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batman-adv: drop useless argument seqno in neighbor creation
[linux-2.6.git] / net / batman-adv / bat_iv_ogm.c
blobda239c5424b8e2a3c100d55368059114a05dddd2
1 /* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors:
2 *
3 * Marek Lindner, Simon Wunderlich
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of version 2 of the GNU General Public
7 * License as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
17 * 02110-1301, USA
18 */
19
20 #include "main.h"
21 #include "translation-table.h"
22 #include "ring_buffer.h"
23 #include "originator.h"
24 #include "routing.h"
25 #include "gateway_common.h"
26 #include "gateway_client.h"
27 #include "hard-interface.h"
28 #include "send.h"
29 #include "bat_algo.h"
30 #include "network-coding.h"
31
32 static struct batadv_neigh_node *
33 batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface,
34 const uint8_t *neigh_addr,
35 struct batadv_orig_node *orig_node,
36 struct batadv_orig_node *orig_neigh)
37 {
38 struct batadv_neigh_node *neigh_node;
39
40 neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr);
41 if (!neigh_node)
42 goto out;
43
44 INIT_LIST_HEAD(&neigh_node->bonding_list);
45
46 neigh_node->orig_node = orig_neigh;
47 neigh_node->if_incoming = hard_iface;
48
49 spin_lock_bh(&orig_node->neigh_list_lock);
50 hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
51 spin_unlock_bh(&orig_node->neigh_list_lock);
52
53 out:
54 return neigh_node;
55 }
56
57 static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
58 {
59 struct batadv_ogm_packet *batadv_ogm_packet;
60 unsigned char *ogm_buff;
61 uint32_t random_seqno;
62 int res = -ENOMEM;
63
64 /* randomize initial seqno to avoid collision */
65 get_random_bytes(&random_seqno, sizeof(random_seqno));
66 atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno);
67
68 hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN;
69 ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC);
70 if (!ogm_buff)
71 goto out;
72
73 hard_iface->bat_iv.ogm_buff = ogm_buff;
74
75 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
76 batadv_ogm_packet->header.packet_type = BATADV_IV_OGM;
77 batadv_ogm_packet->header.version = BATADV_COMPAT_VERSION;
78 batadv_ogm_packet->header.ttl = 2;
79 batadv_ogm_packet->flags = BATADV_NO_FLAGS;
80 batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
81 batadv_ogm_packet->tt_num_changes = 0;
82 batadv_ogm_packet->ttvn = 0;
83
84 res = 0;
85
86 out:
87 return res;
88 }
89
90 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
91 {
92 kfree(hard_iface->bat_iv.ogm_buff);
93 hard_iface->bat_iv.ogm_buff = NULL;
94 }
95
96 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
97 {
98 struct batadv_ogm_packet *batadv_ogm_packet;
99 unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
100
101 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
102 memcpy(batadv_ogm_packet->orig,
103 hard_iface->net_dev->dev_addr, ETH_ALEN);
104 memcpy(batadv_ogm_packet->prev_sender,
105 hard_iface->net_dev->dev_addr, ETH_ALEN);
106 }
107
108 static void
109 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
110 {
111 struct batadv_ogm_packet *batadv_ogm_packet;
112 unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
113
114 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
115 batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP;
116 batadv_ogm_packet->header.ttl = BATADV_TTL;
117 }
118
119 /* when do we schedule our own ogm to be sent */
120 static unsigned long
121 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
122 {
123 unsigned int msecs;
124
125 msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
126 msecs += prandom_u32() % (2 * BATADV_JITTER);
127
128 return jiffies + msecs_to_jiffies(msecs);
129 }
130
131 /* when do we schedule a ogm packet to be sent */
132 static unsigned long batadv_iv_ogm_fwd_send_time(void)
133 {
134 return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2));
135 }
136
137 /* apply hop penalty for a normal link */
138 static uint8_t batadv_hop_penalty(uint8_t tq,
139 const struct batadv_priv *bat_priv)
140 {
141 int hop_penalty = atomic_read(&bat_priv->hop_penalty);
142 int new_tq;
143
144 new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
145 new_tq /= BATADV_TQ_MAX_VALUE;
146
147 return new_tq;
148 }
149
150 /* is there another aggregated packet here? */
151 static int batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
152 int tt_num_changes)
153 {
154 int next_buff_pos = 0;
155
156 next_buff_pos += buff_pos + BATADV_OGM_HLEN;
157 next_buff_pos += batadv_tt_len(tt_num_changes);
158
159 return (next_buff_pos <= packet_len) &&
160 (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
161 }
162
163 /* send a batman ogm to a given interface */
164 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
165 struct batadv_hard_iface *hard_iface)
166 {
167 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
168 char *fwd_str;
169 uint8_t packet_num;
170 int16_t buff_pos;
171 struct batadv_ogm_packet *batadv_ogm_packet;
172 struct sk_buff *skb;
173 uint8_t *packet_pos;
174
175 if (hard_iface->if_status != BATADV_IF_ACTIVE)
176 return;
177
178 packet_num = 0;
179 buff_pos = 0;
180 packet_pos = forw_packet->skb->data;
181 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
182
183 /* adjust all flags and log packets */
184 while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
185 batadv_ogm_packet->tt_num_changes)) {
186 /* we might have aggregated direct link packets with an
187 * ordinary base packet
188 */
189 if (forw_packet->direct_link_flags & BIT(packet_num) &&
190 forw_packet->if_incoming == hard_iface)
191 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
192 else
193 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
194
195 if (packet_num > 0 || !forw_packet->own)
196 fwd_str = "Forwarding";
197 else
198 fwd_str = "Sending own";
199
200 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
201 "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n",
202 fwd_str, (packet_num > 0 ? "aggregated " : ""),
203 batadv_ogm_packet->orig,
204 ntohl(batadv_ogm_packet->seqno),
205 batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl,
206 (batadv_ogm_packet->flags & BATADV_DIRECTLINK ?
