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"
44 #include "network-coding.h"
45 #include "originator.h"
48 #include "soft-interface.h"
50 #include "translation-table.h"
53 static int batadv_route_unicast_packet(struct sk_buff
*skb
,
54 struct batadv_hard_iface
*recv_if
);
57 * _batadv_update_route - set the router for this originator
58 * @bat_priv: the bat priv with all the soft interface information
59 * @orig_node: orig node which is to be configured
60 * @recv_if: the receive interface for which this route is set
61 * @neigh_node: neighbor which should be the next router
63 * This function does not perform any error checks
65 static void _batadv_update_route(struct batadv_priv
*bat_priv
,
66 struct batadv_orig_node
*orig_node
,
67 struct batadv_hard_iface
*recv_if
,
68 struct batadv_neigh_node
*neigh_node
)
70 struct batadv_orig_ifinfo
*orig_ifinfo
;
71 struct batadv_neigh_node
*curr_router
;
73 orig_ifinfo
= batadv_orig_ifinfo_get(orig_node
, recv_if
);
78 curr_router
= rcu_dereference(orig_ifinfo
->router
);
79 if (curr_router
&& !kref_get_unless_zero(&curr_router
->refcount
))
84 if ((curr_router
) && (!neigh_node
)) {
85 batadv_dbg(BATADV_DBG_ROUTES
, bat_priv
,
86 "Deleting route towards: %pM\n", orig_node
->orig
);
87 batadv_tt_global_del_orig(bat_priv
, orig_node
, -1,
88 "Deleted route towards originator");
91 } else if ((!curr_router
) && (neigh_node
)) {
92 batadv_dbg(BATADV_DBG_ROUTES
, bat_priv
,
93 "Adding route towards: %pM (via %pM)\n",
94 orig_node
->orig
, neigh_node
->addr
);
96 } else if (neigh_node
&& curr_router
) {
97 batadv_dbg(BATADV_DBG_ROUTES
, bat_priv
,
98 "Changing route towards: %pM (now via %pM - was via %pM)\n",
99 orig_node
->orig
, neigh_node
->addr
,
104 batadv_neigh_node_put(curr_router
);
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 /* increase refcount of new best neighbor */
118 kref_get(&neigh_node
->refcount
);
120 rcu_assign_pointer(orig_ifinfo
->router
, neigh_node
);
121 spin_unlock_bh(&orig_node
->neigh_list_lock
);
122 batadv_orig_ifinfo_put(orig_ifinfo
);
124 /* decrease refcount of previous best neighbor */
126 batadv_neigh_node_put(curr_router
);
130 * batadv_update_route - set the router for this originator
131 * @bat_priv: the bat priv with all the soft interface information
132 * @orig_node: orig node which is to be configured
133 * @recv_if: the receive interface for which this route is set
134 * @neigh_node: neighbor which should be the next router
136 void batadv_update_route(struct batadv_priv
*bat_priv
,
137 struct batadv_orig_node
*orig_node
,
138 struct batadv_hard_iface
*recv_if
,
139 struct batadv_neigh_node
*neigh_node
)
141 struct batadv_neigh_node
*router
= NULL
;
146 router
= batadv_orig_router_get(orig_node
, recv_if
);
148 if (router
!= neigh_node
)
149 _batadv_update_route(bat_priv
, orig_node
, recv_if
, neigh_node
);
153 batadv_neigh_node_put(router
);
157 * batadv_window_protected - checks whether the host restarted and is in the
159 * @bat_priv: the bat priv with all the soft interface information
160 * @seq_num_diff: difference between the current/received sequence number and
161 * the last sequence number
162 * @seq_old_max_diff: maximum age of sequence number not considered as restart
163 * @last_reset: jiffies timestamp of the last reset, will be updated when reset
165 * @protection_started: is set to true if the protection window was started,
166 * doesn't change otherwise.
169 * false if the packet is to be accepted.
170 * true if the packet is to be ignored.
