1 /* Copyright (C) 2007-2012 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"
32 static int batadv_route_unicast_packet(struct sk_buff
*skb
,
33 struct batadv_hard_iface
*recv_if
);
35 void batadv_slide_own_bcast_window(struct batadv_hard_iface
*hard_iface
)
37 struct batadv_priv
*bat_priv
= netdev_priv(hard_iface
->soft_iface
);
38 struct batadv_hashtable
*hash
= bat_priv
->orig_hash
;
39 struct hlist_node
*node
;
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
, 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
)) {
83 batadv_dbg(BATADV_DBG_ROUTES
, bat_priv
,
84 "Adding route towards: %pM (via %pM)\n",
85 orig_node
->orig
, neigh_node
->addr
);
87 } else if (neigh_node
&& curr_router
) {
88 batadv_dbg(BATADV_DBG_ROUTES
, bat_priv
,
89 "Changing route towards: %pM (now via %pM - was via %pM)\n",
90 orig_node
->orig
, neigh_node
->addr
,
95 batadv_neigh_node_free_ref(curr_router
);
97 /* increase refcount of new best neighbor */
98 if (neigh_node
&& !atomic_inc_not_zero(&neigh_node
->refcount
))
101 spin_lock_bh(&orig_node
->neigh_list_lock
);
102 rcu_assign_pointer(orig_node
->router
, neigh_node
);
103 spin_unlock_bh(&orig_node
->neigh_list_lock
);
105 /* decrease refcount of previous best neighbor */
107 batadv_neigh_node_free_ref(curr_router
);
110 void batadv_update_route(struct batadv_priv
*bat_priv
,
111 struct batadv_orig_node
*orig_node
,
112 struct batadv_neigh_node
*neigh_node
)
114 struct batadv_neigh_node
*router
= NULL
;
119 router
= batadv_orig_node_get_router(orig_node
);
121 if (router
!= neigh_node
)
122 _batadv_update_route(bat_priv
, orig_node
, neigh_node
);
126 batadv_neigh_node_free_ref(router
);
129 /* caller must hold the neigh_list_lock */
130 void batadv_bonding_candidate_del(struct batadv_orig_node
*orig_node
,
131 struct batadv_neigh_node
*neigh_node
)
133 /* this neighbor is not part of our candidate list */
134 if (list_empty(&neigh_node
->bonding_list
))
137 list_del_rcu(&neigh_node
->bonding_list
);
138 INIT_LIST_HEAD(&neigh_node
->bonding_list
);
139 batadv_neigh_node_free_ref(neigh_node
);
140 atomic_dec(&orig_node
->bond_candidates
);
146 void batadv_bonding_candidate_add(struct batadv_orig_node
*orig_node
,
147 struct batadv_neigh_node
*neigh_node
)
149 struct hlist_node
*node
;
150 struct batadv_neigh_node
*tmp_neigh_node
, *router
= NULL
;
151 uint8_t interference_candidate
= 0;
153 spin_lock_bh(&orig_node
->neigh_list_lock
);
155 /* only consider if it has the same primary address ... */
156 if (!batadv_compare_eth(orig_node
->orig
,
157 neigh_node
->orig_node
->primary_addr
))
160 router
= batadv_orig_node_get_router(orig_node
);
164 /* ... and is good enough to be considered */
165 if (neigh_node
->tq_avg
< router
->tq_avg
- BATADV_BONDING_TQ_THRESHOLD
)
168 /* check if we have another candidate with the same mac address or
169 * interface. If we do, we won't select this candidate because of
170 * possible interference.
172 hlist_for_each_entry_rcu(tmp_neigh_node
, node
,
173 &orig_node
->neigh_list
, list
) {
175 if (tmp_neigh_node
== neigh_node
)
178 /* we only care if the other candidate is even
179 * considered as candidate.
