2 * Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
4 * Marek Lindner, Simon Wunderlich
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of version 2 of the GNU General Public
8 * License as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
25 #include "soft-interface.h"
26 #include "hard-interface.h"
27 #include "icmp_socket.h"
28 #include "translation-table.h"
29 #include "originator.h"
32 #include "bridge_loop_avoidance.h"
34 static int route_unicast_packet(struct sk_buff
*skb
,
35 struct hard_iface
*recv_if
);
37 void slide_own_bcast_window(struct hard_iface
*hard_iface
)
39 struct bat_priv
*bat_priv
= netdev_priv(hard_iface
->soft_iface
);
40 struct hashtable_t
*hash
= bat_priv
->orig_hash
;
41 struct hlist_node
*node
;
42 struct hlist_head
*head
;
43 struct orig_node
*orig_node
;
48 for (i
= 0; i
< hash
->size
; i
++) {
49 head
= &hash
->table
[i
];
52 hlist_for_each_entry_rcu(orig_node
, node
, head
, hash_entry
) {
53 spin_lock_bh(&orig_node
->ogm_cnt_lock
);
54 word_index
= hard_iface
->if_num
* NUM_WORDS
;
55 word
= &(orig_node
->bcast_own
[word_index
]);
57 bit_get_packet(bat_priv
, word
, 1, 0);
58 orig_node
->bcast_own_sum
[hard_iface
->if_num
] =
59 bitmap_weight(word
, TQ_LOCAL_WINDOW_SIZE
);
60 spin_unlock_bh(&orig_node
->ogm_cnt_lock
);
66 static void _update_route(struct bat_priv
*bat_priv
,
67 struct orig_node
*orig_node
,
68 struct neigh_node
*neigh_node
)
70 struct neigh_node
*curr_router
;
72 curr_router
= orig_node_get_router(orig_node
);
75 if ((curr_router
) && (!neigh_node
)) {
76 bat_dbg(DBG_ROUTES
, bat_priv
, "Deleting route towards: %pM\n",
78 tt_global_del_orig(bat_priv
, orig_node
,
79 "Deleted route towards originator");
82 } else if ((!curr_router
) && (neigh_node
)) {
84 bat_dbg(DBG_ROUTES
, bat_priv
,
85 "Adding route towards: %pM (via %pM)\n",
86 orig_node
->orig
, neigh_node
->addr
);
88 } else if (neigh_node
&& curr_router
) {
89 bat_dbg(DBG_ROUTES
, bat_priv
,
90 "Changing route towards: %pM (now via %pM - was via %pM)\n",
91 orig_node
->orig
, neigh_node
->addr
,
96 neigh_node_free_ref(curr_router
);
98 /* increase refcount of new best neighbor */
99 if (neigh_node
&& !atomic_inc_not_zero(&neigh_node
->refcount
))
102 spin_lock_bh(&orig_node
->neigh_list_lock
);
103 rcu_assign_pointer(orig_node
->router
, neigh_node
);
104 spin_unlock_bh(&orig_node
->neigh_list_lock
);
106 /* decrease refcount of previous best neighbor */
108 neigh_node_free_ref(curr_router
);
111 void update_route(struct bat_priv
*bat_priv
, struct orig_node
*orig_node
,
112 struct neigh_node
*neigh_node
)
114 struct neigh_node
*router
= NULL
;
119 router
= orig_node_get_router(orig_node
);
121 if (router
!= neigh_node
)
122 _update_route(bat_priv
, orig_node
, neigh_node
);
126 neigh_node_free_ref(router
);
129 /* caller must hold the neigh_list_lock */
130 void bonding_candidate_del(struct orig_node
*orig_node
,
131 struct 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 neigh_node_free_ref(neigh_node
);
140 atomic_dec(&orig_node
->bond_candidates
);
146 void bonding_candidate_add(struct orig_node
*orig_node
,
147 struct neigh_node
*neigh_node
)
149 struct hlist_node
*node
;
150 struct 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 (!compare_eth(orig_node
->orig
,
157 neigh_node
->orig_node
->primary_addr
))
160 router
= orig_node_get_router(orig_node
);
164 /* ... and is good enough to be considered */
165 if (neigh_node
->tq_avg
< router
->tq_avg
- BONDING_TQ_THRESHOLD
)
169 * check if we have another candidate with the same mac address or
170 * interface. If we do, we won't select this candidate because of
171 * possible interference.
