1 /* Copyright (C) 2007-2014 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);
37 * _batadv_update_route - set the router for this originator
38 * @bat_priv: the bat priv with all the soft interface information
39 * @orig_node: orig node which is to be configured
40 * @recv_if: the receive interface for which this route is set
41 * @neigh_node: neighbor which should be the next router
43 * This function does not perform any error checks
45 static void _batadv_update_route(struct batadv_priv *bat_priv,
46 struct batadv_orig_node *orig_node,
47 struct batadv_hard_iface *recv_if,
48 struct batadv_neigh_node *neigh_node)
50 struct batadv_orig_ifinfo *orig_ifinfo;
51 struct batadv_neigh_node *curr_router;
53 orig_ifinfo = batadv_orig_ifinfo_get(orig_node, recv_if);
58 curr_router = rcu_dereference(orig_ifinfo->router);
59 if (curr_router && !atomic_inc_not_zero(&curr_router->refcount))
64 if ((curr_router) && (!neigh_node)) {
65 batadv_dbg(BATADV_DBG_ROUTES, bat_priv,
66 "Deleting route towards: %pM\n", orig_node->orig);
67 batadv_tt_global_del_orig(bat_priv, orig_node, -1,
68 "Deleted route towards originator");
71 } else if ((!curr_router) && (neigh_node)) {
72 batadv_dbg(BATADV_DBG_ROUTES, bat_priv,
73 "Adding route towards: %pM (via %pM)\n",
74 orig_node->orig, neigh_node->addr);
76 } else if (neigh_node && curr_router) {
77 batadv_dbg(BATADV_DBG_ROUTES, bat_priv,
78 "Changing route towards: %pM (now via %pM - was via %pM)\n",
79 orig_node->orig, neigh_node->addr,
84 batadv_neigh_node_free_ref(curr_router);
86 /* increase refcount of new best neighbor */
87 if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount))
90 spin_lock_bh(&orig_node->neigh_list_lock);
91 rcu_assign_pointer(orig_ifinfo->router, neigh_node);
92 spin_unlock_bh(&orig_node->neigh_list_lock);
93 batadv_orig_ifinfo_free_ref(orig_ifinfo);
95 /* decrease refcount of previous best neighbor */
97 batadv_neigh_node_free_ref(curr_router);
101 * batadv_update_route - set the router for this originator
102 * @bat_priv: the bat priv with all the soft interface information
103 * @orig_node: orig node which is to be configured
104 * @recv_if: the receive interface for which this route is set
105 * @neigh_node: neighbor which should be the next router
107 void batadv_update_route(struct batadv_priv *bat_priv,
108 struct batadv_orig_node *orig_node,
109 struct batadv_hard_iface *recv_if,
110 struct batadv_neigh_node *neigh_node)
112 struct batadv_neigh_node *router = NULL;
117 router = batadv_orig_router_get(orig_node, recv_if);
119 if (router != neigh_node)
120 _batadv_update_route(bat_priv, orig_node, recv_if, neigh_node);
124 batadv_neigh_node_free_ref(router);
127 /* checks whether the host restarted and is in the protection time.
129 * 0 if the packet is to be accepted
130 * 1 if the packet is to be ignored.
