1 /* Copyright (C) 2007-2015 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 <linux/atomic.h>
22 #include <linux/byteorder/generic.h>
23 #include <linux/compiler.h>
24 #include <linux/errno.h>
25 #include <linux/etherdevice.h>
26 #include <linux/if_ether.h>
27 #include <linux/jiffies.h>
28 #include <linux/netdevice.h>
29 #include <linux/printk.h>
30 #include <linux/rculist.h>
31 #include <linux/rcupdate.h>
32 #include <linux/skbuff.h>
33 #include <linux/spinlock.h>
34 #include <linux/stddef.h>
37 #include "bridge_loop_avoidance.h"
38 #include "distributed-arp-table.h"
39 #include "fragmentation.h"
40 #include "hard-interface.h"
41 #include "icmp_socket.h"
42 #include "network-coding.h"
43 #include "originator.h"
46 #include "soft-interface.h"
47 #include "translation-table.h"
49 static int batadv_route_unicast_packet(struct sk_buff *skb,
50 struct batadv_hard_iface *recv_if);
53 * _batadv_update_route - set the router for this originator
54 * @bat_priv: the bat priv with all the soft interface information
55 * @orig_node: orig node which is to be configured
56 * @recv_if: the receive interface for which this route is set
57 * @neigh_node: neighbor which should be the next router
59 * This function does not perform any error checks
61 static void _batadv_update_route(struct batadv_priv *bat_priv,
62 struct batadv_orig_node *orig_node,
63 struct batadv_hard_iface *recv_if,
64 struct batadv_neigh_node *neigh_node)
66 struct batadv_orig_ifinfo *orig_ifinfo;
67 struct batadv_neigh_node *curr_router;
69 orig_ifinfo = batadv_orig_ifinfo_get(orig_node, recv_if);
74 curr_router = rcu_dereference(orig_ifinfo->router);
75 if (curr_router && !atomic_inc_not_zero(&curr_router->refcount))
80 if ((curr_router) && (!neigh_node)) {
81 batadv_dbg(BATADV_DBG_ROUTES, bat_priv,
82 "Deleting route towards: %pM\n", orig_node->orig);
83 batadv_tt_global_del_orig(bat_priv, orig_node, -1,
84 "Deleted route towards originator");
87 } else if ((!curr_router) && (neigh_node)) {
88 batadv_dbg(BATADV_DBG_ROUTES, bat_priv,
89 "Adding route towards: %pM (via %pM)\n",
90 orig_node->orig, neigh_node->addr);
92 } else if (neigh_node && curr_router) {
93 batadv_dbg(BATADV_DBG_ROUTES, bat_priv,
94 "Changing route towards: %pM (now via %pM - was via %pM)\n",
95 orig_node->orig, neigh_node->addr,
100 batadv_neigh_node_free_ref(curr_router);
102 /* increase refcount of new best neighbor */
103 if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount))
106 spin_lock_bh(&orig_node->neigh_list_lock);
107 /* curr_router used earlier may not be the current orig_ifinfo->router
108 * anymore because it was dereferenced outside of the neigh_list_lock
109 * protected region. After the new best neighbor has replace the current
110 * best neighbor the reference counter needs to decrease. Consequently,
111 * the code needs to ensure the curr_router variable contains a pointer
112 * to the replaced best neighbor.
114 curr_router = rcu_dereference_protected(orig_ifinfo->router, true);
116 rcu_assign_pointer(orig_ifinfo->router, neigh_node);
117 spin_unlock_bh(&orig_node->neigh_list_lock);
118 batadv_orig_ifinfo_free_ref(orig_ifinfo);
120 /* decrease refcount of previous best neighbor */
122 batadv_neigh_node_free_ref(curr_router);
126 * batadv_update_route - set the router for this originator
127 * @bat_priv: the bat priv with all the soft interface information
128 * @orig_node: orig node which is to be configured
129 * @recv_if: the receive interface for which this route is set
130 * @neigh_node: neighbor which should be the next router
132 void batadv_update_route(struct batadv_priv *bat_priv,
133 struct batadv_orig_node *orig_node,
134 struct batadv_hard_iface *recv_if,
135 struct batadv_neigh_node *neigh_node)
137 struct batadv_neigh_node *router = NULL;
142 router = batadv_orig_router_get(orig_node, recv_if);
144 if (router != neigh_node)
145 _batadv_update_route(bat_priv, orig_node, recv_if, neigh_node);
149 batadv_neigh_node_free_ref(router);
152 /* checks whether the host restarted and is in the protection time.
