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m68knommu: use "r", not "i" constraint in cacheflush asm's
[linux-2.6/cjktty.git] / net / batman-adv / bat_iv_ogm.c
blobe877af8bdd1e8551335ec810ea1ad2c32bedc64e
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 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 batadv_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 batadv_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
106 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
107 {
108 struct batadv_ogm_packet *batadv_ogm_packet;
109
110 batadv_ogm_packet = (struct batadv_ogm_packet *)hard_iface->packet_buff;
111 batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP;
112 batadv_ogm_packet->header.ttl = BATADV_TTL;
113 }
114
115 /* when do we schedule our own ogm to be sent */
116 static unsigned long
117 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
118 {
119 unsigned int msecs;
120
121 msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
122 msecs += (random32() % 2 * BATADV_JITTER);
123
124 return jiffies + msecs_to_jiffies(msecs);
125 }
126
127 /* when do we schedule a ogm packet to be sent */
128 static unsigned long batadv_iv_ogm_fwd_send_time(void)
129 {
130 return jiffies + msecs_to_jiffies(random32() % (BATADV_JITTER / 2));
131 }
132
133 /* apply hop penalty for a normal link */
134 static uint8_t batadv_hop_penalty(uint8_t tq,
135 const struct batadv_priv *bat_priv)
136 {
137 int hop_penalty = atomic_read(&bat_priv->hop_penalty);
138 int new_tq;
139
140 new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
141 new_tq /= BATADV_TQ_MAX_VALUE;
142
143 return new_tq;
144 }
145
146 /* is there another aggregated packet here? */
147 static int batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
148 int tt_num_changes)
149 {
150 int next_buff_pos = 0;
151
152 next_buff_pos += buff_pos + BATADV_OGM_HLEN;
153 next_buff_pos += batadv_tt_len(tt_num_changes);
154
155 return (next_buff_pos <= packet_len) &&
156 (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
157 }
158
159 /* send a batman ogm to a given interface */
160 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
161 struct batadv_hard_iface *hard_iface)
162 {
163 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
164 char *fwd_str;
165 uint8_t packet_num;
166 int16_t buff_pos;
167 struct batadv_ogm_packet *batadv_ogm_packet;
168 struct sk_buff *skb;
169
170 if (hard_iface->if_status != BATADV_IF_ACTIVE)
171 return;
172
173 packet_num = 0;
174 buff_pos = 0;
175 batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
176
177 /* adjust all flags and log packets */
178 while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
179 batadv_ogm_packet->tt_num_changes)) {
180
181 /* we might have aggregated direct link packets with an
182 * ordinary base packet
183 */
184 if ((forw_packet->direct_link_flags & (1 << packet_num)) &&
185 (forw_packet->if_incoming == hard_iface))
186 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
187 else
188 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
189
190 fwd_str = (packet_num > 0 ? "Forwarding" : (forw_packet->own ?
191 "Sending own" :
192 "Forwarding"));
193 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
194 "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n",
195 fwd_str, (packet_num > 0 ? "aggregated " : ""),
196 batadv_ogm_packet->orig,
197 ntohl(batadv_ogm_packet->seqno),
198 batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl,
199 (batadv_ogm_packet->flags & BATADV_DIRECTLINK ?
200 "on" : "off"),
201 batadv_ogm_packet->ttvn, hard_iface->net_dev->name,
202 hard_iface->net_dev->dev_addr);
203
204 buff_pos += BATADV_OGM_HLEN;
205 buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes);
206 packet_num++;
207 batadv_ogm_packet = (struct batadv_ogm_packet *)
208 (forw_packet->skb->data + buff_pos);
209 }
210
211 /* create clone because function is called more than once */
212 skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
213 if (skb) {
214 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
215 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
216 skb->len + ETH_HLEN);
217 batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr);
218 }
219 }
220
221 /* send a batman ogm packet */
222 static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
223 {
224 struct batadv_hard_iface *hard_iface;
225 struct net_device *soft_iface;
226 struct batadv_priv *bat_priv;
227 struct batadv_hard_iface *primary_if = NULL;
228 struct batadv_ogm_packet *batadv_ogm_packet;
229 unsigned char directlink;
230
231 batadv_ogm_packet = (struct batadv_ogm_packet *)
232 (forw_packet->skb->data);
233 directlink = (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0);
234
235 if (!forw_packet->if_incoming) {
236 pr_err("Error - can't forward packet: incoming iface not specified\n");
237 goto out;
238 }
239
240 soft_iface = forw_packet->if_incoming->soft_iface;
241 bat_priv = netdev_priv(soft_iface);
242
