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 static DECLARE_WAIT_QUEUE_HEAD(thread_wait);
39 void slide_own_bcast_window(struct batman_if *batman_if)
42 struct orig_node *orig_node;
46 spin_lock_irqsave(&orig_hash_lock, flags);
48 while (hash_iterate(orig_hash, &hashit)) {
49 orig_node = hashit.bucket->data;
50 word = &(orig_node->bcast_own[batman_if->if_num * NUM_WORDS]);
52 bit_get_packet(word, 1, 0);
53 orig_node->bcast_own_sum[batman_if->if_num] =
54 bit_packet_count(word);
57 spin_unlock_irqrestore(&orig_hash_lock, flags);
60 static void update_HNA(struct orig_node *orig_node,
61 unsigned char *hna_buff, int hna_buff_len)
63 if ((hna_buff_len != orig_node->hna_buff_len) ||
64 ((hna_buff_len > 0) &&
65 (orig_node->hna_buff_len > 0) &&
66 (memcmp(orig_node->hna_buff, hna_buff, hna_buff_len) != 0))) {
68 if (orig_node->hna_buff_len > 0)
69 hna_global_del_orig(orig_node,
70 "originator changed hna");
72 if ((hna_buff_len > 0) && (hna_buff != NULL))
73 hna_global_add_orig(orig_node, hna_buff, hna_buff_len);
77 static void update_route(struct orig_node *orig_node,
78 struct neigh_node *neigh_node,
79 unsigned char *hna_buff, int hna_buff_len)
81 /* FIXME: each orig_node->batman_if will be attached to a softif */
82 struct bat_priv *bat_priv = netdev_priv(soft_device);
85 if ((orig_node->router != NULL) && (neigh_node == NULL)) {
87 bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n",
89 hna_global_del_orig(orig_node, "originator timed out");
92 } else if ((orig_node->router == NULL) && (neigh_node != NULL)) {
94 bat_dbg(DBG_ROUTES, bat_priv,
95 "Adding route towards: %pM (via %pM)\n",
96 orig_node->orig, neigh_node->addr);
97 hna_global_add_orig(orig_node, 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 orig_node *orig_node,
113 struct neigh_node *neigh_node,
114 unsigned char *hna_buff, int hna_buff_len)
117 if (orig_node == NULL)
120 if (orig_node->router != neigh_node)
121 update_route(orig_node, neigh_node, hna_buff, hna_buff_len);
122 /* may be just HNA changed */
124 update_HNA(orig_node, hna_buff, hna_buff_len);
127 static int is_bidirectional_neigh(struct orig_node *orig_node,
128 struct orig_node *orig_neigh_node,
129 struct batman_packet *batman_packet,
130 struct batman_if *if_incoming)
132 /* FIXME: each orig_node->batman_if will be attached to a softif */
133 struct bat_priv *bat_priv = netdev_priv(soft_device);
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 orig_node *orig_node, struct ethhdr *ethhdr,
238 struct batman_packet *batman_packet,
239 struct batman_if *if_incoming,
240 unsigned char *hna_buff, int hna_buff_len,
243 /* FIXME: get bat_priv */
244 struct bat_priv *bat_priv = netdev_priv(soft_device);
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(ethhdr->h_source);
274 neigh_node = create_neighbor(orig_node,
276 ethhdr->h_source, if_incoming);
280 bat_dbg(DBG_BATMAN, bat_priv,
281 "Updating existing last-hop neighbor of originator\n");
283 orig_node->flags = batman_packet->flags;
284 neigh_node->last_valid = jiffies;
286 ring_buffer_set(neigh_node->tq_recv,
287 &neigh_node->tq_index,
289 neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
292 orig_node->last_ttl = batman_packet->ttl;
293 neigh_node->last_ttl = batman_packet->ttl;
296 tmp_hna_buff_len = (hna_buff_len > batman_packet->num_hna * ETH_ALEN ?
