1 /* Copyright (C) 2007-2016 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/kref.h>
35 #include <linux/lockdep.h>
36 #include <linux/netdevice.h>
37 #include <linux/pkt_sched.h>
38 #include <linux/printk.h>
39 #include <linux/random.h>
40 #include <linux/rculist.h>
41 #include <linux/rcupdate.h>
42 #include <linux/seq_file.h>
43 #include <linux/skbuff.h>
44 #include <linux/slab.h>
45 #include <linux/spinlock.h>
46 #include <linux/stddef.h>
47 #include <linux/string.h>
48 #include <linux/types.h>
49 #include <linux/workqueue.h>
52 #include "hard-interface.h"
54 #include "network-coding.h"
55 #include "originator.h"
59 #include "translation-table.h"
62 * enum batadv_dup_status - duplicate status
63 * @BATADV_NO_DUP: the packet is no duplicate
64 * @BATADV_ORIG_DUP: OGM is a duplicate in the originator (but not for the
66 * @BATADV_NEIGH_DUP: OGM is a duplicate for the neighbor
67 * @BATADV_PROTECTED: originator is currently protected (after reboot)
69 enum batadv_dup_status
{
77 * batadv_ring_buffer_set - update the ring buffer with the given value
78 * @lq_recv: pointer to the ring buffer
79 * @lq_index: index to store the value at
80 * @value: value to store in the ring buffer
82 static void batadv_ring_buffer_set(u8 lq_recv
[], u8
*lq_index
, u8 value
)
84 lq_recv
[*lq_index
] = value
;
85 *lq_index
= (*lq_index
+ 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE
;
89 * batadv_ring_buffer_avg - compute the average of all non-zero values stored
90 * in the given ring buffer
91 * @lq_recv: pointer to the ring buffer
93 * Return: computed average value.
95 static u8
batadv_ring_buffer_avg(const u8 lq_recv
[])
104 while (i
< BATADV_TQ_GLOBAL_WINDOW_SIZE
) {
117 return (u8
)(sum
/ count
);
121 * batadv_iv_ogm_orig_free - free the private resources allocated for this
123 * @orig_node: the orig_node for which the resources have to be free'd
125 static void batadv_iv_ogm_orig_free(struct batadv_orig_node
*orig_node
)
127 kfree(orig_node
->bat_iv
.bcast_own
);
128 kfree(orig_node
->bat_iv
.bcast_own_sum
);
132 * batadv_iv_ogm_orig_add_if - change the private structures of the orig_node to
133 * include the new hard-interface
134 * @orig_node: the orig_node that has to be changed
135 * @max_if_num: the current amount of interfaces
137 * Return: 0 on success, a negative error code otherwise.
139 static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node
*orig_node
,
146 spin_lock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
148 old_size
= (max_if_num
- 1) * sizeof(unsigned long) * BATADV_NUM_WORDS
;
149 data_ptr
= kmalloc_array(max_if_num
,
150 BATADV_NUM_WORDS
* sizeof(unsigned long),
155 memcpy(data_ptr
, orig_node
->bat_iv
.bcast_own
, old_size
);
156 kfree(orig_node
->bat_iv
.bcast_own
);
157 orig_node
->bat_iv
.bcast_own
= data_ptr
;
159 data_ptr
= kmalloc_array(max_if_num
, sizeof(u8
), GFP_ATOMIC
);
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_drop_bcast_own_entry - drop section of bcast_own
178 * @orig_node: the orig_node that has to be changed
179 * @max_if_num: the current amount of interfaces
180 * @del_if_num: the index of the interface being removed
183 batadv_iv_ogm_drop_bcast_own_entry(struct batadv_orig_node
*orig_node
,
184 int max_if_num
, int del_if_num
)
190 lockdep_assert_held(&orig_node
->bat_iv
.ogm_cnt_lock
);
192 chunk_size
= sizeof(unsigned long) * BATADV_NUM_WORDS
;
193 data_ptr
= kmalloc_array(max_if_num
, chunk_size
, GFP_ATOMIC
);
195 /* use old buffer when new one could not be allocated */
196 data_ptr
= orig_node
->bat_iv
.bcast_own
;
198 /* copy first part */
199 memmove(data_ptr
, orig_node
->bat_iv
.bcast_own
, del_if_num
* chunk_size
);
201 /* copy second part */
202 if_offset
= (del_if_num
+ 1) * chunk_size
;
203 memmove((char *)data_ptr
+ del_if_num
* chunk_size
,
204 (uint8_t *)orig_node
->bat_iv
.bcast_own
+ if_offset
,
205 (max_if_num
- del_if_num
) * chunk_size
);
207 /* bcast_own was shrunk down in new buffer; free old one */
208 if (orig_node
->bat_iv
.bcast_own
!= data_ptr
) {
209 kfree(orig_node
->bat_iv
.bcast_own
);
210 orig_node
->bat_iv
.bcast_own
= data_ptr
;
215 * batadv_iv_ogm_drop_bcast_own_sum_entry - drop section of bcast_own_sum
216 * @orig_node: the orig_node that has to be changed
217 * @max_if_num: the current amount of interfaces
218 * @del_if_num: the index of the interface being removed
221 batadv_iv_ogm_drop_bcast_own_sum_entry(struct batadv_orig_node
*orig_node
,
222 int max_if_num
, int del_if_num
)
227 lockdep_assert_held(&orig_node
->bat_iv
.ogm_cnt_lock
);
229 data_ptr
= kmalloc_array(max_if_num
, sizeof(u8
), GFP_ATOMIC
);
231 /* use old buffer when new one could not be allocated */
232 data_ptr
= orig_node
->bat_iv
.bcast_own_sum
;
234 memmove(data_ptr
, orig_node
->bat_iv
.bcast_own_sum
,
235 del_if_num
* sizeof(u8
));
237 if_offset
= (del_if_num
+ 1) * sizeof(u8
);
238 memmove((char *)data_ptr
+ del_if_num
* sizeof(u8
),
239 orig_node
->bat_iv
.bcast_own_sum
+ if_offset
,
240 (max_if_num
- del_if_num
) * sizeof(u8
));
242 /* bcast_own_sum was shrunk down in new buffer; free old one */
243 if (orig_node
->bat_iv
.bcast_own_sum
!= data_ptr
) {
244 kfree(orig_node
->bat_iv
.bcast_own_sum
);
245 orig_node
->bat_iv
.bcast_own_sum
= data_ptr
;
250 * batadv_iv_ogm_orig_del_if - change the private structures of the orig_node to
251 * exclude the removed interface
252 * @orig_node: the orig_node that has to be changed
253 * @max_if_num: the current amount of interfaces
254 * @del_if_num: the index of the interface being removed
256 * Return: 0 on success, a negative error code otherwise.
258 static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node
*orig_node
,
259 int max_if_num
, int del_if_num
)
261 spin_lock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
263 if (max_if_num
== 0) {
264 kfree(orig_node
->bat_iv
.bcast_own
);
265 kfree(orig_node
->bat_iv
.bcast_own_sum
);
266 orig_node
->bat_iv
.bcast_own
= NULL
;
267 orig_node
->bat_iv
.bcast_own_sum
= NULL
;
269 batadv_iv_ogm_drop_bcast_own_entry(orig_node
, max_if_num
,
271 batadv_iv_ogm_drop_bcast_own_sum_entry(orig_node
, max_if_num
,
275 spin_unlock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
281 * batadv_iv_ogm_orig_get - retrieve or create (if does not exist) an originator
282 * @bat_priv: the bat priv with all the soft interface information
283 * @addr: mac address of the originator
285 * Return: the originator object corresponding to the passed mac address or NULL
287 * If the object does not exists it is created an initialised.
