1 /* Copyright (C) 2007-2014 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,
114 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
116 old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS;
117 data_ptr = kmalloc_array(max_if_num,
118 BATADV_NUM_WORDS * sizeof(unsigned long),
123 memcpy(data_ptr, orig_node->bat_iv.bcast_own, old_size);
124 kfree(orig_node->bat_iv.bcast_own);
125 orig_node->bat_iv.bcast_own = data_ptr;
127 data_ptr = kmalloc_array(max_if_num, sizeof(uint8_t), GFP_ATOMIC);
129 kfree(orig_node->bat_iv.bcast_own);
133 memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum,
134 (max_if_num - 1) * sizeof(uint8_t));
135 kfree(orig_node->bat_iv.bcast_own_sum);
136 orig_node->bat_iv.bcast_own_sum = data_ptr;
141 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
147 * batadv_iv_ogm_orig_del_if - change the private structures of the orig_node to
148 * exclude the removed interface
149 * @orig_node: the orig_node that has to be changed
150 * @max_if_num: the current amount of interfaces
151 * @del_if_num: the index of the interface being removed
153 * Returns 0 on success, a negative error code otherwise.
155 static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node,
156 int max_if_num, int del_if_num)
158 int chunk_size, ret = -ENOMEM, if_offset;
159 void *data_ptr = NULL;
161 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
163 /* last interface was removed */
167 chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS;
168 data_ptr = kmalloc_array(max_if_num, chunk_size, GFP_ATOMIC);
172 /* copy first part */
173 memcpy(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size);
175 /* copy second part */
176 memcpy((char *)data_ptr + del_if_num * chunk_size,
177 orig_node->bat_iv.bcast_own + ((del_if_num + 1) * chunk_size),
178 (max_if_num - del_if_num) * chunk_size);
181 kfree(orig_node->bat_iv.bcast_own);
182 orig_node->bat_iv.bcast_own = data_ptr;
187 data_ptr = kmalloc_array(max_if_num, sizeof(uint8_t), GFP_ATOMIC);
189 kfree(orig_node->bat_iv.bcast_own);
193 memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum,
194 del_if_num * sizeof(uint8_t));
196 if_offset = (del_if_num + 1) * sizeof(uint8_t);
197 memcpy((char *)data_ptr + del_if_num * sizeof(uint8_t),
198 orig_node->bat_iv.bcast_own_sum + if_offset,
199 (max_if_num - del_if_num) * sizeof(uint8_t));
202 kfree(orig_node->bat_iv.bcast_own_sum);
203 orig_node->bat_iv.bcast_own_sum = data_ptr;
207 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
213 * batadv_iv_ogm_orig_get - retrieve or create (if does not exist) an originator
214 * @bat_priv: the bat priv with all the soft interface information
215 * @addr: mac address of the originator
217 * Returns the originator object corresponding to the passed mac address or NULL
219 * If the object does not exists it is created an initialised.
221 static struct batadv_orig_node *
222 batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const uint8_t *addr)
224 struct batadv_orig_node *orig_node;
225 int size, hash_added;
227 orig_node = batadv_orig_hash_find(bat_priv, addr);
231 orig_node = batadv_orig_node_new(bat_priv, addr);
235 spin_lock_init(&orig_node->bat_iv.ogm_cnt_lock);
237 size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS;
238 orig_node->bat_iv.bcast_own = kzalloc(size, GFP_ATOMIC);
239 if (!orig_node->bat_iv.bcast_own)
242 size = bat_priv->num_ifaces * sizeof(uint8_t);
243 orig_node->bat_iv.bcast_own_sum = kzalloc(size, GFP_ATOMIC);
244 if (!orig_node->bat_iv.bcast_own_sum)
247 hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig,
248 batadv_choose_orig, orig_node,
249 &orig_node->hash_entry);
256 /* free twice, as batadv_orig_node_new sets refcount to 2 */
257 batadv_orig_node_free_ref(orig_node);
258 batadv_orig_node_free_ref(orig_node);
263 static struct batadv_neigh_node *
264 batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface,
265 const uint8_t *neigh_addr,
266 struct batadv_orig_node *orig_node,
267 struct batadv_orig_node *orig_neigh)
269 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
270 struct batadv_neigh_node *neigh_node, *tmp_neigh_node;
272 neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr, orig_node);
276 if (!atomic_inc_not_zero(&hard_iface->refcount)) {
282 neigh_node->orig_node = orig_neigh;
283 neigh_node->if_incoming = hard_iface;
285 spin_lock_bh(&orig_node->neigh_list_lock);
286 tmp_neigh_node = batadv_neigh_node_get(orig_node, hard_iface,
288 if (!tmp_neigh_node) {
289 hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
292 batadv_hardif_free_ref(hard_iface);
293 neigh_node = tmp_neigh_node;
295 spin_unlock_bh(&orig_node->neigh_list_lock);
298 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
299 "Creating new neighbor %pM for orig_node %pM on interface %s\n",
300 neigh_addr, orig_node->orig,
301 hard_iface->net_dev->name);
307 static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
309 struct batadv_ogm_packet *batadv_ogm_packet;
310 unsigned char *ogm_buff;
311 uint32_t random_seqno;
314 /* randomize initial seqno to avoid collision */
315 get_random_bytes(&random_seqno, sizeof(random_seqno));
316 atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno);
318 hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN;
319 ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC);
323 hard_iface->bat_iv.ogm_buff = ogm_buff;
325 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
326 batadv_ogm_packet->packet_type = BATADV_IV_OGM;
327 batadv_ogm_packet->version = BATADV_COMPAT_VERSION;
328 batadv_ogm_packet->ttl = 2;
329 batadv_ogm_packet->flags = BATADV_NO_FLAGS;
330 batadv_ogm_packet->reserved = 0;
331 batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
339 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
341 kfree(hard_iface->bat_iv.ogm_buff);
342 hard_iface->bat_iv.ogm_buff = NULL;
345 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
347 struct batadv_ogm_packet *batadv_ogm_packet;
348 unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
350 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
351 ether_addr_copy(batadv_ogm_packet->orig,
352 hard_iface->net_dev->dev_addr);
353 ether_addr_copy(batadv_ogm_packet->prev_sender,
354 hard_iface->net_dev->dev_addr);
358 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
360 struct batadv_ogm_packet *batadv_ogm_packet;
361 unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
363 batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
364 batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP;
365 batadv_ogm_packet->ttl = BATADV_TTL;
368 /* when do we schedule our own ogm to be sent */