297 batman_packet->num_hna * ETH_ALEN : hna_buff_len);
299 /* if this neighbor already is our next hop there is nothing
301 if (orig_node->router == neigh_node)
304 /* if this neighbor does not offer a better TQ we won't consider it */
305 if ((orig_node->router) &&
306 (orig_node->router->tq_avg > neigh_node->tq_avg))
309 /* if the TQ is the same and the link not more symetric we
310 * won't consider it either */
311 if ((orig_node->router) &&
312 ((neigh_node->tq_avg == orig_node->router->tq_avg) &&
313 (orig_node->router->orig_node->bcast_own_sum[if_incoming->if_num]
314 >= neigh_node->orig_node->bcast_own_sum[if_incoming->if_num])))
317 update_routes(orig_node, neigh_node, hna_buff, tmp_hna_buff_len);
321 update_routes(orig_node, orig_node->router, hna_buff, tmp_hna_buff_len);
324 /* checks whether the host restarted and is in the protection time.
326 * 0 if the packet is to be accepted
327 * 1 if the packet is to be ignored.
329 static int window_protected(int32_t seq_num_diff,
330 unsigned long *last_reset)
332 /* FIXME: each orig_node->batman_if will be attached to a softif */
333 struct bat_priv *bat_priv = netdev_priv(soft_device);
335 if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE)
336 || (seq_num_diff >= EXPECTED_SEQNO_RANGE)) {
337 if (time_after(jiffies, *last_reset +
338 msecs_to_jiffies(RESET_PROTECTION_MS))) {
340 *last_reset = jiffies;
341 bat_dbg(DBG_BATMAN, bat_priv,
342 "old packet received, start protection\n");
351 /* processes a batman packet for all interfaces, adjusts the sequence number and
352 * finds out whether it is a duplicate.
354 * 1 the packet is a duplicate
355 * 0 the packet has not yet been received
356 * -1 the packet is old and has been received while the seqno window
357 * was protected. Caller should drop it.
359 static char count_real_packets(struct ethhdr *ethhdr,
360 struct batman_packet *batman_packet,
361 struct batman_if *if_incoming)
363 /* FIXME: each orig_node->batman_if will be attached to a softif */
364 struct bat_priv *bat_priv = netdev_priv(soft_device);
365 struct orig_node *orig_node;
366 struct neigh_node *tmp_neigh_node;
367 char is_duplicate = 0;
372 orig_node = get_orig_node(batman_packet->orig);
373 if (orig_node == NULL)
376 seq_diff = batman_packet->seqno - orig_node->last_real_seqno;
378 /* signalize caller that the packet is to be dropped. */
379 if (window_protected(seq_diff, &orig_node->batman_seqno_reset))
382 list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
384 is_duplicate |= get_bit_status(tmp_neigh_node->real_bits,
385 orig_node->last_real_seqno,
386 batman_packet->seqno);
388 if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) &&
389 (tmp_neigh_node->if_incoming == if_incoming))
394 /* if the window moved, set the update flag. */
395 need_update |= bit_get_packet(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 /* FIXME: each orig_node->batman_if will be attached to a softif */
525 struct bat_priv *bat_priv = netdev_priv(soft_device);
526 struct batman_if *batman_if;
527 struct orig_node *orig_neigh_node, *orig_node;
528 char has_directlink_flag;
529 char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
530 char is_broadcast = 0, is_bidirectional, is_single_hop_neigh;
532 uint32_t if_incoming_seqno;
534 /* Silently drop when the batman packet is actually not a
537 * This might happen if a packet is padded (e.g. Ethernet has a
538 * minimum frame length of 64 byte) and the aggregation interprets
539 * it as an additional length.
