1 /* Copyright (C) 2007-2016 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/kref.h>
29 #include <linux/netdevice.h>
30 #include <linux/printk.h>
31 #include <linux/rculist.h>
32 #include <linux/rcupdate.h>
33 #include <linux/skbuff.h>
34 #include <linux/spinlock.h>
35 #include <linux/stddef.h>
38 #include "bridge_loop_avoidance.h"
39 #include "distributed-arp-table.h"
40 #include "fragmentation.h"
41 #include "hard-interface.h"
42 #include "icmp_socket.h"
43 #include "network-coding.h"
44 #include "originator.h"
47 #include "soft-interface.h"
48 #include "translation-table.h"
50 static int batadv_route_unicast_packet(struct sk_buff
*skb
,
51 struct batadv_hard_iface
*recv_if
);
54 * _batadv_update_route - set the router for this originator
55 * @bat_priv: the bat priv with all the soft interface information
56 * @orig_node: orig node which is to be configured
57 * @recv_if: the receive interface for which this route is set
58 * @neigh_node: neighbor which should be the next router
60 * This function does not perform any error checks
62 static void _batadv_update_route(struct batadv_priv
*bat_priv
,
63 struct batadv_orig_node
*orig_node
,
64 struct batadv_hard_iface
*recv_if
,
65 struct batadv_neigh_node
*neigh_node
)
67 struct batadv_orig_ifinfo
*orig_ifinfo
;
68 struct batadv_neigh_node
*curr_router
;
70 orig_ifinfo
= batadv_orig_ifinfo_get(orig_node
, recv_if
);
75 curr_router
= rcu_dereference(orig_ifinfo
->router
);
76 if (curr_router
&& !kref_get_unless_zero(&curr_router
->refcount
))
81 if ((curr_router
) && (!neigh_node
)) {
82 batadv_dbg(BATADV_DBG_ROUTES
, bat_priv
,
83 "Deleting route towards: %pM\n", orig_node
->orig
);
84 batadv_tt_global_del_orig(bat_priv
, orig_node
, -1,
85 "Deleted route towards originator");
88 } else if ((!curr_router
) && (neigh_node
)) {
89 batadv_dbg(BATADV_DBG_ROUTES
, bat_priv
,
90 "Adding route towards: %pM (via %pM)\n",
91 orig_node
->orig
, neigh_node
->addr
);
93 } else if (neigh_node
&& curr_router
) {
94 batadv_dbg(BATADV_DBG_ROUTES
, bat_priv
,
95 "Changing route towards: %pM (now via %pM - was via %pM)\n",
96 orig_node
->orig
, neigh_node
->addr
,
101 batadv_neigh_node_put(curr_router
);
103 spin_lock_bh(&orig_node
->neigh_list_lock
);
104 /* curr_router used earlier may not be the current orig_ifinfo->router
105 * anymore because it was dereferenced outside of the neigh_list_lock
106 * protected region. After the new best neighbor has replace the current
107 * best neighbor the reference counter needs to decrease. Consequently,
108 * the code needs to ensure the curr_router variable contains a pointer
109 * to the replaced best neighbor.
111 curr_router
= rcu_dereference_protected(orig_ifinfo
->router
, true);
113 /* increase refcount of new best neighbor */
115 kref_get(&neigh_node
->refcount
);
117 rcu_assign_pointer(orig_ifinfo
->router
, neigh_node
);
118 spin_unlock_bh(&orig_node
->neigh_list_lock
);
119 batadv_orig_ifinfo_put(orig_ifinfo
);
121 /* decrease refcount of previous best neighbor */
123 batadv_neigh_node_put(curr_router
);
127 * batadv_update_route - set the router for this originator
128 * @bat_priv: the bat priv with all the soft interface information
129 * @orig_node: orig node which is to be configured
130 * @recv_if: the receive interface for which this route is set
131 * @neigh_node: neighbor which should be the next router
133 void batadv_update_route(struct batadv_priv
*bat_priv
,
134 struct batadv_orig_node
*orig_node
,
135 struct batadv_hard_iface
*recv_if
,
136 struct batadv_neigh_node
*neigh_node
)
138 struct batadv_neigh_node
*router
= NULL
;
143 router
= batadv_orig_router_get(orig_node
, recv_if
);
145 if (router
!= neigh_node
)
146 _batadv_update_route(bat_priv
, orig_node
, recv_if
, neigh_node
);
150 batadv_neigh_node_put(router
);
154 * batadv_window_protected - checks whether the host restarted and is in the
156 * @bat_priv: the bat priv with all the soft interface information
157 * @seq_num_diff: difference between the current/received sequence number and
158 * the last sequence number
159 * @seq_old_max_diff: maximum age of sequence number not considered as restart
160 * @last_reset: jiffies timestamp of the last reset, will be updated when reset
162 * @protection_started: is set to true if the protection window was started,
163 * doesn't change otherwise.