154 * 0 if the packet is to be accepted
155 * 1 if the packet is to be ignored.
157 int batadv_window_protected(struct batadv_priv *bat_priv, s32 seq_num_diff,
158 unsigned long *last_reset)
160 if (seq_num_diff <= -BATADV_TQ_LOCAL_WINDOW_SIZE ||
161 seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) {
162 if (!batadv_has_timed_out(*last_reset,
163 BATADV_RESET_PROTECTION_MS))
166 *last_reset = jiffies;
167 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
168 "old packet received, start protection\n");
174 bool batadv_check_management_packet(struct sk_buff *skb,
175 struct batadv_hard_iface *hard_iface,
178 struct ethhdr *ethhdr;
180 /* drop packet if it has not necessary minimum size */
181 if (unlikely(!pskb_may_pull(skb, header_len)))
184 ethhdr = eth_hdr(skb);
186 /* packet with broadcast indication but unicast recipient */
187 if (!is_broadcast_ether_addr(ethhdr->h_dest))
190 /* packet with broadcast sender address */
191 if (is_broadcast_ether_addr(ethhdr->h_source))
194 /* create a copy of the skb, if needed, to modify it. */
195 if (skb_cow(skb, 0) < 0)
198 /* keep skb linear */
199 if (skb_linearize(skb) < 0)
206 * batadv_recv_my_icmp_packet - receive an icmp packet locally
207 * @bat_priv: the bat priv with all the soft interface information
208 * @skb: icmp packet to process
210 * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
213 static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv,
216 struct batadv_hard_iface *primary_if = NULL;
217 struct batadv_orig_node *orig_node = NULL;
218 struct batadv_icmp_header *icmph;
219 int res, ret = NET_RX_DROP;
221 icmph = (struct batadv_icmp_header *)skb->data;
223 switch (icmph->msg_type) {
224 case BATADV_ECHO_REPLY:
225 case BATADV_DESTINATION_UNREACHABLE:
226 case BATADV_TTL_EXCEEDED:
227 /* receive the packet */
228 if (skb_linearize(skb) < 0)
231 batadv_socket_receive_packet(icmph, skb->len);
233 case BATADV_ECHO_REQUEST:
234 /* answer echo request (ping) */
235 primary_if = batadv_primary_if_get_selected(bat_priv);
239 /* get routing information */
240 orig_node = batadv_orig_hash_find(bat_priv, icmph->orig);
244 /* create a copy of the skb, if needed, to modify it. */
245 if (skb_cow(skb, ETH_HLEN) < 0)
248 icmph = (struct batadv_icmp_header *)skb->data;
250 ether_addr_copy(icmph->dst, icmph->orig);
251 ether_addr_copy(icmph->orig, primary_if->net_dev->dev_addr);
252 icmph->msg_type = BATADV_ECHO_REPLY;
253 icmph->ttl = BATADV_TTL;
255 res = batadv_send_skb_to_orig(skb, orig_node, NULL);
256 if (res != NET_XMIT_DROP)
257 ret = NET_RX_SUCCESS;
261 /* drop unknown type */
266 batadv_hardif_free_ref(primary_if);
268 batadv_orig_node_free_ref(orig_node);
272 static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv,
275 struct batadv_hard_iface *primary_if = NULL;
276 struct batadv_orig_node *orig_node = NULL;
277 struct batadv_icmp_packet *icmp_packet;
278 int ret = NET_RX_DROP;
280 icmp_packet = (struct batadv_icmp_packet *)skb->data;
282 /* send TTL exceeded if packet is an echo request (traceroute) */
283 if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) {
284 pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n",
285 icmp_packet->orig, icmp_packet->dst);