541 * TODO: A more sane solution would be to have a bit in the
542 * batman_packet to detect whether the packet is the last
543 * packet in an aggregation. Here we expect that the padding
544 * is always zero (or not 0x01)
546 if (batman_packet->packet_type != BAT_PACKET)
549 /* could be changed by schedule_own_packet() */
550 if_incoming_seqno = atomic_read(&if_incoming->seqno);
552 has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0);
554 is_single_hop_neigh = (compare_orig(ethhdr->h_source,
555 batman_packet->orig) ? 1 : 0);
557 bat_dbg(DBG_BATMAN, bat_priv,
558 "Received BATMAN packet via NB: %pM, IF: %s [%s] "
559 "(from OG: %pM, via prev OG: %pM, seqno %d, tq %d, "
560 "TTL %d, V %d, IDF %d)\n",
561 ethhdr->h_source, if_incoming->dev, if_incoming->addr_str,
562 batman_packet->orig, batman_packet->prev_sender,
563 batman_packet->seqno, batman_packet->tq, batman_packet->ttl,
564 batman_packet->version, has_directlink_flag);
566 list_for_each_entry_rcu(batman_if, &if_list, list) {
567 if (batman_if->if_status != IF_ACTIVE)
570 if (compare_orig(ethhdr->h_source,
571 batman_if->net_dev->dev_addr))
574 if (compare_orig(batman_packet->orig,
575 batman_if->net_dev->dev_addr))
578 if (compare_orig(batman_packet->prev_sender,
579 batman_if->net_dev->dev_addr))
582 if (compare_orig(ethhdr->h_source, broadcast_addr))
586 if (batman_packet->version != COMPAT_VERSION) {
587 bat_dbg(DBG_BATMAN, bat_priv,
588 "Drop packet: incompatible batman version (%i)\n",
589 batman_packet->version);
594 bat_dbg(DBG_BATMAN, bat_priv,
595 "Drop packet: received my own broadcast (sender: %pM"
602 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
603 "ignoring all packets with broadcast source addr (sender: %pM"
604 ")\n", ethhdr->h_source);
612 orig_neigh_node = get_orig_node(ethhdr->h_source);
614 if (!orig_neigh_node)
617 /* neighbor has to indicate direct link and it has to
618 * come via the corresponding interface */
619 /* if received seqno equals last send seqno save new
620 * seqno for bidirectional check */
621 if (has_directlink_flag &&
622 compare_orig(if_incoming->net_dev->dev_addr,
623 batman_packet->orig) &&
624 (batman_packet->seqno - if_incoming_seqno + 2 == 0)) {
625 offset = if_incoming->if_num * NUM_WORDS;
626 word = &(orig_neigh_node->bcast_own[offset]);
628 orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
629 bit_packet_count(word);
632 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
633 "originator packet from myself (via neighbor)\n");
638 bat_dbg(DBG_BATMAN, bat_priv,
639 "Drop packet: ignoring all rebroadcast echos (sender: "
640 "%pM)\n", ethhdr->h_source);
644 orig_node = get_orig_node(batman_packet->orig);
645 if (orig_node == NULL)
648 is_duplicate = count_real_packets(ethhdr, batman_packet, if_incoming);
650 if (is_duplicate == -1) {
651 bat_dbg(DBG_BATMAN, bat_priv,
652 "Drop packet: packet within seqno protection time "
653 "(sender: %pM)\n", ethhdr->h_source);
657 if (batman_packet->tq == 0) {
658 bat_dbg(DBG_BATMAN, bat_priv,
659 "Drop packet: originator packet with tq equal 0\n");
663 /* avoid temporary routing loops */
664 if ((orig_node->router) &&
665 (orig_node->router->orig_node->router) &&
666 (compare_orig(orig_node->router->addr,
667 batman_packet->prev_sender)) &&
668 !(compare_orig(batman_packet->orig, batman_packet->prev_sender)) &&
669 (compare_orig(orig_node->router->addr,
670 orig_node->router->orig_node->router->addr))) {
671 bat_dbg(DBG_BATMAN, bat_priv,
672 "Drop packet: ignoring all rebroadcast packets that "
673 "may make me loop (sender: %pM)\n", ethhdr->h_source);
677 /* if sender is a direct neighbor the sender mac equals
679 orig_neigh_node = (is_single_hop_neigh ?
