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 "originator.h"
24 #include "gateway_common.h"
25 #include "gateway_client.h"
26 #include "hard-interface.h"
29 #include "network-coding.h"
32 * batadv_ring_buffer_set - update the ring buffer with the given value
33 * @lq_recv: pointer to the ring buffer
34 * @lq_index: index to store the value at
35 * @value: value to store in the ring buffer
37 static void batadv_ring_buffer_set(uint8_t lq_recv[], uint8_t *lq_index,
40 lq_recv[*lq_index] = value;
41 *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE;
45 * batadv_ring_buffer_set - compute the average of all non-zero values stored
46 * in the given ring buffer
47 * @lq_recv: pointer to the ring buffer
49 * Returns computed average value.
51 static uint8_t batadv_ring_buffer_avg(const uint8_t lq_recv[])
54 uint16_t count = 0, i = 0, sum = 0;
58 while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) {
71 return (uint8_t)(sum / count);
73 static struct batadv_neigh_node *
74 batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface,
75 const uint8_t *neigh_addr,
76 struct batadv_orig_node *orig_node,
77 struct batadv_orig_node *orig_neigh)
79 struct batadv_neigh_node *neigh_node;
81 neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr);
85 INIT_LIST_HEAD(&neigh_node->bonding_list);
87 neigh_node->orig_node = orig_neigh;
88 neigh_node->if_incoming = hard_iface;
90 spin_lock_bh(&orig_node->neigh_list_lock);
91 hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
92 spin_unlock_bh(&orig_node->neigh_list_lock);
98 static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
100 struct batadv_ogm_packet *batadv_ogm_packet;
101 unsigned char *ogm_buff;
102 uint32_t random_seqno;
105 /* randomize initial seqno to avoid collision */
106 get_random_bytes(&random_seqno, sizeof(random_seqno));
107 atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno);
109 hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN;
110 ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC);
114 hard_iface->bat_iv.ogm_buff = ogm_buff;
116 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
117 batadv_ogm_packet->header.packet_type = BATADV_IV_OGM;
118 batadv_ogm_packet->header.version = BATADV_COMPAT_VERSION;
119 batadv_ogm_packet->header.ttl = 2;
120 batadv_ogm_packet->flags = BATADV_NO_FLAGS;
121 batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
122 batadv_ogm_packet->tt_num_changes = 0;
123 batadv_ogm_packet->ttvn = 0;
131 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
133 kfree(hard_iface->bat_iv.ogm_buff);
134 hard_iface->bat_iv.ogm_buff = NULL;
137 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
139 struct batadv_ogm_packet *batadv_ogm_packet;
140 unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
142 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
143 memcpy(batadv_ogm_packet->orig,
144 hard_iface->net_dev->dev_addr, ETH_ALEN);
145 memcpy(batadv_ogm_packet->prev_sender,
146 hard_iface->net_dev->dev_addr, ETH_ALEN);
150 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
152 struct batadv_ogm_packet *batadv_ogm_packet;
153 unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
155 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
156 batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP;
157 batadv_ogm_packet->header.ttl = BATADV_TTL;
160 /* when do we schedule our own ogm to be sent */
162 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
166 msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
167 msecs += prandom_u32() % (2 * BATADV_JITTER);
169 return jiffies + msecs_to_jiffies(msecs);
172 /* when do we schedule a ogm packet to be sent */
173 static unsigned long batadv_iv_ogm_fwd_send_time(void)
175 return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2));
178 /* apply hop penalty for a normal link */
179 static uint8_t batadv_hop_penalty(uint8_t tq,
180 const struct batadv_priv *bat_priv)
182 int hop_penalty = atomic_read(&bat_priv->hop_penalty);
185 new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
186 new_tq /= BATADV_TQ_MAX_VALUE;
191 /* is there another aggregated packet here? */
192 static int batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
195 int next_buff_pos = 0;
197 next_buff_pos += buff_pos + BATADV_OGM_HLEN;
198 next_buff_pos += batadv_tt_len(tt_num_changes);
200 return (next_buff_pos <= packet_len) &&
201 (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
204 /* send a batman ogm to a given interface */
205 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
206 struct batadv_hard_iface *hard_iface)
208 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
212 struct batadv_ogm_packet *batadv_ogm_packet;
216 if (hard_iface->if_status != BATADV_IF_ACTIVE)
221 packet_pos = forw_packet->skb->data;
222 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
224 /* adjust all flags and log packets */
225 while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
226 batadv_ogm_packet->tt_num_changes)) {
227 /* we might have aggregated direct link packets with an
228 * ordinary base packet
230 if (forw_packet->direct_link_flags & BIT(packet_num) &&
231 forw_packet->if_incoming == hard_iface)
232 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
234 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
236 if (packet_num > 0 || !forw_packet->own)
237 fwd_str = "Forwarding";
239 fwd_str = "Sending own";
241 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
242 "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n",
243 fwd_str, (packet_num > 0 ? "aggregated " : ""),
244 batadv_ogm_packet->orig,
245 ntohl(batadv_ogm_packet->seqno),
246 batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl,
247 (batadv_ogm_packet->flags & BATADV_DIRECTLINK ?
