1 /* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors:
3 * Marek Lindner, Simon Wunderlich, Antonio Quartulli
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of version 2 of the GNU General Public
7 * License as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 #include "translation-table.h"
22 #include "soft-interface.h"
23 #include "hard-interface.h"
26 #include "originator.h"
28 #include "bridge_loop_avoidance.h"
30 #include <linux/crc32c.h>
33 static struct lock_class_key batadv_tt_local_hash_lock_class_key;
34 static struct lock_class_key batadv_tt_global_hash_lock_class_key;
36 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
38 struct batadv_orig_node *orig_node);
39 static void batadv_tt_purge(struct work_struct *work);
41 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
42 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
43 struct batadv_orig_node *orig_node,
44 const unsigned char *addr,
45 unsigned short vid, const char *message,
48 /* returns 1 if they are the same mac addr */
49 static int batadv_compare_tt(const struct hlist_node *node, const void *data2)
51 const void *data1 = container_of(node, struct batadv_tt_common_entry,
54 return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
58 * batadv_choose_tt - return the index of the tt entry in the hash table
59 * @data: pointer to the tt_common_entry object to map
60 * @size: the size of the hash table
62 * Returns the hash index where the object represented by 'data' should be
65 static inline uint32_t batadv_choose_tt(const void *data, uint32_t size)
67 struct batadv_tt_common_entry *tt;
70 tt = (struct batadv_tt_common_entry *)data;
71 hash = batadv_hash_bytes(hash, &tt->addr, ETH_ALEN);
72 hash = batadv_hash_bytes(hash, &tt->vid, sizeof(tt->vid));
82 * batadv_tt_hash_find - look for a client in the given hash table
83 * @hash: the hash table to search
84 * @addr: the mac address of the client to look for
85 * @vid: VLAN identifier
87 * Returns a pointer to the tt_common struct belonging to the searched client if
88 * found, NULL otherwise.
90 static struct batadv_tt_common_entry *
91 batadv_tt_hash_find(struct batadv_hashtable *hash, const uint8_t *addr,
94 struct hlist_head *head;
95 struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL;
101 memcpy(to_search.addr, addr, ETH_ALEN);
104 index = batadv_choose_tt(&to_search, hash->size);
105 head = &hash->table[index];
108 hlist_for_each_entry_rcu(tt, head, hash_entry) {
109 if (!batadv_compare_eth(tt, addr))
115 if (!atomic_inc_not_zero(&tt->refcount))
127 * batadv_tt_local_hash_find - search the local table for a given client
128 * @bat_priv: the bat priv with all the soft interface information
129 * @addr: the mac address of the client to look for
130 * @vid: VLAN identifier
132 * Returns a pointer to the corresponding tt_local_entry struct if the client is
133 * found, NULL otherwise.
135 static struct batadv_tt_local_entry *
136 batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const uint8_t *addr,
139 struct batadv_tt_common_entry *tt_common_entry;
140 struct batadv_tt_local_entry *tt_local_entry = NULL;
142 tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, addr,
145 tt_local_entry = container_of(tt_common_entry,
146 struct batadv_tt_local_entry,
148 return tt_local_entry;
152 * batadv_tt_global_hash_find - search the global table for a given client
153 * @bat_priv: the bat priv with all the soft interface information
154 * @addr: the mac address of the client to look for
155 * @vid: VLAN identifier
157 * Returns a pointer to the corresponding tt_global_entry struct if the client
158 * is found, NULL otherwise.
160 static struct batadv_tt_global_entry *
161 batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const uint8_t *addr,
164 struct batadv_tt_common_entry *tt_common_entry;
165 struct batadv_tt_global_entry *tt_global_entry = NULL;
167 tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, addr,
170 tt_global_entry = container_of(tt_common_entry,
171 struct batadv_tt_global_entry,
173 return tt_global_entry;
177 batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry)
179 if (atomic_dec_and_test(&tt_local_entry->common.refcount))
180 kfree_rcu(tt_local_entry, common.rcu);
184 * batadv_tt_global_entry_free_ref - decrement the refcounter for a
185 * tt_global_entry and possibly free it
186 * @tt_global_entry: the object to free
189 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry)
191 if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
192 batadv_tt_global_del_orig_list(tt_global_entry);
193 kfree_rcu(tt_global_entry, common.rcu);
197 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
199 struct batadv_tt_orig_list_entry *orig_entry;
201 orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu);
203 /* We are in an rcu callback here, therefore we cannot use
204 * batadv_orig_node_free_ref() and its call_rcu():
205 * An rcu_barrier() wouldn't wait for that to finish
207 batadv_orig_node_free_ref_now(orig_entry->orig_node);
212 * batadv_tt_local_size_mod - change the size by v of the local table identified
214 * @bat_priv: the bat priv with all the soft interface information
215 * @vid: the VLAN identifier of the sub-table to change
216 * @v: the amount to sum to the local table size
218 static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
219 unsigned short vid, int v)
221 struct batadv_softif_vlan *vlan;
223 vlan = batadv_softif_vlan_get(bat_priv, vid);
227 atomic_add(v, &vlan->tt.num_entries);
229 batadv_softif_vlan_free_ref(vlan);
233 * batadv_tt_local_size_inc - increase by one the local table size for the given
235 * @bat_priv: the bat priv with all the soft interface information
236 * @vid: the VLAN identifier
238 static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv,
241 batadv_tt_local_size_mod(bat_priv, vid, 1);
245 * batadv_tt_local_size_dec - decrease by one the local table size for the given
247 * @bat_priv: the bat priv with all the soft interface information
248 * @vid: the VLAN identifier
250 static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv,
253 batadv_tt_local_size_mod(bat_priv, vid, -1);
257 * batadv_tt_global_size_mod - change the size by v of the local table
259 * @bat_priv: the bat priv with all the soft interface information
260 * @vid: the VLAN identifier
261 * @v: the amount to sum to the global table size
263 static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node,
264 unsigned short vid, int v)
266 struct batadv_orig_node_vlan *vlan;
268 vlan = batadv_orig_node_vlan_new(orig_node, vid);
272 if (atomic_add_return(v, &vlan->tt.num_entries) == 0) {
273 spin_lock_bh(&orig_node->vlan_list_lock);
274 list_del_rcu(&vlan->list);
275 spin_unlock_bh(&orig_node->vlan_list_lock);
276 batadv_orig_node_vlan_free_ref(vlan);
279 batadv_orig_node_vlan_free_ref(vlan);
283 * batadv_tt_global_size_inc - increase by one the global table size for the
285 * @orig_node: the originator which global table size has to be decreased
286 * @vid: the vlan identifier
288 static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
291 batadv_tt_global_size_mod(orig_node, vid, 1);
295 * batadv_tt_global_size_dec - decrease by one the global table size for the
297 * @orig_node: the originator which global table size has to be decreased
298 * @vid: the vlan identifier
300 static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
303 batadv_tt_global_size_mod(orig_node, vid, -1);
307 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry)
309 if (!atomic_dec_and_test(&orig_entry->refcount))
312 call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
316 * batadv_tt_local_event - store a local TT event (ADD/DEL)
317 * @bat_priv: the bat priv with all the soft interface information
318 * @tt_local_entry: the TT entry involved in the event
319 * @event_flags: flags to store in the event structure
321 static void batadv_tt_local_event(struct batadv_priv *bat_priv,
322 struct batadv_tt_local_entry *tt_local_entry,
325 struct batadv_tt_change_node *tt_change_node, *entry, *safe;
326 struct batadv_tt_common_entry *common = &tt_local_entry->common;
327 uint8_t flags = common->flags | event_flags;
328 bool event_removed = false;
329 bool del_op_requested, del_op_entry;
331 tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
335 tt_change_node->change.flags = flags;
336 memset(tt_change_node->change.reserved, 0,
337 sizeof(tt_change_node->change.reserved));
338 memcpy(tt_change_node->change.addr, common->addr, ETH_ALEN);
339 tt_change_node->change.vid = htons(common->vid);
341 del_op_requested = flags & BATADV_TT_CLIENT_DEL;
343 /* check for ADD+DEL or DEL+ADD events */
344 spin_lock_bh(&bat_priv->tt.changes_list_lock);
345 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
347 if (!batadv_compare_eth(entry->change.addr, common->addr))
350 /* DEL+ADD in the same orig interval have no effect and can be
351 * removed to avoid silly behaviour on the receiver side. The
352 * other way around (ADD+DEL) can happen in case of roaming of
353 * a client still in the NEW state. Roaming of NEW clients is
354 * now possible due to automatically recognition of "temporary"
357 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
358 if (!del_op_requested && del_op_entry)
360 if (del_op_requested && !del_op_entry)
363 /* this is a second add in the same originator interval. It
364 * means that flags have been changed: update them!
366 if (!del_op_requested && !del_op_entry)
367 entry->change.flags = flags;
371 list_del(&entry->list);
373 kfree(tt_change_node);
374 event_removed = true;
378 /* track the change in the OGMinterval list */
379 list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
382 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
385 atomic_dec(&bat_priv->tt.local_changes);
387 atomic_inc(&bat_priv->tt.local_changes);
391 * batadv_tt_len - compute length in bytes of given number of tt changes
392 * @changes_num: number of tt changes
394 * Returns computed length in bytes.
396 static int batadv_tt_len(int changes_num)
398 return changes_num * sizeof(struct batadv_tvlv_tt_change);
402 * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
403 * @tt_len: available space
405 * Returns the number of entries.
407 static uint16_t batadv_tt_entries(uint16_t tt_len)
409 return tt_len / batadv_tt_len(1);
413 * batadv_tt_local_table_transmit_size - calculates the local translation table
414 * size when transmitted over the air
415 * @bat_priv: the bat priv with all the soft interface information
417 * Returns local translation table size in bytes.
419 static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
421 uint16_t num_vlan = 0, tt_local_entries = 0;
422 struct batadv_softif_vlan *vlan;
426 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
428 tt_local_entries += atomic_read(&vlan->tt.num_entries);
432 /* header size of tvlv encapsulated tt response payload */
433 hdr_size = sizeof(struct batadv_unicast_tvlv_packet);
434 hdr_size += sizeof(struct batadv_tvlv_hdr);
435 hdr_size += sizeof(struct batadv_tvlv_tt_data);
436 hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data);
438 return hdr_size + batadv_tt_len(tt_local_entries);
441 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
443 if (bat_priv->tt.local_hash)
446 bat_priv->tt.local_hash = batadv_hash_new(1024);
448 if (!bat_priv->tt.local_hash)
451 batadv_hash_set_lock_class(bat_priv->tt.local_hash,
452 &batadv_tt_local_hash_lock_class_key);
457 static void batadv_tt_global_free(struct batadv_priv *bat_priv,
458 struct batadv_tt_global_entry *tt_global,
461 batadv_dbg(BATADV_DBG_TT, bat_priv,
462 "Deleting global tt entry %pM (vid: %d): %s\n",
463 tt_global->common.addr,
464 BATADV_PRINT_VID(tt_global->common.vid), message);
466 batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
467 batadv_choose_tt, &tt_global->common);
468 batadv_tt_global_entry_free_ref(tt_global);
472 * batadv_tt_local_add - add a new client to the local table or update an
474 * @soft_iface: netdev struct of the mesh interface
475 * @addr: the mac address of the client to add
476 * @vid: VLAN identifier
477 * @ifindex: index of the interface where the client is connected to (useful to
478 * identify wireless clients)
480 * Returns true if the client was successfully added, false otherwise.
