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
);
449 /* only consider bonding for recv_if == BATADV_IF_DEFAULT (first hop)
452 if (!(recv_if
== BATADV_IF_DEFAULT
&& atomic_read(&bat_priv
->bonding
)))
455 /* bonding: loop through the list of possible routers found
456 * for the various outgoing interfaces and find a candidate after
457 * the last chosen bonding candidate (next_candidate). If no such
458 * router is found, use the first candidate found (the previously
459 * chosen bonding candidate might have been the last one in the list).
460 * If this can't be found either, return the previously choosen
461 * router - obviously there are no other candidates.
464 last_candidate
= orig_node
->last_bonding_candidate
;
466 last_cand_router
= rcu_dereference(last_candidate
->router
);
468 hlist_for_each_entry_rcu(cand
, &orig_node
->ifinfo_list
, list
) {
469 /* acquire some structures and references ... */
470 if (!atomic_inc_not_zero(&cand
->refcount
))
473 cand_router
= rcu_dereference(cand
->router
);
477 if (!atomic_inc_not_zero(&cand_router
->refcount
)) {
482 /* alternative candidate should be good enough to be
485 if (!bao
->bat_neigh_is_equiv_or_better(cand_router
,
490 /* don't use the same router twice */
491 if (last_cand_router
== cand_router
)
494 /* mark the first possible candidate */
495 if (!first_candidate
) {
496 atomic_inc(&cand_router
->refcount
);
497 atomic_inc(&cand
->refcount
);
498 first_candidate
= cand
;
499 first_candidate_router
= cand_router
;
502 /* check if the loop has already passed the previously selected
503 * candidate ... this function should select the next candidate
504 * AFTER the previously used bonding candidate.
506 if (!last_candidate
|| last_candidate_found
) {
507 next_candidate
= cand
;
508 next_candidate_router
= cand_router
;
512 if (last_candidate
== cand
)
513 last_candidate_found
= true;
515 /* free references */
517 batadv_neigh_node_free_ref(cand_router
);
520 batadv_orig_ifinfo_free_ref(cand
);
524 /* last_bonding_candidate is reset below, remove the old reference. */
525 if (orig_node
->last_bonding_candidate
)
526 batadv_orig_ifinfo_free_ref(orig_node
->last_bonding_candidate
);
528 /* After finding candidates, handle the three cases:
529 * 1) there is a next candidate, use that
530 * 2) there is no next candidate, use the first of the list
531 * 3) there is no candidate at all, return the default router
533 if (next_candidate
) {
534 batadv_neigh_node_free_ref(router
);
536 /* remove references to first candidate, we don't need it. */
537 if (first_candidate
) {
538 batadv_neigh_node_free_ref(first_candidate_router
);
539 batadv_orig_ifinfo_free_ref(first_candidate
);
541 router
= next_candidate_router
;
542 orig_node
->last_bonding_candidate
= next_candidate
;
543 } else if (first_candidate
) {
544 batadv_neigh_node_free_ref(router
);
546 /* refcounting has already been done in the loop above. */
547 router
= first_candidate_router
;
548 orig_node
->last_bonding_candidate
= first_candidate
;
550 orig_node
->last_bonding_candidate
= NULL
;
556 static int batadv_route_unicast_packet(struct sk_buff
*skb
,
557 struct batadv_hard_iface
*recv_if
)
559 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
560 struct batadv_orig_node
*orig_node
= NULL
;
561 struct batadv_unicast_packet
*unicast_packet
;
562 struct ethhdr
*ethhdr
= eth_hdr(skb
);
563 int res
, hdr_len
, ret
= NET_RX_DROP
;
565 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
568 if (unicast_packet
