1 /* Copyright (C) 2007-2015 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/>.
21 #include <linux/atomic.h>
22 #include <linux/bitmap.h>
23 #include <linux/bitops.h>
24 #include <linux/bug.h>
25 #include <linux/byteorder/generic.h>
26 #include <linux/cache.h>
27 #include <linux/errno.h>
28 #include <linux/etherdevice.h>
30 #include <linux/if_ether.h>
31 #include <linux/init.h>
32 #include <linux/jiffies.h>
33 #include <linux/list.h>
34 #include <linux/netdevice.h>
35 #include <linux/pkt_sched.h>
36 #include <linux/printk.h>
37 #include <linux/random.h>
38 #include <linux/rculist.h>
39 #include <linux/rcupdate.h>
40 #include <linux/seq_file.h>
41 #include <linux/skbuff.h>
42 #include <linux/slab.h>
43 #include <linux/spinlock.h>
44 #include <linux/stddef.h>
45 #include <linux/string.h>
46 #include <linux/types.h>
47 #include <linux/workqueue.h>
50 #include "hard-interface.h"
52 #include "network-coding.h"
53 #include "originator.h"
57 #include "translation-table.h"
60 * enum batadv_dup_status - duplicate status
61 * @BATADV_NO_DUP: the packet is no duplicate
62 * @BATADV_ORIG_DUP: OGM is a duplicate in the originator (but not for the
64 * @BATADV_NEIGH_DUP: OGM is a duplicate for the neighbor
65 * @BATADV_PROTECTED: originator is currently protected (after reboot)
67 enum batadv_dup_status
{
75 * batadv_ring_buffer_set - update the ring buffer with the given value
76 * @lq_recv: pointer to the ring buffer
77 * @lq_index: index to store the value at
78 * @value: value to store in the ring buffer
80 static void batadv_ring_buffer_set(u8 lq_recv
[], u8
*lq_index
, u8 value
)
82 lq_recv
[*lq_index
] = value
;
83 *lq_index
= (*lq_index
+ 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE
;
87 * batadv_ring_buffer_avg - compute the average of all non-zero values stored
88 * in the given ring buffer
89 * @lq_recv: pointer to the ring buffer
91 * Returns computed average value.
93 static u8
batadv_ring_buffer_avg(const u8 lq_recv
[])
102 while (i
< BATADV_TQ_GLOBAL_WINDOW_SIZE
) {
115 return (u8
)(sum
/ count
);
119 * batadv_iv_ogm_orig_free - free the private resources allocated for this
121 * @orig_node: the orig_node for which the resources have to be free'd
123 static void batadv_iv_ogm_orig_free(struct batadv_orig_node
*orig_node
)
125 kfree(orig_node
->bat_iv
.bcast_own
);
126 kfree(orig_node
->bat_iv
.bcast_own_sum
);
130 * batadv_iv_ogm_orig_add_if - change the private structures of the orig_node to
131 * include the new hard-interface
132 * @orig_node: the orig_node that has to be changed
133 * @max_if_num: the current amount of interfaces
135 * Returns 0 on success, a negative error code otherwise.
137 static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node
*orig_node
,
144 spin_lock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
146 old_size
= (max_if_num
- 1) * sizeof(unsigned long) * BATADV_NUM_WORDS
;
147 data_ptr
= kmalloc_array(max_if_num
,
148 BATADV_NUM_WORDS
* sizeof(unsigned long),
153 memcpy(data_ptr
, orig_node
->bat_iv
.bcast_own
, old_size
);
154 kfree(orig_node
->bat_iv
.bcast_own
);
155 orig_node
->bat_iv
.bcast_own
= data_ptr
;
157 data_ptr
= kmalloc_array(max_if_num
, sizeof(u8
), GFP_ATOMIC
);
159 kfree(orig_node
->bat_iv
.bcast_own
);
163 memcpy(data_ptr
, orig_node
->bat_iv
.bcast_own_sum
,
164 (max_if_num
- 1) * sizeof(u8
));
165 kfree(orig_node
->bat_iv
.bcast_own_sum
);
166 orig_node
->bat_iv
.bcast_own_sum
= data_ptr
;
171 spin_unlock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
177 * batadv_iv_ogm_orig_del_if - change the private structures of the orig_node to
178 * exclude the removed interface
179 * @orig_node: the orig_node that has to be changed
180 * @max_if_num: the current amount of interfaces
181 * @del_if_num: the index of the interface being removed
183 * Returns 0 on success, a negative error code otherwise.
185 static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node
*orig_node
,
186 int max_if_num
, int del_if_num
)
189 size_t chunk_size
, if_offset
;
190 void *data_ptr
= NULL
;
192 spin_lock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
194 /* last interface was removed */
198 chunk_size
= sizeof(unsigned long) * BATADV_NUM_WORDS
;
199 data_ptr
= kmalloc_array(max_if_num
, chunk_size
, GFP_ATOMIC
);
203 /* copy first part */
204 memcpy(data_ptr
, orig_node
->bat_iv
.bcast_own
, del_if_num
* chunk_size
);
206 /* copy second part */
207 if_offset
= (del_if_num
+ 1) * chunk_size
;
208 memcpy((char *)data_ptr
+ del_if_num
* chunk_size
,
209 (uint8_t *)orig_node
->bat_iv
.bcast_own
+ if_offset
,
210 (max_if_num
- del_if_num
) * chunk_size
);
213 kfree(orig_node
->bat_iv
.bcast_own
);
214 orig_node
->bat_iv
.bcast_own
= data_ptr
;
219 data_ptr
= kmalloc_array(max_if_num
, sizeof(u8
), GFP_ATOMIC
);
221 kfree(orig_node
->bat_iv
.bcast_own
);
225 memcpy(data_ptr
, orig_node
->bat_iv
.bcast_own_sum
,
226 del_if_num
* sizeof(u8
));
228 if_offset
= (del_if_num
+ 1) * sizeof(u8
);
229 memcpy((char *)data_ptr
+ del_if_num
* sizeof(u8
),
230 orig_node
->bat_iv
.bcast_own_sum
+ if_offset
,
231 (max_if_num
- del_if_num
) * sizeof(u8
));
234 kfree(orig_node
->bat_iv
.bcast_own_sum
);
235 orig_node
->bat_iv
.bcast_own_sum
= data_ptr
;
239 spin_unlock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
245 * batadv_iv_ogm_orig_get - retrieve or create (if does not exist) an originator
246 * @bat_priv: the bat priv with all the soft interface information
247 * @addr: mac address of the originator
249 * Returns the originator object corresponding to the passed mac address or NULL
251 * If the object does not exists it is created an initialised.
