Merge branch 'batman-adv/next' of git://git.open-mesh.org/ecsv/linux-merge
[linux-3.10.git] / net / batman-adv / routing.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 "routing.h"
24 #include "send.h"
25 #include "hash.h"
26 #include "soft-interface.h"
27 #include "hard-interface.h"
28 #include "icmp_socket.h"
29 #include "translation-table.h"
30 #include "originator.h"
31 #include "ring_buffer.h"
32 #include "vis.h"
33 #include "aggregation.h"
34 #include "gateway_common.h"
35 #include "gateway_client.h"
36 #include "unicast.h"
37
38 void slide_own_bcast_window(struct hard_iface *hard_iface)
39 {
40         struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
41         struct hashtable_t *hash = bat_priv->orig_hash;
42         struct hlist_node *node;
43         struct hlist_head *head;
44         struct orig_node *orig_node;
45         unsigned long *word;
46         int i;
47         size_t word_index;
48
49         for (i = 0; i < hash->size; i++) {
50                 head = &hash->table[i];
51
52                 rcu_read_lock();
53                 hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
54                         spin_lock_bh(&orig_node->ogm_cnt_lock);
55                         word_index = hard_iface->if_num * NUM_WORDS;
56                         word = &(orig_node->bcast_own[word_index]);
57
58                         bit_get_packet(bat_priv, word, 1, 0);
59                         orig_node->bcast_own_sum[hard_iface->if_num] =
60                                 bit_packet_count(word);
61                         spin_unlock_bh(&orig_node->ogm_cnt_lock);
62                 }
63                 rcu_read_unlock();
64         }
65 }
66
67 static void update_HNA(struct bat_priv *bat_priv, struct orig_node *orig_node,
68                        unsigned char *hna_buff, int hna_buff_len)
69 {
70         if ((hna_buff_len != orig_node->hna_buff_len) ||
71             ((hna_buff_len > 0) &&
72              (orig_node->hna_buff_len > 0) &&
73              (memcmp(orig_node->hna_buff, hna_buff, hna_buff_len) != 0))) {
74
75                 if (orig_node->hna_buff_len > 0)
76                         hna_global_del_orig(bat_priv, orig_node,
77                                             "originator changed hna");
78
79                 if ((hna_buff_len > 0) && (hna_buff))
80                         hna_global_add_orig(bat_priv, orig_node,
81                                             hna_buff, hna_buff_len);
82         }
83 }
84
85 static void update_route(struct bat_priv *bat_priv,
86                          struct orig_node *orig_node,
87                          struct neigh_node *neigh_node,
88                          unsigned char *hna_buff, int hna_buff_len)
89 {
90         struct neigh_node *neigh_node_tmp;
91
92         /* route deleted */
93         if ((orig_node->router) && (!neigh_node)) {
94
95                 bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n",
96                         orig_node->orig);
97                 hna_global_del_orig(bat_priv, orig_node,
98                                     "originator timed out");
99
100                 /* route added */
101         } else if ((!orig_node->router) && (neigh_node)) {
102
103                 bat_dbg(DBG_ROUTES, bat_priv,
104                         "Adding route towards: %pM (via %pM)\n",
105                         orig_node->orig, neigh_node->addr);
106                 hna_global_add_orig(bat_priv, orig_node,
107                                     hna_buff, hna_buff_len);
108
109                 /* route changed */
110         } else {
111                 bat_dbg(DBG_ROUTES, bat_priv,
112                         "Changing route towards: %pM "
113                         "(now via %pM - was via %pM)\n",
114                         orig_node->orig, neigh_node->addr,
115                         orig_node->router->addr);
116         }
117
118         if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount))
119                 neigh_node = NULL;
120         neigh_node_tmp = orig_node->router;
121         orig_node->router = neigh_node;
122         if (neigh_node_tmp)
123                 neigh_node_free_ref(neigh_node_tmp);
124 }
125
126
127 void update_routes(struct bat_priv *bat_priv, struct orig_node *orig_node,
128                    struct neigh_node *neigh_node, unsigned char *hna_buff,
129                    int hna_buff_len)
130 {
131
132         if (!orig_node)
133                 return;
134
135         if (orig_node->router != neigh_node)
136                 update_route(bat_priv, orig_node, neigh_node,
137                              hna_buff, hna_buff_len);
138         /* may be just HNA changed */
139         else
140                 update_HNA(bat_priv, orig_node, hna_buff, hna_buff_len);
141 }
142
143 static int is_bidirectional_neigh(struct orig_node *orig_node,
144                                 struct orig_node *orig_neigh_node,
145                                 struct batman_packet *batman_packet,
146                                 struct hard_iface *if_incoming)
147 {
148         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
149         struct neigh_node *neigh_node = NULL, *tmp_neigh_node;
150         struct hlist_node *node;
151         unsigned char total_count;
152         uint8_t orig_eq_count, neigh_rq_count, tq_own;
153         int tq_asym_penalty, ret = 0;
154
155         if (orig_node == orig_neigh_node) {
156                 rcu_read_lock();
157                 hlist_for_each_entry_rcu(tmp_neigh_node, node,
158                                          &orig_node->neigh_list, list) {
159
160                         if (!compare_eth(tmp_neigh_node->addr,
161                                          orig_neigh_node->orig))
162                                 continue;
163
164                         if (tmp_neigh_node->if_incoming != if_incoming)
165                                 continue;
166
167                         if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
168                                 continue;
169
170                         neigh_node = tmp_neigh_node;
171                 }
172                 rcu_read_unlock();
173
174                 if (!neigh_node)
175                         neigh_node = create_neighbor(orig_node,
176                                                      orig_neigh_node,
177                                                      orig_neigh_node->orig,
178                                                      if_incoming);
179                 if (!neigh_node)
180                         goto out;
181
182                 neigh_node->last_valid = jiffies;
183         } else {
184                 /* find packet count of corresponding one hop neighbor */
185                 rcu_read_lock();
186                 hlist_for_each_entry_rcu(tmp_neigh_node, node,
187                                          &orig_neigh_node->neigh_list, list) {
188
189                         if (!compare_eth(tmp_neigh_node->addr,
190                                          orig_neigh_node->orig))
191                                 continue;
192
193                         if (tmp_neigh_node->if_incoming != if_incoming)
194                                 continue;
195
196                         if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
197                                 continue;
198
199                         neigh_node = tmp_neigh_node;
200                 }
201                 rcu_read_unlock();
202
203                 if (!neigh_node)
204                         neigh_node = create_neighbor(orig_neigh_node,
205                                                      orig_neigh_node,
206                                                      orig_neigh_node->orig,
207                                                      if_incoming);
208                 if (!neigh_node)
209                         goto out;
210         }
211
212         orig_node->last_valid = jiffies;
213
214         spin_lock_bh(&orig_node->ogm_cnt_lock);
215         orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];
216         neigh_rq_count = neigh_node->real_packet_count;
217         spin_unlock_bh(&orig_node->ogm_cnt_lock);
218
219         /* pay attention to not get a value bigger than 100 % */
220         total_count = (orig_eq_count > neigh_rq_count ?