243 if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
244 goto out;
245
246 primary_if = batadv_primary_if_get_selected(bat_priv);
247 if (!primary_if)
248 goto out;
249
250 /* multihomed peer assumed
251 * non-primary OGMs are only broadcasted on their interface
252 */
253 if ((directlink && (batadv_ogm_packet->header.ttl == 1)) ||
254 (forw_packet->own && (forw_packet->if_incoming != primary_if))) {
255
256 /* FIXME: what about aggregated packets ? */
257 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
258 "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n",
259 (forw_packet->own ? "Sending own" : "Forwarding"),
260 batadv_ogm_packet->orig,
261 ntohl(batadv_ogm_packet->seqno),
262 batadv_ogm_packet->header.ttl,
263 forw_packet->if_incoming->net_dev->name,
264 forw_packet->if_incoming->net_dev->dev_addr);
265
266 /* skb is only used once and than forw_packet is free'd */
267 batadv_send_skb_packet(forw_packet->skb,
268 forw_packet->if_incoming,
269 batadv_broadcast_addr);
270 forw_packet->skb = NULL;
271
272 goto out;
273 }
274
275 /* broadcast on every interface */
276 rcu_read_lock();
277 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
278 if (hard_iface->soft_iface != soft_iface)
279 continue;
280
281 batadv_iv_ogm_send_to_if(forw_packet, hard_iface);
282 }
283 rcu_read_unlock();
284
285 out:
286 if (primary_if)
287 batadv_hardif_free_ref(primary_if);
288 }
289
290 /* return true if new_packet can be aggregated with forw_packet */
291 static bool
292 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
293 struct batadv_priv *bat_priv,
294 int packet_len, unsigned long send_time,
295 bool directlink,
296 const struct batadv_hard_iface *if_incoming,
297 const struct batadv_forw_packet *forw_packet)
298 {
299 struct batadv_ogm_packet *batadv_ogm_packet;
300 int aggregated_bytes = forw_packet->packet_len + packet_len;
301 struct batadv_hard_iface *primary_if = NULL;
302 bool res = false;
303 unsigned long aggregation_end_time;
304
305 batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
306 aggregation_end_time = send_time;
307 aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
308
309 /* we can aggregate the current packet to this aggregated packet
310 * if:
311 *
312 * - the send time is within our MAX_AGGREGATION_MS time
313 * - the resulting packet wont be bigger than
314 * MAX_AGGREGATION_BYTES
315 */
316 if (time_before(send_time, forw_packet->send_time) &&
317 time_after_eq(aggregation_end_time, forw_packet->send_time) &&
318 (aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) {
319
320 /* check aggregation compatibility
321 * -> direct link packets are broadcasted on
322 * their interface only
323 * -> aggregate packet if the current packet is
324 * a "global" packet as well as the base
325 * packet
326 */
327 primary_if = batadv_primary_if_get_selected(bat_priv);
328 if (!primary_if)
329 goto out;
330
331 /* packets without direct link flag and high TTL
332 * are flooded through the net
333 */
334 if ((!directlink) &&
335 (!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) &&
336 (batadv_ogm_packet->header.ttl != 1) &&
337
338 /* own packets originating non-primary
339 * interfaces leave only that interface
340 */
341 ((!forw_packet->own) ||
342 (forw_packet->if_incoming == primary_if))) {
343 res = true;
344 goto out;
345 }
346
347 /* if the incoming packet is sent via this one
348 * interface only - we still can aggregate
349 */
350 if ((directlink) &&
351 (new_bat_ogm_packet->header.ttl == 1) &&
352 (forw_packet->if_incoming == if_incoming) &&
353
354 /* packets from direct neighbors or
355 * own secondary interface packets
356 * (= secondary interface packets in general)
357 */
358 (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
359 (forw_packet->own &&
360 forw_packet->if_incoming != primary_if))) {
361 res = true;
362 goto out;
363 }
364 }
365
366 out:
367 if (primary_if)
368 batadv_hardif_free_ref(primary_if);
369 return res;
370 }
371
372 /* create a new aggregated packet and add this packet to it */
373 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
374 int packet_len, unsigned long send_time,
375 bool direct_link,
376 struct batadv_hard_iface *if_incoming,
377 int own_packet)
378 {
379 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
380 struct batadv_forw_packet *forw_packet_aggr;
381 unsigned char *skb_buff;
382 unsigned int skb_size;
383
384 if (!atomic_inc_not_zero(&if_incoming->refcount))
385 return;
386
387 /* own packet should always be scheduled */
388 if (!own_packet) {
389 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
390 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
391 "batman packet queue full\n");
392 goto out;
393 }
394 }
395
396 forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
397 if (!forw_packet_aggr) {
398 if (!own_packet)
399 atomic_inc(&bat_priv->batman_queue_left);
400 goto out;
401 }
402
403 if ((atomic_read(&bat_priv->aggregated_ogms)) &&
404 (packet_len < BATADV_MAX_AGGREGATION_BYTES))
