batman-adv: remove references for global tt entries
[linux-2.6.git] / net / batman-adv / translation-table.c
1 /*
2  * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
3  *
4  * Marek Lindner, Simon Wunderlich
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
31 #include <linux/crc16.h>
32
33 static void _tt_global_del(struct bat_priv *bat_priv,
34                            struct tt_global_entry *tt_global_entry,
35                            const char *message);
36 static void tt_purge(struct work_struct *work);
37
38 /* returns 1 if they are the same mac addr */
39 static int compare_ltt(const struct hlist_node *node, const void *data2)
40 {
41         const void *data1 = container_of(node, struct tt_local_entry,
42                                          hash_entry);
43
44         return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
45 }
46
47 /* returns 1 if they are the same mac addr */
48 static int compare_gtt(const struct hlist_node *node, const void *data2)
49 {
50         const void *data1 = container_of(node, struct tt_global_entry,
51                                          hash_entry);
52
53         return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
54 }
55
56 static void tt_start_timer(struct bat_priv *bat_priv)
57 {
58         INIT_DELAYED_WORK(&bat_priv->tt_work, tt_purge);
59         queue_delayed_work(bat_event_workqueue, &bat_priv->tt_work,
60                            msecs_to_jiffies(5000));
61 }
62
63 static struct tt_local_entry *tt_local_hash_find(struct bat_priv *bat_priv,
64                                                  const void *data)
65 {
66         struct hashtable_t *hash = bat_priv->tt_local_hash;
67         struct hlist_head *head;
68         struct hlist_node *node;
69         struct tt_local_entry *tt_local_entry, *tt_local_entry_tmp = NULL;
70         int index;
71
72         if (!hash)
73                 return NULL;
74
75         index = choose_orig(data, hash->size);
76         head = &hash->table[index];
77
78         rcu_read_lock();
79         hlist_for_each_entry_rcu(tt_local_entry, node, head, hash_entry) {
80                 if (!compare_eth(tt_local_entry, data))
81                         continue;
82
83                 if (!atomic_inc_not_zero(&tt_local_entry->refcount))
84                         continue;
85
86                 tt_local_entry_tmp = tt_local_entry;
87                 break;
88         }
89         rcu_read_unlock();
90
91         return tt_local_entry_tmp;
92 }
93
94 static struct tt_global_entry *tt_global_hash_find(struct bat_priv *bat_priv,
95                                                    const void *data)
96 {
97         struct hashtable_t *hash = bat_priv->tt_global_hash;
98         struct hlist_head *head;
99         struct hlist_node *node;
100         struct tt_global_entry *tt_global_entry;
101         struct tt_global_entry *tt_global_entry_tmp = NULL;
102         int index;
103
104         if (!hash)
105                 return NULL;
106
107         index = choose_orig(data, hash->size);
108         head = &hash->table[index];
109
110         rcu_read_lock();
111         hlist_for_each_entry_rcu(tt_global_entry, node, head, hash_entry) {
112                 if (!compare_eth(tt_global_entry, data))
113                         continue;
114
115                 if (!atomic_inc_not_zero(&tt_global_entry->refcount))
116                         continue;
117
118                 tt_global_entry_tmp = tt_global_entry;
119                 break;
120         }
121         rcu_read_unlock();
122
123         return tt_global_entry_tmp;
124 }
125
126 static bool is_out_of_time(unsigned long starting_time, unsigned long timeout)
127 {
128         unsigned long deadline;
129         deadline = starting_time + msecs_to_jiffies(timeout);
130
131         return time_after(jiffies, deadline);
132 }
133
134 static void tt_local_entry_free_ref(struct tt_local_entry *tt_local_entry)
135 {
136         if (atomic_dec_and_test(&tt_local_entry->refcount))
137                 kfree_rcu(tt_local_entry, rcu);
138 }
139
140 static void tt_global_entry_free_rcu(struct rcu_head *rcu)
141 {
142         struct tt_global_entry *tt_global_entry;
143
144         tt_global_entry = container_of(rcu, struct tt_global_entry, rcu);
145
146         if (tt_global_entry->orig_node)
147                 orig_node_free_ref(tt_global_entry->orig_node);
148
149         kfree(tt_global_entry);
150 }
151
152 static void tt_global_entry_free_ref(struct tt_global_entry *tt_global_entry)
153 {
154         if (atomic_dec_and_test(&tt_global_entry->refcount))
155                 call_rcu(&tt_global_entry->rcu, tt_global_entry_free_rcu);
156 }
157
158 static void tt_local_event(struct bat_priv *bat_priv, const uint8_t *addr,
159                            uint8_t flags)
160 {
161         struct tt_change_node *tt_change_node;
162
163         tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
164
165         if (!tt_change_node)
166                 return;
167
168         tt_change_node->change.flags = flags;
169         memcpy(tt_change_node->change.addr, addr, ETH_ALEN);
170
171         spin_lock_bh(&bat_priv->tt_changes_list_lock);
172         /* track the change in the OGMinterval list */
173         list_add_tail(&tt_change_node->list, &bat_priv->tt_changes_list);
174         atomic_inc(&bat_priv->tt_local_changes);
175         spin_unlock_bh(&bat_priv->tt_changes_list_lock);
176
177         atomic_set(&bat_priv->tt_ogm_append_cnt, 0);
178 }
179
180 int tt_len(int changes_num)
181 {
182         return changes_num * sizeof(struct tt_change);
183 }
184
185 static int tt_local_init(struct bat_priv *bat_priv)
186 {
187         if (bat_priv->tt_local_hash)
188                 return 1;
189
190         bat_priv->tt_local_hash = hash_new(1024);
191
192         if (!bat_priv->tt_local_hash)
193                 return 0;
194
195         return 1;
196 }
197
198 void tt_local_add(struct net_device *soft_iface, const uint8_t *addr)
199 {
200         struct bat_priv *bat_priv = netdev_priv(soft_iface);
201         struct tt_local_entry *tt_local_entry = NULL;
202         struct tt_global_entry *tt_global_entry = NULL;
203
204         tt_local_entry = tt_local_hash_find(bat_priv, addr);
205
206         if (tt_local_entry) {
207                 tt_local_entry->last_seen = jiffies;
208                 goto out;
209         }
210
211         tt_local_entry = kmalloc(sizeof(*tt_local_entry), GFP_ATOMIC);
212         if (!tt_local_entry)
213                 goto out;
214
215         bat_dbg(DBG_TT, bat_priv,
216                 "Creating new local tt entry: %pM (ttvn: %d)\n", addr,
217                 (uint8_t)atomic_read(&bat_priv->ttvn));
218
219         memcpy(tt_local_entry->addr, addr, ETH_ALEN);
220         tt_local_entry->last_seen = jiffies;
221         tt_local_entry->flags = NO_FLAGS;
222         atomic_set(&tt_local_entry->refcount, 2);
223
224         /* the batman interface mac address should never be purged */
225         if (compare_eth(addr, soft_iface->dev_addr))
226                 tt_local_entry->flags |= TT_CLIENT_NOPURGE;
227
228         tt_local_event(bat_priv, addr, tt_local_entry->flags);
229
230         /* The local entry has to be marked as NEW to avoid to send it in
231          * a full table response going out before the next ttvn increment
232          * (consistency check) */
233         tt_local_entry->flags |= TT_CLIENT_NEW;
234
235         hash_add(bat_priv->tt_local_hash, compare_ltt, choose_orig,
236                  tt_local_entry, &tt_local_entry->hash_entry);
237
238         /* remove address from global hash if present */
239         tt_global_entry = tt_global_hash_find(bat_priv, addr);
240
241         /* Check whether it is a roaming! */
242         if (tt_global_entry) {
243                 /* This node is probably going to update its tt table */
244                 tt_global_entry->orig_node->tt_poss_change = true;
245                 /* The global entry has to be marked as PENDING and has to be
246                  * kept for consistency purpose */
247                 tt_global_entry->flags |= TT_CLIENT_PENDING;
248                 send_roam_adv(bat_priv, tt_global_entry->addr,
249                               tt_global_entry->orig_node);
250         }
251 out:
252         if (tt_local_entry)
253                 tt_local_entry_free_ref(tt_local_entry);
254         if (tt_global_entry)
255                 tt_global_entry_free_ref(tt_global_entry);
256 }
257
258 int tt_changes_fill_buffer(struct bat_priv *bat_priv,
