1 /* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors:
3 * Marek Lindner, Simon Wunderlich
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of version 2 of the GNU General Public
7 * License as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 #include "translation-table.h"
22 #include "originator.h"
24 #include "gateway_common.h"
25 #include "gateway_client.h"
26 #include "hard-interface.h"
29 #include "network-coding.h"
33 * batadv_dup_status - duplicate status
34 * @BATADV_NO_DUP: the packet is a duplicate
35 * @BATADV_ORIG_DUP: OGM is a duplicate in the originator (but not for the
37 * @BATADV_NEIGH_DUP: OGM is a duplicate for the neighbor
38 * @BATADV_PROTECTED: originator is currently protected (after reboot)
40 enum batadv_dup_status
{
48 * batadv_ring_buffer_set - update the ring buffer with the given value
49 * @lq_recv: pointer to the ring buffer
50 * @lq_index: index to store the value at
51 * @value: value to store in the ring buffer
53 static void batadv_ring_buffer_set(uint8_t lq_recv
[], uint8_t *lq_index
,
56 lq_recv
[*lq_index
] = value
;
57 *lq_index
= (*lq_index
+ 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE
;
61 * batadv_ring_buffer_set - compute the average of all non-zero values stored
62 * in the given ring buffer
63 * @lq_recv: pointer to the ring buffer
65 * Returns computed average value.
67 static uint8_t batadv_ring_buffer_avg(const uint8_t lq_recv
[])
70 uint16_t count
= 0, i
= 0, sum
= 0;
74 while (i
< BATADV_TQ_GLOBAL_WINDOW_SIZE
) {
87 return (uint8_t)(sum
/ count
);
91 * batadv_iv_ogm_orig_free - free the private resources allocated for this
93 * @orig_node: the orig_node for which the resources have to be free'd
95 static void batadv_iv_ogm_orig_free(struct batadv_orig_node
*orig_node
)
97 kfree(orig_node
->bat_iv
.bcast_own
);
98 kfree(orig_node
->bat_iv
.bcast_own_sum
);
102 * batadv_iv_ogm_orig_add_if - change the private structures of the orig_node to
103 * include the new hard-interface
104 * @orig_node: the orig_node that has to be changed
105 * @max_if_num: the current amount of interfaces
107 * Returns 0 on success, a negative error code otherwise.
109 static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node
*orig_node
,
113 size_t data_size
, old_size
;
116 spin_lock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
118 data_size
= max_if_num
* sizeof(unsigned long) * BATADV_NUM_WORDS
;
119 old_size
= (max_if_num
- 1) * sizeof(unsigned long) * BATADV_NUM_WORDS
;
120 data_ptr
= kmalloc(data_size
, GFP_ATOMIC
);
124 memcpy(data_ptr
, orig_node
->bat_iv
.bcast_own
, old_size
);
125 kfree(orig_node
->bat_iv
.bcast_own
);
126 orig_node
->bat_iv
.bcast_own
= data_ptr
;
128 data_ptr
= kmalloc(max_if_num
* sizeof(uint8_t), GFP_ATOMIC
);
130 kfree(orig_node
->bat_iv
.bcast_own
);
134 memcpy(data_ptr
, orig_node
->bat_iv
.bcast_own_sum
,
135 (max_if_num
- 1) * sizeof(uint8_t));
136 kfree(orig_node
->bat_iv
.bcast_own_sum
);
137 orig_node
->bat_iv
.bcast_own_sum
= data_ptr
;
142 spin_unlock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
148 * batadv_iv_ogm_orig_del_if - change the private structures of the orig_node to
149 * exclude the removed interface
150 * @orig_node: the orig_node that has to be changed
151 * @max_if_num: the current amount of interfaces
152 * @del_if_num: the index of the interface being removed
154 * Returns 0 on success, a negative error code otherwise.
156 static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node
*orig_node
,
157 int max_if_num
, int del_if_num
)
159 int chunk_size
, ret
= -ENOMEM
, if_offset
;
160 void *data_ptr
= NULL
;
162 spin_lock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
164 /* last interface was removed */
168 chunk_size
= sizeof(unsigned long) * BATADV_NUM_WORDS
;
169 data_ptr
= kmalloc(max_if_num
* chunk_size
, GFP_ATOMIC
);
173 /* copy first part */
174 memcpy(data_ptr
, orig_node
->bat_iv
.bcast_own
, del_if_num
* chunk_size
);
176 /* copy second part */
177 memcpy((char *)data_ptr
+ del_if_num
* chunk_size
,
178 orig_node
->bat_iv
.bcast_own
+ ((del_if_num
+ 1) * chunk_size
),
179 (max_if_num
- del_if_num
) * chunk_size
);
182 kfree(orig_node
->bat_iv
.bcast_own
);
183 orig_node
->bat_iv
.bcast_own
= data_ptr
;
188 data_ptr
= kmalloc(max_if_num
* sizeof(uint8_t), GFP_ATOMIC
);
190 kfree(orig_node
->bat_iv
.bcast_own
);
194 memcpy(data_ptr
, orig_node
->bat_iv
.bcast_own_sum
,
195 del_if_num
* sizeof(uint8_t));
197 if_offset
= (del_if_num
+ 1) * sizeof(uint8_t);
198 memcpy((char *)data_ptr
+ del_if_num
* sizeof(uint8_t),
199 orig_node
->bat_iv
.bcast_own_sum
+ if_offset
,
200 (max_if_num
- del_if_num
) * sizeof(uint8_t));
203 kfree(orig_node
->bat_iv
.bcast_own_sum
);
204 orig_node
->bat_iv
.bcast_own_sum
= data_ptr
;
208 spin_unlock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
214 * batadv_iv_ogm_orig_get - retrieve or create (if does not exist) an originator
215 * @bat_priv: the bat priv with all the soft interface information
216 * @addr: mac address of the originator
218 * Returns the originator object corresponding to the passed mac address or NULL
220 * If the object does not exists it is created an initialised.
