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
25 #include "soft-interface.h"
26 #include "hard-interface.h"
27 #include "icmp_socket.h"
28 #include "translation-table.h"
29 #include "originator.h"
34 void slide_own_bcast_window(struct hard_iface *hard_iface)
36 struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
37 struct hashtable_t *hash = bat_priv->orig_hash;
38 struct hlist_node *node;
39 struct hlist_head *head;
40 struct orig_node *orig_node;
45 for (i = 0; i < hash->size; i++) {
46 head = &hash->table[i];
49 hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
50 spin_lock_bh(&orig_node->ogm_cnt_lock);
51 word_index = hard_iface->if_num * NUM_WORDS;
52 word = &(orig_node->bcast_own[word_index]);
54 bit_get_packet(bat_priv, word, 1, 0);
55 orig_node->bcast_own_sum[hard_iface->if_num] =
56 bit_packet_count(word);
57 spin_unlock_bh(&orig_node->ogm_cnt_lock);
63 static void _update_route(struct bat_priv *bat_priv,
64 struct orig_node *orig_node,
65 struct neigh_node *neigh_node)
67 struct neigh_node *curr_router;
69 curr_router = orig_node_get_router(orig_node);
72 if ((curr_router) && (!neigh_node)) {
73 bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n",
75 tt_global_del_orig(bat_priv, orig_node,
76 "Deleted route towards originator");
79 } else if ((!curr_router) && (neigh_node)) {
81 bat_dbg(DBG_ROUTES, bat_priv,
82 "Adding route towards: %pM (via %pM)\n",
83 orig_node->orig, neigh_node->addr);
85 } else if (neigh_node && curr_router) {
86 bat_dbg(DBG_ROUTES, bat_priv,
87 "Changing route towards: %pM "
88 "(now via %pM - was via %pM)\n",
89 orig_node->orig, neigh_node->addr,
94 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 neigh_node_free_ref(curr_router);
109 void update_route(struct bat_priv *bat_priv, struct orig_node *orig_node,
110 struct neigh_node *neigh_node)
112 struct neigh_node *router = NULL;
117 router = orig_node_get_router(orig_node);
119 if (router != neigh_node)
120 _update_route(bat_priv, orig_node, neigh_node);
124 neigh_node_free_ref(router);
127 /* caller must hold the neigh_list_lock */
128 void bonding_candidate_del(struct orig_node *orig_node,
129 struct neigh_node *neigh_node)
131 /* this neighbor is not part of our candidate list */
132 if (list_empty(&neigh_node->bonding_list))
135 list_del_rcu(&neigh_node->bonding_list);
136 INIT_LIST_HEAD(&neigh_node->bonding_list);
137 neigh_node_free_ref(neigh_node);
138 atomic_dec(&orig_node->bond_candidates);
144 void bonding_candidate_add(struct orig_node *orig_node,
145 struct neigh_node *neigh_node)
147 struct hlist_node *node;
148 struct 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 (!compare_eth(orig_node->orig,
155 neigh_node->orig_node->primary_addr))
158 router = orig_node_get_router(orig_node);
162 /* ... and is good enough to be considered */
163 if (neigh_node->tq_avg < router->tq_avg - 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. */
179 if (list_empty(&tmp_neigh_node->bonding_list))
182 if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) ||
183 (compare_eth(neigh_node->addr, 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 bonding_candidate_del(orig_node, neigh_node);
208 spin_unlock_bh(&orig_node->neigh_list_lock);
211 neigh_node_free_ref(router);
214 /* copy primary address for bonding */
215 void bonding_save_primary(const struct orig_node *orig_node,
216 struct orig_node *orig_neigh_node,
217 const struct batman_ogm_packet *batman_ogm_packet)
219 if (!(batman_ogm_packet->flags & PRIMARIES_FIRST_HOP))
222 memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN);
225 /* checks whether the host restarted and is in the protection time.
227 * 0 if the packet is to be accepted
228 * 1 if the packet is to be ignored.