173 hlist_for_each_entry_rcu(tmp_neigh_node
, node
,
174 &orig_node
->neigh_list
, list
) {
176 if (tmp_neigh_node
== neigh_node
)
179 /* we only care if the other candidate is even
180 * considered as candidate. */
181 if (list_empty(&tmp_neigh_node
->bonding_list
))
184 if ((neigh_node
->if_incoming
== tmp_neigh_node
->if_incoming
) ||
185 (compare_eth(neigh_node
->addr
, tmp_neigh_node
->addr
))) {
186 interference_candidate
= 1;
191 /* don't care further if it is an interference candidate */
192 if (interference_candidate
)
195 /* this neighbor already is part of our candidate list */
196 if (!list_empty(&neigh_node
->bonding_list
))
199 if (!atomic_inc_not_zero(&neigh_node
->refcount
))
202 list_add_rcu(&neigh_node
->bonding_list
, &orig_node
->bond_list
);
203 atomic_inc(&orig_node
->bond_candidates
);
207 bonding_candidate_del(orig_node
, neigh_node
);
210 spin_unlock_bh(&orig_node
->neigh_list_lock
);
213 neigh_node_free_ref(router
);
216 /* copy primary address for bonding */
217 void bonding_save_primary(const struct orig_node
*orig_node
,
218 struct orig_node
*orig_neigh_node
,
219 const struct batman_ogm_packet
*batman_ogm_packet
)
221 if (!(batman_ogm_packet
->flags
& PRIMARIES_FIRST_HOP
))
224 memcpy(orig_neigh_node
->primary_addr
, orig_node
->orig
, ETH_ALEN
);
227 /* checks whether the host restarted and is in the protection time.
229 * 0 if the packet is to be accepted
230 * 1 if the packet is to be ignored.
232 int window_protected(struct bat_priv
*bat_priv
, int32_t seq_num_diff
,
233 unsigned long *last_reset
)
235 if ((seq_num_diff
<= -TQ_LOCAL_WINDOW_SIZE
) ||
236 (seq_num_diff
>= EXPECTED_SEQNO_RANGE
)) {
237 if (!has_timed_out(*last_reset
, RESET_PROTECTION_MS
))
240 *last_reset
= jiffies
;
241 bat_dbg(DBG_BATMAN
, bat_priv
,
242 "old packet received, start protection\n");
248 bool check_management_packet(struct sk_buff
*skb
,
249 struct 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 recv_my_icmp_packet(struct bat_priv
*bat_priv
,
280 struct sk_buff
*skb
, size_t icmp_len
)
282 struct hard_iface
*primary_if
= NULL
;
283 struct orig_node
*orig_node
= NULL
;
284 struct neigh_node
*router
= NULL
;
285 struct icmp_packet_rr
*icmp_packet
;
286 int ret
= NET_RX_DROP
;
288 icmp_packet
= (struct icmp_packet_rr
*)skb
->data
;
290 /* add data to device queue */
291 if (icmp_packet
->msg_type
!= ECHO_REQUEST
) {
292 bat_socket_receive_packet(icmp_packet
, icmp_len
);
296 primary_if
= primary_if_get_selected(bat_priv
);
300 /* answer echo request (ping) */
301 /* get routing information */
302 orig_node
= orig_hash_find(bat_priv
, icmp_packet
->orig
);
306 router
= orig_node_get_router(orig_node
);
310 /* create a copy of the skb, if needed, to modify it. */
311 if (skb_cow(skb
, ETH_HLEN
) < 0)
314 icmp_packet
= (struct icmp_packet_rr
*)skb
->data
;
316 memcpy(icmp_packet
->dst
, icmp_packet
->orig
, ETH_ALEN
);
317 memcpy(icmp_packet
->orig
, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
318 icmp_packet
->msg_type
= ECHO_REPLY
;
319 icmp_packet
->header
.ttl
= TTL
;
321 send_skb_packet(skb
, router
->if_incoming
, router
->addr
);
322 ret
= NET_RX_SUCCESS
;
326 hardif_free_ref(primary_if
);
328 neigh_node_free_ref(router
);
330 orig_node_free_ref(orig_node
);
334 static int recv_icmp_ttl_exceeded(struct bat_priv
*bat_priv
,
337 struct hard_iface
