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 [%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 (batman_if->soft_iface != if_incoming->soft_iface)
572 if (compare_orig(ethhdr->h_source,
573 batman_if->net_dev->dev_addr))
576 if (compare_orig(batman_packet->orig,
577 batman_if->net_dev->dev_addr))
580 if (compare_orig(batman_packet->prev_sender,
581 batman_if->net_dev->dev_addr))
584 if (compare_orig(ethhdr->h_source, broadcast_addr))
588 if (batman_packet->version != COMPAT_VERSION) {
589 bat_dbg(DBG_BATMAN, bat_priv,
590 "Drop packet: incompatible batman version (%i)\n",
591 batman_packet->version);
596 bat_dbg(DBG_BATMAN, bat_priv,
597 "Drop packet: received my own broadcast (sender: %pM"
604 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
605 "ignoring all packets with broadcast source addr (sender: %pM"
606 ")\n", ethhdr->h_source);
614 orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source);
616 if (!orig_neigh_node)
619 /* neighbor has to indicate direct link and it has to
620 * come via the corresponding interface */
621 /* if received seqno equals last send seqno save new
622 * seqno for bidirectional check */
623 if (has_directlink_flag &&
624 compare_orig(if_incoming->net_dev->dev_addr,
625 batman_packet->orig) &&
626 (batman_packet->seqno - if_incoming_seqno + 2 == 0)) {
627 offset = if_incoming->if_num * NUM_WORDS;
628 word = &(orig_neigh_node->bcast_own[offset]);
630 orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
631 bit_packet_count(word);
634 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
635 "originator packet from myself (via neighbor)\n");
640 bat_dbg(DBG_BATMAN, bat_priv,
641 "Drop packet: ignoring all rebroadcast echos (sender: "
642 "%pM)\n", ethhdr->h_source);
646 orig_node = get_orig_node(bat_priv, batman_packet->orig);
647 if (orig_node == NULL)
650 is_duplicate = count_real_packets(ethhdr, batman_packet, if_incoming);
652 if (is_duplicate == -1) {
653 bat_dbg(DBG_BATMAN, bat_priv,
654 "Drop packet: packet within seqno protection time "
655 "(sender: %pM)\n", ethhdr->h_source);
659 if (batman_packet->tq == 0) {
660 bat_dbg(DBG_BATMAN, bat_priv,
661 "Drop packet: originator packet with tq equal 0\n");
665 /* avoid temporary routing loops */
666 if ((orig_node->router) &&
667 (orig_node->router->orig_node->router) &&
668 (compare_orig(orig_node->router->addr,
669 batman_packet->prev_sender)) &&
670 !(compare_orig(batman_packet->orig, batman_packet->prev_sender)) &&
671 (compare_orig(orig_node->router->addr,
672 orig_node->router->orig_node->router->addr))) {
673 bat_dbg(DBG_BATMAN, bat_priv,
674 "Drop packet: ignoring all rebroadcast packets that "
675 "may make me loop (sender: %pM)\n", ethhdr->h_source);
679 /* if sender is a direct neighbor the sender mac equals
681 orig_neigh_node = (is_single_hop_neigh ?
