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batman-adv: Prefix packet structs with batadv_
[deliverable/linux.git] / net / batman-adv / bat_iv_ogm.c
1 /* Copyright (C) 2007-2012 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
31 static struct neigh_node *batadv_iv_ogm_neigh_new(struct hard_iface *hard_iface,
32 const uint8_t *neigh_addr,
33 struct orig_node *orig_node,
34 struct orig_node *orig_neigh,
35 __be32 seqno)
36 {
37 struct neigh_node *neigh_node;
38
39 neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr,
40 ntohl(seqno));
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 hard_iface *hard_iface)
58 {
59 struct batadv_ogm_packet *batadv_ogm_packet;
60 uint32_t random_seqno;
61 int res = -ENOMEM;
62
63 /* randomize initial seqno to avoid collision */
64 get_random_bytes(&random_seqno, sizeof(random_seqno));
65 atomic_set(&hard_iface->seqno, random_seqno);
66
67 hard_iface->packet_len = BATADV_OGM_HLEN;
68 hard_iface->packet_buff = kmalloc(hard_iface->packet_len, GFP_ATOMIC);
69
70 if (!hard_iface->packet_buff)
71 goto out;
72
73 batadv_ogm_packet = (struct batadv_ogm_packet *)hard_iface->packet_buff;
74 batadv_ogm_packet->header.packet_type = BATADV_IV_OGM;
75 batadv_ogm_packet->header.version = BATADV_COMPAT_VERSION;
76 batadv_ogm_packet->header.ttl = 2;
77 batadv_ogm_packet->flags = BATADV_NO_FLAGS;
78 batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
79 batadv_ogm_packet->tt_num_changes = 0;
80 batadv_ogm_packet->ttvn = 0;
81
82 res = 0;
83
84 out:
85 return res;
86 }
87
88 static void batadv_iv_ogm_iface_disable(struct hard_iface *hard_iface)
89 {
90 kfree(hard_iface->packet_buff);
91 hard_iface->packet_buff = NULL;
92 }
93
94 static void batadv_iv_ogm_iface_update_mac(struct hard_iface *hard_iface)
95 {
96 struct batadv_ogm_packet *batadv_ogm_packet;
97
98 batadv_ogm_packet = (struct batadv_ogm_packet *)hard_iface->packet_buff;
99 memcpy(batadv_ogm_packet->orig,
100 hard_iface->net_dev->dev_addr, ETH_ALEN);
101 memcpy(batadv_ogm_packet->prev_sender,
102 hard_iface->net_dev->dev_addr, ETH_ALEN);
103 }
104
105 static void batadv_iv_ogm_primary_iface_set(struct hard_iface *hard_iface)
106 {
107 struct batadv_ogm_packet *batadv_ogm_packet;
108
109 batadv_ogm_packet = (struct batadv_ogm_packet *)hard_iface->packet_buff;
110 batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP;
111 batadv_ogm_packet->header.ttl = BATADV_TTL;
112 }
113
114 /* when do we schedule our own ogm to be sent */
115 static unsigned long
116 batadv_iv_ogm_emit_send_time(const struct bat_priv *bat_priv)
117 {
118 unsigned int msecs;
119
120 msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
121 msecs += (random32() % 2 * BATADV_JITTER);
122
123 return jiffies + msecs_to_jiffies(msecs);
124 }
125
126 /* when do we schedule a ogm packet to be sent */
127 static unsigned long batadv_iv_ogm_fwd_send_time(void)
128 {
129 return jiffies + msecs_to_jiffies(random32() % (BATADV_JITTER / 2));
130 }
131
132 /* apply hop penalty for a normal link */
133 static uint8_t batadv_hop_penalty(uint8_t tq, const struct bat_priv *bat_priv)
134 {
135 int hop_penalty = atomic_read(&bat_priv->hop_penalty);
136 int new_tq;
137
138 new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
139 new_tq /= BATADV_TQ_MAX_VALUE;
140
141 return new_tq;
142 }
143
144 /* is there another aggregated packet here? */
145 static int batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
146 int tt_num_changes)
147 {
148 int next_buff_pos = 0;
149
150 next_buff_pos += buff_pos + BATADV_OGM_HLEN;
151 next_buff_pos += batadv_tt_len(tt_num_changes);
152
153 return (next_buff_pos <= packet_len) &&
154 (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
155 }
156
157 /* send a batman ogm to a given interface */
158 static void batadv_iv_ogm_send_to_if(struct forw_packet *forw_packet,
159 struct hard_iface *hard_iface)
160 {
161 struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
162 char *fwd_str;
163 uint8_t packet_num;
164 int16_t buff_pos;
165 struct batadv_ogm_packet *batadv_ogm_packet;
166 struct sk_buff *skb;
167
168 if (hard_iface->if_status != BATADV_IF_ACTIVE)
169 return;
170
171 packet_num = 0;
172 buff_pos = 0;
173 batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
174
175 /* adjust all flags and log packets */
176 while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
177 batadv_ogm_packet->tt_num_changes)) {
178
179 /* we might have aggregated direct link packets with an
180 * ordinary base packet
181 */
182 if ((forw_packet->direct_link_flags & (1 << packet_num)) &&
183 (forw_packet->if_incoming == hard_iface))
184 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
185 else
186 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
187
188 fwd_str = (packet_num > 0 ? "Forwarding" : (forw_packet->own ?
189 "Sending own" :
190 "Forwarding"));
191 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
192 "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n",
193 fwd_str, (packet_num > 0 ? "aggregated " : ""),
194 batadv_ogm_packet->orig,
195 ntohl(batadv_ogm_packet->seqno),
196 batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl,
197 (batadv_ogm_packet->flags & BATADV_DIRECTLINK ?