289 static struct batadv_orig_node
*
290 batadv_iv_ogm_orig_get(struct batadv_priv
*bat_priv
, const u8
*addr
)
292 struct batadv_orig_node
*orig_node
;
293 int size
, hash_added
;
295 orig_node
= batadv_orig_hash_find(bat_priv
, addr
);
299 orig_node
= batadv_orig_node_new(bat_priv
, addr
);
303 spin_lock_init(&orig_node
->bat_iv
.ogm_cnt_lock
);
305 size
= bat_priv
->num_ifaces
* sizeof(unsigned long) * BATADV_NUM_WORDS
;
306 orig_node
->bat_iv
.bcast_own
= kzalloc(size
, GFP_ATOMIC
);
307 if (!orig_node
->bat_iv
.bcast_own
)
310 size
= bat_priv
->num_ifaces
* sizeof(u8
);
311 orig_node
->bat_iv
.bcast_own_sum
= kzalloc(size
, GFP_ATOMIC
);
312 if (!orig_node
->bat_iv
.bcast_own_sum
)
315 hash_added
= batadv_hash_add(bat_priv
->orig_hash
, batadv_compare_orig
,
316 batadv_choose_orig
, orig_node
,
317 &orig_node
->hash_entry
);
324 /* free twice, as batadv_orig_node_new sets refcount to 2 */
325 batadv_orig_node_put(orig_node
);
326 batadv_orig_node_put(orig_node
);
331 static struct batadv_neigh_node
*
332 batadv_iv_ogm_neigh_new(struct batadv_hard_iface
*hard_iface
,
333 const u8
*neigh_addr
,
334 struct batadv_orig_node
*orig_node
,
335 struct batadv_orig_node
*orig_neigh
)
337 struct batadv_neigh_node
*neigh_node
;
339 neigh_node
= batadv_neigh_node_new(orig_node
, hard_iface
, neigh_addr
);
343 neigh_node
->orig_node
= orig_neigh
;
349 static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface
*hard_iface
)
351 struct batadv_ogm_packet
*batadv_ogm_packet
;
352 unsigned char *ogm_buff
;
355 /* randomize initial seqno to avoid collision */
356 get_random_bytes(&random_seqno
, sizeof(random_seqno
));
357 atomic_set(&hard_iface
->bat_iv
.ogm_seqno
, random_seqno
);
359 hard_iface
->bat_iv
.ogm_buff_len
= BATADV_OGM_HLEN
;
360 ogm_buff
= kmalloc(hard_iface
->bat_iv
.ogm_buff_len
, GFP_ATOMIC
);
364 hard_iface
->bat_iv
.ogm_buff
= ogm_buff
;
366 batadv_ogm_packet
= (struct batadv_ogm_packet
*)ogm_buff
;
367 batadv_ogm_packet
->packet_type
= BATADV_IV_OGM
;
368 batadv_ogm_packet
->version
= BATADV_COMPAT_VERSION
;
369 batadv_ogm_packet
->ttl
= 2;
370 batadv_ogm_packet
->flags
= BATADV_NO_FLAGS
;
371 batadv_ogm_packet
->reserved
= 0;
372 batadv_ogm_packet
->tq
= BATADV_TQ_MAX_VALUE
;
377 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface
*hard_iface
)
379 kfree(hard_iface
->bat_iv
.ogm_buff
);
380 hard_iface
->bat_iv
.ogm_buff
= NULL
;
383 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface
*hard_iface
)
385 struct batadv_ogm_packet
*batadv_ogm_packet
;
386 unsigned char *ogm_buff
= hard_iface
->bat_iv
.ogm_buff
;
388 batadv_ogm_packet
= (struct batadv_ogm_packet
*)ogm_buff
;
389 ether_addr_copy(batadv_ogm_packet
->orig
,
390 hard_iface
->net_dev
->dev_addr
);
391 ether_addr_copy(batadv_ogm_packet
->prev_sender
,
392 hard_iface
->net_dev
->dev_addr
);
396 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface
*hard_iface
)
398 struct batadv_ogm_packet
*batadv_ogm_packet
;
399 unsigned char *ogm_buff
= hard_iface
->bat_iv
.ogm_buff
;
401 batadv_ogm_packet
= (struct batadv_ogm_packet
*)ogm_buff
;
402 batadv_ogm_packet
->ttl
= BATADV_TTL
;
405 /* when do we schedule our own ogm to be sent */
407 batadv_iv_ogm_emit_send_time(const struct batadv_priv
*bat_priv
)
411 msecs
= atomic_read(&bat_priv
->orig_interval
) - BATADV_JITTER
;
412 msecs
+= prandom_u32() % (2 * BATADV_JITTER
);
414 return jiffies
+ msecs_to_jiffies(msecs
);
417 /* when do we schedule a ogm packet to be sent */
418 static unsigned long batadv_iv_ogm_fwd_send_time(void)
420 return jiffies
+ msecs_to_jiffies(prandom_u32() % (BATADV_JITTER
/ 2));
423 /* apply hop penalty for a normal link */
424 static u8
batadv_hop_penalty(u8 tq
, const struct batadv_priv
*bat_priv
)
426 int hop_penalty
= atomic_read(&bat_priv
->hop_penalty
);
429 new_tq
= tq
* (BATADV_TQ_MAX_VALUE
- hop_penalty
);
430 new_tq
/= BATADV_TQ_MAX_VALUE
;
436 * batadv_iv_ogm_aggr_packet - checks if there is another OGM attached
437 * @buff_pos: current position in the skb
438 * @packet_len: total length of the skb
439 * @tvlv_len: tvlv length of the previously considered OGM
441 * Return: true if there is enough space for another OGM, false otherwise.
443 static bool batadv_iv_ogm_aggr_packet(int buff_pos
, int packet_len
,
446 int next_buff_pos
= 0;
448 next_buff_pos
+= buff_pos
+ BATADV_OGM_HLEN
;
449 next_buff_pos
+= ntohs(tvlv_len
);
451 return (next_buff_pos
<= packet_len
) &&
452 (next_buff_pos
<= BATADV_MAX_AGGREGATION_BYTES
);
455 /* send a batman ogm to a given interface */
456 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet
*forw_packet
,
457 struct batadv_hard_iface
*hard_iface
)
459 struct batadv_priv
*bat_priv
= netdev_priv(hard_iface
->soft_iface
);
463 struct batadv_ogm_packet
*batadv_ogm_packet
;
467 if (hard_iface
->if_status
!= BATADV_IF_ACTIVE
)
472 packet_pos
= forw_packet
->skb
->data
;
473 batadv_ogm_packet
= (struct batadv_ogm_packet
*)packet_pos
;
475 /* adjust all flags and log packets */
476 while (batadv_iv_ogm_aggr_packet(buff_pos
, forw_packet
->packet_len
,
477 batadv_ogm_packet
->tvlv_len
)) {
478 /* we might have aggregated direct link packets with an
479 * ordinary base packet
481 if (forw_packet
->direct_link_flags
& BIT(packet_num
) &&
482 forw_packet
->if_incoming
== hard_iface
)
483 batadv_ogm_packet
->flags
|= BATADV_DIRECTLINK
;
485 batadv_ogm_packet
->flags
&= ~BATADV_DIRECTLINK
;
487 if (packet_num
> 0 || !forw_packet
->own
)
488 fwd_str
= "Forwarding";
490 fwd_str
= "Sending own";
492 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
493 "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n",
494 fwd_str
, (packet_num
> 0 ? "aggregated " : ""),
495 batadv_ogm_packet
->orig
,
496 ntohl(batadv_ogm_packet
->seqno
),
497 batadv_ogm_packet
->tq
, batadv_ogm_packet
->ttl
,
498 ((batadv_ogm_packet
->flags
& BATADV_DIRECTLINK
) ?
500 hard_iface
->net_dev
->name
,
501 hard_iface
->net_dev
->dev_addr
);
503 buff_pos
+= BATADV_OGM_HLEN
;
504 buff_pos
+= ntohs(batadv_ogm_packet
->tvlv_len
);
506 packet_pos
= forw_packet
->skb
->data
+ buff_pos
;
507 batadv_ogm_packet
= (struct batadv_ogm_packet
*)packet_pos
;
510 /* create clone because function is called more than once */
511 skb
= skb_clone(forw_packet
->skb
, GFP_ATOMIC
);
513 batadv_inc_counter(bat_priv
, BATADV_CNT_MGMT_TX
);
514 batadv_add_counter(bat_priv
, BATADV_CNT_MGMT_TX_BYTES
,
515 skb
->len
+ ETH_HLEN
);
516 batadv_send_broadcast_skb(skb
, hard_iface
);
520 /* send a batman ogm packet */
521 static void batadv_iv_ogm_emit(struct batadv_forw_packet
*forw_packet
)
523 struct net_device
*soft_iface
;
524 struct batadv_priv
*bat_priv
;
525 struct batadv_hard_iface
*primary_if
= NULL
;
527 if (!forw_packet
->if_incoming
) {
528 pr_err("Error - can't forward packet: incoming iface not specified\n");
532 soft_iface
= forw_packet
->if_incoming
->soft_iface
;
533 bat_priv
= netdev_priv(soft_iface
);
535 if (WARN_ON(!forw_packet
->if_outgoing
))
538 if (WARN_ON(forw_packet
->if_outgoing
->soft_iface
!= soft_iface
))
541 if (forw_packet
->if_incoming
->if_status
!= BATADV_IF_ACTIVE
)
544 primary_if
= batadv_primary_if_get_selected(bat_priv
);
548 /* only for one specific outgoing interface */
549 batadv_iv_ogm_send_to_if(forw_packet
, forw_packet
->if_outgoing
);
553 batadv_hardif_put(primary_if
);
557 * batadv_iv_ogm_can_aggregate - find out if an OGM can be aggregated on an
558 * existing forward packet
559 * @new_bat_ogm_packet: OGM packet to be aggregated
560 * @bat_priv: the bat priv with all the soft interface information
561 * @packet_len: (total) length of the OGM
562 * @send_time: timestamp (jiffies) when the packet is to be sent
563 * @directlink: true if this is a direct link packet
564 * @if_incoming: interface where the packet was received
565 * @if_outgoing: interface for which the retransmission should be considered
566 * @forw_packet: the forwarded packet which should be checked
568 * Return: true if new_packet can be aggregated with forw_packet
571 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet
*new_bat_ogm_packet
,
572 struct batadv_priv
*bat_priv
,
573 int packet_len
, unsigned long send_time
,
575 const struct batadv_hard_iface
*if_incoming
,
576 const struct batadv_hard_iface
*if_outgoing
,
577 const struct batadv_forw_packet
*forw_packet
)
579 struct batadv_ogm_packet
*batadv_ogm_packet
;
580 int aggregated_bytes
= forw_packet
->packet_len
+ packet_len
;
581 struct batadv_hard_iface
*primary_if
= NULL
;
583 unsigned long aggregation_end_time
;
585 batadv_ogm_packet
= (struct batadv_ogm_packet
*)forw_packet
->skb
->data
;
