1 /* Copyright (C) 2007-2012 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"
32 static int batadv_route_unicast_packet(struct sk_buff *skb,
33 struct hard_iface *recv_if);
35 void batadv_slide_own_bcast_window(struct hard_iface *hard_iface)
37 struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
38 struct hashtable_t *hash = bat_priv->orig_hash;
39 struct hlist_node *node;
40 struct hlist_head *head;
41 struct 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, 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 bat_priv *bat_priv,
66 struct orig_node *orig_node,
67 struct neigh_node *neigh_node)
69 struct neigh_node *curr_router;
71 curr_router = batadv_orig_node_get_router(orig_node);
74 if ((curr_router) && (!neigh_node)) {
75 batadv_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n",
77 batadv_tt_global_del_orig(bat_priv, orig_node,
78 "Deleted route towards originator");
81 } else if ((!curr_router) && (neigh_node)) {
83 batadv_dbg(DBG_ROUTES, bat_priv,
84 "Adding route towards: %pM (via %pM)\n",
85 orig_node->orig, neigh_node->addr);
87 } else if (neigh_node && curr_router) {
88 batadv_dbg(DBG_ROUTES, bat_priv,
89 "Changing route towards: %pM (now via %pM - was via %pM)\n",
90 orig_node->orig, neigh_node->addr,
95 batadv_neigh_node_free_ref(curr_router);
97 /* increase refcount of new best neighbor */
98 if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount))
101 spin_lock_bh(&orig_node->neigh_list_lock);
102 rcu_assign_pointer(orig_node->router, neigh_node);
103 spin_unlock_bh(&orig_node->neigh_list_lock);
105 /* decrease refcount of previous best neighbor */
107 batadv_neigh_node_free_ref(curr_router);
110 void batadv_update_route(struct bat_priv *bat_priv, struct orig_node *orig_node,
111 struct neigh_node *neigh_node)
113 struct 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 orig_node *orig_node,
130 struct 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 orig_node *orig_node,
146 struct neigh_node *neigh_node)
148 struct hlist_node *node;
149 struct neigh_node *tmp_neigh_node, *router = NULL;
150 uint8_t interference_candidate = 0;
152 spin_lock_bh(&orig_node->neigh_list_lock);
154 /* only consider if it has the same primary address ... */
155 if (!batadv_compare_eth(orig_node->orig,
156 neigh_node->orig_node->primary_addr))
159 router = batadv_orig_node_get_router(orig_node);
163 /* ... and is good enough to be considered */
164 if (neigh_node->tq_avg < router->tq_avg - BATADV_BONDING_TQ_THRESHOLD)
167 /* check if we have another candidate with the same mac address or
168 * interface. If we do, we won't select this candidate because of
169 * possible interference.
171 hlist_for_each_entry_rcu(tmp_neigh_node, node,
172 &orig_node->neigh_list, list) {
174 if (tmp_neigh_node == neigh_node)
177 /* we only care if the other candidate is even
178 * considered as candidate.
180 if (list_empty(&tmp_neigh_node->bonding_list))
183 if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) ||
184 (batadv_compare_eth(neigh_node->addr,
185 tmp_neigh_node->addr))) {
186 interference_candidate = 1;
191 /* don't care further if it is an interference candidate */
192 if (interference_candidate)
195 /* this neighbor already is part of our candidate list */
196 if (!list_empty(&neigh_node->bonding_list))
199 if (!atomic_inc_not_zero(&neigh_node->refcount))
202 list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list);
203 atomic_inc(&orig_node->bond_candidates);
207 batadv_bonding_candidate_del(orig_node, neigh_node);
210 spin_unlock_bh(&orig_node->neigh_list_lock);
213 batadv_neigh_node_free_ref(router);
216 /* copy primary address for bonding */
218 batadv_bonding_save_primary(const struct orig_node *orig_node,
219 struct orig_node *orig_neigh_node,
220 const struct batman_ogm_packet *batman_ogm_packet)
222 if (!(batman_ogm_packet->flags & PRIMARIES_FIRST_HOP))
225 memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN);
228 /* checks whether the host restarted and is in the protection time.
230 * 0 if the packet is to be accepted
231 * 1 if the packet is to be ignored.
