diff options
Diffstat (limited to '')
| -rw-r--r-- | net/batman-adv/translation-table.c | 4290 |
1 files changed, 4290 insertions, 0 deletions
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); +} |