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spi-topcliff-pch: Fix issue for transmitting over 4KByte
[zen-stable.git] / net / batman-adv / bat_iv_ogm.c
blob3512e251545bae229b15a0facdc9cf0a380ceafd
1 /*
2 * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
3 *
4 * Marek Lindner, Simon Wunderlich
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of version 2 of the GNU General Public
8 * License as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA
19 *
20 */
21
22 #include "main.h"
23 #include "bat_ogm.h"
24 #include "translation-table.h"
25 #include "ring_buffer.h"
26 #include "originator.h"
27 #include "routing.h"
28 #include "gateway_common.h"
29 #include "gateway_client.h"
30 #include "hard-interface.h"
31 #include "send.h"
32
33 void bat_ogm_init(struct hard_iface *hard_iface)
34 {
35 struct batman_ogm_packet *batman_ogm_packet;
36
37 hard_iface->packet_len = BATMAN_OGM_LEN;
38 hard_iface->packet_buff = kmalloc(hard_iface->packet_len, GFP_ATOMIC);
39
40 batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
41 batman_ogm_packet->packet_type = BAT_OGM;
42 batman_ogm_packet->version = COMPAT_VERSION;
43 batman_ogm_packet->flags = NO_FLAGS;
44 batman_ogm_packet->ttl = 2;
45 batman_ogm_packet->tq = TQ_MAX_VALUE;
46 batman_ogm_packet->tt_num_changes = 0;
47 batman_ogm_packet->ttvn = 0;
48 }
49
50 void bat_ogm_init_primary(struct hard_iface *hard_iface)
51 {
52 struct batman_ogm_packet *batman_ogm_packet;
53
54 batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
55 batman_ogm_packet->flags = PRIMARIES_FIRST_HOP;
56 batman_ogm_packet->ttl = TTL;
57 }
58
59 void bat_ogm_update_mac(struct hard_iface *hard_iface)
60 {
61 struct batman_ogm_packet *batman_ogm_packet;
62
63 batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
64 memcpy(batman_ogm_packet->orig,
65 hard_iface->net_dev->dev_addr, ETH_ALEN);
66 memcpy(batman_ogm_packet->prev_sender,
67 hard_iface->net_dev->dev_addr, ETH_ALEN);
68 }
69
70 /* when do we schedule our own ogm to be sent */
71 static unsigned long bat_ogm_emit_send_time(const struct bat_priv *bat_priv)
72 {
73 return jiffies + msecs_to_jiffies(
74 atomic_read(&bat_priv->orig_interval) -
75 JITTER + (random32() % 2*JITTER));
76 }
77
78 /* when do we schedule a ogm packet to be sent */
79 static unsigned long bat_ogm_fwd_send_time(void)
80 {
81 return jiffies + msecs_to_jiffies(random32() % (JITTER/2));
82 }
83
84 /* apply hop penalty for a normal link */
85 static uint8_t hop_penalty(uint8_t tq, const struct bat_priv *bat_priv)
86 {
87 int hop_penalty = atomic_read(&bat_priv->hop_penalty);
88 return (tq * (TQ_MAX_VALUE - hop_penalty)) / (TQ_MAX_VALUE);
89 }
90
91 /* is there another aggregated packet here? */
92 static int bat_ogm_aggr_packet(int buff_pos, int packet_len,
93 int tt_num_changes)
94 {
95 int next_buff_pos = buff_pos + BATMAN_OGM_LEN + tt_len(tt_num_changes);
96
97 return (next_buff_pos <= packet_len) &&
98 (next_buff_pos <= MAX_AGGREGATION_BYTES);
99 }
100
101 /* send a batman ogm to a given interface */
102 static void bat_ogm_send_to_if(struct forw_packet *forw_packet,
103 struct hard_iface *hard_iface)
104 {
105 struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
106 char *fwd_str;
107 uint8_t packet_num;
108 int16_t buff_pos;
109 struct batman_ogm_packet *batman_ogm_packet;
110 struct sk_buff *skb;
111
112 if (hard_iface->if_status != IF_ACTIVE)
113 return;
114
115 packet_num = 0;
116 buff_pos = 0;
117 batman_ogm_packet = (struct batman_ogm_packet *)forw_packet->skb->data;
118
119 /* adjust all flags and log packets */
120 while (bat_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
121 batman_ogm_packet->tt_num_changes)) {
122
123 /* we might have aggregated direct link packets with an
124 * ordinary base packet */
125 if ((forw_packet->direct_link_flags & (1 << packet_num)) &&
126 (forw_packet->if_incoming == hard_iface))
127 batman_ogm_packet->flags |= DIRECTLINK;
128 else
129 batman_ogm_packet->flags &= ~DIRECTLINK;
130
131 fwd_str = (packet_num > 0 ? "Forwarding" : (forw_packet->own ?
132 "Sending own" :
133 "Forwarding"));
134 bat_dbg(DBG_BATMAN, bat_priv,
135 "%s %spacket (originator %pM, seqno %d, TQ %d, TTL %d,"
136 " IDF %s, ttvn %d) on interface %s [%pM]\n",
137 fwd_str, (packet_num > 0 ? "aggregated " : ""),
138 batman_ogm_packet->orig,
139 ntohl(batman_ogm_packet->seqno),
140 batman_ogm_packet->tq, batman_ogm_packet->ttl,
141 (batman_ogm_packet->flags & DIRECTLINK ?
