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 "ring_buffer.h"
23 #include "originator.h"
25 #include "gateway_common.h"
26 #include "gateway_client.h"
27 #include "hard-interface.h"
30 #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
{
47 static struct batadv_neigh_node
*
48 batadv_iv_ogm_neigh_new(struct batadv_hard_iface
*hard_iface
,
49 const uint8_t *neigh_addr
,
50 struct batadv_orig_node
*orig_node
,
51 struct batadv_orig_node
*orig_neigh
, __be32 seqno
)
53 struct batadv_neigh_node
*neigh_node
;
55 neigh_node
= batadv_neigh_node_new(hard_iface
, neigh_addr
,
60 INIT_LIST_HEAD(&neigh_node
->bonding_list
);
62 neigh_node
->orig_node
= orig_neigh
;
63 neigh_node
->if_incoming
= hard_iface
;
65 spin_lock_bh(&orig_node
->neigh_list_lock
);
66 hlist_add_head_rcu(&neigh_node
->list
, &orig_node
->neigh_list
);
67 spin_unlock_bh(&orig_node
->neigh_list_lock
);
73 static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface
*hard_iface
)
75 struct batadv_ogm_packet
*batadv_ogm_packet
;
76 unsigned char *ogm_buff
;
77 uint32_t random_seqno
;
80 /* randomize initial seqno to avoid collision */
81 get_random_bytes(&random_seqno
, sizeof(random_seqno
));
82 atomic_set(&hard_iface
->bat_iv
.ogm_seqno
, random_seqno
);
84 hard_iface
->bat_iv
.ogm_buff_len
= BATADV_OGM_HLEN
;
85 ogm_buff
= kmalloc(hard_iface
->bat_iv
.ogm_buff_len
, GFP_ATOMIC
);
89 hard_iface
->bat_iv
.ogm_buff
= ogm_buff
;
91 batadv_ogm_packet
= (struct batadv_ogm_packet
*)ogm_buff
;
92 batadv_ogm_packet
->header
.packet_type
= BATADV_IV_OGM
;
93 batadv_ogm_packet
->header
.version
= BATADV_COMPAT_VERSION
;
94 batadv_ogm_packet
->header
.ttl
= 2;
95 batadv_ogm_packet
->flags
= BATADV_NO_FLAGS
;
96 batadv_ogm_packet
->tq
= BATADV_TQ_MAX_VALUE
;
97 batadv_ogm_packet
->tt_num_changes
= 0;
98 batadv_ogm_packet
->ttvn
= 0;
106 static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface
*hard_iface
)
108 kfree(hard_iface
->bat_iv
.ogm_buff
);
109 hard_iface
->bat_iv
.ogm_buff
= NULL
;
112 static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface
*hard_iface
)
114 struct batadv_ogm_packet
*batadv_ogm_packet
;
115 unsigned char *ogm_buff
= hard_iface
->bat_iv
.ogm_buff
;
117 batadv_ogm_packet
= (struct batadv_ogm_packet
*)ogm_buff
;
118 memcpy(batadv_ogm_packet
->orig
,
119 hard_iface
->net_dev
->dev_addr
, ETH_ALEN
);
120 memcpy(batadv_ogm_packet
->prev_sender
,
121 hard_iface
->net_dev
->dev_addr
, ETH_ALEN
);
125 batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface
*hard_iface
)
127 struct batadv_ogm_packet
*batadv_ogm_packet
;
128 unsigned char *ogm_buff
= hard_iface
->bat_iv
.ogm_buff
;
130 batadv_ogm_packet
= (struct batadv_ogm_packet
*)ogm_buff
;
131 batadv_ogm_packet
->flags
= BATADV_PRIMARIES_FIRST_HOP
;
132 batadv_ogm_packet
->header
.ttl
= BATADV_TTL
;
135 /* when do we schedule our own ogm to be sent */
137 batadv_iv_ogm_emit_send_time(const struct batadv_priv
*bat_priv
)
141 msecs
= atomic_read(&bat_priv
->orig_interval
) - BATADV_JITTER
;
142 msecs
+= prandom_u32() % (2 * BATADV_JITTER
);
144 return jiffies
+ msecs_to_jiffies(msecs
);
147 /* when do we schedule a ogm packet to be sent */
148 static unsigned long batadv_iv_ogm_fwd_send_time(void)
150 return jiffies
+ msecs_to_jiffies(prandom_u32() % (BATADV_JITTER
/ 2));
153 /* apply hop penalty for a normal link */
154 static uint8_t batadv_hop_penalty(uint8_t tq
,
155 const struct batadv_priv
*bat_priv
)
157 int hop_penalty
= atomic_read(&bat_priv
->hop_penalty
);
160 new_tq
= tq
* (BATADV_TQ_MAX_VALUE
- hop_penalty
);
161 new_tq
/= BATADV_TQ_MAX_VALUE
;
166 /* is there another aggregated packet here? */
167 static int batadv_iv_ogm_aggr_packet(int buff_pos
, int packet_len
,
170 int next_buff_pos
= 0;
172 next_buff_pos
+= buff_pos
+ BATADV_OGM_HLEN
;
173 next_buff_pos
+= batadv_tt_len(tt_num_changes
);
175 return (next_buff_pos
<= packet_len
) &&
176 (next_buff_pos
<= BATADV_MAX_AGGREGATION_BYTES
);
179 /* send a batman ogm to a given interface */
180 static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet
*forw_packet
,
181 struct batadv_hard_iface
*hard_iface
)
183 struct batadv_priv
*bat_priv
= netdev_priv(hard_iface
->soft_iface
);
187 struct batadv_ogm_packet
*batadv_ogm_packet
;
191 if (hard_iface
->if_status
!= BATADV_IF_ACTIVE
)
196 packet_pos
= forw_packet
->skb
->data
;
197 batadv_ogm_packet
= (struct batadv_ogm_packet
*)packet_pos
;
199 /* adjust all flags and log packets */
200 while (batadv_iv_ogm_aggr_packet(buff_pos
, forw_packet
->packet_len
,
201 batadv_ogm_packet
->tt_num_changes
)) {
202 /* we might have aggregated direct link packets with an
203 * ordinary base packet
205 if (forw_packet
->direct_link_flags
& BIT(packet_num
) &&
206 forw_packet
->if_incoming
== hard_iface
)
207 batadv_ogm_packet
->flags
|= BATADV_DIRECTLINK
;
209 batadv_ogm_packet
->flags
&= ~BATADV_DIRECTLINK
;
211 if (packet_num
> 0 || !forw_packet
->own
)
212 fwd_str
= "Forwarding";
214 fwd_str
= "Sending own";
216 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
217 "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n",
218 fwd_str
, (packet_num
> 0 ? "aggregated " : ""),
219 batadv_ogm_packet
->orig
,
220 ntohl(batadv_ogm_packet
->seqno
),
221 batadv_ogm_packet
->tq
, batadv_ogm_packet
->header
.ttl
,
222 (batadv_ogm_packet
->flags
& BATADV_DIRECTLINK
?
