1 /* Copyright (C) 2007-2014 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 "multicast.h"
38 #include "gateway_common.h"
41 #include "network-coding.h"
42 #include "fragmentation.h"
45 /* List manipulations on hardif_list have to be rtnl_lock()'ed,
46 * list traversals just rcu-locked
48 struct list_head batadv_hardif_list
;
49 static int (*batadv_rx_handler
[256])(struct sk_buff
*,
50 struct batadv_hard_iface
*);
51 char batadv_routing_algo
[20] = "BATMAN_IV";
52 static struct hlist_head batadv_algo_list
;
54 unsigned char batadv_broadcast_addr
[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
56 struct workqueue_struct
*batadv_event_workqueue
;
58 static void batadv_recv_handler_init(void);
60 static int __init
batadv_init(void)
62 INIT_LIST_HEAD(&batadv_hardif_list
);
63 INIT_HLIST_HEAD(&batadv_algo_list
);
65 batadv_recv_handler_init();
70 batadv_event_workqueue
= create_singlethread_workqueue("bat_events");
72 if (!batadv_event_workqueue
)
76 batadv_debugfs_init();
78 register_netdevice_notifier(&batadv_hard_if_notifier
);
79 rtnl_link_register(&batadv_link_ops
);
81 pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n",
82 BATADV_SOURCE_VERSION
, BATADV_COMPAT_VERSION
);
87 static void __exit
batadv_exit(void)
89 batadv_debugfs_destroy();
90 rtnl_link_unregister(&batadv_link_ops
);
91 unregister_netdevice_notifier(&batadv_hard_if_notifier
);
92 batadv_hardif_remove_interfaces();
94 flush_workqueue(batadv_event_workqueue
);
95 destroy_workqueue(batadv_event_workqueue
);
96 batadv_event_workqueue
= NULL
;
101 int batadv_mesh_init(struct net_device
*soft_iface
)
103 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
106 spin_lock_init(&bat_priv
->forw_bat_list_lock
);
107 spin_lock_init(&bat_priv
->forw_bcast_list_lock
);
108 spin_lock_init(&bat_priv
->tt
.changes_list_lock
);
109 spin_lock_init(&bat_priv
->tt
.req_list_lock
);
110 spin_lock_init(&bat_priv
->tt
.roam_list_lock
);
111 spin_lock_init(&bat_priv
->tt
.last_changeset_lock
);
112 spin_lock_init(&bat_priv
->tt
.commit_lock
);
113 spin_lock_init(&bat_priv
->gw
.list_lock
);
114 #ifdef CONFIG_BATMAN_ADV_MCAST
115 spin_lock_init(&bat_priv
->mcast
.want_lists_lock
);
117 spin_lock_init(&bat_priv
->tvlv
.container_list_lock
);
118 spin_lock_init(&bat_priv
->tvlv
.handler_list_lock
);
119 spin_lock_init(&bat_priv
->softif_vlan_list_lock
);
121 INIT_HLIST_HEAD(&bat_priv
->forw_bat_list
);
122 INIT_HLIST_HEAD(&bat_priv
->forw_bcast_list
);
123 INIT_HLIST_HEAD(&bat_priv
->gw
.list
);
124 #ifdef CONFIG_BATMAN_ADV_MCAST
125 INIT_HLIST_HEAD(&bat_priv
->mcast
.want_all_unsnoopables_list
);
126 INIT_HLIST_HEAD(&bat_priv
->mcast
.want_all_ipv4_list
);
127 INIT_HLIST_HEAD(&bat_priv
->mcast
.want_all_ipv6_list
);
129 INIT_LIST_HEAD(&bat_priv
->tt
.changes_list
);
130 INIT_LIST_HEAD(&bat_priv
->tt
.req_list
);
131 INIT_LIST_HEAD(&bat_priv
->tt
.roam_list
);
132 #ifdef CONFIG_BATMAN_ADV_MCAST
133 INIT_HLIST_HEAD(&bat_priv
->mcast
.mla_list
);
135 INIT_HLIST_HEAD(&bat_priv
->tvlv
.container_list
);
136 INIT_HLIST_HEAD(&bat_priv
->tvlv
.handler_list
);
137 INIT_HLIST_HEAD(&bat_priv
->softif_vlan_list
);
139 ret
= batadv_originator_init(bat_priv
);
143 ret
= batadv_tt_init(bat_priv
);
147 ret
= batadv_bla_init(bat_priv
);
151 ret
= batadv_dat_init(bat_priv
);
155 ret
= batadv_nc_mesh_init(bat_priv
);
159 batadv_gw_init(bat_priv
);
160 batadv_mcast_init(bat_priv
);
162 atomic_set(&bat_priv
->gw
.reselect
, 0);
163 atomic_set(&bat_priv
->mesh_state
, BATADV_MESH_ACTIVE
);
168 batadv_mesh_free(soft_iface
);
172 void batadv_mesh_free(struct net_device
*soft_iface
)
174 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
176 atomic_set(&bat_priv
->mesh_state
, BATADV_MESH_DEACTIVATING
);
178 batadv_purge_outstanding_packets(bat_priv
, NULL
);
180 batadv_gw_node_purge(bat_priv
);
181 batadv_nc_mesh_free(bat_priv
);
182 batadv_dat_free(bat_priv
);
183 batadv_bla_free(bat_priv
);
185 batadv_mcast_free(bat_priv
);
187 /* Free the TT and the originator tables only after having terminated
188 * all the other depending components which may use these structures for
191 batadv_tt_free(bat_priv
);
193 /* Since the originator table clean up routine is accessing the TT
194 * tables as well, it has to be invoked after the TT tables have been
195 * freed and marked as empty. This ensures that no cleanup RCU callbacks
196 * accessing the TT data are scheduled for later execution.