*primary_if
= NULL
;
338 struct orig_node
*orig_node
= NULL
;
339 struct neigh_node
*router
= NULL
;
340 struct icmp_packet
*icmp_packet
;
341 int ret
= NET_RX_DROP
;
343 icmp_packet
= (struct icmp_packet
*)skb
->data
;
345 /* send TTL exceeded if packet is an echo request (traceroute) */
346 if (icmp_packet
->msg_type
!= ECHO_REQUEST
) {
347 pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n",
348 icmp_packet
->orig
, icmp_packet
->dst
);
352 primary_if
= primary_if_get_selected(bat_priv
);
356 /* get routing information */
357 orig_node
= orig_hash_find(bat_priv
, icmp_packet
->orig
);
361 router
= orig_node_get_router(orig_node
);
365 /* create a copy of the skb, if needed, to modify it. */
366 if (skb_cow(skb
, ETH_HLEN
) < 0)
369 icmp_packet
= (struct icmp_packet
*)skb
->data
;
371 memcpy(icmp_packet
->dst
, icmp_packet
->orig
, ETH_ALEN
);
372 memcpy(icmp_packet
->orig
, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
373 icmp_packet
->msg_type
= TTL_EXCEEDED
;
374 icmp_packet
->header
.ttl
= TTL
;
376 send_skb_packet(skb
, router
->if_incoming
, router
->addr
);
377 ret
= NET_RX_SUCCESS
;
381 hardif_free_ref(primary_if
);
383 neigh_node_free_ref(router
);
385 orig_node_free_ref(orig_node
);
390 int recv_icmp_packet(struct sk_buff
*skb
, struct hard_iface
*recv_if
)
392 struct bat_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
393 struct icmp_packet_rr
*icmp_packet
;
394 struct ethhdr
*ethhdr
;
395 struct orig_node
*orig_node
= NULL
;
396 struct neigh_node
*router
= NULL
;
397 int hdr_size
= sizeof(struct icmp_packet
);
398 int ret
= NET_RX_DROP
;
401 * we truncate all incoming icmp packets if they don't match our size
403 if (skb
->len
>= sizeof(struct icmp_packet_rr
))
404 hdr_size
= sizeof(struct icmp_packet_rr
);
406 /* drop packet if it has not necessary minimum size */
407 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
410 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
412 /* packet with unicast indication but broadcast recipient */
413 if (is_broadcast_ether_addr(ethhdr
->h_dest
))
416 /* packet with broadcast sender address */
417 if (is_broadcast_ether_addr(ethhdr
->h_source
))
421 if (!is_my_mac(ethhdr
->h_dest
))
424 icmp_packet
= (struct icmp_packet_rr
*)skb
->data
;
426 /* add record route information if not full */
427 if ((hdr_size
== sizeof(struct icmp_packet_rr
)) &&
428 (icmp_packet
->rr_cur
< BAT_RR_LEN
)) {
429 memcpy(&(icmp_packet
->rr
[icmp_packet
->rr_cur
]),
430 ethhdr
->h_dest
, ETH_ALEN
);
431 icmp_packet
->rr_cur
++;
435 if (is_my_mac(icmp_packet
->dst
))
436 return recv_my_icmp_packet(bat_priv
, skb
, hdr_size
);
439 if (icmp_packet
->header
.ttl
< 2)
440 return recv_icmp_ttl_exceeded(bat_priv
, skb
);
442 /* get routing information */
443 orig_node
= orig_hash_find(bat_priv
, icmp_packet
->dst
);
447 router
= orig_node_get_router(orig_node
);
451 /* create a copy of the skb, if needed, to modify it. */
452 if (skb_cow(skb
, ETH_HLEN
) < 0)
455 icmp_packet
= (struct icmp_packet_rr
*)skb
->data
;
458 icmp_packet
->header
.ttl
--;
461 send_skb_packet(skb
, router
->if_incoming
, router
->addr
);
462 ret
= NET_RX_SUCCESS
;
466 neigh_node_free_ref(router
);
468 orig_node_free_ref(orig_node
);
472 /* In the bonding case, send the packets in a round
473 * robin fashion over the remaining interfaces.
