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 kfree_rcu(tt_local_entry, common.rcu);
222 * batadv_tt_local_entry_free_ref - decrement the tt_local_entry refcounter and
223 * possibly release it
224 * @tt_local_entry: tt_local_entry to be free'd
227 batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry)
229 kref_put(&tt_local_entry->common.refcount,
230 batadv_tt_local_entry_release);
234 * batadv_tt_global_entry_release - release tt_global_entry from lists and queue
235 * for free after rcu grace period
236 * @ref: kref pointer of the nc_node
238 static void batadv_tt_global_entry_release(struct kref *ref)
240 struct batadv_tt_global_entry *tt_global_entry;
242 tt_global_entry = container_of(ref, struct batadv_tt_global_entry,
245 batadv_tt_global_del_orig_list(tt_global_entry);
246 kfree_rcu(tt_global_entry, common.rcu);
250 * batadv_tt_global_entry_free_ref - decrement the tt_global_entry refcounter
251 * and possibly release it
252 * @tt_global_entry: tt_global_entry to be free'd
255 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry)
257 kref_put(&tt_global_entry->common.refcount,
258 batadv_tt_global_entry_release);
262 * batadv_tt_global_hash_count - count the number of orig entries
263 * @bat_priv: the bat priv with all the soft interface information
264 * @addr: the mac address of the client to count entries for
265 * @vid: VLAN identifier
267 * Return: the number of originators advertising the given address/data
268 * (excluding ourself).
270 int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
271 const u8 *addr, unsigned short vid)
273 struct batadv_tt_global_entry *tt_global_entry;
276 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
277 if (!tt_global_entry)
280 count = atomic_read(&tt_global_entry->orig_list_count);
281 batadv_tt_global_entry_free_ref(tt_global_entry);
287 * batadv_tt_local_size_mod - change the size by v of the local table identified
289 * @bat_priv: the bat priv with all the soft interface information
290 * @vid: the VLAN identifier of the sub-table to change
291 * @v: the amount to sum to the local table size
293 static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
294 unsigned short vid, int v)
296 struct batadv_softif_vlan *vlan;
298 vlan = batadv_softif_vlan_get(bat_priv, vid);
302 atomic_add(v, &vlan->tt.num_entries);
304 batadv_softif_vlan_free_ref(vlan);
308 * batadv_tt_local_size_inc - increase by one the local table size for the given
310 * @bat_priv: the bat priv with all the soft interface information
311 * @vid: the VLAN identifier
313 static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv,
316 batadv_tt_local_size_mod(bat_priv, vid, 1);
320 * batadv_tt_local_size_dec - decrease by one the local table size for the given
322 * @bat_priv: the bat priv with all the soft interface information
323 * @vid: the VLAN identifier
325 static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv,
328 batadv_tt_local_size_mod(bat_priv, vid, -1);
332 * batadv_tt_global_size_mod - change the size by v of the global table
333 * for orig_node identified by vid
334 * @orig_node: the originator for which the table has to be modified
335 * @vid: the VLAN identifier
336 * @v: the amount to sum to the global table size
338 static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node,
339 unsigned short vid, int v)
341 struct batadv_orig_node_vlan *vlan;
343 vlan = batadv_orig_node_vlan_new(orig_node, vid);
347 if (atomic_add_return(v, &vlan->tt.num_entries) == 0) {
348 spin_lock_bh(&orig_node->vlan_list_lock);
349 hlist_del_init_rcu(&vlan->list);
350 spin_unlock_bh(&orig_node->vlan_list_lock);
351 batadv_orig_node_vlan_free_ref(vlan);
354 batadv_orig_node_vlan_free_ref(vlan);
358 * batadv_tt_global_size_inc - increase by one the global table size for the
360 * @orig_node: the originator which global table size has to be decreased
361 * @vid: the vlan identifier
363 static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
366 batadv_tt_global_size_mod(orig_node, vid, 1);
370 * batadv_tt_global_size_dec - decrease by one the global table size for the
372 * @orig_node: the originator which global table size has to be decreased
373 * @vid: the vlan identifier
375 static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
378 batadv_tt_global_size_mod(orig_node, vid, -1);
382 * batadv_tt_orig_list_entry_release - release tt orig entry from lists and
383 * queue for free after rcu grace period
384 * @ref: kref pointer of the tt orig entry
386 static void batadv_tt_orig_list_entry_release(struct kref *ref)
388 struct batadv_tt_orig_list_entry *orig_entry;
390 orig_entry = container_of(ref, struct batadv_tt_orig_list_entry,
393 batadv_orig_node_free_ref(orig_entry->orig_node);
394 kfree_rcu(orig_entry, rcu);
398 * batadv_tt_orig_list_entry_free_ref - decrement the tt orig entry refcounter
399 * and possibly release it
400 * @orig_entry: tt orig entry to be free'd
403 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry)
405 kref_put(&orig_entry->refcount, batadv_tt_orig_list_entry_release);
409 * batadv_tt_local_event - store a local TT event (ADD/DEL)
410 * @bat_priv: the bat priv with all the soft interface information
411 * @tt_local_entry: the TT entry involved in the event
412 * @event_flags: flags to store in the event structure
414 static void batadv_tt_local_event(struct batadv_priv *bat_priv,
415 struct batadv_tt_local_entry *tt_local_entry,
418 struct batadv_tt_change_node *tt_change_node, *entry, *safe;
419 struct batadv_tt_common_entry *common = &tt_local_entry->common;
420 u8 flags = common->flags | event_flags;
421 bool event_removed = false;
422 bool del_op_requested, del_op_entry;
424 tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
428 tt_change_node->change.flags = flags;
429 memset(tt_change_node->change.reserved, 0,
430 sizeof(tt_change_node->change.reserved));
431 ether_addr_copy(tt_change_node->change.addr, common->addr);
432 tt_change_node->change.vid = htons(common->vid);
434 del_op_requested = flags & BATADV_TT_CLIENT_DEL;
436 /* check for ADD+DEL or DEL+ADD events */
437 spin_lock_bh(&bat_priv->tt.changes_list_lock);
438 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
440 if (!batadv_compare_eth(entry->change.addr, common->addr))
443 /* DEL+ADD in the same orig interval have no effect and can be
444 * removed to avoid silly behaviour on the receiver side. The
445 * other way around (ADD+DEL) can happen in case of roaming of
446 * a client still in the NEW state. Roaming of NEW clients is
447 * now possible due to automatically recognition of "temporary"
450 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
451 if (!del_op_requested && del_op_entry)
453 if (del_op_requested && !del_op_entry)
456 /* this is a second add in the same originator interval. It
457 * means that flags have been changed: update them!
459 if (!del_op_requested && !del_op_entry)
460 entry->change.flags = flags;
464 list_del(&entry->list);
466 kfree(tt_change_node);
467 event_removed = true;
471 /* track the change in the OGMinterval list */
472 list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
475 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
478 atomic_dec(&bat_priv->tt.local_changes);
480 atomic_inc(&bat_priv->tt.local_changes);
484 * batadv_tt_len - compute length in bytes of given number of tt changes
485 * @changes_num: number of tt changes
487 * Return: computed length in bytes.
489 static int batadv_tt_len(int changes_num)
491 return changes_num * sizeof(struct batadv_tvlv_tt_change);
495 * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
496 * @tt_len: available space
498 * Return: the number of entries.
500 static u16 batadv_tt_entries(u16 tt_len)
502 return tt_len / batadv_tt_len(1);
506 * batadv_tt_local_table_transmit_size - calculates the local translation table
507 * size when transmitted over the air
508 * @bat_priv: the bat priv with all the soft interface information
510 * Return: local translation table size in bytes.
512 static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
515 u16 tt_local_entries = 0;
516 struct batadv_softif_vlan *vlan;
520 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
522 tt_local_entries += atomic_read(&vlan->tt.num_entries);
526 /* header size of tvlv encapsulated tt response payload */
527 hdr_size = sizeof(struct batadv_unicast_tvlv_packet);
528 hdr_size += sizeof(struct batadv_tvlv_hdr);
529 hdr_size += sizeof(struct batadv_tvlv_tt_data);
530 hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data);
532 return hdr_size + batadv_tt_len(tt_local_entries);
535 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
537 if (bat_priv->tt.local_hash)
540 bat_priv->tt.local_hash = batadv_hash_new(1024);
542 if (!bat_priv->tt.local_hash)
545 batadv_hash_set_lock_class(bat_priv->tt.local_hash,
546 &batadv_tt_local_hash_lock_class_key);
551 static void batadv_tt_global_free(struct batadv_priv *bat_priv,
552 struct batadv_tt_global_entry *tt_global,
555 batadv_dbg(BATADV_DBG_TT, bat_priv,
556 "Deleting global tt entry %pM (vid: %d): %s\n",
557 tt_global->common.addr,
558 BATADV_PRINT_VID(tt_global->common.vid), message);
560 batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
561 batadv_choose_tt, &tt_global->common);
562 batadv_tt_global_entry_free_ref(tt_global);
566 * batadv_tt_local_add - add a new client to the local table or update an
568 * @soft_iface: netdev struct of the mesh interface
569 * @addr: the mac address of the client to add
570 * @vid: VLAN identifier
571 * @ifindex: index of the interface where the client is connected to (useful to
572 * identify wireless clients)
573 * @mark: the value contained in the skb->mark field of the received packet (if
576 * Return: true if the client was successfully added, false otherwise.