181 if (list_empty(&tmp_neigh_node
->bonding_list
))
184 if ((neigh_node
->if_incoming
== tmp_neigh_node
->if_incoming
) ||
185 (batadv_compare_eth(neigh_node
->addr
,
186 tmp_neigh_node
->addr
))) {
187 interference_candidate
= 1;
192 /* don't care further if it is an interference candidate */
193 if (interference_candidate
)
196 /* this neighbor already is part of our candidate list */
197 if (!list_empty(&neigh_node
->bonding_list
))
200 if (!atomic_inc_not_zero(&neigh_node
->refcount
))
203 list_add_rcu(&neigh_node
->bonding_list
, &orig_node
->bond_list
);
204 atomic_inc(&orig_node
->bond_candidates
);
208 batadv_bonding_candidate_del(orig_node
, neigh_node
);
211 spin_unlock_bh(&orig_node
->neigh_list_lock
);
214 batadv_neigh_node_free_ref(router
);
217 /* copy primary address for bonding */
219 batadv_bonding_save_primary(const struct batadv_orig_node
*orig_node
,
220 struct batadv_orig_node
*orig_neigh_node
,
221 const struct batadv_ogm_packet
*batman_ogm_packet
)
223 if (!(batman_ogm_packet
->flags
& BATADV_PRIMARIES_FIRST_HOP
))
226 memcpy(orig_neigh_node
->primary_addr
, orig_node
->orig
, ETH_ALEN
);
229 /* checks whether the host restarted and is in the protection time.
231 * 0 if the packet is to be accepted
232 * 1 if the packet is to be ignored.
234 int batadv_window_protected(struct batadv_priv
*bat_priv
, int32_t seq_num_diff
,
235 unsigned long *last_reset
)
237 if (seq_num_diff
<= -BATADV_TQ_LOCAL_WINDOW_SIZE
||
238 seq_num_diff
>= BATADV_EXPECTED_SEQNO_RANGE
) {
239 if (!batadv_has_timed_out(*last_reset
,
240 BATADV_RESET_PROTECTION_MS
))
243 *last_reset
= jiffies
;
244 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
245 "old packet received, start protection\n");
251 bool batadv_check_management_packet(struct sk_buff
*skb
,
252 struct batadv_hard_iface
*hard_iface
,
255 struct ethhdr
*ethhdr
;
257 /* drop packet if it has not necessary minimum size */
258 if (unlikely(!pskb_may_pull(skb
, header_len
)))
261 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
263 /* packet with broadcast indication but unicast recipient */
264 if (!is_broadcast_ether_addr(ethhdr
->h_dest
))
267 /* packet with broadcast sender address */
268 if (is_broadcast_ether_addr(ethhdr
->h_source
))
271 /* create a copy of the skb, if needed, to modify it. */
272 if (skb_cow(skb
, 0) < 0)
275 /* keep skb linear */
276 if (skb_linearize(skb
) < 0)
282 static int batadv_recv_my_icmp_packet(struct batadv_priv
*bat_priv
,
283 struct sk_buff
*skb
, size_t icmp_len
)
285 struct batadv_hard_iface
*primary_if
= NULL
;
286 struct batadv_orig_node
*orig_node
= NULL
;
287 struct batadv_neigh_node
*router
= NULL
;
288 struct batadv_icmp_packet_rr
*icmp_packet
;
289 int ret
= NET_RX_DROP
;
291 icmp_packet
= (struct batadv_icmp_packet_rr
*)skb
->data
;
293 /* add data to device queue */
294 if (icmp_packet
->msg_type
!= BATADV_ECHO_REQUEST
) {
295 batadv_socket_receive_packet(icmp_packet
, icmp_len
);
299 primary_if
= batadv_primary_if_get_selected(bat_priv
);
303 /* answer echo request (ping) */
304 /* get routing information */
305 orig_node
= batadv_orig_hash_find(bat_priv
, icmp_packet
->orig
);
309 router
= batadv_orig_node_get_router(orig_node
);
313 /* create a copy of the skb, if needed, to modify it. */
314 if (skb_cow(skb
, ETH_HLEN
) < 0)
317 icmp_packet
= (struct batadv_icmp_packet_rr
*)skb
->data
;
319 memcpy(icmp_packet
->dst
, icmp_packet
->orig
, ETH_ALEN
);
320 memcpy(icmp_packet
->orig
, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
321 icmp_packet
->msg_type
= BATADV_ECHO_REPLY
;
322 icmp_packet
->header
.ttl
= BATADV_TTL
;
324 batadv_send_skb_packet(skb
, router
->if_incoming
, router
->addr
);
325 ret
= NET_RX_SUCCESS
;
329 batadv_hardif_free_ref(primary_if
);