198 "on" : "off"),
199 batadv_ogm_packet->ttvn, hard_iface->net_dev->name,
200 hard_iface->net_dev->dev_addr);
201
202 buff_pos += BATADV_OGM_HLEN;
203 buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes);
204 packet_num++;
205 batadv_ogm_packet = (struct batadv_ogm_packet *)
206 (forw_packet->skb->data + buff_pos);
207 }
208
209 /* create clone because function is called more than once */
210 skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
211 if (skb) {
212 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
213 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
214 skb->len + ETH_HLEN);
215 batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr);
216 }
217 }
218
219 /* send a batman ogm packet */
220 static void batadv_iv_ogm_emit(struct forw_packet *forw_packet)
221 {
222 struct hard_iface *hard_iface;
223 struct net_device *soft_iface;
224 struct bat_priv *bat_priv;
225 struct hard_iface *primary_if = NULL;
226 struct batadv_ogm_packet *batadv_ogm_packet;
227 unsigned char directlink;
228
229 batadv_ogm_packet = (struct batadv_ogm_packet *)
230 (forw_packet->skb->data);
231 directlink = (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0);
232
233 if (!forw_packet->if_incoming) {
234 pr_err("Error - can't forward packet: incoming iface not specified\n");
235 goto out;
236 }
237
238 soft_iface = forw_packet->if_incoming->soft_iface;
239 bat_priv = netdev_priv(soft_iface);
240
241 if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
242 goto out;
243
244 primary_if = batadv_primary_if_get_selected(bat_priv);
245 if (!primary_if)
246 goto out;
247
248 /* multihomed peer assumed
249 * non-primary OGMs are only broadcasted on their interface
250 */
251 if ((directlink && (batadv_ogm_packet->header.ttl == 1)) ||
252 (forw_packet->own && (forw_packet->if_incoming != primary_if))) {
253
254 /* FIXME: what about aggregated packets ? */
255 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
256 "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n",
257 (forw_packet->own ? "Sending own" : "Forwarding"),
258 batadv_ogm_packet->orig,
259 ntohl(batadv_ogm_packet->seqno),
260 batadv_ogm_packet->header.ttl,
261 forw_packet->if_incoming->net_dev->name,
262 forw_packet->if_incoming->net_dev->dev_addr);
263
264 /* skb is only used once and than forw_packet is free'd */
265 batadv_send_skb_packet(forw_packet->skb,
266 forw_packet->if_incoming,
267 batadv_broadcast_addr);
268 forw_packet->skb = NULL;
269
270 goto out;
271 }
272
273 /* broadcast on every interface */
274 rcu_read_lock();
275 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
276 if (hard_iface->soft_iface != soft_iface)
277 continue;
278
279 batadv_iv_ogm_send_to_if(forw_packet, hard_iface);
280 }
281 rcu_read_unlock();
282
283 out:
284 if (primary_if)
285 batadv_hardif_free_ref(primary_if);
286 }
287
288 /* return true if new_packet can be aggregated with forw_packet */
289 static bool
290 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
291 struct bat_priv *bat_priv,
292 int packet_len, unsigned long send_time,
293 bool directlink,
294 const struct hard_iface *if_incoming,
295 const struct forw_packet *forw_packet)
296 {
297 struct batadv_ogm_packet *batadv_ogm_packet;
298 int aggregated_bytes = forw_packet->packet_len + packet_len;
299 struct hard_iface *primary_if = NULL;
300 bool res = false;
301 unsigned long aggregation_end_time;
302
303 batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
304 aggregation_end_time = send_time;
305 aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
306
307 /* we can aggregate the current packet to this aggregated packet
308 * if:
309 *
310 * - the send time is within our MAX_AGGREGATION_MS time
311 * - the resulting packet wont be bigger than
312 * MAX_AGGREGATION_BYTES
313 */
314 if (time_before(send_time, forw_packet->send_time) &&
315 time_after_eq(aggregation_end_time, forw_packet->send_time) &&
316 (aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) {
317
318 /* check aggregation compatibility
319 * -> direct link packets are broadcasted on
320 * their interface only
321 * -> aggregate packet if the current packet is
322 * a "global" packet as well as the base
323 * packet
324 */
325 primary_if = batadv_primary_if_get_selected(bat_priv);
326 if (!primary_if)
327 goto out;
328
329 /* packets without direct link flag and high TTL
330 * are flooded through the net
331 */
332 if ((!directlink) &&
333 (!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) &&
334 (batadv_ogm_packet->header.ttl != 1) &&
335
336 /* own packets originating non-primary
337 * interfaces leave only that interface
338 */
339 ((!forw_packet->own) ||
340 (forw_packet->if_incoming == primary_if))) {
341 res = true;
342 goto out;
343 }
344
345 /* if the incoming packet is sent via this one
346 * interface only - we still can aggregate
347 */
348 if ((directlink) &&
349 (new_bat_ogm_packet->header.ttl == 1) &&
350 (forw_packet->if_incoming == if_incoming) &&
351
352 /* packets from direct neighbors or
353 * own secondary interface packets
354 * (= secondary interface packets in general)
355 */
356 (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
357 (forw_packet->own &&
358 forw_packet->if_incoming != primary_if))) {
359 res = true;
360 goto out;
361 }
362 }
363
364 out:
365 if (primary_if)
366 batadv_hardif_free_ref(primary_if);
367 return res;
368 }
369
370 /* create a new aggregated packet and add this packet to it */
371 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
372 int packet_len, unsigned long send_time,
373 bool direct_link,
374 struct hard_iface *if_incoming,
375 int own_packet)
376 {
377 struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