475 * This method rotates the bonding list and increases the
476 * returned router's refcount. */
477 static struct neigh_node
*find_bond_router(struct orig_node
*primary_orig
,
478 const struct hard_iface
*recv_if
)
480 struct neigh_node
*tmp_neigh_node
;
481 struct neigh_node
*router
= NULL
, *first_candidate
= NULL
;
484 list_for_each_entry_rcu(tmp_neigh_node
, &primary_orig
->bond_list
,
486 if (!first_candidate
)
487 first_candidate
= tmp_neigh_node
;
489 /* recv_if == NULL on the first node. */
490 if (tmp_neigh_node
->if_incoming
== recv_if
)
493 if (!atomic_inc_not_zero(&tmp_neigh_node
->refcount
))
496 router
= tmp_neigh_node
;
500 /* use the first candidate if nothing was found. */
501 if (!router
&& first_candidate
&&
502 atomic_inc_not_zero(&first_candidate
->refcount
))
503 router
= first_candidate
;
508 /* selected should point to the next element
509 * after the current router */
510 spin_lock_bh(&primary_orig
->neigh_list_lock
);
511 /* this is a list_move(), which unfortunately
512 * does not exist as rcu version */
513 list_del_rcu(&primary_orig
->bond_list
);
514 list_add_rcu(&primary_orig
->bond_list
,
515 &router
->bonding_list
);
516 spin_unlock_bh(&primary_orig
->neigh_list_lock
);
523 /* Interface Alternating: Use the best of the
524 * remaining candidates which are not using
527 * Increases the returned router's refcount */
528 static struct neigh_node
*find_ifalter_router(struct orig_node
*primary_orig
,
529 const struct hard_iface
*recv_if
)
531 struct neigh_node
*tmp_neigh_node
;
532 struct neigh_node
*router
= NULL
, *first_candidate
= NULL
;
535 list_for_each_entry_rcu(tmp_neigh_node
, &primary_orig
->bond_list
,
537 if (!first_candidate
)
538 first_candidate
= tmp_neigh_node
;
540 /* recv_if == NULL on the first node. */
541 if (tmp_neigh_node
->if_incoming
== recv_if
)
544 if (!atomic_inc_not_zero(&tmp_neigh_node
->refcount
))
547 /* if we don't have a router yet
548 * or this one is better, choose it. */
550 (tmp_neigh_node
->tq_avg
> router
->tq_avg
)) {
551 /* decrement refcount of
552 * previously selected router */
554 neigh_node_free_ref(router
);
556 router
= tmp_neigh_node
;
557 atomic_inc_not_zero(&router
->refcount
);
560 neigh_node_free_ref(tmp_neigh_node
);
563 /* use the first candidate if nothing was found. */
564 if (!router
&& first_candidate
&&
565 atomic_inc_not_zero(&first_candidate
->refcount
))
566 router
= first_candidate
;
572 int recv_tt_query(struct sk_buff
*skb
, struct hard_iface
*recv_if
)
574 struct bat_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
575 struct tt_query_packet
*tt_query
;
577 struct ethhdr
*ethhdr
;
579 /* drop packet if it has not necessary minimum size */
580 if (unlikely(!pskb_may_pull(skb
, sizeof(struct tt_query_packet
))))
583 /* I could need to modify it */
584 if (skb_cow(skb
, sizeof(struct tt_query_packet
)) < 0)
587 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
589 /* packet with unicast indication but broadcast recipient */
590 if (is_broadcast_ether_addr(ethhdr
->h_dest
))
593 /* packet with broadcast sender address */
594 if (is_broadcast_ether_addr(ethhdr
->h_source
))
597 tt_query
= (struct tt_query_packet
*)skb
->data
;
599 switch (tt_query
->flags
& TT_QUERY_TYPE_MASK
) {
601 batadv_inc_counter(bat_priv
, BAT_CNT_TT_REQUEST_RX
);
603 /* If we cannot provide an answer the tt_request is
605 if (!send_tt_response(bat_priv
, tt_query
)) {
606 bat_dbg(DBG_TT
