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, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
23 #include "soft-interface.h"
24 #include "hard-interface.h"
25 #include "icmp_socket.h"
26 #include "translation-table.h"
27 #include "originator.h"
30 #include "bridge_loop_avoidance.h"
31 #include "distributed-arp-table.h"
33 static int batadv_route_unicast_packet(struct sk_buff
*skb
,
34 struct batadv_hard_iface
*recv_if
);
36 void batadv_slide_own_bcast_window(struct batadv_hard_iface
*hard_iface
)
38 struct batadv_priv
*bat_priv
= netdev_priv(hard_iface
->soft_iface
);
39 struct batadv_hashtable
*hash
= bat_priv
->orig_hash
;
40 struct hlist_head
*head
;
41 struct batadv_orig_node
*orig_node
;
47 for (i
= 0; i
< hash
->size
; i
++) {
48 head
= &hash
->table
[i
];
51 hlist_for_each_entry_rcu(orig_node
, head
, hash_entry
) {
52 spin_lock_bh(&orig_node
->ogm_cnt_lock
);
53 word_index
= hard_iface
->if_num
* BATADV_NUM_WORDS
;
54 word
= &(orig_node
->bcast_own
[word_index
]);
56 batadv_bit_get_packet(bat_priv
, word
, 1, 0);
57 w
= &orig_node
->bcast_own_sum
[hard_iface
->if_num
];
58 *w
= bitmap_weight(word
, BATADV_TQ_LOCAL_WINDOW_SIZE
);
59 spin_unlock_bh(&orig_node
->ogm_cnt_lock
);
65 static void _batadv_update_route(struct batadv_priv
*bat_priv
,
66 struct batadv_orig_node
*orig_node
,
67 struct batadv_neigh_node
*neigh_node
)
69 struct batadv_neigh_node
*curr_router
;
71 curr_router
= batadv_orig_node_get_router(orig_node
);
74 if ((curr_router
) && (!neigh_node
)) {
75 batadv_dbg(BATADV_DBG_ROUTES
, bat_priv
,
76 "Deleting route towards: %pM\n", orig_node
->orig
);
77 batadv_tt_global_del_orig(bat_priv
, orig_node
,
78 "Deleted route towards originator");
81 } else if ((!curr_router
) && (neigh_node
)) {
82 batadv_dbg(BATADV_DBG_ROUTES
, bat_priv
,
83 "Adding route towards: %pM (via %pM)\n",
84 orig_node
->orig
, neigh_node
->addr
);
86 } else if (neigh_node
&& curr_router
) {
87 batadv_dbg(BATADV_DBG_ROUTES
, bat_priv
,
88 "Changing route towards: %pM (now via %pM - was via %pM)\n",
89 orig_node
->orig
, neigh_node
->addr
,
94 batadv_neigh_node_free_ref(curr_router
);
96 /* increase refcount of new best neighbor */
97 if (neigh_node
&& !atomic_inc_not_zero(&neigh_node
->refcount
))
100 spin_lock_bh(&orig_node
->neigh_list_lock
);
101 rcu_assign_pointer(orig_node
->router
, neigh_node
);
102 spin_unlock_bh(&orig_node
->neigh_list_lock
);
104 /* decrease refcount of previous best neighbor */
106 batadv_neigh_node_free_ref(curr_router
);
109 void batadv_update_route(struct batadv_priv
*bat_priv
,
110 struct batadv_orig_node
*orig_node
,
111 struct batadv_neigh_node
*neigh_node
)
113 struct batadv_neigh_node
*router
= NULL
;
118 router
= batadv_orig_node_get_router(orig_node
);
120 if (router
!= neigh_node
)
121 _batadv_update_route(bat_priv
, orig_node
, neigh_node
);
125 batadv_neigh_node_free_ref(router
);
128 /* caller must hold the neigh_list_lock */
129 void batadv_bonding_candidate_del(struct batadv_orig_node
*orig_node
,
130 struct batadv_neigh_node
*neigh_node
)
132 /* this neighbor is not part of our candidate list */
133 if (list_empty(&neigh_node
->bonding_list
))
136 list_del_rcu(&neigh_node
->bonding_list
);
137 INIT_LIST_HEAD(&neigh_node
->bonding_list
);
138 batadv_neigh_node_free_ref(neigh_node
);
139 atomic_dec(&orig_node
->bond_candidates
);
145 void batadv_bonding_candidate_add(struct batadv_orig_node
*orig_node
,
146 struct batadv_neigh_node
*neigh_node
)
148 struct batadv_neigh_node
*tmp_neigh_node
, *router
= NULL
;
149 uint8_t interference_candidate
= 0;
151 spin_lock_bh(&orig_node
->neigh_list_lock
);
153 /* only consider if it has the same primary address ... */
154 if (!batadv_compare_eth(orig_node
->orig
,
155 neigh_node
->orig_node
->primary_addr
))
158 router
= batadv_orig_node_get_router(orig_node
);
162 /* ... and is good enough to be considered */
163 if (neigh_node
->tq_avg
< router
->tq_avg
- BATADV_BONDING_TQ_THRESHOLD
)
166 /* check if we have another candidate with the same mac address or
167 * interface. If we do, we won't select this candidate because of
168 * possible interference.