132 int batadv_window_protected(struct batadv_priv *bat_priv, int32_t seq_num_diff,
133 unsigned long *last_reset)
135 if (seq_num_diff <= -BATADV_TQ_LOCAL_WINDOW_SIZE ||
136 seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) {
137 if (!batadv_has_timed_out(*last_reset,
138 BATADV_RESET_PROTECTION_MS))
141 *last_reset = jiffies;
142 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
143 "old packet received, start protection\n");
149 bool batadv_check_management_packet(struct sk_buff *skb,
150 struct batadv_hard_iface *hard_iface,
153 struct ethhdr *ethhdr;
155 /* drop packet if it has not necessary minimum size */
156 if (unlikely(!pskb_may_pull(skb, header_len)))
159 ethhdr = eth_hdr(skb);
161 /* packet with broadcast indication but unicast recipient */
162 if (!is_broadcast_ether_addr(ethhdr->h_dest))
165 /* packet with broadcast sender address */
166 if (is_broadcast_ether_addr(ethhdr->h_source))
169 /* create a copy of the skb, if needed, to modify it. */
170 if (skb_cow(skb, 0) < 0)
173 /* keep skb linear */
174 if (skb_linearize(skb) < 0)
181 * batadv_recv_my_icmp_packet - receive an icmp packet locally
182 * @bat_priv: the bat priv with all the soft interface information
183 * @skb: icmp packet to process
185 * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
188 static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv,
191 struct batadv_hard_iface *primary_if = NULL;
192 struct batadv_orig_node *orig_node = NULL;
193 struct batadv_icmp_header *icmph;
194 int res, ret = NET_RX_DROP;
196 icmph = (struct batadv_icmp_header *)skb->data;
198 switch (icmph->msg_type) {
199 case BATADV_ECHO_REPLY:
200 case BATADV_DESTINATION_UNREACHABLE:
201 case BATADV_TTL_EXCEEDED:
202 /* receive the packet */
203 if (skb_linearize(skb) < 0)
206 batadv_socket_receive_packet(icmph, skb->len);
208 case BATADV_ECHO_REQUEST:
209 /* answer echo request (ping) */
210 primary_if = batadv_primary_if_get_selected(bat_priv);
214 /* get routing information */
215 orig_node = batadv_orig_hash_find(bat_priv, icmph->orig);
219 /* create a copy of the skb, if needed, to modify it. */
220 if (skb_cow(skb, ETH_HLEN) < 0)
223 icmph = (struct batadv_icmp_header *)skb->data;
225 ether_addr_copy(icmph->dst, icmph->orig);
226 ether_addr_copy(icmph->orig, primary_if->net_dev->dev_addr);
227 icmph->msg_type = BATADV_ECHO_REPLY;
228 icmph->ttl = BATADV_TTL;
230 res = batadv_send_skb_to_orig(skb, orig_node, NULL);
231 if (res != NET_XMIT_DROP)
232 ret = NET_RX_SUCCESS;
236 /* drop unknown type */
241 batadv_hardif_free_ref(primary_if);
243 batadv_orig_node_free_ref(orig_node);
247 static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv,
250 struct batadv_hard_iface *primary_if = NULL;
251 struct batadv_orig_node *orig_node = NULL;
252 struct batadv_icmp_packet *icmp_packet;
253 int ret = NET_RX_DROP;
255 icmp_packet = (struct batadv_icmp_packet *)skb->data;
257 /* send TTL exceeded if packet is an echo request (traceroute) */
258 if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) {
259 pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n",
260 icmp_packet->orig, icmp_packet->dst);
264 primary_if = batadv_primary_if_get_selected(bat_priv);
268 /* get routing information */
269 orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig);
273 /* create a copy of the skb, if needed, to modify it. */
274 if (skb_cow(skb, ETH_HLEN) < 0)
277 icmp_packet = (struct batadv_icmp_packet *)skb->data;
279 ether_addr_copy(icmp_packet->dst, icmp_packet->orig);
280 ether_addr_copy(icmp_packet->orig, primary_if->net_dev->dev_addr);
281 icmp_packet->msg_type = BATADV_TTL_EXCEEDED;
282 icmp_packet->ttl = BATADV_TTL;
284 if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP)
285 ret = NET_RX_SUCCESS;
289 batadv_hardif_free_ref(primary_if);
291 batadv_orig_node_free_ref(orig_node);
296 int batadv_recv_icmp_packet(struct sk_buff *skb,
297 struct batadv_hard_iface *recv_if)
299 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
300 struct batadv_icmp_header *icmph;
301 struct batadv_icmp_packet_rr *icmp_packet_rr;
302 struct ethhdr *ethhdr;
303 struct batadv_orig_node *orig_node = NULL;
304 int hdr_size = sizeof(struct batadv_icmp_header);
305 int ret = NET_RX_DROP;