222 static struct batadv_orig_node
*
223 batadv_iv_ogm_orig_get(struct batadv_priv
*bat_priv
, const uint8_t *addr
)
225 struct batadv_orig_node
*orig_node
;
226 int size
, hash_added
;
228 orig_node
= batadv_orig_hash_find(bat_priv
, addr
);
232 orig_node
= batadv_orig_node_new(bat_priv
, addr
);
236 spin_lock_init(&orig_node
->bat_iv
.ogm_cnt_lock
);
238 size
= bat_priv
->num_ifaces
* sizeof(unsigned long) * BATADV_NUM_WORDS
;
239 orig_node
->bat_iv
.bcast_own
= kzalloc(size
, GFP_ATOMIC
);
240 if (!orig_node
->bat_iv
.bcast_own
)
243 size
= bat_priv
->num_ifaces
* sizeof(uint8_t);
244 orig_node
->bat_iv
.bcast_own_sum
= kzalloc(size
, GFP_ATOMIC
);
245 if (!orig_node
->bat_iv
.bcast_own_sum
)
248 hash_added
= batadv_hash_add(bat_priv
->orig_hash
, batadv_compare_orig
,
249 batadv_choose_orig
, orig_node
,
250 &orig_node
->hash_entry
);
257 kfree(orig_node
->bat_iv
.bcast_own
);
259 batadv_orig_node_free_ref(orig_node
);
264 static struct batadv_neigh_node
*
265 batadv_iv_ogm_neigh_new(struct batadv_hard_iface
*hard_iface
,
266 const uint8_t *neigh_addr
,
267 struct batadv_orig_node
*orig_node
,
268 struct batadv_orig_node
*orig_neigh
)
270 struct batadv_priv
*bat_priv
= netdev_priv(hard_iface
->soft_iface
);
271 struct batadv_neigh_node
*neigh_node
;
273 neigh_node
= batadv_neigh_node_new(hard_iface
, neigh_addr
, orig_node
);
277 spin_lock_init(&neigh_node
->bat_iv
.lq_update_lock
);
279 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
280 "Creating new neighbor %pM for orig_node %pM on interface %s\n",
281 neigh_addr
, orig_node
->orig
, hard_iface
->net_dev
->name
);
283 spin_lock_bh(&orig_node
->neigh_list_lock
);
284 hlist_add_head_rcu(&neigh_node
->list
, &orig_node
->neigh_list
);
285 spin_unlock_bh(&orig_node
->neigh_list_lock
);
291 static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface
*hard_iface
)
293 struct batadv_ogm_packet
*batadv_ogm_packet
;
294 unsigned char *ogm_buff
;
295 uint32_t random_seqno
;
298 /* randomize initial seqno to avoid collision */
299 get_random_bytes(&random_seqno
, sizeof(random_seqno
));
300 atomic_set(&hard_iface
->bat_iv
.ogm_seqno
, random_seqno
);
302 hard_iface
->bat_iv
.ogm_buff_len
= BATADV_OGM_HLEN
;
303 ogm_buff
= kmalloc(hard_iface
->bat_iv
.ogm_buff_len
, GFP_ATOMIC
);
307 hard_iface
->bat_iv
.ogm_buff
= ogm_buff
;
309 batadv_ogm_packet
= (struct batadv_ogm_packet
*)ogm_buff
;
310 batadv_ogm_packet
->packet_type
= BATADV_IV_OGM
;
311 batadv_ogm_packet
->version
= BATADV_COMPAT_VERSION
;
312 batadv_ogm_packet
->ttl
= 2;
313 batadv_ogm_packet
->flags
= BATADV_NO_FLAGS
;
314 batadv_ogm_packet
->reserved
= 0;
315 batadv_ogm_packet
->tq
= BATADV_TQ_MAX_VALUE
;
323 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface
*hard_iface
)
325 kfree(hard_iface
->bat_iv
.ogm_buff
);
326 hard_iface
->bat_iv
.ogm_buff
= NULL
;
329 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface
*hard_iface
)
331 struct batadv_ogm_packet
*batadv_ogm_packet
;
332 unsigned char *ogm_buff
= hard_iface
->bat_iv
.ogm_buff
;
334 batadv_ogm_packet
= (struct batadv_ogm_packet
*)ogm_buff
;
335 memcpy(batadv_ogm_packet
->orig
,
336 hard_iface
->net_dev
->dev_addr
, ETH_ALEN
);
337 memcpy(batadv_ogm_packet
->prev_sender
,
338 hard_iface
->net_dev
->dev_addr
, ETH_ALEN
);
342 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface
*hard_iface
)
344 struct batadv_ogm_packet
*batadv_ogm_packet
;
345 unsigned char *ogm_buff
= hard_iface
->bat_iv
.ogm_buff
;
347 batadv_ogm_packet
= (struct batadv_ogm_packet
*)ogm_buff
;
348 batadv_ogm_packet
->flags
= BATADV_PRIMARIES_FIRST_HOP
;
349 batadv_ogm_packet
->ttl
= BATADV_TTL
;
352 /* when do we schedule our own ogm to be sent */
354 batadv_iv_ogm_emit_send_time(const struct batadv_priv
*bat_priv
)
358 msecs
= atomic_read(&bat_priv
->orig_interval
) - BATADV_JITTER
;
359 msecs
+= prandom_u32() % (2 * BATADV_JITTER
);
361 return jiffies
+ msecs_to_jiffies(msecs
);
364 /* when do we schedule a ogm packet to be sent */
365 static unsigned long batadv_iv_ogm_fwd_send_time(void)
367 return jiffies
+ msecs_to_jiffies(prandom_u32() % (BATADV_JITTER
/ 2));
370 /* apply hop penalty for a normal link */
371 static uint8_t batadv_hop_penalty(uint8_t tq
,
372 const struct batadv_priv
*bat_priv
)
374 int hop_penalty
= atomic_read(&bat_priv
->hop_penalty
);
377 new_tq
= tq
* (BATADV_TQ_MAX_VALUE
- hop_penalty
);
378 new_tq
/= BATADV_TQ_MAX_VALUE
;
383 /* is there another aggregated packet here? */
384 static int batadv_iv_ogm_aggr_packet(int buff_pos
, int packet_len
,
387 int next_buff_pos
= 0;
389 next_buff_pos
+= buff_pos
+ BATADV_OGM_HLEN
;
390 next_buff_pos
+= ntohs(tvlv_len
);
392 return (next_buff_pos
<= packet_len
) &&
393 (next_buff_pos
<= BATADV_MAX_AGGREGATION_BYTES
);
396 /* send a batman ogm to a given interface */
397 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet
*forw_packet
,
398 struct batadv_hard_iface
*hard_iface
)
400 struct batadv_priv
*bat_priv
= netdev_priv(hard_iface
->soft_iface
);
404 struct batadv_ogm_packet
*batadv_ogm_packet
;
408 if (hard_iface
->if_status
!= BATADV_IF_ACTIVE
)
413 packet_pos
= forw_packet
->skb
->data
;
414 batadv_ogm_packet
= (struct batadv_ogm_packet
*)packet_pos
;
416 /* adjust all flags and log packets */
417 while (batadv_iv_ogm_aggr_packet(buff_pos
, forw_packet
->packet_len
,
418 batadv_ogm_packet
->tvlv_len
)) {
419 /* we might have aggregated direct link packets with an
420 * ordinary base packet
422 if (forw_packet
->direct_link_flags
& BIT(packet_num
) &&
423 forw_packet
->if_incoming
== hard_iface
)
424 batadv_ogm_packet
->flags
|= BATADV_DIRECTLINK
;
426 batadv_ogm_packet
->flags
&= ~BATADV_DIRECTLINK
;
428 if (packet_num
> 0 || !forw_packet
->own
)
429 fwd_str
= "Forwarding";
431 fwd_str
= "Sending own";
433 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
434 "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n",
435 fwd_str
, (packet_num
> 0 ? "aggregated " : ""),
436 batadv_ogm_packet
->orig
,
437 ntohl(batadv_ogm_packet
->seqno
),
438 batadv_ogm_packet
->tq
, batadv_ogm_packet
->ttl
,
439 (batadv_ogm_packet
->flags
& BATADV_DIRECTLINK
?