230 int window_protected(struct bat_priv *bat_priv, int32_t seq_num_diff,
231 unsigned long *last_reset)
233 if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE)
234 || (seq_num_diff >= EXPECTED_SEQNO_RANGE)) {
235 if (time_after(jiffies, *last_reset +
236 msecs_to_jiffies(RESET_PROTECTION_MS))) {
238 *last_reset = jiffies;
239 bat_dbg(DBG_BATMAN, bat_priv,
240 "old packet received, start protection\n");
249 int recv_bat_ogm_packet(struct sk_buff *skb, struct hard_iface *hard_iface)
251 struct ethhdr *ethhdr;
253 /* drop packet if it has not necessary minimum size */
254 if (unlikely(!pskb_may_pull(skb, BATMAN_OGM_LEN)))
257 ethhdr = (struct ethhdr *)skb_mac_header(skb);
259 /* packet with broadcast indication but unicast recipient */
260 if (!is_broadcast_ether_addr(ethhdr->h_dest))
263 /* packet with broadcast sender address */
264 if (is_broadcast_ether_addr(ethhdr->h_source))
267 /* create a copy of the skb, if needed, to modify it. */
268 if (skb_cow(skb, 0) < 0)
271 /* keep skb linear */
272 if (skb_linearize(skb) < 0)
275 ethhdr = (struct ethhdr *)skb_mac_header(skb);
277 bat_ogm_receive(ethhdr, skb->data, skb_headlen(skb), hard_iface);
280 return NET_RX_SUCCESS;
283 static int recv_my_icmp_packet(struct bat_priv *bat_priv,
284 struct sk_buff *skb, size_t icmp_len)
286 struct hard_iface *primary_if = NULL;
287 struct orig_node *orig_node = NULL;
288 struct neigh_node *router = NULL;
289 struct icmp_packet_rr *icmp_packet;
290 int ret = NET_RX_DROP;
292 icmp_packet = (struct icmp_packet_rr *)skb->data;
294 /* add data to device queue */
295 if (icmp_packet->msg_type != ECHO_REQUEST) {
296 bat_socket_receive_packet(icmp_packet, icmp_len);
300 primary_if = primary_if_get_selected(bat_priv);
304 /* answer echo request (ping) */
305 /* get routing information */
306 orig_node = orig_hash_find(bat_priv, icmp_packet->orig);
310 router = orig_node_get_router(orig_node);
314 /* create a copy of the skb, if needed, to modify it. */
315 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
318 icmp_packet = (struct icmp_packet_rr *)skb->data;
320 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
321 memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
322 icmp_packet->msg_type = ECHO_REPLY;
323 icmp_packet->ttl = TTL;
325 send_skb_packet(skb, router->if_incoming, router->addr);
326 ret = NET_RX_SUCCESS;
330 hardif_free_ref(primary_if);
332 neigh_node_free_ref(router);
334 orig_node_free_ref(orig_node);
338 static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv,
341 struct hard_iface *primary_if = NULL;
342 struct orig_node *orig_node = NULL;
343 struct neigh_node *router = NULL;
344 struct icmp_packet *icmp_packet;
345 int ret = NET_RX_DROP;
347 icmp_packet = (struct icmp_packet *)skb->data;
349 /* send TTL exceeded if packet is an echo request (traceroute) */
350 if (icmp_packet->msg_type != ECHO_REQUEST) {
351 pr_debug("Warning - can't forward icmp packet from %pM to "
352 "%pM: ttl exceeded\n", icmp_packet->orig,
357 primary_if = primary_if_get_selected(bat_priv);
361 /* get routing information */
362 orig_node = orig_hash_find(bat_priv, icmp_packet->orig);
366 router = orig_node_get_router(orig_node);
370 /* create a copy of the skb, if needed, to modify it. */
371 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
374 icmp_packet = (struct icmp_packet *)skb->data;
376 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
377 memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
378 icmp_packet->msg_type = TTL_EXCEEDED;
379 icmp_packet->ttl = TTL;