166 * false if the packet is to be accepted.
167 * true if the packet is to be ignored.
169 bool batadv_window_protected(struct batadv_priv
*bat_priv
, s32 seq_num_diff
,
170 s32 seq_old_max_diff
, unsigned long *last_reset
,
171 bool *protection_started
)
173 if (seq_num_diff
<= -seq_old_max_diff
||
174 seq_num_diff
>= BATADV_EXPECTED_SEQNO_RANGE
) {
175 if (!batadv_has_timed_out(*last_reset
,
176 BATADV_RESET_PROTECTION_MS
))
179 *last_reset
= jiffies
;
180 if (protection_started
)
181 *protection_started
= true;
182 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
183 "old packet received, start protection\n");
189 bool batadv_check_management_packet(struct sk_buff
*skb
,
190 struct batadv_hard_iface
*hard_iface
,
193 struct ethhdr
*ethhdr
;
195 /* drop packet if it has not necessary minimum size */
196 if (unlikely(!pskb_may_pull(skb
, header_len
)))
199 ethhdr
= eth_hdr(skb
);
201 /* packet with broadcast indication but unicast recipient */
202 if (!is_broadcast_ether_addr(ethhdr
->h_dest
))
205 /* packet with broadcast sender address */
206 if (is_broadcast_ether_addr(ethhdr
->h_source
))
209 /* create a copy of the skb, if needed, to modify it. */
210 if (skb_cow(skb
, 0) < 0)
213 /* keep skb linear */
214 if (skb_linearize(skb
) < 0)
221 * batadv_recv_my_icmp_packet - receive an icmp packet locally
222 * @bat_priv: the bat priv with all the soft interface information
223 * @skb: icmp packet to process
225 * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
228 static int batadv_recv_my_icmp_packet(struct batadv_priv
*bat_priv
,
231 struct batadv_hard_iface
*primary_if
= NULL
;
232 struct batadv_orig_node
*orig_node
= NULL
;
233 struct batadv_icmp_header
*icmph
;
234 int res
, ret
= NET_RX_DROP
;
236 icmph
= (struct batadv_icmp_header
*)skb
->data
;
238 switch (icmph
->msg_type
) {
239 case BATADV_ECHO_REPLY
:
240 case BATADV_DESTINATION_UNREACHABLE
:
241 case BATADV_TTL_EXCEEDED
:
242 /* receive the packet */
243 if (skb_linearize(skb
) < 0)
246 batadv_socket_receive_packet(icmph
, skb
->len
);
248 case BATADV_ECHO_REQUEST
:
249 /* answer echo request (ping) */
250 primary_if
= batadv_primary_if_get_selected(bat_priv
);
254 /* get routing information */
255 orig_node
= batadv_orig_hash_find(bat_priv
, icmph
->orig
);
259 /* create a copy of the skb, if needed, to modify it. */
260 if (skb_cow(skb
, ETH_HLEN
) < 0)
263 icmph
= (struct batadv_icmp_header
*)skb
->data
;
265 ether_addr_copy(icmph
->dst
, icmph
->orig
);
266 ether_addr_copy(icmph
->orig
, primary_if
->net_dev
->dev_addr
);
267 icmph
->msg_type
= BATADV_ECHO_REPLY
;
268 icmph
->ttl
= BATADV_TTL
;
270 res
= batadv_send_skb_to_orig(skb
, orig_node
, NULL
);
271 if (res
!= NET_XMIT_DROP
)
272 ret
= NET_RX_SUCCESS
;
276 /* drop unknown type */
281 batadv_hardif_put(primary_if
);
283 batadv_orig_node_put(orig_node
);
287 static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv
*bat_priv
,
290 struct batadv_hard_iface
*primary_if
= NULL
;
291 struct batadv_orig_node
*orig_node
= NULL
;
292 struct batadv_icmp_packet
*icmp_packet
;
293 int ret
= NET_RX_DROP
;
295 icmp_packet
= (struct batadv_icmp_packet
*)skb
->data
;
297 /* send TTL exceeded if packet is an echo request (traceroute) */
298 if (icmp_packet
->msg_type
!= BATADV_ECHO_REQUEST
) {
299 pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n",
300 icmp_packet
