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

Version: ~ [ linux-5.5-rc7 ] ~ [ linux-5.4.13 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.97 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.166 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.210 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.210 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.81 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /* Copyright (C) 2007-2014 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 "main.h"
 19 #include "translation-table.h"
 20 #include "soft-interface.h"
 21 #include "hard-interface.h"
 22 #include "send.h"
 23 #include "hash.h"
 24 #include "originator.h"
 25 #include "routing.h"
 26 #include "bridge_loop_avoidance.h"
 27 #include "multicast.h"
 28 
 29 #include <linux/crc32c.h>
 30 
 31 /* hash class keys */
 32 static struct lock_class_key batadv_tt_local_hash_lock_class_key;
 33 static struct lock_class_key batadv_tt_global_hash_lock_class_key;
 34 
 35 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
 36                                  unsigned short vid,
 37                                  struct batadv_orig_node *orig_node);
 38 static void batadv_tt_purge(struct work_struct *work);
 39 static void
 40 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
 41 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
 42                                  struct batadv_orig_node *orig_node,
 43                                  const unsigned char *addr,
 44                                  unsigned short vid, const char *message,
 45                                  bool roaming);
 46 
 47 /* returns 1 if they are the same mac addr */
 48 static int batadv_compare_tt(const struct hlist_node *node, const void *data2)
 49 {
 50         const void *data1 = container_of(node, struct batadv_tt_common_entry,
 51                                          hash_entry);
 52 
 53         return batadv_compare_eth(data1, data2);
 54 }
 55 
 56 /**
 57  * batadv_choose_tt - return the index of the tt entry in the hash table
 58  * @data: pointer to the tt_common_entry object to map
 59  * @size: the size of the hash table
 60  *
 61  * Returns the hash index where the object represented by 'data' should be
 62  * stored at.
 63  */
 64 static inline uint32_t batadv_choose_tt(const void *data, uint32_t size)
 65 {
 66         struct batadv_tt_common_entry *tt;
 67         uint32_t hash = 0;
 68 
 69         tt = (struct batadv_tt_common_entry *)data;
 70         hash = batadv_hash_bytes(hash, &tt->addr, ETH_ALEN);
 71         hash = batadv_hash_bytes(hash, &tt->vid, sizeof(tt->vid));
 72 
 73         hash += (hash << 3);
 74         hash ^= (hash >> 11);
 75         hash += (hash << 15);
 76 
 77         return hash % size;
 78 }
 79 
 80 /**
 81  * batadv_tt_hash_find - look for a client in the given hash table
 82  * @hash: the hash table to search
 83  * @addr: the mac address of the client to look for
 84  * @vid: VLAN identifier
 85  *
 86  * Returns a pointer to the tt_common struct belonging to the searched client if
 87  * found, NULL otherwise.
 88  */
 89 static struct batadv_tt_common_entry *
 90 batadv_tt_hash_find(struct batadv_hashtable *hash, const uint8_t *addr,
 91                     unsigned short vid)
 92 {
 93         struct hlist_head *head;
 94         struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL;
 95         uint32_t index;
 96 
 97         if (!hash)
 98                 return NULL;
 99 
100         ether_addr_copy(to_search.addr, addr);
101         to_search.vid = vid;
102 
103         index = batadv_choose_tt(&to_search, hash->size);
104         head = &hash->table[index];
105 
106         rcu_read_lock();
107         hlist_for_each_entry_rcu(tt, head, hash_entry) {
108                 if (!batadv_compare_eth(tt, addr))
109                         continue;
110 
111                 if (tt->vid != vid)
112                         continue;
113 
114                 if (!atomic_inc_not_zero(&tt->refcount))
115                         continue;
116 
117                 tt_tmp = tt;
118                 break;
119         }
120         rcu_read_unlock();
121 
122         return tt_tmp;
123 }
124 
125 /**
126  * batadv_tt_local_hash_find - search the local table for a given client
127  * @bat_priv: the bat priv with all the soft interface information
128  * @addr: the mac address of the client to look for
129  * @vid: VLAN identifier
130  *
131  * Returns a pointer to the corresponding tt_local_entry struct if the client is
132  * found, NULL otherwise.
133  */
134 static struct batadv_tt_local_entry *
135 batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const uint8_t *addr,
136                           unsigned short vid)
137 {
138         struct batadv_tt_common_entry *tt_common_entry;
139         struct batadv_tt_local_entry *tt_local_entry = NULL;
140 
141         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, addr,
142                                               vid);
143         if (tt_common_entry)
144                 tt_local_entry = container_of(tt_common_entry,
145                                               struct batadv_tt_local_entry,
146                                               common);
147         return tt_local_entry;
148 }
149 
150 /**
151  * batadv_tt_global_hash_find - search the global table for a given client
152  * @bat_priv: the bat priv with all the soft interface information
153  * @addr: the mac address of the client to look for
154  * @vid: VLAN identifier
155  *
156  * Returns a pointer to the corresponding tt_global_entry struct if the client
157  * is found, NULL otherwise.
158  */
159 static struct batadv_tt_global_entry *
160 batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const uint8_t *addr,
161                            unsigned short vid)
162 {
163         struct batadv_tt_common_entry *tt_common_entry;
164         struct batadv_tt_global_entry *tt_global_entry = NULL;
165 
166         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, addr,
167                                               vid);
168         if (tt_common_entry)
169                 tt_global_entry = container_of(tt_common_entry,
170                                                struct batadv_tt_global_entry,
171                                                common);
172         return tt_global_entry;
173 }
174 
175 static void
176 batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry)
177 {
178         if (atomic_dec_and_test(&tt_local_entry->common.refcount))
179                 kfree_rcu(tt_local_entry, common.rcu);
180 }
181 
182 /**
183  * batadv_tt_global_entry_free_ref - decrement the refcounter for a
184  *  tt_global_entry and possibly free it
185  * @tt_global_entry: the object to free
186  */
187 static void
188 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry)
189 {
190         if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
191                 batadv_tt_global_del_orig_list(tt_global_entry);
192                 kfree_rcu(tt_global_entry, common.rcu);
193         }
194 }
195 
196 /**
197  * batadv_tt_global_hash_count - count the number of orig entries
198  * @hash: hash table containing the tt entries
199  * @addr: the mac address of the client to count entries for
200  * @vid: VLAN identifier
201  *
202  * Return the number of originators advertising the given address/data
203  * (excluding ourself).
204  */
205 int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
206                                 const uint8_t *addr, unsigned short vid)
207 {
208         struct batadv_tt_global_entry *tt_global_entry;
209         int count;
210 
211         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
212         if (!tt_global_entry)
213                 return 0;
214 
215         count = atomic_read(&tt_global_entry->orig_list_count);
216         batadv_tt_global_entry_free_ref(tt_global_entry);
217 
218         return count;
219 }
220 
221 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
222 {
223         struct batadv_tt_orig_list_entry *orig_entry;
224 
225         orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu);
226 
227         /* We are in an rcu callback here, therefore we cannot use
228          * batadv_orig_node_free_ref() and its call_rcu():
229          * An rcu_barrier() wouldn't wait for that to finish
230          */
231         batadv_orig_node_free_ref_now(orig_entry->orig_node);
232         kfree(orig_entry);
233 }
234 
235 /**
236  * batadv_tt_local_size_mod - change the size by v of the local table identified
237  *  by vid
238  * @bat_priv: the bat priv with all the soft interface information
239  * @vid: the VLAN identifier of the sub-table to change
240  * @v: the amount to sum to the local table size
241  */
242 static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
243                                      unsigned short vid, int v)
244 {
245         struct batadv_softif_vlan *vlan;
246 
247         vlan = batadv_softif_vlan_get(bat_priv, vid);
248         if (!vlan)
249                 return;
250 
251         atomic_add(v, &vlan->tt.num_entries);
252 
253         batadv_softif_vlan_free_ref(vlan);
254 }
255 
256 /**
257  * batadv_tt_local_size_inc - increase by one the local table size for the given
258  *  vid
259  * @bat_priv: the bat priv with all the soft interface information
260  * @vid: the VLAN identifier
261  */
262 static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv,
263                                      unsigned short vid)
264 {
265         batadv_tt_local_size_mod(bat_priv, vid, 1);
266 }
267 
268 /**
269  * batadv_tt_local_size_dec - decrease by one the local table size for the given
270  *  vid
271  * @bat_priv: the bat priv with all the soft interface information
272  * @vid: the VLAN identifier
273  */
274 static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv,
275                                      unsigned short vid)
276 {
277         batadv_tt_local_size_mod(bat_priv, vid, -1);
278 }
279 
280 /**
281  * batadv_tt_global_size_mod - change the size by v of the local table
282  *  identified by vid
283  * @bat_priv: the bat priv with all the soft interface information
284  * @vid: the VLAN identifier
285  * @v: the amount to sum to the global table size
286  */
287 static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node,
288                                       unsigned short vid, int v)
289 {
290         struct batadv_orig_node_vlan *vlan;
291 
292         vlan = batadv_orig_node_vlan_new(orig_node, vid);
293         if (!vlan)
294                 return;
295 
296         if (atomic_add_return(v, &vlan->tt.num_entries) == 0) {
297                 spin_lock_bh(&orig_node->vlan_list_lock);
298                 list_del_rcu(&vlan->list);
299                 spin_unlock_bh(&orig_node->vlan_list_lock);
300                 batadv_orig_node_vlan_free_ref(vlan);
301         }
302 
303         batadv_orig_node_vlan_free_ref(vlan);
304 }
305 
306 /**
307  * batadv_tt_global_size_inc - increase by one the global table size for the
308  *  given vid
309  * @orig_node: the originator which global table size has to be decreased
310  * @vid: the vlan identifier
311  */
312 static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
313                                       unsigned short vid)
314 {
315         batadv_tt_global_size_mod(orig_node, vid, 1);
316 }
317 
318 /**
319  * batadv_tt_global_size_dec - decrease by one the global table size for the
320  *  given vid
321  * @orig_node: the originator which global table size has to be decreased
322  * @vid: the vlan identifier
323  */
324 static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
325                                       unsigned short vid)
326 {
327         batadv_tt_global_size_mod(orig_node, vid, -1);
328 }
329 
330 static void
331 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry)
332 {
333         if (!atomic_dec_and_test(&orig_entry->refcount))
334                 return;
335 
336         call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
337 }
338 
339 /**
340  * batadv_tt_local_event - store a local TT event (ADD/DEL)
341  * @bat_priv: the bat priv with all the soft interface information
342  * @tt_local_entry: the TT entry involved in the event
343  * @event_flags: flags to store in the event structure
344  */
345 static void batadv_tt_local_event(struct batadv_priv *bat_priv,
346                                   struct batadv_tt_local_entry *tt_local_entry,
347                                   uint8_t event_flags)
348 {
349         struct batadv_tt_change_node *tt_change_node, *entry, *safe;
350         struct batadv_tt_common_entry *common = &tt_local_entry->common;
351         uint8_t flags = common->flags | event_flags;
352         bool event_removed = false;
353         bool del_op_requested, del_op_entry;
354 
355         tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
356         if (!tt_change_node)
357                 return;
358 
359         tt_change_node->change.flags = flags;
360         memset(tt_change_node->change.reserved, 0,
361                sizeof(tt_change_node->change.reserved));
362         ether_addr_copy(tt_change_node->change.addr, common->addr);
363         tt_change_node->change.vid = htons(common->vid);
364 
365         del_op_requested = flags & BATADV_TT_CLIENT_DEL;
366 
367         /* check for ADD+DEL or DEL+ADD events */
368         spin_lock_bh(&bat_priv->tt.changes_list_lock);
369         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
370                                  list) {
371                 if (!batadv_compare_eth(entry->change.addr, common->addr))
372                         continue;
373 
374                 /* DEL+ADD in the same orig interval have no effect and can be
375                  * removed to avoid silly behaviour on the receiver side. The
376                  * other way around (ADD+DEL) can happen in case of roaming of
377                  * a client still in the NEW state. Roaming of NEW clients is
378                  * now possible due to automatically recognition of "temporary"
379                  * clients
380                  */
381                 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
382                 if (!del_op_requested && del_op_entry)
383                         goto del;
384                 if (del_op_requested && !del_op_entry)
385                         goto del;
386 
387                 /* this is a second add in the same originator interval. It
388                  * means that flags have been changed: update them!
389                  */
390                 if (!del_op_requested && !del_op_entry)
391                         entry->change.flags = flags;
392 
393                 continue;
394 del:
395                 list_del(&entry->list);
396                 kfree(entry);
397                 kfree(tt_change_node);
398                 event_removed = true;
399                 goto unlock;
400         }
401 
402         /* track the change in the OGMinterval list */
403         list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
404 
405 unlock:
406         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
407 
408         if (event_removed)
409                 atomic_dec(&bat_priv->tt.local_changes);
410         else
411                 atomic_inc(&bat_priv->tt.local_changes);
412 }
413 
414 /**
415  * batadv_tt_len - compute length in bytes of given number of tt changes
416  * @changes_num: number of tt changes
417  *
418  * Returns computed length in bytes.
419  */
420 static int batadv_tt_len(int changes_num)
421 {
422         return changes_num * sizeof(struct batadv_tvlv_tt_change);
423 }
424 
425 /**
426  * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
427  * @tt_len: available space
428  *
429  * Returns the number of entries.
430  */
431 static uint16_t batadv_tt_entries(uint16_t tt_len)
432 {
433         return tt_len / batadv_tt_len(1);
434 }
435 
436 /**
437  * batadv_tt_local_table_transmit_size - calculates the local translation table
438  *  size when transmitted over the air
439  * @bat_priv: the bat priv with all the soft interface information
440  *
441  * Returns local translation table size in bytes.
442  */
443 static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
444 {
445         uint16_t num_vlan = 0, tt_local_entries = 0;
446         struct batadv_softif_vlan *vlan;
447         int hdr_size;
448 
449         rcu_read_lock();
450         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
451                 num_vlan++;
452                 tt_local_entries += atomic_read(&vlan->tt.num_entries);
453         }
454         rcu_read_unlock();
455 
456         /* header size of tvlv encapsulated tt response payload */
457         hdr_size = sizeof(struct batadv_unicast_tvlv_packet);
458         hdr_size += sizeof(struct batadv_tvlv_hdr);
459         hdr_size += sizeof(struct batadv_tvlv_tt_data);
460         hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data);
461 
462         return hdr_size + batadv_tt_len(tt_local_entries);
463 }
464 
465 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
466 {
467         if (bat_priv->tt.local_hash)
468                 return 0;
469 
470         bat_priv->tt.local_hash = batadv_hash_new(1024);
471 
472         if (!bat_priv->tt.local_hash)
473                 return -ENOMEM;
474 
475         batadv_hash_set_lock_class(bat_priv->tt.local_hash,
476                                    &batadv_tt_local_hash_lock_class_key);
477 
478         return 0;
479 }
480 
481 static void batadv_tt_global_free(struct batadv_priv *bat_priv,
482                                   struct batadv_tt_global_entry *tt_global,
483                                   const char *message)
484 {
485         batadv_dbg(BATADV_DBG_TT, bat_priv,
486                    "Deleting global tt entry %pM (vid: %d): %s\n",
487                    tt_global->common.addr,
488                    BATADV_PRINT_VID(tt_global->common.vid), message);
489 
490         batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
491                            batadv_choose_tt, &tt_global->common);
492         batadv_tt_global_entry_free_ref(tt_global);
493 }
494 
495 /**
496  * batadv_tt_local_add - add a new client to the local table or update an
497  *  existing client
498  * @soft_iface: netdev struct of the mesh interface
499  * @addr: the mac address of the client to add
500  * @vid: VLAN identifier
501  * @ifindex: index of the interface where the client is connected to (useful to
502  *  identify wireless clients)
503  * @mark: the value contained in the skb->mark field of the received packet (if
504  *  any)
505  *
506  * Returns true if the client was successfully added, false otherwise.
