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/netdevice.h>
29 #include <linux/printk.h>
30 #include <linux/rculist.h>
31 #include <linux/rcupdate.h>
32 #include <linux/skbuff.h>
33 #include <linux/spinlock.h>
34 #include <linux/stddef.h>
37 #include "bridge_loop_avoidance.h"
38 #include "distributed-arp-table.h"
39 #include "fragmentation.h"
40 #include "hard-interface.h"
41 #include "icmp_socket.h"
42 #include "network-coding.h"
43 #include "originator.h"
46 #include "soft-interface.h"
47 #include "translation-table.h"
49 static int batadv_route_unicast_packet(struct sk_buff
*skb
,
50 struct batadv_hard_iface
*recv_if
);
53 * _batadv_update_route - set the router for this originator
54 * @bat_priv: the bat priv with all the soft interface information
55 * @orig_node: orig node which is to be configured
56 * @recv_if: the receive interface for which this route is set
57 * @neigh_node: neighbor which should be the next router
59 * This function does not perform any error checks
61 static void _batadv_update_route(struct batadv_priv
*bat_priv
,
62 struct batadv_orig_node
*orig_node
,
63 struct batadv_hard_iface
*recv_if
,
64 struct batadv_neigh_node
*neigh_node
)
66 struct batadv_orig_ifinfo
*orig_ifinfo
;
67 struct batadv_neigh_node
*curr_router
;
69 orig_ifinfo
= batadv_orig_ifinfo_get(orig_node
, recv_if
);
74 curr_router
= rcu_dereference(orig_ifinfo
->router
);
75 if (curr_router
&& !atomic_inc_not_zero(&curr_router
->refcount
))
80 if ((curr_router
) && (!neigh_node
)) {
81 batadv_dbg(BATADV_DBG_ROUTES
, bat_priv
,
82 "Deleting route towards: %pM\n", orig_node
->orig
);
83 batadv_tt_global_del_orig(bat_priv
, orig_node
, -1,
84 "Deleted route towards originator");
87 } else if ((!curr_router
) && (neigh_node
)) {
88 batadv_dbg(BATADV_DBG_ROUTES
, bat_priv
,
89 "Adding route towards: %pM (via %pM)\n",
90 orig_node
->orig
, neigh_node
->addr
);
92 } else if (neigh_node
&& curr_router
) {
93 batadv_dbg(BATADV_DBG_ROUTES
, bat_priv
,
94 "Changing route towards: %pM (now via %pM - was via %pM)\n",
95 orig_node
->orig
, neigh_node
->addr
,
100 batadv_neigh_node_free_ref(curr_router
);
102 /* increase refcount of new best neighbor */
103 if (neigh_node
&& !atomic_inc_not_zero(&neigh_node
->refcount
))
106 spin_lock_bh(&orig_node
->neigh_list_lock
);
107 rcu_assign_pointer(orig_ifinfo
->router
, neigh_node
);
108 spin_unlock_bh(&orig_node
->neigh_list_lock
);
109 batadv_orig_ifinfo_free_ref(orig_ifinfo
);
111 /* decrease refcount of previous best neighbor */
113 batadv_neigh_node_free_ref(curr_router
);
117 * batadv_update_route - set the router for this originator
118 * @bat_priv: the bat priv with all the soft interface information
119 * @orig_node: orig node which is to be configured
120 * @recv_if: the receive interface for which this route is set
121 * @neigh_node: neighbor which should be the next router
123 void batadv_update_route(struct batadv_priv
*bat_priv
,
124 struct batadv_orig_node
*orig_node
,
125 struct batadv_hard_iface
*recv_if
,
126 struct batadv_neigh_node
*neigh_node
)
128 struct batadv_neigh_node
*router
= NULL
;
133 router
= batadv_orig_router_get(orig_node
, recv_if
);
135 if (router
!= neigh_node
)
136 _batadv_update_route(bat_priv
, orig_node
, recv_if
, neigh_node
);
140 batadv_neigh_node_free_ref(router
);
144 * batadv_window_protected - checks whether the host restarted and is in the
146 * @bat_priv: the bat priv with all the soft interface information
147 * @seq_num_diff: difference between the current/received sequence number and
148 * the last sequence number
149 * @last_reset: jiffies timestamp of the last reset, will be updated when reset
153 * 0 if the packet is to be accepted.
154 * 1 if the packet is to be ignored.