381 send_skb_packet(skb, router->if_incoming, router->addr);
382 ret = NET_RX_SUCCESS;
386 hardif_free_ref(primary_if);
388 neigh_node_free_ref(router);
390 orig_node_free_ref(orig_node);
395 int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if)
397 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
398 struct icmp_packet_rr *icmp_packet;
399 struct ethhdr *ethhdr;
400 struct orig_node *orig_node = NULL;
401 struct neigh_node *router = NULL;
402 int hdr_size = sizeof(struct icmp_packet);
403 int ret = NET_RX_DROP;
406 * we truncate all incoming icmp packets if they don't match our size
408 if (skb->len >= sizeof(struct icmp_packet_rr))
409 hdr_size = sizeof(struct icmp_packet_rr);
411 /* drop packet if it has not necessary minimum size */
412 if (unlikely(!pskb_may_pull(skb, hdr_size)))
415 ethhdr = (struct ethhdr *)skb_mac_header(skb);
417 /* packet with unicast indication but broadcast recipient */
418 if (is_broadcast_ether_addr(ethhdr->h_dest))
421 /* packet with broadcast sender address */
422 if (is_broadcast_ether_addr(ethhdr->h_source))
426 if (!is_my_mac(ethhdr->h_dest))
429 icmp_packet = (struct icmp_packet_rr *)skb->data;
431 /* add record route information if not full */
432 if ((hdr_size == sizeof(struct icmp_packet_rr)) &&
433 (icmp_packet->rr_cur < BAT_RR_LEN)) {
434 memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]),
435 ethhdr->h_dest, ETH_ALEN);
436 icmp_packet->rr_cur++;
440 if (is_my_mac(icmp_packet->dst))
441 return recv_my_icmp_packet(bat_priv, skb, hdr_size);
444 if (icmp_packet->ttl < 2)
445 return recv_icmp_ttl_exceeded(bat_priv, skb);
447 /* get routing information */
448 orig_node = orig_hash_find(bat_priv, icmp_packet->dst);
452 router = orig_node_get_router(orig_node);
456 /* create a copy of the skb, if needed, to modify it. */
457 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
460 icmp_packet = (struct icmp_packet_rr *)skb->data;
466 send_skb_packet(skb, router->if_incoming, router->addr);
467 ret = NET_RX_SUCCESS;
471 neigh_node_free_ref(router);
473 orig_node_free_ref(orig_node);
477 /* In the bonding case, send the packets in a round
478 * robin fashion over the remaining interfaces.
480 * This method rotates the bonding list and increases the
481 * returned router's refcount. */
482 static struct neigh_node *find_bond_router(struct orig_node *primary_orig,
483 const struct hard_iface *recv_if)
485 struct neigh_node *tmp_neigh_node;
486 struct neigh_node *router = NULL, *first_candidate = NULL;
489 list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list,
491 if (!first_candidate)
492 first_candidate = tmp_neigh_node;
494 /* recv_if == NULL on the first node. */
495 if (tmp_neigh_node->if_incoming == recv_if)
498 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
501 router = tmp_neigh_node;
505 /* use the first candidate if nothing was found. */
506 if (!router && first_candidate &&
507 atomic_inc_not_zero(&first_candidate->refcount))
508 router = first_candidate;
513 /* selected should point to the next element
514 * after the current router */
515 spin_lock_bh(&primary_orig->neigh_list_lock);
516 /* this is a list_move(), which unfortunately
517 * does not exist as rcu version */
518 list_del_rcu(&primary_orig->bond_list);
519 list_add_rcu(&primary_orig->bond_list,
520 &router->bonding_list);
521 spin_unlock_bh(&primary_orig->neigh_list_lock);
528 /* Interface Alternating: Use the best of the
529 * remaining candidates which are not using
532 * Increases the returned router's refcount */
533 static struct neigh_node *find_ifalter_router(struct orig_node *primary_orig,
