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 /* increase refcount of new best neighbor */
104 if (neigh_node
&& !kref_get_unless_zero(&neigh_node
->refcount
))
107 spin_lock_bh(&orig_node
->neigh_list_lock
);
108 /* curr_router used earlier may not be the current orig_ifinfo->router
109 * anymore because it was dereferenced outside of the neigh_list_lock
110 * protected region. After the new best neighbor has replace the current
111 * best neighbor the reference counter needs to decrease. Consequently,
112 * the code needs to ensure the curr_router variable contains a pointer
113 * to the replaced best neighbor.
115 curr_router
= rcu_dereference_protected(orig_ifinfo
->router
, true);
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 * 0 if the packet is to be accepted.
167 * 1 if the packet is to be ignored.
169 int 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 icmph
= (struct batadv_icmp_header
*)skb
->data
;
378 icmp_packet_rr
= (struct batadv_icmp_packet_rr
*)icmph
;
379 if (icmp_packet_rr
->rr_cur
>= BATADV_RR_LEN
)
382 ether_addr_copy(icmp_packet_rr
->rr
[icmp_packet_rr
->rr_cur
],
384 icmp_packet_rr
->rr_cur
++;
388 if (batadv_is_my_mac(bat_priv
, icmph
->dst
))
389 return batadv_recv_my_icmp_packet(bat_priv
, skb
);
393 return batadv_recv_icmp_ttl_exceeded(bat_priv
, skb
);
395 /* get routing information */
396 orig_node
= batadv_orig_hash_find(bat_priv
, icmph
->dst
);
400 /* create a copy of the skb, if needed, to modify it. */
401 if (skb_cow(skb
, ETH_HLEN
) < 0)
404 icmph
= (struct batadv_icmp_header
*)skb
->data
;
410 if (batadv_send_skb_to_orig(skb
, orig_node
, recv_if
) != NET_XMIT_DROP
)
411 ret
= NET_RX_SUCCESS
;
415 batadv_orig_node_put(orig_node
);
420 * batadv_check_unicast_packet - Check for malformed unicast packets
421 * @bat_priv: the bat priv with all the soft interface information
422 * @skb: packet to check
423 * @hdr_size: size of header to pull
425 * Check for short header and bad addresses in given packet.
427 * Return: negative value when check fails and 0 otherwise. The negative value
428 * depends on the reason: -ENODATA for bad header, -EBADR for broadcast
429 * destination or source, and -EREMOTE for non-local (other host) destination.
431 static int batadv_check_unicast_packet(struct batadv_priv
*bat_priv
,
432 struct sk_buff
*skb
, int hdr_size
)
434 struct ethhdr
*ethhdr
;
436 /* drop packet if it has not necessary minimum size */
437 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
440 ethhdr
= eth_hdr(skb
);
442 /* packet with unicast indication but broadcast recipient */
443 if (is_broadcast_ether_addr(ethhdr
->h_dest
))
446 /* packet with broadcast sender address */
447 if (is_broadcast_ether_addr(ethhdr
->h_source
))
451 if (!batadv_is_my_mac(bat_priv
, ethhdr
->h_dest
))
458 * batadv_find_router - find a suitable router for this originator
459 * @bat_priv: the bat priv with all the soft interface information
460 * @orig_node: the destination node
461 * @recv_if: pointer to interface this packet was received on
463 * Return: the router which should be used for this orig_node on
464 * this interface, or NULL if not available.
466 struct batadv_neigh_node
*
467 batadv_find_router(struct batadv_priv
*bat_priv
,
468 struct batadv_orig_node
*orig_node
,
469 struct batadv_hard_iface
*recv_if
)
471 struct batadv_algo_ops
*bao
= bat_priv
->bat_algo_ops
;
472 struct batadv_neigh_node
*first_candidate_router
= NULL
;
473 struct batadv_neigh_node
*next_candidate_router
= NULL
;
474 struct batadv_neigh_node
*router
, *cand_router
= NULL
;
475 struct batadv_neigh_node
*last_cand_router
= NULL
;
476 struct batadv_orig_ifinfo
*cand
, *first_candidate
= NULL
;
477 struct batadv_orig_ifinfo
*next_candidate
= NULL
;
478 struct batadv_orig_ifinfo
*last_candidate
;
479 bool last_candidate_found
= false;
484 router
= batadv_orig_router_get(orig_node
, recv_if
);
489 /* only consider bonding for recv_if == BATADV_IF_DEFAULT (first hop)
492 if (!(recv_if
== BATADV_IF_DEFAULT
&& atomic_read(&bat_priv
->bonding
)))
495 /* bonding: loop through the list of possible routers found
496 * for the various outgoing interfaces and find a candidate after
497 * the last chosen bonding candidate (next_candidate). If no such
498 * router is found, use the first candidate found (the previously
499 * chosen bonding candidate might have been the last one in the list).
