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>
39 #include "bridge_loop_avoidance.h"
40 #include "distributed-arp-table.h"
41 #include "fragmentation.h"
42 #include "hard-interface.h"
43 #include "icmp_socket.h"
45 #include "network-coding.h"
46 #include "originator.h"
49 #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
);
274 if (res
!= NET_XMIT_DROP
)
275 ret
= NET_RX_SUCCESS
;
279 /* drop unknown type */
284 batadv_hardif_put(primary_if
);
286 batadv_orig_node_put(orig_node
);
290 static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv
*bat_priv
,
293 struct batadv_hard_iface
*primary_if
= NULL
;
294 struct batadv_orig_node
*orig_node
= NULL
;
295 struct batadv_icmp_packet
*icmp_packet
;
296 int ret
= NET_RX_DROP
;
298 icmp_packet
= (struct batadv_icmp_packet
*)skb
->data
;
300 /* send TTL exceeded if packet is an echo request (traceroute) */
301 if (icmp_packet
->msg_type
!= BATADV_ECHO_REQUEST
) {
302 pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n",
303 icmp_packet
->orig
, icmp_packet
->dst
);
307 primary_if
= batadv_primary_if_get_selected(bat_priv
);
311 /* get routing information */
312 orig_node
= batadv_orig_hash_find(bat_priv
, icmp_packet
->orig
);
316 /* create a copy of the skb, if needed, to modify it. */
317 if (skb_cow(skb
, ETH_HLEN
) < 0)
320 icmp_packet
= (struct batadv_icmp_packet
*)skb
->data
;
322 ether_addr_copy(icmp_packet
->dst
, icmp_packet
->orig
);
323 ether_addr_copy(icmp_packet
->orig
, primary_if
->net_dev
->dev_addr
);
324 icmp_packet
->msg_type
= BATADV_TTL_EXCEEDED
;
325 icmp_packet
->ttl
= BATADV_TTL
;
327 if (batadv_send_skb_to_orig(skb
, orig_node
, NULL
) != NET_XMIT_DROP
)
328 ret
= NET_RX_SUCCESS
;
332 batadv_hardif_put(primary_if
);
334 batadv_orig_node_put(orig_node
);
338 int batadv_recv_icmp_packet(struct sk_buff
*skb
,
339 struct batadv_hard_iface
*recv_if
)
341 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
342 struct batadv_icmp_header
*icmph
;
343 struct batadv_icmp_packet_rr
*icmp_packet_rr
;
344 struct ethhdr
*ethhdr
;
345 struct batadv_orig_node
*orig_node
= NULL
;
346 int hdr_size
= sizeof(struct batadv_icmp_header
);
347 int ret
= NET_RX_DROP
;
349 /* drop packet if it has not necessary minimum size */
350 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
353 ethhdr
= eth_hdr(skb
);
355 /* packet with unicast indication but broadcast recipient */
356 if (is_broadcast_ether_addr(ethhdr
->h_dest
))
359 /* packet with broadcast sender address */
360 if (is_broadcast_ether_addr(ethhdr
->h_source
))
364 if (!batadv_is_my_mac(bat_priv
, ethhdr
->h_dest
))
367 icmph
= (struct batadv_icmp_header
*)skb
->data
;
369 /* add record route information if not full */
370 if ((icmph
->msg_type
== BATADV_ECHO_REPLY
||
371 icmph
->msg_type
== BATADV_ECHO_REQUEST
) &&
372 (skb
->len
>= sizeof(struct batadv_icmp_packet_rr
))) {
373 if (skb_linearize(skb
) < 0)
376 /* create a copy of the skb, if needed, to modify it. */
377 if (skb_cow(skb
, ETH_HLEN
) < 0)
380 icmph
= (struct batadv_icmp_header
*)skb
->data
;
381 icmp_packet_rr
= (struct batadv_icmp_packet_rr
*)icmph
;
382 if (icmp_packet_rr
->rr_cur
>= BATADV_RR_LEN
)
385 ether_addr_copy(icmp_packet_rr
->rr
[icmp_packet_rr
->rr_cur
],
387 icmp_packet_rr
->rr_cur
++;
391 if (batadv_is_my_mac(bat_priv
, icmph
->dst
))
392 return batadv_recv_my_icmp_packet(bat_priv
, skb
);
396 return batadv_recv_icmp_ttl_exceeded(bat_priv
, skb
);
398 /* get routing information */
399 orig_node
= batadv_orig_hash_find(bat_priv
, icmph
->dst
);
403 /* create a copy of the skb, if needed, to modify it. */
404 if (skb_cow(skb
, ETH_HLEN
) < 0)
407 icmph
= (struct batadv_icmp_header
*)skb
->data
;
413 if (batadv_send_skb_to_orig(skb
, orig_node
, recv_if
) != NET_XMIT_DROP
)
414 ret
= NET_RX_SUCCESS
;
418 batadv_orig_node_put(orig_node
);
423 * batadv_check_unicast_packet - Check for malformed unicast packets
424 * @bat_priv: the bat priv with all the soft interface information
425 * @skb: packet to check
426 * @hdr_size: size of header to pull
428 * Check for short header and bad addresses in given packet.
