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

Version: ~ [ linux-5.6 ] ~ [ linux-5.5.13 ] ~ [ linux-5.4.28 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.113 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.174 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.217 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.217 ] ~ [ 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-3.16.82 ] ~ [ 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 /*
  2  * Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
  3  *
  4  * Marek Lindner, Simon Wunderlich, Antonio Quartulli
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of version 2 of the GNU General Public
  8  * License as published by the Free Software Foundation.
  9  *
 10  * This program is distributed in the hope that it will be useful, but
 11  * WITHOUT ANY WARRANTY; without even the implied warranty of
 12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 13  * General Public License for more details.
 14  *
 15  * You should have received a copy of the GNU General Public License
 16  * along with this program; if not, write to the Free Software
 17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 18  * 02110-1301, USA
 19  *
 20  */
 21 
 22 #include "main.h"
 23 #include "translation-table.h"
 24 #include "soft-interface.h"
 25 #include "hard-interface.h"
 26 #include "send.h"
 27 #include "hash.h"
 28 #include "originator.h"
 29 #include "routing.h"
 30 #include "bridge_loop_avoidance.h"
 31 
 32 #include <linux/crc16.h>
 33 
 34 static void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client,
 35                           struct orig_node *orig_node);
 36 static void tt_purge(struct work_struct *work);
 37 static void tt_global_del_orig_list(struct tt_global_entry *tt_global_entry);
 38 
 39 /* returns 1 if they are the same mac addr */
 40 static int compare_tt(const struct hlist_node *node, const void *data2)
 41 {
 42         const void *data1 = container_of(node, struct tt_common_entry,
 43                                          hash_entry);
 44 
 45         return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
 46 }
 47 
 48 static void tt_start_timer(struct bat_priv *bat_priv)
 49 {
 50         INIT_DELAYED_WORK(&bat_priv->tt_work, tt_purge);
 51         queue_delayed_work(bat_event_workqueue, &bat_priv->tt_work,
 52                            msecs_to_jiffies(5000));
 53 }
 54 
 55 static struct tt_common_entry *tt_hash_find(struct hashtable_t *hash,
 56                                             const void *data)
 57 {
 58         struct hlist_head *head;
 59         struct hlist_node *node;
 60         struct tt_common_entry *tt_common_entry, *tt_common_entry_tmp = NULL;
 61         uint32_t index;
 62 
 63         if (!hash)
 64                 return NULL;
 65 
 66         index = choose_orig(data, hash->size);
 67         head = &hash->table[index];
 68 
 69         rcu_read_lock();
 70         hlist_for_each_entry_rcu(tt_common_entry, node, head, hash_entry) {
 71                 if (!compare_eth(tt_common_entry, data))
 72                         continue;
 73 
 74                 if (!atomic_inc_not_zero(&tt_common_entry->refcount))
 75                         continue;
 76 
 77                 tt_common_entry_tmp = tt_common_entry;
 78                 break;
 79         }
 80         rcu_read_unlock();
 81 
 82         return tt_common_entry_tmp;
 83 }
 84 
 85 static struct tt_local_entry *tt_local_hash_find(struct bat_priv *bat_priv,
 86                                                  const void *data)
 87 {
 88         struct tt_common_entry *tt_common_entry;
 89         struct tt_local_entry *tt_local_entry = NULL;
 90 
 91         tt_common_entry = tt_hash_find(bat_priv->tt_local_hash, data);
 92         if (tt_common_entry)
 93                 tt_local_entry = container_of(tt_common_entry,
 94                                               struct tt_local_entry, common);
 95         return tt_local_entry;
 96 }
 97 
 98 static struct tt_global_entry *tt_global_hash_find(struct bat_priv *bat_priv,
 99                                                    const void *data)
100 {
101         struct tt_common_entry *tt_common_entry;
102         struct tt_global_entry *tt_global_entry = NULL;
103 
104         tt_common_entry = tt_hash_find(bat_priv->tt_global_hash, data);
105         if (tt_common_entry)
106                 tt_global_entry = container_of(tt_common_entry,
107                                                struct tt_global_entry, common);
108         return tt_global_entry;
109 
110 }
111 
112 static void tt_local_entry_free_ref(struct tt_local_entry *tt_local_entry)
113 {
114         if (atomic_dec_and_test(&tt_local_entry->common.refcount))
115                 kfree_rcu(tt_local_entry, common.rcu);
116 }
117 
118 static void tt_global_entry_free_rcu(struct rcu_head *rcu)
119 {
120         struct tt_common_entry *tt_common_entry;
121         struct tt_global_entry *tt_global_entry;
122 
123         tt_common_entry = container_of(rcu, struct tt_common_entry, rcu);
124         tt_global_entry = container_of(tt_common_entry, struct tt_global_entry,
125                                        common);
126 
127         kfree(tt_global_entry);
128 }
129 
130 static void tt_global_entry_free_ref(struct tt_global_entry *tt_global_entry)
131 {
132         if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
133                 tt_global_del_orig_list(tt_global_entry);
134                 call_rcu(&tt_global_entry->common.rcu,
135                          tt_global_entry_free_rcu);
136         }
137 }
138 
139 static void tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
140 {
141         struct tt_orig_list_entry *orig_entry;
142 
143         orig_entry = container_of(rcu, struct tt_orig_list_entry, rcu);
144         orig_node_free_ref(orig_entry->orig_node);
145         kfree(orig_entry);
146 }
147 
148 static void tt_orig_list_entry_free_ref(struct tt_orig_list_entry *orig_entry)
149 {
150         /* to avoid race conditions, immediately decrease the tt counter */
151         atomic_dec(&orig_entry->orig_node->tt_size);
152         call_rcu(&orig_entry->rcu, tt_orig_list_entry_free_rcu);
153 }
154 
155 static void tt_local_event(struct bat_priv *bat_priv, const uint8_t *addr,
156                            uint8_t flags)
157 {
158         struct tt_change_node *tt_change_node;
159 
160         tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
161 
162         if (!tt_change_node)
163                 return;
164 
165         tt_change_node->change.flags = flags;
166         memcpy(tt_change_node->change.addr, addr, ETH_ALEN);
167 
168         spin_lock_bh(&bat_priv->tt_changes_list_lock);
169         /* track the change in the OGMinterval list */
170         list_add_tail(&tt_change_node->list, &bat_priv->tt_changes_list);
171         atomic_inc(&bat_priv->tt_local_changes);
172         spin_unlock_bh(&bat_priv->tt_changes_list_lock);
173 
174         atomic_set(&bat_priv->tt_ogm_append_cnt, 0);
175 }
176 
177 int tt_len(int changes_num)
178 {
179         return changes_num * sizeof(struct tt_change);
180 }
181 
182 static int tt_local_init(struct bat_priv *bat_priv)
183 {
184         if (bat_priv->tt_local_hash)
185                 return 1;
186 
187         bat_priv->tt_local_hash = hash_new(1024);
188 
189         if (!bat_priv->tt_local_hash)
190                 return 0;
191 
192         return 1;
193 }
194 
195 void tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
196                   int ifindex)
197 {
198         struct bat_priv *bat_priv = netdev_priv(soft_iface);
199         struct tt_local_entry *tt_local_entry = NULL;
200         struct tt_global_entry *tt_global_entry = NULL;
201         struct hlist_head *head;
202         struct hlist_node *node;
203         struct tt_orig_list_entry *orig_entry;
204         int hash_added;
205 
206         tt_local_entry = tt_local_hash_find(bat_priv, addr);
207 
208         if (tt_local_entry) {
209                 tt_local_entry->last_seen = jiffies;
210                 /* possibly unset the TT_CLIENT_PENDING flag */
211                 tt_local_entry->common.flags &= ~TT_CLIENT_PENDING;
212                 goto out;
213         }
214 
215         tt_local_entry = kmalloc(sizeof(*tt_local_entry), GFP_ATOMIC);
216         if (!tt_local_entry)
217                 goto out;
218 
219         bat_dbg(DBG_TT, bat_priv,
220                 "Creating new local tt entry: %pM (ttvn: %d)\n", addr,
221                 (uint8_t)atomic_read(&bat_priv->ttvn));
222 
223         memcpy(tt_local_entry->common.addr, addr, ETH_ALEN);
224         tt_local_entry->common.flags = NO_FLAGS;
225         if (is_wifi_iface(ifindex))
226                 tt_local_entry->common.flags |= TT_CLIENT_WIFI;
227         atomic_set(&tt_local_entry->common.refcount, 2);
228         tt_local_entry->last_seen = jiffies;
229 
230         /* the batman interface mac address should never be purged */
231         if (compare_eth(addr, soft_iface->dev_addr))
232                 tt_local_entry->common.flags |= TT_CLIENT_NOPURGE;
233 
234         /* The local entry has to be marked as NEW to avoid to send it in
235          * a full table response going out before the next ttvn increment
236          * (consistency check) */
237         tt_local_entry->common.flags |= TT_CLIENT_NEW;
238 
239         hash_added = hash_add(bat_priv->tt_local_hash, compare_tt, choose_orig,
240                          &tt_local_entry->common,
241                          &tt_local_entry->common.hash_entry);
242 
243         if (unlikely(hash_added != 0)) {
244                 /* remove the reference for the hash */
245                 tt_local_entry_free_ref(tt_local_entry);
246                 goto out;
247         }
248 
249         tt_local_event(bat_priv, addr, tt_local_entry->common.flags);
250 
251         /* remove address from global hash if present */
252         tt_global_entry = tt_global_hash_find(bat_priv, addr);
253 
254         /* Check whether it is a roaming! */
255         if (tt_global_entry) {
256                 /* These node are probably going to update their tt table */
257                 head = &tt_global_entry->orig_list;
258                 rcu_read_lock();
259                 hlist_for_each_entry_rcu(orig_entry, node, head, list) {
260                         orig_entry->orig_node->tt_poss_change = true;
261 
262                         send_roam_adv(bat_priv, tt_global_entry->common.addr,