680 orig_node : get_orig_node(ethhdr->h_source));
681 if (orig_neigh_node == NULL)
684 /* drop packet if sender is not a direct neighbor and if we
685 * don't route towards it */
686 if (!is_single_hop_neigh &&
687 (orig_neigh_node->router == NULL)) {
688 bat_dbg(DBG_BATMAN, bat_priv,
689 "Drop packet: OGM via unknown neighbor!\n");
693 is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node,
694 batman_packet, if_incoming);
696 /* update ranking if it is not a duplicate or has the same
697 * seqno and similar ttl as the non-duplicate */
698 if (is_bidirectional &&
700 ((orig_node->last_real_seqno == batman_packet->seqno) &&
701 (orig_node->last_ttl - 3 <= batman_packet->ttl))))
702 update_orig(orig_node, ethhdr, batman_packet,
703 if_incoming, hna_buff, hna_buff_len, is_duplicate);
705 mark_bonding_address(bat_priv, orig_node,
706 orig_neigh_node, batman_packet);
707 update_bonding_candidates(bat_priv, orig_node);
709 /* is single hop (direct) neighbor */
710 if (is_single_hop_neigh) {
712 /* mark direct link on incoming interface */
713 schedule_forward_packet(orig_node, ethhdr, batman_packet,
714 1, hna_buff_len, if_incoming);
716 bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: "
717 "rebroadcast neighbor packet with direct link flag\n");
721 /* multihop originator */
722 if (!is_bidirectional) {
723 bat_dbg(DBG_BATMAN, bat_priv,
724 "Drop packet: not received via bidirectional link\n");
729 bat_dbg(DBG_BATMAN, bat_priv,
730 "Drop packet: duplicate packet received\n");
734 bat_dbg(DBG_BATMAN, bat_priv,
735 "Forwarding packet: rebroadcast originator packet\n");
736 schedule_forward_packet(orig_node, ethhdr, batman_packet,
737 0, hna_buff_len, if_incoming);
740 int recv_bat_packet(struct sk_buff *skb,
741 struct batman_if *batman_if)
743 struct ethhdr *ethhdr;
745 struct sk_buff *skb_old;
747 /* drop packet if it has not necessary minimum size */
748 if (skb_headlen(skb) < sizeof(struct batman_packet))
751 ethhdr = (struct ethhdr *)skb_mac_header(skb);
753 /* packet with broadcast indication but unicast recipient */
754 if (!is_bcast(ethhdr->h_dest))
757 /* packet with broadcast sender address */
758 if (is_bcast(ethhdr->h_source))
761 /* TODO: we use headlen instead of "length", because
762 * only this data is paged in. */
764 /* create a copy of the skb, if needed, to modify it. */
765 if (!skb_clone_writable(skb, skb_headlen(skb))) {
767 skb = skb_copy(skb, GFP_ATOMIC);
770 ethhdr = (struct ethhdr *)skb_mac_header(skb);
774 spin_lock_irqsave(&orig_hash_lock, flags);
775 receive_aggr_bat_packet(ethhdr,
779 spin_unlock_irqrestore(&orig_hash_lock, flags);
782 return NET_RX_SUCCESS;
785 static int recv_my_icmp_packet(struct sk_buff *skb, size_t icmp_len)
787 /* FIXME: each batman_if will be attached to a softif */
788 struct bat_priv *bat_priv = netdev_priv(soft_device);
789 struct orig_node *orig_node;
790 struct icmp_packet_rr *icmp_packet;
791 struct ethhdr *ethhdr;
792 struct sk_buff *skb_old;
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(&orig_hash_lock, flags);
813 orig_node = ((struct orig_node *)hash_find(orig_hash,
817 if ((orig_node != NULL) &&
818 (orig_node->router != NULL)) {
820 /* don't lock while sending the packets ... we therefore
821 * copy the required data before sending */
822 batman_if = orig_node->router->if_incoming;
823 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
824 spin_unlock_irqrestore(&orig_hash_lock, flags);