224 batadv_ogm_packet
->ttvn
, hard_iface
->net_dev
->name
,
225 hard_iface
->net_dev
->dev_addr
);
227 buff_pos
+= BATADV_OGM_HLEN
;
228 buff_pos
+= batadv_tt_len(batadv_ogm_packet
->tt_num_changes
);
230 packet_pos
= forw_packet
->skb
->data
+ buff_pos
;
231 batadv_ogm_packet
= (struct batadv_ogm_packet
*)packet_pos
;
234 /* create clone because function is called more than once */
235 skb
= skb_clone(forw_packet
->skb
, GFP_ATOMIC
);
237 batadv_inc_counter(bat_priv
, BATADV_CNT_MGMT_TX
);
238 batadv_add_counter(bat_priv
, BATADV_CNT_MGMT_TX_BYTES
,
239 skb
->len
+ ETH_HLEN
);
240 batadv_send_skb_packet(skb
, hard_iface
, batadv_broadcast_addr
);
244 /* send a batman ogm packet */
245 static void batadv_iv_ogm_emit(struct batadv_forw_packet
*forw_packet
)
247 struct batadv_hard_iface
*hard_iface
;
248 struct net_device
*soft_iface
;
249 struct batadv_priv
*bat_priv
;
250 struct batadv_hard_iface
*primary_if
= NULL
;
251 struct batadv_ogm_packet
*batadv_ogm_packet
;
252 unsigned char directlink
;
255 packet_pos
= forw_packet
->skb
->data
;
256 batadv_ogm_packet
= (struct batadv_ogm_packet
*)packet_pos
;
257 directlink
= (batadv_ogm_packet
->flags
& BATADV_DIRECTLINK
? 1 : 0);
259 if (!forw_packet
->if_incoming
) {
260 pr_err("Error - can't forward packet: incoming iface not specified\n");
264 soft_iface
= forw_packet
->if_incoming
->soft_iface
;
265 bat_priv
= netdev_priv(soft_iface
);
267 if (forw_packet
->if_incoming
->if_status
!= BATADV_IF_ACTIVE
)
270 primary_if
= batadv_primary_if_get_selected(bat_priv
);
274 /* multihomed peer assumed
275 * non-primary OGMs are only broadcasted on their interface
277 if ((directlink
&& (batadv_ogm_packet
->header
.ttl
== 1)) ||
278 (forw_packet
->own
&& (forw_packet
->if_incoming
!= primary_if
))) {
279 /* FIXME: what about aggregated packets ? */
280 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
281 "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n",
282 (forw_packet
->own
? "Sending own" : "Forwarding"),
283 batadv_ogm_packet
->orig
,
284 ntohl(batadv_ogm_packet
->seqno
),
285 batadv_ogm_packet
->header
.ttl
,
286 forw_packet
->if_incoming
->net_dev
->name
,
287 forw_packet
->if_incoming
->net_dev
->dev_addr
);
289 /* skb is only used once and than forw_packet is free'd */
290 batadv_send_skb_packet(forw_packet
->skb
,
291 forw_packet
->if_incoming
,
292 batadv_broadcast_addr
);
293 forw_packet
->skb
= NULL
;
298 /* broadcast on every interface */
300 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
301 if (hard_iface
->soft_iface
!= soft_iface
)
304 batadv_iv_ogm_send_to_if(forw_packet
, hard_iface
);
310 batadv_hardif_free_ref(primary_if
);
313 /* return true if new_packet can be aggregated with forw_packet */
315 batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet
*new_bat_ogm_packet
,
316 struct batadv_priv
*bat_priv
,
317 int packet_len
, unsigned long send_time
,
319 const struct batadv_hard_iface
*if_incoming
,
320 const struct batadv_forw_packet
*forw_packet
)
322 struct batadv_ogm_packet
*batadv_ogm_packet
;
323 int aggregated_bytes
= forw_packet
->packet_len
+ packet_len
;
324 struct batadv_hard_iface
*primary_if
= NULL
;
326 unsigned long aggregation_end_time
;
328 batadv_ogm_packet
= (struct batadv_ogm_packet
*)forw_packet
->skb
->data
;
329 aggregation_end_time
= send_time
;
330 aggregation_end_time
+= msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS
);
332 /* we can aggregate the current packet to this aggregated packet
335 * - the send time is within our MAX_AGGREGATION_MS time
336 * - the resulting packet wont be bigger than
337 * MAX_AGGREGATION_BYTES
339 if (time_before(send_time
, forw_packet
->send_time
) &&
340 time_after_eq(aggregation_end_time
, forw_packet
->send_time
) &&
341 (aggregated_bytes
<= BATADV_MAX_AGGREGATION_BYTES
)) {
342 /* check aggregation compatibility
343 * -> direct link packets are broadcasted on
344 * their interface only
345 * -> aggregate packet if the current packet is
346 * a "global" packet as well as the base
349 primary_if
= batadv_primary_if_get_selected(bat_priv
);
353 /* packets without direct link flag and high TTL
354 * are flooded through the net
357 (!(batadv_ogm_packet
->flags
& BATADV_DIRECTLINK
)) &&
358 (batadv_ogm_packet
->header
.ttl
!= 1) &&
360 /* own packets originating non-primary
361 * interfaces leave only that interface
363 ((!forw_packet
->own
) ||
364 (forw_packet
->if_incoming
== primary_if
))) {
369 /* if the incoming packet is sent via this one
370 * interface only - we still can aggregate
373 (new_bat_ogm_packet
->header
.ttl
== 1) &&
374 (forw_packet
->if_incoming
== if_incoming
) &&
376 /* packets from direct neighbors or
377 * own secondary interface packets
378 * (= secondary interface packets in general)
380 (batadv_ogm_packet
->flags
& BATADV_DIRECTLINK
||
382 forw_packet
->if_incoming
!= primary_if
))) {
390 batadv_hardif_free_ref(primary_if
);
394 /* create a new aggregated packet and add this packet to it */
395 static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff
,
396 int packet_len
, unsigned long send_time
,
398 struct batadv_hard_iface
*if_incoming
,
401 struct batadv_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
402 struct batadv_forw_packet
*forw_packet_aggr
;
403 unsigned char *skb_buff
;
404 unsigned int skb_size
;
406 if (!atomic_inc_not_zero(&if_incoming
->refcount
