2 * Copyright (C) 2007-2012 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"
33 void slide_own_bcast_window(struct hard_iface *hard_iface)
35 struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
36 struct hashtable_t *hash = bat_priv->orig_hash;
37 struct hlist_node *node;
38 struct hlist_head *head;
39 struct orig_node *orig_node;
44 for (i = 0; i < hash->size; i++) {
45 head = &hash->table[i];
48 hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
49 spin_lock_bh(&orig_node->ogm_cnt_lock);
50 word_index = hard_iface->if_num * NUM_WORDS;
51 word = &(orig_node->bcast_own[word_index]);
53 bit_get_packet(bat_priv, word, 1, 0);
54 orig_node->bcast_own_sum[hard_iface->if_num] =
55 bit_packet_count(word);
56 spin_unlock_bh(&orig_node->ogm_cnt_lock);
62 static void _update_route(struct bat_priv *bat_priv,
63 struct orig_node *orig_node,
64 struct neigh_node *neigh_node)
66 struct neigh_node *curr_router;
68 curr_router = orig_node_get_router(orig_node);
71 if ((curr_router) && (!neigh_node)) {
72 bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n",
74 tt_global_del_orig(bat_priv, orig_node,
75 "Deleted route towards originator");
78 } else if ((!curr_router) && (neigh_node)) {
80 bat_dbg(DBG_ROUTES, bat_priv,
81 "Adding route towards: %pM (via %pM)\n",
82 orig_node->orig, neigh_node->addr);
84 } else if (neigh_node && curr_router) {
85 bat_dbg(DBG_ROUTES, bat_priv,
86 "Changing route towards: %pM (now via %pM - was via %pM)\n",
87 orig_node->orig, neigh_node->addr,
92 neigh_node_free_ref(curr_router);
94 /* increase refcount of new best neighbor */
95 if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount))
98 spin_lock_bh(&orig_node->neigh_list_lock);
99 rcu_assign_pointer(orig_node->router, neigh_node);
100 spin_unlock_bh(&orig_node->neigh_list_lock);
102 /* decrease refcount of previous best neighbor */
104 neigh_node_free_ref(curr_router);
107 void update_route(struct bat_priv *bat_priv, struct orig_node *orig_node,
108 struct neigh_node *neigh_node)
110 struct neigh_node *router = NULL;
115 router = orig_node_get_router(orig_node);
117 if (router != neigh_node)
118 _update_route(bat_priv, orig_node, neigh_node);
122 neigh_node_free_ref(router);
125 /* caller must hold the neigh_list_lock */
126 void bonding_candidate_del(struct orig_node *orig_node,
127 struct neigh_node *neigh_node)
129 /* this neighbor is not part of our candidate list */
130 if (list_empty(&neigh_node->bonding_list))
133 list_del_rcu(&neigh_node->bonding_list);
134 INIT_LIST_HEAD(&neigh_node->bonding_list);
135 neigh_node_free_ref(neigh_node);
136 atomic_dec(&orig_node->bond_candidates);
142 void bonding_candidate_add(struct orig_node *orig_node,
143 struct neigh_node *neigh_node)
145 struct hlist_node *node;
146 struct neigh_node *tmp_neigh_node, *router = NULL;
147 uint8_t interference_candidate = 0;
149 spin_lock_bh(&orig_node->neigh_list_lock);
151 /* only consider if it has the same primary address ... */
152 if (!compare_eth(orig_node->orig,
153 neigh_node->orig_node->primary_addr))
156 router = orig_node_get_router(orig_node);
160 /* ... and is good enough to be considered */
161 if (neigh_node->tq_avg < router->tq_avg - BONDING_TQ_THRESHOLD)
165 * check if we have another candidate with the same mac address or
166 * interface. If we do, we won't select this candidate because of
167 * possible interference.