430 * Return: negative value when check fails and 0 otherwise. The negative value
431 * depends on the reason: -ENODATA for bad header, -EBADR for broadcast
432 * destination or source, and -EREMOTE for non-local (other host) destination.
434 static int batadv_check_unicast_packet(struct batadv_priv
*bat_priv
,
435 struct sk_buff
*skb
, int hdr_size
)
437 struct ethhdr
*ethhdr
;
439 /* drop packet if it has not necessary minimum size */
440 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
443 ethhdr
= eth_hdr(skb
);
445 /* packet with unicast indication but broadcast recipient */
446 if (is_broadcast_ether_addr(ethhdr
->h_dest
))
449 /* packet with broadcast sender address */
450 if (is_broadcast_ether_addr(ethhdr
->h_source
))
454 if (!batadv_is_my_mac(bat_priv
, ethhdr
->h_dest
))
461 * batadv_find_router - find a suitable router for this originator
462 * @bat_priv: the bat priv with all the soft interface information
463 * @orig_node: the destination node
464 * @recv_if: pointer to interface this packet was received on
466 * Return: the router which should be used for this orig_node on
467 * this interface, or NULL if not available.
469 struct batadv_neigh_node
*
470 batadv_find_router(struct batadv_priv
*bat_priv
,
471 struct batadv_orig_node
*orig_node
,
472 struct batadv_hard_iface
*recv_if
)
474 struct batadv_algo_ops
*bao
= bat_priv
->bat_algo_ops
;
475 struct batadv_neigh_node
*first_candidate_router
= NULL
;
476 struct batadv_neigh_node
*next_candidate_router
= NULL
;
477 struct batadv_neigh_node
*router
, *cand_router
= NULL
;
478 struct batadv_neigh_node
*last_cand_router
= NULL
;
479 struct batadv_orig_ifinfo
*cand
, *first_candidate
= NULL
;
480 struct batadv_orig_ifinfo
*next_candidate
= NULL
;
481 struct batadv_orig_ifinfo
*last_candidate
;
482 bool last_candidate_found
= false;
487 router
= batadv_orig_router_get(orig_node
, recv_if
);
492 /* only consider bonding for recv_if == BATADV_IF_DEFAULT (first hop)
495 if (!(recv_if
== BATADV_IF_DEFAULT
&& atomic_read(&bat_priv
->bonding
)))
498 /* bonding: loop through the list of possible routers found
499 * for the various outgoing interfaces and find a candidate after
500 * the last chosen bonding candidate (next_candidate). If no such
501 * router is found, use the first candidate found (the previously
502 * chosen bonding candidate might have been the last one in the list).
503 * If this can't be found either, return the previously chosen
504 * router - obviously there are no other candidates.