142 "on" : "off"),
143 batman_ogm_packet->ttvn, hard_iface->net_dev->name,
144 hard_iface->net_dev->dev_addr);
145
146 buff_pos += BATMAN_OGM_LEN +
147 tt_len(batman_ogm_packet->tt_num_changes);
148 packet_num++;
149 batman_ogm_packet = (struct batman_ogm_packet *)
150 (forw_packet->skb->data + buff_pos);
151 }
152
153 /* create clone because function is called more than once */
154 skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
155 if (skb)
156 send_skb_packet(skb, hard_iface, broadcast_addr);
157 }
158
159 /* send a batman ogm packet */
160 void bat_ogm_emit(struct forw_packet *forw_packet)
161 {
162 struct hard_iface *hard_iface;
163 struct net_device *soft_iface;
164 struct bat_priv *bat_priv;
165 struct hard_iface *primary_if = NULL;
166 struct batman_ogm_packet *batman_ogm_packet;
167 unsigned char directlink;
168
169 batman_ogm_packet = (struct batman_ogm_packet *)
170 (forw_packet->skb->data);
171 directlink = (batman_ogm_packet->flags & DIRECTLINK ? 1 : 0);
172
173 if (!forw_packet->if_incoming) {
174 pr_err("Error - can't forward packet: incoming iface not "
175 "specified\n");
176 goto out;
177 }
178
179 soft_iface = forw_packet->if_incoming->soft_iface;
180 bat_priv = netdev_priv(soft_iface);
181
182 if (forw_packet->if_incoming->if_status != IF_ACTIVE)
183 goto out;
184
185 primary_if = primary_if_get_selected(bat_priv);
186 if (!primary_if)
187 goto out;
188
189 /* multihomed peer assumed */
190 /* non-primary OGMs are only broadcasted on their interface */
191 if ((directlink && (batman_ogm_packet->ttl == 1)) ||
192 (forw_packet->own && (forw_packet->if_incoming != primary_if))) {
193
194 /* FIXME: what about aggregated packets ? */
195 bat_dbg(DBG_BATMAN, bat_priv,
196 "%s packet (originator %pM, seqno %d, TTL %d) "
197 "on interface %s [%pM]\n",
198 (forw_packet->own ? "Sending own" : "Forwarding"),
199 batman_ogm_packet->orig,
200 ntohl(batman_ogm_packet->seqno),
201 batman_ogm_packet->ttl,
202 forw_packet->if_incoming->net_dev->name,
203 forw_packet->if_incoming->net_dev->dev_addr);
204
205 /* skb is only used once and than forw_packet is free'd */
206 send_skb_packet(forw_packet->skb, forw_packet->if_incoming,
207 broadcast_addr);
208 forw_packet->skb = NULL;
209
210 goto out;
211 }
212
213 /* broadcast on every interface */
214 rcu_read_lock();
215 list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
216 if (hard_iface->soft_iface != soft_iface)
217 continue;
218
219 bat_ogm_send_to_if(forw_packet, hard_iface);
220 }
221 rcu_read_unlock();
222
223 out:
224 if (primary_if)
225 hardif_free_ref(primary_if);
226 }
227
228 /* return true if new_packet can be aggregated with forw_packet */
229 static bool bat_ogm_can_aggregate(const struct batman_ogm_packet
230 *new_batman_ogm_packet,
231 struct bat_priv *bat_priv,
232 int packet_len, unsigned long send_time,
233 bool directlink,
234 const struct hard_iface *if_incoming,
235 const struct forw_packet *forw_packet)
236 {
237 struct batman_ogm_packet *batman_ogm_packet;
238 int aggregated_bytes = forw_packet->packet_len + packet_len;
239 struct hard_iface *primary_if = NULL;
240 bool res = false;
241
242 batman_ogm_packet = (struct batman_ogm_packet *)forw_packet->skb->data;
243
244 /**
245 * we can aggregate the current packet to this aggregated packet
246 * if:
247 *
248 * - the send time is within our MAX_AGGREGATION_MS time
249 * - the resulting packet wont be bigger than
250 * MAX_AGGREGATION_BYTES
251 */
252
253 if (time_before(send_time, forw_packet->send_time) &&
254 time_after_eq(send_time + msecs_to_jiffies(MAX_AGGREGATION_MS),
255 forw_packet->send_time) &&
256 (aggregated_bytes <= MAX_AGGREGATION_BYTES)) {
257
258 /**
259 * check aggregation compatibility
260 * -> direct link packets are broadcasted on
261 * their interface only
262 * -> aggregate packet if the current packet is
263 * a "global" packet as well as the base
264 * packet
265 */
266
267 primary_if = primary_if_get_selected(bat_priv);
268 if (!primary_if)
269 goto out;
270
271 /* packets without direct link flag and high TTL
272 * are flooded through the net */
273 if ((!directlink) &&
274 (!(batman_ogm_packet->flags & DIRECTLINK)) &&
275 (batman_ogm_packet->ttl != 1) &&
276
277 /* own packets originating non-primary
278 * interfaces leave only that interface */
279 ((!forw_packet->own) ||
280 (forw_packet->if_incoming == primary_if))) {
281 res = true;
282 goto out;
283 }
284
285 /* if the incoming packet is sent via this one
286 * interface only - we still can aggregate */
287 if ((directlink) &&
288 (new_batman_ogm_packet->ttl == 1) &&
289 (forw_packet->if_incoming == if_incoming) &&
290
291 /* packets from direct neighbors or
292 * own secondary interface packets
293 * (= secondary interface packets in general) */
294 (batman_ogm_packet->flags & DIRECTLINK ||
295 (forw_packet->own &&
296 forw_packet->if_incoming != primary_if))) {
297 res = true;
298 goto out;
299 }
300 }
301
302 out:
303 if (primary_if)
