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, see <http://www.gnu.org/licenses/>.
21 #include "soft-interface.h"
22 #include "hard-interface.h"
23 #include "icmp_socket.h"
24 #include "translation-table.h"
25 #include "originator.h"
26 #include "bridge_loop_avoidance.h"
27 #include "distributed-arp-table.h"
28 #include "network-coding.h"
29 #include "fragmentation.h"
31 #include <linux/if_vlan.h>
33 static int batadv_route_unicast_packet(struct sk_buff *skb,
34 struct batadv_hard_iface *recv_if);
36 static void _batadv_update_route(struct batadv_priv *bat_priv,
37 struct batadv_orig_node *orig_node,
38 struct batadv_neigh_node *neigh_node)
40 struct batadv_neigh_node *curr_router;
42 curr_router = batadv_orig_node_get_router(orig_node);
45 if ((curr_router) && (!neigh_node)) {
46 batadv_dbg(BATADV_DBG_ROUTES, bat_priv,
47 "Deleting route towards: %pM\n", orig_node->orig);
48 batadv_tt_global_del_orig(bat_priv, orig_node, -1,
49 "Deleted route towards originator");
52 } else if ((!curr_router) && (neigh_node)) {
53 batadv_dbg(BATADV_DBG_ROUTES, bat_priv,
54 "Adding route towards: %pM (via %pM)\n",
55 orig_node->orig, neigh_node->addr);
57 } else if (neigh_node && curr_router) {
58 batadv_dbg(BATADV_DBG_ROUTES, bat_priv,
59 "Changing route towards: %pM (now via %pM - was via %pM)\n",
60 orig_node->orig, neigh_node->addr,
65 batadv_neigh_node_free_ref(curr_router);
67 /* increase refcount of new best neighbor */
68 if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount))
71 spin_lock_bh(&orig_node->neigh_list_lock);
72 rcu_assign_pointer(orig_node->router, neigh_node);
73 spin_unlock_bh(&orig_node->neigh_list_lock);
75 /* decrease refcount of previous best neighbor */
77 batadv_neigh_node_free_ref(curr_router);
80 void batadv_update_route(struct batadv_priv *bat_priv,
81 struct batadv_orig_node *orig_node,
82 struct batadv_neigh_node *neigh_node)
84 struct batadv_neigh_node *router = NULL;
89 router = batadv_orig_node_get_router(orig_node);
91 if (router != neigh_node)
92 _batadv_update_route(bat_priv, orig_node, neigh_node);
96 batadv_neigh_node_free_ref(router);
99 /* caller must hold the neigh_list_lock */
100 void batadv_bonding_candidate_del(struct batadv_orig_node *orig_node,
101 struct batadv_neigh_node *neigh_node)
103 /* this neighbor is not part of our candidate list */
104 if (list_empty(&neigh_node->bonding_list))
107 list_del_rcu(&neigh_node->bonding_list);
108 INIT_LIST_HEAD(&neigh_node->bonding_list);
109 batadv_neigh_node_free_ref(neigh_node);
110 atomic_dec(&orig_node->bond_candidates);
117 * batadv_bonding_candidate_add - consider a new link for bonding mode towards
118 * the given originator
119 * @bat_priv: the bat priv with all the soft interface information
120 * @orig_node: the target node
121 * @neigh_node: the neighbor representing the new link to consider for bonding
124 void batadv_bonding_candidate_add(struct batadv_priv *bat_priv,
125 struct batadv_orig_node *orig_node,
126 struct batadv_neigh_node *neigh_node)
128 struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
129 struct batadv_neigh_node *tmp_neigh_node, *router = NULL;
130 uint8_t interference_candidate = 0;
132 spin_lock_bh(&orig_node->neigh_list_lock);
134 /* only consider if it has the same primary address ... */
135 if (!batadv_compare_eth(orig_node->orig,
136 neigh_node->orig_node->primary_addr))
139 router = batadv_orig_node_get_router(orig_node);
144 /* ... and is good enough to be considered */
145 if (bao->bat_neigh_is_equiv_or_better(neigh_node, router))
148 /* check if we have another candidate with the same mac address or
149 * interface. If we do, we won't select this candidate because of
150 * possible interference.