441 hard_iface
->net_dev
->name
,
442 hard_iface
->net_dev
->dev_addr
);
444 buff_pos
+= BATADV_OGM_HLEN
;
445 buff_pos
+= ntohs(batadv_ogm_packet
->tvlv_len
);
447 packet_pos
= forw_packet
->skb
->data
+ buff_pos
;
448 batadv_ogm_packet
= (struct batadv_ogm_packet
*)packet_pos
;
451 /* create clone because function is called more than once */
452 skb
= skb_clone(forw_packet
->skb
, GFP_ATOMIC
);
454 batadv_inc_counter(bat_priv
, BATADV_CNT_MGMT_TX
);
455 batadv_add_counter(bat_priv
, BATADV_CNT_MGMT_TX_BYTES
,
456 skb
->len
+ ETH_HLEN
);
457 batadv_send_skb_packet(skb
, hard_iface
, batadv_broadcast_addr
);
461 /* send a batman ogm packet */
462 static void batadv_iv_ogm_emit(struct batadv_forw_packet
*forw_packet
)
464 struct batadv_hard_iface
*hard_iface
;
465 struct net_device
*soft_iface
;
466 struct batadv_priv
*bat_priv
;
467 struct batadv_hard_iface
*primary_if
= NULL
;
468 struct batadv_ogm_packet
*batadv_ogm_packet
;
469 unsigned char directlink
;
472 packet_pos
= forw_packet
->skb
->data
;
473 batadv_ogm_packet
= (struct batadv_ogm_packet
*)packet_pos
;
474 directlink
= (batadv_ogm_packet
->flags
& BATADV_DIRECTLINK
? 1 : 0);
476 if (!forw_packet
->if_incoming
) {
477 pr_err("Error - can't forward packet: incoming iface not specified\n");
481 soft_iface
= forw_packet
->if_incoming
->soft_iface
;
482 bat_priv
= netdev_priv(soft_iface
);
484 if (forw_packet
->if_incoming
->if_status
!= BATADV_IF_ACTIVE
)
487 primary_if
= batadv_primary_if_get_selected(bat_priv
);
491 /* multihomed peer assumed
492 * non-primary OGMs are only broadcasted on their interface
494 if ((directlink
&& (batadv_ogm_packet
->ttl
== 1)) ||
495 (forw_packet
->own
&& (forw_packet
->if_incoming
!= primary_if
))) {
496 /* FIXME: what about aggregated packets ? */
497 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
498 "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n",
499 (forw_packet
->own
? "Sending own" : "Forwarding"),
500 batadv_ogm_packet
->orig
,
501 ntohl(batadv_ogm_packet
->seqno
),
502 batadv_ogm_packet
->ttl
,
503 forw_packet
->if_incoming
->net_dev
->name
,
504 forw_packet
->if_incoming
->net_dev
->dev_addr
);
506 /* skb is only used once and than forw_packet is free'd */
507 batadv_send_skb_packet(forw_packet
->skb
,
508 forw_packet
->if_incoming
,
509 batadv_broadcast_addr
);
510 forw_packet
->skb
= NULL
;
515 /* broadcast on every interface */
517 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
518 if (hard_iface
->soft_iface
!= soft_iface
)
521 batadv_iv_ogm_send_to_if(forw_packet
, hard_iface
);
527 batadv_hardif_free_ref(primary_if
);
530 /* return true if new_packet can be aggregated with forw_packet */
532 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet
*new_bat_ogm_packet
,
533 struct batadv_priv
*bat_priv
,
534 int packet_len
, unsigned long send_time
,
536 const struct batadv_hard_iface
*if_incoming
,
537 const struct batadv_forw_packet
*forw_packet
)
539 struct batadv_ogm_packet
*batadv_ogm_packet
;
540 int aggregated_bytes
= forw_packet
->packet_len
+ packet_len
;
541 struct batadv_hard_iface
*primary_if
= NULL
;
543 unsigned long aggregation_end_time
;
545 batadv_ogm_packet
= (struct batadv_ogm_packet
*)forw_packet
->skb
->data
;
546 aggregation_end_time
= send_time
;
547 aggregation_end_time
+= msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS
);
549 /* we can aggregate the current packet to this aggregated packet
552 * - the send time is within our MAX_AGGREGATION_MS time
553 * - the resulting packet wont be bigger than
554 * MAX_AGGREGATION_BYTES
556 if (time_before(send_time
, forw_packet
->send_time
) &&
557 time_after_eq(aggregation_end_time
, forw_packet
->send_time
) &&
558 (aggregated_bytes
<= BATADV_MAX_AGGREGATION_BYTES
)) {
559 /* check aggregation compatibility
560 * -> direct link packets are broadcasted on
561 * their interface only
562 * -> aggregate packet if the current packet is
563 * a "global" packet as well as the base
566 primary_if
= batadv_primary_if_get_selected(bat_priv
);
570 /* packets without direct link flag and high TTL
571 * are flooded through the net
574 (!(batadv_ogm_packet
->flags
& BATADV_DIRECTLINK
)) &&
575 (batadv_ogm_packet
->ttl
!= 1) &&
577 /* own packets originating non-primary
578 * interfaces leave only that interface
580 ((!forw_packet
->own
) ||
581 (forw_packet
->if_incoming
== primary_if
))) {
586 /* if the incoming packet is sent via this one
587 * interface only - we still can aggregate
590 (new_bat_ogm_packet
->ttl
== 1) &&
591 (forw_packet
->if_incoming
== if_incoming
) &&
593 /* packets from direct neighbors or
594 * own secondary interface packets
595 * (= secondary interface packets in general)
597 (batadv_ogm_packet
->flags
& BATADV_DIRECTLINK
||
599 forw_packet
->if_incoming
!= primary_if
))) {
607 batadv_hardif_free_ref(primary_if
);
611 /* create a new aggregated packet and add this packet to it */
612 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff
,
613 int packet_len
, unsigned long send_time
,
615 struct batadv_hard_iface
*if_incoming
,
618 struct batadv_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
619 struct batadv_forw_packet
*forw_packet_aggr
;
620 unsigned char *skb_buff
;
621 unsigned int skb_size
;
623 if (!atomic_inc_not_zero(&if_incoming
->refcount
))
626 /* own packet should always be scheduled */
628 if (!batadv_atomic_dec_not_zero(&bat_priv
->batman_queue_left
)) {
629 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
630 "batman packet queue full\n");
635 forw_packet_aggr
= kmalloc(sizeof(*forw_packet_aggr
), GFP_ATOMIC
);
636 if (!forw_packet_aggr
) {
638 atomic_inc(&bat_priv
->batman_queue_left
);
642 if ((atomic_read(&bat_priv
->aggregated_ogms
)) &&
643 (packet_len
< BATADV_MAX_AGGREGATION_BYTES
))
644 skb_size
= BATADV_MAX_AGGREGATION_BYTES
;
646 skb_size
= packet_len
;
648 skb_size
+= ETH_HLEN
;
650 forw_packet_aggr
->skb
= netdev_alloc_skb_ip_align(NULL
, skb_size
);
651 if (!forw_packet_aggr
->skb
) {
653 atomic_inc(&bat_priv
->batman_queue_left
);
654 kfree(forw_packet_aggr
);
657 forw_packet_aggr
->skb
->priority
= TC_PRIO_CONTROL
;
658 skb_reserve(forw_packet_aggr
->skb
, ETH_HLEN
);
660 skb_buff
= skb_put(forw_packet_aggr
->skb