221                        neigh_rq_count : orig_eq_count);
222
223         /* if we have too few packets (too less data) we set tq_own to zero */
224         /* if we receive too few packets it is not considered bidirectional */
225         if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) ||
226             (neigh_rq_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM))
227                 tq_own = 0;
228         else
229                 /* neigh_node->real_packet_count is never zero as we
230                  * only purge old information when getting new
231                  * information */
232                 tq_own = (TQ_MAX_VALUE * total_count) / neigh_rq_count;
233
234         /*
235          * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
236          * affect the nearly-symmetric links only a little, but
237          * punishes asymmetric links more.  This will give a value
238          * between 0 and TQ_MAX_VALUE
239          */
240         tq_asym_penalty = TQ_MAX_VALUE - (TQ_MAX_VALUE *
241                                 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *
242                                 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *
243                                 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count)) /
244                                         (TQ_LOCAL_WINDOW_SIZE *
245                                          TQ_LOCAL_WINDOW_SIZE *
246                                          TQ_LOCAL_WINDOW_SIZE);
247
248         batman_packet->tq = ((batman_packet->tq * tq_own * tq_asym_penalty) /
249                                                 (TQ_MAX_VALUE * TQ_MAX_VALUE));
250
251         bat_dbg(DBG_BATMAN, bat_priv,
252                 "bidirectional: "
253                 "orig = %-15pM neigh = %-15pM => own_bcast = %2i, "
254                 "real recv = %2i, local tq: %3i, asym_penalty: %3i, "
255                 "total tq: %3i\n",
256                 orig_node->orig, orig_neigh_node->orig, total_count,
257                 neigh_rq_count, tq_own, tq_asym_penalty, batman_packet->tq);
258
259         /* if link has the minimum required transmission quality
260          * consider it bidirectional */
261         if (batman_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT)
262                 ret = 1;
263
264 out:
265         if (neigh_node)
266                 neigh_node_free_ref(neigh_node);
267         return ret;
268 }
269
270 /* caller must hold the neigh_list_lock */
271 void bonding_candidate_del(struct orig_node *orig_node,
272                            struct neigh_node *neigh_node)
273 {
274         /* this neighbor is not part of our candidate list */
275         if (list_empty(&neigh_node->bonding_list))
276                 goto out;
277
278         list_del_rcu(&neigh_node->bonding_list);
279         INIT_LIST_HEAD(&neigh_node->bonding_list);
280         neigh_node_free_ref(neigh_node);
281         atomic_dec(&orig_node->bond_candidates);
282
283 out:
284         return;
285 }
286
287 static void bonding_candidate_add(struct orig_node *orig_node,
288                                   struct neigh_node *neigh_node)
289 {
290         struct hlist_node *node;
291         struct neigh_node *tmp_neigh_node;
292         uint8_t best_tq, interference_candidate = 0;
293
294         spin_lock_bh(&orig_node->neigh_list_lock);
295
296         /* only consider if it has the same primary address ...  */
297         if (!compare_eth(orig_node->orig,
298                          neigh_node->orig_node->primary_addr))
299                 goto candidate_del;
300
301         if (!orig_node->router)
302                 goto candidate_del;
303
304         best_tq = orig_node->router->tq_avg;
305
306         /* ... and is good enough to be considered */
307         if (neigh_node->tq_avg < best_tq - BONDING_TQ_THRESHOLD)
308                 goto candidate_del;
309
310         /**
311          * check if we have another candidate with the same mac address or
312          * interface. If we do, we won't select this candidate because of
313          * possible interference.
314          */
315         hlist_for_each_entry_rcu(tmp_neigh_node, node,
316                                  &orig_node->neigh_list, list) {
317
318                 if (tmp_neigh_node == neigh_node)
319                         continue;
320
321                 /* we only care if the other candidate is even
322                 * considered as candidate. */
323                 if (list_empty(&tmp_neigh_node->bonding_list))
324                         continue;
325
326                 if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) ||
327                     (compare_eth(neigh_node->addr, tmp_neigh_node->addr))) {
328                         interference_candidate = 1;
329                         break;
330                 }
331         }
332
333         /* don't care further if it is an interference candidate */
334         if (interference_candidate)
335                 goto candidate_del;
336
337         /* this neighbor already is part of our candidate list */
338         if (!list_empty(&neigh_node->bonding_list))
339                 goto out;
340
341         if (!atomic_inc_not_zero(&neigh_node->refcount))
342                 goto out;
343
344         list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list);
345         atomic_inc(&orig_node->bond_candidates);
346         goto out;
347
348 candidate_del:
349         bonding_candidate_del(orig_node, neigh_node);
350
351 out:
352         spin_unlock_bh(&orig_node->neigh_list_lock);
353         return;
354 }
355
356 /* copy primary address for bonding */
357 static void bonding_save_primary(struct orig_node *orig_node,
358                                  struct orig_node *orig_neigh_node,
359                                  struct batman_packet *batman_packet)
360 {
361         if (!(batman_packet->flags & PRIMARIES_FIRST_HOP))
362                 return;
363
364         memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN);
365 }
366
367 static void update_orig(struct bat_priv *bat_priv,
368                         struct orig_node *orig_node,
369                         struct ethhdr *ethhdr,
370                         struct batman_packet *batman_packet,
371                         struct hard_iface *if_incoming,
372                         unsigned char *hna_buff, int hna_buff_len,
373                         char is_duplicate)
374 {
375         struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
376         struct orig_node *orig_node_tmp;
377         struct hlist_node *node;
378         int tmp_hna_buff_len;
379         uint8_t bcast_own_sum_orig, bcast_own_sum_neigh;
380
381         bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): "
382                 "Searching and updating originator entry of received packet\n");
383
384         rcu_read_lock();
385         hlist_for_each_entry_rcu(tmp_neigh_node, node,
386                                  &orig_node->neigh_list, list) {
387                 if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&
388                     (tmp_neigh_node->if_incoming == if_incoming) &&
389                      atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
390                         if (neigh_node)
391                                 neigh_node_free_ref(neigh_node);
392                         neigh_node = tmp_neigh_node;
393                         continue;
394                 }
395
396                 if (is_duplicate)
397                         continue;
398
399                 ring_buffer_set(tmp_neigh_node->tq_recv,
400                                 &tmp_neigh_node->tq_index, 0);
401                 tmp_neigh_node->tq_avg =
402                         ring_buffer_avg(tmp_neigh_node->tq_recv);
403         }
404
405         if (!neigh_node) {
406                 struct orig_node *orig_tmp;
407
408                 orig_tmp = get_orig_node(bat_priv, ethhdr->h_source);
409                 if (!orig_tmp)
410                         goto unlock;
411
412                 neigh_node = create_neighbor(orig_node, orig_tmp,
413                                              ethhdr->h_source, if_incoming);
414
415                 orig_node_free_ref(orig_tmp);
416                 if (!neigh_node)
417                         goto unlock;
418         } else
419                 bat_dbg(DBG_BATMAN, bat_priv,
420                         "Updating existing last-hop neighbor of originator\n");
421
422         rcu_read_unlock();
423
424         orig_node->flags = batman_packet->flags;
425         neigh_node->last_valid = jiffies;
426
427         ring_buffer_set(neigh_node->tq_recv,
428                         &neigh_node->tq_index,
429                         batman_packet->tq);
430         neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
431
432         if (!is_duplicate) {
433                 orig_node->last_ttl = batman_packet->ttl;
434                 neigh_node->last_ttl = batman_packet->ttl;
435         }
436
437         bonding_candidate_add(orig_node, neigh_node);
438
439         tmp_hna_buff_len = (hna_buff_len > batman_packet->num_hna * ETH_ALEN ?