169 hlist_for_each_entry_rcu(tmp_neigh_node, node,
170 &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. */
177 if (list_empty(&tmp_neigh_node->bonding_list))
180 if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) ||
181 (compare_eth(neigh_node->addr, tmp_neigh_node->addr))) {
182 interference_candidate = 1;
187 /* don't care further if it is an interference candidate */
188 if (interference_candidate)
191 /* this neighbor already is part of our candidate list */
192 if (!list_empty(&neigh_node->bonding_list))
195 if (!atomic_inc_not_zero(&neigh_node->refcount))
198 list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list);
199 atomic_inc(&orig_node->bond_candidates);
203 bonding_candidate_del(orig_node, neigh_node);
206 spin_unlock_bh(&orig_node->neigh_list_lock);
209 neigh_node_free_ref(router);
212 /* copy primary address for bonding */
213 void bonding_save_primary(const struct orig_node *orig_node,
214 struct orig_node *orig_neigh_node,
215 const struct batman_ogm_packet *batman_ogm_packet)
217 if (!(batman_ogm_packet->flags & PRIMARIES_FIRST_HOP))
220 memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN);
223 /* checks whether the host restarted and is in the protection time.
225 * 0 if the packet is to be accepted
226 * 1 if the packet is to be ignored.
228 int window_protected(struct bat_priv *bat_priv, int32_t seq_num_diff,
229 unsigned long *last_reset)
231 if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE) ||
232 (seq_num_diff >= EXPECTED_SEQNO_RANGE)) {
233 if (has_timed_out(*last_reset, RESET_PROTECTION_MS)) {
235 *last_reset = jiffies;
236 bat_dbg(DBG_BATMAN, bat_priv,
237 "old packet received, start protection\n");
247 int recv_bat_ogm_packet(struct sk_buff *skb, struct hard_iface *hard_iface)
249 struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
250 struct ethhdr *ethhdr;
252 /* drop packet if it has not necessary minimum size */
253 if (unlikely(!pskb_may_pull(skb, BATMAN_OGM_LEN)))
256 ethhdr = (struct ethhdr *)skb_mac_header(skb);
258 /* packet with broadcast indication but unicast recipient */
259 if (!is_broadcast_ether_addr(ethhdr->h_dest))
262 /* packet with broadcast sender address */
263 if (is_broadcast_ether_addr(ethhdr->h_source))
266 /* create a copy of the skb, if needed, to modify it. */
267 if (skb_cow(skb, 0) < 0)
270 /* keep skb linear */
271 if (skb_linearize(skb) < 0)
274 bat_priv->bat_algo_ops->bat_ogm_receive(hard_iface, skb);
277 return NET_RX_SUCCESS;
280 static int recv_my_icmp_packet(struct bat_priv *bat_priv,
281 struct sk_buff *skb, size_t icmp_len)
283 struct hard_iface *primary_if = NULL;
284 struct orig_node *orig_node = NULL;
285 struct neigh_node *router = NULL;
286 struct icmp_packet_rr *icmp_packet;
287 int ret = NET_RX_DROP;
289 icmp_packet = (struct icmp_packet_rr *)skb->data;
291 /* add data to device queue */
292 if (icmp_packet->msg_type != ECHO_REQUEST) {
293 bat_socket_receive_packet(icmp_packet, icmp_len);
297 primary_if = primary_if_get_selected(bat_priv);
301 /* answer echo request (ping) */
302 /* get routing information */
303 orig_node = orig_hash_find(bat_priv, icmp_packet->orig);
307 router = orig_node_get_router(orig_node);
311 /* create a copy of the skb, if needed, to modify it. */
312 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
315 icmp_packet = (struct icmp_packet_rr *)skb->data;
317 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
318 memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
319 icmp_packet->msg_type = ECHO_REPLY;