259                            unsigned char *buff, int buff_len)
260 {
261         int count = 0, tot_changes = 0;
262         struct tt_change_node *entry, *safe;
263
264         if (buff_len > 0)
265                 tot_changes = buff_len / tt_len(1);
266
267         spin_lock_bh(&bat_priv->tt_changes_list_lock);
268         atomic_set(&bat_priv->tt_local_changes, 0);
269
270         list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list,
271                         list) {
272                 if (count < tot_changes) {
273                         memcpy(buff + tt_len(count),
274                                &entry->change, sizeof(struct tt_change));
275                         count++;
276                 }
277                 list_del(&entry->list);
278                 kfree(entry);
279         }
280         spin_unlock_bh(&bat_priv->tt_changes_list_lock);
281
282         /* Keep the buffer for possible tt_request */
283         spin_lock_bh(&bat_priv->tt_buff_lock);
284         kfree(bat_priv->tt_buff);
285         bat_priv->tt_buff_len = 0;
286         bat_priv->tt_buff = NULL;
287         /* We check whether this new OGM has no changes due to size
288          * problems */
289         if (buff_len > 0) {
290                 /**
291                  * if kmalloc() fails we will reply with the full table
292                  * instead of providing the diff
293                  */
294                 bat_priv->tt_buff = kmalloc(buff_len, GFP_ATOMIC);
295                 if (bat_priv->tt_buff) {
296                         memcpy(bat_priv->tt_buff, buff, buff_len);
297                         bat_priv->tt_buff_len = buff_len;
298                 }
299         }
300         spin_unlock_bh(&bat_priv->tt_buff_lock);
301
302         return tot_changes;
303 }
304
305 int tt_local_seq_print_text(struct seq_file *seq, void *offset)
306 {
307         struct net_device *net_dev = (struct net_device *)seq->private;
308         struct bat_priv *bat_priv = netdev_priv(net_dev);
309         struct hashtable_t *hash = bat_priv->tt_local_hash;
310         struct tt_local_entry *tt_local_entry;
311         struct hard_iface *primary_if;
312         struct hlist_node *node;
313         struct hlist_head *head;
314         size_t buf_size, pos;
315         char *buff;
316         int i, ret = 0;
317
318         primary_if = primary_if_get_selected(bat_priv);
319         if (!primary_if) {
320                 ret = seq_printf(seq, "BATMAN mesh %s disabled - "
321                                  "please specify interfaces to enable it\n",
322                                  net_dev->name);
323                 goto out;
324         }
325
326         if (primary_if->if_status != IF_ACTIVE) {
327                 ret = seq_printf(seq, "BATMAN mesh %s disabled - "
328                                  "primary interface not active\n",
329                                  net_dev->name);
330                 goto out;
331         }
332
333         seq_printf(seq, "Locally retrieved addresses (from %s) "
334                    "announced via TT (TTVN: %u):\n",
335                    net_dev->name, (uint8_t)atomic_read(&bat_priv->ttvn));
336
337         buf_size = 1;
338         /* Estimate length for: " * xx:xx:xx:xx:xx:xx\n" */
339         for (i = 0; i < hash->size; i++) {
340                 head = &hash->table[i];
341
342                 rcu_read_lock();
343                 __hlist_for_each_rcu(node, head)
344                         buf_size += 21;
345                 rcu_read_unlock();
346         }
347
348         buff = kmalloc(buf_size, GFP_ATOMIC);
349         if (!buff) {
350                 ret = -ENOMEM;
351                 goto out;
352         }
353
354         buff[0] = '\0';
355         pos = 0;
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_local_entry, node,
362                                          head, hash_entry) {
363                         pos += snprintf(buff + pos, 22, " * %pM\n",
364                                         tt_local_entry->addr);
365                 }
366                 rcu_read_unlock();
367         }
368
369         seq_printf(seq, "%s", buff);
370         kfree(buff);
371 out:
372         if (primary_if)
373                 hardif_free_ref(primary_if);
374         return ret;
375 }
376
377 static void tt_local_set_pending(struct bat_priv *bat_priv,
378                                  struct tt_local_entry *tt_local_entry,
379                                  uint16_t flags)
380 {
381         tt_local_event(bat_priv, tt_local_entry->addr,
382                        tt_local_entry->flags | flags);
383
384         /* The local client has to be merked as "pending to be removed" but has
385          * to be kept in the table in order to send it in an full tables
386          * response issued before the net ttvn increment (consistency check) */
387         tt_local_entry->flags |= TT_CLIENT_PENDING;
388 }
389
390 void tt_local_remove(struct bat_priv *bat_priv, const uint8_t *addr,
391                      const char *message, bool roaming)
392 {
393         struct tt_local_entry *tt_local_entry = NULL;
394
395         tt_local_entry = tt_local_hash_find(bat_priv, addr);
396         if (!tt_local_entry)
397                 goto out;
398
399         tt_local_set_pending(bat_priv, tt_local_entry, TT_CLIENT_DEL |
400                              (roaming ? TT_CLIENT_ROAM : NO_FLAGS));
401
402         bat_dbg(DBG_TT, bat_priv, "Local tt entry (%pM) pending to be removed: "
403                 "%s\n", tt_local_entry->addr, message);
404 out:
405         if (tt_local_entry)
406                 tt_local_entry_free_ref(tt_local_entry);
407 }
408
409 static void tt_local_purge(struct bat_priv *bat_priv)
410 {
411         struct hashtable_t *hash = bat_priv->tt_local_hash;
412         struct tt_local_entry *tt_local_entry;
413         struct hlist_node *node, *node_tmp;
414         struct hlist_head *head;
415         spinlock_t *list_lock; /* protects write access to the hash lists */
416         int i;
417
418         for (i = 0; i < hash->size; i++) {
419                 head = &hash->table[i];
420                 list_lock = &hash->list_locks[i];
421
422                 spin_lock_bh(list_lock);
423                 hlist_for_each_entry_safe(tt_local_entry, node, node_tmp,
424                                           head, hash_entry) {
425                         if (tt_local_entry->flags & TT_CLIENT_NOPURGE)
426                                 continue;
427
428                         /* entry already marked for deletion */
429                         if (tt_local_entry->flags & TT_CLIENT_PENDING)
430                                 continue;
431
432                         if (!is_out_of_time(tt_local_entry->last_seen,
433                                             TT_LOCAL_TIMEOUT * 1000))
434                                 continue;
435
436                         tt_local_set_pending(bat_priv, tt_local_entry,
437                                              TT_CLIENT_DEL);
438                         bat_dbg(DBG_TT, bat_priv, "Local tt entry (%pM) "
439                                 "pending to be removed: timed out\n",
440                                 tt_local_entry->addr);
441                 }
442                 spin_unlock_bh(list_lock);
443         }
444
445 }
446
447 static void tt_local_table_free(struct bat_priv *bat_priv)
448 {
449         struct hashtable_t *hash;
450         spinlock_t *list_lock; /* protects write access to the hash lists */
451         struct tt_local_entry *tt_local_entry;
452         struct hlist_node *node, *node_tmp;
453         struct hlist_head *head;
454         int i;
455
456         if (!bat_priv->tt_local_hash)
457                 return;
458
459         hash = bat_priv->tt_local_hash;
460
461         for (i = 0; i < hash->size; i++) {
462                 head = &hash->table[i];
463                 list_lock = &hash->list_locks[i];
464
465                 spin_lock_bh(list_lock);
466                 hlist_for_each_entry_safe(tt_local_entry, node, node_tmp,
467                                           head, hash_entry) {
468                         hlist_del_rcu(node);
469                         tt_local_entry_free_ref(tt_local_entry);
470                 }
471                 spin_unlock_bh(list_lock);
472         }
473
474         hash_destroy(hash);
475
476         bat_priv->tt_local_hash = NULL;
477 }
478
479 static int tt_global_init(struct bat_priv *bat_priv)
480 {
481         if (bat_priv->tt_global_hash)
482                 return 1;
483
