_path->packet_list_lock); + } + rcu_read_unlock(); + } +} + +/** + * batadv_nc_worker() - periodic task for housekeeping related to network + * coding + * @work: kernel work struct + */ +static void batadv_nc_worker(struct work_struct *work) +{ + struct delayed_work *delayed_work; + struct batadv_priv_nc *priv_nc; + struct batadv_priv *bat_priv; + unsigned long timeout; + + delayed_work = to_delayed_work(work); + priv_nc = container_of(delayed_work, struct batadv_priv_nc, work); + bat_priv = container_of(priv_nc, struct batadv_priv, nc); + + batadv_nc_purge_orig_hash(bat_priv); + batadv_nc_purge_paths(bat_priv, bat_priv->nc.coding_hash, + batadv_nc_to_purge_nc_path_coding); + batadv_nc_purge_paths(bat_priv, bat_priv->nc.decoding_hash, + batadv_nc_to_purge_nc_path_decoding); + + timeout = bat_priv->nc.max_fwd_delay; + + if (batadv_has_timed_out(bat_priv->nc.timestamp_fwd_flush, timeout)) { + batadv_nc_process_nc_paths(bat_priv, bat_priv->nc.coding_hash, + batadv_nc_fwd_flush); + bat_priv->nc.timestamp_fwd_flush = jiffies; + } + + if (batadv_has_timed_out(bat_priv->nc.timestamp_sniffed_purge, + bat_priv->nc.max_buffer_time)) { + batadv_nc_process_nc_paths(bat_priv, bat_priv->nc.decoding_hash, + batadv_nc_sniffed_purge); + bat_priv->nc.timestamp_sniffed_purge = jiffies; + } + + /* Schedule a new check */ + batadv_nc_start_timer(bat_priv); +} + +/** + * batadv_can_nc_with_orig() - checks whether the given orig node is suitable + * for coding or not + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: neighboring orig node which may be used as nc candidate + * @ogm_packet: incoming ogm packet also used for the checks + * + * Return: true if: + * 1) The OGM must have the most recent sequence number. + * 2) The TTL must be decremented by one and only one. + * 3) The OGM must be received from the first hop from orig_node. + * 4) The TQ value of the OGM must be above bat_priv->nc.min_tq. + */ +static bool batadv_can_nc_with_orig(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + struct batadv_ogm_packet *ogm_packet) +{ + struct batadv_orig_ifinfo *orig_ifinfo; + u32 last_real_seqno; + u8 last_ttl; + + orig_ifinfo = batadv_orig_ifinfo_get(orig_node, BATADV_IF_DEFAULT); + if (!orig_ifinfo) + return false; + + last_ttl = orig_ifinfo->last_ttl; + last_real_seqno = orig_ifinfo->last_real_seqno; + batadv_orig_ifinfo_put(orig_ifinfo); + + if (last_real_seqno != ntohl(ogm_packet->seqno)) + return false; + if (last_ttl != ogm_packet->ttl + 1) + return false; + if (!batadv_compare_eth(ogm_packet->orig, ogm_packet->prev_sender)) + return false; + if (ogm_packet->tq < bat_priv->nc.min_tq) + return false; + + return true; +} + +/** + * batadv_nc_find_nc_node() - search for an existing nc node and return it + * @orig_node: orig node originating the ogm packet + * @orig_neigh_node: neighboring orig node from which we received the ogm packet + * (can be equal to orig_node) + * @in_coding: traverse incoming or outgoing network coding list + * + * Return: the nc_node if found, NULL otherwise. + */ +static struct batadv_nc_node * +batadv_nc_find_nc_node(struct batadv_orig_node *orig_node, + struct batadv_orig_node *orig_neigh_node, + bool in_coding) +{ + struct batadv_nc_node *nc_node, *nc_node_out = NULL; + struct list_head *list; + + if (in_coding) + list = &orig_neigh_node->in_coding_list; + else + list = &orig_neigh_node->out_coding_list; + + /* Traverse list of nc_nodes to orig_node */ + rcu_read_lock(); + list_for_each_entry_rcu(nc_node, list, list) { + if (!batadv_compare_eth(nc_node->addr, orig_node->orig)) + continue; + + if (!kref_get_unless_zero(&nc_node->refcount)) + continue; + + /* Found a match */ + nc_node_out = nc_node; + break; + } + rcu_read_unlock(); + + return nc_node_out; +} + +/** + * batadv_nc_get_nc_node() - retrieves an nc node or creates the entry if it was + * not found + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: orig node originating the ogm packet + * @orig_neigh_node: neighboring orig node from which we received the ogm packet + * (can be equal to orig_node) + * @in_coding: traverse incoming or outgoing network coding list + * + * Return: the nc_node if found or created, NULL in case of an error. + */ +static struct batadv_nc_node * +batadv_nc_get_nc_node(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + struct batadv_orig_node *orig_neigh_node, + bool in_coding) +{ + struct batadv_nc_node *nc_node; + spinlock_t *lock; /* Used to lock list selected by "int in_coding" */ + struct list_head *list; + + /* Select ingoing or outgoing coding node */ + if (in_coding) { + lock = &orig_neigh_node->in_coding_list_lock; + list = &orig_neigh_node->in_coding_list; + } else { + lock = &orig_neigh_node->out_coding_list_lock; + list = &orig_neigh_node->out_coding_list; + } + + spin_lock_bh(lock); + + /* Check if nc_node is already added */ + nc_node = batadv_nc_find_nc_node(orig_node, orig_neigh_node, in_coding); + + /* Node found */ + if (nc_node) + goto unlock; + + nc_node = kzalloc(sizeof(*nc_node), GFP_ATOMIC); + if (!nc_node) + goto unlock; + + /* Initialize nc_node */ + INIT_LIST_HEAD(&nc_node->list); + kref_init(&nc_node->refcount); + ether_addr_copy(nc_node->addr, orig_node->orig); + kref_get(&orig_neigh_node->refcount); + nc_node->orig_node = orig_neigh_node; + + batadv_dbg(BATADV_DBG_NC, bat_priv, "Adding nc_node %pM -> %pM\n", + nc_node->addr, nc_node->orig_node->orig); + + /* Add nc_node to orig_node */ + kref_get(&nc_node->refcount); + list_add_tail_rcu(&nc_node->list, list); + +unlock: + spin_unlock_bh(lock); + + return nc_node; +} + +/** + * batadv_nc_update_nc_node() - updates stored incoming and outgoing nc node + * structs (best called on incoming OGMs) + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: orig node originating the ogm packet + * @orig_neigh_node: neighboring orig node from which we received the ogm packet + * (can be equal to orig_node) + * @ogm_packet: incoming ogm packet + * @is_single_hop_neigh: orig_node is a single hop neighbor + */ +void batadv_nc_update_nc_node(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + struct batadv_orig_node *orig_neigh_node, + struct batadv_ogm_packet *ogm_packet, + int is_single_hop_neigh) +{ + struct batadv_nc_node *in_nc_node = NULL; + struct batadv_nc_node *out_nc_node = NULL; + + /* Check if network coding is enabled */ + if (!atomic_read(&bat_priv->network_coding)) + goto out; + + /* check if orig node is network coding enabled */ + if (!test_bit(BATADV_ORIG_CAPA_HAS_NC, &orig_node->capabilities)) + goto out; + + /* accept ogms from 'good' neighbors and single hop neighbors */ + if (!batadv_can_nc_with_orig(bat_priv, orig_node, ogm_packet) && + !is_single_hop_neigh) + goto out; + + /* Add orig_node as in_nc_node on hop */ + in_nc_node = batadv_nc_get_nc_node(bat_priv, orig_node, + orig_neigh_node, true); + if (!in_nc_node) + goto out; + + in_nc_node->last_seen = jiffies; + + /* Add hop as out_nc_node on orig_node */ + out_nc_node = batadv_nc_get_nc_node(bat_priv, orig_neigh_node, + orig_node, false); + if (!out_nc_node) + goto out; + + out_nc_node->last_seen = jiffies; + +out: + batadv_nc_node_put(in_nc_node); + batadv_nc_node_put(out_nc_node); +} + +/** + * batadv_nc_get_path() - get existing nc_path or allocate a new one + * @bat_priv: the bat priv with all the soft interface information + * @hash: hash table containing the nc path + * @src: ethernet source address - first half of the nc path search key + * @dst: ethernet destination address - second half of the nc path search key + * + * Return: pointer to nc_path if the path was found or created, returns NULL + * on error. + */ +static struct batadv_nc_path *batadv_nc_get_path(struct batadv_priv *bat_priv, + struct batadv_hashtable *hash, + u8 *src, + u8 *dst) +{ + int hash_added; + struct batadv_nc_path *nc_path, nc_path_key; + + batadv_nc_hash_key_gen(&nc_path_key, src, dst); + + /* Search for existing nc_path */ + nc_path = batadv_nc_hash_find(hash, (void *)&nc_path_key); + + if (nc_path) { + /* Set timestamp to delay removal of nc_path */ + nc_path->last_valid = jiffies; + return nc_path; + } + + /* No existing nc_path was found; create a new */ + nc_path = kzalloc(sizeof(*nc_path), GFP_ATOMIC); + + if (!nc_path) + return NULL; + + /* Initialize nc_path */ + INIT_LIST_HEAD(&nc_path->packet_list); + spin_lock_init(&nc_path->packet_list_lock); + kref_init(&nc_path->refcount); + nc_path->last_valid = jiffies; + ether_addr_copy(nc_path->next_hop, dst); + ether_addr_copy(nc_path->prev_hop, src); + + batadv_dbg(BATADV_DBG_NC, bat_priv, "Adding nc_path %pM -> %pM\n", + nc_path->prev_hop, + nc_path->next_hop); + + /* Add nc_path to hash table */ + kref_get(&nc_path->refcount); + hash_added = batadv_hash_add(hash, batadv_nc_hash_compare, + batadv_nc_hash_choose, &nc_path_key, + &nc_path->hash_entry); + + if (hash_added < 0) { + kfree(nc_path); + return NULL; + } + + return nc_path; +} + +/** + * batadv_nc_random_weight_tq() - scale the receivers TQ-value to avoid unfair + * selection of a receiver with slightly lower TQ than the other + * @tq: to be weighted tq value + * + * Return: scaled tq value + */ +static u8 batadv_nc_random_weight_tq(u8 tq) +{ + /* randomize the estimated packet loss (max TQ - estimated TQ) */ + u8 rand_tq = prandom_u32_max(BATADV_TQ_MAX_VALUE + 1 - tq); + + /* convert to (randomized) estimated tq again */ + return BATADV_TQ_MAX_VALUE - rand_tq; +} + +/** + * batadv_nc_memxor() - XOR destination with source + * @dst: byte array to XOR into + * @src: byte array to XOR from + * @len: length of destination array + */ +static void batadv_nc_memxor(char *dst, const char *src, unsigned int len) +{ + unsigned int i; + + for (i = 0; i < len; ++i) + dst[i] ^= src[i]; +} + +/** + * batadv_nc_code_packets() - code a received unicast_packet with an nc packet + * into a coded_packet and send it + * @bat_priv: the bat priv with all the soft interface information + * @skb: data skb to forward + * @ethhdr: pointer to the ethernet header inside the skb + * @nc_packet: structure containing the packet to the skb can be coded with + * @neigh_node: next hop to forward packet to + * + * Return: true if both packets are consumed, false otherwise. + */ +static bool batadv_nc_code_packets(struct batadv_priv *bat_priv, + struct sk_buff *skb, + struct ethhdr *ethhdr, + struct batadv_nc_packet *nc_packet, + struct batadv_neigh_node *neigh_node) +{ + u8 tq_weighted_neigh, tq_weighted_coding, tq_tmp; + struct sk_buff *skb_dest, *skb_src; + struct batadv_unicast_packet *packet1; + struct batadv_unicast_packet *packet2; + struct batadv_coded_packet *coded_packet; + struct batadv_neigh_node *neigh_tmp, *router_neigh, *first_dest; + struct batadv_neigh_node *router_coding = NULL, *second_dest; + struct batadv_neigh_ifinfo *router_neigh_ifinfo = NULL; + struct batadv_neigh_ifinfo *router_coding_ifinfo = NULL; + u8 *first_source, *second_source; + __be32 packet_id1, packet_id2; + size_t count; + bool res = false; + int coding_len; + int unicast_size = sizeof(*packet1); + int coded_size = sizeof(*coded_packet); + int header_add = coded_size - unicast_size; + + /* TODO: do we need to consider the outgoing interface for + * coded packets? + */ + router_neigh = batadv_orig_router_get(neigh_node->orig_node, + BATADV_IF_DEFAULT); + if (!router_neigh) + goto out; + + router_neigh_ifinfo = batadv_neigh_ifinfo_get(router_neigh, + BATADV_IF_DEFAULT); + if (!router_neigh_ifinfo) + goto out; + + neigh_tmp = nc_packet->neigh_node; + router_coding = batadv_orig_router_get(neigh_tmp->orig_node, + BATADV_IF_DEFAULT); + if (!router_coding) + goto out; + + router_coding_ifinfo = batadv_neigh_ifinfo_get(router_coding, + BATADV_IF_DEFAULT); + if (!router_coding_ifinfo) + goto out; + + tq_tmp = router_neigh_ifinfo->bat_iv.tq_avg; + tq_weighted_neigh = batadv_nc_random_weight_tq(tq_tmp); + tq_tmp = router_coding_ifinfo->bat_iv.tq_avg; + tq_weighted_coding = batadv_nc_random_weight_tq(tq_tmp); + + /* Select one destination for the MAC-header dst-field based on + * weighted TQ-values. + */ + if (tq_weighted_neigh >= tq_weighted_coding) { + /* Destination from nc_packet is selected for MAC-header */ + first_dest = nc_packet->neigh_node; + first_source = nc_packet->nc_path->prev_hop; + second_dest = neigh_node; + second_source = ethhdr->h_source; + packet1 = (struct batadv_unicast_packet *)nc_packet->skb->data; + packet2 = (struct batadv_unicast_packet *)skb->data; + packet_id1 = nc_packet->packet_id; + packet_id2 = batadv_skb_crc32(skb, + skb->data + sizeof(*packet2)); + } else { + /* Destination for skb is selected for MAC-header */ + first_dest = neigh_node; + first_source = ethhdr->h_source; + second_dest = nc_packet->neigh_node; + second_source = nc_packet->nc_path->prev_hop; + packet1 = (struct batadv_unicast_packet *)skb->data; + packet2 = (struct batadv_unicast_packet *)nc_packet->skb->data; + packet_id1 = batadv_skb_crc32(skb, + skb->data + sizeof(*packet1)); + packet_id2 = nc_packet->packet_id; + } + + /* Instead of zero padding the smallest data buffer, we + * code into the largest. + */ + if (skb->len <= nc_packet->skb->len) { + skb_dest = nc_packet->skb; + skb_src = skb; + } else { + skb_dest = skb; + skb_src = nc_packet->skb; + } + + /* coding_len is used when decoding the packet shorter packet */ + coding_len = skb_src->len - unicast_size; + + if (skb_linearize(skb_dest) < 0 || skb_linearize(skb_src) < 0) + goto out; + + skb_push(skb_dest, header_add); + + coded_packet = (struct batadv_coded_packet *)skb_dest->data; + skb_reset_mac_header(skb_dest); + + coded_packet->packet_type = BATADV_CODED; + coded_packet->version = BATADV_COMPAT_VERSION; + coded_packet->ttl = packet1->ttl; + + /* Info about first unicast packet */ + ether_addr_copy(coded_packet->first_source, first_source); + ether_addr_copy(coded_packet->first_orig_dest, packet1->dest); + coded_packet->first_crc = packet_id1; + coded_packet->first_ttvn = packet1->ttvn; + + /* Info about second unicast packet */ + ether_addr_copy(coded_packet->second_dest, second_dest->addr); + ether_addr_copy(coded_packet->second_source, second_source); + ether_addr_copy(coded_packet->second_orig_dest, packet2->dest); + coded_packet->second_crc = packet_id2; + coded_packet->second_ttl = packet2->ttl; + coded_packet->second_ttvn = packet2->ttvn; + coded_packet->coded_len = htons(coding_len); + + /* This is where the magic happens: Code skb_src into skb_dest */ + batadv_nc_memxor(skb_dest->data + coded_size, + skb_src->data + unicast_size, coding_len); + + /* Update counters accordingly */ + if (BATADV_SKB_CB(skb_src)->decoded && + BATADV_SKB_CB(skb_dest)->decoded) { + /* Both packets are recoded */ + count = skb_src->len + ETH_HLEN; + count += skb_dest->len + ETH_HLEN; + batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE, 2); + batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES, count); + } else if (!BATADV_SKB_CB(skb_src)->decoded && + !BATADV_SKB_CB(skb_dest)->decoded) { + /* Both packets are newly coded */ + count = skb_src->len + ETH_HLEN; + count += skb_dest->len + ETH_HLEN; + batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE, 2); + batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES, count); + } else if (BATADV_SKB_CB(skb_src)->decoded && + !BATADV_SKB_CB(skb_dest)->decoded) { + /* skb_src recoded and skb_dest is newly coded */ + batadv_inc_counter(bat_priv, BATADV_CNT_NC_RECODE); + batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES, + skb_src->len + ETH_HLEN); + batadv_inc_counter(bat_priv, BATADV_CNT_NC_CODE); + batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES, + skb_dest->len + ETH_HLEN); + } else if (!BATADV_SKB_CB(skb_src)->decoded && + BATADV_SKB_CB(skb_dest)->decoded) { + /* skb_src is newly coded and skb_dest is recoded */ + batadv_inc_counter(bat_priv, BATADV_CNT_NC_CODE); + batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES, + skb_src->len + ETH_HLEN); + batadv_inc_counter(bat_priv, BATADV_CNT_NC_RECODE); + batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES, + skb_dest->len + ETH_HLEN); + } + + /* skb_src is now coded into skb_dest, so free it */ + consume_skb(skb_src); + + /* avoid duplicate free of skb from nc_packet */ + nc_packet->skb = NULL; + batadv_nc_packet_free(nc_packet, false); + + /* Send the coded packet and return true */ + batadv_send_unicast_skb(skb_dest, first_dest); + res = true; +out: + batadv_neigh_node_put(router_neigh); + batadv_neigh_node_put(router_coding); + batadv_neigh_ifinfo_put(router_neigh_ifinfo); + batadv_neigh_ifinfo_put(router_coding_ifinfo); + return res; +} + +/** + * batadv_nc_skb_coding_possible() - true if a decoded skb is available at dst. + * @skb: data skb to forward + * @dst: destination mac address of the other skb to code with + * @src: source mac address of skb + * + * Whenever we network code a packet we have to check whether we received it in + * a network coded form. If so, we may not be able to use it for coding because + * some neighbors may also have received (overheard) the packet in the network + * coded form without being able to decode it. It is hard to know which of the + * neighboring nodes was able to decode the packet, therefore we can only + * re-code the packet if the source of the previous encoded packet is involved. + * Since the source encoded the packet we can be certain it has all necessary + * decode information. + * + * Return: true if coding of a decoded packet is allowed. + */ +static bool batadv_nc_skb_coding_possible(struct sk_buff *skb, u8 *dst, u8 *src) +{ + if (BATADV_SKB_CB(skb)->decoded && !batadv_compare_eth(dst, src)) + return false; + return true; +} + +/** + * batadv_nc_path_search() - Find the coding path matching in_nc_node and + * out_nc_node to retrieve a buffered packet that can be used for coding. + * @bat_priv: the bat priv with all the soft interface information + * @in_nc_node: pointer to skb next hop's neighbor nc node + * @out_nc_node: pointer to skb source's neighbor nc node + * @skb: data skb to forward + * @eth_dst: next hop mac address of skb + * + * Return: true if coding of a decoded skb is allowed. + */ +static struct batadv_nc_packet * +batadv_nc_path_search(struct batadv_priv *bat_priv, + struct batadv_nc_node *in_nc_node, + struct batadv_nc_node *out_nc_node, + struct sk_buff *skb, + u8 *eth_dst) +{ + struct batadv_nc_path *nc_path, nc_path_key; + struct batadv_nc_packet *nc_packet_out = NULL; + struct batadv_nc_packet *nc_packet, *nc_packet_tmp; + struct batadv_hashtable *hash = bat_priv->nc.coding_hash; + int idx; + + if (!hash) + return NULL; + + /* Create almost path key */ + batadv_nc_hash_key_gen(&nc_path_key, in_nc_node->addr, + out_nc_node->addr); + idx = batadv_nc_hash_choose(&nc_path_key, hash->size); + + /* Check for coding opportunities in this nc_path */ + rcu_read_lock(); + hlist_for_each_entry_rcu(nc_path, &hash->table[idx], hash_entry) { + if (!batadv_compare_eth(nc_path->prev_hop, in_nc_node->addr)) + continue; + + if (!batadv_compare_eth(nc_path->next_hop, out_nc_node->addr)) + continue; + + spin_lock_bh(&nc_path->packet_list_lock); + if (list_empty(&nc_path->packet_list)) { + spin_unlock_bh(&nc_path->packet_list_lock); + continue; + } + + list_for_each_entry_safe(nc_packet, nc_packet_tmp, + &nc_path->packet_list, list) { + if (!batadv_nc_skb_coding_possible(nc_packet->skb, + eth_dst, + in_nc_node->addr)) + continue; + + /* Coding opportunity is found! */ + list_del(&nc_packet->list); + nc_packet_out = nc_packet; + break; + } + + spin_unlock_bh(&nc_path->packet_list_lock); + break; + } + rcu_read_unlock(); + + return nc_packet_out; +} + +/** + * batadv_nc_skb_src_search() - Loops through the list of neighboring nodes of + * the skb's sender (may be equal to the originator). + * @bat_priv: the bat priv with all the soft interface information + * @skb: data skb to forward + * @eth_dst: next hop mac address of skb + * @eth_src: source mac address of skb + * @in_nc_node: pointer to skb next hop's neighbor nc node + * + * Return: an nc packet if a suitable coding packet was found, NULL otherwise. + */ +static struct batadv_nc_packet * +batadv_nc_skb_src_search(struct batadv_priv *bat_priv, + struct sk_buff *skb, + u8 *eth_dst, + u8 *eth_src, + struct batadv_nc_node *in_nc_node) +{ + struct batadv_orig_node *orig_node; + struct batadv_nc_node *out_nc_node; + struct batadv_nc_packet *nc_packet = NULL; + + orig_node = batadv_orig_hash_find(bat_priv, eth_src); + if (!orig_node) + return NULL; + + rcu_read_lock(); + list_for_each_entry_rcu(out_nc_node, + &orig_node->out_coding_list, list) { + /* Check if the skb is decoded and if recoding is possible */ + if (!batadv_nc_skb_coding_possible(skb, + out_nc_node->addr, eth_src)) + continue; + + /* Search for an opportunity in this nc_path */ + nc_packet = batadv_nc_path_search(bat_priv, in_nc_node, + out_nc_node, skb, eth_dst); + if (nc_packet) + break; + } + rcu_read_unlock(); + + batadv_orig_node_put(orig_node); + return nc_packet; +} + +/** + * batadv_nc_skb_store_before_coding() - set the ethernet src and dst of the + * unicast skb before it is stored for use in later decoding + * @bat_priv: the bat priv with all the soft interface information + * @skb: data skb to store + * @eth_dst_new: new destination mac address of skb + */ +static void batadv_nc_skb_store_before_coding(struct batadv_priv *bat_priv, + struct sk_buff *skb, + u8 *eth_dst_new) +{ + struct ethhdr *ethhdr; + + /* Copy skb header to change the mac header */ + skb = pskb_copy_for_clone(skb, GFP_ATOMIC); + if (!skb) + return; + + /* Set the mac header as if we actually sent the packet uncoded */ + ethhdr = eth_hdr(skb); + ether_addr_copy(ethhdr->h_source, ethhdr->h_dest); + ether_addr_copy(ethhdr->h_dest, eth_dst_new); + + /* Set data pointer to MAC header to mimic packets from our tx path */ + skb_push(skb, ETH_HLEN); + + /* Add the packet to the decoding packet pool */ + batadv_nc_skb_store_for_decoding(bat_priv, skb); + + /* batadv_nc_skb_store_for_decoding() clones the skb, so we must free + * our ref + */ + consume_skb(skb); +} + +/** + * batadv_nc_skb_dst_search() - Loops through list of neighboring nodes to dst. + * @skb: data skb to forward + * @neigh_node: next hop to forward packet to + * @ethhdr: pointer to the ethernet header inside the skb + * + * Loops through the list of neighboring nodes the next hop has a good + * connection to (receives OGMs with a sufficient quality). We need to find a + * neighbor of our next hop that potentially sent a packet which our next hop + * also received (overheard) and has stored for later decoding. + * + * Return: true if the skb was consumed (encoded packet sent) or false otherwise + */ +static bool batadv_nc_skb_dst_search(struct sk_buff *skb, + struct batadv_neigh_node *neigh_node, + struct ethhdr *ethhdr) +{ + struct net_device *netdev = neigh_node->if_incoming->soft_iface; + struct batadv_priv *bat_priv = netdev_priv(netdev); + struct batadv_orig_node *orig_node = neigh_node->orig_node; + struct batadv_nc_node *nc_node; + struct batadv_nc_packet *nc_packet = NULL; + + rcu_read_lock(); + list_for_each_entry_rcu(nc_node, &orig_node->in_coding_list, list) { + /* Search for coding opportunity with this in_nc_node */ + nc_packet = batadv_nc_skb_src_search(bat_priv, skb, + neigh_node->addr, + ethhdr->h_source, nc_node); + + /* Opportunity was found, so stop searching */ + if (nc_packet) + break; + } + rcu_read_unlock(); + + if (!nc_packet) + return false; + + /* Save packets for later decoding */ + batadv_nc_skb_store_before_coding(bat_priv, skb, + neigh_node->addr); + batadv_nc_skb_store_before_coding(bat_priv, nc_packet->skb, + nc_packet->neigh_node->addr); + + /* Code and send packets */ + if (batadv_nc_code_packets(bat_priv, skb, ethhdr, nc_packet, + neigh_node)) + return true; + + /* out of mem ? Coding failed - we have to free the buffered packet + * to avoid memleaks. The skb passed as argument will be dealt with + * by the calling function. + */ + batadv_nc_send_packet(nc_packet); + return false; +} + +/** + * batadv_nc_skb_add_to_path() - buffer skb for later encoding / decoding + * @skb: skb to add to path + * @nc_path: path to add skb to + * @neigh_node: next hop to forward packet to + * @packet_id: checksum to identify packet + * + * Return: true if the packet was buffered or false in case of an error. + */ +static bool batadv_nc_skb_add_to_path(struct sk_buff *skb, + struct batadv_nc_path *nc_path, + struct batadv_neigh_node *neigh_node, + __be32 packet_id) +{ + struct batadv_nc_packet *nc_packet; + + nc_packet = kzalloc(sizeof(*nc_packet), GFP_ATOMIC); + if (!nc_packet) + return false; + + /* Initialize nc_packet */ + nc_packet->timestamp = jiffies; + nc_packet->packet_id = packet_id; + nc_packet->skb = skb; + nc_packet->neigh_node = neigh_node; + nc_packet->nc_path = nc_path; + + /* Add coding packet to list */ + spin_lock_bh(&nc_path->packet_list_lock); + list_add_tail(&nc_packet->list, &nc_path->packet_list); + spin_unlock_bh(&nc_path->packet_list_lock); + + return true; +} + +/** + * batadv_nc_skb_forward() - try to code a packet or add it to the coding packet + * buffer + * @skb: data skb to forward + * @neigh_node: next hop to forward packet to + * + * Return: true if the skb was consumed (encoded packet sent) or false otherwise + */ +bool batadv_nc_skb_forward(struct sk_buff *skb, + struct batadv_neigh_node *neigh_node) +{ + const struct net_device *netdev = neigh_node->if_incoming->soft_iface; + struct batadv_priv *bat_priv = netdev_priv(netdev); + struct batadv_unicast_packet *packet; + struct batadv_nc_path *nc_path; + struct ethhdr *ethhdr = eth_hdr(skb); + __be32 packet_id; + u8 *payload; + + /* Check if network coding is enabled */ + if (!atomic_read(&bat_priv->network_coding)) + goto out; + + /* We only handle unicast packets */ + payload = skb_network_header(skb); + packet = (struct batadv_unicast_packet *)payload; + if (packet->packet_type != BATADV_UNICAST) + goto out; + + /* Try to find a coding opportunity and send the skb if one is found */ + if (batadv_nc_skb_dst_search(skb, neigh_node, ethhdr)) + return true; + + /* Find or create a nc_path for this src-dst pair */ + nc_path = batadv_nc_get_path(bat_priv, + bat_priv->nc.coding_hash, + ethhdr->h_source, + neigh_node->addr); + + if (!nc_path) + goto out; + + /* Add skb to nc_path */ + packet_id = batadv_skb_crc32(skb, payload + sizeof(*packet)); + if (!batadv_nc_skb_add_to_path(skb, nc_path, neigh_node, packet_id)) + goto free_nc_path; + + /* Packet is consumed */ + return true; + +free_nc_path: + batadv_nc_path_put(nc_path); +out: + /* Packet is not consumed */ + return false; +} + +/** + * batadv_nc_skb_store_for_decoding() - save a clone of the skb which can be + * used when decoding coded packets + * @bat_priv: the bat priv with all the soft interface information + * @skb: data skb to store + */ +void batadv_nc_skb_store_for_decoding(struct batadv_priv *bat_priv, + struct sk_buff *skb) +{ + struct batadv_unicast_packet *packet; + struct batadv_nc_path *nc_path; + struct ethhdr *ethhdr = eth_hdr(skb); + __be32 packet_id; + u8 *payload; + + /* Check if network coding is enabled */ + if (!atomic_read(&bat_priv->network_coding)) + goto out; + + /* Check for supported packet type */ + payload = skb_network_header(skb); + packet = (struct batadv_unicast_packet *)payload; + if (packet->packet_type != BATADV_UNICAST) + goto out; + + /* Find existing nc_path or create a new */ + nc_path = batadv_nc_get_path(bat_priv, + bat_priv->nc.decoding_hash, + ethhdr->h_source, + ethhdr->h_dest); + + if (!nc_path) + goto out; + + /* Clone skb and adjust skb->data to point at batman header */ + skb = skb_clone(skb, GFP_ATOMIC); + if (unlikely(!skb)) + goto free_nc_path; + + if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) + goto free_skb; + + if (unlikely(!skb_pull_rcsum(skb, ETH_HLEN))) + goto free_skb; + + /* Add skb to nc_path */ + packet_id = batadv_skb_crc32(skb, payload + sizeof(*packet)); + if (!batadv_nc_skb_add_to_path(skb, nc_path, NULL, packet_id)) + goto free_skb; + + batadv_inc_counter(bat_priv, BATADV_CNT_NC_BUFFER); + return; + +free_skb: + kfree_skb(skb); +free_nc_path: + batadv_nc_path_put(nc_path); +out: + return; +} + +/** + * batadv_nc_skb_store_sniffed_unicast() - check if a received unicast packet + * should be saved in the decoding buffer and, if so, store it there + * @bat_priv: the bat priv with all the soft interface information + * @skb: unicast skb to store + */ +void batadv_nc_skb_store_sniffed_unicast(struct batadv_priv *bat_priv, + struct sk_buff *skb) +{ + struct ethhdr *ethhdr = eth_hdr(skb); + + if (batadv_is_my_mac(bat_priv, ethhdr->h_dest)) + return; + + /* Set data pointer to MAC header to mimic packets from our tx path */ + skb_push(skb, ETH_HLEN); + + batadv_nc_skb_store_for_decoding(bat_priv, skb); +} + +/** + * batadv_nc_skb_decode_packet() - decode given skb using the decode data stored + * in nc_packet + * @bat_priv: the bat priv with all the soft interface information + * @skb: unicast skb to decode + * @nc_packet: decode data needed to decode the skb + * + * Return: pointer to decoded unicast packet if the packet was decoded or NULL + * in case of an error. + */ +static struct batadv_unicast_packet * +batadv_nc_skb_decode_packet(struct batadv_priv *bat_priv, struct sk_buff *skb, + struct batadv_nc_packet *nc_packet) +{ + const int h_size = sizeof(struct batadv_unicast_packet); + const int h_diff = sizeof(struct batadv_coded_packet) - h_size; + struct batadv_unicast_packet *unicast_packet; + struct batadv_coded_packet coded_packet_tmp; + struct ethhdr *ethhdr, ethhdr_tmp; + u8 *orig_dest, ttl, ttvn; + unsigned int coding_len; + int err; + + /* Save headers temporarily */ + memcpy(&coded_packet_tmp, skb->data, sizeof(coded_packet_tmp)); + memcpy(ðhdr_tmp, skb_mac_header(skb), sizeof(ethhdr_tmp)); + + if (skb_cow(skb, 0) < 0) + return NULL; + + if (unlikely(!skb_pull_rcsum(skb, h_diff))) + return NULL; + + /* Data points to batman header, so set mac header 14 bytes before + * and network to data + */ + skb_set_mac_header(skb, -ETH_HLEN); + skb_reset_network_header(skb); + + /* Reconstruct original mac header */ + ethhdr = eth_hdr(skb); + *ethhdr = ethhdr_tmp; + + /* Select the correct unicast header information based on the location + * of our mac address in the coded_packet header + */ + if (batadv_is_my_mac(bat_priv, coded_packet_tmp.second_dest)) { + /* If we are the second destination the packet was overheard, + * so the Ethernet address must be copied to h_dest and + * pkt_type changed from PACKET_OTHERHOST to PACKET_HOST + */ + ether_addr_copy(ethhdr->h_dest, coded_packet_tmp.second_dest); + skb->pkt_type = PACKET_HOST; + + orig_dest = coded_packet_tmp.second_orig_dest; + ttl = coded_packet_tmp.second_ttl; + ttvn = coded_packet_tmp.second_ttvn; + } else { + orig_dest = coded_packet_tmp.first_orig_dest; + ttl = coded_packet_tmp.ttl; + ttvn = coded_packet_tmp.first_ttvn; + } + + coding_len = ntohs(coded_packet_tmp.coded_len); + + if (coding_len > skb->len) + return NULL; + + /* Here the magic is reversed: + * extract the missing packet from the received coded packet + */ + batadv_nc_memxor(skb->data + h_size, + nc_packet->skb->data + h_size, + coding_len); + + /* Resize decoded skb if decoded with larger packet */ + if (nc_packet->skb->len > coding_len + h_size) { + err = pskb_trim_rcsum(skb, coding_len + h_size); + if (err) + return NULL; + } + + /* Create decoded unicast packet */ + unicast_packet = (struct batadv_unicast_packet *)skb->data; + unicast_packet->packet_type = BATADV_UNICAST; + unicast_packet->version = BATADV_COMPAT_VERSION; + unicast_packet->ttl = ttl; + ether_addr_copy(unicast_packet->dest, orig_dest); + unicast_packet->ttvn = ttvn; + + batadv_nc_packet_free(nc_packet, false); + return unicast_packet; +} + +/** + * batadv_nc_find_decoding_packet() - search through buffered decoding data to + * find the data needed to decode the coded packet + * @bat_priv: the bat priv with all the soft interface information + * @ethhdr: pointer to the ethernet header inside the coded packet + * @coded: coded packet we try to find decode data for + * + * Return: pointer to nc packet if the needed data was found or NULL otherwise. + */ +static struct batadv_nc_packet * +batadv_nc_find_decoding_packet(struct batadv_priv *bat_priv, + struct ethhdr *ethhdr, + struct batadv_coded_packet *coded) +{ + struct batadv_hashtable *hash = bat_priv->nc.decoding_hash; + struct batadv_nc_packet *tmp_nc_packet, *nc_packet = NULL; + struct batadv_nc_path *nc_path, nc_path_key; + u8 *dest, *source; + __be32 packet_id; + int index; + + if (!hash) + return NULL; + + /* Select the correct packet id based on the location of our mac-addr */ + dest = ethhdr->h_source; + if (!batadv_is_my_mac(bat_priv, coded->second_dest)) { + source = coded->second_source; + packet_id = coded->second_crc; + } else { + source = coded->first_source; + packet_id = coded->first_crc; + } + + batadv_nc_hash_key_gen(&nc_path_key, source, dest); + index = batadv_nc_hash_choose(&nc_path_key, hash->size); + + /* Search for matching coding path */ + rcu_read_lock(); + hlist_for_each_entry_rcu(nc_path, &hash->table[index], hash_entry) { + /* Find matching nc_packet */ + spin_lock_bh(&nc_path->packet_list_lock); + list_for_each_entry(tmp_nc_packet, + &nc_path->packet_list, list) { + if (packet_id == tmp_nc_packet->packet_id) { + list_del(&tmp_nc_packet->list); + + nc_packet = tmp_nc_packet; + break; + } + } + spin_unlock_bh(&nc_path->packet_list_lock); + + if (nc_packet) + break; + } + rcu_read_unlock(); + + if (!nc_packet) + batadv_dbg(BATADV_DBG_NC, bat_priv, + "No decoding packet found for %u\n", packet_id); + + return nc_packet; +} + +/** + * batadv_nc_recv_coded_packet() - try to decode coded packet and enqueue the + * resulting unicast packet + * @skb: incoming coded packet + * @recv_if: pointer to interface this packet was received on + * + * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP + * otherwise. + */ +static int batadv_nc_recv_coded_packet(struct sk_buff *skb, + struct batadv_hard_iface *recv_if) +{ + struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); + struct batadv_unicast_packet *unicast_packet; + struct batadv_coded_packet *coded_packet; + struct batadv_nc_packet *nc_packet; + struct ethhdr *ethhdr; + int hdr_size = sizeof(*coded_packet); + + /* Check if network coding is enabled */ + if (!atomic_read(&bat_priv->network_coding)) + goto free_skb; + + /* Make sure we can access (and remove) header */ + if (unlikely(!pskb_may_pull(skb, hdr_size))) + goto free_skb; + + coded_packet = (struct batadv_coded_packet *)skb->data; + ethhdr = eth_hdr(skb); + + /* Verify frame is destined for us */ + if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest) && + !batadv_is_my_mac(bat_priv, coded_packet->second_dest)) + goto free_skb; + + /* Update stat counter */ + if (batadv_is_my_mac(bat_priv, coded_packet->second_dest)) + batadv_inc_counter(bat_priv, BATADV_CNT_NC_SNIFFED); + + nc_packet = batadv_nc_find_decoding_packet(bat_priv, ethhdr, + coded_packet); + if (!nc_packet) { + batadv_inc_counter(bat_priv, BATADV_CNT_NC_DECODE_FAILED); + goto free_skb; + } + + /* Make skb's linear, because decoding accesses the entire buffer */ + if (skb_linearize(skb) < 0) + goto free_nc_packet; + + if (skb_linearize(nc_packet->skb) < 0) + goto free_nc_packet; + + /* Decode the packet */ + unicast_packet = batadv_nc_skb_decode_packet(bat_priv, skb, nc_packet); + if (!unicast_packet) { + batadv_inc_counter(bat_priv, BATADV_CNT_NC_DECODE_FAILED); + goto free_nc_packet; + } + + /* Mark packet as decoded to do correct recoding when forwarding */ + BATADV_SKB_CB(skb)->decoded = true; + batadv_inc_counter(bat_priv, BATADV_CNT_NC_DECODE); + batadv_add_counter(bat_priv, BATADV_CNT_NC_DECODE_BYTES, + skb->len + ETH_HLEN); + return batadv_recv_unicast_packet(skb, recv_if); + +free_nc_packet: + batadv_nc_packet_free(nc_packet, true); +free_skb: + kfree_skb(skb); + + return NET_RX_DROP; +} + +/** + * batadv_nc_mesh_free() - clean up network coding memory + * @bat_priv: the bat priv with all the soft interface information + */ +void batadv_nc_mesh_free(struct batadv_priv *bat_priv) +{ + batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_NC, 1); + batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_NC, 1); + cancel_delayed_work_sync(&bat_priv->nc.work); + + batadv_nc_purge_paths(bat_priv, bat_priv->nc.coding_hash, NULL); + batadv_hash_destroy(bat_priv->nc.coding_hash); + batadv_nc_purge_paths(bat_priv, bat_priv->nc.decoding_hash, NULL); + batadv_hash_destroy(bat_priv->nc.decoding_hash); +} diff --git a/net/batman-adv/network-coding.h b/net/batman-adv/network-coding.h new file mode 100644 index 000000000..368cc3130 --- /dev/null +++ b/net/batman-adv/network-coding.h @@ -0,0 +1,106 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Martin Hundebøll, Jeppe Ledet-Pedersen + */ + +#ifndef _NET_BATMAN_ADV_NETWORK_CODING_H_ +#define _NET_BATMAN_ADV_NETWORK_CODING_H_ + +#include "main.h" + +#include <linux/netdevice.h> +#include <linux/skbuff.h> +#include <linux/types.h> +#include <uapi/linux/batadv_packet.h> + +#ifdef CONFIG_BATMAN_ADV_NC + +void batadv_nc_status_update(struct net_device *net_dev); +int batadv_nc_init(void); +int batadv_nc_mesh_init(struct batadv_priv *bat_priv); +void batadv_nc_mesh_free(struct batadv_priv *bat_priv); +void batadv_nc_update_nc_node(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + struct batadv_orig_node *orig_neigh_node, + struct batadv_ogm_packet *ogm_packet, + int is_single_hop_neigh); +void batadv_nc_purge_orig(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + bool (*to_purge)(struct batadv_priv *, + struct batadv_nc_node *)); +void batadv_nc_init_bat_priv(struct batadv_priv *bat_priv); +void batadv_nc_init_orig(struct batadv_orig_node *orig_node); +bool batadv_nc_skb_forward(struct sk_buff *skb, + struct batadv_neigh_node *neigh_node); +void batadv_nc_skb_store_for_decoding(struct batadv_priv *bat_priv, + struct sk_buff *skb); +void batadv_nc_skb_store_sniffed_unicast(struct batadv_priv *bat_priv, + struct sk_buff *skb); + +#else /* ifdef CONFIG_BATMAN_ADV_NC */ + +static inline void batadv_nc_status_update(struct net_device *net_dev) +{ +} + +static inline int batadv_nc_init(void) +{ + return 0; +} + +static inline int batadv_nc_mesh_init(struct batadv_priv *bat_priv) +{ + return 0; +} + +static inline void batadv_nc_mesh_free(struct batadv_priv *bat_priv) +{ +} + +static inline void +batadv_nc_update_nc_node(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + struct batadv_orig_node *orig_neigh_node, + struct batadv_ogm_packet *ogm_packet, + int is_single_hop_neigh) +{ +} + +static inline void +batadv_nc_purge_orig(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + bool (*to_purge)(struct batadv_priv *, + struct batadv_nc_node *)) +{ +} + +static inline void batadv_nc_init_bat_priv(struct batadv_priv *bat_priv) +{ +} + +static inline void batadv_nc_init_orig(struct batadv_orig_node *orig_node) +{ +} + +static inline bool batadv_nc_skb_forward(struct sk_buff *skb, + struct batadv_neigh_node *neigh_node) +{ + return false; +} + +static inline void +batadv_nc_skb_store_for_decoding(struct batadv_priv *bat_priv, + struct sk_buff *skb) +{ +} + +static inline void +batadv_nc_skb_store_sniffed_unicast(struct batadv_priv *bat_priv, + struct sk_buff *skb) +{ +} + +#endif /* ifdef CONFIG_BATMAN_ADV_NC */ + +#endif /* _NET_BATMAN_ADV_NETWORK_CODING_H_ */ diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c new file mode 100644 index 000000000..34903df4f --- /dev/null +++ b/net/batman-adv/originator.c @@ -0,0 +1,1349 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + */ + +#include "originator.h" +#include "main.h" + +#include <linux/atomic.h> +#include <linux/container_of.h> +#include <linux/errno.h> +#include <linux/etherdevice.h> +#include <linux/gfp.h> +#include <linux/jiffies.h> +#include <linux/kref.h> +#include <linux/list.h> +#include <linux/lockdep.h> +#include <linux/netdevice.h> +#include <linux/netlink.h> +#include <linux/rculist.h> +#include <linux/rcupdate.h> +#include <linux/skbuff.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/stddef.h> +#include <linux/workqueue.h> +#include <net/sock.h> +#include <uapi/linux/batadv_packet.h> +#include <uapi/linux/batman_adv.h> + +#include "bat_algo.h" +#include "distributed-arp-table.h" +#include "fragmentation.h" +#include "gateway_client.h" +#include "hard-interface.h" +#include "hash.h" +#include "log.h" +#include "multicast.h" +#include "netlink.h" +#include "network-coding.h" +#include "routing.h" +#include "soft-interface.h" +#include "translation-table.h" + +/* hash class keys */ +static struct lock_class_key batadv_orig_hash_lock_class_key; + +/** + * batadv_orig_hash_find() - Find and return originator from orig_hash + * @bat_priv: the bat priv with all the soft interface information + * @data: mac address of the originator + * + * Return: orig_node (with increased refcnt), NULL on errors + */ +struct batadv_orig_node * +batadv_orig_hash_find(struct batadv_priv *bat_priv, const void *data) +{ + struct batadv_hashtable *hash = bat_priv->orig_hash; + struct hlist_head *head; + struct batadv_orig_node *orig_node, *orig_node_tmp = NULL; + int index; + + if (!hash) + return NULL; + + index = batadv_choose_orig(data, hash->size); + head = &hash->table[index]; + + rcu_read_lock(); + hlist_for_each_entry_rcu(orig_node, head, hash_entry) { + if (!batadv_compare_eth(orig_node, data)) + continue; + + if (!kref_get_unless_zero(&orig_node->refcount)) + continue; + + orig_node_tmp = orig_node; + break; + } + rcu_read_unlock(); + + return orig_node_tmp; +} + +static void batadv_purge_orig(struct work_struct *work); + +/** + * batadv_compare_orig() - comparing function used in the originator hash table + * @node: node in the local table + * @data2: second object to compare the node to + * + * Return: true if they are the same originator + */ +bool batadv_compare_orig(const struct hlist_node *node, const void *data2) +{ + const void *data1 = container_of(node, struct batadv_orig_node, + hash_entry); + + return batadv_compare_eth(data1, data2); +} + +/** + * batadv_orig_node_vlan_get() - get an orig_node_vlan object + * @orig_node: the originator serving the VLAN + * @vid: the VLAN identifier + * + * Return: the vlan object identified by vid and belonging to orig_node or NULL + * if it does not exist. + */ +struct batadv_orig_node_vlan * +batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node, + unsigned short vid) +{ + struct batadv_orig_node_vlan *vlan = NULL, *tmp; + + rcu_read_lock(); + hlist_for_each_entry_rcu(tmp, &orig_node->vlan_list, list) { + if (tmp->vid != vid) + continue; + + if (!kref_get_unless_zero(&tmp->refcount)) + continue; + + vlan = tmp; + + break; + } + rcu_read_unlock(); + + return vlan; +} + +/** + * batadv_orig_node_vlan_new() - search and possibly create an orig_node_vlan + * object + * @orig_node: the originator serving the VLAN + * @vid: the VLAN identifier + * + * Return: NULL in case of failure or the vlan object identified by vid and + * belonging to orig_node otherwise. The object is created and added to the list + * if it does not exist. + * + * The object is returned with refcounter increased by 1. + */ +struct batadv_orig_node_vlan * +batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node, + unsigned short vid) +{ + struct batadv_orig_node_vlan *vlan; + + spin_lock_bh(&orig_node->vlan_list_lock); + + /* first look if an object for this vid already exists */ + vlan = batadv_orig_node_vlan_get(orig_node, vid); + if (vlan) + goto out; + + vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC); + if (!vlan) + goto out; + + kref_init(&vlan->refcount); + vlan->vid = vid; + + kref_get(&vlan->refcount); + hlist_add_head_rcu(&vlan->list, &orig_node->vlan_list); + +out: + spin_unlock_bh(&orig_node->vlan_list_lock); + + return vlan; +} + +/** + * batadv_orig_node_vlan_release() - release originator-vlan object from lists + * and queue for free after rcu grace period + * @ref: kref pointer of the originator-vlan object + */ +void batadv_orig_node_vlan_release(struct kref *ref) +{ + struct batadv_orig_node_vlan *orig_vlan; + + orig_vlan = container_of(ref, struct batadv_orig_node_vlan, refcount); + + kfree_rcu(orig_vlan, rcu); +} + +/** + * batadv_originator_init() - Initialize all originator structures + * @bat_priv: the bat priv with all the soft interface information + * + * Return: 0 on success or negative error number in case of failure + */ +int batadv_originator_init(struct batadv_priv *bat_priv) +{ + if (bat_priv->orig_hash) + return 0; + + bat_priv->orig_hash = batadv_hash_new(1024); + + if (!bat_priv->orig_hash) + goto err; + + batadv_hash_set_lock_class(bat_priv->orig_hash, + &batadv_orig_hash_lock_class_key); + + INIT_DELAYED_WORK(&bat_priv->orig_work, batadv_purge_orig); + queue_delayed_work(batadv_event_workqueue, + &bat_priv->orig_work, + msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD)); + + return 0; + +err: + return -ENOMEM; +} + +/** + * batadv_neigh_ifinfo_release() - release neigh_ifinfo from lists and queue for + * free after rcu grace period + * @ref: kref pointer of the neigh_ifinfo + */ +void batadv_neigh_ifinfo_release(struct kref *ref) +{ + struct batadv_neigh_ifinfo *neigh_ifinfo; + + neigh_ifinfo = container_of(ref, struct batadv_neigh_ifinfo, refcount); + + if (neigh_ifinfo->if_outgoing != BATADV_IF_DEFAULT) + batadv_hardif_put(neigh_ifinfo->if_outgoing); + + kfree_rcu(neigh_ifinfo, rcu); +} + +/** + * batadv_hardif_neigh_release() - release hardif neigh node from lists and + * queue for free after rcu grace period + * @ref: kref pointer of the neigh_node + */ +void batadv_hardif_neigh_release(struct kref *ref) +{ + struct batadv_hardif_neigh_node *hardif_neigh; + + hardif_neigh = container_of(ref, struct batadv_hardif_neigh_node, + refcount); + + spin_lock_bh(&hardif_neigh->if_incoming->neigh_list_lock); + hlist_del_init_rcu(&hardif_neigh->list); + spin_unlock_bh(&hardif_neigh->if_incoming->neigh_list_lock); + + batadv_hardif_put(hardif_neigh->if_incoming); + kfree_rcu(hardif_neigh, rcu); +} + +/** + * batadv_neigh_node_release() - release neigh_node from lists and queue for + * free after rcu grace period + * @ref: kref pointer of the neigh_node + */ +void batadv_neigh_node_release(struct kref *ref) +{ + struct hlist_node *node_tmp; + struct batadv_neigh_node *neigh_node; + struct batadv_neigh_ifinfo *neigh_ifinfo; + + neigh_node = container_of(ref, struct batadv_neigh_node, refcount); + + hlist_for_each_entry_safe(neigh_ifinfo, node_tmp, + &neigh_node->ifinfo_list, list) { + batadv_neigh_ifinfo_put(neigh_ifinfo); + } + + batadv_hardif_neigh_put(neigh_node->hardif_neigh); + + batadv_hardif_put(neigh_node->if_incoming); + + kfree_rcu(neigh_node, rcu); +} + +/** + * batadv_orig_router_get() - router to the originator depending on iface + * @orig_node: the orig node for the router + * @if_outgoing: the interface where the payload packet has been received or + * the OGM should be sent to + * + * Return: the neighbor which should be the router for this orig_node/iface. + * + * The object is returned with refcounter increased by 1. + */ +struct batadv_neigh_node * +batadv_orig_router_get(struct batadv_orig_node *orig_node, + const struct batadv_hard_iface *if_outgoing) +{ + struct batadv_orig_ifinfo *orig_ifinfo; + struct batadv_neigh_node *router = NULL; + + rcu_read_lock(); + hlist_for_each_entry_rcu(orig_ifinfo, &orig_node->ifinfo_list, list) { + if (orig_ifinfo->if_outgoing != if_outgoing) + continue; + + router = rcu_dereference(orig_ifinfo->router); + break; + } + + if (router && !kref_get_unless_zero(&router->refcount)) + router = NULL; + + rcu_read_unlock(); + return router; +} + +/** + * batadv_orig_ifinfo_get() - find the ifinfo from an orig_node + * @orig_node: the orig node to be queried + * @if_outgoing: the interface for which the ifinfo should be acquired + * + * Return: the requested orig_ifinfo or NULL if not found. + * + * The object is returned with refcounter increased by 1. + */ +struct batadv_orig_ifinfo * +batadv_orig_ifinfo_get(struct batadv_orig_node *orig_node, + struct batadv_hard_iface *if_outgoing) +{ + struct batadv_orig_ifinfo *tmp, *orig_ifinfo = NULL; + + rcu_read_lock(); + hlist_for_each_entry_rcu(tmp, &orig_node->ifinfo_list, + list) { + if (tmp->if_outgoing != if_outgoing) + continue; + + if (!kref_get_unless_zero(&tmp->refcount)) + continue; + + orig_ifinfo = tmp; + break; + } + rcu_read_unlock(); + + return orig_ifinfo; +} + +/** + * batadv_orig_ifinfo_new() - search and possibly create an orig_ifinfo object + * @orig_node: the orig node to be queried + * @if_outgoing: the interface for which the ifinfo should be acquired + * + * Return: NULL in case of failure or the orig_ifinfo object for the if_outgoing + * interface otherwise. The object is created and added to the list + * if it does not exist. + * + * The object is returned with refcounter increased by 1. + */ +struct batadv_orig_ifinfo * +batadv_orig_ifinfo_new(struct batadv_orig_node *orig_node, + struct batadv_hard_iface *if_outgoing) +{ + struct batadv_orig_ifinfo *orig_ifinfo; + unsigned long reset_time; + + spin_lock_bh(&orig_node->neigh_list_lock); + + orig_ifinfo = batadv_orig_ifinfo_get(orig_node, if_outgoing); + if (orig_ifinfo) + goto out; + + orig_ifinfo = kzalloc(sizeof(*orig_ifinfo), GFP_ATOMIC); + if (!orig_ifinfo) + goto out; + + if (if_outgoing != BATADV_IF_DEFAULT) + kref_get(&if_outgoing->refcount); + + reset_time = jiffies - 1; + reset_time -= msecs_to_jiffies(BATADV_RESET_PROTECTION_MS); + orig_ifinfo->batman_seqno_reset = reset_time; + orig_ifinfo->if_outgoing = if_outgoing; + INIT_HLIST_NODE(&orig_ifinfo->list); + kref_init(&orig_ifinfo->refcount); + + kref_get(&orig_ifinfo->refcount); + hlist_add_head_rcu(&orig_ifinfo->list, + &orig_node->ifinfo_list); +out: + spin_unlock_bh(&orig_node->neigh_list_lock); + return orig_ifinfo; +} + +/** + * batadv_neigh_ifinfo_get() - find the ifinfo from an neigh_node + * @neigh: the neigh node to be queried + * @if_outgoing: the interface for which the ifinfo should be acquired + * + * The object is returned with refcounter increased by 1. + * + * Return: the requested neigh_ifinfo or NULL if not found + */ +struct batadv_neigh_ifinfo * +batadv_neigh_ifinfo_get(struct batadv_neigh_node *neigh, + struct batadv_hard_iface *if_outgoing) +{ + struct batadv_neigh_ifinfo *neigh_ifinfo = NULL, + *tmp_neigh_ifinfo; + + rcu_read_lock(); + hlist_for_each_entry_rcu(tmp_neigh_ifinfo, &neigh->ifinfo_list, + list) { + if (tmp_neigh_ifinfo->if_outgoing != if_outgoing) + continue; + + if (!kref_get_unless_zero(&tmp_neigh_ifinfo->refcount)) + continue; + + neigh_ifinfo = tmp_neigh_ifinfo; + break; + } + rcu_read_unlock(); + + return neigh_ifinfo; +} + +/** + * batadv_neigh_ifinfo_new() - search and possibly create an neigh_ifinfo object + * @neigh: the neigh node to be queried + * @if_outgoing: the interface for which the ifinfo should be acquired + * + * Return: NULL in case of failure or the neigh_ifinfo object for the + * if_outgoing interface otherwise. The object is created and added to the list + * if it does not exist. + * + * The object is returned with refcounter increased by 1. + */ +struct batadv_neigh_ifinfo * +batadv_neigh_ifinfo_new(struct batadv_neigh_node *neigh, + struct batadv_hard_iface *if_outgoing) +{ + struct batadv_neigh_ifinfo *neigh_ifinfo; + + spin_lock_bh(&neigh->ifinfo_lock); + + neigh_ifinfo = batadv_neigh_ifinfo_get(neigh, if_outgoing); + if (neigh_ifinfo) + goto out; + + neigh_ifinfo = kzalloc(sizeof(*neigh_ifinfo), GFP_ATOMIC); + if (!neigh_ifinfo) + goto out; + + if (if_outgoing) + kref_get(&if_outgoing->refcount); + + INIT_HLIST_NODE(&neigh_ifinfo->list); + kref_init(&neigh_ifinfo->refcount); + neigh_ifinfo->if_outgoing = if_outgoing; + + kref_get(&neigh_ifinfo->refcount); + hlist_add_head_rcu(&neigh_ifinfo->list, &neigh->ifinfo_list); + +out: + spin_unlock_bh(&neigh->ifinfo_lock); + + return neigh_ifinfo; +} + +/** + * batadv_neigh_node_get() - retrieve a neighbour from the list + * @orig_node: originator which the neighbour belongs to + * @hard_iface: the interface where this neighbour is connected to + * @addr: the address of the neighbour + * + * Looks for and possibly returns a neighbour belonging to this originator list + * which is connected through the provided hard interface. + * + * Return: neighbor when found. Otherwise NULL + */ +static struct batadv_neigh_node * +batadv_neigh_node_get(const struct batadv_orig_node *orig_node, + const struct batadv_hard_iface *hard_iface, + const u8 *addr) +{ + struct batadv_neigh_node *tmp_neigh_node, *res = NULL; + + rcu_read_lock(); + hlist_for_each_entry_rcu(tmp_neigh_node, &orig_node->neigh_list, list) { + if (!batadv_compare_eth(tmp_neigh_node->addr, addr)) + continue; + + if (tmp_neigh_node->if_incoming != hard_iface) + continue; + + if (!kref_get_unless_zero(&tmp_neigh_node->refcount)) + continue; + + res = tmp_neigh_node; + break; + } + rcu_read_unlock(); + + return res; +} + +/** + * batadv_hardif_neigh_create() - create a hardif neighbour node + * @hard_iface: the interface this neighbour is connected to + * @neigh_addr: the interface address of the neighbour to retrieve + * @orig_node: originator object representing the neighbour + * + * Return: the hardif neighbour node if found or created or NULL otherwise. + */ +static struct batadv_hardif_neigh_node * +batadv_hardif_neigh_create(struct batadv_hard_iface *hard_iface, + const u8 *neigh_addr, + struct batadv_orig_node *orig_node) +{ + struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); + struct batadv_hardif_neigh_node *hardif_neigh; + + spin_lock_bh(&hard_iface->neigh_list_lock); + + /* check if neighbor hasn't been added in the meantime */ + hardif_neigh = batadv_hardif_neigh_get(hard_iface, neigh_addr); + if (hardif_neigh) + goto out; + + hardif_neigh = kzalloc(sizeof(*hardif_neigh), GFP_ATOMIC); + if (!hardif_neigh) + goto out; + + kref_get(&hard_iface->refcount); + INIT_HLIST_NODE(&hardif_neigh->list); + ether_addr_copy(hardif_neigh->addr, neigh_addr); + ether_addr_copy(hardif_neigh->orig, orig_node->orig); + hardif_neigh->if_incoming = hard_iface; + hardif_neigh->last_seen = jiffies; + + kref_init(&hardif_neigh->refcount); + + if (bat_priv->algo_ops->neigh.hardif_init) + bat_priv->algo_ops->neigh.hardif_init(hardif_neigh); + + hlist_add_head_rcu(&hardif_neigh->list, &hard_iface->neigh_list); + +out: + spin_unlock_bh(&hard_iface->neigh_list_lock); + return hardif_neigh; +} + +/** + * batadv_hardif_neigh_get_or_create() - retrieve or create a hardif neighbour + * node + * @hard_iface: the interface this neighbour is connected to + * @neigh_addr: the interface address of the neighbour to retrieve + * @orig_node: originator object representing the neighbour + * + * Return: the hardif neighbour node if found or created or NULL otherwise. + */ +static struct batadv_hardif_neigh_node * +batadv_hardif_neigh_get_or_create(struct batadv_hard_iface *hard_iface, + const u8 *neigh_addr, + struct batadv_orig_node *orig_node) +{ + struct batadv_hardif_neigh_node *hardif_neigh; + + /* first check without locking to avoid the overhead */ + hardif_neigh = batadv_hardif_neigh_get(hard_iface, neigh_addr); + if (hardif_neigh) + return hardif_neigh; + + return batadv_hardif_neigh_create(hard_iface, neigh_addr, orig_node); +} + +/** + * batadv_hardif_neigh_get() - retrieve a hardif neighbour from the list + * @hard_iface: the interface where this neighbour is connected to + * @neigh_addr: the address of the neighbour + * + * Looks for and possibly returns a neighbour belonging to this hard interface. + * + * Return: neighbor when found. Otherwise NULL + */ +struct batadv_hardif_neigh_node * +batadv_hardif_neigh_get(const struct batadv_hard_iface *hard_iface, + const u8 *neigh_addr) +{ + struct batadv_hardif_neigh_node *tmp_hardif_neigh, *hardif_neigh = NULL; + + rcu_read_lock(); + hlist_for_each_entry_rcu(tmp_hardif_neigh, + &hard_iface->neigh_list, list) { + if (!batadv_compare_eth(tmp_hardif_neigh->addr, neigh_addr)) + continue; + + if (!kref_get_unless_zero(&tmp_hardif_neigh->refcount)) + continue; + + hardif_neigh = tmp_hardif_neigh; + break; + } + rcu_read_unlock(); + + return hardif_neigh; +} + +/** + * batadv_neigh_node_create() - create a neigh node object + * @orig_node: originator object representing the neighbour + * @hard_iface: the interface where the neighbour is connected to + * @neigh_addr: the mac address of the neighbour interface + * + * Allocates a new neigh_node object and initialises all the generic fields. + * + * Return: the neighbour node if found or created or NULL otherwise. + */ +static struct batadv_neigh_node * +batadv_neigh_node_create(struct batadv_orig_node *orig_node, + struct batadv_hard_iface *hard_iface, + const u8 *neigh_addr) +{ + struct batadv_neigh_node *neigh_node; + struct