586 aggregation_end_time
= send_time
;
587 aggregation_end_time
+= msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS
);
589 /* we can aggregate the current packet to this aggregated packet
592 * - the send time is within our MAX_AGGREGATION_MS time
593 * - the resulting packet wont be bigger than
594 * MAX_AGGREGATION_BYTES
595 * otherwise aggregation is not possible
597 if (!time_before(send_time
, forw_packet
->send_time
) ||
598 !time_after_eq(aggregation_end_time
, forw_packet
->send_time
))
601 if (aggregated_bytes
> BATADV_MAX_AGGREGATION_BYTES
)
604 /* packet is not leaving on the same interface. */
605 if (forw_packet
->if_outgoing
!= if_outgoing
)
608 /* check aggregation compatibility
609 * -> direct link packets are broadcasted on
610 * their interface only
611 * -> aggregate packet if the current packet is
612 * a "global" packet as well as the base
615 primary_if
= batadv_primary_if_get_selected(bat_priv
);
619 /* packets without direct link flag and high TTL
620 * are flooded through the net
623 !(batadv_ogm_packet
->flags
& BATADV_DIRECTLINK
) &&
624 batadv_ogm_packet
->ttl
!= 1 &&
626 /* own packets originating non-primary
627 * interfaces leave only that interface
629 (!forw_packet
->own
||
630 forw_packet
->if_incoming
== primary_if
)) {
635 /* if the incoming packet is sent via this one
636 * interface only - we still can aggregate
639 new_bat_ogm_packet
->ttl
== 1 &&
640 forw_packet
->if_incoming
== if_incoming
&&
642 /* packets from direct neighbors or
643 * own secondary interface packets
644 * (= secondary interface packets in general)
646 (batadv_ogm_packet
->flags
& BATADV_DIRECTLINK
||
648 forw_packet
->if_incoming
!= primary_if
))) {
655 batadv_hardif_put(primary_if
);
660 * batadv_iv_ogm_aggregate_new - create a new aggregated packet and add this
662 * @packet_buff: pointer to the OGM
663 * @packet_len: (total) length of the OGM
664 * @send_time: timestamp (jiffies) when the packet is to be sent
665 * @direct_link: whether this OGM has direct link status
666 * @if_incoming: interface where the packet was received
667 * @if_outgoing: interface for which the retransmission should be considered
668 * @own_packet: true if it is a self-generated ogm
670 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff
,
671 int packet_len
, unsigned long send_time
,
673 struct batadv_hard_iface
*if_incoming
,
674 struct batadv_hard_iface
*if_outgoing
,
677 struct batadv_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
678 struct batadv_forw_packet
*forw_packet_aggr
;
679 unsigned char *skb_buff
;
680 unsigned int skb_size
;
682 /* own packet should always be scheduled */
684 if (!batadv_atomic_dec_not_zero(&bat_priv
->batman_queue_left
)) {
685 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
686 "batman packet queue full\n");
691 forw_packet_aggr
= kmalloc(sizeof(*forw_packet_aggr
), GFP_ATOMIC
);
692 if (!forw_packet_aggr
)
695 if (atomic_read(&bat_priv
->aggregated_ogms
) &&
696 packet_len
< BATADV_MAX_AGGREGATION_BYTES
)
697 skb_size
= BATADV_MAX_AGGREGATION_BYTES
;
699 skb_size
= packet_len
;
701 skb_size
+= ETH_HLEN
;
703 forw_packet_aggr
->skb
= netdev_alloc_skb_ip_align(NULL
, skb_size
);
704 if (!forw_packet_aggr
->skb
)
705 goto out_free_forw_packet
;
706 forw_packet_aggr
->skb
->priority
= TC_PRIO_CONTROL
;
707 skb_reserve(forw_packet_aggr
->skb
, ETH_HLEN
);
709 skb_buff
= skb_put(forw_packet_aggr
->skb
, packet_len
);
710 forw_packet_aggr
->packet_len
= packet_len
;
711 memcpy(skb_buff
, packet_buff
, packet_len
);
713 kref_get(&if_incoming
->refcount
);
714 kref_get(&if_outgoing
->refcount
);
715 forw_packet_aggr
->own
= own_packet
;
716 forw_packet_aggr
->if_incoming
= if_incoming
;
717 forw_packet_aggr
->if_outgoing
= if_outgoing
;
718 forw_packet_aggr
->num_packets
= 0;
719 forw_packet_aggr
->direct_link_flags
= BATADV_NO_FLAGS
;
720 forw_packet_aggr
->send_time
= send_time
;
722 /* save packet direct link flag status */
724 forw_packet_aggr
->direct_link_flags
|= 1;
726 /* add new packet to packet list */
727 spin_lock_bh(&bat_priv
->forw_bat_list_lock
);
728 hlist_add_head(&forw_packet_aggr
->list
, &bat_priv
->forw_bat_list
);
729 spin_unlock_bh(&bat_priv
->forw_bat_list_lock
);
731 /* start timer for this packet */
732 INIT_DELAYED_WORK(&forw_packet_aggr
->delayed_work
,
733 batadv_send_outstanding_bat_ogm_packet
);
734 queue_delayed_work(batadv_event_workqueue
,
735 &forw_packet_aggr
->delayed_work
,
736 send_time
- jiffies
);
739 out_free_forw_packet
:
740 kfree(forw_packet_aggr
);
743 atomic_inc(&bat_priv
->batman_queue_left
);
746 /* aggregate a new packet into the existing ogm packet */
747 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet
*forw_packet_aggr
,
748 const unsigned char *packet_buff
,
749 int packet_len
, bool direct_link
)
751 unsigned char *skb_buff
;
752 unsigned long new_direct_link_flag
;
754 skb_buff
= skb_put(forw_packet_aggr
->skb
, packet_len
);
755 memcpy(skb_buff
, packet_buff
, packet_len
);
756 forw_packet_aggr
->packet_len
+= packet_len
;
757 forw_packet_aggr
->num_packets
++;
759 /* save packet direct link flag status */
761 new_direct_link_flag
= BIT(forw_packet_aggr
->num_packets
);
762 forw_packet_aggr
->direct_link_flags
|= new_direct_link_flag
;
767 * batadv_iv_ogm_queue_add - queue up an OGM for transmission
768 * @bat_priv: the bat priv with all the soft interface information
769 * @packet_buff: pointer to the OGM
770 * @packet_len: (total) length of the OGM
771 * @if_incoming: interface where the packet was received
772 * @if_outgoing: interface for which the retransmission should be considered
773 * @own_packet: true if it is a self-generated ogm
774 * @send_time: timestamp (jiffies) when the packet is to be sent
776 static void batadv_iv_ogm_queue_add(struct batadv_priv
*bat_priv
,
777 unsigned char *packet_buff
,
779 struct batadv_hard_iface
*if_incoming
,
780 struct batadv_hard_iface
*if_outgoing
,
781 int own_packet
, unsigned long send_time
)
783 /* _aggr -> pointer to the packet we want to aggregate with
784 * _pos -> pointer to the position in the queue
786 struct batadv_forw_packet
*forw_packet_aggr
= NULL
;
787 struct batadv_forw_packet
*forw_packet_pos
= NULL
;
788 struct batadv_ogm_packet
*batadv_ogm_packet
;
790 unsigned long max_aggregation_jiffies
;
792 batadv_ogm_packet
= (struct batadv_ogm_packet
*)packet_buff
;
793 direct_link
= !!(batadv_ogm_packet
->flags
& BATADV_DIRECTLINK
);
794 max_aggregation_jiffies
= msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS
);
796 /* find position for the packet in the forward queue */
797 spin_lock_bh(&bat_priv
->forw_bat_list_lock
);
798 /* own packets are not to be aggregated */
799 if (atomic_read(&bat_priv
->aggregated_ogms
) && !own_packet
) {
800 hlist_for_each_entry(forw_packet_pos
,
801 &bat_priv
->forw_bat_list
, list
) {
802 if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet
,
803 bat_priv
, packet_len
,
804 send_time
, direct_link
,
808 forw_packet_aggr
= forw_packet_pos
;
814 /* nothing to aggregate with - either aggregation disabled or no
815 * suitable aggregation packet found
817 if (!forw_packet_aggr
) {
818 /* the following section can run without the lock */
819 spin_unlock_bh(&bat_priv
->forw_bat_list_lock
);
821 /* if we could not aggregate this packet with one of the others
822 * we hold it back for a while, so that it might be aggregated
825 if (!own_packet
&& atomic_read(&bat_priv
->aggregated_ogms
))
826 send_time
+= max_aggregation_jiffies
;
828 batadv_iv_ogm_aggregate_new(packet_buff
, packet_len
,
829 send_time
, direct_link
,
830 if_incoming
, if_outgoing
,
833 batadv_iv_ogm_aggregate(forw_packet_aggr
, packet_buff
,
834 packet_len
, direct_link
);
835 spin_unlock_bh(&bat_priv
->forw_bat_list_lock
);
839 static void batadv_iv_ogm_forward(struct batadv_orig_node
*orig_node
,
840 const struct ethhdr
*ethhdr
,
841 struct batadv_ogm_packet
*batadv_ogm_packet
,
842 bool is_single_hop_neigh
,
843 bool is_from_best_next_hop
,
844 struct batadv_hard_iface
*if_incoming
,
845 struct batadv_hard_iface
*if_outgoing
)
847 struct batadv_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
850 if (batadv_ogm_packet
->ttl
<= 1) {
851 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
, "ttl exceeded\n");
855 if (!is_from_best_next_hop
) {
856 /* Mark the forwarded packet when it is not coming from our
857 * best next hop. We still need to forward the packet for our
858 * neighbor link quality detection to work in case the packet
859 * originated from a single hop neighbor. Otherwise we can
860 * simply drop the ogm.