152 hlist_for_each_entry_rcu(tmp_neigh_node,
153 &orig_node->neigh_list, list) {
154 if (tmp_neigh_node == neigh_node)
157 /* we only care if the other candidate is even
158 * considered as candidate.
160 if (list_empty(&tmp_neigh_node->bonding_list))
163 if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) ||
164 (batadv_compare_eth(neigh_node->addr,
165 tmp_neigh_node->addr))) {
166 interference_candidate = 1;
171 /* don't care further if it is an interference candidate */
172 if (interference_candidate)
175 /* this neighbor already is part of our candidate list */
176 if (!list_empty(&neigh_node->bonding_list))
179 if (!atomic_inc_not_zero(&neigh_node->refcount))
182 list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list);
183 atomic_inc(&orig_node->bond_candidates);
187 batadv_bonding_candidate_del(orig_node, neigh_node);
190 spin_unlock_bh(&orig_node->neigh_list_lock);
193 batadv_neigh_node_free_ref(router);
196 /* copy primary address for bonding */
198 batadv_bonding_save_primary(const struct batadv_orig_node *orig_node,
199 struct batadv_orig_node *orig_neigh_node,
200 const struct batadv_ogm_packet *batman_ogm_packet)
202 if (!(batman_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP))
205 memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN);
208 /* checks whether the host restarted and is in the protection time.
210 * 0 if the packet is to be accepted
211 * 1 if the packet is to be ignored.
213 int batadv_window_protected(struct batadv_priv *bat_priv, int32_t seq_num_diff,
214 unsigned long *last_reset)
216 if (seq_num_diff <= -BATADV_TQ_LOCAL_WINDOW_SIZE ||
217 seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) {
218 if (!batadv_has_timed_out(*last_reset,
219 BATADV_RESET_PROTECTION_MS))
222 *last_reset = jiffies;
223 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
224 "old packet received, start protection\n");
230 bool batadv_check_management_packet(struct sk_buff *skb,
231 struct batadv_hard_iface *hard_iface,
234 struct ethhdr *ethhdr;
236 /* drop packet if it has not necessary minimum size */
237 if (unlikely(!pskb_may_pull(skb, header_len)))
240 ethhdr = eth_hdr(skb);
242 /* packet with broadcast indication but unicast recipient */
243 if (!is_broadcast_ether_addr(ethhdr->h_dest))
246 /* packet with broadcast sender address */
247 if (is_broadcast_ether_addr(ethhdr->h_source))
250 /* create a copy of the skb, if needed, to modify it. */
251 if (skb_cow(skb, 0) < 0)
254 /* keep skb linear */
255 if (skb_linearize(skb) < 0)
262 * batadv_recv_my_icmp_packet - receive an icmp packet locally
263 * @bat_priv: the bat priv with all the soft interface information
264 * @skb: icmp packet to process
266 * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
269 static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv,
272 struct batadv_hard_iface *primary_if = NULL;
273 struct batadv_orig_node *orig_node = NULL;
274 struct batadv_icmp_header *icmph;
275 int res, ret = NET_RX_DROP;
277 icmph = (struct batadv_icmp_header *)skb->data;
279 switch (icmph->msg_type) {
280 case BATADV_ECHO_REPLY:
281 case BATADV_DESTINATION_UNREACHABLE:
282 case BATADV_TTL_EXCEEDED:
283 /* receive the packet */
284 if (skb_linearize(skb) < 0)
287 batadv_socket_receive_packet(icmph, skb->len);
289 case BATADV_ECHO_REQUEST:
290 /* answer echo request (ping) */
291 primary_if = batadv_primary_if_get_selected(bat_priv);
295 /* get routing information */
296 orig_node = batadv_orig_hash_find(bat_priv, icmph->orig);
300 /* create a copy of the skb, if needed, to modify it. */
301 if (skb_cow(skb, ETH_HLEN) < 0)
304 icmph = (struct batadv_icmp_header *)skb->data;
306 memcpy(icmph->dst, icmph->orig, ETH_ALEN);