482 bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
483 unsigned short vid, int ifindex)
485 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
486 struct batadv_tt_local_entry *tt_local;
487 struct batadv_tt_global_entry *tt_global;
488 struct net_device *in_dev = NULL;
489 struct hlist_head *head;
490 struct batadv_tt_orig_list_entry *orig_entry;
491 int hash_added, table_size, packet_size_max;
492 bool ret = false, roamed_back = false;
493 uint8_t remote_flags;
495 if (ifindex != BATADV_NULL_IFINDEX)
496 in_dev = dev_get_by_index(&init_net, ifindex);
498 tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
499 tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
502 tt_local->last_seen = jiffies;
503 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
504 batadv_dbg(BATADV_DBG_TT, bat_priv,
505 "Re-adding pending client %pM (vid: %d)\n",
506 addr, BATADV_PRINT_VID(vid));
507 /* whatever the reason why the PENDING flag was set,
508 * this is a client which was enqueued to be removed in
509 * this orig_interval. Since it popped up again, the
510 * flag can be reset like it was never enqueued
512 tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
516 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
517 batadv_dbg(BATADV_DBG_TT, bat_priv,
518 "Roaming client %pM (vid: %d) came back to its original location\n",
519 addr, BATADV_PRINT_VID(vid));
520 /* the ROAM flag is set because this client roamed away
521 * and the node got a roaming_advertisement message. Now
522 * that the client popped up again at its original
523 * location such flag can be unset
525 tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
531 /* Ignore the client if we cannot send it in a full table response. */
532 table_size = batadv_tt_local_table_transmit_size(bat_priv);
533 table_size += batadv_tt_len(1);
534 packet_size_max = atomic_read(&bat_priv->packet_size_max);
535 if (table_size > packet_size_max) {
536 net_ratelimited_function(batadv_info, soft_iface,
537 "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
538 table_size, packet_size_max, addr);
542 tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC);
546 batadv_dbg(BATADV_DBG_TT, bat_priv,
547 "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
548 addr, BATADV_PRINT_VID(vid),
549 (uint8_t)atomic_read(&bat_priv->tt.vn));
551 memcpy(tt_local->common.addr, addr, ETH_ALEN);
552 /* The local entry has to be marked as NEW to avoid to send it in
553 * a full table response going out before the next ttvn increment
554 * (consistency check)
556 tt_local->common.flags = BATADV_TT_CLIENT_NEW;
557 tt_local->common.vid = vid;
558 if (batadv_is_wifi_netdev(in_dev))
559 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
560 atomic_set(&tt_local->common.refcount, 2);
561 tt_local->last_seen = jiffies;
562 tt_local->common.added_at = tt_local->last_seen;
564 /* the batman interface mac address should never be purged */
565 if (batadv_compare_eth(addr, soft_iface->dev_addr))
566 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
568 hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
569 batadv_choose_tt, &tt_local->common,
570 &tt_local->common.hash_entry);
572 if (unlikely(hash_added != 0)) {
573 /* remove the reference for the hash */
574 batadv_tt_local_entry_free_ref(tt_local);
579 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
582 /* Check whether it is a roaming, but don't do anything if the roaming
583 * process has already been handled
585 if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
586 /* These node are probably going to update their tt table */
587 head = &tt_global->orig_list;
589 hlist_for_each_entry_rcu(orig_entry, head, list) {
590 batadv_send_roam_adv(bat_priv, tt_global->common.addr,
591 tt_global->common.vid,
592 orig_entry->orig_node);
596 batadv_tt_global_free(bat_priv, tt_global,
600 /* The global entry has to be marked as ROAMING and
601 * has to be kept for consistency purpose
603 tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
604 tt_global->roam_at = jiffies;
608 /* store the current remote flags before altering them. This helps
609 * understanding is flags are changing or not
611 remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK;
613 if (batadv_is_wifi_netdev(in_dev))
614 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
616 tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI;
618 /* if any "dynamic" flag has been modified, resend an ADD event for this
619 * entry so that all the nodes can get the new flags
621 if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
622 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
629 batadv_tt_local_entry_free_ref(tt_local);
631 batadv_tt_global_entry_free_ref(tt_global);
636 * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
637 * within a TT Response directed to another node
638 * @orig_node: originator for which the TT data has to be prepared
639 * @tt_data: uninitialised pointer to the address of the TVLV buffer
640 * @tt_change: uninitialised pointer to the address of the area where the TT
641 * changed can be stored
642 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
643 * function reserves the amount of space needed to send the entire global TT
644 * table. In case of success the value is updated with the real amount of
647 * Allocate the needed amount of memory for the entire TT TVLV and write its
648 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
649 * objects, one per active VLAN served by the originator node.
651 * Return the size of the allocated buffer or 0 in case of failure.
654 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
655 struct batadv_tvlv_tt_data **tt_data,
656 struct batadv_tvlv_tt_change **tt_change,
659 uint16_t num_vlan = 0, num_entries = 0, change_offset, tvlv_len;
660 struct batadv_tvlv_tt_vlan_data *tt_vlan;
661 struct batadv_orig_node_vlan *vlan;
662 uint8_t *tt_change_ptr;
665 list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
667 num_entries += atomic_read(&vlan->tt.num_entries);
670 change_offset = sizeof(**tt_data);
671 change_offset += num_vlan * sizeof(*tt_vlan);
673 /* if tt_len is negative, allocate the space needed by the full table */
675 *tt_len = batadv_tt_len(num_entries);
678 tvlv_len += change_offset;
680 *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
686 (*tt_data)->flags = BATADV_NO_FLAGS;
687 (*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
688 (*tt_data)->num_vlan = htons(num_vlan);
690 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
691 list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
692 tt_vlan->vid = htons(vlan->vid);
693 tt_vlan->crc = htonl(vlan->tt.crc);
698 tt_change_ptr = (uint8_t *)*tt_data + change_offset;
699 *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
707 * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
709 * @bat_priv: the bat priv with all the soft interface information
710 * @tt_data: uninitialised pointer to the address of the TVLV buffer
711 * @tt_change: uninitialised pointer to the address of the area where the TT
712 * changes can be stored
713 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
714 * function reserves the amount of space needed to send the entire local TT
715 * table. In case of success the value is updated with the real amount of
718 * Allocate the needed amount of memory for the entire TT TVLV and write its
719 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
720 * objects, one per active VLAN.
722 * Return the size of the allocated buffer or 0 in case of failure.
725 batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
726 struct batadv_tvlv_tt_data **tt_data,
727 struct batadv_tvlv_tt_change **tt_change,
730 struct batadv_tvlv_tt_vlan_data *tt_vlan;
731 struct batadv_softif_vlan *vlan;
732 uint16_t num_vlan = 0, num_entries = 0, tvlv_len;
733 uint8_t *tt_change_ptr;
737 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
739 num_entries += atomic_read(&vlan->tt.num_entries);
742 change_offset = sizeof(**tt_data);
743 change_offset += num_vlan * sizeof(*tt_vlan);
745 /* if tt_len is negative, allocate the space needed by the full table */
747 *tt_len = batadv_tt_len(num_entries);
750 tvlv_len += change_offset;
752 *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
758 (*tt_data)->flags = BATADV_NO_FLAGS;
759 (*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
760 (*tt_data)->num_vlan = htons(num_vlan);
762 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
763 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
764 tt_vlan->vid = htons(vlan->vid);
765 tt_vlan->crc = htonl(vlan->tt.crc);
770 tt_change_ptr = (uint8_t *)*tt_data + change_offset;
771 *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
779 * batadv_tt_tvlv_container_update - update the translation table tvlv container
780 * after local tt changes have been committed
781 * @bat_priv: the bat priv with all the soft interface information
783 static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
785 struct batadv_tt_change_node *entry, *safe;
786 struct batadv_tvlv_tt_data *tt_data;
787 struct batadv_tvlv_tt_change *tt_change;
788 int tt_diff_len, tt_change_len = 0;
789 int tt_diff_entries_num = 0, tt_diff_entries_count = 0;
792 tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
793 tt_diff_len = batadv_tt_len(tt_diff_entries_num);
795 /* if we have too many changes for one packet don't send any
796 * and wait for the tt table request which will be fragmented
798 if (tt_diff_len > bat_priv->soft_iface->mtu)
801 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
802 &tt_change, &tt_diff_len);
806 tt_data->flags = BATADV_TT_OGM_DIFF;
808 if (tt_diff_len == 0)
809 goto container_register;
811 spin_lock_bh(&bat_priv->tt.changes_list_lock);
812 atomic_set(&bat_priv->tt.local_changes, 0);
814 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
816 if (tt_diff_entries_count < tt_diff_entries_num) {
817 memcpy(tt_change + tt_diff_entries_count,
819 sizeof(struct batadv_tvlv_tt_change));
820 tt_diff_entries_count++;
822 list_del(&entry->list);
825 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
827 /* Keep the buffer for possible tt_request */
828 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
829 kfree(bat_priv->tt.last_changeset);
830 bat_priv->tt.last_changeset_len = 0;
831 bat_priv->tt.last_changeset = NULL;
832 tt_change_len = batadv_tt_len(tt_diff_entries_count);
833 /* check whether this new OGM has no changes due to size problems */
834 if (tt_diff_entries_count > 0) {
835 /* if kmalloc() fails we will reply with the full table
836 * instead of providing the diff
838 bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
839 if (bat_priv->tt.last_changeset) {
840 memcpy(bat_priv->tt.last_changeset,
841 tt_change, tt_change_len);
842 bat_priv->tt.last_changeset_len = tt_diff_len;
845 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
848 batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
853 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
855 struct net_device *net_dev = (struct net_device *)seq->private;
856 struct batadv_priv *bat_priv = netdev_priv(net_dev);
857 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
858 struct batadv_tt_common_entry *tt_common_entry;
859 struct batadv_tt_local_entry *tt_local;
860 struct batadv_hard_iface *primary_if;
861 struct batadv_softif_vlan *vlan;
862 struct hlist_head *head;
867 unsigned long last_seen_jiffies;
869 uint16_t np_flag = BATADV_TT_CLIENT_NOPURGE;
871 primary_if = batadv_seq_print_text_primary_if_get(seq);
876 "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
877 net_dev->name, (uint8_t)atomic_read(&bat_priv->tt.vn));
878 seq_printf(seq, " %-13s %s %-7s %-9s (%-10s)\n", "Client", "VID",
879 "Flags", "Last seen", "CRC");
881 for (i = 0; i < hash->size; i++) {
882 head = &hash->table[i];
885 hlist_for_each_entry_rcu(tt_common_entry,
887 tt_local = container_of(tt_common_entry,
888 struct batadv_tt_local_entry,
890 vid = tt_common_entry->vid;
891 last_seen_jiffies = jiffies - tt_local->last_seen;
892 last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
893 last_seen_secs = last_seen_msecs / 1000;