500 * If this can't be found either, return the previously chosen
501 * router - obviously there are no other candidates.
504 last_candidate
= orig_node
->last_bonding_candidate
;
506 last_cand_router
= rcu_dereference(last_candidate
->router
);
508 hlist_for_each_entry_rcu(cand
, &orig_node
->ifinfo_list
, list
) {
509 /* acquire some structures and references ... */
510 if (!kref_get_unless_zero(&cand
->refcount
))
513 cand_router
= rcu_dereference(cand
->router
);
517 if (!kref_get_unless_zero(&cand_router
->refcount
)) {
522 /* alternative candidate should be good enough to be
525 if (!bao
->bat_neigh_is_similar_or_better(cand_router
,
530 /* don't use the same router twice */
531 if (last_cand_router
== cand_router
)
534 /* mark the first possible candidate */
535 if (!first_candidate
) {
536 kref_get(&cand_router
->refcount
);
537 kref_get(&cand
->refcount
);
538 first_candidate
= cand
;
539 first_candidate_router
= cand_router
;
542 /* check if the loop has already passed the previously selected
543 * candidate ... this function should select the next candidate
544 * AFTER the previously used bonding candidate.
546 if (!last_candidate
|| last_candidate_found
) {
547 next_candidate
= cand
;
548 next_candidate_router
= cand_router
;
552 if (last_candidate
== cand
)
553 last_candidate_found
= true;
555 /* free references */
557 batadv_neigh_node_put(cand_router
);
560 batadv_orig_ifinfo_put(cand
);
564 /* last_bonding_candidate is reset below, remove the old reference. */
565 if (orig_node
->last_bonding_candidate
)
566 batadv_orig_ifinfo_put(orig_node
->last_bonding_candidate
);
568 /* After finding candidates, handle the three cases:
569 * 1) there is a next candidate, use that
570 * 2) there is no next candidate, use the first of the list
571 * 3) there is no candidate at all, return the default router
573 if (next_candidate
) {
574 batadv_neigh_node_put(router
);
576 /* remove references to first candidate, we don't need it. */
577 if (first_candidate
) {
578 batadv_neigh_node_put(first_candidate_router
);
579 batadv_orig_ifinfo_put(first_candidate
);
581 router
= next_candidate_router
;
582 orig_node
->last_bonding_candidate
= next_candidate
;
583 } else if (first_candidate
) {
584 batadv_neigh_node_put(router
);
586 /* refcounting has already been done in the loop above. */
587 router
= first_candidate_router
;
588 orig_node
->last_bonding_candidate
= first_candidate
;
590 orig_node
->last_bonding_candidate
= NULL
;
596 static int batadv_route_unicast_packet(struct sk_buff
*skb
,
597 struct batadv_hard_iface
*recv_if
)
599 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
600 struct batadv_orig_node
*orig_node
= NULL
;
601 struct batadv_unicast_packet
*unicast_packet
;
602 struct ethhdr
*ethhdr
= eth_hdr(skb
);
603 int res
, hdr_len
, ret
= NET_RX_DROP
;
605 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
608 if (unicast_packet
->ttl
< 2) {
609 pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n",
610 ethhdr
->h_source
, unicast_packet
->dest
);
614 /* get routing information */
615 orig_node
= batadv_orig_hash_find(bat_priv
, unicast_packet
->dest
);
620 /* create a copy of the skb, if needed, to modify it. */
621 if (skb_cow(skb
, ETH_HLEN
) < 0)
625 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
626 unicast_packet
->ttl
--;
628 switch (unicast_packet
->packet_type
) {
629 case BATADV_UNICAST_4ADDR
:
630 hdr_len
= sizeof(struct batadv_unicast_4addr_packet
);
633 hdr_len
= sizeof(struct batadv_unicast_packet
);
636 /* other packet types not supported - yet */
642 batadv_skb_set_priority(skb
, hdr_len
);
644 res
= batadv_send_skb_to_orig(skb
, orig_node
, recv_if
);
646 /* translate transmit result into receive result */
647 if (res
== NET_XMIT_SUCCESS
) {
648 /* skb was transmitted and consumed */