320 icmp_packet->header.ttl = TTL;
322 send_skb_packet(skb, router->if_incoming, router->addr);
323 ret = NET_RX_SUCCESS;
327 hardif_free_ref(primary_if);
329 neigh_node_free_ref(router);
331 orig_node_free_ref(orig_node);
335 static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv,
338 struct hard_iface *primary_if = NULL;
339 struct orig_node *orig_node = NULL;
340 struct neigh_node *router = NULL;
341 struct icmp_packet *icmp_packet;
342 int ret = NET_RX_DROP;
344 icmp_packet = (struct icmp_packet *)skb->data;
346 /* send TTL exceeded if packet is an echo request (traceroute) */
347 if (icmp_packet->msg_type != ECHO_REQUEST) {
348 pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n",
349 icmp_packet->orig, icmp_packet->dst);
353 primary_if = primary_if_get_selected(bat_priv);
357 /* get routing information */
358 orig_node = orig_hash_find(bat_priv, icmp_packet->orig);
362 router = orig_node_get_router(orig_node);
366 /* create a copy of the skb, if needed, to modify it. */
367 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
370 icmp_packet = (struct icmp_packet *)skb->data;
372 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
373 memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
374 icmp_packet->msg_type = TTL_EXCEEDED;
375 icmp_packet->header.ttl = TTL;
377 send_skb_packet(skb, router->if_incoming, router->addr);
378 ret = NET_RX_SUCCESS;
382 hardif_free_ref(primary_if);
384 neigh_node_free_ref(router);
386 orig_node_free_ref(orig_node);
391 int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if)
393 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
394 struct icmp_packet_rr *icmp_packet;
395 struct ethhdr *ethhdr;
396 struct orig_node *orig_node = NULL;
397 struct neigh_node *router = NULL;
398 int hdr_size = sizeof(struct icmp_packet);
399 int ret = NET_RX_DROP;
402 * we truncate all incoming icmp packets if they don't match our size
404 if (skb->len >= sizeof(struct icmp_packet_rr))
405 hdr_size = sizeof(struct icmp_packet_rr);
407 /* drop packet if it has not necessary minimum size */
408 if (unlikely(!pskb_may_pull(skb, hdr_size)))
411 ethhdr = (struct ethhdr *)skb_mac_header(skb);
413 /* packet with unicast indication but broadcast recipient */
414 if (is_broadcast_ether_addr(ethhdr->h_dest))
417 /* packet with broadcast sender address */
418 if (is_broadcast_ether_addr(ethhdr->h_source))
422 if (!is_my_mac(ethhdr->h_dest))
425 icmp_packet = (struct icmp_packet_rr *)skb->data;
427 /* add record route information if not full */
428 if ((hdr_size == sizeof(struct icmp_packet_rr)) &&
429 (icmp_packet->rr_cur < BAT_RR_LEN)) {
430 memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]),
431 ethhdr->h_dest, ETH_ALEN);
432 icmp_packet->rr_cur++;
436 if (is_my_mac(icmp_packet->dst))
437 return recv_my_icmp_packet(bat_priv, skb, hdr_size);
440 if (icmp_packet->header.ttl < 2)
441 return recv_icmp_ttl_exceeded(bat_priv, skb);
443 /* get routing information */
444 orig_node = orig_hash_find(bat_priv, icmp_packet->dst);
448 router = orig_node_get_router(orig_node);
452 /* create a copy of the skb, if needed, to modify it. */
453 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
456 icmp_packet = (struct icmp_packet_rr *)skb->data;
459 icmp_packet->header.ttl--;
462 send_skb_packet(skb, router->if_incoming, router->addr);
463 ret = NET_RX_SUCCESS;
467 neigh_node_free_ref(router);
469 orig_node_free_ref(orig_node);
473 /* In the bonding case, send the packets in a round
474 * robin fashion over the remaining interfaces.
