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[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 batadv_neigh_node *
32 batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface,
33 const uint8_t *neigh_addr,
34 struct batadv_orig_node *orig_node,
35 struct batadv_orig_node *orig_neigh, __be32 seqno)
36 {
37 struct batadv_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 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 += random32() % (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(random32() % (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
187 /* we might have aggregated direct link packets with an
188 * ordinary base packet
189 */
190 if (forw_packet->direct_link_flags & BIT(packet_num) &&
191 forw_packet->if_incoming == hard_iface)
192 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
193 else
194 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
195
196 if (packet_num > 0 || !forw_packet->own)
197 fwd_str = "Forwarding";
198 else
199 fwd_str = "Sending own";
200
201 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
202 "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n",
203 fwd_str, (packet_num > 0 ? "aggregated " : ""),
204 batadv_ogm_packet->orig,
205 ntohl(batadv_ogm_packet->seqno),
206 batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl,
207 (batadv_ogm_packet->flags & BATADV_DIRECTLINK ?
208 "on" : "off"),
209 batadv_ogm_packet->ttvn, hard_iface->net_dev->name,
210 hard_iface->net_dev->dev_addr);
211
212 buff_pos += BATADV_OGM_HLEN;
213 buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes);
214 packet_num++;
215 packet_pos = forw_packet->skb->data + buff_pos;
216 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
217 }
218
219 /* create clone because function is called more than once */
220 skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
221 if (skb) {
222 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
223 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
224 skb->len + ETH_HLEN);
225 batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr);
226 }
227 }
228
229 /* send a batman ogm packet */
230 static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
231 {
232 struct batadv_hard_iface *hard_iface;
233 struct net_device *soft_iface;
234 struct batadv_priv *bat_priv;
235 struct batadv_hard_iface *primary_if = NULL;
236 struct batadv_ogm_packet *batadv_ogm_packet;
237 unsigned char directlink;
238 uint8_t *packet_pos;
239
240 packet_pos = forw_packet->skb->data;
241 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
242 directlink = (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0);
243
244 if (!forw_packet->if_incoming) {
245 pr_err("Error - can't forward packet: incoming iface not specified\n");
246 goto out;
247 }
248
249 soft_iface = forw_packet->if_incoming->soft_iface;
250 bat_priv = netdev_priv(soft_iface);
251
252 if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
253 goto out;
254
255 primary_if = batadv_primary_if_get_selected(bat_priv);
256 if (!primary_if)
257 goto out;
258
259 /* multihomed peer assumed
260 * non-primary OGMs are only broadcasted on their interface
261 */
262 if ((directlink && (batadv_ogm_packet->header.ttl == 1)) ||
263 (forw_packet->own && (forw_packet->if_incoming != primary_if))) {
264
265 /* FIXME: what about aggregated packets ? */
266 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
267 "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n",
268 (forw_packet->own ? "Sending own" : "Forwarding"),
269 batadv_ogm_packet->orig,
270 ntohl(batadv_ogm_packet->seqno),
271 batadv_ogm_packet->header.ttl,
272 forw_packet->if_incoming->net_dev->name,
273 forw_packet->if_incoming->net_dev->dev_addr);
274
275 /* skb is only used once and than forw_packet is free'd */
276 batadv_send_skb_packet(forw_packet->skb,
277 forw_packet->if_incoming,
278 batadv_broadcast_addr);
279 forw_packet->skb = NULL;
280
281 goto out;
282 }
283
284 /* broadcast on every interface */
285 rcu_read_lock();
286 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
287 if (hard_iface->soft_iface != soft_iface)
288 continue;
289
290 batadv_iv_ogm_send_to_if(forw_packet, hard_iface);
291 }
292 rcu_read_unlock();
293
294 out:
295 if (primary_if)
296 batadv_hardif_free_ref(primary_if);
297 }
298
299 /* return true if new_packet can be aggregated with forw_packet */
300 static bool
301 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
302 struct batadv_priv *bat_priv,
303 int packet_len, unsigned long send_time,
304 bool directlink,
305 const struct batadv_hard_iface *if_incoming,
306 const struct batadv_forw_packet *forw_packet)
307 {
308 struct batadv_ogm_packet *batadv_ogm_packet;
309 int aggregated_bytes = forw_packet->packet_len + packet_len;
310 struct batadv_hard_iface *primary_if = NULL;
311 bool res = false;
312 unsigned long aggregation_end_time;
313
314 batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
315 aggregation_end_time = send_time;
