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, see <http://www.gnu.org/licenses/>.
19 #include "translation-table.h"
20 #include "originator.h"
22 #include "gateway_common.h"
23 #include "gateway_client.h"
24 #include "hard-interface.h"
27 #include "network-coding.h"
31 * batadv_dup_status - duplicate status
32 * @BATADV_NO_DUP: the packet is a duplicate
33 * @BATADV_ORIG_DUP: OGM is a duplicate in the originator (but not for the
35 * @BATADV_NEIGH_DUP: OGM is a duplicate for the neighbor
36 * @BATADV_PROTECTED: originator is currently protected (after reboot)
38 enum batadv_dup_status {
46 * batadv_ring_buffer_set - update the ring buffer with the given value
47 * @lq_recv: pointer to the ring buffer
48 * @lq_index: index to store the value at
49 * @value: value to store in the ring buffer
51 static void batadv_ring_buffer_set(uint8_t lq_recv[], uint8_t *lq_index,
54 lq_recv[*lq_index] = value;
55 *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE;
59 * batadv_ring_buffer_set - compute the average of all non-zero values stored
60 * in the given ring buffer
61 * @lq_recv: pointer to the ring buffer
63 * Returns computed average value.
65 static uint8_t batadv_ring_buffer_avg(const uint8_t lq_recv[])
68 uint16_t count = 0, i = 0, sum = 0;
72 while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) {
85 return (uint8_t)(sum / count);
89 * batadv_iv_ogm_orig_free - free the private resources allocated for this
91 * @orig_node: the orig_node for which the resources have to be free'd
93 static void batadv_iv_ogm_orig_free(struct batadv_orig_node *orig_node)
95 kfree(orig_node->bat_iv.bcast_own);
96 kfree(orig_node->bat_iv.bcast_own_sum);
100 * batadv_iv_ogm_orig_add_if - change the private structures of the orig_node to
101 * include the new hard-interface
102 * @orig_node: the orig_node that has to be changed
103 * @max_if_num: the current amount of interfaces
105 * Returns 0 on success, a negative error code otherwise.
107 static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node *orig_node,
111 size_t data_size, old_size;
114 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
116 data_size = max_if_num * sizeof(unsigned long) * BATADV_NUM_WORDS;
117 old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS;
118 data_ptr = kmalloc(data_size, GFP_ATOMIC);
122 memcpy(data_ptr, orig_node->bat_iv.bcast_own, old_size);
123 kfree(orig_node->bat_iv.bcast_own);
124 orig_node->bat_iv.bcast_own = data_ptr;
126 data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC);
128 kfree(orig_node->bat_iv.bcast_own);
132 memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum,
133 (max_if_num - 1) * sizeof(uint8_t));
134 kfree(orig_node->bat_iv.bcast_own_sum);
135 orig_node->bat_iv.bcast_own_sum = data_ptr;
140 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
146 * batadv_iv_ogm_orig_del_if - change the private structures of the orig_node to
147 * exclude the removed interface
148 * @orig_node: the orig_node that has to be changed
149 * @max_if_num: the current amount of interfaces
150 * @del_if_num: the index of the interface being removed
152 * Returns 0 on success, a negative error code otherwise.
154 static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node,
155 int max_if_num, int del_if_num)
157 int chunk_size, ret = -ENOMEM, if_offset;
158 void *data_ptr = NULL;
160 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
162 /* last interface was removed */
166 chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS;
167 data_ptr = kmalloc(max_if_num * chunk_size, GFP_ATOMIC);
171 /* copy first part */
172 memcpy(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size);
174 /* copy second part */
175 memcpy((char *)data_ptr + del_if_num * chunk_size,
176 orig_node->bat_iv.bcast_own + ((del_if_num + 1) * chunk_size),
177 (max_if_num - del_if_num) * chunk_size);
180 kfree(orig_node->bat_iv.bcast_own);
181 orig_node->bat_iv.bcast_own = data_ptr;
186 data_ptr = kmalloc(max_if_num * sizeof(uint8_t), GFP_ATOMIC);
188 kfree(orig_node->bat_iv.bcast_own);
192 memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum,
193 del_if_num * sizeof(uint8_t));
195 if_offset = (del_if_num + 1) * sizeof(uint8_t);
196 memcpy((char *)data_ptr + del_if_num * sizeof(uint8_t),
197 orig_node->bat_iv.bcast_own_sum + if_offset,
198 (max_if_num - del_if_num) * sizeof(uint8_t));
201 kfree(orig_node->bat_iv.bcast_own_sum);
202 orig_node->bat_iv.bcast_own_sum = data_ptr;
206 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
212 * batadv_iv_ogm_orig_get - retrieve or create (if does not exist) an originator
213 * @bat_priv: the bat priv with all the soft interface information
214 * @addr: mac address of the originator
216 * Returns the originator object corresponding to the passed mac address or NULL
218 * If the object does not exists it is created an initialised.