683 get_orig_node(bat_priv, ethhdr->h_source));
684 if (orig_neigh_node == NULL)
687 /* drop packet if sender is not a direct neighbor and if we
688 * don't route towards it */
689 if (!is_single_hop_neigh &&
690 (orig_neigh_node->router == NULL)) {
691 bat_dbg(DBG_BATMAN, bat_priv,
692 "Drop packet: OGM via unknown neighbor!\n");
696 is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node,
697 batman_packet, if_incoming);
699 /* update ranking if it is not a duplicate or has the same
700 * seqno and similar ttl as the non-duplicate */
701 if (is_bidirectional &&
703 ((orig_node->last_real_seqno == batman_packet->seqno) &&
704 (orig_node->last_ttl - 3 <= batman_packet->ttl))))
705 update_orig(bat_priv, orig_node, ethhdr, batman_packet,
706 if_incoming, hna_buff, hna_buff_len, is_duplicate);
708 mark_bonding_address(bat_priv, orig_node,
709 orig_neigh_node, batman_packet);
710 update_bonding_candidates(bat_priv, orig_node);
712 /* is single hop (direct) neighbor */
713 if (is_single_hop_neigh) {
715 /* mark direct link on incoming interface */
716 schedule_forward_packet(orig_node, ethhdr, batman_packet,
717 1, hna_buff_len, if_incoming);
719 bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: "
720 "rebroadcast neighbor packet with direct link flag\n");
724 /* multihop originator */
725 if (!is_bidirectional) {
726 bat_dbg(DBG_BATMAN, bat_priv,
727 "Drop packet: not received via bidirectional link\n");
732 bat_dbg(DBG_BATMAN, bat_priv,
733 "Drop packet: duplicate packet received\n");
737 bat_dbg(DBG_BATMAN, bat_priv,
738 "Forwarding packet: rebroadcast originator packet\n");
739 schedule_forward_packet(orig_node, ethhdr, batman_packet,
740 0, hna_buff_len, if_incoming);
743 int recv_bat_packet(struct sk_buff *skb, struct batman_if *batman_if)
745 struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
746 struct ethhdr *ethhdr;
749 /* drop packet if it has not necessary minimum size */
750 if (unlikely(!pskb_may_pull(skb, sizeof(struct batman_packet))))
753 ethhdr = (struct ethhdr *)skb_mac_header(skb);
755 /* packet with broadcast indication but unicast recipient */
756 if (!is_bcast(ethhdr->h_dest))
759 /* packet with broadcast sender address */
760 if (is_bcast(ethhdr->h_source))
763 /* create a copy of the skb, if needed, to modify it. */
764 if (skb_cow(skb, 0) < 0)
767 /* keep skb linear */
768 if (skb_linearize(skb) < 0)
771 ethhdr = (struct ethhdr *)skb_mac_header(skb);
773 spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
774 receive_aggr_bat_packet(ethhdr,
778 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
781 return NET_RX_SUCCESS;
784 static int recv_my_icmp_packet(struct bat_priv *bat_priv,
785 struct sk_buff *skb, size_t icmp_len)
787 struct orig_node *orig_node;
788 struct icmp_packet_rr *icmp_packet;
789 struct ethhdr *ethhdr;
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 if (!bat_priv->primary_if)
807 /* answer echo request (ping) */
808 /* get routing information */
809 spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
810 orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash,
814 if ((orig_node != NULL) &&
815 (orig_node->router != NULL)) {
817 /* don't lock while sending the packets ... we therefore
818 * copy the required data before sending */
819 batman_if = orig_node->router->if_incoming;
820 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
821 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
823 /* create a copy of the skb, if needed, to modify it. */
824 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
827 icmp_packet = (struct icmp_packet_rr *)skb->data;
828 ethhdr = (struct ethhdr *)skb_mac_header(skb);
830 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
831 memcpy(icmp_packet->orig,
832 bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
833 icmp_packet->msg_type = ECHO_REPLY;
834 icmp_packet->ttl = TTL;
836 send_skb_packet(skb, batman_if, dstaddr);
837 ret = NET_RX_SUCCESS;
840 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
845 static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv,
