1 /* Copyright (C) 2007-2015 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, see <http://www.gnu.org/licenses/>.
18 #include "translation-table.h"
21 #include <linux/atomic.h>
22 #include <linux/bitops.h>
23 #include <linux/bug.h>
24 #include <linux/byteorder/generic.h>
25 #include <linux/compiler.h>
26 #include <linux/crc32c.h>
27 #include <linux/errno.h>
28 #include <linux/etherdevice.h>
30 #include <linux/if_ether.h>
31 #include <linux/jhash.h>
32 #include <linux/jiffies.h>
33 #include <linux/kernel.h>
34 #include <linux/list.h>
35 #include <linux/lockdep.h>
36 #include <linux/netdevice.h>
37 #include <linux/rculist.h>
38 #include <linux/rcupdate.h>
39 #include <linux/seq_file.h>
40 #include <linux/slab.h>
41 #include <linux/spinlock.h>
42 #include <linux/stddef.h>
43 #include <linux/string.h>
44 #include <linux/workqueue.h>
45 #include <net/net_namespace.h>
47 #include "bridge_loop_avoidance.h"
48 #include "hard-interface.h"
50 #include "multicast.h"
51 #include "originator.h"
53 #include "soft-interface.h"
56 static struct lock_class_key batadv_tt_local_hash_lock_class_key;
57 static struct lock_class_key batadv_tt_global_hash_lock_class_key;
59 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
61 struct batadv_orig_node *orig_node);
62 static void batadv_tt_purge(struct work_struct *work);
64 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
65 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
66 struct batadv_orig_node *orig_node,
67 const unsigned char *addr,
68 unsigned short vid, const char *message,
71 /* returns 1 if they are the same mac addr */
72 static int batadv_compare_tt(const struct hlist_node *node, const void *data2)
74 const void *data1 = container_of(node, struct batadv_tt_common_entry,
77 return batadv_compare_eth(data1, data2);
81 * batadv_choose_tt - return the index of the tt entry in the hash table
82 * @data: pointer to the tt_common_entry object to map
83 * @size: the size of the hash table
85 * Returns the hash index where the object represented by 'data' should be
88 static inline u32 batadv_choose_tt(const void *data, u32 size)
90 struct batadv_tt_common_entry *tt;
93 tt = (struct batadv_tt_common_entry *)data;
94 hash = jhash(&tt->addr, ETH_ALEN, hash);
95 hash = jhash(&tt->vid, sizeof(tt->vid), hash);
101 * batadv_tt_hash_find - look for a client in the given hash table
102 * @hash: the hash table to search
103 * @addr: the mac address of the client to look for
104 * @vid: VLAN identifier
106 * Returns a pointer to the tt_common struct belonging to the searched client if
107 * found, NULL otherwise.
109 static struct batadv_tt_common_entry *
110 batadv_tt_hash_find(struct batadv_hashtable *hash, const u8 *addr,
113 struct hlist_head *head;
114 struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL;
120 ether_addr_copy(to_search.addr, addr);
123 index = batadv_choose_tt(&to_search, hash->size);
124 head = &hash->table[index];
127 hlist_for_each_entry_rcu(tt, head, hash_entry) {
128 if (!batadv_compare_eth(tt, addr))
134 if (!atomic_inc_not_zero(&tt->refcount))
146 * batadv_tt_local_hash_find - search the local table for a given client
147 * @bat_priv: the bat priv with all the soft interface information
148 * @addr: the mac address of the client to look for
149 * @vid: VLAN identifier
151 * Returns a pointer to the corresponding tt_local_entry struct if the client is
152 * found, NULL otherwise.
154 static struct batadv_tt_local_entry *
155 batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
158 struct batadv_tt_common_entry *tt_common_entry;
159 struct batadv_tt_local_entry *tt_local_entry = NULL;
161 tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, addr,
164 tt_local_entry = container_of(tt_common_entry,
165 struct batadv_tt_local_entry,
167 return tt_local_entry;
171 * batadv_tt_global_hash_find - search the global table for a given client
172 * @bat_priv: the bat priv with all the soft interface information
173 * @addr: the mac address of the client to look for
174 * @vid: VLAN identifier
176 * Returns a pointer to the corresponding tt_global_entry struct if the client
177 * is found, NULL otherwise.
179 static struct batadv_tt_global_entry *
180 batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
183 struct batadv_tt_common_entry *tt_common_entry;
184 struct batadv_tt_global_entry *tt_global_entry = NULL;
186 tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, addr,
189 tt_global_entry = container_of(tt_common_entry,
190 struct batadv_tt_global_entry,
192 return tt_global_entry;
196 batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry)
198 if (atomic_dec_and_test(&tt_local_entry->common.refcount))
199 kfree_rcu(tt_local_entry, common.rcu);
203 * batadv_tt_global_entry_free_ref - decrement the refcounter for a
204 * tt_global_entry and possibly free it
205 * @tt_global_entry: the object to free
208 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry)
210 if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
211 batadv_tt_global_del_orig_list(tt_global_entry);
212 kfree_rcu(tt_global_entry, common.rcu);
217 * batadv_tt_global_hash_count - count the number of orig entries
218 * @hash: hash table containing the tt entries
219 * @addr: the mac address of the client to count entries for
220 * @vid: VLAN identifier
222 * Return the number of originators advertising the given address/data
223 * (excluding ourself).
225 int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
226 const u8 *addr, unsigned short vid)
228 struct batadv_tt_global_entry *tt_global_entry;
231 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
232 if (!tt_global_entry)
235 count = atomic_read(&tt_global_entry->orig_list_count);
236 batadv_tt_global_entry_free_ref(tt_global_entry);
241 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
243 struct batadv_tt_orig_list_entry *orig_entry;
245 orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu);
247 /* We are in an rcu callback here, therefore we cannot use
248 * batadv_orig_node_free_ref() and its call_rcu():
249 * An rcu_barrier() wouldn't wait for that to finish
251 batadv_orig_node_free_ref_now(orig_entry->orig_node);
256 * batadv_tt_local_size_mod - change the size by v of the local table identified
258 * @bat_priv: the bat priv with all the soft interface information
259 * @vid: the VLAN identifier of the sub-table to change
260 * @v: the amount to sum to the local table size
262 static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
263 unsigned short vid, int v)
265 struct batadv_softif_vlan *vlan;
267 vlan = batadv_softif_vlan_get(bat_priv, vid);
271 atomic_add(v, &vlan->tt.num_entries);
273 batadv_softif_vlan_free_ref(vlan);
277 * batadv_tt_local_size_inc - increase by one the local table size for the given
279 * @bat_priv: the bat priv with all the soft interface information
280 * @vid: the VLAN identifier
282 static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv,
285 batadv_tt_local_size_mod(bat_priv, vid, 1);
289 * batadv_tt_local_size_dec - decrease by one the local table size for the given
291 * @bat_priv: the bat priv with all the soft interface information
292 * @vid: the VLAN identifier
294 static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv,
297 batadv_tt_local_size_mod(bat_priv, vid, -1);
301 * batadv_tt_global_size_mod - change the size by v of the local table
303 * @bat_priv: the bat priv with all the soft interface information
304 * @vid: the VLAN identifier
305 * @v: the amount to sum to the global table size
307 static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node,
308 unsigned short vid, int v)
310 struct batadv_orig_node_vlan *vlan;
312 vlan = batadv_orig_node_vlan_new(orig_node, vid);
316 if (atomic_add_return(v, &vlan->tt.num_entries) == 0) {
317 spin_lock_bh(&orig_node->vlan_list_lock);
318 hlist_del_init_rcu(&vlan->list);
319 spin_unlock_bh(&orig_node->vlan_list_lock);
320 batadv_orig_node_vlan_free_ref(vlan);
323 batadv_orig_node_vlan_free_ref(vlan);
327 * batadv_tt_global_size_inc - increase by one the global table size for the
329 * @orig_node: the originator which global table size has to be decreased
330 * @vid: the vlan identifier
332 static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
335 batadv_tt_global_size_mod(orig_node, vid, 1);
339 * batadv_tt_global_size_dec - decrease by one the global table size for the
341 * @orig_node: the originator which global table size has to be decreased
342 * @vid: the vlan identifier
344 static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
347 batadv_tt_global_size_mod(orig_node, vid, -1);
351 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry)
353 if (!atomic_dec_and_test(&orig_entry->refcount))
356 call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
360 * batadv_tt_local_event - store a local TT event (ADD/DEL)
361 * @bat_priv: the bat priv with all the soft interface information
362 * @tt_local_entry: the TT entry involved in the event
363 * @event_flags: flags to store in the event structure
365 static void batadv_tt_local_event(struct batadv_priv *bat_priv,
366 struct batadv_tt_local_entry *tt_local_entry,
369 struct batadv_tt_change_node *tt_change_node, *entry, *safe;
370 struct batadv_tt_common_entry *common = &tt_local_entry->common;
371 u8 flags = common->flags | event_flags;
372 bool event_removed = false;
373 bool del_op_requested, del_op_entry;
375 tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
379 tt_change_node->change.flags = flags;
380 memset(tt_change_node->change.reserved, 0,
381 sizeof(tt_change_node->change.reserved));
382 ether_addr_copy(tt_change_node->change.addr, common->addr);
383 tt_change_node->change.vid = htons(common->vid);
385 del_op_requested = flags & BATADV_TT_CLIENT_DEL;
387 /* check for ADD+DEL or DEL+ADD events */
388 spin_lock_bh(&bat_priv->tt.changes_list_lock);
389 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
391 if (!batadv_compare_eth(entry->change.addr, common->addr))
394 /* DEL+ADD in the same orig interval have no effect and can be
395 * removed to avoid silly behaviour on the receiver side. The
396 * other way around (ADD+DEL) can happen in case of roaming of
397 * a client still in the NEW state. Roaming of NEW clients is
398 * now possible due to automatically recognition of "temporary"
401 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
402 if (!del_op_requested && del_op_entry)
404 if (del_op_requested && !del_op_entry)
407 /* this is a second add in the same originator interval. It
408 * means that flags have been changed: update them!
410 if (!del_op_requested && !del_op_entry)
411 entry->change.flags = flags;
415 list_del(&entry->list);
417 kfree(tt_change_node);
418 event_removed = true;
422 /* track the change in the OGMinterval list */
423 list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
426 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
429 atomic_dec(&bat_priv->tt.local_changes);
431 atomic_inc(&bat_priv->tt.local_changes);
435 * batadv_tt_len - compute length in bytes of given number of tt changes
436 * @changes_num: number of tt changes
438 * Returns computed length in bytes.
440 static int batadv_tt_len(int changes_num)
442 return changes_num * sizeof(struct batadv_tvlv_tt_change);
446 * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
447 * @tt_len: available space
449 * Returns the number of entries.
451 static u16 batadv_tt_entries(u16 tt_len)
453 return tt_len / batadv_tt_len(1);
457 * batadv_tt_local_table_transmit_size - calculates the local translation table
458 * size when transmitted over the air
459 * @bat_priv: the bat priv with all the soft interface information
461 * Returns local translation table size in bytes.