378 struct forw_packet *forw_packet_aggr;
379 unsigned char *skb_buff;
380 unsigned int skb_size;
381
382 if (!atomic_inc_not_zero(&if_incoming->refcount))
383 return;
384
385 /* own packet should always be scheduled */
386 if (!own_packet) {
387 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
388 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
389 "batman packet queue full\n");
390 goto out;
391 }
392 }
393
394 forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
395 if (!forw_packet_aggr) {
396 if (!own_packet)
397 atomic_inc(&bat_priv->batman_queue_left);
398 goto out;
399 }
400
401 if ((atomic_read(&bat_priv->aggregated_ogms)) &&
402 (packet_len < BATADV_MAX_AGGREGATION_BYTES))
403 skb_size = BATADV_MAX_AGGREGATION_BYTES + ETH_HLEN;
404 else
405 skb_size = packet_len + ETH_HLEN;
406
407 forw_packet_aggr->skb = dev_alloc_skb(skb_size);
408 if (!forw_packet_aggr->skb) {
409 if (!own_packet)
410 atomic_inc(&bat_priv->batman_queue_left);
411 kfree(forw_packet_aggr);
412 goto out;
413 }
414 skb_reserve(forw_packet_aggr->skb, ETH_HLEN);
415
416 INIT_HLIST_NODE(&forw_packet_aggr->list);
417
418 skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
419 forw_packet_aggr->packet_len = packet_len;
420 memcpy(skb_buff, packet_buff, packet_len);
421
422 forw_packet_aggr->own = own_packet;
423 forw_packet_aggr->if_incoming = if_incoming;
424 forw_packet_aggr->num_packets = 0;
425 forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
426 forw_packet_aggr->send_time = send_time;
427
428 /* save packet direct link flag status */
429 if (direct_link)
430 forw_packet_aggr->direct_link_flags |= 1;
431
432 /* add new packet to packet list */
433 spin_lock_bh(&bat_priv->forw_bat_list_lock);
434 hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
435 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
436
437 /* start timer for this packet */
438 INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
439 batadv_send_outstanding_bat_ogm_packet);
440 queue_delayed_work(batadv_event_workqueue,
441 &forw_packet_aggr->delayed_work,
442 send_time - jiffies);
443
444 return;
445 out:
446 batadv_hardif_free_ref(if_incoming);
447 }
448
449 /* aggregate a new packet into the existing ogm packet */
450 static void batadv_iv_ogm_aggregate(struct forw_packet *forw_packet_aggr,
451 const unsigned char *packet_buff,
452 int packet_len, bool direct_link)
453 {
454 unsigned char *skb_buff;
455
456 skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
457 memcpy(skb_buff, packet_buff, packet_len);
458 forw_packet_aggr->packet_len += packet_len;
459 forw_packet_aggr->num_packets++;
460
461 /* save packet direct link flag status */
462 if (direct_link)
463 forw_packet_aggr->direct_link_flags |=
464 (1 << forw_packet_aggr->num_packets);
465 }
466
467 static void batadv_iv_ogm_queue_add(struct bat_priv *bat_priv,
468 unsigned char *packet_buff,
469 int packet_len,
470 struct hard_iface *if_incoming,
471 int own_packet, unsigned long send_time)
472 {
473 /* _aggr -> pointer to the packet we want to aggregate with
474 * _pos -> pointer to the position in the queue
475 */
476 struct forw_packet *forw_packet_aggr = NULL, *forw_packet_pos = NULL;
477 struct hlist_node *tmp_node;
478 struct batadv_ogm_packet *batadv_ogm_packet;
479 bool direct_link;
480 unsigned long max_aggregation_jiffies;
481
482 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
483 direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0;
484 max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
485
486 /* find position for the packet in the forward queue */
487 spin_lock_bh(&bat_priv->forw_bat_list_lock);
488 /* own packets are not to be aggregated */
489 if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
490 hlist_for_each_entry(forw_packet_pos, tmp_node,
491 &bat_priv->forw_bat_list, list) {
492 if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
493 bat_priv, packet_len,
494 send_time, direct_link,
495 if_incoming,
496 forw_packet_pos)) {
497 forw_packet_aggr = forw_packet_pos;
498 break;
499 }
500 }
501 }
502
503 /* nothing to aggregate with - either aggregation disabled or no
504 * suitable aggregation packet found
505 */
506 if (!forw_packet_aggr) {
507 /* the following section can run without the lock */
508 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
509
510 /* if we could not aggregate this packet with one of the others
511 * we hold it back for a while, so that it might be aggregated
512 * later on
513 */
514 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
515 send_time += max_aggregation_jiffies;
516
517 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
518 send_time, direct_link,
519 if_incoming, own_packet);
520 } else {
521 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
522 packet_len, direct_link);
523 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
524 }
525 }
526
527 static void batadv_iv_ogm_forward(struct orig_node *orig_node,
528 const struct ethhdr *ethhdr,
529 struct batadv_ogm_packet *batadv_ogm_packet,
530 bool is_single_hop_neigh,
531 bool is_from_best_next_hop,
532 struct hard_iface *if_incoming)
533 {
534 struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
535 uint8_t tt_num_changes;
536
537 if (batadv_ogm_packet->header.ttl <= 1) {
538 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
539 return;
540 }
541
542 if (!is_from_best_next_hop) {
543 /* Mark the forwarded packet when it is not coming from our
544 * best next hop. We still need to forward the packet for our
545 * neighbor link quality detection to work in case the packet
546 * originated from a single hop neighbor. Otherwise we can
547 * simply drop the ogm.
