1 /* Copyright (C) 2007-2016 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/kref.h>
35 #include <linux/list.h>
36 #include <linux/lockdep.h>
37 #include <linux/netdevice.h>
38 #include <linux/rculist.h>
39 #include <linux/rcupdate.h>
40 #include <linux/seq_file.h>
41 #include <linux/slab.h>
42 #include <linux/spinlock.h>
43 #include <linux/stddef.h>
44 #include <linux/string.h>
45 #include <linux/workqueue.h>
46 #include <net/net_namespace.h>
48 #include "bridge_loop_avoidance.h"
49 #include "hard-interface.h"
51 #include "multicast.h"
52 #include "originator.h"
54 #include "soft-interface.h"
57 static struct lock_class_key batadv_tt_local_hash_lock_class_key;
58 static struct lock_class_key batadv_tt_global_hash_lock_class_key;
60 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
62 struct batadv_orig_node *orig_node);
63 static void batadv_tt_purge(struct work_struct *work);
65 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
66 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
67 struct batadv_orig_node *orig_node,
68 const unsigned char *addr,
69 unsigned short vid, const char *message,
73 * batadv_compare_tt - check if two TT entries are the same
74 * @node: the list element pointer of the first TT entry
75 * @data2: pointer to the tt_common_entry of the second TT entry
77 * Compare the MAC address and the VLAN ID of the two TT entries and check if
78 * they are the same TT client.
79 * Return: 1 if the two TT clients are the same, 0 otherwise
81 static int batadv_compare_tt(const struct hlist_node *node, const void *data2)
83 const void *data1 = container_of(node, struct batadv_tt_common_entry,
85 const struct batadv_tt_common_entry *tt1 = data1;
86 const struct batadv_tt_common_entry *tt2 = data2;
88 return (tt1->vid == tt2->vid) && batadv_compare_eth(data1, data2);
92 * batadv_choose_tt - return the index of the tt entry in the hash table
93 * @data: pointer to the tt_common_entry object to map
94 * @size: the size of the hash table
96 * Return: the hash index where the object represented by 'data' should be
99 static inline u32 batadv_choose_tt(const void *data, u32 size)
101 struct batadv_tt_common_entry *tt;
104 tt = (struct batadv_tt_common_entry *)data;
105 hash = jhash(&tt->addr, ETH_ALEN, hash);
106 hash = jhash(&tt->vid, sizeof(tt->vid), hash);
112 * batadv_tt_hash_find - look for a client in the given hash table
113 * @hash: the hash table to search
114 * @addr: the mac address of the client to look for
115 * @vid: VLAN identifier
117 * Return: a pointer to the tt_common struct belonging to the searched client if
118 * found, NULL otherwise.
120 static struct batadv_tt_common_entry *
121 batadv_tt_hash_find(struct batadv_hashtable *hash, const u8 *addr,
124 struct hlist_head *head;
125 struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL;
131 ether_addr_copy(to_search.addr, addr);
134 index = batadv_choose_tt(&to_search, hash->size);
135 head = &hash->table[index];
138 hlist_for_each_entry_rcu(tt, head, hash_entry) {
139 if (!batadv_compare_eth(tt, addr))
145 if (!kref_get_unless_zero(&tt->refcount))
157 * batadv_tt_local_hash_find - search the local table for a given client
158 * @bat_priv: the bat priv with all the soft interface information
159 * @addr: the mac address of the client to look for
160 * @vid: VLAN identifier
162 * Return: a pointer to the corresponding tt_local_entry struct if the client is
163 * found, NULL otherwise.
165 static struct batadv_tt_local_entry *
166 batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
169 struct batadv_tt_common_entry *tt_common_entry;
170 struct batadv_tt_local_entry *tt_local_entry = NULL;
172 tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, addr,
175 tt_local_entry = container_of(tt_common_entry,
176 struct batadv_tt_local_entry,
178 return tt_local_entry;
182 * batadv_tt_global_hash_find - search the global table for a given client
183 * @bat_priv: the bat priv with all the soft interface information
184 * @addr: the mac address of the client to look for
185 * @vid: VLAN identifier
187 * Return: a pointer to the corresponding tt_global_entry struct if the client
188 * is found, NULL otherwise.
190 static struct batadv_tt_global_entry *
191 batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
194 struct batadv_tt_common_entry *tt_common_entry;
195 struct batadv_tt_global_entry *tt_global_entry = NULL;
197 tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, addr,
200 tt_global_entry = container_of(tt_common_entry,
201 struct batadv_tt_global_entry,
203 return tt_global_entry;
207 * batadv_tt_local_entry_release - release tt_local_entry from lists and queue
208 * for free after rcu grace period
209 * @ref: kref pointer of the nc_node
211 static void batadv_tt_local_entry_release(struct kref *ref)
213 struct batadv_tt_local_entry *tt_local_entry;
215 tt_local_entry = container_of(ref, struct batadv_tt_local_entry,
218 batadv_softif_vlan_put(tt_local_entry->vlan);
220 kfree_rcu(tt_local_entry, common.rcu);
224 * batadv_tt_local_entry_put - decrement the tt_local_entry refcounter and
225 * possibly release it
226 * @tt_local_entry: tt_local_entry to be free'd
229 batadv_tt_local_entry_put(struct batadv_tt_local_entry *tt_local_entry)
231 kref_put(&tt_local_entry->common.refcount,
232 batadv_tt_local_entry_release);
236 * batadv_tt_global_entry_release - release tt_global_entry from lists and queue
237 * for free after rcu grace period
238 * @ref: kref pointer of the nc_node
240 static void batadv_tt_global_entry_release(struct kref *ref)
242 struct batadv_tt_global_entry *tt_global_entry;
244 tt_global_entry = container_of(ref, struct batadv_tt_global_entry,
247 batadv_tt_global_del_orig_list(tt_global_entry);
248 kfree_rcu(tt_global_entry, common.rcu);
252 * batadv_tt_global_entry_put - decrement the tt_global_entry refcounter and
253 * possibly release it
254 * @tt_global_entry: tt_global_entry to be free'd
257 batadv_tt_global_entry_put(struct batadv_tt_global_entry *tt_global_entry)
259 kref_put(&tt_global_entry->common.refcount,
260 batadv_tt_global_entry_release);
264 * batadv_tt_global_hash_count - count the number of orig entries
265 * @bat_priv: the bat priv with all the soft interface information
266 * @addr: the mac address of the client to count entries for
267 * @vid: VLAN identifier
269 * Return: the number of originators advertising the given address/data
270 * (excluding ourself).
272 int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
273 const u8 *addr, unsigned short vid)
275 struct batadv_tt_global_entry *tt_global_entry;
278 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
279 if (!tt_global_entry)
282 count = atomic_read(&tt_global_entry->orig_list_count);
283 batadv_tt_global_entry_put(tt_global_entry);
289 * batadv_tt_local_size_mod - change the size by v of the local table identified
291 * @bat_priv: the bat priv with all the soft interface information
292 * @vid: the VLAN identifier of the sub-table to change
293 * @v: the amount to sum to the local table size
295 static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
296 unsigned short vid, int v)
298 struct batadv_softif_vlan *vlan;
300 vlan = batadv_softif_vlan_get(bat_priv, vid);
304 atomic_add(v, &vlan->tt.num_entries);
306 batadv_softif_vlan_put(vlan);
310 * batadv_tt_local_size_inc - increase by one the local table size for the given
312 * @bat_priv: the bat priv with all the soft interface information
313 * @vid: the VLAN identifier
315 static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv,
318 batadv_tt_local_size_mod(bat_priv, vid, 1);
322 * batadv_tt_local_size_dec - decrease by one the local table size for the given
324 * @bat_priv: the bat priv with all the soft interface information
325 * @vid: the VLAN identifier
327 static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv,
330 batadv_tt_local_size_mod(bat_priv, vid, -1);
334 * batadv_tt_global_size_mod - change the size by v of the global table
335 * for orig_node identified by vid
336 * @orig_node: the originator for which the table has to be modified
337 * @vid: the VLAN identifier
338 * @v: the amount to sum to the global table size
340 static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node,
341 unsigned short vid, int v)
343 struct batadv_orig_node_vlan *vlan;
345 vlan = batadv_orig_node_vlan_new(orig_node, vid);
349 if (atomic_add_return(v, &vlan->tt.num_entries) == 0) {
350 spin_lock_bh(&orig_node->vlan_list_lock);
351 if (!hlist_unhashed(&vlan->list)) {
352 hlist_del_init_rcu(&vlan->list);
353 batadv_orig_node_vlan_put(vlan);
355 spin_unlock_bh(&orig_node->vlan_list_lock);
358 batadv_orig_node_vlan_put(vlan);
362 * batadv_tt_global_size_inc - increase by one the global table size for the
364 * @orig_node: the originator which global table size has to be decreased
365 * @vid: the vlan identifier
367 static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
370 batadv_tt_global_size_mod(orig_node, vid, 1);
374 * batadv_tt_global_size_dec - decrease by one the global table size for the
376 * @orig_node: the originator which global table size has to be decreased
377 * @vid: the vlan identifier
379 static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
382 batadv_tt_global_size_mod(orig_node, vid, -1);
386 * batadv_tt_orig_list_entry_release - release tt orig entry from lists and
387 * queue for free after rcu grace period
388 * @ref: kref pointer of the tt orig entry
390 static void batadv_tt_orig_list_entry_release(struct kref *ref)
392 struct batadv_tt_orig_list_entry *orig_entry;
394 orig_entry = container_of(ref, struct batadv_tt_orig_list_entry,
397 batadv_orig_node_put(orig_entry->orig_node);
398 kfree_rcu(orig_entry, rcu);
402 * batadv_tt_orig_list_entry_put - decrement the tt orig entry refcounter and
403 * possibly release it
404 * @orig_entry: tt orig entry to be free'd
407 batadv_tt_orig_list_entry_put(struct batadv_tt_orig_list_entry *orig_entry)
409 kref_put(&orig_entry->refcount, batadv_tt_orig_list_entry_release);
413 * batadv_tt_local_event - store a local TT event (ADD/DEL)
414 * @bat_priv: the bat priv with all the soft interface information
415 * @tt_local_entry: the TT entry involved in the event
416 * @event_flags: flags to store in the event structure
418 static void batadv_tt_local_event(struct batadv_priv *bat_priv,
419 struct batadv_tt_local_entry *tt_local_entry,
422 struct batadv_tt_change_node *tt_change_node, *entry, *safe;
423 struct batadv_tt_common_entry *common = &tt_local_entry->common;
424 u8 flags = common->flags | event_flags;
425 bool event_removed = false;
426 bool del_op_requested, del_op_entry;
428 tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
432 tt_change_node->change.flags = flags;
433 memset(tt_change_node->change.reserved, 0,
434 sizeof(tt_change_node->change.reserved));
435 ether_addr_copy(tt_change_node->change.addr, common->addr);
436 tt_change_node->change.vid = htons(common->vid);
438 del_op_requested = flags & BATADV_TT_CLIENT_DEL;
440 /* check for ADD+DEL or DEL+ADD events */
441 spin_lock_bh(&bat_priv->tt.changes_list_lock);
442 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
444 if (!batadv_compare_eth(entry->change.addr, common->addr))
447 /* DEL+ADD in the same orig interval have no effect and can be
448 * removed to avoid silly behaviour on the receiver side. The
449 * other way around (ADD+DEL) can happen in case of roaming of
450 * a client still in the NEW state. Roaming of NEW clients is
451 * now possible due to automatically recognition of "temporary"
454 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
455 if (!del_op_requested && del_op_entry)
457 if (del_op_requested && !del_op_entry)
460 /* this is a second add in the same originator interval. It
461 * means that flags have been changed: update them!
463 if (!del_op_requested && !del_op_entry)
464 entry->change.flags = flags;
468 list_del(&entry->list);
470 kfree(tt_change_node);
471 event_removed = true;
475 /* track the change in the OGMinterval list */
476 list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
479 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
482 atomic_dec(&bat_priv->tt.local_changes);
484 atomic_inc(&bat_priv->tt.local_changes);
488 * batadv_tt_len - compute length in bytes of given number of tt changes
489 * @changes_num: number of tt changes
491 * Return: computed length in bytes.
