1 /* Copyright (C) 2007-2013 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 "soft-interface.h"
22 #include "hard-interface.h"
23 #include "icmp_socket.h"
24 #include "translation-table.h"
25 #include "originator.h"
26 #include "bridge_loop_avoidance.h"
27 #include "distributed-arp-table.h"
28 #include "network-coding.h"
29 #include "fragmentation.h"
31 #include <linux/if_vlan.h>
33 static int batadv_route_unicast_packet(struct sk_buff
*skb
,
34 struct batadv_hard_iface
*recv_if
);
36 static void _batadv_update_route(struct batadv_priv
*bat_priv
,
37 struct batadv_orig_node
*orig_node
,
38 struct batadv_neigh_node
*neigh_node
)
40 struct batadv_neigh_node
*curr_router
;
42 curr_router
= batadv_orig_node_get_router(orig_node
);
45 if ((curr_router
) && (!neigh_node
)) {
46 batadv_dbg(BATADV_DBG_ROUTES
, bat_priv
,
47 "Deleting route towards: %pM\n", orig_node
->orig
);
48 batadv_tt_global_del_orig(bat_priv
, orig_node
, -1,
49 "Deleted route towards originator");
52 } else if ((!curr_router
) && (neigh_node
)) {
53 batadv_dbg(BATADV_DBG_ROUTES
, bat_priv
,
54 "Adding route towards: %pM (via %pM)\n",
55 orig_node
->orig
, neigh_node
->addr
);
57 } else if (neigh_node
&& curr_router
) {
58 batadv_dbg(BATADV_DBG_ROUTES
, bat_priv
,
59 "Changing route towards: %pM (now via %pM - was via %pM)\n",
60 orig_node
->orig
, neigh_node
->addr
,
65 batadv_neigh_node_free_ref(curr_router
);
67 /* increase refcount of new best neighbor */
68 if (neigh_node
&& !atomic_inc_not_zero(&neigh_node
->refcount
))
71 spin_lock_bh(&orig_node
->neigh_list_lock
);
72 rcu_assign_pointer(orig_node
->router
, neigh_node
);
73 spin_unlock_bh(&orig_node
->neigh_list_lock
);
75 /* decrease refcount of previous best neighbor */
77 batadv_neigh_node_free_ref(curr_router
);
80 void batadv_update_route(struct batadv_priv
*bat_priv
,
81 struct batadv_orig_node
*orig_node
,
82 struct batadv_neigh_node
*neigh_node
)
84 struct batadv_neigh_node
*router
= NULL
;
89 router
= batadv_orig_node_get_router(orig_node
);
91 if (router
!= neigh_node
)
92 _batadv_update_route(bat_priv
, orig_node
, neigh_node
);
96 batadv_neigh_node_free_ref(router
);
99 /* caller must hold the neigh_list_lock */
100 void batadv_bonding_candidate_del(struct batadv_orig_node
*orig_node
,
101 struct batadv_neigh_node
*neigh_node
)
103 /* this neighbor is not part of our candidate list */
104 if (list_empty(&neigh_node
->bonding_list
))
107 list_del_rcu(&neigh_node
->bonding_list
);
108 INIT_LIST_HEAD(&neigh_node
->bonding_list
);
109 batadv_neigh_node_free_ref(neigh_node
);
110 atomic_dec(&orig_node
->bond_candidates
);
117 * batadv_bonding_candidate_add - consider a new link for bonding mode towards
118 * the given originator
119 * @bat_priv: the bat priv with all the soft interface information
120 * @orig_node: the target node
121 * @neigh_node: the neighbor representing the new link to consider for bonding
124 void batadv_bonding_candidate_add(struct batadv_priv
*bat_priv
,
125 struct batadv_orig_node
*orig_node
,
126 struct batadv_neigh_node
*neigh_node
)
128 struct batadv_algo_ops
*bao
= bat_priv
->bat_algo_ops
;
129 struct batadv_neigh_node
*tmp_neigh_node
, *router
= NULL
;
130 uint8_t interference_candidate
= 0;
132 spin_lock_bh(&orig_node
->neigh_list_lock
);
134 /* only consider if it has the same primary address ... */
135 if (!batadv_compare_eth(orig_node
->orig
,
136 neigh_node
->orig_node
->primary_addr
))
139 router
= batadv_orig_node_get_router(orig_node
);
144 /* ... and is good enough to be considered */
145 if (bao
->bat_neigh_is_equiv_or_better(neigh_node
, router
))
148 /* check if we have another candidate with the same mac address or
149 * interface. If we do, we won't select this candidate because of
150 * possible interference.
152 hlist_for_each_entry_rcu(tmp_neigh_node
,
153 &orig_node
->neigh_list
, list
) {
154 if (tmp_neigh_node
== neigh_node
)
157 /* we only care if the other candidate is even
158 * considered as candidate.