894 last_seen_msecs = last_seen_msecs % 1000;
896 no_purge = tt_common_entry->flags & np_flag;
898 vlan = batadv_softif_vlan_get(bat_priv, vid);
900 seq_printf(seq, "Cannot retrieve VLAN %d\n",
901 BATADV_PRINT_VID(vid));
906 " * %pM %4i [%c%c%c%c%c] %3u.%03u (%#.8x)\n",
907 tt_common_entry->addr,
908 BATADV_PRINT_VID(tt_common_entry->vid),
909 (tt_common_entry->flags &
910 BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
911 no_purge ? 'P' : '.',
912 (tt_common_entry->flags &
913 BATADV_TT_CLIENT_NEW ? 'N' : '.'),
914 (tt_common_entry->flags &
915 BATADV_TT_CLIENT_PENDING ? 'X' : '.'),
916 (tt_common_entry->flags &
917 BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
918 no_purge ? 0 : last_seen_secs,
919 no_purge ? 0 : last_seen_msecs,
922 batadv_softif_vlan_free_ref(vlan);
928 batadv_hardif_free_ref(primary_if);
933 batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
934 struct batadv_tt_local_entry *tt_local_entry,
935 uint16_t flags, const char *message)
937 batadv_tt_local_event(bat_priv, tt_local_entry, flags);
939 /* The local client has to be marked as "pending to be removed" but has
940 * to be kept in the table in order to send it in a full table
941 * response issued before the net ttvn increment (consistency check)
943 tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
945 batadv_dbg(BATADV_DBG_TT, bat_priv,
946 "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
947 tt_local_entry->common.addr,
948 BATADV_PRINT_VID(tt_local_entry->common.vid), message);
952 * batadv_tt_local_remove - logically remove an entry from the local table
953 * @bat_priv: the bat priv with all the soft interface information
954 * @addr: the MAC address of the client to remove
955 * @vid: VLAN identifier
956 * @message: message to append to the log on deletion
957 * @roaming: true if the deletion is due to a roaming event
959 * Returns the flags assigned to the local entry before being deleted
961 uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv,
962 const uint8_t *addr, unsigned short vid,
963 const char *message, bool roaming)
965 struct batadv_tt_local_entry *tt_local_entry;
966 uint16_t flags, curr_flags = BATADV_NO_FLAGS;
968 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
972 curr_flags = tt_local_entry->common.flags;
974 flags = BATADV_TT_CLIENT_DEL;
975 /* if this global entry addition is due to a roaming, the node has to
976 * mark the local entry as "roamed" in order to correctly reroute
980 flags |= BATADV_TT_CLIENT_ROAM;
981 /* mark the local client as ROAMed */
982 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
985 if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
986 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
990 /* if this client has been added right now, it is possible to
991 * immediately purge it
993 batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL);
994 hlist_del_rcu(&tt_local_entry->common.hash_entry);
995 batadv_tt_local_entry_free_ref(tt_local_entry);
999 batadv_tt_local_entry_free_ref(tt_local_entry);
1005 * batadv_tt_local_purge_list - purge inactive tt local entries
1006 * @bat_priv: the bat priv with all the soft interface information
1007 * @head: pointer to the list containing the local tt entries
1008 * @timeout: parameter deciding whether a given tt local entry is considered
1011 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
1012 struct hlist_head *head,
1015 struct batadv_tt_local_entry *tt_local_entry;
1016 struct batadv_tt_common_entry *tt_common_entry;
1017 struct hlist_node *node_tmp;
1019 hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
1021 tt_local_entry = container_of(tt_common_entry,
1022 struct batadv_tt_local_entry,
1024 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
1027 /* entry already marked for deletion */
1028 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
1031 if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout))
1034 batadv_tt_local_set_pending(bat_priv, tt_local_entry,
1035 BATADV_TT_CLIENT_DEL, "timed out");
1040 * batadv_tt_local_purge - purge inactive tt local entries
1041 * @bat_priv: the bat priv with all the soft interface information
1042 * @timeout: parameter deciding whether a given tt local entry is considered
1045 static void batadv_tt_local_purge(struct batadv_priv *bat_priv,
1048 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1049 struct hlist_head *head;
1050 spinlock_t *list_lock; /* protects write access to the hash lists */
1053 for (i = 0; i < hash->size; i++) {
1054 head = &hash->table[i];
1055 list_lock = &hash->list_locks[i];
1057 spin_lock_bh(list_lock);
1058 batadv_tt_local_purge_list(bat_priv, head, timeout);
1059 spin_unlock_bh(list_lock);
1063 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
1065 struct batadv_hashtable *hash;
1066 spinlock_t *list_lock; /* protects write access to the hash lists */
1067 struct batadv_tt_common_entry *tt_common_entry;
1068 struct batadv_tt_local_entry *tt_local;
1069 struct hlist_node *node_tmp;
1070 struct hlist_head *head;
1073 if (!bat_priv->tt.local_hash)
1076 hash = bat_priv->tt.local_hash;
1078 for (i = 0; i < hash->size; i++) {
1079 head = &hash->table[i];
1080 list_lock = &hash->list_locks[i];
1082 spin_lock_bh(list_lock);
1083 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1085 hlist_del_rcu(&tt_common_entry->hash_entry);
1086 tt_local = container_of(tt_common_entry,
1087 struct batadv_tt_local_entry,
1089 batadv_tt_local_entry_free_ref(tt_local);
1091 spin_unlock_bh(list_lock);
1094 batadv_hash_destroy(hash);
1096 bat_priv->tt.local_hash = NULL;
1099 static int batadv_tt_global_init(struct batadv_priv *bat_priv)
1101 if (bat_priv->tt.global_hash)
1104 bat_priv->tt.global_hash = batadv_hash_new(1024);
1106 if (!bat_priv->tt.global_hash)
1109 batadv_hash_set_lock_class(bat_priv->tt.global_hash,
1110 &batadv_tt_global_hash_lock_class_key);
1115 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
1117 struct batadv_tt_change_node *entry, *safe;
1119 spin_lock_bh(&bat_priv->tt.changes_list_lock);
1121 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1123 list_del(&entry->list);
1127 atomic_set(&bat_priv->tt.local_changes, 0);
1128 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1131 /* retrieves the orig_tt_list_entry belonging to orig_node from the
1132 * batadv_tt_global_entry list
1134 * returns it with an increased refcounter, NULL if not found
1136 static struct batadv_tt_orig_list_entry *
1137 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
1138 const struct batadv_orig_node *orig_node)
1140 struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
1141 const struct hlist_head *head;
1144 head = &entry->orig_list;
1145 hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
1146 if (tmp_orig_entry->orig_node != orig_node)
1148 if (!atomic_inc_not_zero(&tmp_orig_entry->refcount))
1151 orig_entry = tmp_orig_entry;
1159 /* find out if an orig_node is already in the list of a tt_global_entry.
1160 * returns true if found, false otherwise
1163 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
1164 const struct batadv_orig_node *orig_node)
1166 struct batadv_tt_orig_list_entry *orig_entry;
1169 orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
1172 batadv_tt_orig_list_entry_free_ref(orig_entry);
1179 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
1180 struct batadv_orig_node *orig_node, int ttvn)
1182 struct batadv_tt_orig_list_entry *orig_entry;
1184 orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
1186 /* refresh the ttvn: the current value could be a bogus one that
1187 * was added during a "temporary client detection"
1189 orig_entry->ttvn = ttvn;
1193 orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
1197 INIT_HLIST_NODE(&orig_entry->list);
1198 atomic_inc(&orig_node->refcount);
1199 batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
1200 orig_entry->orig_node = orig_node;
1201 orig_entry->ttvn = ttvn;
1202 atomic_set(&orig_entry->refcount, 2);
1204 spin_lock_bh(&tt_global->list_lock);
1205 hlist_add_head_rcu(&orig_entry->list,
1206 &tt_global->orig_list);
1207 spin_unlock_bh(&tt_global->list_lock);
1210 batadv_tt_orig_list_entry_free_ref(orig_entry);
1214 * batadv_tt_global_add - add a new TT global entry or update an existing one
1215 * @bat_priv: the bat priv with all the soft interface information
1216 * @orig_node: the originator announcing the client
1217 * @tt_addr: the mac address of the non-mesh client
1218 * @vid: VLAN identifier
1219 * @flags: TT flags that have to be set for this non-mesh client
1220 * @ttvn: the tt version number ever announcing this non-mesh client
1222 * Add a new TT global entry for the given originator. If the entry already
1223 * exists add a new reference to the given originator (a global entry can have
1224 * references to multiple originators) and adjust the flags attribute to reflect
1225 * the function argument.
1226 * If a TT local entry exists for this non-mesh client remove it.
1228 * The caller must hold orig_node refcount.
1230 * Return true if the new entry has been added, false otherwise
1232 static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
1233 struct batadv_orig_node *orig_node,
1234 const unsigned char *tt_addr,
1235 unsigned short vid, uint16_t flags,
1238 struct batadv_tt_global_entry *tt_global_entry;
1239 struct batadv_tt_local_entry *tt_local_entry;
1242 struct batadv_tt_common_entry *common;
1243 uint16_t local_flags;
1245 /* ignore global entries from backbone nodes */
1246 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
1249 tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
1250 tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
1252 /* if the node already has a local client for this entry, it has to wait
1253 * for a roaming advertisement instead of manually messing up the global
1256 if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
1257 !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
1260 if (!tt_global_entry) {
1261 tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
1262 if (!tt_global_entry)
1265 common = &tt_global_entry->common;
1266 memcpy(common->addr, tt_addr, ETH_ALEN);
1269 common->flags = flags;
1270 tt_global_entry->roam_at = 0;
1271 /* node must store current time in case of roaming. This is
1272 * needed to purge this entry out on timeout (if nobody claims
1275 if (flags & BATADV_TT_CLIENT_ROAM)
1276 tt_global_entry->roam_at = jiffies;
1277 atomic_set(&common->refcount, 2);
1278 common->added_at = jiffies;
1280 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
1281 spin_lock_init(&tt_global_entry->list_lock);
1283 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
1285 batadv_choose_tt, common,
1286 &common->hash_entry);
1288 if (unlikely(hash_added != 0)) {
1289 /* remove the reference for the hash */
1290 batadv_tt_global_entry_free_ref(tt_global_entry);
1294 common = &tt_global_entry->common;
1295 /* If there is already a global entry, we can use this one for
1297 * But if we are trying to add a temporary client then here are
1298 * two options at this point:
1299 * 1) the global client is not a temporary client: the global
1300 * client has to be left as it is, temporary information
1301 * should never override any already known client state
1302 * 2) the global client is a temporary client: purge the
1303 * originator list and add the new one orig_entry
1305 if (flags & BATADV_TT_CLIENT_TEMP) {
1306 if (!(common->flags & BATADV_TT_CLIENT_TEMP))
1308 if (batadv_tt_global_entry_has_orig(tt_global_entry,
1311 batadv_tt_global_del_orig_list(tt_global_entry);
1312 goto add_orig_entry;
1315 /* if the client was temporary added before receiving the first
1316 * OGM announcing it, we have to clear the TEMP flag
1318 common->flags &= ~BATADV_TT_CLIENT_TEMP;
1320 /* the change can carry possible "attribute" flags like the
1321 * TT_CLIENT_WIFI, therefore they have to be copied in the
1324 tt_global_entry->common.flags |= flags;
1326 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1327 * one originator left in the list and we previously received a
1328 * delete + roaming change for this originator.