493 static int batadv_tt_len(int changes_num)
495 return changes_num * sizeof(struct batadv_tvlv_tt_change);
499 * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
500 * @tt_len: available space
502 * Return: the number of entries.
504 static u16 batadv_tt_entries(u16 tt_len)
506 return tt_len / batadv_tt_len(1);
510 * batadv_tt_local_table_transmit_size - calculates the local translation table
511 * size when transmitted over the air
512 * @bat_priv: the bat priv with all the soft interface information
514 * Return: local translation table size in bytes.
516 static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
519 u16 tt_local_entries = 0;
520 struct batadv_softif_vlan *vlan;
524 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
526 tt_local_entries += atomic_read(&vlan->tt.num_entries);
530 /* header size of tvlv encapsulated tt response payload */
531 hdr_size = sizeof(struct batadv_unicast_tvlv_packet);
532 hdr_size += sizeof(struct batadv_tvlv_hdr);
533 hdr_size += sizeof(struct batadv_tvlv_tt_data);
534 hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data);
536 return hdr_size + batadv_tt_len(tt_local_entries);
539 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
541 if (bat_priv->tt.local_hash)
544 bat_priv->tt.local_hash = batadv_hash_new(1024);
546 if (!bat_priv->tt.local_hash)
549 batadv_hash_set_lock_class(bat_priv->tt.local_hash,
550 &batadv_tt_local_hash_lock_class_key);
555 static void batadv_tt_global_free(struct batadv_priv *bat_priv,
556 struct batadv_tt_global_entry *tt_global,
559 batadv_dbg(BATADV_DBG_TT, bat_priv,
560 "Deleting global tt entry %pM (vid: %d): %s\n",
561 tt_global->common.addr,
562 BATADV_PRINT_VID(tt_global->common.vid), message);
564 batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
565 batadv_choose_tt, &tt_global->common);
566 batadv_tt_global_entry_put(tt_global);
570 * batadv_tt_local_add - add a new client to the local table or update an
572 * @soft_iface: netdev struct of the mesh interface
573 * @addr: the mac address of the client to add
574 * @vid: VLAN identifier
575 * @ifindex: index of the interface where the client is connected to (useful to
576 * identify wireless clients)
577 * @mark: the value contained in the skb->mark field of the received packet (if
580 * Return: true if the client was successfully added, false otherwise.
582 bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
583 unsigned short vid, int ifindex, u32 mark)
585 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
586 struct batadv_tt_local_entry *tt_local;
587 struct batadv_tt_global_entry *tt_global = NULL;
588 struct batadv_softif_vlan *vlan;
589 struct net_device *in_dev = NULL;
590 struct hlist_head *head;
591 struct batadv_tt_orig_list_entry *orig_entry;
592 int hash_added, table_size, packet_size_max;
594 bool roamed_back = false;
598 if (ifindex != BATADV_NULL_IFINDEX)
599 in_dev = dev_get_by_index(&init_net, ifindex);
601 tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
603 if (!is_multicast_ether_addr(addr))
604 tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
607 tt_local->last_seen = jiffies;
608 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
609 batadv_dbg(BATADV_DBG_TT, bat_priv,
610 "Re-adding pending client %pM (vid: %d)\n",
611 addr, BATADV_PRINT_VID(vid));
612 /* whatever the reason why the PENDING flag was set,
613 * this is a client which was enqueued to be removed in
614 * this orig_interval. Since it popped up again, the
615 * flag can be reset like it was never enqueued
617 tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
621 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
622 batadv_dbg(BATADV_DBG_TT, bat_priv,
623 "Roaming client %pM (vid: %d) came back to its original location\n",
624 addr, BATADV_PRINT_VID(vid));
625 /* the ROAM flag is set because this client roamed away
626 * and the node got a roaming_advertisement message. Now
627 * that the client popped up again at its original
628 * location such flag can be unset
630 tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
636 /* Ignore the client if we cannot send it in a full table response. */
637 table_size = batadv_tt_local_table_transmit_size(bat_priv);
638 table_size += batadv_tt_len(1);
639 packet_size_max = atomic_read(&bat_priv->packet_size_max);
640 if (table_size > packet_size_max) {
641 net_ratelimited_function(batadv_info, soft_iface,
642 "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
643 table_size, packet_size_max, addr);
647 tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC);
651 /* increase the refcounter of the related vlan */
652 vlan = batadv_softif_vlan_get(bat_priv, vid);
653 if (WARN(!vlan, "adding TT local entry %pM to non-existent VLAN %d",
654 addr, BATADV_PRINT_VID(vid))) {
660 batadv_dbg(BATADV_DBG_TT, bat_priv,
661 "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
662 addr, BATADV_PRINT_VID(vid),
663 (u8)atomic_read(&bat_priv->tt.vn));
665 ether_addr_copy(tt_local->common.addr, addr);
666 /* The local entry has to be marked as NEW to avoid to send it in
667 * a full table response going out before the next ttvn increment
668 * (consistency check)
670 tt_local->common.flags = BATADV_TT_CLIENT_NEW;
671 tt_local->common.vid = vid;
672 if (batadv_is_wifi_netdev(in_dev))
673 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
674 kref_init(&tt_local->common.refcount);
675 kref_get(&tt_local->common.refcount);
676 tt_local->last_seen = jiffies;
677 tt_local->common.added_at = tt_local->last_seen;
678 tt_local->vlan = vlan;
680 /* the batman interface mac and multicast addresses should never be
683 if (batadv_compare_eth(addr, soft_iface->dev_addr) ||
684 is_multicast_ether_addr(addr))
685 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
687 hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
688 batadv_choose_tt, &tt_local->common,
689 &tt_local->common.hash_entry);
691 if (unlikely(hash_added != 0)) {
692 /* remove the reference for the hash */
693 batadv_tt_local_entry_put(tt_local);
694 batadv_softif_vlan_put(vlan);
699 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
702 /* Check whether it is a roaming, but don't do anything if the roaming
703 * process has already been handled
705 if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
706 /* These node are probably going to update their tt table */
707 head = &tt_global->orig_list;
709 hlist_for_each_entry_rcu(orig_entry, head, list) {
710 batadv_send_roam_adv(bat_priv, tt_global->common.addr,
711 tt_global->common.vid,
712 orig_entry->orig_node);
716 batadv_tt_global_free(bat_priv, tt_global,
720 /* The global entry has to be marked as ROAMING and
721 * has to be kept for consistency purpose
723 tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
724 tt_global->roam_at = jiffies;
728 /* store the current remote flags before altering them. This helps
729 * understanding is flags are changing or not
731 remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK;
733 if (batadv_is_wifi_netdev(in_dev))
734 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
736 tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI;
738 /* check the mark in the skb: if it's equal to the configured
739 * isolation_mark, it means the packet is coming from an isolated
742 match_mark = (mark & bat_priv->isolation_mark_mask);
743 if (bat_priv->isolation_mark_mask &&
744 match_mark == bat_priv->isolation_mark)
745 tt_local->common.flags |= BATADV_TT_CLIENT_ISOLA;
747 tt_local->common.flags &= ~BATADV_TT_CLIENT_ISOLA;
749 /* if any "dynamic" flag has been modified, resend an ADD event for this
750 * entry so that all the nodes can get the new flags
752 if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
753 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
760 batadv_tt_local_entry_put(tt_local);
762 batadv_tt_global_entry_put(tt_global);
767 * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
768 * within a TT Response directed to another node
769 * @orig_node: originator for which the TT data has to be prepared
770 * @tt_data: uninitialised pointer to the address of the TVLV buffer
771 * @tt_change: uninitialised pointer to the address of the area where the TT
772 * changed can be stored
773 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
774 * function reserves the amount of space needed to send the entire global TT
775 * table. In case of success the value is updated with the real amount of
777 * Allocate the needed amount of memory for the entire TT TVLV and write its
778 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
779 * objects, one per active VLAN served by the originator node.
781 * Return: the size of the allocated buffer or 0 in case of failure.
784 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
785 struct batadv_tvlv_tt_data **tt_data,
786 struct batadv_tvlv_tt_change **tt_change,
793 struct batadv_tvlv_tt_vlan_data *tt_vlan;
794 struct batadv_orig_node_vlan *vlan;
798 hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
800 num_entries += atomic_read(&vlan->tt.num_entries);
803 change_offset = sizeof(**tt_data);
804 change_offset += num_vlan * sizeof(*tt_vlan);
806 /* if tt_len is negative, allocate the space needed by the full table */
808 *tt_len = batadv_tt_len(num_entries);
811 tvlv_len += change_offset;
813 *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
819 (*tt_data)->flags = BATADV_NO_FLAGS;
820 (*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
821 (*tt_data)->num_vlan = htons(num_vlan);
823 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
824 hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
825 tt_vlan->vid = htons(vlan->vid);
826 tt_vlan->crc = htonl(vlan->tt.crc);
831 tt_change_ptr = (u8 *)*tt_data + change_offset;
832 *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
840 * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
842 * @bat_priv: the bat priv with all the soft interface information
843 * @tt_data: uninitialised pointer to the address of the TVLV buffer
844 * @tt_change: uninitialised pointer to the address of the area where the TT
845 * changes can be stored
846 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
847 * function reserves the amount of space needed to send the entire local TT
848 * table. In case of success the value is updated with the real amount of
851 * Allocate the needed amount of memory for the entire TT TVLV and write its
852 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
853 * objects, one per active VLAN.
855 * Return: the size of the allocated buffer or 0 in case of failure.