170 hlist_for_each_entry_rcu(tmp_neigh_node
,
171 &orig_node
->neigh_list
, list
) {
172 if (tmp_neigh_node
== neigh_node
)
175 /* we only care if the other candidate is even
176 * considered as candidate.
178 if (list_empty(&tmp_neigh_node
->bonding_list
))
181 if ((neigh_node
->if_incoming
== tmp_neigh_node
->if_incoming
) ||
182 (batadv_compare_eth(neigh_node
->addr
,
183 tmp_neigh_node
->addr
))) {
184 interference_candidate
= 1;
189 /* don't care further if it is an interference candidate */
190 if (interference_candidate
)
193 /* this neighbor already is part of our candidate list */
194 if (!list_empty(&neigh_node
->bonding_list
))
197 if (!atomic_inc_not_zero(&neigh_node
->refcount
))
200 list_add_rcu(&neigh_node
->bonding_list
, &orig_node
->bond_list
);
201 atomic_inc(&orig_node
->bond_candidates
);
205 batadv_bonding_candidate_del(orig_node
, neigh_node
);
208 spin_unlock_bh(&orig_node
->neigh_list_lock
);
211 batadv_neigh_node_free_ref(router
);
214 /* copy primary address for bonding */
216 batadv_bonding_save_primary(const struct batadv_orig_node
*orig_node
,
217 struct batadv_orig_node
*orig_neigh_node
,
218 const struct batadv_ogm_packet
*batman_ogm_packet
)
220 if (!(batman_ogm_packet
->flags
& BATADV_PRIMARIES_FIRST_HOP
))
223 memcpy(orig_neigh_node
->primary_addr
, orig_node
->orig
, ETH_ALEN
);
226 /* checks whether the host restarted and is in the protection time.
228 * 0 if the packet is to be accepted
229 * 1 if the packet is to be ignored.
231 int batadv_window_protected(struct batadv_priv
*bat_priv
, int32_t seq_num_diff
,
232 unsigned long *last_reset
)
234 if (seq_num_diff
<= -BATADV_TQ_LOCAL_WINDOW_SIZE
||
235 seq_num_diff
>= BATADV_EXPECTED_SEQNO_RANGE
) {
236 if (!batadv_has_timed_out(*last_reset
,
237 BATADV_RESET_PROTECTION_MS
))
240 *last_reset
= jiffies
;
241 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
242 "old packet received, start protection\n");
248 bool batadv_check_management_packet(struct sk_buff
*skb
,
249 struct batadv_hard_iface
*hard_iface
,
252 struct ethhdr
*ethhdr
;
254 /* drop packet if it has not necessary minimum size */
255 if (unlikely(!pskb_may_pull(skb
, header_len
)))
258 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
260 /* packet with broadcast indication but unicast recipient */
261 if (!is_broadcast_ether_addr(ethhdr
->h_dest
))
264 /* packet with broadcast sender address */
265 if (is_broadcast_ether_addr(ethhdr
->h_source
))
268 /* create a copy of the skb, if needed, to modify it. */
269 if (skb_cow(skb
, 0) < 0)
272 /* keep skb linear */
273 if (skb_linearize(skb
) < 0)
279 static int batadv_recv_my_icmp_packet(struct batadv_priv
*bat_priv
,
280 struct sk_buff
*skb
, size_t icmp_len
)
282 struct batadv_hard_iface
*primary_if
= NULL
;
283 struct batadv_orig_node
*orig_node
= NULL
;
284 struct batadv_icmp_packet_rr
*icmp_packet
;
285 int ret
= NET_RX_DROP
;
287 icmp_packet
= (struct batadv_icmp_packet_rr
*)skb
->data
;
289 /* add data to device queue */
290 if (icmp_packet
->msg_type
!= BATADV_ECHO_REQUEST
) {
291 batadv_socket_receive_packet(icmp_packet
, icmp_len
);
295 primary_if
= batadv_primary_if_get_selected(bat_priv
);
299 /* answer echo request (ping) */
300 /* get routing information */
301 orig_node
= batadv_orig_hash_find(bat_priv
, icmp_packet
->orig
);
305 /* create a copy of the skb, if needed, to modify it. */
306 if (skb_cow(skb
, ETH_HLEN
) < 0)
309 icmp_packet
= (struct batadv_icmp_packet_rr
*)skb
->data
;
311 memcpy(icmp_packet
->dst
, icmp_packet
->orig
, ETH_ALEN
);
312 memcpy(icmp_packet
->orig
, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
313 icmp_packet
->msg_type
= BATADV_ECHO_REPLY
;
314 icmp_packet