507 last_candidate
= orig_node
->last_bonding_candidate
;
509 last_cand_router
= rcu_dereference(last_candidate
->router
);
511 hlist_for_each_entry_rcu(cand
, &orig_node
->ifinfo_list
, list
) {
512 /* acquire some structures and references ... */
513 if (!kref_get_unless_zero(&cand
->refcount
))
516 cand_router
= rcu_dereference(cand
->router
);
520 if (!kref_get_unless_zero(&cand_router
->refcount
)) {
525 /* alternative candidate should be good enough to be
528 if (!bao
->bat_neigh_is_similar_or_better(cand_router
,
533 /* don't use the same router twice */
534 if (last_cand_router
== cand_router
)
537 /* mark the first possible candidate */
538 if (!first_candidate
) {
539 kref_get(&cand_router
->refcount
);
540 kref_get(&cand
->refcount
);
541 first_candidate
= cand
;
542 first_candidate_router
= cand_router
;
545 /* check if the loop has already passed the previously selected
546 * candidate ... this function should select the next candidate
547 * AFTER the previously used bonding candidate.
549 if (!last_candidate
|| last_candidate_found
) {
550 next_candidate
= cand
;
551 next_candidate_router
= cand_router
;
555 if (last_candidate
== cand
)
556 last_candidate_found
= true;
558 /* free references */
560 batadv_neigh_node_put(cand_router
);
563 batadv_orig_ifinfo_put(cand
);
567 /* last_bonding_candidate is reset below, remove the old reference. */
568 if (orig_node
->last_bonding_candidate
)
569 batadv_orig_ifinfo_put(orig_node
->last_bonding_candidate
);
571 /* After finding candidates, handle the three cases:
572 * 1) there is a next candidate, use that
573 * 2) there is no next candidate, use the first of the list
574 * 3) there is no candidate at all, return the default router
576 if (next_candidate
) {
577 batadv_neigh_node_put(router
);
579 /* remove references to first candidate, we don't need it. */
580 if (first_candidate
) {
581 batadv_neigh_node_put(first_candidate_router
);
582 batadv_orig_ifinfo_put(first_candidate
);
584 router
= next_candidate_router
;
585 orig_node
->last_bonding_candidate
= next_candidate
;
586 } else if (first_candidate
) {
587 batadv_neigh_node_put(router
);
589 /* refcounting has already been done in the loop above. */
590 router
= first_candidate_router
;
591 orig_node
->last_bonding_candidate
= first_candidate
;
593 orig_node
->last_bonding_candidate
= NULL
;
599 static int batadv_route_unicast_packet(struct sk_buff
*skb
,
600 struct batadv_hard_iface
*recv_if
)
602 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
603 struct batadv_orig_node
*orig_node
= NULL
;
604 struct batadv_unicast_packet
*unicast_packet
;
605 struct ethhdr
*ethhdr
= eth_hdr(skb
);
606 int res
, hdr_len
, ret
= NET_RX_DROP
;
609 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
612 if (unicast_packet
->ttl
< 2) {
613 pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n",
614 ethhdr
->h_source
, unicast_packet
->dest
);
618 /* get routing information */
619 orig_node
= batadv_orig_hash_find(bat_priv
, unicast_packet
->dest
);
624 /* create a copy of the skb, if needed, to modify it. */
625 if (skb_cow(skb
, ETH_HLEN
) < 0)
629 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
630 unicast_packet
->ttl
--;
632 switch (unicast_packet
->packet_type
) {
633 case BATADV_UNICAST_4ADDR
:
634 hdr_len
= sizeof(struct batadv_unicast_4addr_packet
);
637 hdr_len
= sizeof(struct batadv_unicast_packet
);
640 /* other packet types not supported - yet */
646 batadv_skb_set_priority(skb
, hdr_len
);
649 res
= batadv_send_skb_to_orig(skb
, orig_node
, recv_if
);
651 /* translate transmit result into receive result */
652 if (res
== NET_XMIT_SUCCESS
) {
653 /* skb was transmitted and consumed */
654 batadv_inc_counter(bat_priv
, BATADV_CNT_FORWARD
);
