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-rw-r--r--kernel/net/batman-adv/translation-table.c3710
1 files changed, 3710 insertions, 0 deletions
diff --git a/kernel/net/batman-adv/translation-table.c b/kernel/net/batman-adv/translation-table.c
new file mode 100644
index 000000000..07b263a43
--- /dev/null
+++ b/kernel/net/batman-adv/translation-table.c
@@ -0,0 +1,3710 @@
+/* Copyright (C) 2007-2014 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich, Antonio Quartulli
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "main.h"
+#include "translation-table.h"
+#include "soft-interface.h"
+#include "hard-interface.h"
+#include "send.h"
+#include "hash.h"
+#include "originator.h"
+#include "routing.h"
+#include "bridge_loop_avoidance.h"
+#include "multicast.h"
+
+#include <linux/crc32c.h>
+
+/* 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, uint8_t *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);
+
+/* returns 1 if they are the same mac addr */
+static int batadv_compare_tt(const struct hlist_node *node, const void *data2)
+{
+ const void *data1 = container_of(node, struct batadv_tt_common_entry,
+ hash_entry);
+
+ return 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
+ *
+ * Returns the hash index where the object represented by 'data' should be
+ * stored at.
+ */
+static inline uint32_t batadv_choose_tt(const void *data, uint32_t size)
+{
+ struct batadv_tt_common_entry *tt;
+ uint32_t hash = 0;
+
+ tt = (struct batadv_tt_common_entry *)data;
+ hash = batadv_hash_bytes(hash, &tt->addr, ETH_ALEN);
+ hash = batadv_hash_bytes(hash, &tt->vid, sizeof(tt->vid));
+
+ hash += (hash << 3);
+ hash ^= (hash >> 11);
+ hash += (hash << 15);
+
+ 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
+ *
+ * Returns 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 uint8_t *addr,
+ unsigned short vid)
+{
+ struct hlist_head *head;
+ struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL;
+ uint32_t 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 (!atomic_inc_not_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
+ *
+ * Returns 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 uint8_t *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
+ *
+ * Returns a pointer to the corresponding tt_global_entry struct if the client
+ * is found, NULL otherwise.
+ */
+static struct batadv_tt_global_entry *
+batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const uint8_t *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;
+}
+
+static void
+batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry)
+{
+ if (atomic_dec_and_test(&tt_local_entry->common.refcount))
+ kfree_rcu(tt_local_entry, common.rcu);
+}
+
+/**
+ * batadv_tt_global_entry_free_ref - decrement the refcounter for a
+ * tt_global_entry and possibly free it
+ * @tt_global_entry: the object to free
+ */
+static void
+batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry)
+{
+ if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
+ batadv_tt_global_del_orig_list(tt_global_entry);
+ kfree_rcu(tt_global_entry, common.rcu);
+ }
+}
+
+/**
+ * batadv_tt_global_hash_count - count the number of orig entries
+ * @hash: hash table containing the tt entries
+ * @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 ourself).
+ */
+int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
+ const uint8_t *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_free_ref(tt_global_entry);
+
+ return count;
+}
+
+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);
+
+ /* We are in an rcu callback here, therefore we cannot use
+ * batadv_orig_node_free_ref() and its call_rcu():
+ * An rcu_barrier() wouldn't wait for that to finish
+ */
+ batadv_orig_node_free_ref_now(orig_entry->orig_node);
+ kfree(orig_entry);
+}
+
+/**
+ * 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_free_ref(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 local table
+ * identified by vid
+ * @bat_priv: the bat priv with all the soft interface information
+ * @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);
+ list_del_rcu(&vlan->list);
+ spin_unlock_bh(&orig_node->vlan_list_lock);
+ batadv_orig_node_vlan_free_ref(vlan);
+ }
+
+ batadv_orig_node_vlan_free_ref(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);
+}
+
+static void
+batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry)
+{
+ if (!atomic_dec_and_test(&orig_entry->refcount))
+ return;
+
+ call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
+}
+
+/**
+ * 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,
+ uint8_t event_flags)
+{
+ struct batadv_tt_change_node *tt_change_node, *entry, *safe;
+ struct batadv_tt_common_entry *common = &tt_local_entry->common;
+ uint8_t flags = common->flags | event_flags;
+ bool event_removed = false;
+ bool del_op_requested, del_op_entry;
+
+ tt_change_node = kmalloc(sizeof(*tt_change_node), 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);
+ kfree(entry);
+ kfree(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
+ *
+ * Returns 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
+ *
+ * Returns the number of entries.