233 int batadv_window_protected(struct bat_priv *bat_priv, int32_t seq_num_diff,
234 unsigned long *last_reset)
236 if (seq_num_diff <= -BATADV_TQ_LOCAL_WINDOW_SIZE ||
237 seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) {
238 if (!batadv_has_timed_out(*last_reset,
239 BATADV_RESET_PROTECTION_MS))
242 *last_reset = jiffies;
243 batadv_dbg(DBG_BATMAN, bat_priv,
244 "old packet received, start protection\n");
250 bool batadv_check_management_packet(struct sk_buff *skb,
251 struct hard_iface *hard_iface,
254 struct ethhdr *ethhdr;
256 /* drop packet if it has not necessary minimum size */
257 if (unlikely(!pskb_may_pull(skb, header_len)))
260 ethhdr = (struct ethhdr *)skb_mac_header(skb);
262 /* packet with broadcast indication but unicast recipient */
263 if (!is_broadcast_ether_addr(ethhdr->h_dest))
266 /* packet with broadcast sender address */
267 if (is_broadcast_ether_addr(ethhdr->h_source))
270 /* create a copy of the skb, if needed, to modify it. */
271 if (skb_cow(skb, 0) < 0)
274 /* keep skb linear */
275 if (skb_linearize(skb) < 0)
281 static int batadv_recv_my_icmp_packet(struct bat_priv *bat_priv,
282 struct sk_buff *skb, size_t icmp_len)
284 struct hard_iface *primary_if = NULL;
285 struct orig_node *orig_node = NULL;
286 struct neigh_node *router = NULL;
287 struct icmp_packet_rr *icmp_packet;
288 int ret = NET_RX_DROP;
290 icmp_packet = (struct icmp_packet_rr *)skb->data;
292 /* add data to device queue */
293 if (icmp_packet->msg_type != ECHO_REQUEST) {
294 batadv_socket_receive_packet(icmp_packet, icmp_len);
298 primary_if = batadv_primary_if_get_selected(bat_priv);
302 /* answer echo request (ping) */
303 /* get routing information */
304 orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig);
308 router = batadv_orig_node_get_router(orig_node);
312 /* create a copy of the skb, if needed, to modify it. */
313 if (skb_cow(skb, ETH_HLEN) < 0)
316 icmp_packet = (struct icmp_packet_rr *)skb->data;
318 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
319 memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
320 icmp_packet->msg_type = ECHO_REPLY;
321 icmp_packet->header.ttl = BATADV_TTL;
323 batadv_send_skb_packet(skb, router->if_incoming, router->addr);
324 ret = NET_RX_SUCCESS;
328 batadv_hardif_free_ref(primary_if);
330 batadv_neigh_node_free_ref(router);
332 batadv_orig_node_free_ref(orig_node);
336 static int batadv_recv_icmp_ttl_exceeded(struct bat_priv *bat_priv,
339 struct hard_iface *primary_if = NULL;
340 struct orig_node *orig_node = NULL;
341 struct neigh_node *router = NULL;
342 struct icmp_packet *icmp_packet;
343 int ret = NET_RX_DROP;
345 icmp_packet = (struct icmp_packet *)skb->data;
347 /* send TTL exceeded if packet is an echo request (traceroute) */
348 if (icmp_packet->msg_type != ECHO_REQUEST) {
349 pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n",
350 icmp_packet->orig, icmp_packet->dst);
354 primary_if = batadv_primary_if_get_selected(bat_priv);
358 /* get routing information */
359 orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig);
363 router = batadv_orig_node_get_router(orig_node);
367 /* create a copy of the skb, if needed, to modify it. */
368 if (skb_cow(skb, ETH_HLEN) < 0)
371 icmp_packet = (struct icmp_packet *)skb->data;
373 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
374 memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
375 icmp_packet->msg_type = TTL_EXCEEDED;
376 icmp_packet->header.ttl = BATADV_TTL;
378 batadv_send_skb_packet(skb, router->if_incoming, router->addr);
379 ret = NET_RX_SUCCESS;
383 batadv_hardif_free_ref(primary_if);
385 batadv_neigh_node_free_ref(router);
387 batadv_orig_node_free_ref(orig_node);
392 int batadv_recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if)
394 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
395 struct icmp_packet_rr *icmp_packet;