548 */
549 if (is_single_hop_neigh)
550 batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
551 else
552 return;
553 }
554
555 tt_num_changes = batadv_ogm_packet->tt_num_changes;
556
557 batadv_ogm_packet->header.ttl--;
558 memcpy(batadv_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
559
560 /* apply hop penalty */
561 batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
562 bat_priv);
563
564 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
565 "Forwarding packet: tq: %i, ttl: %i\n",
566 batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl);
567
568 /* switch of primaries first hop flag when forwarding */
569 batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP;
570 if (is_single_hop_neigh)
571 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
572 else
573 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
574
575 batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
576 BATADV_OGM_HLEN + batadv_tt_len(tt_num_changes),
577 if_incoming, 0, batadv_iv_ogm_fwd_send_time());
578 }
579
580 static void batadv_iv_ogm_schedule(struct hard_iface *hard_iface)
581 {
582 struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
583 struct batadv_ogm_packet *batadv_ogm_packet;
584 struct hard_iface *primary_if;
585 int vis_server, tt_num_changes = 0;
586
587 vis_server = atomic_read(&bat_priv->vis_mode);
588 primary_if = batadv_primary_if_get_selected(bat_priv);
589
590 if (hard_iface == primary_if)
591 tt_num_changes = batadv_tt_append_diff(bat_priv,
592 &hard_iface->packet_buff,
593 &hard_iface->packet_len,
594 BATADV_OGM_HLEN);
595
596 batadv_ogm_packet = (struct batadv_ogm_packet *)hard_iface->packet_buff;
597
598 /* change sequence number to network order */
599 batadv_ogm_packet->seqno =
600 htonl((uint32_t)atomic_read(&hard_iface->seqno));
601 atomic_inc(&hard_iface->seqno);
602
603 batadv_ogm_packet->ttvn = atomic_read(&bat_priv->ttvn);
604 batadv_ogm_packet->tt_crc = htons(bat_priv->tt_crc);
605 if (tt_num_changes >= 0)
606 batadv_ogm_packet->tt_num_changes = tt_num_changes;
607
608 if (vis_server == BATADV_VIS_TYPE_SERVER_SYNC)
609 batadv_ogm_packet->flags |= BATADV_VIS_SERVER;
610 else
611 batadv_ogm_packet->flags &= ~BATADV_VIS_SERVER;
612
613 if ((hard_iface == primary_if) &&
614 (atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_SERVER))
615 batadv_ogm_packet->gw_flags =
616 (uint8_t)atomic_read(&bat_priv->gw_bandwidth);
617 else
618 batadv_ogm_packet->gw_flags = BATADV_NO_FLAGS;
619
620 batadv_slide_own_bcast_window(hard_iface);
621 batadv_iv_ogm_queue_add(bat_priv, hard_iface->packet_buff,
622 hard_iface->packet_len, hard_iface, 1,
623 batadv_iv_ogm_emit_send_time(bat_priv));
624
625 if (primary_if)
626 batadv_hardif_free_ref(primary_if);
627 }
628
629 static void
630 batadv_iv_ogm_orig_update(struct bat_priv *bat_priv,
631 struct orig_node *orig_node,
632 const struct ethhdr *ethhdr,
633 const struct batadv_ogm_packet *batadv_ogm_packet,
634 struct hard_iface *if_incoming,
635 const unsigned char *tt_buff,
636 int is_duplicate)
637 {
638 struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
639 struct neigh_node *router = NULL;
640 struct orig_node *orig_node_tmp;
641 struct hlist_node *node;
642 uint8_t bcast_own_sum_orig, bcast_own_sum_neigh;
643 uint8_t *neigh_addr;
644
645 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
646 "update_originator(): Searching and updating originator entry of received packet\n");
647
648 rcu_read_lock();
649 hlist_for_each_entry_rcu(tmp_neigh_node, node,
650 &orig_node->neigh_list, list) {
651 neigh_addr = tmp_neigh_node->addr;
652 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
653 tmp_neigh_node->if_incoming == if_incoming &&
654 atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
655 if (neigh_node)
656 batadv_neigh_node_free_ref(neigh_node);
657 neigh_node = tmp_neigh_node;
658 continue;
659 }
660
661 if (is_duplicate)
662 continue;
663
664 spin_lock_bh(&tmp_neigh_node->lq_update_lock);
665 batadv_ring_buffer_set(tmp_neigh_node->tq_recv,
666 &tmp_neigh_node->tq_index, 0);
667 tmp_neigh_node->tq_avg =
668 batadv_ring_buffer_avg(tmp_neigh_node->tq_recv);
669 spin_unlock_bh(&tmp_neigh_node->lq_update_lock);
670 }
671
672 if (!neigh_node) {
673 struct orig_node *orig_tmp;
674
675 orig_tmp = batadv_get_orig_node(bat_priv, ethhdr->h_source);
676 if (!orig_tmp)
677 goto unlock;
678
679 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
680 ethhdr->h_source,
681 orig_node, orig_tmp,
682 batadv_ogm_packet->seqno);
683
684 batadv_orig_node_free_ref(orig_tmp);
685 if (!neigh_node)
686 goto unlock;
687 } else
688 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
689 "Updating existing last-hop neighbor of originator\n");
690
691 rcu_read_unlock();