858 batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
859 struct batadv_tvlv_tt_data **tt_data,
860 struct batadv_tvlv_tt_change **tt_change,
863 struct batadv_tvlv_tt_vlan_data *tt_vlan;
864 struct batadv_softif_vlan *vlan;
872 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
874 num_entries += atomic_read(&vlan->tt.num_entries);
877 change_offset = sizeof(**tt_data);
878 change_offset += num_vlan * sizeof(*tt_vlan);
880 /* if tt_len is negative, allocate the space needed by the full table */
882 *tt_len = batadv_tt_len(num_entries);
885 tvlv_len += change_offset;
887 *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
893 (*tt_data)->flags = BATADV_NO_FLAGS;
894 (*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
895 (*tt_data)->num_vlan = htons(num_vlan);
897 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
898 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
899 tt_vlan->vid = htons(vlan->vid);
900 tt_vlan->crc = htonl(vlan->tt.crc);
905 tt_change_ptr = (u8 *)*tt_data + change_offset;
906 *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
914 * batadv_tt_tvlv_container_update - update the translation table tvlv container
915 * after local tt changes have been committed
916 * @bat_priv: the bat priv with all the soft interface information
918 static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
920 struct batadv_tt_change_node *entry, *safe;
921 struct batadv_tvlv_tt_data *tt_data;
922 struct batadv_tvlv_tt_change *tt_change;
923 int tt_diff_len, tt_change_len = 0;
924 int tt_diff_entries_num = 0;
925 int tt_diff_entries_count = 0;
928 tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
929 tt_diff_len = batadv_tt_len(tt_diff_entries_num);
931 /* if we have too many changes for one packet don't send any
932 * and wait for the tt table request which will be fragmented
934 if (tt_diff_len > bat_priv->soft_iface->mtu)
937 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
938 &tt_change, &tt_diff_len);
942 tt_data->flags = BATADV_TT_OGM_DIFF;
944 if (tt_diff_len == 0)
945 goto container_register;
947 spin_lock_bh(&bat_priv->tt.changes_list_lock);
948 atomic_set(&bat_priv->tt.local_changes, 0);
950 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
952 if (tt_diff_entries_count < tt_diff_entries_num) {
953 memcpy(tt_change + tt_diff_entries_count,
955 sizeof(struct batadv_tvlv_tt_change));
956 tt_diff_entries_count++;
958 list_del(&entry->list);
961 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
963 /* Keep the buffer for possible tt_request */
964 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
965 kfree(bat_priv->tt.last_changeset);
966 bat_priv->tt.last_changeset_len = 0;
967 bat_priv->tt.last_changeset = NULL;
968 tt_change_len = batadv_tt_len(tt_diff_entries_count);
969 /* check whether this new OGM has no changes due to size problems */
970 if (tt_diff_entries_count > 0) {
971 /* if kmalloc() fails we will reply with the full table
972 * instead of providing the diff
974 bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
975 if (bat_priv->tt.last_changeset) {
976 memcpy(bat_priv->tt.last_changeset,
977 tt_change, tt_change_len);
978 bat_priv->tt.last_changeset_len = tt_diff_len;
981 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
984 batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
989 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
991 struct net_device *net_dev = (struct net_device *)seq->private;
992 struct batadv_priv *bat_priv = netdev_priv(net_dev);
993 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
994 struct batadv_tt_common_entry *tt_common_entry;
995 struct batadv_tt_local_entry *tt_local;
996 struct batadv_hard_iface *primary_if;
997 struct hlist_head *head;
1001 int last_seen_msecs;
1002 unsigned long last_seen_jiffies;
1004 u16 np_flag = BATADV_TT_CLIENT_NOPURGE;
1006 primary_if = batadv_seq_print_text_primary_if_get(seq);
1011 "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
1012 net_dev->name, (u8)atomic_read(&bat_priv->tt.vn));
1013 seq_printf(seq, " %-13s %s %-8s %-9s (%-10s)\n", "Client", "VID",
1014 "Flags", "Last seen", "CRC");
1016 for (i = 0; i < hash->size; i++) {
1017 head = &hash->table[i];
1020 hlist_for_each_entry_rcu(tt_common_entry,
1022 tt_local = container_of(tt_common_entry,
1023 struct batadv_tt_local_entry,
1025 vid = tt_common_entry->vid;
1026 last_seen_jiffies = jiffies - tt_local->last_seen;
1027 last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
1028 last_seen_secs = last_seen_msecs / 1000;
1029 last_seen_msecs = last_seen_msecs % 1000;
1031 no_purge = tt_common_entry->flags & np_flag;
1033 " * %pM %4i [%c%c%c%c%c%c] %3u.%03u (%#.8x)\n",
1034 tt_common_entry->addr,
1035 BATADV_PRINT_VID(tt_common_entry->vid),
1036 ((tt_common_entry->flags &
1037 BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1038 no_purge ? 'P' : '.',
1039 ((tt_common_entry->flags &
1040 BATADV_TT_CLIENT_NEW) ? 'N' : '.'),
1041 ((tt_common_entry->flags &
1042 BATADV_TT_CLIENT_PENDING) ? 'X' : '.'),
1043 ((tt_common_entry->flags &
1044 BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1045 ((tt_common_entry->flags &
1046 BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1047 no_purge ? 0 : last_seen_secs,
1048 no_purge ? 0 : last_seen_msecs,
1049 tt_local->vlan->tt.crc);
1055 batadv_hardif_put(primary_if);
1060 batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
1061 struct batadv_tt_local_entry *tt_local_entry,
1062 u16 flags, const char *message)
1064 batadv_tt_local_event(bat_priv, tt_local_entry, flags);
1066 /* The local client has to be marked as "pending to be removed" but has
1067 * to be kept in the table in order to send it in a full table
1068 * response issued before the net ttvn increment (consistency check)
1070 tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
1072 batadv_dbg(BATADV_DBG_TT, bat_priv,
1073 "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
1074 tt_local_entry->common.addr,
1075 BATADV_PRINT_VID(tt_local_entry->common.vid), message);
1079 * batadv_tt_local_remove - logically remove an entry from the local table
1080 * @bat_priv: the bat priv with all the soft interface information
1081 * @addr: the MAC address of the client to remove
1082 * @vid: VLAN identifier
1083 * @message: message to append to the log on deletion
1084 * @roaming: true if the deletion is due to a roaming event
1086 * Return: the flags assigned to the local entry before being deleted
1088 u16 batadv_tt_local_remove(struct batadv_priv *bat_priv, const u8 *addr,
1089 unsigned short vid, const char *message,
1092 struct batadv_tt_local_entry *tt_local_entry;
1093 u16 flags, curr_flags = BATADV_NO_FLAGS;
1094 void *tt_entry_exists;
1096 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
1097 if (!tt_local_entry)
1100 curr_flags = tt_local_entry->common.flags;
1102 flags = BATADV_TT_CLIENT_DEL;
1103 /* if this global entry addition is due to a roaming, the node has to
1104 * mark the local entry as "roamed" in order to correctly reroute
1108 flags |= BATADV_TT_CLIENT_ROAM;
1109 /* mark the local client as ROAMed */
1110 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1113 if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
1114 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
1118 /* if this client has been added right now, it is possible to
1119 * immediately purge it
1121 batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL);
1123 tt_entry_exists = batadv_hash_remove(bat_priv->tt.local_hash,
1126 &tt_local_entry->common);
1127 if (!tt_entry_exists)
1130 /* extra call to free the local tt entry */
1131 batadv_tt_local_entry_put(tt_local_entry);
1135 batadv_tt_local_entry_put(tt_local_entry);
1141 * batadv_tt_local_purge_list - purge inactive tt local entries
1142 * @bat_priv: the bat priv with all the soft interface information
1143 * @head: pointer to the list containing the local tt entries
1144 * @timeout: parameter deciding whether a given tt local entry is considered
1147 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
1148 struct hlist_head *head,
1151 struct batadv_tt_local_entry *tt_local_entry;
1152 struct batadv_tt_common_entry *tt_common_entry;
1153 struct hlist_node *node_tmp;
1155 hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
1157 tt_local_entry = container_of(tt_common_entry,
1158 struct batadv_tt_local_entry,
1160 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
1163 /* entry already marked for deletion */
1164 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
1167 if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout))
1170 batadv_tt_local_set_pending(bat_priv, tt_local_entry,
1171 BATADV_TT_CLIENT_DEL, "timed out");
1176 * batadv_tt_local_purge - purge inactive tt local entries
1177 * @bat_priv: the bat priv with all the soft interface information
1178 * @timeout: parameter deciding whether a given tt local entry is considered
1181 static void batadv_tt_local_purge(struct batadv_priv *bat_priv,
1184 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1185 struct hlist_head *head;
1186 spinlock_t *list_lock; /* protects write access to the hash lists */
1189 for (i = 0; i < hash->size; i++) {
1190 head = &hash->table[i];
1191 list_lock = &hash->list_locks[i];
1193 spin_lock_bh(list_lock);
1194 batadv_tt_local_purge_list(bat_priv, head, timeout);
1195 spin_unlock_bh(list_lock);
1199 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
1201 struct batadv_hashtable *hash;
1202 spinlock_t *list_lock; /* protects write access to the hash lists */
1203 struct batadv_tt_common_entry *tt_common_entry;
1204 struct batadv_tt_local_entry *tt_local;
1205 struct hlist_node *node_tmp;
1206 struct hlist_head *head;
1209 if (!bat_priv->tt.local_hash)
1212 hash = bat_priv->tt.local_hash;
1214 for (i = 0; i < hash->size; i++) {
1215 head = &hash->table[i];
1216 list_lock = &hash->list_locks[i];
1218 spin_lock_bh(list_lock);
1219 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1221 hlist_del_rcu(&tt_common_entry->hash_entry);
1222 tt_local = container_of(tt_common_entry,
1223 struct batadv_tt_local_entry,
1226 batadv_tt_local_entry_put(tt_local);
1228 spin_unlock_bh(list_lock);
1231 batadv_hash_destroy(hash);
1233 bat_priv->tt.local_hash = NULL;
1236 static int batadv_tt_global_init(struct batadv_priv *bat_priv)
1238 if (bat_priv->tt.global_hash)
1241 bat_priv->tt.global_hash = batadv_hash_new(1024);
1243 if (!bat_priv->tt.global_hash)
1246 batadv_hash_set_lock_class(bat_priv->tt.global_hash,
1247 &batadv_tt_global_hash_lock_class_key);
1252 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
1254 struct batadv_tt_change_node *entry, *safe;
1256 spin_lock_bh(&bat_priv->tt.changes_list_lock);
1258 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1260 list_del(&entry->list);
1264 atomic_set(&bat_priv->tt.local_changes, 0);
1265 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1269 * batadv_tt_global_orig_entry_find - find a TT orig_list_entry
1270 * @entry: the TT global entry where the orig_list_entry has to be
1272 * @orig_node: the originator for which the orig_list_entry has to be found
1274 * retrieve the orig_tt_list_entry belonging to orig_node from the
1275 * batadv_tt_global_entry list
1277 * Return: it with an increased refcounter, NULL if not found
1279 static struct batadv_tt_orig_list_entry *
1280 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
1281 const struct batadv_orig_node *orig_node)
1283 struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
1284 const struct hlist_head *head;
1287 head = &entry->orig_list;
1288 hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
1289 if (tmp_orig_entry->orig_node != orig_node)
1291 if (!kref_get_unless_zero(&tmp_orig_entry->refcount))
1294 orig_entry = tmp_orig_entry;
1303 * batadv_tt_global_entry_has_orig - check if a TT global entry is also handled
1304 * by a given originator
1305 * @entry: the TT global entry to check
1306 * @orig_node: the originator to search in the list
1308 * find out if an orig_node is already in the list of a tt_global_entry.
1310 * Return: true if found, false otherwise
1313 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
1314 const struct batadv_orig_node *orig_node)
1316 struct batadv_tt_orig_list_entry *orig_entry;
1319 orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
1322 batadv_tt_orig_list_entry_put(orig_entry);
1329 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
1330 struct batadv_orig_node *orig_node, int ttvn)
1332 struct batadv_tt_orig_list_entry *orig_entry;
1334 orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
1336 /* refresh the ttvn: the current value could be a bogus one that
1337 * was added during a "temporary client detection"
1339 orig_entry->ttvn = ttvn;
1343 orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
1347 INIT_HLIST_NODE(&orig_entry->list);
1348 kref_get(&orig_node->refcount);
1349 batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
1350 orig_entry->orig_node = orig_node;
1351 orig_entry->ttvn = ttvn;
1352 kref_init(&orig_entry->refcount);
1353 kref_get(&orig_entry->refcount);
1355 spin_lock_bh(&tt_global->list_lock);
1356 hlist_add_head_rcu(&orig_entry->list,
1357 &tt_global->orig_list);
1358 spin_unlock_bh(&tt_global->list_lock);
1359 atomic_inc(&tt_global->orig_list_count);
1363 batadv_tt_orig_list_entry_put(orig_entry);
1367 * batadv_tt_global_add - add a new TT global entry or update an existing one
1368 * @bat_priv: the bat priv with all the soft interface information
1369 * @orig_node: the originator announcing the client
1370 * @tt_addr: the mac address of the non-mesh client
1371 * @vid: VLAN identifier
1372 * @flags: TT flags that have to be set for this non-mesh client
1373 * @ttvn: the tt version number ever announcing this non-mesh client
1375 * Add a new TT global entry for the given originator. If the entry already
1376 * exists add a new reference to the given originator (a global entry can have
1377 * references to multiple originators) and adjust the flags attribute to reflect
1378 * the function argument.
1379 * If a TT local entry exists for this non-mesh client remove it.
1381 * The caller must hold orig_node refcount.