307 /* drop packet if it has not necessary minimum size */
308 if (unlikely(!pskb_may_pull(skb, hdr_size)))
311 ethhdr = eth_hdr(skb);
313 /* packet with unicast indication but broadcast recipient */
314 if (is_broadcast_ether_addr(ethhdr->h_dest))
317 /* packet with broadcast sender address */
318 if (is_broadcast_ether_addr(ethhdr->h_source))
322 if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest))
325 icmph = (struct batadv_icmp_header *)skb->data;
327 /* add record route information if not full */
328 if ((icmph->msg_type == BATADV_ECHO_REPLY ||
329 icmph->msg_type == BATADV_ECHO_REQUEST) &&
330 (skb->len >= sizeof(struct batadv_icmp_packet_rr))) {
331 if (skb_linearize(skb) < 0)
334 /* create a copy of the skb, if needed, to modify it. */
335 if (skb_cow(skb, ETH_HLEN) < 0)
338 icmph = (struct batadv_icmp_header *)skb->data;
339 icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmph;
340 if (icmp_packet_rr->rr_cur >= BATADV_RR_LEN)
343 ether_addr_copy(icmp_packet_rr->rr[icmp_packet_rr->rr_cur],
345 icmp_packet_rr->rr_cur++;
349 if (batadv_is_my_mac(bat_priv, icmph->dst))
350 return batadv_recv_my_icmp_packet(bat_priv, skb);
354 return batadv_recv_icmp_ttl_exceeded(bat_priv, skb);
356 /* get routing information */
357 orig_node = batadv_orig_hash_find(bat_priv, icmph->dst);
361 /* create a copy of the skb, if needed, to modify it. */
362 if (skb_cow(skb, ETH_HLEN) < 0)
365 icmph = (struct batadv_icmp_header *)skb->data;
371 if (batadv_send_skb_to_orig(skb, orig_node, recv_if) != NET_XMIT_DROP)
372 ret = NET_RX_SUCCESS;
376 batadv_orig_node_free_ref(orig_node);
381 * batadv_check_unicast_packet - Check for malformed unicast packets
382 * @bat_priv: the bat priv with all the soft interface information
383 * @skb: packet to check
384 * @hdr_size: size of header to pull
386 * Check for short header and bad addresses in given packet. Returns negative
387 * value when check fails and 0 otherwise. The negative value depends on the
388 * reason: -ENODATA for bad header, -EBADR for broadcast destination or source,
389 * and -EREMOTE for non-local (other host) destination.
391 static int batadv_check_unicast_packet(struct batadv_priv *bat_priv,
392 struct sk_buff *skb, int hdr_size)
394 struct ethhdr *ethhdr;
396 /* drop packet if it has not necessary minimum size */
397 if (unlikely(!pskb_may_pull(skb, hdr_size)))
400 ethhdr = eth_hdr(skb);
402 /* packet with unicast indication but broadcast recipient */
403 if (is_broadcast_ether_addr(ethhdr->h_dest))
406 /* packet with broadcast sender address */
407 if (is_broadcast_ether_addr(ethhdr->h_source))
411 if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest))
418 * batadv_find_router - find a suitable router for this originator
419 * @bat_priv: the bat priv with all the soft interface information
420 * @orig_node: the destination node
421 * @recv_if: pointer to interface this packet was received on
423 * Returns the router which should be used for this orig_node on
424 * this interface, or NULL if not available.
426 struct batadv_neigh_node *
427 batadv_find_router(struct batadv_priv *bat_priv,
428 struct batadv_orig_node *orig_node,
429 struct batadv_hard_iface *recv_if)
431 struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
432 struct batadv_neigh_node *first_candidate_router = NULL;
433 struct batadv_neigh_node *next_candidate_router = NULL;
434 struct batadv_neigh_node *router, *cand_router = NULL;
435 struct batadv_neigh_node *last_cand_router = NULL;
436 struct batadv_orig_ifinfo *cand, *first_candidate = NULL;
437 struct batadv_orig_ifinfo *next_candidate = NULL;
438 struct batadv_orig_ifinfo *last_candidate;
439 bool last_candidate_found = false;
444 router = batadv_orig_router_get(orig_node, recv_if);
446 /* only consider bonding for recv_if == BATADV_IF_DEFAULT (first hop)
449 if (recv_if == BATADV_IF_DEFAULT || !atomic_read(&bat_priv->bonding) ||
453 /* bonding: loop through the list of possible routers found
454 * for the various outgoing interfaces and find a candidate after
455 * the last chosen bonding candidate (next_candidate). If no such
456 * router is found, use the first candidate found (the previously
457 * chosen bonding candidate might have been the last one in the list).
