1 /* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors:
3 * Marek Lindner, Simon Wunderlich
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of version 2 of the GNU General Public
7 * License as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
23 #include "soft-interface.h"
24 #include "hard-interface.h"
25 #include "icmp_socket.h"
26 #include "translation-table.h"
27 #include "originator.h"
30 #include "bridge_loop_avoidance.h"
31 #include "distributed-arp-table.h"
33 static int batadv_route_unicast_packet(struct sk_buff *skb,
34 struct batadv_hard_iface *recv_if);
36 void batadv_slide_own_bcast_window(struct batadv_hard_iface *hard_iface)
38 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
39 struct batadv_hashtable *hash = bat_priv->orig_hash;
40 struct hlist_head *head;
41 struct batadv_orig_node *orig_node;
47 for (i = 0; i < hash->size; i++) {
48 head = &hash->table[i];
51 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
52 spin_lock_bh(&orig_node->ogm_cnt_lock);
53 word_index = hard_iface->if_num * BATADV_NUM_WORDS;
54 word = &(orig_node->bcast_own[word_index]);
56 batadv_bit_get_packet(bat_priv, word, 1, 0);
57 w = &orig_node->bcast_own_sum[hard_iface->if_num];
58 *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE);
59 spin_unlock_bh(&orig_node->ogm_cnt_lock);
65 static void _batadv_update_route(struct batadv_priv *bat_priv,
66 struct batadv_orig_node *orig_node,
67 struct batadv_neigh_node *neigh_node)
69 struct batadv_neigh_node *curr_router;
71 curr_router = batadv_orig_node_get_router(orig_node);
74 if ((curr_router) && (!neigh_node)) {
75 batadv_dbg(BATADV_DBG_ROUTES, bat_priv,
76 "Deleting route towards: %pM\n", orig_node->orig);
77 batadv_tt_global_del_orig(bat_priv, orig_node,
78 "Deleted route towards originator");
81 } else if ((!curr_router) && (neigh_node)) {
82 batadv_dbg(BATADV_DBG_ROUTES, bat_priv,
83 "Adding route towards: %pM (via %pM)\n",
84 orig_node->orig, neigh_node->addr);
86 } else if (neigh_node && curr_router) {
87 batadv_dbg(BATADV_DBG_ROUTES, bat_priv,
88 "Changing route towards: %pM (now via %pM - was via %pM)\n",
89 orig_node->orig, neigh_node->addr,
94 batadv_neigh_node_free_ref(curr_router);
96 /* increase refcount of new best neighbor */
97 if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount))
100 spin_lock_bh(&orig_node->neigh_list_lock);
101 rcu_assign_pointer(orig_node->router, neigh_node);
102 spin_unlock_bh(&orig_node->neigh_list_lock);
104 /* decrease refcount of previous best neighbor */
106 batadv_neigh_node_free_ref(curr_router);
109 void batadv_update_route(struct batadv_priv *bat_priv,
110 struct batadv_orig_node *orig_node,
111 struct batadv_neigh_node *neigh_node)
113 struct batadv_neigh_node *router = NULL;
118 router = batadv_orig_node_get_router(orig_node);
120 if (router != neigh_node)
121 _batadv_update_route(bat_priv, orig_node, neigh_node);
125 batadv_neigh_node_free_ref(router);
128 /* caller must hold the neigh_list_lock */
129 void batadv_bonding_candidate_del(struct batadv_orig_node *orig_node,
130 struct batadv_neigh_node *neigh_node)
132 /* this neighbor is not part of our candidate list */
133 if (list_empty(&neigh_node->bonding_list))
136 list_del_rcu(&neigh_node->bonding_list);
137 INIT_LIST_HEAD(&neigh_node->bonding_list);
138 batadv_neigh_node_free_ref(neigh_node);
139 atomic_dec(&orig_node->bond_candidates);
145 void batadv_bonding_candidate_add(struct batadv_orig_node *orig_node,
146 struct batadv_neigh_node *neigh_node)
148 struct batadv_neigh_node *tmp_neigh_node, *router = NULL;
149 uint8_t interference_candidate = 0;
151 spin_lock_bh(&orig_node->neigh_list_lock);
153 /* only consider if it has the same primary address ... */
154 if (!batadv_compare_eth(orig_node->orig,
155 neigh_node->orig_node->primary_addr))
158 router = batadv_orig_node_get_router(orig_node);
162 /* ... and is good enough to be considered */
163 if (neigh_node->tq_avg < router->tq_avg - BATADV_BONDING_TQ_THRESHOLD)
166 /* check if we have another candidate with the same mac address or
167 * interface. If we do, we won't select this candidate because of
168 * possible interference.
