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staging: rtl8192u: fix spaces in array indexing in r8192U_core.c
[linux-2.6.git] / net / batman-adv / bat_iv_ogm.c
blob071f288b77a86c8c88b6eadd9634a24cdb209e81
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, __be32 seqno)
37 {
38 struct batadv_neigh_node *neigh_node;
39
40 neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr,
41 ntohl(seqno));
42 if (!neigh_node)
43 goto out;
44
45 INIT_LIST_HEAD(&neigh_node->bonding_list);
46
47 neigh_node->orig_node = orig_neigh;
48 neigh_node->if_incoming = hard_iface;
49
50 spin_lock_bh(&orig_node->neigh_list_lock);
51 hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
52 spin_unlock_bh(&orig_node->neigh_list_lock);
53
54 out:
55 return neigh_node;
56 }
57
58 static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
59 {
60 struct batadv_ogm_packet *batadv_ogm_packet;
61 unsigned char *ogm_buff;
62 uint32_t random_seqno;
63 int res = -ENOMEM;
64
65 /* randomize initial seqno to avoid collision */
66 get_random_bytes(&random_seqno, sizeof(random_seqno));
67 atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno);
68
69 hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN;
70 ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC);
71 if (!ogm_buff)
72 goto out;
73
74 hard_iface->bat_iv.ogm_buff = ogm_buff;
75
76 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
77 batadv_ogm_packet->header.packet_type = BATADV_IV_OGM;
78 batadv_ogm_packet->header.version = BATADV_COMPAT_VERSION;
79 batadv_ogm_packet->header.ttl = 2;
80 batadv_ogm_packet->flags = BATADV_NO_FLAGS;
81 batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
82 batadv_ogm_packet->tt_num_changes = 0;
83 batadv_ogm_packet->ttvn = 0;
84
85 res = 0;
86
87 out:
88 return res;
89 }
90
91 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
92 {
93 kfree(hard_iface->bat_iv.ogm_buff);
94 hard_iface->bat_iv.ogm_buff = NULL;
95 }
96
97 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
98 {
99 struct batadv_ogm_packet *batadv_ogm_packet;
100 unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
101
102 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
103 memcpy(batadv_ogm_packet->orig,
104 hard_iface->net_dev->dev_addr, ETH_ALEN);
105 memcpy(batadv_ogm_packet->prev_sender,
106 hard_iface->net_dev->dev_addr, ETH_ALEN);
107 }
108
109 static void
110 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
111 {
112 struct batadv_ogm_packet *batadv_ogm_packet;
113 unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
114
115 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
116 batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP;
117 batadv_ogm_packet->header.ttl = BATADV_TTL;
118 }
119
120 /* when do we schedule our own ogm to be sent */
121 static unsigned long
122 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
123 {
124 unsigned int msecs;
125
126 msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
127 msecs += prandom_u32() % (2 * BATADV_JITTER);
128
129 return jiffies + msecs_to_jiffies(msecs);
130 }
131
132 /* when do we schedule a ogm packet to be sent */
133 static unsigned long batadv_iv_ogm_fwd_send_time(void)
134 {
135 return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2));
136 }
137
138 /* apply hop penalty for a normal link */
139 static uint8_t batadv_hop_penalty(uint8_t tq,
140 const struct batadv_priv *bat_priv)
141 {
142 int hop_penalty = atomic_read(&bat_priv->hop_penalty);
143 int new_tq;
144
145 new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
146 new_tq /= BATADV_TQ_MAX_VALUE;
147
148 return new_tq;
149 }
150
151 /* is there another aggregated packet here? */
152 static int batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
153 int tt_num_changes)
154 {
155 int next_buff_pos = 0;
156
157 next_buff_pos += buff_pos + BATADV_OGM_HLEN;
158 next_buff_pos += batadv_tt_len(tt_num_changes);
159
160 return (next_buff_pos <= packet_len) &&
161 (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
162 }
163
164 /* send a batman ogm to a given interface */
165 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
166 struct batadv_hard_iface *hard_iface)
167 {
168 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
169 char *fwd_str;
170 uint8_t packet_num;
171 int16_t buff_pos;
172 struct batadv_ogm_packet *batadv_ogm_packet;
173 struct sk_buff *skb;
174 uint8_t *packet_pos;
175
176 if (hard_iface->if_status != BATADV_IF_ACTIVE)
177 return;
178
179 packet_num = 0;
180 buff_pos = 0;
181 packet_pos = forw_packet->skb->data;
182 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
183
184 /* adjust all flags and log packets */
185 while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
186 batadv_ogm_packet->tt_num_changes)) {
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 /* FIXME: what about aggregated packets ? */
265 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
266 "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n",
267 (forw_packet->own ? "Sending own" : "Forwarding"),
268 batadv_ogm_packet->orig,
269 ntohl(batadv_ogm_packet->seqno),
270 batadv_ogm_packet->header.ttl,
271 forw_packet->if_incoming->net_dev->name,
272 forw_packet->if_incoming->net_dev->dev_addr);
273