826 /* create a copy of the skb, if needed, to modify it. */
828 if (!skb_clone_writable(skb, icmp_len)) {
830 skb = skb_copy(skb, GFP_ATOMIC);
833 icmp_packet = (struct icmp_packet_rr *)skb->data;
834 ethhdr = (struct ethhdr *)skb_mac_header(skb);
838 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
839 memcpy(icmp_packet->orig,
840 bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
841 icmp_packet->msg_type = ECHO_REPLY;
842 icmp_packet->ttl = TTL;
844 send_skb_packet(skb, batman_if, dstaddr);
845 ret = NET_RX_SUCCESS;
848 spin_unlock_irqrestore(&orig_hash_lock, flags);
853 static int recv_icmp_ttl_exceeded(struct sk_buff *skb, size_t icmp_len)
855 /* FIXME: each batman_if will be attached to a softif */
856 struct bat_priv *bat_priv = netdev_priv(soft_device);
857 struct orig_node *orig_node;
858 struct icmp_packet *icmp_packet;
859 struct ethhdr *ethhdr;
860 struct sk_buff *skb_old;
861 struct batman_if *batman_if;
864 uint8_t dstaddr[ETH_ALEN];
866 icmp_packet = (struct icmp_packet *)skb->data;
867 ethhdr = (struct ethhdr *)skb_mac_header(skb);
869 /* send TTL exceeded if packet is an echo request (traceroute) */
870 if (icmp_packet->msg_type != ECHO_REQUEST) {
871 pr_warning("Warning - can't forward icmp packet from %pM to "
872 "%pM: ttl exceeded\n", icmp_packet->orig,
877 if (!bat_priv->primary_if)
880 /* get routing information */
881 spin_lock_irqsave(&orig_hash_lock, flags);
882 orig_node = ((struct orig_node *)
883 hash_find(orig_hash, icmp_packet->orig));
886 if ((orig_node != NULL) &&
887 (orig_node->router != NULL)) {
889 /* don't lock while sending the packets ... we therefore
890 * copy the required data before sending */
891 batman_if = orig_node->router->if_incoming;
892 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
893 spin_unlock_irqrestore(&orig_hash_lock, flags);
895 /* create a copy of the skb, if needed, to modify it. */
896 if (!skb_clone_writable(skb, icmp_len)) {
898 skb = skb_copy(skb, GFP_ATOMIC);
901 icmp_packet = (struct icmp_packet *) skb->data;
902 ethhdr = (struct ethhdr *)skb_mac_header(skb);
906 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
907 memcpy(icmp_packet->orig,
908 bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
909 icmp_packet->msg_type = TTL_EXCEEDED;
910 icmp_packet->ttl = TTL;
912 send_skb_packet(skb, batman_if, dstaddr);
913 ret = NET_RX_SUCCESS;
916 spin_unlock_irqrestore(&orig_hash_lock, flags);
922 int recv_icmp_packet(struct sk_buff *skb)
924 struct icmp_packet_rr *icmp_packet;
925 struct ethhdr *ethhdr;
926 struct orig_node *orig_node;
927 struct sk_buff *skb_old;
928 struct batman_if *batman_if;
929 int hdr_size = sizeof(struct icmp_packet);
932 uint8_t dstaddr[ETH_ALEN];
935 * we truncate all incoming icmp packets if they don't match our size
937 if (skb_headlen(skb) >= sizeof(struct icmp_packet_rr))
938 hdr_size = sizeof(struct icmp_packet_rr);
940 /* drop packet if it has not necessary minimum size */
941 if (skb_headlen(skb) < hdr_size)
944 ethhdr = (struct ethhdr *)skb_mac_header(skb);
946 /* packet with unicast indication but broadcast recipient */
947 if (is_bcast(ethhdr->h_dest))
950 /* packet with broadcast sender address */
951 if (is_bcast(ethhdr->h_source))
955 if (!is_my_mac(ethhdr->h_dest))
958 icmp_packet = (struct icmp_packet_rr *)skb->data;
960 /* add record route information if not full */
961 if ((hdr_size == sizeof(struct icmp_packet_rr)) &&