304 hardif_free_ref(primary_if);
305 return res;
306 }
307
308 /* create a new aggregated packet and add this packet to it */
309 static void bat_ogm_aggregate_new(const unsigned char *packet_buff,
310 int packet_len, unsigned long send_time,
311 bool direct_link,
312 struct hard_iface *if_incoming,
313 int own_packet)
314 {
315 struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
316 struct forw_packet *forw_packet_aggr;
317 unsigned char *skb_buff;
318
319 if (!atomic_inc_not_zero(&if_incoming->refcount))
320 return;
321
322 /* own packet should always be scheduled */
323 if (!own_packet) {
324 if (!atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
325 bat_dbg(DBG_BATMAN, bat_priv,
326 "batman packet queue full\n");
327 goto out;
328 }
329 }
330
331 forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
332 if (!forw_packet_aggr) {
333 if (!own_packet)
334 atomic_inc(&bat_priv->batman_queue_left);
335 goto out;
336 }
337
338 if ((atomic_read(&bat_priv->aggregated_ogms)) &&
339 (packet_len < MAX_AGGREGATION_BYTES))
340 forw_packet_aggr->skb = dev_alloc_skb(MAX_AGGREGATION_BYTES +
341 sizeof(struct ethhdr));
342 else
343 forw_packet_aggr->skb = dev_alloc_skb(packet_len +
344 sizeof(struct ethhdr));
345
346 if (!forw_packet_aggr->skb) {
347 if (!own_packet)
348 atomic_inc(&bat_priv->batman_queue_left);
349 kfree(forw_packet_aggr);
350 goto out;
351 }
352 skb_reserve(forw_packet_aggr->skb, sizeof(struct ethhdr));
353
354 INIT_HLIST_NODE(&forw_packet_aggr->list);
355
356 skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
357 forw_packet_aggr->packet_len = packet_len;
358 memcpy(skb_buff, packet_buff, packet_len);
359
360 forw_packet_aggr->own = own_packet;
361 forw_packet_aggr->if_incoming = if_incoming;
362 forw_packet_aggr->num_packets = 0;
363 forw_packet_aggr->direct_link_flags = NO_FLAGS;
364 forw_packet_aggr->send_time = send_time;
365
366 /* save packet direct link flag status */
367 if (direct_link)
368 forw_packet_aggr->direct_link_flags |= 1;
369
370 /* add new packet to packet list */
371 spin_lock_bh(&bat_priv->forw_bat_list_lock);
372 hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
373 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
374
375 /* start timer for this packet */
376 INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
377 send_outstanding_bat_ogm_packet);
378 queue_delayed_work(bat_event_workqueue,
379 &forw_packet_aggr->delayed_work,
380 send_time - jiffies);
381
382 return;
383 out:
384 hardif_free_ref(if_incoming);
385 }
386
387 /* aggregate a new packet into the existing ogm packet */
388 static void bat_ogm_aggregate(struct forw_packet *forw_packet_aggr,
389 const unsigned char *packet_buff,
390 int packet_len, bool direct_link)
391 {
392 unsigned char *skb_buff;
393
394 skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
395 memcpy(skb_buff, packet_buff, packet_len);
396 forw_packet_aggr->packet_len += packet_len;
397 forw_packet_aggr->num_packets++;
398
399 /* save packet direct link flag status */
400 if (direct_link)
401 forw_packet_aggr->direct_link_flags |=
402 (1 << forw_packet_aggr->num_packets);
403 }
404
405 static void bat_ogm_queue_add(struct bat_priv *bat_priv,
406 unsigned char *packet_buff,
407 int packet_len, struct hard_iface *if_incoming,
408 int own_packet, unsigned long send_time)
409 {
410 /**
411 * _aggr -> pointer to the packet we want to aggregate with
412 * _pos -> pointer to the position in the queue
413 */
414 struct forw_packet *forw_packet_aggr = NULL, *forw_packet_pos = NULL;
415 struct hlist_node *tmp_node;
416 struct batman_ogm_packet *batman_ogm_packet;
417 bool direct_link;
418
419 batman_ogm_packet = (struct batman_ogm_packet *)packet_buff;
420 direct_link = batman_ogm_packet->flags & DIRECTLINK ? 1 : 0;
421
422 /* find position for the packet in the forward queue */
423 spin_lock_bh(&bat_priv->forw_bat_list_lock);
424 /* own packets are not to be aggregated */
425 if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
426 hlist_for_each_entry(forw_packet_pos, tmp_node,
427 &bat_priv->forw_bat_list, list) {
428 if (bat_ogm_can_aggregate(batman_ogm_packet,
429 bat_priv, packet_len,
430 send_time, direct_link,
431 if_incoming,
432 forw_packet_pos)) {
433 forw_packet_aggr = forw_packet_pos;
434 break;
435 }
436 }
437 }
438
439 /* nothing to aggregate with - either aggregation disabled or no
440 * suitable aggregation packet found */
441 if (!forw_packet_aggr) {
442 /* the following section can run without the lock */
443 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
444
445 /**
446 * if we could not aggregate this packet with one of the others
447 * we hold it back for a while, so that it might be aggregated
448 * later on
449 */
450 if ((!own_packet) &&
451 (atomic_read(&bat_priv->aggregated_ogms)))
452 send_time += msecs_to_jiffies(MAX_AGGREGATION_MS);
453
454 bat_ogm_aggregate_new(packet_buff, packet_len,
455 send_time, direct_link,
456 if_incoming, own_packet);
457 } else {