405 skb_size = BATADV_MAX_AGGREGATION_BYTES + ETH_HLEN;
406 else
407 skb_size = packet_len + ETH_HLEN;
408
409 forw_packet_aggr->skb = dev_alloc_skb(skb_size);
410 if (!forw_packet_aggr->skb) {
411 if (!own_packet)
412 atomic_inc(&bat_priv->batman_queue_left);
413 kfree(forw_packet_aggr);
414 goto out;
415 }
416 skb_reserve(forw_packet_aggr->skb, ETH_HLEN);
417
418 INIT_HLIST_NODE(&forw_packet_aggr->list);
419
420 skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
421 forw_packet_aggr->packet_len = packet_len;
422 memcpy(skb_buff, packet_buff, packet_len);
423
424 forw_packet_aggr->own = own_packet;
425 forw_packet_aggr->if_incoming = if_incoming;
426 forw_packet_aggr->num_packets = 0;
427 forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
428 forw_packet_aggr->send_time = send_time;
429
430 /* save packet direct link flag status */
431 if (direct_link)
432 forw_packet_aggr->direct_link_flags |= 1;
433
434 /* add new packet to packet list */
435 spin_lock_bh(&bat_priv->forw_bat_list_lock);
436 hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
437 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
438
439 /* start timer for this packet */
440 INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
441 batadv_send_outstanding_bat_ogm_packet);
442 queue_delayed_work(batadv_event_workqueue,
443 &forw_packet_aggr->delayed_work,
444 send_time - jiffies);
445
446 return;
447 out:
448 batadv_hardif_free_ref(if_incoming);
449 }
450
451 /* aggregate a new packet into the existing ogm packet */
452 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
453 const unsigned char *packet_buff,
454 int packet_len, bool direct_link)
455 {
456 unsigned char *skb_buff;
457
458 skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
459 memcpy(skb_buff, packet_buff, packet_len);
460 forw_packet_aggr->packet_len += packet_len;
461 forw_packet_aggr->num_packets++;
462
463 /* save packet direct link flag status */
464 if (direct_link)
465 forw_packet_aggr->direct_link_flags |=
466 (1 << forw_packet_aggr->num_packets);
467 }
468
469 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
470 unsigned char *packet_buff,
471 int packet_len,
472 struct batadv_hard_iface *if_incoming,
473 int own_packet, unsigned long send_time)
474 {
475 /* _aggr -> pointer to the packet we want to aggregate with
476 * _pos -> pointer to the position in the queue
477 */
478 struct batadv_forw_packet *forw_packet_aggr = NULL;
479 struct batadv_forw_packet *forw_packet_pos = NULL;
480 struct hlist_node *tmp_node;
481 struct batadv_ogm_packet *batadv_ogm_packet;
482 bool direct_link;
483 unsigned long max_aggregation_jiffies;
484
485 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
486 direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0;
487 max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
488
489 /* find position for the packet in the forward queue */
490 spin_lock_bh(&bat_priv->forw_bat_list_lock);
491 /* own packets are not to be aggregated */
492 if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
493 hlist_for_each_entry(forw_packet_pos, tmp_node,
494 &bat_priv->forw_bat_list, list) {
495 if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
496 bat_priv, packet_len,
497 send_time, direct_link,
498 if_incoming,
499 forw_packet_pos)) {
500 forw_packet_aggr = forw_packet_pos;
501 break;
502 }
503 }
504 }
505
506 /* nothing to aggregate with - either aggregation disabled or no
507 * suitable aggregation packet found
508 */
509 if (!forw_packet_aggr) {
510 /* the following section can run without the lock */
511 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
512
513 /* if we could not aggregate this packet with one of the others
514 * we hold it back for a while, so that it might be aggregated
515 * later on
516 */
517 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
518 send_time += max_aggregation_jiffies;
519
520 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
521 send_time, direct_link,
522 if_incoming, own_packet);
523 } else {
524 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
525 packet_len, direct_link);
526 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
527 }
528 }
529
530 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
531 const struct ethhdr *ethhdr,
532 struct batadv_ogm_packet *batadv_ogm_packet,
533 bool is_single_hop_neigh,
534 bool is_from_best_next_hop,
535 struct batadv_hard_iface *if_incoming)
536 {
537 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
538 uint8_t tt_num_changes;
539
540 if (batadv_ogm_packet->header.ttl <= 1) {
541 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
542 return;
543 }
544
545 if (!is_from_best_next_hop) {
546 /* Mark the forwarded packet when it is not coming from our
547 * best next hop. We still need to forward the packet for our
548 * neighbor link quality detection to work in case the packet
549 * originated from a single hop neighbor. Otherwise we can
550 * simply drop the ogm.