458 * If this can't be found either, return the previously choosen
459 * router - obviously there are no other candidates.
462 last_candidate = orig_node->last_bonding_candidate;
464 last_cand_router = rcu_dereference(last_candidate->router);
466 hlist_for_each_entry_rcu(cand, &orig_node->ifinfo_list, list) {
467 /* acquire some structures and references ... */
468 if (!atomic_inc_not_zero(&cand->refcount))
471 cand_router = rcu_dereference(cand->router);
475 if (!atomic_inc_not_zero(&cand_router->refcount)) {
480 /* alternative candidate should be good enough to be
483 if (!bao->bat_neigh_is_equiv_or_better(cand_router,
488 /* don't use the same router twice */
489 if (last_cand_router == cand_router)
492 /* mark the first possible candidate */
493 if (!first_candidate) {
494 atomic_inc(&cand_router->refcount);
495 atomic_inc(&cand->refcount);
496 first_candidate = cand;
497 first_candidate_router = cand_router;
500 /* check if the loop has already passed the previously selected
501 * candidate ... this function should select the next candidate
502 * AFTER the previously used bonding candidate.
504 if (!last_candidate || last_candidate_found) {
505 next_candidate = cand;
506 next_candidate_router = cand_router;
510 if (last_candidate == cand)
511 last_candidate_found = true;
513 /* free references */
515 batadv_neigh_node_free_ref(cand_router);
518 batadv_orig_ifinfo_free_ref(cand);
522 /* last_bonding_candidate is reset below, remove the old reference. */
523 if (orig_node->last_bonding_candidate)
524 batadv_orig_ifinfo_free_ref(orig_node->last_bonding_candidate);
526 /* After finding candidates, handle the three cases:
527 * 1) there is a next candidate, use that
528 * 2) there is no next candidate, use the first of the list
529 * 3) there is no candidate at all, return the default router
531 if (next_candidate) {
532 batadv_neigh_node_free_ref(router);
534 /* remove references to first candidate, we don't need it. */
535 if (first_candidate) {
536 batadv_neigh_node_free_ref(first_candidate_router);
537 batadv_orig_ifinfo_free_ref(first_candidate);
539 router = next_candidate_router;
540 orig_node->last_bonding_candidate = next_candidate;
541 } else if (first_candidate) {
542 batadv_neigh_node_free_ref(router);
544 /* refcounting has already been done in the loop above. */
545 router = first_candidate_router;
546 orig_node->last_bonding_candidate = first_candidate;
548 orig_node->last_bonding_candidate = NULL;
554 static int batadv_route_unicast_packet(struct sk_buff *skb,
555 struct batadv_hard_iface *recv_if)
557 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
558 struct batadv_orig_node *orig_node = NULL;
559 struct batadv_unicast_packet *unicast_packet;
560 struct ethhdr *ethhdr = eth_hdr(skb);
561 int res, hdr_len, ret = NET_RX_DROP;
563 unicast_packet = (struct batadv_unicast_packet *)skb->data;
566 if (unicast_packet->ttl < 2) {
567 pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n",
568 ethhdr->h_source, unicast_packet->dest);
572 /* get routing information */
573 orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest);
578 /* create a copy of the skb, if needed, to modify it. */
579 if (skb_cow(skb, ETH_HLEN) < 0)
583 unicast_packet = (struct batadv_unicast_packet *)skb->data;
584 unicast_packet->ttl--;
586 switch (unicast_packet->packet_type) {
587 case BATADV_UNICAST_4ADDR:
588 hdr_len = sizeof(struct batadv_unicast_4addr_packet);
591 hdr_len = sizeof(struct batadv_unicast_packet);
594 /* other packet types not supported - yet */
600 batadv_skb_set_priority(skb, hdr_len);
602 res = batadv_send_skb_to_orig(skb, orig_node, recv_if);
604 /* translate transmit result into receive result */
605 if (res == NET_XMIT_SUCCESS) {
606 /* skb was transmitted and consumed */
607 batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD);
608 batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES,
609 skb->len + ETH_HLEN);
611 ret = NET_RX_SUCCESS;
612 } else if (res == NET_XMIT_POLICED) {
613 /* skb was buffered and consumed */
614 ret = NET_RX_SUCCESS;
619 batadv_orig_node_free_ref(orig_node);
624 * batadv_reroute_unicast_packet - update the unicast header for re-routing
625 * @bat_priv: the bat priv with all the soft interface information
626 * @unicast_packet: the unicast header to be updated
627 * @dst_addr: the payload destination
628 * @vid: VLAN identifier