->header
.ttl
= BATADV_TTL
;
316 if (batadv_send_skb_to_orig(skb
, orig_node
, NULL
))
317 ret
= NET_RX_SUCCESS
;
321 batadv_hardif_free_ref(primary_if
);
323 batadv_orig_node_free_ref(orig_node
);
327 static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv
*bat_priv
,
330 struct batadv_hard_iface
*primary_if
= NULL
;
331 struct batadv_orig_node
*orig_node
= NULL
;
332 struct batadv_icmp_packet
*icmp_packet
;
333 int ret
= NET_RX_DROP
;
335 icmp_packet
= (struct batadv_icmp_packet
*)skb
->data
;
337 /* send TTL exceeded if packet is an echo request (traceroute) */
338 if (icmp_packet
->msg_type
!= BATADV_ECHO_REQUEST
) {
339 pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n",
340 icmp_packet
->orig
, icmp_packet
->dst
);
344 primary_if
= batadv_primary_if_get_selected(bat_priv
);
348 /* get routing information */
349 orig_node
= batadv_orig_hash_find(bat_priv
, icmp_packet
->orig
);
353 /* create a copy of the skb, if needed, to modify it. */
354 if (skb_cow(skb
, ETH_HLEN
) < 0)
357 icmp_packet
= (struct batadv_icmp_packet
*)skb
->data
;
359 memcpy(icmp_packet
->dst
, icmp_packet
->orig
, ETH_ALEN
);
360 memcpy(icmp_packet
->orig
, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
361 icmp_packet
->msg_type
= BATADV_TTL_EXCEEDED
;
362 icmp_packet
->header
.ttl
= BATADV_TTL
;
364 if (batadv_send_skb_to_orig(skb
, orig_node
, NULL
))
365 ret
= NET_RX_SUCCESS
;
369 batadv_hardif_free_ref(primary_if
);
371 batadv_orig_node_free_ref(orig_node
);
376 int batadv_recv_icmp_packet(struct sk_buff
*skb
,
377 struct batadv_hard_iface
*recv_if
)
379 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
380 struct batadv_icmp_packet_rr
*icmp_packet
;
381 struct ethhdr
*ethhdr
;
382 struct batadv_orig_node
*orig_node
= NULL
;
383 int hdr_size
= sizeof(struct batadv_icmp_packet
);
384 int ret
= NET_RX_DROP
;
386 /* we truncate all incoming icmp packets if they don't match our size */
387 if (skb
->len
>= sizeof(struct batadv_icmp_packet_rr
))
388 hdr_size
= sizeof(struct batadv_icmp_packet_rr
);
390 /* drop packet if it has not necessary minimum size */
391 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
394 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
396 /* packet with unicast indication but broadcast recipient */
397 if (is_broadcast_ether_addr(ethhdr
->h_dest
))
400 /* packet with broadcast sender address */
401 if (is_broadcast_ether_addr(ethhdr
->h_source
))
405 if (!batadv_is_my_mac(bat_priv
, ethhdr
->h_dest
))
408 icmp_packet
= (struct batadv_icmp_packet_rr
*)skb
->data
;
410 /* add record route information if not full */
411 if ((hdr_size
== sizeof(struct batadv_icmp_packet_rr
)) &&
412 (icmp_packet
->rr_cur
< BATADV_RR_LEN
)) {
413 memcpy(&(icmp_packet
->rr
[icmp_packet
->rr_cur
]),
414 ethhdr
->h_dest
, ETH_ALEN
);
415 icmp_packet
->rr_cur
++;
419 if (batadv_is_my_mac(bat_priv
, icmp_packet
->dst
))
420 return batadv_recv_my_icmp_packet(bat_priv
, skb
, hdr_size
);
423 if (icmp_packet
->header
.ttl
< 2)
424 return batadv_recv_icmp_ttl_exceeded(bat_priv
, skb
);
426 /* get routing information */
427 orig_node
= batadv_orig_hash_find(bat_priv
, icmp_packet
->dst
);
431 /* create a copy of the skb, if needed, to modify it. */
432 if (skb_cow(skb
, ETH_HLEN
) < 0)
435 icmp_packet
= (struct batadv_icmp_packet_rr
*)skb
->data
;
438 icmp_packet
->header
.ttl
--;
441 if (batadv_send_skb_to_orig(skb
, orig_node
, recv_if
))
442 ret
= NET_RX_SUCCESS
;
446 batadv_orig_node_free_ref(orig_node
);
450 /* In the bonding case, send the packets in a round
451 * robin fashion over the remaining interfaces.
453 * This method rotates the bonding list and increases the
454 * returned router's refcount.