440                             batman_packet->num_hna * ETH_ALEN : hna_buff_len);
441
442         /* if this neighbor already is our next hop there is nothing
443          * to change */
444         if (orig_node->router == neigh_node)
445                 goto update_hna;
446
447         /* if this neighbor does not offer a better TQ we won't consider it */
448         if ((orig_node->router) &&
449             (orig_node->router->tq_avg > neigh_node->tq_avg))
450                 goto update_hna;
451
452         /* if the TQ is the same and the link not more symetric we
453          * won't consider it either */
454         if ((orig_node->router) &&
455              (neigh_node->tq_avg == orig_node->router->tq_avg)) {
456                 orig_node_tmp = orig_node->router->orig_node;
457                 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
458                 bcast_own_sum_orig =
459                         orig_node_tmp->bcast_own_sum[if_incoming->if_num];
460                 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
461
462                 orig_node_tmp = neigh_node->orig_node;
463                 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
464                 bcast_own_sum_neigh =
465                         orig_node_tmp->bcast_own_sum[if_incoming->if_num];
466                 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
467
468                 if (bcast_own_sum_orig >= bcast_own_sum_neigh)
469                         goto update_hna;
470         }
471
472         update_routes(bat_priv, orig_node, neigh_node,
473                       hna_buff, tmp_hna_buff_len);
474         goto update_gw;
475
476 update_hna:
477         update_routes(bat_priv, orig_node, orig_node->router,
478                       hna_buff, tmp_hna_buff_len);
479
480 update_gw:
481         if (orig_node->gw_flags != batman_packet->gw_flags)
482                 gw_node_update(bat_priv, orig_node, batman_packet->gw_flags);
483
484         orig_node->gw_flags = batman_packet->gw_flags;
485
486         /* restart gateway selection if fast or late switching was enabled */
487         if ((orig_node->gw_flags) &&
488             (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) &&
489             (atomic_read(&bat_priv->gw_sel_class) > 2))
490                 gw_check_election(bat_priv, orig_node);
491
492         goto out;
493
494 unlock:
495         rcu_read_unlock();
496 out:
497         if (neigh_node)
498                 neigh_node_free_ref(neigh_node);
499 }
500
501 /* checks whether the host restarted and is in the protection time.
502  * returns:
503  *  0 if the packet is to be accepted
504  *  1 if the packet is to be ignored.
505  */
506 static int window_protected(struct bat_priv *bat_priv,
507                             int32_t seq_num_diff,
508                             unsigned long *last_reset)
509 {
510         if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE)
511                 || (seq_num_diff >= EXPECTED_SEQNO_RANGE)) {
512                 if (time_after(jiffies, *last_reset +
513                         msecs_to_jiffies(RESET_PROTECTION_MS))) {
514
515                         *last_reset = jiffies;
516                         bat_dbg(DBG_BATMAN, bat_priv,
517                                 "old packet received, start protection\n");
518
519                         return 0;
520                 } else
521                         return 1;
522         }
523         return 0;
524 }
525
526 /* processes a batman packet for all interfaces, adjusts the sequence number and
527  * finds out whether it is a duplicate.
528  * returns:
529  *   1 the packet is a duplicate
530  *   0 the packet has not yet been received
531  *  -1 the packet is old and has been received while the seqno window
532  *     was protected. Caller should drop it.
533  */
534 static char count_real_packets(struct ethhdr *ethhdr,
535                                struct batman_packet *batman_packet,
536                                struct hard_iface *if_incoming)
537 {
538         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
539         struct orig_node *orig_node;
540         struct neigh_node *tmp_neigh_node;
541         struct hlist_node *node;
542         char is_duplicate = 0;
543         int32_t seq_diff;
544         int need_update = 0;
545         int set_mark, ret = -1;
546
547         orig_node = get_orig_node(bat_priv, batman_packet->orig);
548         if (!orig_node)
549                 return 0;
550
551         spin_lock_bh(&orig_node->ogm_cnt_lock);
552         seq_diff = batman_packet->seqno - orig_node->last_real_seqno;
553
554         /* signalize caller that the packet is to be dropped. */
555         if (window_protected(bat_priv, seq_diff,
556                              &orig_node->batman_seqno_reset))
557                 goto out;
558
559         rcu_read_lock();
560         hlist_for_each_entry_rcu(tmp_neigh_node, node,
561                                  &orig_node->neigh_list, list) {
562
563                 is_duplicate |= get_bit_status(tmp_neigh_node->real_bits,
564                                                orig_node->last_real_seqno,
565                                                batman_packet->seqno);
566
567                 if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&
568                     (tmp_neigh_node->if_incoming == if_incoming))
569                         set_mark = 1;
570                 else
571                         set_mark = 0;
572
573                 /* if the window moved, set the update flag. */
574                 need_update |= bit_get_packet(bat_priv,
575                                               tmp_neigh_node->real_bits,
576                                               seq_diff, set_mark);
577
578                 tmp_neigh_node->real_packet_count =
579                         bit_packet_count(tmp_neigh_node->real_bits);
580         }
581         rcu_read_unlock();
582
583         if (need_update) {
584                 bat_dbg(DBG_BATMAN, bat_priv,
585                         "updating last_seqno: old %d, new %d\n",
586                         orig_node->last_real_seqno, batman_packet->seqno);
587                 orig_node->last_real_seqno = batman_packet->seqno;
588         }
589
590         ret = is_duplicate;
591
592 out:
593         spin_unlock_bh(&orig_node->ogm_cnt_lock);
594         orig_node_free_ref(orig_node);
595         return ret;
596 }
597
598 void receive_bat_packet(struct ethhdr *ethhdr,
599                         struct batman_packet *batman_packet,
600                         unsigned char *hna_buff, int hna_buff_len,
601                         struct hard_iface *if_incoming)
602 {
603         struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
604         struct hard_iface *hard_iface;
605         struct orig_node *orig_neigh_node, *orig_node;
606         char has_directlink_flag;
607         char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
608         char is_broadcast = 0, is_bidirectional, is_single_hop_neigh;
609         char is_duplicate;
610         uint32_t if_incoming_seqno;
611
612         /* Silently drop when the batman packet is actually not a
613          * correct packet.