156 int batadv_window_protected(struct batadv_priv
*bat_priv
, s32 seq_num_diff
,
157 unsigned long *last_reset
)
159 if (seq_num_diff
<= -BATADV_TQ_LOCAL_WINDOW_SIZE
||
160 seq_num_diff
>= BATADV_EXPECTED_SEQNO_RANGE
) {
161 if (!batadv_has_timed_out(*last_reset
,
162 BATADV_RESET_PROTECTION_MS
))
165 *last_reset
= jiffies
;
166 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
167 "old packet received, start protection\n");
173 bool batadv_check_management_packet(struct sk_buff
*skb
,
174 struct batadv_hard_iface
*hard_iface
,
177 struct ethhdr
*ethhdr
;
179 /* drop packet if it has not necessary minimum size */
180 if (unlikely(!pskb_may_pull(skb
, header_len
)))
183 ethhdr
= eth_hdr(skb
);
185 /* packet with broadcast indication but unicast recipient */
186 if (!is_broadcast_ether_addr(ethhdr
->h_dest
))
189 /* packet with broadcast sender address */
190 if (is_broadcast_ether_addr(ethhdr
->h_source
))
193 /* create a copy of the skb, if needed, to modify it. */
194 if (skb_cow(skb
, 0) < 0)
197 /* keep skb linear */
198 if (skb_linearize(skb
) < 0)
205 * batadv_recv_my_icmp_packet - receive an icmp packet locally
206 * @bat_priv: the bat priv with all the soft interface information
207 * @skb: icmp packet to process
209 * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
212 static int batadv_recv_my_icmp_packet(struct batadv_priv
*bat_priv
,
215 struct batadv_hard_iface
*primary_if
= NULL
;
216 struct batadv_orig_node
*orig_node
= NULL
;
217 struct batadv_icmp_header
*icmph
;
218 int res
, ret
= NET_RX_DROP
;
220 icmph
= (struct batadv_icmp_header
*)skb
->data
;
222 switch (icmph
->msg_type
) {
223 case BATADV_ECHO_REPLY
:
224 case BATADV_DESTINATION_UNREACHABLE
:
225 case BATADV_TTL_EXCEEDED
:
226 /* receive the packet */
227 if (skb_linearize(skb
) < 0)
230 batadv_socket_receive_packet(icmph
, skb
->len
);
232 case BATADV_ECHO_REQUEST
:
233 /* answer echo request (ping) */
234 primary_if
= batadv_primary_if_get_selected(bat_priv
);
238 /* get routing information */
239 orig_node
= batadv_orig_hash_find(bat_priv
, icmph
->orig
);
243 /* create a copy of the skb, if needed, to modify it. */
244 if (skb_cow(skb
, ETH_HLEN
) < 0)
247 icmph
= (struct batadv_icmp_header
*)skb
->data
;
249 ether_addr_copy(icmph
->dst
, icmph
->orig
);
250 ether_addr_copy(icmph
->orig
, primary_if
->net_dev
->dev_addr
);
251 icmph
->msg_type
= BATADV_ECHO_REPLY
;
252 icmph
->ttl
= BATADV_TTL
;
254 res
= batadv_send_skb_to_orig(skb
, orig_node
, NULL
);
255 if (res
!= NET_XMIT_DROP
)
256 ret
= NET_RX_SUCCESS
;
260 /* drop unknown type */
265 batadv_hardif_free_ref(primary_if
);
267 batadv_orig_node_free_ref(orig_node
);
271 static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv
*bat_priv
,
274 struct batadv_hard_iface
*primary_if
= NULL
;
275 struct batadv_orig_node
*orig_node
= NULL
;
276 struct batadv_icmp_packet
*icmp_packet
;
277 int ret
= NET_RX_DROP
;
279 icmp_packet
= (struct batadv_icmp_packet
*)skb
->data
;
281 /* send TTL exceeded if packet is an echo request (traceroute) */
282 if (icmp_packet
->msg_type
!= BATADV_ECHO_REQUEST
) {
283 pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n",
284 icmp_packet
->orig
, icmp_packet
->dst
);
288 primary_if
= batadv_primary_if_get_selected(bat_priv
);
292 /* get routing information */
293 orig_node
= batadv_orig_hash_find(bat_priv
, icmp_packet
->orig
);
297 /* create a copy of the skb, if needed, to modify it. */
298 if (skb_cow(skb
, ETH_HLEN
) < 0)
301 icmp_packet
= (struct batadv_icmp_packet
*)skb
->data
;
303 ether_addr_copy(icmp_packet
->dst
, icmp_packet
->orig
);
304 ether_addr_copy(icmp_packet
->orig
, primary_if
->net_dev
->dev_addr
);
305 icmp_packet
->msg_type
= BATADV_TTL_EXCEEDED