160 if (list_empty(&tmp_neigh_node
->bonding_list
))
163 if ((neigh_node
->if_incoming
== tmp_neigh_node
->if_incoming
) ||
164 (batadv_compare_eth(neigh_node
->addr
,
165 tmp_neigh_node
->addr
))) {
166 interference_candidate
= 1;
171 /* don't care further if it is an interference candidate */
172 if (interference_candidate
)
175 /* this neighbor already is part of our candidate list */
176 if (!list_empty(&neigh_node
->bonding_list
))
179 if (!atomic_inc_not_zero(&neigh_node
->refcount
))
182 list_add_rcu(&neigh_node
->bonding_list
, &orig_node
->bond_list
);
183 atomic_inc(&orig_node
->bond_candidates
);
187 batadv_bonding_candidate_del(orig_node
, neigh_node
);
190 spin_unlock_bh(&orig_node
->neigh_list_lock
);
193 batadv_neigh_node_free_ref(router
);
196 /* copy primary address for bonding */
198 batadv_bonding_save_primary(const struct batadv_orig_node
*orig_node
,
199 struct batadv_orig_node
*orig_neigh_node
,
200 const struct batadv_ogm_packet
*batman_ogm_packet
)
202 if (!(batman_ogm_packet
->flags
& BATADV_PRIMARIES_FIRST_HOP
))
205 memcpy(orig_neigh_node
->primary_addr
, orig_node
->orig
, ETH_ALEN
);
208 /* checks whether the host restarted and is in the protection time.
210 * 0 if the packet is to be accepted
211 * 1 if the packet is to be ignored.
213 int batadv_window_protected(struct batadv_priv
*bat_priv
, int32_t seq_num_diff
,
214 unsigned long *last_reset
)
216 if (seq_num_diff
<= -BATADV_TQ_LOCAL_WINDOW_SIZE
||
217 seq_num_diff
>= BATADV_EXPECTED_SEQNO_RANGE
) {
218 if (!batadv_has_timed_out(*last_reset
,
219 BATADV_RESET_PROTECTION_MS
))
222 *last_reset
= jiffies
;
223 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
224 "old packet received, start protection\n");
230 bool batadv_check_management_packet(struct sk_buff
*skb
,
231 struct batadv_hard_iface
*hard_iface
,
234 struct ethhdr
*ethhdr
;
236 /* drop packet if it has not necessary minimum size */
237 if (unlikely(!pskb_may_pull(skb
, header_len
)))
240 ethhdr
= eth_hdr(skb
);
242 /* packet with broadcast indication but unicast recipient */
243 if (!is_broadcast_ether_addr(ethhdr
->h_dest
))
246 /* packet with broadcast sender address */
247 if (is_broadcast_ether_addr(ethhdr
->h_source
))
250 /* create a copy of the skb, if needed, to modify it. */
251 if (skb_cow(skb
, 0) < 0)
254 /* keep skb linear */
255 if (skb_linearize(skb
) < 0)
262 * batadv_recv_my_icmp_packet - receive an icmp packet locally
263 * @bat_priv: the bat priv with all the soft interface information
264 * @skb: icmp packet to process
266 * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
269 static int batadv_recv_my_icmp_packet(struct batadv_priv
*bat_priv
,
272 struct batadv_hard_iface
*primary_if
= NULL
;
273 struct batadv_orig_node
*orig_node
= NULL
;
274 struct batadv_icmp_header
*icmph
;
275 int res
, ret
= NET_RX_DROP
;
277 icmph
= (struct batadv_icmp_header
*)skb
->data
;
279 switch (icmph
->msg_type
) {
280 case BATADV_ECHO_REPLY
:
281 case BATADV_DESTINATION_UNREACHABLE
:
282 case BATADV_TTL_EXCEEDED
:
283 /* receive the packet */
284 if (skb_linearize(skb
) < 0)
287 batadv_socket_receive_packet(icmph
, skb
->len
);
289 case BATADV_ECHO_REQUEST
:
290 /* answer echo request (ping) */
291 primary_if
= batadv_primary_if_get_selected(bat_priv
);
295 /* get routing information */
296 orig_node
= batadv_orig_hash_find(bat_priv
, icmph
->orig
);
300 /* create a copy of the skb, if needed, to modify it. */
301 if (skb_cow(skb
, ETH_HLEN
) < 0)
304 icmph
= (struct batadv_icmp_header
*)skb
->data
;
306 memcpy(icmph
->dst
, icmph
->orig
, ETH_ALEN
);
307 memcpy(icmph
->orig
, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
308 icmph
->msg_type
= BATADV_ECHO_REPLY
;
309 icmph
->ttl
= BATADV_TTL
;
311 res
= batadv_send_skb_to_orig(skb
