Merge tag 'iommu-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
[linux/fpc-iii.git] / net / batman-adv / translation-table.c
blobcd09916f97fe97a1139b01cf3859e45140e927b6
1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2007-2020 B.A.T.M.A.N. contributors:
4 * Marek Lindner, Simon Wunderlich, Antonio Quartulli
5 */
7 #include "translation-table.h"
8 #include "main.h"
10 #include <linux/atomic.h>
11 #include <linux/bitops.h>
12 #include <linux/build_bug.h>
13 #include <linux/byteorder/generic.h>
14 #include <linux/cache.h>
15 #include <linux/compiler.h>
16 #include <linux/crc32c.h>
17 #include <linux/errno.h>
18 #include <linux/etherdevice.h>
19 #include <linux/gfp.h>
20 #include <linux/if_ether.h>
21 #include <linux/init.h>
22 #include <linux/jhash.h>
23 #include <linux/jiffies.h>
24 #include <linux/kernel.h>
25 #include <linux/kref.h>
26 #include <linux/list.h>
27 #include <linux/lockdep.h>
28 #include <linux/net.h>
29 #include <linux/netdevice.h>
30 #include <linux/netlink.h>
31 #include <linux/rculist.h>
32 #include <linux/rcupdate.h>
33 #include <linux/skbuff.h>
34 #include <linux/slab.h>
35 #include <linux/spinlock.h>
36 #include <linux/stddef.h>
37 #include <linux/string.h>
38 #include <linux/workqueue.h>
39 #include <net/genetlink.h>
40 #include <net/netlink.h>
41 #include <net/sock.h>
42 #include <uapi/linux/batadv_packet.h>
43 #include <uapi/linux/batman_adv.h>
45 #include "bridge_loop_avoidance.h"
46 #include "hard-interface.h"
47 #include "hash.h"
48 #include "log.h"
49 #include "netlink.h"
50 #include "originator.h"
51 #include "soft-interface.h"
52 #include "tvlv.h"
54 static struct kmem_cache *batadv_tl_cache __read_mostly;
55 static struct kmem_cache *batadv_tg_cache __read_mostly;
56 static struct kmem_cache *batadv_tt_orig_cache __read_mostly;
57 static struct kmem_cache *batadv_tt_change_cache __read_mostly;
58 static struct kmem_cache *batadv_tt_req_cache __read_mostly;
59 static struct kmem_cache *batadv_tt_roam_cache __read_mostly;
61 /* hash class keys */
62 static struct lock_class_key batadv_tt_local_hash_lock_class_key;
63 static struct lock_class_key batadv_tt_global_hash_lock_class_key;
65 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
66 unsigned short vid,
67 struct batadv_orig_node *orig_node);
68 static void batadv_tt_purge(struct work_struct *work);
69 static void
70 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
71 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
72 struct batadv_orig_node *orig_node,
73 const unsigned char *addr,
74 unsigned short vid, const char *message,
75 bool roaming);
77 /**
78 * batadv_compare_tt() - check if two TT entries are the same
79 * @node: the list element pointer of the first TT entry
80 * @data2: pointer to the tt_common_entry of the second TT entry
82 * Compare the MAC address and the VLAN ID of the two TT entries and check if
83 * they are the same TT client.
84 * Return: true if the two TT clients are the same, false otherwise
86 static bool batadv_compare_tt(const struct hlist_node *node, const void *data2)
88 const void *data1 = container_of(node, struct batadv_tt_common_entry,
89 hash_entry);
90 const struct batadv_tt_common_entry *tt1 = data1;
91 const struct batadv_tt_common_entry *tt2 = data2;
93 return (tt1->vid == tt2->vid) && batadv_compare_eth(data1, data2);
96 /**
97 * batadv_choose_tt() - return the index of the tt entry in the hash table
98 * @data: pointer to the tt_common_entry object to map
99 * @size: the size of the hash table
101 * Return: the hash index where the object represented by 'data' should be
102 * stored at.
104 static inline u32 batadv_choose_tt(const void *data, u32 size)
106 struct batadv_tt_common_entry *tt;
107 u32 hash = 0;
109 tt = (struct batadv_tt_common_entry *)data;
110 hash = jhash(&tt->addr, ETH_ALEN, hash);
111 hash = jhash(&tt->vid, sizeof(tt->vid), hash);
113 return hash % size;
117 * batadv_tt_hash_find() - look for a client in the given hash table
118 * @hash: the hash table to search
119 * @addr: the mac address of the client to look for
120 * @vid: VLAN identifier
122 * Return: a pointer to the tt_common struct belonging to the searched client if
123 * found, NULL otherwise.
125 static struct batadv_tt_common_entry *
126 batadv_tt_hash_find(struct batadv_hashtable *hash, const u8 *addr,
127 unsigned short vid)
129 struct hlist_head *head;
130 struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL;
131 u32 index;
133 if (!hash)
134 return NULL;
136 ether_addr_copy(to_search.addr, addr);
137 to_search.vid = vid;
139 index = batadv_choose_tt(&to_search, hash->size);
140 head = &hash->table[index];
142 rcu_read_lock();
143 hlist_for_each_entry_rcu(tt, head, hash_entry) {
144 if (!batadv_compare_eth(tt, addr))
145 continue;
147 if (tt->vid != vid)
148 continue;
150 if (!kref_get_unless_zero(&tt->refcount))
151 continue;
153 tt_tmp = tt;
154 break;
156 rcu_read_unlock();
158 return tt_tmp;
162 * batadv_tt_local_hash_find() - search the local table for a given client
163 * @bat_priv: the bat priv with all the soft interface information
164 * @addr: the mac address of the client to look for
165 * @vid: VLAN identifier
167 * Return: a pointer to the corresponding tt_local_entry struct if the client is
168 * found, NULL otherwise.
170 static struct batadv_tt_local_entry *
171 batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
172 unsigned short vid)
174 struct batadv_tt_common_entry *tt_common_entry;
175 struct batadv_tt_local_entry *tt_local_entry = NULL;
177 tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, addr,
178 vid);
179 if (tt_common_entry)
180 tt_local_entry = container_of(tt_common_entry,
181 struct batadv_tt_local_entry,
182 common);
183 return tt_local_entry;
187 * batadv_tt_global_hash_find() - search the global table for a given client
188 * @bat_priv: the bat priv with all the soft interface information
189 * @addr: the mac address of the client to look for
190 * @vid: VLAN identifier
192 * Return: a pointer to the corresponding tt_global_entry struct if the client
193 * is found, NULL otherwise.
195 struct batadv_tt_global_entry *
196 batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
197 unsigned short vid)
199 struct batadv_tt_common_entry *tt_common_entry;
200 struct batadv_tt_global_entry *tt_global_entry = NULL;
202 tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, addr,
203 vid);
204 if (tt_common_entry)
205 tt_global_entry = container_of(tt_common_entry,
206 struct batadv_tt_global_entry,
207 common);
208 return tt_global_entry;
212 * batadv_tt_local_entry_free_rcu() - free the tt_local_entry
213 * @rcu: rcu pointer of the tt_local_entry
215 static void batadv_tt_local_entry_free_rcu(struct rcu_head *rcu)
217 struct batadv_tt_local_entry *tt_local_entry;
219 tt_local_entry = container_of(rcu, struct batadv_tt_local_entry,
220 common.rcu);
222 kmem_cache_free(batadv_tl_cache, tt_local_entry);
226 * batadv_tt_local_entry_release() - release tt_local_entry from lists and queue
227 * for free after rcu grace period
228 * @ref: kref pointer of the nc_node
230 static void batadv_tt_local_entry_release(struct kref *ref)
232 struct batadv_tt_local_entry *tt_local_entry;
234 tt_local_entry = container_of(ref, struct batadv_tt_local_entry,
235 common.refcount);
237 batadv_softif_vlan_put(tt_local_entry->vlan);
239 call_rcu(&tt_local_entry->common.rcu, batadv_tt_local_entry_free_rcu);
243 * batadv_tt_local_entry_put() - decrement the tt_local_entry refcounter and
244 * possibly release it
245 * @tt_local_entry: tt_local_entry to be free'd
247 static void
248 batadv_tt_local_entry_put(struct batadv_tt_local_entry *tt_local_entry)
250 kref_put(&tt_local_entry->common.refcount,
251 batadv_tt_local_entry_release);
255 * batadv_tt_global_entry_free_rcu() - free the tt_global_entry
256 * @rcu: rcu pointer of the tt_global_entry
258 static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu)
260 struct batadv_tt_global_entry *tt_global_entry;
262 tt_global_entry = container_of(rcu, struct batadv_tt_global_entry,
263 common.rcu);
265 kmem_cache_free(batadv_tg_cache, tt_global_entry);
269 * batadv_tt_global_entry_release() - release tt_global_entry from lists and
270 * queue for free after rcu grace period
271 * @ref: kref pointer of the nc_node
273 static void batadv_tt_global_entry_release(struct kref *ref)
275 struct batadv_tt_global_entry *tt_global_entry;
277 tt_global_entry = container_of(ref, struct batadv_tt_global_entry,
278 common.refcount);
280 batadv_tt_global_del_orig_list(tt_global_entry);
282 call_rcu(&tt_global_entry->common.rcu, batadv_tt_global_entry_free_rcu);
286 * batadv_tt_global_entry_put() - decrement the tt_global_entry refcounter and
287 * possibly release it
288 * @tt_global_entry: tt_global_entry to be free'd
290 void batadv_tt_global_entry_put(struct batadv_tt_global_entry *tt_global_entry)
292 kref_put(&tt_global_entry->common.refcount,
293 batadv_tt_global_entry_release);
297 * batadv_tt_global_hash_count() - count the number of orig entries
298 * @bat_priv: the bat priv with all the soft interface information
299 * @addr: the mac address of the client to count entries for
300 * @vid: VLAN identifier
302 * Return: the number of originators advertising the given address/data
303 * (excluding our self).
305 int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
306 const u8 *addr, unsigned short vid)
308 struct batadv_tt_global_entry *tt_global_entry;
309 int count;
311 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
312 if (!tt_global_entry)
313 return 0;
315 count = atomic_read(&tt_global_entry->orig_list_count);
316 batadv_tt_global_entry_put(tt_global_entry);
318 return count;
322 * batadv_tt_local_size_mod() - change the size by v of the local table
323 * identified by vid
324 * @bat_priv: the bat priv with all the soft interface information
325 * @vid: the VLAN identifier of the sub-table to change
326 * @v: the amount to sum to the local table size
328 static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
329 unsigned short vid, int v)
331 struct batadv_softif_vlan *vlan;
333 vlan = batadv_softif_vlan_get(bat_priv, vid);
334 if (!vlan)
335 return;
337 atomic_add(v, &vlan->tt.num_entries);
339 batadv_softif_vlan_put(vlan);
343 * batadv_tt_local_size_inc() - increase by one the local table size for the
344 * given vid
345 * @bat_priv: the bat priv with all the soft interface information
346 * @vid: the VLAN identifier
348 static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv,
349 unsigned short vid)
351 batadv_tt_local_size_mod(bat_priv, vid, 1);
355 * batadv_tt_local_size_dec() - decrease by one the local table size for the
356 * given vid
357 * @bat_priv: the bat priv with all the soft interface information
358 * @vid: the VLAN identifier
360 static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv,
361 unsigned short vid)
363 batadv_tt_local_size_mod(bat_priv, vid, -1);
367 * batadv_tt_global_size_mod() - change the size by v of the global table
368 * for orig_node identified by vid
369 * @orig_node: the originator for which the table has to be modified
370 * @vid: the VLAN identifier
371 * @v: the amount to sum to the global table size
373 static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node,
374 unsigned short vid, int v)
376 struct batadv_orig_node_vlan *vlan;
378 vlan = batadv_orig_node_vlan_new(orig_node, vid);
379 if (!vlan)
380 return;
382 if (atomic_add_return(v, &vlan->tt.num_entries) == 0) {
383 spin_lock_bh(&orig_node->vlan_list_lock);
384 if (!hlist_unhashed(&vlan->list)) {
385 hlist_del_init_rcu(&vlan->list);
386 batadv_orig_node_vlan_put(vlan);
388 spin_unlock_bh(&orig_node->vlan_list_lock);
391 batadv_orig_node_vlan_put(vlan);
395 * batadv_tt_global_size_inc() - increase by one the global table size for the
396 * given vid
397 * @orig_node: the originator which global table size has to be decreased
398 * @vid: the vlan identifier
400 static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
401 unsigned short vid)
403 batadv_tt_global_size_mod(orig_node, vid, 1);
407 * batadv_tt_global_size_dec() - decrease by one the global table size for the
408 * given vid
409 * @orig_node: the originator which global table size has to be decreased
410 * @vid: the vlan identifier
412 static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
413 unsigned short vid)
415 batadv_tt_global_size_mod(orig_node, vid, -1);
419 * batadv_tt_orig_list_entry_free_rcu() - free the orig_entry
420 * @rcu: rcu pointer of the orig_entry
422 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
424 struct batadv_tt_orig_list_entry *orig_entry;
426 orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu);
428 kmem_cache_free(batadv_tt_orig_cache, orig_entry);
432 * batadv_tt_orig_list_entry_release() - release tt orig entry from lists and
433 * queue for free after rcu grace period
434 * @ref: kref pointer of the tt orig entry
436 static void batadv_tt_orig_list_entry_release(struct kref *ref)
438 struct batadv_tt_orig_list_entry *orig_entry;
440 orig_entry = container_of(ref, struct batadv_tt_orig_list_entry,
441 refcount);
443 batadv_orig_node_put(orig_entry->orig_node);
444 call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
448 * batadv_tt_orig_list_entry_put() - decrement the tt orig entry refcounter and
449 * possibly release it
450 * @orig_entry: tt orig entry to be free'd
452 static void
453 batadv_tt_orig_list_entry_put(struct batadv_tt_orig_list_entry *orig_entry)
455 kref_put(&orig_entry->refcount, batadv_tt_orig_list_entry_release);
459 * batadv_tt_local_event() - store a local TT event (ADD/DEL)
460 * @bat_priv: the bat priv with all the soft interface information
461 * @tt_local_entry: the TT entry involved in the event
462 * @event_flags: flags to store in the event structure
464 static void batadv_tt_local_event(struct batadv_priv *bat_priv,
465 struct batadv_tt_local_entry *tt_local_entry,
466 u8 event_flags)
468 struct batadv_tt_change_node *tt_change_node, *entry, *safe;
469 struct batadv_tt_common_entry *common = &tt_local_entry->common;
470 u8 flags = common->flags | event_flags;
471 bool event_removed = false;
472 bool del_op_requested, del_op_entry;
474 tt_change_node = kmem_cache_alloc(batadv_tt_change_cache, GFP_ATOMIC);
475 if (!tt_change_node)
476 return;
478 tt_change_node->change.flags = flags;
479 memset(tt_change_node->change.reserved, 0,
480 sizeof(tt_change_node->change.reserved));
481 ether_addr_copy(tt_change_node->change.addr, common->addr);
482 tt_change_node->change.vid = htons(common->vid);
484 del_op_requested = flags & BATADV_TT_CLIENT_DEL;
486 /* check for ADD+DEL or DEL+ADD events */
487 spin_lock_bh(&bat_priv->tt.changes_list_lock);
488 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
489 list) {
490 if (!batadv_compare_eth(entry->change.addr, common->addr))
491 continue;
493 /* DEL+ADD in the same orig interval have no effect and can be
494 * removed to avoid silly behaviour on the receiver side. The
495 * other way around (ADD+DEL) can happen in case of roaming of
496 * a client still in the NEW state. Roaming of NEW clients is
497 * now possible due to automatically recognition of "temporary"
498 * clients
500 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
501 if (!del_op_requested && del_op_entry)
502 goto del;
503 if (del_op_requested && !del_op_entry)
504 goto del;
506 /* this is a second add in the same originator interval. It
507 * means that flags have been changed: update them!
509 if (!del_op_requested && !del_op_entry)
510 entry->change.flags = flags;
512 continue;
513 del:
514 list_del(&entry->list);
515 kmem_cache_free(batadv_tt_change_cache, entry);
516 kmem_cache_free(batadv_tt_change_cache, tt_change_node);
517 event_removed = true;
518 goto unlock;
521 /* track the change in the OGMinterval list */
522 list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
524 unlock:
525 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
527 if (event_removed)
528 atomic_dec(&bat_priv->tt.local_changes);
529 else
530 atomic_inc(&bat_priv->tt.local_changes);
534 * batadv_tt_len() - compute length in bytes of given number of tt changes
535 * @changes_num: number of tt changes
537 * Return: computed length in bytes.
