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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 /**
1553  * batadv_tt_global_sync_flags - update TT sync flags
1554  * @tt_global: the TT global entry to update sync flags in
1555  *
1556  * Updates the sync flag bits in the tt_global flag attribute with a logical
1557  * OR of all sync flags from any of its TT orig entries.
1558  */
1559 static void
1560 batadv_tt_global_sync_flags(struct batadv_tt_global_entry *tt_global)
1561 {
1562         struct batadv_tt_orig_list_entry *orig_entry;
1563         const struct hlist_head *head;
1564         u16 flags = BATADV_NO_FLAGS;
1565 
1566         rcu_read_lock();
1567         head = &tt_global->orig_list;
1568         hlist_for_each_entry_rcu(orig_entry, head, list)
1569                 flags |= orig_entry->flags;
1570         rcu_read_unlock();
1571 
1572         flags |= tt_global->common.flags & (~BATADV_TT_SYNC_MASK);
1573         tt_global->common.flags = flags;
1574 }
1575 
1576 /**
1577  * batadv_tt_global_orig_entry_add - add or update a TT orig entry
1578  * @tt_global: the TT global entry to add an orig entry in
1579  * @orig_node: the originator to add an orig entry for
1580  * @ttvn: translation table version number of this changeset
1581  * @flags: TT sync flags
1582  */
1583 static void
1584 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
1585                                 struct batadv_orig_node *orig_node, int ttvn,
1586                                 u8 flags)
1587 {
1588         struct batadv_tt_orig_list_entry *orig_entry;
1589 
1590         orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
1591         if (orig_entry) {
1592                 /* refresh the ttvn: the current value could be a bogus one that
1593                  * was added during a "temporary client detection"
1594                  */
1595                 orig_entry->ttvn = ttvn;
1596                 orig_entry->flags = flags;
1597                 goto sync_flags;
1598         }
1599 
1600         orig_entry = kmem_cache_zalloc(batadv_tt_orig_cache, GFP_ATOMIC);
1601         if (!orig_entry)
1602                 goto out;
1603 
1604         INIT_HLIST_NODE(&orig_entry->list);
1605         kref_get(&orig_node->refcount);
1606         batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
1607         orig_entry->orig_node = orig_node;
1608         orig_entry->ttvn = ttvn;
1609         orig_entry->flags = flags;
1610         kref_init(&orig_entry->refcount);
1611 
1612         spin_lock_bh(&tt_global->list_lock);
1613         kref_get(&orig_entry->refcount);
1614         hlist_add_head_rcu(&orig_entry->list,
1615                            &tt_global->orig_list);
1616         spin_unlock_bh(&tt_global->list_lock);
1617         atomic_inc(&tt_global->orig_list_count);
1618 
1619 sync_flags:
1620         batadv_tt_global_sync_flags(tt_global);
1621 out:
1622         if (orig_entry)
1623                 batadv_tt_orig_list_entry_put(orig_entry);
1624 }
1625 
1626 /**
1627  * batadv_tt_global_add - add a new TT global entry or update an existing one
1628  * @bat_priv: the bat priv with all the soft interface information
1629  * @orig_node: the originator announcing the client
1630  * @tt_addr: the mac address of the non-mesh client
1631  * @vid: VLAN identifier
1632  * @flags: TT flags that have to be set for this non-mesh client
1633  * @ttvn: the tt version number ever announcing this non-mesh client
1634  *
1635  * Add a new TT global entry for the given originator. If the entry already
1636  * exists add a new reference to the given originator (a global entry can have
1637  * references to multiple originators) and adjust the flags attribute to reflect
1638  * the function argument.
1639  * If a TT local entry exists for this non-mesh client remove it.
1640  *
1641  * The caller must hold orig_node refcount.
1642  *
1643  * Return: true if the new entry has been added, false otherwise
1644  */
1645 static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
1646                                  struct batadv_orig_node *orig_node,
1647                                  const unsigned char *tt_addr,
1648                                  unsigned short vid, u16 flags, u8 ttvn)
1649 {
1650         struct batadv_tt_global_entry *tt_global_entry;
1651         struct batadv_tt_local_entry *tt_local_entry;
1652         bool ret = false;
1653         int hash_added;
1654         struct batadv_tt_common_entry *common;
1655         u16 local_flags;
1656 
1657         /* ignore global entries from backbone nodes */
1658         if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
1659                 return true;
1660 
1661         tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
1662         tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
1663 
1664         /* if the node already has a local client for this entry, it has to wait
1665          * for a roaming advertisement instead of manually messing up the global
1666          * table
1667          */
1668         if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
1669             !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
1670                 goto out;
1671 
1672         if (!tt_global_entry) {
1673                 tt_global_entry = kmem_cache_zalloc(batadv_tg_cache,
1674                                                     GFP_ATOMIC);
1675                 if (!tt_global_entry)
1676                         goto out;
1677 
1678                 common = &tt_global_entry->common;
1679                 ether_addr_copy(common->addr, tt_addr);
1680                 common->vid = vid;
1681 
1682                 common->flags = flags;
1683                 tt_global_entry->roam_at = 0;
1684                 /* node must store current time in case of roaming. This is
1685                  * needed to purge this entry out on timeout (if nobody claims
1686                  * it)
1687                  */
1688                 if (flags & BATADV_TT_CLIENT_ROAM)
1689                         tt_global_entry->roam_at = jiffies;
1690                 kref_init(&common->refcount);
1691                 common->added_at = jiffies;
1692 
1693                 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
1694                 atomic_set(&tt_global_entry->orig_list_count, 0);
1695                 spin_lock_init(&tt_global_entry->list_lock);
1696 
1697                 kref_get(&common->refcount);
1698                 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
1699                                              batadv_compare_tt,
1700                                              batadv_choose_tt, common,
1701                                              &common->hash_entry);
1702 
1703                 if (unlikely(hash_added != 0)) {
1704                         /* remove the reference for the hash */
1705                         batadv_tt_global_entry_put(tt_global_entry);
1706                         goto out_remove;
1707                 }
1708         } else {
1709                 common = &tt_global_entry->common;
1710                 /* If there is already a global entry, we can use this one for
1711                  * our processing.
1712                  * But if we are trying to add a temporary client then here are
1713                  * two options at this point:
1714                  * 1) the global client is not a temporary client: the global
1715                  *    client has to be left as it is, temporary information
1716                  *    should never override any already known client state
1717                  * 2) the global client is a temporary client: purge the
1718                  *    originator list and add the new one orig_entry
1719                  */
1720                 if (flags & BATADV_TT_CLIENT_TEMP) {
1721                         if (!(common->flags & BATADV_TT_CLIENT_TEMP))
1722                                 goto out;
1723                         if (batadv_tt_global_entry_has_orig(tt_global_entry,
1724                                                             orig_node))
1725                                 goto out_remove;
1726                         batadv_tt_global_del_orig_list(tt_global_entry);
1727                         goto add_orig_entry;
1728                 }
1729 
1730                 /* if the client was temporary added before receiving the first
1731                  * OGM announcing it, we have to clear the TEMP flag. Also,
1732                  * remove the previous temporary orig node and re-add it
1733                  * if required. If the orig entry changed, the new one which
1734                  * is a non-temporary entry is preferred.
1735                  */
1736                 if (common->flags & BATADV_TT_CLIENT_TEMP) {
1737                         batadv_tt_global_del_orig_list(tt_global_entry);
1738                         common->flags &= ~BATADV_TT_CLIENT_TEMP;
1739                 }
1740 
1741                 /* the change can carry possible "attribute" flags like the
1742                  * TT_CLIENT_TEMP, therefore they have to be copied in the
1743                  * client entry
1744                  */
1745                 common->flags |= flags & (~BATADV_TT_SYNC_MASK);
1746 
1747                 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1748                  * one originator left in the list and we previously received a
1749                  * delete + roaming change for this originator.
1750                  *
1751                  * We should first delete the old originator before adding the
1752                  * new one.
1753                  */
1754                 if (common->flags & BATADV_TT_CLIENT_ROAM) {
1755                         batadv_tt_global_del_orig_list(tt_global_entry);
1756                         common->flags &= ~BATADV_TT_CLIENT_ROAM;
1757                         tt_global_entry->roam_at = 0;
1758                 }
1759         }
1760 add_orig_entry:
1761         /* add the new orig_entry (if needed) or update it */
1762         batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn,
1763                                         flags & BATADV_TT_SYNC_MASK);
1764 
1765         batadv_dbg(BATADV_DBG_TT, bat_priv,
1766                    "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1767                    common->addr, batadv_print_vid(common->vid),
1768                    orig_node->orig);
1769         ret = true;
1770 
1771 out_remove:
1772         /* Do not remove multicast addresses from the local hash on
1773          * global additions
1774          */
1775         if (is_multicast_ether_addr(tt_addr))
1776                 goto out;
1777 
1778         /* remove address from local hash if present */
1779         local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
1780                                              "global tt received",
1781                                              flags & BATADV_TT_CLIENT_ROAM);
1782         tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
1783 
1784         if (!(flags & BATADV_TT_CLIENT_ROAM))
1785                 /* this is a normal global add. Therefore the client is not in a
1786                  * roaming state anymore.
1787                  */
1788                 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
1789 
1790 out:
1791         if (tt_global_entry)
1792                 batadv_tt_global_entry_put(tt_global_entry);
1793         if (tt_local_entry)
1794                 batadv_tt_local_entry_put(tt_local_entry);
1795         return ret;
1796 }
1797 
1798 /**
1799  * batadv_transtable_best_orig - Get best originator list entry from tt entry
1800  * @bat_priv: the bat priv with all the soft interface information
1801  * @tt_global_entry: global translation table entry to be analyzed
1802  *
1803  * This functon assumes the caller holds rcu_read_lock().
1804  * Return: best originator list entry or NULL on errors.
1805  */
1806 static struct batadv_tt_orig_list_entry *
1807 batadv_transtable_best_orig(struct batadv_priv *bat_priv,
1808                             struct batadv_tt_global_entry *tt_global_entry)
1809 {
1810         struct batadv_neigh_node *router, *best_router = NULL;
1811         struct batadv_algo_ops *bao = bat_priv->algo_ops;
1812         struct hlist_head *head;
1813         struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
1814 
1815         head = &tt_global_entry->orig_list;
1816         hlist_for_each_entry_rcu(orig_entry, head, list) {
1817                 router = batadv_orig_router_get(orig_entry->orig_node,
1818                                                 BATADV_IF_DEFAULT);
1819                 if (!router)
1820                         continue;
1821 
1822                 if (best_router &&
1823                     bao->neigh.cmp(router, BATADV_IF_DEFAULT, best_router,
1824                                    BATADV_IF_DEFAULT) <= 0) {
1825                         batadv_neigh_node_put(router);
1826                         continue;
1827                 }
1828 
1829                 /* release the refcount for the "old" best */
1830                 if (best_router)
1831                         batadv_neigh_node_put(best_router);
1832 
1833                 best_entry = orig_entry;
1834                 best_router = router;
1835         }
1836 
1837         if (best_router)
1838                 batadv_neigh_node_put(best_router);
1839 
1840         return best_entry;
1841 }
1842 
1843 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
1844 /**
1845  * batadv_tt_global_print_entry - print all orig nodes who announce the address
1846  *  for this global entry
1847  * @bat_priv: the bat priv with all the soft interface information
1848  * @tt_global_entry: global translation table entry to be printed
1849  * @seq: debugfs table seq_file struct
1850  *
1851  * This functon assumes the caller holds rcu_read_lock().