, orig_node
, NULL
);
312 if (res
!= NET_XMIT_DROP
)
313 ret
= NET_RX_SUCCESS
;
317 /* drop unknown type */
322 batadv_hardif_free_ref(primary_if
);
324 batadv_orig_node_free_ref(orig_node
);
328 static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv
*bat_priv
,
331 struct batadv_hard_iface
*primary_if
= NULL
;
332 struct batadv_orig_node
*orig_node
= NULL
;
333 struct batadv_icmp_packet
*icmp_packet
;
334 int ret
= NET_RX_DROP
;
336 icmp_packet
= (struct batadv_icmp_packet
*)skb
->data
;
338 /* send TTL exceeded if packet is an echo request (traceroute) */
339 if (icmp_packet
->msg_type
!= BATADV_ECHO_REQUEST
) {
340 pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n",
341 icmp_packet
->orig
, icmp_packet
->dst
);
345 primary_if
= batadv_primary_if_get_selected(bat_priv
);
349 /* get routing information */
350 orig_node
= batadv_orig_hash_find(bat_priv
, icmp_packet
->orig
);
354 /* create a copy of the skb, if needed, to modify it. */
355 if (skb_cow(skb
, ETH_HLEN
) < 0)
358 icmp_packet
= (struct batadv_icmp_packet
*)skb
->data
;
360 memcpy(icmp_packet
->dst
, icmp_packet
->orig
, ETH_ALEN
);
361 memcpy(icmp_packet
->orig
, primary_if
->net_dev
->dev_addr
,
363 icmp_packet
->msg_type
= BATADV_TTL_EXCEEDED
;
364 icmp_packet
->ttl
= BATADV_TTL
;
366 if (batadv_send_skb_to_orig(skb
, orig_node
, NULL
) != NET_XMIT_DROP
)
367 ret
= NET_RX_SUCCESS
;
371 batadv_hardif_free_ref(primary_if
);
373 batadv_orig_node_free_ref(orig_node
);
378 int batadv_recv_icmp_packet(struct sk_buff
*skb
,
379 struct batadv_hard_iface
*recv_if
)
381 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
382 struct batadv_icmp_header
*icmph
;
383 struct batadv_icmp_packet_rr
*icmp_packet_rr
;
384 struct ethhdr
*ethhdr
;
385 struct batadv_orig_node
*orig_node
= NULL
;
386 int hdr_size
= sizeof(struct batadv_icmp_header
);
387 int ret
= NET_RX_DROP
;
389 /* drop packet if it has not necessary minimum size */
390 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
393 ethhdr
= eth_hdr(skb
);
395 /* packet with unicast indication but broadcast recipient */
396 if (is_broadcast_ether_addr(ethhdr
->h_dest
))
399 /* packet with broadcast sender address */
400 if (is_broadcast_ether_addr(ethhdr
->h_source
))
404 if (!batadv_is_my_mac(bat_priv
, ethhdr
->h_dest
))
407 icmph
= (struct batadv_icmp_header
*)skb
->data
;
409 /* add record route information if not full */
410 if ((icmph
->msg_type
== BATADV_ECHO_REPLY
||
411 icmph
->msg_type
== BATADV_ECHO_REQUEST
) &&
412 (skb
->len
>= sizeof(struct batadv_icmp_packet_rr
))) {
413 if (skb_linearize(skb
) < 0)
416 /* create a copy of the skb, if needed, to modify it. */
417 if (skb_cow(skb
, ETH_HLEN
) < 0)
420 icmph
= (struct batadv_icmp_header
*)skb
->data
;
421 icmp_packet_rr
= (struct batadv_icmp_packet_rr
*)icmph
;
422 if (icmp_packet_rr
->rr_cur
>= BATADV_RR_LEN
)
425 memcpy(&(icmp_packet_rr
->rr
[icmp_packet_rr
->rr_cur
]),
426 ethhdr
->h_dest
, ETH_ALEN
);
427 icmp_packet_rr
->rr_cur
++;
431 if (batadv_is_my_mac(bat_priv
, icmph
->dst
))
432 return batadv_recv_my_icmp_packet(bat_priv
, skb
);
436 return batadv_recv_icmp_ttl_exceeded(bat_priv
, skb
);
438 /* get routing information */
439 orig_node
= batadv_orig_hash_find(bat_priv
, icmph
->dst
);
443 /* create a copy of the skb, if needed, to modify it. */
444 if (skb_cow(skb
, ETH_HLEN
) < 0)
447 icmph
= (struct batadv_icmp_header
*)skb
->data
;
453 if (batadv_send_skb_to_orig(skb
, orig_node
, recv_if
) != NET_XMIT_DROP
)
454 ret
= NET_RX_SUCCESS
;
458 batadv_orig_node_free_ref(orig_node
);
462 /* In the bonding case, send the packets in a round
463 * robin fashion over the remaining interfaces.
465 * This method rotates the bonding list and increases the
466 * returned router's refcount.