507  */
508 bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
509                          unsigned short vid, int ifindex, uint32_t mark)
510 {
511         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
512         struct batadv_tt_local_entry *tt_local;
513         struct batadv_tt_global_entry *tt_global = NULL;
514         struct batadv_softif_vlan *vlan;
515         struct net_device *in_dev = NULL;
516         struct hlist_head *head;
517         struct batadv_tt_orig_list_entry *orig_entry;
518         int hash_added, table_size, packet_size_max;
519         bool ret = false, roamed_back = false;
520         uint8_t remote_flags;
521         uint32_t match_mark;
522 
523         if (ifindex != BATADV_NULL_IFINDEX)
524                 in_dev = dev_get_by_index(&init_net, ifindex);
525 
526         tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
527 
528         if (!is_multicast_ether_addr(addr))
529                 tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
530 
531         if (tt_local) {
532                 tt_local->last_seen = jiffies;
533                 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
534                         batadv_dbg(BATADV_DBG_TT, bat_priv,
535                                    "Re-adding pending client %pM (vid: %d)\n",
536                                    addr, BATADV_PRINT_VID(vid));
537                         /* whatever the reason why the PENDING flag was set,
538                          * this is a client which was enqueued to be removed in
539                          * this orig_interval. Since it popped up again, the
540                          * flag can be reset like it was never enqueued
541                          */
542                         tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
543                         goto add_event;
544                 }
545 
546                 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
547                         batadv_dbg(BATADV_DBG_TT, bat_priv,
548                                    "Roaming client %pM (vid: %d) came back to its original location\n",
549                                    addr, BATADV_PRINT_VID(vid));
550                         /* the ROAM flag is set because this client roamed away
551                          * and the node got a roaming_advertisement message. Now
552                          * that the client popped up again at its original
553                          * location such flag can be unset
554                          */
555                         tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
556                         roamed_back = true;
557                 }
558                 goto check_roaming;
559         }
560 
561         /* Ignore the client if we cannot send it in a full table response. */
562         table_size = batadv_tt_local_table_transmit_size(bat_priv);
563         table_size += batadv_tt_len(1);
564         packet_size_max = atomic_read(&bat_priv->packet_size_max);
565         if (table_size > packet_size_max) {
566                 net_ratelimited_function(batadv_info, soft_iface,
567                                          "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
568                                          table_size, packet_size_max, addr);
569                 goto out;
570         }
571 
572         tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC);
573         if (!tt_local)
574                 goto out;
575 
576         /* increase the refcounter of the related vlan */
577         vlan = batadv_softif_vlan_get(bat_priv, vid);
578 
579         batadv_dbg(BATADV_DBG_TT, bat_priv,
580                    "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
581                    addr, BATADV_PRINT_VID(vid),
582                    (uint8_t)atomic_read(&bat_priv->tt.vn));
583 
584         ether_addr_copy(tt_local->common.addr, addr);
585         /* The local entry has to be marked as NEW to avoid to send it in
586          * a full table response going out before the next ttvn increment
587          * (consistency check)
588          */
589         tt_local->common.flags = BATADV_TT_CLIENT_NEW;
590         tt_local->common.vid = vid;
591         if (batadv_is_wifi_netdev(in_dev))
592                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
593         atomic_set(&tt_local->common.refcount, 2);
594         tt_local->last_seen = jiffies;
595         tt_local->common.added_at = tt_local->last_seen;
596 
597         /* the batman interface mac and multicast addresses should never be
598          * purged
599          */
600         if (batadv_compare_eth(addr, soft_iface->dev_addr) ||
601             is_multicast_ether_addr(addr))
602                 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
603 
604         hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
605                                      batadv_choose_tt, &tt_local->common,
606                                      &tt_local->common.hash_entry);
607 
608         if (unlikely(hash_added != 0)) {
609                 /* remove the reference for the hash */
610                 batadv_tt_local_entry_free_ref(tt_local);
611                 batadv_softif_vlan_free_ref(vlan);
612                 goto out;
613         }
614 
615 add_event:
616         batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
617 
618 check_roaming:
619         /* Check whether it is a roaming, but don't do anything if the roaming
620          * process has already been handled
621          */
622         if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
623                 /* These node are probably going to update their tt table */
624                 head = &tt_global->orig_list;
625                 rcu_read_lock();
626                 hlist_for_each_entry_rcu(orig_entry, head, list) {
627                         batadv_send_roam_adv(bat_priv, tt_global->common.addr,
628                                              tt_global->common.vid,
629                                              orig_entry->orig_node);
630                 }
631                 rcu_read_unlock();
632                 if (roamed_back) {
633                         batadv_tt_global_free(bat_priv, tt_global,
634                                               "Roaming canceled");
635                         tt_global = NULL;
636                 } else {
637                         /* The global entry has to be marked as ROAMING and
638                          * has to be kept for consistency purpose
639                          */
640                         tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
641                         tt_global->roam_at = jiffies;
642                 }
643         }
644 
645         /* store the current remote flags before altering them. This helps
646          * understanding is flags are changing or not
647          */
648         remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK;
649 
650         if (batadv_is_wifi_netdev(in_dev))
651                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
652         else
653                 tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI;
654 
655         /* check the mark in the skb: if it's equal to the configured
656          * isolation_mark, it means the packet is coming from an isolated
657          * non-mesh client
658          */
659         match_mark = (mark & bat_priv->isolation_mark_mask);
660         if (bat_priv->isolation_mark_mask &&
661             match_mark == bat_priv->isolation_mark)
662                 tt_local->common.flags |= BATADV_TT_CLIENT_ISOLA;
663         else
664                 tt_local->common.flags &= ~BATADV_TT_CLIENT_ISOLA;
665 
666         /* if any "dynamic" flag has been modified, resend an ADD event for this
667          * entry so that all the nodes can get the new flags
668          */
669         if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
670                 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
671 
672         ret = true;
673 out:
674         if (in_dev)
675                 dev_put(in_dev);
676         if (tt_local)
677                 batadv_tt_local_entry_free_ref(tt_local);
678         if (tt_global)
679                 batadv_tt_global_entry_free_ref(tt_global);
680         return ret;
681 }
682 
683 /**
684  * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
685  *  within a TT Response directed to another node
686  * @orig_node: originator for which the TT data has to be prepared
687  * @tt_data: uninitialised pointer to the address of the TVLV buffer
688  * @tt_change: uninitialised pointer to the address of the area where the TT
689  *  changed can be stored
690  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
691  *  function reserves the amount of space needed to send the entire global TT
692  *  table. In case of success the value is updated with the real amount of
693  *  reserved bytes
694 
695  * Allocate the needed amount of memory for the entire TT TVLV and write its
696  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
697  * objects, one per active VLAN served by the originator node.
698  *
699  * Return the size of the allocated buffer or 0 in case of failure.
700  */
701 static uint16_t
702 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
703                                    struct batadv_tvlv_tt_data **tt_data,
704                                    struct batadv_tvlv_tt_change **tt_change,
705                                    int32_t *tt_len)
706 {
707         uint16_t num_vlan = 0, num_entries = 0, change_offset, tvlv_len;
708         struct batadv_tvlv_tt_vlan_data *tt_vlan;
709         struct batadv_orig_node_vlan *vlan;
710         uint8_t *tt_change_ptr;
711 
712         rcu_read_lock();
713         list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
714                 num_vlan++;
715                 num_entries += atomic_read(&vlan->tt.num_entries);
716         }
717 
718         change_offset = sizeof(**tt_data);
719         change_offset += num_vlan * sizeof(*tt_vlan);
720 
721         /* if tt_len is negative, allocate the space needed by the full table */
722         if (*tt_len < 0)
723                 *tt_len = batadv_tt_len(num_entries);
724 
725         tvlv_len = *tt_len;
726         tvlv_len += change_offset;
727 
728         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
729         if (!*tt_data) {
730                 *tt_len = 0;
731                 goto out;
732         }
733 
734         (*tt_data)->flags = BATADV_NO_FLAGS;
735         (*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
736         (*tt_data)->num_vlan = htons(num_vlan);
737 
738         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
739         list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
740                 tt_vlan->vid = htons(vlan->vid);
741                 tt_vlan->crc = htonl(vlan->tt.crc);
742 
743                 tt_vlan++;
744         }
745 
746         tt_change_ptr = (uint8_t *)*tt_data + change_offset;
747         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
748 
749 out:
750         rcu_read_unlock();
751         return tvlv_len;
752 }
753 
754 /**
755  * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
756  *  node
757  * @bat_priv: the bat priv with all the soft interface information
758  * @tt_data: uninitialised pointer to the address of the TVLV buffer
759  * @tt_change: uninitialised pointer to the address of the area where the TT
760  *  changes can be stored
761  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
762  *  function reserves the amount of space needed to send the entire local TT
763  *  table. In case of success the value is updated with the real amount of
764  *  reserved bytes
765  *
766  * Allocate the needed amount of memory for the entire TT TVLV and write its
767  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
768  * objects, one per active VLAN.
769  *
770  * Return the size of the allocated buffer or 0 in case of failure.
771  */
772 static uint16_t
773 batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
774                                   struct batadv_tvlv_tt_data **tt_data,
775                                   struct batadv_tvlv_tt_change **tt_change,
776                                   int32_t *tt_len)
777 {
778         struct batadv_tvlv_tt_vlan_data *tt_vlan;
779         struct batadv_softif_vlan *vlan;
780         uint16_t num_vlan = 0, num_entries = 0, tvlv_len;
781         uint8_t *tt_change_ptr;
782         int change_offset;
783 
784         rcu_read_lock();
785         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
786                 num_vlan++;
787                 num_entries += atomic_read(&vlan->tt.num_entries);
788         }
789 
790         change_offset = sizeof(**tt_data);
791         change_offset += num_vlan * sizeof(*tt_vlan);
792 
793         /* if tt_len is negative, allocate the space needed by the full table */
794         if (*tt_len < 0)
795                 *tt_len = batadv_tt_len(num_entries);
796 
797         tvlv_len = *tt_len;
798         tvlv_len += change_offset;
799 
800         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
801         if (!*tt_data) {
802                 tvlv_len = 0;
803                 goto out;
804         }
805 
806         (*tt_data)->flags = BATADV_NO_FLAGS;
807         (*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
808         (*tt_data)->num_vlan = htons(num_vlan);
809 
810         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
811         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
812                 tt_vlan->vid = htons(vlan->vid);
813                 tt_vlan->crc = htonl(vlan->tt.crc);
814 
815                 tt_vlan++;
816         }
817 
818         tt_change_ptr = (uint8_t *)*tt_data + change_offset;
819         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
820 
821 out:
822         rcu_read_unlock();
823         return tvlv_len;
824 }
825 
826 /**
827  * batadv_tt_tvlv_container_update - update the translation table tvlv container
828  *  after local tt changes have been committed
829  * @bat_priv: the bat priv with all the soft interface information
830  */
831 static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
832 {
833         struct batadv_tt_change_node *entry, *safe;
834         struct batadv_tvlv_tt_data *tt_data;
835         struct batadv_tvlv_tt_change *tt_change;
836         int tt_diff_len, tt_change_len = 0;
837         int tt_diff_entries_num = 0, tt_diff_entries_count = 0;
838         uint16_t tvlv_len;
839 
840         tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
841         tt_diff_len = batadv_tt_len(tt_diff_entries_num);
842 
843         /* if we have too many changes for one packet don't send any
844          * and wait for the tt table request which will be fragmented
845          */
846         if (tt_diff_len > bat_priv->soft_iface->mtu)
847                 tt_diff_len = 0;
848 
849         tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
850                                                      &tt_change, &tt_diff_len);
851         if (!tvlv_len)
852                 return;
853 
854         tt_data->flags = BATADV_TT_OGM_DIFF;
855 
856         if (tt_diff_len == 0)
857                 goto container_register;
858 
859         spin_lock_bh(&bat_priv->tt.changes_list_lock);
860         atomic_set(&bat_priv->tt.local_changes, 0);
861 
862         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
863                                  list) {
864                 if (tt_diff_entries_count < tt_diff_entries_num) {
865                         memcpy(tt_change + tt_diff_entries_count,
866                                &entry->change,
867                                sizeof(struct batadv_tvlv_tt_change));
868                         tt_diff_entries_count++;
869                 }
870                 list_del(&entry->list);
871                 kfree(entry);
872         }
873         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
874 
875         /* Keep the buffer for possible tt_request */
876         spin_lock_bh(&bat_priv->tt.last_changeset_lock);
877         kfree(bat_priv->tt.last_changeset);
878         bat_priv->tt.last_changeset_len = 0;
879         bat_priv->tt.last_changeset = NULL;
880         tt_change_len = batadv_tt_len(tt_diff_entries_count);
881         /* check whether this new OGM has no changes due to size problems */
882         if (tt_diff_entries_count > 0) {
883                 /* if kmalloc() fails we will reply with the full table
884                  * instead of providing the diff
885                  */
886                 bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
887                 if (bat_priv->tt.last_changeset) {
888                         memcpy(bat_priv->tt.last_changeset,
889                                tt_change, tt_change_len);
890                         bat_priv->tt.last_changeset_len = tt_diff_len;
891                 }
892         }
893         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
894 
895 container_register:
896         batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
897                                        tvlv_len);
898         kfree(tt_data);
899 }
900 
901 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
902 {
903         struct net_device *net_dev = (struct net_device *)seq->private;
904         struct batadv_priv *bat_priv = netdev_priv(net_dev);
905         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
906         struct batadv_tt_common_entry *tt_common_entry;
907         struct batadv_tt_local_entry *tt_local;
908         struct batadv_hard_iface *primary_if;
909         struct batadv_softif_vlan *vlan;
910         struct hlist_head *head;
911         unsigned short vid;
912         uint32_t i;
913         int last_seen_secs;
914         int last_seen_msecs;
915         unsigned long last_seen_jiffies;
916         bool no_purge;
917         uint16_t np_flag = BATADV_TT_CLIENT_NOPURGE;
918 
919         primary_if = batadv_seq_print_text_primary_if_get(seq);
920         if (!primary_if)
921                 goto out;
922 
923         seq_printf(seq,
924                    "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
925                    net_dev->name, (uint8_t)atomic_read(&bat_priv->tt.vn));
926         seq_printf(seq, "       %-13s  %s %-8s %-9s (%-10s)\n", "Client", "VID",
927                    "Flags", "Last seen", "CRC");
928 
929         for (i = 0; i < hash->size; i++) {
930                 head = &hash->table[i];
931 
932                 rcu_read_lock();
933                 hlist_for_each_entry_rcu(tt_common_entry,
934                                          head, hash_entry) {
935                         tt_local = container_of(tt_common_entry,
936                                                 struct batadv_tt_local_entry,
937                                                 common);
938                         vid = tt_common_entry->vid;
939                         last_seen_jiffies = jiffies - tt_local->last_seen;
940                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
941                         last_seen_secs = last_seen_msecs / 1000;
942                         last_seen_msecs = last_seen_msecs % 1000;
943 
944                         no_purge = tt_common_entry->flags & np_flag;
945 
946                         vlan = batadv_softif_vlan_get(bat_priv, vid);
947                         if (!vlan) {
948                                 seq_printf(seq, "Cannot retrieve VLAN %d\n",