263                                       orig_entry->orig_node);
264                 }
265                 rcu_read_unlock();
266                 /* The global entry has to be marked as ROAMING and
267                  * has to be kept for consistency purpose
268                  */
269                 tt_global_entry->common.flags |= TT_CLIENT_ROAM;
270                 tt_global_entry->roam_at = jiffies;
271         }
272 out:
273         if (tt_local_entry)
274                 tt_local_entry_free_ref(tt_local_entry);
275         if (tt_global_entry)
276                 tt_global_entry_free_ref(tt_global_entry);
277 }
278 
279 int tt_changes_fill_buffer(struct bat_priv *bat_priv,
280                            unsigned char *buff, int buff_len)
281 {
282         int count = 0, tot_changes = 0;
283         struct tt_change_node *entry, *safe;
284 
285         if (buff_len > 0)
286                 tot_changes = buff_len / tt_len(1);
287 
288         spin_lock_bh(&bat_priv->tt_changes_list_lock);
289         atomic_set(&bat_priv->tt_local_changes, 0);
290 
291         list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list,
292                                  list) {
293                 if (count < tot_changes) {
294                         memcpy(buff + tt_len(count),
295                                &entry->change, sizeof(struct tt_change));
296                         count++;
297                 }
298                 list_del(&entry->list);
299                 kfree(entry);
300         }
301         spin_unlock_bh(&bat_priv->tt_changes_list_lock);
302 
303         /* Keep the buffer for possible tt_request */
304         spin_lock_bh(&bat_priv->tt_buff_lock);
305         kfree(bat_priv->tt_buff);
306         bat_priv->tt_buff_len = 0;
307         bat_priv->tt_buff = NULL;
308         /* We check whether this new OGM has no changes due to size
309          * problems */
310         if (buff_len > 0) {
311                 /**
312                  * if kmalloc() fails we will reply with the full table
313                  * instead of providing the diff
314                  */
315                 bat_priv->tt_buff = kmalloc(buff_len, GFP_ATOMIC);
316                 if (bat_priv->tt_buff) {
317                         memcpy(bat_priv->tt_buff, buff, buff_len);
318                         bat_priv->tt_buff_len = buff_len;
319                 }
320         }
321         spin_unlock_bh(&bat_priv->tt_buff_lock);
322 
323         return tot_changes;
324 }
325 
326 int tt_local_seq_print_text(struct seq_file *seq, void *offset)
327 {
328         struct net_device *net_dev = (struct net_device *)seq->private;
329         struct bat_priv *bat_priv = netdev_priv(net_dev);
330         struct hashtable_t *hash = bat_priv->tt_local_hash;
331         struct tt_common_entry *tt_common_entry;
332         struct hard_iface *primary_if;
333         struct hlist_node *node;
334         struct hlist_head *head;
335         uint32_t i;
336         int ret = 0;
337 
338         primary_if = primary_if_get_selected(bat_priv);
339         if (!primary_if) {
340                 ret = seq_printf(seq,
341                                  "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
342                                  net_dev->name);
343                 goto out;
344         }
345 
346         if (primary_if->if_status != IF_ACTIVE) {
347                 ret = seq_printf(seq,
348                                  "BATMAN mesh %s disabled - primary interface not active\n",
349                                  net_dev->name);
350                 goto out;
351         }
352 
353         seq_printf(seq,
354                    "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
355                    net_dev->name, (uint8_t)atomic_read(&bat_priv->ttvn));
356 
357         for (i = 0; i < hash->size; i++) {
358                 head = &hash->table[i];
359 
360                 rcu_read_lock();
361                 hlist_for_each_entry_rcu(tt_common_entry, node,
362                                          head, hash_entry) {
363                         seq_printf(seq, " * %pM [%c%c%c%c%c]\n",
364                                    tt_common_entry->addr,
365                                    (tt_common_entry->flags &
366                                     TT_CLIENT_ROAM ? 'R' : '.'),
367                                    (tt_common_entry->flags &
368                                     TT_CLIENT_NOPURGE ? 'P' : '.'),
369                                    (tt_common_entry->flags &
370                                     TT_CLIENT_NEW ? 'N' : '.'),
371                                    (tt_common_entry->flags &
372                                     TT_CLIENT_PENDING ? 'X' : '.'),
373                                    (tt_common_entry->flags &
374                                     TT_CLIENT_WIFI ? 'W' : '.'));
375                 }
376                 rcu_read_unlock();
377         }
378 out:
379         if (primary_if)
380                 hardif_free_ref(primary_if);
381         return ret;
382 }
383 
384 static void tt_local_set_pending(struct bat_priv *bat_priv,
385                                  struct tt_local_entry *tt_local_entry,
386                                  uint16_t flags, const char *message)
387 {
388         tt_local_event(bat_priv, tt_local_entry->common.addr,
389                        tt_local_entry->common.flags | flags);
390 
391         /* The local client has to be marked as "pending to be removed" but has
392          * to be kept in the table in order to send it in a full table
393          * response issued before the net ttvn increment (consistency check) */
394         tt_local_entry->common.flags |= TT_CLIENT_PENDING;
395 
396         bat_dbg(DBG_TT, bat_priv,
397                 "Local tt entry (%pM) pending to be removed: %s\n",
398                 tt_local_entry->common.addr, message);
399 }
400 
401 void tt_local_remove(struct bat_priv *bat_priv, const uint8_t *addr,
402                      const char *message, bool roaming)
403 {
404         struct tt_local_entry *tt_local_entry = NULL;
405 
406         tt_local_entry = tt_local_hash_find(bat_priv, addr);
407         if (!tt_local_entry)
408                 goto out;
409 
410         tt_local_set_pending(bat_priv, tt_local_entry, TT_CLIENT_DEL |
411                              (roaming ? TT_CLIENT_ROAM : NO_FLAGS), message);
412 out:
413         if (tt_local_entry)
414                 tt_local_entry_free_ref(tt_local_entry);
415 }
416 
417 static void tt_local_purge(struct bat_priv *bat_priv)
418 {
419         struct hashtable_t *hash = bat_priv->tt_local_hash;
420         struct tt_local_entry *tt_local_entry;
421         struct tt_common_entry *tt_common_entry;
422         struct hlist_node *node, *node_tmp;
423         struct hlist_head *head;
424         spinlock_t *list_lock; /* protects write access to the hash lists */
425         uint32_t i;
426 
427         for (i = 0; i < hash->size; i++) {
428                 head = &hash->table[i];
429                 list_lock = &hash->list_locks[i];
430 
431                 spin_lock_bh(list_lock);
432                 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
433                                           head, hash_entry) {
434                         tt_local_entry = container_of(tt_common_entry,
435                                                       struct tt_local_entry,
436                                                       common);
437                         if (tt_local_entry->common.flags & TT_CLIENT_NOPURGE)
438                                 continue;
439 
440                         /* entry already marked for deletion */
441                         if (tt_local_entry->common.flags & TT_CLIENT_PENDING)
442                                 continue;
443 
444                         if (!has_timed_out(tt_local_entry->last_seen,
445                                            TT_LOCAL_TIMEOUT))
446                                 continue;
447 
448                         tt_local_set_pending(bat_priv, tt_local_entry,
449                                              TT_CLIENT_DEL, "timed out");
450                 }
451                 spin_unlock_bh(list_lock);
452         }
453 
454 }
455 
456 static void tt_local_table_free(struct bat_priv *bat_priv)
457 {
458         struct hashtable_t *hash;
459         spinlock_t *list_lock; /* protects write access to the hash lists */
460         struct tt_common_entry *tt_common_entry;
461         struct tt_local_entry *tt_local_entry;
462         struct hlist_node *node, *node_tmp;
463         struct hlist_head *head;
464         uint32_t i;
465 
466         if (!bat_priv->tt_local_hash)
467                 return;
468 
469         hash = bat_priv->tt_local_hash;
470 
471         for (i = 0; i < hash->size; i++) {
472                 head = &hash->table[i];
473                 list_lock = &hash->list_locks[i];
474 
475                 spin_lock_bh(list_lock);
476                 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
477                                           head, hash_entry) {
478                         hlist_del_rcu(node);
479                         tt_local_entry = container_of(tt_common_entry,
480                                                       struct tt_local_entry,
481                                                       common);
482                         tt_local_entry_free_ref(tt_local_entry);
483                 }
484                 spin_unlock_bh(list_lock);
485         }
486 
487         hash_destroy(hash);
488 
489         bat_priv->tt_local_hash = NULL;
490 }
491 
492 static int tt_global_init(struct bat_priv *bat_priv)
493 {
494         if (bat_priv->tt_global_hash)
495                 return 1;
496 
497         bat_priv->tt_global_hash = hash_new(1024);
498 
499         if (!bat_priv->tt_global_hash)
500                 return 0;
501 
502         return 1;
503 }
504 
505 static void tt_changes_list_free(struct bat_priv *bat_priv)
506 {
507         struct tt_change_node *entry, *safe;
508 
509         spin_lock_bh(&bat_priv->tt_changes_list_lock);
510 
511         list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list,
512                                  list) {
513                 list_del(&entry->list);
514                 kfree(entry);
515         }
516 
517         atomic_set(&bat_priv->tt_local_changes, 0);
518         spin_unlock_bh(&bat_priv->tt_changes_list_lock);
519 }
520 
521 /* find out if an orig_node is already in the list of a tt_global_entry.