->orig
, icmp_packet
->dst
);
304 primary_if
= batadv_primary_if_get_selected(bat_priv
);
308 /* get routing information */
309 orig_node
= batadv_orig_hash_find(bat_priv
, icmp_packet
->orig
);
313 /* create a copy of the skb, if needed, to modify it. */
314 if (skb_cow(skb
, ETH_HLEN
) < 0)
317 icmp_packet
= (struct batadv_icmp_packet
*)skb
->data
;
319 ether_addr_copy(icmp_packet
->dst
, icmp_packet
->orig
);
320 ether_addr_copy(icmp_packet
->orig
, primary_if
->net_dev
->dev_addr
);
321 icmp_packet
->msg_type
= BATADV_TTL_EXCEEDED
;
322 icmp_packet
->ttl
= BATADV_TTL
;
324 if (batadv_send_skb_to_orig(skb
, orig_node
, NULL
) != NET_XMIT_DROP
)
325 ret
= NET_RX_SUCCESS
;
329 batadv_hardif_put(primary_if
);
331 batadv_orig_node_put(orig_node
);
335 int batadv_recv_icmp_packet(struct sk_buff
*skb
,
336 struct batadv_hard_iface
*recv_if
)
338 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
339 struct batadv_icmp_header
*icmph
;
340 struct batadv_icmp_packet_rr
*icmp_packet_rr
;
341 struct ethhdr
*ethhdr
;
342 struct batadv_orig_node
*orig_node
= NULL
;
343 int hdr_size
= sizeof(struct batadv_icmp_header
);
344 int ret
= NET_RX_DROP
;
346 /* drop packet if it has not necessary minimum size */
347 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
350 ethhdr
= eth_hdr(skb
);
352 /* packet with unicast indication but broadcast recipient */
353 if (is_broadcast_ether_addr(ethhdr
->h_dest
))
356 /* packet with broadcast sender address */
357 if (is_broadcast_ether_addr(ethhdr
->h_source
))
361 if (!batadv_is_my_mac(bat_priv
, ethhdr
->h_dest
))
364 icmph
= (struct batadv_icmp_header
*)skb
->data
;
366 /* add record route information if not full */
367 if ((icmph
->msg_type
== BATADV_ECHO_REPLY
||
368 icmph
->msg_type
== BATADV_ECHO_REQUEST
) &&
369 (skb
->len
>= sizeof(struct batadv_icmp_packet_rr
))) {
370 if (skb_linearize(skb
) < 0)
373 /* create a copy of the skb, if needed, to modify it. */
374 if (skb_cow(skb
, ETH_HLEN
) < 0)
377 ethhdr
= eth_hdr(skb
);
378 icmph
= (struct batadv_icmp_header
*)skb
->data
;
379 icmp_packet_rr
= (struct batadv_icmp_packet_rr
*)icmph
;
380 if (icmp_packet_rr
->rr_cur
>= BATADV_RR_LEN
)
383 ether_addr_copy(icmp_packet_rr
->rr
[icmp_packet_rr
->rr_cur
],
385 icmp_packet_rr
->rr_cur
++;
389 if (batadv_is_my_mac(bat_priv
, icmph
->dst
))
390 return batadv_recv_my_icmp_packet(bat_priv
, skb
);
394 return batadv_recv_icmp_ttl_exceeded(bat_priv
, skb
);
396 /* get routing information */
397 orig_node
= batadv_orig_hash_find(bat_priv
, icmph
->dst
);
401 /* create a copy of the skb, if needed, to modify it. */
402 if (skb_cow(skb
, ETH_HLEN
) < 0)
405 icmph
= (struct batadv_icmp_header
*)skb
->data
;
411 if (batadv_send_skb_to_orig(skb
, orig_node
, recv_if
) != NET_XMIT_DROP
)
412 ret
= NET_RX_SUCCESS
;
416 batadv_orig_node_put(orig_node
);
421 * batadv_check_unicast_packet - Check for malformed unicast packets
422 * @bat_priv: the bat priv with all the soft interface information
423 * @skb: packet to check
424 * @hdr_size: size of header to pull
426 * Check for short header and bad addresses in given packet.
428 * Return: negative value when check fails and 0 otherwise. The negative value
429 * depends on the reason: -ENODATA for bad header, -EBADR for broadcast
430 * destination or source, and -EREMOTE for non-local (other host) destination.