655 batadv_add_counter(bat_priv
, BATADV_CNT_FORWARD_BYTES
,
658 ret
= NET_RX_SUCCESS
;
659 } else if (res
== -EINPROGRESS
) {
660 /* skb was buffered and consumed */
661 ret
= NET_RX_SUCCESS
;
666 batadv_orig_node_put(orig_node
);
671 * batadv_reroute_unicast_packet - update the unicast header for re-routing
672 * @bat_priv: the bat priv with all the soft interface information
673 * @unicast_packet: the unicast header to be updated
674 * @dst_addr: the payload destination
675 * @vid: VLAN identifier
677 * Search the translation table for dst_addr and update the unicast header with
678 * the new corresponding information (originator address where the destination
679 * client currently is and its known TTVN)
681 * Return: true if the packet header has been updated, false otherwise
684 batadv_reroute_unicast_packet(struct batadv_priv
*bat_priv
,
685 struct batadv_unicast_packet
*unicast_packet
,
686 u8
*dst_addr
, unsigned short vid
)
688 struct batadv_orig_node
*orig_node
= NULL
;
689 struct batadv_hard_iface
*primary_if
= NULL
;
691 u8
*orig_addr
, orig_ttvn
;
693 if (batadv_is_my_client(bat_priv
, dst_addr
, vid
)) {
694 primary_if
= batadv_primary_if_get_selected(bat_priv
);
697 orig_addr
= primary_if
->net_dev
->dev_addr
;
698 orig_ttvn
= (u8
)atomic_read(&bat_priv
->tt
.vn
);
700 orig_node
= batadv_transtable_search(bat_priv
, NULL
, dst_addr
,
705 if (batadv_compare_eth(orig_node
->orig
, unicast_packet
->dest
))
708 orig_addr
= orig_node
->orig
;
709 orig_ttvn
= (u8
)atomic_read(&orig_node
->last_ttvn
);
712 /* update the packet header */
713 ether_addr_copy(unicast_packet
->dest
, orig_addr
);
714 unicast_packet
->ttvn
= orig_ttvn
;
719 batadv_hardif_put(primary_if
);
721 batadv_orig_node_put(orig_node
);
726 static bool batadv_check_unicast_ttvn(struct batadv_priv
*bat_priv
,
727 struct sk_buff
*skb
, int hdr_len
)
729 struct batadv_unicast_packet
*unicast_packet
;
730 struct batadv_hard_iface
*primary_if
;
731 struct batadv_orig_node
*orig_node
;
732 u8 curr_ttvn
, old_ttvn
;
733 struct ethhdr
*ethhdr
;
737 /* check if there is enough data before accessing it */
738 if (!pskb_may_pull(skb
, hdr_len
+ ETH_HLEN
))
741 /* create a copy of the skb (in case of for re-routing) to modify it. */
742 if (skb_cow(skb
, sizeof(*unicast_packet
)) < 0)
745 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
746 vid
= batadv_get_vid(skb
, hdr_len
);
747 ethhdr
= (struct ethhdr
*)(skb
->data
+ hdr_len
);
749 /* check if the destination client was served by this node and it is now
750 * roaming. In this case, it means that the node has got a ROAM_ADV
751 * message and that it knows the new destination in the mesh to re-route
754 if (batadv_tt_local_client_is_roaming(bat_priv
, ethhdr
->h_dest
, vid
)) {
755 if (batadv_reroute_unicast_packet(bat_priv
, unicast_packet
,
756 ethhdr
->h_dest
, vid
))
757 batadv_dbg_ratelimited(BATADV_DBG_TT
,
759 "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n",
760 unicast_packet
->dest
,
762 /* at this point the mesh destination should have been
763 * substituted with the originator address found in the global
764 * table. If not, let the packet go untouched anyway because
765 * there is nothing the node can do
770 /* retrieve the TTVN known by this node for the packet destination. This
771 * value is used later to check if the node which sent (or re-routed
772 * last time) the packet had an updated information or not
774 curr_ttvn
= (u8
)atomic_read(&bat_priv
->tt
.vn
);
775 if (!batadv_is_my_mac(bat_priv
, unicast_packet
->dest
)) {
776 orig_node
= batadv_orig_hash_find(bat_priv
,
777 unicast_packet
->dest
);
778 /* if it is not possible to find the orig_node representing the
779 * destination, the packet can immediately be dropped as it will
