1 /* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors:
3 * Marek Lindner, Simon Wunderlich
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of version 2 of the GNU General Public
7 * License as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 #include <linux/crc32c.h>
19 #include <linux/highmem.h>
20 #include <linux/if_vlan.h>
23 #include <net/dsfield.h>
29 #include "originator.h"
30 #include "soft-interface.h"
31 #include "icmp_socket.h"
32 #include "translation-table.h"
33 #include "hard-interface.h"
34 #include "gateway_client.h"
35 #include "bridge_loop_avoidance.h"
36 #include "distributed-arp-table.h"
37 #include "gateway_common.h"
40 #include "network-coding.h"
41 #include "fragmentation.h"
44 /* List manipulations on hardif_list have to be rtnl_lock()'ed,
45 * list traversals just rcu-locked
47 struct list_head batadv_hardif_list
;
48 static int (*batadv_rx_handler
[256])(struct sk_buff
*,
49 struct batadv_hard_iface
*);
50 char batadv_routing_algo
[20] = "BATMAN_IV";
51 static struct hlist_head batadv_algo_list
;
53 unsigned char batadv_broadcast_addr
[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
55 struct workqueue_struct
*batadv_event_workqueue
;
57 static void batadv_recv_handler_init(void);
59 static int __init
batadv_init(void)
61 INIT_LIST_HEAD(&batadv_hardif_list
);
62 INIT_HLIST_HEAD(&batadv_algo_list
);
64 batadv_recv_handler_init();
69 batadv_event_workqueue
= create_singlethread_workqueue("bat_events");
71 if (!batadv_event_workqueue
)
75 batadv_debugfs_init();
77 register_netdevice_notifier(&batadv_hard_if_notifier
);
78 rtnl_link_register(&batadv_link_ops
);
80 pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n",
81 BATADV_SOURCE_VERSION
, BATADV_COMPAT_VERSION
);
86 static void __exit
batadv_exit(void)
88 batadv_debugfs_destroy();
89 rtnl_link_unregister(&batadv_link_ops
);
90 unregister_netdevice_notifier(&batadv_hard_if_notifier
);
91 batadv_hardif_remove_interfaces();
93 flush_workqueue(batadv_event_workqueue
);
94 destroy_workqueue(batadv_event_workqueue
);
95 batadv_event_workqueue
= NULL
;
100 int batadv_mesh_init(struct net_device
*soft_iface
)
102 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
105 spin_lock_init(&bat_priv
->forw_bat_list_lock
);
106 spin_lock_init(&bat_priv
->forw_bcast_list_lock
);
107 spin_lock_init(&bat_priv
->tt
.changes_list_lock
);
108 spin_lock_init(&bat_priv
->tt
.req_list_lock
);
109 spin_lock_init(&bat_priv
->tt
.roam_list_lock
);
110 spin_lock_init(&bat_priv
->tt
.last_changeset_lock
);
111 spin_lock_init(&bat_priv
->tt
.commit_lock
);
112 spin_lock_init(&bat_priv
->gw
.list_lock
);
113 spin_lock_init(&bat_priv
->tvlv
.container_list_lock
);
114 spin_lock_init(&bat_priv
->tvlv
.handler_list_lock
);
115 spin_lock_init(&bat_priv
->softif_vlan_list_lock
);
117 INIT_HLIST_HEAD(&bat_priv
->forw_bat_list
);
118 INIT_HLIST_HEAD(&bat_priv
->forw_bcast_list
);
119 INIT_HLIST_HEAD(&bat_priv
->gw
.list
);
120 INIT_LIST_HEAD(&bat_priv
->tt
.changes_list
);
121 INIT_LIST_HEAD(&bat_priv
->tt
.req_list
);
122 INIT_LIST_HEAD(&bat_priv
->tt
.roam_list
);
123 INIT_HLIST_HEAD(&bat_priv
->tvlv
.container_list
);
124 INIT_HLIST_HEAD(&bat_priv
->tvlv
.handler_list
);
125 INIT_HLIST_HEAD(&bat_priv
->softif_vlan_list
);
127 ret
= batadv_originator_init(bat_priv
);
131 ret
= batadv_tt_init(bat_priv
);
135 ret
= batadv_bla_init(bat_priv
);
139 ret
= batadv_dat_init(bat_priv
);
143 ret
= batadv_nc_mesh_init(bat_priv
);
147 batadv_gw_init(bat_priv
);
149 atomic_set(&bat_priv
->gw
.reselect
, 0);
150 atomic_set(&bat_priv
->mesh_state
, BATADV_MESH_ACTIVE
);
155 batadv_mesh_free(soft_iface
);
159 void batadv_mesh_free(struct net_device
*soft_iface
)
161 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
163 atomic_set(&bat_priv
->mesh_state
, BATADV_MESH_DEACTIVATING
);
165 batadv_purge_outstanding_packets(bat_priv
, NULL
);
167 batadv_gw_node_purge(bat_priv
);
168 batadv_nc_mesh_free(bat_priv
);
169 batadv_dat_free(bat_priv
);
170 batadv_bla_free(bat_priv
);
172 /* Free the TT and the originator tables only after having terminated
173 * all the other depending components which may use these structures for
176 batadv_tt_free(bat_priv
);
178 /* Since the originator table clean up routine is accessing the TT
179 * tables as well, it has to be invoked after the TT tables have been
180 * freed and marked as empty. This ensures that no cleanup RCU callbacks
181 * accessing the TT data are scheduled for later execution.