539 static int batadv_tt_len(int changes_num)
541 return changes_num * sizeof(struct batadv_tvlv_tt_change);
545 * batadv_tt_entries() - compute the number of entries fitting in tt_len bytes
546 * @tt_len: available space
548 * Return: the number of entries.
550 static u16 batadv_tt_entries(u16 tt_len)
552 return tt_len / batadv_tt_len(1);
556 * batadv_tt_local_table_transmit_size() - calculates the local translation
557 * table size when transmitted over the air
558 * @bat_priv: the bat priv with all the soft interface information
560 * Return: local translation table size in bytes.
562 static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
564 u16 num_vlan = 0;
565 u16 tt_local_entries = 0;
566 struct batadv_softif_vlan *vlan;
567 int hdr_size;
569 rcu_read_lock();
570 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
571 num_vlan++;
572 tt_local_entries += atomic_read(&vlan->tt.num_entries);
574 rcu_read_unlock();
576 /* header size of tvlv encapsulated tt response payload */
577 hdr_size = sizeof(struct batadv_unicast_tvlv_packet);
578 hdr_size += sizeof(struct batadv_tvlv_hdr);
579 hdr_size += sizeof(struct batadv_tvlv_tt_data);
580 hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data);
582 return hdr_size + batadv_tt_len(tt_local_entries);
585 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
587 if (bat_priv->tt.local_hash)
588 return 0;
590 bat_priv->tt.local_hash = batadv_hash_new(1024);
592 if (!bat_priv->tt.local_hash)
593 return -ENOMEM;
595 batadv_hash_set_lock_class(bat_priv->tt.local_hash,
596 &batadv_tt_local_hash_lock_class_key);
598 return 0;
601 static void batadv_tt_global_free(struct batadv_priv *bat_priv,
602 struct batadv_tt_global_entry *tt_global,
603 const char *message)
605 struct batadv_tt_global_entry *tt_removed_entry;
606 struct hlist_node *tt_removed_node;
608 batadv_dbg(BATADV_DBG_TT, bat_priv,
609 "Deleting global tt entry %pM (vid: %d): %s\n",
610 tt_global->common.addr,
611 batadv_print_vid(tt_global->common.vid), message);
613 tt_removed_node = batadv_hash_remove(bat_priv->tt.global_hash,
614 batadv_compare_tt,
615 batadv_choose_tt,
616 &tt_global->common);
617 if (!tt_removed_node)
618 return;
620 /* drop reference of remove hash entry */
621 tt_removed_entry = hlist_entry(tt_removed_node,
622 struct batadv_tt_global_entry,
623 common.hash_entry);
624 batadv_tt_global_entry_put(tt_removed_entry);
628 * batadv_tt_local_add() - add a new client to the local table or update an
629 * existing client
630 * @soft_iface: netdev struct of the mesh interface
631 * @addr: the mac address of the client to add
632 * @vid: VLAN identifier
633 * @ifindex: index of the interface where the client is connected to (useful to
634 * identify wireless clients)
635 * @mark: the value contained in the skb->mark field of the received packet (if
636 * any)
638 * Return: true if the client was successfully added, false otherwise.
640 bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
641 unsigned short vid, int ifindex, u32 mark)
643 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
644 struct batadv_tt_local_entry *tt_local;
645 struct batadv_tt_global_entry *tt_global = NULL;
646 struct net *net = dev_net(soft_iface);
647 struct batadv_softif_vlan *vlan;
648 struct net_device *in_dev = NULL;
649 struct batadv_hard_iface *in_hardif = NULL;
650 struct hlist_head *head;
651 struct batadv_tt_orig_list_entry *orig_entry;
652 int hash_added, table_size, packet_size_max;
653 bool ret = false;
654 bool roamed_back = false;
655 u8 remote_flags;
656 u32 match_mark;
658 if (ifindex != BATADV_NULL_IFINDEX)
659 in_dev = dev_get_by_index(net, ifindex);
661 if (in_dev)
662 in_hardif = batadv_hardif_get_by_netdev(in_dev);
664 tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
666 if (!is_multicast_ether_addr(addr))
667 tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
669 if (tt_local) {
670 tt_local->last_seen = jiffies;
671 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
672 batadv_dbg(BATADV_DBG_TT, bat_priv,
673 "Re-adding pending client %pM (vid: %d)\n",
674 addr, batadv_print_vid(vid));
675 /* whatever the reason why the PENDING flag was set,
676 * this is a client which was enqueued to be removed in
677 * this orig_interval. Since it popped up again, the
678 * flag can be reset like it was never enqueued
680 tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
681 goto add_event;
684 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
685 batadv_dbg(BATADV_DBG_TT, bat_priv,
686 "Roaming client %pM (vid: %d) came back to its original location\n",
687 addr, batadv_print_vid(vid));
688 /* the ROAM flag is set because this client roamed away
689 * and the node got a roaming_advertisement message. Now
690 * that the client popped up again at its original
691 * location such flag can be unset
693 tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
694 roamed_back = true;
696 goto check_roaming;
699 /* Ignore the client if we cannot send it in a full table response. */
700 table_size = batadv_tt_local_table_transmit_size(bat_priv);
701 table_size += batadv_tt_len(1);
702 packet_size_max = atomic_read(&bat_priv->packet_size_max);
703 if (table_size > packet_size_max) {
704 net_ratelimited_function(batadv_info, soft_iface,
705 "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
706 table_size, packet_size_max, addr);
707 goto out;
710 tt_local = kmem_cache_alloc(batadv_tl_cache, GFP_ATOMIC);
711 if (!tt_local)
712 goto out;
714 /* increase the refcounter of the related vlan */
715 vlan = batadv_softif_vlan_get(bat_priv, vid);
716 if (!vlan) {
717 net_ratelimited_function(batadv_info, soft_iface,
718 "adding TT local entry %pM to non-existent VLAN %d\n",
719 addr, batadv_print_vid(vid));
720 kmem_cache_free(batadv_tl_cache, tt_local);
721 tt_local = NULL;
722 goto out;
725 batadv_dbg(BATADV_DBG_TT, bat_priv,
726 "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
727 addr, batadv_print_vid(vid),
728 (u8)atomic_read(&bat_priv->tt.vn));
730 ether_addr_copy(tt_local->common.addr, addr);
731 /* The local entry has to be marked as NEW to avoid to send it in
732 * a full table response going out before the next ttvn increment
733 * (consistency check)
735 tt_local->common.flags = BATADV_TT_CLIENT_NEW;
736 tt_local->common.vid = vid;
737 if (batadv_is_wifi_hardif(in_hardif))
738 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
739 kref_init(&tt_local->common.refcount);
740 tt_local->last_seen = jiffies;
741 tt_local->common.added_at = tt_local->last_seen;
742 tt_local->vlan = vlan;
744 /* the batman interface mac and multicast addresses should never be
745 * purged
747 if (batadv_compare_eth(addr, soft_iface->dev_addr) ||
748 is_multicast_ether_addr(addr))
749 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
751 kref_get(&tt_local->common.refcount);
752 hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
753 batadv_choose_tt, &tt_local->common,
754 &tt_local->common.hash_entry);
756 if (unlikely(hash_added != 0)) {
757 /* remove the reference for the hash */
758 batadv_tt_local_entry_put(tt_local);
759 goto out;
762 add_event:
763 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
765 check_roaming:
766 /* Check whether it is a roaming, but don't do anything if the roaming
767 * process has already been handled
769 if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
770 /* These node are probably going to update their tt table */
771 head = &tt_global->orig_list;
772 rcu_read_lock();
773 hlist_for_each_entry_rcu(orig_entry, head, list) {
774 batadv_send_roam_adv(bat_priv, tt_global->common.addr,
775 tt_global->common.vid,
776 orig_entry->orig_node);
778 rcu_read_unlock();
779 if (roamed_back) {
780 batadv_tt_global_free(bat_priv, tt_global,
781 "Roaming canceled");
782 tt_global = NULL;
783 } else {
784 /* The global entry has to be marked as ROAMING and
785 * has to be kept for consistency purpose
787 tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
788 tt_global->roam_at = jiffies;
792 /* store the current remote flags before altering them. This helps
793 * understanding is flags are changing or not
795 remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK;
797 if (batadv_is_wifi_hardif(in_hardif))
798 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
799 else
800 tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI;
802 /* check the mark in the skb: if it's equal to the configured
803 * isolation_mark, it means the packet is coming from an isolated
804 * non-mesh client
806 match_mark = (mark & bat_priv->isolation_mark_mask);
807 if (bat_priv->isolation_mark_mask &&
808 match_mark == bat_priv->isolation_mark)
809 tt_local->common.flags |= BATADV_TT_CLIENT_ISOLA;
810 else
811 tt_local->common.flags &= ~BATADV_TT_CLIENT_ISOLA;
813 /* if any "dynamic" flag has been modified, resend an ADD event for this
814 * entry so that all the nodes can get the new flags
816 if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
817 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
819 ret = true;
820 out:
821 if (in_hardif)
822 batadv_hardif_put(in_hardif);
823 if (in_dev)
824 dev_put(in_dev);
825 if (tt_local)
826 batadv_tt_local_entry_put(tt_local);
827 if (tt_global)
828 batadv_tt_global_entry_put(tt_global);
829 return ret;
833 * batadv_tt_prepare_tvlv_global_data() - prepare the TVLV TT header to send
834 * within a TT Response directed to another node
835 * @orig_node: originator for which the TT data has to be prepared
836 * @tt_data: uninitialised pointer to the address of the TVLV buffer
837 * @tt_change: uninitialised pointer to the address of the area where the TT
838 * changed can be stored
839 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
840 * function reserves the amount of space needed to send the entire global TT
841 * table. In case of success the value is updated with the real amount of
842 * reserved bytes
843 * Allocate the needed amount of memory for the entire TT TVLV and write its
844 * header made up of one tvlv_tt_data object and a series of tvlv_tt_vlan_data
845 * objects, one per active VLAN served by the originator node.
847 * Return: the size of the allocated buffer or 0 in case of failure.
849 static u16
850 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
851 struct batadv_tvlv_tt_data **tt_data,
852 struct batadv_tvlv_tt_change **tt_change,
853 s32 *tt_len)
855 u16 num_vlan = 0;
856 u16 num_entries = 0;
857 u16 change_offset;
858 u16 tvlv_len;
859 struct batadv_tvlv_tt_vlan_data *tt_vlan;
860 struct batadv_orig_node_vlan *vlan;
861 u8 *tt_change_ptr;
863 spin_lock_bh(&orig_node->vlan_list_lock);
864 hlist_for_each_entry(vlan, &orig_node->vlan_list, list) {
865 num_vlan++;
866 num_entries += atomic_read(&vlan->tt.num_entries);
869 change_offset = sizeof(**tt_data);
870 change_offset += num_vlan * sizeof(*tt_vlan);
872 /* if tt_len is negative, allocate the space needed by the full table */
873 if (*tt_len < 0)
874 *tt_len = batadv_tt_len(num_entries);
876 tvlv_len = *tt_len;
877 tvlv_len += change_offset;
879 *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
880 if (!*tt_data) {
881 *tt_len = 0;
882 goto out;
885 (*tt_data)->flags = BATADV_NO_FLAGS;
886 (*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
887 (*tt_data)->num_vlan = htons(num_vlan);
889 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
890 hlist_for_each_entry(vlan, &orig_node->vlan_list, list) {
891 tt_vlan->vid = htons(vlan->vid);
892 tt_vlan->crc = htonl(vlan->tt.crc);
894 tt_vlan++;
897 tt_change_ptr = (u8 *)*tt_data + change_offset;
898 *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
900 out:
901 spin_unlock_bh(&orig_node->vlan_list_lock);
902 return tvlv_len;
906 * batadv_tt_prepare_tvlv_local_data() - allocate and prepare the TT TVLV for
907 * this node
908 * @bat_priv: the bat priv with all the soft interface information
909 * @tt_data: uninitialised pointer to the address of the TVLV buffer
910 * @tt_change: uninitialised pointer to the address of the area where the TT
911 * changes can be stored
912 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
913 * function reserves the amount of space needed to send the entire local TT
914 * table. In case of success the value is updated with the real amount of
915 * reserved bytes
917 * Allocate the needed amount of memory for the entire TT TVLV and write its
918 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
919 * objects, one per active VLAN.
921 * Return: the size of the allocated buffer or 0 in case of failure.