456 static struct batadv_neigh_node
*
457 batadv_find_bond_router(struct batadv_orig_node
*primary_orig
,
458 const struct batadv_hard_iface
*recv_if
)
460 struct batadv_neigh_node
*tmp_neigh_node
;
461 struct batadv_neigh_node
*router
= NULL
, *first_candidate
= NULL
;
464 list_for_each_entry_rcu(tmp_neigh_node
, &primary_orig
->bond_list
,
466 if (!first_candidate
)
467 first_candidate
= tmp_neigh_node
;
469 /* recv_if == NULL on the first node. */
470 if (tmp_neigh_node
->if_incoming
== recv_if
)
473 if (!atomic_inc_not_zero(&tmp_neigh_node
->refcount
))
476 router
= tmp_neigh_node
;
480 /* use the first candidate if nothing was found. */
481 if (!router
&& first_candidate
&&
482 atomic_inc_not_zero(&first_candidate
->refcount
))
483 router
= first_candidate
;
488 /* selected should point to the next element
489 * after the current router
491 spin_lock_bh(&primary_orig
->neigh_list_lock
);
492 /* this is a list_move(), which unfortunately
493 * does not exist as rcu version
495 list_del_rcu(&primary_orig
->bond_list
);
496 list_add_rcu(&primary_orig
->bond_list
,
497 &router
->bonding_list
);
498 spin_unlock_bh(&primary_orig
->neigh_list_lock
);
505 /* Interface Alternating: Use the best of the
506 * remaining candidates which are not using
509 * Increases the returned router's refcount
511 static struct batadv_neigh_node
*
512 batadv_find_ifalter_router(struct batadv_orig_node
*primary_orig
,
513 const struct batadv_hard_iface
*recv_if
)
515 struct batadv_neigh_node
*tmp_neigh_node
;
516 struct batadv_neigh_node
*router
= NULL
, *first_candidate
= NULL
;
519 list_for_each_entry_rcu(tmp_neigh_node
, &primary_orig
->bond_list
,
521 if (!first_candidate
)
522 first_candidate
= tmp_neigh_node
;
524 /* recv_if == NULL on the first node. */
525 if (tmp_neigh_node
->if_incoming
== recv_if
)
528 if (router
&& tmp_neigh_node
->tq_avg
<= router
->tq_avg
)
531 if (!atomic_inc_not_zero(&tmp_neigh_node
->refcount
))
534 /* decrement refcount of previously selected router */
536 batadv_neigh_node_free_ref(router
);
538 /* we found a better router (or at least one valid router) */
539 router
= tmp_neigh_node
;
542 /* use the first candidate if nothing was found. */
543 if (!router
&& first_candidate
&&
544 atomic_inc_not_zero(&first_candidate
->refcount
))
545 router
= first_candidate
;
551 static int batadv_check_unicast_packet(struct batadv_priv
*bat_priv
,
552 struct sk_buff
*skb
, int hdr_size
)
554 struct ethhdr
*ethhdr
;
556 /* drop packet if it has not necessary minimum size */
557 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
560 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
562 /* packet with unicast indication but broadcast recipient */
563 if (is_broadcast_ether_addr(ethhdr
->h_dest
))
566 /* packet with broadcast sender address */
567 if (is_broadcast_ether_addr(ethhdr
->h_source
))
571 if (!batadv_is_my_mac(bat_priv
, ethhdr
->h_dest
))
577 int batadv_recv_tt_query(struct sk_buff
*skb
, struct batadv_hard_iface
*recv_if
)
579 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
580 struct batadv_tt_query_packet
*tt_query
;
582 int hdr_size
= sizeof(*tt_query
);
586 if (batadv_check_unicast_packet(bat_priv
, skb
, hdr_size
) < 0)
589 /* I could need to modify it */
590 if (skb_cow(skb
, sizeof(struct batadv_tt_query_packet
)) < 0)
593 tt_query
= (struct batadv_tt_query_packet
*)skb
->data
;
595 switch (tt_query
->flags
& BATADV_TT_QUERY_TYPE_MASK
) {
596 case BATADV_TT_REQUEST
:
597 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_REQUEST_RX
);
599 /* If we cannot provide an answer the tt_request is
602 if (!batadv_send_tt_response(bat_priv
, tt_query
)) {
603 if (tt_query
->flags
& BATADV_TT_FULL_TABLE
)
608 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
609 "Routing TT_REQUEST to %pM [%c]\n",