207 "on" : "off"),
208 batadv_ogm_packet->ttvn, hard_iface->net_dev->name,
209 hard_iface->net_dev->dev_addr);
210
211 buff_pos += BATADV_OGM_HLEN;
212 buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes);
213 packet_num++;
214 packet_pos = forw_packet->skb->data + buff_pos;
215 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
216 }
217
218 /* create clone because function is called more than once */
219 skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
220 if (skb) {
221 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
222 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
223 skb->len + ETH_HLEN);
224 batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr);
225 }
226 }
227
228 /* send a batman ogm packet */
229 static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
230 {
231 struct batadv_hard_iface *hard_iface;
232 struct net_device *soft_iface;
233 struct batadv_priv *bat_priv;
234 struct batadv_hard_iface *primary_if = NULL;
235 struct batadv_ogm_packet *batadv_ogm_packet;
236 unsigned char directlink;
237 uint8_t *packet_pos;
238
239 packet_pos = forw_packet->skb->data;
240 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
241 directlink = (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0);
242
243 if (!forw_packet->if_incoming) {
244 pr_err("Error - can't forward packet: incoming iface not specified\n");
245 goto out;
246 }
247
248 soft_iface = forw_packet->if_incoming->soft_iface;
249 bat_priv = netdev_priv(soft_iface);
250
251 if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
252 goto out;
253
254 primary_if = batadv_primary_if_get_selected(bat_priv);
255 if (!primary_if)
256 goto out;
257
258 /* multihomed peer assumed
259 * non-primary OGMs are only broadcasted on their interface
260 */
261 if ((directlink && (batadv_ogm_packet->header.ttl == 1)) ||
262 (forw_packet->own && (forw_packet->if_incoming != primary_if))) {
263 /* FIXME: what about aggregated packets ? */
264 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
265 "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n",
266 (forw_packet->own ? "Sending own" : "Forwarding"),
267 batadv_ogm_packet->orig,
268 ntohl(batadv_ogm_packet->seqno),
269 batadv_ogm_packet->header.ttl,
270 forw_packet->if_incoming->net_dev->name,
271 forw_packet->if_incoming->net_dev->dev_addr);
272
273 /* skb is only used once and than forw_packet is free'd */
274 batadv_send_skb_packet(forw_packet->skb,
275 forw_packet->if_incoming,
276 batadv_broadcast_addr);
277 forw_packet->skb = NULL;
278
279 goto out;
280 }
281
282 /* broadcast on every interface */
283 rcu_read_lock();
284 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
285 if (hard_iface->soft_iface != soft_iface)
286 continue;
287
288 batadv_iv_ogm_send_to_if(forw_packet, hard_iface);
289 }
290 rcu_read_unlock();
291
292 out:
293 if (primary_if)
294 batadv_hardif_free_ref(primary_if);
295 }
296
297 /* return true if new_packet can be aggregated with forw_packet */
298 static bool
299 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
300 struct batadv_priv *bat_priv,
301 int packet_len, unsigned long send_time,
302 bool directlink,
303 const struct batadv_hard_iface *if_incoming,
304 const struct batadv_forw_packet *forw_packet)
305 {
306 struct batadv_ogm_packet *batadv_ogm_packet;
307 int aggregated_bytes = forw_packet->packet_len + packet_len;
308 struct batadv_hard_iface *primary_if = NULL;
309 bool res = false;
310 unsigned long aggregation_end_time;
311
312 batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
313 aggregation_end_time = send_time;
314 aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
315
316 /* we can aggregate the current packet to this aggregated packet
317 * if:
318 *
319 * - the send time is within our MAX_AGGREGATION_MS time
320 * - the resulting packet wont be bigger than
321 * MAX_AGGREGATION_BYTES
322 */
323 if (time_before(send_time, forw_packet->send_time) &&
324 time_after_eq(aggregation_end_time, forw_packet->send_time) &&
325 (aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) {
326 /* check aggregation compatibility
327 * -> direct link packets are broadcasted on
328 * their interface only
329 * -> aggregate packet if the current packet is
330 * a "global" packet as well as the base
331 * packet
332 */
333 primary_if = batadv_primary_if_get_selected(bat_priv);
334 if (!primary_if)
335 goto out;
336
337 /* packets without direct link flag and high TTL
338 * are flooded through the net
339 */
340 if ((!directlink) &&
341 (!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) &&
342 (batadv_ogm_packet->header.ttl != 1) &&
343
344 /* own packets originating non-primary
345 * interfaces leave only that interface
346 */
347 ((!forw_packet->own) ||
348 (forw_packet->if_incoming == primary_if))) {
349 res = true;
350 goto out;
351 }
352
353 /* if the incoming packet is sent via this one
354 * interface only - we still can aggregate
355 */
356 if ((directlink) &&
357 (new_bat_ogm_packet->header.ttl == 1) &&
358 (forw_packet->if_incoming == if_incoming) &&
359
360 /* packets from direct neighbors or
361 * own secondary interface packets
362 * (= secondary interface packets in general)
363 */
364 (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
365 (forw_packet->own &&
366 forw_packet->if_incoming != primary_if))) {
367 res = true;
368 goto out;
369 }
370 }
371
372 out:
373 if (primary_if)
374 batadv_hardif_free_ref(primary_if);
375 return res;
376 }
377
378 /* create a new aggregated packet and add this packet to it */
379 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
380 int packet_len, unsigned long send_time,
381 bool direct_link,
382 struct batadv_hard_iface *if_incoming,
383 int own_packet)
384 {
385 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