534 const struct hard_iface *recv_if)
536 struct neigh_node *tmp_neigh_node;
537 struct neigh_node *router = NULL, *first_candidate = NULL;
540 list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list,
542 if (!first_candidate)
543 first_candidate = tmp_neigh_node;
545 /* recv_if == NULL on the first node. */
546 if (tmp_neigh_node->if_incoming == recv_if)
549 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
552 /* if we don't have a router yet
553 * or this one is better, choose it. */
555 (tmp_neigh_node->tq_avg > router->tq_avg)) {
556 /* decrement refcount of
557 * previously selected router */
559 neigh_node_free_ref(router);
561 router = tmp_neigh_node;
562 atomic_inc_not_zero(&router->refcount);
565 neigh_node_free_ref(tmp_neigh_node);
568 /* use the first candidate if nothing was found. */
569 if (!router && first_candidate &&
570 atomic_inc_not_zero(&first_candidate->refcount))
571 router = first_candidate;
577 int recv_tt_query(struct sk_buff *skb, struct hard_iface *recv_if)
579 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
580 struct tt_query_packet *tt_query;
582 struct ethhdr *ethhdr;
584 /* drop packet if it has not necessary minimum size */
585 if (unlikely(!pskb_may_pull(skb, sizeof(struct tt_query_packet))))
588 /* I could need to modify it */
589 if (skb_cow(skb, sizeof(struct tt_query_packet)) < 0)
592 ethhdr = (struct ethhdr *)skb_mac_header(skb);
594 /* packet with unicast indication but broadcast recipient */
595 if (is_broadcast_ether_addr(ethhdr->h_dest))
598 /* packet with broadcast sender address */
599 if (is_broadcast_ether_addr(ethhdr->h_source))
602 tt_query = (struct tt_query_packet *)skb->data;
604 tt_query->tt_data = ntohs(tt_query->tt_data);
606 switch (tt_query->flags & TT_QUERY_TYPE_MASK) {
608 /* If we cannot provide an answer the tt_request is
610 if (!send_tt_response(bat_priv, tt_query)) {
611 bat_dbg(DBG_TT, bat_priv,
612 "Routing TT_REQUEST to %pM [%c]\n",
614 (tt_query->flags & TT_FULL_TABLE ? 'F' : '.'));
615 tt_query->tt_data = htons(tt_query->tt_data);
616 return route_unicast_packet(skb, recv_if);
620 if (is_my_mac(tt_query->dst)) {
621 /* packet needs to be linearized to access the TT
623 if (skb_linearize(skb) < 0)
626 tt_len = tt_query->tt_data * sizeof(struct tt_change);
628 /* Ensure we have all the claimed data */
629 if (unlikely(skb_headlen(skb) <
630 sizeof(struct tt_query_packet) + tt_len))
633 handle_tt_response(bat_priv, tt_query);
635 bat_dbg(DBG_TT, bat_priv,
636 "Routing TT_RESPONSE to %pM [%c]\n",
638 (tt_query->flags & TT_FULL_TABLE ? 'F' : '.'));
639 tt_query->tt_data = htons(tt_query->tt_data);
640 return route_unicast_packet(skb, recv_if);
646 /* returning NET_RX_DROP will make the caller function kfree the skb */
650 int recv_roam_adv(struct sk_buff *skb, struct hard_iface *recv_if)
652 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
653 struct roam_adv_packet *roam_adv_packet;
654 struct orig_node *orig_node;
655 struct ethhdr *ethhdr;
657 /* drop packet if it has not necessary minimum size */
658 if (unlikely(!pskb_may_pull(skb, sizeof(struct roam_adv_packet))))
661 ethhdr = (struct ethhdr *)skb_mac_header(skb);
663 /* packet with unicast indication but broadcast recipient */
664 if (is_broadcast_ether_addr(ethhdr->h_dest))
667 /* packet with broadcast sender address */
668 if (is_broadcast_ether_addr(ethhdr->h_source))
671 roam_adv_packet = (struct roam_adv_packet *)skb->data;
673 if (!is_my_mac(roam_adv_packet->dst))
674 return route_unicast_packet(skb, recv_if);
