2 * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
4 * Marek Lindner, Simon Wunderlich
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of version 2 of the GNU General Public
8 * License as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
26 #include "soft-interface.h"
27 #include "hard-interface.h"
28 #include "icmp_socket.h"
29 #include "translation-table.h"
30 #include "originator.h"
32 #include "ring_buffer.h"
34 #include "aggregation.h"
37 void slide_own_bcast_window(struct batman_if
*batman_if
)
39 struct bat_priv
*bat_priv
= netdev_priv(batman_if
->soft_iface
);
41 struct orig_node
*orig_node
;
45 spin_lock_irqsave(&bat_priv
->orig_hash_lock
, flags
);
47 while (hash_iterate(bat_priv
->orig_hash
, &hashit
)) {
48 orig_node
= hashit
.bucket
->data
;
49 word
= &(orig_node
->bcast_own
[batman_if
->if_num
* NUM_WORDS
]);
51 bit_get_packet(bat_priv
, word
, 1, 0);
52 orig_node
->bcast_own_sum
[batman_if
->if_num
] =
53 bit_packet_count(word
);
56 spin_unlock_irqrestore(&bat_priv
->orig_hash_lock
, flags
);
59 static void update_HNA(struct bat_priv
*bat_priv
, struct orig_node
*orig_node
,
60 unsigned char *hna_buff
, int hna_buff_len
)
62 if ((hna_buff_len
!= orig_node
->hna_buff_len
) ||
63 ((hna_buff_len
> 0) &&
64 (orig_node
->hna_buff_len
> 0) &&
65 (memcmp(orig_node
->hna_buff
, hna_buff
, hna_buff_len
) != 0))) {
67 if (orig_node
->hna_buff_len
> 0)
68 hna_global_del_orig(bat_priv
, orig_node
,
69 "originator changed hna");
71 if ((hna_buff_len
> 0) && (hna_buff
!= NULL
))
72 hna_global_add_orig(bat_priv
, orig_node
,
73 hna_buff
, hna_buff_len
);
77 static void update_route(struct bat_priv
*bat_priv
,
78 struct orig_node
*orig_node
,
79 struct neigh_node
*neigh_node
,
80 unsigned char *hna_buff
, int hna_buff_len
)
83 if ((orig_node
->router
!= NULL
) && (neigh_node
== NULL
)) {
85 bat_dbg(DBG_ROUTES
, bat_priv
, "Deleting route towards: %pM\n",
87 hna_global_del_orig(bat_priv
, orig_node
,
88 "originator timed out");
91 } else if ((orig_node
->router
== NULL
) && (neigh_node
!= NULL
)) {
93 bat_dbg(DBG_ROUTES
, bat_priv
,
94 "Adding route towards: %pM (via %pM)\n",
95 orig_node
->orig
, neigh_node
->addr
);
96 hna_global_add_orig(bat_priv
, orig_node
,
97 hna_buff
, hna_buff_len
);
101 bat_dbg(DBG_ROUTES
, bat_priv
,
102 "Changing route towards: %pM "
103 "(now via %pM - was via %pM)\n",
104 orig_node
->orig
, neigh_node
->addr
,
105 orig_node
->router
->addr
);
108 orig_node
->router
= neigh_node
;
112 void update_routes(struct bat_priv
*bat_priv
, struct orig_node
*orig_node
,
113 struct neigh_node
*neigh_node
, unsigned char *hna_buff
,
117 if (orig_node
== NULL
)
120 if (orig_node
->router
!= neigh_node
)
121 update_route(bat_priv
, orig_node
, neigh_node
,
122 hna_buff
, hna_buff_len
);
123 /* may be just HNA changed */
125 update_HNA(bat_priv
, orig_node
, hna_buff
, hna_buff_len
);
128 static int is_bidirectional_neigh(struct orig_node
*orig_node
,
129 struct orig_node
*orig_neigh_node
,
130 struct batman_packet
*batman_packet
,
131 struct batman_if
*if_incoming
)
133 struct bat_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
134 struct neigh_node
*neigh_node
= NULL
, *tmp_neigh_node
= NULL
;
135 unsigned char total_count
;
137 if (orig_node
== orig_neigh_node
) {
138 list_for_each_entry(tmp_neigh_node
,
139 &orig_node
->neigh_list
,
142 if (compare_orig(tmp_neigh_node
->addr
,
143 orig_neigh_node
->orig
) &&
144 (tmp_neigh_node
->if_incoming
== if_incoming
))
145 neigh_node
= tmp_neigh_node
;
149 neigh_node
= create_neighbor(orig_node
,
151 orig_neigh_node
->orig
,
153 /* create_neighbor failed, return 0 */
157 neigh_node
->last_valid
= jiffies
;
159 /* find packet count of corresponding one hop neighbor */
160 list_for_each_entry(tmp_neigh_node
,
161 &orig_neigh_node
->neigh_list
, list
) {
163 if (compare_orig(tmp_neigh_node
->addr
,
164 orig_neigh_node
->orig
) &&
165 (tmp_neigh_node
->if_incoming
== if_incoming
))
166 neigh_node
= tmp_neigh_node
;
170 neigh_node
= create_neighbor(orig_neigh_node
,
172 orig_neigh_node
->orig
,
174 /* create_neighbor failed, return 0 */
179 orig_node
->last_valid
= jiffies
;
181 /* pay attention to not get a value bigger than 100 % */
182 total_count
= (orig_neigh_node
->bcast_own_sum
[if_incoming
->if_num
] >
183 neigh_node
->real_packet_count
?