432 static int batadv_check_unicast_packet(struct batadv_priv
*bat_priv
,
433 struct sk_buff
*skb
, int hdr_size
)
435 struct ethhdr
*ethhdr
;
437 /* drop packet if it has not necessary minimum size */
438 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
441 ethhdr
= eth_hdr(skb
);
443 /* packet with unicast indication but broadcast recipient */
444 if (is_broadcast_ether_addr(ethhdr
->h_dest
))
447 /* packet with broadcast sender address */
448 if (is_broadcast_ether_addr(ethhdr
->h_source
))
452 if (!batadv_is_my_mac(bat_priv
, ethhdr
->h_dest
))
459 * batadv_find_router - find a suitable router for this originator
460 * @bat_priv: the bat priv with all the soft interface information
461 * @orig_node: the destination node
462 * @recv_if: pointer to interface this packet was received on
464 * Return: the router which should be used for this orig_node on
465 * this interface, or NULL if not available.
467 struct batadv_neigh_node
*
468 batadv_find_router(struct batadv_priv
*bat_priv
,
469 struct batadv_orig_node
*orig_node
,
470 struct batadv_hard_iface
*recv_if
)
472 struct batadv_algo_ops
*bao
= bat_priv
->bat_algo_ops
;
473 struct batadv_neigh_node
*first_candidate_router
= NULL
;
474 struct batadv_neigh_node
*next_candidate_router
= NULL
;
475 struct batadv_neigh_node
*router
, *cand_router
= NULL
;
476 struct batadv_neigh_node
*last_cand_router
= NULL
;
477 struct batadv_orig_ifinfo
*cand
, *first_candidate
= NULL
;
478 struct batadv_orig_ifinfo
*next_candidate
= NULL
;
479 struct batadv_orig_ifinfo
*last_candidate
;
480 bool last_candidate_found
= false;
485 router
= batadv_orig_router_get(orig_node
, recv_if
);
490 /* only consider bonding for recv_if == BATADV_IF_DEFAULT (first hop)
493 if (!(recv_if
== BATADV_IF_DEFAULT
&& atomic_read(&bat_priv
->bonding
)))
496 /* bonding: loop through the list of possible routers found
497 * for the various outgoing interfaces and find a candidate after
498 * the last chosen bonding candidate (next_candidate). If no such
499 * router is found, use the first candidate found (the previously
500 * chosen bonding candidate might have been the last one in the list).
501 * If this can't be found either, return the previously chosen
502 * router - obviously there are no other candidates.
505 last_candidate
= orig_node
->last_bonding_candidate
;
507 last_cand_router
= rcu_dereference(last_candidate
->router
);
509 hlist_for_each_entry_rcu(cand
, &orig_node
->ifinfo_list
, list
) {
510 /* acquire some structures and references ... */
511 if (!kref_get_unless_zero(&cand
->refcount
))
514 cand_router
= rcu_dereference(cand
->router
);
518 if (!kref_get_unless_zero(&cand_router
->refcount
)) {
523 /* alternative candidate should be good enough to be
526 if (!bao
->bat_neigh_is_similar_or_better(cand_router
,
531 /* don't use the same router twice */
532 if (last_cand_router
== cand_router
)
535 /* mark the first possible candidate */
536 if (!first_candidate
) {
537 kref_get(&cand_router
->refcount
);
538 kref_get(&cand
->refcount
);
539 first_candidate
= cand
;
540 first_candidate_router
= cand_router
;
543 /* check if the loop has already passed the previously selected
544 * candidate ... this function should select the next candidate
545 * AFTER the previously used bonding candidate.