484         bat_priv->tt_global_hash = hash_new(1024);
485
486         if (!bat_priv->tt_global_hash)
487                 return 0;
488
489         return 1;
490 }
491
492 static void tt_changes_list_free(struct bat_priv *bat_priv)
493 {
494         struct tt_change_node *entry, *safe;
495
496         spin_lock_bh(&bat_priv->tt_changes_list_lock);
497
498         list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list,
499                                  list) {
500                 list_del(&entry->list);
501                 kfree(entry);
502         }
503
504         atomic_set(&bat_priv->tt_local_changes, 0);
505         spin_unlock_bh(&bat_priv->tt_changes_list_lock);
506 }
507
508 /* caller must hold orig_node refcount */
509 int tt_global_add(struct bat_priv *bat_priv, struct orig_node *orig_node,
510                   const unsigned char *tt_addr, uint8_t ttvn, bool roaming)
511 {
512         struct tt_global_entry *tt_global_entry;
513         struct orig_node *orig_node_tmp;
514         int ret = 0;
515
516         tt_global_entry = tt_global_hash_find(bat_priv, tt_addr);
517
518         if (!tt_global_entry) {
519                 tt_global_entry =
520                         kmalloc(sizeof(*tt_global_entry),
521                                 GFP_ATOMIC);
522                 if (!tt_global_entry)
523                         goto out;
524
525                 memcpy(tt_global_entry->addr, tt_addr, ETH_ALEN);
526                 /* Assign the new orig_node */
527                 atomic_inc(&orig_node->refcount);
528                 tt_global_entry->orig_node = orig_node;
529                 tt_global_entry->ttvn = ttvn;
530                 tt_global_entry->flags = NO_FLAGS;
531                 tt_global_entry->roam_at = 0;
532                 atomic_set(&tt_global_entry->refcount, 2);
533
534                 hash_add(bat_priv->tt_global_hash, compare_gtt,
535                          choose_orig, tt_global_entry,
536                          &tt_global_entry->hash_entry);
537                 atomic_inc(&orig_node->tt_size);
538         } else {
539                 if (tt_global_entry->orig_node != orig_node) {
540                         atomic_dec(&tt_global_entry->orig_node->tt_size);
541                         orig_node_tmp = tt_global_entry->orig_node;
542                         atomic_inc(&orig_node->refcount);
543                         tt_global_entry->orig_node = orig_node;
544                         orig_node_free_ref(orig_node_tmp);
545                         atomic_inc(&orig_node->tt_size);
546                 }
547                 tt_global_entry->ttvn = ttvn;
548                 tt_global_entry->flags = NO_FLAGS;
549                 tt_global_entry->roam_at = 0;
550         }
551
552         bat_dbg(DBG_TT, bat_priv,
553                 "Creating new global tt entry: %pM (via %pM)\n",
554                 tt_global_entry->addr, orig_node->orig);
555
556         /* remove address from local hash if present */
557         tt_local_remove(bat_priv, tt_global_entry->addr,
558                         "global tt received", roaming);
559         ret = 1;
560 out:
561         if (tt_global_entry)
562                 tt_global_entry_free_ref(tt_global_entry);
563         return ret;
564 }
565
566 int tt_global_seq_print_text(struct seq_file *seq, void *offset)
567 {
568         struct net_device *net_dev = (struct net_device *)seq->private;
569         struct bat_priv *bat_priv = netdev_priv(net_dev);
570         struct hashtable_t *hash = bat_priv->tt_global_hash;
571         struct tt_global_entry *tt_global_entry;
572         struct hard_iface *primary_if;
573         struct hlist_node *node;
574         struct hlist_head *head;
575         size_t buf_size, pos;
576         char *buff;
577         int i, ret = 0;
578
579         primary_if = primary_if_get_selected(bat_priv);
580         if (!primary_if) {
581                 ret = seq_printf(seq, "BATMAN mesh %s disabled - please "
582                                  "specify interfaces to enable it\n",
583                                  net_dev->name);
584                 goto out;
585         }
586
587         if (primary_if->if_status != IF_ACTIVE) {
588                 ret = seq_printf(seq, "BATMAN mesh %s disabled - "
589                                  "primary interface not active\n",
590                                  net_dev->name);
591                 goto out;
592         }
593
594         seq_printf(seq,
595                    "Globally announced TT entries received via the mesh %s\n",
596                    net_dev->name);
597         seq_printf(seq, "       %-13s %s       %-15s %s\n",
598                    "Client", "(TTVN)", "Originator", "(Curr TTVN)");
599
600         buf_size = 1;
601         /* Estimate length for: " * xx:xx:xx:xx:xx:xx (ttvn) via
602          * xx:xx:xx:xx:xx:xx (cur_ttvn)\n"*/
603         for (i = 0; i < hash->size; i++) {
604                 head = &hash->table[i];
605
606                 rcu_read_lock();
607                 __hlist_for_each_rcu(node, head)
608                         buf_size += 59;
609                 rcu_read_unlock();
610         }
611
612         buff = kmalloc(buf_size, GFP_ATOMIC);
613         if (!buff) {
614                 ret = -ENOMEM;
615                 goto out;
616         }
617
618         buff[0] = '\0';
619         pos = 0;
620
621         for (i = 0; i < hash->size; i++) {
622                 head = &hash->table[i];
623
624                 rcu_read_lock();
625                 hlist_for_each_entry_rcu(tt_global_entry, node,
626                                          head, hash_entry) {
627                         pos += snprintf(buff + pos, 61,
628                                         " * %pM  (%3u) via %pM     (%3u)\n",
629                                         tt_global_entry->addr,
630                                         tt_global_entry->ttvn,
631                                         tt_global_entry->orig_node->orig,
632                                         (uint8_t) atomic_read(
633                                                 &tt_global_entry->orig_node->
634                                                 last_ttvn));
635                 }
636                 rcu_read_unlock();
637         }
638
639         seq_printf(seq, "%s", buff);
640         kfree(buff);
641 out:
642         if (primary_if)
643                 hardif_free_ref(primary_if);
644         return ret;
645 }
646
647 static void _tt_global_del(struct bat_priv *bat_priv,
648                            struct tt_global_entry *tt_global_entry,
649                            const char *message)
650 {
651         if (!tt_global_entry)
652                 goto out;
653
654         bat_dbg(DBG_TT, bat_priv,
655                 "Deleting global tt entry %pM (via %pM): %s\n",
656                 tt_global_entry->addr, tt_global_entry->orig_node->orig,
657                 message);
658
659         atomic_dec(&tt_global_entry->orig_node->tt_size);
660
661         hash_remove(bat_priv->tt_global_hash, compare_gtt, choose_orig,
662                     tt_global_entry->addr);
663 out:
664         if (tt_global_entry)
665                 tt_global_entry_free_ref(tt_global_entry);
666 }
667
668 void tt_global_del(struct bat_priv *bat_priv,
669                    struct orig_node *orig_node, const unsigned char *addr,
670                    const char *message, bool roaming)
671 {
672         struct tt_global_entry *tt_global_entry = NULL;
673
674         tt_global_entry = tt_global_hash_find(bat_priv, addr);
675         if (!tt_global_entry)
676                 goto out;
677
678         if (tt_global_entry->orig_node == orig_node) {
679                 if (roaming) {
680                         tt_global_entry->flags |= TT_CLIENT_ROAM;
681                         tt_global_entry->roam_at = jiffies;
682                         goto out;
683                 }
684                 _tt_global_del(bat_priv, tt_global_entry, message);
685         }
686 out:
687         if (tt_global_entry)
688                 tt_global_entry_free_ref(tt_global_entry);
689 }
690
691 void tt_global_del_orig(struct bat_priv *bat_priv,
692                         struct orig_node *orig_node, const char *message)
693 {
694         struct tt_global_entry *tt_global_entry;
695         int i;
696         struct hashtable_t *hash = bat_priv->tt_global_hash;
697         struct hlist_node *node, *safe;
698         struct hlist_head *head;
699         spinlock_t *list_lock; /* protects write access to the hash lists */
700