614          *
615          * This might happen if a packet is padded (e.g. Ethernet has a
616          * minimum frame length of 64 byte) and the aggregation interprets
617          * it as an additional length.
618          *
619          * TODO: A more sane solution would be to have a bit in the
620          * batman_packet to detect whether the packet is the last
621          * packet in an aggregation.  Here we expect that the padding
622          * is always zero (or not 0x01)
623          */
624         if (batman_packet->packet_type != BAT_PACKET)
625                 return;
626
627         /* could be changed by schedule_own_packet() */
628         if_incoming_seqno = atomic_read(&if_incoming->seqno);
629
630         has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0);
631
632         is_single_hop_neigh = (compare_eth(ethhdr->h_source,
633                                            batman_packet->orig) ? 1 : 0);
634
635         bat_dbg(DBG_BATMAN, bat_priv,
636                 "Received BATMAN packet via NB: %pM, IF: %s [%pM] "
637                 "(from OG: %pM, via prev OG: %pM, seqno %d, tq %d, "
638                 "TTL %d, V %d, IDF %d)\n",
639                 ethhdr->h_source, if_incoming->net_dev->name,
640                 if_incoming->net_dev->dev_addr, batman_packet->orig,
641                 batman_packet->prev_sender, batman_packet->seqno,
642                 batman_packet->tq, batman_packet->ttl, batman_packet->version,
643                 has_directlink_flag);
644
645         rcu_read_lock();
646         list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
647                 if (hard_iface->if_status != IF_ACTIVE)
648                         continue;
649
650                 if (hard_iface->soft_iface != if_incoming->soft_iface)
651                         continue;
652
653                 if (compare_eth(ethhdr->h_source,
654                                 hard_iface->net_dev->dev_addr))
655                         is_my_addr = 1;
656
657                 if (compare_eth(batman_packet->orig,
658                                 hard_iface->net_dev->dev_addr))
659                         is_my_orig = 1;
660
661                 if (compare_eth(batman_packet->prev_sender,
662                                 hard_iface->net_dev->dev_addr))
663                         is_my_oldorig = 1;
664
665                 if (compare_eth(ethhdr->h_source, broadcast_addr))
666                         is_broadcast = 1;
667         }
668         rcu_read_unlock();
669
670         if (batman_packet->version != COMPAT_VERSION) {
671                 bat_dbg(DBG_BATMAN, bat_priv,
672                         "Drop packet: incompatible batman version (%i)\n",
673                         batman_packet->version);
674                 return;
675         }
676
677         if (is_my_addr) {
678                 bat_dbg(DBG_BATMAN, bat_priv,
679                         "Drop packet: received my own broadcast (sender: %pM"
680                         ")\n",
681                         ethhdr->h_source);
682                 return;
683         }
684
685         if (is_broadcast) {
686                 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
687                 "ignoring all packets with broadcast source addr (sender: %pM"
688                 ")\n", ethhdr->h_source);
689                 return;
690         }
691
692         if (is_my_orig) {
693                 unsigned long *word;
694                 int offset;
695
696                 orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source);
697                 if (!orig_neigh_node)
698                         return;
699
700                 /* neighbor has to indicate direct link and it has to
701                  * come via the corresponding interface */
702                 /* if received seqno equals last send seqno save new
703                  * seqno for bidirectional check */
704                 if (has_directlink_flag &&
705                     compare_eth(if_incoming->net_dev->dev_addr,
706                                 batman_packet->orig) &&
707                     (batman_packet->seqno - if_incoming_seqno + 2 == 0)) {
708                         offset = if_incoming->if_num * NUM_WORDS;
709
710                         spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
711                         word = &(orig_neigh_node->bcast_own[offset]);
712                         bit_mark(word, 0);
713                         orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
714                                 bit_packet_count(word);
715                         spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
716                 }
717
718                 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
719                         "originator packet from myself (via neighbor)\n");
720                 orig_node_free_ref(orig_neigh_node);
721                 return;
722         }
723
724         if (is_my_oldorig) {
725                 bat_dbg(DBG_BATMAN, bat_priv,
726                         "Drop packet: ignoring all rebroadcast echos (sender: "
727                         "%pM)\n", ethhdr->h_source);
728                 return;
729         }
730
731         orig_node = get_orig_node(bat_priv, batman_packet->orig);
732         if (!orig_node)
733                 return;
734
735         is_duplicate = count_real_packets(ethhdr, batman_packet, if_incoming);
736
737         if (is_duplicate == -1) {
738                 bat_dbg(DBG_BATMAN, bat_priv,
739                         "Drop packet: packet within seqno protection time "
740                         "(sender: %pM)\n", ethhdr->h_source);
741                 goto out;
742         }
743
744         if (batman_packet->tq == 0) {
745                 bat_dbg(DBG_BATMAN, bat_priv,
746                         "Drop packet: originator packet with tq equal 0\n");
747                 goto out;
748         }
749
750         /* avoid temporary routing loops */
751         if ((orig_node->router) &&
752             (orig_node->router->orig_node->router) &&
753             (compare_eth(orig_node->router->addr,
754                          batman_packet->prev_sender)) &&
755             !(compare_eth(batman_packet->orig, batman_packet->prev_sender)) &&
756             (compare_eth(orig_node->router->addr,
757                          orig_node->router->orig_node->router->addr))) {
758                 bat_dbg(DBG_BATMAN, bat_priv,
759                         "Drop packet: ignoring all rebroadcast packets that "
760                         "may make me loop (sender: %pM)\n", ethhdr->h_source);
761                 goto out;
762         }
763
764         /* if sender is a direct neighbor the sender mac equals
765          * originator mac */
766         orig_neigh_node = (is_single_hop_neigh ?