396 struct ethhdr *ethhdr;
397 struct orig_node *orig_node = NULL;
398 struct neigh_node *router = NULL;
399 int hdr_size = sizeof(struct icmp_packet);
400 int ret = NET_RX_DROP;
402 /* we truncate all incoming icmp packets if they don't match our size */
403 if (skb->len >= sizeof(struct icmp_packet_rr))
404 hdr_size = sizeof(struct icmp_packet_rr);
406 /* drop packet if it has not necessary minimum size */
407 if (unlikely(!pskb_may_pull(skb, hdr_size)))
410 ethhdr = (struct ethhdr *)skb_mac_header(skb);
412 /* packet with unicast indication but broadcast recipient */
413 if (is_broadcast_ether_addr(ethhdr->h_dest))
416 /* packet with broadcast sender address */
417 if (is_broadcast_ether_addr(ethhdr->h_source))
421 if (!batadv_is_my_mac(ethhdr->h_dest))
424 icmp_packet = (struct icmp_packet_rr *)skb->data;
426 /* add record route information if not full */
427 if ((hdr_size == sizeof(struct icmp_packet_rr)) &&
428 (icmp_packet->rr_cur < BATADV_RR_LEN)) {
429 memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]),
430 ethhdr->h_dest, ETH_ALEN);
431 icmp_packet->rr_cur++;
435 if (batadv_is_my_mac(icmp_packet->dst))
436 return batadv_recv_my_icmp_packet(bat_priv, skb, hdr_size);
439 if (icmp_packet->header.ttl < 2)
440 return batadv_recv_icmp_ttl_exceeded(bat_priv, skb);
442 /* get routing information */
443 orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->dst);
447 router = batadv_orig_node_get_router(orig_node);
451 /* create a copy of the skb, if needed, to modify it. */
452 if (skb_cow(skb, ETH_HLEN) < 0)
455 icmp_packet = (struct icmp_packet_rr *)skb->data;
458 icmp_packet->header.ttl--;
461 batadv_send_skb_packet(skb, router->if_incoming, router->addr);
462 ret = NET_RX_SUCCESS;
466 batadv_neigh_node_free_ref(router);
468 batadv_orig_node_free_ref(orig_node);
472 /* In the bonding case, send the packets in a round
473 * robin fashion over the remaining interfaces.
475 * This method rotates the bonding list and increases the
476 * returned router's refcount.
478 static struct neigh_node *
479 batadv_find_bond_router(struct orig_node *primary_orig,
480 const struct hard_iface *recv_if)
482 struct neigh_node *tmp_neigh_node;
483 struct neigh_node *router = NULL, *first_candidate = NULL;
486 list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list,
488 if (!first_candidate)
489 first_candidate = tmp_neigh_node;
491 /* recv_if == NULL on the first node. */
492 if (tmp_neigh_node->if_incoming == recv_if)
495 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
498 router = tmp_neigh_node;
502 /* use the first candidate if nothing was found. */
503 if (!router && first_candidate &&
504 atomic_inc_not_zero(&first_candidate->refcount))
505 router = first_candidate;
510 /* selected should point to the next element
511 * after the current router
513 spin_lock_bh(&primary_orig->neigh_list_lock);
514 /* this is a list_move(), which unfortunately
515 * does not exist as rcu version
517 list_del_rcu(&primary_orig->bond_list);
518 list_add_rcu(&primary_orig->bond_list,
519 &router->bonding_list);
520 spin_unlock_bh(&primary_orig->neigh_list_lock);
527 /* Interface Alternating: Use the best of the
528 * remaining candidates which are not using
531 * Increases the returned router's refcount
533 static struct neigh_node *
534 batadv_find_ifalter_router(struct orig_node *primary_orig,
535 const struct hard_iface *recv_if)
537 struct neigh_node *tmp_neigh_node;
538 struct neigh_node *router = NULL, *first_candidate = NULL;
541 list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list,
543 if (!first_candidate)
544 first_candidate = tmp_neigh_node;
546 /* recv_if == NULL on the first node. */
547 if (tmp_neigh_node->if_incoming == recv_if)
550 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
553 /* if we don't have a router yet
554 * or this one is better, choose it.
