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|
- // SPDX-License-Identifier: GPL-2.0
- /* Copyright (C) 2007-2020 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/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/kernel.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/seq_file.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)
- {
- struct batadv_tt_common_entry *tt;
- u32 hash = 0;
- tt = (struct batadv_tt_common_entry *)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");
- tt_global = NULL;
- } 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:
- if (in_hardif)
- batadv_hardif_put(in_hardif);
- if (in_dev)
- dev_put(in_dev);
- if (tt_local)
- batadv_tt_local_entry_put(tt_local);
- if (tt_global)
- 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);
- }
- #ifdef CONFIG_BATMAN_ADV_DEBUGFS
- /**
- * batadv_tt_local_seq_print_text() - Print the local tt table in a seq file
- * @seq: seq file to print on
- * @offset: not used
- *
- * Return: always 0
- */
- int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
- {
- struct net_device *net_dev = (struct net_device *)seq->private;
- struct batadv_priv *bat_priv = netdev_priv(net_dev);
- struct batadv_hashtable *hash = bat_priv->tt.local_hash;
- struct batadv_tt_common_entry *tt_common_entry;
- struct batadv_tt_local_entry *tt_local;
- struct batadv_hard_iface *primary_if;
- struct hlist_head *head;
- u32 i;
- int last_seen_secs;
- int last_seen_msecs;
- unsigned long last_seen_jiffies;
- bool no_purge;
- u16 np_flag = BATADV_TT_CLIENT_NOPURGE;
- primary_if = batadv_seq_print_text_primary_if_get(seq);
- if (!primary_if)
- goto out;
- seq_printf(seq,
- "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
- net_dev->name, (u8)atomic_read(&bat_priv->tt.vn));
- seq_puts(seq,
- " Client VID Flags Last seen (CRC )\n");
- 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) {
- tt_local = container_of(tt_common_entry,
- struct batadv_tt_local_entry,
- common);
- last_seen_jiffies = jiffies - tt_local->last_seen;
- last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
- last_seen_secs = last_seen_msecs / 1000;
- last_seen_msecs = last_seen_msecs % 1000;
- no_purge = tt_common_entry->flags & np_flag;
- seq_printf(seq,
- " * %pM %4i [%c%c%c%c%c%c] %3u.%03u (%#.8x)\n",
- tt_common_entry->addr,
- batadv_print_vid(tt_common_entry->vid),
- ((tt_common_entry->flags &
- BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
- no_purge ? 'P' : '.',
- ((tt_common_entry->flags &
- BATADV_TT_CLIENT_NEW) ? 'N' : '.'),
- ((tt_common_entry->flags &
- BATADV_TT_CLIENT_PENDING) ? 'X' : '.'),
- ((tt_common_entry->flags &
- BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
- ((tt_common_entry->flags &
- BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
- no_purge ? 0 : last_seen_secs,
- no_purge ? 0 : last_seen_msecs,
- tt_local->vlan->tt.crc);
- }
- rcu_read_unlock();
- }
- out:
- if (primary_if)
- batadv_hardif_put(primary_if);
- return 0;
- }
- #endif
- /**
- * 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:
- if (primary_if)
- batadv_hardif_put(primary_if);
- if (soft_iface)
- 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:
- if (tt_local_entry)
- 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:
- if (orig_entry)
- 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:
- if (tt_global_entry)
- batadv_tt_global_entry_put(tt_global_entry);
- if (tt_local_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 */
- if (best_router)
- batadv_neigh_node_put(best_router);
- best_entry = orig_entry;
- best_router = router;
- }
- if (best_router)
- batadv_neigh_node_put(best_router);
- return best_entry;
- }
- #ifdef CONFIG_BATMAN_ADV_DEBUGFS
- /**
- * batadv_tt_global_print_entry() - print all orig nodes who announce the
- * address for this global entry
- * @bat_priv: the bat priv with all the soft interface information
- * @tt_global_entry: global translation table entry to be printed
- * @seq: debugfs table seq_file struct
- *
- * This function assumes the caller holds rcu_read_lock().