692
693 orig_node->flags = batadv_ogm_packet->flags;
694 neigh_node->last_seen = jiffies;
695
696 spin_lock_bh(&neigh_node->lq_update_lock);
697 batadv_ring_buffer_set(neigh_node->tq_recv,
698 &neigh_node->tq_index,
699 batadv_ogm_packet->tq);
700 neigh_node->tq_avg = batadv_ring_buffer_avg(neigh_node->tq_recv);
701 spin_unlock_bh(&neigh_node->lq_update_lock);
702
703 if (!is_duplicate) {
704 orig_node->last_ttl = batadv_ogm_packet->header.ttl;
705 neigh_node->last_ttl = batadv_ogm_packet->header.ttl;
706 }
707
708 batadv_bonding_candidate_add(orig_node, neigh_node);
709
710 /* if this neighbor already is our next hop there is nothing
711 * to change
712 */
713 router = batadv_orig_node_get_router(orig_node);
714 if (router == neigh_node)
715 goto update_tt;
716
717 /* if this neighbor does not offer a better TQ we won't consider it */
718 if (router && (router->tq_avg > neigh_node->tq_avg))
719 goto update_tt;
720
721 /* if the TQ is the same and the link not more symmetric we
722 * won't consider it either
723 */
724 if (router && (neigh_node->tq_avg == router->tq_avg)) {
725 orig_node_tmp = router->orig_node;
726 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
727 bcast_own_sum_orig =
728 orig_node_tmp->bcast_own_sum[if_incoming->if_num];
729 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
730
731 orig_node_tmp = neigh_node->orig_node;
732 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
733 bcast_own_sum_neigh =
734 orig_node_tmp->bcast_own_sum[if_incoming->if_num];
735 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
736
737 if (bcast_own_sum_orig >= bcast_own_sum_neigh)
738 goto update_tt;
739 }
740
741 batadv_update_route(bat_priv, orig_node, neigh_node);
742
743 update_tt:
744 /* I have to check for transtable changes only if the OGM has been
745 * sent through a primary interface
746 */
747 if (((batadv_ogm_packet->orig != ethhdr->h_source) &&
748 (batadv_ogm_packet->header.ttl > 2)) ||
749 (batadv_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP))
750 batadv_tt_update_orig(bat_priv, orig_node, tt_buff,
751 batadv_ogm_packet->tt_num_changes,
752 batadv_ogm_packet->ttvn,
753 ntohs(batadv_ogm_packet->tt_crc));
754
755 if (orig_node->gw_flags != batadv_ogm_packet->gw_flags)
756 batadv_gw_node_update(bat_priv, orig_node,
757 batadv_ogm_packet->gw_flags);
758
759 orig_node->gw_flags = batadv_ogm_packet->gw_flags;
760
761 /* restart gateway selection if fast or late switching was enabled */
762 if ((orig_node->gw_flags) &&
763 (atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_CLIENT) &&
764 (atomic_read(&bat_priv->gw_sel_class) > 2))
765 batadv_gw_check_election(bat_priv, orig_node);
766
767 goto out;
768
769 unlock:
770 rcu_read_unlock();
771 out:
772 if (neigh_node)
773 batadv_neigh_node_free_ref(neigh_node);
774 if (router)
775 batadv_neigh_node_free_ref(router);
776 }
777
778 static int batadv_iv_ogm_calc_tq(struct orig_node *orig_node,
779 struct orig_node *orig_neigh_node,
780 struct batadv_ogm_packet *batadv_ogm_packet,
781 struct hard_iface *if_incoming)
782 {
783 struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
784 struct neigh_node *neigh_node = NULL, *tmp_neigh_node;
785 struct hlist_node *node;
786 uint8_t total_count;
787 uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
788 unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
789 int tq_asym_penalty, inv_asym_penalty, ret = 0;
790 unsigned int combined_tq;
791
792 /* find corresponding one hop neighbor */
793 rcu_read_lock();
794 hlist_for_each_entry_rcu(tmp_neigh_node, node,
795 &orig_neigh_node->neigh_list, list) {
796
797 if (!batadv_compare_eth(tmp_neigh_node->addr,
798 orig_neigh_node->orig))
799 continue;
800
801 if (tmp_neigh_node->if_incoming != if_incoming)
802 continue;
803
804 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
805 continue;
806
807 neigh_node = tmp_neigh_node;
808 break;
809 }
810 rcu_read_unlock();
811
812 if (!neigh_node)
813 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
814 orig_neigh_node->orig,
815 orig_neigh_node,
816 orig_neigh_node,
817 batadv_ogm_packet->seqno);
818
819 if (!neigh_node)
820 goto out;
821
822 /* if orig_node is direct neighbor update neigh_node last_seen */
823 if (orig_node == orig_neigh_node)
824 neigh_node->last_seen = jiffies;
825
826 orig_node->last_seen = jiffies;
827
828 /* find packet count of corresponding one hop neighbor */
829 spin_lock_bh(&orig_node->ogm_cnt_lock);
830 orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];
831 neigh_rq_count = neigh_node->real_packet_count;
832 spin_unlock_bh(&orig_node->ogm_cnt_lock);
833
834 /* pay attention to not get a value bigger than 100 % */
835 total_count = (orig_eq_count > neigh_rq_count ?