;
306 icmp_packet
->ttl
= BATADV_TTL
;
308 if (batadv_send_skb_to_orig(skb
, orig_node
, NULL
) != NET_XMIT_DROP
)
309 ret
= NET_RX_SUCCESS
;
313 batadv_hardif_free_ref(primary_if
);
315 batadv_orig_node_free_ref(orig_node
);
319 int batadv_recv_icmp_packet(struct sk_buff
*skb
,
320 struct batadv_hard_iface
*recv_if
)
322 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
323 struct batadv_icmp_header
*icmph
;
324 struct batadv_icmp_packet_rr
*icmp_packet_rr
;
325 struct ethhdr
*ethhdr
;
326 struct batadv_orig_node
*orig_node
= NULL
;
327 int hdr_size
= sizeof(struct batadv_icmp_header
);
328 int ret
= NET_RX_DROP
;
330 /* drop packet if it has not necessary minimum size */
331 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
334 ethhdr
= eth_hdr(skb
);
336 /* packet with unicast indication but broadcast recipient */
337 if (is_broadcast_ether_addr(ethhdr
->h_dest
))
340 /* packet with broadcast sender address */
341 if (is_broadcast_ether_addr(ethhdr
->h_source
))
345 if (!batadv_is_my_mac(bat_priv
, ethhdr
->h_dest
))
348 icmph
= (struct batadv_icmp_header
*)skb
->data
;
350 /* add record route information if not full */
351 if ((icmph
->msg_type
== BATADV_ECHO_REPLY
||
352 icmph
->msg_type
== BATADV_ECHO_REQUEST
) &&
353 (skb
->len
>= sizeof(struct batadv_icmp_packet_rr
))) {
354 if (skb_linearize(skb
) < 0)
357 /* create a copy of the skb, if needed, to modify it. */
358 if (skb_cow(skb
, ETH_HLEN
) < 0)
361 icmph
= (struct batadv_icmp_header
*)skb
->data
;
362 icmp_packet_rr
= (struct batadv_icmp_packet_rr
*)icmph
;
363 if (icmp_packet_rr
->rr_cur
>= BATADV_RR_LEN
)
366 ether_addr_copy(icmp_packet_rr
->rr
[icmp_packet_rr
->rr_cur
],
368 icmp_packet_rr
->rr_cur
++;
372 if (batadv_is_my_mac(bat_priv
, icmph
->dst
))
373 return batadv_recv_my_icmp_packet(bat_priv
, skb
);
377 return batadv_recv_icmp_ttl_exceeded(bat_priv
, skb
);
379 /* get routing information */
380 orig_node
= batadv_orig_hash_find(bat_priv
, icmph
->dst
);
384 /* create a copy of the skb, if needed, to modify it. */
385 if (skb_cow(skb
, ETH_HLEN
) < 0)
388 icmph
= (struct batadv_icmp_header
*)skb
->data
;
394 if (batadv_send_skb_to_orig(skb
, orig_node
, recv_if
) != NET_XMIT_DROP
)
395 ret
= NET_RX_SUCCESS
;
399 batadv_orig_node_free_ref(orig_node
);
404 * batadv_check_unicast_packet - Check for malformed unicast packets
405 * @bat_priv: the bat priv with all the soft interface information
406 * @skb: packet to check
407 * @hdr_size: size of header to pull
409 * Check for short header and bad addresses in given packet.
411 * Return: negative value when check fails and 0 otherwise. The negative value
412 * depends on the reason: -ENODATA for bad header, -EBADR for broadcast
413 * destination or source, and -EREMOTE for non-local (other host) destination.
415 static int batadv_check_unicast_packet(struct batadv_priv
*bat_priv
,
416 struct sk_buff
*skb
, int hdr_size
)
418 struct ethhdr
*ethhdr
;
420 /* drop packet if it has not necessary minimum size */
421 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
424 ethhdr
= eth_hdr(skb
);
426 /* packet with unicast indication but broadcast recipient */
427 if (is_broadcast_ether_addr(ethhdr
->h_dest
))
430 /* packet with broadcast sender address */
431 if (is_broadcast_ether_addr(ethhdr
->h_source
))
435 if (!batadv_is_my_mac(bat_priv
, ethhdr
->h_dest
))
442 * batadv_find_router - find a suitable router for this originator
443 * @bat_priv: the bat priv with all the soft interface information
444 * @orig_node: the destination node
445 * @recv_if: pointer to interface this packet was received on
447 * Return: the router which should be used for this orig_node on
448 * this interface, or NULL if not available.