198 batadv_originator_free(bat_priv
);
200 batadv_gw_free(bat_priv
);
202 free_percpu(bat_priv
->bat_counters
);
203 bat_priv
->bat_counters
= NULL
;
205 atomic_set(&bat_priv
->mesh_state
, BATADV_MESH_INACTIVE
);
209 * batadv_is_my_mac - check if the given mac address belongs to any of the real
210 * interfaces in the current mesh
211 * @bat_priv: the bat priv with all the soft interface information
212 * @addr: the address to check
214 int batadv_is_my_mac(struct batadv_priv
*bat_priv
, const uint8_t *addr
)
216 const struct batadv_hard_iface
*hard_iface
;
219 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
220 if (hard_iface
->if_status
!= BATADV_IF_ACTIVE
)
223 if (hard_iface
->soft_iface
!= bat_priv
->soft_iface
)
226 if (batadv_compare_eth(hard_iface
->net_dev
->dev_addr
, addr
)) {
236 * batadv_seq_print_text_primary_if_get - called from debugfs table printing
237 * function that requires the primary interface
238 * @seq: debugfs table seq_file struct
240 * Returns primary interface if found or NULL otherwise.
242 struct batadv_hard_iface
*
243 batadv_seq_print_text_primary_if_get(struct seq_file
*seq
)
245 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
246 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
247 struct batadv_hard_iface
*primary_if
;
249 primary_if
= batadv_primary_if_get_selected(bat_priv
);
253 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
258 if (primary_if
->if_status
== BATADV_IF_ACTIVE
)
262 "BATMAN mesh %s disabled - primary interface not active\n",
264 batadv_hardif_free_ref(primary_if
);
272 * batadv_max_header_len - calculate maximum encapsulation overhead for a
275 * Return the maximum encapsulation overhead in bytes.
277 int batadv_max_header_len(void)
281 header_len
= max_t(int, header_len
,
282 sizeof(struct batadv_unicast_packet
));
283 header_len
= max_t(int, header_len
,
284 sizeof(struct batadv_unicast_4addr_packet
));
285 header_len
= max_t(int, header_len
,
286 sizeof(struct batadv_bcast_packet
));
288 #ifdef CONFIG_BATMAN_ADV_NC
289 header_len
= max_t(int, header_len
,
290 sizeof(struct batadv_coded_packet
));
293 return header_len
+ ETH_HLEN
;
297 * batadv_skb_set_priority - sets skb priority according to packet content
298 * @skb: the packet to be sent
299 * @offset: offset to the packet content
301 * This function sets a value between 256 and 263 (802.1d priority), which
302 * can be interpreted by the cfg80211 or other drivers.
304 void batadv_skb_set_priority(struct sk_buff
*skb
, int offset
)
306 struct iphdr ip_hdr_tmp
, *ip_hdr
;
307 struct ipv6hdr ip6_hdr_tmp
, *ip6_hdr
;
308 struct ethhdr ethhdr_tmp
, *ethhdr
;
309 struct vlan_ethhdr
*vhdr
, vhdr_tmp
;
312 /* already set, do nothing */
313 if (skb
->priority
>= 256 && skb
->priority
<= 263)
316 ethhdr
= skb_header_pointer(skb
, offset
, sizeof(*ethhdr
), ðhdr_tmp
);
320 switch (ethhdr
->h_proto
) {
321 case htons(ETH_P_8021Q
):
322 vhdr
= skb_header_pointer(skb
, offset
+ sizeof(*vhdr
),
323 sizeof(*vhdr
), &vhdr_tmp
);
326 prio
= ntohs(vhdr
->h_vlan_TCI
) & VLAN_PRIO_MASK
;
327 prio
= prio
>> VLAN_PRIO_SHIFT
;
329 case htons(ETH_P_IP
):
330 ip_hdr
= skb_header_pointer(skb
, offset
+ sizeof(*ethhdr
),
331 sizeof(*ip_hdr
), &ip_hdr_tmp
);
334 prio
= (ipv4_get_dsfield(ip_hdr
) & 0xfc) >> 5;
336 case htons(ETH_P_IPV6
):
337 ip6_hdr
= skb_header_pointer(skb
, offset
+ sizeof(*ethhdr
),
338 sizeof(*ip6_hdr
), &ip6_hdr_tmp
);
341 prio
= (ipv6_get_dsfield(ip6_hdr
) & 0xfc) >> 5;
347 skb
->priority
= prio
+ 256;
350 static int batadv_recv_unhandled_packet(struct sk_buff
*skb
,
351 struct batadv_hard_iface
*recv_if
)
356 /* incoming packets with the batman ethertype received on any active hard
359 int batadv_batman_skb_recv(struct sk_buff
*skb
, struct net_device
*dev
,
360 struct packet_type
*ptype
,
361 struct net_device
*orig_dev
)
363 struct batadv_priv
*bat_priv
;
364 struct batadv_ogm_packet
*batadv_ogm_packet
;
365 struct batadv_hard_iface
*hard_iface
;
369 hard_iface
= container_of(ptype
, struct batadv_hard_iface
,
371 skb
= skb_share_check(skb
, GFP_ATOMIC
);
373 /* skb was released by skb_share_check() */
377 /* packet should hold at least type and version */
378 if (unlikely(!pskb_may_pull(skb
, 2)))
381 /* expect a valid ethernet header here. */
382 if (unlikely(skb
->mac_len
!= ETH_HLEN
|| !skb_mac_header(skb
)))
385 if (!hard_iface
->soft_iface
)
388 bat_priv
= netdev_priv(hard_iface
->soft_iface
);
390 if (atomic_read(&bat_priv
->mesh_state
) != BATADV_MESH_ACTIVE
)
393 /* discard frames on not active interfaces */
394 if (hard_iface
->if_status
!= BATADV_IF_ACTIVE
)
397 batadv_ogm_packet
= (struct batadv_ogm_packet
*)skb
->data
;
399 if (batadv_ogm_packet
->version
!= BATADV_COMPAT_VERSION
) {
400 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
401 "Drop packet: incompatible batman version (%i)\n",
402 batadv_ogm_packet
->version
);
406 /* all receive handlers return whether they received or reused
407 * the supplied skb. if not, we have to free the skb.
