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"
36 static DECLARE_WAIT_QUEUE_HEAD(thread_wait
);
38 void slide_own_bcast_window(struct batman_if
*batman_if
)
41 struct orig_node
*orig_node
;
45 spin_lock_irqsave(&orig_hash_lock
, flags
);
47 while (hash_iterate(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(word
, 1, 0);
52 orig_node
->bcast_own_sum
[batman_if
->if_num
] =
53 bit_packet_count(word
);
56 spin_unlock_irqrestore(&orig_hash_lock
, flags
);
59 static void update_HNA(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(orig_node
,
69 "originator changed hna");
71 if ((hna_buff_len
> 0) && (hna_buff
!= NULL
))
72 hna_global_add_orig(orig_node
, hna_buff
, hna_buff_len
);
76 static void update_route(struct orig_node
*orig_node
,
77 struct neigh_node
*neigh_node
,
78 unsigned char *hna_buff
, int hna_buff_len
)
80 /* FIXME: each orig_node->batman_if will be attached to a softif */
81 struct bat_priv
*bat_priv
= netdev_priv(soft_device
);
84 if ((orig_node
->router
!= NULL
) && (neigh_node
== NULL
)) {
86 bat_dbg(DBG_ROUTES
, bat_priv
, "Deleting route towards: %pM\n",
88 hna_global_del_orig(orig_node
, "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(orig_node
, hna_buff
, hna_buff_len
);
100 bat_dbg(DBG_ROUTES
, bat_priv
,
101 "Changing route towards: %pM "
102 "(now via %pM - was via %pM)\n",
103 orig_node
->orig
, neigh_node
->addr
,
104 orig_node
->router
->addr
);
107 orig_node
->router
= neigh_node
;
111 void update_routes(struct orig_node
*orig_node
,
112 struct neigh_node
*neigh_node
,
113 unsigned char *hna_buff
, int hna_buff_len
)
116 if (orig_node
== NULL
)
119 if (orig_node
->router
!= neigh_node
)
120 update_route(orig_node
, neigh_node
, hna_buff
, hna_buff_len
);
121 /* may be just HNA changed */
123 update_HNA(orig_node
, hna_buff
, hna_buff_len
);
126 static int is_bidirectional_neigh(struct orig_node
*orig_node
,
127 struct orig_node
*orig_neigh_node
,
128 struct batman_packet
*batman_packet
,
129 struct batman_if
*if_incoming
)
131 /* FIXME: each orig_node->batman_if will be attached to a softif */
132 struct bat_priv
*bat_priv
= netdev_priv(soft_device
);
133 struct neigh_node
*neigh_node
= NULL
, *tmp_neigh_node
= NULL
;
134 unsigned char total_count
;
136 if (orig_node
== orig_neigh_node
) {
137 list_for_each_entry(tmp_neigh_node
,
138 &orig_node
->neigh_list
,
141 if (compare_orig(tmp_neigh_node
->addr
,
142 orig_neigh_node
->orig
) &&
143 (tmp_neigh_node
->if_incoming
== if_incoming
))
144 neigh_node
= tmp_neigh_node
;
148 neigh_node
= create_neighbor(orig_node
,
150 orig_neigh_node
->orig
,
152 /* create_neighbor failed, return 0 */
156 neigh_node
->last_valid
= jiffies
;
158 /* find packet count of corresponding one hop neighbor */
159 list_for_each_entry(tmp_neigh_node
,
160 &orig_neigh_node
->neigh_list
, list
) {
162 if (compare_orig(tmp_neigh_node
->addr
,
163 orig_neigh_node
->orig
) &&
164 (tmp_neigh_node
->if_incoming
== if_incoming
))
165 neigh_node
= tmp_neigh_node
;
169 neigh_node
= create_neighbor(orig_neigh_node
,
171 orig_neigh_node
->orig
,
173 /* create_neighbor failed, return 0 */
178 orig_node
->last_valid
= jiffies
;
180 /* pay attention to not get a value bigger than 100 % */
181 total_count
= (orig_neigh_node
->bcast_own_sum
[if_incoming
->if_num
] >
182 neigh_node
->real_packet_count
?