551 */
552 if (is_single_hop_neigh)
553 batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
554 else
555 return;
556 }
557
558 tt_num_changes = batadv_ogm_packet->tt_num_changes;
559
560 batadv_ogm_packet->header.ttl--;
561 memcpy(batadv_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
562
563 /* apply hop penalty */
564 batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
565 bat_priv);
566
567 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
568 "Forwarding packet: tq: %i, ttl: %i\n",
569 batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl);
570
571 /* switch of primaries first hop flag when forwarding */
572 batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP;
573 if (is_single_hop_neigh)
574 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
575 else
576 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
577
578 batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
579 BATADV_OGM_HLEN + batadv_tt_len(tt_num_changes),
580 if_incoming, 0, batadv_iv_ogm_fwd_send_time());
581 }
582
583 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
584 {
585 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
586 struct batadv_ogm_packet *batadv_ogm_packet;
587 struct batadv_hard_iface *primary_if;
588 int vis_server, tt_num_changes = 0;
589
590 vis_server = atomic_read(&bat_priv->vis_mode);
591 primary_if = batadv_primary_if_get_selected(bat_priv);
592
593 if (hard_iface == primary_if)
594 tt_num_changes = batadv_tt_append_diff(bat_priv,
595 &hard_iface->packet_buff,
596 &hard_iface->packet_len,
597 BATADV_OGM_HLEN);
598
599 batadv_ogm_packet = (struct batadv_ogm_packet *)hard_iface->packet_buff;
600
601 /* change sequence number to network order */
602 batadv_ogm_packet->seqno =
603 htonl((uint32_t)atomic_read(&hard_iface->seqno));
604 atomic_inc(&hard_iface->seqno);
605
606 batadv_ogm_packet->ttvn = atomic_read(&bat_priv->ttvn);
607 batadv_ogm_packet->tt_crc = htons(bat_priv->tt_crc);
608 if (tt_num_changes >= 0)
609 batadv_ogm_packet->tt_num_changes = tt_num_changes;
610
611 if (vis_server == BATADV_VIS_TYPE_SERVER_SYNC)
612 batadv_ogm_packet->flags |= BATADV_VIS_SERVER;
613 else
614 batadv_ogm_packet->flags &= ~BATADV_VIS_SERVER;
615
616 if ((hard_iface == primary_if) &&
617 (atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_SERVER))
618 batadv_ogm_packet->gw_flags =
619 (uint8_t)atomic_read(&bat_priv->gw_bandwidth);
620 else
621 batadv_ogm_packet->gw_flags = BATADV_NO_FLAGS;
622
623 batadv_slide_own_bcast_window(hard_iface);
624 batadv_iv_ogm_queue_add(bat_priv, hard_iface->packet_buff,
625 hard_iface->packet_len, hard_iface, 1,
626 batadv_iv_ogm_emit_send_time(bat_priv));
627
628 if (primary_if)
629 batadv_hardif_free_ref(primary_if);
630 }
631
632 static void
633 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
634 struct batadv_orig_node *orig_node,
635 const struct ethhdr *ethhdr,
636 const struct batadv_ogm_packet *batadv_ogm_packet,
637 struct batadv_hard_iface *if_incoming,
638 const unsigned char *tt_buff,
639 int is_duplicate)
640 {
641 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
642 struct batadv_neigh_node *router = NULL;
643 struct batadv_orig_node *orig_node_tmp;
644 struct hlist_node *node;
645 uint8_t bcast_own_sum_orig, bcast_own_sum_neigh;
646 uint8_t *neigh_addr;
647
648 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
649 "update_originator(): Searching and updating originator entry of received packet\n");
650
651 rcu_read_lock();
652 hlist_for_each_entry_rcu(tmp_neigh_node, node,
653 &orig_node->neigh_list, list) {
654 neigh_addr = tmp_neigh_node->addr;
655 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
656 tmp_neigh_node->if_incoming == if_incoming &&
657 atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
658 if (neigh_node)
659 batadv_neigh_node_free_ref(neigh_node);
660 neigh_node = tmp_neigh_node;
661 continue;
662 }
663
664 if (is_duplicate)
665 continue;
666
667 spin_lock_bh(&tmp_neigh_node->lq_update_lock);
668 batadv_ring_buffer_set(tmp_neigh_node->tq_recv,
669 &tmp_neigh_node->tq_index, 0);
670 tmp_neigh_node->tq_avg =
671 batadv_ring_buffer_avg(tmp_neigh_node->tq_recv);
672 spin_unlock_bh(&tmp_neigh_node->lq_update_lock);
673 }
674
675 if (!neigh_node) {
676 struct batadv_orig_node *orig_tmp;
677
678 orig_tmp = batadv_get_orig_node(bat_priv, ethhdr->h_source);
679 if (!orig_tmp)
680 goto unlock;
681
682 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
683 ethhdr->h_source,
684 orig_node, orig_tmp,
685 batadv_ogm_packet->seqno);
686
687 batadv_orig_node_free_ref(orig_tmp);
688 if (!neigh_node)
689 goto unlock;
690 } else
691 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
692 "Updating existing last-hop neighbor of originator\n");
693
694 rcu_read_unlock();
695
696 orig_node->flags = batadv_ogm_packet->flags;
697 neigh_node->last_seen = jiffies;
698
699 spin_lock_bh(&neigh_node->lq_update_lock);
700 batadv_ring_buffer_set(neigh_node->tq_recv,
701 &neigh_node->tq_index,
702 batadv_ogm_packet->tq);
703 neigh_node->tq_avg = batadv_ring_buffer_avg(neigh_node->tq_recv);
704 spin_unlock_bh(&neigh_node->lq_update_lock);
705
706 if (!is_duplicate) {
707 orig_node->last_ttl = batadv_ogm_packet->header.ttl;
708 neigh_node->last_ttl = batadv_ogm_packet->header.ttl;
709 }
710
711 batadv_bonding_candidate_add(orig_node, neigh_node);
712
713 /* if this neighbor already is our next hop there is nothing
714 * to change
715 */
716 router = batadv_orig_node_get_router(orig_node);
717 if (router == neigh_node)
718 goto update_tt;
719
720 /* if this neighbor does not offer a better TQ we won't consider it */
721 if (router && (router->tq_avg > neigh_node->tq_avg))
722 goto update_tt;
723
724 /* if the TQ is the same and the link not more symmetric we