846 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 batman_if *batman_if;
854 uint8_t dstaddr[ETH_ALEN];
856 icmp_packet = (struct icmp_packet *)skb->data;
857 ethhdr = (struct ethhdr *)skb_mac_header(skb);
859 /* send TTL exceeded if packet is an echo request (traceroute) */
860 if (icmp_packet->msg_type != ECHO_REQUEST) {
861 pr_warning("Warning - can't forward icmp packet from %pM to "
862 "%pM: ttl exceeded\n", icmp_packet->orig,
867 if (!bat_priv->primary_if)
870 /* get routing information */
871 spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
872 orig_node = ((struct orig_node *)
873 hash_find(bat_priv->orig_hash, icmp_packet->orig));
876 if ((orig_node != NULL) &&
877 (orig_node->router != NULL)) {
879 /* don't lock while sending the packets ... we therefore
880 * copy the required data before sending */
881 batman_if = orig_node->router->if_incoming;
882 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
883 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
885 /* create a copy of the skb, if needed, to modify it. */
886 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
889 icmp_packet = (struct icmp_packet *) skb->data;
890 ethhdr = (struct ethhdr *)skb_mac_header(skb);
892 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
893 memcpy(icmp_packet->orig,
894 bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
895 icmp_packet->msg_type = TTL_EXCEEDED;
896 icmp_packet->ttl = TTL;
898 send_skb_packet(skb, batman_if, dstaddr);
899 ret = NET_RX_SUCCESS;
902 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
908 int recv_icmp_packet(struct sk_buff *skb, struct batman_if *recv_if)
910 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
911 struct icmp_packet_rr *icmp_packet;
912 struct ethhdr *ethhdr;
913 struct orig_node *orig_node;
914 struct batman_if *batman_if;
915 int hdr_size = sizeof(struct icmp_packet);
918 uint8_t dstaddr[ETH_ALEN];
921 * we truncate all incoming icmp packets if they don't match our size
923 if (skb->len >= sizeof(struct icmp_packet_rr))
924 hdr_size = sizeof(struct icmp_packet_rr);
926 /* drop packet if it has not necessary minimum size */
927 if (unlikely(!pskb_may_pull(skb, hdr_size)))
930 ethhdr = (struct ethhdr *)skb_mac_header(skb);
932 /* packet with unicast indication but broadcast recipient */
933 if (is_bcast(ethhdr->h_dest))
936 /* packet with broadcast sender address */
937 if (is_bcast(ethhdr->h_source))
941 if (!is_my_mac(ethhdr->h_dest))
944 icmp_packet = (struct icmp_packet_rr *)skb->data;
946 /* add record route information if not full */
947 if ((hdr_size == sizeof(struct icmp_packet_rr)) &&
948 (icmp_packet->rr_cur < BAT_RR_LEN)) {
949 memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]),
950 ethhdr->h_dest, ETH_ALEN);
951 icmp_packet->rr_cur++;
955 if (is_my_mac(icmp_packet->dst))
956 return recv_my_icmp_packet(bat_priv, skb, hdr_size);
959 if (icmp_packet->ttl < 2)
960 return recv_icmp_ttl_exceeded(bat_priv, skb, hdr_size);
964 /* get routing information */
965 spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
966 orig_node = ((struct orig_node *)
967 hash_find(bat_priv->orig_hash, icmp_packet->dst));
969 if ((orig_node != NULL) &&
970 (orig_node->router != NULL)) {
972 /* don't lock while sending the packets ... we therefore
973 * copy the required data before sending */
974 batman_if = orig_node->router->if_incoming;
975 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
976 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
978 /* create a copy of the skb, if needed, to modify it. */
979 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
982 icmp_packet = (struct icmp_packet_rr *)skb->data;
983 ethhdr = (struct ethhdr *)skb_mac_header(skb);
989 send_skb_packet(skb, batman_if, dstaddr);
990 ret = NET_RX_SUCCESS;
993 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
998 /* find a suitable router for this originator, and use
999 * bonding if possible. */
1000 struct neigh_node *find_router(struct orig_node *orig_node,
1001 struct batman_if *recv_if)
1003 struct bat_priv *bat_priv;
1004 struct orig_node *primary_orig_node;
1005 struct orig_node *router_orig;