289 primary_if = batadv_primary_if_get_selected(bat_priv);
293 /* get routing information */
294 orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig);
298 /* create a copy of the skb, if needed, to modify it. */
299 if (skb_cow(skb, ETH_HLEN) < 0)
302 icmp_packet = (struct batadv_icmp_packet *)skb->data;
304 ether_addr_copy(icmp_packet->dst, icmp_packet->orig);
305 ether_addr_copy(icmp_packet->orig, primary_if->net_dev->dev_addr);
306 icmp_packet->msg_type = BATADV_TTL_EXCEEDED;
307 icmp_packet->ttl = BATADV_TTL;
309 if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP)
310 ret = NET_RX_SUCCESS;
314 batadv_hardif_free_ref(primary_if);
316 batadv_orig_node_free_ref(orig_node);
320 int batadv_recv_icmp_packet(struct sk_buff *skb,
321 struct batadv_hard_iface *recv_if)
323 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
324 struct batadv_icmp_header *icmph;
325 struct batadv_icmp_packet_rr *icmp_packet_rr;
326 struct ethhdr *ethhdr;
327 struct batadv_orig_node *orig_node = NULL;
328 int hdr_size = sizeof(struct batadv_icmp_header);
329 int ret = NET_RX_DROP;
331 /* drop packet if it has not necessary minimum size */
332 if (unlikely(!pskb_may_pull(skb, hdr_size)))
335 ethhdr = eth_hdr(skb);
337 /* packet with unicast indication but broadcast recipient */
338 if (is_broadcast_ether_addr(ethhdr->h_dest))
341 /* packet with broadcast sender address */
342 if (is_broadcast_ether_addr(ethhdr->h_source))
346 if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest))
349 icmph = (struct batadv_icmp_header *)skb->data;
351 /* add record route information if not full */
352 if ((icmph->msg_type == BATADV_ECHO_REPLY ||
353 icmph->msg_type == BATADV_ECHO_REQUEST) &&
354 (skb->len >= sizeof(struct batadv_icmp_packet_rr))) {
355 if (skb_linearize(skb) < 0)
358 /* create a copy of the skb, if needed, to modify it. */
359 if (skb_cow(skb, ETH_HLEN) < 0)
362 icmph = (struct batadv_icmp_header *)skb->data;
363 icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmph;
364 if (icmp_packet_rr->rr_cur >= BATADV_RR_LEN)
367 ether_addr_copy(icmp_packet_rr->rr[icmp_packet_rr->rr_cur],
369 icmp_packet_rr->rr_cur++;
373 if (batadv_is_my_mac(bat_priv, icmph->dst))
374 return batadv_recv_my_icmp_packet(bat_priv, skb);
378 return batadv_recv_icmp_ttl_exceeded(bat_priv, skb);
380 /* get routing information */
381 orig_node = batadv_orig_hash_find(bat_priv, icmph->dst);
385 /* create a copy of the skb, if needed, to modify it. */
386 if (skb_cow(skb, ETH_HLEN) < 0)
389 icmph = (struct batadv_icmp_header *)skb->data;
395 if (batadv_send_skb_to_orig(skb, orig_node, recv_if) != NET_XMIT_DROP)
396 ret = NET_RX_SUCCESS;
400 batadv_orig_node_free_ref(orig_node);
405 * batadv_check_unicast_packet - Check for malformed unicast packets
406 * @bat_priv: the bat priv with all the soft interface information
407 * @skb: packet to check
408 * @hdr_size: size of header to pull
410 * Check for short header and bad addresses in given packet. Returns negative
411 * value when check fails and 0 otherwise. The negative value depends on the
412 * reason: -ENODATA for bad header, -EBADR for broadcast destination or source,
413 * and -EREMOTE for non-local (other host) destination.