307 memcpy(icmph->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
308 icmph->msg_type = BATADV_ECHO_REPLY;
309 icmph->ttl = BATADV_TTL;
311 res = batadv_send_skb_to_orig(skb, orig_node, NULL);
312 if (res != NET_XMIT_DROP)
313 ret = NET_RX_SUCCESS;
317 /* drop unknown type */
322 batadv_hardif_free_ref(primary_if);
324 batadv_orig_node_free_ref(orig_node);
328 static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv,
331 struct batadv_hard_iface *primary_if = NULL;
332 struct batadv_orig_node *orig_node = NULL;
333 struct batadv_icmp_packet *icmp_packet;
334 int ret = NET_RX_DROP;
336 icmp_packet = (struct batadv_icmp_packet *)skb->data;
338 /* send TTL exceeded if packet is an echo request (traceroute) */
339 if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) {
340 pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n",
341 icmp_packet->orig, icmp_packet->dst);
345 primary_if = batadv_primary_if_get_selected(bat_priv);
349 /* get routing information */
350 orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig);
354 /* create a copy of the skb, if needed, to modify it. */
355 if (skb_cow(skb, ETH_HLEN) < 0)
358 icmp_packet = (struct batadv_icmp_packet *)skb->data;
360 memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
361 memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr,
363 icmp_packet->msg_type = BATADV_TTL_EXCEEDED;
364 icmp_packet->ttl = BATADV_TTL;
366 if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP)
367 ret = NET_RX_SUCCESS;
371 batadv_hardif_free_ref(primary_if);
373 batadv_orig_node_free_ref(orig_node);
378 int batadv_recv_icmp_packet(struct sk_buff *skb,
379 struct batadv_hard_iface *recv_if)
381 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
382 struct batadv_icmp_header *icmph;
383 struct batadv_icmp_packet_rr *icmp_packet_rr;
384 struct ethhdr *ethhdr;
385 struct batadv_orig_node *orig_node = NULL;
386 int hdr_size = sizeof(struct batadv_icmp_header);
387 int ret = NET_RX_DROP;
389 /* drop packet if it has not necessary minimum size */
390 if (unlikely(!pskb_may_pull(skb, hdr_size)))
393 ethhdr = eth_hdr(skb);
395 /* packet with unicast indication but broadcast recipient */
396 if (is_broadcast_ether_addr(ethhdr->h_dest))
399 /* packet with broadcast sender address */
400 if (is_broadcast_ether_addr(ethhdr->h_source))
404 if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest))
407 icmph = (struct batadv_icmp_header *)skb->data;
409 /* add record route information if not full */
410 if ((icmph->msg_type == BATADV_ECHO_REPLY ||
411 icmph->msg_type == BATADV_ECHO_REQUEST) &&
412 (skb->len >= sizeof(struct batadv_icmp_packet_rr))) {
413 if (skb_linearize(skb) < 0)
416 /* create a copy of the skb, if needed, to modify it. */
417 if (skb_cow(skb, ETH_HLEN) < 0)
420 icmph = (struct batadv_icmp_header *)skb->data;
421 icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmph;
422 if (icmp_packet_rr->rr_cur >= BATADV_RR_LEN)
425 memcpy(&(icmp_packet_rr->rr[icmp_packet_rr->rr_cur]),
426 ethhdr->h_dest, ETH_ALEN);
427 icmp_packet_rr->rr_cur++;
431 if (batadv_is_my_mac(bat_priv, icmph->dst))
432 return batadv_recv_my_icmp_packet(bat_priv, skb);
436 return batadv_recv_icmp_ttl_exceeded(bat_priv, skb);
438 /* get routing information */
439 orig_node = batadv_orig_hash_find(bat_priv, icmph->dst);
443 /* create a copy of the skb, if needed, to modify it. */
444 if (skb_cow(skb, ETH_HLEN) < 0)
447 icmph = (struct batadv_icmp_header *)skb->data;
453 if (batadv_send_skb_to_orig(skb, orig_node, recv_if) != NET_XMIT_DROP)
454 ret = NET_RX_SUCCESS;
458 batadv_orig_node_free_ref(orig_node);
462 /* In the bonding case, send the packets in a round
463 * robin fashion over the remaining interfaces.