649 batadv_inc_counter(bat_priv
, BATADV_CNT_FORWARD
);
650 batadv_add_counter(bat_priv
, BATADV_CNT_FORWARD_BYTES
,
651 skb
->len
+ ETH_HLEN
);
653 ret
= NET_RX_SUCCESS
;
654 } else if (res
== NET_XMIT_POLICED
) {
655 /* skb was buffered and consumed */
656 ret
= NET_RX_SUCCESS
;
661 batadv_orig_node_put(orig_node
);
666 * batadv_reroute_unicast_packet - update the unicast header for re-routing
667 * @bat_priv: the bat priv with all the soft interface information
668 * @unicast_packet: the unicast header to be updated
669 * @dst_addr: the payload destination
670 * @vid: VLAN identifier
672 * Search the translation table for dst_addr and update the unicast header with
673 * the new corresponding information (originator address where the destination
674 * client currently is and its known TTVN)
676 * Return: true if the packet header has been updated, false otherwise
679 batadv_reroute_unicast_packet(struct batadv_priv
*bat_priv
,
680 struct batadv_unicast_packet
*unicast_packet
,
681 u8
*dst_addr
, unsigned short vid
)
683 struct batadv_orig_node
*orig_node
= NULL
;
684 struct batadv_hard_iface
*primary_if
= NULL
;
686 u8
*orig_addr
, orig_ttvn
;
688 if (batadv_is_my_client(bat_priv
, dst_addr
, vid
)) {
689 primary_if
= batadv_primary_if_get_selected(bat_priv
);
692 orig_addr
= primary_if
->net_dev
->dev_addr
;
693 orig_ttvn
= (u8
)atomic_read(&bat_priv
->tt
.vn
);
695 orig_node
= batadv_transtable_search(bat_priv
, NULL
, dst_addr
,
700 if (batadv_compare_eth(orig_node
->orig
, unicast_packet
->dest
))
703 orig_addr
= orig_node
->orig
;
704 orig_ttvn
= (u8
)atomic_read(&orig_node
->last_ttvn
);
707 /* update the packet header */
708 ether_addr_copy(unicast_packet
->dest
, orig_addr
);
709 unicast_packet
->ttvn
= orig_ttvn
;
714 batadv_hardif_put(primary_if
);
716 batadv_orig_node_put(orig_node
);
721 static int batadv_check_unicast_ttvn(struct batadv_priv
*bat_priv
,
722 struct sk_buff
*skb
, int hdr_len
) {
723 struct batadv_unicast_packet
*unicast_packet
;
724 struct batadv_hard_iface
*primary_if
;
725 struct batadv_orig_node
*orig_node
;
726 u8 curr_ttvn
, old_ttvn
;
727 struct ethhdr
*ethhdr
;
731 /* check if there is enough data before accessing it */
732 if (!pskb_may_pull(skb
, hdr_len
+ ETH_HLEN
))
735 /* create a copy of the skb (in case of for re-routing) to modify it. */
736 if (skb_cow(skb
, sizeof(*unicast_packet
)) < 0)
739 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
740 vid
= batadv_get_vid(skb
, hdr_len
);
741 ethhdr
= (struct ethhdr
*)(skb
->data
+ hdr_len
);
743 /* check if the destination client was served by this node and it is now
744 * roaming. In this case, it means that the node has got a ROAM_ADV
745 * message and that it knows the new destination in the mesh to re-route
748 if (batadv_tt_local_client_is_roaming(bat_priv
, ethhdr
->h_dest
, vid
)) {
749 if (batadv_reroute_unicast_packet(bat_priv
, unicast_packet
,
750 ethhdr
->h_dest
, vid
))
751 batadv_dbg_ratelimited(BATADV_DBG_TT
,
753 "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n",
754 unicast_packet
->dest
,
756 /* at this point the mesh destination should have been
757 * substituted with the originator address found in the global
758 * table. If not, let the packet go untouched anyway because
759 * there is nothing the node can do
764 /* retrieve the TTVN known by this node for the packet destination. This
765 * value is used later to check if the node which sent (or re-routed
766 * last time) the packet had an updated information or not
768 curr_ttvn
= (u8
)atomic_read(&bat_priv
->tt
.vn
);
769 if (!batadv_is_my_mac(bat_priv
, unicast_packet
->dest
)) {
770 orig_node
= batadv_orig_hash_find(bat_priv
,
771 unicast_packet
->dest
);
772 /* if it is not possible to find the orig_node representing the