184 neigh_node
->real_packet_count
:
185 orig_neigh_node
->bcast_own_sum
[if_incoming
->if_num
]);
187 /* if we have too few packets (too less data) we set tq_own to zero */
188 /* if we receive too few packets it is not considered bidirectional */
189 if ((total_count
< TQ_LOCAL_BIDRECT_SEND_MINIMUM
) ||
190 (neigh_node
->real_packet_count
< TQ_LOCAL_BIDRECT_RECV_MINIMUM
))
191 orig_neigh_node
->tq_own
= 0;
193 /* neigh_node->real_packet_count is never zero as we
194 * only purge old information when getting new
196 orig_neigh_node
->tq_own
= (TQ_MAX_VALUE
* total_count
) /
197 neigh_node
->real_packet_count
;
200 * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
201 * affect the nearly-symmetric links only a little, but
202 * punishes asymmetric links more. This will give a value
203 * between 0 and TQ_MAX_VALUE
205 orig_neigh_node
->tq_asym_penalty
=
208 (TQ_LOCAL_WINDOW_SIZE
- neigh_node
->real_packet_count
) *
209 (TQ_LOCAL_WINDOW_SIZE
- neigh_node
->real_packet_count
) *
210 (TQ_LOCAL_WINDOW_SIZE
- neigh_node
->real_packet_count
)) /
211 (TQ_LOCAL_WINDOW_SIZE
*
212 TQ_LOCAL_WINDOW_SIZE
*
213 TQ_LOCAL_WINDOW_SIZE
);
215 batman_packet
->tq
= ((batman_packet
->tq
*
216 orig_neigh_node
->tq_own
*
217 orig_neigh_node
->tq_asym_penalty
) /
218 (TQ_MAX_VALUE
* TQ_MAX_VALUE
));
220 bat_dbg(DBG_BATMAN
, bat_priv
,
222 "orig = %-15pM neigh = %-15pM => own_bcast = %2i, "
223 "real recv = %2i, local tq: %3i, asym_penalty: %3i, "
225 orig_node
->orig
, orig_neigh_node
->orig
, total_count
,
226 neigh_node
->real_packet_count
, orig_neigh_node
->tq_own
,
227 orig_neigh_node
->tq_asym_penalty
, batman_packet
->tq
);
229 /* if link has the minimum required transmission quality
230 * consider it bidirectional */
231 if (batman_packet
->tq
>= TQ_TOTAL_BIDRECT_LIMIT
)
237 static void update_orig(struct bat_priv
*bat_priv
,
238 struct orig_node
*orig_node
,
239 struct ethhdr
*ethhdr
,
240 struct batman_packet
*batman_packet
,
241 struct batman_if
*if_incoming
,
242 unsigned char *hna_buff
, int hna_buff_len
,
245 struct neigh_node
*neigh_node
= NULL
, *tmp_neigh_node
= NULL
;
246 int tmp_hna_buff_len
;
248 bat_dbg(DBG_BATMAN
, bat_priv
, "update_originator(): "
249 "Searching and updating originator entry of received packet\n");
251 list_for_each_entry(tmp_neigh_node
, &orig_node
->neigh_list
, list
) {
252 if (compare_orig(tmp_neigh_node
->addr
, ethhdr
->h_source
) &&
253 (tmp_neigh_node
->if_incoming
== if_incoming
)) {
254 neigh_node
= tmp_neigh_node
;
261 ring_buffer_set(tmp_neigh_node
->tq_recv
,
262 &tmp_neigh_node
->tq_index
, 0);
263 tmp_neigh_node
->tq_avg
=
264 ring_buffer_avg(tmp_neigh_node
->tq_recv
);
268 struct orig_node
*orig_tmp
;
270 orig_tmp
= get_orig_node(bat_priv
, ethhdr
->h_source
);
274 neigh_node
= create_neighbor(orig_node
, orig_tmp
,
275 ethhdr
->h_source
, if_incoming
);
279 bat_dbg(DBG_BATMAN
, bat_priv
,
280 "Updating existing last-hop neighbor of originator\n");
282 orig_node
->flags
= batman_packet
->flags
;
283 neigh_node
->last_valid
= jiffies
;
285 ring_buffer_set(neigh_node
->tq_recv
,
286 &neigh_node
->tq_index
,
288 neigh_node
->tq_avg
= ring_buffer_avg(neigh_node
->tq_recv
);
291 orig_node
->last_ttl
= batman_packet
->ttl
;
292 neigh_node
->last_ttl
= batman_packet
->ttl
;
295 tmp_hna_buff_len
= (hna_buff_len
> batman_packet
->num_hna
* ETH_ALEN
?
296 batman_packet
->num_hna
* ETH_ALEN
: hna_buff_len
);
298 /* if this neighbor already is our next hop there is nothing
300 if (orig_node
->router
== neigh_node
)
303 /* if this neighbor does not offer a better TQ we won't consider it */
304 if ((orig_node
->router
) &&
305 (orig_node
->router
->tq_avg
> neigh_node
->tq_avg
))
308 /* if the TQ is the same and the link not more symetric we
309 * won't consider it either */
310 if ((orig_node
->router
) &&
311 ((neigh_node
->tq_avg
== orig_node
->router
->tq_avg
) &&
312 (orig_node
->router
->orig_node
->bcast_own_sum
[if_incoming
->if_num
]
313 >= neigh_node
->orig_node
->bcast_own_sum
[if_incoming
->if_num
])))
316 update_routes(bat_priv
, orig_node
, neigh_node
,
317 hna_buff
, tmp_hna_buff_len
);
321 update_routes(bat_priv
, orig_node
, orig_node
->router
,
322 hna_buff
, tmp_hna_buff_len
);
325 /* checks whether the host restarted and is in the protection time.
327 * 0 if the packet is to be accepted
328 * 1 if the packet is to be ignored.
