2 * Copyright (C) 2007-2011 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"
31 #include "ring_buffer.h"
33 #include "aggregation.h"
34 #include "gateway_common.h"
35 #include "gateway_client.h"
38 void slide_own_bcast_window(struct hard_iface *hard_iface)
40 struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
41 struct hashtable_t *hash = bat_priv->orig_hash;
42 struct hlist_node *node;
43 struct hlist_head *head;
44 struct orig_node *orig_node;
49 for (i = 0; i < hash->size; i++) {
50 head = &hash->table[i];
53 hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
54 spin_lock_bh(&orig_node->ogm_cnt_lock);
55 word_index = hard_iface->if_num * NUM_WORDS;
56 word = &(orig_node->bcast_own[word_index]);
58 bit_get_packet(bat_priv, word, 1, 0);
59 orig_node->bcast_own_sum[hard_iface->if_num] =
60 bit_packet_count(word);
61 spin_unlock_bh(&orig_node->ogm_cnt_lock);
67 static void update_HNA(struct bat_priv *bat_priv, struct orig_node *orig_node,
68 unsigned char *hna_buff, int hna_buff_len)
70 if ((hna_buff_len != orig_node->hna_buff_len) ||
71 ((hna_buff_len > 0) &&
72 (orig_node->hna_buff_len > 0) &&
73 (memcmp(orig_node->hna_buff, hna_buff, hna_buff_len) != 0))) {
75 if (orig_node->hna_buff_len > 0)
76 hna_global_del_orig(bat_priv, orig_node,
77 "originator changed hna");
79 if ((hna_buff_len > 0) && (hna_buff))
80 hna_global_add_orig(bat_priv, orig_node,
81 hna_buff, hna_buff_len);
85 static void update_route(struct bat_priv *bat_priv,
86 struct orig_node *orig_node,
87 struct neigh_node *neigh_node,
88 unsigned char *hna_buff, int hna_buff_len)
90 struct neigh_node *curr_router;
92 curr_router = orig_node_get_router(orig_node);
95 if ((curr_router) && (!neigh_node)) {
97 bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n",
99 hna_global_del_orig(bat_priv, orig_node,
100 "originator timed out");
103 } else if ((!curr_router) && (neigh_node)) {
105 bat_dbg(DBG_ROUTES, bat_priv,
106 "Adding route towards: %pM (via %pM)\n",
107 orig_node->orig, neigh_node->addr);
108 hna_global_add_orig(bat_priv, orig_node,
109 hna_buff, hna_buff_len);
113 bat_dbg(DBG_ROUTES, bat_priv,
114 "Changing route towards: %pM "
115 "(now via %pM - was via %pM)\n",
116 orig_node->orig, neigh_node->addr,
121 neigh_node_free_ref(curr_router);
123 /* increase refcount of new best neighbor */
124 if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount))
127 spin_lock_bh(&orig_node->neigh_list_lock);
128 rcu_assign_pointer(orig_node->router, neigh_node);
129 spin_unlock_bh(&orig_node->neigh_list_lock);
131 /* decrease refcount of previous best neighbor */
133 neigh_node_free_ref(curr_router);
137 void update_routes(struct bat_priv *bat_priv, struct orig_node *orig_node,
138 struct neigh_node *neigh_node, unsigned char *hna_buff,
141 struct neigh_node *router = NULL;
146 router = orig_node_get_router(orig_node);
148 if (router != neigh_node)
149 update_route(bat_priv, orig_node, neigh_node,
150 hna_buff, hna_buff_len);
151 /* may be just HNA changed */
153 update_HNA(bat_priv, orig_node, hna_buff, hna_buff_len);
157 neigh_node_free_ref(router);
160 static int is_bidirectional_neigh(struct orig_node *orig_node,
161 struct orig_node *orig_neigh_node,
162 struct batman_packet *batman_packet,
163 struct hard_iface *if_incoming)
165 struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
166 struct neigh_node *neigh_node = NULL, *tmp_neigh_node;
167 struct hlist_node *node;
168 unsigned char total_count;
169 uint8_t orig_eq_count, neigh_rq_count, tq_own;
170 int tq_asym_penalty, ret = 0;
172 if (orig_node == orig_neigh_node) {
174 hlist_for_each_entry_rcu(tmp_neigh_node, node,
175 &orig_node->neigh_list, list) {
177 if (!compare_eth(tmp_neigh_node->addr,
178 orig_neigh_node->orig))
181 if (tmp_neigh_node->if_incoming != if_incoming)
184 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
187 neigh_node = tmp_neigh_node;
192 neigh_node = create_neighbor(orig_node,
194 orig_neigh_node->orig,
199 neigh_node->last_valid = jiffies;
201 /* find packet count of corresponding one hop neighbor */
203 hlist_for_each_entry_rcu(tmp_neigh_node, node,
204 &orig_neigh_node->neigh_list, list) {
206 if (!compare_eth(tmp_neigh_node->addr,
207 orig_neigh_node->orig))
210 if (tmp_neigh_node->if_incoming != if_incoming)
213 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
216 neigh_node = tmp_neigh_node;
221 neigh_node = create_neighbor(orig_neigh_node,
223 orig_neigh_node->orig,
229 orig_node->last_valid = jiffies;
231 spin_lock_bh(&orig_node->ogm_cnt_lock);
232 orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];
233 neigh_rq_count = neigh_node->real_packet_count;
234 spin_unlock_bh(&orig_node->ogm_cnt_lock);
236 /* pay attention to not get a value bigger than 100 % */
237 total_count = (orig_eq_count > neigh_rq_count ?