))
409 /* own packet should always be scheduled */
411 if (!batadv_atomic_dec_not_zero(&bat_priv
->batman_queue_left
)) {
412 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
413 "batman packet queue full\n");
418 forw_packet_aggr
= kmalloc(sizeof(*forw_packet_aggr
), GFP_ATOMIC
);
419 if (!forw_packet_aggr
) {
421 atomic_inc(&bat_priv
->batman_queue_left
);
425 if ((atomic_read(&bat_priv
->aggregated_ogms
)) &&
426 (packet_len
< BATADV_MAX_AGGREGATION_BYTES
))
427 skb_size
= BATADV_MAX_AGGREGATION_BYTES
;
429 skb_size
= packet_len
;
431 skb_size
+= ETH_HLEN
+ NET_IP_ALIGN
;
433 forw_packet_aggr
->skb
= dev_alloc_skb(skb_size
);
434 if (!forw_packet_aggr
->skb
) {
436 atomic_inc(&bat_priv
->batman_queue_left
);
437 kfree(forw_packet_aggr
);
440 skb_reserve(forw_packet_aggr
->skb
, ETH_HLEN
+ NET_IP_ALIGN
);
442 INIT_HLIST_NODE(&forw_packet_aggr
->list
);
444 skb_buff
= skb_put(forw_packet_aggr
->skb
, packet_len
);
445 forw_packet_aggr
->packet_len
= packet_len
;
446 memcpy(skb_buff
, packet_buff
, packet_len
);
448 forw_packet_aggr
->own
= own_packet
;
449 forw_packet_aggr
->if_incoming
= if_incoming
;
450 forw_packet_aggr
->num_packets
= 0;
451 forw_packet_aggr
->direct_link_flags
= BATADV_NO_FLAGS
;
452 forw_packet_aggr
->send_time
= send_time
;
454 /* save packet direct link flag status */
456 forw_packet_aggr
->direct_link_flags
|= 1;
458 /* add new packet to packet list */
459 spin_lock_bh(&bat_priv
->forw_bat_list_lock
);
460 hlist_add_head(&forw_packet_aggr
->list
, &bat_priv
->forw_bat_list
);
461 spin_unlock_bh(&bat_priv
->forw_bat_list_lock
);
463 /* start timer for this packet */
464 INIT_DELAYED_WORK(&forw_packet_aggr
->delayed_work
,
465 batadv_send_outstanding_bat_ogm_packet
);
466 queue_delayed_work(batadv_event_workqueue
,
467 &forw_packet_aggr
->delayed_work
,
468 send_time
- jiffies
);
472 batadv_hardif_free_ref(if_incoming
);
475 /* aggregate a new packet into the existing ogm packet */
476 static void batadv_iv_ogm_aggregate(struct batadv_forw_packet
*forw_packet_aggr
,
477 const unsigned char *packet_buff
,
478 int packet_len
, bool direct_link
)
480 unsigned char *skb_buff
;
481 unsigned long new_direct_link_flag
;
483 skb_buff
= skb_put(forw_packet_aggr
->skb
, packet_len
);
484 memcpy(skb_buff
, packet_buff
, packet_len
);
485 forw_packet_aggr
->packet_len
+= packet_len
;
486 forw_packet_aggr
->num_packets
++;
488 /* save packet direct link flag status */
490 new_direct_link_flag
= BIT(forw_packet_aggr
->num_packets
);
491 forw_packet_aggr
->direct_link_flags
|= new_direct_link_flag
;
495 static void batadv_iv_ogm_queue_add(struct batadv_priv
*bat_priv
,
496 unsigned char *packet_buff
,
498 struct batadv_hard_iface
*if_incoming
,
499 int own_packet
, unsigned long send_time
)
501 /* _aggr -> pointer to the packet we want to aggregate with
502 * _pos -> pointer to the position in the queue
504 struct batadv_forw_packet
*forw_packet_aggr
= NULL
;
505 struct batadv_forw_packet
*forw_packet_pos
= NULL
;
506 struct batadv_ogm_packet
*batadv_ogm_packet
;
508 unsigned long max_aggregation_jiffies
;
510 batadv_ogm_packet
= (struct batadv_ogm_packet
*)packet_buff
;
511 direct_link
= batadv_ogm_packet
->flags
& BATADV_DIRECTLINK
? 1 : 0;
512 max_aggregation_jiffies
= msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS
);
514 /* find position for the packet in the forward queue */
515 spin_lock_bh(&bat_priv
->forw_bat_list_lock
);
516 /* own packets are not to be aggregated */
517 if ((atomic_read(&bat_priv
->aggregated_ogms
)) && (!own_packet
)) {
518 hlist_for_each_entry(forw_packet_pos
,
519 &bat_priv
->forw_bat_list
, list
) {
520 if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet
,
521 bat_priv
, packet_len
,
522 send_time
, direct_link
,
525 forw_packet_aggr
= forw_packet_pos
;
531 /* nothing to aggregate with - either aggregation disabled or no
532 * suitable aggregation packet found
534 if (!forw_packet_aggr
) {
535 /* the following section can run without the lock */
536 spin_unlock_bh(&bat_priv
->forw_bat_list_lock
);
538 /* if we could not aggregate this packet with one of the others
539 * we hold it back for a while, so that it might be aggregated
542 if (!own_packet
&& atomic_read(&bat_priv
->aggregated_ogms
))
543 send_time
+= max_aggregation_jiffies
;
545 batadv_iv_ogm_aggregate_new(packet_buff
, packet_len
,
546 send_time
, direct_link
,
547 if_incoming
, own_packet
);
549 batadv_iv_ogm_aggregate(forw_packet_aggr
, packet_buff
,
550 packet_len
, direct_link
);
551 spin_unlock_bh(&bat_priv
->forw_bat_list_lock
);
555 static void batadv_iv_ogm_forward(struct batadv_orig_node
*orig_node
,
556 const struct ethhdr
*ethhdr
,
557 struct batadv_ogm_packet
*batadv_ogm_packet
,
558 bool is_single_hop_neigh
,
559 bool is_from_best_next_hop
,
560 struct batadv_hard_iface
*if_incoming
)
562 struct batadv_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
563 uint8_t tt_num_changes
;
565 if (batadv_ogm_packet
->header
.ttl
<= 1) {
566 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
, "ttl exceeded\n");
570 if (!is_from_best_next_hop
) {
571 /* Mark the forwarded packet when it is not coming from our
572 * best next hop. We still need to forward the packet for our
573 * neighbor link quality detection to work in case the packet
574 * originated from a single hop neighbor. Otherwise we can
575 * simply drop the ogm.