923 static u16
924 batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
925 struct batadv_tvlv_tt_data **tt_data,
926 struct batadv_tvlv_tt_change **tt_change,
927 s32 *tt_len)
929 struct batadv_tvlv_tt_vlan_data *tt_vlan;
930 struct batadv_softif_vlan *vlan;
931 u16 num_vlan = 0;
932 u16 vlan_entries = 0;
933 u16 total_entries = 0;
934 u16 tvlv_len;
935 u8 *tt_change_ptr;
936 int change_offset;
938 spin_lock_bh(&bat_priv->softif_vlan_list_lock);
939 hlist_for_each_entry(vlan, &bat_priv->softif_vlan_list, list) {
940 vlan_entries = atomic_read(&vlan->tt.num_entries);
941 if (vlan_entries < 1)
942 continue;
944 num_vlan++;
945 total_entries += vlan_entries;
948 change_offset = sizeof(**tt_data);
949 change_offset += num_vlan * sizeof(*tt_vlan);
951 /* if tt_len is negative, allocate the space needed by the full table */
952 if (*tt_len < 0)
953 *tt_len = batadv_tt_len(total_entries);
955 tvlv_len = *tt_len;
956 tvlv_len += change_offset;
958 *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
959 if (!*tt_data) {
960 tvlv_len = 0;
961 goto out;
964 (*tt_data)->flags = BATADV_NO_FLAGS;
965 (*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
966 (*tt_data)->num_vlan = htons(num_vlan);
968 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
969 hlist_for_each_entry(vlan, &bat_priv->softif_vlan_list, list) {
970 vlan_entries = atomic_read(&vlan->tt.num_entries);
971 if (vlan_entries < 1)
972 continue;
974 tt_vlan->vid = htons(vlan->vid);
975 tt_vlan->crc = htonl(vlan->tt.crc);
977 tt_vlan++;
980 tt_change_ptr = (u8 *)*tt_data + change_offset;
981 *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
983 out:
984 spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
985 return tvlv_len;
989 * batadv_tt_tvlv_container_update() - update the translation table tvlv
990 * container after local tt changes have been committed
991 * @bat_priv: the bat priv with all the soft interface information
993 static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
995 struct batadv_tt_change_node *entry, *safe;
996 struct batadv_tvlv_tt_data *tt_data;
997 struct batadv_tvlv_tt_change *tt_change;
998 int tt_diff_len, tt_change_len = 0;
999 int tt_diff_entries_num = 0;
1000 int tt_diff_entries_count = 0;
1001 u16 tvlv_len;
1003 tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
1004 tt_diff_len = batadv_tt_len(tt_diff_entries_num);
1006 /* if we have too many changes for one packet don't send any
1007 * and wait for the tt table request which will be fragmented
1009 if (tt_diff_len > bat_priv->soft_iface->mtu)
1010 tt_diff_len = 0;
1012 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
1013 &tt_change, &tt_diff_len);
1014 if (!tvlv_len)
1015 return;
1017 tt_data->flags = BATADV_TT_OGM_DIFF;
1019 if (tt_diff_len == 0)
1020 goto container_register;
1022 spin_lock_bh(&bat_priv->tt.changes_list_lock);
1023 atomic_set(&bat_priv->tt.local_changes, 0);
1025 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1026 list) {
1027 if (tt_diff_entries_count < tt_diff_entries_num) {
1028 memcpy(tt_change + tt_diff_entries_count,
1029 &entry->change,
1030 sizeof(struct batadv_tvlv_tt_change));
1031 tt_diff_entries_count++;
1033 list_del(&entry->list);
1034 kmem_cache_free(batadv_tt_change_cache, entry);
1036 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1038 /* Keep the buffer for possible tt_request */
1039 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
1040 kfree(bat_priv->tt.last_changeset);
1041 bat_priv->tt.last_changeset_len = 0;
1042 bat_priv->tt.last_changeset = NULL;
1043 tt_change_len = batadv_tt_len(tt_diff_entries_count);
1044 /* check whether this new OGM has no changes due to size problems */
1045 if (tt_diff_entries_count > 0) {
1046 /* if kmalloc() fails we will reply with the full table
1047 * instead of providing the diff
1049 bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
1050 if (bat_priv->tt.last_changeset) {
1051 memcpy(bat_priv->tt.last_changeset,
1052 tt_change, tt_change_len);
1053 bat_priv->tt.last_changeset_len = tt_diff_len;
1056 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
1058 container_register:
1059 batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
1060 tvlv_len);
1061 kfree(tt_data);
1065 * batadv_tt_local_dump_entry() - Dump one TT local entry into a message
1066 * @msg :Netlink message to dump into
1067 * @portid: Port making netlink request
1068 * @cb: Control block containing additional options
1069 * @bat_priv: The bat priv with all the soft interface information
1070 * @common: tt local & tt global common data
1072 * Return: Error code, or 0 on success
1074 static int
1075 batadv_tt_local_dump_entry(struct sk_buff *msg, u32 portid,
1076 struct netlink_callback *cb,
1077 struct batadv_priv *bat_priv,
1078 struct batadv_tt_common_entry *common)
1080 void *hdr;
1081 struct batadv_softif_vlan *vlan;
1082 struct batadv_tt_local_entry *local;
1083 unsigned int last_seen_msecs;
1084 u32 crc;
1086 local = container_of(common, struct batadv_tt_local_entry, common);
1087 last_seen_msecs = jiffies_to_msecs(jiffies - local->last_seen);
1089 vlan = batadv_softif_vlan_get(bat_priv, common->vid);
1090 if (!vlan)
1091 return 0;
1093 crc = vlan->tt.crc;
1095 batadv_softif_vlan_put(vlan);
1097 hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq,
1098 &batadv_netlink_family, NLM_F_MULTI,
1099 BATADV_CMD_GET_TRANSTABLE_LOCAL);
1100 if (!hdr)
1101 return -ENOBUFS;
1103 genl_dump_check_consistent(cb, hdr);
1105 if (nla_put(msg, BATADV_ATTR_TT_ADDRESS, ETH_ALEN, common->addr) ||
1106 nla_put_u32(msg, BATADV_ATTR_TT_CRC32, crc) ||
1107 nla_put_u16(msg, BATADV_ATTR_TT_VID, common->vid) ||
1108 nla_put_u32(msg, BATADV_ATTR_TT_FLAGS, common->flags))
1109 goto nla_put_failure;
1111 if (!(common->flags & BATADV_TT_CLIENT_NOPURGE) &&
1112 nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, last_seen_msecs))
1113 goto nla_put_failure;
1115 genlmsg_end(msg, hdr);
1116 return 0;
1118 nla_put_failure:
1119 genlmsg_cancel(msg, hdr);
1120 return -EMSGSIZE;
1124 * batadv_tt_local_dump_bucket() - Dump one TT local bucket into a message
1125 * @msg: Netlink message to dump into
1126 * @portid: Port making netlink request
1127 * @cb: Control block containing additional options
1128 * @bat_priv: The bat priv with all the soft interface information
1129 * @hash: hash to dump
1130 * @bucket: bucket index to dump
1131 * @idx_s: Number of entries to skip
1133 * Return: Error code, or 0 on success
1135 static int
1136 batadv_tt_local_dump_bucket(struct sk_buff *msg, u32 portid,
1137 struct netlink_callback *cb,
1138 struct batadv_priv *bat_priv,
1139 struct batadv_hashtable *hash, unsigned int bucket,
1140 int *idx_s)
1142 struct batadv_tt_common_entry *common;
1143 int idx = 0;
1145 spin_lock_bh(&hash->list_locks[bucket]);
1146 cb->seq = atomic_read(&hash->generation) << 1 | 1;
1148 hlist_for_each_entry(common, &hash->table[bucket], hash_entry) {
1149 if (idx++ < *idx_s)
1150 continue;
1152 if (batadv_tt_local_dump_entry(msg, portid, cb, bat_priv,
1153 common)) {
1154 spin_unlock_bh(&hash->list_locks[bucket]);
1155 *idx_s = idx - 1;
1156 return -EMSGSIZE;
1159 spin_unlock_bh(&hash->list_locks[bucket]);
1161 *idx_s = 0;
1162 return 0;
1166 * batadv_tt_local_dump() - Dump TT local entries into a message
1167 * @msg: Netlink message to dump into
1168 * @cb: Parameters from query
1170 * Return: Error code, or 0 on success
1172 int batadv_tt_local_dump(struct sk_buff *msg, struct netlink_callback *cb)
1174 struct net *net = sock_net(cb->skb->sk);
1175 struct net_device *soft_iface;
1176 struct batadv_priv *bat_priv;
1177 struct batadv_hard_iface *primary_if = NULL;
1178 struct batadv_hashtable *hash;
1179 int ret;
1180 int ifindex;
1181 int bucket = cb->args[0];
1182 int idx = cb->args[1];
1183 int portid = NETLINK_CB(cb->skb).portid;
1185 ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
1186 if (!ifindex)
1187 return -EINVAL;
1189 soft_iface = dev_get_by_index(net, ifindex);
1190 if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
1191 ret = -ENODEV;
1192 goto out;
1195 bat_priv = netdev_priv(soft_iface);
1197 primary_if = batadv_primary_if_get_selected(bat_priv);
1198 if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
1199 ret = -ENOENT;
1200 goto out;
1203 hash = bat_priv->tt.local_hash;
1205 while (bucket < hash->size) {
1206 if (batadv_tt_local_dump_bucket(msg, portid, cb, bat_priv,
1207 hash, bucket, &idx))
1208 break;
1210 bucket++;
1213 ret = msg->len;
1215 out:
1216 if (primary_if)
1217 batadv_hardif_put(primary_if);
1218 if (soft_iface)
1219 dev_put(soft_iface);
1221 cb->args[0] = bucket;
1222 cb->args[1] = idx;
1224 return ret;
1227 static void
1228 batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
1229 struct batadv_tt_local_entry *tt_local_entry,
1230 u16 flags, const char *message)
1232 batadv_tt_local_event(bat_priv, tt_local_entry, flags);
1234 /* The local client has to be marked as "pending to be removed" but has
1235 * to be kept in the table in order to send it in a full table
1236 * response issued before the net ttvn increment (consistency check)
1238 tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
1240 batadv_dbg(BATADV_DBG_TT, bat_priv,
1241 "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
1242 tt_local_entry->common.addr,
1243 batadv_print_vid(tt_local_entry->common.vid), message);
1247 * batadv_tt_local_remove() - logically remove an entry from the local table
1248 * @bat_priv: the bat priv with all the soft interface information
1249 * @addr: the MAC address of the client to remove
1250 * @vid: VLAN identifier
1251 * @message: message to append to the log on deletion
1252 * @roaming: true if the deletion is due to a roaming event
1254 * Return: the flags assigned to the local entry before being deleted
1256 u16 batadv_tt_local_remove(struct batadv_priv *bat_priv, const u8 *addr,
1257 unsigned short vid, const char *message,
1258 bool roaming)
1260 struct batadv_tt_local_entry *tt_removed_entry;
1261 struct batadv_tt_local_entry *tt_local_entry;
1262 u16 flags, curr_flags = BATADV_NO_FLAGS;
1263 struct hlist_node *tt_removed_node;
1265 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
1266 if (!tt_local_entry)
1267 goto out;
1269 curr_flags = tt_local_entry->common.flags;
1271 flags = BATADV_TT_CLIENT_DEL;
1272 /* if this global entry addition is due to a roaming, the node has to
1273 * mark the local entry as "roamed" in order to correctly reroute
1274 * packets later
1276 if (roaming) {
1277 flags |= BATADV_TT_CLIENT_ROAM;
1278 /* mark the local client as ROAMed */
1279 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1282 if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
1283 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
1284 message);
1285 goto out;
1287 /* if this client has been added right now, it is possible to
1288 * immediately purge it
1290 batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL);
1292 tt_removed_node = batadv_hash_remove(bat_priv->tt.local_hash,
1293 batadv_compare_tt,
1294 batadv_choose_tt,
1295 &tt_local_entry->common);
1296 if (!tt_removed_node)
1297 goto out;
1299 /* drop reference of remove hash entry */
1300 tt_removed_entry = hlist_entry(tt_removed_node,
1301 struct batadv_tt_local_entry,
1302 common.hash_entry);
1303 batadv_tt_local_entry_put(tt_removed_entry);
1305 out:
1306 if (tt_local_entry)
1307 batadv_tt_local_entry_put(tt_local_entry);
1309 return curr_flags;
1313 * batadv_tt_local_purge_list() - purge inactive tt local entries
1314 * @bat_priv: the bat priv with all the soft interface information
1315 * @head: pointer to the list containing the local tt entries
1316 * @timeout: parameter deciding whether a given tt local entry is considered
1317 * inactive or not
1319 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
1320 struct hlist_head *head,
1321 int timeout)
1323 struct batadv_tt_local_entry *tt_local_entry;
1324 struct batadv_tt_common_entry *tt_common_entry;
1325 struct hlist_node *node_tmp;
1327 hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
1328 hash_entry) {
1329 tt_local_entry = container_of(tt_common_entry,
1330 struct batadv_tt_local_entry,
1331 common);
1332 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
1333 continue;
1335 /* entry already marked for deletion */
1336 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
1337 continue;
1339 if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout))
1340 continue;
1342 batadv_tt_local_set_pending(bat_priv, tt_local_entry,
1343 BATADV_TT_CLIENT_DEL, "timed out");
1348 * batadv_tt_local_purge() - purge inactive tt local entries
1349 * @bat_priv: the bat priv with all the soft interface information
1350 * @timeout: parameter deciding whether a given tt local entry is considered
1351 * inactive or not
1353 static void batadv_tt_local_purge(struct batadv_priv *bat_priv,
1354 int timeout)
1356 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1357 struct hlist_head *head;
1358 spinlock_t *list_lock; /* protects write access to the hash lists */
1359 u32 i;
1361 for (i = 0; i < hash->size; i++) {
1362 head = &hash->table[i];
1363 list_lock = &hash->list_locks[i];
1365 spin_lock_bh(list_lock);
1366 batadv_tt_local_purge_list(bat_priv, head, timeout);
1367 spin_unlock_bh(list_lock);
1371 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
1373 struct batadv_hashtable *hash;
1374 spinlock_t *list_lock; /* protects write access to the hash lists */
1375 struct batadv_tt_common_entry *tt_common_entry;
1376 struct batadv_tt_local_entry *tt_local;
1377 struct hlist_node *node_tmp;
1378 struct hlist_head *head;
1379 u32 i;
1381 if (!bat_priv->tt.local_hash)
1382 return;
1384 hash = bat_priv->tt.local_hash;
1386 for (i = 0; i < hash->size; i++) {
1387 head = &hash->table[i];
1388 list_lock = &hash->list_locks[i];
1390 spin_lock_bh(list_lock);
1391 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1392 head, hash_entry) {
1393 hlist_del_rcu(&tt_common_entry->hash_entry);
1394 tt_local = container_of(tt_common_entry,
1395 struct batadv_tt_local_entry,
1396 common);
1398 batadv_tt_local_entry_put(tt_local);
1400 spin_unlock_bh(list_lock);
1403 batadv_hash_destroy(hash);
1405 bat_priv->tt.local_hash = NULL;
1408 static int batadv_tt_global_init(struct batadv_priv *bat_priv)
1410 if (bat_priv->tt.global_hash)
1411 return 0;
1413 bat_priv->tt.global_hash = batadv_hash_new(1024);
1415 if (!bat_priv->tt.global_hash)
1416 return -ENOMEM;
1418 batadv_hash_set_lock_class(bat_priv->tt.global_hash,
1419 &batadv_tt_global_hash_lock_class_key);
1421 return 0;
1424 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
1426 struct batadv_tt_change_node *entry, *safe;
1428 spin_lock_bh(&bat_priv->tt.changes_list_lock);
1430 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1431 list) {
1432 list_del(&entry->list);
1433 kmem_cache_free(batadv_tt_change_cache, entry);
1436 atomic_set(&bat_priv->tt.local_changes, 0);
1437 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1441 * batadv_tt_global_orig_entry_find() - find a TT orig_list_entry
1442 * @entry: the TT global entry where the orig_list_entry has to be
1443 * extracted from
1444 * @orig_node: the originator for which the orig_list_entry has to be found
1446 * retrieve the orig_tt_list_entry belonging to orig_node from the
1447 * batadv_tt_global_entry list
1449 * Return: it with an increased refcounter, NULL if not found
1451 static struct batadv_tt_orig_list_entry *
1452 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
1453 const struct batadv_orig_node *orig_node)
1455 struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
1456 const struct hlist_head *head;
1458 rcu_read_lock();
1459 head = &entry->orig_list;
1460 hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
1461 if (tmp_orig_entry->orig_node != orig_node)
1462 continue;
1463 if (!kref_get_unless_zero(&tmp_orig_entry->refcount))
1464 continue;
1466 orig_entry = tmp_orig_entry;
1467 break;
1469 rcu_read_unlock();
1471 return orig_entry;
1475 * batadv_tt_global_entry_has_orig() - check if a TT global entry is also
1476 * handled by a given originator
1477 * @entry: the TT global entry to check
1478 * @orig_node: the originator to search in the list
1479 * @flags: a pointer to store TT flags for the given @entry received
1480 * from @orig_node
1482 * find out if an orig_node is already in the list of a tt_global_entry.
1484 * Return: true if found, false otherwise
1486 static bool
1487 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
1488 const struct batadv_orig_node *orig_node,
1489 u8 *flags)
1491 struct batadv_tt_orig_list_entry *orig_entry;
1492 bool found = false;
1494 orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
1495 if (orig_entry) {
1496 found = true;
1498 if (flags)
1499 *flags = orig_entry->flags;
1501 batadv_tt_orig_list_entry_put(orig_entry);
1504 return found;
1508 * batadv_tt_global_sync_flags() - update TT sync flags
1509 * @tt_global: the TT global entry to update sync flags in
1511 * Updates the sync flag bits in the tt_global flag attribute with a logical
1512 * OR of all sync flags from any of its TT orig entries.
1514 static void
1515 batadv_tt_global_sync_flags(struct batadv_tt_global_entry *tt_global)
1517 struct batadv_tt_orig_list_entry *orig_entry;
1518 const struct hlist_head *head;
1519 u16 flags = BATADV_NO_FLAGS;
1521 rcu_read_lock();
1522 head = &tt_global->orig_list;
1523 hlist_for_each_entry_rcu(orig_entry, head, list)
1524 flags |= orig_entry->flags;
1525 rcu_read_unlock();
1527 flags |= tt_global->common.flags & (~BATADV_TT_SYNC_MASK);
1528 tt_global->common.flags = flags;
1532 * batadv_tt_global_orig_entry_add() - add or update a TT orig entry
1533 * @tt_global: the TT global entry to add an orig entry in
1534 * @orig_node: the originator to add an orig entry for
1535 * @ttvn: translation table version number of this changeset
1536 * @flags: TT sync flags
1538 static void
1539 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
1540 struct batadv_orig_node *orig_node, int ttvn,
1541 u8 flags)
1543 struct batadv_tt_orig_list_entry *orig_entry;
1545 spin_lock_bh(&tt_global->list_lock);
1547 orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
1548 if (orig_entry) {
1549 /* refresh the ttvn: the current value could be a bogus one that
1550 * was added during a "temporary client detection"
1552 orig_entry->ttvn = ttvn;
1553 orig_entry->flags = flags;
1554 goto sync_flags;
1557 orig_entry = kmem_cache_zalloc(batadv_tt_orig_cache, GFP_ATOMIC);
1558 if (!orig_entry)
1559 goto out;
1561 INIT_HLIST_NODE(&orig_entry->list);
1562 kref_get(&orig_node->refcount);
1563 batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
1564 orig_entry->orig_node = orig_node;
1565 orig_entry->ttvn = ttvn;
1566 orig_entry->flags = flags;
1567 kref_init(&orig_entry->refcount);
1569 kref_get(&orig_entry->refcount);
1570 hlist_add_head_rcu(&orig_entry->list,
1571 &tt_global->orig_list);
1572 atomic_inc(&tt_global->orig_list_count);
1574 sync_flags:
1575 batadv_tt_global_sync_flags(tt_global);
1576 out:
1577 if (orig_entry)
1578 batadv_tt_orig_list_entry_put(orig_entry);
1580 spin_unlock_bh(&tt_global->list_lock);
1584 * batadv_tt_global_add() - add a new TT global entry or update an existing one
1585 * @bat_priv: the bat priv with all the soft interface information
1586 * @orig_node: the originator announcing the client
1587 * @tt_addr: the mac address of the non-mesh client
1588 * @vid: VLAN identifier
1589 * @flags: TT flags that have to be set for this non-mesh client
1590 * @ttvn: the tt version number ever announcing this non-mesh client
1592 * Add a new TT global entry for the given originator. If the entry already
1593 * exists add a new reference to the given originator (a global entry can have
1594 * references to multiple originators) and adjust the flags attribute to reflect
1595 * the function argument.
1596 * If a TT local entry exists for this non-mesh client remove it.