465 * This method rotates the bonding list and increases the
466 * returned router's refcount.
468 static struct batadv_neigh_node *
469 batadv_find_bond_router(struct batadv_orig_node *primary_orig,
470 const struct batadv_hard_iface *recv_if)
472 struct batadv_neigh_node *tmp_neigh_node;
473 struct batadv_neigh_node *router = NULL, *first_candidate = NULL;
476 list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list,
478 if (!first_candidate)
479 first_candidate = tmp_neigh_node;
481 /* recv_if == NULL on the first node. */
482 if (tmp_neigh_node->if_incoming == recv_if)
485 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
488 router = tmp_neigh_node;
492 /* use the first candidate if nothing was found. */
493 if (!router && first_candidate &&
494 atomic_inc_not_zero(&first_candidate->refcount))
495 router = first_candidate;
500 /* selected should point to the next element
501 * after the current router
503 spin_lock_bh(&primary_orig->neigh_list_lock);
504 /* this is a list_move(), which unfortunately
505 * does not exist as rcu version
507 list_del_rcu(&primary_orig->bond_list);
508 list_add_rcu(&primary_orig->bond_list,
509 &router->bonding_list);
510 spin_unlock_bh(&primary_orig->neigh_list_lock);
518 * batadv_find_ifalter_router - find the best of the remaining candidates which
519 * are not using this interface
520 * @bat_priv: the bat priv with all the soft interface information
521 * @primary_orig: the destination
522 * @recv_if: the interface that the router returned by this function has to not
525 * Returns the best candidate towards primary_orig that is not using recv_if.
526 * Increases the returned neighbor's refcount
528 static struct batadv_neigh_node *
529 batadv_find_ifalter_router(struct batadv_priv *bat_priv,
530 struct batadv_orig_node *primary_orig,
531 const struct batadv_hard_iface *recv_if)
533 struct batadv_neigh_node *router = NULL, *first_candidate = NULL;
534 struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
535 struct batadv_neigh_node *tmp_neigh_node;
538 list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list,
540 if (!first_candidate)
541 first_candidate = tmp_neigh_node;
543 /* recv_if == NULL on the first node. */
544 if (tmp_neigh_node->if_incoming == recv_if)
547 if (router && bao->bat_neigh_cmp(tmp_neigh_node, router))
550 if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
553 /* decrement refcount of previously selected router */
555 batadv_neigh_node_free_ref(router);
557 /* we found a better router (or at least one valid router) */
558 router = tmp_neigh_node;
561 /* use the first candidate if nothing was found. */
562 if (!router && first_candidate &&
563 atomic_inc_not_zero(&first_candidate->refcount))
564 router = first_candidate;
571 * batadv_check_unicast_packet - Check for malformed unicast packets
572 * @bat_priv: the bat priv with all the soft interface information
573 * @skb: packet to check
574 * @hdr_size: size of header to pull
576 * Check for short header and bad addresses in given packet. Returns negative
577 * value when check fails and 0 otherwise. The negative value depends on the
578 * reason: -ENODATA for bad header, -EBADR for broadcast destination or source,
579 * and -EREMOTE for non-local (other host) destination.