170 hlist_for_each_entry_rcu(tmp_neigh_node,
171 &orig_node->neigh_list, list) {
172 if (tmp_neigh_node == neigh_node)
175 /* we only care if the other candidate is even
176 * considered as candidate.
178 if (list_empty(&tmp_neigh_node->bonding_list))
181 if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) ||
182 (batadv_compare_eth(neigh_node->addr,
183 tmp_neigh_node->addr))) {
184 interference_candidate = 1;
189 /* don't care further if it is an interference candidate */
190 if (interference_candidate)
193 /* this neighbor already is part of our candidate list */
194 if (!list_empty(&neigh_node->bonding_list))
197 if (!atomic_inc_not_zero(&neigh_node->refcount))
200 list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list);
201 atomic_inc(&orig_node->bond_candidates);
205 batadv_bonding_candidate_del(orig_node, neigh_node);
208 spin_unlock_bh(&orig_node->neigh_list_lock);
211 batadv_neigh_node_free_ref(router);
214 /* copy primary address for bonding */
216 batadv_bonding_save_primary(const struct batadv_orig_node *orig_node,
217 struct batadv_orig_node *orig_neigh_node,
218 const struct batadv_ogm_packet *batman_ogm_packet)
220 if (!(batman_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP))
223 memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN);
226 /* checks whether the host restarted and is in the protection time.
228 * 0 if the packet is to be accepted
229 * 1 if the packet is to be ignored.
231 int batadv_window_protected(struct batadv_priv *bat_priv, int32_t seq_num_diff,
232 unsigned long *last_reset)
234 if (seq_num_diff <= -BATADV_TQ_LOCAL_WINDOW_SIZE ||
235 seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) {
236 if (!batadv_has_timed_out(*last_reset,
237 BATADV_RESET_PROTECTION_MS))
240 *last_reset = jiffies;
241 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
242 "old packet received, start protection\n");
248 bool batadv_check_management_packet(struct sk_buff *skb,
249 struct batadv_hard_iface *hard_iface,
252 struct ethhdr *ethhdr;
254 /* drop packet if it has not necessary minimum size */
255 if (unlikely(!pskb_may_pull(skb, header_len)))
258 ethhdr = (struct ethhdr *)skb_mac_header(skb);
260 /* packet with broadcast indication but unicast recipient */
261 if (!is_broadcast_ether_addr(ethhdr->h_dest))
264 /* packet with broadcast sender address */
265 if (is_broadcast_ether_addr(ethhdr->h_source))
268 /* create a copy of the skb, if needed, to modify it. */
269 if (skb_cow(skb, 0) < 0)
272 /* keep skb linear */
273 if (skb_linearize(skb) < 0)
279 static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv,
280 struct sk_buff *skb, size_t icmp_len)
282 struct batadv_hard_iface *primary_if = NULL;
283 struct batadv_orig_node *orig_node = NULL;
284 struct batadv_icmp_packet_rr *icmp_packet;
285 int ret = NET_RX_DROP;
287 icmp_packet = (struct batadv_icmp_packet_rr *)skb->data;
289 /* add data to device queue */
290 if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) {
291 batadv_socket_receive_packet(icmp_packet, icmp_len);
295 primary_if = batadv_primary_if_get_selected(bat_priv);
299 /* answer echo request (ping) */
300 /* get routing information */
301 orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig);
305 /* create a copy of the skb, if needed, to modify it. */
306 if (skb_cow(skb, ETH_HLEN) < 0)
309 icmp_packet = (struct batadv_icmp_packet_rr *)skb->data;
311 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
312 memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
313 icmp_packet->msg_type = BATADV_ECHO_REPLY;
