1 /* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors:
3 * Marek Lindner, Simon Wunderlich
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.
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.
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
21 #include "translation-table.h"
22 #include "ring_buffer.h"
23 #include "originator.h"
25 #include "gateway_common.h"
26 #include "gateway_client.h"
27 #include "hard-interface.h"
30 #include "network-coding.h"
33 * batadv_dup_status - duplicate status
34 * @BATADV_NO_DUP: the packet is a duplicate
35 * @BATADV_ORIG_DUP: OGM is a duplicate in the originator (but not for the
37 * @BATADV_NEIGH_DUP: OGM is a duplicate for the neighbor
38 * @BATADV_PROTECTED: originator is currently protected (after reboot)
40 enum batadv_dup_status {
47 static struct batadv_neigh_node *
48 batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface,
49 const uint8_t *neigh_addr,
50 struct batadv_orig_node *orig_node,
51 struct batadv_orig_node *orig_neigh, __be32 seqno)
53 struct batadv_neigh_node *neigh_node;
55 neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr,
60 INIT_LIST_HEAD(&neigh_node->bonding_list);
62 neigh_node->orig_node = orig_neigh;
63 neigh_node->if_incoming = hard_iface;
65 spin_lock_bh(&orig_node->neigh_list_lock);
66 hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
67 spin_unlock_bh(&orig_node->neigh_list_lock);
73 static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
75 struct batadv_ogm_packet *batadv_ogm_packet;
76 unsigned char *ogm_buff;
77 uint32_t random_seqno;
80 /* randomize initial seqno to avoid collision */
81 get_random_bytes(&random_seqno, sizeof(random_seqno));
82 atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno);
84 hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN;
85 ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC);
89 hard_iface->bat_iv.ogm_buff = ogm_buff;
91 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
92 batadv_ogm_packet->header.packet_type = BATADV_IV_OGM;
93 batadv_ogm_packet->header.version = BATADV_COMPAT_VERSION;
94 batadv_ogm_packet->header.ttl = 2;
95 batadv_ogm_packet->flags = BATADV_NO_FLAGS;
96 batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
97 batadv_ogm_packet->tt_num_changes = 0;
98 batadv_ogm_packet->ttvn = 0;
106 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
108 kfree(hard_iface->bat_iv.ogm_buff);
109 hard_iface->bat_iv.ogm_buff = NULL;
112 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
114 struct batadv_ogm_packet *batadv_ogm_packet;
115 unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
117 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
118 memcpy(batadv_ogm_packet->orig,
119 hard_iface->net_dev->dev_addr, ETH_ALEN);
120 memcpy(batadv_ogm_packet->prev_sender,
121 hard_iface->net_dev->dev_addr, ETH_ALEN);
125 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
127 struct batadv_ogm_packet *batadv_ogm_packet;
128 unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
130 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
131 batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP;
132 batadv_ogm_packet->header.ttl = BATADV_TTL;
135 /* when do we schedule our own ogm to be sent */
137 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
141 msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
142 msecs += prandom_u32() % (2 * BATADV_JITTER);
144 return jiffies + msecs_to_jiffies(msecs);
147 /* when do we schedule a ogm packet to be sent */
148 static unsigned long batadv_iv_ogm_fwd_send_time(void)
150 return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2));
153 /* apply hop penalty for a normal link */
154 static uint8_t batadv_hop_penalty(uint8_t tq,
155 const struct batadv_priv *bat_priv)
157 int hop_penalty = atomic_read(&bat_priv->hop_penalty);
160 new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
161 new_tq /= BATADV_TQ_MAX_VALUE;
166 /* is there another aggregated packet here? */
167 static int batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
170 int next_buff_pos = 0;
172 next_buff_pos += buff_pos + BATADV_OGM_HLEN;
173 next_buff_pos += batadv_tt_len(tt_num_changes);
175 return (next_buff_pos <= packet_len) &&
176 (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
179 /* send a batman ogm to a given interface */
180 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
181 struct batadv_hard_iface *hard_iface)
183 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
187 struct batadv_ogm_packet *batadv_ogm_packet;
191 if (hard_iface->if_status != BATADV_IF_ACTIVE)
196 packet_pos = forw_packet->skb->data;
197 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
199 /* adjust all flags and log packets */
200 while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
201 batadv_ogm_packet->tt_num_changes)) {
202 /* we might have aggregated direct link packets with an
203 * ordinary base packet
205 if (forw_packet->direct_link_flags & BIT(packet_num) &&
206 forw_packet->if_incoming == hard_iface)
207 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
209 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
211 if (packet_num > 0 || !forw_packet->own)
212 fwd_str = "Forwarding";
214 fwd_str = "Sending own";
216 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
217 "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n",
218 fwd_str, (packet_num > 0 ? "aggregated " : ""),
219 batadv_ogm_packet->orig,
220 ntohl(batadv_ogm_packet->seqno),
221 batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl,
222 (batadv_ogm_packet->flags & BATADV_DIRECTLINK ?