773 * destination, the packet can immediately be dropped as it will
774 * not be possible to deliver it
779 curr_ttvn
= (u8
)atomic_read(&orig_node
->last_ttvn
);
780 batadv_orig_node_put(orig_node
);
783 /* check if the TTVN contained in the packet is fresher than what the
786 is_old_ttvn
= batadv_seq_before(unicast_packet
->ttvn
, curr_ttvn
);
790 old_ttvn
= unicast_packet
->ttvn
;
791 /* the packet was forged based on outdated network information. Its
792 * destination can possibly be updated and forwarded towards the new
795 if (batadv_reroute_unicast_packet(bat_priv
, unicast_packet
,
796 ethhdr
->h_dest
, vid
)) {
797 batadv_dbg_ratelimited(BATADV_DBG_TT
, bat_priv
,
798 "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n",
799 unicast_packet
->dest
, ethhdr
->h_dest
,
800 old_ttvn
, curr_ttvn
);
804 /* the packet has not been re-routed: either the destination is
805 * currently served by this node or there is no destination at all and
806 * it is possible to drop the packet
808 if (!batadv_is_my_client(bat_priv
, ethhdr
->h_dest
, vid
))
811 /* update the header in order to let the packet be delivered to this
812 * node's soft interface
814 primary_if
= batadv_primary_if_get_selected(bat_priv
);
818 ether_addr_copy(unicast_packet
->dest
, primary_if
->net_dev
->dev_addr
);
820 batadv_hardif_put(primary_if
);
822 unicast_packet
->ttvn
= curr_ttvn
;
828 * batadv_recv_unhandled_unicast_packet - receive and process packets which
829 * are in the unicast number space but not yet known to the implementation
830 * @skb: unicast tvlv packet to process
831 * @recv_if: pointer to interface this packet was received on
833 * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
836 int batadv_recv_unhandled_unicast_packet(struct sk_buff
*skb
,
837 struct batadv_hard_iface
*recv_if
)
839 struct batadv_unicast_packet
*unicast_packet
;
840 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
841 int check
, hdr_size
= sizeof(*unicast_packet
);
843 check
= batadv_check_unicast_packet(bat_priv
, skb
, hdr_size
);
847 /* we don't know about this type, drop it. */
848 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
849 if (batadv_is_my_mac(bat_priv
, unicast_packet
->dest
))
852 return batadv_route_unicast_packet(skb
, recv_if
);
855 int batadv_recv_unicast_packet(struct sk_buff
*skb
,
856 struct batadv_hard_iface
*recv_if
)
858 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
859 struct batadv_unicast_packet
*unicast_packet
;
860 struct batadv_unicast_4addr_packet
*unicast_4addr_packet
;
862 struct batadv_orig_node
*orig_node
= NULL
;
863 int check
, hdr_size
= sizeof(*unicast_packet
);
864 enum batadv_subtype subtype
;
867 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
868 unicast_4addr_packet
= (struct batadv_unicast_4addr_packet
*)skb
->data
;
870 is4addr
= unicast_packet
->packet_type
== BATADV_UNICAST_4ADDR
;
871 /* the caller function should have already pulled 2 bytes */
873 hdr_size
= sizeof(*unicast_4addr_packet
);
875 /* function returns -EREMOTE for promiscuous packets */
876 check
= batadv_check_unicast_packet(bat_priv
, skb
, hdr_size
);
878 /* Even though the packet is not for us, we might save it to use for
879 * decoding a later received coded packet
881 if (check
== -EREMOTE
)
882 batadv_nc_skb_store_sniffed_unicast(bat_priv
, skb
);
886 if (!batadv_check_unicast_ttvn(bat_priv
, skb
, hdr_size
))
890 if (batadv_is_my_mac(bat_priv
, unicast_packet
->dest
)) {
892 subtype
= unicast_4addr_packet
->subtype
;
893 batadv_dat_inc_counter(bat_priv
, subtype
);
895 /* Only payload data should be considered for speedy
896 * join. For example, DAT also uses unicast 4addr
897 * types, but those packets should not be considered
898 * for speedy join, since the clients do not actually
899 * reside at the sending originator.