253 static struct batadv_orig_node
*
254 batadv_iv_ogm_orig_get(struct batadv_priv
*bat_priv
, const u8
*addr
)
256 struct batadv_orig_node
*orig_node
;
257 int size
, hash_added
;
259 orig_node
= batadv_orig_hash_find(bat_priv
, addr
);
263 orig_node
= batadv_orig_node_new(bat_priv
, addr
);
267 spin_lock_init(&orig_node
->bat_iv
.ogm_cnt_lock
);
269 size
= bat_priv
->num_ifaces
* sizeof(unsigned long) * BATADV_NUM_WORDS
;
270 orig_node
->bat_iv
.bcast_own
= kzalloc(size
, GFP_ATOMIC
);
271 if (!orig_node
->bat_iv
.bcast_own
)
274 size
= bat_priv
->num_ifaces
* sizeof(u8
);
275 orig_node
->bat_iv
.bcast_own_sum
= kzalloc(size
, GFP_ATOMIC
);
276 if (!orig_node
->bat_iv
.bcast_own_sum
)
279 hash_added
= batadv_hash_add(bat_priv
->orig_hash
, batadv_compare_orig
,
280 batadv_choose_orig
, orig_node
,
281 &orig_node
->hash_entry
);
288 /* free twice, as batadv_orig_node_new sets refcount to 2 */
289 batadv_orig_node_free_ref(orig_node
);
290 batadv_orig_node_free_ref(orig_node
);
295 static struct batadv_neigh_node
*
296 batadv_iv_ogm_neigh_new(struct batadv_hard_iface
*hard_iface
,
297 const u8
*neigh_addr
,
298 struct batadv_orig_node
*orig_node
,
299 struct batadv_orig_node
*orig_neigh
)
301 struct batadv_neigh_node
*neigh_node
;
303 neigh_node
= batadv_neigh_node_new(orig_node
, hard_iface
, neigh_addr
);
307 neigh_node
->orig_node
= orig_neigh
;
313 static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface
*hard_iface
)
315 struct batadv_ogm_packet
*batadv_ogm_packet
;
316 unsigned char *ogm_buff
;
319 /* randomize initial seqno to avoid collision */
320 get_random_bytes(&random_seqno
, sizeof(random_seqno
));
321 atomic_set(&hard_iface
->bat_iv
.ogm_seqno
, random_seqno
);
323 hard_iface
->bat_iv
.ogm_buff_len
= BATADV_OGM_HLEN
;
324 ogm_buff
= kmalloc(hard_iface
->bat_iv
.ogm_buff_len
, GFP_ATOMIC
);
328 hard_iface
->bat_iv
.ogm_buff
= ogm_buff
;
330 batadv_ogm_packet
= (struct batadv_ogm_packet
*)ogm_buff
;
331 batadv_ogm_packet
->packet_type
= BATADV_IV_OGM
;
332 batadv_ogm_packet
->version
= BATADV_COMPAT_VERSION
;
333 batadv_ogm_packet
->ttl
= 2;
334 batadv_ogm_packet
->flags
= BATADV_NO_FLAGS
;
335 batadv_ogm_packet
->reserved
= 0;
336 batadv_ogm_packet
->tq
= BATADV_TQ_MAX_VALUE
;
341 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface
*hard_iface
)
343 kfree(hard_iface
->bat_iv
.ogm_buff
);
344 hard_iface
->bat_iv
.ogm_buff
= NULL
;
347 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface
*hard_iface
)
349 struct batadv_ogm_packet
*batadv_ogm_packet
;
350 unsigned char *ogm_buff
= hard_iface
->bat_iv
.ogm_buff
;
352 batadv_ogm_packet
= (struct batadv_ogm_packet
*)ogm_buff
;
353 ether_addr_copy(batadv_ogm_packet
->orig
,
354 hard_iface
->net_dev
->dev_addr
);
355 ether_addr_copy(batadv_ogm_packet
->prev_sender
,
356 hard_iface
->net_dev
->dev_addr
);
360 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface
*hard_iface
)
362 struct batadv_ogm_packet
*batadv_ogm_packet
;
363 unsigned char *ogm_buff
= hard_iface
->bat_iv
.ogm_buff
;
365 batadv_ogm_packet
= (struct batadv_ogm_packet
*)ogm_buff
;
366 batadv_ogm_packet
->ttl
= BATADV_TTL
;
369 /* when do we schedule our own ogm to be sent */
371 batadv_iv_ogm_emit_send_time(const struct batadv_priv
*bat_priv
)
375 msecs
= atomic_read(&bat_priv
->orig_interval
) - BATADV_JITTER
;
376 msecs
+= prandom_u32() % (2 * BATADV_JITTER
);
378 return jiffies
+ msecs_to_jiffies(msecs
);
381 /* when do we schedule a ogm packet to be sent */
382 static unsigned long batadv_iv_ogm_fwd_send_time(void)
384 return jiffies
+ msecs_to_jiffies(prandom_u32() % (BATADV_JITTER
/ 2));
387 /* apply hop penalty for a normal link */
388 static u8
batadv_hop_penalty(u8 tq
, 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 bool 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 * @directlink: 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
552 * otherwise aggregation is not possible
554 if (!time_before(send_time
, forw_packet
->send_time
) ||
555 !time_after_eq(aggregation_end_time
, forw_packet
->send_time
))
558 if (aggregated_bytes
> BATADV_MAX_AGGREGATION_BYTES
)
561 /* packet is not leaving on the same interface. */
562 if (forw_packet
->if_outgoing
!= if_outgoing
)
565 /* check aggregation compatibility
566 * -> direct link packets are broadcasted on
567 * their interface only
568 * -> aggregate packet if the current packet is
569 * a "global" packet as well as the base
572 primary_if
= batadv_primary_if_get_selected(bat_priv
);
576 /* packets without direct link flag and high TTL
577 * are flooded through the net
580 !(batadv_ogm_packet
->flags
& BATADV_DIRECTLINK
) &&
581 batadv_ogm_packet
->ttl
!= 1 &&
583 /* own packets originating non-primary
584 * interfaces leave only that interface
586 (!forw_packet
->own
||
587 forw_packet
->if_incoming
== primary_if
)) {
592 /* if the incoming packet is sent via this one
593 * interface only - we still can aggregate
596 new_bat_ogm_packet
->ttl
== 1 &&
597 forw_packet
->if_incoming
== if_incoming
&&
599 /* packets from direct neighbors or
600 * own secondary interface packets
601 * (= secondary interface packets in general)
603 (batadv_ogm_packet
->flags
& BATADV_DIRECTLINK
||
605 forw_packet
->if_incoming
!= primary_if
))) {
612 batadv_hardif_free_ref(primary_if
);
617 * batadv_iv_ogm_aggregate_new - create a new aggregated packet and add this
619 * @packet_buff: pointer to the OGM
620 * @packet_len: (total) length of the OGM
621 * @send_time: timestamp (jiffies) when the packet is to be sent
622 * @direct_link: whether this OGM has direct link status
623 * @if_incoming: interface where the packet was received
624 * @if_outgoing: interface for which the retransmission should be considered
625 * @own_packet: true if it is a self-generated ogm
627 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff
,
628 int packet_len
, unsigned long send_time
,
630 struct batadv_hard_iface
*if_incoming
,
631 struct batadv_hard_iface
*if_outgoing
,
634 struct batadv_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
635 struct batadv_forw_packet
*forw_packet_aggr
;
636 unsigned char *skb_buff
;
637 unsigned int skb_size