330 static int window_protected(struct bat_priv
*bat_priv
,
331 int32_t seq_num_diff
,
332 unsigned long *last_reset
)
334 if ((seq_num_diff
<= -TQ_LOCAL_WINDOW_SIZE
)
335 || (seq_num_diff
>= EXPECTED_SEQNO_RANGE
)) {
336 if (time_after(jiffies
, *last_reset
+
337 msecs_to_jiffies(RESET_PROTECTION_MS
))) {
339 *last_reset
= jiffies
;
340 bat_dbg(DBG_BATMAN
, bat_priv
,
341 "old packet received, start protection\n");
350 /* processes a batman packet for all interfaces, adjusts the sequence number and
351 * finds out whether it is a duplicate.
353 * 1 the packet is a duplicate
354 * 0 the packet has not yet been received
355 * -1 the packet is old and has been received while the seqno window
356 * was protected. Caller should drop it.
358 static char count_real_packets(struct ethhdr
*ethhdr
,
359 struct batman_packet
*batman_packet
,
360 struct batman_if
*if_incoming
)
362 struct bat_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
363 struct orig_node
*orig_node
;
364 struct neigh_node
*tmp_neigh_node
;
365 char is_duplicate
= 0;
370 orig_node
= get_orig_node(bat_priv
, batman_packet
->orig
);
371 if (orig_node
== NULL
)
374 seq_diff
= batman_packet
->seqno
- orig_node
->last_real_seqno
;
376 /* signalize caller that the packet is to be dropped. */
377 if (window_protected(bat_priv
, seq_diff
,
378 &orig_node
->batman_seqno_reset
))
381 list_for_each_entry(tmp_neigh_node
, &orig_node
->neigh_list
, list
) {
383 is_duplicate
|= get_bit_status(tmp_neigh_node
->real_bits
,
384 orig_node
->last_real_seqno
,
385 batman_packet
->seqno
);
387 if (compare_orig(tmp_neigh_node
->addr
, ethhdr
->h_source
) &&
388 (tmp_neigh_node
->if_incoming
== if_incoming
))
393 /* if the window moved, set the update flag. */
394 need_update
|= bit_get_packet(bat_priv
,
395 tmp_neigh_node
->real_bits
,
398 tmp_neigh_node
->real_packet_count
=
399 bit_packet_count(tmp_neigh_node
->real_bits
);
403 bat_dbg(DBG_BATMAN
, bat_priv
,
404 "updating last_seqno: old %d, new %d\n",
405 orig_node
->last_real_seqno
, batman_packet
->seqno
);
406 orig_node
->last_real_seqno
= batman_packet
->seqno
;
412 /* copy primary address for bonding */
413 static void mark_bonding_address(struct bat_priv
*bat_priv
,
414 struct orig_node
*orig_node
,
415 struct orig_node
*orig_neigh_node
,
416 struct batman_packet
*batman_packet
)
419 if (batman_packet
->flags
& PRIMARIES_FIRST_HOP
)
420 memcpy(orig_neigh_node
->primary_addr
,
421 orig_node
->orig
, ETH_ALEN
);
426 /* mark possible bond.candidates in the neighbor list */
427 void update_bonding_candidates(struct bat_priv
*bat_priv
,
428 struct orig_node
*orig_node
)
431 int interference_candidate
;
433 struct neigh_node
*tmp_neigh_node
, *tmp_neigh_node2
;
434 struct neigh_node
*first_candidate
, *last_candidate
;
436 /* update the candidates for this originator */
437 if (!orig_node
->router
) {
438 orig_node
->bond
.candidates
= 0;
442 best_tq
= orig_node
->router
->tq_avg
;
444 /* update bond.candidates */
448 /* mark other nodes which also received "PRIMARIES FIRST HOP" packets
449 * as "bonding partner" */
451 /* first, zero the list */
452 list_for_each_entry(tmp_neigh_node
, &orig_node
->neigh_list
, list
) {
453 tmp_neigh_node
->next_bond_candidate
= NULL
;
456 first_candidate
= NULL
;
457 last_candidate
= NULL
;
458 list_for_each_entry(tmp_neigh_node
, &orig_node
->neigh_list
, list
) {
460 /* only consider if it has the same primary address ... */
461 if (memcmp(orig_node
->orig
,
462 tmp_neigh_node
->orig_node
->primary_addr
,
466 /* ... and is good enough to be considered */
467 if (tmp_neigh_node
->tq_avg
< best_tq
- BONDING_TQ_THRESHOLD
)
470 /* check if we have another candidate with the same
471 * mac address or interface. If we do, we won't
472 * select this candidate because of possible interference. */
474 interference_candidate
= 0;
475 list_for_each_entry(tmp_neigh_node2
,
476 &orig_node
->neigh_list
, list
) {
478 if (tmp_neigh_node2
== tmp_neigh_node
)
481 /* we only care if the other candidate is even
482 * considered as candidate. */
483 if (tmp_neigh_node2
->next_bond_candidate
== NULL
)
487 if ((tmp_neigh_node
->if_incoming
==
488 tmp_neigh_node2
->if_incoming
)
489 || (memcmp(tmp_neigh_node
->addr
,
490 tmp_neigh_node2
->addr
, ETH_ALEN
) == 0)) {
492 interference_candidate
= 1;
496 /* don't care further if it is an interference candidate */
497 if (interference_candidate
)
500 if (first_candidate
== NULL
) {
501 first_candidate
= tmp_neigh_node
;
502 tmp_neigh_node
->next_bond_candidate
= first_candidate
;
504 tmp_neigh_node
->next_bond_candidate
= last_candidate
;
506 last_candidate
= tmp_neigh_node
;
511 if (candidates
> 0) {
512 first_candidate
->next_bond_candidate
= last_candidate
;
513 orig_node
->bond
.selected
= first_candidate
;
516 orig_node
->bond
.candidates
= candidates
;
519 void receive_bat_packet(struct ethhdr
*ethhdr
,
520 struct batman_packet
*batman_packet
,
521 unsigned char *hna_buff
, int hna_buff_len
,
522 struct batman_if
*if_incoming
)
524 struct bat_priv
*bat_priv
= netdev_priv(if_incoming
->soft_iface
);
525 struct batman_if
*batman_if
;
526 struct orig_node
*orig_neigh_node
, *orig_node
;
527 char has_directlink_flag
;
528 char is_my_addr
= 0, is_my_orig
= 0, is_my_oldorig
= 0;
529 char is_broadcast
= 0, is_bidirectional
, is_single_hop_neigh
;
531 uint32_t if_incoming_seqno
;
533 /* Silently drop when the batman packet is actually not a
536 * This might happen if a packet is padded (e.g. Ethernet has a
537 * minimum frame length of 64 byte) and the aggregation interprets
538 * it as an additional length.
