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

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

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