274 /* skb is only used once and than forw_packet is free'd */
275 batadv_send_skb_packet(forw_packet->skb,
276 forw_packet->if_incoming,
277 batadv_broadcast_addr);
278 forw_packet->skb = NULL;
279
280 goto out;
281 }
282
283 /* broadcast on every interface */
284 rcu_read_lock();
285 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
286 if (hard_iface->soft_iface != soft_iface)
287 continue;
288
289 batadv_iv_ogm_send_to_if(forw_packet, hard_iface);
290 }
291 rcu_read_unlock();
292
293 out:
294 if (primary_if)
295 batadv_hardif_free_ref(primary_if);
296 }
297
298 /* return true if new_packet can be aggregated with forw_packet */
299 static bool
300 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
301 struct batadv_priv *bat_priv,
302 int packet_len, unsigned long send_time,
303 bool directlink,
304 const struct batadv_hard_iface *if_incoming,
305 const struct batadv_forw_packet *forw_packet)
306 {
307 struct batadv_ogm_packet *batadv_ogm_packet;
308 int aggregated_bytes = forw_packet->packet_len + packet_len;
309 struct batadv_hard_iface *primary_if = NULL;
310 bool res = false;
311 unsigned long aggregation_end_time;
312
313 batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
314 aggregation_end_time = send_time;
315 aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
316
317 /* we can aggregate the current packet to this aggregated packet
318 * if:
319 *
320 * - the send time is within our MAX_AGGREGATION_MS time
321 * - the resulting packet wont be bigger than
322 * MAX_AGGREGATION_BYTES
323 */
324 if (time_before(send_time, forw_packet->send_time) &&
325 time_after_eq(aggregation_end_time, forw_packet->send_time) &&
326 (aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) {
327 /* check aggregation compatibility
328 * -> direct link packets are broadcasted on
329 * their interface only
330 * -> aggregate packet if the current packet is
331 * a "global" packet as well as the base
332 * packet
333 */
334 primary_if = batadv_primary_if_get_selected(bat_priv);
335 if (!primary_if)
336 goto out;
337
338 /* packets without direct link flag and high TTL
339 * are flooded through the net
340 */
341 if ((!directlink) &&
342 (!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) &&
343 (batadv_ogm_packet->header.ttl != 1) &&
344
345 /* own packets originating non-primary
346 * interfaces leave only that interface
347 */
348 ((!forw_packet->own) ||
349 (forw_packet->if_incoming == primary_if))) {
350 res = true;
351 goto out;
352 }
353
354 /* if the incoming packet is sent via this one
355 * interface only - we still can aggregate
356 */
357 if ((directlink) &&
358 (new_bat_ogm_packet->header.ttl == 1) &&
359 (forw_packet->if_incoming == if_incoming) &&
360
361 /* packets from direct neighbors or
362 * own secondary interface packets
363 * (= secondary interface packets in general)
364 */
365 (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
366 (forw_packet->own &&
367 forw_packet->if_incoming != primary_if))) {
368 res = true;
369 goto out;
370 }
371 }
372
373 out:
374 if (primary_if)
375 batadv_hardif_free_ref(primary_if);
376 return res;
377 }
378
379 /* create a new aggregated packet and add this packet to it */
380 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
381 int packet_len, unsigned long send_time,
382 bool direct_link,
383 struct batadv_hard_iface *if_incoming,
384 int own_packet)
385 {
386 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
387 struct batadv_forw_packet *forw_packet_aggr;
388 unsigned char *skb_buff;
389 unsigned int skb_size;
390
391 if (!atomic_inc_not_zero(&if_incoming->refcount))
392 return;
393
394 /* own packet should always be scheduled */
395 if (!own_packet) {
396 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
397 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
398 "batman packet queue full\n");
399 goto out;
400 }
401 }
402
403 forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
404 if (!forw_packet_aggr) {
405 if (!own_packet)
406 atomic_inc(&bat_priv->batman_queue_left);
407 goto out;
408 }
409
410 if ((atomic_read(&bat_priv->aggregated_ogms)) &&
411 (packet_len < BATADV_MAX_AGGREGATION_BYTES))
412 skb_size = BATADV_MAX_AGGREGATION_BYTES;
413 else
414 skb_size = packet_len;
415
416 skb_size += ETH_HLEN + NET_IP_ALIGN;
417
418 forw_packet_aggr->skb = dev_alloc_skb(skb_size);
419 if (!forw_packet_aggr->skb) {
420 if (!own_packet)
421 atomic_inc(&bat_priv->batman_queue_left);
422 kfree(forw_packet_aggr);
423 goto out;
424 }
425 skb_reserve(forw_packet_aggr->skb, ETH_HLEN + NET_IP_ALIGN);
426
427 INIT_HLIST_NODE(&forw_packet_aggr->list);
428
429 skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
430 forw_packet_aggr->packet_len = packet_len;
431 memcpy(skb_buff, packet_buff, packet_len);
432
433 forw_packet_aggr->own = own_packet;
434 forw_packet_aggr->if_incoming = if_incoming;
435 forw_packet_aggr->num_packets = 0;
436 forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
437 forw_packet_aggr->send_time = send_time;
438
439 /* save packet direct link flag status */
440 if (direct_link)
441 forw_packet_aggr->direct_link_flags |= 1;
442
443 /* add new packet to packet list */
444 spin_lock_bh(&bat_priv->forw_bat_list_lock);