370 batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
374 msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
375 msecs += prandom_u32() % (2 * BATADV_JITTER);
377 return jiffies + msecs_to_jiffies(msecs);
380 /* when do we schedule a ogm packet to be sent */
381 static unsigned long batadv_iv_ogm_fwd_send_time(void)
383 return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2));
386 /* apply hop penalty for a normal link */
387 static uint8_t batadv_hop_penalty(uint8_t tq,
388 const struct batadv_priv *bat_priv)
390 int hop_penalty = atomic_read(&bat_priv->hop_penalty);
393 new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
394 new_tq /= BATADV_TQ_MAX_VALUE;
399 /* is there another aggregated packet here? */
400 static int batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
403 int next_buff_pos = 0;
405 next_buff_pos += buff_pos + BATADV_OGM_HLEN;
406 next_buff_pos += ntohs(tvlv_len);
408 return (next_buff_pos <= packet_len) &&
409 (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
412 /* send a batman ogm to a given interface */
413 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
414 struct batadv_hard_iface *hard_iface)
416 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
420 struct batadv_ogm_packet *batadv_ogm_packet;
424 if (hard_iface->if_status != BATADV_IF_ACTIVE)
429 packet_pos = forw_packet->skb->data;
430 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
432 /* adjust all flags and log packets */
433 while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
434 batadv_ogm_packet->tvlv_len)) {
435 /* we might have aggregated direct link packets with an
436 * ordinary base packet
438 if (forw_packet->direct_link_flags & BIT(packet_num) &&
439 forw_packet->if_incoming == hard_iface)
440 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
442 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
444 if (packet_num > 0 || !forw_packet->own)
445 fwd_str = "Forwarding";
447 fwd_str = "Sending own";
449 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
450 "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n",
451 fwd_str, (packet_num > 0 ? "aggregated " : ""),
452 batadv_ogm_packet->orig,
453 ntohl(batadv_ogm_packet->seqno),
454 batadv_ogm_packet->tq, batadv_ogm_packet->ttl,
455 (batadv_ogm_packet->flags & BATADV_DIRECTLINK ?
457 hard_iface->net_dev->name,
458 hard_iface->net_dev->dev_addr);
460 buff_pos += BATADV_OGM_HLEN;
461 buff_pos += ntohs(batadv_ogm_packet->tvlv_len);
463 packet_pos = forw_packet->skb->data + buff_pos;
464 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
467 /* create clone because function is called more than once */
468 skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
470 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
471 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
472 skb->len + ETH_HLEN);
473 batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr);
477 /* send a batman ogm packet */
478 static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
480 struct net_device *soft_iface;
481 struct batadv_priv *bat_priv;
482 struct batadv_hard_iface *primary_if = NULL;
484 if (!forw_packet->if_incoming) {
485 pr_err("Error - can't forward packet: incoming iface not specified\n");
489 soft_iface = forw_packet->if_incoming->soft_iface;
490 bat_priv = netdev_priv(soft_iface);
492 if (WARN_ON(!forw_packet->if_outgoing))
495 if (WARN_ON(forw_packet->if_outgoing->soft_iface != soft_iface))
498 if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
501 primary_if = batadv_primary_if_get_selected(bat_priv);
505 /* only for one specific outgoing interface */
506 batadv_iv_ogm_send_to_if(forw_packet, forw_packet->if_outgoing);
510 batadv_hardif_free_ref(primary_if);
514 * batadv_iv_ogm_can_aggregate - find out if an OGM can be aggregated on an
515 * existing forward packet
516 * @new_bat_ogm_packet: OGM packet to be aggregated
517 * @bat_priv: the bat priv with all the soft interface information
518 * @packet_len: (total) length of the OGM
519 * @send_time: timestamp (jiffies) when the packet is to be sent
520 * @direktlink: true if this is a direct link packet
521 * @if_incoming: interface where the packet was received
522 * @if_outgoing: interface for which the retransmission should be considered
523 * @forw_packet: the forwarded packet which should be checked
525 * Returns true if new_packet can be aggregated with forw_packet
528 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
529 struct batadv_priv *bat_priv,
530 int packet_len, unsigned long send_time,
532 const struct batadv_hard_iface *if_incoming,
533 const struct batadv_hard_iface *if_outgoing,
534 const struct batadv_forw_packet *forw_packet)
536 struct batadv_ogm_packet *batadv_ogm_packet;
537 int aggregated_bytes = forw_packet->packet_len + packet_len;
538 struct batadv_hard_iface *primary_if = NULL;
540 unsigned long aggregation_end_time;
542 batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
543 aggregation_end_time = send_time;
544 aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
546 /* we can aggregate the current packet to this aggregated packet
549 * - the send time is within our MAX_AGGREGATION_MS time
550 * - the resulting packet wont be bigger than
551 * MAX_AGGREGATION_BYTES
553 if (time_before(send_time, forw_packet->send_time) &&
554 time_after_eq(aggregation_end_time, forw_packet->send_time) &&
555 (aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) {
556 /* check aggregation compatibility
557 * -> direct link packets are broadcasted on
558 * their interface only
559 * -> aggregate packet if the current packet is
560 * a "global" packet as well as the base
563 primary_if = batadv_primary_if_get_selected(bat_priv);
567 /* packet is not leaving on the same interface. */
568 if (forw_packet->if_outgoing != if_outgoing)
571 /* packets without direct link flag and high TTL
572 * are flooded through the net
575 (!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) &&
576 (batadv_ogm_packet->ttl != 1) &&
578 /* own packets originating non-primary
579 * interfaces leave only that interface
581 ((!forw_packet->own) ||
582 (forw_packet->if_incoming == primary_if))) {
587 /* if the incoming packet is sent via this one
588 * interface only - we still can aggregate
591 (new_bat_ogm_packet->ttl == 1) &&
592 (forw_packet->if_incoming == if_incoming) &&
594 /* packets from direct neighbors or
595 * own secondary interface packets
596 * (= secondary interface packets in general)
598 (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
600 forw_packet->if_incoming != primary_if))) {
608 batadv_hardif_free_ref(primary_if);