578 bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
579 unsigned short vid, int ifindex, u32 mark)
581 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
582 struct batadv_tt_local_entry *tt_local;
583 struct batadv_tt_global_entry *tt_global = NULL;
584 struct batadv_softif_vlan *vlan;
585 struct net_device *in_dev = NULL;
586 struct hlist_head *head;
587 struct batadv_tt_orig_list_entry *orig_entry;
588 int hash_added, table_size, packet_size_max;
590 bool roamed_back = false;
594 if (ifindex != BATADV_NULL_IFINDEX)
595 in_dev = dev_get_by_index(&init_net, ifindex);
597 tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
599 if (!is_multicast_ether_addr(addr))
600 tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
603 tt_local->last_seen = jiffies;
604 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
605 batadv_dbg(BATADV_DBG_TT, bat_priv,
606 "Re-adding pending client %pM (vid: %d)\n",
607 addr, BATADV_PRINT_VID(vid));
608 /* whatever the reason why the PENDING flag was set,
609 * this is a client which was enqueued to be removed in
610 * this orig_interval. Since it popped up again, the
611 * flag can be reset like it was never enqueued
613 tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
617 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
618 batadv_dbg(BATADV_DBG_TT, bat_priv,
619 "Roaming client %pM (vid: %d) came back to its original location\n",
620 addr, BATADV_PRINT_VID(vid));
621 /* the ROAM flag is set because this client roamed away
622 * and the node got a roaming_advertisement message. Now
623 * that the client popped up again at its original
624 * location such flag can be unset
626 tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
632 /* Ignore the client if we cannot send it in a full table response. */
633 table_size = batadv_tt_local_table_transmit_size(bat_priv);
634 table_size += batadv_tt_len(1);
635 packet_size_max = atomic_read(&bat_priv->packet_size_max);
636 if (table_size > packet_size_max) {
637 net_ratelimited_function(batadv_info, soft_iface,
638 "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
639 table_size, packet_size_max, addr);
643 tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC);
647 /* increase the refcounter of the related vlan */
648 vlan = batadv_softif_vlan_get(bat_priv, vid);
649 if (WARN(!vlan, "adding TT local entry %pM to non-existent VLAN %d",
650 addr, BATADV_PRINT_VID(vid))) {
656 batadv_dbg(BATADV_DBG_TT, bat_priv,
657 "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
658 addr, BATADV_PRINT_VID(vid),
659 (u8)atomic_read(&bat_priv->tt.vn));
661 ether_addr_copy(tt_local->common.addr, addr);
662 /* The local entry has to be marked as NEW to avoid to send it in
663 * a full table response going out before the next ttvn increment
664 * (consistency check)
666 tt_local->common.flags = BATADV_TT_CLIENT_NEW;
667 tt_local->common.vid = vid;
668 if (batadv_is_wifi_netdev(in_dev))
669 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
670 kref_init(&tt_local->common.refcount);
671 kref_get(&tt_local->common.refcount);
672 tt_local->last_seen = jiffies;
673 tt_local->common.added_at = tt_local->last_seen;
675 /* the batman interface mac and multicast addresses should never be
678 if (batadv_compare_eth(addr, soft_iface->dev_addr) ||
679 is_multicast_ether_addr(addr))
680 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
682 hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
683 batadv_choose_tt, &tt_local->common,
684 &tt_local->common.hash_entry);
686 if (unlikely(hash_added != 0)) {
687 /* remove the reference for the hash */
688 batadv_tt_local_entry_free_ref(tt_local);
689 batadv_softif_vlan_free_ref(vlan);
694 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
697 /* Check whether it is a roaming, but don't do anything if the roaming
698 * process has already been handled
700 if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
701 /* These node are probably going to update their tt table */
702 head = &tt_global->orig_list;
704 hlist_for_each_entry_rcu(orig_entry, head, list) {
705 batadv_send_roam_adv(bat_priv, tt_global->common.addr,
706 tt_global->common.vid,
707 orig_entry->orig_node);
711 batadv_tt_global_free(bat_priv, tt_global,
715 /* The global entry has to be marked as ROAMING and
716 * has to be kept for consistency purpose
718 tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
719 tt_global->roam_at = jiffies;
723 /* store the current remote flags before altering them. This helps
724 * understanding is flags are changing or not
726 remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK;
728 if (batadv_is_wifi_netdev(in_dev))
729 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
731 tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI;
733 /* check the mark in the skb: if it's equal to the configured
734 * isolation_mark, it means the packet is coming from an isolated
737 match_mark = (mark & bat_priv->isolation_mark_mask);
738 if (bat_priv->isolation_mark_mask &&
739 match_mark == bat_priv->isolation_mark)
740 tt_local->common.flags |= BATADV_TT_CLIENT_ISOLA;
742 tt_local->common.flags &= ~BATADV_TT_CLIENT_ISOLA;
744 /* if any "dynamic" flag has been modified, resend an ADD event for this
745 * entry so that all the nodes can get the new flags
747 if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
748 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
755 batadv_tt_local_entry_free_ref(tt_local);
757 batadv_tt_global_entry_free_ref(tt_global);
762 * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
763 * within a TT Response directed to another node
764 * @orig_node: originator for which the TT data has to be prepared
765 * @tt_data: uninitialised pointer to the address of the TVLV buffer
766 * @tt_change: uninitialised pointer to the address of the area where the TT
767 * changed can be stored
768 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
769 * function reserves the amount of space needed to send the entire global TT
770 * table. In case of success the value is updated with the real amount of
772 * Allocate the needed amount of memory for the entire TT TVLV and write its
773 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
774 * objects, one per active VLAN served by the originator node.
776 * Return: the size of the allocated buffer or 0 in case of failure.
779 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
780 struct batadv_tvlv_tt_data **tt_data,
781 struct batadv_tvlv_tt_change **tt_change,
788 struct batadv_tvlv_tt_vlan_data *tt_vlan;
789 struct batadv_orig_node_vlan *vlan;
793 hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
795 num_entries += atomic_read(&vlan->tt.num_entries);
798 change_offset = sizeof(**tt_data);
799 change_offset += num_vlan * sizeof(*tt_vlan);
801 /* if tt_len is negative, allocate the space needed by the full table */
803 *tt_len = batadv_tt_len(num_entries);
806 tvlv_len += change_offset;
808 *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
814 (*tt_data)->flags = BATADV_NO_FLAGS;
815 (*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
816 (*tt_data)->num_vlan = htons(num_vlan);
818 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
819 hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
820 tt_vlan->vid = htons(vlan->vid);
821 tt_vlan->crc = htonl(vlan->tt.crc);
826 tt_change_ptr = (u8 *)*tt_data + change_offset;
827 *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
835 * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
837 * @bat_priv: the bat priv with all the soft interface information
838 * @tt_data: uninitialised pointer to the address of the TVLV buffer
839 * @tt_change: uninitialised pointer to the address of the area where the TT
840 * changes can be stored
841 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
842 * function reserves the amount of space needed to send the entire local TT
843 * table. In case of success the value is updated with the real amount of
846 * Allocate the needed amount of memory for the entire TT TVLV and write its
847 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
848 * objects, one per active VLAN.
850 * Return: the size of the allocated buffer or 0 in case of failure.
853 batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
854 struct batadv_tvlv_tt_data **tt_data,
855 struct batadv_tvlv_tt_change **tt_change,
858 struct batadv_tvlv_tt_vlan_data *tt_vlan;
859 struct batadv_softif_vlan *vlan;
867 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
869 num_entries += atomic_read(&vlan->tt.num_entries);
872 change_offset = sizeof(**tt_data);
873 change_offset += num_vlan * sizeof(*tt_vlan);
875 /* if tt_len is negative, allocate the space needed by the full table */
877 *tt_len = batadv_tt_len(num_entries);
880 tvlv_len += change_offset;
882 *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
888 (*tt_data)->flags = BATADV_NO_FLAGS;
889 (*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
890 (*tt_data)->num_vlan = htons(num_vlan);
892 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
893 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
894 tt_vlan->vid = htons(vlan->vid);
895 tt_vlan->crc = htonl(vlan->tt.crc);
900 tt_change_ptr = (u8 *)*tt_data + change_offset;
901 *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
909 * batadv_tt_tvlv_container_update - update the translation table tvlv container
910 * after local tt changes have been committed
911 * @bat_priv: the bat priv with all the soft interface information
913 static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
915 struct batadv_tt_change_node *entry, *safe;
916 struct batadv_tvlv_tt_data *tt_data;
917 struct batadv_tvlv_tt_change *tt_change;
918 int tt_diff_len, tt_change_len = 0;
919 int tt_diff_entries_num = 0;
920 int tt_diff_entries_count = 0;
923 tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
924 tt_diff_len = batadv_tt_len(tt_diff_entries_num);
926 /* if we have too many changes for one packet don't send any
927 * and wait for the tt table request which will be fragmented
929 if (tt_diff_len > bat_priv->soft_iface->mtu)
932 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
933 &tt_change, &tt_diff_len);
937 tt_data->flags = BATADV_TT_OGM_DIFF;
939 if (tt_diff_len == 0)
940 goto container_register;
942 spin_lock_bh(&bat_priv->tt.changes_list_lock);
943 atomic_set(&bat_priv->tt.local_changes, 0);
945 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
947 if (tt_diff_entries_count < tt_diff_entries_num) {
948 memcpy(tt_change + tt_diff_entries_count,
950 sizeof(struct batadv_tvlv_tt_change));
951 tt_diff_entries_count++;
953 list_del(&entry->list);
956 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
958 /* Keep the buffer for possible tt_request */
959 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
960 kfree(bat_priv->tt.last_changeset);
961 bat_priv->tt.last_changeset_len = 0;
962 bat_priv->tt.last_changeset = NULL;
963 tt_change_len = batadv_tt_len(tt_diff_entries_count);
964 /* check whether this new OGM has no changes due to size problems */
965 if (tt_diff_entries_count > 0) {
966 /* if kmalloc() fails we will reply with the full table
967 * instead of providing the diff
969 bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
970 if (bat_priv->tt.last_changeset) {
971 memcpy(bat_priv->tt.last_changeset,
972 tt_change, tt_change_len);
973 bat_priv->tt.last_changeset_len = tt_diff_len;
976 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
979 batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
984 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
986 struct net_device *net_dev = (struct net_device *)seq->private;
987 struct batadv_priv *bat_priv = netdev_priv(net_dev);
988 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
989 struct batadv_tt_common_entry *tt_common_entry;
990 struct batadv_tt_local_entry *tt_local;
991 struct batadv_hard_iface *primary_if;
992 struct batadv_softif_vlan *vlan;
993 struct hlist_head *head;
998 unsigned long last_seen_jiffies;
1000 u16 np_flag = BATADV_TT_CLIENT_NOPURGE;
1002 primary_if = batadv_seq_print_text_primary_if_get(seq);
1007 "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
1008 net_dev->name, (u8)atomic_read(&bat_priv->tt.vn));
1009 seq_printf(seq, " %-13s %s %-8s %-9s (%-10s)\n", "Client", "VID",
1010 "Flags", "Last seen", "CRC");
1012 for (i = 0; i < hash->size; i++) {
1013 head = &hash->table[i];
1016 hlist_for_each_entry_rcu(tt_common_entry,
1018 tt_local = container_of(tt_common_entry,
1019 struct batadv_tt_local_entry,
1021 vid = tt_common_entry->vid;
1022 last_seen_jiffies = jiffies - tt_local->last_seen;
1023 last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
1024 last_seen_secs = last_seen_msecs / 1000;
1025 last_seen_msecs = last_seen_msecs % 1000;
1027 no_purge = tt_common_entry->flags & np_flag;
1029 vlan = batadv_softif_vlan_get(bat_priv, vid);
1031 seq_printf(seq, "Cannot retrieve VLAN %d\n",
1032 BATADV_PRINT_VID(vid));
1037 " * %pM %4i [%c%c%c%c%c%c] %3u.%03u (%#.8x)\n",
1038 tt_common_entry->addr,
1039 BATADV_PRINT_VID(tt_common_entry->vid),
1040 ((tt_common_entry->flags &
1041 BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1042 no_purge ? 'P' : '.',
1043 ((tt_common_entry->flags &
