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(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(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 sk_buff
*skb
, int hdr_size
)
553 struct ethhdr
*ethhdr
;
555 /* drop packet if it has not necessary minimum size */
556 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
559 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
561 /* packet with unicast indication but broadcast recipient */
562 if (is_broadcast_ether_addr(ethhdr
->h_dest
))
565 /* packet with broadcast sender address */
566 if (is_broadcast_ether_addr(ethhdr
->h_source
))
570 if (!batadv_is_my_mac(ethhdr
->h_dest
))
576 int batadv_recv_tt_query(struct sk_buff
*skb
, struct batadv_hard_iface
*recv_if
)
578 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
579 struct batadv_tt_query_packet
*tt_query
;
581 int hdr_size
= sizeof(*tt_query
);
585 if (batadv_check_unicast_packet(skb
, hdr_size
) < 0)
588 /* I could need to modify it */
589 if (skb_cow(skb
, sizeof(struct batadv_tt_query_packet
)) < 0)
592 tt_query
= (struct batadv_tt_query_packet
*)skb
->data
;
594 switch (tt_query
->flags
& BATADV_TT_QUERY_TYPE_MASK
) {
595 case BATADV_TT_REQUEST
:
596 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_REQUEST_RX
);
598 /* If we cannot provide an answer the tt_request is
601 if (!batadv_send_tt_response(bat_priv
, tt_query
)) {
602 if (tt_query
->flags
& BATADV_TT_FULL_TABLE
)
607 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
608 "Routing TT_REQUEST to %pM [%c]\n",
611 return batadv_route_unicast_packet(skb
, recv_if
);
614 case BATADV_TT_RESPONSE
:
615 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_RESPONSE_RX
);
617 if (batadv_is_my_mac(tt_query
->dst
)) {
618 /* packet needs to be linearized to access the TT
621 if (skb_linearize(skb
) < 0)
623 /* skb_linearize() possibly changed skb->data */
624 tt_query
= (struct batadv_tt_query_packet
*)skb
->data
;
626 tt_size
= batadv_tt_len(ntohs(tt_query
->tt_data
));
628 /* Ensure we have all the claimed data */
629 packet_size
= sizeof(struct batadv_tt_query_packet
);
630 packet_size
+= tt_size
;
631 if (unlikely(skb_headlen(skb
) < packet_size
))
634 batadv_handle_tt_response(bat_priv
, tt_query
);
636 if (tt_query
->flags
& BATADV_TT_FULL_TABLE
)
640 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
641 "Routing TT_RESPONSE to %pM [%c]\n",
644 return batadv_route_unicast_packet(skb
, recv_if
);
650 /* returning NET_RX_DROP will make the caller function kfree the skb */
654 int batadv_recv_roam_adv(struct sk_buff
*skb
, struct batadv_hard_iface
*recv_if
)
656 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
657 struct batadv_roam_adv_packet
*roam_adv_packet
;
658 struct batadv_orig_node
*orig_node
;
660 if (batadv_check_unicast_packet(skb
, sizeof(*roam_adv_packet
)) < 0)
663 batadv_inc_counter(bat_priv
, BATADV_CNT_TT_ROAM_ADV_RX
);
665 roam_adv_packet
= (struct batadv_roam_adv_packet
*)skb
->data
;
667 if (!batadv_is_my_mac(roam_adv_packet
->dst
))
668 return batadv_route_unicast_packet(skb
, recv_if
);
670 /* check if it is a backbone gateway. we don't accept
671 * roaming advertisement from it, as it has the same
672 * entries as we have.