522  * returns 1 if found, 0 otherwise
523  */
524 static bool tt_global_entry_has_orig(const struct tt_global_entry *entry,
525                                      const struct orig_node *orig_node)
526 {
527         struct tt_orig_list_entry *tmp_orig_entry;
528         const struct hlist_head *head;
529         struct hlist_node *node;
530         bool found = false;
531 
532         rcu_read_lock();
533         head = &entry->orig_list;
534         hlist_for_each_entry_rcu(tmp_orig_entry, node, head, list) {
535                 if (tmp_orig_entry->orig_node == orig_node) {
536                         found = true;
537                         break;
538                 }
539         }
540         rcu_read_unlock();
541         return found;
542 }
543 
544 static void tt_global_add_orig_entry(struct tt_global_entry *tt_global_entry,
545                                      struct orig_node *orig_node,
546                                      int ttvn)
547 {
548         struct tt_orig_list_entry *orig_entry;
549 
550         orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
551         if (!orig_entry)
552                 return;
553 
554         INIT_HLIST_NODE(&orig_entry->list);
555         atomic_inc(&orig_node->refcount);
556         atomic_inc(&orig_node->tt_size);
557         orig_entry->orig_node = orig_node;
558         orig_entry->ttvn = ttvn;
559 
560         spin_lock_bh(&tt_global_entry->list_lock);
561         hlist_add_head_rcu(&orig_entry->list,
562                            &tt_global_entry->orig_list);
563         spin_unlock_bh(&tt_global_entry->list_lock);
564 }
565 
566 /* caller must hold orig_node refcount */
567 int tt_global_add(struct bat_priv *bat_priv, struct orig_node *orig_node,
568                   const unsigned char *tt_addr, uint8_t ttvn, bool roaming,
569                   bool wifi)
570 {
571         struct tt_global_entry *tt_global_entry = NULL;
572         int ret = 0;
573         int hash_added;
574 
575         tt_global_entry = tt_global_hash_find(bat_priv, tt_addr);
576 
577         if (!tt_global_entry) {
578                 tt_global_entry = kzalloc(sizeof(*tt_global_entry),
579                                           GFP_ATOMIC);
580                 if (!tt_global_entry)
581                         goto out;
582 
583                 memcpy(tt_global_entry->common.addr, tt_addr, ETH_ALEN);
584 
585                 tt_global_entry->common.flags = NO_FLAGS;
586                 tt_global_entry->roam_at = 0;
587                 atomic_set(&tt_global_entry->common.refcount, 2);
588 
589                 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
590                 spin_lock_init(&tt_global_entry->list_lock);
591 
592                 hash_added = hash_add(bat_priv->tt_global_hash, compare_tt,
593                                  choose_orig, &tt_global_entry->common,
594                                  &tt_global_entry->common.hash_entry);
595 
596                 if (unlikely(hash_added != 0)) {
597                         /* remove the reference for the hash */
598                         tt_global_entry_free_ref(tt_global_entry);
599                         goto out_remove;
600                 }
601 
602                 tt_global_add_orig_entry(tt_global_entry, orig_node, ttvn);
603         } else {
604                 /* there is already a global entry, use this one. */
605 
606                 /* If there is the TT_CLIENT_ROAM flag set, there is only one
607                  * originator left in the list and we previously received a
608                  * delete + roaming change for this originator.
609                  *
610                  * We should first delete the old originator before adding the
611                  * new one.
612                  */
613                 if (tt_global_entry->common.flags & TT_CLIENT_ROAM) {
614                         tt_global_del_orig_list(tt_global_entry);
615                         tt_global_entry->common.flags &= ~TT_CLIENT_ROAM;
616                         tt_global_entry->roam_at = 0;
617                 }
618 
619                 if (!tt_global_entry_has_orig(tt_global_entry, orig_node))
620                         tt_global_add_orig_entry(tt_global_entry, orig_node,
621                                                  ttvn);
622         }
623 
624         if (wifi)
625                 tt_global_entry->common.flags |= TT_CLIENT_WIFI;
626 
627         bat_dbg(DBG_TT, bat_priv,
628                 "Creating new global tt entry: %pM (via %pM)\n",
629                 tt_global_entry->common.addr, orig_node->orig);
630 
631 out_remove:
632         /* remove address from local hash if present */
633         tt_local_remove(bat_priv, tt_global_entry->common.addr,
634                         "global tt received", roaming);
635         ret = 1;
636 out:
637         if (tt_global_entry)
638                 tt_global_entry_free_ref(tt_global_entry);
639         return ret;
640 }
641 
642 /* print all orig nodes who announce the address for this global entry.
643  * it is assumed that the caller holds rcu_read_lock();
644  */
645 static void tt_global_print_entry(struct tt_global_entry *tt_global_entry,
646                                   struct seq_file *seq)
647 {
648         struct hlist_head *head;
649         struct hlist_node *node;
650         struct tt_orig_list_entry *orig_entry;
651         struct tt_common_entry *tt_common_entry;
652         uint16_t flags;
653         uint8_t last_ttvn;
654 
655         tt_common_entry = &tt_global_entry->common;
656 
657         head = &tt_global_entry->orig_list;
658 
659         hlist_for_each_entry_rcu(orig_entry, node, head, list) {
660                 flags = tt_common_entry->flags;
661                 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
662                 seq_printf(seq, " * %pM  (%3u) via %pM     (%3u)   [%c%c]\n",
663                            tt_global_entry->common.addr, orig_entry->ttvn,
664                            orig_entry->orig_node->orig, last_ttvn,
665                            (flags & TT_CLIENT_ROAM ? 'R' : '.'),
666                            (flags & TT_CLIENT_WIFI ? 'W' : '.'));
667         }
668 }
669 
670 int tt_global_seq_print_text(struct seq_file *seq, void *offset)
671 {
672         struct net_device *net_dev = (struct net_device *)seq->private;
673         struct bat_priv *bat_priv = netdev_priv(net_dev);
674         struct hashtable_t *hash = bat_priv->tt_global_hash;
675         struct tt_common_entry *tt_common_entry;
676         struct tt_global_entry *tt_global_entry;
677         struct hard_iface *primary_if;
678         struct hlist_node *node;
679         struct hlist_head *head;
680         uint32_t i;
681         int ret = 0;
682 
683         primary_if = primary_if_get_selected(bat_priv);
684         if (!primary_if) {
685                 ret = seq_printf(seq,
686                                  "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
687                                  net_dev->name);
688                 goto out;
689         }
690 
691         if (primary_if->if_status != IF_ACTIVE) {
692                 ret = seq_printf(seq,
693                                  "BATMAN mesh %s disabled - primary interface not active\n",
694                                  net_dev->name);
695                 goto out;
696         }
697 
698         seq_printf(seq,
699                    "Globally announced TT entries received via the mesh %s\n",
700                    net_dev->name);
701         seq_printf(seq, "       %-13s %s       %-15s %s %s\n",
702                    "Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags");
703 
704         for (i = 0; i < hash->size; i++) {
705                 head = &hash->table[i];
706 
707                 rcu_read_lock();
708                 hlist_for_each_entry_rcu(tt_common_entry, node,
709                                          head, hash_entry) {
710                         tt_global_entry = container_of(tt_common_entry,
711                                                        struct tt_global_entry,
712                                                        common);
713                         tt_global_print_entry(tt_global_entry, seq);
714                 }
715                 rcu_read_unlock();
716         }
717 out:
718         if (primary_if)
719                 hardif_free_ref(primary_if);
720         return ret;
721 }
722 
723 /* deletes the orig list of a tt_global_entry */
724 static void tt_global_del_orig_list(struct tt_global_entry *tt_global_entry)
725 {
726         struct hlist_head *head;
727         struct hlist_node *node, *safe;
728         struct tt_orig_list_entry *orig_entry;
729 
730         spin_lock_bh(&tt_global_entry->list_lock);
731         head = &tt_global_entry->orig_list;
732         hlist_for_each_entry_safe(orig_entry, node, safe, head, list) {
733                 hlist_del_rcu(node);
734                 tt_orig_list_entry_free_ref(orig_entry);
735         }
736         spin_unlock_bh(&tt_global_entry->list_lock);
737 
738 }
739 
740 static void tt_global_del_orig_entry(struct bat_priv *bat_priv,
741                                      struct tt_global_entry *tt_global_entry,
742                                      struct orig_node *orig_node,
743                                      const char *message)
744 {
745         struct hlist_head *head;
746         struct hlist_node *node, *safe;
747         struct tt_orig_list_entry *orig_entry;
748 
749         spin_lock_bh(&tt_global_entry->list_lock);
750         head = &tt_global_entry->orig_list;
751         hlist_for_each_entry_safe(orig_entry, node, safe, head, list) {
752                 if (orig_entry->orig_node == orig_node) {
753                         bat_dbg(DBG_TT, bat_priv,
754                                 "Deleting %pM from global tt entry %pM: %s\n",
755                                 orig_node->orig, tt_global_entry->common.addr,
756                                 message);
757                         hlist_del_rcu(node);
758                         tt_orig_list_entry_free_ref(orig_entry);
759                 }
760         }
761         spin_unlock_bh(&tt_global_entry->list_lock);
762 }
763 
764 static void tt_global_del_struct(struct bat_priv *bat_priv,
765                                  struct tt_global_entry *tt_global_entry,
766                                  const char *message)
767 {
768         bat_dbg(DBG_TT, bat_priv,
769                 "Deleting global tt entry %pM: %s\n",
770                 tt_global_entry->common.addr, message);
771 
772         hash_remove(bat_priv->tt_global_hash, compare_tt, choose_orig,
773                     tt_global_entry->common.addr);
774         tt_global_entry_free_ref(tt_global_entry);
775 
776 }
777 
778 /* If the client is to be deleted, we check if it is the last origantor entry
779  * within tt_global entry. If yes, we set the TT_CLIENT_ROAM flag and the timer,
780  * otherwise we simply remove the originator scheduled for deletion.
781  */
782 static void tt_global_del_roaming(struct bat_priv *bat_priv,
783                                   struct tt_global_entry *tt_global_entry,
784                                   struct orig_node *orig_node,
785                                   const char *message)
786 {
787         bool last_entry = true;
788         struct hlist_head *head;
789         struct hlist_node *node;
790         struct tt_orig_list_entry *orig_entry;
791 
792         /* no local entry exists, case 1:
793          * Check if this is the last one or if other entries exist.
794          */
795 
796         rcu_read_lock();
797         head = &tt_global_entry->orig_list;
798         hlist_for_each_entry_rcu(orig_entry, node, head, list) {
799                 if (orig_entry->orig_node != orig_node) {
800                         last_entry = false;
801                         break;
802                 }
803         }
804         rcu_read_unlock();
805 
806         if (last_entry) {
807                 /* its the last one, mark for roaming. */
808                 tt_global_entry->common.flags |= TT_CLIENT_ROAM;
809                 tt_global_entry->roam_at = jiffies;
810         } else
811                 /* there is another entry, we can simply delete this
812                  * one and can still use the other one.