445 hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
446 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
447
448 /* start timer for this packet */
449 INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
450 batadv_send_outstanding_bat_ogm_packet);
451 queue_delayed_work(batadv_event_workqueue,
452 &forw_packet_aggr->delayed_work,
453 send_time - jiffies);
454
455 return;
456 out:
457 batadv_hardif_free_ref(if_incoming);
458 }
459
460 /* aggregate a new packet into the existing ogm packet */
461 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
462 const unsigned char *packet_buff,
463 int packet_len, bool direct_link)
464 {
465 unsigned char *skb_buff;
466 unsigned long new_direct_link_flag;
467
468 skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
469 memcpy(skb_buff, packet_buff, packet_len);
470 forw_packet_aggr->packet_len += packet_len;
471 forw_packet_aggr->num_packets++;
472
473 /* save packet direct link flag status */
474 if (direct_link) {
475 new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
476 forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
477 }
478 }
479
480 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
481 unsigned char *packet_buff,
482 int packet_len,
483 struct batadv_hard_iface *if_incoming,
484 int own_packet, unsigned long send_time)
485 {
486 /* _aggr -> pointer to the packet we want to aggregate with
487 * _pos -> pointer to the position in the queue
488 */
489 struct batadv_forw_packet *forw_packet_aggr = NULL;
490 struct batadv_forw_packet *forw_packet_pos = NULL;
491 struct batadv_ogm_packet *batadv_ogm_packet;
492 bool direct_link;
493 unsigned long max_aggregation_jiffies;
494
495 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
496 direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0;
497 max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
498
499 /* find position for the packet in the forward queue */
500 spin_lock_bh(&bat_priv->forw_bat_list_lock);
501 /* own packets are not to be aggregated */
502 if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
503 hlist_for_each_entry(forw_packet_pos,
504 &bat_priv->forw_bat_list, list) {
505 if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
506 bat_priv, packet_len,
507 send_time, direct_link,
508 if_incoming,
509 forw_packet_pos)) {
510 forw_packet_aggr = forw_packet_pos;
511 break;
512 }
513 }
514 }
515
516 /* nothing to aggregate with - either aggregation disabled or no
517 * suitable aggregation packet found
518 */
519 if (!forw_packet_aggr) {
520 /* the following section can run without the lock */
521 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
522
523 /* if we could not aggregate this packet with one of the others
524 * we hold it back for a while, so that it might be aggregated
525 * later on
526 */
527 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
528 send_time += max_aggregation_jiffies;
529
530 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
531 send_time, direct_link,
532 if_incoming, own_packet);
533 } else {
534 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
535 packet_len, direct_link);
536 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
537 }
538 }
539
540 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
541 const struct ethhdr *ethhdr,
542 struct batadv_ogm_packet *batadv_ogm_packet,
543 bool is_single_hop_neigh,
544 bool is_from_best_next_hop,
545 struct batadv_hard_iface *if_incoming)
546 {
547 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
548 uint8_t tt_num_changes;
549
550 if (batadv_ogm_packet->header.ttl <= 1) {
551 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
552 return;
553 }
554
555 if (!is_from_best_next_hop) {
556 /* Mark the forwarded packet when it is not coming from our
557 * best next hop. We still need to forward the packet for our
558 * neighbor link quality detection to work in case the packet
559 * originated from a single hop neighbor. Otherwise we can
560 * simply drop the ogm.
561 */
562 if (is_single_hop_neigh)
563 batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
564 else
565 return;
566 }
567
568 tt_num_changes = batadv_ogm_packet->tt_num_changes;
569
570 batadv_ogm_packet->header.ttl--;
571 memcpy(batadv_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
572
573 /* apply hop penalty */
574 batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
575 bat_priv);
576
577 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
578 "Forwarding packet: tq: %i, ttl: %i\n",
579 batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl);
580
581 /* switch of primaries first hop flag when forwarding */
582 batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP;
583 if (is_single_hop_neigh)
584 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
585 else
586 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
587
588 batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
589 BATADV_OGM_HLEN + batadv_tt_len(tt_num_changes),
590 if_incoming, 0, batadv_iv_ogm_fwd_send_time());
591 }
592
593 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
594 {
595 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
596 unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