767                            orig_node :
768                            get_orig_node(bat_priv, ethhdr->h_source));
769         if (!orig_neigh_node)
770                 goto out;
771
772         /* drop packet if sender is not a direct neighbor and if we
773          * don't route towards it */
774         if (!is_single_hop_neigh && (!orig_neigh_node->router)) {
775                 bat_dbg(DBG_BATMAN, bat_priv,
776                         "Drop packet: OGM via unknown neighbor!\n");
777                 goto out_neigh;
778         }
779
780         is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node,
781                                                 batman_packet, if_incoming);
782
783         bonding_save_primary(orig_node, orig_neigh_node, batman_packet);
784
785         /* update ranking if it is not a duplicate or has the same
786          * seqno and similar ttl as the non-duplicate */
787         if (is_bidirectional &&
788             (!is_duplicate ||
789              ((orig_node->last_real_seqno == batman_packet->seqno) &&
790               (orig_node->last_ttl - 3 <= batman_packet->ttl))))
791                 update_orig(bat_priv, orig_node, ethhdr, batman_packet,
792                             if_incoming, hna_buff, hna_buff_len, is_duplicate);
793
794         /* is single hop (direct) neighbor */
795         if (is_single_hop_neigh) {
796
797                 /* mark direct link on incoming interface */
798                 schedule_forward_packet(orig_node, ethhdr, batman_packet,
799                                         1, hna_buff_len, if_incoming);
800
801                 bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: "
802                         "rebroadcast neighbor packet with direct link flag\n");
803                 goto out_neigh;
804         }
805
806         /* multihop originator */
807         if (!is_bidirectional) {
808                 bat_dbg(DBG_BATMAN, bat_priv,
809                         "Drop packet: not received via bidirectional link\n");
810                 goto out_neigh;
811         }
812
813         if (is_duplicate) {
814                 bat_dbg(DBG_BATMAN, bat_priv,
815                         "Drop packet: duplicate packet received\n");
816                 goto out_neigh;
817         }
818
819         bat_dbg(DBG_BATMAN, bat_priv,
820                 "Forwarding packet: rebroadcast originator packet\n");
821         schedule_forward_packet(orig_node, ethhdr, batman_packet,
822                                 0, hna_buff_len, if_incoming);
823
824 out_neigh:
825         if ((orig_neigh_node) && (!is_single_hop_neigh))
826                 orig_node_free_ref(orig_neigh_node);
827 out:
828         orig_node_free_ref(orig_node);
829 }
830
831 int recv_bat_packet(struct sk_buff *skb, struct hard_iface *hard_iface)
832 {
833         struct ethhdr *ethhdr;
834
835         /* drop packet if it has not necessary minimum size */
836         if (unlikely(!pskb_may_pull(skb, sizeof(struct batman_packet))))
837                 return NET_RX_DROP;
838
839         ethhdr = (struct ethhdr *)skb_mac_header(skb);
840
841         /* packet with broadcast indication but unicast recipient */
842         if (!is_broadcast_ether_addr(ethhdr->h_dest))
843                 return NET_RX_DROP;
844
845         /* packet with broadcast sender address */
846         if (is_broadcast_ether_addr(ethhdr->h_source))
847                 return NET_RX_DROP;
848
849         /* create a copy of the skb, if needed, to modify it. */
850         if (skb_cow(skb, 0) < 0)
851                 return NET_RX_DROP;
852
853         /* keep skb linear */
854         if (skb_linearize(skb) < 0)
855                 return NET_RX_DROP;
856
857         ethhdr = (struct ethhdr *)skb_mac_header(skb);
858
859         receive_aggr_bat_packet(ethhdr,
860                                 skb->data,
861                                 skb_headlen(skb),
862                                 hard_iface);
863
864         kfree_skb(skb);
865         return NET_RX_SUCCESS;
866 }
867
868 static int recv_my_icmp_packet(struct bat_priv *bat_priv,
869                                struct sk_buff *skb, size_t icmp_len)
870 {
871         struct orig_node *orig_node = NULL;
872         struct neigh_node *neigh_node = NULL;
873         struct icmp_packet_rr *icmp_packet;
874         int ret = NET_RX_DROP;
875
876         icmp_packet = (struct icmp_packet_rr *)skb->data;
877
878         /* add data to device queue */
879         if (icmp_packet->msg_type != ECHO_REQUEST) {
880                 bat_socket_receive_packet(icmp_packet, icmp_len);
881                 goto out;
882         }
883
884         if (!bat_priv->primary_if)
885                 goto out;
886
887         /* answer echo request (ping) */
888         /* get routing information */
889         rcu_read_lock();
890         orig_node = orig_hash_find(bat_priv, icmp_packet->orig);
891
892         if (!orig_node)
893                 goto unlock;
894
895         neigh_node = orig_node->router;
896
897         if (!neigh_node)
898                 goto unlock;
899
900         if (!atomic_inc_not_zero(&neigh_node->refcount)) {
901                 neigh_node = NULL;
902                 goto unlock;
903         }
904
905         rcu_read_unlock();
906
907         /* create a copy of the skb, if needed, to modify it. */
908         if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
909                 goto out;
910
911         icmp_packet = (struct icmp_packet_rr *)skb->data;
912
913         memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
914         memcpy(icmp_packet->orig,
915                 bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
916         icmp_packet->msg_type = ECHO_REPLY;
917         icmp_packet->ttl = TTL;
918
919         send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
920         ret = NET_RX_SUCCESS;
921         goto out;
922
923 unlock:
924         rcu_read_unlock();
925 out:
926         if (neigh_node)
927                 neigh_node_free_ref(neigh_node);
928         if (orig_node)
929                 orig_node_free_ref(orig_node);
930         return ret;
931 }
932
933 static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv,
934                                   struct sk_buff *skb)
935 {
936         struct orig_node *orig_node = NULL;
937         struct neigh_node *neigh_node = NULL;
938         struct icmp_packet *icmp_packet;
939         int ret = NET_RX_DROP;
940
941         icmp_packet = (struct icmp_packet *)skb->data;
942
943         /* send TTL exceeded if packet is an echo request (traceroute) */
944         if (icmp_packet->msg_type != ECHO_REQUEST) {
945                 pr_debug("Warning - can't forward icmp packet from %pM to "
946                          "%pM: ttl exceeded\n", icmp_packet->orig,
947                          icmp_packet->dst);
948                 goto out;
949         }
950
951         if (!bat_priv->primary_if)
952                 goto out;
953
954         /* get routing information */
955         rcu_read_lock();
956         orig_node = orig_hash_find(bat_priv, icmp_packet->orig);
957
958         if (!orig_node)
959                 goto unlock;
960