547 if (!last_candidate
|| last_candidate_found
) {
548 next_candidate
= cand
;
549 next_candidate_router
= cand_router
;
553 if (last_candidate
== cand
)
554 last_candidate_found
= true;
556 /* free references */
558 batadv_neigh_node_put(cand_router
);
561 batadv_orig_ifinfo_put(cand
);
565 /* last_bonding_candidate is reset below, remove the old reference. */
566 if (orig_node
->last_bonding_candidate
)
567 batadv_orig_ifinfo_put(orig_node
->last_bonding_candidate
);
569 /* After finding candidates, handle the three cases:
570 * 1) there is a next candidate, use that
571 * 2) there is no next candidate, use the first of the list
572 * 3) there is no candidate at all, return the default router
574 if (next_candidate
) {
575 batadv_neigh_node_put(router
);
577 /* remove references to first candidate, we don't need it. */
578 if (first_candidate
) {
579 batadv_neigh_node_put(first_candidate_router
);
580 batadv_orig_ifinfo_put(first_candidate
);
582 router
= next_candidate_router
;
583 orig_node
->last_bonding_candidate
= next_candidate
;
584 } else if (first_candidate
) {
585 batadv_neigh_node_put(router
);
587 /* refcounting has already been done in the loop above. */
588 router
= first_candidate_router
;
589 orig_node
->last_bonding_candidate
= first_candidate
;
591 orig_node
->last_bonding_candidate
= NULL
;
597 static int batadv_route_unicast_packet(struct sk_buff
*skb
,
598 struct batadv_hard_iface
*recv_if
)
600 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
601 struct batadv_orig_node
*orig_node
= NULL
;
602 struct batadv_unicast_packet
*unicast_packet
;
603 struct ethhdr
*ethhdr
= eth_hdr(skb
);
604 int res
, hdr_len
, ret
= NET_RX_DROP
;
607 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
610 if (unicast_packet
->ttl
< 2) {
611 pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n",
612 ethhdr
->h_source
, unicast_packet
->dest
);
616 /* get routing information */
617 orig_node
= batadv_orig_hash_find(bat_priv
, unicast_packet
->dest
);
622 /* create a copy of the skb, if needed, to modify it. */
623 if (skb_cow(skb
, ETH_HLEN
) < 0)
627 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
628 unicast_packet
->ttl
--;
630 switch (unicast_packet
->packet_type
) {
631 case BATADV_UNICAST_4ADDR
:
632 hdr_len
= sizeof(struct batadv_unicast_4addr_packet
);
635 hdr_len
= sizeof(struct batadv_unicast_packet
);
638 /* other packet types not supported - yet */
644 batadv_skb_set_priority(skb
, hdr_len
);
647 res
= batadv_send_skb_to_orig(skb
, orig_node
, recv_if
);
649 /* translate transmit result into receive result */
650 if (res
== NET_XMIT_SUCCESS
) {
651 /* skb was transmitted and consumed */
652 batadv_inc_counter(bat_priv
, BATADV_CNT_FORWARD
);
653 batadv_add_counter(bat_priv
, BATADV_CNT_FORWARD_BYTES
,
656 ret
= NET_RX_SUCCESS
;
657 } else if (res
== NET_XMIT_POLICED
) {
658 /* skb was buffered and consumed */
659 ret
= NET_RX_SUCCESS
;
664 batadv_orig_node_put(orig_node
);
669 * batadv_reroute_unicast_packet - update the unicast header for re-routing
670 * @bat_priv: the bat priv with all the soft interface information
671 * @unicast_packet: the unicast header to be updated
672 * @dst_addr: the payload destination
673 * @vid: VLAN identifier
675 * Search the translation table for dst_addr and update the unicast header with
676 * the new corresponding information (originator address where the destination
677 * client currently is and its known TTVN)
679 * Return: true if the packet header has been updated, false otherwise
682 batadv_reroute_unicast_packet(struct batadv_priv
*bat_priv
,
683 struct batadv_unicast_packet
*unicast_packet
,
684 u8
*dst_addr
, unsigned short vid
)
686 struct batadv_orig_node
*orig_node
= NULL
;
687 struct batadv_hard_iface
*primary_if
= NULL
;
689 u8
*orig_addr
, orig_ttvn
;
691 if (batadv_is_my_client(bat_priv
, dst_addr
, vid
)) {
692 primary_if
= batadv_primary_if_get_selected(bat_priv
);
695 orig_addr
= primary_if
->net_dev
->dev_addr
;
696 orig_ttvn
= (u8
)atomic_read(&bat_priv
->tt
.vn
);
698 orig_node
= batadv_transtable_search(bat_priv
, NULL
, dst_addr
,
703 if (batadv_compare_eth(orig_node
->orig