+ */
+static uint16_t batadv_tt_entries(uint16_t 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
+ *
+ * Returns local translation table size in bytes.
+ */
+static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
+{
+ uint16_t num_vlan = 0, 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)
+{
+ 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);
+
+ batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
+ batadv_choose_tt, &tt_global->common);
+ batadv_tt_global_entry_free_ref(tt_global);
+}
+
+/**
+ * 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)
+ *
+ * Returns true if the client was successfully added, false otherwise.
+ */
+bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
+ unsigned short vid, int ifindex, uint32_t 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 batadv_softif_vlan *vlan;
+ struct net_device *in_dev = NULL;
+ struct hlist_head *head;
+ struct batadv_tt_orig_list_entry *orig_entry;
+ int hash_added, table_size, packet_size_max;
+ bool ret = false, roamed_back = false;
+ uint8_t remote_flags;
+ uint32_t match_mark;
+
+ if (ifindex != BATADV_NULL_IFINDEX)
+ in_dev = dev_get_by_index(&init_net, ifindex);
+
+ 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 = kmalloc(sizeof(*tt_local), GFP_ATOMIC);
+ if (!tt_local)
+ goto out;
+
+ /* increase the refcounter of the related vlan */
+ vlan = batadv_softif_vlan_get(bat_priv, vid);
+
+ batadv_dbg(BATADV_DBG_TT, bat_priv,
+ "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
+ addr, BATADV_PRINT_VID(vid),
+ (uint8_t)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_netdev(in_dev))
+ tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
+ atomic_set(&tt_local->common.refcount, 2);
+ tt_local->last_seen = jiffies;
+ tt_local->common.added_at = tt_local->last_seen;
+
+ /* 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;
+
+ 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_free_ref(tt_local);
+ batadv_softif_vlan_free_ref(vlan);
+ 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_netdev(in_dev))
+ 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_dev)
+ dev_put(in_dev);
+ if (tt_local)
+ batadv_tt_local_entry_free_ref(tt_local);
+ if (tt_global)
+ batadv_tt_global_entry_free_ref(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 by 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 uint16_t
+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,
+ int32_t *tt_len)
+{
+ uint16_t num_vlan = 0, num_entries = 0, change_offset, tvlv_len;
+ struct batadv_tvlv_tt_vlan_data *tt_vlan;
+ struct batadv_orig_node_vlan *vlan;
+ uint8_t *tt_change_ptr;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(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);
+ list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
+ tt_vlan->vid = htons(vlan->vid);
+ tt_vlan->crc = htonl(vlan->tt.crc);
+
+ tt_vlan++;
+ }
+
+ tt_change_ptr = (uint8_t *)*tt_data + change_offset;
+ *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
+
+out:
+ rcu_read_unlock();
+ 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 uint16_t
+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,
+ int32_t *tt_len)
+{
+ struct batadv_tvlv_tt_vlan_data *tt_vlan;
+ struct batadv_softif_vlan *vlan;
+ uint16_t num_vlan = 0, num_entries = 0, tvlv_len;
+ uint8_t *tt_change_ptr;
+ int change_offset;
+
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(vlan, &bat_priv->softif_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) {
+ 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_rcu(vlan, &bat_priv->softif_vlan_list, list) {
+ tt_vlan->vid = htons(vlan->vid);
+ tt_vlan->crc = htonl(vlan->tt.crc);
+
+ tt_vlan++;
+ }
+
+ tt_change_ptr = (uint8_t *)*tt_data + change_offset;
+ *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
+
+out:
+ rcu_read_unlock();
+ 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, tt_diff_entries_count = 0;
+ uint16_t 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);
+ kfree(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);
+}
+
+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 batadv_softif_vlan *vlan;
+ struct hlist_head *head;
+ unsigned short vid;
+ uint32_t i;
+ int last_seen_secs;
+ int last_seen_msecs;
+ unsigned long last_seen_jiffies;
+ bool no_purge;
+ uint16_t 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, (uint8_t)atomic_read(&bat_priv->tt.vn));
+ seq_printf(seq, " %-13s %s %-8s %-9s (%-10s)\n", "Client", "VID",
+ "Flags", "Last seen", "CRC");
+
+ 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);
+ vid = tt_common_entry->vid;
+ 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;
+
+ vlan = batadv_softif_vlan_get(bat_priv, vid);
+ if (!vlan) {