540 * TODO: A more sane solution would be to have a bit in the
541 * batman_packet to detect whether the packet is the last
542 * packet in an aggregation. Here we expect that the padding
543 * is always zero (or not 0x01)
545 if (batman_packet
->packet_type
!= BAT_PACKET
)
548 /* could be changed by schedule_own_packet() */
549 if_incoming_seqno
= atomic_read(&if_incoming
->seqno
);
551 has_directlink_flag
= (batman_packet
->flags
& DIRECTLINK
? 1 : 0);
553 is_single_hop_neigh
= (compare_orig(ethhdr
->h_source
,
554 batman_packet
->orig
) ? 1 : 0);
556 bat_dbg(DBG_BATMAN
, bat_priv
,
557 "Received BATMAN packet via NB: %pM, IF: %s [%pM] "
558 "(from OG: %pM, via prev OG: %pM, seqno %d, tq %d, "
559 "TTL %d, V %d, IDF %d)\n",
560 ethhdr
->h_source
, if_incoming
->net_dev
->name
,
561 if_incoming
->net_dev
->dev_addr
, batman_packet
->orig
,
562 batman_packet
->prev_sender
, batman_packet
->seqno
,
563 batman_packet
->tq
, batman_packet
->ttl
, batman_packet
->version
,
564 has_directlink_flag
);
567 list_for_each_entry_rcu(batman_if
, &if_list
, list
) {
568 if (batman_if
->if_status
!= IF_ACTIVE
)
571 if (batman_if
->soft_iface
!= if_incoming
->soft_iface
)
574 if (compare_orig(ethhdr
->h_source
,
575 batman_if
->net_dev
->dev_addr
))
578 if (compare_orig(batman_packet
->orig
,
579 batman_if
->net_dev
->dev_addr
))
582 if (compare_orig(batman_packet
->prev_sender
,
583 batman_if
->net_dev
->dev_addr
))
586 if (compare_orig(ethhdr
->h_source
, broadcast_addr
))
591 if (batman_packet
->version
!= COMPAT_VERSION
) {
592 bat_dbg(DBG_BATMAN
, bat_priv
,
593 "Drop packet: incompatible batman version (%i)\n",
594 batman_packet
->version
);
599 bat_dbg(DBG_BATMAN
, bat_priv
,
600 "Drop packet: received my own broadcast (sender: %pM"
607 bat_dbg(DBG_BATMAN
, bat_priv
, "Drop packet: "
608 "ignoring all packets with broadcast source addr (sender: %pM"
609 ")\n", ethhdr
->h_source
);
617 orig_neigh_node
= get_orig_node(bat_priv
, ethhdr
->h_source
);
619 if (!orig_neigh_node
)
622 /* neighbor has to indicate direct link and it has to
623 * come via the corresponding interface */
624 /* if received seqno equals last send seqno save new
625 * seqno for bidirectional check */
626 if (has_directlink_flag
&&
627 compare_orig(if_incoming
->net_dev
->dev_addr
,
628 batman_packet
->orig
) &&
629 (batman_packet
->seqno
- if_incoming_seqno
+ 2 == 0)) {
630 offset
= if_incoming
->if_num
* NUM_WORDS
;
631 word
= &(orig_neigh_node
->bcast_own
[offset
]);
633 orig_neigh_node
->bcast_own_sum
[if_incoming
->if_num
] =
634 bit_packet_count(word
);
637 bat_dbg(DBG_BATMAN
, bat_priv
, "Drop packet: "
638 "originator packet from myself (via neighbor)\n");
643 bat_dbg(DBG_BATMAN
, bat_priv
,
644 "Drop packet: ignoring all rebroadcast echos (sender: "
645 "%pM)\n", ethhdr
->h_source
);
649 orig_node
= get_orig_node(bat_priv
, batman_packet
->orig
);
650 if (orig_node
== NULL
)
653 is_duplicate
= count_real_packets(ethhdr
, batman_packet
, if_incoming
);
655 if (is_duplicate
== -1) {
656 bat_dbg(DBG_BATMAN
, bat_priv
,
657 "Drop packet: packet within seqno protection time "
658 "(sender: %pM)\n", ethhdr
->h_source
);
662 if (batman_packet
->tq
== 0) {
663 bat_dbg(DBG_BATMAN
, bat_priv
,
664 "Drop packet: originator packet with tq equal 0\n");
668 /* avoid temporary routing loops */
669 if ((orig_node
->router
) &&
670 (orig_node
->router
->orig_node
->router
) &&
671 (compare_orig(orig_node
->router
->addr
,
672 batman_packet
->prev_sender
)) &&
673 !(compare_orig(batman_packet
->orig
, batman_packet
->prev_sender
)) &&
674 (compare_orig(orig_node
->router
->addr
,
675 orig_node
->router
->orig_node
->router
->addr
))) {
676 bat_dbg(DBG_BATMAN
, bat_priv
,
677 "Drop packet: ignoring all rebroadcast packets that "
678 "may make me loop (sender: %pM)\n", ethhdr
->h_source
);
682 /* if sender is a direct neighbor the sender mac equals
684 orig_neigh_node
= (is_single_hop_neigh
?