316 aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
317
318 /* we can aggregate the current packet to this aggregated packet
319 * if:
320 *
321 * - the send time is within our MAX_AGGREGATION_MS time
322 * - the resulting packet wont be bigger than
323 * MAX_AGGREGATION_BYTES
324 */
325 if (time_before(send_time, forw_packet->send_time) &&
326 time_after_eq(aggregation_end_time, forw_packet->send_time) &&
327 (aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) {
328
329 /* check aggregation compatibility
330 * -> direct link packets are broadcasted on
331 * their interface only
332 * -> aggregate packet if the current packet is
333 * a "global" packet as well as the base
334 * packet
335 */
336 primary_if = batadv_primary_if_get_selected(bat_priv);
337 if (!primary_if)
338 goto out;
339
340 /* packets without direct link flag and high TTL
341 * are flooded through the net
342 */
343 if ((!directlink) &&
344 (!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) &&
345 (batadv_ogm_packet->header.ttl != 1) &&
346
347 /* own packets originating non-primary
348 * interfaces leave only that interface
349 */
350 ((!forw_packet->own) ||
351 (forw_packet->if_incoming == primary_if))) {
352 res = true;
353 goto out;
354 }
355
356 /* if the incoming packet is sent via this one
357 * interface only - we still can aggregate
358 */
359 if ((directlink) &&
360 (new_bat_ogm_packet->header.ttl == 1) &&
361 (forw_packet->if_incoming == if_incoming) &&
362
363 /* packets from direct neighbors or
364 * own secondary interface packets
365 * (= secondary interface packets in general)
366 */
367 (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
368 (forw_packet->own &&
369 forw_packet->if_incoming != primary_if))) {
370 res = true;
371 goto out;
372 }
373 }
374
375 out:
376 if (primary_if)
377 batadv_hardif_free_ref(primary_if);
378 return res;
379 }
380
381 /* create a new aggregated packet and add this packet to it */
382 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
383 int packet_len, unsigned long send_time,
384 bool direct_link,
385 struct batadv_hard_iface *if_incoming,
386 int own_packet)
387 {
388 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
389 struct batadv_forw_packet *forw_packet_aggr;
390 unsigned char *skb_buff;
391 unsigned int skb_size;
392
393 if (!atomic_inc_not_zero(&if_incoming->refcount))
394 return;
395
396 /* own packet should always be scheduled */
397 if (!own_packet) {
398 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
399 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
400 "batman packet queue full\n");
401 goto out;
402 }
403 }
404
405 forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
406 if (!forw_packet_aggr) {
407 if (!own_packet)
408 atomic_inc(&bat_priv->batman_queue_left);
409 goto out;
410 }
411
412 if ((atomic_read(&bat_priv->aggregated_ogms)) &&
413 (packet_len < BATADV_MAX_AGGREGATION_BYTES))
414 skb_size = BATADV_MAX_AGGREGATION_BYTES;
415 else
416 skb_size = packet_len;
417
418 skb_size += ETH_HLEN + NET_IP_ALIGN;
419
420 forw_packet_aggr->skb = dev_alloc_skb(skb_size);
421 if (!forw_packet_aggr->skb) {
422 if (!own_packet)
423 atomic_inc(&bat_priv->batman_queue_left);
424 kfree(forw_packet_aggr);
425 goto out;
426 }
427 skb_reserve(forw_packet_aggr->skb, ETH_HLEN + NET_IP_ALIGN);
428
429 INIT_HLIST_NODE(&forw_packet_aggr->list);
430
431 skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
432 forw_packet_aggr->packet_len = packet_len;
433 memcpy(skb_buff, packet_buff, packet_len);
434
435 forw_packet_aggr->own = own_packet;
436 forw_packet_aggr->if_incoming = if_incoming;
437 forw_packet_aggr->num_packets = 0;
438 forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
439 forw_packet_aggr->send_time = send_time;
440
441 /* save packet direct link flag status */
442 if (direct_link)
443 forw_packet_aggr->direct_link_flags |= 1;
444
445 /* add new packet to packet list */
446 spin_lock_bh(&bat_priv->forw_bat_list_lock);
447 hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
448 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
449
450 /* start timer for this packet */
451 INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
452 batadv_send_outstanding_bat_ogm_packet);
453 queue_delayed_work(batadv_event_workqueue,
454 &forw_packet_aggr->delayed_work,
455 send_time - jiffies);
456
457 return;
458 out:
459 batadv_hardif_free_ref(if_incoming);
460 }
461
462 /* aggregate a new packet into the existing ogm packet */
463 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
464 const unsigned char *packet_buff,
465 int packet_len, bool direct_link)
466 {
467 unsigned char *skb_buff;
468 unsigned long new_direct_link_flag;
469
470 skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
471 memcpy(skb_buff, packet_buff, packet_len);
472 forw_packet_aggr->packet_len += packet_len;
473 forw_packet_aggr->num_packets++;
474
475 /* save packet direct link flag status */
476 if (direct_link) {
477 new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