+ seq_printf(seq, "Cannot retrieve VLAN %d\n",
+ BATADV_PRINT_VID(vid));
+ continue;
+ }
+
+ 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,
+ vlan->tt.crc);
+
+ batadv_softif_vlan_free_ref(vlan);
+ }
+ rcu_read_unlock();
+ }
+out:
+ if (primary_if)
+ batadv_hardif_free_ref(primary_if);
+ return 0;
+}
+
+static void
+batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
+ struct batadv_tt_local_entry *tt_local_entry,
+ uint16_t 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
+ *
+ * Returns the flags assigned to the local entry before being deleted
+ */
+uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv,
+ const uint8_t *addr, unsigned short vid,
+ const char *message, bool roaming)
+{
+ struct batadv_tt_local_entry *tt_local_entry;
+ uint16_t flags, curr_flags = BATADV_NO_FLAGS;
+ struct batadv_softif_vlan *vlan;
+
+ 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);
+ hlist_del_rcu(&tt_local_entry->common.hash_entry);
+ batadv_tt_local_entry_free_ref(tt_local_entry);
+
+ /* decrease the reference held for this vlan */
+ vlan = batadv_softif_vlan_get(bat_priv, vid);
+ batadv_softif_vlan_free_ref(vlan);
+ batadv_softif_vlan_free_ref(vlan);
+
+out:
+ if (tt_local_entry)
+ batadv_tt_local_entry_free_ref(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 */
+ uint32_t 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 batadv_softif_vlan *vlan;
+ struct hlist_node *node_tmp;
+ struct hlist_head *head;
+ uint32_t 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);
+
+ /* decrease the reference held for this vlan */
+ vlan = batadv_softif_vlan_get(bat_priv,
+ tt_common_entry->vid);
+ batadv_softif_vlan_free_ref(vlan);
+ batadv_softif_vlan_free_ref(vlan);
+
+ batadv_tt_local_entry_free_ref(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);
+ kfree(entry);
+ }
+
+ atomic_set(&bat_priv->tt.local_changes, 0);
+ spin_unlock_bh(&bat_priv->tt.changes_list_lock);
+}
+
+/* retrieves the orig_tt_list_entry belonging to orig_node from the
+ * batadv_tt_global_entry list
+ *
+ * returns 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 (!atomic_inc_not_zero(&tmp_orig_entry->refcount))
+ continue;
+
+ orig_entry = tmp_orig_entry;
+ break;
+ }
+ rcu_read_unlock();
+
+ return orig_entry;
+}
+
+/* find out if an orig_node is already in the list of a tt_global_entry.
+ * returns 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)
+{
+ 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;
+ batadv_tt_orig_list_entry_free_ref(orig_entry);
+ }
+
+ return found;
+}
+
+static void
+batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
+ struct batadv_orig_node *orig_node, int ttvn)
+{
+ struct batadv_tt_orig_list_entry *orig_entry;
+
+ 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;
+ goto out;
+ }
+
+ orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
+ if (!orig_entry)
+ goto out;
+
+ INIT_HLIST_NODE(&orig_entry->list);
+ atomic_inc(&orig_node->refcount);
+ batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
+ orig_entry->orig_node = orig_node;
+ orig_entry->ttvn = ttvn;
+ atomic_set(&orig_entry->refcount, 2);
+
+ spin_lock_bh(&tt_global->list_lock);
+ hlist_add_head_rcu(&orig_entry->list,
+ &tt_global->orig_list);
+ spin_unlock_bh(&tt_global->list_lock);
+ atomic_inc(&tt_global->orig_list_count);
+
+out:
+ if (orig_entry)
+ batadv_tt_orig_list_entry_free_ref(orig_entry);
+}
+
+/**
+ * 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 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, uint16_t flags,
+ uint8_t 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;
+ uint16_t 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 = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
+ if (!tt_global_entry)
+ goto out;
+
+ common = &tt_global_entry->common;
+ ether_addr_copy(common->addr, tt_addr);
+ common->vid = vid;
+
+ common->flags = flags;
+ 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;
+ atomic_set(&common->refcount, 2);
+ 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);
+
+ 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_free_ref(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))
+ 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
+ */
+ common->flags &= ~BATADV_TT_CLIENT_TEMP;
+
+ /* the change can carry possible "attribute" flags like the
+ * TT_CLIENT_WIFI, therefore they have to be copied in the
+ * client entry
+ */
+ tt_global_entry->common.flags |= flags;
+
+ /* 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);
+
+ 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_free_ref(tt_global_entry);
+ if (tt_local_entry)
+ batadv_tt_local_entry_free_ref(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 functon assumes the caller holds rcu_read_lock().