961         neigh_node = orig_node->router;
962
963         if (!neigh_node)
964                 goto unlock;
965
966         if (!atomic_inc_not_zero(&neigh_node->refcount)) {
967                 neigh_node = NULL;
968                 goto unlock;
969         }
970
971         rcu_read_unlock();
972
973         /* create a copy of the skb, if needed, to modify it. */
974         if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
975                 goto out;
976
977         icmp_packet = (struct icmp_packet *)skb->data;
978
979         memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
980         memcpy(icmp_packet->orig,
981                 bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
982         icmp_packet->msg_type = TTL_EXCEEDED;
983         icmp_packet->ttl = TTL;
984
985         send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
986         ret = NET_RX_SUCCESS;
987         goto out;
988
989 unlock:
990         rcu_read_unlock();
991 out:
992         if (neigh_node)
993                 neigh_node_free_ref(neigh_node);
994         if (orig_node)
995                 orig_node_free_ref(orig_node);
996         return ret;
997 }
998
999
1000 int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if)
1001 {
1002         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1003         struct icmp_packet_rr *icmp_packet;
1004         struct ethhdr *ethhdr;
1005         struct orig_node *orig_node = NULL;
1006         struct neigh_node *neigh_node = NULL;
1007         int hdr_size = sizeof(struct icmp_packet);
1008         int ret = NET_RX_DROP;
1009
1010         /**
1011          * we truncate all incoming icmp packets if they don't match our size
1012          */
1013         if (skb->len >= sizeof(struct icmp_packet_rr))
1014                 hdr_size = sizeof(struct icmp_packet_rr);
1015
1016         /* drop packet if it has not necessary minimum size */
1017         if (unlikely(!pskb_may_pull(skb, hdr_size)))
1018                 goto out;
1019
1020         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1021
1022         /* packet with unicast indication but broadcast recipient */
1023         if (is_broadcast_ether_addr(ethhdr->h_dest))
1024                 goto out;
1025
1026         /* packet with broadcast sender address */
1027         if (is_broadcast_ether_addr(ethhdr->h_source))
1028                 goto out;
1029
1030         /* not for me */
1031         if (!is_my_mac(ethhdr->h_dest))
1032                 goto out;
1033
1034         icmp_packet = (struct icmp_packet_rr *)skb->data;
1035
1036         /* add record route information if not full */
1037         if ((hdr_size == sizeof(struct icmp_packet_rr)) &&
1038             (icmp_packet->rr_cur < BAT_RR_LEN)) {
1039                 memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]),
1040                         ethhdr->h_dest, ETH_ALEN);
1041                 icmp_packet->rr_cur++;
1042         }
1043
1044         /* packet for me */
1045         if (is_my_mac(icmp_packet->dst))
1046                 return recv_my_icmp_packet(bat_priv, skb, hdr_size);
1047
1048         /* TTL exceeded */
1049         if (icmp_packet->ttl < 2)
1050                 return recv_icmp_ttl_exceeded(bat_priv, skb);
1051
1052         /* get routing information */
1053         rcu_read_lock();
1054         orig_node = orig_hash_find(bat_priv, icmp_packet->dst);
1055
1056         if (!orig_node)
1057                 goto unlock;
1058
1059         neigh_node = orig_node->router;
1060
1061         if (!neigh_node)
1062                 goto unlock;
1063
1064         if (!atomic_inc_not_zero(&neigh_node->refcount)) {
1065                 neigh_node = NULL;
1066                 goto unlock;
1067         }
1068
1069         rcu_read_unlock();
1070
1071         /* create a copy of the skb, if needed, to modify it. */
1072         if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
1073                 goto out;
1074
1075         icmp_packet = (struct icmp_packet_rr *)skb->data;
1076
1077         /* decrement ttl */
1078         icmp_packet->ttl--;
1079
1080         /* route it */
1081         send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1082         ret = NET_RX_SUCCESS;
1083         goto out;
1084
1085 unlock:
1086         rcu_read_unlock();
1087 out:
1088         if (neigh_node)
1089                 neigh_node_free_ref(neigh_node);
1090         if (orig_node)
1091                 orig_node_free_ref(orig_node);
1092         return ret;
1093 }
1094
1095 /* find a suitable router for this originator, and use
1096  * bonding if possible. increases the found neighbors
1097  * refcount.*/
1098 struct neigh_node *find_router(struct bat_priv *bat_priv,
1099                                struct orig_node *orig_node,
1100                                struct hard_iface *recv_if)
1101 {
1102         struct orig_node *primary_orig_node;
1103         struct orig_node *router_orig;
1104         struct neigh_node *router, *first_candidate, *tmp_neigh_node;
1105         static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
1106         int bonding_enabled;
1107
1108         if (!orig_node)
1109                 return NULL;
1110
1111         if (!orig_node->router)
1112                 return NULL;
1113
1114         /* without bonding, the first node should
1115          * always choose the default router. */
1116         bonding_enabled = atomic_read(&bat_priv->bonding);
1117
1118         rcu_read_lock();
1119         /* select default router to output */
1120         router = orig_node->router;
1121         router_orig = orig_node->router->orig_node;
1122         if (!router_orig || !atomic_inc_not_zero(&router->refcount)) {
1123                 rcu_read_unlock();
1124                 return NULL;
1125         }
1126
1127         if ((!recv_if) && (!bonding_enabled))
1128                 goto return_router;
1129
1130         /* if we have something in the primary_addr, we can search
1131          * for a potential bonding candidate. */
1132         if (compare_eth(router_orig->primary_addr, zero_mac))
1133                 goto return_router;
1134
1135         /* find the orig_node which has the primary interface. might
1136          * even be the same as our router_orig in many cases */
1137
1138         if (compare_eth(router_orig->primary_addr, router_orig->orig)) {
1139                 primary_orig_node = router_orig;
1140         } else {
1141                 primary_orig_node = orig_hash_find(bat_priv,
1142                                                    router_orig->primary_addr);
1143                 if (!primary_orig_node)
1144                         goto return_router;
1145
1146                 orig_node_free_ref(primary_orig_node);
1147         }
1148
1149         /* with less than 2 candidates, we can't do any
1150          * bonding and prefer the original router. */
1151         if (atomic_read(&primary_orig_node->bond_candidates) < 2)
1152                 goto return_router;
1153
1154
1155         /* all nodes between should choose a candidate which
1156          * is is not on the interface where the packet came
1157          * in. */
1158
1159         neigh_node_free_ref(router);
1160         first_candidate = NULL;