949                                            BATADV_PRINT_VID(vid));
950                                 continue;
951                         }
952 
953                         seq_printf(seq,
954                                    " * %pM %4i [%c%c%c%c%c%c] %3u.%03u   (%#.8x)\n",
955                                    tt_common_entry->addr,
956                                    BATADV_PRINT_VID(tt_common_entry->vid),
957                                    (tt_common_entry->flags &
958                                     BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
959                                    no_purge ? 'P' : '.',
960                                    (tt_common_entry->flags &
961                                     BATADV_TT_CLIENT_NEW ? 'N' : '.'),
962                                    (tt_common_entry->flags &
963                                     BATADV_TT_CLIENT_PENDING ? 'X' : '.'),
964                                    (tt_common_entry->flags &
965                                     BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
966                                    (tt_common_entry->flags &
967                                     BATADV_TT_CLIENT_ISOLA ? 'I' : '.'),
968                                    no_purge ? 0 : last_seen_secs,
969                                    no_purge ? 0 : last_seen_msecs,
970                                    vlan->tt.crc);
971 
972                         batadv_softif_vlan_free_ref(vlan);
973                 }
974                 rcu_read_unlock();
975         }
976 out:
977         if (primary_if)
978                 batadv_hardif_free_ref(primary_if);
979         return 0;
980 }
981 
982 static void
983 batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
984                             struct batadv_tt_local_entry *tt_local_entry,
985                             uint16_t flags, const char *message)
986 {
987         batadv_tt_local_event(bat_priv, tt_local_entry, flags);
988 
989         /* The local client has to be marked as "pending to be removed" but has
990          * to be kept in the table in order to send it in a full table
991          * response issued before the net ttvn increment (consistency check)
992          */
993         tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
994 
995         batadv_dbg(BATADV_DBG_TT, bat_priv,
996                    "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
997                    tt_local_entry->common.addr,
998                    BATADV_PRINT_VID(tt_local_entry->common.vid), message);
999 }
1000 
1001 /**
1002  * batadv_tt_local_remove - logically remove an entry from the local table
1003  * @bat_priv: the bat priv with all the soft interface information
1004  * @addr: the MAC address of the client to remove
1005  * @vid: VLAN identifier
1006  * @message: message to append to the log on deletion
1007  * @roaming: true if the deletion is due to a roaming event
1008  *
1009  * Returns the flags assigned to the local entry before being deleted
1010  */
1011 uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv,
1012                                 const uint8_t *addr, unsigned short vid,
1013                                 const char *message, bool roaming)
1014 {
1015         struct batadv_tt_local_entry *tt_local_entry;
1016         uint16_t flags, curr_flags = BATADV_NO_FLAGS;
1017         struct batadv_softif_vlan *vlan;
1018 
1019         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
1020         if (!tt_local_entry)
1021                 goto out;
1022 
1023         curr_flags = tt_local_entry->common.flags;
1024 
1025         flags = BATADV_TT_CLIENT_DEL;
1026         /* if this global entry addition is due to a roaming, the node has to
1027          * mark the local entry as "roamed" in order to correctly reroute
1028          * packets later
1029          */
1030         if (roaming) {
1031                 flags |= BATADV_TT_CLIENT_ROAM;
1032                 /* mark the local client as ROAMed */
1033                 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1034         }
1035 
1036         if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
1037                 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
1038                                             message);
1039                 goto out;
1040         }
1041         /* if this client has been added right now, it is possible to
1042          * immediately purge it
1043          */
1044         batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL);
1045         hlist_del_rcu(&tt_local_entry->common.hash_entry);
1046         batadv_tt_local_entry_free_ref(tt_local_entry);
1047 
1048         /* decrease the reference held for this vlan */
1049         vlan = batadv_softif_vlan_get(bat_priv, vid);
1050         batadv_softif_vlan_free_ref(vlan);
1051         batadv_softif_vlan_free_ref(vlan);
1052 
1053 out:
1054         if (tt_local_entry)
1055                 batadv_tt_local_entry_free_ref(tt_local_entry);
1056 
1057         return curr_flags;
1058 }
1059 
1060 /**
1061  * batadv_tt_local_purge_list - purge inactive tt local entries
1062  * @bat_priv: the bat priv with all the soft interface information
1063  * @head: pointer to the list containing the local tt entries
1064  * @timeout: parameter deciding whether a given tt local entry is considered
1065  *  inactive or not
1066  */
1067 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
1068                                        struct hlist_head *head,
1069                                        int timeout)
1070 {
1071         struct batadv_tt_local_entry *tt_local_entry;
1072         struct batadv_tt_common_entry *tt_common_entry;
1073         struct hlist_node *node_tmp;
1074 
1075         hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
1076                                   hash_entry) {
1077                 tt_local_entry = container_of(tt_common_entry,
1078                                               struct batadv_tt_local_entry,
1079                                               common);
1080                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
1081                         continue;
1082 
1083                 /* entry already marked for deletion */
1084                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
1085                         continue;
1086 
1087                 if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout))
1088                         continue;
1089 
1090                 batadv_tt_local_set_pending(bat_priv, tt_local_entry,
1091                                             BATADV_TT_CLIENT_DEL, "timed out");
1092         }
1093 }
1094 
1095 /**
1096  * batadv_tt_local_purge - purge inactive tt local entries
1097  * @bat_priv: the bat priv with all the soft interface information
1098  * @timeout: parameter deciding whether a given tt local entry is considered
1099  *  inactive or not
1100  */
1101 static void batadv_tt_local_purge(struct batadv_priv *bat_priv,
1102                                   int timeout)
1103 {
1104         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1105         struct hlist_head *head;
1106         spinlock_t *list_lock; /* protects write access to the hash lists */
1107         uint32_t i;
1108 
1109         for (i = 0; i < hash->size; i++) {
1110                 head = &hash->table[i];
1111                 list_lock = &hash->list_locks[i];
1112 
1113                 spin_lock_bh(list_lock);
1114                 batadv_tt_local_purge_list(bat_priv, head, timeout);
1115                 spin_unlock_bh(list_lock);
1116         }
1117 }
1118 
1119 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
1120 {
1121         struct batadv_hashtable *hash;
1122         spinlock_t *list_lock; /* protects write access to the hash lists */
1123         struct batadv_tt_common_entry *tt_common_entry;
1124         struct batadv_tt_local_entry *tt_local;
1125         struct batadv_softif_vlan *vlan;
1126         struct hlist_node *node_tmp;
1127         struct hlist_head *head;
1128         uint32_t i;
1129 
1130         if (!bat_priv->tt.local_hash)
1131                 return;
1132 
1133         hash = bat_priv->tt.local_hash;
1134 
1135         for (i = 0; i < hash->size; i++) {
1136                 head = &hash->table[i];
1137                 list_lock = &hash->list_locks[i];
1138 
1139                 spin_lock_bh(list_lock);
1140                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1141                                           head, hash_entry) {
1142                         hlist_del_rcu(&tt_common_entry->hash_entry);
1143                         tt_local = container_of(tt_common_entry,
1144                                                 struct batadv_tt_local_entry,
1145                                                 common);
1146 
1147                         /* decrease the reference held for this vlan */
1148                         vlan = batadv_softif_vlan_get(bat_priv,
1149                                                       tt_common_entry->vid);
1150                         batadv_softif_vlan_free_ref(vlan);
1151                         batadv_softif_vlan_free_ref(vlan);
1152 
1153                         batadv_tt_local_entry_free_ref(tt_local);
1154                 }
1155                 spin_unlock_bh(list_lock);
1156         }
1157 
1158         batadv_hash_destroy(hash);
1159 
1160         bat_priv->tt.local_hash = NULL;
1161 }
1162 
1163 static int batadv_tt_global_init(struct batadv_priv *bat_priv)
1164 {
1165         if (bat_priv->tt.global_hash)
1166                 return 0;
1167 
1168         bat_priv->tt.global_hash = batadv_hash_new(1024);
1169 
1170         if (!bat_priv->tt.global_hash)
1171                 return -ENOMEM;
1172 
1173         batadv_hash_set_lock_class(bat_priv->tt.global_hash,
1174                                    &batadv_tt_global_hash_lock_class_key);
1175 
1176         return 0;
1177 }
1178 
1179 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
1180 {
1181         struct batadv_tt_change_node *entry, *safe;
1182 
1183         spin_lock_bh(&bat_priv->tt.changes_list_lock);
1184 
1185         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1186                                  list) {
1187                 list_del(&entry->list);
1188                 kfree(entry);
1189         }
1190 
1191         atomic_set(&bat_priv->tt.local_changes, 0);
1192         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1193 }
1194 
1195 /* retrieves the orig_tt_list_entry belonging to orig_node from the
1196  * batadv_tt_global_entry list
1197  *
1198  * returns it with an increased refcounter, NULL if not found
1199  */
1200 static struct batadv_tt_orig_list_entry *
1201 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
1202                                  const struct batadv_orig_node *orig_node)
1203 {
1204         struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
1205         const struct hlist_head *head;
1206 
1207         rcu_read_lock();
1208         head = &entry->orig_list;
1209         hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
1210                 if (tmp_orig_entry->orig_node != orig_node)
1211                         continue;
1212                 if (!atomic_inc_not_zero(&tmp_orig_entry->refcount))
1213                         continue;
1214 
1215                 orig_entry = tmp_orig_entry;
1216                 break;
1217         }
1218         rcu_read_unlock();
1219 
1220         return orig_entry;
1221 }
1222 
1223 /* find out if an orig_node is already in the list of a tt_global_entry.
1224  * returns true if found, false otherwise
1225  */
1226 static bool
1227 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
1228                                 const struct batadv_orig_node *orig_node)
1229 {
1230         struct batadv_tt_orig_list_entry *orig_entry;
1231         bool found = false;
1232 
1233         orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
1234         if (orig_entry) {
1235                 found = true;
1236                 batadv_tt_orig_list_entry_free_ref(orig_entry);
1237         }
1238 
1239         return found;
1240 }
1241 
1242 static void
1243 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
1244                                 struct batadv_orig_node *orig_node, int ttvn)
1245 {
1246         struct batadv_tt_orig_list_entry *orig_entry;
1247 
1248         orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
1249         if (orig_entry) {
1250                 /* refresh the ttvn: the current value could be a bogus one that
1251                  * was added during a "temporary client detection"
1252                  */
1253                 orig_entry->ttvn = ttvn;
1254                 goto out;
1255         }
1256 
1257         orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
1258         if (!orig_entry)
1259                 goto out;
1260 
1261         INIT_HLIST_NODE(&orig_entry->list);
1262         atomic_inc(&orig_node->refcount);
1263         batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
1264         orig_entry->orig_node = orig_node;
1265         orig_entry->ttvn = ttvn;
1266         atomic_set(&orig_entry->refcount, 2);
1267 
1268         spin_lock_bh(&tt_global->list_lock);
1269         hlist_add_head_rcu(&orig_entry->list,
1270                            &tt_global->orig_list);
1271         spin_unlock_bh(&tt_global->list_lock);
1272         atomic_inc(&tt_global->orig_list_count);
1273 
1274 out:
1275         if (orig_entry)
1276                 batadv_tt_orig_list_entry_free_ref(orig_entry);
1277 }
1278 
1279 /**
1280  * batadv_tt_global_add - add a new TT global entry or update an existing one
1281  * @bat_priv: the bat priv with all the soft interface information
1282  * @orig_node: the originator announcing the client
1283  * @tt_addr: the mac address of the non-mesh client
1284  * @vid: VLAN identifier
1285  * @flags: TT flags that have to be set for this non-mesh client
1286  * @ttvn: the tt version number ever announcing this non-mesh client
1287  *
1288  * Add a new TT global entry for the given originator. If the entry already
1289  * exists add a new reference to the given originator (a global entry can have
1290  * references to multiple originators) and adjust the flags attribute to reflect
1291  * the function argument.
1292  * If a TT local entry exists for this non-mesh client remove it.
1293  *
1294  * The caller must hold orig_node refcount.
1295  *
1296  * Return true if the new entry has been added, false otherwise
1297  */
1298 static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
1299                                  struct batadv_orig_node *orig_node,
1300                                  const unsigned char *tt_addr,
1301                                  unsigned short vid, uint16_t flags,
1302                                  uint8_t ttvn)
1303 {
1304         struct batadv_tt_global_entry *tt_global_entry;
1305         struct batadv_tt_local_entry *tt_local_entry;
1306         bool ret = false;
1307         int hash_added;
1308         struct batadv_tt_common_entry *common;
1309         uint16_t local_flags;
1310 
1311         /* ignore global entries from backbone nodes */
1312         if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
1313                 return true;
1314 
1315         tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
1316         tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
1317 
1318         /* if the node already has a local client for this entry, it has to wait
1319          * for a roaming advertisement instead of manually messing up the global
1320          * table
1321          */
1322         if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
1323             !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
1324                 goto out;
1325 
1326         if (!tt_global_entry) {
1327                 tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
1328                 if (!tt_global_entry)
1329                         goto out;
1330 
1331                 common = &tt_global_entry->common;
1332                 ether_addr_copy(common->addr, tt_addr);
1333                 common->vid = vid;
1334 
1335                 common->flags = flags;
1336                 tt_global_entry->roam_at = 0;
1337                 /* node must store current time in case of roaming. This is
1338                  * needed to purge this entry out on timeout (if nobody claims
1339                  * it)
1340                  */
1341                 if (flags & BATADV_TT_CLIENT_ROAM)
1342                         tt_global_entry->roam_at = jiffies;
1343                 atomic_set(&common->refcount, 2);
1344                 common->added_at = jiffies;
1345 
1346                 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
1347                 atomic_set(&tt_global_entry->orig_list_count, 0);
1348                 spin_lock_init(&tt_global_entry->list_lock);
1349 
1350                 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
1351                                              batadv_compare_tt,
1352                                              batadv_choose_tt, common,
1353                                              &common->hash_entry);
1354 
1355                 if (unlikely(hash_added != 0)) {
1356                         /* remove the reference for the hash */
1357                         batadv_tt_global_entry_free_ref(tt_global_entry);
1358                         goto out_remove;
1359                 }
1360         } else {
1361                 common = &tt_global_entry->common;
1362                 /* If there is already a global entry, we can use this one for
1363                  * our processing.
1364                  * But if we are trying to add a temporary client then here are
1365                  * two options at this point:
1366                  * 1) the global client is not a temporary client: the global
1367                  *    client has to be left as it is, temporary information
1368                  *    should never override any already known client state
1369                  * 2) the global client is a temporary client: purge the
1370                  *    originator list and add the new one orig_entry
1371                  */
1372                 if (flags & BATADV_TT_CLIENT_TEMP) {
1373                         if (!(common->flags & BATADV_TT_CLIENT_TEMP))
1374                                 goto out;
1375                         if (batadv_tt_global_entry_has_orig(tt_global_entry,
1376                                                             orig_node))
1377                                 goto out_remove;
1378                         batadv_tt_global_del_orig_list(tt_global_entry);
1379                         goto add_orig_entry;
1380                 }
1381 
1382                 /* if the client was temporary added before receiving the first
1383                  * OGM announcing it, we have to clear the TEMP flag
1384                  */
1385                 common->flags &= ~BATADV_TT_CLIENT_TEMP;
1386 
1387                 /* the change can carry possible "attribute" flags like the
1388                  * TT_CLIENT_WIFI, therefore they have to be copied in the
1389                  * client entry
1390                  */
1391                 tt_global_entry->common.flags |= flags;
1392 
1393                 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1394                  * one originator left in the list and we previously received a
1395                  * delete + roaming change for this originator.