612 return batadv_route_unicast_packet(skb
, recv_if
);
615 case BATADV_TT_RESPONSE
:
616 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_RX
);
618 if (batadv_is_my_mac(bat_priv
, tt_query
->dst
)) {
619 /* packet needs to be linearized to access the TT
622 if (skb_linearize(skb
) < 0)
624 /* skb_linearize() possibly changed skb->data */
625 tt_query
= (struct batadv_tt_query_packet
*)skb
->data
;
627 tt_size
= batadv_tt_len(ntohs(tt_query
->tt_data
));
629 /* Ensure we have all the claimed data */
630 packet_size
= sizeof(struct batadv_tt_query_packet
);
631 packet_size
+= tt_size
;
632 if (unlikely(skb_headlen(skb
) < packet_size
))
635 batadv_handle_tt_response(bat_priv
, tt_query
);
637 if (tt_query
->flags
& BATADV_TT_FULL_TABLE
)
641 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
642 "Routing TT_RESPONSE to %pM [%c]\n",
645 return batadv_route_unicast_packet(skb
, recv_if
);
651 /* returning NET_RX_DROP will make the caller function kfree the skb */
655 int batadv_recv_roam_adv(struct sk_buff
*skb
, struct batadv_hard_iface
*recv_if
)
657 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
658 struct batadv_roam_adv_packet
*roam_adv_packet
;
659 struct batadv_orig_node
*orig_node
;
661 if (batadv_check_unicast_packet(bat_priv
, skb
,
662 sizeof(*roam_adv_packet
)) < 0)
665 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_ROAM_ADV_RX
);
667 roam_adv_packet
= (struct batadv_roam_adv_packet
*)skb
->data
;
669 if (!batadv_is_my_mac(bat_priv
, roam_adv_packet
->dst
))
670 return batadv_route_unicast_packet(skb
, recv_if
);
672 /* check if it is a backbone gateway. we don't accept
673 * roaming advertisement from it, as it has the same
674 * entries as we have.
676 if (batadv_bla_is_backbone_gw_orig(bat_priv
, roam_adv_packet
->src
))
679 orig_node
= batadv_orig_hash_find(bat_priv
, roam_adv_packet
->src
);
683 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
684 "Received ROAMING_ADV from %pM (client %pM)\n",
685 roam_adv_packet
->src
, roam_adv_packet
->client
);
687 batadv_tt_global_add(bat_priv
, orig_node
, roam_adv_packet
->client
,
688 BATADV_TT_CLIENT_ROAM
,
689 atomic_read(&orig_node
->last_ttvn
) + 1);
691 batadv_orig_node_free_ref(orig_node
);
693 /* returning NET_RX_DROP will make the caller function kfree the skb */
697 /* find a suitable router for this originator, and use
698 * bonding if possible. increases the found neighbors
701 struct batadv_neigh_node
*
702 batadv_find_router(struct batadv_priv
*bat_priv
,
703 struct batadv_orig_node
*orig_node
,
704 const struct batadv_hard_iface
*recv_if
)
706 struct batadv_orig_node
*primary_orig_node
;
707 struct batadv_orig_node
*router_orig
;
708 struct batadv_neigh_node
*router
;
709 static uint8_t zero_mac
[ETH_ALEN
] = {0, 0, 0, 0, 0, 0};
711 uint8_t *primary_addr
;
716 router
= batadv_orig_node_get_router(orig_node
);
720 /* without bonding, the first node should
721 * always choose the default router.
723 bonding_enabled
= atomic_read(&bat_priv
->bonding
);
726 /* select default router to output */
727 router_orig
= router
->orig_node
;
731 if ((!recv_if
) && (!bonding_enabled
))
734 primary_addr
= router_orig
->primary_addr
;
736 /* if we have something in the primary_addr, we can search
737 * for a potential bonding candidate.
739 if (batadv_compare_eth(primary_addr
, zero_mac
))
742 /* find the orig_node which has the primary interface. might
743 * even be the same as our router_orig in many cases
745 if (batadv_compare_eth(primary_addr
, router_orig
->orig
)) {
746 primary_orig_node
= router_orig
;
748 primary_orig_node
= batadv_orig_hash_find(bat_priv
,
750 if (!primary_orig_node
)
753 batadv_orig_node_free_ref(primary_orig_node
);
756 /* with less than 2 candidates, we can't do any
757 * bonding and prefer the original router.
