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TOMOYO Linux Cross Reference
Linux/net/batman-adv/translation-table.c

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

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