172 bool batadv_window_protected(struct batadv_priv
*bat_priv
, s32 seq_num_diff
,
173 s32 seq_old_max_diff
, unsigned long *last_reset
,
174 bool *protection_started
)
176 if (seq_num_diff
<= -seq_old_max_diff
||
177 seq_num_diff
>= BATADV_EXPECTED_SEQNO_RANGE
) {
178 if (!batadv_has_timed_out(*last_reset
,
179 BATADV_RESET_PROTECTION_MS
))
182 *last_reset
= jiffies
;
183 if (protection_started
)
184 *protection_started
= true;
185 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
186 "old packet received, start protection\n");
192 bool batadv_check_management_packet(struct sk_buff
*skb
,
193 struct batadv_hard_iface
*hard_iface
,
196 struct ethhdr
*ethhdr
;
198 /* drop packet if it has not necessary minimum size */
199 if (unlikely(!pskb_may_pull(skb
, header_len
)))
202 ethhdr
= eth_hdr(skb
);
204 /* packet with broadcast indication but unicast recipient */
205 if (!is_broadcast_ether_addr(ethhdr
->h_dest
))
208 /* packet with broadcast sender address */
209 if (is_broadcast_ether_addr(ethhdr
->h_source
))
212 /* create a copy of the skb, if needed, to modify it. */
213 if (skb_cow(skb
, 0) < 0)
216 /* keep skb linear */
217 if (skb_linearize(skb
) < 0)
224 * batadv_recv_my_icmp_packet - receive an icmp packet locally
225 * @bat_priv: the bat priv with all the soft interface information
226 * @skb: icmp packet to process
228 * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
231 static int batadv_recv_my_icmp_packet(struct batadv_priv
*bat_priv
,
234 struct batadv_hard_iface
*primary_if
= NULL
;
235 struct batadv_orig_node
*orig_node
= NULL
;
236 struct batadv_icmp_header
*icmph
;
237 int res
, ret
= NET_RX_DROP
;
239 icmph
= (struct batadv_icmp_header
*)skb
->data
;
241 switch (icmph
->msg_type
) {
242 case BATADV_ECHO_REPLY
:
243 case BATADV_DESTINATION_UNREACHABLE
:
244 case BATADV_TTL_EXCEEDED
:
245 /* receive the packet */
246 if (skb_linearize(skb
) < 0)
249 batadv_socket_receive_packet(icmph
, skb
->len
);
251 case BATADV_ECHO_REQUEST
:
252 /* answer echo request (ping) */
253 primary_if
= batadv_primary_if_get_selected(bat_priv
);
257 /* get routing information */
258 orig_node
= batadv_orig_hash_find(bat_priv
, icmph
->orig
);
262 /* create a copy of the skb, if needed, to modify it. */
263 if (skb_cow(skb
, ETH_HLEN
) < 0)
266 icmph
= (struct batadv_icmp_header
*)skb
->data
;
268 ether_addr_copy(icmph
->dst
, icmph
->orig
);
269 ether_addr_copy(icmph
->orig
, primary_if
->net_dev
->dev_addr
);
270 icmph
->msg_type
= BATADV_ECHO_REPLY
;
271 icmph
->ttl
= BATADV_TTL
;
273 res
= batadv_send_skb_to_orig(skb
, orig_node
, NULL
);
277 ret
= NET_RX_SUCCESS
;
281 if (!pskb_may_pull(skb
, sizeof(struct batadv_icmp_tp_packet
)))
284 batadv_tp_meter_recv(bat_priv
, skb
);
285 ret
= NET_RX_SUCCESS
;
288 /* drop unknown type */
293 batadv_hardif_put(primary_if
);
295 batadv_orig_node_put(orig_node
);
299 static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv
*bat_priv
,
302 struct batadv_hard_iface
*primary_if
= NULL
;
303 struct batadv_orig_node
*orig_node
= NULL
;
304 struct batadv_icmp_packet
*icmp_packet
;
305 int res
, ret
= NET_RX_DROP
;
307 icmp_packet
= (struct batadv_icmp_packet
*)skb
->data
;
309 /* send TTL exceeded if packet is an echo request (traceroute) */
310 if (icmp_packet
->msg_type
!= BATADV_ECHO_REQUEST
) {
311 pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n",
312 icmp_packet
->orig
, icmp_packet
->dst
);
316 primary_if
= batadv_primary_if_get_selected(bat_priv
);
320 /* get routing information */
321 orig_node
= batadv_orig_hash_find(bat_priv
, icmp_packet
->orig
);
325 /* create a copy of the skb, if needed, to modify it. */
326 if (skb_cow(skb
, ETH_HLEN
) < 0)
329 icmp_packet
= (struct batadv_icmp_packet
*)skb
->data
;
331 ether_addr_copy(icmp_packet