1044 BATADV_TT_CLIENT_NEW) ? 'N' : '.'),
1045 ((tt_common_entry->flags &
1046 BATADV_TT_CLIENT_PENDING) ? 'X' : '.'),
1047 ((tt_common_entry->flags &
1048 BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1049 ((tt_common_entry->flags &
1050 BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1051 no_purge ? 0 : last_seen_secs,
1052 no_purge ? 0 : last_seen_msecs,
1055 batadv_softif_vlan_free_ref(vlan);
1061 batadv_hardif_free_ref(primary_if);
1066 batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
1067 struct batadv_tt_local_entry *tt_local_entry,
1068 u16 flags, const char *message)
1070 batadv_tt_local_event(bat_priv, tt_local_entry, flags);
1072 /* The local client has to be marked as "pending to be removed" but has
1073 * to be kept in the table in order to send it in a full table
1074 * response issued before the net ttvn increment (consistency check)
1076 tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
1078 batadv_dbg(BATADV_DBG_TT, bat_priv,
1079 "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
1080 tt_local_entry->common.addr,
1081 BATADV_PRINT_VID(tt_local_entry->common.vid), message);
1085 * batadv_tt_local_remove - logically remove an entry from the local table
1086 * @bat_priv: the bat priv with all the soft interface information
1087 * @addr: the MAC address of the client to remove
1088 * @vid: VLAN identifier
1089 * @message: message to append to the log on deletion
1090 * @roaming: true if the deletion is due to a roaming event
1092 * Return: the flags assigned to the local entry before being deleted
1094 u16 batadv_tt_local_remove(struct batadv_priv *bat_priv, const u8 *addr,
1095 unsigned short vid, const char *message,
1098 struct batadv_tt_local_entry *tt_local_entry;
1099 u16 flags, curr_flags = BATADV_NO_FLAGS;
1100 struct batadv_softif_vlan *vlan;
1101 void *tt_entry_exists;
1103 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
1104 if (!tt_local_entry)
1107 curr_flags = tt_local_entry->common.flags;
1109 flags = BATADV_TT_CLIENT_DEL;
1110 /* if this global entry addition is due to a roaming, the node has to
1111 * mark the local entry as "roamed" in order to correctly reroute
1115 flags |= BATADV_TT_CLIENT_ROAM;
1116 /* mark the local client as ROAMed */
1117 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1120 if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
1121 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
1125 /* if this client has been added right now, it is possible to
1126 * immediately purge it
1128 batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL);
1130 tt_entry_exists = batadv_hash_remove(bat_priv->tt.local_hash,
1133 &tt_local_entry->common);
1134 if (!tt_entry_exists)
1137 /* extra call to free the local tt entry */
1138 batadv_tt_local_entry_free_ref(tt_local_entry);
1140 /* decrease the reference held for this vlan */
1141 vlan = batadv_softif_vlan_get(bat_priv, vid);
1145 batadv_softif_vlan_free_ref(vlan);
1146 batadv_softif_vlan_free_ref(vlan);
1150 batadv_tt_local_entry_free_ref(tt_local_entry);
1156 * batadv_tt_local_purge_list - purge inactive tt local entries
1157 * @bat_priv: the bat priv with all the soft interface information
1158 * @head: pointer to the list containing the local tt entries
1159 * @timeout: parameter deciding whether a given tt local entry is considered
1162 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
1163 struct hlist_head *head,
1166 struct batadv_tt_local_entry *tt_local_entry;
1167 struct batadv_tt_common_entry *tt_common_entry;
1168 struct hlist_node *node_tmp;
1170 hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
1172 tt_local_entry = container_of(tt_common_entry,
1173 struct batadv_tt_local_entry,
1175 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
1178 /* entry already marked for deletion */
1179 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
1182 if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout))
1185 batadv_tt_local_set_pending(bat_priv, tt_local_entry,
1186 BATADV_TT_CLIENT_DEL, "timed out");
1191 * batadv_tt_local_purge - purge inactive tt local entries
1192 * @bat_priv: the bat priv with all the soft interface information
1193 * @timeout: parameter deciding whether a given tt local entry is considered
1196 static void batadv_tt_local_purge(struct batadv_priv *bat_priv,
1199 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1200 struct hlist_head *head;
1201 spinlock_t *list_lock; /* protects write access to the hash lists */
1204 for (i = 0; i < hash->size; i++) {
1205 head = &hash->table[i];
1206 list_lock = &hash->list_locks[i];
1208 spin_lock_bh(list_lock);
1209 batadv_tt_local_purge_list(bat_priv, head, timeout);
1210 spin_unlock_bh(list_lock);
1214 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
1216 struct batadv_hashtable *hash;
1217 spinlock_t *list_lock; /* protects write access to the hash lists */
1218 struct batadv_tt_common_entry *tt_common_entry;
1219 struct batadv_tt_local_entry *tt_local;
1220 struct batadv_softif_vlan *vlan;
1221 struct hlist_node *node_tmp;
1222 struct hlist_head *head;
1225 if (!bat_priv->tt.local_hash)
1228 hash = bat_priv->tt.local_hash;
1230 for (i = 0; i < hash->size; i++) {
1231 head = &hash->table[i];
1232 list_lock = &hash->list_locks[i];
1234 spin_lock_bh(list_lock);
1235 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1237 hlist_del_rcu(&tt_common_entry->hash_entry);
1238 tt_local = container_of(tt_common_entry,
1239 struct batadv_tt_local_entry,
1242 /* decrease the reference held for this vlan */
1243 vlan = batadv_softif_vlan_get(bat_priv,
1244 tt_common_entry->vid);
1246 batadv_softif_vlan_free_ref(vlan);
1247 batadv_softif_vlan_free_ref(vlan);
1250 batadv_tt_local_entry_free_ref(tt_local);
1252 spin_unlock_bh(list_lock);
1255 batadv_hash_destroy(hash);
1257 bat_priv->tt.local_hash = NULL;
1260 static int batadv_tt_global_init(struct batadv_priv *bat_priv)
1262 if (bat_priv->tt.global_hash)
1265 bat_priv->tt.global_hash = batadv_hash_new(1024);
1267 if (!bat_priv->tt.global_hash)
1270 batadv_hash_set_lock_class(bat_priv->tt.global_hash,
1271 &batadv_tt_global_hash_lock_class_key);
1276 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
1278 struct batadv_tt_change_node *entry, *safe;
1280 spin_lock_bh(&bat_priv->tt.changes_list_lock);
1282 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1284 list_del(&entry->list);
1288 atomic_set(&bat_priv->tt.local_changes, 0);
1289 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1293 * batadv_tt_global_orig_entry_find - find a TT orig_list_entry
1294 * @entry: the TT global entry where the orig_list_entry has to be
1296 * @orig_node: the originator for which the orig_list_entry has to be found
1298 * retrieve the orig_tt_list_entry belonging to orig_node from the
1299 * batadv_tt_global_entry list
1301 * Return: it with an increased refcounter, NULL if not found
1303 static struct batadv_tt_orig_list_entry *
1304 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
1305 const struct batadv_orig_node *orig_node)
1307 struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
1308 const struct hlist_head *head;
1311 head = &entry->orig_list;
1312 hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
1313 if (tmp_orig_entry->orig_node != orig_node)
1315 if (!kref_get_unless_zero(&tmp_orig_entry->refcount))
1318 orig_entry = tmp_orig_entry;
1327 * batadv_tt_global_entry_has_orig - check if a TT global entry is also handled
1328 * by a given originator
1329 * @entry: the TT global entry to check
1330 * @orig_node: the originator to search in the list
1332 * find out if an orig_node is already in the list of a tt_global_entry.
1334 * Return: true if found, false otherwise
1337 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
1338 const struct batadv_orig_node *orig_node)
1340 struct batadv_tt_orig_list_entry *orig_entry;
1343 orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
1346 batadv_tt_orig_list_entry_free_ref(orig_entry);
1353 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
1354 struct batadv_orig_node *orig_node, int ttvn)
1356 struct batadv_tt_orig_list_entry *orig_entry;
1358 orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
1360 /* refresh the ttvn: the current value could be a bogus one that
1361 * was added during a "temporary client detection"
1363 orig_entry->ttvn = ttvn;
1367 orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
1371 INIT_HLIST_NODE(&orig_entry->list);
1372 kref_get(&orig_node->refcount);
1373 batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
1374 orig_entry->orig_node = orig_node;
1375 orig_entry->ttvn = ttvn;
1376 kref_init(&orig_entry->refcount);
1377 kref_get(&orig_entry->refcount);
1379 spin_lock_bh(&tt_global->list_lock);
1380 hlist_add_head_rcu(&orig_entry->list,
1381 &tt_global->orig_list);
1382 spin_unlock_bh(&tt_global->list_lock);
1383 atomic_inc(&tt_global->orig_list_count);
1387 batadv_tt_orig_list_entry_free_ref(orig_entry);
1391 * batadv_tt_global_add - add a new TT global entry or update an existing one
1392 * @bat_priv: the bat priv with all the soft interface information
1393 * @orig_node: the originator announcing the client
1394 * @tt_addr: the mac address of the non-mesh client
1395 * @vid: VLAN identifier
1396 * @flags: TT flags that have to be set for this non-mesh client
1397 * @ttvn: the tt version number ever announcing this non-mesh client
1399 * Add a new TT global entry for the given originator. If the entry already
1400 * exists add a new reference to the given originator (a global entry can have
1401 * references to multiple originators) and adjust the flags attribute to reflect
1402 * the function argument.
1403 * If a TT local entry exists for this non-mesh client remove it.
1405 * The caller must hold orig_node refcount.
1407 * Return: true if the new entry has been added, false otherwise
1409 static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
1410 struct batadv_orig_node *orig_node,
1411 const unsigned char *tt_addr,
1412 unsigned short vid, u16 flags, u8 ttvn)
1414 struct batadv_tt_global_entry *tt_global_entry;
1415 struct batadv_tt_local_entry *tt_local_entry;
1418 struct batadv_tt_common_entry *common;
1421 /* ignore global entries from backbone nodes */
1422 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
1425 tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
1426 tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
1428 /* if the node already has a local client for this entry, it has to wait
1429 * for a roaming advertisement instead of manually messing up the global
1432 if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
1433 !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
1436 if (!tt_global_entry) {
1437 tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
1438 if (!tt_global_entry)
1441 common = &tt_global_entry->common;
1442 ether_addr_copy(common->addr, tt_addr);
1445 common->flags = flags;
1446 tt_global_entry->roam_at = 0;
1447 /* node must store current time in case of roaming. This is
1448 * needed to purge this entry out on timeout (if nobody claims
1451 if (flags & BATADV_TT_CLIENT_ROAM)
1452 tt_global_entry->roam_at = jiffies;
1453 kref_init(&common->refcount);
1454 kref_get(&common->refcount);
1455 common->added_at = jiffies;
1457 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
1458 atomic_set(&tt_global_entry->orig_list_count, 0);
1459 spin_lock_init(&tt_global_entry->list_lock);
1461 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
1463 batadv_choose_tt, common,
1464 &common->hash_entry);
1466 if (unlikely(hash_added != 0)) {
1467 /* remove the reference for the hash */
1468 batadv_tt_global_entry_free_ref(tt_global_entry);
1472 common = &tt_global_entry->common;
1473 /* If there is already a global entry, we can use this one for
1475 * But if we are trying to add a temporary client then here are
1476 * two options at this point:
1477 * 1) the global client is not a temporary client: the global
1478 * client has to be left as it is, temporary information
1479 * should never override any already known client state
1480 * 2) the global client is a temporary client: purge the
1481 * originator list and add the new one orig_entry
1483 if (flags & BATADV_TT_CLIENT_TEMP) {
1484 if (!(common->flags & BATADV_TT_CLIENT_TEMP))
1486 if (batadv_tt_global_entry_has_orig(tt_global_entry,
1489 batadv_tt_global_del_orig_list(tt_global_entry);
1490 goto add_orig_entry;
1493 /* if the client was temporary added before receiving the first
1494 * OGM announcing it, we have to clear the TEMP flag. Also,
1495 * remove the previous temporary orig node and re-add it
1496 * if required. If the orig entry changed, the new one which
1497 * is a non-temporary entry is preferred.
1499 if (common->flags & BATADV_TT_CLIENT_TEMP) {
1500 batadv_tt_global_del_orig_list(tt_global_entry);
1501 common->flags &= ~BATADV_TT_CLIENT_TEMP;
1504 /* the change can carry possible "attribute" flags like the
1505 * TT_CLIENT_WIFI, therefore they have to be copied in the
1508 common->flags |= flags;
1510 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1511 * one originator left in the list and we previously received a
1512 * delete + roaming change for this originator.