577 if (is_single_hop_neigh
)
578 batadv_ogm_packet
->flags
|= BATADV_NOT_BEST_NEXT_HOP
;
583 tt_num_changes
= batadv_ogm_packet
->tt_num_changes
;
585 batadv_ogm_packet
->header
.ttl
--;
586 memcpy(batadv_ogm_packet
->prev_sender
, ethhdr
->h_source
, ETH_ALEN
);
588 /* apply hop penalty */
589 batadv_ogm_packet
->tq
= batadv_hop_penalty(batadv_ogm_packet
->tq
,
592 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
593 "Forwarding packet: tq: %i, ttl: %i\n",
594 batadv_ogm_packet
->tq
, batadv_ogm_packet
->header
.ttl
);
596 /* switch of primaries first hop flag when forwarding */
597 batadv_ogm_packet
->flags
&= ~BATADV_PRIMARIES_FIRST_HOP
;
598 if (is_single_hop_neigh
)
599 batadv_ogm_packet
->flags
|= BATADV_DIRECTLINK
;
601 batadv_ogm_packet
->flags
&= ~BATADV_DIRECTLINK
;
603 batadv_iv_ogm_queue_add(bat_priv
, (unsigned char *)batadv_ogm_packet
,
604 BATADV_OGM_HLEN
+ batadv_tt_len(tt_num_changes
),
605 if_incoming
, 0, batadv_iv_ogm_fwd_send_time());
608 static void batadv_iv_ogm_schedule(struct batadv_hard_iface
*hard_iface
)
610 struct batadv_priv
*bat_priv
= netdev_priv(hard_iface
->soft_iface
);
611 unsigned char **ogm_buff
= &hard_iface
->bat_iv
.ogm_buff
;
612 struct batadv_ogm_packet
*batadv_ogm_packet
;
613 struct batadv_hard_iface
*primary_if
;
614 int *ogm_buff_len
= &hard_iface
->bat_iv
.ogm_buff_len
;
615 int vis_server
, tt_num_changes
= 0;
619 vis_server
= atomic_read(&bat_priv
->vis_mode
);
620 primary_if
= batadv_primary_if_get_selected(bat_priv
);
622 if (hard_iface
== primary_if
)
623 tt_num_changes
= batadv_tt_append_diff(bat_priv
, ogm_buff
,
627 batadv_ogm_packet
= (struct batadv_ogm_packet
*)(*ogm_buff
);
629 /* change sequence number to network order */
630 seqno
= (uint32_t)atomic_read(&hard_iface
->bat_iv
.ogm_seqno
);
631 batadv_ogm_packet
->seqno
= htonl(seqno
);
632 atomic_inc(&hard_iface
->bat_iv
.ogm_seqno
);
634 batadv_ogm_packet
->ttvn
= atomic_read(&bat_priv
->tt
.vn
);
635 batadv_ogm_packet
->tt_crc
= htons(bat_priv
->tt
.local_crc
);
636 if (tt_num_changes
>= 0)
637 batadv_ogm_packet
->tt_num_changes
= tt_num_changes
;
639 if (vis_server
== BATADV_VIS_TYPE_SERVER_SYNC
)
640 batadv_ogm_packet
->flags
|= BATADV_VIS_SERVER
;
642 batadv_ogm_packet
->flags
&= ~BATADV_VIS_SERVER
;
644 if (hard_iface
== primary_if
&&
645 atomic_read(&bat_priv
->gw_mode
) == BATADV_GW_MODE_SERVER
) {
646 bandwidth
= (uint8_t)atomic_read(&bat_priv
->gw_bandwidth
);
647 batadv_ogm_packet
->gw_flags
= bandwidth
;
649 batadv_ogm_packet
->gw_flags
= BATADV_NO_FLAGS
;
652 batadv_slide_own_bcast_window(hard_iface
);
653 batadv_iv_ogm_queue_add(bat_priv
, hard_iface
->bat_iv
.ogm_buff
,
654 hard_iface
->bat_iv
.ogm_buff_len
, hard_iface
, 1,
655 batadv_iv_ogm_emit_send_time(bat_priv
));
658 batadv_hardif_free_ref(primary_if
);
662 batadv_iv_ogm_orig_update(struct batadv_priv
*bat_priv
,
663 struct batadv_orig_node
*orig_node
,
664 const struct ethhdr
*ethhdr
,
665 const struct batadv_ogm_packet
*batadv_ogm_packet
,
666 struct batadv_hard_iface
*if_incoming
,
667 const unsigned char *tt_buff
,
668 enum batadv_dup_status dup_status
)
670 struct batadv_neigh_node
*neigh_node
= NULL
, *tmp_neigh_node
= NULL
;
671 struct batadv_neigh_node
*router
= NULL
;
672 struct batadv_orig_node
*orig_node_tmp
;
674 uint8_t sum_orig
, sum_neigh
;
678 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
679 "update_originator(): Searching and updating originator entry of received packet\n");
682 hlist_for_each_entry_rcu(tmp_neigh_node
,
683 &orig_node
->neigh_list
, list
) {
684 neigh_addr
= tmp_neigh_node
->addr
;
685 if (batadv_compare_eth(neigh_addr
, ethhdr
->h_source
) &&
686 tmp_neigh_node
->if_incoming
== if_incoming
&&
687 atomic_inc_not_zero(&tmp_neigh_node
->refcount
)) {
689 batadv_neigh_node_free_ref(neigh_node
);
690 neigh_node
= tmp_neigh_node
;
694 if (dup_status
!= BATADV_NO_DUP
)
697 spin_lock_bh(&tmp_neigh_node
->lq_update_lock
);
698 batadv_ring_buffer_set(tmp_neigh_node
->tq_recv
,
699 &tmp_neigh_node
->tq_index
, 0);
700 tq_avg
= batadv_ring_buffer_avg(tmp_neigh_node
->tq_recv
);
701 tmp_neigh_node
->tq_avg
= tq_avg
;
702 spin_unlock_bh(&tmp_neigh_node
->lq_update_lock
);
706 struct batadv_orig_node
*orig_tmp
;
708 orig_tmp
= batadv_get_orig_node(bat_priv
, ethhdr
->h_source
);
712 neigh_node
= batadv_iv_ogm_neigh_new(if_incoming
,
715 batadv_ogm_packet
->seqno
);
717 batadv_orig_node_free_ref(orig_tmp
);
721 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
722 "Updating existing last-hop neighbor of originator\n");
726 orig_node
->flags
= batadv_ogm_packet
->flags
;
727 neigh_node
->last_seen
= jiffies
;
729 spin_lock_bh(&neigh_node
->lq_update_lock
);