386 struct batadv_forw_packet *forw_packet_aggr;
387 unsigned char *skb_buff;
388 unsigned int skb_size;
389
390 if (!atomic_inc_not_zero(&if_incoming->refcount))
391 return;
392
393 /* own packet should always be scheduled */
394 if (!own_packet) {
395 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
396 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
397 "batman packet queue full\n");
398 goto out;
399 }
400 }
401
402 forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
403 if (!forw_packet_aggr) {
404 if (!own_packet)
405 atomic_inc(&bat_priv->batman_queue_left);
406 goto out;
407 }
408
409 if ((atomic_read(&bat_priv->aggregated_ogms)) &&
410 (packet_len < BATADV_MAX_AGGREGATION_BYTES))
411 skb_size = BATADV_MAX_AGGREGATION_BYTES;
412 else
413 skb_size = packet_len;
414
415 skb_size += ETH_HLEN + NET_IP_ALIGN;
416
417 forw_packet_aggr->skb = dev_alloc_skb(skb_size);
418 if (!forw_packet_aggr->skb) {
419 if (!own_packet)
420 atomic_inc(&bat_priv->batman_queue_left);
421 kfree(forw_packet_aggr);
422 goto out;
423 }
424 skb_reserve(forw_packet_aggr->skb, ETH_HLEN + NET_IP_ALIGN);
425
426 INIT_HLIST_NODE(&forw_packet_aggr->list);
427
428 skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
429 forw_packet_aggr->packet_len = packet_len;
430 memcpy(skb_buff, packet_buff, packet_len);
431
432 forw_packet_aggr->own = own_packet;
433 forw_packet_aggr->if_incoming = if_incoming;
434 forw_packet_aggr->num_packets = 0;
435 forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
436 forw_packet_aggr->send_time = send_time;
437
438 /* save packet direct link flag status */
439 if (direct_link)
440 forw_packet_aggr->direct_link_flags |= 1;
441
442 /* add new packet to packet list */
443 spin_lock_bh(&bat_priv->forw_bat_list_lock);
444 hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
445 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
446
447 /* start timer for this packet */
448 INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
449 batadv_send_outstanding_bat_ogm_packet);
450 queue_delayed_work(batadv_event_workqueue,
451 &forw_packet_aggr->delayed_work,
452 send_time - jiffies);
453
454 return;
455 out:
456 batadv_hardif_free_ref(if_incoming);
457 }
458
459 /* aggregate a new packet into the existing ogm packet */
460 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
461 const unsigned char *packet_buff,
462 int packet_len, bool direct_link)
463 {
464 unsigned char *skb_buff;
465 unsigned long new_direct_link_flag;
466
467 skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
468 memcpy(skb_buff, packet_buff, packet_len);
469 forw_packet_aggr->packet_len += packet_len;
470 forw_packet_aggr->num_packets++;
471
472 /* save packet direct link flag status */
473 if (direct_link) {
474 new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
475 forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
476 }
477 }
478
479 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
480 unsigned char *packet_buff,
481 int packet_len,
482 struct batadv_hard_iface *if_incoming,
483 int own_packet, unsigned long send_time)
484 {
485 /* _aggr -> pointer to the packet we want to aggregate with
486 * _pos -> pointer to the position in the queue
487 */
488 struct batadv_forw_packet *forw_packet_aggr = NULL;
489 struct batadv_forw_packet *forw_packet_pos = NULL;
490 struct batadv_ogm_packet *batadv_ogm_packet;
491 bool direct_link;
492 unsigned long max_aggregation_jiffies;
493
494 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
495 direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0;
496 max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
497
498 /* find position for the packet in the forward queue */
499 spin_lock_bh(&bat_priv->forw_bat_list_lock);
500 /* own packets are not to be aggregated */
501 if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
502 hlist_for_each_entry(forw_packet_pos,
503 &bat_priv->forw_bat_list, list) {
504 if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
505 bat_priv, packet_len,
506 send_time, direct_link,
507 if_incoming,
508 forw_packet_pos)) {
509 forw_packet_aggr = forw_packet_pos;
510 break;
511 }
512 }
513 }
514
515 /* nothing to aggregate with - either aggregation disabled or no
516 * suitable aggregation packet found
517 */
518 if (!forw_packet_aggr) {
519 /* the following section can run without the lock */
520 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
521
522 /* if we could not aggregate this packet with one of the others
523 * we hold it back for a while, so that it might be aggregated
524 * later on
525 */
526 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
527 send_time += max_aggregation_jiffies;
528
529 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
530 send_time, direct_link,
531 if_incoming, own_packet);
532 } else {
533 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
534 packet_len, direct_link);
535 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
536 }
537 }
538
539 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
540 const struct ethhdr *ethhdr,
541 struct batadv_ogm_packet *batadv_ogm_packet,
542 bool is_single_hop_neigh,
543 bool is_from_best_next_hop,
544 struct batadv_hard_iface *if_incoming)
545 {
546 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
547 uint8_t tt_num_changes;
548
549 if (batadv_ogm_packet->header.ttl <= 1) {
550 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
551 return;
552 }
553
554 if (!is_from_best_next_hop) {
555 /* Mark the forwarded packet when it is not coming from our
556 * best next hop. We still need to forward the packet for our
557 * neighbor link quality detection to work in case the packet
558 * originated from a single hop neighbor. Otherwise we can
559 * simply drop the ogm.