725 * won't consider it either
726 */
727 if (router && (neigh_node->tq_avg == router->tq_avg)) {
728 orig_node_tmp = router->orig_node;
729 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
730 bcast_own_sum_orig =
731 orig_node_tmp->bcast_own_sum[if_incoming->if_num];
732 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
733
734 orig_node_tmp = neigh_node->orig_node;
735 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
736 bcast_own_sum_neigh =
737 orig_node_tmp->bcast_own_sum[if_incoming->if_num];
738 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
739
740 if (bcast_own_sum_orig >= bcast_own_sum_neigh)
741 goto update_tt;
742 }
743
744 batadv_update_route(bat_priv, orig_node, neigh_node);
745
746 update_tt:
747 /* I have to check for transtable changes only if the OGM has been
748 * sent through a primary interface
749 */
750 if (((batadv_ogm_packet->orig != ethhdr->h_source) &&
751 (batadv_ogm_packet->header.ttl > 2)) ||
752 (batadv_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP))
753 batadv_tt_update_orig(bat_priv, orig_node, tt_buff,
754 batadv_ogm_packet->tt_num_changes,
755 batadv_ogm_packet->ttvn,
756 ntohs(batadv_ogm_packet->tt_crc));
757
758 if (orig_node->gw_flags != batadv_ogm_packet->gw_flags)
759 batadv_gw_node_update(bat_priv, orig_node,
760 batadv_ogm_packet->gw_flags);
761
762 orig_node->gw_flags = batadv_ogm_packet->gw_flags;
763
764 /* restart gateway selection if fast or late switching was enabled */
765 if ((orig_node->gw_flags) &&
766 (atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_CLIENT) &&
767 (atomic_read(&bat_priv->gw_sel_class) > 2))
768 batadv_gw_check_election(bat_priv, orig_node);
769
770 goto out;
771
772 unlock:
773 rcu_read_unlock();
774 out:
775 if (neigh_node)
776 batadv_neigh_node_free_ref(neigh_node);
777 if (router)
778 batadv_neigh_node_free_ref(router);
779 }
780
781 static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
782 struct batadv_orig_node *orig_neigh_node,
783 struct batadv_ogm_packet *batadv_ogm_packet,
784 struct batadv_hard_iface *if_incoming)
785 {
786 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
787 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
788 struct hlist_node *node;
789 uint8_t total_count;
790 uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
791 unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
792 int tq_asym_penalty, inv_asym_penalty, ret = 0;
793 unsigned int combined_tq;
794
795 /* find corresponding one hop neighbor */
796 rcu_read_lock();
797 hlist_for_each_entry_rcu(tmp_neigh_node, node,
798 &orig_neigh_node->neigh_list, list) {
799
800 if (!batadv_compare_eth(tmp_neigh_node->addr,
801 orig_neigh_node->orig))
802 continue;
803
804 if (tmp_neigh_node->if_incoming != if_incoming)
805 continue;
806
807 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
808 continue;
809
810 neigh_node = tmp_neigh_node;
811 break;
812 }
813 rcu_read_unlock();
814
815 if (!neigh_node)
816 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
817 orig_neigh_node->orig,
818 orig_neigh_node,
819 orig_neigh_node,
820 batadv_ogm_packet->seqno);
821
822 if (!neigh_node)
823 goto out;
824
825 /* if orig_node is direct neighbor update neigh_node last_seen */
826 if (orig_node == orig_neigh_node)
827 neigh_node->last_seen = jiffies;
828
829 orig_node->last_seen = jiffies;
830
831 /* find packet count of corresponding one hop neighbor */
832 spin_lock_bh(&orig_node->ogm_cnt_lock);
833 orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];
834 neigh_rq_count = neigh_node->real_packet_count;
835 spin_unlock_bh(&orig_node->ogm_cnt_lock);
836
837 /* pay attention to not get a value bigger than 100 % */
838 total_count = (orig_eq_count > neigh_rq_count ?
839 neigh_rq_count : orig_eq_count);
840
841 /* if we have too few packets (too less data) we set tq_own to zero
842 * if we receive too few packets it is not considered bidirectional
843 */
844 if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
845 neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
846 tq_own = 0;
847 else
848 /* neigh_node->real_packet_count is never zero as we
849 * only purge old information when getting new
850 * information
851 */
852 tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count;
853
854 /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
855 * affect the nearly-symmetric links only a little, but
856 * punishes asymmetric links more. This will give a value
857 * between 0 and TQ_MAX_VALUE
858 */
859 neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
860 neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
861 neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
862 BATADV_TQ_LOCAL_WINDOW_SIZE *
863 BATADV_TQ_LOCAL_WINDOW_SIZE;
864 inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
865 inv_asym_penalty /= neigh_rq_max_cube;
866 tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
867
868 combined_tq = batadv_ogm_packet->tq * tq_own * tq_asym_penalty;
869 combined_tq /= BATADV_TQ_MAX_VALUE * BATADV_TQ_MAX_VALUE;
870 batadv_ogm_packet->tq = combined_tq;
871
872 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
873 "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n",
874 orig_node->orig, orig_neigh_node->orig, total_count,
875 neigh_rq_count, tq_own,
876 tq_asym_penalty, batadv_ogm_packet->tq);
877
878 /* if link has the minimum required transmission quality
879 * consider it bidirectional
880 */
881 if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
882 ret = 1;
883
884 out:
885 if (neigh_node)
886 batadv_neigh_node_free_ref(neigh_node);
887 return ret;
888 }
889
890 /* processes a batman packet for all interfaces, adjusts the sequence number and
891 * finds out whether it is a duplicate.