730 batadv_ring_buffer_set(neigh_node
->tq_recv
,
731 &neigh_node
->tq_index
,
732 batadv_ogm_packet
->tq
);
733 neigh_node
->tq_avg
= batadv_ring_buffer_avg(neigh_node
->tq_recv
);
734 spin_unlock_bh(&neigh_node
->lq_update_lock
);
736 if (dup_status
== BATADV_NO_DUP
) {
737 orig_node
->last_ttl
= batadv_ogm_packet
->header
.ttl
;
738 neigh_node
->last_ttl
= batadv_ogm_packet
->header
.ttl
;
741 batadv_bonding_candidate_add(orig_node
, neigh_node
);
743 /* if this neighbor already is our next hop there is nothing
746 router
= batadv_orig_node_get_router(orig_node
);
747 if (router
== neigh_node
)
750 /* if this neighbor does not offer a better TQ we won't consider it */
751 if (router
&& (router
->tq_avg
> neigh_node
->tq_avg
))
754 /* if the TQ is the same and the link not more symmetric we
755 * won't consider it either
757 if (router
&& (neigh_node
->tq_avg
== router
->tq_avg
)) {
758 orig_node_tmp
= router
->orig_node
;
759 spin_lock_bh(&orig_node_tmp
->ogm_cnt_lock
);
760 if_num
= router
->if_incoming
->if_num
;
761 sum_orig
= orig_node_tmp
->bcast_own_sum
[if_num
];
762 spin_unlock_bh(&orig_node_tmp
->ogm_cnt_lock
);
764 orig_node_tmp
= neigh_node
->orig_node
;
765 spin_lock_bh(&orig_node_tmp
->ogm_cnt_lock
);
766 if_num
= neigh_node
->if_incoming
->if_num
;
767 sum_neigh
= orig_node_tmp
->bcast_own_sum
[if_num
];
768 spin_unlock_bh(&orig_node_tmp
->ogm_cnt_lock
);
770 if (sum_orig
>= sum_neigh
)
774 batadv_update_route(bat_priv
, orig_node
, neigh_node
);
777 /* I have to check for transtable changes only if the OGM has been
778 * sent through a primary interface
780 if (((batadv_ogm_packet
->orig
!= ethhdr
->h_source
) &&
781 (batadv_ogm_packet
->header
.ttl
> 2)) ||
782 (batadv_ogm_packet
->flags
& BATADV_PRIMARIES_FIRST_HOP
))
783 batadv_tt_update_orig(bat_priv
, orig_node
, tt_buff
,
784 batadv_ogm_packet
->tt_num_changes
,
785 batadv_ogm_packet
->ttvn
,
786 ntohs(batadv_ogm_packet
->tt_crc
));
788 if (orig_node
->gw_flags
!= batadv_ogm_packet
->gw_flags
)
789 batadv_gw_node_update(bat_priv
, orig_node
,
790 batadv_ogm_packet
->gw_flags
);
792 orig_node
->gw_flags
= batadv_ogm_packet
->gw_flags
;
794 /* restart gateway selection if fast or late switching was enabled */
795 if ((orig_node
->gw_flags
) &&
796 (atomic_read(&bat_priv
->gw_mode
) == BATADV_GW_MODE_CLIENT
) &&
797 (atomic_read(&bat_priv
->gw_sel_class
) > 2))
798 batadv_gw_check_election(bat_priv
, orig_node
);
806 batadv_neigh_node_free_ref(neigh_node
);
808 batadv_neigh_node_free_ref(router
);
811 static int batadv_iv_ogm_calc_tq(struct batadv_orig_node
*orig_node
,
812 struct batadv_orig_node
*orig_neigh_node
,
813 struct batadv_ogm_packet
*batadv_ogm_packet
,
814 struct batadv_hard_iface
*if_incoming
)
816 struct batadv_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
817 struct batadv_neigh_node
*neigh_node
= NULL
, *tmp_neigh_node
;
819 uint8_t orig_eq_count
, neigh_rq_count
, neigh_rq_inv
, tq_own
;
820 unsigned int neigh_rq_inv_cube
, neigh_rq_max_cube
;
821 int tq_asym_penalty
, inv_asym_penalty
, ret
= 0;
822 unsigned int combined_tq
;
824 /* find corresponding one hop neighbor */
826 hlist_for_each_entry_rcu(tmp_neigh_node
,
827 &orig_neigh_node
->neigh_list
, list
) {
828 if (!batadv_compare_eth(tmp_neigh_node
->addr
,
829 orig_neigh_node
->orig
))
832 if (tmp_neigh_node
->if_incoming
!= if_incoming
)
835 if (!atomic_inc_not_zero(&tmp_neigh_node
->refcount
))
838 neigh_node
= tmp_neigh_node
;
844 neigh_node
= batadv_iv_ogm_neigh_new(if_incoming
,
845 orig_neigh_node
->orig
,
848 batadv_ogm_packet
->seqno
);
853 /* if orig_node is direct neighbor update neigh_node last_seen */
854 if (orig_node
== orig_neigh_node
)
855 neigh_node
->last_seen
= jiffies
;
857 orig_node
->last_seen
= jiffies
;
859 /* find packet count of corresponding one hop neighbor */
860 spin_lock_bh(&orig_node
->ogm_cnt_lock
);
861 orig_eq_count
= orig_neigh_node
->bcast_own_sum
[if_incoming
->if_num
];
862 neigh_rq_count
= neigh_node
->real_packet_count
;
863 spin_unlock_bh(&orig_node
->ogm_cnt_lock
);
865 /* pay attention to not get a value bigger than 100 % */
866 if (orig_eq_count
> neigh_rq_count
)
867 total_count
= neigh_rq_count
;
869 total_count
= orig_eq_count
;
871 /* if we have too few packets (too less data) we set tq_own to zero
872 * if we receive too few packets it is not considered bidirectional
874 if (total_count
< BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM
||
875 neigh_rq_count
< BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM
)
878 /* neigh_node->real_packet_count is never zero as we
879 * only purge old information when getting new
882 tq_own
= (BATADV_TQ_MAX_VALUE
* total_count
) / neigh_rq_count
;