676 orig_node = orig_hash_find(bat_priv, roam_adv_packet->src);
680 bat_dbg(DBG_TT, bat_priv, "Received ROAMING_ADV from %pM "
681 "(client %pM)\n", roam_adv_packet->src,
682 roam_adv_packet->client);
684 tt_global_add(bat_priv, orig_node, roam_adv_packet->client,
685 atomic_read(&orig_node->last_ttvn) + 1, true, false);
687 /* Roaming phase starts: I have new information but the ttvn has not
688 * been incremented yet. This flag will make me check all the incoming
689 * packets for the correct destination. */
690 bat_priv->tt_poss_change = true;
692 orig_node_free_ref(orig_node);
694 /* returning NET_RX_DROP will make the caller function kfree the skb */
698 /* find a suitable router for this originator, and use
699 * bonding if possible. increases the found neighbors
701 struct neigh_node *find_router(struct bat_priv *bat_priv,
702 struct orig_node *orig_node,
703 const struct hard_iface *recv_if)
705 struct orig_node *primary_orig_node;
706 struct orig_node *router_orig;
707 struct neigh_node *router;
708 static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
714 router = orig_node_get_router(orig_node);
718 /* without bonding, the first node should
719 * always choose the default router. */
720 bonding_enabled = atomic_read(&bat_priv->bonding);
723 /* select default router to output */
724 router_orig = router->orig_node;
728 if ((!recv_if) && (!bonding_enabled))
731 /* if we have something in the primary_addr, we can search
732 * for a potential bonding candidate. */
733 if (compare_eth(router_orig->primary_addr, zero_mac))
736 /* find the orig_node which has the primary interface. might
737 * even be the same as our router_orig in many cases */
739 if (compare_eth(router_orig->primary_addr, router_orig->orig)) {
740 primary_orig_node = router_orig;
742 primary_orig_node = orig_hash_find(bat_priv,
743 router_orig->primary_addr);
744 if (!primary_orig_node)
747 orig_node_free_ref(primary_orig_node);
750 /* with less than 2 candidates, we can't do any
751 * bonding and prefer the original router. */
752 if (atomic_read(&primary_orig_node->bond_candidates) < 2)
755 /* all nodes between should choose a candidate which
756 * is is not on the interface where the packet came
759 neigh_node_free_ref(router);
762 router = find_bond_router(primary_orig_node, recv_if);
764 router = find_ifalter_router(primary_orig_node, recv_if);
767 if (router && router->if_incoming->if_status != IF_ACTIVE)
776 neigh_node_free_ref(router);
780 static int check_unicast_packet(struct sk_buff *skb, int hdr_size)
782 struct ethhdr *ethhdr;
784 /* drop packet if it has not necessary minimum size */
785 if (unlikely(!pskb_may_pull(skb, hdr_size)))
788 ethhdr = (struct ethhdr *)skb_mac_header(skb);
790 /* packet with unicast indication but broadcast recipient */
791 if (is_broadcast_ether_addr(ethhdr->h_dest))
794 /* packet with broadcast sender address */
795 if (is_broadcast_ether_addr(ethhdr->h_source))
799 if (!is_my_mac(ethhdr->h_dest))
805 int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
807 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
808 struct orig_node *orig_node = NULL;
809 struct neigh_node *neigh_node = NULL;
810 struct unicast_packet *unicast_packet;
811 struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb);
812 int ret = NET_RX_DROP;
813 struct sk_buff *new_skb;
815 unicast_packet = (struct unicast_packet *)skb->data;
818 if (unicast_packet->ttl < 2) {
819 pr_debug("Warning - can't forward unicast packet from %pM to "
820 "%pM: ttl exceeded\n", ethhdr->h_source,
821 unicast_packet->dest);