238 neigh_rq_count : orig_eq_count);
240 /* if we have too few packets (too less data) we set tq_own to zero */
241 /* if we receive too few packets it is not considered bidirectional */
242 if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) ||
243 (neigh_rq_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM))
246 /* neigh_node->real_packet_count is never zero as we
247 * only purge old information when getting new
249 tq_own = (TQ_MAX_VALUE * total_count) / neigh_rq_count;
252 * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
253 * affect the nearly-symmetric links only a little, but
254 * punishes asymmetric links more. This will give a value
255 * between 0 and TQ_MAX_VALUE
257 tq_asym_penalty = TQ_MAX_VALUE - (TQ_MAX_VALUE *
258 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *
259 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *
260 (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count)) /
261 (TQ_LOCAL_WINDOW_SIZE *
262 TQ_LOCAL_WINDOW_SIZE *
263 TQ_LOCAL_WINDOW_SIZE);
265 batman_packet->tq = ((batman_packet->tq * tq_own * tq_asym_penalty) /
266 (TQ_MAX_VALUE * TQ_MAX_VALUE));
268 bat_dbg(DBG_BATMAN, bat_priv,
270 "orig = %-15pM neigh = %-15pM => own_bcast = %2i, "
271 "real recv = %2i, local tq: %3i, asym_penalty: %3i, "
273 orig_node->orig, orig_neigh_node->orig, total_count,
274 neigh_rq_count, tq_own, tq_asym_penalty, batman_packet->tq);
276 /* if link has the minimum required transmission quality
277 * consider it bidirectional */
278 if (batman_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT)
283 neigh_node_free_ref(neigh_node);
287 /* caller must hold the neigh_list_lock */
288 void bonding_candidate_del(struct orig_node *orig_node,
289 struct neigh_node *neigh_node)
291 /* this neighbor is not part of our candidate list */
292 if (list_empty(&neigh_node->bonding_list))
295 list_del_rcu(&neigh_node->bonding_list);
296 INIT_LIST_HEAD(&neigh_node->bonding_list);
297 neigh_node_free_ref(neigh_node);
298 atomic_dec(&orig_node->bond_candidates);
304 static void bonding_candidate_add(struct orig_node *orig_node,
305 struct neigh_node *neigh_node)
307 struct hlist_node *node;
308 struct neigh_node *tmp_neigh_node, *router = NULL;
309 uint8_t interference_candidate = 0;
311 spin_lock_bh(&orig_node->neigh_list_lock);
313 /* only consider if it has the same primary address ... */
314 if (!compare_eth(orig_node->orig,
315 neigh_node->orig_node->primary_addr))
318 router = orig_node_get_router(orig_node);
322 /* ... and is good enough to be considered */
323 if (neigh_node->tq_avg < router->tq_avg - BONDING_TQ_THRESHOLD)
327 * check if we have another candidate with the same mac address or
328 * interface. If we do, we won't select this candidate because of
329 * possible interference.
331 hlist_for_each_entry_rcu(tmp_neigh_node, node,
332 &orig_node->neigh_list, list) {
334 if (tmp_neigh_node == neigh_node)
337 /* we only care if the other candidate is even
338 * considered as candidate. */
339 if (list_empty(&tmp_neigh_node->bonding_list))
342 if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) ||
343 (compare_eth(neigh_node->addr, tmp_neigh_node->addr))) {
344 interference_candidate = 1;
349 /* don't care further if it is an interference candidate */
350 if (interference_candidate)
353 /* this neighbor already is part of our candidate list */
354 if (!list_empty(&neigh_node->bonding_list))
357 if (!atomic_inc_not_zero(&neigh_node->refcount))
360 list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list);
361 atomic_inc(&orig_node->bond_candidates);
365 bonding_candidate_del(orig_node, neigh_node);
368 spin_unlock_bh(&orig_node->neigh_list_lock);
371 neigh_node_free_ref(router);
374 /* copy primary address for bonding */
375 static void bonding_save_primary(struct orig_node *orig_node,
376 struct orig_node *orig_neigh_node,
377 struct batman_packet *batman_packet)
379 if (!(batman_packet->flags & PRIMARIES_FIRST_HOP))
382 memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN);
385 static void update_orig(struct bat_priv *bat_priv,
386 struct orig_node *orig_node,
387 struct ethhdr *ethhdr,
388 struct batman_packet *batman_packet,
389 struct hard_iface *if_incoming,
390 unsigned char *hna_buff, int hna_buff_len,
393 struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