1852  */
1853 static void
1854 batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
1855                              struct batadv_tt_global_entry *tt_global_entry,
1856                              struct seq_file *seq)
1857 {
1858         struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
1859         struct batadv_tt_common_entry *tt_common_entry;
1860         struct batadv_orig_node_vlan *vlan;
1861         struct hlist_head *head;
1862         u8 last_ttvn;
1863         u16 flags;
1864 
1865         tt_common_entry = &tt_global_entry->common;
1866         flags = tt_common_entry->flags;
1867 
1868         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1869         if (best_entry) {
1870                 vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
1871                                                  tt_common_entry->vid);
1872                 if (!vlan) {
1873                         seq_printf(seq,
1874                                    " * Cannot retrieve VLAN %d for originator %pM\n",
1875                                    batadv_print_vid(tt_common_entry->vid),
1876                                    best_entry->orig_node->orig);
1877                         goto print_list;
1878                 }
1879 
1880                 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
1881                 seq_printf(seq,
1882                            " %c %pM %4i   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1883                            '*', tt_global_entry->common.addr,
1884                            batadv_print_vid(tt_global_entry->common.vid),
1885                            best_entry->ttvn, best_entry->orig_node->orig,
1886                            last_ttvn, vlan->tt.crc,
1887                            ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1888                            ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1889                            ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1890                            ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1891 
1892                 batadv_orig_node_vlan_put(vlan);
1893         }
1894 
1895 print_list:
1896         head = &tt_global_entry->orig_list;
1897 
1898         hlist_for_each_entry_rcu(orig_entry, head, list) {
1899                 if (best_entry == orig_entry)
1900                         continue;
1901 
1902                 vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
1903                                                  tt_common_entry->vid);
1904                 if (!vlan) {
1905                         seq_printf(seq,
1906                                    " + Cannot retrieve VLAN %d for originator %pM\n",
1907                                    batadv_print_vid(tt_common_entry->vid),
1908                                    orig_entry->orig_node->orig);
1909                         continue;
1910                 }
1911 
1912                 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
1913                 seq_printf(seq,
1914                            " %c %pM %4d   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1915                            '+', tt_global_entry->common.addr,
1916                            batadv_print_vid(tt_global_entry->common.vid),
1917                            orig_entry->ttvn, orig_entry->orig_node->orig,
1918                            last_ttvn, vlan->tt.crc,
1919                            ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1920                            ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1921                            ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1922                            ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1923 
1924                 batadv_orig_node_vlan_put(vlan);
1925         }
1926 }
1927 
1928 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
1929 {
1930         struct net_device *net_dev = (struct net_device *)seq->private;
1931         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1932         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1933         struct batadv_tt_common_entry *tt_common_entry;
1934         struct batadv_tt_global_entry *tt_global;
1935         struct batadv_hard_iface *primary_if;
1936         struct hlist_head *head;
1937         u32 i;
1938 
1939         primary_if = batadv_seq_print_text_primary_if_get(seq);
1940         if (!primary_if)
1941                 goto out;
1942 
1943         seq_printf(seq,
1944                    "Globally announced TT entries received via the mesh %s\n",
1945                    net_dev->name);
1946         seq_puts(seq,
1947                  "       Client         VID  (TTVN)       Originator      (Curr TTVN) (CRC       ) Flags\n");
1948 
1949         for (i = 0; i < hash->size; i++) {
1950                 head = &hash->table[i];
1951 
1952                 rcu_read_lock();
1953                 hlist_for_each_entry_rcu(tt_common_entry,
1954                                          head, hash_entry) {
1955                         tt_global = container_of(tt_common_entry,
1956                                                  struct batadv_tt_global_entry,
1957                                                  common);
1958                         batadv_tt_global_print_entry(bat_priv, tt_global, seq);
1959                 }
1960                 rcu_read_unlock();
1961         }
1962 out:
1963         if (primary_if)
1964                 batadv_hardif_put(primary_if);
1965         return 0;
1966 }
1967 #endif
1968 
1969 /**
1970  * batadv_tt_global_dump_subentry - Dump all TT local entries into a message
1971  * @msg: Netlink message to dump into
1972  * @portid: Port making netlink request
1973  * @seq: Sequence number of netlink message
1974  * @common: tt local & tt global common data
1975  * @orig: Originator node announcing a non-mesh client
1976  * @best: Is the best originator for the TT entry
1977  *
1978  * Return: Error code, or 0 on success
1979  */
1980 static int
1981 batadv_tt_global_dump_subentry(struct sk_buff *msg, u32 portid, u32 seq,
1982                                struct batadv_tt_common_entry *common,
1983                                struct batadv_tt_orig_list_entry *orig,
1984                                bool best)
1985 {
1986         u16 flags = (common->flags & (~BATADV_TT_SYNC_MASK)) | orig->flags;
1987         void *hdr;
1988         struct batadv_orig_node_vlan *vlan;
1989         u8 last_ttvn;
1990         u32 crc;
1991 
1992         vlan = batadv_orig_node_vlan_get(orig->orig_node,
1993                                          common->vid);
1994         if (!vlan)
1995                 return 0;
1996 
1997         crc = vlan->tt.crc;
1998 
1999         batadv_orig_node_vlan_put(vlan);
2000 
2001         hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
2002                           NLM_F_MULTI,
2003                           BATADV_CMD_GET_TRANSTABLE_GLOBAL);
2004         if (!hdr)
2005                 return -ENOBUFS;
2006 
2007         last_ttvn = atomic_read(&orig->orig_node->last_ttvn);
2008 
2009         if (nla_put(msg, BATADV_ATTR_TT_ADDRESS, ETH_ALEN, common->addr) ||
2010             nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,
2011                     orig->orig_node->orig) ||
2012             nla_put_u8(msg, BATADV_ATTR_TT_TTVN, orig->ttvn) ||
2013             nla_put_u8(msg, BATADV_ATTR_TT_LAST_TTVN, last_ttvn) ||
2014             nla_put_u32(msg, BATADV_ATTR_TT_CRC32, crc) ||
2015             nla_put_u16(msg, BATADV_ATTR_TT_VID, common->vid) ||
2016             nla_put_u32(msg, BATADV_ATTR_TT_FLAGS, flags))
2017                 goto nla_put_failure;
2018 
2019         if (best && nla_put_flag(msg, BATADV_ATTR_FLAG_BEST))
2020                 goto nla_put_failure;
2021 
2022         genlmsg_end(msg, hdr);
2023         return 0;
2024 
2025  nla_put_failure:
2026         genlmsg_cancel(msg, hdr);
2027         return -EMSGSIZE;
2028 }
2029 
2030 /**
2031  * batadv_tt_global_dump_entry - Dump one TT global entry into a message
2032  * @msg: Netlink message to dump into
2033  * @portid: Port making netlink request
2034  * @seq: Sequence number of netlink message
2035  * @bat_priv: The bat priv with all the soft interface information
2036  * @common: tt local & tt global common data
2037  * @sub_s: Number of entries to skip
2038  *
2039  * This function assumes the caller holds rcu_read_lock().
2040  *
2041  * Return: Error code, or 0 on success
2042  */
2043 static int
2044 batadv_tt_global_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
2045                             struct batadv_priv *bat_priv,
2046                             struct batadv_tt_common_entry *common, int *sub_s)
2047 {
2048         struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
2049         struct batadv_tt_global_entry *global;
2050         struct hlist_head *head;
2051         int sub = 0;
2052         bool best;
2053 
2054         global = container_of(common, struct batadv_tt_global_entry, common);
2055         best_entry = batadv_transtable_best_orig(bat_priv, global);
2056         head = &global->orig_list;
2057 
2058         hlist_for_each_entry_rcu(orig_entry, head, list) {
2059                 if (sub++ < *sub_s)
2060                         continue;
2061 
2062                 best = (orig_entry == best_entry);
2063 
2064                 if (batadv_tt_global_dump_subentry(msg, portid, seq, common,
2065                                                    orig_entry, best)) {
2066                         *sub_s = sub - 1;
2067                         return -EMSGSIZE;
2068                 }
2069         }
2070 
2071         *sub_s = 0;
2072         return 0;
2073 }
2074 
2075 /**
2076  * batadv_tt_global_dump_bucket - Dump one TT local bucket into a message
2077  * @msg: Netlink message to dump into
2078  * @portid: Port making netlink request
2079  * @seq: Sequence number of netlink message
2080  * @bat_priv: The bat priv with all the soft interface information
2081  * @head: Pointer to the list containing the global tt entries
2082  * @idx_s: Number of entries to skip
2083  * @sub: Number of entries to skip
2084  *
2085  * Return: Error code, or 0 on success
2086  */
2087 static int
2088 batadv_tt_global_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
2089                              struct batadv_priv *bat_priv,
2090                              struct hlist_head *head, int *idx_s, int *sub)
2091 {
2092         struct batadv_tt_common_entry *common;
2093         int idx = 0;
2094 
2095         rcu_read_lock();
2096         hlist_for_each_entry_rcu(common, head, hash_entry) {
2097                 if (idx++ < *idx_s)
2098                         continue;
2099 
2100                 if (batadv_tt_global_dump_entry(msg, portid, seq, bat_priv,
2101                                                 common, sub)) {
2102                         rcu_read_unlock();
2103                         *idx_s = idx - 1;
2104                         return -EMSGSIZE;
2105                 }
2106         }
2107         rcu_read_unlock();
2108 
2109         *idx_s = 0;
2110         *sub = 0;
2111         return 0;
2112 }
2113 
2114 /**
2115  * batadv_tt_global_dump -  Dump TT global entries into a message
2116  * @msg: Netlink message to dump into
2117  * @cb: Parameters from query
2118  *
2119  * Return: Error code, or length of message on success
2120  */
2121 int batadv_tt_global_dump(struct sk_buff *msg, struct netlink_callback *cb)
2122 {
2123         struct net *net = sock_net(cb->skb->sk);
2124         struct net_device *soft_iface;
2125         struct batadv_priv *bat_priv;
2126         struct batadv_hard_iface *primary_if = NULL;
2127         struct batadv_hashtable *hash;
2128         struct hlist_head *head;
2129         int ret;
2130         int ifindex;
2131         int bucket = cb->args[0];
2132         int idx = cb->args[1];
2133         int sub = cb->args[2];
2134         int portid = NETLINK_CB(cb->skb).portid;
2135 
2136         ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
2137         if (!ifindex)
2138                 return -EINVAL;
2139 
2140         soft_iface = dev_get_by_index(net, ifindex);
2141         if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
2142                 ret = -ENODEV;
2143                 goto out;
2144         }
2145 
2146         bat_priv = netdev_priv(soft_iface);
2147 
2148         primary_if = batadv_primary_if_get_selected(bat_priv);
2149         if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
2150                 ret = -ENOENT;
2151                 goto out;
2152         }
2153 
2154         hash = bat_priv->tt.global_hash;
2155 
2156         while (bucket < hash->size) {
2157                 head = &hash->table[bucket];
2158 
2159                 if (batadv_tt_global_dump_bucket(msg, portid,
2160                                                  cb->nlh->nlmsg_seq, bat_priv,
2161                                                  head, &idx, &sub))
2162                         break;
2163 
2164                 bucket++;
2165         }
2166 
2167         ret = msg->len;
2168 
2169  out:
2170         if (primary_if)
2171                 batadv_hardif_put(primary_if);
2172         if (soft_iface)
2173                 dev_put(soft_iface);
2174 
2175         cb->args[0] = bucket;
2176         cb->args[1] = idx;
2177         cb->args[2] = sub;
2178 
2179         return ret;
2180 }
2181 
2182 /**
2183  * _batadv_tt_global_del_orig_entry - remove and free an orig_entry
2184  * @tt_global_entry: the global entry to remove the orig_entry from
2185  * @orig_entry: the orig entry to remove and free
2186  *
2187  * Remove an orig_entry from its list in the given tt_global_entry and
2188  * free this orig_entry afterwards.
2189  *
2190  * Caller must hold tt_global_entry->list_lock and ensure orig_entry->list is
2191  * part of a list.
2192  */
2193 static void
2194 _batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
2195                                  struct batadv_tt_orig_list_entry *orig_entry)
2196 {
2197         lockdep_assert_held(&tt_global_entry->list_lock);
2198 
2199         batadv_tt_global_size_dec(orig_entry->orig_node,
2200                                   tt_global_entry->common.vid);
2201         atomic_dec(&tt_global_entry->orig_list_count);
2202         /* requires holding tt_global_entry->list_lock and orig_entry->list
2203          * being part of a list
2204          */
2205         hlist_del_rcu(&orig_entry->list);
2206         batadv_tt_orig_list_entry_put(orig_entry);
2207 }
2208 
2209 /* deletes the orig list of a tt_global_entry */
2210 static void
2211 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
2212 {
2213         struct hlist_head *head;
2214         struct hlist_node *safe;
2215         struct batadv_tt_orig_list_entry *orig_entry;
2216 
2217         spin_lock_bh(&tt_global_entry->list_lock);
2218         head = &tt_global_entry->orig_list;
2219         hlist_for_each_entry_safe(orig_entry, safe, head, list)
2220                 _batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
2221         spin_unlock_bh(&tt_global_entry->list_lock);
2222 }
2223 
2224 /**
2225  * batadv_tt_global_del_orig_node - remove orig_node from a global tt entry
2226  * @bat_priv: the bat priv with all the soft interface information
2227  * @tt_global_entry: the global entry to remove the orig_node from
2228  * @orig_node: the originator announcing the client
2229  * @message: message to append to the log on deletion
2230  *
2231  * Remove the given orig_node and its according orig_entry from the given
2232  * global tt entry.