224 batadv_ogm_packet->ttvn, hard_iface->net_dev->name,
225 hard_iface->net_dev->dev_addr);
227 buff_pos += BATADV_OGM_HLEN;
228 buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes);
230 packet_pos = forw_packet->skb->data + buff_pos;
231 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
234 /* create clone because function is called more than once */
235 skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
237 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
238 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
239 skb->len + ETH_HLEN);
240 batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr);
244 /* send a batman ogm packet */
245 static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
247 struct batadv_hard_iface *hard_iface;
248 struct net_device *soft_iface;
249 struct batadv_priv *bat_priv;
250 struct batadv_hard_iface *primary_if = NULL;
251 struct batadv_ogm_packet *batadv_ogm_packet;
252 unsigned char directlink;
255 packet_pos = forw_packet->skb->data;
256 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
257 directlink = (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0);
259 if (!forw_packet->if_incoming) {
260 pr_err("Error - can't forward packet: incoming iface not specified\n");
264 soft_iface = forw_packet->if_incoming->soft_iface;
265 bat_priv = netdev_priv(soft_iface);
267 if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
270 primary_if = batadv_primary_if_get_selected(bat_priv);
274 /* multihomed peer assumed
275 * non-primary OGMs are only broadcasted on their interface
277 if ((directlink && (batadv_ogm_packet->header.ttl == 1)) ||
278 (forw_packet->own && (forw_packet->if_incoming != primary_if))) {
279 /* FIXME: what about aggregated packets ? */
280 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
281 "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n",
282 (forw_packet->own ? "Sending own" : "Forwarding"),
283 batadv_ogm_packet->orig,
284 ntohl(batadv_ogm_packet->seqno),
285 batadv_ogm_packet->header.ttl,
286 forw_packet->if_incoming->net_dev->name,
287 forw_packet->if_incoming->net_dev->dev_addr);
289 /* skb is only used once and than forw_packet is free'd */
290 batadv_send_skb_packet(forw_packet->skb,
291 forw_packet->if_incoming,
292 batadv_broadcast_addr);
293 forw_packet->skb = NULL;
298 /* broadcast on every interface */
300 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
301 if (hard_iface->soft_iface != soft_iface)
304 batadv_iv_ogm_send_to_if(forw_packet, hard_iface);
310 batadv_hardif_free_ref(primary_if);
313 /* return true if new_packet can be aggregated with forw_packet */
315 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
316 struct batadv_priv *bat_priv,
317 int packet_len, unsigned long send_time,
319 const struct batadv_hard_iface *if_incoming,
320 const struct batadv_forw_packet *forw_packet)
322 struct batadv_ogm_packet *batadv_ogm_packet;
323 int aggregated_bytes = forw_packet->packet_len + packet_len;
324 struct batadv_hard_iface *primary_if = NULL;
326 unsigned long aggregation_end_time;
328 batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
329 aggregation_end_time = send_time;
330 aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
332 /* we can aggregate the current packet to this aggregated packet
335 * - the send time is within our MAX_AGGREGATION_MS time
336 * - the resulting packet wont be bigger than
337 * MAX_AGGREGATION_BYTES
339 if (time_before(send_time, forw_packet->send_time) &&
340 time_after_eq(aggregation_end_time, forw_packet->send_time) &&
341 (aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) {
342 /* check aggregation compatibility
343 * -> direct link packets are broadcasted on
344 * their interface only
345 * -> aggregate packet if the current packet is
346 * a "global" packet as well as the base
349 primary_if = batadv_primary_if_get_selected(bat_priv);
353 /* packets without direct link flag and high TTL
354 * are flooded through the net
357 (!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) &&
358 (batadv_ogm_packet->header.ttl != 1) &&
360 /* own packets originating non-primary
361 * interfaces leave only that interface
363 ((!forw_packet->own) ||
364 (forw_packet->if_incoming == primary_if))) {
369 /* if the incoming packet is sent via this one
370 * interface only - we still can aggregate
373 (new_bat_ogm_packet->header.ttl == 1) &&
374 (forw_packet->if_incoming == if_incoming) &&
376 /* packets from direct neighbors or
377 * own secondary interface packets
378 * (= secondary interface packets in general)
380 (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
382 forw_packet->if_incoming != primary_if))) {
390 batadv_hardif_free_ref(primary_if);
394 /* create a new aggregated packet and add this packet to it */
395 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
396 int packet_len, unsigned long send_time,
398 struct batadv_hard_iface *if_incoming,
401 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
402 struct batadv_forw_packet *forw_packet_aggr;
403 unsigned char *skb_buff;
404 unsigned int skb_size;