674 if (batadv_bla_is_backbone_gw_orig(bat_priv
, roam_adv_packet
->src
))
677 orig_node
= batadv_orig_hash_find(bat_priv
, roam_adv_packet
->src
);
681 batadv_dbg(BATADV_DBG_TT
, bat_priv
,
682 "Received ROAMING_ADV from %pM (client %pM)\n",
683 roam_adv_packet
->src
, roam_adv_packet
->client
);
685 batadv_tt_global_add(bat_priv
, orig_node
, roam_adv_packet
->client
,
686 BATADV_TT_CLIENT_ROAM
,
687 atomic_read(&orig_node
->last_ttvn
) + 1);
689 batadv_orig_node_free_ref(orig_node
);
691 /* returning NET_RX_DROP will make the caller function kfree the skb */
695 /* find a suitable router for this originator, and use
696 * bonding if possible. increases the found neighbors
699 struct batadv_neigh_node
*
700 batadv_find_router(struct batadv_priv
*bat_priv
,
701 struct batadv_orig_node
*orig_node
,
702 const struct batadv_hard_iface
*recv_if
)
704 struct batadv_orig_node
*primary_orig_node
;
705 struct batadv_orig_node
*router_orig
;
706 struct batadv_neigh_node
*router
;
707 static uint8_t zero_mac
[ETH_ALEN
] = {0, 0, 0, 0, 0, 0};
709 uint8_t *primary_addr
;
714 router
= batadv_orig_node_get_router(orig_node
);
718 /* without bonding, the first node should
719 * always choose the default router.
721 bonding_enabled
= atomic_read(&bat_priv
->bonding
);
724 /* select default router to output */
725 router_orig
= router
->orig_node
;
729 if ((!recv_if
) && (!bonding_enabled
))
732 primary_addr
= router_orig
->primary_addr
;
734 /* if we have something in the primary_addr, we can search
735 * for a potential bonding candidate.
737 if (batadv_compare_eth(primary_addr
, zero_mac
))
740 /* find the orig_node which has the primary interface. might
741 * even be the same as our router_orig in many cases
743 if (batadv_compare_eth(primary_addr
, router_orig
->orig
)) {
744 primary_orig_node
= router_orig
;
746 primary_orig_node
= batadv_orig_hash_find(bat_priv
,
748 if (!primary_orig_node
)
751 batadv_orig_node_free_ref(primary_orig_node
);
754 /* with less than 2 candidates, we can't do any
755 * bonding and prefer the original router.
757 if (atomic_read(&primary_orig_node
->bond_candidates
) < 2)
760 /* all nodes between should choose a candidate which
761 * is is not on the interface where the packet came
764 batadv_neigh_node_free_ref(router
);
767 router
= batadv_find_bond_router(primary_orig_node
, recv_if
);
769 router
= batadv_find_ifalter_router(primary_orig_node
, recv_if
);
772 if (router
&& router
->if_incoming
->if_status
!= BATADV_IF_ACTIVE
)
781 batadv_neigh_node_free_ref(router
);
785 static int batadv_route_unicast_packet(struct sk_buff
*skb
,
786 struct batadv_hard_iface
*recv_if
)
788 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
789 struct batadv_orig_node
*orig_node
= NULL
;
790 struct batadv_neigh_node
*neigh_node
= NULL
;
791 struct batadv_unicast_packet
*unicast_packet
;
792 struct ethhdr
*ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
793 int ret
= NET_RX_DROP
;
794 struct sk_buff
*new_skb
;
796 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
799 if (unicast_packet
->header
.ttl
< 2) {
800 pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n",
801 ethhdr
->h_source
, unicast_packet
->dest
);
805 /* get routing information */
806 orig_node
= batadv_orig_hash_find(bat_priv
, unicast_packet
->dest
);
811 /* find_router() increases neigh_nodes refcount if found. */
812 neigh_node
= batadv_find_router(bat_priv
, orig_node
, recv_if
);
817 /* create a copy of the skb, if needed, to modify it. */
818 if (skb_cow(skb
, ETH_HLEN
) < 0)
821 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
823 if (unicast_packet
->header
.packet_type
== BATADV_UNICAST
&&
824 atomic_read(&bat_priv
->fragmentation
) &&
825 skb
->len
> neigh_node
