GNU Linux-libre 4.19.211-gnu1
[releases.git] / net / batman-adv / translation-table.c
1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2007-2018  B.A.T.M.A.N. contributors:
3  *
4  * Marek Lindner, Simon Wunderlich, Antonio Quartulli
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of version 2 of the GNU General Public
8  * License as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  * General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, see <http://www.gnu.org/licenses/>.
17  */
18
19 #include "translation-table.h"
20 #include "main.h"
21
22 #include <linux/atomic.h>
23 #include <linux/bitops.h>
24 #include <linux/build_bug.h>
25 #include <linux/byteorder/generic.h>
26 #include <linux/cache.h>
27 #include <linux/compiler.h>
28 #include <linux/crc32c.h>
29 #include <linux/errno.h>
30 #include <linux/etherdevice.h>
31 #include <linux/gfp.h>
32 #include <linux/if_ether.h>
33 #include <linux/init.h>
34 #include <linux/jhash.h>
35 #include <linux/jiffies.h>
36 #include <linux/kernel.h>
37 #include <linux/kref.h>
38 #include <linux/list.h>
39 #include <linux/lockdep.h>
40 #include <linux/net.h>
41 #include <linux/netdevice.h>
42 #include <linux/netlink.h>
43 #include <linux/rculist.h>
44 #include <linux/rcupdate.h>
45 #include <linux/seq_file.h>
46 #include <linux/skbuff.h>
47 #include <linux/slab.h>
48 #include <linux/spinlock.h>
49 #include <linux/stddef.h>
50 #include <linux/string.h>
51 #include <linux/workqueue.h>
52 #include <net/genetlink.h>
53 #include <net/netlink.h>
54 #include <net/sock.h>
55 #include <uapi/linux/batadv_packet.h>
56 #include <uapi/linux/batman_adv.h>
57
58 #include "bridge_loop_avoidance.h"
59 #include "hard-interface.h"
60 #include "hash.h"
61 #include "log.h"
62 #include "netlink.h"
63 #include "originator.h"
64 #include "soft-interface.h"
65 #include "tvlv.h"
66
67 static struct kmem_cache *batadv_tl_cache __read_mostly;
68 static struct kmem_cache *batadv_tg_cache __read_mostly;
69 static struct kmem_cache *batadv_tt_orig_cache __read_mostly;
70 static struct kmem_cache *batadv_tt_change_cache __read_mostly;
71 static struct kmem_cache *batadv_tt_req_cache __read_mostly;
72 static struct kmem_cache *batadv_tt_roam_cache __read_mostly;
73
74 /* hash class keys */
75 static struct lock_class_key batadv_tt_local_hash_lock_class_key;
76 static struct lock_class_key batadv_tt_global_hash_lock_class_key;
77
78 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
79                                  unsigned short vid,
80                                  struct batadv_orig_node *orig_node);
81 static void batadv_tt_purge(struct work_struct *work);
82 static void
83 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
84 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
85                                  struct batadv_orig_node *orig_node,
86                                  const unsigned char *addr,
87                                  unsigned short vid, const char *message,
88                                  bool roaming);
89
90 /**
91  * batadv_compare_tt() - check if two TT entries are the same
92  * @node: the list element pointer of the first TT entry
93  * @data2: pointer to the tt_common_entry of the second TT entry
94  *
95  * Compare the MAC address and the VLAN ID of the two TT entries and check if
96  * they are the same TT client.
97  * Return: true if the two TT clients are the same, false otherwise
98  */
99 static bool batadv_compare_tt(const struct hlist_node *node, const void *data2)
100 {
101         const void *data1 = container_of(node, struct batadv_tt_common_entry,
102                                          hash_entry);
103         const struct batadv_tt_common_entry *tt1 = data1;
104         const struct batadv_tt_common_entry *tt2 = data2;
105
106         return (tt1->vid == tt2->vid) && batadv_compare_eth(data1, data2);
107 }
108
109 /**
110  * batadv_choose_tt() - return the index of the tt entry in the hash table
111  * @data: pointer to the tt_common_entry object to map
112  * @size: the size of the hash table
113  *
114  * Return: the hash index where the object represented by 'data' should be
115  * stored at.
116  */
117 static inline u32 batadv_choose_tt(const void *data, u32 size)
118 {
119         struct batadv_tt_common_entry *tt;
120         u32 hash = 0;
121
122         tt = (struct batadv_tt_common_entry *)data;
123         hash = jhash(&tt->addr, ETH_ALEN, hash);
124         hash = jhash(&tt->vid, sizeof(tt->vid), hash);
125
126         return hash % size;
127 }
128
129 /**
130  * batadv_tt_hash_find() - look for a client in the given hash table
131  * @hash: the hash table to search
132  * @addr: the mac address of the client to look for
133  * @vid: VLAN identifier
134  *
135  * Return: a pointer to the tt_common struct belonging to the searched client if
136  * found, NULL otherwise.
137  */
138 static struct batadv_tt_common_entry *
139 batadv_tt_hash_find(struct batadv_hashtable *hash, const u8 *addr,
140                     unsigned short vid)
141 {
142         struct hlist_head *head;
143         struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL;
144         u32 index;
145
146         if (!hash)
147                 return NULL;
148
149         ether_addr_copy(to_search.addr, addr);
150         to_search.vid = vid;
151
152         index = batadv_choose_tt(&to_search, hash->size);
153         head = &hash->table[index];
154
155         rcu_read_lock();
156         hlist_for_each_entry_rcu(tt, head, hash_entry) {
157                 if (!batadv_compare_eth(tt, addr))
158                         continue;
159
160                 if (tt->vid != vid)
161                         continue;
162
163                 if (!kref_get_unless_zero(&tt->refcount))
164                         continue;
165
166                 tt_tmp = tt;
167                 break;
168         }
169         rcu_read_unlock();
170
171         return tt_tmp;
172 }
173
174 /**
175  * batadv_tt_local_hash_find() - search the local table for a given client
176  * @bat_priv: the bat priv with all the soft interface information
177  * @addr: the mac address of the client to look for
178  * @vid: VLAN identifier
179  *
180  * Return: a pointer to the corresponding tt_local_entry struct if the client is
181  * found, NULL otherwise.
182  */
183 static struct batadv_tt_local_entry *
184 batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
185                           unsigned short vid)
186 {
187         struct batadv_tt_common_entry *tt_common_entry;
188         struct batadv_tt_local_entry *tt_local_entry = NULL;
189
190         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, addr,
191                                               vid);
192         if (tt_common_entry)
193                 tt_local_entry = container_of(tt_common_entry,
194                                               struct batadv_tt_local_entry,
195                                               common);
196         return tt_local_entry;
197 }
198
199 /**
200  * batadv_tt_global_hash_find() - search the global table for a given client
201  * @bat_priv: the bat priv with all the soft interface information
202  * @addr: the mac address of the client to look for
203  * @vid: VLAN identifier
204  *
205  * Return: a pointer to the corresponding tt_global_entry struct if the client
206  * is found, NULL otherwise.
207  */
208 static struct batadv_tt_global_entry *
209 batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
210                            unsigned short vid)
211 {
212         struct batadv_tt_common_entry *tt_common_entry;
213         struct batadv_tt_global_entry *tt_global_entry = NULL;
214
215         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, addr,
216                                               vid);
217         if (tt_common_entry)
218                 tt_global_entry = container_of(tt_common_entry,
219                                                struct batadv_tt_global_entry,
220                                                common);
221         return tt_global_entry;
222 }
223
224 /**
225  * batadv_tt_local_entry_free_rcu() - free the tt_local_entry
226  * @rcu: rcu pointer of the tt_local_entry
227  */
228 static void batadv_tt_local_entry_free_rcu(struct rcu_head *rcu)
229 {
230         struct batadv_tt_local_entry *tt_local_entry;
231
232         tt_local_entry = container_of(rcu, struct batadv_tt_local_entry,
233                                       common.rcu);
234
235         kmem_cache_free(batadv_tl_cache, tt_local_entry);
236 }
237
238 /**
239  * batadv_tt_local_entry_release() - release tt_local_entry from lists and queue
240  *  for free after rcu grace period
241  * @ref: kref pointer of the nc_node
242  */
243 static void batadv_tt_local_entry_release(struct kref *ref)
244 {
245         struct batadv_tt_local_entry *tt_local_entry;
246
247         tt_local_entry = container_of(ref, struct batadv_tt_local_entry,
248                                       common.refcount);
249
250         batadv_softif_vlan_put(tt_local_entry->vlan);
251
252         call_rcu(&tt_local_entry->common.rcu, batadv_tt_local_entry_free_rcu);
253 }
254
255 /**
256  * batadv_tt_local_entry_put() - decrement the tt_local_entry refcounter and
257  *  possibly release it
258  * @tt_local_entry: tt_local_entry to be free'd
259  */
260 static void
261 batadv_tt_local_entry_put(struct batadv_tt_local_entry *tt_local_entry)
262 {
263         kref_put(&tt_local_entry->common.refcount,
264                  batadv_tt_local_entry_release);
265 }
266
267 /**
268  * batadv_tt_global_entry_free_rcu() - free the tt_global_entry
269  * @rcu: rcu pointer of the tt_global_entry
270  */
271 static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu)
272 {
273         struct batadv_tt_global_entry *tt_global_entry;
274
275         tt_global_entry = container_of(rcu, struct batadv_tt_global_entry,
276                                        common.rcu);
277
278         kmem_cache_free(batadv_tg_cache, tt_global_entry);
279 }
280
281 /**
282  * batadv_tt_global_entry_release() - release tt_global_entry from lists and
283  *  queue for free after rcu grace period
284  * @ref: kref pointer of the nc_node
285  */
286 static void batadv_tt_global_entry_release(struct kref *ref)
287 {
288         struct batadv_tt_global_entry *tt_global_entry;
289
290         tt_global_entry = container_of(ref, struct batadv_tt_global_entry,
291                                        common.refcount);
292
293         batadv_tt_global_del_orig_list(tt_global_entry);
294
295         call_rcu(&tt_global_entry->common.rcu, batadv_tt_global_entry_free_rcu);
296 }
297
298 /**
299  * batadv_tt_global_entry_put() - decrement the tt_global_entry refcounter and
300  *  possibly release it
301  * @tt_global_entry: tt_global_entry to be free'd
302  */
303 static void
304 batadv_tt_global_entry_put(struct batadv_tt_global_entry *tt_global_entry)
305 {
306         kref_put(&tt_global_entry->common.refcount,
307                  batadv_tt_global_entry_release);
308 }
309
310 /**
311  * batadv_tt_global_hash_count() - count the number of orig entries
312  * @bat_priv: the bat priv with all the soft interface information
313  * @addr: the mac address of the client to count entries for
314  * @vid: VLAN identifier
315  *
316  * Return: the number of originators advertising the given address/data
317  * (excluding ourself).
318  */
319 int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
320                                 const u8 *addr, unsigned short vid)
321 {
322         struct batadv_tt_global_entry *tt_global_entry;
323         int count;
324
325         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
326         if (!tt_global_entry)
327                 return 0;
328
329         count = atomic_read(&tt_global_entry->orig_list_count);
330         batadv_tt_global_entry_put(tt_global_entry);
331
332         return count;
333 }
334
335 /**
336  * batadv_tt_local_size_mod() - change the size by v of the local table
337  *  identified by vid
338  * @bat_priv: the bat priv with all the soft interface information
339  * @vid: the VLAN identifier of the sub-table to change
340  * @v: the amount to sum to the local table size
341  */
342 static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
343                                      unsigned short vid, int v)
344 {
345         struct batadv_softif_vlan *vlan;
346
347         vlan = batadv_softif_vlan_get(bat_priv, vid);
348         if (!vlan)
349                 return;
350
351         atomic_add(v, &vlan->tt.num_entries);
352
353         batadv_softif_vlan_put(vlan);
354 }
355
356 /**
357  * batadv_tt_local_size_inc() - increase by one the local table size for the
358  *  given vid
359  * @bat_priv: the bat priv with all the soft interface information
360  * @vid: the VLAN identifier
361  */
362 static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv,
363                                      unsigned short vid)
364 {
365         batadv_tt_local_size_mod(bat_priv, vid, 1);
366 }
367
368 /**
369  * batadv_tt_local_size_dec() - decrease by one the local table size for the
370  *  given vid
371  * @bat_priv: the bat priv with all the soft interface information
372  * @vid: the VLAN identifier
373  */
374 static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv,
375                                      unsigned short vid)
376 {
377         batadv_tt_local_size_mod(bat_priv, vid, -1);
378 }
379
380 /**
381  * batadv_tt_global_size_mod() - change the size by v of the global table
382  *  for orig_node identified by vid
383  * @orig_node: the originator for which the table has to be modified
384  * @vid: the VLAN identifier
385  * @v: the amount to sum to the global table size
386  */
387 static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node,
388                                       unsigned short vid, int v)
389 {
390         struct batadv_orig_node_vlan *vlan;
391
392         vlan = batadv_orig_node_vlan_new(orig_node, vid);
393         if (!vlan)
394                 return;
395
396         if (atomic_add_return(v, &vlan->tt.num_entries) == 0) {
397                 spin_lock_bh(&orig_node->vlan_list_lock);
398                 if (!hlist_unhashed(&vlan->list)) {
399                         hlist_del_init_rcu(&vlan->list);
400                         batadv_orig_node_vlan_put(vlan);
401                 }
402                 spin_unlock_bh(&orig_node->vlan_list_lock);
403         }
404
405         batadv_orig_node_vlan_put(vlan);
406 }
407
408 /**
409  * batadv_tt_global_size_inc() - increase by one the global table size for the
410  *  given vid
411  * @orig_node: the originator which global table size has to be decreased
412  * @vid: the vlan identifier
413  */
414 static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
415                                       unsigned short vid)
416 {
417         batadv_tt_global_size_mod(orig_node, vid, 1);
418 }
419
420 /**
421  * batadv_tt_global_size_dec() - decrease by one the global table size for the
422  *  given vid
423  * @orig_node: the originator which global table size has to be decreased
424  * @vid: the vlan identifier
425  */
426 static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
427                                       unsigned short vid)
428 {
429         batadv_tt_global_size_mod(orig_node, vid, -1);
430 }
431
432 /**
433  * batadv_tt_orig_list_entry_free_rcu() - free the orig_entry
434  * @rcu: rcu pointer of the orig_entry
435  */
436 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
437 {
438         struct batadv_tt_orig_list_entry *orig_entry;
439
440         orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu);
441
442         kmem_cache_free(batadv_tt_orig_cache, orig_entry);
443 }
444
445 /**
446  * batadv_tt_orig_list_entry_release() - release tt orig entry from lists and
447  *  queue for free after rcu grace period
448  * @ref: kref pointer of the tt orig entry
449  */
450 static void batadv_tt_orig_list_entry_release(struct kref *ref)
451 {
452         struct batadv_tt_orig_list_entry *orig_entry;
453
454         orig_entry = container_of(ref, struct batadv_tt_orig_list_entry,
455                                   refcount);
456
457         batadv_orig_node_put(orig_entry->orig_node);
458         call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
459 }
460
461 /**
462  * batadv_tt_orig_list_entry_put() - decrement the tt orig entry refcounter and
463  *  possibly release it
464  * @orig_entry: tt orig entry to be free'd
465  */
466 static void
467 batadv_tt_orig_list_entry_put(struct batadv_tt_orig_list_entry *orig_entry)
468 {
469         kref_put(&orig_entry->refcount, batadv_tt_orig_list_entry_release);
470 }
471
472 /**
473  * batadv_tt_local_event() - store a local TT event (ADD/DEL)
474  * @bat_priv: the bat priv with all the soft interface information
475  * @tt_local_entry: the TT entry involved in the event
476  * @event_flags: flags to store in the event structure
477  */
478 static void batadv_tt_local_event(struct batadv_priv *bat_priv,
479                                   struct batadv_tt_local_entry *tt_local_entry,
480                                   u8 event_flags)
481 {
482         struct batadv_tt_change_node *tt_change_node, *entry, *safe;
483         struct batadv_tt_common_entry *common = &tt_local_entry->common;
484         u8 flags = common->flags | event_flags;
485         bool event_removed = false;
486         bool del_op_requested, del_op_entry;
487
488         tt_change_node = kmem_cache_alloc(batadv_tt_change_cache, GFP_ATOMIC);
489         if (!tt_change_node)
490                 return;
491
492         tt_change_node->change.flags = flags;
493         memset(tt_change_node->change.reserved, 0,
494                sizeof(tt_change_node->change.reserved));
495         ether_addr_copy(tt_change_node->change.addr, common->addr);
496         tt_change_node->change.vid = htons(common->vid);
497
498         del_op_requested = flags & BATADV_TT_CLIENT_DEL;
499
500         /* check for ADD+DEL or DEL+ADD events */
501         spin_lock_bh(&bat_priv->tt.changes_list_lock);
502         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
503                                  list) {
504                 if (!batadv_compare_eth(entry->change.addr, common->addr))
505                         continue;
506
507                 /* DEL+ADD in the same orig interval have no effect and can be
508                  * removed to avoid silly behaviour on the receiver side. The
509                  * other way around (ADD+DEL) can happen in case of roaming of
510                  * a client still in the NEW state. Roaming of NEW clients is
511                  * now possible due to automatically recognition of "temporary"
512                  * clients
513                  */
514                 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
515                 if (!del_op_requested && del_op_entry)
516                         goto del;
517                 if (del_op_requested && !del_op_entry)
518                         goto del;
519
520                 /* this is a second add in the same originator interval. It
521                  * means that flags have been changed: update them!
522                  */
523                 if (!del_op_requested && !del_op_entry)
524                         entry->change.flags = flags;
525
526                 continue;
527 del:
528                 list_del(&entry->list);
529                 kmem_cache_free(batadv_tt_change_cache, entry);
530                 kmem_cache_free(batadv_tt_change_cache, tt_change_node);
531                 event_removed = true;
532                 goto unlock;
533         }
534
535         /* track the change in the OGMinterval list */
536         list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
537
538 unlock:
539         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
540
541         if (event_removed)
542                 atomic_dec(&bat_priv->tt.local_changes);
543         else
544                 atomic_inc(&bat_priv->tt.local_changes);
545 }
546
547 /**
548  * batadv_tt_len() - compute length in bytes of given number of tt changes
549  * @changes_num: number of tt changes
550  *
551  * Return: computed length in bytes.
552  */
553 static int batadv_tt_len(int changes_num)
554 {
555         return changes_num * sizeof(struct batadv_tvlv_tt_change);
556 }
557
558 /**
559  * batadv_tt_entries() - compute the number of entries fitting in tt_len bytes
560  * @tt_len: available space
561  *
562  * Return: the number of entries.
563  */
564 static u16 batadv_tt_entries(u16 tt_len)
565 {
566         return tt_len / batadv_tt_len(1);
567 }
568
569 /**
570  * batadv_tt_local_table_transmit_size() - calculates the local translation
571  *  table size when transmitted over the air
572  * @bat_priv: the bat priv with all the soft interface information
573  *
574  * Return: local translation table size in bytes.