406 if (!atomic_inc_not_zero(&if_incoming->refcount))
409 /* own packet should always be scheduled */
411 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
412 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
413 "batman packet queue full\n");
418 forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
419 if (!forw_packet_aggr) {
421 atomic_inc(&bat_priv->batman_queue_left);
425 if ((atomic_read(&bat_priv->aggregated_ogms)) &&
426 (packet_len < BATADV_MAX_AGGREGATION_BYTES))
427 skb_size = BATADV_MAX_AGGREGATION_BYTES;
429 skb_size = packet_len;
431 skb_size += ETH_HLEN + NET_IP_ALIGN;
433 forw_packet_aggr->skb = dev_alloc_skb(skb_size);
434 if (!forw_packet_aggr->skb) {
436 atomic_inc(&bat_priv->batman_queue_left);
437 kfree(forw_packet_aggr);
440 skb_reserve(forw_packet_aggr->skb, ETH_HLEN + NET_IP_ALIGN);
442 INIT_HLIST_NODE(&forw_packet_aggr->list);
444 skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
445 forw_packet_aggr->packet_len = packet_len;
446 memcpy(skb_buff, packet_buff, packet_len);
448 forw_packet_aggr->own = own_packet;
449 forw_packet_aggr->if_incoming = if_incoming;
450 forw_packet_aggr->num_packets = 0;
451 forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
452 forw_packet_aggr->send_time = send_time;
454 /* save packet direct link flag status */
456 forw_packet_aggr->direct_link_flags |= 1;
458 /* add new packet to packet list */
459 spin_lock_bh(&bat_priv->forw_bat_list_lock);
460 hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
461 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
463 /* start timer for this packet */
464 INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
465 batadv_send_outstanding_bat_ogm_packet);
466 queue_delayed_work(batadv_event_workqueue,
467 &forw_packet_aggr->delayed_work,
468 send_time - jiffies);
472 batadv_hardif_free_ref(if_incoming);
475 /* aggregate a new packet into the existing ogm packet */
476 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
477 const unsigned char *packet_buff,
478 int packet_len, bool direct_link)
480 unsigned char *skb_buff;
481 unsigned long new_direct_link_flag;
483 skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
484 memcpy(skb_buff, packet_buff, packet_len);
485 forw_packet_aggr->packet_len += packet_len;
486 forw_packet_aggr->num_packets++;
488 /* save packet direct link flag status */
490 new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
491 forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
495 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
496 unsigned char *packet_buff,
498 struct batadv_hard_iface *if_incoming,
499 int own_packet, unsigned long send_time)
501 /* _aggr -> pointer to the packet we want to aggregate with
502 * _pos -> pointer to the position in the queue
504 struct batadv_forw_packet *forw_packet_aggr = NULL;
505 struct batadv_forw_packet *forw_packet_pos = NULL;
506 struct batadv_ogm_packet *batadv_ogm_packet;
508 unsigned long max_aggregation_jiffies;
510 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
511 direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0;
512 max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
514 /* find position for the packet in the forward queue */
515 spin_lock_bh(&bat_priv->forw_bat_list_lock);
516 /* own packets are not to be aggregated */
517 if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
518 hlist_for_each_entry(forw_packet_pos,
519 &bat_priv->forw_bat_list, list) {
520 if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
521 bat_priv, packet_len,
522 send_time, direct_link,
525 forw_packet_aggr = forw_packet_pos;
531 /* nothing to aggregate with - either aggregation disabled or no
532 * suitable aggregation packet found
534 if (!forw_packet_aggr) {
535 /* the following section can run without the lock */
536 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
538 /* if we could not aggregate this packet with one of the others
539 * we hold it back for a while, so that it might be aggregated
542 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
543 send_time += max_aggregation_jiffies;
545 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
546 send_time, direct_link,
547 if_incoming, own_packet);
549 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
550 packet_len, direct_link);
551 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
555 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
556 const struct ethhdr *ethhdr,
557 struct batadv_ogm_packet *batadv_ogm_packet,
558 bool is_single_hop_neigh,
559 bool is_from_best_next_hop,
560 struct batadv_hard_iface *if_incoming)
562 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
563 uint8_t tt_num_changes;
565 if (batadv_ogm_packet->header.ttl <= 1) {
566 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
570 if (!is_from_best_next_hop) {
571 /* Mark the forwarded packet when it is not coming from our
572 * best next hop. We still need to forward the packet for our
573 * neighbor link quality detection to work in case the packet
574 * originated from a single hop neighbor. Otherwise we can
575 * simply drop the ogm.