1161         router = NULL;
1162
1163         if (bonding_enabled) {
1164                 /* in the bonding case, send the packets in a round
1165                  * robin fashion over the remaining interfaces. */
1166
1167                 list_for_each_entry_rcu(tmp_neigh_node,
1168                                 &primary_orig_node->bond_list, bonding_list) {
1169                         if (!first_candidate)
1170                                 first_candidate = tmp_neigh_node;
1171                         /* recv_if == NULL on the first node. */
1172                         if (tmp_neigh_node->if_incoming != recv_if &&
1173                             atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
1174                                 router = tmp_neigh_node;
1175                                 break;
1176                         }
1177                 }
1178
1179                 /* use the first candidate if nothing was found. */
1180                 if (!router && first_candidate &&
1181                     atomic_inc_not_zero(&first_candidate->refcount))
1182                         router = first_candidate;
1183
1184                 if (!router) {
1185                         rcu_read_unlock();
1186                         return NULL;
1187                 }
1188
1189                 /* selected should point to the next element
1190                  * after the current router */
1191                 spin_lock_bh(&primary_orig_node->neigh_list_lock);
1192                 /* this is a list_move(), which unfortunately
1193                  * does not exist as rcu version */
1194                 list_del_rcu(&primary_orig_node->bond_list);
1195                 list_add_rcu(&primary_orig_node->bond_list,
1196                                 &router->bonding_list);
1197                 spin_unlock_bh(&primary_orig_node->neigh_list_lock);
1198
1199         } else {
1200                 /* if bonding is disabled, use the best of the
1201                  * remaining candidates which are not using
1202                  * this interface. */
1203                 list_for_each_entry_rcu(tmp_neigh_node,
1204                         &primary_orig_node->bond_list, bonding_list) {
1205                         if (!first_candidate)
1206                                 first_candidate = tmp_neigh_node;
1207
1208                         /* recv_if == NULL on the first node. */
1209                         if (tmp_neigh_node->if_incoming == recv_if)
1210                                 continue;
1211
1212                         if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
1213                                 continue;
1214
1215                         /* if we don't have a router yet
1216                          * or this one is better, choose it. */
1217                         if ((!router) ||
1218                             (tmp_neigh_node->tq_avg > router->tq_avg)) {
1219                                 /* decrement refcount of
1220                                  * previously selected router */
1221                                 if (router)
1222                                         neigh_node_free_ref(router);
1223
1224                                 router = tmp_neigh_node;
1225                                 atomic_inc_not_zero(&router->refcount);
1226                         }
1227
1228                         neigh_node_free_ref(tmp_neigh_node);
1229                 }
1230
1231                 /* use the first candidate if nothing was found. */
1232                 if (!router && first_candidate &&
1233                     atomic_inc_not_zero(&first_candidate->refcount))
1234                         router = first_candidate;
1235         }
1236 return_router:
1237         rcu_read_unlock();
1238         return router;
1239 }
1240
1241 static int check_unicast_packet(struct sk_buff *skb, int hdr_size)
1242 {
1243         struct ethhdr *ethhdr;
1244
1245         /* drop packet if it has not necessary minimum size */
1246         if (unlikely(!pskb_may_pull(skb, hdr_size)))
1247                 return -1;
1248
1249         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1250
1251         /* packet with unicast indication but broadcast recipient */
1252         if (is_broadcast_ether_addr(ethhdr->h_dest))
1253                 return -1;
1254
1255         /* packet with broadcast sender address */
1256         if (is_broadcast_ether_addr(ethhdr->h_source))
1257                 return -1;
1258
1259         /* not for me */
1260         if (!is_my_mac(ethhdr->h_dest))
1261                 return -1;
1262
1263         return 0;
1264 }
1265
1266 int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
1267 {
1268         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1269         struct orig_node *orig_node = NULL;
1270         struct neigh_node *neigh_node = NULL;
1271         struct unicast_packet *unicast_packet;
1272         struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb);
1273         int ret = NET_RX_DROP;
1274         struct sk_buff *new_skb;
1275
1276         unicast_packet = (struct unicast_packet *)skb->data;
1277
1278         /* TTL exceeded */
1279         if (unicast_packet->ttl < 2) {
1280                 pr_debug("Warning - can't forward unicast packet from %pM to "
1281                          "%pM: ttl exceeded\n", ethhdr->h_source,
1282                          unicast_packet->dest);
1283                 goto out;
1284         }
1285
1286         /* get routing information */
1287         rcu_read_lock();
1288         orig_node = orig_hash_find(bat_priv, unicast_packet->dest);
1289
1290         if (!orig_node)
1291                 goto unlock;
1292
1293         rcu_read_unlock();
1294
1295         /* find_router() increases neigh_nodes refcount if found. */
1296         neigh_node = find_router(bat_priv, orig_node, recv_if);
1297
1298         if (!neigh_node)
1299                 goto out;
1300
1301         /* create a copy of the skb, if needed, to modify it. */
1302         if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
1303                 goto out;
1304
1305         unicast_packet = (struct unicast_packet *)skb->data;
1306
1307         if (unicast_packet->packet_type == BAT_UNICAST &&
1308             atomic_read(&bat_priv->fragmentation) &&
1309             skb->len > neigh_node->if_incoming->net_dev->mtu) {
1310                 ret = frag_send_skb(skb, bat_priv,
1311                                     neigh_node->if_incoming, neigh_node->addr);
1312                 goto out;
1313         }
1314
1315         if (unicast_packet->packet_type == BAT_UNICAST_FRAG &&
1316             frag_can_reassemble(skb, neigh_node->if_incoming->net_dev->mtu)) {
1317
1318                 ret = frag_reassemble_skb(skb, bat_priv, &new_skb);
1319
1320                 if (ret == NET_RX_DROP)
1321                         goto out;
1322
1323                 /* packet was buffered for late merge */
1324                 if (!new_skb) {
1325                         ret = NET_RX_SUCCESS;
1326                         goto out;
1327                 }
1328
1329                 skb = new_skb;
1330                 unicast_packet = (struct unicast_packet *)skb->data;