825 /* get routing information */
826 orig_node = orig_hash_find(bat_priv, unicast_packet->dest);
831 /* find_router() increases neigh_nodes refcount if found. */
832 neigh_node = find_router(bat_priv, orig_node, recv_if);
837 /* create a copy of the skb, if needed, to modify it. */
838 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
841 unicast_packet = (struct unicast_packet *)skb->data;
843 if (unicast_packet->packet_type == BAT_UNICAST &&
844 atomic_read(&bat_priv->fragmentation) &&
845 skb->len > neigh_node->if_incoming->net_dev->mtu) {
846 ret = frag_send_skb(skb, bat_priv,
847 neigh_node->if_incoming, neigh_node->addr);
851 if (unicast_packet->packet_type == BAT_UNICAST_FRAG &&
852 frag_can_reassemble(skb, neigh_node->if_incoming->net_dev->mtu)) {
854 ret = frag_reassemble_skb(skb, bat_priv, &new_skb);
856 if (ret == NET_RX_DROP)
859 /* packet was buffered for late merge */
861 ret = NET_RX_SUCCESS;
866 unicast_packet = (struct unicast_packet *)skb->data;
870 unicast_packet->ttl--;
873 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
874 ret = NET_RX_SUCCESS;
878 neigh_node_free_ref(neigh_node);
880 orig_node_free_ref(orig_node);
884 static int check_unicast_ttvn(struct bat_priv *bat_priv,
885 struct sk_buff *skb) {
887 struct orig_node *orig_node;
888 struct ethhdr *ethhdr;
889 struct hard_iface *primary_if;
890 struct unicast_packet *unicast_packet;
893 /* I could need to modify it */
894 if (skb_cow(skb, sizeof(struct unicast_packet)) < 0)
897 unicast_packet = (struct unicast_packet *)skb->data;
899 if (is_my_mac(unicast_packet->dest)) {
900 tt_poss_change = bat_priv->tt_poss_change;
901 curr_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
903 orig_node = orig_hash_find(bat_priv, unicast_packet->dest);
908 curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
909 tt_poss_change = orig_node->tt_poss_change;
910 orig_node_free_ref(orig_node);
913 /* Check whether I have to reroute the packet */
914 if (seq_before(unicast_packet->ttvn, curr_ttvn) || tt_poss_change) {
915 /* Linearize the skb before accessing it */
916 if (skb_linearize(skb) < 0)
919 ethhdr = (struct ethhdr *)(skb->data +
920 sizeof(struct unicast_packet));
921 orig_node = transtable_search(bat_priv, NULL, ethhdr->h_dest);
924 if (!is_my_client(bat_priv, ethhdr->h_dest))
926 primary_if = primary_if_get_selected(bat_priv);
929 memcpy(unicast_packet->dest,
930 primary_if->net_dev->dev_addr, ETH_ALEN);
931 hardif_free_ref(primary_if);
933 memcpy(unicast_packet->dest, orig_node->orig,
935 curr_ttvn = (uint8_t)
936 atomic_read(&orig_node->last_ttvn);
937 orig_node_free_ref(orig_node);
940 bat_dbg(DBG_ROUTES, bat_priv, "TTVN mismatch (old_ttvn %u "
941 "new_ttvn %u)! Rerouting unicast packet (for %pM) to "
942 "%pM\n", unicast_packet->ttvn, curr_ttvn,
943 ethhdr->h_dest, unicast_packet->dest);
945 unicast_packet->ttvn = curr_ttvn;
950 int recv_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
952 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
953 struct unicast_packet *unicast_packet;
954 int hdr_size = sizeof(*unicast_packet);
956 if (check_unicast_packet(skb, hdr_size) < 0)
959 if (!check_unicast_ttvn(bat_priv, skb))
962 unicast_packet = (struct unicast_packet *)skb->data;
965 if (is_my_mac(unicast_packet->dest)) {
966 interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size);
967 return NET_RX_SUCCESS;
970 return route_unicast_packet(skb, recv_if);
973 int recv_ucast_frag_packet(struct sk_buff *skb, struct hard_iface *recv_if)
975 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