686 get_orig_node(bat_priv
, ethhdr
->h_source
));
687 if (orig_neigh_node
== NULL
)
690 /* drop packet if sender is not a direct neighbor and if we
691 * don't route towards it */
692 if (!is_single_hop_neigh
&&
693 (orig_neigh_node
->router
== NULL
)) {
694 bat_dbg(DBG_BATMAN
, bat_priv
,
695 "Drop packet: OGM via unknown neighbor!\n");
699 is_bidirectional
= is_bidirectional_neigh(orig_node
, orig_neigh_node
,
700 batman_packet
, if_incoming
);
702 /* update ranking if it is not a duplicate or has the same
703 * seqno and similar ttl as the non-duplicate */
704 if (is_bidirectional
&&
706 ((orig_node
->last_real_seqno
== batman_packet
->seqno
) &&
707 (orig_node
->last_ttl
- 3 <= batman_packet
->ttl
))))
708 update_orig(bat_priv
, orig_node
, ethhdr
, batman_packet
,
709 if_incoming
, hna_buff
, hna_buff_len
, is_duplicate
);
711 mark_bonding_address(bat_priv
, orig_node
,
712 orig_neigh_node
, batman_packet
);
713 update_bonding_candidates(bat_priv
, orig_node
);
715 /* is single hop (direct) neighbor */
716 if (is_single_hop_neigh
) {
718 /* mark direct link on incoming interface */
719 schedule_forward_packet(orig_node
, ethhdr
, batman_packet
,
720 1, hna_buff_len
, if_incoming
);
722 bat_dbg(DBG_BATMAN
, bat_priv
, "Forwarding packet: "
723 "rebroadcast neighbor packet with direct link flag\n");
727 /* multihop originator */
728 if (!is_bidirectional
) {
729 bat_dbg(DBG_BATMAN
, bat_priv
,
730 "Drop packet: not received via bidirectional link\n");
735 bat_dbg(DBG_BATMAN
, bat_priv
,
736 "Drop packet: duplicate packet received\n");
740 bat_dbg(DBG_BATMAN
, bat_priv
,
741 "Forwarding packet: rebroadcast originator packet\n");
742 schedule_forward_packet(orig_node
, ethhdr
, batman_packet
,
743 0, hna_buff_len
, if_incoming
);
746 int recv_bat_packet(struct sk_buff
*skb
, struct batman_if
*batman_if
)
748 struct bat_priv
*bat_priv
= netdev_priv(batman_if
->soft_iface
);
749 struct ethhdr
*ethhdr
;
752 /* drop packet if it has not necessary minimum size */
753 if (unlikely(!pskb_may_pull(skb
, sizeof(struct batman_packet
))))
756 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
758 /* packet with broadcast indication but unicast recipient */
759 if (!is_bcast(ethhdr
->h_dest
))
762 /* packet with broadcast sender address */
763 if (is_bcast(ethhdr
->h_source
))
766 /* create a copy of the skb, if needed, to modify it. */
767 if (skb_cow(skb
, 0) < 0)
770 /* keep skb linear */
771 if (skb_linearize(skb
) < 0)
774 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
776 spin_lock_irqsave(&bat_priv
->orig_hash_lock
, flags
);
777 receive_aggr_bat_packet(ethhdr
,
781 spin_unlock_irqrestore(&bat_priv
->orig_hash_lock
, flags
);
784 return NET_RX_SUCCESS
;
787 static int recv_my_icmp_packet(struct bat_priv
*bat_priv
,
788 struct sk_buff
*skb
, size_t icmp_len
)
790 struct orig_node
*orig_node
;
791 struct icmp_packet_rr
*icmp_packet
;
792 struct ethhdr
*ethhdr
;
793 struct batman_if
*batman_if
;
796 uint8_t dstaddr
[ETH_ALEN
];
798 icmp_packet
= (struct icmp_packet_rr
*)skb
->data
;
799 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
801 /* add data to device queue */
802 if (icmp_packet
->msg_type
!= ECHO_REQUEST
) {
803 bat_socket_receive_packet(icmp_packet
, icmp_len
);
807 if (!bat_priv
->primary_if
)
810 /* answer echo request (ping) */
811 /* get routing information */
812 spin_lock_irqsave(&bat_priv
->orig_hash_lock
, flags
);
813 orig_node
= ((struct orig_node
*)hash_find(bat_priv
->orig_hash
,
818 if ((orig_node
!= NULL
) &&
819 (orig_node
->router
!= NULL
)) {
821 /* don't lock while sending the packets ... we therefore
822 * copy the required data before sending */
823 batman_if
= orig_node
->router
->if_incoming
;
824 memcpy(dstaddr
, orig_node
->router
->addr
, ETH_ALEN
);
825 spin_unlock_irqrestore(&bat_priv
->orig_hash_lock
, flags
);
827 /* create a copy of the skb, if needed, to modify it. */
828 if (skb_cow(skb
, sizeof(struct ethhdr
)) < 0)
831 icmp_packet
= (struct icmp_packet_rr
*)skb
->data
;
832 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
834 memcpy(icmp_packet
->dst
, icmp_packet
->orig
, ETH_ALEN
);
835 memcpy(icmp_packet
->orig
,
836 bat_priv
->primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
837 icmp_packet
->msg_type
= ECHO_REPLY
;
838 icmp_packet
->ttl
= TTL
;
840 send_skb_packet(skb
, batman_if
, dstaddr
);
841 ret
= NET_RX_SUCCESS
;
844 spin_unlock_irqrestore(&bat_priv
->orig_hash_lock
, flags
);
849 static int recv_icmp_ttl_exceeded(struct bat_priv
*bat_priv
,
850 struct sk_buff
*skb
, size_t icmp_len
)
852 struct orig_node
*orig_node
;
853 struct icmp_packet
*icmp_packet