->dst
, icmp_packet
->orig
);
332 ether_addr_copy(icmp_packet
->orig
, primary_if
->net_dev
->dev_addr
);
333 icmp_packet
->msg_type
= BATADV_TTL_EXCEEDED
;
334 icmp_packet
->ttl
= BATADV_TTL
;
336 res
= batadv_send_skb_to_orig(skb
, orig_node
, NULL
);
338 ret
= NET_RX_SUCCESS
;
342 batadv_hardif_put(primary_if
);
344 batadv_orig_node_put(orig_node
);
348 int batadv_recv_icmp_packet(struct sk_buff
*skb
,
349 struct batadv_hard_iface
*recv_if
)
351 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
352 struct batadv_icmp_header
*icmph
;
353 struct batadv_icmp_packet_rr
*icmp_packet_rr
;
354 struct ethhdr
*ethhdr
;
355 struct batadv_orig_node
*orig_node
= NULL
;
356 int hdr_size
= sizeof(struct batadv_icmp_header
);
357 int res
, ret
= NET_RX_DROP
;
359 /* drop packet if it has not necessary minimum size */
360 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
363 ethhdr
= eth_hdr(skb
);
365 /* packet with unicast indication but broadcast recipient */
366 if (is_broadcast_ether_addr(ethhdr
->h_dest
))
369 /* packet with broadcast sender address */
370 if (is_broadcast_ether_addr(ethhdr
->h_source
))
374 if (!batadv_is_my_mac(bat_priv
, ethhdr
->h_dest
))
377 icmph
= (struct batadv_icmp_header
*)skb
->data
;
379 /* add record route information if not full */
380 if ((icmph
->msg_type
== BATADV_ECHO_REPLY
||
381 icmph
->msg_type
== BATADV_ECHO_REQUEST
) &&
382 (skb
->len
>= sizeof(struct batadv_icmp_packet_rr
))) {
383 if (skb_linearize(skb
) < 0)
386 /* create a copy of the skb, if needed, to modify it. */
387 if (skb_cow(skb
, ETH_HLEN
) < 0)
390 ethhdr
= eth_hdr(skb
);
391 icmph
= (struct batadv_icmp_header
*)skb
->data
;
392 icmp_packet_rr
= (struct batadv_icmp_packet_rr
*)icmph
;
393 if (icmp_packet_rr
->rr_cur
>= BATADV_RR_LEN
)
396 ether_addr_copy(icmp_packet_rr
->rr
[icmp_packet_rr
->rr_cur
],
398 icmp_packet_rr
->rr_cur
++;
402 if (batadv_is_my_mac(bat_priv
, icmph
->dst
))
403 return batadv_recv_my_icmp_packet(bat_priv
, skb
);
407 return batadv_recv_icmp_ttl_exceeded(bat_priv
, skb
);
409 /* get routing information */
410 orig_node
= batadv_orig_hash_find(bat_priv
, icmph
->dst
);
414 /* create a copy of the skb, if needed, to modify it. */
415 if (skb_cow(skb
, ETH_HLEN
) < 0)
418 icmph
= (struct batadv_icmp_header
*)skb
->data
;
424 res
= batadv_send_skb_to_orig(skb
, orig_node
, recv_if
);
426 ret
= NET_RX_SUCCESS
;
430 batadv_orig_node_put(orig_node
);
435 * batadv_check_unicast_packet - Check for malformed unicast packets
436 * @bat_priv: the bat priv with all the soft interface information
437 * @skb: packet to check
438 * @hdr_size: size of header to pull
440 * Check for short header and bad addresses in given packet.
442 * Return: negative value when check fails and 0 otherwise. The negative value
443 * depends on the reason: -ENODATA for bad header, -EBADR for broadcast
444 * destination or source, and -EREMOTE for non-local (other host) destination.
446 static int batadv_check_unicast_packet(struct batadv_priv
*bat_priv
,
447 struct sk_buff
*skb
, int hdr_size
)
449 struct ethhdr
*ethhdr
;
451 /* drop packet if it has not necessary minimum size */
452 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
455 ethhdr
= eth_hdr(skb
);
457 /* packet with unicast indication but broadcast recipient */
458 if (is_broadcast_ether_addr(ethhdr
->h_dest
))
461 /* packet with broadcast sender address */
462 if (is_broadcast_ether_addr(ethhdr
->h_source
))
466 if (!batadv_is_my_mac(bat_priv
, ethhdr
->h_dest
))
473 * batadv_last_bonding_get - Get last_bonding_candidate of orig_node
474 * @orig_node: originator node whose last bonding candidate should be retrieved
476 * Return: last bonding candidate of router or NULL if not found
478 * The object is returned with refcounter increased by 1.