557 (tmp_neigh_node->tq_avg > router->tq_avg)) {
558 /* decrement refcount of
559 * previously selected router
562 batadv_neigh_node_free_ref(router);
564 router = tmp_neigh_node;
565 atomic_inc_not_zero(&router->refcount);
568 batadv_neigh_node_free_ref(tmp_neigh_node);
571 /* use the first candidate if nothing was found. */
572 if (!router && first_candidate &&
573 atomic_inc_not_zero(&first_candidate->refcount))
574 router = first_candidate;
580 int batadv_recv_tt_query(struct sk_buff *skb, struct hard_iface *recv_if)
582 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
583 struct tt_query_packet *tt_query;
585 struct ethhdr *ethhdr;
588 /* drop packet if it has not necessary minimum size */
589 if (unlikely(!pskb_may_pull(skb, sizeof(struct tt_query_packet))))
592 /* I could need to modify it */
593 if (skb_cow(skb, sizeof(struct tt_query_packet)) < 0)
596 ethhdr = (struct ethhdr *)skb_mac_header(skb);
598 /* packet with unicast indication but broadcast recipient */
599 if (is_broadcast_ether_addr(ethhdr->h_dest))
602 /* packet with broadcast sender address */
603 if (is_broadcast_ether_addr(ethhdr->h_source))
606 tt_query = (struct tt_query_packet *)skb->data;
608 switch (tt_query->flags & BATADV_TT_QUERY_TYPE_MASK) {
610 batadv_inc_counter(bat_priv, BAT_CNT_TT_REQUEST_RX);
612 /* If we cannot provide an answer the tt_request is
615 if (!batadv_send_tt_response(bat_priv, tt_query)) {
616 tt_flag = tt_query->flags & TT_FULL_TABLE ? 'F' : '.';
617 batadv_dbg(DBG_TT, bat_priv,
618 "Routing TT_REQUEST to %pM [%c]\n",
621 return batadv_route_unicast_packet(skb, recv_if);
625 batadv_inc_counter(bat_priv, BAT_CNT_TT_RESPONSE_RX);
627 if (batadv_is_my_mac(tt_query->dst)) {
628 /* packet needs to be linearized to access the TT
631 if (skb_linearize(skb) < 0)
633 /* skb_linearize() possibly changed skb->data */
634 tt_query = (struct tt_query_packet *)skb->data;
636 tt_size = batadv_tt_len(ntohs(tt_query->tt_data));
638 /* Ensure we have all the claimed data */
639 if (unlikely(skb_headlen(skb) <
640 sizeof(struct tt_query_packet) + tt_size))
643 batadv_handle_tt_response(bat_priv, tt_query);
645 tt_flag = tt_query->flags & TT_FULL_TABLE ? 'F' : '.';
646 batadv_dbg(DBG_TT, bat_priv,
647 "Routing TT_RESPONSE to %pM [%c]\n",
650 return batadv_route_unicast_packet(skb, recv_if);
656 /* returning NET_RX_DROP will make the caller function kfree the skb */
660 int batadv_recv_roam_adv(struct sk_buff *skb, struct hard_iface *recv_if)
662 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
663 struct roam_adv_packet *roam_adv_packet;
664 struct orig_node *orig_node;
665 struct ethhdr *ethhdr;
667 /* drop packet if it has not necessary minimum size */
668 if (unlikely(!pskb_may_pull(skb, sizeof(struct roam_adv_packet))))
671 ethhdr = (struct ethhdr *)skb_mac_header(skb);
673 /* packet with unicast indication but broadcast recipient */
674 if (is_broadcast_ether_addr(ethhdr->h_dest))
677 /* packet with broadcast sender address */
678 if (is_broadcast_ether_addr(ethhdr->h_source))
681 batadv_inc_counter(bat_priv, BAT_CNT_TT_ROAM_ADV_RX);
683 roam_adv_packet = (struct roam_adv_packet *)skb->data;
685 if (!batadv_is_my_mac(roam_adv_packet->dst))
686 return batadv_route_unicast_packet(skb, recv_if);
688 /* check if it is a backbone gateway. we don't accept
689 * roaming advertisement from it, as it has the same
690 * entries as we have.