183 neigh_node
->real_packet_count
:
184 orig_neigh_node
->bcast_own_sum
[if_incoming
->if_num
]);
186 /* if we have too few packets (too less data) we set tq_own to zero */
187 /* if we receive too few packets it is not considered bidirectional */
188 if ((total_count
< TQ_LOCAL_BIDRECT_SEND_MINIMUM
) ||
189 (neigh_node
->real_packet_count
< TQ_LOCAL_BIDRECT_RECV_MINIMUM
))
190 orig_neigh_node
->tq_own
= 0;
192 /* neigh_node->real_packet_count is never zero as we
193 * only purge old information when getting new
195 orig_neigh_node
->tq_own
= (TQ_MAX_VALUE
* total_count
) /
196 neigh_node
->real_packet_count
;
199 * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
200 * affect the nearly-symmetric links only a little, but
201 * punishes asymmetric links more. This will give a value
202 * between 0 and TQ_MAX_VALUE
204 orig_neigh_node
->tq_asym_penalty
=
207 (TQ_LOCAL_WINDOW_SIZE
- neigh_node
->real_packet_count
) *
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
*
211 TQ_LOCAL_WINDOW_SIZE
*
212 TQ_LOCAL_WINDOW_SIZE
);
214 batman_packet
->tq
= ((batman_packet
->tq
*
215 orig_neigh_node
->tq_own
*
216 orig_neigh_node
->tq_asym_penalty
) /
217 (TQ_MAX_VALUE
* TQ_MAX_VALUE
));
219 bat_dbg(DBG_BATMAN
, bat_priv
,
221 "orig = %-15pM neigh = %-15pM => own_bcast = %2i, "
222 "real recv = %2i, local tq: %3i, asym_penalty: %3i, "
224 orig_node
->orig
, orig_neigh_node
->orig
, total_count
,
225 neigh_node
->real_packet_count
, orig_neigh_node
->tq_own
,
226 orig_neigh_node
->tq_asym_penalty
, batman_packet
->tq
);
228 /* if link has the minimum required transmission quality
229 * consider it bidirectional */
230 if (batman_packet
->tq
>= TQ_TOTAL_BIDRECT_LIMIT
)
236 static void update_orig(struct orig_node
*orig_node
, struct ethhdr
*ethhdr
,
237 struct batman_packet
*batman_packet
,
238 struct batman_if
*if_incoming
,
239 unsigned char *hna_buff
, int hna_buff_len
,
242 /* FIXME: get bat_priv */
243 struct bat_priv
*bat_priv
= netdev_priv(soft_device
);
244 struct neigh_node
*neigh_node
= NULL
, *tmp_neigh_node
= NULL
;
245 int tmp_hna_buff_len
;
247 bat_dbg(DBG_BATMAN
, bat_priv
, "update_originator(): "
248 "Searching and updating originator entry of received packet\n");
250 list_for_each_entry(tmp_neigh_node
, &orig_node
->neigh_list
, list
) {
251 if (compare_orig(tmp_neigh_node
->addr
, ethhdr
->h_source
) &&
252 (tmp_neigh_node
->if_incoming
== if_incoming
)) {
253 neigh_node
= tmp_neigh_node
;
260 ring_buffer_set(tmp_neigh_node
->tq_recv
,
261 &tmp_neigh_node
->tq_index
, 0);
262 tmp_neigh_node
->tq_avg
=
263 ring_buffer_avg(tmp_neigh_node
->tq_recv
);
267 struct orig_node
*orig_tmp
;
269 orig_tmp
= get_orig_node(ethhdr
->h_source
);
273 neigh_node
= create_neighbor(orig_node
,
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(orig_node
, neigh_node
, hna_buff
, tmp_hna_buff_len
);
320 update_routes(orig_node
, orig_node
->router
, hna_buff
, tmp_hna_buff_len
);
323 /* checks whether the host restarted and is in the protection time.
325 * 0 if the packet is to be accepted
326 * 1 if the packet is to be ignored.