415 static int batadv_check_unicast_packet(struct batadv_priv *bat_priv,
416 struct sk_buff *skb, int hdr_size)
418 struct ethhdr *ethhdr;
420 /* drop packet if it has not necessary minimum size */
421 if (unlikely(!pskb_may_pull(skb, hdr_size)))
424 ethhdr = eth_hdr(skb);
426 /* packet with unicast indication but broadcast recipient */
427 if (is_broadcast_ether_addr(ethhdr->h_dest))
430 /* packet with broadcast sender address */
431 if (is_broadcast_ether_addr(ethhdr->h_source))
435 if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest))
442 * batadv_find_router - find a suitable router for this originator
443 * @bat_priv: the bat priv with all the soft interface information
444 * @orig_node: the destination node
445 * @recv_if: pointer to interface this packet was received on
447 * Returns the router which should be used for this orig_node on
448 * this interface, or NULL if not available.
450 struct batadv_neigh_node *
451 batadv_find_router(struct batadv_priv *bat_priv,
452 struct batadv_orig_node *orig_node,
453 struct batadv_hard_iface *recv_if)
455 struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
456 struct batadv_neigh_node *first_candidate_router = NULL;
457 struct batadv_neigh_node *next_candidate_router = NULL;
458 struct batadv_neigh_node *router, *cand_router = NULL;
459 struct batadv_neigh_node *last_cand_router = NULL;
460 struct batadv_orig_ifinfo *cand, *first_candidate = NULL;
461 struct batadv_orig_ifinfo *next_candidate = NULL;
462 struct batadv_orig_ifinfo *last_candidate;
463 bool last_candidate_found = false;
468 router = batadv_orig_router_get(orig_node, recv_if);
473 /* only consider bonding for recv_if == BATADV_IF_DEFAULT (first hop)
476 if (!(recv_if == BATADV_IF_DEFAULT && atomic_read(&bat_priv->bonding)))
479 /* bonding: loop through the list of possible routers found
480 * for the various outgoing interfaces and find a candidate after
481 * the last chosen bonding candidate (next_candidate). If no such
482 * router is found, use the first candidate found (the previously
483 * chosen bonding candidate might have been the last one in the list).
484 * If this can't be found either, return the previously chosen
485 * router - obviously there are no other candidates.
488 last_candidate = orig_node->last_bonding_candidate;
490 last_cand_router = rcu_dereference(last_candidate->router);
492 hlist_for_each_entry_rcu(cand, &orig_node->ifinfo_list, list) {
493 /* acquire some structures and references ... */
494 if (!atomic_inc_not_zero(&cand->refcount))
497 cand_router = rcu_dereference(cand->router);
501 if (!atomic_inc_not_zero(&cand_router->refcount)) {
506 /* alternative candidate should be good enough to be
509 if (!bao->bat_neigh_is_equiv_or_better(cand_router,
514 /* don't use the same router twice */
515 if (last_cand_router == cand_router)
518 /* mark the first possible candidate */
519 if (!first_candidate) {
520 atomic_inc(&cand_router->refcount);
521 atomic_inc(&cand->refcount);
522 first_candidate = cand;
523 first_candidate_router = cand_router;
526 /* check if the loop has already passed the previously selected
527 * candidate ... this function should select the next candidate
528 * AFTER the previously used bonding candidate.