836 neigh_rq_count : orig_eq_count);
837
838 /* if we have too few packets (too less data) we set tq_own to zero
839 * if we receive too few packets it is not considered bidirectional
840 */
841 if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
842 neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
843 tq_own = 0;
844 else
845 /* neigh_node->real_packet_count is never zero as we
846 * only purge old information when getting new
847 * information
848 */
849 tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count;
850
851 /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
852 * affect the nearly-symmetric links only a little, but
853 * punishes asymmetric links more. This will give a value
854 * between 0 and TQ_MAX_VALUE
855 */
856 neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
857 neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
858 neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
859 BATADV_TQ_LOCAL_WINDOW_SIZE *
860 BATADV_TQ_LOCAL_WINDOW_SIZE;
861 inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
862 inv_asym_penalty /= neigh_rq_max_cube;
863 tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
864
865 combined_tq = batadv_ogm_packet->tq * tq_own * tq_asym_penalty;
866 combined_tq /= BATADV_TQ_MAX_VALUE * BATADV_TQ_MAX_VALUE;
867 batadv_ogm_packet->tq = combined_tq;
868
869 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
870 "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n",
871 orig_node->orig, orig_neigh_node->orig, total_count,
872 neigh_rq_count, tq_own,
873 tq_asym_penalty, batadv_ogm_packet->tq);
874
875 /* if link has the minimum required transmission quality
876 * consider it bidirectional
877 */
878 if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
879 ret = 1;
880
881 out:
882 if (neigh_node)
883 batadv_neigh_node_free_ref(neigh_node);
884 return ret;
885 }
886
887 /* processes a batman packet for all interfaces, adjusts the sequence number and
888 * finds out whether it is a duplicate.
889 * returns:
890 * 1 the packet is a duplicate
891 * 0 the packet has not yet been received
892 * -1 the packet is old and has been received while the seqno window
893 * was protected. Caller should drop it.
894 */
895 static int
896 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
897 const struct batadv_ogm_packet *batadv_ogm_packet,
898 const struct hard_iface *if_incoming)
899 {
900 struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
901 struct orig_node *orig_node;
902 struct neigh_node *tmp_neigh_node;
903 struct hlist_node *node;
904 int is_duplicate = 0;
905 int32_t seq_diff;
906 int need_update = 0;
907 int set_mark, ret = -1;
908 uint32_t seqno = ntohl(batadv_ogm_packet->seqno);
909 uint8_t *neigh_addr;
910
911 orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig);
912 if (!orig_node)
913 return 0;
914
915 spin_lock_bh(&orig_node->ogm_cnt_lock);
916 seq_diff = seqno - orig_node->last_real_seqno;
917
918 /* signalize caller that the packet is to be dropped. */
919 if (!hlist_empty(&orig_node->neigh_list) &&
920 batadv_window_protected(bat_priv, seq_diff,
921 &orig_node->batman_seqno_reset))
922 goto out;
923
924 rcu_read_lock();
925 hlist_for_each_entry_rcu(tmp_neigh_node, node,
926 &orig_node->neigh_list, list) {
927
928 is_duplicate |= batadv_test_bit(tmp_neigh_node->real_bits,
929 orig_node->last_real_seqno,
930 seqno);
931
932 neigh_addr = tmp_neigh_node->addr;
933 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
934 tmp_neigh_node->if_incoming == if_incoming)
935 set_mark = 1;
936 else
937 set_mark = 0;
938
939 /* if the window moved, set the update flag. */
940 need_update |= batadv_bit_get_packet(bat_priv,
941 tmp_neigh_node->real_bits,
942 seq_diff, set_mark);
943
944 tmp_neigh_node->real_packet_count =
945 bitmap_weight(tmp_neigh_node->real_bits,
946 BATADV_TQ_LOCAL_WINDOW_SIZE);
947 }
948 rcu_read_unlock();
949
950 if (need_update) {
951 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
952 "updating last_seqno: old %u, new %u\n",
953 orig_node->last_real_seqno, seqno);
954 orig_node->last_real_seqno = seqno;
955 }
956
957 ret = is_duplicate;
958
959 out:
960 spin_unlock_bh(&orig_node->ogm_cnt_lock);
961 batadv_orig_node_free_ref(orig_node);
962 return ret;
963 }
964
965 static void batadv_iv_ogm_process(const struct ethhdr *ethhdr,
966 struct batadv_ogm_packet *batadv_ogm_packet,
967 const unsigned char *tt_buff,
968 struct hard_iface *if_incoming)
969 {
970 struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
971 struct hard_iface *hard_iface;
972 struct orig_node *orig_neigh_node, *orig_node;
973 struct neigh_node *router = NULL, *router_router = NULL;
974 struct neigh_node *orig_neigh_router = NULL;
975 int has_directlink_flag;
976 int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
977 int is_broadcast = 0, is_bidirect;
978 bool is_single_hop_neigh = false;
979 bool is_from_best_next_hop = false;
980 int is_duplicate, sameseq, simlar_ttl;
981 uint32_t if_incoming_seqno;
982 uint8_t *prev_sender;
983
984 /* Silently drop when the batman packet is actually not a
985 * correct packet.
986 *
987 * This might happen if a packet is padded (e.g. Ethernet has a
988 * minimum frame length of 64 byte) and the aggregation interprets
989 * it as an additional length.