;
639 if (!atomic_inc_not_zero(&if_incoming
->refcount
))
642 if (!atomic_inc_not_zero(&if_outgoing
->refcount
))
643 goto out_free_incoming
;
645 /* own packet should always be scheduled */
647 if (!batadv_atomic_dec_not_zero(&bat_priv
->batman_queue_left
)) {
648 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
649 "batman packet queue full\n");
650 goto out_free_outgoing
;
654 forw_packet_aggr
= kmalloc(sizeof(*forw_packet_aggr
), GFP_ATOMIC
);
655 if (!forw_packet_aggr
)
658 if (atomic_read(&bat_priv
->aggregated_ogms
) &&
659 packet_len
< BATADV_MAX_AGGREGATION_BYTES
)
660 skb_size
= BATADV_MAX_AGGREGATION_BYTES
;
662 skb_size
= packet_len
;
664 skb_size
+= ETH_HLEN
;
666 forw_packet_aggr
->skb
= netdev_alloc_skb_ip_align(NULL
, skb_size
);
667 if (!forw_packet_aggr
->skb
)
668 goto out_free_forw_packet
;
669 forw_packet_aggr
->skb
->priority
= TC_PRIO_CONTROL
;
670 skb_reserve(forw_packet_aggr
->skb
, ETH_HLEN
);
672 skb_buff
= skb_put(forw_packet_aggr
->skb
, packet_len
);
673 forw_packet_aggr
->packet_len
= packet_len
;
674 memcpy(skb_buff
, packet_buff
, packet_len
);
676 forw_packet_aggr
->own
= own_packet
;
677 forw_packet_aggr
->if_incoming
= if_incoming
;
678 forw_packet_aggr
->if_outgoing
= if_outgoing
;
679 forw_packet_aggr
->num_packets
= 0;
680 forw_packet_aggr
->direct_link_flags
= BATADV_NO_FLAGS
;
681 forw_packet_aggr
->send_time
= send_time
;
683 /* save packet direct link flag status */
685 forw_packet_aggr
->direct_link_flags
|= 1;
687 /* add new packet to packet list */
688 spin_lock_bh(&bat_priv
->forw_bat_list_lock
);
689 hlist_add_head(&forw_packet_aggr
->list
, &bat_priv
->forw_bat_list
);
690 spin_unlock_bh(&bat_priv
->forw_bat_list_lock
);
692 /* start timer for this packet */
693 INIT_DELAYED_WORK(&forw_packet_aggr
->delayed_work
,
694 batadv_send_outstanding_bat_ogm_packet
);
695 queue_delayed_work(batadv_event_workqueue
,
696 &forw_packet_aggr
->delayed_work
,
697 send_time
- jiffies
);
700 out_free_forw_packet
:
701 kfree(forw_packet_aggr
);
704 atomic_inc(&bat_priv
->batman_queue_left
);
706 batadv_hardif_free_ref(if_outgoing
);
708 batadv_hardif_free_ref(if_incoming
);
711 /* aggregate a new packet into the existing ogm packet */
712 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet
*forw_packet_aggr
,
713 const unsigned char *packet_buff
,
714 int packet_len
, bool direct_link
)
716 unsigned char *skb_buff
;
717 unsigned long new_direct_link_flag
;
719 skb_buff
= skb_put(forw_packet_aggr
->skb
, packet_len
);
720 memcpy(skb_buff
, packet_buff
, packet_len
);
721 forw_packet_aggr
->packet_len
+= packet_len
;
722 forw_packet_aggr
->num_packets
++;
724 /* save packet direct link flag status */
726 new_direct_link_flag
= BIT(forw_packet_aggr
->num_packets
);
727 forw_packet_aggr
->direct_link_flags
|= new_direct_link_flag
;
732 * batadv_iv_ogm_queue_add - queue up an OGM for transmission
733 * @bat_priv: the bat priv with all the soft interface information
734 * @packet_buff: pointer to the OGM
735 * @packet_len: (total) length of the OGM
736 * @if_incoming: interface where the packet was received
737 * @if_outgoing: interface for which the retransmission should be considered
738 * @own_packet: true if it is a self-generated ogm
739 * @send_time: timestamp (jiffies) when the packet is to be sent
741 static void batadv_iv_ogm_queue_add(struct batadv_priv
*bat_priv
,
742 unsigned char *packet_buff
,
744 struct batadv_hard_iface
*if_incoming
,
745 struct batadv_hard_iface
*if_outgoing
,
746 int own_packet
, unsigned long send_time
)
748 /* _aggr -> pointer to the packet we want to aggregate with
749 * _pos -> pointer to the position in the queue
751 struct batadv_forw_packet
*forw_packet_aggr
= NULL
;
752 struct batadv_forw_packet
*forw_packet_pos
= NULL
;
753 struct batadv_ogm_packet
*batadv_ogm_packet
;
755 unsigned long max_aggregation_jiffies
;
757 batadv_ogm_packet
= (struct batadv_ogm_packet
*)packet_buff
;
758 direct_link
= !!(batadv_ogm_packet
->flags
& BATADV_DIRECTLINK
);
759 max_aggregation_jiffies
= msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS
);
761 /* find position for the packet in the forward queue */
762 spin_lock_bh(&bat_priv
->forw_bat_list_lock
);
763 /* own packets are not to be aggregated */
764 if (atomic_read(&bat_priv
->aggregated_ogms
) && !own_packet
) {
765 hlist_for_each_entry(forw_packet_pos
,
766 &bat_priv
->forw_bat_list
, list
) {
767 if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet
,
768 bat_priv
, packet_len
,
769 send_time
, direct_link
,
773 forw_packet_aggr
= forw_packet_pos
;
779 /* nothing to aggregate with - either aggregation disabled or no
780 * suitable aggregation packet found
782 if (!forw_packet_aggr
) {
783 /* the following section can run without the lock */
784 spin_unlock_bh(&bat_priv
->forw_bat_list_lock
);
786 /* if we could not aggregate this packet with one of the others
787 * we hold it back for a while, so that it might be aggregated
790 if (!own_packet
&& atomic_read(&bat_priv
->aggregated_ogms
))
791 send_time
+= max_aggregation_jiffies
;
793 batadv_iv_ogm_aggregate_new(packet_buff
, packet_len
,
794 send_time
, direct_link
,
795 if_incoming
, if_outgoing
,
798 batadv_iv_ogm_aggregate(forw_packet_aggr
, packet_buff
,
799 packet_len
, direct_link
);
800 spin_unlock_bh(&bat_priv
->forw_bat_list_lock
);
804 static void batadv_iv_ogm_forward(struct batadv_orig_node
*orig_node
,
805 const struct ethhdr
*ethhdr
,
806 struct batadv_ogm_packet
*batadv_ogm_packet
,
807 bool is_single_hop_neigh
,
808 bool is_from_best_next_hop
,
809 struct batadv_hard_iface
*if_incoming
,
810 struct batadv_hard_iface
*if_outgoing
)
812 struct batadv_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
815 if (batadv_ogm_packet
->ttl
<= 1) {
816 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
, "ttl exceeded\n");
820 if (!is_from_best_next_hop
) {
821 /* Mark the forwarded packet when it is not coming from our
822 * best next hop. We still need to forward the packet for our
823 * neighbor link quality detection to work in case the packet
824 * originated from a single hop neighbor. Otherwise we can
825 * simply drop the ogm.