1598 * The caller must hold the orig_node refcount.
1600 * Return: true if the new entry has been added, false otherwise
1602 static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
1603 struct batadv_orig_node *orig_node,
1604 const unsigned char *tt_addr,
1605 unsigned short vid, u16 flags, u8 ttvn)
1607 struct batadv_tt_global_entry *tt_global_entry;
1608 struct batadv_tt_local_entry *tt_local_entry;
1609 bool ret = false;
1610 int hash_added;
1611 struct batadv_tt_common_entry *common;
1612 u16 local_flags;
1614 /* ignore global entries from backbone nodes */
1615 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
1616 return true;
1618 tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
1619 tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
1621 /* if the node already has a local client for this entry, it has to wait
1622 * for a roaming advertisement instead of manually messing up the global
1623 * table
1625 if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
1626 !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
1627 goto out;
1629 if (!tt_global_entry) {
1630 tt_global_entry = kmem_cache_zalloc(batadv_tg_cache,
1631 GFP_ATOMIC);
1632 if (!tt_global_entry)
1633 goto out;
1635 common = &tt_global_entry->common;
1636 ether_addr_copy(common->addr, tt_addr);
1637 common->vid = vid;
1639 if (!is_multicast_ether_addr(common->addr))
1640 common->flags = flags & (~BATADV_TT_SYNC_MASK);
1642 tt_global_entry->roam_at = 0;
1643 /* node must store current time in case of roaming. This is
1644 * needed to purge this entry out on timeout (if nobody claims
1645 * it)
1647 if (flags & BATADV_TT_CLIENT_ROAM)
1648 tt_global_entry->roam_at = jiffies;
1649 kref_init(&common->refcount);
1650 common->added_at = jiffies;
1652 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
1653 atomic_set(&tt_global_entry->orig_list_count, 0);
1654 spin_lock_init(&tt_global_entry->list_lock);
1656 kref_get(&common->refcount);
1657 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
1658 batadv_compare_tt,
1659 batadv_choose_tt, common,
1660 &common->hash_entry);
1662 if (unlikely(hash_added != 0)) {
1663 /* remove the reference for the hash */
1664 batadv_tt_global_entry_put(tt_global_entry);
1665 goto out_remove;
1667 } else {
1668 common = &tt_global_entry->common;
1669 /* If there is already a global entry, we can use this one for
1670 * our processing.
1671 * But if we are trying to add a temporary client then here are
1672 * two options at this point:
1673 * 1) the global client is not a temporary client: the global
1674 * client has to be left as it is, temporary information
1675 * should never override any already known client state
1676 * 2) the global client is a temporary client: purge the
1677 * originator list and add the new one orig_entry
1679 if (flags & BATADV_TT_CLIENT_TEMP) {
1680 if (!(common->flags & BATADV_TT_CLIENT_TEMP))
1681 goto out;
1682 if (batadv_tt_global_entry_has_orig(tt_global_entry,
1683 orig_node, NULL))
1684 goto out_remove;
1685 batadv_tt_global_del_orig_list(tt_global_entry);
1686 goto add_orig_entry;
1689 /* if the client was temporary added before receiving the first
1690 * OGM announcing it, we have to clear the TEMP flag. Also,
1691 * remove the previous temporary orig node and re-add it
1692 * if required. If the orig entry changed, the new one which
1693 * is a non-temporary entry is preferred.
1695 if (common->flags & BATADV_TT_CLIENT_TEMP) {
1696 batadv_tt_global_del_orig_list(tt_global_entry);
1697 common->flags &= ~BATADV_TT_CLIENT_TEMP;
1700 /* the change can carry possible "attribute" flags like the
1701 * TT_CLIENT_TEMP, therefore they have to be copied in the
1702 * client entry
1704 if (!is_multicast_ether_addr(common->addr))
1705 common->flags |= flags & (~BATADV_TT_SYNC_MASK);
1707 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1708 * one originator left in the list and we previously received a
1709 * delete + roaming change for this originator.
1711 * We should first delete the old originator before adding the
1712 * new one.
1714 if (common->flags & BATADV_TT_CLIENT_ROAM) {
1715 batadv_tt_global_del_orig_list(tt_global_entry);
1716 common->flags &= ~BATADV_TT_CLIENT_ROAM;
1717 tt_global_entry->roam_at = 0;
1720 add_orig_entry:
1721 /* add the new orig_entry (if needed) or update it */
1722 batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn,
1723 flags & BATADV_TT_SYNC_MASK);
1725 batadv_dbg(BATADV_DBG_TT, bat_priv,
1726 "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1727 common->addr, batadv_print_vid(common->vid),
1728 orig_node->orig);
1729 ret = true;
1731 out_remove:
1732 /* Do not remove multicast addresses from the local hash on
1733 * global additions
1735 if (is_multicast_ether_addr(tt_addr))
1736 goto out;
1738 /* remove address from local hash if present */
1739 local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
1740 "global tt received",
1741 flags & BATADV_TT_CLIENT_ROAM);
1742 tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
1744 if (!(flags & BATADV_TT_CLIENT_ROAM))
1745 /* this is a normal global add. Therefore the client is not in a
1746 * roaming state anymore.
1748 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
1750 out:
1751 if (tt_global_entry)
1752 batadv_tt_global_entry_put(tt_global_entry);
1753 if (tt_local_entry)
1754 batadv_tt_local_entry_put(tt_local_entry);
1755 return ret;
1759 * batadv_transtable_best_orig() - Get best originator list entry from tt entry
1760 * @bat_priv: the bat priv with all the soft interface information
1761 * @tt_global_entry: global translation table entry to be analyzed
1763 * This function assumes the caller holds rcu_read_lock().
1764 * Return: best originator list entry or NULL on errors.
1766 static struct batadv_tt_orig_list_entry *
1767 batadv_transtable_best_orig(struct batadv_priv *bat_priv,
1768 struct batadv_tt_global_entry *tt_global_entry)
1770 struct batadv_neigh_node *router, *best_router = NULL;
1771 struct batadv_algo_ops *bao = bat_priv->algo_ops;
1772 struct hlist_head *head;
1773 struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
1775 head = &tt_global_entry->orig_list;
1776 hlist_for_each_entry_rcu(orig_entry, head, list) {
1777 router = batadv_orig_router_get(orig_entry->orig_node,
1778 BATADV_IF_DEFAULT);
1779 if (!router)
1780 continue;
1782 if (best_router &&
1783 bao->neigh.cmp(router, BATADV_IF_DEFAULT, best_router,
1784 BATADV_IF_DEFAULT) <= 0) {
1785 batadv_neigh_node_put(router);
1786 continue;
1789 /* release the refcount for the "old" best */
1790 if (best_router)
1791 batadv_neigh_node_put(best_router);
1793 best_entry = orig_entry;
1794 best_router = router;
1797 if (best_router)
1798 batadv_neigh_node_put(best_router);
1800 return best_entry;
1804 * batadv_tt_global_dump_subentry() - Dump all TT local entries into a message
1805 * @msg: Netlink message to dump into
1806 * @portid: Port making netlink request
1807 * @seq: Sequence number of netlink message
1808 * @common: tt local & tt global common data
1809 * @orig: Originator node announcing a non-mesh client
1810 * @best: Is the best originator for the TT entry
1812 * Return: Error code, or 0 on success
1814 static int
1815 batadv_tt_global_dump_subentry(struct sk_buff *msg, u32 portid, u32 seq,
1816 struct batadv_tt_common_entry *common,
1817 struct batadv_tt_orig_list_entry *orig,
1818 bool best)
1820 u16 flags = (common->flags & (~BATADV_TT_SYNC_MASK)) | orig->flags;
1821 void *hdr;
1822 struct batadv_orig_node_vlan *vlan;
1823 u8 last_ttvn;
1824 u32 crc;
1826 vlan = batadv_orig_node_vlan_get(orig->orig_node,
1827 common->vid);
1828 if (!vlan)
1829 return 0;
1831 crc = vlan->tt.crc;
1833 batadv_orig_node_vlan_put(vlan);
1835 hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
1836 NLM_F_MULTI,
1837 BATADV_CMD_GET_TRANSTABLE_GLOBAL);
1838 if (!hdr)
1839 return -ENOBUFS;
1841 last_ttvn = atomic_read(&orig->orig_node->last_ttvn);
1843 if (nla_put(msg, BATADV_ATTR_TT_ADDRESS, ETH_ALEN, common->addr) ||
1844 nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,
1845 orig->orig_node->orig) ||
1846 nla_put_u8(msg, BATADV_ATTR_TT_TTVN, orig->ttvn) ||
1847 nla_put_u8(msg, BATADV_ATTR_TT_LAST_TTVN, last_ttvn) ||
1848 nla_put_u32(msg, BATADV_ATTR_TT_CRC32, crc) ||
1849 nla_put_u16(msg, BATADV_ATTR_TT_VID, common->vid) ||
1850 nla_put_u32(msg, BATADV_ATTR_TT_FLAGS, flags))
1851 goto nla_put_failure;
1853 if (best && nla_put_flag(msg, BATADV_ATTR_FLAG_BEST))
1854 goto nla_put_failure;
1856 genlmsg_end(msg, hdr);
1857 return 0;
1859 nla_put_failure:
1860 genlmsg_cancel(msg, hdr);
1861 return -EMSGSIZE;
1865 * batadv_tt_global_dump_entry() - Dump one TT global entry into a message
1866 * @msg: Netlink message to dump into
1867 * @portid: Port making netlink request
1868 * @seq: Sequence number of netlink message
1869 * @bat_priv: The bat priv with all the soft interface information
1870 * @common: tt local & tt global common data
1871 * @sub_s: Number of entries to skip
1873 * This function assumes the caller holds rcu_read_lock().
1875 * Return: Error code, or 0 on success
1877 static int
1878 batadv_tt_global_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
1879 struct batadv_priv *bat_priv,
1880 struct batadv_tt_common_entry *common, int *sub_s)
1882 struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
1883 struct batadv_tt_global_entry *global;
1884 struct hlist_head *head;
1885 int sub = 0;
1886 bool best;
1888 global = container_of(common, struct batadv_tt_global_entry, common);
1889 best_entry = batadv_transtable_best_orig(bat_priv, global);
1890 head = &global->orig_list;
1892 hlist_for_each_entry_rcu(orig_entry, head, list) {
1893 if (sub++ < *sub_s)
1894 continue;
1896 best = (orig_entry == best_entry);
1898 if (batadv_tt_global_dump_subentry(msg, portid, seq, common,
1899 orig_entry, best)) {
1900 *sub_s = sub - 1;
1901 return -EMSGSIZE;
1905 *sub_s = 0;
1906 return 0;
1910 * batadv_tt_global_dump_bucket() - Dump one TT local bucket into a message
1911 * @msg: Netlink message to dump into
1912 * @portid: Port making netlink request
1913 * @seq: Sequence number of netlink message
1914 * @bat_priv: The bat priv with all the soft interface information
1915 * @head: Pointer to the list containing the global tt entries
1916 * @idx_s: Number of entries to skip
1917 * @sub: Number of entries to skip
1919 * Return: Error code, or 0 on success
1921 static int
1922 batadv_tt_global_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
1923 struct batadv_priv *bat_priv,
1924 struct hlist_head *head, int *idx_s, int *sub)
1926 struct batadv_tt_common_entry *common;
1927 int idx = 0;
1929 rcu_read_lock();
1930 hlist_for_each_entry_rcu(common, head, hash_entry) {
1931 if (idx++ < *idx_s)
1932 continue;
1934 if (batadv_tt_global_dump_entry(msg, portid, seq, bat_priv,
1935 common, sub)) {
1936 rcu_read_unlock();
1937 *idx_s = idx - 1;
1938 return -EMSGSIZE;
1941 rcu_read_unlock();
1943 *idx_s = 0;
1944 *sub = 0;
1945 return 0;
1949 * batadv_tt_global_dump() - Dump TT global entries into a message
1950 * @msg: Netlink message to dump into
1951 * @cb: Parameters from query
1953 * Return: Error code, or length of message on success
1955 int batadv_tt_global_dump(struct sk_buff *msg, struct netlink_callback *cb)
1957 struct net *net = sock_net(cb->skb->sk);
1958 struct net_device *soft_iface;
1959 struct batadv_priv *bat_priv;
1960 struct batadv_hard_iface *primary_if = NULL;
1961 struct batadv_hashtable *hash;
1962 struct hlist_head *head;
1963 int ret;
1964 int ifindex;
1965 int bucket = cb->args[0];
1966 int idx = cb->args[1];
1967 int sub = cb->args[2];
1968 int portid = NETLINK_CB(cb->skb).portid;
1970 ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
1971 if (!ifindex)
1972 return -EINVAL;
1974 soft_iface = dev_get_by_index(net, ifindex);
1975 if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
1976 ret = -ENODEV;
1977 goto out;
1980 bat_priv = netdev_priv(soft_iface);
1982 primary_if = batadv_primary_if_get_selected(bat_priv);
1983 if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
1984 ret = -ENOENT;
1985 goto out;
1988 hash = bat_priv->tt.global_hash;
1990 while (bucket < hash->size) {
1991 head = &hash->table[bucket];
1993 if (batadv_tt_global_dump_bucket(msg, portid,
1994 cb->nlh->nlmsg_seq, bat_priv,
1995 head, &idx, &sub))
1996 break;
1998 bucket++;
2001 ret = msg->len;
2003 out:
2004 if (primary_if)
2005 batadv_hardif_put(primary_if);
2006 if (soft_iface)
2007 dev_put(soft_iface);
2009 cb->args[0] = bucket;
2010 cb->args[1] = idx;
2011 cb->args[2] = sub;
2013 return ret;
2017 * _batadv_tt_global_del_orig_entry() - remove and free an orig_entry
2018 * @tt_global_entry: the global entry to remove the orig_entry from
2019 * @orig_entry: the orig entry to remove and free
2021 * Remove an orig_entry from its list in the given tt_global_entry and
2022 * free this orig_entry afterwards.
2024 * Caller must hold tt_global_entry->list_lock and ensure orig_entry->list is
2025 * part of a list.
2027 static void
2028 _batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
2029 struct batadv_tt_orig_list_entry *orig_entry)
2031 lockdep_assert_held(&tt_global_entry->list_lock);
2033 batadv_tt_global_size_dec(orig_entry->orig_node,
2034 tt_global_entry->common.vid);
2035 atomic_dec(&tt_global_entry->orig_list_count);
2036 /* requires holding tt_global_entry->list_lock and orig_entry->list
2037 * being part of a list
2039 hlist_del_rcu(&orig_entry->list);
2040 batadv_tt_orig_list_entry_put(orig_entry);
2043 /* deletes the orig list of a tt_global_entry */
2044 static void
2045 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
2047 struct hlist_head *head;
2048 struct hlist_node *safe;
2049 struct batadv_tt_orig_list_entry *orig_entry;
2051 spin_lock_bh(&tt_global_entry->list_lock);
2052 head = &tt_global_entry->orig_list;
2053 hlist_for_each_entry_safe(orig_entry, safe, head, list)
2054 _batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
2055 spin_unlock_bh(&tt_global_entry->list_lock);
2059 * batadv_tt_global_del_orig_node() - remove orig_node from a global tt entry
2060 * @bat_priv: the bat priv with all the soft interface information
2061 * @tt_global_entry: the global entry to remove the orig_node from
2062 * @orig_node: the originator announcing the client
2063 * @message: message to append to the log on deletion
2065 * Remove the given orig_node and its according orig_entry from the given
2066 * global tt entry.
2068 static void
2069 batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
2070 struct batadv_tt_global_entry *tt_global_entry,
2071 struct batadv_orig_node *orig_node,
2072 const char *message)
2074 struct hlist_head *head;
2075 struct hlist_node *safe;
2076 struct batadv_tt_orig_list_entry *orig_entry;
2077 unsigned short vid;
2079 spin_lock_bh(&tt_global_entry->list_lock);
2080 head = &tt_global_entry->orig_list;
2081 hlist_for_each_entry_safe(orig_entry, safe, head, list) {
2082 if (orig_entry->orig_node == orig_node) {
2083 vid = tt_global_entry->common.vid;
2084 batadv_dbg(BATADV_DBG_TT, bat_priv,
2085 "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
2086 orig_node->orig,
2087 tt_global_entry->common.addr,
2088 batadv_print_vid(vid), message);
2089 _batadv_tt_global_del_orig_entry(tt_global_entry,
2090 orig_entry);
2093 spin_unlock_bh(&tt_global_entry->list_lock);
2096 /* If the client is to be deleted, we check if it is the last origantor entry
2097 * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
2098 * timer, otherwise we simply remove the originator scheduled for deletion.