458 bat_ogm_aggregate(forw_packet_aggr, packet_buff, packet_len,
459 direct_link);
460 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
461 }
462 }
463
464 static void bat_ogm_forward(struct orig_node *orig_node,
465 const struct ethhdr *ethhdr,
466 struct batman_ogm_packet *batman_ogm_packet,
467 int directlink, struct hard_iface *if_incoming)
468 {
469 struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
470 struct neigh_node *router;
471 uint8_t in_tq, in_ttl, tq_avg = 0;
472 uint8_t tt_num_changes;
473
474 if (batman_ogm_packet->ttl <= 1) {
475 bat_dbg(DBG_BATMAN, bat_priv, "ttl exceeded\n");
476 return;
477 }
478
479 router = orig_node_get_router(orig_node);
480
481 in_tq = batman_ogm_packet->tq;
482 in_ttl = batman_ogm_packet->ttl;
483 tt_num_changes = batman_ogm_packet->tt_num_changes;
484
485 batman_ogm_packet->ttl--;
486 memcpy(batman_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
487
488 /* rebroadcast tq of our best ranking neighbor to ensure the rebroadcast
489 * of our best tq value */
490 if (router && router->tq_avg != 0) {
491
492 /* rebroadcast ogm of best ranking neighbor as is */
493 if (!compare_eth(router->addr, ethhdr->h_source)) {
494 batman_ogm_packet->tq = router->tq_avg;
495
496 if (router->last_ttl)
497 batman_ogm_packet->ttl = router->last_ttl - 1;
498 }
499
500 tq_avg = router->tq_avg;
501 }
502
503 if (router)
504 neigh_node_free_ref(router);
505
506 /* apply hop penalty */
507 batman_ogm_packet->tq = hop_penalty(batman_ogm_packet->tq, bat_priv);
508
509 bat_dbg(DBG_BATMAN, bat_priv,
510 "Forwarding packet: tq_orig: %i, tq_avg: %i, "
511 "tq_forw: %i, ttl_orig: %i, ttl_forw: %i\n",
512 in_tq, tq_avg, batman_ogm_packet->tq, in_ttl - 1,
513 batman_ogm_packet->ttl);
514
515 batman_ogm_packet->seqno = htonl(batman_ogm_packet->seqno);
516 batman_ogm_packet->tt_crc = htons(batman_ogm_packet->tt_crc);
517
518 /* switch of primaries first hop flag when forwarding */
519 batman_ogm_packet->flags &= ~PRIMARIES_FIRST_HOP;
520 if (directlink)
521 batman_ogm_packet->flags |= DIRECTLINK;
522 else
523 batman_ogm_packet->flags &= ~DIRECTLINK;
524
525 bat_ogm_queue_add(bat_priv, (unsigned char *)batman_ogm_packet,
526 BATMAN_OGM_LEN + tt_len(tt_num_changes),
527 if_incoming, 0, bat_ogm_fwd_send_time());
528 }
529
530 void bat_ogm_schedule(struct hard_iface *hard_iface, int tt_num_changes)
531 {
532 struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
533 struct batman_ogm_packet *batman_ogm_packet;
534 struct hard_iface *primary_if;
535 int vis_server;
536
537 vis_server = atomic_read(&bat_priv->vis_mode);
538 primary_if = primary_if_get_selected(bat_priv);
539
540 batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
541
542 /* change sequence number to network order */
543 batman_ogm_packet->seqno =
544 htonl((uint32_t)atomic_read(&hard_iface->seqno));
545
546 batman_ogm_packet->ttvn = atomic_read(&bat_priv->ttvn);
547 batman_ogm_packet->tt_crc = htons((uint16_t)
548 atomic_read(&bat_priv->tt_crc));
549 if (tt_num_changes >= 0)
550 batman_ogm_packet->tt_num_changes = tt_num_changes;
551
552 if (vis_server == VIS_TYPE_SERVER_SYNC)
553 batman_ogm_packet->flags |= VIS_SERVER;
554 else
555 batman_ogm_packet->flags &= ~VIS_SERVER;
556
557 if ((hard_iface == primary_if) &&
558 (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER))
559 batman_ogm_packet->gw_flags =
560 (uint8_t)atomic_read(&bat_priv->gw_bandwidth);
561 else
562 batman_ogm_packet->gw_flags = NO_FLAGS;
563
564 atomic_inc(&hard_iface->seqno);
565
566 slide_own_bcast_window(hard_iface);
567 bat_ogm_queue_add(bat_priv, hard_iface->packet_buff,
568 hard_iface->packet_len, hard_iface, 1,
569 bat_ogm_emit_send_time(bat_priv));
570
571 if (primary_if)
572 hardif_free_ref(primary_if);
573 }
574
575 static void bat_ogm_orig_update(struct bat_priv *bat_priv,
576 struct orig_node *orig_node,
577 const struct ethhdr *ethhdr,
578 const struct batman_ogm_packet
579 *batman_ogm_packet,
580 struct hard_iface *if_incoming,
581 const unsigned char *tt_buff, int is_duplicate)
582 {
583 struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
584 struct neigh_node *router = NULL;
585 struct orig_node *orig_node_tmp;
586 struct hlist_node *node;
587 uint8_t bcast_own_sum_orig, bcast_own_sum_neigh;
588
589 bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): "
590 "Searching and updating originator entry of received packet\n");
591
592 rcu_read_lock();
593 hlist_for_each_entry_rcu(tmp_neigh_node, node,
594 &orig_node->neigh_list, list) {
595 if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&
596 (tmp_neigh_node->if_incoming == if_incoming) &&
597 atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
598 if (neigh_node)
599 neigh_node_free_ref(neigh_node);
600 neigh_node = tmp_neigh_node;
601 continue;
602 }
603
604 if (is_duplicate)
605 continue;
606
607 spin_lock_bh(&tmp_neigh_node->tq_lock);
608 ring_buffer_set(tmp_neigh_node->tq_recv,
609 &tmp_neigh_node->tq_index, 0);
610 tmp_neigh_node->tq_avg =
