diff options
Diffstat (limited to 'net/batman-adv/originator.c')
| -rw-r--r-- | net/batman-adv/originator.c | 1349 |
1 files changed, 1349 insertions, 0 deletions
diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c new file mode 100644 index 000000000..34903df4f --- /dev/null +++ b/net/batman-adv/originator.c @@ -0,0 +1,1349 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + */ + +#include "originator.h" +#include "main.h" + +#include <linux/atomic.h> +#include <linux/container_of.h> +#include <linux/errno.h> +#include <linux/etherdevice.h> +#include <linux/gfp.h> +#include <linux/jiffies.h> +#include <linux/kref.h> +#include <linux/list.h> +#include <linux/lockdep.h> +#include <linux/netdevice.h> +#include <linux/netlink.h> +#include <linux/rculist.h> +#include <linux/rcupdate.h> +#include <linux/skbuff.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/stddef.h> +#include <linux/workqueue.h> +#include <net/sock.h> +#include <uapi/linux/batadv_packet.h> +#include <uapi/linux/batman_adv.h> + +#include "bat_algo.h" +#include "distributed-arp-table.h" +#include "fragmentation.h" +#include "gateway_client.h" +#include "hard-interface.h" +#include "hash.h" +#include "log.h" +#include "multicast.h" +#include "netlink.h" +#include "network-coding.h" +#include "routing.h" +#include "soft-interface.h" +#include "translation-table.h" + +/* hash class keys */ +static struct lock_class_key batadv_orig_hash_lock_class_key; + +/** + * batadv_orig_hash_find() - Find and return originator from orig_hash + * @bat_priv: the bat priv with all the soft interface information + * @data: mac address of the originator + * + * Return: orig_node (with increased refcnt), NULL on errors + */ +struct batadv_orig_node * +batadv_orig_hash_find(struct batadv_priv *bat_priv, const void *data) +{ + struct batadv_hashtable *hash = bat_priv->orig_hash; + struct hlist_head *head; + struct batadv_orig_node *orig_node, *orig_node_tmp = NULL; + int index; + + if (!hash) + return NULL; + + index = batadv_choose_orig(data, hash->size); + head = &hash->table[index]; + + rcu_read_lock(); + hlist_for_each_entry_rcu(orig_node, head, hash_entry) { + if (!batadv_compare_eth(orig_node, data)) + continue; + + if (!kref_get_unless_zero(&orig_node->refcount)) + continue; + + orig_node_tmp = orig_node; + break; + } + rcu_read_unlock(); + + return orig_node_tmp; +} + +static void batadv_purge_orig(struct work_struct *work); + +/** + * batadv_compare_orig() - comparing function used in the originator hash table + * @node: node in the local table + * @data2: second object to compare the node to + * + * Return: true if they are the same originator + */ +bool batadv_compare_orig(const struct hlist_node *node, const void *data2) +{ + const void *data1 = container_of(node, struct batadv_orig_node, + hash_entry); + + return batadv_compare_eth(data1, data2); +} + +/** + * batadv_orig_node_vlan_get() - get an orig_node_vlan object + * @orig_node: the originator serving the VLAN + * @vid: the VLAN identifier + * + * Return: the vlan object identified by vid and belonging to orig_node or NULL + * if it does not exist. + */ +struct batadv_orig_node_vlan * +batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node, + unsigned short vid) +{ + struct batadv_orig_node_vlan *vlan = NULL, *tmp; + + rcu_read_lock(); + hlist_for_each_entry_rcu(tmp, &orig_node->vlan_list, list) { + if (tmp->vid != vid) + continue; + + if (!kref_get_unless_zero(&tmp->refcount)) + continue; + + vlan = tmp; + + break; + } + rcu_read_unlock(); + + return vlan; +} + +/** + * batadv_orig_node_vlan_new() - search and possibly create an orig_node_vlan + * object + * @orig_node: the originator serving the VLAN + * @vid: the VLAN identifier + * + * Return: NULL in case of failure or the vlan object identified by vid and + * belonging to orig_node otherwise. The object is created and added to the list + * if it does not exist. + * + * The object is returned with refcounter increased by 1. + */ +struct batadv_orig_node_vlan * +batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node, + unsigned short vid) +{ + struct batadv_orig_node_vlan *vlan; + + spin_lock_bh(&orig_node->vlan_list_lock); + + /* first look if an object for this vid already exists */ + vlan = batadv_orig_node_vlan_get(orig_node, vid); + if (vlan) + goto out; + + vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC); + if (!vlan) + goto out; + + kref_init(&vlan->refcount); + vlan->vid = vid; + + kref_get(&vlan->refcount); + hlist_add_head_rcu(&vlan->list, &orig_node->vlan_list); + +out: + spin_unlock_bh(&orig_node->vlan_list_lock); + + return vlan; +} + +/** + * batadv_orig_node_vlan_release() - release originator-vlan object from lists + * and queue for free after rcu grace period + * @ref: kref pointer of the originator-vlan object + */ +void batadv_orig_node_vlan_release(struct kref *ref) +{ + struct batadv_orig_node_vlan *orig_vlan; + + orig_vlan = container_of(ref, struct batadv_orig_node_vlan, refcount); + + kfree_rcu(orig_vlan, rcu); +} + +/** + * batadv_originator_init() - Initialize all originator structures + * @bat_priv: the bat priv with all the soft interface information + * + * Return: 0 on success or negative error number in case of failure + */ +int batadv_originator_init(struct batadv_priv *bat_priv) +{ + if (bat_priv->orig_hash) + return 0; + + bat_priv->orig_hash = batadv_hash_new(1024); + + if (!bat_priv->orig_hash) + goto err; + + batadv_hash_set_lock_class(bat_priv->orig_hash, + &batadv_orig_hash_lock_class_key); + + INIT_DELAYED_WORK(&bat_priv->orig_work, batadv_purge_orig); + queue_delayed_work(batadv_event_workqueue, + &bat_priv->orig_work, + msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD)); + + return 0; + +err: + return -ENOMEM; +} + +/** + * batadv_neigh_ifinfo_release() - release neigh_ifinfo from lists and queue for + * free after rcu grace period + * @ref: kref pointer of the neigh_ifinfo + */ +void batadv_neigh_ifinfo_release(struct kref *ref) +{ + struct batadv_neigh_ifinfo *neigh_ifinfo; + + neigh_ifinfo = container_of(ref, struct batadv_neigh_ifinfo, refcount); + + if (neigh_ifinfo->if_outgoing != BATADV_IF_DEFAULT) + batadv_hardif_put(neigh_ifinfo->if_outgoing); + + kfree_rcu(neigh_ifinfo, rcu); +} + +/** + * batadv_hardif_neigh_release() - release hardif neigh node from lists and + * queue for free after rcu grace period + * @ref: kref pointer of the neigh_node + */ +void batadv_hardif_neigh_release(struct kref *ref) +{ + struct batadv_hardif_neigh_node *hardif_neigh; + + hardif_neigh = container_of(ref, struct batadv_hardif_neigh_node, + refcount); + + spin_lock_bh(&hardif_neigh->if_incoming->neigh_list_lock); + hlist_del_init_rcu(&hardif_neigh->list); + spin_unlock_bh(&hardif_neigh->if_incoming->neigh_list_lock); + + batadv_hardif_put(hardif_neigh->if_incoming); + kfree_rcu(hardif_neigh, rcu); +} + +/** + * batadv_neigh_node_release() - release neigh_node from lists and queue for + * free after rcu grace period + * @ref: kref pointer of the neigh_node + */ +void batadv_neigh_node_release(struct kref *ref) +{ + struct hlist_node *node_tmp; + struct batadv_neigh_node *neigh_node; + struct batadv_neigh_ifinfo *neigh_ifinfo; + + neigh_node = container_of(ref, struct batadv_neigh_node, refcount); + + hlist_for_each_entry_safe(neigh_ifinfo, node_tmp, + &neigh_node->ifinfo_list, list) { + batadv_neigh_ifinfo_put(neigh_ifinfo); + } + + batadv_hardif_neigh_put(neigh_node->hardif_neigh); + + batadv_hardif_put(neigh_node->if_incoming); + + kfree_rcu(neigh_node, rcu); +} + +/** + * batadv_orig_router_get() - router to the originator depending on iface + * @orig_node: the orig node for the router + * @if_outgoing: the interface where the payload packet has been received or + * the OGM should be sent to + * + * Return: the neighbor which should be the router for this orig_node/iface. + * + * The object is returned with refcounter increased by 1. + */ +struct batadv_neigh_node * +batadv_orig_router_get(struct batadv_orig_node *orig_node, + const struct batadv_hard_iface *if_outgoing) +{ + struct batadv_orig_ifinfo *orig_ifinfo; + struct batadv_neigh_node *router = NULL; + + rcu_read_lock(); + hlist_for_each_entry_rcu(orig_ifinfo, &orig_node->ifinfo_list, list) { + if (orig_ifinfo->if_outgoing != if_outgoing) + continue; + + router = rcu_dereference(orig_ifinfo->router); + break; + } + + if (router && !kref_get_unless_zero(&router->refcount)) + router = NULL; + + rcu_read_unlock(); + return router; +} + +/** + * batadv_orig_ifinfo_get() - find the ifinfo from an orig_node + * @orig_node: the orig node to be queried + * @if_outgoing: the interface for which the ifinfo should be acquired + * + * Return: the requested orig_ifinfo or NULL if not found. + * + * The object is returned with refcounter increased by 1. + */ +struct batadv_orig_ifinfo * +batadv_orig_ifinfo_get(struct batadv_orig_node *orig_node, + struct batadv_hard_iface *if_outgoing) +{ + struct batadv_orig_ifinfo *tmp, *orig_ifinfo = NULL; + + rcu_read_lock(); + hlist_for_each_entry_rcu(tmp, &orig_node->ifinfo_list, + list) { + if (tmp->if_outgoing != if_outgoing) + continue; + + if (!kref_get_unless_zero(&tmp->refcount)) + continue; + + orig_ifinfo = tmp; + break; + } + rcu_read_unlock(); + + return orig_ifinfo; +} + +/** + * batadv_orig_ifinfo_new() - search and possibly create an orig_ifinfo object + * @orig_node: the orig node to be queried + * @if_outgoing: the interface for which the ifinfo should be acquired + * + * Return: NULL in case of failure or the