328 static int window_protected(int32_t seq_num_diff
,
329 unsigned long *last_reset
)
331 /* FIXME: each orig_node->batman_if will be attached to a softif */
332 struct bat_priv
*bat_priv
= netdev_priv(soft_device
);
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 /* FIXME: each orig_node->batman_if will be attached to a softif */
363 struct bat_priv
*bat_priv
= netdev_priv(soft_device
);
364 struct orig_node
*orig_node
;
365 struct neigh_node
*tmp_neigh_node
;
366 char is_duplicate
= 0;
371 orig_node
= get_orig_node(batman_packet
->orig
);
372 if (orig_node
== NULL
)
375 seq_diff
= batman_packet
->seqno
- orig_node
->last_real_seqno
;
377 /* signalize caller that the packet is to be dropped. */
378 if (window_protected(seq_diff
, &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(tmp_neigh_node
->real_bits
,
397 tmp_neigh_node
->real_packet_count
=
398 bit_packet_count(tmp_neigh_node
->real_bits
);
402 bat_dbg(DBG_BATMAN
, bat_priv
,
403 "updating last_seqno: old %d, new %d\n",
404 orig_node
->last_real_seqno
, batman_packet
->seqno
);
405 orig_node
->last_real_seqno
= batman_packet
->seqno
;
411 /* copy primary address for bonding */
412 static void mark_bonding_address(struct bat_priv
*bat_priv
,
413 struct orig_node
*orig_node
,
414 struct orig_node
*orig_neigh_node
,
415 struct batman_packet
*batman_packet
)
418 if (batman_packet
->flags
& PRIMARIES_FIRST_HOP
)
419 memcpy(orig_neigh_node
->primary_addr
,
420 orig_node
->orig
, ETH_ALEN
);
425 /* mark possible bond.candidates in the neighbor list */
426 void update_bonding_candidates(struct bat_priv
*bat_priv
,
427 struct orig_node
*orig_node
)
430 int interference_candidate
;
432 struct neigh_node
*tmp_neigh_node
, *tmp_neigh_node2
;
433 struct neigh_node
*first_candidate
, *last_candidate
;
435 /* update the candidates for this originator */
436 if (!orig_node
->router
) {
437 orig_node
->bond
.candidates
= 0;
441 best_tq
= orig_node
->router
->tq_avg
;
443 /* update bond.candidates */
447 /* mark other nodes which also received "PRIMARIES FIRST HOP" packets
448 * as "bonding partner" */
450 /* first, zero the list */
451 list_for_each_entry(tmp_neigh_node
, &orig_node
->neigh_list
, list
) {
452 tmp_neigh_node
->next_bond_candidate
= NULL
;
455 first_candidate
= NULL
;
456 last_candidate
= NULL
;
457 list_for_each_entry(tmp_neigh_node
, &orig_node
->neigh_list
, list
) {
459 /* only consider if it has the same primary address ... */
460 if (memcmp(orig_node
->orig
,
461 tmp_neigh_node
->orig_node
->primary_addr
,
465 /* ... and is good enough to be considered */
466 if (tmp_neigh_node
->tq_avg
< best_tq
- BONDING_TQ_THRESHOLD
)
469 /* check if we have another candidate with the same
470 * mac address or interface. If we do, we won't
471 * select this candidate because of possible interference. */
473 interference_candidate
= 0;
474 list_for_each_entry(tmp_neigh_node2
,
475 &orig_node
->neigh_list
, list
) {
477 if (tmp_neigh_node2
== tmp_neigh_node
)
480 /* we only care if the other candidate is even
481 * considered as candidate. */
482 if (tmp_neigh_node2
->next_bond_candidate
== NULL
)
486 if ((tmp_neigh_node
->if_incoming
==
487 tmp_neigh_node2
->if_incoming
)
488 || (memcmp(tmp_neigh_node
->addr
,
489 tmp_neigh_node2
->addr
, ETH_ALEN
) == 0)) {
491 interference_candidate
= 1;
495 /* don't care further if it is an interference candidate */
496 if (interference_candidate
)
499 if (first_candidate
== NULL
) {
500 first_candidate
= tmp_neigh_node
;
501 tmp_neigh_node
->next_bond_candidate
= first_candidate
;
503 tmp_neigh_node
->next_bond_candidate
= last_candidate
;
505 last_candidate
= tmp_neigh_node
;
510 if (candidates
> 0) {
511 first_candidate
->next_bond_candidate
= last_candidate
;
512 orig_node
->bond
.selected
= first_candidate
;
515 orig_node
->bond
.candidates
= candidates
;
518 void receive_bat_packet(struct ethhdr