2233  */
2234 static void
2235 batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
2236                                struct batadv_tt_global_entry *tt_global_entry,
2237                                struct batadv_orig_node *orig_node,
2238                                const char *message)
2239 {
2240         struct hlist_head *head;
2241         struct hlist_node *safe;
2242         struct batadv_tt_orig_list_entry *orig_entry;
2243         unsigned short vid;
2244 
2245         spin_lock_bh(&tt_global_entry->list_lock);
2246         head = &tt_global_entry->orig_list;
2247         hlist_for_each_entry_safe(orig_entry, safe, head, list) {
2248                 if (orig_entry->orig_node == orig_node) {
2249                         vid = tt_global_entry->common.vid;
2250                         batadv_dbg(BATADV_DBG_TT, bat_priv,
2251                                    "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
2252                                    orig_node->orig,
2253                                    tt_global_entry->common.addr,
2254                                    batadv_print_vid(vid), message);
2255                         _batadv_tt_global_del_orig_entry(tt_global_entry,
2256                                                          orig_entry);
2257                 }
2258         }
2259         spin_unlock_bh(&tt_global_entry->list_lock);
2260 }
2261 
2262 /* If the client is to be deleted, we check if it is the last origantor entry
2263  * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
2264  * timer, otherwise we simply remove the originator scheduled for deletion.
2265  */
2266 static void
2267 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
2268                              struct batadv_tt_global_entry *tt_global_entry,
2269                              struct batadv_orig_node *orig_node,
2270                              const char *message)
2271 {
2272         bool last_entry = true;
2273         struct hlist_head *head;
2274         struct batadv_tt_orig_list_entry *orig_entry;
2275 
2276         /* no local entry exists, case 1:
2277          * Check if this is the last one or if other entries exist.
2278          */
2279 
2280         rcu_read_lock();
2281         head = &tt_global_entry->orig_list;
2282         hlist_for_each_entry_rcu(orig_entry, head, list) {
2283                 if (orig_entry->orig_node != orig_node) {
2284                         last_entry = false;
2285                         break;
2286                 }
2287         }
2288         rcu_read_unlock();
2289 
2290         if (last_entry) {
2291                 /* its the last one, mark for roaming. */
2292                 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
2293                 tt_global_entry->roam_at = jiffies;
2294         } else {
2295                 /* there is another entry, we can simply delete this
2296                  * one and can still use the other one.
2297                  */
2298                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
2299                                                orig_node, message);
2300         }
2301 }
2302 
2303 /**
2304  * batadv_tt_global_del - remove a client from the global table
2305  * @bat_priv: the bat priv with all the soft interface information
2306  * @orig_node: an originator serving this client
2307  * @addr: the mac address of the client
2308  * @vid: VLAN identifier
2309  * @message: a message explaining the reason for deleting the client to print
2310  *  for debugging purpose
2311  * @roaming: true if the deletion has been triggered by a roaming event
2312  */
2313 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
2314                                  struct batadv_orig_node *orig_node,
2315                                  const unsigned char *addr, unsigned short vid,
2316                                  const char *message, bool roaming)
2317 {
2318         struct batadv_tt_global_entry *tt_global_entry;
2319         struct batadv_tt_local_entry *local_entry = NULL;
2320 
2321         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
2322         if (!tt_global_entry)
2323                 goto out;
2324 
2325         if (!roaming) {
2326                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
2327                                                orig_node, message);
2328 
2329                 if (hlist_empty(&tt_global_entry->orig_list))
2330                         batadv_tt_global_free(bat_priv, tt_global_entry,
2331                                               message);
2332 
2333                 goto out;
2334         }
2335 
2336         /* if we are deleting a global entry due to a roam
2337          * event, there are two possibilities:
2338          * 1) the client roamed from node A to node B => if there
2339          *    is only one originator left for this client, we mark
2340          *    it with BATADV_TT_CLIENT_ROAM, we start a timer and we
2341          *    wait for node B to claim it. In case of timeout
2342          *    the entry is purged.
2343          *
2344          *    If there are other originators left, we directly delete
2345          *    the originator.
2346          * 2) the client roamed to us => we can directly delete
2347          *    the global entry, since it is useless now.
2348          */
2349         local_entry = batadv_tt_local_hash_find(bat_priv,
2350                                                 tt_global_entry->common.addr,
2351                                                 vid);
2352         if (local_entry) {
2353                 /* local entry exists, case 2: client roamed to us. */
2354                 batadv_tt_global_del_orig_list(tt_global_entry);
2355                 batadv_tt_global_free(bat_priv, tt_global_entry, message);
2356         } else {
2357                 /* no local entry exists, case 1: check for roaming */
2358                 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
2359                                              orig_node, message);
2360         }
2361 
2362 out:
2363         if (tt_global_entry)
2364                 batadv_tt_global_entry_put(tt_global_entry);
2365         if (local_entry)
2366                 batadv_tt_local_entry_put(local_entry);
2367 }
2368 
2369 /**
2370  * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
2371  *  given originator matching the provided vid
2372  * @bat_priv: the bat priv with all the soft interface information
2373  * @orig_node: the originator owning the entries to remove
2374  * @match_vid: the VLAN identifier to match. If negative all the entries will be
2375  *  removed
2376  * @message: debug message to print as "reason"
2377  */
2378 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
2379                                struct batadv_orig_node *orig_node,
2380                                s32 match_vid,
2381                                const char *message)
2382 {
2383         struct batadv_tt_global_entry *tt_global;
2384         struct batadv_tt_common_entry *tt_common_entry;
2385         u32 i;
2386         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2387         struct hlist_node *safe;
2388         struct hlist_head *head;
2389         spinlock_t *list_lock; /* protects write access to the hash lists */
2390         unsigned short vid;
2391 
2392         if (!hash)
2393                 return;
2394 
2395         for (i = 0; i < hash->size; i++) {
2396                 head = &hash->table[i];
2397                 list_lock = &hash->list_locks[i];
2398 
2399                 spin_lock_bh(list_lock);
2400                 hlist_for_each_entry_safe(tt_common_entry, safe,
2401                                           head, hash_entry) {
2402                         /* remove only matching entries */
2403                         if (match_vid >= 0 && tt_common_entry->vid != match_vid)
2404                                 continue;
2405 
2406                         tt_global = container_of(tt_common_entry,
2407                                                  struct batadv_tt_global_entry,
2408                                                  common);
2409 
2410                         batadv_tt_global_del_orig_node(bat_priv, tt_global,
2411                                                        orig_node, message);
2412 
2413                         if (hlist_empty(&tt_global->orig_list)) {
2414                                 vid = tt_global->common.vid;
2415                                 batadv_dbg(BATADV_DBG_TT, bat_priv,
2416                                            "Deleting global tt entry %pM (vid: %d): %s\n",
2417                                            tt_global->common.addr,
2418                                            batadv_print_vid(vid), message);
2419                                 hlist_del_rcu(&tt_common_entry->hash_entry);
2420                                 batadv_tt_global_entry_put(tt_global);
2421                         }
2422                 }
2423                 spin_unlock_bh(list_lock);
2424         }
2425         clear_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
2426 }
2427 
2428 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
2429                                       char **msg)
2430 {
2431         bool purge = false;
2432         unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
2433         unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
2434 
2435         if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
2436             batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
2437                 purge = true;
2438                 *msg = "Roaming timeout\n";
2439         }
2440 
2441         if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
2442             batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
2443                 purge = true;
2444                 *msg = "Temporary client timeout\n";
2445         }
2446 
2447         return purge;
2448 }
2449 
2450 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
2451 {
2452         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2453         struct hlist_head *head;
2454         struct hlist_node *node_tmp;
2455         spinlock_t *list_lock; /* protects write access to the hash lists */
2456         u32 i;
2457         char *msg = NULL;
2458         struct batadv_tt_common_entry *tt_common;
2459         struct batadv_tt_global_entry *tt_global;
2460 
2461         for (i = 0; i < hash->size; i++) {
2462                 head = &hash->table[i];
2463                 list_lock = &hash->list_locks[i];
2464 
2465                 spin_lock_bh(list_lock);
2466                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
2467                                           hash_entry) {
2468                         tt_global = container_of(tt_common,
2469                                                  struct batadv_tt_global_entry,
2470                                                  common);
2471 
2472                         if (!batadv_tt_global_to_purge(tt_global, &msg))
2473                                 continue;
2474 
2475                         batadv_dbg(BATADV_DBG_TT, bat_priv,
2476                                    "Deleting global tt entry %pM (vid: %d): %s\n",
2477                                    tt_global->common.addr,
2478                                    batadv_print_vid(tt_global->common.vid),
2479                                    msg);
2480 
2481                         hlist_del_rcu(&tt_common->hash_entry);
2482 
2483                         batadv_tt_global_entry_put(tt_global);
2484                 }
2485                 spin_unlock_bh(list_lock);
2486         }
2487 }
2488 
2489 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
2490 {
2491         struct batadv_hashtable *hash;
2492         spinlock_t *list_lock; /* protects write access to the hash lists */
2493         struct batadv_tt_common_entry *tt_common_entry;
2494         struct batadv_tt_global_entry *tt_global;
2495         struct hlist_node *node_tmp;
2496         struct hlist_head *head;
2497         u32 i;
2498 
2499         if (!bat_priv->tt.global_hash)
2500                 return;
2501 
2502         hash = bat_priv->tt.global_hash;
2503 
2504         for (i = 0; i < hash->size; i++) {
2505                 head = &hash->table[i];
2506                 list_lock = &hash->list_locks[i];
2507 
2508                 spin_lock_bh(list_lock);
2509                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
2510                                           head, hash_entry) {
2511                         hlist_del_rcu(&tt_common_entry->hash_entry);
2512                         tt_global = container_of(tt_common_entry,
2513                                                  struct batadv_tt_global_entry,
2514                                                  common);
2515                         batadv_tt_global_entry_put(tt_global);
2516                 }
2517                 spin_unlock_bh(list_lock);
2518         }
2519 
2520         batadv_hash_destroy(hash);
2521 
2522         bat_priv->tt.global_hash = NULL;
2523 }
2524 
2525 static bool
2526 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
2527                        struct batadv_tt_global_entry *tt_global_entry)
2528 {
2529         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
2530             tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
2531                 return true;
2532 
2533         /* check if the two clients are marked as isolated */
2534         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
2535             tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
2536                 return true;
2537 
2538         return false;
2539 }
2540 
2541 /**
2542  * batadv_transtable_search - get the mesh destination for a given client
2543  * @bat_priv: the bat priv with all the soft interface information
2544  * @src: mac address of the source client
2545  * @addr: mac address of the destination client
2546  * @vid: VLAN identifier
2547  *
2548  * Return: a pointer to the originator that was selected as destination in the
2549  * mesh for contacting the client 'addr', NULL otherwise.
2550  * In case of multiple originators serving the same client, the function returns
2551  * the best one (best in terms of metric towards the destination node).
2552  *
2553  * If the two clients are AP isolated the function returns NULL.
2554  */
2555 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
2556                                                   const u8 *src,
2557                                                   const u8 *addr,
2558                                                   unsigned short vid)
2559 {
2560         struct batadv_tt_local_entry *tt_local_entry = NULL;
2561         struct batadv_tt_global_entry *tt_global_entry = NULL;
2562         struct batadv_orig_node *orig_node = NULL;
2563         struct batadv_tt_orig_list_entry *best_entry;
2564 
2565         if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) {
2566                 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
2567                 if (!tt_local_entry ||
2568                     (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
2569                         goto out;
2570         }
2571 
2572         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
2573         if (!tt_global_entry)
2574                 goto out;
2575 
2576         /* check whether the clients should not communicate due to AP
2577          * isolation
2578          */
2579         if (tt_local_entry &&
2580             _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
2581                 goto out;
2582 
2583         rcu_read_lock();
2584         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
2585         /* found anything? */
2586         if (best_entry)
2587                 orig_node = best_entry->orig_node;
2588         if (orig_node && !kref_get_unless_zero(&orig_node->refcount))
2589                 orig_node = NULL;
2590         rcu_read_unlock();
2591 
2592 out:
2593         if (tt_global_entry)
2594                 batadv_tt_global_entry_put(tt_global_entry);
2595         if (tt_local_entry)
2596                 batadv_tt_local_entry_put(tt_local_entry);
2597 
2598         return orig_node;
2599 }
2600 
2601 /**
2602  * batadv_tt_global_crc - calculates the checksum of the local table belonging
2603  *  to the given orig_node
2604  * @bat_priv: the bat priv with all the soft interface information
2605  * @orig_node: originator for which the CRC should be computed
2606  * @vid: VLAN identifier for which the CRC32 has to be computed
2607  *
2608  * This function computes the checksum for the global table corresponding to a
2609  * specific originator. In particular, the checksum is computed as follows: For
2610  * each client connected to the originator the CRC32C of the MAC address and the
2611  * VID is computed and then all the CRC32Cs of the various clients are xor'ed
2612  * together.