, packet_len
);
661 forw_packet_aggr
->packet_len
= packet_len
;
662 memcpy(skb_buff
, packet_buff
, packet_len
);
664 forw_packet_aggr
->own
= own_packet
;
665 forw_packet_aggr
->if_incoming
= if_incoming
;
666 forw_packet_aggr
->num_packets
= 0;
667 forw_packet_aggr
->direct_link_flags
= BATADV_NO_FLAGS
;
668 forw_packet_aggr
->send_time
= send_time
;
670 /* save packet direct link flag status */
672 forw_packet_aggr
->direct_link_flags
|= 1;
674 /* add new packet to packet list */
675 spin_lock_bh(&bat_priv
->forw_bat_list_lock
);
676 hlist_add_head(&forw_packet_aggr
->list
, &bat_priv
->forw_bat_list
);
677 spin_unlock_bh(&bat_priv
->forw_bat_list_lock
);
679 /* start timer for this packet */
680 INIT_DELAYED_WORK(&forw_packet_aggr
->delayed_work
,
681 batadv_send_outstanding_bat_ogm_packet
);
682 queue_delayed_work(batadv_event_workqueue
,
683 &forw_packet_aggr
->delayed_work
,
684 send_time
- jiffies
);
688 batadv_hardif_free_ref(if_incoming
);
691 /* aggregate a new packet into the existing ogm packet */
692 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet
*forw_packet_aggr
,
693 const unsigned char *packet_buff
,
694 int packet_len
, bool direct_link
)
696 unsigned char *skb_buff
;
697 unsigned long new_direct_link_flag
;
699 skb_buff
= skb_put(forw_packet_aggr
->skb
, packet_len
);
700 memcpy(skb_buff
, packet_buff
, packet_len
);
701 forw_packet_aggr
->packet_len
+= packet_len
;
702 forw_packet_aggr
->num_packets
++;
704 /* save packet direct link flag status */
706 new_direct_link_flag
= BIT(forw_packet_aggr
->num_packets
);
707 forw_packet_aggr
->direct_link_flags
|= new_direct_link_flag
;
711 static void batadv_iv_ogm_queue_add(struct batadv_priv
*bat_priv
,
712 unsigned char *packet_buff
,
714 struct batadv_hard_iface
*if_incoming
,
715 int own_packet
, unsigned long send_time
)
717 /* _aggr -> pointer to the packet we want to aggregate with
718 * _pos -> pointer to the position in the queue
720 struct batadv_forw_packet
*forw_packet_aggr
= NULL
;
721 struct batadv_forw_packet
*forw_packet_pos
= NULL
;
722 struct batadv_ogm_packet
*batadv_ogm_packet
;
724 unsigned long max_aggregation_jiffies
;
726 batadv_ogm_packet
= (struct batadv_ogm_packet
*)packet_buff
;
727 direct_link
= batadv_ogm_packet
->flags
& BATADV_DIRECTLINK
? 1 : 0;
728 max_aggregation_jiffies
= msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS
);
730 /* find position for the packet in the forward queue */
731 spin_lock_bh(&bat_priv
->forw_bat_list_lock
);
732 /* own packets are not to be aggregated */
733 if ((atomic_read(&bat_priv
->aggregated_ogms
)) && (!own_packet
)) {
734 hlist_for_each_entry(forw_packet_pos
,
735 &bat_priv
->forw_bat_list
, list
) {
736 if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet
,
737 bat_priv
, packet_len
,
738 send_time
, direct_link
,
741 forw_packet_aggr
= forw_packet_pos
;
747 /* nothing to aggregate with - either aggregation disabled or no
748 * suitable aggregation packet found
750 if (!forw_packet_aggr
) {
751 /* the following section can run without the lock */
752 spin_unlock_bh(&bat_priv
->forw_bat_list_lock
);
754 /* if we could not aggregate this packet with one of the others
755 * we hold it back for a while, so that it might be aggregated
758 if (!own_packet
&& atomic_read(&bat_priv
->aggregated_ogms
))
759 send_time
+= max_aggregation_jiffies
;
761 batadv_iv_ogm_aggregate_new(packet_buff
, packet_len
,
762 send_time
, direct_link
,
763 if_incoming
, own_packet
);
765 batadv_iv_ogm_aggregate(forw_packet_aggr
, packet_buff
,
766 packet_len
, direct_link
);
767 spin_unlock_bh(&bat_priv
->forw_bat_list_lock
);
771 static void batadv_iv_ogm_forward(struct batadv_orig_node
*orig_node
,
772 const struct ethhdr
*ethhdr
,
773 struct batadv_ogm_packet
*batadv_ogm_packet
,
774 bool is_single_hop_neigh
,
775 bool is_from_best_next_hop
,
776 struct batadv_hard_iface
*if_incoming
)
778 struct batadv_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
781 if (batadv_ogm_packet
->ttl
<= 1) {
782 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
, "ttl exceeded\n");
786 if (!is_from_best_next_hop
) {
787 /* Mark the forwarded packet when it is not coming from our
788 * best next hop. We still need to forward the packet for our
789 * neighbor link quality detection to work in case the packet
790 * originated from a single hop neighbor. Otherwise we can
791 * simply drop the ogm.
793 if (is_single_hop_neigh
)
794 batadv_ogm_packet
->flags
|= BATADV_NOT_BEST_NEXT_HOP
;
799 tvlv_len
= ntohs(batadv_ogm_packet
->tvlv_len
);
801 batadv_ogm_packet
->ttl
--;
802 memcpy(batadv_ogm_packet
->prev_sender
, ethhdr
->h_source
, ETH_ALEN
);
804 /* apply hop penalty */
805 batadv_ogm_packet
->tq
= batadv_hop_penalty(batadv_ogm_packet
->tq
,
808 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
809 "Forwarding packet: tq: %i, ttl: %i\n",
810 batadv_ogm_packet
->tq
, batadv_ogm_packet
->ttl
);
812 /* switch of primaries first hop flag when forwarding */
813 batadv_ogm_packet
->flags
&= ~BATADV_PRIMARIES_FIRST_HOP
;
814 if (is_single_hop_neigh
)
815 batadv_ogm_packet
->flags
|= BATADV_DIRECTLINK
;
817 batadv_ogm_packet
->flags
&= ~BATADV_DIRECTLINK
;
819 batadv_iv_ogm_queue_add(bat_priv
, (unsigned char *)batadv_ogm_packet
,
820 BATADV_OGM_HLEN
+ tvlv_len
,
821 if_incoming
, 0, batadv_iv_ogm_fwd_send_time());
825 * batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for
826 * the given interface
827 * @hard_iface: the interface for which the windows have to be shifted
830 batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface
*hard_iface
)
832 struct batadv_priv
*bat_priv
= netdev_priv(hard_iface
->soft_iface
);
833 struct batadv_hashtable
*hash
= bat_priv
->orig_hash
;
834 struct hlist_head
*head
;
835 struct batadv_orig_node
*orig_node
;
842 for (i
= 0; i
< hash
->size
; i
++) {
843 head
= &hash
->table
[i
];
846 hlist_for_each_entry_rcu(orig_node
, head
, hash_entry
) {
847 spin_lock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
848 word_index
= hard_iface
->if_num
* BATADV_NUM_WORDS
;
849 word
= &(orig_node
->bat_iv
.bcast_own
[word_index
]);
851 batadv_bit_get_packet(bat_priv
, word
, 1, 0);
852 if_num
= hard_iface
->if_num
;
853 w