1396                  *
1397                  * We should first delete the old originator before adding the
1398                  * new one.
1399                  */
1400                 if (common->flags & BATADV_TT_CLIENT_ROAM) {
1401                         batadv_tt_global_del_orig_list(tt_global_entry);
1402                         common->flags &= ~BATADV_TT_CLIENT_ROAM;
1403                         tt_global_entry->roam_at = 0;
1404                 }
1405         }
1406 add_orig_entry:
1407         /* add the new orig_entry (if needed) or update it */
1408         batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);
1409 
1410         batadv_dbg(BATADV_DBG_TT, bat_priv,
1411                    "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1412                    common->addr, BATADV_PRINT_VID(common->vid),
1413                    orig_node->orig);
1414         ret = true;
1415 
1416 out_remove:
1417         /* Do not remove multicast addresses from the local hash on
1418          * global additions
1419          */
1420         if (is_multicast_ether_addr(tt_addr))
1421                 goto out;
1422 
1423         /* remove address from local hash if present */
1424         local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
1425                                              "global tt received",
1426                                              flags & BATADV_TT_CLIENT_ROAM);
1427         tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
1428 
1429         if (!(flags & BATADV_TT_CLIENT_ROAM))
1430                 /* this is a normal global add. Therefore the client is not in a
1431                  * roaming state anymore.
1432                  */
1433                 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
1434 
1435 out:
1436         if (tt_global_entry)
1437                 batadv_tt_global_entry_free_ref(tt_global_entry);
1438         if (tt_local_entry)
1439                 batadv_tt_local_entry_free_ref(tt_local_entry);
1440         return ret;
1441 }
1442 
1443 /**
1444  * batadv_transtable_best_orig - Get best originator list entry from tt entry
1445  * @bat_priv: the bat priv with all the soft interface information
1446  * @tt_global_entry: global translation table entry to be analyzed
1447  *
1448  * This functon assumes the caller holds rcu_read_lock().
1449  * Returns best originator list entry or NULL on errors.
1450  */
1451 static struct batadv_tt_orig_list_entry *
1452 batadv_transtable_best_orig(struct batadv_priv *bat_priv,
1453                             struct batadv_tt_global_entry *tt_global_entry)
1454 {
1455         struct batadv_neigh_node *router, *best_router = NULL;
1456         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1457         struct hlist_head *head;
1458         struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
1459 
1460         head = &tt_global_entry->orig_list;
1461         hlist_for_each_entry_rcu(orig_entry, head, list) {
1462                 router = batadv_orig_router_get(orig_entry->orig_node,
1463                                                 BATADV_IF_DEFAULT);
1464                 if (!router)
1465                         continue;
1466 
1467                 if (best_router &&
1468                     bao->bat_neigh_cmp(router, BATADV_IF_DEFAULT,
1469                                        best_router, BATADV_IF_DEFAULT) <= 0) {
1470                         batadv_neigh_node_free_ref(router);
1471                         continue;
1472                 }
1473 
1474                 /* release the refcount for the "old" best */
1475                 if (best_router)
1476                         batadv_neigh_node_free_ref(best_router);
1477 
1478                 best_entry = orig_entry;
1479                 best_router = router;
1480         }
1481 
1482         if (best_router)
1483                 batadv_neigh_node_free_ref(best_router);
1484 
1485         return best_entry;
1486 }
1487 
1488 /**
1489  * batadv_tt_global_print_entry - print all orig nodes who announce the address
1490  *  for this global entry
1491  * @bat_priv: the bat priv with all the soft interface information
1492  * @tt_global_entry: global translation table entry to be printed
1493  * @seq: debugfs table seq_file struct
1494  *
1495  * This functon assumes the caller holds rcu_read_lock().
1496  */
1497 static void
1498 batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
1499                              struct batadv_tt_global_entry *tt_global_entry,
1500                              struct seq_file *seq)
1501 {
1502         struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
1503         struct batadv_tt_common_entry *tt_common_entry;
1504         struct batadv_orig_node_vlan *vlan;
1505         struct hlist_head *head;
1506         uint8_t last_ttvn;
1507         uint16_t flags;
1508 
1509         tt_common_entry = &tt_global_entry->common;
1510         flags = tt_common_entry->flags;
1511 
1512         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1513         if (best_entry) {
1514                 vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
1515                                                  tt_common_entry->vid);
1516                 if (!vlan) {
1517                         seq_printf(seq,
1518                                    " * Cannot retrieve VLAN %d for originator %pM\n",
1519                                    BATADV_PRINT_VID(tt_common_entry->vid),
1520                                    best_entry->orig_node->orig);
1521                         goto print_list;
1522                 }
1523 
1524                 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
1525                 seq_printf(seq,
1526                            " %c %pM %4i   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1527                            '*', tt_global_entry->common.addr,
1528                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1529                            best_entry->ttvn, best_entry->orig_node->orig,
1530                            last_ttvn, vlan->tt.crc,
1531                            (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
1532                            (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
1533                            (flags & BATADV_TT_CLIENT_ISOLA ? 'I' : '.'),
1534                            (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.'));
1535 
1536                 batadv_orig_node_vlan_free_ref(vlan);
1537         }
1538 
1539 print_list:
1540         head = &tt_global_entry->orig_list;
1541 
1542         hlist_for_each_entry_rcu(orig_entry, head, list) {
1543                 if (best_entry == orig_entry)
1544                         continue;
1545 
1546                 vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
1547                                                  tt_common_entry->vid);
1548                 if (!vlan) {
1549                         seq_printf(seq,
1550                                    " + Cannot retrieve VLAN %d for originator %pM\n",
1551                                    BATADV_PRINT_VID(tt_common_entry->vid),
1552                                    orig_entry->orig_node->orig);
1553                         continue;
1554                 }
1555 
1556                 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
1557                 seq_printf(seq,
1558                            " %c %pM %4d   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1559                            '+', tt_global_entry->common.addr,
1560                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1561                            orig_entry->ttvn, orig_entry->orig_node->orig,
1562                            last_ttvn, vlan->tt.crc,
1563                            (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
1564                            (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
1565                            (flags & BATADV_TT_CLIENT_ISOLA ? 'I' : '.'),
1566                            (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.'));
1567 
1568                 batadv_orig_node_vlan_free_ref(vlan);
1569         }
1570 }
1571 
1572 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
1573 {
1574         struct net_device *net_dev = (struct net_device *)seq->private;
1575         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1576         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1577         struct batadv_tt_common_entry *tt_common_entry;
1578         struct batadv_tt_global_entry *tt_global;
1579         struct batadv_hard_iface *primary_if;
1580         struct hlist_head *head;
1581         uint32_t i;
1582 
1583         primary_if = batadv_seq_print_text_primary_if_get(seq);
1584         if (!primary_if)
1585                 goto out;
1586 
1587         seq_printf(seq,
1588                    "Globally announced TT entries received via the mesh %s\n",
1589                    net_dev->name);
1590         seq_printf(seq, "       %-13s  %s  %s       %-15s %s (%-10s) %s\n",
1591                    "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1592                    "CRC", "Flags");
1593 
1594         for (i = 0; i < hash->size; i++) {
1595                 head = &hash->table[i];
1596 
1597                 rcu_read_lock();
1598                 hlist_for_each_entry_rcu(tt_common_entry,
1599                                          head, hash_entry) {
1600                         tt_global = container_of(tt_common_entry,
1601                                                  struct batadv_tt_global_entry,
1602                                                  common);
1603                         batadv_tt_global_print_entry(bat_priv, tt_global, seq);
1604                 }
1605                 rcu_read_unlock();
1606         }
1607 out:
1608         if (primary_if)
1609                 batadv_hardif_free_ref(primary_if);
1610         return 0;
1611 }
1612 
1613 /**
1614  * batadv_tt_global_del_orig_entry - remove and free an orig_entry
1615  * @tt_global_entry: the global entry to remove the orig_entry from
1616  * @orig_entry: the orig entry to remove and free
1617  *
1618  * Remove an orig_entry from its list in the given tt_global_entry and
1619  * free this orig_entry afterwards.
1620  */
1621 static void
1622 batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
1623                                 struct batadv_tt_orig_list_entry *orig_entry)
1624 {
1625         batadv_tt_global_size_dec(orig_entry->orig_node,
1626                                   tt_global_entry->common.vid);
1627         atomic_dec(&tt_global_entry->orig_list_count);
1628         hlist_del_rcu(&orig_entry->list);
1629         batadv_tt_orig_list_entry_free_ref(orig_entry);
1630 }
1631 
1632 /* deletes the orig list of a tt_global_entry */
1633 static void
1634 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
1635 {
1636         struct hlist_head *head;
1637         struct hlist_node *safe;
1638         struct batadv_tt_orig_list_entry *orig_entry;
1639 
1640         spin_lock_bh(&tt_global_entry->list_lock);
1641         head = &tt_global_entry->orig_list;
1642         hlist_for_each_entry_safe(orig_entry, safe, head, list)
1643                 batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
1644         spin_unlock_bh(&tt_global_entry->list_lock);
1645 }
1646 
1647 /**
1648  * batadv_tt_global_del_orig_node - remove orig_node from a global tt entry
1649  * @bat_priv: the bat priv with all the soft interface information
1650  * @tt_global_entry: the global entry to remove the orig_node from
1651  * @orig_node: the originator announcing the client
1652  * @message: message to append to the log on deletion
1653  *
1654  * Remove the given orig_node and its according orig_entry from the given
1655  * global tt entry.
1656  */
1657 static void
1658 batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
1659                                struct batadv_tt_global_entry *tt_global_entry,
1660                                struct batadv_orig_node *orig_node,
1661                                const char *message)
1662 {
1663         struct hlist_head *head;
1664         struct hlist_node *safe;
1665         struct batadv_tt_orig_list_entry *orig_entry;
1666         unsigned short vid;
1667 
1668         spin_lock_bh(&tt_global_entry->list_lock);
1669         head = &tt_global_entry->orig_list;
1670         hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1671                 if (orig_entry->orig_node == orig_node) {
1672                         vid = tt_global_entry->common.vid;
1673                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1674                                    "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1675                                    orig_node->orig,
1676                                    tt_global_entry->common.addr,
1677                                    BATADV_PRINT_VID(vid), message);
1678                         batadv_tt_global_del_orig_entry(tt_global_entry,
1679                                                         orig_entry);
1680                 }
1681         }
1682         spin_unlock_bh(&tt_global_entry->list_lock);
1683 }
1684 
1685 /* If the client is to be deleted, we check if it is the last origantor entry
1686  * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1687  * timer, otherwise we simply remove the originator scheduled for deletion.
1688  */
1689 static void
1690 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
1691                              struct batadv_tt_global_entry *tt_global_entry,
1692                              struct batadv_orig_node *orig_node,
1693                              const char *message)
1694 {
1695         bool last_entry = true;
1696         struct hlist_head *head;
1697         struct batadv_tt_orig_list_entry *orig_entry;
1698 
1699         /* no local entry exists, case 1:
1700          * Check if this is the last one or if other entries exist.
1701          */
1702 
1703         rcu_read_lock();
1704         head = &tt_global_entry->orig_list;
1705         hlist_for_each_entry_rcu(orig_entry, head, list) {
1706                 if (orig_entry->orig_node != orig_node) {
1707                         last_entry = false;
1708                         break;
1709                 }
1710         }
1711         rcu_read_unlock();
1712 
1713         if (last_entry) {
1714                 /* its the last one, mark for roaming. */
1715                 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1716                 tt_global_entry->roam_at = jiffies;
1717         } else
1718                 /* there is another entry, we can simply delete this
1719                  * one and can still use the other one.
1720                  */
1721                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
1722                                                orig_node, message);
1723 }
1724 
1725 /**
1726  * batadv_tt_global_del - remove a client from the global table
1727  * @bat_priv: the bat priv with all the soft interface information
1728  * @orig_node: an originator serving this client
1729  * @addr: the mac address of the client
1730  * @vid: VLAN identifier
1731  * @message: a message explaining the reason for deleting the client to print
1732  *  for debugging purpose
1733  * @roaming: true if the deletion has been triggered by a roaming event
1734  */
1735 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
1736                                  struct batadv_orig_node *orig_node,
1737                                  const unsigned char *addr, unsigned short vid,
1738                                  const char *message, bool roaming)
1739 {
1740         struct batadv_tt_global_entry *tt_global_entry;
1741         struct batadv_tt_local_entry *local_entry = NULL;
1742 
1743         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1744         if (!tt_global_entry)
1745                 goto out;
1746 
1747         if (!roaming) {
1748                 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
1749                                                orig_node, message);
1750 
1751                 if (hlist_empty(&tt_global_entry->orig_list))
1752                         batadv_tt_global_free(bat_priv, tt_global_entry,
1753                                               message);
1754 
1755                 goto out;
1756         }
1757 
1758         /* if we are deleting a global entry due to a roam
1759          * event, there are two possibilities:
1760          * 1) the client roamed from node A to node B => if there
1761          *    is only one originator left for this client, we mark
1762          *    it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1763          *    wait for node B to claim it. In case of timeout
1764          *    the entry is purged.
1765          *
1766          *    If there are other originators left, we directly delete
1767          *    the originator.
1768          * 2) the client roamed to us => we can directly delete
1769          *    the global entry, since it is useless now.