530 if (!last_candidate || last_candidate_found) {
531 next_candidate = cand;
532 next_candidate_router = cand_router;
536 if (last_candidate == cand)
537 last_candidate_found = true;
539 /* free references */
541 batadv_neigh_node_free_ref(cand_router);
544 batadv_orig_ifinfo_free_ref(cand);
548 /* last_bonding_candidate is reset below, remove the old reference. */
549 if (orig_node->last_bonding_candidate)
550 batadv_orig_ifinfo_free_ref(orig_node->last_bonding_candidate);
552 /* After finding candidates, handle the three cases:
553 * 1) there is a next candidate, use that
554 * 2) there is no next candidate, use the first of the list
555 * 3) there is no candidate at all, return the default router
557 if (next_candidate) {
558 batadv_neigh_node_free_ref(router);
560 /* remove references to first candidate, we don't need it. */
561 if (first_candidate) {
562 batadv_neigh_node_free_ref(first_candidate_router);
563 batadv_orig_ifinfo_free_ref(first_candidate);
565 router = next_candidate_router;
566 orig_node->last_bonding_candidate = next_candidate;
567 } else if (first_candidate) {
568 batadv_neigh_node_free_ref(router);
570 /* refcounting has already been done in the loop above. */
571 router = first_candidate_router;
572 orig_node->last_bonding_candidate = first_candidate;
574 orig_node->last_bonding_candidate = NULL;
580 static int batadv_route_unicast_packet(struct sk_buff *skb,
581 struct batadv_hard_iface *recv_if)
583 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
584 struct batadv_orig_node *orig_node = NULL;
585 struct batadv_unicast_packet *unicast_packet;
586 struct ethhdr *ethhdr = eth_hdr(skb);
587 int res, hdr_len, ret = NET_RX_DROP;
589 unicast_packet = (struct batadv_unicast_packet *)skb->data;
592 if (unicast_packet->ttl < 2) {
593 pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n",
594 ethhdr->h_source, unicast_packet->dest);
598 /* get routing information */
599 orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest);
604 /* create a copy of the skb, if needed, to modify it. */
605 if (skb_cow(skb, ETH_HLEN) < 0)
609 unicast_packet = (struct batadv_unicast_packet *)skb->data;
610 unicast_packet->ttl--;
612 switch (unicast_packet->packet_type) {
613 case BATADV_UNICAST_4ADDR:
614 hdr_len = sizeof(struct batadv_unicast_4addr_packet);
617 hdr_len = sizeof(struct batadv_unicast_packet);
620 /* other packet types not supported - yet */
626 batadv_skb_set_priority(skb, hdr_len);
628 res = batadv_send_skb_to_orig(skb, orig_node, recv_if);
630 /* translate transmit result into receive result */
631 if (res == NET_XMIT_SUCCESS) {
632 /* skb was transmitted and consumed */
633 batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD);
634 batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES,
635 skb->len + ETH_HLEN);
637 ret = NET_RX_SUCCESS;
638 } else if (res == NET_XMIT_POLICED) {
639 /* skb was buffered and consumed */
640 ret = NET_RX_SUCCESS;
645 batadv_orig_node_free_ref(orig_node);
650 * batadv_reroute_unicast_packet - update the unicast header for re-routing
651 * @bat_priv: the bat priv with all the soft interface information
652 * @unicast_packet: the unicast header to be updated
653 * @dst_addr: the payload destination
654 * @vid: VLAN identifier
656 * Search the translation table for dst_addr and update the unicast header with
657 * the new corresponding information (originator address where the destination
658 * client currently is and its known TTVN)
660 * Returns true if the packet header has been updated, false otherwise
663 batadv_reroute_unicast_packet(struct batadv_priv *bat_priv,
664 struct batadv_unicast_packet *unicast_packet,
665 u8 *dst_addr, unsigned short vid)
667 struct batadv_orig_node *orig_node = NULL;
668 struct batadv_hard_iface *primary_if = NULL;
670 u8 *orig_addr, orig_ttvn;
672 if (batadv_is_my_client(bat_priv, dst_addr, vid)) {
673 primary_if = batadv_primary_if_get_selected(bat_priv);
676 orig_addr = primary_if->net_dev->dev_addr;
677 orig_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
679 orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr,