*ethhdr
,
519 struct batman_packet
*batman_packet
,
520 unsigned char *hna_buff
, int hna_buff_len
,
521 struct batman_if
*if_incoming
)
523 /* FIXME: each orig_node->batman_if will be attached to a softif */
524 struct bat_priv
*bat_priv
= netdev_priv(soft_device
);
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 [%s] "
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
->dev
, if_incoming
->addr_str
,
561 batman_packet
->orig
, batman_packet
->prev_sender
,
562 batman_packet
->seqno
, batman_packet
->tq
, batman_packet
->ttl
,
563 batman_packet
->version
, has_directlink_flag
);
565 list_for_each_entry_rcu(batman_if
, &if_list
, list
) {
566 if (batman_if
->if_status
!= IF_ACTIVE
)
569 if (compare_orig(ethhdr
->h_source
,
570 batman_if
->net_dev
->dev_addr
))
573 if (compare_orig(batman_packet
->orig
,
574 batman_if
->net_dev
->dev_addr
))
577 if (compare_orig(batman_packet
->prev_sender
,
578 batman_if
->net_dev
->dev_addr
))
581 if (compare_orig(ethhdr
->h_source
, broadcast_addr
))
585 if (batman_packet
->version
!= COMPAT_VERSION
) {
586 bat_dbg(DBG_BATMAN
, bat_priv
,
587 "Drop packet: incompatible batman version (%i)\n",
588 batman_packet
->version
);
593 bat_dbg(DBG_BATMAN
, bat_priv
,
594 "Drop packet: received my own broadcast (sender: %pM"
601 bat_dbg(DBG_BATMAN
, bat_priv
, "Drop packet: "
602 "ignoring all packets with broadcast source addr (sender: %pM"
603 ")\n", ethhdr
->h_source
);
611 orig_neigh_node
= get_orig_node(ethhdr
->h_source
);
613 if (!orig_neigh_node
)
616 /* neighbor has to indicate direct link and it has to
617 * come via the corresponding interface */
618 /* if received seqno equals last send seqno save new
619 * seqno for bidirectional check */
620 if (has_directlink_flag
&&
621 compare_orig(if_incoming
->net_dev
->dev_addr
,
622 batman_packet
->orig
) &&
623 (batman_packet
->seqno
- if_incoming_seqno
+ 2 == 0)) {
624 offset
= if_incoming
->if_num
* NUM_WORDS
;
625 word
= &(orig_neigh_node
->bcast_own
[offset
]);
627 orig_neigh_node
->bcast_own_sum
[if_incoming
->if_num
] =
628 bit_packet_count(word
);
631 bat_dbg(DBG_BATMAN
, bat_priv
, "Drop packet: "
632 "originator packet from myself (via neighbor)\n");
637 bat_dbg(DBG_BATMAN
, bat_priv
,
638 "Drop packet: ignoring all rebroadcast echos (sender: "
639 "%pM)\n", ethhdr
->h_source
);
643 orig_node
= get_orig_node(batman_packet
->orig
);
644 if (orig_node
== NULL
)
647 is_duplicate
= count_real_packets(ethhdr
, batman_packet
, if_incoming
);
649 if (is_duplicate
== -1) {
650 bat_dbg(DBG_BATMAN
, bat_priv
,
651 "Drop packet: packet within seqno protection time "
652 "(sender: %pM)\n", ethhdr
->h_source
);
656 if (batman_packet
->tq
== 0) {
657 bat_dbg(DBG_BATMAN
, bat_priv
,
658 "Drop packet: originator packet with tq equal 0\n");
662 /* avoid temporary routing loops */
663 if ((orig_node
->router
) &&
664 (orig_node
->router
->orig_node
->router
) &&
665 (compare_orig(orig_node
->router
->addr
,
666 batman_packet
->prev_sender
)) &&
667 !(compare_orig(batman_packet
->orig
, batman_packet
->prev_sender
)) &&
668 (compare_orig(orig_node
->router
->addr
,
669 orig_node
->router
->orig_node
->router
->addr
))) {
670 bat_dbg(DBG_BATMAN
, bat_priv
,
671 "Drop packet: ignoring all rebroadcast packets that "
672 "may make me loop (sender: %pM)\n", ethhdr
->h_source
);
676 /* if sender is a direct neighbor the sender mac equals
678 orig_neigh_node
= (is_single_hop_neigh
?
679 orig_node
: get_orig_node(ethhdr
->h_source
));
680 if (orig_neigh_node
== NULL
)
683 /* drop packet if sender is not a direct neighbor and if we
684 * don't route towards it */
685 if (!is_single_hop_neigh
&&
686 (orig_neigh_node
->router
== NULL
)) {
687 bat_dbg(DBG_BATMAN
, bat_priv
,
688 "Drop packet: OGM via unknown neighbor!\n");
692 is_bidirectional
= is_bidirectional_neigh(orig_node
, orig_neigh_node
,