183 batadv_originator_free(bat_priv
);
185 batadv_gw_free(bat_priv
);
187 free_percpu(bat_priv
->bat_counters
);
188 bat_priv
->bat_counters
= NULL
;
190 atomic_set(&bat_priv
->mesh_state
, BATADV_MESH_INACTIVE
);
194 * batadv_is_my_mac - check if the given mac address belongs to any of the real
195 * interfaces in the current mesh
196 * @bat_priv: the bat priv with all the soft interface information
197 * @addr: the address to check
199 int batadv_is_my_mac(struct batadv_priv
*bat_priv
, const uint8_t *addr
)
201 const struct batadv_hard_iface
*hard_iface
;
204 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
205 if (hard_iface
->if_status
!= BATADV_IF_ACTIVE
)
208 if (hard_iface
->soft_iface
!= bat_priv
->soft_iface
)
211 if (batadv_compare_eth(hard_iface
->net_dev
->dev_addr
, addr
)) {
221 * batadv_seq_print_text_primary_if_get - called from debugfs table printing
222 * function that requires the primary interface
223 * @seq: debugfs table seq_file struct
225 * Returns primary interface if found or NULL otherwise.
227 struct batadv_hard_iface
*
228 batadv_seq_print_text_primary_if_get(struct seq_file
*seq
)
230 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
231 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
232 struct batadv_hard_iface
*primary_if
;
234 primary_if
= batadv_primary_if_get_selected(bat_priv
);
238 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
243 if (primary_if
->if_status
== BATADV_IF_ACTIVE
)
247 "BATMAN mesh %s disabled - primary interface not active\n",
249 batadv_hardif_free_ref(primary_if
);
257 * batadv_max_header_len - calculate maximum encapsulation overhead for a
260 * Return the maximum encapsulation overhead in bytes.
262 int batadv_max_header_len(void)
266 header_len
= max_t(int, header_len
,
267 sizeof(struct batadv_unicast_packet
));
268 header_len
= max_t(int, header_len
,
269 sizeof(struct batadv_unicast_4addr_packet
));
270 header_len
= max_t(int, header_len
,
271 sizeof(struct batadv_bcast_packet
));
273 #ifdef CONFIG_BATMAN_ADV_NC
274 header_len
= max_t(int, header_len
,
275 sizeof(struct batadv_coded_packet
));
282 * batadv_skb_set_priority - sets skb priority according to packet content
283 * @skb: the packet to be sent
284 * @offset: offset to the packet content
286 * This function sets a value between 256 and 263 (802.1d priority), which
287 * can be interpreted by the cfg80211 or other drivers.
289 void batadv_skb_set_priority(struct sk_buff
*skb
, int offset
)
291 struct iphdr ip_hdr_tmp
, *ip_hdr
;
292 struct ipv6hdr ip6_hdr_tmp
, *ip6_hdr
;
293 struct ethhdr ethhdr_tmp
, *ethhdr
;
294 struct vlan_ethhdr
*vhdr
, vhdr_tmp
;
297 /* already set, do nothing */
298 if (skb
->priority
>= 256 && skb
->priority
<= 263)
301 ethhdr
= skb_header_pointer(skb
, offset
, sizeof(*ethhdr
), ðhdr_tmp
);
305 switch (ethhdr
->h_proto
) {
306 case htons(ETH_P_8021Q
):
307 vhdr
= skb_header_pointer(skb
, offset
+ sizeof(*vhdr
),
308 sizeof(*vhdr
), &vhdr_tmp
);
311 prio
= ntohs(vhdr
->h_vlan_TCI
) & VLAN_PRIO_MASK
;
312 prio
= prio
>> VLAN_PRIO_SHIFT
;
314 case htons(ETH_P_IP
):
315 ip_hdr
= skb_header_pointer(skb
, offset
+ sizeof(*ethhdr
),
316 sizeof(*ip_hdr
), &ip_hdr_tmp
);
319 prio
= (ipv4_get_dsfield(ip_hdr
) & 0xfc) >> 5;
321 case htons(ETH_P_IPV6
):
322 ip6_hdr
= skb_header_pointer(skb
, offset
+ sizeof(*ethhdr
),
323 sizeof(*ip6_hdr
), &ip6_hdr_tmp
);
326 prio
= (ipv6_get_dsfield(ip6_hdr
) & 0xfc) >> 5;
332 skb
->priority
= prio
+ 256;
335 static int batadv_recv_unhandled_packet(struct sk_buff
*skb
,
336 struct batadv_hard_iface
*recv_if
)
341 /* incoming packets with the batman ethertype received on any active hard
344 int batadv_batman_skb_recv(struct sk_buff
*skb
, struct net_device
*dev
,
345 struct packet_type
*ptype
,
346 struct net_device
*orig_dev
)
348 struct batadv_priv
*bat_priv
;
349 struct batadv_ogm_packet
*batadv_ogm_packet
;
350 struct batadv_hard_iface
*hard_iface
;
354 hard_iface
= container_of(ptype
, struct batadv_hard_iface
,
356 skb
= skb_share_check(skb
, GFP_ATOMIC
);
358 /* skb was released by skb_share_check() */
362 /* packet should hold at least type and version */
363 if (unlikely(!pskb_may_pull(skb
, 2)))
366 /* expect a valid ethernet header here. */
367 if (unlikely(skb
->mac_len
!= ETH_HLEN
|| !skb_mac_header(skb
)))
370 if (!hard_iface
->soft_iface
)
373 bat_priv
= netdev_priv(hard_iface
->soft_iface
);
375 if (atomic_read(&bat_priv
->mesh_state
) != BATADV_MESH_ACTIVE
)
378 /* discard frames on not active interfaces */
379 if (hard_iface
->if_status
!= BATADV_IF_ACTIVE
)
382 batadv_ogm_packet
= (struct batadv_ogm_packet
*)skb
->data
;
384 if (batadv_ogm_packet
->version
!= BATADV_COMPAT_VERSION
) {
385 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
386 "Drop packet: incompatible batman version (%i)\n",
387 batadv_ogm_packet
->version
);
391 /* all receive handlers return whether they received or reused
392 * the supplied skb. if not, we have to free the skb.