692 if (batadv_bla_is_backbone_gw_orig(bat_priv, roam_adv_packet->src))
695 orig_node = batadv_orig_hash_find(bat_priv, roam_adv_packet->src);
699 batadv_dbg(DBG_TT, bat_priv,
700 "Received ROAMING_ADV from %pM (client %pM)\n",
701 roam_adv_packet->src, roam_adv_packet->client);
703 batadv_tt_global_add(bat_priv, orig_node, roam_adv_packet->client,
705 atomic_read(&orig_node->last_ttvn) + 1);
707 /* Roaming phase starts: I have new information but the ttvn has not
708 * been incremented yet. This flag will make me check all the incoming
709 * packets for the correct destination.
711 bat_priv->tt_poss_change = true;
713 batadv_orig_node_free_ref(orig_node);
715 /* returning NET_RX_DROP will make the caller function kfree the skb */
719 /* find a suitable router for this originator, and use
720 * bonding if possible. increases the found neighbors
723 struct neigh_node *batadv_find_router(struct bat_priv *bat_priv,
724 struct orig_node *orig_node,
725 const struct hard_iface *recv_if)
727 struct orig_node *primary_orig_node;
728 struct orig_node *router_orig;
729 struct neigh_node *router;
730 static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
732 uint8_t *primary_addr;
737 router = batadv_orig_node_get_router(orig_node);
741 /* without bonding, the first node should
742 * always choose the default router.
744 bonding_enabled = atomic_read(&bat_priv->bonding);
747 /* select default router to output */
748 router_orig = router->orig_node;
752 if ((!recv_if) && (!bonding_enabled))
755 primary_addr = router_orig->primary_addr;
757 /* if we have something in the primary_addr, we can search
758 * for a potential bonding candidate.
760 if (batadv_compare_eth(primary_addr, zero_mac))
763 /* find the orig_node which has the primary interface. might
764 * even be the same as our router_orig in many cases
766 if (batadv_compare_eth(primary_addr, router_orig->orig)) {
767 primary_orig_node = router_orig;
769 primary_orig_node = batadv_orig_hash_find(bat_priv,
771 if (!primary_orig_node)
774 batadv_orig_node_free_ref(primary_orig_node);
777 /* with less than 2 candidates, we can't do any
778 * bonding and prefer the original router.
780 if (atomic_read(&primary_orig_node->bond_candidates) < 2)
783 /* all nodes between should choose a candidate which
784 * is is not on the interface where the packet came
787 batadv_neigh_node_free_ref(router);
790 router = batadv_find_bond_router(primary_orig_node, recv_if);
792 router = batadv_find_ifalter_router(primary_orig_node, recv_if);
795 if (router && router->if_incoming->if_status != IF_ACTIVE)
804 batadv_neigh_node_free_ref(router);
808 static int batadv_check_unicast_packet(struct sk_buff *skb, int hdr_size)
810 struct ethhdr *ethhdr;
812 /* drop packet if it has not necessary minimum size */
813 if (unlikely(!pskb_may_pull(skb, hdr_size)))
816 ethhdr = (struct ethhdr *)skb_mac_header(skb);
818 /* packet with unicast indication but broadcast recipient */
819 if (is_broadcast_ether_addr(ethhdr->h_dest))
822 /* packet with broadcast sender address */
823 if (is_broadcast_ether_addr(ethhdr->h_source))
827 if (!batadv_is_my_mac(ethhdr->h_dest))
833 static int batadv_route_unicast_packet(struct sk_buff *skb,
834 struct hard_iface *recv_if)
836 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
837 struct orig_node *orig_node = NULL;
838 struct neigh_node *neigh_node = NULL;
839 struct unicast_packet *unicast_packet;
840 struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb);
841 int ret = NET_RX_DROP;
842 struct sk_buff *new_skb;
844 unicast_packet = (struct unicast_packet *)skb->data;
847 if (unicast_packet->header.ttl < 2) {
848 pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n",
849 ethhdr->h_source, unicast_packet->dest);
853 /* get routing information */
854 orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest);
859 /* find_router() increases neigh_nodes refcount if found. */
860 neigh_node = batadv_find_router(bat_priv, orig_node, recv_if);