314 icmp_packet->header.ttl = BATADV_TTL;
316 if (batadv_send_skb_to_orig(skb, orig_node, NULL))
317 ret = NET_RX_SUCCESS;
321 batadv_hardif_free_ref(primary_if);
323 batadv_orig_node_free_ref(orig_node);
327 static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv,
330 struct batadv_hard_iface *primary_if = NULL;
331 struct batadv_orig_node *orig_node = NULL;
332 struct batadv_icmp_packet *icmp_packet;
333 int ret = NET_RX_DROP;
335 icmp_packet = (struct batadv_icmp_packet *)skb->data;
337 /* send TTL exceeded if packet is an echo request (traceroute) */
338 if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) {
339 pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n",
340 icmp_packet->orig, icmp_packet->dst);
344 primary_if = batadv_primary_if_get_selected(bat_priv);
348 /* get routing information */
349 orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig);
353 /* create a copy of the skb, if needed, to modify it. */
354 if (skb_cow(skb, ETH_HLEN) < 0)
357 icmp_packet = (struct batadv_icmp_packet *)skb->data;
359 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
360 memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
361 icmp_packet->msg_type = BATADV_TTL_EXCEEDED;
362 icmp_packet->header.ttl = BATADV_TTL;
364 if (batadv_send_skb_to_orig(skb, orig_node, NULL))
365 ret = NET_RX_SUCCESS;
369 batadv_hardif_free_ref(primary_if);
371 batadv_orig_node_free_ref(orig_node);
376 int batadv_recv_icmp_packet(struct sk_buff *skb,
377 struct batadv_hard_iface *recv_if)
379 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
380 struct batadv_icmp_packet_rr *icmp_packet;
381 struct ethhdr *ethhdr;
382 struct batadv_orig_node *orig_node = NULL;
383 int hdr_size = sizeof(struct batadv_icmp_packet);
384 int ret = NET_RX_DROP;
386 /* we truncate all incoming icmp packets if they don't match our size */
387 if (skb->len >= sizeof(struct batadv_icmp_packet_rr))
388 hdr_size = sizeof(struct batadv_icmp_packet_rr);
390 /* drop packet if it has not necessary minimum size */
391 if (unlikely(!pskb_may_pull(skb, hdr_size)))
394 ethhdr = (struct ethhdr *)skb_mac_header(skb);
396 /* packet with unicast indication but broadcast recipient */
397 if (is_broadcast_ether_addr(ethhdr->h_dest))
400 /* packet with broadcast sender address */
401 if (is_broadcast_ether_addr(ethhdr->h_source))
405 if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest))
408 icmp_packet = (struct batadv_icmp_packet_rr *)skb->data;
410 /* add record route information if not full */
411 if ((hdr_size == sizeof(struct batadv_icmp_packet_rr)) &&
412 (icmp_packet->rr_cur < BATADV_RR_LEN)) {
413 memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]),
414 ethhdr->h_dest, ETH_ALEN);
415 icmp_packet->rr_cur++;
419 if (batadv_is_my_mac(bat_priv, icmp_packet->dst))
420 return batadv_recv_my_icmp_packet(bat_priv, skb, hdr_size);
423 if (icmp_packet->header.ttl < 2)
424 return batadv_recv_icmp_ttl_exceeded(bat_priv, skb);
426 /* get routing information */
427 orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->dst);
431 /* create a copy of the skb, if needed, to modify it. */
432 if (skb_cow(skb, ETH_HLEN) < 0)
435 icmp_packet = (struct batadv_icmp_packet_rr *)skb->data;
438 icmp_packet->header.ttl--;
441 if (batadv_send_skb_to_orig(skb, orig_node, recv_if))
442 ret = NET_RX_SUCCESS;
446 batadv_orig_node_free_ref(orig_node);
450 /* In the bonding case, send the packets in a round
451 * robin fashion over the remaining interfaces.
453 * This method rotates the bonding list and increases the
454 * returned router's refcount.