577 if (is_single_hop_neigh)
578 batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
583 tt_num_changes = batadv_ogm_packet->tt_num_changes;
585 batadv_ogm_packet->header.ttl--;
586 memcpy(batadv_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
588 /* apply hop penalty */
589 batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
592 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
593 "Forwarding packet: tq: %i, ttl: %i\n",
594 batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl);
596 /* switch of primaries first hop flag when forwarding */
597 batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP;
598 if (is_single_hop_neigh)
599 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
601 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
603 batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
604 BATADV_OGM_HLEN + batadv_tt_len(tt_num_changes),
605 if_incoming, 0, batadv_iv_ogm_fwd_send_time());
608 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
610 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
611 unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
612 struct batadv_ogm_packet *batadv_ogm_packet;
613 struct batadv_hard_iface *primary_if;
614 int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
615 int vis_server, tt_num_changes = 0;
619 vis_server = atomic_read(&bat_priv->vis_mode);
620 primary_if = batadv_primary_if_get_selected(bat_priv);
622 if (hard_iface == primary_if)
623 tt_num_changes = batadv_tt_append_diff(bat_priv, ogm_buff,
627 batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
629 /* change sequence number to network order */
630 seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno);
631 batadv_ogm_packet->seqno = htonl(seqno);
632 atomic_inc(&hard_iface->bat_iv.ogm_seqno);
634 batadv_ogm_packet->ttvn = atomic_read(&bat_priv->tt.vn);
635 batadv_ogm_packet->tt_crc = htons(bat_priv->tt.local_crc);
636 if (tt_num_changes >= 0)
637 batadv_ogm_packet->tt_num_changes = tt_num_changes;
639 if (vis_server == BATADV_VIS_TYPE_SERVER_SYNC)
640 batadv_ogm_packet->flags |= BATADV_VIS_SERVER;
642 batadv_ogm_packet->flags &= ~BATADV_VIS_SERVER;
644 if (hard_iface == primary_if &&
645 atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_SERVER) {
646 bandwidth = (uint8_t)atomic_read(&bat_priv->gw_bandwidth);
647 batadv_ogm_packet->gw_flags = bandwidth;
649 batadv_ogm_packet->gw_flags = BATADV_NO_FLAGS;
652 batadv_slide_own_bcast_window(hard_iface);
653 batadv_iv_ogm_queue_add(bat_priv, hard_iface->bat_iv.ogm_buff,
654 hard_iface->bat_iv.ogm_buff_len, hard_iface, 1,
655 batadv_iv_ogm_emit_send_time(bat_priv));
658 batadv_hardif_free_ref(primary_if);
662 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
663 struct batadv_orig_node *orig_node,
664 const struct ethhdr *ethhdr,
665 const struct batadv_ogm_packet *batadv_ogm_packet,
666 struct batadv_hard_iface *if_incoming,
667 const unsigned char *tt_buff,
668 enum batadv_dup_status dup_status)
670 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
671 struct batadv_neigh_node *router = NULL;
672 struct batadv_orig_node *orig_node_tmp;
674 uint8_t sum_orig, sum_neigh;
678 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
679 "update_originator(): Searching and updating originator entry of received packet\n");
682 hlist_for_each_entry_rcu(tmp_neigh_node,
683 &orig_node->neigh_list, list) {
684 neigh_addr = tmp_neigh_node->addr;
685 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
686 tmp_neigh_node->if_incoming == if_incoming &&
687 atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
689 batadv_neigh_node_free_ref(neigh_node);
690 neigh_node = tmp_neigh_node;
694 if (dup_status != BATADV_NO_DUP)
697 spin_lock_bh(&tmp_neigh_node->lq_update_lock);
698 batadv_ring_buffer_set(tmp_neigh_node->tq_recv,
699 &tmp_neigh_node->tq_index, 0);
700 tq_avg = batadv_ring_buffer_avg(tmp_neigh_node->tq_recv);
701 tmp_neigh_node->tq_avg = tq_avg;
702 spin_unlock_bh(&tmp_neigh_node->lq_update_lock);
706 struct batadv_orig_node *orig_tmp;
708 orig_tmp = batadv_get_orig_node(bat_priv, ethhdr->h_source);
712 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
715 batadv_ogm_packet->seqno);
717 batadv_orig_node_free_ref(orig_tmp);
721 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
722 "Updating existing last-hop neighbor of originator\n");
726 orig_node->flags = batadv_ogm_packet->flags;
727 neigh_node->last_seen = jiffies;
729 spin_lock_bh(&neigh_node->lq_update_lock);
730 batadv_ring_buffer_set(neigh_node->tq_recv,