1330 * We should first delete the old originator before adding the
1333 if (common->flags & BATADV_TT_CLIENT_ROAM) {
1334 batadv_tt_global_del_orig_list(tt_global_entry);
1335 common->flags &= ~BATADV_TT_CLIENT_ROAM;
1336 tt_global_entry->roam_at = 0;
1340 /* add the new orig_entry (if needed) or update it */
1341 batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);
1343 batadv_dbg(BATADV_DBG_TT, bat_priv,
1344 "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1345 common->addr, BATADV_PRINT_VID(common->vid),
1351 /* remove address from local hash if present */
1352 local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
1353 "global tt received",
1354 flags & BATADV_TT_CLIENT_ROAM);
1355 tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
1357 if (!(flags & BATADV_TT_CLIENT_ROAM))
1358 /* this is a normal global add. Therefore the client is not in a
1359 * roaming state anymore.
1361 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
1364 if (tt_global_entry)
1365 batadv_tt_global_entry_free_ref(tt_global_entry);
1367 batadv_tt_local_entry_free_ref(tt_local_entry);
1371 /* batadv_transtable_best_orig - Get best originator list entry from tt entry
1372 * @bat_priv: the bat priv with all the soft interface information
1373 * @tt_global_entry: global translation table entry to be analyzed
1375 * This functon assumes the caller holds rcu_read_lock().
1376 * Returns best originator list entry or NULL on errors.
1378 static struct batadv_tt_orig_list_entry *
1379 batadv_transtable_best_orig(struct batadv_priv *bat_priv,
1380 struct batadv_tt_global_entry *tt_global_entry)
1382 struct batadv_neigh_node *router, *best_router = NULL;
1383 struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1384 struct hlist_head *head;
1385 struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
1387 head = &tt_global_entry->orig_list;
1388 hlist_for_each_entry_rcu(orig_entry, head, list) {
1389 router = batadv_orig_node_get_router(orig_entry->orig_node);
1394 bao->bat_neigh_cmp(router, best_router) <= 0) {
1395 batadv_neigh_node_free_ref(router);
1399 /* release the refcount for the "old" best */
1401 batadv_neigh_node_free_ref(best_router);
1403 best_entry = orig_entry;
1404 best_router = router;
1408 batadv_neigh_node_free_ref(best_router);
1413 /* batadv_tt_global_print_entry - print all orig nodes who announce the address
1414 * for this global entry
1415 * @bat_priv: the bat priv with all the soft interface information
1416 * @tt_global_entry: global translation table entry to be printed
1417 * @seq: debugfs table seq_file struct
1419 * This functon assumes the caller holds rcu_read_lock().
1422 batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
1423 struct batadv_tt_global_entry *tt_global_entry,
1424 struct seq_file *seq)
1426 struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
1427 struct batadv_tt_common_entry *tt_common_entry;
1428 struct batadv_orig_node_vlan *vlan;
1429 struct hlist_head *head;
1433 tt_common_entry = &tt_global_entry->common;
1434 flags = tt_common_entry->flags;
1436 best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1438 vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
1439 tt_common_entry->vid);
1442 " * Cannot retrieve VLAN %d for originator %pM\n",
1443 BATADV_PRINT_VID(tt_common_entry->vid),
1444 best_entry->orig_node->orig);
1448 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
1450 " %c %pM %4i (%3u) via %pM (%3u) (%#.8x) [%c%c%c]\n",
1451 '*', tt_global_entry->common.addr,
1452 BATADV_PRINT_VID(tt_global_entry->common.vid),
1453 best_entry->ttvn, best_entry->orig_node->orig,
1454 last_ttvn, vlan->tt.crc,
1455 (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
1456 (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
1457 (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.'));
1459 batadv_orig_node_vlan_free_ref(vlan);
1463 head = &tt_global_entry->orig_list;
1465 hlist_for_each_entry_rcu(orig_entry, head, list) {
1466 if (best_entry == orig_entry)
1469 vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
1470 tt_common_entry->vid);
1473 " + Cannot retrieve VLAN %d for originator %pM\n",
1474 BATADV_PRINT_VID(tt_common_entry->vid),
1475 orig_entry->orig_node->orig);
1479 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
1481 " %c %pM %4d (%3u) via %pM (%3u) (%#.8x) [%c%c%c]\n",
1482 '+', tt_global_entry->common.addr,
1483 BATADV_PRINT_VID(tt_global_entry->common.vid),
1484 orig_entry->ttvn, orig_entry->orig_node->orig,
1485 last_ttvn, vlan->tt.crc,
1486 (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
1487 (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
1488 (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.'));
1490 batadv_orig_node_vlan_free_ref(vlan);
1494 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
1496 struct net_device *net_dev = (struct net_device *)seq->private;
1497 struct batadv_priv *bat_priv = netdev_priv(net_dev);
1498 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1499 struct batadv_tt_common_entry *tt_common_entry;
1500 struct batadv_tt_global_entry *tt_global;
1501 struct batadv_hard_iface *primary_if;
1502 struct hlist_head *head;
1505 primary_if = batadv_seq_print_text_primary_if_get(seq);
1510 "Globally announced TT entries received via the mesh %s\n",
1512 seq_printf(seq, " %-13s %s %s %-15s %s (%-10s) %s\n",
1513 "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1516 for (i = 0; i < hash->size; i++) {
1517 head = &hash->table[i];
1520 hlist_for_each_entry_rcu(tt_common_entry,
1522 tt_global = container_of(tt_common_entry,
1523 struct batadv_tt_global_entry,
1525 batadv_tt_global_print_entry(bat_priv, tt_global, seq);
1531 batadv_hardif_free_ref(primary_if);
1535 /* deletes the orig list of a tt_global_entry */
1537 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
1539 struct hlist_head *head;
1540 struct hlist_node *safe;
1541 struct batadv_tt_orig_list_entry *orig_entry;
1543 spin_lock_bh(&tt_global_entry->list_lock);
1544 head = &tt_global_entry->orig_list;
1545 hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1546 hlist_del_rcu(&orig_entry->list);
1547 batadv_tt_global_size_dec(orig_entry->orig_node,
1548 tt_global_entry->common.vid);
1549 batadv_tt_orig_list_entry_free_ref(orig_entry);
1551 spin_unlock_bh(&tt_global_entry->list_lock);
1555 batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv,
1556 struct batadv_tt_global_entry *tt_global_entry,
1557 struct batadv_orig_node *orig_node,
1558 const char *message)
1560 struct hlist_head *head;
1561 struct hlist_node *safe;
1562 struct batadv_tt_orig_list_entry *orig_entry;
1565 spin_lock_bh(&tt_global_entry->list_lock);
1566 head = &tt_global_entry->orig_list;
1567 hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1568 if (orig_entry->orig_node == orig_node) {
1569 vid = tt_global_entry->common.vid;
1570 batadv_dbg(BATADV_DBG_TT, bat_priv,
1571 "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1573 tt_global_entry->common.addr,
1574 BATADV_PRINT_VID(vid), message);
1575 hlist_del_rcu(&orig_entry->list);
1576 batadv_tt_global_size_dec(orig_node,
1577 tt_global_entry->common.vid);
1578 batadv_tt_orig_list_entry_free_ref(orig_entry);
1581 spin_unlock_bh(&tt_global_entry->list_lock);
1584 /* If the client is to be deleted, we check if it is the last origantor entry
1585 * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1586 * timer, otherwise we simply remove the originator scheduled for deletion.
1589 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
1590 struct batadv_tt_global_entry *tt_global_entry,
1591 struct batadv_orig_node *orig_node,
1592 const char *message)
1594 bool last_entry = true;
1595 struct hlist_head *head;
1596 struct batadv_tt_orig_list_entry *orig_entry;
1598 /* no local entry exists, case 1:
1599 * Check if this is the last one or if other entries exist.
1603 head = &tt_global_entry->orig_list;
1604 hlist_for_each_entry_rcu(orig_entry, head, list) {
1605 if (orig_entry->orig_node != orig_node) {
1613 /* its the last one, mark for roaming. */
1614 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1615 tt_global_entry->roam_at = jiffies;
1617 /* there is another entry, we can simply delete this
1618 * one and can still use the other one.
1620 batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
1621 orig_node, message);
1625 * batadv_tt_global_del - remove a client from the global table
1626 * @bat_priv: the bat priv with all the soft interface information
1627 * @orig_node: an originator serving this client
1628 * @addr: the mac address of the client
1629 * @vid: VLAN identifier
1630 * @message: a message explaining the reason for deleting the client to print
1631 * for debugging purpose
1632 * @roaming: true if the deletion has been triggered by a roaming event
1634 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
1635 struct batadv_orig_node *orig_node,
1636 const unsigned char *addr, unsigned short vid,
1637 const char *message, bool roaming)
1639 struct batadv_tt_global_entry *tt_global_entry;
1640 struct batadv_tt_local_entry *local_entry = NULL;
1642 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1643 if (!tt_global_entry)
1647 batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
1648 orig_node, message);
1650 if (hlist_empty(&tt_global_entry->orig_list))
1651 batadv_tt_global_free(bat_priv, tt_global_entry,
1657 /* if we are deleting a global entry due to a roam
1658 * event, there are two possibilities:
1659 * 1) the client roamed from node A to node B => if there
1660 * is only one originator left for this client, we mark
1661 * it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1662 * wait for node B to claim it. In case of timeout
1663 * the entry is purged.
1665 * If there are other originators left, we directly delete
1667 * 2) the client roamed to us => we can directly delete
1668 * the global entry, since it is useless now.