2613  *
2614  * The idea behind is that CRC32C should be used as much as possible in order to
2615  * produce a unique hash of the table, but since the order which is used to feed
2616  * the CRC32C function affects the result and since every node in the network
2617  * probably sorts the clients differently, the hash function cannot be directly
2618  * computed over the entire table. Hence the CRC32C is used only on
2619  * the single client entry, while all the results are then xor'ed together
2620  * because the XOR operation can combine them all while trying to reduce the
2621  * noise as much as possible.
2622  *
2623  * Return: the checksum of the global table of a given originator.
2624  */
2625 static u32 batadv_tt_global_crc(struct batadv_priv *bat_priv,
2626                                 struct batadv_orig_node *orig_node,
2627                                 unsigned short vid)
2628 {
2629         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2630         struct batadv_tt_orig_list_entry *tt_orig;
2631         struct batadv_tt_common_entry *tt_common;
2632         struct batadv_tt_global_entry *tt_global;
2633         struct hlist_head *head;
2634         u32 i, crc_tmp, crc = 0;
2635         u8 flags;
2636         __be16 tmp_vid;
2637 
2638         for (i = 0; i < hash->size; i++) {
2639                 head = &hash->table[i];
2640 
2641                 rcu_read_lock();
2642                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2643                         tt_global = container_of(tt_common,
2644                                                  struct batadv_tt_global_entry,
2645                                                  common);
2646                         /* compute the CRC only for entries belonging to the
2647                          * VLAN identified by the vid passed as parameter
2648                          */
2649                         if (tt_common->vid != vid)
2650                                 continue;
2651 
2652                         /* Roaming clients are in the global table for
2653                          * consistency only. They don't have to be
2654                          * taken into account while computing the
2655                          * global crc
2656                          */
2657                         if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
2658                                 continue;
2659                         /* Temporary clients have not been announced yet, so
2660                          * they have to be skipped while computing the global
2661                          * crc
2662                          */
2663                         if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
2664                                 continue;
2665 
2666                         /* find out if this global entry is announced by this
2667                          * originator
2668                          */
2669                         tt_orig = batadv_tt_global_orig_entry_find(tt_global,
2670                                                                    orig_node);
2671                         if (!tt_orig)
2672                                 continue;
2673 
2674                         /* use network order to read the VID: this ensures that
2675                          * every node reads the bytes in the same order.
2676                          */
2677                         tmp_vid = htons(tt_common->vid);
2678                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2679 
2680                         /* compute the CRC on flags that have to be kept in sync
2681                          * among nodes
2682                          */
2683                         flags = tt_orig->flags;
2684                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2685 
2686                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2687 
2688                         batadv_tt_orig_list_entry_put(tt_orig);
2689                 }
2690                 rcu_read_unlock();
2691         }
2692 
2693         return crc;
2694 }
2695 
2696 /**
2697  * batadv_tt_local_crc - calculates the checksum of the local table
2698  * @bat_priv: the bat priv with all the soft interface information
2699  * @vid: VLAN identifier for which the CRC32 has to be computed
2700  *
2701  * For details about the computation, please refer to the documentation for
2702  * batadv_tt_global_crc().
2703  *
2704  * Return: the checksum of the local table
2705  */
2706 static u32 batadv_tt_local_crc(struct batadv_priv *bat_priv,
2707                                unsigned short vid)
2708 {
2709         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2710         struct batadv_tt_common_entry *tt_common;
2711         struct hlist_head *head;
2712         u32 i, crc_tmp, crc = 0;
2713         u8 flags;
2714         __be16 tmp_vid;
2715 
2716         for (i = 0; i < hash->size; i++) {
2717                 head = &hash->table[i];
2718 
2719                 rcu_read_lock();
2720                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2721                         /* compute the CRC only for entries belonging to the
2722                          * VLAN identified by vid
2723                          */
2724                         if (tt_common->vid != vid)
2725                                 continue;
2726 
2727                         /* not yet committed clients have not to be taken into
2728                          * account while computing the CRC
2729                          */
2730                         if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2731                                 continue;
2732 
2733                         /* use network order to read the VID: this ensures that
2734                          * every node reads the bytes in the same order.
2735                          */
2736                         tmp_vid = htons(tt_common->vid);
2737                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2738 
2739                         /* compute the CRC on flags that have to be kept in sync
2740                          * among nodes
2741                          */
2742                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2743                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2744 
2745                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2746                 }
2747                 rcu_read_unlock();
2748         }
2749 
2750         return crc;
2751 }
2752 
2753 /**
2754  * batadv_tt_req_node_release - free tt_req node entry
2755  * @ref: kref pointer of the tt req_node entry
2756  */
2757 static void batadv_tt_req_node_release(struct kref *ref)
2758 {
2759         struct batadv_tt_req_node *tt_req_node;
2760 
2761         tt_req_node = container_of(ref, struct batadv_tt_req_node, refcount);
2762 
2763         kmem_cache_free(batadv_tt_req_cache, tt_req_node);
2764 }
2765 
2766 /**
2767  * batadv_tt_req_node_put - decrement the tt_req_node refcounter and
2768  *  possibly release it
2769  * @tt_req_node: tt_req_node to be free'd
2770  */
2771 static void batadv_tt_req_node_put(struct batadv_tt_req_node *tt_req_node)
2772 {
2773         kref_put(&tt_req_node->refcount, batadv_tt_req_node_release);
2774 }
2775 
2776 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2777 {
2778         struct batadv_tt_req_node *node;
2779         struct hlist_node *safe;
2780 
2781         spin_lock_bh(&bat_priv->tt.req_list_lock);
2782 
2783         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2784                 hlist_del_init(&node->list);
2785                 batadv_tt_req_node_put(node);
2786         }
2787 
2788         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2789 }
2790 
2791 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2792                                        struct batadv_orig_node *orig_node,
2793                                        const void *tt_buff,
2794                                        u16 tt_buff_len)
2795 {
2796         /* Replace the old buffer only if I received something in the
2797          * last OGM (the OGM could carry no changes)
2798          */
2799         spin_lock_bh(&orig_node->tt_buff_lock);
2800         if (tt_buff_len > 0) {
2801                 kfree(orig_node->tt_buff);
2802                 orig_node->tt_buff_len = 0;
2803                 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2804                 if (orig_node->tt_buff) {
2805                         memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2806                         orig_node->tt_buff_len = tt_buff_len;
2807                 }
2808         }
2809         spin_unlock_bh(&orig_node->tt_buff_lock);
2810 }
2811 
2812 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2813 {
2814         struct batadv_tt_req_node *node;
2815         struct hlist_node *safe;
2816 
2817         spin_lock_bh(&bat_priv->tt.req_list_lock);
2818         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2819                 if (batadv_has_timed_out(node->issued_at,
2820                                          BATADV_TT_REQUEST_TIMEOUT)) {
2821                         hlist_del_init(&node->list);
2822                         batadv_tt_req_node_put(node);
2823                 }
2824         }
2825         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2826 }
2827 
2828 /**
2829  * batadv_tt_req_node_new - search and possibly create a tt_req_node object
2830  * @bat_priv: the bat priv with all the soft interface information
2831  * @orig_node: orig node this request is being issued for
2832  *
2833  * Return: the pointer to the new tt_req_node struct if no request
2834  * has already been issued for this orig_node, NULL otherwise.
2835  */
2836 static struct batadv_tt_req_node *
2837 batadv_tt_req_node_new(struct batadv_priv *bat_priv,
2838                        struct batadv_orig_node *orig_node)
2839 {
2840         struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2841 
2842         spin_lock_bh(&bat_priv->tt.req_list_lock);
2843         hlist_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2844                 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2845                     !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2846                                           BATADV_TT_REQUEST_TIMEOUT))
2847                         goto unlock;
2848         }
2849 
2850         tt_req_node = kmem_cache_alloc(batadv_tt_req_cache, GFP_ATOMIC);
2851         if (!tt_req_node)
2852                 goto unlock;
2853 
2854         kref_init(&tt_req_node->refcount);
2855         ether_addr_copy(tt_req_node->addr, orig_node->orig);
2856         tt_req_node->issued_at = jiffies;
2857 
2858         kref_get(&tt_req_node->refcount);
2859         hlist_add_head(&tt_req_node->list, &bat_priv->tt.req_list);
2860 unlock:
2861         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2862         return tt_req_node;
2863 }
2864 
2865 /**
2866  * batadv_tt_local_valid - verify that given tt entry is a valid one
2867  * @entry_ptr: to be checked local tt entry
2868  * @data_ptr: not used but definition required to satisfy the callback prototype
2869  *
2870  * Return: true if the entry is a valid, false otherwise.
2871  */
2872 static bool batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
2873 {
2874         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2875 
2876         if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2877                 return false;
2878         return true;
2879 }
2880 
2881 static bool batadv_tt_global_valid(const void *entry_ptr,
2882                                    const void *data_ptr)
2883 {
2884         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2885         const struct batadv_tt_global_entry *tt_global_entry;
2886         const struct batadv_orig_node *orig_node = data_ptr;
2887 
2888         if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2889             tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2890                 return false;
2891 
2892         tt_global_entry = container_of(tt_common_entry,
2893                                        struct batadv_tt_global_entry,
2894                                        common);
2895 
2896         return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
2897 }
2898 
2899 /**
2900  * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2901  *  specified tt hash
2902  * @bat_priv: the bat priv with all the soft interface information
2903  * @hash: hash table containing the tt entries
2904  * @tt_len: expected tvlv tt data buffer length in number of bytes
2905  * @tvlv_buff: pointer to the buffer to fill with the TT data
2906  * @valid_cb: function to filter tt change entries
2907  * @cb_data: data passed to the filter function as argument
2908  */
2909 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2910                                     struct batadv_hashtable *hash,
2911                                     void *tvlv_buff, u16 tt_len,
2912                                     bool (*valid_cb)(const void *,
2913                                                      const void *),
2914                                     void *cb_data)
2915 {
2916         struct batadv_tt_common_entry *tt_common_entry;
2917         struct batadv_tvlv_tt_change *tt_change;
2918         struct hlist_head *head;
2919         u16 tt_tot, tt_num_entries = 0;
2920         u32 i;
2921 
2922         tt_tot = batadv_tt_entries(tt_len);
2923         tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
2924 
2925         rcu_read_lock();
2926         for (i = 0; i < hash->size; i++) {
2927                 head = &hash->table[i];
2928 
2929                 hlist_for_each_entry_rcu(tt_common_entry,
2930                                          head, hash_entry) {
2931                         if (tt_tot == tt_num_entries)
2932                                 break;
2933 
2934                         if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
2935                                 continue;
2936 
2937                         ether_addr_copy(tt_change->addr, tt_common_entry->addr);
2938                         tt_change->flags = tt_common_entry->flags;
2939                         tt_change->vid = htons(tt_common_entry->vid);
2940                         memset(tt_change->reserved, 0,
2941                                sizeof(tt_change->reserved));
2942 
2943                         tt_num_entries++;
2944                         tt_change++;
2945                 }
2946         }
2947         rcu_read_unlock();
2948 }
2949 
2950 /**
2951  * batadv_tt_global_check_crc - check if all the CRCs are correct
2952  * @orig_node: originator for which the CRCs have to be checked
2953  * @tt_vlan: pointer to the first tvlv VLAN entry
2954  * @num_vlan: number of tvlv VLAN entries
2955  *
2956  * Return: true if all the received CRCs match the locally stored ones, false
2957  * otherwise
2958  */
2959 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
2960                                        struct batadv_tvlv_tt_vlan_data *tt_vlan,
2961                                        u16 num_vlan)
2962 {
2963         struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
2964         struct batadv_orig_node_vlan *vlan;
2965         int i, orig_num_vlan;
2966         u32 crc;
2967 
2968         /* check if each received CRC matches the locally stored one */
2969         for (i = 0; i < num_vlan; i++) {
2970                 tt_vlan_tmp = tt_vlan + i;
2971 
2972                 /* if orig_node is a backbone node for this VLAN, don't check
2973                  * the CRC as we ignore all the global entries over it
2974                  */
2975                 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
2976                                                    orig_node->orig,
2977                                                    ntohs(tt_vlan_tmp->vid)))
2978                         continue;
2979 
2980                 vlan = batadv_orig_node_vlan_get(orig_node,
2981                                                  ntohs(tt_vlan_tmp->vid));
2982                 if (!vlan)
2983                         return false;
2984 
2985                 crc = vlan->tt.crc;
2986                 batadv_orig_node_vlan_put(vlan);
2987 
2988                 if (crc != ntohl(tt_vlan_tmp->crc))
2989                         return false;
2990         }
2991 
2992         /* check if any excess VLANs exist locally for the originator
2993          * which are not mentioned in the TVLV from the originator.