780 * not be possible to deliver it
785 curr_ttvn
= (u8
)atomic_read(&orig_node
->last_ttvn
);
786 batadv_orig_node_put(orig_node
);
789 /* check if the TTVN contained in the packet is fresher than what the
792 is_old_ttvn
= batadv_seq_before(unicast_packet
->ttvn
, curr_ttvn
);
796 old_ttvn
= unicast_packet
->ttvn
;
797 /* the packet was forged based on outdated network information. Its
798 * destination can possibly be updated and forwarded towards the new
801 if (batadv_reroute_unicast_packet(bat_priv
, unicast_packet
,
802 ethhdr
->h_dest
, vid
)) {
803 batadv_dbg_ratelimited(BATADV_DBG_TT
, bat_priv
,
804 "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n",
805 unicast_packet
->dest
, ethhdr
->h_dest
,
806 old_ttvn
, curr_ttvn
);
810 /* the packet has not been re-routed: either the destination is
811 * currently served by this node or there is no destination at all and
812 * it is possible to drop the packet
814 if (!batadv_is_my_client(bat_priv
, ethhdr
->h_dest
, vid
))
817 /* update the header in order to let the packet be delivered to this
818 * node's soft interface
820 primary_if
= batadv_primary_if_get_selected(bat_priv
);
824 ether_addr_copy(unicast_packet
->dest
, primary_if
->net_dev
->dev_addr
);
826 batadv_hardif_put(primary_if
);
828 unicast_packet
->ttvn
= curr_ttvn
;
834 * batadv_recv_unhandled_unicast_packet - receive and process packets which
835 * are in the unicast number space but not yet known to the implementation
836 * @skb: unicast tvlv packet to process
837 * @recv_if: pointer to interface this packet was received on
839 * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
842 int batadv_recv_unhandled_unicast_packet(struct sk_buff
*skb
,
843 struct batadv_hard_iface
*recv_if
)
845 struct batadv_unicast_packet
*unicast_packet
;
846 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
847 int check
, hdr_size
= sizeof(*unicast_packet
);
849 check
= batadv_check_unicast_packet(bat_priv
, skb
, hdr_size
);
853 /* we don't know about this type, drop it. */
854 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
855 if (batadv_is_my_mac(bat_priv
, unicast_packet
->dest
))
858 return batadv_route_unicast_packet(skb
, recv_if
);
861 int batadv_recv_unicast_packet(struct sk_buff
*skb
,
862 struct batadv_hard_iface
*recv_if
)
864 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
865 struct batadv_unicast_packet
*unicast_packet
;
866 struct batadv_unicast_4addr_packet
*unicast_4addr_packet
;
868 struct batadv_orig_node
*orig_node
= NULL
;
869 int check
, hdr_size
= sizeof(*unicast_packet
);
870 enum batadv_subtype subtype
;
873 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
874 unicast_4addr_packet
= (struct batadv_unicast_4addr_packet
*)skb
->data
;
876 is4addr
= unicast_packet
->packet_type
== BATADV_UNICAST_4ADDR
;
877 /* the caller function should have already pulled 2 bytes */
879 hdr_size
= sizeof(*unicast_4addr_packet
);
881 /* function returns -EREMOTE for promiscuous packets */
882 check
= batadv_check_unicast_packet(bat_priv
, skb
, hdr_size
);
884 /* Even though the packet is not for us, we might save it to use for
885 * decoding a later received coded packet
887 if (check
== -EREMOTE
)
888 batadv_nc_skb_store_sniffed_unicast(bat_priv
, skb
);
892 if (!batadv_check_unicast_ttvn(bat_priv
, skb
, hdr_size
))
896 if (batadv_is_my_mac(bat_priv
, unicast_packet
->dest
)) {
898 subtype
= unicast_4addr_packet
->subtype
;
899 batadv_dat_inc_counter(bat_priv
, subtype
);
901 /* Only payload data should be considered for speedy
902 * join. For example, DAT also uses unicast 4addr
903 * types, but those packets should not be considered
904 * for speedy join, since the clients do not actually
905 * reside at the sending originator.