1383 * Return: true if the new entry has been added, false otherwise
1385 static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
1386 struct batadv_orig_node *orig_node,
1387 const unsigned char *tt_addr,
1388 unsigned short vid, u16 flags, u8 ttvn)
1390 struct batadv_tt_global_entry *tt_global_entry;
1391 struct batadv_tt_local_entry *tt_local_entry;
1394 struct batadv_tt_common_entry *common;
1397 /* ignore global entries from backbone nodes */
1398 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
1401 tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
1402 tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
1404 /* if the node already has a local client for this entry, it has to wait
1405 * for a roaming advertisement instead of manually messing up the global
1408 if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
1409 !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
1412 if (!tt_global_entry) {
1413 tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
1414 if (!tt_global_entry)
1417 common = &tt_global_entry->common;
1418 ether_addr_copy(common->addr, tt_addr);
1421 common->flags = flags;
1422 tt_global_entry->roam_at = 0;
1423 /* node must store current time in case of roaming. This is
1424 * needed to purge this entry out on timeout (if nobody claims
1427 if (flags & BATADV_TT_CLIENT_ROAM)
1428 tt_global_entry->roam_at = jiffies;
1429 kref_init(&common->refcount);
1430 kref_get(&common->refcount);
1431 common->added_at = jiffies;
1433 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
1434 atomic_set(&tt_global_entry->orig_list_count, 0);
1435 spin_lock_init(&tt_global_entry->list_lock);
1437 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
1439 batadv_choose_tt, common,
1440 &common->hash_entry);
1442 if (unlikely(hash_added != 0)) {
1443 /* remove the reference for the hash */
1444 batadv_tt_global_entry_put(tt_global_entry);
1448 common = &tt_global_entry->common;
1449 /* If there is already a global entry, we can use this one for
1451 * But if we are trying to add a temporary client then here are
1452 * two options at this point:
1453 * 1) the global client is not a temporary client: the global
1454 * client has to be left as it is, temporary information
1455 * should never override any already known client state
1456 * 2) the global client is a temporary client: purge the
1457 * originator list and add the new one orig_entry
1459 if (flags & BATADV_TT_CLIENT_TEMP) {
1460 if (!(common->flags & BATADV_TT_CLIENT_TEMP))
1462 if (batadv_tt_global_entry_has_orig(tt_global_entry,
1465 batadv_tt_global_del_orig_list(tt_global_entry);
1466 goto add_orig_entry;
1469 /* if the client was temporary added before receiving the first
1470 * OGM announcing it, we have to clear the TEMP flag. Also,
1471 * remove the previous temporary orig node and re-add it
1472 * if required. If the orig entry changed, the new one which
1473 * is a non-temporary entry is preferred.
1475 if (common->flags & BATADV_TT_CLIENT_TEMP) {
1476 batadv_tt_global_del_orig_list(tt_global_entry);
1477 common->flags &= ~BATADV_TT_CLIENT_TEMP;
1480 /* the change can carry possible "attribute" flags like the
1481 * TT_CLIENT_WIFI, therefore they have to be copied in the
1484 common->flags |= flags;
1486 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1487 * one originator left in the list and we previously received a
1488 * delete + roaming change for this originator.
1490 * We should first delete the old originator before adding the
1493 if (common->flags & BATADV_TT_CLIENT_ROAM) {
1494 batadv_tt_global_del_orig_list(tt_global_entry);
1495 common->flags &= ~BATADV_TT_CLIENT_ROAM;
1496 tt_global_entry->roam_at = 0;
1500 /* add the new orig_entry (if needed) or update it */
1501 batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);
1503 batadv_dbg(BATADV_DBG_TT, bat_priv,
1504 "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1505 common->addr, BATADV_PRINT_VID(common->vid),
1510 /* Do not remove multicast addresses from the local hash on
1513 if (is_multicast_ether_addr(tt_addr))
1516 /* remove address from local hash if present */
1517 local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
1518 "global tt received",
1519 flags & BATADV_TT_CLIENT_ROAM);
1520 tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
1522 if (!(flags & BATADV_TT_CLIENT_ROAM))
1523 /* this is a normal global add. Therefore the client is not in a
1524 * roaming state anymore.
1526 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
1529 if (tt_global_entry)
1530 batadv_tt_global_entry_put(tt_global_entry);
1532 batadv_tt_local_entry_put(tt_local_entry);
1537 * batadv_transtable_best_orig - Get best originator list entry from tt entry
1538 * @bat_priv: the bat priv with all the soft interface information
1539 * @tt_global_entry: global translation table entry to be analyzed
1541 * This functon assumes the caller holds rcu_read_lock().
1542 * Return: best originator list entry or NULL on errors.
1544 static struct batadv_tt_orig_list_entry *
1545 batadv_transtable_best_orig(struct batadv_priv *bat_priv,
1546 struct batadv_tt_global_entry *tt_global_entry)
1548 struct batadv_neigh_node *router, *best_router = NULL;
1549 struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1550 struct hlist_head *head;
1551 struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
1553 head = &tt_global_entry->orig_list;
1554 hlist_for_each_entry_rcu(orig_entry, head, list) {
1555 router = batadv_orig_router_get(orig_entry->orig_node,
1561 bao->bat_neigh_cmp(router, BATADV_IF_DEFAULT,
1562 best_router, BATADV_IF_DEFAULT) <= 0) {
1563 batadv_neigh_node_put(router);
1567 /* release the refcount for the "old" best */
1569 batadv_neigh_node_put(best_router);
1571 best_entry = orig_entry;
1572 best_router = router;
1576 batadv_neigh_node_put(best_router);
1582 * batadv_tt_global_print_entry - print all orig nodes who announce the address
1583 * for this global entry
1584 * @bat_priv: the bat priv with all the soft interface information
1585 * @tt_global_entry: global translation table entry to be printed
1586 * @seq: debugfs table seq_file struct
1588 * This functon assumes the caller holds rcu_read_lock().
1591 batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
1592 struct batadv_tt_global_entry *tt_global_entry,
1593 struct seq_file *seq)
1595 struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
1596 struct batadv_tt_common_entry *tt_common_entry;
1597 struct batadv_orig_node_vlan *vlan;
1598 struct hlist_head *head;
1602 tt_common_entry = &tt_global_entry->common;
1603 flags = tt_common_entry->flags;
1605 best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1607 vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
1608 tt_common_entry->vid);
1611 " * Cannot retrieve VLAN %d for originator %pM\n",
1612 BATADV_PRINT_VID(tt_common_entry->vid),
1613 best_entry->orig_node->orig);
1617 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
1619 " %c %pM %4i (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
1620 '*', tt_global_entry->common.addr,
1621 BATADV_PRINT_VID(tt_global_entry->common.vid),
1622 best_entry->ttvn, best_entry->orig_node->orig,
1623 last_ttvn, vlan->tt.crc,
1624 ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1625 ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1626 ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1627 ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1629 batadv_orig_node_vlan_put(vlan);
1633 head = &tt_global_entry->orig_list;
1635 hlist_for_each_entry_rcu(orig_entry, head, list) {
1636 if (best_entry == orig_entry)
1639 vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
1640 tt_common_entry->vid);
1643 " + Cannot retrieve VLAN %d for originator %pM\n",
1644 BATADV_PRINT_VID(tt_common_entry->vid),
1645 orig_entry->orig_node->orig);
1649 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
1651 " %c %pM %4d (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
1652 '+', tt_global_entry->common.addr,
1653 BATADV_PRINT_VID(tt_global_entry->common.vid),
1654 orig_entry->ttvn, orig_entry->orig_node->orig,
1655 last_ttvn, vlan->tt.crc,
1656 ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1657 ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1658 ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1659 ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1661 batadv_orig_node_vlan_put(vlan);
1665 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
1667 struct net_device *net_dev = (struct net_device *)seq->private;
1668 struct batadv_priv *bat_priv = netdev_priv(net_dev);
1669 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1670 struct batadv_tt_common_entry *tt_common_entry;
1671 struct batadv_tt_global_entry *tt_global;
1672 struct batadv_hard_iface *primary_if;
1673 struct hlist_head *head;
1676 primary_if = batadv_seq_print_text_primary_if_get(seq);
1681 "Globally announced TT entries received via the mesh %s\n",
1683 seq_printf(seq, " %-13s %s %s %-15s %s (%-10s) %s\n",
1684 "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1687 for (i = 0; i < hash->size; i++) {
1688 head = &hash->table[i];
1691 hlist_for_each_entry_rcu(tt_common_entry,
1693 tt_global = container_of(tt_common_entry,
1694 struct batadv_tt_global_entry,
1696 batadv_tt_global_print_entry(bat_priv, tt_global, seq);
1702 batadv_hardif_put(primary_if);
1707 * _batadv_tt_global_del_orig_entry - remove and free an orig_entry
1708 * @tt_global_entry: the global entry to remove the orig_entry from
1709 * @orig_entry: the orig entry to remove and free
1711 * Remove an orig_entry from its list in the given tt_global_entry and
1712 * free this orig_entry afterwards.
1714 * Caller must hold tt_global_entry->list_lock and ensure orig_entry->list is
1718 _batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
1719 struct batadv_tt_orig_list_entry *orig_entry)
1721 lockdep_assert_held(&tt_global_entry->list_lock);
1723 batadv_tt_global_size_dec(orig_entry->orig_node,
1724 tt_global_entry->common.vid);
1725 atomic_dec(&tt_global_entry->orig_list_count);
1726 /* requires holding tt_global_entry->list_lock and orig_entry->list
1727 * being part of a list
1729 hlist_del_rcu(&orig_entry->list);
1730 batadv_tt_orig_list_entry_put(orig_entry);
1733 /* deletes the orig list of a tt_global_entry */
1735 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
1737 struct hlist_head *head;
1738 struct hlist_node *safe;
1739 struct batadv_tt_orig_list_entry *orig_entry;
1741 spin_lock_bh(&tt_global_entry->list_lock);
1742 head = &tt_global_entry->orig_list;
1743 hlist_for_each_entry_safe(orig_entry, safe, head, list)
1744 _batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
1745 spin_unlock_bh(&tt_global_entry->list_lock);
1749 * batadv_tt_global_del_orig_node - remove orig_node from a global tt entry
1750 * @bat_priv: the bat priv with all the soft interface information
1751 * @tt_global_entry: the global entry to remove the orig_node from
1752 * @orig_node: the originator announcing the client
1753 * @message: message to append to the log on deletion
1755 * Remove the given orig_node and its according orig_entry from the given
1759 batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
1760 struct batadv_tt_global_entry *tt_global_entry,
1761 struct batadv_orig_node *orig_node,
1762 const char *message)
1764 struct hlist_head *head;
1765 struct hlist_node *safe;
1766 struct batadv_tt_orig_list_entry *orig_entry;
1769 spin_lock_bh(&tt_global_entry->list_lock);
1770 head = &tt_global_entry->orig_list;
1771 hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1772 if (orig_entry->orig_node == orig_node) {
1773 vid = tt_global_entry->common.vid;
1774 batadv_dbg(BATADV_DBG_TT, bat_priv,
1775 "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1777 tt_global_entry->common.addr,
1778 BATADV_PRINT_VID(vid), message);
1779 _batadv_tt_global_del_orig_entry(tt_global_entry,
1783 spin_unlock_bh(&tt_global_entry->list_lock);
1786 /* If the client is to be deleted, we check if it is the last origantor entry
1787 * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1788 * timer, otherwise we simply remove the originator scheduled for deletion.
1791 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
1792 struct batadv_tt_global_entry *tt_global_entry,
1793 struct batadv_orig_node *orig_node,
1794 const char *message)
1796 bool last_entry = true;
1797 struct hlist_head *head;
1798 struct batadv_tt_orig_list_entry *orig_entry;
1800 /* no local entry exists, case 1:
1801 * Check if this is the last one or if other entries exist.
1805 head = &tt_global_entry->orig_list;
1806 hlist_for_each_entry_rcu(orig_entry, head, list) {
1807 if (orig_entry->orig_node != orig_node) {
1815 /* its the last one, mark for roaming. */
1816 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1817 tt_global_entry->roam_at = jiffies;
1819 /* there is another entry, we can simply delete this
1820 * one and can still use the other one.