480 static struct batadv_orig_ifinfo
*
481 batadv_last_bonding_get(struct batadv_orig_node
*orig_node
)
483 struct batadv_orig_ifinfo
*last_bonding_candidate
;
485 spin_lock_bh(&orig_node
->neigh_list_lock
);
486 last_bonding_candidate
= orig_node
->last_bonding_candidate
;
488 if (last_bonding_candidate
)
489 kref_get(&last_bonding_candidate
->refcount
);
490 spin_unlock_bh(&orig_node
->neigh_list_lock
);
492 return last_bonding_candidate
;
496 * batadv_last_bonding_replace - Replace last_bonding_candidate of orig_node
497 * @orig_node: originator node whose bonding candidates should be replaced
498 * @new_candidate: new bonding candidate or NULL
501 batadv_last_bonding_replace(struct batadv_orig_node
*orig_node
,
502 struct batadv_orig_ifinfo
*new_candidate
)
504 struct batadv_orig_ifinfo
*old_candidate
;
506 spin_lock_bh(&orig_node
->neigh_list_lock
);
507 old_candidate
= orig_node
->last_bonding_candidate
;
510 kref_get(&new_candidate
->refcount
);
511 orig_node
->last_bonding_candidate
= new_candidate
;
512 spin_unlock_bh(&orig_node
->neigh_list_lock
);
515 batadv_orig_ifinfo_put(old_candidate
);
519 * batadv_find_router - find a suitable router for this originator
520 * @bat_priv: the bat priv with all the soft interface information
521 * @orig_node: the destination node
522 * @recv_if: pointer to interface this packet was received on
524 * Return: the router which should be used for this orig_node on
525 * this interface, or NULL if not available.
527 struct batadv_neigh_node
*
528 batadv_find_router(struct batadv_priv
*bat_priv
,
529 struct batadv_orig_node
*orig_node
,
530 struct batadv_hard_iface
*recv_if
)
532 struct batadv_algo_ops
*bao
= bat_priv
->algo_ops
;
533 struct batadv_neigh_node
*first_candidate_router
= NULL
;
534 struct batadv_neigh_node
*next_candidate_router
= NULL
;
535 struct batadv_neigh_node
*router
, *cand_router
= NULL
;
536 struct batadv_neigh_node
*last_cand_router
= NULL
;
537 struct batadv_orig_ifinfo
*cand
, *first_candidate
= NULL
;
538 struct batadv_orig_ifinfo
*next_candidate
= NULL
;
539 struct batadv_orig_ifinfo
*last_candidate
;
540 bool last_candidate_found
= false;
545 router
= batadv_orig_router_get(orig_node
, recv_if
);
550 /* only consider bonding for recv_if == BATADV_IF_DEFAULT (first hop)
553 if (!(recv_if
== BATADV_IF_DEFAULT
&& atomic_read(&bat_priv
->bonding
)))
556 /* bonding: loop through the list of possible routers found
557 * for the various outgoing interfaces and find a candidate after
558 * the last chosen bonding candidate (next_candidate). If no such
559 * router is found, use the first candidate found (the previously
560 * chosen bonding candidate might have been the last one in the list).
561 * If this can't be found either, return the previously chosen
562 * router - obviously there are no other candidates.
565 last_candidate
= batadv_last_bonding_get(orig_node
);
567 last_cand_router
= rcu_dereference(last_candidate
->router
);
569 hlist_for_each_entry_rcu(cand
, &orig_node
->ifinfo_list
, list
) {
570 /* acquire some structures and references ... */
571 if (!kref_get_unless_zero(&cand
->refcount
))
574 cand_router
= rcu_dereference(cand
->router
);
578 if (!kref_get_unless_zero(&cand_router
->refcount
)) {
583 /* alternative candidate should be good enough to be
586 if (!bao
->neigh
.is_similar_or_better(cand_router
,
587 cand
->if_outgoing
, router
,
591 /* don't use the same router twice */
592 if (last_cand_router
== cand_router
)
595 /* mark the first possible candidate */
596 if (!first_candidate
) {
597 kref_get(&cand_router
->refcount
);
598 kref_get(&cand
->refcount
);
599 first_candidate
= cand
;
600 first_candidate_router
= cand_router
;
603 /* check if the loop has already passed the previously selected
604 * candidate ... this function should select the next candidate
605 * AFTER the previously used bonding candidate.