, bat_priv
,
607 "Routing TT_REQUEST to %pM [%c]\n",
609 (tt_query
->flags
& TT_FULL_TABLE
? 'F' : '.'));
610 return route_unicast_packet(skb
, recv_if
);
614 batadv_inc_counter(bat_priv
, BAT_CNT_TT_RESPONSE_RX
);
616 if (is_my_mac(tt_query
->dst
)) {
617 /* packet needs to be linearized to access the TT
619 if (skb_linearize(skb
) < 0)
621 /* skb_linearize() possibly changed skb->data */
622 tt_query
= (struct tt_query_packet
*)skb
->data
;
624 tt_size
= tt_len(ntohs(tt_query
->tt_data
));
626 /* Ensure we have all the claimed data */
627 if (unlikely(skb_headlen(skb
) <
628 sizeof(struct tt_query_packet
) + tt_size
))
631 handle_tt_response(bat_priv
, tt_query
);
633 bat_dbg(DBG_TT
, bat_priv
,
634 "Routing TT_RESPONSE to %pM [%c]\n",
636 (tt_query
->flags
& TT_FULL_TABLE
? 'F' : '.'));
637 return route_unicast_packet(skb
, recv_if
);
643 /* returning NET_RX_DROP will make the caller function kfree the skb */
647 int recv_roam_adv(struct sk_buff
*skb
, struct hard_iface
*recv_if
)
649 struct bat_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
650 struct roam_adv_packet
*roam_adv_packet
;
651 struct orig_node
*orig_node
;
652 struct ethhdr
*ethhdr
;
654 /* drop packet if it has not necessary minimum size */
655 if (unlikely(!pskb_may_pull(skb
, sizeof(struct roam_adv_packet
))))
658 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
660 /* packet with unicast indication but broadcast recipient */
661 if (is_broadcast_ether_addr(ethhdr
->h_dest
))
664 /* packet with broadcast sender address */
665 if (is_broadcast_ether_addr(ethhdr
->h_source
))
668 batadv_inc_counter(bat_priv
, BAT_CNT_TT_ROAM_ADV_RX
);
670 roam_adv_packet
= (struct roam_adv_packet
*)skb
->data
;
672 if (!is_my_mac(roam_adv_packet
->dst
))
673 return route_unicast_packet(skb
, recv_if
);
675 /* check if it is a backbone gateway. we don't accept
676 * roaming advertisement from it, as it has the same
677 * entries as we have.
679 if (bla_is_backbone_gw_orig(bat_priv
, roam_adv_packet
->src
))
682 orig_node
= orig_hash_find(bat_priv
, roam_adv_packet
->src
);
686 bat_dbg(DBG_TT
, bat_priv
,
687 "Received ROAMING_ADV from %pM (client %pM)\n",
688 roam_adv_packet
->src
, roam_adv_packet
->client
);
690 tt_global_add(bat_priv
, orig_node
, roam_adv_packet
->client
,
691 atomic_read(&orig_node
->last_ttvn
) + 1, true, false);
693 /* Roaming phase starts: I have new information but the ttvn has not
694 * been incremented yet. This flag will make me check all the incoming
695 * packets for the correct destination. */
696 bat_priv
->tt_poss_change
= true;
698 orig_node_free_ref(orig_node
);
700 /* returning NET_RX_DROP will make the caller function kfree the skb */
704 /* find a suitable router for this originator, and use
705 * bonding if possible. increases the found neighbors
707 struct neigh_node
*find_router(struct bat_priv
*bat_priv
,
708 struct orig_node
*orig_node
,
709 const struct hard_iface
*recv_if
)
711 struct orig_node
*primary_orig_node
;
712 struct orig_node
*router_orig
;
713 struct neigh_node
*router
;
714 static uint8_t zero_mac
[ETH_ALEN
] = {0, 0, 0, 0, 0, 0};
720 router
= orig_node_get_router(orig_node
);
724 /* without bonding, the first node should
725 * always choose the default router. */
726 bonding_enabled
= atomic_read(&bat_priv
->bonding
);
729 /* select default router to output */
730 router_orig
= router
->orig_node
;
734 if ((!recv_if
) && (!bonding_enabled
))