613 * batadv_iv_ogm_aggregate_new - create a new aggregated packet and add this
615 * @packet_buff: pointer to the OGM
616 * @packet_len: (total) length of the OGM
617 * @send_time: timestamp (jiffies) when the packet is to be sent
618 * @direct_link: whether this OGM has direct link status
619 * @if_incoming: interface where the packet was received
620 * @if_outgoing: interface for which the retransmission should be considered
621 * @own_packet: true if it is a self-generated ogm
623 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
624 int packet_len, unsigned long send_time,
626 struct batadv_hard_iface *if_incoming,
627 struct batadv_hard_iface *if_outgoing,
630 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
631 struct batadv_forw_packet *forw_packet_aggr;
632 unsigned char *skb_buff;
633 unsigned int skb_size;
635 if (!atomic_inc_not_zero(&if_incoming->refcount))
638 if (!atomic_inc_not_zero(&if_outgoing->refcount))
639 goto out_free_incoming;
641 /* own packet should always be scheduled */
643 if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
644 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
645 "batman packet queue full\n");
650 forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
651 if (!forw_packet_aggr) {
653 atomic_inc(&bat_priv->batman_queue_left);
657 if ((atomic_read(&bat_priv->aggregated_ogms)) &&
658 (packet_len < BATADV_MAX_AGGREGATION_BYTES))
659 skb_size = BATADV_MAX_AGGREGATION_BYTES;
661 skb_size = packet_len;
663 skb_size += ETH_HLEN;
665 forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size);
666 if (!forw_packet_aggr->skb) {
668 atomic_inc(&bat_priv->batman_queue_left);
669 kfree(forw_packet_aggr);
672 forw_packet_aggr->skb->priority = TC_PRIO_CONTROL;
673 skb_reserve(forw_packet_aggr->skb, ETH_HLEN);
675 skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
676 forw_packet_aggr->packet_len = packet_len;
677 memcpy(skb_buff, packet_buff, packet_len);
679 forw_packet_aggr->own = own_packet;
680 forw_packet_aggr->if_incoming = if_incoming;
681 forw_packet_aggr->if_outgoing = if_outgoing;
682 forw_packet_aggr->num_packets = 0;
683 forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
684 forw_packet_aggr->send_time = send_time;
686 /* save packet direct link flag status */
688 forw_packet_aggr->direct_link_flags |= 1;
690 /* add new packet to packet list */
691 spin_lock_bh(&bat_priv->forw_bat_list_lock);
692 hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
693 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
695 /* start timer for this packet */
696 INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
697 batadv_send_outstanding_bat_ogm_packet);
698 queue_delayed_work(batadv_event_workqueue,
699 &forw_packet_aggr->delayed_work,
700 send_time - jiffies);
704 batadv_hardif_free_ref(if_outgoing);
706 batadv_hardif_free_ref(if_incoming);
709 /* aggregate a new packet into the existing ogm packet */
710 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
711 const unsigned char *packet_buff,
712 int packet_len, bool direct_link)
714 unsigned char *skb_buff;
715 unsigned long new_direct_link_flag;
717 skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
718 memcpy(skb_buff, packet_buff, packet_len);
719 forw_packet_aggr->packet_len += packet_len;
720 forw_packet_aggr->num_packets++;
722 /* save packet direct link flag status */
724 new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
725 forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
730 * batadv_iv_ogm_queue_add - queue up an OGM for transmission
731 * @bat_priv: the bat priv with all the soft interface information
732 * @packet_buff: pointer to the OGM
733 * @packet_len: (total) length of the OGM
734 * @if_incoming: interface where the packet was received
735 * @if_outgoing: interface for which the retransmission should be considered
736 * @own_packet: true if it is a self-generated ogm
737 * @send_time: timestamp (jiffies) when the packet is to be sent
739 static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
740 unsigned char *packet_buff,
742 struct batadv_hard_iface *if_incoming,
743 struct batadv_hard_iface *if_outgoing,
744 int own_packet, unsigned long send_time)
746 /* _aggr -> pointer to the packet we want to aggregate with
747 * _pos -> pointer to the position in the queue
749 struct batadv_forw_packet *forw_packet_aggr = NULL;
750 struct batadv_forw_packet *forw_packet_pos = NULL;
751 struct batadv_ogm_packet *batadv_ogm_packet;
753 unsigned long max_aggregation_jiffies;
755 batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
756 direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0;
757 max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
759 /* find position for the packet in the forward queue */
760 spin_lock_bh(&bat_priv->forw_bat_list_lock);
761 /* own packets are not to be aggregated */
762 if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
763 hlist_for_each_entry(forw_packet_pos,
764 &bat_priv->forw_bat_list, list) {
765 if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
766 bat_priv, packet_len,
767 send_time, direct_link,
771 forw_packet_aggr = forw_packet_pos;
777 /* nothing to aggregate with - either aggregation disabled or no
778 * suitable aggregation packet found
780 if (!forw_packet_aggr) {
781 /* the following section can run without the lock */
782 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
784 /* if we could not aggregate this packet with one of the others
785 * we hold it back for a while, so that it might be aggregated
788 if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
789 send_time += max_aggregation_jiffies;
791 batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
792 send_time, direct_link,
793 if_incoming, if_outgoing,
796 batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
797 packet_len, direct_link);
798 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
802 static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
803 const struct ethhdr *ethhdr,
804 struct batadv_ogm_packet *batadv_ogm_packet,
805 bool is_single_hop_neigh,
806 bool is_from_best_next_hop,
807 struct batadv_hard_iface *if_incoming,
808 struct batadv_hard_iface *if_outgoing)
810 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
813 if (batadv_ogm_packet->ttl <= 1) {
814 batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
818 if (!is_from_best_next_hop) {
819 /* Mark the forwarded packet when it is not coming from our
820 * best next hop. We still need to forward the packet for our
821 * neighbor link quality detection to work in case the packet
822 * originated from a single hop neighbor. Otherwise we can
823 * simply drop the ogm.