409 idx
= batadv_ogm_packet
->packet_type
;
410 ret
= (*batadv_rx_handler
[idx
])(skb
, hard_iface
);
412 if (ret
== NET_RX_DROP
)
415 /* return NET_RX_SUCCESS in any case as we
416 * most probably dropped the packet for
417 * routing-logical reasons.
419 return NET_RX_SUCCESS
;
427 static void batadv_recv_handler_init(void)
431 for (i
= 0; i
< ARRAY_SIZE(batadv_rx_handler
); i
++)
432 batadv_rx_handler
[i
] = batadv_recv_unhandled_packet
;
434 for (i
= BATADV_UNICAST_MIN
; i
<= BATADV_UNICAST_MAX
; i
++)
435 batadv_rx_handler
[i
] = batadv_recv_unhandled_unicast_packet
;
437 /* compile time checks for sizes */
438 BUILD_BUG_ON(sizeof(struct batadv_bla_claim_dst
) != 6);
439 BUILD_BUG_ON(sizeof(struct batadv_ogm_packet
) != 24);
440 BUILD_BUG_ON(sizeof(struct batadv_icmp_header
) != 20);
441 BUILD_BUG_ON(sizeof(struct batadv_icmp_packet
) != 20);
442 BUILD_BUG_ON(sizeof(struct batadv_icmp_packet_rr
) != 116);
443 BUILD_BUG_ON(sizeof(struct batadv_unicast_packet
) != 10);
444 BUILD_BUG_ON(sizeof(struct batadv_unicast_4addr_packet
) != 18);
445 BUILD_BUG_ON(sizeof(struct batadv_frag_packet
) != 20);
446 BUILD_BUG_ON(sizeof(struct batadv_bcast_packet
) != 14);
447 BUILD_BUG_ON(sizeof(struct batadv_coded_packet
) != 46);
448 BUILD_BUG_ON(sizeof(struct batadv_unicast_tvlv_packet
) != 20);
449 BUILD_BUG_ON(sizeof(struct batadv_tvlv_hdr
) != 4);
450 BUILD_BUG_ON(sizeof(struct batadv_tvlv_gateway_data
) != 8);
451 BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_vlan_data
) != 8);
452 BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_change
) != 12);
453 BUILD_BUG_ON(sizeof(struct batadv_tvlv_roam_adv
) != 8);
455 /* broadcast packet */
456 batadv_rx_handler
[BATADV_BCAST
] = batadv_recv_bcast_packet
;
458 /* unicast packets ... */
459 /* unicast with 4 addresses packet */
460 batadv_rx_handler
[BATADV_UNICAST_4ADDR
] = batadv_recv_unicast_packet
;
462 batadv_rx_handler
[BATADV_UNICAST
] = batadv_recv_unicast_packet
;
463 /* unicast tvlv packet */
464 batadv_rx_handler
[BATADV_UNICAST_TVLV
] = batadv_recv_unicast_tvlv
;
465 /* batman icmp packet */
466 batadv_rx_handler
[BATADV_ICMP
] = batadv_recv_icmp_packet
;
467 /* Fragmented packets */
468 batadv_rx_handler
[BATADV_UNICAST_FRAG
] = batadv_recv_frag_packet
;
472 batadv_recv_handler_register(uint8_t packet_type
,
473 int (*recv_handler
)(struct sk_buff
*,
474 struct batadv_hard_iface
*))
476 int (*curr
)(struct sk_buff
*,
477 struct batadv_hard_iface
*);
478 curr
= batadv_rx_handler
[packet_type
];
480 if ((curr
!= batadv_recv_unhandled_packet
) &&
481 (curr
!= batadv_recv_unhandled_unicast_packet
))
484 batadv_rx_handler
[packet_type
] = recv_handler
;
488 void batadv_recv_handler_unregister(uint8_t packet_type
)
490 batadv_rx_handler
[packet_type
] = batadv_recv_unhandled_packet
;
493 static struct batadv_algo_ops
*batadv_algo_get(char *name
)
495 struct batadv_algo_ops
*bat_algo_ops
= NULL
, *bat_algo_ops_tmp
;
497 hlist_for_each_entry(bat_algo_ops_tmp
, &batadv_algo_list
, list
) {
498 if (strcmp(bat_algo_ops_tmp
->name
, name
) != 0)
501 bat_algo_ops
= bat_algo_ops_tmp
;
508 int batadv_algo_register(struct batadv_algo_ops
*bat_algo_ops
)
510 struct batadv_algo_ops
*bat_algo_ops_tmp
;
513 bat_algo_ops_tmp
= batadv_algo_get(bat_algo_ops
->name
);
514 if (bat_algo_ops_tmp
) {
515 pr_info("Trying to register already registered routing algorithm: %s\n",
521 /* all algorithms must implement all ops (for now) */
522 if (!bat_algo_ops
->bat_iface_enable
||
523 !bat_algo_ops
->bat_iface_disable
||
524 !bat_algo_ops
->bat_iface_update_mac
||
525 !bat_algo_ops
->bat_primary_iface_set
||
526 !bat_algo_ops
->bat_ogm_schedule
||
527 !bat_algo_ops
->bat_ogm_emit
||
528 !bat_algo_ops
->bat_neigh_cmp
||
529 !bat_algo_ops
->bat_neigh_is_equiv_or_better
) {
530 pr_info("Routing algo '%s' does not implement required ops\n",