2100 static void
2101 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
2102 struct batadv_tt_global_entry *tt_global_entry,
2103 struct batadv_orig_node *orig_node,
2104 const char *message)
2106 bool last_entry = true;
2107 struct hlist_head *head;
2108 struct batadv_tt_orig_list_entry *orig_entry;
2110 /* no local entry exists, case 1:
2111 * Check if this is the last one or if other entries exist.
2114 rcu_read_lock();
2115 head = &tt_global_entry->orig_list;
2116 hlist_for_each_entry_rcu(orig_entry, head, list) {
2117 if (orig_entry->orig_node != orig_node) {
2118 last_entry = false;
2119 break;
2122 rcu_read_unlock();
2124 if (last_entry) {
2125 /* its the last one, mark for roaming. */
2126 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
2127 tt_global_entry->roam_at = jiffies;
2128 } else {
2129 /* there is another entry, we can simply delete this
2130 * one and can still use the other one.
2132 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
2133 orig_node, message);
2138 * batadv_tt_global_del() - remove a client from the global table
2139 * @bat_priv: the bat priv with all the soft interface information
2140 * @orig_node: an originator serving this client
2141 * @addr: the mac address of the client
2142 * @vid: VLAN identifier
2143 * @message: a message explaining the reason for deleting the client to print
2144 * for debugging purpose
2145 * @roaming: true if the deletion has been triggered by a roaming event
2147 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
2148 struct batadv_orig_node *orig_node,
2149 const unsigned char *addr, unsigned short vid,
2150 const char *message, bool roaming)
2152 struct batadv_tt_global_entry *tt_global_entry;
2153 struct batadv_tt_local_entry *local_entry = NULL;
2155 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
2156 if (!tt_global_entry)
2157 goto out;
2159 if (!roaming) {
2160 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
2161 orig_node, message);
2163 if (hlist_empty(&tt_global_entry->orig_list))
2164 batadv_tt_global_free(bat_priv, tt_global_entry,
2165 message);
2167 goto out;
2170 /* if we are deleting a global entry due to a roam
2171 * event, there are two possibilities:
2172 * 1) the client roamed from node A to node B => if there
2173 * is only one originator left for this client, we mark
2174 * it with BATADV_TT_CLIENT_ROAM, we start a timer and we
2175 * wait for node B to claim it. In case of timeout
2176 * the entry is purged.
2178 * If there are other originators left, we directly delete
2179 * the originator.
2180 * 2) the client roamed to us => we can directly delete
2181 * the global entry, since it is useless now.
2183 local_entry = batadv_tt_local_hash_find(bat_priv,
2184 tt_global_entry->common.addr,
2185 vid);
2186 if (local_entry) {
2187 /* local entry exists, case 2: client roamed to us. */
2188 batadv_tt_global_del_orig_list(tt_global_entry);
2189 batadv_tt_global_free(bat_priv, tt_global_entry, message);
2190 } else {
2191 /* no local entry exists, case 1: check for roaming */
2192 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
2193 orig_node, message);
2196 out:
2197 if (tt_global_entry)
2198 batadv_tt_global_entry_put(tt_global_entry);
2199 if (local_entry)
2200 batadv_tt_local_entry_put(local_entry);
2204 * batadv_tt_global_del_orig() - remove all the TT global entries belonging to
2205 * the given originator matching the provided vid
2206 * @bat_priv: the bat priv with all the soft interface information
2207 * @orig_node: the originator owning the entries to remove
2208 * @match_vid: the VLAN identifier to match. If negative all the entries will be
2209 * removed
2210 * @message: debug message to print as "reason"
2212 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
2213 struct batadv_orig_node *orig_node,
2214 s32 match_vid,
2215 const char *message)
2217 struct batadv_tt_global_entry *tt_global;
2218 struct batadv_tt_common_entry *tt_common_entry;
2219 u32 i;
2220 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2221 struct hlist_node *safe;
2222 struct hlist_head *head;
2223 spinlock_t *list_lock; /* protects write access to the hash lists */
2224 unsigned short vid;
2226 if (!hash)
2227 return;
2229 for (i = 0; i < hash->size; i++) {
2230 head = &hash->table[i];
2231 list_lock = &hash->list_locks[i];
2233 spin_lock_bh(list_lock);
2234 hlist_for_each_entry_safe(tt_common_entry, safe,
2235 head, hash_entry) {
2236 /* remove only matching entries */
2237 if (match_vid >= 0 && tt_common_entry->vid != match_vid)
2238 continue;
2240 tt_global = container_of(tt_common_entry,
2241 struct batadv_tt_global_entry,
2242 common);
2244 batadv_tt_global_del_orig_node(bat_priv, tt_global,
2245 orig_node, message);
2247 if (hlist_empty(&tt_global->orig_list)) {
2248 vid = tt_global->common.vid;
2249 batadv_dbg(BATADV_DBG_TT, bat_priv,
2250 "Deleting global tt entry %pM (vid: %d): %s\n",
2251 tt_global->common.addr,
2252 batadv_print_vid(vid), message);
2253 hlist_del_rcu(&tt_common_entry->hash_entry);
2254 batadv_tt_global_entry_put(tt_global);
2257 spin_unlock_bh(list_lock);
2259 clear_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
2262 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
2263 char **msg)
2265 bool purge = false;
2266 unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
2267 unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
2269 if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
2270 batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
2271 purge = true;
2272 *msg = "Roaming timeout\n";
2275 if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
2276 batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
2277 purge = true;
2278 *msg = "Temporary client timeout\n";
2281 return purge;
2284 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
2286 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2287 struct hlist_head *head;
2288 struct hlist_node *node_tmp;
2289 spinlock_t *list_lock; /* protects write access to the hash lists */
2290 u32 i;
2291 char *msg = NULL;
2292 struct batadv_tt_common_entry *tt_common;
2293 struct batadv_tt_global_entry *tt_global;
2295 for (i = 0; i < hash->size; i++) {
2296 head = &hash->table[i];
2297 list_lock = &hash->list_locks[i];
2299 spin_lock_bh(list_lock);
2300 hlist_for_each_entry_safe(tt_common, node_tmp, head,
2301 hash_entry) {
2302 tt_global = container_of(tt_common,
2303 struct batadv_tt_global_entry,
2304 common);
2306 if (!batadv_tt_global_to_purge(tt_global, &msg))
2307 continue;
2309 batadv_dbg(BATADV_DBG_TT, bat_priv,
2310 "Deleting global tt entry %pM (vid: %d): %s\n",
2311 tt_global->common.addr,
2312 batadv_print_vid(tt_global->common.vid),
2313 msg);
2315 hlist_del_rcu(&tt_common->hash_entry);
2317 batadv_tt_global_entry_put(tt_global);
2319 spin_unlock_bh(list_lock);
2323 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
2325 struct batadv_hashtable *hash;
2326 spinlock_t *list_lock; /* protects write access to the hash lists */
2327 struct batadv_tt_common_entry *tt_common_entry;
2328 struct batadv_tt_global_entry *tt_global;
2329 struct hlist_node *node_tmp;
2330 struct hlist_head *head;
2331 u32 i;
2333 if (!bat_priv->tt.global_hash)
2334 return;
2336 hash = bat_priv->tt.global_hash;
2338 for (i = 0; i < hash->size; i++) {
2339 head = &hash->table[i];
2340 list_lock = &hash->list_locks[i];
2342 spin_lock_bh(list_lock);
2343 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
2344 head, hash_entry) {
2345 hlist_del_rcu(&tt_common_entry->hash_entry);
2346 tt_global = container_of(tt_common_entry,
2347 struct batadv_tt_global_entry,
2348 common);
2349 batadv_tt_global_entry_put(tt_global);
2351 spin_unlock_bh(list_lock);
2354 batadv_hash_destroy(hash);
2356 bat_priv->tt.global_hash = NULL;
2359 static bool
2360 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
2361 struct batadv_tt_global_entry *tt_global_entry)
2363 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
2364 tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
2365 return true;
2367 /* check if the two clients are marked as isolated */
2368 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
2369 tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
2370 return true;
2372 return false;
2376 * batadv_transtable_search() - get the mesh destination for a given client
2377 * @bat_priv: the bat priv with all the soft interface information
2378 * @src: mac address of the source client
2379 * @addr: mac address of the destination client
2380 * @vid: VLAN identifier
2382 * Return: a pointer to the originator that was selected as destination in the
2383 * mesh for contacting the client 'addr', NULL otherwise.
2384 * In case of multiple originators serving the same client, the function returns
2385 * the best one (best in terms of metric towards the destination node).
2387 * If the two clients are AP isolated the function returns NULL.
2389 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
2390 const u8 *src,
2391 const u8 *addr,
2392 unsigned short vid)
2394 struct batadv_tt_local_entry *tt_local_entry = NULL;
2395 struct batadv_tt_global_entry *tt_global_entry = NULL;
2396 struct batadv_orig_node *orig_node = NULL;
2397 struct batadv_tt_orig_list_entry *best_entry;
2399 if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) {
2400 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
2401 if (!tt_local_entry ||
2402 (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
2403 goto out;
2406 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
2407 if (!tt_global_entry)
2408 goto out;
2410 /* check whether the clients should not communicate due to AP
2411 * isolation
2413 if (tt_local_entry &&
2414 _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
2415 goto out;
2417 rcu_read_lock();
2418 best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
2419 /* found anything? */
2420 if (best_entry)
2421 orig_node = best_entry->orig_node;
2422 if (orig_node && !kref_get_unless_zero(&orig_node->refcount))
2423 orig_node = NULL;
2424 rcu_read_unlock();
2426 out:
2427 if (tt_global_entry)
2428 batadv_tt_global_entry_put(tt_global_entry);
2429 if (tt_local_entry)
2430 batadv_tt_local_entry_put(tt_local_entry);
2432 return orig_node;
2436 * batadv_tt_global_crc() - calculates the checksum of the local table belonging
2437 * to the given orig_node
2438 * @bat_priv: the bat priv with all the soft interface information
2439 * @orig_node: originator for which the CRC should be computed
2440 * @vid: VLAN identifier for which the CRC32 has to be computed
2442 * This function computes the checksum for the global table corresponding to a
2443 * specific originator. In particular, the checksum is computed as follows: For
2444 * each client connected to the originator the CRC32C of the MAC address and the
2445 * VID is computed and then all the CRC32Cs of the various clients are xor'ed
2446 * together.
2448 * The idea behind is that CRC32C should be used as much as possible in order to
2449 * produce a unique hash of the table, but since the order which is used to feed
2450 * the CRC32C function affects the result and since every node in the network
2451 * probably sorts the clients differently, the hash function cannot be directly
2452 * computed over the entire table. Hence the CRC32C is used only on
2453 * the single client entry, while all the results are then xor'ed together
2454 * because the XOR operation can combine them all while trying to reduce the
2455 * noise as much as possible.
2457 * Return: the checksum of the global table of a given originator.
2459 static u32 batadv_tt_global_crc(struct batadv_priv *bat_priv,
2460 struct batadv_orig_node *orig_node,
2461 unsigned short vid)
2463 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2464 struct batadv_tt_orig_list_entry *tt_orig;
2465 struct batadv_tt_common_entry *tt_common;
2466 struct batadv_tt_global_entry *tt_global;
2467 struct hlist_head *head;
2468 u32 i, crc_tmp, crc = 0;
2469 u8 flags;
2470 __be16 tmp_vid;
2472 for (i = 0; i < hash->size; i++) {
2473 head = &hash->table[i];
2475 rcu_read_lock();
2476 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2477 tt_global = container_of(tt_common,
2478 struct batadv_tt_global_entry,
2479 common);
2480 /* compute the CRC only for entries belonging to the
2481 * VLAN identified by the vid passed as parameter
2483 if (tt_common->vid != vid)
2484 continue;
2486 /* Roaming clients are in the global table for
2487 * consistency only. They don't have to be
2488 * taken into account while computing the
2489 * global crc
2491 if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
2492 continue;
2493 /* Temporary clients have not been announced yet, so
2494 * they have to be skipped while computing the global
2495 * crc
2497 if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
2498 continue;
2500 /* find out if this global entry is announced by this
2501 * originator
2503 tt_orig = batadv_tt_global_orig_entry_find(tt_global,
2504 orig_node);
2505 if (!tt_orig)
2506 continue;
2508 /* use network order to read the VID: this ensures that
2509 * every node reads the bytes in the same order.
2511 tmp_vid = htons(tt_common->vid);
2512 crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2514 /* compute the CRC on flags that have to be kept in sync
2515 * among nodes
2517 flags = tt_orig->flags;
2518 crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2520 crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2522 batadv_tt_orig_list_entry_put(tt_orig);
2524 rcu_read_unlock();
2527 return crc;
2531 * batadv_tt_local_crc() - calculates the checksum of the local table
2532 * @bat_priv: the bat priv with all the soft interface information
2533 * @vid: VLAN identifier for which the CRC32 has to be computed
2535 * For details about the computation, please refer to the documentation for
2536 * batadv_tt_global_crc().
2538 * Return: the checksum of the local table
2540 static u32 batadv_tt_local_crc(struct batadv_priv *bat_priv,
2541 unsigned short vid)
2543 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2544 struct batadv_tt_common_entry *tt_common;
2545 struct hlist_head *head;
2546 u32 i, crc_tmp, crc = 0;
2547 u8 flags;
2548 __be16 tmp_vid;
2550 for (i = 0; i < hash->size; i++) {
2551 head = &hash->table[i];
2553 rcu_read_lock();
2554 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2555 /* compute the CRC only for entries belonging to the
2556 * VLAN identified by vid
2558 if (tt_common->vid != vid)
2559 continue;
2561 /* not yet committed clients have not to be taken into
2562 * account while computing the CRC
2564 if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2565 continue;
2567 /* use network order to read the VID: this ensures that
2568 * every node reads the bytes in the same order.
2570 tmp_vid = htons(tt_common->vid);
2571 crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2573 /* compute the CRC on flags that have to be kept in sync
2574 * among nodes
2576 flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2577 crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2579 crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2581 rcu_read_unlock();
2584 return crc;
2588 * batadv_tt_req_node_release() - free tt_req node entry
2589 * @ref: kref pointer of the tt req_node entry
2591 static void batadv_tt_req_node_release(struct kref *ref)
2593 struct batadv_tt_req_node *tt_req_node;
2595 tt_req_node = container_of(ref, struct batadv_tt_req_node, refcount);
2597 kmem_cache_free(batadv_tt_req_cache, tt_req_node);
2601 * batadv_tt_req_node_put() - decrement the tt_req_node refcounter and
2602 * possibly release it
2603 * @tt_req_node: tt_req_node to be free'd
2605 static void batadv_tt_req_node_put(struct batadv_tt_req_node *tt_req_node)
2607 kref_put(&tt_req_node->refcount, batadv_tt_req_node_release);
2610 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2612 struct batadv_tt_req_node *node;
2613 struct hlist_node *safe;
2615 spin_lock_bh(&bat_priv->tt.req_list_lock);
2617 hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2618 hlist_del_init(&node->list);
2619 batadv_tt_req_node_put(node);
2622 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2625 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2626 struct batadv_orig_node *orig_node,
2627 const void *tt_buff,
2628 u16 tt_buff_len)
2630 /* Replace the old buffer only if I received something in the
2631 * last OGM (the OGM could carry no changes)
2633 spin_lock_bh(&orig_node->tt_buff_lock);
2634 if (tt_buff_len > 0) {
2635 kfree(orig_node->tt_buff);
2636 orig_node->tt_buff_len = 0;
2637 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2638 if (orig_node->tt_buff) {
2639 memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2640 orig_node->tt_buff_len = tt_buff_len;
2643 spin_unlock_bh(&orig_node->tt_buff_lock);
2646 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2648 struct batadv_tt_req_node *node;
2649 struct hlist_node *safe;
2651 spin_lock_bh(&bat_priv->tt.req_list_lock);
2652 hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2653 if (batadv_has_timed_out(node->issued_at,
2654 BATADV_TT_REQUEST_TIMEOUT)) {
2655 hlist_del_init(&node->list);
2656 batadv_tt_req_node_put(node);
2659 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2663 * batadv_tt_req_node_new() - search and possibly create a tt_req_node object
2664 * @bat_priv: the bat priv with all the soft interface information
2665 * @orig_node: orig node this request is being issued for
2667 * Return: the pointer to the new tt_req_node struct if no request
2668 * has already been issued for this orig_node, NULL otherwise.