701         for (i = 0; i < hash->size; i++) {
702                 head = &hash->table[i];
703                 list_lock = &hash->list_locks[i];
704
705                 spin_lock_bh(list_lock);
706                 hlist_for_each_entry_safe(tt_global_entry, node, safe,
707                                          head, hash_entry) {
708                         if (tt_global_entry->orig_node == orig_node) {
709                                 bat_dbg(DBG_TT, bat_priv,
710                                         "Deleting global tt entry %pM "
711                                         "(via %pM): originator time out\n",
712                                         tt_global_entry->addr,
713                                         tt_global_entry->orig_node->orig);
714                                 hlist_del_rcu(node);
715                                 tt_global_entry_free_ref(tt_global_entry);
716                         }
717                 }
718                 spin_unlock_bh(list_lock);
719         }
720         atomic_set(&orig_node->tt_size, 0);
721 }
722
723 static void tt_global_roam_purge(struct bat_priv *bat_priv)
724 {
725         struct hashtable_t *hash = bat_priv->tt_global_hash;
726         struct tt_global_entry *tt_global_entry;
727         struct hlist_node *node, *node_tmp;
728         struct hlist_head *head;
729         spinlock_t *list_lock; /* protects write access to the hash lists */
730         int i;
731
732         for (i = 0; i < hash->size; i++) {
733                 head = &hash->table[i];
734                 list_lock = &hash->list_locks[i];
735
736                 spin_lock_bh(list_lock);
737                 hlist_for_each_entry_safe(tt_global_entry, node, node_tmp,
738                                           head, hash_entry) {
739                         if (!(tt_global_entry->flags & TT_CLIENT_ROAM))
740                                 continue;
741                         if (!is_out_of_time(tt_global_entry->roam_at,
742                                             TT_CLIENT_ROAM_TIMEOUT * 1000))
743                                 continue;
744
745                         bat_dbg(DBG_TT, bat_priv, "Deleting global "
746                                 "tt entry (%pM): Roaming timeout\n",
747                                 tt_global_entry->addr);
748                         atomic_dec(&tt_global_entry->orig_node->tt_size);
749                         hlist_del_rcu(node);
750                         tt_global_entry_free_ref(tt_global_entry);
751                 }
752                 spin_unlock_bh(list_lock);
753         }
754
755 }
756
757 static void tt_global_table_free(struct bat_priv *bat_priv)
758 {
759         struct hashtable_t *hash;
760         spinlock_t *list_lock; /* protects write access to the hash lists */
761         struct tt_global_entry *tt_global_entry;
762         struct hlist_node *node, *node_tmp;
763         struct hlist_head *head;
764         int i;
765
766         if (!bat_priv->tt_global_hash)
767                 return;
768
769         hash = bat_priv->tt_global_hash;
770
771         for (i = 0; i < hash->size; i++) {
772                 head = &hash->table[i];
773                 list_lock = &hash->list_locks[i];
774
775                 spin_lock_bh(list_lock);
776                 hlist_for_each_entry_safe(tt_global_entry, node, node_tmp,
777                                           head, hash_entry) {
778                         hlist_del_rcu(node);
779                         tt_global_entry_free_ref(tt_global_entry);
780                 }
781                 spin_unlock_bh(list_lock);
782         }
783
784         hash_destroy(hash);
785
786         bat_priv->tt_global_hash = NULL;
787 }
788
789 struct orig_node *transtable_search(struct bat_priv *bat_priv,
790                                     const uint8_t *addr)
791 {
792         struct tt_global_entry *tt_global_entry;
793         struct orig_node *orig_node = NULL;
794
795         tt_global_entry = tt_global_hash_find(bat_priv, addr);
796
797         if (!tt_global_entry)
798                 goto out;
799
800         if (!atomic_inc_not_zero(&tt_global_entry->orig_node->refcount))
801                 goto free_tt;
802
803         /* A global client marked as PENDING has already moved from that
804          * originator */
805         if (tt_global_entry->flags & TT_CLIENT_PENDING)
806                 goto free_tt;
807
808         orig_node = tt_global_entry->orig_node;
809
810 free_tt:
811         tt_global_entry_free_ref(tt_global_entry);
812 out:
813         return orig_node;
814 }
815
816 /* Calculates the checksum of the local table of a given orig_node */
817 uint16_t tt_global_crc(struct bat_priv *bat_priv, struct orig_node *orig_node)
818 {
819         uint16_t total = 0, total_one;
820         struct hashtable_t *hash = bat_priv->tt_global_hash;
821         struct tt_global_entry *tt_global_entry;
822         struct hlist_node *node;
823         struct hlist_head *head;
824         int i, j;
825
826         for (i = 0; i < hash->size; i++) {
827                 head = &hash->table[i];
828
829                 rcu_read_lock();
830                 hlist_for_each_entry_rcu(tt_global_entry, node,
831                                          head, hash_entry) {
832                         if (compare_eth(tt_global_entry->orig_node,
833                                         orig_node)) {
834                                 /* Roaming clients are in the global table for
835                                  * consistency only. They don't have to be
836                                  * taken into account while computing the
837                                  * global crc */
838                                 if (tt_global_entry->flags & TT_CLIENT_ROAM)
839                                         continue;
840                                 total_one = 0;
841                                 for (j = 0; j < ETH_ALEN; j++)
842                                         total_one = crc16_byte(total_one,
843                                                 tt_global_entry->addr[j]);
844                                 total ^= total_one;
845                         }
846                 }
847                 rcu_read_unlock();
848         }
849
850         return total;
851 }
852
853 /* Calculates the checksum of the local table */
854 uint16_t tt_local_crc(struct bat_priv *bat_priv)
855 {
856         uint16_t total = 0, total_one;
857         struct hashtable_t *hash = bat_priv->tt_local_hash;
858         struct tt_local_entry *tt_local_entry;
859         struct hlist_node *node;
860         struct hlist_head *head;
861         int i, j;
862
863         for (i = 0; i < hash->size; i++) {
864                 head = &hash->table[i];
865
866                 rcu_read_lock();
867                 hlist_for_each_entry_rcu(tt_local_entry, node,
868                                          head, hash_entry) {
869                         /* not yet committed clients have not to be taken into
870                          * account while computing the CRC */
871                         if (tt_local_entry->flags & TT_CLIENT_NEW)
872                                 continue;
873                         total_one = 0;
874                         for (j = 0; j < ETH_ALEN; j++)
875                                 total_one = crc16_byte(total_one,
876                                                    tt_local_entry->addr[j]);
877                         total ^= total_one;
878                 }
879                 rcu_read_unlock();
880         }
881
882         return total;
883 }
884
885 static void tt_req_list_free(struct bat_priv *bat_priv)
886 {
887         struct tt_req_node *node, *safe;
888
889         spin_lock_bh(&bat_priv->tt_req_list_lock);
890
891         list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
892                 list_del(&node->list);
893                 kfree(node);
894         }
895
896         spin_unlock_bh(&bat_priv->tt_req_list_lock);
897 }
898
899 void tt_save_orig_buffer(struct bat_priv *bat_priv, struct orig_node *orig_node,
900                          const unsigned char *tt_buff, uint8_t tt_num_changes)
901 {
902         uint16_t tt_buff_len = tt_len(tt_num_changes);
903
904         /* Replace the old buffer only if I received something in the
905          * last OGM (the OGM could carry no changes) */
906         spin_lock_bh(&orig_node->tt_buff_lock);
907         if (tt_buff_len > 0) {
908                 kfree(orig_node->tt_buff);
909                 orig_node->tt_buff_len = 0;