orig_ifinfo object for the if_outgoing + * interface otherwise. The object is created and added to the list + * if it does not exist. + * + * The object is returned with refcounter increased by 1. + */ +struct batadv_orig_ifinfo * +batadv_orig_ifinfo_new(struct batadv_orig_node *orig_node, + struct batadv_hard_iface *if_outgoing) +{ + struct batadv_orig_ifinfo *orig_ifinfo; + unsigned long reset_time; + + spin_lock_bh(&orig_node->neigh_list_lock); + + orig_ifinfo = batadv_orig_ifinfo_get(orig_node, if_outgoing); + if (orig_ifinfo) + goto out; + + orig_ifinfo = kzalloc(sizeof(*orig_ifinfo), GFP_ATOMIC); + if (!orig_ifinfo) + goto out; + + if (if_outgoing != BATADV_IF_DEFAULT) + kref_get(&if_outgoing->refcount); + + reset_time = jiffies - 1; + reset_time -= msecs_to_jiffies(BATADV_RESET_PROTECTION_MS); + orig_ifinfo->batman_seqno_reset = reset_time; + orig_ifinfo->if_outgoing = if_outgoing; + INIT_HLIST_NODE(&orig_ifinfo->list); + kref_init(&orig_ifinfo->refcount); + + kref_get(&orig_ifinfo->refcount); + hlist_add_head_rcu(&orig_ifinfo->list, + &orig_node->ifinfo_list); +out: + spin_unlock_bh(&orig_node->neigh_list_lock); + return orig_ifinfo; +} + +/** + * batadv_neigh_ifinfo_get() - find the ifinfo from an neigh_node + * @neigh: the neigh node to be queried + * @if_outgoing: the interface for which the ifinfo should be acquired + * + * The object is returned with refcounter increased by 1. + * + * Return: the requested neigh_ifinfo or NULL if not found + */ +struct batadv_neigh_ifinfo * +batadv_neigh_ifinfo_get(struct batadv_neigh_node *neigh, + struct batadv_hard_iface *if_outgoing) +{ + struct batadv_neigh_ifinfo *neigh_ifinfo = NULL, + *tmp_neigh_ifinfo; + + rcu_read_lock(); + hlist_for_each_entry_rcu(tmp_neigh_ifinfo, &neigh->ifinfo_list, + list) { + if (tmp_neigh_ifinfo->if_outgoing != if_outgoing) + continue; + + if (!kref_get_unless_zero(&tmp_neigh_ifinfo->refcount)) + continue; + + neigh_ifinfo = tmp_neigh_ifinfo; + break; + } + rcu_read_unlock(); + + return neigh_ifinfo; +} + +/** + * batadv_neigh_ifinfo_new() - search and possibly create an neigh_ifinfo object + * @neigh: the neigh node to be queried + * @if_outgoing: the interface for which the ifinfo should be acquired + * + * Return: NULL in case of failure or the neigh_ifinfo object for the + * if_outgoing interface otherwise. The object is created and added to the list + * if it does not exist. + * + * The object is returned with refcounter increased by 1. + */ +struct batadv_neigh_ifinfo * +batadv_neigh_ifinfo_new(struct batadv_neigh_node *neigh, + struct batadv_hard_iface *if_outgoing) +{ + struct batadv_neigh_ifinfo *neigh_ifinfo; + + spin_lock_bh(&neigh->ifinfo_lock); + + neigh_ifinfo = batadv_neigh_ifinfo_get(neigh, if_outgoing); + if (neigh_ifinfo) + goto out; + + neigh_ifinfo = kzalloc(sizeof(*neigh_ifinfo), GFP_ATOMIC); + if (!neigh_ifinfo) + goto out; + + if (if_outgoing) + kref_get(&if_outgoing->refcount); + + INIT_HLIST_NODE(&neigh_ifinfo->list); + kref_init(&neigh_ifinfo->refcount); + neigh_ifinfo->if_outgoing = if_outgoing; + + kref_get(&neigh_ifinfo->refcount); + hlist_add_head_rcu(&neigh_ifinfo->list, &neigh->ifinfo_list); + +out: + spin_unlock_bh(&neigh->ifinfo_lock); + + return neigh_ifinfo; +} + +/** + * batadv_neigh_node_get() - retrieve a neighbour from the list + * @orig_node: originator which the neighbour belongs to + * @hard_iface: the interface where this neighbour is connected to + * @addr: the address of the neighbour + * + * Looks for and possibly returns a neighbour belonging to this originator list + * which is connected through the provided hard interface. + * + * Return: neighbor when found. Otherwise NULL + */ +static struct batadv_neigh_node * +batadv_neigh_node_get(const struct batadv_orig_node *orig_node, + const struct batadv_hard_iface *hard_iface, + const u8 *addr) +{ + struct batadv_neigh_node *tmp_neigh_node, *res = NULL; + + rcu_read_lock(); + hlist_for_each_entry_rcu(tmp_neigh_node, &orig_node->neigh_list, list) { + if (!batadv_compare_eth(tmp_neigh_node->addr, addr)) + continue; + + if (tmp_neigh_node->if_incoming != hard_iface) + continue; + + if (!kref_get_unless_zero(&tmp_neigh_node->refcount)) + continue; + + res = tmp_neigh_node; + break; + } + rcu_read_unlock(); + + return res; +} + +/** + * batadv_hardif_neigh_create() - create a hardif neighbour node + * @hard_iface: the interface this neighbour is connected to + * @neigh_addr: the interface address of the neighbour to retrieve + * @orig_node: originator object representing the neighbour + * + * Return: the hardif neighbour node if found or created or NULL otherwise. + */ +static struct batadv_hardif_neigh_node * +batadv_hardif_neigh_create(struct batadv_hard_iface *hard_iface, + const u8 *neigh_addr, + struct