575  */
576 static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
577 {
578         u16 num_vlan = 0;
579         u16 tt_local_entries = 0;
580         struct batadv_softif_vlan *vlan;
581         int hdr_size;
582
583         rcu_read_lock();
584         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
585                 num_vlan++;
586                 tt_local_entries += atomic_read(&vlan->tt.num_entries);
587         }
588         rcu_read_unlock();
589
590         /* header size of tvlv encapsulated tt response payload */
591         hdr_size = sizeof(struct batadv_unicast_tvlv_packet);
592         hdr_size += sizeof(struct batadv_tvlv_hdr);
593         hdr_size += sizeof(struct batadv_tvlv_tt_data);
594         hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data);
595
596         return hdr_size + batadv_tt_len(tt_local_entries);
597 }
598
599 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
600 {
601         if (bat_priv->tt.local_hash)
602                 return 0;
603
604         bat_priv->tt.local_hash = batadv_hash_new(1024);
605
606         if (!bat_priv->tt.local_hash)
607                 return -ENOMEM;
608
609         batadv_hash_set_lock_class(bat_priv->tt.local_hash,
610                                    &batadv_tt_local_hash_lock_class_key);
611
612         return 0;
613 }
614
615 static void batadv_tt_global_free(struct batadv_priv *bat_priv,
616                                   struct batadv_tt_global_entry *tt_global,
617                                   const char *message)
618 {
619         struct batadv_tt_global_entry *tt_removed_entry;
620         struct hlist_node *tt_removed_node;
621
622         batadv_dbg(BATADV_DBG_TT, bat_priv,
623                    "Deleting global tt entry %pM (vid: %d): %s\n",
624                    tt_global->common.addr,
625                    batadv_print_vid(tt_global->common.vid), message);
626
627         tt_removed_node = batadv_hash_remove(bat_priv->tt.global_hash,
628                                              batadv_compare_tt,
629                                              batadv_choose_tt,
630                                              &tt_global->common);
631         if (!tt_removed_node)
632                 return;
633
634         /* drop reference of remove hash entry */
635         tt_removed_entry = hlist_entry(tt_removed_node,
636                                        struct batadv_tt_global_entry,
637                                        common.hash_entry);
638         batadv_tt_global_entry_put(tt_removed_entry);
639 }
640
641 /**
642  * batadv_tt_local_add() - add a new client to the local table or update an
643  *  existing client
644  * @soft_iface: netdev struct of the mesh interface
645  * @addr: the mac address of the client to add
646  * @vid: VLAN identifier
647  * @ifindex: index of the interface where the client is connected to (useful to
648  *  identify wireless clients)
649  * @mark: the value contained in the skb->mark field of the received packet (if
650  *  any)
651  *
652  * Return: true if the client was successfully added, false otherwise.
653  */
654 bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
655                          unsigned short vid, int ifindex, u32 mark)
656 {
657         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
658         struct batadv_tt_local_entry *tt_local;
659         struct batadv_tt_global_entry *tt_global = NULL;
660         struct net *net = dev_net(soft_iface);
661         struct batadv_softif_vlan *vlan;
662         struct net_device *in_dev = NULL;
663         struct batadv_hard_iface *in_hardif = NULL;
664         struct hlist_head *head;
665         struct batadv_tt_orig_list_entry *orig_entry;
666         int hash_added, table_size, packet_size_max;
667         bool ret = false;
668         bool roamed_back = false;
669         u8 remote_flags;
670         u32 match_mark;
671
672         if (ifindex != BATADV_NULL_IFINDEX)
673                 in_dev = dev_get_by_index(net, ifindex);
674
675         if (in_dev)
676                 in_hardif = batadv_hardif_get_by_netdev(in_dev);
677
678         tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
679
680         if (!is_multicast_ether_addr(addr))
681                 tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
682
683         if (tt_local) {
684                 tt_local->last_seen = jiffies;
685                 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
686                         batadv_dbg(BATADV_DBG_TT, bat_priv,
687                                    "Re-adding pending client %pM (vid: %d)\n",
688                                    addr, batadv_print_vid(vid));
689                         /* whatever the reason why the PENDING flag was set,
690                          * this is a client which was enqueued to be removed in
691                          * this orig_interval. Since it popped up again, the
692                          * flag can be reset like it was never enqueued
693                          */
694                         tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
695                         goto add_event;
696                 }
697
698                 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
699                         batadv_dbg(BATADV_DBG_TT, bat_priv,
700                                    "Roaming client %pM (vid: %d) came back to its original location\n",
701                                    addr, batadv_print_vid(vid));
702                         /* the ROAM flag is set because this client roamed away
703                          * and the node got a roaming_advertisement message. Now
704                          * that the client popped up again at its original
705                          * location such flag can be unset
706                          */
707                         tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
708                         roamed_back = true;
709                 }
710                 goto check_roaming;
711         }
712
713         /* Ignore the client if we cannot send it in a full table response. */
714         table_size = batadv_tt_local_table_transmit_size(bat_priv);
715         table_size += batadv_tt_len(1);
716         packet_size_max = atomic_read(&bat_priv->packet_size_max);
717         if (table_size > packet_size_max) {
718                 net_ratelimited_function(batadv_info, soft_iface,
719                                          "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
720                                          table_size, packet_size_max, addr);
721                 goto out;
722         }
723
724         tt_local = kmem_cache_alloc(batadv_tl_cache, GFP_ATOMIC);
725         if (!tt_local)
726                 goto out;
727
728         /* increase the refcounter of the related vlan */
729         vlan = batadv_softif_vlan_get(bat_priv, vid);
730         if (!vlan) {
731                 net_ratelimited_function(batadv_info, soft_iface,
732                                          "adding TT local entry %pM to non-existent VLAN %d\n",
733                                          addr, batadv_print_vid(vid));
734                 kmem_cache_free(batadv_tl_cache, tt_local);
735                 tt_local = NULL;
736                 goto out;
737         }
738
739         batadv_dbg(BATADV_DBG_TT, bat_priv,
740                    "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
741                    addr, batadv_print_vid(vid),
742                    (u8)atomic_read(&bat_priv->tt.vn));
743
744         ether_addr_copy(tt_local->common.addr, addr);
745         /* The local entry has to be marked as NEW to avoid to send it in
746          * a full table response going out before the next ttvn increment
747          * (consistency check)
748          */
749         tt_local->common.flags = BATADV_TT_CLIENT_NEW;
750         tt_local->common.vid = vid;
751         if (batadv_is_wifi_hardif(in_hardif))
752                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
753         kref_init(&tt_local->common.refcount);
754         tt_local->last_seen = jiffies;
755         tt_local->common.added_at = tt_local->last_seen;
756         tt_local->vlan = vlan;
757
758         /* the batman interface mac and multicast addresses should never be
759          * purged
760          */
761         if (batadv_compare_eth(addr, soft_iface->dev_addr) ||
762             is_multicast_ether_addr(addr))
763                 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
764
765         kref_get(&tt_local->common.refcount);
766         hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
767                                      batadv_choose_tt, &tt_local->common,
768                                      &tt_local->common.hash_entry);
769
770         if (unlikely(hash_added != 0)) {
771                 /* remove the reference for the hash */
772                 batadv_tt_local_entry_put(tt_local);
773                 goto out;
774         }
775
776 add_event:
777         batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
778
779 check_roaming:
780         /* Check whether it is a roaming, but don't do anything if the roaming
781          * process has already been handled
782          */
783         if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
784                 /* These node are probably going to update their tt table */
785                 head = &tt_global->orig_list;
786                 rcu_read_lock();
787                 hlist_for_each_entry_rcu(orig_entry, head, list) {
788                         batadv_send_roam_adv(bat_priv, tt_global->common.addr,
789                                              tt_global->common.vid,
790                                              orig_entry->orig_node);
791                 }
792                 rcu_read_unlock();
793                 if (roamed_back) {
794                         batadv_tt_global_free(bat_priv, tt_global,
795                                               "Roaming canceled");
796                         tt_global = NULL;
797                 } else {
798                         /* The global entry has to be marked as ROAMING and
799                          * has to be kept for consistency purpose
800                          */
801                         tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
802                         tt_global->roam_at = jiffies;
803                 }
804         }
805
806         /* store the current remote flags before altering them. This helps
807          * understanding is flags are changing or not
808          */
809         remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK;
810
811         if (batadv_is_wifi_hardif(in_hardif))
812                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
813         else
814                 tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI;
815
816         /* check the mark in the skb: if it's equal to the configured
817          * isolation_mark, it means the packet is coming from an isolated
818          * non-mesh client
819          */
820         match_mark = (mark & bat_priv->isolation_mark_mask);
821         if (bat_priv->isolation_mark_mask &&
822             match_mark == bat_priv->isolation_mark)
823                 tt_local->common.flags |= BATADV_TT_CLIENT_ISOLA;
824         else
825                 tt_local->common.flags &= ~BATADV_TT_CLIENT_ISOLA;
826
827         /* if any "dynamic" flag has been modified, resend an ADD event for this
828          * entry so that all the nodes can get the new flags
829          */
830         if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
831                 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
832
833         ret = true;
834 out:
835         if (in_hardif)
836                 batadv_hardif_put(in_hardif);
837         if (in_dev)
838                 dev_put(in_dev);
839         if (tt_local)
840                 batadv_tt_local_entry_put(tt_local);
841         if (tt_global)
842                 batadv_tt_global_entry_put(tt_global);
843         return ret;
844 }
845
846 /**
847  * batadv_tt_prepare_tvlv_global_data() - prepare the TVLV TT header to send
848  *  within a TT Response directed to another node
849  * @orig_node: originator for which the TT data has to be prepared
850  * @tt_data: uninitialised pointer to the address of the TVLV buffer
851  * @tt_change: uninitialised pointer to the address of the area where the TT
852  *  changed can be stored
853  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
854  *  function reserves the amount of space needed to send the entire global TT
855  *  table. In case of success the value is updated with the real amount of
856  *  reserved bytes
857  * Allocate the needed amount of memory for the entire TT TVLV and write its
858  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
859  * objects, one per active VLAN served by the originator node.
860  *
861  * Return: the size of the allocated buffer or 0 in case of failure.
862  */
863 static u16
864 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
865                                    struct batadv_tvlv_tt_data **tt_data,
866                                    struct batadv_tvlv_tt_change **tt_change,
867                                    s32 *tt_len)
868 {
869         u16 num_vlan = 0;
870         u16 num_entries = 0;
871         u16 change_offset;
872         u16 tvlv_len;
873         struct batadv_tvlv_tt_vlan_data *tt_vlan;
874         struct batadv_orig_node_vlan *vlan;
875         u8 *tt_change_ptr;
876
877         spin_lock_bh(&orig_node->vlan_list_lock);
878         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
879                 num_vlan++;
880                 num_entries += atomic_read(&vlan->tt.num_entries);
881         }
882
883         change_offset = sizeof(**tt_data);
884         change_offset += num_vlan * sizeof(*tt_vlan);
885
886         /* if tt_len is negative, allocate the space needed by the full table */
887         if (*tt_len < 0)
888                 *tt_len = batadv_tt_len(num_entries);
889
890         tvlv_len = *tt_len;
891         tvlv_len += change_offset;
892
893         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
894         if (!*tt_data) {
895                 *tt_len = 0;
896                 goto out;
897         }
898
899         (*tt_data)->flags = BATADV_NO_FLAGS;
900         (*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
901         (*tt_data)->num_vlan = htons(num_vlan);
902
903         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
904         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
905                 tt_vlan->vid = htons(vlan->vid);
906                 tt_vlan->crc = htonl(vlan->tt.crc);
907                 tt_vlan->reserved = 0;
908
909                 tt_vlan++;
910         }
911
912         tt_change_ptr = (u8 *)*tt_data + change_offset;
913         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
914
915 out:
916         spin_unlock_bh(&orig_node->vlan_list_lock);
917         return tvlv_len;
918 }
919
920 /**
921  * batadv_tt_prepare_tvlv_local_data() - allocate and prepare the TT TVLV for
922  *  this node
923  * @bat_priv: the bat priv with all the soft interface information
924  * @tt_data: uninitialised pointer to the address of the TVLV buffer
925  * @tt_change: uninitialised pointer to the address of the area where the TT
926  *  changes can be stored
927  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
928  *  function reserves the amount of space needed to send the entire local TT
929  *  table. In case of success the value is updated with the real amount of
930  *  reserved bytes
931  *
932  * Allocate the needed amount of memory for the entire TT TVLV and write its
933  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
934  * objects, one per active VLAN.
935  *
936  * Return: the size of the allocated buffer or 0 in case of failure.
937  */
938 static u16
939 batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
940                                   struct batadv_tvlv_tt_data **tt_data,
941                                   struct batadv_tvlv_tt_change **tt_change,
942                                   s32 *tt_len)
943 {
944         struct batadv_tvlv_tt_vlan_data *tt_vlan;
945         struct batadv_softif_vlan *vlan;
946         u16 num_vlan = 0;
947         u16 vlan_entries = 0;
948         u16 total_entries = 0;
949         u16 tvlv_len;
950         u8 *tt_change_ptr;
951         int change_offset;
952
953         spin_lock_bh(&bat_priv->softif_vlan_list_lock);
954         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
955                 vlan_entries = atomic_read(&vlan->tt.num_entries);
956                 if (vlan_entries < 1)
957                         continue;
958
959                 num_vlan++;
960                 total_entries += vlan_entries;
961         }
962
963         change_offset = sizeof(**tt_data);
964         change_offset += num_vlan * sizeof(*tt_vlan);
965
966         /* if tt_len is negative, allocate the space needed by the full table */
967         if (*tt_len < 0)
968                 *tt_len = batadv_tt_len(total_entries);
969
970         tvlv_len = *tt_len;
971         tvlv_len += change_offset;
972
973         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
974         if (!*tt_data) {
975                 tvlv_len = 0;
976                 goto out;
977         }
978
979         (*tt_data)->flags = BATADV_NO_FLAGS;
980         (*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
981         (*tt_data)->num_vlan = htons(num_vlan);
982
983         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
984         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
985                 vlan_entries = atomic_read(&vlan->tt.num_entries);
986                 if (vlan_entries < 1)
987                         continue;
988
989                 tt_vlan->vid = htons(vlan->vid);
990                 tt_vlan->crc = htonl(vlan->tt.crc);
991                 tt_vlan->reserved = 0;
992
993                 tt_vlan++;
994         }
995
996         tt_change_ptr = (u8 *)*tt_data + change_offset;
997         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
998
999 out:
1000         spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
1001         return tvlv_len;
1002 }
1003
1004 /**
1005  * batadv_tt_tvlv_container_update() - update the translation table tvlv
1006  *  container after local tt changes have been committed
1007  * @bat_priv: the bat priv with all the soft interface information
1008  */
1009 static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
1010 {
1011         struct batadv_tt_change_node *entry, *safe;
1012         struct batadv_tvlv_tt_data *tt_data;
1013         struct batadv_tvlv_tt_change *tt_change;
1014         int tt_diff_len, tt_change_len = 0;
1015         int tt_diff_entries_num = 0;
1016         int tt_diff_entries_count = 0;
1017         u16 tvlv_len;
1018
1019         tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
1020         tt_diff_len = batadv_tt_len(tt_diff_entries_num);
1021
1022         /* if we have too many changes for one packet don't send any
1023          * and wait for the tt table request which will be fragmented
1024          */
1025         if (tt_diff_len > bat_priv->soft_iface->mtu)
1026                 tt_diff_len = 0;
1027
1028         tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
1029                                                      &tt_change, &tt_diff_len);
1030         if (!tvlv_len)
1031                 return;
1032
1033         tt_data->flags = BATADV_TT_OGM_DIFF;
1034
1035         if (tt_diff_len == 0)
1036                 goto container_register;
1037
1038         spin_lock_bh(&bat_priv->tt.changes_list_lock);
1039         atomic_set(&bat_priv->tt.local_changes, 0);
1040
1041         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1042                                  list) {
1043                 if (tt_diff_entries_count < tt_diff_entries_num) {
1044                         memcpy(tt_change + tt_diff_entries_count,
1045                                &entry->change,
1046                                sizeof(struct batadv_tvlv_tt_change));
1047                         tt_diff_entries_count++;
1048                 }
1049                 list_del(&entry->list);
1050                 kmem_cache_free(batadv_tt_change_cache, entry);
1051         }
1052         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1053
1054         /* Keep the buffer for possible tt_request */
1055         spin_lock_bh(&bat_priv->tt.last_changeset_lock);
1056         kfree(bat_priv->tt.last_changeset);
1057         bat_priv->tt.last_changeset_len = 0;
1058         bat_priv->tt.last_changeset = NULL;
1059         tt_change_len = batadv_tt_len(tt_diff_entries_count);
1060         /* check whether this new OGM has no changes due to size problems */
1061         if (tt_diff_entries_count > 0) {
1062                 /* if kmalloc() fails we will reply with the full table
1063                  * instead of providing the diff
1064                  */
1065                 bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
1066                 if (bat_priv->tt.last_changeset) {
1067                         memcpy(bat_priv->tt.last_changeset,
1068                                tt_change, tt_change_len);
1069                         bat_priv->tt.last_changeset_len = tt_diff_len;
1070                 }
1071         }
1072         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
1073
1074 container_register:
1075         batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
1076                                        tvlv_len);
1077         kfree(tt_data);
1078 }
1079
1080 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
1081
1082 /**
1083  * batadv_tt_local_seq_print_text() - Print the local tt table in a seq file
1084  * @seq: seq file to print on
1085  * @offset: not used
1086  *
1087  * Return: always 0
1088  */
1089 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
1090 {
1091         struct net_device *net_dev = (struct net_device *)seq->private;
1092         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1093         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1094         struct batadv_tt_common_entry *tt_common_entry;
1095         struct batadv_tt_local_entry *tt_local;
1096         struct batadv_hard_iface *primary_if;
1097         struct hlist_head *head;
1098         u32 i;
1099         int last_seen_secs;
1100         int last_seen_msecs;
1101         unsigned long last_seen_jiffies;
1102         bool no_purge;
1103         u16 np_flag = BATADV_TT_CLIENT_NOPURGE;
1104
1105         primary_if = batadv_seq_print_text_primary_if_get(seq);
1106         if (!primary_if)
1107                 goto out;
1108
1109         seq_printf(seq,
1110                    "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
1111                    net_dev->name, (u8)atomic_read(&bat_priv->tt.vn));
1112         seq_puts(seq,