394 idx
= batadv_ogm_packet
->packet_type
;
395 ret
= (*batadv_rx_handler
[idx
])(skb
, hard_iface
);
397 if (ret
== NET_RX_DROP
)
400 /* return NET_RX_SUCCESS in any case as we
401 * most probably dropped the packet for
402 * routing-logical reasons.
404 return NET_RX_SUCCESS
;
412 static void batadv_recv_handler_init(void)
416 for (i
= 0; i
< ARRAY_SIZE(batadv_rx_handler
); i
++)
417 batadv_rx_handler
[i
] = batadv_recv_unhandled_packet
;
419 for (i
= BATADV_UNICAST_MIN
; i
<= BATADV_UNICAST_MAX
; i
++)
420 batadv_rx_handler
[i
] = batadv_recv_unhandled_unicast_packet
;
422 /* compile time checks for struct member offsets */
423 BUILD_BUG_ON(offsetof(struct batadv_unicast_4addr_packet
, src
) != 10);
424 BUILD_BUG_ON(offsetof(struct batadv_unicast_packet
, dest
) != 4);
425 BUILD_BUG_ON(offsetof(struct batadv_unicast_tvlv_packet
, dst
) != 4);
426 BUILD_BUG_ON(offsetof(struct batadv_frag_packet
, dest
) != 4);
427 BUILD_BUG_ON(offsetof(struct batadv_icmp_packet
, dst
) != 4);
428 BUILD_BUG_ON(offsetof(struct batadv_icmp_packet_rr
, dst
) != 4);
430 /* broadcast packet */
431 batadv_rx_handler
[BATADV_BCAST
] = batadv_recv_bcast_packet
;
433 /* unicast packets ... */
434 /* unicast with 4 addresses packet */
435 batadv_rx_handler
[BATADV_UNICAST_4ADDR
] = batadv_recv_unicast_packet
;
437 batadv_rx_handler
[BATADV_UNICAST
] = batadv_recv_unicast_packet
;
438 /* unicast tvlv packet */
439 batadv_rx_handler
[BATADV_UNICAST_TVLV
] = batadv_recv_unicast_tvlv
;
440 /* batman icmp packet */
441 batadv_rx_handler
[BATADV_ICMP
] = batadv_recv_icmp_packet
;
442 /* Fragmented packets */
443 batadv_rx_handler
[BATADV_UNICAST_FRAG
] = batadv_recv_frag_packet
;
447 batadv_recv_handler_register(uint8_t packet_type
,
448 int (*recv_handler
)(struct sk_buff
*,
449 struct batadv_hard_iface
*))
451 int (*curr
)(struct sk_buff
*,
452 struct batadv_hard_iface
*);
453 curr
= batadv_rx_handler
[packet_type
];
455 if ((curr
!= batadv_recv_unhandled_packet
) &&
456 (curr
!= batadv_recv_unhandled_unicast_packet
))
459 batadv_rx_handler
[packet_type
] = recv_handler
;
463 void batadv_recv_handler_unregister(uint8_t packet_type
)
465 batadv_rx_handler
[packet_type
] = batadv_recv_unhandled_packet
;
468 static struct batadv_algo_ops
*batadv_algo_get(char *name
)
470 struct batadv_algo_ops
*bat_algo_ops
= NULL
, *bat_algo_ops_tmp
;
472 hlist_for_each_entry(bat_algo_ops_tmp
, &batadv_algo_list
, list
) {
473 if (strcmp(bat_algo_ops_tmp
->name
, name
) != 0)
476 bat_algo_ops
= bat_algo_ops_tmp
;
483 int batadv_algo_register(struct batadv_algo_ops
*bat_algo_ops
)
485 struct batadv_algo_ops
*bat_algo_ops_tmp
;
488 bat_algo_ops_tmp
= batadv_algo_get(bat_algo_ops
->name
);
489 if (bat_algo_ops_tmp
) {
490 pr_info("Trying to register already registered routing algorithm: %s\n",
496 /* all algorithms must implement all ops (for now) */
497 if (!bat_algo_ops
->bat_iface_enable
||
498 !bat_algo_ops
->bat_iface_disable
||
499 !bat_algo_ops
->bat_iface_update_mac
||
500 !bat_algo_ops
->bat_primary_iface_set
||
501 !bat_algo_ops
->bat_ogm_schedule
||
502 !bat_algo_ops
->bat_ogm_emit
||
503 !bat_algo_ops
->bat_neigh_cmp
||
504 !bat_algo_ops
->bat_neigh_is_equiv_or_better
) {
505 pr_info("Routing algo '%s' does not implement required ops\n",
511 INIT_HLIST_NODE(&bat_algo_ops
->list
);
512 hlist_add_head(&bat_algo_ops
->list
, &batadv_algo_list
);
519 int batadv_algo_select(struct batadv_priv
*bat_priv
, char *name
)
521 struct batadv_algo_ops
*bat_algo_ops
;
524 bat_algo_ops
= batadv_algo_get(name
);
528 bat_priv
->bat_algo_ops
= bat_algo_ops
;
535 int batadv_algo_seq_print_text(struct seq_file