560 */
561 if (is_single_hop_neigh)
562 batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
563 else
564 return;
565 }
566
567 tt_num_changes = batadv_ogm_packet->tt_num_changes;
568
569 batadv_ogm_packet->header.ttl--;
570 memcpy(batadv_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
571
572 /* apply hop penalty */
573 batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
574 bat_priv);
575
576 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
577 "Forwarding packet: tq: %i, ttl: %i\n",
578 batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl);
579
580 /* switch of primaries first hop flag when forwarding */
581 batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP;
582 if (is_single_hop_neigh)
583 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
584 else
585 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
586
587 batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
588 BATADV_OGM_HLEN + batadv_tt_len(tt_num_changes),
589 if_incoming, 0, batadv_iv_ogm_fwd_send_time());
590 }
591
592 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
593 {
594 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
595 unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
596 struct batadv_ogm_packet *batadv_ogm_packet;
597 struct batadv_hard_iface *primary_if;
598 int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
599 int vis_server, tt_num_changes = 0;
600 uint32_t seqno;
601 uint8_t bandwidth;
602
603 vis_server = atomic_read(&bat_priv->vis_mode);
604 primary_if = batadv_primary_if_get_selected(bat_priv);
605
606 if (hard_iface == primary_if)
607 tt_num_changes = batadv_tt_append_diff(bat_priv, ogm_buff,
608 ogm_buff_len,
609 BATADV_OGM_HLEN);
610
611 batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
612
613 /* change sequence number to network order */
614 seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno);
615 batadv_ogm_packet->seqno = htonl(seqno);
616 atomic_inc(&hard_iface->bat_iv.ogm_seqno);
617
618 batadv_ogm_packet->ttvn = atomic_read(&bat_priv->tt.vn);
619 batadv_ogm_packet->tt_crc = htons(bat_priv->tt.local_crc);
620 if (tt_num_changes >= 0)
621 batadv_ogm_packet->tt_num_changes = tt_num_changes;
622
623 if (vis_server == BATADV_VIS_TYPE_SERVER_SYNC)
624 batadv_ogm_packet->flags |= BATADV_VIS_SERVER;
625 else
626 batadv_ogm_packet->flags &= ~BATADV_VIS_SERVER;
627
628 if (hard_iface == primary_if &&
629 atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_SERVER) {
630 bandwidth = (uint8_t)atomic_read(&bat_priv->gw_bandwidth);
631 batadv_ogm_packet->gw_flags = bandwidth;
632 } else {
633 batadv_ogm_packet->gw_flags = BATADV_NO_FLAGS;
634 }
635
636 batadv_slide_own_bcast_window(hard_iface);
637 batadv_iv_ogm_queue_add(bat_priv, hard_iface->bat_iv.ogm_buff,
638 hard_iface->bat_iv.ogm_buff_len, hard_iface, 1,
639 batadv_iv_ogm_emit_send_time(bat_priv));
640
641 if (primary_if)
642 batadv_hardif_free_ref(primary_if);
643 }
644
645 static void
646 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
647 struct batadv_orig_node *orig_node,
648 const struct ethhdr *ethhdr,
649 const struct batadv_ogm_packet *batadv_ogm_packet,
650 struct batadv_hard_iface *if_incoming,
651 const unsigned char *tt_buff,
652 int is_duplicate)
653 {
654 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
655 struct batadv_neigh_node *router = NULL;
656 struct batadv_orig_node *orig_node_tmp;
657 int if_num;
658 uint8_t sum_orig, sum_neigh;
659 uint8_t *neigh_addr;
660 uint8_t tq_avg;
661
662 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
663 "update_originator(): Searching and updating originator entry of received packet\n");
664
665 rcu_read_lock();
666 hlist_for_each_entry_rcu(tmp_neigh_node,
667 &orig_node->neigh_list, list) {
668 neigh_addr = tmp_neigh_node->addr;
669 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
670 tmp_neigh_node->if_incoming == if_incoming &&
671 atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
672 if (neigh_node)
673 batadv_neigh_node_free_ref(neigh_node);
674 neigh_node = tmp_neigh_node;
675 continue;
676 }
677
678 if (is_duplicate)
679 continue;
680
681 spin_lock_bh(&tmp_neigh_node->lq_update_lock);
682 batadv_ring_buffer_set(tmp_neigh_node->tq_recv,
683 &tmp_neigh_node->tq_index, 0);
684 tq_avg = batadv_ring_buffer_avg(tmp_neigh_node->tq_recv);
685 tmp_neigh_node->tq_avg = tq_avg;
686 spin_unlock_bh(&tmp_neigh_node->lq_update_lock);
687 }
688
689 if (!neigh_node) {
690 struct batadv_orig_node *orig_tmp;
691
692 orig_tmp = batadv_get_orig_node(bat_priv, ethhdr->h_source);
693 if (!orig_tmp)
694 goto unlock;
695
696 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
697 ethhdr->h_source,
698 orig_node, orig_tmp);
699
700 batadv_orig_node_free_ref(orig_tmp);
701 if (!neigh_node)
702 goto unlock;
703 } else
704 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
705 "Updating existing last-hop neighbor of originator\n");
706
707 rcu_read_unlock();
708
709 orig_node->flags = batadv_ogm_packet->flags;
710 neigh_node->last_seen = jiffies;
711
712 spin_lock_bh(&neigh_node->lq_update_lock);
713 batadv_ring_buffer_set(neigh_node->tq_recv,
714 &neigh_node->tq_index,
715 batadv_ogm_packet->tq);
716 neigh_node->tq_avg = batadv_ring_buffer_avg(neigh_node->tq_recv);
717 spin_unlock_bh(&neigh_node->lq_update_lock);
718
719 if (!is_duplicate) {
720 orig_node->last_ttl = batadv_ogm_packet->header.ttl;
721 neigh_node->last_ttl = batadv_ogm_packet->header.ttl;
722 }
723
724 batadv_bonding_candidate_add(orig_node, neigh_node);
725
726 /* if this neighbor already is our next hop there is nothing
727 * to change
728 */
729 router = batadv_orig_node_get_router(orig_node);
730 if (router == neigh_node)
731 goto update_tt;
732
733 /* if this neighbor does not offer a better TQ we won't consider it */
734 if (router && (router->tq_avg > neigh_node->tq_avg))