862 if (is_single_hop_neigh
)
863 batadv_ogm_packet
->flags
|= BATADV_NOT_BEST_NEXT_HOP
;
868 tvlv_len
= ntohs(batadv_ogm_packet
->tvlv_len
);
870 batadv_ogm_packet
->ttl
--;
871 ether_addr_copy(batadv_ogm_packet
->prev_sender
, ethhdr
->h_source
);
873 /* apply hop penalty */
874 batadv_ogm_packet
->tq
= batadv_hop_penalty(batadv_ogm_packet
->tq
,
877 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
878 "Forwarding packet: tq: %i, ttl: %i\n",
879 batadv_ogm_packet
->tq
, batadv_ogm_packet
->ttl
);
881 if (is_single_hop_neigh
)
882 batadv_ogm_packet
->flags
|= BATADV_DIRECTLINK
;
884 batadv_ogm_packet
->flags
&= ~BATADV_DIRECTLINK
;
886 batadv_iv_ogm_queue_add(bat_priv
, (unsigned char *)batadv_ogm_packet
,
887 BATADV_OGM_HLEN
+ tvlv_len
,
888 if_incoming
, if_outgoing
, 0,
889 batadv_iv_ogm_fwd_send_time());
893 * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for
894 * the given interface
895 * @hard_iface: the interface for which the windows have to be shifted
898 batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface
*hard_iface
)
900 struct batadv_priv
*bat_priv
= netdev_priv(hard_iface
->soft_iface
);
901 struct batadv_hashtable
*hash
= bat_priv
->orig_hash
;
902 struct hlist_head
*head
;
903 struct batadv_orig_node
*orig_node
;
910 for (i
= 0; i
< hash
->size
; i
++) {
911 head
= &hash
->table
[i
];
914 hlist_for_each_entry_rcu(orig_node
, head
, hash_entry
) {
915 spin_lock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
916 word_index
= hard_iface
->if_num
* BATADV_NUM_WORDS
;
917 word
= &orig_node
->bat_iv
.bcast_own
[word_index
];
919 batadv_bit_get_packet(bat_priv
, word
, 1, 0);
920 if_num
= hard_iface
->if_num
;
921 w
= &orig_node
->bat_iv
.bcast_own_sum
[if_num
];
922 *w
= bitmap_weight(word
, BATADV_TQ_LOCAL_WINDOW_SIZE
);
923 spin_unlock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
929 static void batadv_iv_ogm_schedule(struct batadv_hard_iface
*hard_iface
)
931 struct batadv_priv
*bat_priv
= netdev_priv(hard_iface
->soft_iface
);
932 unsigned char **ogm_buff
= &hard_iface
->bat_iv
.ogm_buff
;
933 struct batadv_ogm_packet
*batadv_ogm_packet
;
934 struct batadv_hard_iface
*primary_if
, *tmp_hard_iface
;
935 int *ogm_buff_len
= &hard_iface
->bat_iv
.ogm_buff_len
;
938 unsigned long send_time
;
940 primary_if
= batadv_primary_if_get_selected(bat_priv
);
942 if (hard_iface
== primary_if
) {
943 /* tt changes have to be committed before the tvlv data is
944 * appended as it may alter the tt tvlv container
946 batadv_tt_local_commit_changes(bat_priv
);
947 tvlv_len
= batadv_tvlv_container_ogm_append(bat_priv
, ogm_buff
,
952 batadv_ogm_packet
= (struct batadv_ogm_packet
*)(*ogm_buff
);
953 batadv_ogm_packet
->tvlv_len
= htons(tvlv_len
);
955 /* change sequence number to network order */
956 seqno
= (u32
)atomic_read(&hard_iface
->bat_iv
.ogm_seqno
);
957 batadv_ogm_packet
->seqno
= htonl(seqno
);
958 atomic_inc(&hard_iface
->bat_iv
.ogm_seqno
);
960 batadv_iv_ogm_slide_own_bcast_window(hard_iface
);
962 send_time
= batadv_iv_ogm_emit_send_time(bat_priv
);
964 if (hard_iface
!= primary_if
) {
965 /* OGMs from secondary interfaces are only scheduled on their
966 * respective interfaces.
968 batadv_iv_ogm_queue_add(bat_priv
, *ogm_buff
, *ogm_buff_len
,
969 hard_iface
, hard_iface
, 1, send_time
);
973 /* OGMs from primary interfaces are scheduled on all
977 list_for_each_entry_rcu(tmp_hard_iface
, &batadv_hardif_list
, list
) {
978 if (tmp_hard_iface
->soft_iface
!= hard_iface
->soft_iface
)
981 if (!kref_get_unless_zero(&tmp_hard_iface
->refcount
))
984 batadv_iv_ogm_queue_add(bat_priv
, *ogm_buff
,
985 *ogm_buff_len
, hard_iface
,
986 tmp_hard_iface
, 1, send_time
);
988 batadv_hardif_put(tmp_hard_iface
);
994 batadv_hardif_put(primary_if
);
998 * batadv_iv_ogm_orig_update - use OGM to update corresponding data in an
1000 * @bat_priv: the bat priv with all the soft interface information
1001 * @orig_node: the orig node who originally emitted the ogm packet
1002 * @orig_ifinfo: ifinfo for the outgoing interface of the orig_node
1003 * @ethhdr: Ethernet header of the OGM
1004 * @batadv_ogm_packet: the ogm packet
1005 * @if_incoming: interface where the packet was received
1006 * @if_outgoing: interface for which the retransmission should be considered
1007 * @dup_status: the duplicate status of this ogm packet.
1010 batadv_iv_ogm_orig_update(struct batadv_priv
*bat_priv
,
1011 struct batadv_orig_node
*orig_node
,
1012 struct batadv_orig_ifinfo
*orig_ifinfo
,
1013 const struct ethhdr
*ethhdr
,
1014 const struct batadv_ogm_packet
*batadv_ogm_packet
,
1015 struct batadv_hard_iface
*if_incoming
,
1016 struct batadv_hard_iface
*if_outgoing
,
1017 enum batadv_dup_status dup_status
)
1019 struct batadv_neigh_ifinfo
*neigh_ifinfo
= NULL
;
1020 struct batadv_neigh_ifinfo
*router_ifinfo
= NULL
;
1021 struct batadv_neigh_node
*neigh_node
= NULL
;
1022 struct batadv_neigh_node
*tmp_neigh_node
= NULL
;
1023 struct batadv_neigh_node
*router
= NULL
;
1024 struct batadv_orig_node
*orig_node_tmp
;
1026 u8 sum_orig
, sum_neigh
;
1030 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1031 "update_originator(): Searching and updating originator entry of received packet\n");
1034 hlist_for_each_entry_rcu(tmp_neigh_node
,
1035 &orig_node
->neigh_list
, list
) {
1036 neigh_addr
= tmp_neigh_node
->addr
;
1037 if (batadv_compare_eth(neigh_addr
, ethhdr
->h_source
) &&
1038 tmp_neigh_node
->if_incoming
== if_incoming
&&
1039 kref_get_unless_zero(&tmp_neigh_node
->refcount
)) {
1040 if (WARN(neigh_node
, "too many matching neigh_nodes"))
1041 batadv_neigh_node_put(neigh_node
);
1042 neigh_node
= tmp_neigh_node
;
1046 if (dup_status
!= BATADV_NO_DUP
)
1049 /* only update the entry for this outgoing interface */
1050 neigh_ifinfo
= batadv_neigh_ifinfo_get(tmp_neigh_node
,
1055 spin_lock_bh(&tmp_neigh_node
->ifinfo_lock
);
1056 batadv_ring_buffer_set(neigh_ifinfo
->bat_iv
.tq_recv
,
1057 &neigh_ifinfo
->bat_iv
.tq_index
, 0);
1058 tq_avg
= batadv_ring_buffer_avg(neigh_ifinfo
->bat_iv
.tq_recv
);
1059 neigh_ifinfo
->bat_iv
.tq_avg
= tq_avg
;
1060 spin_unlock_bh(&tmp_neigh_node
->ifinfo_lock
);
1062 batadv_neigh_ifinfo_put(neigh_ifinfo
);
1063 neigh_ifinfo
= NULL
;