468 static struct batadv_neigh_node
*
469 batadv_find_bond_router(struct batadv_orig_node
*primary_orig
,
470 const struct batadv_hard_iface
*recv_if
)
472 struct batadv_neigh_node
*tmp_neigh_node
;
473 struct batadv_neigh_node
*router
= NULL
, *first_candidate
= NULL
;
476 list_for_each_entry_rcu(tmp_neigh_node
, &primary_orig
->bond_list
,
478 if (!first_candidate
)
479 first_candidate
= tmp_neigh_node
;
481 /* recv_if == NULL on the first node. */
482 if (tmp_neigh_node
->if_incoming
== recv_if
)
485 if (!atomic_inc_not_zero(&tmp_neigh_node
->refcount
))
488 router
= tmp_neigh_node
;
492 /* use the first candidate if nothing was found. */
493 if (!router
&& first_candidate
&&
494 atomic_inc_not_zero(&first_candidate
->refcount
))
495 router
= first_candidate
;
500 /* selected should point to the next element
501 * after the current router
503 spin_lock_bh(&primary_orig
->neigh_list_lock
);
504 /* this is a list_move(), which unfortunately
505 * does not exist as rcu version
507 list_del_rcu(&primary_orig
->bond_list
);
508 list_add_rcu(&primary_orig
->bond_list
,
509 &router
->bonding_list
);
510 spin_unlock_bh(&primary_orig
->neigh_list_lock
);
518 * batadv_find_ifalter_router - find the best of the remaining candidates which
519 * are not using this interface
520 * @bat_priv: the bat priv with all the soft interface information
521 * @primary_orig: the destination
522 * @recv_if: the interface that the router returned by this function has to not
525 * Returns the best candidate towards primary_orig that is not using recv_if.
526 * Increases the returned neighbor's refcount
528 static struct batadv_neigh_node
*
529 batadv_find_ifalter_router(struct batadv_priv
*bat_priv
,
530 struct batadv_orig_node
*primary_orig
,
531 const struct batadv_hard_iface
*recv_if
)
533 struct batadv_neigh_node
*router
= NULL
, *first_candidate
= NULL
;
534 struct batadv_algo_ops
*bao
= bat_priv
->bat_algo_ops
;
535 struct batadv_neigh_node
*tmp_neigh_node
;
538 list_for_each_entry_rcu(tmp_neigh_node
, &primary_orig
->bond_list
,
540 if (!first_candidate
)
541 first_candidate
= tmp_neigh_node
;
543 /* recv_if == NULL on the first node. */
544 if (tmp_neigh_node
->if_incoming
== recv_if
)
547 if (router
&& bao
->bat_neigh_cmp(tmp_neigh_node
, router
))
550 if (!atomic_inc_not_zero(&tmp_neigh_node
->refcount
))
553 /* decrement refcount of previously selected router */
555 batadv_neigh_node_free_ref(router
);
557 /* we found a better router (or at least one valid router) */
558 router
= tmp_neigh_node
;
561 /* use the first candidate if nothing was found. */
562 if (!router
&& first_candidate
&&
563 atomic_inc_not_zero(&first_candidate
->refcount
))
564 router
= first_candidate
;
571 * batadv_check_unicast_packet - Check for malformed unicast packets
572 * @bat_priv: the bat priv with all the soft interface information
573 * @skb: packet to check
574 * @hdr_size: size of header to pull
576 * Check for short header and bad addresses in given packet. Returns negative
577 * value when check fails and 0 otherwise. The negative value depends on the
578 * reason: -ENODATA for bad header, -EBADR for broadcast destination or source,
579 * and -EREMOTE for non-local (other host) destination.
581 static int batadv_check_unicast_packet(struct batadv_priv
*bat_priv
,
582 struct sk_buff
*skb
, int hdr_size
)
584 struct ethhdr
*ethhdr
;
586 /* drop packet if it has not necessary minimum size */
587 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
590 ethhdr
= eth_hdr(skb
);
592 /* packet with unicast indication but broadcast recipient */
593 if (is_broadcast_ether_addr(ethhdr
->h_dest
))
596 /* packet with broadcast sender address */
597 if (is_broadcast_ether_addr(ethhdr
->h_source
))
601 if (!batadv_is_my_mac(bat_priv
, ethhdr
->h_dest
))
607 /* find a suitable router for this originator, and use
608 * bonding if possible. increases the found neighbors
611 struct batadv_neigh_node
*
612 batadv_find_router(struct batadv_priv
*bat_priv
,
613 struct batadv_orig_node
*orig_node
,
614 const struct batadv_hard_iface
*recv_if
)
616 struct batadv_orig_node
*primary_orig_node
;
617 struct batadv_orig_node
*router_orig
;
618 struct batadv_neigh_node
*router
;
619 static uint8_t zero_mac
[ETH_ALEN
] = {0, 0, 0, 0, 0, 0};
621 uint8_t *primary_addr
;
626 router
= batadv_orig_node_get_router(orig_node
);
630 /* without bonding, the first node should
631 * always choose the default router.