1006 struct neigh_node *router, *first_candidate, *best_router;
1007 static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
1008 int bonding_enabled;
1013 if (!orig_node->router)
1016 /* without bonding, the first node should
1017 * always choose the default router. */
1020 return orig_node->router;
1022 bat_priv = netdev_priv(recv_if->soft_iface);
1023 bonding_enabled = atomic_read(&bat_priv->bonding_enabled);
1025 if (!bonding_enabled)
1026 return orig_node->router;
1028 router_orig = orig_node->router->orig_node;
1030 /* if we have something in the primary_addr, we can search
1031 * for a potential bonding candidate. */
1032 if (memcmp(router_orig->primary_addr, zero_mac, ETH_ALEN) == 0)
1033 return orig_node->router;
1035 /* find the orig_node which has the primary interface. might
1036 * even be the same as our router_orig in many cases */
1038 if (memcmp(router_orig->primary_addr,
1039 router_orig->orig, ETH_ALEN) == 0) {
1040 primary_orig_node = router_orig;
1042 primary_orig_node = hash_find(bat_priv->orig_hash,
1043 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 static int check_unicast_packet(struct sk_buff *skb, int hdr_size)
1098 struct ethhdr *ethhdr;
1100 /* drop packet if it has not necessary minimum size */
1101 if (unlikely(!pskb_may_pull(skb, hdr_size)))
1104 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1106 /* packet with unicast indication but broadcast recipient */
1107 if (is_bcast(ethhdr->h_dest))
1110 /* packet with broadcast sender address */
1111 if (is_bcast(ethhdr->h_source))
1115 if (!is_my_mac(ethhdr->h_dest))
1121 static int route_unicast_packet(struct sk_buff *skb,
1122 struct batman_if *recv_if, int hdr_size)
1124 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1125 struct orig_node *orig_node;
1126 struct neigh_node *router;
1127 struct batman_if *batman_if;
1128 uint8_t dstaddr[ETH_ALEN];
1129 unsigned long flags;
1130 struct unicast_packet *unicast_packet;
1131 struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb);
1133 unicast_packet = (struct unicast_packet *)skb->data;
1136 if (is_my_mac(unicast_packet->dest)) {
1137 interface_rx(recv_if->soft_iface, skb, hdr_size);
1138 return NET_RX_SUCCESS;
1142 if (unicast_packet->ttl < 2) {
1143 pr_warning("Warning - can't forward unicast packet from %pM to "
1144 "%pM: ttl exceeded\n", ethhdr->h_source,
1145 unicast_packet->dest);
1149 /* get routing information */
1150 spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
1151 orig_node = ((struct orig_node *)
1152 hash_find(bat_priv->orig_hash, unicast_packet->dest));
1154 router = find_router(orig_node, recv_if);
1157 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
1161 /* don't lock while sending the packets ... we therefore
1162 * copy the required data before sending */
1164 batman_if = router->if_incoming;
1165 memcpy(dstaddr, router->addr, ETH_ALEN);
1167 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
1169 /* create a copy of the skb, if needed, to modify it. */
1170 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
1173 unicast_packet = (struct unicast_packet *)skb->data;
1174 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1177 unicast_packet->ttl--;
1180 send_skb_packet(skb, batman_if, dstaddr);
1182 return NET_RX_SUCCESS;
1185 int recv_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if)
1187 struct unicast_packet *unicast_packet;
1188 int hdr_size = sizeof(struct unicast_packet);
1190 if (check_unicast_packet(skb, hdr_size) < 0)
1193 unicast_packet = (struct unicast_packet *)skb->data;
1196 if (is_my_mac(unicast_packet->dest)) {
1197 interface_rx(recv_if->soft_iface, skb, hdr_size);
1198 return NET_RX_SUCCESS;
1201 return route_unicast_packet(skb, recv_if, hdr_size);
1204 int recv_ucast_frag_packet(struct sk_buff *skb, struct batman_if *recv_if)
1206 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1207 struct unicast_frag_packet *unicast_packet;
1208 struct orig_node *orig_node;
1209 struct frag_packet_list_entry *tmp_frag_entry;
1210 int hdr_size = sizeof(struct unicast_frag_packet);
1211 unsigned long flags;