394 struct neigh_node *router = NULL;
395 struct orig_node *orig_node_tmp;
396 struct hlist_node *node;
397 int tmp_hna_buff_len;
398 uint8_t bcast_own_sum_orig, bcast_own_sum_neigh;
400 bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): "
401 "Searching and updating originator entry of received packet\n");
404 hlist_for_each_entry_rcu(tmp_neigh_node, node,
405 &orig_node->neigh_list, list) {
406 if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&
407 (tmp_neigh_node->if_incoming == if_incoming) &&
408 atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
410 neigh_node_free_ref(neigh_node);
411 neigh_node = tmp_neigh_node;
418 spin_lock_bh(&tmp_neigh_node->tq_lock);
419 ring_buffer_set(tmp_neigh_node->tq_recv,
420 &tmp_neigh_node->tq_index, 0);
421 tmp_neigh_node->tq_avg =
422 ring_buffer_avg(tmp_neigh_node->tq_recv);
423 spin_unlock_bh(&tmp_neigh_node->tq_lock);
427 struct orig_node *orig_tmp;
429 orig_tmp = get_orig_node(bat_priv, ethhdr->h_source);
433 neigh_node = create_neighbor(orig_node, orig_tmp,
434 ethhdr->h_source, if_incoming);
436 orig_node_free_ref(orig_tmp);
440 bat_dbg(DBG_BATMAN, bat_priv,
441 "Updating existing last-hop neighbor of originator\n");
445 orig_node->flags = batman_packet->flags;
446 neigh_node->last_valid = jiffies;
448 spin_lock_bh(&neigh_node->tq_lock);
449 ring_buffer_set(neigh_node->tq_recv,
450 &neigh_node->tq_index,
452 neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
453 spin_unlock_bh(&neigh_node->tq_lock);
456 orig_node->last_ttl = batman_packet->ttl;
457 neigh_node->last_ttl = batman_packet->ttl;
460 bonding_candidate_add(orig_node, neigh_node);
462 tmp_hna_buff_len = (hna_buff_len > batman_packet->num_hna * ETH_ALEN ?
463 batman_packet->num_hna * ETH_ALEN : hna_buff_len);
465 /* if this neighbor already is our next hop there is nothing
467 router = orig_node_get_router(orig_node);
468 if (router == neigh_node)
471 /* if this neighbor does not offer a better TQ we won't consider it */
472 if (router && (router->tq_avg > neigh_node->tq_avg))
475 /* if the TQ is the same and the link not more symetric we
476 * won't consider it either */
477 if (router && (neigh_node->tq_avg == router->tq_avg)) {
478 orig_node_tmp = router->orig_node;
479 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
481 orig_node_tmp->bcast_own_sum[if_incoming->if_num];
482 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
484 orig_node_tmp = neigh_node->orig_node;
485 spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
486 bcast_own_sum_neigh =
487 orig_node_tmp->bcast_own_sum[if_incoming->if_num];
488 spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
490 if (bcast_own_sum_orig >= bcast_own_sum_neigh)
494 update_routes(bat_priv, orig_node, neigh_node,
495 hna_buff, tmp_hna_buff_len);
499 update_routes(bat_priv, orig_node, router,
500 hna_buff, tmp_hna_buff_len);
503 if (orig_node->gw_flags != batman_packet->gw_flags)
504 gw_node_update(bat_priv, orig_node, batman_packet->gw_flags);
506 orig_node->gw_flags = batman_packet->gw_flags;
508 /* restart gateway selection if fast or late switching was enabled */
509 if ((orig_node->gw_flags) &&
510 (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) &&
511 (atomic_read(&bat_priv->gw_sel_class) > 2))
512 gw_check_election(bat_priv, orig_node);
520 neigh_node_free_ref(neigh_node);
522 neigh_node_free_ref(router);
525 /* checks whether the host restarted and is in the protection time.
527 * 0 if the packet is to be accepted
528 * 1 if the packet is to be ignored.
530 static int window_protected(struct bat_priv *bat_priv,
531 int32_t seq_num_diff,
532 unsigned long *last_reset)
534 if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE)
535 || (seq_num_diff >= EXPECTED_SEQNO_RANGE)) {
536 if (time_after(jiffies, *last_reset +
537 msecs_to_jiffies(RESET_PROTECTION_MS))) {
539 *last_reset = jiffies;
540 bat_dbg(DBG_BATMAN, bat_priv,
541 "old packet received, start protection\n");
550 /* processes a batman packet for all interfaces, adjusts the sequence number and
551 * finds out whether it is a duplicate.
553 * 1 the packet is a duplicate
554 * 0 the packet has not yet been received
555 * -1 the packet is old and has been received while the seqno window
556 * was protected. Caller should drop it.