976 struct unicast_frag_packet *unicast_packet;
977 int hdr_size = sizeof(*unicast_packet);
978 struct sk_buff *new_skb = NULL;
981 if (check_unicast_packet(skb, hdr_size) < 0)
984 if (!check_unicast_ttvn(bat_priv, skb))
987 unicast_packet = (struct unicast_frag_packet *)skb->data;
990 if (is_my_mac(unicast_packet->dest)) {
992 ret = frag_reassemble_skb(skb, bat_priv, &new_skb);
994 if (ret == NET_RX_DROP)
997 /* packet was buffered for late merge */
999 return NET_RX_SUCCESS;
1001 interface_rx(recv_if->soft_iface, new_skb, recv_if,
1002 sizeof(struct unicast_packet));
1003 return NET_RX_SUCCESS;
1006 return route_unicast_packet(skb, recv_if);
1010 int recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
1012 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1013 struct orig_node *orig_node = NULL;
1014 struct bcast_packet *bcast_packet;
1015 struct ethhdr *ethhdr;
1016 int hdr_size = sizeof(*bcast_packet);
1017 int ret = NET_RX_DROP;
1020 /* drop packet if it has not necessary minimum size */
1021 if (unlikely(!pskb_may_pull(skb, hdr_size)))
1024 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1026 /* packet with broadcast indication but unicast recipient */
1027 if (!is_broadcast_ether_addr(ethhdr->h_dest))
1030 /* packet with broadcast sender address */
1031 if (is_broadcast_ether_addr(ethhdr->h_source))
1034 /* ignore broadcasts sent by myself */
1035 if (is_my_mac(ethhdr->h_source))
1038 bcast_packet = (struct bcast_packet *)skb->data;
1040 /* ignore broadcasts originated by myself */
1041 if (is_my_mac(bcast_packet->orig))
1044 if (bcast_packet->ttl < 2)
1047 orig_node = orig_hash_find(bat_priv, bcast_packet->orig);
1052 spin_lock_bh(&orig_node->bcast_seqno_lock);
1054 /* check whether the packet is a duplicate */
1055 if (get_bit_status(orig_node->bcast_bits, orig_node->last_bcast_seqno,
1056 ntohl(bcast_packet->seqno)))
1059 seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno;
1061 /* check whether the packet is old and the host just restarted. */
1062 if (window_protected(bat_priv, seq_diff,
1063 &orig_node->bcast_seqno_reset))
1066 /* mark broadcast in flood history, update window position
1068 if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1))
1069 orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno);
1071 spin_unlock_bh(&orig_node->bcast_seqno_lock);
1073 /* rebroadcast packet */
1074 add_bcast_packet_to_list(bat_priv, skb, 1);
1076 /* broadcast for me */
1077 interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size);
1078 ret = NET_RX_SUCCESS;
1082 spin_unlock_bh(&orig_node->bcast_seqno_lock);
1085 orig_node_free_ref(orig_node);
1089 int recv_vis_packet(struct sk_buff *skb, struct hard_iface *recv_if)
1091 struct vis_packet *vis_packet;
1092 struct ethhdr *ethhdr;
1093 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1094 int hdr_size = sizeof(*vis_packet);
1096 /* keep skb linear */
1097 if (skb_linearize(skb) < 0)
1100 if (unlikely(!pskb_may_pull(skb, hdr_size)))
1103 vis_packet = (struct vis_packet *)skb->data;
1104 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1107 if (!is_my_mac(ethhdr->h_dest))
1110 /* ignore own packets */
1111 if (is_my_mac(vis_packet->vis_orig))
1114 if (is_my_mac(vis_packet->sender_orig))
1117 switch (vis_packet->vis_type) {
1118 case VIS_TYPE_SERVER_SYNC:
1119 receive_server_sync_packet(bat_priv, vis_packet,
1123 case VIS_TYPE_CLIENT_UPDATE:
1124 receive_client_update_packet(bat_priv, vis_packet,
1128 default: /* ignore unknown packet */
1132 /* We take a copy of the data in the packet, so we should
1133 always free the skbuf. */