731 &neigh_node->tq_index,
732 batadv_ogm_packet->tq);
733 neigh_node->tq_avg = batadv_ring_buffer_avg(neigh_node->tq_recv);
734 spin_unlock_bh(&neigh_node->lq_update_lock);
736 if (dup_status == BATADV_NO_DUP) {
737 orig_node->last_ttl = batadv_ogm_packet->header.ttl;
738 neigh_node->last_ttl = batadv_ogm_packet->header.ttl;
741 batadv_bonding_candidate_add(orig_node, neigh_node);
743 /* if this neighbor already is our next hop there is nothing
746 router = batadv_orig_node_get_router(orig_node);
747 if (router == neigh_node)
750 /* if this neighbor does not offer a better TQ we won't consider it */
751 if (router && (router->tq_avg > neigh_node->tq_avg))
754 /* if the TQ is the same and the link not more symmetric we
755 * won't consider it either
757 if (router && (neigh_node->tq_avg == router->tq_avg)) {
758 orig_node_tmp = router->orig_node;
759 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
760 if_num = router->if_incoming->if_num;
761 sum_orig = orig_node_tmp->bcast_own_sum[if_num];
762 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
764 orig_node_tmp = neigh_node->orig_node;
765 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
766 if_num = neigh_node->if_incoming->if_num;
767 sum_neigh = orig_node_tmp->bcast_own_sum[if_num];
768 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
770 if (sum_orig >= sum_neigh)
774 batadv_update_route(bat_priv, orig_node, neigh_node);
777 /* I have to check for transtable changes only if the OGM has been
778 * sent through a primary interface
780 if (((batadv_ogm_packet->orig != ethhdr->h_source) &&
781 (batadv_ogm_packet->header.ttl > 2)) ||
782 (batadv_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP))
783 batadv_tt_update_orig(bat_priv, orig_node, tt_buff,
784 batadv_ogm_packet->tt_num_changes,
785 batadv_ogm_packet->ttvn,
786 ntohs(batadv_ogm_packet->tt_crc));
788 if (orig_node->gw_flags != batadv_ogm_packet->gw_flags)
789 batadv_gw_node_update(bat_priv, orig_node,
790 batadv_ogm_packet->gw_flags);
792 orig_node->gw_flags = batadv_ogm_packet->gw_flags;
794 /* restart gateway selection if fast or late switching was enabled */
795 if ((orig_node->gw_flags) &&
796 (atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_CLIENT) &&
797 (atomic_read(&bat_priv->gw_sel_class) > 2))
798 batadv_gw_check_election(bat_priv, orig_node);
806 batadv_neigh_node_free_ref(neigh_node);
808 batadv_neigh_node_free_ref(router);
811 static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
812 struct batadv_orig_node *orig_neigh_node,
813 struct batadv_ogm_packet *batadv_ogm_packet,
814 struct batadv_hard_iface *if_incoming)
816 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
817 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
819 uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
820 unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
821 int tq_asym_penalty, inv_asym_penalty, ret = 0;
822 unsigned int combined_tq;
824 /* find corresponding one hop neighbor */
826 hlist_for_each_entry_rcu(tmp_neigh_node,
827 &orig_neigh_node->neigh_list, list) {
828 if (!batadv_compare_eth(tmp_neigh_node->addr,
829 orig_neigh_node->orig))
832 if (tmp_neigh_node->if_incoming != if_incoming)
835 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
838 neigh_node = tmp_neigh_node;
844 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
845 orig_neigh_node->orig,
848 batadv_ogm_packet->seqno);
853 /* if orig_node is direct neighbor update neigh_node last_seen */
854 if (orig_node == orig_neigh_node)
855 neigh_node->last_seen = jiffies;
857 orig_node->last_seen = jiffies;
859 /* find packet count of corresponding one hop neighbor */
860 spin_lock_bh(&orig_node->ogm_cnt_lock);
861 orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];
862 neigh_rq_count = neigh_node->real_packet_count;
863 spin_unlock_bh(&orig_node->ogm_cnt_lock);
865 /* pay attention to not get a value bigger than 100 % */
866 if (orig_eq_count > neigh_rq_count)
867 total_count = neigh_rq_count;
869 total_count = orig_eq_count;
871 /* if we have too few packets (too less data) we set tq_own to zero
872 * if we receive too few packets it is not considered bidirectional
874 if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
875 neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
878 /* neigh_node->real_packet_count is never zero as we
879 * only purge old information when getting new
882 tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count;