558 static char count_real_packets(struct ethhdr *ethhdr,
559 struct batman_packet *batman_packet,
560 struct hard_iface *if_incoming)
562 struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
563 struct orig_node *orig_node;
564 struct neigh_node *tmp_neigh_node;
565 struct hlist_node *node;
566 char is_duplicate = 0;
569 int set_mark, ret = -1;
571 orig_node = get_orig_node(bat_priv, batman_packet->orig);
575 spin_lock_bh(&orig_node->ogm_cnt_lock);
576 seq_diff = batman_packet->seqno - orig_node->last_real_seqno;
578 /* signalize caller that the packet is to be dropped. */
579 if (window_protected(bat_priv, seq_diff,
580 &orig_node->batman_seqno_reset))
584 hlist_for_each_entry_rcu(tmp_neigh_node, node,
585 &orig_node->neigh_list, list) {
587 is_duplicate |= get_bit_status(tmp_neigh_node->real_bits,
588 orig_node->last_real_seqno,
589 batman_packet->seqno);
591 if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&
592 (tmp_neigh_node->if_incoming == if_incoming))
597 /* if the window moved, set the update flag. */
598 need_update |= bit_get_packet(bat_priv,
599 tmp_neigh_node->real_bits,
602 tmp_neigh_node->real_packet_count =
603 bit_packet_count(tmp_neigh_node->real_bits);
608 bat_dbg(DBG_BATMAN, bat_priv,
609 "updating last_seqno: old %d, new %d\n",
610 orig_node->last_real_seqno, batman_packet->seqno);
611 orig_node->last_real_seqno = batman_packet->seqno;
617 spin_unlock_bh(&orig_node->ogm_cnt_lock);
618 orig_node_free_ref(orig_node);
622 void receive_bat_packet(struct ethhdr *ethhdr,
623 struct batman_packet *batman_packet,
624 unsigned char *hna_buff, int hna_buff_len,
625 struct hard_iface *if_incoming)
627 struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
628 struct hard_iface *hard_iface;
629 struct orig_node *orig_neigh_node, *orig_node;
630 struct neigh_node *router = NULL, *router_router = NULL;
631 struct neigh_node *orig_neigh_router = NULL;
632 char has_directlink_flag;
633 char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
634 char is_broadcast = 0, is_bidirectional, is_single_hop_neigh;
636 uint32_t if_incoming_seqno;
638 /* Silently drop when the batman packet is actually not a
641 * This might happen if a packet is padded (e.g. Ethernet has a
642 * minimum frame length of 64 byte) and the aggregation interprets
643 * it as an additional length.
645 * TODO: A more sane solution would be to have a bit in the
646 * batman_packet to detect whether the packet is the last
647 * packet in an aggregation. Here we expect that the padding
648 * is always zero (or not 0x01)
650 if (batman_packet->packet_type != BAT_PACKET)
653 /* could be changed by schedule_own_packet() */
654 if_incoming_seqno = atomic_read(&if_incoming->seqno);
656 has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0);
658 is_single_hop_neigh = (compare_eth(ethhdr->h_source,
659 batman_packet->orig) ? 1 : 0);
661 bat_dbg(DBG_BATMAN, bat_priv,
662 "Received BATMAN packet via NB: %pM, IF: %s [%pM] "
663 "(from OG: %pM, via prev OG: %pM, seqno %d, tq %d, "
664 "TTL %d, V %d, IDF %d)\n",
665 ethhdr->h_source, if_incoming->net_dev->name,
666 if_incoming->net_dev->dev_addr, batman_packet->orig,
667 batman_packet->prev_sender, batman_packet->seqno,
668 batman_packet->tq, batman_packet->ttl, batman_packet->version,
669 has_directlink_flag);
672 list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
673 if (hard_iface->if_status != IF_ACTIVE)
676 if (hard_iface->soft_iface != if_incoming->soft_iface)
679 if (compare_eth(ethhdr->h_source,
680 hard_iface->net_dev->dev_addr))
683 if (compare_eth(batman_packet->orig,
684 hard_iface->net_dev->dev_addr))
687 if (compare_eth(batman_packet->prev_sender,
688 hard_iface->net_dev->dev_addr))
691 if (compare_eth(ethhdr->h_source, broadcast_addr))
696 if (batman_packet->version != COMPAT_VERSION) {
697 bat_dbg(DBG_BATMAN, bat_priv,
698 "Drop packet: incompatible batman version (%i)\n",
699 batman_packet->version);
704 bat_dbg(DBG_BATMAN, bat_priv,
705 "Drop packet: received my own broadcast (sender: %pM"
712 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
713 "ignoring all packets with broadcast source addr (sender: %pM"
714 ")\n", ethhdr->h_source);
722 orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source);
723 if (!orig_neigh_node)
726 /* neighbor has to indicate direct link and it has to
727 * come via the corresponding interface */
728 /* if received seqno equals last send seqno save new
729 * seqno for bidirectional check */
730 if (has_directlink_flag &&
731 compare_eth(if_incoming->net_dev->dev_addr,
732 batman_packet->orig) &&
733 (batman_packet->seqno - if_incoming_seqno + 2 == 0)) {
734 offset = if_incoming->if_num * NUM_WORDS;
736 spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
737 word = &(orig_neigh_node->bcast_own[offset]);
739 orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
740 bit_packet_count(word);
741 spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
744 bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
745 "originator packet from myself (via neighbor)\n");
746 orig_node_free_ref(orig_neigh_node);
751 bat_dbg(DBG_BATMAN, bat_priv,
752 "Drop packet: ignoring all rebroadcast echos (sender: "
753 "%pM)\n", ethhdr->h_source);
757 orig_node = get_orig_node(bat_priv, batman_packet->orig);
761 is_duplicate = count_real_packets(ethhdr, batman_packet, if_incoming);
763 if (is_duplicate == -1) {
764 bat_dbg(DBG_BATMAN, bat_priv,
765 "Drop packet: packet within seqno protection time "
766 "(sender: %pM)\n", ethhdr->h_source);
770 if (batman_packet->tq == 0) {
771 bat_dbg(DBG_BATMAN, bat_priv,
772 "Drop packet: originator packet with tq equal 0\n");
776 router = orig_node_get_router(orig_node);
778 router_router = orig_node_get_router(router->orig_node);
780 /* avoid temporary routing loops */
781 if (router && router_router &&
782 (compare_eth(router->addr, batman_packet->prev_sender)) &&
783 !(compare_eth(batman_packet->orig, batman_packet->prev_sender)) &&
784 (compare_eth(router->addr, router_router->addr))) {
785 bat_dbg(DBG_BATMAN, bat_priv,
786 "Drop packet: ignoring all rebroadcast packets that "
787 "may make me loop (sender: %pM)\n", ethhdr->h_source);
791 /* if sender is a direct neighbor the sender mac equals
793 orig_neigh_node = (is_single_hop_neigh ?