684 if (batadv_compare_eth(orig_node->orig, unicast_packet->dest))
687 orig_addr = orig_node->orig;
688 orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn);
691 /* update the packet header */
692 ether_addr_copy(unicast_packet->dest, orig_addr);
693 unicast_packet->ttvn = orig_ttvn;
698 batadv_hardif_free_ref(primary_if);
700 batadv_orig_node_free_ref(orig_node);
705 static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv,
706 struct sk_buff *skb, int hdr_len) {
707 struct batadv_unicast_packet *unicast_packet;
708 struct batadv_hard_iface *primary_if;
709 struct batadv_orig_node *orig_node;
710 u8 curr_ttvn, old_ttvn;
711 struct ethhdr *ethhdr;
715 /* check if there is enough data before accessing it */
716 if (!pskb_may_pull(skb, hdr_len + ETH_HLEN))
719 /* create a copy of the skb (in case of for re-routing) to modify it. */
720 if (skb_cow(skb, sizeof(*unicast_packet)) < 0)
723 unicast_packet = (struct batadv_unicast_packet *)skb->data;
724 vid = batadv_get_vid(skb, hdr_len);
725 ethhdr = (struct ethhdr *)(skb->data + hdr_len);
727 /* check if the destination client was served by this node and it is now
728 * roaming. In this case, it means that the node has got a ROAM_ADV
729 * message and that it knows the new destination in the mesh to re-route
732 if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) {
733 if (batadv_reroute_unicast_packet(bat_priv, unicast_packet,
734 ethhdr->h_dest, vid))
735 batadv_dbg_ratelimited(BATADV_DBG_TT,
737 "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n",
738 unicast_packet->dest,
740 /* at this point the mesh destination should have been
741 * substituted with the originator address found in the global
742 * table. If not, let the packet go untouched anyway because
743 * there is nothing the node can do
748 /* retrieve the TTVN known by this node for the packet destination. This
749 * value is used later to check if the node which sent (or re-routed
750 * last time) the packet had an updated information or not
752 curr_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
753 if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) {
754 orig_node = batadv_orig_hash_find(bat_priv,
755 unicast_packet->dest);
756 /* if it is not possible to find the orig_node representing the
757 * destination, the packet can immediately be dropped as it will
758 * not be possible to deliver it
763 curr_ttvn = (u8)atomic_read(&orig_node->last_ttvn);
764 batadv_orig_node_free_ref(orig_node);
767 /* check if the TTVN contained in the packet is fresher than what the
770 is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn);
774 old_ttvn = unicast_packet->ttvn;
775 /* the packet was forged based on outdated network information. Its
776 * destination can possibly be updated and forwarded towards the new
779 if (batadv_reroute_unicast_packet(bat_priv, unicast_packet,
780 ethhdr->h_dest, vid)) {
781 batadv_dbg_ratelimited(BATADV_DBG_TT, bat_priv,
782 "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n",
783 unicast_packet->dest, ethhdr->h_dest,
784 old_ttvn, curr_ttvn);
788 /* the packet has not been re-routed: either the destination is
789 * currently served by this node or there is no destination at all and
790 * it is possible to drop the packet
792 if (!batadv_is_my_client(bat_priv, ethhdr->h_dest, vid))
795 /* update the header in order to let the packet be delivered to this
796 * node's soft interface
798 primary_if = batadv_primary_if_get_selected(bat_priv);
802 ether_addr_copy(unicast_packet->dest, primary_if->net_dev->dev_addr);
804 batadv_hardif_free_ref(primary_if);
806 unicast_packet->ttvn = curr_ttvn;
812 * batadv_recv_unhandled_unicast_packet - receive and process packets which
813 * are in the unicast number space but not yet known to the implementation
814 * @skb: unicast tvlv packet to process
815 * @recv_if: pointer to interface this packet was received on
817 * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
820 int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb,
821 struct batadv_hard_iface *recv_if)
823 struct batadv_unicast_packet *unicast_packet;