1670 local_entry = batadv_tt_local_hash_find(bat_priv,
1671 tt_global_entry->common.addr,
1674 /* local entry exists, case 2: client roamed to us. */
1675 batadv_tt_global_del_orig_list(tt_global_entry);
1676 batadv_tt_global_free(bat_priv, tt_global_entry, message);
1678 /* no local entry exists, case 1: check for roaming */
1679 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
1680 orig_node, message);
1684 if (tt_global_entry)
1685 batadv_tt_global_entry_free_ref(tt_global_entry);
1687 batadv_tt_local_entry_free_ref(local_entry);
1691 * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1692 * given originator matching the provided vid
1693 * @bat_priv: the bat priv with all the soft interface information
1694 * @orig_node: the originator owning the entries to remove
1695 * @match_vid: the VLAN identifier to match. If negative all the entries will be
1697 * @message: debug message to print as "reason"
1699 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
1700 struct batadv_orig_node *orig_node,
1702 const char *message)
1704 struct batadv_tt_global_entry *tt_global;
1705 struct batadv_tt_common_entry *tt_common_entry;
1707 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1708 struct hlist_node *safe;
1709 struct hlist_head *head;
1710 spinlock_t *list_lock; /* protects write access to the hash lists */
1716 for (i = 0; i < hash->size; i++) {
1717 head = &hash->table[i];
1718 list_lock = &hash->list_locks[i];
1720 spin_lock_bh(list_lock);
1721 hlist_for_each_entry_safe(tt_common_entry, safe,
1723 /* remove only matching entries */
1724 if (match_vid >= 0 && tt_common_entry->vid != match_vid)
1727 tt_global = container_of(tt_common_entry,
1728 struct batadv_tt_global_entry,
1731 batadv_tt_global_del_orig_entry(bat_priv, tt_global,
1732 orig_node, message);
1734 if (hlist_empty(&tt_global->orig_list)) {
1735 vid = tt_global->common.vid;
1736 batadv_dbg(BATADV_DBG_TT, bat_priv,
1737 "Deleting global tt entry %pM (vid: %d): %s\n",
1738 tt_global->common.addr,
1739 BATADV_PRINT_VID(vid), message);
1740 hlist_del_rcu(&tt_common_entry->hash_entry);
1741 batadv_tt_global_entry_free_ref(tt_global);
1744 spin_unlock_bh(list_lock);
1746 orig_node->tt_initialised = false;
1749 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
1753 unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
1754 unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
1756 if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
1757 batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
1759 *msg = "Roaming timeout\n";
1762 if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
1763 batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
1765 *msg = "Temporary client timeout\n";
1771 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
1773 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1774 struct hlist_head *head;
1775 struct hlist_node *node_tmp;
1776 spinlock_t *list_lock; /* protects write access to the hash lists */
1779 struct batadv_tt_common_entry *tt_common;
1780 struct batadv_tt_global_entry *tt_global;
1782 for (i = 0; i < hash->size; i++) {
1783 head = &hash->table[i];
1784 list_lock = &hash->list_locks[i];
1786 spin_lock_bh(list_lock);
1787 hlist_for_each_entry_safe(tt_common, node_tmp, head,
1789 tt_global = container_of(tt_common,
1790 struct batadv_tt_global_entry,
1793 if (!batadv_tt_global_to_purge(tt_global, &msg))
1796 batadv_dbg(BATADV_DBG_TT, bat_priv,
1797 "Deleting global tt entry %pM (vid: %d): %s\n",
1798 tt_global->common.addr,
1799 BATADV_PRINT_VID(tt_global->common.vid),
1802 hlist_del_rcu(&tt_common->hash_entry);
1804 batadv_tt_global_entry_free_ref(tt_global);
1806 spin_unlock_bh(list_lock);
1810 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
1812 struct batadv_hashtable *hash;
1813 spinlock_t *list_lock; /* protects write access to the hash lists */
1814 struct batadv_tt_common_entry *tt_common_entry;
1815 struct batadv_tt_global_entry *tt_global;
1816 struct hlist_node *node_tmp;
1817 struct hlist_head *head;
1820 if (!bat_priv->tt.global_hash)
1823 hash = bat_priv->tt.global_hash;
1825 for (i = 0; i < hash->size; i++) {
1826 head = &hash->table[i];
1827 list_lock = &hash->list_locks[i];
1829 spin_lock_bh(list_lock);
1830 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1832 hlist_del_rcu(&tt_common_entry->hash_entry);
1833 tt_global = container_of(tt_common_entry,
1834 struct batadv_tt_global_entry,
1836 batadv_tt_global_entry_free_ref(tt_global);
1838 spin_unlock_bh(list_lock);
1841 batadv_hash_destroy(hash);
1843 bat_priv->tt.global_hash = NULL;
1847 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
1848 struct batadv_tt_global_entry *tt_global_entry)
1852 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
1853 tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
1860 * batadv_transtable_search - get the mesh destination for a given client
1861 * @bat_priv: the bat priv with all the soft interface information
1862 * @src: mac address of the source client
1863 * @addr: mac address of the destination client
1864 * @vid: VLAN identifier
1866 * Returns a pointer to the originator that was selected as destination in the
1867 * mesh for contacting the client 'addr', NULL otherwise.
1868 * In case of multiple originators serving the same client, the function returns
1869 * the best one (best in terms of metric towards the destination node).
1871 * If the two clients are AP isolated the function returns NULL.
1873 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
1875 const uint8_t *addr,
1878 struct batadv_tt_local_entry *tt_local_entry = NULL;
1879 struct batadv_tt_global_entry *tt_global_entry = NULL;
1880 struct batadv_orig_node *orig_node = NULL;
1881 struct batadv_tt_orig_list_entry *best_entry;
1882 bool ap_isolation_enabled = false;
1883 struct batadv_softif_vlan *vlan;
1885 /* if the AP isolation is requested on a VLAN, then check for its
1886 * setting in the proper VLAN private data structure
1888 vlan = batadv_softif_vlan_get(bat_priv, vid);
1890 ap_isolation_enabled = atomic_read(&vlan->ap_isolation);
1891 batadv_softif_vlan_free_ref(vlan);
1894 if (src && ap_isolation_enabled) {
1895 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
1896 if (!tt_local_entry ||
1897 (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
1901 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1902 if (!tt_global_entry)
1905 /* check whether the clients should not communicate due to AP
1908 if (tt_local_entry &&
1909 _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
1913 best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1914 /* found anything? */
1916 orig_node = best_entry->orig_node;
1917 if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
1922 if (tt_global_entry)
1923 batadv_tt_global_entry_free_ref(tt_global_entry);
1925 batadv_tt_local_entry_free_ref(tt_local_entry);
1931 * batadv_tt_global_crc - calculates the checksum of the local table belonging
1932 * to the given orig_node
1933 * @bat_priv: the bat priv with all the soft interface information
1934 * @orig_node: originator for which the CRC should be computed
1935 * @vid: VLAN identifier for which the CRC32 has to be computed
1937 * This function computes the checksum for the global table corresponding to a
1938 * specific originator. In particular, the checksum is computed as follows: For
1939 * each client connected to the originator the CRC32C of the MAC address and the
1940 * VID is computed and then all the CRC32Cs of the various clients are xor'ed
1943 * The idea behind is that CRC32C should be used as much as possible in order to
1944 * produce a unique hash of the table, but since the order which is used to feed
1945 * the CRC32C function affects the result and since every node in the network
1946 * probably sorts the clients differently, the hash function cannot be directly
1947 * computed over the entire table. Hence the CRC32C is used only on
1948 * the single client entry, while all the results are then xor'ed together
1949 * because the XOR operation can combine them all while trying to reduce the
1950 * noise as much as possible.
1952 * Returns the checksum of the global table of a given originator.
1954 static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv,
1955 struct batadv_orig_node *orig_node,
1958 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1959 struct batadv_tt_common_entry *tt_common;
1960 struct batadv_tt_global_entry *tt_global;
1961 struct hlist_head *head;
1962 uint32_t i, crc_tmp, crc = 0;
1965 for (i = 0; i < hash->size; i++) {
1966 head = &hash->table[i];
1969 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
1970 tt_global = container_of(tt_common,
1971 struct batadv_tt_global_entry,
1973 /* compute the CRC only for entries belonging to the
1974 * VLAN identified by the vid passed as parameter
1976 if (tt_common->vid != vid)
1979 /* Roaming clients are in the global table for
1980 * consistency only. They don't have to be
1981 * taken into account while computing the
1984 if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
1986 /* Temporary clients have not been announced yet, so
1987 * they have to be skipped while computing the global
1990 if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
1993 /* find out if this global entry is announced by this
1996 if (!batadv_tt_global_entry_has_orig(tt_global,
2000 crc_tmp = crc32c(0, &tt_common->vid,
2001 sizeof(tt_common->vid));
2003 /* compute the CRC on flags that have to be kept in sync
2006 flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2007 crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2009 crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2018 * batadv_tt_local_crc - calculates the checksum of the local table
2019 * @bat_priv: the bat priv with all the soft interface information
2020 * @vid: VLAN identifier for which the CRC32 has to be computed
2022 * For details about the computation, please refer to the documentation for
2023 * batadv_tt_global_crc().
2025 * Returns the checksum of the local table
2027 static uint32_t batadv_tt_local_crc(struct batadv_priv *bat_priv,
2030 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2031 struct batadv_tt_common_entry *tt_common;
2032 struct hlist_head *head;
2033 uint32_t i, crc_tmp, crc = 0;
2036 for (i = 0; i < hash->size; i++) {
2037 head = &hash->table[i];
2040 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2041 /* compute the CRC only for entries belonging to the
2042 * VLAN identified by vid
2044 if (tt_common->vid != vid)
2047 /* not yet committed clients have not to be taken into
2048 * account while computing the CRC
2050 if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2053 crc_tmp = crc32c(0, &tt_common->vid,
2054 sizeof(tt_common->vid));
2056 /* compute the CRC on flags that have to be kept in sync
2059 flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2060 crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2062 crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2070 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2072 struct batadv_tt_req_node *node, *safe;
2074 spin_lock_bh(&bat_priv->tt.req_list_lock);
2076 list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2077 list_del(&node->list);
2081 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2084 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2085 struct batadv_orig_node *orig_node,
2086 const void *tt_buff,
2087 uint16_t tt_buff_len)
2089 /* Replace the old buffer only if I received something in the
2090 * last OGM (the OGM could carry no changes)
2092 spin_lock_bh(&orig_node->tt_buff_lock);
2093 if (tt_buff_len > 0) {
2094 kfree(orig_node->tt_buff);
2095 orig_node->tt_buff_len = 0;
2096 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2097 if (orig_node->tt_buff) {
2098 memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2099 orig_node->tt_buff_len = tt_buff_len;
2102 spin_unlock_bh(&orig_node->tt_buff_lock);
2105 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2107 struct batadv_tt_req_node *node, *safe;
2109 spin_lock_bh(&bat_priv->tt.req_list_lock);
2110 list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2111 if (batadv_has_timed_out(node->issued_at,
2112 BATADV_TT_REQUEST_TIMEOUT)) {
2113 list_del(&node->list);
2117 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2120 /* returns the pointer to the new tt_req_node struct if no request
2121 * has already been issued for this orig_node, NULL otherwise
2123 static struct batadv_tt_req_node *
2124 batadv_new_tt_req_node(struct batadv_priv *bat_priv,
2125 struct batadv_orig_node *orig_node)
2127 struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2129 spin_lock_bh(&bat_priv->tt.req_list_lock);
2130 list_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2131 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2132 !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2133 BATADV_TT_REQUEST_TIMEOUT))
2137 tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
2141 memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN);
2142 tt_req_node->issued_at = jiffies;
2144 list_add(&tt_req_node->list, &bat_priv->tt.req_list);
2146 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2151 * batadv_tt_local_valid - verify that given tt entry is a valid one
2152 * @entry_ptr: to be checked local tt entry
2153 * @data_ptr: not used but definition required to satisfy the callback prototype
2155 * Returns 1 if the entry is a valid, 0 otherwise.