476 * This method rotates the bonding list and increases the
477 * returned router's refcount. */
478 static struct neigh_node *find_bond_router(struct orig_node *primary_orig,
479 const struct hard_iface *recv_if)
481 struct neigh_node *tmp_neigh_node;
482 struct neigh_node *router = NULL, *first_candidate = NULL;
485 list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list,
487 if (!first_candidate)
488 first_candidate = tmp_neigh_node;
490 /* recv_if == NULL on the first node. */
491 if (tmp_neigh_node->if_incoming == recv_if)
494 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
497 router = tmp_neigh_node;
501 /* use the first candidate if nothing was found. */
502 if (!router && first_candidate &&
503 atomic_inc_not_zero(&first_candidate->refcount))
504 router = first_candidate;
509 /* selected should point to the next element
510 * after the current router */
511 spin_lock_bh(&primary_orig->neigh_list_lock);
512 /* this is a list_move(), which unfortunately
513 * does not exist as rcu version */
514 list_del_rcu(&primary_orig->bond_list);
515 list_add_rcu(&primary_orig->bond_list,
516 &router->bonding_list);
517 spin_unlock_bh(&primary_orig->neigh_list_lock);
524 /* Interface Alternating: Use the best of the
525 * remaining candidates which are not using
528 * Increases the returned router's refcount */
529 static struct neigh_node *find_ifalter_router(struct orig_node *primary_orig,
530 const struct hard_iface *recv_if)
532 struct neigh_node *tmp_neigh_node;
533 struct neigh_node *router = NULL, *first_candidate = NULL;
536 list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list,
538 if (!first_candidate)
539 first_candidate = tmp_neigh_node;
541 /* recv_if == NULL on the first node. */
542 if (tmp_neigh_node->if_incoming == recv_if)
545 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
548 /* if we don't have a router yet
549 * or this one is better, choose it. */
551 (tmp_neigh_node->tq_avg > router->tq_avg)) {
552 /* decrement refcount of
553 * previously selected router */
555 neigh_node_free_ref(router);
557 router = tmp_neigh_node;
558 atomic_inc_not_zero(&router->refcount);
561 neigh_node_free_ref(tmp_neigh_node);
564 /* use the first candidate if nothing was found. */
565 if (!router && first_candidate &&
566 atomic_inc_not_zero(&first_candidate->refcount))
567 router = first_candidate;
573 int recv_tt_query(struct sk_buff *skb, struct hard_iface *recv_if)
575 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
576 struct tt_query_packet *tt_query;
578 struct ethhdr *ethhdr;
580 /* drop packet if it has not necessary minimum size */
581 if (unlikely(!pskb_may_pull(skb, sizeof(struct tt_query_packet))))
584 /* I could need to modify it */
585 if (skb_cow(skb, sizeof(struct tt_query_packet)) < 0)
588 ethhdr = (struct ethhdr *)skb_mac_header(skb);
590 /* packet with unicast indication but broadcast recipient */
591 if (is_broadcast_ether_addr(ethhdr->h_dest))
594 /* packet with broadcast sender address */
595 if (is_broadcast_ether_addr(ethhdr->h_source))
598 tt_query = (struct tt_query_packet *)skb->data;
600 tt_query->tt_data = ntohs(tt_query->tt_data);
602 switch (tt_query->flags & TT_QUERY_TYPE_MASK) {
604 /* If we cannot provide an answer the tt_request is
606 if (!send_tt_response(bat_priv, tt_query)) {
607 bat_dbg(DBG_TT, bat_priv,
608 "Routing TT_REQUEST to %pM [%c]\n",
610 (tt_query->flags & TT_FULL_TABLE ? 'F' : '.'));
611 tt_query->tt_data = htons(tt_query->tt_data);
612 return route_unicast_packet(skb, recv_if);
616 if (is_my_mac(tt_query->dst)) {
617 /* packet needs to be linearized to access the TT
619 if (skb_linearize(skb) < 0)
622 tt_len = tt_query->tt_data * sizeof(struct tt_change);
624 /* Ensure we have all the claimed data */
625 if (unlikely(skb_headlen(skb) <
626 sizeof(struct tt_query_packet) + tt_len))
629 handle_tt_response(bat_priv, tt_query);
631 bat_dbg(DBG_TT, bat_priv,