249 batadv_ogm_packet->ttvn, hard_iface->net_dev->name,
250 hard_iface->net_dev->dev_addr);
252 buff_pos += BATADV_OGM_HLEN;
253 buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes);
255 packet_pos = forw_packet->skb->data + buff_pos;
256 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
259 /* create clone because function is called more than once */
260 skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
262 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
263 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
264 skb->len + ETH_HLEN);
265 batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr);
269 /* send a batman ogm packet */
270 static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
272 struct batadv_hard_iface *hard_iface;
273 struct net_device *soft_iface;
274 struct batadv_priv *bat_priv;
275 struct batadv_hard_iface *primary_if = NULL;
276 struct batadv_ogm_packet *batadv_ogm_packet;
277 unsigned char directlink;
280 packet_pos = forw_packet->skb->data;
281 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
282 directlink = (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0);
284 if (!forw_packet->if_incoming) {
285 pr_err("Error - can't forward packet: incoming iface not specified\n");
289 soft_iface = forw_packet->if_incoming->soft_iface;
290 bat_priv = netdev_priv(soft_iface);
292 if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
295 primary_if = batadv_primary_if_get_selected(bat_priv);
299 /* multihomed peer assumed
300 * non-primary OGMs are only broadcasted on their interface
302 if ((directlink && (batadv_ogm_packet->header.ttl == 1)) ||
303 (forw_packet->own && (forw_packet->if_incoming != primary_if))) {
304 /* FIXME: what about aggregated packets ? */
305 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
306 "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n",
307 (forw_packet->own ? "Sending own" : "Forwarding"),
308 batadv_ogm_packet->orig,
309 ntohl(batadv_ogm_packet->seqno),
310 batadv_ogm_packet->header.ttl,
311 forw_packet->if_incoming->net_dev->name,
312 forw_packet->if_incoming->net_dev->dev_addr);
314 /* skb is only used once and than forw_packet is free'd */
315 batadv_send_skb_packet(forw_packet->skb,
316 forw_packet->if_incoming,
317 batadv_broadcast_addr);
318 forw_packet->skb = NULL;
323 /* broadcast on every interface */
325 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
326 if (hard_iface->soft_iface != soft_iface)
329 batadv_iv_ogm_send_to_if(forw_packet, hard_iface);
335 batadv_hardif_free_ref(primary_if);
338 /* return true if new_packet can be aggregated with forw_packet */
340 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
341 struct batadv_priv *bat_priv,
342 int packet_len, unsigned long send_time,
344 const struct batadv_hard_iface *if_incoming,
345 const struct batadv_forw_packet *forw_packet)
347 struct batadv_ogm_packet *batadv_ogm_packet;
348 int aggregated_bytes = forw_packet->packet_len + packet_len;
349 struct batadv_hard_iface *primary_if = NULL;
351 unsigned long aggregation_end_time;
353 batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
354 aggregation_end_time = send_time;
355 aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
357 /* we can aggregate the current packet to this aggregated packet
360 * - the send time is within our MAX_AGGREGATION_MS time
361 * - the resulting packet wont be bigger than
362 * MAX_AGGREGATION_BYTES
364 if (time_before(send_time, forw_packet->send_time) &&
365 time_after_eq(aggregation_end_time, forw_packet->send_time) &&
366 (aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) {
367 /* check aggregation compatibility
368 * -> direct link packets are broadcasted on
369 * their interface only
370 * -> aggregate packet if the current packet is
371 * a "global" packet as well as the base
374 primary_if = batadv_primary_if_get_selected(bat_priv);
378 /* packets without direct link flag and high TTL
379 * are flooded through the net
382 (!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) &&
383 (batadv_ogm_packet->header.ttl != 1) &&
385 /* own packets originating non-primary
386 * interfaces leave only that interface
388 ((!forw_packet->own) ||
389 (forw_packet->if_incoming == primary_if))) {
394 /* if the incoming packet is sent via this one
395 * interface only - we still can aggregate
398 (new_bat_ogm_packet->header.ttl == 1) &&
399 (forw_packet->if_incoming == if_incoming) &&
401 /* packets from direct neighbors or
402 * own secondary interface packets
403 * (= secondary interface packets in general)
405 (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
407 forw_packet->if_incoming != primary_if))) {
415 batadv_hardif_free_ref(primary_if);
419 /* create a new aggregated packet and add this packet to it */
420 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
421 int packet_len, unsigned long send_time,
423 struct batadv_hard_iface *if_incoming,
426 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
427 struct batadv_forw_packet *forw_packet_aggr;
428 unsigned char *skb_buff;
429 unsigned int skb_size;