2157 static int batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
2159 const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2161 if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2166 static int batadv_tt_global_valid(const void *entry_ptr,
2167 const void *data_ptr)
2169 const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2170 const struct batadv_tt_global_entry *tt_global_entry;
2171 const struct batadv_orig_node *orig_node = data_ptr;
2173 if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2174 tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2177 tt_global_entry = container_of(tt_common_entry,
2178 struct batadv_tt_global_entry,
2181 return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
2185 * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2187 * @bat_priv: the bat priv with all the soft interface information
2188 * @hash: hash table containing the tt entries
2189 * @tt_len: expected tvlv tt data buffer length in number of bytes
2190 * @tvlv_buff: pointer to the buffer to fill with the TT data
2191 * @valid_cb: function to filter tt change entries
2192 * @cb_data: data passed to the filter function as argument
2194 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2195 struct batadv_hashtable *hash,
2196 void *tvlv_buff, uint16_t tt_len,
2197 int (*valid_cb)(const void *, const void *),
2200 struct batadv_tt_common_entry *tt_common_entry;
2201 struct batadv_tvlv_tt_change *tt_change;
2202 struct hlist_head *head;
2203 uint16_t tt_tot, tt_num_entries = 0;
2206 tt_tot = batadv_tt_entries(tt_len);
2207 tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
2210 for (i = 0; i < hash->size; i++) {
2211 head = &hash->table[i];
2213 hlist_for_each_entry_rcu(tt_common_entry,
2215 if (tt_tot == tt_num_entries)
2218 if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
2221 memcpy(tt_change->addr, tt_common_entry->addr,
2223 tt_change->flags = tt_common_entry->flags;
2224 tt_change->vid = htons(tt_common_entry->vid);
2225 memset(tt_change->reserved, 0,
2226 sizeof(tt_change->reserved));
2236 * batadv_tt_global_check_crc - check if all the CRCs are correct
2237 * @orig_node: originator for which the CRCs have to be checked
2238 * @tt_vlan: pointer to the first tvlv VLAN entry
2239 * @num_vlan: number of tvlv VLAN entries
2240 * @create: if true, create VLAN objects if not found
2242 * Return true if all the received CRCs match the locally stored ones, false
2245 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
2246 struct batadv_tvlv_tt_vlan_data *tt_vlan,
2249 struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
2250 struct batadv_orig_node_vlan *vlan;
2253 /* check if each received CRC matches the locally stored one */
2254 for (i = 0; i < num_vlan; i++) {
2255 tt_vlan_tmp = tt_vlan + i;
2257 /* if orig_node is a backbone node for this VLAN, don't check
2258 * the CRC as we ignore all the global entries over it
2260 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
2262 ntohs(tt_vlan_tmp->vid)))
2265 vlan = batadv_orig_node_vlan_get(orig_node,
2266 ntohs(tt_vlan_tmp->vid));
2270 if (vlan->tt.crc != ntohl(tt_vlan_tmp->crc))
2278 * batadv_tt_local_update_crc - update all the local CRCs
2279 * @bat_priv: the bat priv with all the soft interface information
2281 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
2283 struct batadv_softif_vlan *vlan;
2285 /* recompute the global CRC for each VLAN */
2287 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
2288 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
2294 * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2295 * @bat_priv: the bat priv with all the soft interface information
2296 * @orig_node: the orig_node for which the CRCs have to be updated
2298 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
2299 struct batadv_orig_node *orig_node)
2301 struct batadv_orig_node_vlan *vlan;
2304 /* recompute the global CRC for each VLAN */
2306 list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
2307 /* if orig_node is a backbone node for this VLAN, don't compute
2308 * the CRC as we ignore all the global entries over it
2310 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
2314 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
2321 * batadv_send_tt_request - send a TT Request message to a given node
2322 * @bat_priv: the bat priv with all the soft interface information
2323 * @dst_orig_node: the destination of the message
2324 * @ttvn: the version number that the source of the message is looking for
2325 * @tt_vlan: pointer to the first tvlv VLAN object to request
2326 * @num_vlan: number of tvlv VLAN entries
2327 * @full_table: ask for the entire translation table if true, while only for the
2328 * last TT diff otherwise
2330 static int batadv_send_tt_request(struct batadv_priv *bat_priv,
2331 struct batadv_orig_node *dst_orig_node,
2333 struct batadv_tvlv_tt_vlan_data *tt_vlan,
2334 uint16_t num_vlan, bool full_table)
2336 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2337 struct batadv_tt_req_node *tt_req_node = NULL;
2338 struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
2339 struct batadv_hard_iface *primary_if;
2343 primary_if = batadv_primary_if_get_selected(bat_priv);
2347 /* The new tt_req will be issued only if I'm not waiting for a
2348 * reply from the same orig_node yet
2350 tt_req_node = batadv_new_tt_req_node(bat_priv, dst_orig_node);
2354 size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
2355 tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
2359 tvlv_tt_data->flags = BATADV_TT_REQUEST;
2360 tvlv_tt_data->ttvn = ttvn;
2361 tvlv_tt_data->num_vlan = htons(num_vlan);
2363 /* send all the CRCs within the request. This is needed by intermediate
2364 * nodes to ensure they have the correct table before replying
2366 tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
2367 for (i = 0; i < num_vlan; i++) {
2368 tt_vlan_req->vid = tt_vlan->vid;
2369 tt_vlan_req->crc = tt_vlan->crc;
2376 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2378 batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
2379 dst_orig_node->orig, full_table ? 'F' : '.');
2381 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
2382 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2383 dst_orig_node->orig, BATADV_TVLV_TT, 1,
2384 tvlv_tt_data, size);
2389 batadv_hardif_free_ref(primary_if);
2390 if (ret && tt_req_node) {
2391 spin_lock_bh(&bat_priv->tt.req_list_lock);
2392 list_del(&tt_req_node->list);
2393 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2396 kfree(tvlv_tt_data);
2401 * batadv_send_other_tt_response - send reply to tt request concerning another
2402 * node's translation table
2403 * @bat_priv: the bat priv with all the soft interface information
2404 * @tt_data: tt data containing the tt request information
2405 * @req_src: mac address of tt request sender
2406 * @req_dst: mac address of tt request recipient
2408 * Returns true if tt request reply was sent, false otherwise.
2410 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
2411 struct batadv_tvlv_tt_data *tt_data,
2412 uint8_t *req_src, uint8_t *req_dst)
2414 struct batadv_orig_node *req_dst_orig_node;
2415 struct batadv_orig_node *res_dst_orig_node = NULL;
2416 struct batadv_tvlv_tt_change *tt_change;
2417 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2418 struct batadv_tvlv_tt_vlan_data *tt_vlan;
2419 bool ret = false, full_table;
2420 uint8_t orig_ttvn, req_ttvn;
2424 batadv_dbg(BATADV_DBG_TT, bat_priv,
2425 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2426 req_src, tt_data->ttvn, req_dst,
2427 (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2429 /* Let's get the orig node of the REAL destination */
2430 req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
2431 if (!req_dst_orig_node)
2434 res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
2435 if (!res_dst_orig_node)
2438 orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
2439 req_ttvn = tt_data->ttvn;
2441 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
2442 /* this node doesn't have the requested data */
2443 if (orig_ttvn != req_ttvn ||
2444 !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
2445 ntohs(tt_data->num_vlan)))
2448 /* If the full table has been explicitly requested */
2449 if (tt_data->flags & BATADV_TT_FULL_TABLE ||
2450 !req_dst_orig_node->tt_buff)
2455 /* TT fragmentation hasn't been implemented yet, so send as many
2456 * TT entries fit a single packet as possible only
2459 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
2460 tt_len = req_dst_orig_node->tt_buff_len;
2462 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2469 /* Copy the last orig_node's OGM buffer */
2470 memcpy(tt_change, req_dst_orig_node->tt_buff,
2471 req_dst_orig_node->tt_buff_len);
2472 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2474 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2475 * in the initial part
2478 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2485 /* fill the rest of the tvlv with the real TT entries */
2486 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
2488 batadv_tt_global_valid,
2492 /* Don't send the response, if larger than fragmented packet. */
2493 tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
2494 if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
2495 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
2496 "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
2497 res_dst_orig_node->orig);
2501 tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2502 tvlv_tt_data->ttvn = req_ttvn;
2505 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2507 batadv_dbg(BATADV_DBG_TT, bat_priv,
2508 "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2509 res_dst_orig_node->orig, req_dst_orig_node->orig,
2510 full_table ? 'F' : '.', req_ttvn);
2512 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2514 batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
2515 req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2522 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2525 if (res_dst_orig_node)
2526 batadv_orig_node_free_ref(res_dst_orig_node);
2527 if (req_dst_orig_node)
2528 batadv_orig_node_free_ref(req_dst_orig_node);
2529 kfree(tvlv_tt_data);
2534 * batadv_send_my_tt_response - send reply to tt request concerning this node's
2536 * @bat_priv: the bat priv with all the soft interface information
2537 * @tt_data: tt data containing the tt request information
2538 * @req_src: mac address of tt request sender
2540 * Returns true if tt request reply was sent, false otherwise.
2542 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
2543 struct batadv_tvlv_tt_data *tt_data,
2546 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2547 struct batadv_hard_iface *primary_if = NULL;
2548 struct batadv_tvlv_tt_change *tt_change;
2549 struct batadv_orig_node *orig_node;
2550 uint8_t my_ttvn, req_ttvn;
2555 batadv_dbg(BATADV_DBG_TT, bat_priv,
2556 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2557 req_src, tt_data->ttvn,
2558 (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2560 spin_lock_bh(&bat_priv->tt.commit_lock);
2562 my_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
2563 req_ttvn = tt_data->ttvn;
2565 orig_node = batadv_orig_hash_find(bat_priv, req_src);
2569 primary_if = batadv_primary_if_get_selected(bat_priv);
2573 /* If the full table has been explicitly requested or the gap
2574 * is too big send the whole local translation table
2576 if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
2577 !bat_priv->tt.last_changeset)
2582 /* TT fragmentation hasn't been implemented yet, so send as many
2583 * TT entries fit a single packet as possible only
2586 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
2588 tt_len = bat_priv->tt.last_changeset_len;
2589 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2596 /* Copy the last orig_node's OGM buffer */
2597 memcpy(tt_change, bat_priv->tt.last_changeset,
2598 bat_priv->tt.last_changeset_len);
2599 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2601 req_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
2603 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2604 * in the initial part
2607 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2614 /* fill the rest of the tvlv with the real TT entries */
2615 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
2617 batadv_tt_local_valid, NULL);
2620 tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2621 tvlv_tt_data->ttvn = req_ttvn;
2624 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2626 batadv_dbg(BATADV_DBG_TT, bat_priv,
2627 "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2628 orig_node->orig, full_table ? 'F' : '.', req_ttvn);
2630 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2632 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2633 req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2639 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2641 spin_unlock_bh(&bat_priv->tt.commit_lock);
2643 batadv_orig_node_free_ref(orig_node);
2645 batadv_hardif_free_ref(primary_if);
2646 kfree(tvlv_tt_data);
2647 /* The packet was for this host, so it doesn't need to be re-routed */
2652 * batadv_send_tt_response - send reply to tt request
2653 * @bat_priv: the bat priv with all the soft interface information
2654 * @tt_data: tt data containing the tt request information
2655 * @req_src: mac address of tt request sender
2656 * @req_dst: mac address of tt request recipient
2658 * Returns true if tt request reply was sent, false otherwise.