884 /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
885 * affect the nearly-symmetric links only a little, but
886 * punishes asymmetric links more. This will give a value
887 * between 0 and TQ_MAX_VALUE
889 neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
890 neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
891 neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
892 BATADV_TQ_LOCAL_WINDOW_SIZE *
893 BATADV_TQ_LOCAL_WINDOW_SIZE;
894 inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
895 inv_asym_penalty /= neigh_rq_max_cube;
896 tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
898 combined_tq = batadv_ogm_packet->tq * tq_own * tq_asym_penalty;
899 combined_tq /= BATADV_TQ_MAX_VALUE * BATADV_TQ_MAX_VALUE;
900 batadv_ogm_packet->tq = combined_tq;
902 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
903 "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n",
904 orig_node->orig, orig_neigh_node->orig, total_count,
905 neigh_rq_count, tq_own,
906 tq_asym_penalty, batadv_ogm_packet->tq);
908 /* if link has the minimum required transmission quality
909 * consider it bidirectional
911 if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
916 batadv_neigh_node_free_ref(neigh_node);
921 * batadv_iv_ogm_update_seqnos - process a batman packet for all interfaces,
922 * adjust the sequence number and find out whether it is a duplicate
923 * @ethhdr: ethernet header of the packet
924 * @batadv_ogm_packet: OGM packet to be considered
925 * @if_incoming: interface on which the OGM packet was received
927 * Returns duplicate status as enum batadv_dup_status
929 static enum batadv_dup_status
930 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
931 const struct batadv_ogm_packet *batadv_ogm_packet,
932 const struct batadv_hard_iface *if_incoming)
934 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
935 struct batadv_orig_node *orig_node;
936 struct batadv_neigh_node *tmp_neigh_node;
941 enum batadv_dup_status ret = BATADV_NO_DUP;
942 uint32_t seqno = ntohl(batadv_ogm_packet->seqno);
944 uint8_t packet_count;
946 orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig);
948 return BATADV_NO_DUP;
950 spin_lock_bh(&orig_node->ogm_cnt_lock);
951 seq_diff = seqno - orig_node->last_real_seqno;
953 /* signalize caller that the packet is to be dropped. */
954 if (!hlist_empty(&orig_node->neigh_list) &&
955 batadv_window_protected(bat_priv, seq_diff,
956 &orig_node->batman_seqno_reset)) {
957 ret = BATADV_PROTECTED;
962 hlist_for_each_entry_rcu(tmp_neigh_node,
963 &orig_node->neigh_list, list) {
964 neigh_addr = tmp_neigh_node->addr;
965 is_dup = batadv_test_bit(tmp_neigh_node->real_bits,
966 orig_node->last_real_seqno,
969 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
970 tmp_neigh_node->if_incoming == if_incoming) {
973 ret = BATADV_NEIGH_DUP;
976 if (is_dup && (ret != BATADV_NEIGH_DUP))
977 ret = BATADV_ORIG_DUP;
980 /* if the window moved, set the update flag. */
981 need_update |= batadv_bit_get_packet(bat_priv,
982 tmp_neigh_node->real_bits,
985 packet_count = bitmap_weight(tmp_neigh_node->real_bits,
986 BATADV_TQ_LOCAL_WINDOW_SIZE);
987 tmp_neigh_node->real_packet_count = packet_count;
992 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
993 "updating last_seqno: old %u, new %u\n",
994 orig_node->last_real_seqno, seqno);
995 orig_node->last_real_seqno = seqno;
999 spin_unlock_bh(&orig_node->ogm_cnt_lock);
1000 batadv_orig_node_free_ref(orig_node);
1004 static void batadv_iv_ogm_process(const struct ethhdr *ethhdr,
1005 struct batadv_ogm_packet *batadv_ogm_packet,
1006 const unsigned char *tt_buff,
1007 struct batadv_hard_iface *if_incoming)
1009 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1010 struct batadv_hard_iface *hard_iface;
1011 struct batadv_orig_node *orig_neigh_node, *orig_node;
1012 struct batadv_neigh_node *router = NULL, *router_router = NULL;
1013 struct batadv_neigh_node *orig_neigh_router = NULL;
1014 int has_directlink_flag;
1015 int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
1016 int is_broadcast = 0, is_bidirect;
1017 bool is_single_hop_neigh = false;
1018 bool is_from_best_next_hop = false;
1019 int sameseq, similar_ttl;
1020 enum batadv_dup_status dup_status;
1021 uint32_t if_incoming_seqno;
1022 uint8_t *prev_sender;
1024 /* Silently drop when the batman packet is actually not a
1027 * This might happen if a packet is padded (e.g. Ethernet has a
1028 * minimum frame length of 64 byte) and the aggregation interprets
1029 * it as an additional length.