910                 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
911                 if (orig_node->tt_buff) {
912                         memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
913                         orig_node->tt_buff_len = tt_buff_len;
914                 }
915         }
916         spin_unlock_bh(&orig_node->tt_buff_lock);
917 }
918
919 static void tt_req_purge(struct bat_priv *bat_priv)
920 {
921         struct tt_req_node *node, *safe;
922
923         spin_lock_bh(&bat_priv->tt_req_list_lock);
924         list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
925                 if (is_out_of_time(node->issued_at,
926                     TT_REQUEST_TIMEOUT * 1000)) {
927                         list_del(&node->list);
928                         kfree(node);
929                 }
930         }
931         spin_unlock_bh(&bat_priv->tt_req_list_lock);
932 }
933
934 /* returns the pointer to the new tt_req_node struct if no request
935  * has already been issued for this orig_node, NULL otherwise */
936 static struct tt_req_node *new_tt_req_node(struct bat_priv *bat_priv,
937                                           struct orig_node *orig_node)
938 {
939         struct tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
940
941         spin_lock_bh(&bat_priv->tt_req_list_lock);
942         list_for_each_entry(tt_req_node_tmp, &bat_priv->tt_req_list, list) {
943                 if (compare_eth(tt_req_node_tmp, orig_node) &&
944                     !is_out_of_time(tt_req_node_tmp->issued_at,
945                                     TT_REQUEST_TIMEOUT * 1000))
946                         goto unlock;
947         }
948
949         tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
950         if (!tt_req_node)
951                 goto unlock;
952
953         memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN);
954         tt_req_node->issued_at = jiffies;
955
956         list_add(&tt_req_node->list, &bat_priv->tt_req_list);
957 unlock:
958         spin_unlock_bh(&bat_priv->tt_req_list_lock);
959         return tt_req_node;
960 }
961
962 /* data_ptr is useless here, but has to be kept to respect the prototype */
963 static int tt_local_valid_entry(const void *entry_ptr, const void *data_ptr)
964 {
965         const struct tt_local_entry *tt_local_entry = entry_ptr;
966
967         if (tt_local_entry->flags & TT_CLIENT_NEW)
968                 return 0;
969         return 1;
970 }
971
972 static int tt_global_valid_entry(const void *entry_ptr, const void *data_ptr)
973 {
974         const struct tt_global_entry *tt_global_entry = entry_ptr;
975         const struct orig_node *orig_node = data_ptr;
976
977         if (tt_global_entry->flags & TT_CLIENT_ROAM)
978                 return 0;
979
980         return (tt_global_entry->orig_node == orig_node);
981 }
982
983 static struct sk_buff *tt_response_fill_table(uint16_t tt_len, uint8_t ttvn,
984                                               struct hashtable_t *hash,
985                                               struct hard_iface *primary_if,
986                                               int (*valid_cb)(const void *,
987                                                               const void *),
988                                               void *cb_data)
989 {
990         struct tt_local_entry *tt_local_entry;
991         struct tt_query_packet *tt_response;
992         struct tt_change *tt_change;
993         struct hlist_node *node;
994         struct hlist_head *head;
995         struct sk_buff *skb = NULL;
996         uint16_t tt_tot, tt_count;
997         ssize_t tt_query_size = sizeof(struct tt_query_packet);
998         int i;
999
1000         if (tt_query_size + tt_len > primary_if->soft_iface->mtu) {
1001                 tt_len = primary_if->soft_iface->mtu - tt_query_size;
1002                 tt_len -= tt_len % sizeof(struct tt_change);
1003         }
1004         tt_tot = tt_len / sizeof(struct tt_change);
1005
1006         skb = dev_alloc_skb(tt_query_size + tt_len + ETH_HLEN);
1007         if (!skb)
1008                 goto out;
1009
1010         skb_reserve(skb, ETH_HLEN);
1011         tt_response = (struct tt_query_packet *)skb_put(skb,
1012                                                      tt_query_size + tt_len);
1013         tt_response->ttvn = ttvn;
1014
1015         tt_change = (struct tt_change *)(skb->data + tt_query_size);
1016         tt_count = 0;
1017
1018         rcu_read_lock();
1019         for (i = 0; i < hash->size; i++) {
1020                 head = &hash->table[i];
1021
1022                 hlist_for_each_entry_rcu(tt_local_entry, node,
1023                                          head, hash_entry) {
1024                         if (tt_count == tt_tot)
1025                                 break;
1026
1027                         if ((valid_cb) && (!valid_cb(tt_local_entry, cb_data)))
1028                                 continue;
1029
1030                         memcpy(tt_change->addr, tt_local_entry->addr, ETH_ALEN);
1031                         tt_change->flags = NO_FLAGS;
1032
1033                         tt_count++;
1034                         tt_change++;
1035                 }
1036         }
1037         rcu_read_unlock();
1038
1039         /* store in the message the number of entries we have successfully
1040          * copied */
1041         tt_response->tt_data = htons(tt_count);
1042
1043 out:
1044         return skb;
1045 }
1046
1047 int send_tt_request(struct bat_priv *bat_priv, struct orig_node *dst_orig_node,
1048                     uint8_t ttvn, uint16_t tt_crc, bool full_table)
1049 {
1050         struct sk_buff *skb = NULL;
1051         struct tt_query_packet *tt_request;
1052         struct neigh_node *neigh_node = NULL;
1053         struct hard_iface *primary_if;
1054         struct tt_req_node *tt_req_node = NULL;
1055         int ret = 1;
1056
1057         primary_if = primary_if_get_selected(bat_priv);
1058         if (!primary_if)
1059                 goto out;
1060
1061         /* The new tt_req will be issued only if I'm not waiting for a
1062          * reply from the same orig_node yet */
1063         tt_req_node = new_tt_req_node(bat_priv, dst_orig_node);
1064         if (!tt_req_node)
1065                 goto out;
1066
1067         skb = dev_alloc_skb(sizeof(struct tt_query_packet) + ETH_HLEN);
1068         if (!skb)
1069                 goto out;
1070
1071         skb_reserve(skb, ETH_HLEN);
1072
1073         tt_request = (struct tt_query_packet *)skb_put(skb,
1074                                 sizeof(struct tt_query_packet));
1075
1076         tt_request->packet_type = BAT_TT_QUERY;
1077         tt_request->version = COMPAT_VERSION;
1078         memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1079         memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN);
1080         tt_request->ttl = TTL;
1081         tt_request->ttvn = ttvn;
1082         tt_request->tt_data = tt_crc;
1083         tt_request->flags = TT_REQUEST;
1084
1085         if (full_table)
1086                 tt_request->flags |= TT_FULL_TABLE;
1087
1088         neigh_node = orig_node_get_router(dst_orig_node);
1089         if (!neigh_node)
1090                 goto out;
1091
1092         bat_dbg(DBG_TT, bat_priv, "Sending TT_REQUEST to %pM via %pM "
1093                 "[%c]\n", dst_orig_node->orig, neigh_node->addr,
1094                 (full_table ? 'F' : '.'));
1095
1096         send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1097         ret = 0;
1098
1099 out:
1100         if (neigh_node)
1101                 neigh_node_free_ref(neigh_node);
1102         if (primary_if)
1103                 hardif_free_ref(primary_if);
1104         if (ret)
1105                 kfree_skb(skb);
1106         if (ret && tt_req_node) {
1107                 spin_lock_bh(&bat_priv->tt_req_list_lock);
1108                 list_del(&tt_req_node->list);
1109                 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1110                 kfree(tt_req_node);
1111         }
1112         return ret;
1113 }
1114
1115 static bool send_other_tt_response(struct bat_priv *bat_priv,
1116                                    struct tt_query_packet *tt_request)
1117 {
1118         struct orig_node *req_dst_orig_node = NULL, *res_dst_orig_node = NULL;
1119         struct neigh_node *neigh_node = NULL;
1120         struct hard_iface *primary_if = NULL;
1121         uint8_t orig_ttvn, req_ttvn, ttvn;
1122         int ret = false;
1123         unsigned char *tt_buff;
1124         bool full_table;