2994          */
2995         rcu_read_lock();
2996         orig_num_vlan = 0;
2997         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list)
2998                 orig_num_vlan++;
2999         rcu_read_unlock();
3000 
3001         if (orig_num_vlan > num_vlan)
3002                 return false;
3003 
3004         return true;
3005 }
3006 
3007 /**
3008  * batadv_tt_local_update_crc - update all the local CRCs
3009  * @bat_priv: the bat priv with all the soft interface information
3010  */
3011 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
3012 {
3013         struct batadv_softif_vlan *vlan;
3014 
3015         /* recompute the global CRC for each VLAN */
3016         rcu_read_lock();
3017         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
3018                 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
3019         }
3020         rcu_read_unlock();
3021 }
3022 
3023 /**
3024  * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
3025  * @bat_priv: the bat priv with all the soft interface information
3026  * @orig_node: the orig_node for which the CRCs have to be updated
3027  */
3028 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
3029                                         struct batadv_orig_node *orig_node)
3030 {
3031         struct batadv_orig_node_vlan *vlan;
3032         u32 crc;
3033 
3034         /* recompute the global CRC for each VLAN */
3035         rcu_read_lock();
3036         hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
3037                 /* if orig_node is a backbone node for this VLAN, don't compute
3038                  * the CRC as we ignore all the global entries over it
3039                  */
3040                 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
3041                                                    vlan->vid))
3042                         continue;
3043 
3044                 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
3045                 vlan->tt.crc = crc;
3046         }
3047         rcu_read_unlock();
3048 }
3049 
3050 /**
3051  * batadv_send_tt_request - send a TT Request message to a given node
3052  * @bat_priv: the bat priv with all the soft interface information
3053  * @dst_orig_node: the destination of the message
3054  * @ttvn: the version number that the source of the message is looking for
3055  * @tt_vlan: pointer to the first tvlv VLAN object to request
3056  * @num_vlan: number of tvlv VLAN entries
3057  * @full_table: ask for the entire translation table if true, while only for the
3058  *  last TT diff otherwise
3059  *
3060  * Return: true if the TT Request was sent, false otherwise
3061  */
3062 static bool batadv_send_tt_request(struct batadv_priv *bat_priv,
3063                                    struct batadv_orig_node *dst_orig_node,
3064                                    u8 ttvn,
3065                                    struct batadv_tvlv_tt_vlan_data *tt_vlan,
3066                                    u16 num_vlan, bool full_table)
3067 {
3068         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
3069         struct batadv_tt_req_node *tt_req_node = NULL;
3070         struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
3071         struct batadv_hard_iface *primary_if;
3072         bool ret = false;
3073         int i, size;
3074 
3075         primary_if = batadv_primary_if_get_selected(bat_priv);
3076         if (!primary_if)
3077                 goto out;
3078 
3079         /* The new tt_req will be issued only if I'm not waiting for a
3080          * reply from the same orig_node yet
3081          */
3082         tt_req_node = batadv_tt_req_node_new(bat_priv, dst_orig_node);
3083         if (!tt_req_node)
3084                 goto out;
3085 
3086         size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
3087         tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
3088         if (!tvlv_tt_data)
3089                 goto out;
3090 
3091         tvlv_tt_data->flags = BATADV_TT_REQUEST;
3092         tvlv_tt_data->ttvn = ttvn;
3093         tvlv_tt_data->num_vlan = htons(num_vlan);
3094 
3095         /* send all the CRCs within the request. This is needed by intermediate
3096          * nodes to ensure they have the correct table before replying
3097          */
3098         tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
3099         for (i = 0; i < num_vlan; i++) {
3100                 tt_vlan_req->vid = tt_vlan->vid;
3101                 tt_vlan_req->crc = tt_vlan->crc;
3102 
3103                 tt_vlan_req++;
3104                 tt_vlan++;
3105         }
3106 
3107         if (full_table)
3108                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
3109 
3110         batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
3111                    dst_orig_node->orig, full_table ? 'F' : '.');
3112 
3113         batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
3114         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3115                                  dst_orig_node->orig, BATADV_TVLV_TT, 1,
3116                                  tvlv_tt_data, size);
3117         ret = true;
3118 
3119 out:
3120         if (primary_if)
3121                 batadv_hardif_put(primary_if);
3122 
3123         if (ret && tt_req_node) {
3124                 spin_lock_bh(&bat_priv->tt.req_list_lock);
3125                 if (!hlist_unhashed(&tt_req_node->list)) {
3126                         hlist_del_init(&tt_req_node->list);
3127                         batadv_tt_req_node_put(tt_req_node);
3128                 }
3129                 spin_unlock_bh(&bat_priv->tt.req_list_lock);
3130         }
3131 
3132         if (tt_req_node)
3133                 batadv_tt_req_node_put(tt_req_node);
3134 
3135         kfree(tvlv_tt_data);
3136         return ret;
3137 }
3138 
3139 /**
3140  * batadv_send_other_tt_response - send reply to tt request concerning another
3141  *  node's translation table
3142  * @bat_priv: the bat priv with all the soft interface information
3143  * @tt_data: tt data containing the tt request information
3144  * @req_src: mac address of tt request sender
3145  * @req_dst: mac address of tt request recipient
3146  *
3147  * Return: true if tt request reply was sent, false otherwise.
3148  */
3149 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
3150                                           struct batadv_tvlv_tt_data *tt_data,
3151                                           u8 *req_src, u8 *req_dst)
3152 {
3153         struct batadv_orig_node *req_dst_orig_node;
3154         struct batadv_orig_node *res_dst_orig_node = NULL;
3155         struct batadv_tvlv_tt_change *tt_change;
3156         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
3157         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3158         bool ret = false, full_table;
3159         u8 orig_ttvn, req_ttvn;
3160         u16 tvlv_len;
3161         s32 tt_len;
3162 
3163         batadv_dbg(BATADV_DBG_TT, bat_priv,
3164                    "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
3165                    req_src, tt_data->ttvn, req_dst,
3166                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3167 
3168         /* Let's get the orig node of the REAL destination */
3169         req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
3170         if (!req_dst_orig_node)
3171                 goto out;
3172 
3173         res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
3174         if (!res_dst_orig_node)
3175                 goto out;
3176 
3177         orig_ttvn = (u8)atomic_read(&req_dst_orig_node->last_ttvn);
3178         req_ttvn = tt_data->ttvn;
3179 
3180         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3181         /* this node doesn't have the requested data */
3182         if (orig_ttvn != req_ttvn ||
3183             !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
3184                                         ntohs(tt_data->num_vlan)))
3185                 goto out;
3186 
3187         /* If the full table has been explicitly requested */
3188         if (tt_data->flags & BATADV_TT_FULL_TABLE ||
3189             !req_dst_orig_node->tt_buff)
3190                 full_table = true;
3191         else
3192                 full_table = false;
3193 
3194         /* TT fragmentation hasn't been implemented yet, so send as many
3195          * TT entries fit a single packet as possible only
3196          */
3197         if (!full_table) {
3198                 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
3199                 tt_len = req_dst_orig_node->tt_buff_len;
3200 
3201                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
3202                                                               &tvlv_tt_data,
3203                                                               &tt_change,
3204                                                               &tt_len);
3205                 if (!tt_len)
3206                         goto unlock;
3207 
3208                 /* Copy the last orig_node's OGM buffer */
3209                 memcpy(tt_change, req_dst_orig_node->tt_buff,
3210                        req_dst_orig_node->tt_buff_len);
3211                 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
3212         } else {
3213                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
3214                  * in the initial part
3215                  */
3216                 tt_len = -1;
3217                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
3218                                                               &tvlv_tt_data,
3219                                                               &tt_change,
3220                                                               &tt_len);
3221                 if (!tt_len)
3222                         goto out;
3223 
3224                 /* fill the rest of the tvlv with the real TT entries */
3225                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
3226                                         tt_change, tt_len,
3227                                         batadv_tt_global_valid,
3228                                         req_dst_orig_node);
3229         }
3230 
3231         /* Don't send the response, if larger than fragmented packet. */
3232         tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
3233         if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
3234                 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
3235                                          "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
3236                                          res_dst_orig_node->orig);
3237                 goto out;
3238         }
3239 
3240         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
3241         tvlv_tt_data->ttvn = req_ttvn;
3242 
3243         if (full_table)
3244                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
3245 
3246         batadv_dbg(BATADV_DBG_TT, bat_priv,
3247                    "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
3248                    res_dst_orig_node->orig, req_dst_orig_node->orig,
3249                    full_table ? 'F' : '.', req_ttvn);
3250 
3251         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
3252 
3253         batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
3254                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
3255                                  tvlv_len);
3256 
3257         ret = true;
3258         goto out;
3259 
3260 unlock:
3261         spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
3262 
3263 out:
3264         if (res_dst_orig_node)
3265                 batadv_orig_node_put(res_dst_orig_node);
3266         if (req_dst_orig_node)
3267                 batadv_orig_node_put(req_dst_orig_node);
3268         kfree(tvlv_tt_data);
3269         return ret;
3270 }
3271 
3272 /**
3273  * batadv_send_my_tt_response - send reply to tt request concerning this node's
3274  *  translation table
3275  * @bat_priv: the bat priv with all the soft interface information
3276  * @tt_data: tt data containing the tt request information
3277  * @req_src: mac address of tt request sender
3278  *
3279  * Return: true if tt request reply was sent, false otherwise.