->if_incoming
->net_dev
->mtu
) {
826 ret
= batadv_frag_send_skb(skb
, bat_priv
,
827 neigh_node
->if_incoming
,
832 if (unicast_packet
->header
.packet_type
== BATADV_UNICAST_FRAG
&&
833 batadv_frag_can_reassemble(skb
,
834 neigh_node
->if_incoming
->net_dev
->mtu
)) {
835 ret
= batadv_frag_reassemble_skb(skb
, bat_priv
, &new_skb
);
837 if (ret
== NET_RX_DROP
)
840 /* packet was buffered for late merge */
842 ret
= NET_RX_SUCCESS
;
847 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
851 unicast_packet
->header
.ttl
--;
853 /* Update stats counter */
854 batadv_inc_counter(bat_priv
, BATADV_CNT_FORWARD
);
855 batadv_add_counter(bat_priv
, BATADV_CNT_FORWARD_BYTES
,
856 skb
->len
+ ETH_HLEN
);
859 if (batadv_send_skb_to_orig(skb
, orig_node
, recv_if
))
860 ret
= NET_RX_SUCCESS
;
864 batadv_neigh_node_free_ref(neigh_node
);
866 batadv_orig_node_free_ref(orig_node
);
871 * batadv_reroute_unicast_packet - update the unicast header for re-routing
872 * @bat_priv: the bat priv with all the soft interface information
873 * @unicast_packet: the unicast header to be updated
874 * @dst_addr: the payload destination
876 * Search the translation table for dst_addr and update the unicast header with
877 * the new corresponding information (originator address where the destination
878 * client currently is and its known TTVN)
880 * Returns true if the packet header has been updated, false otherwise
883 batadv_reroute_unicast_packet(struct batadv_priv
*bat_priv
,
884 struct batadv_unicast_packet
*unicast_packet
,
887 struct batadv_orig_node
*orig_node
= NULL
;
888 struct batadv_hard_iface
*primary_if
= NULL
;
890 uint8_t *orig_addr
, orig_ttvn
;
892 if (batadv_is_my_client(bat_priv
, dst_addr
)) {
893 primary_if
= batadv_primary_if_get_selected(bat_priv
);
896 orig_addr
= primary_if
->net_dev
->dev_addr
;
897 orig_ttvn
= (uint8_t)atomic_read(&bat_priv
->tt
.vn
);
899 orig_node
= batadv_transtable_search(bat_priv
, NULL
, dst_addr
);
903 if (batadv_compare_eth(orig_node
->orig
, unicast_packet
->dest
))
906 orig_addr
= orig_node
->orig
;
907 orig_ttvn
= (uint8_t)atomic_read(&orig_node
->last_ttvn
);
910 /* update the packet header */
911 memcpy(unicast_packet
->dest
, orig_addr
, ETH_ALEN
);
912 unicast_packet
->ttvn
= orig_ttvn
;
917 batadv_hardif_free_ref(primary_if
);
919 batadv_orig_node_free_ref(orig_node
);
924 static int batadv_check_unicast_ttvn(struct batadv_priv
*bat_priv
,
925 struct sk_buff
*skb
) {
926 uint8_t curr_ttvn
, old_ttvn
;
927 struct batadv_orig_node
*orig_node
;
928 struct ethhdr
*ethhdr
;
929 struct batadv_hard_iface
*primary_if
;
930 struct batadv_unicast_packet
*unicast_packet
;
933 /* check if there is enough data before accessing it */
934 if (pskb_may_pull(skb
, sizeof(*unicast_packet
) + ETH_HLEN
) < 0)
937 /* create a copy of the skb (in case of for re-routing) to modify it. */
938 if (skb_cow(skb
, sizeof(*unicast_packet
)) < 0)
941 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
942 ethhdr
= (struct ethhdr
*)(skb
->data
+ sizeof(*unicast_packet
));
944 /* check if the destination client was served by this node and it is now
945 * roaming. In this case, it means that the node has got a ROAM_ADV
946 * message and that it knows the new destination in the mesh to re-route
949 if (batadv_tt_local_client_is_roaming(bat_priv
, ethhdr
->h_dest
)) {
950 if (batadv_reroute_unicast_packet(bat_priv
, unicast_packet
,
952 net_ratelimited_function(batadv_dbg
, BATADV_DBG_TT
,
954 "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n",
955 unicast_packet
->dest
,
957 /* at this point the mesh destination should have been
958 * substituted with the originator address found in the global
959 * table. If not, let the packet go untouched anyway because