1113                  "       Client         VID Flags    Last seen (CRC       )\n");
1114
1115         for (i = 0; i < hash->size; i++) {
1116                 head = &hash->table[i];
1117
1118                 rcu_read_lock();
1119                 hlist_for_each_entry_rcu(tt_common_entry,
1120                                          head, hash_entry) {
1121                         tt_local = container_of(tt_common_entry,
1122                                                 struct batadv_tt_local_entry,
1123                                                 common);
1124                         last_seen_jiffies = jiffies - tt_local->last_seen;
1125                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
1126                         last_seen_secs = last_seen_msecs / 1000;
1127                         last_seen_msecs = last_seen_msecs % 1000;
1128
1129                         no_purge = tt_common_entry->flags & np_flag;
1130                         seq_printf(seq,
1131                                    " * %pM %4i [%c%c%c%c%c%c] %3u.%03u   (%#.8x)\n",
1132                                    tt_common_entry->addr,
1133                                    batadv_print_vid(tt_common_entry->vid),
1134                                    ((tt_common_entry->flags &
1135                                      BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1136                                    no_purge ? 'P' : '.',
1137                                    ((tt_common_entry->flags &
1138                                      BATADV_TT_CLIENT_NEW) ? 'N' : '.'),
1139                                    ((tt_common_entry->flags &
1140                                      BATADV_TT_CLIENT_PENDING) ? 'X' : '.'),
1141                                    ((tt_common_entry->flags &
1142                                      BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1143                                    ((tt_common_entry->flags &
1144                                      BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1145                                    no_purge ? 0 : last_seen_secs,
1146                                    no_purge ? 0 : last_seen_msecs,
1147                                    tt_local->vlan->tt.crc);
1148                 }
1149                 rcu_read_unlock();
1150         }
1151 out:
1152         if (primary_if)
1153                 batadv_hardif_put(primary_if);
1154         return 0;
1155 }
1156 #endif
1157
1158 /**
1159  * batadv_tt_local_dump_entry() - Dump one TT local entry into a message
1160  * @msg :Netlink message to dump into
1161  * @portid: Port making netlink request
1162  * @seq: Sequence number of netlink message
1163  * @bat_priv: The bat priv with all the soft interface information
1164  * @common: tt local & tt global common data
1165  *
1166  * Return: Error code, or 0 on success
1167  */
1168 static int
1169 batadv_tt_local_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
1170                            struct batadv_priv *bat_priv,
1171                            struct batadv_tt_common_entry *common)
1172 {
1173         void *hdr;
1174         struct batadv_softif_vlan *vlan;
1175         struct batadv_tt_local_entry *local;
1176         unsigned int last_seen_msecs;
1177         u32 crc;
1178
1179         local = container_of(common, struct batadv_tt_local_entry, common);
1180         last_seen_msecs = jiffies_to_msecs(jiffies - local->last_seen);
1181
1182         vlan = batadv_softif_vlan_get(bat_priv, common->vid);
1183         if (!vlan)
1184                 return 0;
1185
1186         crc = vlan->tt.crc;
1187
1188         batadv_softif_vlan_put(vlan);
1189
1190         hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
1191                           NLM_F_MULTI,
1192                           BATADV_CMD_GET_TRANSTABLE_LOCAL);
1193         if (!hdr)
1194                 return -ENOBUFS;
1195
1196         if (nla_put(msg, BATADV_ATTR_TT_ADDRESS, ETH_ALEN, common->addr) ||
1197             nla_put_u32(msg, BATADV_ATTR_TT_CRC32, crc) ||
1198             nla_put_u16(msg, BATADV_ATTR_TT_VID, common->vid) ||
1199             nla_put_u32(msg, BATADV_ATTR_TT_FLAGS, common->flags))
1200                 goto nla_put_failure;
1201
1202         if (!(common->flags & BATADV_TT_CLIENT_NOPURGE) &&
1203             nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, last_seen_msecs))
1204                 goto nla_put_failure;
1205
1206         genlmsg_end(msg, hdr);
1207         return 0;
1208
1209  nla_put_failure:
1210         genlmsg_cancel(msg, hdr);
1211         return -EMSGSIZE;
1212 }
1213
1214 /**
1215  * batadv_tt_local_dump_bucket() - Dump one TT local bucket into a message
1216  * @msg: Netlink message to dump into
1217  * @portid: Port making netlink request
1218  * @seq: Sequence number of netlink message
1219  * @bat_priv: The bat priv with all the soft interface information
1220  * @head: Pointer to the list containing the local tt entries
1221  * @idx_s: Number of entries to skip
1222  *
1223  * Return: Error code, or 0 on success
1224  */
1225 static int
1226 batadv_tt_local_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
1227                             struct batadv_priv *bat_priv,
1228                             struct hlist_head *head, int *idx_s)
1229 {
1230         struct batadv_tt_common_entry *common;
1231         int idx = 0;
1232
1233         rcu_read_lock();
1234         hlist_for_each_entry_rcu(common, head, hash_entry) {
1235                 if (idx++ < *idx_s)
1236                         continue;
1237
1238                 if (batadv_tt_local_dump_entry(msg, portid, seq, bat_priv,
1239                                                common)) {
1240                         rcu_read_unlock();
1241                         *idx_s = idx - 1;
1242                         return -EMSGSIZE;
1243                 }
1244         }
1245         rcu_read_unlock();
1246
1247         *idx_s = 0;
1248         return 0;
1249 }
1250
1251 /**
1252  * batadv_tt_local_dump() - Dump TT local entries into a message
1253  * @msg: Netlink message to dump into
1254  * @cb: Parameters from query
1255  *
1256  * Return: Error code, or 0 on success
1257  */
1258 int batadv_tt_local_dump(struct sk_buff *msg, struct netlink_callback *cb)
1259 {
1260         struct net *net = sock_net(cb->skb->sk);
1261         struct net_device *soft_iface;
1262         struct batadv_priv *bat_priv;
1263         struct batadv_hard_iface *primary_if = NULL;
1264         struct batadv_hashtable *hash;
1265         struct hlist_head *head;
1266         int ret;
1267         int ifindex;
1268         int bucket = cb->args[0];
1269         int idx = cb->args[1];
1270         int portid = NETLINK_CB(cb->skb).portid;
1271
1272         ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
1273         if (!ifindex)
1274                 return -EINVAL;
1275
1276         soft_iface = dev_get_by_index(net, ifindex);
1277         if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
1278                 ret = -ENODEV;
1279                 goto out;
1280         }
1281
1282         bat_priv = netdev_priv(soft_iface);
1283
1284         primary_if = batadv_primary_if_get_selected(bat_priv);
1285         if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
1286                 ret = -ENOENT;
1287                 goto out;
1288         }
1289
1290         hash = bat_priv->tt.local_hash;
1291
1292         while (bucket < hash->size) {
1293                 head = &hash->table[bucket];
1294
1295                 if (batadv_tt_local_dump_bucket(msg, portid, cb->nlh->nlmsg_seq,
1296                                                 bat_priv, head, &idx))
1297                         break;
1298
1299                 bucket++;
1300         }
1301
1302         ret = msg->len;
1303
1304  out:
1305         if (primary_if)
1306                 batadv_hardif_put(primary_if);
1307         if (soft_iface)
1308                 dev_put(soft_iface);
1309
1310         cb->args[0] = bucket;
1311         cb->args[1] = idx;
1312
1313         return ret;
1314 }
1315
1316 static void
1317 batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
1318                             struct batadv_tt_local_entry *tt_local_entry,
1319                             u16 flags, const char *message)
1320 {
1321         batadv_tt_local_event(bat_priv, tt_local_entry, flags);
1322
1323         /* The local client has to be marked as "pending to be removed" but has
1324          * to be kept in the table in order to send it in a full table
1325          * response issued before the net ttvn increment (consistency check)
1326          */
1327         tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
1328
1329         batadv_dbg(BATADV_DBG_TT, bat_priv,
1330                    "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
1331                    tt_local_entry->common.addr,
1332                    batadv_print_vid(tt_local_entry->common.vid), message);
1333 }
1334
1335 /**
1336  * batadv_tt_local_remove() - logically remove an entry from the local table
1337  * @bat_priv: the bat priv with all the soft interface information
1338  * @addr: the MAC address of the client to remove
1339  * @vid: VLAN identifier
1340  * @message: message to append to the log on deletion
1341  * @roaming: true if the deletion is due to a roaming event
1342  *
1343  * Return: the flags assigned to the local entry before being deleted
1344  */
1345 u16 batadv_tt_local_remove(struct batadv_priv *bat_priv, const u8 *addr,
1346                            unsigned short vid, const char *message,
1347                            bool roaming)
1348 {
1349         struct batadv_tt_local_entry *tt_removed_entry;
1350         struct batadv_tt_local_entry *tt_local_entry;
1351         u16 flags, curr_flags = BATADV_NO_FLAGS;
1352         struct hlist_node *tt_removed_node;
1353
1354         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
1355         if (!tt_local_entry)
1356                 goto out;
1357
1358         curr_flags = tt_local_entry->common.flags;
1359
1360         flags = BATADV_TT_CLIENT_DEL;
1361         /* if this global entry addition is due to a roaming, the node has to
1362          * mark the local entry as "roamed" in order to correctly reroute
1363          * packets later
1364          */
1365         if (roaming) {
1366                 flags |= BATADV_TT_CLIENT_ROAM;
1367                 /* mark the local client as ROAMed */
1368                 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1369         }
1370
1371         if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
1372                 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
1373                                             message);
1374                 goto out;
1375         }
1376         /* if this client has been added right now, it is possible to
1377          * immediately purge it
1378          */
1379         batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL);
1380
1381         tt_removed_node = batadv_hash_remove(bat_priv->tt.local_hash,
1382                                              batadv_compare_tt,
1383                                              batadv_choose_tt,
1384                                              &tt_local_entry->common);
1385         if (!tt_removed_node)
1386                 goto out;
1387
1388         /* drop reference of remove hash entry */
1389         tt_removed_entry = hlist_entry(tt_removed_node,
1390                                        struct batadv_tt_local_entry,
1391                                        common.hash_entry);
1392         batadv_tt_local_entry_put(tt_removed_entry);
1393
1394 out:
1395         if (tt_local_entry)
1396                 batadv_tt_local_entry_put(tt_local_entry);
1397
1398         return curr_flags;
1399 }
1400
1401 /**
1402  * batadv_tt_local_purge_list() - purge inactive tt local entries
1403  * @bat_priv: the bat priv with all the soft interface information
1404  * @head: pointer to the list containing the local tt entries
1405  * @timeout: parameter deciding whether a given tt local entry is considered
1406  *  inactive or not
1407  */
1408 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
1409                                        struct hlist_head *head,
1410                                        int timeout)
1411 {
1412         struct batadv_tt_local_entry *tt_local_entry;
1413         struct batadv_tt_common_entry *tt_common_entry;
1414         struct hlist_node *node_tmp;
1415
1416         hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
1417                                   hash_entry) {
1418                 tt_local_entry = container_of(tt_common_entry,
1419                                               struct batadv_tt_local_entry,
1420                                               common);
1421                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
1422                         continue;
1423
1424                 /* entry already marked for deletion */
1425                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
1426                         continue;
1427
1428                 if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout))
1429                         continue;
1430
1431                 batadv_tt_local_set_pending(bat_priv, tt_local_entry,
1432                                             BATADV_TT_CLIENT_DEL, "timed out");
1433         }
1434 }
1435
1436 /**
1437  * batadv_tt_local_purge() - purge inactive tt local entries
1438  * @bat_priv: the bat priv with all the soft interface information
1439  * @timeout: parameter deciding whether a given tt local entry is considered
1440  *  inactive or not
1441  */
1442 static void batadv_tt_local_purge(struct batadv_priv *bat_priv,
1443                                   int timeout)
1444 {
1445         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1446         struct hlist_head *head;
1447         spinlock_t *list_lock; /* protects write access to the hash lists */
1448         u32 i;
1449
1450         for (i = 0; i < hash->size; i++) {
1451                 head = &hash->table[i];
1452                 list_lock = &hash->list_locks[i];
1453
1454                 spin_lock_bh(list_lock);
1455                 batadv_tt_local_purge_list(bat_priv, head, timeout);
1456                 spin_unlock_bh(list_lock);
1457         }
1458 }
1459
1460 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
1461 {
1462         struct batadv_hashtable *hash;
1463         spinlock_t *list_lock; /* protects write access to the hash lists */
1464         struct batadv_tt_common_entry *tt_common_entry;
1465         struct batadv_tt_local_entry *tt_local;
1466         struct hlist_node *node_tmp;
1467         struct hlist_head *head;
1468         u32 i;
1469
1470         if (!bat_priv->tt.local_hash)
1471                 return;
1472
1473         hash = bat_priv->tt.local_hash;
1474
1475         for (i = 0; i < hash->size; i++) {
1476                 head = &hash->table[i];
1477                 list_lock = &hash->list_locks[i];
1478
1479                 spin_lock_bh(list_lock);
1480                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1481                                           head, hash_entry) {
1482                         hlist_del_rcu(&tt_common_entry->hash_entry);
1483                         tt_local = container_of(tt_common_entry,
1484                                                 struct batadv_tt_local_entry,
1485                                                 common);
1486
1487                         batadv_tt_local_entry_put(tt_local);
1488                 }
1489                 spin_unlock_bh(list_lock);
1490         }
1491
1492         batadv_hash_destroy(hash);
1493
1494         bat_priv->tt.local_hash = NULL;
1495 }
1496
1497 static int batadv_tt_global_init(struct batadv_priv *bat_priv)
1498 {
1499         if (bat_priv->tt.global_hash)
1500                 return 0;
1501
1502         bat_priv->tt.global_hash = batadv_hash_new(1024);
1503
1504         if (!bat_priv->tt.global_hash)
1505                 return -ENOMEM;
1506
1507         batadv_hash_set_lock_class(bat_priv->tt.global_hash,
1508                                    &batadv_tt_global_hash_lock_class_key);
1509
1510         return 0;
1511 }
1512
1513 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
1514 {
1515         struct batadv_tt_change_node *entry, *safe;
1516
1517         spin_lock_bh(&bat_priv->tt.changes_list_lock);
1518
1519         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1520                                  list) {
1521                 list_del(&entry->list);
1522                 kmem_cache_free(batadv_tt_change_cache, entry);
1523         }
1524
1525         atomic_set(&bat_priv->tt.local_changes, 0);
1526         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1527 }
1528
1529 /**
1530  * batadv_tt_global_orig_entry_find() - find a TT orig_list_entry
1531  * @entry: the TT global entry where the orig_list_entry has to be
1532  *  extracted from
1533  * @orig_node: the originator for which the orig_list_entry has to be found
1534  *
1535  * retrieve the orig_tt_list_entry belonging to orig_node from the
1536  * batadv_tt_global_entry list
1537  *
1538  * Return: it with an increased refcounter, NULL if not found
1539  */
1540 static struct batadv_tt_orig_list_entry *
1541 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
1542                                  const struct batadv_orig_node *orig_node)
1543 {
1544         struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
1545         const struct hlist_head *head;
1546
1547         rcu_read_lock();
1548         head = &entry->orig_list;
1549         hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
1550                 if (tmp_orig_entry->orig_node != orig_node)
1551                         continue;
1552                 if (!kref_get_unless_zero(&tmp_orig_entry->refcount))
1553                         continue;
1554
1555                 orig_entry = tmp_orig_entry;
1556                 break;
1557         }
1558         rcu_read_unlock();
1559
1560         return orig_entry;
1561 }
1562
1563 /**
1564  * batadv_tt_global_entry_has_orig() - check if a TT global entry is also
1565  *  handled by a given originator
1566  * @entry: the TT global entry to check
1567  * @orig_node: the originator to search in the list
1568  * @flags: a pointer to store TT flags for the given @entry received
1569  *  from @orig_node
1570  *
1571  * find out if an orig_node is already in the list of a tt_global_entry.
1572  *
1573  * Return: true if found, false otherwise
1574  */
1575 static bool
1576 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
1577                                 const struct batadv_orig_node *orig_node,
1578                                 u8 *flags)
1579 {
1580         struct batadv_tt_orig_list_entry *orig_entry;
1581         bool found = false;
1582
1583         orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
1584         if (orig_entry) {
1585                 found = true;
1586
1587                 if (flags)
1588                         *flags = orig_entry->flags;
1589
1590                 batadv_tt_orig_list_entry_put(orig_entry);
1591         }
1592
1593         return found;
1594 }
1595
1596 /**
1597  * batadv_tt_global_sync_flags() - update TT sync flags
1598  * @tt_global: the TT global entry to update sync flags in
1599  *
1600  * Updates the sync flag bits in the tt_global flag attribute with a logical
1601  * OR of all sync flags from any of its TT orig entries.
1602  */
1603 static void
1604 batadv_tt_global_sync_flags(struct batadv_tt_global_entry *tt_global)
1605 {
1606         struct batadv_tt_orig_list_entry *orig_entry;
1607         const struct hlist_head *head;
1608         u16 flags = BATADV_NO_FLAGS;
1609
1610         rcu_read_lock();
1611         head = &tt_global->orig_list;
1612         hlist_for_each_entry_rcu(orig_entry, head, list)
1613                 flags |= orig_entry->flags;
1614         rcu_read_unlock();
1615
1616         flags |= tt_global->common.flags & (~BATADV_TT_SYNC_MASK);
1617         tt_global->common.flags = flags;
1618 }
1619
1620 /**
1621  * batadv_tt_global_orig_entry_add() - add or update a TT orig entry
1622  * @tt_global: the TT global entry to add an orig entry in
1623  * @orig_node: the originator to add an orig entry for
1624  * @ttvn: translation table version number of this changeset
1625  * @flags: TT sync flags
1626  */
1627 static void
1628 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
1629                                 struct batadv_orig_node *orig_node, int ttvn,
1630                                 u8 flags)
1631 {
1632         struct batadv_tt_orig_list_entry *orig_entry;
1633
1634         spin_lock_bh(&tt_global->list_lock);
1635
1636         orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
1637         if (orig_entry) {
1638                 /* refresh the ttvn: the current value could be a bogus one that
1639                  * was added during a "temporary client detection"
1640                  */
1641                 orig_entry->ttvn = ttvn;
1642                 orig_entry->flags = flags;
1643                 goto sync_flags;
1644         }
1645
1646         orig_entry = kmem_cache_zalloc(batadv_tt_orig_cache, GFP_ATOMIC);
1647         if (!orig_entry)
1648                 goto out;
1649
1650         INIT_HLIST_NODE(&orig_entry->list);
1651         kref_get(&orig_node->refcount);
1652         batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
1653         orig_entry->orig_node = orig_node;
1654         orig_entry->ttvn = ttvn;
1655         orig_entry->flags = flags;
1656         kref_init(&orig_entry->refcount);
1657
1658         kref_get(&orig_entry->refcount);
1659         hlist_add_head_rcu(&orig_entry->list,
1660                            &tt_global->orig_list);
1661         atomic_inc(&tt_global->orig_list_count);
1662
1663 sync_flags:
1664         batadv_tt_global_sync_flags(tt_global);
1665 out:
1666         if (orig_entry)
1667                 batadv_tt_orig_list_entry_put(orig_entry);
1668
1669         spin_unlock_bh(&tt_global->list_lock);
1670 }
1671
1672 /**
1673  * batadv_tt_global_add() - add a new TT global entry or update an existing one
1674  * @bat_priv: the bat priv with all the soft interface information
1675  * @orig_node: the originator announcing the client
1676  * @tt_addr: the mac address of the non-mesh client
1677  * @vid: VLAN identifier
1678  * @flags: TT flags that have to be set for this non-mesh client
1679  * @ttvn: the tt version number ever announcing this non-mesh client
1680  *
1681  * Add a new TT global entry for the given originator. If the entry already
1682  * exists add a new reference to the given originator (a global entry can have
1683  * references to multiple originators) and adjust the flags attribute to reflect
1684  * the function argument.
1685  * If a TT local entry exists for this non-mesh client remove it.
1686  *
1687  * The caller must hold orig_node refcount.