735 goto update_tt;
736
737 /* if the TQ is the same and the link not more symmetric we
738 * won't consider it either
739 */
740 if (router && (neigh_node->tq_avg == router->tq_avg)) {
741 orig_node_tmp = router->orig_node;
742 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
743 if_num = router->if_incoming->if_num;
744 sum_orig = orig_node_tmp->bcast_own_sum[if_num];
745 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
746
747 orig_node_tmp = neigh_node->orig_node;
748 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
749 if_num = neigh_node->if_incoming->if_num;
750 sum_neigh = orig_node_tmp->bcast_own_sum[if_num];
751 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
752
753 if (sum_orig >= sum_neigh)
754 goto update_tt;
755 }
756
757 batadv_update_route(bat_priv, orig_node, neigh_node);
758
759 update_tt:
760 /* I have to check for transtable changes only if the OGM has been
761 * sent through a primary interface
762 */
763 if (((batadv_ogm_packet->orig != ethhdr->h_source) &&
764 (batadv_ogm_packet->header.ttl > 2)) ||
765 (batadv_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP))
766 batadv_tt_update_orig(bat_priv, orig_node, tt_buff,
767 batadv_ogm_packet->tt_num_changes,
768 batadv_ogm_packet->ttvn,
769 ntohs(batadv_ogm_packet->tt_crc));
770
771 if (orig_node->gw_flags != batadv_ogm_packet->gw_flags)
772 batadv_gw_node_update(bat_priv, orig_node,
773 batadv_ogm_packet->gw_flags);
774
775 orig_node->gw_flags = batadv_ogm_packet->gw_flags;
776
777 /* restart gateway selection if fast or late switching was enabled */
778 if ((orig_node->gw_flags) &&
779 (atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_CLIENT) &&
780 (atomic_read(&bat_priv->gw_sel_class) > 2))
781 batadv_gw_check_election(bat_priv, orig_node);
782
783 goto out;
784
785 unlock:
786 rcu_read_unlock();
787 out:
788 if (neigh_node)
789 batadv_neigh_node_free_ref(neigh_node);
790 if (router)
791 batadv_neigh_node_free_ref(router);
792 }
793
794 static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
795 struct batadv_orig_node *orig_neigh_node,
796 struct batadv_ogm_packet *batadv_ogm_packet,
797 struct batadv_hard_iface *if_incoming)
798 {
799 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
800 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
801 uint8_t total_count;
802 uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
803 unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
804 int tq_asym_penalty, inv_asym_penalty, ret = 0;
805 unsigned int combined_tq;
806
807 /* find corresponding one hop neighbor */
808 rcu_read_lock();
809 hlist_for_each_entry_rcu(tmp_neigh_node,
810 &orig_neigh_node->neigh_list, list) {
811 if (!batadv_compare_eth(tmp_neigh_node->addr,
812 orig_neigh_node->orig))
813 continue;
814
815 if (tmp_neigh_node->if_incoming != if_incoming)
816 continue;
817
818 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
819 continue;
820
821 neigh_node = tmp_neigh_node;
822 break;
823 }
824 rcu_read_unlock();
825
826 if (!neigh_node)
827 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
828 orig_neigh_node->orig,
829 orig_neigh_node,
830 orig_neigh_node);
831
832 if (!neigh_node)
833 goto out;
834
835 /* if orig_node is direct neighbor update neigh_node last_seen */
836 if (orig_node == orig_neigh_node)
837 neigh_node->last_seen = jiffies;
838
839 orig_node->last_seen = jiffies;
840
841 /* find packet count of corresponding one hop neighbor */
842 spin_lock_bh(&orig_node->ogm_cnt_lock);
843 orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];
844 neigh_rq_count = neigh_node->real_packet_count;
845 spin_unlock_bh(&orig_node->ogm_cnt_lock);
846
847 /* pay attention to not get a value bigger than 100 % */
848 if (orig_eq_count > neigh_rq_count)
849 total_count = neigh_rq_count;
850 else
851 total_count = orig_eq_count;
852
853 /* if we have too few packets (too less data) we set tq_own to zero
854 * if we receive too few packets it is not considered bidirectional
855 */
856 if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
857 neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
858 tq_own = 0;
859 else
860 /* neigh_node->real_packet_count is never zero as we
861 * only purge old information when getting new
862 * information
863 */
864 tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count;
865
866 /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
867 * affect the nearly-symmetric links only a little, but
868 * punishes asymmetric links more. This will give a value
869 * between 0 and TQ_MAX_VALUE
870 */
871 neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
872 neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
873 neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
874 BATADV_TQ_LOCAL_WINDOW_SIZE *
875 BATADV_TQ_LOCAL_WINDOW_SIZE;
876 inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
877 inv_asym_penalty /= neigh_rq_max_cube;
878 tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
879
880 combined_tq = batadv_ogm_packet->tq * tq_own * tq_asym_penalty;
881 combined_tq /= BATADV_TQ_MAX_VALUE * BATADV_TQ_MAX_VALUE;
882 batadv_ogm_packet->tq = combined_tq;
883
884 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
885 "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n",
886 orig_node->orig, orig_neigh_node->orig, total_count,
887 neigh_rq_count, tq_own,
888 tq_asym_penalty, batadv_ogm_packet->tq);
889
890 /* if link has the minimum required transmission quality
891 * consider it bidirectional
892 */
893 if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
894 ret = 1;
895
896 out:
897 if (neigh_node)
898 batadv_neigh_node_free_ref(neigh_node);
899 return ret;
900 }
901
902 /* processes a batman packet for all interfaces, adjusts the sequence number and
903 * finds out whether it is a duplicate.