1125         uint16_t tt_len, tt_tot;
1126         struct sk_buff *skb = NULL;
1127         struct tt_query_packet *tt_response;
1128
1129         bat_dbg(DBG_TT, bat_priv,
1130                 "Received TT_REQUEST from %pM for "
1131                 "ttvn: %u (%pM) [%c]\n", tt_request->src,
1132                 tt_request->ttvn, tt_request->dst,
1133                 (tt_request->flags & TT_FULL_TABLE ? 'F' : '.'));
1134
1135         /* Let's get the orig node of the REAL destination */
1136         req_dst_orig_node = get_orig_node(bat_priv, tt_request->dst);
1137         if (!req_dst_orig_node)
1138                 goto out;
1139
1140         res_dst_orig_node = get_orig_node(bat_priv, tt_request->src);
1141         if (!res_dst_orig_node)
1142                 goto out;
1143
1144         neigh_node = orig_node_get_router(res_dst_orig_node);
1145         if (!neigh_node)
1146                 goto out;
1147
1148         primary_if = primary_if_get_selected(bat_priv);
1149         if (!primary_if)
1150                 goto out;
1151
1152         orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1153         req_ttvn = tt_request->ttvn;
1154
1155         /* I have not the requested data */
1156         if (orig_ttvn != req_ttvn ||
1157             tt_request->tt_data != req_dst_orig_node->tt_crc)
1158                 goto out;
1159
1160         /* If it has explicitly been requested the full table */
1161         if (tt_request->flags & TT_FULL_TABLE ||
1162             !req_dst_orig_node->tt_buff)
1163                 full_table = true;
1164         else
1165                 full_table = false;
1166
1167         /* In this version, fragmentation is not implemented, then
1168          * I'll send only one packet with as much TT entries as I can */
1169         if (!full_table) {
1170                 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
1171                 tt_len = req_dst_orig_node->tt_buff_len;
1172                 tt_tot = tt_len / sizeof(struct tt_change);
1173
1174                 skb = dev_alloc_skb(sizeof(struct tt_query_packet) +
1175                                     tt_len + ETH_HLEN);
1176                 if (!skb)
1177                         goto unlock;
1178
1179                 skb_reserve(skb, ETH_HLEN);
1180                 tt_response = (struct tt_query_packet *)skb_put(skb,
1181                                 sizeof(struct tt_query_packet) + tt_len);
1182                 tt_response->ttvn = req_ttvn;
1183                 tt_response->tt_data = htons(tt_tot);
1184
1185                 tt_buff = skb->data + sizeof(struct tt_query_packet);
1186                 /* Copy the last orig_node's OGM buffer */
1187                 memcpy(tt_buff, req_dst_orig_node->tt_buff,
1188                        req_dst_orig_node->tt_buff_len);
1189
1190                 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1191         } else {
1192                 tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size) *
1193                                                 sizeof(struct tt_change);
1194                 ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1195
1196                 skb = tt_response_fill_table(tt_len, ttvn,
1197                                              bat_priv->tt_global_hash,
1198                                              primary_if, tt_global_valid_entry,
1199                                              req_dst_orig_node);
1200                 if (!skb)
1201                         goto out;
1202
1203                 tt_response = (struct tt_query_packet *)skb->data;
1204         }
1205
1206         tt_response->packet_type = BAT_TT_QUERY;
1207         tt_response->version = COMPAT_VERSION;
1208         tt_response->ttl = TTL;
1209         memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN);
1210         memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1211         tt_response->flags = TT_RESPONSE;
1212
1213         if (full_table)
1214                 tt_response->flags |= TT_FULL_TABLE;
1215
1216         bat_dbg(DBG_TT, bat_priv,
1217                 "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n",
1218                 res_dst_orig_node->orig, neigh_node->addr,
1219                 req_dst_orig_node->orig, req_ttvn);
1220
1221         send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1222         ret = true;
1223         goto out;
1224
1225 unlock:
1226         spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1227
1228 out:
1229         if (res_dst_orig_node)
1230                 orig_node_free_ref(res_dst_orig_node);
1231         if (req_dst_orig_node)
1232                 orig_node_free_ref(req_dst_orig_node);
1233         if (neigh_node)
1234                 neigh_node_free_ref(neigh_node);
1235         if (primary_if)
1236                 hardif_free_ref(primary_if);
1237         if (!ret)
1238                 kfree_skb(skb);
1239         return ret;
1240
1241 }
1242 static bool send_my_tt_response(struct bat_priv *bat_priv,
1243                                 struct tt_query_packet *tt_request)
1244 {
1245         struct orig_node *orig_node = NULL;
1246         struct neigh_node *neigh_node = NULL;
1247         struct hard_iface *primary_if = NULL;
1248         uint8_t my_ttvn, req_ttvn, ttvn;
1249         int ret = false;
1250         unsigned char *tt_buff;
1251         bool full_table;
1252         uint16_t tt_len, tt_tot;
1253         struct sk_buff *skb = NULL;
1254         struct tt_query_packet *tt_response;
1255
1256         bat_dbg(DBG_TT, bat_priv,
1257                 "Received TT_REQUEST from %pM for "
1258                 "ttvn: %u (me) [%c]\n", tt_request->src,
1259                 tt_request->ttvn,
1260                 (tt_request->flags & TT_FULL_TABLE ? 'F' : '.'));
1261
1262
1263         my_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
1264         req_ttvn = tt_request->ttvn;
1265
1266         orig_node = get_orig_node(bat_priv, tt_request->src);
1267         if (!orig_node)
1268                 goto out;
1269
1270         neigh_node = orig_node_get_router(orig_node);
1271         if (!neigh_node)
1272                 goto out;
1273
1274         primary_if = primary_if_get_selected(bat_priv);
1275         if (!primary_if)
1276                 goto out;
1277
1278         /* If the full table has been explicitly requested or the gap
1279          * is too big send the whole local translation table */
1280         if (tt_request->flags & TT_FULL_TABLE || my_ttvn != req_ttvn ||
1281             !bat_priv->tt_buff)
1282                 full_table = true;
1283         else
1284                 full_table = false;
1285
1286         /* In this version, fragmentation is not implemented, then
1287          * I'll send only one packet with as much TT entries as I can */
1288         if (!full_table) {
1289                 spin_lock_bh(&bat_priv->tt_buff_lock);
1290                 tt_len = bat_priv->tt_buff_len;
1291                 tt_tot = tt_len / sizeof(struct tt_change);
1292
1293                 skb = dev_alloc_skb(sizeof(struct tt_query_packet) +
1294                                     tt_len + ETH_HLEN);
1295                 if (!skb)
1296                         goto unlock;
1297
1298                 skb_reserve(skb, ETH_HLEN);
1299                 tt_response = (struct tt_query_packet *)skb_put(skb,
1300                                 sizeof(struct tt_query_packet) + tt_len);
1301                 tt_response->ttvn = req_ttvn;
1302                 tt_response->tt_data = htons(tt_tot);
1303
1304                 tt_buff = skb->data + sizeof(struct tt_query_packet);
1305                 memcpy(tt_buff, bat_priv->tt_buff,
1306                        bat_priv->tt_buff_len);
1307                 spin_unlock_bh(&bat_priv->tt_buff_lock);
1308         } else {
1309                 tt_len = (uint16_t)atomic_read(&bat_priv->num_local_tt) *
1310                                                 sizeof(struct tt_change);
1311                 ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
1312
1313                 skb = tt_response_fill_table(tt_len, ttvn,
1314                                              bat_priv->tt_local_hash,
1315                                              primary_if, tt_local_valid_entry,
1316                                              NULL);
1317                 if (!skb)
1318                         goto out;
1319
1320                 tt_response = (struct tt_query_packet *)skb->data;
1321         }
1322
1323         tt_response->packet_type = BAT_TT_QUERY;