607 if (!last_candidate
|| last_candidate_found
) {
608 next_candidate
= cand
;
609 next_candidate_router
= cand_router
;
613 if (last_candidate
== cand
)
614 last_candidate_found
= true;
616 /* free references */
618 batadv_neigh_node_put(cand_router
);
621 batadv_orig_ifinfo_put(cand
);
625 /* After finding candidates, handle the three cases:
626 * 1) there is a next candidate, use that
627 * 2) there is no next candidate, use the first of the list
628 * 3) there is no candidate at all, return the default router
630 if (next_candidate
) {
631 batadv_neigh_node_put(router
);
633 kref_get(&next_candidate_router
->refcount
);
634 router
= next_candidate_router
;
635 batadv_last_bonding_replace(orig_node
, next_candidate
);
636 } else if (first_candidate
) {
637 batadv_neigh_node_put(router
);
639 kref_get(&first_candidate_router
->refcount
);
640 router
= first_candidate_router
;
641 batadv_last_bonding_replace(orig_node
, first_candidate
);
643 batadv_last_bonding_replace(orig_node
, NULL
);
646 /* cleanup of candidates */
647 if (first_candidate
) {
648 batadv_neigh_node_put(first_candidate_router
);
649 batadv_orig_ifinfo_put(first_candidate
);
652 if (next_candidate
) {
653 batadv_neigh_node_put(next_candidate_router
);
654 batadv_orig_ifinfo_put(next_candidate
);
658 batadv_orig_ifinfo_put(last_candidate
);
663 static int batadv_route_unicast_packet(struct sk_buff
*skb
,
664 struct batadv_hard_iface
*recv_if
)
666 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
667 struct batadv_orig_node
*orig_node
= NULL
;
668 struct batadv_unicast_packet
*unicast_packet
;
669 struct ethhdr
*ethhdr
= eth_hdr(skb
);
670 int res
, hdr_len
, ret
= NET_RX_DROP
;
673 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
676 if (unicast_packet
->ttl
< 2) {
677 pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n",
678 ethhdr
->h_source
, unicast_packet
->dest
);
682 /* get routing information */
683 orig_node
= batadv_orig_hash_find(bat_priv
, unicast_packet
->dest
);
688 /* create a copy of the skb, if needed, to modify it. */
689 if (skb_cow(skb
, ETH_HLEN
) < 0)
693 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
694 unicast_packet
->ttl
--;
696 switch (unicast_packet
->packet_type
) {
697 case BATADV_UNICAST_4ADDR
:
698 hdr_len
= sizeof(struct batadv_unicast_4addr_packet
);
701 hdr_len
= sizeof(struct batadv_unicast_packet
);
704 /* other packet types not supported - yet */
710 batadv_skb_set_priority(skb
, hdr_len
);
713 res
= batadv_send_skb_to_orig(skb
, orig_node
, recv_if
);
717 /* translate transmit result into receive result */
718 if (res
== NET_XMIT_SUCCESS
) {
719 /* skb was transmitted and consumed */
720 batadv_inc_counter(bat_priv
, BATADV_CNT_FORWARD
);
721 batadv_add_counter(bat_priv
, BATADV_CNT_FORWARD_BYTES
,
725 ret
= NET_RX_SUCCESS
;
729 batadv_orig_node_put(orig_node
);
734 * batadv_reroute_unicast_packet - update the unicast header for re-routing
735 * @bat_priv: the bat priv with all the soft interface information
736 * @unicast_packet: the unicast header to be updated
737 * @dst_addr: the payload destination
738 * @vid: VLAN identifier
740 * Search the translation table for dst_addr and update the unicast header with
741 * the new corresponding information (originator address where the destination
742 * client currently is and its known TTVN)
744 * Return: true if the packet header has been updated, false otherwise
747 batadv_reroute_unicast_packet(struct batadv_priv
*bat_priv
,
748 struct batadv_unicast_packet
*unicast_packet
,
749 u8
*dst_addr
, unsigned short vid
)
751 struct batadv_orig_node
*orig_node
= NULL
;
752 struct batadv_hard_iface
*primary_if
= NULL
;
754 u8
*orig_addr
, orig_ttvn
;
756 if (batadv_is_my_client(bat_priv
, dst_addr
, vid
)) {
757 primary_if
= batadv_primary_if_get_selected(bat_priv
);
760 orig_addr
= primary_if
->net_dev
->dev_addr
;
761 orig_ttvn
= (u8
)atomic_read(&bat_priv
->tt
.vn
);
763 orig_node
= batadv_transtable_search(bat_priv
, NULL
, dst_addr
,
768 if (batadv_compare_eth(orig_node
->orig
, unicast_packet
->dest
))
771 orig_addr
= orig_node
->orig
;
772 orig_ttvn
= (u8