827 if (is_single_hop_neigh
)
828 batadv_ogm_packet
->flags
|= BATADV_NOT_BEST_NEXT_HOP
;
833 tvlv_len
= ntohs(batadv_ogm_packet
->tvlv_len
);
835 batadv_ogm_packet
->ttl
--;
836 ether_addr_copy(batadv_ogm_packet
->prev_sender
, ethhdr
->h_source
);
838 /* apply hop penalty */
839 batadv_ogm_packet
->tq
= batadv_hop_penalty(batadv_ogm_packet
->tq
,
842 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
843 "Forwarding packet: tq: %i, ttl: %i\n",
844 batadv_ogm_packet
->tq
, batadv_ogm_packet
->ttl
);
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
;
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
= (u32
)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
;
981 struct batadv_neigh_node
*tmp_neigh_node
= NULL
;
982 struct batadv_neigh_node
*router
= NULL
;
983 struct batadv_orig_node
*orig_node_tmp
;
985 u8 sum_orig
, sum_neigh
;
989 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
990 "update_originator(): Searching and updating originator entry of received packet\n");
993 hlist_for_each_entry_rcu(tmp_neigh_node
,
994 &orig_node
->neigh_list
, list
) {
995 neigh_addr
= tmp_neigh_node
->addr
;
996 if (batadv_compare_eth(neigh_addr
, ethhdr
->h_source
) &&
997 tmp_neigh_node
->if_incoming
== if_incoming
&&
998 atomic_inc_not_zero(&tmp_neigh_node
->refcount
)) {
999 if (WARN(neigh_node
, "too many matching neigh_nodes"))
1000 batadv_neigh_node_free_ref(neigh_node
);
1001 neigh_node
= tmp_neigh_node
;
1005 if (dup_status
!= BATADV_NO_DUP
)
1008 /* only update the entry for this outgoing interface */
1009 neigh_ifinfo
= batadv_neigh_ifinfo_get(tmp_neigh_node
,
1014 spin_lock_bh(&tmp_neigh_node
->ifinfo_lock
);
1015 batadv_ring_buffer_set(neigh_ifinfo
->bat_iv
.tq_recv
,
1016 &neigh_ifinfo
->bat_iv
.tq_index
, 0);
1017 tq_avg
= batadv_ring_buffer_avg(neigh_ifinfo
->bat_iv
.tq_recv
);
1018 neigh_ifinfo
->bat_iv
.tq_avg
= tq_avg
;
1019 spin_unlock_bh(&tmp_neigh_node
->ifinfo_lock
);
1021 batadv_neigh_ifinfo_free_ref(neigh_ifinfo
);
1022 neigh_ifinfo
= NULL
;
1026 struct batadv_orig_node
*orig_tmp
;
1028 orig_tmp
= batadv_iv_ogm_orig_get(bat_priv
, ethhdr
->h_source
);
1032 neigh_node
= batadv_iv_ogm_neigh_new(if_incoming
,
1034 orig_node
, orig_tmp
);
1036 batadv_orig_node_free_ref(orig_tmp
);
1040 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1041 "Updating existing last-hop neighbor of originator\n");
1045 neigh_ifinfo
= batadv_neigh_ifinfo_new(neigh_node
, if_outgoing
);
1049 neigh_node
->last_seen
= jiffies
;
1051 spin_lock_bh(&neigh_node
->ifinfo_lock
);
1052 batadv_ring_buffer_set(neigh_ifinfo
->bat_iv
.tq_recv
,
1053 &neigh_ifinfo
->bat_iv
.tq_index
,
1054 batadv_ogm_packet
->tq
);
1055 tq_avg
= batadv_ring_buffer_avg(neigh_ifinfo
->bat_iv
.tq_recv
);
1056 neigh_ifinfo
->bat_iv
.tq_avg
= tq_avg
;
1057 spin_unlock_bh(&neigh_node
->ifinfo_lock
);
1059 if (dup_status
== BATADV_NO_DUP
) {
1060 orig_ifinfo
->last_ttl
= batadv_ogm_packet
->ttl
;
1061 neigh_ifinfo
->last_ttl
= batadv_ogm_packet
->ttl
;
1064 /* if this neighbor already is our next hop there is nothing
1067 router
= batadv_orig_router_get(orig_node
, if_outgoing
);
1068 if (router
== neigh_node
)
1072 router_ifinfo
= batadv_neigh_ifinfo_get(router
, if_outgoing
);
1076 /* if this neighbor does not offer a better TQ we won't
1079 if (router_ifinfo
->bat_iv
.tq_avg
> neigh_ifinfo
->bat_iv
.tq_avg
)
1083 /* if the TQ is the same and the link not more symmetric we
1084 * won't consider it either
1086 if (router_ifinfo
&&
1087 neigh_ifinfo
->bat_iv
.tq_avg
== router_ifinfo
->bat_iv
.tq_avg
) {
1088 orig_node_tmp
= router
->orig_node
;
1089 spin_lock_bh(&orig_node_tmp
->bat_iv
.ogm_cnt_lock
);
1090 if_num
= router
->if_incoming
->if_num
;
1091 sum_orig
= orig_node_tmp
->bat_iv
.bcast_own_sum
[if_num
];
1092 spin_unlock_bh(&orig_node_tmp
->bat_iv
.ogm_cnt_lock
);
1094 orig_node_tmp
= neigh_node
->orig_node
;
1095 spin_lock_bh(&orig_node_tmp
->bat_iv
.ogm_cnt_lock
);
1096 if_num
= neigh_node
->if_incoming
->if_num
;
1097 sum_neigh
= orig_node_tmp
->bat_iv
.bcast_own_sum
[if_num
];
1098 spin_unlock_bh(&orig_node_tmp
->bat_iv
.ogm_cnt_lock
);
1100 if (sum_orig
>= sum_neigh
)
1104 batadv_update_route(bat_priv
, orig_node
, if_outgoing
, neigh_node
);
1111 batadv_neigh_node_free_ref(neigh_node
);
1113 batadv_neigh_node_free_ref(router
);
1115 batadv_neigh_ifinfo_free_ref(neigh_ifinfo
);
1117 batadv_neigh_ifinfo_free_ref(router_ifinfo
);
1121 * batadv_iv_ogm_calc_tq - calculate tq for current received ogm packet
1122 * @orig_node: the orig node who originally emitted the ogm packet
1123 * @orig_neigh_node: the orig node struct of the neighbor who sent the packet
1124 * @batadv_ogm_packet: the ogm packet
1125 * @if_incoming: interface where the packet was received
1126 * @if_outgoing: interface for which the retransmission should be considered
1128 * Returns 1 if the link can be considered bidirectional, 0 otherwise
1130 static int batadv_iv_ogm_calc_tq(struct batadv_orig_node
*orig_node
,
1131 struct batadv_orig_node
*orig_neigh_node
,
1132 struct batadv_ogm_packet
*batadv_ogm_packet
,
1133 struct batadv_hard_iface
*if_incoming
,
1134 struct batadv_hard_iface
*if_outgoing
)
1136 struct batadv_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
1137 struct batadv_neigh_node
*neigh_node
= NULL
, *tmp_neigh_node
;
1138 struct batadv_neigh_ifinfo
*neigh_ifinfo
;
1140 u8 orig_eq_count
, neigh_rq_count
, neigh_rq_inv
, tq_own
;
1141 unsigned int neigh_rq_inv_cube
, neigh_rq_max_cube
;
1142 int tq_asym_penalty
, inv_asym_penalty
, if_num
, ret
= 0;
1143 unsigned int combined_tq
;
1144 int tq_iface_penalty
;
1146 /* find corresponding one hop neighbor */
1148 hlist_for_each_entry_rcu(tmp_neigh_node
,
1149 &orig_neigh_node
->neigh_list
, list
) {
1150 if (!batadv_compare_eth(tmp_neigh_node
->addr
,
1151 orig_neigh_node
->orig
))
1154 if (tmp_neigh_node
->if_incoming
!= if_incoming
)
1157 if (!atomic_inc_not_zero(&tmp_neigh_node
->refcount
))
1160 neigh_node
= tmp_neigh_node
;
1166 neigh_node
= batadv_iv_ogm_neigh_new(if_incoming
,
1167 orig_neigh_node
->orig
,
1174 /* if orig_node is direct neighbor update neigh_node last_seen */
1175 if (orig_node
== orig_neigh_node
)
1176 neigh_node
->last_seen
= jiffies
;
1178 orig_node
->last_seen
= jiffies
;
1180 /* find packet count of corresponding one hop neighbor */
1181 spin_lock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
1182 if_num
= if_incoming
->if_num
;
1183 orig_eq_count
= orig_neigh_node
->bat_iv
.bcast_own_sum
[if_num
];
1184 neigh_ifinfo
= batadv_neigh_ifinfo_new(neigh_node
, if_outgoing
);
1186 neigh_rq_count
= neigh_ifinfo
->bat_iv
.real_packet_count
;
1187 batadv_neigh_ifinfo_free_ref(neigh_ifinfo
);
1191 spin_unlock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
1193 /* pay attention to not get a value bigger than 100 % */
1194 if (orig_eq_count
> neigh_rq_count
)
1195 total_count
= neigh_rq_count
;
1197 total_count
= orig_eq_count
;
1199 /* if we have too few packets (too less data) we set tq_own to zero
1200 * if we receive too few packets it is not considered bidirectional
1202 if (total_count
< BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM
||
1203 neigh_rq_count
< BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM
)
1206 /* neigh_node->real_packet_count is never zero as we
1207 * only purge old information when getting new
1210 tq_own
= (BATADV_TQ_MAX_VALUE
* total_count
) / neigh_rq_count
;
1212 /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
1213 * affect the nearly-symmetric links only a little, but
1214 * punishes asymmetric links more. This will give a value
1215 * between 0 and TQ_MAX_VALUE
1217 neigh_rq_inv
= BATADV_TQ_LOCAL_WINDOW_SIZE
- neigh_rq_count
;
1218 neigh_rq_inv_cube
= neigh_rq_inv
* neigh_rq_inv
* neigh_rq_inv
;
1219 neigh_rq_max_cube
= BATADV_TQ_LOCAL_WINDOW_SIZE
*
1220 BATADV_TQ_LOCAL_WINDOW_SIZE
*
1221 BATADV_TQ_LOCAL_WINDOW_SIZE
;
1222 inv_asym_penalty
= BATADV_TQ_MAX_VALUE
* neigh_rq_inv_cube
;
1223 inv_asym_penalty
/= neigh_rq_max_cube
;
1224 tq_asym_penalty
= BATADV_TQ_MAX_VALUE
- inv_asym_penalty
;
1226 /* penalize if the OGM is forwarded on the same interface. WiFi
1227 * interfaces and other half duplex devices suffer from throughput
1228 * drops as they can't send and receive at the same time.