960 * there is nothing the node can do
965 /* retrieve the TTVN known by this node for the packet destination. This
966 * value is used later to check if the node which sent (or re-routed
967 * last time) the packet had an updated information or not
969 curr_ttvn
= (uint8_t)atomic_read(&bat_priv
->tt
.vn
);
970 if (!batadv_is_my_mac(unicast_packet
->dest
)) {
971 orig_node
= batadv_orig_hash_find(bat_priv
,
972 unicast_packet
->dest
);
973 /* if it is not possible to find the orig_node representing the
974 * destination, the packet can immediately be dropped as it will
975 * not be possible to deliver it
980 curr_ttvn
= (uint8_t)atomic_read(&orig_node
->last_ttvn
);
981 batadv_orig_node_free_ref(orig_node
);
984 /* check if the TTVN contained in the packet is fresher than what the
987 is_old_ttvn
= batadv_seq_before(unicast_packet
->ttvn
, curr_ttvn
);
991 old_ttvn
= unicast_packet
->ttvn
;
992 /* the packet was forged based on outdated network information. Its
993 * destination can possibly be updated and forwarded towards the new
996 if (batadv_reroute_unicast_packet(bat_priv
, unicast_packet
,
998 net_ratelimited_function(batadv_dbg
, BATADV_DBG_TT
, bat_priv
,
999 "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n",
1000 unicast_packet
->dest
, ethhdr
->h_dest
,
1001 old_ttvn
, curr_ttvn
);
1005 /* the packet has not been re-routed: either the destination is
1006 * currently served by this node or there is no destination at all and
1007 * it is possible to drop the packet
1009 if (!batadv_is_my_client(bat_priv
, ethhdr
->h_dest
))
1012 /* update the header in order to let the packet be delivered to this
1013 * node's soft interface
1015 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1019 memcpy(unicast_packet
->dest
, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
1021 batadv_hardif_free_ref(primary_if
);
1023 unicast_packet
->ttvn
= curr_ttvn
;
1028 int batadv_recv_unicast_packet(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_packet
*unicast_packet
;
1033 struct batadv_unicast_4addr_packet
*unicast_4addr_packet
;
1035 struct batadv_orig_node
*orig_node
= NULL
;
1036 int hdr_size
= sizeof(*unicast_packet
);
1039 unicast_packet
= (struct batadv_unicast_packet
*)skb
->data
;
1040 unicast_4addr_packet
= (struct batadv_unicast_4addr_packet
*)skb
->data
;
1042 is4addr
= unicast_packet
->header
.packet_type
== BATADV_UNICAST_4ADDR
;
1043 /* the caller function should have already pulled 2 bytes */
1045 hdr_size
= sizeof(*unicast_4addr_packet
);
1047 if (batadv_check_unicast_packet(skb
, hdr_size
) < 0)
1050 if (!batadv_check_unicast_ttvn(bat_priv
, skb
))
1054 if (batadv_is_my_mac(unicast_packet
->dest
)) {
1056 batadv_dat_inc_counter(bat_priv
,
1057 unicast_4addr_packet
->subtype
);
1058 orig_addr
= unicast_4addr_packet
->src
;
1059 orig_node
= batadv_orig_hash_find(bat_priv
, orig_addr
);
1062 if (batadv_dat_snoop_incoming_arp_request(bat_priv
, skb
,
1065 if (batadv_dat_snoop_incoming_arp_reply(bat_priv
, skb
,
1069 batadv_interface_rx(recv_if
->soft_iface
, skb
, recv_if
, hdr_size
,
1074 batadv_orig_node_free_ref(orig_node
);
1076 return NET_RX_SUCCESS
;
1079 return batadv_route_unicast_packet(skb
, recv_if
);
1082 int batadv_recv_ucast_frag_packet(struct sk_buff
*skb
,
1083 struct batadv_hard_iface
*recv_if
)
1085 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1086 struct batadv_unicast_frag_packet
*unicast_packet
;
1087 int hdr_size
= sizeof(*unicast_packet
);
1088 struct sk_buff
*new_skb
= NULL
;
1091 if (batadv_check_unicast_packet(skb
, hdr_size
) < 0)
1094 if (!batadv_check_unicast_ttvn(bat_priv
, skb
))
1097 unicast_packet
= (struct batadv_unicast_frag_packet
*)skb
->data
;
1100 if (batadv_is_my_mac(unicast_packet
->dest