990 *
991 * TODO: A more sane solution would be to have a bit in the
992 * batadv_ogm_packet to detect whether the packet is the last
993 * packet in an aggregation. Here we expect that the padding
994 * is always zero (or not 0x01)
995 */
996 if (batadv_ogm_packet->header.packet_type != BATADV_IV_OGM)
997 return;
998
999 /* could be changed by schedule_own_packet() */
1000 if_incoming_seqno = atomic_read(&if_incoming->seqno);
1001
1002 if (batadv_ogm_packet->flags & BATADV_DIRECTLINK)
1003 has_directlink_flag = 1;
1004 else
1005 has_directlink_flag = 0;
1006
1007 if (batadv_compare_eth(ethhdr->h_source, batadv_ogm_packet->orig))
1008 is_single_hop_neigh = true;
1009
1010 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1011 "Received BATMAN packet via NB: %pM, IF: %s [%pM] (from OG: %pM, via prev OG: %pM, seqno %u, ttvn %u, crc %u, changes %u, td %d, TTL %d, V %d, IDF %d)\n",
1012 ethhdr->h_source, if_incoming->net_dev->name,
1013 if_incoming->net_dev->dev_addr, batadv_ogm_packet->orig,
1014 batadv_ogm_packet->prev_sender,
1015 ntohl(batadv_ogm_packet->seqno), batadv_ogm_packet->ttvn,
1016 ntohs(batadv_ogm_packet->tt_crc),
1017 batadv_ogm_packet->tt_num_changes, batadv_ogm_packet->tq,
1018 batadv_ogm_packet->header.ttl,
1019 batadv_ogm_packet->header.version, has_directlink_flag);
1020
1021 rcu_read_lock();
1022 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1023 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1024 continue;
1025
1026 if (hard_iface->soft_iface != if_incoming->soft_iface)
1027 continue;
1028
1029 if (batadv_compare_eth(ethhdr->h_source,
1030 hard_iface->net_dev->dev_addr))
1031 is_my_addr = 1;
1032
1033 if (batadv_compare_eth(batadv_ogm_packet->orig,
1034 hard_iface->net_dev->dev_addr))
1035 is_my_orig = 1;
1036
1037 if (batadv_compare_eth(batadv_ogm_packet->prev_sender,
1038 hard_iface->net_dev->dev_addr))
1039 is_my_oldorig = 1;
1040
1041 if (is_broadcast_ether_addr(ethhdr->h_source))
1042 is_broadcast = 1;
1043 }
1044 rcu_read_unlock();
1045
1046 if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) {
1047 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1048 "Drop packet: incompatible batman version (%i)\n",
1049 batadv_ogm_packet->header.version);
1050 return;
1051 }
1052
1053 if (is_my_addr) {
1054 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1055 "Drop packet: received my own broadcast (sender: %pM)\n",
1056 ethhdr->h_source);
1057 return;
1058 }
1059
1060 if (is_broadcast) {
1061 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1062 "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n",
1063 ethhdr->h_source);
1064 return;
1065 }
1066
1067 if (is_my_orig) {
1068 unsigned long *word;
1069 int offset;
1070 int32_t bit_pos;
1071 int16_t if_num;
1072 uint8_t *weight;
1073
1074 orig_neigh_node = batadv_get_orig_node(bat_priv,
1075 ethhdr->h_source);
1076 if (!orig_neigh_node)
1077 return;
1078
1079 /* neighbor has to indicate direct link and it has to
1080 * come via the corresponding interface
1081 * save packet seqno for bidirectional check
1082 */
1083 if (has_directlink_flag &&
1084 batadv_compare_eth(if_incoming->net_dev->dev_addr,
1085 batadv_ogm_packet->orig)) {
1086 if_num = if_incoming->if_num;
1087 offset = if_num * BATADV_NUM_WORDS;
1088
1089 spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
1090 word = &(orig_neigh_node->bcast_own[offset]);
1091 bit_pos = if_incoming_seqno - 2;
1092 bit_pos -= ntohl(batadv_ogm_packet->seqno);
1093 batadv_set_bit(word, bit_pos);
1094 weight = &orig_neigh_node->bcast_own_sum[if_num];
1095 *weight = bitmap_weight(word,
1096 BATADV_TQ_LOCAL_WINDOW_SIZE);
1097 spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
1098 }
1099
1100 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1101 "Drop packet: originator packet from myself (via neighbor)\n");
1102 batadv_orig_node_free_ref(orig_neigh_node);
1103 return;
1104 }
1105
1106 if (is_my_oldorig) {
1107 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1108 "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1109 ethhdr->h_source);
1110 return;
1111 }
1112
1113 if (batadv_ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
1114 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1115 "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1116 ethhdr->h_source);
1117 return;
1118 }
1119
1120 orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig);
1121 if (!orig_node)
1122 return;
1123
1124 is_duplicate = batadv_iv_ogm_update_seqnos(ethhdr, batadv_ogm_packet,
1125 if_incoming);
1126
1127 if (is_duplicate == -1) {
1128 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1129 "Drop packet: packet within seqno protection time (sender: %pM)\n",
1130 ethhdr->h_source);
1131 goto out;
1132 }
1133
1134 if (batadv_ogm_packet->tq == 0) {
1135 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1136 "Drop packet: originator packet with tq equal 0\n");
1137 goto out;
1138 }
1139
1140 router = batadv_orig_node_get_router(orig_node);
1141 if (router)
1142 router_router = batadv_orig_node_get_router(router->orig_node);
1143
1144 if ((router && router->tq_avg != 0) &&
1145 (batadv_compare_eth(router->addr, ethhdr->h_source)))
1146 is_from_best_next_hop = true;
1147
1148 prev_sender = batadv_ogm_packet->prev_sender;
1149 /* avoid temporary routing loops */
1150 if (router && router_router &&
1151 (batadv_compare_eth(router->addr, prev_sender)) &&
1152 !(batadv_compare_eth(batadv_ogm_packet->orig, prev_sender)) &&
1153 (batadv_compare_eth(router->addr, router_router->addr))) {
1154 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1155 "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1156 ethhdr->h_source);
1157 goto out;
1158 }
1159
1160 /* if sender is a direct neighbor the sender mac equals
1161 * originator mac
1162 */
1163 orig_neigh_node = (is_single_hop_neigh ?