1067 struct batadv_orig_node
*orig_tmp
;
1069 orig_tmp
= batadv_iv_ogm_orig_get(bat_priv
, ethhdr
->h_source
);
1073 neigh_node
= batadv_iv_ogm_neigh_new(if_incoming
,
1075 orig_node
, orig_tmp
);
1077 batadv_orig_node_put(orig_tmp
);
1081 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1082 "Updating existing last-hop neighbor of originator\n");
1086 neigh_ifinfo
= batadv_neigh_ifinfo_new(neigh_node
, if_outgoing
);
1090 neigh_node
->last_seen
= jiffies
;
1092 spin_lock_bh(&neigh_node
->ifinfo_lock
);
1093 batadv_ring_buffer_set(neigh_ifinfo
->bat_iv
.tq_recv
,
1094 &neigh_ifinfo
->bat_iv
.tq_index
,
1095 batadv_ogm_packet
->tq
);
1096 tq_avg
= batadv_ring_buffer_avg(neigh_ifinfo
->bat_iv
.tq_recv
);
1097 neigh_ifinfo
->bat_iv
.tq_avg
= tq_avg
;
1098 spin_unlock_bh(&neigh_node
->ifinfo_lock
);
1100 if (dup_status
== BATADV_NO_DUP
) {
1101 orig_ifinfo
->last_ttl
= batadv_ogm_packet
->ttl
;
1102 neigh_ifinfo
->last_ttl
= batadv_ogm_packet
->ttl
;
1105 /* if this neighbor already is our next hop there is nothing
1108 router
= batadv_orig_router_get(orig_node
, if_outgoing
);
1109 if (router
== neigh_node
)
1113 router_ifinfo
= batadv_neigh_ifinfo_get(router
, if_outgoing
);
1117 /* if this neighbor does not offer a better TQ we won't
1120 if (router_ifinfo
->bat_iv
.tq_avg
> neigh_ifinfo
->bat_iv
.tq_avg
)
1124 /* if the TQ is the same and the link not more symmetric we
1125 * won't consider it either
1127 if (router_ifinfo
&&
1128 neigh_ifinfo
->bat_iv
.tq_avg
== router_ifinfo
->bat_iv
.tq_avg
) {
1129 orig_node_tmp
= router
->orig_node
;
1130 spin_lock_bh(&orig_node_tmp
->bat_iv
.ogm_cnt_lock
);
1131 if_num
= router
->if_incoming
->if_num
;
1132 sum_orig
= orig_node_tmp
->bat_iv
.bcast_own_sum
[if_num
];
1133 spin_unlock_bh(&orig_node_tmp
->bat_iv
.ogm_cnt_lock
);
1135 orig_node_tmp
= neigh_node
->orig_node
;
1136 spin_lock_bh(&orig_node_tmp
->bat_iv
.ogm_cnt_lock
);
1137 if_num
= neigh_node
->if_incoming
->if_num
;
1138 sum_neigh
= orig_node_tmp
->bat_iv
.bcast_own_sum
[if_num
];
1139 spin_unlock_bh(&orig_node_tmp
->bat_iv
.ogm_cnt_lock
);
1141 if (sum_orig
>= sum_neigh
)
1145 batadv_update_route(bat_priv
, orig_node
, if_outgoing
, neigh_node
);
1152 batadv_neigh_node_put(neigh_node
);
1154 batadv_neigh_node_put(router
);
1156 batadv_neigh_ifinfo_put(neigh_ifinfo
);
1158 batadv_neigh_ifinfo_put(router_ifinfo
);
1162 * batadv_iv_ogm_calc_tq - calculate tq for current received ogm packet
1163 * @orig_node: the orig node who originally emitted the ogm packet
1164 * @orig_neigh_node: the orig node struct of the neighbor who sent the packet
1165 * @batadv_ogm_packet: the ogm packet
1166 * @if_incoming: interface where the packet was received
1167 * @if_outgoing: interface for which the retransmission should be considered
1169 * Return: true if the link can be considered bidirectional, false otherwise
1171 static bool batadv_iv_ogm_calc_tq(struct batadv_orig_node
*orig_node
,
1172 struct batadv_orig_node
*orig_neigh_node
,
1173 struct batadv_ogm_packet
*batadv_ogm_packet
,
1174 struct batadv_hard_iface
*if_incoming
,
1175 struct batadv_hard_iface
*if_outgoing
)
1177 struct batadv_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
1178 struct batadv_neigh_node
*neigh_node
= NULL
, *tmp_neigh_node
;
1179 struct batadv_neigh_ifinfo
*neigh_ifinfo
;
1181 u8 orig_eq_count
, neigh_rq_count
, neigh_rq_inv
, tq_own
;
1182 unsigned int neigh_rq_inv_cube
, neigh_rq_max_cube
;
1184 unsigned int tq_asym_penalty
, inv_asym_penalty
;
1185 unsigned int combined_tq
;
1186 unsigned int tq_iface_penalty
;
1189 /* find corresponding one hop neighbor */
1191 hlist_for_each_entry_rcu(tmp_neigh_node
,
1192 &orig_neigh_node
->neigh_list
, list
) {
1193 if (!batadv_compare_eth(tmp_neigh_node
->addr
,
1194 orig_neigh_node
->orig
))
1197 if (tmp_neigh_node
->if_incoming
!= if_incoming
)
1200 if (!kref_get_unless_zero(&tmp_neigh_node
->refcount
))
1203 neigh_node
= tmp_neigh_node
;
1209 neigh_node
= batadv_iv_ogm_neigh_new(if_incoming
,
1210 orig_neigh_node
->orig
,
1217 /* if orig_node is direct neighbor update neigh_node last_seen */
1218 if (orig_node
== orig_neigh_node
)
1219 neigh_node
->last_seen
= jiffies
;
1221 orig_node
->last_seen
= jiffies
;
1223 /* find packet count of corresponding one hop neighbor */
1224 spin_lock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
1225 if_num
= if_incoming
->if_num
;
1226 orig_eq_count
= orig_neigh_node
->bat_iv
.bcast_own_sum
[if_num
];
1227 neigh_ifinfo
= batadv_neigh_ifinfo_new(neigh_node
, if_outgoing
);
1229 neigh_rq_count
= neigh_ifinfo
->bat_iv
.real_packet_count
;
1230 batadv_neigh_ifinfo_put(neigh_ifinfo
);
1234 spin_unlock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
1236 /* pay attention to not get a value bigger than 100 % */
1237 if (orig_eq_count
> neigh_rq_count
)
1238 total_count
= neigh_rq_count
;
1240 total_count
= orig_eq_count
;
1242 /* if we have too few packets (too less data) we set tq_own to zero
1243 * if we receive too few packets it is not considered bidirectional
1245 if (total_count
< BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM
||
1246 neigh_rq_count
< BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM
)
1249 /* neigh_node->real_packet_count is never zero as we
1250 * only purge old information when getting new
1253 tq_own
= (BATADV_TQ_MAX_VALUE
* total_count
) / neigh_rq_count
;
1255 /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
1256 * affect the nearly-symmetric links only a little, but
1257 * punishes asymmetric links more. This will give a value
1258 * between 0 and TQ_MAX_VALUE
1260 neigh_rq_inv
= BATADV_TQ_LOCAL_WINDOW_SIZE
- neigh_rq_count
;
1261 neigh_rq_inv_cube
= neigh_rq_inv
* neigh_rq_inv
* neigh_rq_inv
;
1262 neigh_rq_max_cube
= BATADV_TQ_LOCAL_WINDOW_SIZE
*
1263 BATADV_TQ_LOCAL_WINDOW_SIZE
*
1264 BATADV_TQ_LOCAL_WINDOW_SIZE
;
1265 inv_asym_penalty
= BATADV_TQ_MAX_VALUE
* neigh_rq_inv_cube
;
1266 inv_asym_penalty
/= neigh_rq_max_cube
;
1267 tq_asym_penalty
= BATADV_TQ_MAX_VALUE
- inv_asym_penalty
;
1269 /* penalize if the OGM is forwarded on the same interface. WiFi
1270 * interfaces and other half duplex devices suffer from throughput
1271 * drops as they can't send and receive at the same time.