3280  */
3281 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
3282                                        struct batadv_tvlv_tt_data *tt_data,
3283                                        u8 *req_src)
3284 {
3285         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
3286         struct batadv_hard_iface *primary_if = NULL;
3287         struct batadv_tvlv_tt_change *tt_change;
3288         struct batadv_orig_node *orig_node;
3289         u8 my_ttvn, req_ttvn;
3290         u16 tvlv_len;
3291         bool full_table;
3292         s32 tt_len;
3293 
3294         batadv_dbg(BATADV_DBG_TT, bat_priv,
3295                    "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
3296                    req_src, tt_data->ttvn,
3297                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3298 
3299         spin_lock_bh(&bat_priv->tt.commit_lock);
3300 
3301         my_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
3302         req_ttvn = tt_data->ttvn;
3303 
3304         orig_node = batadv_orig_hash_find(bat_priv, req_src);
3305         if (!orig_node)
3306                 goto out;
3307 
3308         primary_if = batadv_primary_if_get_selected(bat_priv);
3309         if (!primary_if)
3310                 goto out;
3311 
3312         /* If the full table has been explicitly requested or the gap
3313          * is too big send the whole local translation table
3314          */
3315         if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
3316             !bat_priv->tt.last_changeset)
3317                 full_table = true;
3318         else
3319                 full_table = false;
3320 
3321         /* TT fragmentation hasn't been implemented yet, so send as many
3322          * TT entries fit a single packet as possible only
3323          */
3324         if (!full_table) {
3325                 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
3326 
3327                 tt_len = bat_priv->tt.last_changeset_len;
3328                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
3329                                                              &tvlv_tt_data,
3330                                                              &tt_change,
3331                                                              &tt_len);
3332                 if (!tt_len || !tvlv_len)
3333                         goto unlock;
3334 
3335                 /* Copy the last orig_node's OGM buffer */
3336                 memcpy(tt_change, bat_priv->tt.last_changeset,
3337                        bat_priv->tt.last_changeset_len);
3338                 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
3339         } else {
3340                 req_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
3341 
3342                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
3343                  * in the initial part
3344                  */
3345                 tt_len = -1;
3346                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
3347                                                              &tvlv_tt_data,
3348                                                              &tt_change,
3349                                                              &tt_len);
3350                 if (!tt_len || !tvlv_len)
3351                         goto out;
3352 
3353                 /* fill the rest of the tvlv with the real TT entries */
3354                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
3355                                         tt_change, tt_len,
3356                                         batadv_tt_local_valid, NULL);
3357         }
3358 
3359         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
3360         tvlv_tt_data->ttvn = req_ttvn;
3361 
3362         if (full_table)
3363                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
3364 
3365         batadv_dbg(BATADV_DBG_TT, bat_priv,
3366                    "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
3367                    orig_node->orig, full_table ? 'F' : '.', req_ttvn);
3368 
3369         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
3370 
3371         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3372                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
3373                                  tvlv_len);
3374 
3375         goto out;
3376 
3377 unlock:
3378         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
3379 out:
3380         spin_unlock_bh(&bat_priv->tt.commit_lock);
3381         if (orig_node)
3382                 batadv_orig_node_put(orig_node);
3383         if (primary_if)
3384                 batadv_hardif_put(primary_if);
3385         kfree(tvlv_tt_data);
3386         /* The packet was for this host, so it doesn't need to be re-routed */
3387         return true;
3388 }
3389 
3390 /**
3391  * batadv_send_tt_response - send reply to tt request
3392  * @bat_priv: the bat priv with all the soft interface information
3393  * @tt_data: tt data containing the tt request information
3394  * @req_src: mac address of tt request sender
3395  * @req_dst: mac address of tt request recipient
3396  *
3397  * Return: true if tt request reply was sent, false otherwise.
3398  */
3399 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
3400                                     struct batadv_tvlv_tt_data *tt_data,
3401                                     u8 *req_src, u8 *req_dst)
3402 {
3403         if (batadv_is_my_mac(bat_priv, req_dst))
3404                 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
3405         return batadv_send_other_tt_response(bat_priv, tt_data, req_src,
3406                                              req_dst);
3407 }
3408 
3409 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
3410                                       struct batadv_orig_node *orig_node,
3411                                       struct batadv_tvlv_tt_change *tt_change,
3412                                       u16 tt_num_changes, u8 ttvn)
3413 {
3414         int i;
3415         int roams;
3416 
3417         for (i = 0; i < tt_num_changes; i++) {
3418                 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
3419                         roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
3420                         batadv_tt_global_del(bat_priv, orig_node,
3421                                              (tt_change + i)->addr,
3422                                              ntohs((tt_change + i)->vid),
3423                                              "tt removed by changes",
3424                                              roams);
3425                 } else {
3426                         if (!batadv_tt_global_add(bat_priv, orig_node,
3427                                                   (tt_change + i)->addr,
3428                                                   ntohs((tt_change + i)->vid),
3429                                                   (tt_change + i)->flags, ttvn))
3430                                 /* In case of problem while storing a
3431                                  * global_entry, we stop the updating
3432                                  * procedure without committing the
3433                                  * ttvn change. This will avoid to send
3434                                  * corrupted data on tt_request
3435                                  */
3436                                 return;
3437                 }
3438         }
3439         set_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
3440 }
3441 
3442 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
3443                                   struct batadv_tvlv_tt_change *tt_change,
3444                                   u8 ttvn, u8 *resp_src,
3445                                   u16 num_entries)
3446 {
3447         struct batadv_orig_node *orig_node;
3448 
3449         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
3450         if (!orig_node)
3451                 goto out;
3452 
3453         /* Purge the old table first.. */
3454         batadv_tt_global_del_orig(bat_priv, orig_node, -1,
3455                                   "Received full table");
3456 
3457         _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
3458                                   ttvn);
3459 
3460         spin_lock_bh(&orig_node->tt_buff_lock);
3461         kfree(orig_node->tt_buff);
3462         orig_node->tt_buff_len = 0;
3463         orig_node->tt_buff = NULL;
3464         spin_unlock_bh(&orig_node->tt_buff_lock);
3465 
3466         atomic_set(&orig_node->last_ttvn, ttvn);
3467 
3468 out:
3469         if (orig_node)
3470                 batadv_orig_node_put(orig_node);
3471 }
3472 
3473 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
3474                                      struct batadv_orig_node *orig_node,
3475                                      u16 tt_num_changes, u8 ttvn,
3476                                      struct batadv_tvlv_tt_change *tt_change)
3477 {
3478         _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
3479                                   tt_num_changes, ttvn);
3480 
3481         batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
3482                                    batadv_tt_len(tt_num_changes));
3483         atomic_set(&orig_node->last_ttvn, ttvn);
3484 }
3485 
3486 /**
3487  * batadv_is_my_client - check if a client is served by the local node
3488  * @bat_priv: the bat priv with all the soft interface information
3489  * @addr: the mac address of the client to check
3490  * @vid: VLAN identifier
3491  *
3492  * Return: true if the client is served by this node, false otherwise.
3493  */
3494 bool batadv_is_my_client(struct batadv_priv *bat_priv, const u8 *addr,
3495                          unsigned short vid)
3496 {
3497         struct batadv_tt_local_entry *tt_local_entry;
3498         bool ret = false;
3499 
3500         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3501         if (!tt_local_entry)
3502                 goto out;
3503         /* Check if the client has been logically deleted (but is kept for
3504          * consistency purpose)
3505          */
3506         if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
3507             (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
3508                 goto out;
3509         ret = true;
3510 out:
3511         if (tt_local_entry)
3512                 batadv_tt_local_entry_put(tt_local_entry);
3513         return ret;
3514 }
3515 
3516 /**
3517  * batadv_handle_tt_response - process incoming tt reply
3518  * @bat_priv: the bat priv with all the soft interface information
3519  * @tt_data: tt data containing the tt request information
3520  * @resp_src: mac address of tt reply sender
3521  * @num_entries: number of tt change entries appended to the tt data
3522  */
3523 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
3524                                       struct batadv_tvlv_tt_data *tt_data,
3525                                       u8 *resp_src, u16 num_entries)
3526 {
3527         struct batadv_tt_req_node *node;
3528         struct hlist_node *safe;
3529         struct batadv_orig_node *orig_node = NULL;
3530         struct batadv_tvlv_tt_change *tt_change;
3531         u8 *tvlv_ptr = (u8 *)tt_data;
3532         u16 change_offset;
3533 
3534         batadv_dbg(BATADV_DBG_TT, bat_priv,
3535                    "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
3536                    resp_src, tt_data->ttvn, num_entries,
3537                    ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
3538 
3539         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
3540         if (!orig_node)
3541                 goto out;
3542 
3543         spin_lock_bh(&orig_node->tt_lock);
3544 
3545         change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
3546         change_offset *= ntohs(tt_data->num_vlan);
3547         change_offset += sizeof(*tt_data);
3548         tvlv_ptr += change_offset;
3549 
3550         tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
3551         if (tt_data->flags & BATADV_TT_FULL_TABLE) {
3552                 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
3553                                       resp_src, num_entries);
3554         } else {
3555                 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
3556                                          tt_data->ttvn, tt_change);
3557         }
3558 
3559         /* Recalculate the CRC for this orig_node and store it */
3560         batadv_tt_global_update_crc(bat_priv, orig_node);
3561 
3562         spin_unlock_bh(&orig_node->tt_lock);
3563 
3564         /* Delete the tt_req_node from pending tt_requests list */
3565         spin_lock_bh(&bat_priv->tt.req_list_lock);
3566         hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
3567                 if (!batadv_compare_eth(node->addr, resp_src))
3568                         continue;
3569                 hlist_del_init(&node->list);
3570                 batadv_tt_req_node_put(node);
3571         }
3572 
3573         spin_unlock_bh(&bat_priv->tt.req_list_lock);
3574 out:
3575         if (orig_node)
3576                 batadv_orig_node_put(orig_node);
3577 }
3578 
3579 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
3580 {
3581         struct batadv_tt_roam_node *node, *safe;
3582 
3583         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3584 
3585         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3586                 list_del(&node->list);
3587                 kmem_cache_free(batadv_tt_roam_cache, node);
3588         }
3589 
3590         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3591 }
3592 
3593 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
3594 {
3595         struct batadv_tt_roam_node *node, *safe;
3596 
3597         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3598         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3599                 if (!batadv_has_timed_out(node->first_time,
3600                                           BATADV_ROAMING_MAX_TIME))
3601                         continue;
3602 
3603                 list_del(&node->list);
3604                 kmem_cache_free(batadv_tt_roam_cache, node);
3605         }
3606         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3607 }
3608 
3609 /**
3610  * batadv_tt_check_roam_count - check if a client has roamed too frequently
3611  * @bat_priv: the bat priv with all the soft interface information
3612  * @client: mac address of the roaming client
3613  *
3614  * This function checks whether the client already reached the
3615  * maximum number of possible roaming phases. In this case the ROAMING_ADV
3616  * will not be sent.
3617  *
3618  * Return: true if the ROAMING_ADV can be sent, false otherwise
3619  */
3620 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, u8 *client)
3621 {
3622         struct batadv_tt_roam_node *tt_roam_node;
3623         bool ret = false;
3624 
3625         spin_lock_bh(&bat_priv->tt.roam_list_lock);
3626         /* The new tt_req will be issued only if I'm not waiting for a
3627          * reply from the same orig_node yet
3628          */
3629         list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
3630                 if (!batadv_compare_eth(tt_roam_node->addr, client))
3631                         continue;
3632 
3633                 if (batadv_has_timed_out(tt_roam_node->first_time,
3634                                          BATADV_ROAMING_MAX_TIME))
3635                         continue;
3636 
3637                 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
3638                         /* Sorry, you roamed too many times! */
3639                         goto unlock;
3640                 ret = true;
3641                 break;
3642         }
3643 
3644         if (!ret) {
3645                 tt_roam_node = kmem_cache_alloc(batadv_tt_roam_cache,
3646                                                 GFP_ATOMIC);
3647                 if (!tt_roam_node)
3648                         goto unlock;
3649 
3650                 tt_roam_node->first_time = jiffies;
3651                 atomic_set(&tt_roam_node->counter,
3652                            BATADV_ROAMING_MAX_COUNT - 1);
3653                 ether_addr_copy(tt_roam_node->addr, client);
3654 
3655                 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
3656                 ret = true;
3657         }
3658 
3659 unlock:
3660         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3661         return ret;
3662 }
3663 
3664 /**
3665  * batadv_send_roam_adv - send a roaming advertisement message
3666  * @bat_priv: the bat priv with all the soft interface information
3667  * @client: mac address of the roaming client
3668  * @vid: VLAN identifier
3669  * @orig_node: message destination
3670  *
3671  * Send a ROAMING_ADV message to the node which was previously serving this
3672  * client. This is done to inform the node that from now on all traffic destined
3673  * for this particular roamed client has to be forwarded to the sender of the
3674  * roaming message.