1688  *
1689  * Return: true if the new entry has been added, false otherwise
1690  */
1691 static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
1692                                  struct batadv_orig_node *orig_node,
1693                                  const unsigned char *tt_addr,
1694                                  unsigned short vid, u16 flags, u8 ttvn)
1695 {
1696         struct batadv_tt_global_entry *tt_global_entry;
1697         struct batadv_tt_local_entry *tt_local_entry;
1698         bool ret = false;
1699         int hash_added;
1700         struct batadv_tt_common_entry *common;
1701         u16 local_flags;
1702
1703         /* ignore global entries from backbone nodes */
1704         if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
1705                 return true;
1706
1707         tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
1708         tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
1709
1710         /* if the node already has a local client for this entry, it has to wait
1711          * for a roaming advertisement instead of manually messing up the global
1712          * table
1713          */
1714         if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
1715             !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
1716                 goto out;
1717
1718         if (!tt_global_entry) {
1719                 tt_global_entry = kmem_cache_zalloc(batadv_tg_cache,
1720                                                     GFP_ATOMIC);
1721                 if (!tt_global_entry)
1722                         goto out;
1723
1724                 common = &tt_global_entry->common;
1725                 ether_addr_copy(common->addr, tt_addr);
1726                 common->vid = vid;
1727
1728                 if (!is_multicast_ether_addr(common->addr))
1729                         common->flags = flags & (~BATADV_TT_SYNC_MASK);
1730
1731                 tt_global_entry->roam_at = 0;
1732                 /* node must store current time in case of roaming. This is
1733                  * needed to purge this entry out on timeout (if nobody claims
1734                  * it)
1735                  */
1736                 if (flags & BATADV_TT_CLIENT_ROAM)
1737                         tt_global_entry->roam_at = jiffies;
1738                 kref_init(&common->refcount);
1739                 common->added_at = jiffies;
1740
1741                 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
1742                 atomic_set(&tt_global_entry->orig_list_count, 0);
1743                 spin_lock_init(&tt_global_entry->list_lock);
1744
1745                 kref_get(&common->refcount);
1746                 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
1747                                              batadv_compare_tt,
1748                                              batadv_choose_tt, common,
1749                                              &common->hash_entry);
1750
1751                 if (unlikely(hash_added != 0)) {
1752                         /* remove the reference for the hash */
1753                         batadv_tt_global_entry_put(tt_global_entry);
1754                         goto out_remove;
1755                 }
1756         } else {
1757                 common = &tt_global_entry->common;
1758                 /* If there is already a global entry, we can use this one for
1759                  * our processing.
1760                  * But if we are trying to add a temporary client then here are
1761                  * two options at this point:
1762                  * 1) the global client is not a temporary client: the global
1763                  *    client has to be left as it is, temporary information
1764                  *    should never override any already known client state
1765                  * 2) the global client is a temporary client: purge the
1766                  *    originator list and add the new one orig_entry
1767                  */
1768                 if (flags & BATADV_TT_CLIENT_TEMP) {
1769                         if (!(common->flags & BATADV_TT_CLIENT_TEMP))
1770                                 goto out;
1771                         if (batadv_tt_global_entry_has_orig(tt_global_entry,
1772                                                             orig_node, NULL))
1773                                 goto out_remove;
1774                         batadv_tt_global_del_orig_list(tt_global_entry);
1775                         goto add_orig_entry;
1776                 }
1777
1778                 /* if the client was temporary added before receiving the first
1779                  * OGM announcing it, we have to clear the TEMP flag. Also,
1780                  * remove the previous temporary orig node and re-add it
1781                  * if required. If the orig entry changed, the new one which
1782                  * is a non-temporary entry is preferred.
1783                  */
1784                 if (common->flags & BATADV_TT_CLIENT_TEMP) {
1785                         batadv_tt_global_del_orig_list(tt_global_entry);
1786                         common->flags &= ~BATADV_TT_CLIENT_TEMP;
1787                 }
1788
1789                 /* the change can carry possible "attribute" flags like the
1790                  * TT_CLIENT_TEMP, therefore they have to be copied in the
1791                  * client entry
1792                  */
1793                 if (!is_multicast_ether_addr(common->addr))
1794                         common->flags |= flags & (~BATADV_TT_SYNC_MASK);
1795
1796                 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1797                  * one originator left in the list and we previously received a
1798                  * delete + roaming change for this originator.
1799                  *
1800                  * We should first delete the old originator before adding the
1801                  * new one.
1802                  */
1803                 if (common->flags & BATADV_TT_CLIENT_ROAM) {
1804                         batadv_tt_global_del_orig_list(tt_global_entry);
1805                         common->flags &= ~BATADV_TT_CLIENT_ROAM;
1806                         tt_global_entry->roam_at = 0;
1807                 }
1808         }
1809 add_orig_entry:
1810         /* add the new orig_entry (if needed) or update it */
1811         batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn,
1812                                         flags & BATADV_TT_SYNC_MASK);
1813
1814         batadv_dbg(BATADV_DBG_TT, bat_priv,
1815                    "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1816                    common->addr, batadv_print_vid(common->vid),
1817                    orig_node->orig);
1818         ret = true;
1819
1820 out_remove:
1821         /* Do not remove multicast addresses from the local hash on
1822          * global additions
1823          */
1824         if (is_multicast_ether_addr(tt_addr))
1825                 goto out;
1826
1827         /* remove address from local hash if present */
1828         local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
1829                                              "global tt received",
1830                                              flags & BATADV_TT_CLIENT_ROAM);
1831         tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
1832
1833         if (!(flags & BATADV_TT_CLIENT_ROAM))
1834                 /* this is a normal global add. Therefore the client is not in a
1835                  * roaming state anymore.
1836                  */
1837                 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
1838
1839 out:
1840         if (tt_global_entry)
1841                 batadv_tt_global_entry_put(tt_global_entry);
1842         if (tt_local_entry)
1843                 batadv_tt_local_entry_put(tt_local_entry);
1844         return ret;
1845 }
1846
1847 /**
1848  * batadv_transtable_best_orig() - Get best originator list entry from tt entry
1849  * @bat_priv: the bat priv with all the soft interface information
1850  * @tt_global_entry: global translation table entry to be analyzed
1851  *
1852  * This functon assumes the caller holds rcu_read_lock().
1853  * Return: best originator list entry or NULL on errors.
1854  */
1855 static struct batadv_tt_orig_list_entry *
1856 batadv_transtable_best_orig(struct batadv_priv *bat_priv,
1857                             struct batadv_tt_global_entry *tt_global_entry)
1858 {
1859         struct batadv_neigh_node *router, *best_router = NULL;
1860         struct batadv_algo_ops *bao = bat_priv->algo_ops;
1861         struct hlist_head *head;
1862         struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
1863
1864         head = &tt_global_entry->orig_list;
1865         hlist_for_each_entry_rcu(orig_entry, head, list) {
1866                 router = batadv_orig_router_get(orig_entry->orig_node,
1867                                                 BATADV_IF_DEFAULT);
1868                 if (!router)
1869                         continue;
1870
1871                 if (best_router &&
1872                     bao->neigh.cmp(router, BATADV_IF_DEFAULT, best_router,
1873                                    BATADV_IF_DEFAULT) <= 0) {
1874                         batadv_neigh_node_put(router);
1875                         continue;
1876                 }
1877
1878                 /* release the refcount for the "old" best */
1879                 if (best_router)
1880                         batadv_neigh_node_put(best_router);
1881
1882                 best_entry = orig_entry;
1883                 best_router = router;
1884         }
1885
1886         if (best_router)
1887                 batadv_neigh_node_put(best_router);
1888
1889         return best_entry;
1890 }
1891
1892 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
1893 /**
1894  * batadv_tt_global_print_entry() - print all orig nodes who announce the
1895  *  address for this global entry
1896  * @bat_priv: the bat priv with all the soft interface information
1897  * @tt_global_entry: global translation table entry to be printed
1898  * @seq: debugfs table seq_file struct
1899  *
1900  * This functon assumes the caller holds rcu_read_lock().
1901  */
1902 static void
1903 batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
1904                              struct batadv_tt_global_entry *tt_global_entry,
1905                              struct seq_file *seq)
1906 {
1907         struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
1908         struct batadv_tt_common_entry *tt_common_entry;
1909         struct batadv_orig_node_vlan *vlan;
1910         struct hlist_head *head;
1911         u8 last_ttvn;
1912         u16 flags;
1913
1914         tt_common_entry = &tt_global_entry->common;
1915         flags = tt_common_entry->flags;
1916
1917         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1918         if (best_entry) {
1919                 vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
1920                                                  tt_common_entry->vid);
1921                 if (!vlan) {
1922                         seq_printf(seq,
1923                                    " * Cannot retrieve VLAN %d for originator %pM\n",
1924                                    batadv_print_vid(tt_common_entry->vid),
1925                                    best_entry->orig_node->orig);
1926                         goto print_list;
1927                 }
1928
1929                 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
1930                 seq_printf(seq,
1931                            " %c %pM %4i   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1932                            '*', tt_global_entry->common.addr,
1933                            batadv_print_vid(tt_global_entry->common.vid),
1934                            best_entry->ttvn, best_entry->orig_node->orig,
1935                            last_ttvn, vlan->tt.crc,
1936                            ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1937                            ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1938                            ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1939                            ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1940
1941                 batadv_orig_node_vlan_put(vlan);
1942         }
1943
1944 print_list:
1945         head = &tt_global_entry->orig_list;
1946
1947         hlist_for_each_entry_rcu(orig_entry, head, list) {
1948                 if (best_entry == orig_entry)
1949                         continue;
1950
1951                 vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
1952                                                  tt_common_entry->vid);
1953                 if (!vlan) {
1954                         seq_printf(seq,
1955                                    " + Cannot retrieve VLAN %d for originator %pM\n",
1956                                    batadv_print_vid(tt_common_entry->vid),
1957                                    orig_entry->orig_node->orig);
1958                         continue;
1959                 }
1960
1961                 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
1962                 seq_printf(seq,
1963                            " %c %pM %4d   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1964                            '+', tt_global_entry->common.addr,
1965                            batadv_print_vid(tt_global_entry->common.vid),
1966                            orig_entry->ttvn, orig_entry->orig_node->orig,
1967                            last_ttvn, vlan->tt.crc,
1968                            ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1969                            ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1970                            ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1971                            ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1972
1973                 batadv_orig_node_vlan_put(vlan);
1974         }
1975 }
1976
1977 /**
1978  * batadv_tt_global_seq_print_text() - Print the global tt table in a seq file
1979  * @seq: seq file to print on
1980  * @offset: not used
1981  *
1982  * Return: always 0
1983  */
1984 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
1985 {
1986         struct net_device *net_dev = (struct net_device *)seq->private;
1987         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1988         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1989         struct batadv_tt_common_entry *tt_common_entry;
1990         struct batadv_tt_global_entry *tt_global;
1991         struct batadv_hard_iface *primary_if;
1992         struct hlist_head *head;
1993         u32 i;
1994
1995         primary_if = batadv_seq_print_text_primary_if_get(seq);
1996         if (!primary_if)
1997                 goto out;
1998
1999         seq_printf(seq,
2000                    "Globally announced TT entries received via the mesh %s\n",
2001                    net_dev->name);
2002         seq_puts(seq,
2003                  "       Client         VID  (TTVN)       Originator      (Curr TTVN) (CRC       ) Flags\n");
2004
2005         for (i = 0; i < hash->size; i++) {
2006                 head = &hash->table[i];
2007
2008                 rcu_read_lock();
2009                 hlist_for_each_entry_rcu(tt_common_entry,
2010                                          head, hash_entry) {
2011                         tt_global = container_of(tt_common_entry,
2012                                                  struct batadv_tt_global_entry,
2013                                                  common);
2014                         batadv_tt_global_print_entry(bat_priv, tt_global, seq);
2015                 }
2016                 rcu_read_unlock();
2017         }
2018 out:
2019         if (primary_if)
2020                 batadv_hardif_put(primary_if);
2021         return 0;
2022 }
2023 #endif
2024
2025 /**
2026  * batadv_tt_global_dump_subentry() - Dump all TT local entries into a message
2027  * @msg: Netlink message to dump into
2028  * @portid: Port making netlink request
2029  * @seq: Sequence number of netlink message
2030  * @common: tt local & tt global common data
2031  * @orig: Originator node announcing a non-mesh client
2032  * @best: Is the best originator for the TT entry
2033  *
2034  * Return: Error code, or 0 on success
2035  */
2036 static int
2037 batadv_tt_global_dump_subentry(struct sk_buff *msg, u32 portid, u32 seq,
2038                                struct batadv_tt_common_entry *common,
2039                                struct batadv_tt_orig_list_entry *orig,
2040                                bool best)
2041 {
2042         u16 flags = (common->flags & (~BATADV_TT_SYNC_MASK)) | orig->flags;
2043         void *hdr;
2044         struct batadv_orig_node_vlan *vlan;
2045         u8 last_ttvn;
2046         u32 crc;
2047
2048         vlan = batadv_orig_node_vlan_get(orig->orig_node,
2049                                          common->vid);
2050         if (!vlan)
2051                 return 0;
2052
2053         crc = vlan->tt.crc;
2054
2055         batadv_orig_node_vlan_put(vlan);
2056
2057         hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
2058                           NLM_F_MULTI,
2059                           BATADV_CMD_GET_TRANSTABLE_GLOBAL);
2060         if (!hdr)
2061                 return -ENOBUFS;
2062
2063         last_ttvn = atomic_read(&orig->orig_node->last_ttvn);
2064
2065         if (nla_put(msg, BATADV_ATTR_TT_ADDRESS, ETH_ALEN, common->addr) ||
2066             nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,
2067                     orig->orig_node->orig) ||
2068             nla_put_u8(msg, BATADV_ATTR_TT_TTVN, orig->ttvn) ||
2069             nla_put_u8(msg, BATADV_ATTR_TT_LAST_TTVN, last_ttvn) ||
2070             nla_put_u32(msg, BATADV_ATTR_TT_CRC32, crc) ||
2071             nla_put_u16(msg, BATADV_ATTR_TT_VID, common->vid) ||
2072             nla_put_u32(msg, BATADV_ATTR_TT_FLAGS, flags))
2073                 goto nla_put_failure;
2074
2075         if (best && nla_put_flag(msg, BATADV_ATTR_FLAG_BEST))
2076                 goto nla_put_failure;
2077
2078         genlmsg_end(msg, hdr);
2079         return 0;
2080
2081  nla_put_failure:
2082         genlmsg_cancel(msg, hdr);
2083         return -EMSGSIZE;
2084 }
2085
2086 /**
2087  * batadv_tt_global_dump_entry() - Dump one TT global entry into a message
2088  * @msg: Netlink message to dump into
2089  * @portid: Port making netlink request
2090  * @seq: Sequence number of netlink message
2091  * @bat_priv: The bat priv with all the soft interface information
2092  * @common: tt local & tt global common data
2093  * @sub_s: Number of entries to skip
2094  *
2095  * This function assumes the caller holds rcu_read_lock().
2096  *
2097  * Return: Error code, or 0 on success
2098  */
2099 static int
2100 batadv_tt_global_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
2101                             struct batadv_priv *bat_priv,
2102                             struct batadv_tt_common_entry *common, int *sub_s)
2103 {
2104         struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
2105         struct batadv_tt_global_entry *global;
2106         struct hlist_head *head;
2107         int sub = 0;
2108         bool best;
2109
2110         global = container_of(common, struct batadv_tt_global_entry, common);
2111         best_entry = batadv_transtable_best_orig(bat_priv, global);
2112         head = &global->orig_list;
2113
2114         hlist_for_each_entry_rcu(orig_entry, head, list) {
2115                 if (sub++ < *sub_s)
2116                         continue;
2117
2118                 best = (orig_entry == best_entry);
2119
2120                 if (batadv_tt_global_dump_subentry(msg, portid, seq, common,
2121                                                    orig_entry, best)) {
2122                         *sub_s = sub - 1;
2123                         return -EMSGSIZE;
2124                 }
2125         }
2126
2127         *sub_s = 0;
2128         return 0;
2129 }
2130
2131 /**
2132  * batadv_tt_global_dump_bucket() - Dump one TT local bucket into a message
2133  * @msg: Netlink message to dump into
2134  * @portid: Port making netlink request
2135  * @seq: Sequence number of netlink message
2136  * @bat_priv: The bat priv with all the soft interface information
2137  * @head: Pointer to the list containing the global tt entries
2138  * @idx_s: Number of entries to skip
2139  * @sub: Number of entries to skip
2140  *
2141  * Return: Error code, or 0 on success
2142  */
2143 static int
2144 batadv_tt_global_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
2145                              struct batadv_priv *bat_priv,
2146                              struct hlist_head *head, int *idx_s, int *sub)
2147 {
2148         struct batadv_tt_common_entry *common;
2149         int idx = 0;
2150
2151         rcu_read_lock();
2152         hlist_for_each_entry_rcu(common, head, hash_entry) {
2153                 if (idx++ < *idx_s)
2154                         continue;
2155
2156                 if (batadv_tt_global_dump_entry(msg, portid, seq, bat_priv,
2157                                                 common, sub)) {
2158                         rcu_read_unlock();
2159                         *idx_s = idx - 1;
2160                         return -EMSGSIZE;
2161                 }
2162         }
2163         rcu_read_unlock();
2164
2165         *idx_s = 0;
2166         *sub = 0;
2167         return 0;
2168 }
2169
2170 /**
2171  * batadv_tt_global_dump() -  Dump TT global entries into a message
2172  * @msg: Netlink message to dump into
2173  * @cb: Parameters from query
2174  *
2175  * Return: Error code, or length of message on success
2176  */
2177 int batadv_tt_global_dump(struct sk_buff *msg, struct netlink_callback *cb)
2178 {
2179         struct net *net = sock_net(cb->skb->sk);
2180         struct net_device *soft_iface;
2181         struct batadv_priv *bat_priv;
2182         struct batadv_hard_iface *primary_if = NULL;
2183         struct batadv_hashtable *hash;
2184         struct hlist_head *head;
2185         int ret;
2186         int ifindex;
2187         int bucket = cb->args[0];
2188         int idx = cb->args[1];
2189         int sub = cb->args[2];
2190         int portid = NETLINK_CB(cb->skb).portid;
2191
2192         ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
2193         if (!ifindex)
2194                 return -EINVAL;
2195
2196         soft_iface = dev_get_by_index(net, ifindex);
2197         if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
2198                 ret = -ENODEV;
2199                 goto out;
2200         }
2201
2202         bat_priv = netdev_priv(soft_iface);
2203
2204         primary_if = batadv_primary_if_get_selected(bat_priv);
2205         if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
2206                 ret = -ENOENT;
2207                 goto out;
2208         }
2209
2210         hash = bat_priv->tt.global_hash;
2211
2212         while (bucket < hash->size) {
2213                 head = &hash->table[bucket];
2214
2215                 if (batadv_tt_global_dump_bucket(msg, portid,
2216                                                  cb->nlh->nlmsg_seq, bat_priv,
2217                                                  head, &idx, &sub))
2218                         break;
2219
2220                 bucket++;
2221         }
2222
2223         ret = msg->len;
2224
2225  out:
2226         if (primary_if)
2227                 batadv_hardif_put(primary_if);
2228         if (soft_iface)
2229                 dev_put(soft_iface);
2230
2231         cb->args[0] = bucket;
2232         cb->args[1] = idx;
2233         cb->args[2] = sub;
2234
2235         return ret;
2236 }
2237
2238 /**
2239  * _batadv_tt_global_del_orig_entry() - remove and free an orig_entry
2240  * @tt_global_entry: the global entry to remove the orig_entry from
2241  * @orig_entry: the orig entry to remove and free
2242  *
2243  * Remove an orig_entry from its list in the given tt_global_entry and
2244  * free this orig_entry afterwards.
2245  *
2246  * Caller must hold tt_global_entry->list_lock and ensure orig_entry->list is
2247  * part of a list.