;
854 struct ethhdr
*ethhdr
;
855 struct batman_if
*batman_if
;
858 uint8_t dstaddr
[ETH_ALEN
];
860 icmp_packet
= (struct icmp_packet
*)skb
->data
;
861 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
863 /* send TTL exceeded if packet is an echo request (traceroute) */
864 if (icmp_packet
->msg_type
!= ECHO_REQUEST
) {
865 pr_debug("Warning - can't forward icmp packet from %pM to "
866 "%pM: ttl exceeded\n", icmp_packet
->orig
,
871 if (!bat_priv
->primary_if
)
874 /* get routing information */
875 spin_lock_irqsave(&bat_priv
->orig_hash_lock
, flags
);
876 orig_node
= ((struct orig_node
*)
877 hash_find(bat_priv
->orig_hash
, compare_orig
,
881 if ((orig_node
!= NULL
) &&
882 (orig_node
->router
!= NULL
)) {
884 /* don't lock while sending the packets ... we therefore
885 * copy the required data before sending */
886 batman_if
= orig_node
->router
->if_incoming
;
887 memcpy(dstaddr
, orig_node
->router
->addr
, ETH_ALEN
);
888 spin_unlock_irqrestore(&bat_priv
->orig_hash_lock
, flags
);
890 /* create a copy of the skb, if needed, to modify it. */
891 if (skb_cow(skb
, sizeof(struct ethhdr
)) < 0)
894 icmp_packet
= (struct icmp_packet
*) skb
->data
;
895 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
897 memcpy(icmp_packet
->dst
, icmp_packet
->orig
, ETH_ALEN
);
898 memcpy(icmp_packet
->orig
,
899 bat_priv
->primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
900 icmp_packet
->msg_type
= TTL_EXCEEDED
;
901 icmp_packet
->ttl
= TTL
;
903 send_skb_packet(skb
, batman_if
, dstaddr
);
904 ret
= NET_RX_SUCCESS
;
907 spin_unlock_irqrestore(&bat_priv
->orig_hash_lock
, flags
);
913 int recv_icmp_packet(struct sk_buff
*skb
, struct batman_if
*recv_if
)
915 struct bat_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
916 struct icmp_packet_rr
*icmp_packet
;
917 struct ethhdr
*ethhdr
;
918 struct orig_node
*orig_node
;
919 struct batman_if
*batman_if
;
920 int hdr_size
= sizeof(struct icmp_packet
);
923 uint8_t dstaddr
[ETH_ALEN
];
926 * we truncate all incoming icmp packets if they don't match our size
928 if (skb
->len
>= sizeof(struct icmp_packet_rr
))
929 hdr_size
= sizeof(struct icmp_packet_rr
);
931 /* drop packet if it has not necessary minimum size */
932 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
935 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
937 /* packet with unicast indication but broadcast recipient */
938 if (is_bcast(ethhdr
->h_dest
))
941 /* packet with broadcast sender address */
942 if (is_bcast(ethhdr
->h_source
))
946 if (!is_my_mac(ethhdr
->h_dest
))
949 icmp_packet
= (struct icmp_packet_rr
*)skb
->data
;
951 /* add record route information if not full */
952 if ((hdr_size
== sizeof(struct icmp_packet_rr
)) &&
953 (icmp_packet
->rr_cur
< BAT_RR_LEN
)) {
954 memcpy(&(icmp_packet
->rr
[icmp_packet
->rr_cur
]),
955 ethhdr
->h_dest
, ETH_ALEN
);
956 icmp_packet
->rr_cur
++;
960 if (is_my_mac(icmp_packet
->dst
))
961 return recv_my_icmp_packet(bat_priv
, skb
, hdr_size
);
964 if (icmp_packet
->ttl
< 2)
965 return recv_icmp_ttl_exceeded(bat_priv
, skb
, hdr_size
);
969 /* get routing information */
970 spin_lock_irqsave(&bat_priv
->orig_hash_lock
, flags
);
971 orig_node
= ((struct orig_node
*)
972 hash_find(bat_priv
->orig_hash
, compare_orig
,
975 if ((orig_node
!= NULL
) &&
976 (orig_node
->router
!= NULL
)) {
978 /* don't lock while sending the packets ... we therefore
979 * copy the required data before sending */
980 batman_if
= orig_node
->router
->if_incoming
;
981 memcpy(dstaddr
, orig_node
->router
->addr
, ETH_ALEN
);
982 spin_unlock_irqrestore(&bat_priv
->orig_hash_lock
, flags
);
984 /* create a copy of the skb, if needed, to modify it. */
985 if (skb_cow(skb
, sizeof(struct ethhdr
)) < 0)
988 icmp_packet
= (struct icmp_packet_rr
*)skb
->data
;
989 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
995 send_skb_packet(skb
, batman_if
, dstaddr
);
996 ret
= NET_RX_SUCCESS
;
999 spin_unlock_irqrestore(&bat_priv
->orig_hash_lock
, flags
);
1004 /* find a suitable router for this originator, and use
1005 * bonding if possible. */
1006 struct neigh_node
*find_router(struct bat_priv
*bat_priv
,
1007 struct orig_node
*orig_node
,
1008 struct batman_if
*recv_if
)
1010 struct orig_node
*primary_orig_node
;
1011 struct orig_node
*router_orig
;
1012 struct neigh_node
*router
, *first_candidate
, *best_router
;
1013 static uint8_t zero_mac
[ETH_ALEN
] = {0, 0, 0, 0, 0, 0};
1014 int bonding_enabled
;
1019 if (!orig_node
->router
)
1022 /* without bonding, the first node should
1023 * always choose the default router. */
1025 bonding_enabled
= atomic_read(&bat_priv
->bonding
);