813                  */
814                 tt_global_del_orig_entry(bat_priv, tt_global_entry,
815                                          orig_node, message);
816 }
817 
818 
819 
820 static void tt_global_del(struct bat_priv *bat_priv,
821                           struct orig_node *orig_node,
822                           const unsigned char *addr,
823                           const char *message, bool roaming)
824 {
825         struct tt_global_entry *tt_global_entry = NULL;
826         struct tt_local_entry *tt_local_entry = NULL;
827 
828         tt_global_entry = tt_global_hash_find(bat_priv, addr);
829         if (!tt_global_entry)
830                 goto out;
831 
832         if (!roaming) {
833                 tt_global_del_orig_entry(bat_priv, tt_global_entry, orig_node,
834                                          message);
835 
836                 if (hlist_empty(&tt_global_entry->orig_list))
837                         tt_global_del_struct(bat_priv, tt_global_entry,
838                                              message);
839 
840                 goto out;
841         }
842 
843         /* if we are deleting a global entry due to a roam
844          * event, there are two possibilities:
845          * 1) the client roamed from node A to node B => if there
846          *    is only one originator left for this client, we mark
847          *    it with TT_CLIENT_ROAM, we start a timer and we
848          *    wait for node B to claim it. In case of timeout
849          *    the entry is purged.
850          *
851          *    If there are other originators left, we directly delete
852          *    the originator.
853          * 2) the client roamed to us => we can directly delete
854          *    the global entry, since it is useless now. */
855 
856         tt_local_entry = tt_local_hash_find(bat_priv,
857                                             tt_global_entry->common.addr);
858         if (tt_local_entry) {
859                 /* local entry exists, case 2: client roamed to us. */
860                 tt_global_del_orig_list(tt_global_entry);
861                 tt_global_del_struct(bat_priv, tt_global_entry, message);
862         } else
863                 /* no local entry exists, case 1: check for roaming */
864                 tt_global_del_roaming(bat_priv, tt_global_entry, orig_node,
865                                       message);
866 
867 
868 out:
869         if (tt_global_entry)
870                 tt_global_entry_free_ref(tt_global_entry);
871         if (tt_local_entry)
872                 tt_local_entry_free_ref(tt_local_entry);
873 }
874 
875 void tt_global_del_orig(struct bat_priv *bat_priv,
876                         struct orig_node *orig_node, const char *message)
877 {
878         struct tt_global_entry *tt_global_entry;
879         struct tt_common_entry *tt_common_entry;
880         uint32_t i;
881         struct hashtable_t *hash = bat_priv->tt_global_hash;
882         struct hlist_node *node, *safe;
883         struct hlist_head *head;
884         spinlock_t *list_lock; /* protects write access to the hash lists */
885 
886         if (!hash)
887                 return;
888 
889         for (i = 0; i < hash->size; i++) {
890                 head = &hash->table[i];
891                 list_lock = &hash->list_locks[i];
892 
893                 spin_lock_bh(list_lock);
894                 hlist_for_each_entry_safe(tt_common_entry, node, safe,
895                                           head, hash_entry) {
896                         tt_global_entry = container_of(tt_common_entry,
897                                                        struct tt_global_entry,
898                                                        common);
899 
900                         tt_global_del_orig_entry(bat_priv, tt_global_entry,
901                                                  orig_node, message);
902 
903                         if (hlist_empty(&tt_global_entry->orig_list)) {
904                                 bat_dbg(DBG_TT, bat_priv,
905                                         "Deleting global tt entry %pM: %s\n",
906                                         tt_global_entry->common.addr,
907                                         message);
908                                 hlist_del_rcu(node);
909                                 tt_global_entry_free_ref(tt_global_entry);
910                         }
911                 }
912                 spin_unlock_bh(list_lock);
913         }
914         orig_node->tt_initialised = false;
915 }
916 
917 static void tt_global_roam_purge(struct bat_priv *bat_priv)
918 {
919         struct hashtable_t *hash = bat_priv->tt_global_hash;
920         struct tt_common_entry *tt_common_entry;
921         struct tt_global_entry *tt_global_entry;
922         struct hlist_node *node, *node_tmp;
923         struct hlist_head *head;
924         spinlock_t *list_lock; /* protects write access to the hash lists */
925         uint32_t i;
926 
927         for (i = 0; i < hash->size; i++) {
928                 head = &hash->table[i];
929                 list_lock = &hash->list_locks[i];
930 
931                 spin_lock_bh(list_lock);
932                 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
933                                           head, hash_entry) {
934                         tt_global_entry = container_of(tt_common_entry,
935                                                        struct tt_global_entry,
936                                                        common);
937                         if (!(tt_global_entry->common.flags & TT_CLIENT_ROAM))
938                                 continue;
939                         if (!has_timed_out(tt_global_entry->roam_at,
940                                            TT_CLIENT_ROAM_TIMEOUT))
941                                 continue;
942 
943                         bat_dbg(DBG_TT, bat_priv,
944                                 "Deleting global tt entry (%pM): Roaming timeout\n",
945                                 tt_global_entry->common.addr);
946 
947                         hlist_del_rcu(node);
948                         tt_global_entry_free_ref(tt_global_entry);
949                 }
950                 spin_unlock_bh(list_lock);
951         }
952 
953 }
954 
955 static void tt_global_table_free(struct bat_priv *bat_priv)
956 {
957         struct hashtable_t *hash;
958         spinlock_t *list_lock; /* protects write access to the hash lists */
959         struct tt_common_entry *tt_common_entry;
960         struct tt_global_entry *tt_global_entry;
961         struct hlist_node *node, *node_tmp;
962         struct hlist_head *head;
963         uint32_t i;
964 
965         if (!bat_priv->tt_global_hash)
966                 return;
967 
968         hash = bat_priv->tt_global_hash;
969 
970         for (i = 0; i < hash->size; i++) {
971                 head = &hash->table[i];
972                 list_lock = &hash->list_locks[i];
973 
974                 spin_lock_bh(list_lock);
975                 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
976                                           head, hash_entry) {
977                         hlist_del_rcu(node);
978                         tt_global_entry = container_of(tt_common_entry,
979                                                        struct tt_global_entry,
980                                                        common);
981                         tt_global_entry_free_ref(tt_global_entry);
982                 }
983                 spin_unlock_bh(list_lock);
984         }
985 
986         hash_destroy(hash);
987 
988         bat_priv->tt_global_hash = NULL;
989 }
990 
991 static bool _is_ap_isolated(struct tt_local_entry *tt_local_entry,
992                             struct tt_global_entry *tt_global_entry)
993 {
994         bool ret = false;
995 
996         if (tt_local_entry->common.flags & TT_CLIENT_WIFI &&
997             tt_global_entry->common.flags & TT_CLIENT_WIFI)
998                 ret = true;
999 
1000         return ret;
1001 }
1002 
1003 struct orig_node *transtable_search(struct bat_priv *bat_priv,
1004                                     const uint8_t *src, const uint8_t *addr)
1005 {
1006         struct tt_local_entry *tt_local_entry = NULL;
1007         struct tt_global_entry *tt_global_entry = NULL;
1008         struct orig_node *orig_node = NULL;
1009         struct neigh_node *router = NULL;
1010         struct hlist_head *head;
1011         struct hlist_node *node;
1012         struct tt_orig_list_entry *orig_entry;
1013         int best_tq;
1014 
1015         if (src && atomic_read(&bat_priv->ap_isolation)) {
1016                 tt_local_entry = tt_local_hash_find(bat_priv, src);
1017                 if (!tt_local_entry)
1018                         goto out;
1019         }
1020 
1021         tt_global_entry = tt_global_hash_find(bat_priv, addr);
1022         if (!tt_global_entry)
1023                 goto out;
1024 
1025         /* check whether the clients should not communicate due to AP
1026          * isolation */
1027         if (tt_local_entry && _is_ap_isolated(tt_local_entry, tt_global_entry))
1028                 goto out;
1029 
1030         best_tq = 0;
1031 
1032         rcu_read_lock();
1033         head = &tt_global_entry->orig_list;
1034         hlist_for_each_entry_rcu(orig_entry, node, head, list) {
1035                 router = orig_node_get_router(orig_entry->orig_node);
1036                 if (!router)
1037                         continue;
1038 
1039                 if (router->tq_avg > best_tq) {
1040                         orig_node = orig_entry->orig_node;
1041                         best_tq = router->tq_avg;
1042                 }
1043                 neigh_node_free_ref(router);
1044         }
1045         /* found anything? */
1046         if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
1047                 orig_node = NULL;
1048         rcu_read_unlock();
1049 out:
1050         if (tt_global_entry)
1051                 tt_global_entry_free_ref(tt_global_entry);
1052         if (tt_local_entry)
1053                 tt_local_entry_free_ref(tt_local_entry);
1054 
1055         return orig_node;
1056 }
1057 
1058 /* Calculates the checksum of the local table of a given orig_node */
1059 static uint16_t tt_global_crc(struct bat_priv *bat_priv,
1060                               struct orig_node *orig_node)