597 struct batadv_ogm_packet *batadv_ogm_packet;
598 struct batadv_hard_iface *primary_if;
599 int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
600 int vis_server, tt_num_changes = 0;
601 uint32_t seqno;
602 uint8_t bandwidth;
603
604 vis_server = atomic_read(&bat_priv->vis_mode);
605 primary_if = batadv_primary_if_get_selected(bat_priv);
606
607 if (hard_iface == primary_if)
608 tt_num_changes = batadv_tt_append_diff(bat_priv, ogm_buff,
609 ogm_buff_len,
610 BATADV_OGM_HLEN);
611
612 batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
613
614 /* change sequence number to network order */
615 seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno);
616 batadv_ogm_packet->seqno = htonl(seqno);
617 atomic_inc(&hard_iface->bat_iv.ogm_seqno);
618
619 batadv_ogm_packet->ttvn = atomic_read(&bat_priv->tt.vn);
620 batadv_ogm_packet->tt_crc = htons(bat_priv->tt.local_crc);
621 if (tt_num_changes >= 0)
622 batadv_ogm_packet->tt_num_changes = tt_num_changes;
623
624 if (vis_server == BATADV_VIS_TYPE_SERVER_SYNC)
625 batadv_ogm_packet->flags |= BATADV_VIS_SERVER;
626 else
627 batadv_ogm_packet->flags &= ~BATADV_VIS_SERVER;
628
629 if (hard_iface == primary_if &&
630 atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_SERVER) {
631 bandwidth = (uint8_t)atomic_read(&bat_priv->gw_bandwidth);
632 batadv_ogm_packet->gw_flags = bandwidth;
633 } else {
634 batadv_ogm_packet->gw_flags = BATADV_NO_FLAGS;
635 }
636
637 batadv_slide_own_bcast_window(hard_iface);
638 batadv_iv_ogm_queue_add(bat_priv, hard_iface->bat_iv.ogm_buff,
639 hard_iface->bat_iv.ogm_buff_len, hard_iface, 1,
640 batadv_iv_ogm_emit_send_time(bat_priv));
641
642 if (primary_if)
643 batadv_hardif_free_ref(primary_if);
644 }
645
646 static void
647 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
648 struct batadv_orig_node *orig_node,
649 const struct ethhdr *ethhdr,
650 const struct batadv_ogm_packet *batadv_ogm_packet,
651 struct batadv_hard_iface *if_incoming,
652 const unsigned char *tt_buff,
653 int is_duplicate)
654 {
655 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
656 struct batadv_neigh_node *router = NULL;
657 struct batadv_orig_node *orig_node_tmp;
658 int if_num;
659 uint8_t sum_orig, sum_neigh;
660 uint8_t *neigh_addr;
661 uint8_t tq_avg;
662
663 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
664 "update_originator(): Searching and updating originator entry of received packet\n");
665
666 rcu_read_lock();
667 hlist_for_each_entry_rcu(tmp_neigh_node,
668 &orig_node->neigh_list, list) {
669 neigh_addr = tmp_neigh_node->addr;
670 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
671 tmp_neigh_node->if_incoming == if_incoming &&
672 atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
673 if (neigh_node)
674 batadv_neigh_node_free_ref(neigh_node);
675 neigh_node = tmp_neigh_node;
676 continue;
677 }
678
679 if (is_duplicate)
680 continue;
681
682 spin_lock_bh(&tmp_neigh_node->lq_update_lock);
683 batadv_ring_buffer_set(tmp_neigh_node->tq_recv,
684 &tmp_neigh_node->tq_index, 0);
685 tq_avg = batadv_ring_buffer_avg(tmp_neigh_node->tq_recv);
686 tmp_neigh_node->tq_avg = tq_avg;
687 spin_unlock_bh(&tmp_neigh_node->lq_update_lock);
688 }
689
690 if (!neigh_node) {
691 struct batadv_orig_node *orig_tmp;
692
693 orig_tmp = batadv_get_orig_node(bat_priv, ethhdr->h_source);
694 if (!orig_tmp)
695 goto unlock;
696
697 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
698 ethhdr->h_source,
699 orig_node, orig_tmp,
700 batadv_ogm_packet->seqno);
701
702 batadv_orig_node_free_ref(orig_tmp);
703 if (!neigh_node)
704 goto unlock;
705 } else
706 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
707 "Updating existing last-hop neighbor of originator\n");
708
709 rcu_read_unlock();
710
711 orig_node->flags = batadv_ogm_packet->flags;
712 neigh_node->last_seen = jiffies;
713
714 spin_lock_bh(&neigh_node->lq_update_lock);
715 batadv_ring_buffer_set(neigh_node->tq_recv,
716 &neigh_node->tq_index,
717 batadv_ogm_packet->tq);
718 neigh_node->tq_avg = batadv_ring_buffer_avg(neigh_node->tq_recv);
719 spin_unlock_bh(&neigh_node->lq_update_lock);
720
721 if (!is_duplicate) {
722 orig_node->last_ttl = batadv_ogm_packet->header.ttl;
723 neigh_node->last_ttl = batadv_ogm_packet->header.ttl;
724 }
725
726 batadv_bonding_candidate_add(orig_node, neigh_node);
727
728 /* if this neighbor already is our next hop there is nothing
729 * to change
730 */
731 router = batadv_orig_node_get_router(orig_node);
732 if (router == neigh_node)
733 goto update_tt;
734
735 /* if this neighbor does not offer a better TQ we won't consider it */
736 if (router && (router->tq_avg > neigh_node->tq_avg))
737 goto update_tt;
738
739 /* if the TQ is the same and the link not more symmetric we
740 * won't consider it either
741 */
742 if (router && (neigh_node->tq_avg == router->tq_avg)) {
743 orig_node_tmp = router->orig_node;
744 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
745 if_num = router->if_incoming->if_num;
746 sum_orig = orig_node_tmp->bcast_own_sum[if_num];
747 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
748
749 orig_node_tmp = neigh_node->orig_node;
750 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
751 if_num = neigh_node->if_incoming->if_num;