693 batman_packet
, if_incoming
);
695 /* update ranking if it is not a duplicate or has the same
696 * seqno and similar ttl as the non-duplicate */
697 if (is_bidirectional
&&
699 ((orig_node
->last_real_seqno
== batman_packet
->seqno
) &&
700 (orig_node
->last_ttl
- 3 <= batman_packet
->ttl
))))
701 update_orig(orig_node
, ethhdr
, batman_packet
,
702 if_incoming
, hna_buff
, hna_buff_len
, is_duplicate
);
704 mark_bonding_address(bat_priv
, orig_node
,
705 orig_neigh_node
, batman_packet
);
706 update_bonding_candidates(bat_priv
, orig_node
);
708 /* is single hop (direct) neighbor */
709 if (is_single_hop_neigh
) {
711 /* mark direct link on incoming interface */
712 schedule_forward_packet(orig_node
, ethhdr
, batman_packet
,
713 1, hna_buff_len
, if_incoming
);
715 bat_dbg(DBG_BATMAN
, bat_priv
, "Forwarding packet: "
716 "rebroadcast neighbor packet with direct link flag\n");
720 /* multihop originator */
721 if (!is_bidirectional
) {
722 bat_dbg(DBG_BATMAN
, bat_priv
,
723 "Drop packet: not received via bidirectional link\n");
728 bat_dbg(DBG_BATMAN
, bat_priv
,
729 "Drop packet: duplicate packet received\n");
733 bat_dbg(DBG_BATMAN
, bat_priv
,
734 "Forwarding packet: rebroadcast originator packet\n");
735 schedule_forward_packet(orig_node
, ethhdr
, batman_packet
,
736 0, hna_buff_len
, if_incoming
);
739 int recv_bat_packet(struct sk_buff
*skb
,
740 struct batman_if
*batman_if
)
742 struct ethhdr
*ethhdr
;
744 struct sk_buff
*skb_old
;
746 /* drop packet if it has not necessary minimum size */
747 if (skb_headlen(skb
) < sizeof(struct batman_packet
))
750 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
752 /* packet with broadcast indication but unicast recipient */
753 if (!is_bcast(ethhdr
->h_dest
))
756 /* packet with broadcast sender address */
757 if (is_bcast(ethhdr
->h_source
))
760 /* TODO: we use headlen instead of "length", because
761 * only this data is paged in. */
763 /* create a copy of the skb, if needed, to modify it. */
764 if (!skb_clone_writable(skb
, skb_headlen(skb
))) {
766 skb
= skb_copy(skb
, GFP_ATOMIC
);
769 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
773 spin_lock_irqsave(&orig_hash_lock
, flags
);
774 receive_aggr_bat_packet(ethhdr
,
778 spin_unlock_irqrestore(&orig_hash_lock
, flags
);
781 return NET_RX_SUCCESS
;
784 static int recv_my_icmp_packet(struct sk_buff
*skb
, size_t icmp_len
)
786 struct orig_node
*orig_node
;
787 struct icmp_packet_rr
*icmp_packet
;
788 struct ethhdr
*ethhdr
;
789 struct sk_buff
*skb_old
;
790 struct batman_if
*batman_if
;
793 uint8_t dstaddr
[ETH_ALEN
];
795 icmp_packet
= (struct icmp_packet_rr
*)skb
->data
;
796 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
798 /* add data to device queue */
799 if (icmp_packet
->msg_type
!= ECHO_REQUEST
) {
800 bat_socket_receive_packet(icmp_packet
, icmp_len
);
804 /* answer echo request (ping) */
805 /* get routing information */
806 spin_lock_irqsave(&orig_hash_lock
, flags
);
807 orig_node
= ((struct orig_node
*)hash_find(orig_hash
,
811 if ((orig_node
!= NULL
) &&
812 (orig_node
->router
!= NULL
)) {
814 /* don't lock while sending the packets ... we therefore
815 * copy the required data before sending */
816 batman_if
= orig_node
->router
->if_incoming
;
817 memcpy(dstaddr
, orig_node
->router
->addr
, ETH_ALEN
);
818 spin_unlock_irqrestore(&orig_hash_lock
, flags
);
820 /* create a copy of the skb, if needed, to modify it. */
822 if (!skb_clone_writable(skb
, icmp_len
)) {
824 skb
= skb_copy(skb
, GFP_ATOMIC
);
827 icmp_packet
= (struct icmp_packet_rr
*)skb
->data
;
828 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
832 memcpy(icmp_packet
->dst
, icmp_packet
->orig
, ETH_ALEN
);
833 memcpy(icmp_packet
->orig
, ethhdr
->h_dest
, ETH_ALEN
);
834 icmp_packet
->msg_type
= ECHO_REPLY
;
835 icmp_packet
->ttl
= TTL
;
837 send_skb_packet(skb
, batman_if