220 static struct batadv_orig_node *
221 batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const uint8_t *addr)
223 struct batadv_orig_node *orig_node;
224 int size, hash_added;
226 orig_node = batadv_orig_hash_find(bat_priv, addr);
230 orig_node = batadv_orig_node_new(bat_priv, addr);
234 spin_lock_init(&orig_node->bat_iv.ogm_cnt_lock);
236 size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS;
237 orig_node->bat_iv.bcast_own = kzalloc(size, GFP_ATOMIC);
238 if (!orig_node->bat_iv.bcast_own)
241 size = bat_priv->num_ifaces * sizeof(uint8_t);
242 orig_node->bat_iv.bcast_own_sum = kzalloc(size, GFP_ATOMIC);
243 if (!orig_node->bat_iv.bcast_own_sum)
246 hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig,
247 batadv_choose_orig, orig_node,
248 &orig_node->hash_entry);
255 kfree(orig_node->bat_iv.bcast_own);
257 batadv_orig_node_free_ref(orig_node);
262 static struct batadv_neigh_node *
263 batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface,
264 const uint8_t *neigh_addr,
265 struct batadv_orig_node *orig_node,
266 struct batadv_orig_node *orig_neigh)
268 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
269 struct batadv_neigh_node *neigh_node;
271 neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr, orig_node);
275 spin_lock_init(&neigh_node->bat_iv.lq_update_lock);
277 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
278 "Creating new neighbor %pM for orig_node %pM on interface %s\n",
279 neigh_addr, orig_node->orig, hard_iface->net_dev->name);
281 spin_lock_bh(&orig_node->neigh_list_lock);
282 hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
283 spin_unlock_bh(&orig_node->neigh_list_lock);
289 static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
291 struct batadv_ogm_packet *batadv_ogm_packet;
292 unsigned char *ogm_buff;
293 uint32_t random_seqno;
296 /* randomize initial seqno to avoid collision */
297 get_random_bytes(&random_seqno, sizeof(random_seqno));
298 atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno);
300 hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN;
301 ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC);
305 hard_iface->bat_iv.ogm_buff = ogm_buff;
307 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
308 batadv_ogm_packet->packet_type = BATADV_IV_OGM;
309 batadv_ogm_packet->version = BATADV_COMPAT_VERSION;
310 batadv_ogm_packet->ttl = 2;
311 batadv_ogm_packet->flags = BATADV_NO_FLAGS;
312 batadv_ogm_packet->reserved = 0;
313 batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
321 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
323 kfree(hard_iface->bat_iv.ogm_buff);
324 hard_iface->bat_iv.ogm_buff = NULL;
327 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
329 struct batadv_ogm_packet *batadv_ogm_packet;
330 unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
332 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
333 memcpy(batadv_ogm_packet->orig,
334 hard_iface->net_dev->dev_addr, ETH_ALEN);
335 memcpy(batadv_ogm_packet->prev_sender,
336 hard_iface->net_dev->dev_addr, ETH_ALEN);
340 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
342 struct batadv_ogm_packet *batadv_ogm_packet;
343 unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
345 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
346 batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP;
347 batadv_ogm_packet->ttl = BATADV_TTL;
350 /* when do we schedule our own ogm to be sent */
352 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
356 msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
357 msecs += prandom_u32() % (2 * BATADV_JITTER);
359 return jiffies + msecs_to_jiffies(msecs);
362 /* when do we schedule a ogm packet to be sent */
363 static unsigned long batadv_iv_ogm_fwd_send_time(void)
365 return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2));
368 /* apply hop penalty for a normal link */
369 static uint8_t batadv_hop_penalty(uint8_t tq,
370 const struct batadv_priv *bat_priv)
372 int hop_penalty = atomic_read(&bat_priv->hop_penalty);
375 new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
376 new_tq /= BATADV_TQ_MAX_VALUE;
381 /* is there another aggregated packet here? */
382 static int batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
385 int next_buff_pos = 0;
387 next_buff_pos += buff_pos + BATADV_OGM_HLEN;
388 next_buff_pos += ntohs(tvlv_len);
390 return (next_buff_pos <= packet_len) &&
391 (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
394 /* send a batman ogm to a given interface */
395 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
396 struct batadv_hard_iface *hard_iface)
398 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
402 struct batadv_ogm_packet *batadv_ogm_packet;
406 if (hard_iface->if_status != BATADV_IF_ACTIVE)
411 packet_pos = forw_packet->skb->data;
412 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
414 /* adjust all flags and log packets */
415 while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
416 batadv_ogm_packet->tvlv_len)) {
417 /* we might have aggregated direct link packets with an
418 * ordinary base packet
420 if (forw_packet->direct_link_flags & BIT(packet_num) &&
421 forw_packet->if_incoming == hard_iface)
422 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
424 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
426 if (packet_num > 0 || !forw_packet->own)
427 fwd_str = "Forwarding";
429 fwd_str = "Sending own";
431 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
432 "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n",
433 fwd_str, (packet_num > 0 ? "aggregated " : ""),
434 batadv_ogm_packet->orig,
435 ntohl(batadv_ogm_packet->seqno),
436 batadv_ogm_packet->tq, batadv_ogm_packet->ttl,
437 (batadv_ogm_packet->flags & BATADV_DIRECTLINK ?