*seq
, void *offset
)
537 struct batadv_algo_ops
*bat_algo_ops
;
539 seq_puts(seq
, "Available routing algorithms:\n");
541 hlist_for_each_entry(bat_algo_ops
, &batadv_algo_list
, list
) {
542 seq_printf(seq
, "%s\n", bat_algo_ops
->name
);
549 * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in
551 * @skb: skb pointing to fragmented socket buffers
552 * @payload_ptr: Pointer to position inside the head buffer of the skb
553 * marking the start of the data to be CRC'ed
555 * payload_ptr must always point to an address in the skb head buffer and not to
558 __be32
batadv_skb_crc32(struct sk_buff
*skb
, u8
*payload_ptr
)
562 unsigned int to
= skb
->len
;
563 struct skb_seq_state st
;
566 unsigned int consumed
= 0;
568 from
= (unsigned int)(payload_ptr
- skb
->data
);
570 skb_prepare_seq_read(skb
, from
, to
, &st
);
571 while ((len
= skb_seq_read(consumed
, &data
, &st
)) != 0) {
572 crc
= crc32c(crc
, data
, len
);
580 * batadv_tvlv_handler_free_ref - decrement the tvlv handler refcounter and
582 * @tvlv_handler: the tvlv handler to free
585 batadv_tvlv_handler_free_ref(struct batadv_tvlv_handler
*tvlv_handler
)
587 if (atomic_dec_and_test(&tvlv_handler
->refcount
))
588 kfree_rcu(tvlv_handler
, rcu
);
592 * batadv_tvlv_handler_get - retrieve tvlv handler from the tvlv handler list
593 * based on the provided type and version (both need to match)
594 * @bat_priv: the bat priv with all the soft interface information
595 * @type: tvlv handler type to look for
596 * @version: tvlv handler version to look for
598 * Returns tvlv handler if found or NULL otherwise.
600 static struct batadv_tvlv_handler
601 *batadv_tvlv_handler_get(struct batadv_priv
*bat_priv
,
602 uint8_t type
, uint8_t version
)
604 struct batadv_tvlv_handler
*tvlv_handler_tmp
, *tvlv_handler
= NULL
;
607 hlist_for_each_entry_rcu(tvlv_handler_tmp
,
608 &bat_priv
->tvlv
.handler_list
, list
) {
609 if (tvlv_handler_tmp
->type
!= type
)
612 if (tvlv_handler_tmp
->version
!= version
)
615 if (!atomic_inc_not_zero(&tvlv_handler_tmp
->refcount
))
618 tvlv_handler
= tvlv_handler_tmp
;
627 * batadv_tvlv_container_free_ref - decrement the tvlv container refcounter and
629 * @tvlv_handler: the tvlv container to free
631 static void batadv_tvlv_container_free_ref(struct batadv_tvlv_container
*tvlv
)
633 if (atomic_dec_and_test(&tvlv
->refcount
))
638 * batadv_tvlv_container_get - retrieve tvlv container from the tvlv container
639 * list based on the provided type and version (both need to match)
640 * @bat_priv: the bat priv with all the soft interface information
641 * @type: tvlv container type to look for
642 * @version: tvlv container version to look for
644 * Has to be called with the appropriate locks being acquired
645 * (tvlv.container_list_lock).
647 * Returns tvlv container if found or NULL otherwise.
649 static struct batadv_tvlv_container
650 *batadv_tvlv_container_get(struct batadv_priv
*bat_priv
,
651 uint8_t type
, uint8_t version
)
653 struct batadv_tvlv_container
*tvlv_tmp
, *tvlv
= NULL
;
655 hlist_for_each_entry(tvlv_tmp
, &bat_priv
->tvlv
.container_list
, list
) {
656 if (tvlv_tmp
->tvlv_hdr
.type
!= type
)
659 if (tvlv_tmp
->tvlv_hdr
.version
!= version
)
662 if (!atomic_inc_not_zero(&tvlv_tmp
->refcount
))
673 * batadv_tvlv_container_list_size - calculate the size of the tvlv container
675 * @bat_priv: the bat priv with all the soft interface information
677 * Has to be called with the appropriate locks being acquired
678 * (tvlv.container_list_lock).
680 * Returns size of all currently registered tvlv containers in bytes.