478 forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
479 }
480 }
481
482 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
483 unsigned char *packet_buff,
484 int packet_len,
485 struct batadv_hard_iface *if_incoming,
486 int own_packet, unsigned long send_time)
487 {
488 /* _aggr -> pointer to the packet we want to aggregate with
489 * _pos -> pointer to the position in the queue
490 */
491 struct batadv_forw_packet *forw_packet_aggr = NULL;
492 struct batadv_forw_packet *forw_packet_pos = NULL;
493 struct hlist_node *tmp_node;
494 struct batadv_ogm_packet *batadv_ogm_packet;
495 bool direct_link;
496 unsigned long max_aggregation_jiffies;
497
498 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
499 direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0;
500 max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
501
502 /* find position for the packet in the forward queue */
503 spin_lock_bh(&bat_priv->forw_bat_list_lock);
504 /* own packets are not to be aggregated */
505 if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
506 hlist_for_each_entry(forw_packet_pos, tmp_node,
507 &bat_priv->forw_bat_list, list) {
508 if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
509 bat_priv, packet_len,
510 send_time, direct_link,
511 if_incoming,
512 forw_packet_pos)) {
513 forw_packet_aggr = forw_packet_pos;
514 break;
515 }
516 }
517 }
518
519 /* nothing to aggregate with - either aggregation disabled or no
520 * suitable aggregation packet found
521 */
522 if (!forw_packet_aggr) {
523 /* the following section can run without the lock */
524 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
525
526 /* if we could not aggregate this packet with one of the others
527 * we hold it back for a while, so that it might be aggregated
528 * later on
529 */
530 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
531 send_time += max_aggregation_jiffies;
532
533 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
534 send_time, direct_link,
535 if_incoming, own_packet);
536 } else {
537 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
538 packet_len, direct_link);
539 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
540 }
541 }
542
543 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
544 const struct ethhdr *ethhdr,
545 struct batadv_ogm_packet *batadv_ogm_packet,
546 bool is_single_hop_neigh,
547 bool is_from_best_next_hop,
548 struct batadv_hard_iface *if_incoming)
549 {
550 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
551 uint8_t tt_num_changes;
552
553 if (batadv_ogm_packet->header.ttl <= 1) {
554 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
555 return;
556 }
557
558 if (!is_from_best_next_hop) {
559 /* Mark the forwarded packet when it is not coming from our
560 * best next hop. We still need to forward the packet for our
561 * neighbor link quality detection to work in case the packet
562 * originated from a single hop neighbor. Otherwise we can
563 * simply drop the ogm.
564 */
565 if (is_single_hop_neigh)
566 batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
567 else
568 return;
569 }
570
571 tt_num_changes = batadv_ogm_packet->tt_num_changes;
572
573 batadv_ogm_packet->header.ttl--;
574 memcpy(batadv_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
575
576 /* apply hop penalty */
577 batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
578 bat_priv);
579
580 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
581 "Forwarding packet: tq: %i, ttl: %i\n",
582 batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl);
583
584 /* switch of primaries first hop flag when forwarding */
585 batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP;
586 if (is_single_hop_neigh)
587 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
588 else
589 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
590
591 batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
592 BATADV_OGM_HLEN + batadv_tt_len(tt_num_changes),
593 if_incoming, 0, batadv_iv_ogm_fwd_send_time());
594 }
595
596 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
597 {
598 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
599 unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
600 struct batadv_ogm_packet *batadv_ogm_packet;
601 struct batadv_hard_iface *primary_if;
602 int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
603 int vis_server, tt_num_changes = 0;
604 uint32_t seqno;
605 uint8_t bandwidth;
606
607 vis_server = atomic_read(&bat_priv->vis_mode);
608 primary_if = batadv_primary_if_get_selected(bat_priv);
609
610 if (hard_iface == primary_if)
611 tt_num_changes = batadv_tt_append_diff(bat_priv, ogm_buff,
612 ogm_buff_len,
613 BATADV_OGM_HLEN);
614
615 batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
616
617 /* change sequence number to network order */
618 seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno);
619 batadv_ogm_packet->seqno = htonl(seqno);
620 atomic_inc(&hard_iface->bat_iv.ogm_seqno);
621