)atomic_read(&orig_node
->last_ttvn
);
775 /* update the packet header */
776 ether_addr_copy(unicast_packet
->dest
, orig_addr
);
777 unicast_packet
->ttvn
= orig_ttvn
;
782 batadv_hardif_put(primary_if
);
784 batadv_orig_node_put(orig_node
);
789 static bool batadv_check_unicast_ttvn(struct batadv_priv
*bat_priv
,
790 struct sk_buff
*skb
, int hdr_len
)
792 struct batadv_unicast_packet
*unicast_packet
;
793 struct batadv_hard_iface
*primary_if
;
794 struct batadv_orig_node
*orig_node
;
795 u8 curr_ttvn
, old_ttvn
;
796 struct ethhdr
*ethhdr
;
800 /* check if there is enough data before accessing it */
801 if (!pskb_may_pull(skb
, hdr_len
+ ETH_HLEN
))
804 /* create a copy of the skb (in case of for re-routing) to modify it. */
805 if (skb_cow(skb
, sizeof(*unicast_packet
)) < 0)
808 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
809 vid
= batadv_get_vid(skb
, hdr_len
);
810 ethhdr
= (struct ethhdr
*)(skb
->data
+ hdr_len
);
812 /* check if the destination client was served by this node and it is now
813 * roaming. In this case, it means that the node has got a ROAM_ADV
814 * message and that it knows the new destination in the mesh to re-route
817 if (batadv_tt_local_client_is_roaming(bat_priv
, ethhdr
->h_dest
, vid
)) {
818 if (batadv_reroute_unicast_packet(bat_priv
, unicast_packet
,
819 ethhdr
->h_dest
, vid
))
820 batadv_dbg_ratelimited(BATADV_DBG_TT
,
822 "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n",
823 unicast_packet
->dest
,
825 /* at this point the mesh destination should have been
826 * substituted with the originator address found in the global
827 * table. If not, let the packet go untouched anyway because
828 * there is nothing the node can do
833 /* retrieve the TTVN known by this node for the packet destination. This
834 * value is used later to check if the node which sent (or re-routed
835 * last time) the packet had an updated information or not
837 curr_ttvn
= (u8
)atomic_read(&bat_priv
->tt
.vn
);
838 if (!batadv_is_my_mac(bat_priv
, unicast_packet
->dest
)) {
839 orig_node
= batadv_orig_hash_find(bat_priv
,
840 unicast_packet
->dest
);
841 /* if it is not possible to find the orig_node representing the
842 * destination, the packet can immediately be dropped as it will
843 * not be possible to deliver it
848 curr_ttvn
= (u8
)atomic_read(&orig_node
->last_ttvn
);
849 batadv_orig_node_put(orig_node
);
852 /* check if the TTVN contained in the packet is fresher than what the
855 is_old_ttvn
= batadv_seq_before(unicast_packet
->ttvn
, curr_ttvn
);
859 old_ttvn
= unicast_packet
->ttvn
;
860 /* the packet was forged based on outdated network information. Its
861 * destination can possibly be updated and forwarded towards the new
864 if (batadv_reroute_unicast_packet(bat_priv
, unicast_packet
,
865 ethhdr
->h_dest
, vid
)) {
866 batadv_dbg_ratelimited(BATADV_DBG_TT
, bat_priv
,
867 "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n",
868 unicast_packet
->dest
, ethhdr
->h_dest
,
869 old_ttvn
, curr_ttvn
);
873 /* the packet has not been re-routed: either the destination is
874 * currently served by this node or there is no destination at all and
875 * it is possible to drop the packet
877 if (!batadv_is_my_client(bat_priv
, ethhdr
->h_dest
, vid
))
880 /* update the header in order to let the packet be delivered to this
881 * node's soft interface
883 primary_if
= batadv_primary_if_get_selected(bat_priv
);
887 ether_addr_copy(unicast_packet
->dest
, primary_if
->net_dev
->dev_addr
);
889 batadv_hardif_put(primary_if
);
891 unicast_packet
->ttvn
= curr_ttvn
;
897 * batadv_recv_unhandled_unicast_packet - receive and process packets which
898 * are in the unicast number space but not yet known to the implementation
899 * @skb: unicast tvlv packet to process
900 * @recv_if: pointer to interface this packet was received on
902 * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
905 int batadv_recv_unhandled_unicast_packet(struct sk_buff
*skb
,
906 struct batadv_hard_iface
*recv_if
)
908 struct batadv_unicast_packet
*unicast_packet
;
909 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