904 * returns:
905 * 1 the packet is a duplicate
906 * 0 the packet has not yet been received
907 * -1 the packet is old and has been received while the seqno window
908 * was protected. Caller should drop it.
909 */
910 static int
911 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
912 const struct batadv_ogm_packet *batadv_ogm_packet,
913 const struct batadv_hard_iface *if_incoming)
914 {
915 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
916 struct batadv_orig_node *orig_node;
917 struct batadv_neigh_node *tmp_neigh_node;
918 int is_duplicate = 0;
919 int32_t seq_diff;
920 int need_update = 0;
921 int set_mark, ret = -1;
922 uint32_t seqno = ntohl(batadv_ogm_packet->seqno);
923 uint8_t *neigh_addr;
924 uint8_t packet_count;
925
926 orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig);
927 if (!orig_node)
928 return 0;
929
930 spin_lock_bh(&orig_node->ogm_cnt_lock);
931 seq_diff = seqno - orig_node->last_real_seqno;
932
933 /* signalize caller that the packet is to be dropped. */
934 if (!hlist_empty(&orig_node->neigh_list) &&
935 batadv_window_protected(bat_priv, seq_diff,
936 &orig_node->batman_seqno_reset))
937 goto out;
938
939 rcu_read_lock();
940 hlist_for_each_entry_rcu(tmp_neigh_node,
941 &orig_node->neigh_list, list) {
942 is_duplicate |= batadv_test_bit(tmp_neigh_node->real_bits,
943 orig_node->last_real_seqno,
944 seqno);
945
946 neigh_addr = tmp_neigh_node->addr;
947 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
948 tmp_neigh_node->if_incoming == if_incoming)
949 set_mark = 1;
950 else
951 set_mark = 0;
952
953 /* if the window moved, set the update flag. */
954 need_update |= batadv_bit_get_packet(bat_priv,
955 tmp_neigh_node->real_bits,
956 seq_diff, set_mark);
957
958 packet_count = bitmap_weight(tmp_neigh_node->real_bits,
959 BATADV_TQ_LOCAL_WINDOW_SIZE);
960 tmp_neigh_node->real_packet_count = packet_count;
961 }
962 rcu_read_unlock();
963
964 if (need_update) {
965 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
966 "updating last_seqno: old %u, new %u\n",
967 orig_node->last_real_seqno, seqno);
968 orig_node->last_real_seqno = seqno;
969 }
970
971 ret = is_duplicate;
972
973 out:
974 spin_unlock_bh(&orig_node->ogm_cnt_lock);
975 batadv_orig_node_free_ref(orig_node);
976 return ret;
977 }
978
979 static void batadv_iv_ogm_process(const struct ethhdr *ethhdr,
980 struct batadv_ogm_packet *batadv_ogm_packet,
981 const unsigned char *tt_buff,
982 struct batadv_hard_iface *if_incoming)
983 {
984 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
985 struct batadv_hard_iface *hard_iface;
986 struct batadv_orig_node *orig_neigh_node, *orig_node;
987 struct batadv_neigh_node *router = NULL, *router_router = NULL;
988 struct batadv_neigh_node *orig_neigh_router = NULL;
989 int has_directlink_flag;
990 int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
991 int is_broadcast = 0, is_bidirect;
992 bool is_single_hop_neigh = false;
993 bool is_from_best_next_hop = false;
994 int is_duplicate, sameseq, simlar_ttl;
995 uint32_t if_incoming_seqno;
996 uint8_t *prev_sender;
997
998 /* Silently drop when the batman packet is actually not a
999 * correct packet.
1000 *
1001 * This might happen if a packet is padded (e.g. Ethernet has a
1002 * minimum frame length of 64 byte) and the aggregation interprets
1003 * it as an additional length.