1273 tq_iface_penalty
= BATADV_TQ_MAX_VALUE
;
1274 if (if_outgoing
&& (if_incoming
== if_outgoing
) &&
1275 batadv_is_wifi_netdev(if_outgoing
->net_dev
))
1276 tq_iface_penalty
= batadv_hop_penalty(BATADV_TQ_MAX_VALUE
,
1279 combined_tq
= batadv_ogm_packet
->tq
*
1283 combined_tq
/= BATADV_TQ_MAX_VALUE
*
1284 BATADV_TQ_MAX_VALUE
*
1285 BATADV_TQ_MAX_VALUE
;
1286 batadv_ogm_packet
->tq
= combined_tq
;
1288 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1289 "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",
1290 orig_node
->orig
, orig_neigh_node
->orig
, total_count
,
1291 neigh_rq_count
, tq_own
, tq_asym_penalty
, tq_iface_penalty
,
1292 batadv_ogm_packet
->tq
, if_incoming
->net_dev
->name
,
1293 if_outgoing
? if_outgoing
->net_dev
->name
: "DEFAULT");
1295 /* if link has the minimum required transmission quality
1296 * consider it bidirectional
1298 if (batadv_ogm_packet
->tq
>= BATADV_TQ_TOTAL_BIDRECT_LIMIT
)
1303 batadv_neigh_node_put(neigh_node
);
1308 * batadv_iv_ogm_update_seqnos - process a batman packet for all interfaces,
1309 * adjust the sequence number and find out whether it is a duplicate
1310 * @ethhdr: ethernet header of the packet
1311 * @batadv_ogm_packet: OGM packet to be considered
1312 * @if_incoming: interface on which the OGM packet was received
1313 * @if_outgoing: interface for which the retransmission should be considered
1315 * Return: duplicate status as enum batadv_dup_status
1317 static enum batadv_dup_status
1318 batadv_iv_ogm_update_seqnos(const struct ethhdr
*ethhdr
,
1319 const struct batadv_ogm_packet
*batadv_ogm_packet
,
1320 const struct batadv_hard_iface
*if_incoming
,
1321 struct batadv_hard_iface
*if_outgoing
)
1323 struct batadv_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
1324 struct batadv_orig_node
*orig_node
;
1325 struct batadv_orig_ifinfo
*orig_ifinfo
= NULL
;
1326 struct batadv_neigh_node
*neigh_node
;
1327 struct batadv_neigh_ifinfo
*neigh_ifinfo
;
1330 bool need_update
= false;
1332 enum batadv_dup_status ret
= BATADV_NO_DUP
;
1333 u32 seqno
= ntohl(batadv_ogm_packet
->seqno
);
1336 unsigned long *bitmap
;
1338 orig_node
= batadv_iv_ogm_orig_get(bat_priv
, batadv_ogm_packet
->orig
);
1340 return BATADV_NO_DUP
;
1342 orig_ifinfo
= batadv_orig_ifinfo_new(orig_node
, if_outgoing
);
1343 if (WARN_ON(!orig_ifinfo
)) {
1344 batadv_orig_node_put(orig_node
);
1348 spin_lock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
1349 seq_diff
= seqno
- orig_ifinfo
->last_real_seqno
;
1351 /* signalize caller that the packet is to be dropped. */
1352 if (!hlist_empty(&orig_node
->neigh_list
) &&
1353 batadv_window_protected(bat_priv
, seq_diff
,
1354 BATADV_TQ_LOCAL_WINDOW_SIZE
,
1355 &orig_ifinfo
->batman_seqno_reset
, NULL
)) {
1356 ret
= BATADV_PROTECTED
;
1361 hlist_for_each_entry_rcu(neigh_node
, &orig_node
->neigh_list
, list
) {
1362 neigh_ifinfo
= batadv_neigh_ifinfo_new(neigh_node
,
1367 neigh_addr
= neigh_node
->addr
;
1368 is_dup
= batadv_test_bit(neigh_ifinfo
->bat_iv
.real_bits
,
1369 orig_ifinfo
->last_real_seqno
,
1372 if (batadv_compare_eth(neigh_addr
, ethhdr
->h_source
) &&
1373 neigh_node
->if_incoming
== if_incoming
) {
1376 ret
= BATADV_NEIGH_DUP
;
1379 if (is_dup
&& (ret
!= BATADV_NEIGH_DUP
))
1380 ret
= BATADV_ORIG_DUP
;
1383 /* if the window moved, set the update flag. */
1384 bitmap
= neigh_ifinfo
->bat_iv
.real_bits
;
1385 need_update
|= batadv_bit_get_packet(bat_priv
, bitmap
,
1386 seq_diff
, set_mark
);
1388 packet_count
= bitmap_weight(bitmap
,
1389 BATADV_TQ_LOCAL_WINDOW_SIZE
);
1390 neigh_ifinfo
->bat_iv
.real_packet_count
= packet_count
;
1391 batadv_neigh_ifinfo_put(neigh_ifinfo
);
1396 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1397 "%s updating last_seqno: old %u, new %u\n",
1398 if_outgoing
? if_outgoing
->net_dev
->name
: "DEFAULT",
1399 orig_ifinfo
->last_real_seqno
, seqno
);
1400 orig_ifinfo
->last_real_seqno
= seqno
;
1404 spin_unlock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
1405 batadv_orig_node_put(orig_node
);
1406 batadv_orig_ifinfo_put(orig_ifinfo
);
1411 * batadv_iv_ogm_process_per_outif - process a batman iv OGM for an outgoing if
1412 * @skb: the skb containing the OGM
1413 * @ogm_offset: offset from skb->data to start of ogm header
1414 * @orig_node: the (cached) orig node for the originator of this OGM
1415 * @if_incoming: the interface where this packet was received
1416 * @if_outgoing: the interface for which the packet should be considered
1419 batadv_iv_ogm_process_per_outif(const struct sk_buff
*skb
, int ogm_offset
,
1420 struct batadv_orig_node
*orig_node
,
1421 struct batadv_hard_iface
*if_incoming
,
1422 struct batadv_hard_iface
*if_outgoing
)
1424 struct batadv_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
1425 struct batadv_hardif_neigh_node
*hardif_neigh
= NULL
;
1426 struct batadv_neigh_node
*router
= NULL
;
1427 struct batadv_neigh_node
*router_router
= NULL
;
1428 struct batadv_orig_node
*orig_neigh_node
;
1429 struct batadv_orig_ifinfo
*orig_ifinfo
;
1430 struct batadv_neigh_node
*orig_neigh_router
= NULL
;
1431 struct batadv_neigh_ifinfo
*router_ifinfo
= NULL
;
1432 struct batadv_ogm_packet
*ogm_packet
;
1433 enum batadv_dup_status dup_status
;
1434 bool is_from_best_next_hop
= false;
1435 bool is_single_hop_neigh
= false;
1436 bool sameseq
, similar_ttl
;
1437 struct sk_buff
*skb_priv
;
1438 struct ethhdr
*ethhdr
;
1442 /* create a private copy of the skb, as some functions change tq value
1445 skb_priv
= skb_copy(skb
, GFP_ATOMIC
);
1449 ethhdr
= eth_hdr(skb_priv
);
1450 ogm_packet
= (struct batadv_ogm_packet
*)(skb_priv
->data
+ ogm_offset
);
1452 dup_status
= batadv_iv_ogm_update_seqnos(ethhdr
, ogm_packet
,
1453 if_incoming
, if_outgoing
);
1454 if (batadv_compare_eth(ethhdr
->h_source
, ogm_packet
->orig
))
1455 is_single_hop_neigh
= true;
1457 if (dup_status
== BATADV_PROTECTED
) {
1458 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1459 "Drop packet: packet within seqno protection time (sender: %pM)\n",
1464 if (ogm_packet
->tq
== 0) {
1465 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1466 "Drop packet: originator packet with tq equal 0\n");
1470 if (is_single_hop_neigh
) {
1471 hardif_neigh
= batadv_hardif_neigh_get(if_incoming
,
1474 hardif_neigh
->last_seen
= jiffies
;
1477 router
= batadv_orig_router_get(orig_node
, if_outgoing
);
1479 router_router
= batadv_orig_router_get(router
->orig_node
,
1481 router_ifinfo
= batadv_neigh_ifinfo_get(router
, if_outgoing
);
1484 if ((router_ifinfo
&& router_ifinfo
->bat_iv
.tq_avg
!= 0) &&
1485 (batadv_compare_eth(router
->addr
, ethhdr
->h_source
)))
1486 is_from_best_next_hop
= true;
1488 prev_sender
= ogm_packet
->prev_sender
;
1489 /* avoid temporary routing loops */
1490 if (router
&& router_router
&&
1491 (batadv_compare_eth(router
->addr
, prev_sender
)) &&
1492 !(batadv_compare_eth(ogm_packet
->orig
, prev_sender
)) &&
1493 (batadv_compare_eth(router
->addr
, router_router
->addr
))) {
1494 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1495 "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1500 if (if_outgoing
== BATADV_IF_DEFAULT
)
1501 batadv_tvlv_ogm_receive(bat_priv
, ogm_packet
, orig_node
);
1503 /* if sender is a direct neighbor the sender mac equals
1506 if (is_single_hop_neigh
)
1507 orig_neigh_node
= orig_node
;
1509 orig_neigh_node
= batadv_iv_ogm_orig_get(bat_priv
,
1512 if (!orig_neigh_node
)
1515 /* Update nc_nodes of the originator */
1516 batadv_nc_update_nc_node(bat_priv
, orig_node
, orig_neigh_node
,
1517 ogm_packet
, is_single_hop_neigh
);
1519 orig_neigh_router
= batadv_orig_router_get(orig_neigh_node
,
1522 /* drop packet if sender is not a direct neighbor and if we
1523 * don't route towards it
1525 if (!is_single_hop_neigh
&& (!orig_neigh_router
)) {
1526 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1527 "Drop packet: OGM via unknown neighbor!\n");
1531 is_bidirect
= batadv_iv_ogm_calc_tq(orig_node
, orig_neigh_node
,
1532 ogm_packet
, if_incoming
,
1535 /* update ranking if it is not a duplicate or has the same
1536 * seqno and similar ttl as the non-duplicate
1538 orig_ifinfo
= batadv_orig_ifinfo_new(orig_node
, if_outgoing
);
1542 sameseq
= orig_ifinfo
->last_real_seqno
== ntohl(ogm_packet