1514 * We should first delete the old originator before adding the
1517 if (common->flags & BATADV_TT_CLIENT_ROAM) {
1518 batadv_tt_global_del_orig_list(tt_global_entry);
1519 common->flags &= ~BATADV_TT_CLIENT_ROAM;
1520 tt_global_entry->roam_at = 0;
1524 /* add the new orig_entry (if needed) or update it */
1525 batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);
1527 batadv_dbg(BATADV_DBG_TT, bat_priv,
1528 "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1529 common->addr, BATADV_PRINT_VID(common->vid),
1534 /* Do not remove multicast addresses from the local hash on
1537 if (is_multicast_ether_addr(tt_addr))
1540 /* remove address from local hash if present */
1541 local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
1542 "global tt received",
1543 flags & BATADV_TT_CLIENT_ROAM);
1544 tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
1546 if (!(flags & BATADV_TT_CLIENT_ROAM))
1547 /* this is a normal global add. Therefore the client is not in a
1548 * roaming state anymore.
1550 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
1553 if (tt_global_entry)
1554 batadv_tt_global_entry_free_ref(tt_global_entry);
1556 batadv_tt_local_entry_free_ref(tt_local_entry);
1561 * batadv_transtable_best_orig - Get best originator list entry from tt entry
1562 * @bat_priv: the bat priv with all the soft interface information
1563 * @tt_global_entry: global translation table entry to be analyzed
1565 * This functon assumes the caller holds rcu_read_lock().
1566 * Return: best originator list entry or NULL on errors.
1568 static struct batadv_tt_orig_list_entry *
1569 batadv_transtable_best_orig(struct batadv_priv *bat_priv,
1570 struct batadv_tt_global_entry *tt_global_entry)
1572 struct batadv_neigh_node *router, *best_router = NULL;
1573 struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1574 struct hlist_head *head;
1575 struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
1577 head = &tt_global_entry->orig_list;
1578 hlist_for_each_entry_rcu(orig_entry, head, list) {
1579 router = batadv_orig_router_get(orig_entry->orig_node,
1585 bao->bat_neigh_cmp(router, BATADV_IF_DEFAULT,
1586 best_router, BATADV_IF_DEFAULT) <= 0) {
1587 batadv_neigh_node_free_ref(router);
1591 /* release the refcount for the "old" best */
1593 batadv_neigh_node_free_ref(best_router);
1595 best_entry = orig_entry;
1596 best_router = router;
1600 batadv_neigh_node_free_ref(best_router);
1606 * batadv_tt_global_print_entry - print all orig nodes who announce the address
1607 * for this global entry
1608 * @bat_priv: the bat priv with all the soft interface information
1609 * @tt_global_entry: global translation table entry to be printed
1610 * @seq: debugfs table seq_file struct
1612 * This functon assumes the caller holds rcu_read_lock().
1615 batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
1616 struct batadv_tt_global_entry *tt_global_entry,
1617 struct seq_file *seq)
1619 struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
1620 struct batadv_tt_common_entry *tt_common_entry;
1621 struct batadv_orig_node_vlan *vlan;
1622 struct hlist_head *head;
1626 tt_common_entry = &tt_global_entry->common;
1627 flags = tt_common_entry->flags;
1629 best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1631 vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
1632 tt_common_entry->vid);
1635 " * Cannot retrieve VLAN %d for originator %pM\n",
1636 BATADV_PRINT_VID(tt_common_entry->vid),
1637 best_entry->orig_node->orig);
1641 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
1643 " %c %pM %4i (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
1644 '*', tt_global_entry->common.addr,
1645 BATADV_PRINT_VID(tt_global_entry->common.vid),
1646 best_entry->ttvn, best_entry->orig_node->orig,
1647 last_ttvn, vlan->tt.crc,
1648 ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1649 ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1650 ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1651 ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1653 batadv_orig_node_vlan_free_ref(vlan);
1657 head = &tt_global_entry->orig_list;
1659 hlist_for_each_entry_rcu(orig_entry, head, list) {
1660 if (best_entry == orig_entry)
1663 vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
1664 tt_common_entry->vid);
1667 " + Cannot retrieve VLAN %d for originator %pM\n",
1668 BATADV_PRINT_VID(tt_common_entry->vid),
1669 orig_entry->orig_node->orig);
1673 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
1675 " %c %pM %4d (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
1676 '+', tt_global_entry->common.addr,
1677 BATADV_PRINT_VID(tt_global_entry->common.vid),
1678 orig_entry->ttvn, orig_entry->orig_node->orig,
1679 last_ttvn, vlan->tt.crc,
1680 ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1681 ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1682 ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1683 ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1685 batadv_orig_node_vlan_free_ref(vlan);
1689 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
1691 struct net_device *net_dev = (struct net_device *)seq->private;
1692 struct batadv_priv *bat_priv = netdev_priv(net_dev);
1693 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1694 struct batadv_tt_common_entry *tt_common_entry;
1695 struct batadv_tt_global_entry *tt_global;
1696 struct batadv_hard_iface *primary_if;
1697 struct hlist_head *head;
1700 primary_if = batadv_seq_print_text_primary_if_get(seq);
1705 "Globally announced TT entries received via the mesh %s\n",
1707 seq_printf(seq, " %-13s %s %s %-15s %s (%-10s) %s\n",
1708 "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1711 for (i = 0; i < hash->size; i++) {
1712 head = &hash->table[i];
1715 hlist_for_each_entry_rcu(tt_common_entry,
1717 tt_global = container_of(tt_common_entry,
1718 struct batadv_tt_global_entry,
1720 batadv_tt_global_print_entry(bat_priv, tt_global, seq);
1726 batadv_hardif_free_ref(primary_if);
1731 * _batadv_tt_global_del_orig_entry - remove and free an orig_entry
1732 * @tt_global_entry: the global entry to remove the orig_entry from
1733 * @orig_entry: the orig entry to remove and free
1735 * Remove an orig_entry from its list in the given tt_global_entry and
1736 * free this orig_entry afterwards.
1738 * Caller must hold tt_global_entry->list_lock and ensure orig_entry->list is
1742 _batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
1743 struct batadv_tt_orig_list_entry *orig_entry)
1745 lockdep_assert_held(&tt_global_entry->list_lock);
1747 batadv_tt_global_size_dec(orig_entry->orig_node,
1748 tt_global_entry->common.vid);
1749 atomic_dec(&tt_global_entry->orig_list_count);
1750 /* requires holding tt_global_entry->list_lock and orig_entry->list
1751 * being part of a list
1753 hlist_del_rcu(&orig_entry->list);
1754 batadv_tt_orig_list_entry_free_ref(orig_entry);
1757 /* deletes the orig list of a tt_global_entry */
1759 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
1761 struct hlist_head *head;
1762 struct hlist_node *safe;
1763 struct batadv_tt_orig_list_entry *orig_entry;
1765 spin_lock_bh(&tt_global_entry->list_lock);
1766 head = &tt_global_entry->orig_list;
1767 hlist_for_each_entry_safe(orig_entry, safe, head, list)
1768 _batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
1769 spin_unlock_bh(&tt_global_entry->list_lock);
1773 * batadv_tt_global_del_orig_node - remove orig_node from a global tt entry
1774 * @bat_priv: the bat priv with all the soft interface information
1775 * @tt_global_entry: the global entry to remove the orig_node from
1776 * @orig_node: the originator announcing the client
1777 * @message: message to append to the log on deletion
1779 * Remove the given orig_node and its according orig_entry from the given
1783 batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
1784 struct batadv_tt_global_entry *tt_global_entry,
1785 struct batadv_orig_node *orig_node,
1786 const char *message)
1788 struct hlist_head *head;
1789 struct hlist_node *safe;
1790 struct batadv_tt_orig_list_entry *orig_entry;
1793 spin_lock_bh(&tt_global_entry->list_lock);
1794 head = &tt_global_entry->orig_list;
1795 hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1796 if (orig_entry->orig_node == orig_node) {
1797 vid = tt_global_entry->common.vid;
1798 batadv_dbg(BATADV_DBG_TT, bat_priv,
1799 "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1801 tt_global_entry->common.addr,
1802 BATADV_PRINT_VID(vid), message);
1803 _batadv_tt_global_del_orig_entry(tt_global_entry,
1807 spin_unlock_bh(&tt_global_entry->list_lock);
1810 /* If the client is to be deleted, we check if it is the last origantor entry
1811 * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1812 * timer, otherwise we simply remove the originator scheduled for deletion.
1815 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
1816 struct batadv_tt_global_entry *tt_global_entry,
1817 struct batadv_orig_node *orig_node,
1818 const char *message)
1820 bool last_entry = true;
1821 struct hlist_head *head;
1822 struct batadv_tt_orig_list_entry *orig_entry;
1824 /* no local entry exists, case 1:
1825 * Check if this is the last one or if other entries exist.
1829 head = &tt_global_entry->orig_list;
1830 hlist_for_each_entry_rcu(orig_entry, head, list) {
1831 if (orig_entry->orig_node != orig_node) {
1839 /* its the last one, mark for roaming. */
1840 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1841 tt_global_entry->roam_at = jiffies;
1843 /* there is another entry, we can simply delete this
1844 * one and can still use the other one.
1846 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
1847 orig_node, message);
1851 * batadv_tt_global_del - remove a client from the global table
1852 * @bat_priv: the bat priv with all the soft interface information
1853 * @orig_node: an originator serving this client
1854 * @addr: the mac address of the client
1855 * @vid: VLAN identifier
1856 * @message: a message explaining the reason for deleting the client to print
1857 * for debugging purpose
1858 * @roaming: true if the deletion has been triggered by a roaming event
1860 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
1861 struct batadv_orig_node *orig_node,
1862 const unsigned char *addr, unsigned short vid,
1863 const char *message, bool roaming)
1865 struct batadv_tt_global_entry *tt_global_entry;
1866 struct batadv_tt_local_entry *local_entry = NULL;
1868 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1869 if (!tt_global_entry)
1873 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
1874 orig_node, message);
1876 if (hlist_empty(&tt_global_entry->orig_list))
1877 batadv_tt_global_free(bat_priv, tt_global_entry,
1883 /* if we are deleting a global entry due to a roam
1884 * event, there are two possibilities:
1885 * 1) the client roamed from node A to node B => if there
1886 * is only one originator left for this client, we mark
1887 * it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1888 * wait for node B to claim it. In case of timeout
1889 * the entry is purged.
1891 * If there are other originators left, we directly delete
1893 * 2) the client roamed to us => we can directly delete
1894 * the global entry, since it is useless now.