892 * returns:
893 * 1 the packet is a duplicate
894 * 0 the packet has not yet been received
895 * -1 the packet is old and has been received while the seqno window
896 * was protected. Caller should drop it.
897 */
898 static int
899 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
900 const struct batadv_ogm_packet *batadv_ogm_packet,
901 const struct batadv_hard_iface *if_incoming)
902 {
903 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
904 struct batadv_orig_node *orig_node;
905 struct batadv_neigh_node *tmp_neigh_node;
906 struct hlist_node *node;
907 int is_duplicate = 0;
908 int32_t seq_diff;
909 int need_update = 0;
910 int set_mark, ret = -1;
911 uint32_t seqno = ntohl(batadv_ogm_packet->seqno);
912 uint8_t *neigh_addr;
913
914 orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig);
915 if (!orig_node)
916 return 0;
917
918 spin_lock_bh(&orig_node->ogm_cnt_lock);
919 seq_diff = seqno - orig_node->last_real_seqno;
920
921 /* signalize caller that the packet is to be dropped. */
922 if (!hlist_empty(&orig_node->neigh_list) &&
923 batadv_window_protected(bat_priv, seq_diff,
924 &orig_node->batman_seqno_reset))
925 goto out;
926
927 rcu_read_lock();
928 hlist_for_each_entry_rcu(tmp_neigh_node, node,
929 &orig_node->neigh_list, list) {
930
931 is_duplicate |= batadv_test_bit(tmp_neigh_node->real_bits,
932 orig_node->last_real_seqno,
933 seqno);
934
935 neigh_addr = tmp_neigh_node->addr;
936 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
937 tmp_neigh_node->if_incoming == if_incoming)
938 set_mark = 1;
939 else
940 set_mark = 0;
941
942 /* if the window moved, set the update flag. */
943 need_update |= batadv_bit_get_packet(bat_priv,
944 tmp_neigh_node->real_bits,
945 seq_diff, set_mark);
946
947 tmp_neigh_node->real_packet_count =
948 bitmap_weight(tmp_neigh_node->real_bits,
949 BATADV_TQ_LOCAL_WINDOW_SIZE);
950 }
951 rcu_read_unlock();
952
953 if (need_update) {
954 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
955 "updating last_seqno: old %u, new %u\n",
956 orig_node->last_real_seqno, seqno);
957 orig_node->last_real_seqno = seqno;
958 }
959
960 ret = is_duplicate;
961
962 out:
963 spin_unlock_bh(&orig_node->ogm_cnt_lock);
964 batadv_orig_node_free_ref(orig_node);
965 return ret;
966 }
967
968 static void batadv_iv_ogm_process(const struct ethhdr *ethhdr,
969 struct batadv_ogm_packet *batadv_ogm_packet,
970 const unsigned char *tt_buff,
971 struct batadv_hard_iface *if_incoming)
972 {
973 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
974 struct batadv_hard_iface *hard_iface;
975 struct batadv_orig_node *orig_neigh_node, *orig_node;
976 struct batadv_neigh_node *router = NULL, *router_router = NULL;
977 struct batadv_neigh_node *orig_neigh_router = NULL;
978 int has_directlink_flag;
979 int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
980 int is_broadcast = 0, is_bidirect;
981 bool is_single_hop_neigh = false;
982 bool is_from_best_next_hop = false;
983 int is_duplicate, sameseq, simlar_ttl;
984 uint32_t if_incoming_seqno;
985 uint8_t *prev_sender;
986
987 /* Silently drop when the batman packet is actually not a
988 * correct packet.
989 *
990 * This might happen if a packet is padded (e.g. Ethernet has a
991 * minimum frame length of 64 byte) and the aggregation interprets
992 * it as an additional length.