759 if (atomic_read(&primary_orig_node
->bond_candidates
) < 2)
762 /* all nodes between should choose a candidate which
763 * is is not on the interface where the packet came
766 batadv_neigh_node_free_ref(router
);
769 router
= batadv_find_bond_router(primary_orig_node
, recv_if
);
771 router
= batadv_find_ifalter_router(primary_orig_node
, recv_if
);
774 if (router
&& router
->if_incoming
->if_status
!= BATADV_IF_ACTIVE
)
783 batadv_neigh_node_free_ref(router
);
787 static int batadv_route_unicast_packet(struct sk_buff
*skb
,
788 struct batadv_hard_iface
*recv_if
)
790 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
791 struct batadv_orig_node
*orig_node
= NULL
;
792 struct batadv_neigh_node
*neigh_node
= NULL
;
793 struct batadv_unicast_packet
*unicast_packet
;
794 struct ethhdr
*ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
795 int ret
= NET_RX_DROP
;
796 struct sk_buff
*new_skb
;
798 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
801 if (unicast_packet
->header
.ttl
< 2) {
802 pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n",
803 ethhdr
->h_source
, unicast_packet
->dest
);
807 /* get routing information */
808 orig_node
= batadv_orig_hash_find(bat_priv
, unicast_packet
->dest
);
813 /* find_router() increases neigh_nodes refcount if found. */
814 neigh_node
= batadv_find_router(bat_priv
, orig_node
, recv_if
);
819 /* create a copy of the skb, if needed, to modify it. */
820 if (skb_cow(skb
, ETH_HLEN
) < 0)
823 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
825 if (unicast_packet
->header
.packet_type
== BATADV_UNICAST
&&
826 atomic_read(&bat_priv
->fragmentation
) &&
827 skb
->len
> neigh_node
->if_incoming
->net_dev
->mtu
) {
828 ret
= batadv_frag_send_skb(skb
, bat_priv
,
829 neigh_node
->if_incoming
,
834 if (unicast_packet
->header
.packet_type
== BATADV_UNICAST_FRAG
&&
835 batadv_frag_can_reassemble(skb
,
836 neigh_node
->if_incoming
->net_dev
->mtu
)) {
837 ret
= batadv_frag_reassemble_skb(skb
, bat_priv
, &new_skb
);
839 if (ret
== NET_RX_DROP
)
842 /* packet was buffered for late merge */
844 ret
= NET_RX_SUCCESS
;
849 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
853 unicast_packet
->header
.ttl
--;
855 /* Update stats counter */
856 batadv_inc_counter(bat_priv
, BATADV_CNT_FORWARD
);
857 batadv_add_counter(bat_priv
, BATADV_CNT_FORWARD_BYTES
,
858 skb
->len
+ ETH_HLEN
);
861 if (batadv_send_skb_to_orig(skb
, orig_node
, recv_if
))
862 ret
= NET_RX_SUCCESS
;
866 batadv_neigh_node_free_ref(neigh_node
);
868 batadv_orig_node_free_ref(orig_node
);
873 * batadv_reroute_unicast_packet - update the unicast header for re-routing
874 * @bat_priv: the bat priv with all the soft interface information
875 * @unicast_packet: the unicast header to be updated
876 * @dst_addr: the payload destination
878 * Search the translation table for dst_addr and update the unicast header with
879 * the new corresponding information (originator address where the destination
880 * client currently is and its known TTVN)
882 * Returns true if the packet header has been updated, false otherwise
885 batadv_reroute_unicast_packet(struct batadv_priv
*bat_priv
,
886 struct batadv_unicast_packet
*unicast_packet
,
889 struct batadv_orig_node
*orig_node
= NULL
;
890 struct batadv_hard_iface
*primary_if
= NULL
;
892 uint8_t *orig_addr
, orig_ttvn
;
894 if (batadv_is_my_client(bat_priv
, dst_addr
)) {
895 primary_if
= batadv_primary_if_get_selected(bat_priv
);
898 orig_addr
= primary_if
->net_dev
->dev_addr
;
899 orig_ttvn
= (uint8_t)atomic_read(&bat_priv
->tt
.vn
);
901 orig_node
= batadv_transtable_search(bat_priv
, NULL
, dst_addr
);
905 if (batadv_compare_eth(orig_node
->orig
, unicast_packet
->dest
))
908 orig_addr
= orig_node
->orig
;
909 orig_ttvn
= (uint8_t)atomic_read(&orig_node
->last_ttvn
);
912 /* update the packet header */
913 memcpy(unicast_packet
->dest
, orig_addr
, ETH_ALEN
);
914 unicast_packet
->ttvn
= orig_ttvn
;
919 batadv_hardif_free_ref(primary_if
);
921 batadv_orig_node_free_ref(orig_node
);
926 static int batadv_check_unicast_ttvn(struct batadv_priv
*bat_priv
,
927 struct sk_buff
*skb
) {
928 uint8_t curr_ttvn
, old_ttvn
;
929 struct batadv_orig_node
*orig_node
;
930 struct ethhdr
*ethhdr
;
931 struct batadv_hard_iface
*primary_if
;
932 struct batadv_unicast_packet
*unicast_packet
;