463 static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
466 u16 tt_local_entries = 0;
467 struct batadv_softif_vlan *vlan;
471 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
473 tt_local_entries += atomic_read(&vlan->tt.num_entries);
477 /* header size of tvlv encapsulated tt response payload */
478 hdr_size = sizeof(struct batadv_unicast_tvlv_packet);
479 hdr_size += sizeof(struct batadv_tvlv_hdr);
480 hdr_size += sizeof(struct batadv_tvlv_tt_data);
481 hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data);
483 return hdr_size + batadv_tt_len(tt_local_entries);
486 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
488 if (bat_priv->tt.local_hash)
491 bat_priv->tt.local_hash = batadv_hash_new(1024);
493 if (!bat_priv->tt.local_hash)
496 batadv_hash_set_lock_class(bat_priv->tt.local_hash,
497 &batadv_tt_local_hash_lock_class_key);
502 static void batadv_tt_global_free(struct batadv_priv *bat_priv,
503 struct batadv_tt_global_entry *tt_global,
506 batadv_dbg(BATADV_DBG_TT, bat_priv,
507 "Deleting global tt entry %pM (vid: %d): %s\n",
508 tt_global->common.addr,
509 BATADV_PRINT_VID(tt_global->common.vid), message);
511 batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
512 batadv_choose_tt, &tt_global->common);
513 batadv_tt_global_entry_free_ref(tt_global);
517 * batadv_tt_local_add - add a new client to the local table or update an
519 * @soft_iface: netdev struct of the mesh interface
520 * @addr: the mac address of the client to add
521 * @vid: VLAN identifier
522 * @ifindex: index of the interface where the client is connected to (useful to
523 * identify wireless clients)
524 * @mark: the value contained in the skb->mark field of the received packet (if
527 * Returns true if the client was successfully added, false otherwise.
529 bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
530 unsigned short vid, int ifindex, u32 mark)
532 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
533 struct batadv_tt_local_entry *tt_local;
534 struct batadv_tt_global_entry *tt_global = NULL;
535 struct batadv_softif_vlan *vlan;
536 struct net_device *in_dev = NULL;
537 struct hlist_head *head;
538 struct batadv_tt_orig_list_entry *orig_entry;
539 int hash_added, table_size, packet_size_max;
541 bool roamed_back = false;
545 if (ifindex != BATADV_NULL_IFINDEX)
546 in_dev = dev_get_by_index(&init_net, ifindex);
548 tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
550 if (!is_multicast_ether_addr(addr))
551 tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
554 tt_local->last_seen = jiffies;
555 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
556 batadv_dbg(BATADV_DBG_TT, bat_priv,
557 "Re-adding pending client %pM (vid: %d)\n",
558 addr, BATADV_PRINT_VID(vid));
559 /* whatever the reason why the PENDING flag was set,
560 * this is a client which was enqueued to be removed in
561 * this orig_interval. Since it popped up again, the
562 * flag can be reset like it was never enqueued
564 tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
568 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
569 batadv_dbg(BATADV_DBG_TT, bat_priv,
570 "Roaming client %pM (vid: %d) came back to its original location\n",
571 addr, BATADV_PRINT_VID(vid));
572 /* the ROAM flag is set because this client roamed away
573 * and the node got a roaming_advertisement message. Now
574 * that the client popped up again at its original
575 * location such flag can be unset
577 tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
583 /* Ignore the client if we cannot send it in a full table response. */
584 table_size = batadv_tt_local_table_transmit_size(bat_priv);
585 table_size += batadv_tt_len(1);
586 packet_size_max = atomic_read(&bat_priv->packet_size_max);
587 if (table_size > packet_size_max) {
588 net_ratelimited_function(batadv_info, soft_iface,
589 "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
590 table_size, packet_size_max, addr);
594 tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC);
598 /* increase the refcounter of the related vlan */
599 vlan = batadv_softif_vlan_get(bat_priv, vid);
600 if (WARN(!vlan, "adding TT local entry %pM to non-existent VLAN %d",
601 addr, BATADV_PRINT_VID(vid))) {
607 batadv_dbg(BATADV_DBG_TT, bat_priv,
608 "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
609 addr, BATADV_PRINT_VID(vid),
610 (u8)atomic_read(&bat_priv->tt.vn));
612 ether_addr_copy(tt_local->common.addr, addr);
613 /* The local entry has to be marked as NEW to avoid to send it in
614 * a full table response going out before the next ttvn increment
615 * (consistency check)
617 tt_local->common.flags = BATADV_TT_CLIENT_NEW;
618 tt_local->common.vid = vid;
619 if (batadv_is_wifi_netdev(in_dev))
620 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
621 atomic_set(&tt_local->common.refcount, 2);
622 tt_local->last_seen = jiffies;
623 tt_local->common.added_at = tt_local->last_seen;
625 /* the batman interface mac and multicast addresses should never be
628 if (batadv_compare_eth(addr, soft_iface->dev_addr) ||
629 is_multicast_ether_addr(addr))
630 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
632 hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
633 batadv_choose_tt, &tt_local->common,
634 &tt_local->common.hash_entry);
636 if (unlikely(hash_added != 0)) {
637 /* remove the reference for the hash */
638 batadv_tt_local_entry_free_ref(tt_local);
639 batadv_softif_vlan_free_ref(vlan);
644 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
647 /* Check whether it is a roaming, but don't do anything if the roaming
648 * process has already been handled
650 if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
651 /* These node are probably going to update their tt table */
652 head = &tt_global->orig_list;
654 hlist_for_each_entry_rcu(orig_entry, head, list) {
655 batadv_send_roam_adv(bat_priv, tt_global->common.addr,
656 tt_global->common.vid,
657 orig_entry->orig_node);
661 batadv_tt_global_free(bat_priv, tt_global,
665 /* The global entry has to be marked as ROAMING and
666 * has to be kept for consistency purpose
668 tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
669 tt_global->roam_at = jiffies;
673 /* store the current remote flags before altering them. This helps
674 * understanding is flags are changing or not
676 remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK;
678 if (batadv_is_wifi_netdev(in_dev))
679 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
681 tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI;
683 /* check the mark in the skb: if it's equal to the configured
684 * isolation_mark, it means the packet is coming from an isolated
687 match_mark = (mark & bat_priv->isolation_mark_mask);
688 if (bat_priv->isolation_mark_mask &&
689 match_mark == bat_priv->isolation_mark)
690 tt_local->common.flags |= BATADV_TT_CLIENT_ISOLA;
692 tt_local->common.flags &= ~BATADV_TT_CLIENT_ISOLA;
694 /* if any "dynamic" flag has been modified, resend an ADD event for this
695 * entry so that all the nodes can get the new flags
697 if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
698 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
705 batadv_tt_local_entry_free_ref(tt_local);
707 batadv_tt_global_entry_free_ref(tt_global);
712 * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
713 * within a TT Response directed to another node
714 * @orig_node: originator for which the TT data has to be prepared
715 * @tt_data: uninitialised pointer to the address of the TVLV buffer
716 * @tt_change: uninitialised pointer to the address of the area where the TT
717 * changed can be stored
718 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
719 * function reserves the amount of space needed to send the entire global TT
720 * table. In case of success the value is updated with the real amount of
723 * Allocate the needed amount of memory for the entire TT TVLV and write its
724 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
725 * objects, one per active VLAN served by the originator node.
727 * Return the size of the allocated buffer or 0 in case of failure.
730 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
731 struct batadv_tvlv_tt_data **tt_data,
732 struct batadv_tvlv_tt_change **tt_change,
739 struct batadv_tvlv_tt_vlan_data *tt_vlan;
740 struct batadv_orig_node_vlan *vlan;
744 hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
746 num_entries += atomic_read(&vlan->tt.num_entries);
749 change_offset = sizeof(**tt_data);
750 change_offset += num_vlan * sizeof(*tt_vlan);
752 /* if tt_len is negative, allocate the space needed by the full table */
754 *tt_len = batadv_tt_len(num_entries);
757 tvlv_len += change_offset;
759 *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
765 (*tt_data)->flags = BATADV_NO_FLAGS;
766 (*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
767 (*tt_data)->num_vlan = htons(num_vlan);
769 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
770 hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
771 tt_vlan->vid = htons(vlan->vid);
772 tt_vlan->crc = htonl(vlan->tt.crc);
777 tt_change_ptr = (u8 *)*tt_data + change_offset;
778 *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
786 * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
788 * @bat_priv: the bat priv with all the soft interface information
789 * @tt_data: uninitialised pointer to the address of the TVLV buffer
790 * @tt_change: uninitialised pointer to the address of the area where the TT
791 * changes can be stored
792 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
793 * function reserves the amount of space needed to send the entire local TT
794 * table. In case of success the value is updated with the real amount of
797 * Allocate the needed amount of memory for the entire TT TVLV and write its
798 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
799 * objects, one per active VLAN.
801 * Return the size of the allocated buffer or 0 in case of failure.
804 batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
805 struct batadv_tvlv_tt_data **tt_data,
806 struct batadv_tvlv_tt_change **tt_change,
809 struct batadv_tvlv_tt_vlan_data *tt_vlan;
810 struct batadv_softif_vlan *vlan;
818 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
820 num_entries += atomic_read(&vlan->tt.num_entries);
823 change_offset = sizeof(**tt_data);
824 change_offset += num_vlan * sizeof(*tt_vlan);
826 /* if tt_len is negative, allocate the space needed by the full table */
828 *tt_len = batadv_tt_len(num_entries);
831 tvlv_len += change_offset;
833 *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
839 (*tt_data)->flags = BATADV_NO_FLAGS;
840 (*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
841 (*tt_data)->num_vlan = htons(num_vlan);
843 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
844 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
845 tt_vlan->vid = htons(vlan->vid);
846 tt_vlan->crc = htonl(vlan->tt.crc);
851 tt_change_ptr = (u8 *)*tt_data + change_offset;
852 *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
860 * batadv_tt_tvlv_container_update - update the translation table tvlv container
861 * after local tt changes have been committed
862 * @bat_priv: the bat priv with all the soft interface information
864 static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
866 struct batadv_tt_change_node *entry, *safe;
867 struct batadv_tvlv_tt_data *tt_data;
868 struct batadv_tvlv_tt_change *tt_change;
869 int tt_diff_len, tt_change_len = 0;
870 int tt_diff_entries_num = 0;
871 int tt_diff_entries_count = 0;
874 tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
875 tt_diff_len = batadv_tt_len(tt_diff_entries_num);
877 /* if we have too many changes for one packet don't send any
878 * and wait for the tt table request which will be fragmented
880 if (tt_diff_len > bat_priv->soft_iface->mtu)
883 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
884 &tt_change, &tt_diff_len);
888 tt_data->flags = BATADV_TT_OGM_DIFF;
890 if (tt_diff_len == 0)
891 goto container_register;
893 spin_lock_bh(&bat_priv->tt.changes_list_lock);
894 atomic_set(&bat_priv->tt.local_changes, 0);
896 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
898 if (tt_diff_entries_count < tt_diff_entries_num) {
899 memcpy(tt_change + tt_diff_entries_count,
901 sizeof(struct batadv_tvlv_tt_change));
902 tt_diff_entries_count++;
904 list_del(&entry->list);
907 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
909 /* Keep the buffer for possible tt_request */
910 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
911 kfree(bat_priv->tt.last_changeset);
912 bat_priv->tt.last_changeset_len = 0;
913 bat_priv->tt.last_changeset = NULL;
914 tt_change_len = batadv_tt_len(tt_diff_entries_count);
915 /* check whether this new OGM has no changes due to size problems */
916 if (tt_diff_entries_count > 0) {
917 /* if kmalloc() fails we will reply with the full table
918 * instead of providing the diff
920 bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
921 if (bat_priv->tt.last_changeset) {
922 memcpy(bat_priv->tt.last_changeset,
923 tt_change, tt_change_len);
924 bat_priv->tt.last_changeset_len = tt_diff_len;
927 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
930 batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
935 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
937 struct net_device *net_dev = (struct net_device *)seq->private;
938 struct batadv_priv *bat_priv = netdev_priv(net_dev);
939 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
940 struct batadv_tt_common_entry *tt_common_entry;
941 struct batadv_tt_local_entry *tt_local;
942 struct batadv_hard_iface *primary_if;
943 struct batadv_softif_vlan *vlan;