2660 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
2661 struct batadv_tvlv_tt_data *tt_data,
2662 uint8_t *req_src, uint8_t *req_dst)
2664 if (batadv_is_my_mac(bat_priv, req_dst))
2665 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
2667 return batadv_send_other_tt_response(bat_priv, tt_data,
2671 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
2672 struct batadv_orig_node *orig_node,
2673 struct batadv_tvlv_tt_change *tt_change,
2674 uint16_t tt_num_changes, uint8_t ttvn)
2679 for (i = 0; i < tt_num_changes; i++) {
2680 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
2681 roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
2682 batadv_tt_global_del(bat_priv, orig_node,
2683 (tt_change + i)->addr,
2684 ntohs((tt_change + i)->vid),
2685 "tt removed by changes",
2688 if (!batadv_tt_global_add(bat_priv, orig_node,
2689 (tt_change + i)->addr,
2690 ntohs((tt_change + i)->vid),
2691 (tt_change + i)->flags, ttvn))
2692 /* In case of problem while storing a
2693 * global_entry, we stop the updating
2694 * procedure without committing the
2695 * ttvn change. This will avoid to send
2696 * corrupted data on tt_request
2701 orig_node->tt_initialised = true;
2704 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
2705 struct batadv_tvlv_tt_change *tt_change,
2706 uint8_t ttvn, uint8_t *resp_src,
2707 uint16_t num_entries)
2709 struct batadv_orig_node *orig_node;
2711 orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2715 /* Purge the old table first.. */
2716 batadv_tt_global_del_orig(bat_priv, orig_node, -1,
2717 "Received full table");
2719 _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
2722 spin_lock_bh(&orig_node->tt_buff_lock);
2723 kfree(orig_node->tt_buff);
2724 orig_node->tt_buff_len = 0;
2725 orig_node->tt_buff = NULL;
2726 spin_unlock_bh(&orig_node->tt_buff_lock);
2728 atomic_set(&orig_node->last_ttvn, ttvn);
2732 batadv_orig_node_free_ref(orig_node);
2735 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
2736 struct batadv_orig_node *orig_node,
2737 uint16_t tt_num_changes, uint8_t ttvn,
2738 struct batadv_tvlv_tt_change *tt_change)
2740 _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
2741 tt_num_changes, ttvn);
2743 batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
2744 batadv_tt_len(tt_num_changes));
2745 atomic_set(&orig_node->last_ttvn, ttvn);
2749 * batadv_is_my_client - check if a client is served by the local node
2750 * @bat_priv: the bat priv with all the soft interface information
2751 * @addr: the mac adress of the client to check
2752 * @vid: VLAN identifier
2754 * Returns true if the client is served by this node, false otherwise.
2756 bool batadv_is_my_client(struct batadv_priv *bat_priv, const uint8_t *addr,
2759 struct batadv_tt_local_entry *tt_local_entry;
2762 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
2763 if (!tt_local_entry)
2765 /* Check if the client has been logically deleted (but is kept for
2766 * consistency purpose)
2768 if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
2769 (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
2774 batadv_tt_local_entry_free_ref(tt_local_entry);
2779 * batadv_handle_tt_response - process incoming tt reply
2780 * @bat_priv: the bat priv with all the soft interface information
2781 * @tt_data: tt data containing the tt request information
2782 * @resp_src: mac address of tt reply sender
2783 * @num_entries: number of tt change entries appended to the tt data
2785 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
2786 struct batadv_tvlv_tt_data *tt_data,
2787 uint8_t *resp_src, uint16_t num_entries)
2789 struct batadv_tt_req_node *node, *safe;
2790 struct batadv_orig_node *orig_node = NULL;
2791 struct batadv_tvlv_tt_change *tt_change;
2792 uint8_t *tvlv_ptr = (uint8_t *)tt_data;
2793 uint16_t change_offset;
2795 batadv_dbg(BATADV_DBG_TT, bat_priv,
2796 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
2797 resp_src, tt_data->ttvn, num_entries,
2798 (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2800 orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2804 spin_lock_bh(&orig_node->tt_lock);
2806 change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
2807 change_offset *= ntohs(tt_data->num_vlan);
2808 change_offset += sizeof(*tt_data);
2809 tvlv_ptr += change_offset;
2811 tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
2812 if (tt_data->flags & BATADV_TT_FULL_TABLE) {
2813 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
2814 resp_src, num_entries);
2816 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
2817 tt_data->ttvn, tt_change);
2820 /* Recalculate the CRC for this orig_node and store it */
2821 batadv_tt_global_update_crc(bat_priv, orig_node);
2823 spin_unlock_bh(&orig_node->tt_lock);
2825 /* Delete the tt_req_node from pending tt_requests list */
2826 spin_lock_bh(&bat_priv->tt.req_list_lock);
2827 list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2828 if (!batadv_compare_eth(node->addr, resp_src))
2830 list_del(&node->list);
2834 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2837 batadv_orig_node_free_ref(orig_node);
2840 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
2842 struct batadv_tt_roam_node *node, *safe;
2844 spin_lock_bh(&bat_priv->tt.roam_list_lock);
2846 list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2847 list_del(&node->list);
2851 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2854 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
2856 struct batadv_tt_roam_node *node, *safe;
2858 spin_lock_bh(&bat_priv->tt.roam_list_lock);
2859 list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2860 if (!batadv_has_timed_out(node->first_time,
2861 BATADV_ROAMING_MAX_TIME))
2864 list_del(&node->list);
2867 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2870 /* This function checks whether the client already reached the
2871 * maximum number of possible roaming phases. In this case the ROAMING_ADV
2874 * returns true if the ROAMING_ADV can be sent, false otherwise
2876 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv,
2879 struct batadv_tt_roam_node *tt_roam_node;
2882 spin_lock_bh(&bat_priv->tt.roam_list_lock);
2883 /* The new tt_req will be issued only if I'm not waiting for a
2884 * reply from the same orig_node yet
2886 list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
2887 if (!batadv_compare_eth(tt_roam_node->addr, client))
2890 if (batadv_has_timed_out(tt_roam_node->first_time,
2891 BATADV_ROAMING_MAX_TIME))
2894 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
2895 /* Sorry, you roamed too many times! */
2902 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
2906 tt_roam_node->first_time = jiffies;
2907 atomic_set(&tt_roam_node->counter,
2908 BATADV_ROAMING_MAX_COUNT - 1);
2909 memcpy(tt_roam_node->addr, client, ETH_ALEN);
2911 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
2916 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2921 * batadv_send_roam_adv - send a roaming advertisement message
2922 * @bat_priv: the bat priv with all the soft interface information
2923 * @client: mac address of the roaming client
2924 * @vid: VLAN identifier
2925 * @orig_node: message destination
2927 * Send a ROAMING_ADV message to the node which was previously serving this
2928 * client. This is done to inform the node that from now on all traffic destined
2929 * for this particular roamed client has to be forwarded to the sender of the
2932 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
2934 struct batadv_orig_node *orig_node)
2936 struct batadv_hard_iface *primary_if;
2937 struct batadv_tvlv_roam_adv tvlv_roam;
2939 primary_if = batadv_primary_if_get_selected(bat_priv);
2943 /* before going on we have to check whether the client has
2944 * already roamed to us too many times
2946 if (!batadv_tt_check_roam_count(bat_priv, client))
2949 batadv_dbg(BATADV_DBG_TT, bat_priv,
2950 "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
2951 orig_node->orig, client, BATADV_PRINT_VID(vid));
2953 batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
2955 memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
2956 tvlv_roam.vid = htons(vid);
2958 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2959 orig_node->orig, BATADV_TVLV_ROAM, 1,
2960 &tvlv_roam, sizeof(tvlv_roam));
2964 batadv_hardif_free_ref(primary_if);
2967 static void batadv_tt_purge(struct work_struct *work)
2969 struct delayed_work *delayed_work;
2970 struct batadv_priv_tt *priv_tt;
2971 struct batadv_priv *bat_priv;
2973 delayed_work = container_of(work, struct delayed_work, work);
2974 priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
2975 bat_priv = container_of(priv_tt, struct batadv_priv, tt);
2977 batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
2978 batadv_tt_global_purge(bat_priv);
2979 batadv_tt_req_purge(bat_priv);
2980 batadv_tt_roam_purge(bat_priv);
2982 queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
2983 msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
2986 void batadv_tt_free(struct batadv_priv *bat_priv)
2988 batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
2989 batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
2991 cancel_delayed_work_sync(&bat_priv->tt.work);
2993 batadv_tt_local_table_free(bat_priv);
2994 batadv_tt_global_table_free(bat_priv);
2995 batadv_tt_req_list_free(bat_priv);
2996 batadv_tt_changes_list_free(bat_priv);
2997 batadv_tt_roam_list_free(bat_priv);
2999 kfree(bat_priv->tt.last_changeset);
3003 * batadv_tt_local_set_flags - set or unset the specified flags on the local
3004 * table and possibly count them in the TT size
3005 * @bat_priv: the bat priv with all the soft interface information
3006 * @flags: the flag to switch
3007 * @enable: whether to set or unset the flag
3008 * @count: whether to increase the TT size by the number of changed entries
3010 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv,
3011 uint16_t flags, bool enable, bool count)
3013 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3014 struct batadv_tt_common_entry *tt_common_entry;
3015 uint16_t changed_num = 0;
3016 struct hlist_head *head;
3022 for (i = 0; i < hash->size; i++) {
3023 head = &hash->table[i];
3026 hlist_for_each_entry_rcu(tt_common_entry,
3029 if ((tt_common_entry->flags & flags) == flags)
3031 tt_common_entry->flags |= flags;
3033 if (!(tt_common_entry->flags & flags))
3035 tt_common_entry->flags &= ~flags;
3042 batadv_tt_local_size_inc(bat_priv,
3043 tt_common_entry->vid);
3049 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3050 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3052 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3053 struct batadv_tt_common_entry *tt_common;
3054 struct batadv_tt_local_entry *tt_local;
3055 struct hlist_node *node_tmp;
3056 struct hlist_head *head;
3057 spinlock_t *list_lock; /* protects write access to the hash lists */
3063 for (i = 0; i < hash->size; i++) {
3064 head = &hash->table[i];
3065 list_lock = &hash->list_locks[i];
3067 spin_lock_bh(list_lock);
3068 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3070 if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3073 batadv_dbg(BATADV_DBG_TT, bat_priv,
3074 "Deleting local tt entry (%pM, vid: %d): pending\n",
3076 BATADV_PRINT_VID(tt_common->vid));
3078 batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3079 hlist_del_rcu(&tt_common->hash_entry);
3080 tt_local = container_of(tt_common,
3081 struct batadv_tt_local_entry,
3083 batadv_tt_local_entry_free_ref(tt_local);
3085 spin_unlock_bh(list_lock);
3090 * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3091 * which have been queued in the time since the last commit
3092 * @bat_priv: the bat priv with all the soft interface information
3094 * Caller must hold tt->commit_lock.