536 INIT_HLIST_NODE(&bat_algo_ops
->list
);
537 hlist_add_head(&bat_algo_ops
->list
, &batadv_algo_list
);
544 int batadv_algo_select(struct batadv_priv
*bat_priv
, char *name
)
546 struct batadv_algo_ops
*bat_algo_ops
;
549 bat_algo_ops
= batadv_algo_get(name
);
553 bat_priv
->bat_algo_ops
= bat_algo_ops
;
560 int batadv_algo_seq_print_text(struct seq_file
*seq
, void *offset
)
562 struct batadv_algo_ops
*bat_algo_ops
;
564 seq_puts(seq
, "Available routing algorithms:\n");
566 hlist_for_each_entry(bat_algo_ops
, &batadv_algo_list
, list
) {
567 seq_printf(seq
, "%s\n", bat_algo_ops
->name
);
574 * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in
576 * @skb: skb pointing to fragmented socket buffers
577 * @payload_ptr: Pointer to position inside the head buffer of the skb
578 * marking the start of the data to be CRC'ed
580 * payload_ptr must always point to an address in the skb head buffer and not to
583 __be32
batadv_skb_crc32(struct sk_buff
*skb
, u8
*payload_ptr
)
587 unsigned int to
= skb
->len
;
588 struct skb_seq_state st
;
591 unsigned int consumed
= 0;
593 from
= (unsigned int)(payload_ptr
- skb
->data
);
595 skb_prepare_seq_read(skb
, from
, to
, &st
);
596 while ((len
= skb_seq_read(consumed
, &data
, &st
)) != 0) {
597 crc
= crc32c(crc
, data
, len
);
605 * batadv_tvlv_handler_free_ref - decrement the tvlv handler refcounter and
607 * @tvlv_handler: the tvlv handler to free
610 batadv_tvlv_handler_free_ref(struct batadv_tvlv_handler
*tvlv_handler
)
612 if (atomic_dec_and_test(&tvlv_handler
->refcount
))
613 kfree_rcu(tvlv_handler
, rcu
);
617 * batadv_tvlv_handler_get - retrieve tvlv handler from the tvlv handler list
618 * based on the provided type and version (both need to match)
619 * @bat_priv: the bat priv with all the soft interface information
620 * @type: tvlv handler type to look for
621 * @version: tvlv handler version to look for
623 * Returns tvlv handler if found or NULL otherwise.
625 static struct batadv_tvlv_handler
626 *batadv_tvlv_handler_get(struct batadv_priv
*bat_priv
,
627 uint8_t type
, uint8_t version
)
629 struct batadv_tvlv_handler
*tvlv_handler_tmp
, *tvlv_handler
= NULL
;
632 hlist_for_each_entry_rcu(tvlv_handler_tmp
,
633 &bat_priv
->tvlv
.handler_list
, list
) {
634 if (tvlv_handler_tmp
->type
!= type
)
637 if (tvlv_handler_tmp
->version
!= version
)
640 if (!atomic_inc_not_zero(&tvlv_handler_tmp
->refcount
))
643 tvlv_handler
= tvlv_handler_tmp
;
652 * batadv_tvlv_container_free_ref - decrement the tvlv container refcounter and
654 * @tvlv_handler: the tvlv container to free
656 static void batadv_tvlv_container_free_ref(struct batadv_tvlv_container
*tvlv
)
658 if (atomic_dec_and_test(&tvlv
->refcount
))
663 * batadv_tvlv_container_get - retrieve tvlv container from the tvlv container
664 * list based on the provided type and version (both need to match)
665 * @bat_priv: the bat priv with all the soft interface information
666 * @type: tvlv container type to look for
667 * @version: tvlv container version to look for
669 * Has to be called with the appropriate locks being acquired
670 * (tvlv.container_list_lock).
672 * Returns tvlv container if found or NULL otherwise.
674 static struct batadv_tvlv_container
675 *batadv_tvlv_container_get(struct batadv_priv
*bat_priv
,
676 uint8_t type
, uint8_t version
)
678 struct batadv_tvlv_container
*tvlv_tmp
, *tvlv
= NULL
;
680 hlist_for_each_entry(tvlv_tmp
, &bat_priv
->tvlv
.container_list
, list
) {
681 if (tvlv_tmp
->tvlv_hdr
.type
!= type
)
684 if (tvlv_tmp
->tvlv_hdr
.version
!= version
)
687 if (!atomic_inc_not_zero(&tvlv_tmp
->refcount
))
698 * batadv_tvlv_container_list_size - calculate the size of the tvlv container
700 * @bat_priv: the bat priv with all the soft interface information
702 * Has to be called with the appropriate locks being acquired
703 * (tvlv.container_list_lock).