1213 if (check_unicast_packet(skb, hdr_size) < 0)
1216 unicast_packet = (struct unicast_frag_packet *)skb->data;
1219 if (is_my_mac(unicast_packet->dest)) {
1221 spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
1222 orig_node = ((struct orig_node *)
1223 hash_find(bat_priv->orig_hash, unicast_packet->orig));
1226 pr_warning("couldn't find orig node for "
1228 spin_unlock_irqrestore(&bat_priv->orig_hash_lock,
1233 orig_node->last_frag_packet = jiffies;
1235 if (list_empty(&orig_node->frag_list))
1236 create_frag_buffer(&orig_node->frag_list);
1239 search_frag_packet(&orig_node->frag_list,
1242 if (!tmp_frag_entry) {
1243 create_frag_entry(&orig_node->frag_list, skb);
1244 spin_unlock_irqrestore(&bat_priv->orig_hash_lock,
1246 return NET_RX_SUCCESS;
1249 skb = merge_frag_packet(&orig_node->frag_list,
1250 tmp_frag_entry, skb);
1251 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
1255 interface_rx(recv_if->soft_iface, skb, hdr_size);
1256 return NET_RX_SUCCESS;
1259 return route_unicast_packet(skb, recv_if, hdr_size);
1263 int recv_bcast_packet(struct sk_buff *skb, struct batman_if *recv_if)
1265 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1266 struct orig_node *orig_node;
1267 struct bcast_packet *bcast_packet;
1268 struct ethhdr *ethhdr;
1269 int hdr_size = sizeof(struct bcast_packet);
1271 unsigned long flags;
1273 /* drop packet if it has not necessary minimum size */
1274 if (unlikely(!pskb_may_pull(skb, hdr_size)))
1277 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1279 /* packet with broadcast indication but unicast recipient */
1280 if (!is_bcast(ethhdr->h_dest))
1283 /* packet with broadcast sender address */
1284 if (is_bcast(ethhdr->h_source))
1287 /* ignore broadcasts sent by myself */
1288 if (is_my_mac(ethhdr->h_source))
1291 bcast_packet = (struct bcast_packet *)skb->data;
1293 /* ignore broadcasts originated by myself */
1294 if (is_my_mac(bcast_packet->orig))
1297 if (bcast_packet->ttl < 2)
1300 spin_lock_irqsave(&bat_priv->orig_hash_lock, flags);
1301 orig_node = ((struct orig_node *)
1302 hash_find(bat_priv->orig_hash, bcast_packet->orig));
1304 if (orig_node == NULL) {
1305 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
1309 /* check whether the packet is a duplicate */
1310 if (get_bit_status(orig_node->bcast_bits,
1311 orig_node->last_bcast_seqno,
1312 ntohl(bcast_packet->seqno))) {
1313 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
1317 seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno;
1319 /* check whether the packet is old and the host just restarted. */
1320 if (window_protected(bat_priv, seq_diff,
1321 &orig_node->bcast_seqno_reset)) {
1322 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
1326 /* mark broadcast in flood history, update window position
1328 if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1))
1329 orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno);
1331 spin_unlock_irqrestore(&bat_priv->orig_hash_lock, flags);
1332 /* rebroadcast packet */
1333 add_bcast_packet_to_list(bat_priv, skb);
1335 /* broadcast for me */
1336 interface_rx(recv_if->soft_iface, skb, hdr_size);
1338 return NET_RX_SUCCESS;
1341 int recv_vis_packet(struct sk_buff *skb, struct batman_if *recv_if)
1343 struct vis_packet *vis_packet;
1344 struct ethhdr *ethhdr;
1345 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1346 int hdr_size = sizeof(struct vis_packet);
1348 /* keep skb linear */
1349 if (skb_linearize(skb) < 0)
1352 if (unlikely(!pskb_may_pull(skb, hdr_size)))
1355 vis_packet = (struct vis_packet *)skb->data;
1356 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1359 if (!is_my_mac(ethhdr->h_dest))
1362 /* ignore own packets */
1363 if (is_my_mac(vis_packet->vis_orig))
1366 if (is_my_mac(vis_packet->sender_orig))
1369 switch (vis_packet->vis_type) {
1370 case VIS_TYPE_SERVER_SYNC:
1371 receive_server_sync_packet(bat_priv, vis_packet,
1375 case VIS_TYPE_CLIENT_UPDATE:
1376 receive_client_update_packet(bat_priv, vis_packet,
1380 default: /* ignore unknown packet */
1384 /* We take a copy of the data in the packet, so we should
1385 always free the skbuf. */