= &orig_node
->bat_iv
.bcast_own_sum
[if_num
];
854 *w
= bitmap_weight(word
, BATADV_TQ_LOCAL_WINDOW_SIZE
);
855 spin_unlock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
861 static void batadv_iv_ogm_schedule(struct batadv_hard_iface
*hard_iface
)
863 struct batadv_priv
*bat_priv
= netdev_priv(hard_iface
->soft_iface
);
864 unsigned char **ogm_buff
= &hard_iface
->bat_iv
.ogm_buff
;
865 struct batadv_ogm_packet
*batadv_ogm_packet
;
866 struct batadv_hard_iface
*primary_if
;
867 int *ogm_buff_len
= &hard_iface
->bat_iv
.ogm_buff_len
;
869 uint16_t tvlv_len
= 0;
871 primary_if
= batadv_primary_if_get_selected(bat_priv
);
873 if (hard_iface
== primary_if
) {
874 /* tt changes have to be committed before the tvlv data is
875 * appended as it may alter the tt tvlv container
877 batadv_tt_local_commit_changes(bat_priv
);
878 tvlv_len
= batadv_tvlv_container_ogm_append(bat_priv
, ogm_buff
,
883 batadv_ogm_packet
= (struct batadv_ogm_packet
*)(*ogm_buff
);
884 batadv_ogm_packet
->tvlv_len
= htons(tvlv_len
);
886 /* change sequence number to network order */
887 seqno
= (uint32_t)atomic_read(&hard_iface
->bat_iv
.ogm_seqno
);
888 batadv_ogm_packet
->seqno
= htonl(seqno
);
889 atomic_inc(&hard_iface
->bat_iv
.ogm_seqno
);
891 batadv_iv_ogm_slide_own_bcast_window(hard_iface
);
892 batadv_iv_ogm_queue_add(bat_priv
, hard_iface
->bat_iv
.ogm_buff
,
893 hard_iface
->bat_iv
.ogm_buff_len
, hard_iface
, 1,
894 batadv_iv_ogm_emit_send_time(bat_priv
));
897 batadv_hardif_free_ref(primary_if
);
901 batadv_iv_ogm_orig_update(struct batadv_priv
*bat_priv
,
902 struct batadv_orig_node
*orig_node
,
903 const struct ethhdr
*ethhdr
,
904 const struct batadv_ogm_packet
*batadv_ogm_packet
,
905 struct batadv_hard_iface
*if_incoming
,
906 const unsigned char *tt_buff
,
907 enum batadv_dup_status dup_status
)
909 struct batadv_neigh_node
*neigh_node
= NULL
, *tmp_neigh_node
= NULL
;
910 struct batadv_neigh_node
*router
= NULL
;
911 struct batadv_orig_node
*orig_node_tmp
;
913 uint8_t sum_orig
, sum_neigh
;
917 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
918 "update_originator(): Searching and updating originator entry of received packet\n");
921 hlist_for_each_entry_rcu(tmp_neigh_node
,
922 &orig_node
->neigh_list
, list
) {
923 neigh_addr
= tmp_neigh_node
->addr
;
924 if (batadv_compare_eth(neigh_addr
, ethhdr
->h_source
) &&
925 tmp_neigh_node
->if_incoming
== if_incoming
&&
926 atomic_inc_not_zero(&tmp_neigh_node
->refcount
)) {
927 if (WARN(neigh_node
, "too many matching neigh_nodes"))
928 batadv_neigh_node_free_ref(neigh_node
);
929 neigh_node
= tmp_neigh_node
;
933 if (dup_status
!= BATADV_NO_DUP
)
936 spin_lock_bh(&tmp_neigh_node
->bat_iv
.lq_update_lock
);
937 batadv_ring_buffer_set(tmp_neigh_node
->bat_iv
.tq_recv
,
938 &tmp_neigh_node
->bat_iv
.tq_index
, 0);
939 tq_avg
= batadv_ring_buffer_avg(tmp_neigh_node
->bat_iv
.tq_recv
);
940 tmp_neigh_node
->bat_iv
.tq_avg
= tq_avg
;
941 spin_unlock_bh(&tmp_neigh_node
->bat_iv
.lq_update_lock
);
945 struct batadv_orig_node
*orig_tmp
;
947 orig_tmp
= batadv_iv_ogm_orig_get(bat_priv
, ethhdr
->h_source
);
951 neigh_node
= batadv_iv_ogm_neigh_new(if_incoming
,
953 orig_node
, orig_tmp
);
955 batadv_orig_node_free_ref(orig_tmp
);
959 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
960 "Updating existing last-hop neighbor of originator\n");
964 neigh_node
->last_seen
= jiffies
;
966 spin_lock_bh(&neigh_node
->bat_iv
.lq_update_lock
);
967 batadv_ring_buffer_set(neigh_node
->bat_iv
.tq_recv
,
968 &neigh_node
->bat_iv
.tq_index
,
969 batadv_ogm_packet
->tq
);
970 tq_avg
= batadv_ring_buffer_avg(neigh_node
->bat_iv
.tq_recv
);
971 neigh_node
->bat_iv
.tq_avg
= tq_avg
;
972 spin_unlock_bh(&neigh_node
->bat_iv
.lq_update_lock
);
974 if (dup_status
== BATADV_NO_DUP
) {
975 orig_node
->last_ttl
= batadv_ogm_packet
->ttl
;
976 neigh_node
->last_ttl
= batadv_ogm_packet
->ttl
;
979 batadv_bonding_candidate_add(bat_priv
, orig_node
, neigh_node
);
981 /* if this neighbor already is our next hop there is nothing
984 router
= batadv_orig_node_get_router(orig_node
);
985 if (router
== neigh_node
)
988 /* if this neighbor does not offer a better TQ we won't consider it */
989 if (router
&& (router
->bat_iv
.tq_avg
> neigh_node
->bat_iv
.tq_avg
))
992 /* if the TQ is the same and the link not more symmetric we
993 * won't consider it either
995 if (router
&& (neigh_node
->bat_iv
.tq_avg
== router
->bat_iv
.tq_avg
)) {
996 orig_node_tmp
= router
->orig_node
;
997 spin_lock_bh(&orig_node_tmp
->bat_iv
.ogm_cnt_lock
);
998 if_num
= router
->if_incoming
->if_num
;
999 sum_orig
= orig_node_tmp
->bat_iv
.bcast_own_sum
[if_num
];
1000 spin_unlock_bh(&orig_node_tmp
->bat_iv
.ogm_cnt_lock
);
1002 orig_node_tmp
= neigh_node
->orig_node
;
1003 spin_lock_bh(&orig_node_tmp
->bat_iv
.ogm_cnt_lock
);
1004 if_num
= neigh_node
->if_incoming
->if_num
;
1005 sum_neigh
= orig_node_tmp
->bat_iv
.bcast_own_sum
[if_num
];
1006 spin_unlock_bh(&orig_node_tmp
->bat_iv
.ogm_cnt_lock
);
1008 if (sum_orig
>= sum_neigh
)
1012 batadv_update_route(bat_priv
, orig_node
, neigh_node
);
1019 batadv_neigh_node_free_ref(neigh_node
);
1021 batadv_neigh_node_free_ref(router
);
1024 static int batadv_iv_ogm_calc_tq(struct batadv_orig_node
*orig_node
,
1025 struct batadv_orig_node
*orig_neigh_node
,
1026 struct batadv_ogm_packet
*batadv_ogm_packet
,
1027 struct batadv_hard_iface
*if_incoming
)
1029 struct batadv_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
1030 struct batadv_neigh_node
*neigh_node
= NULL
, *tmp_neigh_node
;
1031 uint8_t total_count
;
1032 uint8_t orig_eq_count
, neigh_rq_count
, neigh_rq_inv
, tq_own
;
1033 unsigned int neigh_rq_inv_cube
, neigh_rq_max_cube
;
1034 int tq_asym_penalty
, inv_asym_penalty
, if_num
, ret
= 0;
1035 unsigned int combined_tq
;
1037 /* find corresponding one hop neighbor */
1039 hlist_for_each_entry_rcu(tmp_neigh_node
,
1040 &orig_neigh_node
->neigh_list
, list
) {
1041 if (!batadv_compare_eth(tmp_neigh_node
->addr
,
1042 orig_neigh_node
->orig
))
1045 if (tmp_neigh_node
->if_incoming
!= if_incoming
)
1048 if (!atomic_inc_not_zero(&tmp_neigh_node
->refcount
))
1051 neigh_node
= tmp_neigh_node
;
1057 neigh_node
= batadv_iv_ogm_neigh_new(if_incoming