705 * Returns size of all currently registered tvlv containers in bytes.
707 static uint16_t batadv_tvlv_container_list_size(struct batadv_priv
*bat_priv
)
709 struct batadv_tvlv_container
*tvlv
;
710 uint16_t tvlv_len
= 0;
712 hlist_for_each_entry(tvlv
, &bat_priv
->tvlv
.container_list
, list
) {
713 tvlv_len
+= sizeof(struct batadv_tvlv_hdr
);
714 tvlv_len
+= ntohs(tvlv
->tvlv_hdr
.len
);
721 * batadv_tvlv_container_remove - remove tvlv container from the tvlv container
723 * @tvlv: the to be removed tvlv container
725 * Has to be called with the appropriate locks being acquired
726 * (tvlv.container_list_lock).
728 static void batadv_tvlv_container_remove(struct batadv_tvlv_container
*tvlv
)
733 hlist_del(&tvlv
->list
);
735 /* first call to decrement the counter, second call to free */
736 batadv_tvlv_container_free_ref(tvlv
);
737 batadv_tvlv_container_free_ref(tvlv
);
741 * batadv_tvlv_container_unregister - unregister tvlv container based on the
742 * provided type and version (both need to match)
743 * @bat_priv: the bat priv with all the soft interface information
744 * @type: tvlv container type to unregister
745 * @version: tvlv container type to unregister
747 void batadv_tvlv_container_unregister(struct batadv_priv
*bat_priv
,
748 uint8_t type
, uint8_t version
)
750 struct batadv_tvlv_container
*tvlv
;
752 spin_lock_bh(&bat_priv
->tvlv
.container_list_lock
);
753 tvlv
= batadv_tvlv_container_get(bat_priv
, type
, version
);
754 batadv_tvlv_container_remove(tvlv
);
755 spin_unlock_bh(&bat_priv
->tvlv
.container_list_lock
);
759 * batadv_tvlv_container_register - register tvlv type, version and content
760 * to be propagated with each (primary interface) OGM
761 * @bat_priv: the bat priv with all the soft interface information
762 * @type: tvlv container type
763 * @version: tvlv container version
764 * @tvlv_value: tvlv container content
765 * @tvlv_value_len: tvlv container content length
767 * If a container of the same type and version was already registered the new
768 * content is going to replace the old one.
770 void batadv_tvlv_container_register(struct batadv_priv
*bat_priv
,
771 uint8_t type
, uint8_t version
,
772 void *tvlv_value
, uint16_t tvlv_value_len
)
774 struct batadv_tvlv_container
*tvlv_old
, *tvlv_new
;
779 tvlv_new
= kzalloc(sizeof(*tvlv_new
) + tvlv_value_len
, GFP_ATOMIC
);
783 tvlv_new
->tvlv_hdr
.version
= version
;
784 tvlv_new
->tvlv_hdr
.type
= type
;
785 tvlv_new
->tvlv_hdr
.len
= htons(tvlv_value_len
);
787 memcpy(tvlv_new
+ 1, tvlv_value
, ntohs(tvlv_new
->tvlv_hdr
.len
));
788 INIT_HLIST_NODE(&tvlv_new
->list
);
789 atomic_set(&tvlv_new
->refcount
, 1);
791 spin_lock_bh(&bat_priv
->tvlv
.container_list_lock
);
792 tvlv_old
= batadv_tvlv_container_get(bat_priv
, type
, version
);
793 batadv_tvlv_container_remove(tvlv_old
);
794 hlist_add_head(&tvlv_new
->list
, &bat_priv
->tvlv
.container_list
);
795 spin_unlock_bh(&bat_priv
->tvlv
.container_list_lock
);
799 * batadv_tvlv_realloc_packet_buff - reallocate packet buffer to accomodate
800 * requested packet size
801 * @packet_buff: packet buffer
802 * @packet_buff_len: packet buffer size
803 * @packet_min_len: requested packet minimum size
804 * @additional_packet_len: requested additional packet size on top of minimum
807 * Returns true of the packet buffer could be changed to the requested size,
810 static bool batadv_tvlv_realloc_packet_buff(unsigned char **packet_buff
,
811 int *packet_buff_len
,
813 int additional_packet_len
)
815 unsigned char *new_buff
;
817 new_buff
= kmalloc(min_packet_len
+ additional_packet_len
, GFP_ATOMIC
);
819 /* keep old buffer if kmalloc should fail */
821 memcpy(new_buff
, *packet_buff
, min_packet_len
);
823 *packet_buff
= new_buff
;
824 *packet_buff_len
= min_packet_len
+ additional_packet_len
;
832 * batadv_tvlv_container_ogm_append - append tvlv container content to given
834 * @bat_priv: the bat priv with all the soft interface information
835 * @packet_buff: ogm packet buffer
836 * @packet_buff_len: ogm packet buffer size including ogm header and tvlv
838 * @packet_min_len: ogm header size to be preserved for the OGM itself
840 * The ogm packet might be enlarged or shrunk depending on the current size
841 * and the size of the to-be-appended tvlv containers.
843 * Returns size of all appended tvlv containers in bytes.