1324         tt_response->version = COMPAT_VERSION;
1325         tt_response->ttl = TTL;
1326         memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1327         memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1328         tt_response->flags = TT_RESPONSE;
1329
1330         if (full_table)
1331                 tt_response->flags |= TT_FULL_TABLE;
1332
1333         bat_dbg(DBG_TT, bat_priv,
1334                 "Sending TT_RESPONSE to %pM via %pM [%c]\n",
1335                 orig_node->orig, neigh_node->addr,
1336                 (tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
1337
1338         send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1339         ret = true;
1340         goto out;
1341
1342 unlock:
1343         spin_unlock_bh(&bat_priv->tt_buff_lock);
1344 out:
1345         if (orig_node)
1346                 orig_node_free_ref(orig_node);
1347         if (neigh_node)
1348                 neigh_node_free_ref(neigh_node);
1349         if (primary_if)
1350                 hardif_free_ref(primary_if);
1351         if (!ret)
1352                 kfree_skb(skb);
1353         /* This packet was for me, so it doesn't need to be re-routed */
1354         return true;
1355 }
1356
1357 bool send_tt_response(struct bat_priv *bat_priv,
1358                       struct tt_query_packet *tt_request)
1359 {
1360         if (is_my_mac(tt_request->dst))
1361                 return send_my_tt_response(bat_priv, tt_request);
1362         else
1363                 return send_other_tt_response(bat_priv, tt_request);
1364 }
1365
1366 static void _tt_update_changes(struct bat_priv *bat_priv,
1367                                struct orig_node *orig_node,
1368                                struct tt_change *tt_change,
1369                                uint16_t tt_num_changes, uint8_t ttvn)
1370 {
1371         int i;
1372
1373         for (i = 0; i < tt_num_changes; i++) {
1374                 if ((tt_change + i)->flags & TT_CLIENT_DEL)
1375                         tt_global_del(bat_priv, orig_node,
1376                                       (tt_change + i)->addr,
1377                                       "tt removed by changes",
1378                                       (tt_change + i)->flags & TT_CLIENT_ROAM);
1379                 else
1380                         if (!tt_global_add(bat_priv, orig_node,
1381                                            (tt_change + i)->addr, ttvn, false))
1382                                 /* In case of problem while storing a
1383                                  * global_entry, we stop the updating
1384                                  * procedure without committing the
1385                                  * ttvn change. This will avoid to send
1386                                  * corrupted data on tt_request
1387                                  */
1388                                 return;
1389         }
1390 }
1391
1392 static void tt_fill_gtable(struct bat_priv *bat_priv,
1393                            struct tt_query_packet *tt_response)
1394 {
1395         struct orig_node *orig_node = NULL;
1396
1397         orig_node = orig_hash_find(bat_priv, tt_response->src);
1398         if (!orig_node)
1399                 goto out;
1400
1401         /* Purge the old table first.. */
1402         tt_global_del_orig(bat_priv, orig_node, "Received full table");
1403
1404         _tt_update_changes(bat_priv, orig_node,
1405                            (struct tt_change *)(tt_response + 1),
1406                            tt_response->tt_data, tt_response->ttvn);
1407
1408         spin_lock_bh(&orig_node->tt_buff_lock);
1409         kfree(orig_node->tt_buff);
1410         orig_node->tt_buff_len = 0;
1411         orig_node->tt_buff = NULL;
1412         spin_unlock_bh(&orig_node->tt_buff_lock);
1413
1414         atomic_set(&orig_node->last_ttvn, tt_response->ttvn);
1415
1416 out:
1417         if (orig_node)
1418                 orig_node_free_ref(orig_node);
1419 }
1420
1421 void tt_update_changes(struct bat_priv *bat_priv, struct orig_node *orig_node,
1422                        uint16_t tt_num_changes, uint8_t ttvn,
1423                        struct tt_change *tt_change)
1424 {
1425         _tt_update_changes(bat_priv, orig_node, tt_change, tt_num_changes,
1426                            ttvn);
1427
1428         tt_save_orig_buffer(bat_priv, orig_node, (unsigned char *)tt_change,
1429                             tt_num_changes);
1430         atomic_set(&orig_node->last_ttvn, ttvn);
1431 }
1432
1433 bool is_my_client(struct bat_priv *bat_priv, const uint8_t *addr)
1434 {
1435         struct tt_local_entry *tt_local_entry = NULL;
1436         bool ret = false;
1437
1438         tt_local_entry = tt_local_hash_find(bat_priv, addr);
1439         if (!tt_local_entry)
1440                 goto out;
1441         /* Check if the client has been logically deleted (but is kept for
1442          * consistency purpose) */
1443         if (tt_local_entry->flags & TT_CLIENT_PENDING)
1444                 goto out;
1445         ret = true;
1446 out:
1447         if (tt_local_entry)
1448                 tt_local_entry_free_ref(tt_local_entry);
1449         return ret;
1450 }
1451
1452 void handle_tt_response(struct bat_priv *bat_priv,
1453                         struct tt_query_packet *tt_response)
1454 {
1455         struct tt_req_node *node, *safe;
1456         struct orig_node *orig_node = NULL;
1457
1458         bat_dbg(DBG_TT, bat_priv, "Received TT_RESPONSE from %pM for "
1459                 "ttvn %d t_size: %d [%c]\n",
1460                 tt_response->src, tt_response->ttvn,
1461                 tt_response->tt_data,
1462                 (tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
1463
1464         orig_node = orig_hash_find(bat_priv, tt_response->src);
1465         if (!orig_node)
1466                 goto out;
1467
1468         if (tt_response->flags & TT_FULL_TABLE)
1469                 tt_fill_gtable(bat_priv, tt_response);
1470         else
1471                 tt_update_changes(bat_priv, orig_node, tt_response->tt_data,
1472                                   tt_response->ttvn,
1473                                   (struct tt_change *)(tt_response + 1));
1474
1475         /* Delete the tt_req_node from pending tt_requests list */
1476         spin_lock_bh(&bat_priv->tt_req_list_lock);
1477         list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
1478                 if (!compare_eth(node->addr, tt_response->src))
1479                         continue;
1480                 list_del(&node->list);
1481                 kfree(node);
1482         }
1483         spin_unlock_bh(&bat_priv->tt_req_list_lock);
1484
1485         /* Recalculate the CRC for this orig_node and store it */
1486         orig_node->tt_crc = tt_global_crc(bat_priv, orig_node);
1487         /* Roaming phase is over: tables are in sync again. I can
1488          * unset the flag */
1489         orig_node->tt_poss_change = false;
1490 out:
1491         if (orig_node)
1492                 orig_node_free_ref(orig_node);
1493 }
1494
1495 int tt_init(struct bat_priv *bat_priv)
1496 {
1497         if (!tt_local_init(bat_priv))
1498                 return 0;
1499
1500         if (!tt_global_init(bat_priv))
1501                 return 0;
1502
1503         tt_start_timer(bat_priv);
1504
1505         return 1;
1506 }
1507
1508 static void tt_roam_list_free(struct bat_priv *bat_priv)
1509 {
1510         struct tt_roam_node *node, *safe;
1511
1512         spin_lock_bh(&bat_priv->tt_roam_list_lock);
1513
1514         list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
1515                 list_del(&node->list);
1516                 kfree(node);
1517         }
1518
1519         spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1520 }
1521
1522 static void tt_roam_purge(struct bat_priv *bat_priv)
1523 {
1524         struct tt_roam_node *node, *safe;
1525
1526         spin_lock_bh(&bat_priv->tt_roam_list_lock);
1527         list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
1528                 if (!is_out_of_time(node->first_time,
1529                                     ROAMING_MAX_TIME * 1000))
1530                         continue;
1531
1532                 list_del(&node->list);
1533                 kfree(node);
1534         }
1535         spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1536 }
1537
1538 /* This function checks whether the client already reached the
1539  * maximum number of possible roaming phases. In this case the ROAMING_ADV
1540  * will not be sent.