901 if (subtype
== BATADV_P_DATA
) {
902 orig_addr
= unicast_4addr_packet
->src
;
903 orig_node
= batadv_orig_hash_find(bat_priv
,
908 if (batadv_dat_snoop_incoming_arp_request(bat_priv
, skb
,
911 if (batadv_dat_snoop_incoming_arp_reply(bat_priv
, skb
,
915 batadv_interface_rx(recv_if
->soft_iface
, skb
, recv_if
, hdr_size
,
920 batadv_orig_node_put(orig_node
);
922 return NET_RX_SUCCESS
;
925 return batadv_route_unicast_packet(skb
, recv_if
);
929 * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets
930 * @skb: unicast tvlv packet to process
931 * @recv_if: pointer to interface this packet was received on
933 * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
936 int batadv_recv_unicast_tvlv(struct sk_buff
*skb
,
937 struct batadv_hard_iface
*recv_if
)
939 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
940 struct batadv_unicast_tvlv_packet
*unicast_tvlv_packet
;
941 unsigned char *tvlv_buff
;
943 int hdr_size
= sizeof(*unicast_tvlv_packet
);
944 int ret
= NET_RX_DROP
;
946 if (batadv_check_unicast_packet(bat_priv
, skb
, hdr_size
) < 0)
949 /* the header is likely to be modified while forwarding */
950 if (skb_cow(skb
, hdr_size
) < 0)
953 /* packet needs to be linearized to access the tvlv content */
954 if (skb_linearize(skb
) < 0)
957 unicast_tvlv_packet
= (struct batadv_unicast_tvlv_packet
*)skb
->data
;
959 tvlv_buff
= (unsigned char *)(skb
->data
+ hdr_size
);
960 tvlv_buff_len
= ntohs(unicast_tvlv_packet
->tvlv_len
);
962 if (tvlv_buff_len
> skb
->len
- hdr_size
)
965 ret
= batadv_tvlv_containers_process(bat_priv
, false, NULL
,
966 unicast_tvlv_packet
->src
,
967 unicast_tvlv_packet
->dst
,
968 tvlv_buff
, tvlv_buff_len
);
970 if (ret
!= NET_RX_SUCCESS
)
971 ret
= batadv_route_unicast_packet(skb
, recv_if
);
979 * batadv_recv_frag_packet - process received fragment
980 * @skb: the received fragment
981 * @recv_if: interface that the skb is received on
983 * This function does one of the three following things: 1) Forward fragment, if
984 * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till
985 * lack further fragments; 3) Merge fragments, if we have all needed parts.
987 * Return: NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise.