795 get_orig_node(bat_priv, ethhdr->h_source));
796 if (!orig_neigh_node)
799 orig_neigh_router = orig_node_get_router(orig_neigh_node);
801 /* drop packet if sender is not a direct neighbor and if we
802 * don't route towards it */
803 if (!is_single_hop_neigh && (!orig_neigh_router)) {
804 bat_dbg(DBG_BATMAN, bat_priv,
805 "Drop packet: OGM via unknown neighbor!\n");
809 is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node,
810 batman_packet, if_incoming);
812 bonding_save_primary(orig_node, orig_neigh_node, batman_packet);
814 /* update ranking if it is not a duplicate or has the same
815 * seqno and similar ttl as the non-duplicate */
816 if (is_bidirectional &&
818 ((orig_node->last_real_seqno == batman_packet->seqno) &&
819 (orig_node->last_ttl - 3 <= batman_packet->ttl))))
820 update_orig(bat_priv, orig_node, ethhdr, batman_packet,
821 if_incoming, hna_buff, hna_buff_len, is_duplicate);
823 /* is single hop (direct) neighbor */
824 if (is_single_hop_neigh) {
826 /* mark direct link on incoming interface */
827 schedule_forward_packet(orig_node, ethhdr, batman_packet,
828 1, hna_buff_len, if_incoming);
830 bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: "
831 "rebroadcast neighbor packet with direct link flag\n");
835 /* multihop originator */
836 if (!is_bidirectional) {
837 bat_dbg(DBG_BATMAN, bat_priv,
838 "Drop packet: not received via bidirectional link\n");
843 bat_dbg(DBG_BATMAN, bat_priv,
844 "Drop packet: duplicate packet received\n");
848 bat_dbg(DBG_BATMAN, bat_priv,
849 "Forwarding packet: rebroadcast originator packet\n");
850 schedule_forward_packet(orig_node, ethhdr, batman_packet,
851 0, hna_buff_len, if_incoming);
854 if ((orig_neigh_node) && (!is_single_hop_neigh))
855 orig_node_free_ref(orig_neigh_node);
858 neigh_node_free_ref(router);
860 neigh_node_free_ref(router_router);
861 if (orig_neigh_router)
862 neigh_node_free_ref(orig_neigh_router);
864 orig_node_free_ref(orig_node);
867 int recv_bat_packet(struct sk_buff *skb, struct hard_iface *hard_iface)
869 struct ethhdr *ethhdr;
871 /* drop packet if it has not necessary minimum size */
872 if (unlikely(!pskb_may_pull(skb, sizeof(struct batman_packet))))
875 ethhdr = (struct ethhdr *)skb_mac_header(skb);
877 /* packet with broadcast indication but unicast recipient */
878 if (!is_broadcast_ether_addr(ethhdr->h_dest))
881 /* packet with broadcast sender address */
882 if (is_broadcast_ether_addr(ethhdr->h_source))
885 /* create a copy of the skb, if needed, to modify it. */
886 if (skb_cow(skb, 0) < 0)
889 /* keep skb linear */
890 if (skb_linearize(skb) < 0)
893 ethhdr = (struct ethhdr *)skb_mac_header(skb);
895 receive_aggr_bat_packet(ethhdr,
901 return NET_RX_SUCCESS;
904 static int recv_my_icmp_packet(struct bat_priv *bat_priv,
905 struct sk_buff *skb, size_t icmp_len)
907 struct orig_node *orig_node = NULL;
908 struct neigh_node *router = NULL;
909 struct icmp_packet_rr *icmp_packet;
910 int ret = NET_RX_DROP;
912 icmp_packet = (struct icmp_packet_rr *)skb->data;
914 /* add data to device queue */
915 if (icmp_packet->msg_type != ECHO_REQUEST) {
916 bat_socket_receive_packet(icmp_packet, icmp_len);
920 if (!bat_priv->primary_if)
923 /* answer echo request (ping) */
924 /* get routing information */
925 orig_node = orig_hash_find(bat_priv, icmp_packet->orig);
929 router = orig_node_get_router(orig_node);
933 /* create a copy of the skb, if needed, to modify it. */
934 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
937 icmp_packet = (struct icmp_packet_rr *)skb->data;
939 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