2248  */
2249 static void
2250 _batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
2251                                  struct batadv_tt_orig_list_entry *orig_entry)
2252 {
2253         lockdep_assert_held(&tt_global_entry->list_lock);
2254
2255         batadv_tt_global_size_dec(orig_entry->orig_node,
2256                                   tt_global_entry->common.vid);
2257         atomic_dec(&tt_global_entry->orig_list_count);
2258         /* requires holding tt_global_entry->list_lock and orig_entry->list
2259          * being part of a list
2260          */
2261         hlist_del_rcu(&orig_entry->list);
2262         batadv_tt_orig_list_entry_put(orig_entry);
2263 }
2264
2265 /* deletes the orig list of a tt_global_entry */
2266 static void
2267 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
2268 {
2269         struct hlist_head *head;
2270         struct hlist_node *safe;
2271         struct batadv_tt_orig_list_entry *orig_entry;
2272
2273         spin_lock_bh(&tt_global_entry->list_lock);
2274         head = &tt_global_entry->orig_list;
2275         hlist_for_each_entry_safe(orig_entry, safe, head, list)
2276                 _batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
2277         spin_unlock_bh(&tt_global_entry->list_lock);
2278 }
2279
2280 /**
2281  * batadv_tt_global_del_orig_node() - remove orig_node from a global tt entry
2282  * @bat_priv: the bat priv with all the soft interface information
2283  * @tt_global_entry: the global entry to remove the orig_node from
2284  * @orig_node: the originator announcing the client
2285  * @message: message to append to the log on deletion
2286  *
2287  * Remove the given orig_node and its according orig_entry from the given
2288  * global tt entry.
2289  */
2290 static void
2291 batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
2292                                struct batadv_tt_global_entry *tt_global_entry,
2293                                struct batadv_orig_node *orig_node,
2294                                const char *message)
2295 {
2296         struct hlist_head *head;
2297         struct hlist_node *safe;
2298         struct batadv_tt_orig_list_entry *orig_entry;
2299         unsigned short vid;
2300
2301         spin_lock_bh(&tt_global_entry->list_lock);
2302         head = &tt_global_entry->orig_list;
2303         hlist_for_each_entry_safe(orig_entry, safe, head, list) {
2304                 if (orig_entry->orig_node == orig_node) {
2305                         vid = tt_global_entry->common.vid;
2306                         batadv_dbg(BATADV_DBG_TT, bat_priv,
2307                                    "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
2308                                    orig_node->orig,
2309                                    tt_global_entry->common.addr,
2310                                    batadv_print_vid(vid), message);
2311                         _batadv_tt_global_del_orig_entry(tt_global_entry,
2312                                                          orig_entry);
2313                 }
2314         }
2315         spin_unlock_bh(&tt_global_entry->list_lock);
2316 }
2317
2318 /* If the client is to be deleted, we check if it is the last origantor entry
2319  * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
2320  * timer, otherwise we simply remove the originator scheduled for deletion.
2321  */
2322 static void
2323 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
2324                              struct batadv_tt_global_entry *tt_global_entry,
2325                              struct batadv_orig_node *orig_node,
2326                              const char *message)
2327 {
2328         bool last_entry = true;
2329         struct hlist_head *head;
2330         struct batadv_tt_orig_list_entry *orig_entry;
2331
2332         /* no local entry exists, case 1:
2333          * Check if this is the last one or if other entries exist.
2334          */
2335
2336         rcu_read_lock();
2337         head = &tt_global_entry->orig_list;
2338         hlist_for_each_entry_rcu(orig_entry, head, list) {
2339                 if (orig_entry->orig_node != orig_node) {
2340                         last_entry = false;
2341                         break;
2342                 }
2343         }
2344         rcu_read_unlock();
2345
2346         if (last_entry) {
2347                 /* its the last one, mark for roaming. */
2348                 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
2349                 tt_global_entry->roam_at = jiffies;
2350         } else {
2351                 /* there is another entry, we can simply delete this
2352                  * one and can still use the other one.
2353                  */
2354                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
2355                                                orig_node, message);
2356         }
2357 }
2358
2359 /**
2360  * batadv_tt_global_del() - remove a client from the global table
2361  * @bat_priv: the bat priv with all the soft interface information
2362  * @orig_node: an originator serving this client
2363  * @addr: the mac address of the client
2364  * @vid: VLAN identifier
2365  * @message: a message explaining the reason for deleting the client to print
2366  *  for debugging purpose
2367  * @roaming: true if the deletion has been triggered by a roaming event
2368  */
2369 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
2370                                  struct batadv_orig_node *orig_node,
2371                                  const unsigned char *addr, unsigned short vid,
2372                                  const char *message, bool roaming)
2373 {
2374         struct batadv_tt_global_entry *tt_global_entry;
2375         struct batadv_tt_local_entry *local_entry = NULL;
2376
2377         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
2378         if (!tt_global_entry)
2379                 goto out;
2380
2381         if (!roaming) {
2382                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
2383                                                orig_node, message);
2384
2385                 if (hlist_empty(&tt_global_entry->orig_list))
2386                         batadv_tt_global_free(bat_priv, tt_global_entry,
2387                                               message);
2388
2389                 goto out;
2390         }
2391
2392         /* if we are deleting a global entry due to a roam
2393          * event, there are two possibilities:
2394          * 1) the client roamed from node A to node B => if there
2395          *    is only one originator left for this client, we mark
2396          *    it with BATADV_TT_CLIENT_ROAM, we start a timer and we
2397          *    wait for node B to claim it. In case of timeout
2398          *    the entry is purged.
2399          *
2400          *    If there are other originators left, we directly delete
2401          *    the originator.
2402          * 2) the client roamed to us => we can directly delete
2403          *    the global entry, since it is useless now.
2404          */
2405         local_entry = batadv_tt_local_hash_find(bat_priv,
2406                                                 tt_global_entry->common.addr,
2407                                                 vid);
2408         if (local_entry) {
2409                 /* local entry exists, case 2: client roamed to us. */
2410                 batadv_tt_global_del_orig_list(tt_global_entry);
2411                 batadv_tt_global_free(bat_priv, tt_global_entry, message);
2412         } else {
2413                 /* no local entry exists, case 1: check for roaming */
2414                 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
2415                                              orig_node, message);
2416         }
2417
2418 out:
2419         if (tt_global_entry)
2420                 batadv_tt_global_entry_put(tt_global_entry);
2421         if (local_entry)
2422                 batadv_tt_local_entry_put(local_entry);
2423 }
2424
2425 /**
2426  * batadv_tt_global_del_orig() - remove all the TT global entries belonging to
2427  *  the given originator matching the provided vid
2428  * @bat_priv: the bat priv with all the soft interface information
2429  * @orig_node: the originator owning the entries to remove
2430  * @match_vid: the VLAN identifier to match. If negative all the entries will be
2431  *  removed
2432  * @message: debug message to print as "reason"
2433  */
2434 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
2435                                struct batadv_orig_node *orig_node,
2436                                s32 match_vid,
2437                                const char *message)
2438 {
2439         struct batadv_tt_global_entry *tt_global;
2440         struct batadv_tt_common_entry *tt_common_entry;
2441         u32 i;
2442         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2443         struct hlist_node *safe;
2444         struct hlist_head *head;
2445         spinlock_t *list_lock; /* protects write access to the hash lists */
2446         unsigned short vid;
2447
2448         if (!hash)
2449                 return;
2450
2451         for (i = 0; i < hash->size; i++) {
2452                 head = &hash->table[i];
2453                 list_lock = &hash->list_locks[i];
2454
2455                 spin_lock_bh(list_lock);
2456                 hlist_for_each_entry_safe(tt_common_entry, safe,
2457                                           head, hash_entry) {
2458                         /* remove only matching entries */
2459                         if (match_vid >= 0 && tt_common_entry->vid != match_vid)
2460                                 continue;
2461
2462                         tt_global = container_of(tt_common_entry,
2463                                                  struct batadv_tt_global_entry,
2464                                                  common);
2465
2466                         batadv_tt_global_del_orig_node(bat_priv, tt_global,
2467                                                        orig_node, message);
2468
2469                         if (hlist_empty(&tt_global->orig_list)) {
2470                                 vid = tt_global->common.vid;
2471                                 batadv_dbg(BATADV_DBG_TT, bat_priv,
2472                                            "Deleting global tt entry %pM (vid: %d): %s\n",
2473                                            tt_global->common.addr,
2474                                            batadv_print_vid(vid), message);
2475                                 hlist_del_rcu(&tt_common_entry->hash_entry);
2476                                 batadv_tt_global_entry_put(tt_global);
2477                         }
2478                 }
2479                 spin_unlock_bh(list_lock);
2480         }
2481         clear_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
2482 }
2483
2484 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
2485                                       char **msg)
2486 {
2487         bool purge = false;
2488         unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
2489         unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
2490
2491         if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
2492             batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
2493                 purge = true;
2494                 *msg = "Roaming timeout\n";
2495         }
2496
2497         if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
2498             batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
2499                 purge = true;
2500                 *msg = "Temporary client timeout\n";
2501         }
2502
2503         return purge;
2504 }
2505
2506 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
2507 {
2508         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2509         struct hlist_head *head;
2510         struct hlist_node *node_tmp;
2511         spinlock_t *list_lock; /* protects write access to the hash lists */
2512         u32 i;
2513         char *msg = NULL;
2514         struct batadv_tt_common_entry *tt_common;
2515         struct batadv_tt_global_entry *tt_global;
2516
2517         for (i = 0; i < hash->size; i++) {
2518                 head = &hash->table[i];
2519                 list_lock = &hash->list_locks[i];
2520
2521                 spin_lock_bh(list_lock);
2522                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
2523                                           hash_entry) {
2524                         tt_global = container_of(tt_common,
2525                                                  struct batadv_tt_global_entry,
2526                                                  common);
2527
2528                         if (!batadv_tt_global_to_purge(tt_global, &msg))
2529                                 continue;
2530
2531                         batadv_dbg(BATADV_DBG_TT, bat_priv,
2532                                    "Deleting global tt entry %pM (vid: %d): %s\n",
2533                                    tt_global->common.addr,
2534                                    batadv_print_vid(tt_global->common.vid),
2535                                    msg);
2536
2537                         hlist_del_rcu(&tt_common->hash_entry);
2538
2539                         batadv_tt_global_entry_put(tt_global);
2540                 }
2541                 spin_unlock_bh(list_lock);
2542         }
2543 }
2544
2545 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
2546 {
2547         struct batadv_hashtable *hash;
2548         spinlock_t *list_lock; /* protects write access to the hash lists */
2549         struct batadv_tt_common_entry *tt_common_entry;
2550         struct batadv_tt_global_entry *tt_global;
2551         struct hlist_node *node_tmp;
2552         struct hlist_head *head;
2553         u32 i;
2554
2555         if (!bat_priv->tt.global_hash)
2556                 return;
2557
2558         hash = bat_priv->tt.global_hash;
2559
2560         for (i = 0; i < hash->size; i++) {
2561                 head = &hash->table[i];
2562                 list_lock = &hash->list_locks[i];
2563
2564                 spin_lock_bh(list_lock);
2565                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
2566                                           head, hash_entry) {
2567                         hlist_del_rcu(&tt_common_entry->hash_entry);
2568                         tt_global = container_of(tt_common_entry,
2569                                                  struct batadv_tt_global_entry,
2570                                                  common);
2571                         batadv_tt_global_entry_put(tt_global);
2572                 }
2573                 spin_unlock_bh(list_lock);
2574         }
2575
2576         batadv_hash_destroy(hash);
2577
2578         bat_priv->tt.global_hash = NULL;
2579 }
2580
2581 static bool
2582 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
2583                        struct batadv_tt_global_entry *tt_global_entry)
2584 {
2585         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
2586             tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
2587                 return true;
2588
2589         /* check if the two clients are marked as isolated */
2590         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
2591             tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
2592                 return true;
2593
2594         return false;
2595 }
2596
2597 /**
2598  * batadv_transtable_search() - get the mesh destination for a given client
2599  * @bat_priv: the bat priv with all the soft interface information
2600  * @src: mac address of the source client
2601  * @addr: mac address of the destination client
2602  * @vid: VLAN identifier
2603  *
2604  * Return: a pointer to the originator that was selected as destination in the
2605  * mesh for contacting the client 'addr', NULL otherwise.
2606  * In case of multiple originators serving the same client, the function returns
2607  * the best one (best in terms of metric towards the destination node).
2608  *
2609  * If the two clients are AP isolated the function returns NULL.
2610  */
2611 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
2612                                                   const u8 *src,
2613                                                   const u8 *addr,
2614                                                   unsigned short vid)
2615 {
2616         struct batadv_tt_local_entry *tt_local_entry = NULL;
2617         struct batadv_tt_global_entry *tt_global_entry = NULL;
2618         struct batadv_orig_node *orig_node = NULL;
2619         struct batadv_tt_orig_list_entry *best_entry;
2620
2621         if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) {
2622                 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
2623                 if (!tt_local_entry ||
2624                     (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
2625                         goto out;
2626         }
2627
2628         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
2629         if (!tt_global_entry)
2630                 goto out;
2631
2632         /* check whether the clients should not communicate due to AP
2633          * isolation
2634          */
2635         if (tt_local_entry &&
2636             _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
2637                 goto out;
2638
2639         rcu_read_lock();
2640         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
2641         /* found anything? */
2642         if (best_entry)
2643                 orig_node = best_entry->orig_node;
2644         if (orig_node && !kref_get_unless_zero(&orig_node->refcount))
2645                 orig_node = NULL;
2646         rcu_read_unlock();
2647
2648 out:
2649         if (tt_global_entry)
2650                 batadv_tt_global_entry_put(tt_global_entry);
2651         if (tt_local_entry)
2652                 batadv_tt_local_entry_put(tt_local_entry);
2653
2654         return orig_node;
2655 }
2656
2657 /**
2658  * batadv_tt_global_crc() - calculates the checksum of the local table belonging
2659  *  to the given orig_node
2660  * @bat_priv: the bat priv with all the soft interface information
2661  * @orig_node: originator for which the CRC should be computed
2662  * @vid: VLAN identifier for which the CRC32 has to be computed
2663  *
2664  * This function computes the checksum for the global table corresponding to a
2665  * specific originator. In particular, the checksum is computed as follows: For
2666  * each client connected to the originator the CRC32C of the MAC address and the
2667  * VID is computed and then all the CRC32Cs of the various clients are xor'ed
2668  * together.
2669  *
2670  * The idea behind is that CRC32C should be used as much as possible in order to
2671  * produce a unique hash of the table, but since the order which is used to feed
2672  * the CRC32C function affects the result and since every node in the network
2673  * probably sorts the clients differently, the hash function cannot be directly
2674  * computed over the entire table. Hence the CRC32C is used only on
2675  * the single client entry, while all the results are then xor'ed together
2676  * because the XOR operation can combine them all while trying to reduce the
2677  * noise as much as possible.
2678  *
2679  * Return: the checksum of the global table of a given originator.
2680  */
2681 static u32 batadv_tt_global_crc(struct batadv_priv *bat_priv,
2682                                 struct batadv_orig_node *orig_node,
2683                                 unsigned short vid)
2684 {
2685         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2686         struct batadv_tt_orig_list_entry *tt_orig;
2687         struct batadv_tt_common_entry *tt_common;
2688         struct batadv_tt_global_entry *tt_global;
2689         struct hlist_head *head;
2690         u32 i, crc_tmp, crc = 0;
2691         u8 flags;
2692         __be16 tmp_vid;
2693
2694         for (i = 0; i < hash->size; i++) {
2695                 head = &hash->table[i];
2696
2697                 rcu_read_lock();
2698                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2699                         tt_global = container_of(tt_common,
2700                                                  struct batadv_tt_global_entry,
2701                                                  common);
2702                         /* compute the CRC only for entries belonging to the
2703                          * VLAN identified by the vid passed as parameter
2704                          */
2705                         if (tt_common->vid != vid)
2706                                 continue;
2707
2708                         /* Roaming clients are in the global table for
2709                          * consistency only. They don't have to be
2710                          * taken into account while computing the
2711                          * global crc
2712                          */
2713                         if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
2714                                 continue;
2715                         /* Temporary clients have not been announced yet, so
2716                          * they have to be skipped while computing the global
2717                          * crc
2718                          */
2719                         if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
2720                                 continue;
2721
2722                         /* find out if this global entry is announced by this
2723                          * originator
2724                          */
2725                         tt_orig = batadv_tt_global_orig_entry_find(tt_global,
2726                                                                    orig_node);
2727                         if (!tt_orig)
2728                                 continue;
2729
2730                         /* use network order to read the VID: this ensures that
2731                          * every node reads the bytes in the same order.
2732                          */
2733                         tmp_vid = htons(tt_common->vid);
2734                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2735
2736                         /* compute the CRC on flags that have to be kept in sync
2737                          * among nodes
2738                          */
2739                         flags = tt_orig->flags;
2740                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2741
2742                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2743
2744                         batadv_tt_orig_list_entry_put(tt_orig);
2745                 }
2746                 rcu_read_unlock();
2747         }
2748
2749         return crc;
2750 }
2751
2752 /**
2753  * batadv_tt_local_crc() - calculates the checksum of the local table
2754  * @bat_priv: the bat priv with all the soft interface information
2755  * @vid: VLAN identifier for which the CRC32 has to be computed
2756  *
2757  * For details about the computation, please refer to the documentation for
2758  * batadv_tt_global_crc().
2759  *
2760  * Return: the checksum of the local table
2761  */
2762 static u32 batadv_tt_local_crc(struct batadv_priv *bat_priv,
2763                                unsigned short vid)
2764 {
2765         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2766         struct batadv_tt_common_entry *tt_common;
2767         struct hlist_head *head;
2768         u32 i, crc_tmp, crc = 0;
2769         u8 flags;
2770         __be16 tmp_vid;
2771
2772         for (i = 0; i < hash->size; i++) {
2773                 head = &hash->table[i];
2774
2775                 rcu_read_lock();
2776                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2777                         /* compute the CRC only for entries belonging to the
2778                          * VLAN identified by vid
2779                          */
2780                         if (tt_common->vid != vid)
2781                                 continue;
2782
2783                         /* not yet committed clients have not to be taken into
2784                          * account while computing the CRC
2785                          */
2786                         if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2787                                 continue;
2788
2789                         /* use network order to read the VID: this ensures that
2790                          * every node reads the bytes in the same order.