752 sum_neigh = orig_node_tmp->bcast_own_sum[if_num];
753 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
754
755 if (sum_orig >= sum_neigh)
756 goto update_tt;
757 }
758
759 batadv_update_route(bat_priv, orig_node, neigh_node);
760
761 update_tt:
762 /* I have to check for transtable changes only if the OGM has been
763 * sent through a primary interface
764 */
765 if (((batadv_ogm_packet->orig != ethhdr->h_source) &&
766 (batadv_ogm_packet->header.ttl > 2)) ||
767 (batadv_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP))
768 batadv_tt_update_orig(bat_priv, orig_node, tt_buff,
769 batadv_ogm_packet->tt_num_changes,
770 batadv_ogm_packet->ttvn,
771 ntohs(batadv_ogm_packet->tt_crc));
772
773 if (orig_node->gw_flags != batadv_ogm_packet->gw_flags)
774 batadv_gw_node_update(bat_priv, orig_node,
775 batadv_ogm_packet->gw_flags);
776
777 orig_node->gw_flags = batadv_ogm_packet->gw_flags;
778
779 /* restart gateway selection if fast or late switching was enabled */
780 if ((orig_node->gw_flags) &&
781 (atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_CLIENT) &&
782 (atomic_read(&bat_priv->gw_sel_class) > 2))
783 batadv_gw_check_election(bat_priv, orig_node);
784
785 goto out;
786
787 unlock:
788 rcu_read_unlock();
789 out:
790 if (neigh_node)
791 batadv_neigh_node_free_ref(neigh_node);
792 if (router)
793 batadv_neigh_node_free_ref(router);
794 }
795
796 static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
797 struct batadv_orig_node *orig_neigh_node,
798 struct batadv_ogm_packet *batadv_ogm_packet,
799 struct batadv_hard_iface *if_incoming)
800 {
801 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
802 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
803 uint8_t total_count;
804 uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
805 unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
806 int tq_asym_penalty, inv_asym_penalty, ret = 0;
807 unsigned int combined_tq;
808
809 /* find corresponding one hop neighbor */
810 rcu_read_lock();
811 hlist_for_each_entry_rcu(tmp_neigh_node,
812 &orig_neigh_node->neigh_list, list) {
813 if (!batadv_compare_eth(tmp_neigh_node->addr,
814 orig_neigh_node->orig))
815 continue;
816
817 if (tmp_neigh_node->if_incoming != if_incoming)
818 continue;
819
820 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
821 continue;
822
823 neigh_node = tmp_neigh_node;
824 break;
825 }
826 rcu_read_unlock();
827
828 if (!neigh_node)
829 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
830 orig_neigh_node->orig,
831 orig_neigh_node,
832 orig_neigh_node,
833 batadv_ogm_packet->seqno);
834
835 if (!neigh_node)
836 goto out;
837
838 /* if orig_node is direct neighbor update neigh_node last_seen */
839 if (orig_node == orig_neigh_node)
840 neigh_node->last_seen = jiffies;
841
842 orig_node->last_seen = jiffies;
843
844 /* find packet count of corresponding one hop neighbor */
845 spin_lock_bh(&orig_node->ogm_cnt_lock);
846 orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];
847 neigh_rq_count = neigh_node->real_packet_count;
848 spin_unlock_bh(&orig_node->ogm_cnt_lock);
849
850 /* pay attention to not get a value bigger than 100 % */
851 if (orig_eq_count > neigh_rq_count)
852 total_count = neigh_rq_count;
853 else
854 total_count = orig_eq_count;
855
856 /* if we have too few packets (too less data) we set tq_own to zero
857 * if we receive too few packets it is not considered bidirectional
858 */
859 if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
860 neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
861 tq_own = 0;
862 else
863 /* neigh_node->real_packet_count is never zero as we
864 * only purge old information when getting new
865 * information
866 */
867 tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count;
868
869 /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
870 * affect the nearly-symmetric links only a little, but
871 * punishes asymmetric links more. This will give a value
872 * between 0 and TQ_MAX_VALUE
873 */
874 neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
875 neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
876 neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
877 BATADV_TQ_LOCAL_WINDOW_SIZE *
878 BATADV_TQ_LOCAL_WINDOW_SIZE;
879 inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
880 inv_asym_penalty /= neigh_rq_max_cube;
881 tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
882
883 combined_tq = batadv_ogm_packet->tq * tq_own * tq_asym_penalty;
884 combined_tq /= BATADV_TQ_MAX_VALUE * BATADV_TQ_MAX_VALUE;
885 batadv_ogm_packet->tq = combined_tq;
886
887 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
888 "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n",
889 orig_node->orig, orig_neigh_node->orig, total_count,
890 neigh_rq_count, tq_own,
891 tq_asym_penalty, batadv_ogm_packet->tq);
892
893 /* if link has the minimum required transmission quality
894 * consider it bidirectional
895 */
896 if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
897 ret = 1;
898
899 out:
900 if (neigh_node)
901 batadv_neigh_node_free_ref(neigh_node);
902 return ret;
903 }
904
905 /* processes a batman packet for all interfaces, adjusts the sequence number and
906 * finds out whether it is a duplicate.