1031 * TODO: A more sane solution would be to have a bit in the
1032 * batadv_ogm_packet to detect whether the packet is the last
1033 * packet in an aggregation. Here we expect that the padding
1034 * is always zero (or not 0x01)
1036 if (batadv_ogm_packet->header.packet_type != BATADV_IV_OGM)
1039 /* could be changed by schedule_own_packet() */
1040 if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
1042 if (batadv_ogm_packet->flags & BATADV_DIRECTLINK)
1043 has_directlink_flag = 1;
1045 has_directlink_flag = 0;
1047 if (batadv_compare_eth(ethhdr->h_source, batadv_ogm_packet->orig))
1048 is_single_hop_neigh = true;
1050 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1051 "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",
1052 ethhdr->h_source, if_incoming->net_dev->name,
1053 if_incoming->net_dev->dev_addr, batadv_ogm_packet->orig,
1054 batadv_ogm_packet->prev_sender,
1055 ntohl(batadv_ogm_packet->seqno), batadv_ogm_packet->ttvn,
1056 ntohs(batadv_ogm_packet->tt_crc),
1057 batadv_ogm_packet->tt_num_changes, batadv_ogm_packet->tq,
1058 batadv_ogm_packet->header.ttl,
1059 batadv_ogm_packet->header.version, has_directlink_flag);
1062 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1063 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1066 if (hard_iface->soft_iface != if_incoming->soft_iface)
1069 if (batadv_compare_eth(ethhdr->h_source,
1070 hard_iface->net_dev->dev_addr))
1073 if (batadv_compare_eth(batadv_ogm_packet->orig,
1074 hard_iface->net_dev->dev_addr))
1077 if (batadv_compare_eth(batadv_ogm_packet->prev_sender,
1078 hard_iface->net_dev->dev_addr))
1081 if (is_broadcast_ether_addr(ethhdr->h_source))
1086 if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) {
1087 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1088 "Drop packet: incompatible batman version (%i)\n",
1089 batadv_ogm_packet->header.version);
1094 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1095 "Drop packet: received my own broadcast (sender: %pM)\n",
1101 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1102 "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n",
1108 unsigned long *word;
1114 orig_neigh_node = batadv_get_orig_node(bat_priv,
1116 if (!orig_neigh_node)
1119 /* neighbor has to indicate direct link and it has to
1120 * come via the corresponding interface
1121 * save packet seqno for bidirectional check
1123 if (has_directlink_flag &&
1124 batadv_compare_eth(if_incoming->net_dev->dev_addr,
1125 batadv_ogm_packet->orig)) {
1126 if_num = if_incoming->if_num;
1127 offset = if_num * BATADV_NUM_WORDS;
1129 spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
1130 word = &(orig_neigh_node->bcast_own[offset]);
1131 bit_pos = if_incoming_seqno - 2;
1132 bit_pos -= ntohl(batadv_ogm_packet->seqno);
1133 batadv_set_bit(word, bit_pos);
1134 weight = &orig_neigh_node->bcast_own_sum[if_num];
1135 *weight = bitmap_weight(word,
1136 BATADV_TQ_LOCAL_WINDOW_SIZE);
1137 spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
1140 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1141 "Drop packet: originator packet from myself (via neighbor)\n");
1142 batadv_orig_node_free_ref(orig_neigh_node);
1146 if (is_my_oldorig) {
1147 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1148 "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1153 if (batadv_ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
1154 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1155 "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1160 orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig);
1164 dup_status = batadv_iv_ogm_update_seqnos(ethhdr, batadv_ogm_packet,
1167 if (dup_status == BATADV_PROTECTED) {
1168 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1169 "Drop packet: packet within seqno protection time (sender: %pM)\n",
1174 if (batadv_ogm_packet->tq == 0) {
1175 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1176 "Drop packet: originator packet with tq equal 0\n");
1180 router = batadv_orig_node_get_router(orig_node);
1182 router_router = batadv_orig_node_get_router(router->orig_node);
1184 if ((router && router->tq_avg != 0) &&
1185 (batadv_compare_eth(router->addr, ethhdr->h_source)))
1186 is_from_best_next_hop = true;
1188 prev_sender = batadv_ogm_packet->prev_sender;
1189 /* avoid temporary routing loops */
1190 if (router && router_router &&
1191 (batadv_compare_eth(router->addr, prev_sender)) &&
1192 !(batadv_compare_eth(batadv_ogm_packet->orig, prev_sender)) &&
1193 (batadv_compare_eth(router->addr, router_router->addr))) {
1194 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1195 "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1200 /* if sender is a direct neighbor the sender mac equals