, dstaddr
);
838 ret
= NET_RX_SUCCESS
;
841 spin_unlock_irqrestore(&orig_hash_lock
, flags
);
846 static int recv_icmp_ttl_exceeded(struct sk_buff
*skb
, size_t icmp_len
)
848 struct orig_node
*orig_node
;
849 struct icmp_packet
*icmp_packet
;
850 struct ethhdr
*ethhdr
;
851 struct sk_buff
*skb_old
;
852 struct batman_if
*batman_if
;
855 uint8_t dstaddr
[ETH_ALEN
];
857 icmp_packet
= (struct icmp_packet
*)skb
->data
;
858 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
860 /* send TTL exceeded if packet is an echo request (traceroute) */
861 if (icmp_packet
->msg_type
!= ECHO_REQUEST
) {
862 pr_warning("Warning - can't forward icmp packet from %pM to "
863 "%pM: ttl exceeded\n", icmp_packet
->orig
,
868 /* get routing information */
869 spin_lock_irqsave(&orig_hash_lock
, flags
);
870 orig_node
= ((struct orig_node
*)
871 hash_find(orig_hash
, icmp_packet
->orig
));
874 if ((orig_node
!= NULL
) &&
875 (orig_node
->router
!= NULL
)) {
877 /* don't lock while sending the packets ... we therefore
878 * copy the required data before sending */
879 batman_if
= orig_node
->router
->if_incoming
;
880 memcpy(dstaddr
, orig_node
->router
->addr
, ETH_ALEN
);
881 spin_unlock_irqrestore(&orig_hash_lock
, flags
);
883 /* create a copy of the skb, if needed, to modify it. */
884 if (!skb_clone_writable(skb
, icmp_len
)) {
886 skb
= skb_copy(skb
, GFP_ATOMIC
);
889 icmp_packet
= (struct icmp_packet
*) skb
->data
;
890 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
894 memcpy(icmp_packet
->dst
, icmp_packet
->orig
, ETH_ALEN
);
895 memcpy(icmp_packet
->orig
, ethhdr
->h_dest
, ETH_ALEN
);
896 icmp_packet
->msg_type
= TTL_EXCEEDED
;
897 icmp_packet
->ttl
= TTL
;
899 send_skb_packet(skb
, batman_if
, dstaddr
);
900 ret
= NET_RX_SUCCESS
;
903 spin_unlock_irqrestore(&orig_hash_lock
, flags
);
909 int recv_icmp_packet(struct sk_buff
*skb
)
911 struct icmp_packet_rr
*icmp_packet
;
912 struct ethhdr
*ethhdr
;
913 struct orig_node
*orig_node
;
914 struct sk_buff
*skb_old
;
915 struct batman_if
*batman_if
;
916 int hdr_size
= sizeof(struct icmp_packet
);
919 uint8_t dstaddr
[ETH_ALEN
];
922 * we truncate all incoming icmp packets if they don't match our size
924 if (skb_headlen(skb
) >= sizeof(struct icmp_packet_rr
))
925 hdr_size
= sizeof(struct icmp_packet_rr
);
927 /* drop packet if it has not necessary minimum size */
928 if (skb_headlen(skb
) < hdr_size
)
931 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
933 /* packet with unicast indication but broadcast recipient */
934 if (is_bcast(ethhdr
->h_dest
))
937 /* packet with broadcast sender address */
938 if (is_bcast(ethhdr
->h_source
))
942 if (!is_my_mac(ethhdr
->h_dest
))
945 icmp_packet
= (struct icmp_packet_rr
*)skb
->data
;
947 /* add record route information if not full */
948 if ((hdr_size
== sizeof(struct icmp_packet_rr
)) &&
949 (icmp_packet
->rr_cur
< BAT_RR_LEN
)) {
950 memcpy(&(icmp_packet
->rr
[icmp_packet
->rr_cur
]),
951 ethhdr
->h_dest
, ETH_ALEN
);
952 icmp_packet
->rr_cur
++;
956 if (is_my_mac(icmp_packet
->dst
))
957 return recv_my_icmp_packet(skb
, hdr_size
);
960 if (icmp_packet
->ttl
< 2)
961 return recv_icmp_ttl_exceeded(skb
, hdr_size
);
965 /* get routing information */
966 spin_lock_irqsave(&orig_hash_lock
, flags
);
967 orig_node
= ((struct orig_node
*)
968 hash_find(orig_hash
, icmp_packet
->dst
));
970 if ((orig_node
!= NULL
) &&
971 (orig_node
->router
!= NULL
)) {
973 /* don't lock while sending the packets ... we therefore
974 * copy the required data before sending */
975 batman_if
= orig_node
->router
->if_incoming
;
976 memcpy(dstaddr
, orig_node
->router
->addr
, ETH_ALEN
);
977 spin_unlock_irqrestore(&orig_hash_lock
, flags
);
979 /* create a copy of the skb, if needed, to modify it. */
980 if (!skb_clone_writable(skb
, hdr_size
)) {
982 skb
= skb_copy(skb
, GFP_ATOMIC
);
985 icmp_packet
= (struct icmp_packet_rr