622 batadv_ogm_packet->ttvn = atomic_read(&bat_priv->tt.vn);
623 batadv_ogm_packet->tt_crc = htons(bat_priv->tt.local_crc);
624 if (tt_num_changes >= 0)
625 batadv_ogm_packet->tt_num_changes = tt_num_changes;
626
627 if (vis_server == BATADV_VIS_TYPE_SERVER_SYNC)
628 batadv_ogm_packet->flags |= BATADV_VIS_SERVER;
629 else
630 batadv_ogm_packet->flags &= ~BATADV_VIS_SERVER;
631
632 if (hard_iface == primary_if &&
633 atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_SERVER) {
634 bandwidth = (uint8_t)atomic_read(&bat_priv->gw_bandwidth);
635 batadv_ogm_packet->gw_flags = bandwidth;
636 } else {
637 batadv_ogm_packet->gw_flags = BATADV_NO_FLAGS;
638 }
639
640 batadv_slide_own_bcast_window(hard_iface);
641 batadv_iv_ogm_queue_add(bat_priv, hard_iface->bat_iv.ogm_buff,
642 hard_iface->bat_iv.ogm_buff_len, hard_iface, 1,
643 batadv_iv_ogm_emit_send_time(bat_priv));
644
645 if (primary_if)
646 batadv_hardif_free_ref(primary_if);
647 }
648
649 static void
650 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
651 struct batadv_orig_node *orig_node,
652 const struct ethhdr *ethhdr,
653 const struct batadv_ogm_packet *batadv_ogm_packet,
654 struct batadv_hard_iface *if_incoming,
655 const unsigned char *tt_buff,
656 int is_duplicate)
657 {
658 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
659 struct batadv_neigh_node *router = NULL;
660 struct batadv_orig_node *orig_node_tmp;
661 struct hlist_node *node;
662 int if_num;
663 uint8_t sum_orig, sum_neigh;
664 uint8_t *neigh_addr;
665 uint8_t tq_avg;
666
667 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
668 "update_originator(): Searching and updating originator entry of received packet\n");
669
670 rcu_read_lock();
671 hlist_for_each_entry_rcu(tmp_neigh_node, node,
672 &orig_node->neigh_list, list) {
673 neigh_addr = tmp_neigh_node->addr;
674 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
675 tmp_neigh_node->if_incoming == if_incoming &&
676 atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
677 if (neigh_node)
678 batadv_neigh_node_free_ref(neigh_node);
679 neigh_node = tmp_neigh_node;
680 continue;
681 }
682
683 if (is_duplicate)
684 continue;
685
686 spin_lock_bh(&tmp_neigh_node->lq_update_lock);
687 batadv_ring_buffer_set(tmp_neigh_node->tq_recv,
688 &tmp_neigh_node->tq_index, 0);
689 tq_avg = batadv_ring_buffer_avg(tmp_neigh_node->tq_recv);
690 tmp_neigh_node->tq_avg = tq_avg;
691 spin_unlock_bh(&tmp_neigh_node->lq_update_lock);
692 }
693
694 if (!neigh_node) {
695 struct batadv_orig_node *orig_tmp;
696
697 orig_tmp = batadv_get_orig_node(bat_priv, ethhdr->h_source);
698 if (!orig_tmp)
699 goto unlock;
700
701 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
702 ethhdr->h_source,
703 orig_node, orig_tmp,
704 batadv_ogm_packet->seqno);
705
706 batadv_orig_node_free_ref(orig_tmp);
707 if (!neigh_node)
708 goto unlock;
709 } else
710 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
711 "Updating existing last-hop neighbor of originator\n");
712
713 rcu_read_unlock();
714
715 orig_node->flags = batadv_ogm_packet->flags;
716 neigh_node->last_seen = jiffies;
717
718 spin_lock_bh(&neigh_node->lq_update_lock);
719 batadv_ring_buffer_set(neigh_node->tq_recv,
720 &neigh_node->tq_index,
721 batadv_ogm_packet->tq);
722 neigh_node->tq_avg = batadv_ring_buffer_avg(neigh_node->tq_recv);
723 spin_unlock_bh(&neigh_node->lq_update_lock);
724
725 if (!is_duplicate) {
726 orig_node->last_ttl = batadv_ogm_packet->header.ttl;
727 neigh_node->last_ttl = batadv_ogm_packet->header.ttl;
728 }
729
730 batadv_bonding_candidate_add(orig_node, neigh_node);
731
732 /* if this neighbor already is our next hop there is nothing
733 * to change
734 */
735 router = batadv_orig_node_get_router(orig_node);
736 if (router == neigh_node)
737 goto update_tt;
738
739 /* if this neighbor does not offer a better TQ we won't consider it */
740 if (router && (router->tq_avg > neigh_node->tq_avg))
741 goto update_tt;
742
743 /* if the TQ is the same and the link not more symmetric we
744 * won't consider it either
745 */
746 if (router && (neigh_node->tq_avg == router->tq_avg)) {
747 orig_node_tmp = router->orig_node;
748 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
749 if_num = router->if_incoming->if_num;
750 sum_orig = orig_node_tmp->bcast_own_sum[if_num];
751 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
752
753 orig_node_tmp = neigh_node->orig_node;
754 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
755 if_num = neigh_node->if_incoming->if_num;
756 sum_neigh = orig_node_tmp->bcast_own_sum[if_num];
757 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
758
759 if (sum_orig >= sum_neigh)
760 goto update_tt;
761 }
762
763 batadv_update_route(bat_priv, orig_node, neigh_node);
764
765 update_tt:
766 /* I have to check for transtable changes only if the OGM has been
767 * sent through a primary interface
768 */
769 if (((batadv_ogm_packet->orig != ethhdr->h_source) &&
770 (batadv_ogm_packet->header.ttl > 2)) ||