825 if (is_single_hop_neigh)
826 batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
831 tvlv_len = ntohs(batadv_ogm_packet->tvlv_len);
833 batadv_ogm_packet->ttl--;
834 ether_addr_copy(batadv_ogm_packet->prev_sender, ethhdr->h_source);
836 /* apply hop penalty */
837 batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
840 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
841 "Forwarding packet: tq: %i, ttl: %i\n",
842 batadv_ogm_packet->tq, batadv_ogm_packet->ttl);
844 /* switch of primaries first hop flag when forwarding */
845 batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP;
846 if (is_single_hop_neigh)
847 batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
849 batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
851 batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
852 BATADV_OGM_HLEN + tvlv_len,
853 if_incoming, if_outgoing, 0,
854 batadv_iv_ogm_fwd_send_time());
858 * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for
859 * the given interface
860 * @hard_iface: the interface for which the windows have to be shifted
863 batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface)
865 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
866 struct batadv_hashtable *hash = bat_priv->orig_hash;
867 struct hlist_head *head;
868 struct batadv_orig_node *orig_node;
875 for (i = 0; i < hash->size; i++) {
876 head = &hash->table[i];
879 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
880 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
881 word_index = hard_iface->if_num * BATADV_NUM_WORDS;
882 word = &(orig_node->bat_iv.bcast_own[word_index]);
884 batadv_bit_get_packet(bat_priv, word, 1, 0);
885 if_num = hard_iface->if_num;
886 w = &orig_node->bat_iv.bcast_own_sum[if_num];
887 *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE);
888 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
894 static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
896 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
897 unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
898 struct batadv_ogm_packet *batadv_ogm_packet;
899 struct batadv_hard_iface *primary_if, *tmp_hard_iface;
900 int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
902 uint16_t tvlv_len = 0;
903 unsigned long send_time;
905 primary_if = batadv_primary_if_get_selected(bat_priv);
907 if (hard_iface == primary_if) {
908 /* tt changes have to be committed before the tvlv data is
909 * appended as it may alter the tt tvlv container
911 batadv_tt_local_commit_changes(bat_priv);
912 tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff,
917 batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
918 batadv_ogm_packet->tvlv_len = htons(tvlv_len);
920 /* change sequence number to network order */
921 seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno);
922 batadv_ogm_packet->seqno = htonl(seqno);
923 atomic_inc(&hard_iface->bat_iv.ogm_seqno);
925 batadv_iv_ogm_slide_own_bcast_window(hard_iface);
927 send_time = batadv_iv_ogm_emit_send_time(bat_priv);
929 if (hard_iface != primary_if) {
930 /* OGMs from secondary interfaces are only scheduled on their
931 * respective interfaces.
933 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, *ogm_buff_len,
934 hard_iface, hard_iface, 1, send_time);
938 /* OGMs from primary interfaces are scheduled on all
942 list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) {
943 if (tmp_hard_iface->soft_iface != hard_iface->soft_iface)
945 batadv_iv_ogm_queue_add(bat_priv, *ogm_buff,
946 *ogm_buff_len, hard_iface,
947 tmp_hard_iface, 1, send_time);
953 batadv_hardif_free_ref(primary_if);
957 * batadv_iv_ogm_orig_update - use OGM to update corresponding data in an
959 * @bat_priv: the bat priv with all the soft interface information
960 * @orig_node: the orig node who originally emitted the ogm packet
961 * @orig_ifinfo: ifinfo for the outgoing interface of the orig_node
962 * @ethhdr: Ethernet header of the OGM
963 * @batadv_ogm_packet: the ogm packet
964 * @if_incoming: interface where the packet was received
965 * @if_outgoing: interface for which the retransmission should be considered
966 * @dup_status: the duplicate status of this ogm packet.
969 batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
970 struct batadv_orig_node *orig_node,
971 struct batadv_orig_ifinfo *orig_ifinfo,
972 const struct ethhdr *ethhdr,
973 const struct batadv_ogm_packet *batadv_ogm_packet,
974 struct batadv_hard_iface *if_incoming,
975 struct batadv_hard_iface *if_outgoing,
976 enum batadv_dup_status dup_status)
978 struct batadv_neigh_ifinfo *neigh_ifinfo = NULL;
979 struct batadv_neigh_ifinfo *router_ifinfo = NULL;
980 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
981 struct batadv_neigh_node *router = NULL;
982 struct batadv_orig_node *orig_node_tmp;
984 uint8_t sum_orig, sum_neigh;
988 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
989 "update_originator(): Searching and updating originator entry of received packet\n");
992 hlist_for_each_entry_rcu(tmp_neigh_node,
993 &orig_node->neigh_list, list) {
994 neigh_addr = tmp_neigh_node->addr;
995 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
996 tmp_neigh_node->if_incoming == if_incoming &&
997 atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
998 if (WARN(neigh_node, "too many matching neigh_nodes"))
999 batadv_neigh_node_free_ref(neigh_node);
1000 neigh_node = tmp_neigh_node;
1004 if (dup_status != BATADV_NO_DUP)
1007 /* only update the entry for this outgoing interface */
1008 neigh_ifinfo = batadv_neigh_ifinfo_get(tmp_neigh_node,
1013 spin_lock_bh(&tmp_neigh_node->ifinfo_lock);
1014 batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1015 &neigh_ifinfo->bat_iv.tq_index, 0);
1016 tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1017 neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1018 spin_unlock_bh(&tmp_neigh_node->ifinfo_lock);
1020 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1021 neigh_ifinfo = NULL;
1025 struct batadv_orig_node *orig_tmp;
1027 orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source);
1031 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1033 orig_node, orig_tmp);
1035 batadv_orig_node_free_ref(orig_tmp);
1039 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1040 "Updating existing last-hop neighbor of originator\n");
1043 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1047 neigh_node->last_seen = jiffies;
1049 spin_lock_bh(&neigh_node->ifinfo_lock);
1050 batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
1051 &neigh_ifinfo->bat_iv.tq_index,
1052 batadv_ogm_packet->tq);
1053 tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
1054 neigh_ifinfo->bat_iv.tq_avg = tq_avg;
1055 spin_unlock_bh(&neigh_node->ifinfo_lock);
1057 if (dup_status == BATADV_NO_DUP) {
1058 orig_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1059 neigh_ifinfo->last_ttl = batadv_ogm_packet->ttl;