+ * Returns 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->bat_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->bat_neigh_cmp(router, BATADV_IF_DEFAULT,
+ best_router, BATADV_IF_DEFAULT) <= 0) {
+ batadv_neigh_node_free_ref(router);
+ continue;
+ }
+
+ /* release the refcount for the "old" best */
+ if (best_router)
+ batadv_neigh_node_free_ref(best_router);
+
+ best_entry = orig_entry;
+ best_router = router;
+ }
+
+ if (best_router)
+ batadv_neigh_node_free_ref(best_router);
+
+ return best_entry;
+}
+
+/**
+ * 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 functon 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;
+ uint8_t last_ttvn;
+ uint16_t 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_free_ref(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_free_ref(vlan);
+ }
+}
+
+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;
+ uint32_t 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_printf(seq, " %-13s %s %s %-15s %s (%-10s) %s\n",
+ "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
+ "CRC", "Flags");
+
+ 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_free_ref(primary_if);
+ return 0;
+}
+
+/**
+ * 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.
+ */
+static void
+batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
+ struct batadv_tt_orig_list_entry *orig_entry)
+{
+ batadv_tt_global_size_dec(orig_entry->orig_node,
+ tt_global_entry->common.vid);
+ atomic_dec(&tt_global_entry->orig_list_count);
+ hlist_del_rcu(&orig_entry->list);
+ batadv_tt_orig_list_entry_free_ref(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_free_ref(tt_global_entry);
+ if (local_entry)
+ batadv_tt_local_entry_free_ref(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,
+ int32_t match_vid,
+ const char *message)
+{
+ struct batadv_tt_global_entry *tt_global;
+ struct batadv_tt_common_entry *tt_common_entry;
+ uint32_t 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_free_ref(tt_global);
+ }
+ }
+ spin_unlock_bh(list_lock);
+ }
+ orig_node->capa_initialized &= ~BATADV_ORIG_CAPA_HAS_TT;
+}
+
+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 */
+ uint32_t 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_free_ref(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;
+ uint32_t 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_free_ref(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)
+{
+ bool ret = false;
+
+ if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
+ tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
+ ret = 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)
+ ret = true;
+
+ return ret;
+}
+
+/**
+ * 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
+ *
+ * Returns 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 uint8_t *src,
+ const uint8_t *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 && !atomic_inc_not_zero(&orig_node->refcount))
+ orig_node = NULL;
+ rcu_read_unlock();
+
+out:
+ if (tt_global_entry)
+ batadv_tt_global_entry_free_ref(tt_global_entry);
+ if (tt_local_entry)
+ batadv_tt_local_entry_free_ref(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.
+ *
+ * Returns the checksum of the global table of a given originator.
+ */
+static uint32_t 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_common_entry *tt_common;
+ struct batadv_tt_global_entry *tt_global;
+ struct hlist_head *head;
+ uint32_t i, crc_tmp, crc = 0;
+ uint8_t 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
+ */
+ if (!batadv_tt_global_entry_has_orig(tt_global,
+ orig_node))
+ 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_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().
+ *
+ * Returns the checksum of the local table
+ */
+static uint32_t 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;
+ uint32_t i, crc_tmp, crc = 0;
+ uint8_t 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;
+}
+
+static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
+{
+ struct batadv_tt_req_node *node, *safe;
+
+ spin_lock_bh(&bat_priv->tt.req_list_lock);
+
+ list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
+ list_del(&node->list);
+ kfree(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,
+ uint16_t 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, *safe;
+
+ spin_lock_bh(&bat_priv->tt.req_list_lock);
+ list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
+ if (batadv_has_timed_out(node->issued_at,
+ BATADV_TT_REQUEST_TIMEOUT)) {
+ list_del(&node->list);
+ kfree(node);
+ }
+ }
+ spin_unlock_bh(&bat_priv->tt.req_list_lock);
+}
+
+/* returns 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_new_tt_req_node(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);
+ list_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 = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
+ if (!tt_req_node)
+ goto unlock;
+
+ ether_addr_copy(tt_req_node->addr, orig_node->orig);
+ tt_req_node->issued_at = jiffies;
+
+ list_add(&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 that given tt entry is a valid one
+ * @entry_ptr: to be checked local tt entry
+ * @data_ptr: not used but definition required to satisfy the callback prototype
+ *
+ * Returns 1 if the entry is a valid, 0 otherwise.