1230 tq_iface_penalty
= BATADV_TQ_MAX_VALUE
;
1231 if (if_outgoing
&& (if_incoming
== if_outgoing
) &&
1232 batadv_is_wifi_netdev(if_outgoing
->net_dev
))
1233 tq_iface_penalty
= batadv_hop_penalty(BATADV_TQ_MAX_VALUE
,
1236 combined_tq
= batadv_ogm_packet
->tq
*
1240 combined_tq
/= BATADV_TQ_MAX_VALUE
*
1241 BATADV_TQ_MAX_VALUE
*
1242 BATADV_TQ_MAX_VALUE
;
1243 batadv_ogm_packet
->tq
= combined_tq
;
1245 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1246 "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",
1247 orig_node
->orig
, orig_neigh_node
->orig
, total_count
,
1248 neigh_rq_count
, tq_own
, tq_asym_penalty
, tq_iface_penalty
,
1249 batadv_ogm_packet
->tq
, if_incoming
->net_dev
->name
,
1250 if_outgoing
? if_outgoing
->net_dev
->name
: "DEFAULT");
1252 /* if link has the minimum required transmission quality
1253 * consider it bidirectional
1255 if (batadv_ogm_packet
->tq
>= BATADV_TQ_TOTAL_BIDRECT_LIMIT
)
1260 batadv_neigh_node_free_ref(neigh_node
);
1265 * batadv_iv_ogm_update_seqnos - process a batman packet for all interfaces,
1266 * adjust the sequence number and find out whether it is a duplicate
1267 * @ethhdr: ethernet header of the packet
1268 * @batadv_ogm_packet: OGM packet to be considered
1269 * @if_incoming: interface on which the OGM packet was received
1270 * @if_outgoing: interface for which the retransmission should be considered
1272 * Returns duplicate status as enum batadv_dup_status
1274 static enum batadv_dup_status
1275 batadv_iv_ogm_update_seqnos(const struct ethhdr
*ethhdr
,
1276 const struct batadv_ogm_packet
*batadv_ogm_packet
,
1277 const struct batadv_hard_iface
*if_incoming
,
1278 struct batadv_hard_iface
*if_outgoing
)
1280 struct batadv_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
1281 struct batadv_orig_node
*orig_node
;
1282 struct batadv_orig_ifinfo
*orig_ifinfo
= NULL
;
1283 struct batadv_neigh_node
*neigh_node
;
1284 struct batadv_neigh_ifinfo
*neigh_ifinfo
;
1287 int need_update
= 0;
1289 enum batadv_dup_status ret
= BATADV_NO_DUP
;
1290 u32 seqno
= ntohl(batadv_ogm_packet
->seqno
);
1293 unsigned long *bitmap
;
1295 orig_node
= batadv_iv_ogm_orig_get(bat_priv
, batadv_ogm_packet
->orig
);
1297 return BATADV_NO_DUP
;
1299 orig_ifinfo
= batadv_orig_ifinfo_new(orig_node
, if_outgoing
);
1300 if (WARN_ON(!orig_ifinfo
)) {
1301 batadv_orig_node_free_ref(orig_node
);
1305 spin_lock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
1306 seq_diff
= seqno
- orig_ifinfo
->last_real_seqno
;
1308 /* signalize caller that the packet is to be dropped. */
1309 if (!hlist_empty(&orig_node
->neigh_list
) &&
1310 batadv_window_protected(bat_priv
, seq_diff
,
1311 &orig_ifinfo
->batman_seqno_reset
)) {
1312 ret
= BATADV_PROTECTED
;
1317 hlist_for_each_entry_rcu(neigh_node
, &orig_node
->neigh_list
, list
) {
1318 neigh_ifinfo
= batadv_neigh_ifinfo_new(neigh_node
,
1323 neigh_addr
= neigh_node
->addr
;
1324 is_dup
= batadv_test_bit(neigh_ifinfo
->bat_iv
.real_bits
,
1325 orig_ifinfo
->last_real_seqno
,
1328 if (batadv_compare_eth(neigh_addr
, ethhdr
->h_source
) &&
1329 neigh_node
->if_incoming
== if_incoming
) {
1332 ret
= BATADV_NEIGH_DUP
;
1335 if (is_dup
&& (ret
!= BATADV_NEIGH_DUP
))
1336 ret
= BATADV_ORIG_DUP
;
1339 /* if the window moved, set the update flag. */
1340 bitmap
= neigh_ifinfo
->bat_iv
.real_bits
;
1341 need_update
|= batadv_bit_get_packet(bat_priv
, bitmap
,
1342 seq_diff
, set_mark
);
1344 packet_count
= bitmap_weight(bitmap
,
1345 BATADV_TQ_LOCAL_WINDOW_SIZE
);
1346 neigh_ifinfo
->bat_iv
.real_packet_count
= packet_count
;
1347 batadv_neigh_ifinfo_free_ref(neigh_ifinfo
);
1352 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1353 "%s updating last_seqno: old %u, new %u\n",
1354 if_outgoing
? if_outgoing
->net_dev
->name
: "DEFAULT",
1355 orig_ifinfo
->last_real_seqno
, seqno
);
1356 orig_ifinfo
->last_real_seqno
= seqno
;
1360 spin_unlock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
1361 batadv_orig_node_free_ref(orig_node
);
1362 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 * @ogm_offset: offset from skb->data to start of ogm header
1370 * @orig_node: the (cached) orig node for the originator of this OGM
1371 * @if_incoming: the interface where this packet was received
1372 * @if_outgoing: the interface for which the packet should be considered
1375 batadv_iv_ogm_process_per_outif(const struct sk_buff
*skb
, int ogm_offset
,
1376 struct batadv_orig_node
*orig_node
,
1377 struct batadv_hard_iface
*if_incoming
,
1378 struct batadv_hard_iface
*if_outgoing
)
1380 struct batadv_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
1381 struct batadv_hardif_neigh_node
*hardif_neigh
= NULL
;
1382 struct batadv_neigh_node
*router
= NULL
;
1383 struct batadv_neigh_node
*router_router
= NULL
;
1384 struct batadv_orig_node
*orig_neigh_node
;
1385 struct batadv_orig_ifinfo
*orig_ifinfo
;
1386 struct batadv_neigh_node
*orig_neigh_router
= NULL
;
1387 struct batadv_neigh_ifinfo
*router_ifinfo
= NULL
;
1388 struct batadv_ogm_packet
*ogm_packet
;
1389 enum batadv_dup_status dup_status
;
1390 bool is_from_best_next_hop
= false;
1391 bool is_single_hop_neigh
= false;
1392 bool sameseq
, similar_ttl
;
1393 struct sk_buff
*skb_priv
;
1394 struct ethhdr
*ethhdr
;
1398 /* create a private copy of the skb, as some functions change tq value
1401 skb_priv
= skb_copy(skb
, GFP_ATOMIC
);
1405 ethhdr
= eth_hdr(skb_priv
);
1406 ogm_packet
= (struct batadv_ogm_packet
*)(skb_priv
->data
+ ogm_offset
);
1408 dup_status
= batadv_iv_ogm_update_seqnos(ethhdr
, ogm_packet
,
1409 if_incoming
, if_outgoing
);
1410 if (batadv_compare_eth(ethhdr
->h_source
, ogm_packet
->orig
))
1411 is_single_hop_neigh
= true;
1413 if (dup_status