907 * returns:
908 * 1 the packet is a duplicate
909 * 0 the packet has not yet been received
910 * -1 the packet is old and has been received while the seqno window
911 * was protected. Caller should drop it.
912 */
913 static int
914 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
915 const struct batadv_ogm_packet *batadv_ogm_packet,
916 const struct batadv_hard_iface *if_incoming)
917 {
918 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
919 struct batadv_orig_node *orig_node;
920 struct batadv_neigh_node *tmp_neigh_node;
921 int is_duplicate = 0;
922 int32_t seq_diff;
923 int need_update = 0;
924 int set_mark, ret = -1;
925 uint32_t seqno = ntohl(batadv_ogm_packet->seqno);
926 uint8_t *neigh_addr;
927 uint8_t packet_count;
928
929 orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig);
930 if (!orig_node)
931 return 0;
932
933 spin_lock_bh(&orig_node->ogm_cnt_lock);
934 seq_diff = seqno - orig_node->last_real_seqno;
935
936 /* signalize caller that the packet is to be dropped. */
937 if (!hlist_empty(&orig_node->neigh_list) &&
938 batadv_window_protected(bat_priv, seq_diff,
939 &orig_node->batman_seqno_reset))
940 goto out;
941
942 rcu_read_lock();
943 hlist_for_each_entry_rcu(tmp_neigh_node,
944 &orig_node->neigh_list, list) {
945 is_duplicate |= batadv_test_bit(tmp_neigh_node->real_bits,
946 orig_node->last_real_seqno,
947 seqno);
948
949 neigh_addr = tmp_neigh_node->addr;
950 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
951 tmp_neigh_node->if_incoming == if_incoming)
952 set_mark = 1;
953 else
954 set_mark = 0;
955
956 /* if the window moved, set the update flag. */
957 need_update |= batadv_bit_get_packet(bat_priv,
958 tmp_neigh_node->real_bits,
959 seq_diff, set_mark);
960
961 packet_count = bitmap_weight(tmp_neigh_node->real_bits,
962 BATADV_TQ_LOCAL_WINDOW_SIZE);
963 tmp_neigh_node->real_packet_count = packet_count;
964 }
965 rcu_read_unlock();
966
967 if (need_update) {
968 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
969 "updating last_seqno: old %u, new %u\n",
970 orig_node->last_real_seqno, seqno);
971 orig_node->last_real_seqno = seqno;
972 }
973
974 ret = is_duplicate;
975
976 out:
977 spin_unlock_bh(&orig_node->ogm_cnt_lock);
978 batadv_orig_node_free_ref(orig_node);
979 return ret;
980 }
981
982 static void batadv_iv_ogm_process(const struct ethhdr *ethhdr,
983 struct batadv_ogm_packet *batadv_ogm_packet,
984 const unsigned char *tt_buff,
985 struct batadv_hard_iface *if_incoming)
986 {
987 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
988 struct batadv_hard_iface *hard_iface;
989 struct batadv_orig_node *orig_neigh_node, *orig_node;
990 struct batadv_neigh_node *router = NULL, *router_router = NULL;
991 struct batadv_neigh_node *orig_neigh_router = NULL;
992 int has_directlink_flag;
993 int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
994 int is_broadcast = 0, is_bidirect;
995 bool is_single_hop_neigh = false;
996 bool is_from_best_next_hop = false;
997 int is_duplicate, sameseq, simlar_ttl;
998 uint32_t if_incoming_seqno;
999 uint8_t *prev_sender;
1000
1001 /* Silently drop when the batman packet is actually not a
1002 * correct packet.
1003 *
1004 * This might happen if a packet is padded (e.g. Ethernet has a
1005 * minimum frame length of 64 byte) and the aggregation interprets
1006 * it as an additional length.