944 struct hlist_head *head;
949 unsigned long last_seen_jiffies;
951 u16 np_flag = BATADV_TT_CLIENT_NOPURGE;
953 primary_if = batadv_seq_print_text_primary_if_get(seq);
958 "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
959 net_dev->name, (u8)atomic_read(&bat_priv->tt.vn));
960 seq_printf(seq, " %-13s %s %-8s %-9s (%-10s)\n", "Client", "VID",
961 "Flags", "Last seen", "CRC");
963 for (i = 0; i < hash->size; i++) {
964 head = &hash->table[i];
967 hlist_for_each_entry_rcu(tt_common_entry,
969 tt_local = container_of(tt_common_entry,
970 struct batadv_tt_local_entry,
972 vid = tt_common_entry->vid;
973 last_seen_jiffies = jiffies - tt_local->last_seen;
974 last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
975 last_seen_secs = last_seen_msecs / 1000;
976 last_seen_msecs = last_seen_msecs % 1000;
978 no_purge = tt_common_entry->flags & np_flag;
980 vlan = batadv_softif_vlan_get(bat_priv, vid);
982 seq_printf(seq, "Cannot retrieve VLAN %d\n",
983 BATADV_PRINT_VID(vid));
988 " * %pM %4i [%c%c%c%c%c%c] %3u.%03u (%#.8x)\n",
989 tt_common_entry->addr,
990 BATADV_PRINT_VID(tt_common_entry->vid),
991 ((tt_common_entry->flags &
992 BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
993 no_purge ? 'P' : '.',
994 ((tt_common_entry->flags &
995 BATADV_TT_CLIENT_NEW) ? 'N' : '.'),
996 ((tt_common_entry->flags &
997 BATADV_TT_CLIENT_PENDING) ? 'X' : '.'),
998 ((tt_common_entry->flags &
999 BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1000 ((tt_common_entry->flags &
1001 BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1002 no_purge ? 0 : last_seen_secs,
1003 no_purge ? 0 : last_seen_msecs,
1006 batadv_softif_vlan_free_ref(vlan);
1012 batadv_hardif_free_ref(primary_if);
1017 batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
1018 struct batadv_tt_local_entry *tt_local_entry,
1019 u16 flags, const char *message)
1021 batadv_tt_local_event(bat_priv, tt_local_entry, flags);
1023 /* The local client has to be marked as "pending to be removed" but has
1024 * to be kept in the table in order to send it in a full table
1025 * response issued before the net ttvn increment (consistency check)
1027 tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
1029 batadv_dbg(BATADV_DBG_TT, bat_priv,
1030 "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
1031 tt_local_entry->common.addr,
1032 BATADV_PRINT_VID(tt_local_entry->common.vid), message);
1036 * batadv_tt_local_remove - logically remove an entry from the local table
1037 * @bat_priv: the bat priv with all the soft interface information
1038 * @addr: the MAC address of the client to remove
1039 * @vid: VLAN identifier
1040 * @message: message to append to the log on deletion
1041 * @roaming: true if the deletion is due to a roaming event
1043 * Returns the flags assigned to the local entry before being deleted
1045 u16 batadv_tt_local_remove(struct batadv_priv *bat_priv, const u8 *addr,
1046 unsigned short vid, const char *message,
1049 struct batadv_tt_local_entry *tt_local_entry;
1050 u16 flags, curr_flags = BATADV_NO_FLAGS;
1051 struct batadv_softif_vlan *vlan;
1052 void *tt_entry_exists;
1054 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
1055 if (!tt_local_entry)
1058 curr_flags = tt_local_entry->common.flags;
1060 flags = BATADV_TT_CLIENT_DEL;
1061 /* if this global entry addition is due to a roaming, the node has to
1062 * mark the local entry as "roamed" in order to correctly reroute
1066 flags |= BATADV_TT_CLIENT_ROAM;
1067 /* mark the local client as ROAMed */
1068 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1071 if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
1072 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
1076 /* if this client has been added right now, it is possible to
1077 * immediately purge it
1079 batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL);
1081 tt_entry_exists = batadv_hash_remove(bat_priv->tt.local_hash,
1084 &tt_local_entry->common);
1085 if (!tt_entry_exists)
1088 /* extra call to free the local tt entry */
1089 batadv_tt_local_entry_free_ref(tt_local_entry);
1091 /* decrease the reference held for this vlan */
1092 vlan = batadv_softif_vlan_get(bat_priv, vid);
1096 batadv_softif_vlan_free_ref(vlan);
1097 batadv_softif_vlan_free_ref(vlan);
1101 batadv_tt_local_entry_free_ref(tt_local_entry);
1107 * batadv_tt_local_purge_list - purge inactive tt local entries
1108 * @bat_priv: the bat priv with all the soft interface information
1109 * @head: pointer to the list containing the local tt entries
1110 * @timeout: parameter deciding whether a given tt local entry is considered
1113 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
1114 struct hlist_head *head,
1117 struct batadv_tt_local_entry *tt_local_entry;
1118 struct batadv_tt_common_entry *tt_common_entry;
1119 struct hlist_node *node_tmp;
1121 hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
1123 tt_local_entry = container_of(tt_common_entry,
1124 struct batadv_tt_local_entry,
1126 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
1129 /* entry already marked for deletion */
1130 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
1133 if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout))
1136 batadv_tt_local_set_pending(bat_priv, tt_local_entry,
1137 BATADV_TT_CLIENT_DEL, "timed out");
1142 * batadv_tt_local_purge - purge inactive tt local entries
1143 * @bat_priv: the bat priv with all the soft interface information
1144 * @timeout: parameter deciding whether a given tt local entry is considered
1147 static void batadv_tt_local_purge(struct batadv_priv *bat_priv,
1150 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1151 struct hlist_head *head;
1152 spinlock_t *list_lock; /* protects write access to the hash lists */
1155 for (i = 0; i < hash->size; i++) {
1156 head = &hash->table[i];
1157 list_lock = &hash->list_locks[i];
1159 spin_lock_bh(list_lock);
1160 batadv_tt_local_purge_list(bat_priv, head, timeout);
1161 spin_unlock_bh(list_lock);
1165 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
1167 struct batadv_hashtable *hash;
1168 spinlock_t *list_lock; /* protects write access to the hash lists */
1169 struct batadv_tt_common_entry *tt_common_entry;
1170 struct batadv_tt_local_entry *tt_local;
1171 struct batadv_softif_vlan *vlan;
1172 struct hlist_node *node_tmp;
1173 struct hlist_head *head;
1176 if (!bat_priv->tt.local_hash)
1179 hash = bat_priv->tt.local_hash;
1181 for (i = 0; i < hash->size; i++) {
1182 head = &hash->table[i];
1183 list_lock = &hash->list_locks[i];
1185 spin_lock_bh(list_lock);
1186 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1188 hlist_del_rcu(&tt_common_entry->hash_entry);
1189 tt_local = container_of(tt_common_entry,
1190 struct batadv_tt_local_entry,
1193 /* decrease the reference held for this vlan */
1194 vlan = batadv_softif_vlan_get(bat_priv,
1195 tt_common_entry->vid);
1197 batadv_softif_vlan_free_ref(vlan);
1198 batadv_softif_vlan_free_ref(vlan);
1201 batadv_tt_local_entry_free_ref(tt_local);
1203 spin_unlock_bh(list_lock);
1206 batadv_hash_destroy(hash);
1208 bat_priv->tt.local_hash = NULL;
1211 static int batadv_tt_global_init(struct batadv_priv *bat_priv)
1213 if (bat_priv->tt.global_hash)
1216 bat_priv->tt.global_hash = batadv_hash_new(1024);
1218 if (!bat_priv->tt.global_hash)
1221 batadv_hash_set_lock_class(bat_priv->tt.global_hash,
1222 &batadv_tt_global_hash_lock_class_key);
1227 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
1229 struct batadv_tt_change_node *entry, *safe;
1231 spin_lock_bh(&bat_priv->tt.changes_list_lock);
1233 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1235 list_del(&entry->list);
1239 atomic_set(&bat_priv->tt.local_changes, 0);
1240 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1243 /* retrieves the orig_tt_list_entry belonging to orig_node from the
1244 * batadv_tt_global_entry list
1246 * returns it with an increased refcounter, NULL if not found
1248 static struct batadv_tt_orig_list_entry *
1249 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
1250 const struct batadv_orig_node *orig_node)
1252 struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
1253 const struct hlist_head *head;
1256 head = &entry->orig_list;
1257 hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
1258 if (tmp_orig_entry->orig_node != orig_node)
1260 if (!atomic_inc_not_zero(&tmp_orig_entry->refcount))
1263 orig_entry = tmp_orig_entry;
1271 /* find out if an orig_node is already in the list of a tt_global_entry.
1272 * returns true if found, false otherwise
1275 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
1276 const struct batadv_orig_node *orig_node)
1278 struct batadv_tt_orig_list_entry *orig_entry;
1281 orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
1284 batadv_tt_orig_list_entry_free_ref(orig_entry);
1291 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
1292 struct batadv_orig_node *orig_node, int ttvn)
1294 struct batadv_tt_orig_list_entry *orig_entry;
1296 orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
1298 /* refresh the ttvn: the current value could be a bogus one that
1299 * was added during a "temporary client detection"
1301 orig_entry->ttvn = ttvn;
1305 orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
1309 INIT_HLIST_NODE(&orig_entry->list);
1310 atomic_inc(&orig_node->refcount);
1311 batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
1312 orig_entry->orig_node = orig_node;
1313 orig_entry->ttvn = ttvn;
1314 atomic_set(&orig_entry->refcount, 2);
1316 spin_lock_bh(&tt_global->list_lock);
1317 hlist_add_head_rcu(&orig_entry->list,
1318 &tt_global->orig_list);
1319 spin_unlock_bh(&tt_global->list_lock);
1320 atomic_inc(&tt_global->orig_list_count);
1324 batadv_tt_orig_list_entry_free_ref(orig_entry);
1328 * batadv_tt_global_add - add a new TT global entry or update an existing one
1329 * @bat_priv: the bat priv with all the soft interface information
1330 * @orig_node: the originator announcing the client
1331 * @tt_addr: the mac address of the non-mesh client
1332 * @vid: VLAN identifier
1333 * @flags: TT flags that have to be set for this non-mesh client
1334 * @ttvn: the tt version number ever announcing this non-mesh client
1336 * Add a new TT global entry for the given originator. If the entry already
1337 * exists add a new reference to the given originator (a global entry can have
1338 * references to multiple originators) and adjust the flags attribute to reflect
1339 * the function argument.
1340 * If a TT local entry exists for this non-mesh client remove it.
1342 * The caller must hold orig_node refcount.
1344 * Return true if the new entry has been added, false otherwise
1346 static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
1347 struct batadv_orig_node *orig_node,
1348 const unsigned char *tt_addr,
1349 unsigned short vid, u16 flags, u8 ttvn)
1351 struct batadv_tt_global_entry *tt_global_entry;
1352 struct batadv_tt_local_entry *tt_local_entry;
1355 struct batadv_tt_common_entry *common;
1358 /* ignore global entries from backbone nodes */
1359 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
1362 tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
1363 tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
1365 /* if the node already has a local client for this entry, it has to wait
1366 * for a roaming advertisement instead of manually messing up the global
1369 if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
1370 !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
1373 if (!tt_global_entry) {
1374 tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
1375 if (!tt_global_entry)
1378 common = &tt_global_entry->common;
1379 ether_addr_copy(common->addr, tt_addr);
1382 common->flags = flags;
1383 tt_global_entry->roam_at = 0;
1384 /* node must store current time in case of roaming. This is
1385 * needed to purge this entry out on timeout (if nobody claims
1388 if (flags & BATADV_TT_CLIENT_ROAM)
1389 tt_global_entry->roam_at = jiffies;
1390 atomic_set(&common->refcount, 2);
1391 common->added_at = jiffies;
1393 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
1394 atomic_set(&tt_global_entry->orig_list_count, 0);
1395 spin_lock_init(&tt_global_entry->list_lock);
1397 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
1399 batadv_choose_tt, common,
1400 &common->hash_entry);
1402 if (unlikely(hash_added != 0)) {
1403 /* remove the reference for the hash */
1404 batadv_tt_global_entry_free_ref(tt_global_entry);
1408 common = &tt_global_entry->common;
1409 /* If there is already a global entry, we can use this one for
1411 * But if we are trying to add a temporary client then here are
1412 * two options at this point:
1413 * 1) the global client is not a temporary client: the global
1414 * client has to be left as it is, temporary information
1415 * should never override any already known client state
1416 * 2) the global client is a temporary client: purge the
1417 * originator list and add the new one orig_entry
1419 if (flags & BATADV_TT_CLIENT_TEMP) {
1420 if (!(common->flags & BATADV_TT_CLIENT_TEMP))
1422 if (batadv_tt_global_entry_has_orig(tt_global_entry,
1425 batadv_tt_global_del_orig_list(tt_global_entry);
1426 goto add_orig_entry;
1429 /* if the client was temporary added before receiving the first
1430 * OGM announcing it, we have to clear the TEMP flag
1432 common->flags &= ~BATADV_TT_CLIENT_TEMP;
1434 /* the change can carry possible "attribute" flags like the
1435 * TT_CLIENT_WIFI, therefore they have to be copied in the
1438 tt_global_entry->common.flags |= flags;
1440 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1441 * one originator left in the list and we previously received a
1442 * delete + roaming change for this originator.