1203 if (is_single_hop_neigh)
1204 orig_neigh_node = orig_node;
1206 orig_neigh_node = batadv_get_orig_node(bat_priv,
1209 if (!orig_neigh_node)
1212 /* Update nc_nodes of the originator */
1213 batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node,
1214 batadv_ogm_packet, is_single_hop_neigh);
1216 orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node);
1218 /* drop packet if sender is not a direct neighbor and if we
1219 * don't route towards it
1221 if (!is_single_hop_neigh && (!orig_neigh_router)) {
1222 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1223 "Drop packet: OGM via unknown neighbor!\n");
1227 is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1228 batadv_ogm_packet, if_incoming);
1230 batadv_bonding_save_primary(orig_node, orig_neigh_node,
1233 /* update ranking if it is not a duplicate or has the same
1234 * seqno and similar ttl as the non-duplicate
1236 sameseq = orig_node->last_real_seqno == ntohl(batadv_ogm_packet->seqno);
1237 similar_ttl = orig_node->last_ttl - 3 <= batadv_ogm_packet->header.ttl;
1238 if (is_bidirect && ((dup_status == BATADV_NO_DUP) ||
1239 (sameseq && similar_ttl)))
1240 batadv_iv_ogm_orig_update(bat_priv, orig_node, ethhdr,
1241 batadv_ogm_packet, if_incoming,
1242 tt_buff, dup_status);
1244 /* is single hop (direct) neighbor */
1245 if (is_single_hop_neigh) {
1246 /* mark direct link on incoming interface */
1247 batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
1248 is_single_hop_neigh,
1249 is_from_best_next_hop, if_incoming);
1251 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1252 "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1256 /* multihop originator */
1258 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1259 "Drop packet: not received via bidirectional link\n");
1263 if (dup_status == BATADV_NEIGH_DUP) {
1264 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1265 "Drop packet: duplicate packet received\n");
1269 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1270 "Forwarding packet: rebroadcast originator packet\n");
1271 batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
1272 is_single_hop_neigh, is_from_best_next_hop,
1276 if ((orig_neigh_node) && (!is_single_hop_neigh))
1277 batadv_orig_node_free_ref(orig_neigh_node);
1280 batadv_neigh_node_free_ref(router);
1282 batadv_neigh_node_free_ref(router_router);
1283 if (orig_neigh_router)
1284 batadv_neigh_node_free_ref(orig_neigh_router);
1286 batadv_orig_node_free_ref(orig_node);
1289 static int batadv_iv_ogm_receive(struct sk_buff *skb,
1290 struct batadv_hard_iface *if_incoming)
1292 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1293 struct batadv_ogm_packet *batadv_ogm_packet;
1294 struct ethhdr *ethhdr;
1295 int buff_pos = 0, packet_len;
1296 unsigned char *tt_buff, *packet_buff;
1298 uint8_t *packet_pos;
1300 ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
1304 /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1305 * that does not have B.A.T.M.A.N. IV enabled ?
1307 if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
1310 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1311 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
1312 skb->len + ETH_HLEN);
1314 packet_len = skb_headlen(skb);
1315 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1316 packet_buff = skb->data;
1317 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
1319 /* unpack the aggregated packets and process them one by one */
1320 while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len,
1321 batadv_ogm_packet->tt_num_changes)) {
1322 tt_buff = packet_buff + buff_pos + BATADV_OGM_HLEN;
1324 batadv_iv_ogm_process(ethhdr, batadv_ogm_packet, tt_buff,
1327 buff_pos += BATADV_OGM_HLEN;
1328 buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes);
1330 packet_pos = packet_buff + buff_pos;
1331 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
1335 return NET_RX_SUCCESS;
1338 static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
1339 .name = "BATMAN_IV",
1340 .bat_iface_enable = batadv_iv_ogm_iface_enable,
1341 .bat_iface_disable = batadv_iv_ogm_iface_disable,
1342 .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
1343 .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
1344 .bat_ogm_schedule = batadv_iv_ogm_schedule,
1345 .bat_ogm_emit = batadv_iv_ogm_emit,
1348 int __init batadv_iv_init(void)
1352 /* batman originator packet */
1353 ret = batadv_recv_handler_register(BATADV_IV_OGM,
1354 batadv_iv_ogm_receive);
1358 ret = batadv_algo_register(&batadv_batman_iv);
1360 goto handler_unregister;
1365 batadv_recv_handler_unregister(BATADV_IV_OGM);