630 * Search the translation table for dst_addr and update the unicast header with
631 * the new corresponding information (originator address where the destination
632 * client currently is and its known TTVN)
634 * Returns true if the packet header has been updated, false otherwise
637 batadv_reroute_unicast_packet(struct batadv_priv *bat_priv,
638 struct batadv_unicast_packet *unicast_packet,
639 uint8_t *dst_addr, unsigned short vid)
641 struct batadv_orig_node *orig_node = NULL;
642 struct batadv_hard_iface *primary_if = NULL;
644 uint8_t *orig_addr, orig_ttvn;
646 if (batadv_is_my_client(bat_priv, dst_addr, vid)) {
647 primary_if = batadv_primary_if_get_selected(bat_priv);
650 orig_addr = primary_if->net_dev->dev_addr;
651 orig_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
653 orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr,
658 if (batadv_compare_eth(orig_node->orig, unicast_packet->dest))
661 orig_addr = orig_node->orig;
662 orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
665 /* update the packet header */
666 ether_addr_copy(unicast_packet->dest, orig_addr);
667 unicast_packet->ttvn = orig_ttvn;
672 batadv_hardif_free_ref(primary_if);
674 batadv_orig_node_free_ref(orig_node);
679 static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv,
680 struct sk_buff *skb, int hdr_len) {
681 struct batadv_unicast_packet *unicast_packet;
682 struct batadv_hard_iface *primary_if;
683 struct batadv_orig_node *orig_node;
684 uint8_t curr_ttvn, old_ttvn;
685 struct ethhdr *ethhdr;
689 /* check if there is enough data before accessing it */
690 if (!pskb_may_pull(skb, hdr_len + ETH_HLEN))
693 /* create a copy of the skb (in case of for re-routing) to modify it. */
694 if (skb_cow(skb, sizeof(*unicast_packet)) < 0)
697 unicast_packet = (struct batadv_unicast_packet *)skb->data;
698 vid = batadv_get_vid(skb, hdr_len);
699 ethhdr = (struct ethhdr *)(skb->data + hdr_len);
701 /* check if the destination client was served by this node and it is now
702 * roaming. In this case, it means that the node has got a ROAM_ADV
703 * message and that it knows the new destination in the mesh to re-route
706 if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) {
707 if (batadv_reroute_unicast_packet(bat_priv, unicast_packet,
708 ethhdr->h_dest, vid))
709 net_ratelimited_function(batadv_dbg, BATADV_DBG_TT,
711 "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n",
712 unicast_packet->dest,
714 /* at this point the mesh destination should have been
715 * substituted with the originator address found in the global
716 * table. If not, let the packet go untouched anyway because
717 * there is nothing the node can do
722 /* retrieve the TTVN known by this node for the packet destination. This
723 * value is used later to check if the node which sent (or re-routed
724 * last time) the packet had an updated information or not
726 curr_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
727 if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) {
728 orig_node = batadv_orig_hash_find(bat_priv,
729 unicast_packet->dest);
730 /* if it is not possible to find the orig_node representing the
731 * destination, the packet can immediately be dropped as it will
732 * not be possible to deliver it
737 curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
738 batadv_orig_node_free_ref(orig_node);
741 /* check if the TTVN contained in the packet is fresher than what the
744 is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn);
748 old_ttvn = unicast_packet->ttvn;
749 /* the packet was forged based on outdated network information. Its
750 * destination can possibly be updated and forwarded towards the new
753 if (batadv_reroute_unicast_packet(bat_priv, unicast_packet,
754 ethhdr->h_dest, vid)) {
755 net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, bat_priv,
756 "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n",
757 unicast_packet->dest, ethhdr->h_dest,
758 old_ttvn, curr_ttvn);
762 /* the packet has not been re-routed: either the destination is
763 * currently served by this node or there is no destination at all and
764 * it is possible to drop the packet
766 if (!batadv_is_my_client(bat_priv, ethhdr->h_dest, vid))
769 /* update the header in order to let the packet be delivered to this
770 * node's soft interface
772 primary_if = batadv_primary_if_get_selected(bat_priv);