*)skb
->data
;
986 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
994 send_skb_packet(skb
, batman_if
, dstaddr
);
995 ret
= NET_RX_SUCCESS
;
998 spin_unlock_irqrestore(&orig_hash_lock
, flags
);
1003 /* find a suitable router for this originator, and use
1004 * bonding if possible. */
1005 struct neigh_node
*find_router(struct orig_node
*orig_node
,
1006 struct batman_if
*recv_if
)
1008 /* FIXME: each orig_node->batman_if will be attached to a softif */
1009 struct bat_priv
*bat_priv
= netdev_priv(soft_device
);
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_enabled
);
1026 if (!bonding_enabled
&& (recv_if
== NULL
))
1027 return orig_node
->router
;
1029 router_orig
= orig_node
->router
->orig_node
;
1031 /* if we have something in the primary_addr, we can search
1032 * for a potential bonding candidate. */
1033 if (memcmp(router_orig
->primary_addr
, zero_mac
, ETH_ALEN
) == 0)
1034 return orig_node
->router
;
1036 /* find the orig_node which has the primary interface. might
1037 * even be the same as our router_orig in many cases */
1039 if (memcmp(router_orig
->primary_addr
,
1040 router_orig
->orig
, ETH_ALEN
) == 0) {
1041 primary_orig_node
= router_orig
;
1043 primary_orig_node
= hash_find(orig_hash
,
1044 router_orig
->primary_addr
);
1045 if (!primary_orig_node
)
1046 return orig_node
->router
;
1049 /* with less than 2 candidates, we can't do any
1050 * bonding and prefer the original router. */
1052 if (primary_orig_node
->bond
.candidates
< 2)
1053 return orig_node
->router
;
1056 /* all nodes between should choose a candidate which
1057 * is is not on the interface where the packet came
1059 first_candidate
= primary_orig_node
->bond
.selected
;
1060 router
= first_candidate
;
1062 if (bonding_enabled
) {
1063 /* in the bonding case, send the packets in a round
1064 * robin fashion over the remaining interfaces. */
1066 /* recv_if == NULL on the first node. */
1067 if (router
->if_incoming
!= recv_if
)
1070 router
= router
->next_bond_candidate
;
1071 } while (router
!= first_candidate
);
1073 primary_orig_node
->bond
.selected
= router
->next_bond_candidate
;
1076 /* if bonding is disabled, use the best of the
1077 * remaining candidates which are not using
1078 * this interface. */
1079 best_router
= first_candidate
;
1082 /* recv_if == NULL on the first node. */
1083 if ((router
->if_incoming
!= recv_if
) &&
1084 (router
->tq_avg
> best_router
->tq_avg
))
1085 best_router
= router
;
1087 router
= router
->next_bond_candidate
;
1088 } while (router
!= first_candidate
);
1090 router
= best_router
;
1096 int recv_unicast_packet(struct sk_buff
*skb
, struct batman_if
*recv_if
)
1098 struct unicast_packet
*unicast_packet
;
1099 struct orig_node
*orig_node
;
1100 struct neigh_node
*router
;
1101 struct ethhdr
*ethhdr
;
1102 struct batman_if
*batman_if
;
1103 struct sk_buff
*skb_old
;
1104 uint8_t dstaddr
[ETH_ALEN
];
1105 int hdr_size
= sizeof(struct unicast_packet
);
1106 unsigned long flags
;
1108 /* drop packet if it has not necessary minimum size */
1109 if (skb_headlen(skb
) < hdr_size
)
1112 ethhdr
= (struct ethhdr
*) skb_mac_header(skb
);
1114 /* packet with unicast indication but broadcast recipient */
1115 if (is_bcast(ethhdr
->h_dest
))
1118 /* packet with broadcast sender address */
1119 if (is_bcast(ethhdr
->h_source
))
1123 if (!is_my_mac(ethhdr
->h_dest
))
1126 unicast_packet
= (struct unicast_packet
*) skb
->data
;
1129 if (is_my_mac(unicast_packet
->dest
)) {
1130 interface_rx(skb
, hdr_size
);
1131 return NET_RX_SUCCESS
;
1135 if (unicast_packet
->ttl
< 2) {
1136 pr_warning("Warning - can't forward unicast packet from %pM to "
1137 "%pM: ttl exceeded\n", ethhdr
->h_source
,
1138 unicast_packet
->dest
);
1142 /* get routing information */
1143 spin_lock_irqsave(&orig_hash_lock
, flags
);
1144 orig_node
= ((struct orig_node
*)