962 (icmp_packet->rr_cur < BAT_RR_LEN)) {
963 memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]),
964 ethhdr->h_dest, ETH_ALEN);
965 icmp_packet->rr_cur++;
969 if (is_my_mac(icmp_packet->dst))
970 return recv_my_icmp_packet(skb, hdr_size);
973 if (icmp_packet->ttl < 2)
974 return recv_icmp_ttl_exceeded(skb, hdr_size);
978 /* get routing information */
979 spin_lock_irqsave(&orig_hash_lock, flags);
980 orig_node = ((struct orig_node *)
981 hash_find(orig_hash, icmp_packet->dst));
983 if ((orig_node != NULL) &&
984 (orig_node->router != NULL)) {
986 /* don't lock while sending the packets ... we therefore
987 * copy the required data before sending */
988 batman_if = orig_node->router->if_incoming;
989 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
990 spin_unlock_irqrestore(&orig_hash_lock, flags);
992 /* create a copy of the skb, if needed, to modify it. */
993 if (!skb_clone_writable(skb, hdr_size)) {
995 skb = skb_copy(skb, GFP_ATOMIC);
998 icmp_packet = (struct icmp_packet_rr *)skb->data;
999 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1007 send_skb_packet(skb, batman_if, dstaddr);
1008 ret = NET_RX_SUCCESS;
1011 spin_unlock_irqrestore(&orig_hash_lock, flags);
1016 /* find a suitable router for this originator, and use
1017 * bonding if possible. */
1018 struct neigh_node *find_router(struct orig_node *orig_node,
1019 struct batman_if *recv_if)
1021 /* FIXME: each orig_node->batman_if will be attached to a softif */
1022 struct bat_priv *bat_priv = netdev_priv(soft_device);
1023 struct orig_node *primary_orig_node;
1024 struct orig_node *router_orig;
1025 struct neigh_node *router, *first_candidate, *best_router;
1026 static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
1027 int bonding_enabled;
1032 if (!orig_node->router)
1035 /* without bonding, the first node should
1036 * always choose the default router. */
1038 bonding_enabled = atomic_read(&bat_priv->bonding_enabled);
1039 if (!bonding_enabled && (recv_if == NULL))
1040 return orig_node->router;
1042 router_orig = orig_node->router->orig_node;
1044 /* if we have something in the primary_addr, we can search
1045 * for a potential bonding candidate. */
1046 if (memcmp(router_orig->primary_addr, zero_mac, ETH_ALEN) == 0)
1047 return orig_node->router;
1049 /* find the orig_node which has the primary interface. might
1050 * even be the same as our router_orig in many cases */
1052 if (memcmp(router_orig->primary_addr,
1053 router_orig->orig, ETH_ALEN) == 0) {
1054 primary_orig_node = router_orig;
1056 primary_orig_node = hash_find(orig_hash,
1057 router_orig->primary_addr);
1058 if (!primary_orig_node)
1059 return orig_node->router;
1062 /* with less than 2 candidates, we can't do any
1063 * bonding and prefer the original router. */
1065 if (primary_orig_node->bond.candidates < 2)
1066 return orig_node->router;
1069 /* all nodes between should choose a candidate which
1070 * is is not on the interface where the packet came
1072 first_candidate = primary_orig_node->bond.selected;
1073 router = first_candidate;
1075 if (bonding_enabled) {
1076 /* in the bonding case, send the packets in a round
1077 * robin fashion over the remaining interfaces. */
1079 /* recv_if == NULL on the first node. */
1080 if (router->if_incoming != recv_if)
1083 router = router->next_bond_candidate;
1084 } while (router != first_candidate);
1086 primary_orig_node->bond.selected = router->next_bond_candidate;