845 uint16_t batadv_tvlv_container_ogm_append(struct batadv_priv
*bat_priv
,
846 unsigned char **packet_buff
,
847 int *packet_buff_len
,
850 struct batadv_tvlv_container
*tvlv
;
851 struct batadv_tvlv_hdr
*tvlv_hdr
;
852 uint16_t tvlv_value_len
;
856 spin_lock_bh(&bat_priv
->tvlv
.container_list_lock
);
857 tvlv_value_len
= batadv_tvlv_container_list_size(bat_priv
);
859 ret
= batadv_tvlv_realloc_packet_buff(packet_buff
, packet_buff_len
,
860 packet_min_len
, tvlv_value_len
);
868 tvlv_value
= (*packet_buff
) + packet_min_len
;
870 hlist_for_each_entry(tvlv
, &bat_priv
->tvlv
.container_list
, list
) {
871 tvlv_hdr
= tvlv_value
;
872 tvlv_hdr
->type
= tvlv
->tvlv_hdr
.type
;
873 tvlv_hdr
->version
= tvlv
->tvlv_hdr
.version
;
874 tvlv_hdr
->len
= tvlv
->tvlv_hdr
.len
;
875 tvlv_value
= tvlv_hdr
+ 1;
876 memcpy(tvlv_value
, tvlv
+ 1, ntohs(tvlv
->tvlv_hdr
.len
));
877 tvlv_value
= (uint8_t *)tvlv_value
+ ntohs(tvlv
->tvlv_hdr
.len
);
881 spin_unlock_bh(&bat_priv
->tvlv
.container_list_lock
);
882 return tvlv_value_len
;
886 * batadv_tvlv_call_handler - parse the given tvlv buffer to call the
887 * appropriate handlers
888 * @bat_priv: the bat priv with all the soft interface information
889 * @tvlv_handler: tvlv callback function handling the tvlv content
890 * @ogm_source: flag indicating wether the tvlv is an ogm or a unicast packet
891 * @orig_node: orig node emitting the ogm packet
892 * @src: source mac address of the unicast packet
893 * @dst: destination mac address of the unicast packet
894 * @tvlv_value: tvlv content
895 * @tvlv_value_len: tvlv content length
897 * Returns success if handler was not found or the return value of the handler
900 static int batadv_tvlv_call_handler(struct batadv_priv
*bat_priv
,
901 struct batadv_tvlv_handler
*tvlv_handler
,
903 struct batadv_orig_node
*orig_node
,
904 uint8_t *src
, uint8_t *dst
,
905 void *tvlv_value
, uint16_t tvlv_value_len
)
908 return NET_RX_SUCCESS
;
911 if (!tvlv_handler
->ogm_handler
)
912 return NET_RX_SUCCESS
;
915 return NET_RX_SUCCESS
;
917 tvlv_handler
->ogm_handler(bat_priv
, orig_node
,
919 tvlv_value
, tvlv_value_len
);
920 tvlv_handler
->flags
|= BATADV_TVLV_HANDLER_OGM_CALLED
;
923 return NET_RX_SUCCESS
;
926 return NET_RX_SUCCESS
;
928 if (!tvlv_handler
->unicast_handler
)
929 return NET_RX_SUCCESS
;
931 return tvlv_handler
->unicast_handler(bat_priv
, src
,
936 return NET_RX_SUCCESS
;
940 * batadv_tvlv_containers_process - parse the given tvlv buffer to call the
941 * appropriate handlers
942 * @bat_priv: the bat priv with all the soft interface information
943 * @ogm_source: flag indicating wether the tvlv is an ogm or a unicast packet
944 * @orig_node: orig node emitting the ogm packet
945 * @src: source mac address of the unicast packet
946 * @dst: destination mac address of the unicast packet
947 * @tvlv_value: tvlv content
948 * @tvlv_value_len: tvlv content length
950 * Returns success when processing an OGM or the return value of all called
953 int batadv_tvlv_containers_process(struct batadv_priv
*bat_priv
,
955 struct batadv_orig_node
*orig_node
,
956 uint8_t *src
, uint8_t *dst
,
957 void *tvlv_value
, uint16_t tvlv_value_len
)
959 struct batadv_tvlv_handler
*tvlv_handler
;
960 struct batadv_tvlv_hdr
*tvlv_hdr
;
961 uint16_t tvlv_value_cont_len
;
962 uint8_t cifnotfound
= BATADV_TVLV_HANDLER_OGM_CIFNOTFND
;
963 int ret
= NET_RX_SUCCESS
;
965 while (tvlv_value_len
>= sizeof(*tvlv_hdr
)) {
966 tvlv_hdr
= tvlv_value
;
967 tvlv_value_cont_len
= ntohs(tvlv_hdr
->len
);
968 tvlv_value
= tvlv_hdr
+ 1;
969 tvlv_value_len
-= sizeof(*tvlv_hdr
);
971 if (tvlv_value_cont_len
> tvlv_value_len
)
974 tvlv_handler
= batadv_tvlv_handler_get(bat_priv
,
978 ret
|= batadv_tvlv_call_handler(bat_priv
, tvlv_handler
,
979 ogm_source
, orig_node
,
980 src
, dst
, tvlv_value
,
981 tvlv_value_cont_len
);
983 batadv_tvlv_handler_free_ref(tvlv_handler
);
984 tvlv_value
= (uint8_t *)tvlv_value
+ tvlv_value_cont_len
;
985 tvlv_value_len
-= tvlv_value_cont_len
;
992 hlist_for_each_entry_rcu(tvlv_handler
,
993 &bat_priv
->tvlv
.handler_list
, list
) {
994 if ((tvlv_handler
->flags
& BATADV_TVLV_HANDLER_OGM_CIFNOTFND
) &&
995 !(tvlv_handler
->flags
& BATADV_TVLV_HANDLER_OGM_CALLED
))
996 tvlv_handler
->ogm_handler(bat_priv
, orig_node
,
997 cifnotfound
, NULL
, 0);
999 tvlv_handler
->flags
&= ~BATADV_TVLV_HANDLER_OGM_CALLED
;
1003 return NET_RX_SUCCESS
;
1007 * batadv_tvlv_ogm_receive - process an incoming ogm and call the appropriate
1009 * @bat_priv: the bat priv with all the soft interface information
1010 * @batadv_ogm_packet: ogm packet containing the tvlv containers
1011 * @orig_node: orig node emitting the ogm packet
1013 void batadv_tvlv_ogm_receive(struct batadv_priv
*bat_priv
,
1014 struct batadv_ogm_packet
*batadv_ogm_packet
,
1015 struct batadv_orig_node
*orig_node
)
1018 uint16_t tvlv_value_len
;
1020 if (!batadv_ogm_packet
)
1023 tvlv_value_len
= ntohs(batadv_ogm_packet
->tvlv_len
);
1024 if (!tvlv_value_len
)
1027 tvlv_value
= batadv_ogm_packet
+ 1;
1029 batadv_tvlv_containers_process(bat_priv
, true, orig_node
, NULL
, NULL
,
1030 tvlv_value
, tvlv_value_len
);
1034 * batadv_tvlv_handler_register - register tvlv handler based on the provided
1035 * type and version (both need to match) for ogm tvlv payload and/or unicast
1037 * @bat_priv: the bat priv with all the soft interface information
1038 * @optr: ogm tvlv handler callback function. This function receives the orig
1039 * node, flags and the tvlv content as argument to process.