431 if (!atomic_inc_not_zero(&if_incoming->refcount))
434 /* own packet should always be scheduled */
436 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
437 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
438 "batman packet queue full\n");
443 forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
444 if (!forw_packet_aggr) {
446 atomic_inc(&bat_priv->batman_queue_left);
450 if ((atomic_read(&bat_priv->aggregated_ogms)) &&
451 (packet_len < BATADV_MAX_AGGREGATION_BYTES))
452 skb_size = BATADV_MAX_AGGREGATION_BYTES;
454 skb_size = packet_len;
456 skb_size += ETH_HLEN;
458 forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size);
459 if (!forw_packet_aggr->skb) {
461 atomic_inc(&bat_priv->batman_queue_left);
462 kfree(forw_packet_aggr);
465 skb_reserve(forw_packet_aggr->skb, ETH_HLEN);
467 INIT_HLIST_NODE(&forw_packet_aggr->list);
469 skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
470 forw_packet_aggr->packet_len = packet_len;
471 memcpy(skb_buff, packet_buff, packet_len);
473 forw_packet_aggr->own = own_packet;
474 forw_packet_aggr->if_incoming = if_incoming;
475 forw_packet_aggr->num_packets = 0;
476 forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
477 forw_packet_aggr->send_time = send_time;
479 /* save packet direct link flag status */
481 forw_packet_aggr->direct_link_flags |= 1;
483 /* add new packet to packet list */
484 spin_lock_bh(&bat_priv->forw_bat_list_lock);
485 hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
486 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
488 /* start timer for this packet */
489 INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
490 batadv_send_outstanding_bat_ogm_packet);
491 queue_delayed_work(batadv_event_workqueue,
492 &forw_packet_aggr->delayed_work,
493 send_time - jiffies);
497 batadv_hardif_free_ref(if_incoming);
500 /* aggregate a new packet into the existing ogm packet */
501 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
502 const unsigned char *packet_buff,
503 int packet_len, bool direct_link)
505 unsigned char *skb_buff;
506 unsigned long new_direct_link_flag;
508 skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
509 memcpy(skb_buff, packet_buff, packet_len);
510 forw_packet_aggr->packet_len += packet_len;
511 forw_packet_aggr->num_packets++;
513 /* save packet direct link flag status */
515 new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
516 forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
520 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
521 unsigned char *packet_buff,
523 struct batadv_hard_iface *if_incoming,
524 int own_packet, unsigned long send_time)
526 /* _aggr -> pointer to the packet we want to aggregate with
527 * _pos -> pointer to the position in the queue
529 struct batadv_forw_packet *forw_packet_aggr = NULL;
530 struct batadv_forw_packet *forw_packet_pos = NULL;
531 struct batadv_ogm_packet *batadv_ogm_packet;
533 unsigned long max_aggregation_jiffies;
535 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
536 direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0;
537 max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
539 /* find position for the packet in the forward queue */
540 spin_lock_bh(&bat_priv->forw_bat_list_lock);
541 /* own packets are not to be aggregated */
542 if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
543 hlist_for_each_entry(forw_packet_pos,
544 &bat_priv->forw_bat_list, list) {
545 if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
546 bat_priv, packet_len,
547 send_time, direct_link,
550 forw_packet_aggr = forw_packet_pos;
556 /* nothing to aggregate with - either aggregation disabled or no
557 * suitable aggregation packet found
559 if (!forw_packet_aggr) {
560 /* the following section can run without the lock */
561 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
563 /* if we could not aggregate this packet with one of the others
564 * we hold it back for a while, so that it might be aggregated
567 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
568 send_time += max_aggregation_jiffies;
570 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
571 send_time, direct_link,
572 if_incoming, own_packet);
574 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
575 packet_len, direct_link);
576 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
580 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
581 const struct ethhdr *ethhdr,
582 struct batadv_ogm_packet *batadv_ogm_packet,
583 bool is_single_hop_neigh,
584 bool is_from_best_next_hop,
585 struct batadv_hard_iface *if_incoming)
587 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
588 uint8_t tt_num_changes;
590 if (batadv_ogm_packet->header.ttl <= 1) {
591 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
595 if (!is_from_best_next_hop) {
596 /* Mark the forwarded packet when it is not coming from our
597 * best next hop. We still need to forward the packet for our
598 * neighbor link quality detection to work in case the packet
599 * originated from a single hop neighbor. Otherwise we can
600 * simply drop the ogm.