3675  */
3676 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
3677                                  unsigned short vid,
3678                                  struct batadv_orig_node *orig_node)
3679 {
3680         struct batadv_hard_iface *primary_if;
3681         struct batadv_tvlv_roam_adv tvlv_roam;
3682 
3683         primary_if = batadv_primary_if_get_selected(bat_priv);
3684         if (!primary_if)
3685                 goto out;
3686 
3687         /* before going on we have to check whether the client has
3688          * already roamed to us too many times
3689          */
3690         if (!batadv_tt_check_roam_count(bat_priv, client))
3691                 goto out;
3692 
3693         batadv_dbg(BATADV_DBG_TT, bat_priv,
3694                    "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
3695                    orig_node->orig, client, batadv_print_vid(vid));
3696 
3697         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
3698 
3699         memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
3700         tvlv_roam.vid = htons(vid);
3701 
3702         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3703                                  orig_node->orig, BATADV_TVLV_ROAM, 1,
3704                                  &tvlv_roam, sizeof(tvlv_roam));
3705 
3706 out:
3707         if (primary_if)
3708                 batadv_hardif_put(primary_if);
3709 }
3710 
3711 static void batadv_tt_purge(struct work_struct *work)
3712 {
3713         struct delayed_work *delayed_work;
3714         struct batadv_priv_tt *priv_tt;
3715         struct batadv_priv *bat_priv;
3716 
3717         delayed_work = to_delayed_work(work);
3718         priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
3719         bat_priv = container_of(priv_tt, struct batadv_priv, tt);
3720 
3721         batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
3722         batadv_tt_global_purge(bat_priv);
3723         batadv_tt_req_purge(bat_priv);
3724         batadv_tt_roam_purge(bat_priv);
3725 
3726         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3727                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3728 }
3729 
3730 void batadv_tt_free(struct batadv_priv *bat_priv)
3731 {
3732         batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
3733         batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
3734 
3735         cancel_delayed_work_sync(&bat_priv->tt.work);
3736 
3737         batadv_tt_local_table_free(bat_priv);
3738         batadv_tt_global_table_free(bat_priv);
3739         batadv_tt_req_list_free(bat_priv);
3740         batadv_tt_changes_list_free(bat_priv);
3741         batadv_tt_roam_list_free(bat_priv);
3742 
3743         kfree(bat_priv->tt.last_changeset);
3744 }
3745 
3746 /**
3747  * batadv_tt_local_set_flags - set or unset the specified flags on the local
3748  *  table and possibly count them in the TT size
3749  * @bat_priv: the bat priv with all the soft interface information
3750  * @flags: the flag to switch
3751  * @enable: whether to set or unset the flag
3752  * @count: whether to increase the TT size by the number of changed entries
3753  */
3754 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv, u16 flags,
3755                                       bool enable, bool count)
3756 {
3757         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3758         struct batadv_tt_common_entry *tt_common_entry;
3759         struct hlist_head *head;
3760         u32 i;
3761 
3762         if (!hash)
3763                 return;
3764 
3765         for (i = 0; i < hash->size; i++) {
3766                 head = &hash->table[i];
3767 
3768                 rcu_read_lock();
3769                 hlist_for_each_entry_rcu(tt_common_entry,
3770                                          head, hash_entry) {
3771                         if (enable) {
3772                                 if ((tt_common_entry->flags & flags) == flags)
3773                                         continue;
3774                                 tt_common_entry->flags |= flags;
3775                         } else {
3776                                 if (!(tt_common_entry->flags & flags))
3777                                         continue;
3778                                 tt_common_entry->flags &= ~flags;
3779                         }
3780 
3781                         if (!count)
3782                                 continue;
3783 
3784                         batadv_tt_local_size_inc(bat_priv,
3785                                                  tt_common_entry->vid);
3786                 }
3787                 rcu_read_unlock();
3788         }
3789 }
3790 
3791 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3792 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3793 {
3794         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3795         struct batadv_tt_common_entry *tt_common;
3796         struct batadv_tt_local_entry *tt_local;
3797         struct hlist_node *node_tmp;
3798         struct hlist_head *head;
3799         spinlock_t *list_lock; /* protects write access to the hash lists */
3800         u32 i;
3801 
3802         if (!hash)
3803                 return;
3804 
3805         for (i = 0; i < hash->size; i++) {
3806                 head = &hash->table[i];
3807                 list_lock = &hash->list_locks[i];
3808 
3809                 spin_lock_bh(list_lock);
3810                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3811                                           hash_entry) {
3812                         if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3813                                 continue;
3814 
3815                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3816                                    "Deleting local tt entry (%pM, vid: %d): pending\n",
3817                                    tt_common->addr,
3818                                    batadv_print_vid(tt_common->vid));
3819 
3820                         batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3821                         hlist_del_rcu(&tt_common->hash_entry);
3822                         tt_local = container_of(tt_common,
3823                                                 struct batadv_tt_local_entry,
3824                                                 common);
3825 
3826                         batadv_tt_local_entry_put(tt_local);
3827                 }
3828                 spin_unlock_bh(list_lock);
3829         }
3830 }
3831 
3832 /**
3833  * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3834  *  which have been queued in the time since the last commit
3835  * @bat_priv: the bat priv with all the soft interface information
3836  *
3837  * Caller must hold tt->commit_lock.
3838  */
3839 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3840 {
3841         lockdep_assert_held(&bat_priv->tt.commit_lock);
3842 
3843         if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3844                 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3845                         batadv_tt_tvlv_container_update(bat_priv);
3846                 return;
3847         }
3848 
3849         batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3850 
3851         batadv_tt_local_purge_pending_clients(bat_priv);
3852         batadv_tt_local_update_crc(bat_priv);
3853 
3854         /* Increment the TTVN only once per OGM interval */
3855         atomic_inc(&bat_priv->tt.vn);
3856         batadv_dbg(BATADV_DBG_TT, bat_priv,
3857                    "Local changes committed, updating to ttvn %u\n",
3858                    (u8)atomic_read(&bat_priv->tt.vn));
3859 
3860         /* reset the sending counter */
3861         atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3862         batadv_tt_tvlv_container_update(bat_priv);
3863 }
3864 
3865 /**
3866  * batadv_tt_local_commit_changes - commit all pending local tt changes which
3867  *  have been queued in the time since the last commit
3868  * @bat_priv: the bat priv with all the soft interface information
3869  */
3870 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3871 {
3872         spin_lock_bh(&bat_priv->tt.commit_lock);
3873         batadv_tt_local_commit_changes_nolock(bat_priv);
3874         spin_unlock_bh(&bat_priv->tt.commit_lock);
3875 }
3876 
3877 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, u8 *src, u8 *dst,
3878                            unsigned short vid)
3879 {
3880         struct batadv_tt_local_entry *tt_local_entry;
3881         struct batadv_tt_global_entry *tt_global_entry;
3882         struct batadv_softif_vlan *vlan;
3883         bool ret = false;
3884 
3885         vlan = batadv_softif_vlan_get(bat_priv, vid);
3886         if (!vlan)
3887                 return false;
3888 
3889         if (!atomic_read(&vlan->ap_isolation))
3890                 goto vlan_put;
3891 
3892         tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3893         if (!tt_local_entry)
3894                 goto vlan_put;
3895 
3896         tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
3897         if (!tt_global_entry)
3898                 goto local_entry_put;
3899 
3900         if (_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3901                 ret = true;
3902 
3903         batadv_tt_global_entry_put(tt_global_entry);
3904 local_entry_put:
3905         batadv_tt_local_entry_put(tt_local_entry);
3906 vlan_put:
3907         batadv_softif_vlan_put(vlan);
3908         return ret;
3909 }
3910 
3911 /**
3912  * batadv_tt_update_orig - update global translation table with new tt
3913  *  information received via ogms
3914  * @bat_priv: the bat priv with all the soft interface information
3915  * @orig_node: the orig_node of the ogm
3916  * @tt_buff: pointer to the first tvlv VLAN entry
3917  * @tt_num_vlan: number of tvlv VLAN entries
3918  * @tt_change: pointer to the first entry in the TT buffer
3919  * @tt_num_changes: number of tt changes inside the tt buffer
3920  * @ttvn: translation table version number of this changeset
3921  */
3922 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
3923                                   struct batadv_orig_node *orig_node,
3924                                   const void *tt_buff, u16 tt_num_vlan,
3925                                   struct batadv_tvlv_tt_change *tt_change,
3926                                   u16 tt_num_changes, u8 ttvn)
3927 {
3928         u8 orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn);
3929         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3930         bool full_table = true;
3931         bool has_tt_init;
3932 
3933         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
3934         has_tt_init = test_bit(BATADV_ORIG_CAPA_HAS_TT,
3935                                &orig_node->capa_initialized);
3936 
3937         /* orig table not initialised AND first diff is in the OGM OR the ttvn
3938          * increased by one -> we can apply the attached changes
3939          */
3940         if ((!has_tt_init && ttvn == 1) || ttvn - orig_ttvn == 1) {
3941                 /* the OGM could not contain the changes due to their size or
3942                  * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3943                  * times.
3944                  * In this case send a tt request
3945                  */
3946                 if (!tt_num_changes) {
3947                         full_table = false;
3948                         goto request_table;
3949                 }
3950 
3951                 spin_lock_bh(&orig_node->tt_lock);
3952 
3953                 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
3954                                          ttvn, tt_change);
3955 
3956                 /* Even if we received the precomputed crc with the OGM, we
3957                  * prefer to recompute it to spot any possible inconsistency
3958                  * in the global table
3959                  */
3960                 batadv_tt_global_update_crc(bat_priv, orig_node);
3961 
3962                 spin_unlock_bh(&orig_node->tt_lock);
3963 
3964                 /* The ttvn alone is not enough to guarantee consistency
3965                  * because a single value could represent different states
3966                  * (due to the wrap around). Thus a node has to check whether
3967                  * the resulting table (after applying the changes) is still
3968                  * consistent or not. E.g. a node could disconnect while its
3969                  * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3970                  * checking the CRC value is mandatory to detect the
3971                  * inconsistency
3972                  */
3973                 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
3974                                                 tt_num_vlan))
3975                         goto request_table;
3976         } else {
3977                 /* if we missed more than one change or our tables are not
3978                  * in sync anymore -> request fresh tt data
3979                  */
3980                 if (!has_tt_init || ttvn != orig_ttvn ||
3981                     !batadv_tt_global_check_crc(orig_node, tt_vlan,
3982                                                 tt_num_vlan)) {
3983 request_table:
3984                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3985                                    "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3986                                    orig_node->orig, ttvn, orig_ttvn,
3987                                    tt_num_changes);
3988                         batadv_send_tt_request(bat_priv, orig_node, ttvn,
3989                                                tt_vlan, tt_num_vlan,
3990                                                full_table);
3991                         return;
3992                 }
3993         }
3994 }
3995 
3996 /**
3997  * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3998  * @bat_priv: the bat priv with all the soft interface information
3999  * @addr: the mac address of the client to check
4000  * @vid: VLAN identifier
4001  *
4002  * Return: true if we know that the client has moved from its old originator
4003  * to another one. This entry is still kept for consistency purposes and will be
4004  * deleted later by a DEL or because of timeout
4005  */
4006 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
4007                                         u8 *addr, unsigned short vid)
4008 {
4009         struct batadv_tt_global_entry *tt_global_entry;
4010         bool ret = false;
4011 
4012         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
4013         if (!tt_global_entry)
4014                 goto out;
4015 
4016         ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
4017         batadv_tt_global_entry_put(tt_global_entry);
4018 out:
4019         return ret;
4020 }
4021 
4022 /**
4023  * batadv_tt_local_client_is_roaming - tells whether the client is roaming
4024  * @bat_priv: the bat priv with all the soft interface information
4025  * @addr: the mac address of the local client to query
4026  * @vid: VLAN identifier
4027  *
4028  * Return: true if the local client is known to be roaming (it is not served by
4029  * this node anymore) or not. If yes, the client is still present in the table
4030  * to keep the latter consistent with the node TTVN
4031  */
4032 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
4033                                        u8 *addr, unsigned short vid)
4034 {
4035         struct batadv_tt_local_entry *tt_local_entry;
4036         bool ret = false;
4037 
4038         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
4039         if (!tt_local_entry)
4040                 goto out;
4041 
4042         ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
4043         batadv_tt_local_entry_put(tt_local_entry);
4044 out:
4045         return ret;
4046 }
4047 
4048 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
4049                                           struct batadv_orig_node *orig_node,
4050                                           const unsigned char *addr,
4051                                           unsigned short vid)
4052 {
4053         /* ignore loop detect macs, they are not supposed to be in the tt local
4054          * data as well.
4055          */
4056         if (batadv_bla_is_loopdetect_mac(addr))
4057                 return false;
4058 
4059         if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
4060                                   BATADV_TT_CLIENT_TEMP,
4061                                   atomic_read(&orig_node->last_ttvn)))
4062                 return false;
4063 
4064         batadv_dbg(BATADV_DBG_TT, bat_priv,
4065                    "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
4066                    addr, batadv_print_vid(vid), orig_node->orig);
4067 
4068         return true;
4069 }
4070 
4071 /**
4072  * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
4073  *  maximum packet size that can be transported through the mesh
4074  * @soft_iface: netdev struct of the mesh interface
4075  *
4076  * Remove entries older than 'timeout' and half timeout if more entries need
4077  * to be removed.