940 memcpy(icmp_packet->orig,
941 bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
942 icmp_packet->msg_type = ECHO_REPLY;
943 icmp_packet->ttl = TTL;
945 send_skb_packet(skb, router->if_incoming, router->addr);
946 ret = NET_RX_SUCCESS;
950 neigh_node_free_ref(router);
952 orig_node_free_ref(orig_node);
956 static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv,
959 struct orig_node *orig_node = NULL;
960 struct neigh_node *router = NULL;
961 struct icmp_packet *icmp_packet;
962 int ret = NET_RX_DROP;
964 icmp_packet = (struct icmp_packet *)skb->data;
966 /* send TTL exceeded if packet is an echo request (traceroute) */
967 if (icmp_packet->msg_type != ECHO_REQUEST) {
968 pr_debug("Warning - can't forward icmp packet from %pM to "
969 "%pM: ttl exceeded\n", icmp_packet->orig,
974 if (!bat_priv->primary_if)
977 /* get routing information */
978 orig_node = orig_hash_find(bat_priv, icmp_packet->orig);
982 router = orig_node_get_router(orig_node);
986 /* create a copy of the skb, if needed, to modify it. */
987 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
990 icmp_packet = (struct icmp_packet *)skb->data;
992 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
993 memcpy(icmp_packet->orig,
994 bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
995 icmp_packet->msg_type = TTL_EXCEEDED;
996 icmp_packet->ttl = TTL;
998 send_skb_packet(skb, router->if_incoming, router->addr);
999 ret = NET_RX_SUCCESS;
1003 neigh_node_free_ref(router);
1005 orig_node_free_ref(orig_node);
1010 int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if)
1012 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1013 struct icmp_packet_rr *icmp_packet;
1014 struct ethhdr *ethhdr;
1015 struct orig_node *orig_node = NULL;
1016 struct neigh_node *router = NULL;
1017 int hdr_size = sizeof(struct icmp_packet);
1018 int ret = NET_RX_DROP;
1021 * we truncate all incoming icmp packets if they don't match our size
1023 if (skb->len >= sizeof(struct icmp_packet_rr))
1024 hdr_size = sizeof(struct icmp_packet_rr);
1026 /* drop packet if it has not necessary minimum size */
1027 if (unlikely(!pskb_may_pull(skb, hdr_size)))
1030 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1032 /* packet with unicast indication but broadcast recipient */
1033 if (is_broadcast_ether_addr(ethhdr->h_dest))
1036 /* packet with broadcast sender address */
1037 if (is_broadcast_ether_addr(ethhdr->h_source))
1041 if (!is_my_mac(ethhdr->h_dest))
1044 icmp_packet = (struct icmp_packet_rr *)skb->data;
1046 /* add record route information if not full */
1047 if ((hdr_size == sizeof(struct icmp_packet_rr)) &&
1048 (icmp_packet->rr_cur < BAT_RR_LEN)) {
1049 memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]),
1050 ethhdr->h_dest, ETH_ALEN);
1051 icmp_packet->rr_cur++;
1055 if (is_my_mac(icmp_packet->dst))
1056 return recv_my_icmp_packet(bat_priv, skb, hdr_size);
1059 if (icmp_packet->ttl < 2)
1060 return recv_icmp_ttl_exceeded(bat_priv, skb);
1062 /* get routing information */
1063 orig_node = orig_hash_find(bat_priv, icmp_packet->dst);
1067 router = orig_node_get_router(orig_node);
1071 /* create a copy of the skb, if needed, to modify it. */
1072 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
1075 icmp_packet = (struct icmp_packet_rr *)skb->data;
1081 send_skb_packet(skb, router->if_incoming, router->addr);
1082 ret = NET_RX_SUCCESS;
1086 neigh_node_free_ref(router);
1088 orig_node_free_ref(orig_node);
1092 /* In the bonding case, send the packets in a round
1093 * robin fashion over the remaining interfaces.