884 /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
885 * affect the nearly-symmetric links only a little, but
886 * punishes asymmetric links more. This will give a value
887 * between 0 and TQ_MAX_VALUE
889 neigh_rq_inv
= BATADV_TQ_LOCAL_WINDOW_SIZE
- neigh_rq_count
;
890 neigh_rq_inv_cube
= neigh_rq_inv
* neigh_rq_inv
* neigh_rq_inv
;
891 neigh_rq_max_cube
= BATADV_TQ_LOCAL_WINDOW_SIZE
*
892 BATADV_TQ_LOCAL_WINDOW_SIZE
*
893 BATADV_TQ_LOCAL_WINDOW_SIZE
;
894 inv_asym_penalty
= BATADV_TQ_MAX_VALUE
* neigh_rq_inv_cube
;
895 inv_asym_penalty
/= neigh_rq_max_cube
;
896 tq_asym_penalty
= BATADV_TQ_MAX_VALUE
- inv_asym_penalty
;
898 combined_tq
= batadv_ogm_packet
->tq
* tq_own
* tq_asym_penalty
;
899 combined_tq
/= BATADV_TQ_MAX_VALUE
* BATADV_TQ_MAX_VALUE
;
900 batadv_ogm_packet
->tq
= combined_tq
;
902 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
903 "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n",
904 orig_node
->orig
, orig_neigh_node
->orig
, total_count
,
905 neigh_rq_count
, tq_own
,
906 tq_asym_penalty
, batadv_ogm_packet
->tq
);
908 /* if link has the minimum required transmission quality
909 * consider it bidirectional
911 if (batadv_ogm_packet
->tq
>= BATADV_TQ_TOTAL_BIDRECT_LIMIT
)
916 batadv_neigh_node_free_ref(neigh_node
);
921 * batadv_iv_ogm_update_seqnos - process a batman packet for all interfaces,
922 * adjust the sequence number and find out whether it is a duplicate
923 * @ethhdr: ethernet header of the packet
924 * @batadv_ogm_packet: OGM packet to be considered
925 * @if_incoming: interface on which the OGM packet was received
927 * Returns duplicate status as enum batadv_dup_status
929 static enum batadv_dup_status
930 batadv_iv_ogm_update_seqnos(const struct ethhdr
*ethhdr
,
931 const struct batadv_ogm_packet
*batadv_ogm_packet
,
932 const struct batadv_hard_iface
*if_incoming
)
934 struct batadv_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
935 struct batadv_orig_node
*orig_node
;
936 struct batadv_neigh_node
*tmp_neigh_node
;
941 enum batadv_dup_status ret
= BATADV_NO_DUP
;
942 uint32_t seqno
= ntohl(batadv_ogm_packet
->seqno
);
944 uint8_t packet_count
;
946 orig_node
= batadv_get_orig_node(bat_priv
, batadv_ogm_packet
->orig
);
948 return BATADV_NO_DUP
;
950 spin_lock_bh(&orig_node
->ogm_cnt_lock
);
951 seq_diff
= seqno
- orig_node
->last_real_seqno
;
953 /* signalize caller that the packet is to be dropped. */
954 if (!hlist_empty(&orig_node
->neigh_list
) &&
955 batadv_window_protected(bat_priv
, seq_diff
,
956 &orig_node
->batman_seqno_reset
)) {
957 ret
= BATADV_PROTECTED
;
962 hlist_for_each_entry_rcu(tmp_neigh_node
,
963 &orig_node
->neigh_list
, list
) {
964 neigh_addr
= tmp_neigh_node
->addr
;
965 is_dup
= batadv_test_bit(tmp_neigh_node
->real_bits
,
966 orig_node
->last_real_seqno
,
969 if (batadv_compare_eth(neigh_addr
, ethhdr
->h_source
) &&
970 tmp_neigh_node
->if_incoming
== if_incoming
) {
973 ret
= BATADV_NEIGH_DUP
;
976 if (is_dup
&& (ret
!= BATADV_NEIGH_DUP
))
977 ret
= BATADV_ORIG_DUP
;
980 /* if the window moved, set the update flag. */
981 need_update
|= batadv_bit_get_packet(bat_priv
,
982 tmp_neigh_node
->real_bits
,
985 packet_count
= bitmap_weight(tmp_neigh_node
->real_bits
,
986 BATADV_TQ_LOCAL_WINDOW_SIZE
);
987 tmp_neigh_node
->real_packet_count
= packet_count
;
992 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
993 "updating last_seqno: old %u, new %u\n",
994 orig_node
->last_real_seqno
, seqno
);
995 orig_node
->last_real_seqno
= seqno
;
999 spin_unlock_bh(&orig_node
->ogm_cnt_lock
);
1000 batadv_orig_node_free_ref(orig_node
);
1004 static void batadv_iv_ogm_process(const struct ethhdr
*ethhdr
,
1005 struct batadv_ogm_packet
*batadv_ogm_packet
,
1006 const unsigned char *tt_buff
,
1007 struct batadv_hard_iface
*if_incoming
)
1009 struct batadv_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
1010 struct batadv_hard_iface
*hard_iface
;
1011 struct batadv_orig_node
*orig_neigh_node
, *orig_node
;
1012 struct batadv_neigh_node
*router
= NULL
, *router_router
= NULL
;
1013 struct batadv_neigh_node
*orig_neigh_router
= NULL
;
1014 int has_directlink_flag
;
1015 int is_my_addr
= 0, is_my_orig
= 0, is_my_oldorig
= 0;
1016 int is_broadcast
= 0, is_bidirect
;
1017 bool is_single_hop_neigh
= false;
1018 bool is_from_best_next_hop
= false;
1019 int sameseq
, similar_ttl
;
1020 enum batadv_dup_status dup_status
;
1021 uint32_t if_incoming_seqno
;
1022 uint8_t *prev_sender
;
1024 /* Silently drop when the batman packet is actually not a
1027 * This might happen if a packet is padded (e.g. Ethernet has a
1028 * minimum frame length of 64 byte) and the aggregation interprets
1029 * it as an additional length.