602 if (is_single_hop_neigh)
603 batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
608 tt_num_changes = batadv_ogm_packet->tt_num_changes;
610 batadv_ogm_packet->header.ttl--;
611 memcpy(batadv_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
613 /* apply hop penalty */
614 batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
617 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
618 "Forwarding packet: tq: %i, ttl: %i\n",
619 batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl);
621 /* switch of primaries first hop flag when forwarding */
622 batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP;
623 if (is_single_hop_neigh)
624 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
626 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
628 batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
629 BATADV_OGM_HLEN + batadv_tt_len(tt_num_changes),
630 if_incoming, 0, batadv_iv_ogm_fwd_send_time());
634 * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for
635 * the given interface
636 * @hard_iface: the interface for which the windows have to be shifted
639 batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface)
641 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
642 struct batadv_hashtable *hash = bat_priv->orig_hash;
643 struct hlist_head *head;
644 struct batadv_orig_node *orig_node;
650 for (i = 0; i < hash->size; i++) {
651 head = &hash->table[i];
654 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
655 spin_lock_bh(&orig_node->ogm_cnt_lock);
656 word_index = hard_iface->if_num * BATADV_NUM_WORDS;
657 word = &(orig_node->bcast_own[word_index]);
659 batadv_bit_get_packet(bat_priv, word, 1, 0);
660 w = &orig_node->bcast_own_sum[hard_iface->if_num];
661 *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE);
662 spin_unlock_bh(&orig_node->ogm_cnt_lock);
668 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
670 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
671 unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
672 struct batadv_ogm_packet *batadv_ogm_packet;
673 struct batadv_hard_iface *primary_if;
674 int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
675 int vis_server, tt_num_changes = 0;
679 vis_server = atomic_read(&bat_priv->vis_mode);
680 primary_if = batadv_primary_if_get_selected(bat_priv);
682 if (hard_iface == primary_if)
683 tt_num_changes = batadv_tt_append_diff(bat_priv, ogm_buff,
687 batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
689 /* change sequence number to network order */
690 seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno);
691 batadv_ogm_packet->seqno = htonl(seqno);
692 atomic_inc(&hard_iface->bat_iv.ogm_seqno);
694 batadv_ogm_packet->ttvn = atomic_read(&bat_priv->tt.vn);
695 batadv_ogm_packet->tt_crc = htons(bat_priv->tt.local_crc);
696 if (tt_num_changes >= 0)
697 batadv_ogm_packet->tt_num_changes = tt_num_changes;
699 if (vis_server == BATADV_VIS_TYPE_SERVER_SYNC)
700 batadv_ogm_packet->flags |= BATADV_VIS_SERVER;
702 batadv_ogm_packet->flags &= ~BATADV_VIS_SERVER;
704 if (hard_iface == primary_if &&
705 atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_SERVER) {
706 bandwidth = (uint8_t)atomic_read(&bat_priv->gw_bandwidth);
707 batadv_ogm_packet->gw_flags = bandwidth;
709 batadv_ogm_packet->gw_flags = BATADV_NO_FLAGS;
712 batadv_iv_ogm_slide_own_bcast_window(hard_iface);
713 batadv_iv_ogm_queue_add(bat_priv, hard_iface->bat_iv.ogm_buff,
714 hard_iface->bat_iv.ogm_buff_len, hard_iface, 1,
715 batadv_iv_ogm_emit_send_time(bat_priv));
718 batadv_hardif_free_ref(primary_if);
722 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
723 struct batadv_orig_node *orig_node,
724 const struct ethhdr *ethhdr,
725 const struct batadv_ogm_packet *batadv_ogm_packet,
726 struct batadv_hard_iface *if_incoming,
727 const unsigned char *tt_buff,
730 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
731 struct batadv_neigh_node *router = NULL;
732 struct batadv_orig_node *orig_node_tmp;
734 uint8_t sum_orig, sum_neigh;
738 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
739 "update_originator(): Searching and updating originator entry of received packet\n");
742 hlist_for_each_entry_rcu(tmp_neigh_node,
743 &orig_node->neigh_list, list) {
744 neigh_addr = tmp_neigh_node->addr;
745 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
746 tmp_neigh_node->if_incoming == if_incoming &&
747 atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
748 if (WARN(neigh_node, "too many matching neigh_nodes"))
749 batadv_neigh_node_free_ref(neigh_node);
750 neigh_node = tmp_neigh_node;
757 spin_lock_bh(&tmp_neigh_node->lq_update_lock);
758 batadv_ring_buffer_set(tmp_neigh_node->tq_recv,