989 int batadv_recv_frag_packet(struct sk_buff
*skb
,
990 struct batadv_hard_iface
*recv_if
)
992 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
993 struct batadv_orig_node
*orig_node_src
= NULL
;
994 struct batadv_frag_packet
*frag_packet
;
995 int ret
= NET_RX_DROP
;
997 if (batadv_check_unicast_packet(bat_priv
, skb
,
998 sizeof(*frag_packet
)) < 0)
1001 frag_packet
= (struct batadv_frag_packet
*)skb
->data
;
1002 orig_node_src
= batadv_orig_hash_find(bat_priv
, frag_packet
->orig
);
1006 /* Route the fragment if it is not for us and too big to be merged. */
1007 if (!batadv_is_my_mac(bat_priv
, frag_packet
->dest
) &&
1008 batadv_frag_skb_fwd(skb
, recv_if
, orig_node_src
)) {
1009 ret
= NET_RX_SUCCESS
;
1013 batadv_inc_counter(bat_priv
, BATADV_CNT_FRAG_RX
);
1014 batadv_add_counter(bat_priv
, BATADV_CNT_FRAG_RX_BYTES
, skb
->len
);
1016 /* Add fragment to buffer and merge if possible. */
1017 if (!batadv_frag_skb_buffer(&skb
, orig_node_src
))
1020 /* Deliver merged packet to the appropriate handler, if it was
1024 batadv_batman_skb_recv(skb
, recv_if
->net_dev
,
1025 &recv_if
->batman_adv_ptype
, NULL
);
1027 ret
= NET_RX_SUCCESS
;
1031 batadv_orig_node_put(orig_node_src
);
1036 int batadv_recv_bcast_packet(struct sk_buff
*skb
,
1037 struct batadv_hard_iface
*recv_if
)
1039 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1040 struct batadv_orig_node
*orig_node
= NULL
;
1041 struct batadv_bcast_packet
*bcast_packet
;
1042 struct ethhdr
*ethhdr
;
1043 int hdr_size
= sizeof(*bcast_packet
);
1044 int ret
= NET_RX_DROP
;
1048 /* drop packet if it has not necessary minimum size */
1049 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
1052 ethhdr
= eth_hdr(skb
);
1054 /* packet with broadcast indication but unicast recipient */
1055 if (!is_broadcast_ether_addr(ethhdr
->h_dest
))
1058 /* packet with broadcast sender address */
1059 if (is_broadcast_ether_addr(ethhdr
->h_source
))
1062 /* ignore broadcasts sent by myself */
1063 if (batadv_is_my_mac(bat_priv
, ethhdr
->h_source
))
1066 bcast_packet
= (struct batadv_bcast_packet
*)skb
->data
;
1068 /* ignore broadcasts originated by myself */
1069 if (batadv_is_my_mac(bat_priv
, bcast_packet
->orig
))
1072 if (bcast_packet
->ttl
< 2)
1075 orig_node
= batadv_orig_hash_find(bat_priv
, bcast_packet
->orig
);
1080 spin_lock_bh(&orig_node
->bcast_seqno_lock
);
1082 seqno
= ntohl(bcast_packet
->seqno
);
1083 /* check whether the packet is a duplicate */
1084 if (batadv_test_bit(orig_node
->bcast_bits
, orig_node
->last_bcast_seqno
,
1088 seq_diff
= seqno
- orig_node
->last_bcast_seqno
;
1090 /* check whether the packet is old and the host just restarted. */
1091 if (batadv_window_protected(bat_priv
, seq_diff
,
1092 BATADV_BCAST_MAX_AGE
,
1093 &orig_node
->bcast_seqno_reset
, NULL
))
1096 /* mark broadcast in flood history, update window position
1099 if (batadv_bit_get_packet(bat_priv
, orig_node
->bcast_bits
, seq_diff
, 1))
1100 orig_node
->last_bcast_seqno
= seqno
;
1102 spin_unlock_bh(&orig_node
->bcast_seqno_lock
);
1104 /* check whether this has been sent by another originator before */
1105 if (batadv_bla_check_bcast_duplist(bat_priv
, skb
))
1108 batadv_skb_set_priority(skb
, sizeof(struct batadv_bcast_packet
));
1110 /* rebroadcast packet */
1111 batadv_add_bcast_packet_to_list(bat_priv
, skb
, 1);
1113 /* don't hand the broadcast up if it is from an originator
1114 * from the same backbone.
1116 if (batadv_bla_is_backbone_gw(skb
, orig_node
, hdr_size
))
1119 if (batadv_dat_snoop_incoming_arp_request(bat_priv
, skb
, hdr_size
))
1121 if (batadv_dat_snoop_incoming_arp_reply(bat_priv
, skb
, hdr_size
))
1124 /* broadcast for me */
1125 batadv_interface_rx(recv_if
->soft_iface
, skb
, recv_if
, hdr_size
,
1129 ret
= NET_RX_SUCCESS
;
1133 spin_unlock_bh(&orig_node
->bcast_seqno_lock
);
1136 batadv_orig_node_put(orig_node
);