)) {
1101 ret
= batadv_frag_reassemble_skb(skb
, bat_priv
, &new_skb
);
1103 if (ret
== NET_RX_DROP
)
1106 /* packet was buffered for late merge */
1108 return NET_RX_SUCCESS
;
1110 if (batadv_dat_snoop_incoming_arp_request(bat_priv
, new_skb
,
1113 if (batadv_dat_snoop_incoming_arp_reply(bat_priv
, new_skb
,
1117 batadv_interface_rx(recv_if
->soft_iface
, new_skb
, recv_if
,
1118 sizeof(struct batadv_unicast_packet
), NULL
);
1121 return NET_RX_SUCCESS
;
1124 return batadv_route_unicast_packet(skb
, recv_if
);
1128 int batadv_recv_bcast_packet(struct sk_buff
*skb
,
1129 struct batadv_hard_iface
*recv_if
)
1131 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1132 struct batadv_orig_node
*orig_node
= NULL
;
1133 struct batadv_bcast_packet
*bcast_packet
;
1134 struct ethhdr
*ethhdr
;
1135 int hdr_size
= sizeof(*bcast_packet
);
1136 int ret
= NET_RX_DROP
;
1139 /* drop packet if it has not necessary minimum size */
1140 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
1143 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
1145 /* packet with broadcast indication but unicast recipient */
1146 if (!is_broadcast_ether_addr(ethhdr
->h_dest
))
1149 /* packet with broadcast sender address */
1150 if (is_broadcast_ether_addr(ethhdr
->h_source
))
1153 /* ignore broadcasts sent by myself */
1154 if (batadv_is_my_mac(ethhdr
->h_source
))
1157 bcast_packet
= (struct batadv_bcast_packet
*)skb
->data
;
1159 /* ignore broadcasts originated by myself */
1160 if (batadv_is_my_mac(bcast_packet
->orig
))
1163 if (bcast_packet
->header
.ttl
< 2)
1166 orig_node
= batadv_orig_hash_find(bat_priv
, bcast_packet
->orig
);
1171 spin_lock_bh(&orig_node
->bcast_seqno_lock
);
1173 /* check whether the packet is a duplicate */
1174 if (batadv_test_bit(orig_node
->bcast_bits
, orig_node
->last_bcast_seqno
,
1175 ntohl(bcast_packet
->seqno
)))
1178 seq_diff
= ntohl(bcast_packet
->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
= ntohl(bcast_packet
->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 /* rebroadcast packet */
1198 batadv_add_bcast_packet_to_list(bat_priv
, skb
, 1);
1200 /* don't hand the broadcast up if it is from an originator
1201 * from the same backbone.
1203 if (batadv_bla_is_backbone_gw(skb
, orig_node
, hdr_size
))
1206 if (batadv_dat_snoop_incoming_arp_request(bat_priv
, skb
, hdr_size
))
1208 if (batadv_dat_snoop_incoming_arp_reply(bat_priv
, skb
, hdr_size
))
1211 /* broadcast for me */
1212 batadv_interface_rx(recv_if
->soft_iface
, skb
, recv_if
, hdr_size
,
1216 ret
= NET_RX_SUCCESS
;
1220 spin_unlock_bh(&orig_node
->bcast_seqno_lock
);
1223 batadv_orig_node_free_ref(orig_node
);
1227 int batadv_recv_vis_packet(struct sk_buff
*skb
,
1228 struct batadv_hard_iface
*recv_if
)
1230 struct batadv_vis_packet
*vis_packet
;
1231 struct ethhdr
*ethhdr
;
1232 struct batadv_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1233 int hdr_size
= sizeof(*vis_packet
);
1235 /* keep skb linear */
1236 if (skb_linearize(skb
) < 0)
1239 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
1242 vis_packet
= (struct batadv_vis_packet
*)skb
->data
;
1243 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
1246 if (!batadv_is_my_mac(ethhdr
->h_dest
))
1249 /* ignore own packets */
1250 if (batadv_is_my_mac(vis_packet
->vis_orig
))
1253 if (batadv_is_my_mac(vis_packet
->sender_orig
))
1256 switch (vis_packet
->vis_type
) {
1257 case BATADV_VIS_TYPE_SERVER_SYNC
:
1258 batadv_receive_server_sync_packet(bat_priv
, vis_packet
,
1262 case BATADV_VIS_TYPE_CLIENT_UPDATE
:
1263 batadv_receive_client_update_packet(bat_priv
, vis_packet
,
1267 default: /* ignore unknown packet */
1271 /* We take a copy of the data in the packet, so we should
1272 * always free the skbuf.