450 struct batadv_neigh_node
*
451 batadv_find_router(struct batadv_priv
*bat_priv
,
452 struct batadv_orig_node
*orig_node
,
453 struct batadv_hard_iface
*recv_if
)
455 struct batadv_algo_ops
*bao
= bat_priv
->bat_algo_ops
;
456 struct batadv_neigh_node
*first_candidate_router
= NULL
;
457 struct batadv_neigh_node
*next_candidate_router
= NULL
;
458 struct batadv_neigh_node
*router
, *cand_router
= NULL
;
459 struct batadv_neigh_node
*last_cand_router
= NULL
;
460 struct batadv_orig_ifinfo
*cand
, *first_candidate
= NULL
;
461 struct batadv_orig_ifinfo
*next_candidate
= NULL
;
462 struct batadv_orig_ifinfo
*last_candidate
;
463 bool last_candidate_found
= false;
468 router
= batadv_orig_router_get(orig_node
, recv_if
);
473 /* only consider bonding for recv_if == BATADV_IF_DEFAULT (first hop)
476 if (!(recv_if
== BATADV_IF_DEFAULT
&& atomic_read(&bat_priv
->bonding
)))
479 /* bonding: loop through the list of possible routers found
480 * for the various outgoing interfaces and find a candidate after
481 * the last chosen bonding candidate (next_candidate). If no such
482 * router is found, use the first candidate found (the previously
483 * chosen bonding candidate might have been the last one in the list).
484 * If this can't be found either, return the previously chosen
485 * router - obviously there are no other candidates.
488 last_candidate
= orig_node
->last_bonding_candidate
;
490 last_cand_router
= rcu_dereference(last_candidate
->router
);
492 hlist_for_each_entry_rcu(cand
, &orig_node
->ifinfo_list
, list
) {
493 /* acquire some structures and references ... */
494 if (!atomic_inc_not_zero(&cand
->refcount
))
497 cand_router
= rcu_dereference(cand
->router
);
501 if (!atomic_inc_not_zero(&cand_router
->refcount
)) {
506 /* alternative candidate should be good enough to be
509 if (!bao
->bat_neigh_is_similar_or_better(cand_router
,
514 /* don't use the same router twice */
515 if (last_cand_router
== cand_router
)
518 /* mark the first possible candidate */
519 if (!first_candidate
) {
520 atomic_inc(&cand_router
->refcount
);
521 atomic_inc(&cand
->refcount
);
522 first_candidate
= cand
;
523 first_candidate_router
= cand_router
;
526 /* check if the loop has already passed the previously selected
527 * candidate ... this function should select the next candidate
528 * AFTER the previously used bonding candidate.
530 if (!last_candidate
|| last_candidate_found
) {
531 next_candidate
= cand
;
532 next_candidate_router
= cand_router
;
536 if (last_candidate
== cand
)
537 last_candidate_found
= true;
539 /* free references */
541 batadv_neigh_node_free_ref(cand_router
);
544 batadv_orig_ifinfo_free_ref(cand
);
548 /* last_bonding_candidate is reset below, remove the old reference. */
549 if (orig_node
->last_bonding_candidate
)
550 batadv_orig_ifinfo_free_ref(orig_node
->last_bonding_candidate
);
552 /* After finding candidates, handle the three cases:
553 * 1) there is a next candidate, use that
554 * 2) there is no next candidate, use the first of the list
555 * 3) there is no candidate at all, return the default router
557 if (next_candidate
) {
558 batadv_neigh_node_free_ref(router
);
560 /* remove references to first candidate, we don't need it. */
561 if (first_candidate
) {
562 batadv_neigh_node_free_ref(first_candidate_router
);
563 batadv_orig_ifinfo_free_ref(first_candidate
);
565 router
= next_candidate_router
;
566 orig_node
->last_bonding_candidate
= next_candidate
;
567 } else if (first_candidate
) {
568 batadv_neigh_node_free_ref(router
);
570 /* refcounting has already been done in the loop above. */
571 router
= first_candidate_router
;
572 orig_node
->last_bonding_candidate
= first_candidate
;
574 orig_node
->last_bonding_candidate
= NULL
;
580 static int batadv_route_unicast_packet(struct sk_buff
*skb
,
581 struct batadv_hard_iface
*recv_if
)
583 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
584 struct batadv_orig_node
*orig_node
= NULL
;
585 struct batadv_unicast_packet
*unicast_packet
;
586 struct ethhdr
*ethhdr
= eth_hdr(skb
);
587 int res
, hdr_len
, ret
= NET_RX_DROP
;
589 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
592 if (unicast_packet
->ttl
< 2) {
593 pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n",