1896 local_entry = batadv_tt_local_hash_find(bat_priv,
1897 tt_global_entry->common.addr,
1900 /* local entry exists, case 2: client roamed to us. */
1901 batadv_tt_global_del_orig_list(tt_global_entry);
1902 batadv_tt_global_free(bat_priv, tt_global_entry, message);
1904 /* no local entry exists, case 1: check for roaming */
1905 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
1906 orig_node, message);
1909 if (tt_global_entry)
1910 batadv_tt_global_entry_free_ref(tt_global_entry);
1912 batadv_tt_local_entry_free_ref(local_entry);
1916 * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1917 * given originator matching the provided vid
1918 * @bat_priv: the bat priv with all the soft interface information
1919 * @orig_node: the originator owning the entries to remove
1920 * @match_vid: the VLAN identifier to match. If negative all the entries will be
1922 * @message: debug message to print as "reason"
1924 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
1925 struct batadv_orig_node *orig_node,
1927 const char *message)
1929 struct batadv_tt_global_entry *tt_global;
1930 struct batadv_tt_common_entry *tt_common_entry;
1932 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1933 struct hlist_node *safe;
1934 struct hlist_head *head;
1935 spinlock_t *list_lock; /* protects write access to the hash lists */
1941 for (i = 0; i < hash->size; i++) {
1942 head = &hash->table[i];
1943 list_lock = &hash->list_locks[i];
1945 spin_lock_bh(list_lock);
1946 hlist_for_each_entry_safe(tt_common_entry, safe,
1948 /* remove only matching entries */
1949 if (match_vid >= 0 && tt_common_entry->vid != match_vid)
1952 tt_global = container_of(tt_common_entry,
1953 struct batadv_tt_global_entry,
1956 batadv_tt_global_del_orig_node(bat_priv, tt_global,
1957 orig_node, message);
1959 if (hlist_empty(&tt_global->orig_list)) {
1960 vid = tt_global->common.vid;
1961 batadv_dbg(BATADV_DBG_TT, bat_priv,
1962 "Deleting global tt entry %pM (vid: %d): %s\n",
1963 tt_global->common.addr,
1964 BATADV_PRINT_VID(vid), message);
1965 hlist_del_rcu(&tt_common_entry->hash_entry);
1966 batadv_tt_global_entry_free_ref(tt_global);
1969 spin_unlock_bh(list_lock);
1971 clear_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
1974 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
1978 unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
1979 unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
1981 if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
1982 batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
1984 *msg = "Roaming timeout\n";
1987 if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
1988 batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
1990 *msg = "Temporary client timeout\n";
1996 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
1998 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1999 struct hlist_head *head;
2000 struct hlist_node *node_tmp;
2001 spinlock_t *list_lock; /* protects write access to the hash lists */
2004 struct batadv_tt_common_entry *tt_common;
2005 struct batadv_tt_global_entry *tt_global;
2007 for (i = 0; i < hash->size; i++) {
2008 head = &hash->table[i];
2009 list_lock = &hash->list_locks[i];
2011 spin_lock_bh(list_lock);
2012 hlist_for_each_entry_safe(tt_common, node_tmp, head,
2014 tt_global = container_of(tt_common,
2015 struct batadv_tt_global_entry,
2018 if (!batadv_tt_global_to_purge(tt_global, &msg))
2021 batadv_dbg(BATADV_DBG_TT, bat_priv,
2022 "Deleting global tt entry %pM (vid: %d): %s\n",
2023 tt_global->common.addr,
2024 BATADV_PRINT_VID(tt_global->common.vid),
2027 hlist_del_rcu(&tt_common->hash_entry);
2029 batadv_tt_global_entry_free_ref(tt_global);
2031 spin_unlock_bh(list_lock);
2035 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
2037 struct batadv_hashtable *hash;
2038 spinlock_t *list_lock; /* protects write access to the hash lists */
2039 struct batadv_tt_common_entry *tt_common_entry;
2040 struct batadv_tt_global_entry *tt_global;
2041 struct hlist_node *node_tmp;
2042 struct hlist_head *head;
2045 if (!bat_priv->tt.global_hash)
2048 hash = bat_priv->tt.global_hash;
2050 for (i = 0; i < hash->size; i++) {
2051 head = &hash->table[i];
2052 list_lock = &hash->list_locks[i];
2054 spin_lock_bh(list_lock);
2055 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
2057 hlist_del_rcu(&tt_common_entry->hash_entry);
2058 tt_global = container_of(tt_common_entry,
2059 struct batadv_tt_global_entry,
2061 batadv_tt_global_entry_free_ref(tt_global);
2063 spin_unlock_bh(list_lock);
2066 batadv_hash_destroy(hash);
2068 bat_priv->tt.global_hash = NULL;
2072 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
2073 struct batadv_tt_global_entry *tt_global_entry)
2077 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
2078 tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
2081 /* check if the two clients are marked as isolated */
2082 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
2083 tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
2090 * batadv_transtable_search - get the mesh destination for a given client
2091 * @bat_priv: the bat priv with all the soft interface information
2092 * @src: mac address of the source client
2093 * @addr: mac address of the destination client
2094 * @vid: VLAN identifier
2096 * Return: a pointer to the originator that was selected as destination in the
2097 * mesh for contacting the client 'addr', NULL otherwise.
2098 * In case of multiple originators serving the same client, the function returns
2099 * the best one (best in terms of metric towards the destination node).
2101 * If the two clients are AP isolated the function returns NULL.
2103 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
2108 struct batadv_tt_local_entry *tt_local_entry = NULL;
2109 struct batadv_tt_global_entry *tt_global_entry = NULL;
2110 struct batadv_orig_node *orig_node = NULL;
2111 struct batadv_tt_orig_list_entry *best_entry;
2113 if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) {
2114 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
2115 if (!tt_local_entry ||
2116 (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
2120 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
2121 if (!tt_global_entry)
2124 /* check whether the clients should not communicate due to AP
2127 if (tt_local_entry &&
2128 _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
2132 best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
2133 /* found anything? */
2135 orig_node = best_entry->orig_node;
2136 if (orig_node && !kref_get_unless_zero(&orig_node->refcount))
2141 if (tt_global_entry)
2142 batadv_tt_global_entry_free_ref(tt_global_entry);
2144 batadv_tt_local_entry_free_ref(tt_local_entry);
2150 * batadv_tt_global_crc - calculates the checksum of the local table belonging
2151 * to the given orig_node
2152 * @bat_priv: the bat priv with all the soft interface information
2153 * @orig_node: originator for which the CRC should be computed
2154 * @vid: VLAN identifier for which the CRC32 has to be computed
2156 * This function computes the checksum for the global table corresponding to a
2157 * specific originator. In particular, the checksum is computed as follows: For
2158 * each client connected to the originator the CRC32C of the MAC address and the
2159 * VID is computed and then all the CRC32Cs of the various clients are xor'ed
2162 * The idea behind is that CRC32C should be used as much as possible in order to
2163 * produce a unique hash of the table, but since the order which is used to feed
2164 * the CRC32C function affects the result and since every node in the network
2165 * probably sorts the clients differently, the hash function cannot be directly
2166 * computed over the entire table. Hence the CRC32C is used only on
2167 * the single client entry, while all the results are then xor'ed together
2168 * because the XOR operation can combine them all while trying to reduce the
2169 * noise as much as possible.
2171 * Return: the checksum of the global table of a given originator.
2173 static u32 batadv_tt_global_crc(struct batadv_priv *bat_priv,
2174 struct batadv_orig_node *orig_node,
2177 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2178 struct batadv_tt_common_entry *tt_common;
2179 struct batadv_tt_global_entry *tt_global;
2180 struct hlist_head *head;
2181 u32 i, crc_tmp, crc = 0;
2185 for (i = 0; i < hash->size; i++) {
2186 head = &hash->table[i];
2189 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2190 tt_global = container_of(tt_common,
2191 struct batadv_tt_global_entry,
2193 /* compute the CRC only for entries belonging to the
2194 * VLAN identified by the vid passed as parameter
2196 if (tt_common->vid != vid)
2199 /* Roaming clients are in the global table for
2200 * consistency only. They don't have to be
2201 * taken into account while computing the
2204 if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
2206 /* Temporary clients have not been announced yet, so
2207 * they have to be skipped while computing the global
2210 if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
2213 /* find out if this global entry is announced by this
2216 if (!batadv_tt_global_entry_has_orig(tt_global,
2220 /* use network order to read the VID: this ensures that
2221 * every node reads the bytes in the same order.
2223 tmp_vid = htons(tt_common->vid);
2224 crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2226 /* compute the CRC on flags that have to be kept in sync
2229 flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2230 crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2232 crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2241 * batadv_tt_local_crc - calculates the checksum of the local table
2242 * @bat_priv: the bat priv with all the soft interface information
2243 * @vid: VLAN identifier for which the CRC32 has to be computed
2245 * For details about the computation, please refer to the documentation for
2246 * batadv_tt_global_crc().
2248 * Return: the checksum of the local table
2250 static u32 batadv_tt_local_crc(struct batadv_priv *bat_priv,
2253 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2254 struct batadv_tt_common_entry *tt_common;
2255 struct hlist_head *head;
2256 u32 i, crc_tmp, crc = 0;
2260 for (i = 0; i < hash->size; i++) {
2261 head = &hash->table[i];
2264 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2265 /* compute the CRC only for entries belonging to the
2266 * VLAN identified by vid
2268 if (tt_common->vid != vid)
2271 /* not yet committed clients have not to be taken into
2272 * account while computing the CRC
2274 if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2277 /* use network order to read the VID: this ensures that
2278 * every node reads the bytes in the same order.
2280 tmp_vid = htons(tt_common->vid);
2281 crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2283 /* compute the CRC on flags that have to be kept in sync
2286 flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2287 crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2289 crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2297 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2299 struct batadv_tt_req_node *node;
2300 struct hlist_node *safe;
2302 spin_lock_bh(&bat_priv->tt.req_list_lock);
2304 hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2305 hlist_del_init(&node->list);
2309 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2312 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2313 struct batadv_orig_node *orig_node,
2314 const void *tt_buff,
2317 /* Replace the old buffer only if I received something in the
2318 * last OGM (the OGM could carry no changes)
2320 spin_lock_bh(&orig_node->tt_buff_lock);
2321 if (tt_buff_len > 0) {
2322 kfree(orig_node->tt_buff);
2323 orig_node->tt_buff_len = 0;
2324 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2325 if (orig_node->tt_buff) {
2326 memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2327 orig_node->tt_buff_len = tt_buff_len;
2330 spin_unlock_bh(&orig_node->tt_buff_lock);
2333 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2335 struct batadv_tt_req_node *node;
2336 struct hlist_node *safe;
2338 spin_lock_bh(&bat_priv->tt.req_list_lock);
2339 hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2340 if (batadv_has_timed_out(node->issued_at,
2341 BATADV_TT_REQUEST_TIMEOUT)) {
2342 hlist_del_init(&node->list);
2346 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2350 * batadv_tt_req_node_new - search and possibly create a tt_req_node object
2351 * @bat_priv: the bat priv with all the soft interface information
2352 * @orig_node: orig node this request is being issued for
2354 * Return: the pointer to the new tt_req_node struct if no request
2355 * has already been issued for this orig_node, NULL otherwise.
2357 static struct batadv_tt_req_node *
2358 batadv_tt_req_node_new(struct batadv_priv *bat_priv,
2359 struct batadv_orig_node *orig_node)
2361 struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2363 spin_lock_bh(&bat_priv->tt.req_list_lock);
2364 hlist_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2365 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2366 !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2367 BATADV_TT_REQUEST_TIMEOUT))
2371 tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
2375 ether_addr_copy(tt_req_node->addr, orig_node->orig);
2376 tt_req_node->issued_at = jiffies;
2378 hlist_add_head(&tt_req_node->list, &bat_priv->tt.req_list);
2380 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2385 * batadv_tt_local_valid - verify that given tt entry is a valid one
2386 * @entry_ptr: to be checked local tt entry
2387 * @data_ptr: not used but definition required to satisfy the callback prototype
2389 * Return: 1 if the entry is a valid, 0 otherwise.