->ttl
< 2) {
569 pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n",
570 ethhdr
->h_source
, unicast_packet
->dest
);
574 /* get routing information */
575 orig_node
= batadv_orig_hash_find(bat_priv
, unicast_packet
->dest
);
580 /* create a copy of the skb, if needed, to modify it. */
581 if (skb_cow(skb
, ETH_HLEN
) < 0)
585 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
586 unicast_packet
->ttl
--;
588 switch (unicast_packet
->packet_type
) {
589 case BATADV_UNICAST_4ADDR
:
590 hdr_len
= sizeof(struct batadv_unicast_4addr_packet
);
593 hdr_len
= sizeof(struct batadv_unicast_packet
);
596 /* other packet types not supported - yet */
602 batadv_skb_set_priority(skb
, hdr_len
);
604 res
= batadv_send_skb_to_orig(skb
, orig_node
, recv_if
);
606 /* translate transmit result into receive result */
607 if (res
== NET_XMIT_SUCCESS
) {
608 /* skb was transmitted and consumed */
609 batadv_inc_counter(bat_priv
, BATADV_CNT_FORWARD
);
610 batadv_add_counter(bat_priv
, BATADV_CNT_FORWARD_BYTES
,
611 skb
->len
+ ETH_HLEN
);
613 ret
= NET_RX_SUCCESS
;
614 } else if (res
== NET_XMIT_POLICED
) {
615 /* skb was buffered and consumed */
616 ret
= NET_RX_SUCCESS
;
621 batadv_orig_node_free_ref(orig_node
);
626 * batadv_reroute_unicast_packet - update the unicast header for re-routing
627 * @bat_priv: the bat priv with all the soft interface information
628 * @unicast_packet: the unicast header to be updated
629 * @dst_addr: the payload destination
630 * @vid: VLAN identifier
632 * Search the translation table for dst_addr and update the unicast header with
633 * the new corresponding information (originator address where the destination
634 * client currently is and its known TTVN)
636 * Returns true if the packet header has been updated, false otherwise
639 batadv_reroute_unicast_packet(struct batadv_priv
*bat_priv
,
640 struct batadv_unicast_packet
*unicast_packet
,
641 uint8_t *dst_addr
, unsigned short vid
)
643 struct batadv_orig_node
*orig_node
= NULL
;
644 struct batadv_hard_iface
*primary_if
= NULL
;
646 uint8_t *orig_addr
, orig_ttvn
;
648 if (batadv_is_my_client(bat_priv
, dst_addr
, vid
)) {
649 primary_if
= batadv_primary_if_get_selected(bat_priv
);
652 orig_addr
= primary_if
->net_dev
->dev_addr
;
653 orig_ttvn
= (uint8_t)atomic_read(&bat_priv
->tt
.vn
);
655 orig_node
= batadv_transtable_search(bat_priv
, NULL
, dst_addr
,
660 if (batadv_compare_eth(orig_node
->orig
, unicast_packet
->dest
))
663 orig_addr
= orig_node
->orig
;
664 orig_ttvn
= (uint8_t)atomic_read(&orig_node
->last_ttvn
);
667 /* update the packet header */
668 ether_addr_copy(unicast_packet
->dest
, orig_addr
);
669 unicast_packet
->ttvn
= orig_ttvn
;
674 batadv_hardif_free_ref(primary_if
);
676 batadv_orig_node_free_ref(orig_node
);
681 static int batadv_check_unicast_ttvn(struct batadv_priv
*bat_priv
,
682 struct sk_buff
*skb
, int hdr_len
) {
683 struct batadv_unicast_packet
*unicast_packet
;
684 struct batadv_hard_iface
*primary_if
;
685 struct batadv_orig_node
*orig_node
;
686 uint8_t curr_ttvn
, old_ttvn
;
687 struct ethhdr
*ethhdr
;
691 /* check if there is enough data before accessing it */
692 if (!pskb_may_pull(skb
, hdr_len
+ ETH_HLEN
))
695 /* create a copy of the skb (in case of for re-routing) to modify it. */
696 if (skb_cow(skb
, sizeof(*unicast_packet
)) < 0)
699 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
700 vid
= batadv_get_vid(skb
, hdr_len
);
701 ethhdr
= (struct ethhdr
*)(skb
->data
+ hdr_len
);