, unicast_packet
->dest
))
706 orig_addr
= orig_node
->orig
;
707 orig_ttvn
= (u8
)atomic_read(&orig_node
->last_ttvn
);
710 /* update the packet header */
711 ether_addr_copy(unicast_packet
->dest
, orig_addr
);
712 unicast_packet
->ttvn
= orig_ttvn
;
717 batadv_hardif_put(primary_if
);
719 batadv_orig_node_put(orig_node
);
724 static bool batadv_check_unicast_ttvn(struct batadv_priv
*bat_priv
,
725 struct sk_buff
*skb
, int hdr_len
)
727 struct batadv_unicast_packet
*unicast_packet
;
728 struct batadv_hard_iface
*primary_if
;
729 struct batadv_orig_node
*orig_node
;
730 u8 curr_ttvn
, old_ttvn
;
731 struct ethhdr
*ethhdr
;
735 /* check if there is enough data before accessing it */
736 if (!pskb_may_pull(skb
, hdr_len
+ ETH_HLEN
))
739 /* create a copy of the skb (in case of for re-routing) to modify it. */
740 if (skb_cow(skb
, sizeof(*unicast_packet
)) < 0)
743 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
744 vid
= batadv_get_vid(skb
, hdr_len
);
745 ethhdr
= (struct ethhdr
*)(skb
->data
+ hdr_len
);
747 /* check if the destination client was served by this node and it is now
748 * roaming. In this case, it means that the node has got a ROAM_ADV
749 * message and that it knows the new destination in the mesh to re-route
752 if (batadv_tt_local_client_is_roaming(bat_priv
, ethhdr
->h_dest
, vid
)) {
753 if (batadv_reroute_unicast_packet(bat_priv
, unicast_packet
,
754 ethhdr
->h_dest
, vid
))
755 batadv_dbg_ratelimited(BATADV_DBG_TT
,
757 "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n",
758 unicast_packet
->dest
,
760 /* at this point the mesh destination should have been
761 * substituted with the originator address found in the global
762 * table. If not, let the packet go untouched anyway because
763 * there is nothing the node can do
768 /* retrieve the TTVN known by this node for the packet destination. This
769 * value is used later to check if the node which sent (or re-routed
770 * last time) the packet had an updated information or not
772 curr_ttvn
= (u8
)atomic_read(&bat_priv
->tt
.vn
);
773 if (!batadv_is_my_mac(bat_priv
, unicast_packet
->dest
)) {
774 orig_node
= batadv_orig_hash_find(bat_priv
,
775 unicast_packet
->dest
);
776 /* if it is not possible to find the orig_node representing the
777 * destination, the packet can immediately be dropped as it will
778 * not be possible to deliver it
783 curr_ttvn
= (u8
)atomic_read(&orig_node
->last_ttvn
);
784 batadv_orig_node_put(orig_node
);
787 /* check if the TTVN contained in the packet is fresher than what the
790 is_old_ttvn
= batadv_seq_before(unicast_packet
->ttvn
, curr_ttvn
);
794 old_ttvn
= unicast_packet
->ttvn
;
795 /* the packet was forged based on outdated network information. Its
796 * destination can possibly be updated and forwarded towards the new
799 if (batadv_reroute_unicast_packet(bat_priv
, unicast_packet
,
800 ethhdr
->h_dest
, vid
)) {
801 batadv_dbg_ratelimited(BATADV_DBG_TT
, bat_priv
,
802 "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n",
803 unicast_packet
->dest
, ethhdr
->h_dest
,
804 old_ttvn
, curr_ttvn
);
808 /* the packet has not been re-routed: either the destination is
809 * currently served by this node or there is no destination at all and
810 * it is possible to drop the packet
812 if (!batadv_is_my_client(bat_priv
, ethhdr
->h_dest
, vid
))
815 /* update the header in order to let the packet be delivered to this
816 * node's soft interface
818 primary_if
= batadv_primary_if_get_selected(bat_priv
);
822 ether_addr_copy(unicast_packet
->dest
, primary_if
->net_dev
->dev_addr
);
824 batadv_hardif_put(primary_if
);
826 unicast_packet
->ttvn
= curr_ttvn
;
832 * batadv_recv_unhandled_unicast_packet - receive and process packets which
833 * are in the unicast number space but not yet known to the implementation
834 * @skb: unicast tvlv packet to process
835 * @recv_if: pointer to interface this packet was received on
837 * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
840 int batadv_recv_unhandled_unicast_packet(struct sk_buff
*skb
,
841 struct batadv_hard_iface
*recv_if
)
843 struct batadv_unicast_packet
*unicast_packet
;