456 static struct batadv_neigh_node *
457 batadv_find_bond_router(struct batadv_orig_node *primary_orig,
458 const struct batadv_hard_iface *recv_if)
460 struct batadv_neigh_node *tmp_neigh_node;
461 struct batadv_neigh_node *router = NULL, *first_candidate = NULL;
464 list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list,
466 if (!first_candidate)
467 first_candidate = tmp_neigh_node;
469 /* recv_if == NULL on the first node. */
470 if (tmp_neigh_node->if_incoming == recv_if)
473 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
476 router = tmp_neigh_node;
480 /* use the first candidate if nothing was found. */
481 if (!router && first_candidate &&
482 atomic_inc_not_zero(&first_candidate->refcount))
483 router = first_candidate;
488 /* selected should point to the next element
489 * after the current router
491 spin_lock_bh(&primary_orig->neigh_list_lock);
492 /* this is a list_move(), which unfortunately
493 * does not exist as rcu version
495 list_del_rcu(&primary_orig->bond_list);
496 list_add_rcu(&primary_orig->bond_list,
497 &router->bonding_list);
498 spin_unlock_bh(&primary_orig->neigh_list_lock);
505 /* Interface Alternating: Use the best of the
506 * remaining candidates which are not using
509 * Increases the returned router's refcount
511 static struct batadv_neigh_node *
512 batadv_find_ifalter_router(struct batadv_orig_node *primary_orig,
513 const struct batadv_hard_iface *recv_if)
515 struct batadv_neigh_node *tmp_neigh_node;
516 struct batadv_neigh_node *router = NULL, *first_candidate = NULL;
519 list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list,
521 if (!first_candidate)
522 first_candidate = tmp_neigh_node;
524 /* recv_if == NULL on the first node. */
525 if (tmp_neigh_node->if_incoming == recv_if)
528 if (router && tmp_neigh_node->tq_avg <= router->tq_avg)
531 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
534 /* decrement refcount of previously selected router */
536 batadv_neigh_node_free_ref(router);
538 /* we found a better router (or at least one valid router) */
539 router = tmp_neigh_node;
542 /* use the first candidate if nothing was found. */
543 if (!router && first_candidate &&
544 atomic_inc_not_zero(&first_candidate->refcount))
545 router = first_candidate;
551 static int batadv_check_unicast_packet(struct batadv_priv *bat_priv,
552 struct sk_buff *skb, int hdr_size)
554 struct ethhdr *ethhdr;
556 /* drop packet if it has not necessary minimum size */
557 if (unlikely(!pskb_may_pull(skb, hdr_size)))
560 ethhdr = (struct ethhdr *)skb_mac_header(skb);
562 /* packet with unicast indication but broadcast recipient */
563 if (is_broadcast_ether_addr(ethhdr->h_dest))
566 /* packet with broadcast sender address */
567 if (is_broadcast_ether_addr(ethhdr->h_source))
571 if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest))
577 int batadv_recv_tt_query(struct sk_buff *skb, struct batadv_hard_iface *recv_if)
579 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
580 struct batadv_tt_query_packet *tt_query;
582 int hdr_size = sizeof(*tt_query);
586 if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0)
589 /* I could need to modify it */
590 if (skb_cow(skb, sizeof(struct batadv_tt_query_packet)) < 0)
593 tt_query = (struct batadv_tt_query_packet *)skb->data;
595 switch (tt_query->flags & BATADV_TT_QUERY_TYPE_MASK) {
596 case BATADV_TT_REQUEST:
597 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
599 /* If we cannot provide an answer the tt_request is
602 if (!batadv_send_tt_response(bat_priv, tt_query)) {
603 if (tt_query->flags & BATADV_TT_FULL_TABLE)
608 batadv_dbg(BATADV_DBG_TT, bat_priv,
609 "Routing TT_REQUEST to %pM [%c]\n",
612 return batadv_route_unicast_packet(skb, recv_if);
615 case BATADV_TT_RESPONSE:
616 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
618 if (batadv_is_my_mac(bat_priv, tt_query->dst)) {
619 /* packet needs to be linearized to access the TT
622 if (skb_linearize(skb) < 0)
624 /* skb_linearize() possibly changed skb->data */
625 tt_query = (struct batadv_tt_query_packet *)skb->data;
627 tt_size = batadv_tt_len(ntohs(tt_query->tt_data));
629 /* Ensure we have all the claimed data */
630 packet_size = sizeof(struct batadv_tt_query_packet);
631 packet_size += tt_size;
632 if (unlikely(skb_headlen(skb) < packet_size))
635 batadv_handle_tt_response(bat_priv, tt_query);
637 if (tt_query->flags & BATADV_TT_FULL_TABLE)
641 batadv_dbg(BATADV_DBG_TT, bat_priv,
642 "Routing TT_RESPONSE to %pM [%c]\n",
645 return batadv_route_unicast_packet(skb, recv_if);
651 /* returning NET_RX_DROP will make the caller function kfree the skb */
655 int batadv_recv_roam_adv(struct sk_buff *skb, struct batadv_hard_iface *recv_if)
657 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
658 struct batadv_roam_adv_packet *roam_adv_packet;
659 struct batadv_orig_node *orig_node;
661 if (batadv_check_unicast_packet(bat_priv, skb,
662 sizeof(*roam_adv_packet)) < 0)
665 batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
667 roam_adv_packet = (struct batadv_roam_adv_packet *)skb->data;
669 if (!batadv_is_my_mac(bat_priv, roam_adv_packet->dst))
670 return batadv_route_unicast_packet(skb, recv_if);
672 /* check if it is a backbone gateway. we don't accept
673 * roaming advertisement from it, as it has the same
674 * entries as we have.