1444 * We should first delete the old originator before adding the
1447 if (common->flags & BATADV_TT_CLIENT_ROAM) {
1448 batadv_tt_global_del_orig_list(tt_global_entry);
1449 common->flags &= ~BATADV_TT_CLIENT_ROAM;
1450 tt_global_entry->roam_at = 0;
1454 /* add the new orig_entry (if needed) or update it */
1455 batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);
1457 batadv_dbg(BATADV_DBG_TT, bat_priv,
1458 "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1459 common->addr, BATADV_PRINT_VID(common->vid),
1464 /* Do not remove multicast addresses from the local hash on
1467 if (is_multicast_ether_addr(tt_addr))
1470 /* remove address from local hash if present */
1471 local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
1472 "global tt received",
1473 flags & BATADV_TT_CLIENT_ROAM);
1474 tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
1476 if (!(flags & BATADV_TT_CLIENT_ROAM))
1477 /* this is a normal global add. Therefore the client is not in a
1478 * roaming state anymore.
1480 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
1483 if (tt_global_entry)
1484 batadv_tt_global_entry_free_ref(tt_global_entry);
1486 batadv_tt_local_entry_free_ref(tt_local_entry);
1491 * batadv_transtable_best_orig - Get best originator list entry from tt entry
1492 * @bat_priv: the bat priv with all the soft interface information
1493 * @tt_global_entry: global translation table entry to be analyzed
1495 * This functon assumes the caller holds rcu_read_lock().
1496 * Returns best originator list entry or NULL on errors.
1498 static struct batadv_tt_orig_list_entry *
1499 batadv_transtable_best_orig(struct batadv_priv *bat_priv,
1500 struct batadv_tt_global_entry *tt_global_entry)
1502 struct batadv_neigh_node *router, *best_router = NULL;
1503 struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1504 struct hlist_head *head;
1505 struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
1507 head = &tt_global_entry->orig_list;
1508 hlist_for_each_entry_rcu(orig_entry, head, list) {
1509 router = batadv_orig_router_get(orig_entry->orig_node,
1515 bao->bat_neigh_cmp(router, BATADV_IF_DEFAULT,
1516 best_router, BATADV_IF_DEFAULT) <= 0) {
1517 batadv_neigh_node_free_ref(router);
1521 /* release the refcount for the "old" best */
1523 batadv_neigh_node_free_ref(best_router);
1525 best_entry = orig_entry;
1526 best_router = router;
1530 batadv_neigh_node_free_ref(best_router);
1536 * batadv_tt_global_print_entry - print all orig nodes who announce the address
1537 * for this global entry
1538 * @bat_priv: the bat priv with all the soft interface information
1539 * @tt_global_entry: global translation table entry to be printed
1540 * @seq: debugfs table seq_file struct
1542 * This functon assumes the caller holds rcu_read_lock().
1545 batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
1546 struct batadv_tt_global_entry *tt_global_entry,
1547 struct seq_file *seq)
1549 struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
1550 struct batadv_tt_common_entry *tt_common_entry;
1551 struct batadv_orig_node_vlan *vlan;
1552 struct hlist_head *head;
1556 tt_common_entry = &tt_global_entry->common;
1557 flags = tt_common_entry->flags;
1559 best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1561 vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
1562 tt_common_entry->vid);
1565 " * Cannot retrieve VLAN %d for originator %pM\n",
1566 BATADV_PRINT_VID(tt_common_entry->vid),
1567 best_entry->orig_node->orig);
1571 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
1573 " %c %pM %4i (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
1574 '*', tt_global_entry->common.addr,
1575 BATADV_PRINT_VID(tt_global_entry->common.vid),
1576 best_entry->ttvn, best_entry->orig_node->orig,
1577 last_ttvn, vlan->tt.crc,
1578 ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1579 ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1580 ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1581 ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1583 batadv_orig_node_vlan_free_ref(vlan);
1587 head = &tt_global_entry->orig_list;
1589 hlist_for_each_entry_rcu(orig_entry, head, list) {
1590 if (best_entry == orig_entry)
1593 vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
1594 tt_common_entry->vid);
1597 " + Cannot retrieve VLAN %d for originator %pM\n",
1598 BATADV_PRINT_VID(tt_common_entry->vid),
1599 orig_entry->orig_node->orig);
1603 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
1605 " %c %pM %4d (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
1606 '+', tt_global_entry->common.addr,
1607 BATADV_PRINT_VID(tt_global_entry->common.vid),
1608 orig_entry->ttvn, orig_entry->orig_node->orig,
1609 last_ttvn, vlan->tt.crc,
1610 ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1611 ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1612 ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1613 ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1615 batadv_orig_node_vlan_free_ref(vlan);
1619 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
1621 struct net_device *net_dev = (struct net_device *)seq->private;
1622 struct batadv_priv *bat_priv = netdev_priv(net_dev);
1623 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1624 struct batadv_tt_common_entry *tt_common_entry;
1625 struct batadv_tt_global_entry *tt_global;
1626 struct batadv_hard_iface *primary_if;
1627 struct hlist_head *head;
1630 primary_if = batadv_seq_print_text_primary_if_get(seq);
1635 "Globally announced TT entries received via the mesh %s\n",
1637 seq_printf(seq, " %-13s %s %s %-15s %s (%-10s) %s\n",
1638 "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1641 for (i = 0; i < hash->size; i++) {
1642 head = &hash->table[i];
1645 hlist_for_each_entry_rcu(tt_common_entry,
1647 tt_global = container_of(tt_common_entry,
1648 struct batadv_tt_global_entry,
1650 batadv_tt_global_print_entry(bat_priv, tt_global, seq);
1656 batadv_hardif_free_ref(primary_if);
1661 * _batadv_tt_global_del_orig_entry - remove and free an orig_entry
1662 * @tt_global_entry: the global entry to remove the orig_entry from
1663 * @orig_entry: the orig entry to remove and free
1665 * Remove an orig_entry from its list in the given tt_global_entry and
1666 * free this orig_entry afterwards.
1668 * Caller must hold tt_global_entry->list_lock and ensure orig_entry->list is
1672 _batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
1673 struct batadv_tt_orig_list_entry *orig_entry)
1675 lockdep_assert_held(&tt_global_entry->list_lock);
1677 batadv_tt_global_size_dec(orig_entry->orig_node,
1678 tt_global_entry->common.vid);
1679 atomic_dec(&tt_global_entry->orig_list_count);
1680 /* requires holding tt_global_entry->list_lock and orig_entry->list
1681 * being part of a list
1683 hlist_del_rcu(&orig_entry->list);
1684 batadv_tt_orig_list_entry_free_ref(orig_entry);
1687 /* deletes the orig list of a tt_global_entry */
1689 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
1691 struct hlist_head *head;
1692 struct hlist_node *safe;
1693 struct batadv_tt_orig_list_entry *orig_entry;
1695 spin_lock_bh(&tt_global_entry->list_lock);
1696 head = &tt_global_entry->orig_list;
1697 hlist_for_each_entry_safe(orig_entry, safe, head, list)
1698 _batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
1699 spin_unlock_bh(&tt_global_entry->list_lock);
1703 * batadv_tt_global_del_orig_node - remove orig_node from a global tt entry
1704 * @bat_priv: the bat priv with all the soft interface information
1705 * @tt_global_entry: the global entry to remove the orig_node from
1706 * @orig_node: the originator announcing the client
1707 * @message: message to append to the log on deletion
1709 * Remove the given orig_node and its according orig_entry from the given
1713 batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
1714 struct batadv_tt_global_entry *tt_global_entry,
1715 struct batadv_orig_node *orig_node,
1716 const char *message)
1718 struct hlist_head *head;
1719 struct hlist_node *safe;
1720 struct batadv_tt_orig_list_entry *orig_entry;
1723 spin_lock_bh(&tt_global_entry->list_lock);
1724 head = &tt_global_entry->orig_list;
1725 hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1726 if (orig_entry->orig_node == orig_node) {
1727 vid = tt_global_entry->common.vid;
1728 batadv_dbg(BATADV_DBG_TT, bat_priv,
1729 "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1731 tt_global_entry->common.addr,
1732 BATADV_PRINT_VID(vid), message);
1733 _batadv_tt_global_del_orig_entry(tt_global_entry,
1737 spin_unlock_bh(&tt_global_entry->list_lock);
1740 /* If the client is to be deleted, we check if it is the last origantor entry
1741 * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1742 * timer, otherwise we simply remove the originator scheduled for deletion.
1745 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
1746 struct batadv_tt_global_entry *tt_global_entry,
1747 struct batadv_orig_node *orig_node,
1748 const char *message)
1750 bool last_entry = true;
1751 struct hlist_head *head;
1752 struct batadv_tt_orig_list_entry *orig_entry;
1754 /* no local entry exists, case 1:
1755 * Check if this is the last one or if other entries exist.
1759 head = &tt_global_entry->orig_list;
1760 hlist_for_each_entry_rcu(orig_entry, head, list) {
1761 if (orig_entry->orig_node != orig_node) {
1769 /* its the last one, mark for roaming. */
1770 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1771 tt_global_entry->roam_at = jiffies;
1773 /* there is another entry, we can simply delete this
1774 * one and can still use the other one.
1776 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
1777 orig_node, message);
1781 * batadv_tt_global_del - remove a client from the global table
1782 * @bat_priv: the bat priv with all the soft interface information
1783 * @orig_node: an originator serving this client
1784 * @addr: the mac address of the client
1785 * @vid: VLAN identifier
1786 * @message: a message explaining the reason for deleting the client to print
1787 * for debugging purpose
1788 * @roaming: true if the deletion has been triggered by a roaming event
1790 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
1791 struct batadv_orig_node *orig_node,
1792 const unsigned char *addr, unsigned short vid,
1793 const char *message, bool roaming)
1795 struct batadv_tt_global_entry *tt_global_entry;
1796 struct batadv_tt_local_entry *local_entry = NULL;
1798 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1799 if (!tt_global_entry)
1803 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
1804 orig_node, message);
1806 if (hlist_empty(&tt_global_entry->orig_list))
1807 batadv_tt_global_free(bat_priv, tt_global_entry,
1813 /* if we are deleting a global entry due to a roam
1814 * event, there are two possibilities:
1815 * 1) the client roamed from node A to node B => if there
1816 * is only one originator left for this client, we mark
1817 * it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1818 * wait for node B to claim it. In case of timeout
1819 * the entry is purged.
1821 * If there are other originators left, we directly delete
1823 * 2) the client roamed to us => we can directly delete
1824 * the global entry, since it is useless now.