581 static int batadv_check_unicast_packet(struct batadv_priv *bat_priv,
582 struct sk_buff *skb, int hdr_size)
584 struct ethhdr *ethhdr;
586 /* drop packet if it has not necessary minimum size */
587 if (unlikely(!pskb_may_pull(skb, hdr_size)))
590 ethhdr = eth_hdr(skb);
592 /* packet with unicast indication but broadcast recipient */
593 if (is_broadcast_ether_addr(ethhdr->h_dest))
596 /* packet with broadcast sender address */
597 if (is_broadcast_ether_addr(ethhdr->h_source))
601 if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest))
607 /* find a suitable router for this originator, and use
608 * bonding if possible. increases the found neighbors
611 struct batadv_neigh_node *
612 batadv_find_router(struct batadv_priv *bat_priv,
613 struct batadv_orig_node *orig_node,
614 const struct batadv_hard_iface *recv_if)
616 struct batadv_orig_node *primary_orig_node;
617 struct batadv_orig_node *router_orig;
618 struct batadv_neigh_node *router;
619 static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
621 uint8_t *primary_addr;
626 router = batadv_orig_node_get_router(orig_node);
630 /* without bonding, the first node should
631 * always choose the default router.
633 bonding_enabled = atomic_read(&bat_priv->bonding);
636 /* select default router to output */
637 router_orig = router->orig_node;
641 if ((!recv_if) && (!bonding_enabled))
644 primary_addr = router_orig->primary_addr;
646 /* if we have something in the primary_addr, we can search
647 * for a potential bonding candidate.
649 if (batadv_compare_eth(primary_addr, zero_mac))
652 /* find the orig_node which has the primary interface. might
653 * even be the same as our router_orig in many cases
655 if (batadv_compare_eth(primary_addr, router_orig->orig)) {
656 primary_orig_node = router_orig;
658 primary_orig_node = batadv_orig_hash_find(bat_priv,
660 if (!primary_orig_node)
663 batadv_orig_node_free_ref(primary_orig_node);
666 /* with less than 2 candidates, we can't do any
667 * bonding and prefer the original router.
669 if (atomic_read(&primary_orig_node->bond_candidates) < 2)
672 /* all nodes between should choose a candidate which
673 * is is not on the interface where the packet came
676 batadv_neigh_node_free_ref(router);
679 router = batadv_find_bond_router(primary_orig_node, recv_if);
681 router = batadv_find_ifalter_router(bat_priv, primary_orig_node,
685 if (router && router->if_incoming->if_status != BATADV_IF_ACTIVE)
694 batadv_neigh_node_free_ref(router);
698 static int batadv_route_unicast_packet(struct sk_buff *skb,
699 struct batadv_hard_iface *recv_if)
701 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
702 struct batadv_orig_node *orig_node = NULL;
703 struct batadv_unicast_packet *unicast_packet;
704 struct ethhdr *ethhdr = eth_hdr(skb);
705 int res, hdr_len, ret = NET_RX_DROP;
707 unicast_packet = (struct batadv_unicast_packet *)skb->data;
710 if (unicast_packet->ttl < 2) {
711 pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n",
712 ethhdr->h_source, unicast_packet->dest);
716 /* get routing information */
717 orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest);
722 /* create a copy of the skb, if needed, to modify it. */
723 if (skb_cow(skb, ETH_HLEN) < 0)
727 unicast_packet = (struct batadv_unicast_packet *)skb->data;
728 unicast_packet->ttl--;
730 switch (unicast_packet->packet_type) {
731 case BATADV_UNICAST_4ADDR:
732 hdr_len = sizeof(struct batadv_unicast_4addr_packet);
735 hdr_len = sizeof(struct batadv_unicast_packet);
738 /* other packet types not supported - yet */
744 batadv_skb_set_priority(skb, hdr_len);
746 res = batadv_send_skb_to_orig(skb, orig_node, recv_if);
748 /* translate transmit result into receive result */
749 if (res == NET_XMIT_SUCCESS) {
750 /* skb was transmitted and consumed */
751 batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD);
752 batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES,
753 skb->len + ETH_HLEN);
755 ret = NET_RX_SUCCESS;
756 } else if (res == NET_XMIT_POLICED) {
757 /* skb was buffered and consumed */
758 ret = NET_RX_SUCCESS;
763 batadv_orig_node_free_ref(orig_node);
768 * batadv_reroute_unicast_packet - update the unicast header for re-routing
769 * @bat_priv: the bat priv with all the soft interface information
770 * @unicast_packet: the unicast header to be updated
771 * @dst_addr: the payload destination
772 * @vid: VLAN identifier