batadv_orig_node *orig_node) +{ + struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); + struct batadv_hardif_neigh_node *hardif_neigh; + + spin_lock_bh(&hard_iface->neigh_list_lock); + + /* check if neighbor hasn't been added in the meantime */ + hardif_neigh = batadv_hardif_neigh_get(hard_iface, neigh_addr); + if (hardif_neigh) + goto out; + + hardif_neigh = kzalloc(sizeof(*hardif_neigh), GFP_ATOMIC); + if (!hardif_neigh) + goto out; + + kref_get(&hard_iface->refcount); + INIT_HLIST_NODE(&hardif_neigh->list); + ether_addr_copy(hardif_neigh->addr, neigh_addr); + ether_addr_copy(hardif_neigh->orig, orig_node->orig); + hardif_neigh->if_incoming = hard_iface; + hardif_neigh->last_seen = jiffies; + + kref_init(&hardif_neigh->refcount); + + if (bat_priv->algo_ops->neigh.hardif_init) + bat_priv->algo_ops->neigh.hardif_init(hardif_neigh); + + hlist_add_head_rcu(&hardif_neigh->list, &hard_iface->neigh_list); + +out: + spin_unlock_bh(&hard_iface->neigh_list_lock); + return hardif_neigh; +} + +/** + * batadv_hardif_neigh_get_or_create() - retrieve or create a hardif neighbour + * node + * @hard_iface: the interface this neighbour is connected to + * @neigh_addr: the interface address of the neighbour to retrieve + * @orig_node: originator object representing the neighbour + * + * Return: the hardif neighbour node if found or created or NULL otherwise. + */ +static struct batadv_hardif_neigh_node * +batadv_hardif_neigh_get_or_create(struct batadv_hard_iface *hard_iface, + const u8 *neigh_addr, + struct batadv_orig_node *orig_node) +{ + struct batadv_hardif_neigh_node *hardif_neigh; + + /* first check without locking to avoid the overhead */ + hardif_neigh = batadv_hardif_neigh_get(hard_iface, neigh_addr); + if (hardif_neigh) + return hardif_neigh; + + return batadv_hardif_neigh_create(hard_iface, neigh_addr, orig_node); +} + +/** + * batadv_hardif_neigh_get() - retrieve a hardif neighbour from the list + * @hard_iface: the interface where this neighbour is connected to + * @neigh_addr: the address of the neighbour + * + * Looks for and possibly returns a neighbour belonging to this hard interface. + * + * Return: neighbor when found. Otherwise NULL + */ +struct batadv_hardif_neigh_node * +batadv_hardif_neigh_get(const struct batadv_hard_iface *hard_iface, + const u8 *neigh_addr) +{ + struct batadv_hardif_neigh_node *tmp_hardif_neigh, *hardif_neigh = NULL; + + rcu_read_lock(); + hlist_for_each_entry_rcu(tmp_hardif_neigh, + &hard_iface->neigh_list, list) { + if (!batadv_compare_eth(tmp_hardif_neigh->addr, neigh_addr)) + continue; + + if (!kref_get_unless_zero(&tmp_hardif_neigh->refcount)) + continue; + + hardif_neigh = tmp_hardif_neigh; + break; + } + rcu_read_unlock(); + + return hardif_neigh; +} + +/** + * batadv_neigh_node_create() - create a neigh node object + * @orig_node: originator object representing the neighbour + * @hard_iface: the interface where the neighbour is connected to + * @neigh_addr: the mac address of the neighbour interface + * + * Allocates a new neigh_node object and initialises all the generic fields. + * + * Return: the neighbour node if found or created or NULL otherwise. + */ +static struct batadv_neigh_node * +batadv_neigh_node_create(struct batadv_orig_node *orig_node, + struct batadv_hard_iface *hard_iface, + const u8 *neigh_addr) +{ + struct batadv_neigh_node *neigh_node; + struct batadv_hardif_neigh_node *hardif_neigh = NULL; + + spin_lock_bh(&orig_node->neigh_list_lock); + + neigh_node = batadv_neigh_node_get(orig_node, hard_iface, neigh_addr); + if (neigh_node) + goto out; + + hardif_neigh = batadv_hardif_neigh_get_or_create(hard_iface, + neigh_addr, orig_node); + if (!hardif_neigh) + goto out; + + neigh_node = kzalloc(sizeof(*neigh_node), GFP_ATOMIC); + if (!neigh_node) + goto out; + + INIT_HLIST_NODE(&neigh_node->list); + INIT_HLIST_HEAD(&neigh_node->ifinfo_list); + spin_lock_init(&neigh_node->ifinfo_lock); + + kref_get(&hard_iface->refcount); + ether_addr_copy(neigh_node->addr, neigh_addr); + neigh_node->if_incoming = hard_iface; + neigh_node->orig_node = orig_node; + neigh_node->last_seen = jiffies; + + /* increment unique neighbor refcount */ + kref_get(&hardif_neigh->refcount); + neigh_node->hardif_neigh = hardif_neigh; + + /* extra reference for return */ + kref_init(&neigh_node->refcount); + + kref_get(&neigh_node->refcount); + hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list); + + batadv_dbg(BATADV_DBG_BATMAN, orig_node->bat_priv, + "Creating new neighbor %pM for orig_node %pM on interface %s\n", + neigh_addr, orig_node->orig, hard_iface->net_dev->name); + +out: + spin_unlock_bh(&orig_node->neigh_list_lock); + + batadv_hardif_neigh_put(hardif_neigh); + return neigh_node; +} + +/** + * batadv_neigh_node_get_or_create() - retrieve