611 ring_buffer_avg(tmp_neigh_node->tq_recv);
612 spin_unlock_bh(&tmp_neigh_node->tq_lock);
613 }
614
615 if (!neigh_node) {
616 struct orig_node *orig_tmp;
617
618 orig_tmp = get_orig_node(bat_priv, ethhdr->h_source);
619 if (!orig_tmp)
620 goto unlock;
621
622 neigh_node = create_neighbor(orig_node, orig_tmp,
623 ethhdr->h_source, if_incoming);
624
625 orig_node_free_ref(orig_tmp);
626 if (!neigh_node)
627 goto unlock;
628 } else
629 bat_dbg(DBG_BATMAN, bat_priv,
630 "Updating existing last-hop neighbor of originator\n");
631
632 rcu_read_unlock();
633
634 orig_node->flags = batman_ogm_packet->flags;
635 neigh_node->last_valid = jiffies;
636
637 spin_lock_bh(&neigh_node->tq_lock);
638 ring_buffer_set(neigh_node->tq_recv,
639 &neigh_node->tq_index,
640 batman_ogm_packet->tq);
641 neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
642 spin_unlock_bh(&neigh_node->tq_lock);
643
644 if (!is_duplicate) {
645 orig_node->last_ttl = batman_ogm_packet->ttl;
646 neigh_node->last_ttl = batman_ogm_packet->ttl;
647 }
648
649 bonding_candidate_add(orig_node, neigh_node);
650
651 /* if this neighbor already is our next hop there is nothing
652 * to change */
653 router = orig_node_get_router(orig_node);
654 if (router == neigh_node)
655 goto update_tt;
656
657 /* if this neighbor does not offer a better TQ we won't consider it */
658 if (router && (router->tq_avg > neigh_node->tq_avg))
659 goto update_tt;
660
661 /* if the TQ is the same and the link not more symmetric we
662 * won't consider it either */
663 if (router && (neigh_node->tq_avg == router->tq_avg)) {
664 orig_node_tmp = router->orig_node;
665 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
666 bcast_own_sum_orig =
667 orig_node_tmp->bcast_own_sum[if_incoming->if_num];
668 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
669
670 orig_node_tmp = neigh_node->orig_node;
671 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
672 bcast_own_sum_neigh =
673 orig_node_tmp->bcast_own_sum[if_incoming->if_num];
674 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
675
676 if (bcast_own_sum_orig >= bcast_own_sum_neigh)
677 goto update_tt;
678 }
679
680 update_route(bat_priv, orig_node, neigh_node);
681
682 update_tt:
683 /* I have to check for transtable changes only if the OGM has been
684 * sent through a primary interface */
685 if (((batman_ogm_packet->orig != ethhdr->h_source) &&
686 (batman_ogm_packet->ttl > 2)) ||
687 (batman_ogm_packet->flags & PRIMARIES_FIRST_HOP))
688 tt_update_orig(bat_priv, orig_node, tt_buff,
689 batman_ogm_packet->tt_num_changes,
690 batman_ogm_packet->ttvn,
691 batman_ogm_packet->tt_crc);
692
693 if (orig_node->gw_flags != batman_ogm_packet->gw_flags)
694 gw_node_update(bat_priv, orig_node,
695 batman_ogm_packet->gw_flags);
696
697 orig_node->gw_flags = batman_ogm_packet->gw_flags;
698
699 /* restart gateway selection if fast or late switching was enabled */
700 if ((orig_node->gw_flags) &&
701 (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) &&
702 (atomic_read(&bat_priv->gw_sel_class) > 2))
703 gw_check_election(bat_priv, orig_node);
704
705 goto out;
706
707 unlock:
708 rcu_read_unlock();
709 out:
710 if (neigh_node)
711 neigh_node_free_ref(neigh_node);
712 if (router)
713 neigh_node_free_ref(router);
714 }
715
716 static int bat_ogm_calc_tq(struct orig_node *orig_node,
717 struct orig_node *orig_neigh_node,
718 struct batman_ogm_packet *batman_ogm_packet,
719 struct hard_iface *if_incoming)
720 {
721 struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
722 struct neigh_node *neigh_node = NULL, *tmp_neigh_node;
723 struct hlist_node *node;
724 uint8_t total_count;
725 uint8_t orig_eq_count, neigh_rq_count, tq_own;
726 int tq_asym_penalty, ret = 0;
727
728 /* find corresponding one hop neighbor */
729 rcu_read_lock();
730 hlist_for_each_entry_rcu(tmp_neigh_node, node,
731 &orig_neigh_node->neigh_list, list) {
732
733 if (!compare_eth(tmp_neigh_node->addr, orig_neigh_node->orig))
734 continue;
735
736 if (tmp_neigh_node->if_incoming != if_incoming)
737 continue;
738
739 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
740 continue;
741
742 neigh_node = tmp_neigh_node;
743 break;
744 }
745 rcu_read_unlock();
746
747 if (!neigh_node)
748 neigh_node = create_neighbor(orig_neigh_node,
749 orig_neigh_node,
750 orig_neigh_node->orig,
751 if_incoming);
752
753 if (!neigh_node)
754 goto out;
755
756 /* if orig_node is direct neighbor update neigh_node last_valid */
757 if (orig_node == orig_neigh_node)
758 neigh_node->last_valid = jiffies;
759
760 orig_node->last_valid = jiffies;
761
762 /* find packet count of corresponding one hop neighbor */
763 spin_lock_bh(&orig_node->ogm_cnt_lock);
764 orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];
765 neigh_rq_count = neigh_node->real_packet_count;
766 spin_unlock_bh(&orig_node->ogm_cnt_lock);
767
768 /* pay attention to not get a value bigger than 100 % */
769 total_count = (orig_eq_count > neigh_rq_count ?