2670 static struct batadv_tt_req_node *
2671 batadv_tt_req_node_new(struct batadv_priv *bat_priv,
2672 struct batadv_orig_node *orig_node)
2674 struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2676 spin_lock_bh(&bat_priv->tt.req_list_lock);
2677 hlist_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2678 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2679 !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2680 BATADV_TT_REQUEST_TIMEOUT))
2681 goto unlock;
2684 tt_req_node = kmem_cache_alloc(batadv_tt_req_cache, GFP_ATOMIC);
2685 if (!tt_req_node)
2686 goto unlock;
2688 kref_init(&tt_req_node->refcount);
2689 ether_addr_copy(tt_req_node->addr, orig_node->orig);
2690 tt_req_node->issued_at = jiffies;
2692 kref_get(&tt_req_node->refcount);
2693 hlist_add_head(&tt_req_node->list, &bat_priv->tt.req_list);
2694 unlock:
2695 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2696 return tt_req_node;
2700 * batadv_tt_local_valid() - verify local tt entry and get flags
2701 * @entry_ptr: to be checked local tt entry
2702 * @data_ptr: not used but definition required to satisfy the callback prototype
2703 * @flags: a pointer to store TT flags for this client to
2705 * Checks the validity of the given local TT entry. If it is, then the provided
2706 * flags pointer is updated.
2708 * Return: true if the entry is a valid, false otherwise.
2710 static bool batadv_tt_local_valid(const void *entry_ptr,
2711 const void *data_ptr,
2712 u8 *flags)
2714 const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2716 if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2717 return false;
2719 if (flags)
2720 *flags = tt_common_entry->flags;
2722 return true;
2726 * batadv_tt_global_valid() - verify global tt entry and get flags
2727 * @entry_ptr: to be checked global tt entry
2728 * @data_ptr: an orig_node object (may be NULL)
2729 * @flags: a pointer to store TT flags for this client to
2731 * Checks the validity of the given global TT entry. If it is, then the provided
2732 * flags pointer is updated either with the common (summed) TT flags if data_ptr
2733 * is NULL or the specific, per originator TT flags otherwise.
2735 * Return: true if the entry is a valid, false otherwise.
2737 static bool batadv_tt_global_valid(const void *entry_ptr,
2738 const void *data_ptr,
2739 u8 *flags)
2741 const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2742 const struct batadv_tt_global_entry *tt_global_entry;
2743 const struct batadv_orig_node *orig_node = data_ptr;
2745 if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2746 tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2747 return false;
2749 tt_global_entry = container_of(tt_common_entry,
2750 struct batadv_tt_global_entry,
2751 common);
2753 return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node,
2754 flags);
2758 * batadv_tt_tvlv_generate() - fill the tvlv buff with the tt entries from the
2759 * specified tt hash
2760 * @bat_priv: the bat priv with all the soft interface information
2761 * @hash: hash table containing the tt entries
2762 * @tt_len: expected tvlv tt data buffer length in number of bytes
2763 * @tvlv_buff: pointer to the buffer to fill with the TT data
2764 * @valid_cb: function to filter tt change entries and to return TT flags
2765 * @cb_data: data passed to the filter function as argument
2767 * Fills the tvlv buff with the tt entries from the specified hash. If valid_cb
2768 * is not provided then this becomes a no-op.
2770 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2771 struct batadv_hashtable *hash,
2772 void *tvlv_buff, u16 tt_len,
2773 bool (*valid_cb)(const void *,
2774 const void *,
2775 u8 *flags),
2776 void *cb_data)
2778 struct batadv_tt_common_entry *tt_common_entry;
2779 struct batadv_tvlv_tt_change *tt_change;
2780 struct hlist_head *head;
2781 u16 tt_tot, tt_num_entries = 0;
2782 u8 flags;
2783 bool ret;
2784 u32 i;
2786 tt_tot = batadv_tt_entries(tt_len);
2787 tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
2789 if (!valid_cb)
2790 return;
2792 rcu_read_lock();
2793 for (i = 0; i < hash->size; i++) {
2794 head = &hash->table[i];
2796 hlist_for_each_entry_rcu(tt_common_entry,
2797 head, hash_entry) {
2798 if (tt_tot == tt_num_entries)
2799 break;
2801 ret = valid_cb(tt_common_entry, cb_data, &flags);
2802 if (!ret)
2803 continue;
2805 ether_addr_copy(tt_change->addr, tt_common_entry->addr);
2806 tt_change->flags = flags;
2807 tt_change->vid = htons(tt_common_entry->vid);
2808 memset(tt_change->reserved, 0,
2809 sizeof(tt_change->reserved));
2811 tt_num_entries++;
2812 tt_change++;
2815 rcu_read_unlock();
2819 * batadv_tt_global_check_crc() - check if all the CRCs are correct
2820 * @orig_node: originator for which the CRCs have to be checked
2821 * @tt_vlan: pointer to the first tvlv VLAN entry
2822 * @num_vlan: number of tvlv VLAN entries
2824 * Return: true if all the received CRCs match the locally stored ones, false
2825 * otherwise
2827 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
2828 struct batadv_tvlv_tt_vlan_data *tt_vlan,
2829 u16 num_vlan)
2831 struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
2832 struct batadv_orig_node_vlan *vlan;
2833 int i, orig_num_vlan;
2834 u32 crc;
2836 /* check if each received CRC matches the locally stored one */
2837 for (i = 0; i < num_vlan; i++) {
2838 tt_vlan_tmp = tt_vlan + i;
2840 /* if orig_node is a backbone node for this VLAN, don't check
2841 * the CRC as we ignore all the global entries over it
2843 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
2844 orig_node->orig,
2845 ntohs(tt_vlan_tmp->vid)))
2846 continue;
2848 vlan = batadv_orig_node_vlan_get(orig_node,
2849 ntohs(tt_vlan_tmp->vid));
2850 if (!vlan)
2851 return false;
2853 crc = vlan->tt.crc;
2854 batadv_orig_node_vlan_put(vlan);
2856 if (crc != ntohl(tt_vlan_tmp->crc))
2857 return false;
2860 /* check if any excess VLANs exist locally for the originator
2861 * which are not mentioned in the TVLV from the originator.
2863 rcu_read_lock();
2864 orig_num_vlan = 0;
2865 hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list)
2866 orig_num_vlan++;
2867 rcu_read_unlock();
2869 if (orig_num_vlan > num_vlan)
2870 return false;
2872 return true;
2876 * batadv_tt_local_update_crc() - update all the local CRCs
2877 * @bat_priv: the bat priv with all the soft interface information
2879 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
2881 struct batadv_softif_vlan *vlan;
2883 /* recompute the global CRC for each VLAN */
2884 rcu_read_lock();
2885 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
2886 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
2888 rcu_read_unlock();
2892 * batadv_tt_global_update_crc() - update all the global CRCs for this orig_node
2893 * @bat_priv: the bat priv with all the soft interface information
2894 * @orig_node: the orig_node for which the CRCs have to be updated
2896 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
2897 struct batadv_orig_node *orig_node)
2899 struct batadv_orig_node_vlan *vlan;
2900 u32 crc;
2902 /* recompute the global CRC for each VLAN */
2903 rcu_read_lock();
2904 hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
2905 /* if orig_node is a backbone node for this VLAN, don't compute
2906 * the CRC as we ignore all the global entries over it
2908 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
2909 vlan->vid))
2910 continue;
2912 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
2913 vlan->tt.crc = crc;
2915 rcu_read_unlock();
2919 * batadv_send_tt_request() - send a TT Request message to a given node
2920 * @bat_priv: the bat priv with all the soft interface information
2921 * @dst_orig_node: the destination of the message
2922 * @ttvn: the version number that the source of the message is looking for
2923 * @tt_vlan: pointer to the first tvlv VLAN object to request
2924 * @num_vlan: number of tvlv VLAN entries
2925 * @full_table: ask for the entire translation table if true, while only for the
2926 * last TT diff otherwise
2928 * Return: true if the TT Request was sent, false otherwise
2930 static bool batadv_send_tt_request(struct batadv_priv *bat_priv,
2931 struct batadv_orig_node *dst_orig_node,
2932 u8 ttvn,
2933 struct batadv_tvlv_tt_vlan_data *tt_vlan,
2934 u16 num_vlan, bool full_table)
2936 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2937 struct batadv_tt_req_node *tt_req_node = NULL;
2938 struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
2939 struct batadv_hard_iface *primary_if;
2940 bool ret = false;
2941 int i, size;
2943 primary_if = batadv_primary_if_get_selected(bat_priv);
2944 if (!primary_if)
2945 goto out;
2947 /* The new tt_req will be issued only if I'm not waiting for a
2948 * reply from the same orig_node yet
2950 tt_req_node = batadv_tt_req_node_new(bat_priv, dst_orig_node);
2951 if (!tt_req_node)
2952 goto out;
2954 size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
2955 tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
2956 if (!tvlv_tt_data)
2957 goto out;
2959 tvlv_tt_data->flags = BATADV_TT_REQUEST;
2960 tvlv_tt_data->ttvn = ttvn;
2961 tvlv_tt_data->num_vlan = htons(num_vlan);
2963 /* send all the CRCs within the request. This is needed by intermediate
2964 * nodes to ensure they have the correct table before replying
2966 tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
2967 for (i = 0; i < num_vlan; i++) {
2968 tt_vlan_req->vid = tt_vlan->vid;
2969 tt_vlan_req->crc = tt_vlan->crc;
2971 tt_vlan_req++;
2972 tt_vlan++;
2975 if (full_table)
2976 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2978 batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
2979 dst_orig_node->orig, full_table ? 'F' : '.');
2981 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
2982 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2983 dst_orig_node->orig, BATADV_TVLV_TT, 1,
2984 tvlv_tt_data, size);
2985 ret = true;
2987 out:
2988 if (primary_if)
2989 batadv_hardif_put(primary_if);
2991 if (ret && tt_req_node) {
2992 spin_lock_bh(&bat_priv->tt.req_list_lock);
2993 if (!hlist_unhashed(&tt_req_node->list)) {
2994 hlist_del_init(&tt_req_node->list);
2995 batadv_tt_req_node_put(tt_req_node);
2997 spin_unlock_bh(&bat_priv->tt.req_list_lock);
3000 if (tt_req_node)
3001 batadv_tt_req_node_put(tt_req_node);
3003 kfree(tvlv_tt_data);
3004 return ret;
3008 * batadv_send_other_tt_response() - send reply to tt request concerning another
3009 * node's translation table
3010 * @bat_priv: the bat priv with all the soft interface information
3011 * @tt_data: tt data containing the tt request information
3012 * @req_src: mac address of tt request sender
3013 * @req_dst: mac address of tt request recipient
3015 * Return: true if tt request reply was sent, false otherwise.
3017 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
3018 struct batadv_tvlv_tt_data *tt_data,
3019 u8 *req_src, u8 *req_dst)
3021 struct batadv_orig_node *req_dst_orig_node;
3022 struct batadv_orig_node *res_dst_orig_node = NULL;
3023 struct batadv_tvlv_tt_change *tt_change;
3024 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
3025 struct batadv_tvlv_tt_vlan_data *tt_vlan;
3026 bool ret = false, full_table;
3027 u8 orig_ttvn, req_ttvn;
3028 u16 tvlv_len;
3029 s32 tt_len;
3031 batadv_dbg(BATADV_DBG_TT, bat_priv,
3032 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
3033 req_src, tt_data->ttvn, req_dst,
3034 ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3036 /* Let's get the orig node of the REAL destination */
3037 req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
3038 if (!req_dst_orig_node)
3039 goto out;
3041 res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
3042 if (!res_dst_orig_node)
3043 goto out;
3045 orig_ttvn = (u8)atomic_read(&req_dst_orig_node->last_ttvn);
3046 req_ttvn = tt_data->ttvn;
3048 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3049 /* this node doesn't have the requested data */
3050 if (orig_ttvn != req_ttvn ||
3051 !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
3052 ntohs(tt_data->num_vlan)))
3053 goto out;
3055 /* If the full table has been explicitly requested */
3056 if (tt_data->flags & BATADV_TT_FULL_TABLE ||
3057 !req_dst_orig_node->tt_buff)
3058 full_table = true;
3059 else
3060 full_table = false;
3062 /* TT fragmentation hasn't been implemented yet, so send as many
3063 * TT entries fit a single packet as possible only
3065 if (!full_table) {
3066 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
3067 tt_len = req_dst_orig_node->tt_buff_len;
3069 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
3070 &tvlv_tt_data,
3071 &tt_change,
3072 &tt_len);
3073 if (!tt_len)
3074 goto unlock;
3076 /* Copy the last orig_node's OGM buffer */
3077 memcpy(tt_change, req_dst_orig_node->tt_buff,
3078 req_dst_orig_node->tt_buff_len);
3079 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
3080 } else {
3081 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
3082 * in the initial part
3084 tt_len = -1;
3085 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
3086 &tvlv_tt_data,
3087 &tt_change,
3088 &tt_len);
3089 if (!tt_len)
3090 goto out;
3092 /* fill the rest of the tvlv with the real TT entries */
3093 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
3094 tt_change, tt_len,
3095 batadv_tt_global_valid,
3096 req_dst_orig_node);
3099 /* Don't send the response, if larger than fragmented packet. */
3100 tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
3101 if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
3102 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
3103 "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
3104 res_dst_orig_node->orig);
3105 goto out;
3108 tvlv_tt_data->flags = BATADV_TT_RESPONSE;
3109 tvlv_tt_data->ttvn = req_ttvn;
3111 if (full_table)
3112 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
3114 batadv_dbg(BATADV_DBG_TT, bat_priv,
3115 "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
3116 res_dst_orig_node->orig, req_dst_orig_node->orig,
3117 full_table ? 'F' : '.', req_ttvn);
3119 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
3121 batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
3122 req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
3123 tvlv_len);
3125 ret = true;
3126 goto out;
3128 unlock:
3129 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
3131 out:
3132 if (res_dst_orig_node)
3133 batadv_orig_node_put(res_dst_orig_node);
3134 if (req_dst_orig_node)
3135 batadv_orig_node_put(req_dst_orig_node);
3136 kfree(tvlv_tt_data);
3137 return ret;
3141 * batadv_send_my_tt_response() - send reply to tt request concerning this
3142 * node's translation table
3143 * @bat_priv: the bat priv with all the soft interface information
3144 * @tt_data: tt data containing the tt request information
3145 * @req_src: mac address of tt request sender
3147 * Return: true if tt request reply was sent, false otherwise.
3149 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
3150 struct batadv_tvlv_tt_data *tt_data,
3151 u8 *req_src)
3153 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
3154 struct batadv_hard_iface *primary_if = NULL;
3155 struct batadv_tvlv_tt_change *tt_change;
3156 struct batadv_orig_node *orig_node;
3157 u8 my_ttvn, req_ttvn;
3158 u16 tvlv_len;
3159 bool full_table;
3160 s32 tt_len;
3162 batadv_dbg(BATADV_DBG_TT, bat_priv,
3163 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
3164 req_src, tt_data->ttvn,
3165 ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3167 spin_lock_bh(&bat_priv->tt.commit_lock);
3169 my_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
3170 req_ttvn = tt_data->ttvn;
3172 orig_node = batadv_orig_hash_find(bat_priv, req_src);
3173 if (!orig_node)
3174 goto out;
3176 primary_if = batadv_primary_if_get_selected(bat_priv);
3177 if (!primary_if)
3178 goto out;
3180 /* If the full table has been explicitly requested or the gap
3181 * is too big send the whole local translation table
3183 if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
3184 !bat_priv->tt.last_changeset)
3185 full_table = true;
3186 else
3187 full_table = false;
3189 /* TT fragmentation hasn't been implemented yet, so send as many
3190 * TT entries fit a single packet as possible only
3192 if (!full_table) {
3193 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
3195 tt_len = bat_priv->tt.last_changeset_len;
3196 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
3197 &tvlv_tt_data,
3198 &tt_change,
3199 &tt_len);
3200 if (!tt_len || !tvlv_len)
3201 goto unlock;
3203 /* Copy the last orig_node's OGM buffer */
3204 memcpy(tt_change, bat_priv->tt.last_changeset,
3205 bat_priv->tt.last_changeset_len);
3206 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
3207 } else {
3208 req_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
3210 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
3211 * in the initial part
3213 tt_len = -1;
3214 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
3215 &tvlv_tt_data,
3216 &tt_change,
3217 &tt_len);
3218 if (!tt_len || !tvlv_len)
3219 goto out;
3221 /* fill the rest of the tvlv with the real TT entries */
3222 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
3223 tt_change, tt_len,
3224 batadv_tt_local_valid, NULL);
3227 tvlv_tt_data->flags = BATADV_TT_RESPONSE;
3228 tvlv_tt_data->ttvn = req_ttvn;
3230 if (full_table)
3231 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
3233 batadv_dbg(BATADV_DBG_TT, bat_priv,
3234 "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
3235 orig_node->orig, full_table ? 'F' : '.', req_ttvn);
3237 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
3239 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3240 req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
3241 tvlv_len);
3243 goto out;
3245 unlock:
3246 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
3247 out:
3248 spin_unlock_bh(&bat_priv->tt.commit_lock);
3249 if (orig_node)
3250 batadv_orig_node_put(orig_node);
3251 if (primary_if)
3252 batadv_hardif_put(primary_if);
3253 kfree(tvlv_tt_data);
3254 /* The packet was for this host, so it doesn't need to be re-routed */
3255 return true;
3259 * batadv_send_tt_response() - send reply to tt request
3260 * @bat_priv: the bat priv with all the soft interface information
3261 * @tt_data: tt data containing the tt request information
3262 * @req_src: mac address of tt request sender
3263 * @req_dst: mac address of tt request recipient
3265 * Return: true if tt request reply was sent, false otherwise.