907 if (subtype
== BATADV_P_DATA
) {
908 orig_addr
= unicast_4addr_packet
->src
;
909 orig_node
= batadv_orig_hash_find(bat_priv
,
914 if (batadv_dat_snoop_incoming_arp_request(bat_priv
, skb
,
917 if (batadv_dat_snoop_incoming_arp_reply(bat_priv
, skb
,
921 batadv_interface_rx(recv_if
->soft_iface
, skb
, hdr_size
,
926 batadv_orig_node_put(orig_node
);
928 return NET_RX_SUCCESS
;
931 return batadv_route_unicast_packet(skb
, recv_if
);
935 * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets
936 * @skb: unicast tvlv packet to process
937 * @recv_if: pointer to interface this packet was received on
939 * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
942 int batadv_recv_unicast_tvlv(struct sk_buff
*skb
,
943 struct batadv_hard_iface
*recv_if
)
945 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
946 struct batadv_unicast_tvlv_packet
*unicast_tvlv_packet
;
947 unsigned char *tvlv_buff
;
949 int hdr_size
= sizeof(*unicast_tvlv_packet
);
950 int ret
= NET_RX_DROP
;
952 if (batadv_check_unicast_packet(bat_priv
, skb
, hdr_size
) < 0)
955 /* the header is likely to be modified while forwarding */
956 if (skb_cow(skb
, hdr_size
) < 0)
959 /* packet needs to be linearized to access the tvlv content */
960 if (skb_linearize(skb
) < 0)
963 unicast_tvlv_packet
= (struct batadv_unicast_tvlv_packet
*)skb
->data
;
965 tvlv_buff
= (unsigned char *)(skb
->data
+ hdr_size
);
966 tvlv_buff_len
= ntohs(unicast_tvlv_packet
->tvlv_len
);
968 if (tvlv_buff_len
> skb
->len
- hdr_size
)
971 ret
= batadv_tvlv_containers_process(bat_priv
, false, NULL
,
972 unicast_tvlv_packet
->src
,
973 unicast_tvlv_packet
->dst
,
974 tvlv_buff
, tvlv_buff_len
);
976 if (ret
!= NET_RX_SUCCESS
)
977 ret
= batadv_route_unicast_packet(skb
, recv_if
);
985 * batadv_recv_frag_packet - process received fragment
986 * @skb: the received fragment
987 * @recv_if: interface that the skb is received on
989 * This function does one of the three following things: 1) Forward fragment, if
990 * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till
991 * lack further fragments; 3) Merge fragments, if we have all needed parts.
993 * Return: NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise.