737 /* if we have something in the primary_addr, we can search
738 * for a potential bonding candidate. */
739 if (compare_eth(router_orig
->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 (compare_eth(router_orig
->primary_addr
, router_orig
->orig
)) {
746 primary_orig_node
= router_orig
;
748 primary_orig_node
= orig_hash_find(bat_priv
,
749 router_orig
->primary_addr
);
750 if (!primary_orig_node
)
753 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. */
758 if (atomic_read(&primary_orig_node
->bond_candidates
) < 2)
761 /* all nodes between should choose a candidate which
762 * is is not on the interface where the packet came
765 neigh_node_free_ref(router
);
768 router
= find_bond_router(primary_orig_node
, recv_if
);
770 router
= find_ifalter_router(primary_orig_node
, recv_if
);
773 if (router
&& router
->if_incoming
->if_status
!= IF_ACTIVE
)
782 neigh_node_free_ref(router
);
786 static int check_unicast_packet(struct sk_buff
*skb
, int hdr_size
)
788 struct ethhdr
*ethhdr
;
790 /* drop packet if it has not necessary minimum size */
791 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
794 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
796 /* packet with unicast indication but broadcast recipient */
797 if (is_broadcast_ether_addr(ethhdr
->h_dest
))
800 /* packet with broadcast sender address */
801 if (is_broadcast_ether_addr(ethhdr
->h_source
))
805 if (!is_my_mac(ethhdr
->h_dest
))
811 static int route_unicast_packet(struct sk_buff
*skb
, struct hard_iface
*recv_if
)
813 struct bat_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
814 struct orig_node
*orig_node
= NULL
;
815 struct neigh_node
*neigh_node
= NULL
;
816 struct unicast_packet
*unicast_packet
;
817 struct ethhdr
*ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
818 int ret
= NET_RX_DROP
;
819 struct sk_buff
*new_skb
;
821 unicast_packet
= (struct unicast_packet
*)skb
->data
;
824 if (unicast_packet
->header
.ttl
< 2) {
825 pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n",
826 ethhdr
->h_source
, unicast_packet
->dest
);
830 /* get routing information */
831 orig_node
= orig_hash_find(bat_priv
, unicast_packet
->dest
);
836 /* find_router() increases neigh_nodes refcount if found. */
837 neigh_node
= find_router(bat_priv
, orig_node
, recv_if
);
842 /* create a copy of the skb, if needed, to modify it. */
843 if (skb_cow(skb
, ETH_HLEN
) < 0)
846 unicast_packet
= (struct unicast_packet
*)skb
->data
;
848 if (unicast_packet
->header
.packet_type
== BAT_UNICAST
&&
849 atomic_read(&bat_priv
->fragmentation
) &&
850 skb
->len
> neigh_node
->if_incoming
->net_dev
->mtu
) {
851 ret
= frag_send_skb(skb
, bat_priv
,
852 neigh_node
->if_incoming
, neigh_node
->addr
);
856 if (unicast_packet
->header
.packet_type
== BAT_UNICAST_FRAG
&&
857 frag_can_reassemble(skb
, neigh_node
->if_incoming
->net_dev
->mtu
)) {
859 ret
= frag_reassemble_skb(skb
, bat_priv
, &new_skb
);
861 if (ret
== NET_RX_DROP
)
864 /* packet was buffered for late merge */
866 ret
= NET_RX_SUCCESS
;
871 unicast_packet
= (struct unicast_packet
*)skb
->data
;
875 unicast_packet
->header
.ttl
--;
877 /* Update stats counter */
878 batadv_inc_counter(bat_priv
, BAT_CNT_FORWARD
);
879 batadv_add_counter(bat_priv
, BAT_CNT_FORWARD_BYTES
,
880 skb
->len
+ ETH_HLEN
);
883 send_skb_packet(skb
, neigh_node
->if_incoming
, neigh_node
->addr
);
884 ret
= NET_RX_SUCCESS
;
888 neigh_node_free_ref(neigh_node
);