1004 *
1005 * TODO: A more sane solution would be to have a bit in the
1006 * batadv_ogm_packet to detect whether the packet is the last
1007 * packet in an aggregation. Here we expect that the padding
1008 * is always zero (or not 0x01)
1009 */
1010 if (batadv_ogm_packet->header.packet_type != BATADV_IV_OGM)
1011 return;
1012
1013 /* could be changed by schedule_own_packet() */
1014 if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
1015
1016 if (batadv_ogm_packet->flags & BATADV_DIRECTLINK)
1017 has_directlink_flag = 1;
1018 else
1019 has_directlink_flag = 0;
1020
1021 if (batadv_compare_eth(ethhdr->h_source, batadv_ogm_packet->orig))
1022 is_single_hop_neigh = true;
1023
1024 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1025 "Received BATMAN packet via NB: %pM, IF: %s [%pM] (from OG: %pM, via prev OG: %pM, seqno %u, ttvn %u, crc %#.4x, changes %u, tq %d, TTL %d, V %d, IDF %d)\n",
1026 ethhdr->h_source, if_incoming->net_dev->name,
1027 if_incoming->net_dev->dev_addr, batadv_ogm_packet->orig,
1028 batadv_ogm_packet->prev_sender,
1029 ntohl(batadv_ogm_packet->seqno), batadv_ogm_packet->ttvn,
1030 ntohs(batadv_ogm_packet->tt_crc),
1031 batadv_ogm_packet->tt_num_changes, batadv_ogm_packet->tq,
1032 batadv_ogm_packet->header.ttl,
1033 batadv_ogm_packet->header.version, has_directlink_flag);
1034
1035 rcu_read_lock();
1036 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1037 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1038 continue;
1039
1040 if (hard_iface->soft_iface != if_incoming->soft_iface)
1041 continue;
1042
1043 if (batadv_compare_eth(ethhdr->h_source,
1044 hard_iface->net_dev->dev_addr))
1045 is_my_addr = 1;
1046
1047 if (batadv_compare_eth(batadv_ogm_packet->orig,
1048 hard_iface->net_dev->dev_addr))
1049 is_my_orig = 1;
1050
1051 if (batadv_compare_eth(batadv_ogm_packet->prev_sender,
1052 hard_iface->net_dev->dev_addr))
1053 is_my_oldorig = 1;
1054
1055 if (is_broadcast_ether_addr(ethhdr->h_source))
1056 is_broadcast = 1;
1057 }
1058 rcu_read_unlock();
1059
1060 if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) {
1061 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1062 "Drop packet: incompatible batman version (%i)\n",
1063 batadv_ogm_packet->header.version);
1064 return;
1065 }
1066
1067 if (is_my_addr) {
1068 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1069 "Drop packet: received my own broadcast (sender: %pM)\n",
1070 ethhdr->h_source);
1071 return;
1072 }
1073
1074 if (is_broadcast) {
1075 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1076 "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n",
1077 ethhdr->h_source);
1078 return;
1079 }
1080
1081 if (is_my_orig) {
1082 unsigned long *word;
1083 int offset;
1084 int32_t bit_pos;
1085 int16_t if_num;
1086 uint8_t *weight;
1087
1088 orig_neigh_node = batadv_get_orig_node(bat_priv,
1089 ethhdr->h_source);
1090 if (!orig_neigh_node)
1091 return;
1092
1093 /* neighbor has to indicate direct link and it has to
1094 * come via the corresponding interface
1095 * save packet seqno for bidirectional check
1096 */
1097 if (has_directlink_flag &&
1098 batadv_compare_eth(if_incoming->net_dev->dev_addr,
1099 batadv_ogm_packet->orig)) {
1100 if_num = if_incoming->if_num;
1101 offset = if_num * BATADV_NUM_WORDS;
1102
1103 spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
1104 word = &(orig_neigh_node->bcast_own[offset]);
1105 bit_pos = if_incoming_seqno - 2;
1106 bit_pos -= ntohl(batadv_ogm_packet->seqno);
1107 batadv_set_bit(word, bit_pos);
1108 weight = &orig_neigh_node->bcast_own_sum[if_num];
1109 *weight = bitmap_weight(word,
1110 BATADV_TQ_LOCAL_WINDOW_SIZE);
1111 spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
1112 }
1113
1114 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1115 "Drop packet: originator packet from myself (via neighbor)\n");
1116 batadv_orig_node_free_ref(orig_neigh_node);
1117 return;
1118 }
1119
1120 if (is_my_oldorig) {
1121 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1122 "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1123 ethhdr->h_source);
1124 return;
1125 }
1126
1127 if (batadv_ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
1128 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1129 "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1130 ethhdr->h_source);
1131 return;
1132 }
1133
1134 orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig);
1135 if (!orig_node)
1136 return;
1137
1138 is_duplicate = batadv_iv_ogm_update_seqnos(ethhdr, batadv_ogm_packet,
1139 if_incoming);
1140
1141 if (is_duplicate == -1) {
1142 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1143 "Drop packet: packet within seqno protection time (sender: %pM)\n",
1144 ethhdr->h_source);
1145 goto out;
1146 }
1147
1148 if (batadv_ogm_packet->tq == 0) {
1149 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1150 "Drop packet: originator packet with tq equal 0\n");
1151 goto out;
1152 }
1153
1154 router = batadv_orig_node_get_router(orig_node);
1155 if (router)
1156 router_router = batadv_orig_node_get_router(router->orig_node);
1157
1158 if ((router && router->tq_avg != 0) &&
1159 (batadv_compare_eth(router->addr, ethhdr->h_source)))
1160 is_from_best_next_hop = true;
1161
1162 prev_sender = batadv_ogm_packet->prev_sender;
1163 /* avoid temporary routing loops */
1164 if (router && router_router &&
1165 (batadv_compare_eth(router->addr, prev_sender)) &&
1166 !(batadv_compare_eth(batadv_ogm_packet->orig, prev_sender)) &&
1167 (batadv_compare_eth(router->addr, router_router->addr))) {