1027 if ((!recv_if
) && (!bonding_enabled
))
1028 return orig_node
->router
;
1030 router_orig
= orig_node
->router
->orig_node
;
1032 /* if we have something in the primary_addr, we can search
1033 * for a potential bonding candidate. */
1034 if (memcmp(router_orig
->primary_addr
, zero_mac
, ETH_ALEN
) == 0)
1035 return orig_node
->router
;
1037 /* find the orig_node which has the primary interface. might
1038 * even be the same as our router_orig in many cases */
1040 if (memcmp(router_orig
->primary_addr
,
1041 router_orig
->orig
, ETH_ALEN
) == 0) {
1042 primary_orig_node
= router_orig
;
1044 primary_orig_node
= hash_find(bat_priv
->orig_hash
, compare_orig
,
1045 router_orig
->primary_addr
);
1047 if (!primary_orig_node
)
1048 return orig_node
->router
;
1051 /* with less than 2 candidates, we can't do any
1052 * bonding and prefer the original router. */
1054 if (primary_orig_node
->bond
.candidates
< 2)
1055 return orig_node
->router
;
1058 /* all nodes between should choose a candidate which
1059 * is is not on the interface where the packet came
1061 first_candidate
= primary_orig_node
->bond
.selected
;
1062 router
= first_candidate
;
1064 if (bonding_enabled
) {
1065 /* in the bonding case, send the packets in a round
1066 * robin fashion over the remaining interfaces. */
1068 /* recv_if == NULL on the first node. */
1069 if (router
->if_incoming
!= recv_if
)
1072 router
= router
->next_bond_candidate
;
1073 } while (router
!= first_candidate
);
1075 primary_orig_node
->bond
.selected
= router
->next_bond_candidate
;
1078 /* if bonding is disabled, use the best of the
1079 * remaining candidates which are not using
1080 * this interface. */
1081 best_router
= first_candidate
;
1084 /* recv_if == NULL on the first node. */
1085 if ((router
->if_incoming
!= recv_if
) &&
1086 (router
->tq_avg
> best_router
->tq_avg
))
1087 best_router
= router
;
1089 router
= router
->next_bond_candidate
;
1090 } while (router
!= first_candidate
);
1092 router
= best_router
;
1098 static int check_unicast_packet(struct sk_buff
*skb
, int hdr_size
)
1100 struct ethhdr
*ethhdr
;
1102 /* drop packet if it has not necessary minimum size */
1103 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
1106 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
1108 /* packet with unicast indication but broadcast recipient */
1109 if (is_bcast(ethhdr
->h_dest
))
1112 /* packet with broadcast sender address */
1113 if (is_bcast(ethhdr
->h_source
))
1117 if (!is_my_mac(ethhdr
->h_dest
))
1123 int route_unicast_packet(struct sk_buff
*skb
, struct batman_if
*recv_if
,
1126 struct bat_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1127 struct orig_node
*orig_node
;
1128 struct neigh_node
*router
;
1129 struct batman_if
*batman_if
;
1130 uint8_t dstaddr
[ETH_ALEN
];
1131 unsigned long flags
;
1132 struct unicast_packet
*unicast_packet
;
1133 struct ethhdr
*ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
1135 struct sk_buff
*new_skb
;
1137 unicast_packet
= (struct unicast_packet
*)skb
->data
;
1140 if (unicast_packet
->ttl
< 2) {
1141 pr_debug("Warning - can't forward unicast packet from %pM to "
1142 "%pM: ttl exceeded\n", ethhdr
->h_source
,
1143 unicast_packet
->dest
);
1147 /* get routing information */
1148 spin_lock_irqsave(&bat_priv
->orig_hash_lock
, flags
);
1149 orig_node
= ((struct orig_node
*)
1150 hash_find(bat_priv
->orig_hash
, compare_orig
,
1151 unicast_packet
->dest
));
1153 router
= find_router(bat_priv
, orig_node
, recv_if
);
1156 spin_unlock_irqrestore(&bat_priv
->orig_hash_lock
, flags
);
1160 /* don't lock while sending the packets ... we therefore
1161 * copy the required data before sending */
1163 batman_if
= router
->if_incoming
;
1164 memcpy(dstaddr
, router
->addr
, ETH_ALEN
);
1166 spin_unlock_irqrestore(&bat_priv
->orig_hash_lock
, flags
);
1168 /* create a copy of the skb, if needed, to modify it. */
1169 if (skb_cow(skb
, sizeof(struct ethhdr
)) < 0)
1172 unicast_packet
= (struct unicast_packet
*)skb
->data
;
1174 if (unicast_packet
->packet_type
== BAT_UNICAST
&&
1175 atomic_read(&bat_priv
->fragmentation
) &&
1176 skb
->len
> batman_if
->net_dev
->mtu
)
1177 return frag_send_skb(skb
, bat_priv
, batman_if
,
1180 if (unicast_packet
->packet_type
== BAT_UNICAST_FRAG
&&
1181 2 * skb
->len
- hdr_size
<= batman_if
->net_dev
->mtu
) {
1183 ret
= frag_reassemble_skb(skb
, bat_priv
, &new_skb
);
1185 if (ret
== NET_RX_DROP
)
1188 /* packet was buffered for late merge */
1190 return NET_RX_SUCCESS
;
1193 unicast_packet
= (struct unicast_packet
*)skb
->data
;
1197 unicast_packet
->ttl
--;
1200 send_skb_packet(skb
, batman_if