331 batadv_neigh_node_free_ref(router
);
333 batadv_orig_node_free_ref(orig_node
);
337 static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv
*bat_priv
,
340 struct batadv_hard_iface
*primary_if
= NULL
;
341 struct batadv_orig_node
*orig_node
= NULL
;
342 struct batadv_neigh_node
*router
= NULL
;
343 struct batadv_icmp_packet
*icmp_packet
;
344 int ret
= NET_RX_DROP
;
346 icmp_packet
= (struct batadv_icmp_packet
*)skb
->data
;
348 /* send TTL exceeded if packet is an echo request (traceroute) */
349 if (icmp_packet
->msg_type
!= BATADV_ECHO_REQUEST
) {
350 pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n",
351 icmp_packet
->orig
, icmp_packet
->dst
);
355 primary_if
= batadv_primary_if_get_selected(bat_priv
);
359 /* get routing information */
360 orig_node
= batadv_orig_hash_find(bat_priv
, icmp_packet
->orig
);
364 router
= batadv_orig_node_get_router(orig_node
);
368 /* create a copy of the skb, if needed, to modify it. */
369 if (skb_cow(skb
, ETH_HLEN
) < 0)
372 icmp_packet
= (struct batadv_icmp_packet
*)skb
->data
;
374 memcpy(icmp_packet
->dst
, icmp_packet
->orig
, ETH_ALEN
);
375 memcpy(icmp_packet
->orig
, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
376 icmp_packet
->msg_type
= BATADV_TTL_EXCEEDED
;
377 icmp_packet
->header
.ttl
= BATADV_TTL
;
379 batadv_send_skb_packet(skb
, router
->if_incoming
, router
->addr
);
380 ret
= NET_RX_SUCCESS
;
384 batadv_hardif_free_ref(primary_if
);
386 batadv_neigh_node_free_ref(router
);
388 batadv_orig_node_free_ref(orig_node
);
393 int batadv_recv_icmp_packet(struct sk_buff
*skb
,
394 struct batadv_hard_iface
*recv_if
)
396 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
397 struct batadv_icmp_packet_rr
*icmp_packet
;
398 struct ethhdr
*ethhdr
;
399 struct batadv_orig_node
*orig_node
= NULL
;
400 struct batadv_neigh_node
*router
= NULL
;
401 int hdr_size
= sizeof(struct batadv_icmp_packet
);
402 int ret
= NET_RX_DROP
;
404 /* we truncate all incoming icmp packets if they don't match our size */
405 if (skb
->len
>= sizeof(struct batadv_icmp_packet_rr
))
406 hdr_size
= sizeof(struct batadv_icmp_packet_rr
);
408 /* drop packet if it has not necessary minimum size */
409 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
412 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
414 /* packet with unicast indication but broadcast recipient */
415 if (is_broadcast_ether_addr(ethhdr
->h_dest
))
418 /* packet with broadcast sender address */
419 if (is_broadcast_ether_addr(ethhdr
->h_source
))
423 if (!batadv_is_my_mac(ethhdr
->h_dest
))
426 icmp_packet
= (struct batadv_icmp_packet_rr
*)skb
->data
;
428 /* add record route information if not full */
429 if ((hdr_size
== sizeof(struct batadv_icmp_packet_rr
)) &&
430 (icmp_packet
->rr_cur
< BATADV_RR_LEN
)) {
431 memcpy(&(icmp_packet
->rr
[icmp_packet
->rr_cur
]),
432 ethhdr
->h_dest
, ETH_ALEN
);
433 icmp_packet
->rr_cur
++;
437 if (batadv_is_my_mac(icmp_packet
->dst
))
438 return batadv_recv_my_icmp_packet(bat_priv
, skb
, hdr_size
);
441 if (icmp_packet
->header
.ttl
< 2)
442 return batadv_recv_icmp_ttl_exceeded(bat_priv
, skb
);
444 /* get routing information */
445 orig_node
= batadv_orig_hash_find(bat_priv
, icmp_packet
->dst
);
449 router
= batadv_orig_node_get_router(orig_node
);
453 /* create a copy of the skb, if needed, to modify it. */
454 if (skb_cow(skb
, ETH_HLEN
) < 0)
457 icmp_packet
= (struct batadv_icmp_packet_rr
*)skb
->data
;
460 icmp_packet
->header
.ttl
--;
463 batadv_send_skb_packet(skb
, router
->if_incoming
, router
->addr
);
464 ret
= NET_RX_SUCCESS
;
468 batadv_neigh_node_free_ref(router
);
470 batadv_orig_node_free_ref(orig_node
);
474 /* In the bonding case, send the packets in a round
475 * robin fashion over the remaining interfaces.