703 /* check if the destination client was served by this node and it is now
704 * roaming. In this case, it means that the node has got a ROAM_ADV
705 * message and that it knows the new destination in the mesh to re-route
708 if (batadv_tt_local_client_is_roaming(bat_priv
, ethhdr
->h_dest
, vid
)) {
709 if (batadv_reroute_unicast_packet(bat_priv
, unicast_packet
,
710 ethhdr
->h_dest
, vid
))
711 batadv_dbg_ratelimited(BATADV_DBG_TT
,
713 "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n",
714 unicast_packet
->dest
,
716 /* at this point the mesh destination should have been
717 * substituted with the originator address found in the global
718 * table. If not, let the packet go untouched anyway because
719 * there is nothing the node can do
724 /* retrieve the TTVN known by this node for the packet destination. This
725 * value is used later to check if the node which sent (or re-routed
726 * last time) the packet had an updated information or not
728 curr_ttvn
= (uint8_t)atomic_read(&bat_priv
->tt
.vn
);
729 if (!batadv_is_my_mac(bat_priv
, unicast_packet
->dest
)) {
730 orig_node
= batadv_orig_hash_find(bat_priv
,
731 unicast_packet
->dest
);
732 /* if it is not possible to find the orig_node representing the
733 * destination, the packet can immediately be dropped as it will
734 * not be possible to deliver it
739 curr_ttvn
= (uint8_t)atomic_read(&orig_node
->last_ttvn
);
740 batadv_orig_node_free_ref(orig_node
);
743 /* check if the TTVN contained in the packet is fresher than what the
746 is_old_ttvn
= batadv_seq_before(unicast_packet
->ttvn
, curr_ttvn
);
750 old_ttvn
= unicast_packet
->ttvn
;
751 /* the packet was forged based on outdated network information. Its
752 * destination can possibly be updated and forwarded towards the new
755 if (batadv_reroute_unicast_packet(bat_priv
, unicast_packet
,
756 ethhdr
->h_dest
, vid
)) {
757 batadv_dbg_ratelimited(BATADV_DBG_TT
, bat_priv
,
758 "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n",
759 unicast_packet
->dest
, ethhdr
->h_dest
,
760 old_ttvn
, curr_ttvn
);
764 /* the packet has not been re-routed: either the destination is
765 * currently served by this node or there is no destination at all and
766 * it is possible to drop the packet
768 if (!batadv_is_my_client(bat_priv
, ethhdr
->h_dest
, vid
))
771 /* update the header in order to let the packet be delivered to this
772 * node's soft interface
774 primary_if
= batadv_primary_if_get_selected(bat_priv
);
778 ether_addr_copy(unicast_packet
->dest
, primary_if
->net_dev
->dev_addr
);
780 batadv_hardif_free_ref(primary_if
);
782 unicast_packet
->ttvn
= curr_ttvn
;
788 * batadv_recv_unhandled_unicast_packet - receive and process packets which
789 * are in the unicast number space but not yet known to the implementation
790 * @skb: unicast tvlv packet to process
791 * @recv_if: pointer to interface this packet was received on
793 * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
796 int batadv_recv_unhandled_unicast_packet(struct sk_buff
*skb
,
797 struct batadv_hard_iface
*recv_if
)
799 struct batadv_unicast_packet
*unicast_packet
;
800 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
801 int check
, hdr_size
= sizeof(*unicast_packet
);
803 check
= batadv_check_unicast_packet(bat_priv
, skb
, hdr_size
);
807 /* we don't know about this type, drop it. */
808 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
809 if (batadv_is_my_mac(bat_priv
, unicast_packet
->dest
))
812 return batadv_route_unicast_packet(skb