1826 local_entry = batadv_tt_local_hash_find(bat_priv,
1827 tt_global_entry->common.addr,
1830 /* local entry exists, case 2: client roamed to us. */
1831 batadv_tt_global_del_orig_list(tt_global_entry);
1832 batadv_tt_global_free(bat_priv, tt_global_entry, message);
1834 /* no local entry exists, case 1: check for roaming */
1835 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
1836 orig_node, message);
1839 if (tt_global_entry)
1840 batadv_tt_global_entry_free_ref(tt_global_entry);
1842 batadv_tt_local_entry_free_ref(local_entry);
1846 * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1847 * given originator matching the provided vid
1848 * @bat_priv: the bat priv with all the soft interface information
1849 * @orig_node: the originator owning the entries to remove
1850 * @match_vid: the VLAN identifier to match. If negative all the entries will be
1852 * @message: debug message to print as "reason"
1854 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
1855 struct batadv_orig_node *orig_node,
1857 const char *message)
1859 struct batadv_tt_global_entry *tt_global;
1860 struct batadv_tt_common_entry *tt_common_entry;
1862 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1863 struct hlist_node *safe;
1864 struct hlist_head *head;
1865 spinlock_t *list_lock; /* protects write access to the hash lists */
1871 for (i = 0; i < hash->size; i++) {
1872 head = &hash->table[i];
1873 list_lock = &hash->list_locks[i];
1875 spin_lock_bh(list_lock);
1876 hlist_for_each_entry_safe(tt_common_entry, safe,
1878 /* remove only matching entries */
1879 if (match_vid >= 0 && tt_common_entry->vid != match_vid)
1882 tt_global = container_of(tt_common_entry,
1883 struct batadv_tt_global_entry,
1886 batadv_tt_global_del_orig_node(bat_priv, tt_global,
1887 orig_node, message);
1889 if (hlist_empty(&tt_global->orig_list)) {
1890 vid = tt_global->common.vid;
1891 batadv_dbg(BATADV_DBG_TT, bat_priv,
1892 "Deleting global tt entry %pM (vid: %d): %s\n",
1893 tt_global->common.addr,
1894 BATADV_PRINT_VID(vid), message);
1895 hlist_del_rcu(&tt_common_entry->hash_entry);
1896 batadv_tt_global_entry_free_ref(tt_global);
1899 spin_unlock_bh(list_lock);
1901 clear_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
1904 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
1908 unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
1909 unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
1911 if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
1912 batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
1914 *msg = "Roaming timeout\n";
1917 if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
1918 batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
1920 *msg = "Temporary client timeout\n";
1926 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
1928 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1929 struct hlist_head *head;
1930 struct hlist_node *node_tmp;
1931 spinlock_t *list_lock; /* protects write access to the hash lists */
1934 struct batadv_tt_common_entry *tt_common;
1935 struct batadv_tt_global_entry *tt_global;
1937 for (i = 0; i < hash->size; i++) {
1938 head = &hash->table[i];
1939 list_lock = &hash->list_locks[i];
1941 spin_lock_bh(list_lock);
1942 hlist_for_each_entry_safe(tt_common, node_tmp, head,
1944 tt_global = container_of(tt_common,
1945 struct batadv_tt_global_entry,
1948 if (!batadv_tt_global_to_purge(tt_global, &msg))
1951 batadv_dbg(BATADV_DBG_TT, bat_priv,
1952 "Deleting global tt entry %pM (vid: %d): %s\n",
1953 tt_global->common.addr,
1954 BATADV_PRINT_VID(tt_global->common.vid),
1957 hlist_del_rcu(&tt_common->hash_entry);
1959 batadv_tt_global_entry_free_ref(tt_global);
1961 spin_unlock_bh(list_lock);
1965 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
1967 struct batadv_hashtable *hash;
1968 spinlock_t *list_lock; /* protects write access to the hash lists */
1969 struct batadv_tt_common_entry *tt_common_entry;
1970 struct batadv_tt_global_entry *tt_global;
1971 struct hlist_node *node_tmp;
1972 struct hlist_head *head;
1975 if (!bat_priv->tt.global_hash)
1978 hash = bat_priv->tt.global_hash;
1980 for (i = 0; i < hash->size; i++) {
1981 head = &hash->table[i];
1982 list_lock = &hash->list_locks[i];
1984 spin_lock_bh(list_lock);
1985 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1987 hlist_del_rcu(&tt_common_entry->hash_entry);
1988 tt_global = container_of(tt_common_entry,
1989 struct batadv_tt_global_entry,
1991 batadv_tt_global_entry_free_ref(tt_global);
1993 spin_unlock_bh(list_lock);
1996 batadv_hash_destroy(hash);
1998 bat_priv->tt.global_hash = NULL;
2002 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
2003 struct batadv_tt_global_entry *tt_global_entry)
2007 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
2008 tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
2011 /* check if the two clients are marked as isolated */
2012 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
2013 tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
2020 * batadv_transtable_search - get the mesh destination for a given client
2021 * @bat_priv: the bat priv with all the soft interface information
2022 * @src: mac address of the source client
2023 * @addr: mac address of the destination client
2024 * @vid: VLAN identifier
2026 * Returns a pointer to the originator that was selected as destination in the
2027 * mesh for contacting the client 'addr', NULL otherwise.
2028 * In case of multiple originators serving the same client, the function returns
2029 * the best one (best in terms of metric towards the destination node).
2031 * If the two clients are AP isolated the function returns NULL.
2033 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
2038 struct batadv_tt_local_entry *tt_local_entry = NULL;
2039 struct batadv_tt_global_entry *tt_global_entry = NULL;
2040 struct batadv_orig_node *orig_node = NULL;
2041 struct batadv_tt_orig_list_entry *best_entry;
2043 if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) {
2044 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
2045 if (!tt_local_entry ||
2046 (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
2050 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
2051 if (!tt_global_entry)
2054 /* check whether the clients should not communicate due to AP
2057 if (tt_local_entry &&
2058 _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
2062 best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
2063 /* found anything? */
2065 orig_node = best_entry->orig_node;
2066 if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
2071 if (tt_global_entry)
2072 batadv_tt_global_entry_free_ref(tt_global_entry);
2074 batadv_tt_local_entry_free_ref(tt_local_entry);
2080 * batadv_tt_global_crc - calculates the checksum of the local table belonging
2081 * to the given orig_node
2082 * @bat_priv: the bat priv with all the soft interface information
2083 * @orig_node: originator for which the CRC should be computed
2084 * @vid: VLAN identifier for which the CRC32 has to be computed
2086 * This function computes the checksum for the global table corresponding to a
2087 * specific originator. In particular, the checksum is computed as follows: For
2088 * each client connected to the originator the CRC32C of the MAC address and the
2089 * VID is computed and then all the CRC32Cs of the various clients are xor'ed
2092 * The idea behind is that CRC32C should be used as much as possible in order to
2093 * produce a unique hash of the table, but since the order which is used to feed
2094 * the CRC32C function affects the result and since every node in the network
2095 * probably sorts the clients differently, the hash function cannot be directly
2096 * computed over the entire table. Hence the CRC32C is used only on
2097 * the single client entry, while all the results are then xor'ed together
2098 * because the XOR operation can combine them all while trying to reduce the
2099 * noise as much as possible.
2101 * Returns the checksum of the global table of a given originator.
2103 static u32 batadv_tt_global_crc(struct batadv_priv *bat_priv,
2104 struct batadv_orig_node *orig_node,
2107 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2108 struct batadv_tt_common_entry *tt_common;
2109 struct batadv_tt_global_entry *tt_global;
2110 struct hlist_head *head;
2111 u32 i, crc_tmp, crc = 0;
2115 for (i = 0; i < hash->size; i++) {
2116 head = &hash->table[i];
2119 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2120 tt_global = container_of(tt_common,
2121 struct batadv_tt_global_entry,
2123 /* compute the CRC only for entries belonging to the
2124 * VLAN identified by the vid passed as parameter
2126 if (tt_common->vid != vid)
2129 /* Roaming clients are in the global table for
2130 * consistency only. They don't have to be
2131 * taken into account while computing the
2134 if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
2136 /* Temporary clients have not been announced yet, so
2137 * they have to be skipped while computing the global
2140 if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
2143 /* find out if this global entry is announced by this
2146 if (!batadv_tt_global_entry_has_orig(tt_global,
2150 /* use network order to read the VID: this ensures that
2151 * every node reads the bytes in the same order.
2153 tmp_vid = htons(tt_common->vid);
2154 crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2156 /* compute the CRC on flags that have to be kept in sync
2159 flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2160 crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2162 crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2171 * batadv_tt_local_crc - calculates the checksum of the local table
2172 * @bat_priv: the bat priv with all the soft interface information
2173 * @vid: VLAN identifier for which the CRC32 has to be computed
2175 * For details about the computation, please refer to the documentation for
2176 * batadv_tt_global_crc().
2178 * Returns the checksum of the local table
2180 static u32 batadv_tt_local_crc(struct batadv_priv *bat_priv,
2183 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2184 struct batadv_tt_common_entry *tt_common;
2185 struct hlist_head *head;
2186 u32 i, crc_tmp, crc = 0;
2190 for (i = 0; i < hash->size; i++) {
2191 head = &hash->table[i];
2194 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2195 /* compute the CRC only for entries belonging to the
2196 * VLAN identified by vid
2198 if (tt_common->vid != vid)
2201 /* not yet committed clients have not to be taken into
2202 * account while computing the CRC
2204 if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2207 /* use network order to read the VID: this ensures that
2208 * every node reads the bytes in the same order.
2210 tmp_vid = htons(tt_common->vid);
2211 crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2213 /* compute the CRC on flags that have to be kept in sync
2216 flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2217 crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2219 crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2227 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2229 struct batadv_tt_req_node *node;
2230 struct hlist_node *safe;
2232 spin_lock_bh(&bat_priv->tt.req_list_lock);
2234 hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2235 hlist_del_init(&node->list);
2239 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2242 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2243 struct batadv_orig_node *orig_node,
2244 const void *tt_buff,
2247 /* Replace the old buffer only if I received something in the
2248 * last OGM (the OGM could carry no changes)
2250 spin_lock_bh(&orig_node->tt_buff_lock);
2251 if (tt_buff_len > 0) {
2252 kfree(orig_node->tt_buff);
2253 orig_node->tt_buff_len = 0;
2254 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2255 if (orig_node->tt_buff) {
2256 memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2257 orig_node->tt_buff_len = tt_buff_len;
2260 spin_unlock_bh(&orig_node->tt_buff_lock);
2263 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2265 struct batadv_tt_req_node *node;
2266 struct hlist_node *safe;
2268 spin_lock_bh(&bat_priv->tt.req_list_lock);
2269 hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2270 if (batadv_has_timed_out(node->issued_at,
2271 BATADV_TT_REQUEST_TIMEOUT)) {
2272 hlist_del_init(&node->list);
2276 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2280 * batadv_tt_req_node_new - search and possibly create a tt_req_node object
2281 * @bat_priv: the bat priv with all the soft interface information
2282 * @orig_node: orig node this request is being issued for
2284 * Returns the pointer to the new tt_req_node struct if no request
2285 * has already been issued for this orig_node, NULL otherwise.
2287 static struct batadv_tt_req_node *
2288 batadv_tt_req_node_new(struct batadv_priv *bat_priv,
2289 struct batadv_orig_node *orig_node)
2291 struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2293 spin_lock_bh(&bat_priv->tt.req_list_lock);
2294 hlist_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2295 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2296 !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2297 BATADV_TT_REQUEST_TIMEOUT))
2301 tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
2305 ether_addr_copy(tt_req_node->addr, orig_node->orig);
2306 tt_req_node->issued_at = jiffies;
2308 hlist_add_head(&tt_req_node->list, &bat_priv->tt.req_list);
2310 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2315 * batadv_tt_local_valid - verify that given tt entry is a valid one
2316 * @entry_ptr: to be checked local tt entry
2317 * @data_ptr: not used but definition required to satisfy the callback prototype
2319 * Returns 1 if the entry is a valid, 0 otherwise.