1061 {
1062         uint16_t total = 0, total_one;
1063         struct hashtable_t *hash = bat_priv->tt_global_hash;
1064         struct tt_common_entry *tt_common_entry;
1065         struct tt_global_entry *tt_global_entry;
1066         struct hlist_node *node;
1067         struct hlist_head *head;
1068         uint32_t i;
1069         int j;
1070 
1071         for (i = 0; i < hash->size; i++) {
1072                 head = &hash->table[i];
1073 
1074                 rcu_read_lock();
1075                 hlist_for_each_entry_rcu(tt_common_entry, node,
1076                                          head, hash_entry) {
1077                         tt_global_entry = container_of(tt_common_entry,
1078                                                        struct tt_global_entry,
1079                                                        common);
1080                         /* Roaming clients are in the global table for
1081                          * consistency only. They don't have to be
1082                          * taken into account while computing the
1083                          * global crc
1084                          */
1085                         if (tt_global_entry->common.flags & TT_CLIENT_ROAM)
1086                                 continue;
1087 
1088                         /* find out if this global entry is announced by this
1089                          * originator
1090                          */
1091                         if (!tt_global_entry_has_orig(tt_global_entry,
1092                                                       orig_node))
1093                                 continue;
1094 
1095                         total_one = 0;
1096                         for (j = 0; j < ETH_ALEN; j++)
1097                                 total_one = crc16_byte(total_one,
1098                                         tt_global_entry->common.addr[j]);
1099                         total ^= total_one;
1100                 }
1101                 rcu_read_unlock();
1102         }
1103 
1104         return total;
1105 }
1106 
1107 /* Calculates the checksum of the local table */
1108 uint16_t tt_local_crc(struct bat_priv *bat_priv)
1109 {
1110         uint16_t total = 0, total_one;
1111         struct hashtable_t *hash = bat_priv->tt_local_hash;
1112         struct tt_common_entry *tt_common_entry;
1113         struct hlist_node *node;
1114         struct hlist_head *head;
1115         uint32_t i;
1116         int j;
1117 
1118         for (i = 0; i < hash->size; i++) {
1119                 head = &hash->table[i];
1120 
1121                 rcu_read_lock();
1122                 hlist_for_each_entry_rcu(tt_common_entry, node,
1123                                          head, hash_entry) {
1124                         /* not yet committed clients have not to be taken into
1125                          * account while computing the CRC */
1126                         if (tt_common_entry->flags & TT_CLIENT_NEW)
1127                                 continue;
1128                         total_one = 0;
1129                         for (j = 0; j < ETH_ALEN; j++)
1130                                 total_one = crc16_byte(total_one,
1131                                                    tt_common_entry->addr[j]);
1132                         total ^= total_one;
1133                 }
1134                 rcu_read_unlock();
1135         }
1136 
1137         return total;
1138 }
1139 
1140 static void tt_req_list_free(struct bat_priv *bat_priv)
1141 {
1142         struct tt_req_node *node, *safe;
1143 
1144         spin_lock_bh(&bat_priv->tt_req_list_lock);
1145 
1146         list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
1147                 list_del(&node->list);
1148                 kfree(node);
1149         }
1150 
1151         spin_unlock_bh(&bat_priv->tt_req_list_lock);
1152 }
1153 
1154 static void tt_save_orig_buffer(struct bat_priv *bat_priv,
1155                                 struct orig_node *orig_node,
1156                                 const unsigned char *tt_buff,
1157                                 uint8_t tt_num_changes)
1158 {
1159         uint16_t tt_buff_len = tt_len(tt_num_changes);
1160 
1161         /* Replace the old buffer only if I received something in the
1162          * last OGM (the OGM could carry no changes) */
1163         spin_lock_bh(&orig_node->tt_buff_lock);
1164         if (tt_buff_len > 0) {
1165                 kfree(orig_node->tt_buff);
1166                 orig_node->tt_buff_len = 0;
1167                 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
1168                 if (orig_node->tt_buff) {
1169                         memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
1170                         orig_node->tt_buff_len = tt_buff_len;
1171                 }
1172         }
1173         spin_unlock_bh(&orig_node->tt_buff_lock);
1174 }
1175 
1176 static void tt_req_purge(struct bat_priv *bat_priv)
1177 {
1178         struct tt_req_node *node, *safe;
1179 
1180         spin_lock_bh(&bat_priv->tt_req_list_lock);
1181         list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
1182                 if (has_timed_out(node->issued_at, TT_REQUEST_TIMEOUT)) {
1183                         list_del(&node->list);
1184                         kfree(node);
1185                 }
1186         }
1187         spin_unlock_bh(&bat_priv->tt_req_list_lock);
1188 }
1189 
1190 /* returns the pointer to the new tt_req_node struct if no request
1191  * has already been issued for this orig_node, NULL otherwise */
1192 static struct tt_req_node *new_tt_req_node(struct bat_priv *bat_priv,
1193                                           struct orig_node *orig_node)
1194 {
1195         struct tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
1196 
1197         spin_lock_bh(&bat_priv->tt_req_list_lock);
1198         list_for_each_entry(tt_req_node_tmp, &bat_priv->tt_req_list, list) {
1199                 if (compare_eth(tt_req_node_tmp, orig_node) &&
1200                     !has_timed_out(tt_req_node_tmp->issued_at,
1201                                    TT_REQUEST_TIMEOUT))
1202                         goto unlock;
1203         }
1204 
1205         tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
1206         if (!tt_req_node)
1207                 goto unlock;
1208 
1209         memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN);
1210         tt_req_node->issued_at = jiffies;
1211 
1212         list_add(&tt_req_node->list, &bat_priv->tt_req_list);
1213 unlock:
1214         spin_unlock_bh(&bat_priv->tt_req_list_lock);
1215         return tt_req_node;
1216 }
1217 
1218 /* data_ptr is useless here, but has to be kept to respect the prototype */
1219 static int tt_local_valid_entry(const void *entry_ptr, const void *data_ptr)
1220 {
1221         const struct tt_common_entry *tt_common_entry = entry_ptr;
1222 
1223         if (tt_common_entry->flags & TT_CLIENT_NEW)
1224                 return 0;
1225         return 1;
1226 }
1227 
1228 static int tt_global_valid_entry(const void *entry_ptr, const void *data_ptr)
1229 {
1230         const struct tt_common_entry *tt_common_entry = entry_ptr;
1231         const struct tt_global_entry *tt_global_entry;
1232         const struct orig_node *orig_node = data_ptr;
1233 
1234         if (tt_common_entry->flags & TT_CLIENT_ROAM)
1235                 return 0;
1236 
1237         tt_global_entry = container_of(tt_common_entry, struct tt_global_entry,
1238                                        common);
1239 
1240         return tt_global_entry_has_orig(tt_global_entry, orig_node);
1241 }
1242 
1243 static struct sk_buff *tt_response_fill_table(uint16_t tt_len, uint8_t ttvn,
1244                                               struct hashtable_t *hash,
1245                                               struct hard_iface *primary_if,
1246                                               int (*valid_cb)(const void *,
1247                                                               const void *),
1248                                               void *cb_data)
1249 {
1250         struct tt_common_entry *tt_common_entry;
1251         struct tt_query_packet *tt_response;
1252         struct tt_change *tt_change;
1253         struct hlist_node *node;
1254         struct hlist_head *head;
1255         struct sk_buff *skb = NULL;
1256         uint16_t tt_tot, tt_count;
1257         ssize_t tt_query_size = sizeof(struct tt_query_packet);
1258         uint32_t i;
1259 
1260         if (tt_query_size + tt_len > primary_if->soft_iface->mtu) {
1261                 tt_len = primary_if->soft_iface->mtu - tt_query_size;
1262                 tt_len -= tt_len % sizeof(struct tt_change);
1263         }
1264         tt_tot = tt_len / sizeof(struct tt_change);
1265 
1266         skb = dev_alloc_skb(tt_query_size + tt_len + ETH_HLEN);
1267         if (!skb)
1268                 goto out;
1269 
1270         skb_reserve(skb, ETH_HLEN);
1271         tt_response = (struct tt_query_packet *)skb_put(skb,
1272                                                      tt_query_size + tt_len);
1273         tt_response->ttvn = ttvn;
1274 
1275         tt_change = (struct tt_change *)(skb->data + tt_query_size);
1276         tt_count = 0;
1277 
1278         rcu_read_lock();
1279         for (i = 0; i < hash->size; i++) {
1280                 head = &hash->table[i];
1281 
1282                 hlist_for_each_entry_rcu(tt_common_entry, node,
1283                                          head, hash_entry) {
1284                         if (tt_count == tt_tot)
1285                                 break;
1286 
1287                         if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
1288                                 continue;
1289 
1290                         memcpy(tt_change->addr, tt_common_entry->addr,
1291                                ETH_ALEN);
1292                         tt_change->flags = NO_FLAGS;
1293 
1294                         tt_count++;
1295                         tt_change++;
1296                 }
1297         }
1298         rcu_read_unlock();
1299 
1300         /* store in the message the number of entries we have successfully
1301          * copied */
1302         tt_response->tt_data = htons(tt_count);
1303 
1304 out:
1305         return skb;
1306 }
1307 
1308 static int send_tt_request(struct bat_priv *bat_priv,