865 /* create a copy of the skb, if needed, to modify it. */
866 if (skb_cow(skb, ETH_HLEN) < 0)
869 unicast_packet = (struct unicast_packet *)skb->data;
871 if (unicast_packet->header.packet_type == BAT_UNICAST &&
872 atomic_read(&bat_priv->fragmentation) &&
873 skb->len > neigh_node->if_incoming->net_dev->mtu) {
874 ret = batadv_frag_send_skb(skb, bat_priv,
875 neigh_node->if_incoming,
880 if (unicast_packet->header.packet_type == BAT_UNICAST_FRAG &&
881 batadv_frag_can_reassemble(skb,
882 neigh_node->if_incoming->net_dev->mtu)) {
884 ret = batadv_frag_reassemble_skb(skb, bat_priv, &new_skb);
886 if (ret == NET_RX_DROP)
889 /* packet was buffered for late merge */
891 ret = NET_RX_SUCCESS;
896 unicast_packet = (struct unicast_packet *)skb->data;
900 unicast_packet->header.ttl--;
902 /* Update stats counter */
903 batadv_inc_counter(bat_priv, BAT_CNT_FORWARD);
904 batadv_add_counter(bat_priv, BAT_CNT_FORWARD_BYTES,
905 skb->len + ETH_HLEN);
908 batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
909 ret = NET_RX_SUCCESS;
913 batadv_neigh_node_free_ref(neigh_node);
915 batadv_orig_node_free_ref(orig_node);
919 static int batadv_check_unicast_ttvn(struct bat_priv *bat_priv,
920 struct sk_buff *skb) {
922 struct orig_node *orig_node;
923 struct ethhdr *ethhdr;
924 struct hard_iface *primary_if;
925 struct unicast_packet *unicast_packet;
929 /* I could need to modify it */
930 if (skb_cow(skb, sizeof(struct unicast_packet)) < 0)
933 unicast_packet = (struct unicast_packet *)skb->data;
935 if (batadv_is_my_mac(unicast_packet->dest)) {
936 tt_poss_change = bat_priv->tt_poss_change;
937 curr_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
939 orig_node = batadv_orig_hash_find(bat_priv,
940 unicast_packet->dest);
945 curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
946 tt_poss_change = orig_node->tt_poss_change;
947 batadv_orig_node_free_ref(orig_node);
950 /* Check whether I have to reroute the packet */
951 is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn);
952 if (is_old_ttvn || tt_poss_change) {
953 /* check if there is enough data before accessing it */
954 if (pskb_may_pull(skb, sizeof(struct unicast_packet) +
958 ethhdr = (struct ethhdr *)(skb->data +
959 sizeof(struct unicast_packet));
961 /* we don't have an updated route for this client, so we should
962 * not try to reroute the packet!!
964 if (batadv_tt_global_client_is_roaming(bat_priv,
968 orig_node = batadv_transtable_search(bat_priv, NULL,
972 if (!batadv_is_my_client(bat_priv, ethhdr->h_dest))
974 primary_if = batadv_primary_if_get_selected(bat_priv);
977 memcpy(unicast_packet->dest,
978 primary_if->net_dev->dev_addr, ETH_ALEN);
979 batadv_hardif_free_ref(primary_if);
981 memcpy(unicast_packet->dest, orig_node->orig,
983 curr_ttvn = (uint8_t)
984 atomic_read(&orig_node->last_ttvn);
985 batadv_orig_node_free_ref(orig_node);
988 batadv_dbg(DBG_ROUTES, bat_priv,
989 "TTVN mismatch (old_ttvn %u new_ttvn %u)! Rerouting unicast packet (for %pM) to %pM\n",
990 unicast_packet->ttvn, curr_ttvn, ethhdr->h_dest,
991 unicast_packet->dest);
993 unicast_packet->ttvn = curr_ttvn;
998 int batadv_recv_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
1000 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1001 struct unicast_packet *unicast_packet;
1002 int hdr_size = sizeof(*unicast_packet);
1004 if (batadv_check_unicast_packet(skb, hdr_size) < 0)
1007 if (!batadv_check_unicast_ttvn(bat_priv, skb))
1010 unicast_packet = (struct unicast_packet *)skb->data;
1013 if (batadv_is_my_mac(unicast_packet->dest)) {
1014 batadv_interface_rx(recv_if->soft_iface, skb, recv_if,
1016 return NET_RX_SUCCESS;
1019 return batadv_route_unicast_packet(skb, recv_if);
1022 int batadv_recv_ucast_frag_packet(struct sk_buff *skb,
1023 struct hard_iface *recv_if)
1025 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1026 struct unicast_frag_packet *unicast_packet;
1027 int hdr_size = sizeof(*unicast_packet);