1031 * TODO: A more sane solution would be to have a bit in the
1032 * batadv_ogm_packet to detect whether the packet is the last
1033 * packet in an aggregation. Here we expect that the padding
1034 * is always zero (or not 0x01)
1036 if (batadv_ogm_packet
->header
.packet_type
!= BATADV_IV_OGM
)
1039 /* could be changed by schedule_own_packet() */
1040 if_incoming_seqno
= atomic_read(&if_incoming
->bat_iv
.ogm_seqno
);
1042 if (batadv_ogm_packet
->flags
& BATADV_DIRECTLINK
)
1043 has_directlink_flag
= 1;
1045 has_directlink_flag
= 0;
1047 if (batadv_compare_eth(ethhdr
->h_source
, batadv_ogm_packet
->orig
))
1048 is_single_hop_neigh
= true;
1050 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1051 "Received BATMAN packet via NB: %pM, IF: %s [%pM] (from OG: %pM, via prev OG: %pM, seqno %u, ttvn %u, crc %#.4x, changes %u, tq %d, TTL %d, V %d, IDF %d)\n",
1052 ethhdr
->h_source
, if_incoming
->net_dev
->name
,
1053 if_incoming
->net_dev
->dev_addr
, batadv_ogm_packet
->orig
,
1054 batadv_ogm_packet
->prev_sender
,
1055 ntohl(batadv_ogm_packet
->seqno
), batadv_ogm_packet
->ttvn
,
1056 ntohs(batadv_ogm_packet
->tt_crc
),
1057 batadv_ogm_packet
->tt_num_changes
, batadv_ogm_packet
->tq
,
1058 batadv_ogm_packet
->header
.ttl
,
1059 batadv_ogm_packet
->header
.version
, has_directlink_flag
);
1062 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
1063 if (hard_iface
->if_status
!= BATADV_IF_ACTIVE
)
1066 if (hard_iface
->soft_iface
!= if_incoming
->soft_iface
)
1069 if (batadv_compare_eth(ethhdr
->h_source
,
1070 hard_iface
->net_dev
->dev_addr
))
1073 if (batadv_compare_eth(batadv_ogm_packet
->orig
,
1074 hard_iface
->net_dev
->dev_addr
))
1077 if (batadv_compare_eth(batadv_ogm_packet
->prev_sender
,
1078 hard_iface
->net_dev
->dev_addr
))
1081 if (is_broadcast_ether_addr(ethhdr
->h_source
))
1086 if (batadv_ogm_packet
->header
.version
!= BATADV_COMPAT_VERSION
) {
1087 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1088 "Drop packet: incompatible batman version (%i)\n",
1089 batadv_ogm_packet
->header
.version
);
1094 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1095 "Drop packet: received my own broadcast (sender: %pM)\n",
1101 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1102 "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n",
1108 unsigned long *word
;
1114 orig_neigh_node
= batadv_get_orig_node(bat_priv
,
1116 if (!orig_neigh_node
)
1119 /* neighbor has to indicate direct link and it has to
1120 * come via the corresponding interface
1121 * save packet seqno for bidirectional check
1123 if (has_directlink_flag
&&
1124 batadv_compare_eth(if_incoming
->net_dev
->dev_addr
,
1125 batadv_ogm_packet
->orig
)) {
1126 if_num
= if_incoming
->if_num
;
1127 offset
= if_num
* BATADV_NUM_WORDS
;
1129 spin_lock_bh(&orig_neigh_node
->ogm_cnt_lock
);
1130 word
= &(orig_neigh_node
->bcast_own
[offset
]);
1131 bit_pos
= if_incoming_seqno
- 2;
1132 bit_pos
-= ntohl(batadv_ogm_packet
->seqno
);
1133 batadv_set_bit(word
, bit_pos
);
1134 weight
= &orig_neigh_node
->bcast_own_sum
[if_num
];
1135 *weight
= bitmap_weight(word
,
1136 BATADV_TQ_LOCAL_WINDOW_SIZE
);
1137 spin_unlock_bh(&orig_neigh_node
->ogm_cnt_lock
);
1140 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1141 "Drop packet: originator packet from myself (via neighbor)\n");
1142 batadv_orig_node_free_ref(orig_neigh_node
);
1146 if (is_my_oldorig
) {
1147 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1148 "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1153 if (batadv_ogm_packet
->flags
& BATADV_NOT_BEST_NEXT_HOP
) {
1154 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1155 "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1160 orig_node
= batadv_get_orig_node(bat_priv
, batadv_ogm_packet
->orig
);
1164 dup_status
= batadv_iv_ogm_update_seqnos(ethhdr
, batadv_ogm_packet
,
1167 if (dup_status
== BATADV_PROTECTED
) {
1168 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1169 "Drop packet: packet within seqno protection time (sender: %pM)\n",
1174 if (batadv_ogm_packet
->tq
== 0) {
1175 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1176 "Drop packet: originator packet with tq equal 0\n");
1180 router
= batadv_orig_node_get_router(orig_node
);
1182 router_router
= batadv_orig_node_get_router(router
->orig_node
);
1184 if ((router
&& router
->tq_avg
!= 0) &&
1185 (batadv_compare_eth(router
->addr
, ethhdr
->h_source
)))
1186 is_from_best_next_hop
= true;
1188 prev_sender
= batadv_ogm_packet
->prev_sender
;
1189 /* avoid temporary routing loops */
1190 if (router
&& router_router
&&
1191 (batadv_compare_eth(router
->addr
, prev_sender
)) &&
1192 !(batadv_compare_eth(batadv_ogm_packet
->orig
, prev_sender
)) &&
1193 (batadv_compare_eth(router
->addr
, router_router
->addr
))) {
1194 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1195 "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1200 /* if sender is a direct neighbor the sender mac equals