batadv_hardif_neigh_node *hardif_neigh = NULL; + + spin_lock_bh(&orig_node->neigh_list_lock); + + neigh_node = batadv_neigh_node_get(orig_node, hard_iface, neigh_addr); + if (neigh_node) + goto out; + + hardif_neigh = batadv_hardif_neigh_get_or_create(hard_iface, + neigh_addr, orig_node); + if (!hardif_neigh) + goto out; + + neigh_node = kzalloc(sizeof(*neigh_node), GFP_ATOMIC); + if (!neigh_node) + goto out; + + INIT_HLIST_NODE(&neigh_node->list); + INIT_HLIST_HEAD(&neigh_node->ifinfo_list); + spin_lock_init(&neigh_node->ifinfo_lock); + + kref_get(&hard_iface->refcount); + ether_addr_copy(neigh_node->addr, neigh_addr); + neigh_node->if_incoming = hard_iface; + neigh_node->orig_node = orig_node; + neigh_node->last_seen = jiffies; + + /* increment unique neighbor refcount */ + kref_get(&hardif_neigh->refcount); + neigh_node->hardif_neigh = hardif_neigh; + + /* extra reference for return */ + kref_init(&neigh_node->refcount); + + kref_get(&neigh_node->refcount); + hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list); + + batadv_dbg(BATADV_DBG_BATMAN, orig_node->bat_priv, + "Creating new neighbor %pM for orig_node %pM on interface %s\n", + neigh_addr, orig_node->orig, hard_iface->net_dev->name); + +out: + spin_unlock_bh(&orig_node->neigh_list_lock); + + batadv_hardif_neigh_put(hardif_neigh); + return neigh_node; +} + +/** + * batadv_neigh_node_get_or_create() - retrieve or create a neigh node object + * @orig_node: originator object representing the neighbour + * @hard_iface: the interface where the neighbour is connected to + * @neigh_addr: the mac address of the neighbour interface + * + * Return: the neighbour node if found or created or NULL otherwise. + */ +struct batadv_neigh_node * +batadv_neigh_node_get_or_create(struct batadv_orig_node *orig_node, + struct batadv_hard_iface *hard_iface, + const u8 *neigh_addr) +{ + struct batadv_neigh_node *neigh_node; + + /* first check without locking to avoid the overhead */ + neigh_node = batadv_neigh_node_get(orig_node, hard_iface, neigh_addr); + if (neigh_node) + return neigh_node; + + return batadv_neigh_node_create(orig_node, hard_iface, neigh_addr); +} + +/** + * batadv_hardif_neigh_dump() - Dump to netlink the neighbor infos for a + * specific outgoing interface + * @msg: message to dump into + * @cb: parameters for the dump + * + * Return: 0 or error value + */ +int batadv_hardif_neigh_dump(struct sk_buff *msg, struct netlink_callback *cb) +{ + struct net *net = sock_net(cb->skb->sk); + struct net_device *soft_iface; + struct net_device *hard_iface = NULL; + struct batadv_hard_iface *hardif = BATADV_IF_DEFAULT; + struct batadv_priv *bat_priv; + struct batadv_hard_iface *primary_if = NULL; + int ret; + int ifindex, hard_ifindex; + + ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX); + if (!ifindex) + return -EINVAL; + + soft_iface = dev_get_by_index(net, ifindex); + if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { + ret = -ENODEV; + goto out; + } + + bat_priv = netdev_priv(soft_iface); + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { + ret = -ENOENT; + goto out; + } + + hard_ifindex = batadv_netlink_get_ifindex(cb->nlh, + BATADV_ATTR_HARD_IFINDEX); + if (hard_ifindex) { + hard_iface = dev_get_by_index(net, hard_ifindex); + if (hard_iface) + hardif = batadv_hardif_get_by_netdev(hard_iface); + + if (!hardif) { + ret = -ENODEV; + goto out; + } + + if (hardif->soft_iface != soft_iface) { + ret = -ENOENT; + goto out; + } + } + + if (!bat_priv->algo_ops->neigh.dump) { + ret = -EOPNOTSUPP; + goto out; + } + + bat_priv->algo_ops->neigh.dump(msg, cb, bat_priv, hardif); + + ret = msg->len; + + out: + batadv_hardif_put(hardif); + dev_put(hard_iface); + batadv_hardif_put(primary_if); + dev_put(soft_iface); + + return ret; +} + +/** + * batadv_orig_ifinfo_release() - release orig_ifinfo from lists and queue for + * free after rcu grace period + * @ref: kref pointer of the orig_ifinfo + */ +void batadv_orig_ifinfo_release(struct kref *ref) +{ + struct batadv_orig_ifinfo *orig_ifinfo; + struct batadv_neigh_node *router; + + orig_ifinfo = container_of(ref, struct batadv_orig_ifinfo, refcount); + + if (orig_ifinfo->if_outgoing != BATADV_IF_DEFAULT) + batadv_hardif_put(orig_ifinfo->if_outgoing); + + /* this is the last reference to this object */ + router = rcu_dereference_protected(orig_ifinfo->router, true); + batadv_neigh_node_put(router); + + kfree_rcu(orig_ifinfo, rcu); +} + +/** + * batadv_orig_node_free_rcu() - free the orig_node + * @rcu: rcu pointer of the orig_node + */ +static void batadv_orig_node_free_rcu(struct rcu_head *rcu) +{ + struct batadv_orig_node *orig_node; + + orig_node = container_of(rcu, struct batadv_orig_node, rcu); + + batadv_mcast_purge_orig(orig_node); + + batadv_frag_purge_orig(orig_node, NULL); + + kfree(orig_node->tt_buff); + kfree(orig_node); +} + +/** + * batadv_orig_node_release() - release orig_node from lists and queue for + * free after rcu grace period + * @ref: kref pointer of the orig_node + */ +void batadv_orig_node_release(struct kref *ref) +{ + struct hlist_node *node_tmp; + struct batadv_neigh_node *neigh_node; + struct batadv_orig_node *orig_node; + struct batadv_orig_ifinfo *orig_ifinfo; + struct batadv_orig_node_vlan *vlan; + struct batadv_orig_ifinfo *last_candidate; + + orig_node = container_of(ref, struct batadv_orig_node, refcount); + + spin_lock_bh(&orig_node->neigh_list_lock); + + /* for all neighbors towards this originator ... */ + hlist_for_each_entry_safe(neigh_node, node_tmp, + &orig_node->neigh_list, list) { + hlist_del_rcu(&neigh_node->list); + batadv_neigh_node_put(neigh_node); + } + + hlist_for_each_entry_safe(orig_ifinfo, node_tmp, + &orig_node->ifinfo_list, list) { + hlist_del_rcu(&orig_ifinfo->list); + batadv_orig_ifinfo_put(orig_ifinfo); + } + + last_candidate = orig_node->last_bonding_candidate; + orig_node->last_bonding_candidate = NULL; + spin_unlock_bh(&orig_node->neigh_list_lock); + + batadv_orig_ifinfo_put(last_candidate); + + spin_lock_bh(&orig_node->vlan_list_lock); + hlist_for_each_entry_safe(vlan, node_tmp, &orig_node->vlan_list, list) { + hlist_del_rcu(&vlan->list); + batadv_orig_node_vlan_put(vlan); + } + spin_unlock_bh(&orig_node->vlan_list_lock); + + /* Free nc_nodes */ + batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL); + + call_rcu(&orig_node->rcu, batadv_orig_node_free_rcu); +} + +/** + * batadv_originator_free() - Free all originator structures + * @bat_priv: the bat priv with all the soft interface information + */ +void batadv_originator_free(struct batadv_priv *bat_priv) +{ + struct batadv_hashtable *hash = bat_priv->orig_hash; + struct hlist_node *node_tmp; + struct hlist_head *head; + spinlock_t *list_lock; /* spinlock to protect write access */ + struct batadv_orig_node *orig_node; + u32 i; + + if (!hash) + return; + + cancel_delayed_work_sync(&bat_priv->orig_work); + + bat_priv->orig_hash = NULL; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + list_lock = &hash->list_locks[i]; + + spin_lock_bh(list_lock); + hlist_for_each_entry_safe(orig_node, node_tmp, + head, hash_entry) { + hlist_del_rcu(&orig_node->hash_entry); + batadv_orig_node_put(orig_node); + } + spin_unlock_bh(list_lock); + } + + batadv_hash_destroy(hash); +} + +/** + * batadv_orig_node_new() - creates a new orig_node + * @bat_priv: the bat priv with all the soft interface information + * @addr: the mac address of the originator + * + * Creates a new originator object and initialises all the generic fields. + * The new object is not added to the originator list. + * + * Return: the newly created object or NULL on failure. + */ +struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv, + const u8 *addr) +{ + struct batadv_orig_node *orig_node; + struct batadv_orig_node_vlan *vlan; + unsigned long reset_time; + int i; + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Creating new originator: %pM\n", addr); + + orig_node = kzalloc(sizeof(*orig_node), GFP_ATOMIC); + if (!orig_node) + return NULL; + + INIT_HLIST_HEAD(&orig_node->neigh_list); + INIT_HLIST_HEAD(&orig_node->vlan_list); + INIT_HLIST_HEAD(&orig_node->ifinfo_list); + spin_lock_init(&orig_node->bcast_seqno_lock); + spin_lock_init(&orig_node->neigh_list_lock); + spin_lock_init(&orig_node->tt_buff_lock); + spin_lock_init(&orig_node->tt_lock); + spin_lock_init(&orig_node->vlan_list_lock); + + batadv_nc_init_orig(orig_node); + + /* extra reference for return */ + kref_init(&orig_node->refcount); + + orig_node->bat_priv = bat_priv; + ether_addr_copy(orig_node->orig, addr); + batadv_dat_init_orig_node_addr(orig_node); + atomic_set(&orig_node->last_ttvn, 0); + orig_node->tt_buff = NULL; + orig_node->tt_buff_len = 0; + orig_node->last_seen = jiffies; + reset_time = jiffies - 1 - msecs_to_jiffies(BATADV_RESET_PROTECTION_MS); + orig_node->bcast_seqno_reset = reset_time; + +#ifdef CONFIG_BATMAN_ADV_MCAST + orig_node->mcast_flags = BATADV_MCAST_WANT_NO_RTR4; + orig_node->mcast_flags |= BATADV_MCAST_WANT_NO_RTR6; + INIT_HLIST_NODE(&orig_node->mcast_want_all_unsnoopables_node); + INIT_HLIST_NODE(&orig_node->mcast_want_all_ipv4_node); + INIT_HLIST_NODE(&orig_node->mcast_want_all_ipv6_node); + spin_lock_init(&orig_node->mcast_handler_lock); +#endif + + /* create a vlan object for the "untagged" LAN */ + vlan = batadv_orig_node_vlan_new(orig_node, BATADV_NO_FLAGS); + if (!vlan) + goto free_orig_node; + /* batadv_orig_node_vlan_new() increases the refcounter. + * Immediately release vlan since it is not needed anymore in this + * context + */ + batadv_orig_node_vlan_put(vlan); + + for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) { + INIT_HLIST_HEAD(&orig_node->fragments[i].fragment_list); + spin_lock_init(&orig_node->fragments[i].lock); + orig_node->fragments[i].size = 0; + } + + return orig_node; +free_orig_node: + kfree(orig_node); + return NULL; +} + +/** + * batadv_purge_neigh_ifinfo() - purge obsolete ifinfo entries from neighbor + * @bat_priv: the bat priv with all the soft interface information + * @neigh: orig node which is to be checked + */ +static void +batadv_purge_neigh_ifinfo(struct batadv_priv *bat_priv, + struct batadv_neigh_node *neigh) +{ + struct batadv_neigh_ifinfo *neigh_ifinfo; + struct batadv_hard_iface *if_outgoing; + struct hlist_node *node_tmp; + + spin_lock_bh(&neigh->ifinfo_lock); + + /* for all ifinfo objects for this neighinator */ + hlist_for_each_entry_safe(neigh_ifinfo, node_tmp, + &neigh->ifinfo_list, list) { + if_outgoing = neigh_ifinfo->if_outgoing; + + /* always keep the default interface */ + if (if_outgoing == BATADV_IF_DEFAULT) + continue; + + /* don't purge if the interface is not (going) down */ + if (if_outgoing->if_status != BATADV_IF_INACTIVE && + if_outgoing->if_status != BATADV_IF_NOT_IN_USE && + if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED) + continue; + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "neighbor/ifinfo purge: neighbor %pM, iface: %s\n", + neigh->addr, if_outgoing->net_dev->name); + + hlist_del_rcu(&neigh_ifinfo->list); + batadv_neigh_ifinfo_put(neigh_ifinfo); + } + + spin_unlock_bh(&neigh->ifinfo_lock); +} + +/** + * batadv_purge_orig_ifinfo() - purge obsolete ifinfo entries from originator + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: orig node which is to be checked + * + * Return: true if any ifinfo entry was purged, false otherwise. + */ +static bool +batadv_purge_orig_ifinfo(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node) +{ + struct batadv_orig_ifinfo *orig_ifinfo; + struct batadv_hard_iface *if_outgoing; + struct hlist_node *node_tmp; + bool ifinfo_purged = false; + + spin_lock_bh(&orig_node->neigh_list_lock); + + /* for all ifinfo objects for this originator */ + hlist_for_each_entry_safe(orig_ifinfo, node_tmp, + &orig_node->ifinfo_list, list) { + if_outgoing = orig_ifinfo->if_outgoing; + + /* always keep the default interface */ + if (if_outgoing == BATADV_IF_DEFAULT) + continue; + + /* don't purge if the interface is not (going) down */ + if (if_outgoing->if_status != BATADV_IF_INACTIVE && + if_outgoing->if_status != BATADV_IF_NOT_IN_USE && + if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED) + continue; + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "router/ifinfo purge: originator %pM, iface: %s\n", + orig_node->orig, if_outgoing->net_dev->name); + + ifinfo_purged = true; + + hlist_del_rcu(&orig_ifinfo->list); + batadv_orig_ifinfo_put(orig_ifinfo); + if (orig_node->last_bonding_candidate == orig_ifinfo) { + orig_node->last_bonding_candidate = NULL; + batadv_orig_ifinfo_put(orig_ifinfo); + } + } + + spin_unlock_bh(&orig_node->neigh_list_lock); + + return ifinfo_purged; +} + +/** + * batadv_purge_orig_neighbors() - purges neighbors from originator + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: orig node which is to be checked + * + * Return: true if any neighbor was purged, false otherwise + */ +static bool +batadv_purge_orig_neighbors(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node) +{ + struct hlist_node *node_tmp; + struct batadv_neigh_node *neigh_node; + bool neigh_purged = false; + unsigned long last_seen; + struct batadv_hard_iface *if_incoming; + + spin_lock_bh(&orig_node->neigh_list_lock); + + /* for all neighbors towards this originator ... */ + hlist_for_each_entry_safe(neigh_node, node_tmp, + &orig_node->neigh_list, list) { + last_seen = neigh_node->last_seen; + if_incoming = neigh_node->if_incoming; + + if (batadv_has_timed_out(last_seen, BATADV_PURGE_TIMEOUT) || + if_incoming->if_status == BATADV_IF_INACTIVE || + if_incoming->if_status == BATADV_IF_NOT_IN_USE || + if_incoming->if_status == BATADV_IF_TO_BE_REMOVED) { + if (if_incoming->if_status == BATADV_IF_INACTIVE || + if_incoming->if_status == BATADV_IF_NOT_IN_USE || + if_incoming->if_status == BATADV_IF_TO_BE_REMOVED) + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "neighbor purge: originator %pM, neighbor: %pM, iface: %s\n", + orig_node->orig, neigh_node->addr, + if_incoming->net_dev->name); + else + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "neighbor timeout: originator %pM, neighbor: %pM, last_seen: %u\n", + orig_node->orig, neigh_node->addr, + jiffies_to_msecs(last_seen)); + + neigh_purged = true; + + hlist_del_rcu(&neigh_node->list); + batadv_neigh_node_put(neigh_node); + } else { + /* only necessary if not the whole neighbor is to be + * deleted, but some interface has been removed. + */ + batadv_purge_neigh_ifinfo(bat_priv, neigh_node); + } + } + + spin_unlock_bh(&orig_node->neigh_list_lock); + return neigh_purged; +} + +/** + * batadv_find_best_neighbor() - finds the best neighbor after purging + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: orig node which is to be checked + * @if_outgoing: the interface for which the metric should be compared + * + * Return: the current best neighbor, with refcount increased. + */ +static struct batadv_neigh_node * +batadv_find_best_neighbor(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + struct batadv_hard_iface *if_outgoing) +{ + struct batadv_neigh_node *best = NULL, *neigh; + struct batadv_algo_ops *bao = bat_priv->algo_ops; + + rcu_read_lock(); + hlist_for_each_entry_rcu(neigh, &orig_node->neigh_list, list) { + if (best && (bao->neigh.cmp(neigh, if_outgoing, best, + if_outgoing) <= 0)) + continue; + + if (!kref_get_unless_zero(&neigh->refcount)) + continue; + + batadv_neigh_node_put(best); + + best = neigh; + } + rcu_read_unlock(); + + return best; +} + +/** + * batadv_purge_orig_node() - purges obsolete information from an orig_node + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: orig node which is to be checked + * + * This function checks if the orig_node or substructures of it have become + * obsolete, and purges this information if that's the case. + * + * Return: true if the orig_node is to be removed, false otherwise. + */ +static bool batadv_purge_orig_node(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node) +{ + struct batadv_neigh_node *best_neigh_node; + struct batadv_hard_iface *hard_iface; + bool changed_ifinfo, changed_neigh; + + if (batadv_has_timed_out(orig_node->last_seen, + 2 * BATADV_PURGE_TIMEOUT)) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Originator timeout: originator %pM, last_seen %u\n", + orig_node->orig, + jiffies_to_msecs(orig_node->last_seen)); + return true; + } + changed_ifinfo = batadv_purge_orig_ifinfo(bat_priv, orig_node); + changed_neigh = batadv_purge_orig_neighbors(bat_priv, orig_node); + + if (!changed_ifinfo && !changed_neigh) + return false; + + /* first for NULL ... */ + best_neigh_node = batadv_find_best_neighbor(bat_priv, orig_node, + BATADV_IF_DEFAULT); + batadv_update_route(bat_priv, orig_node, BATADV_IF_DEFAULT, + best_neigh_node); + batadv_neigh_node_put(best_neigh_node); + + /* ... then for all other interfaces. */ + rcu_read_lock(); + list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { + if (hard_iface->if_status != BATADV_IF_ACTIVE) + continue; + + if (hard_iface->soft_iface != bat_priv->soft_iface) + continue; + + if (!kref_get_unless_zero(&hard_iface->refcount)) + continue; + + best_neigh_node = batadv_find_best_neighbor(bat_priv, + orig_node, + hard_iface); + batadv_update_route(bat_priv, orig_node, hard_iface, + best_neigh_node); + batadv_neigh_node_put(best_neigh_node); + + batadv_hardif_put(hard_iface); + } + rcu_read_unlock(); + + return false; +} + +/** + * batadv_purge_orig_ref() - Purge all outdated originators + * @bat_priv: the bat priv with all the soft interface information + */ +void batadv_purge_orig_ref(struct batadv_priv *bat_priv) +{ + struct batadv_hashtable *hash = bat_priv->orig_hash; + struct hlist_node *node_tmp; + struct hlist_head *head; + spinlock_t *list_lock; /* spinlock to protect write access */ + struct batadv_orig_node *orig_node; + u32 i; + + if (!hash) + return; + + /* for all origins... */ + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + list_lock = &hash->list_locks[i]; + + spin_lock_bh(list_lock); + hlist_for_each_entry_safe(orig_node, node_tmp, + head, hash_entry) { + if (batadv_purge_orig_node(bat_priv, orig_node)) { + batadv_gw_node_delete(bat_priv, orig_node); + hlist_del_rcu(&orig_node->hash_entry); + batadv_tt_global_del_orig(orig_node->bat_priv, + orig_node, -1, + "originator timed out"); + batadv_orig_node_put(orig_node); + continue; + } + + batadv_frag_purge_orig(orig_node, + batadv_frag_check_entry); + } + spin_unlock_bh(list_lock); + } + + batadv_gw_election(bat_priv); +} + +static void batadv_purge_orig(struct work_struct *work) +{ + struct delayed_work *delayed_work; + struct batadv_priv *bat_priv; + + delayed_work = to_delayed_work(work); + bat_priv = container_of(delayed_work, struct batadv_priv, orig_work); + batadv_purge_orig_ref(bat_priv); + queue_delayed_work(batadv_event_workqueue, + &bat_priv->orig_work, + msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD)); +} + +/** + * batadv_orig_dump() - Dump to netlink the originator infos for a specific + * outgoing interface + * @msg: message to dump into + * @cb: parameters for the dump + * + * Return: 0 or error value + */ +int batadv_orig_dump(struct sk_buff *msg, struct netlink_callback *cb) +{ + struct net *net = sock_net(cb->skb->sk); + struct net_device *soft_iface; + struct net_device *hard_iface = NULL; + struct batadv_hard_iface *hardif = BATADV_IF_DEFAULT; + struct batadv_priv *bat_priv; + struct batadv_hard_iface *primary_if = NULL; + int ret; + int ifindex, hard_ifindex; + + ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX); + if (!ifindex) + return -EINVAL; + + soft_iface = dev_get_by_index(net, ifindex); + if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { + ret = -ENODEV; + goto out; + } + + bat_priv = netdev_priv(soft_iface); + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { + ret = -ENOENT; + goto out; + } + + hard_ifindex = batadv_netlink_get_ifindex(cb->nlh, + BATADV_ATTR_HARD_IFINDEX); + if (hard_ifindex) { + hard_iface = dev_get_by_index(net, hard_ifindex); + if (hard_iface) + hardif = batadv_hardif_get_by_netdev(hard_iface); + + if (!hardif) { + ret = -ENODEV; + goto out; + } + + if (hardif->soft_iface != soft_iface) { + ret = -ENOENT; + goto out; + } + } + + if (!bat_priv->algo_ops->orig.dump) { + ret = -EOPNOTSUPP; + goto out; + } + + bat_priv->algo_ops->orig.dump(msg, cb, bat_priv, hardif); + + ret = msg->len; + + out: + batadv_hardif_put(hardif); + dev_put(hard_iface); + batadv_hardif_put(primary_if); + dev_put(soft_iface); + + return ret; +} diff --git a/net/batman-adv/originator.h b/net/batman-adv/originator.h new file mode 100644 index 000000000..ea3d69e4e --- /dev/null +++ b/net/batman-adv/originator.h @@ -0,0 +1,167 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + */ + +#ifndef _NET_BATMAN_ADV_ORIGINATOR_H_ +#define _NET_BATMAN_ADV_ORIGINATOR_H_ + +#include "main.h" + +#include <linux/compiler.h> +#include <linux/if_ether.h> +#include <linux/jhash.h> +#include <linux/kref.h> +#include <linux/netlink.h> +#include <linux/skbuff.h> +#include <linux/types.h> + +bool batadv_compare_orig(const struct hlist_node *node, const void *data2); +int batadv_originator_init(struct batadv_priv *bat_priv); +void batadv_originator_free(struct batadv_priv *bat_priv); +void batadv_purge_orig_ref(struct batadv_priv *bat_priv); +void batadv_orig_node_release(struct kref *ref); +struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv, + const u8 *addr); +struct batadv_hardif_neigh_node * +batadv_hardif_neigh_get(const struct batadv_hard_iface *hard_iface, + const u8 *neigh_addr); +void batadv_hardif_neigh_release(struct kref *ref); +struct batadv_neigh_node * +batadv_neigh_node_get_or_create(struct batadv_orig_node *orig_node, + struct batadv_hard_iface *hard_iface, + const u8 *neigh_addr); +void batadv_neigh_node_release(struct kref *ref); +struct batadv_neigh_node * +batadv_orig_router_get(struct batadv_orig_node *orig_node, + const struct batadv_hard_iface *if_outgoing); +struct batadv_neigh_ifinfo * +batadv_neigh_ifinfo_new(struct batadv_neigh_node *neigh, + struct batadv_hard_iface *if_outgoing); +struct batadv_neigh_ifinfo * +batadv_neigh_ifinfo_get(struct batadv_neigh_node *neigh, + struct batadv_hard_iface *if_outgoing); +void batadv_neigh_ifinfo_release(struct kref *ref); + +int batadv_hardif_neigh_dump(struct sk_buff *msg, struct netlink_callback *cb); + +struct batadv_orig_ifinfo * +batadv_orig_ifinfo_get(struct batadv_orig_node *orig_node, + struct batadv_hard_iface *if_outgoing); +struct batadv_orig_ifinfo * +batadv_orig_ifinfo_new(struct batadv_orig_node *orig_node, + struct batadv_hard_iface *if_outgoing); +void batadv_orig_ifinfo_release(struct kref *ref); + +int batadv_orig_dump(struct sk_buff *msg, struct netlink_callback *cb); +struct batadv_orig_node_vlan * +batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node, + unsigned short vid); +struct batadv_orig_node_vlan * +batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node, + unsigned short vid); +void batadv_orig_node_vlan_release(struct kref *ref); + +/** + * batadv_choose_orig() - Return the index of the orig entry in the hash table + * @data: mac address of the originator node + * @size: the size of the hash table + * + * Return: the hash index where the object represented by @data should be + * stored at. + */ +static inline u32 batadv_choose_orig(const void *data, u32 size) +{ + u32 hash = 0; + + hash = jhash(data, ETH_ALEN, hash); + return hash % size; +} + +struct batadv_orig_node * +batadv_orig_hash_find(struct batadv_priv *bat_priv, const void *data); + +/** + * batadv_orig_node_vlan_put() - decrement the refcounter and possibly release + * the originator-vlan object + * @orig_vlan: the originator-vlan object to release + */ +static inline void +batadv_orig_node_vlan_put(struct batadv_orig_node_vlan *orig_vlan) +{ + if (!orig_vlan) + return; + + kref_put(&orig_vlan->refcount, batadv_orig_node_vlan_release); +} + +/** + * batadv_neigh_ifinfo_put() - decrement the refcounter and possibly release + * the neigh_ifinfo + * @neigh_ifinfo: the neigh_ifinfo object to release + */ +static inline void +batadv_neigh_ifinfo_put(struct batadv_neigh_ifinfo *neigh_ifinfo) +{ + if (!neigh_ifinfo) + return; + + kref_put(&neigh_ifinfo->refcount, batadv_neigh_ifinfo_release); +} + +/** + * batadv_hardif_neigh_put() - decrement the hardif neighbors refcounter + * and possibly release it + * @hardif_neigh: hardif neigh neighbor to free + */ +static inline void +batadv_hardif_neigh_put(struct batadv_hardif_neigh_node *hardif_neigh) +{ + if (!hardif_neigh) + return; + + kref_put(&hardif_neigh->refcount, batadv_hardif_neigh_release); +} + +/** + * batadv_neigh_node_put() - decrement the neighbors refcounter and possibly + * release it + * @neigh_node: neigh neighbor to free + */ +static inline void batadv_neigh_node_put(struct batadv_neigh_node *neigh_node) +{ + if (!neigh_node) + return; + + kref_put(&neigh_node->refcount, batadv_neigh_node_release); +} + +/** + * batadv_orig_ifinfo_put() - decrement the refcounter and possibly release + * the orig_ifinfo + * @orig_ifinfo: the orig_ifinfo object to release + */ +static inline void +batadv_orig_ifinfo_put(struct batadv_orig_ifinfo *orig_ifinfo) +{ + if (!orig_ifinfo) + return; + + kref_put(&orig_ifinfo->refcount, batadv_orig_ifinfo_release); +} + +/** + * batadv_orig_node_put() - decrement the orig node refcounter and possibly + * release it + * @orig_node: the orig node to free + */ +static inline void batadv_orig_node_put(struct batadv_orig_node *orig_node) +{ + if (!orig_node) + return; + + kref_put(&orig_node->refcount, batadv_orig_node_release); +} + +#endif /* _NET_BATMAN_ADV_ORIGINATOR_H_ */ diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c new file mode 100644 index 000000000..83f31494e --- /dev/null +++ b/net/batman-adv/routing.c @@ -0,0 +1,1273 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + */ + +#include "routing.h" +#include "main.h" + +#include <linux/atomic.h> +#include <linux/byteorder/generic.h> +#include <linux/compiler.h> +#include <linux/errno.h> +#include <linux/etherdevice.h> +#include <linux/if_ether.h> +#include <linux/jiffies.h> +#include <linux/kref.h> +#include <linux/netdevice.h> +#include <linux/printk.h> +#include <linux/rculist.h> +#include <linux/rcupdate.h> +#include <linux/skbuff.h> +#include <linux/spinlock.h> +#include <linux/stddef.h> +#include <uapi/linux/batadv_packet.h> + +#include "bitarray.h" +#include "bridge_loop_avoidance.h" +#include "distributed-arp-table.h" +#include "fragmentation.h" +#include "hard-interface.h" +#include "log.h" +#include "network-coding.h" +#include "originator.h" +#include "send.h" +#include "soft-interface.h" +#include "tp_meter.h" +#include "translation-table.h" +#include "tvlv.h" + +static int batadv_route_unicast_packet(struct sk_buff *skb, + struct batadv_hard_iface *recv_if); + +/** + * _batadv_update_route() - set the router for this originator + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: orig node which is to be configured + * @recv_if: the receive interface for which this route is set + * @neigh_node: neighbor which should be the next router + * + * This function does not perform any error checks + */ +static void _batadv_update_route(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + struct batadv_hard_iface *recv_if, + struct batadv_neigh_node *neigh_node) +{ + struct batadv_orig_ifinfo *orig_ifinfo; + struct batadv_neigh_node *curr_router; + + orig_ifinfo = batadv_orig_ifinfo_get(orig_node, recv_if); + if (!orig_ifinfo) + return; + + spin_lock_bh(&orig_node->neigh_list_lock); + /* curr_router used earlier may not be the current orig_ifinfo->router + * anymore because it was dereferenced outside of the neigh_list_lock + * protected region. After the new best neighbor has replace the current + * best neighbor the reference counter needs to decrease. Consequently, + * the code needs to ensure the curr_router variable contains a pointer + * to the replaced best neighbor. + */ + + /* increase refcount of new best neighbor */ + if (neigh_node) + kref_get(&neigh_node->refcount); + + curr_router = rcu_replace_pointer(orig_ifinfo->router, neigh_node, + true); + spin_unlock_bh(&orig_node->neigh_list_lock); + batadv_orig_ifinfo_put(orig_ifinfo); + + /* route deleted */ + if (curr_router && !neigh_node) { + batadv_dbg(BATADV_DBG_ROUTES, bat_priv, + "Deleting route towards: %pM\n", orig_node->orig); + batadv_tt_global_del_orig(bat_priv, orig_node, -1, + "Deleted route towards originator"); + + /* route added */ + } else if (!curr_router && neigh_node) { + batadv_dbg(BATADV_DBG_ROUTES, bat_priv, + "Adding route towards: %pM (via %pM)\n", + orig_node->orig, neigh_node->addr); + /* route changed */ + } else if (neigh_node && curr_router) { + batadv_dbg(BATADV_DBG_ROUTES, bat_priv, + "Changing route towards: %pM (now via %pM - was via %pM)\n", + orig_node->orig, neigh_node->addr, + curr_router->addr); + } + + /* decrease refcount of previous best neighbor */ + batadv_neigh_node_put(curr_router); +} + +/** + * batadv_update_route() - set the router for this originator + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: orig node which is to be configured + * @recv_if: the receive interface for which this route is set + * @neigh_node: neighbor which should be the next router + */ +void batadv_update_route(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + struct batadv_hard_iface *recv_if, + struct batadv_neigh_node *neigh_node) +{ + struct batadv_neigh_node *router = NULL; + + if (!orig_node) + goto out; + + router = batadv_orig_router_get(orig_node, recv_if); + + if (router != neigh_node) + _batadv_update_route(bat_priv, orig_node, recv_if, neigh_node); + +out: + batadv_neigh_node_put(router); +} + +/** + * batadv_window_protected() - checks whether the host restarted and is in the + * protection time. + * @bat_priv: the bat priv with all the soft interface information + * @seq_num_diff: difference between the current/received sequence number and + * the last sequence number + * @seq_old_max_diff: maximum age of sequence number not considered as restart + * @last_reset: jiffies timestamp of the last reset, will be updated when reset + * is detected + * @protection_started: is set to true if the protection window was started, + * doesn't change otherwise. + * + * Return: + * false if the packet is to be accepted. + * true if the packet is to be ignored. + */ +bool batadv_window_protected(struct batadv_priv *bat_priv, s32 seq_num_diff, + s32 seq_old_max_diff, unsigned long *last_reset, + bool *protection_started) +{ + if (seq_num_diff <= -seq_old_max_diff || + seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) { + if (!batadv_has_timed_out(*last_reset, + BATADV_RESET_PROTECTION_MS)) + return true; + + *last_reset = jiffies; + if (protection_started) + *protection_started = true; + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "old packet received, start protection\n"); + } + + return false; +} + +/** + * batadv_check_management_packet() - Check preconditions for management packets + * @skb: incoming packet buffer + * @hard_iface: incoming hard interface + * @header_len: minimal header length of packet type + * + * Return: true when management preconditions are met, false otherwise + */ +bool batadv_check_management_packet(struct sk_buff *skb, + struct batadv_hard_iface *hard_iface, + int header_len) +{ + struct ethhdr *ethhdr; + + /* drop packet if it has not necessary minimum size */ + if (unlikely(!pskb_may_pull(skb, header_len))) + return false; + + ethhdr = eth_hdr(skb); + + /* packet with broadcast indication but unicast recipient */ + if (!is_broadcast_ether_addr(ethhdr->h_dest)) + return false; + + /* packet with invalid sender address */ + if (!is_valid_ether_addr(ethhdr->h_source)) + return false; + + /* create a copy of the skb, if needed, to modify it. */ + if (skb_cow(skb, 0) < 0) + return false; + + /* keep skb linear */ + if (skb_linearize(skb) < 0) + return false; + + return true; +} + +/** + * batadv_recv_my_icmp_packet() - receive an icmp packet locally + * @bat_priv: the bat priv with all the soft interface information + * @skb: icmp packet to process + * + * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP + * otherwise. + */ +static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, + struct sk_buff *skb) +{ + struct batadv_hard_iface *primary_if = NULL; + struct batadv_orig_node *orig_node = NULL; + struct batadv_icmp_header *icmph; + int res, ret = NET_RX_DROP; + + icmph = (struct batadv_icmp_header *)skb->data; + + switch (icmph->msg_type) { + case BATADV_ECHO_REQUEST: + /* answer echo request (ping) */ + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + goto out; + + /* get routing information */ + orig_node = batadv_orig_hash_find(bat_priv, icmph->orig); + if (!orig_node) + goto out; + + /* create a copy of the skb, if needed, to modify it. */ + if (skb_cow(skb, ETH_HLEN) < 0) + goto out; + + icmph = (struct batadv_icmp_header *)skb->data; + + ether_addr_copy(icmph->dst, icmph->orig); + ether_addr_copy(icmph->orig, primary_if->net_dev->dev_addr); + icmph->msg_type = BATADV_ECHO_REPLY; + icmph->ttl = BATADV_TTL; + + res = batadv_send_skb_to_orig(skb, orig_node, NULL); + if (res == NET_XMIT_SUCCESS) + ret = NET_RX_SUCCESS; + + /* skb was consumed */ + skb = NULL; + break; + case BATADV_TP: + if (!pskb_may_pull(skb, sizeof(struct batadv_icmp_tp_packet))) + goto out; + + batadv_tp_meter_recv(bat_priv, skb); + ret = NET_RX_SUCCESS; + /* skb was consumed */ + skb = NULL; + goto out; + default: + /* drop unknown type */ + goto out; + } +out: + batadv_hardif_put(primary_if); + batadv_orig_node_put(orig_node); + + kfree_skb(skb); + + return ret; +} + +static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv, + struct sk_buff *skb) +{ + struct batadv_hard_iface *primary_if = NULL; + struct batadv_orig_node *orig_node = NULL; + struct batadv_icmp_packet *icmp_packet; + int res, ret = NET_RX_DROP; + + icmp_packet = (struct batadv_icmp_packet *)skb->data; + + /* send TTL exceeded if packet is an echo request (traceroute) */ + if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { + pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", + icmp_packet->orig, icmp_packet->dst); + goto out; + } + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + goto out; + + /* get routing information */ + orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); + if (!orig_node) + goto out; + + /* create a copy of the skb, if needed, to modify it. */ + if (skb_cow(skb, ETH_HLEN) < 0) + goto out; + + icmp_packet = (struct batadv_icmp_packet *)skb->data; + + ether_addr_copy(icmp_packet->dst, icmp_packet->orig); + ether_addr_copy(icmp_packet->orig, primary_if->net_dev->dev_addr); + icmp_packet->msg_type = BATADV_TTL_EXCEEDED; + icmp_packet->ttl = BATADV_TTL; + + res = batadv_send_skb_to_orig(skb, orig_node, NULL); + if (res == NET_RX_SUCCESS) + ret = NET_XMIT_SUCCESS; + + /* skb was consumed */ + skb = NULL; + +out: + batadv_hardif_put(primary_if); + batadv_orig_node_put(orig_node); + + kfree_skb(skb); + + return ret; +} + +/** + * batadv_recv_icmp_packet() - Process incoming icmp packet + * @skb: incoming packet buffer + * @recv_if: incoming hard interface + * + * Return: NET_RX_SUCCESS on success or NET_RX_DROP in case of failure + */ +int batadv_recv_icmp_packet(struct sk_buff *skb, + struct batadv_hard_iface *recv_if) +{ + struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); + struct batadv_icmp_header *icmph; + struct batadv_icmp_packet_rr *icmp_packet_rr; + struct ethhdr *ethhdr; + struct batadv_orig_node *orig_node = NULL; + int hdr_size = sizeof(struct batadv_icmp_header); + int res, ret = NET_RX_DROP; + + /* drop packet if it has not necessary minimum size */ + if (unlikely(!pskb_may_pull(skb, hdr_size))) + goto free_skb; + + ethhdr = eth_hdr(skb); + + /* packet with unicast indication but non-unicast recipient */ + if (!is_valid_ether_addr(ethhdr->h_dest)) + goto free_skb; + + /* packet with broadcast/multicast sender address */ + if (is_multicast_ether_addr(ethhdr->h_source)) + goto free_skb; + + /* not for me */ + if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) + goto free_skb; + + icmph = (struct batadv_icmp_header *)skb->data; + + /* add record route information if not full */ + if ((icmph->msg_type == BATADV_ECHO_REPLY || + icmph->msg_type == BATADV_ECHO_REQUEST) && + skb->len >= sizeof(struct batadv_icmp_packet_rr)) { + if (skb_linearize(skb) < 0) + goto free_skb; + + /* create a copy of the skb, if needed, to modify it. */ + if (skb_cow(skb, ETH_HLEN) < 0) + goto free_skb; + + ethhdr = eth_hdr(skb); + icmph = (struct batadv_icmp_header *)skb->data; + icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmph; + if (icmp_packet_rr->rr_cur >= BATADV_RR_LEN) + goto free_skb; + + ether_addr_copy(icmp_packet_rr->rr[icmp_packet_rr->rr_cur], + ethhdr->h_dest); + icmp_packet_rr->rr_cur++; + } + + /* packet for me */ + if (batadv_is_my_mac(bat_priv, icmph->dst)) + return batadv_recv_my_icmp_packet(bat_priv, skb); + + /* TTL exceeded */ + if (icmph->ttl < 2) + return batadv_recv_icmp_ttl_exceeded(bat_priv, skb); + + /* get routing information */ + orig_node = batadv_orig_hash_find(bat_priv, icmph->dst); + if (!orig_node) + goto free_skb; + + /* create a copy of the skb, if needed, to modify it. */ + if (skb_cow(skb, ETH_HLEN) < 0) + goto put_orig_node; + + icmph = (struct batadv_icmp_header *)skb->data; + + /* decrement ttl */ + icmph->ttl--; + + /* route it */ + res = batadv_send_skb_to_orig(skb, orig_node, recv_if); + if (res == NET_XMIT_SUCCESS) + ret = NET_RX_SUCCESS; + + /* skb was consumed */ + skb = NULL; + +put_orig_node: + batadv_orig_node_put(orig_node); +free_skb: + kfree_skb(skb); + + return ret; +} + +/** + * batadv_check_unicast_packet() - Check for malformed unicast packets + * @bat_priv: the bat priv with all the soft interface information + * @skb: packet to check + * @hdr_size: size of header to pull + * + * Checks for short header and bad addresses in the given packet. + * + * Return: negative value when check fails and 0 otherwise. The negative value + * depends on the reason: -ENODATA for bad header, -EBADR for broadcast + * destination or source, and -EREMOTE for non-local (other host) destination. + */ +static int batadv_check_unicast_packet(struct batadv_priv *bat_priv, + struct sk_buff *skb, int hdr_size) +{ + struct ethhdr *ethhdr; + + /* drop packet if it has not necessary minimum size */ + if (unlikely(!pskb_may_pull(skb, hdr_size))) + return -ENODATA; + + ethhdr = eth_hdr(skb); + + /* packet with unicast indication but non-unicast recipient */ + if (!is_valid_ether_addr(ethhdr->h_dest)) + return -EBADR; + + /* packet with broadcast/multicast sender address */ + if (is_multicast_ether_addr(ethhdr->h_source)) + return -EBADR; + + /* not for me */ + if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) + return -EREMOTE; + + return 0; +} + +/** + * batadv_last_bonding_get() - Get last_bonding_candidate of orig_node + * @orig_node: originator node whose last bonding candidate should be retrieved + * + * Return: last bonding candidate of router or NULL if not found + * + * The object is returned with refcounter increased by 1. + */ +static struct batadv_orig_ifinfo * +batadv_last_bonding_get(struct batadv_orig_node *orig_node) +{ + struct batadv_orig_ifinfo *last_bonding_candidate; + + spin_lock_bh(&orig_node->neigh_list_lock); + last_bonding_candidate = orig_node->last_bonding_candidate; + + if (last_bonding_candidate) + kref_get(&last_bonding_candidate->refcount); + spin_unlock_bh(&orig_node->neigh_list_lock); + + return last_bonding_candidate; +} + +/** + * batadv_last_bonding_replace() - Replace last_bonding_candidate of orig_node + * @orig_node: originator node whose bonding candidates should be replaced + * @new_candidate: new bonding candidate or NULL + */ +static void +batadv_last_bonding_replace(struct batadv_orig_node *orig_node, + struct batadv_orig_ifinfo *new_candidate) +{ + struct batadv_orig_ifinfo *old_candidate; + + spin_lock_bh(&orig_node->neigh_list_lock); + old_candidate = orig_node->last_bonding_candidate; + + if (new_candidate) + kref_get(&new_candidate->refcount); + orig_node->last_bonding_candidate = new_candidate; + spin_unlock_bh(&orig_node->neigh_list_lock); + + batadv_orig_ifinfo_put(old_candidate); +} + +/** + * batadv_find_router() - find a suitable router for this originator + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: the destination node + * @recv_if: pointer to interface this packet was received on + * + * Return: the router which should be used for this orig_node on + * this interface, or NULL if not available. + */ +struct batadv_neigh_node * +batadv_find_router(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + struct batadv_hard_iface *recv_if) +{ + struct batadv_algo_ops *bao = bat_priv->algo_ops; + struct batadv_neigh_node *first_candidate_router = NULL; + struct batadv_neigh_node *next_candidate_router = NULL; + struct batadv_neigh_node *router, *cand_router = NULL; + struct batadv_neigh_node *last_cand_router = NULL; + struct batadv_orig_ifinfo *cand, *first_candidate = NULL; + struct batadv_orig_ifinfo *next_candidate = NULL; + struct batadv_orig_ifinfo *last_candidate; + bool last_candidate_found = false; + + if (!orig_node) + return NULL; + + router = batadv_orig_router_get(orig_node, recv_if); + + if (!router) + return router; + + /* only consider bonding for recv_if == BATADV_IF_DEFAULT (first hop) + * and if activated. + */ + if (!(recv_if == BATADV_IF_DEFAULT && atomic_read(&bat_priv->bonding))) + return router; + + /* bonding: loop through the list of possible routers found + * for the various outgoing interfaces and find a candidate after + * the last chosen bonding candidate (next_candidate). If no such + * router is found, use the first candidate found (the previously + * chosen bonding candidate might have been the last one in the list). + * If this can't be found either, return the previously chosen + * router - obviously there are no other candidates. + */ + rcu_read_lock(); + last_candidate = batadv_last_bonding_get(orig_node); + if (last_candidate) + last_cand_router = rcu_dereference(last_candidate->router); + + hlist_for_each_entry_rcu(cand, &orig_node->ifinfo_list, list) { + /* acquire some structures and references ... */ + if (!kref_get_unless_zero(&cand->refcount)) + continue; + + cand_router = rcu_dereference(cand->router); + if (!cand_router) + goto next; + + if (!kref_get_unless_zero(&cand_router->refcount)) { + cand_router = NULL; + goto next; + } + + /* alternative candidate should be good enough to be + * considered + */ + if (!bao->neigh.is_similar_or_better(cand_router, + cand->if_outgoing, router, + recv_if)) + goto next; + + /* don't use the same router twice */ + if (last_cand_router == cand_router) + goto next; + + /* mark the first possible candidate */ + if (!first_candidate) { + kref_get(&cand_router->refcount); + kref_get(&cand->refcount); + first_candidate = cand; + first_candidate_router = cand_router; + } + + /* check if the loop has already passed the previously selected + * candidate ... this function should select the next candidate + * AFTER the previously used bonding candidate. + */ + if (!last_candidate || last_candidate_found) { + next_candidate = cand; + next_candidate_router = cand_router; + break; + } + + if (last_candidate == cand) + last_candidate_found = true; +next: + /* free references */ + if (cand_router) { + batadv_neigh_node_put(cand_router); + cand_router = NULL; + } + batadv_orig_ifinfo_put(cand); + } + rcu_read_unlock(); + + /* After finding candidates, handle the three cases: + * 1) there is a next candidate, use that + * 2) there is no next candidate, use the first of the list + * 3) there is no candidate at all, return the default router + */ + if (next_candidate) { + batadv_neigh_node_put(router); + + kref_get(&next_candidate_router->refcount); + router = next_candidate_router; + batadv_last_bonding_replace(orig_node, next_candidate); + } else if (first_candidate) { + batadv_neigh_node_put(router); + + kref_get(&first_candidate_router->refcount); + router = first_candidate_router; + batadv_last_bonding_replace(orig_node, first_candidate); + } else { + batadv_last_bonding_replace(orig_node, NULL); + } + + /* cleanup of candidates */ + if (first_candidate) { + batadv_neigh_node_put(first_candidate_router); + batadv_orig_ifinfo_put(first_candidate); + } + + if (next_candidate) { + batadv_neigh_node_put(next_candidate_router); + batadv_orig_ifinfo_put(next_candidate); + } + + batadv_orig_ifinfo_put(last_candidate); + + return router; +} + +static int batadv_route_unicast_packet(struct sk_buff *skb, + struct batadv_hard_iface *recv_if) +{ + struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); + struct batadv_orig_node *orig_node = NULL; + struct batadv_unicast_packet *unicast_packet; + struct ethhdr *ethhdr = eth_hdr(skb); + int res, hdr_len, ret = NET_RX_DROP; + unsigned int len; + + unicast_packet = (struct batadv_unicast_packet *)skb->data; + + /* TTL exceeded */ + if (unicast_packet->ttl < 2) { + pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", + ethhdr->h_source, unicast_packet->dest); + goto free_skb; + } + + /* get routing information */ + orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest); + + if (!orig_node) + goto free_skb; + + /* create a copy of the skb, if needed, to modify it. */ + if (skb_cow(skb, ETH_HLEN) < 0) + goto put_orig_node; + + /* decrement ttl */ + unicast_packet = (struct batadv_unicast_packet *)skb->data; + unicast_packet->ttl--; + + switch (unicast_packet->packet_type) { + case BATADV_UNICAST_4ADDR: + hdr_len = sizeof(struct batadv_unicast_4addr_packet); + break; + case BATADV_UNICAST: + hdr_len = sizeof(struct batadv_unicast_packet); + break; + default: + /* other packet types not supported - yet */ + hdr_len = -1; + break; + } + + if (hdr_len > 0) + batadv_skb_set_priority(skb, hdr_len); + + len = skb->len; + res = batadv_send_skb_to_orig(skb, orig_node, recv_if); + + /* translate transmit result into receive result */ + if (res == NET_XMIT_SUCCESS) { + ret = NET_RX_SUCCESS; + /* skb was transmitted and consumed */ + batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); + batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, + len + ETH_HLEN); + } + + /* skb was consumed */ + skb = NULL; + +put_orig_node: + batadv_orig_node_put(orig_node); +free_skb: + kfree_skb(skb); + + return ret; +} + +/** + * batadv_reroute_unicast_packet() - update the unicast header for re-routing + * @bat_priv: the bat priv with all the soft interface information + * @skb: unicast packet to process + * @unicast_packet: the unicast header to be updated + * @dst_addr: the payload destination + * @vid: VLAN identifier + * + * Search the translation table for dst_addr and update the unicast header with + * the new corresponding information (originator address where the destination + * client currently is and its known TTVN) + * + * Return: true if the packet header has been updated, false otherwise + */ +static bool +batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, struct sk_buff *skb, + struct batadv_unicast_packet *unicast_packet, + u8 *dst_addr, unsigned short vid) +{ + struct batadv_orig_node *orig_node = NULL; + struct batadv_hard_iface *primary_if = NULL; + bool ret = false; + const u8 *orig_addr; + u8 orig_ttvn; + + if (batadv_is_my_client(bat_priv, dst_addr, vid)) { + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + goto out; + orig_addr = primary_if->net_dev->dev_addr; + orig_ttvn = (u8)atomic_read(&bat_priv->tt.vn); + } else { + orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr, + vid); + if (!orig_node) + goto out; + + if (batadv_compare_eth(orig_node->orig, unicast_packet->dest)) + goto out; + + orig_addr = orig_node->orig; + orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn); + } + + /* update the packet header */ + skb_postpull_rcsum(skb, unicast_packet, sizeof(*unicast_packet)); + ether_addr_copy(unicast_packet->dest, orig_addr); + unicast_packet->ttvn = orig_ttvn; + skb_postpush_rcsum(skb, unicast_packet, sizeof(*unicast_packet)); + + ret = true; +out: + batadv_hardif_put(primary_if); + batadv_orig_node_put(orig_node); + + return ret; +} + +static bool batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, + struct sk_buff *skb, int hdr_len) +{ + struct batadv_unicast_packet *unicast_packet; + struct batadv_hard_iface *primary_if; + struct batadv_orig_node *orig_node; + u8 curr_ttvn, old_ttvn; + struct ethhdr *ethhdr; + unsigned short vid; + int is_old_ttvn; + + /* check if there is enough data before accessing it */ + if (!pskb_may_pull(skb, hdr_len + ETH_HLEN)) + return false; + + /* create a copy of the skb (in case of for re-routing) to modify it. */ + if (skb_cow(skb, sizeof(*unicast_packet)) < 0) + return false; + + unicast_packet = (struct batadv_unicast_packet *)skb->data; + vid = batadv_get_vid(skb, hdr_len); + ethhdr = (struct ethhdr *)(skb->data + hdr_len); + + /* do not reroute multicast frames in a unicast header */ + if (is_multicast_ether_addr(ethhdr->h_dest)) + return true; + + /* check if the destination client was served by this node and it is now + * roaming. In this case, it means that the node has got a ROAM_ADV + * message and that it knows the new destination in the mesh to re-route + * the packet to + */ + if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) { + if (batadv_reroute_unicast_packet(bat_priv, skb, unicast_packet, + ethhdr->h_dest, vid)) + batadv_dbg_ratelimited(BATADV_DBG_TT, + bat_priv, + "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n", + unicast_packet->dest, + ethhdr->h_dest); + /* at this point the mesh destination should have been + * substituted with the originator address found in the global + * table. If not, let the packet go untouched anyway because + * there is nothing the node can do + */ + return true; + } + + /* retrieve the TTVN known by this node for the packet destination. This + * value is used later to check if the node which sent (or re-routed + * last time) the packet had an updated information or not + */ + curr_ttvn = (u8)atomic_read(&bat_priv->tt.vn); + if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) { + orig_node = batadv_orig_hash_find(bat_priv, + unicast_packet->dest); + /* if it is not possible to find the orig_node representing the + * destination, the packet can immediately be dropped as it will + * not be possible to deliver it + */ + if (!orig_node) + return false; + + curr_ttvn = (u8)atomic_read(&orig_node->last_ttvn); + batadv_orig_node_put(orig_node); + } + + /* check if the TTVN contained in the packet is fresher than what the + * node knows + */ + is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn); + if (!is_old_ttvn) + return true; + + old_ttvn = unicast_packet->ttvn; + /* the packet was forged based on outdated network information. Its + * destination can possibly be updated and forwarded towards the new + * target host + */ + if (batadv_reroute_unicast_packet(bat_priv, skb, unicast_packet, + ethhdr->h_dest, vid)) { + batadv_dbg_ratelimited(BATADV_DBG_TT, bat_priv, + "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n", + unicast_packet->dest, ethhdr->h_dest, + old_ttvn, curr_ttvn); + return true; + } + + /* the packet has not been re-routed: either the destination is + * currently served by this node or there is no destination at all and + * it is possible to drop the packet + */ + if (!batadv_is_my_client(bat_priv, ethhdr->h_dest, vid)) + return false; + + /* update the header in order to let the packet be delivered to this + * node's soft interface + */ + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + return false; + + /* update the packet header */ + skb_postpull_rcsum(skb, unicast_packet, sizeof(*unicast_packet)); + ether_addr_copy(unicast_packet->dest, primary_if->net_dev->dev_addr); + unicast_packet->ttvn = curr_ttvn; + skb_postpush_rcsum(skb, unicast_packet, sizeof(*unicast_packet)); + + batadv_hardif_put(primary_if); + + return true; +} + +/** + * batadv_recv_unhandled_unicast_packet() - receive and process packets which + * are in the unicast number space but not yet known to the implementation + * @skb: unicast tvlv packet to process + * @recv_if: pointer to interface this packet was received on + * + * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP + * otherwise. + */ +int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb, + struct batadv_hard_iface *recv_if) +{ + struct batadv_unicast_packet *unicast_packet; + struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); + int check, hdr_size = sizeof(*unicast_packet); + + check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); + if (check < 0) + goto free_skb; + + /* we don't know about this type, drop it. */ + unicast_packet = (struct batadv_unicast_packet *)skb->data; + if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) + goto free_skb; + + return batadv_route_unicast_packet(skb, recv_if); + +free_skb: + kfree_skb(skb); + return NET_RX_DROP; +} + +/** + * batadv_recv_unicast_packet() - Process incoming unicast packet + * @skb: incoming packet buffer + * @recv_if: incoming hard interface + * + * Return: NET_RX_SUCCESS on success or NET_RX_DROP in case of failure + */ +int batadv_recv_unicast_packet(struct sk_buff *skb, + struct batadv_hard_iface *recv_if) +{ + struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); + struct batadv_unicast_packet *unicast_packet; + struct batadv_unicast_4addr_packet *unicast_4addr_packet; + u8 *orig_addr, *orig_addr_gw; + struct batadv_orig_node *orig_node = NULL, *orig_node_gw = NULL; + int check, hdr_size = sizeof(*unicast_packet); + enum batadv_subtype subtype; + int ret = NET_RX_DROP; + bool is4addr, is_gw; + + unicast_packet = (struct batadv_unicast_packet *)skb->data; + is4addr = unicast_packet->packet_type == BATADV_UNICAST_4ADDR; + /* the caller function should have already pulled 2 bytes */ + if (is4addr) + hdr_size = sizeof(*unicast_4addr_packet); + + /* function returns -EREMOTE for promiscuous packets */ + check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); + + /* Even though the packet is not for us, we might save it to use for + * decoding a later received coded packet + */ + if (check == -EREMOTE) + batadv_nc_skb_store_sniffed_unicast(bat_priv, skb); + + if (check < 0) + goto free_skb; + if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size)) + goto free_skb; + + unicast_packet = (struct batadv_unicast_packet *)skb->data; + + /* packet for me */ + if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) { + /* If this is a unicast packet from another backgone gw, + * drop it. + */ + orig_addr_gw = eth_hdr(skb)->h_source; + orig_node_gw = batadv_orig_hash_find(bat_priv, orig_addr_gw); + if (orig_node_gw) { + is_gw = batadv_bla_is_backbone_gw(skb, orig_node_gw, + hdr_size); + batadv_orig_node_put(orig_node_gw); + if (is_gw) { + batadv_dbg(BATADV_DBG_BLA, bat_priv, + "%s(): Dropped unicast pkt received from another backbone gw %pM.