1168 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1169 "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1170 ethhdr->h_source);
1171 goto out;
1172 }
1173
1174 /* if sender is a direct neighbor the sender mac equals
1175 * originator mac
1176 */
1177 if (is_single_hop_neigh)
1178 orig_neigh_node = orig_node;
1179 else
1180 orig_neigh_node = batadv_get_orig_node(bat_priv,
1181 ethhdr->h_source);
1182
1183 if (!orig_neigh_node)
1184 goto out;
1185
1186 /* Update nc_nodes of the originator */
1187 batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node,
1188 batadv_ogm_packet, is_single_hop_neigh);
1189
1190 orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node);
1191
1192 /* drop packet if sender is not a direct neighbor and if we
1193 * don't route towards it
1194 */
1195 if (!is_single_hop_neigh && (!orig_neigh_router)) {
1196 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1197 "Drop packet: OGM via unknown neighbor!\n");
1198 goto out_neigh;
1199 }
1200
1201 is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1202 batadv_ogm_packet, if_incoming);
1203
1204 batadv_bonding_save_primary(orig_node, orig_neigh_node,
1205 batadv_ogm_packet);
1206
1207 /* update ranking if it is not a duplicate or has the same
1208 * seqno and similar ttl as the non-duplicate
1209 */
1210 sameseq = orig_node->last_real_seqno == ntohl(batadv_ogm_packet->seqno);
1211 simlar_ttl = orig_node->last_ttl - 3 <= batadv_ogm_packet->header.ttl;
1212 if (is_bidirect && (!is_duplicate || (sameseq && simlar_ttl)))
1213 batadv_iv_ogm_orig_update(bat_priv, orig_node, ethhdr,
1214 batadv_ogm_packet, if_incoming,
1215 tt_buff, is_duplicate);
1216
1217 /* is single hop (direct) neighbor */
1218 if (is_single_hop_neigh) {
1219 /* mark direct link on incoming interface */
1220 batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
1221 is_single_hop_neigh,
1222 is_from_best_next_hop, if_incoming);
1223
1224 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1225 "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1226 goto out_neigh;
1227 }
1228
1229 /* multihop originator */
1230 if (!is_bidirect) {
1231 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1232 "Drop packet: not received via bidirectional link\n");
1233 goto out_neigh;
1234 }
1235
1236 if (is_duplicate) {
1237 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1238 "Drop packet: duplicate packet received\n");
1239 goto out_neigh;
1240 }
1241
1242 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1243 "Forwarding packet: rebroadcast originator packet\n");
1244 batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
1245 is_single_hop_neigh, is_from_best_next_hop,
1246 if_incoming);
1247
1248 out_neigh:
1249 if ((orig_neigh_node) && (!is_single_hop_neigh))
1250 batadv_orig_node_free_ref(orig_neigh_node);
1251 out:
1252 if (router)
1253 batadv_neigh_node_free_ref(router);
1254 if (router_router)
1255 batadv_neigh_node_free_ref(router_router);
1256 if (orig_neigh_router)
1257 batadv_neigh_node_free_ref(orig_neigh_router);
1258
1259 batadv_orig_node_free_ref(orig_node);
1260 }
1261
1262 static int batadv_iv_ogm_receive(struct sk_buff *skb,
1263 struct batadv_hard_iface *if_incoming)
1264 {
1265 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1266 struct batadv_ogm_packet *batadv_ogm_packet;
1267 struct ethhdr *ethhdr;
1268 int buff_pos = 0, packet_len;
1269 unsigned char *tt_buff, *packet_buff;
1270 bool ret;
1271 uint8_t *packet_pos;
1272
1273 ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
1274 if (!ret)
1275 return NET_RX_DROP;
1276
1277 /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1278 * that does not have B.A.T.M.A.N. IV enabled ?
1279 */
1280 if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
1281 return NET_RX_DROP;
1282
1283 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1284 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
1285 skb->len + ETH_HLEN);
1286
1287 packet_len = skb_headlen(skb);
1288 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1289 packet_buff = skb->data;
1290 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
1291
1292 /* unpack the aggregated packets and process them one by one */
1293 while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len,
1294 batadv_ogm_packet->tt_num_changes)) {
1295 tt_buff = packet_buff + buff_pos + BATADV_OGM_HLEN;
1296
1297 batadv_iv_ogm_process(ethhdr, batadv_ogm_packet, tt_buff,
1298 if_incoming);
1299
1300 buff_pos += BATADV_OGM_HLEN;
1301 buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes);
1302
1303 packet_pos = packet_buff + buff_pos;
1304 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
1305 }
1306
1307 kfree_skb(skb);
1308 return NET_RX_SUCCESS;
1309 }
1310
1311 static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
1312 .name = "BATMAN_IV",
1313 .bat_iface_enable = batadv_iv_ogm_iface_enable,
1314 .bat_iface_disable = batadv_iv_ogm_iface_disable,
1315 .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
1316 .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
1317 .bat_ogm_schedule = batadv_iv_ogm_schedule,
1318 .bat_ogm_emit = batadv_iv_ogm_emit,
1319 };
1320
1321 int __init batadv_iv_init(void)
1322 {
1323 int ret;
1324
1325 /* batman originator packet */
1326 ret = batadv_recv_handler_register(BATADV_IV_OGM,
1327 batadv_iv_ogm_receive);
1328 if (ret < 0)
1329 goto out;
1330
1331 ret = batadv_algo_register(&batadv_batman_iv);
1332 if (ret < 0)
1333 goto handler_unregister;
1334
1335 goto out;
1336
1337 handler_unregister:
1338 batadv_recv_handler_unregister(BATADV_IV_OGM);
1339 out:
1340 return ret;
1341 }
Linus' kernel tree