824 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
825 int check, hdr_size = sizeof(*unicast_packet);
827 check = batadv_check_unicast_packet(bat_priv, skb, hdr_size);
831 /* we don't know about this type, drop it. */
832 unicast_packet = (struct batadv_unicast_packet *)skb->data;
833 if (batadv_is_my_mac(bat_priv, unicast_packet->dest))
836 return batadv_route_unicast_packet(skb, recv_if);
839 int batadv_recv_unicast_packet(struct sk_buff *skb,
840 struct batadv_hard_iface *recv_if)
842 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
843 struct batadv_unicast_packet *unicast_packet;
844 struct batadv_unicast_4addr_packet *unicast_4addr_packet;
846 struct batadv_orig_node *orig_node = NULL;
847 int check, hdr_size = sizeof(*unicast_packet);
848 enum batadv_subtype subtype;
851 unicast_packet = (struct batadv_unicast_packet *)skb->data;
852 unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
854 is4addr = unicast_packet->packet_type == BATADV_UNICAST_4ADDR;
855 /* the caller function should have already pulled 2 bytes */
857 hdr_size = sizeof(*unicast_4addr_packet);
859 /* function returns -EREMOTE for promiscuous packets */
860 check = batadv_check_unicast_packet(bat_priv, skb, hdr_size);
862 /* Even though the packet is not for us, we might save it to use for
863 * decoding a later received coded packet
865 if (check == -EREMOTE)
866 batadv_nc_skb_store_sniffed_unicast(bat_priv, skb);
870 if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size))
874 if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) {
876 subtype = unicast_4addr_packet->subtype;
877 batadv_dat_inc_counter(bat_priv, subtype);
879 /* Only payload data should be considered for speedy
880 * join. For example, DAT also uses unicast 4addr
881 * types, but those packets should not be considered
882 * for speedy join, since the clients do not actually
883 * reside at the sending originator.
885 if (subtype == BATADV_P_DATA) {
886 orig_addr = unicast_4addr_packet->src;
887 orig_node = batadv_orig_hash_find(bat_priv,
892 if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb,
895 if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb,
899 batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size,
904 batadv_orig_node_free_ref(orig_node);
906 return NET_RX_SUCCESS;
909 return batadv_route_unicast_packet(skb, recv_if);
913 * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets
914 * @skb: unicast tvlv packet to process
915 * @recv_if: pointer to interface this packet was received on
916 * @dst_addr: the payload destination
918 * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
921 int batadv_recv_unicast_tvlv(struct sk_buff *skb,
922 struct batadv_hard_iface *recv_if)
924 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
925 struct batadv_unicast_tvlv_packet *unicast_tvlv_packet;
926 unsigned char *tvlv_buff;
928 int hdr_size = sizeof(*unicast_tvlv_packet);
929 int ret = NET_RX_DROP;
931 if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0)
934 /* the header is likely to be modified while forwarding */
935 if (skb_cow(skb, hdr_size) < 0)
938 /* packet needs to be linearized to access the tvlv content */
939 if (skb_linearize(skb) < 0)
942 unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)skb->data;
944 tvlv_buff = (unsigned char *)(skb->data + hdr_size);
945 tvlv_buff_len = ntohs(unicast_tvlv_packet->tvlv_len);
947 if (tvlv_buff_len > skb->len - hdr_size)
950 ret = batadv_tvlv_containers_process(bat_priv, false, NULL,
951 unicast_tvlv_packet->src,
952 unicast_tvlv_packet->dst,
953 tvlv_buff, tvlv_buff_len);
955 if (ret != NET_RX_SUCCESS)
956 ret = batadv_route_unicast_packet(skb, recv_if);
964 * batadv_recv_frag_packet - process received fragment
965 * @skb: the received fragment
966 * @recv_if: interface that the skb is received on
968 * This function does one of the three following things: 1) Forward fragment, if
969 * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till
970 * lack further fragments; 3) Merge fragments, if we have all needed parts.
972 * Return NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise.