,
1058 orig_neigh_node
->orig
,
1065 /* if orig_node is direct neighbor update neigh_node last_seen */
1066 if (orig_node
== orig_neigh_node
)
1067 neigh_node
->last_seen
= jiffies
;
1069 orig_node
->last_seen
= jiffies
;
1071 /* find packet count of corresponding one hop neighbor */
1072 spin_lock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
1073 if_num
= if_incoming
->if_num
;
1074 orig_eq_count
= orig_neigh_node
->bat_iv
.bcast_own_sum
[if_num
];
1075 neigh_rq_count
= neigh_node
->bat_iv
.real_packet_count
;
1076 spin_unlock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
1078 /* pay attention to not get a value bigger than 100 % */
1079 if (orig_eq_count
> neigh_rq_count
)
1080 total_count
= neigh_rq_count
;
1082 total_count
= orig_eq_count
;
1084 /* if we have too few packets (too less data) we set tq_own to zero
1085 * if we receive too few packets it is not considered bidirectional
1087 if (total_count
< BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM
||
1088 neigh_rq_count
< BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM
)
1091 /* neigh_node->real_packet_count is never zero as we
1092 * only purge old information when getting new
1095 tq_own
= (BATADV_TQ_MAX_VALUE
* total_count
) / neigh_rq_count
;
1097 /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
1098 * affect the nearly-symmetric links only a little, but
1099 * punishes asymmetric links more. This will give a value
1100 * between 0 and TQ_MAX_VALUE
1102 neigh_rq_inv
= BATADV_TQ_LOCAL_WINDOW_SIZE
- neigh_rq_count
;
1103 neigh_rq_inv_cube
= neigh_rq_inv
* neigh_rq_inv
* neigh_rq_inv
;
1104 neigh_rq_max_cube
= BATADV_TQ_LOCAL_WINDOW_SIZE
*
1105 BATADV_TQ_LOCAL_WINDOW_SIZE
*
1106 BATADV_TQ_LOCAL_WINDOW_SIZE
;
1107 inv_asym_penalty
= BATADV_TQ_MAX_VALUE
* neigh_rq_inv_cube
;
1108 inv_asym_penalty
/= neigh_rq_max_cube
;
1109 tq_asym_penalty
= BATADV_TQ_MAX_VALUE
- inv_asym_penalty
;
1111 combined_tq
= batadv_ogm_packet
->tq
* tq_own
* tq_asym_penalty
;
1112 combined_tq
/= BATADV_TQ_MAX_VALUE
* BATADV_TQ_MAX_VALUE
;
1113 batadv_ogm_packet
->tq
= combined_tq
;
1115 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1116 "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n",
1117 orig_node
->orig
, orig_neigh_node
->orig
, total_count
,
1118 neigh_rq_count
, tq_own
,
1119 tq_asym_penalty
, batadv_ogm_packet
->tq
);
1121 /* if link has the minimum required transmission quality
1122 * consider it bidirectional
1124 if (batadv_ogm_packet
->tq
>= BATADV_TQ_TOTAL_BIDRECT_LIMIT
)
1129 batadv_neigh_node_free_ref(neigh_node
);
1134 * batadv_iv_ogm_update_seqnos - process a batman packet for all interfaces,
1135 * adjust the sequence number and find out whether it is a duplicate
1136 * @ethhdr: ethernet header of the packet
1137 * @batadv_ogm_packet: OGM packet to be considered
1138 * @if_incoming: interface on which the OGM packet was received
1140 * Returns duplicate status as enum batadv_dup_status
1142 static enum batadv_dup_status
1143 batadv_iv_ogm_update_seqnos(const struct ethhdr
*ethhdr
,
1144 const struct batadv_ogm_packet
*batadv_ogm_packet
,
1145 const struct batadv_hard_iface
*if_incoming
)
1147 struct batadv_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
1148 struct batadv_orig_node
*orig_node
;
1149 struct batadv_neigh_node
*tmp_neigh_node
;
1152 int need_update
= 0;
1154 enum batadv_dup_status ret
= BATADV_NO_DUP
;
1155 uint32_t seqno
= ntohl(batadv_ogm_packet
->seqno
);
1156 uint8_t *neigh_addr
;
1157 uint8_t packet_count
;
1158 unsigned long *bitmap
;
1160 orig_node
= batadv_iv_ogm_orig_get(bat_priv
, batadv_ogm_packet
->orig
);
1162 return BATADV_NO_DUP
;
1164 spin_lock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
1165 seq_diff
= seqno
- orig_node
->last_real_seqno
;
1167 /* signalize caller that the packet is to be dropped. */
1168 if (!hlist_empty(&orig_node
->neigh_list
) &&
1169 batadv_window_protected(bat_priv
, seq_diff
,
1170 &orig_node
->batman_seqno_reset
)) {
1171 ret
= BATADV_PROTECTED
;
1176 hlist_for_each_entry_rcu(tmp_neigh_node
,
1177 &orig_node
->neigh_list
, list
) {
1178 neigh_addr
= tmp_neigh_node
->addr
;
1179 is_dup
= batadv_test_bit(tmp_neigh_node
->bat_iv
.real_bits
,
1180 orig_node
->last_real_seqno
,
1183 if (batadv_compare_eth(neigh_addr
, ethhdr
->h_source
) &&
1184 tmp_neigh_node
->if_incoming
== if_incoming
) {
1187 ret
= BATADV_NEIGH_DUP
;
1190 if (is_dup
&& (ret
!= BATADV_NEIGH_DUP
))
1191 ret
= BATADV_ORIG_DUP
;
1194 /* if the window moved, set the update flag. */
1195 bitmap
= tmp_neigh_node
->bat_iv
.real_bits
;
1196 need_update
|= batadv_bit_get_packet(bat_priv
, bitmap
,
1197 seq_diff
, set_mark
);
1199 packet_count
= bitmap_weight(tmp_neigh_node
->bat_iv
.real_bits
,
1200 BATADV_TQ_LOCAL_WINDOW_SIZE
);
1201 tmp_neigh_node
->bat_iv
.real_packet_count
= packet_count
;
1206 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1207 "updating last_seqno: old %u, new %u\n",
1208 orig_node
->last_real_seqno
, seqno
);
1209 orig_node
->last_real_seqno
= seqno
;
1213 spin_unlock_bh(&orig_node
->bat_iv
.ogm_cnt_lock
);
1214 batadv_orig_node_free_ref(orig_node
);
1218 static void batadv_iv_ogm_process(const struct ethhdr
*ethhdr
,
1219 struct batadv_ogm_packet
*batadv_ogm_packet
,
1220 const unsigned char *tt_buff
,
1221 struct batadv_hard_iface
*if_incoming
)
1223 struct batadv_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
1224 struct batadv_hard_iface
*hard_iface
;
1225 struct batadv_orig_node
*orig_neigh_node
, *orig_node
, *orig_node_tmp
;
1226 struct batadv_neigh_node
*router
= NULL
, *router_router
= NULL
;
1227 struct batadv_neigh_node
*orig_neigh_router
= NULL
;
1228 int has_directlink_flag
;
1229 int is_my_addr
= 0, is_my_orig
= 0, is_my_oldorig
= 0;
1231 bool is_single_hop_neigh
= false;
1232 bool is_from_best_next_hop
= false;
1233 int sameseq
, similar_ttl
;
1234 enum batadv_dup_status dup_status
;
1235 uint32_t if_incoming_seqno
;
1236 uint8_t *prev_sender
;
1238 /* Silently drop when the batman packet is actually not a
1241 * This might happen if a packet is padded (e.g. Ethernet has a
1242 * minimum frame length of 64 byte) and the aggregation interprets
1243 * it as an additional length.