1028 struct sk_buff *new_skb = NULL;
1031 if (batadv_check_unicast_packet(skb, hdr_size) < 0)
1034 if (!batadv_check_unicast_ttvn(bat_priv, skb))
1037 unicast_packet = (struct unicast_frag_packet *)skb->data;
1040 if (batadv_is_my_mac(unicast_packet->dest)) {
1042 ret = batadv_frag_reassemble_skb(skb, bat_priv, &new_skb);
1044 if (ret == NET_RX_DROP)
1047 /* packet was buffered for late merge */
1049 return NET_RX_SUCCESS;
1051 batadv_interface_rx(recv_if->soft_iface, new_skb, recv_if,
1052 sizeof(struct unicast_packet));
1053 return NET_RX_SUCCESS;
1056 return batadv_route_unicast_packet(skb, recv_if);
1060 int batadv_recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
1062 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1063 struct orig_node *orig_node = NULL;
1064 struct bcast_packet *bcast_packet;
1065 struct ethhdr *ethhdr;
1066 int hdr_size = sizeof(*bcast_packet);
1067 int ret = NET_RX_DROP;
1070 /* drop packet if it has not necessary minimum size */
1071 if (unlikely(!pskb_may_pull(skb, hdr_size)))
1074 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1076 /* packet with broadcast indication but unicast recipient */
1077 if (!is_broadcast_ether_addr(ethhdr->h_dest))
1080 /* packet with broadcast sender address */
1081 if (is_broadcast_ether_addr(ethhdr->h_source))
1084 /* ignore broadcasts sent by myself */
1085 if (batadv_is_my_mac(ethhdr->h_source))
1088 bcast_packet = (struct bcast_packet *)skb->data;
1090 /* ignore broadcasts originated by myself */
1091 if (batadv_is_my_mac(bcast_packet->orig))
1094 if (bcast_packet->header.ttl < 2)
1097 orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig);
1102 spin_lock_bh(&orig_node->bcast_seqno_lock);
1104 /* check whether the packet is a duplicate */
1105 if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno,
1106 ntohl(bcast_packet->seqno)))
1109 seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno;
1111 /* check whether the packet is old and the host just restarted. */
1112 if (batadv_window_protected(bat_priv, seq_diff,
1113 &orig_node->bcast_seqno_reset))
1116 /* mark broadcast in flood history, update window position
1119 if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1))
1120 orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno);
1122 spin_unlock_bh(&orig_node->bcast_seqno_lock);
1124 /* check whether this has been sent by another originator before */
1125 if (batadv_bla_check_bcast_duplist(bat_priv, bcast_packet, hdr_size))
1128 /* rebroadcast packet */
1129 batadv_add_bcast_packet_to_list(bat_priv, skb, 1);
1131 /* don't hand the broadcast up if it is from an originator
1132 * from the same backbone.
1134 if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size))
1137 /* broadcast for me */
1138 batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size);
1139 ret = NET_RX_SUCCESS;
1143 spin_unlock_bh(&orig_node->bcast_seqno_lock);
1146 batadv_orig_node_free_ref(orig_node);
1150 int batadv_recv_vis_packet(struct sk_buff *skb, struct hard_iface *recv_if)
1152 struct vis_packet *vis_packet;
1153 struct ethhdr *ethhdr;
1154 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1155 int hdr_size = sizeof(*vis_packet);
1157 /* keep skb linear */
1158 if (skb_linearize(skb) < 0)
1161 if (unlikely(!pskb_may_pull(skb, hdr_size)))
1164 vis_packet = (struct vis_packet *)skb->data;
1165 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1168 if (!batadv_is_my_mac(ethhdr->h_dest))
1171 /* ignore own packets */
1172 if (batadv_is_my_mac(vis_packet->vis_orig))
1175 if (batadv_is_my_mac(vis_packet->sender_orig))
1178 switch (vis_packet->vis_type) {
1179 case VIS_TYPE_SERVER_SYNC:
1180 batadv_receive_server_sync_packet(bat_priv, vis_packet,
1184 case VIS_TYPE_CLIENT_UPDATE:
1185 batadv_receive_client_update_packet(bat_priv, vis_packet,
1189 default: /* ignore unknown packet */
1193 /* We take a copy of the data in the packet, so we should
1194 * always free the skbuf.