776 ether_addr_copy(unicast_packet->dest, primary_if->net_dev->dev_addr);
778 batadv_hardif_free_ref(primary_if);
780 unicast_packet->ttvn = curr_ttvn;
786 * batadv_recv_unhandled_unicast_packet - receive and process packets which
787 * are in the unicast number space but not yet known to the implementation
788 * @skb: unicast tvlv packet to process
789 * @recv_if: pointer to interface this packet was received on
791 * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
794 int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb,
795 struct batadv_hard_iface *recv_if)
797 struct batadv_unicast_packet *unicast_packet;
798 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
799 int check, hdr_size = sizeof(*unicast_packet);
801 check = batadv_check_unicast_packet(bat_priv, skb, hdr_size);
805 /* we don't know about this type, drop it. */
806 unicast_packet = (struct batadv_unicast_packet *)skb->data;
807 if (batadv_is_my_mac(bat_priv, unicast_packet->dest))
810 return batadv_route_unicast_packet(skb, recv_if);
813 int batadv_recv_unicast_packet(struct sk_buff *skb,
814 struct batadv_hard_iface *recv_if)
816 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
817 struct batadv_unicast_packet *unicast_packet;
818 struct batadv_unicast_4addr_packet *unicast_4addr_packet;
820 struct batadv_orig_node *orig_node = NULL;
821 int check, hdr_size = sizeof(*unicast_packet);
824 unicast_packet = (struct batadv_unicast_packet *)skb->data;
825 unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
827 is4addr = unicast_packet->packet_type == BATADV_UNICAST_4ADDR;
828 /* the caller function should have already pulled 2 bytes */
830 hdr_size = sizeof(*unicast_4addr_packet);
832 /* function returns -EREMOTE for promiscuous packets */
833 check = batadv_check_unicast_packet(bat_priv, skb, hdr_size);
835 /* Even though the packet is not for us, we might save it to use for
836 * decoding a later received coded packet
838 if (check == -EREMOTE)
839 batadv_nc_skb_store_sniffed_unicast(bat_priv, skb);
843 if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size))
847 if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) {
849 batadv_dat_inc_counter(bat_priv,
850 unicast_4addr_packet->subtype);
851 orig_addr = unicast_4addr_packet->src;
852 orig_node = batadv_orig_hash_find(bat_priv, orig_addr);
855 if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb,
858 if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb,
862 batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size,
867 batadv_orig_node_free_ref(orig_node);
869 return NET_RX_SUCCESS;
872 return batadv_route_unicast_packet(skb, recv_if);
876 * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets
877 * @skb: unicast tvlv packet to process
878 * @recv_if: pointer to interface this packet was received on
879 * @dst_addr: the payload destination
881 * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
884 int batadv_recv_unicast_tvlv(struct sk_buff *skb,
885 struct batadv_hard_iface *recv_if)
887 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
888 struct batadv_unicast_tvlv_packet *unicast_tvlv_packet;
889 unsigned char *tvlv_buff;
890 uint16_t tvlv_buff_len;
891 int hdr_size = sizeof(*unicast_tvlv_packet);
892 int ret = NET_RX_DROP;
894 if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0)
897 /* the header is likely to be modified while forwarding */
898 if (skb_cow(skb, hdr_size) < 0)
901 /* packet needs to be linearized to access the tvlv content */
902 if (skb_linearize(skb) < 0)
905 unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)skb->data;
907 tvlv_buff = (unsigned char *)(skb->data + hdr_size);
908 tvlv_buff_len = ntohs(unicast_tvlv_packet->tvlv_len);
910 if (tvlv_buff_len > skb->len - hdr_size)
913 ret = batadv_tvlv_containers_process(bat_priv, false, NULL,
914 unicast_tvlv_packet->src,
915 unicast_tvlv_packet->dst,
916 tvlv_buff, tvlv_buff_len);
918 if (ret != NET_RX_SUCCESS)
919 ret = batadv_route_unicast_packet(skb, recv_if);
927 * batadv_recv_frag_packet - process received fragment
928 * @skb: the received fragment
929 * @recv_if: interface that the skb is received on
931 * This function does one of the three following things: 1) Forward fragment, if
932 * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till
933 * lack further fragments; 3) Merge fragments, if we have all needed parts.