, dstaddr
);
1202 return NET_RX_SUCCESS
;
1205 int recv_unicast_packet(struct sk_buff
*skb
, struct batman_if
*recv_if
)
1207 struct unicast_packet
*unicast_packet
;
1208 int hdr_size
= sizeof(struct unicast_packet
);
1210 if (check_unicast_packet(skb
, hdr_size
) < 0)
1213 unicast_packet
= (struct unicast_packet
*)skb
->data
;
1216 if (is_my_mac(unicast_packet
->dest
)) {
1217 interface_rx(recv_if
->soft_iface
, skb
, recv_if
, hdr_size
);
1218 return NET_RX_SUCCESS
;
1221 return route_unicast_packet(skb
, recv_if
, hdr_size
);
1224 int recv_ucast_frag_packet(struct sk_buff
*skb
, struct batman_if
*recv_if
)
1226 struct bat_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1227 struct unicast_frag_packet
*unicast_packet
;
1228 int hdr_size
= sizeof(struct unicast_frag_packet
);
1229 struct sk_buff
*new_skb
= NULL
;
1232 if (check_unicast_packet(skb
, hdr_size
) < 0)
1235 unicast_packet
= (struct unicast_frag_packet
*)skb
->data
;
1238 if (is_my_mac(unicast_packet
->dest
)) {
1240 ret
= frag_reassemble_skb(skb
, bat_priv
, &new_skb
);
1242 if (ret
== NET_RX_DROP
)
1245 /* packet was buffered for late merge */
1247 return NET_RX_SUCCESS
;
1249 interface_rx(recv_if
->soft_iface
, new_skb
, recv_if
,
1250 sizeof(struct unicast_packet
));
1251 return NET_RX_SUCCESS
;
1254 return route_unicast_packet(skb
, recv_if
, hdr_size
);
1258 int recv_bcast_packet(struct sk_buff
*skb
, struct batman_if
*recv_if
)
1260 struct bat_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1261 struct orig_node
*orig_node
;
1262 struct bcast_packet
*bcast_packet
;
1263 struct ethhdr
*ethhdr
;
1264 int hdr_size
= sizeof(struct bcast_packet
);
1266 unsigned long flags
;
1268 /* drop packet if it has not necessary minimum size */
1269 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
1272 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
1274 /* packet with broadcast indication but unicast recipient */
1275 if (!is_bcast(ethhdr
->h_dest
))
1278 /* packet with broadcast sender address */
1279 if (is_bcast(ethhdr
->h_source
))
1282 /* ignore broadcasts sent by myself */
1283 if (is_my_mac(ethhdr
->h_source
))
1286 bcast_packet
= (struct bcast_packet
*)skb
->data
;
1288 /* ignore broadcasts originated by myself */
1289 if (is_my_mac(bcast_packet
->orig
))
1292 if (bcast_packet
->ttl
< 2)
1295 spin_lock_irqsave(&bat_priv
->orig_hash_lock
, flags
);
1296 orig_node
= ((struct orig_node
*)
1297 hash_find(bat_priv
->orig_hash
, compare_orig
,
1298 bcast_packet
->orig
));
1300 if (orig_node
== NULL
) {
1301 spin_unlock_irqrestore(&bat_priv
->orig_hash_lock
, flags
);
1305 /* check whether the packet is a duplicate */
1306 if (get_bit_status(orig_node
->bcast_bits
,
1307 orig_node
->last_bcast_seqno
,
1308 ntohl(bcast_packet
->seqno
))) {
1309 spin_unlock_irqrestore(&bat_priv
->orig_hash_lock
, flags
);
1313 seq_diff
= ntohl(bcast_packet
->seqno
) - orig_node
->last_bcast_seqno
;
1315 /* check whether the packet is old and the host just restarted. */
1316 if (window_protected(bat_priv
, seq_diff
,
1317 &orig_node
->bcast_seqno_reset
)) {
1318 spin_unlock_irqrestore(&bat_priv
->orig_hash_lock
, flags
);
1322 /* mark broadcast in flood history, update window position
1324 if (bit_get_packet(bat_priv
, orig_node
->bcast_bits
, seq_diff
, 1))
1325 orig_node
->last_bcast_seqno
= ntohl(bcast_packet
->seqno
);
1327 spin_unlock_irqrestore(&bat_priv
->orig_hash_lock
, flags
);
1328 /* rebroadcast packet */
1329 add_bcast_packet_to_list(bat_priv
, skb
);
1331 /* broadcast for me */
1332 interface_rx(recv_if
->soft_iface
, skb
, recv_if
, hdr_size
);
1334 return NET_RX_SUCCESS
;
1337 int recv_vis_packet(struct sk_buff
*skb
, struct batman_if
*recv_if
)
1339 struct vis_packet
*vis_packet
;
1340 struct ethhdr
*ethhdr
;
1341 struct bat_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1342 int hdr_size
= sizeof(struct vis_packet
);
1344 /* keep skb linear */
1345 if (skb_linearize(skb
) < 0)
1348 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
1351 vis_packet
= (struct vis_packet
*)skb
->data
;
1352 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
1355 if (!is_my_mac(ethhdr
->h_dest
))
1358 /* ignore own packets */
1359 if (is_my_mac(vis_packet
->vis_orig
))
1362 if (is_my_mac(vis_packet
->sender_orig
))
1365 switch (vis_packet
->vis_type
) {
1366 case VIS_TYPE_SERVER_SYNC
:
1367 receive_server_sync_packet(bat_priv
, vis_packet
,
1371 case VIS_TYPE_CLIENT_UPDATE
:
1372 receive_client_update_packet(bat_priv
, vis_packet
,
1376 default: /* ignore unknown packet */
1380 /* We take a copy of the data in the packet, so we should
1381 always free the skbuf. */