771 (batadv_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP))
772 batadv_tt_update_orig(bat_priv, orig_node, tt_buff,
773 batadv_ogm_packet->tt_num_changes,
774 batadv_ogm_packet->ttvn,
775 ntohs(batadv_ogm_packet->tt_crc));
776
777 if (orig_node->gw_flags != batadv_ogm_packet->gw_flags)
778 batadv_gw_node_update(bat_priv, orig_node,
779 batadv_ogm_packet->gw_flags);
780
781 orig_node->gw_flags = batadv_ogm_packet->gw_flags;
782
783 /* restart gateway selection if fast or late switching was enabled */
784 if ((orig_node->gw_flags) &&
785 (atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_CLIENT) &&
786 (atomic_read(&bat_priv->gw_sel_class) > 2))
787 batadv_gw_check_election(bat_priv, orig_node);
788
789 goto out;
790
791 unlock:
792 rcu_read_unlock();
793 out:
794 if (neigh_node)
795 batadv_neigh_node_free_ref(neigh_node);
796 if (router)
797 batadv_neigh_node_free_ref(router);
798 }
799
800 static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
801 struct batadv_orig_node *orig_neigh_node,
802 struct batadv_ogm_packet *batadv_ogm_packet,
803 struct batadv_hard_iface *if_incoming)
804 {
805 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
806 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
807 struct hlist_node *node;
808 uint8_t total_count;
809 uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
810 unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
811 int tq_asym_penalty, inv_asym_penalty, ret = 0;
812 unsigned int combined_tq;
813
814 /* find corresponding one hop neighbor */
815 rcu_read_lock();
816 hlist_for_each_entry_rcu(tmp_neigh_node, node,
817 &orig_neigh_node->neigh_list, list) {
818
819 if (!batadv_compare_eth(tmp_neigh_node->addr,
820 orig_neigh_node->orig))
821 continue;
822
823 if (tmp_neigh_node->if_incoming != if_incoming)
824 continue;
825
826 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
827 continue;
828
829 neigh_node = tmp_neigh_node;
830 break;
831 }
832 rcu_read_unlock();
833
834 if (!neigh_node)
835 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
836 orig_neigh_node->orig,
837 orig_neigh_node,
838 orig_neigh_node,
839 batadv_ogm_packet->seqno);
840
841 if (!neigh_node)
842 goto out;
843
844 /* if orig_node is direct neighbor update neigh_node last_seen */
845 if (orig_node == orig_neigh_node)
846 neigh_node->last_seen = jiffies;
847
848 orig_node->last_seen = jiffies;
849
850 /* find packet count of corresponding one hop neighbor */
851 spin_lock_bh(&orig_node->ogm_cnt_lock);
852 orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];
853 neigh_rq_count = neigh_node->real_packet_count;
854 spin_unlock_bh(&orig_node->ogm_cnt_lock);
855
856 /* pay attention to not get a value bigger than 100 % */
857 if (orig_eq_count > neigh_rq_count)
858 total_count = neigh_rq_count;
859 else
860 total_count = orig_eq_count;
861
862 /* if we have too few packets (too less data) we set tq_own to zero
863 * if we receive too few packets it is not considered bidirectional
864 */
865 if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
866 neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
867 tq_own = 0;
868 else
869 /* neigh_node->real_packet_count is never zero as we
870 * only purge old information when getting new
871 * information
872 */
873 tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count;
874
875 /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
876 * affect the nearly-symmetric links only a little, but
877 * punishes asymmetric links more. This will give a value
878 * between 0 and TQ_MAX_VALUE
879 */
880 neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
881 neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
882 neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
883 BATADV_TQ_LOCAL_WINDOW_SIZE *
884 BATADV_TQ_LOCAL_WINDOW_SIZE;
885 inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
886 inv_asym_penalty /= neigh_rq_max_cube;
887 tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
888
889 combined_tq = batadv_ogm_packet->tq * tq_own * tq_asym_penalty;
890 combined_tq /= BATADV_TQ_MAX_VALUE * BATADV_TQ_MAX_VALUE;
891 batadv_ogm_packet->tq = combined_tq;
892
893 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
894 "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n",
895 orig_node->orig, orig_neigh_node->orig, total_count,
896 neigh_rq_count, tq_own,
897 tq_asym_penalty, batadv_ogm_packet->tq);
898
899 /* if link has the minimum required transmission quality
900 * consider it bidirectional
901 */
902 if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
903 ret = 1;
904
905 out:
906 if (neigh_node)
907 batadv_neigh_node_free_ref(neigh_node);
908 return ret;
909 }
910
911 /* processes a batman packet for all interfaces, adjusts the sequence number and
912 * finds out whether it is a duplicate.
913 * returns:
914 * 1 the packet is a duplicate
915 * 0 the packet has not yet been received
916 * -1 the packet is old and has been received while the seqno window
917 * was protected. Caller should drop it.