935 * Return NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise.
937 int batadv_recv_frag_packet(struct sk_buff *skb,
938 struct batadv_hard_iface *recv_if)
940 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
941 struct batadv_orig_node *orig_node_src = NULL;
942 struct batadv_frag_packet *frag_packet;
943 int ret = NET_RX_DROP;
945 if (batadv_check_unicast_packet(bat_priv, skb,
946 sizeof(*frag_packet)) < 0)
949 frag_packet = (struct batadv_frag_packet *)skb->data;
950 orig_node_src = batadv_orig_hash_find(bat_priv, frag_packet->orig);
954 /* Route the fragment if it is not for us and too big to be merged. */
955 if (!batadv_is_my_mac(bat_priv, frag_packet->dest) &&
956 batadv_frag_skb_fwd(skb, recv_if, orig_node_src)) {
957 ret = NET_RX_SUCCESS;
961 batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_RX);
962 batadv_add_counter(bat_priv, BATADV_CNT_FRAG_RX_BYTES, skb->len);
964 /* Add fragment to buffer and merge if possible. */
965 if (!batadv_frag_skb_buffer(&skb, orig_node_src))
968 /* Deliver merged packet to the appropriate handler, if it was
972 batadv_batman_skb_recv(skb, recv_if->net_dev,
973 &recv_if->batman_adv_ptype, NULL);
975 ret = NET_RX_SUCCESS;
979 batadv_orig_node_free_ref(orig_node_src);
984 int batadv_recv_bcast_packet(struct sk_buff *skb,
985 struct batadv_hard_iface *recv_if)
987 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
988 struct batadv_orig_node *orig_node = NULL;
989 struct batadv_bcast_packet *bcast_packet;
990 struct ethhdr *ethhdr;
991 int hdr_size = sizeof(*bcast_packet);
992 int ret = NET_RX_DROP;
996 /* drop packet if it has not necessary minimum size */
997 if (unlikely(!pskb_may_pull(skb, hdr_size)))
1000 ethhdr = eth_hdr(skb);
1002 /* packet with broadcast indication but unicast recipient */
1003 if (!is_broadcast_ether_addr(ethhdr->h_dest))
1006 /* packet with broadcast sender address */
1007 if (is_broadcast_ether_addr(ethhdr->h_source))
1010 /* ignore broadcasts sent by myself */
1011 if (batadv_is_my_mac(bat_priv, ethhdr->h_source))
1014 bcast_packet = (struct batadv_bcast_packet *)skb->data;
1016 /* ignore broadcasts originated by myself */
1017 if (batadv_is_my_mac(bat_priv, bcast_packet->orig))
1020 if (bcast_packet->ttl < 2)
1023 orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig);
1028 spin_lock_bh(&orig_node->bcast_seqno_lock);
1030 seqno = ntohl(bcast_packet->seqno);
1031 /* check whether the packet is a duplicate */
1032 if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno,
1036 seq_diff = seqno - orig_node->last_bcast_seqno;
1038 /* check whether the packet is old and the host just restarted. */
1039 if (batadv_window_protected(bat_priv, seq_diff,
1040 &orig_node->bcast_seqno_reset))
1043 /* mark broadcast in flood history, update window position
1046 if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1))
1047 orig_node->last_bcast_seqno = seqno;
1049 spin_unlock_bh(&orig_node->bcast_seqno_lock);
1051 /* check whether this has been sent by another originator before */
1052 if (batadv_bla_check_bcast_duplist(bat_priv, skb))
1055 batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet));
1057 /* rebroadcast packet */
1058 batadv_add_bcast_packet_to_list(bat_priv, skb, 1);
1060 /* don't hand the broadcast up if it is from an originator
1061 * from the same backbone.
1063 if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size))
1066 if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size))
1068 if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size))
1071 /* broadcast for me */
1072 batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size,
1076 ret = NET_RX_SUCCESS;
1080 spin_unlock_bh(&orig_node->bcast_seqno_lock);
1083 batadv_orig_node_free_ref(orig_node);