+ */
+static int batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
+{
+ const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
+
+ if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
+ return 0;
+ return 1;
+}
+
+static int batadv_tt_global_valid(const void *entry_ptr,
+ const void *data_ptr)
+{
+ 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 0;
+
+ 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);
+}
+
+/**
+ * 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
+ * @cb_data: data passed to the filter function as argument
+ */
+static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
+ struct batadv_hashtable *hash,
+ void *tvlv_buff, uint16_t tt_len,
+ int (*valid_cb)(const void *, const void *),
+ void *cb_data)
+{
+ struct batadv_tt_common_entry *tt_common_entry;
+ struct batadv_tvlv_tt_change *tt_change;
+ struct hlist_head *head;
+ uint16_t tt_tot, tt_num_entries = 0;
+ uint32_t i;
+
+ tt_tot = batadv_tt_entries(tt_len);
+ tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
+
+ 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;
+
+ if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
+ continue;
+
+ ether_addr_copy(tt_change->addr, tt_common_entry->addr);
+ tt_change->flags = tt_common_entry->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
+ * @create: if true, create VLAN objects if not found
+ *
+ * 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,
+ uint16_t num_vlan)
+{
+ struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
+ struct batadv_orig_node_vlan *vlan;
+ uint32_t crc;
+ int i;
+
+ /* 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_free_ref(vlan);
+
+ if (crc != ntohl(tt_vlan_tmp->crc))
+ 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;
+ uint32_t crc;
+
+ /* recompute the global CRC for each VLAN */
+ rcu_read_lock();
+ list_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
+ */
+static int batadv_send_tt_request(struct batadv_priv *bat_priv,
+ struct batadv_orig_node *dst_orig_node,
+ uint8_t ttvn,
+ struct batadv_tvlv_tt_vlan_data *tt_vlan,
+ uint16_t 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_new_tt_req_node(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_free_ref(primary_if);
+ if (ret && tt_req_node) {
+ spin_lock_bh(&bat_priv->tt.req_list_lock);
+ list_del(&tt_req_node->list);
+ spin_unlock_bh(&bat_priv->tt.req_list_lock);
+ kfree(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
+ *
+ * Returns 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,
+ uint8_t *req_src, uint8_t *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;
+ uint8_t orig_ttvn, req_ttvn;
+ uint16_t tvlv_len;
+ int32_t 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 = (uint8_t)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_free_ref(res_dst_orig_node);
+ if (req_dst_orig_node)
+ batadv_orig_node_free_ref(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
+ *
+ * Returns 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,
+ uint8_t *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;
+ uint8_t my_ttvn, req_ttvn;
+ uint16_t tvlv_len;
+ bool full_table;
+ int32_t 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 = (uint8_t)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)
+ 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 = (uint8_t)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)
+ 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_free_ref(orig_node);
+ if (primary_if)
+ batadv_hardif_free_ref(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
+ *
+ * Returns 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,
+ uint8_t *req_src, uint8_t *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,
+ uint16_t tt_num_changes, uint8_t 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;
+ }
+ }
+ orig_node->capa_initialized |= BATADV_ORIG_CAPA_HAS_TT;
+}
+
+static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
+ struct batadv_tvlv_tt_change *tt_change,
+ uint8_t ttvn, uint8_t *resp_src,
+ uint16_t 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_free_ref(orig_node);
+}
+
+static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
+ struct batadv_orig_node *orig_node,
+ uint16_t tt_num_changes, uint8_t 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
+ *
+ * Returns true if the client is served by this node, false otherwise.
+ */
+bool batadv_is_my_client(struct batadv_priv *bat_priv, const uint8_t *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_free_ref(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,
+ uint8_t *resp_src, uint16_t num_entries)
+{
+ struct batadv_tt_req_node *node, *safe;
+ struct batadv_orig_node *orig_node = NULL;
+ struct batadv_tvlv_tt_change *tt_change;
+ uint8_t *tvlv_ptr = (uint8_t *)tt_data;
+ uint16_t 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);
+ list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
+ if (!batadv_compare_eth(node->addr, resp_src))
+ continue;
+ list_del(&node->list);
+ kfree(node);
+ }
+
+ spin_unlock_bh(&bat_priv->tt.req_list_lock);
+out:
+ if (orig_node)
+ batadv_orig_node_free_ref(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);
+ kfree(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);
+ kfree(node);
+ }
+ spin_unlock_bh(&bat_priv->tt.roam_list_lock);
+}
+
+/* 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.