477 * This method rotates the bonding list and increases the
478 * returned router's refcount.
480 static struct batadv_neigh_node
*
481 batadv_find_bond_router(struct batadv_orig_node
*primary_orig
,
482 const struct batadv_hard_iface
*recv_if
)
484 struct batadv_neigh_node
*tmp_neigh_node
;
485 struct batadv_neigh_node
*router
= NULL
, *first_candidate
= NULL
;
488 list_for_each_entry_rcu(tmp_neigh_node
, &primary_orig
->bond_list
,
490 if (!first_candidate
)
491 first_candidate
= tmp_neigh_node
;
493 /* recv_if == NULL on the first node. */
494 if (tmp_neigh_node
->if_incoming
== recv_if
)
497 if (!atomic_inc_not_zero(&tmp_neigh_node
->refcount
))
500 router
= tmp_neigh_node
;
504 /* use the first candidate if nothing was found. */
505 if (!router
&& first_candidate
&&
506 atomic_inc_not_zero(&first_candidate
->refcount
))
507 router
= first_candidate
;
512 /* selected should point to the next element
513 * after the current router
515 spin_lock_bh(&primary_orig
->neigh_list_lock
);
516 /* this is a list_move(), which unfortunately
517 * does not exist as rcu version
519 list_del_rcu(&primary_orig
->bond_list
);
520 list_add_rcu(&primary_orig
->bond_list
,
521 &router
->bonding_list
);
522 spin_unlock_bh(&primary_orig
->neigh_list_lock
);
529 /* Interface Alternating: Use the best of the
530 * remaining candidates which are not using
533 * Increases the returned router's refcount
535 static struct batadv_neigh_node
*
536 batadv_find_ifalter_router(struct batadv_orig_node
*primary_orig
,
537 const struct batadv_hard_iface
*recv_if
)
539 struct batadv_neigh_node
*tmp_neigh_node
;
540 struct batadv_neigh_node
*router
= NULL
, *first_candidate
= NULL
;
543 list_for_each_entry_rcu(tmp_neigh_node
, &primary_orig
->bond_list
,
545 if (!first_candidate
)
546 first_candidate
= tmp_neigh_node
;
548 /* recv_if == NULL on the first node. */
549 if (tmp_neigh_node
->if_incoming
== recv_if
)
552 if (!atomic_inc_not_zero(&tmp_neigh_node
->refcount
))
555 /* if we don't have a router yet
556 * or this one is better, choose it.
559 (tmp_neigh_node
->tq_avg
> router
->tq_avg
)) {
560 /* decrement refcount of
561 * previously selected router
564 batadv_neigh_node_free_ref(router
);
566 router
= tmp_neigh_node
;
567 atomic_inc_not_zero(&router
->refcount
);
570 batadv_neigh_node_free_ref(tmp_neigh_node
);
573 /* use the first candidate if nothing was found. */
574 if (!router
&& first_candidate
&&
575 atomic_inc_not_zero(&first_candidate
->refcount
))
576 router
= first_candidate
;
582 int batadv_recv_tt_query(struct sk_buff
*skb
, struct batadv_hard_iface
*recv_if
)
584 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
585 struct batadv_tt_query_packet
*tt_query
;
587 struct ethhdr
*ethhdr
;
591 /* drop packet if it has not necessary minimum size */
592 if (unlikely(!pskb_may_pull(skb
,
593 sizeof(struct batadv_tt_query_packet
))))
596 /* I could need to modify it */
597 if (skb_cow(skb
, sizeof(struct batadv_tt_query_packet
)) < 0)
600 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
602 /* packet with unicast indication but broadcast recipient */
603 if (is_broadcast_ether_addr(ethhdr
->h_dest
))
606 /* packet with broadcast sender address */
607 if (is_broadcast_ether_addr(ethhdr
->h_source
))
610 tt_query
= (struct batadv_tt_query_packet
*)skb
->data
;
612 switch (tt_query
->flags
& BATADV_TT_QUERY_TYPE_MASK
) {
613 case BATADV_TT_REQUEST
:
614 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_REQUEST_RX
);
616 /* If we cannot provide an answer the tt_request is
619 if (!batadv_send_tt_response(bat_priv
, tt_query
)) {
620 if (tt_query
->flags
& BATADV_TT_FULL_TABLE
)
625 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
626 "Routing TT_REQUEST to %pM [%c]\n",
629 return batadv_route_unicast_packet(skb
, recv_if