1822 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
1823 orig_node, message);
1827 * batadv_tt_global_del - remove a client from the global table
1828 * @bat_priv: the bat priv with all the soft interface information
1829 * @orig_node: an originator serving this client
1830 * @addr: the mac address of the client
1831 * @vid: VLAN identifier
1832 * @message: a message explaining the reason for deleting the client to print
1833 * for debugging purpose
1834 * @roaming: true if the deletion has been triggered by a roaming event
1836 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
1837 struct batadv_orig_node *orig_node,
1838 const unsigned char *addr, unsigned short vid,
1839 const char *message, bool roaming)
1841 struct batadv_tt_global_entry *tt_global_entry;
1842 struct batadv_tt_local_entry *local_entry = NULL;
1844 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1845 if (!tt_global_entry)
1849 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
1850 orig_node, message);
1852 if (hlist_empty(&tt_global_entry->orig_list))
1853 batadv_tt_global_free(bat_priv, tt_global_entry,
1859 /* if we are deleting a global entry due to a roam
1860 * event, there are two possibilities:
1861 * 1) the client roamed from node A to node B => if there
1862 * is only one originator left for this client, we mark
1863 * it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1864 * wait for node B to claim it. In case of timeout
1865 * the entry is purged.
1867 * If there are other originators left, we directly delete
1869 * 2) the client roamed to us => we can directly delete
1870 * the global entry, since it is useless now.
1872 local_entry = batadv_tt_local_hash_find(bat_priv,
1873 tt_global_entry->common.addr,
1876 /* local entry exists, case 2: client roamed to us. */
1877 batadv_tt_global_del_orig_list(tt_global_entry);
1878 batadv_tt_global_free(bat_priv, tt_global_entry, message);
1880 /* no local entry exists, case 1: check for roaming */
1881 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
1882 orig_node, message);
1885 if (tt_global_entry)
1886 batadv_tt_global_entry_put(tt_global_entry);
1888 batadv_tt_local_entry_put(local_entry);
1892 * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1893 * given originator matching the provided vid
1894 * @bat_priv: the bat priv with all the soft interface information
1895 * @orig_node: the originator owning the entries to remove
1896 * @match_vid: the VLAN identifier to match. If negative all the entries will be
1898 * @message: debug message to print as "reason"
1900 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
1901 struct batadv_orig_node *orig_node,
1903 const char *message)
1905 struct batadv_tt_global_entry *tt_global;
1906 struct batadv_tt_common_entry *tt_common_entry;
1908 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1909 struct hlist_node *safe;
1910 struct hlist_head *head;
1911 spinlock_t *list_lock; /* protects write access to the hash lists */
1917 for (i = 0; i < hash->size; i++) {
1918 head = &hash->table[i];
1919 list_lock = &hash->list_locks[i];
1921 spin_lock_bh(list_lock);
1922 hlist_for_each_entry_safe(tt_common_entry, safe,
1924 /* remove only matching entries */
1925 if (match_vid >= 0 && tt_common_entry->vid != match_vid)
1928 tt_global = container_of(tt_common_entry,
1929 struct batadv_tt_global_entry,
1932 batadv_tt_global_del_orig_node(bat_priv, tt_global,
1933 orig_node, message);
1935 if (hlist_empty(&tt_global->orig_list)) {
1936 vid = tt_global->common.vid;
1937 batadv_dbg(BATADV_DBG_TT, bat_priv,
1938 "Deleting global tt entry %pM (vid: %d): %s\n",
1939 tt_global->common.addr,
1940 BATADV_PRINT_VID(vid), message);
1941 hlist_del_rcu(&tt_common_entry->hash_entry);
1942 batadv_tt_global_entry_put(tt_global);
1945 spin_unlock_bh(list_lock);
1947 clear_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
1950 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
1954 unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
1955 unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
1957 if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
1958 batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
1960 *msg = "Roaming timeout\n";
1963 if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
1964 batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
1966 *msg = "Temporary client timeout\n";
1972 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
1974 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1975 struct hlist_head *head;
1976 struct hlist_node *node_tmp;
1977 spinlock_t *list_lock; /* protects write access to the hash lists */
1980 struct batadv_tt_common_entry *tt_common;
1981 struct batadv_tt_global_entry *tt_global;
1983 for (i = 0; i < hash->size; i++) {
1984 head = &hash->table[i];
1985 list_lock = &hash->list_locks[i];
1987 spin_lock_bh(list_lock);
1988 hlist_for_each_entry_safe(tt_common, node_tmp, head,
1990 tt_global = container_of(tt_common,
1991 struct batadv_tt_global_entry,
1994 if (!batadv_tt_global_to_purge(tt_global, &msg))
1997 batadv_dbg(BATADV_DBG_TT, bat_priv,
1998 "Deleting global tt entry %pM (vid: %d): %s\n",
1999 tt_global->common.addr,
2000 BATADV_PRINT_VID(tt_global->common.vid),
2003 hlist_del_rcu(&tt_common->hash_entry);
2005 batadv_tt_global_entry_put(tt_global);
2007 spin_unlock_bh(list_lock);
2011 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
2013 struct batadv_hashtable *hash;
2014 spinlock_t *list_lock; /* protects write access to the hash lists */
2015 struct batadv_tt_common_entry *tt_common_entry;
2016 struct batadv_tt_global_entry *tt_global;
2017 struct hlist_node *node_tmp;
2018 struct hlist_head *head;
2021 if (!bat_priv->tt.global_hash)
2024 hash = bat_priv->tt.global_hash;
2026 for (i = 0; i < hash->size; i++) {
2027 head = &hash->table[i];
2028 list_lock = &hash->list_locks[i];
2030 spin_lock_bh(list_lock);
2031 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
2033 hlist_del_rcu(&tt_common_entry->hash_entry);
2034 tt_global = container_of(tt_common_entry,
2035 struct batadv_tt_global_entry,
2037 batadv_tt_global_entry_put(tt_global);
2039 spin_unlock_bh(list_lock);
2042 batadv_hash_destroy(hash);
2044 bat_priv->tt.global_hash = NULL;
2048 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
2049 struct batadv_tt_global_entry *tt_global_entry)
2053 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
2054 tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
2057 /* check if the two clients are marked as isolated */
2058 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
2059 tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
2066 * batadv_transtable_search - get the mesh destination for a given client
2067 * @bat_priv: the bat priv with all the soft interface information
2068 * @src: mac address of the source client
2069 * @addr: mac address of the destination client
2070 * @vid: VLAN identifier
2072 * Return: a pointer to the originator that was selected as destination in the
2073 * mesh for contacting the client 'addr', NULL otherwise.
2074 * In case of multiple originators serving the same client, the function returns
2075 * the best one (best in terms of metric towards the destination node).
2077 * If the two clients are AP isolated the function returns NULL.
2079 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
2084 struct batadv_tt_local_entry *tt_local_entry = NULL;
2085 struct batadv_tt_global_entry *tt_global_entry = NULL;
2086 struct batadv_orig_node *orig_node = NULL;
2087 struct batadv_tt_orig_list_entry *best_entry;
2089 if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) {
2090 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
2091 if (!tt_local_entry ||
2092 (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
2096 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
2097 if (!tt_global_entry)
2100 /* check whether the clients should not communicate due to AP
2103 if (tt_local_entry &&
2104 _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
2108 best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
2109 /* found anything? */
2111 orig_node = best_entry->orig_node;
2112 if (orig_node && !kref_get_unless_zero(&orig_node->refcount))
2117 if (tt_global_entry)
2118 batadv_tt_global_entry_put(tt_global_entry);
2120 batadv_tt_local_entry_put(tt_local_entry);
2126 * batadv_tt_global_crc - calculates the checksum of the local table belonging
2127 * to the given orig_node
2128 * @bat_priv: the bat priv with all the soft interface information
2129 * @orig_node: originator for which the CRC should be computed
2130 * @vid: VLAN identifier for which the CRC32 has to be computed
2132 * This function computes the checksum for the global table corresponding to a
2133 * specific originator. In particular, the checksum is computed as follows: For
2134 * each client connected to the originator the CRC32C of the MAC address and the
2135 * VID is computed and then all the CRC32Cs of the various clients are xor'ed
2138 * The idea behind is that CRC32C should be used as much as possible in order to
2139 * produce a unique hash of the table, but since the order which is used to feed
2140 * the CRC32C function affects the result and since every node in the network
2141 * probably sorts the clients differently, the hash function cannot be directly
2142 * computed over the entire table. Hence the CRC32C is used only on
2143 * the single client entry, while all the results are then xor'ed together
2144 * because the XOR operation can combine them all while trying to reduce the
2145 * noise as much as possible.
2147 * Return: the checksum of the global table of a given originator.
2149 static u32 batadv_tt_global_crc(struct batadv_priv *bat_priv,
2150 struct batadv_orig_node *orig_node,
2153 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2154 struct batadv_tt_common_entry *tt_common;
2155 struct batadv_tt_global_entry *tt_global;
2156 struct hlist_head *head;
2157 u32 i, crc_tmp, crc = 0;
2161 for (i = 0; i < hash->size; i++) {
2162 head = &hash->table[i];
2165 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2166 tt_global = container_of(tt_common,
2167 struct batadv_tt_global_entry,
2169 /* compute the CRC only for entries belonging to the
2170 * VLAN identified by the vid passed as parameter
2172 if (tt_common->vid != vid)
2175 /* Roaming clients are in the global table for
2176 * consistency only. They don't have to be
2177 * taken into account while computing the
2180 if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
2182 /* Temporary clients have not been announced yet, so
2183 * they have to be skipped while computing the global
2186 if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
2189 /* find out if this global entry is announced by this
2192 if (!batadv_tt_global_entry_has_orig(tt_global,
2196 /* use network order to read the VID: this ensures that
2197 * every node reads the bytes in the same order.
2199 tmp_vid = htons(tt_common->vid);
2200 crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2202 /* compute the CRC on flags that have to be kept in sync
2205 flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2206 crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2208 crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2217 * batadv_tt_local_crc - calculates the checksum of the local table
2218 * @bat_priv: the bat priv with all the soft interface information
2219 * @vid: VLAN identifier for which the CRC32 has to be computed
2221 * For details about the computation, please refer to the documentation for
2222 * batadv_tt_global_crc().
2224 * Return: the checksum of the local table
2226 static u32 batadv_tt_local_crc(struct batadv_priv *bat_priv,
2229 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2230 struct batadv_tt_common_entry *tt_common;
2231 struct hlist_head *head;
2232 u32 i, crc_tmp, crc = 0;
2236 for (i = 0; i < hash->size; i++) {
2237 head = &hash->table[i];
2240 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2241 /* compute the CRC only for entries belonging to the
2242 * VLAN identified by vid
2244 if (tt_common->vid != vid)
2247 /* not yet committed clients have not to be taken into
2248 * account while computing the CRC
2250 if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2253 /* use network order to read the VID: this ensures that
2254 * every node reads the bytes in the same order.
2256 tmp_vid = htons(tt_common->vid);
2257 crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2259 /* compute the CRC on flags that have to be kept in sync
2262 flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2263 crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2265 crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2273 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2275 struct batadv_tt_req_node *node;
2276 struct hlist_node *safe;
2278 spin_lock_bh(&bat_priv->tt.req_list_lock);
2280 hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2281 hlist_del_init(&node->list);
2285 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2288 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2289 struct batadv_orig_node *orig_node,
2290 const void *tt_buff,
2293 /* Replace the old buffer only if I received something in the
2294 * last OGM (the OGM could carry no changes)
2296 spin_lock_bh(&orig_node->tt_buff_lock);
2297 if (tt_buff_len > 0) {
2298 kfree(orig_node->tt_buff);
2299 orig_node->tt_buff_len = 0;
2300 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2301 if (orig_node->tt_buff) {
2302 memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2303 orig_node->tt_buff_len = tt_buff_len;
2306 spin_unlock_bh(&orig_node->tt_buff_lock);
2309 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2311 struct batadv_tt_req_node *node;
2312 struct hlist_node *safe;
2314 spin_lock_bh(&bat_priv->tt.req_list_lock);
2315 hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2316 if (batadv_has_timed_out(node->issued_at,
2317 BATADV_TT_REQUEST_TIMEOUT)) {
2318 hlist_del_init(&node->list);
2322 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2326 * batadv_tt_req_node_new - search and possibly create a tt_req_node object
2327 * @bat_priv: the bat priv with all the soft interface information
2328 * @orig_node: orig node this request is being issued for
2330 * Return: the pointer to the new tt_req_node struct if no request
2331 * has already been issued for this orig_node, NULL otherwise.