2321 static int batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
2323 const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2325 if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2330 static int batadv_tt_global_valid(const void *entry_ptr,
2331 const void *data_ptr)
2333 const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2334 const struct batadv_tt_global_entry *tt_global_entry;
2335 const struct batadv_orig_node *orig_node = data_ptr;
2337 if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2338 tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2341 tt_global_entry = container_of(tt_common_entry,
2342 struct batadv_tt_global_entry,
2345 return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
2349 * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2351 * @bat_priv: the bat priv with all the soft interface information
2352 * @hash: hash table containing the tt entries
2353 * @tt_len: expected tvlv tt data buffer length in number of bytes
2354 * @tvlv_buff: pointer to the buffer to fill with the TT data
2355 * @valid_cb: function to filter tt change entries
2356 * @cb_data: data passed to the filter function as argument
2358 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2359 struct batadv_hashtable *hash,
2360 void *tvlv_buff, u16 tt_len,
2361 int (*valid_cb)(const void *, const void *),
2364 struct batadv_tt_common_entry *tt_common_entry;
2365 struct batadv_tvlv_tt_change *tt_change;
2366 struct hlist_head *head;
2367 u16 tt_tot, tt_num_entries = 0;
2370 tt_tot = batadv_tt_entries(tt_len);
2371 tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
2374 for (i = 0; i < hash->size; i++) {
2375 head = &hash->table[i];
2377 hlist_for_each_entry_rcu(tt_common_entry,
2379 if (tt_tot == tt_num_entries)
2382 if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
2385 ether_addr_copy(tt_change->addr, tt_common_entry->addr);
2386 tt_change->flags = tt_common_entry->flags;
2387 tt_change->vid = htons(tt_common_entry->vid);
2388 memset(tt_change->reserved, 0,
2389 sizeof(tt_change->reserved));
2399 * batadv_tt_global_check_crc - check if all the CRCs are correct
2400 * @orig_node: originator for which the CRCs have to be checked
2401 * @tt_vlan: pointer to the first tvlv VLAN entry
2402 * @num_vlan: number of tvlv VLAN entries
2403 * @create: if true, create VLAN objects if not found
2405 * Return true if all the received CRCs match the locally stored ones, false
2408 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
2409 struct batadv_tvlv_tt_vlan_data *tt_vlan,
2412 struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
2413 struct batadv_orig_node_vlan *vlan;
2417 /* check if each received CRC matches the locally stored one */
2418 for (i = 0; i < num_vlan; i++) {
2419 tt_vlan_tmp = tt_vlan + i;
2421 /* if orig_node is a backbone node for this VLAN, don't check
2422 * the CRC as we ignore all the global entries over it
2424 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
2426 ntohs(tt_vlan_tmp->vid)))
2429 vlan = batadv_orig_node_vlan_get(orig_node,
2430 ntohs(tt_vlan_tmp->vid));
2435 batadv_orig_node_vlan_free_ref(vlan);
2437 if (crc != ntohl(tt_vlan_tmp->crc))
2445 * batadv_tt_local_update_crc - update all the local CRCs
2446 * @bat_priv: the bat priv with all the soft interface information
2448 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
2450 struct batadv_softif_vlan *vlan;
2452 /* recompute the global CRC for each VLAN */
2454 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
2455 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
2461 * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2462 * @bat_priv: the bat priv with all the soft interface information
2463 * @orig_node: the orig_node for which the CRCs have to be updated
2465 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
2466 struct batadv_orig_node *orig_node)
2468 struct batadv_orig_node_vlan *vlan;
2471 /* recompute the global CRC for each VLAN */
2473 hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
2474 /* if orig_node is a backbone node for this VLAN, don't compute
2475 * the CRC as we ignore all the global entries over it
2477 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
2481 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
2488 * batadv_send_tt_request - send a TT Request message to a given node
2489 * @bat_priv: the bat priv with all the soft interface information
2490 * @dst_orig_node: the destination of the message
2491 * @ttvn: the version number that the source of the message is looking for
2492 * @tt_vlan: pointer to the first tvlv VLAN object to request
2493 * @num_vlan: number of tvlv VLAN entries
2494 * @full_table: ask for the entire translation table if true, while only for the
2495 * last TT diff otherwise
2497 static int batadv_send_tt_request(struct batadv_priv *bat_priv,
2498 struct batadv_orig_node *dst_orig_node,
2500 struct batadv_tvlv_tt_vlan_data *tt_vlan,
2501 u16 num_vlan, bool full_table)
2503 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2504 struct batadv_tt_req_node *tt_req_node = NULL;
2505 struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
2506 struct batadv_hard_iface *primary_if;
2510 primary_if = batadv_primary_if_get_selected(bat_priv);
2514 /* The new tt_req will be issued only if I'm not waiting for a
2515 * reply from the same orig_node yet
2517 tt_req_node = batadv_tt_req_node_new(bat_priv, dst_orig_node);
2521 size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
2522 tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
2526 tvlv_tt_data->flags = BATADV_TT_REQUEST;
2527 tvlv_tt_data->ttvn = ttvn;
2528 tvlv_tt_data->num_vlan = htons(num_vlan);
2530 /* send all the CRCs within the request. This is needed by intermediate
2531 * nodes to ensure they have the correct table before replying
2533 tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
2534 for (i = 0; i < num_vlan; i++) {
2535 tt_vlan_req->vid = tt_vlan->vid;
2536 tt_vlan_req->crc = tt_vlan->crc;
2543 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2545 batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
2546 dst_orig_node->orig, full_table ? 'F' : '.');
2548 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
2549 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2550 dst_orig_node->orig, BATADV_TVLV_TT, 1,
2551 tvlv_tt_data, size);
2556 batadv_hardif_free_ref(primary_if);
2557 if (ret && tt_req_node) {
2558 spin_lock_bh(&bat_priv->tt.req_list_lock);
2559 /* hlist_del_init() verifies tt_req_node still is in the list */
2560 hlist_del_init(&tt_req_node->list);
2561 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2564 kfree(tvlv_tt_data);
2569 * batadv_send_other_tt_response - send reply to tt request concerning another
2570 * node's translation table
2571 * @bat_priv: the bat priv with all the soft interface information
2572 * @tt_data: tt data containing the tt request information
2573 * @req_src: mac address of tt request sender
2574 * @req_dst: mac address of tt request recipient
2576 * Returns true if tt request reply was sent, false otherwise.
2578 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
2579 struct batadv_tvlv_tt_data *tt_data,
2580 u8 *req_src, u8 *req_dst)
2582 struct batadv_orig_node *req_dst_orig_node;
2583 struct batadv_orig_node *res_dst_orig_node = NULL;
2584 struct batadv_tvlv_tt_change *tt_change;
2585 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2586 struct batadv_tvlv_tt_vlan_data *tt_vlan;
2587 bool ret = false, full_table;
2588 u8 orig_ttvn, req_ttvn;
2592 batadv_dbg(BATADV_DBG_TT, bat_priv,
2593 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2594 req_src, tt_data->ttvn, req_dst,
2595 ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2597 /* Let's get the orig node of the REAL destination */
2598 req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
2599 if (!req_dst_orig_node)
2602 res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
2603 if (!res_dst_orig_node)
2606 orig_ttvn = (u8)atomic_read(&req_dst_orig_node->last_ttvn);
2607 req_ttvn = tt_data->ttvn;
2609 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
2610 /* this node doesn't have the requested data */
2611 if (orig_ttvn != req_ttvn ||
2612 !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
2613 ntohs(tt_data->num_vlan)))
2616 /* If the full table has been explicitly requested */
2617 if (tt_data->flags & BATADV_TT_FULL_TABLE ||
2618 !req_dst_orig_node->tt_buff)
2623 /* TT fragmentation hasn't been implemented yet, so send as many
2624 * TT entries fit a single packet as possible only
2627 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
2628 tt_len = req_dst_orig_node->tt_buff_len;
2630 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2637 /* Copy the last orig_node's OGM buffer */
2638 memcpy(tt_change, req_dst_orig_node->tt_buff,
2639 req_dst_orig_node->tt_buff_len);
2640 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2642 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2643 * in the initial part
2646 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2653 /* fill the rest of the tvlv with the real TT entries */
2654 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
2656 batadv_tt_global_valid,
2660 /* Don't send the response, if larger than fragmented packet. */
2661 tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
2662 if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
2663 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
2664 "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
2665 res_dst_orig_node->orig);
2669 tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2670 tvlv_tt_data->ttvn = req_ttvn;
2673 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2675 batadv_dbg(BATADV_DBG_TT, bat_priv,
2676 "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2677 res_dst_orig_node->orig, req_dst_orig_node->orig,
2678 full_table ? 'F' : '.', req_ttvn);
2680 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2682 batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
2683 req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2690 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2693 if (res_dst_orig_node)
2694 batadv_orig_node_free_ref(res_dst_orig_node);
2695 if (req_dst_orig_node)
2696 batadv_orig_node_free_ref(req_dst_orig_node);
2697 kfree(tvlv_tt_data);
2702 * batadv_send_my_tt_response - send reply to tt request concerning this node's
2704 * @bat_priv: the bat priv with all the soft interface information
2705 * @tt_data: tt data containing the tt request information
2706 * @req_src: mac address of tt request sender
2708 * Returns true if tt request reply was sent, false otherwise.
2710 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
2711 struct batadv_tvlv_tt_data *tt_data,
2714 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2715 struct batadv_hard_iface *primary_if = NULL;
2716 struct batadv_tvlv_tt_change *tt_change;
2717 struct batadv_orig_node *orig_node;
2718 u8 my_ttvn, req_ttvn;
2723 batadv_dbg(BATADV_DBG_TT, bat_priv,
2724 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2725 req_src, tt_data->ttvn,
2726 ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2728 spin_lock_bh(&bat_priv->tt.commit_lock);
2730 my_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
2731 req_ttvn = tt_data->ttvn;
2733 orig_node = batadv_orig_hash_find(bat_priv, req_src);
2737 primary_if = batadv_primary_if_get_selected(bat_priv);
2741 /* If the full table has been explicitly requested or the gap
2742 * is too big send the whole local translation table
2744 if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
2745 !bat_priv->tt.last_changeset)
2750 /* TT fragmentation hasn't been implemented yet, so send as many
2751 * TT entries fit a single packet as possible only
2754 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
2756 tt_len = bat_priv->tt.last_changeset_len;
2757 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2764 /* Copy the last orig_node's OGM buffer */
2765 memcpy(tt_change, bat_priv->tt.last_changeset,
2766 bat_priv->tt.last_changeset_len);
2767 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2769 req_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
2771 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2772 * in the initial part
2775 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2782 /* fill the rest of the tvlv with the real TT entries */
2783 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
2785 batadv_tt_local_valid, NULL);
2788 tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2789 tvlv_tt_data->ttvn = req_ttvn;
2792 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2794 batadv_dbg(BATADV_DBG_TT, bat_priv,
2795 "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2796 orig_node->orig, full_table ? 'F' : '.', req_ttvn);
2798 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2800 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2801 req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2807 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2809 spin_unlock_bh(&bat_priv->tt.commit_lock);
2811 batadv_orig_node_free_ref(orig_node);
2813 batadv_hardif_free_ref(primary_if);
2814 kfree(tvlv_tt_data);
2815 /* The packet was for this host, so it doesn't need to be re-routed */
2820 * batadv_send_tt_response - send reply to tt request
2821 * @bat_priv: the bat priv with all the soft interface information
2822 * @tt_data: tt data containing the tt request information
2823 * @req_src: mac address of tt request sender
2824 * @req_dst: mac address of tt request recipient
2826 * Returns true if tt request reply was sent, false otherwise.