, recv_if
);
815 int batadv_recv_unicast_packet(struct sk_buff
*skb
,
816 struct batadv_hard_iface
*recv_if
)
818 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
819 struct batadv_unicast_packet
*unicast_packet
;
820 struct batadv_unicast_4addr_packet
*unicast_4addr_packet
;
822 struct batadv_orig_node
*orig_node
= NULL
;
823 int check
, hdr_size
= sizeof(*unicast_packet
);
826 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
827 unicast_4addr_packet
= (struct batadv_unicast_4addr_packet
*)skb
->data
;
829 is4addr
= unicast_packet
->packet_type
== BATADV_UNICAST_4ADDR
;
830 /* the caller function should have already pulled 2 bytes */
832 hdr_size
= sizeof(*unicast_4addr_packet
);
834 /* function returns -EREMOTE for promiscuous packets */
835 check
= batadv_check_unicast_packet(bat_priv
, skb
, hdr_size
);
837 /* Even though the packet is not for us, we might save it to use for
838 * decoding a later received coded packet
840 if (check
== -EREMOTE
)
841 batadv_nc_skb_store_sniffed_unicast(bat_priv
, skb
);
845 if (!batadv_check_unicast_ttvn(bat_priv
, skb
, hdr_size
))
849 if (batadv_is_my_mac(bat_priv
, unicast_packet
->dest
)) {
851 batadv_dat_inc_counter(bat_priv
,
852 unicast_4addr_packet
->subtype
);
853 orig_addr
= unicast_4addr_packet
->src
;
854 orig_node
= batadv_orig_hash_find(bat_priv
, orig_addr
);
857 if (batadv_dat_snoop_incoming_arp_request(bat_priv
, skb
,
860 if (batadv_dat_snoop_incoming_arp_reply(bat_priv
, skb
,
864 batadv_interface_rx(recv_if
->soft_iface
, skb
, recv_if
, hdr_size
,
869 batadv_orig_node_free_ref(orig_node
);
871 return NET_RX_SUCCESS
;
874 return batadv_route_unicast_packet(skb
, recv_if
);
878 * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets
879 * @skb: unicast tvlv packet to process
880 * @recv_if: pointer to interface this packet was received on
881 * @dst_addr: the payload destination
883 * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
886 int batadv_recv_unicast_tvlv(struct sk_buff
*skb
,
887 struct batadv_hard_iface
*recv_if
)
889 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
890 struct batadv_unicast_tvlv_packet
*unicast_tvlv_packet
;
891 unsigned char *tvlv_buff
;
892 uint16_t tvlv_buff_len
;
893 int hdr_size
= sizeof(*unicast_tvlv_packet
);
894 int ret
= NET_RX_DROP
;
896 if (batadv_check_unicast_packet(bat_priv
, skb
, hdr_size
) < 0)
899 /* the header is likely to be modified while forwarding */
900 if (skb_cow(skb
, hdr_size
) < 0)
903 /* packet needs to be linearized to access the tvlv content */
904 if (skb_linearize(skb
) < 0)
907 unicast_tvlv_packet
= (struct batadv_unicast_tvlv_packet
*)skb
->data
;
909 tvlv_buff
= (unsigned char *)(skb
->data
+ hdr_size
);
910 tvlv_buff_len
= ntohs(unicast_tvlv_packet
->tvlv_len
);
912 if (tvlv_buff_len
> skb
->len
- hdr_size
)
915 ret
= batadv_tvlv_containers_process(bat_priv
, false, NULL
,
916 unicast_tvlv_packet
->src
,
917 unicast_tvlv_packet
->dst
,
918 tvlv_buff
, tvlv_buff_len
);
920 if (ret
!= NET_RX_SUCCESS
)
921 ret
= batadv_route_unicast_packet(skb
, recv_if
);
929 * batadv_recv_frag_packet - process received fragment
930 * @skb: the received fragment
931 * @recv_if: interface that the skb is received on
933 * This function does one of the three following things: 1) Forward fragment, if
934 * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till
935 * lack further fragments; 3) Merge fragments, if we have all needed parts.
937 * Return NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise.