1040 * @uptr: unicast tvlv handler callback function. This function receives the
1041 * source & destination of the unicast packet as well as the tvlv content
1043 * @type: tvlv handler type to be registered
1044 * @version: tvlv handler version to be registered
1045 * @flags: flags to enable or disable TVLV API behavior
1047 void batadv_tvlv_handler_register(struct batadv_priv
*bat_priv
,
1048 void (*optr
)(struct batadv_priv
*bat_priv
,
1049 struct batadv_orig_node
*orig
,
1052 uint16_t tvlv_value_len
),
1053 int (*uptr
)(struct batadv_priv
*bat_priv
,
1054 uint8_t *src
, uint8_t *dst
,
1056 uint16_t tvlv_value_len
),
1057 uint8_t type
, uint8_t version
, uint8_t flags
)
1059 struct batadv_tvlv_handler
*tvlv_handler
;
1061 tvlv_handler
= batadv_tvlv_handler_get(bat_priv
, type
, version
);
1063 batadv_tvlv_handler_free_ref(tvlv_handler
);
1067 tvlv_handler
= kzalloc(sizeof(*tvlv_handler
), GFP_ATOMIC
);
1071 tvlv_handler
->ogm_handler
= optr
;
1072 tvlv_handler
->unicast_handler
= uptr
;
1073 tvlv_handler
->type
= type
;
1074 tvlv_handler
->version
= version
;
1075 tvlv_handler
->flags
= flags
;
1076 atomic_set(&tvlv_handler
->refcount
, 1);
1077 INIT_HLIST_NODE(&tvlv_handler
->list
);
1079 spin_lock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1080 hlist_add_head_rcu(&tvlv_handler
->list
, &bat_priv
->tvlv
.handler_list
);
1081 spin_unlock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1085 * batadv_tvlv_handler_unregister - unregister tvlv handler based on the
1086 * provided type and version (both need to match)
1087 * @bat_priv: the bat priv with all the soft interface information
1088 * @type: tvlv handler type to be unregistered
1089 * @version: tvlv handler version to be unregistered
1091 void batadv_tvlv_handler_unregister(struct batadv_priv
*bat_priv
,
1092 uint8_t type
, uint8_t version
)
1094 struct batadv_tvlv_handler
*tvlv_handler
;
1096 tvlv_handler
= batadv_tvlv_handler_get(bat_priv
, type
, version
);
1100 batadv_tvlv_handler_free_ref(tvlv_handler
);
1101 spin_lock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1102 hlist_del_rcu(&tvlv_handler
->list
);
1103 spin_unlock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1104 batadv_tvlv_handler_free_ref(tvlv_handler
);
1108 * batadv_tvlv_unicast_send - send a unicast packet with tvlv payload to the
1110 * @bat_priv: the bat priv with all the soft interface information
1111 * @src: source mac address of the unicast packet
1112 * @dst: destination mac address of the unicast packet
1114 * @version: tvlv version
1115 * @tvlv_value: tvlv content
1116 * @tvlv_value_len: tvlv content length
1118 void batadv_tvlv_unicast_send(struct batadv_priv
*bat_priv
, uint8_t *src
,
1119 uint8_t *dst
, uint8_t type
, uint8_t version
,
1120 void *tvlv_value
, uint16_t tvlv_value_len
)
1122 struct batadv_unicast_tvlv_packet
*unicast_tvlv_packet
;
1123 struct batadv_tvlv_hdr
*tvlv_hdr
;
1124 struct batadv_orig_node
*orig_node
;
1125 struct sk_buff
*skb
= NULL
;
1126 unsigned char *tvlv_buff
;
1127 unsigned int tvlv_len
;
1128 ssize_t hdr_len
= sizeof(*unicast_tvlv_packet
);
1131 orig_node
= batadv_orig_hash_find(bat_priv
, dst
);
1135 tvlv_len
= sizeof(*tvlv_hdr
) + tvlv_value_len
;
1137 skb
= netdev_alloc_skb_ip_align(NULL
, ETH_HLEN
+ hdr_len
+ tvlv_len
);
1141 skb
->priority
= TC_PRIO_CONTROL
;
1142 skb_reserve(skb
, ETH_HLEN
);
1143 tvlv_buff
= skb_put(skb
, sizeof(*unicast_tvlv_packet
) + tvlv_len
);
1144 unicast_tvlv_packet
= (struct batadv_unicast_tvlv_packet
*)tvlv_buff
;
1145 unicast_tvlv_packet
->packet_type
= BATADV_UNICAST_TVLV
;
1146 unicast_tvlv_packet