774 * Search the translation table for dst_addr and update the unicast header with
775 * the new corresponding information (originator address where the destination
776 * client currently is and its known TTVN)
778 * Returns true if the packet header has been updated, false otherwise
781 batadv_reroute_unicast_packet(struct batadv_priv *bat_priv,
782 struct batadv_unicast_packet *unicast_packet,
783 uint8_t *dst_addr, unsigned short vid)
785 struct batadv_orig_node *orig_node = NULL;
786 struct batadv_hard_iface *primary_if = NULL;
788 uint8_t *orig_addr, orig_ttvn;
790 if (batadv_is_my_client(bat_priv, dst_addr, vid)) {
791 primary_if = batadv_primary_if_get_selected(bat_priv);
794 orig_addr = primary_if->net_dev->dev_addr;
795 orig_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
797 orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr,
802 if (batadv_compare_eth(orig_node->orig, unicast_packet->dest))
805 orig_addr = orig_node->orig;
806 orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
809 /* update the packet header */
810 memcpy(unicast_packet->dest, orig_addr, ETH_ALEN);
811 unicast_packet->ttvn = orig_ttvn;
816 batadv_hardif_free_ref(primary_if);
818 batadv_orig_node_free_ref(orig_node);
823 static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv,
824 struct sk_buff *skb, int hdr_len) {
825 struct batadv_unicast_packet *unicast_packet;
826 struct batadv_hard_iface *primary_if;
827 struct batadv_orig_node *orig_node;
828 uint8_t curr_ttvn, old_ttvn;
829 struct ethhdr *ethhdr;
833 /* check if there is enough data before accessing it */
834 if (pskb_may_pull(skb, hdr_len + ETH_HLEN) < 0)
837 /* create a copy of the skb (in case of for re-routing) to modify it. */
838 if (skb_cow(skb, sizeof(*unicast_packet)) < 0)
841 unicast_packet = (struct batadv_unicast_packet *)skb->data;
842 vid = batadv_get_vid(skb, hdr_len);
843 ethhdr = (struct ethhdr *)(skb->data + hdr_len);
845 /* check if the destination client was served by this node and it is now
846 * roaming. In this case, it means that the node has got a ROAM_ADV
847 * message and that it knows the new destination in the mesh to re-route
850 if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) {
851 if (batadv_reroute_unicast_packet(bat_priv, unicast_packet,
852 ethhdr->h_dest, vid))
853 net_ratelimited_function(batadv_dbg, BATADV_DBG_TT,
855 "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n",
856 unicast_packet->dest,
858 /* at this point the mesh destination should have been
859 * substituted with the originator address found in the global
860 * table. If not, let the packet go untouched anyway because
861 * there is nothing the node can do
866 /* retrieve the TTVN known by this node for the packet destination. This
867 * value is used later to check if the node which sent (or re-routed
868 * last time) the packet had an updated information or not
870 curr_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
871 if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) {
872 orig_node = batadv_orig_hash_find(bat_priv,
873 unicast_packet->dest);
874 /* if it is not possible to find the orig_node representing the
875 * destination, the packet can immediately be dropped as it will
876 * not be possible to deliver it
881 curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
882 batadv_orig_node_free_ref(orig_node);
885 /* check if the TTVN contained in the packet is fresher than what the
888 is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn);
892 old_ttvn = unicast_packet->ttvn;
893 /* the packet was forged based on outdated network information. Its
894 * destination can possibly be updated and forwarded towards the new
897 if (batadv_reroute_unicast_packet(bat_priv, unicast_packet,
898 ethhdr->h_dest, vid)) {
899 net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, bat_priv,
900 "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n",
901 unicast_packet->dest, ethhdr->h_dest,
902 old_ttvn, curr_ttvn);
906 /* the packet has not been re-routed: either the destination is
907 * currently served by this node or there is no destination at all and
908 * it is possible to drop the packet
910 if (!batadv_is_my_client(bat_priv, ethhdr->h_dest, vid))
913 /* update the header in order to let the packet be delivered to this
914 * node's soft interface
916 primary_if = batadv_primary_if_get_selected(bat_priv);