594 ethhdr
->h_source
, unicast_packet
->dest
);
598 /* get routing information */
599 orig_node
= batadv_orig_hash_find(bat_priv
, unicast_packet
->dest
);
604 /* create a copy of the skb, if needed, to modify it. */
605 if (skb_cow(skb
, ETH_HLEN
) < 0)
609 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
610 unicast_packet
->ttl
--;
612 switch (unicast_packet
->packet_type
) {
613 case BATADV_UNICAST_4ADDR
:
614 hdr_len
= sizeof(struct batadv_unicast_4addr_packet
);
617 hdr_len
= sizeof(struct batadv_unicast_packet
);
620 /* other packet types not supported - yet */
626 batadv_skb_set_priority(skb
, hdr_len
);
628 res
= batadv_send_skb_to_orig(skb
, orig_node
, recv_if
);
630 /* translate transmit result into receive result */
631 if (res
== NET_XMIT_SUCCESS
) {
632 /* skb was transmitted and consumed */
633 batadv_inc_counter(bat_priv
, BATADV_CNT_FORWARD
);
634 batadv_add_counter(bat_priv
, BATADV_CNT_FORWARD_BYTES
,
635 skb
->len
+ ETH_HLEN
);
637 ret
= NET_RX_SUCCESS
;
638 } else if (res
== NET_XMIT_POLICED
) {
639 /* skb was buffered and consumed */
640 ret
= NET_RX_SUCCESS
;
645 batadv_orig_node_free_ref(orig_node
);
650 * batadv_reroute_unicast_packet - update the unicast header for re-routing
651 * @bat_priv: the bat priv with all the soft interface information
652 * @unicast_packet: the unicast header to be updated
653 * @dst_addr: the payload destination
654 * @vid: VLAN identifier
656 * Search the translation table for dst_addr and update the unicast header with
657 * the new corresponding information (originator address where the destination
658 * client currently is and its known TTVN)
660 * Return: true if the packet header has been updated, false otherwise
663 batadv_reroute_unicast_packet(struct batadv_priv
*bat_priv
,
664 struct batadv_unicast_packet
*unicast_packet
,
665 u8
*dst_addr
, unsigned short vid
)
667 struct batadv_orig_node
*orig_node
= NULL
;
668 struct batadv_hard_iface
*primary_if
= NULL
;
670 u8
*orig_addr
, orig_ttvn
;
672 if (batadv_is_my_client(bat_priv
, dst_addr
, vid
)) {
673 primary_if
= batadv_primary_if_get_selected(bat_priv
);
676 orig_addr
= primary_if
->net_dev
->dev_addr
;
677 orig_ttvn
= (u8
)atomic_read(&bat_priv
->tt
.vn
);
679 orig_node
= batadv_transtable_search(bat_priv
, NULL
, dst_addr
,
684 if (batadv_compare_eth(orig_node
->orig
, unicast_packet
->dest
))
687 orig_addr
= orig_node
->orig
;
688 orig_ttvn
= (u8
)atomic_read(&orig_node
->last_ttvn
);
691 /* update the packet header */
692 ether_addr_copy(unicast_packet
->dest
, orig_addr
);
693 unicast_packet
->ttvn
= orig_ttvn
;
698 batadv_hardif_free_ref(primary_if
);
700 batadv_orig_node_free_ref(orig_node
);
705 static int batadv_check_unicast_ttvn(struct batadv_priv
*bat_priv
,
706 struct sk_buff
*skb
, int hdr_len
) {
707 struct batadv_unicast_packet
*unicast_packet
;
708 struct batadv_hard_iface
*primary_if
;
709 struct batadv_orig_node
*orig_node
;
710 u8 curr_ttvn
, old_ttvn
;
711 struct ethhdr
*ethhdr
;
715 /* check if there is enough data before accessing it */
716 if (!pskb_may_pull(skb
, hdr_len
+ ETH_HLEN
))
719 /* create a copy of the skb (in case of for re-routing) to modify it. */
720 if (skb_cow(skb
, sizeof(*unicast_packet
)) < 0)
723 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
724 vid
= batadv_get_vid(skb
, hdr_len
);
725 ethhdr
= (struct ethhdr
*)(skb
->data
+ hdr_len
);
727 /* check if the destination client was served by this node and it is now
728 * roaming. In this case, it means that the node has got a ROAM_ADV
729 * message and that it knows the new destination in the mesh to re-route
732 if (batadv_tt_local_client_is_roaming(bat_priv
, ethhdr
->h_dest
, vid
)) {
733 if (batadv_reroute_unicast_packet(bat_priv
, unicast_packet
,
734 ethhdr
->h_dest
, vid
))
735 batadv_dbg_ratelimited(BATADV_DBG_TT
,
737 "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n",
738 unicast_packet
->dest
,
740 /* at this point the mesh destination should have been
741 * substituted with the originator address found in the global
742 * table. If not, let the packet go untouched anyway because
743 * there is nothing the node can do
748 /* retrieve the TTVN known by this node for the packet destination. This