== BATADV_PROTECTED
) {
1414 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1415 "Drop packet: packet within seqno protection time (sender: %pM)\n",
1420 if (ogm_packet
->tq
== 0) {
1421 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1422 "Drop packet: originator packet with tq equal 0\n");
1426 if (is_single_hop_neigh
) {
1427 hardif_neigh
= batadv_hardif_neigh_get(if_incoming
,
1430 hardif_neigh
->last_seen
= jiffies
;
1433 router
= batadv_orig_router_get(orig_node
, if_outgoing
);
1435 router_router
= batadv_orig_router_get(router
->orig_node
,
1437 router_ifinfo
= batadv_neigh_ifinfo_get(router
, if_outgoing
);
1440 if ((router_ifinfo
&& router_ifinfo
->bat_iv
.tq_avg
!= 0) &&
1441 (batadv_compare_eth(router
->addr
, ethhdr
->h_source
)))
1442 is_from_best_next_hop
= true;
1444 prev_sender
= ogm_packet
->prev_sender
;
1445 /* avoid temporary routing loops */
1446 if (router
&& router_router
&&
1447 (batadv_compare_eth(router
->addr
, prev_sender
)) &&
1448 !(batadv_compare_eth(ogm_packet
->orig
, prev_sender
)) &&
1449 (batadv_compare_eth(router
->addr
, router_router
->addr
))) {
1450 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1451 "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1456 if (if_outgoing
== BATADV_IF_DEFAULT
)
1457 batadv_tvlv_ogm_receive(bat_priv
, ogm_packet
, orig_node
);
1459 /* if sender is a direct neighbor the sender mac equals
1462 if (is_single_hop_neigh
)
1463 orig_neigh_node
= orig_node
;
1465 orig_neigh_node
= batadv_iv_ogm_orig_get(bat_priv
,
1468 if (!orig_neigh_node
)
1471 /* Update nc_nodes of the originator */
1472 batadv_nc_update_nc_node(bat_priv
, orig_node
, orig_neigh_node
,
1473 ogm_packet
, is_single_hop_neigh
);
1475 orig_neigh_router
= batadv_orig_router_get(orig_neigh_node
,
1478 /* drop packet if sender is not a direct neighbor and if we
1479 * don't route towards it
1481 if (!is_single_hop_neigh
&& (!orig_neigh_router
)) {
1482 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1483 "Drop packet: OGM via unknown neighbor!\n");
1487 is_bidirect
= batadv_iv_ogm_calc_tq(orig_node
, orig_neigh_node
,
1488 ogm_packet
, if_incoming
,
1491 /* update ranking if it is not a duplicate or has the same
1492 * seqno and similar ttl as the non-duplicate
1494 orig_ifinfo
= batadv_orig_ifinfo_new(orig_node
, if_outgoing
);
1498 sameseq
= orig_ifinfo
->last_real_seqno
== ntohl(ogm_packet
->seqno
);
1499 similar_ttl
= (orig_ifinfo
->last_ttl
- 3) <= ogm_packet
->ttl
;
1501 if (is_bidirect
&& ((dup_status
== BATADV_NO_DUP
) ||
1502 (sameseq
&& similar_ttl
))) {
1503 batadv_iv_ogm_orig_update(bat_priv
, orig_node
,
1504 orig_ifinfo
, ethhdr
,
1505 ogm_packet
, if_incoming
,
1506 if_outgoing
, dup_status
);
1508 batadv_orig_ifinfo_free_ref(orig_ifinfo
);
1510 /* only forward for specific interface, not for the default one. */
1511 if (if_outgoing
== BATADV_IF_DEFAULT
)
1514 /* is single hop (direct) neighbor */
1515 if (is_single_hop_neigh
) {
1516 /* OGMs from secondary interfaces should only scheduled once
1517 * per interface where it has been received, not multiple times
1519 if ((ogm_packet
->ttl
<= 2) &&
1520 (if_incoming
!= if_outgoing
)) {
1521 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1522 "Drop packet: OGM from secondary interface and wrong outgoing interface\n");
1525 /* mark direct link on incoming interface */
1526 batadv_iv_ogm_forward(orig_node
, ethhdr
, ogm_packet
,
1527 is_single_hop_neigh
,
1528 is_from_best_next_hop
, if_incoming
,
1531 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1532 "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1536 /* multihop originator */
1538 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1539 "Drop packet: not received via bidirectional link\n");
1543 if (dup_status
== BATADV_NEIGH_DUP
) {
1544 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1545 "Drop packet: duplicate packet received\n");
1549 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1550 "Forwarding packet: rebroadcast originator packet\n");
1551 batadv_iv_ogm_forward(orig_node
, ethhdr
, ogm_packet
,
1552 is_single_hop_neigh
, is_from_best_next_hop
,
1553 if_incoming
, if_outgoing
);
1556 if ((orig_neigh_node
) && (!is_single_hop_neigh
))
1557 batadv_orig_node_free_ref(orig_neigh_node
);
1560 batadv_neigh_ifinfo_free_ref(router_ifinfo
);
1562 batadv_neigh_node_free_ref(router
);
1564 batadv_neigh_node_free_ref(router_router
);
1565 if (orig_neigh_router
)
1566 batadv_neigh_node_free_ref(orig_neigh_router
);
1568 batadv_hardif_neigh_free_ref(hardif_neigh
);
1570 kfree_skb(skb_priv
);
1574 * batadv_iv_ogm_process - process an incoming batman iv OGM
1575 * @skb: the skb containing the OGM
1576 * @ogm_offset: offset to the OGM which should be processed (for aggregates)
1577 * @if_incoming: the interface where this packet was receved
1579 static void batadv_iv_ogm_process(const struct sk_buff
*skb
, int ogm_offset
,
1580 struct batadv_hard_iface
*if_incoming
)
1582 struct batadv_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
1583 struct batadv_orig_node
*orig_neigh_node
, *orig_node
;
1584 struct batadv_hard_iface
*hard_iface
;
1585 struct batadv_ogm_packet
*ogm_packet
;
1586 u32 if_incoming_seqno
;
1587 bool has_directlink_flag
;
1588 struct ethhdr
*ethhdr
;
1589 bool is_my_oldorig
= false;
1590 bool is_my_addr
= false;
1591 bool is_my_orig
= false;
1593 ogm_packet
= (struct batadv_ogm_packet
*)(skb
->data
+ ogm_offset
);
1594 ethhdr
= eth_hdr(skb
);
1596 /* Silently drop when the batman packet is actually not a
1599 * This might happen if a packet is padded (e.g. Ethernet has a
1600 * minimum frame length of 64 byte) and the aggregation interprets
1601 * it as an additional length.