1007 *
1008 * TODO: A more sane solution would be to have a bit in the
1009 * batadv_ogm_packet to detect whether the packet is the last
1010 * packet in an aggregation. Here we expect that the padding
1011 * is always zero (or not 0x01)
1012 */
1013 if (batadv_ogm_packet->header.packet_type != BATADV_IV_OGM)
1014 return;
1015
1016 /* could be changed by schedule_own_packet() */
1017 if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
1018
1019 if (batadv_ogm_packet->flags & BATADV_DIRECTLINK)
1020 has_directlink_flag = 1;
1021 else
1022 has_directlink_flag = 0;
1023
1024 if (batadv_compare_eth(ethhdr->h_source, batadv_ogm_packet->orig))
1025 is_single_hop_neigh = true;
1026
1027 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1028 "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",
1029 ethhdr->h_source, if_incoming->net_dev->name,
1030 if_incoming->net_dev->dev_addr, batadv_ogm_packet->orig,
1031 batadv_ogm_packet->prev_sender,
1032 ntohl(batadv_ogm_packet->seqno), batadv_ogm_packet->ttvn,
1033 ntohs(batadv_ogm_packet->tt_crc),
1034 batadv_ogm_packet->tt_num_changes, batadv_ogm_packet->tq,
1035 batadv_ogm_packet->header.ttl,
1036 batadv_ogm_packet->header.version, has_directlink_flag);
1037
1038 rcu_read_lock();
1039 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1040 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1041 continue;
1042
1043 if (hard_iface->soft_iface != if_incoming->soft_iface)
1044 continue;
1045
1046 if (batadv_compare_eth(ethhdr->h_source,
1047 hard_iface->net_dev->dev_addr))
1048 is_my_addr = 1;
1049
1050 if (batadv_compare_eth(batadv_ogm_packet->orig,
1051 hard_iface->net_dev->dev_addr))
1052 is_my_orig = 1;
1053
1054 if (batadv_compare_eth(batadv_ogm_packet->prev_sender,
1055 hard_iface->net_dev->dev_addr))
1056 is_my_oldorig = 1;
1057
1058 if (is_broadcast_ether_addr(ethhdr->h_source))
1059 is_broadcast = 1;
1060 }
1061 rcu_read_unlock();
1062
1063 if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) {
1064 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1065 "Drop packet: incompatible batman version (%i)\n",
1066 batadv_ogm_packet->header.version);
1067 return;
1068 }
1069
1070 if (is_my_addr) {
1071 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1072 "Drop packet: received my own broadcast (sender: %pM)\n",
1073 ethhdr->h_source);
1074 return;
1075 }
1076
1077 if (is_broadcast) {
1078 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1079 "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n",
1080 ethhdr->h_source);
1081 return;
1082 }
1083
1084 if (is_my_orig) {
1085 unsigned long *word;
1086 int offset;
1087 int32_t bit_pos;
1088 int16_t if_num;
1089 uint8_t *weight;
1090
1091 orig_neigh_node = batadv_get_orig_node(bat_priv,
1092 ethhdr->h_source);
1093 if (!orig_neigh_node)
1094 return;
1095
1096 /* neighbor has to indicate direct link and it has to
1097 * come via the corresponding interface
1098 * save packet seqno for bidirectional check
1099 */
1100 if (has_directlink_flag &&
1101 batadv_compare_eth(if_incoming->net_dev->dev_addr,
1102 batadv_ogm_packet->orig)) {
1103 if_num = if_incoming->if_num;
1104 offset = if_num * BATADV_NUM_WORDS;
1105
1106 spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
1107 word = &(orig_neigh_node->bcast_own[offset]);
1108 bit_pos = if_incoming_seqno - 2;
1109 bit_pos -= ntohl(batadv_ogm_packet->seqno);
1110 batadv_set_bit(word, bit_pos);
1111 weight = &orig_neigh_node->bcast_own_sum[if_num];
1112 *weight = bitmap_weight(word,
1113 BATADV_TQ_LOCAL_WINDOW_SIZE);
1114 spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
1115 }
1116
1117 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1118 "Drop packet: originator packet from myself (via neighbor)\n");
1119 batadv_orig_node_free_ref(orig_neigh_node);
1120 return;
1121 }
1122
1123 if (is_my_oldorig) {
1124 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1125 "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1126 ethhdr->h_source);
1127 return;
1128 }
1129
1130 if (batadv_ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
1131 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1132 "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1133 ethhdr->h_source);
1134 return;
1135 }
1136
1137 orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig);
1138 if (!orig_node)
1139 return;
1140
1141 is_duplicate = batadv_iv_ogm_update_seqnos(ethhdr, batadv_ogm_packet,
1142 if_incoming);
1143
1144 if (is_duplicate == -1) {
1145 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1146 "Drop packet: packet within seqno protection time (sender: %pM)\n",
1147 ethhdr->h_source);
1148 goto out;
1149 }
1150
1151 if (batadv_ogm_packet->tq == 0) {
1152 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1153 "Drop packet: originator packet with tq equal 0\n");
1154 goto out;
1155 }
1156
1157 router = batadv_orig_node_get_router(orig_node);
1158 if (router)
1159 router_router = batadv_orig_node_get_router(router->orig_node);
1160
1161 if ((router && router->tq_avg != 0) &&
1162 (batadv_compare_eth(router->addr, ethhdr->h_source)))
1163 is_from_best_next_hop = true;
1164
1165 prev_sender = batadv_ogm_packet->prev_sender;
1166 /* avoid temporary routing loops */
1167 if (router && router_router &&
1168 (batadv_compare_eth(router->addr, prev_sender)) &&
1169 !(batadv_compare_eth(batadv_ogm_packet->orig, prev_sender)) &&
1170 (batadv_compare_eth(router->addr, router_router->addr))) {
1171 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1172 "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1173 ethhdr->h_source);