1245 * TODO: A more sane solution would be to have a bit in the
1246 * batadv_ogm_packet to detect whether the packet is the last
1247 * packet in an aggregation. Here we expect that the padding
1248 * is always zero (or not 0x01)
1250 if (batadv_ogm_packet
->packet_type
!= BATADV_IV_OGM
)
1253 /* could be changed by schedule_own_packet() */
1254 if_incoming_seqno
= atomic_read(&if_incoming
->bat_iv
.ogm_seqno
);
1256 if (batadv_ogm_packet
->flags
& BATADV_DIRECTLINK
)
1257 has_directlink_flag
= 1;
1259 has_directlink_flag
= 0;
1261 if (batadv_compare_eth(ethhdr
->h_source
, batadv_ogm_packet
->orig
))
1262 is_single_hop_neigh
= true;
1264 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1265 "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",
1266 ethhdr
->h_source
, if_incoming
->net_dev
->name
,
1267 if_incoming
->net_dev
->dev_addr
, batadv_ogm_packet
->orig
,
1268 batadv_ogm_packet
->prev_sender
,
1269 ntohl(batadv_ogm_packet
->seqno
), batadv_ogm_packet
->tq
,
1270 batadv_ogm_packet
->ttl
,
1271 batadv_ogm_packet
->version
, has_directlink_flag
);
1274 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
1275 if (hard_iface
->if_status
!= BATADV_IF_ACTIVE
)
1278 if (hard_iface
->soft_iface
!= if_incoming
->soft_iface
)
1281 if (batadv_compare_eth(ethhdr
->h_source
,
1282 hard_iface
->net_dev
->dev_addr
))
1285 if (batadv_compare_eth(batadv_ogm_packet
->orig
,
1286 hard_iface
->net_dev
->dev_addr
))
1289 if (batadv_compare_eth(batadv_ogm_packet
->prev_sender
,
1290 hard_iface
->net_dev
->dev_addr
))
1296 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1297 "Drop packet: received my own broadcast (sender: %pM)\n",
1303 unsigned long *word
;
1309 orig_neigh_node
= batadv_iv_ogm_orig_get(bat_priv
,
1311 if (!orig_neigh_node
)
1314 /* neighbor has to indicate direct link and it has to
1315 * come via the corresponding interface
1316 * save packet seqno for bidirectional check
1318 if (has_directlink_flag
&&
1319 batadv_compare_eth(if_incoming
->net_dev
->dev_addr
,
1320 batadv_ogm_packet
->orig
)) {
1321 if_num
= if_incoming
->if_num
;
1322 offset
= if_num
* BATADV_NUM_WORDS
;
1324 spin_lock_bh(&orig_neigh_node
->bat_iv
.ogm_cnt_lock
);
1325 word
= &(orig_neigh_node
->bat_iv
.bcast_own
[offset
]);
1326 bit_pos
= if_incoming_seqno
- 2;
1327 bit_pos
-= ntohl(batadv_ogm_packet
->seqno
);
1328 batadv_set_bit(word
, bit_pos
);
1329 weight
= &orig_neigh_node
->bat_iv
.bcast_own_sum
[if_num
];
1330 *weight
= bitmap_weight(word
,
1331 BATADV_TQ_LOCAL_WINDOW_SIZE
);
1332 spin_unlock_bh(&orig_neigh_node
->bat_iv
.ogm_cnt_lock
);
1335 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1336 "Drop packet: originator packet from myself (via neighbor)\n");
1337 batadv_orig_node_free_ref(orig_neigh_node
);
1341 if (is_my_oldorig
) {
1342 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1343 "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1348 if (batadv_ogm_packet
->flags
& BATADV_NOT_BEST_NEXT_HOP
) {
1349 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1350 "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1355 orig_node
= batadv_iv_ogm_orig_get(bat_priv
, batadv_ogm_packet
->orig
);
1359 dup_status
= batadv_iv_ogm_update_seqnos(ethhdr
, batadv_ogm_packet
,
1362 if (dup_status
== BATADV_PROTECTED
) {
1363 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1364 "Drop packet: packet within seqno protection time (sender: %pM)\n",
1369 if (batadv_ogm_packet
->tq
== 0) {
1370 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1371 "Drop packet: originator packet with tq equal 0\n");
1375 router
= batadv_orig_node_get_router(orig_node
);
1377 orig_node_tmp
= router
->orig_node
;
1378 router_router
= batadv_orig_node_get_router(orig_node_tmp
);
1381 if ((router
&& router
->bat_iv
.tq_avg
!= 0) &&
1382 (batadv_compare_eth(router
->addr
, ethhdr
->h_source
)))
1383 is_from_best_next_hop
= true;
1385 prev_sender
= batadv_ogm_packet
->prev_sender
;
1386 /* avoid temporary routing loops */
1387 if (router
&& router_router
&&
1388 (batadv_compare_eth(router
->addr
, prev_sender
)) &&
1389 !(batadv_compare_eth(batadv_ogm_packet
->orig
, prev_sender
)) &&
1390 (batadv_compare_eth(router
->addr
, router_router
->addr
))) {
1391 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1392 "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1397 batadv_tvlv_ogm_receive(bat_priv
, batadv_ogm_packet
, orig_node
);
1399 /* if sender is a direct neighbor the sender mac equals
1402 if (is_single_hop_neigh
)
1403 orig_neigh_node
= orig_node
;
1405 orig_neigh_node
= batadv_iv_ogm_orig_get(bat_priv
,
1408 if (!orig_neigh_node
)
1411 /* Update nc_nodes of the originator */
1412 batadv_nc_update_nc_node(bat_priv
, orig_node
, orig_neigh_node
,
1413 batadv_ogm_packet
, is_single_hop_neigh
);
1415 orig_neigh_router
= batadv_orig_node_get_router(orig_neigh_node
);
1417 /* drop packet if sender is not a direct neighbor and if we
1418 * don't route towards it
1420 if (!is_single_hop_neigh
&& (!orig_neigh_router
)) {
1421 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1422 "Drop packet: OGM via unknown neighbor!\n");
1426 is_bidirect
= batadv_iv_ogm_calc_tq(orig_node
, orig_neigh_node
,
1427 batadv_ogm_packet
, if_incoming
);
1429 batadv_bonding_save_primary(orig_node
, orig_neigh_node
,
1432 /* update ranking if it is not a duplicate or has the same
1433 * seqno and similar ttl as the non-duplicate
1435 sameseq
= orig_node
->last_real_seqno
== ntohl(batadv_ogm_packet
->seqno
);
1436 similar_ttl
= orig_node
->last_ttl
- 3 <= batadv_ogm_packet
->ttl
;
1437 if (is_bidirect
&& ((dup_status
== BATADV_NO_DUP
) ||
1438 (sameseq
&& similar_ttl
)))
1439 batadv_iv_ogm_orig_update(bat_priv
, orig_node
, ethhdr
,
1440 batadv_ogm_packet
, if_incoming
,
1441 tt_buff
, dup_status
);
1443 /* is single hop (direct) neighbor */
1444 if (is_single_hop_neigh
) {
1445 /* mark direct link on incoming interface */
1446 batadv_iv_ogm_forward(orig_node
, ethhdr
, batadv_ogm_packet
,
1447 is_single_hop_neigh
,
1448 is_from_best_next_hop
, if_incoming
);
1450 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1451 "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1455 /* multihop originator */
1457 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1458 "Drop packet: not received via bidirectional link\n");
1462 if (dup_status
== BATADV_NEIGH_DUP
) {
1463 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1464 "Drop packet: duplicate packet received\n");
1468 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1469 "Forwarding packet: rebroadcast originator packet\n");
1470 batadv_iv_ogm_forward(orig_node
, ethhdr
, batadv_ogm_packet
,
1471 is_single_hop_neigh
, is_from_best_next_hop
,
1475 if ((orig_neigh_node
) && (!is_single_hop_neigh
))
1476 batadv_orig_node_free_ref(orig_neigh_node
);
1479 batadv_neigh_node_free_ref(router
);
1481 batadv_neigh_node_free_ref(router_router
);
1482 if (orig_neigh_router
)
1483 batadv_neigh_node_free_ref(orig_neigh_router
);
1485 batadv_orig_node_free_ref(orig_node
);
1488 static int batadv_iv_ogm_receive(struct sk_buff
*skb
,
1489 struct batadv_hard_iface
*if_incoming
)
1491 struct batadv_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
1492 struct batadv_ogm_packet
*batadv_ogm_packet
;
1493 struct ethhdr
*ethhdr
;
1494 int buff_pos
= 0, packet_len
;
1495 unsigned char *tvlv_buff
, *packet_buff
;
1496 uint8_t *packet_pos
;
1499 ret
= batadv_check_management_packet(skb
, if_incoming
, BATADV_OGM_HLEN
);
1503 /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1504 * that does not have B.A.T.M.A.N. IV enabled ?