676 if (batadv_bla_is_backbone_gw_orig(bat_priv, roam_adv_packet->src))
679 orig_node = batadv_orig_hash_find(bat_priv, roam_adv_packet->src);
683 batadv_dbg(BATADV_DBG_TT, bat_priv,
684 "Received ROAMING_ADV from %pM (client %pM)\n",
685 roam_adv_packet->src, roam_adv_packet->client);
687 batadv_tt_global_add(bat_priv, orig_node, roam_adv_packet->client,
688 BATADV_TT_CLIENT_ROAM,
689 atomic_read(&orig_node->last_ttvn) + 1);
691 batadv_orig_node_free_ref(orig_node);
693 /* returning NET_RX_DROP will make the caller function kfree the skb */
697 /* find a suitable router for this originator, and use
698 * bonding if possible. increases the found neighbors
701 struct batadv_neigh_node *
702 batadv_find_router(struct batadv_priv *bat_priv,
703 struct batadv_orig_node *orig_node,
704 const struct batadv_hard_iface *recv_if)
706 struct batadv_orig_node *primary_orig_node;
707 struct batadv_orig_node *router_orig;
708 struct batadv_neigh_node *router;
709 static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
711 uint8_t *primary_addr;
716 router = batadv_orig_node_get_router(orig_node);
720 /* without bonding, the first node should
721 * always choose the default router.
723 bonding_enabled = atomic_read(&bat_priv->bonding);
726 /* select default router to output */
727 router_orig = router->orig_node;
731 if ((!recv_if) && (!bonding_enabled))
734 primary_addr = router_orig->primary_addr;
736 /* if we have something in the primary_addr, we can search
737 * for a potential bonding candidate.
739 if (batadv_compare_eth(primary_addr, zero_mac))
742 /* find the orig_node which has the primary interface. might
743 * even be the same as our router_orig in many cases
745 if (batadv_compare_eth(primary_addr, router_orig->orig)) {
746 primary_orig_node = router_orig;
748 primary_orig_node = batadv_orig_hash_find(bat_priv,
750 if (!primary_orig_node)
753 batadv_orig_node_free_ref(primary_orig_node);
756 /* with less than 2 candidates, we can't do any
757 * bonding and prefer the original router.