2828 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
2829 struct batadv_tvlv_tt_data *tt_data,
2830 u8 *req_src, u8 *req_dst)
2832 if (batadv_is_my_mac(bat_priv, req_dst))
2833 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
2834 return batadv_send_other_tt_response(bat_priv, tt_data, req_src,
2838 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
2839 struct batadv_orig_node *orig_node,
2840 struct batadv_tvlv_tt_change *tt_change,
2841 u16 tt_num_changes, u8 ttvn)
2846 for (i = 0; i < tt_num_changes; i++) {
2847 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
2848 roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
2849 batadv_tt_global_del(bat_priv, orig_node,
2850 (tt_change + i)->addr,
2851 ntohs((tt_change + i)->vid),
2852 "tt removed by changes",
2855 if (!batadv_tt_global_add(bat_priv, orig_node,
2856 (tt_change + i)->addr,
2857 ntohs((tt_change + i)->vid),
2858 (tt_change + i)->flags, ttvn))
2859 /* In case of problem while storing a
2860 * global_entry, we stop the updating
2861 * procedure without committing the
2862 * ttvn change. This will avoid to send
2863 * corrupted data on tt_request
2868 set_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
2871 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
2872 struct batadv_tvlv_tt_change *tt_change,
2873 u8 ttvn, u8 *resp_src,
2876 struct batadv_orig_node *orig_node;
2878 orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2882 /* Purge the old table first.. */
2883 batadv_tt_global_del_orig(bat_priv, orig_node, -1,
2884 "Received full table");
2886 _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
2889 spin_lock_bh(&orig_node->tt_buff_lock);
2890 kfree(orig_node->tt_buff);
2891 orig_node->tt_buff_len = 0;
2892 orig_node->tt_buff = NULL;
2893 spin_unlock_bh(&orig_node->tt_buff_lock);
2895 atomic_set(&orig_node->last_ttvn, ttvn);
2899 batadv_orig_node_free_ref(orig_node);
2902 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
2903 struct batadv_orig_node *orig_node,
2904 u16 tt_num_changes, u8 ttvn,
2905 struct batadv_tvlv_tt_change *tt_change)
2907 _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
2908 tt_num_changes, ttvn);
2910 batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
2911 batadv_tt_len(tt_num_changes));
2912 atomic_set(&orig_node->last_ttvn, ttvn);
2916 * batadv_is_my_client - check if a client is served by the local node
2917 * @bat_priv: the bat priv with all the soft interface information
2918 * @addr: the mac address of the client to check
2919 * @vid: VLAN identifier
2921 * Returns true if the client is served by this node, false otherwise.
2923 bool batadv_is_my_client(struct batadv_priv *bat_priv, const u8 *addr,
2926 struct batadv_tt_local_entry *tt_local_entry;
2929 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
2930 if (!tt_local_entry)
2932 /* Check if the client has been logically deleted (but is kept for
2933 * consistency purpose)
2935 if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
2936 (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
2941 batadv_tt_local_entry_free_ref(tt_local_entry);
2946 * batadv_handle_tt_response - process incoming tt reply
2947 * @bat_priv: the bat priv with all the soft interface information
2948 * @tt_data: tt data containing the tt request information
2949 * @resp_src: mac address of tt reply sender
2950 * @num_entries: number of tt change entries appended to the tt data
2952 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
2953 struct batadv_tvlv_tt_data *tt_data,
2954 u8 *resp_src, u16 num_entries)
2956 struct batadv_tt_req_node *node;
2957 struct hlist_node *safe;
2958 struct batadv_orig_node *orig_node = NULL;
2959 struct batadv_tvlv_tt_change *tt_change;
2960 u8 *tvlv_ptr = (u8 *)tt_data;
2963 batadv_dbg(BATADV_DBG_TT, bat_priv,
2964 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
2965 resp_src, tt_data->ttvn, num_entries,
2966 ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2968 orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2972 spin_lock_bh(&orig_node->tt_lock);
2974 change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
2975 change_offset *= ntohs(tt_data->num_vlan);
2976 change_offset += sizeof(*tt_data);
2977 tvlv_ptr += change_offset;
2979 tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
2980 if (tt_data->flags & BATADV_TT_FULL_TABLE) {
2981 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
2982 resp_src, num_entries);
2984 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
2985 tt_data->ttvn, tt_change);
2988 /* Recalculate the CRC for this orig_node and store it */
2989 batadv_tt_global_update_crc(bat_priv, orig_node);
2991 spin_unlock_bh(&orig_node->tt_lock);
2993 /* Delete the tt_req_node from pending tt_requests list */
2994 spin_lock_bh(&bat_priv->tt.req_list_lock);
2995 hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2996 if (!batadv_compare_eth(node->addr, resp_src))
2998 hlist_del_init(&node->list);
3002 spin_unlock_bh(&bat_priv->tt.req_list_lock);
3005 batadv_orig_node_free_ref(orig_node);
3008 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
3010 struct batadv_tt_roam_node *node, *safe;
3012 spin_lock_bh(&bat_priv->tt.roam_list_lock);
3014 list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3015 list_del(&node->list);
3019 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3022 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
3024 struct batadv_tt_roam_node *node, *safe;
3026 spin_lock_bh(&bat_priv->tt.roam_list_lock);
3027 list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3028 if (!batadv_has_timed_out(node->first_time,
3029 BATADV_ROAMING_MAX_TIME))
3032 list_del(&node->list);
3035 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3038 /* This function checks whether the client already reached the
3039 * maximum number of possible roaming phases. In this case the ROAMING_ADV
3042 * returns true if the ROAMING_ADV can be sent, false otherwise
3044 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, u8 *client)
3046 struct batadv_tt_roam_node *tt_roam_node;
3049 spin_lock_bh(&bat_priv->tt.roam_list_lock);
3050 /* The new tt_req will be issued only if I'm not waiting for a
3051 * reply from the same orig_node yet
3053 list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
3054 if (!batadv_compare_eth(tt_roam_node->addr, client))
3057 if (batadv_has_timed_out(tt_roam_node->first_time,
3058 BATADV_ROAMING_MAX_TIME))
3061 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
3062 /* Sorry, you roamed too many times! */
3069 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
3073 tt_roam_node->first_time = jiffies;
3074 atomic_set(&tt_roam_node->counter,
3075 BATADV_ROAMING_MAX_COUNT - 1);
3076 ether_addr_copy(tt_roam_node->addr, client);
3078 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
3083 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3088 * batadv_send_roam_adv - send a roaming advertisement message
3089 * @bat_priv: the bat priv with all the soft interface information
3090 * @client: mac address of the roaming client
3091 * @vid: VLAN identifier
3092 * @orig_node: message destination
3094 * Send a ROAMING_ADV message to the node which was previously serving this
3095 * client. This is done to inform the node that from now on all traffic destined
3096 * for this particular roamed client has to be forwarded to the sender of the
3099 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
3101 struct batadv_orig_node *orig_node)
3103 struct batadv_hard_iface *primary_if;
3104 struct batadv_tvlv_roam_adv tvlv_roam;
3106 primary_if = batadv_primary_if_get_selected(bat_priv);
3110 /* before going on we have to check whether the client has
3111 * already roamed to us too many times
3113 if (!batadv_tt_check_roam_count(bat_priv, client))
3116 batadv_dbg(BATADV_DBG_TT, bat_priv,
3117 "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
3118 orig_node->orig, client, BATADV_PRINT_VID(vid));
3120 batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
3122 memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
3123 tvlv_roam.vid = htons(vid);
3125 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3126 orig_node->orig, BATADV_TVLV_ROAM, 1,
3127 &tvlv_roam, sizeof(tvlv_roam));
3131 batadv_hardif_free_ref(primary_if);
3134 static void batadv_tt_purge(struct work_struct *work)
3136 struct delayed_work *delayed_work;
3137 struct batadv_priv_tt *priv_tt;
3138 struct batadv_priv *bat_priv;
3140 delayed_work = container_of(work, struct delayed_work, work);
3141 priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
3142 bat_priv = container_of(priv_tt, struct batadv_priv, tt);
3144 batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
3145 batadv_tt_global_purge(bat_priv);
3146 batadv_tt_req_purge(bat_priv);
3147 batadv_tt_roam_purge(bat_priv);
3149 queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3150 msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3153 void batadv_tt_free(struct batadv_priv *bat_priv)
3155 batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
3156 batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
3158 cancel_delayed_work_sync(&bat_priv->tt.work);
3160 batadv_tt_local_table_free(bat_priv);
3161 batadv_tt_global_table_free(bat_priv);
3162 batadv_tt_req_list_free(bat_priv);
3163 batadv_tt_changes_list_free(bat_priv);
3164 batadv_tt_roam_list_free(bat_priv);
3166 kfree(bat_priv->tt.last_changeset);
3170 * batadv_tt_local_set_flags - set or unset the specified flags on the local
3171 * table and possibly count them in the TT size
3172 * @bat_priv: the bat priv with all the soft interface information
3173 * @flags: the flag to switch
3174 * @enable: whether to set or unset the flag
3175 * @count: whether to increase the TT size by the number of changed entries
3177 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv, u16 flags,
3178 bool enable, bool count)
3180 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3181 struct batadv_tt_common_entry *tt_common_entry;
3182 u16 changed_num = 0;
3183 struct hlist_head *head;
3189 for (i = 0; i < hash->size; i++) {
3190 head = &hash->table[i];
3193 hlist_for_each_entry_rcu(tt_common_entry,
3196 if ((tt_common_entry->flags & flags) == flags)
3198 tt_common_entry->flags |= flags;
3200 if (!(tt_common_entry->flags & flags))
3202 tt_common_entry->flags &= ~flags;
3209 batadv_tt_local_size_inc(bat_priv,
3210 tt_common_entry->vid);
3216 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3217 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3219 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3220 struct batadv_tt_common_entry *tt_common;
3221 struct batadv_tt_local_entry *tt_local;
3222 struct batadv_softif_vlan *vlan;
3223 struct hlist_node *node_tmp;
3224 struct hlist_head *head;
3225 spinlock_t *list_lock; /* protects write access to the hash lists */
3231 for (i = 0; i < hash->size; i++) {
3232 head = &hash->table[i];
3233 list_lock = &hash->list_locks[i];
3235 spin_lock_bh(list_lock);
3236 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3238 if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3241 batadv_dbg(BATADV_DBG_TT, bat_priv,
3242 "Deleting local tt entry (%pM, vid: %d): pending\n",
3244 BATADV_PRINT_VID(tt_common->vid));
3246 batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3247 hlist_del_rcu(&tt_common->hash_entry);
3248 tt_local = container_of(tt_common,
3249 struct batadv_tt_local_entry,
3252 /* decrease the reference held for this vlan */
3253 vlan = batadv_softif_vlan_get(bat_priv, tt_common->vid);
3255 batadv_softif_vlan_free_ref(vlan);
3256 batadv_softif_vlan_free_ref(vlan);
3259 batadv_tt_local_entry_free_ref(tt_local);
3261 spin_unlock_bh(list_lock);
3266 * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3267 * which have been queued in the time since the last commit
3268 * @bat_priv: the bat priv with all the soft interface information
3270 * Caller must hold tt->commit_lock.