974 int batadv_recv_frag_packet(struct sk_buff *skb,
975 struct batadv_hard_iface *recv_if)
977 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
978 struct batadv_orig_node *orig_node_src = NULL;
979 struct batadv_frag_packet *frag_packet;
980 int ret = NET_RX_DROP;
982 if (batadv_check_unicast_packet(bat_priv, skb,
983 sizeof(*frag_packet)) < 0)
986 frag_packet = (struct batadv_frag_packet *)skb->data;
987 orig_node_src = batadv_orig_hash_find(bat_priv, frag_packet->orig);
991 /* Route the fragment if it is not for us and too big to be merged. */
992 if (!batadv_is_my_mac(bat_priv, frag_packet->dest) &&
993 batadv_frag_skb_fwd(skb, recv_if, orig_node_src)) {
994 ret = NET_RX_SUCCESS;
998 batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_RX);
999 batadv_add_counter(bat_priv, BATADV_CNT_FRAG_RX_BYTES, skb->len);
1001 /* Add fragment to buffer and merge if possible. */
1002 if (!batadv_frag_skb_buffer(&skb, orig_node_src))
1005 /* Deliver merged packet to the appropriate handler, if it was
1009 batadv_batman_skb_recv(skb, recv_if->net_dev,
1010 &recv_if->batman_adv_ptype, NULL);
1012 ret = NET_RX_SUCCESS;
1016 batadv_orig_node_free_ref(orig_node_src);
1021 int batadv_recv_bcast_packet(struct sk_buff *skb,
1022 struct batadv_hard_iface *recv_if)
1024 struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
1025 struct batadv_orig_node *orig_node = NULL;
1026 struct batadv_bcast_packet *bcast_packet;
1027 struct ethhdr *ethhdr;
1028 int hdr_size = sizeof(*bcast_packet);
1029 int ret = NET_RX_DROP;
1033 /* drop packet if it has not necessary minimum size */
1034 if (unlikely(!pskb_may_pull(skb, hdr_size)))
1037 ethhdr = eth_hdr(skb);
1039 /* packet with broadcast indication but unicast recipient */
1040 if (!is_broadcast_ether_addr(ethhdr->h_dest))
1043 /* packet with broadcast sender address */
1044 if (is_broadcast_ether_addr(ethhdr->h_source))
1047 /* ignore broadcasts sent by myself */
1048 if (batadv_is_my_mac(bat_priv, ethhdr->h_source))
1051 bcast_packet = (struct batadv_bcast_packet *)skb->data;
1053 /* ignore broadcasts originated by myself */
1054 if (batadv_is_my_mac(bat_priv, bcast_packet->orig))
1057 if (bcast_packet->ttl < 2)
1060 orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig);
1065 spin_lock_bh(&orig_node->bcast_seqno_lock);
1067 seqno = ntohl(bcast_packet->seqno);
1068 /* check whether the packet is a duplicate */
1069 if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno,
1073 seq_diff = seqno - orig_node->last_bcast_seqno;
1075 /* check whether the packet is old and the host just restarted. */
1076 if (batadv_window_protected(bat_priv, seq_diff,
1077 &orig_node->bcast_seqno_reset))
1080 /* mark broadcast in flood history, update window position
1083 if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1))
1084 orig_node->last_bcast_seqno = seqno;
1086 spin_unlock_bh(&orig_node->bcast_seqno_lock);
1088 /* check whether this has been sent by another originator before */
1089 if (batadv_bla_check_bcast_duplist(bat_priv, skb))
1092 batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet));
1094 /* rebroadcast packet */
1095 batadv_add_bcast_packet_to_list(bat_priv, skb, 1);
1097 /* don't hand the broadcast up if it is from an originator
1098 * from the same backbone.
1100 if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size))
1103 if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size))
1105 if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size))
1108 /* broadcast for me */
1109 batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size,
1113 ret = NET_RX_SUCCESS;
1117 spin_unlock_bh(&orig_node->bcast_seqno_lock);
1120 batadv_orig_node_free_ref(orig_node);