1174 goto out;
1175 }
1176
1177 /* if sender is a direct neighbor the sender mac equals
1178 * originator mac
1179 */
1180 if (is_single_hop_neigh)
1181 orig_neigh_node = orig_node;
1182 else
1183 orig_neigh_node = batadv_get_orig_node(bat_priv,
1184 ethhdr->h_source);
1185
1186 if (!orig_neigh_node)
1187 goto out;
1188
1189 /* Update nc_nodes of the originator */
1190 batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node,
1191 batadv_ogm_packet, is_single_hop_neigh);
1192
1193 orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node);
1194
1195 /* drop packet if sender is not a direct neighbor and if we
1196 * don't route towards it
1197 */
1198 if (!is_single_hop_neigh && (!orig_neigh_router)) {
1199 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1200 "Drop packet: OGM via unknown neighbor!\n");
1201 goto out_neigh;
1202 }
1203
1204 is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1205 batadv_ogm_packet, if_incoming);
1206
1207 batadv_bonding_save_primary(orig_node, orig_neigh_node,
1208 batadv_ogm_packet);
1209
1210 /* update ranking if it is not a duplicate or has the same
1211 * seqno and similar ttl as the non-duplicate
1212 */
1213 sameseq = orig_node->last_real_seqno == ntohl(batadv_ogm_packet->seqno);
1214 simlar_ttl = orig_node->last_ttl - 3 <= batadv_ogm_packet->header.ttl;
1215 if (is_bidirect && (!is_duplicate || (sameseq && simlar_ttl)))
1216 batadv_iv_ogm_orig_update(bat_priv, orig_node, ethhdr,
1217 batadv_ogm_packet, if_incoming,
1218 tt_buff, is_duplicate);
1219
1220 /* is single hop (direct) neighbor */
1221 if (is_single_hop_neigh) {
1222 /* mark direct link on incoming interface */
1223 batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
1224 is_single_hop_neigh,
1225 is_from_best_next_hop, if_incoming);
1226
1227 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1228 "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1229 goto out_neigh;
1230 }
1231
1232 /* multihop originator */
1233 if (!is_bidirect) {
1234 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1235 "Drop packet: not received via bidirectional link\n");
1236 goto out_neigh;
1237 }
1238
1239 if (is_duplicate) {
1240 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1241 "Drop packet: duplicate packet received\n");
1242 goto out_neigh;
1243 }
1244
1245 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1246 "Forwarding packet: rebroadcast originator packet\n");
1247 batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
1248 is_single_hop_neigh, is_from_best_next_hop,
1249 if_incoming);
1250
1251 out_neigh:
1252 if ((orig_neigh_node) && (!is_single_hop_neigh))
1253 batadv_orig_node_free_ref(orig_neigh_node);
1254 out:
1255 if (router)
1256 batadv_neigh_node_free_ref(router);
1257 if (router_router)
1258 batadv_neigh_node_free_ref(router_router);
1259 if (orig_neigh_router)
1260 batadv_neigh_node_free_ref(orig_neigh_router);
1261
1262 batadv_orig_node_free_ref(orig_node);
1263 }
1264
1265 static int batadv_iv_ogm_receive(struct sk_buff *skb,
1266 struct batadv_hard_iface *if_incoming)
1267 {
1268 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1269 struct batadv_ogm_packet *batadv_ogm_packet;
1270 struct ethhdr *ethhdr;
1271 int buff_pos = 0, packet_len;
1272 unsigned char *tt_buff, *packet_buff;
1273 bool ret;
1274 uint8_t *packet_pos;
1275
1276 ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
1277 if (!ret)
1278 return NET_RX_DROP;
1279
1280 /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1281 * that does not have B.A.T.M.A.N. IV enabled ?
1282 */
1283 if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
1284 return NET_RX_DROP;
1285
1286 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1287 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
1288 skb->len + ETH_HLEN);
1289
1290 packet_len = skb_headlen(skb);
1291 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1292 packet_buff = skb->data;
1293 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
1294
1295 /* unpack the aggregated packets and process them one by one */
1296 while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len,
1297 batadv_ogm_packet->tt_num_changes)) {
1298 tt_buff = packet_buff + buff_pos + BATADV_OGM_HLEN;
1299
1300 batadv_iv_ogm_process(ethhdr, batadv_ogm_packet, tt_buff,
1301 if_incoming);
1302
1303 buff_pos += BATADV_OGM_HLEN;
1304 buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes);
1305
1306 packet_pos = packet_buff + buff_pos;
1307 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
1308 }
1309
1310 kfree_skb(skb);
1311 return NET_RX_SUCCESS;
1312 }
1313
1314 static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
1315 .name = "BATMAN_IV",
1316 .bat_iface_enable = batadv_iv_ogm_iface_enable,
1317 .bat_iface_disable = batadv_iv_ogm_iface_disable,
1318 .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
1319 .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
1320 .bat_ogm_schedule = batadv_iv_ogm_schedule,
1321 .bat_ogm_emit = batadv_iv_ogm_emit,
1322 };
1323
1324 int __init batadv_iv_init(void)
1325 {
1326 int ret;
1327
1328 /* batman originator packet */
1329 ret = batadv_recv_handler_register(BATADV_IV_OGM,
1330 batadv_iv_ogm_receive);
1331 if (ret < 0)
1332 goto out;
1333
1334 ret = batadv_algo_register(&batadv_batman_iv);
1335 if (ret < 0)
1336 goto handler_unregister;
1337
1338 goto out;
1339
1340 handler_unregister:
1341 batadv_recv_handler_unregister(BATADV_IV_OGM);
1342 out:
1343 return ret;
1344 }
Linus' kernel tree