890 orig_node_free_ref(orig_node
);
894 static int check_unicast_ttvn(struct bat_priv
*bat_priv
,
895 struct sk_buff
*skb
) {
897 struct orig_node
*orig_node
;
898 struct ethhdr
*ethhdr
;
899 struct hard_iface
*primary_if
;
900 struct unicast_packet
*unicast_packet
;
903 /* I could need to modify it */
904 if (skb_cow(skb
, sizeof(struct unicast_packet
)) < 0)
907 unicast_packet
= (struct unicast_packet
*)skb
->data
;
909 if (is_my_mac(unicast_packet
->dest
)) {
910 tt_poss_change
= bat_priv
->tt_poss_change
;
911 curr_ttvn
= (uint8_t)atomic_read(&bat_priv
->ttvn
);
913 orig_node
= orig_hash_find(bat_priv
, unicast_packet
->dest
);
918 curr_ttvn
= (uint8_t)atomic_read(&orig_node
->last_ttvn
);
919 tt_poss_change
= orig_node
->tt_poss_change
;
920 orig_node_free_ref(orig_node
);
923 /* Check whether I have to reroute the packet */
924 if (seq_before(unicast_packet
->ttvn
, curr_ttvn
) || tt_poss_change
) {
925 /* check if there is enough data before accessing it */
926 if (pskb_may_pull(skb
, sizeof(struct unicast_packet
) +
930 ethhdr
= (struct ethhdr
*)(skb
->data
+
931 sizeof(struct unicast_packet
));
933 /* we don't have an updated route for this client, so we should
934 * not try to reroute the packet!!
936 if (tt_global_client_is_roaming(bat_priv
, ethhdr
->h_dest
))
939 orig_node
= transtable_search(bat_priv
, NULL
, ethhdr
->h_dest
);
942 if (!is_my_client(bat_priv
, ethhdr
->h_dest
))
944 primary_if
= primary_if_get_selected(bat_priv
);
947 memcpy(unicast_packet
->dest
,
948 primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
949 hardif_free_ref(primary_if
);
951 memcpy(unicast_packet
->dest
, orig_node
->orig
,
953 curr_ttvn
= (uint8_t)
954 atomic_read(&orig_node
->last_ttvn
);
955 orig_node_free_ref(orig_node
);
958 bat_dbg(DBG_ROUTES
, bat_priv
,
959 "TTVN mismatch (old_ttvn %u new_ttvn %u)! Rerouting unicast packet (for %pM) to %pM\n",
960 unicast_packet
->ttvn
, curr_ttvn
, ethhdr
->h_dest
,
961 unicast_packet
->dest
);
963 unicast_packet
->ttvn
= curr_ttvn
;
968 int recv_unicast_packet(struct sk_buff
*skb
, struct hard_iface
*recv_if
)
970 struct bat_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
971 struct unicast_packet
*unicast_packet
;
972 int hdr_size
= sizeof(*unicast_packet
);
974 if (check_unicast_packet(skb
, hdr_size
) < 0)
977 if (!check_unicast_ttvn(bat_priv
, skb
))
980 unicast_packet
= (struct unicast_packet
*)skb
->data
;
983 if (is_my_mac(unicast_packet
->dest
)) {
984 interface_rx(recv_if
->soft_iface
, skb
, recv_if
, hdr_size
);
985 return NET_RX_SUCCESS
;
988 return route_unicast_packet(skb
, recv_if
);
991 int recv_ucast_frag_packet(struct sk_buff
*skb
, struct hard_iface
*recv_if
)
993 struct bat_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
994 struct unicast_frag_packet
*unicast_packet
;
995 int hdr_size
= sizeof(*unicast_packet
);
996 struct sk_buff
*new_skb
= NULL
;
999 if (check_unicast_packet(skb
, hdr_size
) < 0)
1002 if (!check_unicast_ttvn(bat_priv
, skb
))
1005 unicast_packet
= (struct unicast_frag_packet
*)skb
->data
;
1008 if (is_my_mac(unicast_packet
->dest
)) {
1010 ret
= frag_reassemble_skb(skb
, bat_priv
, &new_skb
);
1012 if (ret
== NET_RX_DROP
)
1015 /* packet was buffered for late merge */
1017 return NET_RX_SUCCESS
;
1019 interface_rx(recv_if
->soft_iface
, new_skb
, recv_if
,
1020 sizeof(struct unicast_packet
));
1021 return NET_RX_SUCCESS
;
1024 return route_unicast_packet(skb
, recv_if