995 int batadv_recv_frag_packet(struct sk_buff
*skb
,
996 struct batadv_hard_iface
*recv_if
)
998 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
999 struct batadv_orig_node
*orig_node_src
= NULL
;
1000 struct batadv_frag_packet
*frag_packet
;
1001 int ret
= NET_RX_DROP
;
1003 if (batadv_check_unicast_packet(bat_priv
, skb
,
1004 sizeof(*frag_packet
)) < 0)
1007 frag_packet
= (struct batadv_frag_packet
*)skb
->data
;
1008 orig_node_src
= batadv_orig_hash_find(bat_priv
, frag_packet
->orig
);
1012 skb
->priority
= frag_packet
->priority
+ 256;
1014 /* Route the fragment if it is not for us and too big to be merged. */
1015 if (!batadv_is_my_mac(bat_priv
, frag_packet
->dest
) &&
1016 batadv_frag_skb_fwd(skb
, recv_if
, orig_node_src
)) {
1017 ret
= NET_RX_SUCCESS
;
1021 batadv_inc_counter(bat_priv
, BATADV_CNT_FRAG_RX
);
1022 batadv_add_counter(bat_priv
, BATADV_CNT_FRAG_RX_BYTES
, skb
->len
);
1024 /* Add fragment to buffer and merge if possible. */
1025 if (!batadv_frag_skb_buffer(&skb
, orig_node_src
))
1028 /* Deliver merged packet to the appropriate handler, if it was
1032 batadv_batman_skb_recv(skb
, recv_if
->net_dev
,
1033 &recv_if
->batman_adv_ptype
, NULL
);
1035 ret
= NET_RX_SUCCESS
;
1039 batadv_orig_node_put(orig_node_src
);
1044 int batadv_recv_bcast_packet(struct sk_buff
*skb
,
1045 struct batadv_hard_iface
*recv_if
)
1047 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1048 struct batadv_orig_node
*orig_node
= NULL
;
1049 struct batadv_bcast_packet
*bcast_packet
;
1050 struct ethhdr
*ethhdr
;
1051 int hdr_size
= sizeof(*bcast_packet
);
1052 int ret
= NET_RX_DROP
;
1056 /* drop packet if it has not necessary minimum size */
1057 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
1060 ethhdr
= eth_hdr(skb
);
1062 /* packet with broadcast indication but unicast recipient */
1063 if (!is_broadcast_ether_addr(ethhdr
->h_dest
))
1066 /* packet with broadcast sender address */
1067 if (is_broadcast_ether_addr(ethhdr
->h_source
))
1070 /* ignore broadcasts sent by myself */
1071 if (batadv_is_my_mac(bat_priv
, ethhdr
->h_source
))
1074 bcast_packet
= (struct batadv_bcast_packet
*)skb
->data
;
1076 /* ignore broadcasts originated by myself */
1077 if (batadv_is_my_mac(bat_priv
, bcast_packet
->orig
))
1080 if (bcast_packet
->ttl
< 2)
1083 orig_node
= batadv_orig_hash_find(bat_priv
, bcast_packet
->orig
);
1088 spin_lock_bh(&orig_node
->bcast_seqno_lock
);
1090 seqno
= ntohl(bcast_packet
->seqno
);
1091 /* check whether the packet is a duplicate */
1092 if (batadv_test_bit(orig_node
->bcast_bits
, orig_node
->last_bcast_seqno
,
1096 seq_diff
= seqno
- orig_node
->last_bcast_seqno
;
1098 /* check whether the packet is old and the host just restarted. */
1099 if (batadv_window_protected(bat_priv
, seq_diff
,
1100 BATADV_BCAST_MAX_AGE
,
1101 &orig_node
->bcast_seqno_reset
, NULL
))
1104 /* mark broadcast in flood history, update window position
1107 if (batadv_bit_get_packet(bat_priv
, orig_node
->bcast_bits
, seq_diff
, 1))
1108 orig_node
->last_bcast_seqno
= seqno
;
1110 spin_unlock_bh(&orig_node
->bcast_seqno_lock
);
1112 /* check whether this has been sent by another originator before */
1113 if (batadv_bla_check_bcast_duplist(bat_priv
, skb
))
1116 batadv_skb_set_priority(skb
, sizeof(struct batadv_bcast_packet
));
1118 /* rebroadcast packet */
1119 batadv_add_bcast_packet_to_list(bat_priv
, skb
, 1);
1121 /* don't hand the broadcast up if it is from an originator
1122 * from the same backbone.
1124 if (batadv_bla_is_backbone_gw(skb
, orig_node
, hdr_size
))
1127 if (batadv_dat_snoop_incoming_arp_request(bat_priv
, skb
, hdr_size
))
1129 if (batadv_dat_snoop_incoming_arp_reply(bat_priv
, skb
, hdr_size
))
1132 /* broadcast for me */
1133 batadv_interface_rx(recv_if
->soft_iface
, skb
, hdr_size
, orig_node
);
1136 ret
= NET_RX_SUCCESS
;
1140 spin_unlock_bh(&orig_node
->bcast_seqno_lock
);
1143 batadv_orig_node_put(orig_node
);