1770          */
1771         local_entry = batadv_tt_local_hash_find(bat_priv,
1772                                                 tt_global_entry->common.addr,
1773                                                 vid);
1774         if (local_entry) {
1775                 /* local entry exists, case 2: client roamed to us. */
1776                 batadv_tt_global_del_orig_list(tt_global_entry);
1777                 batadv_tt_global_free(bat_priv, tt_global_entry, message);
1778         } else
1779                 /* no local entry exists, case 1: check for roaming */
1780                 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
1781                                              orig_node, message);
1782 
1783 
1784 out:
1785         if (tt_global_entry)
1786                 batadv_tt_global_entry_free_ref(tt_global_entry);
1787         if (local_entry)
1788                 batadv_tt_local_entry_free_ref(local_entry);
1789 }
1790 
1791 /**
1792  * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1793  *  given originator matching the provided vid
1794  * @bat_priv: the bat priv with all the soft interface information
1795  * @orig_node: the originator owning the entries to remove
1796  * @match_vid: the VLAN identifier to match. If negative all the entries will be
1797  *  removed
1798  * @message: debug message to print as "reason"
1799  */
1800 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
1801                                struct batadv_orig_node *orig_node,
1802                                int32_t match_vid,
1803                                const char *message)
1804 {
1805         struct batadv_tt_global_entry *tt_global;
1806         struct batadv_tt_common_entry *tt_common_entry;
1807         uint32_t i;
1808         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1809         struct hlist_node *safe;
1810         struct hlist_head *head;
1811         spinlock_t *list_lock; /* protects write access to the hash lists */
1812         unsigned short vid;
1813 
1814         if (!hash)
1815                 return;
1816 
1817         for (i = 0; i < hash->size; i++) {
1818                 head = &hash->table[i];
1819                 list_lock = &hash->list_locks[i];
1820 
1821                 spin_lock_bh(list_lock);
1822                 hlist_for_each_entry_safe(tt_common_entry, safe,
1823                                           head, hash_entry) {
1824                         /* remove only matching entries */
1825                         if (match_vid >= 0 && tt_common_entry->vid != match_vid)
1826                                 continue;
1827 
1828                         tt_global = container_of(tt_common_entry,
1829                                                  struct batadv_tt_global_entry,
1830                                                  common);
1831 
1832                         batadv_tt_global_del_orig_node(bat_priv, tt_global,
1833                                                        orig_node, message);
1834 
1835                         if (hlist_empty(&tt_global->orig_list)) {
1836                                 vid = tt_global->common.vid;
1837                                 batadv_dbg(BATADV_DBG_TT, bat_priv,
1838                                            "Deleting global tt entry %pM (vid: %d): %s\n",
1839                                            tt_global->common.addr,
1840                                            BATADV_PRINT_VID(vid), message);
1841                                 hlist_del_rcu(&tt_common_entry->hash_entry);
1842                                 batadv_tt_global_entry_free_ref(tt_global);
1843                         }
1844                 }
1845                 spin_unlock_bh(list_lock);
1846         }
1847         orig_node->capa_initialized &= ~BATADV_ORIG_CAPA_HAS_TT;
1848 }
1849 
1850 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
1851                                       char **msg)
1852 {
1853         bool purge = false;
1854         unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
1855         unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
1856 
1857         if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
1858             batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
1859                 purge = true;
1860                 *msg = "Roaming timeout\n";
1861         }
1862 
1863         if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
1864             batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
1865                 purge = true;
1866                 *msg = "Temporary client timeout\n";
1867         }
1868 
1869         return purge;
1870 }
1871 
1872 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
1873 {
1874         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1875         struct hlist_head *head;
1876         struct hlist_node *node_tmp;
1877         spinlock_t *list_lock; /* protects write access to the hash lists */
1878         uint32_t i;
1879         char *msg = NULL;
1880         struct batadv_tt_common_entry *tt_common;
1881         struct batadv_tt_global_entry *tt_global;
1882 
1883         for (i = 0; i < hash->size; i++) {
1884                 head = &hash->table[i];
1885                 list_lock = &hash->list_locks[i];
1886 
1887                 spin_lock_bh(list_lock);
1888                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
1889                                           hash_entry) {
1890                         tt_global = container_of(tt_common,
1891                                                  struct batadv_tt_global_entry,
1892                                                  common);
1893 
1894                         if (!batadv_tt_global_to_purge(tt_global, &msg))
1895                                 continue;
1896 
1897                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1898                                    "Deleting global tt entry %pM (vid: %d): %s\n",
1899                                    tt_global->common.addr,
1900                                    BATADV_PRINT_VID(tt_global->common.vid),
1901                                    msg);
1902 
1903                         hlist_del_rcu(&tt_common->hash_entry);
1904 
1905                         batadv_tt_global_entry_free_ref(tt_global);
1906                 }
1907                 spin_unlock_bh(list_lock);
1908         }
1909 }
1910 
1911 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
1912 {
1913         struct batadv_hashtable *hash;
1914         spinlock_t *list_lock; /* protects write access to the hash lists */
1915         struct batadv_tt_common_entry *tt_common_entry;
1916         struct batadv_tt_global_entry *tt_global;
1917         struct hlist_node *node_tmp;
1918         struct hlist_head *head;
1919         uint32_t i;
1920 
1921         if (!bat_priv->tt.global_hash)
1922                 return;
1923 
1924         hash = bat_priv->tt.global_hash;
1925 
1926         for (i = 0; i < hash->size; i++) {
1927                 head = &hash->table[i];
1928                 list_lock = &hash->list_locks[i];
1929 
1930                 spin_lock_bh(list_lock);
1931                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1932                                           head, hash_entry) {
1933                         hlist_del_rcu(&tt_common_entry->hash_entry);
1934                         tt_global = container_of(tt_common_entry,
1935                                                  struct batadv_tt_global_entry,
1936                                                  common);
1937                         batadv_tt_global_entry_free_ref(tt_global);
1938                 }
1939                 spin_unlock_bh(list_lock);
1940         }
1941 
1942         batadv_hash_destroy(hash);
1943 
1944         bat_priv->tt.global_hash = NULL;
1945 }
1946 
1947 static bool
1948 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
1949                        struct batadv_tt_global_entry *tt_global_entry)
1950 {
1951         bool ret = false;
1952 
1953         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
1954             tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
1955                 ret = true;
1956 
1957         /* check if the two clients are marked as isolated */
1958         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
1959             tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
1960                 ret = true;
1961 
1962         return ret;
1963 }
1964 
1965 /**
1966  * batadv_transtable_search - get the mesh destination for a given client
1967  * @bat_priv: the bat priv with all the soft interface information
1968  * @src: mac address of the source client
1969  * @addr: mac address of the destination client
1970  * @vid: VLAN identifier
1971  *
1972  * Returns a pointer to the originator that was selected as destination in the
1973  * mesh for contacting the client 'addr', NULL otherwise.
1974  * In case of multiple originators serving the same client, the function returns
1975  * the best one (best in terms of metric towards the destination node).
1976  *
1977  * If the two clients are AP isolated the function returns NULL.
1978  */
1979 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
1980                                                   const uint8_t *src,
1981                                                   const uint8_t *addr,
1982                                                   unsigned short vid)
1983 {
1984         struct batadv_tt_local_entry *tt_local_entry = NULL;
1985         struct batadv_tt_global_entry *tt_global_entry = NULL;
1986         struct batadv_orig_node *orig_node = NULL;
1987         struct batadv_tt_orig_list_entry *best_entry;
1988 
1989         if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) {
1990                 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
1991                 if (!tt_local_entry ||
1992                     (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
1993                         goto out;
1994         }
1995 
1996         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1997         if (!tt_global_entry)
1998                 goto out;
1999 
2000         /* check whether the clients should not communicate due to AP
2001          * isolation
2002          */
2003         if (tt_local_entry &&
2004             _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
2005                 goto out;
2006 
2007         rcu_read_lock();
2008         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
2009         /* found anything? */
2010         if (best_entry)
2011                 orig_node = best_entry->orig_node;
2012         if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
2013                 orig_node = NULL;
2014         rcu_read_unlock();
2015 
2016 out:
2017         if (tt_global_entry)
2018                 batadv_tt_global_entry_free_ref(tt_global_entry);
2019         if (tt_local_entry)
2020                 batadv_tt_local_entry_free_ref(tt_local_entry);
2021 
2022         return orig_node;
2023 }
2024 
2025 /**
2026  * batadv_tt_global_crc - calculates the checksum of the local table belonging
2027  *  to the given orig_node
2028  * @bat_priv: the bat priv with all the soft interface information
2029  * @orig_node: originator for which the CRC should be computed
2030  * @vid: VLAN identifier for which the CRC32 has to be computed
2031  *
2032  * This function computes the checksum for the global table corresponding to a
2033  * specific originator. In particular, the checksum is computed as follows: For
2034  * each client connected to the originator the CRC32C of the MAC address and the
2035  * VID is computed and then all the CRC32Cs of the various clients are xor'ed
2036  * together.
2037  *
2038  * The idea behind is that CRC32C should be used as much as possible in order to
2039  * produce a unique hash of the table, but since the order which is used to feed
2040  * the CRC32C function affects the result and since every node in the network
2041  * probably sorts the clients differently, the hash function cannot be directly
2042  * computed over the entire table. Hence the CRC32C is used only on
2043  * the single client entry, while all the results are then xor'ed together
2044  * because the XOR operation can combine them all while trying to reduce the
2045  * noise as much as possible.
2046  *
2047  * Returns the checksum of the global table of a given originator.
2048  */
2049 static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv,
2050                                      struct batadv_orig_node *orig_node,
2051                                      unsigned short vid)
2052 {
2053         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2054         struct batadv_tt_common_entry *tt_common;
2055         struct batadv_tt_global_entry *tt_global;
2056         struct hlist_head *head;
2057         uint32_t i, crc_tmp, crc = 0;
2058         uint8_t flags;
2059         __be16 tmp_vid;
2060 
2061         for (i = 0; i < hash->size; i++) {
2062                 head = &hash->table[i];
2063 
2064                 rcu_read_lock();
2065                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2066                         tt_global = container_of(tt_common,
2067                                                  struct batadv_tt_global_entry,
2068                                                  common);
2069                         /* compute the CRC only for entries belonging to the
2070                          * VLAN identified by the vid passed as parameter
2071                          */
2072                         if (tt_common->vid != vid)
2073                                 continue;
2074 
2075                         /* Roaming clients are in the global table for
2076                          * consistency only. They don't have to be
2077                          * taken into account while computing the
2078                          * global crc
2079                          */
2080                         if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
2081                                 continue;
2082                         /* Temporary clients have not been announced yet, so
2083                          * they have to be skipped while computing the global
2084                          * crc
2085                          */
2086                         if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
2087                                 continue;
2088 
2089                         /* find out if this global entry is announced by this
2090                          * originator
2091                          */
2092                         if (!batadv_tt_global_entry_has_orig(tt_global,
2093                                                              orig_node))
2094                                 continue;
2095 
2096                         /* use network order to read the VID: this ensures that
2097                          * every node reads the bytes in the same order.
2098                          */
2099                         tmp_vid = htons(tt_common->vid);
2100                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2101 
2102                         /* compute the CRC on flags that have to be kept in sync
2103                          * among nodes
2104                          */
2105                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2106                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2107 
2108                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2109                 }
2110                 rcu_read_unlock();
2111         }
2112 
2113         return crc;
2114 }
2115 
2116 /**
2117  * batadv_tt_local_crc - calculates the checksum of the local table
2118  * @bat_priv: the bat priv with all the soft interface information
2119  * @vid: VLAN identifier for which the CRC32 has to be computed
2120  *
2121  * For details about the computation, please refer to the documentation for
2122  * batadv_tt_global_crc().
2123  *
2124  * Returns the checksum of the local table
2125  */
2126 static uint32_t batadv_tt_local_crc(struct batadv_priv *bat_priv,
2127                                     unsigned short vid)
2128 {
2129         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2130         struct batadv_tt_common_entry *tt_common;
2131         struct hlist_head *head;
2132         uint32_t i, crc_tmp, crc = 0;
2133         uint8_t flags;
2134         __be16 tmp_vid;
2135 
2136         for (i = 0; i < hash->size; i++) {
2137                 head = &hash->table[i];
2138 
2139                 rcu_read_lock();
2140                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2141                         /* compute the CRC only for entries belonging to the
2142                          * VLAN identified by vid
2143                          */
2144                         if (tt_common->vid != vid)
2145                                 continue;
2146 
2147                         /* not yet committed clients have not to be taken into
2148                          * account while computing the CRC
2149                          */
2150                         if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2151                                 continue;
2152 
2153                         /* use network order to read the VID: this ensures that
2154                          * every node reads the bytes in the same order.
2155                          */
2156                         tmp_vid = htons(tt_common->vid);
2157                         crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2158 
2159                         /* compute the CRC on flags that have to be kept in sync
2160                          * among nodes
2161                          */
2162                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2163                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2164 
2165                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2166                 }
2167                 rcu_read_unlock();
2168         }
2169 
2170         return crc;
2171 }
2172 
2173 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2174 {
2175         struct batadv_tt_req_node *node, *safe;
2176 
2177         spin_lock_bh(&bat_priv->tt.req_list_lock);
2178 
2179         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2180                 list_del(&node->list);
2181                 kfree(node);
2182         }
2183 
2184         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2185 }
2186 
2187 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2188                                        struct batadv_orig_node *orig_node,
2189                                        const void *tt_buff,
2190                                        uint16_t tt_buff_len)
2191 {
2192         /* Replace the old buffer only if I received something in the
2193          * last OGM (the OGM could carry no changes)
2194          */
2195         spin_lock_bh(&orig_node->tt_buff_lock);
2196         if (tt_buff_len > 0) {
2197                 kfree(orig_node->tt_buff);
2198                 orig_node->tt_buff_len = 0;
2199                 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2200                 if (orig_node->tt_buff) {
2201                         memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2202                         orig_node->tt_buff_len = tt_buff_len;
2203                 }
2204         }
2205         spin_unlock_bh(&orig_node->tt_buff_lock);
2206 }
2207 
2208 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2209 {
2210         struct batadv_tt_req_node *node, *safe;
2211 
2212         spin_lock_bh(&bat_priv->tt.req_list_lock);
2213         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2214                 if (batadv_has_timed_out(node->issued_at,
2215                                          BATADV_TT_REQUEST_TIMEOUT)) {
2216                         list_del(&node->list);
2217                         kfree(node);
2218                 }
2219         }
2220         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2221 }
2222 
2223 /* returns the pointer to the new tt_req_node struct if no request
2224  * has already been issued for this orig_node, NULL otherwise
2225  */
2226 static struct batadv_tt_req_node *
2227 batadv_new_tt_req_node(struct batadv_priv *bat_priv,
2228                        struct batadv_orig_node *orig_node)
2229 {
2230         struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2231 
2232         spin_lock_bh(&bat_priv->tt.req_list_lock);
2233         list_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2234                 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2235                     !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2236                                           BATADV_TT_REQUEST_TIMEOUT))
2237                         goto unlock;
2238         }
2239 
2240         tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
2241         if (!tt_req_node)
2242                 goto unlock;
2243 
2244         ether_addr_copy(tt_req_node->addr, orig_node->orig);
2245         tt_req_node->issued_at = jiffies;
2246 
2247         list_add(&tt_req_node->list, &bat_priv->tt.req_list);
2248 unlock:
2249         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2250         return tt_req_node;
2251 }
2252 
2253 /**
2254  * batadv_tt_local_valid - verify that given tt entry is a valid one
2255  * @entry_ptr: to be checked local tt entry
2256  * @data_ptr: not used but definition required to satisfy the callback prototype
2257  *
2258  * Returns 1 if the entry is a valid, 0 otherwise.