or create a neigh node object + * @orig_node: originator object representing the neighbour + * @hard_iface: the interface where the neighbour is connected to + * @neigh_addr: the mac address of the neighbour interface + * + * Return: the neighbour node if found or created or NULL otherwise. + */ +struct batadv_neigh_node * +batadv_neigh_node_get_or_create(struct batadv_orig_node *orig_node, + struct batadv_hard_iface *hard_iface, + const u8 *neigh_addr) +{ + struct batadv_neigh_node *neigh_node; + + /* first check without locking to avoid the overhead */ + neigh_node = batadv_neigh_node_get(orig_node, hard_iface, neigh_addr); + if (neigh_node) + return neigh_node; + + return batadv_neigh_node_create(orig_node, hard_iface, neigh_addr); +} + +/** + * batadv_hardif_neigh_dump() - Dump to netlink the neighbor infos for a + * specific outgoing interface + * @msg: message to dump into + * @cb: parameters for the dump + * + * Return: 0 or error value + */ +int batadv_hardif_neigh_dump(struct sk_buff *msg, struct netlink_callback *cb) +{ + struct net *net = sock_net(cb->skb->sk); + struct net_device *soft_iface; + struct net_device *hard_iface = NULL; + struct batadv_hard_iface *hardif = BATADV_IF_DEFAULT; + struct batadv_priv *bat_priv; + struct batadv_hard_iface *primary_if = NULL; + int ret; + int ifindex, hard_ifindex; + + ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX); + if (!ifindex) + return -EINVAL; + + soft_iface = dev_get_by_index(net, ifindex); + if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { + ret = -ENODEV; + goto out; + } + + bat_priv = netdev_priv(soft_iface); + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { + ret = -ENOENT; + goto out; + } + + hard_ifindex = batadv_netlink_get_ifindex(cb->nlh, + BATADV_ATTR_HARD_IFINDEX); + if (hard_ifindex) { + hard_iface = dev_get_by_index(net, hard_ifindex); + if (hard_iface) + hardif = batadv_hardif_get_by_netdev(hard_iface); + + if (!hardif) { + ret = -ENODEV; + goto out; + } + + if (hardif->soft_iface != soft_iface) { + ret = -ENOENT; + goto out; + } + } + + if (!bat_priv->algo_ops->neigh.dump) { + ret = -EOPNOTSUPP; + goto out; + } + + bat_priv->algo_ops->neigh.dump(msg, cb, bat_priv, hardif); + + ret = msg->len; + + out: + batadv_hardif_put(hardif); + dev_put(hard_iface); + batadv_hardif_put(primary_if); + dev_put(soft_iface); + + return ret; +} + +/** + * batadv_orig_ifinfo_release() - release orig_ifinfo from lists and queue for + * free after rcu grace period + * @ref: kref pointer of the orig_ifinfo + */ +void batadv_orig_ifinfo_release(struct kref *ref) +{ + struct batadv_orig_ifinfo *orig_ifinfo; + struct batadv_neigh_node *router; + + orig_ifinfo = container_of(ref, struct batadv_orig_ifinfo, refcount); + + if (orig_ifinfo->if_outgoing != BATADV_IF_DEFAULT) + batadv_hardif_put(orig_ifinfo->if_outgoing); + + /* this is the last reference to this object */ + router = rcu_dereference_protected(orig_ifinfo->router, true); + batadv_neigh_node_put(router); + + kfree_rcu(orig_ifinfo, rcu); +} + +/** + * batadv_orig_node_free_rcu() - free the orig_node + * @rcu: rcu pointer of the orig_node + */ +static void batadv_orig_node_free_rcu(struct rcu_head *rcu) +{ + struct batadv_orig_node *orig_node; + + orig_node = container_of(rcu, struct batadv_orig_node, rcu); + + batadv_mcast_purge_orig(orig_node); + + batadv_frag_purge_orig(orig_node, NULL); + + kfree(orig_node->tt_buff); + kfree(orig_node); +} + +/** + * batadv_orig_node_release() - release orig_node from lists and queue for + * free after rcu grace period + * @ref: kref pointer of the orig_node + */ +void batadv_orig_node_release(struct kref *ref) +{ + struct hlist_node *node_tmp; + struct batadv_neigh_node *neigh_node; + struct batadv_orig_node *orig_node; + struct batadv_orig_ifinfo *orig_ifinfo; + struct batadv_orig_node_vlan *vlan; + struct batadv_orig_ifinfo *last_candidate; + + orig_node = container_of(ref, struct batadv_orig_node, refcount); + + spin_lock_bh(&orig_node->neigh_list_lock); + + /* for all neighbors towards this originator ... */ + hlist_for_each_entry_safe(neigh_node, node_tmp, + &orig_node->neigh_list, list) { + hlist_del_rcu(&neigh_node->list); + batadv_neigh_node_put(neigh_node); + } + + hlist_for_each_entry_safe(orig_ifinfo, node_tmp, + &orig_node->ifinfo_list, list) { + hlist_del_rcu(&orig_ifinfo->list); + batadv_orig_ifinfo_put(orig_ifinfo); + } + + last_candidate = orig_node->last_bonding_candidate; + orig_node->last_bonding_candidate = NULL; + spin_unlock_bh(&orig_node->neigh_list_lock); + + batadv_orig_ifinfo_put(last_candidate); + + spin_lock_bh(&orig_node->vlan_list_lock); + hlist_for_each_entry_safe(vlan, node_tmp, &orig_node->vlan_list, list) { + hlist_del_rcu(&vlan->list); + batadv_orig_node_vlan_put(vlan); + } + spin_unlock_bh(&orig_node->vlan_list_lock); + + /* Free