918 */
919 static int
920 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
921 const struct batadv_ogm_packet *batadv_ogm_packet,
922 const struct batadv_hard_iface *if_incoming)
923 {
924 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
925 struct batadv_orig_node *orig_node;
926 struct batadv_neigh_node *tmp_neigh_node;
927 struct hlist_node *node;
928 int is_duplicate = 0;
929 int32_t seq_diff;
930 int need_update = 0;
931 int set_mark, ret = -1;
932 uint32_t seqno = ntohl(batadv_ogm_packet->seqno);
933 uint8_t *neigh_addr;
934 uint8_t packet_count;
935
936 orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig);
937 if (!orig_node)
938 return 0;
939
940 spin_lock_bh(&orig_node->ogm_cnt_lock);
941 seq_diff = seqno - orig_node->last_real_seqno;
942
943 /* signalize caller that the packet is to be dropped. */
944 if (!hlist_empty(&orig_node->neigh_list) &&
945 batadv_window_protected(bat_priv, seq_diff,
946 &orig_node->batman_seqno_reset))
947 goto out;
948
949 rcu_read_lock();
950 hlist_for_each_entry_rcu(tmp_neigh_node, node,
951 &orig_node->neigh_list, list) {
952
953 is_duplicate |= batadv_test_bit(tmp_neigh_node->real_bits,
954 orig_node->last_real_seqno,
955 seqno);
956
957 neigh_addr = tmp_neigh_node->addr;
958 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
959 tmp_neigh_node->if_incoming == if_incoming)
960 set_mark = 1;
961 else
962 set_mark = 0;
963
964 /* if the window moved, set the update flag. */
965 need_update |= batadv_bit_get_packet(bat_priv,
966 tmp_neigh_node->real_bits,
967 seq_diff, set_mark);
968
969 packet_count = bitmap_weight(tmp_neigh_node->real_bits,
970 BATADV_TQ_LOCAL_WINDOW_SIZE);
971 tmp_neigh_node->real_packet_count = packet_count;
972 }
973 rcu_read_unlock();
974
975 if (need_update) {
976 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
977 "updating last_seqno: old %u, new %u\n",
978 orig_node->last_real_seqno, seqno);
979 orig_node->last_real_seqno = seqno;
980 }
981
982 ret = is_duplicate;
983
984 out:
985 spin_unlock_bh(&orig_node->ogm_cnt_lock);
986 batadv_orig_node_free_ref(orig_node);
987 return ret;
988 }
989
990 static void batadv_iv_ogm_process(const struct ethhdr *ethhdr,
991 struct batadv_ogm_packet *batadv_ogm_packet,
992 const unsigned char *tt_buff,
993 struct batadv_hard_iface *if_incoming)
994 {
995 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
996 struct batadv_hard_iface *hard_iface;
997 struct batadv_orig_node *orig_neigh_node, *orig_node;
998 struct batadv_neigh_node *router = NULL, *router_router = NULL;
999 struct batadv_neigh_node *orig_neigh_router = NULL;
1000 int has_directlink_flag;
1001 int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
1002 int is_broadcast = 0, is_bidirect;
1003 bool is_single_hop_neigh = false;
1004 bool is_from_best_next_hop = false;
1005 int is_duplicate, sameseq, simlar_ttl;
1006 uint32_t if_incoming_seqno;
1007 uint8_t *prev_sender;
1008
1009 /* Silently drop when the batman packet is actually not a
1010 * correct packet.
1011 *
1012 * This might happen if a packet is padded (e.g. Ethernet has a
1013 * minimum frame length of 64 byte) and the aggregation interprets
1014 * it as an additional length.
1015 *
1016 * TODO: A more sane solution would be to have a bit in the
1017 * batadv_ogm_packet to detect whether the packet is the last
1018 * packet in an aggregation. Here we expect that the padding
1019 * is always zero (or not 0x01)
1020 */
1021 if (batadv_ogm_packet->header.packet_type != BATADV_IV_OGM)
1022 return;
1023
1024 /* could be changed by schedule_own_packet() */
1025 if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
1026
1027 if (batadv_ogm_packet->flags & BATADV_DIRECTLINK)
1028 has_directlink_flag = 1;
1029 else
1030 has_directlink_flag = 0;
1031
1032 if (batadv_compare_eth(ethhdr->h_source, batadv_ogm_packet->orig))
1033 is_single_hop_neigh = true;
1034
1035 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1036 "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",
1037 ethhdr->h_source, if_incoming->net_dev->name,
1038 if_incoming->net_dev->dev_addr, batadv_ogm_packet->orig,
1039 batadv_ogm_packet->prev_sender,
1040 ntohl(batadv_ogm_packet->seqno), batadv_ogm_packet->ttvn,
1041 ntohs(batadv_ogm_packet->tt_crc),
1042 batadv_ogm_packet->tt_num_changes, batadv_ogm_packet->tq,
1043 batadv_ogm_packet->header.ttl,
1044 batadv_ogm_packet->header.version, has_directlink_flag);
1045
1046 rcu_read_lock();
1047 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1048 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1049 continue;
1050
1051 if (hard_iface->soft_iface != if_incoming->soft_iface)
1052 continue;
1053
1054 if (batadv_compare_eth(ethhdr->h_source,
1055 hard_iface->net_dev->dev_addr))