759 &tmp_neigh_node->tq_index, 0);
760 tq_avg = batadv_ring_buffer_avg(tmp_neigh_node->tq_recv);
761 tmp_neigh_node->tq_avg = tq_avg;
762 spin_unlock_bh(&tmp_neigh_node->lq_update_lock);
766 struct batadv_orig_node *orig_tmp;
768 orig_tmp = batadv_get_orig_node(bat_priv, ethhdr->h_source);
772 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
774 orig_node, orig_tmp);
776 batadv_orig_node_free_ref(orig_tmp);
780 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
781 "Updating existing last-hop neighbor of originator\n");
785 orig_node->flags = batadv_ogm_packet->flags;
786 neigh_node->last_seen = jiffies;
788 spin_lock_bh(&neigh_node->lq_update_lock);
789 batadv_ring_buffer_set(neigh_node->tq_recv,
790 &neigh_node->tq_index,
791 batadv_ogm_packet->tq);
792 neigh_node->tq_avg = batadv_ring_buffer_avg(neigh_node->tq_recv);
793 spin_unlock_bh(&neigh_node->lq_update_lock);
796 orig_node->last_ttl = batadv_ogm_packet->header.ttl;
797 neigh_node->last_ttl = batadv_ogm_packet->header.ttl;
800 batadv_bonding_candidate_add(orig_node, neigh_node);
802 /* if this neighbor already is our next hop there is nothing
805 router = batadv_orig_node_get_router(orig_node);
806 if (router == neigh_node)
809 /* if this neighbor does not offer a better TQ we won't consider it */
810 if (router && (router->tq_avg > neigh_node->tq_avg))
813 /* if the TQ is the same and the link not more symmetric we
814 * won't consider it either
816 if (router && (neigh_node->tq_avg == router->tq_avg)) {
817 orig_node_tmp = router->orig_node;
818 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
819 if_num = router->if_incoming->if_num;
820 sum_orig = orig_node_tmp->bcast_own_sum[if_num];
821 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
823 orig_node_tmp = neigh_node->orig_node;
824 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
825 if_num = neigh_node->if_incoming->if_num;
826 sum_neigh = orig_node_tmp->bcast_own_sum[if_num];
827 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
829 if (sum_orig >= sum_neigh)
833 batadv_update_route(bat_priv, orig_node, neigh_node);
836 /* I have to check for transtable changes only if the OGM has been
837 * sent through a primary interface
839 if (((batadv_ogm_packet->orig != ethhdr->h_source) &&
840 (batadv_ogm_packet->header.ttl > 2)) ||
841 (batadv_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP))
842 batadv_tt_update_orig(bat_priv, orig_node, tt_buff,
843 batadv_ogm_packet->tt_num_changes,
844 batadv_ogm_packet->ttvn,
845 ntohs(batadv_ogm_packet->tt_crc));
847 if (orig_node->gw_flags != batadv_ogm_packet->gw_flags)
848 batadv_gw_node_update(bat_priv, orig_node,
849 batadv_ogm_packet->gw_flags);
851 orig_node->gw_flags = batadv_ogm_packet->gw_flags;
853 /* restart gateway selection if fast or late switching was enabled */
854 if ((orig_node->gw_flags) &&
855 (atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_CLIENT) &&
856 (atomic_read(&bat_priv->gw_sel_class) > 2))
857 batadv_gw_check_election(bat_priv, orig_node);
865 batadv_neigh_node_free_ref(neigh_node);
867 batadv_neigh_node_free_ref(router);
870 static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
871 struct batadv_orig_node *orig_neigh_node,
872 struct batadv_ogm_packet *batadv_ogm_packet,
873 struct batadv_hard_iface *if_incoming)
875 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
876 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
878 uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
879 unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
880 int tq_asym_penalty, inv_asym_penalty, ret = 0;
881 unsigned int combined_tq;
883 /* find corresponding one hop neighbor */
885 hlist_for_each_entry_rcu(tmp_neigh_node,
886 &orig_neigh_node->neigh_list, list) {
887 if (!batadv_compare_eth(tmp_neigh_node->addr,
888 orig_neigh_node->orig))
891 if (tmp_neigh_node->if_incoming != if_incoming)
894 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
897 neigh_node = tmp_neigh_node;
903 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
904 orig_neigh_node->orig,
911 /* if orig_node is direct neighbor update neigh_node last_seen */
912 if (orig_node == orig_neigh_node)
913 neigh_node->last_seen = jiffies;
915 orig_node->last_seen = jiffies;
917 /* find packet count of corresponding one hop neighbor */
918 spin_lock_bh(&orig_node->ogm_cnt_lock);
919 orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];
920 neigh_rq_count = neigh_node->real_packet_count;
921 spin_unlock_bh(&orig_node->ogm_cnt_lock);
923 /* pay attention to not get a value bigger than 100 % */
924 if (orig_eq_count > neigh_rq_count)
925 total_count = neigh_rq_count;
927 total_count = orig_eq_count;