);
632 case BATADV_TT_RESPONSE
:
633 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_RX
);
635 if (batadv_is_my_mac(tt_query
->dst
)) {
636 /* packet needs to be linearized to access the TT
639 if (skb_linearize(skb
) < 0)
641 /* skb_linearize() possibly changed skb->data */
642 tt_query
= (struct batadv_tt_query_packet
*)skb
->data
;
644 tt_size
= batadv_tt_len(ntohs(tt_query
->tt_data
));
646 /* Ensure we have all the claimed data */
647 packet_size
= sizeof(struct batadv_tt_query_packet
);
648 packet_size
+= tt_size
;
649 if (unlikely(skb_headlen(skb
) < packet_size
))
652 batadv_handle_tt_response(bat_priv
, tt_query
);
654 if (tt_query
->flags
& BATADV_TT_FULL_TABLE
)
658 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
659 "Routing TT_RESPONSE to %pM [%c]\n",
662 return batadv_route_unicast_packet(skb
, recv_if
);
668 /* returning NET_RX_DROP will make the caller function kfree the skb */
672 int batadv_recv_roam_adv(struct sk_buff
*skb
, struct batadv_hard_iface
*recv_if
)
674 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
675 struct batadv_roam_adv_packet
*roam_adv_packet
;
676 struct batadv_orig_node
*orig_node
;
677 struct ethhdr
*ethhdr
;
679 /* drop packet if it has not necessary minimum size */
680 if (unlikely(!pskb_may_pull(skb
,
681 sizeof(struct batadv_roam_adv_packet
))))
684 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
686 /* packet with unicast indication but broadcast recipient */
687 if (is_broadcast_ether_addr(ethhdr
->h_dest
))
690 /* packet with broadcast sender address */
691 if (is_broadcast_ether_addr(ethhdr
->h_source
))
694 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_ROAM_ADV_RX
);
696 roam_adv_packet
= (struct batadv_roam_adv_packet
*)skb
->data
;
698 if (!batadv_is_my_mac(roam_adv_packet
->dst
))
699 return batadv_route_unicast_packet(skb
, recv_if
);
701 /* check if it is a backbone gateway. we don't accept
702 * roaming advertisement from it, as it has the same
703 * entries as we have.
705 if (batadv_bla_is_backbone_gw_orig(bat_priv
, roam_adv_packet
->src
))
708 orig_node
= batadv_orig_hash_find(bat_priv
, roam_adv_packet
->src
);
712 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
713 "Received ROAMING_ADV from %pM (client %pM)\n",
714 roam_adv_packet
->src
, roam_adv_packet
->client
);
716 batadv_tt_global_add(bat_priv
, orig_node
, roam_adv_packet
->client
,
717 BATADV_TT_CLIENT_ROAM
,
718 atomic_read(&orig_node
->last_ttvn
) + 1);
720 /* Roaming phase starts: I have new information but the ttvn has not
721 * been incremented yet. This flag will make me check all the incoming
722 * packets for the correct destination.
724 bat_priv
->tt_poss_change
= true;
726 batadv_orig_node_free_ref(orig_node
);
728 /* returning NET_RX_DROP will make the caller function kfree the skb */
732 /* find a suitable router for this originator, and use
733 * bonding if possible. increases the found neighbors
736 struct batadv_neigh_node
*
737 batadv_find_router(struct batadv_priv
*bat_priv
,
738 struct batadv_orig_node
*orig_node
,
739 const struct batadv_hard_iface
*recv_if
)
741 struct batadv_orig_node
*primary_orig_node
;
742 struct batadv_orig_node
*router_orig
;
743 struct batadv_neigh_node
*router
;
744 static uint8_t zero_mac
[ETH_ALEN
] = {0, 0, 0, 0, 0, 0};
746 uint8_t *primary_addr
;
751 router
= batadv_orig_node_get_router(orig_node
);
755 /* without bonding, the first node should
756 * always choose the default router.
758 bonding_enabled
= atomic_read(&bat_priv
->bonding
);
761 /* select default router to output */
762 router_orig
= router
->orig_node
;
766 if ((!recv_if
) && (!bonding_enabled
))
769 primary_addr
= router_orig
->primary_addr
;
771 /* if we have something in the primary_addr, we can search
772 * for a potential bonding candidate.