1062 /* if this neighbor already is our next hop there is nothing
1065 router = batadv_orig_router_get(orig_node, if_outgoing);
1066 if (router == neigh_node)
1070 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1074 /* if this neighbor does not offer a better TQ we won't
1077 if (router_ifinfo->bat_iv.tq_avg > neigh_ifinfo->bat_iv.tq_avg)
1081 /* if the TQ is the same and the link not more symmetric we
1082 * won't consider it either
1084 if (router_ifinfo &&
1085 (neigh_ifinfo->bat_iv.tq_avg == router_ifinfo->bat_iv.tq_avg)) {
1086 orig_node_tmp = router->orig_node;
1087 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1088 if_num = router->if_incoming->if_num;
1089 sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1090 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1092 orig_node_tmp = neigh_node->orig_node;
1093 spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1094 if_num = neigh_node->if_incoming->if_num;
1095 sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
1096 spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
1098 if (sum_orig >= sum_neigh)
1102 batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node);
1109 batadv_neigh_node_free_ref(neigh_node);
1111 batadv_neigh_node_free_ref(router);
1113 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1115 batadv_neigh_ifinfo_free_ref(router_ifinfo);
1119 * batadv_iv_ogm_calc_tq - calculate tq for current received ogm packet
1120 * @orig_node: the orig node who originally emitted the ogm packet
1121 * @orig_neigh_node: the orig node struct of the neighbor who sent the packet
1122 * @batadv_ogm_packet: the ogm packet
1123 * @if_incoming: interface where the packet was received
1124 * @if_outgoing: interface for which the retransmission should be considered
1126 * Returns 1 if the link can be considered bidirectional, 0 otherwise
1128 static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
1129 struct batadv_orig_node *orig_neigh_node,
1130 struct batadv_ogm_packet *batadv_ogm_packet,
1131 struct batadv_hard_iface *if_incoming,
1132 struct batadv_hard_iface *if_outgoing)
1134 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1135 struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
1136 struct batadv_neigh_ifinfo *neigh_ifinfo;
1137 uint8_t total_count;
1138 uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
1139 unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
1140 int tq_asym_penalty, inv_asym_penalty, if_num, ret = 0;
1141 unsigned int combined_tq;
1142 int tq_iface_penalty;
1144 /* find corresponding one hop neighbor */
1146 hlist_for_each_entry_rcu(tmp_neigh_node,
1147 &orig_neigh_node->neigh_list, list) {
1148 if (!batadv_compare_eth(tmp_neigh_node->addr,
1149 orig_neigh_node->orig))
1152 if (tmp_neigh_node->if_incoming != if_incoming)
1155 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
1158 neigh_node = tmp_neigh_node;
1164 neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
1165 orig_neigh_node->orig,
1172 /* if orig_node is direct neighbor update neigh_node last_seen */
1173 if (orig_node == orig_neigh_node)
1174 neigh_node->last_seen = jiffies;
1176 orig_node->last_seen = jiffies;
1178 /* find packet count of corresponding one hop neighbor */
1179 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1180 if_num = if_incoming->if_num;
1181 orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1182 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
1184 neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count;
1185 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1189 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1191 /* pay attention to not get a value bigger than 100 % */
1192 if (orig_eq_count > neigh_rq_count)
1193 total_count = neigh_rq_count;
1195 total_count = orig_eq_count;
1197 /* if we have too few packets (too less data) we set tq_own to zero
1198 * if we receive too few packets it is not considered bidirectional
1200 if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
1201 neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
1204 /* neigh_node->real_packet_count is never zero as we
1205 * only purge old information when getting new
1208 tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count;
1210 /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
1211 * affect the nearly-symmetric links only a little, but
1212 * punishes asymmetric links more. This will give a value
1213 * between 0 and TQ_MAX_VALUE
1215 neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
1216 neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
1217 neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
1218 BATADV_TQ_LOCAL_WINDOW_SIZE *
1219 BATADV_TQ_LOCAL_WINDOW_SIZE;
1220 inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
1221 inv_asym_penalty /= neigh_rq_max_cube;
1222 tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
1224 /* penalize if the OGM is forwarded on the same interface. WiFi
1225 * interfaces and other half duplex devices suffer from throughput
1226 * drops as they can't send and receive at the same time.
1228 tq_iface_penalty = BATADV_TQ_MAX_VALUE;
1229 if (if_outgoing && (if_incoming == if_outgoing) &&
1230 batadv_is_wifi_netdev(if_outgoing->net_dev))
1231 tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE,
1234 combined_tq = batadv_ogm_packet->tq *
1238 combined_tq /= BATADV_TQ_MAX_VALUE *
1239 BATADV_TQ_MAX_VALUE *
1240 BATADV_TQ_MAX_VALUE;
1241 batadv_ogm_packet->tq = combined_tq;
1243 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1244 "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, iface_penalty: %3i, total tq: %3i, if_incoming = %s, if_outgoing = %s\n",
1245 orig_node->orig, orig_neigh_node->orig, total_count,
1246 neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty,
1247 batadv_ogm_packet->tq, if_incoming->net_dev->name,
1248 if_outgoing ? if_outgoing->net_dev->name : "DEFAULT");
1250 /* if link has the minimum required transmission quality
1251 * consider it bidirectional
1253 if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
1258 batadv_neigh_node_free_ref(neigh_node);
1263 * batadv_iv_ogm_update_seqnos - process a batman packet for all interfaces,
1264 * adjust the sequence number and find out whether it is a duplicate
1265 * @ethhdr: ethernet header of the packet
1266 * @batadv_ogm_packet: OGM packet to be considered
1267 * @if_incoming: interface on which the OGM packet was received
1268 * @if_outgoing: interface for which the retransmission should be considered
1270 * Returns duplicate status as enum batadv_dup_status
1272 static enum batadv_dup_status
1273 batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
1274 const struct batadv_ogm_packet *batadv_ogm_packet,
1275 const struct batadv_hard_iface *if_incoming,
1276 struct batadv_hard_iface *if_outgoing)
1278 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1279 struct batadv_orig_node *orig_node;
1280 struct batadv_orig_ifinfo *orig_ifinfo = NULL;