633 bonding_enabled
= atomic_read(&bat_priv
->bonding
);
636 /* select default router to output */
637 router_orig
= router
->orig_node
;
641 if ((!recv_if
) && (!bonding_enabled
))
644 primary_addr
= router_orig
->primary_addr
;
646 /* if we have something in the primary_addr, we can search
647 * for a potential bonding candidate.
649 if (batadv_compare_eth(primary_addr
, zero_mac
))
652 /* find the orig_node which has the primary interface. might
653 * even be the same as our router_orig in many cases
655 if (batadv_compare_eth(primary_addr
, router_orig
->orig
)) {
656 primary_orig_node
= router_orig
;
658 primary_orig_node
= batadv_orig_hash_find(bat_priv
,
660 if (!primary_orig_node
)
663 batadv_orig_node_free_ref(primary_orig_node
);
666 /* with less than 2 candidates, we can't do any
667 * bonding and prefer the original router.
669 if (atomic_read(&primary_orig_node
->bond_candidates
) < 2)
672 /* all nodes between should choose a candidate which
673 * is is not on the interface where the packet came
676 batadv_neigh_node_free_ref(router
);
679 router
= batadv_find_bond_router(primary_orig_node
, recv_if
);
681 router
= batadv_find_ifalter_router(bat_priv
, primary_orig_node
,
685 if (router
&& router
->if_incoming
->if_status
!= BATADV_IF_ACTIVE
)
694 batadv_neigh_node_free_ref(router
);
698 static int batadv_route_unicast_packet(struct sk_buff
*skb
,
699 struct batadv_hard_iface
*recv_if
)
701 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
702 struct batadv_orig_node
*orig_node
= NULL
;
703 struct batadv_unicast_packet
*unicast_packet
;
704 struct ethhdr
*ethhdr
= eth_hdr(skb
);
705 int res
, hdr_len
, ret
= NET_RX_DROP
;
707 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
710 if (unicast_packet
->ttl
< 2) {
711 pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n",
712 ethhdr
->h_source
, unicast_packet
->dest
);
716 /* get routing information */
717 orig_node
= batadv_orig_hash_find(bat_priv
, unicast_packet
->dest
);
722 /* create a copy of the skb, if needed, to modify it. */
723 if (skb_cow(skb
, ETH_HLEN
) < 0)
727 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
728 unicast_packet
->ttl
--;
730 switch (unicast_packet
->packet_type
) {
731 case BATADV_UNICAST_4ADDR
:
732 hdr_len
= sizeof(struct batadv_unicast_4addr_packet
);
735 hdr_len
= sizeof(struct batadv_unicast_packet
);
738 /* other packet types not supported - yet */
744 batadv_skb_set_priority(skb
, hdr_len
);
746 res
= batadv_send_skb_to_orig(skb
, orig_node
, recv_if
);
748 /* translate transmit result into receive result */
749 if (res
== NET_XMIT_SUCCESS
) {
750 /* skb was transmitted and consumed */
751 batadv_inc_counter(bat_priv
, BATADV_CNT_FORWARD
);
752 batadv_add_counter(bat_priv
, BATADV_CNT_FORWARD_BYTES
,
753 skb
->len
+ ETH_HLEN
);
755 ret
= NET_RX_SUCCESS
;
756 } else if (res
== NET_XMIT_POLICED
) {
757 /* skb was buffered and consumed */
758 ret
= NET_RX_SUCCESS
;
763 batadv_orig_node_free_ref(orig_node
);
768 * batadv_reroute_unicast_packet - update the unicast header for re-routing
769 * @bat_priv: the bat priv with all the soft interface information
770 * @unicast_packet: the unicast header to be updated
771 * @dst_addr: the payload destination
772 * @vid: VLAN identifier
774 * Search the translation table for dst_addr and update the unicast header with
775 * the new corresponding information (originator address where the destination
776 * client currently is and its known TTVN)
778 * Returns true if the packet header has been updated, false otherwise
781 batadv_reroute_unicast_packet(struct batadv_priv
*bat_priv
,
782 struct batadv_unicast_packet
*unicast_packet
,
783 uint8_t *dst_addr
, unsigned short vid
)
785 struct batadv_orig_node
*orig_node
= NULL
;
786 struct batadv_hard_iface
*primary_if
= NULL
;
788 uint8_t *orig_addr
, orig_ttvn
;
790 if (batadv_is_my_client(bat_priv
, dst_addr
, vid
)) {
791 primary_if
= batadv_primary_if_get_selected(bat_priv
);
794 orig_addr
= primary_if
->net_dev
->dev_addr
;
795 orig_ttvn
= (uint8_t)atomic_read(&bat_priv
->tt
.vn
);
797 orig_node
= batadv_transtable_search(bat_priv