439 hard_iface->net_dev->name,
440 hard_iface->net_dev->dev_addr);
442 buff_pos += BATADV_OGM_HLEN;
443 buff_pos += ntohs(batadv_ogm_packet->tvlv_len);
445 packet_pos = forw_packet->skb->data + buff_pos;
446 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
449 /* create clone because function is called more than once */
450 skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
452 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
453 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
454 skb->len + ETH_HLEN);
455 batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr);
459 /* send a batman ogm packet */
460 static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
462 struct batadv_hard_iface *hard_iface;
463 struct net_device *soft_iface;
464 struct batadv_priv *bat_priv;
465 struct batadv_hard_iface *primary_if = NULL;
466 struct batadv_ogm_packet *batadv_ogm_packet;
467 unsigned char directlink;
470 packet_pos = forw_packet->skb->data;
471 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
472 directlink = (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0);
474 if (!forw_packet->if_incoming) {
475 pr_err("Error - can't forward packet: incoming iface not specified\n");
479 soft_iface = forw_packet->if_incoming->soft_iface;
480 bat_priv = netdev_priv(soft_iface);
482 if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
485 primary_if = batadv_primary_if_get_selected(bat_priv);
489 /* multihomed peer assumed
490 * non-primary OGMs are only broadcasted on their interface
492 if ((directlink && (batadv_ogm_packet->ttl == 1)) ||
493 (forw_packet->own && (forw_packet->if_incoming != primary_if))) {
494 /* FIXME: what about aggregated packets ? */
495 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
496 "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n",
497 (forw_packet->own ? "Sending own" : "Forwarding"),
498 batadv_ogm_packet->orig,
499 ntohl(batadv_ogm_packet->seqno),
500 batadv_ogm_packet->ttl,
501 forw_packet->if_incoming->net_dev->name,
502 forw_packet->if_incoming->net_dev->dev_addr);
504 /* skb is only used once and than forw_packet is free'd */
505 batadv_send_skb_packet(forw_packet->skb,
506 forw_packet->if_incoming,
507 batadv_broadcast_addr);
508 forw_packet->skb = NULL;
513 /* broadcast on every interface */
515 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
516 if (hard_iface->soft_iface != soft_iface)
519 batadv_iv_ogm_send_to_if(forw_packet, hard_iface);
525 batadv_hardif_free_ref(primary_if);
528 /* return true if new_packet can be aggregated with forw_packet */
530 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
531 struct batadv_priv *bat_priv,
532 int packet_len, unsigned long send_time,
534 const struct batadv_hard_iface *if_incoming,
535 const struct batadv_forw_packet *forw_packet)
537 struct batadv_ogm_packet *batadv_ogm_packet;
538 int aggregated_bytes = forw_packet->packet_len + packet_len;
539 struct batadv_hard_iface *primary_if = NULL;
541 unsigned long aggregation_end_time;
543 batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
544 aggregation_end_time = send_time;
545 aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
547 /* we can aggregate the current packet to this aggregated packet
550 * - the send time is within our MAX_AGGREGATION_MS time
551 * - the resulting packet wont be bigger than
552 * MAX_AGGREGATION_BYTES
554 if (time_before(send_time, forw_packet->send_time) &&
555 time_after_eq(aggregation_end_time, forw_packet->send_time) &&
556 (aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) {
557 /* check aggregation compatibility
558 * -> direct link packets are broadcasted on
559 * their interface only
560 * -> aggregate packet if the current packet is
561 * a "global" packet as well as the base
564 primary_if = batadv_primary_if_get_selected(bat_priv);
568 /* packets without direct link flag and high TTL
569 * are flooded through the net
572 (!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) &&
573 (batadv_ogm_packet->ttl != 1) &&
575 /* own packets originating non-primary
576 * interfaces leave only that interface
578 ((!forw_packet->own) ||
579 (forw_packet->if_incoming == primary_if))) {
584 /* if the incoming packet is sent via this one
585 * interface only - we still can aggregate
588 (new_bat_ogm_packet->ttl == 1) &&
589 (forw_packet->if_incoming == if_incoming) &&
591 /* packets from direct neighbors or
592 * own secondary interface packets
593 * (= secondary interface packets in general)
595 (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
597 forw_packet->if_incoming != primary_if))) {
605 batadv_hardif_free_ref(primary_if);
609 /* create a new aggregated packet and add this packet to it */
610 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
611 int packet_len, unsigned long send_time,
613 struct batadv_hard_iface *if_incoming,
616 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
617 struct batadv_forw_packet *forw_packet_aggr;
618 unsigned char *skb_buff;
619 unsigned int skb_size;
621 if (!atomic_inc_not_zero(&if_incoming->refcount))
624 /* own packet should always be scheduled */
626 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
627 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
628 "batman packet queue full\n");
633 forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
634 if (!forw_packet_aggr) {
636 atomic_inc(&bat_priv->batman_queue_left);
640 if ((atomic_read(&bat_priv->aggregated_ogms)) &&
641 (packet_len < BATADV_MAX_AGGREGATION_BYTES))
642 skb_size = BATADV_MAX_AGGREGATION_BYTES;
644 skb_size = packet_len;
646 skb_size += ETH_HLEN;
648 forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size);
649 if (!forw_packet_aggr->skb) {
651 atomic_inc(&bat_priv->batman_queue_left);
652 kfree(forw_packet_aggr);
655 forw_packet_aggr->skb->priority = TC_PRIO_CONTROL;
656 skb_reserve(forw_packet_aggr->skb, ETH_HLEN);