1281 struct batadv_neigh_node *neigh_node;
1282 struct batadv_neigh_ifinfo *neigh_ifinfo;
1285 int need_update = 0;
1287 enum batadv_dup_status ret = BATADV_NO_DUP;
1288 uint32_t seqno = ntohl(batadv_ogm_packet->seqno);
1289 uint8_t *neigh_addr;
1290 uint8_t packet_count;
1291 unsigned long *bitmap;
1293 orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig);
1295 return BATADV_NO_DUP;
1297 orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1298 if (WARN_ON(!orig_ifinfo)) {
1299 batadv_orig_node_free_ref(orig_node);
1303 spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1304 seq_diff = seqno - orig_ifinfo->last_real_seqno;
1306 /* signalize caller that the packet is to be dropped. */
1307 if (!hlist_empty(&orig_node->neigh_list) &&
1308 batadv_window_protected(bat_priv, seq_diff,
1309 &orig_ifinfo->batman_seqno_reset)) {
1310 ret = BATADV_PROTECTED;
1315 hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1316 neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node,
1321 neigh_addr = neigh_node->addr;
1322 is_dup = batadv_test_bit(neigh_ifinfo->bat_iv.real_bits,
1323 orig_ifinfo->last_real_seqno,
1326 if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
1327 neigh_node->if_incoming == if_incoming) {
1330 ret = BATADV_NEIGH_DUP;
1333 if (is_dup && (ret != BATADV_NEIGH_DUP))
1334 ret = BATADV_ORIG_DUP;
1337 /* if the window moved, set the update flag. */
1338 bitmap = neigh_ifinfo->bat_iv.real_bits;
1339 need_update |= batadv_bit_get_packet(bat_priv, bitmap,
1340 seq_diff, set_mark);
1342 packet_count = bitmap_weight(bitmap,
1343 BATADV_TQ_LOCAL_WINDOW_SIZE);
1344 neigh_ifinfo->bat_iv.real_packet_count = packet_count;
1345 batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
1350 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1351 "%s updating last_seqno: old %u, new %u\n",
1352 if_outgoing ? if_outgoing->net_dev->name : "DEFAULT",
1353 orig_ifinfo->last_real_seqno, seqno);
1354 orig_ifinfo->last_real_seqno = seqno;
1358 spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
1359 batadv_orig_node_free_ref(orig_node);
1361 batadv_orig_ifinfo_free_ref(orig_ifinfo);
1367 * batadv_iv_ogm_process_per_outif - process a batman iv OGM for an outgoing if
1368 * @skb: the skb containing the OGM
1369 * @orig_node: the (cached) orig node for the originator of this OGM
1370 * @if_incoming: the interface where this packet was received
1371 * @if_outgoing: the interface for which the packet should be considered
1374 batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset,
1375 struct batadv_orig_node *orig_node,
1376 struct batadv_hard_iface *if_incoming,
1377 struct batadv_hard_iface *if_outgoing)
1379 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1380 struct batadv_neigh_node *router = NULL, *router_router = NULL;
1381 struct batadv_orig_node *orig_neigh_node;
1382 struct batadv_orig_ifinfo *orig_ifinfo;
1383 struct batadv_neigh_node *orig_neigh_router = NULL;
1384 struct batadv_neigh_ifinfo *router_ifinfo = NULL;
1385 struct batadv_ogm_packet *ogm_packet;
1386 enum batadv_dup_status dup_status;
1387 bool is_from_best_next_hop = false;
1388 bool is_single_hop_neigh = false;
1389 bool sameseq, similar_ttl;
1390 struct sk_buff *skb_priv;
1391 struct ethhdr *ethhdr;
1392 uint8_t *prev_sender;
1395 /* create a private copy of the skb, as some functions change tq value
1398 skb_priv = skb_copy(skb, GFP_ATOMIC);
1402 ethhdr = eth_hdr(skb_priv);
1403 ogm_packet = (struct batadv_ogm_packet *)(skb_priv->data + ogm_offset);
1405 dup_status = batadv_iv_ogm_update_seqnos(ethhdr, ogm_packet,
1406 if_incoming, if_outgoing);
1407 if (batadv_compare_eth(ethhdr->h_source, ogm_packet->orig))
1408 is_single_hop_neigh = true;
1410 if (dup_status == BATADV_PROTECTED) {
1411 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1412 "Drop packet: packet within seqno protection time (sender: %pM)\n",
1417 if (ogm_packet->tq == 0) {
1418 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1419 "Drop packet: originator packet with tq equal 0\n");
1423 router = batadv_orig_router_get(orig_node, if_outgoing);
1425 router_router = batadv_orig_router_get(router->orig_node,
1427 router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
1430 if ((router_ifinfo && router_ifinfo->bat_iv.tq_avg != 0) &&
1431 (batadv_compare_eth(router->addr, ethhdr->h_source)))
1432 is_from_best_next_hop = true;
1434 prev_sender = ogm_packet->prev_sender;
1435 /* avoid temporary routing loops */
1436 if (router && router_router &&
1437 (batadv_compare_eth(router->addr, prev_sender)) &&
1438 !(batadv_compare_eth(ogm_packet->orig, prev_sender)) &&
1439 (batadv_compare_eth(router->addr, router_router->addr))) {
1440 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1441 "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1446 if (if_outgoing == BATADV_IF_DEFAULT)
1447 batadv_tvlv_ogm_receive(bat_priv, ogm_packet, orig_node);
1449 /* if sender is a direct neighbor the sender mac equals
1452 if (is_single_hop_neigh)
1453 orig_neigh_node = orig_node;
1455 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1458 if (!orig_neigh_node)
1461 /* Update nc_nodes of the originator */
1462 batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node,
1463 ogm_packet, is_single_hop_neigh);
1465 orig_neigh_router = batadv_orig_router_get(orig_neigh_node,
1468 /* drop packet if sender is not a direct neighbor and if we
1469 * don't route towards it
1471 if (!is_single_hop_neigh && (!orig_neigh_router)) {
1472 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1473 "Drop packet: OGM via unknown neighbor!\n");
1477 is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1478 ogm_packet, if_incoming,
1481 /* update ranking if it is not a duplicate or has the same
1482 * seqno and similar ttl as the non-duplicate
1484 orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
1488 sameseq = orig_ifinfo->last_real_seqno == ntohl(ogm_packet->seqno);
1489 similar_ttl = (orig_ifinfo->last_ttl - 3) <= ogm_packet->ttl;
1491 if (is_bidirect && ((dup_status == BATADV_NO_DUP) ||
1492 (sameseq && similar_ttl))) {
1493 batadv_iv_ogm_orig_update(bat_priv, orig_node,
1494 orig_ifinfo, ethhdr,
1495 ogm_packet, if_incoming,
1496 if_outgoing, dup_status);
1498 batadv_orig_ifinfo_free_ref(orig_ifinfo);
1500 /* only forward for specific interface, not for the default one. */
1501 if (if_outgoing == BATADV_IF_DEFAULT)
1504 /* is single hop (direct) neighbor */
1505 if (is_single_hop_neigh) {
1506 /* OGMs from secondary interfaces should only scheduled once
1507 * per interface where it has been received, not multiple times
1509 if ((ogm_packet->ttl <= 2) &&
1510 (if_incoming != if_outgoing)) {
1511 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1512 "Drop packet: OGM from secondary interface and wrong outgoing interface\n");
1515 /* mark direct link on incoming interface */
1516 batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1517 is_single_hop_neigh,