1203 if (is_single_hop_neigh
)
1204 orig_neigh_node
= orig_node
;
1206 orig_neigh_node
= batadv_get_orig_node(bat_priv
,
1209 if (!orig_neigh_node
)
1212 /* Update nc_nodes of the originator */
1213 batadv_nc_update_nc_node(bat_priv
, orig_node
, orig_neigh_node
,
1214 batadv_ogm_packet
, is_single_hop_neigh
);
1216 orig_neigh_router
= batadv_orig_node_get_router(orig_neigh_node
);
1218 /* drop packet if sender is not a direct neighbor and if we
1219 * don't route towards it
1221 if (!is_single_hop_neigh
&& (!orig_neigh_router
)) {
1222 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1223 "Drop packet: OGM via unknown neighbor!\n");
1227 is_bidirect
= batadv_iv_ogm_calc_tq(orig_node
, orig_neigh_node
,
1228 batadv_ogm_packet
, if_incoming
);
1230 batadv_bonding_save_primary(orig_node
, orig_neigh_node
,
1233 /* update ranking if it is not a duplicate or has the same
1234 * seqno and similar ttl as the non-duplicate
1236 sameseq
= orig_node
->last_real_seqno
== ntohl(batadv_ogm_packet
->seqno
);
1237 similar_ttl
= orig_node
->last_ttl
- 3 <= batadv_ogm_packet
->header
.ttl
;
1238 if (is_bidirect
&& ((dup_status
== BATADV_NO_DUP
) ||
1239 (sameseq
&& similar_ttl
)))
1240 batadv_iv_ogm_orig_update(bat_priv
, orig_node
, ethhdr
,
1241 batadv_ogm_packet
, if_incoming
,
1242 tt_buff
, dup_status
);
1244 /* is single hop (direct) neighbor */
1245 if (is_single_hop_neigh
) {
1246 /* mark direct link on incoming interface */
1247 batadv_iv_ogm_forward(orig_node
, ethhdr
, batadv_ogm_packet
,
1248 is_single_hop_neigh
,
1249 is_from_best_next_hop
, if_incoming
);
1251 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1252 "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1256 /* multihop originator */
1258 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1259 "Drop packet: not received via bidirectional link\n");
1263 if (dup_status
== BATADV_NEIGH_DUP
) {
1264 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1265 "Drop packet: duplicate packet received\n");
1269 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
1270 "Forwarding packet: rebroadcast originator packet\n");
1271 batadv_iv_ogm_forward(orig_node
, ethhdr
, batadv_ogm_packet
,
1272 is_single_hop_neigh
, is_from_best_next_hop
,
1276 if ((orig_neigh_node
) && (!is_single_hop_neigh
))
1277 batadv_orig_node_free_ref(orig_neigh_node
);
1280 batadv_neigh_node_free_ref(router
);
1282 batadv_neigh_node_free_ref(router_router
);
1283 if (orig_neigh_router
)
1284 batadv_neigh_node_free_ref(orig_neigh_router
);
1286 batadv_orig_node_free_ref(orig_node
);
1289 static int batadv_iv_ogm_receive(struct sk_buff
*skb
,
1290 struct batadv_hard_iface
*if_incoming
)
1292 struct batadv_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
1293 struct batadv_ogm_packet
*batadv_ogm_packet
;
1294 struct ethhdr
*ethhdr
;
1295 int buff_pos
= 0, packet_len
;
1296 unsigned char *tt_buff
, *packet_buff
;
1298 uint8_t *packet_pos
;
1300 ret
= batadv_check_management_packet(skb
, if_incoming
, BATADV_OGM_HLEN
);
1304 /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1305 * that does not have B.A.T.M.A.N. IV enabled ?
1307 if (bat_priv
->bat_algo_ops
->bat_ogm_emit
!= batadv_iv_ogm_emit
)
1310 batadv_inc_counter(bat_priv
, BATADV_CNT_MGMT_RX
);
1311 batadv_add_counter(bat_priv
, BATADV_CNT_MGMT_RX_BYTES
,
1312 skb
->len
+ ETH_HLEN
);
1314 packet_len
= skb_headlen(skb
);
1315 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
1316 packet_buff
= skb
->data
;
1317 batadv_ogm_packet
= (struct batadv_ogm_packet
*)packet_buff
;
1319 /* unpack the aggregated packets and process them one by one */
1320 while (batadv_iv_ogm_aggr_packet(buff_pos
, packet_len
,
1321 batadv_ogm_packet
->tt_num_changes
)) {
1322 tt_buff
= packet_buff
+ buff_pos
+ BATADV_OGM_HLEN
;
1324 batadv_iv_ogm_process(ethhdr
, batadv_ogm_packet
, tt_buff
,
1327 buff_pos
+= BATADV_OGM_HLEN
;
1328 buff_pos
+= batadv_tt_len(batadv_ogm_packet
->tt_num_changes
);
1330 packet_pos
= packet_buff
+ buff_pos
;
1331 batadv_ogm_packet
= (struct batadv_ogm_packet
*)packet_pos
;
1335 return NET_RX_SUCCESS
;
1338 static struct batadv_algo_ops batadv_batman_iv __read_mostly
= {
1339 .name
= "BATMAN_IV",
1340 .bat_iface_enable
= batadv_iv_ogm_iface_enable
,
1341 .bat_iface_disable
= batadv_iv_ogm_iface_disable
,
1342 .bat_iface_update_mac
= batadv_iv_ogm_iface_update_mac
,
1343 .bat_primary_iface_set
= batadv_iv_ogm_primary_iface_set
,
1344 .bat_ogm_schedule
= batadv_iv_ogm_schedule
,
1345 .bat_ogm_emit
= batadv_iv_ogm_emit
,
1348 int __init
batadv_iv_init(void)
1352 /* batman originator packet */
1353 ret
= batadv_recv_handler_register(BATADV_IV_OGM
,
1354 batadv_iv_ogm_receive
);
1358 ret
= batadv_algo_register(&batadv_batman_iv
);
1360 goto handler_unregister
;
1365 batadv_recv_handler_unregister(BATADV_IV_OGM
);