1056 is_my_addr = 1;
1057
1058 if (batadv_compare_eth(batadv_ogm_packet->orig,
1059 hard_iface->net_dev->dev_addr))
1060 is_my_orig = 1;
1061
1062 if (batadv_compare_eth(batadv_ogm_packet->prev_sender,
1063 hard_iface->net_dev->dev_addr))
1064 is_my_oldorig = 1;
1065
1066 if (is_broadcast_ether_addr(ethhdr->h_source))
1067 is_broadcast = 1;
1068 }
1069 rcu_read_unlock();
1070
1071 if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) {
1072 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1073 "Drop packet: incompatible batman version (%i)\n",
1074 batadv_ogm_packet->header.version);
1075 return;
1076 }
1077
1078 if (is_my_addr) {
1079 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1080 "Drop packet: received my own broadcast (sender: %pM)\n",
1081 ethhdr->h_source);
1082 return;
1083 }
1084
1085 if (is_broadcast) {
1086 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1087 "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n",
1088 ethhdr->h_source);
1089 return;
1090 }
1091
1092 if (is_my_orig) {
1093 unsigned long *word;
1094 int offset;
1095 int32_t bit_pos;
1096 int16_t if_num;
1097 uint8_t *weight;
1098
1099 orig_neigh_node = batadv_get_orig_node(bat_priv,
1100 ethhdr->h_source);
1101 if (!orig_neigh_node)
1102 return;
1103
1104 /* neighbor has to indicate direct link and it has to
1105 * come via the corresponding interface
1106 * save packet seqno for bidirectional check
1107 */
1108 if (has_directlink_flag &&
1109 batadv_compare_eth(if_incoming->net_dev->dev_addr,
1110 batadv_ogm_packet->orig)) {
1111 if_num = if_incoming->if_num;
1112 offset = if_num * BATADV_NUM_WORDS;
1113
1114 spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
1115 word = &(orig_neigh_node->bcast_own[offset]);
1116 bit_pos = if_incoming_seqno - 2;
1117 bit_pos -= ntohl(batadv_ogm_packet->seqno);
1118 batadv_set_bit(word, bit_pos);
1119 weight = &orig_neigh_node->bcast_own_sum[if_num];
1120 *weight = bitmap_weight(word,
1121 BATADV_TQ_LOCAL_WINDOW_SIZE);
1122 spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
1123 }
1124
1125 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1126 "Drop packet: originator packet from myself (via neighbor)\n");
1127 batadv_orig_node_free_ref(orig_neigh_node);
1128 return;
1129 }
1130
1131 if (is_my_oldorig) {
1132 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1133 "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1134 ethhdr->h_source);
1135 return;
1136 }
1137
1138 if (batadv_ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
1139 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1140 "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1141 ethhdr->h_source);
1142 return;
1143 }
1144
1145 orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig);
1146 if (!orig_node)
1147 return;
1148
1149 is_duplicate = batadv_iv_ogm_update_seqnos(ethhdr, batadv_ogm_packet,
1150 if_incoming);
1151
1152 if (is_duplicate == -1) {
1153 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1154 "Drop packet: packet within seqno protection time (sender: %pM)\n",
1155 ethhdr->h_source);
1156 goto out;
1157 }
1158
1159 if (batadv_ogm_packet->tq == 0) {
1160 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1161 "Drop packet: originator packet with tq equal 0\n");
1162 goto out;
1163 }
1164
1165 router = batadv_orig_node_get_router(orig_node);
1166 if (router)
1167 router_router = batadv_orig_node_get_router(router->orig_node);
1168
1169 if ((router && router->tq_avg != 0) &&
1170 (batadv_compare_eth(router->addr, ethhdr->h_source)))
1171 is_from_best_next_hop = true;
1172
1173 prev_sender = batadv_ogm_packet->prev_sender;
1174 /* avoid temporary routing loops */
1175 if (router && router_router &&
1176 (batadv_compare_eth(router->addr, prev_sender)) &&
1177 !(batadv_compare_eth(batadv_ogm_packet->orig, prev_sender)) &&
1178 (batadv_compare_eth(router->addr, router_router->addr))) {
1179 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1180 "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1181 ethhdr->h_source);
1182 goto out;
1183 }
1184
1185 /* if sender is a direct neighbor the sender mac equals
1186 * originator mac
1187 */
1188 if (is_single_hop_neigh)
1189 orig_neigh_node = orig_node;
1190 else
1191 orig_neigh_node = batadv_get_orig_node(bat_priv,
1192 ethhdr->h_source);
1193
1194 if (!orig_neigh_node)
1195 goto out;
1196
1197 orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node);
1198
1199 /* drop packet if sender is not a direct neighbor and if we
1200 * don't route towards it
1201 */
1202 if (!is_single_hop_neigh && (!orig_neigh_router)) {
1203 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1204 "Drop packet: OGM via unknown neighbor!\n");
1205 goto out_neigh;