1518 is_from_best_next_hop, if_incoming,
1521 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1522 "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1526 /* multihop originator */
1528 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1529 "Drop packet: not received via bidirectional link\n");
1533 if (dup_status == BATADV_NEIGH_DUP) {
1534 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1535 "Drop packet: duplicate packet received\n");
1539 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1540 "Forwarding packet: rebroadcast originator packet\n");
1541 batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
1542 is_single_hop_neigh, is_from_best_next_hop,
1543 if_incoming, if_outgoing);
1546 if ((orig_neigh_node) && (!is_single_hop_neigh))
1547 batadv_orig_node_free_ref(orig_neigh_node);
1550 batadv_neigh_ifinfo_free_ref(router_ifinfo);
1552 batadv_neigh_node_free_ref(router);
1554 batadv_neigh_node_free_ref(router_router);
1555 if (orig_neigh_router)
1556 batadv_neigh_node_free_ref(orig_neigh_router);
1558 kfree_skb(skb_priv);
1562 * batadv_iv_ogm_process - process an incoming batman iv OGM
1563 * @skb: the skb containing the OGM
1564 * @ogm_offset: offset to the OGM which should be processed (for aggregates)
1565 * @if_incoming: the interface where this packet was receved
1567 static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset,
1568 struct batadv_hard_iface *if_incoming)
1570 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1571 struct batadv_orig_node *orig_neigh_node, *orig_node;
1572 struct batadv_hard_iface *hard_iface;
1573 struct batadv_ogm_packet *ogm_packet;
1574 uint32_t if_incoming_seqno;
1575 bool has_directlink_flag;
1576 struct ethhdr *ethhdr;
1577 bool is_my_oldorig = false;
1578 bool is_my_addr = false;
1579 bool is_my_orig = false;
1581 ogm_packet = (struct batadv_ogm_packet *)(skb->data + ogm_offset);
1582 ethhdr = eth_hdr(skb);
1584 /* Silently drop when the batman packet is actually not a
1587 * This might happen if a packet is padded (e.g. Ethernet has a
1588 * minimum frame length of 64 byte) and the aggregation interprets
1589 * it as an additional length.
1591 * TODO: A more sane solution would be to have a bit in the
1592 * batadv_ogm_packet to detect whether the packet is the last
1593 * packet in an aggregation. Here we expect that the padding
1594 * is always zero (or not 0x01)
1596 if (ogm_packet->packet_type != BATADV_IV_OGM)
1599 /* could be changed by schedule_own_packet() */
1600 if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
1602 if (ogm_packet->flags & BATADV_DIRECTLINK)
1603 has_directlink_flag = true;
1605 has_directlink_flag = false;
1607 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1608 "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",
1609 ethhdr->h_source, if_incoming->net_dev->name,
1610 if_incoming->net_dev->dev_addr, ogm_packet->orig,
1611 ogm_packet->prev_sender, ntohl(ogm_packet->seqno),
1612 ogm_packet->tq, ogm_packet->ttl,
1613 ogm_packet->version, has_directlink_flag);
1616 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1617 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1620 if (hard_iface->soft_iface != if_incoming->soft_iface)
1623 if (batadv_compare_eth(ethhdr->h_source,
1624 hard_iface->net_dev->dev_addr))
1627 if (batadv_compare_eth(ogm_packet->orig,
1628 hard_iface->net_dev->dev_addr))
1631 if (batadv_compare_eth(ogm_packet->prev_sender,
1632 hard_iface->net_dev->dev_addr))
1633 is_my_oldorig = true;
1638 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1639 "Drop packet: received my own broadcast (sender: %pM)\n",
1645 unsigned long *word;
1651 orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
1653 if (!orig_neigh_node)
1656 /* neighbor has to indicate direct link and it has to
1657 * come via the corresponding interface
1658 * save packet seqno for bidirectional check
1660 if (has_directlink_flag &&
1661 batadv_compare_eth(if_incoming->net_dev->dev_addr,
1662 ogm_packet->orig)) {
1663 if_num = if_incoming->if_num;
1664 offset = if_num * BATADV_NUM_WORDS;
1666 spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1667 word = &(orig_neigh_node->bat_iv.bcast_own[offset]);
1668 bit_pos = if_incoming_seqno - 2;
1669 bit_pos -= ntohl(ogm_packet->seqno);
1670 batadv_set_bit(word, bit_pos);
1671 weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num];
1672 *weight = bitmap_weight(word,
1673 BATADV_TQ_LOCAL_WINDOW_SIZE);
1674 spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
1677 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1678 "Drop packet: originator packet from myself (via neighbor)\n");
1679 batadv_orig_node_free_ref(orig_neigh_node);
1683 if (is_my_oldorig) {
1684 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1685 "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1690 if (ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
1691 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1692 "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1697 orig_node = batadv_iv_ogm_orig_get(bat_priv, ogm_packet->orig);
1701 batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1702 if_incoming, BATADV_IF_DEFAULT);
1705 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1706 if (hard_iface->if_status != BATADV_IF_ACTIVE)
1709 if (hard_iface->soft_iface != bat_priv->soft_iface)
1712 batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
1713 if_incoming, hard_iface);
1717 batadv_orig_node_free_ref(orig_node);
1720 static int batadv_iv_ogm_receive(struct sk_buff *skb,
1721 struct batadv_hard_iface *if_incoming)
1723 struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1724 struct batadv_ogm_packet *ogm_packet;
1725 uint8_t *packet_pos;
1729 ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
1733 /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1734 * that does not have B.A.T.M.A.N. IV enabled ?
1736 if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
1739 batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1740 batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
1741 skb->len + ETH_HLEN);
1744 ogm_packet = (struct batadv_ogm_packet *)skb->data;
1746 /* unpack the aggregated packets and process them one by one */
1747 while (batadv_iv_ogm_aggr_packet(ogm_offset, skb_headlen(skb),
1748 ogm_packet->tvlv_len)) {
1749 batadv_iv_ogm_process(skb, ogm_offset, if_incoming);
1751 ogm_offset += BATADV_OGM_HLEN;
1752 ogm_offset += ntohs(ogm_packet->tvlv_len);
1754 packet_pos = skb->data + ogm_offset;
1755 ogm_packet = (struct batadv_ogm_packet *)packet_pos;
1759 return NET_RX_SUCCESS;
1763 * batadv_iv_ogm_orig_print_neigh - print neighbors for the originator table
1764 * @orig_node: the orig_node for which the neighbors are printed
1765 * @if_outgoing: outgoing interface for these entries
1766 * @seq: debugfs table seq_file struct
1768 * Must be called while holding an rcu lock.