2333 static struct batadv_tt_req_node *
2334 batadv_tt_req_node_new(struct batadv_priv *bat_priv,
2335 struct batadv_orig_node *orig_node)
2337 struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2339 spin_lock_bh(&bat_priv->tt.req_list_lock);
2340 hlist_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2341 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2342 !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2343 BATADV_TT_REQUEST_TIMEOUT))
2347 tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
2351 ether_addr_copy(tt_req_node->addr, orig_node->orig);
2352 tt_req_node->issued_at = jiffies;
2354 hlist_add_head(&tt_req_node->list, &bat_priv->tt.req_list);
2356 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2361 * batadv_tt_local_valid - verify that given tt entry is a valid one
2362 * @entry_ptr: to be checked local tt entry
2363 * @data_ptr: not used but definition required to satisfy the callback prototype
2365 * Return: 1 if the entry is a valid, 0 otherwise.
2367 static int batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
2369 const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2371 if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2376 static int batadv_tt_global_valid(const void *entry_ptr,
2377 const void *data_ptr)
2379 const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2380 const struct batadv_tt_global_entry *tt_global_entry;
2381 const struct batadv_orig_node *orig_node = data_ptr;
2383 if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2384 tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2387 tt_global_entry = container_of(tt_common_entry,
2388 struct batadv_tt_global_entry,
2391 return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
2395 * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2397 * @bat_priv: the bat priv with all the soft interface information
2398 * @hash: hash table containing the tt entries
2399 * @tt_len: expected tvlv tt data buffer length in number of bytes
2400 * @tvlv_buff: pointer to the buffer to fill with the TT data
2401 * @valid_cb: function to filter tt change entries
2402 * @cb_data: data passed to the filter function as argument
2404 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2405 struct batadv_hashtable *hash,
2406 void *tvlv_buff, u16 tt_len,
2407 int (*valid_cb)(const void *, const void *),
2410 struct batadv_tt_common_entry *tt_common_entry;
2411 struct batadv_tvlv_tt_change *tt_change;
2412 struct hlist_head *head;
2413 u16 tt_tot, tt_num_entries = 0;
2416 tt_tot = batadv_tt_entries(tt_len);
2417 tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
2420 for (i = 0; i < hash->size; i++) {
2421 head = &hash->table[i];
2423 hlist_for_each_entry_rcu(tt_common_entry,
2425 if (tt_tot == tt_num_entries)
2428 if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
2431 ether_addr_copy(tt_change->addr, tt_common_entry->addr);
2432 tt_change->flags = tt_common_entry->flags;
2433 tt_change->vid = htons(tt_common_entry->vid);
2434 memset(tt_change->reserved, 0,
2435 sizeof(tt_change->reserved));
2445 * batadv_tt_global_check_crc - check if all the CRCs are correct
2446 * @orig_node: originator for which the CRCs have to be checked
2447 * @tt_vlan: pointer to the first tvlv VLAN entry
2448 * @num_vlan: number of tvlv VLAN entries
2450 * Return: true if all the received CRCs match the locally stored ones, false
2453 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
2454 struct batadv_tvlv_tt_vlan_data *tt_vlan,
2457 struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
2458 struct batadv_orig_node_vlan *vlan;
2459 int i, orig_num_vlan;
2462 /* check if each received CRC matches the locally stored one */
2463 for (i = 0; i < num_vlan; i++) {
2464 tt_vlan_tmp = tt_vlan + i;
2466 /* if orig_node is a backbone node for this VLAN, don't check
2467 * the CRC as we ignore all the global entries over it
2469 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
2471 ntohs(tt_vlan_tmp->vid)))
2474 vlan = batadv_orig_node_vlan_get(orig_node,
2475 ntohs(tt_vlan_tmp->vid));
2480 batadv_orig_node_vlan_put(vlan);
2482 if (crc != ntohl(tt_vlan_tmp->crc))
2486 /* check if any excess VLANs exist locally for the originator
2487 * which are not mentioned in the TVLV from the originator.
2491 hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list)
2495 if (orig_num_vlan > num_vlan)
2502 * batadv_tt_local_update_crc - update all the local CRCs
2503 * @bat_priv: the bat priv with all the soft interface information
2505 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
2507 struct batadv_softif_vlan *vlan;
2509 /* recompute the global CRC for each VLAN */
2511 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
2512 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
2518 * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2519 * @bat_priv: the bat priv with all the soft interface information
2520 * @orig_node: the orig_node for which the CRCs have to be updated
2522 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
2523 struct batadv_orig_node *orig_node)
2525 struct batadv_orig_node_vlan *vlan;
2528 /* recompute the global CRC for each VLAN */
2530 hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
2531 /* if orig_node is a backbone node for this VLAN, don't compute
2532 * the CRC as we ignore all the global entries over it
2534 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
2538 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
2545 * batadv_send_tt_request - send a TT Request message to a given node
2546 * @bat_priv: the bat priv with all the soft interface information
2547 * @dst_orig_node: the destination of the message
2548 * @ttvn: the version number that the source of the message is looking for
2549 * @tt_vlan: pointer to the first tvlv VLAN object to request
2550 * @num_vlan: number of tvlv VLAN entries
2551 * @full_table: ask for the entire translation table if true, while only for the
2552 * last TT diff otherwise
2554 * Return: true if the TT Request was sent, false otherwise
2556 static int batadv_send_tt_request(struct batadv_priv *bat_priv,
2557 struct batadv_orig_node *dst_orig_node,
2559 struct batadv_tvlv_tt_vlan_data *tt_vlan,
2560 u16 num_vlan, bool full_table)
2562 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2563 struct batadv_tt_req_node *tt_req_node = NULL;
2564 struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
2565 struct batadv_hard_iface *primary_if;
2569 primary_if = batadv_primary_if_get_selected(bat_priv);
2573 /* The new tt_req will be issued only if I'm not waiting for a
2574 * reply from the same orig_node yet
2576 tt_req_node = batadv_tt_req_node_new(bat_priv, dst_orig_node);
2580 size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
2581 tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
2585 tvlv_tt_data->flags = BATADV_TT_REQUEST;
2586 tvlv_tt_data->ttvn = ttvn;
2587 tvlv_tt_data->num_vlan = htons(num_vlan);
2589 /* send all the CRCs within the request. This is needed by intermediate
2590 * nodes to ensure they have the correct table before replying
2592 tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
2593 for (i = 0; i < num_vlan; i++) {
2594 tt_vlan_req->vid = tt_vlan->vid;
2595 tt_vlan_req->crc = tt_vlan->crc;
2602 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2604 batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
2605 dst_orig_node->orig, full_table ? 'F' : '.');
2607 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
2608 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2609 dst_orig_node->orig, BATADV_TVLV_TT, 1,
2610 tvlv_tt_data, size);
2615 batadv_hardif_put(primary_if);
2616 if (ret && tt_req_node) {
2617 spin_lock_bh(&bat_priv->tt.req_list_lock);
2618 /* hlist_del_init() verifies tt_req_node still is in the list */
2619 hlist_del_init(&tt_req_node->list);
2620 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2623 kfree(tvlv_tt_data);
2628 * batadv_send_other_tt_response - send reply to tt request concerning another
2629 * node's translation table
2630 * @bat_priv: the bat priv with all the soft interface information
2631 * @tt_data: tt data containing the tt request information
2632 * @req_src: mac address of tt request sender
2633 * @req_dst: mac address of tt request recipient
2635 * Return: true if tt request reply was sent, false otherwise.
2637 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
2638 struct batadv_tvlv_tt_data *tt_data,
2639 u8 *req_src, u8 *req_dst)
2641 struct batadv_orig_node *req_dst_orig_node;
2642 struct batadv_orig_node *res_dst_orig_node = NULL;
2643 struct batadv_tvlv_tt_change *tt_change;
2644 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2645 struct batadv_tvlv_tt_vlan_data *tt_vlan;
2646 bool ret = false, full_table;
2647 u8 orig_ttvn, req_ttvn;
2651 batadv_dbg(BATADV_DBG_TT, bat_priv,
2652 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2653 req_src, tt_data->ttvn, req_dst,
2654 ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2656 /* Let's get the orig node of the REAL destination */
2657 req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
2658 if (!req_dst_orig_node)
2661 res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
2662 if (!res_dst_orig_node)
2665 orig_ttvn = (u8)atomic_read(&req_dst_orig_node->last_ttvn);
2666 req_ttvn = tt_data->ttvn;
2668 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
2669 /* this node doesn't have the requested data */
2670 if (orig_ttvn != req_ttvn ||
2671 !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
2672 ntohs(tt_data->num_vlan)))
2675 /* If the full table has been explicitly requested */
2676 if (tt_data->flags & BATADV_TT_FULL_TABLE ||
2677 !req_dst_orig_node->tt_buff)
2682 /* TT fragmentation hasn't been implemented yet, so send as many
2683 * TT entries fit a single packet as possible only
2686 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
2687 tt_len = req_dst_orig_node->tt_buff_len;
2689 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2696 /* Copy the last orig_node's OGM buffer */
2697 memcpy(tt_change, req_dst_orig_node->tt_buff,
2698 req_dst_orig_node->tt_buff_len);
2699 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2701 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2702 * in the initial part
2705 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2712 /* fill the rest of the tvlv with the real TT entries */
2713 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
2715 batadv_tt_global_valid,
2719 /* Don't send the response, if larger than fragmented packet. */
2720 tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
2721 if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
2722 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
2723 "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
2724 res_dst_orig_node->orig);
2728 tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2729 tvlv_tt_data->ttvn = req_ttvn;
2732 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2734 batadv_dbg(BATADV_DBG_TT, bat_priv,
2735 "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2736 res_dst_orig_node->orig, req_dst_orig_node->orig,
2737 full_table ? 'F' : '.', req_ttvn);
2739 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2741 batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
2742 req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2749 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2752 if (res_dst_orig_node)
2753 batadv_orig_node_put(res_dst_orig_node);
2754 if (req_dst_orig_node)
2755 batadv_orig_node_put(req_dst_orig_node);
2756 kfree(tvlv_tt_data);
2761 * batadv_send_my_tt_response - send reply to tt request concerning this node's
2763 * @bat_priv: the bat priv with all the soft interface information
2764 * @tt_data: tt data containing the tt request information
2765 * @req_src: mac address of tt request sender
2767 * Return: true if tt request reply was sent, false otherwise.
2769 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
2770 struct batadv_tvlv_tt_data *tt_data,
2773 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2774 struct batadv_hard_iface *primary_if = NULL;
2775 struct batadv_tvlv_tt_change *tt_change;
2776 struct batadv_orig_node *orig_node;
2777 u8 my_ttvn, req_ttvn;
2782 batadv_dbg(BATADV_DBG_TT, bat_priv,
2783 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2784 req_src, tt_data->ttvn,
2785 ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2787 spin_lock_bh(&bat_priv->tt.commit_lock);
2789 my_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
2790 req_ttvn = tt_data->ttvn;
2792 orig_node = batadv_orig_hash_find(bat_priv, req_src);
2796 primary_if = batadv_primary_if_get_selected(bat_priv);
2800 /* If the full table has been explicitly requested or the gap
2801 * is too big send the whole local translation table
2803 if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
2804 !bat_priv->tt.last_changeset)
2809 /* TT fragmentation hasn't been implemented yet, so send as many
2810 * TT entries fit a single packet as possible only
2813 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
2815 tt_len = bat_priv->tt.last_changeset_len;
2816 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2823 /* Copy the last orig_node's OGM buffer */
2824 memcpy(tt_change, bat_priv->tt.last_changeset,
2825 bat_priv->tt.last_changeset_len);
2826 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2828 req_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
2830 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2831 * in the initial part
2834 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2841 /* fill the rest of the tvlv with the real TT entries */
2842 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
2844 batadv_tt_local_valid, NULL);
2847 tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2848 tvlv_tt_data->ttvn = req_ttvn;
2851 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2853 batadv_dbg(BATADV_DBG_TT, bat_priv,
2854 "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2855 orig_node->orig, full_table ? 'F' : '.', req_ttvn);
2857 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2859 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2860 req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2866 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2868 spin_unlock_bh(&bat_priv->tt.commit_lock);
2870 batadv_orig_node_put(orig_node);
2872 batadv_hardif_put(primary_if);
2873 kfree(tvlv_tt_data);
2874 /* The packet was for this host, so it doesn't need to be re-routed */
2879 * batadv_send_tt_response - send reply to tt request
2880 * @bat_priv: the bat priv with all the soft interface information
2881 * @tt_data: tt data containing the tt request information
2882 * @req_src: mac address of tt request sender
2883 * @req_dst: mac address of tt request recipient
2885 * Return: true if tt request reply was sent, false otherwise.