1309                            struct orig_node *dst_orig_node,
1310                            uint8_t ttvn, uint16_t tt_crc, bool full_table)
1311 {
1312         struct sk_buff *skb = NULL;
1313         struct tt_query_packet *tt_request;
1314         struct neigh_node *neigh_node = NULL;
1315         struct hard_iface *primary_if;
1316         struct tt_req_node *tt_req_node = NULL;
1317         int ret = 1;
1318 
1319         primary_if = primary_if_get_selected(bat_priv);
1320         if (!primary_if)
1321                 goto out;
1322 
1323         /* The new tt_req will be issued only if I'm not waiting for a
1324          * reply from the same orig_node yet */
1325         tt_req_node = new_tt_req_node(bat_priv, dst_orig_node);
1326         if (!tt_req_node)
1327                 goto out;
1328 
1329         skb = dev_alloc_skb(sizeof(struct tt_query_packet) + ETH_HLEN);
1330         if (!skb)
1331                 goto out;
1332 
1333         skb_reserve(skb, ETH_HLEN);
1334 
1335         tt_request = (struct tt_query_packet *)skb_put(skb,
1336                                 sizeof(struct tt_query_packet));
1337 
1338         tt_request->header.packet_type = BAT_TT_QUERY;
1339         tt_request->header.version = COMPAT_VERSION;
1340         memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1341         memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN);
1342         tt_request->header.ttl = TTL;
1343         tt_request->ttvn = ttvn;
1344         tt_request->tt_data = htons(tt_crc);
1345         tt_request->flags = TT_REQUEST;
1346 
1347         if (full_table)
1348                 tt_request->flags |= TT_FULL_TABLE;
1349 
1350         neigh_node = orig_node_get_router(dst_orig_node);
1351         if (!neigh_node)
1352                 goto out;
1353 
1354         bat_dbg(DBG_TT, bat_priv,
1355                 "Sending TT_REQUEST to %pM via %pM [%c]\n",
1356                 dst_orig_node->orig, neigh_node->addr,
1357                 (full_table ? 'F' : '.'));
1358 
1359         send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1360         ret = 0;
1361 
1362 out:
1363         if (neigh_node)
1364                 neigh_node_free_ref(neigh_node);
1365         if (primary_if)
1366                 hardif_free_ref(primary_if);
1367         if (ret)
1368                 kfree_skb(skb);
1369         if (ret && tt_req_node) {
1370                 spin_lock_bh(&bat_priv->tt_req_list_lock);
1371                 list_del(&tt_req_node->list);
1372                 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1373                 kfree(tt_req_node);
1374         }
1375         return ret;
1376 }
1377 
1378 static bool send_other_tt_response(struct bat_priv *bat_priv,
1379                                    struct tt_query_packet *tt_request)
1380 {
1381         struct orig_node *req_dst_orig_node = NULL, *res_dst_orig_node = NULL;
1382         struct neigh_node *neigh_node = NULL;
1383         struct hard_iface *primary_if = NULL;
1384         uint8_t orig_ttvn, req_ttvn, ttvn;
1385         int ret = false;
1386         unsigned char *tt_buff;
1387         bool full_table;
1388         uint16_t tt_len, tt_tot;
1389         struct sk_buff *skb = NULL;
1390         struct tt_query_packet *tt_response;
1391 
1392         bat_dbg(DBG_TT, bat_priv,
1393                 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
1394                 tt_request->src, tt_request->ttvn, tt_request->dst,
1395                 (tt_request->flags & TT_FULL_TABLE ? 'F' : '.'));
1396 
1397         /* Let's get the orig node of the REAL destination */
1398         req_dst_orig_node = orig_hash_find(bat_priv, tt_request->dst);
1399         if (!req_dst_orig_node)
1400                 goto out;
1401 
1402         res_dst_orig_node = orig_hash_find(bat_priv, tt_request->src);
1403         if (!res_dst_orig_node)
1404                 goto out;
1405 
1406         neigh_node = orig_node_get_router(res_dst_orig_node);
1407         if (!neigh_node)
1408                 goto out;
1409 
1410         primary_if = primary_if_get_selected(bat_priv);
1411         if (!primary_if)
1412                 goto out;
1413 
1414         orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1415         req_ttvn = tt_request->ttvn;
1416 
1417         /* I don't have the requested data */
1418         if (orig_ttvn != req_ttvn ||
1419             tt_request->tt_data != req_dst_orig_node->tt_crc)
1420                 goto out;
1421 
1422         /* If the full table has been explicitly requested */
1423         if (tt_request->flags & TT_FULL_TABLE ||
1424             !req_dst_orig_node->tt_buff)
1425                 full_table = true;
1426         else
1427                 full_table = false;
1428 
1429         /* In this version, fragmentation is not implemented, then
1430          * I'll send only one packet with as much TT entries as I can */
1431         if (!full_table) {
1432                 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
1433                 tt_len = req_dst_orig_node->tt_buff_len;
1434                 tt_tot = tt_len / sizeof(struct tt_change);
1435 
1436                 skb = dev_alloc_skb(sizeof(struct tt_query_packet) +
1437                                     tt_len + ETH_HLEN);
1438                 if (!skb)
1439                         goto unlock;
1440 
1441                 skb_reserve(skb, ETH_HLEN);
1442                 tt_response = (struct tt_query_packet *)skb_put(skb,
1443                                 sizeof(struct tt_query_packet) + tt_len);
1444                 tt_response->ttvn = req_ttvn;
1445                 tt_response->tt_data = htons(tt_tot);
1446 
1447                 tt_buff = skb->data + sizeof(struct tt_query_packet);
1448                 /* Copy the last orig_node's OGM buffer */
1449                 memcpy(tt_buff, req_dst_orig_node->tt_buff,
1450                        req_dst_orig_node->tt_buff_len);
1451 
1452                 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1453         } else {
1454                 tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size) *
1455                                                 sizeof(struct tt_change);
1456                 ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1457 
1458                 skb = tt_response_fill_table(tt_len, ttvn,
1459                                              bat_priv->tt_global_hash,
1460                                              primary_if, tt_global_valid_entry,
1461                                              req_dst_orig_node);
1462                 if (!skb)
1463                         goto out;
1464 
1465                 tt_response = (struct tt_query_packet *)skb->data;
1466         }
1467 
1468         tt_response->header.packet_type = BAT_TT_QUERY;
1469         tt_response->header.version = COMPAT_VERSION;
1470         tt_response->header.ttl = TTL;
1471         memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN);
1472         memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1473         tt_response->flags = TT_RESPONSE;
1474 
1475         if (full_table)
1476                 tt_response->flags |= TT_FULL_TABLE;
1477 
1478         bat_dbg(DBG_TT, bat_priv,
1479                 "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n",
1480                 res_dst_orig_node->orig, neigh_node->addr,
1481                 req_dst_orig_node->orig, req_ttvn);
1482 
1483         send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1484         ret = true;
1485         goto out;
1486 
1487 unlock:
1488         spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1489 
1490 out:
1491         if (res_dst_orig_node)
1492                 orig_node_free_ref(res_dst_orig_node);
1493         if (req_dst_orig_node)
1494                 orig_node_free_ref(req_dst_orig_node);
1495         if (neigh_node)
1496                 neigh_node_free_ref(neigh_node);
1497         if (primary_if)
1498                 hardif_free_ref(primary_if);
1499         if (!ret)
1500                 kfree_skb(skb);
1501         return ret;
1502 
1503 }
1504 static bool send_my_tt_response(struct bat_priv *bat_priv,
1505                                 struct tt_query_packet *tt_request)
1506 {
1507         struct orig_node *orig_node = NULL;
1508         struct neigh_node *neigh_node = NULL;
1509         struct hard_iface *primary_if = NULL;
1510         uint8_t my_ttvn, req_ttvn, ttvn;
1511         int ret = false;
1512         unsigned char *tt_buff;
1513         bool full_table;
1514         uint16_t tt_len, tt_tot;
1515         struct sk_buff *skb = NULL;
1516         struct tt_query_packet *tt_response;
1517 
1518         bat_dbg(DBG_TT, bat_priv,
1519                 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
1520                 tt_request->src, tt_request->ttvn,
1521                 (tt_request->flags & TT_FULL_TABLE ? 'F' : '.'));
1522 
1523 
1524         my_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
1525         req_ttvn = tt_request->ttvn;
1526 
1527         orig_node = orig_hash_find(bat_priv, tt_request->src);
1528         if (!orig_node)
1529                 goto out;
1530 
1531         neigh_node = orig_node_get_router(orig_node);
1532         if (!neigh_node)
1533                 goto out;
1534 
1535         primary_if = primary_if_get_selected(bat_priv);
1536         if (!primary_if)
1537                 goto out;
1538 
1539         /* If the full table has been explicitly requested or the gap
1540          * is too big send the whole local translation table */
1541         if (tt_request->flags & TT_FULL_TABLE || my_ttvn != req_ttvn ||
1542             !bat_priv->tt_buff)
1543                 full_table = true;
1544         else
1545                 full_table = false;
1546 
1547         /* In this version, fragmentation is not implemented, then
1548          * I'll send only one packet with as much TT entries as I can */
1549         if (!full_table) {
1550                 spin_lock_bh(&bat_priv->tt_buff_lock);
1551                 tt_len = bat_priv->tt_buff_len;
1552                 tt_tot = tt_len / sizeof(struct tt_change);
1553 
1554                 skb = dev_alloc_skb(sizeof(struct tt_query_packet) +
1555                                     tt_len + ETH_HLEN);
1556                 if (!skb)
1557                         goto unlock;
1558 
1559                 skb_reserve(skb, ETH_HLEN);