682 static uint16_t batadv_tvlv_container_list_size(struct batadv_priv
*bat_priv
)
684 struct batadv_tvlv_container
*tvlv
;
685 uint16_t tvlv_len
= 0;
687 hlist_for_each_entry(tvlv
, &bat_priv
->tvlv
.container_list
, list
) {
688 tvlv_len
+= sizeof(struct batadv_tvlv_hdr
);
689 tvlv_len
+= ntohs(tvlv
->tvlv_hdr
.len
);
696 * batadv_tvlv_container_remove - remove tvlv container from the tvlv container
698 * @tvlv: the to be removed tvlv container
700 * Has to be called with the appropriate locks being acquired
701 * (tvlv.container_list_lock).
703 static void batadv_tvlv_container_remove(struct batadv_tvlv_container
*tvlv
)
708 hlist_del(&tvlv
->list
);
710 /* first call to decrement the counter, second call to free */
711 batadv_tvlv_container_free_ref(tvlv
);
712 batadv_tvlv_container_free_ref(tvlv
);
716 * batadv_tvlv_container_unregister - unregister tvlv container based on the
717 * provided type and version (both need to match)
718 * @bat_priv: the bat priv with all the soft interface information
719 * @type: tvlv container type to unregister
720 * @version: tvlv container type to unregister
722 void batadv_tvlv_container_unregister(struct batadv_priv
*bat_priv
,
723 uint8_t type
, uint8_t version
)
725 struct batadv_tvlv_container
*tvlv
;
727 spin_lock_bh(&bat_priv
->tvlv
.container_list_lock
);
728 tvlv
= batadv_tvlv_container_get(bat_priv
, type
, version
);
729 batadv_tvlv_container_remove(tvlv
);
730 spin_unlock_bh(&bat_priv
->tvlv
.container_list_lock
);
734 * batadv_tvlv_container_register - register tvlv type, version and content
735 * to be propagated with each (primary interface) OGM
736 * @bat_priv: the bat priv with all the soft interface information
737 * @type: tvlv container type
738 * @version: tvlv container version
739 * @tvlv_value: tvlv container content
740 * @tvlv_value_len: tvlv container content length
742 * If a container of the same type and version was already registered the new
743 * content is going to replace the old one.
745 void batadv_tvlv_container_register(struct batadv_priv
*bat_priv
,
746 uint8_t type
, uint8_t version
,
747 void *tvlv_value
, uint16_t tvlv_value_len
)
749 struct batadv_tvlv_container
*tvlv_old
, *tvlv_new
;
754 tvlv_new
= kzalloc(sizeof(*tvlv_new
) + tvlv_value_len
, GFP_ATOMIC
);
758 tvlv_new
->tvlv_hdr
.version
= version
;
759 tvlv_new
->tvlv_hdr
.type
= type
;
760 tvlv_new
->tvlv_hdr
.len
= htons(tvlv_value_len
);
762 memcpy(tvlv_new
+ 1, tvlv_value
, ntohs(tvlv_new
->tvlv_hdr
.len
));
763 INIT_HLIST_NODE(&tvlv_new
->list
);
764 atomic_set(&tvlv_new
->refcount
, 1);
766 spin_lock_bh(&bat_priv
->tvlv
.container_list_lock
);
767 tvlv_old
= batadv_tvlv_container_get(bat_priv
, type
, version
);
768 batadv_tvlv_container_remove(tvlv_old
);
769 hlist_add_head(&tvlv_new
->list
, &bat_priv
->tvlv
.container_list
);
770 spin_unlock_bh(&bat_priv
->tvlv
.container_list_lock
);
774 * batadv_tvlv_realloc_packet_buff - reallocate packet buffer to accomodate
775 * requested packet size
776 * @packet_buff: packet buffer
777 * @packet_buff_len: packet buffer size
778 * @packet_min_len: requested packet minimum size
779 * @additional_packet_len: requested additional packet size on top of minimum
782 * Returns true of the packet buffer could be changed to the requested size,
785 static bool batadv_tvlv_realloc_packet_buff(unsigned char **packet_buff
,
786 int *packet_buff_len
,
788 int additional_packet_len
)
790 unsigned char *new_buff
;
792 new_buff
= kmalloc(min_packet_len
+ additional_packet_len
, GFP_ATOMIC
);
794 /* keep old buffer if kmalloc should fail */
796 memcpy(new_buff
, *packet_buff
, min_packet_len
);
798 *packet_buff
= new_buff
;
799 *packet_buff_len
= min_packet_len
+ additional_packet_len
;
807 * batadv_tvlv_container_ogm_append - append tvlv container content to given
809 * @bat_priv: the bat priv with all the soft interface information
810 * @packet_buff: ogm packet buffer
811 * @packet_buff_len: ogm packet buffer size including ogm header and tvlv
813 * @packet_min_len: ogm header size to be preserved for the OGM itself
815 * The ogm packet might be enlarged or shrunk depending on the current size
816 * and the size of the to-be-appended tvlv containers.
818 * Returns size of all appended tvlv containers in bytes.