1603 * TODO: A more sane solution would be to have a bit in the
1604 * batadv_ogm_packet to detect whether the packet is the last
1605 * packet in an aggregation. Here we expect that the padding
1606 * is always zero (or not 0x01)
1608 if (ogm_packet
->packet_type
!= BATADV_IV_OGM
)
1611 /* could be changed by schedule_own_packet() */
1612 if_incoming_seqno
= atomic_read(&if_incoming
->bat_iv
.ogm_seqno
);
1614 if (ogm_packet
->flags
& BATADV_DIRECTLINK
)
1615 has_directlink_flag
= true;
1617 has_directlink_flag
= false;
1619 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1620 "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",
1621 ethhdr
->h_source
, if_incoming
->net_dev
->name
,
1622 if_incoming
->net_dev
->dev_addr
, ogm_packet
->orig
,
1623 ogm_packet
->prev_sender
, ntohl(ogm_packet
->seqno
),
1624 ogm_packet
->tq
, ogm_packet
->ttl
,
1625 ogm_packet
->version
, has_directlink_flag
);
1628 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
1629 if (hard_iface
->if_status
!= BATADV_IF_ACTIVE
)
1632 if (hard_iface
->soft_iface
!= if_incoming
->soft_iface
)
1635 if (batadv_compare_eth(ethhdr
->h_source
,
1636 hard_iface
->net_dev
->dev_addr
))
1639 if (batadv_compare_eth(ogm_packet
->orig
,
1640 hard_iface
->net_dev
->dev_addr
))
1643 if (batadv_compare_eth(ogm_packet
->prev_sender
,
1644 hard_iface
->net_dev
->dev_addr
))
1645 is_my_oldorig
= true;
1650 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1651 "Drop packet: received my own broadcast (sender: %pM)\n",
1657 unsigned long *word
;
1663 orig_neigh_node
= batadv_iv_ogm_orig_get(bat_priv
,
1665 if (!orig_neigh_node
)
1668 /* neighbor has to indicate direct link and it has to
1669 * come via the corresponding interface
1670 * save packet seqno for bidirectional check
1672 if (has_directlink_flag
&&
1673 batadv_compare_eth(if_incoming
->net_dev
->dev_addr
,
1674 ogm_packet
->orig
)) {
1675 if_num
= if_incoming
->if_num
;
1676 offset
= if_num
* BATADV_NUM_WORDS
;
1678 spin_lock_bh(&orig_neigh_node
->bat_iv
.ogm_cnt_lock
);
1679 word
= &orig_neigh_node
->bat_iv
.bcast_own
[offset
];
1680 bit_pos
= if_incoming_seqno
- 2;
1681 bit_pos
-= ntohl(ogm_packet
->seqno
);
1682 batadv_set_bit(word
, bit_pos
);
1683 weight
= &orig_neigh_node
->bat_iv
.bcast_own_sum
[if_num
];
1684 *weight
= bitmap_weight(word
,
1685 BATADV_TQ_LOCAL_WINDOW_SIZE
);
1686 spin_unlock_bh(&orig_neigh_node
->bat_iv
.ogm_cnt_lock
);
1689 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1690 "Drop packet: originator packet from myself (via neighbor)\n");
1691 batadv_orig_node_free_ref(orig_neigh_node
);
1695 if (is_my_oldorig
) {
1696 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1697 "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1702 if (ogm_packet
->flags
& BATADV_NOT_BEST_NEXT_HOP
) {
1703 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1704 "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1709 orig_node
= batadv_iv_ogm_orig_get(bat_priv
, ogm_packet
->orig
);
1713 batadv_iv_ogm_process_per_outif(skb
, ogm_offset
, orig_node
,
1714 if_incoming
, BATADV_IF_DEFAULT
);
1717 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
1718 if (hard_iface
->if_status
!= BATADV_IF_ACTIVE
)
1721 if (hard_iface
->soft_iface
!= bat_priv
->soft_iface
)
1724 batadv_iv_ogm_process_per_outif(skb
, ogm_offset
, orig_node
,
1725 if_incoming
, hard_iface
);
1729 batadv_orig_node_free_ref(orig_node
);
1732 static int batadv_iv_ogm_receive(struct sk_buff
*skb
,
1733 struct batadv_hard_iface
*if_incoming
)
1735 struct batadv_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
1736 struct batadv_ogm_packet
*ogm_packet
;
1741 ret
= batadv_check_management_packet(skb
, if_incoming
, BATADV_OGM_HLEN
);
1745 /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1746 * that does not have B.A.T.M.A.N. IV enabled ?
1748 if (bat_priv
->bat_algo_ops
->bat_ogm_emit
!= batadv_iv_ogm_emit
)
1751 batadv_inc_counter(bat_priv
, BATADV_CNT_MGMT_RX
);
1752 batadv_add_counter(bat_priv
, BATADV_CNT_MGMT_RX_BYTES
,
1753 skb
->len
+ ETH_HLEN
);
1756 ogm_packet
= (struct batadv_ogm_packet
*)skb
->data
;
1758 /* unpack the aggregated packets and process them one by one */
1759 while (batadv_iv_ogm_aggr_packet(ogm_offset
, skb_headlen(skb
),
1760 ogm_packet
->tvlv_len
)) {
1761 batadv_iv_ogm_process(skb
, ogm_offset
, if_incoming
);
1763 ogm_offset
+= BATADV_OGM_HLEN
;
1764 ogm_offset
+= ntohs(ogm_packet
->tvlv_len
);
1766 packet_pos
= skb
->data
+ ogm_offset
;
1767 ogm_packet
= (struct batadv_ogm_packet
*)packet_pos
;
1771 return NET_RX_SUCCESS
;
1775 * batadv_iv_ogm_orig_print_neigh - print neighbors for the originator table
1776 * @orig_node: the orig_node for which the neighbors are printed
1777 * @if_outgoing: outgoing interface for these entries
1778 * @seq: debugfs table seq_file struct
1780 * Must be called while holding an rcu lock.