759 if (atomic_read(&primary_orig_node->bond_candidates) < 2)
762 /* all nodes between should choose a candidate which
763 * is is not on the interface where the packet came
766 batadv_neigh_node_free_ref(router);
769 router = batadv_find_bond_router(primary_orig_node, recv_if);
771 router = batadv_find_ifalter_router(primary_orig_node, recv_if);
774 if (router && router->if_incoming->if_status != BATADV_IF_ACTIVE)
783 batadv_neigh_node_free_ref(router);
787 static int batadv_route_unicast_packet(struct sk_buff *skb,
788 struct batadv_hard_iface *recv_if)
790 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
791 struct batadv_orig_node *orig_node = NULL;
792 struct batadv_neigh_node *neigh_node = NULL;
793 struct batadv_unicast_packet *unicast_packet;
794 struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb);
795 int ret = NET_RX_DROP;
796 struct sk_buff *new_skb;
798 unicast_packet = (struct batadv_unicast_packet *)skb->data;
801 if (unicast_packet->header.ttl < 2) {
802 pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n",
803 ethhdr->h_source, unicast_packet->dest);
807 /* get routing information */
808 orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest);
813 /* find_router() increases neigh_nodes refcount if found. */
814 neigh_node = batadv_find_router(bat_priv, orig_node, recv_if);
819 /* create a copy of the skb, if needed, to modify it. */
820 if (skb_cow(skb, ETH_HLEN) < 0)
823 unicast_packet = (struct batadv_unicast_packet *)skb->data;
825 if (unicast_packet->header.packet_type == BATADV_UNICAST &&
826 atomic_read(&bat_priv->fragmentation) &&
827 skb->len > neigh_node->if_incoming->net_dev->mtu) {
828 ret = batadv_frag_send_skb(skb, bat_priv,
829 neigh_node->if_incoming,
834 if (unicast_packet->header.packet_type == BATADV_UNICAST_FRAG &&
835 batadv_frag_can_reassemble(skb,
836 neigh_node->if_incoming->net_dev->mtu)) {
837 ret = batadv_frag_reassemble_skb(skb, bat_priv, &new_skb);
839 if (ret == NET_RX_DROP)
842 /* packet was buffered for late merge */
844 ret = NET_RX_SUCCESS;
849 unicast_packet = (struct batadv_unicast_packet *)skb->data;
853 unicast_packet->header.ttl--;
855 /* Update stats counter */
856 batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD);
857 batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES,
858 skb->len + ETH_HLEN);
861 if (batadv_send_skb_to_orig(skb, orig_node, recv_if))
862 ret = NET_RX_SUCCESS;
866 batadv_neigh_node_free_ref(neigh_node);
868 batadv_orig_node_free_ref(orig_node);
873 * batadv_reroute_unicast_packet - update the unicast header for re-routing
874 * @bat_priv: the bat priv with all the soft interface information
875 * @unicast_packet: the unicast header to be updated
876 * @dst_addr: the payload destination
878 * Search the translation table for dst_addr and update the unicast header with
879 * the new corresponding information (originator address where the destination
880 * client currently is and its known TTVN)
882 * Returns true if the packet header has been updated, false otherwise
885 batadv_reroute_unicast_packet(struct batadv_priv *bat_priv,
886 struct batadv_unicast_packet *unicast_packet,
889 struct batadv_orig_node *orig_node = NULL;
890 struct batadv_hard_iface *primary_if = NULL;
892 uint8_t *orig_addr, orig_ttvn;
894 if (batadv_is_my_client(bat_priv, dst_addr)) {
895 primary_if = batadv_primary_if_get_selected(bat_priv);
898 orig_addr = primary_if->net_dev->dev_addr;
899 orig_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
901 orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr);
905 if (batadv_compare_eth(orig_node->orig, unicast_packet->dest))
908 orig_addr = orig_node->orig;
909 orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
912 /* update the packet header */
913 memcpy(unicast_packet->dest, orig_addr, ETH_ALEN);
914 unicast_packet->ttvn = orig_ttvn;
919 batadv_hardif_free_ref(primary_if);
921 batadv_orig_node_free_ref(orig_node);
926 static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv,
927 struct sk_buff *skb) {
928 uint8_t curr_ttvn, old_ttvn;
929 struct batadv_orig_node *orig_node;
930 struct ethhdr *ethhdr;
931 struct batadv_hard_iface *primary_if;
932 struct batadv_unicast_packet *unicast_packet;
935 /* check if there is enough data before accessing it */
936 if (pskb_may_pull(skb, sizeof(*unicast_packet) + ETH_HLEN) < 0)