2391 static int batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
2393 const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2395 if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2400 static int batadv_tt_global_valid(const void *entry_ptr,
2401 const void *data_ptr)
2403 const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2404 const struct batadv_tt_global_entry *tt_global_entry;
2405 const struct batadv_orig_node *orig_node = data_ptr;
2407 if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2408 tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2411 tt_global_entry = container_of(tt_common_entry,
2412 struct batadv_tt_global_entry,
2415 return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
2419 * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2421 * @bat_priv: the bat priv with all the soft interface information
2422 * @hash: hash table containing the tt entries
2423 * @tt_len: expected tvlv tt data buffer length in number of bytes
2424 * @tvlv_buff: pointer to the buffer to fill with the TT data
2425 * @valid_cb: function to filter tt change entries
2426 * @cb_data: data passed to the filter function as argument
2428 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2429 struct batadv_hashtable *hash,
2430 void *tvlv_buff, u16 tt_len,
2431 int (*valid_cb)(const void *, const void *),
2434 struct batadv_tt_common_entry *tt_common_entry;
2435 struct batadv_tvlv_tt_change *tt_change;
2436 struct hlist_head *head;
2437 u16 tt_tot, tt_num_entries = 0;
2440 tt_tot = batadv_tt_entries(tt_len);
2441 tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
2444 for (i = 0; i < hash->size; i++) {
2445 head = &hash->table[i];
2447 hlist_for_each_entry_rcu(tt_common_entry,
2449 if (tt_tot == tt_num_entries)
2452 if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
2455 ether_addr_copy(tt_change->addr, tt_common_entry->addr);
2456 tt_change->flags = tt_common_entry->flags;
2457 tt_change->vid = htons(tt_common_entry->vid);
2458 memset(tt_change->reserved, 0,
2459 sizeof(tt_change->reserved));
2469 * batadv_tt_global_check_crc - check if all the CRCs are correct
2470 * @orig_node: originator for which the CRCs have to be checked
2471 * @tt_vlan: pointer to the first tvlv VLAN entry
2472 * @num_vlan: number of tvlv VLAN entries
2474 * Return: true if all the received CRCs match the locally stored ones, false
2477 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
2478 struct batadv_tvlv_tt_vlan_data *tt_vlan,
2481 struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
2482 struct batadv_orig_node_vlan *vlan;
2483 int i, orig_num_vlan;
2486 /* check if each received CRC matches the locally stored one */
2487 for (i = 0; i < num_vlan; i++) {
2488 tt_vlan_tmp = tt_vlan + i;
2490 /* if orig_node is a backbone node for this VLAN, don't check
2491 * the CRC as we ignore all the global entries over it
2493 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
2495 ntohs(tt_vlan_tmp->vid)))
2498 vlan = batadv_orig_node_vlan_get(orig_node,
2499 ntohs(tt_vlan_tmp->vid));
2504 batadv_orig_node_vlan_free_ref(vlan);
2506 if (crc != ntohl(tt_vlan_tmp->crc))
2510 /* check if any excess VLANs exist locally for the originator
2511 * which are not mentioned in the TVLV from the originator.
2515 hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list)
2519 if (orig_num_vlan > num_vlan)
2526 * batadv_tt_local_update_crc - update all the local CRCs
2527 * @bat_priv: the bat priv with all the soft interface information
2529 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
2531 struct batadv_softif_vlan *vlan;
2533 /* recompute the global CRC for each VLAN */
2535 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
2536 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
2542 * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2543 * @bat_priv: the bat priv with all the soft interface information
2544 * @orig_node: the orig_node for which the CRCs have to be updated
2546 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
2547 struct batadv_orig_node *orig_node)
2549 struct batadv_orig_node_vlan *vlan;
2552 /* recompute the global CRC for each VLAN */
2554 hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
2555 /* if orig_node is a backbone node for this VLAN, don't compute
2556 * the CRC as we ignore all the global entries over it
2558 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
2562 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
2569 * batadv_send_tt_request - send a TT Request message to a given node
2570 * @bat_priv: the bat priv with all the soft interface information
2571 * @dst_orig_node: the destination of the message
2572 * @ttvn: the version number that the source of the message is looking for
2573 * @tt_vlan: pointer to the first tvlv VLAN object to request
2574 * @num_vlan: number of tvlv VLAN entries
2575 * @full_table: ask for the entire translation table if true, while only for the
2576 * last TT diff otherwise
2578 * Return: true if the TT Request was sent, false otherwise
2580 static int batadv_send_tt_request(struct batadv_priv *bat_priv,
2581 struct batadv_orig_node *dst_orig_node,
2583 struct batadv_tvlv_tt_vlan_data *tt_vlan,
2584 u16 num_vlan, bool full_table)
2586 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2587 struct batadv_tt_req_node *tt_req_node = NULL;
2588 struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
2589 struct batadv_hard_iface *primary_if;
2593 primary_if = batadv_primary_if_get_selected(bat_priv);
2597 /* The new tt_req will be issued only if I'm not waiting for a
2598 * reply from the same orig_node yet
2600 tt_req_node = batadv_tt_req_node_new(bat_priv, dst_orig_node);
2604 size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
2605 tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
2609 tvlv_tt_data->flags = BATADV_TT_REQUEST;
2610 tvlv_tt_data->ttvn = ttvn;
2611 tvlv_tt_data->num_vlan = htons(num_vlan);
2613 /* send all the CRCs within the request. This is needed by intermediate
2614 * nodes to ensure they have the correct table before replying
2616 tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
2617 for (i = 0; i < num_vlan; i++) {
2618 tt_vlan_req->vid = tt_vlan->vid;
2619 tt_vlan_req->crc = tt_vlan->crc;
2626 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2628 batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
2629 dst_orig_node->orig, full_table ? 'F' : '.');
2631 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
2632 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2633 dst_orig_node->orig, BATADV_TVLV_TT, 1,
2634 tvlv_tt_data, size);
2639 batadv_hardif_free_ref(primary_if);
2640 if (ret && tt_req_node) {
2641 spin_lock_bh(&bat_priv->tt.req_list_lock);
2642 /* hlist_del_init() verifies tt_req_node still is in the list */
2643 hlist_del_init(&tt_req_node->list);
2644 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2647 kfree(tvlv_tt_data);
2652 * batadv_send_other_tt_response - send reply to tt request concerning another
2653 * node's translation table
2654 * @bat_priv: the bat priv with all the soft interface information
2655 * @tt_data: tt data containing the tt request information
2656 * @req_src: mac address of tt request sender
2657 * @req_dst: mac address of tt request recipient
2659 * Return: true if tt request reply was sent, false otherwise.
2661 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
2662 struct batadv_tvlv_tt_data *tt_data,
2663 u8 *req_src, u8 *req_dst)
2665 struct batadv_orig_node *req_dst_orig_node;
2666 struct batadv_orig_node *res_dst_orig_node = NULL;
2667 struct batadv_tvlv_tt_change *tt_change;
2668 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2669 struct batadv_tvlv_tt_vlan_data *tt_vlan;
2670 bool ret = false, full_table;
2671 u8 orig_ttvn, req_ttvn;
2675 batadv_dbg(BATADV_DBG_TT, bat_priv,
2676 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2677 req_src, tt_data->ttvn, req_dst,
2678 ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2680 /* Let's get the orig node of the REAL destination */
2681 req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
2682 if (!req_dst_orig_node)
2685 res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
2686 if (!res_dst_orig_node)
2689 orig_ttvn = (u8)atomic_read(&req_dst_orig_node->last_ttvn);
2690 req_ttvn = tt_data->ttvn;
2692 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
2693 /* this node doesn't have the requested data */
2694 if (orig_ttvn != req_ttvn ||
2695 !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
2696 ntohs(tt_data->num_vlan)))
2699 /* If the full table has been explicitly requested */
2700 if (tt_data->flags & BATADV_TT_FULL_TABLE ||
2701 !req_dst_orig_node->tt_buff)
2706 /* TT fragmentation hasn't been implemented yet, so send as many
2707 * TT entries fit a single packet as possible only
2710 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
2711 tt_len = req_dst_orig_node->tt_buff_len;
2713 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2720 /* Copy the last orig_node's OGM buffer */
2721 memcpy(tt_change, req_dst_orig_node->tt_buff,
2722 req_dst_orig_node->tt_buff_len);
2723 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2725 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2726 * in the initial part
2729 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2736 /* fill the rest of the tvlv with the real TT entries */
2737 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
2739 batadv_tt_global_valid,
2743 /* Don't send the response, if larger than fragmented packet. */
2744 tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
2745 if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
2746 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
2747 "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
2748 res_dst_orig_node->orig);
2752 tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2753 tvlv_tt_data->ttvn = req_ttvn;
2756 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2758 batadv_dbg(BATADV_DBG_TT, bat_priv,
2759 "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2760 res_dst_orig_node->orig, req_dst_orig_node->orig,
2761 full_table ? 'F' : '.', req_ttvn);
2763 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2765 batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
2766 req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2773 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2776 if (res_dst_orig_node)
2777 batadv_orig_node_free_ref(res_dst_orig_node);
2778 if (req_dst_orig_node)
2779 batadv_orig_node_free_ref(req_dst_orig_node);
2780 kfree(tvlv_tt_data);
2785 * batadv_send_my_tt_response - send reply to tt request concerning this node's
2787 * @bat_priv: the bat priv with all the soft interface information
2788 * @tt_data: tt data containing the tt request information
2789 * @req_src: mac address of tt request sender
2791 * Return: true if tt request reply was sent, false otherwise.
2793 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
2794 struct batadv_tvlv_tt_data *tt_data,
2797 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2798 struct batadv_hard_iface *primary_if = NULL;
2799 struct batadv_tvlv_tt_change *tt_change;
2800 struct batadv_orig_node *orig_node;
2801 u8 my_ttvn, req_ttvn;
2806 batadv_dbg(BATADV_DBG_TT, bat_priv,
2807 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2808 req_src, tt_data->ttvn,
2809 ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2811 spin_lock_bh(&bat_priv->tt.commit_lock);
2813 my_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
2814 req_ttvn = tt_data->ttvn;
2816 orig_node = batadv_orig_hash_find(bat_priv, req_src);
2820 primary_if = batadv_primary_if_get_selected(bat_priv);
2824 /* If the full table has been explicitly requested or the gap
2825 * is too big send the whole local translation table
2827 if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
2828 !bat_priv->tt.last_changeset)
2833 /* TT fragmentation hasn't been implemented yet, so send as many
2834 * TT entries fit a single packet as possible only
2837 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
2839 tt_len = bat_priv->tt.last_changeset_len;
2840 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2847 /* Copy the last orig_node's OGM buffer */
2848 memcpy(tt_change, bat_priv->tt.last_changeset,
2849 bat_priv->tt.last_changeset_len);
2850 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2852 req_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
2854 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2855 * in the initial part
2858 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2865 /* fill the rest of the tvlv with the real TT entries */
2866 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
2868 batadv_tt_local_valid, NULL);
2871 tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2872 tvlv_tt_data->ttvn = req_ttvn;
2875 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2877 batadv_dbg(BATADV_DBG_TT, bat_priv,
2878 "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2879 orig_node->orig, full_table ? 'F' : '.', req_ttvn);
2881 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2883 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2884 req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2890 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2892 spin_unlock_bh(&bat_priv->tt.commit_lock);
2894 batadv_orig_node_free_ref(orig_node);
2896 batadv_hardif_free_ref(primary_if);
2897 kfree(tvlv_tt_data);
2898 /* The packet was for this host, so it doesn't need to be re-routed */
2903 * batadv_send_tt_response - send reply to tt request
2904 * @bat_priv: the bat priv with all the soft interface information
2905 * @tt_data: tt data containing the tt request information
2906 * @req_src: mac address of tt request sender
2907 * @req_dst: mac address of tt request recipient
2909 * Return: true if tt request reply was sent, false otherwise.