935 /* check if there is enough data before accessing it */
936 if (pskb_may_pull(skb
, sizeof(*unicast_packet
) + ETH_HLEN
) < 0)
939 /* create a copy of the skb (in case of for re-routing) to modify it. */
940 if (skb_cow(skb
, sizeof(*unicast_packet
)) < 0)
943 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
944 ethhdr
= (struct ethhdr
*)(skb
->data
+ sizeof(*unicast_packet
));
946 /* check if the destination client was served by this node and it is now
947 * roaming. In this case, it means that the node has got a ROAM_ADV
948 * message and that it knows the new destination in the mesh to re-route
951 if (batadv_tt_local_client_is_roaming(bat_priv
, ethhdr
->h_dest
)) {
952 if (batadv_reroute_unicast_packet(bat_priv
, unicast_packet
,
954 net_ratelimited_function(batadv_dbg
, BATADV_DBG_TT
,
956 "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n",
957 unicast_packet
->dest
,
959 /* at this point the mesh destination should have been
960 * substituted with the originator address found in the global
961 * table. If not, let the packet go untouched anyway because
962 * there is nothing the node can do
967 /* retrieve the TTVN known by this node for the packet destination. This
968 * value is used later to check if the node which sent (or re-routed
969 * last time) the packet had an updated information or not
971 curr_ttvn
= (uint8_t)atomic_read(&bat_priv
->tt
.vn
);
972 if (!batadv_is_my_mac(bat_priv
, unicast_packet
->dest
)) {
973 orig_node
= batadv_orig_hash_find(bat_priv
,
974 unicast_packet
->dest
);
975 /* if it is not possible to find the orig_node representing the
976 * destination, the packet can immediately be dropped as it will
977 * not be possible to deliver it
982 curr_ttvn
= (uint8_t)atomic_read(&orig_node
->last_ttvn
);
983 batadv_orig_node_free_ref(orig_node
);
986 /* check if the TTVN contained in the packet is fresher than what the
989 is_old_ttvn
= batadv_seq_before(unicast_packet
->ttvn
, curr_ttvn
);
993 old_ttvn
= unicast_packet
->ttvn
;
994 /* the packet was forged based on outdated network information. Its
995 * destination can possibly be updated and forwarded towards the new
998 if (batadv_reroute_unicast_packet(bat_priv
, unicast_packet
,
1000 net_ratelimited_function(batadv_dbg
, BATADV_DBG_TT
, bat_priv
,
1001 "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n",
1002 unicast_packet
->dest
, ethhdr
->h_dest
,
1003 old_ttvn
, curr_ttvn
);
1007 /* the packet has not been re-routed: either the destination is
1008 * currently served by this node or there is no destination at all and
1009 * it is possible to drop the packet
1011 if (!batadv_is_my_client(bat_priv
, ethhdr
->h_dest
))
1014 /* update the header in order to let the packet be delivered to this
1015 * node's soft interface
1017 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1021 memcpy(unicast_packet
->dest
, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
1023 batadv_hardif_free_ref(primary_if
);
1025 unicast_packet
->ttvn
= curr_ttvn
;
1030 int batadv_recv_unicast_packet(struct sk_buff
*skb
,
1031 struct batadv_hard_iface
*recv_if
)
1033 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1034 struct batadv_unicast_packet
*unicast_packet
;
1035 struct batadv_unicast_4addr_packet
*unicast_4addr_packet
;
1037 struct batadv_orig_node
*orig_node
= NULL
;
1038 int hdr_size
= sizeof(*unicast_packet
);
1041 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
1042 unicast_4addr_packet
= (struct batadv_unicast_4addr_packet
*)skb
->data
;
1044 is4addr
= unicast_packet
->header
.packet_type
== BATADV_UNICAST_4ADDR
;
1045 /* the caller function should have already pulled 2 bytes */
1047 hdr_size
= sizeof(*unicast_4addr_packet
);
1049 if (batadv_check_unicast_packet(bat_priv
, skb
, hdr_size
) < 0)
1052 if (!batadv_check_unicast_ttvn(bat_priv
, skb
))
1056 if (batadv_is_my_mac(bat_priv
, unicast_packet
->dest
)) {
1058 batadv_dat_inc_counter(bat_priv
,
1059 unicast_4addr_packet
->subtype
);
1060 orig_addr
= unicast_4addr_packet
->src
;
1061 orig_node
= batadv_orig_hash_find(bat_priv
, orig_addr
);
1064 if (batadv_dat_snoop_incoming_arp_request(bat_priv
, skb
,
1067 if (batadv_dat_snoop_incoming_arp_reply(bat_priv
, skb
,
1071 batadv_interface_rx(recv_if
->soft_iface
, skb
, recv_if
, hdr_size
,
1076 batadv_orig_node_free_ref(orig_node
);