939 /* create a copy of the skb (in case of for re-routing) to modify it. */
940 if (skb_cow(skb, sizeof(*unicast_packet)) < 0)
943 unicast_packet = (struct batadv_unicast_packet *)skb->data;
944 ethhdr = (struct ethhdr *)(skb->data + sizeof(*unicast_packet));
946 /* check if the destination client was served by this node and it is now
947 * roaming. In this case, it means that the node has got a ROAM_ADV
948 * message and that it knows the new destination in the mesh to re-route
951 if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest)) {
952 if (batadv_reroute_unicast_packet(bat_priv, unicast_packet,
954 net_ratelimited_function(batadv_dbg, BATADV_DBG_TT,
956 "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n",
957 unicast_packet->dest,
959 /* at this point the mesh destination should have been
960 * substituted with the originator address found in the global
961 * table. If not, let the packet go untouched anyway because
962 * there is nothing the node can do
967 /* retrieve the TTVN known by this node for the packet destination. This
968 * value is used later to check if the node which sent (or re-routed
969 * last time) the packet had an updated information or not
971 curr_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
972 if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) {
973 orig_node = batadv_orig_hash_find(bat_priv,
974 unicast_packet->dest);
975 /* if it is not possible to find the orig_node representing the
976 * destination, the packet can immediately be dropped as it will
977 * not be possible to deliver it
982 curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
983 batadv_orig_node_free_ref(orig_node);
986 /* check if the TTVN contained in the packet is fresher than what the
989 is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn);
993 old_ttvn = unicast_packet->ttvn;
994 /* the packet was forged based on outdated network information. Its
995 * destination can possibly be updated and forwarded towards the new
998 if (batadv_reroute_unicast_packet(bat_priv, unicast_packet,
1000 net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, bat_priv,
1001 "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n",
1002 unicast_packet->dest, ethhdr->h_dest,
1003 old_ttvn, curr_ttvn);
1007 /* the packet has not been re-routed: either the destination is
1008 * currently served by this node or there is no destination at all and
1009 * it is possible to drop the packet
1011 if (!batadv_is_my_client(bat_priv, ethhdr->h_dest))
1014 /* update the header in order to let the packet be delivered to this
1015 * node's soft interface
1017 primary_if = batadv_primary_if_get_selected(bat_priv);
1021 memcpy(unicast_packet->dest, primary_if->net_dev->dev_addr, ETH_ALEN);
1023 batadv_hardif_free_ref(primary_if);
1025 unicast_packet->ttvn = curr_ttvn;
1030 int batadv_recv_unicast_packet(struct sk_buff *skb,
1031 struct batadv_hard_iface *recv_if)
1033 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1034 struct batadv_unicast_packet *unicast_packet;
1035 struct batadv_unicast_4addr_packet *unicast_4addr_packet;
1037 struct batadv_orig_node *orig_node = NULL;
1038 int hdr_size = sizeof(*unicast_packet);
1041 unicast_packet = (struct batadv_unicast_packet *)skb->data;
1042 unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
1044 is4addr = unicast_packet->header.packet_type == BATADV_UNICAST_4ADDR;
1045 /* the caller function should have already pulled 2 bytes */
1047 hdr_size = sizeof(*unicast_4addr_packet);
1049 if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0)
1052 if (!batadv_check_unicast_ttvn(bat_priv, skb))
1056 if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) {
1058 batadv_dat_inc_counter(bat_priv,
1059 unicast_4addr_packet->subtype);
1060 orig_addr = unicast_4addr_packet->src;
1061 orig_node = batadv_orig_hash_find(bat_priv, orig_addr);
1064 if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb,
1067 if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb,
1071 batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size,
1076 batadv_orig_node_free_ref(orig_node);
1078 return NET_RX_SUCCESS;
1081 return batadv_route_unicast_packet(skb, recv_if);
1084 int batadv_recv_ucast_frag_packet(struct sk_buff *skb,
1085 struct batadv_hard_iface *recv_if)
1087 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1088 struct batadv_unicast_frag_packet *unicast_packet;
1089 int hdr_size = sizeof(*unicast_packet);