2887 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
2888 struct batadv_tvlv_tt_data *tt_data,
2889 u8 *req_src, u8 *req_dst)
2891 if (batadv_is_my_mac(bat_priv, req_dst))
2892 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
2893 return batadv_send_other_tt_response(bat_priv, tt_data, req_src,
2897 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
2898 struct batadv_orig_node *orig_node,
2899 struct batadv_tvlv_tt_change *tt_change,
2900 u16 tt_num_changes, u8 ttvn)
2905 for (i = 0; i < tt_num_changes; i++) {
2906 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
2907 roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
2908 batadv_tt_global_del(bat_priv, orig_node,
2909 (tt_change + i)->addr,
2910 ntohs((tt_change + i)->vid),
2911 "tt removed by changes",
2914 if (!batadv_tt_global_add(bat_priv, orig_node,
2915 (tt_change + i)->addr,
2916 ntohs((tt_change + i)->vid),
2917 (tt_change + i)->flags, ttvn))
2918 /* In case of problem while storing a
2919 * global_entry, we stop the updating
2920 * procedure without committing the
2921 * ttvn change. This will avoid to send
2922 * corrupted data on tt_request
2927 set_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
2930 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
2931 struct batadv_tvlv_tt_change *tt_change,
2932 u8 ttvn, u8 *resp_src,
2935 struct batadv_orig_node *orig_node;
2937 orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2941 /* Purge the old table first.. */
2942 batadv_tt_global_del_orig(bat_priv, orig_node, -1,
2943 "Received full table");
2945 _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
2948 spin_lock_bh(&orig_node->tt_buff_lock);
2949 kfree(orig_node->tt_buff);
2950 orig_node->tt_buff_len = 0;
2951 orig_node->tt_buff = NULL;
2952 spin_unlock_bh(&orig_node->tt_buff_lock);
2954 atomic_set(&orig_node->last_ttvn, ttvn);
2958 batadv_orig_node_put(orig_node);
2961 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
2962 struct batadv_orig_node *orig_node,
2963 u16 tt_num_changes, u8 ttvn,
2964 struct batadv_tvlv_tt_change *tt_change)
2966 _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
2967 tt_num_changes, ttvn);
2969 batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
2970 batadv_tt_len(tt_num_changes));
2971 atomic_set(&orig_node->last_ttvn, ttvn);
2975 * batadv_is_my_client - check if a client is served by the local node
2976 * @bat_priv: the bat priv with all the soft interface information
2977 * @addr: the mac address of the client to check
2978 * @vid: VLAN identifier
2980 * Return: true if the client is served by this node, false otherwise.
2982 bool batadv_is_my_client(struct batadv_priv *bat_priv, const u8 *addr,
2985 struct batadv_tt_local_entry *tt_local_entry;
2988 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
2989 if (!tt_local_entry)
2991 /* Check if the client has been logically deleted (but is kept for
2992 * consistency purpose)
2994 if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
2995 (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
3000 batadv_tt_local_entry_put(tt_local_entry);
3005 * batadv_handle_tt_response - process incoming tt reply
3006 * @bat_priv: the bat priv with all the soft interface information
3007 * @tt_data: tt data containing the tt request information
3008 * @resp_src: mac address of tt reply sender
3009 * @num_entries: number of tt change entries appended to the tt data
3011 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
3012 struct batadv_tvlv_tt_data *tt_data,
3013 u8 *resp_src, u16 num_entries)
3015 struct batadv_tt_req_node *node;
3016 struct hlist_node *safe;
3017 struct batadv_orig_node *orig_node = NULL;
3018 struct batadv_tvlv_tt_change *tt_change;
3019 u8 *tvlv_ptr = (u8 *)tt_data;
3022 batadv_dbg(BATADV_DBG_TT, bat_priv,
3023 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
3024 resp_src, tt_data->ttvn, num_entries,
3025 ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3027 orig_node = batadv_orig_hash_find(bat_priv, resp_src);
3031 spin_lock_bh(&orig_node->tt_lock);
3033 change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
3034 change_offset *= ntohs(tt_data->num_vlan);
3035 change_offset += sizeof(*tt_data);
3036 tvlv_ptr += change_offset;
3038 tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
3039 if (tt_data->flags & BATADV_TT_FULL_TABLE) {
3040 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
3041 resp_src, num_entries);
3043 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
3044 tt_data->ttvn, tt_change);
3047 /* Recalculate the CRC for this orig_node and store it */
3048 batadv_tt_global_update_crc(bat_priv, orig_node);
3050 spin_unlock_bh(&orig_node->tt_lock);
3052 /* Delete the tt_req_node from pending tt_requests list */
3053 spin_lock_bh(&bat_priv->tt.req_list_lock);
3054 hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
3055 if (!batadv_compare_eth(node->addr, resp_src))
3057 hlist_del_init(&node->list);
3061 spin_unlock_bh(&bat_priv->tt.req_list_lock);
3064 batadv_orig_node_put(orig_node);
3067 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
3069 struct batadv_tt_roam_node *node, *safe;
3071 spin_lock_bh(&bat_priv->tt.roam_list_lock);
3073 list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3074 list_del(&node->list);
3078 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3081 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
3083 struct batadv_tt_roam_node *node, *safe;
3085 spin_lock_bh(&bat_priv->tt.roam_list_lock);
3086 list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3087 if (!batadv_has_timed_out(node->first_time,
3088 BATADV_ROAMING_MAX_TIME))
3091 list_del(&node->list);
3094 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3098 * batadv_tt_check_roam_count - check if a client has roamed too frequently
3099 * @bat_priv: the bat priv with all the soft interface information
3100 * @client: mac address of the roaming client
3102 * This function checks whether the client already reached the
3103 * maximum number of possible roaming phases. In this case the ROAMING_ADV
3106 * Return: true if the ROAMING_ADV can be sent, false otherwise
3108 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, u8 *client)
3110 struct batadv_tt_roam_node *tt_roam_node;
3113 spin_lock_bh(&bat_priv->tt.roam_list_lock);
3114 /* The new tt_req will be issued only if I'm not waiting for a
3115 * reply from the same orig_node yet
3117 list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
3118 if (!batadv_compare_eth(tt_roam_node->addr, client))
3121 if (batadv_has_timed_out(tt_roam_node->first_time,
3122 BATADV_ROAMING_MAX_TIME))
3125 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
3126 /* Sorry, you roamed too many times! */
3133 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
3137 tt_roam_node->first_time = jiffies;
3138 atomic_set(&tt_roam_node->counter,
3139 BATADV_ROAMING_MAX_COUNT - 1);
3140 ether_addr_copy(tt_roam_node->addr, client);
3142 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
3147 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3152 * batadv_send_roam_adv - send a roaming advertisement message
3153 * @bat_priv: the bat priv with all the soft interface information
3154 * @client: mac address of the roaming client
3155 * @vid: VLAN identifier
3156 * @orig_node: message destination
3158 * Send a ROAMING_ADV message to the node which was previously serving this
3159 * client. This is done to inform the node that from now on all traffic destined
3160 * for this particular roamed client has to be forwarded to the sender of the
3163 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
3165 struct batadv_orig_node *orig_node)
3167 struct batadv_hard_iface *primary_if;
3168 struct batadv_tvlv_roam_adv tvlv_roam;
3170 primary_if = batadv_primary_if_get_selected(bat_priv);
3174 /* before going on we have to check whether the client has
3175 * already roamed to us too many times
3177 if (!batadv_tt_check_roam_count(bat_priv, client))
3180 batadv_dbg(BATADV_DBG_TT, bat_priv,
3181 "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
3182 orig_node->orig, client, BATADV_PRINT_VID(vid));
3184 batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
3186 memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
3187 tvlv_roam.vid = htons(vid);
3189 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3190 orig_node->orig, BATADV_TVLV_ROAM, 1,
3191 &tvlv_roam, sizeof(tvlv_roam));
3195 batadv_hardif_put(primary_if);
3198 static void batadv_tt_purge(struct work_struct *work)
3200 struct delayed_work *delayed_work;
3201 struct batadv_priv_tt *priv_tt;
3202 struct batadv_priv *bat_priv;
3204 delayed_work = container_of(work, struct delayed_work, work);
3205 priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
3206 bat_priv = container_of(priv_tt, struct batadv_priv, tt);
3208 batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
3209 batadv_tt_global_purge(bat_priv);
3210 batadv_tt_req_purge(bat_priv);
3211 batadv_tt_roam_purge(bat_priv);
3213 queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3214 msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3217 void batadv_tt_free(struct batadv_priv *bat_priv)
3219 batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
3220 batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
3222 cancel_delayed_work_sync(&bat_priv->tt.work);
3224 batadv_tt_local_table_free(bat_priv);
3225 batadv_tt_global_table_free(bat_priv);
3226 batadv_tt_req_list_free(bat_priv);
3227 batadv_tt_changes_list_free(bat_priv);
3228 batadv_tt_roam_list_free(bat_priv);
3230 kfree(bat_priv->tt.last_changeset);
3234 * batadv_tt_local_set_flags - set or unset the specified flags on the local
3235 * table and possibly count them in the TT size
3236 * @bat_priv: the bat priv with all the soft interface information
3237 * @flags: the flag to switch
3238 * @enable: whether to set or unset the flag
3239 * @count: whether to increase the TT size by the number of changed entries
3241 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv, u16 flags,
3242 bool enable, bool count)
3244 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3245 struct batadv_tt_common_entry *tt_common_entry;
3246 u16 changed_num = 0;
3247 struct hlist_head *head;
3253 for (i = 0; i < hash->size; i++) {
3254 head = &hash->table[i];
3257 hlist_for_each_entry_rcu(tt_common_entry,
3260 if ((tt_common_entry->flags & flags) == flags)
3262 tt_common_entry->flags |= flags;
3264 if (!(tt_common_entry->flags & flags))
3266 tt_common_entry->flags &= ~flags;
3273 batadv_tt_local_size_inc(bat_priv,
3274 tt_common_entry->vid);
3280 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3281 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3283 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3284 struct batadv_tt_common_entry *tt_common;
3285 struct batadv_tt_local_entry *tt_local;
3286 struct hlist_node *node_tmp;
3287 struct hlist_head *head;
3288 spinlock_t *list_lock; /* protects write access to the hash lists */
3294 for (i = 0; i < hash->size; i++) {
3295 head = &hash->table[i];
3296 list_lock = &hash->list_locks[i];
3298 spin_lock_bh(list_lock);
3299 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3301 if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3304 batadv_dbg(BATADV_DBG_TT, bat_priv,
3305 "Deleting local tt entry (%pM, vid: %d): pending\n",
3307 BATADV_PRINT_VID(tt_common->vid));
3309 batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3310 hlist_del_rcu(&tt_common->hash_entry);
3311 tt_local = container_of(tt_common,
3312 struct batadv_tt_local_entry,
3315 batadv_tt_local_entry_put(tt_local);
3317 spin_unlock_bh(list_lock);
3322 * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3323 * which have been queued in the time since the last commit
3324 * @bat_priv: the bat priv with all the soft interface information
3326 * Caller must hold tt->commit_lock.