632 "Routing TT_RESPONSE to %pM [%c]\n",
634 (tt_query->flags & TT_FULL_TABLE ? 'F' : '.'));
635 tt_query->tt_data = htons(tt_query->tt_data);
636 return route_unicast_packet(skb, recv_if);
642 /* returning NET_RX_DROP will make the caller function kfree the skb */
646 int recv_roam_adv(struct sk_buff *skb, struct hard_iface *recv_if)
648 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
649 struct roam_adv_packet *roam_adv_packet;
650 struct orig_node *orig_node;
651 struct ethhdr *ethhdr;
653 /* drop packet if it has not necessary minimum size */
654 if (unlikely(!pskb_may_pull(skb, sizeof(struct roam_adv_packet))))
657 ethhdr = (struct ethhdr *)skb_mac_header(skb);
659 /* packet with unicast indication but broadcast recipient */
660 if (is_broadcast_ether_addr(ethhdr->h_dest))
663 /* packet with broadcast sender address */
664 if (is_broadcast_ether_addr(ethhdr->h_source))
667 roam_adv_packet = (struct roam_adv_packet *)skb->data;
669 if (!is_my_mac(roam_adv_packet->dst))
670 return route_unicast_packet(skb, recv_if);
672 orig_node = orig_hash_find(bat_priv, roam_adv_packet->src);
676 bat_dbg(DBG_TT, bat_priv,
677 "Received ROAMING_ADV from %pM (client %pM)\n",
678 roam_adv_packet->src, roam_adv_packet->client);
680 tt_global_add(bat_priv, orig_node, roam_adv_packet->client,
681 atomic_read(&orig_node->last_ttvn) + 1, true, false);
683 /* Roaming phase starts: I have new information but the ttvn has not
684 * been incremented yet. This flag will make me check all the incoming
685 * packets for the correct destination. */
686 bat_priv->tt_poss_change = true;
688 orig_node_free_ref(orig_node);
690 /* returning NET_RX_DROP will make the caller function kfree the skb */
694 /* find a suitable router for this originator, and use
695 * bonding if possible. increases the found neighbors
697 struct neigh_node *find_router(struct bat_priv *bat_priv,
698 struct orig_node *orig_node,
699 const struct hard_iface *recv_if)
701 struct orig_node *primary_orig_node;
702 struct orig_node *router_orig;
703 struct neigh_node *router;
704 static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
710 router = orig_node_get_router(orig_node);
714 /* without bonding, the first node should
715 * always choose the default router. */
716 bonding_enabled = atomic_read(&bat_priv->bonding);
719 /* select default router to output */
720 router_orig = router->orig_node;
724 if ((!recv_if) && (!bonding_enabled))
727 /* if we have something in the primary_addr, we can search
728 * for a potential bonding candidate. */
729 if (compare_eth(router_orig->primary_addr, zero_mac))
732 /* find the orig_node which has the primary interface. might
733 * even be the same as our router_orig in many cases */
735 if (compare_eth(router_orig->primary_addr, router_orig->orig)) {
736 primary_orig_node = router_orig;
738 primary_orig_node = orig_hash_find(bat_priv,
739 router_orig->primary_addr);
740 if (!primary_orig_node)
743 orig_node_free_ref(primary_orig_node);
746 /* with less than 2 candidates, we can't do any
747 * bonding and prefer the original router. */
748 if (atomic_read(&primary_orig_node->bond_candidates) < 2)
751 /* all nodes between should choose a candidate which
752 * is is not on the interface where the packet came
755 neigh_node_free_ref(router);
758 router = find_bond_router(primary_orig_node, recv_if);
760 router = find_ifalter_router(primary_orig_node, recv_if);
763 if (router && router->if_incoming->if_status != IF_ACTIVE)
772 neigh_node_free_ref(router);
776 static int check_unicast_packet(struct sk_buff *skb, int hdr_size)
778 struct ethhdr *ethhdr;
780 /* drop packet if it has not necessary minimum size */
781 if (unlikely(!pskb_may_pull(skb, hdr_size)))
784 ethhdr = (struct ethhdr *)skb_mac_header(skb);
786 /* packet with unicast indication but broadcast recipient */
787 if (is_broadcast_ether_addr(ethhdr->h_dest))
790 /* packet with broadcast sender address */