770 neigh_rq_count : orig_eq_count);
771
772 /* if we have too few packets (too less data) we set tq_own to zero */
773 /* if we receive too few packets it is not considered bidirectional */
774 if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) ||
775 (neigh_rq_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM))
776 tq_own = 0;
777 else
778 /* neigh_node->real_packet_count is never zero as we
779 * only purge old information when getting new
780 * information */
781 tq_own = (TQ_MAX_VALUE * total_count) / neigh_rq_count;
782
783 /*
784 * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
785 * affect the nearly-symmetric links only a little, but
786 * punishes asymmetric links more. This will give a value
787 * between 0 and TQ_MAX_VALUE
788 */
789 tq_asym_penalty = TQ_MAX_VALUE - (TQ_MAX_VALUE *
790 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *
791 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *
792 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count)) /
793 (TQ_LOCAL_WINDOW_SIZE *
794 TQ_LOCAL_WINDOW_SIZE *
795 TQ_LOCAL_WINDOW_SIZE);
796
797 batman_ogm_packet->tq = ((batman_ogm_packet->tq * tq_own
798 * tq_asym_penalty) /
799 (TQ_MAX_VALUE * TQ_MAX_VALUE));
800
801 bat_dbg(DBG_BATMAN, bat_priv,
802 "bidirectional: "
803 "orig = %-15pM neigh = %-15pM => own_bcast = %2i, "
804 "real recv = %2i, local tq: %3i, asym_penalty: %3i, "
805 "total tq: %3i\n",
806 orig_node->orig, orig_neigh_node->orig, total_count,
807 neigh_rq_count, tq_own, tq_asym_penalty, batman_ogm_packet->tq);
808
809 /* if link has the minimum required transmission quality
810 * consider it bidirectional */
811 if (batman_ogm_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT)
812 ret = 1;
813
814 out:
815 if (neigh_node)
816 neigh_node_free_ref(neigh_node);
817 return ret;
818 }
819
820 /* processes a batman packet for all interfaces, adjusts the sequence number and
821 * finds out whether it is a duplicate.
822 * returns:
823 * 1 the packet is a duplicate
824 * 0 the packet has not yet been received
825 * -1 the packet is old and has been received while the seqno window
826 * was protected. Caller should drop it.
827 */
828 static int bat_ogm_update_seqnos(const struct ethhdr *ethhdr,
829 const struct batman_ogm_packet
830 *batman_ogm_packet,
831 const struct hard_iface *if_incoming)
832 {
833 struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
834 struct orig_node *orig_node;
835 struct neigh_node *tmp_neigh_node;
836 struct hlist_node *node;
837 int is_duplicate = 0;
838 int32_t seq_diff;
839 int need_update = 0;
840 int set_mark, ret = -1;
841
842 orig_node = get_orig_node(bat_priv, batman_ogm_packet->orig);
843 if (!orig_node)
844 return 0;
845
846 spin_lock_bh(&orig_node->ogm_cnt_lock);
847 seq_diff = batman_ogm_packet->seqno - orig_node->last_real_seqno;
848
849 /* signalize caller that the packet is to be dropped. */
850 if (window_protected(bat_priv, seq_diff,
851 &orig_node->batman_seqno_reset))
852 goto out;
853
854 rcu_read_lock();
855 hlist_for_each_entry_rcu(tmp_neigh_node, node,
856 &orig_node->neigh_list, list) {
857
858 is_duplicate |= get_bit_status(tmp_neigh_node->real_bits,
859 orig_node->last_real_seqno,
860 batman_ogm_packet->seqno);
861
862 if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&
863 (tmp_neigh_node->if_incoming == if_incoming))
864 set_mark = 1;
865 else
866 set_mark = 0;
867
868 /* if the window moved, set the update flag. */
869 need_update |= bit_get_packet(bat_priv,
870 tmp_neigh_node->real_bits,
871 seq_diff, set_mark);
872
873 tmp_neigh_node->real_packet_count =
874 bit_packet_count(tmp_neigh_node->real_bits);
875 }
876 rcu_read_unlock();
877
878 if (need_update) {
879 bat_dbg(DBG_BATMAN, bat_priv,
880 "updating last_seqno: old %d, new %d\n",
881 orig_node->last_real_seqno, batman_ogm_packet->seqno);
882 orig_node->last_real_seqno = batman_ogm_packet->seqno;
883 }
884
885 ret = is_duplicate;
886
887 out:
888 spin_unlock_bh(&orig_node->ogm_cnt_lock);
889 orig_node_free_ref(orig_node);
890 return ret;
891 }
892
893 static void bat_ogm_process(const struct ethhdr *ethhdr,
894 struct batman_ogm_packet *batman_ogm_packet,
895 const unsigned char *tt_buff,
896 struct hard_iface *if_incoming)
897 {
898 struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
899 struct hard_iface *hard_iface;
900 struct orig_node *orig_neigh_node, *orig_node;
901 struct neigh_node *router = NULL, *router_router = NULL;
902 struct neigh_node *orig_neigh_router = NULL;
903 int has_directlink_flag;
904 int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
905 int is_broadcast = 0, is_bidirectional, is_single_hop_neigh;
906 int is_duplicate;
907 uint32_t if_incoming_seqno;
908
909 /* Silently drop when the batman packet is actually not a
910 * correct packet.