820 uint16_t batadv_tvlv_container_ogm_append(struct batadv_priv
*bat_priv
,
821 unsigned char **packet_buff
,
822 int *packet_buff_len
,
825 struct batadv_tvlv_container
*tvlv
;
826 struct batadv_tvlv_hdr
*tvlv_hdr
;
827 uint16_t tvlv_value_len
;
831 spin_lock_bh(&bat_priv
->tvlv
.container_list_lock
);
832 tvlv_value_len
= batadv_tvlv_container_list_size(bat_priv
);
834 ret
= batadv_tvlv_realloc_packet_buff(packet_buff
, packet_buff_len
,
835 packet_min_len
, tvlv_value_len
);
843 tvlv_value
= (*packet_buff
) + packet_min_len
;
845 hlist_for_each_entry(tvlv
, &bat_priv
->tvlv
.container_list
, list
) {
846 tvlv_hdr
= tvlv_value
;
847 tvlv_hdr
->type
= tvlv
->tvlv_hdr
.type
;
848 tvlv_hdr
->version
= tvlv
->tvlv_hdr
.version
;
849 tvlv_hdr
->len
= tvlv
->tvlv_hdr
.len
;
850 tvlv_value
= tvlv_hdr
+ 1;
851 memcpy(tvlv_value
, tvlv
+ 1, ntohs(tvlv
->tvlv_hdr
.len
));
852 tvlv_value
= (uint8_t *)tvlv_value
+ ntohs(tvlv
->tvlv_hdr
.len
);
856 spin_unlock_bh(&bat_priv
->tvlv
.container_list_lock
);
857 return tvlv_value_len
;
861 * batadv_tvlv_call_handler - parse the given tvlv buffer to call the
862 * appropriate handlers
863 * @bat_priv: the bat priv with all the soft interface information
864 * @tvlv_handler: tvlv callback function handling the tvlv content
865 * @ogm_source: flag indicating wether the tvlv is an ogm or a unicast packet
866 * @orig_node: orig node emitting the ogm packet
867 * @src: source mac address of the unicast packet
868 * @dst: destination mac address of the unicast packet
869 * @tvlv_value: tvlv content
870 * @tvlv_value_len: tvlv content length
872 * Returns success if handler was not found or the return value of the handler
875 static int batadv_tvlv_call_handler(struct batadv_priv
*bat_priv
,
876 struct batadv_tvlv_handler
*tvlv_handler
,
878 struct batadv_orig_node
*orig_node
,
879 uint8_t *src
, uint8_t *dst
,
880 void *tvlv_value
, uint16_t tvlv_value_len
)
883 return NET_RX_SUCCESS
;
886 if (!tvlv_handler
->ogm_handler
)
887 return NET_RX_SUCCESS
;
890 return NET_RX_SUCCESS
;
892 tvlv_handler
->ogm_handler(bat_priv
, orig_node
,
894 tvlv_value
, tvlv_value_len
);
895 tvlv_handler
->flags
|= BATADV_TVLV_HANDLER_OGM_CALLED
;
898 return NET_RX_SUCCESS
;
901 return NET_RX_SUCCESS
;
903 if (!tvlv_handler
->unicast_handler
)
904 return NET_RX_SUCCESS
;
906 return tvlv_handler
->unicast_handler(bat_priv
, src
,
911 return NET_RX_SUCCESS
;
915 * batadv_tvlv_containers_process - parse the given tvlv buffer to call the
916 * appropriate handlers
917 * @bat_priv: the bat priv with all the soft interface information
918 * @ogm_source: flag indicating wether the tvlv is an ogm or a unicast packet
919 * @orig_node: orig node emitting the ogm packet
920 * @src: source mac address of the unicast packet
921 * @dst: destination mac address of the unicast packet
922 * @tvlv_value: tvlv content
923 * @tvlv_value_len: tvlv content length
925 * Returns success when processing an OGM or the return value of all called
928 int batadv_tvlv_containers_process(struct batadv_priv
*bat_priv
,
930 struct batadv_orig_node
*orig_node
,
931 uint8_t *src
, uint8_t *dst
,
932 void *tvlv_value
, uint16_t tvlv_value_len
)
934 struct batadv_tvlv_handler
*tvlv_handler
;
935 struct batadv_tvlv_hdr
*tvlv_hdr
;
936 uint16_t tvlv_value_cont_len
;
937 uint8_t cifnotfound
= BATADV_TVLV_HANDLER_OGM_CIFNOTFND
;
938 int ret
= NET_RX_SUCCESS
;
940 while (tvlv_value_len
>= sizeof(*tvlv_hdr
)) {
941 tvlv_hdr
= tvlv_value
;
942 tvlv_value_cont_len
= ntohs(tvlv_hdr
->len
);
943 tvlv_value
= tvlv_hdr
+ 1;
944 tvlv_value_len
-= sizeof(*tvlv_hdr
);
946 if (tvlv_value_cont_len
> tvlv_value_len
)
949 tvlv_handler
= batadv_tvlv_handler_get(bat_priv
,
953 ret
|= batadv_tvlv_call_handler(bat_priv
, tvlv_handler
,
954 ogm_source
, orig_node
,
955 src
, dst
, tvlv_value
,
956 tvlv_value_cont_len
);
958 batadv_tvlv_handler_free_ref(tvlv_handler
);
959 tvlv_value
= (uint8_t *)tvlv_value
+ tvlv_value_cont_len
;