774 if (batadv_compare_eth(primary_addr
, zero_mac
))
777 /* find the orig_node which has the primary interface. might
778 * even be the same as our router_orig in many cases
780 if (batadv_compare_eth(primary_addr
, router_orig
->orig
)) {
781 primary_orig_node
= router_orig
;
783 primary_orig_node
= batadv_orig_hash_find(bat_priv
,
785 if (!primary_orig_node
)
788 batadv_orig_node_free_ref(primary_orig_node
);
791 /* with less than 2 candidates, we can't do any
792 * bonding and prefer the original router.
794 if (atomic_read(&primary_orig_node
->bond_candidates
) < 2)
797 /* all nodes between should choose a candidate which
798 * is is not on the interface where the packet came
801 batadv_neigh_node_free_ref(router
);
804 router
= batadv_find_bond_router(primary_orig_node
, recv_if
);
806 router
= batadv_find_ifalter_router(primary_orig_node
, recv_if
);
809 if (router
&& router
->if_incoming
->if_status
!= BATADV_IF_ACTIVE
)
818 batadv_neigh_node_free_ref(router
);
822 static int batadv_check_unicast_packet(struct sk_buff
*skb
, int hdr_size
)
824 struct ethhdr
*ethhdr
;
826 /* drop packet if it has not necessary minimum size */
827 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
830 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
832 /* packet with unicast indication but broadcast recipient */
833 if (is_broadcast_ether_addr(ethhdr
->h_dest
))
836 /* packet with broadcast sender address */
837 if (is_broadcast_ether_addr(ethhdr
->h_source
))
841 if (!batadv_is_my_mac(ethhdr
->h_dest
))
847 static int batadv_route_unicast_packet(struct sk_buff
*skb
,
848 struct batadv_hard_iface
*recv_if
)
850 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
851 struct batadv_orig_node
*orig_node
= NULL
;
852 struct batadv_neigh_node
*neigh_node
= NULL
;
853 struct batadv_unicast_packet
*unicast_packet
;
854 struct ethhdr
*ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
855 int ret
= NET_RX_DROP
;
856 struct sk_buff
*new_skb
;
858 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
861 if (unicast_packet
->header
.ttl
< 2) {
862 pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n",
863 ethhdr
->h_source
, unicast_packet
->dest
);
867 /* get routing information */
868 orig_node
= batadv_orig_hash_find(bat_priv
, unicast_packet
->dest
);
873 /* find_router() increases neigh_nodes refcount if found. */
874 neigh_node
= batadv_find_router(bat_priv
, orig_node
, recv_if
);
879 /* create a copy of the skb, if needed, to modify it. */
880 if (skb_cow(skb
, ETH_HLEN
) < 0)
883 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
885 if (unicast_packet
->header
.packet_type
== BATADV_UNICAST
&&
886 atomic_read(&bat_priv
->fragmentation
) &&
887 skb
->len
> neigh_node
->if_incoming
->net_dev
->mtu
) {
888 ret
= batadv_frag_send_skb(skb
, bat_priv
,
889 neigh_node
->if_incoming
,
894 if (unicast_packet
->header
.packet_type
== BATADV_UNICAST_FRAG
&&
895 batadv_frag_can_reassemble(skb
,
896 neigh_node
->if_incoming
->net_dev
->mtu
)) {
898 ret
= batadv_frag_reassemble_skb(skb
, bat_priv
, &new_skb
);
900 if (ret
== NET_RX_DROP
)
903 /* packet was buffered for late merge */
905 ret
= NET_RX_SUCCESS
;
910 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
914 unicast_packet
->header
.ttl
--;
916 /* Update stats counter */
917 batadv_inc_counter(bat_priv
, BATADV_CNT_FORWARD
);
918 batadv_add_counter(bat_priv
, BATADV_CNT_FORWARD_BYTES
,
919 skb
->len
+ ETH_HLEN
);
922 batadv_send_skb_packet(skb
, neigh_node
->if_incoming
, neigh_node
->addr
);
923 ret
= NET_RX_SUCCESS
;
927 batadv_neigh_node_free_ref(neigh_node
);