1089 /* if bonding is disabled, use the best of the
1090 * remaining candidates which are not using
1091 * this interface. */
1092 best_router = first_candidate;
1095 /* recv_if == NULL on the first node. */
1096 if ((router->if_incoming != recv_if) &&
1097 (router->tq_avg > best_router->tq_avg))
1098 best_router = router;
1100 router = router->next_bond_candidate;
1101 } while (router != first_candidate);
1103 router = best_router;
1109 static int check_unicast_packet(struct sk_buff *skb, int hdr_size)
1111 struct ethhdr *ethhdr;
1113 /* drop packet if it has not necessary minimum size */
1114 if (skb_headlen(skb) < hdr_size)
1117 ethhdr = (struct ethhdr *) skb_mac_header(skb);
1119 /* packet with unicast indication but broadcast recipient */
1120 if (is_bcast(ethhdr->h_dest))
1123 /* packet with broadcast sender address */
1124 if (is_bcast(ethhdr->h_source))
1128 if (!is_my_mac(ethhdr->h_dest))
1134 static int route_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if,
1137 struct orig_node *orig_node;
1138 struct neigh_node *router;
1139 struct batman_if *batman_if;
1140 struct sk_buff *skb_old;
1141 uint8_t dstaddr[ETH_ALEN];
1142 unsigned long flags;
1143 struct unicast_packet *unicast_packet =
1144 (struct unicast_packet *) skb->data;
1145 struct ethhdr *ethhdr = (struct ethhdr *) skb_mac_header(skb);
1148 if (unicast_packet->ttl < 2) {
1149 pr_warning("Warning - can't forward unicast packet from %pM to "
1150 "%pM: ttl exceeded\n", ethhdr->h_source,
1151 unicast_packet->dest);
1155 /* get routing information */
1156 spin_lock_irqsave(&orig_hash_lock, flags);
1157 orig_node = ((struct orig_node *)
1158 hash_find(orig_hash, unicast_packet->dest));
1160 router = find_router(orig_node, recv_if);
1163 spin_unlock_irqrestore(&orig_hash_lock, flags);
1167 /* don't lock while sending the packets ... we therefore
1168 * copy the required data before sending */
1170 batman_if = router->if_incoming;
1171 memcpy(dstaddr, router->addr, ETH_ALEN);
1173 spin_unlock_irqrestore(&orig_hash_lock, flags);
1175 /* create a copy of the skb, if needed, to modify it. */
1176 if (!skb_clone_writable(skb, hdr_size)) {
1178 skb = skb_copy(skb, GFP_ATOMIC);
1181 unicast_packet = (struct unicast_packet *) skb->data;
1182 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1187 unicast_packet->ttl--;
1190 send_skb_packet(skb, batman_if, dstaddr);
1192 return NET_RX_SUCCESS;
1195 int recv_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if)
1197 struct unicast_packet *unicast_packet;
1198 int hdr_size = sizeof(struct unicast_packet);
1200 if (check_unicast_packet(skb, hdr_size) < 0)
1203 unicast_packet = (struct unicast_packet *) skb->data;
1206 if (is_my_mac(unicast_packet->dest)) {
1207 interface_rx(skb, hdr_size);
1208 return NET_RX_SUCCESS;
1211 return route_unicast_packet(skb, recv_if, hdr_size);
1214 int recv_ucast_frag_packet(struct sk_buff *skb, struct batman_if *recv_if)
1216 struct unicast_frag_packet *unicast_packet;
1217 struct orig_node *orig_node;
1218 struct frag_packet_list_entry *tmp_frag_entry;
1219 int hdr_size = sizeof(struct unicast_frag_packet);
1220 unsigned long flags;
1222 if (check_unicast_packet(skb, hdr_size) < 0)
1225 unicast_packet = (struct unicast_frag_packet *) skb->data;
1228 if (is_my_mac(unicast_packet->dest)) {
1230 spin_lock_irqsave(&orig_hash_lock, flags);
1231 orig_node = ((struct orig_node *)
1232 hash_find(orig_hash, unicast_packet->orig));