2259  */
2260 static int batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
2261 {
2262         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2263 
2264         if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2265                 return 0;
2266         return 1;
2267 }
2268 
2269 static int batadv_tt_global_valid(const void *entry_ptr,
2270                                   const void *data_ptr)
2271 {
2272         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2273         const struct batadv_tt_global_entry *tt_global_entry;
2274         const struct batadv_orig_node *orig_node = data_ptr;
2275 
2276         if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2277             tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2278                 return 0;
2279 
2280         tt_global_entry = container_of(tt_common_entry,
2281                                        struct batadv_tt_global_entry,
2282                                        common);
2283 
2284         return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
2285 }
2286 
2287 /**
2288  * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2289  *  specified tt hash
2290  * @bat_priv: the bat priv with all the soft interface information
2291  * @hash: hash table containing the tt entries
2292  * @tt_len: expected tvlv tt data buffer length in number of bytes
2293  * @tvlv_buff: pointer to the buffer to fill with the TT data
2294  * @valid_cb: function to filter tt change entries
2295  * @cb_data: data passed to the filter function as argument
2296  */
2297 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2298                                     struct batadv_hashtable *hash,
2299                                     void *tvlv_buff, uint16_t tt_len,
2300                                     int (*valid_cb)(const void *, const void *),
2301                                     void *cb_data)
2302 {
2303         struct batadv_tt_common_entry *tt_common_entry;
2304         struct batadv_tvlv_tt_change *tt_change;
2305         struct hlist_head *head;
2306         uint16_t tt_tot, tt_num_entries = 0;
2307         uint32_t i;
2308 
2309         tt_tot = batadv_tt_entries(tt_len);
2310         tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
2311 
2312         rcu_read_lock();
2313         for (i = 0; i < hash->size; i++) {
2314                 head = &hash->table[i];
2315 
2316                 hlist_for_each_entry_rcu(tt_common_entry,
2317                                          head, hash_entry) {
2318                         if (tt_tot == tt_num_entries)
2319                                 break;
2320 
2321                         if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
2322                                 continue;
2323 
2324                         ether_addr_copy(tt_change->addr, tt_common_entry->addr);
2325                         tt_change->flags = tt_common_entry->flags;
2326                         tt_change->vid = htons(tt_common_entry->vid);
2327                         memset(tt_change->reserved, 0,
2328                                sizeof(tt_change->reserved));
2329 
2330                         tt_num_entries++;
2331                         tt_change++;
2332                 }
2333         }
2334         rcu_read_unlock();
2335 }
2336 
2337 /**
2338  * batadv_tt_global_check_crc - check if all the CRCs are correct
2339  * @orig_node: originator for which the CRCs have to be checked
2340  * @tt_vlan: pointer to the first tvlv VLAN entry
2341  * @num_vlan: number of tvlv VLAN entries
2342  * @create: if true, create VLAN objects if not found
2343  *
2344  * Return true if all the received CRCs match the locally stored ones, false
2345  * otherwise
2346  */
2347 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
2348                                        struct batadv_tvlv_tt_vlan_data *tt_vlan,
2349                                        uint16_t num_vlan)
2350 {
2351         struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
2352         struct batadv_orig_node_vlan *vlan;
2353         uint32_t crc;
2354         int i;
2355 
2356         /* check if each received CRC matches the locally stored one */
2357         for (i = 0; i < num_vlan; i++) {
2358                 tt_vlan_tmp = tt_vlan + i;
2359 
2360                 /* if orig_node is a backbone node for this VLAN, don't check
2361                  * the CRC as we ignore all the global entries over it
2362                  */
2363                 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
2364                                                    orig_node->orig,
2365                                                    ntohs(tt_vlan_tmp->vid)))
2366                         continue;
2367 
2368                 vlan = batadv_orig_node_vlan_get(orig_node,
2369                                                  ntohs(tt_vlan_tmp->vid));
2370                 if (!vlan)
2371                         return false;
2372 
2373                 crc = vlan->tt.crc;
2374                 batadv_orig_node_vlan_free_ref(vlan);
2375 
2376                 if (crc != ntohl(tt_vlan_tmp->crc))
2377                         return false;
2378         }
2379 
2380         return true;
2381 }
2382 
2383 /**
2384  * batadv_tt_local_update_crc - update all the local CRCs
2385  * @bat_priv: the bat priv with all the soft interface information
2386  */
2387 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
2388 {
2389         struct batadv_softif_vlan *vlan;
2390 
2391         /* recompute the global CRC for each VLAN */
2392         rcu_read_lock();
2393         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
2394                 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
2395         }
2396         rcu_read_unlock();
2397 }
2398 
2399 /**
2400  * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2401  * @bat_priv: the bat priv with all the soft interface information
2402  * @orig_node: the orig_node for which the CRCs have to be updated
2403  */
2404 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
2405                                         struct batadv_orig_node *orig_node)
2406 {
2407         struct batadv_orig_node_vlan *vlan;
2408         uint32_t crc;
2409 
2410         /* recompute the global CRC for each VLAN */
2411         rcu_read_lock();
2412         list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
2413                 /* if orig_node is a backbone node for this VLAN, don't compute
2414                  * the CRC as we ignore all the global entries over it
2415                  */
2416                 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
2417                                                    vlan->vid))
2418                         continue;
2419 
2420                 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
2421                 vlan->tt.crc = crc;
2422         }
2423         rcu_read_unlock();
2424 }
2425 
2426 /**
2427  * batadv_send_tt_request - send a TT Request message to a given node
2428  * @bat_priv: the bat priv with all the soft interface information
2429  * @dst_orig_node: the destination of the message
2430  * @ttvn: the version number that the source of the message is looking for
2431  * @tt_vlan: pointer to the first tvlv VLAN object to request
2432  * @num_vlan: number of tvlv VLAN entries
2433  * @full_table: ask for the entire translation table if true, while only for the
2434  *  last TT diff otherwise
2435  */
2436 static int batadv_send_tt_request(struct batadv_priv *bat_priv,
2437                                   struct batadv_orig_node *dst_orig_node,
2438                                   uint8_t ttvn,
2439                                   struct batadv_tvlv_tt_vlan_data *tt_vlan,
2440                                   uint16_t num_vlan, bool full_table)
2441 {
2442         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2443         struct batadv_tt_req_node *tt_req_node = NULL;
2444         struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
2445         struct batadv_hard_iface *primary_if;
2446         bool ret = false;
2447         int i, size;
2448 
2449         primary_if = batadv_primary_if_get_selected(bat_priv);
2450         if (!primary_if)
2451                 goto out;
2452 
2453         /* The new tt_req will be issued only if I'm not waiting for a
2454          * reply from the same orig_node yet
2455          */
2456         tt_req_node = batadv_new_tt_req_node(bat_priv, dst_orig_node);
2457         if (!tt_req_node)
2458                 goto out;
2459 
2460         size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
2461         tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
2462         if (!tvlv_tt_data)
2463                 goto out;
2464 
2465         tvlv_tt_data->flags = BATADV_TT_REQUEST;
2466         tvlv_tt_data->ttvn = ttvn;
2467         tvlv_tt_data->num_vlan = htons(num_vlan);
2468 
2469         /* send all the CRCs within the request. This is needed by intermediate
2470          * nodes to ensure they have the correct table before replying
2471          */
2472         tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
2473         for (i = 0; i < num_vlan; i++) {
2474                 tt_vlan_req->vid = tt_vlan->vid;
2475                 tt_vlan_req->crc = tt_vlan->crc;
2476 
2477                 tt_vlan_req++;
2478                 tt_vlan++;
2479         }
2480 
2481         if (full_table)
2482                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2483 
2484         batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
2485                    dst_orig_node->orig, full_table ? 'F' : '.');
2486 
2487         batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
2488         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2489                                  dst_orig_node->orig, BATADV_TVLV_TT, 1,
2490                                  tvlv_tt_data, size);
2491         ret = true;
2492 
2493 out:
2494         if (primary_if)
2495                 batadv_hardif_free_ref(primary_if);
2496         if (ret && tt_req_node) {
2497                 spin_lock_bh(&bat_priv->tt.req_list_lock);
2498                 list_del(&tt_req_node->list);
2499                 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2500                 kfree(tt_req_node);
2501         }
2502         kfree(tvlv_tt_data);
2503         return ret;
2504 }
2505 
2506 /**
2507  * batadv_send_other_tt_response - send reply to tt request concerning another
2508  *  node's translation table
2509  * @bat_priv: the bat priv with all the soft interface information
2510  * @tt_data: tt data containing the tt request information
2511  * @req_src: mac address of tt request sender
2512  * @req_dst: mac address of tt request recipient
2513  *
2514  * Returns true if tt request reply was sent, false otherwise.
2515  */
2516 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
2517                                           struct batadv_tvlv_tt_data *tt_data,
2518                                           uint8_t *req_src, uint8_t *req_dst)
2519 {
2520         struct batadv_orig_node *req_dst_orig_node;
2521         struct batadv_orig_node *res_dst_orig_node = NULL;
2522         struct batadv_tvlv_tt_change *tt_change;
2523         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2524         struct batadv_tvlv_tt_vlan_data *tt_vlan;
2525         bool ret = false, full_table;
2526         uint8_t orig_ttvn, req_ttvn;
2527         uint16_t tvlv_len;
2528         int32_t tt_len;
2529 
2530         batadv_dbg(BATADV_DBG_TT, bat_priv,
2531                    "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2532                    req_src, tt_data->ttvn, req_dst,
2533                    (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2534 
2535         /* Let's get the orig node of the REAL destination */
2536         req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
2537         if (!req_dst_orig_node)
2538                 goto out;
2539 
2540         res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
2541         if (!res_dst_orig_node)
2542                 goto out;
2543 
2544         orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
2545         req_ttvn = tt_data->ttvn;
2546 
2547         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
2548         /* this node doesn't have the requested data */
2549         if (orig_ttvn != req_ttvn ||
2550             !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
2551                                         ntohs(tt_data->num_vlan)))
2552                 goto out;
2553 
2554         /* If the full table has been explicitly requested */
2555         if (tt_data->flags & BATADV_TT_FULL_TABLE ||
2556             !req_dst_orig_node->tt_buff)
2557                 full_table = true;
2558         else
2559                 full_table = false;
2560 
2561         /* TT fragmentation hasn't been implemented yet, so send as many
2562          * TT entries fit a single packet as possible only
2563          */
2564         if (!full_table) {
2565                 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
2566                 tt_len = req_dst_orig_node->tt_buff_len;
2567 
2568                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2569                                                               &tvlv_tt_data,
2570                                                               &tt_change,
2571                                                               &tt_len);
2572                 if (!tt_len)
2573                         goto unlock;
2574 
2575                 /* Copy the last orig_node's OGM buffer */
2576                 memcpy(tt_change, req_dst_orig_node->tt_buff,
2577                        req_dst_orig_node->tt_buff_len);
2578                 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2579         } else {
2580                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2581                  * in the initial part
2582                  */
2583                 tt_len = -1;
2584                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2585                                                               &tvlv_tt_data,
2586                                                               &tt_change,
2587                                                               &tt_len);
2588                 if (!tt_len)
2589                         goto out;
2590 
2591                 /* fill the rest of the tvlv with the real TT entries */
2592                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
2593                                         tt_change, tt_len,
2594                                         batadv_tt_global_valid,
2595                                         req_dst_orig_node);
2596         }
2597 
2598         /* Don't send the response, if larger than fragmented packet. */
2599         tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
2600         if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
2601                 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
2602                                          "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
2603                                          res_dst_orig_node->orig);
2604                 goto out;
2605         }
2606 
2607         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2608         tvlv_tt_data->ttvn = req_ttvn;
2609 
2610         if (full_table)
2611                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2612 
2613         batadv_dbg(BATADV_DBG_TT, bat_priv,
2614                    "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2615                    res_dst_orig_node->orig, req_dst_orig_node->orig,
2616                    full_table ? 'F' : '.', req_ttvn);
2617 
2618         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2619 
2620         batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
2621                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2622                                  tvlv_len);
2623 
2624         ret = true;
2625         goto out;
2626 
2627 unlock:
2628         spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2629 
2630 out:
2631         if (res_dst_orig_node)
2632                 batadv_orig_node_free_ref(res_dst_orig_node);
2633         if (req_dst_orig_node)
2634                 batadv_orig_node_free_ref(req_dst_orig_node);
2635         kfree(tvlv_tt_data);
2636         return ret;
2637 }
2638 
2639 /**
2640  * batadv_send_my_tt_response - send reply to tt request concerning this node's
2641  *  translation table
2642  * @bat_priv: the bat priv with all the soft interface information
2643  * @tt_data: tt data containing the tt request information
2644  * @req_src: mac address of tt request sender
2645  *
2646  * Returns true if tt request reply was sent, false otherwise.
2647  */
2648 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
2649                                        struct batadv_tvlv_tt_data *tt_data,
2650                                        uint8_t *req_src)
2651 {
2652         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2653         struct batadv_hard_iface *primary_if = NULL;
2654         struct batadv_tvlv_tt_change *tt_change;
2655         struct batadv_orig_node *orig_node;
2656         uint8_t my_ttvn, req_ttvn;
2657         uint16_t tvlv_len;
2658         bool full_table;
2659         int32_t tt_len;
2660 
2661         batadv_dbg(BATADV_DBG_TT, bat_priv,
2662                    "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2663                    req_src, tt_data->ttvn,
2664                    (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2665 
2666         spin_lock_bh(&bat_priv->tt.commit_lock);
2667 
2668         my_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
2669         req_ttvn = tt_data->ttvn;
2670 
2671         orig_node = batadv_orig_hash_find(bat_priv, req_src);
2672         if (!orig_node)
2673                 goto out;
2674 
2675         primary_if = batadv_primary_if_get_selected(bat_priv);
2676         if (!primary_if)
2677                 goto out;
2678 
2679         /* If the full table has been explicitly requested or the gap
2680          * is too big send the whole local translation table
2681          */
2682         if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
2683             !bat_priv->tt.last_changeset)
2684                 full_table = true;
2685         else
2686                 full_table = false;
2687 
2688         /* TT fragmentation hasn't been implemented yet, so send as many
2689          * TT entries fit a single packet as possible only
2690          */
2691         if (!full_table) {
2692                 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
2693 
2694                 tt_len = bat_priv->tt.last_changeset_len;
2695                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2696                                                              &tvlv_tt_data,
2697                                                              &tt_change,
2698                                                              &tt_len);
2699                 if (!tt_len)
2700                         goto unlock;
2701 
2702                 /* Copy the last orig_node's OGM buffer */
2703                 memcpy(tt_change, bat_priv->tt.last_changeset,
2704                        bat_priv->tt.last_changeset_len);
2705                 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2706         } else {
2707                 req_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
2708 
2709                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2710                  * in the initial part
2711                  */
2712                 tt_len = -1;
2713                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2714                                                              &tvlv_tt_data,
2715                                                              &tt_change,
2716                                                              &tt_len);
2717                 if (!tt_len)
2718                         goto out;
2719 
2720                 /* fill the rest of the tvlv with the real TT entries */
2721                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
2722                                         tt_change, tt_len,
2723                                         batadv_tt_local_valid, NULL);
2724         }
2725 
2726         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2727         tvlv_tt_data->ttvn = req_ttvn;
2728 
2729         if (full_table)
2730                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2731 
2732         batadv_dbg(BATADV_DBG_TT, bat_priv,
2733                    "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2734                    orig_node->orig, full_table ? 'F' : '.', req_ttvn);
2735 
2736         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2737 
2738         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2739                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2740                                  tvlv_len);
2741 
2742         goto out;
2743 
2744 unlock:
2745         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2746 out:
2747         spin_unlock_bh(&bat_priv->tt.commit_lock);
2748         if (orig_node)
2749                 batadv_orig_node_free_ref(orig_node);
2750         if (primary_if)
2751                 batadv_hardif_free_ref(primary_if);
2752         kfree(tvlv_tt_data);
2753         /* The packet was for this host, so it doesn't need to be re-routed */
2754         return true;
2755 }
2756 
2757 /**
2758  * batadv_send_tt_response - send reply to tt request
2759  * @bat_priv: the bat priv with all the soft interface information
2760  * @tt_data: tt data containing the tt request information
2761  * @req_src: mac address of tt request sender
2762  * @req_dst: mac address of tt request recipient
2763  *
2764  * Returns true if tt request reply was sent, false otherwise.