658 skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
659 forw_packet_aggr->packet_len = packet_len;
660 memcpy(skb_buff, packet_buff, packet_len);
662 forw_packet_aggr->own = own_packet;
663 forw_packet_aggr->if_incoming = if_incoming;
664 forw_packet_aggr->num_packets = 0;
665 forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
666 forw_packet_aggr->send_time = send_time;
668 /* save packet direct link flag status */
670 forw_packet_aggr->direct_link_flags |= 1;
672 /* add new packet to packet list */
673 spin_lock_bh(&bat_priv->forw_bat_list_lock);
674 hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
675 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
677 /* start timer for this packet */
678 INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
679 batadv_send_outstanding_bat_ogm_packet);
680 queue_delayed_work(batadv_event_workqueue,
681 &forw_packet_aggr->delayed_work,
682 send_time - jiffies);
686 batadv_hardif_free_ref(if_incoming);
689 /* aggregate a new packet into the existing ogm packet */
690 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
691 const unsigned char *packet_buff,
692 int packet_len, bool direct_link)
694 unsigned char *skb_buff;
695 unsigned long new_direct_link_flag;
697 skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
698 memcpy(skb_buff, packet_buff, packet_len);
699 forw_packet_aggr->packet_len += packet_len;
700 forw_packet_aggr->num_packets++;
702 /* save packet direct link flag status */
704 new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
705 forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
709 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
710 unsigned char *packet_buff,
712 struct batadv_hard_iface *if_incoming,
713 int own_packet, unsigned long send_time)
715 /* _aggr -> pointer to the packet we want to aggregate with
716 * _pos -> pointer to the position in the queue
718 struct batadv_forw_packet *forw_packet_aggr = NULL;
719 struct batadv_forw_packet *forw_packet_pos = NULL;
720 struct batadv_ogm_packet *batadv_ogm_packet;
722 unsigned long max_aggregation_jiffies;
724 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
725 direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0;
726 max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
728 /* find position for the packet in the forward queue */
729 spin_lock_bh(&bat_priv->forw_bat_list_lock);
730 /* own packets are not to be aggregated */
731 if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
732 hlist_for_each_entry(forw_packet_pos,
733 &bat_priv->forw_bat_list, list) {
734 if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
735 bat_priv, packet_len,
736 send_time, direct_link,
739 forw_packet_aggr = forw_packet_pos;
745 /* nothing to aggregate with - either aggregation disabled or no
746 * suitable aggregation packet found
748 if (!forw_packet_aggr) {
749 /* the following section can run without the lock */
750 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
752 /* if we could not aggregate this packet with one of the others
753 * we hold it back for a while, so that it might be aggregated
756 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
757 send_time += max_aggregation_jiffies;
759 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
760 send_time, direct_link,
761 if_incoming, own_packet);
763 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
764 packet_len, direct_link);
765 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
769 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
770 const struct ethhdr *ethhdr,
771 struct batadv_ogm_packet *batadv_ogm_packet,
772 bool is_single_hop_neigh,
773 bool is_from_best_next_hop,
774 struct batadv_hard_iface *if_incoming)
776 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
779 if (batadv_ogm_packet->ttl <= 1) {
780 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
784 if (!is_from_best_next_hop) {
785 /* Mark the forwarded packet when it is not coming from our
786 * best next hop. We still need to forward the packet for our
787 * neighbor link quality detection to work in case the packet
788 * originated from a single hop neighbor. Otherwise we can
789 * simply drop the ogm.
791 if (is_single_hop_neigh)
792 batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
797 tvlv_len = ntohs(batadv_ogm_packet->tvlv_len);
799 batadv_ogm_packet->ttl--;
800 memcpy(batadv_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
802 /* apply hop penalty */
803 batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
806 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
807 "Forwarding packet: tq: %i, ttl: %i\n",
808 batadv_ogm_packet->tq, batadv_ogm_packet->ttl);
810 /* switch of primaries first hop flag when forwarding */
811 batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP;
812 if (is_single_hop_neigh)
813 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
815 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
817 batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
818 BATADV_OGM_HLEN + tvlv_len,
819 if_incoming, 0, batadv_iv_ogm_fwd_send_time());
823 * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for
824 * the given interface
825 * @hard_iface: the interface for which the windows have to be shifted
828 batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface)
830 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
831 struct batadv_hashtable *hash = bat_priv->orig_hash;
832 struct hlist_head *head;
833 struct batadv_orig_node *orig_node;
840 for (i = 0; i < hash->size; i++) {
841 head = &hash->table[i];
844 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
845 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
846 word_index = hard_iface->if_num * BATADV_NUM_WORDS;
847 word = &(orig_node->bat_iv.bcast_own[word_index]);
849 batadv_bit_get_packet(bat_priv, word, 1, 0);
850 if_num = hard_iface->if_num;