2911 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
2912 struct batadv_tvlv_tt_data *tt_data,
2913 u8 *req_src, u8 *req_dst)
2915 if (batadv_is_my_mac(bat_priv, req_dst))
2916 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
2917 return batadv_send_other_tt_response(bat_priv, tt_data, req_src,
2921 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
2922 struct batadv_orig_node *orig_node,
2923 struct batadv_tvlv_tt_change *tt_change,
2924 u16 tt_num_changes, u8 ttvn)
2929 for (i = 0; i < tt_num_changes; i++) {
2930 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
2931 roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
2932 batadv_tt_global_del(bat_priv, orig_node,
2933 (tt_change + i)->addr,
2934 ntohs((tt_change + i)->vid),
2935 "tt removed by changes",
2938 if (!batadv_tt_global_add(bat_priv, orig_node,
2939 (tt_change + i)->addr,
2940 ntohs((tt_change + i)->vid),
2941 (tt_change + i)->flags, ttvn))
2942 /* In case of problem while storing a
2943 * global_entry, we stop the updating
2944 * procedure without committing the
2945 * ttvn change. This will avoid to send
2946 * corrupted data on tt_request
2951 set_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
2954 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
2955 struct batadv_tvlv_tt_change *tt_change,
2956 u8 ttvn, u8 *resp_src,
2959 struct batadv_orig_node *orig_node;
2961 orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2965 /* Purge the old table first.. */
2966 batadv_tt_global_del_orig(bat_priv, orig_node, -1,
2967 "Received full table");
2969 _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
2972 spin_lock_bh(&orig_node->tt_buff_lock);
2973 kfree(orig_node->tt_buff);
2974 orig_node->tt_buff_len = 0;
2975 orig_node->tt_buff = NULL;
2976 spin_unlock_bh(&orig_node->tt_buff_lock);
2978 atomic_set(&orig_node->last_ttvn, ttvn);
2982 batadv_orig_node_free_ref(orig_node);
2985 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
2986 struct batadv_orig_node *orig_node,
2987 u16 tt_num_changes, u8 ttvn,
2988 struct batadv_tvlv_tt_change *tt_change)
2990 _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
2991 tt_num_changes, ttvn);
2993 batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
2994 batadv_tt_len(tt_num_changes));
2995 atomic_set(&orig_node->last_ttvn, ttvn);
2999 * batadv_is_my_client - check if a client is served by the local node
3000 * @bat_priv: the bat priv with all the soft interface information
3001 * @addr: the mac address of the client to check
3002 * @vid: VLAN identifier
3004 * Return: true if the client is served by this node, false otherwise.
3006 bool batadv_is_my_client(struct batadv_priv *bat_priv, const u8 *addr,
3009 struct batadv_tt_local_entry *tt_local_entry;
3012 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3013 if (!tt_local_entry)
3015 /* Check if the client has been logically deleted (but is kept for
3016 * consistency purpose)
3018 if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
3019 (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
3024 batadv_tt_local_entry_free_ref(tt_local_entry);
3029 * batadv_handle_tt_response - process incoming tt reply
3030 * @bat_priv: the bat priv with all the soft interface information
3031 * @tt_data: tt data containing the tt request information
3032 * @resp_src: mac address of tt reply sender
3033 * @num_entries: number of tt change entries appended to the tt data
3035 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
3036 struct batadv_tvlv_tt_data *tt_data,
3037 u8 *resp_src, u16 num_entries)
3039 struct batadv_tt_req_node *node;
3040 struct hlist_node *safe;
3041 struct batadv_orig_node *orig_node = NULL;
3042 struct batadv_tvlv_tt_change *tt_change;
3043 u8 *tvlv_ptr = (u8 *)tt_data;
3046 batadv_dbg(BATADV_DBG_TT, bat_priv,
3047 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
3048 resp_src, tt_data->ttvn, num_entries,
3049 ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3051 orig_node = batadv_orig_hash_find(bat_priv, resp_src);
3055 spin_lock_bh(&orig_node->tt_lock);
3057 change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
3058 change_offset *= ntohs(tt_data->num_vlan);
3059 change_offset += sizeof(*tt_data);
3060 tvlv_ptr += change_offset;
3062 tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
3063 if (tt_data->flags & BATADV_TT_FULL_TABLE) {
3064 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
3065 resp_src, num_entries);
3067 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
3068 tt_data->ttvn, tt_change);
3071 /* Recalculate the CRC for this orig_node and store it */
3072 batadv_tt_global_update_crc(bat_priv, orig_node);
3074 spin_unlock_bh(&orig_node->tt_lock);
3076 /* Delete the tt_req_node from pending tt_requests list */
3077 spin_lock_bh(&bat_priv->tt.req_list_lock);
3078 hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
3079 if (!batadv_compare_eth(node->addr, resp_src))
3081 hlist_del_init(&node->list);
3085 spin_unlock_bh(&bat_priv->tt.req_list_lock);
3088 batadv_orig_node_free_ref(orig_node);
3091 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
3093 struct batadv_tt_roam_node *node, *safe;
3095 spin_lock_bh(&bat_priv->tt.roam_list_lock);
3097 list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3098 list_del(&node->list);
3102 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3105 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
3107 struct batadv_tt_roam_node *node, *safe;
3109 spin_lock_bh(&bat_priv->tt.roam_list_lock);
3110 list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3111 if (!batadv_has_timed_out(node->first_time,
3112 BATADV_ROAMING_MAX_TIME))
3115 list_del(&node->list);
3118 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3122 * batadv_tt_check_roam_count - check if a client has roamed too frequently
3123 * @bat_priv: the bat priv with all the soft interface information
3124 * @client: mac address of the roaming client
3126 * This function checks whether the client already reached the
3127 * maximum number of possible roaming phases. In this case the ROAMING_ADV
3130 * Return: true if the ROAMING_ADV can be sent, false otherwise
3132 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, u8 *client)
3134 struct batadv_tt_roam_node *tt_roam_node;
3137 spin_lock_bh(&bat_priv->tt.roam_list_lock);
3138 /* The new tt_req will be issued only if I'm not waiting for a
3139 * reply from the same orig_node yet
3141 list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
3142 if (!batadv_compare_eth(tt_roam_node->addr, client))
3145 if (batadv_has_timed_out(tt_roam_node->first_time,
3146 BATADV_ROAMING_MAX_TIME))
3149 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
3150 /* Sorry, you roamed too many times! */
3157 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
3161 tt_roam_node->first_time = jiffies;
3162 atomic_set(&tt_roam_node->counter,
3163 BATADV_ROAMING_MAX_COUNT - 1);
3164 ether_addr_copy(tt_roam_node->addr, client);
3166 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
3171 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3176 * batadv_send_roam_adv - send a roaming advertisement message
3177 * @bat_priv: the bat priv with all the soft interface information
3178 * @client: mac address of the roaming client
3179 * @vid: VLAN identifier
3180 * @orig_node: message destination
3182 * Send a ROAMING_ADV message to the node which was previously serving this
3183 * client. This is done to inform the node that from now on all traffic destined
3184 * for this particular roamed client has to be forwarded to the sender of the
3187 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
3189 struct batadv_orig_node *orig_node)
3191 struct batadv_hard_iface *primary_if;
3192 struct batadv_tvlv_roam_adv tvlv_roam;
3194 primary_if = batadv_primary_if_get_selected(bat_priv);
3198 /* before going on we have to check whether the client has
3199 * already roamed to us too many times
3201 if (!batadv_tt_check_roam_count(bat_priv, client))
3204 batadv_dbg(BATADV_DBG_TT, bat_priv,
3205 "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
3206 orig_node->orig, client, BATADV_PRINT_VID(vid));
3208 batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
3210 memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
3211 tvlv_roam.vid = htons(vid);
3213 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3214 orig_node->orig, BATADV_TVLV_ROAM, 1,
3215 &tvlv_roam, sizeof(tvlv_roam));
3219 batadv_hardif_free_ref(primary_if);
3222 static void batadv_tt_purge(struct work_struct *work)
3224 struct delayed_work *delayed_work;
3225 struct batadv_priv_tt *priv_tt;
3226 struct batadv_priv *bat_priv;
3228 delayed_work = container_of(work, struct delayed_work, work);
3229 priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
3230 bat_priv = container_of(priv_tt, struct batadv_priv, tt);
3232 batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
3233 batadv_tt_global_purge(bat_priv);
3234 batadv_tt_req_purge(bat_priv);
3235 batadv_tt_roam_purge(bat_priv);
3237 queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3238 msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3241 void batadv_tt_free(struct batadv_priv *bat_priv)
3243 batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
3244 batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
3246 cancel_delayed_work_sync(&bat_priv->tt.work);
3248 batadv_tt_local_table_free(bat_priv);
3249 batadv_tt_global_table_free(bat_priv);
3250 batadv_tt_req_list_free(bat_priv);
3251 batadv_tt_changes_list_free(bat_priv);
3252 batadv_tt_roam_list_free(bat_priv);
3254 kfree(bat_priv->tt.last_changeset);
3258 * batadv_tt_local_set_flags - set or unset the specified flags on the local
3259 * table and possibly count them in the TT size
3260 * @bat_priv: the bat priv with all the soft interface information
3261 * @flags: the flag to switch
3262 * @enable: whether to set or unset the flag
3263 * @count: whether to increase the TT size by the number of changed entries
3265 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv, u16 flags,
3266 bool enable, bool count)
3268 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3269 struct batadv_tt_common_entry *tt_common_entry;
3270 u16 changed_num = 0;
3271 struct hlist_head *head;
3277 for (i = 0; i < hash->size; i++) {
3278 head = &hash->table[i];
3281 hlist_for_each_entry_rcu(tt_common_entry,
3284 if ((tt_common_entry->flags & flags) == flags)
3286 tt_common_entry->flags |= flags;
3288 if (!(tt_common_entry->flags & flags))
3290 tt_common_entry->flags &= ~flags;
3297 batadv_tt_local_size_inc(bat_priv,
3298 tt_common_entry->vid);
3304 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3305 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3307 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3308 struct batadv_tt_common_entry *tt_common;
3309 struct batadv_tt_local_entry *tt_local;
3310 struct batadv_softif_vlan *vlan;
3311 struct hlist_node *node_tmp;
3312 struct hlist_head *head;
3313 spinlock_t *list_lock; /* protects write access to the hash lists */
3319 for (i = 0; i < hash->size; i++) {
3320 head = &hash->table[i];
3321 list_lock = &hash->list_locks[i];
3323 spin_lock_bh(list_lock);
3324 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3326 if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3329 batadv_dbg(BATADV_DBG_TT, bat_priv,
3330 "Deleting local tt entry (%pM, vid: %d): pending\n",
3332 BATADV_PRINT_VID(tt_common->vid));
3334 batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3335 hlist_del_rcu(&tt_common->hash_entry);
3336 tt_local = container_of(tt_common,
3337 struct batadv_tt_local_entry,
3340 /* decrease the reference held for this vlan */
3341 vlan = batadv_softif_vlan_get(bat_priv, tt_common->vid);
3343 batadv_softif_vlan_free_ref(vlan);
3344 batadv_softif_vlan_free_ref(vlan);
3347 batadv_tt_local_entry_free_ref(tt_local);
3349 spin_unlock_bh(list_lock);
3354 * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3355 * which have been queued in the time since the last commit
3356 * @bat_priv: the bat priv with all the soft interface information
3358 * Caller must hold tt->commit_lock.