, NULL
, dst_addr
,
802 if (batadv_compare_eth(orig_node
->orig
, unicast_packet
->dest
))
805 orig_addr
= orig_node
->orig
;
806 orig_ttvn
= (uint8_t)atomic_read(&orig_node
->last_ttvn
);
809 /* update the packet header */
810 memcpy(unicast_packet
->dest
, orig_addr
, ETH_ALEN
);
811 unicast_packet
->ttvn
= orig_ttvn
;
816 batadv_hardif_free_ref(primary_if
);
818 batadv_orig_node_free_ref(orig_node
);
823 static int batadv_check_unicast_ttvn(struct batadv_priv
*bat_priv
,
824 struct sk_buff
*skb
, int hdr_len
) {
825 struct batadv_unicast_packet
*unicast_packet
;
826 struct batadv_hard_iface
*primary_if
;
827 struct batadv_orig_node
*orig_node
;
828 uint8_t curr_ttvn
, old_ttvn
;
829 struct ethhdr
*ethhdr
;
833 /* check if there is enough data before accessing it */
834 if (pskb_may_pull(skb
, hdr_len
+ ETH_HLEN
) < 0)
837 /* create a copy of the skb (in case of for re-routing) to modify it. */
838 if (skb_cow(skb
, sizeof(*unicast_packet
)) < 0)
841 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
842 vid
= batadv_get_vid(skb
, hdr_len
);
843 ethhdr
= (struct ethhdr
*)(skb
->data
+ hdr_len
);
845 /* check if the destination client was served by this node and it is now
846 * roaming. In this case, it means that the node has got a ROAM_ADV
847 * message and that it knows the new destination in the mesh to re-route
850 if (batadv_tt_local_client_is_roaming(bat_priv
, ethhdr
->h_dest
, vid
)) {
851 if (batadv_reroute_unicast_packet(bat_priv
, unicast_packet
,
852 ethhdr
->h_dest
, vid
))
853 net_ratelimited_function(batadv_dbg
, BATADV_DBG_TT
,
855 "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n",
856 unicast_packet
->dest
,
858 /* at this point the mesh destination should have been
859 * substituted with the originator address found in the global
860 * table. If not, let the packet go untouched anyway because
861 * there is nothing the node can do
866 /* retrieve the TTVN known by this node for the packet destination. This
867 * value is used later to check if the node which sent (or re-routed
868 * last time) the packet had an updated information or not
870 curr_ttvn
= (uint8_t)atomic_read(&bat_priv
->tt
.vn
);
871 if (!batadv_is_my_mac(bat_priv
, unicast_packet
->dest
)) {
872 orig_node
= batadv_orig_hash_find(bat_priv
,
873 unicast_packet
->dest
);
874 /* if it is not possible to find the orig_node representing the
875 * destination, the packet can immediately be dropped as it will
876 * not be possible to deliver it
881 curr_ttvn
= (uint8_t)atomic_read(&orig_node
->last_ttvn
);
882 batadv_orig_node_free_ref(orig_node
);
885 /* check if the TTVN contained in the packet is fresher than what the
888 is_old_ttvn
= batadv_seq_before(unicast_packet
->ttvn
, curr_ttvn
);
892 old_ttvn
= unicast_packet
->ttvn
;
893 /* the packet was forged based on outdated network information. Its
894 * destination can possibly be updated and forwarded towards the new
897 if (batadv_reroute_unicast_packet(bat_priv
, unicast_packet
,
898 ethhdr
->h_dest
, vid
)) {
899 net_ratelimited_function(batadv_dbg
, BATADV_DBG_TT
, bat_priv
,
900 "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n",
901 unicast_packet
->dest
, ethhdr
->h_dest
,
902 old_ttvn
, curr_ttvn
);
906 /* the packet has not been re-routed: either the destination is
907 * currently served by this node or there is no destination at all and
908 * it is possible to drop the packet
910 if (!batadv_is_my_client(bat_priv
, ethhdr
->h_dest
, vid
))
913 /* update the header in order to let the packet be delivered to this
914 * node's soft interface
916 primary_if
= batadv_primary_if_get_selected(bat_priv
);
920 memcpy(unicast_packet
->dest
, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
922 batadv_hardif_free_ref(primary_if
);
924 unicast_packet
->ttvn
= curr_ttvn
;
930 * batadv_recv_unhandled_unicast_packet - receive and process packets which
931 * are in the unicast number space but not yet known to the implementation
932 * @skb: unicast tvlv packet to process
933 * @recv_if: pointer to interface this packet was received on
935 * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