nc_nodes */ + batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL); + + call_rcu(&orig_node->rcu, batadv_orig_node_free_rcu); +} + +/** + * batadv_originator_free() - Free all originator structures + * @bat_priv: the bat priv with all the soft interface information + */ +void batadv_originator_free(struct batadv_priv *bat_priv) +{ + struct batadv_hashtable *hash = bat_priv->orig_hash; + struct hlist_node *node_tmp; + struct hlist_head *head; + spinlock_t *list_lock; /* spinlock to protect write access */ + struct batadv_orig_node *orig_node; + u32 i; + + if (!hash) + return; + + cancel_delayed_work_sync(&bat_priv->orig_work); + + bat_priv->orig_hash = NULL; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + list_lock = &hash->list_locks[i]; + + spin_lock_bh(list_lock); + hlist_for_each_entry_safe(orig_node, node_tmp, + head, hash_entry) { + hlist_del_rcu(&orig_node->hash_entry); + batadv_orig_node_put(orig_node); + } + spin_unlock_bh(list_lock); + } + + batadv_hash_destroy(hash); +} + +/** + * batadv_orig_node_new() - creates a new orig_node + * @bat_priv: the bat priv with all the soft interface information + * @addr: the mac address of the originator + * + * Creates a new originator object and initialises all the generic fields. + * The new object is not added to the originator list. + * + * Return: the newly created object or NULL on failure. + */ +struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv, + const u8 *addr) +{ + struct batadv_orig_node *orig_node; + struct batadv_orig_node_vlan *vlan; + unsigned long reset_time; + int i; + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Creating new originator: %pM\n", addr); + + orig_node = kzalloc(sizeof(*orig_node), GFP_ATOMIC); + if (!orig_node) + return NULL; + + INIT_HLIST_HEAD(&orig_node->neigh_list); + INIT_HLIST_HEAD(&orig_node->vlan_list); + INIT_HLIST_HEAD(&orig_node->ifinfo_list); + spin_lock_init(&orig_node->bcast_seqno_lock); + spin_lock_init(&orig_node->neigh_list_lock); + spin_lock_init(&orig_node->tt_buff_lock); + spin_lock_init(&orig_node->tt_lock); + spin_lock_init(&orig_node->vlan_list_lock); + + batadv_nc_init_orig(orig_node); + + /* extra reference for return */ + kref_init(&orig_node->refcount); + + orig_node->bat_priv = bat_priv; + ether_addr_copy(orig_node->orig, addr); + batadv_dat_init_orig_node_addr(orig_node); + atomic_set(&orig_node->last_ttvn, 0); + orig_node->tt_buff = NULL; + orig_node->tt_buff_len = 0; + orig_node->last_seen = jiffies; + reset_time = jiffies - 1 - msecs_to_jiffies(BATADV_RESET_PROTECTION_MS); + orig_node->bcast_seqno_reset = reset_time; + +#ifdef CONFIG_BATMAN_ADV_MCAST + orig_node->mcast_flags = BATADV_MCAST_WANT_NO_RTR4; + orig_node->mcast_flags |= BATADV_MCAST_WANT_NO_RTR6; + INIT_HLIST_NODE(&orig_node->mcast_want_all_unsnoopables_node); + INIT_HLIST_NODE(&orig_node->mcast_want_all_ipv4_node); + INIT_HLIST_NODE(&orig_node->mcast_want_all_ipv6_node); + spin_lock_init(&orig_node->mcast_handler_lock); +#endif + + /* create a vlan object for the "untagged" LAN */ + vlan = batadv_orig_node_vlan_new(orig_node, BATADV_NO_FLAGS); + if (!vlan) + goto free_orig_node; + /* batadv_orig_node_vlan_new() increases the refcounter. + * Immediately release vlan since it is not needed anymore in this + * context + */ + batadv_orig_node_vlan_put(vlan); + + for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) { + INIT_HLIST_HEAD(&orig_node->fragments[i].fragment_list); + spin_lock_init(&orig_node->fragments[i].lock); + orig_node->fragments[i].size = 0; + } + + return orig_node; +free_orig_node: + kfree(orig_node); + return NULL; +} + +/** + * batadv_purge_neigh_ifinfo() - purge obsolete ifinfo entries from neighbor + * @bat_priv: the bat priv with all the soft interface information + * @neigh: orig node which is to be checked + */ +static void +batadv_purge_neigh_ifinfo(struct batadv_priv *bat_priv, + struct batadv_neigh_node *neigh) +{ + struct batadv_neigh_ifinfo *neigh_ifinfo; + struct batadv_hard_iface *if_outgoing; + struct hlist_node *node_tmp; + + spin_lock_bh(&neigh->ifinfo_lock); + + /* for all ifinfo objects for this neighinator */ + hlist_for_each_entry_safe(neigh_ifinfo, node_tmp, + &neigh->ifinfo_list, list) { + if_outgoing = neigh_ifinfo->if_outgoing; + + /* always keep the default interface */ + if (if_outgoing == BATADV_IF_DEFAULT) + continue; + + /* don't purge if the interface is not (going) down */ + if (if_outgoing->if_status != BATADV_IF_INACTIVE && + if_outgoing->if_status != BATADV_IF_NOT_IN_USE && + if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED) + continue; + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "neighbor/ifinfo purge: neighbor %pM, iface: %s\n", + neigh->addr, if_outgoing->net_dev->name); + + hlist_del_rcu(&neigh_ifinfo->list); + batadv_neigh_ifinfo_put(neigh_ifinfo); + } + + spin_unlock_bh(&neigh->ifinfo_lock); +} + +/** + * batadv_purge_orig_ifinfo() - purge obsolete ifinfo entries from originator + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: orig node which is to be checked + * + * Return: true if any ifinfo entry was purged, false otherwise. + */ +static bool +batadv_purge_orig_ifinfo(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node) +{ + struct batadv_orig_ifinfo *orig_ifinfo; + struct batadv_hard_iface *if_outgoing; + struct hlist_node *node_tmp; + bool ifinfo_purged = false; + + spin_lock_bh(&orig_node->neigh_list_lock); + + /* for all ifinfo objects for this originator */ + hlist_for_each_entry_safe(orig_ifinfo, node_tmp, + &orig_node->ifinfo_list, list) { + if_outgoing = orig_ifinfo->if_outgoing; + + /* always keep the default interface */ + if (if_outgoing == BATADV_IF_DEFAULT) + continue; + + /* don't purge if the interface is not (going) down */ + if (if_outgoing->if_status != BATADV_IF_INACTIVE && + if_outgoing->if_status != BATADV_IF_NOT_IN_USE && + if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED) + continue; + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "router/ifinfo purge: originator %pM, iface: %s\n", + orig_node->orig, if_outgoing->net_dev->name); + + ifinfo_purged = true; + + hlist_del_rcu(&orig_ifinfo->list); + batadv_orig_ifinfo_put(orig_ifinfo); + if (orig_node->last_bonding_candidate == orig_ifinfo) { + orig_node->last_bonding_candidate = NULL; + batadv_orig_ifinfo_put(orig_ifinfo); + } + } + + spin_unlock_bh(&orig_node->neigh_list_lock); + + return ifinfo_purged; +} + +/** + * batadv_purge_orig_neighbors() - purges neighbors from originator + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: orig node which is to be checked + * + * Return: true if any neighbor was purged, false otherwise + */ +static bool +batadv_purge_orig_neighbors(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node) +{ + struct hlist_node *node_tmp; + struct batadv_neigh_node *neigh_node; + bool neigh_purged = false; + unsigned long last_seen; + struct batadv_hard_iface *if_incoming; + + spin_lock_bh(&orig_node->neigh_list_lock); + + /* for all neighbors towards this originator ... */ + hlist_for_each_entry_safe(neigh_node, node_tmp, + &orig_node->neigh_list, list) { + last_seen = neigh_node->last_seen; + if_incoming = neigh_node->if_incoming; + + if (batadv_has_timed_out(last_seen, BATADV_PURGE_TIMEOUT) || + if_incoming->if_status == BATADV_IF_INACTIVE || + if_incoming->if_status == BATADV_IF_NOT_IN_USE || + if_incoming->if_status == BATADV_IF_TO_BE_REMOVED) { + if (if_incoming->if_status == BATADV_IF_INACTIVE || + if_incoming->if_status == BATADV_IF_NOT_IN_USE || + if_incoming->if_status == BATADV_IF_TO_BE_REMOVED) + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "neighbor purge: originator %pM, neighbor: %pM, iface: %s\n", + orig_node->orig, neigh_node->addr, + if_incoming->net_dev->name); + else + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "neighbor timeout: originator %pM, neighbor: %pM, last_seen: %u\n", + orig_node->orig, neigh_node->addr, + jiffies_to_msecs(last_seen)); + + neigh_purged = true; + + hlist_del_rcu(&neigh_node->list); + batadv_neigh_node_put(neigh_node); + } else { + /* only necessary if not the whole neighbor is to be + * deleted, but some interface has been removed. + */ + batadv_purge_neigh_ifinfo(bat_priv, neigh_node); + } + } + + spin_unlock_bh(&orig_node->neigh_list_lock); + return neigh_purged; +} + +/** + * batadv_find_best_neighbor() - finds the best neighbor after purging + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: orig node which is to be checked + * @if_outgoing: the interface for which the metric should be compared + * + * Return: the current best neighbor, with refcount increased. + */ +static struct batadv_neigh_node * +batadv_find_best_neighbor(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + struct batadv_hard_iface *if_outgoing) +{ + struct batadv_neigh_node *best = NULL, *neigh; + struct batadv_algo_ops *bao = bat_priv->algo_ops; + + rcu_read_lock(); + hlist_for_each_entry_rcu(neigh, &orig_node->neigh_list, list) { + if (best && (bao->neigh.cmp(neigh, if_outgoing, best, + if_outgoing) <= 0)) + continue; + + if (!kref_get_unless_zero(&neigh->refcount)) + continue; + + batadv_neigh_node_put(best); + + best = neigh; + } + rcu_read_unlock(); + + return best; +} + +/** + * batadv_purge_orig_node() - purges obsolete information from an orig_node + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: orig node which is to be checked + * + * This function checks if the orig_node or substructures of it have become + * obsolete, and