2765  */
2766 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
2767                                     struct batadv_tvlv_tt_data *tt_data,
2768                                     uint8_t *req_src, uint8_t *req_dst)
2769 {
2770         if (batadv_is_my_mac(bat_priv, req_dst))
2771                 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
2772         else
2773                 return batadv_send_other_tt_response(bat_priv, tt_data,
2774                                                      req_src, req_dst);
2775 }
2776 
2777 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
2778                                       struct batadv_orig_node *orig_node,
2779                                       struct batadv_tvlv_tt_change *tt_change,
2780                                       uint16_t tt_num_changes, uint8_t ttvn)
2781 {
2782         int i;
2783         int roams;
2784 
2785         for (i = 0; i < tt_num_changes; i++) {
2786                 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
2787                         roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
2788                         batadv_tt_global_del(bat_priv, orig_node,
2789                                              (tt_change + i)->addr,
2790                                              ntohs((tt_change + i)->vid),
2791                                              "tt removed by changes",
2792                                              roams);
2793                 } else {
2794                         if (!batadv_tt_global_add(bat_priv, orig_node,
2795                                                   (tt_change + i)->addr,
2796                                                   ntohs((tt_change + i)->vid),
2797                                                   (tt_change + i)->flags, ttvn))
2798                                 /* In case of problem while storing a
2799                                  * global_entry, we stop the updating
2800                                  * procedure without committing the
2801                                  * ttvn change. This will avoid to send
2802                                  * corrupted data on tt_request
2803                                  */
2804                                 return;
2805                 }
2806         }
2807         orig_node->capa_initialized |= BATADV_ORIG_CAPA_HAS_TT;
2808 }
2809 
2810 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
2811                                   struct batadv_tvlv_tt_change *tt_change,
2812                                   uint8_t ttvn, uint8_t *resp_src,
2813                                   uint16_t num_entries)
2814 {
2815         struct batadv_orig_node *orig_node;
2816 
2817         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2818         if (!orig_node)
2819                 goto out;
2820 
2821         /* Purge the old table first.. */
2822         batadv_tt_global_del_orig(bat_priv, orig_node, -1,
2823                                   "Received full table");
2824 
2825         _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
2826                                   ttvn);
2827 
2828         spin_lock_bh(&orig_node->tt_buff_lock);
2829         kfree(orig_node->tt_buff);
2830         orig_node->tt_buff_len = 0;
2831         orig_node->tt_buff = NULL;
2832         spin_unlock_bh(&orig_node->tt_buff_lock);
2833 
2834         atomic_set(&orig_node->last_ttvn, ttvn);
2835 
2836 out:
2837         if (orig_node)
2838                 batadv_orig_node_free_ref(orig_node);
2839 }
2840 
2841 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
2842                                      struct batadv_orig_node *orig_node,
2843                                      uint16_t tt_num_changes, uint8_t ttvn,
2844                                      struct batadv_tvlv_tt_change *tt_change)
2845 {
2846         _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
2847                                   tt_num_changes, ttvn);
2848 
2849         batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
2850                                    batadv_tt_len(tt_num_changes));
2851         atomic_set(&orig_node->last_ttvn, ttvn);
2852 }
2853 
2854 /**
2855  * batadv_is_my_client - check if a client is served by the local node
2856  * @bat_priv: the bat priv with all the soft interface information
2857  * @addr: the mac adress of the client to check
2858  * @vid: VLAN identifier
2859  *
2860  * Returns true if the client is served by this node, false otherwise.
2861  */
2862 bool batadv_is_my_client(struct batadv_priv *bat_priv, const uint8_t *addr,
2863                          unsigned short vid)
2864 {
2865         struct batadv_tt_local_entry *tt_local_entry;
2866         bool ret = false;
2867 
2868         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
2869         if (!tt_local_entry)
2870                 goto out;
2871         /* Check if the client has been logically deleted (but is kept for
2872          * consistency purpose)
2873          */
2874         if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
2875             (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
2876                 goto out;
2877         ret = true;
2878 out:
2879         if (tt_local_entry)
2880                 batadv_tt_local_entry_free_ref(tt_local_entry);
2881         return ret;
2882 }
2883 
2884 /**
2885  * batadv_handle_tt_response - process incoming tt reply
2886  * @bat_priv: the bat priv with all the soft interface information
2887  * @tt_data: tt data containing the tt request information
2888  * @resp_src: mac address of tt reply sender
2889  * @num_entries: number of tt change entries appended to the tt data
2890  */
2891 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
2892                                       struct batadv_tvlv_tt_data *tt_data,
2893                                       uint8_t *resp_src, uint16_t num_entries)
2894 {
2895         struct batadv_tt_req_node *node, *safe;
2896         struct batadv_orig_node *orig_node = NULL;
2897         struct batadv_tvlv_tt_change *tt_change;
2898         uint8_t *tvlv_ptr = (uint8_t *)tt_data;
2899         uint16_t change_offset;
2900 
2901         batadv_dbg(BATADV_DBG_TT, bat_priv,
2902                    "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
2903                    resp_src, tt_data->ttvn, num_entries,
2904                    (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2905 
2906         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2907         if (!orig_node)
2908                 goto out;
2909 
2910         spin_lock_bh(&orig_node->tt_lock);
2911 
2912         change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
2913         change_offset *= ntohs(tt_data->num_vlan);
2914         change_offset += sizeof(*tt_data);
2915         tvlv_ptr += change_offset;
2916 
2917         tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
2918         if (tt_data->flags & BATADV_TT_FULL_TABLE) {
2919                 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
2920                                       resp_src, num_entries);
2921         } else {
2922                 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
2923                                          tt_data->ttvn, tt_change);
2924         }
2925 
2926         /* Recalculate the CRC for this orig_node and store it */
2927         batadv_tt_global_update_crc(bat_priv, orig_node);
2928 
2929         spin_unlock_bh(&orig_node->tt_lock);
2930 
2931         /* Delete the tt_req_node from pending tt_requests list */
2932         spin_lock_bh(&bat_priv->tt.req_list_lock);
2933         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2934                 if (!batadv_compare_eth(node->addr, resp_src))
2935                         continue;
2936                 list_del(&node->list);
2937                 kfree(node);
2938         }
2939 
2940         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2941 out:
2942         if (orig_node)
2943                 batadv_orig_node_free_ref(orig_node);
2944 }
2945 
2946 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
2947 {
2948         struct batadv_tt_roam_node *node, *safe;
2949 
2950         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2951 
2952         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2953                 list_del(&node->list);
2954                 kfree(node);
2955         }
2956 
2957         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2958 }
2959 
2960 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
2961 {
2962         struct batadv_tt_roam_node *node, *safe;
2963 
2964         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2965         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2966                 if (!batadv_has_timed_out(node->first_time,
2967                                           BATADV_ROAMING_MAX_TIME))
2968                         continue;
2969 
2970                 list_del(&node->list);
2971                 kfree(node);
2972         }
2973         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2974 }
2975 
2976 /* This function checks whether the client already reached the
2977  * maximum number of possible roaming phases. In this case the ROAMING_ADV
2978  * will not be sent.
2979  *
2980  * returns true if the ROAMING_ADV can be sent, false otherwise
2981  */
2982 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv,
2983                                        uint8_t *client)
2984 {
2985         struct batadv_tt_roam_node *tt_roam_node;
2986         bool ret = false;
2987 
2988         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2989         /* The new tt_req will be issued only if I'm not waiting for a
2990          * reply from the same orig_node yet
2991          */
2992         list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
2993                 if (!batadv_compare_eth(tt_roam_node->addr, client))
2994                         continue;
2995 
2996                 if (batadv_has_timed_out(tt_roam_node->first_time,
2997                                          BATADV_ROAMING_MAX_TIME))
2998                         continue;
2999 
3000                 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
3001                         /* Sorry, you roamed too many times! */
3002                         goto unlock;
3003                 ret = true;
3004                 break;
3005         }
3006 
3007         if (!ret) {
3008                 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
3009                 if (!tt_roam_node)
3010                         goto unlock;
3011 
3012                 tt_roam_node->first_time = jiffies;
3013                 atomic_set(&tt_roam_node->counter,
3014                            BATADV_ROAMING_MAX_COUNT - 1);
3015                 ether_addr_copy(tt_roam_node->addr, client);
3016 
3017                 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
3018                 ret = true;
3019         }
3020 
3021 unlock:
3022         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3023         return ret;
3024 }
3025 
3026 /**
3027  * batadv_send_roam_adv - send a roaming advertisement message
3028  * @bat_priv: the bat priv with all the soft interface information
3029  * @client: mac address of the roaming client
3030  * @vid: VLAN identifier
3031  * @orig_node: message destination
3032  *
3033  * Send a ROAMING_ADV message to the node which was previously serving this
3034  * client. This is done to inform the node that from now on all traffic destined
3035  * for this particular roamed client has to be forwarded to the sender of the
3036  * roaming message.
3037  */
3038 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
3039                                  unsigned short vid,
3040                                  struct batadv_orig_node *orig_node)
3041 {
3042         struct batadv_hard_iface *primary_if;
3043         struct batadv_tvlv_roam_adv tvlv_roam;
3044 
3045         primary_if = batadv_primary_if_get_selected(bat_priv);
3046         if (!primary_if)
3047                 goto out;
3048 
3049         /* before going on we have to check whether the client has
3050          * already roamed to us too many times
3051          */
3052         if (!batadv_tt_check_roam_count(bat_priv, client))
3053                 goto out;
3054 
3055         batadv_dbg(BATADV_DBG_TT, bat_priv,
3056                    "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
3057                    orig_node->orig, client, BATADV_PRINT_VID(vid));
3058 
3059         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
3060 
3061         memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
3062         tvlv_roam.vid = htons(vid);
3063 
3064         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3065                                  orig_node->orig, BATADV_TVLV_ROAM, 1,
3066                                  &tvlv_roam, sizeof(tvlv_roam));
3067 
3068 out:
3069         if (primary_if)
3070                 batadv_hardif_free_ref(primary_if);
3071 }
3072 
3073 static void batadv_tt_purge(struct work_struct *work)
3074 {
3075         struct delayed_work *delayed_work;
3076         struct batadv_priv_tt *priv_tt;
3077         struct batadv_priv *bat_priv;
3078 
3079         delayed_work = container_of(work, struct delayed_work, work);
3080         priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
3081         bat_priv = container_of(priv_tt, struct batadv_priv, tt);
3082 
3083         batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
3084         batadv_tt_global_purge(bat_priv);
3085         batadv_tt_req_purge(bat_priv);
3086         batadv_tt_roam_purge(bat_priv);
3087 
3088         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3089                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3090 }
3091 
3092 void batadv_tt_free(struct batadv_priv *bat_priv)
3093 {
3094         batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
3095         batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
3096 
3097         cancel_delayed_work_sync(&bat_priv->tt.work);
3098 
3099         batadv_tt_local_table_free(bat_priv);
3100         batadv_tt_global_table_free(bat_priv);
3101         batadv_tt_req_list_free(bat_priv);
3102         batadv_tt_changes_list_free(bat_priv);
3103         batadv_tt_roam_list_free(bat_priv);
3104 
3105         kfree(bat_priv->tt.last_changeset);
3106 }
3107 
3108 /**
3109  * batadv_tt_local_set_flags - set or unset the specified flags on the local
3110  *  table and possibly count them in the TT size
3111  * @bat_priv: the bat priv with all the soft interface information
3112  * @flags: the flag to switch
3113  * @enable: whether to set or unset the flag
3114  * @count: whether to increase the TT size by the number of changed entries
3115  */
3116 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv,
3117                                       uint16_t flags, bool enable, bool count)
3118 {
3119         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3120         struct batadv_tt_common_entry *tt_common_entry;
3121         uint16_t changed_num = 0;
3122         struct hlist_head *head;
3123         uint32_t i;
3124 
3125         if (!hash)
3126                 return;
3127 
3128         for (i = 0; i < hash->size; i++) {
3129                 head = &hash->table[i];
3130 
3131                 rcu_read_lock();
3132                 hlist_for_each_entry_rcu(tt_common_entry,
3133                                          head, hash_entry) {
3134                         if (enable) {
3135                                 if ((tt_common_entry->flags & flags) == flags)
3136                                         continue;
3137                                 tt_common_entry->flags |= flags;
3138                         } else {
3139                                 if (!(tt_common_entry->flags & flags))
3140                                         continue;
3141                                 tt_common_entry->flags &= ~flags;
3142                         }
3143                         changed_num++;
3144 
3145                         if (!count)
3146                                 continue;
3147 
3148                         batadv_tt_local_size_inc(bat_priv,
3149                                                  tt_common_entry->vid);
3150                 }
3151                 rcu_read_unlock();
3152         }
3153 }
3154 
3155 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3156 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3157 {
3158         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3159         struct batadv_tt_common_entry *tt_common;
3160         struct batadv_tt_local_entry *tt_local;
3161         struct batadv_softif_vlan *vlan;
3162         struct hlist_node *node_tmp;
3163         struct hlist_head *head;
3164         spinlock_t *list_lock; /* protects write access to the hash lists */
3165         uint32_t i;
3166 
3167         if (!hash)
3168                 return;
3169 
3170         for (i = 0; i < hash->size; i++) {
3171                 head = &hash->table[i];
3172                 list_lock = &hash->list_locks[i];
3173 
3174                 spin_lock_bh(list_lock);
3175                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3176                                           hash_entry) {
3177                         if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3178                                 continue;
3179 
3180                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3181                                    "Deleting local tt entry (%pM, vid: %d): pending\n",
3182                                    tt_common->addr,
3183                                    BATADV_PRINT_VID(tt_common->vid));
3184 
3185                         batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3186                         hlist_del_rcu(&tt_common->hash_entry);
3187                         tt_local = container_of(tt_common,
3188                                                 struct batadv_tt_local_entry,
3189                                                 common);
3190 
3191                         /* decrease the reference held for this vlan */
3192                         vlan = batadv_softif_vlan_get(bat_priv, tt_common->vid);
3193                         batadv_softif_vlan_free_ref(vlan);
3194                         batadv_softif_vlan_free_ref(vlan);
3195 
3196                         batadv_tt_local_entry_free_ref(tt_local);
3197                 }
3198                 spin_unlock_bh(list_lock);
3199         }
3200 }
3201 
3202 /**
3203  * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3204  *  which have been queued in the time since the last commit
3205  * @bat_priv: the bat priv with all the soft interface information
3206  *
3207  * Caller must hold tt->commit_lock.