+ *
+ * returns true if the ROAMING_ADV can be sent, false otherwise
+ */
+static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv,
+ uint8_t *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 = kmalloc(sizeof(*tt_roam_node), 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, uint8_t *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_free_ref(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 = container_of(work, struct 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));
+}
+
+void batadv_tt_free(struct batadv_priv *bat_priv)
+{
+ 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,
+ uint16_t flags, bool enable, bool count)
+{
+ struct batadv_hashtable *hash = bat_priv->tt.local_hash;
+ struct batadv_tt_common_entry *tt_common_entry;
+ uint16_t changed_num = 0;
+ struct hlist_head *head;
+ uint32_t 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;
+ }
+ changed_num++;
+
+ 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 batadv_softif_vlan *vlan;
+ struct hlist_node *node_tmp;
+ struct hlist_head *head;
+ spinlock_t *list_lock; /* protects write access to the hash lists */
+ uint32_t 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);
+
+ /* decrease the reference held for this vlan */
+ vlan = batadv_softif_vlan_get(bat_priv, tt_common->vid);
+ batadv_softif_vlan_free_ref(vlan);
+ batadv_softif_vlan_free_ref(vlan);
+
+ batadv_tt_local_entry_free_ref(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)
+{
+ /* Update multicast addresses in local translation table */
+ batadv_mcast_mla_update(bat_priv);
+
+ 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",
+ (uint8_t)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);
+}
+
+bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src,
+ uint8_t *dst, unsigned short vid)
+{
+ struct batadv_tt_local_entry *tt_local_entry = NULL;
+ struct batadv_tt_global_entry *tt_global_entry = NULL;
+ struct batadv_softif_vlan *vlan;
+ bool ret = false;
+
+ vlan = batadv_softif_vlan_get(bat_priv, vid);
+ if (!vlan || !atomic_read(&vlan->ap_isolation))
+ goto out;
+
+ tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
+ if (!tt_local_entry)
+ goto out;
+
+ tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
+ if (!tt_global_entry)
+ goto out;
+
+ if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
+ goto out;
+
+ ret = true;
+
+out:
+ if (vlan)
+ batadv_softif_vlan_free_ref(vlan);
+ if (tt_global_entry)
+ batadv_tt_global_entry_free_ref(tt_global_entry);
+ if (tt_local_entry)
+ batadv_tt_local_entry_free_ref(tt_local_entry);
+ 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: the orig_node of the ogm
+ * @tt_vlan: 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
+ * @tt_crc: crc32 checksum of orig node's translation table
+ */
+static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
+ struct batadv_orig_node *orig_node,
+ const void *tt_buff, uint16_t tt_num_vlan,
+ struct batadv_tvlv_tt_change *tt_change,
+ uint16_t tt_num_changes, uint8_t ttvn)
+{
+ uint8_t orig_ttvn = (uint8_t)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 = orig_node->capa_initialized & BATADV_ORIG_CAPA_HAS_TT;
+
+ /* 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
+ *
+ * Returns 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,
+ uint8_t *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_free_ref(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
+ *
+ * Returns 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,
+ uint8_t *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_free_ref(tt_local_entry);
+out:
+ return ret;
+}
+
+bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
+ struct batadv_orig_node *orig_node,
+ const unsigned char *addr,
+ unsigned short vid)
+{
+ bool ret = false;
+
+ if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
+ BATADV_TT_CLIENT_TEMP,
+ atomic_read(&orig_node->last_ttvn)))
+ goto out;
+
+ 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);
+ ret = true;
+out:
+ return ret;
+}
+
+/**
+ * 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,
+ uint8_t flags, void *tvlv_value,
+ uint16_t 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;
+ uint16_t 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
+ *
+ * Returns 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,
+ uint8_t *src, uint8_t *dst,
+ void *tvlv_value,
+ uint16_t tvlv_value_len)
+{
+ struct batadv_tvlv_tt_data *tt_data;
+ uint16_t 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
+ *
+ * Returns 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,
+ uint8_t *src, uint8_t *dst,
+ void *tvlv_value,
+ uint16_t 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_free_ref(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)
+ 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
+ *
+ * Returns 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 uint8_t *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_free_ref(tt);
+
+ return ret;
+}