1078 return NET_RX_SUCCESS
;
1081 return batadv_route_unicast_packet(skb
, recv_if
);
1084 int batadv_recv_ucast_frag_packet(struct sk_buff
*skb
,
1085 struct batadv_hard_iface
*recv_if
)
1087 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1088 struct batadv_unicast_frag_packet
*unicast_packet
;
1089 int hdr_size
= sizeof(*unicast_packet
);
1090 struct sk_buff
*new_skb
= NULL
;
1093 if (batadv_check_unicast_packet(bat_priv
, skb
, hdr_size
) < 0)
1096 if (!batadv_check_unicast_ttvn(bat_priv
, skb
))
1099 unicast_packet
= (struct batadv_unicast_frag_packet
*)skb
->data
;
1102 if (batadv_is_my_mac(bat_priv
, unicast_packet
->dest
)) {
1103 ret
= batadv_frag_reassemble_skb(skb
, bat_priv
, &new_skb
);
1105 if (ret
== NET_RX_DROP
)
1108 /* packet was buffered for late merge */
1110 return NET_RX_SUCCESS
;
1112 if (batadv_dat_snoop_incoming_arp_request(bat_priv
, new_skb
,
1115 if (batadv_dat_snoop_incoming_arp_reply(bat_priv
, new_skb
,
1119 batadv_interface_rx(recv_if
->soft_iface
, new_skb
, recv_if
,
1120 sizeof(struct batadv_unicast_packet
), NULL
);
1123 return NET_RX_SUCCESS
;
1126 return batadv_route_unicast_packet(skb
, recv_if
);
1130 int batadv_recv_bcast_packet(struct sk_buff
*skb
,
1131 struct batadv_hard_iface
*recv_if
)
1133 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1134 struct batadv_orig_node
*orig_node
= NULL
;
1135 struct batadv_bcast_packet
*bcast_packet
;
1136 struct ethhdr
*ethhdr
;
1137 int hdr_size
= sizeof(*bcast_packet
);
1138 int ret
= NET_RX_DROP
;
1141 /* drop packet if it has not necessary minimum size */
1142 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
1145 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
1147 /* packet with broadcast indication but unicast recipient */
1148 if (!is_broadcast_ether_addr(ethhdr
->h_dest
))
1151 /* packet with broadcast sender address */
1152 if (is_broadcast_ether_addr(ethhdr
->h_source
))
1155 /* ignore broadcasts sent by myself */
1156 if (batadv_is_my_mac(bat_priv
, ethhdr
->h_source
))
1159 bcast_packet
= (struct batadv_bcast_packet
*)skb
->data
;
1161 /* ignore broadcasts originated by myself */
1162 if (batadv_is_my_mac(bat_priv
, bcast_packet
->orig
))
1165 if (bcast_packet
->header
.ttl
< 2)
1168 orig_node
= batadv_orig_hash_find(bat_priv
, bcast_packet
->orig
);
1173 spin_lock_bh(&orig_node
->bcast_seqno_lock
);
1175 /* check whether the packet is a duplicate */
1176 if (batadv_test_bit(orig_node
->bcast_bits
, orig_node
->last_bcast_seqno
,
1177 ntohl(bcast_packet
->seqno
)))
1180 seq_diff
= ntohl(bcast_packet
->seqno
) - orig_node
->last_bcast_seqno
;
1182 /* check whether the packet is old and the host just restarted. */
1183 if (batadv_window_protected(bat_priv
, seq_diff
,
1184 &orig_node
->bcast_seqno_reset
))
1187 /* mark broadcast in flood history, update window position
1190 if (batadv_bit_get_packet(bat_priv
, orig_node
->bcast_bits
, seq_diff
, 1))
1191 orig_node
->last_bcast_seqno
= ntohl(bcast_packet
->seqno
);
1193 spin_unlock_bh(&orig_node
->bcast_seqno_lock
);
1195 /* check whether this has been sent by another originator before */
1196 if (batadv_bla_check_bcast_duplist(bat_priv
, skb
))
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
);
1229 int batadv_recv_vis_packet(struct sk_buff
*skb
,
1230 struct batadv_hard_iface
*recv_if
)
1232 struct batadv_vis_packet
*vis_packet
;
1233 struct ethhdr
*ethhdr
;
1234 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1235 int hdr_size
= sizeof(*vis_packet
);
1237 /* keep skb linear */
1238 if (skb_linearize(skb
) < 0)
1241 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
1244 vis_packet
= (struct batadv_vis_packet
*)skb
->data
;
1245 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
1248 if (!batadv_is_my_mac(bat_priv
, ethhdr
->h_dest
))
1251 /* ignore own packets */
1252 if (batadv_is_my_mac(bat_priv
, vis_packet
->vis_orig
))
1255 if (batadv_is_my_mac(bat_priv
, vis_packet
->sender_orig
))
1258 switch (vis_packet
->vis_type
) {
1259 case BATADV_VIS_TYPE_SERVER_SYNC
:
1260 batadv_receive_server_sync_packet(bat_priv
, vis_packet
,
1264 case BATADV_VIS_TYPE_CLIENT_UPDATE
:
1265 batadv_receive_client_update_packet(bat_priv
, vis_packet
,
1269 default: /* ignore unknown packet */
1273 /* We take a copy of the data in the packet, so we should
1274 * always free the skbuf.