929 batadv_orig_node_free_ref(orig_node
);
933 static int batadv_check_unicast_ttvn(struct batadv_priv
*bat_priv
,
934 struct sk_buff
*skb
) {
936 struct batadv_orig_node
*orig_node
;
937 struct ethhdr
*ethhdr
;
938 struct batadv_hard_iface
*primary_if
;
939 struct batadv_unicast_packet
*unicast_packet
;
943 /* I could need to modify it */
944 if (skb_cow(skb
, sizeof(struct batadv_unicast_packet
)) < 0)
947 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
949 if (batadv_is_my_mac(unicast_packet
->dest
)) {
950 tt_poss_change
= bat_priv
->tt_poss_change
;
951 curr_ttvn
= (uint8_t)atomic_read(&bat_priv
->ttvn
);
953 orig_node
= batadv_orig_hash_find(bat_priv
,
954 unicast_packet
->dest
);
959 curr_ttvn
= (uint8_t)atomic_read(&orig_node
->last_ttvn
);
960 tt_poss_change
= orig_node
->tt_poss_change
;
961 batadv_orig_node_free_ref(orig_node
);
964 /* Check whether I have to reroute the packet */
965 is_old_ttvn
= batadv_seq_before(unicast_packet
->ttvn
, curr_ttvn
);
966 if (is_old_ttvn
|| tt_poss_change
) {
967 /* check if there is enough data before accessing it */
968 if (pskb_may_pull(skb
, sizeof(struct batadv_unicast_packet
) +
972 ethhdr
= (struct ethhdr
*)(skb
->data
+ sizeof(*unicast_packet
));
974 /* we don't have an updated route for this client, so we should
975 * not try to reroute the packet!!
977 if (batadv_tt_global_client_is_roaming(bat_priv
,
981 orig_node
= batadv_transtable_search(bat_priv
, NULL
,
985 if (!batadv_is_my_client(bat_priv
, ethhdr
->h_dest
))
987 primary_if
= batadv_primary_if_get_selected(bat_priv
);
990 memcpy(unicast_packet
->dest
,
991 primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
992 batadv_hardif_free_ref(primary_if
);
994 memcpy(unicast_packet
->dest
, orig_node
->orig
,
996 curr_ttvn
= (uint8_t)
997 atomic_read(&orig_node
->last_ttvn
);
998 batadv_orig_node_free_ref(orig_node
);
1001 batadv_dbg(BATADV_DBG_ROUTES
, bat_priv
,
1002 "TTVN mismatch (old_ttvn %u new_ttvn %u)! Rerouting unicast packet (for %pM) to %pM\n",
1003 unicast_packet
->ttvn
, curr_ttvn
, ethhdr
->h_dest
,
1004 unicast_packet
->dest
);
1006 unicast_packet
->ttvn
= curr_ttvn
;
1011 int batadv_recv_unicast_packet(struct sk_buff
*skb
,
1012 struct batadv_hard_iface
*recv_if
)
1014 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1015 struct batadv_unicast_packet
*unicast_packet
;
1016 int hdr_size
= sizeof(*unicast_packet
);
1018 if (batadv_check_unicast_packet(skb
, hdr_size
) < 0)
1021 if (!batadv_check_unicast_ttvn(bat_priv
, skb
))
1024 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
1027 if (batadv_is_my_mac(unicast_packet
->dest
)) {
1028 batadv_interface_rx(recv_if
->soft_iface
, skb
, recv_if
,
1030 return NET_RX_SUCCESS
;
1033 return batadv_route_unicast_packet(skb
, recv_if
);
1036 int batadv_recv_ucast_frag_packet(struct sk_buff
*skb
,
1037 struct batadv_hard_iface
*recv_if
)
1039 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1040 struct batadv_unicast_frag_packet
*unicast_packet
;
1041 int hdr_size
= sizeof(*unicast_packet
);
1042 struct sk_buff
*new_skb
= NULL
;
1045 if (batadv_check_unicast_packet(skb
, hdr_size
) < 0)
1048 if (!batadv_check_unicast_ttvn(bat_priv
, skb
))
1051 unicast_packet
= (struct batadv_unicast_frag_packet
*)skb
->data
;
1054 if (batadv_is_my_mac(unicast_packet
->dest
)) {
1056 ret
= batadv_frag_reassemble_skb(skb
, bat_priv
, &new_skb
);
1058 if (ret
== NET_RX_DROP
)
1061 /* packet was buffered for late merge */
1063 return NET_RX_SUCCESS
;
1065 batadv_interface_rx(recv_if
->soft_iface
, new_skb
, recv_if
,
1066 sizeof(struct batadv_unicast_packet
));
1067 return NET_RX_SUCCESS
;