910 int check
, hdr_size
= sizeof(*unicast_packet
);
912 check
= batadv_check_unicast_packet(bat_priv
, skb
, hdr_size
);
916 /* we don't know about this type, drop it. */
917 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
918 if (batadv_is_my_mac(bat_priv
, unicast_packet
->dest
))
921 return batadv_route_unicast_packet(skb
, recv_if
);
924 int batadv_recv_unicast_packet(struct sk_buff
*skb
,
925 struct batadv_hard_iface
*recv_if
)
927 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
928 struct batadv_unicast_packet
*unicast_packet
;
929 struct batadv_unicast_4addr_packet
*unicast_4addr_packet
;
931 struct batadv_orig_node
*orig_node
= NULL
;
932 int check
, hdr_size
= sizeof(*unicast_packet
);
933 enum batadv_subtype subtype
;
936 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
937 unicast_4addr_packet
= (struct batadv_unicast_4addr_packet
*)skb
->data
;
939 is4addr
= unicast_packet
->packet_type
== BATADV_UNICAST_4ADDR
;
940 /* the caller function should have already pulled 2 bytes */
942 hdr_size
= sizeof(*unicast_4addr_packet
);
944 /* function returns -EREMOTE for promiscuous packets */
945 check
= batadv_check_unicast_packet(bat_priv
, skb
, hdr_size
);
947 /* Even though the packet is not for us, we might save it to use for
948 * decoding a later received coded packet
950 if (check
== -EREMOTE
)
951 batadv_nc_skb_store_sniffed_unicast(bat_priv
, skb
);
955 if (!batadv_check_unicast_ttvn(bat_priv
, skb
, hdr_size
))
959 if (batadv_is_my_mac(bat_priv
, unicast_packet
->dest
)) {
961 subtype
= unicast_4addr_packet
->subtype
;
962 batadv_dat_inc_counter(bat_priv
, subtype
);
964 /* Only payload data should be considered for speedy
965 * join. For example, DAT also uses unicast 4addr
966 * types, but those packets should not be considered
967 * for speedy join, since the clients do not actually
968 * reside at the sending originator.
970 if (subtype
== BATADV_P_DATA
) {
971 orig_addr
= unicast_4addr_packet
->src
;
972 orig_node
= batadv_orig_hash_find(bat_priv
,
977 if (batadv_dat_snoop_incoming_arp_request(bat_priv
, skb
,
980 if (batadv_dat_snoop_incoming_arp_reply(bat_priv
, skb
,
984 batadv_interface_rx(recv_if
->soft_iface
, skb
, hdr_size
,
989 batadv_orig_node_put(orig_node
);
991 return NET_RX_SUCCESS
;
994 return batadv_route_unicast_packet(skb
, recv_if
);
998 * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets
999 * @skb: unicast tvlv packet to process
1000 * @recv_if: pointer to interface this packet was received on
1002 * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
1005 int batadv_recv_unicast_tvlv(struct sk_buff
*skb
,
1006 struct batadv_hard_iface
*recv_if
)
1008 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1009 struct batadv_unicast_tvlv_packet
*unicast_tvlv_packet
;
1010 unsigned char *tvlv_buff
;
1012 int hdr_size
= sizeof(*unicast_tvlv_packet
);
1013 int ret
= NET_RX_DROP
;
1015 if (batadv_check_unicast_packet(bat_priv
, skb
, hdr_size
) < 0)
1018 /* the header is likely to be modified while forwarding */
1019 if (skb_cow(skb
, hdr_size
) < 0)
1022 /* packet needs to be linearized to access the tvlv content */
1023 if (skb_linearize(skb
) < 0)
1026 unicast_tvlv_packet
= (struct batadv_unicast_tvlv_packet
*)skb
->data
;
1028 tvlv_buff
= (unsigned char *)(skb
->data
+ hdr_size
);
1029 tvlv_buff_len
= ntohs(unicast_tvlv_packet
->tvlv_len
);
1031 if (tvlv_buff_len
> skb
->len
- hdr_size
)
1034 ret
= batadv_tvlv_containers_process(bat_priv
, false, NULL
,
1035 unicast_tvlv_packet
->src
,
1036 unicast_tvlv_packet
->dst
,
1037 tvlv_buff
, tvlv_buff_len
);
1039 if (ret
!= NET_RX_SUCCESS
)
1040 ret
= batadv_route_unicast_packet(skb
, recv_if
);
1048 * batadv_recv_frag_packet - process received fragment
1049 * @skb: the received fragment
1050 * @recv_if: interface that the skb is received on
1052 * This function does one of the three following things: 1) Forward fragment, if
1053 * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till
1054 * lack further fragments; 3) Merge fragments, if we have all needed parts.
1056 * Return: NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise.