2791                          */
2792                         tmp_vid = htons(tt_common->vid);
2793                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2794
2795                         /* compute the CRC on flags that have to be kept in sync
2796                          * among nodes
2797                          */
2798                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2799                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2800
2801                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2802                 }
2803                 rcu_read_unlock();
2804         }
2805
2806         return crc;
2807 }
2808
2809 /**
2810  * batadv_tt_req_node_release() - free tt_req node entry
2811  * @ref: kref pointer of the tt req_node entry
2812  */
2813 static void batadv_tt_req_node_release(struct kref *ref)
2814 {
2815         struct batadv_tt_req_node *tt_req_node;
2816
2817         tt_req_node = container_of(ref, struct batadv_tt_req_node, refcount);
2818
2819         kmem_cache_free(batadv_tt_req_cache, tt_req_node);
2820 }
2821
2822 /**
2823  * batadv_tt_req_node_put() - decrement the tt_req_node refcounter and
2824  *  possibly release it
2825  * @tt_req_node: tt_req_node to be free'd
2826  */
2827 static void batadv_tt_req_node_put(struct batadv_tt_req_node *tt_req_node)
2828 {
2829         kref_put(&tt_req_node->refcount, batadv_tt_req_node_release);
2830 }
2831
2832 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2833 {
2834         struct batadv_tt_req_node *node;
2835         struct hlist_node *safe;
2836
2837         spin_lock_bh(&bat_priv->tt.req_list_lock);
2838
2839         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2840                 hlist_del_init(&node->list);
2841                 batadv_tt_req_node_put(node);
2842         }
2843
2844         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2845 }
2846
2847 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2848                                        struct batadv_orig_node *orig_node,
2849                                        const void *tt_buff,
2850                                        u16 tt_buff_len)
2851 {
2852         /* Replace the old buffer only if I received something in the
2853          * last OGM (the OGM could carry no changes)
2854          */
2855         spin_lock_bh(&orig_node->tt_buff_lock);
2856         if (tt_buff_len > 0) {
2857                 kfree(orig_node->tt_buff);
2858                 orig_node->tt_buff_len = 0;
2859                 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2860                 if (orig_node->tt_buff) {
2861                         memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2862                         orig_node->tt_buff_len = tt_buff_len;
2863                 }
2864         }
2865         spin_unlock_bh(&orig_node->tt_buff_lock);
2866 }
2867
2868 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2869 {
2870         struct batadv_tt_req_node *node;
2871         struct hlist_node *safe;
2872
2873         spin_lock_bh(&bat_priv->tt.req_list_lock);
2874         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2875                 if (batadv_has_timed_out(node->issued_at,
2876                                          BATADV_TT_REQUEST_TIMEOUT)) {
2877                         hlist_del_init(&node->list);
2878                         batadv_tt_req_node_put(node);
2879                 }
2880         }
2881         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2882 }
2883
2884 /**
2885  * batadv_tt_req_node_new() - search and possibly create a tt_req_node object
2886  * @bat_priv: the bat priv with all the soft interface information
2887  * @orig_node: orig node this request is being issued for
2888  *
2889  * Return: the pointer to the new tt_req_node struct if no request
2890  * has already been issued for this orig_node, NULL otherwise.
2891  */
2892 static struct batadv_tt_req_node *
2893 batadv_tt_req_node_new(struct batadv_priv *bat_priv,
2894                        struct batadv_orig_node *orig_node)
2895 {
2896         struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2897
2898         spin_lock_bh(&bat_priv->tt.req_list_lock);
2899         hlist_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2900                 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2901                     !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2902                                           BATADV_TT_REQUEST_TIMEOUT))
2903                         goto unlock;
2904         }
2905
2906         tt_req_node = kmem_cache_alloc(batadv_tt_req_cache, GFP_ATOMIC);
2907         if (!tt_req_node)
2908                 goto unlock;
2909
2910         kref_init(&tt_req_node->refcount);
2911         ether_addr_copy(tt_req_node->addr, orig_node->orig);
2912         tt_req_node->issued_at = jiffies;
2913
2914         kref_get(&tt_req_node->refcount);
2915         hlist_add_head(&tt_req_node->list, &bat_priv->tt.req_list);
2916 unlock:
2917         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2918         return tt_req_node;
2919 }
2920
2921 /**
2922  * batadv_tt_local_valid() - verify local tt entry and get flags
2923  * @entry_ptr: to be checked local tt entry
2924  * @data_ptr: not used but definition required to satisfy the callback prototype
2925  * @flags: a pointer to store TT flags for this client to
2926  *
2927  * Checks the validity of the given local TT entry. If it is, then the provided
2928  * flags pointer is updated.
2929  *
2930  * Return: true if the entry is a valid, false otherwise.
2931  */
2932 static bool batadv_tt_local_valid(const void *entry_ptr,
2933                                   const void *data_ptr,
2934                                   u8 *flags)
2935 {
2936         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2937
2938         if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2939                 return false;
2940
2941         if (flags)
2942                 *flags = tt_common_entry->flags;
2943
2944         return true;
2945 }
2946
2947 /**
2948  * batadv_tt_global_valid() - verify global tt entry and get flags
2949  * @entry_ptr: to be checked global tt entry
2950  * @data_ptr: an orig_node object (may be NULL)
2951  * @flags: a pointer to store TT flags for this client to
2952  *
2953  * Checks the validity of the given global TT entry. If it is, then the provided
2954  * flags pointer is updated either with the common (summed) TT flags if data_ptr
2955  * is NULL or the specific, per originator TT flags otherwise.
2956  *
2957  * Return: true if the entry is a valid, false otherwise.
2958  */
2959 static bool batadv_tt_global_valid(const void *entry_ptr,
2960                                    const void *data_ptr,
2961                                    u8 *flags)
2962 {
2963         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2964         const struct batadv_tt_global_entry *tt_global_entry;
2965         const struct batadv_orig_node *orig_node = data_ptr;
2966
2967         if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2968             tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2969                 return false;
2970
2971         tt_global_entry = container_of(tt_common_entry,
2972                                        struct batadv_tt_global_entry,
2973                                        common);
2974
2975         return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node,
2976                                                flags);
2977 }
2978
2979 /**
2980  * batadv_tt_tvlv_generate() - fill the tvlv buff with the tt entries from the
2981  *  specified tt hash
2982  * @bat_priv: the bat priv with all the soft interface information
2983  * @hash: hash table containing the tt entries
2984  * @tt_len: expected tvlv tt data buffer length in number of bytes
2985  * @tvlv_buff: pointer to the buffer to fill with the TT data
2986  * @valid_cb: function to filter tt change entries and to return TT flags
2987  * @cb_data: data passed to the filter function as argument
2988  *
2989  * Fills the tvlv buff with the tt entries from the specified hash. If valid_cb
2990  * is not provided then this becomes a no-op.
2991  */
2992 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2993                                     struct batadv_hashtable *hash,
2994                                     void *tvlv_buff, u16 tt_len,
2995                                     bool (*valid_cb)(const void *,
2996                                                      const void *,
2997                                                      u8 *flags),
2998                                     void *cb_data)
2999 {
3000         struct batadv_tt_common_entry *tt_common_entry;
3001         struct batadv_tvlv_tt_change *tt_change;
3002         struct hlist_head *head;
3003         u16 tt_tot, tt_num_entries = 0;
3004         u8 flags;
3005         bool ret;
3006         u32 i;
3007
3008         tt_tot = batadv_tt_entries(tt_len);
3009         tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
3010
3011         if (!valid_cb)
3012                 return;
3013
3014         rcu_read_lock();
3015         for (i = 0; i < hash->size; i++) {
3016                 head = &hash->table[i];
3017
3018                 hlist_for_each_entry_rcu(tt_common_entry,
3019                                          head, hash_entry) {
3020                         if (tt_tot == tt_num_entries)
3021                                 break;
3022
3023                         ret = valid_cb(tt_common_entry, cb_data, &flags);
3024                         if (!ret)
3025                                 continue;
3026
3027                         ether_addr_copy(tt_change->addr, tt_common_entry->addr);
3028                         tt_change->flags = flags;
3029                         tt_change->vid = htons(tt_common_entry->vid);
3030                         memset(tt_change->reserved, 0,
3031                                sizeof(tt_change->reserved));
3032
3033                         tt_num_entries++;
3034                         tt_change++;
3035                 }
3036         }
3037         rcu_read_unlock();
3038 }
3039
3040 /**
3041  * batadv_tt_global_check_crc() - check if all the CRCs are correct
3042  * @orig_node: originator for which the CRCs have to be checked
3043  * @tt_vlan: pointer to the first tvlv VLAN entry
3044  * @num_vlan: number of tvlv VLAN entries
3045  *
3046  * Return: true if all the received CRCs match the locally stored ones, false
3047  * otherwise
3048  */
3049 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
3050                                        struct batadv_tvlv_tt_vlan_data *tt_vlan,
3051                                        u16 num_vlan)
3052 {
3053         struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
3054         struct batadv_orig_node_vlan *vlan;
3055         int i, orig_num_vlan;
3056         u32 crc;
3057
3058         /* check if each received CRC matches the locally stored one */
3059         for (i = 0; i < num_vlan; i++) {
3060                 tt_vlan_tmp = tt_vlan + i;
3061
3062                 /* if orig_node is a backbone node for this VLAN, don't check
3063                  * the CRC as we ignore all the global entries over it
3064                  */
3065                 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
3066                                                    orig_node->orig,
3067                                                    ntohs(tt_vlan_tmp->vid)))
3068                         continue;
3069
3070                 vlan = batadv_orig_node_vlan_get(orig_node,
3071                                                  ntohs(tt_vlan_tmp->vid));
3072                 if (!vlan)
3073                         return false;
3074
3075                 crc = vlan->tt.crc;
3076                 batadv_orig_node_vlan_put(vlan);
3077
3078                 if (crc != ntohl(tt_vlan_tmp->crc))
3079                         return false;
3080         }
3081
3082         /* check if any excess VLANs exist locally for the originator
3083          * which are not mentioned in the TVLV from the originator.
3084          */
3085         rcu_read_lock();
3086         orig_num_vlan = 0;
3087         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list)
3088                 orig_num_vlan++;
3089         rcu_read_unlock();
3090
3091         if (orig_num_vlan > num_vlan)
3092                 return false;
3093
3094         return true;
3095 }
3096
3097 /**
3098  * batadv_tt_local_update_crc() - update all the local CRCs
3099  * @bat_priv: the bat priv with all the soft interface information
3100  */
3101 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
3102 {
3103         struct batadv_softif_vlan *vlan;
3104
3105         /* recompute the global CRC for each VLAN */
3106         rcu_read_lock();
3107         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
3108                 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
3109         }
3110         rcu_read_unlock();
3111 }
3112
3113 /**
3114  * batadv_tt_global_update_crc() - update all the global CRCs for this orig_node
3115  * @bat_priv: the bat priv with all the soft interface information
3116  * @orig_node: the orig_node for which the CRCs have to be updated
3117  */
3118 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
3119                                         struct batadv_orig_node *orig_node)
3120 {
3121         struct batadv_orig_node_vlan *vlan;
3122         u32 crc;
3123
3124         /* recompute the global CRC for each VLAN */
3125         rcu_read_lock();
3126         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
3127                 /* if orig_node is a backbone node for this VLAN, don't compute
3128                  * the CRC as we ignore all the global entries over it
3129                  */
3130                 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
3131                                                    vlan->vid))
3132                         continue;
3133
3134                 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
3135                 vlan->tt.crc = crc;
3136         }
3137         rcu_read_unlock();
3138 }
3139
3140 /**
3141  * batadv_send_tt_request() - send a TT Request message to a given node
3142  * @bat_priv: the bat priv with all the soft interface information
3143  * @dst_orig_node: the destination of the message
3144  * @ttvn: the version number that the source of the message is looking for
3145  * @tt_vlan: pointer to the first tvlv VLAN object to request
3146  * @num_vlan: number of tvlv VLAN entries
3147  * @full_table: ask for the entire translation table if true, while only for the
3148  *  last TT diff otherwise
3149  *
3150  * Return: true if the TT Request was sent, false otherwise
3151  */
3152 static bool batadv_send_tt_request(struct batadv_priv *bat_priv,
3153                                    struct batadv_orig_node *dst_orig_node,
3154                                    u8 ttvn,
3155                                    struct batadv_tvlv_tt_vlan_data *tt_vlan,
3156                                    u16 num_vlan, bool full_table)
3157 {
3158         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
3159         struct batadv_tt_req_node *tt_req_node = NULL;
3160         struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
3161         struct batadv_hard_iface *primary_if;
3162         bool ret = false;
3163         int i, size;
3164
3165         primary_if = batadv_primary_if_get_selected(bat_priv);
3166         if (!primary_if)
3167                 goto out;
3168
3169         /* The new tt_req will be issued only if I'm not waiting for a
3170          * reply from the same orig_node yet
3171          */
3172         tt_req_node = batadv_tt_req_node_new(bat_priv, dst_orig_node);
3173         if (!tt_req_node)
3174                 goto out;
3175
3176         size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
3177         tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
3178         if (!tvlv_tt_data)
3179                 goto out;
3180
3181         tvlv_tt_data->flags = BATADV_TT_REQUEST;
3182         tvlv_tt_data->ttvn = ttvn;
3183         tvlv_tt_data->num_vlan = htons(num_vlan);
3184
3185         /* send all the CRCs within the request. This is needed by intermediate
3186          * nodes to ensure they have the correct table before replying
3187          */
3188         tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
3189         for (i = 0; i < num_vlan; i++) {
3190                 tt_vlan_req->vid = tt_vlan->vid;
3191                 tt_vlan_req->crc = tt_vlan->crc;
3192
3193                 tt_vlan_req++;
3194                 tt_vlan++;
3195         }
3196
3197         if (full_table)
3198                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
3199
3200         batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
3201                    dst_orig_node->orig, full_table ? 'F' : '.');
3202
3203         batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
3204         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3205                                  dst_orig_node->orig, BATADV_TVLV_TT, 1,
3206                                  tvlv_tt_data, size);
3207         ret = true;
3208
3209 out:
3210         if (primary_if)
3211                 batadv_hardif_put(primary_if);
3212
3213         if (ret && tt_req_node) {
3214                 spin_lock_bh(&bat_priv->tt.req_list_lock);
3215                 if (!hlist_unhashed(&tt_req_node->list)) {
3216                         hlist_del_init(&tt_req_node->list);
3217                         batadv_tt_req_node_put(tt_req_node);
3218                 }
3219                 spin_unlock_bh(&bat_priv->tt.req_list_lock);
3220         }
3221
3222         if (tt_req_node)
3223                 batadv_tt_req_node_put(tt_req_node);
3224
3225         kfree(tvlv_tt_data);
3226         return ret;
3227 }
3228
3229 /**
3230  * batadv_send_other_tt_response() - send reply to tt request concerning another
3231  *  node's translation table
3232  * @bat_priv: the bat priv with all the soft interface information
3233  * @tt_data: tt data containing the tt request information
3234  * @req_src: mac address of tt request sender
3235  * @req_dst: mac address of tt request recipient
3236  *
3237  * Return: true if tt request reply was sent, false otherwise.
3238  */
3239 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
3240                                           struct batadv_tvlv_tt_data *tt_data,
3241                                           u8 *req_src, u8 *req_dst)
3242 {
3243         struct batadv_orig_node *req_dst_orig_node;
3244         struct batadv_orig_node *res_dst_orig_node = NULL;
3245         struct batadv_tvlv_tt_change *tt_change;
3246         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
3247         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3248         bool ret = false, full_table;
3249         u8 orig_ttvn, req_ttvn;
3250         u16 tvlv_len;
3251         s32 tt_len;
3252
3253         batadv_dbg(BATADV_DBG_TT, bat_priv,
3254                    "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
3255                    req_src, tt_data->ttvn, req_dst,
3256                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3257
3258         /* Let's get the orig node of the REAL destination */
3259         req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
3260         if (!req_dst_orig_node)
3261                 goto out;
3262
3263         res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
3264         if (!res_dst_orig_node)
3265                 goto out;
3266
3267         orig_ttvn = (u8)atomic_read(&req_dst_orig_node->last_ttvn);
3268         req_ttvn = tt_data->ttvn;
3269
3270         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3271         /* this node doesn't have the requested data */
3272         if (orig_ttvn != req_ttvn ||
3273             !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
3274                                         ntohs(tt_data->num_vlan)))
3275                 goto out;
3276
3277         /* If the full table has been explicitly requested */
3278         if (tt_data->flags & BATADV_TT_FULL_TABLE ||
3279             !req_dst_orig_node->tt_buff)
3280                 full_table = true;
3281         else
3282                 full_table = false;
3283
3284         /* TT fragmentation hasn't been implemented yet, so send as many
3285          * TT entries fit a single packet as possible only
3286          */
3287         if (!full_table) {
3288                 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
3289                 tt_len = req_dst_orig_node->tt_buff_len;
3290
3291                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
3292                                                               &tvlv_tt_data,
3293                                                               &tt_change,
3294                                                               &tt_len);
3295                 if (!tt_len)
3296                         goto unlock;
3297
3298                 /* Copy the last orig_node's OGM buffer */
3299                 memcpy(tt_change, req_dst_orig_node->tt_buff,
3300                        req_dst_orig_node->tt_buff_len);
3301                 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
3302         } else {
3303                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
3304                  * in the initial part
3305                  */
3306                 tt_len = -1;
3307                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
3308                                                               &tvlv_tt_data,
3309                                                               &tt_change,
3310                                                               &tt_len);
3311                 if (!tt_len)
3312                         goto out;
3313
3314                 /* fill the rest of the tvlv with the real TT entries */
3315                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
3316                                         tt_change, tt_len,
3317                                         batadv_tt_global_valid,
3318                                         req_dst_orig_node);
3319         }
3320
3321         /* Don't send the response, if larger than fragmented packet. */
3322         tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
3323         if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
3324                 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
3325                                          "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
3326                                          res_dst_orig_node->orig);
3327                 goto out;
3328         }
3329
3330         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
3331         tvlv_tt_data->ttvn = req_ttvn;
3332
3333         if (full_table)
3334                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
3335
3336         batadv_dbg(BATADV_DBG_TT, bat_priv,
3337                    "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
3338                    res_dst_orig_node->orig, req_dst_orig_node->orig,
3339                    full_table ? 'F' : '.', req_ttvn);
3340
3341         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
3342
3343         batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
3344                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
3345                                  tvlv_len);
3346
3347         ret = true;
3348         goto out;
3349
3350 unlock:
3351         spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
3352
3353 out:
3354         if (res_dst_orig_node)
3355                 batadv_orig_node_put(res_dst_orig_node);
3356         if (req_dst_orig_node)
3357                 batadv_orig_node_put(req_dst_orig_node);
3358         kfree(tvlv_tt_data);
3359         return ret;
3360 }
3361
3362 /**
3363  * batadv_send_my_tt_response() - send reply to tt request concerning this
3364  *  node's translation table
3365  * @bat_priv: the bat priv with all the soft interface information
3366  * @tt_data: tt data containing the tt request information
3367  * @req_src: mac address of tt request sender
3368  *
3369  * Return: true if tt request reply was sent, false otherwise.