\n", + __func__, orig_addr_gw); + goto free_skb; + } + } + + if (is4addr) { + unicast_4addr_packet = + (struct batadv_unicast_4addr_packet *)skb->data; + subtype = unicast_4addr_packet->subtype; + batadv_dat_inc_counter(bat_priv, subtype); + + /* Only payload data should be considered for speedy + * join. For example, DAT also uses unicast 4addr + * types, but those packets should not be considered + * for speedy join, since the clients do not actually + * reside at the sending originator. + */ + if (subtype == BATADV_P_DATA) { + orig_addr = unicast_4addr_packet->src; + orig_node = batadv_orig_hash_find(bat_priv, + orig_addr); + } + } + + if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, + hdr_size)) + goto rx_success; + if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, + hdr_size)) + goto rx_success; + + batadv_dat_snoop_incoming_dhcp_ack(bat_priv, skb, hdr_size); + + batadv_interface_rx(recv_if->soft_iface, skb, hdr_size, + orig_node); + +rx_success: + batadv_orig_node_put(orig_node); + + return NET_RX_SUCCESS; + } + + ret = batadv_route_unicast_packet(skb, recv_if); + /* skb was consumed */ + skb = NULL; + +free_skb: + kfree_skb(skb); + + return ret; +} + +/** + * batadv_recv_unicast_tvlv() - receive and process unicast tvlv packets + * @skb: unicast tvlv packet to process + * @recv_if: pointer to interface this packet was received on + * + * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP + * otherwise. + */ +int batadv_recv_unicast_tvlv(struct sk_buff *skb, + struct batadv_hard_iface *recv_if) +{ + struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); + struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; + unsigned char *tvlv_buff; + u16 tvlv_buff_len; + int hdr_size = sizeof(*unicast_tvlv_packet); + int ret = NET_RX_DROP; + + if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0) + goto free_skb; + + /* the header is likely to be modified while forwarding */ + if (skb_cow(skb, hdr_size) < 0) + goto free_skb; + + /* packet needs to be linearized to access the tvlv content */ + if (skb_linearize(skb) < 0) + goto free_skb; + + unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)skb->data; + + tvlv_buff = (unsigned char *)(skb->data + hdr_size); + tvlv_buff_len = ntohs(unicast_tvlv_packet->tvlv_len); + + if (tvlv_buff_len > skb->len - hdr_size) + goto free_skb; + + ret = batadv_tvlv_containers_process(bat_priv, false, NULL, + unicast_tvlv_packet->src, + unicast_tvlv_packet->dst, + tvlv_buff, tvlv_buff_len); + + if (ret != NET_RX_SUCCESS) { + ret = batadv_route_unicast_packet(skb, recv_if); + /* skb was consumed */ + skb = NULL; + } + +free_skb: + kfree_skb(skb); + + return ret; +} + +/** + * batadv_recv_frag_packet() - process received fragment + * @skb: the received fragment + * @recv_if: interface that the skb is received on + * + * This function does one of the three following things: 1) Forward fragment, if + * the assembled packet will exceed our MTU; 2) Buffer fragment, if we still + * lack further fragments; 3) Merge fragments, if we have all needed parts. + * + * Return: NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise. + */ +int batadv_recv_frag_packet(struct sk_buff *skb, + struct batadv_hard_iface *recv_if) +{ + struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); + struct batadv_orig_node *orig_node_src = NULL; + struct batadv_frag_packet *frag_packet; + int ret = NET_RX_DROP; + + if (batadv_check_unicast_packet(bat_priv, skb, + sizeof(*frag_packet)) < 0) + goto free_skb; + + frag_packet = (struct batadv_frag_packet *)skb->data; + orig_node_src = batadv_orig_hash_find(bat_priv, frag_packet->orig); + if (!orig_node_src) + goto free_skb; + + skb->priority = frag_packet->priority + 256; + + /* Route the fragment if it is not for us and too big to be merged. */ + if (!batadv_is_my_mac(bat_priv, frag_packet->dest) && + batadv_frag_skb_fwd(skb, recv_if, orig_node_src)) { + /* skb was consumed */ + skb = NULL; + ret = NET_RX_SUCCESS; + goto put_orig_node; + } + + batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_RX); + batadv_add_counter(bat_priv, BATADV_CNT_FRAG_RX_BYTES, skb->len); + + /* Add fragment to buffer and merge if possible. */ + if (!batadv_frag_skb_buffer(&skb, orig_node_src)) + goto put_orig_node; + + /* Deliver merged packet to the appropriate handler, if it was + * merged + */ + if (skb) { + batadv_batman_skb_recv(skb, recv_if->net_dev, + &recv_if->batman_adv_ptype, NULL); + /* skb was consumed */ + skb = NULL; + } + + ret = NET_RX_SUCCESS; + +put_orig_node: + batadv_orig_node_put(orig_node_src); +free_skb: + kfree_skb(skb); + + return ret; +} + +/** + * batadv_recv_bcast_packet() - Process incoming broadcast packet + * @skb: incoming packet buffer + * @recv_if: incoming hard interface + * + * Return: NET_RX_SUCCESS on success or NET_RX_DROP in case of failure + */ +int batadv_recv_bcast_packet(struct sk_buff *skb, + struct batadv_hard_iface *recv_if) +{ + struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); + struct batadv_orig_node *orig_node = NULL; + struct batadv_bcast_packet *bcast_packet; + struct ethhdr *ethhdr; + int hdr_size = sizeof(*bcast_packet); + s32 seq_diff; + u32 seqno; + int ret; + + /* drop packet if it has not necessary minimum size */ + if (unlikely(!pskb_may_pull(skb, hdr_size))) + goto free_skb; + + ethhdr = eth_hdr(skb); + + /* packet with broadcast indication but unicast recipient */ + if (!is_broadcast_ether_addr(ethhdr->h_dest)) + goto free_skb; + + /* packet with broadcast/multicast sender address */ + if (is_multicast_ether_addr(ethhdr->h_source)) + goto free_skb; + + /* ignore broadcasts sent by myself */ + if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) + goto free_skb; + + bcast_packet = (struct batadv_bcast_packet *)skb->data; + + /* ignore broadcasts originated by myself */ + if (batadv_is_my_mac(bat_priv, bcast_packet->orig)) + goto free_skb; + + if (bcast_packet->ttl-- < 2) + goto free_skb; + + orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); + + if (!orig_node) + goto free_skb; + + spin_lock_bh(&orig_node->bcast_seqno_lock); + + seqno = ntohl(bcast_packet->seqno); + /* check whether the packet is a duplicate */ + if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno, + seqno)) + goto spin_unlock; + + seq_diff = seqno - orig_node->last_bcast_seqno; + + /* check whether the packet is old and the host just restarted. */ + if (batadv_window_protected(bat_priv, seq_diff, + BATADV_BCAST_MAX_AGE, + &orig_node->bcast_seqno_reset, NULL)) + goto spin_unlock; + + /* mark broadcast in flood history, update window position + * if required. + */ + if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) + orig_node->last_bcast_seqno = seqno; + + spin_unlock_bh(&orig_node->bcast_seqno_lock); + + /* check whether this has been sent by another originator before */ + if (batadv_bla_check_bcast_duplist(bat_priv, skb)) + goto free_skb; + + batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet)); + + /* rebroadcast packet */ + ret = batadv_forw_bcast_packet(bat_priv, skb, 0, false); + if (ret == NETDEV_TX_BUSY) + goto free_skb; + + /* don't hand the broadcast up if it is from an originator + * from the same backbone. + */ + if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size)) + goto free_skb; + + if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size)) + goto rx_success; + if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size)) + goto rx_success; + + batadv_dat_snoop_incoming_dhcp_ack(bat_priv, skb, hdr_size); + + /* broadcast for me */ + batadv_interface_rx(recv_if->soft_iface, skb, hdr_size, orig_node); + +rx_success: + ret = NET_RX_SUCCESS; + goto out; + +spin_unlock: + spin_unlock_bh(&orig_node->bcast_seqno_lock); +free_skb: + kfree_skb(skb); + ret = NET_RX_DROP; +out: + batadv_orig_node_put(orig_node); + return ret; +} diff --git a/net/batman-adv/routing.h b/net/batman-adv/routing.h new file mode 100644 index 000000000..5f387786e --- /dev/null +++ b/net/batman-adv/routing.h @@ -0,0 +1,46 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + */ + +#ifndef _NET_BATMAN_ADV_ROUTING_H_ +#define _NET_BATMAN_ADV_ROUTING_H_ + +#include "main.h" + +#include <linux/skbuff.h> +#include <linux/types.h> + +bool batadv_check_management_packet(struct sk_buff *skb, + struct batadv_hard_iface *hard_iface, + int header_len); +void batadv_update_route(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + struct batadv_hard_iface *recv_if, + struct batadv_neigh_node *neigh_node); +int batadv_recv_icmp_packet(struct sk_buff *skb, + struct batadv_hard_iface *recv_if); +int batadv_recv_unicast_packet(struct sk_buff *skb, + struct batadv_hard_iface *recv_if); +int batadv_recv_frag_packet(struct sk_buff *skb, + struct batadv_hard_iface *iface); +int batadv_recv_bcast_packet(struct sk_buff *skb, + struct batadv_hard_iface *recv_if); +int batadv_recv_tt_query(struct sk_buff *skb, + struct batadv_hard_iface *recv_if); +int batadv_recv_roam_adv(struct sk_buff *skb, + struct batadv_hard_iface *recv_if); +int batadv_recv_unicast_tvlv(struct sk_buff *skb, + struct batadv_hard_iface *recv_if); +int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb, + struct batadv_hard_iface *recv_if); +struct batadv_neigh_node * +batadv_find_router(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + struct batadv_hard_iface *recv_if); +bool batadv_window_protected(struct batadv_priv *bat_priv, s32 seq_num_diff, + s32 seq_old_max_diff, unsigned long *last_reset, + bool *protection_started); + +#endif /* _NET_BATMAN_ADV_ROUTING_H_ */ diff --git a/net/batman-adv/send.c b/net/batman-adv/send.c new file mode 100644 index 000000000..0379b1268 --- /dev/null +++ b/net/batman-adv/send.c @@ -0,0 +1,1135 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + */ + +#include "send.h" +#include "main.h" + +#include <linux/atomic.h> +#include <linux/bug.h> +#include <linux/byteorder/generic.h> +#include <linux/container_of.h> +#include <linux/errno.h> +#include <linux/etherdevice.h> +#include <linux/gfp.h> +#include <linux/if.h> +#include <linux/if_ether.h> +#include <linux/jiffies.h> +#include <linux/kref.h> +#include <linux/list.h> +#include <linux/netdevice.h> +#include <linux/printk.h> +#include <linux/rculist.h> +#include <linux/rcupdate.h> +#include <linux/skbuff.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/stddef.h> +#include <linux/workqueue.h> + +#include "distributed-arp-table.h" +#include "fragmentation.h" +#include "gateway_client.h" +#include "hard-interface.h" +#include "log.h" +#include "network-coding.h" +#include "originator.h" +#include "routing.h" +#include "soft-interface.h" +#include "translation-table.h" + +static void batadv_send_outstanding_bcast_packet(struct work_struct *work); + +/** + * batadv_send_skb_packet() - send an already prepared packet + * @skb: the packet to send + * @hard_iface: the interface to use to send the broadcast packet + * @dst_addr: the payload destination + * + * Send out an already prepared packet to the given neighbor or broadcast it + * using the specified interface. Either hard_iface or neigh_node must be not + * NULL. + * If neigh_node is NULL, then the packet is broadcasted using hard_iface, + * otherwise it is sent as unicast to the given neighbor. + * + * Regardless of the return value, the skb is consumed. + * + * Return: A negative errno code is returned on a failure. A success does not + * guarantee the frame will be transmitted as it may be dropped due + * to congestion or traffic shaping. + */ +int batadv_send_skb_packet(struct sk_buff *skb, + struct batadv_hard_iface *hard_iface, + const u8 *dst_addr) +{ + struct batadv_priv *bat_priv; + struct ethhdr *ethhdr; + int ret; + + bat_priv = netdev_priv(hard_iface->soft_iface); + + if (hard_iface->if_status != BATADV_IF_ACTIVE) + goto send_skb_err; + + if (unlikely(!hard_iface->net_dev)) + goto send_skb_err; + + if (!(hard_iface->net_dev->flags & IFF_UP)) { + pr_warn("Interface %s is not up - can't send packet via that interface!\n", + hard_iface->net_dev->name); + goto send_skb_err; + } + + /* push to the ethernet header. */ + if (batadv_skb_head_push(skb, ETH_HLEN) < 0) + goto send_skb_err; + + skb_reset_mac_header(skb); + + ethhdr = eth_hdr(skb); + ether_addr_copy(ethhdr->h_source, hard_iface->net_dev->dev_addr); + ether_addr_copy(ethhdr->h_dest, dst_addr); + ethhdr->h_proto = htons(ETH_P_BATMAN); + + skb_set_network_header(skb, ETH_HLEN); + skb->protocol = htons(ETH_P_BATMAN); + + skb->dev = hard_iface->net_dev; + + /* Save a clone of the skb to use when decoding coded packets */ + batadv_nc_skb_store_for_decoding(bat_priv, skb); + + /* dev_queue_xmit() returns a negative result on error. However on + * congestion and traffic shaping, it drops and returns NET_XMIT_DROP + * (which is > 0). This will not be treated as an error. + */ + ret = dev_queue_xmit(skb); + return net_xmit_eval(ret); +send_skb_err: + kfree_skb(skb); + return NET_XMIT_DROP; +} + +/** + * batadv_send_broadcast_skb() - Send broadcast packet via hard interface + * @skb: packet to be transmitted (with batadv header and no outer eth header) + * @hard_iface: outgoing interface + * + * Return: A negative errno code is returned on a failure. A success does not + * guarantee the frame will be transmitted as it may be dropped due + * to congestion or traffic shaping. + */ +int batadv_send_broadcast_skb(struct sk_buff *skb, + struct batadv_hard_iface *hard_iface) +{ + return batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr); +} + +/** + * batadv_send_unicast_skb() - Send unicast packet to neighbor + * @skb: packet to be transmitted (with batadv header and no outer eth header) + * @neigh: neighbor which is used as next hop to destination + * + * Return: A negative errno code is returned on a failure. A success does not + * guarantee the frame will be transmitted as it may be dropped due + * to congestion or traffic shaping. + */ +int batadv_send_unicast_skb(struct sk_buff *skb, + struct batadv_neigh_node *neigh) +{ +#ifdef CONFIG_BATMAN_ADV_BATMAN_V + struct batadv_hardif_neigh_node *hardif_neigh; +#endif + int ret; + + ret = batadv_send_skb_packet(skb, neigh->if_incoming, neigh->addr); + +#ifdef CONFIG_BATMAN_ADV_BATMAN_V + hardif_neigh = batadv_hardif_neigh_get(neigh->if_incoming, neigh->addr); + + if (hardif_neigh && ret != NET_XMIT_DROP) + hardif_neigh->bat_v.last_unicast_tx = jiffies; + + batadv_hardif_neigh_put(hardif_neigh); +#endif + + return ret; +} + +/** + * batadv_send_skb_to_orig() - Lookup next-hop and transmit skb. + * @skb: Packet to be transmitted. + * @orig_node: Final destination of the packet. + * @recv_if: Interface used when receiving the packet (can be NULL). + * + * Looks up the best next-hop towards the passed originator and passes the + * skb on for preparation of MAC header. If the packet originated from this + * host, NULL can be passed as recv_if and no interface alternating is + * attempted. + * + * Return: negative errno code on a failure, -EINPROGRESS if the skb is + * buffered for later transmit or the NET_XMIT status returned by the + * lower routine if the packet has been passed down. + */ +int batadv_send_skb_to_orig(struct sk_buff *skb, + struct batadv_orig_node *orig_node, + struct batadv_hard_iface *recv_if) +{ + struct batadv_priv *bat_priv = orig_node->bat_priv; + struct batadv_neigh_node *neigh_node; + int ret; + + /* batadv_find_router() increases neigh_nodes refcount if found. */ + neigh_node = batadv_find_router(bat_priv, orig_node, recv_if); + if (!neigh_node) { + ret = -EINVAL; + goto free_skb; + } + + /* Check if the skb is too large to send in one piece and fragment + * it if needed. + */ + if (atomic_read(&bat_priv->fragmentation) && + skb->len > neigh_node->if_incoming->net_dev->mtu) { + /* Fragment and send packet. */ + ret = batadv_frag_send_packet(skb, orig_node, neigh_node); + /* skb was consumed */ + skb = NULL; + + goto put_neigh_node; + } + + /* try to network code the packet, if it is received on an interface + * (i.e. being forwarded). If the packet originates from this node or if + * network coding fails, then send the packet as usual. + */ + if (recv_if && batadv_nc_skb_forward(skb, neigh_node)) + ret = -EINPROGRESS; + else + ret = batadv_send_unicast_skb(skb, neigh_node); + + /* skb was consumed */ + skb = NULL; + +put_neigh_node: + batadv_neigh_node_put(neigh_node); +free_skb: + kfree_skb(skb); + + return ret; +} + +/** + * batadv_send_skb_push_fill_unicast() - extend the buffer and initialize the + * common fields for unicast packets + * @skb: the skb carrying the unicast header to initialize + * @hdr_size: amount of bytes to push at the beginning of the skb + * @orig_node: the destination node + * + * Return: false if the buffer extension was not possible or true otherwise. + */ +static bool +batadv_send_skb_push_fill_unicast(struct sk_buff *skb, int hdr_size, + struct batadv_orig_node *orig_node) +{ + struct batadv_unicast_packet *unicast_packet; + u8 ttvn = (u8)atomic_read(&orig_node->last_ttvn); + + if (batadv_skb_head_push(skb, hdr_size) < 0) + return false; + + unicast_packet = (struct batadv_unicast_packet *)skb->data; + unicast_packet->version = BATADV_COMPAT_VERSION; + /* batman packet type: unicast */ + unicast_packet->packet_type = BATADV_UNICAST; + /* set unicast ttl */ + unicast_packet->ttl = BATADV_TTL; + /* copy the destination for faster routing */ + ether_addr_copy(unicast_packet->dest, orig_node->orig); + /* set the destination tt version number */ + unicast_packet->ttvn = ttvn; + + return true; +} + +/** + * batadv_send_skb_prepare_unicast() - encapsulate an skb with a unicast header + * @skb: the skb containing the payload to encapsulate + * @orig_node: the destination node + * + * Return: false if the payload could not be encapsulated or true otherwise. + */ +static bool batadv_send_skb_prepare_unicast(struct sk_buff *skb, + struct batadv_orig_node *orig_node) +{ + size_t uni_size = sizeof(struct batadv_unicast_packet); + + return batadv_send_skb_push_fill_unicast(skb, uni_size, orig_node); +} + +/** + * batadv_send_skb_prepare_unicast_4addr() - encapsulate an skb with a + * unicast 4addr header + * @bat_priv: the bat priv with all the soft interface information + * @skb: the skb containing the payload to encapsulate + * @orig: the destination node + * @packet_subtype: the unicast 4addr packet subtype to use + * + * Return: false if the payload could not be encapsulated or true otherwise. + */ +bool batadv_send_skb_prepare_unicast_4addr(struct batadv_priv *bat_priv, + struct sk_buff *skb, + struct batadv_orig_node *orig, + int packet_subtype) +{ + struct batadv_hard_iface *primary_if; + struct batadv_unicast_4addr_packet *uc_4addr_packet; + bool ret = false; + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + goto out; + + /* Pull the header space and fill the unicast_packet substructure. + * We can do that because the first member of the uc_4addr_packet + * is of type struct unicast_packet + */ + if (!batadv_send_skb_push_fill_unicast(skb, sizeof(*uc_4addr_packet), + orig)) + goto out; + + uc_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; + uc_4addr_packet->u.packet_type = BATADV_UNICAST_4ADDR; + ether_addr_copy(uc_4addr_packet->src, primary_if->net_dev->dev_addr); + uc_4addr_packet->subtype = packet_subtype; + uc_4addr_packet->reserved = 0; + + ret = true; +out: + batadv_hardif_put(primary_if); + return ret; +} + +/** + * batadv_send_skb_unicast() - encapsulate and send an skb via unicast + * @bat_priv: the bat priv with all the soft interface information + * @skb: payload to send + * @packet_type: the batman unicast packet type to use + * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast + * 4addr packets) + * @orig_node: the originator to send the packet to + * @vid: the vid to be used to search the translation table + * + * Wrap the given skb into a batman-adv unicast or unicast-4addr header + * depending on whether BATADV_UNICAST or BATADV_UNICAST_4ADDR was supplied + * as packet_type. Then send this frame to the given orig_node. + * + * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. + */ +int batadv_send_skb_unicast(struct batadv_priv *bat_priv, + struct sk_buff *skb, int packet_type, + int packet_subtype, + struct batadv_orig_node *orig_node, + unsigned short vid) +{ + struct batadv_unicast_packet *unicast_packet; + struct ethhdr *ethhdr; + int ret = NET_XMIT_DROP; + + if (!orig_node) + goto out; + + switch (packet_type) { + case BATADV_UNICAST: + if (!batadv_send_skb_prepare_unicast(skb, orig_node)) + goto out; + break; + case BATADV_UNICAST_4ADDR: + if (!batadv_send_skb_prepare_unicast_4addr(bat_priv, skb, + orig_node, + packet_subtype)) + goto out; + break; + default: + /* this function supports UNICAST and UNICAST_4ADDR only. It + * should never be invoked with any other packet type + */ + goto out; + } + + /* skb->data might have been reallocated by + * batadv_send_skb_prepare_unicast{,_4addr}() + */ + ethhdr = eth_hdr(skb); + unicast_packet = (struct batadv_unicast_packet *)skb->data; + + /* inform the destination node that we are still missing a correct route + * for this client. The destination will receive this packet and will + * try to reroute it because the ttvn contained in the header is less + * than the current one + */ + if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) + unicast_packet->ttvn = unicast_packet->ttvn - 1; + + ret = batadv_send_skb_to_orig(skb, orig_node, NULL); + /* skb was consumed */ + skb = NULL; + +out: + kfree_skb(skb); + return ret; +} + +/** + * batadv_send_skb_via_tt_generic() - send an skb via TT lookup + * @bat_priv: the bat priv with all the soft interface information + * @skb: payload to send + * @packet_type: the batman unicast packet type to use + * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast + * 4addr packets) + * @dst_hint: can be used to override the destination contained in the skb + * @vid: the vid to be used to search the translation table + * + * Look up the recipient node for the destination address in the ethernet + * header via the translation table. Wrap the given skb into a batman-adv + * unicast or unicast-4addr header depending on whether BATADV_UNICAST or + * BATADV_UNICAST_4ADDR was supplied as packet_type. Then send this frame + * to the according destination node. + * + * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. + */ +int batadv_send_skb_via_tt_generic(struct batadv_priv *bat_priv, + struct sk_buff *skb, int packet_type, + int packet_subtype, u8 *dst_hint, + unsigned short vid) +{ + struct ethhdr *ethhdr = (struct ethhdr *)skb->data; + struct batadv_orig_node *orig_node; + u8 *src, *dst; + int ret; + + src = ethhdr->h_source; + dst = ethhdr->h_dest; + + /* if we got an hint! let's send the packet to this client (if any) */ + if (dst_hint) { + src = NULL; + dst = dst_hint; + } + orig_node = batadv_transtable_search(bat_priv, src, dst, vid); + + ret = batadv_send_skb_unicast(bat_priv, skb, packet_type, + packet_subtype, orig_node, vid); + + batadv_orig_node_put(orig_node); + + return ret; +} + +/** + * batadv_send_skb_via_gw() - send an skb via gateway lookup + * @bat_priv: the bat priv with all the soft interface information + * @skb: payload to send + * @vid: the vid to be used to search the translation table + * + * Look up the currently selected gateway. Wrap the given skb into a batman-adv + * unicast header and send this frame to this gateway node. + * + * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. + */ +int batadv_send_skb_via_gw(struct batadv_priv *bat_priv, struct sk_buff *skb, + unsigned short vid) +{ + struct batadv_orig_node *orig_node; + int ret; + + orig_node = batadv_gw_get_selected_orig(bat_priv); + ret = batadv_send_skb_unicast(bat_priv, skb, BATADV_UNICAST_4ADDR, + BATADV_P_DATA, orig_node, vid); + + batadv_orig_node_put(orig_node); + + return ret; +} + +/** + * batadv_forw_packet_free() - free a forwarding packet + * @forw_packet: The packet to free + * @dropped: whether the packet is freed because is dropped + * + * This frees a forwarding packet and releases any resources it might + * have claimed. + */ +void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet, + bool dropped) +{ + if (dropped) + kfree_skb(forw_packet->skb); + else + consume_skb(forw_packet->skb); + + batadv_hardif_put(forw_packet->if_incoming); + batadv_hardif_put(forw_packet->if_outgoing); + if (forw_packet->queue_left) + atomic_inc(forw_packet->queue_left); + kfree(forw_packet); +} + +/** + * batadv_forw_packet_alloc() - allocate a forwarding packet + * @if_incoming: The (optional) if_incoming to be grabbed + * @if_outgoing: The (optional) if_outgoing to be grabbed + * @queue_left: The (optional) queue counter to decrease + * @bat_priv: The bat_priv for the mesh of this forw_packet + * @skb: The raw packet this forwarding packet shall contain + * + * Allocates a forwarding packet and tries to get a reference to the + * (optional) if_incoming, if_outgoing and queue_left. If queue_left + * is NULL then bat_priv is optional, too. + * + * Return: An allocated forwarding packet on success, NULL otherwise. + */ +struct batadv_forw_packet * +batadv_forw_packet_alloc(struct batadv_hard_iface *if_incoming, + struct batadv_hard_iface *if_outgoing, + atomic_t *queue_left, + struct batadv_priv *bat_priv, + struct sk_buff *skb) +{ + struct batadv_forw_packet *forw_packet; + const char *qname; + + if (queue_left && !batadv_atomic_dec_not_zero(queue_left)) { + qname = "unknown"; + + if (queue_left == &bat_priv->bcast_queue_left) + qname = "bcast"; + + if (queue_left == &bat_priv->batman_queue_left) + qname = "batman"; + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "%s queue is full\n", qname); + + return NULL; + } + + forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC); + if (!forw_packet) + goto err; + + if (if_incoming) + kref_get(&if_incoming->refcount); + + if (if_outgoing) + kref_get(&if_outgoing->refcount); + + INIT_HLIST_NODE(&forw_packet->list); + INIT_HLIST_NODE(&forw_packet->cleanup_list); + forw_packet->skb = skb; + forw_packet->queue_left = queue_left; + forw_packet->if_incoming = if_incoming; + forw_packet->if_outgoing = if_outgoing; + forw_packet->num_packets = 0; + + return forw_packet; + +err: + if (queue_left) + atomic_inc(queue_left); + + return NULL; +} + +/** + * batadv_forw_packet_was_stolen() - check whether someone stole this packet + * @forw_packet: the forwarding packet to check + * + * This function checks whether the given forwarding packet was claimed by + * someone else for free(). + * + * Return: True if someone stole it, false otherwise. + */ +static bool +batadv_forw_packet_was_stolen(struct batadv_forw_packet *forw_packet) +{ + return !hlist_unhashed(&forw_packet->cleanup_list); +} + +/** + * batadv_forw_packet_steal() - claim a forw_packet for free() + * @forw_packet: the forwarding packet to steal + * @lock: a key to the store to steal from (e.g. forw_{bat,bcast}_list_lock) + * + * This function tries to steal a specific forw_packet from global + * visibility for the purpose of getting it for free(). That means + * the caller is *not* allowed to requeue it afterwards. + * + * Return: True if stealing was successful. False if someone else stole it + * before us. + */ +bool batadv_forw_packet_steal(struct batadv_forw_packet *forw_packet, + spinlock_t *lock) +{ + /* did purging routine steal it earlier? */ + spin_lock_bh(lock); + if (batadv_forw_packet_was_stolen(forw_packet)) { + spin_unlock_bh(lock); + return false; + } + + hlist_del_init(&forw_packet->list); + + /* Just to spot misuse of this function */ + hlist_add_fake(&forw_packet->cleanup_list); + + spin_unlock_bh(lock); + return true; +} + +/** + * batadv_forw_packet_list_steal() - claim a list of forward packets for free() + * @forw_list: the to be stolen forward packets + * @cleanup_list: a backup pointer, to be able to dispose the packet later + * @hard_iface: the interface to steal forward packets from + * + * This function claims responsibility to free any forw_packet queued on the + * given hard_iface. If hard_iface is NULL forwarding packets on all hard + * interfaces will be claimed. + * + * The packets are being moved from the forw_list to the cleanup_list. This + * makes it possible for already running threads to notice the claim. + */ +static void +batadv_forw_packet_list_steal(struct hlist_head *forw_list, + struct hlist_head *cleanup_list, + const struct batadv_hard_iface *hard_iface) +{ + struct batadv_forw_packet *forw_packet; + struct hlist_node *safe_tmp_node; + + hlist_for_each_entry_safe(forw_packet, safe_tmp_node, + forw_list, list) { + /* if purge_outstanding_packets() was called with an argument + * we delete only packets belonging to the given interface + */ + if (hard_iface && + forw_packet->if_incoming != hard_iface && + forw_packet->if_outgoing != hard_iface) + continue; + + hlist_del(&forw_packet->list); + hlist_add_head(&forw_packet->cleanup_list, cleanup_list); + } +} + +/** + * batadv_forw_packet_list_free() - free a list of forward packets + * @head: a list of to be freed forw_packets + * + * This function cancels the scheduling of any packet in the provided list, + * waits for any possibly running packet forwarding thread to finish and + * finally, safely frees this forward packet. + * + * This function might sleep. + */ +static void batadv_forw_packet_list_free(struct hlist_head *head) +{ + struct batadv_forw_packet *forw_packet; + struct hlist_node *safe_tmp_node; + + hlist_for_each_entry_safe(forw_packet, safe_tmp_node, head, + cleanup_list) { + cancel_delayed_work_sync(&forw_packet->delayed_work); + + hlist_del(&forw_packet->cleanup_list); + batadv_forw_packet_free(forw_packet, true); + } +} + +/** + * batadv_forw_packet_queue() - try to queue a forwarding packet + * @forw_packet: the forwarding packet to queue + * @lock: a key to the store (e.g. forw_{bat,bcast}_list_lock) + * @head: the shelve to queue it on (e.g. forw_{bat,bcast}_list) + * @send_time: timestamp (jiffies) when the packet is to be sent + * + * This function tries to (re)queue a forwarding packet. Requeuing + * is prevented if the according interface is shutting down + * (e.g. if batadv_forw_packet_list_steal() was called for this + * packet earlier). + * + * Calling batadv_forw_packet_queue() after a call to + * batadv_forw_packet_steal() is forbidden! + * + * Caller needs to ensure that forw_packet->delayed_work was initialized. + */ +static void batadv_forw_packet_queue(struct batadv_forw_packet *forw_packet, + spinlock_t *lock, struct hlist_head *head, + unsigned long send_time) +{ + spin_lock_bh(lock); + + /* did purging routine steal it from us? */ + if (batadv_forw_packet_was_stolen(forw_packet)) { + /* If you got it for free() without trouble, then + * don't get back into the queue after stealing... + */ + WARN_ONCE(hlist_fake(&forw_packet->cleanup_list), + "Requeuing after batadv_forw_packet_steal() not allowed!\n"); + + spin_unlock_bh(lock); + return; + } + + hlist_del_init(&forw_packet->list); + hlist_add_head(&forw_packet->list, head); + + queue_delayed_work(batadv_event_workqueue, + &forw_packet->delayed_work, + send_time - jiffies); + spin_unlock_bh(lock); +} + +/** + * batadv_forw_packet_bcast_queue() - try to queue a broadcast packet + * @bat_priv: the bat priv with all the soft interface information + * @forw_packet: the forwarding packet to queue + * @send_time: timestamp (jiffies) when the packet is to be sent + * + * This function tries to (re)queue a broadcast packet. + * + * Caller needs to ensure that forw_packet->delayed_work was initialized. + */ +static void +batadv_forw_packet_bcast_queue(struct batadv_priv *bat_priv, + struct batadv_forw_packet *forw_packet, + unsigned long send_time) +{ + batadv_forw_packet_queue(forw_packet, &bat_priv->forw_bcast_list_lock, + &bat_priv->forw_bcast_list, send_time); +} + +/** + * batadv_forw_packet_ogmv1_queue() - try to queue an OGMv1 packet + * @bat_priv: the bat priv with all the soft interface information + * @forw_packet: the forwarding packet to queue + * @send_time: timestamp (jiffies) when the packet is to be sent + * + * This function tries to (re)queue an OGMv1 packet. + * + * Caller needs to ensure that forw_packet->delayed_work was initialized. + */ +void batadv_forw_packet_ogmv1_queue(struct batadv_priv *bat_priv, + struct batadv_forw_packet *forw_packet, + unsigned long send_time) +{ + batadv_forw_packet_queue(forw_packet, &bat_priv->forw_bat_list_lock, + &bat_priv->forw_bat_list, send_time); +} + +/** + * batadv_forw_bcast_packet_to_list() - queue broadcast packet for transmissions + * @bat_priv: the bat priv with all the soft interface information + * @skb: broadcast packet to add + * @delay: number of jiffies to wait before sending + * @own_packet: true if it is a self-generated broadcast packet + * @if_in: the interface where the packet was received on + * @if_out: the outgoing interface to queue on + * + * Adds a broadcast packet to the queue and sets up timers. Broadcast packets + * are sent multiple times to increase probability for being received. + * + * This call clones the given skb, hence the caller needs to take into + * account that the data segment of the original skb might not be + * modifiable anymore. + * + * Return: NETDEV_TX_OK on success and NETDEV_TX_BUSY on errors. + */ +static int batadv_forw_bcast_packet_to_list(struct batadv_priv *bat_priv, + struct sk_buff *skb, + unsigned long delay, + bool own_packet, + struct batadv_hard_iface *if_in, + struct batadv_hard_iface *if_out) +{ + struct batadv_forw_packet *forw_packet; + unsigned long send_time = jiffies; + struct sk_buff *newskb; + + newskb = skb_clone(skb, GFP_ATOMIC); + if (!newskb) + goto err; + + forw_packet = batadv_forw_packet_alloc(if_in, if_out, + &bat_priv->bcast_queue_left, + bat_priv, newskb); + if (!forw_packet) + goto err_packet_free; + + forw_packet->own = own_packet; + + INIT_DELAYED_WORK(&forw_packet->delayed_work, + batadv_send_outstanding_bcast_packet); + + send_time += delay ? delay : msecs_to_jiffies(5); + + batadv_forw_packet_bcast_queue(bat_priv, forw_packet, send_time); + return NETDEV_TX_OK; + +err_packet_free: + kfree_skb(newskb); +err: + return NETDEV_TX_BUSY; +} + +/** + * batadv_forw_bcast_packet_if() - forward and queue a broadcast packet + * @bat_priv: the bat priv with all the soft interface information + * @skb: broadcast packet to add + * @delay: number of jiffies to wait before sending + * @own_packet: true if it is a self-generated broadcast packet + * @if_in: the interface where the packet was received on + * @if_out: the outgoing interface to forward to + * + * Transmits a broadcast packet on the specified interface either immediately + * or if a delay is given after that. Furthermore, queues additional + * retransmissions if this interface is a wireless one. + * + * This call clones the given skb, hence the caller needs to take into + * account that the data segment of the original skb might not be + * modifiable anymore. + * + * Return: NETDEV_TX_OK on success and NETDEV_TX_BUSY on errors. + */ +static int batadv_forw_bcast_packet_if(struct batadv_priv *bat_priv, + struct sk_buff *skb, + unsigned long delay, + bool own_packet, + struct batadv_hard_iface *if_in, + struct batadv_hard_iface *if_out) +{ + unsigned int num_bcasts = if_out->num_bcasts; + struct sk_buff *newskb; + int ret = NETDEV_TX_OK; + + if (!delay) { + newskb = skb_clone(skb, GFP_ATOMIC); + if (!newskb) + return NETDEV_TX_BUSY; + + batadv_send_broadcast_skb(newskb, if_out); + num_bcasts--; + } + + /* delayed broadcast or rebroadcasts? */ + if (num_bcasts >= 1) { + BATADV_SKB_CB(skb)->num_bcasts = num_bcasts; + + ret = batadv_forw_bcast_packet_to_list(bat_priv, skb, delay, + own_packet, if_in, + if_out); + } + + return ret; +} + +/** + * batadv_send_no_broadcast() - check whether (re)broadcast is necessary + * @bat_priv: the bat priv with all the soft interface information + * @skb: broadcast packet to check + * @own_packet: true if it is a self-generated broadcast packet + * @if_out: the outgoing interface checked and considered for (re)broadcast + * + * Return: False if a packet needs to be (re)broadcasted on the given interface, + * true otherwise. + */ +static bool batadv_send_no_broadcast(struct batadv_priv *bat_priv, + struct sk_buff *skb, bool own_packet, + struct batadv_hard_iface *if_out) +{ + struct batadv_hardif_neigh_node *neigh_node = NULL; + struct batadv_bcast_packet *bcast_packet; + u8 *orig_neigh; + u8 *neigh_addr; + char *type; + int ret; + + if (!own_packet) { + neigh_addr = eth_hdr(skb)->h_source; + neigh_node = batadv_hardif_neigh_get(if_out, + neigh_addr); + } + + bcast_packet = (struct batadv_bcast_packet *)skb->data; + orig_neigh = neigh_node ? neigh_node->orig : NULL; + + ret = batadv_hardif_no_broadcast(if_out, bcast_packet->orig, + orig_neigh); + + batadv_hardif_neigh_put(neigh_node); + + /* ok, may broadcast */ + if (!ret) + return false; + + /* no broadcast */ + switch (ret) { + case BATADV_HARDIF_BCAST_NORECIPIENT: + type = "no neighbor"; + break; + case BATADV_HARDIF_BCAST_DUPFWD: + type = "single neighbor is source"; + break; + case BATADV_HARDIF_BCAST_DUPORIG: + type = "single neighbor is originator"; + break; + default: + type = "unknown"; + } + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "BCAST packet from orig %pM on %s suppressed: %s\n", + bcast_packet->orig, + if_out->net_dev->name, type); + + return true; +} + +/** + * __batadv_forw_bcast_packet() - forward and queue a broadcast packet + * @bat_priv: the bat priv with all the soft interface information + * @skb: broadcast packet to add + * @delay: number of jiffies to wait before sending + * @own_packet: true if it is a self-generated broadcast packet + * + * Transmits a broadcast packet either immediately or if a delay is given + * after that. Furthermore, queues additional retransmissions on wireless + * interfaces. + * + * This call clones the given skb, hence the caller needs to take into + * account that the data segment of the given skb might not be + * modifiable anymore. + * + * Return: NETDEV_TX_OK on success and NETDEV_TX_BUSY on errors. + */ +static int __batadv_forw_bcast_packet(struct batadv_priv *bat_priv, + struct sk_buff *skb, + unsigned long delay, + bool own_packet) +{ + struct batadv_hard_iface *hard_iface; + struct batadv_hard_iface *primary_if; + int ret = NETDEV_TX_OK; + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + return NETDEV_TX_BUSY; + + rcu_read_lock(); + list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { + if (hard_iface->soft_iface != bat_priv->soft_iface) + continue; + + if (!kref_get_unless_zero(&hard_iface->refcount)) + continue; + + if (batadv_send_no_broadcast(bat_priv, skb, own_packet, + hard_iface)) { + batadv_hardif_put(hard_iface); + continue; + } + + ret = batadv_forw_bcast_packet_if(bat_priv, skb, delay, + own_packet, primary_if, + hard_iface); + batadv_hardif_put(hard_iface); + + if (ret == NETDEV_TX_BUSY) + break; + } + rcu_read_unlock(); + + batadv_hardif_put(primary_if); + return ret; +} + +/** + * batadv_forw_bcast_packet() - forward and queue a broadcast packet + * @bat_priv: the bat priv with all the soft interface information + * @skb: broadcast packet to add + * @delay: number of jiffies to wait before sending + * @own_packet: true if it is a self-generated broadcast packet + * + * Transmits a broadcast packet either immediately or if a delay is given + * after that. Furthermore, queues additional retransmissions on wireless + * interfaces. + * + * Return: NETDEV_TX_OK on success and NETDEV_TX_BUSY on errors. + */ +int batadv_forw_bcast_packet(struct batadv_priv *bat_priv, + struct sk_buff *skb, + unsigned long delay, + bool own_packet) +{ + return __batadv_forw_bcast_packet(bat_priv, skb, delay, own_packet); +} + +/** + * batadv_send_bcast_packet() - send and queue a broadcast packet + * @bat_priv: the bat priv with all the soft interface information + * @skb: broadcast packet to add + * @delay: number of jiffies to wait before sending + * @own_packet: true if it is a self-generated broadcast packet + * + * Transmits a broadcast packet either immediately or if a delay is given + * after that. Furthermore, queues additional retransmissions on wireless + * interfaces. + * + * Consumes the provided skb. + */ +void batadv_send_bcast_packet(struct batadv_priv *bat_priv, + struct sk_buff *skb, + unsigned long delay, + bool own_packet) +{ + __batadv_forw_bcast_packet(bat_priv, skb, delay, own_packet); + consume_skb(skb); +} + +/** + * batadv_forw_packet_bcasts_left() - check if a retransmission is necessary + * @forw_packet: the forwarding packet to check + * + * Checks whether a given packet has any (re)transmissions left on the provided + * interface. + * + * hard_iface may be NULL: In that case the number of transmissions this skb had + * so far is compared with the maximum amount of retransmissions independent of + * any interface instead. + * + * Return: True if (re)transmissions are left, false otherwise. + */ +static bool +batadv_forw_packet_bcasts_left(struct batadv_forw_packet *forw_packet) +{ + return BATADV_SKB_CB(forw_packet->skb)->num_bcasts; +} + +/** + * batadv_forw_packet_bcasts_dec() - decrement retransmission counter of a + * packet + * @forw_packet: the packet to decrease the counter for + */ +static void +batadv_forw_packet_bcasts_dec(struct batadv_forw_packet *forw_packet) +{ + BATADV_SKB_CB(forw_packet->skb)->num_bcasts--; +} + +/** + * batadv_forw_packet_is_rebroadcast() - check packet for previous transmissions + * @forw_packet: the packet to check + * + * Return: True if this packet was transmitted before, false otherwise. + */ +bool batadv_forw_packet_is_rebroadcast(struct batadv_forw_packet *forw_packet) +{ + unsigned char num_bcasts = BATADV_SKB_CB(forw_packet->skb)->num_bcasts; + + return num_bcasts != forw_packet->if_outgoing->num_bcasts; +} + +/** + * batadv_send_outstanding_bcast_packet() - transmit a queued broadcast packet + * @work: work queue item + * + * Transmits a queued broadcast packet and if necessary reschedules it. + */ +static void batadv_send_outstanding_bcast_packet(struct work_struct *work) +{ + unsigned long send_time = jiffies + msecs_to_jiffies(5); + struct batadv_forw_packet *forw_packet; + struct delayed_work *delayed_work; + struct batadv_priv *bat_priv; + struct sk_buff *skb1; + bool dropped = false; + + delayed_work = to_delayed_work(work); + forw_packet = container_of(delayed_work, struct batadv_forw_packet, + delayed_work); + bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface); + + if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) { + dropped = true; + goto out; + } + + if (batadv_dat_drop_broadcast_packet(bat_priv, forw_packet)) { + dropped = true; + goto out; + } + + /* send a copy of the saved skb */ + skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC); + if (!skb1) + goto out; + + batadv_send_broadcast_skb(skb1, forw_packet->if_outgoing); + batadv_forw_packet_bcasts_dec(forw_packet); + + if (batadv_forw_packet_bcasts_left(forw_packet)) { + batadv_forw_packet_bcast_queue(bat_priv, forw_packet, + send_time); + return; + } + +out: + /* do we get something for free()? */ + if (batadv_forw_packet_steal(forw_packet, + &bat_priv->forw_bcast_list_lock)) + batadv_forw_packet_free(forw_packet, dropped); +} + +/** + * batadv_purge_outstanding_packets() - stop/purge scheduled bcast/OGMv1 packets + * @bat_priv: the bat priv with all the soft interface information + * @hard_iface: the hard interface to cancel and purge bcast/ogm packets on + * + * This method cancels and purges any broadcast and OGMv1 packet on the given + * hard_iface. If hard_iface is NULL, broadcast and OGMv1 packets on all hard + * interfaces will be canceled and purged. + * + * This function might sleep. + */ +void +batadv_purge_outstanding_packets(struct batadv_priv *bat_priv, + const struct batadv_hard_iface *hard_iface) +{ + struct hlist_head head = HLIST_HEAD_INIT; + + if (hard_iface) + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "%s(): %s\n", + __func__, hard_iface->net_dev->name); + else + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "%s()\n", __func__); + + /* claim bcast list for free() */ + spin_lock_bh(&bat_priv->forw_bcast_list_lock); + batadv_forw_packet_list_steal(&bat_priv->forw_bcast_list, &head, + hard_iface); + spin_unlock_bh(&bat_priv->forw_bcast_list_lock); + + /* claim batman packet list for free() */ + spin_lock_bh(&bat_priv->forw_bat_list_lock); + batadv_forw_packet_list_steal(&bat_priv->forw_bat_list, &head, + hard_iface); + spin_unlock_bh(&bat_priv->forw_bat_list_lock); + + /* then cancel or wait for packet workers to finish and free */ + batadv_forw_packet_list_free(&head); +} diff --git a/net/batman-adv/send.h b/net/batman-adv/send.h new file mode 100644 index 000000000..08af251b7 --- /dev/null +++ b/net/batman-adv/send.h @@ -0,0 +1,116 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + */ + +#ifndef _NET_BATMAN_ADV_SEND_H_ +#define _NET_BATMAN_ADV_SEND_H_ + +#include "main.h" + +#include <linux/compiler.h> +#include <linux/skbuff.h> +#include <linux/spinlock.h> +#include <linux/types.h> +#include <uapi/linux/batadv_packet.h> + +void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet, + bool dropped); +struct batadv_forw_packet * +batadv_forw_packet_alloc(struct batadv_hard_iface *if_incoming, + struct batadv_hard_iface *if_outgoing, + atomic_t *queue_left, + struct batadv_priv *bat_priv, + struct sk_buff *skb); +bool batadv_forw_packet_steal(struct batadv_forw_packet *packet, spinlock_t *l); +void batadv_forw_packet_ogmv1_queue(struct batadv_priv *bat_priv, + struct batadv_forw_packet *forw_packet, + unsigned long send_time); +bool batadv_forw_packet_is_rebroadcast(struct batadv_forw_packet *forw_packet); + +int batadv_send_skb_to_orig(struct sk_buff *skb, + struct batadv_orig_node *orig_node, + struct batadv_hard_iface *recv_if); +int batadv_send_skb_packet(struct sk_buff *skb, + struct batadv_hard_iface *hard_iface, + const u8 *dst_addr); +int batadv_send_broadcast_skb(struct sk_buff *skb, + struct batadv_hard_iface *hard_iface); +int batadv_send_unicast_skb(struct sk_buff *skb, + struct batadv_neigh_node *neigh_node); +int batadv_forw_bcast_packet(struct batadv_priv *bat_priv, + struct sk_buff *skb, + unsigned long delay, + bool own_packet); +void batadv_send_bcast_packet(struct batadv_priv *bat_priv, + struct sk_buff *skb, + unsigned long delay, + bool own_packet); +void +batadv_purge_outstanding_packets(struct batadv_priv *bat_priv, + const struct batadv_hard_iface *hard_iface); +bool batadv_send_skb_prepare_unicast_4addr(struct batadv_priv *bat_priv, + struct sk_buff *skb, + struct batadv_orig_node *orig_node, + int packet_subtype); +int batadv_send_skb_unicast(struct batadv_priv *bat_priv, + struct sk_buff *skb, int packet_type, + int packet_subtype, + struct batadv_orig_node *orig_node, + unsigned short vid); +int batadv_send_skb_via_tt_generic(struct batadv_priv *bat_priv, + struct sk_buff *skb, int packet_type, + int packet_subtype, u8 *dst_hint, + unsigned short vid); +int batadv_send_skb_via_gw(struct batadv_priv *bat_priv, struct sk_buff *skb, + unsigned short vid); + +/** + * batadv_send_skb_via_tt() - send an skb via TT lookup + * @bat_priv: the bat priv with all the soft interface information + * @skb: the payload to send + * @dst_hint: can be used to override the destination contained in the skb + * @vid: the vid to be used to search the translation table + * + * Look up the recipient node for the destination address in the ethernet + * header via the translation table. Wrap the given skb into a batman-adv + * unicast header. Then send this frame to the according destination node. + * + * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. + */ +static inline int batadv_send_skb_via_tt(struct batadv_priv *bat_priv, + struct sk_buff *skb, u8 *dst_hint, + unsigned short vid) +{ + return batadv_send_skb_via_tt_generic(bat_priv, skb, BATADV_UNICAST, 0, + dst_hint, vid); +} + +/** + * batadv_send_skb_via_tt_4addr() - send an skb via TT lookup + * @bat_priv: the bat priv with all the soft interface information + * @skb: the payload to send + * @packet_subtype: the unicast 4addr packet subtype to use + * @dst_hint: can be used to override the destination contained in the skb + * @vid: the vid to be used to search the translation table + * + * Look up the recipient node for the destination address in the ethernet + * header via the translation table. Wrap the given skb into a batman-adv + * unicast-4addr header. Then send this frame to the according destination + * node. + * + * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. + */ +static inline int batadv_send_skb_via_tt_4addr(struct batadv_priv *bat_priv, + struct sk_buff *skb, + int packet_subtype, + u8 *dst_hint, + unsigned short vid) +{ + return batadv_send_skb_via_tt_generic(bat_priv, skb, + BATADV_UNICAST_4ADDR, + packet_subtype, dst_hint, vid); +} + +#endif /* _NET_BATMAN_ADV_SEND_H_ */ diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c new file mode 100644 index 000000000..d7b525a49 --- /dev/null +++ b/net/batman-adv/soft-interface.c @@ -0,0 +1,1132 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + */ + +#include "soft-interface.h" +#include "main.h" + +#include <linux/atomic.h> +#include <linux/byteorder/generic.h> +#include <linux/cache.h> +#include <linux/compiler.h> +#include <linux/container_of.h> +#include <linux/cpumask.h> +#include <linux/errno.h> +#include <linux/etherdevice.h> +#include <linux/ethtool.h> +#include <linux/gfp.h> +#include <linux/if_ether.h> +#include <linux/if_vlan.h> +#include <linux/jiffies.h> +#include <linux/kref.h> +#include <linux/list.h> +#include <linux/lockdep.h> +#include <linux/netdevice.h> +#include <linux/netlink.h> +#include <linux/percpu.h> +#include <linux/random.h> +#include <linux/rculist.h> +#include <linux/rcupdate.h> +#include <linux/skbuff.h> +#include <linux/slab.h> +#include <linux/socket.h> +#include <linux/spinlock.h> +#include <linux/stddef.h> +#include <linux/string.h> +#include <linux/types.h> +#include <net/net_namespace.h> +#include <net/netlink.h> +#include <uapi/linux/batadv_packet.h> +#include <uapi/linux/batman_adv.h> + +#include "bat_algo.h" +#include "bridge_loop_avoidance.h" +#include "distributed-arp-table.h" +#include "gateway_client.h" +#include "hard-interface.h" +#include "multicast.h" +#include "network-coding.h" +#include "originator.h" +#include "send.h" +#include "translation-table.h" + +/** + * batadv_skb_head_push() - Increase header size and move (push) head pointer + * @skb: packet buffer which should be modified + * @len: number of bytes to add + * + * Return: 0 on success or negative error number in case of failure + */ +int batadv_skb_head_push(struct sk_buff *skb, unsigned int len) +{ + int result; + + /* TODO: We must check if we can release all references to non-payload + * data using __skb_header_release in our skbs to allow skb_cow_header + * to work optimally. This means that those skbs are not allowed to read + * or write any data which is before the current position of skb->data + * after that call and thus allow other skbs with the same data buffer + * to write freely in that area. + */ + result = skb_cow_head(skb, len); + if (result < 0) + return result; + + skb_push(skb, len); + return 0; +} + +static int batadv_interface_open(struct net_device *dev) +{ + netif_start_queue(dev); + return 0; +} + +static int batadv_interface_release(struct net_device *dev) +{ + netif_stop_queue(dev); + return 0; +} + +/** + * batadv_sum_counter() - Sum the cpu-local counters for index 'idx' + * @bat_priv: the bat priv with all the soft interface information + * @idx: index of counter to sum up + * + * Return: sum of all cpu-local counters + */ +static u64 batadv_sum_counter(struct batadv_priv *bat_priv, size_t idx) +{ + u64 *counters, sum = 0; + int cpu; + + for_each_possible_cpu(cpu) { + counters = per_cpu_ptr(bat_priv->bat_counters, cpu); + sum += counters[idx]; + } + + return sum; +} + +static struct net_device_stats *batadv_interface_stats(struct net_device *dev) +{ + struct batadv_priv *bat_priv = netdev_priv(dev); + struct net_device_stats *stats = &dev->stats; + + stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX); + stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES); + stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED); + stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX); + stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES); + return stats; +} + +static int batadv_interface_set_mac_addr(struct net_device *dev, void *p) +{ + struct batadv_priv *bat_priv = netdev_priv(dev); + struct batadv_softif_vlan *vlan; + struct sockaddr *addr = p; + u8 old_addr[ETH_ALEN]; + + if (!is_valid_ether_addr(addr->sa_data)) + return -EADDRNOTAVAIL; + + ether_addr_copy(old_addr, dev->dev_addr); + eth_hw_addr_set(dev, addr->sa_data); + + /* only modify transtable if it has been initialized before */ + if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) + return 0; + + rcu_read_lock(); + hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) { + batadv_tt_local_remove(bat_priv, old_addr, vlan->vid, + "mac address changed", false); + batadv_tt_local_add(dev, addr->sa_data, vlan->vid, + BATADV_NULL_IFINDEX, BATADV_NO_MARK); + } + rcu_read_unlock(); + + return 0; +} + +static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu) +{ + struct batadv_priv *bat_priv = netdev_priv(dev); + + /* check ranges */ + if (new_mtu < 68 || new_mtu > batadv_hardif_min_mtu(dev)) + return -EINVAL; + + dev->mtu = new_mtu; + bat_priv->mtu_set_by_user = new_mtu; + + return 0; +} + +/** + * batadv_interface_set_rx_mode() - set the rx mode of a device + * @dev: registered network device to modify + * + * We do not actually need to set any rx filters for the virtual batman + * soft interface. However a dummy handler enables a user to set static + * multicast listeners for instance. + */ +static void batadv_interface_set_rx_mode(struct net_device *dev) +{ +} + +static netdev_tx_t batadv_interface_tx(struct sk_buff *skb, + struct net_device *soft_iface) +{ + struct ethhdr *ethhdr; + struct batadv_priv *bat_priv = netdev_priv(soft_iface); + struct batadv_hard_iface *primary_if = NULL; + struct batadv_bcast_packet *bcast_packet; + static const u8 stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00, + 0x00, 0x00}; + static const u8 ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00, + 0x00, 0x00}; + enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO; + u8 *dst_hint = NULL, chaddr[ETH_ALEN]; + struct vlan_ethhdr *vhdr; + unsigned int header_len = 0; + int data_len = skb->len, ret; + unsigned long brd_delay = 0; + bool do_bcast = false, client_added; + unsigned short vid; + u32 seqno; + int gw_mode; + enum batadv_forw_mode forw_mode = BATADV_FORW_SINGLE; + struct batadv_orig_node *mcast_single_orig = NULL; + int mcast_is_routable = 0; + int network_offset = ETH_HLEN; + __be16 proto; + + if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) + goto dropped; + + /* reset control block to avoid left overs from previous users */ + memset(skb->cb, 0, sizeof(struct batadv_skb_cb)); + + netif_trans_update(soft_iface); + vid = batadv_get_vid(skb, 0); + + skb_reset_mac_header(skb); + ethhdr = eth_hdr(skb); + + proto = ethhdr->h_proto; + + switch (ntohs(proto)) { + case ETH_P_8021Q: + if (!pskb_may_pull(skb, sizeof(*vhdr))) + goto dropped; + vhdr = vlan_eth_hdr(skb); + proto = vhdr->h_vlan_encapsulated_proto; + + /* drop batman-in-batman packets to prevent loops */ + if (proto != htons(ETH_P_BATMAN)) { + network_offset += VLAN_HLEN; + break; + } + + fallthrough; + case ETH_P_BATMAN: + goto dropped; + } + + skb_set_network_header(skb, network_offset); + + if (batadv_bla_tx(bat_priv, skb, vid)) + goto dropped; + + /* skb->data might have been reallocated by batadv_bla_tx() */ + ethhdr = eth_hdr(skb); + + /* Register the client MAC in the transtable */ + if (!is_multicast_ether_addr(ethhdr->h_source) && + !batadv_bla_is_loopdetect_mac(ethhdr->h_source)) { + client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source, + vid, skb->skb_iif, + skb->mark); + if (!client_added) + goto dropped; + } + + /* Snoop address candidates from DHCPACKs for early DAT filling */ + batadv_dat_snoop_outgoing_dhcp_ack(bat_priv, skb, proto, vid); + + /* don't accept stp packets. STP does not help in meshes. + * better use the bridge loop avoidance ... + * + * The same goes for ECTP sent at least by some Cisco Switches, + * it might confuse the mesh when used with bridge loop avoidance. + */ + if (batadv_compare_eth(ethhdr->h_dest, stp_addr)) + goto dropped; + + if (batadv_compare_eth(ethhdr->h_dest, ectp_addr)) + goto dropped; + + gw_mode = atomic_read(&bat_priv->gw.mode); + if (is_multicast_ether_addr(ethhdr->h_dest)) { + /* if gw mode is off, broadcast every packet */ + if (gw_mode == BATADV_GW_MODE_OFF) { + do_bcast = true; + goto send; + } + + dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len, + chaddr); + /* skb->data may have been modified by + * batadv_gw_dhcp_recipient_get() + */ + ethhdr = eth_hdr(skb); + /* if gw_mode is on, broadcast any non-DHCP message. + * All the DHCP packets are going to be sent as unicast + */ + if (dhcp_rcp == BATADV_DHCP_NO) { + do_bcast = true; + goto send; + } + + if (dhcp_rcp == BATADV_DHCP_TO_CLIENT) + dst_hint = chaddr; + else if ((gw_mode == BATADV_GW_MODE_SERVER) && + (dhcp_rcp == BATADV_DHCP_TO_SERVER)) + /* gateways should not forward any DHCP message if + * directed to a DHCP server + */ + goto dropped; + +send: + if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) { + forw_mode = batadv_mcast_forw_mode(bat_priv, skb, + &mcast_single_orig, + &mcast_is_routable); + if (forw_mode == BATADV_FORW_NONE) + goto dropped; + + if (forw_mode == BATADV_FORW_SINGLE || + forw_mode == BATADV_FORW_SOME) + do_bcast = false; + } + } + + batadv_skb_set_priority(skb, 0); + + /* ethernet packet should be broadcasted */ + if (do_bcast) { + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + goto dropped; + + /* in case of ARP request, we do not immediately broadcasti the + * packet, instead we first wait for DAT to try to retrieve the + * correct ARP entry + */ + if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb)) + brd_delay = msecs_to_jiffies(ARP_REQ_DELAY); + + if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0) + goto dropped; + + bcast_packet = (struct batadv_bcast_packet *)skb->data; + bcast_packet->version = BATADV_COMPAT_VERSION; + bcast_packet->ttl = BATADV_TTL - 1; + + /* batman packet type: broadcast */ + bcast_packet->packet_type = BATADV_BCAST; + bcast_packet->reserved = 0; + + /* hw address of first interface is the orig mac because only + * this mac is known throughout the mesh + */ + ether_addr_copy(bcast_packet->orig, + primary_if->net_dev->dev_addr); + + /* set broadcast sequence number */ + seqno = atomic_inc_return(&bat_priv->bcast_seqno); + bcast_packet->seqno = htonl(seqno); + + batadv_send_bcast_packet(bat_priv, skb, brd_delay, true); + /* unicast packet */ + } else { + /* DHCP packets going to a server will use the GW feature */ + if (dhcp_rcp == BATADV_DHCP_TO_SERVER) { + ret = batadv_gw_out_of_range(bat_priv, skb); + if (ret) + goto dropped; + ret = batadv_send_skb_via_gw(bat_priv, skb, vid); + } else if (mcast_single_orig) { + ret = batadv_mcast_forw_send_orig(bat_priv, skb, vid, + mcast_single_orig); + } else if (forw_mode == BATADV_FORW_SOME) { + ret = batadv_mcast_forw_send(bat_priv, skb, vid, + mcast_is_routable); + } else { + if (batadv_dat_snoop_outgoing_arp_request(bat_priv, + skb)) + goto dropped; + + batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb); + + ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint, + vid); + } + if (ret != NET_XMIT_SUCCESS) + goto dropped_freed; + } + + batadv_inc_counter(bat_priv, BATADV_CNT_TX); + batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len); + goto end; + +dropped: + kfree_skb(skb); +dropped_freed: + batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED); +end: + batadv_orig_node_put(mcast_single_orig); + batadv_hardif_put(primary_if); + return NETDEV_TX_OK; +} + +/** + * batadv_interface_rx() - receive ethernet frame on local batman-adv interface + * @soft_iface: local interface which will receive the ethernet frame + * @skb: ethernet frame for @soft_iface + * @hdr_size: size of already parsed batman-adv header + * @orig_node: originator from which the batman-adv packet was sent + * + * Sends an ethernet frame to the receive path of the local @soft_iface. + * skb->data has still point to the batman-adv header with the size @hdr_size. + * The caller has to have parsed this header already and made sure that at least + * @hdr_size bytes are still available for pull in @skb. + * + * The packet may still get dropped. This can happen when the encapsulated + * ethernet frame is invalid or contains again an batman-adv packet. Also + * unicast packets will be dropped directly when it was sent between two + * isolated clients. + */ +void batadv_interface_rx(struct net_device *soft_iface, + struct sk_buff *skb, int hdr_size, + struct batadv_orig_node *orig_node) +{ + struct batadv_bcast_packet *batadv_bcast_packet; + struct batadv_priv *bat_priv = netdev_priv(soft_iface); + struct vlan_ethhdr *vhdr; + struct ethhdr *ethhdr; + unsigned short vid; + int packet_type; + + batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data; + packet_type = batadv_bcast_packet->packet_type; + + skb_pull_rcsum(skb, hdr_size); + skb_reset_mac_header(skb); + + /* clean the netfilter state now that the batman-adv header has been + * removed + */ + nf_reset_ct(skb); + + if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) + goto dropped; + + vid = batadv_get_vid(skb, 0); + ethhdr = eth_hdr(skb); + + switch (ntohs(ethhdr->h_proto)) { + case ETH_P_8021Q: + if (!pskb_may_pull(skb, VLAN_ETH_HLEN)) + goto dropped; + + vhdr = skb_vlan_eth_hdr(skb); + + /* drop batman-in-batman packets to prevent loops */ + if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN)) + break; + + fallthrough; + case ETH_P_BATMAN: + goto dropped; + } + + /* skb->dev & skb->pkt_type are set here */ + skb->protocol = eth_type_trans(skb, soft_iface); + skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); + + batadv_inc_counter(bat_priv, BATADV_CNT_RX); + batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, + skb->len + ETH_HLEN); + + /* Let the bridge loop avoidance check the packet. If will + * not handle it, we can safely push it up. + */ + if (batadv_bla_rx(bat_priv, skb, vid, packet_type)) + goto out; + + if (orig_node) + batadv_tt_add_temporary_global_entry(bat_priv, orig_node, + ethhdr->h_source, vid); + + if (is_multicast_ether_addr(ethhdr->h_dest)) { + /* set the mark on broadcast packets if AP isolation is ON and + * the packet is coming from an "isolated" client + */ + if (batadv_vlan_ap_isola_get(bat_priv, vid) && + batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source, + vid)) { + /* save bits in skb->mark not covered by the mask and + * apply the mark on the rest + */ + skb->mark &= ~bat_priv->isolation_mark_mask; + skb->mark |= bat_priv->isolation_mark; + } + } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source, + ethhdr->h_dest, vid)) { + goto dropped; + } + + netif_rx(skb); + goto out; + +dropped: + kfree_skb(skb); +out: + return; +} + +/** + * batadv_softif_vlan_release() - release vlan from lists and queue for free + * after rcu grace period + * @ref: kref pointer of the vlan object + */ +void batadv_softif_vlan_release(struct kref *ref) +{ + struct batadv_softif_vlan *vlan; + + vlan = container_of(ref, struct batadv_softif_vlan, refcount); + + spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock); + hlist_del_rcu(&vlan->list); + spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock); + + kfree_rcu(vlan, rcu); +} + +/** + * batadv_softif_vlan_get() - get the vlan object for a specific vid + * @bat_priv: the bat priv with all the soft interface information + * @vid: the identifier of the vlan object to retrieve + * + * Return: the private data of the vlan matching the vid passed as argument or + * NULL otherwise. The refcounter of the returned object is incremented by 1. + */ +struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv, + unsigned short vid) +{ + struct batadv_softif_vlan *vlan_tmp, *vlan = NULL; + + rcu_read_lock(); + hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) { + if (vlan_tmp->vid != vid) + continue; + + if (!kref_get_unless_zero(&vlan_tmp->refcount)) + continue; + + vlan = vlan_tmp; + break; + } + rcu_read_unlock(); + + return vlan; +} + +/** + * batadv_softif_create_vlan() - allocate the needed resources for a new vlan + * @bat_priv: the bat priv with all the soft interface information + * @vid: the VLAN identifier + * + * Return: 0 on success, a negative error otherwise. + */ +int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid) +{ + struct batadv_softif_vlan *vlan; + + spin_lock_bh(&bat_priv->softif_vlan_list_lock); + + vlan = batadv_softif_vlan_get(bat_priv, vid); + if (vlan) { + batadv_softif_vlan_put(vlan); + spin_unlock_bh(&bat_priv->softif_vlan_list_lock); + return -EEXIST; + } + + vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC); + if (!vlan) { + spin_unlock_bh(&bat_priv->softif_vlan_list_lock); + return -ENOMEM; + } + + vlan->bat_priv = bat_priv; + vlan->vid = vid; + kref_init(&vlan->refcount); + + atomic_set(&vlan->ap_isolation, 0); + + kref_get(&vlan->refcount); + hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list); + spin_unlock_bh(&bat_priv->softif_vlan_list_lock); + + /* add a new TT local entry. This one will be marked with the NOPURGE + * flag + */ + batadv_tt_local_add(bat_priv->soft_iface, + bat_priv->soft_iface->dev_addr, vid, + BATADV_NULL_IFINDEX, BATADV_NO_MARK); + + /* don't return reference to new softif_vlan */ + batadv_softif_vlan_put(vlan); + + return 0; +} + +/** + * batadv_softif_destroy_vlan() - remove and destroy a softif_vlan object + * @bat_priv: the bat priv with all the soft interface information + * @vlan: the object to remove + */ +static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv, + struct batadv_softif_vlan *vlan) +{ + /* explicitly remove the associated TT local entry because it is marked + * with the NOPURGE flag + */ + batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr, + vlan->vid, "vlan interface destroyed", false); + + batadv_softif_vlan_put(vlan); +} + +/** + * batadv_interface_add_vid() - ndo_add_vid API implementation + * @dev: the netdev of the mesh interface + * @proto: protocol of the vlan id + * @vid: identifier of the new vlan + * + * Set up all the internal structures for handling the new vlan on top of the + * mesh interface + * + * Return: 0 on success or a negative error code in case of failure. + */ +static int batadv_interface_add_vid(struct net_device *dev, __be16 proto, + unsigned short vid) +{ + struct batadv_priv *bat_priv = netdev_priv(dev); + struct batadv_softif_vlan *vlan; + + /* only 802.1Q vlans are supported. + * batman-adv does not know how to handle other types + */ + if (proto != htons(ETH_P_8021Q)) + return -EINVAL; + + vid |= BATADV_VLAN_HAS_TAG; + + /* if a new vlan is getting created and it already exists, it means that + * it was not deleted yet. batadv_softif_vlan_get() increases the + * refcount in order to revive the object. + * + * if it does not exist then create it. + */ + vlan = batadv_softif_vlan_get(bat_priv, vid); + if (!vlan) + return batadv_softif_create_vlan(bat_priv, vid); + + /* add a new TT local entry. This one will be marked with the NOPURGE + * flag. This must be added again, even if the vlan object already + * exists, because the entry was deleted by kill_vid() + */ + batadv_tt_local_add(bat_priv->soft_iface, + bat_priv->soft_iface->dev_addr, vid, + BATADV_NULL_IFINDEX, BATADV_NO_MARK); + + return 0; +} + +/** + * batadv_interface_kill_vid() - ndo_kill_vid API implementation + * @dev: the netdev of the mesh interface + * @proto: protocol of the vlan id + * @vid: identifier of the deleted vlan + * + * Destroy all the internal structures used to handle the vlan identified by vid + * on top of the mesh interface + * + * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q + * or -ENOENT if the specified vlan id wasn't registered. + */ +static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto, + unsigned short vid) +{ + struct batadv_priv *bat_priv = netdev_priv(dev); + struct batadv_softif_vlan *vlan; + + /* only 802.1Q vlans are supported. batman-adv does not know how to + * handle other types + */ + if (proto != htons(ETH_P_8021Q)) + return -EINVAL; + + vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG); + if (!vlan) + return -ENOENT; + + batadv_softif_destroy_vlan(bat_priv, vlan); + + /* finally free the vlan object */ + batadv_softif_vlan_put(vlan); + + return 0; +} + +/* batman-adv network devices have devices nesting below it and are a special + * "super class" of normal network devices; split their locks off into a + * separate class since they always nest. + */ +static struct lock_class_key batadv_netdev_xmit_lock_key; +static struct lock_class_key batadv_netdev_addr_lock_key; + +/** + * batadv_set_lockdep_class_one() - Set lockdep class for a single tx queue + * @dev: device which owns the tx queue + * @txq: tx queue to modify + * @_unused: always NULL + */ +static void batadv_set_lockdep_class_one(struct net_device *dev, + struct netdev_queue *txq, + void *_unused) +{ + lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key); +} + +/** + * batadv_set_lockdep_class() - Set txq and addr_list lockdep class + * @dev: network device to modify + */ +static void batadv_set_lockdep_class(struct net_device *dev) +{ + lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key); + netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL); +} + +/** + * batadv_softif_init_late() - late stage initialization of soft interface + * @dev: registered network device to modify + * + * Return: error code on failures + */ +static int batadv_softif_init_late(struct net_device *dev) +{ + struct batadv_priv *bat_priv; + u32 random_seqno; + int ret; + size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM; + + batadv_set_lockdep_class(dev); + + bat_priv = netdev_priv(dev); + bat_priv->soft_iface = dev; + + /* batadv_interface_stats() needs to be available as soon as + * register_netdevice() has been called + */ + bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64)); + if (!bat_priv->bat_counters) + return -ENOMEM; + + atomic_set(&bat_priv->aggregated_ogms, 1); + atomic_set(&bat_priv->bonding, 0); +#ifdef CONFIG_BATMAN_ADV_BLA + atomic_set(&bat_priv->bridge_loop_avoidance, 1); +#endif +#ifdef CONFIG_BATMAN_ADV_DAT + atomic_set(&bat_priv->distributed_arp_table, 1); +#endif +#ifdef CONFIG_BATMAN_ADV_MCAST + atomic_set(&bat_priv->multicast_mode, 1); + atomic_set(&bat_priv->multicast_fanout, 16); + atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0); + atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0); + atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0); +#endif + atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF); + atomic_set(&bat_priv->gw.bandwidth_down, 100); + atomic_set(&bat_priv->gw.bandwidth_up, 20); + atomic_set(&bat_priv->orig_interval, 1000); + atomic_set(&bat_priv->hop_penalty, 30); +#ifdef CONFIG_BATMAN_ADV_DEBUG + atomic_set(&bat_priv->log_level, 0); +#endif + atomic_set(&bat_priv->fragmentation, 1); + atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN); + atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN); + atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN); + + atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); + atomic_set(&bat_priv->bcast_seqno, 1); + atomic_set(&bat_priv->tt.vn, 0); + atomic_set(&bat_priv->tt.local_changes, 0); + atomic_set(&bat_priv->tt.ogm_append_cnt, 0); +#ifdef CONFIG_BATMAN_ADV_BLA + atomic_set(&bat_priv->bla.num_requests, 0); +#endif + atomic_set(&bat_priv->tp_num, 0); + + bat_priv->tt.last_changeset = NULL; + bat_priv->tt.last_changeset_len = 0; + bat_priv->isolation_mark = 0; + bat_priv->isolation_mark_mask = 0; + + /* randomize initial seqno to avoid collision */ + get_random_bytes(&random_seqno, sizeof(random_seqno)); + atomic_set(&bat_priv->frag_seqno, random_seqno); + + bat_priv->primary_if = NULL; + + batadv_nc_init_bat_priv(bat_priv); + + if (!bat_priv->algo_ops) { + ret = batadv_algo_select(bat_priv, batadv_routing_algo); + if (ret < 0) + goto free_bat_counters; + } + + ret = batadv_mesh_init(dev); + if (ret < 0) + goto free_bat_counters; + + return 0; + +free_bat_counters: + free_percpu(bat_priv->bat_counters); + bat_priv->bat_counters = NULL; + + return ret; +} + +/** + * batadv_softif_slave_add() - Add a slave interface to a batadv_soft_interface + * @dev: batadv_soft_interface used as master interface + * @slave_dev: net_device which should become the slave interface + * @extack: extended ACK report struct + * + * Return: 0 if successful or error otherwise. + */ +static int batadv_softif_slave_add(struct net_device *dev, + struct net_device *slave_dev, + struct netlink_ext_ack *extack) +{ + struct batadv_hard_iface *hard_iface; + int ret = -EINVAL; + + hard_iface = batadv_hardif_get_by_netdev(slave_dev); + if (!hard_iface || hard_iface->soft_iface) + goto out; + + ret = batadv_hardif_enable_interface(hard_iface, dev); + +out: + batadv_hardif_put(hard_iface); + return ret; +} + +/** + * batadv_softif_slave_del() - Delete a slave iface from a batadv_soft_interface + * @dev: batadv_soft_interface used as master interface + * @slave_dev: net_device which should be removed from the master interface + * + * Return: 0 if successful or error otherwise. + */ +static int batadv_softif_slave_del(struct net_device *dev, + struct net_device *slave_dev) +{ + struct batadv_hard_iface *hard_iface; + int ret = -EINVAL; + + hard_iface = batadv_hardif_get_by_netdev(slave_dev); + + if (!hard_iface || hard_iface->soft_iface != dev) + goto out; + + batadv_hardif_disable_interface(hard_iface); + ret = 0; + +out: + batadv_hardif_put(hard_iface); + return ret; +} + +static const struct net_device_ops batadv_netdev_ops = { + .ndo_init = batadv_softif_init_late, + .ndo_open = batadv_interface_open, + .ndo_stop = batadv_interface_release, + .ndo_get_stats = batadv_interface_stats, + .ndo_vlan_rx_add_vid = batadv_interface_add_vid, + .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid, + .ndo_set_mac_address = batadv_interface_set_mac_addr, + .ndo_change_mtu = batadv_interface_change_mtu, + .ndo_set_rx_mode = batadv_interface_set_rx_mode, + .ndo_start_xmit = batadv_interface_tx, + .ndo_validate_addr = eth_validate_addr, + .ndo_add_slave = batadv_softif_slave_add, + .ndo_del_slave = batadv_softif_slave_del, +}; + +static void batadv_get_drvinfo(struct net_device *dev, + struct ethtool_drvinfo *info) +{ + strscpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver)); + strscpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version)); + strscpy(info->fw_version, "N/A", sizeof(info->fw_version)); + strscpy(info->bus_info, "batman", sizeof(info->bus_info)); +} + +/* Inspired by drivers/net/ethernet/dlink/sundance.c:1702 + * Declare each description string in struct.name[] to get fixed sized buffer + * and compile time checking for strings longer than ETH_GSTRING_LEN. + */ +static const struct { + const char name[ETH_GSTRING_LEN]; +} batadv_counters_strings[] = { + { "tx" }, + { "tx_bytes" }, + { "tx_dropped" }, + { "rx" }, + { "rx_bytes" }, + { "forward" }, + { "forward_bytes" }, + { "mgmt_tx" }, + { "mgmt_tx_bytes" }, + { "mgmt_rx" }, + { "mgmt_rx_bytes" }, + { "frag_tx" }, + { "frag_tx_bytes" }, + { "frag_rx" }, + { "frag_rx_bytes" }, + { "frag_fwd" }, + { "frag_fwd_bytes" }, + { "tt_request_tx" }, + { "tt_request_rx" }, + { "tt_response_tx" }, + { "tt_response_rx" }, + { "tt_roam_adv_tx" }, + { "tt_roam_adv_rx" }, +#ifdef CONFIG_BATMAN_ADV_DAT + { "dat_get_tx" }, + { "dat_get_rx" }, + { "dat_put_tx" }, + { "dat_put_rx" }, + { "dat_cached_reply_tx" }, +#endif +#ifdef CONFIG_BATMAN_ADV_NC + { "nc_code" }, + { "nc_code_bytes" }, + { "nc_recode" }, + { "nc_recode_bytes" }, + { "nc_buffer" }, + { "nc_decode" }, + { "nc_decode_bytes" }, + { "nc_decode_failed" }, + { "nc_sniffed" }, +#endif +}; + +static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data) +{ + if (stringset == ETH_SS_STATS) + memcpy(data, batadv_counters_strings, + sizeof(batadv_counters_strings)); +} + +static void batadv_get_ethtool_stats(struct net_device *dev, + struct ethtool_stats *stats, u64 *data) +{ + struct batadv_priv *bat_priv = netdev_priv(dev); + int i; + + for (i = 0; i < BATADV_CNT_NUM; i++) + data[i] = batadv_sum_counter(bat_priv, i); +} + +static int batadv_get_sset_count(struct net_device *dev, int stringset) +{ + if (stringset == ETH_SS_STATS) + return BATADV_CNT_NUM; + + return -EOPNOTSUPP; +} + +static const struct ethtool_ops batadv_ethtool_ops = { + .get_drvinfo = batadv_get_drvinfo, + .get_link = ethtool_op_get_link, + .get_strings = batadv_get_strings, + .get_ethtool_stats = batadv_get_ethtool_stats, + .get_sset_count = batadv_get_sset_count, +}; + +/** + * batadv_softif_free() - Deconstructor of batadv_soft_interface + * @dev: Device to cleanup and remove + */ +static void batadv_softif_free(struct net_device *dev) +{ + batadv_mesh_free(dev); + + /* some scheduled RCU callbacks need the bat_priv struct to accomplish + * their tasks. Wait for them all to be finished before freeing the + * netdev and its private data (bat_priv) + */ + rcu_barrier(); +} + +/** + * batadv_softif_init_early() - early stage initialization of soft interface + * @dev: registered network device to modify + */ +static void batadv_softif_init_early(struct net_device *dev) +{ + ether_setup(dev); + + dev->netdev_ops = &batadv_netdev_ops; + dev->needs_free_netdev = true; + dev->priv_destructor = batadv_softif_free; + dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL; + dev->features |= NETIF_F_LLTX; + dev->priv_flags |= IFF_NO_QUEUE; + + /* can't call min_mtu, because the needed variables + * have not been initialized yet + */ + dev->mtu = ETH_DATA_LEN; + + /* generate random address */ + eth_hw_addr_random(dev); + + dev->ethtool_ops = &batadv_ethtool_ops; +} + +/** + * batadv_softif_validate() - validate configuration of new batadv link + * @tb: IFLA_INFO_DATA netlink attributes + * @data: enum batadv_ifla_attrs attributes + * @extack: extended ACK report struct + * + * Return: 0 if successful or error otherwise. + */ +static int batadv_softif_validate(struct nlattr *tb[], struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + struct batadv_algo_ops *algo_ops; + + if (!data) + return 0; + + if (data[IFLA_BATADV_ALGO_NAME]) { + algo_ops = batadv_algo_get(nla_data(data[IFLA_BATADV_ALGO_NAME])); + if (!algo_ops) + return -EINVAL; + } + + return 0; +} + +/** + * batadv_softif_newlink() - pre-initialize and register new batadv link + * @src_net: the applicable net namespace + * @dev: network device to register + * @tb: IFLA_INFO_DATA netlink attributes + * @data: enum batadv_ifla_attrs attributes + * @extack: extended ACK report struct + * + * Return: 0 if successful or error otherwise. + */ +static int batadv_softif_newlink(struct net *src_net, struct net_device *dev, + struct nlattr *tb[], struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + struct batadv_priv *bat_priv = netdev_priv(dev); + const char *algo_name; + int err; + + if (data && data[IFLA_BATADV_ALGO_NAME]) { + algo_name = nla_data(data[IFLA_BATADV_ALGO_NAME]); + err = batadv_algo_select(bat_priv, algo_name); + if (err) + return -EINVAL; + } + + return register_netdevice(dev); +} + +/** + * batadv_softif_destroy_netlink() - deletion of batadv_soft_interface via + * netlink + * @soft_iface: the to-be-removed batman-adv interface + * @head: list pointer + */ +static void batadv_softif_destroy_netlink(struct net_device *soft_iface, + struct list_head *head) +{ + struct batadv_priv *bat_priv = netdev_priv(soft_iface); + struct batadv_hard_iface *hard_iface; + struct batadv_softif_vlan *vlan; + + list_for_each_entry(hard_iface, &batadv_hardif_list, list) { + if (hard_iface->soft_iface == soft_iface) + batadv_hardif_disable_interface(hard_iface); + } + + /* destroy the "untagged" VLAN */ + vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); + if (vlan) { + batadv_softif_destroy_vlan(bat_priv, vlan); + batadv_softif_vlan_put(vlan); + } + + unregister_netdevice_queue(soft_iface, head); +} + +/** + * batadv_softif_is_valid() - Check whether device is a batadv soft interface + * @net_dev: device which should be checked + * + * Return: true when net_dev is a batman-adv interface, false otherwise + */ +bool batadv_softif_is_valid(const struct net_device *net_dev) +{ + if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx) + return true; + + return false; +} + +static const struct nla_policy batadv_ifla_policy[IFLA_BATADV_MAX + 1] = { + [IFLA_BATADV_ALGO_NAME] = { .type = NLA_NUL_STRING }, +}; + +struct rtnl_link_ops batadv_link_ops __read_mostly = { + .kind = "batadv", + .priv_size = sizeof(struct batadv_priv), + .setup = batadv_softif_init_early, + .maxtype = IFLA_BATADV_MAX, + .policy = batadv_ifla_policy, + .validate = batadv_softif_validate, + .newlink = batadv_softif_newlink, + .dellink = batadv_softif_destroy_netlink, +}; diff --git a/net/batman-adv/soft-interface.h b/net/batman-adv/soft-interface.h new file mode 100644 index 000000000..9f2003f1a --- /dev/null +++ b/net/batman-adv/soft-interface.h @@ -0,0 +1,42 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner + */ + +#ifndef _NET_BATMAN_ADV_SOFT_INTERFACE_H_ +#define _NET_BATMAN_ADV_SOFT_INTERFACE_H_ + +#include "main.h" + +#include <linux/kref.h> +#include <linux/netdevice.h> +#include <linux/skbuff.h> +#include <linux/types.h> +#include <net/rtnetlink.h> + +int batadv_skb_head_push(struct sk_buff *skb, unsigned int len); +void batadv_interface_rx(struct net_device *soft_iface, + struct sk_buff *skb, int hdr_size, + struct batadv_orig_node *orig_node); +bool batadv_softif_is_valid(const struct net_device *net_dev); +extern struct rtnl_link_ops batadv_link_ops; +int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid); +void batadv_softif_vlan_release(struct kref *ref); +struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv, + unsigned short vid); + +/** + * batadv_softif_vlan_put() - decrease the vlan object refcounter and + * possibly release it + * @vlan: the vlan object to release + */ +static inline void batadv_softif_vlan_put(struct batadv_softif_vlan *vlan) +{ + if (!vlan) + return; + + kref_put(&vlan->refcount, batadv_softif_vlan_release); +} + +#endif /* _NET_BATMAN_ADV_SOFT_INTERFACE_H_ */ diff --git a/net/batman-adv/tp_meter.c b/net/batman-adv/tp_meter.c new file mode 100644 index 000000000..7f3dd3c39 --- /dev/null +++ b/net/batman-adv/tp_meter.c @@ -0,0 +1,1490 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Edo Monticelli, Antonio Quartulli + */ + +#include "tp_meter.h" +#include "main.h" + +#include <linux/atomic.h> +#include <linux/build_bug.h> +#include <linux/byteorder/generic.h> +#include <linux/cache.h> +#include <linux/compiler.h> +#include <linux/container_of.h> +#include <linux/err.h> +#include <linux/etherdevice.h> +#include <linux/gfp.h> +#include <linux/if_ether.h> +#include <linux/init.h> +#include <linux/jiffies.h> +#include <linux/kref.h> +#include <linux/kthread.h> +#include <linux/limits.h> +#include <linux/list.h> +#include <linux/minmax.h> +#include <linux/netdevice.h> +#include <linux/param.h> +#include <linux/printk.h> +#include <linux/random.h> +#include <linux/rculist.h> +#include <linux/rcupdate.h> +#include <linux/sched.h> +#include <linux/skbuff.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/stddef.h> +#include <linux/string.h> +#include <linux/timer.h> +#include <linux/wait.h> +#include <linux/workqueue.h> +#include <uapi/linux/batadv_packet.h> +#include <uapi/linux/batman_adv.h> + +#include "hard-interface.h" +#include "log.h" +#include "netlink.h" +#include "originator.h" +#include "send.h" + +/** + * BATADV_TP_DEF_TEST_LENGTH - Default test length if not specified by the user + * in milliseconds + */ +#define BATADV_TP_DEF_TEST_LENGTH 10000 + +/** + * BATADV_TP_AWND - Advertised window by the receiver (in bytes) + */ +#define BATADV_TP_AWND 0x20000000 + +/** + * BATADV_TP_RECV_TIMEOUT - Receiver activity timeout. If the receiver does not + * get anything for such amount of milliseconds, the connection is killed + */ +#define BATADV_TP_RECV_TIMEOUT 1000 + +/** + * BATADV_TP_MAX_RTO - Maximum sender timeout. If the sender RTO gets beyond + * such amount of milliseconds, the receiver is considered unreachable and the + * connection is killed + */ +#define BATADV_TP_MAX_RTO 30000 + +/** + * BATADV_TP_FIRST_SEQ - First seqno of each session. The number is rather high + * in order to immediately trigger a wrap around (test purposes) + */ +#define BATADV_TP_FIRST_SEQ ((u32)-1 - 2000) + +/** + * BATADV_TP_PLEN - length of the payload (data after the batadv_unicast header) + * to simulate + */ +#define BATADV_TP_PLEN (BATADV_TP_PACKET_LEN - ETH_HLEN - \ + sizeof(struct batadv_unicast_packet)) + +static u8 batadv_tp_prerandom[4096] __read_mostly; + +/** + * batadv_tp_session_cookie() - generate session cookie based on session ids + * @session: TP session identifier + * @icmp_uid: icmp pseudo uid of the tp session + * + * Return: 32 bit tp_meter session cookie + */ +static u32 batadv_tp_session_cookie(const u8 session[2], u8 icmp_uid) +{ + u32 cookie; + + cookie = icmp_uid << 16; + cookie |= session[0] << 8; + cookie |= session[1]; + + return cookie; +} + +/** + * batadv_tp_cwnd() - compute the new cwnd size + * @base: base cwnd size value + * @increment: the value to add to base to get the new size + * @min: minimum cwnd value (usually MSS) + * + * Return the new cwnd size and ensure it does not exceed the Advertised + * Receiver Window size. It is wrapped around safely. + * For details refer to Section 3.1 of RFC5681 + * + * Return: new congestion window size in bytes + */ +static u32 batadv_tp_cwnd(u32 base, u32 increment, u32 min) +{ + u32 new_size = base + increment; + + /* check for wrap-around */ + if (new_size < base) + new_size = (u32)ULONG_MAX; + + new_size = min_t(u32, new_size, BATADV_TP_AWND); + + return max_t(u32, new_size, min); +} + +/** + * batadv_tp_update_cwnd() - update the Congestion Windows + * @tp_vars: the private data of the current TP meter session + * @mss: maximum segment size of transmission + * + * 1) if the session is in Slow Start, the CWND has to be increased by 1 + * MSS every unique received ACK + * 2) if the session is in Congestion Avoidance, the CWND has to be + * increased by MSS * MSS / CWND for every unique received ACK + */ +static void batadv_tp_update_cwnd(struct batadv_tp_vars *tp_vars, u32 mss) +{ + spin_lock_bh(&tp_vars->cwnd_lock); + + /* slow start... */ + if (tp_vars->cwnd <= tp_vars->ss_threshold) { + tp_vars->dec_cwnd = 0; + tp_vars->cwnd = batadv_tp_cwnd(tp_vars->cwnd, mss, mss); + spin_unlock_bh(&tp_vars->cwnd_lock); + return; + } + + /* increment CWND at least of 1 (section 3.1 of RFC5681) */ + tp_vars->dec_cwnd += max_t(u32, 1U << 3, + ((mss * mss) << 6) / (tp_vars->cwnd << 3)); + if (tp_vars->dec_cwnd < (mss << 3)) { + spin_unlock_bh(&tp_vars->cwnd_lock); + return; + } + + tp_vars->cwnd = batadv_tp_cwnd(tp_vars->cwnd, mss, mss); + tp_vars->dec_cwnd = 0; + + spin_unlock_bh(&tp_vars->cwnd_lock); +} + +/** + * batadv_tp_update_rto() - calculate new retransmission timeout + * @tp_vars: the private data of the current TP meter session + * @new_rtt: new roundtrip time in msec + */ +static void batadv_tp_update_rto(struct batadv_tp_vars *tp_vars, + u32 new_rtt) +{ + long m = new_rtt; + + /* RTT update + * Details in Section 2.2 and 2.3 of RFC6298 + * + * It's tricky to understand. Don't lose hair please. + * Inspired by tcp_rtt_estimator() tcp_input.c + */ + if (tp_vars->srtt != 0) { + m -= (tp_vars->srtt >> 3); /* m is now error in rtt est */ + tp_vars->srtt += m; /* rtt = 7/8 srtt + 1/8 new */ + if (m < 0) + m = -m; + + m -= (tp_vars->rttvar >> 2); + tp_vars->rttvar += m; /* mdev ~= 3/4 rttvar + 1/4 new */ + } else { + /* first measure getting in */ + tp_vars->srtt = m << 3; /* take the measured time to be srtt */ + tp_vars->rttvar = m << 1; /* new_rtt / 2 */ + } + + /* rto = srtt + 4 * rttvar. + * rttvar is scaled by 4, therefore doesn't need to be multiplied + */ + tp_vars->rto = (tp_vars->srtt >> 3) + tp_vars->rttvar; +} + +/** + * batadv_tp_batctl_notify() - send client status result to client + * @reason: reason for tp meter session stop + * @dst: destination of tp_meter session + * @bat_priv: the bat priv with all the soft interface information + * @start_time: start of transmission in jiffies + * @total_sent: bytes acked to the receiver + * @cookie: cookie of tp_meter session + */ +static void batadv_tp_batctl_notify(enum batadv_tp_meter_reason reason, + const u8 *dst, struct batadv_priv *bat_priv, + unsigned long start_time, u64 total_sent, + u32 cookie) +{ + u32 test_time; + u8 result; + u32 total_bytes; + + if (!batadv_tp_is_error(reason)) { + result = BATADV_TP_REASON_COMPLETE; + test_time = jiffies_to_msecs(jiffies - start_time); + total_bytes = total_sent; + } else { + result = reason; + test_time = 0; + total_bytes = 0; + } + + batadv_netlink_tpmeter_notify(bat_priv, dst, result, test_time, + total_bytes, cookie); +} + +/** + * batadv_tp_batctl_error_notify() - send client error result to client + * @reason: reason for tp meter session stop + * @dst: destination of tp_meter session + * @bat_priv: the bat priv with all the soft interface information + * @cookie: cookie of tp_meter session + */ +static void batadv_tp_batctl_error_notify(enum batadv_tp_meter_reason reason, + const u8 *dst, + struct batadv_priv *bat_priv, + u32 cookie) +{ + batadv_tp_batctl_notify(reason, dst, bat_priv, 0, 0, cookie); +} + +/** + * batadv_tp_list_find() - find a tp_vars object in the global list + * @bat_priv: the bat priv with all the soft interface information + * @dst: the other endpoint MAC address to look for + * + * Look for a tp_vars object matching dst as end_point and return it after + * having increment the refcounter. Return NULL is not found + * + * Return: matching tp_vars or NULL when no tp_vars with @dst was found + */ +static struct batadv_tp_vars *batadv_tp_list_find(struct batadv_priv *bat_priv, + const u8 *dst) +{ + struct batadv_tp_vars *pos, *tp_vars = NULL; + + rcu_read_lock(); + hlist_for_each_entry_rcu(pos, &bat_priv->tp_list, list) { + if (!batadv_compare_eth(pos->other_end, dst)) + continue; + + /* most of the time this function is invoked during the normal + * process..it makes sens to pay more when the session is + * finished and to speed the process up during the measurement + */ + if (unlikely(!kref_get_unless_zero(&pos->refcount))) + continue; + + tp_vars = pos; + break; + } + rcu_read_unlock(); + + return tp_vars; +} + +/** + * batadv_tp_list_find_session() - find tp_vars session object in the global + * list + * @bat_priv: the bat priv with all the soft interface information + * @dst: the other endpoint MAC address to look for + * @session: session identifier + * + * Look for a tp_vars object matching dst as end_point, session as tp meter + * session and return it after having increment the refcounter. Return NULL + * is not found + * + * Return: matching tp_vars or NULL when no tp_vars was found + */ +static struct batadv_tp_vars * +batadv_tp_list_find_session(struct batadv_priv *bat_priv, const u8 *dst, + const u8 *session) +{ + struct batadv_tp_vars *pos, *tp_vars = NULL; + + rcu_read_lock(); + hlist_for_each_entry_rcu(pos, &bat_priv->tp_list, list) { + if (!batadv_compare_eth(pos->other_end, dst)) + continue; + + if (memcmp(pos->session, session, sizeof(pos->session)) != 0) + continue; + + /* most of the time this function is invoked during the normal + * process..it makes sense to pay more when the session is + * finished and to speed the process up during the measurement + */ + if (unlikely(!kref_get_unless_zero(&pos->refcount))) + continue; + + tp_vars = pos; + break; + } + rcu_read_unlock(); + + return tp_vars; +} + +/** + * batadv_tp_vars_release() - release batadv_tp_vars from lists and queue for + * free after rcu grace period + * @ref: kref pointer of the batadv_tp_vars + */ +static void batadv_tp_vars_release(struct kref *ref) +{ + struct batadv_tp_vars *tp_vars; + struct batadv_tp_unacked *un, *safe; + + tp_vars = container_of(ref, struct batadv_tp_vars, refcount); + + /* lock should not be needed because this object is now out of any + * context! + */ + spin_lock_bh(&tp_vars->unacked_lock); + list_for_each_entry_safe(un, safe, &tp_vars->unacked_list, list) { + list_del(&un->list); + kfree(un); + } + spin_unlock_bh(&tp_vars->unacked_lock); + + kfree_rcu(tp_vars, rcu); +} + +/** + * batadv_tp_vars_put() - decrement the batadv_tp_vars refcounter and possibly + * release it + * @tp_vars: the private data of the current TP meter session to be free'd + */ +static void batadv_tp_vars_put(struct batadv_tp_vars *tp_vars) +{ + if (!tp_vars) + return; + + kref_put(&tp_vars->refcount, batadv_tp_vars_release); +} + +/** + * batadv_tp_sender_cleanup() - cleanup sender data and drop and timer + * @bat_priv: the bat priv with all the soft interface information + * @tp_vars: the private data of the current TP meter session to cleanup + */ +static void batadv_tp_sender_cleanup(struct batadv_priv *bat_priv, + struct batadv_tp_vars *tp_vars) +{ + cancel_delayed_work(&tp_vars->finish_work); + + spin_lock_bh(&tp_vars->bat_priv->tp_list_lock); + hlist_del_rcu(&tp_vars->list); + spin_unlock_bh(&tp_vars->bat_priv->tp_list_lock); + + /* drop list reference */ + batadv_tp_vars_put(tp_vars); + + atomic_dec(&tp_vars->bat_priv->tp_num); + + /* kill the timer and remove its reference */ + del_timer_sync(&tp_vars->timer); + /* the worker might have rearmed itself therefore we kill it again. Note + * that if the worker should run again before invoking the following + * del_timer(), it would not re-arm itself once again because the status + * is OFF now + */ + del_timer(&tp_vars->timer); + batadv_tp_vars_put(tp_vars); +} + +/** + * batadv_tp_sender_end() - print info about ended session and inform client + * @bat_priv: the bat priv with all the soft interface information + * @tp_vars: the private data of the current TP meter session + */ +static void batadv_tp_sender_end(struct batadv_priv *bat_priv, + struct batadv_tp_vars *tp_vars) +{ + u32 session_cookie; + + batadv_dbg(BATADV_DBG_TP_METER, bat_priv, + "Test towards %pM finished..shutting down (reason=%d)\n", + tp_vars->other_end, tp_vars->reason); + + batadv_dbg(BATADV_DBG_TP_METER, bat_priv, + "Last timing stats: SRTT=%ums RTTVAR=%ums RTO=%ums\n", + tp_vars->srtt >> 3, tp_vars->rttvar >> 2, tp_vars->rto); + + batadv_dbg(BATADV_DBG_TP_METER, bat_priv, + "Final values: cwnd=%u ss_threshold=%u\n", + tp_vars->cwnd, tp_vars->ss_threshold); + + session_cookie = batadv_tp_session_cookie(tp_vars->session, + tp_vars->icmp_uid); + + batadv_tp_batctl_notify(tp_vars->reason, + tp_vars->other_end, + bat_priv, + tp_vars->start_time, + atomic64_read(&tp_vars->tot_sent), + session_cookie); +} + +/** + * batadv_tp_sender_shutdown() - let sender thread/timer stop gracefully + * @tp_vars: the private data of the current TP meter session + * @reason: reason for tp meter session stop + */ +static void batadv_tp_sender_shutdown(struct batadv_tp_vars *tp_vars, + enum batadv_tp_meter_reason reason) +{ + if (!atomic_dec_and_test(&tp_vars->sending)) + return; + + tp_vars->reason = reason; +} + +/** + * batadv_tp_sender_finish() - stop sender session after test_length was reached + * @work: delayed work reference of the related tp_vars + */ +static void batadv_tp_sender_finish(struct work_struct *work) +{ + struct delayed_work *delayed_work; + struct batadv_tp_vars *tp_vars; + + delayed_work = to_delayed_work(work); + tp_vars = container_of(delayed_work, struct batadv_tp_vars, + finish_work); + + batadv_tp_sender_shutdown(tp_vars, BATADV_TP_REASON_COMPLETE); +} + +/** + * batadv_tp_reset_sender_timer() - reschedule the sender timer + * @tp_vars: the private TP meter data for this session + * + * Reschedule the timer using tp_vars->rto as delay + */ +static void batadv_tp_reset_sender_timer(struct batadv_tp_vars *tp_vars) +{ + /* most of the time this function is invoked while normal packet + * reception... + */ + if (unlikely(atomic_read(&tp_vars->sending) == 0)) + /* timer ref will be dropped in batadv_tp_sender_cleanup */ + return; + + mod_timer(&tp_vars->timer, jiffies + msecs_to_jiffies(tp_vars->rto)); +} + +/** + * batadv_tp_sender_timeout() - timer that fires in case of packet loss + * @t: address to timer_list inside tp_vars + * + * If fired it means that there was packet loss. + * Switch to Slow Start, set the ss_threshold to half of the current cwnd and + * reset the cwnd to 3*MSS + */ +static void batadv_tp_sender_timeout(struct timer_list *t) +{ + struct batadv_tp_vars *tp_vars = from_timer(tp_vars, t, timer); + struct batadv_priv *bat_priv = tp_vars->bat_priv; + + if (atomic_read(&tp_vars->sending) == 0) + return; + + /* if the user waited long enough...shutdown the test */ + if (unlikely(tp_vars->rto >= BATADV_TP_MAX_RTO)) { + batadv_tp_sender_shutdown(tp_vars, + BATADV_TP_REASON_DST_UNREACHABLE); + return; + } + + /* RTO exponential backoff + * Details in Section 5.5 of RFC6298 + */ + tp_vars->rto <<= 1; + + spin_lock_bh(&tp_vars->cwnd_lock); + + tp_vars->ss_threshold = tp_vars->cwnd >> 1; + if (tp_vars->ss_threshold < BATADV_TP_PLEN * 2) + tp_vars->ss_threshold = BATADV_TP_PLEN * 2; + + batadv_dbg(BATADV_DBG_TP_METER, bat_priv, + "Meter: RTO fired during test towards %pM! cwnd=%u new ss_thr=%u, resetting last_sent to %u\n", + tp_vars->other_end, tp_vars->cwnd, tp_vars->ss_threshold, + atomic_read(&tp_vars->last_acked)); + + tp_vars->cwnd = BATADV_TP_PLEN * 3; + + spin_unlock_bh(&tp_vars->cwnd_lock); + + /* resend the non-ACKed packets.. */ + tp_vars->last_sent = atomic_read(&tp_vars->last_acked); + wake_up(&tp_vars->more_bytes); + + batadv_tp_reset_sender_timer(tp_vars); +} + +/** + * batadv_tp_fill_prerandom() - Fill buffer with prefetched random bytes + * @tp_vars: the private TP meter data for this session + * @buf: Buffer to fill with bytes + * @nbytes: amount of pseudorandom bytes + */ +static void batadv_tp_fill_prerandom(struct batadv_tp_vars *tp_vars, + u8 *buf, size_t nbytes) +{ + u32 local_offset; + size_t bytes_inbuf; + size_t to_copy; + size_t pos = 0; + + spin_lock_bh(&tp_vars->prerandom_lock); + local_offset = tp_vars->prerandom_offset; + tp_vars->prerandom_offset += nbytes; + tp_vars->prerandom_offset %= sizeof(batadv_tp_prerandom); + spin_unlock_bh(&tp_vars->prerandom_lock); + + while (nbytes) { + local_offset %= sizeof(batadv_tp_prerandom); + bytes_inbuf = sizeof(batadv_tp_prerandom) - local_offset; + to_copy = min(nbytes, bytes_inbuf); + + memcpy(&buf[pos], &batadv_tp_prerandom[local_offset], to_copy); + pos += to_copy; + nbytes -= to_copy; + local_offset = 0; + } +} + +/** + * batadv_tp_send_msg() - send a single message + * @tp_vars: the private TP meter data for this session + * @src: source mac address + * @orig_node: the originator of the destination + * @seqno: sequence number of this packet + * @len: length of the entire packet + * @session: session identifier + * @uid: local ICMP "socket" index + * @timestamp: timestamp in jiffies which is replied in ack + * + * Create and send a single TP Meter message. + * + * Return: 0 on success, BATADV_TP_REASON_DST_UNREACHABLE if the destination is + * not reachable, BATADV_TP_REASON_MEMORY_ERROR if the packet couldn't be + * allocated + */ +static int batadv_tp_send_msg(struct batadv_tp_vars *tp_vars, const u8 *src, + struct batadv_orig_node *orig_node, + u32 seqno, size_t len, const u8 *session, + int uid, u32 timestamp) +{ + struct batadv_icmp_tp_packet *icmp; + struct sk_buff *skb; + int r; + u8 *data; + size_t data_len; + + skb = netdev_alloc_skb_ip_align(NULL, len + ETH_HLEN); + if (unlikely(!skb)) + return BATADV_TP_REASON_MEMORY_ERROR; + + skb_reserve(skb, ETH_HLEN); + icmp = skb_put(skb, sizeof(*icmp)); + + /* fill the icmp header */ + ether_addr_copy(icmp->dst, orig_node->orig); + ether_addr_copy(icmp->orig, src); + icmp->version = BATADV_COMPAT_VERSION; + icmp->packet_type = BATADV_ICMP; + icmp->ttl = BATADV_TTL; + icmp->msg_type = BATADV_TP; + icmp->uid = uid; + + icmp->subtype = BATADV_TP_MSG; + memcpy(icmp->session, session, sizeof(icmp->session)); + icmp->seqno = htonl(seqno); + icmp->timestamp = htonl(timestamp); + + data_len = len - sizeof(*icmp); + data = skb_put(skb, data_len); + batadv_tp_fill_prerandom(tp_vars, data, data_len); + + r = batadv_send_skb_to_orig(skb, orig_node, NULL); + if (r == NET_XMIT_SUCCESS) + return 0; + + return BATADV_TP_REASON_CANT_SEND; +} + +/** + * batadv_tp_recv_ack() - ACK receiving function + * @bat_priv: the bat priv with all the soft interface information + * @skb: the buffer containing the received packet + * + * Process a received TP ACK packet + */ +static void batadv_tp_recv_ack(struct batadv_priv *bat_priv, + const struct sk_buff *skb) +{ + struct batadv_hard_iface *primary_if = NULL; + struct batadv_orig_node *orig_node = NULL; + const struct batadv_icmp_tp_packet *icmp; + struct batadv_tp_vars *tp_vars; + const unsigned char *dev_addr; + size_t packet_len, mss; + u32 rtt, recv_ack, cwnd; + + packet_len = BATADV_TP_PLEN; + mss = BATADV_TP_PLEN; + packet_len += sizeof(struct batadv_unicast_packet); + + icmp = (struct batadv_icmp_tp_packet *)skb->data; + + /* find the tp_vars */ + tp_vars = batadv_tp_list_find_session(bat_priv, icmp->orig, + icmp->session); + if (unlikely(!tp_vars)) + return; + + if (unlikely(atomic_read(&tp_vars->sending) == 0)) + goto out; + + /* old ACK? silently drop it.. */ + if (batadv_seq_before(ntohl(icmp->seqno), + (u32)atomic_read(&tp_vars->last_acked))) + goto out; + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (unlikely(!primary_if)) + goto out; + + orig_node = batadv_orig_hash_find(bat_priv, icmp->orig); + if (unlikely(!orig_node)) + goto out; + + /* update RTO with the new sampled RTT, if any */ + rtt = jiffies_to_msecs(jiffies) - ntohl(icmp->timestamp); + if (icmp->timestamp && rtt) + batadv_tp_update_rto(tp_vars, rtt); + + /* ACK for new data... reset the timer */ + batadv_tp_reset_sender_timer(tp_vars); + + recv_ack = ntohl(icmp->seqno); + + /* check if this ACK is a duplicate */ + if (atomic_read(&tp_vars->last_acked) == recv_ack) { + atomic_inc(&tp_vars->dup_acks); + if (atomic_read(&tp_vars->dup_acks) != 3) + goto out; + + if (recv_ack >= tp_vars->recover) + goto out; + + /* if this is the third duplicate ACK do Fast Retransmit */ + batadv_tp_send_msg(tp_vars, primary_if->net_dev->dev_addr, + orig_node, recv_ack, packet_len, + icmp->session, icmp->uid, + jiffies_to_msecs(jiffies)); + + spin_lock_bh(&tp_vars->cwnd_lock); + + /* Fast Recovery */ + tp_vars->fast_recovery = true; + /* Set recover to the last outstanding seqno when Fast Recovery + * is entered. RFC6582, Section 3.2, step 1 + */ + tp_vars->recover = tp_vars->last_sent; + tp_vars->ss_threshold = tp_vars->cwnd >> 1; + batadv_dbg(BATADV_DBG_TP_METER, bat_priv, + "Meter: Fast Recovery, (cur cwnd=%u) ss_thr=%u last_sent=%u recv_ack=%u\n", + tp_vars->cwnd, tp_vars->ss_threshold, + tp_vars->last_sent, recv_ack); + tp_vars->cwnd = batadv_tp_cwnd(tp_vars->ss_threshold, 3 * mss, + mss); + tp_vars->dec_cwnd = 0; + tp_vars->last_sent = recv_ack; + + spin_unlock_bh(&tp_vars->cwnd_lock); + } else { + /* count the acked data */ + atomic64_add(recv_ack - atomic_read(&tp_vars->last_acked), + &tp_vars->tot_sent); + /* reset the duplicate ACKs counter */ + atomic_set(&tp_vars->dup_acks, 0); + + if (tp_vars->fast_recovery) { + /* partial ACK */ + if (batadv_seq_before(recv_ack, tp_vars->recover)) { + /* this is another hole in the window. React + * immediately as specified by NewReno (see + * Section 3.2 of RFC6582 for details) + */ + dev_addr = primary_if->net_dev->dev_addr; + batadv_tp_send_msg(tp_vars, dev_addr, + orig_node, recv_ack, + packet_len, icmp->session, + icmp->uid, + jiffies_to_msecs(jiffies)); + tp_vars->cwnd = batadv_tp_cwnd(tp_vars->cwnd, + mss, mss); + } else { + tp_vars->fast_recovery = false; + /* set cwnd to the value of ss_threshold at the + * moment that Fast Recovery was entered. + * RFC6582, Section 3.2, step 3 + */ + cwnd = batadv_tp_cwnd(tp_vars->ss_threshold, 0, + mss); + tp_vars->cwnd = cwnd; + } + goto move_twnd; + } + + if (recv_ack - atomic_read(&tp_vars->last_acked) >= mss) + batadv_tp_update_cwnd(tp_vars, mss); +move_twnd: + /* move the Transmit Window */ + atomic_set(&tp_vars->last_acked, recv_ack); + } + + wake_up(&tp_vars->more_bytes); +out: + batadv_hardif_put(primary_if); + batadv_orig_node_put(orig_node); + batadv_tp_vars_put(tp_vars); +} + +/** + * batadv_tp_avail() - check if congestion window is not full + * @tp_vars: the private data of the current TP meter session + * @payload_len: size of the payload of a single message + * + * Return: true when congestion window is not full, false otherwise + */ +static bool batadv_tp_avail(struct batadv_tp_vars *tp_vars, + size_t payload_len) +{ + u32 win_left, win_limit; + + win_limit = atomic_read(&tp_vars->last_acked) + tp_vars->cwnd; + win_left = win_limit - tp_vars->last_sent; + + return win_left >= payload_len; +} + +/** + * batadv_tp_wait_available() - wait until congestion window becomes free or + * timeout is reached + * @tp_vars: the private data of the current TP meter session + * @plen: size of the payload of a single message + * + * Return: 0 if the condition evaluated to false after the timeout elapsed, + * 1 if the condition evaluated to true after the timeout elapsed, the + * remaining jiffies (at least 1) if the condition evaluated to true before + * the timeout elapsed, or -ERESTARTSYS if it was interrupted by a signal. + */ +static int batadv_tp_wait_available(struct batadv_tp_vars *tp_vars, size_t plen) +{ + int ret; + + ret = wait_event_interruptible_timeout(tp_vars->more_bytes, + batadv_tp_avail(tp_vars, plen), + HZ / 10); + + return ret; +} + +/** + * batadv_tp_send() - main sending thread of a tp meter session + * @arg: address of the related tp_vars + * + * Return: nothing, this function never returns + */ +static int batadv_tp_send(void *arg) +{ + struct batadv_tp_vars *tp_vars = arg; + struct batadv_priv *bat_priv = tp_vars->bat_priv; + struct batadv_hard_iface *primary_if = NULL; + struct batadv_orig_node *orig_node = NULL; + size_t payload_len, packet_len; + int err = 0; + + if (unlikely(tp_vars->role != BATADV_TP_SENDER)) { + err = BATADV_TP_REASON_DST_UNREACHABLE; + tp_vars->reason = err; + goto out; + } + + orig_node = batadv_orig_hash_find(bat_priv, tp_vars->other_end); + if (unlikely(!orig_node)) { + err = BATADV_TP_REASON_DST_UNREACHABLE; + tp_vars->reason = err; + goto out; + } + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (unlikely(!primary_if)) { + err = BATADV_TP_REASON_DST_UNREACHABLE; + tp_vars->reason = err; + goto out; + } + + /* assume that all the hard_interfaces have a correctly + * configured MTU, so use the soft_iface MTU as MSS. + * This might not be true and in that case the fragmentation + * should be used. + * Now, try to send the packet as it is + */ + payload_len = BATADV_TP_PLEN; + BUILD_BUG_ON(sizeof(struct batadv_icmp_tp_packet) > BATADV_TP_PLEN); + + batadv_tp_reset_sender_timer(tp_vars); + + /* queue the worker in charge of terminating the test */ + queue_delayed_work(batadv_event_workqueue, &tp_vars->finish_work, + msecs_to_jiffies(tp_vars->test_length)); + + while (atomic_read(&tp_vars->sending) != 0) { + if (unlikely(!batadv_tp_avail(tp_vars, payload_len))) { + batadv_tp_wait_available(tp_vars, payload_len); + continue; + } + + /* to emulate normal unicast traffic, add to the payload len + * the size of the unicast header + */ + packet_len = payload_len + sizeof(struct batadv_unicast_packet); + + err = batadv_tp_send_msg(tp_vars, primary_if->net_dev->dev_addr, + orig_node, tp_vars->last_sent, + packet_len, + tp_vars->session, tp_vars->icmp_uid, + jiffies_to_msecs(jiffies)); + + /* something went wrong during the preparation/transmission */ + if (unlikely(err && err != BATADV_TP_REASON_CANT_SEND)) { + batadv_dbg(BATADV_DBG_TP_METER, bat_priv, + "Meter: %s() cannot send packets (%d)\n", + __func__, err); + /* ensure nobody else tries to stop the thread now */ + if (atomic_dec_and_test(&tp_vars->sending)) + tp_vars->reason = err; + break; + } + + /* right-shift the TWND */ + if (!err) + tp_vars->last_sent += payload_len; + + cond_resched(); + } + +out: + batadv_hardif_put(primary_if); + batadv_orig_node_put(orig_node); + + batadv_tp_sender_end(bat_priv, tp_vars); + batadv_tp_sender_cleanup(bat_priv, tp_vars); + + batadv_tp_vars_put(tp_vars); + + return 0; +} + +/** + * batadv_tp_start_kthread() - start new thread which manages the tp meter + * sender + * @tp_vars: the private data of the current TP meter session + */ +static void batadv_tp_start_kthread(struct batadv_tp_vars *tp_vars) +{ + struct task_struct *kthread; + struct batadv_priv *bat_priv = tp_vars->bat_priv; + u32 session_cookie; + + kref_get(&tp_vars->refcount); + kthread = kthread_create(batadv_tp_send, tp_vars, "kbatadv_tp_meter"); + if (IS_ERR(kthread)) { + session_cookie = batadv_tp_session_cookie(tp_vars->session, + tp_vars->icmp_uid); + pr_err("batadv: cannot create tp meter kthread\n"); + batadv_tp_batctl_error_notify(BATADV_TP_REASON_MEMORY_ERROR, + tp_vars->other_end, + bat_priv, session_cookie); + + /* drop reserved reference for kthread */ + batadv_tp_vars_put(tp_vars); + + /* cleanup of failed tp meter variables */ + batadv_tp_sender_cleanup(bat_priv, tp_vars); + return; + } + + wake_up_process(kthread); +} + +/** + * batadv_tp_start() - start a new tp meter session + * @bat_priv: the bat priv with all the soft interface information + * @dst: the receiver MAC address + * @test_length: test length in milliseconds + * @cookie: session cookie + */ +void batadv_tp_start(struct batadv_priv *bat_priv, const u8 *dst, + u32 test_length, u32 *cookie) +{ + struct batadv_tp_vars *tp_vars; + u8 session_id[2]; + u8 icmp_uid; + u32 session_cookie; + + get_random_bytes(session_id, sizeof(session_id)); + get_random_bytes(&icmp_uid, 1); + session_cookie = batadv_tp_session_cookie(session_id, icmp_uid); + *cookie = session_cookie; + + /* look for an already existing test towards this node */ + spin_lock_bh(&bat_priv->tp_list_lock); + tp_vars = batadv_tp_list_find(bat_priv, dst); + if (tp_vars) { + spin_unlock_bh(&bat_priv->tp_list_lock); + batadv_tp_vars_put(tp_vars); + batadv_dbg(BATADV_DBG_TP_METER, bat_priv, + "Meter: test to or from the same node already ongoing, aborting\n"); + batadv_tp_batctl_error_notify(BATADV_TP_REASON_ALREADY_ONGOING, + dst, bat_priv, session_cookie); + return; + } + + if (!atomic_add_unless(&bat_priv->tp_num, 1, BATADV_TP_MAX_NUM)) { + spin_unlock_bh(&bat_priv->tp_list_lock); + batadv_dbg(BATADV_DBG_TP_METER, bat_priv, + "Meter: too many ongoing sessions, aborting (SEND)\n"); + batadv_tp_batctl_error_notify(BATADV_TP_REASON_TOO_MANY, dst, + bat_priv, session_cookie); + return; + } + + tp_vars = kmalloc(sizeof(*tp_vars), GFP_ATOMIC); + if (!tp_vars) { + spin_unlock_bh(&bat_priv->tp_list_lock); + batadv_dbg(BATADV_DBG_TP_METER, bat_priv, + "Meter: %s cannot allocate list elements\n", + __func__); + batadv_tp_batctl_error_notify(BATADV_TP_REASON_MEMORY_ERROR, + dst, bat_priv, session_cookie); + return; + } + + /* initialize tp_vars */ + ether_addr_copy(tp_vars->other_end, dst); + kref_init(&tp_vars->refcount); + tp_vars->role = BATADV_TP_SENDER; + atomic_set(&tp_vars->sending, 1); + memcpy(tp_vars->session, session_id, sizeof(session_id)); + tp_vars->icmp_uid = icmp_uid; + + tp_vars->last_sent = BATADV_TP_FIRST_SEQ; + atomic_set(&tp_vars->last_acked, BATADV_TP_FIRST_SEQ); + tp_vars->fast_recovery = false; + tp_vars->recover = BATADV_TP_FIRST_SEQ; + + /* initialise the CWND to 3*MSS (Section 3.1 in RFC5681). + * For batman-adv the MSS is the size of the payload received by the + * soft_interface, hence its MTU + */ + tp_vars->cwnd = BATADV_TP_PLEN * 3; + /* at the beginning initialise the SS threshold to the biggest possible + * window size, hence the AWND size + */ + tp_vars->ss_threshold = BATADV_TP_AWND; + + /* RTO initial value is 3 seconds. + * Details in Section 2.1 of RFC6298 + */ + tp_vars->rto = 1000; + tp_vars->srtt = 0; + tp_vars->rttvar = 0; + + atomic64_set(&tp_vars->tot_sent, 0); + + kref_get(&tp_vars->refcount); + timer_setup(&tp_vars->timer, batadv_tp_sender_timeout, 0); + + tp_vars->bat_priv = bat_priv; + tp_vars->start_time = jiffies; + + init_waitqueue_head(&tp_vars->more_bytes); + + spin_lock_init(&tp_vars->unacked_lock); + INIT_LIST_HEAD(&tp_vars->unacked_list); + + spin_lock_init(&tp_vars->cwnd_lock); + + tp_vars->prerandom_offset = 0; + spin_lock_init(&tp_vars->prerandom_lock); + + kref_get(&tp_vars->refcount); + hlist_add_head_rcu(&tp_vars->list, &bat_priv->tp_list); + spin_unlock_bh(&bat_priv->tp_list_lock); + + tp_vars->test_length = test_length; + if (!tp_vars->test_length) + tp_vars->test_length = BATADV_TP_DEF_TEST_LENGTH; + + batadv_dbg(BATADV_DBG_TP_METER, bat_priv, + "Meter: starting throughput meter towards %pM (length=%ums)\n", + dst, test_length); + + /* init work item for finished tp tests */ + INIT_DELAYED_WORK(&tp_vars->finish_work, batadv_tp_sender_finish); + + /* start tp kthread. This way the write() call issued from userspace can + * happily return and avoid to block + */ + batadv_tp_start_kthread(tp_vars); + + /* don't return reference to new tp_vars */ + batadv_tp_vars_put(tp_vars); +} + +/** + * batadv_tp_stop() - stop currently running tp meter session + * @bat_priv: the bat priv with all the soft interface information + * @dst: the receiver MAC address + * @return_value: reason for tp meter session stop + */ +void batadv_tp_stop(struct batadv_priv *bat_priv, const u8 *dst, + u8 return_value) +{ + struct batadv_orig_node *orig_node; + struct batadv_tp_vars *tp_vars; + + batadv_dbg(BATADV_DBG_TP_METER, bat_priv, + "Meter: stopping test towards %pM\n", dst); + + orig_node = batadv_orig_hash_find(bat_priv, dst); + if (!orig_node) + return; + + tp_vars = batadv_tp_list_find(bat_priv, orig_node->orig); + if (!tp_vars) { + batadv_dbg(BATADV_DBG_TP_METER, bat_priv, + "Meter: trying to interrupt an already over connection\n"); + goto out; + } + + batadv_tp_sender_shutdown(tp_vars, return_value); + batadv_tp_vars_put(tp_vars); +out: + batadv_orig_node_put(orig_node); +} + +/** + * batadv_tp_reset_receiver_timer() - reset the receiver shutdown timer + * @tp_vars: the private data of the current TP meter session + * + * start the receiver shutdown timer or reset it if already started + */ +static void batadv_tp_reset_receiver_timer(struct batadv_tp_vars *tp_vars) +{ + mod_timer(&tp_vars->timer, + jiffies + msecs_to_jiffies(BATADV_TP_RECV_TIMEOUT)); +} + +/** + * batadv_tp_receiver_shutdown() - stop a tp meter receiver when timeout is + * reached without received ack + * @t: address to timer_list inside tp_vars + */ +static void batadv_tp_receiver_shutdown(struct timer_list *t) +{ + struct batadv_tp_vars *tp_vars = from_timer(tp_vars, t, timer); + struct batadv_tp_unacked *un, *safe; + struct batadv_priv *bat_priv; + + bat_priv = tp_vars->bat_priv; + + /* if there is recent activity rearm the timer */ + if (!batadv_has_timed_out(tp_vars->last_recv_time, + BATADV_TP_RECV_TIMEOUT)) { + /* reset the receiver shutdown timer */ + batadv_tp_reset_receiver_timer(tp_vars); + return; + } + + batadv_dbg(BATADV_DBG_TP_METER, bat_priv, + "Shutting down for inactivity (more than %dms) from %pM\n", + BATADV_TP_RECV_TIMEOUT, tp_vars->other_end); + + spin_lock_bh(&tp_vars->bat_priv->tp_list_lock); + hlist_del_rcu(&tp_vars->list); + spin_unlock_bh(&tp_vars->bat_priv->tp_list_lock); + + /* drop list reference */ + batadv_tp_vars_put(tp_vars); + + atomic_dec(&bat_priv->tp_num); + + spin_lock_bh(&tp_vars->unacked_lock); + list_for_each_entry_safe(un, safe, &tp_vars->unacked_list, list) { + list_del(&un->list); + kfree(un); + } + spin_unlock_bh(&tp_vars->unacked_lock); + + /* drop reference of timer */ + batadv_tp_vars_put(tp_vars); +} + +/** + * batadv_tp_send_ack() - send an ACK packet + * @bat_priv: the bat priv with all the soft interface information + * @dst: the mac address of the destination originator + * @seq: the sequence number to ACK + * @timestamp: the timestamp to echo back in the ACK + * @session: session identifier + * @socket_index: local ICMP socket identifier + * + * Return: 0 on success, a positive integer representing the reason of the + * failure otherwise + */ +static int batadv_tp_send_ack(struct batadv_priv *bat_priv, const u8 *dst, + u32 seq, __be32 timestamp, const u8 *session, + int socket_index) +{ + struct batadv_hard_iface *primary_if = NULL; + struct batadv_orig_node *orig_node; + struct batadv_icmp_tp_packet *icmp; + struct sk_buff *skb; + int r, ret; + + orig_node = batadv_orig_hash_find(bat_priv, dst); + if (unlikely(!orig_node)) { + ret = BATADV_TP_REASON_DST_UNREACHABLE; + goto out; + } + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (unlikely(!primary_if)) { + ret = BATADV_TP_REASON_DST_UNREACHABLE; + goto out; + } + + skb = netdev_alloc_skb_ip_align(NULL, sizeof(*icmp) + ETH_HLEN); + if (unlikely(!skb)) { + ret = BATADV_TP_REASON_MEMORY_ERROR; + goto out; + } + + skb_reserve(skb, ETH_HLEN); + icmp = skb_put(skb, sizeof(*icmp)); + icmp->packet_type = BATADV_ICMP; + icmp->version = BATADV_COMPAT_VERSION; + icmp->ttl = BATADV_TTL; + icmp->msg_type = BATADV_TP; + ether_addr_copy(icmp->dst, orig_node->orig); + ether_addr_copy(icmp->orig, primary_if->net_dev->dev_addr); + icmp->uid = socket_index; + + icmp->subtype = BATADV_TP_ACK; + memcpy(icmp->session, session, sizeof(icmp->session)); + icmp->seqno = htonl(seq); + icmp->timestamp = timestamp; + + /* send the ack */ + r = batadv_send_skb_to_orig(skb, orig_node, NULL); + if (unlikely(r < 0) || r == NET_XMIT_DROP) { + ret = BATADV_TP_REASON_DST_UNREACHABLE; + goto out; + } + ret = 0; + +out: + batadv_orig_node_put(orig_node); + batadv_hardif_put(primary_if); + + return ret; +} + +/** + * batadv_tp_handle_out_of_order() - store an out of order packet + * @tp_vars: the private data of the current TP meter session + * @skb: the buffer containing the received packet + * + * Store the out of order packet in the unacked list for late processing. This + * packets are kept in this list so that they can be ACKed at once as soon as + * all the previous packets have been received + * + * Return: true if the packed has been successfully processed, false otherwise + */ +static bool batadv_tp_handle_out_of_order(struct batadv_tp_vars *tp_vars, + const struct sk_buff *skb) +{ + const struct batadv_icmp_tp_packet *icmp; + struct batadv_tp_unacked *un, *new; + u32 payload_len; + bool added = false; + + new = kmalloc(sizeof(*new), GFP_ATOMIC); + if (unlikely(!new)) + return false; + + icmp = (struct batadv_icmp_tp_packet *)skb->data; + + new->seqno = ntohl(icmp->seqno); + payload_len = skb->len - sizeof(struct batadv_unicast_packet); + new->len = payload_len; + + spin_lock_bh(&tp_vars->unacked_lock); + /* if the list is empty immediately attach this new object */ + if (list_empty(&tp_vars->unacked_list)) { + list_add(&new->list, &tp_vars->unacked_list); + goto out; + } + + /* otherwise loop over the list and either drop the packet because this + * is a duplicate or store it at the right position. + * + * The iteration is done in the reverse way because it is likely that + * the last received packet (the one being processed now) has a bigger + * seqno than all the others already stored. + */ + list_for_each_entry_reverse(un, &tp_vars->unacked_list, list) { + /* check for duplicates */ + if (new->seqno == un->seqno) { + if (new->len > un->len) + un->len = new->len; + kfree(new); + added = true; + break; + } + + /* look for the right position */ + if (batadv_seq_before(new->seqno, un->seqno)) + continue; + + /* as soon as an entry having a bigger seqno is found, the new + * one is attached _after_ it. In this way the list is kept in + * ascending order + */ + list_add_tail(&new->list, &un->list); + added = true; + break; + } + + /* received packet with smallest seqno out of order; add it to front */ + if (!added) + list_add(&new->list, &tp_vars->unacked_list); + +out: + spin_unlock_bh(&tp_vars->unacked_lock); + + return true; +} + +/** + * batadv_tp_ack_unordered() - update number received bytes in current stream + * without gaps + * @tp_vars: the private data of the current TP meter session + */ +static void batadv_tp_ack_unordered(struct batadv_tp_vars *tp_vars) +{ + struct batadv_tp_unacked *un, *safe; + u32 to_ack; + + /* go through the unacked packet list and possibly ACK them as + * well + */ + spin_lock_bh(&tp_vars->unacked_lock); + list_for_each_entry_safe(un, safe, &tp_vars->unacked_list, list) { + /* the list is ordered, therefore it is possible to stop as soon + * there is a gap between the last acked seqno and the seqno of + * the packet under inspection + */ + if (batadv_seq_before(tp_vars->last_recv, un->seqno)) + break; + + to_ack = un->seqno + un->len - tp_vars->last_recv; + + if (batadv_seq_before(tp_vars->last_recv, un->seqno + un->len)) + tp_vars->last_recv += to_ack; + + list_del(&un->list); + kfree(un); + } + spin_unlock_bh(&tp_vars->unacked_lock); +} + +/** + * batadv_tp_init_recv() - return matching or create new receiver tp_vars + * @bat_priv: the bat priv with all the soft interface information + * @icmp: received icmp tp msg + * + * Return: corresponding tp_vars or NULL on errors + */ +static struct batadv_tp_vars * +batadv_tp_init_recv(struct batadv_priv *bat_priv, + const struct batadv_icmp_tp_packet *icmp) +{ + struct batadv_tp_vars *tp_vars; + + spin_lock_bh(&bat_priv->tp_list_lock); + tp_vars = batadv_tp_list_find_session(bat_priv, icmp->orig, + icmp->session); + if (tp_vars) + goto out_unlock; + + if (!atomic_add_unless(&bat_priv->tp_num, 1, BATADV_TP_MAX_NUM)) { + batadv_dbg(BATADV_DBG_TP_METER, bat_priv, + "Meter: too many ongoing sessions, aborting (RECV)\n"); + goto out_unlock; + } + + tp_vars = kmalloc(sizeof(*tp_vars), GFP_ATOMIC); + if (!tp_vars) + goto out_unlock; + + ether_addr_copy(tp_vars->other_end, icmp->orig); + tp_vars->role = BATADV_TP_RECEIVER; + memcpy(tp_vars->session, icmp->session, sizeof(tp_vars->session)); + tp_vars->last_recv = BATADV_TP_FIRST_SEQ; + tp_vars->bat_priv = bat_priv; + kref_init(&tp_vars->refcount); + + spin_lock_init(&tp_vars->unacked_lock); + INIT_LIST_HEAD(&tp_vars->unacked_list); + + kref_get(&tp_vars->refcount); + hlist_add_head_rcu(&tp_vars->list, &bat_priv->tp_list); + + kref_get(&tp_vars->refcount); + timer_setup(&tp_vars->timer, batadv_tp_receiver_shutdown, 0); + + batadv_tp_reset_receiver_timer(tp_vars); + +out_unlock: + spin_unlock_bh(&bat_priv->tp_list_lock); + + return tp_vars; +} + +/** + * batadv_tp_recv_msg() - process a single data message + * @bat_priv: the bat priv with all the soft interface information + * @skb: the buffer containing the received packet + * + * Process a received TP MSG packet + */ +static void batadv_tp_recv_msg(struct batadv_priv *bat_priv, + const struct sk_buff *skb) +{ + const struct batadv_icmp_tp_packet *icmp; + struct batadv_tp_vars *tp_vars; + size_t packet_size; + u32 seqno; + + icmp = (struct batadv_icmp_tp_packet *)skb->data; + + seqno = ntohl(icmp->seqno); + /* check if this is the first seqno. This means that if the + * first packet is lost, the tp meter does not work anymore! + */ + if (seqno == BATADV_TP_FIRST_SEQ) { + tp_vars = batadv_tp_init_recv(bat_priv, icmp); + if (!tp_vars) { + batadv_dbg(BATADV_DBG_TP_METER, bat_priv, + "Meter: seqno != BATADV_TP_FIRST_SEQ cannot initiate connection\n"); + goto out; + } + } else { + tp_vars = batadv_tp_list_find_session(bat_priv, icmp->orig, + icmp->session); + if (!tp_vars) { + batadv_dbg(BATADV_DBG_TP_METER, bat_priv, + "Unexpected packet from %pM!\n", + icmp->orig); + goto out; + } + } + + if (unlikely(tp_vars->role != BATADV_TP_RECEIVER)) { + batadv_dbg(BATADV_DBG_TP_METER, bat_priv, + "Meter: dropping packet: not expected (role=%u)\n", + tp_vars->role); + goto out; + } + + tp_vars->last_recv_time = jiffies; + + /* if the packet is a duplicate, it may be the case that an ACK has been + * lost. Resend the ACK + */ + if (batadv_seq_before(seqno, tp_vars->last_recv)) + goto send_ack; + + /* if the packet is out of order enqueue it */ + if (ntohl(icmp->seqno) != tp_vars->last_recv) { + /* exit immediately (and do not send any ACK) if the packet has + * not been enqueued correctly + */ + if (!batadv_tp_handle_out_of_order(tp_vars, skb)) + goto out; + + /* send a duplicate ACK */ + goto send_ack; + } + + /* if everything was fine count the ACKed bytes */ + packet_size = skb->len - sizeof(struct batadv_unicast_packet); + tp_vars->last_recv += packet_size; + + /* check if this ordered message filled a gap.... */ + batadv_tp_ack_unordered(tp_vars); + +send_ack: + /* send the ACK. If the received packet was out of order, the ACK that + * is going to be sent is a duplicate (the sender will count them and + * possibly enter Fast Retransmit as soon as it has reached 3) + */ + batadv_tp_send_ack(bat_priv, icmp->orig, tp_vars->last_recv, + icmp->timestamp, icmp->session, icmp->uid); +out: + batadv_tp_vars_put(tp_vars); +} + +/** + * batadv_tp_meter_recv() - main TP Meter receiving function + * @bat_priv: the bat priv with all the soft interface information + * @skb: the buffer containing the received packet + */ +void batadv_tp_meter_recv(struct batadv_priv *bat_priv, struct sk_buff *skb) +{ + struct batadv_icmp_tp_packet *icmp; + + icmp = (struct batadv_icmp_tp_packet *)skb->data; + + switch (icmp->subtype) { + case BATADV_TP_MSG: + batadv_tp_recv_msg(bat_priv, skb); + break; + case BATADV_TP_ACK: + batadv_tp_recv_ack(bat_priv, skb); + break; + default: + batadv_dbg(BATADV_DBG_TP_METER, bat_priv, + "Received unknown TP Metric packet type %u\n", + icmp->subtype); + } + consume_skb(skb); +} + +/** + * batadv_tp_meter_init() - initialize global tp_meter structures + */ +void __init batadv_tp_meter_init(void) +{ + get_random_bytes(batadv_tp_prerandom, sizeof(batadv_tp_prerandom)); +} diff --git a/net/batman-adv/tp_meter.h b/net/batman-adv/tp_meter.h new file mode 100644 index 000000000..f0046d366 --- /dev/null +++ b/net/batman-adv/tp_meter.h @@ -0,0 +1,22 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Edo Monticelli, Antonio Quartulli + */ + +#ifndef _NET_BATMAN_ADV_TP_METER_H_ +#define _NET_BATMAN_ADV_TP_METER_H_ + +#include "main.h" + +#include <linux/skbuff.h> +#include <linux/types.h> + +void batadv_tp_meter_init(void); +void batadv_tp_start(struct batadv_priv *bat_priv, const u8 *dst, + u32 test_length, u32 *cookie); +void batadv_tp_stop(struct batadv_priv *bat_priv, const u8 *dst, + u8 return_value); +void batadv_tp_meter_recv(struct batadv_priv *bat_priv, struct sk_buff *skb); + +#endif /* _NET_BATMAN_ADV_TP_METER_H_ */ diff --git a/net/batman-adv/trace.c b/net/batman-adv/trace.c new file mode 100644 index 000000000..ec8b95190 --- /dev/null +++ b/net/batman-adv/trace.c @@ -0,0 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Sven Eckelmann + */ + +#define CREATE_TRACE_POINTS +#include "trace.h" diff --git a/net/batman-adv/trace.h b/net/batman-adv/trace.h new file mode 100644 index 000000000..5dd52bc5c --- /dev/null +++ b/net/batman-adv/trace.h @@ -0,0 +1,64 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Sven Eckelmann + */ + +#if !defined(_NET_BATMAN_ADV_TRACE_H_) || defined(TRACE_HEADER_MULTI_READ) +#define _NET_BATMAN_ADV_TRACE_H_ + +#include "main.h" + +#include <linux/netdevice.h> +#include <linux/percpu.h> +#include <linux/printk.h> +#include <linux/tracepoint.h> + +#undef TRACE_SYSTEM +#define TRACE_SYSTEM batadv + +/* provide dummy function when tracing is disabled */ +#if !defined(CONFIG_BATMAN_ADV_TRACING) + +#undef TRACE_EVENT +#define TRACE_EVENT(name, proto, ...) \ + static inline void trace_ ## name(proto) {} + +#endif /* CONFIG_BATMAN_ADV_TRACING */ + +TRACE_EVENT(batadv_dbg, + + TP_PROTO(struct batadv_priv *bat_priv, + struct va_format *vaf), + + TP_ARGS(bat_priv, vaf), + + TP_STRUCT__entry( + __string(device, bat_priv->soft_iface->name) + __string(driver, KBUILD_MODNAME) + __vstring(msg, vaf->fmt, vaf->va) + ), + + TP_fast_assign( + __assign_str(device, bat_priv->soft_iface->name); + __assign_str(driver, KBUILD_MODNAME); + __assign_vstr(msg, vaf->fmt, vaf->va); + ), + + TP_printk( + "%s %s %s", + __get_str(driver), + __get_str(device), + __get_str(msg) + ) +); + +#endif /* _NET_BATMAN_ADV_TRACE_H_ || TRACE_HEADER_MULTI_READ */ + +#undef TRACE_INCLUDE_PATH +#define TRACE_INCLUDE_PATH . +#undef TRACE_INCLUDE_FILE +#define TRACE_INCLUDE_FILE trace + +/* This part must be outside protection */ +#include <trace/define_trace.h> diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c new file mode 100644 index 000000000..5d8cee747 --- /dev/null +++ b/net/batman-adv/translation-table.c @@ -0,0 +1,4290 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich, Antonio Quartulli + */ + +#include "translation-table.h" +#include "main.h" + +#include <linux/atomic.h> +#include <linux/bitops.h> +#include <linux/build_bug.h> +#include <linux/byteorder/generic.h> +#include <linux/cache.h> +#include <linux/compiler.h> +#include <linux/container_of.h> +#include <linux/crc32c.h> +#include <linux/errno.h> +#include <linux/etherdevice.h> +#include <linux/gfp.h> +#include <linux/if_ether.h> +#include <linux/init.h> +#include <linux/jhash.h> +#include <linux/jiffies.h> +#include <linux/kref.h> +#include <linux/list.h> +#include <linux/lockdep.h> +#include <linux/net.h> +#include <linux/netdevice.h> +#include <linux/netlink.h> +#include <linux/rculist.h> +#include <linux/rcupdate.h> +#include <linux/skbuff.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/stddef.h> +#include <linux/string.h> +#include <linux/workqueue.h> +#include <net/genetlink.h> +#include <net/netlink.h> +#include <net/sock.h> +#include <uapi/linux/batadv_packet.h> +#include <uapi/linux/batman_adv.h> + +#include "bridge_loop_avoidance.h" +#include "hard-interface.h" +#include "hash.h" +#include "log.h" +#include "netlink.h" +#include "originator.h" +#include "soft-interface.h" +#include "tvlv.h" + +static struct kmem_cache *batadv_tl_cache __read_mostly; +static struct kmem_cache *batadv_tg_cache __read_mostly; +static struct kmem_cache *batadv_tt_orig_cache __read_mostly; +static struct kmem_cache *batadv_tt_change_cache __read_mostly; +static struct kmem_cache *batadv_tt_req_cache __read_mostly; +static struct kmem_cache *batadv_tt_roam_cache __read_mostly; + +/* hash class keys */ +static struct lock_class_key batadv_tt_local_hash_lock_class_key; +static struct lock_class_key batadv_tt_global_hash_lock_class_key; + +static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client, + unsigned short vid, + struct batadv_orig_node *orig_node); +static void batadv_tt_purge(struct work_struct *work); +static void +batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry); +static void batadv_tt_global_del(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + const unsigned char *addr, + unsigned short vid, const char *message, + bool roaming); + +/** + * batadv_compare_tt() - check if two TT entries are the same + * @node: the list element pointer of the first TT entry + * @data2: pointer to the tt_common_entry of the second TT entry + * + * Compare the MAC address and the VLAN ID of the two TT entries and check if + * they are the same TT client. + * Return: true if the two TT clients are the same, false otherwise + */ +static bool batadv_compare_tt(const struct hlist_node *node, const void *data2) +{ + const void *data1 = container_of(node, struct batadv_tt_common_entry, + hash_entry); + const struct batadv_tt_common_entry *tt1 = data1; + const struct batadv_tt_common_entry *tt2 = data2; + + return (tt1->vid == tt2->vid) && batadv_compare_eth(data1, data2); +} + +/** + * batadv_choose_tt() - return the index of the tt entry in the hash table + * @data: pointer to the tt_common_entry object to map + * @size: the size of the hash table + * + * Return: the hash index where the object represented by 'data' should be + * stored at. + */ +static inline u32 batadv_choose_tt(const void *data, u32 size) +{ + const struct batadv_tt_common_entry *tt; + u32 hash = 0; + + tt = data; + hash = jhash(&tt->addr, ETH_ALEN, hash); + hash = jhash(&tt->vid, sizeof(tt->vid), hash); + + return hash % size; +} + +/** + * batadv_tt_hash_find() - look for a client in the given hash table + * @hash: the hash table to search + * @addr: the mac address of the client to look for + * @vid: VLAN identifier + * + * Return: a pointer to the tt_common struct belonging to the searched client if + * found, NULL otherwise. + */ +static struct batadv_tt_common_entry * +batadv_tt_hash_find(struct batadv_hashtable *hash, const u8 *addr, + unsigned short vid) +{ + struct hlist_head *head; + struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL; + u32 index; + + if (!hash) + return NULL; + + ether_addr_copy(to_search.addr, addr); + to_search.vid = vid; + + index = batadv_choose_tt(&to_search, hash->size); + head = &hash->table[index]; + + rcu_read_lock(); + hlist_for_each_entry_rcu(tt, head, hash_entry) { + if (!batadv_compare_eth(tt, addr)) + continue; + + if (tt->vid != vid) + continue; + + if (!kref_get_unless_zero(&tt->refcount)) + continue; + + tt_tmp = tt; + break; + } + rcu_read_unlock(); + + return tt_tmp; +} + +/** + * batadv_tt_local_hash_find() - search the local table for a given client + * @bat_priv: the bat priv with all the soft interface information + * @addr: the mac address of the client to look for + * @vid: VLAN identifier + * + * Return: a pointer to the corresponding tt_local_entry struct if the client is + * found, NULL otherwise. + */ +static struct batadv_tt_local_entry * +batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const u8 *addr, + unsigned short vid) +{ + struct batadv_tt_common_entry *tt_common_entry; + struct batadv_tt_local_entry *tt_local_entry = NULL; + + tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, addr, + vid); + if (tt_common_entry) + tt_local_entry = container_of(tt_common_entry, + struct batadv_tt_local_entry, + common); + return tt_local_entry; +} + +/** + * batadv_tt_global_hash_find() - search the global table for a given client + * @bat_priv: the bat priv with all the soft interface information + * @addr: the mac address of the client to look for + * @vid: VLAN identifier + * + * Return: a pointer to the corresponding tt_global_entry struct if the client + * is found, NULL otherwise. + */ +struct batadv_tt_global_entry * +batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const u8 *addr, + unsigned short vid) +{ + struct batadv_tt_common_entry *tt_common_entry; + struct batadv_tt_global_entry *tt_global_entry = NULL; + + tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, addr, + vid); + if (tt_common_entry) + tt_global_entry = container_of(tt_common_entry, + struct batadv_tt_global_entry, + common); + return tt_global_entry; +} + +/** + * batadv_tt_local_entry_free_rcu() - free the tt_local_entry + * @rcu: rcu pointer of the tt_local_entry + */ +static void batadv_tt_local_entry_free_rcu(struct rcu_head *rcu) +{ + struct batadv_tt_local_entry *tt_local_entry; + + tt_local_entry = container_of(rcu, struct batadv_tt_local_entry, + common.rcu); + + kmem_cache_free(batadv_tl_cache, tt_local_entry); +} + +/** + * batadv_tt_local_entry_release() - release tt_local_entry from lists and queue + * for free after rcu grace period + * @ref: kref pointer of the nc_node + */ +static void batadv_tt_local_entry_release(struct kref *ref) +{ + struct batadv_tt_local_entry *tt_local_entry; + + tt_local_entry = container_of(ref, struct batadv_tt_local_entry, + common.refcount); + + batadv_softif_vlan_put(tt_local_entry->vlan); + + call_rcu(&tt_local_entry->common.rcu, batadv_tt_local_entry_free_rcu); +} + +/** + * batadv_tt_local_entry_put() - decrement the tt_local_entry refcounter and + * possibly release it + * @tt_local_entry: tt_local_entry to be free'd + */ +static void +batadv_tt_local_entry_put(struct batadv_tt_local_entry *tt_local_entry) +{ + if (!tt_local_entry) + return; + + kref_put(&tt_local_entry->common.refcount, + batadv_tt_local_entry_release); +} + +/** + * batadv_tt_global_entry_free_rcu() - free the tt_global_entry + * @rcu: rcu pointer of the tt_global_entry + */ +static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu) +{ + struct batadv_tt_global_entry *tt_global_entry; + + tt_global_entry = container_of(rcu, struct batadv_tt_global_entry, + common.rcu); + + kmem_cache_free(batadv_tg_cache, tt_global_entry); +} + +/** + * batadv_tt_global_entry_release() - release tt_global_entry from lists and + * queue for free after rcu grace period + * @ref: kref pointer of the nc_node + */ +void batadv_tt_global_entry_release(struct kref *ref) +{ + struct batadv_tt_global_entry *tt_global_entry; + + tt_global_entry = container_of(ref, struct batadv_tt_global_entry, + common.refcount); + + batadv_tt_global_del_orig_list(tt_global_entry); + + call_rcu(&tt_global_entry->common.rcu, batadv_tt_global_entry_free_rcu); +} + +/** + * batadv_tt_global_hash_count() - count the number of orig entries + * @bat_priv: the bat priv with all the soft interface information + * @addr: the mac address of the client to count entries for + * @vid: VLAN identifier + * + * Return: the number of originators advertising the given address/data + * (excluding our self). + */ +int batadv_tt_global_hash_count(struct batadv_priv *bat_priv, + const u8 *addr, unsigned short vid) +{ + struct batadv_tt_global_entry *tt_global_entry; + int count; + + tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid); + if (!tt_global_entry) + return 0; + + count = atomic_read(&tt_global_entry->orig_list_count); + batadv_tt_global_entry_put(tt_global_entry); + + return count; +} + +/** + * batadv_tt_local_size_mod() - change the size by v of the local table + * identified by vid + * @bat_priv: the bat priv with all the soft interface information + * @vid: the VLAN identifier of the sub-table to change + * @v: the amount to sum to the local table size + */ +static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv, + unsigned short vid, int v) +{ + struct batadv_softif_vlan *vlan; + + vlan = batadv_softif_vlan_get(bat_priv, vid); + if (!vlan) + return; + + atomic_add(v, &vlan->tt.num_entries); + + batadv_softif_vlan_put(vlan); +} + +/** + * batadv_tt_local_size_inc() - increase by one the local table size for the + * given vid + * @bat_priv: the bat priv with all the soft interface information + * @vid: the VLAN identifier + */ +static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv, + unsigned short vid) +{ + batadv_tt_local_size_mod(bat_priv, vid, 1); +} + +/** + * batadv_tt_local_size_dec() - decrease by one the local table size for the + * given vid + * @bat_priv: the bat priv with all the soft interface information + * @vid: the VLAN identifier + */ +static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv, + unsigned short vid) +{ + batadv_tt_local_size_mod(bat_priv, vid, -1); +} + +/** + * batadv_tt_global_size_mod() - change the size by v of the global table + * for orig_node identified by vid + * @orig_node: the originator for which the table has to be modified + * @vid: the VLAN identifier + * @v: the amount to sum to the global table size + */ +static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node, + unsigned short vid, int v) +{ + struct batadv_orig_node_vlan *vlan; + + vlan = batadv_orig_node_vlan_new(orig_node, vid); + if (!vlan) + return; + + if (atomic_add_return(v, &vlan->tt.num_entries) == 0) { + spin_lock_bh(&orig_node->vlan_list_lock); + if (!hlist_unhashed(&vlan->list)) { + hlist_del_init_rcu(&vlan->list); + batadv_orig_node_vlan_put(vlan); + } + spin_unlock_bh(&orig_node->vlan_list_lock); + } + + batadv_orig_node_vlan_put(vlan); +} + +/** + * batadv_tt_global_size_inc() - increase by one the global table size for the + * given vid + * @orig_node: the originator which global table size has to be decreased + * @vid: the vlan identifier + */ +static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node, + unsigned short vid) +{ + batadv_tt_global_size_mod(orig_node, vid, 1); +} + +/** + * batadv_tt_global_size_dec() - decrease by one the global table size for the + * given vid + * @orig_node: the originator which global table size has to be decreased + * @vid: the vlan identifier + */ +static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node, + unsigned short vid) +{ + batadv_tt_global_size_mod(orig_node, vid, -1); +} + +/** + * batadv_tt_orig_list_entry_free_rcu() - free the orig_entry + * @rcu: rcu pointer of the orig_entry + */ +static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu) +{ + struct batadv_tt_orig_list_entry *orig_entry; + + orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu); + + kmem_cache_free(batadv_tt_orig_cache, orig_entry); +} + +/** + * batadv_tt_orig_list_entry_release() - release tt orig entry from lists and + * queue for free after rcu grace period + * @ref: kref pointer of the tt orig entry + */ +static void batadv_tt_orig_list_entry_release(struct kref *ref) +{ + struct batadv_tt_orig_list_entry *orig_entry; + + orig_entry = container_of(ref, struct batadv_tt_orig_list_entry, + refcount); + + batadv_orig_node_put(orig_entry->orig_node); + call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu); +} + +/** + * batadv_tt_orig_list_entry_put() - decrement the tt orig entry refcounter and + * possibly release it + * @orig_entry: tt orig entry to be free'd + */ +static void +batadv_tt_orig_list_entry_put(struct batadv_tt_orig_list_entry *orig_entry) +{ + if (!orig_entry) + return; + + kref_put(&orig_entry->refcount, batadv_tt_orig_list_entry_release); +} + +/** + * batadv_tt_local_event() - store a local TT event (ADD/DEL) + * @bat_priv: the bat priv with all the soft interface information + * @tt_local_entry: the TT entry involved in the event + * @event_flags: flags to store in the event structure + */ +static void batadv_tt_local_event(struct batadv_priv *bat_priv, + struct batadv_tt_local_entry *tt_local_entry, + u8 event_flags) +{ + struct batadv_tt_change_node *tt_change_node, *entry, *safe; + struct batadv_tt_common_entry *common = &tt_local_entry->common; + u8 flags = common->flags | event_flags; + bool event_removed = false; + bool del_op_requested, del_op_entry; + + tt_change_node = kmem_cache_alloc(batadv_tt_change_cache, GFP_ATOMIC); + if (!tt_change_node) + return; + + tt_change_node->change.flags = flags; + memset(tt_change_node->change.reserved, 0, + sizeof(tt_change_node->change.reserved)); + ether_addr_copy(tt_change_node->change.addr, common->addr); + tt_change_node->change.vid = htons(common->vid); + + del_op_requested = flags & BATADV_TT_CLIENT_DEL; + + /* check for ADD+DEL or DEL+ADD events */ + spin_lock_bh(&bat_priv->tt.changes_list_lock); + list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, + list) { + if (!batadv_compare_eth(entry->change.addr, common->addr)) + continue; + + /* DEL+ADD in the same orig interval have no effect and can be + * removed to avoid silly behaviour on the receiver side. The + * other way around (ADD+DEL) can happen in case of roaming of + * a client still in the NEW state. Roaming of NEW clients is + * now possible due to automatically recognition of "temporary" + * clients + */ + del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL; + if (!del_op_requested && del_op_entry) + goto del; + if (del_op_requested && !del_op_entry) + goto del; + + /* this is a second add in the same originator interval. It + * means that flags have been changed: update them! + */ + if (!del_op_requested && !del_op_entry) + entry->change.flags = flags; + + continue; +del: + list_del(&entry->list); + kmem_cache_free(batadv_tt_change_cache, entry); + kmem_cache_free(batadv_tt_change_cache, tt_change_node); + event_removed = true; + goto unlock; + } + + /* track the change in the OGMinterval list */ + list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list); + +unlock: + spin_unlock_bh(&bat_priv->tt.changes_list_lock); + + if (event_removed) + atomic_dec(&bat_priv->tt.local_changes); + else + atomic_inc(&bat_priv->tt.local_changes); +} + +/** + * batadv_tt_len() - compute length in bytes of given number of tt changes + * @changes_num: number of tt changes + * + * Return: computed length in bytes. + */ +static int batadv_tt_len(int changes_num) +{ + return changes_num * sizeof(struct batadv_tvlv_tt_change); +} + +/** + * batadv_tt_entries() - compute the number of entries fitting in tt_len bytes + * @tt_len: available space + * + * Return: the number of entries. + */ +static u16 batadv_tt_entries(u16 tt_len) +{ + return tt_len / batadv_tt_len(1); +} + +/** + * batadv_tt_local_table_transmit_size() - calculates the local translation + * table size when transmitted over the air + * @bat_priv: the bat priv with all the soft interface information + * + * Return: local translation table size in bytes. + */ +static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv) +{ + u16 num_vlan = 0; + u16 tt_local_entries = 0; + struct batadv_softif_vlan *vlan; + int hdr_size; + + rcu_read_lock(); + hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) { + num_vlan++; + tt_local_entries += atomic_read(&vlan->tt.num_entries); + } + rcu_read_unlock(); + + /* header size of tvlv encapsulated tt response payload */ + hdr_size = sizeof(struct batadv_unicast_tvlv_packet); + hdr_size += sizeof(struct batadv_tvlv_hdr); + hdr_size += sizeof(struct batadv_tvlv_tt_data); + hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data); + + return hdr_size + batadv_tt_len(tt_local_entries); +} + +static int batadv_tt_local_init(struct batadv_priv *bat_priv) +{ + if (bat_priv->tt.local_hash) + return 0; + + bat_priv->tt.local_hash = batadv_hash_new(1024); + + if (!bat_priv->tt.local_hash) + return -ENOMEM; + + batadv_hash_set_lock_class(bat_priv->tt.local_hash, + &batadv_tt_local_hash_lock_class_key); + + return 0; +} + +static void batadv_tt_global_free(struct batadv_priv *bat_priv, + struct batadv_tt_global_entry *tt_global, + const char *message) +{ + struct batadv_tt_global_entry *tt_removed_entry; + struct hlist_node *tt_removed_node; + + batadv_dbg(BATADV_DBG_TT, bat_priv, + "Deleting global tt entry %pM (vid: %d): %s\n", + tt_global->common.addr, + batadv_print_vid(tt_global->common.vid), message); + + tt_removed_node = batadv_hash_remove(bat_priv->tt.global_hash, + batadv_compare_tt, + batadv_choose_tt, + &tt_global->common); + if (!tt_removed_node) + return; + + /* drop reference of remove hash entry */ + tt_removed_entry = hlist_entry(tt_removed_node, + struct batadv_tt_global_entry, + common.hash_entry); + batadv_tt_global_entry_put(tt_removed_entry); +} + +/** + * batadv_tt_local_add() - add a new client to the local table or update an + * existing client + * @soft_iface: netdev struct of the mesh interface + * @addr: the mac address of the client to add + * @vid: VLAN identifier + * @ifindex: index of the interface where the client is connected to (useful to + * identify wireless clients) + * @mark: the value contained in the skb->mark field of the received packet (if + * any) + * + * Return: true if the client was successfully added, false otherwise. + */ +bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr, + unsigned short vid, int ifindex, u32 mark) +{ + struct batadv_priv *bat_priv = netdev_priv(soft_iface); + struct batadv_tt_local_entry *tt_local; + struct batadv_tt_global_entry *tt_global = NULL; + struct net *net = dev_net(soft_iface); + struct batadv_softif_vlan *vlan; + struct net_device *in_dev = NULL; + struct batadv_hard_iface *in_hardif = NULL; + struct hlist_head *head; + struct batadv_tt_orig_list_entry *orig_entry; + int hash_added, table_size, packet_size_max; + bool ret = false; + bool roamed_back = false; + u8 remote_flags; + u32 match_mark; + + if (ifindex != BATADV_NULL_IFINDEX) + in_dev = dev_get_by_index(net, ifindex); + + if (in_dev) + in_hardif = batadv_hardif_get_by_netdev(in_dev); + + tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid); + + if (!is_multicast_ether_addr(addr)) + tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid); + + if (tt_local) { + tt_local->last_seen = jiffies; + if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) { + batadv_dbg(BATADV_DBG_TT, bat_priv, + "Re-adding pending client %pM (vid: %d)\n", + addr, batadv_print_vid(vid)); + /* whatever the reason why the PENDING flag was set, + * this is a client which was enqueued to be removed in + * this orig_interval. Since it popped up again, the + * flag can be reset like it was never enqueued + */ + tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING; + goto add_event; + } + + if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) { + batadv_dbg(BATADV_DBG_TT, bat_priv, + "Roaming client %pM (vid: %d) came back to its original location\n", + addr, batadv_print_vid(vid)); + /* the ROAM flag is set because this client roamed away + * and the node got a roaming_advertisement message. Now + * that the client popped up again at its original + * location such flag can be unset + */ + tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM; + roamed_back = true; + } + goto check_roaming; + } + + /* Ignore the client if we cannot send it in a full table response. */ + table_size = batadv_tt_local_table_transmit_size(bat_priv); + table_size += batadv_tt_len(1); + packet_size_max = atomic_read(&bat_priv->packet_size_max); + if (table_size > packet_size_max) { + net_ratelimited_function(batadv_info, soft_iface, + "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n", + table_size, packet_size_max, addr); + goto out; + } + + tt_local = kmem_cache_alloc(batadv_tl_cache, GFP_ATOMIC); + if (!tt_local) + goto out; + + /* increase the refcounter of the related vlan */ + vlan = batadv_softif_vlan_get(bat_priv, vid); + if (!vlan) { + net_ratelimited_function(batadv_info, soft_iface, + "adding TT local entry %pM to non-existent VLAN %d\n", + addr, batadv_print_vid(vid)); + kmem_cache_free(batadv_tl_cache, tt_local); + tt_local = NULL; + goto out; + } + + batadv_dbg(BATADV_DBG_TT, bat_priv, + "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n", + addr, batadv_print_vid(vid), + (u8)atomic_read(&bat_priv->tt.vn)); + + ether_addr_copy(tt_local->common.addr, addr); + /* The local entry has to be marked as NEW to avoid to send it in + * a full table response going out before the next ttvn increment + * (consistency check) + */ + tt_local->common.flags = BATADV_TT_CLIENT_NEW; + tt_local->common.vid = vid; + if (batadv_is_wifi_hardif(in_hardif)) + tt_local->common.flags |= BATADV_TT_CLIENT_WIFI; + kref_init(&tt_local->common.refcount); + tt_local->last_seen = jiffies; + tt_local->common.added_at = tt_local->last_seen; + tt_local->vlan = vlan; + + /* the batman interface mac and multicast addresses should never be + * purged + */ + if (batadv_compare_eth(addr, soft_iface->dev_addr) || + is_multicast_ether_addr(addr)) + tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE; + + kref_get(&tt_local->common.refcount); + hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt, + batadv_choose_tt, &tt_local->common, + &tt_local->common.hash_entry); + + if (unlikely(hash_added != 0)) { + /* remove the reference for the hash */ + batadv_tt_local_entry_put(tt_local); + goto out; + } + +add_event: + batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS); + +check_roaming: + /* Check whether it is a roaming, but don't do anything if the roaming + * process has already been handled + */ + if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) { + /* These node are probably going to update their tt table */ + head = &tt_global->orig_list; + rcu_read_lock(); + hlist_for_each_entry_rcu(orig_entry, head, list) { + batadv_send_roam_adv(bat_priv, tt_global->common.addr, + tt_global->common.vid, + orig_entry->orig_node); + } + rcu_read_unlock(); + if (roamed_back) { + batadv_tt_global_free(bat_priv, tt_global, + "Roaming canceled"); + } else { + /* The global entry has to be marked as ROAMING and + * has to be kept for consistency purpose + */ + tt_global->common.flags |= BATADV_TT_CLIENT_ROAM; + tt_global->roam_at = jiffies; + } + } + + /* store the current remote flags before altering them. This helps + * understanding is flags are changing or not + */ + remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK; + + if (batadv_is_wifi_hardif(in_hardif)) + tt_local->common.flags |= BATADV_TT_CLIENT_WIFI; + else + tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI; + + /* check the mark in the skb: if it's equal to the configured + * isolation_mark, it means the packet is coming from an isolated + * non-mesh client + */ + match_mark = (mark & bat_priv->isolation_mark_mask); + if (bat_priv->isolation_mark_mask && + match_mark == bat_priv->isolation_mark) + tt_local->common.flags |= BATADV_TT_CLIENT_ISOLA; + else + tt_local->common.flags &= ~BATADV_TT_CLIENT_ISOLA; + + /* if any "dynamic" flag has been modified, resend an ADD event for this + * entry so that all the nodes can get the new flags + */ + if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK)) + batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS); + + ret = true; +out: + batadv_hardif_put(in_hardif); + dev_put(in_dev); + batadv_tt_local_entry_put(tt_local); + batadv_tt_global_entry_put(tt_global); + return ret; +} + +/** + * batadv_tt_prepare_tvlv_global_data() - prepare the TVLV TT header to send + * within a TT Response directed to another node + * @orig_node: originator for which the TT data has to be prepared + * @tt_data: uninitialised pointer to the address of the TVLV buffer + * @tt_change: uninitialised pointer to the address of the area where the TT + * changed can be stored + * @tt_len: pointer to the length to reserve to the tt_change. if -1 this + * function reserves the amount of space needed to send the entire global TT + * table. In case of success the value is updated with the real amount of + * reserved bytes + * Allocate the needed amount of memory for the entire TT TVLV and write its + * header made up of one tvlv_tt_data object and a series of tvlv_tt_vlan_data + * objects, one per active VLAN served by the originator node. + * + * Return: the size of the allocated buffer or 0 in case of failure. + */ +static u16 +batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node, + struct batadv_tvlv_tt_data **tt_data, + struct batadv_tvlv_tt_change **tt_change, + s32 *tt_len) +{ + u16 num_vlan = 0; + u16 num_entries = 0; + u16 change_offset; + u16 tvlv_len; + struct batadv_tvlv_tt_vlan_data *tt_vlan; + struct batadv_orig_node_vlan *vlan; + u8 *tt_change_ptr; + + spin_lock_bh(&orig_node->vlan_list_lock); + hlist_for_each_entry(vlan, &orig_node->vlan_list, list) { + num_vlan++; + num_entries += atomic_read(&vlan->tt.num_entries); + } + + change_offset = sizeof(**tt_data); + change_offset += num_vlan * sizeof(*tt_vlan); + + /* if tt_len is negative, allocate the space needed by the full table */ + if (*tt_len < 0) + *tt_len = batadv_tt_len(num_entries); + + tvlv_len = *tt_len; + tvlv_len += change_offset; + + *tt_data = kmalloc(tvlv_len, GFP_ATOMIC); + if (!*tt_data) { + *tt_len = 0; + goto out; + } + + (*tt_data)->flags = BATADV_NO_FLAGS; + (*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn); + (*tt_data)->num_vlan = htons(num_vlan); + + tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1); + hlist_for_each_entry(vlan, &orig_node->vlan_list, list) { + tt_vlan->vid = htons(vlan->vid); + tt_vlan->crc = htonl(vlan->tt.crc); + tt_vlan->reserved = 0; + + tt_vlan++; + } + + tt_change_ptr = (u8 *)*tt_data + change_offset; + *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr; + +out: + spin_unlock_bh(&orig_node->vlan_list_lock); + return tvlv_len; +} + +/** + * batadv_tt_prepare_tvlv_local_data() - allocate and prepare the TT TVLV for + * this node + * @bat_priv: the bat priv with all the soft interface information + * @tt_data: uninitialised pointer to the address of the TVLV buffer + * @tt_change: uninitialised pointer to the address of the area where the TT + * changes can be stored + * @tt_len: pointer to the length to reserve to the tt_change. if -1 this + * function reserves the amount of space needed to send the entire local TT + * table. In case of success the value is updated with the real amount of + * reserved bytes + * + * Allocate the needed amount of memory for the entire TT TVLV and write its + * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data + * objects, one per active VLAN. + * + * Return: the size of the allocated buffer or 0 in case of failure. + */ +static u16 +batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv, + struct batadv_tvlv_tt_data **tt_data, + struct batadv_tvlv_tt_change **tt_change, + s32 *tt_len) +{ + struct batadv_tvlv_tt_vlan_data *tt_vlan; + struct batadv_softif_vlan *vlan; + u16 num_vlan = 0; + u16 vlan_entries = 0; + u16 total_entries = 0; + u16 tvlv_len; + u8 *tt_change_ptr; + int change_offset; + + spin_lock_bh(&bat_priv->softif_vlan_list_lock); + hlist_for_each_entry(vlan, &bat_priv->softif_vlan_list, list) { + vlan_entries = atomic_read(&vlan->tt.num_entries); + if (vlan_entries < 1) + continue; + + num_vlan++; + total_entries += vlan_entries; + } + + change_offset = sizeof(**tt_data); + change_offset += num_vlan * sizeof(*tt_vlan); + + /* if tt_len is negative, allocate the space needed by the full table */ + if (*tt_len < 0) + *tt_len = batadv_tt_len(total_entries); + + tvlv_len = *tt_len; + tvlv_len += change_offset; + + *tt_data = kmalloc(tvlv_len, GFP_ATOMIC); + if (!*tt_data) { + tvlv_len = 0; + goto out; + } + + (*tt_data)->flags = BATADV_NO_FLAGS; + (*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn); + (*tt_data)->num_vlan = htons(num_vlan); + + tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1); + hlist_for_each_entry(vlan, &bat_priv->softif_vlan_list, list) { + vlan_entries = atomic_read(&vlan->tt.num_entries); + if (vlan_entries < 1) + continue; + + tt_vlan->vid = htons(vlan->vid); + tt_vlan->crc = htonl(vlan->tt.crc); + tt_vlan->reserved = 0; + + tt_vlan++; + } + + tt_change_ptr = (u8 *)*tt_data + change_offset; + *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr; + +out: + spin_unlock_bh(&bat_priv->softif_vlan_list_lock); + return tvlv_len; +} + +/** + * batadv_tt_tvlv_container_update() - update the translation table tvlv + * container after local tt changes have been committed + * @bat_priv: the bat priv with all the soft interface information + */ +static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv) +{ + struct batadv_tt_change_node *entry, *safe; + struct batadv_tvlv_tt_data *tt_data; + struct batadv_tvlv_tt_change *tt_change; + int tt_diff_len, tt_change_len = 0; + int tt_diff_entries_num = 0; + int tt_diff_entries_count = 0; + u16 tvlv_len; + + tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes); + tt_diff_len = batadv_tt_len(tt_diff_entries_num); + + /* if we have too many changes for one packet don't send any + * and wait for the tt table request which will be fragmented + */ + if (tt_diff_len > bat_priv->soft_iface->mtu) + tt_diff_len = 0; + + tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data, + &tt_change, &tt_diff_len); + if (!tvlv_len) + return; + + tt_data->flags = BATADV_TT_OGM_DIFF; + + if (tt_diff_len == 0) + goto container_register; + + spin_lock_bh(&bat_priv->tt.changes_list_lock); + atomic_set(&bat_priv->tt.local_changes, 0); + + list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, + list) { + if (tt_diff_entries_count < tt_diff_entries_num) { + memcpy(tt_change + tt_diff_entries_count, + &entry->change, + sizeof(struct batadv_tvlv_tt_change)); + tt_diff_entries_count++; + } + list_del(&entry->list); + kmem_cache_free(batadv_tt_change_cache, entry); + } + spin_unlock_bh(&bat_priv->tt.changes_list_lock); + + /* Keep the buffer for possible tt_request */ + spin_lock_bh(&bat_priv->tt.last_changeset_lock); + kfree(bat_priv->tt.last_changeset); + bat_priv->tt.last_changeset_len = 0; + bat_priv->tt.last_changeset = NULL; + tt_change_len = batadv_tt_len(tt_diff_entries_count); + /* check whether this new OGM has no changes due to size problems */ + if (tt_diff_entries_count > 0) { + /* if kmalloc() fails we will reply with the full table + * instead of providing the diff + */ + bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC); + if (bat_priv->tt.last_changeset) { + memcpy(bat_priv->tt.last_changeset, + tt_change, tt_change_len); + bat_priv->tt.last_changeset_len = tt_diff_len; + } + } + spin_unlock_bh(&bat_priv->tt.last_changeset_lock); + +container_register: + batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data, + tvlv_len); + kfree(tt_data); +} + +/** + * batadv_tt_local_dump_entry() - Dump one TT local entry into a message + * @msg :Netlink message to dump into + * @portid: Port making netlink request + * @cb: Control block containing additional options + * @bat_priv: The bat priv with all the soft interface information + * @common: tt local & tt global common data + * + * Return: Error code, or 0 on success + */ +static int +batadv_tt_local_dump_entry(struct sk_buff *msg, u32 portid, + struct netlink_callback *cb, + struct batadv_priv *bat_priv, + struct batadv_tt_common_entry *common) +{ + void *hdr; + struct batadv_softif_vlan *vlan; + struct batadv_tt_local_entry *local; + unsigned int last_seen_msecs; + u32 crc; + + local = container_of(common, struct batadv_tt_local_entry, common); + last_seen_msecs = jiffies_to_msecs(jiffies - local->last_seen); + + vlan = batadv_softif_vlan_get(bat_priv, common->vid); + if (!vlan) + return 0; + + crc = vlan->tt.crc; + + batadv_softif_vlan_put(vlan); + + hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq, + &batadv_netlink_family, NLM_F_MULTI, + BATADV_CMD_GET_TRANSTABLE_LOCAL); + if (!hdr) + return -ENOBUFS; + + genl_dump_check_consistent(cb, hdr); + + if (nla_put(msg, BATADV_ATTR_TT_ADDRESS, ETH_ALEN, common->addr) || + nla_put_u32(msg, BATADV_ATTR_TT_CRC32, crc) || + nla_put_u16(msg, BATADV_ATTR_TT_VID, common->vid) || + nla_put_u32(msg, BATADV_ATTR_TT_FLAGS, common->flags)) + goto nla_put_failure; + + if (!(common->flags & BATADV_TT_CLIENT_NOPURGE) && + nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, last_seen_msecs)) + goto nla_put_failure; + + genlmsg_end(msg, hdr); + return 0; + + nla_put_failure: + genlmsg_cancel(msg, hdr); + return -EMSGSIZE; +} + +/** + * batadv_tt_local_dump_bucket() - Dump one TT local bucket into a message + * @msg: Netlink message to dump into + * @portid: Port making netlink request + * @cb: Control block containing additional options + * @bat_priv: The bat priv with all the soft interface information + * @hash: hash to dump + * @bucket: bucket index to dump + * @idx_s: Number of entries to skip + * + * Return: Error code, or 0 on success + */ +static int +batadv_tt_local_dump_bucket(struct sk_buff *msg, u32 portid, + struct netlink_callback *cb, + struct batadv_priv *bat_priv, + struct batadv_hashtable *hash, unsigned int bucket, + int *idx_s) +{ + struct batadv_tt_common_entry *common; + int idx = 0; + + spin_lock_bh(&hash->list_locks[bucket]); + cb->seq = atomic_read(&hash->generation) << 1 | 1; + + hlist_for_each_entry(common, &hash->table[bucket], hash_entry) { + if (idx++ < *idx_s) + continue; + + if (batadv_tt_local_dump_entry(msg, portid, cb, bat_priv, + common)) { + spin_unlock_bh(&hash->list_locks[bucket]); + *idx_s = idx - 1; + return -EMSGSIZE; + } + } + spin_unlock_bh(&hash->list_locks[bucket]); + + *idx_s = 0; + return 0; +} + +/** + * batadv_tt_local_dump() - Dump TT local entries into a message + * @msg: Netlink message to dump into + * @cb: Parameters from query + * + * Return: Error code, or 0 on success + */ +int batadv_tt_local_dump(struct sk_buff *msg, struct netlink_callback *cb) +{ + struct net *net = sock_net(cb->skb->sk); + struct net_device *soft_iface; + struct batadv_priv *bat_priv; + struct batadv_hard_iface *primary_if = NULL; + struct batadv_hashtable *hash; + int ret; + int ifindex; + int bucket = cb->args[0]; + int idx = cb->args[1]; + int portid = NETLINK_CB(cb->skb).portid; + + ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX); + if (!ifindex) + return -EINVAL; + + soft_iface = dev_get_by_index(net, ifindex); + if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { + ret = -ENODEV; + goto out; + } + + bat_priv = netdev_priv(soft_iface); + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { + ret = -ENOENT; + goto out; + } + + hash = bat_priv->tt.local_hash; + + while (bucket < hash->size) { + if (batadv_tt_local_dump_bucket(msg, portid, cb, bat_priv, + hash, bucket, &idx)) + break; + + bucket++; + } + + ret = msg->len; + + out: + batadv_hardif_put(primary_if); + dev_put(soft_iface); + + cb->args[0] = bucket; + cb->args[1] = idx; + + return ret; +} + +static void +batadv_tt_local_set_pending(struct batadv_priv *bat_priv, + struct batadv_tt_local_entry *tt_local_entry, + u16 flags, const char *message) +{ + batadv_tt_local_event(bat_priv, tt_local_entry, flags); + + /* The local client has to be marked as "pending to be removed" but has + * to be kept in the table in order to send it in a full table + * response issued before the net ttvn increment (consistency check) + */ + tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING; + + batadv_dbg(BATADV_DBG_TT, bat_priv, + "Local tt entry (%pM, vid: %d) pending to be removed: %s\n", + tt_local_entry->common.addr, + batadv_print_vid(tt_local_entry->common.vid), message); +} + +/** + * batadv_tt_local_remove() - logically remove an entry from the local table + * @bat_priv: the bat priv with all the soft interface information + * @addr: the MAC address of the client to remove + * @vid: VLAN identifier + * @message: message to append to the log on deletion + * @roaming: true if the deletion is due to a roaming event + * + * Return: the flags assigned to the local entry before being deleted + */ +u16 batadv_tt_local_remove(struct batadv_priv *bat_priv, const u8 *addr, + unsigned short vid, const char *message, + bool roaming) +{ + struct batadv_tt_local_entry *tt_removed_entry; + struct batadv_tt_local_entry *tt_local_entry; + u16 flags, curr_flags = BATADV_NO_FLAGS; + struct hlist_node *tt_removed_node; + + tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid); + if (!tt_local_entry) + goto out; + + curr_flags = tt_local_entry->common.flags; + + flags = BATADV_TT_CLIENT_DEL; + /* if this global entry addition is due to a roaming, the node has to + * mark the local entry as "roamed" in order to correctly reroute + * packets later + */ + if (roaming) { + flags |= BATADV_TT_CLIENT_ROAM; + /* mark the local client as ROAMed */ + tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM; + } + + if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) { + batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags, + message); + goto out; + } + /* if this client has been added right now, it is possible to + * immediately purge it + */ + batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL); + + tt_removed_node = batadv_hash_remove(bat_priv->tt.local_hash, + batadv_compare_tt, + batadv_choose_tt, + &tt_local_entry->common); + if (!tt_removed_node) + goto out; + + /* drop reference of remove hash entry */ + tt_removed_entry = hlist_entry(tt_removed_node, + struct batadv_tt_local_entry, + common.hash_entry); + batadv_tt_local_entry_put(tt_removed_entry); + +out: + batadv_tt_local_entry_put(tt_local_entry); + + return curr_flags; +} + +/** + * batadv_tt_local_purge_list() - purge inactive tt local entries + * @bat_priv: the bat priv with all the soft interface information + * @head: pointer to the list containing the local tt entries + * @timeout: parameter deciding whether a given tt local entry is considered + * inactive or not + */ +static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv, + struct hlist_head *head, + int timeout) +{ + struct batadv_tt_local_entry *tt_local_entry; + struct batadv_tt_common_entry *tt_common_entry; + struct hlist_node *node_tmp; + + hlist_for_each_entry_safe(tt_common_entry, node_tmp, head, + hash_entry) { + tt_local_entry = container_of(tt_common_entry, + struct batadv_tt_local_entry, + common); + if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE) + continue; + + /* entry already marked for deletion */ + if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) + continue; + + if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout)) + continue; + + batadv_tt_local_set_pending(bat_priv, tt_local_entry, + BATADV_TT_CLIENT_DEL, "timed out"); + } +} + +/** + * batadv_tt_local_purge() - purge inactive tt local entries + * @bat_priv: the bat priv with all the soft interface information + * @timeout: parameter deciding whether a given tt local entry is considered + * inactive or not + */ +static void batadv_tt_local_purge(struct batadv_priv *bat_priv, + int timeout) +{ + struct batadv_hashtable *hash = bat_priv->tt.local_hash; + struct hlist_head *head; + spinlock_t *list_lock; /* protects write access to the hash lists */ + u32 i; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + list_lock = &hash->list_locks[i]; + + spin_lock_bh(list_lock); + batadv_tt_local_purge_list(bat_priv, head, timeout); + spin_unlock_bh(list_lock); + } +} + +static void batadv_tt_local_table_free(struct batadv_priv *bat_priv) +{ + struct batadv_hashtable *hash; + spinlock_t *list_lock; /* protects write access to the hash lists */ + struct batadv_tt_common_entry *tt_common_entry; + struct batadv_tt_local_entry *tt_local; + struct hlist_node *node_tmp; + struct hlist_head *head; + u32 i; + + if (!bat_priv->tt.local_hash) + return; + + hash = bat_priv->tt.local_hash; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + list_lock = &hash->list_locks[i]; + + spin_lock_bh(list_lock); + hlist_for_each_entry_safe(tt_common_entry, node_tmp, + head, hash_entry) { + hlist_del_rcu(&tt_common_entry->hash_entry); + tt_local = container_of(tt_common_entry, + struct batadv_tt_local_entry, + common); + + batadv_tt_local_entry_put(tt_local); + } + spin_unlock_bh(list_lock); + } + + batadv_hash_destroy(hash); + + bat_priv->tt.local_hash = NULL; +} + +static int batadv_tt_global_init(struct batadv_priv *bat_priv) +{ + if (bat_priv->tt.global_hash) + return 0; + + bat_priv->tt.global_hash = batadv_hash_new(1024); + + if (!bat_priv->tt.global_hash) + return -ENOMEM; + + batadv_hash_set_lock_class(bat_priv->tt.global_hash, + &batadv_tt_global_hash_lock_class_key); + + return 0; +} + +static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv) +{ + struct batadv_tt_change_node *entry, *safe; + + spin_lock_bh(&bat_priv->tt.changes_list_lock); + + list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, + list) { + list_del(&entry->list); + kmem_cache_free(batadv_tt_change_cache, entry); + } + + atomic_set(&bat_priv->tt.local_changes, 0); + spin_unlock_bh(&bat_priv->tt.changes_list_lock); +} + +/** + * batadv_tt_global_orig_entry_find() - find a TT orig_list_entry + * @entry: the TT global entry where the orig_list_entry has to be + * extracted from + * @orig_node: the originator for which the orig_list_entry has to be found + * + * retrieve the orig_tt_list_entry belonging to orig_node from the + * batadv_tt_global_entry list + * + * Return: it with an increased refcounter, NULL if not found + */ +static struct batadv_tt_orig_list_entry * +batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry, + const struct batadv_orig_node *orig_node) +{ + struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL; + const struct hlist_head *head; + + rcu_read_lock(); + head = &entry->orig_list; + hlist_for_each_entry_rcu(tmp_orig_entry, head, list) { + if (tmp_orig_entry->orig_node != orig_node) + continue; + if (!kref_get_unless_zero(&tmp_orig_entry->refcount)) + continue; + + orig_entry = tmp_orig_entry; + break; + } + rcu_read_unlock(); + + return orig_entry; +} + +/** + * batadv_tt_global_entry_has_orig() - check if a TT global entry is also + * handled by a given originator + * @entry: the TT global entry to check + * @orig_node: the originator to search in the list + * @flags: a pointer to store TT flags for the given @entry received + * from @orig_node + * + * find out if an orig_node is already in the list of a tt_global_entry. + * + * Return: true if found, false otherwise + */ +static bool +batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry, + const struct batadv_orig_node *orig_node, + u8 *flags) +{ + struct batadv_tt_orig_list_entry *orig_entry; + bool found = false; + + orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node); + if (orig_entry) { + found = true; + + if (flags) + *flags = orig_entry->flags; + + batadv_tt_orig_list_entry_put(orig_entry); + } + + return found; +} + +/** + * batadv_tt_global_sync_flags() - update TT sync flags + * @tt_global: the TT global entry to update sync flags in + * + * Updates the sync flag bits in the tt_global flag attribute with a logical + * OR of all sync flags from any of its TT orig entries. + */ +static void +batadv_tt_global_sync_flags(struct batadv_tt_global_entry *tt_global) +{ + struct batadv_tt_orig_list_entry *orig_entry; + const struct hlist_head *head; + u16 flags = BATADV_NO_FLAGS; + + rcu_read_lock(); + head = &tt_global->orig_list; + hlist_for_each_entry_rcu(orig_entry, head, list) + flags |= orig_entry->flags; + rcu_read_unlock(); + + flags |= tt_global->common.flags & (~BATADV_TT_SYNC_MASK); + tt_global->common.flags = flags; +} + +/** + * batadv_tt_global_orig_entry_add() - add or update a TT orig entry + * @tt_global: the TT global entry to add an orig entry in + * @orig_node: the originator to add an orig entry for + * @ttvn: translation table version number of this changeset + * @flags: TT sync flags + */ +static void +batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global, + struct batadv_orig_node *orig_node, int ttvn, + u8 flags) +{ + struct batadv_tt_orig_list_entry *orig_entry; + + spin_lock_bh(&tt_global->list_lock); + + orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node); + if (orig_entry) { + /* refresh the ttvn: the current value could be a bogus one that + * was added during a "temporary client detection" + */ + orig_entry->ttvn = ttvn; + orig_entry->flags = flags; + goto sync_flags; + } + + orig_entry = kmem_cache_zalloc(batadv_tt_orig_cache, GFP_ATOMIC); + if (!orig_entry) + goto out; + + INIT_HLIST_NODE(&orig_entry->list); + kref_get(&orig_node->refcount); + batadv_tt_global_size_inc(orig_node, tt_global->common.vid); + orig_entry->orig_node = orig_node; + orig_entry->ttvn = ttvn; + orig_entry->flags = flags; + kref_init(&orig_entry->refcount); + + kref_get(&orig_entry->refcount); + hlist_add_head_rcu(&orig_entry->list, + &tt_global->orig_list); + atomic_inc(&tt_global->orig_list_count); + +sync_flags: + batadv_tt_global_sync_flags(tt_global); +out: + batadv_tt_orig_list_entry_put(orig_entry); + + spin_unlock_bh(&tt_global->list_lock); +} + +/** + * batadv_tt_global_add() - add a new TT global entry or update an existing one + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: the originator announcing the client + * @tt_addr: the mac address of the non-mesh client + * @vid: VLAN identifier + * @flags: TT flags that have to be set for this non-mesh client + * @ttvn: the tt version number ever announcing this non-mesh client + * + * Add a new TT global entry for the given originator. If the entry already + * exists add a new reference to the given originator (a global entry can have + * references to multiple originators) and adjust the flags attribute to reflect + * the function argument. + * If a TT local entry exists for this non-mesh client remove it. + * + * The caller must hold the orig_node refcount. + * + * Return: true if the new entry has been added, false otherwise + */ +static bool batadv_tt_global_add(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + const unsigned char *tt_addr, + unsigned short vid, u16 flags, u8 ttvn) +{ + struct batadv_tt_global_entry *tt_global_entry; + struct batadv_tt_local_entry *tt_local_entry; + bool ret = false; + int hash_added; + struct batadv_tt_common_entry *common; + u16 local_flags; + + /* ignore global entries from backbone nodes */ + if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid)) + return true; + + tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid); + tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid); + + /* if the node already has a local client for this entry, it has to wait + * for a roaming advertisement instead of manually messing up the global + * table + */ + if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry && + !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) + goto out; + + if (!tt_global_entry) { + tt_global_entry = kmem_cache_zalloc(batadv_tg_cache, + GFP_ATOMIC); + if (!tt_global_entry) + goto out; + + common = &tt_global_entry->common; + ether_addr_copy(common->addr, tt_addr); + common->vid = vid; + + if (!is_multicast_ether_addr(common->addr)) + common->flags = flags & (~BATADV_TT_SYNC_MASK); + + tt_global_entry->roam_at = 0; + /* node must store current time in case of roaming. This is + * needed to purge this entry out on timeout (if nobody claims + * it) + */ + if (flags & BATADV_TT_CLIENT_ROAM) + tt_global_entry->roam_at = jiffies; + kref_init(&common->refcount); + common->added_at = jiffies; + + INIT_HLIST_HEAD(&tt_global_entry->orig_list); + atomic_set(&tt_global_entry->orig_list_count, 0); + spin_lock_init(&tt_global_entry->list_lock); + + kref_get(&common->refcount); + hash_added = batadv_hash_add(bat_priv->tt.global_hash, + batadv_compare_tt, + batadv_choose_tt, common, + &common->hash_entry); + + if (unlikely(hash_added != 0)) { + /* remove the reference for the hash */ + batadv_tt_global_entry_put(tt_global_entry); + goto out_remove; + } + } else { + common = &tt_global_entry->common; + /* If there is already a global entry, we can use this one for + * our processing. + * But if we are trying to add a temporary client then here are + * two options at this point: + * 1) the global client is not a temporary client: the global + * client has to be left as it is, temporary information + * should never override any already known client state + * 2) the global client is a temporary client: purge the + * originator list and add the new one orig_entry + */ + if (flags & BATADV_TT_CLIENT_TEMP) { + if (!(common->flags & BATADV_TT_CLIENT_TEMP)) + goto out; + if (batadv_tt_global_entry_has_orig(tt_global_entry, + orig_node, NULL)) + goto out_remove; + batadv_tt_global_del_orig_list(tt_global_entry); + goto add_orig_entry; + } + + /* if the client was temporary added before receiving the first + * OGM announcing it, we have to clear the TEMP flag. Also, + * remove the previous temporary orig node and re-add it + * if required. If the orig entry changed, the new one which + * is a non-temporary entry is preferred. + */ + if (common->flags & BATADV_TT_CLIENT_TEMP) { + batadv_tt_global_del_orig_list(tt_global_entry); + common->flags &= ~BATADV_TT_CLIENT_TEMP; + } + + /* the change can carry possible "attribute" flags like the + * TT_CLIENT_TEMP, therefore they have to be copied in the + * client entry + */ + if (!is_multicast_ether_addr(common->addr)) + common->flags |= flags & (~BATADV_TT_SYNC_MASK); + + /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only + * one originator left in the list and we previously received a + * delete + roaming change for this originator. + * + * We should first delete the old originator before adding the + * new one. + */ + if (common->flags & BATADV_TT_CLIENT_ROAM) { + batadv_tt_global_del_orig_list(tt_global_entry); + common->flags &= ~BATADV_TT_CLIENT_ROAM; + tt_global_entry->roam_at = 0; + } + } +add_orig_entry: + /* add the new orig_entry (if needed) or update it */ + batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn, + flags & BATADV_TT_SYNC_MASK); + + batadv_dbg(BATADV_DBG_TT, bat_priv, + "Creating new global tt entry: %pM (vid: %d, via %pM)\n", + common->addr, batadv_print_vid(common->vid), + orig_node->orig); + ret = true; + +out_remove: + /* Do not remove multicast addresses from the local hash on + * global additions + */ + if (is_multicast_ether_addr(tt_addr)) + goto out; + + /* remove address from local hash if present */ + local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid, + "global tt received", + flags & BATADV_TT_CLIENT_ROAM); + tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI; + + if (!(flags & BATADV_TT_CLIENT_ROAM)) + /* this is a normal global add. Therefore the client is not in a + * roaming state anymore. + */ + tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM; + +out: + batadv_tt_global_entry_put(tt_global_entry); + batadv_tt_local_entry_put(tt_local_entry); + return ret; +} + +/** + * batadv_transtable_best_orig() - Get best originator list entry from tt entry + * @bat_priv: the bat priv with all the soft interface information + * @tt_global_entry: global translation table entry to be analyzed + * + * This function assumes the caller holds rcu_read_lock(). + * Return: best originator list entry or NULL on errors. + */ +static struct batadv_tt_orig_list_entry * +batadv_transtable_best_orig(struct batadv_priv *bat_priv, + struct batadv_tt_global_entry *tt_global_entry) +{ + struct batadv_neigh_node *router, *best_router = NULL; + struct batadv_algo_ops *bao = bat_priv->algo_ops; + struct hlist_head *head; + struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL; + + head = &tt_global_entry->orig_list; + hlist_for_each_entry_rcu(orig_entry, head, list) { + router = batadv_orig_router_get(orig_entry->orig_node, + BATADV_IF_DEFAULT); + if (!router) + continue; + + if (best_router && + bao->neigh.cmp(router, BATADV_IF_DEFAULT, best_router, + BATADV_IF_DEFAULT) <= 0) { + batadv_neigh_node_put(router); + continue; + } + + /* release the refcount for the "old" best */ + batadv_neigh_node_put(best_router); + + best_entry = orig_entry; + best_router = router; + } + + batadv_neigh_node_put(best_router); + + return best_entry; +} + +/** + * batadv_tt_global_dump_subentry() - Dump all TT local entries into a message + * @msg: Netlink message to dump into + * @portid: Port making netlink request + * @seq: Sequence number of netlink message + * @common: tt local & tt global common data + * @orig: Originator node announcing a non-mesh client + * @best: Is the best originator for the TT entry + * + * Return: Error code, or 0 on success + */ +static int +batadv_tt_global_dump_subentry(struct sk_buff *msg, u32 portid, u32 seq, + struct batadv_tt_common_entry *common, + struct batadv_tt_orig_list_entry *orig, + bool best) +{ + u16 flags = (common->flags & (~BATADV_TT_SYNC_MASK)) | orig->flags; + void *hdr; + struct batadv_orig_node_vlan *vlan; + u8 last_ttvn; + u32 crc; + + vlan = batadv_orig_node_vlan_get(orig->orig_node, + common->vid); + if (!vlan) + return 0; + + crc = vlan->tt.crc; + + batadv_orig_node_vlan_put(vlan); + + hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, + NLM_F_MULTI, + BATADV_CMD_GET_TRANSTABLE_GLOBAL); + if (!hdr) + return -ENOBUFS; + + last_ttvn = atomic_read(&orig->orig_node->last_ttvn); + + if (nla_put(msg, BATADV_ATTR_TT_ADDRESS, ETH_ALEN, common->addr) || + nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, + orig->orig_node->orig) || + nla_put_u8(msg, BATADV_ATTR_TT_TTVN, orig->ttvn) || + nla_put_u8(msg, BATADV_ATTR_TT_LAST_TTVN, last_ttvn) || + nla_put_u32(msg, BATADV_ATTR_TT_CRC32, crc) || + nla_put_u16(msg, BATADV_ATTR_TT_VID, common->vid) || + nla_put_u32(msg, BATADV_ATTR_TT_FLAGS, flags)) + goto nla_put_failure; + + if (best && nla_put_flag(msg, BATADV_ATTR_FLAG_BEST)) + goto nla_put_failure; + + genlmsg_end(msg, hdr); + return 0; + + nla_put_failure: + genlmsg_cancel(msg, hdr); + return -EMSGSIZE; +} + +/** + * batadv_tt_global_dump_entry() - Dump one TT global entry into a message + * @msg: Netlink message to dump into + * @portid: Port making netlink request + * @seq: Sequence number of netlink message + * @bat_priv: The bat priv with all the soft interface information + * @common: tt local & tt global common data + * @sub_s: Number of entries to skip + * + * This function assumes the caller holds rcu_read_lock(). + * + * Return: Error code, or 0 on success + */ +static int +batadv_tt_global_dump_entry(struct sk_buff *msg, u32 portid, u32 seq, + struct batadv_priv *bat_priv, + struct batadv_tt_common_entry *common, int *sub_s) +{ + struct batadv_tt_orig_list_entry *orig_entry, *best_entry; + struct batadv_tt_global_entry *global; + struct hlist_head *head; + int sub = 0; + bool best; + + global = container_of(common, struct batadv_tt_global_entry, common); + best_entry = batadv_transtable_best_orig(bat_priv, global); + head = &global->orig_list; + + hlist_for_each_entry_rcu(orig_entry, head, list) { + if (sub++ < *sub_s) + continue; + + best = (orig_entry == best_entry); + + if (batadv_tt_global_dump_subentry(msg, portid, seq, common, + orig_entry, best)) { + *sub_s = sub - 1; + return -EMSGSIZE; + } + } + + *sub_s = 0; + return 0; +} + +/** + * batadv_tt_global_dump_bucket() - Dump one TT local bucket into a message + * @msg: Netlink message to dump into + * @portid: Port making netlink request + * @seq: Sequence number of netlink message + * @bat_priv: The bat priv with all the soft interface information + * @head: Pointer to the list containing the global tt entries + * @idx_s: Number of entries to skip + * @sub: Number of entries to skip + * + * Return: Error code, or 0 on success + */ +static int +batadv_tt_global_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq, + struct batadv_priv *bat_priv, + struct hlist_head *head, int *idx_s, int *sub) +{ + struct batadv_tt_common_entry *common; + int idx = 0; + + rcu_read_lock(); + hlist_for_each_entry_rcu(common, head, hash_entry) { + if (idx++ < *idx_s) + continue; + + if (batadv_tt_global_dump_entry(msg, portid, seq, bat_priv, + common, sub)) { + rcu_read_unlock(); + *idx_s = idx - 1; + return -EMSGSIZE; + } + } + rcu_read_unlock(); + + *idx_s = 0; + *sub = 0; + return 0; +} + +/** + * batadv_tt_global_dump() - Dump TT global entries into a message + * @msg: Netlink message to dump into + * @cb: Parameters from query + * + * Return: Error code, or length of message on success + */ +int batadv_tt_global_dump(struct sk_buff *msg, struct netlink_callback *cb) +{ + struct net *net = sock_net(cb->skb->sk); + struct net_device *soft_iface; + struct batadv_priv *bat_priv; + struct batadv_hard_iface *primary_if = NULL; + struct batadv_hashtable *hash; + struct hlist_head *head; + int ret; + int ifindex; + int bucket = cb->args[0]; + int idx = cb->args[1]; + int sub = cb->args[2]; + int portid = NETLINK_CB(cb->skb).portid; + + ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX); + if (!ifindex) + return -EINVAL; + + soft_iface = dev_get_by_index(net, ifindex); + if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { + ret = -ENODEV; + goto out; + } + + bat_priv = netdev_priv(soft_iface); + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { + ret = -ENOENT; + goto out; + } + + hash = bat_priv->tt.global_hash; + + while (bucket < hash->size) { + head = &hash->table[bucket]; + + if (batadv_tt_global_dump_bucket(msg, portid, + cb->nlh->nlmsg_seq, bat_priv, + head, &idx, &sub)) + break; + + bucket++; + } + + ret = msg->len; + + out: + batadv_hardif_put(primary_if); + dev_put(soft_iface); + + cb->args[0] = bucket; + cb->args[1] = idx; + cb->args[2] = sub; + + return ret; +} + +/** + * _batadv_tt_global_del_orig_entry() - remove and free an orig_entry + * @tt_global_entry: the global entry to remove the orig_entry from + * @orig_entry: the orig entry to remove and free + * + * Remove an orig_entry from its list in the given tt_global_entry and + * free this orig_entry afterwards. + * + * Caller must hold tt_global_entry->list_lock and ensure orig_entry->list is + * part of a list. + */ +static void +_batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry, + struct batadv_tt_orig_list_entry *orig_entry) +{ + lockdep_assert_held(&tt_global_entry->list_lock); + + batadv_tt_global_size_dec(orig_entry->orig_node, + tt_global_entry->common.vid); + atomic_dec(&tt_global_entry->orig_list_count); + /* requires holding tt_global_entry->list_lock and orig_entry->list + * being part of a list + */ + hlist_del_rcu(&orig_entry->list); + batadv_tt_orig_list_entry_put(orig_entry); +} + +/* deletes the orig list of a tt_global_entry */ +static void +batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry) +{ + struct hlist_head *head; + struct hlist_node *safe; + struct batadv_tt_orig_list_entry *orig_entry; + + spin_lock_bh(&tt_global_entry->list_lock); + head = &tt_global_entry->orig_list; + hlist_for_each_entry_safe(orig_entry, safe, head, list) + _batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry); + spin_unlock_bh(&tt_global_entry->list_lock); +} + +/** + * batadv_tt_global_del_orig_node() - remove orig_node from a global tt entry + * @bat_priv: the bat priv with all the soft interface information + * @tt_global_entry: the global entry to remove the orig_node from + * @orig_node: the originator announcing the client + * @message: message to append to the log on deletion + * + * Remove the given orig_node and its according orig_entry from the given + * global tt entry. + */ +static void +batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv, + struct batadv_tt_global_entry *tt_global_entry, + struct batadv_orig_node *orig_node, + const char *message) +{ + struct hlist_head *head; + struct hlist_node *safe; + struct batadv_tt_orig_list_entry *orig_entry; + unsigned short vid; + + spin_lock_bh(&tt_global_entry->list_lock); + head = &tt_global_entry->orig_list; + hlist_for_each_entry_safe(orig_entry, safe, head, list) { + if (orig_entry->orig_node == orig_node) { + vid = tt_global_entry->common.vid; + batadv_dbg(BATADV_DBG_TT, bat_priv, + "Deleting %pM from global tt entry %pM (vid: %d): %s\n", + orig_node->orig, + tt_global_entry->common.addr, + batadv_print_vid(vid), message); + _batadv_tt_global_del_orig_entry(tt_global_entry, + orig_entry); + } + } + spin_unlock_bh(&tt_global_entry->list_lock); +} + +/* If the client is to be deleted, we check if it is the last origantor entry + * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the + * timer, otherwise we simply remove the originator scheduled for deletion. + */ +static void +batadv_tt_global_del_roaming(struct batadv_priv *bat_priv, + struct batadv_tt_global_entry *tt_global_entry, + struct batadv_orig_node *orig_node, + const char *message) +{ + bool last_entry = true; + struct hlist_head *head; + struct batadv_tt_orig_list_entry *orig_entry; + + /* no local entry exists, case 1: + * Check if this is the last one or if other entries exist. + */ + + rcu_read_lock(); + head = &tt_global_entry->orig_list; + hlist_for_each_entry_rcu(orig_entry, head, list) { + if (orig_entry->orig_node != orig_node) { + last_entry = false; + break; + } + } + rcu_read_unlock(); + + if (last_entry) { + /* its the last one, mark for roaming. */ + tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM; + tt_global_entry->roam_at = jiffies; + } else { + /* there is another entry, we can simply delete this + * one and can still use the other one. + */ + batadv_tt_global_del_orig_node(bat_priv, tt_global_entry, + orig_node, message); + } +} + +/** + * batadv_tt_global_del() - remove a client from the global table + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: an originator serving this client + * @addr: the mac address of the client + * @vid: VLAN identifier + * @message: a message explaining the reason for deleting the client to print + * for debugging purpose + * @roaming: true if the deletion has been triggered by a roaming event + */ +static void batadv_tt_global_del(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + const unsigned char *addr, unsigned short vid, + const char *message, bool roaming) +{ + struct batadv_tt_global_entry *tt_global_entry; + struct batadv_tt_local_entry *local_entry = NULL; + + tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid); + if (!tt_global_entry) + goto out; + + if (!roaming) { + batadv_tt_global_del_orig_node(bat_priv, tt_global_entry, + orig_node, message); + + if (hlist_empty(&tt_global_entry->orig_list)) + batadv_tt_global_free(bat_priv, tt_global_entry, + message); + + goto out; + } + + /* if we are deleting a global entry due to a roam + * event, there are two possibilities: + * 1) the client roamed from node A to node B => if there + * is only one originator left for this client, we mark + * it with BATADV_TT_CLIENT_ROAM, we start a timer and we + * wait for node B to claim it. In case of timeout + * the entry is purged. + * + * If there are other originators left, we directly delete + * the originator. + * 2) the client roamed to us => we can directly delete + * the global entry, since it is useless now. + */ + local_entry = batadv_tt_local_hash_find(bat_priv, + tt_global_entry->common.addr, + vid); + if (local_entry) { + /* local entry exists, case 2: client roamed to us. */ + batadv_tt_global_del_orig_list(tt_global_entry); + batadv_tt_global_free(bat_priv, tt_global_entry, message); + } else { + /* no local entry exists, case 1: check for roaming */ + batadv_tt_global_del_roaming(bat_priv, tt_global_entry, + orig_node, message); + } + +out: + batadv_tt_global_entry_put(tt_global_entry); + batadv_tt_local_entry_put(local_entry); +} + +/** + * batadv_tt_global_del_orig() - remove all the TT global entries belonging to + * the given originator matching the provided vid + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: the originator owning the entries to remove + * @match_vid: the VLAN identifier to match. If negative all the entries will be + * removed + * @message: debug message to print as "reason" + */ +void batadv_tt_global_del_orig(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + s32 match_vid, + const char *message) +{ + struct batadv_tt_global_entry *tt_global; + struct batadv_tt_common_entry *tt_common_entry; + u32 i; + struct batadv_hashtable *hash = bat_priv->tt.global_hash; + struct hlist_node *safe; + struct hlist_head *head; + spinlock_t *list_lock; /* protects write access to the hash lists */ + unsigned short vid; + + if (!hash) + return; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + list_lock = &hash->list_locks[i]; + + spin_lock_bh(list_lock); + hlist_for_each_entry_safe(tt_common_entry, safe, + head, hash_entry) { + /* remove only matching entries */ + if (match_vid >= 0 && tt_common_entry->vid != match_vid) + continue; + + tt_global = container_of(tt_common_entry, + struct batadv_tt_global_entry, + common); + + batadv_tt_global_del_orig_node(bat_priv, tt_global, + orig_node, message); + + if (hlist_empty(&tt_global->orig_list)) { + vid = tt_global->common.vid; + batadv_dbg(BATADV_DBG_TT, bat_priv, + "Deleting global tt entry %pM (vid: %d): %s\n", + tt_global->common.addr, + batadv_print_vid(vid), message); + hlist_del_rcu(&tt_common_entry->hash_entry); + batadv_tt_global_entry_put(tt_global); + } + } + spin_unlock_bh(list_lock); + } + clear_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized); +} + +static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global, + char **msg) +{ + bool purge = false; + unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT; + unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT; + + if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) && + batadv_has_timed_out(tt_global->roam_at, roam_timeout)) { + purge = true; + *msg = "Roaming timeout\n"; + } + + if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) && + batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) { + purge = true; + *msg = "Temporary client timeout\n"; + } + + return purge; +} + +static void batadv_tt_global_purge(struct batadv_priv *bat_priv) +{ + struct batadv_hashtable *hash = bat_priv->tt.global_hash; + struct hlist_head *head; + struct hlist_node *node_tmp; + spinlock_t *list_lock; /* protects write access to the hash lists */ + u32 i; + char *msg = NULL; + struct batadv_tt_common_entry *tt_common; + struct batadv_tt_global_entry *tt_global; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + list_lock = &hash->list_locks[i]; + + spin_lock_bh(list_lock); + hlist_for_each_entry_safe(tt_common, node_tmp, head, + hash_entry) { + tt_global = container_of(tt_common, + struct batadv_tt_global_entry, + common); + + if (!batadv_tt_global_to_purge(tt_global, &msg)) + continue; + + batadv_dbg(BATADV_DBG_TT, bat_priv, + "Deleting global tt entry %pM (vid: %d): %s\n", + tt_global->common.addr, + batadv_print_vid(tt_global->common.vid), + msg); + + hlist_del_rcu(&tt_common->hash_entry); + + batadv_tt_global_entry_put(tt_global); + } + spin_unlock_bh(list_lock); + } +} + +static void batadv_tt_global_table_free(struct batadv_priv *bat_priv) +{ + struct batadv_hashtable *hash; + spinlock_t *list_lock; /* protects write access to the hash lists */ + struct batadv_tt_common_entry *tt_common_entry; + struct batadv_tt_global_entry *tt_global; + struct hlist_node *node_tmp; + struct hlist_head *head; + u32 i; + + if (!bat_priv->tt.global_hash) + return; + + hash = bat_priv->tt.global_hash; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + list_lock = &hash->list_locks[i]; + + spin_lock_bh(list_lock); + hlist_for_each_entry_safe(tt_common_entry, node_tmp, + head, hash_entry) { + hlist_del_rcu(&tt_common_entry->hash_entry); + tt_global = container_of(tt_common_entry, + struct batadv_tt_global_entry, + common); + batadv_tt_global_entry_put(tt_global); + } + spin_unlock_bh(list_lock); + } + + batadv_hash_destroy(hash); + + bat_priv->tt.global_hash = NULL; +} + +static bool +_batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry, + struct batadv_tt_global_entry *tt_global_entry) +{ + if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI && + tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI) + return true; + + /* check if the two clients are marked as isolated */ + if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA && + tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA) + return true; + + return false; +} + +/** + * batadv_transtable_search() - get the mesh destination for a given client + * @bat_priv: the bat priv with all the soft interface information + * @src: mac address of the source client + * @addr: mac address of the destination client + * @vid: VLAN identifier + * + * Return: a pointer to the originator that was selected as destination in the + * mesh for contacting the client 'addr', NULL otherwise. + * In case of multiple originators serving the same client, the function returns + * the best one (best in terms of metric towards the destination node). + * + * If the two clients are AP isolated the function returns NULL. + */ +struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv, + const u8 *src, + const u8 *addr, + unsigned short vid) +{ + struct batadv_tt_local_entry *tt_local_entry = NULL; + struct batadv_tt_global_entry *tt_global_entry = NULL; + struct batadv_orig_node *orig_node = NULL; + struct batadv_tt_orig_list_entry *best_entry; + + if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) { + tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid); + if (!tt_local_entry || + (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)) + goto out; + } + + tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid); + if (!tt_global_entry) + goto out; + + /* check whether the clients should not communicate due to AP + * isolation + */ + if (tt_local_entry && + _batadv_is_ap_isolated(tt_local_entry, tt_global_entry)) + goto out; + + rcu_read_lock(); + best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry); + /* found anything? */ + if (best_entry) + orig_node = best_entry->orig_node; + if (orig_node && !kref_get_unless_zero(&orig_node->refcount)) + orig_node = NULL; + rcu_read_unlock(); + +out: + batadv_tt_global_entry_put(tt_global_entry); + batadv_tt_local_entry_put(tt_local_entry); + + return orig_node; +} + +/** + * batadv_tt_global_crc() - calculates the checksum of the local table belonging + * to the given orig_node + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: originator for which the CRC should be computed + * @vid: VLAN identifier for which the CRC32 has to be computed + * + * This function computes the checksum for the global table corresponding to a + * specific originator. In particular, the checksum is computed as follows: For + * each client connected to the originator the CRC32C of the MAC address and the + * VID is computed and then all the CRC32Cs of the various clients are xor'ed + * together. + * + * The idea behind is that CRC32C should be used as much as possible in order to + * produce a unique hash of the table, but since the order which is used to feed + * the CRC32C function affects the result and since every node in the network + * probably sorts the clients differently, the hash function cannot be directly + * computed over the entire table. Hence the CRC32C is used only on + * the single client entry, while all the results are then xor'ed together + * because the XOR operation can combine them all while trying to reduce the + * noise as much as possible. + * + * Return: the checksum of the global table of a given originator. + */ +static u32 batadv_tt_global_crc(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + unsigned short vid) +{ + struct batadv_hashtable *hash = bat_priv->tt.global_hash; + struct batadv_tt_orig_list_entry *tt_orig; + struct batadv_tt_common_entry *tt_common; + struct batadv_tt_global_entry *tt_global; + struct hlist_head *head; + u32 i, crc_tmp, crc = 0; + u8 flags; + __be16 tmp_vid; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + rcu_read_lock(); + hlist_for_each_entry_rcu(tt_common, head, hash_entry) { + tt_global = container_of(tt_common, + struct batadv_tt_global_entry, + common); + /* compute the CRC only for entries belonging to the + * VLAN identified by the vid passed as parameter + */ + if (tt_common->vid != vid) + continue; + + /* Roaming clients are in the global table for + * consistency only. They don't have to be + * taken into account while computing the + * global crc + */ + if (tt_common->flags & BATADV_TT_CLIENT_ROAM) + continue; + /* Temporary clients have not been announced yet, so + * they have to be skipped while computing the global + * crc + */ + if (tt_common->flags & BATADV_TT_CLIENT_TEMP) + continue; + + /* find out if this global entry is announced by this + * originator + */ + tt_orig = batadv_tt_global_orig_entry_find(tt_global, + orig_node); + if (!tt_orig) + continue; + + /* use network order to read the VID: this ensures that + * every node reads the bytes in the same order. + */ + tmp_vid = htons(tt_common->vid); + crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid)); + + /* compute the CRC on flags that have to be kept in sync + * among nodes + */ + flags = tt_orig->flags; + crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags)); + + crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN); + + batadv_tt_orig_list_entry_put(tt_orig); + } + rcu_read_unlock(); + } + + return crc; +} + +/** + * batadv_tt_local_crc() - calculates the checksum of the local table + * @bat_priv: the bat priv with all the soft interface information + * @vid: VLAN identifier for which the CRC32 has to be computed + * + * For details about the computation, please refer to the documentation for + * batadv_tt_global_crc(). + * + * Return: the checksum of the local table + */ +static u32 batadv_tt_local_crc(struct batadv_priv *bat_priv, + unsigned short vid) +{ + struct batadv_hashtable *hash = bat_priv->tt.local_hash; + struct batadv_tt_common_entry *tt_common; + struct hlist_head *head; + u32 i, crc_tmp, crc = 0; + u8 flags; + __be16 tmp_vid; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + rcu_read_lock(); + hlist_for_each_entry_rcu(tt_common, head, hash_entry) { + /* compute the CRC only for entries belonging to the + * VLAN identified by vid + */ + if (tt_common->vid != vid) + continue; + + /* not yet committed clients have not to be taken into + * account while computing the CRC + */ + if (tt_common->flags & BATADV_TT_CLIENT_NEW) + continue; + + /* use network order to read the VID: this ensures that + * every node reads the bytes in the same order. + */ + tmp_vid = htons(tt_common->vid); + crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid)); + + /* compute the CRC on flags that have to be kept in sync + * among nodes + */ + flags = tt_common->flags & BATADV_TT_SYNC_MASK; + crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags)); + + crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN); + } + rcu_read_unlock(); + } + + return crc; +} + +/** + * batadv_tt_req_node_release() - free tt_req node entry + * @ref: kref pointer of the tt req_node entry + */ +static void batadv_tt_req_node_release(struct kref *ref) +{ + struct batadv_tt_req_node *tt_req_node; + + tt_req_node = container_of(ref, struct batadv_tt_req_node, refcount); + + kmem_cache_free(batadv_tt_req_cache, tt_req_node); +} + +/** + * batadv_tt_req_node_put() - decrement the tt_req_node refcounter and + * possibly release it + * @tt_req_node: tt_req_node to be free'd + */ +static void batadv_tt_req_node_put(struct batadv_tt_req_node *tt_req_node) +{ + if (!tt_req_node) + return; + + kref_put(&tt_req_node->refcount, batadv_tt_req_node_release); +} + +static void batadv_tt_req_list_free(struct batadv_priv *bat_priv) +{ + struct batadv_tt_req_node *node; + struct hlist_node *safe; + + spin_lock_bh(&bat_priv->tt.req_list_lock); + + hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { + hlist_del_init(&node->list); + batadv_tt_req_node_put(node); + } + + spin_unlock_bh(&bat_priv->tt.req_list_lock); +} + +static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + const void *tt_buff, + u16 tt_buff_len) +{ + /* Replace the old buffer only if I received something in the + * last OGM (the OGM could carry no changes) + */ + spin_lock_bh(&orig_node->tt_buff_lock); + if (tt_buff_len > 0) { + kfree(orig_node->tt_buff); + orig_node->tt_buff_len = 0; + orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC); + if (orig_node->tt_buff) { + memcpy(orig_node->tt_buff, tt_buff, tt_buff_len); + orig_node->tt_buff_len = tt_buff_len; + } + } + spin_unlock_bh(&orig_node->tt_buff_lock); +} + +static void batadv_tt_req_purge(struct batadv_priv *bat_priv) +{ + struct batadv_tt_req_node *node; + struct hlist_node *safe; + + spin_lock_bh(&bat_priv->tt.req_list_lock); + hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { + if (batadv_has_timed_out(node->issued_at, + BATADV_TT_REQUEST_TIMEOUT)) { + hlist_del_init(&node->list); + batadv_tt_req_node_put(node); + } + } + spin_unlock_bh(&bat_priv->tt.req_list_lock); +} + +/** + * batadv_tt_req_node_new() - search and possibly create a tt_req_node object + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: orig node this request is being issued for + * + * Return: the pointer to the new tt_req_node struct if no request + * has already been issued for this orig_node, NULL otherwise. + */ +static struct batadv_tt_req_node * +batadv_tt_req_node_new(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node) +{ + struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL; + + spin_lock_bh(&bat_priv->tt.req_list_lock); + hlist_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) { + if (batadv_compare_eth(tt_req_node_tmp, orig_node) && + !batadv_has_timed_out(tt_req_node_tmp->issued_at, + BATADV_TT_REQUEST_TIMEOUT)) + goto unlock; + } + + tt_req_node = kmem_cache_alloc(batadv_tt_req_cache, GFP_ATOMIC); + if (!tt_req_node) + goto unlock; + + kref_init(&tt_req_node->refcount); + ether_addr_copy(tt_req_node->addr, orig_node->orig); + tt_req_node->issued_at = jiffies; + + kref_get(&tt_req_node->refcount); + hlist_add_head(&tt_req_node->list, &bat_priv->tt.req_list); +unlock: + spin_unlock_bh(&bat_priv->tt.req_list_lock); + return tt_req_node; +} + +/** + * batadv_tt_local_valid() - verify local tt entry and get flags + * @entry_ptr: to be checked local tt entry + * @data_ptr: not used but definition required to satisfy the callback prototype + * @flags: a pointer to store TT flags for this client to + * + * Checks the validity of the given local TT entry. If it is, then the provided + * flags pointer is updated. + * + * Return: true if the entry is a valid, false otherwise. + */ +static bool batadv_tt_local_valid(const void *entry_ptr, + const void *data_ptr, + u8 *flags) +{ + const struct batadv_tt_common_entry *tt_common_entry = entry_ptr; + + if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW) + return false; + + if (flags) + *flags = tt_common_entry->flags; + + return true; +} + +/** + * batadv_tt_global_valid() - verify global tt entry and get flags + * @entry_ptr: to be checked global tt entry + * @data_ptr: an orig_node object (may be NULL) + * @flags: a pointer to store TT flags for this client to + * + * Checks the validity of the given global TT entry. If it is, then the provided + * flags pointer is updated either with the common (summed) TT flags if data_ptr + * is NULL or the specific, per originator TT flags otherwise. + * + * Return: true if the entry is a valid, false otherwise. + */ +static bool batadv_tt_global_valid(const void *entry_ptr, + const void *data_ptr, + u8 *flags) +{ + const struct batadv_tt_common_entry *tt_common_entry = entry_ptr; + const struct batadv_tt_global_entry *tt_global_entry; + const struct batadv_orig_node *orig_node = data_ptr; + + if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM || + tt_common_entry->flags & BATADV_TT_CLIENT_TEMP) + return false; + + tt_global_entry = container_of(tt_common_entry, + struct batadv_tt_global_entry, + common); + + return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node, + flags); +} + +/** + * batadv_tt_tvlv_generate() - fill the tvlv buff with the tt entries from the + * specified tt hash + * @bat_priv: the bat priv with all the soft interface information + * @hash: hash table containing the tt entries + * @tt_len: expected tvlv tt data buffer length in number of bytes + * @tvlv_buff: pointer to the buffer to fill with the TT data + * @valid_cb: function to filter tt change entries and to return TT flags + * @cb_data: data passed to the filter function as argument + * + * Fills the tvlv buff with the tt entries from the specified hash. If valid_cb + * is not provided then this becomes a no-op. + */ +static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv, + struct batadv_hashtable *hash, + void *tvlv_buff, u16 tt_len, + bool (*valid_cb)(const void *, + const void *, + u8 *flags), + void *cb_data) +{ + struct batadv_tt_common_entry *tt_common_entry; + struct batadv_tvlv_tt_change *tt_change; + struct hlist_head *head; + u16 tt_tot, tt_num_entries = 0; + u8 flags; + bool ret; + u32 i; + + tt_tot = batadv_tt_entries(tt_len); + tt_change = tvlv_buff; + + if (!valid_cb) + return; + + rcu_read_lock(); + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + hlist_for_each_entry_rcu(tt_common_entry, + head, hash_entry) { + if (tt_tot == tt_num_entries) + break; + + ret = valid_cb(tt_common_entry, cb_data, &flags); + if (!ret) + continue; + + ether_addr_copy(tt_change->addr, tt_common_entry->addr); + tt_change->flags = flags; + tt_change->vid = htons(tt_common_entry->vid); + memset(tt_change->reserved, 0, + sizeof(tt_change->reserved)); + + tt_num_entries++; + tt_change++; + } + } + rcu_read_unlock(); +} + +/** + * batadv_tt_global_check_crc() - check if all the CRCs are correct + * @orig_node: originator for which the CRCs have to be checked + * @tt_vlan: pointer to the first tvlv VLAN entry + * @num_vlan: number of tvlv VLAN entries + * + * Return: true if all the received CRCs match the locally stored ones, false + * otherwise + */ +static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node, + struct batadv_tvlv_tt_vlan_data *tt_vlan, + u16 num_vlan) +{ + struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp; + struct batadv_orig_node_vlan *vlan; + int i, orig_num_vlan; + u32 crc; + + /* check if each received CRC matches the locally stored one */ + for (i = 0; i < num_vlan; i++) { + tt_vlan_tmp = tt_vlan + i; + + /* if orig_node is a backbone node for this VLAN, don't check + * the CRC as we ignore all the global entries over it + */ + if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv, + orig_node->orig, + ntohs(tt_vlan_tmp->vid))) + continue; + + vlan = batadv_orig_node_vlan_get(orig_node, + ntohs(tt_vlan_tmp->vid)); + if (!vlan) + return false; + + crc = vlan->tt.crc; + batadv_orig_node_vlan_put(vlan); + + if (crc != ntohl(tt_vlan_tmp->crc)) + return false; + } + + /* check if any excess VLANs exist locally for the originator + * which are not mentioned in the TVLV from the originator. + */ + rcu_read_lock(); + orig_num_vlan = 0; + hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) + orig_num_vlan++; + rcu_read_unlock(); + + if (orig_num_vlan > num_vlan) + return false; + + return true; +} + +/** + * batadv_tt_local_update_crc() - update all the local CRCs + * @bat_priv: the bat priv with all the soft interface information + */ +static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv) +{ + struct batadv_softif_vlan *vlan; + + /* recompute the global CRC for each VLAN */ + rcu_read_lock(); + hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) { + vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid); + } + rcu_read_unlock(); +} + +/** + * batadv_tt_global_update_crc() - update all the global CRCs for this orig_node + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: the orig_node for which the CRCs have to be updated + */ +static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node) +{ + struct batadv_orig_node_vlan *vlan; + u32 crc; + + /* recompute the global CRC for each VLAN */ + rcu_read_lock(); + hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) { + /* if orig_node is a backbone node for this VLAN, don't compute + * the CRC as we ignore all the global entries over it + */ + if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, + vlan->vid)) + continue; + + crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid); + vlan->tt.crc = crc; + } + rcu_read_unlock(); +} + +/** + * batadv_send_tt_request() - send a TT Request message to a given node + * @bat_priv: the bat priv with all the soft interface information + * @dst_orig_node: the destination of the message + * @ttvn: the version number that the source of the message is looking for + * @tt_vlan: pointer to the first tvlv VLAN object to request + * @num_vlan: number of tvlv VLAN entries + * @full_table: ask for the entire translation table if true, while only for the + * last TT diff otherwise + * + * Return: true if the TT Request was sent, false otherwise + */ +static bool batadv_send_tt_request(struct batadv_priv *bat_priv, + struct batadv_orig_node *dst_orig_node, + u8 ttvn, + struct batadv_tvlv_tt_vlan_data *tt_vlan, + u16 num_vlan, bool full_table) +{ + struct batadv_tvlv_tt_data *tvlv_tt_data = NULL; + struct batadv_tt_req_node *tt_req_node = NULL; + struct batadv_tvlv_tt_vlan_data *tt_vlan_req; + struct batadv_hard_iface *primary_if; + bool ret = false; + int i, size; + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + goto out; + + /* The new tt_req will be issued only if I'm not waiting for a + * reply from the same orig_node yet + */ + tt_req_node = batadv_tt_req_node_new(bat_priv, dst_orig_node); + if (!tt_req_node) + goto out; + + size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan; + tvlv_tt_data = kzalloc(size, GFP_ATOMIC); + if (!tvlv_tt_data) + goto out; + + tvlv_tt_data->flags = BATADV_TT_REQUEST; + tvlv_tt_data->ttvn = ttvn; + tvlv_tt_data->num_vlan = htons(num_vlan); + + /* send all the CRCs within the request. This is needed by intermediate + * nodes to ensure they have the correct table before replying + */ + tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1); + for (i = 0; i < num_vlan; i++) { + tt_vlan_req->vid = tt_vlan->vid; + tt_vlan_req->crc = tt_vlan->crc; + + tt_vlan_req++; + tt_vlan++; + } + + if (full_table) + tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE; + + batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n", + dst_orig_node->orig, full_table ? 'F' : '.'); + + batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX); + batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr, + dst_orig_node->orig, BATADV_TVLV_TT, 1, + tvlv_tt_data, size); + ret = true; + +out: + batadv_hardif_put(primary_if); + + if (ret && tt_req_node) { + spin_lock_bh(&bat_priv->tt.req_list_lock); + if (!hlist_unhashed(&tt_req_node->list)) { + hlist_del_init(&tt_req_node->list); + batadv_tt_req_node_put(tt_req_node); + } + spin_unlock_bh(&bat_priv->tt.req_list_lock); + } + + batadv_tt_req_node_put(tt_req_node); + + kfree(tvlv_tt_data); + return ret; +} + +/** + * batadv_send_other_tt_response() - send reply to tt request concerning another + * node's translation table + * @bat_priv: the bat priv with all the soft interface information + * @tt_data: tt data containing the tt request information + * @req_src: mac address of tt request sender + * @req_dst: mac address of tt request recipient + * + * Return: true if tt request reply was sent, false otherwise. + */ +static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv, + struct batadv_tvlv_tt_data *tt_data, + u8 *req_src, u8 *req_dst) +{ + struct batadv_orig_node *req_dst_orig_node; + struct batadv_orig_node *res_dst_orig_node = NULL; + struct batadv_tvlv_tt_change *tt_change; + struct batadv_tvlv_tt_data *tvlv_tt_data = NULL; + struct batadv_tvlv_tt_vlan_data *tt_vlan; + bool ret = false, full_table; + u8 orig_ttvn, req_ttvn; + u16 tvlv_len; + s32 tt_len; + + batadv_dbg(BATADV_DBG_TT, bat_priv, + "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n", + req_src, tt_data->ttvn, req_dst, + ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.')); + + /* Let's get the orig node of the REAL destination */ + req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst); + if (!req_dst_orig_node) + goto out; + + res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src); + if (!res_dst_orig_node) + goto out; + + orig_ttvn = (u8)atomic_read(&req_dst_orig_node->last_ttvn); + req_ttvn = tt_data->ttvn; + + tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1); + /* this node doesn't have the requested data */ + if (orig_ttvn != req_ttvn || + !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan, + ntohs(tt_data->num_vlan))) + goto out; + + /* If the full table has been explicitly requested */ + if (tt_data->flags & BATADV_TT_FULL_TABLE || + !req_dst_orig_node->tt_buff) + full_table = true; + else + full_table = false; + + /* TT fragmentation hasn't been implemented yet, so send as many + * TT entries fit a single packet as possible only + */ + if (!full_table) { + spin_lock_bh(&req_dst_orig_node->tt_buff_lock); + tt_len = req_dst_orig_node->tt_buff_len; + + tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node, + &tvlv_tt_data, + &tt_change, + &tt_len); + if (!tt_len) + goto unlock; + + /* Copy the last orig_node's OGM buffer */ + memcpy(tt_change, req_dst_orig_node->tt_buff, + req_dst_orig_node->tt_buff_len); + spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); + } else { + /* allocate the tvlv, put the tt_data and all the tt_vlan_data + * in the initial part + */ + tt_len = -1; + tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node, + &tvlv_tt_data, + &tt_change, + &tt_len); + if (!tt_len) + goto out; + + /* fill the rest of the tvlv with the real TT entries */ + batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash, + tt_change, tt_len, + batadv_tt_global_valid, + req_dst_orig_node); + } + + /* Don't send the response, if larger than fragmented packet. */ + tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len; + if (tt_len > atomic_read(&bat_priv->packet_size_max)) { + net_ratelimited_function(batadv_info, bat_priv->soft_iface, + "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n", + res_dst_orig_node->orig); + goto out; + } + + tvlv_tt_data->flags = BATADV_TT_RESPONSE; + tvlv_tt_data->ttvn = req_ttvn; + + if (full_table) + tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE; + + batadv_dbg(BATADV_DBG_TT, bat_priv, + "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n", + res_dst_orig_node->orig, req_dst_orig_node->orig, + full_table ? 'F' : '.', req_ttvn); + + batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX); + + batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig, + req_src, BATADV_TVLV_TT, 1, tvlv_tt_data, + tvlv_len); + + ret = true; + goto out; + +unlock: + spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); + +out: + batadv_orig_node_put(res_dst_orig_node); + batadv_orig_node_put(req_dst_orig_node); + kfree(tvlv_tt_data); + return ret; +} + +/** + * batadv_send_my_tt_response() - send reply to tt request concerning this + * node's translation table + * @bat_priv: the bat priv with all the soft interface information + * @tt_data: tt data containing the tt request information + * @req_src: mac address of tt request sender + * + * Return: true if tt request reply was sent, false otherwise. + */ +static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv, + struct batadv_tvlv_tt_data *tt_data, + u8 *req_src) +{ + struct batadv_tvlv_tt_data *tvlv_tt_data = NULL; + struct batadv_hard_iface *primary_if = NULL; + struct batadv_tvlv_tt_change *tt_change; + struct batadv_orig_node *orig_node; + u8 my_ttvn, req_ttvn; + u16 tvlv_len; + bool full_table; + s32 tt_len; + + batadv_dbg(BATADV_DBG_TT, bat_priv, + "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n", + req_src, tt_data->ttvn, + ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.')); + + spin_lock_bh(&bat_priv->tt.commit_lock); + + my_ttvn = (u8)atomic_read(&bat_priv->tt.vn); + req_ttvn = tt_data->ttvn; + + orig_node = batadv_orig_hash_find(bat_priv, req_src); + if (!orig_node) + goto out; + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + goto out; + + /* If the full table has been explicitly requested or the gap + * is too big send the whole local translation table + */ + if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn || + !bat_priv->tt.last_changeset) + full_table = true; + else + full_table = false; + + /* TT fragmentation hasn't been implemented yet, so send as many + * TT entries fit a single packet as possible only + */ + if (!full_table) { + spin_lock_bh(&bat_priv->tt.last_changeset_lock); + + tt_len = bat_priv->tt.last_changeset_len; + tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, + &tvlv_tt_data, + &tt_change, + &tt_len); + if (!tt_len || !tvlv_len) + goto unlock; + + /* Copy the last orig_node's OGM buffer */ + memcpy(tt_change, bat_priv->tt.last_changeset, + bat_priv->tt.last_changeset_len); + spin_unlock_bh(&bat_priv->tt.last_changeset_lock); + } else { + req_ttvn = (u8)atomic_read(&bat_priv->tt.vn); + + /* allocate the tvlv, put the tt_data and all the tt_vlan_data + * in the initial part + */ + tt_len = -1; + tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, + &tvlv_tt_data, + &tt_change, + &tt_len); + if (!tt_len || !tvlv_len) + goto out; + + /* fill the rest of the tvlv with the real TT entries */ + batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash, + tt_change, tt_len, + batadv_tt_local_valid, NULL); + } + + tvlv_tt_data->flags = BATADV_TT_RESPONSE; + tvlv_tt_data->ttvn = req_ttvn; + + if (full_table) + tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE; + + batadv_dbg(BATADV_DBG_TT, bat_priv, + "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n", + orig_node->orig, full_table ? 