1058 int batadv_recv_frag_packet(struct sk_buff
*skb
,
1059 struct batadv_hard_iface
*recv_if
)
1061 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1062 struct batadv_orig_node
*orig_node_src
= NULL
;
1063 struct batadv_frag_packet
*frag_packet
;
1064 int ret
= NET_RX_DROP
;
1066 if (batadv_check_unicast_packet(bat_priv
, skb
,
1067 sizeof(*frag_packet
)) < 0)
1070 frag_packet
= (struct batadv_frag_packet
*)skb
->data
;
1071 orig_node_src
= batadv_orig_hash_find(bat_priv
, frag_packet
->orig
);
1075 skb
->priority
= frag_packet
->priority
+ 256;
1077 /* Route the fragment if it is not for us and too big to be merged. */
1078 if (!batadv_is_my_mac(bat_priv
, frag_packet
->dest
) &&
1079 batadv_frag_skb_fwd(skb
, recv_if
, orig_node_src
)) {
1080 ret
= NET_RX_SUCCESS
;
1084 batadv_inc_counter(bat_priv
, BATADV_CNT_FRAG_RX
);
1085 batadv_add_counter(bat_priv
, BATADV_CNT_FRAG_RX_BYTES
, skb
->len
);
1087 /* Add fragment to buffer and merge if possible. */
1088 if (!batadv_frag_skb_buffer(&skb
, orig_node_src
))
1091 /* Deliver merged packet to the appropriate handler, if it was
1095 batadv_batman_skb_recv(skb
, recv_if
->net_dev
,
1096 &recv_if
->batman_adv_ptype
, NULL
);
1098 ret
= NET_RX_SUCCESS
;
1102 batadv_orig_node_put(orig_node_src
);
1107 int batadv_recv_bcast_packet(struct sk_buff
*skb
,
1108 struct batadv_hard_iface
*recv_if
)
1110 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1111 struct batadv_orig_node
*orig_node
= NULL
;
1112 struct batadv_bcast_packet
*bcast_packet
;
1113 struct ethhdr
*ethhdr
;
1114 int hdr_size
= sizeof(*bcast_packet
);
1115 int ret
= NET_RX_DROP
;
1119 /* drop packet if it has not necessary minimum size */
1120 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
1123 ethhdr
= eth_hdr(skb
);
1125 /* packet with broadcast indication but unicast recipient */
1126 if (!is_broadcast_ether_addr(ethhdr
->h_dest
))
1129 /* packet with broadcast sender address */
1130 if (is_broadcast_ether_addr(ethhdr
->h_source
))
1133 /* ignore broadcasts sent by myself */
1134 if (batadv_is_my_mac(bat_priv
, ethhdr
->h_source
))
1137 bcast_packet
= (struct batadv_bcast_packet
*)skb
->data
;
1139 /* ignore broadcasts originated by myself */
1140 if (batadv_is_my_mac(bat_priv
, bcast_packet
->orig
))
1143 if (bcast_packet
->ttl
< 2)
1146 orig_node
= batadv_orig_hash_find(bat_priv
, bcast_packet
->orig
);
1151 spin_lock_bh(&orig_node
->bcast_seqno_lock
);
1153 seqno
= ntohl(bcast_packet
->seqno
);
1154 /* check whether the packet is a duplicate */
1155 if (batadv_test_bit(orig_node
->bcast_bits
, orig_node
->last_bcast_seqno
,
1159 seq_diff
= seqno
- orig_node
->last_bcast_seqno
;
1161 /* check whether the packet is old and the host just restarted. */
1162 if (batadv_window_protected(bat_priv
, seq_diff
,
1163 BATADV_BCAST_MAX_AGE
,
1164 &orig_node
->bcast_seqno_reset
, NULL
))
1167 /* mark broadcast in flood history, update window position
1170 if (batadv_bit_get_packet(bat_priv
, orig_node
->bcast_bits
, seq_diff
, 1))
1171 orig_node
->last_bcast_seqno
= seqno
;
1173 spin_unlock_bh(&orig_node
->bcast_seqno_lock
);
1175 /* check whether this has been sent by another originator before */
1176 if (batadv_bla_check_bcast_duplist(bat_priv
, skb
))
1179 batadv_skb_set_priority(skb
, sizeof(struct batadv_bcast_packet
));
1181 /* rebroadcast packet */
1182 batadv_add_bcast_packet_to_list(bat_priv
, skb
, 1);
1184 /* don't hand the broadcast up if it is from an originator
1185 * from the same backbone.
1187 if (batadv_bla_is_backbone_gw(skb
, orig_node
, hdr_size
))
1190 if (batadv_dat_snoop_incoming_arp_request(bat_priv
, skb
, hdr_size
))
1192 if (batadv_dat_snoop_incoming_arp_reply(bat_priv
, skb
, hdr_size
))
1195 /* broadcast for me */
1196 batadv_interface_rx(recv_if
->soft_iface
, skb
, hdr_size
, orig_node
);
1199 ret
= NET_RX_SUCCESS
;
1203 spin_unlock_bh(&orig_node
->bcast_seqno_lock
);
1206 batadv_orig_node_put(orig_node
);