3360 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3362 lockdep_assert_held(&bat_priv->tt.commit_lock);
3364 /* Update multicast addresses in local translation table */
3365 batadv_mcast_mla_update(bat_priv);
3367 if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3368 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3369 batadv_tt_tvlv_container_update(bat_priv);
3373 batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3375 batadv_tt_local_purge_pending_clients(bat_priv);
3376 batadv_tt_local_update_crc(bat_priv);
3378 /* Increment the TTVN only once per OGM interval */
3379 atomic_inc(&bat_priv->tt.vn);
3380 batadv_dbg(BATADV_DBG_TT, bat_priv,
3381 "Local changes committed, updating to ttvn %u\n",
3382 (u8)atomic_read(&bat_priv->tt.vn));
3384 /* reset the sending counter */
3385 atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3386 batadv_tt_tvlv_container_update(bat_priv);
3390 * batadv_tt_local_commit_changes - commit all pending local tt changes which
3391 * have been queued in the time since the last commit
3392 * @bat_priv: the bat priv with all the soft interface information
3394 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3396 spin_lock_bh(&bat_priv->tt.commit_lock);
3397 batadv_tt_local_commit_changes_nolock(bat_priv);
3398 spin_unlock_bh(&bat_priv->tt.commit_lock);
3401 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, u8 *src, u8 *dst,
3404 struct batadv_tt_local_entry *tt_local_entry = NULL;
3405 struct batadv_tt_global_entry *tt_global_entry = NULL;
3406 struct batadv_softif_vlan *vlan;
3409 vlan = batadv_softif_vlan_get(bat_priv, vid);
3413 if (!atomic_read(&vlan->ap_isolation))
3416 tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3417 if (!tt_local_entry)
3420 tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
3421 if (!tt_global_entry)
3424 if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3430 batadv_softif_vlan_free_ref(vlan);
3431 if (tt_global_entry)
3432 batadv_tt_global_entry_free_ref(tt_global_entry);
3434 batadv_tt_local_entry_free_ref(tt_local_entry);
3439 * batadv_tt_update_orig - update global translation table with new tt
3440 * information received via ogms
3441 * @bat_priv: the bat priv with all the soft interface information
3442 * @orig_node: the orig_node of the ogm
3443 * @tt_buff: pointer to the first tvlv VLAN entry
3444 * @tt_num_vlan: number of tvlv VLAN entries
3445 * @tt_change: pointer to the first entry in the TT buffer
3446 * @tt_num_changes: number of tt changes inside the tt buffer
3447 * @ttvn: translation table version number of this changeset
3449 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
3450 struct batadv_orig_node *orig_node,
3451 const void *tt_buff, u16 tt_num_vlan,
3452 struct batadv_tvlv_tt_change *tt_change,
3453 u16 tt_num_changes, u8 ttvn)
3455 u8 orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn);
3456 struct batadv_tvlv_tt_vlan_data *tt_vlan;
3457 bool full_table = true;
3460 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
3461 has_tt_init = test_bit(BATADV_ORIG_CAPA_HAS_TT,
3462 &orig_node->capa_initialized);
3464 /* orig table not initialised AND first diff is in the OGM OR the ttvn
3465 * increased by one -> we can apply the attached changes
3467 if ((!has_tt_init && ttvn == 1) || ttvn - orig_ttvn == 1) {
3468 /* the OGM could not contain the changes due to their size or
3469 * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3471 * In this case send a tt request
3473 if (!tt_num_changes) {
3478 spin_lock_bh(&orig_node->tt_lock);
3480 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
3483 /* Even if we received the precomputed crc with the OGM, we
3484 * prefer to recompute it to spot any possible inconsistency
3485 * in the global table
3487 batadv_tt_global_update_crc(bat_priv, orig_node);
3489 spin_unlock_bh(&orig_node->tt_lock);
3491 /* The ttvn alone is not enough to guarantee consistency
3492 * because a single value could represent different states
3493 * (due to the wrap around). Thus a node has to check whether
3494 * the resulting table (after applying the changes) is still
3495 * consistent or not. E.g. a node could disconnect while its
3496 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3497 * checking the CRC value is mandatory to detect the
3500 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
3504 /* if we missed more than one change or our tables are not
3505 * in sync anymore -> request fresh tt data
3507 if (!has_tt_init || ttvn != orig_ttvn ||
3508 !batadv_tt_global_check_crc(orig_node, tt_vlan,
3511 batadv_dbg(BATADV_DBG_TT, bat_priv,
3512 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3513 orig_node->orig, ttvn, orig_ttvn,
3515 batadv_send_tt_request(bat_priv, orig_node, ttvn,
3516 tt_vlan, tt_num_vlan,
3524 * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3525 * @bat_priv: the bat priv with all the soft interface information
3526 * @addr: the mac address of the client to check
3527 * @vid: VLAN identifier
3529 * Return: true if we know that the client has moved from its old originator
3530 * to another one. This entry is still kept for consistency purposes and will be
3531 * deleted later by a DEL or because of timeout
3533 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
3534 u8 *addr, unsigned short vid)
3536 struct batadv_tt_global_entry *tt_global_entry;
3539 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
3540 if (!tt_global_entry)
3543 ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3544 batadv_tt_global_entry_free_ref(tt_global_entry);
3550 * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3551 * @bat_priv: the bat priv with all the soft interface information
3552 * @addr: the mac address of the local client to query
3553 * @vid: VLAN identifier
3555 * Return: true if the local client is known to be roaming (it is not served by
3556 * this node anymore) or not. If yes, the client is still present in the table
3557 * to keep the latter consistent with the node TTVN
3559 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
3560 u8 *addr, unsigned short vid)
3562 struct batadv_tt_local_entry *tt_local_entry;
3565 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3566 if (!tt_local_entry)
3569 ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3570 batadv_tt_local_entry_free_ref(tt_local_entry);
3575 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
3576 struct batadv_orig_node *orig_node,
3577 const unsigned char *addr,
3582 if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
3583 BATADV_TT_CLIENT_TEMP,
3584 atomic_read(&orig_node->last_ttvn)))
3587 batadv_dbg(BATADV_DBG_TT, bat_priv,
3588 "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3589 addr, BATADV_PRINT_VID(vid), orig_node->orig);
3596 * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
3597 * maximum packet size that can be transported through the mesh
3598 * @soft_iface: netdev struct of the mesh interface
3600 * Remove entries older than 'timeout' and half timeout if more entries need
3603 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
3605 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
3606 int packet_size_max = atomic_read(&bat_priv->packet_size_max);
3607 int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
3608 bool reduced = false;
3610 spin_lock_bh(&bat_priv->tt.commit_lock);
3613 table_size = batadv_tt_local_table_transmit_size(bat_priv);
3614 if (packet_size_max >= table_size)
3617 batadv_tt_local_purge(bat_priv, timeout);
3618 batadv_tt_local_purge_pending_clients(bat_priv);
3622 net_ratelimited_function(batadv_info, soft_iface,
3623 "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3627 /* commit these changes immediately, to avoid synchronization problem
3631 batadv_tt_local_commit_changes_nolock(bat_priv);
3633 spin_unlock_bh(&bat_priv->tt.commit_lock);
3637 * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3638 * @bat_priv: the bat priv with all the soft interface information
3639 * @orig: the orig_node of the ogm
3640 * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3641 * @tvlv_value: tvlv buffer containing the gateway data
3642 * @tvlv_value_len: tvlv buffer length
3644 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
3645 struct batadv_orig_node *orig,
3646 u8 flags, void *tvlv_value,
3649 struct batadv_tvlv_tt_vlan_data *tt_vlan;
3650 struct batadv_tvlv_tt_change *tt_change;
3651 struct batadv_tvlv_tt_data *tt_data;
3652 u16 num_entries, num_vlan;
3654 if (tvlv_value_len < sizeof(*tt_data))
3657 tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3658 tvlv_value_len -= sizeof(*tt_data);
3660 num_vlan = ntohs(tt_data->num_vlan);
3662 if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
3665 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3666 tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
3667 tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
3669 num_entries = batadv_tt_entries(tvlv_value_len);
3671 batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
3672 num_entries, tt_data->ttvn);
3676 * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3678 * @bat_priv: the bat priv with all the soft interface information
3679 * @src: mac address of tt tvlv sender
3680 * @dst: mac address of tt tvlv recipient
3681 * @tvlv_value: tvlv buffer containing the tt data
3682 * @tvlv_value_len: tvlv buffer length
3684 * Return: NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3687 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3692 struct batadv_tvlv_tt_data *tt_data;
3693 u16 tt_vlan_len, tt_num_entries;
3697 if (tvlv_value_len < sizeof(*tt_data))
3698 return NET_RX_SUCCESS;
3700 tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3701 tvlv_value_len -= sizeof(*tt_data);
3703 tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
3704 tt_vlan_len *= ntohs(tt_data->num_vlan);
3706 if (tvlv_value_len < tt_vlan_len)
3707 return NET_RX_SUCCESS;
3709 tvlv_value_len -= tt_vlan_len;
3710 tt_num_entries = batadv_tt_entries(tvlv_value_len);
3712 switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
3713 case BATADV_TT_REQUEST:
3714 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
3716 /* If this node cannot provide a TT response the tt_request is
3719 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
3721 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3726 batadv_dbg(BATADV_DBG_TT, bat_priv,
3727 "Routing TT_REQUEST to %pM [%c]\n",
3729 /* tvlv API will re-route the packet */
3733 case BATADV_TT_RESPONSE:
3734 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
3736 if (batadv_is_my_mac(bat_priv, dst)) {
3737 batadv_handle_tt_response(bat_priv, tt_data,
3738 src, tt_num_entries);
3739 return NET_RX_SUCCESS;
3742 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3747 batadv_dbg(BATADV_DBG_TT, bat_priv,
3748 "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
3750 /* tvlv API will re-route the packet */
3754 return NET_RX_SUCCESS;
3758 * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3759 * @bat_priv: the bat priv with all the soft interface information
3760 * @src: mac address of tt tvlv sender
3761 * @dst: mac address of tt tvlv recipient
3762 * @tvlv_value: tvlv buffer containing the tt data
3763 * @tvlv_value_len: tvlv buffer length
3765 * Return: NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3768 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3773 struct batadv_tvlv_roam_adv *roaming_adv;
3774 struct batadv_orig_node *orig_node = NULL;
3776 /* If this node is not the intended recipient of the
3777 * roaming advertisement the packet is forwarded
3778 * (the tvlv API will re-route the packet).
3780 if (!batadv_is_my_mac(bat_priv, dst))
3783 if (tvlv_value_len < sizeof(*roaming_adv))
3786 orig_node = batadv_orig_hash_find(bat_priv, src);
3790 batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
3791 roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
3793 batadv_dbg(BATADV_DBG_TT, bat_priv,
3794 "Received ROAMING_ADV from %pM (client %pM)\n",
3795 src, roaming_adv->client);
3797 batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
3798 ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
3799 atomic_read(&orig_node->last_ttvn) + 1);
3803 batadv_orig_node_free_ref(orig_node);
3804 return NET_RX_SUCCESS;
3808 * batadv_tt_init - initialise the translation table internals
3809 * @bat_priv: the bat priv with all the soft interface information
3811 * Return: 0 on success or negative error number in case of failure.
3813 int batadv_tt_init(struct batadv_priv *bat_priv)
3817 /* synchronized flags must be remote */
3818 BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
3820 ret = batadv_tt_local_init(bat_priv);
3824 ret = batadv_tt_global_init(bat_priv);
3828 batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
3829 batadv_tt_tvlv_unicast_handler_v1,
3830 BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
3832 batadv_tvlv_handler_register(bat_priv, NULL,
3833 batadv_roam_tvlv_unicast_handler_v1,
3834 BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
3836 INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
3837 queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3838 msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3844 * batadv_tt_global_is_isolated - check if a client is marked as isolated
3845 * @bat_priv: the bat priv with all the soft interface information
3846 * @addr: the mac address of the client
3847 * @vid: the identifier of the VLAN where this client is connected
3849 * Return: true if the client is marked with the TT_CLIENT_ISOLA flag, false
3852 bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
3853 const u8 *addr, unsigned short vid)
3855 struct batadv_tt_global_entry *tt;
3858 tt = batadv_tt_global_hash_find(bat_priv, addr, vid);
3862 ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA;
3864 batadv_tt_global_entry_free_ref(tt);