938 int batadv_recv_unhandled_unicast_packet(struct sk_buff
*skb
,
939 struct batadv_hard_iface
*recv_if
)
941 struct batadv_unicast_packet
*unicast_packet
;
942 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
943 int check
, hdr_size
= sizeof(*unicast_packet
);
945 check
= batadv_check_unicast_packet(bat_priv
, skb
, hdr_size
);
949 /* we don't know about this type, drop it. */
950 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
951 if (batadv_is_my_mac(bat_priv
, unicast_packet
->dest
))
954 return batadv_route_unicast_packet(skb
, recv_if
);
957 int batadv_recv_unicast_packet(struct sk_buff
*skb
,
958 struct batadv_hard_iface
*recv_if
)
960 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
961 struct batadv_unicast_packet
*unicast_packet
;
962 struct batadv_unicast_4addr_packet
*unicast_4addr_packet
;
964 struct batadv_orig_node
*orig_node
= NULL
;
965 int check
, hdr_size
= sizeof(*unicast_packet
);
968 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
969 unicast_4addr_packet
= (struct batadv_unicast_4addr_packet
*)skb
->data
;
971 is4addr
= unicast_packet
->packet_type
== BATADV_UNICAST_4ADDR
;
972 /* the caller function should have already pulled 2 bytes */
974 hdr_size
= sizeof(*unicast_4addr_packet
);
976 /* function returns -EREMOTE for promiscuous packets */
977 check
= batadv_check_unicast_packet(bat_priv
, skb
, hdr_size
);
979 /* Even though the packet is not for us, we might save it to use for
980 * decoding a later received coded packet
982 if (check
== -EREMOTE
)
983 batadv_nc_skb_store_sniffed_unicast(bat_priv
, skb
);
987 if (!batadv_check_unicast_ttvn(bat_priv
, skb
, hdr_size
))
991 if (batadv_is_my_mac(bat_priv
, unicast_packet
->dest
)) {
993 batadv_dat_inc_counter(bat_priv
,
994 unicast_4addr_packet
->subtype
);
995 orig_addr
= unicast_4addr_packet
->src
;
996 orig_node
= batadv_orig_hash_find(bat_priv
, orig_addr
);
999 if (batadv_dat_snoop_incoming_arp_request(bat_priv
, skb
,
1002 if (batadv_dat_snoop_incoming_arp_reply(bat_priv
, skb
,
1006 batadv_interface_rx(recv_if
->soft_iface
, skb
, recv_if
, hdr_size
,
1011 batadv_orig_node_free_ref(orig_node
);
1013 return NET_RX_SUCCESS
;
1016 return batadv_route_unicast_packet(skb
, recv_if
);
1020 * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets
1021 * @skb: unicast tvlv packet to process
1022 * @recv_if: pointer to interface this packet was received on
1023 * @dst_addr: the payload destination
1025 * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
1028 int batadv_recv_unicast_tvlv(struct sk_buff
*skb
,
1029 struct batadv_hard_iface
*recv_if
)
1031 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1032 struct batadv_unicast_tvlv_packet
*unicast_tvlv_packet
;
1033 unsigned char *tvlv_buff
;
1034 uint16_t tvlv_buff_len
;
1035 int hdr_size
= sizeof(*unicast_tvlv_packet
);
1036 int ret
= NET_RX_DROP
;
1038 if (batadv_check_unicast_packet(bat_priv
, skb
, hdr_size
) < 0)
1041 /* the header is likely to be modified while forwarding */
1042 if (skb_cow(skb
, hdr_size
) < 0)
1045 /* packet needs to be linearized to access the tvlv content */
1046 if (skb_linearize(skb
) < 0)
1049 unicast_tvlv_packet
= (struct batadv_unicast_tvlv_packet
*)skb
->data
;
1051 tvlv_buff
= (unsigned char *)(skb
->data
+ hdr_size
);
1052 tvlv_buff_len
= ntohs(unicast_tvlv_packet
->tvlv_len
);
1054 if (tvlv_buff_len
> skb
->len
- hdr_size
)
1057 ret
= batadv_tvlv_containers_process(bat_priv
, false, NULL
,
1058 unicast_tvlv_packet
->src
,
1059 unicast_tvlv_packet
->dst
,
1060 tvlv_buff
, tvlv_buff_len
);
1062 if (ret
!= NET_RX_SUCCESS
)
1063 ret
= batadv_route_unicast_packet(skb
, recv_if
);
1069 * batadv_recv_frag_packet - process received fragment
1070 * @skb: the received fragment
1071 * @recv_if: interface that the skb is received on
1073 * This function does one of the three following things: 1) Forward fragment, if
1074 * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till
1075 * lack further fragments; 3) Merge fragments, if we have all needed parts.
1077 * Return NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise.