purges this information if that's the case. + * + * Return: true if the orig_node is to be removed, false otherwise. + */ +static bool batadv_purge_orig_node(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node) +{ + struct batadv_neigh_node *best_neigh_node; + struct batadv_hard_iface *hard_iface; + bool changed_ifinfo, changed_neigh; + + if (batadv_has_timed_out(orig_node->last_seen, + 2 * BATADV_PURGE_TIMEOUT)) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Originator timeout: originator %pM, last_seen %u\n", + orig_node->orig, + jiffies_to_msecs(orig_node->last_seen)); + return true; + } + changed_ifinfo = batadv_purge_orig_ifinfo(bat_priv, orig_node); + changed_neigh = batadv_purge_orig_neighbors(bat_priv, orig_node); + + if (!changed_ifinfo && !changed_neigh) + return false; + + /* first for NULL ... */ + best_neigh_node = batadv_find_best_neighbor(bat_priv, orig_node, + BATADV_IF_DEFAULT); + batadv_update_route(bat_priv, orig_node, BATADV_IF_DEFAULT, + best_neigh_node); + batadv_neigh_node_put(best_neigh_node); + + /* ... then for all other interfaces. */ + rcu_read_lock(); + list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { + if (hard_iface->if_status != BATADV_IF_ACTIVE) + continue; + + if (hard_iface->soft_iface != bat_priv->soft_iface) + continue; + + if (!kref_get_unless_zero(&hard_iface->refcount)) + continue; + + best_neigh_node = batadv_find_best_neighbor(bat_priv, + orig_node, + hard_iface); + batadv_update_route(bat_priv, orig_node, hard_iface, + best_neigh_node); + batadv_neigh_node_put(best_neigh_node); + + batadv_hardif_put(hard_iface); + } + rcu_read_unlock(); + + return false; +} + +/** + * batadv_purge_orig_ref() - Purge all outdated originators + * @bat_priv: the bat priv with all the soft interface information + */ +void batadv_purge_orig_ref(struct batadv_priv *bat_priv) +{ + struct batadv_hashtable *hash = bat_priv->orig_hash; + struct hlist_node *node_tmp; + struct hlist_head *head; + spinlock_t *list_lock; /* spinlock to protect write access */ + struct batadv_orig_node *orig_node; + u32 i; + + if (!hash) + return; + + /* for all origins... */ + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + list_lock = &hash->list_locks[i]; + + spin_lock_bh(list_lock); + hlist_for_each_entry_safe(orig_node, node_tmp, + head, hash_entry) { + if (batadv_purge_orig_node(bat_priv, orig_node)) { + batadv_gw_node_delete(bat_priv, orig_node); + hlist_del_rcu(&orig_node->hash_entry); + batadv_tt_global_del_orig(orig_node->bat_priv, + orig_node, -1, + "originator timed out"); + batadv_orig_node_put(orig_node); + continue; + } + + batadv_frag_purge_orig(orig_node, + batadv_frag_check_entry); + } + spin_unlock_bh(list_lock); + } + + batadv_gw_election(bat_priv); +} + +static void batadv_purge_orig(struct work_struct *work) +{ + struct delayed_work *delayed_work; + struct batadv_priv *bat_priv; + + delayed_work = to_delayed_work(work); + bat_priv = container_of(delayed_work, struct batadv_priv, orig_work); + batadv_purge_orig_ref(bat_priv); + queue_delayed_work(batadv_event_workqueue, + &bat_priv->orig_work, + msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD)); +} + +/** + * batadv_orig_dump() - Dump to netlink the originator infos for a specific + * outgoing interface + * @msg: message to dump into + * @cb: parameters for the dump + * + * Return: 0 or error value + */ +int batadv_orig_dump(struct sk_buff *msg, struct netlink_callback *cb) +{ + struct net *net = sock_net(cb->skb->sk); + struct net_device *soft_iface; + struct net_device *hard_iface = NULL; + struct batadv_hard_iface *hardif = BATADV_IF_DEFAULT; + struct batadv_priv *bat_priv; + struct batadv_hard_iface *primary_if = NULL; + int ret; + int ifindex, hard_ifindex; + + ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX); + if (!ifindex) + return -EINVAL; + + soft_iface = dev_get_by_index(net, ifindex); + if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { + ret = -ENODEV; + goto out; + } + + bat_priv = netdev_priv(soft_iface); + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { + ret = -ENOENT; + goto out; + } + + hard_ifindex = batadv_netlink_get_ifindex(cb->nlh, + BATADV_ATTR_HARD_IFINDEX); + if (hard_ifindex) { + hard_iface = dev_get_by_index(net, hard_ifindex); + if (hard_iface) + hardif = batadv_hardif_get_by_netdev(hard_iface); + + if (!hardif) { + ret = -ENODEV; + goto out; + } + + if (hardif->soft_iface != soft_iface) { + ret = -ENOENT; + goto out; + } + } + + if (!bat_priv->algo_ops->orig.dump) { + ret = -EOPNOTSUPP; + goto out; + } + + bat_priv->algo_ops->orig.dump(msg, cb, bat_priv, hardif); + + ret = msg->len; + + out: + batadv_hardif_put(hardif); + dev_put(hard_iface); + batadv_hardif_put(primary_if); + dev_put(soft_iface); + + return ret; +} |