993 *
994 * TODO: A more sane solution would be to have a bit in the
995 * batadv_ogm_packet to detect whether the packet is the last
996 * packet in an aggregation. Here we expect that the padding
997 * is always zero (or not 0x01)
998 */
999 if (batadv_ogm_packet->header.packet_type != BATADV_IV_OGM)
1000 return;
1001
1002 /* could be changed by schedule_own_packet() */
1003 if_incoming_seqno = atomic_read(&if_incoming->seqno);
1004
1005 if (batadv_ogm_packet->flags & BATADV_DIRECTLINK)
1006 has_directlink_flag = 1;
1007 else
1008 has_directlink_flag = 0;
1009
1010 if (batadv_compare_eth(ethhdr->h_source, batadv_ogm_packet->orig))
1011 is_single_hop_neigh = true;
1012
1013 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1014 "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",
1015 ethhdr->h_source, if_incoming->net_dev->name,
1016 if_incoming->net_dev->dev_addr, batadv_ogm_packet->orig,
1017 batadv_ogm_packet->prev_sender,
1018 ntohl(batadv_ogm_packet->seqno), batadv_ogm_packet->ttvn,
1019 ntohs(batadv_ogm_packet->tt_crc),
1020 batadv_ogm_packet->tt_num_changes, batadv_ogm_packet->tq,
1021 batadv_ogm_packet->header.ttl,
1022 batadv_ogm_packet->header.version, has_directlink_flag);
1023
1024 rcu_read_lock();
1025 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1026 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1027 continue;
1028
1029 if (hard_iface->soft_iface != if_incoming->soft_iface)
1030 continue;
1031
1032 if (batadv_compare_eth(ethhdr->h_source,
1033 hard_iface->net_dev->dev_addr))
1034 is_my_addr = 1;
1035
1036 if (batadv_compare_eth(batadv_ogm_packet->orig,
1037 hard_iface->net_dev->dev_addr))
1038 is_my_orig = 1;
1039
1040 if (batadv_compare_eth(batadv_ogm_packet->prev_sender,
1041 hard_iface->net_dev->dev_addr))
1042 is_my_oldorig = 1;
1043
1044 if (is_broadcast_ether_addr(ethhdr->h_source))
1045 is_broadcast = 1;
1046 }
1047 rcu_read_unlock();
1048
1049 if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) {
1050 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1051 "Drop packet: incompatible batman version (%i)\n",
1052 batadv_ogm_packet->header.version);
1053 return;
1054 }
1055
1056 if (is_my_addr) {
1057 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1058 "Drop packet: received my own broadcast (sender: %pM)\n",
1059 ethhdr->h_source);
1060 return;
1061 }
1062
1063 if (is_broadcast) {
1064 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1065 "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n",
1066 ethhdr->h_source);
1067 return;
1068 }
1069
1070 if (is_my_orig) {
1071 unsigned long *word;
1072 int offset;
1073 int32_t bit_pos;
1074 int16_t if_num;
1075 uint8_t *weight;
1076
1077 orig_neigh_node = batadv_get_orig_node(bat_priv,
1078 ethhdr->h_source);
1079 if (!orig_neigh_node)
1080 return;
1081
1082 /* neighbor has to indicate direct link and it has to
1083 * come via the corresponding interface
1084 * save packet seqno for bidirectional check
1085 */
1086 if (has_directlink_flag &&
1087 batadv_compare_eth(if_incoming->net_dev->dev_addr,
1088 batadv_ogm_packet->orig)) {
1089 if_num = if_incoming->if_num;
1090 offset = if_num * BATADV_NUM_WORDS;
1091
1092 spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
1093 word = &(orig_neigh_node->bcast_own[offset]);
1094 bit_pos = if_incoming_seqno - 2;
1095 bit_pos -= ntohl(batadv_ogm_packet->seqno);
1096 batadv_set_bit(word, bit_pos);
1097 weight = &orig_neigh_node->bcast_own_sum[if_num];
1098 *weight = bitmap_weight(word,
1099 BATADV_TQ_LOCAL_WINDOW_SIZE);
1100 spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
1101 }
1102
1103 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1104 "Drop packet: originator packet from myself (via neighbor)\n");
1105 batadv_orig_node_free_ref(orig_neigh_node);
1106 return;
1107 }
1108
1109 if (is_my_oldorig) {
1110 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1111 "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1112 ethhdr->h_source);
1113 return;
1114 }
1115
1116 if (batadv_ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
1117 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1118 "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1119 ethhdr->h_source);
1120 return;
1121 }
1122
1123 orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig);
1124 if (!orig_node)
1125 return;
1126
1127 is_duplicate = batadv_iv_ogm_update_seqnos(ethhdr, batadv_ogm_packet,
1128 if_incoming);
1129
1130 if (is_duplicate == -1) {
1131 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1132 "Drop packet: packet within seqno protection time (sender: %pM)\n",
1133 ethhdr->h_source);
1134 goto out;
1135 }
1136
1137 if (batadv_ogm_packet->tq == 0) {
1138 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1139 "Drop packet: originator packet with tq equal 0\n");
1140 goto out;
1141 }
1142
1143 router = batadv_orig_node_get_router(orig_node);
1144 if (router)
1145 router_router = batadv_orig_node_get_router(router->orig_node);
1146
1147 if ((router && router->tq_avg != 0) &&
1148 (batadv_compare_eth(router->addr, ethhdr->h_source)))
1149 is_from_best_next_hop = true;
1150
1151 prev_sender = batadv_ogm_packet->prev_sender;
1152 /* avoid temporary routing loops */
1153 if (router && router_router &&
1154 (batadv_compare_eth(router->addr, prev_sender)) &&
1155 !(batadv_compare_eth(batadv_ogm_packet->orig, prev_sender)) &&
1156 (batadv_compare_eth(router->addr, router_router->addr))) {
1157 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1158 "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1159 ethhdr->h_source);
1160 goto out;
1161 }
1162
1163 /* if sender is a direct neighbor the sender mac equals
1164 * originator mac
1165 */
1166 orig_neigh_node = (is_single_hop_neigh ?