844 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
845 int check
, hdr_size
= sizeof(*unicast_packet
);
847 check
= batadv_check_unicast_packet(bat_priv
, skb
, hdr_size
);
851 /* we don't know about this type, drop it. */
852 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
853 if (batadv_is_my_mac(bat_priv
, unicast_packet
->dest
))
856 return batadv_route_unicast_packet(skb
, recv_if
);
859 int batadv_recv_unicast_packet(struct sk_buff
*skb
,
860 struct batadv_hard_iface
*recv_if
)
862 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
863 struct batadv_unicast_packet
*unicast_packet
;
864 struct batadv_unicast_4addr_packet
*unicast_4addr_packet
;
866 struct batadv_orig_node
*orig_node
= NULL
;
867 int check
, hdr_size
= sizeof(*unicast_packet
);
868 enum batadv_subtype subtype
;
871 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
872 unicast_4addr_packet
= (struct batadv_unicast_4addr_packet
*)skb
->data
;
874 is4addr
= unicast_packet
->packet_type
== BATADV_UNICAST_4ADDR
;
875 /* the caller function should have already pulled 2 bytes */
877 hdr_size
= sizeof(*unicast_4addr_packet
);
879 /* function returns -EREMOTE for promiscuous packets */
880 check
= batadv_check_unicast_packet(bat_priv
, skb
, hdr_size
);
882 /* Even though the packet is not for us, we might save it to use for
883 * decoding a later received coded packet
885 if (check
== -EREMOTE
)
886 batadv_nc_skb_store_sniffed_unicast(bat_priv
, skb
);
890 if (!batadv_check_unicast_ttvn(bat_priv
, skb
, hdr_size
))
894 if (batadv_is_my_mac(bat_priv
, unicast_packet
->dest
)) {
896 subtype
= unicast_4addr_packet
->subtype
;
897 batadv_dat_inc_counter(bat_priv
, subtype
);
899 /* Only payload data should be considered for speedy
900 * join. For example, DAT also uses unicast 4addr
901 * types, but those packets should not be considered
902 * for speedy join, since the clients do not actually
903 * reside at the sending originator.
905 if (subtype
== BATADV_P_DATA
) {
906 orig_addr
= unicast_4addr_packet
->src
;
907 orig_node
= batadv_orig_hash_find(bat_priv
,
912 if (batadv_dat_snoop_incoming_arp_request(bat_priv
, skb
,
915 if (batadv_dat_snoop_incoming_arp_reply(bat_priv
, skb
,
919 batadv_interface_rx(recv_if
->soft_iface
, skb
, hdr_size
,
924 batadv_orig_node_put(orig_node
);
926 return NET_RX_SUCCESS
;
929 return batadv_route_unicast_packet(skb
, recv_if
);
933 * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets
934 * @skb: unicast tvlv packet to process
935 * @recv_if: pointer to interface this packet was received on
937 * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
940 int batadv_recv_unicast_tvlv(struct sk_buff
*skb
,
941 struct batadv_hard_iface
*recv_if
)
943 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
944 struct batadv_unicast_tvlv_packet
*unicast_tvlv_packet
;
945 unsigned char *tvlv_buff
;
947 int hdr_size
= sizeof(*unicast_tvlv_packet
);
948 int ret
= NET_RX_DROP
;
950 if (batadv_check_unicast_packet(bat_priv
, skb
, hdr_size
) < 0)
953 /* the header is likely to be modified while forwarding */
954 if (skb_cow(skb
, hdr_size
) < 0)
957 /* packet needs to be linearized to access the tvlv content */
958 if (skb_linearize(skb
) < 0)
961 unicast_tvlv_packet
= (struct batadv_unicast_tvlv_packet
*)skb
->data
;
963 tvlv_buff
= (unsigned char *)(skb
->data
+ hdr_size
);
964 tvlv_buff_len
= ntohs(unicast_tvlv_packet
->tvlv_len
);
966 if (tvlv_buff_len
> skb
->len
- hdr_size
)
969 ret
= batadv_tvlv_containers_process(bat_priv
, false, NULL
,
970 unicast_tvlv_packet
->src
,
971 unicast_tvlv_packet
->dst
,
972 tvlv_buff
, tvlv_buff_len
);
974 if (ret
!= NET_RX_SUCCESS
)
975 ret
= batadv_route_unicast_packet(skb
, recv_if
);
983 * batadv_recv_frag_packet - process received fragment
984 * @skb: the received fragment
985 * @recv_if: interface that the skb is received on
987 * This function does one of the three following things: 1) Forward fragment, if
988 * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till
989 * lack further fragments; 3) Merge fragments, if we have all needed parts.
991 * Return: NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise.