3328 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3330 lockdep_assert_held(&bat_priv->tt.commit_lock);
3332 /* Update multicast addresses in local translation table */
3333 batadv_mcast_mla_update(bat_priv);
3335 if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3336 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3337 batadv_tt_tvlv_container_update(bat_priv);
3341 batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3343 batadv_tt_local_purge_pending_clients(bat_priv);
3344 batadv_tt_local_update_crc(bat_priv);
3346 /* Increment the TTVN only once per OGM interval */
3347 atomic_inc(&bat_priv->tt.vn);
3348 batadv_dbg(BATADV_DBG_TT, bat_priv,
3349 "Local changes committed, updating to ttvn %u\n",
3350 (u8)atomic_read(&bat_priv->tt.vn));
3352 /* reset the sending counter */
3353 atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3354 batadv_tt_tvlv_container_update(bat_priv);
3358 * batadv_tt_local_commit_changes - commit all pending local tt changes which
3359 * have been queued in the time since the last commit
3360 * @bat_priv: the bat priv with all the soft interface information
3362 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3364 spin_lock_bh(&bat_priv->tt.commit_lock);
3365 batadv_tt_local_commit_changes_nolock(bat_priv);
3366 spin_unlock_bh(&bat_priv->tt.commit_lock);
3369 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, u8 *src, u8 *dst,
3372 struct batadv_tt_local_entry *tt_local_entry = NULL;
3373 struct batadv_tt_global_entry *tt_global_entry = NULL;
3374 struct batadv_softif_vlan *vlan;
3377 vlan = batadv_softif_vlan_get(bat_priv, vid);
3381 if (!atomic_read(&vlan->ap_isolation))
3384 tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3385 if (!tt_local_entry)
3388 tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
3389 if (!tt_global_entry)
3392 if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3398 batadv_softif_vlan_put(vlan);
3399 if (tt_global_entry)
3400 batadv_tt_global_entry_put(tt_global_entry);
3402 batadv_tt_local_entry_put(tt_local_entry);
3407 * batadv_tt_update_orig - update global translation table with new tt
3408 * information received via ogms
3409 * @bat_priv: the bat priv with all the soft interface information
3410 * @orig_node: the orig_node of the ogm
3411 * @tt_buff: pointer to the first tvlv VLAN entry
3412 * @tt_num_vlan: number of tvlv VLAN entries
3413 * @tt_change: pointer to the first entry in the TT buffer
3414 * @tt_num_changes: number of tt changes inside the tt buffer
3415 * @ttvn: translation table version number of this changeset
3417 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
3418 struct batadv_orig_node *orig_node,
3419 const void *tt_buff, u16 tt_num_vlan,
3420 struct batadv_tvlv_tt_change *tt_change,
3421 u16 tt_num_changes, u8 ttvn)
3423 u8 orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn);
3424 struct batadv_tvlv_tt_vlan_data *tt_vlan;
3425 bool full_table = true;
3428 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
3429 has_tt_init = test_bit(BATADV_ORIG_CAPA_HAS_TT,
3430 &orig_node->capa_initialized);
3432 /* orig table not initialised AND first diff is in the OGM OR the ttvn
3433 * increased by one -> we can apply the attached changes
3435 if ((!has_tt_init && ttvn == 1) || ttvn - orig_ttvn == 1) {
3436 /* the OGM could not contain the changes due to their size or
3437 * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3439 * In this case send a tt request
3441 if (!tt_num_changes) {
3446 spin_lock_bh(&orig_node->tt_lock);
3448 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
3451 /* Even if we received the precomputed crc with the OGM, we
3452 * prefer to recompute it to spot any possible inconsistency
3453 * in the global table
3455 batadv_tt_global_update_crc(bat_priv, orig_node);
3457 spin_unlock_bh(&orig_node->tt_lock);
3459 /* The ttvn alone is not enough to guarantee consistency
3460 * because a single value could represent different states
3461 * (due to the wrap around). Thus a node has to check whether
3462 * the resulting table (after applying the changes) is still
3463 * consistent or not. E.g. a node could disconnect while its
3464 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3465 * checking the CRC value is mandatory to detect the
3468 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
3472 /* if we missed more than one change or our tables are not
3473 * in sync anymore -> request fresh tt data
3475 if (!has_tt_init || ttvn != orig_ttvn ||
3476 !batadv_tt_global_check_crc(orig_node, tt_vlan,
3479 batadv_dbg(BATADV_DBG_TT, bat_priv,
3480 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3481 orig_node->orig, ttvn, orig_ttvn,
3483 batadv_send_tt_request(bat_priv, orig_node, ttvn,
3484 tt_vlan, tt_num_vlan,
3492 * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3493 * @bat_priv: the bat priv with all the soft interface information
3494 * @addr: the mac address of the client to check
3495 * @vid: VLAN identifier
3497 * Return: true if we know that the client has moved from its old originator
3498 * to another one. This entry is still kept for consistency purposes and will be
3499 * deleted later by a DEL or because of timeout
3501 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
3502 u8 *addr, unsigned short vid)
3504 struct batadv_tt_global_entry *tt_global_entry;
3507 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
3508 if (!tt_global_entry)
3511 ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3512 batadv_tt_global_entry_put(tt_global_entry);
3518 * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3519 * @bat_priv: the bat priv with all the soft interface information
3520 * @addr: the mac address of the local client to query
3521 * @vid: VLAN identifier
3523 * Return: true if the local client is known to be roaming (it is not served by
3524 * this node anymore) or not. If yes, the client is still present in the table
3525 * to keep the latter consistent with the node TTVN
3527 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
3528 u8 *addr, unsigned short vid)
3530 struct batadv_tt_local_entry *tt_local_entry;
3533 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3534 if (!tt_local_entry)
3537 ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3538 batadv_tt_local_entry_put(tt_local_entry);
3543 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
3544 struct batadv_orig_node *orig_node,
3545 const unsigned char *addr,
3550 if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
3551 BATADV_TT_CLIENT_TEMP,
3552 atomic_read(&orig_node->last_ttvn)))
3555 batadv_dbg(BATADV_DBG_TT, bat_priv,
3556 "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3557 addr, BATADV_PRINT_VID(vid), orig_node->orig);
3564 * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
3565 * maximum packet size that can be transported through the mesh
3566 * @soft_iface: netdev struct of the mesh interface
3568 * Remove entries older than 'timeout' and half timeout if more entries need
3571 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
3573 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
3574 int packet_size_max = atomic_read(&bat_priv->packet_size_max);
3575 int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
3576 bool reduced = false;
3578 spin_lock_bh(&bat_priv->tt.commit_lock);
3581 table_size = batadv_tt_local_table_transmit_size(bat_priv);
3582 if (packet_size_max >= table_size)
3585 batadv_tt_local_purge(bat_priv, timeout);
3586 batadv_tt_local_purge_pending_clients(bat_priv);
3590 net_ratelimited_function(batadv_info, soft_iface,
3591 "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3595 /* commit these changes immediately, to avoid synchronization problem
3599 batadv_tt_local_commit_changes_nolock(bat_priv);
3601 spin_unlock_bh(&bat_priv->tt.commit_lock);
3605 * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3606 * @bat_priv: the bat priv with all the soft interface information
3607 * @orig: the orig_node of the ogm
3608 * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3609 * @tvlv_value: tvlv buffer containing the gateway data
3610 * @tvlv_value_len: tvlv buffer length
3612 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
3613 struct batadv_orig_node *orig,
3614 u8 flags, void *tvlv_value,
3617 struct batadv_tvlv_tt_vlan_data *tt_vlan;
3618 struct batadv_tvlv_tt_change *tt_change;
3619 struct batadv_tvlv_tt_data *tt_data;
3620 u16 num_entries, num_vlan;
3622 if (tvlv_value_len < sizeof(*tt_data))
3625 tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3626 tvlv_value_len -= sizeof(*tt_data);
3628 num_vlan = ntohs(tt_data->num_vlan);
3630 if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
3633 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3634 tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
3635 tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
3637 num_entries = batadv_tt_entries(tvlv_value_len);
3639 batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
3640 num_entries, tt_data->ttvn);
3644 * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3646 * @bat_priv: the bat priv with all the soft interface information
3647 * @src: mac address of tt tvlv sender
3648 * @dst: mac address of tt tvlv recipient
3649 * @tvlv_value: tvlv buffer containing the tt data
3650 * @tvlv_value_len: tvlv buffer length
3652 * Return: NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3655 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3660 struct batadv_tvlv_tt_data *tt_data;
3661 u16 tt_vlan_len, tt_num_entries;
3665 if (tvlv_value_len < sizeof(*tt_data))
3666 return NET_RX_SUCCESS;
3668 tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3669 tvlv_value_len -= sizeof(*tt_data);
3671 tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
3672 tt_vlan_len *= ntohs(tt_data->num_vlan);
3674 if (tvlv_value_len < tt_vlan_len)
3675 return NET_RX_SUCCESS;
3677 tvlv_value_len -= tt_vlan_len;
3678 tt_num_entries = batadv_tt_entries(tvlv_value_len);
3680 switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
3681 case BATADV_TT_REQUEST:
3682 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
3684 /* If this node cannot provide a TT response the tt_request is
3687 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
3689 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3694 batadv_dbg(BATADV_DBG_TT, bat_priv,
3695 "Routing TT_REQUEST to %pM [%c]\n",
3697 /* tvlv API will re-route the packet */
3701 case BATADV_TT_RESPONSE:
3702 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
3704 if (batadv_is_my_mac(bat_priv, dst)) {
3705 batadv_handle_tt_response(bat_priv, tt_data,
3706 src, tt_num_entries);
3707 return NET_RX_SUCCESS;
3710 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3715 batadv_dbg(BATADV_DBG_TT, bat_priv,
3716 "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
3718 /* tvlv API will re-route the packet */
3722 return NET_RX_SUCCESS;
3726 * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3727 * @bat_priv: the bat priv with all the soft interface information
3728 * @src: mac address of tt tvlv sender
3729 * @dst: mac address of tt tvlv recipient
3730 * @tvlv_value: tvlv buffer containing the tt data
3731 * @tvlv_value_len: tvlv buffer length
3733 * Return: NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3736 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3741 struct batadv_tvlv_roam_adv *roaming_adv;
3742 struct batadv_orig_node *orig_node = NULL;
3744 /* If this node is not the intended recipient of the
3745 * roaming advertisement the packet is forwarded
3746 * (the tvlv API will re-route the packet).
3748 if (!batadv_is_my_mac(bat_priv, dst))
3751 if (tvlv_value_len < sizeof(*roaming_adv))
3754 orig_node = batadv_orig_hash_find(bat_priv, src);
3758 batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
3759 roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
3761 batadv_dbg(BATADV_DBG_TT, bat_priv,
3762 "Received ROAMING_ADV from %pM (client %pM)\n",
3763 src, roaming_adv->client);
3765 batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
3766 ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
3767 atomic_read(&orig_node->last_ttvn) + 1);
3771 batadv_orig_node_put(orig_node);
3772 return NET_RX_SUCCESS;
3776 * batadv_tt_init - initialise the translation table internals
3777 * @bat_priv: the bat priv with all the soft interface information
3779 * Return: 0 on success or negative error number in case of failure.
3781 int batadv_tt_init(struct batadv_priv *bat_priv)
3785 /* synchronized flags must be remote */
3786 BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
3788 ret = batadv_tt_local_init(bat_priv);
3792 ret = batadv_tt_global_init(bat_priv);
3796 batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
3797 batadv_tt_tvlv_unicast_handler_v1,
3798 BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
3800 batadv_tvlv_handler_register(bat_priv, NULL,
3801 batadv_roam_tvlv_unicast_handler_v1,
3802 BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
3804 INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
3805 queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3806 msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3812 * batadv_tt_global_is_isolated - check if a client is marked as isolated
3813 * @bat_priv: the bat priv with all the soft interface information
3814 * @addr: the mac address of the client
3815 * @vid: the identifier of the VLAN where this client is connected
3817 * Return: true if the client is marked with the TT_CLIENT_ISOLA flag, false
3820 bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
3821 const u8 *addr, unsigned short vid)
3823 struct batadv_tt_global_entry *tt;
3826 tt = batadv_tt_global_hash_find(bat_priv, addr, vid);
3830 ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA;
3832 batadv_tt_global_entry_put(tt);