3272 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3274 lockdep_assert_held(&bat_priv->tt.commit_lock);
3276 /* Update multicast addresses in local translation table */
3277 batadv_mcast_mla_update(bat_priv);
3279 if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3280 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3281 batadv_tt_tvlv_container_update(bat_priv);
3285 batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3287 batadv_tt_local_purge_pending_clients(bat_priv);
3288 batadv_tt_local_update_crc(bat_priv);
3290 /* Increment the TTVN only once per OGM interval */
3291 atomic_inc(&bat_priv->tt.vn);
3292 batadv_dbg(BATADV_DBG_TT, bat_priv,
3293 "Local changes committed, updating to ttvn %u\n",
3294 (u8)atomic_read(&bat_priv->tt.vn));
3296 /* reset the sending counter */
3297 atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3298 batadv_tt_tvlv_container_update(bat_priv);
3302 * batadv_tt_local_commit_changes - commit all pending local tt changes which
3303 * have been queued in the time since the last commit
3304 * @bat_priv: the bat priv with all the soft interface information
3306 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3308 spin_lock_bh(&bat_priv->tt.commit_lock);
3309 batadv_tt_local_commit_changes_nolock(bat_priv);
3310 spin_unlock_bh(&bat_priv->tt.commit_lock);
3313 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, u8 *src, u8 *dst,
3316 struct batadv_tt_local_entry *tt_local_entry = NULL;
3317 struct batadv_tt_global_entry *tt_global_entry = NULL;
3318 struct batadv_softif_vlan *vlan;
3321 vlan = batadv_softif_vlan_get(bat_priv, vid);
3322 if (!vlan || !atomic_read(&vlan->ap_isolation))
3325 tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3326 if (!tt_local_entry)
3329 tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
3330 if (!tt_global_entry)
3333 if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3340 batadv_softif_vlan_free_ref(vlan);
3341 if (tt_global_entry)
3342 batadv_tt_global_entry_free_ref(tt_global_entry);
3344 batadv_tt_local_entry_free_ref(tt_local_entry);
3349 * batadv_tt_update_orig - update global translation table with new tt
3350 * information received via ogms
3351 * @bat_priv: the bat priv with all the soft interface information
3352 * @orig: the orig_node of the ogm
3353 * @tt_vlan: pointer to the first tvlv VLAN entry
3354 * @tt_num_vlan: number of tvlv VLAN entries
3355 * @tt_change: pointer to the first entry in the TT buffer
3356 * @tt_num_changes: number of tt changes inside the tt buffer
3357 * @ttvn: translation table version number of this changeset
3358 * @tt_crc: crc32 checksum of orig node's translation table
3360 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
3361 struct batadv_orig_node *orig_node,
3362 const void *tt_buff, u16 tt_num_vlan,
3363 struct batadv_tvlv_tt_change *tt_change,
3364 u16 tt_num_changes, u8 ttvn)
3366 u8 orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn);
3367 struct batadv_tvlv_tt_vlan_data *tt_vlan;
3368 bool full_table = true;
3371 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
3372 has_tt_init = test_bit(BATADV_ORIG_CAPA_HAS_TT,
3373 &orig_node->capa_initialized);
3375 /* orig table not initialised AND first diff is in the OGM OR the ttvn
3376 * increased by one -> we can apply the attached changes
3378 if ((!has_tt_init && ttvn == 1) || ttvn - orig_ttvn == 1) {
3379 /* the OGM could not contain the changes due to their size or
3380 * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3382 * In this case send a tt request
3384 if (!tt_num_changes) {
3389 spin_lock_bh(&orig_node->tt_lock);
3391 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
3394 /* Even if we received the precomputed crc with the OGM, we
3395 * prefer to recompute it to spot any possible inconsistency
3396 * in the global table
3398 batadv_tt_global_update_crc(bat_priv, orig_node);
3400 spin_unlock_bh(&orig_node->tt_lock);
3402 /* The ttvn alone is not enough to guarantee consistency
3403 * because a single value could represent different states
3404 * (due to the wrap around). Thus a node has to check whether
3405 * the resulting table (after applying the changes) is still
3406 * consistent or not. E.g. a node could disconnect while its
3407 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3408 * checking the CRC value is mandatory to detect the
3411 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
3415 /* if we missed more than one change or our tables are not
3416 * in sync anymore -> request fresh tt data
3418 if (!has_tt_init || ttvn != orig_ttvn ||
3419 !batadv_tt_global_check_crc(orig_node, tt_vlan,
3422 batadv_dbg(BATADV_DBG_TT, bat_priv,
3423 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3424 orig_node->orig, ttvn, orig_ttvn,
3426 batadv_send_tt_request(bat_priv, orig_node, ttvn,
3427 tt_vlan, tt_num_vlan,
3435 * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3436 * @bat_priv: the bat priv with all the soft interface information
3437 * @addr: the mac address of the client to check
3438 * @vid: VLAN identifier
3440 * Returns true if we know that the client has moved from its old originator
3441 * to another one. This entry is still kept for consistency purposes and will be
3442 * deleted later by a DEL or because of timeout
3444 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
3445 u8 *addr, unsigned short vid)
3447 struct batadv_tt_global_entry *tt_global_entry;
3450 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
3451 if (!tt_global_entry)
3454 ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3455 batadv_tt_global_entry_free_ref(tt_global_entry);
3461 * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3462 * @bat_priv: the bat priv with all the soft interface information
3463 * @addr: the mac address of the local client to query
3464 * @vid: VLAN identifier
3466 * Returns true if the local client is known to be roaming (it is not served by
3467 * this node anymore) or not. If yes, the client is still present in the table
3468 * to keep the latter consistent with the node TTVN
3470 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
3471 u8 *addr, unsigned short vid)
3473 struct batadv_tt_local_entry *tt_local_entry;
3476 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3477 if (!tt_local_entry)
3480 ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3481 batadv_tt_local_entry_free_ref(tt_local_entry);
3486 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
3487 struct batadv_orig_node *orig_node,
3488 const unsigned char *addr,
3493 if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
3494 BATADV_TT_CLIENT_TEMP,
3495 atomic_read(&orig_node->last_ttvn)))
3498 batadv_dbg(BATADV_DBG_TT, bat_priv,
3499 "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3500 addr, BATADV_PRINT_VID(vid), orig_node->orig);
3507 * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
3508 * maximum packet size that can be transported through the mesh
3509 * @soft_iface: netdev struct of the mesh interface
3511 * Remove entries older than 'timeout' and half timeout if more entries need
3514 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
3516 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
3517 int packet_size_max = atomic_read(&bat_priv->packet_size_max);
3518 int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
3519 bool reduced = false;
3521 spin_lock_bh(&bat_priv->tt.commit_lock);
3524 table_size = batadv_tt_local_table_transmit_size(bat_priv);
3525 if (packet_size_max >= table_size)
3528 batadv_tt_local_purge(bat_priv, timeout);
3529 batadv_tt_local_purge_pending_clients(bat_priv);
3533 net_ratelimited_function(batadv_info, soft_iface,
3534 "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3538 /* commit these changes immediately, to avoid synchronization problem
3542 batadv_tt_local_commit_changes_nolock(bat_priv);
3544 spin_unlock_bh(&bat_priv->tt.commit_lock);
3548 * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3549 * @bat_priv: the bat priv with all the soft interface information
3550 * @orig: the orig_node of the ogm
3551 * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3552 * @tvlv_value: tvlv buffer containing the gateway data
3553 * @tvlv_value_len: tvlv buffer length
3555 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
3556 struct batadv_orig_node *orig,
3557 u8 flags, void *tvlv_value,
3560 struct batadv_tvlv_tt_vlan_data *tt_vlan;
3561 struct batadv_tvlv_tt_change *tt_change;
3562 struct batadv_tvlv_tt_data *tt_data;
3563 u16 num_entries, num_vlan;
3565 if (tvlv_value_len < sizeof(*tt_data))
3568 tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3569 tvlv_value_len -= sizeof(*tt_data);
3571 num_vlan = ntohs(tt_data->num_vlan);
3573 if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
3576 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3577 tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
3578 tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
3580 num_entries = batadv_tt_entries(tvlv_value_len);
3582 batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
3583 num_entries, tt_data->ttvn);
3587 * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3589 * @bat_priv: the bat priv with all the soft interface information
3590 * @src: mac address of tt tvlv sender
3591 * @dst: mac address of tt tvlv recipient
3592 * @tvlv_value: tvlv buffer containing the tt data
3593 * @tvlv_value_len: tvlv buffer length
3595 * Returns NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3598 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3603 struct batadv_tvlv_tt_data *tt_data;
3604 u16 tt_vlan_len, tt_num_entries;
3608 if (tvlv_value_len < sizeof(*tt_data))
3609 return NET_RX_SUCCESS;
3611 tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3612 tvlv_value_len -= sizeof(*tt_data);
3614 tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
3615 tt_vlan_len *= ntohs(tt_data->num_vlan);
3617 if (tvlv_value_len < tt_vlan_len)
3618 return NET_RX_SUCCESS;
3620 tvlv_value_len -= tt_vlan_len;
3621 tt_num_entries = batadv_tt_entries(tvlv_value_len);
3623 switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
3624 case BATADV_TT_REQUEST:
3625 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
3627 /* If this node cannot provide a TT response the tt_request is
3630 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
3632 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3637 batadv_dbg(BATADV_DBG_TT, bat_priv,
3638 "Routing TT_REQUEST to %pM [%c]\n",
3640 /* tvlv API will re-route the packet */
3644 case BATADV_TT_RESPONSE:
3645 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
3647 if (batadv_is_my_mac(bat_priv, dst)) {
3648 batadv_handle_tt_response(bat_priv, tt_data,
3649 src, tt_num_entries);
3650 return NET_RX_SUCCESS;
3653 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3658 batadv_dbg(BATADV_DBG_TT, bat_priv,
3659 "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
3661 /* tvlv API will re-route the packet */
3665 return NET_RX_SUCCESS;
3669 * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3670 * @bat_priv: the bat priv with all the soft interface information
3671 * @src: mac address of tt tvlv sender
3672 * @dst: mac address of tt tvlv recipient
3673 * @tvlv_value: tvlv buffer containing the tt data
3674 * @tvlv_value_len: tvlv buffer length
3676 * Returns NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3679 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3684 struct batadv_tvlv_roam_adv *roaming_adv;
3685 struct batadv_orig_node *orig_node = NULL;
3687 /* If this node is not the intended recipient of the
3688 * roaming advertisement the packet is forwarded
3689 * (the tvlv API will re-route the packet).
3691 if (!batadv_is_my_mac(bat_priv, dst))
3694 if (tvlv_value_len < sizeof(*roaming_adv))
3697 orig_node = batadv_orig_hash_find(bat_priv, src);
3701 batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
3702 roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
3704 batadv_dbg(BATADV_DBG_TT, bat_priv,
3705 "Received ROAMING_ADV from %pM (client %pM)\n",
3706 src, roaming_adv->client);
3708 batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
3709 ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
3710 atomic_read(&orig_node->last_ttvn) + 1);
3714 batadv_orig_node_free_ref(orig_node);
3715 return NET_RX_SUCCESS;
3719 * batadv_tt_init - initialise the translation table internals
3720 * @bat_priv: the bat priv with all the soft interface information
3722 * Return 0 on success or negative error number in case of failure.
3724 int batadv_tt_init(struct batadv_priv *bat_priv)
3728 /* synchronized flags must be remote */
3729 BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
3731 ret = batadv_tt_local_init(bat_priv);
3735 ret = batadv_tt_global_init(bat_priv);
3739 batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
3740 batadv_tt_tvlv_unicast_handler_v1,
3741 BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
3743 batadv_tvlv_handler_register(bat_priv, NULL,
3744 batadv_roam_tvlv_unicast_handler_v1,
3745 BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
3747 INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
3748 queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3749 msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3755 * batadv_tt_global_is_isolated - check if a client is marked as isolated
3756 * @bat_priv: the bat priv with all the soft interface information
3757 * @addr: the mac address of the client
3758 * @vid: the identifier of the VLAN where this client is connected
3760 * Returns true if the client is marked with the TT_CLIENT_ISOLA flag, false
3763 bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
3764 const u8 *addr, unsigned short vid)
3766 struct batadv_tt_global_entry *tt;
3769 tt = batadv_tt_global_hash_find(bat_priv, addr, vid);
3773 ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA;
3775 batadv_tt_global_entry_free_ref(tt);