1771 batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node *orig_node,
1772 struct batadv_hard_iface *if_outgoing,
1773 struct seq_file *seq)
1775 struct batadv_neigh_node *neigh_node;
1776 struct batadv_neigh_ifinfo *n_ifinfo;
1778 hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
1779 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
1783 seq_printf(seq, " %pM (%3i)",
1785 n_ifinfo->bat_iv.tq_avg);
1787 batadv_neigh_ifinfo_free_ref(n_ifinfo);
1792 * batadv_iv_ogm_orig_print - print the originator table
1793 * @bat_priv: the bat priv with all the soft interface information
1794 * @seq: debugfs table seq_file struct
1795 * @if_outgoing: the outgoing interface for which this should be printed
1797 static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv,
1798 struct seq_file *seq,
1799 struct batadv_hard_iface *if_outgoing)
1801 struct batadv_neigh_node *neigh_node;
1802 struct batadv_hashtable *hash = bat_priv->orig_hash;
1803 int last_seen_msecs, last_seen_secs;
1804 struct batadv_orig_node *orig_node;
1805 struct batadv_neigh_ifinfo *n_ifinfo;
1806 unsigned long last_seen_jiffies;
1807 struct hlist_head *head;
1808 int batman_count = 0;
1811 seq_printf(seq, " %-15s %s (%s/%i) %17s [%10s]: %20s ...\n",
1812 "Originator", "last-seen", "#", BATADV_TQ_MAX_VALUE,
1813 "Nexthop", "outgoingIF", "Potential nexthops");
1815 for (i = 0; i < hash->size; i++) {
1816 head = &hash->table[i];
1819 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
1820 neigh_node = batadv_orig_router_get(orig_node,
1825 n_ifinfo = batadv_neigh_ifinfo_get(neigh_node,
1830 if (n_ifinfo->bat_iv.tq_avg == 0)
1833 last_seen_jiffies = jiffies - orig_node->last_seen;
1834 last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
1835 last_seen_secs = last_seen_msecs / 1000;
1836 last_seen_msecs = last_seen_msecs % 1000;
1838 seq_printf(seq, "%pM %4i.%03is (%3i) %pM [%10s]:",
1839 orig_node->orig, last_seen_secs,
1840 last_seen_msecs, n_ifinfo->bat_iv.tq_avg,
1842 neigh_node->if_incoming->net_dev->name);
1844 batadv_iv_ogm_orig_print_neigh(orig_node, if_outgoing,
1846 seq_puts(seq, "\n");
1850 batadv_neigh_node_free_ref(neigh_node);
1852 batadv_neigh_ifinfo_free_ref(n_ifinfo);
1857 if (batman_count == 0)
1858 seq_puts(seq, "No batman nodes in range ...\n");
1862 * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors
1863 * @neigh1: the first neighbor object of the comparison
1864 * @if_outgoing1: outgoing interface for the first neighbor
1865 * @neigh2: the second neighbor object of the comparison
1866 * @if_outgoing2: outgoing interface for the second neighbor
1868 * Returns a value less, equal to or greater than 0 if the metric via neigh1 is
1869 * lower, the same as or higher than the metric via neigh2
1871 static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1,
1872 struct batadv_hard_iface *if_outgoing1,
1873 struct batadv_neigh_node *neigh2,
1874 struct batadv_hard_iface *if_outgoing2)
1876 struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
1880 neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
1881 neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
1883 if (!neigh1_ifinfo || !neigh2_ifinfo) {
1888 tq1 = neigh1_ifinfo->bat_iv.tq_avg;
1889 tq2 = neigh2_ifinfo->bat_iv.tq_avg;
1894 batadv_neigh_ifinfo_free_ref(neigh1_ifinfo);
1896 batadv_neigh_ifinfo_free_ref(neigh2_ifinfo);
1902 * batadv_iv_ogm_neigh_is_eob - check if neigh1 is equally good or better than
1903 * neigh2 from the metric prospective
1904 * @neigh1: the first neighbor object of the comparison
1905 * @if_outgoing: outgoing interface for the first neighbor
1906 * @neigh2: the second neighbor object of the comparison
1907 * @if_outgoing2: outgoing interface for the second neighbor
1909 * Returns true if the metric via neigh1 is equally good or better than
1910 * the metric via neigh2, false otherwise.
1913 batadv_iv_ogm_neigh_is_eob(struct batadv_neigh_node *neigh1,
1914 struct batadv_hard_iface *if_outgoing1,
1915 struct batadv_neigh_node *neigh2,
1916 struct batadv_hard_iface *if_outgoing2)
1918 struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
1922 neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
1923 neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
1925 /* we can't say that the metric is better */
1926 if (!neigh1_ifinfo || !neigh2_ifinfo) {
1931 tq1 = neigh1_ifinfo->bat_iv.tq_avg;
1932 tq2 = neigh2_ifinfo->bat_iv.tq_avg;
1933 ret = (tq1 - tq2) > -BATADV_TQ_SIMILARITY_THRESHOLD;
1937 batadv_neigh_ifinfo_free_ref(neigh1_ifinfo);
1939 batadv_neigh_ifinfo_free_ref(neigh2_ifinfo);
1944 static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
1945 .name = "BATMAN_IV",
1946 .bat_iface_enable = batadv_iv_ogm_iface_enable,
1947 .bat_iface_disable = batadv_iv_ogm_iface_disable,
1948 .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
1949 .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
1950 .bat_ogm_schedule = batadv_iv_ogm_schedule,
1951 .bat_ogm_emit = batadv_iv_ogm_emit,
1952 .bat_neigh_cmp = batadv_iv_ogm_neigh_cmp,
1953 .bat_neigh_is_equiv_or_better = batadv_iv_ogm_neigh_is_eob,
1954 .bat_orig_print = batadv_iv_ogm_orig_print,
1955 .bat_orig_free = batadv_iv_ogm_orig_free,
1956 .bat_orig_add_if = batadv_iv_ogm_orig_add_if,
1957 .bat_orig_del_if = batadv_iv_ogm_orig_del_if,
1960 int __init batadv_iv_init(void)
1964 /* batman originator packet */
1965 ret = batadv_recv_handler_register(BATADV_IV_OGM,
1966 batadv_iv_ogm_receive);
1970 ret = batadv_algo_register(&batadv_batman_iv);
1972 goto handler_unregister;
1977 batadv_recv_handler_unregister(BATADV_IV_OGM);