1783 batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node
*orig_node
,
1784 struct batadv_hard_iface
*if_outgoing
,
1785 struct seq_file
*seq
)
1787 struct batadv_neigh_node
*neigh_node
;
1788 struct batadv_neigh_ifinfo
*n_ifinfo
;
1790 hlist_for_each_entry_rcu(neigh_node
, &orig_node
->neigh_list
, list
) {
1791 n_ifinfo
= batadv_neigh_ifinfo_get(neigh_node
, if_outgoing
);
1795 seq_printf(seq
, " %pM (%3i)",
1797 n_ifinfo
->bat_iv
.tq_avg
);
1799 batadv_neigh_ifinfo_free_ref(n_ifinfo
);
1804 * batadv_iv_ogm_orig_print - print the originator table
1805 * @bat_priv: the bat priv with all the soft interface information
1806 * @seq: debugfs table seq_file struct
1807 * @if_outgoing: the outgoing interface for which this should be printed
1809 static void batadv_iv_ogm_orig_print(struct batadv_priv
*bat_priv
,
1810 struct seq_file
*seq
,
1811 struct batadv_hard_iface
*if_outgoing
)
1813 struct batadv_neigh_node
*neigh_node
;
1814 struct batadv_hashtable
*hash
= bat_priv
->orig_hash
;
1815 int last_seen_msecs
, last_seen_secs
;
1816 struct batadv_orig_node
*orig_node
;
1817 struct batadv_neigh_ifinfo
*n_ifinfo
;
1818 unsigned long last_seen_jiffies
;
1819 struct hlist_head
*head
;
1820 int batman_count
= 0;
1823 seq_printf(seq
, " %-15s %s (%s/%i) %17s [%10s]: %20s ...\n",
1824 "Originator", "last-seen", "#", BATADV_TQ_MAX_VALUE
,
1825 "Nexthop", "outgoingIF", "Potential nexthops");
1827 for (i
= 0; i
< hash
->size
; i
++) {
1828 head
= &hash
->table
[i
];
1831 hlist_for_each_entry_rcu(orig_node
, head
, hash_entry
) {
1832 neigh_node
= batadv_orig_router_get(orig_node
,
1837 n_ifinfo
= batadv_neigh_ifinfo_get(neigh_node
,
1842 if (n_ifinfo
->bat_iv
.tq_avg
== 0)
1845 last_seen_jiffies
= jiffies
- orig_node
->last_seen
;
1846 last_seen_msecs
= jiffies_to_msecs(last_seen_jiffies
);
1847 last_seen_secs
= last_seen_msecs
/ 1000;
1848 last_seen_msecs
= last_seen_msecs
% 1000;
1850 seq_printf(seq
, "%pM %4i.%03is (%3i) %pM [%10s]:",
1851 orig_node
->orig
, last_seen_secs
,
1852 last_seen_msecs
, n_ifinfo
->bat_iv
.tq_avg
,
1854 neigh_node
->if_incoming
->net_dev
->name
);
1856 batadv_iv_ogm_orig_print_neigh(orig_node
, if_outgoing
,
1858 seq_puts(seq
, "\n");
1862 batadv_neigh_node_free_ref(neigh_node
);
1864 batadv_neigh_ifinfo_free_ref(n_ifinfo
);
1869 if (batman_count
== 0)
1870 seq_puts(seq
, "No batman nodes in range ...\n");
1874 * batadv_iv_hardif_neigh_print - print a single hop neighbour node
1875 * @seq: neighbour table seq_file struct
1876 * @hardif_neigh: hardif neighbour information
1879 batadv_iv_hardif_neigh_print(struct seq_file
*seq
,
1880 struct batadv_hardif_neigh_node
*hardif_neigh
)
1882 int last_secs
, last_msecs
;
1884 last_secs
= jiffies_to_msecs(jiffies
- hardif_neigh
->last_seen
) / 1000;
1885 last_msecs
= jiffies_to_msecs(jiffies
- hardif_neigh
->last_seen
) % 1000;
1887 seq_printf(seq
, " %10s %pM %4i.%03is\n",
1888 hardif_neigh
->if_incoming
->net_dev
->name
,
1889 hardif_neigh
->addr
, last_secs
, last_msecs
);
1893 * batadv_iv_ogm_neigh_print - print the single hop neighbour list
1894 * @bat_priv: the bat priv with all the soft interface information
1895 * @seq: neighbour table seq_file struct
1897 static void batadv_iv_neigh_print(struct batadv_priv
*bat_priv
,
1898 struct seq_file
*seq
)
1900 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
1901 struct batadv_hardif_neigh_node
*hardif_neigh
;
1902 struct batadv_hard_iface
*hard_iface
;
1903 int batman_count
= 0;
1905 seq_printf(seq
, " %10s %-13s %s\n",
1906 "IF", "Neighbor", "last-seen");
1909 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
1910 if (hard_iface
->soft_iface
!= net_dev
)
1913 hlist_for_each_entry_rcu(hardif_neigh
,
1914 &hard_iface
->neigh_list
, list
) {
1915 batadv_iv_hardif_neigh_print(seq
, hardif_neigh
);
1921 if (batman_count
== 0)
1922 seq_puts(seq
, "No batman nodes in range ...\n");
1926 * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors
1927 * @neigh1: the first neighbor object of the comparison
1928 * @if_outgoing1: outgoing interface for the first neighbor
1929 * @neigh2: the second neighbor object of the comparison
1930 * @if_outgoing2: outgoing interface for the second neighbor
1932 * Returns a value less, equal to or greater than 0 if the metric via neigh1 is
1933 * lower, the same as or higher than the metric via neigh2
1935 static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node
*neigh1
,
1936 struct batadv_hard_iface
*if_outgoing1
,
1937 struct batadv_neigh_node
*neigh2
,
1938 struct batadv_hard_iface
*if_outgoing2
)
1940 struct batadv_neigh_ifinfo
*neigh1_ifinfo
, *neigh2_ifinfo
;
1944 neigh1_ifinfo
= batadv_neigh_ifinfo_get(neigh1
, if_outgoing1
);
1945 neigh2_ifinfo
= batadv_neigh_ifinfo_get(neigh2
, if_outgoing2
);
1947 if (!neigh1_ifinfo
|| !neigh2_ifinfo
) {
1952 tq1
= neigh1_ifinfo
->bat_iv
.tq_avg
;
1953 tq2
= neigh2_ifinfo
->bat_iv
.tq_avg
;
1958 batadv_neigh_ifinfo_free_ref(neigh1_ifinfo
);
1960 batadv_neigh_ifinfo_free_ref(neigh2_ifinfo
);
1966 * batadv_iv_ogm_neigh_is_sob - check if neigh1 is similarly good or better
1967 * than neigh2 from the metric prospective
1968 * @neigh1: the first neighbor object of the comparison
1969 * @if_outgoing1: outgoing interface for the first neighbor
1970 * @neigh2: the second neighbor object of the comparison
1971 * @if_outgoing2: outgoing interface for the second neighbor
1973 * Returns true if the metric via neigh1 is equally good or better than
1974 * the metric via neigh2, false otherwise.
1977 batadv_iv_ogm_neigh_is_sob(struct batadv_neigh_node
*neigh1
,
1978 struct batadv_hard_iface
*if_outgoing1
,
1979 struct batadv_neigh_node
*neigh2
,
1980 struct batadv_hard_iface
*if_outgoing2
)
1982 struct batadv_neigh_ifinfo
*neigh1_ifinfo
, *neigh2_ifinfo
;
1986 neigh1_ifinfo
= batadv_neigh_ifinfo_get(neigh1
, if_outgoing1
);
1987 neigh2_ifinfo
= batadv_neigh_ifinfo_get(neigh2
, if_outgoing2
);
1989 /* we can't say that the metric is better */
1990 if (!neigh1_ifinfo
|| !neigh2_ifinfo
) {
1995 tq1
= neigh1_ifinfo
->bat_iv
.tq_avg
;
1996 tq2
= neigh2_ifinfo
->bat_iv
.tq_avg
;
1997 ret
= (tq1
- tq2
) > -BATADV_TQ_SIMILARITY_THRESHOLD
;
2001 batadv_neigh_ifinfo_free_ref(neigh1_ifinfo
);
2003 batadv_neigh_ifinfo_free_ref(neigh2_ifinfo
);
2008 static struct batadv_algo_ops batadv_batman_iv __read_mostly
= {
2009 .name
= "BATMAN_IV",
2010 .bat_iface_enable
= batadv_iv_ogm_iface_enable
,
2011 .bat_iface_disable
= batadv_iv_ogm_iface_disable
,
2012 .bat_iface_update_mac
= batadv_iv_ogm_iface_update_mac
,
2013 .bat_primary_iface_set
= batadv_iv_ogm_primary_iface_set
,
2014 .bat_ogm_schedule
= batadv_iv_ogm_schedule
,
2015 .bat_ogm_emit
= batadv_iv_ogm_emit
,
2016 .bat_neigh_cmp
= batadv_iv_ogm_neigh_cmp
,
2017 .bat_neigh_is_similar_or_better
= batadv_iv_ogm_neigh_is_sob
,
2018 .bat_neigh_print
= batadv_iv_neigh_print
,
2019 .bat_orig_print
= batadv_iv_ogm_orig_print
,
2020 .bat_orig_free
= batadv_iv_ogm_orig_free
,
2021 .bat_orig_add_if
= batadv_iv_ogm_orig_add_if
,
2022 .bat_orig_del_if
= batadv_iv_ogm_orig_del_if
,
2025 int __init
batadv_iv_init(void)
2029 /* batman originator packet */
2030 ret
= batadv_recv_handler_register(BATADV_IV_OGM
,
2031 batadv_iv_ogm_receive
);
2035 ret
= batadv_algo_register(&batadv_batman_iv
);
2037 goto handler_unregister
;
2042 batadv_recv_handler_unregister(BATADV_IV_OGM
);