3208  */
3209 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3210 {
3211         /* Update multicast addresses in local translation table */
3212         batadv_mcast_mla_update(bat_priv);
3213 
3214         if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3215                 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3216                         batadv_tt_tvlv_container_update(bat_priv);
3217                 return;
3218         }
3219 
3220         batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3221 
3222         batadv_tt_local_purge_pending_clients(bat_priv);
3223         batadv_tt_local_update_crc(bat_priv);
3224 
3225         /* Increment the TTVN only once per OGM interval */
3226         atomic_inc(&bat_priv->tt.vn);
3227         batadv_dbg(BATADV_DBG_TT, bat_priv,
3228                    "Local changes committed, updating to ttvn %u\n",
3229                    (uint8_t)atomic_read(&bat_priv->tt.vn));
3230 
3231         /* reset the sending counter */
3232         atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3233         batadv_tt_tvlv_container_update(bat_priv);
3234 }
3235 
3236 /**
3237  * batadv_tt_local_commit_changes - commit all pending local tt changes which
3238  *  have been queued in the time since the last commit
3239  * @bat_priv: the bat priv with all the soft interface information
3240  */
3241 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3242 {
3243         spin_lock_bh(&bat_priv->tt.commit_lock);
3244         batadv_tt_local_commit_changes_nolock(bat_priv);
3245         spin_unlock_bh(&bat_priv->tt.commit_lock);
3246 }
3247 
3248 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src,
3249                            uint8_t *dst, unsigned short vid)
3250 {
3251         struct batadv_tt_local_entry *tt_local_entry = NULL;
3252         struct batadv_tt_global_entry *tt_global_entry = NULL;
3253         struct batadv_softif_vlan *vlan;
3254         bool ret = false;
3255 
3256         vlan = batadv_softif_vlan_get(bat_priv, vid);
3257         if (!vlan || !atomic_read(&vlan->ap_isolation))
3258                 goto out;
3259 
3260         tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3261         if (!tt_local_entry)
3262                 goto out;
3263 
3264         tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
3265         if (!tt_global_entry)
3266                 goto out;
3267 
3268         if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3269                 goto out;
3270 
3271         ret = true;
3272 
3273 out:
3274         if (vlan)
3275                 batadv_softif_vlan_free_ref(vlan);
3276         if (tt_global_entry)
3277                 batadv_tt_global_entry_free_ref(tt_global_entry);
3278         if (tt_local_entry)
3279                 batadv_tt_local_entry_free_ref(tt_local_entry);
3280         return ret;
3281 }
3282 
3283 /**
3284  * batadv_tt_update_orig - update global translation table with new tt
3285  *  information received via ogms
3286  * @bat_priv: the bat priv with all the soft interface information
3287  * @orig: the orig_node of the ogm
3288  * @tt_vlan: pointer to the first tvlv VLAN entry
3289  * @tt_num_vlan: number of tvlv VLAN entries
3290  * @tt_change: pointer to the first entry in the TT buffer
3291  * @tt_num_changes: number of tt changes inside the tt buffer
3292  * @ttvn: translation table version number of this changeset
3293  * @tt_crc: crc32 checksum of orig node's translation table
3294  */
3295 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
3296                                   struct batadv_orig_node *orig_node,
3297                                   const void *tt_buff, uint16_t tt_num_vlan,
3298                                   struct batadv_tvlv_tt_change *tt_change,
3299                                   uint16_t tt_num_changes, uint8_t ttvn)
3300 {
3301         uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
3302         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3303         bool full_table = true;
3304         bool has_tt_init;
3305 
3306         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
3307         has_tt_init = orig_node->capa_initialized & BATADV_ORIG_CAPA_HAS_TT;
3308 
3309         /* orig table not initialised AND first diff is in the OGM OR the ttvn
3310          * increased by one -> we can apply the attached changes
3311          */
3312         if ((!has_tt_init && ttvn == 1) || ttvn - orig_ttvn == 1) {
3313                 /* the OGM could not contain the changes due to their size or
3314                  * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3315                  * times.
3316                  * In this case send a tt request
3317                  */
3318                 if (!tt_num_changes) {
3319                         full_table = false;
3320                         goto request_table;
3321                 }
3322 
3323                 spin_lock_bh(&orig_node->tt_lock);
3324 
3325                 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
3326                                          ttvn, tt_change);
3327 
3328                 /* Even if we received the precomputed crc with the OGM, we
3329                  * prefer to recompute it to spot any possible inconsistency
3330                  * in the global table
3331                  */
3332                 batadv_tt_global_update_crc(bat_priv, orig_node);
3333 
3334                 spin_unlock_bh(&orig_node->tt_lock);
3335 
3336                 /* The ttvn alone is not enough to guarantee consistency
3337                  * because a single value could represent different states
3338                  * (due to the wrap around). Thus a node has to check whether
3339                  * the resulting table (after applying the changes) is still
3340                  * consistent or not. E.g. a node could disconnect while its
3341                  * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3342                  * checking the CRC value is mandatory to detect the
3343                  * inconsistency
3344                  */
3345                 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
3346                                                 tt_num_vlan))
3347                         goto request_table;
3348         } else {
3349                 /* if we missed more than one change or our tables are not
3350                  * in sync anymore -> request fresh tt data
3351                  */
3352                 if (!has_tt_init || ttvn != orig_ttvn ||
3353                     !batadv_tt_global_check_crc(orig_node, tt_vlan,
3354                                                 tt_num_vlan)) {
3355 request_table:
3356                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3357                                    "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3358                                    orig_node->orig, ttvn, orig_ttvn,
3359                                    tt_num_changes);
3360                         batadv_send_tt_request(bat_priv, orig_node, ttvn,
3361                                                tt_vlan, tt_num_vlan,
3362                                                full_table);
3363                         return;
3364                 }
3365         }
3366 }
3367 
3368 /**
3369  * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3370  * @bat_priv: the bat priv with all the soft interface information
3371  * @addr: the mac address of the client to check
3372  * @vid: VLAN identifier
3373  *
3374  * Returns true if we know that the client has moved from its old originator
3375  * to another one. This entry is still kept for consistency purposes and will be
3376  * deleted later by a DEL or because of timeout
3377  */
3378 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
3379                                         uint8_t *addr, unsigned short vid)
3380 {
3381         struct batadv_tt_global_entry *tt_global_entry;
3382         bool ret = false;
3383 
3384         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
3385         if (!tt_global_entry)
3386                 goto out;
3387 
3388         ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3389         batadv_tt_global_entry_free_ref(tt_global_entry);
3390 out:
3391         return ret;
3392 }
3393 
3394 /**
3395  * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3396  * @bat_priv: the bat priv with all the soft interface information
3397  * @addr: the mac address of the local client to query
3398  * @vid: VLAN identifier
3399  *
3400  * Returns true if the local client is known to be roaming (it is not served by
3401  * this node anymore) or not. If yes, the client is still present in the table
3402  * to keep the latter consistent with the node TTVN
3403  */
3404 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
3405                                        uint8_t *addr, unsigned short vid)
3406 {
3407         struct batadv_tt_local_entry *tt_local_entry;
3408         bool ret = false;
3409 
3410         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3411         if (!tt_local_entry)
3412                 goto out;
3413 
3414         ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3415         batadv_tt_local_entry_free_ref(tt_local_entry);
3416 out:
3417         return ret;
3418 }
3419 
3420 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
3421                                           struct batadv_orig_node *orig_node,
3422                                           const unsigned char *addr,
3423                                           unsigned short vid)
3424 {
3425         bool ret = false;
3426 
3427         if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
3428                                   BATADV_TT_CLIENT_TEMP,
3429                                   atomic_read(&orig_node->last_ttvn)))
3430                 goto out;
3431 
3432         batadv_dbg(BATADV_DBG_TT, bat_priv,
3433                    "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3434                    addr, BATADV_PRINT_VID(vid), orig_node->orig);
3435         ret = true;
3436 out:
3437         return ret;
3438 }
3439 
3440 /**
3441  * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
3442  *  maximum packet size that can be transported through the mesh
3443  * @soft_iface: netdev struct of the mesh interface
3444  *
3445  * Remove entries older than 'timeout' and half timeout if more entries need
3446  * to be removed.
3447  */
3448 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
3449 {
3450         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
3451         int packet_size_max = atomic_read(&bat_priv->packet_size_max);
3452         int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
3453         bool reduced = false;
3454 
3455         spin_lock_bh(&bat_priv->tt.commit_lock);
3456 
3457         while (true) {
3458                 table_size = batadv_tt_local_table_transmit_size(bat_priv);
3459                 if (packet_size_max >= table_size)
3460                         break;
3461 
3462                 batadv_tt_local_purge(bat_priv, timeout);
3463                 batadv_tt_local_purge_pending_clients(bat_priv);
3464 
3465                 timeout /= 2;
3466                 reduced = true;
3467                 net_ratelimited_function(batadv_info, soft_iface,
3468                                          "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3469                                          packet_size_max);
3470         }
3471 
3472         /* commit these changes immediately, to avoid synchronization problem
3473          * with the TTVN
3474          */
3475         if (reduced)
3476                 batadv_tt_local_commit_changes_nolock(bat_priv);
3477 
3478         spin_unlock_bh(&bat_priv->tt.commit_lock);
3479 }
3480 
3481 /**
3482  * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3483  * @bat_priv: the bat priv with all the soft interface information
3484  * @orig: the orig_node of the ogm
3485  * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3486  * @tvlv_value: tvlv buffer containing the gateway data
3487  * @tvlv_value_len: tvlv buffer length
3488  */
3489 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
3490                                           struct batadv_orig_node *orig,
3491                                           uint8_t flags, void *tvlv_value,
3492                                           uint16_t tvlv_value_len)
3493 {
3494         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3495         struct batadv_tvlv_tt_change *tt_change;
3496         struct batadv_tvlv_tt_data *tt_data;
3497         uint16_t num_entries, num_vlan;
3498 
3499         if (tvlv_value_len < sizeof(*tt_data))
3500                 return;
3501 
3502         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3503         tvlv_value_len -= sizeof(*tt_data);
3504 
3505         num_vlan = ntohs(tt_data->num_vlan);
3506 
3507         if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
3508                 return;
3509 
3510         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3511         tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
3512         tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
3513 
3514         num_entries = batadv_tt_entries(tvlv_value_len);
3515 
3516         batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
3517                               num_entries, tt_data->ttvn);
3518 }
3519 
3520 /**
3521  * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3522  *  container
3523  * @bat_priv: the bat priv with all the soft interface information
3524  * @src: mac address of tt tvlv sender
3525  * @dst: mac address of tt tvlv recipient
3526  * @tvlv_value: tvlv buffer containing the tt data
3527  * @tvlv_value_len: tvlv buffer length
3528  *
3529  * Returns NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3530  * otherwise.
3531  */
3532 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3533                                              uint8_t *src, uint8_t *dst,
3534                                              void *tvlv_value,
3535                                              uint16_t tvlv_value_len)
3536 {
3537         struct batadv_tvlv_tt_data *tt_data;
3538         uint16_t tt_vlan_len, tt_num_entries;
3539         char tt_flag;
3540         bool ret;
3541 
3542         if (tvlv_value_len < sizeof(*tt_data))
3543                 return NET_RX_SUCCESS;
3544 
3545         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3546         tvlv_value_len -= sizeof(*tt_data);
3547 
3548         tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
3549         tt_vlan_len *= ntohs(tt_data->num_vlan);
3550 
3551         if (tvlv_value_len < tt_vlan_len)
3552                 return NET_RX_SUCCESS;
3553 
3554         tvlv_value_len -= tt_vlan_len;
3555         tt_num_entries = batadv_tt_entries(tvlv_value_len);
3556 
3557         switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
3558         case BATADV_TT_REQUEST:
3559                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
3560 
3561                 /* If this node cannot provide a TT response the tt_request is
3562                  * forwarded
3563                  */
3564                 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
3565                 if (!ret) {
3566                         if (tt_data->flags & BATADV_TT_FULL_TABLE)
3567                                 tt_flag = 'F';
3568                         else
3569                                 tt_flag = '.';
3570 
3571                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3572                                    "Routing TT_REQUEST to %pM [%c]\n",
3573                                    dst, tt_flag);
3574                         /* tvlv API will re-route the packet */
3575                         return NET_RX_DROP;
3576                 }
3577                 break;
3578         case BATADV_TT_RESPONSE:
3579                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
3580 
3581                 if (batadv_is_my_mac(bat_priv, dst)) {
3582                         batadv_handle_tt_response(bat_priv, tt_data,
3583                                                   src, tt_num_entries);
3584                         return NET_RX_SUCCESS;
3585                 }
3586 
3587                 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3588                         tt_flag =  'F';
3589                 else
3590                         tt_flag = '.';
3591 
3592                 batadv_dbg(BATADV_DBG_TT, bat_priv,
3593                            "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
3594 
3595                 /* tvlv API will re-route the packet */
3596                 return NET_RX_DROP;
3597         }
3598 
3599         return NET_RX_SUCCESS;
3600 }
3601 
3602 /**
3603  * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3604  * @bat_priv: the bat priv with all the soft interface information
3605  * @src: mac address of tt tvlv sender
3606  * @dst: mac address of tt tvlv recipient
3607  * @tvlv_value: tvlv buffer containing the tt data
3608  * @tvlv_value_len: tvlv buffer length
3609  *
3610  * Returns NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3611  * otherwise.
3612  */
3613 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3614                                                uint8_t *src, uint8_t *dst,
3615                                                void *tvlv_value,
3616                                                uint16_t tvlv_value_len)
3617 {
3618         struct batadv_tvlv_roam_adv *roaming_adv;
3619         struct batadv_orig_node *orig_node = NULL;
3620 
3621         /* If this node is not the intended recipient of the
3622          * roaming advertisement the packet is forwarded
3623          * (the tvlv API will re-route the packet).
3624          */
3625         if (!batadv_is_my_mac(bat_priv, dst))
3626                 return NET_RX_DROP;
3627 
3628         if (tvlv_value_len < sizeof(*roaming_adv))
3629                 goto out;
3630 
3631         orig_node = batadv_orig_hash_find(bat_priv, src);
3632         if (!orig_node)
3633                 goto out;
3634 
3635         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
3636         roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
3637 
3638         batadv_dbg(BATADV_DBG_TT, bat_priv,
3639                    "Received ROAMING_ADV from %pM (client %pM)\n",
3640                    src, roaming_adv->client);
3641 
3642         batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
3643                              ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
3644                              atomic_read(&orig_node->last_ttvn) + 1);
3645 
3646 out:
3647         if (orig_node)
3648                 batadv_orig_node_free_ref(orig_node);
3649         return NET_RX_SUCCESS;
3650 }
3651 
3652 /**
3653  * batadv_tt_init - initialise the translation table internals
3654  * @bat_priv: the bat priv with all the soft interface information
3655  *
3656  * Return 0 on success or negative error number in case of failure.
3657  */
3658 int batadv_tt_init(struct batadv_priv *bat_priv)
3659 {
3660         int ret;
3661 
3662         /* synchronized flags must be remote */
3663         BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
3664 
3665         ret = batadv_tt_local_init(bat_priv);
3666         if (ret < 0)
3667                 return ret;
3668 
3669         ret = batadv_tt_global_init(bat_priv);
3670         if (ret < 0)
3671                 return ret;
3672 
3673         batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
3674                                      batadv_tt_tvlv_unicast_handler_v1,
3675                                      BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
3676 
3677         batadv_tvlv_handler_register(bat_priv, NULL,
3678                                      batadv_roam_tvlv_unicast_handler_v1,
3679                                      BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
3680 
3681         INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
3682         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3683                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3684 
3685         return 1;
3686 }
3687 
3688 /**
3689  * batadv_tt_global_is_isolated - check if a client is marked as isolated
3690  * @bat_priv: the bat priv with all the soft interface information
3691  * @addr: the mac address of the client
3692  * @vid: the identifier of the VLAN where this client is connected
3693  *
3694  * Returns true if the client is marked with the TT_CLIENT_ISOLA flag, false
3695  * otherwise
3696  */
3697 bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
3698                                   const uint8_t *addr, unsigned short vid)
3699 {
3700         struct batadv_tt_global_entry *tt;
3701         bool ret;
3702 
3703         tt = batadv_tt_global_hash_find(bat_priv, addr, vid);
3704         if (!tt)
3705                 return false;
3706 
3707         ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA;
3708 
3709         batadv_tt_global_entry_free_ref(tt);
3710 
3711         return ret;
3712 }
3713 

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