3370  */
3371 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
3372                                        struct batadv_tvlv_tt_data *tt_data,
3373                                        u8 *req_src)
3374 {
3375         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
3376         struct batadv_hard_iface *primary_if = NULL;
3377         struct batadv_tvlv_tt_change *tt_change;
3378         struct batadv_orig_node *orig_node;
3379         u8 my_ttvn, req_ttvn;
3380         u16 tvlv_len;
3381         bool full_table;
3382         s32 tt_len;
3383
3384         batadv_dbg(BATADV_DBG_TT, bat_priv,
3385                    "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
3386                    req_src, tt_data->ttvn,
3387                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3388
3389         spin_lock_bh(&bat_priv->tt.commit_lock);
3390
3391         my_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
3392         req_ttvn = tt_data->ttvn;
3393
3394         orig_node = batadv_orig_hash_find(bat_priv, req_src);
3395         if (!orig_node)
3396                 goto out;
3397
3398         primary_if = batadv_primary_if_get_selected(bat_priv);
3399         if (!primary_if)
3400                 goto out;
3401
3402         /* If the full table has been explicitly requested or the gap
3403          * is too big send the whole local translation table
3404          */
3405         if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
3406             !bat_priv->tt.last_changeset)
3407                 full_table = true;
3408         else
3409                 full_table = false;
3410
3411         /* TT fragmentation hasn't been implemented yet, so send as many
3412          * TT entries fit a single packet as possible only
3413          */
3414         if (!full_table) {
3415                 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
3416
3417                 tt_len = bat_priv->tt.last_changeset_len;
3418                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
3419                                                              &tvlv_tt_data,
3420                                                              &tt_change,
3421                                                              &tt_len);
3422                 if (!tt_len || !tvlv_len)
3423                         goto unlock;
3424
3425                 /* Copy the last orig_node's OGM buffer */
3426                 memcpy(tt_change, bat_priv->tt.last_changeset,
3427                        bat_priv->tt.last_changeset_len);
3428                 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
3429         } else {
3430                 req_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
3431
3432                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
3433                  * in the initial part
3434                  */
3435                 tt_len = -1;
3436                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
3437                                                              &tvlv_tt_data,
3438                                                              &tt_change,
3439                                                              &tt_len);
3440                 if (!tt_len || !tvlv_len)
3441                         goto out;
3442
3443                 /* fill the rest of the tvlv with the real TT entries */
3444                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
3445                                         tt_change, tt_len,
3446                                         batadv_tt_local_valid, NULL);
3447         }
3448
3449         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
3450         tvlv_tt_data->ttvn = req_ttvn;
3451
3452         if (full_table)
3453                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
3454
3455         batadv_dbg(BATADV_DBG_TT, bat_priv,
3456                    "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
3457                    orig_node->orig, full_table ? 'F' : '.', req_ttvn);
3458
3459         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
3460
3461         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3462                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
3463                                  tvlv_len);
3464
3465         goto out;
3466
3467 unlock:
3468         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
3469 out:
3470         spin_unlock_bh(&bat_priv->tt.commit_lock);
3471         if (orig_node)
3472                 batadv_orig_node_put(orig_node);
3473         if (primary_if)
3474                 batadv_hardif_put(primary_if);
3475         kfree(tvlv_tt_data);
3476         /* The packet was for this host, so it doesn't need to be re-routed */
3477         return true;
3478 }
3479
3480 /**
3481  * batadv_send_tt_response() - send reply to tt request
3482  * @bat_priv: the bat priv with all the soft interface information
3483  * @tt_data: tt data containing the tt request information
3484  * @req_src: mac address of tt request sender
3485  * @req_dst: mac address of tt request recipient
3486  *
3487  * Return: true if tt request reply was sent, false otherwise.
3488  */
3489 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
3490                                     struct batadv_tvlv_tt_data *tt_data,
3491                                     u8 *req_src, u8 *req_dst)
3492 {
3493         if (batadv_is_my_mac(bat_priv, req_dst))
3494                 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
3495         return batadv_send_other_tt_response(bat_priv, tt_data, req_src,
3496                                              req_dst);
3497 }
3498
3499 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
3500                                       struct batadv_orig_node *orig_node,
3501                                       struct batadv_tvlv_tt_change *tt_change,
3502                                       u16 tt_num_changes, u8 ttvn)
3503 {
3504         int i;
3505         int roams;
3506
3507         for (i = 0; i < tt_num_changes; i++) {
3508                 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
3509                         roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
3510                         batadv_tt_global_del(bat_priv, orig_node,
3511                                              (tt_change + i)->addr,
3512                                              ntohs((tt_change + i)->vid),
3513                                              "tt removed by changes",
3514                                              roams);
3515                 } else {
3516                         if (!batadv_tt_global_add(bat_priv, orig_node,
3517                                                   (tt_change + i)->addr,
3518                                                   ntohs((tt_change + i)->vid),
3519                                                   (tt_change + i)->flags, ttvn))
3520                                 /* In case of problem while storing a
3521                                  * global_entry, we stop the updating
3522                                  * procedure without committing the
3523                                  * ttvn change. This will avoid to send
3524                                  * corrupted data on tt_request
3525                                  */
3526                                 return;
3527                 }
3528         }
3529         set_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
3530 }
3531
3532 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
3533                                   struct batadv_tvlv_tt_change *tt_change,
3534                                   u8 ttvn, u8 *resp_src,
3535                                   u16 num_entries)
3536 {
3537         struct batadv_orig_node *orig_node;
3538
3539         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
3540         if (!orig_node)
3541                 goto out;
3542
3543         /* Purge the old table first.. */
3544         batadv_tt_global_del_orig(bat_priv, orig_node, -1,
3545                                   "Received full table");
3546
3547         _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
3548                                   ttvn);
3549
3550         spin_lock_bh(&orig_node->tt_buff_lock);
3551         kfree(orig_node->tt_buff);
3552         orig_node->tt_buff_len = 0;
3553         orig_node->tt_buff = NULL;
3554         spin_unlock_bh(&orig_node->tt_buff_lock);
3555
3556         atomic_set(&orig_node->last_ttvn, ttvn);
3557
3558 out:
3559         if (orig_node)
3560                 batadv_orig_node_put(orig_node);
3561 }
3562
3563 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
3564                                      struct batadv_orig_node *orig_node,
3565                                      u16 tt_num_changes, u8 ttvn,
3566                                      struct batadv_tvlv_tt_change *tt_change)
3567 {
3568         _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
3569                                   tt_num_changes, ttvn);
3570
3571         batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
3572                                    batadv_tt_len(tt_num_changes));
3573         atomic_set(&orig_node->last_ttvn, ttvn);
3574 }
3575
3576 /**
3577  * batadv_is_my_client() - check if a client is served by the local node
3578  * @bat_priv: the bat priv with all the soft interface information
3579  * @addr: the mac address of the client to check
3580  * @vid: VLAN identifier
3581  *
3582  * Return: true if the client is served by this node, false otherwise.
3583  */
3584 bool batadv_is_my_client(struct batadv_priv *bat_priv, const u8 *addr,
3585                          unsigned short vid)
3586 {
3587         struct batadv_tt_local_entry *tt_local_entry;
3588         bool ret = false;
3589
3590         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3591         if (!tt_local_entry)
3592                 goto out;
3593         /* Check if the client has been logically deleted (but is kept for
3594          * consistency purpose)
3595          */
3596         if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
3597             (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
3598                 goto out;
3599         ret = true;
3600 out:
3601         if (tt_local_entry)
3602                 batadv_tt_local_entry_put(tt_local_entry);
3603         return ret;
3604 }
3605
3606 /**
3607  * batadv_handle_tt_response() - process incoming tt reply
3608  * @bat_priv: the bat priv with all the soft interface information
3609  * @tt_data: tt data containing the tt request information
3610  * @resp_src: mac address of tt reply sender
3611  * @num_entries: number of tt change entries appended to the tt data
3612  */
3613 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
3614                                       struct batadv_tvlv_tt_data *tt_data,
3615                                       u8 *resp_src, u16 num_entries)
3616 {
3617         struct batadv_tt_req_node *node;
3618         struct hlist_node *safe;
3619         struct batadv_orig_node *orig_node = NULL;
3620         struct batadv_tvlv_tt_change *tt_change;
3621         u8 *tvlv_ptr = (u8 *)tt_data;
3622         u16 change_offset;
3623
3624         batadv_dbg(BATADV_DBG_TT, bat_priv,
3625                    "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
3626                    resp_src, tt_data->ttvn, num_entries,
3627                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3628
3629         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
3630         if (!orig_node)
3631                 goto out;
3632
3633         spin_lock_bh(&orig_node->tt_lock);
3634
3635         change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
3636         change_offset *= ntohs(tt_data->num_vlan);
3637         change_offset += sizeof(*tt_data);
3638         tvlv_ptr += change_offset;
3639
3640         tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
3641         if (tt_data->flags & BATADV_TT_FULL_TABLE) {
3642                 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
3643                                       resp_src, num_entries);
3644         } else {
3645                 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
3646                                          tt_data->ttvn, tt_change);
3647         }
3648
3649         /* Recalculate the CRC for this orig_node and store it */
3650         batadv_tt_global_update_crc(bat_priv, orig_node);
3651
3652         spin_unlock_bh(&orig_node->tt_lock);
3653
3654         /* Delete the tt_req_node from pending tt_requests list */
3655         spin_lock_bh(&bat_priv->tt.req_list_lock);
3656         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
3657                 if (!batadv_compare_eth(node->addr, resp_src))
3658                         continue;
3659                 hlist_del_init(&node->list);
3660                 batadv_tt_req_node_put(node);
3661         }
3662
3663         spin_unlock_bh(&bat_priv->tt.req_list_lock);
3664 out:
3665         if (orig_node)
3666                 batadv_orig_node_put(orig_node);
3667 }
3668
3669 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
3670 {
3671         struct batadv_tt_roam_node *node, *safe;
3672
3673         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3674
3675         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3676                 list_del(&node->list);
3677                 kmem_cache_free(batadv_tt_roam_cache, node);
3678         }
3679
3680         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3681 }
3682
3683 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
3684 {
3685         struct batadv_tt_roam_node *node, *safe;
3686
3687         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3688         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3689                 if (!batadv_has_timed_out(node->first_time,
3690                                           BATADV_ROAMING_MAX_TIME))
3691                         continue;
3692
3693                 list_del(&node->list);
3694                 kmem_cache_free(batadv_tt_roam_cache, node);
3695         }
3696         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3697 }
3698
3699 /**
3700  * batadv_tt_check_roam_count() - check if a client has roamed too frequently
3701  * @bat_priv: the bat priv with all the soft interface information
3702  * @client: mac address of the roaming client
3703  *
3704  * This function checks whether the client already reached the
3705  * maximum number of possible roaming phases. In this case the ROAMING_ADV
3706  * will not be sent.
3707  *
3708  * Return: true if the ROAMING_ADV can be sent, false otherwise
3709  */
3710 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, u8 *client)
3711 {
3712         struct batadv_tt_roam_node *tt_roam_node;
3713         bool ret = false;
3714
3715         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3716         /* The new tt_req will be issued only if I'm not waiting for a
3717          * reply from the same orig_node yet
3718          */
3719         list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
3720                 if (!batadv_compare_eth(tt_roam_node->addr, client))
3721                         continue;
3722
3723                 if (batadv_has_timed_out(tt_roam_node->first_time,
3724                                          BATADV_ROAMING_MAX_TIME))
3725                         continue;
3726
3727                 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
3728                         /* Sorry, you roamed too many times! */
3729                         goto unlock;
3730                 ret = true;
3731                 break;
3732         }
3733
3734         if (!ret) {
3735                 tt_roam_node = kmem_cache_alloc(batadv_tt_roam_cache,
3736                                                 GFP_ATOMIC);
3737                 if (!tt_roam_node)
3738                         goto unlock;
3739
3740                 tt_roam_node->first_time = jiffies;
3741                 atomic_set(&tt_roam_node->counter,
3742                            BATADV_ROAMING_MAX_COUNT - 1);
3743                 ether_addr_copy(tt_roam_node->addr, client);
3744
3745                 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
3746                 ret = true;
3747         }
3748
3749 unlock:
3750         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3751         return ret;
3752 }
3753
3754 /**
3755  * batadv_send_roam_adv() - send a roaming advertisement message
3756  * @bat_priv: the bat priv with all the soft interface information
3757  * @client: mac address of the roaming client
3758  * @vid: VLAN identifier
3759  * @orig_node: message destination
3760  *
3761  * Send a ROAMING_ADV message to the node which was previously serving this
3762  * client. This is done to inform the node that from now on all traffic destined
3763  * for this particular roamed client has to be forwarded to the sender of the
3764  * roaming message.
3765  */
3766 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
3767                                  unsigned short vid,
3768                                  struct batadv_orig_node *orig_node)
3769 {
3770         struct batadv_hard_iface *primary_if;
3771         struct batadv_tvlv_roam_adv tvlv_roam;
3772
3773         primary_if = batadv_primary_if_get_selected(bat_priv);
3774         if (!primary_if)
3775                 goto out;
3776
3777         /* before going on we have to check whether the client has
3778          * already roamed to us too many times
3779          */
3780         if (!batadv_tt_check_roam_count(bat_priv, client))
3781                 goto out;
3782
3783         batadv_dbg(BATADV_DBG_TT, bat_priv,
3784                    "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
3785                    orig_node->orig, client, batadv_print_vid(vid));
3786
3787         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
3788
3789         memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
3790         tvlv_roam.vid = htons(vid);
3791
3792         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3793                                  orig_node->orig, BATADV_TVLV_ROAM, 1,
3794                                  &tvlv_roam, sizeof(tvlv_roam));
3795
3796 out:
3797         if (primary_if)
3798                 batadv_hardif_put(primary_if);
3799 }
3800
3801 static void batadv_tt_purge(struct work_struct *work)
3802 {
3803         struct delayed_work *delayed_work;
3804         struct batadv_priv_tt *priv_tt;
3805         struct batadv_priv *bat_priv;
3806
3807         delayed_work = to_delayed_work(work);
3808         priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
3809         bat_priv = container_of(priv_tt, struct batadv_priv, tt);
3810
3811         batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
3812         batadv_tt_global_purge(bat_priv);
3813         batadv_tt_req_purge(bat_priv);
3814         batadv_tt_roam_purge(bat_priv);
3815
3816         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3817                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3818 }
3819
3820 /**
3821  * batadv_tt_free() - Free translation table of soft interface
3822  * @bat_priv: the bat priv with all the soft interface information
3823  */
3824 void batadv_tt_free(struct batadv_priv *bat_priv)
3825 {
3826         batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_ROAM, 1);
3827
3828         batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
3829         batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
3830
3831         cancel_delayed_work_sync(&bat_priv->tt.work);
3832
3833         batadv_tt_local_table_free(bat_priv);
3834         batadv_tt_global_table_free(bat_priv);
3835         batadv_tt_req_list_free(bat_priv);
3836         batadv_tt_changes_list_free(bat_priv);
3837         batadv_tt_roam_list_free(bat_priv);
3838
3839         kfree(bat_priv->tt.last_changeset);
3840 }
3841
3842 /**
3843  * batadv_tt_local_set_flags() - set or unset the specified flags on the local
3844  *  table and possibly count them in the TT size
3845  * @bat_priv: the bat priv with all the soft interface information
3846  * @flags: the flag to switch
3847  * @enable: whether to set or unset the flag
3848  * @count: whether to increase the TT size by the number of changed entries
3849  */
3850 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv, u16 flags,
3851                                       bool enable, bool count)
3852 {
3853         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3854         struct batadv_tt_common_entry *tt_common_entry;
3855         struct hlist_head *head;
3856         u32 i;
3857
3858         if (!hash)
3859                 return;
3860
3861         for (i = 0; i < hash->size; i++) {
3862                 head = &hash->table[i];
3863
3864                 rcu_read_lock();
3865                 hlist_for_each_entry_rcu(tt_common_entry,
3866                                          head, hash_entry) {
3867                         if (enable) {
3868                                 if ((tt_common_entry->flags & flags) == flags)
3869                                         continue;
3870                                 tt_common_entry->flags |= flags;
3871                         } else {
3872                                 if (!(tt_common_entry->flags & flags))
3873                                         continue;
3874                                 tt_common_entry->flags &= ~flags;
3875                         }
3876
3877                         if (!count)
3878                                 continue;
3879
3880                         batadv_tt_local_size_inc(bat_priv,
3881                                                  tt_common_entry->vid);
3882                 }
3883                 rcu_read_unlock();
3884         }
3885 }
3886
3887 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3888 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3889 {
3890         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3891         struct batadv_tt_common_entry *tt_common;
3892         struct batadv_tt_local_entry *tt_local;
3893         struct hlist_node *node_tmp;
3894         struct hlist_head *head;
3895         spinlock_t *list_lock; /* protects write access to the hash lists */
3896         u32 i;
3897
3898         if (!hash)
3899                 return;
3900
3901         for (i = 0; i < hash->size; i++) {
3902                 head = &hash->table[i];
3903                 list_lock = &hash->list_locks[i];
3904
3905                 spin_lock_bh(list_lock);
3906                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3907                                           hash_entry) {
3908                         if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3909                                 continue;
3910
3911                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3912                                    "Deleting local tt entry (%pM, vid: %d): pending\n",
3913                                    tt_common->addr,
3914                                    batadv_print_vid(tt_common->vid));
3915
3916                         batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3917                         hlist_del_rcu(&tt_common->hash_entry);
3918                         tt_local = container_of(tt_common,
3919                                                 struct batadv_tt_local_entry,
3920                                                 common);
3921
3922                         batadv_tt_local_entry_put(tt_local);
3923                 }
3924                 spin_unlock_bh(list_lock);
3925         }
3926 }
3927
3928 /**
3929  * batadv_tt_local_commit_changes_nolock() - commit all pending local tt changes
3930  *  which have been queued in the time since the last commit
3931  * @bat_priv: the bat priv with all the soft interface information
3932  *
3933  * Caller must hold tt->commit_lock.
3934  */
3935 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3936 {
3937         lockdep_assert_held(&bat_priv->tt.commit_lock);
3938
3939         if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3940                 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3941                         batadv_tt_tvlv_container_update(bat_priv);
3942                 return;
3943         }
3944
3945         batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3946
3947         batadv_tt_local_purge_pending_clients(bat_priv);
3948         batadv_tt_local_update_crc(bat_priv);
3949
3950         /* Increment the TTVN only once per OGM interval */
3951         atomic_inc(&bat_priv->tt.vn);
3952         batadv_dbg(BATADV_DBG_TT, bat_priv,
3953                    "Local changes committed, updating to ttvn %u\n",
3954                    (u8)atomic_read(&bat_priv->tt.vn));
3955
3956         /* reset the sending counter */
3957         atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3958         batadv_tt_tvlv_container_update(bat_priv);
3959 }
3960
3961 /**
3962  * batadv_tt_local_commit_changes() - commit all pending local tt changes which
3963  *  have been queued in the time since the last commit
3964  * @bat_priv: the bat priv with all the soft interface information
3965  */
3966 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3967 {
3968         spin_lock_bh(&bat_priv->tt.commit_lock);
3969         batadv_tt_local_commit_changes_nolock(bat_priv);
3970         spin_unlock_bh(&bat_priv->tt.commit_lock);
3971 }
3972
3973 /**
3974  * batadv_is_ap_isolated() - Check if packet from upper layer should be dropped
3975  * @bat_priv: the bat priv with all the soft interface information
3976  * @src: source mac address of packet
3977  * @dst: destination mac address of packet
3978  * @vid: vlan id of packet
3979  *
3980  * Return: true when src+dst(+vid) pair should be isolated, false otherwise
3981  */
3982 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, u8 *src, u8 *dst,
3983                            unsigned short vid)
3984 {
3985         struct batadv_tt_local_entry *tt_local_entry;
3986         struct batadv_tt_global_entry *tt_global_entry;
3987         struct batadv_softif_vlan *vlan;
3988         bool ret = false;
3989
3990         vlan = batadv_softif_vlan_get(bat_priv, vid);
3991         if (!vlan)
3992                 return false;
3993
3994         if (!atomic_read(&vlan->ap_isolation))
3995                 goto vlan_put;
3996
3997         tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3998         if (!tt_local_entry)
3999                 goto vlan_put;
4000
4001         tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
4002         if (!tt_global_entry)
4003                 goto local_entry_put;
4004
4005         if (_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
4006                 ret = true;
4007
4008         batadv_tt_global_entry_put(tt_global_entry);
4009 local_entry_put:
4010         batadv_tt_local_entry_put(tt_local_entry);
4011 vlan_put:
4012         batadv_softif_vlan_put(vlan);
4013         return ret;
4014 }
4015
4016 /**
4017  * batadv_tt_update_orig() - update global translation table with new tt
4018  *  information received via ogms
4019  * @bat_priv: the bat priv with all the soft interface information
4020  * @orig_node: the orig_node of the ogm
4021  * @tt_buff: pointer to the first tvlv VLAN entry
4022  * @tt_num_vlan: number of tvlv VLAN entries
4023  * @tt_change: pointer to the first entry in the TT buffer
4024  * @tt_num_changes: number of tt changes inside the tt buffer
4025  * @ttvn: translation table version number of this changeset
4026  */
4027 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
4028                                   struct batadv_orig_node *orig_node,
4029                                   const void *tt_buff, u16 tt_num_vlan,
4030                                   struct batadv_tvlv_tt_change *tt_change,
4031                                   u16 tt_num_changes, u8 ttvn)
4032 {
4033         u8 orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn);
4034         struct batadv_tvlv_tt_vlan_data *tt_vlan;
4035         bool full_table = true;
4036         bool has_tt_init;
4037
4038         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
4039         has_tt_init = test_bit(BATADV_ORIG_CAPA_HAS_TT,
4040                                &orig_node->capa_initialized);
4041
4042         /* orig table not initialised AND first diff is in the OGM OR the ttvn
4043          * increased by one -> we can apply the attached changes
4044          */
4045         if ((!has_tt_init && ttvn == 1) || ttvn - orig_ttvn == 1) {
4046                 /* the OGM could not contain the changes due to their size or
4047                  * because they have already been sent BATADV_TT_OGM_APPEND_MAX
4048                  * times.