851 w = &orig_node->bat_iv.bcast_own_sum[if_num];
852 *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE);
853 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
859 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
861 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
862 unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
863 struct batadv_ogm_packet *batadv_ogm_packet;
864 struct batadv_hard_iface *primary_if;
865 int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
867 uint16_t tvlv_len = 0;
869 primary_if = batadv_primary_if_get_selected(bat_priv);
871 if (hard_iface == primary_if) {
872 /* tt changes have to be committed before the tvlv data is
873 * appended as it may alter the tt tvlv container
875 batadv_tt_local_commit_changes(bat_priv);
876 tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff,
881 batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
882 batadv_ogm_packet->tvlv_len = htons(tvlv_len);
884 /* change sequence number to network order */
885 seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno);
886 batadv_ogm_packet->seqno = htonl(seqno);
887 atomic_inc(&hard_iface->bat_iv.ogm_seqno);
889 batadv_iv_ogm_slide_own_bcast_window(hard_iface);
890 batadv_iv_ogm_queue_add(bat_priv, hard_iface->bat_iv.ogm_buff,
891 hard_iface->bat_iv.ogm_buff_len, hard_iface, 1,
892 batadv_iv_ogm_emit_send_time(bat_priv));
895 batadv_hardif_free_ref(primary_if);
899 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
900 struct batadv_orig_node *orig_node,
901 const struct ethhdr *ethhdr,
902 const struct batadv_ogm_packet *batadv_ogm_packet,
903 struct batadv_hard_iface *if_incoming,
904 const unsigned char *tt_buff,
905 enum batadv_dup_status dup_status)
907 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
908 struct batadv_neigh_node *router = NULL;
909 struct batadv_orig_node *orig_node_tmp;
911 uint8_t sum_orig, sum_neigh;
915 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
916 "update_originator(): Searching and updating originator entry of received packet\n");
919 hlist_for_each_entry_rcu(tmp_neigh_node,
920 &orig_node->neigh_list, list) {
921 neigh_addr = tmp_neigh_node->addr;
922 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
923 tmp_neigh_node->if_incoming == if_incoming &&
924 atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
925 if (WARN(neigh_node, "too many matching neigh_nodes"))
926 batadv_neigh_node_free_ref(neigh_node);
927 neigh_node = tmp_neigh_node;
931 if (dup_status != BATADV_NO_DUP)
934 spin_lock_bh(&tmp_neigh_node->bat_iv.lq_update_lock);
935 batadv_ring_buffer_set(tmp_neigh_node->bat_iv.tq_recv,
936 &tmp_neigh_node->bat_iv.tq_index, 0);
937 tq_avg = batadv_ring_buffer_avg(tmp_neigh_node->bat_iv.tq_recv);
938 tmp_neigh_node->bat_iv.tq_avg = tq_avg;
939 spin_unlock_bh(&tmp_neigh_node->bat_iv.lq_update_lock);
943 struct batadv_orig_node *orig_tmp;
945 orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source);
949 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
951 orig_node, orig_tmp);
953 batadv_orig_node_free_ref(orig_tmp);
957 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
958 "Updating existing last-hop neighbor of originator\n");
962 neigh_node->last_seen = jiffies;
964 spin_lock_bh(&neigh_node->bat_iv.lq_update_lock);
965 batadv_ring_buffer_set(neigh_node->bat_iv.tq_recv,
966 &neigh_node->bat_iv.tq_index,
967 batadv_ogm_packet->tq);
968 tq_avg = batadv_ring_buffer_avg(neigh_node->bat_iv.tq_recv);
969 neigh_node->bat_iv.tq_avg = tq_avg;
970 spin_unlock_bh(&neigh_node->bat_iv.lq_update_lock);
972 if (dup_status == BATADV_NO_DUP) {
973 orig_node->last_ttl = batadv_ogm_packet->ttl;
974 neigh_node->last_ttl = batadv_ogm_packet->ttl;
977 batadv_bonding_candidate_add(bat_priv, orig_node, neigh_node);
979 /* if this neighbor already is our next hop there is nothing
982 router = batadv_orig_node_get_router(orig_node);
983 if (router == neigh_node)
986 /* if this neighbor does not offer a better TQ we won't consider it */
987 if (router && (router->bat_iv.tq_avg > neigh_node->bat_iv.tq_avg))
990 /* if the TQ is the same and the link not more symmetric we
991 * won't consider it either
993 if (router && (neigh_node->bat_iv.tq_avg == router->bat_iv.tq_avg)) {
994 orig_node_tmp = router->orig_node;
995 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
996 if_num = router->if_incoming->if_num;
997 sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
998 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1000 orig_node_tmp = neigh_node->orig_node;
1001 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1002 if_num = neigh_node->if_incoming->if_num;
1003 sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1004 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1006 if (sum_orig >= sum_neigh)
1010 batadv_update_route(bat_priv, orig_node, neigh_node);
1017 batadv_neigh_node_free_ref(neigh_node);
1019 batadv_neigh_node_free_ref(router);
1022 static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
1023 struct batadv_orig_node *orig_neigh_node,
1024 struct batadv_ogm_packet *batadv_ogm_packet,
1025 struct batadv_hard_iface *if_incoming)
1027 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1028 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
1029 uint8_t total_count;
1030 uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
1031 unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
1032 int tq_asym_penalty, inv_asym_penalty, if_num, ret = 0;
1033 unsigned int combined_tq;
1035 /* find corresponding one hop neighbor */
1037 hlist_for_each_entry_rcu(tmp_neigh_node,
1038 &orig_neigh_node->neigh_list, list) {
1039 if (!batadv_compare_eth(tmp_neigh_node->addr,
1040 orig_neigh_node->orig))
1043 if (tmp_neigh_node->if_incoming != if_incoming)
1046 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
1049 neigh_node = tmp_neigh_node;
1055 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1056 orig_neigh_node->orig,