1206 }
1207
1208 is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1209 batadv_ogm_packet, if_incoming);
1210
1211 batadv_bonding_save_primary(orig_node, orig_neigh_node,
1212 batadv_ogm_packet);
1213
1214 /* update ranking if it is not a duplicate or has the same
1215 * seqno and similar ttl as the non-duplicate
1216 */
1217 sameseq = orig_node->last_real_seqno == ntohl(batadv_ogm_packet->seqno);
1218 simlar_ttl = orig_node->last_ttl - 3 <= batadv_ogm_packet->header.ttl;
1219 if (is_bidirect && (!is_duplicate || (sameseq && simlar_ttl)))
1220 batadv_iv_ogm_orig_update(bat_priv, orig_node, ethhdr,
1221 batadv_ogm_packet, if_incoming,
1222 tt_buff, is_duplicate);
1223
1224 /* is single hop (direct) neighbor */
1225 if (is_single_hop_neigh) {
1226
1227 /* mark direct link on incoming interface */
1228 batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
1229 is_single_hop_neigh,
1230 is_from_best_next_hop, if_incoming);
1231
1232 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1233 "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1234 goto out_neigh;
1235 }
1236
1237 /* multihop originator */
1238 if (!is_bidirect) {
1239 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1240 "Drop packet: not received via bidirectional link\n");
1241 goto out_neigh;
1242 }
1243
1244 if (is_duplicate) {
1245 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1246 "Drop packet: duplicate packet received\n");
1247 goto out_neigh;
1248 }
1249
1250 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1251 "Forwarding packet: rebroadcast originator packet\n");
1252 batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
1253 is_single_hop_neigh, is_from_best_next_hop,
1254 if_incoming);
1255
1256 out_neigh:
1257 if ((orig_neigh_node) && (!is_single_hop_neigh))
1258 batadv_orig_node_free_ref(orig_neigh_node);
1259 out:
1260 if (router)
1261 batadv_neigh_node_free_ref(router);
1262 if (router_router)
1263 batadv_neigh_node_free_ref(router_router);
1264 if (orig_neigh_router)
1265 batadv_neigh_node_free_ref(orig_neigh_router);
1266
1267 batadv_orig_node_free_ref(orig_node);
1268 }
1269
1270 static int batadv_iv_ogm_receive(struct sk_buff *skb,
1271 struct batadv_hard_iface *if_incoming)
1272 {
1273 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1274 struct batadv_ogm_packet *batadv_ogm_packet;
1275 struct ethhdr *ethhdr;
1276 int buff_pos = 0, packet_len;
1277 unsigned char *tt_buff, *packet_buff;
1278 bool ret;
1279 uint8_t *packet_pos;
1280
1281 ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
1282 if (!ret)
1283 return NET_RX_DROP;
1284
1285 /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1286 * that does not have B.A.T.M.A.N. IV enabled ?
1287 */
1288 if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
1289 return NET_RX_DROP;
1290
1291 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1292 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
1293 skb->len + ETH_HLEN);
1294
1295 packet_len = skb_headlen(skb);
1296 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1297 packet_buff = skb->data;
1298 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
1299
1300 /* unpack the aggregated packets and process them one by one */
1301 do {
1302 tt_buff = packet_buff + buff_pos + BATADV_OGM_HLEN;
1303
1304 batadv_iv_ogm_process(ethhdr, batadv_ogm_packet, tt_buff,
1305 if_incoming);
1306
1307 buff_pos += BATADV_OGM_HLEN;
1308 buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes);
1309
1310 packet_pos = packet_buff + buff_pos;
1311 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
1312 } while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len,
1313 batadv_ogm_packet->tt_num_changes));
1314
1315 kfree_skb(skb);
1316 return NET_RX_SUCCESS;
1317 }
1318
1319 static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
1320 .name = "BATMAN_IV",
1321 .bat_iface_enable = batadv_iv_ogm_iface_enable,
1322 .bat_iface_disable = batadv_iv_ogm_iface_disable,
1323 .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
1324 .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
1325 .bat_ogm_schedule = batadv_iv_ogm_schedule,
1326 .bat_ogm_emit = batadv_iv_ogm_emit,
1327 };
1328
1329 int __init batadv_iv_init(void)
1330 {
1331 int ret;
1332
1333 /* batman originator packet */
1334 ret = batadv_recv_handler_register(BATADV_IV_OGM,
1335 batadv_iv_ogm_receive);
1336 if (ret < 0)
1337 goto out;
1338
1339 ret = batadv_algo_register(&batadv_batman_iv);
1340 if (ret < 0)
1341 goto handler_unregister;
1342
1343 goto out;
1344
1345 handler_unregister:
1346 batadv_recv_handler_unregister(BATADV_IV_OGM);
1347 out:
1348 return ret;
1349 }
Linux kernel - Deliverables
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