->version
= BATADV_COMPAT_VERSION
;
1147 unicast_tvlv_packet
->ttl
= BATADV_TTL
;
1148 unicast_tvlv_packet
->reserved
= 0;
1149 unicast_tvlv_packet
->tvlv_len
= htons(tvlv_len
);
1150 unicast_tvlv_packet
->align
= 0;
1151 ether_addr_copy(unicast_tvlv_packet
->src
, src
);
1152 ether_addr_copy(unicast_tvlv_packet
->dst
, dst
);
1154 tvlv_buff
= (unsigned char *)(unicast_tvlv_packet
+ 1);
1155 tvlv_hdr
= (struct batadv_tvlv_hdr
*)tvlv_buff
;
1156 tvlv_hdr
->version
= version
;
1157 tvlv_hdr
->type
= type
;
1158 tvlv_hdr
->len
= htons(tvlv_value_len
);
1159 tvlv_buff
+= sizeof(*tvlv_hdr
);
1160 memcpy(tvlv_buff
, tvlv_value
, tvlv_value_len
);
1162 if (batadv_send_skb_to_orig(skb
, orig_node
, NULL
) != NET_XMIT_DROP
)
1169 batadv_orig_node_free_ref(orig_node
);
1173 * batadv_get_vid - extract the VLAN identifier from skb if any
1174 * @skb: the buffer containing the packet
1175 * @header_len: length of the batman header preceding the ethernet header
1177 * If the packet embedded in the skb is vlan tagged this function returns the
1178 * VID with the BATADV_VLAN_HAS_TAG flag. Otherwise BATADV_NO_FLAGS is returned.
1180 unsigned short batadv_get_vid(struct sk_buff
*skb
, size_t header_len
)
1182 struct ethhdr
*ethhdr
= (struct ethhdr
*)(skb
->data
+ header_len
);
1183 struct vlan_ethhdr
*vhdr
;
1186 if (ethhdr
->h_proto
!= htons(ETH_P_8021Q
))
1187 return BATADV_NO_FLAGS
;
1189 if (!pskb_may_pull(skb
, header_len
+ VLAN_ETH_HLEN
))
1190 return BATADV_NO_FLAGS
;
1192 vhdr
= (struct vlan_ethhdr
*)(skb
->data
+ header_len
);
1193 vid
= ntohs(vhdr
->h_vlan_TCI
) & VLAN_VID_MASK
;
1194 vid
|= BATADV_VLAN_HAS_TAG
;
1200 * batadv_vlan_ap_isola_get - return the AP isolation status for the given vlan
1201 * @bat_priv: the bat priv with all the soft interface information
1202 * @vid: the VLAN identifier for which the AP isolation attributed as to be
1205 * Returns true if AP isolation is on for the VLAN idenfied by vid, false
1208 bool batadv_vlan_ap_isola_get(struct batadv_priv
*bat_priv
, unsigned short vid
)
1210 bool ap_isolation_enabled
= false;
1211 struct batadv_softif_vlan
*vlan
;
1213 /* if the AP isolation is requested on a VLAN, then check for its
1214 * setting in the proper VLAN private data structure
1216 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
1218 ap_isolation_enabled
= atomic_read(&vlan
->ap_isolation
);
1219 batadv_softif_vlan_free_ref(vlan
);
1222 return ap_isolation_enabled
;
1225 static int batadv_param_set_ra(const char *val
, const struct kernel_param
*kp
)
1227 struct batadv_algo_ops
*bat_algo_ops
;
1228 char *algo_name
= (char *)val
;
1229 size_t name_len
= strlen(algo_name
);
1231 if (name_len
> 0 && algo_name
[name_len
- 1] == '\n')
1232 algo_name
[name_len
- 1] = '\0';
1234 bat_algo_ops
= batadv_algo_get(algo_name
);
1235 if (!bat_algo_ops
) {
1236 pr_err("Routing algorithm '%s' is not supported\n", algo_name
);
1240 return param_set_copystring(algo_name
, kp
);
1243 static const struct kernel_param_ops batadv_param_ops_ra
= {
1244 .set
= batadv_param_set_ra
,
1245 .get
= param_get_string
,
1248 static struct kparam_string batadv_param_string_ra
= {
1249 .maxlen
= sizeof(batadv_routing_algo
),
1250 .string
= batadv_routing_algo
,
1253 module_param_cb(routing_algo
, &batadv_param_ops_ra
, &batadv_param_string_ra
,
1255 module_init(batadv_init
);
1256 module_exit(batadv_exit
);
1258 MODULE_LICENSE("GPL");
1260 MODULE_AUTHOR(BATADV_DRIVER_AUTHOR
);
1261 MODULE_DESCRIPTION(BATADV_DRIVER_DESC
);
1262 MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE
);
1263 MODULE_VERSION(BATADV_SOURCE_VERSION
);