1063 /* if orig_node is direct neighbor update neigh_node last_seen */
1064 if (orig_node == orig_neigh_node)
1065 neigh_node->last_seen = jiffies;
1067 orig_node->last_seen = jiffies;
1069 /* find packet count of corresponding one hop neighbor */
1070 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1071 if_num = if_incoming->if_num;
1072 orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1073 neigh_rq_count = neigh_node->bat_iv.real_packet_count;
1074 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1076 /* pay attention to not get a value bigger than 100 % */
1077 if (orig_eq_count > neigh_rq_count)
1078 total_count = neigh_rq_count;
1080 total_count = orig_eq_count;
1082 /* if we have too few packets (too less data) we set tq_own to zero
1083 * if we receive too few packets it is not considered bidirectional
1085 if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
1086 neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
1089 /* neigh_node->real_packet_count is never zero as we
1090 * only purge old information when getting new
1093 tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count;
1095 /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
1096 * affect the nearly-symmetric links only a little, but
1097 * punishes asymmetric links more. This will give a value
1098 * between 0 and TQ_MAX_VALUE
1100 neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
1101 neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
1102 neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
1103 BATADV_TQ_LOCAL_WINDOW_SIZE *
1104 BATADV_TQ_LOCAL_WINDOW_SIZE;
1105 inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
1106 inv_asym_penalty /= neigh_rq_max_cube;
1107 tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
1109 combined_tq = batadv_ogm_packet->tq * tq_own * tq_asym_penalty;
1110 combined_tq /= BATADV_TQ_MAX_VALUE * BATADV_TQ_MAX_VALUE;
1111 batadv_ogm_packet->tq = combined_tq;
1113 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1114 "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n",
1115 orig_node->orig, orig_neigh_node->orig, total_count,
1116 neigh_rq_count, tq_own,
1117 tq_asym_penalty, batadv_ogm_packet->tq);
1119 /* if link has the minimum required transmission quality
1120 * consider it bidirectional
1122 if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
1127 batadv_neigh_node_free_ref(neigh_node);
1132 * batadv_iv_ogm_update_seqnos - process a batman packet for all interfaces,
1133 * adjust the sequence number and find out whether it is a duplicate
1134 * @ethhdr: ethernet header of the packet
1135 * @batadv_ogm_packet: OGM packet to be considered
1136 * @if_incoming: interface on which the OGM packet was received
1138 * Returns duplicate status as enum batadv_dup_status
1140 static enum batadv_dup_status
1141 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
1142 const struct batadv_ogm_packet *batadv_ogm_packet,
1143 const struct batadv_hard_iface *if_incoming)
1145 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1146 struct batadv_orig_node *orig_node;
1147 struct batadv_neigh_node *tmp_neigh_node;
1150 int need_update = 0;
1152 enum batadv_dup_status ret = BATADV_NO_DUP;
1153 uint32_t seqno = ntohl(batadv_ogm_packet->seqno);
1154 uint8_t *neigh_addr;
1155 uint8_t packet_count;
1156 unsigned long *bitmap;
1158 orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig);
1160 return BATADV_NO_DUP;
1162 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1163 seq_diff = seqno - orig_node->last_real_seqno;
1165 /* signalize caller that the packet is to be dropped. */
1166 if (!hlist_empty(&orig_node->neigh_list) &&
1167 batadv_window_protected(bat_priv, seq_diff,
1168 &orig_node->batman_seqno_reset)) {
1169 ret = BATADV_PROTECTED;
1174 hlist_for_each_entry_rcu(tmp_neigh_node,
1175 &orig_node->neigh_list, list) {
1176 neigh_addr = tmp_neigh_node->addr;
1177 is_dup = batadv_test_bit(tmp_neigh_node->bat_iv.real_bits,
1178 orig_node->last_real_seqno,
1181 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1182 tmp_neigh_node->if_incoming == if_incoming) {
1185 ret = BATADV_NEIGH_DUP;
1188 if (is_dup && (ret != BATADV_NEIGH_DUP))
1189 ret = BATADV_ORIG_DUP;
1192 /* if the window moved, set the update flag. */
1193 bitmap = tmp_neigh_node->bat_iv.real_bits;
1194 need_update |= batadv_bit_get_packet(bat_priv, bitmap,
1195 seq_diff, set_mark);
1197 packet_count = bitmap_weight(tmp_neigh_node->bat_iv.real_bits,
1198 BATADV_TQ_LOCAL_WINDOW_SIZE);
1199 tmp_neigh_node->bat_iv.real_packet_count = packet_count;
1204 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1205 "updating last_seqno: old %u, new %u\n",
1206 orig_node->last_real_seqno, seqno);
1207 orig_node->last_real_seqno = seqno;
1211 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1212 batadv_orig_node_free_ref(orig_node);
1216 static void batadv_iv_ogm_process(const struct ethhdr *ethhdr,
1217 struct batadv_ogm_packet *batadv_ogm_packet,
1218 const unsigned char *tt_buff,
1219 struct batadv_hard_iface *if_incoming)
1221 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1222 struct batadv_hard_iface *hard_iface;
1223 struct batadv_orig_node *orig_neigh_node, *orig_node, *orig_node_tmp;
1224 struct batadv_neigh_node *router = NULL, *router_router = NULL;
1225 struct batadv_neigh_node *orig_neigh_router = NULL;
1226 int has_directlink_flag;
1227 int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
1229 bool is_single_hop_neigh = false;
1230 bool is_from_best_next_hop = false;
1231 int sameseq, similar_ttl;
1232 enum batadv_dup_status dup_status;
1233 uint32_t if_incoming_seqno;
1234 uint8_t *prev_sender;
1236 /* Silently drop when the batman packet is actually not a
1239 * This might happen if a packet is padded (e.g. Ethernet has a
1240 * minimum frame length of 64 byte) and the aggregation interprets
1241 * it as an additional length.