1331         }
1332
1333         /* decrement ttl */
1334         unicast_packet->ttl--;
1335
1336         /* route it */
1337         send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1338         ret = NET_RX_SUCCESS;
1339         goto out;
1340
1341 unlock:
1342         rcu_read_unlock();
1343 out:
1344         if (neigh_node)
1345                 neigh_node_free_ref(neigh_node);
1346         if (orig_node)
1347                 orig_node_free_ref(orig_node);
1348         return ret;
1349 }
1350
1351 int recv_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
1352 {
1353         struct unicast_packet *unicast_packet;
1354         int hdr_size = sizeof(struct unicast_packet);
1355
1356         if (check_unicast_packet(skb, hdr_size) < 0)
1357                 return NET_RX_DROP;
1358
1359         unicast_packet = (struct unicast_packet *)skb->data;
1360
1361         /* packet for me */
1362         if (is_my_mac(unicast_packet->dest)) {
1363                 interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size);
1364                 return NET_RX_SUCCESS;
1365         }
1366
1367         return route_unicast_packet(skb, recv_if);
1368 }
1369
1370 int recv_ucast_frag_packet(struct sk_buff *skb, struct hard_iface *recv_if)
1371 {
1372         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1373         struct unicast_frag_packet *unicast_packet;
1374         int hdr_size = sizeof(struct unicast_frag_packet);
1375         struct sk_buff *new_skb = NULL;
1376         int ret;
1377
1378         if (check_unicast_packet(skb, hdr_size) < 0)
1379                 return NET_RX_DROP;
1380
1381         unicast_packet = (struct unicast_frag_packet *)skb->data;
1382
1383         /* packet for me */
1384         if (is_my_mac(unicast_packet->dest)) {
1385
1386                 ret = frag_reassemble_skb(skb, bat_priv, &new_skb);
1387
1388                 if (ret == NET_RX_DROP)
1389                         return NET_RX_DROP;
1390
1391                 /* packet was buffered for late merge */
1392                 if (!new_skb)
1393                         return NET_RX_SUCCESS;
1394
1395                 interface_rx(recv_if->soft_iface, new_skb, recv_if,
1396                              sizeof(struct unicast_packet));
1397                 return NET_RX_SUCCESS;
1398         }
1399
1400         return route_unicast_packet(skb, recv_if);
1401 }
1402
1403
1404 int recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
1405 {
1406         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1407         struct orig_node *orig_node = NULL;
1408         struct bcast_packet *bcast_packet;
1409         struct ethhdr *ethhdr;
1410         int hdr_size = sizeof(struct bcast_packet);
1411         int ret = NET_RX_DROP;
1412         int32_t seq_diff;
1413
1414         /* drop packet if it has not necessary minimum size */
1415         if (unlikely(!pskb_may_pull(skb, hdr_size)))
1416                 goto out;
1417
1418         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1419
1420         /* packet with broadcast indication but unicast recipient */
1421         if (!is_broadcast_ether_addr(ethhdr->h_dest))
1422                 goto out;
1423
1424         /* packet with broadcast sender address */
1425         if (is_broadcast_ether_addr(ethhdr->h_source))
1426                 goto out;
1427
1428         /* ignore broadcasts sent by myself */
1429         if (is_my_mac(ethhdr->h_source))
1430                 goto out;
1431
1432         bcast_packet = (struct bcast_packet *)skb->data;
1433
1434         /* ignore broadcasts originated by myself */
1435         if (is_my_mac(bcast_packet->orig))
1436                 goto out;
1437
1438         if (bcast_packet->ttl < 2)
1439                 goto out;
1440
1441         rcu_read_lock();
1442         orig_node = orig_hash_find(bat_priv, bcast_packet->orig);
1443
1444         if (!orig_node)
1445                 goto rcu_unlock;
1446
1447         rcu_read_unlock();
1448
1449         spin_lock_bh(&orig_node->bcast_seqno_lock);
1450
1451         /* check whether the packet is a duplicate */
1452         if (get_bit_status(orig_node->bcast_bits, orig_node->last_bcast_seqno,
1453                            ntohl(bcast_packet->seqno)))
1454                 goto spin_unlock;
1455
1456         seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno;
1457
1458         /* check whether the packet is old and the host just restarted. */
1459         if (window_protected(bat_priv, seq_diff,
1460                              &orig_node->bcast_seqno_reset))
1461                 goto spin_unlock;
1462
1463         /* mark broadcast in flood history, update window position
1464          * if required. */
1465         if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1))
1466                 orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno);
1467
1468         spin_unlock_bh(&orig_node->bcast_seqno_lock);
1469
1470         /* rebroadcast packet */
1471         add_bcast_packet_to_list(bat_priv, skb);
1472
1473         /* broadcast for me */
1474         interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size);
1475         ret = NET_RX_SUCCESS;
1476         goto out;
1477
1478 rcu_unlock:
1479         rcu_read_unlock();
1480         goto out;
1481 spin_unlock:
1482         spin_unlock_bh(&orig_node->bcast_seqno_lock);
1483 out:
1484         if (orig_node)
1485                 orig_node_free_ref(orig_node);
1486         return ret;
1487 }
1488
1489 int recv_vis_packet(struct sk_buff *skb, struct hard_iface *recv_if)
1490 {
1491         struct vis_packet *vis_packet;
1492         struct ethhdr *ethhdr;
1493         struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1494         int hdr_size = sizeof(struct vis_packet);
1495
1496         /* keep skb linear */
1497         if (skb_linearize(skb) < 0)
1498                 return NET_RX_DROP;
1499
1500         if (unlikely(!pskb_may_pull(skb, hdr_size)))
1501                 return NET_RX_DROP;
1502
1503         vis_packet = (struct vis_packet *)skb->data;
1504         ethhdr = (struct ethhdr *)skb_mac_header(skb);
1505
1506         /* not for me */
1507         if (!is_my_mac(ethhdr->h_dest))
1508                 return NET_RX_DROP;
1509
1510         /* ignore own packets */
1511         if (is_my_mac(vis_packet->vis_orig))
1512                 return NET_RX_DROP;
1513
1514         if (is_my_mac(vis_packet->sender_orig))
1515                 return NET_RX_DROP;
1516
1517         switch (vis_packet->vis_type) {
1518         case VIS_TYPE_SERVER_SYNC:
1519                 receive_server_sync_packet(bat_priv, vis_packet,
1520                                            skb_headlen(skb));
1521                 break;
1522
1523         case VIS_TYPE_CLIENT_UPDATE:
1524                 receive_client_update_packet(bat_priv, vis_packet,
1525                                              skb_headlen(skb));
1526                 break;
1527
1528         default:        /* ignore unknown packet */
1529                 break;
1530         }
1531
1532         /* We take a copy of the data in the packet, so we should
1533            always free the skbuf. */
1534         return NET_RX_DROP;
1535 }