'F' : '.', req_ttvn); + + batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX); + + batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr, + req_src, BATADV_TVLV_TT, 1, tvlv_tt_data, + tvlv_len); + + goto out; + +unlock: + spin_unlock_bh(&bat_priv->tt.last_changeset_lock); +out: + spin_unlock_bh(&bat_priv->tt.commit_lock); + batadv_orig_node_put(orig_node); + batadv_hardif_put(primary_if); + kfree(tvlv_tt_data); + /* The packet was for this host, so it doesn't need to be re-routed */ + return true; +} + +/** + * batadv_send_tt_response() - send reply to tt request + * @bat_priv: the bat priv with all the soft interface information + * @tt_data: tt data containing the tt request information + * @req_src: mac address of tt request sender + * @req_dst: mac address of tt request recipient + * + * Return: true if tt request reply was sent, false otherwise. + */ +static bool batadv_send_tt_response(struct batadv_priv *bat_priv, + struct batadv_tvlv_tt_data *tt_data, + u8 *req_src, u8 *req_dst) +{ + if (batadv_is_my_mac(bat_priv, req_dst)) + return batadv_send_my_tt_response(bat_priv, tt_data, req_src); + return batadv_send_other_tt_response(bat_priv, tt_data, req_src, + req_dst); +} + +static void _batadv_tt_update_changes(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + struct batadv_tvlv_tt_change *tt_change, + u16 tt_num_changes, u8 ttvn) +{ + int i; + int roams; + + for (i = 0; i < tt_num_changes; i++) { + if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) { + roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM; + batadv_tt_global_del(bat_priv, orig_node, + (tt_change + i)->addr, + ntohs((tt_change + i)->vid), + "tt removed by changes", + roams); + } else { + if (!batadv_tt_global_add(bat_priv, orig_node, + (tt_change + i)->addr, + ntohs((tt_change + i)->vid), + (tt_change + i)->flags, ttvn)) + /* In case of problem while storing a + * global_entry, we stop the updating + * procedure without committing the + * ttvn change. This will avoid to send + * corrupted data on tt_request + */ + return; + } + } + set_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized); +} + +static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv, + struct batadv_tvlv_tt_change *tt_change, + u8 ttvn, u8 *resp_src, + u16 num_entries) +{ + struct batadv_orig_node *orig_node; + + orig_node = batadv_orig_hash_find(bat_priv, resp_src); + if (!orig_node) + goto out; + + /* Purge the old table first.. */ + batadv_tt_global_del_orig(bat_priv, orig_node, -1, + "Received full table"); + + _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries, + ttvn); + + spin_lock_bh(&orig_node->tt_buff_lock); + kfree(orig_node->tt_buff); + orig_node->tt_buff_len = 0; + orig_node->tt_buff = NULL; + spin_unlock_bh(&orig_node->tt_buff_lock); + + atomic_set(&orig_node->last_ttvn, ttvn); + +out: + batadv_orig_node_put(orig_node); +} + +static void batadv_tt_update_changes(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + u16 tt_num_changes, u8 ttvn, + struct batadv_tvlv_tt_change *tt_change) +{ + _batadv_tt_update_changes(bat_priv, orig_node, tt_change, + tt_num_changes, ttvn); + + batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change, + batadv_tt_len(tt_num_changes)); + atomic_set(&orig_node->last_ttvn, ttvn); +} + +/** + * batadv_is_my_client() - check if a client is served by the local node + * @bat_priv: the bat priv with all the soft interface information + * @addr: the mac address of the client to check + * @vid: VLAN identifier + * + * Return: true if the client is served by this node, false otherwise. + */ +bool batadv_is_my_client(struct batadv_priv *bat_priv, const u8 *addr, + unsigned short vid) +{ + struct batadv_tt_local_entry *tt_local_entry; + bool ret = false; + + tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid); + if (!tt_local_entry) + goto out; + /* Check if the client has been logically deleted (but is kept for + * consistency purpose) + */ + if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) || + (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM)) + goto out; + ret = true; +out: + batadv_tt_local_entry_put(tt_local_entry); + return ret; +} + +/** + * batadv_handle_tt_response() - process incoming tt reply + * @bat_priv: the bat priv with all the soft interface information + * @tt_data: tt data containing the tt request information + * @resp_src: mac address of tt reply sender + * @num_entries: number of tt change entries appended to the tt data + */ +static void batadv_handle_tt_response(struct batadv_priv *bat_priv, + struct batadv_tvlv_tt_data *tt_data, + u8 *resp_src, u16 num_entries) +{ + struct batadv_tt_req_node *node; + struct hlist_node *safe; + struct batadv_orig_node *orig_node = NULL; + struct batadv_tvlv_tt_change *tt_change; + u8 *tvlv_ptr = (u8 *)tt_data; + u16 change_offset; + + batadv_dbg(BATADV_DBG_TT, bat_priv, + "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n", + resp_src, tt_data->ttvn, num_entries, + ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.')); + + orig_node = batadv_orig_hash_find(bat_priv, resp_src); + if (!orig_node) + goto out; + + spin_lock_bh(&orig_node->tt_lock); + + change_offset = sizeof(struct batadv_tvlv_tt_vlan_data); + change_offset *= ntohs(tt_data->num_vlan); + change_offset += sizeof(*tt_data); + tvlv_ptr += change_offset; + + tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr; + if (tt_data->flags & BATADV_TT_FULL_TABLE) { + batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn, + resp_src, num_entries); + } else { + batadv_tt_update_changes(bat_priv, orig_node, num_entries, + tt_data->ttvn, tt_change); + } + + /* Recalculate the CRC for this orig_node and store it */ + batadv_tt_global_update_crc(bat_priv, orig_node); + + spin_unlock_bh(&orig_node->tt_lock); + + /* Delete the tt_req_node from pending tt_requests list */ + spin_lock_bh(&bat_priv->tt.req_list_lock); + hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { + if (!batadv_compare_eth(node->addr, resp_src)) + continue; + hlist_del_init(&node->list); + batadv_tt_req_node_put(node); + } + + spin_unlock_bh(&bat_priv->tt.req_list_lock); +out: + batadv_orig_node_put(orig_node); +} + +static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv) +{ + struct batadv_tt_roam_node *node, *safe; + + spin_lock_bh(&bat_priv->tt.roam_list_lock); + + list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) { + list_del(&node->list); + kmem_cache_free(batadv_tt_roam_cache, node); + } + + spin_unlock_bh(&bat_priv->tt.roam_list_lock); +} + +static void batadv_tt_roam_purge(struct batadv_priv *bat_priv) +{ + struct batadv_tt_roam_node *node, *safe; + + spin_lock_bh(&bat_priv->tt.roam_list_lock); + list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) { + if (!batadv_has_timed_out(node->first_time, + BATADV_ROAMING_MAX_TIME)) + continue; + + list_del(&node->list); + kmem_cache_free(batadv_tt_roam_cache, node); + } + spin_unlock_bh(&bat_priv->tt.roam_list_lock); +} + +/** + * batadv_tt_check_roam_count() - check if a client has roamed too frequently + * @bat_priv: the bat priv with all the soft interface information + * @client: mac address of the roaming client + * + * This function checks whether the client already reached the + * maximum number of possible roaming phases. In this case the ROAMING_ADV + * will not be sent. + * + * Return: true if the ROAMING_ADV can be sent, false otherwise + */ +static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, u8 *client) +{ + struct batadv_tt_roam_node *tt_roam_node; + bool ret = false; + + spin_lock_bh(&bat_priv->tt.roam_list_lock); + /* The new tt_req will be issued only if I'm not waiting for a + * reply from the same orig_node yet + */ + list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) { + if (!batadv_compare_eth(tt_roam_node->addr, client)) + continue; + + if (batadv_has_timed_out(tt_roam_node->first_time, + BATADV_ROAMING_MAX_TIME)) + continue; + + if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter)) + /* Sorry, you roamed too many times! */ + goto unlock; + ret = true; + break; + } + + if (!ret) { + tt_roam_node = kmem_cache_alloc(batadv_tt_roam_cache, + GFP_ATOMIC); + if (!tt_roam_node) + goto unlock; + + tt_roam_node->first_time = jiffies; + atomic_set(&tt_roam_node->counter, + BATADV_ROAMING_MAX_COUNT - 1); + ether_addr_copy(tt_roam_node->addr, client); + + list_add(&tt_roam_node->list, &bat_priv->tt.roam_list); + ret = true; + } + +unlock: + spin_unlock_bh(&bat_priv->tt.roam_list_lock); + return ret; +} + +/** + * batadv_send_roam_adv() - send a roaming advertisement message + * @bat_priv: the bat priv with all the soft interface information + * @client: mac address of the roaming client + * @vid: VLAN identifier + * @orig_node: message destination + * + * Send a ROAMING_ADV message to the node which was previously serving this + * client. This is done to inform the node that from now on all traffic destined + * for this particular roamed client has to be forwarded to the sender of the + * roaming message. + */ +static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client, + unsigned short vid, + struct batadv_orig_node *orig_node) +{ + struct batadv_hard_iface *primary_if; + struct batadv_tvlv_roam_adv tvlv_roam; + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + goto out; + + /* before going on we have to check whether the client has + * already roamed to us too many times + */ + if (!batadv_tt_check_roam_count(bat_priv, client)) + goto out; + + batadv_dbg(BATADV_DBG_TT, bat_priv, + "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n", + orig_node->orig, client, batadv_print_vid(vid)); + + batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX); + + memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client)); + tvlv_roam.vid = htons(vid); + + batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr, + orig_node->orig, BATADV_TVLV_ROAM, 1, + &tvlv_roam, sizeof(tvlv_roam)); + +out: + batadv_hardif_put(primary_if); +} + +static void batadv_tt_purge(struct work_struct *work) +{ + struct delayed_work *delayed_work; + struct batadv_priv_tt *priv_tt; + struct batadv_priv *bat_priv; + + delayed_work = to_delayed_work(work); + priv_tt = container_of(delayed_work, struct batadv_priv_tt, work); + bat_priv = container_of(priv_tt, struct batadv_priv, tt); + + batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT); + batadv_tt_global_purge(bat_priv); + batadv_tt_req_purge(bat_priv); + batadv_tt_roam_purge(bat_priv); + + queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work, + msecs_to_jiffies(BATADV_TT_WORK_PERIOD)); +} + +/** + * batadv_tt_free() - Free translation table of soft interface + * @bat_priv: the bat priv with all the soft interface information + */ +void batadv_tt_free(struct batadv_priv *bat_priv) +{ + batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_ROAM, 1); + + batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1); + batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1); + + cancel_delayed_work_sync(&bat_priv->tt.work); + + batadv_tt_local_table_free(bat_priv); + batadv_tt_global_table_free(bat_priv); + batadv_tt_req_list_free(bat_priv); + batadv_tt_changes_list_free(bat_priv); + batadv_tt_roam_list_free(bat_priv); + + kfree(bat_priv->tt.last_changeset); +} + +/** + * batadv_tt_local_set_flags() - set or unset the specified flags on the local + * table and possibly count them in the TT size + * @bat_priv: the bat priv with all the soft interface information + * @flags: the flag to switch + * @enable: whether to set or unset the flag + * @count: whether to increase the TT size by the number of changed entries + */ +static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv, u16 flags, + bool enable, bool count) +{ + struct batadv_hashtable *hash = bat_priv->tt.local_hash; + struct batadv_tt_common_entry *tt_common_entry; + struct hlist_head *head; + u32 i; + + if (!hash) + return; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + rcu_read_lock(); + hlist_for_each_entry_rcu(tt_common_entry, + head, hash_entry) { + if (enable) { + if ((tt_common_entry->flags & flags) == flags) + continue; + tt_common_entry->flags |= flags; + } else { + if (!(tt_common_entry->flags & flags)) + continue; + tt_common_entry->flags &= ~flags; + } + + if (!count) + continue; + + batadv_tt_local_size_inc(bat_priv, + tt_common_entry->vid); + } + rcu_read_unlock(); + } +} + +/* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */ +static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv) +{ + struct batadv_hashtable *hash = bat_priv->tt.local_hash; + struct batadv_tt_common_entry *tt_common; + struct batadv_tt_local_entry *tt_local; + struct hlist_node *node_tmp; + struct hlist_head *head; + spinlock_t *list_lock; /* protects write access to the hash lists */ + u32 i; + + if (!hash) + return; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + list_lock = &hash->list_locks[i]; + + spin_lock_bh(list_lock); + hlist_for_each_entry_safe(tt_common, node_tmp, head, + hash_entry) { + if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING)) + continue; + + batadv_dbg(BATADV_DBG_TT, bat_priv, + "Deleting local tt entry (%pM, vid: %d): pending\n", + tt_common->addr, + batadv_print_vid(tt_common->vid)); + + batadv_tt_local_size_dec(bat_priv, tt_common->vid); + hlist_del_rcu(&tt_common->hash_entry); + tt_local = container_of(tt_common, + struct batadv_tt_local_entry, + common); + + batadv_tt_local_entry_put(tt_local); + } + spin_unlock_bh(list_lock); + } +} + +/** + * batadv_tt_local_commit_changes_nolock() - commit all pending local tt changes + * which have been queued in the time since the last commit + * @bat_priv: the bat priv with all the soft interface information + * + * Caller must hold tt->commit_lock. + */ +static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv) +{ + lockdep_assert_held(&bat_priv->tt.commit_lock); + + if (atomic_read(&bat_priv->tt.local_changes) < 1) { + if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt)) + batadv_tt_tvlv_container_update(bat_priv); + return; + } + + batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true); + + batadv_tt_local_purge_pending_clients(bat_priv); + batadv_tt_local_update_crc(bat_priv); + + /* Increment the TTVN only once per OGM interval */ + atomic_inc(&bat_priv->tt.vn); + batadv_dbg(BATADV_DBG_TT, bat_priv, + "Local changes committed, updating to ttvn %u\n", + (u8)atomic_read(&bat_priv->tt.vn)); + + /* reset the sending counter */ + atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX); + batadv_tt_tvlv_container_update(bat_priv); +} + +/** + * batadv_tt_local_commit_changes() - commit all pending local tt changes which + * have been queued in the time since the last commit + * @bat_priv: the bat priv with all the soft interface information + */ +void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv) +{ + spin_lock_bh(&bat_priv->tt.commit_lock); + batadv_tt_local_commit_changes_nolock(bat_priv); + spin_unlock_bh(&bat_priv->tt.commit_lock); +} + +/** + * batadv_is_ap_isolated() - Check if packet from upper layer should be dropped + * @bat_priv: the bat priv with all the soft interface information + * @src: source mac address of packet + * @dst: destination mac address of packet + * @vid: vlan id of packet + * + * Return: true when src+dst(+vid) pair should be isolated, false otherwise + */ +bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, u8 *src, u8 *dst, + unsigned short vid) +{ + struct batadv_tt_local_entry *tt_local_entry; + struct batadv_tt_global_entry *tt_global_entry; + struct batadv_softif_vlan *vlan; + bool ret = false; + + vlan = batadv_softif_vlan_get(bat_priv, vid); + if (!vlan) + return false; + + if (!atomic_read(&vlan->ap_isolation)) + goto vlan_put; + + tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid); + if (!tt_local_entry) + goto vlan_put; + + tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid); + if (!tt_global_entry) + goto local_entry_put; + + if (_batadv_is_ap_isolated(tt_local_entry, tt_global_entry)) + ret = true; + + batadv_tt_global_entry_put(tt_global_entry); +local_entry_put: + batadv_tt_local_entry_put(tt_local_entry); +vlan_put: + batadv_softif_vlan_put(vlan); + return ret; +} + +/** + * batadv_tt_update_orig() - update global translation table with new tt + * information received via ogms + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: the orig_node of the ogm + * @tt_buff: pointer to the first tvlv VLAN entry + * @tt_num_vlan: number of tvlv VLAN entries + * @tt_change: pointer to the first entry in the TT buffer + * @tt_num_changes: number of tt changes inside the tt buffer + * @ttvn: translation table version number of this changeset + */ +static void batadv_tt_update_orig(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + const void *tt_buff, u16 tt_num_vlan, + struct batadv_tvlv_tt_change *tt_change, + u16 tt_num_changes, u8 ttvn) +{ + u8 orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn); + struct batadv_tvlv_tt_vlan_data *tt_vlan; + bool full_table = true; + bool has_tt_init; + + tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff; + has_tt_init = test_bit(BATADV_ORIG_CAPA_HAS_TT, + &orig_node->capa_initialized); + + /* orig table not initialised AND first diff is in the OGM OR the ttvn + * increased by one -> we can apply the attached changes + */ + if ((!has_tt_init && ttvn == 1) || ttvn - orig_ttvn == 1) { + /* the OGM could not contain the changes due to their size or + * because they have already been sent BATADV_TT_OGM_APPEND_MAX + * times. + * In this case send a tt request + */ + if (!tt_num_changes) { + full_table = false; + goto request_table; + } + + spin_lock_bh(&orig_node->tt_lock); + + batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes, + ttvn, tt_change); + + /* Even if we received the precomputed crc with the OGM, we + * prefer to recompute it to spot any possible inconsistency + * in the global table + */ + batadv_tt_global_update_crc(bat_priv, orig_node); + + spin_unlock_bh(&orig_node->tt_lock); + + /* The ttvn alone is not enough to guarantee consistency + * because a single value could represent different states + * (due to the wrap around). Thus a node has to check whether + * the resulting table (after applying the changes) is still + * consistent or not. E.g. a node could disconnect while its + * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case + * checking the CRC value is mandatory to detect the + * inconsistency + */ + if (!batadv_tt_global_check_crc(orig_node, tt_vlan, + tt_num_vlan)) + goto request_table; + } else { + /* if we missed more than one change or our tables are not + * in sync anymore -> request fresh tt data + */ + if (!has_tt_init || ttvn != orig_ttvn || + !batadv_tt_global_check_crc(orig_node, tt_vlan, + tt_num_vlan)) { +request_table: + batadv_dbg(BATADV_DBG_TT, bat_priv, + "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n", + orig_node->orig, ttvn, orig_ttvn, + tt_num_changes); + batadv_send_tt_request(bat_priv, orig_node, ttvn, + tt_vlan, tt_num_vlan, + full_table); + return; + } + } +} + +/** + * batadv_tt_global_client_is_roaming() - check if a client is marked as roaming + * @bat_priv: the bat priv with all the soft interface information + * @addr: the mac address of the client to check + * @vid: VLAN identifier + * + * Return: true if we know that the client has moved from its old originator + * to another one. This entry is still kept for consistency purposes and will be + * deleted later by a DEL or because of timeout + */ +bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv, + u8 *addr, unsigned short vid) +{ + struct batadv_tt_global_entry *tt_global_entry; + bool ret = false; + + tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid); + if (!tt_global_entry) + goto out; + + ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM; + batadv_tt_global_entry_put(tt_global_entry); +out: + return ret; +} + +/** + * batadv_tt_local_client_is_roaming() - tells whether the client is roaming + * @bat_priv: the bat priv with all the soft interface information + * @addr: the mac address of the local client to query + * @vid: VLAN identifier + * + * Return: true if the local client is known to be roaming (it is not served by + * this node anymore) or not. If yes, the client is still present in the table + * to keep the latter consistent with the node TTVN + */ +bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv, + u8 *addr, unsigned short vid) +{ + struct batadv_tt_local_entry *tt_local_entry; + bool ret = false; + + tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid); + if (!tt_local_entry) + goto out; + + ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM; + batadv_tt_local_entry_put(tt_local_entry); +out: + return ret; +} + +/** + * batadv_tt_add_temporary_global_entry() - Add temporary entry to global TT + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: orig node which the temporary entry should be associated with + * @addr: mac address of the client + * @vid: VLAN id of the new temporary global translation table + * + * Return: true when temporary tt entry could be added, false otherwise + */ +bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + const unsigned char *addr, + unsigned short vid) +{ + /* ignore loop detect macs, they are not supposed to be in the tt local + * data as well. + */ + if (batadv_bla_is_loopdetect_mac(addr)) + return false; + + if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid, + BATADV_TT_CLIENT_TEMP, + atomic_read(&orig_node->last_ttvn))) + return false; + + batadv_dbg(BATADV_DBG_TT, bat_priv, + "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n", + addr, batadv_print_vid(vid), orig_node->orig); + + return true; +} + +/** + * batadv_tt_local_resize_to_mtu() - resize the local translation table fit the + * maximum packet size that can be transported through the mesh + * @soft_iface: netdev struct of the mesh interface + * + * Remove entries older than 'timeout' and half timeout if more entries need + * to be removed. + */ +void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface) +{ + struct batadv_priv *bat_priv = netdev_priv(soft_iface); + int packet_size_max = atomic_read(&bat_priv->packet_size_max); + int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2; + bool reduced = false; + + spin_lock_bh(&bat_priv->tt.commit_lock); + + while (true) { + table_size = batadv_tt_local_table_transmit_size(bat_priv); + if (packet_size_max >= table_size) + break; + + batadv_tt_local_purge(bat_priv, timeout); + batadv_tt_local_purge_pending_clients(bat_priv); + + timeout /= 2; + reduced = true; + net_ratelimited_function(batadv_info, soft_iface, + "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n", + packet_size_max); + } + + /* commit these changes immediately, to avoid synchronization problem + * with the TTVN + */ + if (reduced) + batadv_tt_local_commit_changes_nolock(bat_priv); + + spin_unlock_bh(&bat_priv->tt.commit_lock); +} + +/** + * batadv_tt_tvlv_ogm_handler_v1() - process incoming tt tvlv container + * @bat_priv: the bat priv with all the soft interface information + * @orig: the orig_node of the ogm + * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) + * @tvlv_value: tvlv buffer containing the gateway data + * @tvlv_value_len: tvlv buffer length + */ +static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig, + u8 flags, void *tvlv_value, + u16 tvlv_value_len) +{ + struct batadv_tvlv_tt_vlan_data *tt_vlan; + struct batadv_tvlv_tt_change *tt_change; + struct batadv_tvlv_tt_data *tt_data; + u16 num_entries, num_vlan; + + if (tvlv_value_len < sizeof(*tt_data)) + return; + + tt_data = tvlv_value; + tvlv_value_len -= sizeof(*tt_data); + + num_vlan = ntohs(tt_data->num_vlan); + + if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan) + return; + + tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1); + tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan); + tvlv_value_len -= sizeof(*tt_vlan) * num_vlan; + + num_entries = batadv_tt_entries(tvlv_value_len); + + batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change, + num_entries, tt_data->ttvn); +} + +/** + * batadv_tt_tvlv_unicast_handler_v1() - process incoming (unicast) tt tvlv + * container + * @bat_priv: the bat priv with all the soft interface information + * @src: mac address of tt tvlv sender + * @dst: mac address of tt tvlv recipient + * @tvlv_value: tvlv buffer containing the tt data + * @tvlv_value_len: tvlv buffer length + * + * Return: NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS + * otherwise. + */ +static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv, + u8 *src, u8 *dst, + void *tvlv_value, + u16 tvlv_value_len) +{ + struct batadv_tvlv_tt_data *tt_data; + u16 tt_vlan_len, tt_num_entries; + char tt_flag; + bool ret; + + if (tvlv_value_len < sizeof(*tt_data)) + return NET_RX_SUCCESS; + + tt_data = tvlv_value; + tvlv_value_len -= sizeof(*tt_data); + + tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data); + tt_vlan_len *= ntohs(tt_data->num_vlan); + + if (tvlv_value_len < tt_vlan_len) + return NET_RX_SUCCESS; + + tvlv_value_len -= tt_vlan_len; + tt_num_entries = batadv_tt_entries(tvlv_value_len); + + switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) { + case BATADV_TT_REQUEST: + batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX); + + /* If this node cannot provide a TT response the tt_request is + * forwarded + */ + ret = batadv_send_tt_response(bat_priv, tt_data, src, dst); + if (!ret) { + if (tt_data->flags & BATADV_TT_FULL_TABLE) + tt_flag = 'F'; + else + tt_flag = '.'; + + batadv_dbg(BATADV_DBG_TT, bat_priv, + "Routing TT_REQUEST to %pM [%c]\n", + dst, tt_flag); + /* tvlv API will re-route the packet */ + return NET_RX_DROP; + } + break; + case BATADV_TT_RESPONSE: + batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX); + + if (batadv_is_my_mac(bat_priv, dst)) { + batadv_handle_tt_response(bat_priv, tt_data, + src, tt_num_entries); + return NET_RX_SUCCESS; + } + + if (tt_data->flags & BATADV_TT_FULL_TABLE) + tt_flag = 'F'; + else + tt_flag = '.'; + + batadv_dbg(BATADV_DBG_TT, bat_priv, + "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag); + + /* tvlv API will re-route the packet */ + return NET_RX_DROP; + } + + return NET_RX_SUCCESS; +} + +/** + * batadv_roam_tvlv_unicast_handler_v1() - process incoming tt roam tvlv + * container + * @bat_priv: the bat priv with all the soft interface information + * @src: mac address of tt tvlv sender + * @dst: mac address of tt tvlv recipient + * @tvlv_value: tvlv buffer containing the tt data + * @tvlv_value_len: tvlv buffer length + * + * Return: NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS + * otherwise. + */ +static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv, + u8 *src, u8 *dst, + void *tvlv_value, + u16 tvlv_value_len) +{ + struct batadv_tvlv_roam_adv *roaming_adv; + struct batadv_orig_node *orig_node = NULL; + + /* If this node is not the intended recipient of the + * roaming advertisement the packet is forwarded + * (the tvlv API will re-route the packet). + */ + if (!batadv_is_my_mac(bat_priv, dst)) + return NET_RX_DROP; + + if (tvlv_value_len < sizeof(*roaming_adv)) + goto out; + + orig_node = batadv_orig_hash_find(bat_priv, src); + if (!orig_node) + goto out; + + batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX); + roaming_adv = tvlv_value; + + batadv_dbg(BATADV_DBG_TT, bat_priv, + "Received ROAMING_ADV from %pM (client %pM)\n", + src, roaming_adv->client); + + batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client, + ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM, + atomic_read(&orig_node->last_ttvn) + 1); + +out: + batadv_orig_node_put(orig_node); + return NET_RX_SUCCESS; +} + +/** + * batadv_tt_init() - initialise the translation table internals + * @bat_priv: the bat priv with all the soft interface information + * + * Return: 0 on success or negative error number in case of failure. + */ +int batadv_tt_init(struct batadv_priv *bat_priv) +{ + int ret; + + /* synchronized flags must be remote */ + BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK)); + + ret = batadv_tt_local_init(bat_priv); + if (ret < 0) + return ret; + + ret = batadv_tt_global_init(bat_priv); + if (ret < 0) { + batadv_tt_local_table_free(bat_priv); + return ret; + } + + batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1, + batadv_tt_tvlv_unicast_handler_v1, + BATADV_TVLV_TT, 1, BATADV_NO_FLAGS); + + batadv_tvlv_handler_register(bat_priv, NULL, + batadv_roam_tvlv_unicast_handler_v1, + BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS); + + INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge); + queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work, + msecs_to_jiffies(BATADV_TT_WORK_PERIOD)); + + return 1; +} + +/** + * batadv_tt_global_is_isolated() - check if a client is marked as isolated + * @bat_priv: the bat priv with all the soft interface information + * @addr: the mac address of the client + * @vid: the identifier of the VLAN where this client is connected + * + * Return: true if the client is marked with the TT_CLIENT_ISOLA flag, false + * otherwise + */ +bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv, + const u8 *addr, unsigned short vid) +{ + struct batadv_tt_global_entry *tt; + bool ret; + + tt = batadv_tt_global_hash_find(bat_priv, addr, vid); + if (!tt) + return false; + + ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA; + + batadv_tt_global_entry_put(tt); + + return ret; +} + +/** + * batadv_tt_cache_init() - Initialize tt memory object cache + * + * Return: 0 on success or negative error number in case of failure. + */ +int __init batadv_tt_cache_init(void) +{ + size_t tl_size = sizeof(struct batadv_tt_local_entry); + size_t tg_size = sizeof(struct batadv_tt_global_entry); + size_t tt_orig_size = sizeof(struct batadv_tt_orig_list_entry); + size_t tt_change_size = sizeof(struct batadv_tt_change_node); + size_t tt_req_size = sizeof(struct batadv_tt_req_node); + size_t tt_roam_size = sizeof(struct batadv_tt_roam_node); + + batadv_tl_cache = kmem_cache_create("batadv_tl_cache", tl_size, 0, + SLAB_HWCACHE_ALIGN, NULL); + if (!batadv_tl_cache) + return -ENOMEM; + + batadv_tg_cache = kmem_cache_create("batadv_tg_cache", tg_size, 0, + SLAB_HWCACHE_ALIGN, NULL); + if (!batadv_tg_cache) + goto err_tt_tl_destroy; + + batadv_tt_orig_cache = kmem_cache_create("batadv_tt_orig_cache", + tt_orig_size, 0, + SLAB_HWCACHE_ALIGN, NULL); + if (!batadv_tt_orig_cache) + goto err_tt_tg_destroy; + + batadv_tt_change_cache = kmem_cache_create("batadv_tt_change_cache", + tt_change_size, 0, + SLAB_HWCACHE_ALIGN, NULL); + if (!batadv_tt_change_cache) + goto err_tt_orig_destroy; + + batadv_tt_req_cache = kmem_cache_create("batadv_tt_req_cache", + tt_req_size, 0, + SLAB_HWCACHE_ALIGN, NULL); + if (!batadv_tt_req_cache) + goto err_tt_change_destroy; + + batadv_tt_roam_cache = kmem_cache_create("batadv_tt_roam_cache", + tt_roam_size, 0, + SLAB_HWCACHE_ALIGN, NULL); + if (!batadv_tt_roam_cache) + goto err_tt_req_destroy; + + return 0; + +err_tt_req_destroy: + kmem_cache_destroy(batadv_tt_req_cache); + batadv_tt_req_cache = NULL; +err_tt_change_destroy: + kmem_cache_destroy(batadv_tt_change_cache); + batadv_tt_change_cache = NULL; +err_tt_orig_destroy: + kmem_cache_destroy(batadv_tt_orig_cache); + batadv_tt_orig_cache = NULL; +err_tt_tg_destroy: + kmem_cache_destroy(batadv_tg_cache); + batadv_tg_cache = NULL; +err_tt_tl_destroy: + kmem_cache_destroy(batadv_tl_cache); + batadv_tl_cache = NULL; + + return -ENOMEM; +} + +/** + * batadv_tt_cache_destroy() - Destroy tt memory object cache + */ +void batadv_tt_cache_destroy(void) +{ + kmem_cache_destroy(batadv_tl_cache); + kmem_cache_destroy(batadv_tg_cache); + kmem_cache_destroy(batadv_tt_orig_cache); + kmem_cache_destroy(batadv_tt_change_cache); + kmem_cache_destroy(batadv_tt_req_cache); + kmem_cache_destroy(batadv_tt_roam_cache); +} diff --git a/net/batman-adv/translation-table.h b/net/batman-adv/translation-table.h new file mode 100644 index 000000000..d18740d9a --- /dev/null +++ b/net/batman-adv/translation-table.h @@ -0,0 +1,74 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich, Antonio Quartulli + */ + +#ifndef _NET_BATMAN_ADV_TRANSLATION_TABLE_H_ +#define _NET_BATMAN_ADV_TRANSLATION_TABLE_H_ + +#include "main.h" + +#include <linux/kref.h> +#include <linux/netdevice.h> +#include <linux/netlink.h> +#include <linux/skbuff.h> +#include <linux/types.h> + +int batadv_tt_init(struct batadv_priv *bat_priv); +bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr, + unsigned short vid, int ifindex, u32 mark); +u16 batadv_tt_local_remove(struct batadv_priv *bat_priv, + const u8 *addr, unsigned short vid, + const char *message, bool roaming); +int batadv_tt_local_dump(struct sk_buff *msg, struct netlink_callback *cb); +int batadv_tt_global_dump(struct sk_buff *msg, struct netlink_callback *cb); +void batadv_tt_global_del_orig(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + s32 match_vid, const char *message); +struct batadv_tt_global_entry * +batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const u8 *addr, + unsigned short vid); +void batadv_tt_global_entry_release(struct kref *ref); +int batadv_tt_global_hash_count(struct batadv_priv *bat_priv, + const u8 *addr, unsigned short vid); +struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv, + const u8 *src, const u8 *addr, + unsigned short vid); +void batadv_tt_free(struct batadv_priv *bat_priv); +bool batadv_is_my_client(struct batadv_priv *bat_priv, const u8 *addr, + unsigned short vid); +bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, u8 *src, u8 *dst, + unsigned short vid); +void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv); +bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv, + u8 *addr, unsigned short vid); +bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv, + u8 *addr, unsigned short vid); +void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface); +bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + const unsigned char *addr, + unsigned short vid); +bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv, + const u8 *addr, unsigned short vid); + +int batadv_tt_cache_init(void); +void batadv_tt_cache_destroy(void); + +/** + * batadv_tt_global_entry_put() - decrement the tt_global_entry refcounter and + * possibly release it + * @tt_global_entry: tt_global_entry to be free'd + */ +static inline void +batadv_tt_global_entry_put(struct batadv_tt_global_entry *tt_global_entry) +{ + if (!tt_global_entry) + return; + + kref_put(&tt_global_entry->common.refcount, + batadv_tt_global_entry_release); +} + +#endif /* _NET_BATMAN_ADV_TRANSLATION_TABLE_H_ */ diff --git a/net/batman-adv/tvlv.c b/net/batman-adv/tvlv.c new file mode 100644 index 000000000..7ec2e2343 --- /dev/null +++ b/net/batman-adv/tvlv.c @@ -0,0 +1,636 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + */ + +#include "main.h" + +#include <linux/byteorder/generic.h> +#include <linux/container_of.h> +#include <linux/etherdevice.h> +#include <linux/gfp.h> +#include <linux/if_ether.h> +#include <linux/kref.h> +#include <linux/list.h> +#include <linux/lockdep.h> +#include <linux/netdevice.h> +#include <linux/pkt_sched.h> +#include <linux/rculist.h> +#include <linux/rcupdate.h> +#include <linux/skbuff.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/stddef.h> +#include <linux/string.h> +#include <linux/types.h> +#include <uapi/linux/batadv_packet.h> + +#include "originator.h" +#include "send.h" +#include "tvlv.h" + +/** + * batadv_tvlv_handler_release() - release tvlv handler from lists and queue for + * free after rcu grace period + * @ref: kref pointer of the tvlv + */ +static void batadv_tvlv_handler_release(struct kref *ref) +{ + struct batadv_tvlv_handler *tvlv_handler; + + tvlv_handler = container_of(ref, struct batadv_tvlv_handler, refcount); + kfree_rcu(tvlv_handler, rcu); +} + +/** + * batadv_tvlv_handler_put() - decrement the tvlv container refcounter and + * possibly release it + * @tvlv_handler: the tvlv handler to free + */ +static void batadv_tvlv_handler_put(struct batadv_tvlv_handler *tvlv_handler) +{ + if (!tvlv_handler) + return; + + kref_put(&tvlv_handler->refcount, batadv_tvlv_handler_release); +} + +/** + * batadv_tvlv_handler_get() - retrieve tvlv handler from the tvlv handler list + * based on the provided type and version (both need to match) + * @bat_priv: the bat priv with all the soft interface information + * @type: tvlv handler type to look for + * @version: tvlv handler version to look for + * + * Return: tvlv handler if found or NULL otherwise. + */ +static struct batadv_tvlv_handler * +batadv_tvlv_handler_get(struct batadv_priv *bat_priv, u8 type, u8 version) +{ + struct batadv_tvlv_handler *tvlv_handler_tmp, *tvlv_handler = NULL; + + rcu_read_lock(); + hlist_for_each_entry_rcu(tvlv_handler_tmp, + &bat_priv->tvlv.handler_list, list) { + if (tvlv_handler_tmp->type != type) + continue; + + if (tvlv_handler_tmp->version != version) + continue; + + if (!kref_get_unless_zero(&tvlv_handler_tmp->refcount)) + continue; + + tvlv_handler = tvlv_handler_tmp; + break; + } + rcu_read_unlock(); + + return tvlv_handler; +} + +/** + * batadv_tvlv_container_release() - release tvlv from lists and free + * @ref: kref pointer of the tvlv + */ +static void batadv_tvlv_container_release(struct kref *ref) +{ + struct batadv_tvlv_container *tvlv; + + tvlv = container_of(ref, struct batadv_tvlv_container, refcount); + kfree(tvlv); +} + +/** + * batadv_tvlv_container_put() - decrement the tvlv container refcounter and + * possibly release it + * @tvlv: the tvlv container to free + */ +static void batadv_tvlv_container_put(struct batadv_tvlv_container *tvlv) +{ + if (!tvlv) + return; + + kref_put(&tvlv->refcount, batadv_tvlv_container_release); +} + +/** + * batadv_tvlv_container_get() - retrieve tvlv container from the tvlv container + * list based on the provided type and version (both need to match) + * @bat_priv: the bat priv with all the soft interface information + * @type: tvlv container type to look for + * @version: tvlv container version to look for + * + * Has to be called with the appropriate locks being acquired + * (tvlv.container_list_lock). + * + * Return: tvlv container if found or NULL otherwise. + */ +static struct batadv_tvlv_container * +batadv_tvlv_container_get(struct batadv_priv *bat_priv, u8 type, u8 version) +{ + struct batadv_tvlv_container *tvlv_tmp, *tvlv = NULL; + + lockdep_assert_held(&bat_priv->tvlv.container_list_lock); + + hlist_for_each_entry(tvlv_tmp, &bat_priv->tvlv.container_list, list) { + if (tvlv_tmp->tvlv_hdr.type != type) + continue; + + if (tvlv_tmp->tvlv_hdr.version != version) + continue; + + kref_get(&tvlv_tmp->refcount); + tvlv = tvlv_tmp; + break; + } + + return tvlv; +} + +/** + * batadv_tvlv_container_list_size() - calculate the size of the tvlv container + * list entries + * @bat_priv: the bat priv with all the soft interface information + * + * Has to be called with the appropriate locks being acquired + * (tvlv.container_list_lock). + * + * Return: size of all currently registered tvlv containers in bytes. + */ +static u16 batadv_tvlv_container_list_size(struct batadv_priv *bat_priv) +{ + struct batadv_tvlv_container *tvlv; + u16 tvlv_len = 0; + + lockdep_assert_held(&bat_priv->tvlv.container_list_lock); + + hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) { + tvlv_len += sizeof(struct batadv_tvlv_hdr); + tvlv_len += ntohs(tvlv->tvlv_hdr.len); + } + + return tvlv_len; +} + +/** + * batadv_tvlv_container_remove() - remove tvlv container from the tvlv + * container list + * @bat_priv: the bat priv with all the soft interface information + * @tvlv: the to be removed tvlv container + * + * Has to be called with the appropriate locks being acquired + * (tvlv.container_list_lock). + */ +static void batadv_tvlv_container_remove(struct batadv_priv *bat_priv, + struct batadv_tvlv_container *tvlv) +{ + lockdep_assert_held(&bat_priv->tvlv.container_list_lock); + + if (!tvlv) + return; + + hlist_del(&tvlv->list); + + /* first call to decrement the counter, second call to free */ + batadv_tvlv_container_put(tvlv); + batadv_tvlv_container_put(tvlv); +} + +/** + * batadv_tvlv_container_unregister() - unregister tvlv container based on the + * provided type and version (both need to match) + * @bat_priv: the bat priv with all the soft interface information + * @type: tvlv container type to unregister + * @version: tvlv container type to unregister + */ +void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv, + u8 type, u8 version) +{ + struct batadv_tvlv_container *tvlv; + + spin_lock_bh(&bat_priv->tvlv.container_list_lock); + tvlv = batadv_tvlv_container_get(bat_priv, type, version); + batadv_tvlv_container_remove(bat_priv, tvlv); + spin_unlock_bh(&bat_priv->tvlv.container_list_lock); +} + +/** + * batadv_tvlv_container_register() - register tvlv type, version and content + * to be propagated with each (primary interface) OGM + * @bat_priv: the bat priv with all the soft interface information + * @type: tvlv container type + * @version: tvlv container version + * @tvlv_value: tvlv container content + * @tvlv_value_len: tvlv container content length + * + * If a container of the same type and version was already registered the new + * content is going to replace the old one. + */ +void batadv_tvlv_container_register(struct batadv_priv *bat_priv, + u8 type, u8 version, + void *tvlv_value, u16 tvlv_value_len) +{ + struct batadv_tvlv_container *tvlv_old, *tvlv_new; + + if (!tvlv_value) + tvlv_value_len = 0; + + tvlv_new = kzalloc(sizeof(*tvlv_new) + tvlv_value_len, GFP_ATOMIC); + if (!tvlv_new) + return; + + tvlv_new->tvlv_hdr.version = version; + tvlv_new->tvlv_hdr.type = type; + tvlv_new->tvlv_hdr.len = htons(tvlv_value_len); + + memcpy(tvlv_new + 1, tvlv_value, ntohs(tvlv_new->tvlv_hdr.len)); + INIT_HLIST_NODE(&tvlv_new->list); + kref_init(&tvlv_new->refcount); + + spin_lock_bh(&bat_priv->tvlv.container_list_lock); + tvlv_old = batadv_tvlv_container_get(bat_priv, type, version); + batadv_tvlv_container_remove(bat_priv, tvlv_old); + + kref_get(&tvlv_new->refcount); + hlist_add_head(&tvlv_new->list, &bat_priv->tvlv.container_list); + spin_unlock_bh(&bat_priv->tvlv.container_list_lock); + + /* don't return reference to new tvlv_container */ + batadv_tvlv_container_put(tvlv_new); +} + +/** + * batadv_tvlv_realloc_packet_buff() - reallocate packet buffer to accommodate + * requested packet size + * @packet_buff: packet buffer + * @packet_buff_len: packet buffer size + * @min_packet_len: requested packet minimum size + * @additional_packet_len: requested additional packet size on top of minimum + * size + * + * Return: true of the packet buffer could be changed to the requested size, + * false otherwise. + */ +static bool batadv_tvlv_realloc_packet_buff(unsigned char **packet_buff, + int *packet_buff_len, + int min_packet_len, + int additional_packet_len) +{ + unsigned char *new_buff; + + new_buff = kmalloc(min_packet_len + additional_packet_len, GFP_ATOMIC); + + /* keep old buffer if kmalloc should fail */ + if (!new_buff) + return false; + + memcpy(new_buff, *packet_buff, min_packet_len); + kfree(*packet_buff); + *packet_buff = new_buff; + *packet_buff_len = min_packet_len + additional_packet_len; + + return true; +} + +/** + * batadv_tvlv_container_ogm_append() - append tvlv container content to given + * OGM packet buffer + * @bat_priv: the bat priv with all the soft interface information + * @packet_buff: ogm packet buffer + * @packet_buff_len: ogm packet buffer size including ogm header and tvlv + * content + * @packet_min_len: ogm header size to be preserved for the OGM itself + * + * The ogm packet might be enlarged or shrunk depending on the current size + * and the size of the to-be-appended tvlv containers. + * + * Return: size of all appended tvlv containers in bytes. + */ +u16 batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv, + unsigned char **packet_buff, + int *packet_buff_len, int packet_min_len) +{ + struct batadv_tvlv_container *tvlv; + struct batadv_tvlv_hdr *tvlv_hdr; + u16 tvlv_value_len; + void *tvlv_value; + bool ret; + + spin_lock_bh(&bat_priv->tvlv.container_list_lock); + tvlv_value_len = batadv_tvlv_container_list_size(bat_priv); + + ret = batadv_tvlv_realloc_packet_buff(packet_buff, packet_buff_len, + packet_min_len, tvlv_value_len); + + if (!ret) + goto end; + + if (!tvlv_value_len) + goto end; + + tvlv_value = (*packet_buff) + packet_min_len; + + hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) { + tvlv_hdr = tvlv_value; + tvlv_hdr->type = tvlv->tvlv_hdr.type; + tvlv_hdr->version = tvlv->tvlv_hdr.version; + tvlv_hdr->len = tvlv->tvlv_hdr.len; + tvlv_value = tvlv_hdr + 1; + memcpy(tvlv_value, tvlv + 1, ntohs(tvlv->tvlv_hdr.len)); + tvlv_value = (u8 *)tvlv_value + ntohs(tvlv->tvlv_hdr.len); + } + +end: + spin_unlock_bh(&bat_priv->tvlv.container_list_lock); + return tvlv_value_len; +} + +/** + * batadv_tvlv_call_handler() - parse the given tvlv buffer to call the + * appropriate handlers + * @bat_priv: the bat priv with all the soft interface information + * @tvlv_handler: tvlv callback function handling the tvlv content + * @ogm_source: flag indicating whether the tvlv is an ogm or a unicast packet + * @orig_node: orig node emitting the ogm packet + * @src: source mac address of the unicast packet + * @dst: destination mac address of the unicast packet + * @tvlv_value: tvlv content + * @tvlv_value_len: tvlv content length + * + * Return: success if the handler was not found or the return value of the + * handler callback. + */ +static int batadv_tvlv_call_handler(struct batadv_priv *bat_priv, + struct batadv_tvlv_handler *tvlv_handler, + bool ogm_source, + struct batadv_orig_node *orig_node, + u8 *src, u8 *dst, + void *tvlv_value, u16 tvlv_value_len) +{ + if (!tvlv_handler) + return NET_RX_SUCCESS; + + if (ogm_source) { + if (!tvlv_handler->ogm_handler) + return NET_RX_SUCCESS; + + if (!orig_node) + return NET_RX_SUCCESS; + + tvlv_handler->ogm_handler(bat_priv, orig_node, + BATADV_NO_FLAGS, + tvlv_value, tvlv_value_len); + tvlv_handler->flags |= BATADV_TVLV_HANDLER_OGM_CALLED; + } else { + if (!src) + return NET_RX_SUCCESS; + + if (!dst) + return NET_RX_SUCCESS; + + if (!tvlv_handler->unicast_handler) + return NET_RX_SUCCESS; + + return tvlv_handler->unicast_handler(bat_priv, src, + dst, tvlv_value, + tvlv_value_len); + } + + return NET_RX_SUCCESS; +} + +/** + * batadv_tvlv_containers_process() - parse the given tvlv buffer to call the + * appropriate handlers + * @bat_priv: the bat priv with all the soft interface information + * @ogm_source: flag indicating whether the tvlv is an ogm or a unicast packet + * @orig_node: orig node emitting the ogm packet + * @src: source mac address of the unicast packet + * @dst: destination mac address of the unicast packet + * @tvlv_value: tvlv content + * @tvlv_value_len: tvlv content length + * + * Return: success when processing an OGM or the return value of all called + * handler callbacks. + */ +int batadv_tvlv_containers_process(struct batadv_priv *bat_priv, + bool ogm_source, + struct batadv_orig_node *orig_node, + u8 *src, u8 *dst, + void *tvlv_value, u16 tvlv_value_len) +{ + struct batadv_tvlv_handler *tvlv_handler; + struct batadv_tvlv_hdr *tvlv_hdr; + u16 tvlv_value_cont_len; + u8 cifnotfound = BATADV_TVLV_HANDLER_OGM_CIFNOTFND; + int ret = NET_RX_SUCCESS; + + while (tvlv_value_len >= sizeof(*tvlv_hdr)) { + tvlv_hdr = tvlv_value; + tvlv_value_cont_len = ntohs(tvlv_hdr->len); + tvlv_value = tvlv_hdr + 1; + tvlv_value_len -= sizeof(*tvlv_hdr); + + if (tvlv_value_cont_len > tvlv_value_len) + break; + + tvlv_handler = batadv_tvlv_handler_get(bat_priv, + tvlv_hdr->type, + tvlv_hdr->version); + + ret |= batadv_tvlv_call_handler(bat_priv, tvlv_handler, + ogm_source, orig_node, + src, dst, tvlv_value, + tvlv_value_cont_len); + batadv_tvlv_handler_put(tvlv_handler); + tvlv_value = (u8 *)tvlv_value + tvlv_value_cont_len; + tvlv_value_len -= tvlv_value_cont_len; + } + + if (!ogm_source) + return ret; + + rcu_read_lock(); + hlist_for_each_entry_rcu(tvlv_handler, + &bat_priv->tvlv.handler_list, list) { + if ((tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) && + !(tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CALLED)) + tvlv_handler->ogm_handler(bat_priv, orig_node, + cifnotfound, NULL, 0); + + tvlv_handler->flags &= ~BATADV_TVLV_HANDLER_OGM_CALLED; + } + rcu_read_unlock(); + + return NET_RX_SUCCESS; +} + +/** + * batadv_tvlv_ogm_receive() - process an incoming ogm and call the appropriate + * handlers + * @bat_priv: the bat priv with all the soft interface information + * @batadv_ogm_packet: ogm packet containing the tvlv containers + * @orig_node: orig node emitting the ogm packet + */ +void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv, + struct batadv_ogm_packet *batadv_ogm_packet, + struct batadv_orig_node *orig_node) +{ + void *tvlv_value; + u16 tvlv_value_len; + + if (!batadv_ogm_packet) + return; + + tvlv_value_len = ntohs(batadv_ogm_packet->tvlv_len); + if (!tvlv_value_len) + return; + + tvlv_value = batadv_ogm_packet + 1; + + batadv_tvlv_containers_process(bat_priv, true, orig_node, NULL, NULL, + tvlv_value, tvlv_value_len); +} + +/** + * batadv_tvlv_handler_register() - register tvlv handler based on the provided + * type and version (both need to match) for ogm tvlv payload and/or unicast + * payload + * @bat_priv: the bat priv with all the soft interface information + * @optr: ogm tvlv handler callback function. This function receives the orig + * node, flags and the tvlv content as argument to process. + * @uptr: unicast tvlv handler callback function. This function receives the + * source & destination of the unicast packet as well as the tvlv content + * to process. + * @type: tvlv handler type to be registered + * @version: tvlv handler version to be registered + * @flags: flags to enable or disable TVLV API behavior + */ +void batadv_tvlv_handler_register(struct batadv_priv *bat_priv, + void (*optr)(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig, + u8 flags, + void *tvlv_value, + u16 tvlv_value_len), + int (*uptr)(struct batadv_priv *bat_priv, + u8 *src, u8 *dst, + void *tvlv_value, + u16 tvlv_value_len), + u8 type, u8 version, u8 flags) +{ + struct batadv_tvlv_handler *tvlv_handler; + + spin_lock_bh(&bat_priv->tvlv.handler_list_lock); + + tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version); + if (tvlv_handler) { + spin_unlock_bh(&bat_priv->tvlv.handler_list_lock); + batadv_tvlv_handler_put(tvlv_handler); + return; + } + + tvlv_handler = kzalloc(sizeof(*tvlv_handler), GFP_ATOMIC); + if (!tvlv_handler) { + spin_unlock_bh(&bat_priv->tvlv.handler_list_lock); + return; + } + + tvlv_handler->ogm_handler = optr; + tvlv_handler->unicast_handler = uptr; + tvlv_handler->type = type; + tvlv_handler->version = version; + tvlv_handler->flags = flags; + kref_init(&tvlv_handler->refcount); + INIT_HLIST_NODE(&tvlv_handler->list); + + kref_get(&tvlv_handler->refcount); + hlist_add_head_rcu(&tvlv_handler->list, &bat_priv->tvlv.handler_list); + spin_unlock_bh(&bat_priv->tvlv.handler_list_lock); + + /* don't return reference to new tvlv_handler */ + batadv_tvlv_handler_put(tvlv_handler); +} + +/** + * batadv_tvlv_handler_unregister() - unregister tvlv handler based on the + * provided type and version (both need to match) + * @bat_priv: the bat priv with all the soft interface information + * @type: tvlv handler type to be unregistered + * @version: tvlv handler version to be unregistered + */ +void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv, + u8 type, u8 version) +{ + struct batadv_tvlv_handler *tvlv_handler; + + tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version); + if (!tvlv_handler) + return; + + batadv_tvlv_handler_put(tvlv_handler); + spin_lock_bh(&bat_priv->tvlv.handler_list_lock); + hlist_del_rcu(&tvlv_handler->list); + spin_unlock_bh(&bat_priv->tvlv.handler_list_lock); + batadv_tvlv_handler_put(tvlv_handler); +} + +/** + * batadv_tvlv_unicast_send() - send a unicast packet with tvlv payload to the + * specified host + * @bat_priv: the bat priv with all the soft interface information + * @src: source mac address of the unicast packet + * @dst: destination mac address of the unicast packet + * @type: tvlv type + * @version: tvlv version + * @tvlv_value: tvlv content + * @tvlv_value_len: tvlv content length + */ +void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, const u8 *src, + const u8 *dst, u8 type, u8 version, + void *tvlv_value, u16 tvlv_value_len) +{ + struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; + struct batadv_tvlv_hdr *tvlv_hdr; + struct batadv_orig_node *orig_node; + struct sk_buff *skb; + unsigned char *tvlv_buff; + unsigned int tvlv_len; + ssize_t hdr_len = sizeof(*unicast_tvlv_packet); + + orig_node = batadv_orig_hash_find(bat_priv, dst); + if (!orig_node) + return; + + tvlv_len = sizeof(*tvlv_hdr) + tvlv_value_len; + + skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + hdr_len + tvlv_len); + if (!skb) + goto out; + + skb->priority = TC_PRIO_CONTROL; + skb_reserve(skb, ETH_HLEN); + tvlv_buff = skb_put(skb, sizeof(*unicast_tvlv_packet) + tvlv_len); + unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)tvlv_buff; + unicast_tvlv_packet->packet_type = BATADV_UNICAST_TVLV; + unicast_tvlv_packet->version = BATADV_COMPAT_VERSION; + unicast_tvlv_packet->ttl = BATADV_TTL; + unicast_tvlv_packet->reserved = 0; + unicast_tvlv_packet->tvlv_len = htons(tvlv_len); + unicast_tvlv_packet->align = 0; + ether_addr_copy(unicast_tvlv_packet->src, src); + ether_addr_copy(unicast_tvlv_packet->dst, dst); + + tvlv_buff = (unsigned char *)(unicast_tvlv_packet + 1); + tvlv_hdr = (struct batadv_tvlv_hdr *)tvlv_buff; + tvlv_hdr->version = version; + tvlv_hdr->type = type; + tvlv_hdr->len = htons(tvlv_value_len); + tvlv_buff += sizeof(*tvlv_hdr); + memcpy(tvlv_buff, tvlv_value, tvlv_value_len); + + batadv_send_skb_to_orig(skb, orig_node, NULL); +out: + batadv_orig_node_put(orig_node); +} diff --git a/net/batman-adv/tvlv.h b/net/batman-adv/tvlv.h new file mode 100644 index 000000000..4cf8af00f --- /dev/null +++ b/net/batman-adv/tvlv.h @@ -0,0 +1,49 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + */ + +#ifndef _NET_BATMAN_ADV_TVLV_H_ +#define _NET_BATMAN_ADV_TVLV_H_ + +#include "main.h" + +#include <linux/types.h> +#include <uapi/linux/batadv_packet.h> + +void batadv_tvlv_container_register(struct batadv_priv *bat_priv, + u8 type, u8 version, + void *tvlv_value, u16 tvlv_value_len); +u16 batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv, + unsigned char **packet_buff, + int *packet_buff_len, int packet_min_len); +void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv, + struct batadv_ogm_packet *batadv_ogm_packet, + struct batadv_orig_node *orig_node); +void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv, + u8 type, u8 version); + +void batadv_tvlv_handler_register(struct batadv_priv *bat_priv, + void (*optr)(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig, + u8 flags, + void *tvlv_value, + u16 tvlv_value_len), + int (*uptr)(struct batadv_priv *bat_priv, + u8 *src, u8 *dst, + void *tvlv_value, + u16 tvlv_value_len), + u8 type, u8 version, u8 flags); +void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv, + u8 type, u8 version); +int batadv_tvlv_containers_process(struct batadv_priv *bat_priv, + bool ogm_source, + struct batadv_orig_node *orig_node, + u8 *src, u8 *dst, + void *tvlv_buff, u16 tvlv_buff_len); +void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, const u8 *src, + const u8 *dst, u8 type, u8 version, + void *tvlv_value, u16 tvlv_value_len); + +#endif /* _NET_BATMAN_ADV_TVLV_H_ */ diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h new file mode 100644 index 000000000..76791815b --- /dev/null +++ b/net/batman-adv/types.h @@ -0,0 +1,2378 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + */ + +#ifndef _NET_BATMAN_ADV_TYPES_H_ +#define _NET_BATMAN_ADV_TYPES_H_ + +#ifndef _NET_BATMAN_ADV_MAIN_H_ +#error only "main.h" can be included directly +#endif + +#include <linux/average.h> +#include <linux/bitops.h> +#include <linux/compiler.h> +#include <linux/if.h> +#include <linux/if_ether.h> +#include <linux/kref.h> +#include <linux/mutex.h> +#include <linux/netdevice.h> +#include <linux/netlink.h> +#include <linux/sched.h> /* for linux/wait.h */ +#include <linux/skbuff.h> +#include <linux/spinlock.h> +#include <linux/timer.h> +#include <linux/types.h> +#include <linux/wait.h> +#include <linux/workqueue.h> +#include <uapi/linux/batadv_packet.h> +#include <uapi/linux/batman_adv.h> + +#ifdef CONFIG_BATMAN_ADV_DAT + +/** + * typedef batadv_dat_addr_t - type used for all DHT addresses + * + * If it is changed, BATADV_DAT_ADDR_MAX is changed as well. + * + * *Please be careful: batadv_dat_addr_t must be UNSIGNED* + */ +typedef u16 batadv_dat_addr_t; + +#endif /* CONFIG_BATMAN_ADV_DAT */ + +/** + * enum batadv_dhcp_recipient - dhcp destination + */ +enum batadv_dhcp_recipient { + /** @BATADV_DHCP_NO: packet is not a dhcp message */ + BATADV_DHCP_NO = 0, + + /** @BATADV_DHCP_TO_SERVER: dhcp message is directed to a server */ + BATADV_DHCP_TO_SERVER, + + /** @BATADV_DHCP_TO_CLIENT: dhcp message is directed to a client */ + BATADV_DHCP_TO_CLIENT, +}; + +/** + * BATADV_TT_REMOTE_MASK - bitmask selecting the flags that are sent over the + * wire only + */ +#define BATADV_TT_REMOTE_MASK 0x00FF + +/** + * BATADV_TT_SYNC_MASK - bitmask of the flags that need to be kept in sync + * among the nodes. These flags are used to compute the global/local CRC + */ +#define BATADV_TT_SYNC_MASK 0x00F0 + +/** + * struct batadv_hard_iface_bat_iv - per hard-interface B.A.T.M.A.N. IV data + */ +struct batadv_hard_iface_bat_iv { + /** @ogm_buff: buffer holding the OGM packet */ + unsigned char *ogm_buff; + + /** @ogm_buff_len: length of the OGM packet buffer */ + int ogm_buff_len; + + /** @ogm_seqno: OGM sequence number - used to identify each OGM */ + atomic_t ogm_seqno; + + /** @ogm_buff_mutex: lock protecting ogm_buff and ogm_buff_len */ + struct mutex ogm_buff_mutex; +}; + +/** + * enum batadv_v_hard_iface_flags - interface flags useful to B.A.T.M.A.N. V + */ +enum batadv_v_hard_iface_flags { + /** + * @BATADV_FULL_DUPLEX: tells if the connection over this link is + * full-duplex + */ + BATADV_FULL_DUPLEX = BIT(0), + + /** + * @BATADV_WARNING_DEFAULT: tells whether we have warned the user that + * no throughput data is available for this interface and that default + * values are assumed. + */ + BATADV_WARNING_DEFAULT = BIT(1), +}; + +/** + * struct batadv_hard_iface_bat_v - per hard-interface B.A.T.M.A.N. V data + */ +struct batadv_hard_iface_bat_v { + /** @elp_interval: time interval between two ELP transmissions */ + atomic_t elp_interval; + + /** @elp_seqno: current ELP sequence number */ + atomic_t elp_seqno; + + /** @elp_skb: base skb containing the ELP message to send */ + struct sk_buff *elp_skb; + + /** @elp_wq: workqueue used to schedule ELP transmissions */ + struct delayed_work elp_wq; + + /** @aggr_wq: workqueue used to transmit queued OGM packets */ + struct delayed_work aggr_wq; + + /** @aggr_list: queue for to be aggregated OGM packets */ + struct sk_buff_head aggr_list; + + /** @aggr_len: size of the OGM aggregate (excluding ethernet header) */ + unsigned int aggr_len; + + /** + * @throughput_override: throughput override to disable link + * auto-detection + */ + atomic_t throughput_override; + + /** @flags: interface specific flags */ + u8 flags; +}; + +/** + * enum batadv_hard_iface_wifi_flags - Flags describing the wifi configuration + * of a batadv_hard_iface + */ +enum batadv_hard_iface_wifi_flags { + /** @BATADV_HARDIF_WIFI_WEXT_DIRECT: it is a wext wifi device */ + BATADV_HARDIF_WIFI_WEXT_DIRECT = BIT(0), + + /** @BATADV_HARDIF_WIFI_CFG80211_DIRECT: it is a cfg80211 wifi device */ + BATADV_HARDIF_WIFI_CFG80211_DIRECT = BIT(1), + + /** + * @BATADV_HARDIF_WIFI_WEXT_INDIRECT: link device is a wext wifi device + */ + BATADV_HARDIF_WIFI_WEXT_INDIRECT = BIT(2), + + /** + * @BATADV_HARDIF_WIFI_CFG80211_INDIRECT: link device is a cfg80211 wifi + * device + */ + BATADV_HARDIF_WIFI_CFG80211_INDIRECT = BIT(3), +}; + +/** + * struct batadv_hard_iface - network device known to batman-adv + */ +struct batadv_hard_iface { + /** @list: list node for batadv_hardif_list */ + struct list_head list; + + /** @if_status: status of the interface for batman-adv */ + char if_status; + + /** + * @num_bcasts: number of payload re-broadcasts on this interface (ARQ) + */ + u8 num_bcasts; + + /** + * @wifi_flags: flags whether this is (directly or indirectly) a wifi + * interface + */ + u32 wifi_flags; + + /** @net_dev: pointer to the net_device */ + struct net_device *net_dev; + + /** @refcount: number of contexts the object is used */ + struct kref refcount; + + /** + * @batman_adv_ptype: packet type describing packets that should be + * processed by batman-adv for this interface + */ + struct packet_type batman_adv_ptype; + + /** + * @soft_iface: the batman-adv interface which uses this network + * interface + */ + struct net_device *soft_iface; + + /** @rcu: struct used for freeing in an RCU-safe manner */ + struct rcu_head rcu; + + /** + * @hop_penalty: penalty which will be applied to the tq-field + * of an OGM received via this interface + */ + atomic_t hop_penalty; + + /** @bat_iv: per hard-interface B.A.T.M.A.N. IV data */ + struct batadv_hard_iface_bat_iv bat_iv; + +#ifdef CONFIG_BATMAN_ADV_BATMAN_V + /** @bat_v: per hard-interface B.A.T.M.A.N. V data */ + struct batadv_hard_iface_bat_v bat_v; +#endif + + /** + * @neigh_list: list of unique single hop neighbors via this interface + */ + struct hlist_head neigh_list; + + /** @neigh_list_lock: lock protecting neigh_list */ + spinlock_t neigh_list_lock; +}; + +/** + * struct batadv_orig_ifinfo_bat_iv - B.A.T.M.A.N. IV private orig_ifinfo + * members + */ +struct batadv_orig_ifinfo_bat_iv { + /** + * @bcast_own: bitfield