1243 * TODO: A more sane solution would be to have a bit in the
1244 * batadv_ogm_packet to detect whether the packet is the last
1245 * packet in an aggregation. Here we expect that the padding
1246 * is always zero (or not 0x01)
1248 if (batadv_ogm_packet->packet_type != BATADV_IV_OGM)
1251 /* could be changed by schedule_own_packet() */
1252 if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
1254 if (batadv_ogm_packet->flags & BATADV_DIRECTLINK)
1255 has_directlink_flag = 1;
1257 has_directlink_flag = 0;
1259 if (batadv_compare_eth(ethhdr->h_source, batadv_ogm_packet->orig))
1260 is_single_hop_neigh = true;
1262 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1263 "Received BATMAN packet via NB: %pM, IF: %s [%pM] (from OG: %pM, via prev OG: %pM, seqno %u, tq %d, TTL %d, V %d, IDF %d)\n",
1264 ethhdr->h_source, if_incoming->net_dev->name,
1265 if_incoming->net_dev->dev_addr, batadv_ogm_packet->orig,
1266 batadv_ogm_packet->prev_sender,
1267 ntohl(batadv_ogm_packet->seqno), batadv_ogm_packet->tq,
1268 batadv_ogm_packet->ttl,
1269 batadv_ogm_packet->version, has_directlink_flag);
1272 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1273 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1276 if (hard_iface->soft_iface != if_incoming->soft_iface)
1279 if (batadv_compare_eth(ethhdr->h_source,
1280 hard_iface->net_dev->dev_addr))
1283 if (batadv_compare_eth(batadv_ogm_packet->orig,
1284 hard_iface->net_dev->dev_addr))
1287 if (batadv_compare_eth(batadv_ogm_packet->prev_sender,
1288 hard_iface->net_dev->dev_addr))
1294 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1295 "Drop packet: received my own broadcast (sender: %pM)\n",
1301 unsigned long *word;
1307 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1309 if (!orig_neigh_node)
1312 /* neighbor has to indicate direct link and it has to
1313 * come via the corresponding interface
1314 * save packet seqno for bidirectional check
1316 if (has_directlink_flag &&
1317 batadv_compare_eth(if_incoming->net_dev->dev_addr,
1318 batadv_ogm_packet->orig)) {
1319 if_num = if_incoming->if_num;
1320 offset = if_num * BATADV_NUM_WORDS;
1322 spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1323 word = &(orig_neigh_node->bat_iv.bcast_own[offset]);
1324 bit_pos = if_incoming_seqno - 2;
1325 bit_pos -= ntohl(batadv_ogm_packet->seqno);
1326 batadv_set_bit(word, bit_pos);
1327 weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1328 *weight = bitmap_weight(word,
1329 BATADV_TQ_LOCAL_WINDOW_SIZE);
1330 spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1333 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1334 "Drop packet: originator packet from myself (via neighbor)\n");
1335 batadv_orig_node_free_ref(orig_neigh_node);
1339 if (is_my_oldorig) {
1340 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1341 "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1346 if (batadv_ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
1347 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1348 "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1353 orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig);
1357 dup_status = batadv_iv_ogm_update_seqnos(ethhdr, batadv_ogm_packet,
1360 if (dup_status == BATADV_PROTECTED) {
1361 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1362 "Drop packet: packet within seqno protection time (sender: %pM)\n",
1367 if (batadv_ogm_packet->tq == 0) {
1368 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1369 "Drop packet: originator packet with tq equal 0\n");
1373 router = batadv_orig_node_get_router(orig_node);
1375 orig_node_tmp = router->orig_node;
1376 router_router = batadv_orig_node_get_router(orig_node_tmp);
1379 if ((router && router->bat_iv.tq_avg != 0) &&
1380 (batadv_compare_eth(router->addr, ethhdr->h_source)))
1381 is_from_best_next_hop = true;
1383 prev_sender = batadv_ogm_packet->prev_sender;
1384 /* avoid temporary routing loops */
1385 if (router && router_router &&
1386 (batadv_compare_eth(router->addr, prev_sender)) &&
1387 !(batadv_compare_eth(batadv_ogm_packet->orig, prev_sender)) &&
1388 (batadv_compare_eth(router->addr, router_router->addr))) {
1389 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1390 "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1395 batadv_tvlv_ogm_receive(bat_priv, batadv_ogm_packet, orig_node);
1397 /* if sender is a direct neighbor the sender mac equals
1400 if (is_single_hop_neigh)
1401 orig_neigh_node = orig_node;
1403 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1406 if (!orig_neigh_node)
1409 /* Update nc_nodes of the originator */
1410 batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node,
1411 batadv_ogm_packet, is_single_hop_neigh);
1413 orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node);
1415 /* drop packet if sender is not a direct neighbor and if we
1416 * don't route towards it
1418 if (!is_single_hop_neigh && (!orig_neigh_router)) {
1419 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1420 "Drop packet: OGM via unknown neighbor!\n");
1424 is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1425 batadv_ogm_packet, if_incoming);
1427 batadv_bonding_save_primary(orig_node, orig_neigh_node,
1430 /* update ranking if it is not a duplicate or has the same
1431 * seqno and similar ttl as the non-duplicate
1433 sameseq = orig_node->last_real_seqno == ntohl(batadv_ogm_packet->seqno);
1434 similar_ttl = orig_node->last_ttl - 3 <= batadv_ogm_packet->ttl;
1435 if (is_bidirect && ((dup_status == BATADV_NO_DUP) ||
1436 (sameseq && similar_ttl)))
1437 batadv_iv_ogm_orig_update(bat_priv, orig_node, ethhdr,
1438 batadv_ogm_packet, if_incoming,
1439 tt_buff, dup_status);
1441 /* is single hop (direct) neighbor */
1442 if (is_single_hop_neigh) {
1443 /* mark direct link on incoming interface */
1444 batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
1445 is_single_hop_neigh,
1446 is_from_best_next_hop, if_incoming);
1448 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1449 "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1453 /* multihop originator */
1455 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1456 "Drop packet: not received via bidirectional link\n");
1460 if (dup_status == BATADV_NEIGH_DUP) {
1461 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1462 "Drop packet: duplicate packet received\n");
1466 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1467 "Forwarding packet: rebroadcast originator packet\n");
1468 batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
1469 is_single_hop_neigh, is_from_best_next_hop,
1473 if ((orig_neigh_node) && (!is_single_hop_neigh))
1474 batadv_orig_node_free_ref(orig_neigh_node);
1477 batadv_neigh_node_free_ref(router);
1479 batadv_neigh_node_free_ref(router_router);
1480 if (orig_neigh_router)
1481 batadv_neigh_node_free_ref(orig_neigh_router);
1483 batadv_orig_node_free_ref(orig_node);
1486 static int batadv_iv_ogm_receive(struct sk_buff *skb,
1487 struct batadv_hard_iface *if_incoming)
1489 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1490 struct batadv_ogm_packet *batadv_ogm_packet;
1491 struct ethhdr *ethhdr;
1492 int buff_pos = 0, packet_len;
1493 unsigned char *tvlv_buff, *packet_buff;
1494 uint8_t *packet_pos;
1497 ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
1501 /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1502 * that does not have B.A.T.M.A.N. IV enabled ?