1095 * This method rotates the bonding list and increases the
1096 * returned router's refcount. */
1097 static struct neigh_node *find_bond_router(struct orig_node *primary_orig,
1098 struct hard_iface *recv_if)
1100 struct neigh_node *tmp_neigh_node;
1101 struct neigh_node *router = NULL, *first_candidate = NULL;
1104 list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list,
1106 if (!first_candidate)
1107 first_candidate = tmp_neigh_node;
1109 /* recv_if == NULL on the first node. */
1110 if (tmp_neigh_node->if_incoming == recv_if)
1113 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
1116 router = tmp_neigh_node;
1120 /* use the first candidate if nothing was found. */
1121 if (!router && first_candidate &&
1122 atomic_inc_not_zero(&first_candidate->refcount))
1123 router = first_candidate;
1128 /* selected should point to the next element
1129 * after the current router */
1130 spin_lock_bh(&primary_orig->neigh_list_lock);
1131 /* this is a list_move(), which unfortunately
1132 * does not exist as rcu version */
1133 list_del_rcu(&primary_orig->bond_list);
1134 list_add_rcu(&primary_orig->bond_list,
1135 &router->bonding_list);
1136 spin_unlock_bh(&primary_orig->neigh_list_lock);
1143 /* Interface Alternating: Use the best of the
1144 * remaining candidates which are not using
1147 * Increases the returned router's refcount */
1148 static struct neigh_node *find_ifalter_router(struct orig_node *primary_orig,
1149 struct hard_iface *recv_if)
1151 struct neigh_node *tmp_neigh_node;
1152 struct neigh_node *router = NULL, *first_candidate = NULL;
1155 list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list,
1157 if (!first_candidate)
1158 first_candidate = tmp_neigh_node;
1160 /* recv_if == NULL on the first node. */
1161 if (tmp_neigh_node->if_incoming == recv_if)
1164 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
1167 /* if we don't have a router yet
1168 * or this one is better, choose it. */
1170 (tmp_neigh_node->tq_avg > router->tq_avg)) {
1171 /* decrement refcount of
1172 * previously selected router */
1174 neigh_node_free_ref(router);
1176 router = tmp_neigh_node;
1177 atomic_inc_not_zero(&router->refcount);
1180 neigh_node_free_ref(tmp_neigh_node);
1183 /* use the first candidate if nothing was found. */
1184 if (!router && first_candidate &&
1185 atomic_inc_not_zero(&first_candidate->refcount))
1186 router = first_candidate;
1192 /* find a suitable router for this originator, and use
1193 * bonding if possible. increases the found neighbors
1195 struct neigh_node *find_router(struct bat_priv *bat_priv,
1196 struct orig_node *orig_node,
1197 struct hard_iface *recv_if)
1199 struct orig_node *primary_orig_node;
1200 struct orig_node *router_orig;
1201 struct neigh_node *router;
1202 static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
1203 int bonding_enabled;
1208 router = orig_node_get_router(orig_node);
1212 /* without bonding, the first node should
1213 * always choose the default router. */
1214 bonding_enabled = atomic_read(&bat_priv->bonding);
1217 /* select default router to output */
1218 router_orig = router->orig_node;
1224 if ((!recv_if) && (!bonding_enabled))
1227 /* if we have something in the primary_addr, we can search
1228 * for a potential bonding candidate. */
1229 if (compare_eth(router_orig->primary_addr, zero_mac))
1232 /* find the orig_node which has the primary interface. might
1233 * even be the same as our router_orig in many cases */
1235 if (compare_eth(router_orig->primary_addr, router_orig->orig)) {
1236 primary_orig_node = router_orig;
1238 primary_orig_node = orig_hash_find(bat_priv,
1239 router_orig->primary_addr);
1240 if (!primary_orig_node)
1243 orig_node_free_ref(primary_orig_node);
1246 /* with less than 2 candidates, we can't do any
1247 * bonding and prefer the original router. */
1248 if (atomic_read(&primary_orig_node->bond_candidates) < 2)
1251 /* all nodes between should choose a candidate which
1252 * is is not on the interface where the packet came
1255 neigh_node_free_ref(router);
1257 if (bonding_enabled)
1258 router = find_bond_router(primary_orig_node, recv_if);
1260 router = find_ifalter_router(primary_orig_node, recv_if);
1267 static int check_unicast_packet(struct sk_buff *skb, int hdr_size)
1269 struct ethhdr *ethhdr;
1271 /* drop packet if it has not necessary minimum size */
1272 if (unlikely(!pskb_may_pull(skb, hdr_size)))
1275 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1277 /* packet with unicast indication but broadcast recipient */
1278 if (is_broadcast_ether_addr(ethhdr->h_dest))
1281 /* packet with broadcast sender address */
1282 if (is_broadcast_ether_addr(ethhdr->h_source))
1286 if (!is_my_mac(ethhdr->h_dest))
1292 int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
1294 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1295 struct orig_node *orig_node = NULL;
1296 struct neigh_node *neigh_node = NULL;
1297 struct unicast_packet *unicast_packet;
1298 struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb);
1299 int ret = NET_RX_DROP;
1300 struct sk_buff *new_skb;
1302 unicast_packet = (struct unicast_packet *)skb->data;
1305 if (unicast_packet->ttl < 2) {
1306 pr_debug("Warning - can't forward unicast packet from %pM to "
1307 "%pM: ttl exceeded\n", ethhdr->h_source,
1308 unicast_packet->dest);
1312 /* get routing information */