993 int batadv_recv_frag_packet(struct sk_buff
*skb
,
994 struct batadv_hard_iface
*recv_if
)
996 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
997 struct batadv_orig_node
*orig_node_src
= NULL
;
998 struct batadv_frag_packet
*frag_packet
;
999 int ret
= NET_RX_DROP
;
1001 if (batadv_check_unicast_packet(bat_priv
, skb
,
1002 sizeof(*frag_packet
)) < 0)
1005 frag_packet
= (struct batadv_frag_packet
*)skb
->data
;
1006 orig_node_src
= batadv_orig_hash_find(bat_priv
, frag_packet
->orig
);
1010 /* Route the fragment if it is not for us and too big to be merged. */
1011 if (!batadv_is_my_mac(bat_priv
, frag_packet
->dest
) &&
1012 batadv_frag_skb_fwd(skb
, recv_if
, orig_node_src
)) {
1013 ret
= NET_RX_SUCCESS
;
1017 batadv_inc_counter(bat_priv
, BATADV_CNT_FRAG_RX
);
1018 batadv_add_counter(bat_priv
, BATADV_CNT_FRAG_RX_BYTES
, skb
->len
);
1020 /* Add fragment to buffer and merge if possible. */
1021 if (!batadv_frag_skb_buffer(&skb
, orig_node_src
))
1024 /* Deliver merged packet to the appropriate handler, if it was
1028 batadv_batman_skb_recv(skb
, recv_if
->net_dev
,
1029 &recv_if
->batman_adv_ptype
, NULL
);
1031 ret
= NET_RX_SUCCESS
;
1035 batadv_orig_node_put(orig_node_src
);
1040 int batadv_recv_bcast_packet(struct sk_buff
*skb
,
1041 struct batadv_hard_iface
*recv_if
)
1043 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1044 struct batadv_orig_node
*orig_node
= NULL
;
1045 struct batadv_bcast_packet
*bcast_packet
;
1046 struct ethhdr
*ethhdr
;
1047 int hdr_size
= sizeof(*bcast_packet
);
1048 int ret
= NET_RX_DROP
;
1052 /* drop packet if it has not necessary minimum size */
1053 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
1056 ethhdr
= eth_hdr(skb
);
1058 /* packet with broadcast indication but unicast recipient */
1059 if (!is_broadcast_ether_addr(ethhdr
->h_dest
))
1062 /* packet with broadcast sender address */
1063 if (is_broadcast_ether_addr(ethhdr
->h_source
))
1066 /* ignore broadcasts sent by myself */
1067 if (batadv_is_my_mac(bat_priv
, ethhdr
->h_source
))
1070 bcast_packet
= (struct batadv_bcast_packet
*)skb
->data
;
1072 /* ignore broadcasts originated by myself */
1073 if (batadv_is_my_mac(bat_priv
, bcast_packet
->orig
))
1076 if (bcast_packet
->ttl
< 2)
1079 orig_node
= batadv_orig_hash_find(bat_priv
, bcast_packet
->orig
);
1084 spin_lock_bh(&orig_node
->bcast_seqno_lock
);
1086 seqno
= ntohl(bcast_packet
->seqno
);
1087 /* check whether the packet is a duplicate */
1088 if (batadv_test_bit(orig_node
->bcast_bits
, orig_node
->last_bcast_seqno
,
1092 seq_diff
= seqno
- orig_node
->last_bcast_seqno
;
1094 /* check whether the packet is old and the host just restarted. */
1095 if (batadv_window_protected(bat_priv
, seq_diff
,
1096 BATADV_BCAST_MAX_AGE
,
1097 &orig_node
->bcast_seqno_reset
, NULL
))
1100 /* mark broadcast in flood history, update window position
1103 if (batadv_bit_get_packet(bat_priv
, orig_node
->bcast_bits
, seq_diff
, 1))
1104 orig_node
->last_bcast_seqno
= seqno
;
1106 spin_unlock_bh(&orig_node
->bcast_seqno_lock
);
1108 /* check whether this has been sent by another originator before */
1109 if (batadv_bla_check_bcast_duplist(bat_priv
, skb
))
1112 batadv_skb_set_priority(skb
, sizeof(struct batadv_bcast_packet
));
1114 /* rebroadcast packet */
1115 batadv_add_bcast_packet_to_list(bat_priv
, skb
, 1);
1117 /* don't hand the broadcast up if it is from an originator
1118 * from the same backbone.
1120 if (batadv_bla_is_backbone_gw(skb
, orig_node
, hdr_size
))
1123 if (batadv_dat_snoop_incoming_arp_request(bat_priv
, skb
, hdr_size
))
1125 if (batadv_dat_snoop_incoming_arp_reply(bat_priv
, skb
, hdr_size
))
1128 /* broadcast for me */
1129 batadv_interface_rx(recv_if
->soft_iface
, skb
, hdr_size
, orig_node
);
1132 ret
= NET_RX_SUCCESS
;
1136 spin_unlock_bh(&orig_node
->bcast_seqno_lock
);
1139 batadv_orig_node_put(orig_node
);