929 /* if we have too few packets (too less data) we set tq_own to zero
930 * if we receive too few packets it is not considered bidirectional
932 if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
933 neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
936 /* neigh_node->real_packet_count is never zero as we
937 * only purge old information when getting new
940 tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count;
942 /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
943 * affect the nearly-symmetric links only a little, but
944 * punishes asymmetric links more. This will give a value
945 * between 0 and TQ_MAX_VALUE
947 neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
948 neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
949 neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
950 BATADV_TQ_LOCAL_WINDOW_SIZE *
951 BATADV_TQ_LOCAL_WINDOW_SIZE;
952 inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
953 inv_asym_penalty /= neigh_rq_max_cube;
954 tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
956 combined_tq = batadv_ogm_packet->tq * tq_own * tq_asym_penalty;
957 combined_tq /= BATADV_TQ_MAX_VALUE * BATADV_TQ_MAX_VALUE;
958 batadv_ogm_packet->tq = combined_tq;
960 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
961 "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n",
962 orig_node->orig, orig_neigh_node->orig, total_count,
963 neigh_rq_count, tq_own,
964 tq_asym_penalty, batadv_ogm_packet->tq);
966 /* if link has the minimum required transmission quality
967 * consider it bidirectional
969 if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
974 batadv_neigh_node_free_ref(neigh_node);
978 /* processes a batman packet for all interfaces, adjusts the sequence number and
979 * finds out whether it is a duplicate.
981 * 1 the packet is a duplicate
982 * 0 the packet has not yet been received
983 * -1 the packet is old and has been received while the seqno window
984 * was protected. Caller should drop it.
987 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
988 const struct batadv_ogm_packet *batadv_ogm_packet,
989 const struct batadv_hard_iface *if_incoming)
991 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
992 struct batadv_orig_node *orig_node;
993 struct batadv_neigh_node *tmp_neigh_node;
994 int is_duplicate = 0;
997 int set_mark, ret = -1;
998 uint32_t seqno = ntohl(batadv_ogm_packet->seqno);
1000 uint8_t packet_count;
1002 orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig);
1006 spin_lock_bh(&orig_node->ogm_cnt_lock);
1007 seq_diff = seqno - orig_node->last_real_seqno;
1009 /* signalize caller that the packet is to be dropped. */
1010 if (!hlist_empty(&orig_node->neigh_list) &&
1011 batadv_window_protected(bat_priv, seq_diff,
1012 &orig_node->batman_seqno_reset))
1016 hlist_for_each_entry_rcu(tmp_neigh_node,
1017 &orig_node->neigh_list, list) {
1018 is_duplicate |= batadv_test_bit(tmp_neigh_node->real_bits,
1019 orig_node->last_real_seqno,
1022 neigh_addr = tmp_neigh_node->addr;
1023 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1024 tmp_neigh_node->if_incoming == if_incoming)
1029 /* if the window moved, set the update flag. */
1030 need_update |= batadv_bit_get_packet(bat_priv,
1031 tmp_neigh_node->real_bits,
1032 seq_diff, set_mark);
1034 packet_count = bitmap_weight(tmp_neigh_node->real_bits,
1035 BATADV_TQ_LOCAL_WINDOW_SIZE);
1036 tmp_neigh_node->real_packet_count = packet_count;
1041 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1042 "updating last_seqno: old %u, new %u\n",
1043 orig_node->last_real_seqno, seqno);
1044 orig_node->last_real_seqno = seqno;
1050 spin_unlock_bh(&orig_node->ogm_cnt_lock);
1051 batadv_orig_node_free_ref(orig_node);
1055 static void batadv_iv_ogm_process(const struct ethhdr *ethhdr,
1056 struct batadv_ogm_packet *batadv_ogm_packet,
1057 const unsigned char *tt_buff,
1058 struct batadv_hard_iface *if_incoming)
1060 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1061 struct batadv_hard_iface *hard_iface;
1062 struct batadv_orig_node *orig_neigh_node, *orig_node;
1063 struct batadv_neigh_node *router = NULL, *router_router = NULL;
1064 struct batadv_neigh_node *orig_neigh_router = NULL;
1065 int has_directlink_flag;
1066 int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
1068 bool is_single_hop_neigh = false;
1069 bool is_from_best_next_hop = false;
1070 int is_duplicate, sameseq, simlar_ttl;
1071 uint32_t if_incoming_seqno;
1072 uint8_t *prev_sender;
1074 /* Silently drop when the batman packet is actually not a
1077 * This might happen if a packet is padded (e.g. Ethernet has a
1078 * minimum frame length of 64 byte) and the aggregation interprets
1079 * it as an additional length.