1167 orig_node :
1168 batadv_get_orig_node(bat_priv, ethhdr->h_source));
1169 if (!orig_neigh_node)
1170 goto out;
1171
1172 orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node);
1173
1174 /* drop packet if sender is not a direct neighbor and if we
1175 * don't route towards it
1176 */
1177 if (!is_single_hop_neigh && (!orig_neigh_router)) {
1178 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1179 "Drop packet: OGM via unknown neighbor!\n");
1180 goto out_neigh;
1181 }
1182
1183 is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1184 batadv_ogm_packet, if_incoming);
1185
1186 batadv_bonding_save_primary(orig_node, orig_neigh_node,
1187 batadv_ogm_packet);
1188
1189 /* update ranking if it is not a duplicate or has the same
1190 * seqno and similar ttl as the non-duplicate
1191 */
1192 sameseq = orig_node->last_real_seqno == ntohl(batadv_ogm_packet->seqno);
1193 simlar_ttl = orig_node->last_ttl - 3 <= batadv_ogm_packet->header.ttl;
1194 if (is_bidirect && (!is_duplicate || (sameseq && simlar_ttl)))
1195 batadv_iv_ogm_orig_update(bat_priv, orig_node, ethhdr,
1196 batadv_ogm_packet, if_incoming,
1197 tt_buff, is_duplicate);
1198
1199 /* is single hop (direct) neighbor */
1200 if (is_single_hop_neigh) {
1201
1202 /* mark direct link on incoming interface */
1203 batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
1204 is_single_hop_neigh,
1205 is_from_best_next_hop, if_incoming);
1206
1207 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1208 "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1209 goto out_neigh;
1210 }
1211
1212 /* multihop originator */
1213 if (!is_bidirect) {
1214 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1215 "Drop packet: not received via bidirectional link\n");
1216 goto out_neigh;
1217 }
1218
1219 if (is_duplicate) {
1220 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1221 "Drop packet: duplicate packet received\n");
1222 goto out_neigh;
1223 }
1224
1225 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1226 "Forwarding packet: rebroadcast originator packet\n");
1227 batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
1228 is_single_hop_neigh, is_from_best_next_hop,
1229 if_incoming);
1230
1231 out_neigh:
1232 if ((orig_neigh_node) && (!is_single_hop_neigh))
1233 batadv_orig_node_free_ref(orig_neigh_node);
1234 out:
1235 if (router)
1236 batadv_neigh_node_free_ref(router);
1237 if (router_router)
1238 batadv_neigh_node_free_ref(router_router);
1239 if (orig_neigh_router)
1240 batadv_neigh_node_free_ref(orig_neigh_router);
1241
1242 batadv_orig_node_free_ref(orig_node);
1243 }
1244
1245 static int batadv_iv_ogm_receive(struct sk_buff *skb,
1246 struct batadv_hard_iface *if_incoming)
1247 {
1248 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1249 struct batadv_ogm_packet *batadv_ogm_packet;
1250 struct ethhdr *ethhdr;
1251 int buff_pos = 0, packet_len;
1252 unsigned char *tt_buff, *packet_buff;
1253 bool ret;
1254
1255 ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
1256 if (!ret)
1257 return NET_RX_DROP;
1258
1259 /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1260 * that does not have B.A.T.M.A.N. IV enabled ?
1261 */
1262 if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
1263 return NET_RX_DROP;
1264
1265 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1266 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
1267 skb->len + ETH_HLEN);
1268
1269 packet_len = skb_headlen(skb);
1270 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1271 packet_buff = skb->data;
1272 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
1273
1274 /* unpack the aggregated packets and process them one by one */
1275 do {
1276 tt_buff = packet_buff + buff_pos + BATADV_OGM_HLEN;
1277
1278 batadv_iv_ogm_process(ethhdr, batadv_ogm_packet, tt_buff,
1279 if_incoming);
1280
1281 buff_pos += BATADV_OGM_HLEN;
1282 buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes);
1283
1284 batadv_ogm_packet = (struct batadv_ogm_packet *)
1285 (packet_buff + buff_pos);
1286 } while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len,
1287 batadv_ogm_packet->tt_num_changes));
1288
1289 kfree_skb(skb);
1290 return NET_RX_SUCCESS;
1291 }
1292
1293 static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
1294 .name = "BATMAN_IV",
1295 .bat_iface_enable = batadv_iv_ogm_iface_enable,
1296 .bat_iface_disable = batadv_iv_ogm_iface_disable,
1297 .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
1298 .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
1299 .bat_ogm_schedule = batadv_iv_ogm_schedule,
1300 .bat_ogm_emit = batadv_iv_ogm_emit,
1301 };
1302
1303 int __init batadv_iv_init(void)
1304 {
1305 int ret;
1306
1307 /* batman originator packet */
1308 ret = batadv_recv_handler_register(BATADV_IV_OGM,
1309 batadv_iv_ogm_receive);
1310 if (ret < 0)
1311 goto out;
1312
1313 ret = batadv_algo_register(&batadv_batman_iv);
1314 if (ret < 0)
1315 goto handler_unregister;
1316
1317 goto out;
1318
1319 handler_unregister:
1320 batadv_recv_handler_unregister(BATADV_IV_OGM);
1321 out:
1322 return ret;
1323 }
CJK support for tty framebuffer vt