791 if (is_broadcast_ether_addr(ethhdr->h_source))
795 if (!is_my_mac(ethhdr->h_dest))
801 int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
803 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
804 struct orig_node *orig_node = NULL;
805 struct neigh_node *neigh_node = NULL;
806 struct unicast_packet *unicast_packet;
807 struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb);
808 int ret = NET_RX_DROP;
809 struct sk_buff *new_skb;
811 unicast_packet = (struct unicast_packet *)skb->data;
814 if (unicast_packet->header.ttl < 2) {
815 pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n",
816 ethhdr->h_source, unicast_packet->dest);
820 /* get routing information */
821 orig_node = orig_hash_find(bat_priv, unicast_packet->dest);
826 /* find_router() increases neigh_nodes refcount if found. */
827 neigh_node = find_router(bat_priv, orig_node, recv_if);
832 /* create a copy of the skb, if needed, to modify it. */
833 if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
836 unicast_packet = (struct unicast_packet *)skb->data;
838 if (unicast_packet->header.packet_type == BAT_UNICAST &&
839 atomic_read(&bat_priv->fragmentation) &&
840 skb->len > neigh_node->if_incoming->net_dev->mtu) {
841 ret = frag_send_skb(skb, bat_priv,
842 neigh_node->if_incoming, neigh_node->addr);
846 if (unicast_packet->header.packet_type == BAT_UNICAST_FRAG &&
847 frag_can_reassemble(skb, neigh_node->if_incoming->net_dev->mtu)) {
849 ret = frag_reassemble_skb(skb, bat_priv, &new_skb);
851 if (ret == NET_RX_DROP)
854 /* packet was buffered for late merge */
856 ret = NET_RX_SUCCESS;
861 unicast_packet = (struct unicast_packet *)skb->data;
865 unicast_packet->header.ttl--;
868 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
869 ret = NET_RX_SUCCESS;
873 neigh_node_free_ref(neigh_node);
875 orig_node_free_ref(orig_node);
879 static int check_unicast_ttvn(struct bat_priv *bat_priv,
880 struct sk_buff *skb) {
882 struct orig_node *orig_node;
883 struct ethhdr *ethhdr;
884 struct hard_iface *primary_if;
885 struct unicast_packet *unicast_packet;
888 /* I could need to modify it */
889 if (skb_cow(skb, sizeof(struct unicast_packet)) < 0)
892 unicast_packet = (struct unicast_packet *)skb->data;
894 if (is_my_mac(unicast_packet->dest)) {
895 tt_poss_change = bat_priv->tt_poss_change;
896 curr_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
898 orig_node = orig_hash_find(bat_priv, unicast_packet->dest);
903 curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
904 tt_poss_change = orig_node->tt_poss_change;
905 orig_node_free_ref(orig_node);
908 /* Check whether I have to reroute the packet */
909 if (seq_before(unicast_packet->ttvn, curr_ttvn) || tt_poss_change) {
910 /* Linearize the skb before accessing it */
911 if (skb_linearize(skb) < 0)
914 ethhdr = (struct ethhdr *)(skb->data +
915 sizeof(struct unicast_packet));
916 orig_node = transtable_search(bat_priv, NULL, ethhdr->h_dest);
919 if (!is_my_client(bat_priv, ethhdr->h_dest))
921 primary_if = primary_if_get_selected(bat_priv);
924 memcpy(unicast_packet->dest,
925 primary_if->net_dev->dev_addr, ETH_ALEN);
926 hardif_free_ref(primary_if);
928 memcpy(unicast_packet->dest, orig_node->orig,
930 curr_ttvn = (uint8_t)
931 atomic_read(&orig_node->last_ttvn);
932 orig_node_free_ref(orig_node);
935 bat_dbg(DBG_ROUTES, bat_priv,
936 "TTVN mismatch (old_ttvn %u new_ttvn %u)! Rerouting unicast packet (for %pM) to %pM\n",
937 unicast_packet->ttvn, curr_ttvn, ethhdr->h_dest,
938 unicast_packet->dest);
940 unicast_packet->ttvn = curr_ttvn;
945 int recv_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
947 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
948 struct unicast_packet *unicast_packet;
949 int hdr_size = sizeof(*unicast_packet);
951 if (check_unicast_packet(skb, hdr_size) < 0)
954 if (!check_unicast_ttvn(bat_priv, skb))
957 unicast_packet = (struct unicast_packet *)skb->data;