1145 hash_find(orig_hash
, unicast_packet
->dest
));
1147 router
= find_router(orig_node
, recv_if
);
1150 spin_unlock_irqrestore(&orig_hash_lock
, flags
);
1154 /* don't lock while sending the packets ... we therefore
1155 * copy the required data before sending */
1157 batman_if
= router
->if_incoming
;
1158 memcpy(dstaddr
, router
->addr
, ETH_ALEN
);
1160 spin_unlock_irqrestore(&orig_hash_lock
, flags
);
1162 /* create a copy of the skb, if needed, to modify it. */
1163 if (!skb_clone_writable(skb
, sizeof(struct unicast_packet
))) {
1165 skb
= skb_copy(skb
, GFP_ATOMIC
);
1168 unicast_packet
= (struct unicast_packet
*) skb
->data
;
1169 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
1174 unicast_packet
->ttl
--;
1177 send_skb_packet(skb
, batman_if
, dstaddr
);
1179 return NET_RX_SUCCESS
;
1182 int recv_bcast_packet(struct sk_buff
*skb
)
1184 struct orig_node
*orig_node
;
1185 struct bcast_packet
*bcast_packet
;
1186 struct ethhdr
*ethhdr
;
1187 int hdr_size
= sizeof(struct bcast_packet
);
1189 unsigned long flags
;
1191 /* drop packet if it has not necessary minimum size */
1192 if (skb_headlen(skb
) < hdr_size
)
1195 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
1197 /* packet with broadcast indication but unicast recipient */
1198 if (!is_bcast(ethhdr
->h_dest
))
1201 /* packet with broadcast sender address */
1202 if (is_bcast(ethhdr
->h_source
))
1205 /* ignore broadcasts sent by myself */
1206 if (is_my_mac(ethhdr
->h_source
))
1209 bcast_packet
= (struct bcast_packet
*)skb
->data
;
1211 /* ignore broadcasts originated by myself */
1212 if (is_my_mac(bcast_packet
->orig
))
1215 if (bcast_packet
->ttl
< 2)
1218 spin_lock_irqsave(&orig_hash_lock
, flags
);
1219 orig_node
= ((struct orig_node
*)
1220 hash_find(orig_hash
, bcast_packet
->orig
));
1222 if (orig_node
== NULL
) {
1223 spin_unlock_irqrestore(&orig_hash_lock
, flags
);
1227 /* check whether the packet is a duplicate */
1228 if (get_bit_status(orig_node
->bcast_bits
,
1229 orig_node
->last_bcast_seqno
,
1230 ntohl(bcast_packet
->seqno
))) {
1231 spin_unlock_irqrestore(&orig_hash_lock
, flags
);
1235 seq_diff
= ntohl(bcast_packet
->seqno
) - orig_node
->last_bcast_seqno
;
1237 /* check whether the packet is old and the host just restarted. */
1238 if (window_protected(seq_diff
, &orig_node
->bcast_seqno_reset
)) {
1239 spin_unlock_irqrestore(&orig_hash_lock
, flags
);
1243 /* mark broadcast in flood history, update window position
1245 if (bit_get_packet(orig_node
->bcast_bits
, seq_diff
, 1))
1246 orig_node
->last_bcast_seqno
= ntohl(bcast_packet
->seqno
);
1248 spin_unlock_irqrestore(&orig_hash_lock
, flags
);
1249 /* rebroadcast packet */
1250 add_bcast_packet_to_list(skb
);
1252 /* broadcast for me */
1253 interface_rx(skb
, hdr_size
);
1255 return NET_RX_SUCCESS
;
1258 int recv_vis_packet(struct sk_buff
*skb
)
1260 struct vis_packet
*vis_packet
;
1261 struct ethhdr
*ethhdr
;
1262 struct bat_priv
*bat_priv
;
1263 int hdr_size
= sizeof(struct vis_packet
);
1265 if (skb_headlen(skb
) < hdr_size
)
1268 vis_packet
= (struct vis_packet
*) skb
->data
;
1269 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
1272 if (!is_my_mac(ethhdr
->h_dest
))
1275 /* ignore own packets */
1276 if (is_my_mac(vis_packet
->vis_orig
))
1279 if (is_my_mac(vis_packet
->sender_orig
))
1282 /* FIXME: each batman_if will be attached to a softif */
1283 bat_priv
= netdev_priv(soft_device
);
1285 switch (vis_packet
->vis_type
) {
1286 case VIS_TYPE_SERVER_SYNC
:
1287 /* TODO: handle fragmented skbs properly */
1288 receive_server_sync_packet(bat_priv
, vis_packet
,
1292 case VIS_TYPE_CLIENT_UPDATE
:
1293 /* TODO: handle fragmented skbs properly */
1294 receive_client_update_packet(bat_priv
, vis_packet
,
1298 default: /* ignore unknown packet */
1302 /* We take a copy of the data in the packet, so we should
1303 always free the skbuf. */