1070 return batadv_route_unicast_packet(skb
, recv_if
);
1074 int batadv_recv_bcast_packet(struct sk_buff
*skb
,
1075 struct batadv_hard_iface
*recv_if
)
1077 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1078 struct batadv_orig_node
*orig_node
= NULL
;
1079 struct batadv_bcast_packet
*bcast_packet
;
1080 struct ethhdr
*ethhdr
;
1081 int hdr_size
= sizeof(*bcast_packet
);
1082 int ret
= NET_RX_DROP
;
1085 /* drop packet if it has not necessary minimum size */
1086 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
1089 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
1091 /* packet with broadcast indication but unicast recipient */
1092 if (!is_broadcast_ether_addr(ethhdr
->h_dest
))
1095 /* packet with broadcast sender address */
1096 if (is_broadcast_ether_addr(ethhdr
->h_source
))
1099 /* ignore broadcasts sent by myself */
1100 if (batadv_is_my_mac(ethhdr
->h_source
))
1103 bcast_packet
= (struct batadv_bcast_packet
*)skb
->data
;
1105 /* ignore broadcasts originated by myself */
1106 if (batadv_is_my_mac(bcast_packet
->orig
))
1109 if (bcast_packet
->header
.ttl
< 2)
1112 orig_node
= batadv_orig_hash_find(bat_priv
, bcast_packet
->orig
);
1117 spin_lock_bh(&orig_node
->bcast_seqno_lock
);
1119 /* check whether the packet is a duplicate */
1120 if (batadv_test_bit(orig_node
->bcast_bits
, orig_node
->last_bcast_seqno
,
1121 ntohl(bcast_packet
->seqno
)))
1124 seq_diff
= ntohl(bcast_packet
->seqno
) - orig_node
->last_bcast_seqno
;
1126 /* check whether the packet is old and the host just restarted. */
1127 if (batadv_window_protected(bat_priv
, seq_diff
,
1128 &orig_node
->bcast_seqno_reset
))
1131 /* mark broadcast in flood history, update window position
1134 if (batadv_bit_get_packet(bat_priv
, orig_node
->bcast_bits
, seq_diff
, 1))
1135 orig_node
->last_bcast_seqno
= ntohl(bcast_packet
->seqno
);
1137 spin_unlock_bh(&orig_node
->bcast_seqno_lock
);
1139 /* check whether this has been sent by another originator before */
1140 if (batadv_bla_check_bcast_duplist(bat_priv
, bcast_packet
, hdr_size
))
1143 /* rebroadcast packet */
1144 batadv_add_bcast_packet_to_list(bat_priv
, skb
, 1);
1146 /* don't hand the broadcast up if it is from an originator
1147 * from the same backbone.
1149 if (batadv_bla_is_backbone_gw(skb
, orig_node
, hdr_size
))
1152 /* broadcast for me */
1153 batadv_interface_rx(recv_if
->soft_iface
, skb
, recv_if
, hdr_size
);
1154 ret
= NET_RX_SUCCESS
;
1158 spin_unlock_bh(&orig_node
->bcast_seqno_lock
);
1161 batadv_orig_node_free_ref(orig_node
);
1165 int batadv_recv_vis_packet(struct sk_buff
*skb
,
1166 struct batadv_hard_iface
*recv_if
)
1168 struct batadv_vis_packet
*vis_packet
;
1169 struct ethhdr
*ethhdr
;
1170 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1171 int hdr_size
= sizeof(*vis_packet
);
1173 /* keep skb linear */
1174 if (skb_linearize(skb
) < 0)
1177 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
1180 vis_packet
= (struct batadv_vis_packet
*)skb
->data
;
1181 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
1184 if (!batadv_is_my_mac(ethhdr
->h_dest
))
1187 /* ignore own packets */
1188 if (batadv_is_my_mac(vis_packet
->vis_orig
))
1191 if (batadv_is_my_mac(vis_packet
->sender_orig
))
1194 switch (vis_packet
->vis_type
) {
1195 case BATADV_VIS_TYPE_SERVER_SYNC
:
1196 batadv_receive_server_sync_packet(bat_priv
, vis_packet
,
1200 case BATADV_VIS_TYPE_CLIENT_UPDATE
:
1201 batadv_receive_client_update_packet(bat_priv
, vis_packet
,
1205 default: /* ignore unknown packet */
1209 /* We take a copy of the data in the packet, so we should
1210 * always free the skbuf.