960 tvlv_value_len
-= tvlv_value_cont_len
;
967 hlist_for_each_entry_rcu(tvlv_handler
,
968 &bat_priv
->tvlv
.handler_list
, list
) {
969 if ((tvlv_handler
->flags
& BATADV_TVLV_HANDLER_OGM_CIFNOTFND
) &&
970 !(tvlv_handler
->flags
& BATADV_TVLV_HANDLER_OGM_CALLED
))
971 tvlv_handler
->ogm_handler(bat_priv
, orig_node
,
972 cifnotfound
, NULL
, 0);
974 tvlv_handler
->flags
&= ~BATADV_TVLV_HANDLER_OGM_CALLED
;
978 return NET_RX_SUCCESS
;
982 * batadv_tvlv_ogm_receive - process an incoming ogm and call the appropriate
984 * @bat_priv: the bat priv with all the soft interface information
985 * @batadv_ogm_packet: ogm packet containing the tvlv containers
986 * @orig_node: orig node emitting the ogm packet
988 void batadv_tvlv_ogm_receive(struct batadv_priv
*bat_priv
,
989 struct batadv_ogm_packet
*batadv_ogm_packet
,
990 struct batadv_orig_node
*orig_node
)
993 uint16_t tvlv_value_len
;
995 if (!batadv_ogm_packet
)
998 tvlv_value_len
= ntohs(batadv_ogm_packet
->tvlv_len
);
1002 tvlv_value
= batadv_ogm_packet
+ 1;
1004 batadv_tvlv_containers_process(bat_priv
, true, orig_node
, NULL
, NULL
,
1005 tvlv_value
, tvlv_value_len
);
1009 * batadv_tvlv_handler_register - register tvlv handler based on the provided
1010 * type and version (both need to match) for ogm tvlv payload and/or unicast
1012 * @bat_priv: the bat priv with all the soft interface information
1013 * @optr: ogm tvlv handler callback function. This function receives the orig
1014 * node, flags and the tvlv content as argument to process.
1015 * @uptr: unicast tvlv handler callback function. This function receives the
1016 * source & destination of the unicast packet as well as the tvlv content
1018 * @type: tvlv handler type to be registered
1019 * @version: tvlv handler version to be registered
1020 * @flags: flags to enable or disable TVLV API behavior
1022 void batadv_tvlv_handler_register(struct batadv_priv
*bat_priv
,
1023 void (*optr
)(struct batadv_priv
*bat_priv
,
1024 struct batadv_orig_node
*orig
,
1027 uint16_t tvlv_value_len
),
1028 int (*uptr
)(struct batadv_priv
*bat_priv
,
1029 uint8_t *src
, uint8_t *dst
,
1031 uint16_t tvlv_value_len
),
1032 uint8_t type
, uint8_t version
, uint8_t flags
)
1034 struct batadv_tvlv_handler
*tvlv_handler
;
1036 tvlv_handler
= batadv_tvlv_handler_get(bat_priv
, type
, version
);
1038 batadv_tvlv_handler_free_ref(tvlv_handler
);
1042 tvlv_handler
= kzalloc(sizeof(*tvlv_handler
), GFP_ATOMIC
);
1046 tvlv_handler
->ogm_handler
= optr
;
1047 tvlv_handler
->unicast_handler
= uptr
;
1048 tvlv_handler
->type
= type
;
1049 tvlv_handler
->version
= version
;
1050 tvlv_handler
->flags
= flags
;
1051 atomic_set(&tvlv_handler
->refcount
, 1);
1052 INIT_HLIST_NODE(&tvlv_handler
->list
);
1054 spin_lock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1055 hlist_add_head_rcu(&tvlv_handler
->list
, &bat_priv
->tvlv
.handler_list
);
1056 spin_unlock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1060 * batadv_tvlv_handler_unregister - unregister tvlv handler based on the
1061 * provided type and version (both need to match)
1062 * @bat_priv: the bat priv with all the soft interface information
1063 * @type: tvlv handler type to be unregistered
1064 * @version: tvlv handler version to be unregistered
1066 void batadv_tvlv_handler_unregister(struct batadv_priv
*bat_priv
,
1067 uint8_t type
, uint8_t version
)
1069 struct batadv_tvlv_handler
*tvlv_handler
;
1071 tvlv_handler
= batadv_tvlv_handler_get(bat_priv
, type
, version
);
1075 batadv_tvlv_handler_free_ref(tvlv_handler
);
1076 spin_lock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1077 hlist_del_rcu(&tvlv_handler
->list
);
1078 spin_unlock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1079 batadv_tvlv_handler_free_ref(tvlv_handler
);
1083 * batadv_tvlv_unicast_send - send a unicast packet with tvlv payload to the
1085 * @bat_priv: the bat priv with all the soft interface information
1086 * @src: source mac address of the unicast packet