1313 orig_node = orig_hash_find(bat_priv, unicast_packet->dest);
1318 /* find_router() increases neigh_nodes refcount if found. */
1319 neigh_node = find_router(bat_priv, orig_node, recv_if);
1324 /* create a copy of the skb, if needed, to modify it. */
1325 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
1328 unicast_packet = (struct unicast_packet *)skb->data;
1330 if (unicast_packet->packet_type == BAT_UNICAST &&
1331 atomic_read(&bat_priv->fragmentation) &&
1332 skb->len > neigh_node->if_incoming->net_dev->mtu) {
1333 ret = frag_send_skb(skb, bat_priv,
1334 neigh_node->if_incoming, neigh_node->addr);
1338 if (unicast_packet->packet_type == BAT_UNICAST_FRAG &&
1339 frag_can_reassemble(skb, neigh_node->if_incoming->net_dev->mtu)) {
1341 ret = frag_reassemble_skb(skb, bat_priv, &new_skb);
1343 if (ret == NET_RX_DROP)
1346 /* packet was buffered for late merge */
1348 ret = NET_RX_SUCCESS;
1353 unicast_packet = (struct unicast_packet *)skb->data;
1357 unicast_packet->ttl--;
1360 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1361 ret = NET_RX_SUCCESS;
1365 neigh_node_free_ref(neigh_node);
1367 orig_node_free_ref(orig_node);
1371 int recv_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
1373 struct unicast_packet *unicast_packet;
1374 int hdr_size = sizeof(struct unicast_packet);
1376 if (check_unicast_packet(skb, hdr_size) < 0)
1379 unicast_packet = (struct unicast_packet *)skb->data;
1382 if (is_my_mac(unicast_packet->dest)) {
1383 interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size);
1384 return NET_RX_SUCCESS;
1387 return route_unicast_packet(skb, recv_if);
1390 int recv_ucast_frag_packet(struct sk_buff *skb, struct hard_iface *recv_if)
1392 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1393 struct unicast_frag_packet *unicast_packet;
1394 int hdr_size = sizeof(struct unicast_frag_packet);
1395 struct sk_buff *new_skb = NULL;
1398 if (check_unicast_packet(skb, hdr_size) < 0)
1401 unicast_packet = (struct unicast_frag_packet *)skb->data;
1404 if (is_my_mac(unicast_packet->dest)) {
1406 ret = frag_reassemble_skb(skb, bat_priv, &new_skb);
1408 if (ret == NET_RX_DROP)
1411 /* packet was buffered for late merge */
1413 return NET_RX_SUCCESS;
1415 interface_rx(recv_if->soft_iface, new_skb, recv_if,
1416 sizeof(struct unicast_packet));
1417 return NET_RX_SUCCESS;
1420 return route_unicast_packet(skb, recv_if);
1424 int recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
1426 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1427 struct orig_node *orig_node = NULL;
1428 struct bcast_packet *bcast_packet;
1429 struct ethhdr *ethhdr;
1430 int hdr_size = sizeof(struct bcast_packet);
1431 int ret = NET_RX_DROP;
1434 /* drop packet if it has not necessary minimum size */
1435 if (unlikely(!pskb_may_pull(skb, hdr_size)))
1438 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1440 /* packet with broadcast indication but unicast recipient */
1441 if (!is_broadcast_ether_addr(ethhdr->h_dest))
1444 /* packet with broadcast sender address */
1445 if (is_broadcast_ether_addr(ethhdr->h_source))
1448 /* ignore broadcasts sent by myself */
1449 if (is_my_mac(ethhdr->h_source))
1452 bcast_packet = (struct bcast_packet *)skb->data;
1454 /* ignore broadcasts originated by myself */
1455 if (is_my_mac(bcast_packet->orig))
1458 if (bcast_packet->ttl < 2)
1461 orig_node = orig_hash_find(bat_priv, bcast_packet->orig);
1466 spin_lock_bh(&orig_node->bcast_seqno_lock);
1468 /* check whether the packet is a duplicate */
1469 if (get_bit_status(orig_node->bcast_bits, orig_node->last_bcast_seqno,
1470 ntohl(bcast_packet->seqno)))
1473 seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno;
1475 /* check whether the packet is old and the host just restarted. */
1476 if (window_protected(bat_priv, seq_diff,
1477 &orig_node->bcast_seqno_reset))
1480 /* mark broadcast in flood history, update window position
1482 if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1))
1483 orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno);
1485 spin_unlock_bh(&orig_node->bcast_seqno_lock);
1487 /* rebroadcast packet */
1488 add_bcast_packet_to_list(bat_priv, skb);
1490 /* broadcast for me */
1491 interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size);
1492 ret = NET_RX_SUCCESS;
1496 spin_unlock_bh(&orig_node->bcast_seqno_lock);
1499 orig_node_free_ref(orig_node);
1503 int recv_vis_packet(struct sk_buff *skb, struct hard_iface *recv_if)
1505 struct vis_packet *vis_packet;
1506 struct ethhdr *ethhdr;
1507 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1508 int hdr_size = sizeof(struct vis_packet);
1510 /* keep skb linear */
1511 if (skb_linearize(skb) < 0)
1514 if (unlikely(!pskb_may_pull(skb, hdr_size)))
1517 vis_packet = (struct vis_packet *)skb->data;
1518 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1521 if (!is_my_mac(ethhdr->h_dest))
1524 /* ignore own packets */
1525 if (is_my_mac(vis_packet->vis_orig))
1528 if (is_my_mac(vis_packet->sender_orig))
1531 switch (vis_packet->vis_type) {
1532 case VIS_TYPE_SERVER_SYNC:
1533 receive_server_sync_packet(bat_priv, vis_packet,
1537 case VIS_TYPE_CLIENT_UPDATE:
1538 receive_client_update_packet(bat_priv, vis_packet,
1542 default: /* ignore unknown packet */
1546 /* We take a copy of the data in the packet, so we should
1547 always free the skbuf. */