1560                 tt_response = (struct tt_query_packet *)skb_put(skb,
1561                                 sizeof(struct tt_query_packet) + tt_len);
1562                 tt_response->ttvn = req_ttvn;
1563                 tt_response->tt_data = htons(tt_tot);
1564 
1565                 tt_buff = skb->data + sizeof(struct tt_query_packet);
1566                 memcpy(tt_buff, bat_priv->tt_buff,
1567                        bat_priv->tt_buff_len);
1568                 spin_unlock_bh(&bat_priv->tt_buff_lock);
1569         } else {
1570                 tt_len = (uint16_t)atomic_read(&bat_priv->num_local_tt) *
1571                                                 sizeof(struct tt_change);
1572                 ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
1573 
1574                 skb = tt_response_fill_table(tt_len, ttvn,
1575                                              bat_priv->tt_local_hash,
1576                                              primary_if, tt_local_valid_entry,
1577                                              NULL);
1578                 if (!skb)
1579                         goto out;
1580 
1581                 tt_response = (struct tt_query_packet *)skb->data;
1582         }
1583 
1584         tt_response->header.packet_type = BAT_TT_QUERY;
1585         tt_response->header.version = COMPAT_VERSION;
1586         tt_response->header.ttl = TTL;
1587         memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1588         memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1589         tt_response->flags = TT_RESPONSE;
1590 
1591         if (full_table)
1592                 tt_response->flags |= TT_FULL_TABLE;
1593 
1594         bat_dbg(DBG_TT, bat_priv,
1595                 "Sending TT_RESPONSE to %pM via %pM [%c]\n",
1596                 orig_node->orig, neigh_node->addr,
1597                 (tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
1598 
1599         send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1600         ret = true;
1601         goto out;
1602 
1603 unlock:
1604         spin_unlock_bh(&bat_priv->tt_buff_lock);
1605 out:
1606         if (orig_node)
1607                 orig_node_free_ref(orig_node);
1608         if (neigh_node)
1609                 neigh_node_free_ref(neigh_node);
1610         if (primary_if)
1611                 hardif_free_ref(primary_if);
1612         if (!ret)
1613                 kfree_skb(skb);
1614         /* This packet was for me, so it doesn't need to be re-routed */
1615         return true;
1616 }
1617 
1618 bool send_tt_response(struct bat_priv *bat_priv,
1619                       struct tt_query_packet *tt_request)
1620 {
1621         if (is_my_mac(tt_request->dst)) {
1622                 /* don't answer backbone gws! */
1623                 if (bla_is_backbone_gw_orig(bat_priv, tt_request->src))
1624                         return true;
1625 
1626                 return send_my_tt_response(bat_priv, tt_request);
1627         } else {
1628                 return send_other_tt_response(bat_priv, tt_request);
1629         }
1630 }
1631 
1632 static void _tt_update_changes(struct bat_priv *bat_priv,
1633                                struct orig_node *orig_node,
1634                                struct tt_change *tt_change,
1635                                uint16_t tt_num_changes, uint8_t ttvn)
1636 {
1637         int i;
1638 
1639         for (i = 0; i < tt_num_changes; i++) {
1640                 if ((tt_change + i)->flags & TT_CLIENT_DEL)
1641                         tt_global_del(bat_priv, orig_node,
1642                                       (tt_change + i)->addr,
1643                                       "tt removed by changes",
1644                                       (tt_change + i)->flags & TT_CLIENT_ROAM);
1645                 else
1646                         if (!tt_global_add(bat_priv, orig_node,
1647                                            (tt_change + i)->addr, ttvn, false,
1648                                            (tt_change + i)->flags &
1649                                                         TT_CLIENT_WIFI))
1650                                 /* In case of problem while storing a
1651                                  * global_entry, we stop the updating
1652                                  * procedure without committing the
1653                                  * ttvn change. This will avoid to send
1654                                  * corrupted data on tt_request
1655                                  */
1656                                 return;
1657         }
1658         orig_node->tt_initialised = true;
1659 }
1660 
1661 static void tt_fill_gtable(struct bat_priv *bat_priv,
1662                            struct tt_query_packet *tt_response)
1663 {
1664         struct orig_node *orig_node = NULL;
1665 
1666         orig_node = orig_hash_find(bat_priv, tt_response->src);
1667         if (!orig_node)
1668                 goto out;
1669 
1670         /* Purge the old table first.. */
1671         tt_global_del_orig(bat_priv, orig_node, "Received full table");
1672 
1673         _tt_update_changes(bat_priv, orig_node,
1674                            (struct tt_change *)(tt_response + 1),
1675                            tt_response->tt_data, tt_response->ttvn);
1676 
1677         spin_lock_bh(&orig_node->tt_buff_lock);
1678         kfree(orig_node->tt_buff);
1679         orig_node->tt_buff_len = 0;
1680         orig_node->tt_buff = NULL;
1681         spin_unlock_bh(&orig_node->tt_buff_lock);
1682 
1683         atomic_set(&orig_node->last_ttvn, tt_response->ttvn);
1684 
1685 out:
1686         if (orig_node)
1687                 orig_node_free_ref(orig_node);
1688 }
1689 
1690 static void tt_update_changes(struct bat_priv *bat_priv,
1691                               struct orig_node *orig_node,
1692                               uint16_t tt_num_changes, uint8_t ttvn,
1693                               struct tt_change *tt_change)
1694 {
1695         _tt_update_changes(bat_priv, orig_node, tt_change, tt_num_changes,
1696                            ttvn);
1697 
1698         tt_save_orig_buffer(bat_priv, orig_node, (unsigned char *)tt_change,
1699                             tt_num_changes);
1700         atomic_set(&orig_node->last_ttvn, ttvn);
1701 }
1702 
1703 bool is_my_client(struct bat_priv *bat_priv, const uint8_t *addr)
1704 {
1705         struct tt_local_entry *tt_local_entry = NULL;
1706         bool ret = false;
1707 
1708         tt_local_entry = tt_local_hash_find(bat_priv, addr);
1709         if (!tt_local_entry)
1710                 goto out;
1711         /* Check if the client has been logically deleted (but is kept for
1712          * consistency purpose) */
1713         if (tt_local_entry->common.flags & TT_CLIENT_PENDING)
1714                 goto out;
1715         ret = true;
1716 out:
1717         if (tt_local_entry)
1718                 tt_local_entry_free_ref(tt_local_entry);
1719         return ret;
1720 }
1721 
1722 void handle_tt_response(struct bat_priv *bat_priv,
1723                         struct tt_query_packet *tt_response)
1724 {
1725         struct tt_req_node *node, *safe;
1726         struct orig_node *orig_node = NULL;
1727 
1728         bat_dbg(DBG_TT, bat_priv,
1729                 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
1730                 tt_response->src, tt_response->ttvn, tt_response->tt_data,
1731                 (tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
1732 
1733         /* we should have never asked a backbone gw */
1734         if (bla_is_backbone_gw_orig(bat_priv, tt_response->src))
1735                 goto out;
1736 
1737         orig_node = orig_hash_find(bat_priv, tt_response->src);
1738         if (!orig_node)
1739                 goto out;
1740 
1741         if (tt_response->flags & TT_FULL_TABLE)
1742                 tt_fill_gtable(bat_priv, tt_response);
1743         else
1744                 tt_update_changes(bat_priv, orig_node, tt_response->tt_data,
1745                                   tt_response->ttvn,
1746                                   (struct tt_change *)(tt_response + 1));
1747 
1748         /* Delete the tt_req_node from pending tt_requests list */
1749         spin_lock_bh(&bat_priv->tt_req_list_lock);
1750         list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
1751                 if (!compare_eth(node->addr, tt_response->src))
1752                         continue;
1753                 list_del(&node->list);
1754                 kfree(node);
1755         }
1756         spin_unlock_bh(&bat_priv->tt_req_list_lock);
1757 
1758         /* Recalculate the CRC for this orig_node and store it */
1759         orig_node->tt_crc = tt_global_crc(bat_priv, orig_node);
1760         /* Roaming phase is over: tables are in sync again. I can
1761          * unset the flag */
1762         orig_node->tt_poss_change = false;
1763 out:
1764         if (orig_node)
1765                 orig_node_free_ref(orig_node);
1766 }
1767 
1768 int tt_init(struct bat_priv *bat_priv)
1769 {
1770         if (!tt_local_init(bat_priv))
1771                 return 0;
1772 
1773         if (!tt_global_init(bat_priv))
1774                 return 0;
1775 
1776         tt_start_timer(bat_priv);
1777 
1778         return 1;
1779 }
1780 
1781 static void tt_roam_list_free(struct bat_priv *bat_priv)
1782 {
1783         struct tt_roam_node *node, *safe;
1784 
1785         spin_lock_bh(&bat_priv->tt_roam_list_lock);
1786 
1787         list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
1788                 list_del(&node->list);
1789                 kfree(node);
1790         }
1791 
1792         spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1793 }
1794 
1795 static void tt_roam_purge(struct bat_priv *bat_priv)
1796 {
1797         struct tt_roam_node *node, *safe;
1798 
1799         spin_lock_bh(&bat_priv->tt_roam_list_lock);
1800         list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
1801                 if (!has_timed_out(node->first_time, ROAMING_MAX_TIME))
1802                         continue;
1803 
1804                 list_del(&node->list);
1805                 kfree(node);
1806         }
1807         spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1808 }
1809 
1810 /* This function checks whether the client already reached the
1811  * maximum number of possible roaming phases. In this case the ROAMING_ADV
1812  * will not be sent.