1541  *
1542  * returns true if the ROAMING_ADV can be sent, false otherwise */
1543 static bool tt_check_roam_count(struct bat_priv *bat_priv,
1544                                 uint8_t *client)
1545 {
1546         struct tt_roam_node *tt_roam_node;
1547         bool ret = false;
1548
1549         spin_lock_bh(&bat_priv->tt_roam_list_lock);
1550         /* The new tt_req will be issued only if I'm not waiting for a
1551          * reply from the same orig_node yet */
1552         list_for_each_entry(tt_roam_node, &bat_priv->tt_roam_list, list) {
1553                 if (!compare_eth(tt_roam_node->addr, client))
1554                         continue;
1555
1556                 if (is_out_of_time(tt_roam_node->first_time,
1557                                    ROAMING_MAX_TIME * 1000))
1558                         continue;
1559
1560                 if (!atomic_dec_not_zero(&tt_roam_node->counter))
1561                         /* Sorry, you roamed too many times! */
1562                         goto unlock;
1563                 ret = true;
1564                 break;
1565         }
1566
1567         if (!ret) {
1568                 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
1569                 if (!tt_roam_node)
1570                         goto unlock;
1571
1572                 tt_roam_node->first_time = jiffies;
1573                 atomic_set(&tt_roam_node->counter, ROAMING_MAX_COUNT - 1);
1574                 memcpy(tt_roam_node->addr, client, ETH_ALEN);
1575
1576                 list_add(&tt_roam_node->list, &bat_priv->tt_roam_list);
1577                 ret = true;
1578         }
1579
1580 unlock:
1581         spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1582         return ret;
1583 }
1584
1585 void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client,
1586                    struct orig_node *orig_node)
1587 {
1588         struct neigh_node *neigh_node = NULL;
1589         struct sk_buff *skb = NULL;
1590         struct roam_adv_packet *roam_adv_packet;
1591         int ret = 1;
1592         struct hard_iface *primary_if;
1593
1594         /* before going on we have to check whether the client has
1595          * already roamed to us too many times */
1596         if (!tt_check_roam_count(bat_priv, client))
1597                 goto out;
1598
1599         skb = dev_alloc_skb(sizeof(struct roam_adv_packet) + ETH_HLEN);
1600         if (!skb)
1601                 goto out;
1602
1603         skb_reserve(skb, ETH_HLEN);
1604
1605         roam_adv_packet = (struct roam_adv_packet *)skb_put(skb,
1606                                         sizeof(struct roam_adv_packet));
1607
1608         roam_adv_packet->packet_type = BAT_ROAM_ADV;
1609         roam_adv_packet->version = COMPAT_VERSION;
1610         roam_adv_packet->ttl = TTL;
1611         primary_if = primary_if_get_selected(bat_priv);
1612         if (!primary_if)
1613                 goto out;
1614         memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1615         hardif_free_ref(primary_if);
1616         memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN);
1617         memcpy(roam_adv_packet->client, client, ETH_ALEN);
1618
1619         neigh_node = orig_node_get_router(orig_node);
1620         if (!neigh_node)
1621                 goto out;
1622
1623         bat_dbg(DBG_TT, bat_priv,
1624                 "Sending ROAMING_ADV to %pM (client %pM) via %pM\n",
1625                 orig_node->orig, client, neigh_node->addr);
1626
1627         send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1628         ret = 0;
1629
1630 out:
1631         if (neigh_node)
1632                 neigh_node_free_ref(neigh_node);
1633         if (ret)
1634                 kfree_skb(skb);
1635         return;
1636 }
1637
1638 static void tt_purge(struct work_struct *work)
1639 {
1640         struct delayed_work *delayed_work =
1641                 container_of(work, struct delayed_work, work);
1642         struct bat_priv *bat_priv =
1643                 container_of(delayed_work, struct bat_priv, tt_work);
1644
1645         tt_local_purge(bat_priv);
1646         tt_global_roam_purge(bat_priv);
1647         tt_req_purge(bat_priv);
1648         tt_roam_purge(bat_priv);
1649
1650         tt_start_timer(bat_priv);
1651 }
1652
1653 void tt_free(struct bat_priv *bat_priv)
1654 {
1655         cancel_delayed_work_sync(&bat_priv->tt_work);
1656
1657         tt_local_table_free(bat_priv);
1658         tt_global_table_free(bat_priv);
1659         tt_req_list_free(bat_priv);
1660         tt_changes_list_free(bat_priv);
1661         tt_roam_list_free(bat_priv);
1662
1663         kfree(bat_priv->tt_buff);
1664 }
1665
1666 /* This function will reset the specified flags from all the entries in
1667  * the given hash table and will increment num_local_tt for each involved
1668  * entry */
1669 static void tt_local_reset_flags(struct bat_priv *bat_priv, uint16_t flags)
1670 {
1671         int i;
1672         struct hashtable_t *hash = bat_priv->tt_local_hash;
1673         struct hlist_head *head;
1674         struct hlist_node *node;
1675         struct tt_local_entry *tt_local_entry;
1676
1677         if (!hash)
1678                 return;
1679
1680         for (i = 0; i < hash->size; i++) {
1681                 head = &hash->table[i];
1682
1683                 rcu_read_lock();
1684                 hlist_for_each_entry_rcu(tt_local_entry, node,
1685                                          head, hash_entry) {
1686                         if (!(tt_local_entry->flags & flags))
1687                                 continue;
1688                         tt_local_entry->flags &= ~flags;
1689                         atomic_inc(&bat_priv->num_local_tt);
1690                 }
1691                 rcu_read_unlock();
1692         }
1693
1694 }
1695
1696 /* Purge out all the tt local entries marked with TT_CLIENT_PENDING */
1697 static void tt_local_purge_pending_clients(struct bat_priv *bat_priv)
1698 {
1699         struct hashtable_t *hash = bat_priv->tt_local_hash;
1700         struct tt_local_entry *tt_local_entry;
1701         struct hlist_node *node, *node_tmp;
1702         struct hlist_head *head;
1703         spinlock_t *list_lock; /* protects write access to the hash lists */
1704         int i;
1705
1706         if (!hash)
1707                 return;
1708
1709         for (i = 0; i < hash->size; i++) {
1710                 head = &hash->table[i];
1711                 list_lock = &hash->list_locks[i];
1712
1713                 spin_lock_bh(list_lock);
1714                 hlist_for_each_entry_safe(tt_local_entry, node, node_tmp,
1715                                           head, hash_entry) {
1716                         if (!(tt_local_entry->flags & TT_CLIENT_PENDING))
1717                                 continue;
1718
1719                         bat_dbg(DBG_TT, bat_priv, "Deleting local tt entry "
1720                                 "(%pM): pending\n", tt_local_entry->addr);
1721
1722                         atomic_dec(&bat_priv->num_local_tt);
1723                         hlist_del_rcu(node);
1724                         tt_local_entry_free_ref(tt_local_entry);
1725                 }
1726                 spin_unlock_bh(list_lock);
1727         }
1728
1729 }
1730
1731 void tt_commit_changes(struct bat_priv *bat_priv)
1732 {
1733         tt_local_reset_flags(bat_priv, TT_CLIENT_NEW);
1734         tt_local_purge_pending_clients(bat_priv);
1735
1736         /* Increment the TTVN only once per OGM interval */
1737         atomic_inc(&bat_priv->ttvn);
1738         bat_priv->tt_poss_change = false;
1739 }