1081 * TODO: A more sane solution would be to have a bit in the
1082 * batadv_ogm_packet to detect whether the packet is the last
1083 * packet in an aggregation. Here we expect that the padding
1084 * is always zero (or not 0x01)
1086 if (batadv_ogm_packet->header.packet_type != BATADV_IV_OGM)
1089 /* could be changed by schedule_own_packet() */
1090 if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
1092 if (batadv_ogm_packet->flags & BATADV_DIRECTLINK)
1093 has_directlink_flag = 1;
1095 has_directlink_flag = 0;
1097 if (batadv_compare_eth(ethhdr->h_source, batadv_ogm_packet->orig))
1098 is_single_hop_neigh = true;
1100 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1101 "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",
1102 ethhdr->h_source, if_incoming->net_dev->name,
1103 if_incoming->net_dev->dev_addr, batadv_ogm_packet->orig,
1104 batadv_ogm_packet->prev_sender,
1105 ntohl(batadv_ogm_packet->seqno), batadv_ogm_packet->ttvn,
1106 ntohs(batadv_ogm_packet->tt_crc),
1107 batadv_ogm_packet->tt_num_changes, batadv_ogm_packet->tq,
1108 batadv_ogm_packet->header.ttl,
1109 batadv_ogm_packet->header.version, has_directlink_flag);
1112 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1113 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1116 if (hard_iface->soft_iface != if_incoming->soft_iface)
1119 if (batadv_compare_eth(ethhdr->h_source,
1120 hard_iface->net_dev->dev_addr))
1123 if (batadv_compare_eth(batadv_ogm_packet->orig,
1124 hard_iface->net_dev->dev_addr))
1127 if (batadv_compare_eth(batadv_ogm_packet->prev_sender,
1128 hard_iface->net_dev->dev_addr))
1134 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1135 "Drop packet: received my own broadcast (sender: %pM)\n",
1141 unsigned long *word;
1147 orig_neigh_node = batadv_get_orig_node(bat_priv,
1149 if (!orig_neigh_node)
1152 /* neighbor has to indicate direct link and it has to
1153 * come via the corresponding interface
1154 * save packet seqno for bidirectional check
1156 if (has_directlink_flag &&
1157 batadv_compare_eth(if_incoming->net_dev->dev_addr,
1158 batadv_ogm_packet->orig)) {
1159 if_num = if_incoming->if_num;
1160 offset = if_num * BATADV_NUM_WORDS;
1162 spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
1163 word = &(orig_neigh_node->bcast_own[offset]);
1164 bit_pos = if_incoming_seqno - 2;
1165 bit_pos -= ntohl(batadv_ogm_packet->seqno);
1166 batadv_set_bit(word, bit_pos);
1167 weight = &orig_neigh_node->bcast_own_sum[if_num];
1168 *weight = bitmap_weight(word,
1169 BATADV_TQ_LOCAL_WINDOW_SIZE);
1170 spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
1173 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1174 "Drop packet: originator packet from myself (via neighbor)\n");
1175 batadv_orig_node_free_ref(orig_neigh_node);
1179 if (is_my_oldorig) {
1180 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1181 "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1186 if (batadv_ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
1187 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1188 "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1193 orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig);
1197 is_duplicate = batadv_iv_ogm_update_seqnos(ethhdr, batadv_ogm_packet,
1200 if (is_duplicate == -1) {
1201 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1202 "Drop packet: packet within seqno protection time (sender: %pM)\n",
1207 if (batadv_ogm_packet->tq == 0) {
1208 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1209 "Drop packet: originator packet with tq equal 0\n");
1213 router = batadv_orig_node_get_router(orig_node);
1215 router_router = batadv_orig_node_get_router(router->orig_node);
1217 if ((router && router->tq_avg != 0) &&
1218 (batadv_compare_eth(router->addr, ethhdr->h_source)))
1219 is_from_best_next_hop = true;
1221 prev_sender = batadv_ogm_packet->prev_sender;
1222 /* avoid temporary routing loops */
1223 if (router && router_router &&
1224 (batadv_compare_eth(router->addr, prev_sender)) &&
1225 !(batadv_compare_eth(batadv_ogm_packet->orig, prev_sender)) &&
1226 (batadv_compare_eth(router->addr, router_router->addr))) {
1227 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1228 "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1233 /* if sender is a direct neighbor the sender mac equals
1236 if (is_single_hop_neigh)
1237 orig_neigh_node = orig_node;
1239 orig_neigh_node = batadv_get_orig_node(bat_priv,