which counts the number of our OGMs this + * orig_node rebroadcasted "back" to us (relative to last_real_seqno) + */ + DECLARE_BITMAP(bcast_own, BATADV_TQ_LOCAL_WINDOW_SIZE); + + /** @bcast_own_sum: sum of bcast_own */ + u8 bcast_own_sum; +}; + +/** + * struct batadv_orig_ifinfo - originator info per outgoing interface + */ +struct batadv_orig_ifinfo { + /** @list: list node for &batadv_orig_node.ifinfo_list */ + struct hlist_node list; + + /** @if_outgoing: pointer to outgoing hard-interface */ + struct batadv_hard_iface *if_outgoing; + + /** @router: router that should be used to reach this originator */ + struct batadv_neigh_node __rcu *router; + + /** @last_real_seqno: last and best known sequence number */ + u32 last_real_seqno; + + /** @last_ttl: ttl of last received packet */ + u8 last_ttl; + + /** @last_seqno_forwarded: seqno of the OGM which was forwarded last */ + u32 last_seqno_forwarded; + + /** @batman_seqno_reset: time when the batman seqno window was reset */ + unsigned long batman_seqno_reset; + + /** @bat_iv: B.A.T.M.A.N. IV private structure */ + struct batadv_orig_ifinfo_bat_iv bat_iv; + + /** @refcount: number of contexts the object is used */ + struct kref refcount; + + /** @rcu: struct used for freeing in an RCU-safe manner */ + struct rcu_head rcu; +}; + +/** + * struct batadv_frag_table_entry - head in the fragment buffer table + */ +struct batadv_frag_table_entry { + /** @fragment_list: head of list with fragments */ + struct hlist_head fragment_list; + + /** @lock: lock to protect the list of fragments */ + spinlock_t lock; + + /** @timestamp: time (jiffie) of last received fragment */ + unsigned long timestamp; + + /** @seqno: sequence number of the fragments in the list */ + u16 seqno; + + /** @size: accumulated size of packets in list */ + u16 size; + + /** @total_size: expected size of the assembled packet */ + u16 total_size; +}; + +/** + * struct batadv_frag_list_entry - entry in a list of fragments + */ +struct batadv_frag_list_entry { + /** @list: list node information */ + struct hlist_node list; + + /** @skb: fragment */ + struct sk_buff *skb; + + /** @no: fragment number in the set */ + u8 no; +}; + +/** + * struct batadv_vlan_tt - VLAN specific TT attributes + */ +struct batadv_vlan_tt { + /** @crc: CRC32 checksum of the entries belonging to this vlan */ + u32 crc; + + /** @num_entries: number of TT entries for this VLAN */ + atomic_t num_entries; +}; + +/** + * struct batadv_orig_node_vlan - VLAN specific data per orig_node + */ +struct batadv_orig_node_vlan { + /** @vid: the VLAN identifier */ + unsigned short vid; + + /** @tt: VLAN specific TT attributes */ + struct batadv_vlan_tt tt; + + /** @list: list node for &batadv_orig_node.vlan_list */ + struct hlist_node list; + + /** + * @refcount: number of context where this object is currently in use + */ + struct kref refcount; + + /** @rcu: struct used for freeing in a RCU-safe manner */ + struct rcu_head rcu; +}; + +/** + * struct batadv_orig_bat_iv - B.A.T.M.A.N. IV private orig_node members + */ +struct batadv_orig_bat_iv { + /** + * @ogm_cnt_lock: lock protecting &batadv_orig_ifinfo_bat_iv.bcast_own, + * &batadv_orig_ifinfo_bat_iv.bcast_own_sum, + * &batadv_neigh_ifinfo_bat_iv.bat_iv.real_bits and + * &batadv_neigh_ifinfo_bat_iv.real_packet_count + */ + spinlock_t ogm_cnt_lock; +}; + +/** + * struct batadv_orig_node - structure for orig_list maintaining nodes of mesh + */ +struct batadv_orig_node { + /** @orig: originator ethernet address */ + u8 orig[ETH_ALEN]; + + /** @ifinfo_list: list for routers per outgoing interface */ + struct hlist_head ifinfo_list; + + /** + * @last_bonding_candidate: pointer to last ifinfo of last used router + */ + struct batadv_orig_ifinfo *last_bonding_candidate; + +#ifdef CONFIG_BATMAN_ADV_DAT + /** @dat_addr: address of the orig node in the distributed hash */ + batadv_dat_addr_t dat_addr; +#endif + + /** @last_seen: time when last packet from this node was received */ + unsigned long last_seen; + + /** + * @bcast_seqno_reset: time when the broadcast seqno window was reset + */ + unsigned long bcast_seqno_reset; + +#ifdef CONFIG_BATMAN_ADV_MCAST + /** + * @mcast_handler_lock: synchronizes mcast-capability and -flag changes + */ + spinlock_t mcast_handler_lock; + + /** @mcast_flags: multicast flags announced by the orig node */ + u8 mcast_flags; + + /** + * @mcast_want_all_unsnoopables_node: a list node for the + * mcast.want_all_unsnoopables list + */ + struct hlist_node mcast_want_all_unsnoopables_node; + + /** + * @mcast_want_all_ipv4_node: a list node for the mcast.want_all_ipv4 + * list + */ + struct hlist_node mcast_want_all_ipv4_node; + /** + * @mcast_want_all_ipv6_node: a list node for the mcast.want_all_ipv6 + * list + */ + struct hlist_node mcast_want_all_ipv6_node; + + /** + * @mcast_want_all_rtr4_node: a list node for the mcast.want_all_rtr4 + * list + */ + struct hlist_node mcast_want_all_rtr4_node; + /** + * @mcast_want_all_rtr6_node: a list node for the mcast.want_all_rtr6 + * list + */ + struct hlist_node mcast_want_all_rtr6_node; +#endif + + /** @capabilities: announced capabilities of this originator */ + unsigned long capabilities; + + /** + * @capa_initialized: bitfield to remember whether a capability was + * initialized + */ + unsigned long capa_initialized; + + /** @last_ttvn: last seen translation table version number */ + atomic_t last_ttvn; + + /** @tt_buff: last tt changeset this node received from the orig node */ + unsigned char *tt_buff; + + /** + * @tt_buff_len: length of the last tt changeset this node received + * from the orig node + */ + s16 tt_buff_len; + + /** @tt_buff_lock: lock that protects tt_buff and tt_buff_len */ + spinlock_t tt_buff_lock; + + /** + * @tt_lock: avoids concurrent read from and write to the table. Table + * update is made up of two operations (data structure update and + * metadata -CRC/TTVN-recalculation) and they have to be executed + * atomically in order to avoid another thread to read the + * table/metadata between those. + */ + spinlock_t tt_lock; + + /** + * @bcast_bits: bitfield containing the info which payload broadcast + * originated from this orig node this host already has seen (relative + * to last_bcast_seqno) + */ + DECLARE_BITMAP(bcast_bits, BATADV_TQ_LOCAL_WINDOW_SIZE); + + /** + * @last_bcast_seqno: last broadcast sequence number received by this + * host + */ + u32 last_bcast_seqno; + + /** + * @neigh_list: list of potential next hop neighbor towards this orig + * node + */ + struct hlist_head neigh_list; + + /** + * @neigh_list_lock: lock protecting neigh_list, ifinfo_list, + * last_bonding_candidate and router + */ + spinlock_t neigh_list_lock; + + /** @hash_entry: hlist node for &batadv_priv.orig_hash */ + struct hlist_node hash_entry; + + /** @bat_priv: pointer to soft_iface this orig node belongs to */ + struct batadv_priv *bat_priv; + + /** @bcast_seqno_lock: lock protecting bcast_bits & last_bcast_seqno */ + spinlock_t bcast_seqno_lock; + + /** @refcount: number of contexts the object is used */ + struct kref refcount; + + /** @rcu: struct used for freeing in an RCU-safe manner */ + struct rcu_head rcu; + +#ifdef CONFIG_BATMAN_ADV_NC + /** @in_coding_list: list of nodes this orig can hear */ + struct list_head in_coding_list; + + /** @out_coding_list: list of nodes that can hear this orig */ + struct list_head out_coding_list; + + /** @in_coding_list_lock: protects in_coding_list */ + spinlock_t in_coding_list_lock; + + /** @out_coding_list_lock: protects out_coding_list */ + spinlock_t out_coding_list_lock; +#endif + + /** @fragments: array with heads for fragment chains */ + struct batadv_frag_table_entry fragments[BATADV_FRAG_BUFFER_COUNT]; + + /** + * @vlan_list: a list of orig_node_vlan structs, one per VLAN served by + * the originator represented by this object + */ + struct hlist_head vlan_list; + + /** @vlan_list_lock: lock protecting vlan_list */ + spinlock_t vlan_list_lock; + + /** @bat_iv: B.A.T.M.A.N. IV private structure */ + struct batadv_orig_bat_iv bat_iv; +}; + +/** + * enum batadv_orig_capabilities - orig node capabilities + */ +enum batadv_orig_capabilities { + /** + * @BATADV_ORIG_CAPA_HAS_DAT: orig node has distributed arp table + * enabled + */ + BATADV_ORIG_CAPA_HAS_DAT, + + /** @BATADV_ORIG_CAPA_HAS_NC: orig node has network coding enabled */ + BATADV_ORIG_CAPA_HAS_NC, + + /** @BATADV_ORIG_CAPA_HAS_TT: orig node has tt capability */ + BATADV_ORIG_CAPA_HAS_TT, + + /** + * @BATADV_ORIG_CAPA_HAS_MCAST: orig node has some multicast capability + * (= orig node announces a tvlv of type BATADV_TVLV_MCAST) + */ + BATADV_ORIG_CAPA_HAS_MCAST, +}; + +/** + * struct batadv_gw_node - structure for orig nodes announcing gw capabilities + */ +struct batadv_gw_node { + /** @list: list node for &batadv_priv_gw.list */ + struct hlist_node list; + + /** @orig_node: pointer to corresponding orig node */ + struct batadv_orig_node *orig_node; + + /** @bandwidth_down: advertised uplink download bandwidth */ + u32 bandwidth_down; + + /** @bandwidth_up: advertised uplink upload bandwidth */ + u32 bandwidth_up; + + /** @refcount: number of contexts the object is used */ + struct kref refcount; + + /** @rcu: struct used for freeing in an RCU-safe manner */ + struct rcu_head rcu; +}; + +DECLARE_EWMA(throughput, 10, 8) + +/** + * struct batadv_hardif_neigh_node_bat_v - B.A.T.M.A.N. V private neighbor + * information + */ +struct batadv_hardif_neigh_node_bat_v { + /** @throughput: ewma link throughput towards this neighbor */ + struct ewma_throughput throughput; + + /** @elp_interval: time interval between two ELP transmissions */ + u32 elp_interval; + + /** @elp_latest_seqno: latest and best known ELP sequence number */ + u32 elp_latest_seqno; + + /** + * @last_unicast_tx: when the last unicast packet has been sent to this + * neighbor + */ + unsigned long last_unicast_tx; + + /** @metric_work: work queue callback item for metric update */ + struct work_struct metric_work; +}; + +/** + * struct batadv_hardif_neigh_node - unique neighbor per hard-interface + */ +struct batadv_hardif_neigh_node { + /** @list: list node for &batadv_hard_iface.neigh_list */ + struct hlist_node list; + + /** @addr: the MAC address of the neighboring interface */ + u8 addr[ETH_ALEN]; + + /** + * @orig: the address of the originator this neighbor node belongs to + */ + u8 orig[ETH_ALEN]; + + /** @if_incoming: pointer to incoming hard-interface */ + struct batadv_hard_iface *if_incoming; + + /** @last_seen: when last packet via this neighbor was received */ + unsigned long last_seen; + +#ifdef CONFIG_BATMAN_ADV_BATMAN_V + /** @bat_v: B.A.T.M.A.N. V private data */ + struct batadv_hardif_neigh_node_bat_v bat_v; +#endif + + /** @refcount: number of contexts the object is used */ + struct kref refcount; + + /** @rcu: struct used for freeing in a RCU-safe manner */ + struct rcu_head rcu; +}; + +/** + * struct batadv_neigh_node - structure for single hops neighbors + */ +struct batadv_neigh_node { + /** @list: list node for &batadv_orig_node.neigh_list */ + struct hlist_node list; + + /** @orig_node: pointer to corresponding orig_node */ + struct batadv_orig_node *orig_node; + + /** @addr: the MAC address of the neighboring interface */ + u8 addr[ETH_ALEN]; + + /** @ifinfo_list: list for routing metrics per outgoing interface */ + struct hlist_head ifinfo_list; + + /** @ifinfo_lock: lock protecting ifinfo_list and its members */ + spinlock_t ifinfo_lock; + + /** @if_incoming: pointer to incoming hard-interface */ + struct batadv_hard_iface *if_incoming; + + /** @last_seen: when last packet via this neighbor was received */ + unsigned long last_seen; + + /** @hardif_neigh: hardif_neigh of this neighbor */ + struct batadv_hardif_neigh_node *hardif_neigh; + + /** @refcount: number of contexts the object is used */ + struct kref refcount; + + /** @rcu: struct used for freeing in an RCU-safe manner */ + struct rcu_head rcu; +}; + +/** + * struct batadv_neigh_ifinfo_bat_iv - neighbor information per outgoing + * interface for B.A.T.M.A.N. IV + */ +struct batadv_neigh_ifinfo_bat_iv { + /** @tq_recv: ring buffer of received TQ values from this neigh node */ + u8 tq_recv[BATADV_TQ_GLOBAL_WINDOW_SIZE]; + + /** @tq_index: ring buffer index */ + u8 tq_index; + + /** + * @tq_avg: averaged tq of all tq values in the ring buffer (tq_recv) + */ + u8 tq_avg; + + /** + * @real_bits: bitfield containing the number of OGMs received from this + * neigh node (relative to orig_node->last_real_seqno) + */ + DECLARE_BITMAP(real_bits, BATADV_TQ_LOCAL_WINDOW_SIZE); + + /** @real_packet_count: counted result of real_bits */ + u8 real_packet_count; +}; + +/** + * struct batadv_neigh_ifinfo_bat_v - neighbor information per outgoing + * interface for B.A.T.M.A.N. V + */ +struct batadv_neigh_ifinfo_bat_v { + /** + * @throughput: last throughput metric received from originator via this + * neigh + */ + u32 throughput; + + /** @last_seqno: last sequence number known for this neighbor */ + u32 last_seqno; +}; + +/** + * struct batadv_neigh_ifinfo - neighbor information per outgoing interface + */ +struct batadv_neigh_ifinfo { + /** @list: list node for &batadv_neigh_node.ifinfo_list */ + struct hlist_node list; + + /** @if_outgoing: pointer to outgoing hard-interface */ + struct batadv_hard_iface *if_outgoing; + + /** @bat_iv: B.A.T.M.A.N. IV private structure */ + struct batadv_neigh_ifinfo_bat_iv bat_iv; + +#ifdef CONFIG_BATMAN_ADV_BATMAN_V + /** @bat_v: B.A.T.M.A.N. V private data */ + struct batadv_neigh_ifinfo_bat_v bat_v; +#endif + + /** @last_ttl: last received ttl from this neigh node */ + u8 last_ttl; + + /** @refcount: number of contexts the object is used */ + struct kref refcount; + + /** @rcu: struct used for freeing in a RCU-safe manner */ + struct rcu_head rcu; +}; + +#ifdef CONFIG_BATMAN_ADV_BLA + +/** + * struct batadv_bcast_duplist_entry - structure for LAN broadcast suppression + */ +struct batadv_bcast_duplist_entry { + /** @orig: mac address of orig node originating the broadcast */ + u8 orig[ETH_ALEN]; + + /** @crc: crc32 checksum of broadcast payload */ + __be32 crc; + + /** @entrytime: time when the broadcast packet was received */ + unsigned long entrytime; +}; +#endif + +/** + * enum batadv_counters - indices for traffic counters + */ +enum batadv_counters { + /** @BATADV_CNT_TX: transmitted payload traffic packet counter */ + BATADV_CNT_TX, + + /** @BATADV_CNT_TX_BYTES: transmitted payload traffic bytes counter */ + BATADV_CNT_TX_BYTES, + + /** + * @BATADV_CNT_TX_DROPPED: dropped transmission payload traffic packet + * counter + */ + BATADV_CNT_TX_DROPPED, + + /** @BATADV_CNT_RX: received payload traffic packet counter */ + BATADV_CNT_RX, + + /** @BATADV_CNT_RX_BYTES: received payload traffic bytes counter */ + BATADV_CNT_RX_BYTES, + + /** @BATADV_CNT_FORWARD: forwarded payload traffic packet counter */ + BATADV_CNT_FORWARD, + + /** + * @BATADV_CNT_FORWARD_BYTES: forwarded payload traffic bytes counter + */ + BATADV_CNT_FORWARD_BYTES, + + /** + * @BATADV_CNT_MGMT_TX: transmitted routing protocol traffic packet + * counter + */ + BATADV_CNT_MGMT_TX, + + /** + * @BATADV_CNT_MGMT_TX_BYTES: transmitted routing protocol traffic bytes + * counter + */ + BATADV_CNT_MGMT_TX_BYTES, + + /** + * @BATADV_CNT_MGMT_RX: received routing protocol traffic packet counter + */ + BATADV_CNT_MGMT_RX, + + /** + * @BATADV_CNT_MGMT_RX_BYTES: received routing protocol traffic bytes + * counter + */ + BATADV_CNT_MGMT_RX_BYTES, + + /** @BATADV_CNT_FRAG_TX: transmitted fragment traffic packet counter */ + BATADV_CNT_FRAG_TX, + + /** + * @BATADV_CNT_FRAG_TX_BYTES: transmitted fragment traffic bytes counter + */ + BATADV_CNT_FRAG_TX_BYTES, + + /** @BATADV_CNT_FRAG_RX: received fragment traffic packet counter */ + BATADV_CNT_FRAG_RX, + + /** + * @BATADV_CNT_FRAG_RX_BYTES: received fragment traffic bytes counter + */ + BATADV_CNT_FRAG_RX_BYTES, + + /** @BATADV_CNT_FRAG_FWD: forwarded fragment traffic packet counter */ + BATADV_CNT_FRAG_FWD, + + /** + * @BATADV_CNT_FRAG_FWD_BYTES: forwarded fragment traffic bytes counter + */ + BATADV_CNT_FRAG_FWD_BYTES, + + /** + * @BATADV_CNT_TT_REQUEST_TX: transmitted tt req traffic packet counter + */ + BATADV_CNT_TT_REQUEST_TX, + + /** @BATADV_CNT_TT_REQUEST_RX: received tt req traffic packet counter */ + BATADV_CNT_TT_REQUEST_RX, + + /** + * @BATADV_CNT_TT_RESPONSE_TX: transmitted tt resp traffic packet + * counter + */ + BATADV_CNT_TT_RESPONSE_TX, + + /** + * @BATADV_CNT_TT_RESPONSE_RX: received tt resp traffic packet counter + */ + BATADV_CNT_TT_RESPONSE_RX, + + /** + * @BATADV_CNT_TT_ROAM_ADV_TX: transmitted tt roam traffic packet + * counter + */ + BATADV_CNT_TT_ROAM_ADV_TX, + + /** + * @BATADV_CNT_TT_ROAM_ADV_RX: received tt roam traffic packet counter + */ + BATADV_CNT_TT_ROAM_ADV_RX, + +#ifdef CONFIG_BATMAN_ADV_DAT + /** + * @BATADV_CNT_DAT_GET_TX: transmitted dht GET traffic packet counter + */ + BATADV_CNT_DAT_GET_TX, + + /** @BATADV_CNT_DAT_GET_RX: received dht GET traffic packet counter */ + BATADV_CNT_DAT_GET_RX, + + /** + * @BATADV_CNT_DAT_PUT_TX: transmitted dht PUT traffic packet counter + */ + BATADV_CNT_DAT_PUT_TX, + + /** @BATADV_CNT_DAT_PUT_RX: received dht PUT traffic packet counter */ + BATADV_CNT_DAT_PUT_RX, + + /** + * @BATADV_CNT_DAT_CACHED_REPLY_TX: transmitted dat cache reply traffic + * packet counter + */ + BATADV_CNT_DAT_CACHED_REPLY_TX, +#endif + +#ifdef CONFIG_BATMAN_ADV_NC + /** + * @BATADV_CNT_NC_CODE: transmitted nc-combined traffic packet counter + */ + BATADV_CNT_NC_CODE, + + /** + * @BATADV_CNT_NC_CODE_BYTES: transmitted nc-combined traffic bytes + * counter + */ + BATADV_CNT_NC_CODE_BYTES, + + /** + * @BATADV_CNT_NC_RECODE: transmitted nc-recombined traffic packet + * counter + */ + BATADV_CNT_NC_RECODE, + + /** + * @BATADV_CNT_NC_RECODE_BYTES: transmitted nc-recombined traffic bytes + * counter + */ + BATADV_CNT_NC_RECODE_BYTES, + + /** + * @BATADV_CNT_NC_BUFFER: counter for packets buffered for later nc + * decoding + */ + BATADV_CNT_NC_BUFFER, + + /** + * @BATADV_CNT_NC_DECODE: received and nc-decoded traffic packet counter + */ + BATADV_CNT_NC_DECODE, + + /** + * @BATADV_CNT_NC_DECODE_BYTES: received and nc-decoded traffic bytes + * counter + */ + BATADV_CNT_NC_DECODE_BYTES, + + /** + * @BATADV_CNT_NC_DECODE_FAILED: received and decode-failed traffic + * packet counter + */ + BATADV_CNT_NC_DECODE_FAILED, + + /** + * @BATADV_CNT_NC_SNIFFED: counter for nc-decoded packets received in + * promisc mode. + */ + BATADV_CNT_NC_SNIFFED, +#endif + + /** @BATADV_CNT_NUM: number of traffic counters */ + BATADV_CNT_NUM, +}; + +/** + * struct batadv_priv_tt - per mesh interface translation table data + */ +struct batadv_priv_tt { + /** @vn: translation table version number */ + atomic_t vn; + + /** + * @ogm_append_cnt: counter of number of OGMs containing the local tt + * diff + */ + atomic_t ogm_append_cnt; + + /** @local_changes: changes registered in an originator interval */ + atomic_t local_changes; + + /** + * @changes_list: tracks tt local changes within an originator interval + */ + struct list_head changes_list; + + /** @local_hash: local translation table hash table */ + struct batadv_hashtable *local_hash; + + /** @global_hash: global translation table hash table */ + struct batadv_hashtable *global_hash; + + /** @req_list: list of pending & unanswered tt_requests */ + struct hlist_head req_list; + + /** + * @roam_list: list of the last roaming events of each client limiting + * the number of roaming events to avoid route flapping + */ + struct list_head roam_list; + + /** @changes_list_lock: lock protecting changes_list */ + spinlock_t changes_list_lock; + + /** @req_list_lock: lock protecting req_list */ + spinlock_t req_list_lock; + + /** @roam_list_lock: lock protecting roam_list */ + spinlock_t roam_list_lock; + + /** @last_changeset: last tt changeset this host has generated */ + unsigned char *last_changeset; + + /** + * @last_changeset_len: length of last tt changeset this host has + * generated + */ + s16 last_changeset_len; + + /** + * @last_changeset_lock: lock protecting last_changeset & + * last_changeset_len + */ + spinlock_t last_changeset_lock; + + /** + * @commit_lock: prevents from executing a local TT commit while reading + * the local table. The local TT commit is made up of two operations + * (data structure update and metadata -CRC/TTVN- recalculation) and + * they have to be executed atomically in order to avoid another thread + * to read the table/metadata between those. + */ + spinlock_t commit_lock; + + /** @work: work queue callback item for translation table purging */ + struct delayed_work work; +}; + +#ifdef CONFIG_BATMAN_ADV_BLA + +/** + * struct batadv_priv_bla - per mesh interface bridge loop avoidance data + */ +struct batadv_priv_bla { + /** @num_requests: number of bla requests in flight */ + atomic_t num_requests; + + /** + * @claim_hash: hash table containing mesh nodes this host has claimed + */ + struct batadv_hashtable *claim_hash; + + /** + * @backbone_hash: hash table containing all detected backbone gateways + */ + struct batadv_hashtable *backbone_hash; + + /** @loopdetect_addr: MAC address used for own loopdetection frames */ + u8 loopdetect_addr[ETH_ALEN]; + + /** + * @loopdetect_lasttime: time when the loopdetection frames were sent + */ + unsigned long loopdetect_lasttime; + + /** + * @loopdetect_next: how many periods to wait for the next loopdetect + * process + */ + atomic_t loopdetect_next; + + /** + * @bcast_duplist: recently received broadcast packets array (for + * broadcast duplicate suppression) + */ + struct batadv_bcast_duplist_entry bcast_duplist[BATADV_DUPLIST_SIZE]; + + /** + * @bcast_duplist_curr: index of last broadcast packet added to + * bcast_duplist + */ + int bcast_duplist_curr; + + /** + * @bcast_duplist_lock: lock protecting bcast_duplist & + * bcast_duplist_curr + */ + spinlock_t bcast_duplist_lock; + + /** @claim_dest: local claim data (e.g. claim group) */ + struct batadv_bla_claim_dst claim_dest; + + /** @work: work queue callback item for cleanups & bla announcements */ + struct delayed_work work; +}; +#endif + +#ifdef CONFIG_BATMAN_ADV_DEBUG + +/** + * struct batadv_priv_debug_log - debug logging data + */ +struct batadv_priv_debug_log { + /** @log_buff: buffer holding the logs (ring buffer) */ + char log_buff[BATADV_LOG_BUF_LEN]; + + /** @log_start: index of next character to read */ + unsigned long log_start; + + /** @log_end: index of next character to write */ + unsigned long log_end; + + /** @lock: lock protecting log_buff, log_start & log_end */ + spinlock_t lock; + + /** @queue_wait: log reader's wait queue */ + wait_queue_head_t queue_wait; +}; +#endif + +/** + * struct batadv_priv_gw - per mesh interface gateway data + */ +struct batadv_priv_gw { + /** @gateway_list: list of available gateway nodes */ + struct hlist_head gateway_list; + + /** @list_lock: lock protecting gateway_list, curr_gw, generation */ + spinlock_t list_lock; + + /** @curr_gw: pointer to currently selected gateway node */ + struct batadv_gw_node __rcu *curr_gw; + + /** @generation: current (generation) sequence number */ + unsigned int generation; + + /** + * @mode: gateway operation: off, client or server (see batadv_gw_modes) + */ + atomic_t mode; + + /** @sel_class: gateway selection class (applies if gw_mode client) */ + atomic_t sel_class; + + /** + * @bandwidth_down: advertised uplink download bandwidth (if gw_mode + * server) + */ + atomic_t bandwidth_down; + + /** + * @bandwidth_up: advertised uplink upload bandwidth (if gw_mode server) + */ + atomic_t bandwidth_up; + + /** @reselect: bool indicating a gateway re-selection is in progress */ + atomic_t reselect; +}; + +/** + * struct batadv_priv_tvlv - per mesh interface tvlv data + */ +struct batadv_priv_tvlv { + /** + * @container_list: list of registered tvlv containers to be sent with + * each OGM + */ + struct hlist_head container_list; + + /** @handler_list: list of the various tvlv content handlers */ + struct hlist_head handler_list; + + /** @container_list_lock: protects tvlv container list access */ + spinlock_t container_list_lock; + + /** @handler_list_lock: protects handler list access */ + spinlock_t handler_list_lock; +}; + +#ifdef CONFIG_BATMAN_ADV_DAT + +/** + * struct batadv_priv_dat - per mesh interface DAT private data + */ +struct batadv_priv_dat { + /** @addr: node DAT address */ + batadv_dat_addr_t addr; + + /** @hash: hashtable representing the local ARP cache */ + struct batadv_hashtable *hash; + + /** @work: work queue callback item for cache purging */ + struct delayed_work work; +}; +#endif + +#ifdef CONFIG_BATMAN_ADV_MCAST +/** + * struct batadv_mcast_querier_state - IGMP/MLD querier state when bridged + */ +struct batadv_mcast_querier_state { + /** @exists: whether a querier exists in the mesh */ + unsigned char exists:1; + + /** + * @shadowing: if a querier exists, whether it is potentially shadowing + * multicast listeners (i.e. querier is behind our own bridge segment) + */ + unsigned char shadowing:1; +}; + +/** + * struct batadv_mcast_mla_flags - flags for the querier, bridge and tvlv state + */ +struct batadv_mcast_mla_flags { + /** @querier_ipv4: the current state of an IGMP querier in the mesh */ + struct batadv_mcast_querier_state querier_ipv4; + + /** @querier_ipv6: the current state of an MLD querier in the mesh */ + struct batadv_mcast_querier_state querier_ipv6; + + /** @enabled: whether the multicast tvlv is currently enabled */ + unsigned char enabled:1; + + /** @bridged: whether the soft interface has a bridge on top */ + unsigned char bridged:1; + + /** @tvlv_flags: the flags we have last sent in our mcast tvlv */ + u8 tvlv_flags; +}; + +/** + * struct batadv_priv_mcast - per mesh interface mcast data + */ +struct batadv_priv_mcast { + /** + * @mla_list: list of multicast addresses we are currently announcing + * via TT + */ + struct hlist_head mla_list; /* see __batadv_mcast_mla_update() */ + + /** + * @want_all_unsnoopables_list: a list of orig_nodes wanting all + * unsnoopable multicast traffic + */ + struct hlist_head want_all_unsnoopables_list; + + /** + * @want_all_ipv4_list: a list of orig_nodes wanting all IPv4 multicast + * traffic + */ + struct hlist_head want_all_ipv4_list; + + /** + * @want_all_ipv6_list: a list of orig_nodes wanting all IPv6 multicast + * traffic + */ + struct hlist_head want_all_ipv6_list; + + /** + * @want_all_rtr4_list: a list of orig_nodes wanting all routable IPv4 + * multicast traffic + */ + struct hlist_head want_all_rtr4_list; + + /** + * @want_all_rtr6_list: a list of orig_nodes wanting all routable IPv6 + * multicast traffic + */ + struct hlist_head want_all_rtr6_list; + + /** + * @mla_flags: flags for the querier, bridge and tvlv state + */ + struct batadv_mcast_mla_flags mla_flags; + + /** + * @mla_lock: a lock protecting mla_list and mla_flags + */ + spinlock_t mla_lock; + + /** + * @num_want_all_unsnoopables: number of nodes wanting unsnoopable IP + * traffic + */ + atomic_t num_want_all_unsnoopables; + + /** @num_want_all_ipv4: counter for items in want_all_ipv4_list */ + atomic_t num_want_all_ipv4; + + /** @num_want_all_ipv6: counter for items in want_all_ipv6_list */ + atomic_t num_want_all_ipv6; + + /** @num_want_all_rtr4: counter for items in want_all_rtr4_list */ + atomic_t num_want_all_rtr4; + + /** @num_want_all_rtr6: counter for items in want_all_rtr6_list */ + atomic_t num_want_all_rtr6; + + /** + * @want_lists_lock: lock for protecting modifications to mcasts + * want_all_{unsnoopables,ipv4,ipv6}_list (traversals are rcu-locked) + */ + spinlock_t want_lists_lock; + + /** @work: work queue callback item for multicast TT and TVLV updates */ + struct delayed_work work; +}; +#endif + +/** + * struct batadv_priv_nc - per mesh interface network coding private data + */ +struct batadv_priv_nc { + /** @work: work queue callback item for cleanup */ + struct delayed_work work; + + /** + * @min_tq: only consider neighbors for encoding if neigh_tq > min_tq + */ + u8 min_tq; + + /** + * @max_fwd_delay: maximum packet forward delay to allow coding of + * packets + */ + u32 max_fwd_delay; + + /** + * @max_buffer_time: buffer time for sniffed packets used to decoding + */ + u32 max_buffer_time; + + /** + * @timestamp_fwd_flush: timestamp of last forward packet queue flush + */ + unsigned long timestamp_fwd_flush; + + /** + * @timestamp_sniffed_purge: timestamp of last sniffed packet queue + * purge + */ + unsigned long timestamp_sniffed_purge; + + /** + * @coding_hash: Hash table used to buffer skbs while waiting for + * another incoming skb to code it with. Skbs are added to the buffer + * just before being forwarded in routing.c + */ + struct batadv_hashtable *coding_hash; + + /** + * @decoding_hash: Hash table used to buffer skbs that might be needed + * to decode a received coded skb. The buffer is used for 1) skbs + * arriving on the soft-interface; 2) skbs overheard on the + * hard-interface; and 3) skbs forwarded by batman-adv. + */ + struct batadv_hashtable *decoding_hash; +}; + +/** + * struct batadv_tp_unacked - unacked packet meta-information + * + * This struct is supposed to represent a buffer unacked packet. However, since + * the purpose of the TP meter is to count the traffic only, there is no need to + * store the entire sk_buff, the starting offset and the length are enough + */ +struct batadv_tp_unacked { + /** @seqno: seqno of the unacked packet */ + u32 seqno; + + /** @len: length of the packet */ + u16 len; + + /** @list: list node for &batadv_tp_vars.unacked_list */ + struct list_head list; +}; + +/** + * enum batadv_tp_meter_role - Modus in tp meter session + */ +enum batadv_tp_meter_role { + /** @BATADV_TP_RECEIVER: Initialized as receiver */ + BATADV_TP_RECEIVER, + + /** @BATADV_TP_SENDER: Initialized as sender */ + BATADV_TP_SENDER +}; + +/** + * struct batadv_tp_vars - tp meter private variables per session + */ +struct batadv_tp_vars { + /** @list: list node for &bat_priv.tp_list */ + struct hlist_node list; + + /** @timer: timer for ack (receiver) and retry (sender) */ + struct timer_list timer; + + /** @bat_priv: pointer to the mesh object */ + struct batadv_priv *bat_priv; + + /** @start_time: start time in jiffies */ + unsigned long start_time; + + /** @other_end: mac address of remote */ + u8 other_end[ETH_ALEN]; + + /** @role: receiver/sender modi */ + enum batadv_tp_meter_role role; + + /** @sending: sending binary semaphore: 1 if sending, 0 is not */ + atomic_t sending; + + /** @reason: reason for a stopped session */ + enum batadv_tp_meter_reason reason; + + /** @finish_work: work item for the finishing procedure */ + struct delayed_work finish_work; + + /** @test_length: test length in milliseconds */ + u32 test_length; + + /** @session: TP session identifier */ + u8 session[2]; + + /** @icmp_uid: local ICMP "socket" index */ + u8 icmp_uid; + + /* sender variables */ + + /** @dec_cwnd: decimal part of the cwnd used during linear growth */ + u16 dec_cwnd; + + /** @cwnd: current size of the congestion window */ + u32 cwnd; + + /** @cwnd_lock: lock do protect @cwnd & @dec_cwnd */ + spinlock_t cwnd_lock; + + /** + * @ss_threshold: Slow Start threshold. Once cwnd exceeds this value the + * connection switches to the Congestion Avoidance state + */ + u32 ss_threshold; + + /** @last_acked: last acked byte */ + atomic_t last_acked; + + /** @last_sent: last sent byte, not yet acked */ + u32 last_sent; + + /** @tot_sent: amount of data sent/ACKed so far */ + atomic64_t tot_sent; + + /** @dup_acks: duplicate ACKs counter */ + atomic_t dup_acks; + + /** @fast_recovery: true if in Fast Recovery mode */ + unsigned char fast_recovery:1; + + /** @recover: last sent seqno when entering Fast Recovery */ + u32 recover; + + /** @rto: sender timeout */ + u32 rto; + + /** @srtt: smoothed RTT scaled by 2^3 */ + u32 srtt; + + /** @rttvar: RTT variation scaled by 2^2 */ + u32 rttvar; + + /** + * @more_bytes: waiting queue anchor when waiting for more ack/retry + * timeout + */ + wait_queue_head_t more_bytes; + + /** @prerandom_offset: offset inside the prerandom buffer */ + u32 prerandom_offset; + + /** @prerandom_lock: spinlock protecting access to prerandom_offset */ + spinlock_t prerandom_lock; + + /* receiver variables */ + + /** @last_recv: last in-order received packet */ + u32 last_recv; + + /** @unacked_list: list of unacked packets (meta-info only) */ + struct list_head unacked_list; + + /** @unacked_lock: protect unacked_list */ + spinlock_t unacked_lock; + + /** @last_recv_time: time (jiffies) a msg was received */ + unsigned long last_recv_time; + + /** @refcount: number of context where the object is used */ + struct kref refcount; + + /** @rcu: struct used for freeing in an RCU-safe manner */ + struct rcu_head rcu; +}; + +/** + * struct batadv_softif_vlan - per VLAN attributes set + */ +struct batadv_softif_vlan { + /** @bat_priv: pointer to the mesh object */ + struct batadv_priv *bat_priv; + + /** @vid: VLAN identifier */ + unsigned short vid; + + /** @ap_isolation: AP isolation state */ + atomic_t ap_isolation; /* boolean */ + + /** @tt: TT private attributes (VLAN specific) */ + struct batadv_vlan_tt tt; + + /** @list: list node for &bat_priv.softif_vlan_list */ + struct hlist_node list; + + /** + * @refcount: number of context where this object is currently in use + */ + struct kref refcount; + + /** @rcu: struct used for freeing in a RCU-safe manner */ + struct rcu_head rcu; +}; + +/** + * struct batadv_priv_bat_v - B.A.T.M.A.N. V per soft-interface private data + */ +struct batadv_priv_bat_v { + /** @ogm_buff: buffer holding the OGM packet */ + unsigned char *ogm_buff; + + /** @ogm_buff_len: length of the OGM packet buffer */ + int ogm_buff_len; + + /** @ogm_seqno: OGM sequence number - used to identify each OGM */ + atomic_t ogm_seqno; + + /** @ogm_buff_mutex: lock protecting ogm_buff and ogm_buff_len */ + struct mutex ogm_buff_mutex; + + /** @ogm_wq: workqueue used to schedule OGM transmissions */ + struct delayed_work ogm_wq; +}; + +/** + * struct batadv_priv - per mesh interface data + */ +struct batadv_priv { + /** + * @mesh_state: current status of the mesh + * (inactive/active/deactivating) + */ + atomic_t mesh_state; + + /** @soft_iface: net device which holds this struct as private data */ + struct net_device *soft_iface; + + /** + * @mtu_set_by_user: MTU was set once by user + * protected by rtnl_lock + */ + int mtu_set_by_user; + + /** + * @bat_counters: mesh internal traffic statistic counters (see + * batadv_counters) + */ + u64 __percpu *bat_counters; /* Per cpu counters */ + + /** + * @aggregated_ogms: bool indicating whether OGM aggregation is enabled + */ + atomic_t aggregated_ogms; + + /** @bonding: bool indicating whether traffic bonding is enabled */ + atomic_t bonding; + + /** + * @fragmentation: bool indicating whether traffic fragmentation is + * enabled + */ + atomic_t fragmentation; + + /** + * @packet_size_max: max packet size that can be transmitted via + * multiple fragmented skbs or a single frame if fragmentation is + * disabled + */ + atomic_t packet_size_max; + + /** + * @frag_seqno: incremental counter to identify chains of egress + * fragments + */ + atomic_t frag_seqno; + +#ifdef CONFIG_BATMAN_ADV_BLA + /** + * @bridge_loop_avoidance: bool indicating whether bridge loop + * avoidance is enabled + */ + atomic_t bridge_loop_avoidance; +#endif + +#ifdef CONFIG_BATMAN_ADV_DAT + /** + * @distributed_arp_table: bool indicating whether distributed ARP table + * is enabled + */ + atomic_t distributed_arp_table; +#endif + +#ifdef CONFIG_BATMAN_ADV_MCAST + /** + * @multicast_mode: Enable or disable multicast optimizations on this + * node's sender/originating side + */ + atomic_t multicast_mode; + + /** + * @multicast_fanout: Maximum number of packet copies to generate for a + * multicast-to-unicast conversion + */ + atomic_t multicast_fanout; +#endif + + /** @orig_interval: OGM broadcast interval in milliseconds */ + atomic_t orig_interval; + + /** + * @hop_penalty: penalty which will be applied to an OGM's tq-field on + * every hop + */ + atomic_t hop_penalty; + +#ifdef CONFIG_BATMAN_ADV_DEBUG + /** @log_level: configured log level (see batadv_dbg_level) */ + atomic_t log_level; +#endif + + /** + * @isolation_mark: the skb->mark value used to match packets for AP + * isolation + */ + u32 isolation_mark; + + /** + * @isolation_mark_mask: bitmask identifying the bits in skb->mark to be + * used for the isolation mark + */ + u32 isolation_mark_mask; + + /** @bcast_seqno: last sent broadcast packet sequence number */ + atomic_t bcast_seqno; + + /** + * @bcast_queue_left: number of remaining buffered broadcast packet + * slots + */ + atomic_t bcast_queue_left; + + /** @batman_queue_left: number of remaining OGM packet slots */ + atomic_t batman_queue_left; + + /** @forw_bat_list: list of aggregated OGMs that will be forwarded */ + struct hlist_head forw_bat_list; + + /** + * @forw_bcast_list: list of broadcast packets that will be + * rebroadcasted + */ + struct hlist_head forw_bcast_list; + + /** @tp_list: list of tp sessions */ + struct hlist_head tp_list; + + /** @orig_hash: hash table containing mesh participants (orig nodes) */ + struct batadv_hashtable *orig_hash; + + /** @forw_bat_list_lock: lock protecting forw_bat_list */ + spinlock_t forw_bat_list_lock; + + /** @forw_bcast_list_lock: lock protecting forw_bcast_list */ + spinlock_t forw_bcast_list_lock; + + /** @tp_list_lock: spinlock protecting @tp_list */ + spinlock_t tp_list_lock; + + /** @tp_num: number of currently active tp sessions */ + atomic_t tp_num; + + /** @orig_work: work queue callback item for orig node purging */ + struct delayed_work orig_work; + + /** + * @primary_if: one of the hard-interfaces assigned to this mesh + * interface becomes the primary interface + */ + struct batadv_hard_iface __rcu *primary_if; /* rcu protected pointer */ + + /** @algo_ops: routing algorithm used by this mesh interface */ + struct batadv_algo_ops *algo_ops; + + /** + * @softif_vlan_list: a list of softif_vlan structs, one per VLAN + * created on top of the mesh interface represented by this object + */ + struct hlist_head softif_vlan_list; + + /** @softif_vlan_list_lock: lock protecting softif_vlan_list */ + spinlock_t softif_vlan_list_lock; + +#ifdef CONFIG_BATMAN_ADV_BLA + /** @bla: bridge loop avoidance data */ + struct batadv_priv_bla bla; +#endif + +#ifdef CONFIG_BATMAN_ADV_DEBUG + /** @debug_log: holding debug logging relevant data */ + struct batadv_priv_debug_log *debug_log; +#endif + + /** @gw: gateway data */ + struct batadv_priv_gw gw; + + /** @tt: translation table data */ + struct batadv_priv_tt tt; + + /** @tvlv: type-version-length-value data */ + struct batadv_priv_tvlv tvlv; + +#ifdef CONFIG_BATMAN_ADV_DAT + /** @dat: distributed arp table data */ + struct batadv_priv_dat dat; +#endif + +#ifdef CONFIG_BATMAN_ADV_MCAST + /** @mcast: multicast data */ + struct batadv_priv_mcast mcast; +#endif + +#ifdef CONFIG_BATMAN_ADV_NC + /** + * @network_coding: bool indicating whether network coding is enabled + */ + atomic_t network_coding; + + /** @nc: network coding data */ + struct batadv_priv_nc nc; +#endif /* CONFIG_BATMAN_ADV_NC */ + +#ifdef CONFIG_BATMAN_ADV_BATMAN_V + /** @bat_v: B.A.T.M.A.N. V per soft-interface private data */ + struct batadv_priv_bat_v bat_v; +#endif +}; + +#ifdef CONFIG_BATMAN_ADV_BLA + +/** + * struct batadv_bla_backbone_gw - batman-adv gateway bridged into the LAN + */ +struct batadv_bla_backbone_gw { + /** + * @orig: originator address of backbone node (mac address of primary + * iface) + */ + u8 orig[ETH_ALEN]; + + /** @vid: vlan id this gateway was detected on */ + unsigned short vid; + + /** @hash_entry: hlist node for &batadv_priv_bla.backbone_hash */ + struct hlist_node hash_entry; + + /** @bat_priv: pointer to soft_iface this backbone gateway belongs to */ + struct batadv_priv *bat_priv; + + /** @lasttime: last time we heard of this backbone gw */ + unsigned long lasttime; + + /** + * @wait_periods: grace time for bridge forward delays and bla group + * forming at bootup phase - no bcast traffic is formwared until it has + * elapsed + */ + atomic_t wait_periods; + + /** + * @request_sent: if this bool is set to true we are out of sync with + * this backbone gateway - no bcast traffic is formwared until the + * situation was resolved + */ + atomic_t request_sent; + + /** @crc: crc16 checksum over all claims */ + u16 crc; + + /** @crc_lock: lock protecting crc */ + spinlock_t crc_lock; + + /** @report_work: work struct for reporting detected loops */ + struct work_struct report_work; + + /** @refcount: number of contexts the object is used */ + struct kref refcount; + + /** @rcu: struct used for freeing in an RCU-safe manner */ + struct rcu_head rcu; +}; + +/** + * struct batadv_bla_claim - claimed non-mesh client structure + */ +struct batadv_bla_claim { + /** @addr: mac address of claimed non-mesh client */ + u8 addr[ETH_ALEN]; + + /** @vid: vlan id this client was detected on */ + unsigned short vid; + + /** @backbone_gw: pointer to backbone gw claiming this client */ + struct batadv_bla_backbone_gw *backbone_gw; + + /** @backbone_lock: lock protecting backbone_gw pointer */ + spinlock_t backbone_lock; + + /** @lasttime: last time we heard of claim (locals only) */ + unsigned long lasttime; + + /** @hash_entry: hlist node for &batadv_priv_bla.claim_hash */ + struct hlist_node hash_entry; + + /** @refcount: number of contexts the object is used */ + struct rcu_head rcu; + + /** @rcu: struct used for freeing in an RCU-safe manner */ + struct kref refcount; +}; +#endif + +/** + * struct batadv_tt_common_entry - tt local & tt global common data + */ +struct batadv_tt_common_entry { + /** @addr: mac address of non-mesh client */ + u8 addr[ETH_ALEN]; + + /** @vid: VLAN identifier */ + unsigned short vid; + + /** + * @hash_entry: hlist node for &batadv_priv_tt.local_hash or for + * &batadv_priv_tt.global_hash + */ + struct hlist_node hash_entry; + + /** @flags: various state handling flags (see batadv_tt_client_flags) */ + u16 flags; + + /** @added_at: timestamp used for purging stale tt common entries */ + unsigned long added_at; + + /** @refcount: number of contexts the object is used */ + struct kref refcount; + + /** @rcu: struct used for freeing in an RCU-safe manner */ + struct rcu_head rcu; +}; + +/** + * struct batadv_tt_local_entry - translation table local entry data + */ +struct batadv_tt_local_entry { + /** @common: general translation table data */ + struct batadv_tt_common_entry common; + + /** @last_seen: timestamp used for purging stale tt local entries */ + unsigned long last_seen; + + /** @vlan: soft-interface vlan of the entry */ + struct batadv_softif_vlan *vlan; +}; + +/** + * struct batadv_tt_global_entry - translation table global entry data + */ +struct batadv_tt_global_entry { + /** @common: general translation table data */ + struct batadv_tt_common_entry common; + + /** @orig_list: list of orig nodes announcing this non-mesh client */ + struct hlist_head orig_list; + + /** @orig_list_count: number of items in the orig_list */ + atomic_t orig_list_count; + + /** @list_lock: lock protecting orig_list */ + spinlock_t list_lock; + + /** @roam_at: time at which TT_GLOBAL_ROAM was set */ + unsigned long roam_at; +}; + +/** + * struct batadv_tt_orig_list_entry - orig node announcing a non-mesh client + */ +struct batadv_tt_orig_list_entry { + /** @orig_node: pointer to orig node announcing this non-mesh client */ + struct batadv_orig_node *orig_node; + + /** + * @ttvn: translation table version number which added the non-mesh + * client + */ + u8 ttvn; + + /** @flags: per orig entry TT sync flags */ + u8 flags; + + /** @list: list node for &batadv_tt_global_entry.orig_list */ + struct hlist_node list; + + /** @refcount: number of contexts the object is used */ + struct kref refcount; + + /** @rcu: struct used for freeing in an RCU-safe manner */ + struct rcu_head rcu; +}; + +/** + * struct batadv_tt_change_node - structure for tt changes occurred + */ +struct batadv_tt_change_node { + /** @list: list node for &batadv_priv_tt.changes_list */ + struct list_head list; + + /** @change: holds the actual translation table diff data */ + struct batadv_tvlv_tt_change change; +}; + +/** + * struct batadv_tt_req_node - data to keep track of the tt requests in flight + */ +struct batadv_tt_req_node { + /** + * @addr: mac address of the originator this request was sent to + */ + u8 addr[ETH_ALEN]; + + /** @issued_at: timestamp used for purging stale tt requests */ + unsigned long issued_at; + + /** @refcount: number of contexts the object is used by */ + struct kref refcount; + + /** @list: list node for &batadv_priv_tt.req_list */ + struct hlist_node list; +}; + +/** + * struct batadv_tt_roam_node - roaming client data + */ +struct batadv_tt_roam_node { + /** @addr: mac address of the client in the roaming phase */ + u8 addr[ETH_ALEN]; + + /** + * @counter: number of allowed roaming events per client within a single + * OGM interval (changes are committed with each OGM) + */ + atomic_t counter; + + /** + * @first_time: timestamp used for purging stale roaming node entries + */ + unsigned long first_time; + + /** @list: list node for &batadv_priv_tt.roam_list */ + struct list_head list; +}; + +/** + * struct batadv_nc_node - network coding node + */ +struct batadv_nc_node { + /** @list: next and prev pointer for the list handling */ + struct list_head list; + + /** @addr: the node's mac address */ + u8 addr[ETH_ALEN]; + + /** @refcount: number of contexts the object is used by */ + struct kref refcount; + + /** @rcu: struct used for freeing in an RCU-safe manner */ + struct rcu_head rcu; + + /** @orig_node: pointer to corresponding orig node struct */ + struct batadv_orig_node *orig_node; + + /** @last_seen: timestamp of last ogm received from this node */ + unsigned long last_seen; +}; + +/** + * struct batadv_nc_path - network coding path + */ +struct batadv_nc_path { + /** @hash_entry: next and prev pointer for the list handling */ + struct hlist_node hash_entry; + + /** @rcu: struct used for freeing in an RCU-safe manner */ + struct rcu_head rcu; + + /** @refcount: number of contexts the object is used by */ + struct kref refcount; + + /** @packet_list: list of buffered packets for this path */ + struct list_head packet_list; + + /** @packet_list_lock: access lock for packet list */ + spinlock_t packet_list_lock; + + /** @next_hop: next hop (destination) of path */ + u8 next_hop[ETH_ALEN]; + + /** @prev_hop: previous hop (source) of path */ + u8 prev_hop[ETH_ALEN]; + + /** @last_valid: timestamp for last validation of path */ + unsigned long last_valid; +}; + +/** + * struct batadv_nc_packet - network coding packet used when coding and + * decoding packets + */ +struct batadv_nc_packet { + /** @list: next and prev pointer for the list handling */ + struct list_head list; + + /** @packet_id: crc32 checksum of skb data */ + __be32 packet_id; + + /** + * @timestamp: field containing the info when the packet was added to + * path + */ + unsigned long timestamp; + + /** @neigh_node: pointer to original next hop neighbor of skb */ + struct batadv_neigh_node *neigh_node; + + /** @skb: skb which can be encoded or used for decoding */ + struct sk_buff *skb; + + /** @nc_path: pointer to path this nc packet is attached to */ + struct batadv_nc_path *nc_path; +}; + +/** + * struct batadv_skb_cb - control buffer structure used to store private data + * relevant to batman-adv in the skb->cb buffer in skbs. + */ +struct batadv_skb_cb { + /** + * @decoded: Marks a skb as decoded, which is checked when searching for + * coding opportunities in network-coding.c + */ + unsigned char decoded:1; + + /** @num_bcasts: Counter for broadcast packet retransmissions */ + unsigned char num_bcasts; +}; + +/** + * struct batadv_forw_packet - structure for bcast packets to be sent/forwarded + */ +struct batadv_forw_packet { + /** + * @list: list node for &batadv_priv.forw.bcast_list and + * &batadv_priv.forw.bat_list + */ + struct hlist_node list; + + /** @cleanup_list: list node for purging functions */ + struct hlist_node cleanup_list; + + /** @send_time: execution time for delayed_work (packet sending) */ + unsigned long send_time; + + /** + * @own: bool for locally generated packets (local OGMs are re-scheduled + * after sending) + */ + u8 own; + + /** @skb: bcast packet's skb buffer */ + struct sk_buff *skb; + + /** @packet_len: size of aggregated OGM packet inside the skb buffer */ + u16 packet_len; + + /** @direct_link_flags: direct link flags for aggregated OGM packets */ + u32 direct_link_flags; + + /** @num_packets: counter for aggregated OGMv1 packets */ + u8 num_packets; + + /** @delayed_work: work queue callback item for packet sending */ + struct delayed_work delayed_work; + + /** + * @if_incoming: pointer to incoming hard-iface or primary iface if + * locally generated packet + */ + struct batadv_hard_iface *if_incoming; + + /** + * @if_outgoing: packet where the packet should be sent to, or NULL if + * unspecified + */ + struct batadv_hard_iface *if_outgoing; + + /** @queue_left: The queue (counter) this packet was applied to */ + atomic_t *queue_left; +}; + +/** + * struct batadv_algo_iface_ops - mesh algorithm callbacks (interface specific) + */ +struct batadv_algo_iface_ops { + /** + * @activate: start routing mechanisms when hard-interface is brought up + * (optional) + */ + void (*activate)(struct batadv_hard_iface *hard_iface); + + /** @enable: init routing info when hard-interface is enabled */ + int (*enable)(struct batadv_hard_iface *hard_iface); + + /** @enabled: notification when hard-interface was enabled (optional) */ + void (*enabled)(struct batadv_hard_iface *hard_iface); + + /** @disable: de-init routing info when hard-interface is disabled */ + void (*disable)(struct batadv_hard_iface *hard_iface); + + /** + * @update_mac: (re-)init mac addresses of the protocol information + * belonging to this hard-interface + */ + void (*update_mac)(struct batadv_hard_iface *hard_iface); + + /** @primary_set: called when primary interface is selected / changed */ + void (*primary_set)(struct batadv_hard_iface *hard_iface); +}; + +/** + * struct batadv_algo_neigh_ops - mesh algorithm callbacks (neighbour specific) + */ +struct batadv_algo_neigh_ops { + /** @hardif_init: called on creation of single hop entry (optional) */ + void (*hardif_init)(struct batadv_hardif_neigh_node *neigh); + + /** + * @cmp: compare the metrics of two neighbors for their respective + * outgoing interfaces + */ + int (*cmp)(struct batadv_neigh_node *neigh1, + struct batadv_hard_iface *if_outgoing1, + struct batadv_neigh_node *neigh2, + struct batadv_hard_iface *if_outgoing2); + + /** + * @is_similar_or_better: check if neigh1 is equally similar or better + * than neigh2 for their respective outgoing interface from the metric + * prospective + */ + bool (*is_similar_or_better)(struct batadv_neigh_node *neigh1, + struct batadv_hard_iface *if_outgoing1, + struct batadv_neigh_node *neigh2, + struct batadv_hard_iface *if_outgoing2); + + /** @dump: dump neighbors to a netlink socket (optional) */ + void (*dump)(struct sk_buff *msg, struct netlink_callback *cb, + struct batadv_priv *priv, + struct batadv_hard_iface *hard_iface); +}; + +/** + * struct batadv_algo_orig_ops - mesh algorithm callbacks (originator specific) + */ +struct batadv_algo_orig_ops { + /** @dump: dump originators to a netlink socket (optional) */ + void (*dump)(struct sk_buff *msg, struct netlink_callback *cb, + struct batadv_priv *priv, + struct batadv_hard_iface *hard_iface); +}; + +/** + * struct batadv_algo_gw_ops - mesh algorithm callbacks (GW specific) + */ +struct batadv_algo_gw_ops { + /** @init_sel_class: initialize GW selection class (optional) */ + void (*init_sel_class)(struct batadv_priv *bat_priv); + + /** + * @store_sel_class: parse and stores a new GW selection class + * (optional) + */ + ssize_t (*store_sel_class)(struct batadv_priv *bat_priv, char *buff, + size_t count); + /** + * @get_best_gw_node: select the best GW from the list of available + * nodes (optional) + */ + struct batadv_gw_node *(*get_best_gw_node) + (struct batadv_priv *bat_priv); + + /** + * @is_eligible: check if a newly discovered GW is a potential candidate + * for the election as best GW (optional) + */ + bool (*is_eligible)(struct batadv_priv *bat_priv, + struct batadv_orig_node *curr_gw_orig, + struct batadv_orig_node *orig_node); + + /** @dump: dump gateways to a netlink socket (optional) */ + void (*dump)(struct sk_buff *msg, struct netlink_callback *cb, + struct batadv_priv *priv); +}; + +/** + * struct batadv_algo_ops - mesh algorithm callbacks + */ +struct batadv_algo_ops { + /** @list: list node for the batadv_algo_list */ + struct hlist_node list; + + /** @name: name of the algorithm */ + char *name; + + /** @iface: callbacks related to interface handling */ + struct batadv_algo_iface_ops iface; + + /** @neigh: callbacks related to neighbors handling */ + struct batadv_algo_neigh_ops neigh; + + /** @orig: callbacks related to originators handling */ + struct batadv_algo_orig_ops orig; + + /** @gw: callbacks related to GW mode */ + struct batadv_algo_gw_ops gw; +}; + +/** + * struct batadv_dat_entry - it is a single entry of batman-adv ARP backend. It + * is used to stored ARP entries needed for the global DAT cache + */ +struct batadv_dat_entry { + /** @ip: the IPv4 corresponding to this DAT/ARP entry */ + __be32 ip; + + /** @mac_addr: the MAC address associated to the stored IPv4 */ + u8 mac_addr[ETH_ALEN]; + + /** @vid: the vlan ID associated to this entry */ + unsigned short vid; + + /** + * @last_update: time in jiffies when this entry was refreshed last time + */ + unsigned long last_update; + + /** @hash_entry: hlist node for &batadv_priv_dat.hash */ + struct hlist_node hash_entry; + + /** @refcount: number of contexts the object is used */ + struct kref refcount; + + /** @rcu: struct used for freeing in an RCU-safe manner */ + struct rcu_head rcu; +}; + +/** + * struct batadv_hw_addr - a list entry for a MAC address + */ +struct batadv_hw_addr { + /** @list: list node for the linking of entries */ + struct hlist_node list; + + /** @addr: the MAC address of this list entry */ + unsigned char addr[ETH_ALEN]; +}; + +/** + * struct batadv_dat_candidate - candidate destination for DAT operations + */ +struct batadv_dat_candidate { + /** + * @type: the type of the selected candidate. It can one of the + * following: + * - BATADV_DAT_CANDIDATE_NOT_FOUND + * - BATADV_DAT_CANDIDATE_ORIG + */ + int type; + + /** + * @orig_node: if type is BATADV_DAT_CANDIDATE_ORIG this field points to + * the corresponding originator node structure + */ + struct batadv_orig_node *orig_node; +}; + +/** + * struct batadv_tvlv_container - container for tvlv appended to OGMs + */ +struct batadv_tvlv_container { + /** @list: hlist node for &batadv_priv_tvlv.container_list */ + struct hlist_node list; + + /** @tvlv_hdr: tvlv header information needed to construct the tvlv */ + struct batadv_tvlv_hdr tvlv_hdr; + + /** @refcount: number of contexts the object is used */ + struct kref refcount; +}; + +/** + * struct batadv_tvlv_handler - handler for specific tvlv type and version + */ +struct batadv_tvlv_handler { + /** @list: hlist node for &batadv_priv_tvlv.handler_list */ + struct hlist_node list; + + /** + * @ogm_handler: handler callback which is given the tvlv payload to + * process on incoming OGM packets + */ + void (*ogm_handler)(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig, + u8 flags, void *tvlv_value, u16 tvlv_value_len); + + /** + * @unicast_handler: handler callback which is given the tvlv payload to + * process on incoming unicast tvlv packets + */ + int (*unicast_handler)(struct batadv_priv *bat_priv, + u8 *src, u8 *dst, + void *tvlv_value, u16 tvlv_value_len); + + /** @type: tvlv type this handler feels responsible for */ + u8 type; + + /** @version: tvlv version this handler feels responsible for */ + u8 version; + + /** @flags: tvlv handler flags */ + u8 flags; + + /** @refcount: number of contexts the object is used */ + struct kref refcount; + + /** @rcu: struct used for freeing in an RCU-safe manner */ + struct rcu_head rcu; +}; + +/** + * enum batadv_tvlv_handler_flags - tvlv handler flags definitions + */ +enum batadv_tvlv_handler_flags { + /** + * @BATADV_TVLV_HANDLER_OGM_CIFNOTFND: tvlv ogm processing function + * will call this handler even if its type was not found (with no data) + */ + BATADV_TVLV_HANDLER_OGM_CIFNOTFND = BIT(1), + + /** + * @BATADV_TVLV_HANDLER_OGM_CALLED: interval tvlv handling flag - the + * API marks a handler as being called, so it won't be called if the + * BATADV_TVLV_HANDLER_OGM_CIFNOTFND flag was set + */ + BATADV_TVLV_HANDLER_OGM_CALLED = BIT(2), +}; + +#endif /* _NET_BATMAN_ADV_TYPES_H_ */ |