->seqno
);
1543 similar_ttl
= (orig_ifinfo
->last_ttl
- 3) <= ogm_packet
->ttl
;
1545 if (is_bidirect
&& ((dup_status
== BATADV_NO_DUP
) ||
1546 (sameseq
&& similar_ttl
))) {
1547 batadv_iv_ogm_orig_update(bat_priv
, orig_node
,
1548 orig_ifinfo
, ethhdr
,
1549 ogm_packet
, if_incoming
,
1550 if_outgoing
, dup_status
);
1552 batadv_orig_ifinfo_put(orig_ifinfo
);
1554 /* only forward for specific interface, not for the default one. */
1555 if (if_outgoing
== BATADV_IF_DEFAULT
)
1558 /* is single hop (direct) neighbor */
1559 if (is_single_hop_neigh
) {
1560 /* OGMs from secondary interfaces should only scheduled once
1561 * per interface where it has been received, not multiple times
1563 if ((ogm_packet
->ttl
<= 2) &&
1564 (if_incoming
!= if_outgoing
)) {
1565 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1566 "Drop packet: OGM from secondary interface and wrong outgoing interface\n");
1569 /* mark direct link on incoming interface */
1570 batadv_iv_ogm_forward(orig_node
, ethhdr
, ogm_packet
,
1571 is_single_hop_neigh
,
1572 is_from_best_next_hop
, if_incoming
,
1575 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1576 "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1580 /* multihop originator */
1582 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1583 "Drop packet: not received via bidirectional link\n");
1587 if (dup_status
== BATADV_NEIGH_DUP
) {
1588 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1589 "Drop packet: duplicate packet received\n");
1593 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1594 "Forwarding packet: rebroadcast originator packet\n");
1595 batadv_iv_ogm_forward(orig_node
, ethhdr
, ogm_packet
,
1596 is_single_hop_neigh
, is_from_best_next_hop
,
1597 if_incoming
, if_outgoing
);
1600 if ((orig_neigh_node
) && (!is_single_hop_neigh
))
1601 batadv_orig_node_put(orig_neigh_node
);
1604 batadv_neigh_ifinfo_put(router_ifinfo
);
1606 batadv_neigh_node_put(router
);
1608 batadv_neigh_node_put(router_router
);
1609 if (orig_neigh_router
)
1610 batadv_neigh_node_put(orig_neigh_router
);
1612 batadv_hardif_neigh_put(hardif_neigh
);
1614 kfree_skb(skb_priv
);
1618 * batadv_iv_ogm_process - process an incoming batman iv OGM
1619 * @skb: the skb containing the OGM
1620 * @ogm_offset: offset to the OGM which should be processed (for aggregates)
1621 * @if_incoming: the interface where this packet was receved
1623 static void batadv_iv_ogm_process(const struct sk_buff
*skb
, int ogm_offset
,
1624 struct batadv_hard_iface
*if_incoming
)
1626 struct batadv_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
1627 struct batadv_orig_node
*orig_neigh_node
, *orig_node
;
1628 struct batadv_hard_iface
*hard_iface
;
1629 struct batadv_ogm_packet
*ogm_packet
;
1630 u32 if_incoming_seqno
;
1631 bool has_directlink_flag
;
1632 struct ethhdr
*ethhdr
;
1633 bool is_my_oldorig
= false;
1634 bool is_my_addr
= false;
1635 bool is_my_orig
= false;
1637 ogm_packet
= (struct batadv_ogm_packet
*)(skb
->data
+ ogm_offset
);
1638 ethhdr
= eth_hdr(skb
);
1640 /* Silently drop when the batman packet is actually not a
1643 * This might happen if a packet is padded (e.g. Ethernet has a
1644 * minimum frame length of 64 byte) and the aggregation interprets
1645 * it as an additional length.
1647 * TODO: A more sane solution would be to have a bit in the
1648 * batadv_ogm_packet to detect whether the packet is the last
1649 * packet in an aggregation. Here we expect that the padding
1650 * is always zero (or not 0x01)
1652 if (ogm_packet
->packet_type
!= BATADV_IV_OGM
)
1655 /* could be changed by schedule_own_packet() */
1656 if_incoming_seqno
= atomic_read(&if_incoming
->bat_iv
.ogm_seqno
);
1658 if (ogm_packet
->flags
& BATADV_DIRECTLINK
)
1659 has_directlink_flag
= true;
1661 has_directlink_flag
= false;
1663 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1664 "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",
1665 ethhdr
->h_source
, if_incoming
->net_dev
->name
,
1666 if_incoming
->net_dev
->dev_addr
, ogm_packet
->orig
,
1667 ogm_packet
->prev_sender
, ntohl(ogm_packet
->seqno
),
1668 ogm_packet
->tq
, ogm_packet
->ttl
,
1669 ogm_packet
->version
, has_directlink_flag
);
1672 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
1673 if (hard_iface
->if_status
!= BATADV_IF_ACTIVE
)
1676 if (hard_iface
->soft_iface
!= if_incoming
->soft_iface
)
1679 if (batadv_compare_eth(ethhdr
->h_source
,
1680 hard_iface
->net_dev
->dev_addr
))
1683 if (batadv_compare_eth(ogm_packet
->orig
,
1684 hard_iface
->net_dev
->dev_addr
))
1687 if (batadv_compare_eth(ogm_packet
->prev_sender
,
1688 hard_iface
->net_dev
->dev_addr
))
1689 is_my_oldorig
= true;
1694 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1695 "Drop packet: received my own broadcast (sender: %pM)\n",
1701 unsigned long *word
;
1707 orig_neigh_node
= batadv_iv_ogm_orig_get(bat_priv
,
1709 if (!orig_neigh_node
)
1712 /* neighbor has to indicate direct link and it has to
1713 * come via the corresponding interface
1714 * save packet seqno for bidirectional check
1716 if (has_directlink_flag
&&
1717 batadv_compare_eth(if_incoming
->net_dev
->dev_addr
,
1718 ogm_packet
->orig
)) {
1719 if_num
= if_incoming
->if_num
;
1720 offset
= if_num
* BATADV_NUM_WORDS
;
1722 spin_lock_bh(&orig_neigh_node
->bat_iv
.ogm_cnt_lock
);
1723 word
= &orig_neigh_node
->bat_iv
.bcast_own
[offset
];
1724 bit_pos
= if_incoming_seqno
- 2;
1725 bit_pos
-= ntohl(ogm_packet
->seqno
);
1726 batadv_set_bit(word
, bit_pos
);
1727 weight
= &orig_neigh_node
->bat_iv
.bcast_own_sum
[if_num
];
1728 *weight
= bitmap_weight(word
,
1729 BATADV_TQ_LOCAL_WINDOW_SIZE
);
1730 spin_unlock_bh(&orig_neigh_node
->bat_iv
.ogm_cnt_lock
);
1733 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1734 "Drop packet: originator packet from myself (via neighbor)\n");
1735 batadv_orig_node_put(orig_neigh_node
);
1739 if (is_my_oldorig
) {
1740 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1741 "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1746 if (ogm_packet
->flags
& BATADV_NOT_BEST_NEXT_HOP
) {
1747 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1748 "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1753 orig_node
= batadv_iv_ogm_orig_get(bat_priv
, ogm_packet
->orig
);
1757 batadv_iv_ogm_process_per_outif(skb
, ogm_offset
, orig_node
,
1758 if_incoming
, BATADV_IF_DEFAULT
);
1761 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
1762 if (hard_iface
->if_status
!= BATADV_IF_ACTIVE
)
1765 if (hard_iface
->soft_iface
!= bat_priv
->soft_iface
)
1768 if (!kref_get_unless_zero(&hard_iface
->refcount
))
1771 batadv_iv_ogm_process_per_outif(skb
, ogm_offset
, orig_node
,
1772 if_incoming
, hard_iface
);
1774 batadv_hardif_put(hard_iface
);
1778 batadv_orig_node_put(orig_node
);
1781 static int batadv_iv_ogm_receive(struct sk_buff
*skb
,
1782 struct batadv_hard_iface
*if_incoming
)
1784 struct batadv_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
1785 struct batadv_ogm_packet
*ogm_packet
;
1790 ret
= batadv_check_management_packet(skb
, if_incoming
, BATADV_OGM_HLEN
);
1794 /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1795 * that does not have B.A.T.M.A.N. IV enabled ?
1797 if (bat_priv
->bat_algo_ops
->bat_ogm_emit
!= batadv_iv_ogm_emit
)
1800 batadv_inc_counter(bat_priv
, BATADV_CNT_MGMT_RX
);
1801 batadv_add_counter(bat_priv
, BATADV_CNT_MGMT_RX_BYTES
,
1802 skb
->len
+ ETH_HLEN
);
1805 ogm_packet
= (struct batadv_ogm_packet
*)skb
->data
;
1807 /* unpack the aggregated packets and process them one by one */
1808 while (batadv_iv_ogm_aggr_packet(ogm_offset
, skb_headlen(skb
),
1809 ogm_packet
->tvlv_len
)) {
1810 batadv_iv_ogm_process(skb
, ogm_offset
, if_incoming
);
1812 ogm_offset
+= BATADV_OGM_HLEN
;
1813 ogm_offset
+= ntohs(ogm_packet
->tvlv_len
);
1815 packet_pos
= skb
->data
+ ogm_offset
;
1816 ogm_packet
= (struct batadv_ogm_packet
*)packet_pos
;
1820 return NET_RX_SUCCESS
;
1824 * batadv_iv_ogm_orig_print_neigh - print neighbors for the originator table
1825 * @orig_node: the orig_node for which the neighbors are printed
1826 * @if_outgoing: outgoing interface for these entries
1827 * @seq: debugfs table seq_file struct
1829 * Must be called while holding an rcu lock.