920 memcpy(unicast_packet->dest, primary_if->net_dev->dev_addr, ETH_ALEN);
922 batadv_hardif_free_ref(primary_if);
924 unicast_packet->ttvn = curr_ttvn;
930 * batadv_recv_unhandled_unicast_packet - receive and process packets which
931 * are in the unicast number space but not yet known to the implementation
932 * @skb: unicast tvlv packet to process
933 * @recv_if: pointer to interface this packet was received on
935 * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
938 int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb,
939 struct batadv_hard_iface *recv_if)
941 struct batadv_unicast_packet *unicast_packet;
942 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
943 int check, hdr_size = sizeof(*unicast_packet);
945 check = batadv_check_unicast_packet(bat_priv, skb, hdr_size);
949 /* we don't know about this type, drop it. */
950 unicast_packet = (struct batadv_unicast_packet *)skb->data;
951 if (batadv_is_my_mac(bat_priv, unicast_packet->dest))
954 return batadv_route_unicast_packet(skb, recv_if);
957 int batadv_recv_unicast_packet(struct sk_buff *skb,
958 struct batadv_hard_iface *recv_if)
960 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
961 struct batadv_unicast_packet *unicast_packet;
962 struct batadv_unicast_4addr_packet *unicast_4addr_packet;
964 struct batadv_orig_node *orig_node = NULL;
965 int check, hdr_size = sizeof(*unicast_packet);
968 unicast_packet = (struct batadv_unicast_packet *)skb->data;
969 unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
971 is4addr = unicast_packet->packet_type == BATADV_UNICAST_4ADDR;
972 /* the caller function should have already pulled 2 bytes */
974 hdr_size = sizeof(*unicast_4addr_packet);
976 /* function returns -EREMOTE for promiscuous packets */
977 check = batadv_check_unicast_packet(bat_priv, skb, hdr_size);
979 /* Even though the packet is not for us, we might save it to use for
980 * decoding a later received coded packet
982 if (check == -EREMOTE)
983 batadv_nc_skb_store_sniffed_unicast(bat_priv, skb);
987 if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size))
991 if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) {
993 batadv_dat_inc_counter(bat_priv,
994 unicast_4addr_packet->subtype);
995 orig_addr = unicast_4addr_packet->src;
996 orig_node = batadv_orig_hash_find(bat_priv, orig_addr);
999 if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb,
1002 if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb,
1006 batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size,
1011 batadv_orig_node_free_ref(orig_node);
1013 return NET_RX_SUCCESS;
1016 return batadv_route_unicast_packet(skb, recv_if);
1020 * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets
1021 * @skb: unicast tvlv packet to process
1022 * @recv_if: pointer to interface this packet was received on
1023 * @dst_addr: the payload destination
1025 * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
1028 int batadv_recv_unicast_tvlv(struct sk_buff *skb,
1029 struct batadv_hard_iface *recv_if)
1031 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1032 struct batadv_unicast_tvlv_packet *unicast_tvlv_packet;
1033 unsigned char *tvlv_buff;
1034 uint16_t tvlv_buff_len;
1035 int hdr_size = sizeof(*unicast_tvlv_packet);
1036 int ret = NET_RX_DROP;
1038 if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0)
1041 /* the header is likely to be modified while forwarding */
1042 if (skb_cow(skb, hdr_size) < 0)
1045 /* packet needs to be linearized to access the tvlv content */
1046 if (skb_linearize(skb) < 0)
1049 unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)skb->data;
1051 tvlv_buff = (unsigned char *)(skb->data + hdr_size);
1052 tvlv_buff_len = ntohs(unicast_tvlv_packet->tvlv_len);
1054 if (tvlv_buff_len > skb->len - hdr_size)
1057 ret = batadv_tvlv_containers_process(bat_priv, false, NULL,
1058 unicast_tvlv_packet->src,
1059 unicast_tvlv_packet->dst,
1060 tvlv_buff, tvlv_buff_len);
1062 if (ret != NET_RX_SUCCESS)
1063 ret = batadv_route_unicast_packet(skb, recv_if);
1069 * batadv_recv_frag_packet - process received fragment
1070 * @skb: the received fragment
1071 * @recv_if: interface that the skb is received on
1073 * This function does one of the three following things: 1) Forward fragment, if
1074 * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till
1075 * lack further fragments; 3) Merge fragments, if we have all needed parts.