911 *
912 * This might happen if a packet is padded (e.g. Ethernet has a
913 * minimum frame length of 64 byte) and the aggregation interprets
914 * it as an additional length.
915 *
916 * TODO: A more sane solution would be to have a bit in the
917 * batman_ogm_packet to detect whether the packet is the last
918 * packet in an aggregation. Here we expect that the padding
919 * is always zero (or not 0x01)
920 */
921 if (batman_ogm_packet->packet_type != BAT_OGM)
922 return;
923
924 /* could be changed by schedule_own_packet() */
925 if_incoming_seqno = atomic_read(&if_incoming->seqno);
926
927 has_directlink_flag = (batman_ogm_packet->flags & DIRECTLINK ? 1 : 0);
928
929 is_single_hop_neigh = (compare_eth(ethhdr->h_source,
930 batman_ogm_packet->orig) ? 1 : 0);
931
932 bat_dbg(DBG_BATMAN, bat_priv,
933 "Received BATMAN packet via NB: %pM, IF: %s [%pM] "
934 "(from OG: %pM, via prev OG: %pM, seqno %d, ttvn %u, "
935 "crc %u, changes %u, td %d, TTL %d, V %d, IDF %d)\n",
936 ethhdr->h_source, if_incoming->net_dev->name,
937 if_incoming->net_dev->dev_addr, batman_ogm_packet->orig,
938 batman_ogm_packet->prev_sender, batman_ogm_packet->seqno,
939 batman_ogm_packet->ttvn, batman_ogm_packet->tt_crc,
940 batman_ogm_packet->tt_num_changes, batman_ogm_packet->tq,
941 batman_ogm_packet->ttl, batman_ogm_packet->version,
942 has_directlink_flag);
943
944 rcu_read_lock();
945 list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
946 if (hard_iface->if_status != IF_ACTIVE)
947 continue;
948
949 if (hard_iface->soft_iface != if_incoming->soft_iface)
950 continue;
951
952 if (compare_eth(ethhdr->h_source,
953 hard_iface->net_dev->dev_addr))
954 is_my_addr = 1;
955
956 if (compare_eth(batman_ogm_packet->orig,
957 hard_iface->net_dev->dev_addr))
958 is_my_orig = 1;
959
960 if (compare_eth(batman_ogm_packet->prev_sender,
961 hard_iface->net_dev->dev_addr))
962 is_my_oldorig = 1;
963
964 if (is_broadcast_ether_addr(ethhdr->h_source))
965 is_broadcast = 1;
966 }
967 rcu_read_unlock();
968
969 if (batman_ogm_packet->version != COMPAT_VERSION) {
970 bat_dbg(DBG_BATMAN, bat_priv,
971 "Drop packet: incompatible batman version (%i)\n",
972 batman_ogm_packet->version);
973 return;
974 }
975
976 if (is_my_addr) {
977 bat_dbg(DBG_BATMAN, bat_priv,
978 "Drop packet: received my own broadcast (sender: %pM"
979 ")\n",
980 ethhdr->h_source);
981 return;
982 }
983
984 if (is_broadcast) {
985 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
986 "ignoring all packets with broadcast source addr (sender: %pM"
987 ")\n", ethhdr->h_source);
988 return;
989 }
990
991 if (is_my_orig) {
992 unsigned long *word;
993 int offset;
994
995 orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source);
996 if (!orig_neigh_node)
997 return;
998
999 /* neighbor has to indicate direct link and it has to
1000 * come via the corresponding interface */
1001 /* save packet seqno for bidirectional check */
1002 if (has_directlink_flag &&
1003 compare_eth(if_incoming->net_dev->dev_addr,
1004 batman_ogm_packet->orig)) {
1005 offset = if_incoming->if_num * NUM_WORDS;
1006
1007 spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
1008 word = &(orig_neigh_node->bcast_own[offset]);
1009 bit_mark(word,
1010 if_incoming_seqno -
1011 batman_ogm_packet->seqno - 2);
1012 orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
1013 bit_packet_count(word);
1014 spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
1015 }
1016
1017 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
1018 "originator packet from myself (via neighbor)\n");
1019 orig_node_free_ref(orig_neigh_node);
1020 return;
1021 }
1022
1023 if (is_my_oldorig) {
1024 bat_dbg(DBG_BATMAN, bat_priv,
1025 "Drop packet: ignoring all rebroadcast echos (sender: "
1026 "%pM)\n", ethhdr->h_source);
1027 return;
1028 }
1029
1030 orig_node = get_orig_node(bat_priv, batman_ogm_packet->orig);
1031 if (!orig_node)
1032 return;
1033
1034 is_duplicate = bat_ogm_update_seqnos(ethhdr, batman_ogm_packet,
1035 if_incoming);
1036
1037 if (is_duplicate == -1) {
1038 bat_dbg(DBG_BATMAN, bat_priv,
1039 "Drop packet: packet within seqno protection time "
1040 "(sender: %pM)\n", ethhdr->h_source);
1041 goto out;
1042 }
1043
1044 if (batman_ogm_packet->tq == 0) {
1045 bat_dbg(DBG_BATMAN, bat_priv,
1046 "Drop packet: originator packet with tq equal 0\n");
1047 goto out;
1048 }
1049
1050 router = orig_node_get_router(orig_node);
1051 if (router)
1052 router_router = orig_node_get_router(router->orig_node);
1053
1054 /* avoid temporary routing loops */
1055 if (router && router_router &&
1056 (compare_eth(router->addr, batman_ogm_packet->prev_sender)) &&
1057 !(compare_eth(batman_ogm_packet->orig,
1058 batman_ogm_packet->prev_sender)) &&
1059 (compare_eth(router->addr, router_router->addr))) {
1060 bat_dbg(DBG_BATMAN, bat_priv,
1061 "Drop packet: ignoring all rebroadcast packets that "
1062 "may make me loop (sender: %pM)\n", ethhdr->h_source);
1063 goto out;
1064 }
1065
1066 /* if sender is a direct neighbor the sender mac equals
1067 * originator mac */
1068 orig_neigh_node = (is_single_hop_neigh ?