1079 int batadv_recv_frag_packet(struct sk_buff
*skb
,
1080 struct batadv_hard_iface
*recv_if
)
1082 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1083 struct batadv_orig_node
*orig_node_src
= NULL
;
1084 struct batadv_frag_packet
*frag_packet
;
1085 int ret
= NET_RX_DROP
;
1087 if (batadv_check_unicast_packet(bat_priv
, skb
,
1088 sizeof(*frag_packet
)) < 0)
1091 frag_packet
= (struct batadv_frag_packet
*)skb
->data
;
1092 orig_node_src
= batadv_orig_hash_find(bat_priv
, frag_packet
->orig
);
1096 /* Route the fragment if it is not for us and too big to be merged. */
1097 if (!batadv_is_my_mac(bat_priv
, frag_packet
->dest
) &&
1098 batadv_frag_skb_fwd(skb
, recv_if
, orig_node_src
)) {
1099 ret
= NET_RX_SUCCESS
;
1103 batadv_inc_counter(bat_priv
, BATADV_CNT_FRAG_RX
);
1104 batadv_add_counter(bat_priv
, BATADV_CNT_FRAG_RX_BYTES
, skb
->len
);
1106 /* Add fragment to buffer and merge if possible. */
1107 if (!batadv_frag_skb_buffer(&skb
, orig_node_src
))
1110 /* Deliver merged packet to the appropriate handler, if it was
1114 batadv_batman_skb_recv(skb
, recv_if
->net_dev
,
1115 &recv_if
->batman_adv_ptype
, NULL
);
1117 ret
= NET_RX_SUCCESS
;
1121 batadv_orig_node_free_ref(orig_node_src
);
1126 int batadv_recv_bcast_packet(struct sk_buff
*skb
,
1127 struct batadv_hard_iface
*recv_if
)
1129 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1130 struct batadv_orig_node
*orig_node
= NULL
;
1131 struct batadv_bcast_packet
*bcast_packet
;
1132 struct ethhdr
*ethhdr
;
1133 int hdr_size
= sizeof(*bcast_packet
);
1134 int ret
= NET_RX_DROP
;
1138 /* drop packet if it has not necessary minimum size */
1139 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
1142 ethhdr
= eth_hdr(skb
);
1144 /* packet with broadcast indication but unicast recipient */
1145 if (!is_broadcast_ether_addr(ethhdr
->h_dest
))
1148 /* packet with broadcast sender address */
1149 if (is_broadcast_ether_addr(ethhdr
->h_source
))
1152 /* ignore broadcasts sent by myself */
1153 if (batadv_is_my_mac(bat_priv
, ethhdr
->h_source
))
1156 bcast_packet
= (struct batadv_bcast_packet
*)skb
->data
;
1158 /* ignore broadcasts originated by myself */
1159 if (batadv_is_my_mac(bat_priv
, bcast_packet
->orig
))
1162 if (bcast_packet
->ttl
< 2)
1165 orig_node
= batadv_orig_hash_find(bat_priv
, bcast_packet
->orig
);
1170 spin_lock_bh(&orig_node
->bcast_seqno_lock
);
1172 seqno
= ntohl(bcast_packet
->seqno
);
1173 /* check whether the packet is a duplicate */
1174 if (batadv_test_bit(orig_node
->bcast_bits
, orig_node
->last_bcast_seqno
,
1178 seq_diff
= seqno
- orig_node
->last_bcast_seqno
;
1180 /* check whether the packet is old and the host just restarted. */
1181 if (batadv_window_protected(bat_priv
, seq_diff
,
1182 &orig_node
->bcast_seqno_reset
))
1185 /* mark broadcast in flood history, update window position
1188 if (batadv_bit_get_packet(bat_priv
, orig_node
->bcast_bits
, seq_diff
, 1))
1189 orig_node
->last_bcast_seqno
= seqno
;
1191 spin_unlock_bh(&orig_node
->bcast_seqno_lock
);
1193 /* check whether this has been sent by another originator before */
1194 if (batadv_bla_check_bcast_duplist(bat_priv
, skb
))
1197 batadv_skb_set_priority(skb
, sizeof(struct batadv_bcast_packet
));
1199 /* rebroadcast packet */
1200 batadv_add_bcast_packet_to_list(bat_priv
, skb
, 1);
1202 /* don't hand the broadcast up if it is from an originator
1203 * from the same backbone.
1205 if (batadv_bla_is_backbone_gw(skb
, orig_node
, hdr_size
))
1208 if (batadv_dat_snoop_incoming_arp_request(bat_priv
, skb
, hdr_size
))
1210 if (batadv_dat_snoop_incoming_arp_reply(bat_priv
, skb
, hdr_size
))
1213 /* broadcast for me */
1214 batadv_interface_rx(recv_if
->soft_iface
, skb
, recv_if
, hdr_size
,
1218 ret
= NET_RX_SUCCESS
;
1222 spin_unlock_bh(&orig_node
->bcast_seqno_lock
);
1225 batadv_orig_node_free_ref(orig_node
);