1090 struct sk_buff *new_skb = NULL;
1093 if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0)
1096 if (!batadv_check_unicast_ttvn(bat_priv, skb))
1099 unicast_packet = (struct batadv_unicast_frag_packet *)skb->data;
1102 if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) {
1103 ret = batadv_frag_reassemble_skb(skb, bat_priv, &new_skb);
1105 if (ret == NET_RX_DROP)
1108 /* packet was buffered for late merge */
1110 return NET_RX_SUCCESS;
1112 if (batadv_dat_snoop_incoming_arp_request(bat_priv, new_skb,
1115 if (batadv_dat_snoop_incoming_arp_reply(bat_priv, new_skb,
1119 batadv_interface_rx(recv_if->soft_iface, new_skb, recv_if,
1120 sizeof(struct batadv_unicast_packet), NULL);
1123 return NET_RX_SUCCESS;
1126 return batadv_route_unicast_packet(skb, recv_if);
1130 int batadv_recv_bcast_packet(struct sk_buff *skb,
1131 struct batadv_hard_iface *recv_if)
1133 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1134 struct batadv_orig_node *orig_node = NULL;
1135 struct batadv_bcast_packet *bcast_packet;
1136 struct ethhdr *ethhdr;
1137 int hdr_size = sizeof(*bcast_packet);
1138 int ret = NET_RX_DROP;
1141 /* drop packet if it has not necessary minimum size */
1142 if (unlikely(!pskb_may_pull(skb, hdr_size)))
1145 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1147 /* packet with broadcast indication but unicast recipient */
1148 if (!is_broadcast_ether_addr(ethhdr->h_dest))
1151 /* packet with broadcast sender address */
1152 if (is_broadcast_ether_addr(ethhdr->h_source))
1155 /* ignore broadcasts sent by myself */
1156 if (batadv_is_my_mac(bat_priv, ethhdr->h_source))
1159 bcast_packet = (struct batadv_bcast_packet *)skb->data;
1161 /* ignore broadcasts originated by myself */
1162 if (batadv_is_my_mac(bat_priv, bcast_packet->orig))
1165 if (bcast_packet->header.ttl < 2)
1168 orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig);
1173 spin_lock_bh(&orig_node->bcast_seqno_lock);
1175 /* check whether the packet is a duplicate */
1176 if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno,
1177 ntohl(bcast_packet->seqno)))
1180 seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno;
1182 /* check whether the packet is old and the host just restarted. */
1183 if (batadv_window_protected(bat_priv, seq_diff,
1184 &orig_node->bcast_seqno_reset))
1187 /* mark broadcast in flood history, update window position
1190 if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1))
1191 orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno);
1193 spin_unlock_bh(&orig_node->bcast_seqno_lock);
1195 /* check whether this has been sent by another originator before */
1196 if (batadv_bla_check_bcast_duplist(bat_priv, skb))
1199 /* rebroadcast packet */
1200 batadv_add_bcast_packet_to_list(bat_priv, skb, 1);
1202 /* don't hand the broadcast up if it is from an originator
1203 * from the same backbone.
1205 if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size))
1208 if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size))
1210 if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size))
1213 /* broadcast for me */
1214 batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size,
1218 ret = NET_RX_SUCCESS;
1222 spin_unlock_bh(&orig_node->bcast_seqno_lock);
1225 batadv_orig_node_free_ref(orig_node);
1229 int batadv_recv_vis_packet(struct sk_buff *skb,
1230 struct batadv_hard_iface *recv_if)
1232 struct batadv_vis_packet *vis_packet;
1233 struct ethhdr *ethhdr;
1234 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1235 int hdr_size = sizeof(*vis_packet);
1237 /* keep skb linear */
1238 if (skb_linearize(skb) < 0)
1241 if (unlikely(!pskb_may_pull(skb, hdr_size)))
1244 vis_packet = (struct batadv_vis_packet *)skb->data;
1245 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1248 if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest))
1251 /* ignore own packets */
1252 if (batadv_is_my_mac(bat_priv, vis_packet->vis_orig))
1255 if (batadv_is_my_mac(bat_priv, vis_packet->sender_orig))
1258 switch (vis_packet->vis_type) {
1259 case BATADV_VIS_TYPE_SERVER_SYNC:
1260 batadv_receive_server_sync_packet(bat_priv, vis_packet,
1264 case BATADV_VIS_TYPE_CLIENT_UPDATE:
1265 batadv_receive_client_update_packet(bat_priv, vis_packet,
1269 default: /* ignore unknown packet */
1273 /* We take a copy of the data in the packet, so we should
1274 * always free the skbuf.