4049                  * In this case send a tt request
4050                  */
4051                 if (!tt_num_changes) {
4052                         full_table = false;
4053                         goto request_table;
4054                 }
4055
4056                 spin_lock_bh(&orig_node->tt_lock);
4057
4058                 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
4059                                          ttvn, tt_change);
4060
4061                 /* Even if we received the precomputed crc with the OGM, we
4062                  * prefer to recompute it to spot any possible inconsistency
4063                  * in the global table
4064                  */
4065                 batadv_tt_global_update_crc(bat_priv, orig_node);
4066
4067                 spin_unlock_bh(&orig_node->tt_lock);
4068
4069                 /* The ttvn alone is not enough to guarantee consistency
4070                  * because a single value could represent different states
4071                  * (due to the wrap around). Thus a node has to check whether
4072                  * the resulting table (after applying the changes) is still
4073                  * consistent or not. E.g. a node could disconnect while its
4074                  * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
4075                  * checking the CRC value is mandatory to detect the
4076                  * inconsistency
4077                  */
4078                 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
4079                                                 tt_num_vlan))
4080                         goto request_table;
4081         } else {
4082                 /* if we missed more than one change or our tables are not
4083                  * in sync anymore -> request fresh tt data
4084                  */
4085                 if (!has_tt_init || ttvn != orig_ttvn ||
4086                     !batadv_tt_global_check_crc(orig_node, tt_vlan,
4087                                                 tt_num_vlan)) {
4088 request_table:
4089                         batadv_dbg(BATADV_DBG_TT, bat_priv,
4090                                    "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
4091                                    orig_node->orig, ttvn, orig_ttvn,
4092                                    tt_num_changes);
4093                         batadv_send_tt_request(bat_priv, orig_node, ttvn,
4094                                                tt_vlan, tt_num_vlan,
4095                                                full_table);
4096                         return;
4097                 }
4098         }
4099 }
4100
4101 /**
4102  * batadv_tt_global_client_is_roaming() - check if a client is marked as roaming
4103  * @bat_priv: the bat priv with all the soft interface information
4104  * @addr: the mac address of the client to check
4105  * @vid: VLAN identifier
4106  *
4107  * Return: true if we know that the client has moved from its old originator
4108  * to another one. This entry is still kept for consistency purposes and will be
4109  * deleted later by a DEL or because of timeout
4110  */
4111 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
4112                                         u8 *addr, unsigned short vid)
4113 {
4114         struct batadv_tt_global_entry *tt_global_entry;
4115         bool ret = false;
4116
4117         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
4118         if (!tt_global_entry)
4119                 goto out;
4120
4121         ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
4122         batadv_tt_global_entry_put(tt_global_entry);
4123 out:
4124         return ret;
4125 }
4126
4127 /**
4128  * batadv_tt_local_client_is_roaming() - tells whether the client is roaming
4129  * @bat_priv: the bat priv with all the soft interface information
4130  * @addr: the mac address of the local client to query
4131  * @vid: VLAN identifier
4132  *
4133  * Return: true if the local client is known to be roaming (it is not served by
4134  * this node anymore) or not. If yes, the client is still present in the table
4135  * to keep the latter consistent with the node TTVN
4136  */
4137 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
4138                                        u8 *addr, unsigned short vid)
4139 {
4140         struct batadv_tt_local_entry *tt_local_entry;
4141         bool ret = false;
4142
4143         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
4144         if (!tt_local_entry)
4145                 goto out;
4146
4147         ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
4148         batadv_tt_local_entry_put(tt_local_entry);
4149 out:
4150         return ret;
4151 }
4152
4153 /**
4154  * batadv_tt_add_temporary_global_entry() - Add temporary entry to global TT
4155  * @bat_priv: the bat priv with all the soft interface information
4156  * @orig_node: orig node which the temporary entry should be associated with
4157  * @addr: mac address of the client
4158  * @vid: VLAN id of the new temporary global translation table
4159  *
4160  * Return: true when temporary tt entry could be added, false otherwise
4161  */
4162 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
4163                                           struct batadv_orig_node *orig_node,
4164                                           const unsigned char *addr,
4165                                           unsigned short vid)
4166 {
4167         /* ignore loop detect macs, they are not supposed to be in the tt local
4168          * data as well.
4169          */
4170         if (batadv_bla_is_loopdetect_mac(addr))
4171                 return false;
4172
4173         if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
4174                                   BATADV_TT_CLIENT_TEMP,
4175                                   atomic_read(&orig_node->last_ttvn)))
4176                 return false;
4177
4178         batadv_dbg(BATADV_DBG_TT, bat_priv,
4179                    "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
4180                    addr, batadv_print_vid(vid), orig_node->orig);
4181
4182         return true;
4183 }
4184
4185 /**
4186  * batadv_tt_local_resize_to_mtu() - resize the local translation table fit the
4187  *  maximum packet size that can be transported through the mesh
4188  * @soft_iface: netdev struct of the mesh interface
4189  *
4190  * Remove entries older than 'timeout' and half timeout if more entries need
4191  * to be removed.
4192  */
4193 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
4194 {
4195         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
4196         int packet_size_max = atomic_read(&bat_priv->packet_size_max);
4197         int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
4198         bool reduced = false;
4199
4200         spin_lock_bh(&bat_priv->tt.commit_lock);
4201
4202         while (true) {
4203                 table_size = batadv_tt_local_table_transmit_size(bat_priv);
4204                 if (packet_size_max >= table_size)
4205                         break;
4206
4207                 batadv_tt_local_purge(bat_priv, timeout);
4208                 batadv_tt_local_purge_pending_clients(bat_priv);
4209
4210                 timeout /= 2;
4211                 reduced = true;
4212                 net_ratelimited_function(batadv_info, soft_iface,
4213                                          "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
4214                                          packet_size_max);
4215         }
4216
4217         /* commit these changes immediately, to avoid synchronization problem
4218          * with the TTVN
4219          */
4220         if (reduced)
4221                 batadv_tt_local_commit_changes_nolock(bat_priv);
4222
4223         spin_unlock_bh(&bat_priv->tt.commit_lock);
4224 }
4225
4226 /**
4227  * batadv_tt_tvlv_ogm_handler_v1() - process incoming tt tvlv container
4228  * @bat_priv: the bat priv with all the soft interface information
4229  * @orig: the orig_node of the ogm
4230  * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
4231  * @tvlv_value: tvlv buffer containing the gateway data
4232  * @tvlv_value_len: tvlv buffer length
4233  */
4234 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
4235                                           struct batadv_orig_node *orig,
4236                                           u8 flags, void *tvlv_value,
4237                                           u16 tvlv_value_len)
4238 {
4239         struct batadv_tvlv_tt_vlan_data *tt_vlan;
4240         struct batadv_tvlv_tt_change *tt_change;
4241         struct batadv_tvlv_tt_data *tt_data;
4242         u16 num_entries, num_vlan;
4243
4244         if (tvlv_value_len < sizeof(*tt_data))
4245                 return;
4246
4247         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
4248         tvlv_value_len -= sizeof(*tt_data);
4249
4250         num_vlan = ntohs(tt_data->num_vlan);
4251
4252         if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
4253                 return;
4254
4255         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
4256         tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
4257         tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
4258
4259         num_entries = batadv_tt_entries(tvlv_value_len);
4260
4261         batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
4262                               num_entries, tt_data->ttvn);
4263 }
4264
4265 /**
4266  * batadv_tt_tvlv_unicast_handler_v1() - process incoming (unicast) tt tvlv
4267  *  container
4268  * @bat_priv: the bat priv with all the soft interface information
4269  * @src: mac address of tt tvlv sender
4270  * @dst: mac address of tt tvlv recipient
4271  * @tvlv_value: tvlv buffer containing the tt data
4272  * @tvlv_value_len: tvlv buffer length
4273  *
4274  * Return: NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
4275  * otherwise.
4276  */
4277 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
4278                                              u8 *src, u8 *dst,
4279                                              void *tvlv_value,
4280                                              u16 tvlv_value_len)
4281 {
4282         struct batadv_tvlv_tt_data *tt_data;
4283         u16 tt_vlan_len, tt_num_entries;
4284         char tt_flag;
4285         bool ret;
4286
4287         if (tvlv_value_len < sizeof(*tt_data))
4288                 return NET_RX_SUCCESS;
4289
4290         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
4291         tvlv_value_len -= sizeof(*tt_data);
4292
4293         tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
4294         tt_vlan_len *= ntohs(tt_data->num_vlan);
4295
4296         if (tvlv_value_len < tt_vlan_len)
4297                 return NET_RX_SUCCESS;
4298
4299         tvlv_value_len -= tt_vlan_len;
4300         tt_num_entries = batadv_tt_entries(tvlv_value_len);
4301
4302         switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
4303         case BATADV_TT_REQUEST:
4304                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
4305
4306                 /* If this node cannot provide a TT response the tt_request is
4307                  * forwarded
4308                  */
4309                 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
4310                 if (!ret) {
4311                         if (tt_data->flags & BATADV_TT_FULL_TABLE)
4312                                 tt_flag = 'F';
4313                         else
4314                                 tt_flag = '.';
4315
4316                         batadv_dbg(BATADV_DBG_TT, bat_priv,
4317                                    "Routing TT_REQUEST to %pM [%c]\n",
4318                                    dst, tt_flag);
4319                         /* tvlv API will re-route the packet */
4320                         return NET_RX_DROP;
4321                 }
4322                 break;
4323         case BATADV_TT_RESPONSE:
4324                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
4325
4326                 if (batadv_is_my_mac(bat_priv, dst)) {
4327                         batadv_handle_tt_response(bat_priv, tt_data,
4328                                                   src, tt_num_entries);
4329                         return NET_RX_SUCCESS;
4330                 }
4331
4332                 if (tt_data->flags & BATADV_TT_FULL_TABLE)
4333                         tt_flag =  'F';
4334                 else
4335                         tt_flag = '.';
4336
4337                 batadv_dbg(BATADV_DBG_TT, bat_priv,
4338                            "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
4339
4340                 /* tvlv API will re-route the packet */
4341                 return NET_RX_DROP;
4342         }
4343
4344         return NET_RX_SUCCESS;
4345 }
4346
4347 /**
4348  * batadv_roam_tvlv_unicast_handler_v1() - process incoming tt roam tvlv
4349  *  container
4350  * @bat_priv: the bat priv with all the soft interface information
4351  * @src: mac address of tt tvlv sender
4352  * @dst: mac address of tt tvlv recipient
4353  * @tvlv_value: tvlv buffer containing the tt data
4354  * @tvlv_value_len: tvlv buffer length
4355  *
4356  * Return: NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
4357  * otherwise.
4358  */
4359 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
4360                                                u8 *src, u8 *dst,
4361                                                void *tvlv_value,
4362                                                u16 tvlv_value_len)
4363 {
4364         struct batadv_tvlv_roam_adv *roaming_adv;
4365         struct batadv_orig_node *orig_node = NULL;
4366
4367         /* If this node is not the intended recipient of the
4368          * roaming advertisement the packet is forwarded
4369          * (the tvlv API will re-route the packet).
4370          */
4371         if (!batadv_is_my_mac(bat_priv, dst))
4372                 return NET_RX_DROP;
4373
4374         if (tvlv_value_len < sizeof(*roaming_adv))
4375                 goto out;
4376
4377         orig_node = batadv_orig_hash_find(bat_priv, src);
4378         if (!orig_node)
4379                 goto out;
4380
4381         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
4382         roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
4383
4384         batadv_dbg(BATADV_DBG_TT, bat_priv,
4385                    "Received ROAMING_ADV from %pM (client %pM)\n",
4386                    src, roaming_adv->client);
4387
4388         batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
4389                              ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
4390                              atomic_read(&orig_node->last_ttvn) + 1);
4391
4392 out:
4393         if (orig_node)
4394                 batadv_orig_node_put(orig_node);
4395         return NET_RX_SUCCESS;
4396 }
4397
4398 /**
4399  * batadv_tt_init() - initialise the translation table internals
4400  * @bat_priv: the bat priv with all the soft interface information
4401  *
4402  * Return: 0 on success or negative error number in case of failure.
4403  */
4404 int batadv_tt_init(struct batadv_priv *bat_priv)
4405 {
4406         int ret;
4407
4408         /* synchronized flags must be remote */
4409         BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
4410
4411         ret = batadv_tt_local_init(bat_priv);
4412         if (ret < 0)
4413                 return ret;
4414
4415         ret = batadv_tt_global_init(bat_priv);
4416         if (ret < 0)
4417                 return ret;
4418
4419         batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
4420                                      batadv_tt_tvlv_unicast_handler_v1,
4421                                      BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
4422
4423         batadv_tvlv_handler_register(bat_priv, NULL,
4424                                      batadv_roam_tvlv_unicast_handler_v1,
4425                                      BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
4426
4427         INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
4428         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
4429                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
4430
4431         return 1;
4432 }
4433
4434 /**
4435  * batadv_tt_global_is_isolated() - check if a client is marked as isolated
4436  * @bat_priv: the bat priv with all the soft interface information
4437  * @addr: the mac address of the client
4438  * @vid: the identifier of the VLAN where this client is connected
4439  *
4440  * Return: true if the client is marked with the TT_CLIENT_ISOLA flag, false
4441  * otherwise
4442  */
4443 bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
4444                                   const u8 *addr, unsigned short vid)
4445 {
4446         struct batadv_tt_global_entry *tt;
4447         bool ret;
4448
4449         tt = batadv_tt_global_hash_find(bat_priv, addr, vid);
4450         if (!tt)
4451                 return false;
4452
4453         ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA;
4454
4455         batadv_tt_global_entry_put(tt);
4456
4457         return ret;
4458 }
4459
4460 /**
4461  * batadv_tt_cache_init() - Initialize tt memory object cache
4462  *
4463  * Return: 0 on success or negative error number in case of failure.
4464  */
4465 int __init batadv_tt_cache_init(void)
4466 {
4467         size_t tl_size = sizeof(struct batadv_tt_local_entry);
4468         size_t tg_size = sizeof(struct batadv_tt_global_entry);
4469         size_t tt_orig_size = sizeof(struct batadv_tt_orig_list_entry);
4470         size_t tt_change_size = sizeof(struct batadv_tt_change_node);
4471         size_t tt_req_size = sizeof(struct batadv_tt_req_node);
4472         size_t tt_roam_size = sizeof(struct batadv_tt_roam_node);
4473
4474         batadv_tl_cache = kmem_cache_create("batadv_tl_cache", tl_size, 0,
4475                                             SLAB_HWCACHE_ALIGN, NULL);
4476         if (!batadv_tl_cache)
4477                 return -ENOMEM;
4478
4479         batadv_tg_cache = kmem_cache_create("batadv_tg_cache", tg_size, 0,
4480                                             SLAB_HWCACHE_ALIGN, NULL);
4481         if (!batadv_tg_cache)
4482                 goto err_tt_tl_destroy;
4483
4484         batadv_tt_orig_cache = kmem_cache_create("batadv_tt_orig_cache",
4485                                                  tt_orig_size, 0,
4486                                                  SLAB_HWCACHE_ALIGN, NULL);
4487         if (!batadv_tt_orig_cache)
4488                 goto err_tt_tg_destroy;
4489
4490         batadv_tt_change_cache = kmem_cache_create("batadv_tt_change_cache",
4491                                                    tt_change_size, 0,
4492                                                    SLAB_HWCACHE_ALIGN, NULL);
4493         if (!batadv_tt_change_cache)
4494                 goto err_tt_orig_destroy;
4495
4496         batadv_tt_req_cache = kmem_cache_create("batadv_tt_req_cache",
4497                                                 tt_req_size, 0,
4498                                                 SLAB_HWCACHE_ALIGN, NULL);
4499         if (!batadv_tt_req_cache)
4500                 goto err_tt_change_destroy;
4501
4502         batadv_tt_roam_cache = kmem_cache_create("batadv_tt_roam_cache",
4503                                                  tt_roam_size, 0,
4504                                                  SLAB_HWCACHE_ALIGN, NULL);
4505         if (!batadv_tt_roam_cache)
4506                 goto err_tt_req_destroy;
4507
4508         return 0;
4509
4510 err_tt_req_destroy:
4511         kmem_cache_destroy(batadv_tt_req_cache);
4512         batadv_tt_req_cache = NULL;
4513 err_tt_change_destroy:
4514         kmem_cache_destroy(batadv_tt_change_cache);
4515         batadv_tt_change_cache = NULL;
4516 err_tt_orig_destroy:
4517         kmem_cache_destroy(batadv_tt_orig_cache);
4518         batadv_tt_orig_cache = NULL;
4519 err_tt_tg_destroy:
4520         kmem_cache_destroy(batadv_tg_cache);
4521         batadv_tg_cache = NULL;
4522 err_tt_tl_destroy:
4523         kmem_cache_destroy(batadv_tl_cache);
4524         batadv_tl_cache = NULL;
4525
4526         return -ENOMEM;
4527 }
4528
4529 /**
4530  * batadv_tt_cache_destroy() - Destroy tt memory object cache
4531  */
4532 void batadv_tt_cache_destroy(void)
4533 {
4534         kmem_cache_destroy(batadv_tl_cache);
4535         kmem_cache_destroy(batadv_tg_cache);
4536         kmem_cache_destroy(batadv_tt_orig_cache);
4537         kmem_cache_destroy(batadv_tt_change_cache);
4538         kmem_cache_destroy(batadv_tt_req_cache);
4539         kmem_cache_destroy(batadv_tt_roam_cache);
4540 }