749 * value is used later to check if the node which sent (or re-routed
750 * last time) the packet had an updated information or not
752 curr_ttvn
= (u8
)atomic_read(&bat_priv
->tt
.vn
);
753 if (!batadv_is_my_mac(bat_priv
, unicast_packet
->dest
)) {
754 orig_node
= batadv_orig_hash_find(bat_priv
,
755 unicast_packet
->dest
);
756 /* if it is not possible to find the orig_node representing the
757 * destination, the packet can immediately be dropped as it will
758 * not be possible to deliver it
763 curr_ttvn
= (u8
)atomic_read(&orig_node
->last_ttvn
);
764 batadv_orig_node_free_ref(orig_node
);
767 /* check if the TTVN contained in the packet is fresher than what the
770 is_old_ttvn
= batadv_seq_before(unicast_packet
->ttvn
, curr_ttvn
);
774 old_ttvn
= unicast_packet
->ttvn
;
775 /* the packet was forged based on outdated network information. Its
776 * destination can possibly be updated and forwarded towards the new
779 if (batadv_reroute_unicast_packet(bat_priv
, unicast_packet
,
780 ethhdr
->h_dest
, vid
)) {
781 batadv_dbg_ratelimited(BATADV_DBG_TT
, bat_priv
,
782 "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n",
783 unicast_packet
->dest
, ethhdr
->h_dest
,
784 old_ttvn
, curr_ttvn
);
788 /* the packet has not been re-routed: either the destination is
789 * currently served by this node or there is no destination at all and
790 * it is possible to drop the packet
792 if (!batadv_is_my_client(bat_priv
, ethhdr
->h_dest
, vid
))
795 /* update the header in order to let the packet be delivered to this
796 * node's soft interface
798 primary_if
= batadv_primary_if_get_selected(bat_priv
);
802 ether_addr_copy(unicast_packet
->dest
, primary_if
->net_dev
->dev_addr
);
804 batadv_hardif_free_ref(primary_if
);
806 unicast_packet
->ttvn
= curr_ttvn
;
812 * batadv_recv_unhandled_unicast_packet - receive and process packets which
813 * are in the unicast number space but not yet known to the implementation
814 * @skb: unicast tvlv packet to process
815 * @recv_if: pointer to interface this packet was received on
817 * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
820 int batadv_recv_unhandled_unicast_packet(struct sk_buff
*skb
,
821 struct batadv_hard_iface
*recv_if
)
823 struct batadv_unicast_packet
*unicast_packet
;
824 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
825 int check
, hdr_size
= sizeof(*unicast_packet
);
827 check
= batadv_check_unicast_packet(bat_priv
, skb
, hdr_size
);
831 /* we don't know about this type, drop it. */
832 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
833 if (batadv_is_my_mac(bat_priv
, unicast_packet
->dest
))
836 return batadv_route_unicast_packet(skb
, recv_if
);
839 int batadv_recv_unicast_packet(struct sk_buff
*skb
,
840 struct batadv_hard_iface
*recv_if
)
842 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
843 struct batadv_unicast_packet
*unicast_packet
;
844 struct batadv_unicast_4addr_packet
*unicast_4addr_packet
;
846 struct batadv_orig_node
*orig_node
= NULL
;
847 int check
, hdr_size
= sizeof(*unicast_packet
);
848 enum batadv_subtype subtype
;
851 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
852 unicast_4addr_packet
= (struct batadv_unicast_4addr_packet
*)skb
->data
;
854 is4addr
= unicast_packet
->packet_type
== BATADV_UNICAST_4ADDR
;
855 /* the caller function should have already pulled 2 bytes */
857 hdr_size
= sizeof(*unicast_4addr_packet
);
859 /* function returns -EREMOTE for promiscuous packets */
860 check
= batadv_check_unicast_packet(bat_priv
, skb
, hdr_size
);
862 /* Even though the packet is not for us, we might save it to use for
863 * decoding a later received coded packet
865 if (check
== -EREMOTE
)
866 batadv_nc_skb_store_sniffed_unicast(bat_priv
, skb
);
870 if (!batadv_check_unicast_ttvn(bat_priv
, skb
, hdr_size
))
874 if (batadv_is_my_mac(bat_priv
, unicast_packet
->dest
)) {
876 subtype
= unicast_4addr_packet
->subtype
;
877 batadv_dat_inc_counter(bat_priv
, subtype
);
879 /* Only payload data should be considered for speedy
880 * join. For example, DAT also uses unicast 4addr
881 * types, but those packets should not be considered
882 * for speedy join, since the clients do not actually
883 * reside at the sending originator.