1069 orig_node :
1070 get_orig_node(bat_priv, ethhdr->h_source));
1071 if (!orig_neigh_node)
1072 goto out;
1073
1074 orig_neigh_router = orig_node_get_router(orig_neigh_node);
1075
1076 /* drop packet if sender is not a direct neighbor and if we
1077 * don't route towards it */
1078 if (!is_single_hop_neigh && (!orig_neigh_router)) {
1079 bat_dbg(DBG_BATMAN, bat_priv,
1080 "Drop packet: OGM via unknown neighbor!\n");
1081 goto out_neigh;
1082 }
1083
1084 is_bidirectional = bat_ogm_calc_tq(orig_node, orig_neigh_node,
1085 batman_ogm_packet, if_incoming);
1086
1087 bonding_save_primary(orig_node, orig_neigh_node, batman_ogm_packet);
1088
1089 /* update ranking if it is not a duplicate or has the same
1090 * seqno and similar ttl as the non-duplicate */
1091 if (is_bidirectional &&
1092 (!is_duplicate ||
1093 ((orig_node->last_real_seqno == batman_ogm_packet->seqno) &&
1094 (orig_node->last_ttl - 3 <= batman_ogm_packet->ttl))))
1095 bat_ogm_orig_update(bat_priv, orig_node, ethhdr,
1096 batman_ogm_packet, if_incoming,
1097 tt_buff, is_duplicate);
1098
1099 /* is single hop (direct) neighbor */
1100 if (is_single_hop_neigh) {
1101
1102 /* mark direct link on incoming interface */
1103 bat_ogm_forward(orig_node, ethhdr, batman_ogm_packet,
1104 1, if_incoming);
1105
1106 bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: "
1107 "rebroadcast neighbor packet with direct link flag\n");
1108 goto out_neigh;
1109 }
1110
1111 /* multihop originator */
1112 if (!is_bidirectional) {
1113 bat_dbg(DBG_BATMAN, bat_priv,
1114 "Drop packet: not received via bidirectional link\n");
1115 goto out_neigh;
1116 }
1117
1118 if (is_duplicate) {
1119 bat_dbg(DBG_BATMAN, bat_priv,
1120 "Drop packet: duplicate packet received\n");
1121 goto out_neigh;
1122 }
1123
1124 bat_dbg(DBG_BATMAN, bat_priv,
1125 "Forwarding packet: rebroadcast originator packet\n");
1126 bat_ogm_forward(orig_node, ethhdr, batman_ogm_packet, 0, if_incoming);
1127
1128 out_neigh:
1129 if ((orig_neigh_node) && (!is_single_hop_neigh))
1130 orig_node_free_ref(orig_neigh_node);
1131 out:
1132 if (router)
1133 neigh_node_free_ref(router);
1134 if (router_router)
1135 neigh_node_free_ref(router_router);
1136 if (orig_neigh_router)
1137 neigh_node_free_ref(orig_neigh_router);
1138
1139 orig_node_free_ref(orig_node);
1140 }
1141
1142 void bat_ogm_receive(const struct ethhdr *ethhdr, unsigned char *packet_buff,
1143 int packet_len, struct hard_iface *if_incoming)
1144 {
1145 struct batman_ogm_packet *batman_ogm_packet;
1146 int buff_pos = 0;
1147 unsigned char *tt_buff;
1148
1149 batman_ogm_packet = (struct batman_ogm_packet *)packet_buff;
1150
1151 /* unpack the aggregated packets and process them one by one */
1152 do {
1153 /* network to host order for our 32bit seqno and the
1154 orig_interval */
1155 batman_ogm_packet->seqno = ntohl(batman_ogm_packet->seqno);
1156 batman_ogm_packet->tt_crc = ntohs(batman_ogm_packet->tt_crc);
1157
1158 tt_buff = packet_buff + buff_pos + BATMAN_OGM_LEN;
1159
1160 bat_ogm_process(ethhdr, batman_ogm_packet,
1161 tt_buff, if_incoming);
1162
1163 buff_pos += BATMAN_OGM_LEN +
1164 tt_len(batman_ogm_packet->tt_num_changes);
1165
1166 batman_ogm_packet = (struct batman_ogm_packet *)
1167 (packet_buff + buff_pos);
1168 } while (bat_ogm_aggr_packet(buff_pos, packet_len,
1169 batman_ogm_packet->tt_num_changes));
1170 }