- */
- static void
- batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
- struct batadv_tt_global_entry *tt_global_entry,
- struct seq_file *seq)
- {
- struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
- struct batadv_tt_common_entry *tt_common_entry;
- struct batadv_orig_node_vlan *vlan;
- struct hlist_head *head;
- u8 last_ttvn;
- u16 flags;
- tt_common_entry = &tt_global_entry->common;
- flags = tt_common_entry->flags;
- best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
- if (best_entry) {
- vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
- tt_common_entry->vid);
- if (!vlan) {
- seq_printf(seq,
- " * Cannot retrieve VLAN %d for originator %pM\n",
- batadv_print_vid(tt_common_entry->vid),
- best_entry->orig_node->orig);
- goto print_list;
- }
- last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
- seq_printf(seq,
- " %c %pM %4i (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
- '*', tt_global_entry->common.addr,
- batadv_print_vid(tt_global_entry->common.vid),
- best_entry->ttvn, best_entry->orig_node->orig,
- last_ttvn, vlan->tt.crc,
- ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
- ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
- ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
- ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
- batadv_orig_node_vlan_put(vlan);
- }
- print_list:
- head = &tt_global_entry->orig_list;
- hlist_for_each_entry_rcu(orig_entry, head, list) {
- if (best_entry == orig_entry)
- continue;
- vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
- tt_common_entry->vid);
- if (!vlan) {
- seq_printf(seq,
- " + Cannot retrieve VLAN %d for originator %pM\n",
- batadv_print_vid(tt_common_entry->vid),
- orig_entry->orig_node->orig);
- continue;
- }
- last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
- seq_printf(seq,
- " %c %pM %4d (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
- '+', tt_global_entry->common.addr,
- batadv_print_vid(tt_global_entry->common.vid),
- orig_entry->ttvn, orig_entry->orig_node->orig,
- last_ttvn, vlan->tt.crc,
- ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
- ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
- ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
- ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
- batadv_orig_node_vlan_put(vlan);
- }
- }
- /**
- * batadv_tt_global_seq_print_text() - Print the global tt table in a seq file
- * @seq: seq file to print on
- * @offset: not used
- *
- * Return: always 0
- */
- int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
- {
- struct net_device *net_dev = (struct net_device *)seq->private;
- struct batadv_priv *bat_priv = netdev_priv(net_dev);
- struct batadv_hashtable *hash = bat_priv->tt.global_hash;
- struct batadv_tt_common_entry *tt_common_entry;
- struct batadv_tt_global_entry *tt_global;
- struct batadv_hard_iface *primary_if;
- struct hlist_head *head;
- u32 i;
- primary_if = batadv_seq_print_text_primary_if_get(seq);
- if (!primary_if)
- goto out;
- seq_printf(seq,
- "Globally announced TT entries received via the mesh %s\n",
- net_dev->name);
- seq_puts(seq,
- " Client VID (TTVN) Originator (Curr TTVN) (CRC ) Flags\n");
- 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) {
- tt_global = container_of(tt_common_entry,
- struct batadv_tt_global_entry,
- common);
- batadv_tt_global_print_entry(bat_priv, tt_global, seq);
- }
- rcu_read_unlock();
- }
- out:
- if (primary_if)
- batadv_hardif_put(primary_if);
- return 0;
- }
- #endif
- /**
- * 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:
- if (primary_if)
- batadv_hardif_put(primary_if);
- if (soft_iface)
- 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:
- if (tt_global_entry)
- batadv_tt_global_entry_put(tt_global_entry);
- if (local_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:
- if (tt_global_entry)
- batadv_tt_global_entry_put(tt_global_entry);
- if (tt_local_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 = (struct batadv_tvlv_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:
- if (primary_if)
- 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);
- }
- if (tt_req_node)
- 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:
- if (res_dst_orig_node)
- batadv_orig_node_put(res_dst_orig_node);
- if (req_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);
- if (orig_node)
- batadv_orig_node_put(orig_node);
- if (primary_if)
- 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:
- if (orig_node)
- 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:
- if (tt_local_entry)
- 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:
- if (orig_node)
- 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:
- if (primary_if)
- 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 = (struct batadv_tvlv_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 = (struct batadv_tvlv_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 = (struct batadv_tvlv_roam_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:
- if (orig_node)
- 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);
- }
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