3267 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
3268 struct batadv_tvlv_tt_data *tt_data,
3269 u8 *req_src, u8 *req_dst)
3271 if (batadv_is_my_mac(bat_priv, req_dst))
3272 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
3273 return batadv_send_other_tt_response(bat_priv, tt_data, req_src,
3274 req_dst);
3277 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
3278 struct batadv_orig_node *orig_node,
3279 struct batadv_tvlv_tt_change *tt_change,
3280 u16 tt_num_changes, u8 ttvn)
3282 int i;
3283 int roams;
3285 for (i = 0; i < tt_num_changes; i++) {
3286 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
3287 roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
3288 batadv_tt_global_del(bat_priv, orig_node,
3289 (tt_change + i)->addr,
3290 ntohs((tt_change + i)->vid),
3291 "tt removed by changes",
3292 roams);
3293 } else {
3294 if (!batadv_tt_global_add(bat_priv, orig_node,
3295 (tt_change + i)->addr,
3296 ntohs((tt_change + i)->vid),
3297 (tt_change + i)->flags, ttvn))
3298 /* In case of problem while storing a
3299 * global_entry, we stop the updating
3300 * procedure without committing the
3301 * ttvn change. This will avoid to send
3302 * corrupted data on tt_request
3304 return;
3307 set_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
3310 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
3311 struct batadv_tvlv_tt_change *tt_change,
3312 u8 ttvn, u8 *resp_src,
3313 u16 num_entries)
3315 struct batadv_orig_node *orig_node;
3317 orig_node = batadv_orig_hash_find(bat_priv, resp_src);
3318 if (!orig_node)
3319 goto out;
3321 /* Purge the old table first.. */
3322 batadv_tt_global_del_orig(bat_priv, orig_node, -1,
3323 "Received full table");
3325 _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
3326 ttvn);
3328 spin_lock_bh(&orig_node->tt_buff_lock);
3329 kfree(orig_node->tt_buff);
3330 orig_node->tt_buff_len = 0;
3331 orig_node->tt_buff = NULL;
3332 spin_unlock_bh(&orig_node->tt_buff_lock);
3334 atomic_set(&orig_node->last_ttvn, ttvn);
3336 out:
3337 if (orig_node)
3338 batadv_orig_node_put(orig_node);
3341 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
3342 struct batadv_orig_node *orig_node,
3343 u16 tt_num_changes, u8 ttvn,
3344 struct batadv_tvlv_tt_change *tt_change)
3346 _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
3347 tt_num_changes, ttvn);
3349 batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
3350 batadv_tt_len(tt_num_changes));
3351 atomic_set(&orig_node->last_ttvn, ttvn);
3355 * batadv_is_my_client() - check if a client is served by the local node
3356 * @bat_priv: the bat priv with all the soft interface information
3357 * @addr: the mac address of the client to check
3358 * @vid: VLAN identifier
3360 * Return: true if the client is served by this node, false otherwise.
3362 bool batadv_is_my_client(struct batadv_priv *bat_priv, const u8 *addr,
3363 unsigned short vid)
3365 struct batadv_tt_local_entry *tt_local_entry;
3366 bool ret = false;
3368 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3369 if (!tt_local_entry)
3370 goto out;
3371 /* Check if the client has been logically deleted (but is kept for
3372 * consistency purpose)
3374 if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
3375 (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
3376 goto out;
3377 ret = true;
3378 out:
3379 if (tt_local_entry)
3380 batadv_tt_local_entry_put(tt_local_entry);
3381 return ret;
3385 * batadv_handle_tt_response() - process incoming tt reply
3386 * @bat_priv: the bat priv with all the soft interface information
3387 * @tt_data: tt data containing the tt request information
3388 * @resp_src: mac address of tt reply sender
3389 * @num_entries: number of tt change entries appended to the tt data
3391 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
3392 struct batadv_tvlv_tt_data *tt_data,
3393 u8 *resp_src, u16 num_entries)
3395 struct batadv_tt_req_node *node;
3396 struct hlist_node *safe;
3397 struct batadv_orig_node *orig_node = NULL;
3398 struct batadv_tvlv_tt_change *tt_change;
3399 u8 *tvlv_ptr = (u8 *)tt_data;
3400 u16 change_offset;
3402 batadv_dbg(BATADV_DBG_TT, bat_priv,
3403 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
3404 resp_src, tt_data->ttvn, num_entries,
3405 ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3407 orig_node = batadv_orig_hash_find(bat_priv, resp_src);
3408 if (!orig_node)
3409 goto out;
3411 spin_lock_bh(&orig_node->tt_lock);
3413 change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
3414 change_offset *= ntohs(tt_data->num_vlan);
3415 change_offset += sizeof(*tt_data);
3416 tvlv_ptr += change_offset;
3418 tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
3419 if (tt_data->flags & BATADV_TT_FULL_TABLE) {
3420 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
3421 resp_src, num_entries);
3422 } else {
3423 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
3424 tt_data->ttvn, tt_change);
3427 /* Recalculate the CRC for this orig_node and store it */
3428 batadv_tt_global_update_crc(bat_priv, orig_node);
3430 spin_unlock_bh(&orig_node->tt_lock);
3432 /* Delete the tt_req_node from pending tt_requests list */
3433 spin_lock_bh(&bat_priv->tt.req_list_lock);
3434 hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
3435 if (!batadv_compare_eth(node->addr, resp_src))
3436 continue;
3437 hlist_del_init(&node->list);
3438 batadv_tt_req_node_put(node);
3441 spin_unlock_bh(&bat_priv->tt.req_list_lock);
3442 out:
3443 if (orig_node)
3444 batadv_orig_node_put(orig_node);
3447 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
3449 struct batadv_tt_roam_node *node, *safe;
3451 spin_lock_bh(&bat_priv->tt.roam_list_lock);
3453 list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3454 list_del(&node->list);
3455 kmem_cache_free(batadv_tt_roam_cache, node);
3458 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3461 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
3463 struct batadv_tt_roam_node *node, *safe;
3465 spin_lock_bh(&bat_priv->tt.roam_list_lock);
3466 list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3467 if (!batadv_has_timed_out(node->first_time,
3468 BATADV_ROAMING_MAX_TIME))
3469 continue;
3471 list_del(&node->list);
3472 kmem_cache_free(batadv_tt_roam_cache, node);
3474 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3478 * batadv_tt_check_roam_count() - check if a client has roamed too frequently
3479 * @bat_priv: the bat priv with all the soft interface information
3480 * @client: mac address of the roaming client
3482 * This function checks whether the client already reached the
3483 * maximum number of possible roaming phases. In this case the ROAMING_ADV
3484 * will not be sent.
3486 * Return: true if the ROAMING_ADV can be sent, false otherwise
3488 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, u8 *client)
3490 struct batadv_tt_roam_node *tt_roam_node;
3491 bool ret = false;
3493 spin_lock_bh(&bat_priv->tt.roam_list_lock);
3494 /* The new tt_req will be issued only if I'm not waiting for a
3495 * reply from the same orig_node yet
3497 list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
3498 if (!batadv_compare_eth(tt_roam_node->addr, client))
3499 continue;
3501 if (batadv_has_timed_out(tt_roam_node->first_time,
3502 BATADV_ROAMING_MAX_TIME))
3503 continue;
3505 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
3506 /* Sorry, you roamed too many times! */
3507 goto unlock;
3508 ret = true;
3509 break;
3512 if (!ret) {
3513 tt_roam_node = kmem_cache_alloc(batadv_tt_roam_cache,
3514 GFP_ATOMIC);
3515 if (!tt_roam_node)
3516 goto unlock;
3518 tt_roam_node->first_time = jiffies;
3519 atomic_set(&tt_roam_node->counter,
3520 BATADV_ROAMING_MAX_COUNT - 1);
3521 ether_addr_copy(tt_roam_node->addr, client);
3523 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
3524 ret = true;
3527 unlock:
3528 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3529 return ret;
3533 * batadv_send_roam_adv() - send a roaming advertisement message
3534 * @bat_priv: the bat priv with all the soft interface information
3535 * @client: mac address of the roaming client
3536 * @vid: VLAN identifier
3537 * @orig_node: message destination
3539 * Send a ROAMING_ADV message to the node which was previously serving this
3540 * client. This is done to inform the node that from now on all traffic destined
3541 * for this particular roamed client has to be forwarded to the sender of the
3542 * roaming message.
3544 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
3545 unsigned short vid,
3546 struct batadv_orig_node *orig_node)
3548 struct batadv_hard_iface *primary_if;
3549 struct batadv_tvlv_roam_adv tvlv_roam;
3551 primary_if = batadv_primary_if_get_selected(bat_priv);
3552 if (!primary_if)
3553 goto out;
3555 /* before going on we have to check whether the client has
3556 * already roamed to us too many times
3558 if (!batadv_tt_check_roam_count(bat_priv, client))
3559 goto out;
3561 batadv_dbg(BATADV_DBG_TT, bat_priv,
3562 "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
3563 orig_node->orig, client, batadv_print_vid(vid));
3565 batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
3567 memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
3568 tvlv_roam.vid = htons(vid);
3570 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3571 orig_node->orig, BATADV_TVLV_ROAM, 1,
3572 &tvlv_roam, sizeof(tvlv_roam));
3574 out:
3575 if (primary_if)
3576 batadv_hardif_put(primary_if);
3579 static void batadv_tt_purge(struct work_struct *work)
3581 struct delayed_work *delayed_work;
3582 struct batadv_priv_tt *priv_tt;
3583 struct batadv_priv *bat_priv;
3585 delayed_work = to_delayed_work(work);
3586 priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
3587 bat_priv = container_of(priv_tt, struct batadv_priv, tt);
3589 batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
3590 batadv_tt_global_purge(bat_priv);
3591 batadv_tt_req_purge(bat_priv);
3592 batadv_tt_roam_purge(bat_priv);
3594 queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3595 msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3599 * batadv_tt_free() - Free translation table of soft interface
3600 * @bat_priv: the bat priv with all the soft interface information
3602 void batadv_tt_free(struct batadv_priv *bat_priv)
3604 batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_ROAM, 1);
3606 batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
3607 batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
3609 cancel_delayed_work_sync(&bat_priv->tt.work);
3611 batadv_tt_local_table_free(bat_priv);
3612 batadv_tt_global_table_free(bat_priv);
3613 batadv_tt_req_list_free(bat_priv);
3614 batadv_tt_changes_list_free(bat_priv);
3615 batadv_tt_roam_list_free(bat_priv);
3617 kfree(bat_priv->tt.last_changeset);
3621 * batadv_tt_local_set_flags() - set or unset the specified flags on the local
3622 * table and possibly count them in the TT size
3623 * @bat_priv: the bat priv with all the soft interface information
3624 * @flags: the flag to switch
3625 * @enable: whether to set or unset the flag
3626 * @count: whether to increase the TT size by the number of changed entries
3628 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv, u16 flags,
3629 bool enable, bool count)
3631 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3632 struct batadv_tt_common_entry *tt_common_entry;
3633 struct hlist_head *head;
3634 u32 i;
3636 if (!hash)
3637 return;
3639 for (i = 0; i < hash->size; i++) {
3640 head = &hash->table[i];
3642 rcu_read_lock();
3643 hlist_for_each_entry_rcu(tt_common_entry,
3644 head, hash_entry) {
3645 if (enable) {
3646 if ((tt_common_entry->flags & flags) == flags)
3647 continue;
3648 tt_common_entry->flags |= flags;
3649 } else {
3650 if (!(tt_common_entry->flags & flags))
3651 continue;
3652 tt_common_entry->flags &= ~flags;
3655 if (!count)
3656 continue;
3658 batadv_tt_local_size_inc(bat_priv,
3659 tt_common_entry->vid);
3661 rcu_read_unlock();
3665 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3666 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3668 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3669 struct batadv_tt_common_entry *tt_common;
3670 struct batadv_tt_local_entry *tt_local;
3671 struct hlist_node *node_tmp;
3672 struct hlist_head *head;
3673 spinlock_t *list_lock; /* protects write access to the hash lists */
3674 u32 i;
3676 if (!hash)
3677 return;
3679 for (i = 0; i < hash->size; i++) {
3680 head = &hash->table[i];
3681 list_lock = &hash->list_locks[i];
3683 spin_lock_bh(list_lock);
3684 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3685 hash_entry) {
3686 if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3687 continue;
3689 batadv_dbg(BATADV_DBG_TT, bat_priv,
3690 "Deleting local tt entry (%pM, vid: %d): pending\n",
3691 tt_common->addr,
3692 batadv_print_vid(tt_common->vid));
3694 batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3695 hlist_del_rcu(&tt_common->hash_entry);
3696 tt_local = container_of(tt_common,
3697 struct batadv_tt_local_entry,
3698 common);
3700 batadv_tt_local_entry_put(tt_local);
3702 spin_unlock_bh(list_lock);
3707 * batadv_tt_local_commit_changes_nolock() - commit all pending local tt changes
3708 * which have been queued in the time since the last commit
3709 * @bat_priv: the bat priv with all the soft interface information
3711 * Caller must hold tt->commit_lock.
3713 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3715 lockdep_assert_held(&bat_priv->tt.commit_lock);
3717 if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3718 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3719 batadv_tt_tvlv_container_update(bat_priv);
3720 return;
3723 batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3725 batadv_tt_local_purge_pending_clients(bat_priv);
3726 batadv_tt_local_update_crc(bat_priv);
3728 /* Increment the TTVN only once per OGM interval */
3729 atomic_inc(&bat_priv->tt.vn);
3730 batadv_dbg(BATADV_DBG_TT, bat_priv,
3731 "Local changes committed, updating to ttvn %u\n",
3732 (u8)atomic_read(&bat_priv->tt.vn));
3734 /* reset the sending counter */
3735 atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3736 batadv_tt_tvlv_container_update(bat_priv);
3740 * batadv_tt_local_commit_changes() - commit all pending local tt changes which
3741 * have been queued in the time since the last commit
3742 * @bat_priv: the bat priv with all the soft interface information
3744 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3746 spin_lock_bh(&bat_priv->tt.commit_lock);
3747 batadv_tt_local_commit_changes_nolock(bat_priv);
3748 spin_unlock_bh(&bat_priv->tt.commit_lock);
3752 * batadv_is_ap_isolated() - Check if packet from upper layer should be dropped
3753 * @bat_priv: the bat priv with all the soft interface information
3754 * @src: source mac address of packet
3755 * @dst: destination mac address of packet
3756 * @vid: vlan id of packet
3758 * Return: true when src+dst(+vid) pair should be isolated, false otherwise
3760 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, u8 *src, u8 *dst,
3761 unsigned short vid)
3763 struct batadv_tt_local_entry *tt_local_entry;
3764 struct batadv_tt_global_entry *tt_global_entry;
3765 struct batadv_softif_vlan *vlan;
3766 bool ret = false;
3768 vlan = batadv_softif_vlan_get(bat_priv, vid);
3769 if (!vlan)
3770 return false;
3772 if (!atomic_read(&vlan->ap_isolation))
3773 goto vlan_put;
3775 tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3776 if (!tt_local_entry)
3777 goto vlan_put;
3779 tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
3780 if (!tt_global_entry)
3781 goto local_entry_put;
3783 if (_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3784 ret = true;
3786 batadv_tt_global_entry_put(tt_global_entry);
3787 local_entry_put:
3788 batadv_tt_local_entry_put(tt_local_entry);
3789 vlan_put:
3790 batadv_softif_vlan_put(vlan);
3791 return ret;
3795 * batadv_tt_update_orig() - update global translation table with new tt
3796 * information received via ogms
3797 * @bat_priv: the bat priv with all the soft interface information
3798 * @orig_node: the orig_node of the ogm
3799 * @tt_buff: pointer to the first tvlv VLAN entry
3800 * @tt_num_vlan: number of tvlv VLAN entries
3801 * @tt_change: pointer to the first entry in the TT buffer
3802 * @tt_num_changes: number of tt changes inside the tt buffer
3803 * @ttvn: translation table version number of this changeset
3805 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
3806 struct batadv_orig_node *orig_node,
3807 const void *tt_buff, u16 tt_num_vlan,
3808 struct batadv_tvlv_tt_change *tt_change,
3809 u16 tt_num_changes, u8 ttvn)
3811 u8 orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn);
3812 struct batadv_tvlv_tt_vlan_data *tt_vlan;
3813 bool full_table = true;
3814 bool has_tt_init;
3816 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
3817 has_tt_init = test_bit(BATADV_ORIG_CAPA_HAS_TT,
3818 &orig_node->capa_initialized);
3820 /* orig table not initialised AND first diff is in the OGM OR the ttvn
3821 * increased by one -> we can apply the attached changes
3823 if ((!has_tt_init && ttvn == 1) || ttvn - orig_ttvn == 1) {
3824 /* the OGM could not contain the changes due to their size or
3825 * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3826 * times.