960 if (is_my_mac(unicast_packet->dest)) {
961 interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size);
962 return NET_RX_SUCCESS;
965 return route_unicast_packet(skb, recv_if);
968 int recv_ucast_frag_packet(struct sk_buff *skb, struct hard_iface *recv_if)
970 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
971 struct unicast_frag_packet *unicast_packet;
972 int hdr_size = sizeof(*unicast_packet);
973 struct sk_buff *new_skb = NULL;
976 if (check_unicast_packet(skb, hdr_size) < 0)
979 if (!check_unicast_ttvn(bat_priv, skb))
982 unicast_packet = (struct unicast_frag_packet *)skb->data;
985 if (is_my_mac(unicast_packet->dest)) {
987 ret = frag_reassemble_skb(skb, bat_priv, &new_skb);
989 if (ret == NET_RX_DROP)
992 /* packet was buffered for late merge */
994 return NET_RX_SUCCESS;
996 interface_rx(recv_if->soft_iface, new_skb, recv_if,
997 sizeof(struct unicast_packet));
998 return NET_RX_SUCCESS;
1001 return route_unicast_packet(skb, recv_if);
1005 int recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
1007 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1008 struct orig_node *orig_node = NULL;
1009 struct bcast_packet *bcast_packet;
1010 struct ethhdr *ethhdr;
1011 int hdr_size = sizeof(*bcast_packet);
1012 int ret = NET_RX_DROP;
1015 /* drop packet if it has not necessary minimum size */
1016 if (unlikely(!pskb_may_pull(skb, hdr_size)))
1019 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1021 /* packet with broadcast indication but unicast recipient */
1022 if (!is_broadcast_ether_addr(ethhdr->h_dest))
1025 /* packet with broadcast sender address */
1026 if (is_broadcast_ether_addr(ethhdr->h_source))
1029 /* ignore broadcasts sent by myself */
1030 if (is_my_mac(ethhdr->h_source))
1033 bcast_packet = (struct bcast_packet *)skb->data;
1035 /* ignore broadcasts originated by myself */
1036 if (is_my_mac(bcast_packet->orig))
1039 if (bcast_packet->header.ttl < 2)
1042 orig_node = orig_hash_find(bat_priv, bcast_packet->orig);
1047 spin_lock_bh(&orig_node->bcast_seqno_lock);
1049 /* check whether the packet is a duplicate */
1050 if (get_bit_status(orig_node->bcast_bits, orig_node->last_bcast_seqno,
1051 ntohl(bcast_packet->seqno)))
1054 seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno;
1056 /* check whether the packet is old and the host just restarted. */
1057 if (window_protected(bat_priv, seq_diff,
1058 &orig_node->bcast_seqno_reset))
1061 /* mark broadcast in flood history, update window position
1063 if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1))
1064 orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno);
1066 spin_unlock_bh(&orig_node->bcast_seqno_lock);
1068 /* rebroadcast packet */
1069 add_bcast_packet_to_list(bat_priv, skb, 1);
1071 /* broadcast for me */
1072 interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size);
1073 ret = NET_RX_SUCCESS;
1077 spin_unlock_bh(&orig_node->bcast_seqno_lock);
1080 orig_node_free_ref(orig_node);
1084 int recv_vis_packet(struct sk_buff *skb, struct hard_iface *recv_if)
1086 struct vis_packet *vis_packet;
1087 struct ethhdr *ethhdr;
1088 struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1089 int hdr_size = sizeof(*vis_packet);
1091 /* keep skb linear */
1092 if (skb_linearize(skb) < 0)
1095 if (unlikely(!pskb_may_pull(skb, hdr_size)))
1098 vis_packet = (struct vis_packet *)skb->data;
1099 ethhdr = (struct ethhdr *)skb_mac_header(skb);
1102 if (!is_my_mac(ethhdr->h_dest))
1105 /* ignore own packets */
1106 if (is_my_mac(vis_packet->vis_orig))
1109 if (is_my_mac(vis_packet->sender_orig))
1112 switch (vis_packet->vis_type) {
1113 case VIS_TYPE_SERVER_SYNC:
1114 receive_server_sync_packet(bat_priv, vis_packet,
1118 case VIS_TYPE_CLIENT_UPDATE:
1119 receive_client_update_packet(bat_priv, vis_packet,
1123 default: /* ignore unknown packet */
1127 /* We take a copy of the data in the packet, so we should
1128 always free the skbuf. */