939 int batadv_recv_frag_packet(struct sk_buff
*skb
,
940 struct batadv_hard_iface
*recv_if
)
942 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
943 struct batadv_orig_node
*orig_node_src
= NULL
;
944 struct batadv_frag_packet
*frag_packet
;
945 int ret
= NET_RX_DROP
;
947 if (batadv_check_unicast_packet(bat_priv
, skb
,
948 sizeof(*frag_packet
)) < 0)
951 frag_packet
= (struct batadv_frag_packet
*)skb
->data
;
952 orig_node_src
= batadv_orig_hash_find(bat_priv
, frag_packet
->orig
);
956 /* Route the fragment if it is not for us and too big to be merged. */
957 if (!batadv_is_my_mac(bat_priv
, frag_packet
->dest
) &&
958 batadv_frag_skb_fwd(skb
, recv_if
, orig_node_src
)) {
959 ret
= NET_RX_SUCCESS
;
963 batadv_inc_counter(bat_priv
, BATADV_CNT_FRAG_RX
);
964 batadv_add_counter(bat_priv
, BATADV_CNT_FRAG_RX_BYTES
, skb
->len
);
966 /* Add fragment to buffer and merge if possible. */
967 if (!batadv_frag_skb_buffer(&skb
, orig_node_src
))
970 /* Deliver merged packet to the appropriate handler, if it was
974 batadv_batman_skb_recv(skb
, recv_if
->net_dev
,
975 &recv_if
->batman_adv_ptype
, NULL
);
977 ret
= NET_RX_SUCCESS
;
981 batadv_orig_node_free_ref(orig_node_src
);
986 int batadv_recv_bcast_packet(struct sk_buff
*skb
,
987 struct batadv_hard_iface
*recv_if
)
989 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
990 struct batadv_orig_node
*orig_node
= NULL
;
991 struct batadv_bcast_packet
*bcast_packet
;
992 struct ethhdr
*ethhdr
;
993 int hdr_size
= sizeof(*bcast_packet
);
994 int ret
= NET_RX_DROP
;
998 /* drop packet if it has not necessary minimum size */
999 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
1002 ethhdr
= eth_hdr(skb
);
1004 /* packet with broadcast indication but unicast recipient */
1005 if (!is_broadcast_ether_addr(ethhdr
->h_dest
))
1008 /* packet with broadcast sender address */
1009 if (is_broadcast_ether_addr(ethhdr
->h_source
))
1012 /* ignore broadcasts sent by myself */
1013 if (batadv_is_my_mac(bat_priv
, ethhdr
->h_source
))
1016 bcast_packet
= (struct batadv_bcast_packet
*)skb
->data
;
1018 /* ignore broadcasts originated by myself */
1019 if (batadv_is_my_mac(bat_priv
, bcast_packet
->orig
))
1022 if (bcast_packet
->ttl
< 2)
1025 orig_node
= batadv_orig_hash_find(bat_priv
, bcast_packet
->orig
);
1030 spin_lock_bh(&orig_node
->bcast_seqno_lock
);
1032 seqno
= ntohl(bcast_packet
->seqno
);
1033 /* check whether the packet is a duplicate */
1034 if (batadv_test_bit(orig_node
->bcast_bits
, orig_node
->last_bcast_seqno
,
1038 seq_diff
= seqno
- orig_node
->last_bcast_seqno
;
1040 /* check whether the packet is old and the host just restarted. */
1041 if (batadv_window_protected(bat_priv
, seq_diff
,
1042 &orig_node
->bcast_seqno_reset
))
1045 /* mark broadcast in flood history, update window position
1048 if (batadv_bit_get_packet(bat_priv
, orig_node
->bcast_bits
, seq_diff
, 1))
1049 orig_node
->last_bcast_seqno
= seqno
;
1051 spin_unlock_bh(&orig_node
->bcast_seqno_lock
);
1053 /* check whether this has been sent by another originator before */
1054 if (batadv_bla_check_bcast_duplist(bat_priv
, skb
))
1057 batadv_skb_set_priority(skb
, sizeof(struct batadv_bcast_packet
));
1059 /* rebroadcast packet */
1060 batadv_add_bcast_packet_to_list(bat_priv
, skb
, 1);
1062 /* don't hand the broadcast up if it is from an originator
1063 * from the same backbone.
1065 if (batadv_bla_is_backbone_gw(skb
, orig_node
, hdr_size
))
1068 if (batadv_dat_snoop_incoming_arp_request(bat_priv
, skb
, hdr_size
))
1070 if (batadv_dat_snoop_incoming_arp_reply(bat_priv
, skb
, hdr_size
))
1073 /* broadcast for me */
1074 batadv_interface_rx(recv_if
->soft_iface
, skb
, recv_if
, hdr_size
,
1078 ret
= NET_RX_SUCCESS
;
1082 spin_unlock_bh(&orig_node
->bcast_seqno_lock
);
1085 batadv_orig_node_free_ref(orig_node
);