3827 * In this case send a tt request
3829 if (!tt_num_changes) {
3830 full_table = false;
3831 goto request_table;
3834 spin_lock_bh(&orig_node->tt_lock);
3836 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
3837 ttvn, tt_change);
3839 /* Even if we received the precomputed crc with the OGM, we
3840 * prefer to recompute it to spot any possible inconsistency
3841 * in the global table
3843 batadv_tt_global_update_crc(bat_priv, orig_node);
3845 spin_unlock_bh(&orig_node->tt_lock);
3847 /* The ttvn alone is not enough to guarantee consistency
3848 * because a single value could represent different states
3849 * (due to the wrap around). Thus a node has to check whether
3850 * the resulting table (after applying the changes) is still
3851 * consistent or not. E.g. a node could disconnect while its
3852 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3853 * checking the CRC value is mandatory to detect the
3854 * inconsistency
3856 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
3857 tt_num_vlan))
3858 goto request_table;
3859 } else {
3860 /* if we missed more than one change or our tables are not
3861 * in sync anymore -> request fresh tt data
3863 if (!has_tt_init || ttvn != orig_ttvn ||
3864 !batadv_tt_global_check_crc(orig_node, tt_vlan,
3865 tt_num_vlan)) {
3866 request_table:
3867 batadv_dbg(BATADV_DBG_TT, bat_priv,
3868 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3869 orig_node->orig, ttvn, orig_ttvn,
3870 tt_num_changes);
3871 batadv_send_tt_request(bat_priv, orig_node, ttvn,
3872 tt_vlan, tt_num_vlan,
3873 full_table);
3874 return;
3880 * batadv_tt_global_client_is_roaming() - check if a client is marked as roaming
3881 * @bat_priv: the bat priv with all the soft interface information
3882 * @addr: the mac address of the client to check
3883 * @vid: VLAN identifier
3885 * Return: true if we know that the client has moved from its old originator
3886 * to another one. This entry is still kept for consistency purposes and will be
3887 * deleted later by a DEL or because of timeout
3889 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
3890 u8 *addr, unsigned short vid)
3892 struct batadv_tt_global_entry *tt_global_entry;
3893 bool ret = false;
3895 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
3896 if (!tt_global_entry)
3897 goto out;
3899 ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3900 batadv_tt_global_entry_put(tt_global_entry);
3901 out:
3902 return ret;
3906 * batadv_tt_local_client_is_roaming() - tells whether the client is roaming
3907 * @bat_priv: the bat priv with all the soft interface information
3908 * @addr: the mac address of the local client to query
3909 * @vid: VLAN identifier
3911 * Return: true if the local client is known to be roaming (it is not served by
3912 * this node anymore) or not. If yes, the client is still present in the table
3913 * to keep the latter consistent with the node TTVN
3915 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
3916 u8 *addr, unsigned short vid)
3918 struct batadv_tt_local_entry *tt_local_entry;
3919 bool ret = false;
3921 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3922 if (!tt_local_entry)
3923 goto out;
3925 ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3926 batadv_tt_local_entry_put(tt_local_entry);
3927 out:
3928 return ret;
3932 * batadv_tt_add_temporary_global_entry() - Add temporary entry to global TT
3933 * @bat_priv: the bat priv with all the soft interface information
3934 * @orig_node: orig node which the temporary entry should be associated with
3935 * @addr: mac address of the client
3936 * @vid: VLAN id of the new temporary global translation table
3938 * Return: true when temporary tt entry could be added, false otherwise
3940 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
3941 struct batadv_orig_node *orig_node,
3942 const unsigned char *addr,
3943 unsigned short vid)
3945 /* ignore loop detect macs, they are not supposed to be in the tt local
3946 * data as well.
3948 if (batadv_bla_is_loopdetect_mac(addr))
3949 return false;
3951 if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
3952 BATADV_TT_CLIENT_TEMP,
3953 atomic_read(&orig_node->last_ttvn)))
3954 return false;
3956 batadv_dbg(BATADV_DBG_TT, bat_priv,
3957 "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3958 addr, batadv_print_vid(vid), orig_node->orig);
3960 return true;
3964 * batadv_tt_local_resize_to_mtu() - resize the local translation table fit the
3965 * maximum packet size that can be transported through the mesh
3966 * @soft_iface: netdev struct of the mesh interface
3968 * Remove entries older than 'timeout' and half timeout if more entries need
3969 * to be removed.
3971 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
3973 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
3974 int packet_size_max = atomic_read(&bat_priv->packet_size_max);
3975 int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
3976 bool reduced = false;
3978 spin_lock_bh(&bat_priv->tt.commit_lock);
3980 while (true) {
3981 table_size = batadv_tt_local_table_transmit_size(bat_priv);
3982 if (packet_size_max >= table_size)
3983 break;
3985 batadv_tt_local_purge(bat_priv, timeout);
3986 batadv_tt_local_purge_pending_clients(bat_priv);
3988 timeout /= 2;
3989 reduced = true;
3990 net_ratelimited_function(batadv_info, soft_iface,
3991 "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3992 packet_size_max);
3995 /* commit these changes immediately, to avoid synchronization problem
3996 * with the TTVN
3998 if (reduced)
3999 batadv_tt_local_commit_changes_nolock(bat_priv);
4001 spin_unlock_bh(&bat_priv->tt.commit_lock);
4005 * batadv_tt_tvlv_ogm_handler_v1() - process incoming tt tvlv container
4006 * @bat_priv: the bat priv with all the soft interface information
4007 * @orig: the orig_node of the ogm
4008 * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
4009 * @tvlv_value: tvlv buffer containing the gateway data
4010 * @tvlv_value_len: tvlv buffer length
4012 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
4013 struct batadv_orig_node *orig,
4014 u8 flags, void *tvlv_value,
4015 u16 tvlv_value_len)
4017 struct batadv_tvlv_tt_vlan_data *tt_vlan;
4018 struct batadv_tvlv_tt_change *tt_change;
4019 struct batadv_tvlv_tt_data *tt_data;
4020 u16 num_entries, num_vlan;
4022 if (tvlv_value_len < sizeof(*tt_data))
4023 return;
4025 tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
4026 tvlv_value_len -= sizeof(*tt_data);
4028 num_vlan = ntohs(tt_data->num_vlan);
4030 if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
4031 return;
4033 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
4034 tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
4035 tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
4037 num_entries = batadv_tt_entries(tvlv_value_len);
4039 batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
4040 num_entries, tt_data->ttvn);
4044 * batadv_tt_tvlv_unicast_handler_v1() - process incoming (unicast) tt tvlv
4045 * container
4046 * @bat_priv: the bat priv with all the soft interface information
4047 * @src: mac address of tt tvlv sender
4048 * @dst: mac address of tt tvlv recipient
4049 * @tvlv_value: tvlv buffer containing the tt data
4050 * @tvlv_value_len: tvlv buffer length
4052 * Return: NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
4053 * otherwise.
4055 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
4056 u8 *src, u8 *dst,
4057 void *tvlv_value,
4058 u16 tvlv_value_len)
4060 struct batadv_tvlv_tt_data *tt_data;
4061 u16 tt_vlan_len, tt_num_entries;
4062 char tt_flag;
4063 bool ret;
4065 if (tvlv_value_len < sizeof(*tt_data))
4066 return NET_RX_SUCCESS;
4068 tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
4069 tvlv_value_len -= sizeof(*tt_data);
4071 tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
4072 tt_vlan_len *= ntohs(tt_data->num_vlan);
4074 if (tvlv_value_len < tt_vlan_len)
4075 return NET_RX_SUCCESS;
4077 tvlv_value_len -= tt_vlan_len;
4078 tt_num_entries = batadv_tt_entries(tvlv_value_len);
4080 switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
4081 case BATADV_TT_REQUEST:
4082 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
4084 /* If this node cannot provide a TT response the tt_request is
4085 * forwarded
4087 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
4088 if (!ret) {
4089 if (tt_data->flags & BATADV_TT_FULL_TABLE)
4090 tt_flag = 'F';
4091 else
4092 tt_flag = '.';
4094 batadv_dbg(BATADV_DBG_TT, bat_priv,
4095 "Routing TT_REQUEST to %pM [%c]\n",
4096 dst, tt_flag);
4097 /* tvlv API will re-route the packet */
4098 return NET_RX_DROP;
4100 break;
4101 case BATADV_TT_RESPONSE:
4102 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
4104 if (batadv_is_my_mac(bat_priv, dst)) {
4105 batadv_handle_tt_response(bat_priv, tt_data,
4106 src, tt_num_entries);
4107 return NET_RX_SUCCESS;
4110 if (tt_data->flags & BATADV_TT_FULL_TABLE)
4111 tt_flag = 'F';
4112 else
4113 tt_flag = '.';
4115 batadv_dbg(BATADV_DBG_TT, bat_priv,
4116 "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
4118 /* tvlv API will re-route the packet */
4119 return NET_RX_DROP;
4122 return NET_RX_SUCCESS;
4126 * batadv_roam_tvlv_unicast_handler_v1() - process incoming tt roam tvlv
4127 * container
4128 * @bat_priv: the bat priv with all the soft interface information
4129 * @src: mac address of tt tvlv sender
4130 * @dst: mac address of tt tvlv recipient
4131 * @tvlv_value: tvlv buffer containing the tt data
4132 * @tvlv_value_len: tvlv buffer length
4134 * Return: NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
4135 * otherwise.
4137 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
4138 u8 *src, u8 *dst,
4139 void *tvlv_value,
4140 u16 tvlv_value_len)
4142 struct batadv_tvlv_roam_adv *roaming_adv;
4143 struct batadv_orig_node *orig_node = NULL;
4145 /* If this node is not the intended recipient of the
4146 * roaming advertisement the packet is forwarded
4147 * (the tvlv API will re-route the packet).
4149 if (!batadv_is_my_mac(bat_priv, dst))
4150 return NET_RX_DROP;
4152 if (tvlv_value_len < sizeof(*roaming_adv))
4153 goto out;
4155 orig_node = batadv_orig_hash_find(bat_priv, src);
4156 if (!orig_node)
4157 goto out;
4159 batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
4160 roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
4162 batadv_dbg(BATADV_DBG_TT, bat_priv,
4163 "Received ROAMING_ADV from %pM (client %pM)\n",
4164 src, roaming_adv->client);
4166 batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
4167 ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
4168 atomic_read(&orig_node->last_ttvn) + 1);
4170 out:
4171 if (orig_node)
4172 batadv_orig_node_put(orig_node);
4173 return NET_RX_SUCCESS;
4177 * batadv_tt_init() - initialise the translation table internals
4178 * @bat_priv: the bat priv with all the soft interface information
4180 * Return: 0 on success or negative error number in case of failure.
4182 int batadv_tt_init(struct batadv_priv *bat_priv)
4184 int ret;
4186 /* synchronized flags must be remote */
4187 BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
4189 ret = batadv_tt_local_init(bat_priv);
4190 if (ret < 0)
4191 return ret;
4193 ret = batadv_tt_global_init(bat_priv);
4194 if (ret < 0)
4195 return ret;
4197 batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
4198 batadv_tt_tvlv_unicast_handler_v1,
4199 BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
4201 batadv_tvlv_handler_register(bat_priv, NULL,
4202 batadv_roam_tvlv_unicast_handler_v1,
4203 BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
4205 INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
4206 queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
4207 msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
4209 return 1;
4213 * batadv_tt_global_is_isolated() - check if a client is marked as isolated
4214 * @bat_priv: the bat priv with all the soft interface information
4215 * @addr: the mac address of the client
4216 * @vid: the identifier of the VLAN where this client is connected
4218 * Return: true if the client is marked with the TT_CLIENT_ISOLA flag, false
4219 * otherwise
4221 bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
4222 const u8 *addr, unsigned short vid)
4224 struct batadv_tt_global_entry *tt;
4225 bool ret;
4227 tt = batadv_tt_global_hash_find(bat_priv, addr, vid);
4228 if (!tt)
4229 return false;
4231 ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA;
4233 batadv_tt_global_entry_put(tt);
4235 return ret;
4239 * batadv_tt_cache_init() - Initialize tt memory object cache
4241 * Return: 0 on success or negative error number in case of failure.
4243 int __init batadv_tt_cache_init(void)
4245 size_t tl_size = sizeof(struct batadv_tt_local_entry);
4246 size_t tg_size = sizeof(struct batadv_tt_global_entry);
4247 size_t tt_orig_size = sizeof(struct batadv_tt_orig_list_entry);
4248 size_t tt_change_size = sizeof(struct batadv_tt_change_node);
4249 size_t tt_req_size = sizeof(struct batadv_tt_req_node);
4250 size_t tt_roam_size = sizeof(struct batadv_tt_roam_node);
4252 batadv_tl_cache = kmem_cache_create("batadv_tl_cache", tl_size, 0,
4253 SLAB_HWCACHE_ALIGN, NULL);
4254 if (!batadv_tl_cache)
4255 return -ENOMEM;
4257 batadv_tg_cache = kmem_cache_create("batadv_tg_cache", tg_size, 0,
4258 SLAB_HWCACHE_ALIGN, NULL);
4259 if (!batadv_tg_cache)
4260 goto err_tt_tl_destroy;
4262 batadv_tt_orig_cache = kmem_cache_create("batadv_tt_orig_cache",
4263 tt_orig_size, 0,
4264 SLAB_HWCACHE_ALIGN, NULL);
4265 if (!batadv_tt_orig_cache)
4266 goto err_tt_tg_destroy;
4268 batadv_tt_change_cache = kmem_cache_create("batadv_tt_change_cache",
4269 tt_change_size, 0,
4270 SLAB_HWCACHE_ALIGN, NULL);
4271 if (!batadv_tt_change_cache)
4272 goto err_tt_orig_destroy;
4274 batadv_tt_req_cache = kmem_cache_create("batadv_tt_req_cache",
4275 tt_req_size, 0,
4276 SLAB_HWCACHE_ALIGN, NULL);
4277 if (!batadv_tt_req_cache)
4278 goto err_tt_change_destroy;
4280 batadv_tt_roam_cache = kmem_cache_create("batadv_tt_roam_cache",
4281 tt_roam_size, 0,
4282 SLAB_HWCACHE_ALIGN, NULL);
4283 if (!batadv_tt_roam_cache)
4284 goto err_tt_req_destroy;
4286 return 0;
4288 err_tt_req_destroy:
4289 kmem_cache_destroy(batadv_tt_req_cache);
4290 batadv_tt_req_cache = NULL;
4291 err_tt_change_destroy:
4292 kmem_cache_destroy(batadv_tt_change_cache);
4293 batadv_tt_change_cache = NULL;
4294 err_tt_orig_destroy:
4295 kmem_cache_destroy(batadv_tt_orig_cache);
4296 batadv_tt_orig_cache = NULL;
4297 err_tt_tg_destroy:
4298 kmem_cache_destroy(batadv_tg_cache);
4299 batadv_tg_cache = NULL;
4300 err_tt_tl_destroy:
4301 kmem_cache_destroy(batadv_tl_cache);
4302 batadv_tl_cache = NULL;
4304 return -ENOMEM;
4308 * batadv_tt_cache_destroy() - Destroy tt memory object cache
4310 void batadv_tt_cache_destroy(void)
4312 kmem_cache_destroy(batadv_tl_cache);
4313 kmem_cache_destroy(batadv_tg_cache);
4314 kmem_cache_destroy(batadv_tt_orig_cache);
4315 kmem_cache_destroy(batadv_tt_change_cache);
4316 kmem_cache_destroy(batadv_tt_req_cache);
4317 kmem_cache_destroy(batadv_tt_roam_cache);