1077 * Return NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise.
1079 int batadv_recv_frag_packet(struct sk_buff *skb,
1080 struct batadv_hard_iface *recv_if)
1082 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1083 struct batadv_orig_node *orig_node_src = NULL;
1084 struct batadv_frag_packet *frag_packet;
1085 int ret = NET_RX_DROP;
1087 if (batadv_check_unicast_packet(bat_priv, skb,
1088 sizeof(*frag_packet)) < 0)
1091 frag_packet = (struct batadv_frag_packet *)skb->data;
1092 orig_node_src = batadv_orig_hash_find(bat_priv, frag_packet->orig);
1096 /* Route the fragment if it is not for us and too big to be merged. */
1097 if (!batadv_is_my_mac(bat_priv, frag_packet->dest) &&
1098 batadv_frag_skb_fwd(skb, recv_if, orig_node_src)) {
1099 ret = NET_RX_SUCCESS;
1103 batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_RX);
1104 batadv_add_counter(bat_priv, BATADV_CNT_FRAG_RX_BYTES, skb->len);
1106 /* Add fragment to buffer and merge if possible. */
1107 if (!batadv_frag_skb_buffer(&skb, orig_node_src))
1110 /* Deliver merged packet to the appropriate handler, if it was
1114 batadv_batman_skb_recv(skb, recv_if->net_dev,
1115 &recv_if->batman_adv_ptype, NULL);
1117 ret = NET_RX_SUCCESS;
1121 batadv_orig_node_free_ref(orig_node_src);
1126 int batadv_recv_bcast_packet(struct sk_buff *skb,
1127 struct batadv_hard_iface *recv_if)
1129 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1130 struct batadv_orig_node *orig_node = NULL;
1131 struct batadv_bcast_packet *bcast_packet;
1132 struct ethhdr *ethhdr;
1133 int hdr_size = sizeof(*bcast_packet);
1134 int ret = NET_RX_DROP;
1138 /* drop packet if it has not necessary minimum size */
1139 if (unlikely(!pskb_may_pull(skb, hdr_size)))
1142 ethhdr = eth_hdr(skb);
1144 /* packet with broadcast indication but unicast recipient */
1145 if (!is_broadcast_ether_addr(ethhdr->h_dest))
1148 /* packet with broadcast sender address */
1149 if (is_broadcast_ether_addr(ethhdr->h_source))
1152 /* ignore broadcasts sent by myself */
1153 if (batadv_is_my_mac(bat_priv, ethhdr->h_source))
1156 bcast_packet = (struct batadv_bcast_packet *)skb->data;
1158 /* ignore broadcasts originated by myself */
1159 if (batadv_is_my_mac(bat_priv, bcast_packet->orig))
1162 if (bcast_packet->ttl < 2)
1165 orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig);
1170 spin_lock_bh(&orig_node->bcast_seqno_lock);
1172 seqno = ntohl(bcast_packet->seqno);
1173 /* check whether the packet is a duplicate */
1174 if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno,
1178 seq_diff = seqno - orig_node->last_bcast_seqno;
1180 /* check whether the packet is old and the host just restarted. */
1181 if (batadv_window_protected(bat_priv, seq_diff,
1182 &orig_node->bcast_seqno_reset))
1185 /* mark broadcast in flood history, update window position
1188 if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1))
1189 orig_node->last_bcast_seqno = seqno;
1191 spin_unlock_bh(&orig_node->bcast_seqno_lock);
1193 /* check whether this has been sent by another originator before */
1194 if (batadv_bla_check_bcast_duplist(bat_priv, skb))
1197 batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet));
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);