1813  *
1814  * returns true if the ROAMING_ADV can be sent, false otherwise */
1815 static bool tt_check_roam_count(struct bat_priv *bat_priv,
1816                                 uint8_t *client)
1817 {
1818         struct tt_roam_node *tt_roam_node;
1819         bool ret = false;
1820 
1821         spin_lock_bh(&bat_priv->tt_roam_list_lock);
1822         /* The new tt_req will be issued only if I'm not waiting for a
1823          * reply from the same orig_node yet */
1824         list_for_each_entry(tt_roam_node, &bat_priv->tt_roam_list, list) {
1825                 if (!compare_eth(tt_roam_node->addr, client))
1826                         continue;
1827 
1828                 if (has_timed_out(tt_roam_node->first_time, ROAMING_MAX_TIME))
1829                         continue;
1830 
1831                 if (!atomic_dec_not_zero(&tt_roam_node->counter))
1832                         /* Sorry, you roamed too many times! */
1833                         goto unlock;
1834                 ret = true;
1835                 break;
1836         }
1837 
1838         if (!ret) {
1839                 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
1840                 if (!tt_roam_node)
1841                         goto unlock;
1842 
1843                 tt_roam_node->first_time = jiffies;
1844                 atomic_set(&tt_roam_node->counter, ROAMING_MAX_COUNT - 1);
1845                 memcpy(tt_roam_node->addr, client, ETH_ALEN);
1846 
1847                 list_add(&tt_roam_node->list, &bat_priv->tt_roam_list);
1848                 ret = true;
1849         }
1850 
1851 unlock:
1852         spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1853         return ret;
1854 }
1855 
1856 static void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client,
1857                           struct orig_node *orig_node)
1858 {
1859         struct neigh_node *neigh_node = NULL;
1860         struct sk_buff *skb = NULL;
1861         struct roam_adv_packet *roam_adv_packet;
1862         int ret = 1;
1863         struct hard_iface *primary_if;
1864 
1865         /* before going on we have to check whether the client has
1866          * already roamed to us too many times */
1867         if (!tt_check_roam_count(bat_priv, client))
1868                 goto out;
1869 
1870         skb = dev_alloc_skb(sizeof(struct roam_adv_packet) + ETH_HLEN);
1871         if (!skb)
1872                 goto out;
1873 
1874         skb_reserve(skb, ETH_HLEN);
1875 
1876         roam_adv_packet = (struct roam_adv_packet *)skb_put(skb,
1877                                         sizeof(struct roam_adv_packet));
1878 
1879         roam_adv_packet->header.packet_type = BAT_ROAM_ADV;
1880         roam_adv_packet->header.version = COMPAT_VERSION;
1881         roam_adv_packet->header.ttl = TTL;
1882         primary_if = primary_if_get_selected(bat_priv);
1883         if (!primary_if)
1884                 goto out;
1885         memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1886         hardif_free_ref(primary_if);
1887         memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN);
1888         memcpy(roam_adv_packet->client, client, ETH_ALEN);
1889 
1890         neigh_node = orig_node_get_router(orig_node);
1891         if (!neigh_node)
1892                 goto out;
1893 
1894         bat_dbg(DBG_TT, bat_priv,
1895                 "Sending ROAMING_ADV to %pM (client %pM) via %pM\n",
1896                 orig_node->orig, client, neigh_node->addr);
1897 
1898         send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1899         ret = 0;
1900 
1901 out:
1902         if (neigh_node)
1903                 neigh_node_free_ref(neigh_node);
1904         if (ret)
1905                 kfree_skb(skb);
1906         return;
1907 }
1908 
1909 static void tt_purge(struct work_struct *work)
1910 {
1911         struct delayed_work *delayed_work =
1912                 container_of(work, struct delayed_work, work);
1913         struct bat_priv *bat_priv =
1914                 container_of(delayed_work, struct bat_priv, tt_work);
1915 
1916         tt_local_purge(bat_priv);
1917         tt_global_roam_purge(bat_priv);
1918         tt_req_purge(bat_priv);
1919         tt_roam_purge(bat_priv);
1920 
1921         tt_start_timer(bat_priv);
1922 }
1923 
1924 void tt_free(struct bat_priv *bat_priv)
1925 {
1926         cancel_delayed_work_sync(&bat_priv->tt_work);
1927 
1928         tt_local_table_free(bat_priv);
1929         tt_global_table_free(bat_priv);
1930         tt_req_list_free(bat_priv);
1931         tt_changes_list_free(bat_priv);
1932         tt_roam_list_free(bat_priv);
1933 
1934         kfree(bat_priv->tt_buff);
1935 }
1936 
1937 /* This function will enable or disable the specified flags for all the entries
1938  * in the given hash table and returns the number of modified entries */
1939 static uint16_t tt_set_flags(struct hashtable_t *hash, uint16_t flags,
1940                              bool enable)
1941 {
1942         uint32_t i;
1943         uint16_t changed_num = 0;
1944         struct hlist_head *head;
1945         struct hlist_node *node;
1946         struct tt_common_entry *tt_common_entry;
1947 
1948         if (!hash)
1949                 goto out;
1950 
1951         for (i = 0; i < hash->size; i++) {
1952                 head = &hash->table[i];
1953 
1954                 rcu_read_lock();
1955                 hlist_for_each_entry_rcu(tt_common_entry, node,
1956                                          head, hash_entry) {
1957                         if (enable) {
1958                                 if ((tt_common_entry->flags & flags) == flags)
1959                                         continue;
1960                                 tt_common_entry->flags |= flags;
1961                         } else {
1962                                 if (!(tt_common_entry->flags & flags))
1963                                         continue;
1964                                 tt_common_entry->flags &= ~flags;
1965                         }
1966                         changed_num++;
1967                 }
1968                 rcu_read_unlock();
1969         }
1970 out:
1971         return changed_num;
1972 }
1973 
1974 /* Purge out all the tt local entries marked with TT_CLIENT_PENDING */
1975 static void tt_local_purge_pending_clients(struct bat_priv *bat_priv)
1976 {
1977         struct hashtable_t *hash = bat_priv->tt_local_hash;
1978         struct tt_common_entry *tt_common_entry;
1979         struct tt_local_entry *tt_local_entry;
1980         struct hlist_node *node, *node_tmp;
1981         struct hlist_head *head;
1982         spinlock_t *list_lock; /* protects write access to the hash lists */
1983         uint32_t i;
1984 
1985         if (!hash)
1986                 return;
1987 
1988         for (i = 0; i < hash->size; i++) {
1989                 head = &hash->table[i];
1990                 list_lock = &hash->list_locks[i];
1991 
1992                 spin_lock_bh(list_lock);
1993                 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
1994                                           head, hash_entry) {
1995                         if (!(tt_common_entry->flags & TT_CLIENT_PENDING))
1996                                 continue;
1997 
1998                         bat_dbg(DBG_TT, bat_priv,
1999                                 "Deleting local tt entry (%pM): pending\n",
2000                                 tt_common_entry->addr);
2001 
2002                         atomic_dec(&bat_priv->num_local_tt);
2003                         hlist_del_rcu(node);
2004                         tt_local_entry = container_of(tt_common_entry,
2005                                                       struct tt_local_entry,
2006                                                       common);
2007                         tt_local_entry_free_ref(tt_local_entry);
2008                 }
2009                 spin_unlock_bh(list_lock);
2010         }
2011 
2012 }
2013 
2014 void tt_commit_changes(struct bat_priv *bat_priv)
2015 {
2016         uint16_t changed_num = tt_set_flags(bat_priv->tt_local_hash,
2017                                             TT_CLIENT_NEW, false);
2018         /* all the reset entries have now to be effectively counted as local
2019          * entries */
2020         atomic_add(changed_num, &bat_priv->num_local_tt);
2021         tt_local_purge_pending_clients(bat_priv);
2022 
2023         /* Increment the TTVN only once per OGM interval */
2024         atomic_inc(&bat_priv->ttvn);
2025         bat_dbg(DBG_TT, bat_priv, "Local changes committed, updating to ttvn %u\n",
2026                 (uint8_t)atomic_read(&bat_priv->ttvn));
2027         bat_priv->tt_poss_change = false;
2028 }
2029 
2030 bool is_ap_isolated(struct bat_priv *bat_priv, uint8_t *src, uint8_t *dst)
2031 {
2032         struct tt_local_entry *tt_local_entry = NULL;
2033         struct tt_global_entry *tt_global_entry = NULL;
2034         bool ret = false;
2035 
2036         if (!atomic_read(&bat_priv->ap_isolation))
2037                 goto out;
2038 
2039         tt_local_entry = tt_local_hash_find(bat_priv, dst);
2040         if (!tt_local_entry)
2041                 goto out;
2042 
2043         tt_global_entry = tt_global_hash_find(bat_priv, src);
2044         if (!tt_global_entry)
2045                 goto out;
2046 
2047         if (!_is_ap_isolated(tt_local_entry, tt_global_entry))
2048                 goto out;
2049 
2050         ret = true;
2051 
2052 out:
2053         if (tt_global_entry)
2054                 tt_global_entry_free_ref(tt_global_entry);
2055         if (tt_local_entry)
2056                 tt_local_entry_free_ref(tt_local_entry);
2057         return ret;
2058 }
2059 
2060 void tt_update_orig(struct bat_priv *bat_priv, struct orig_node *orig_node,
2061                     const unsigned char *tt_buff, uint8_t tt_num_changes,
2062                     uint8_t ttvn, uint16_t tt_crc)
2063 {
2064         uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
2065         bool full_table = true;
2066 
2067         /* don't care about a backbone gateways updates. */
2068         if (bla_is_backbone_gw_orig(bat_priv, orig_node->orig))
2069                 return;
2070 
2071         /* orig table not initialised AND first diff is in the OGM OR the ttvn
2072          * increased by one -> we can apply the attached changes */
2073         if ((!orig_node->tt_initialised && ttvn == 1) ||
2074             ttvn - orig_ttvn == 1) {
2075                 /* the OGM could not contain the changes due to their size or
2076                  * because they have already been sent TT_OGM_APPEND_MAX times.
2077                  * In this case send a tt request */
2078                 if (!tt_num_changes) {
2079                         full_table = false;
2080                         goto request_table;
2081                 }
2082 
2083                 tt_update_changes(bat_priv, orig_node, tt_num_changes, ttvn,
2084                                   (struct tt_change *)tt_buff);
2085 
2086                 /* Even if we received the precomputed crc with the OGM, we
2087                  * prefer to recompute it to spot any possible inconsistency
2088                  * in the global table */
2089                 orig_node->tt_crc = tt_global_crc(bat_priv, orig_node);
2090 
2091                 /* The ttvn alone is not enough to guarantee consistency
2092                  * because a single value could represent different states
2093                  * (due to the wrap around). Thus a node has to check whether
2094                  * the resulting table (after applying the changes) is still
2095                  * consistent or not. E.g. a node could disconnect while its
2096                  * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
2097                  * checking the CRC value is mandatory to detect the
2098                  * inconsistency */
2099                 if (orig_node->tt_crc != tt_crc)
2100                         goto request_table;
2101 
2102                 /* Roaming phase is over: tables are in sync again. I can
2103                  * unset the flag */
2104                 orig_node->tt_poss_change = false;
2105         } else {
2106                 /* if we missed more than one change or our tables are not
2107                  * in sync anymore -> request fresh tt data */
2108 
2109                 if (!orig_node->tt_initialised || ttvn != orig_ttvn ||
2110                     orig_node->tt_crc != tt_crc) {
2111 request_table:
2112                         bat_dbg(DBG_TT, bat_priv,
2113                                 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %u last_crc: %u num_changes: %u)\n",
2114                                 orig_node->orig, ttvn, orig_ttvn, tt_crc,
2115                                 orig_node->tt_crc, tt_num_changes);
2116                         send_tt_request(bat_priv, orig_node, ttvn, tt_crc,
2117                                         full_table);
2118                         return;
2119                 }
2120         }
2121 }
2122 
2123 /* returns true whether we know that the client has moved from its old
2124  * originator to another one. This entry is kept is still kept for consistency
2125  * purposes
2126  */
2127 bool tt_global_client_is_roaming(struct bat_priv *bat_priv, uint8_t *addr)
2128 {
2129         struct tt_global_entry *tt_global_entry;
2130         bool ret = false;
2131 
2132         tt_global_entry = tt_global_hash_find(bat_priv, addr);
2133         if (!tt_global_entry)
2134                 goto out;
2135 
2136         ret = tt_global_entry->common.flags & TT_CLIENT_ROAM;
2137         tt_global_entry_free_ref(tt_global_entry);
2138 out:
2139         return ret;
2140 }
2141 

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