1242 if (!orig_neigh_node)
1245 /* Update nc_nodes of the originator */
1246 batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node,
1247 batadv_ogm_packet, is_single_hop_neigh);
1249 orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node);
1251 /* drop packet if sender is not a direct neighbor and if we
1252 * don't route towards it
1254 if (!is_single_hop_neigh && (!orig_neigh_router)) {
1255 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1256 "Drop packet: OGM via unknown neighbor!\n");
1260 is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1261 batadv_ogm_packet, if_incoming);
1263 batadv_bonding_save_primary(orig_node, orig_neigh_node,
1266 /* update ranking if it is not a duplicate or has the same
1267 * seqno and similar ttl as the non-duplicate
1269 sameseq = orig_node->last_real_seqno == ntohl(batadv_ogm_packet->seqno);
1270 simlar_ttl = orig_node->last_ttl - 3 <= batadv_ogm_packet->header.ttl;
1271 if (is_bidirect && (!is_duplicate || (sameseq && simlar_ttl)))
1272 batadv_iv_ogm_orig_update(bat_priv, orig_node, ethhdr,
1273 batadv_ogm_packet, if_incoming,
1274 tt_buff, is_duplicate);
1276 /* is single hop (direct) neighbor */
1277 if (is_single_hop_neigh) {
1278 /* mark direct link on incoming interface */
1279 batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
1280 is_single_hop_neigh,
1281 is_from_best_next_hop, if_incoming);
1283 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1284 "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1288 /* multihop originator */
1290 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1291 "Drop packet: not received via bidirectional link\n");
1296 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1297 "Drop packet: duplicate packet received\n");
1301 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1302 "Forwarding packet: rebroadcast originator packet\n");
1303 batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
1304 is_single_hop_neigh, is_from_best_next_hop,
1308 if ((orig_neigh_node) && (!is_single_hop_neigh))
1309 batadv_orig_node_free_ref(orig_neigh_node);
1312 batadv_neigh_node_free_ref(router);
1314 batadv_neigh_node_free_ref(router_router);
1315 if (orig_neigh_router)
1316 batadv_neigh_node_free_ref(orig_neigh_router);
1318 batadv_orig_node_free_ref(orig_node);
1321 static int batadv_iv_ogm_receive(struct sk_buff *skb,
1322 struct batadv_hard_iface *if_incoming)
1324 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1325 struct batadv_ogm_packet *batadv_ogm_packet;
1326 struct ethhdr *ethhdr;
1327 int buff_pos = 0, packet_len;
1328 unsigned char *tt_buff, *packet_buff;
1330 uint8_t *packet_pos;
1332 ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
1336 /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1337 * that does not have B.A.T.M.A.N. IV enabled ?
1339 if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
1342 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1343 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
1344 skb->len + ETH_HLEN);
1346 packet_len = skb_headlen(skb);
1347 ethhdr = eth_hdr(skb);
1348 packet_buff = skb->data;
1349 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
1351 /* unpack the aggregated packets and process them one by one */
1352 while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len,
1353 batadv_ogm_packet->tt_num_changes)) {
1354 tt_buff = packet_buff + buff_pos + BATADV_OGM_HLEN;
1356 batadv_iv_ogm_process(ethhdr, batadv_ogm_packet, tt_buff,
1359 buff_pos += BATADV_OGM_HLEN;
1360 buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes);
1362 packet_pos = packet_buff + buff_pos;
1363 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
1367 return NET_RX_SUCCESS;
1370 static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
1371 .name = "BATMAN_IV",
1372 .bat_iface_enable = batadv_iv_ogm_iface_enable,
1373 .bat_iface_disable = batadv_iv_ogm_iface_disable,
1374 .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
1375 .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
1376 .bat_ogm_schedule = batadv_iv_ogm_schedule,
1377 .bat_ogm_emit = batadv_iv_ogm_emit,
1380 int __init batadv_iv_init(void)
1384 /* batman originator packet */
1385 ret = batadv_recv_handler_register(BATADV_IV_OGM,
1386 batadv_iv_ogm_receive);
1390 ret = batadv_algo_register(&batadv_batman_iv);
1392 goto handler_unregister;
1397 batadv_recv_handler_unregister(BATADV_IV_OGM);