);
1028 int recv_bcast_packet(struct sk_buff
*skb
, struct hard_iface
*recv_if
)
1030 struct bat_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1031 struct orig_node
*orig_node
= NULL
;
1032 struct bcast_packet
*bcast_packet
;
1033 struct ethhdr
*ethhdr
;
1034 int hdr_size
= sizeof(*bcast_packet
);
1035 int ret
= NET_RX_DROP
;
1038 /* drop packet if it has not necessary minimum size */
1039 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
1042 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
1044 /* packet with broadcast indication but unicast recipient */
1045 if (!is_broadcast_ether_addr(ethhdr
->h_dest
))
1048 /* packet with broadcast sender address */
1049 if (is_broadcast_ether_addr(ethhdr
->h_source
))
1052 /* ignore broadcasts sent by myself */
1053 if (is_my_mac(ethhdr
->h_source
))
1056 bcast_packet
= (struct bcast_packet
*)skb
->data
;
1058 /* ignore broadcasts originated by myself */
1059 if (is_my_mac(bcast_packet
->orig
))
1062 if (bcast_packet
->header
.ttl
< 2)
1065 orig_node
= orig_hash_find(bat_priv
, bcast_packet
->orig
);
1070 spin_lock_bh(&orig_node
->bcast_seqno_lock
);
1072 /* check whether the packet is a duplicate */
1073 if (bat_test_bit(orig_node
->bcast_bits
, orig_node
->last_bcast_seqno
,
1074 ntohl(bcast_packet
->seqno
)))
1077 seq_diff
= ntohl(bcast_packet
->seqno
) - orig_node
->last_bcast_seqno
;
1079 /* check whether the packet is old and the host just restarted. */
1080 if (window_protected(bat_priv
, seq_diff
,
1081 &orig_node
->bcast_seqno_reset
))
1084 /* mark broadcast in flood history, update window position
1086 if (bit_get_packet(bat_priv
, orig_node
->bcast_bits
, seq_diff
, 1))
1087 orig_node
->last_bcast_seqno
= ntohl(bcast_packet
->seqno
);
1089 spin_unlock_bh(&orig_node
->bcast_seqno_lock
);
1091 /* check whether this has been sent by another originator before */
1092 if (bla_check_bcast_duplist(bat_priv
, bcast_packet
, hdr_size
))
1095 /* rebroadcast packet */
1096 add_bcast_packet_to_list(bat_priv
, skb
, 1);
1098 /* don't hand the broadcast up if it is from an originator
1099 * from the same backbone.
1101 if (bla_is_backbone_gw(skb
, orig_node
, hdr_size
))
1104 /* broadcast for me */
1105 interface_rx(recv_if
->soft_iface
, skb
, recv_if
, hdr_size
);
1106 ret
= NET_RX_SUCCESS
;
1110 spin_unlock_bh(&orig_node
->bcast_seqno_lock
);
1113 orig_node_free_ref(orig_node
);
1117 int recv_vis_packet(struct sk_buff
*skb
, struct hard_iface
*recv_if
)
1119 struct vis_packet
*vis_packet
;
1120 struct ethhdr
*ethhdr
;
1121 struct bat_priv
*bat_priv
= netdev_priv(recv_if
->soft_iface
);
1122 int hdr_size
= sizeof(*vis_packet
);
1124 /* keep skb linear */
1125 if (skb_linearize(skb
) < 0)
1128 if (unlikely(!pskb_may_pull(skb
, hdr_size
)))
1131 vis_packet
= (struct vis_packet
*)skb
->data
;
1132 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
1135 if (!is_my_mac(ethhdr
->h_dest
))
1138 /* ignore own packets */
1139 if (is_my_mac(vis_packet
->vis_orig
))
1142 if (is_my_mac(vis_packet
->sender_orig
))
1145 switch (vis_packet
->vis_type
) {
1146 case VIS_TYPE_SERVER_SYNC
:
1147 receive_server_sync_packet(bat_priv
, vis_packet
,
1151 case VIS_TYPE_CLIENT_UPDATE
:
1152 receive_client_update_packet(bat_priv
, vis_packet
,
1156 default: /* ignore unknown packet */
1160 /* We take a copy of the data in the packet, so we should
1161 always free the skbuf. */
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