4078  */
4079 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
4080 {
4081         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
4082         int packet_size_max = atomic_read(&bat_priv->packet_size_max);
4083         int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
4084         bool reduced = false;
4085 
4086         spin_lock_bh(&bat_priv->tt.commit_lock);
4087 
4088         while (true) {
4089                 table_size = batadv_tt_local_table_transmit_size(bat_priv);
4090                 if (packet_size_max >= table_size)
4091                         break;
4092 
4093                 batadv_tt_local_purge(bat_priv, timeout);
4094                 batadv_tt_local_purge_pending_clients(bat_priv);
4095 
4096                 timeout /= 2;
4097                 reduced = true;
4098                 net_ratelimited_function(batadv_info, soft_iface,
4099                                          "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
4100                                          packet_size_max);
4101         }
4102 
4103         /* commit these changes immediately, to avoid synchronization problem
4104          * with the TTVN
4105          */
4106         if (reduced)
4107                 batadv_tt_local_commit_changes_nolock(bat_priv);
4108 
4109         spin_unlock_bh(&bat_priv->tt.commit_lock);
4110 }
4111 
4112 /**
4113  * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
4114  * @bat_priv: the bat priv with all the soft interface information
4115  * @orig: the orig_node of the ogm
4116  * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
4117  * @tvlv_value: tvlv buffer containing the gateway data
4118  * @tvlv_value_len: tvlv buffer length
4119  */
4120 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
4121                                           struct batadv_orig_node *orig,
4122                                           u8 flags, void *tvlv_value,
4123                                           u16 tvlv_value_len)
4124 {
4125         struct batadv_tvlv_tt_vlan_data *tt_vlan;
4126         struct batadv_tvlv_tt_change *tt_change;
4127         struct batadv_tvlv_tt_data *tt_data;
4128         u16 num_entries, num_vlan;
4129 
4130         if (tvlv_value_len < sizeof(*tt_data))
4131                 return;
4132 
4133         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
4134         tvlv_value_len -= sizeof(*tt_data);
4135 
4136         num_vlan = ntohs(tt_data->num_vlan);
4137 
4138         if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
4139                 return;
4140 
4141         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
4142         tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
4143         tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
4144 
4145         num_entries = batadv_tt_entries(tvlv_value_len);
4146 
4147         batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
4148                               num_entries, tt_data->ttvn);
4149 }
4150 
4151 /**
4152  * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
4153  *  container
4154  * @bat_priv: the bat priv with all the soft interface information
4155  * @src: mac address of tt tvlv sender
4156  * @dst: mac address of tt tvlv recipient
4157  * @tvlv_value: tvlv buffer containing the tt data
4158  * @tvlv_value_len: tvlv buffer length
4159  *
4160  * Return: NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
4161  * otherwise.
4162  */
4163 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
4164                                              u8 *src, u8 *dst,
4165                                              void *tvlv_value,
4166                                              u16 tvlv_value_len)
4167 {
4168         struct batadv_tvlv_tt_data *tt_data;
4169         u16 tt_vlan_len, tt_num_entries;
4170         char tt_flag;
4171         bool ret;
4172 
4173         if (tvlv_value_len < sizeof(*tt_data))
4174                 return NET_RX_SUCCESS;
4175 
4176         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
4177         tvlv_value_len -= sizeof(*tt_data);
4178 
4179         tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
4180         tt_vlan_len *= ntohs(tt_data->num_vlan);
4181 
4182         if (tvlv_value_len < tt_vlan_len)
4183                 return NET_RX_SUCCESS;
4184 
4185         tvlv_value_len -= tt_vlan_len;
4186         tt_num_entries = batadv_tt_entries(tvlv_value_len);
4187 
4188         switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
4189         case BATADV_TT_REQUEST:
4190                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
4191 
4192                 /* If this node cannot provide a TT response the tt_request is
4193                  * forwarded
4194                  */
4195                 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
4196                 if (!ret) {
4197                         if (tt_data->flags & BATADV_TT_FULL_TABLE)
4198                                 tt_flag = 'F';
4199                         else
4200                                 tt_flag = '.';
4201 
4202                         batadv_dbg(BATADV_DBG_TT, bat_priv,
4203                                    "Routing TT_REQUEST to %pM [%c]\n",
4204                                    dst, tt_flag);
4205                         /* tvlv API will re-route the packet */
4206                         return NET_RX_DROP;
4207                 }
4208                 break;
4209         case BATADV_TT_RESPONSE:
4210                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
4211 
4212                 if (batadv_is_my_mac(bat_priv, dst)) {
4213                         batadv_handle_tt_response(bat_priv, tt_data,
4214                                                   src, tt_num_entries);
4215                         return NET_RX_SUCCESS;
4216                 }
4217 
4218                 if (tt_data->flags & BATADV_TT_FULL_TABLE)
4219                         tt_flag =  'F';
4220                 else
4221                         tt_flag = '.';
4222 
4223                 batadv_dbg(BATADV_DBG_TT, bat_priv,
4224                            "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
4225 
4226                 /* tvlv API will re-route the packet */
4227                 return NET_RX_DROP;
4228         }
4229 
4230         return NET_RX_SUCCESS;
4231 }
4232 
4233 /**
4234  * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
4235  * @bat_priv: the bat priv with all the soft interface information
4236  * @src: mac address of tt tvlv sender
4237  * @dst: mac address of tt tvlv recipient
4238  * @tvlv_value: tvlv buffer containing the tt data
4239  * @tvlv_value_len: tvlv buffer length
4240  *
4241  * Return: NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
4242  * otherwise.
4243  */
4244 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
4245                                                u8 *src, u8 *dst,
4246                                                void *tvlv_value,
4247                                                u16 tvlv_value_len)
4248 {
4249         struct batadv_tvlv_roam_adv *roaming_adv;
4250         struct batadv_orig_node *orig_node = NULL;
4251 
4252         /* If this node is not the intended recipient of the
4253          * roaming advertisement the packet is forwarded
4254          * (the tvlv API will re-route the packet).
4255          */
4256         if (!batadv_is_my_mac(bat_priv, dst))
4257                 return NET_RX_DROP;
4258 
4259         if (tvlv_value_len < sizeof(*roaming_adv))
4260                 goto out;
4261 
4262         orig_node = batadv_orig_hash_find(bat_priv, src);
4263         if (!orig_node)
4264                 goto out;
4265 
4266         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
4267         roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
4268 
4269         batadv_dbg(BATADV_DBG_TT, bat_priv,
4270                    "Received ROAMING_ADV from %pM (client %pM)\n",
4271                    src, roaming_adv->client);
4272 
4273         batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
4274                              ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
4275                              atomic_read(&orig_node->last_ttvn) + 1);
4276 
4277 out:
4278         if (orig_node)
4279                 batadv_orig_node_put(orig_node);
4280         return NET_RX_SUCCESS;
4281 }
4282 
4283 /**
4284  * batadv_tt_init - initialise the translation table internals
4285  * @bat_priv: the bat priv with all the soft interface information
4286  *
4287  * Return: 0 on success or negative error number in case of failure.
4288  */
4289 int batadv_tt_init(struct batadv_priv *bat_priv)
4290 {
4291         int ret;
4292 
4293         /* synchronized flags must be remote */
4294         BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
4295 
4296         ret = batadv_tt_local_init(bat_priv);
4297         if (ret < 0)
4298                 return ret;
4299 
4300         ret = batadv_tt_global_init(bat_priv);
4301         if (ret < 0)
4302                 return ret;
4303 
4304         batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
4305                                      batadv_tt_tvlv_unicast_handler_v1,
4306                                      BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
4307 
4308         batadv_tvlv_handler_register(bat_priv, NULL,
4309                                      batadv_roam_tvlv_unicast_handler_v1,
4310                                      BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
4311 
4312         INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
4313         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
4314                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
4315 
4316         return 1;
4317 }
4318 
4319 /**
4320  * batadv_tt_global_is_isolated - check if a client is marked as isolated
4321  * @bat_priv: the bat priv with all the soft interface information
4322  * @addr: the mac address of the client
4323  * @vid: the identifier of the VLAN where this client is connected
4324  *
4325  * Return: true if the client is marked with the TT_CLIENT_ISOLA flag, false
4326  * otherwise
4327  */
4328 bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
4329                                   const u8 *addr, unsigned short vid)
4330 {
4331         struct batadv_tt_global_entry *tt;
4332         bool ret;
4333 
4334         tt = batadv_tt_global_hash_find(bat_priv, addr, vid);
4335         if (!tt)
4336                 return false;
4337 
4338         ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA;
4339 
4340         batadv_tt_global_entry_put(tt);
4341 
4342         return ret;
4343 }
4344 
4345 /**
4346  * batadv_tt_cache_init - Initialize tt memory object cache
4347  *
4348  * Return: 0 on success or negative error number in case of failure.
4349  */
4350 int __init batadv_tt_cache_init(void)
4351 {
4352         size_t tl_size = sizeof(struct batadv_tt_local_entry);
4353         size_t tg_size = sizeof(struct batadv_tt_global_entry);
4354         size_t tt_orig_size = sizeof(struct batadv_tt_orig_list_entry);
4355         size_t tt_change_size = sizeof(struct batadv_tt_change_node);
4356         size_t tt_req_size = sizeof(struct batadv_tt_req_node);
4357         size_t tt_roam_size = sizeof(struct batadv_tt_roam_node);
4358 
4359         batadv_tl_cache = kmem_cache_create("batadv_tl_cache", tl_size, 0,
4360                                             SLAB_HWCACHE_ALIGN, NULL);
4361         if (!batadv_tl_cache)
4362                 return -ENOMEM;
4363 
4364         batadv_tg_cache = kmem_cache_create("batadv_tg_cache", tg_size, 0,
4365                                             SLAB_HWCACHE_ALIGN, NULL);
4366         if (!batadv_tg_cache)
4367                 goto err_tt_tl_destroy;
4368 
4369         batadv_tt_orig_cache = kmem_cache_create("batadv_tt_orig_cache",
4370                                                  tt_orig_size, 0,
4371                                                  SLAB_HWCACHE_ALIGN, NULL);
4372         if (!batadv_tt_orig_cache)
4373                 goto err_tt_tg_destroy;
4374 
4375         batadv_tt_change_cache = kmem_cache_create("batadv_tt_change_cache",
4376                                                    tt_change_size, 0,
4377                                                    SLAB_HWCACHE_ALIGN, NULL);
4378         if (!batadv_tt_change_cache)
4379                 goto err_tt_orig_destroy;
4380 
4381         batadv_tt_req_cache = kmem_cache_create("batadv_tt_req_cache",
4382                                                 tt_req_size, 0,
4383                                                 SLAB_HWCACHE_ALIGN, NULL);
4384         if (!batadv_tt_req_cache)
4385                 goto err_tt_change_destroy;
4386 
4387         batadv_tt_roam_cache = kmem_cache_create("batadv_tt_roam_cache",
4388                                                  tt_roam_size, 0,
4389                                                  SLAB_HWCACHE_ALIGN, NULL);
4390         if (!batadv_tt_roam_cache)
4391                 goto err_tt_req_destroy;
4392 
4393         return 0;
4394 
4395 err_tt_req_destroy:
4396         kmem_cache_destroy(batadv_tt_req_cache);
4397         batadv_tt_req_cache = NULL;
4398 err_tt_change_destroy:
4399         kmem_cache_destroy(batadv_tt_change_cache);
4400         batadv_tt_change_cache = NULL;
4401 err_tt_orig_destroy:
4402         kmem_cache_destroy(batadv_tt_orig_cache);
4403         batadv_tt_orig_cache = NULL;
4404 err_tt_tg_destroy:
4405         kmem_cache_destroy(batadv_tg_cache);
4406         batadv_tg_cache = NULL;
4407 err_tt_tl_destroy:
4408         kmem_cache_destroy(batadv_tl_cache);
4409         batadv_tl_cache = NULL;
4410 
4411         return -ENOMEM;
4412 }
4413 
4414 /**
4415  * batadv_tt_cache_destroy - Destroy tt memory object cache
4416  */
4417 void batadv_tt_cache_destroy(void)
4418 {
4419         kmem_cache_destroy(batadv_tl_cache);
4420         kmem_cache_destroy(batadv_tg_cache);
4421         kmem_cache_destroy(batadv_tt_orig_cache);
4422         kmem_cache_destroy(batadv_tt_change_cache);
4423         kmem_cache_destroy(batadv_tt_req_cache);
4424         kmem_cache_destroy(batadv_tt_roam_cache);
4425 }
4426 

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