1832 batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node
*orig_node
,
1833 struct batadv_hard_iface
*if_outgoing
,
1834 struct seq_file
*seq
)
1836 struct batadv_neigh_node
*neigh_node
;
1837 struct batadv_neigh_ifinfo
*n_ifinfo
;
1839 hlist_for_each_entry_rcu(neigh_node
, &orig_node
->neigh_list
, list
) {
1840 n_ifinfo
= batadv_neigh_ifinfo_get(neigh_node
, if_outgoing
);
1844 seq_printf(seq
, " %pM (%3i)",
1846 n_ifinfo
->bat_iv
.tq_avg
);
1848 batadv_neigh_ifinfo_put(n_ifinfo
);
1853 * batadv_iv_ogm_orig_print - print the originator table
1854 * @bat_priv: the bat priv with all the soft interface information
1855 * @seq: debugfs table seq_file struct
1856 * @if_outgoing: the outgoing interface for which this should be printed
1858 static void batadv_iv_ogm_orig_print(struct batadv_priv
*bat_priv
,
1859 struct seq_file
*seq
,
1860 struct batadv_hard_iface
*if_outgoing
)
1862 struct batadv_neigh_node
*neigh_node
;
1863 struct batadv_hashtable
*hash
= bat_priv
->orig_hash
;
1864 int last_seen_msecs
, last_seen_secs
;
1865 struct batadv_orig_node
*orig_node
;
1866 struct batadv_neigh_ifinfo
*n_ifinfo
;
1867 unsigned long last_seen_jiffies
;
1868 struct hlist_head
*head
;
1869 int batman_count
= 0;
1873 " Originator last-seen (#/255) Nexthop [outgoingIF]: Potential nexthops ...\n");
1875 for (i
= 0; i
< hash
->size
; i
++) {
1876 head
= &hash
->table
[i
];
1879 hlist_for_each_entry_rcu(orig_node
, head
, hash_entry
) {
1880 neigh_node
= batadv_orig_router_get(orig_node
,
1885 n_ifinfo
= batadv_neigh_ifinfo_get(neigh_node
,
1890 if (n_ifinfo
->bat_iv
.tq_avg
== 0)
1893 last_seen_jiffies
= jiffies
- orig_node
->last_seen
;
1894 last_seen_msecs
= jiffies_to_msecs(last_seen_jiffies
);
1895 last_seen_secs
= last_seen_msecs
/ 1000;
1896 last_seen_msecs
= last_seen_msecs
% 1000;
1898 seq_printf(seq
, "%pM %4i.%03is (%3i) %pM [%10s]:",
1899 orig_node
->orig
, last_seen_secs
,
1900 last_seen_msecs
, n_ifinfo
->bat_iv
.tq_avg
,
1902 neigh_node
->if_incoming
->net_dev
->name
);
1904 batadv_iv_ogm_orig_print_neigh(orig_node
, if_outgoing
,
1906 seq_puts(seq
, "\n");
1910 batadv_neigh_node_put(neigh_node
);
1912 batadv_neigh_ifinfo_put(n_ifinfo
);
1917 if (batman_count
== 0)
1918 seq_puts(seq
, "No batman nodes in range ...\n");
1922 * batadv_iv_hardif_neigh_print - print a single hop neighbour node
1923 * @seq: neighbour table seq_file struct
1924 * @hardif_neigh: hardif neighbour information
1927 batadv_iv_hardif_neigh_print(struct seq_file
*seq
,
1928 struct batadv_hardif_neigh_node
*hardif_neigh
)
1930 int last_secs
, last_msecs
;
1932 last_secs
= jiffies_to_msecs(jiffies
- hardif_neigh
->last_seen
) / 1000;
1933 last_msecs
= jiffies_to_msecs(jiffies
- hardif_neigh
->last_seen
) % 1000;
1935 seq_printf(seq
, " %10s %pM %4i.%03is\n",
1936 hardif_neigh
->if_incoming
->net_dev
->name
,
1937 hardif_neigh
->addr
, last_secs
, last_msecs
);
1941 * batadv_iv_ogm_neigh_print - print the single hop neighbour list
1942 * @bat_priv: the bat priv with all the soft interface information
1943 * @seq: neighbour table seq_file struct
1945 static void batadv_iv_neigh_print(struct batadv_priv
*bat_priv
,
1946 struct seq_file
*seq
)
1948 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
1949 struct batadv_hardif_neigh_node
*hardif_neigh
;
1950 struct batadv_hard_iface
*hard_iface
;
1951 int batman_count
= 0;
1953 seq_puts(seq
, " IF Neighbor last-seen\n");
1956 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
1957 if (hard_iface
->soft_iface
!= net_dev
)
1960 hlist_for_each_entry_rcu(hardif_neigh
,
1961 &hard_iface
->neigh_list
, list
) {
1962 batadv_iv_hardif_neigh_print(seq
, hardif_neigh
);
1968 if (batman_count
== 0)
1969 seq_puts(seq
, "No batman nodes in range ...\n");
1973 * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors
1974 * @neigh1: the first neighbor object of the comparison
1975 * @if_outgoing1: outgoing interface for the first neighbor
1976 * @neigh2: the second neighbor object of the comparison
1977 * @if_outgoing2: outgoing interface for the second neighbor
1979 * Return: a value less, equal to or greater than 0 if the metric via neigh1 is
1980 * lower, the same as or higher than the metric via neigh2
1982 static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node
*neigh1
,
1983 struct batadv_hard_iface
*if_outgoing1
,
1984 struct batadv_neigh_node
*neigh2
,
1985 struct batadv_hard_iface
*if_outgoing2
)
1987 struct batadv_neigh_ifinfo
*neigh1_ifinfo
, *neigh2_ifinfo
;
1991 neigh1_ifinfo
= batadv_neigh_ifinfo_get(neigh1
, if_outgoing1
);
1992 neigh2_ifinfo
= batadv_neigh_ifinfo_get(neigh2
, if_outgoing2
);
1994 if (!neigh1_ifinfo
|| !neigh2_ifinfo
) {
1999 tq1
= neigh1_ifinfo
->bat_iv
.tq_avg
;
2000 tq2
= neigh2_ifinfo
->bat_iv
.tq_avg
;
2005 batadv_neigh_ifinfo_put(neigh1_ifinfo
);
2007 batadv_neigh_ifinfo_put(neigh2_ifinfo
);
2013 * batadv_iv_ogm_neigh_is_sob - check if neigh1 is similarly good or better
2014 * than neigh2 from the metric prospective
2015 * @neigh1: the first neighbor object of the comparison
2016 * @if_outgoing1: outgoing interface for the first neighbor
2017 * @neigh2: the second neighbor object of the comparison
2018 * @if_outgoing2: outgoing interface for the second neighbor
2020 * Return: true if the metric via neigh1 is equally good or better than
2021 * the metric via neigh2, false otherwise.
2024 batadv_iv_ogm_neigh_is_sob(struct batadv_neigh_node
*neigh1
,
2025 struct batadv_hard_iface
*if_outgoing1
,
2026 struct batadv_neigh_node
*neigh2
,
2027 struct batadv_hard_iface
*if_outgoing2
)
2029 struct batadv_neigh_ifinfo
*neigh1_ifinfo
, *neigh2_ifinfo
;
2033 neigh1_ifinfo
= batadv_neigh_ifinfo_get(neigh1
, if_outgoing1
);
2034 neigh2_ifinfo
= batadv_neigh_ifinfo_get(neigh2
, if_outgoing2
);
2036 /* we can't say that the metric is better */
2037 if (!neigh1_ifinfo
|| !neigh2_ifinfo
) {
2042 tq1
= neigh1_ifinfo
->bat_iv
.tq_avg
;
2043 tq2
= neigh2_ifinfo
->bat_iv
.tq_avg
;
2044 ret
= (tq1
- tq2
) > -BATADV_TQ_SIMILARITY_THRESHOLD
;
2048 batadv_neigh_ifinfo_put(neigh1_ifinfo
);
2050 batadv_neigh_ifinfo_put(neigh2_ifinfo
);
2055 static struct batadv_algo_ops batadv_batman_iv __read_mostly
= {
2056 .name
= "BATMAN_IV",
2057 .bat_iface_enable
= batadv_iv_ogm_iface_enable
,
2058 .bat_iface_disable
= batadv_iv_ogm_iface_disable
,
2059 .bat_iface_update_mac
= batadv_iv_ogm_iface_update_mac
,
2060 .bat_primary_iface_set
= batadv_iv_ogm_primary_iface_set
,
2061 .bat_ogm_schedule
= batadv_iv_ogm_schedule
,
2062 .bat_ogm_emit
= batadv_iv_ogm_emit
,
2063 .bat_neigh_cmp
= batadv_iv_ogm_neigh_cmp
,
2064 .bat_neigh_is_similar_or_better
= batadv_iv_ogm_neigh_is_sob
,
2065 .bat_neigh_print
= batadv_iv_neigh_print
,
2066 .bat_orig_print
= batadv_iv_ogm_orig_print
,
2067 .bat_orig_free
= batadv_iv_ogm_orig_free
,
2068 .bat_orig_add_if
= batadv_iv_ogm_orig_add_if
,
2069 .bat_orig_del_if
= batadv_iv_ogm_orig_del_if
,
2072 int __init
batadv_iv_init(void)
2076 /* batman originator packet */
2077 ret
= batadv_recv_handler_register(BATADV_IV_OGM
,
2078 batadv_iv_ogm_receive
);
2082 ret
= batadv_algo_register(&batadv_batman_iv
);
2084 goto handler_unregister
;
2089 batadv_recv_handler_unregister(BATADV_IV_OGM
);