3096 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3098 if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3099 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3100 batadv_tt_tvlv_container_update(bat_priv);
3104 batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3106 batadv_tt_local_purge_pending_clients(bat_priv);
3107 batadv_tt_local_update_crc(bat_priv);
3109 /* Increment the TTVN only once per OGM interval */
3110 atomic_inc(&bat_priv->tt.vn);
3111 batadv_dbg(BATADV_DBG_TT, bat_priv,
3112 "Local changes committed, updating to ttvn %u\n",
3113 (uint8_t)atomic_read(&bat_priv->tt.vn));
3115 /* reset the sending counter */
3116 atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3117 batadv_tt_tvlv_container_update(bat_priv);
3121 * batadv_tt_local_commit_changes - commit all pending local tt changes which
3122 * have been queued in the time since the last commit
3123 * @bat_priv: the bat priv with all the soft interface information
3125 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3127 spin_lock_bh(&bat_priv->tt.commit_lock);
3128 batadv_tt_local_commit_changes_nolock(bat_priv);
3129 spin_unlock_bh(&bat_priv->tt.commit_lock);
3132 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src,
3133 uint8_t *dst, unsigned short vid)
3135 struct batadv_tt_local_entry *tt_local_entry = NULL;
3136 struct batadv_tt_global_entry *tt_global_entry = NULL;
3137 struct batadv_softif_vlan *vlan;
3140 vlan = batadv_softif_vlan_get(bat_priv, vid);
3141 if (!vlan || !atomic_read(&vlan->ap_isolation))
3144 tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3145 if (!tt_local_entry)
3148 tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
3149 if (!tt_global_entry)
3152 if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3159 batadv_softif_vlan_free_ref(vlan);
3160 if (tt_global_entry)
3161 batadv_tt_global_entry_free_ref(tt_global_entry);
3163 batadv_tt_local_entry_free_ref(tt_local_entry);
3168 * batadv_tt_update_orig - update global translation table with new tt
3169 * information received via ogms
3170 * @bat_priv: the bat priv with all the soft interface information
3171 * @orig: the orig_node of the ogm
3172 * @tt_vlan: pointer to the first tvlv VLAN entry
3173 * @tt_num_vlan: number of tvlv VLAN entries
3174 * @tt_change: pointer to the first entry in the TT buffer
3175 * @tt_num_changes: number of tt changes inside the tt buffer
3176 * @ttvn: translation table version number of this changeset
3177 * @tt_crc: crc32 checksum of orig node's translation table
3179 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
3180 struct batadv_orig_node *orig_node,
3181 const void *tt_buff, uint16_t tt_num_vlan,
3182 struct batadv_tvlv_tt_change *tt_change,
3183 uint16_t tt_num_changes, uint8_t ttvn)
3185 uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
3186 struct batadv_tvlv_tt_vlan_data *tt_vlan;
3187 bool full_table = true;
3189 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
3190 /* orig table not initialised AND first diff is in the OGM OR the ttvn
3191 * increased by one -> we can apply the attached changes
3193 if ((!orig_node->tt_initialised && ttvn == 1) ||
3194 ttvn - orig_ttvn == 1) {
3195 /* the OGM could not contain the changes due to their size or
3196 * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3198 * In this case send a tt request
3200 if (!tt_num_changes) {
3205 spin_lock_bh(&orig_node->tt_lock);
3207 tt_change = (struct batadv_tvlv_tt_change *)tt_buff;
3208 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
3211 /* Even if we received the precomputed crc with the OGM, we
3212 * prefer to recompute it to spot any possible inconsistency
3213 * in the global table
3215 batadv_tt_global_update_crc(bat_priv, orig_node);
3217 spin_unlock_bh(&orig_node->tt_lock);
3219 /* The ttvn alone is not enough to guarantee consistency
3220 * because a single value could represent different states
3221 * (due to the wrap around). Thus a node has to check whether
3222 * the resulting table (after applying the changes) is still
3223 * consistent or not. E.g. a node could disconnect while its
3224 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3225 * checking the CRC value is mandatory to detect the
3228 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
3232 /* if we missed more than one change or our tables are not
3233 * in sync anymore -> request fresh tt data
3235 if (!orig_node->tt_initialised || ttvn != orig_ttvn ||
3236 !batadv_tt_global_check_crc(orig_node, tt_vlan,
3239 batadv_dbg(BATADV_DBG_TT, bat_priv,
3240 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3241 orig_node->orig, ttvn, orig_ttvn,
3243 batadv_send_tt_request(bat_priv, orig_node, ttvn,
3244 tt_vlan, tt_num_vlan,
3252 * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3253 * @bat_priv: the bat priv with all the soft interface information
3254 * @addr: the mac address of the client to check
3255 * @vid: VLAN identifier
3257 * Returns true if we know that the client has moved from its old originator
3258 * to another one. This entry is still kept for consistency purposes and will be
3259 * deleted later by a DEL or because of timeout
3261 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
3262 uint8_t *addr, unsigned short vid)
3264 struct batadv_tt_global_entry *tt_global_entry;
3267 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
3268 if (!tt_global_entry)
3271 ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3272 batadv_tt_global_entry_free_ref(tt_global_entry);
3278 * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3279 * @bat_priv: the bat priv with all the soft interface information
3280 * @addr: the mac address of the local client to query
3281 * @vid: VLAN identifier
3283 * Returns true if the local client is known to be roaming (it is not served by
3284 * this node anymore) or not. If yes, the client is still present in the table
3285 * to keep the latter consistent with the node TTVN
3287 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
3288 uint8_t *addr, unsigned short vid)
3290 struct batadv_tt_local_entry *tt_local_entry;
3293 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3294 if (!tt_local_entry)
3297 ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3298 batadv_tt_local_entry_free_ref(tt_local_entry);
3303 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
3304 struct batadv_orig_node *orig_node,
3305 const unsigned char *addr,
3310 if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
3311 BATADV_TT_CLIENT_TEMP,
3312 atomic_read(&orig_node->last_ttvn)))
3315 batadv_dbg(BATADV_DBG_TT, bat_priv,
3316 "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3317 addr, BATADV_PRINT_VID(vid), orig_node->orig);
3324 * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
3325 * maximum packet size that can be transported through the mesh
3326 * @soft_iface: netdev struct of the mesh interface
3328 * Remove entries older than 'timeout' and half timeout if more entries need
3331 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
3333 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
3334 int packet_size_max = atomic_read(&bat_priv->packet_size_max);
3335 int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
3336 bool reduced = false;
3338 spin_lock_bh(&bat_priv->tt.commit_lock);
3341 table_size = batadv_tt_local_table_transmit_size(bat_priv);
3342 if (packet_size_max >= table_size)
3345 batadv_tt_local_purge(bat_priv, timeout);
3346 batadv_tt_local_purge_pending_clients(bat_priv);
3350 net_ratelimited_function(batadv_info, soft_iface,
3351 "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3355 /* commit these changes immediately, to avoid synchronization problem
3359 batadv_tt_local_commit_changes_nolock(bat_priv);
3361 spin_unlock_bh(&bat_priv->tt.commit_lock);
3365 * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3366 * @bat_priv: the bat priv with all the soft interface information
3367 * @orig: the orig_node of the ogm
3368 * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3369 * @tvlv_value: tvlv buffer containing the gateway data
3370 * @tvlv_value_len: tvlv buffer length
3372 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
3373 struct batadv_orig_node *orig,
3374 uint8_t flags, void *tvlv_value,
3375 uint16_t tvlv_value_len)
3377 struct batadv_tvlv_tt_vlan_data *tt_vlan;
3378 struct batadv_tvlv_tt_change *tt_change;
3379 struct batadv_tvlv_tt_data *tt_data;
3380 uint16_t num_entries, num_vlan;
3382 if (tvlv_value_len < sizeof(*tt_data))
3385 tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3386 tvlv_value_len -= sizeof(*tt_data);
3388 num_vlan = ntohs(tt_data->num_vlan);
3390 if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
3393 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3394 tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
3395 tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
3397 num_entries = batadv_tt_entries(tvlv_value_len);
3399 batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
3400 num_entries, tt_data->ttvn);
3404 * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3406 * @bat_priv: the bat priv with all the soft interface information
3407 * @src: mac address of tt tvlv sender
3408 * @dst: mac address of tt tvlv recipient
3409 * @tvlv_value: tvlv buffer containing the tt data
3410 * @tvlv_value_len: tvlv buffer length
3412 * Returns NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3415 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3416 uint8_t *src, uint8_t *dst,
3418 uint16_t tvlv_value_len)
3420 struct batadv_tvlv_tt_data *tt_data;
3421 uint16_t tt_vlan_len, tt_num_entries;
3425 if (tvlv_value_len < sizeof(*tt_data))
3426 return NET_RX_SUCCESS;
3428 tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3429 tvlv_value_len -= sizeof(*tt_data);
3431 tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
3432 tt_vlan_len *= ntohs(tt_data->num_vlan);
3434 if (tvlv_value_len < tt_vlan_len)
3435 return NET_RX_SUCCESS;
3437 tvlv_value_len -= tt_vlan_len;
3438 tt_num_entries = batadv_tt_entries(tvlv_value_len);
3440 switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
3441 case BATADV_TT_REQUEST:
3442 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
3444 /* If this node cannot provide a TT response the tt_request is
3447 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
3449 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3454 batadv_dbg(BATADV_DBG_TT, bat_priv,
3455 "Routing TT_REQUEST to %pM [%c]\n",
3457 /* tvlv API will re-route the packet */
3461 case BATADV_TT_RESPONSE:
3462 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
3464 if (batadv_is_my_mac(bat_priv, dst)) {
3465 batadv_handle_tt_response(bat_priv, tt_data,
3466 src, tt_num_entries);
3467 return NET_RX_SUCCESS;
3470 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3475 batadv_dbg(BATADV_DBG_TT, bat_priv,
3476 "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
3478 /* tvlv API will re-route the packet */
3482 return NET_RX_SUCCESS;
3486 * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3487 * @bat_priv: the bat priv with all the soft interface information
3488 * @src: mac address of tt tvlv sender
3489 * @dst: mac address of tt tvlv recipient
3490 * @tvlv_value: tvlv buffer containing the tt data
3491 * @tvlv_value_len: tvlv buffer length
3493 * Returns NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3496 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3497 uint8_t *src, uint8_t *dst,
3499 uint16_t tvlv_value_len)
3501 struct batadv_tvlv_roam_adv *roaming_adv;
3502 struct batadv_orig_node *orig_node = NULL;
3504 /* If this node is not the intended recipient of the
3505 * roaming advertisement the packet is forwarded
3506 * (the tvlv API will re-route the packet).
3508 if (!batadv_is_my_mac(bat_priv, dst))
3511 if (tvlv_value_len < sizeof(*roaming_adv))
3514 orig_node = batadv_orig_hash_find(bat_priv, src);
3518 batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
3519 roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
3521 batadv_dbg(BATADV_DBG_TT, bat_priv,
3522 "Received ROAMING_ADV from %pM (client %pM)\n",
3523 src, roaming_adv->client);
3525 batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
3526 ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
3527 atomic_read(&orig_node->last_ttvn) + 1);
3531 batadv_orig_node_free_ref(orig_node);
3532 return NET_RX_SUCCESS;
3536 * batadv_tt_init - initialise the translation table internals
3537 * @bat_priv: the bat priv with all the soft interface information
3539 * Return 0 on success or negative error number in case of failure.
3541 int batadv_tt_init(struct batadv_priv *bat_priv)
3545 /* synchronized flags must be remote */
3546 BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
3548 ret = batadv_tt_local_init(bat_priv);
3552 ret = batadv_tt_global_init(bat_priv);
3556 batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
3557 batadv_tt_tvlv_unicast_handler_v1,
3558 BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
3560 batadv_tvlv_handler_register(bat_priv, NULL,
3561 batadv_roam_tvlv_unicast_handler_v1,
3562 BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
3564 INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
3565 queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3566 msecs_to_jiffies(BATADV_TT_WORK_PERIOD));