1504 if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
1507 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1508 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
1509 skb->len + ETH_HLEN);
1511 packet_len = skb_headlen(skb);
1512 ethhdr = eth_hdr(skb);
1513 packet_buff = skb->data;
1514 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
1516 /* unpack the aggregated packets and process them one by one */
1517 while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len,
1518 batadv_ogm_packet->tvlv_len)) {
1519 tvlv_buff = packet_buff + buff_pos + BATADV_OGM_HLEN;
1521 batadv_iv_ogm_process(ethhdr, batadv_ogm_packet,
1522 tvlv_buff, if_incoming);
1524 buff_pos += BATADV_OGM_HLEN;
1525 buff_pos += ntohs(batadv_ogm_packet->tvlv_len);
1527 packet_pos = packet_buff + buff_pos;
1528 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
1532 return NET_RX_SUCCESS;
1536 * batadv_iv_ogm_orig_print - print the originator table
1537 * @bat_priv: the bat priv with all the soft interface information
1538 * @seq: debugfs table seq_file struct
1540 static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv,
1541 struct seq_file *seq)
1543 struct batadv_neigh_node *neigh_node, *neigh_node_tmp;
1544 struct batadv_hashtable *hash = bat_priv->orig_hash;
1545 int last_seen_msecs, last_seen_secs;
1546 struct batadv_orig_node *orig_node;
1547 unsigned long last_seen_jiffies;
1548 struct hlist_head *head;
1549 int batman_count = 0;
1552 seq_printf(seq, " %-15s %s (%s/%i) %17s [%10s]: %20s ...\n",
1553 "Originator", "last-seen", "#", BATADV_TQ_MAX_VALUE,
1554 "Nexthop", "outgoingIF", "Potential nexthops");
1556 for (i = 0; i < hash->size; i++) {
1557 head = &hash->table[i];
1560 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1561 neigh_node = batadv_orig_node_get_router(orig_node);
1565 if (neigh_node->bat_iv.tq_avg == 0)
1568 last_seen_jiffies = jiffies - orig_node->last_seen;
1569 last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
1570 last_seen_secs = last_seen_msecs / 1000;
1571 last_seen_msecs = last_seen_msecs % 1000;
1573 seq_printf(seq, "%pM %4i.%03is (%3i) %pM [%10s]:",
1574 orig_node->orig, last_seen_secs,
1575 last_seen_msecs, neigh_node->bat_iv.tq_avg,
1577 neigh_node->if_incoming->net_dev->name);
1579 hlist_for_each_entry_rcu(neigh_node_tmp,
1580 &orig_node->neigh_list, list) {
1581 seq_printf(seq, " %pM (%3i)",
1582 neigh_node_tmp->addr,
1583 neigh_node_tmp->bat_iv.tq_avg);
1586 seq_puts(seq, "\n");
1590 batadv_neigh_node_free_ref(neigh_node);
1595 if (batman_count == 0)
1596 seq_puts(seq, "No batman nodes in range ...\n");
1600 * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors
1601 * @neigh1: the first neighbor object of the comparison
1602 * @neigh2: the second neighbor object of the comparison
1604 * Returns a value less, equal to or greater than 0 if the metric via neigh1 is
1605 * lower, the same as or higher than the metric via neigh2
1607 static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1,
1608 struct batadv_neigh_node *neigh2)
1612 tq1 = neigh1->bat_iv.tq_avg;
1613 tq2 = neigh2->bat_iv.tq_avg;
1619 * batadv_iv_ogm_neigh_is_eob - check if neigh1 is equally good or better than
1620 * neigh2 from the metric prospective
1621 * @neigh1: the first neighbor object of the comparison
1622 * @neigh2: the second neighbor object of the comparison
1624 * Returns true if the metric via neigh1 is equally good or better than the
1625 * metric via neigh2, false otherwise.
1627 static bool batadv_iv_ogm_neigh_is_eob(struct batadv_neigh_node *neigh1,
1628 struct batadv_neigh_node *neigh2)
1630 int diff = batadv_iv_ogm_neigh_cmp(neigh1, neigh2);
1632 return diff > -BATADV_TQ_SIMILARITY_THRESHOLD;
1635 static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
1636 .name = "BATMAN_IV",
1637 .bat_iface_enable = batadv_iv_ogm_iface_enable,
1638 .bat_iface_disable = batadv_iv_ogm_iface_disable,
1639 .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
1640 .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
1641 .bat_ogm_schedule = batadv_iv_ogm_schedule,
1642 .bat_ogm_emit = batadv_iv_ogm_emit,
1643 .bat_neigh_cmp = batadv_iv_ogm_neigh_cmp,
1644 .bat_neigh_is_equiv_or_better = batadv_iv_ogm_neigh_is_eob,
1645 .bat_orig_print = batadv_iv_ogm_orig_print,
1646 .bat_orig_free = batadv_iv_ogm_orig_free,
1647 .bat_orig_add_if = batadv_iv_ogm_orig_add_if,
1648 .bat_orig_del_if = batadv_iv_ogm_orig_del_if,
1651 int __init batadv_iv_init(void)
1655 /* batman originator packet */
1656 ret = batadv_recv_handler_register(BATADV_IV_OGM,
1657 batadv_iv_ogm_receive);
1661 ret = batadv_algo_register(&batadv_batman_iv);
1663 goto handler_unregister;
1668 batadv_recv_handler_unregister(BATADV_IV_OGM);