1506 if (bat_priv
->bat_algo_ops
->bat_ogm_emit
!= batadv_iv_ogm_emit
)
1509 batadv_inc_counter(bat_priv
, BATADV_CNT_MGMT_RX
);
1510 batadv_add_counter(bat_priv
, BATADV_CNT_MGMT_RX_BYTES
,
1511 skb
->len
+ ETH_HLEN
);
1513 packet_len
= skb_headlen(skb
);
1514 ethhdr
= eth_hdr(skb
);
1515 packet_buff
= skb
->data
;
1516 batadv_ogm_packet
= (struct batadv_ogm_packet
*)packet_buff
;
1518 /* unpack the aggregated packets and process them one by one */
1519 while (batadv_iv_ogm_aggr_packet(buff_pos
, packet_len
,
1520 batadv_ogm_packet
->tvlv_len
)) {
1521 tvlv_buff
= packet_buff
+ buff_pos
+ BATADV_OGM_HLEN
;
1523 batadv_iv_ogm_process(ethhdr
, batadv_ogm_packet
,
1524 tvlv_buff
, if_incoming
);
1526 buff_pos
+= BATADV_OGM_HLEN
;
1527 buff_pos
+= ntohs(batadv_ogm_packet
->tvlv_len
);
1529 packet_pos
= packet_buff
+ buff_pos
;
1530 batadv_ogm_packet
= (struct batadv_ogm_packet
*)packet_pos
;
1534 return NET_RX_SUCCESS
;
1538 * batadv_iv_ogm_orig_print - print the originator table
1539 * @bat_priv: the bat priv with all the soft interface information
1540 * @seq: debugfs table seq_file struct
1542 static void batadv_iv_ogm_orig_print(struct batadv_priv
*bat_priv
,
1543 struct seq_file
*seq
)
1545 struct batadv_neigh_node
*neigh_node
, *neigh_node_tmp
;
1546 struct batadv_hashtable
*hash
= bat_priv
->orig_hash
;
1547 int last_seen_msecs
, last_seen_secs
;
1548 struct batadv_orig_node
*orig_node
;
1549 unsigned long last_seen_jiffies
;
1550 struct hlist_head
*head
;
1551 int batman_count
= 0;
1554 seq_printf(seq
, " %-15s %s (%s/%i) %17s [%10s]: %20s ...\n",
1555 "Originator", "last-seen", "#", BATADV_TQ_MAX_VALUE
,
1556 "Nexthop", "outgoingIF", "Potential nexthops");
1558 for (i
= 0; i
< hash
->size
; i
++) {
1559 head
= &hash
->table
[i
];
1562 hlist_for_each_entry_rcu(orig_node
, head
, hash_entry
) {
1563 neigh_node
= batadv_orig_node_get_router(orig_node
);
1567 if (neigh_node
->bat_iv
.tq_avg
== 0)
1570 last_seen_jiffies
= jiffies
- orig_node
->last_seen
;
1571 last_seen_msecs
= jiffies_to_msecs(last_seen_jiffies
);
1572 last_seen_secs
= last_seen_msecs
/ 1000;
1573 last_seen_msecs
= last_seen_msecs
% 1000;
1575 seq_printf(seq
, "%pM %4i.%03is (%3i) %pM [%10s]:",
1576 orig_node
->orig
, last_seen_secs
,
1577 last_seen_msecs
, neigh_node
->bat_iv
.tq_avg
,
1579 neigh_node
->if_incoming
->net_dev
->name
);
1581 hlist_for_each_entry_rcu(neigh_node_tmp
,
1582 &orig_node
->neigh_list
, list
) {
1583 seq_printf(seq
, " %pM (%3i)",
1584 neigh_node_tmp
->addr
,
1585 neigh_node_tmp
->bat_iv
.tq_avg
);
1588 seq_puts(seq
, "\n");
1592 batadv_neigh_node_free_ref(neigh_node
);
1597 if (batman_count
== 0)
1598 seq_puts(seq
, "No batman nodes in range ...\n");
1602 * batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors
1603 * @neigh1: the first neighbor object of the comparison
1604 * @neigh2: the second neighbor object of the comparison
1606 * Returns a value less, equal to or greater than 0 if the metric via neigh1 is
1607 * lower, the same as or higher than the metric via neigh2
1609 static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node
*neigh1
,
1610 struct batadv_neigh_node
*neigh2
)
1614 tq1
= neigh1
->bat_iv
.tq_avg
;
1615 tq2
= neigh2
->bat_iv
.tq_avg
;
1621 * batadv_iv_ogm_neigh_is_eob - check if neigh1 is equally good or better than
1622 * neigh2 from the metric prospective
1623 * @neigh1: the first neighbor object of the comparison
1624 * @neigh2: the second neighbor object of the comparison
1626 * Returns true if the metric via neigh1 is equally good or better than the
1627 * metric via neigh2, false otherwise.
1629 static bool batadv_iv_ogm_neigh_is_eob(struct batadv_neigh_node
*neigh1
,
1630 struct batadv_neigh_node
*neigh2
)
1632 int diff
= batadv_iv_ogm_neigh_cmp(neigh1
, neigh2
);
1634 return diff
> -BATADV_TQ_SIMILARITY_THRESHOLD
;
1637 static struct batadv_algo_ops batadv_batman_iv __read_mostly
= {
1638 .name
= "BATMAN_IV",
1639 .bat_iface_enable
= batadv_iv_ogm_iface_enable
,
1640 .bat_iface_disable
= batadv_iv_ogm_iface_disable
,
1641 .bat_iface_update_mac
= batadv_iv_ogm_iface_update_mac
,
1642 .bat_primary_iface_set
= batadv_iv_ogm_primary_iface_set
,
1643 .bat_ogm_schedule
= batadv_iv_ogm_schedule
,
1644 .bat_ogm_emit
= batadv_iv_ogm_emit
,
1645 .bat_neigh_cmp
= batadv_iv_ogm_neigh_cmp
,
1646 .bat_neigh_is_equiv_or_better
= batadv_iv_ogm_neigh_is_eob
,
1647 .bat_orig_print
= batadv_iv_ogm_orig_print
,
1648 .bat_orig_free
= batadv_iv_ogm_orig_free
,
1649 .bat_orig_add_if
= batadv_iv_ogm_orig_add_if
,
1650 .bat_orig_del_if
= batadv_iv_ogm_orig_del_if
,
1653 int __init
batadv_iv_init(void)
1657 /* batman originator packet */
1658 ret
= batadv_recv_handler_register(BATADV_IV_OGM
,
1659 batadv_iv_ogm_receive
);
1663 ret
= batadv_algo_register(&batadv_batman_iv
);
1665 goto handler_unregister
;
1670 batadv_recv_handler_unregister(BATADV_IV_OGM
);