1235 pr_warning("couldn't find orig node for "
1237 spin_unlock_irqrestore(&orig_hash_lock, flags);
1241 orig_node->last_frag_packet = jiffies;
1243 if (list_empty(&orig_node->frag_list))
1244 create_frag_buffer(&orig_node->frag_list);
1247 search_frag_packet(&orig_node->frag_list,
1250 if (!tmp_frag_entry) {
1251 create_frag_entry(&orig_node->frag_list, skb);
1252 spin_unlock_irqrestore(&orig_hash_lock, flags);
1253 return NET_RX_SUCCESS;
1256 skb = merge_frag_packet(&orig_node->frag_list,
1257 tmp_frag_entry, skb);
1258 spin_unlock_irqrestore(&orig_hash_lock, flags);
1262 interface_rx(skb, hdr_size);
1263 return NET_RX_SUCCESS;
1266 return route_unicast_packet(skb, recv_if, hdr_size);
1269 int recv_bcast_packet(struct sk_buff *skb)
1271 struct orig_node *orig_node;
1272 struct bcast_packet *bcast_packet;
1273 struct ethhdr *ethhdr;
1274 int hdr_size = sizeof(struct bcast_packet);
1276 unsigned long flags;
1278 /* drop packet if it has not necessary minimum size */
1279 if (skb_headlen(skb) < hdr_size)
1282 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1284 /* packet with broadcast indication but unicast recipient */
1285 if (!is_bcast(ethhdr->h_dest))
1288 /* packet with broadcast sender address */
1289 if (is_bcast(ethhdr->h_source))
1292 /* ignore broadcasts sent by myself */
1293 if (is_my_mac(ethhdr->h_source))
1296 bcast_packet = (struct bcast_packet *)skb->data;
1298 /* ignore broadcasts originated by myself */
1299 if (is_my_mac(bcast_packet->orig))
1302 if (bcast_packet->ttl < 2)
1305 spin_lock_irqsave(&orig_hash_lock, flags);
1306 orig_node = ((struct orig_node *)
1307 hash_find(orig_hash, bcast_packet->orig));
1309 if (orig_node == NULL) {
1310 spin_unlock_irqrestore(&orig_hash_lock, flags);
1314 /* check whether the packet is a duplicate */
1315 if (get_bit_status(orig_node->bcast_bits,
1316 orig_node->last_bcast_seqno,
1317 ntohl(bcast_packet->seqno))) {
1318 spin_unlock_irqrestore(&orig_hash_lock, flags);
1322 seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno;
1324 /* check whether the packet is old and the host just restarted. */
1325 if (window_protected(seq_diff, &orig_node->bcast_seqno_reset)) {
1326 spin_unlock_irqrestore(&orig_hash_lock, flags);
1330 /* mark broadcast in flood history, update window position
1332 if (bit_get_packet(orig_node->bcast_bits, seq_diff, 1))
1333 orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno);
1335 spin_unlock_irqrestore(&orig_hash_lock, flags);
1336 /* rebroadcast packet */
1337 add_bcast_packet_to_list(skb);
1339 /* broadcast for me */
1340 interface_rx(skb, hdr_size);
1342 return NET_RX_SUCCESS;
1345 int recv_vis_packet(struct sk_buff *skb)
1347 struct vis_packet *vis_packet;
1348 struct ethhdr *ethhdr;
1349 struct bat_priv *bat_priv;
1350 int hdr_size = sizeof(struct vis_packet);
1352 if (skb_headlen(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 /* FIXME: each batman_if will be attached to a softif */
1370 bat_priv = netdev_priv(soft_device);
1372 switch (vis_packet->vis_type) {
1373 case VIS_TYPE_SERVER_SYNC:
1374 /* TODO: handle fragmented skbs properly */
1375 receive_server_sync_packet(bat_priv, vis_packet,
1379 case VIS_TYPE_CLIENT_UPDATE:
1380 /* TODO: handle fragmented skbs properly */
1381 receive_client_update_packet(bat_priv, vis_packet,
1385 default: /* ignore unknown packet */
1389 /* We take a copy of the data in the packet, so we should
1390 always free the skbuf. */