1087 * @dst: destination mac address of the unicast packet
1089 * @version: tvlv version
1090 * @tvlv_value: tvlv content
1091 * @tvlv_value_len: tvlv content length
1093 void batadv_tvlv_unicast_send(struct batadv_priv
*bat_priv
, uint8_t *src
,
1094 uint8_t *dst
, uint8_t type
, uint8_t version
,
1095 void *tvlv_value
, uint16_t tvlv_value_len
)
1097 struct batadv_unicast_tvlv_packet
*unicast_tvlv_packet
;
1098 struct batadv_tvlv_hdr
*tvlv_hdr
;
1099 struct batadv_orig_node
*orig_node
;
1100 struct sk_buff
*skb
= NULL
;
1101 unsigned char *tvlv_buff
;
1102 unsigned int tvlv_len
;
1103 ssize_t hdr_len
= sizeof(*unicast_tvlv_packet
);
1106 orig_node
= batadv_orig_hash_find(bat_priv
, dst
);
1110 tvlv_len
= sizeof(*tvlv_hdr
) + tvlv_value_len
;
1112 skb
= netdev_alloc_skb_ip_align(NULL
, ETH_HLEN
+ hdr_len
+ tvlv_len
);
1116 skb
->priority
= TC_PRIO_CONTROL
;
1117 skb_reserve(skb
, ETH_HLEN
);
1118 tvlv_buff
= skb_put(skb
, sizeof(*unicast_tvlv_packet
) + tvlv_len
);
1119 unicast_tvlv_packet
= (struct batadv_unicast_tvlv_packet
*)tvlv_buff
;
1120 unicast_tvlv_packet
->packet_type
= BATADV_UNICAST_TVLV
;
1121 unicast_tvlv_packet
->version
= BATADV_COMPAT_VERSION
;
1122 unicast_tvlv_packet
->ttl
= BATADV_TTL
;
1123 unicast_tvlv_packet
->reserved
= 0;
1124 unicast_tvlv_packet
->tvlv_len
= htons(tvlv_len
);
1125 unicast_tvlv_packet
->align
= 0;
1126 memcpy(unicast_tvlv_packet
->src
, src
, ETH_ALEN
);
1127 memcpy(unicast_tvlv_packet
->dst
, dst
, ETH_ALEN
);
1129 tvlv_buff
= (unsigned char *)(unicast_tvlv_packet
+ 1);
1130 tvlv_hdr
= (struct batadv_tvlv_hdr
*)tvlv_buff
;
1131 tvlv_hdr
->version
= version
;
1132 tvlv_hdr
->type
= type
;
1133 tvlv_hdr
->len
= htons(tvlv_value_len
);
1134 tvlv_buff
+= sizeof(*tvlv_hdr
);
1135 memcpy(tvlv_buff
, tvlv_value
, tvlv_value_len
);
1137 if (batadv_send_skb_to_orig(skb
, orig_node
, NULL
) != NET_XMIT_DROP
)
1144 batadv_orig_node_free_ref(orig_node
);
1148 * batadv_get_vid - extract the VLAN identifier from skb if any
1149 * @skb: the buffer containing the packet
1150 * @header_len: length of the batman header preceding the ethernet header
1152 * If the packet embedded in the skb is vlan tagged this function returns the
1153 * VID with the BATADV_VLAN_HAS_TAG flag. Otherwise BATADV_NO_FLAGS is returned.
1155 unsigned short batadv_get_vid(struct sk_buff
*skb
, size_t header_len
)
1157 struct ethhdr
*ethhdr
= (struct ethhdr
*)(skb
->data
+ header_len
);
1158 struct vlan_ethhdr
*vhdr
;
1161 if (ethhdr
->h_proto
!= htons(ETH_P_8021Q
))
1162 return BATADV_NO_FLAGS
;
1164 if (!pskb_may_pull(skb
, header_len
+ VLAN_ETH_HLEN
))
1165 return BATADV_NO_FLAGS
;
1167 vhdr
= (struct vlan_ethhdr
*)(skb
->data
+ header_len
);
1168 vid
= ntohs(vhdr
->h_vlan_TCI
) & VLAN_VID_MASK
;
1169 vid
|= BATADV_VLAN_HAS_TAG
;
1174 static int batadv_param_set_ra(const char *val
, const struct kernel_param
*kp
)
1176 struct batadv_algo_ops
*bat_algo_ops
;
1177 char *algo_name
= (char *)val
;
1178 size_t name_len
= strlen(algo_name
);
1180 if (name_len
> 0 && algo_name
[name_len
- 1] == '\n')
1181 algo_name
[name_len
- 1] = '\0';
1183 bat_algo_ops
= batadv_algo_get(algo_name
);
1184 if (!bat_algo_ops
) {
1185 pr_err("Routing algorithm '%s' is not supported\n", algo_name
);
1189 return param_set_copystring(algo_name
, kp
);
1192 static const struct kernel_param_ops batadv_param_ops_ra
= {
1193 .set
= batadv_param_set_ra
,
1194 .get
= param_get_string
,
1197 static struct kparam_string batadv_param_string_ra
= {
1198 .maxlen
= sizeof(batadv_routing_algo
),
1199 .string
= batadv_routing_algo
,
1202 module_param_cb(routing_algo
, &batadv_param_ops_ra
, &batadv_param_string_ra
,
1204 module_init(batadv_init
);
1205 module_exit(batadv_exit
);
1207 MODULE_LICENSE("GPL");
1209 MODULE_AUTHOR(BATADV_DRIVER_AUTHOR
);
1210 MODULE_DESCRIPTION(BATADV_DRIVER_DESC
);
1211 MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE
);
1212 MODULE_VERSION(BATADV_SOURCE_VERSION
);