885 if (subtype
== BATADV_P_DATA
) {
886 orig_addr
= unicast_4addr_packet
->src
;
887 orig_node
= batadv_orig_hash_find(bat_priv
,
892 if (batadv_dat_snoop_incoming_arp_request(bat_priv
, skb
,
895 if (batadv_dat_snoop_incoming_arp_reply(bat_priv
, skb
,
899 batadv_interface_rx(recv_if
->soft_iface
, skb
, recv_if
, hdr_size
,
904 batadv_orig_node_free_ref(orig_node
);
906 return NET_RX_SUCCESS
;
909 return batadv_route_unicast_packet(skb
, recv_if
);
913 * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets
914 * @skb: unicast tvlv packet to process
915 * @recv_if: pointer to interface this packet was received on
917 * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
920 int batadv_recv_unicast_tvlv(struct sk_buff
*skb
,
921 struct batadv_hard_iface
*recv_if
)
923 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
924 struct batadv_unicast_tvlv_packet
*unicast_tvlv_packet
;
925 unsigned char *tvlv_buff
;
927 int hdr_size
= sizeof(*unicast_tvlv_packet
);
928 int ret
= NET_RX_DROP
;
930 if (batadv_check_unicast_packet(bat_priv
, skb
, hdr_size
) < 0)
933 /* the header is likely to be modified while forwarding */
934 if (skb_cow(skb
, hdr_size
) < 0)
937 /* packet needs to be linearized to access the tvlv content */
938 if (skb_linearize(skb
) < 0)
941 unicast_tvlv_packet
= (struct batadv_unicast_tvlv_packet
*)skb
->data
;
943 tvlv_buff
= (unsigned char *)(skb
->data
+ hdr_size
);
944 tvlv_buff_len
= ntohs(unicast_tvlv_packet
->tvlv_len
);
946 if (tvlv_buff_len
> skb
->len
- hdr_size
)
949 ret
= batadv_tvlv_containers_process(bat_priv
, false, NULL
,
950 unicast_tvlv_packet
->src
,
951 unicast_tvlv_packet
->dst
,
952 tvlv_buff
, tvlv_buff_len
);
954 if (ret
!= NET_RX_SUCCESS
)
955 ret
= batadv_route_unicast_packet(skb
, recv_if
);
963 * batadv_recv_frag_packet - process received fragment
964 * @skb: the received fragment
965 * @recv_if: interface that the skb is received on
967 * This function does one of the three following things: 1) Forward fragment, if
968 * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till
969 * lack further fragments; 3) Merge fragments, if we have all needed parts.
971 * Return: NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise.