1164 orig_node :
1165 batadv_get_orig_node(bat_priv, ethhdr->h_source));
1166 if (!orig_neigh_node)
1167 goto out;
1168
1169 orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node);
1170
1171 /* drop packet if sender is not a direct neighbor and if we
1172 * don't route towards it
1173 */
1174 if (!is_single_hop_neigh && (!orig_neigh_router)) {
1175 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1176 "Drop packet: OGM via unknown neighbor!\n");
1177 goto out_neigh;
1178 }
1179
1180 is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1181 batadv_ogm_packet, if_incoming);
1182
1183 batadv_bonding_save_primary(orig_node, orig_neigh_node,
1184 batadv_ogm_packet);
1185
1186 /* update ranking if it is not a duplicate or has the same
1187 * seqno and similar ttl as the non-duplicate
1188 */
1189 sameseq = orig_node->last_real_seqno == ntohl(batadv_ogm_packet->seqno);
1190 simlar_ttl = orig_node->last_ttl - 3 <= batadv_ogm_packet->header.ttl;
1191 if (is_bidirect && (!is_duplicate || (sameseq && simlar_ttl)))
1192 batadv_iv_ogm_orig_update(bat_priv, orig_node, ethhdr,
1193 batadv_ogm_packet, if_incoming,
1194 tt_buff, is_duplicate);
1195
1196 /* is single hop (direct) neighbor */
1197 if (is_single_hop_neigh) {
1198
1199 /* mark direct link on incoming interface */
1200 batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
1201 is_single_hop_neigh,
1202 is_from_best_next_hop, if_incoming);
1203
1204 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1205 "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1206 goto out_neigh;
1207 }
1208
1209 /* multihop originator */
1210 if (!is_bidirect) {
1211 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1212 "Drop packet: not received via bidirectional link\n");
1213 goto out_neigh;
1214 }
1215
1216 if (is_duplicate) {
1217 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1218 "Drop packet: duplicate packet received\n");
1219 goto out_neigh;
1220 }
1221
1222 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1223 "Forwarding packet: rebroadcast originator packet\n");
1224 batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
1225 is_single_hop_neigh, is_from_best_next_hop,
1226 if_incoming);
1227
1228 out_neigh:
1229 if ((orig_neigh_node) && (!is_single_hop_neigh))
1230 batadv_orig_node_free_ref(orig_neigh_node);
1231 out:
1232 if (router)
1233 batadv_neigh_node_free_ref(router);
1234 if (router_router)
1235 batadv_neigh_node_free_ref(router_router);
1236 if (orig_neigh_router)
1237 batadv_neigh_node_free_ref(orig_neigh_router);
1238
1239 batadv_orig_node_free_ref(orig_node);
1240 }
1241
1242 static int batadv_iv_ogm_receive(struct sk_buff *skb,
1243 struct hard_iface *if_incoming)
1244 {
1245 struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1246 struct batadv_ogm_packet *batadv_ogm_packet;
1247 struct ethhdr *ethhdr;
1248 int buff_pos = 0, packet_len;
1249 unsigned char *tt_buff, *packet_buff;
1250 bool ret;
1251
1252 ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
1253 if (!ret)
1254 return NET_RX_DROP;
1255
1256 /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1257 * that does not have B.A.T.M.A.N. IV enabled ?
1258 */
1259 if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
1260 return NET_RX_DROP;
1261
1262 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1263 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
1264 skb->len + ETH_HLEN);
1265
1266 packet_len = skb_headlen(skb);
1267 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1268 packet_buff = skb->data;
1269 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
1270
1271 /* unpack the aggregated packets and process them one by one */
1272 do {
1273 tt_buff = packet_buff + buff_pos + BATADV_OGM_HLEN;
1274
1275 batadv_iv_ogm_process(ethhdr, batadv_ogm_packet, tt_buff,
1276 if_incoming);
1277
1278 buff_pos += BATADV_OGM_HLEN;
1279 buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes);
1280
1281 batadv_ogm_packet = (struct batadv_ogm_packet *)
1282 (packet_buff + buff_pos);
1283 } while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len,
1284 batadv_ogm_packet->tt_num_changes));
1285
1286 kfree_skb(skb);
1287 return NET_RX_SUCCESS;
1288 }
1289
1290 static struct bat_algo_ops batadv_batman_iv __read_mostly = {
1291 .name = "BATMAN_IV",
1292 .bat_iface_enable = batadv_iv_ogm_iface_enable,
1293 .bat_iface_disable = batadv_iv_ogm_iface_disable,
1294 .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
1295 .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
1296 .bat_ogm_schedule = batadv_iv_ogm_schedule,
1297 .bat_ogm_emit = batadv_iv_ogm_emit,
1298 };
1299
1300 int __init batadv_iv_init(void)
1301 {
1302 int ret;
1303
1304 /* batman originator packet */
1305 ret = batadv_recv_handler_register(BATADV_IV_OGM,
1306 batadv_iv_ogm_receive);
1307 if (ret < 0)
1308 goto out;
1309
1310 ret = batadv_algo_register(&batadv_batman_iv);
1311 if (ret < 0)
1312 goto handler_unregister;
1313
1314 goto out;
1315
1316 handler_unregister:
1317 batadv_recv_handler_unregister(BATADV_IV_OGM);
1318 out:
1319 return ret;
1320 }
Linux kernel - Deliverables
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