973 int batadv_recv_frag_packet(struct sk_buff
*skb
,
974 struct batadv_hard_iface
*recv_if
)
976 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
977 struct batadv_orig_node
*orig_node_src
= NULL
;
978 struct batadv_frag_packet
*frag_packet
;
979 int ret
= NET_RX_DROP
;
981 if (batadv_check_unicast_packet(bat_priv
, skb
,
982 sizeof(*frag_packet
)) < 0)
985 frag_packet
= (struct batadv_frag_packet
*)skb
->data
;
986 orig_node_src
= batadv_orig_hash_find(bat_priv
, frag_packet
->orig
);
990 /* Route the fragment if it is not for us and too big to be merged. */
991 if (!batadv_is_my_mac(bat_priv
, frag_packet
->dest
) &&
992 batadv_frag_skb_fwd(skb
, recv_if
, orig_node_src
)) {
993 ret
= NET_RX_SUCCESS
;
997 batadv_inc_counter(bat_priv
, BATADV_CNT_FRAG_RX
);
998 batadv_add_counter(bat_priv
, BATADV_CNT_FRAG_RX_BYTES
, skb
->len
);
1000 /* Add fragment to buffer and merge if possible. */
1001 if (!batadv_frag_skb_buffer(&skb
, orig_node_src
))
1004 /* Deliver merged packet to the appropriate handler, if it was
1008 batadv_batman_skb_recv(skb
, recv_if
->net_dev
,
1009 &recv_if
->batman_adv_ptype
, NULL
);
1011 ret
= NET_RX_SUCCESS
;
1015 batadv_orig_node_free_ref(orig_node_src
);
1020 int batadv_recv_bcast_packet(struct sk_buff
*skb
,
1021 struct batadv_hard_iface
*recv_if
)
1023 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1024 struct batadv_orig_node
*orig_node
= NULL
;
1025 struct batadv_bcast_packet
*bcast_packet
;
1026 struct ethhdr
*ethhdr
;
1027 int hdr_size
= sizeof(*bcast_packet
);
1028 int ret
= NET_RX_DROP
;
1032 /* drop packet if it has not necessary minimum size */
1033 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
1036 ethhdr
= eth_hdr(skb
);
1038 /* packet with broadcast indication but unicast recipient */
1039 if (!is_broadcast_ether_addr(ethhdr
->h_dest
))
1042 /* packet with broadcast sender address */
1043 if (is_broadcast_ether_addr(ethhdr
->h_source
))
1046 /* ignore broadcasts sent by myself */
1047 if (batadv_is_my_mac(bat_priv
, ethhdr
->h_source
))
1050 bcast_packet
= (struct batadv_bcast_packet
*)skb
->data
;
1052 /* ignore broadcasts originated by myself */
1053 if (batadv_is_my_mac(bat_priv
, bcast_packet
->orig
))
1056 if (bcast_packet
->ttl
< 2)
1059 orig_node
= batadv_orig_hash_find(bat_priv
, bcast_packet
->orig
);
1064 spin_lock_bh(&orig_node
->bcast_seqno_lock
);
1066 seqno
= ntohl(bcast_packet
->seqno
);
1067 /* check whether the packet is a duplicate */
1068 if (batadv_test_bit(orig_node
->bcast_bits
, orig_node
->last_bcast_seqno
,
1072 seq_diff
= seqno
- orig_node
->last_bcast_seqno
;
1074 /* check whether the packet is old and the host just restarted. */
1075 if (batadv_window_protected(bat_priv
, seq_diff
,
1076 &orig_node
->bcast_seqno_reset
))
1079 /* mark broadcast in flood history, update window position
1082 if (batadv_bit_get_packet(bat_priv
, orig_node
->bcast_bits
, seq_diff
, 1))
1083 orig_node
->last_bcast_seqno
= seqno
;
1085 spin_unlock_bh(&orig_node
->bcast_seqno_lock
);
1087 /* check whether this has been sent by another originator before */
1088 if (batadv_bla_check_bcast_duplist(bat_priv
, skb
))
1091 batadv_skb_set_priority(skb
, sizeof(struct batadv_bcast_packet
));
1093 /* rebroadcast packet */
1094 batadv_add_bcast_packet_to_list(bat_priv
, skb
, 1);
1096 /* don't hand the broadcast up if it is from an originator
1097 * from the same backbone.
1099 if (batadv_bla_is_backbone_gw(skb
, orig_node
, hdr_size
))
1102 if (batadv_dat_snoop_incoming_arp_request(bat_priv
, skb
, hdr_size
))
1104 if (batadv_dat_snoop_incoming_arp_reply(bat_priv
, skb
, hdr_size
))
1107 /* broadcast for me */
1108 batadv_interface_rx(recv_if
->soft_iface
, skb
, recv_if
, hdr_size
,
1112 ret
= NET_RX_SUCCESS
;
1116 spin_unlock_bh(&orig_node
->bcast_seqno_lock
);
1119 batadv_orig_node_free_ref(orig_node
);