1 /* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors:
3 * Marek Lindner, Simon Wunderlich
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of version 2 of the GNU General Public
7 * License as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
20 #include <linux/crc32c.h>
21 #include <linux/highmem.h>
22 #include <linux/if_vlan.h>
25 #include <net/dsfield.h>
31 #include "originator.h"
32 #include "soft-interface.h"
33 #include "icmp_socket.h"
34 #include "translation-table.h"
35 #include "hard-interface.h"
36 #include "gateway_client.h"
37 #include "bridge_loop_avoidance.h"
38 #include "distributed-arp-table.h"
39 #include "gateway_common.h"
42 #include "network-coding.h"
43 #include "fragmentation.h"
46 /* List manipulations on hardif_list have to be rtnl_lock()'ed,
47 * list traversals just rcu-locked
49 struct list_head batadv_hardif_list
;
50 static int (*batadv_rx_handler
[256])(struct sk_buff
*,
51 struct batadv_hard_iface
*);
52 char batadv_routing_algo
[20] = "BATMAN_IV";
53 static struct hlist_head batadv_algo_list
;
55 unsigned char batadv_broadcast_addr
[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
57 struct workqueue_struct
*batadv_event_workqueue
;
59 static void batadv_recv_handler_init(void);
61 static int __init
batadv_init(void)
63 INIT_LIST_HEAD(&batadv_hardif_list
);
64 INIT_HLIST_HEAD(&batadv_algo_list
);
66 batadv_recv_handler_init();
71 batadv_event_workqueue
= create_singlethread_workqueue("bat_events");
73 if (!batadv_event_workqueue
)
77 batadv_debugfs_init();
79 register_netdevice_notifier(&batadv_hard_if_notifier
);
80 rtnl_link_register(&batadv_link_ops
);
82 pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n",
83 BATADV_SOURCE_VERSION
, BATADV_COMPAT_VERSION
);
88 static void __exit
batadv_exit(void)
90 batadv_debugfs_destroy();
91 rtnl_link_unregister(&batadv_link_ops
);
92 unregister_netdevice_notifier(&batadv_hard_if_notifier
);
93 batadv_hardif_remove_interfaces();
95 flush_workqueue(batadv_event_workqueue
);
96 destroy_workqueue(batadv_event_workqueue
);
97 batadv_event_workqueue
= NULL
;
102 int batadv_mesh_init(struct net_device
*soft_iface
)
104 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
107 spin_lock_init(&bat_priv
->forw_bat_list_lock
);
108 spin_lock_init(&bat_priv
->forw_bcast_list_lock
);
109 spin_lock_init(&bat_priv
->tt
.changes_list_lock
);
110 spin_lock_init(&bat_priv
->tt
.req_list_lock
);
111 spin_lock_init(&bat_priv
->tt
.roam_list_lock
);
112 spin_lock_init(&bat_priv
->tt
.last_changeset_lock
);
113 spin_lock_init(&bat_priv
->tt
.commit_lock
);
114 spin_lock_init(&bat_priv
->gw
.list_lock
);
115 spin_lock_init(&bat_priv
->tvlv
.container_list_lock
);
116 spin_lock_init(&bat_priv
->tvlv
.handler_list_lock
);
117 spin_lock_init(&bat_priv
->softif_vlan_list_lock
);
119 INIT_HLIST_HEAD(&bat_priv
->forw_bat_list
);
120 INIT_HLIST_HEAD(&bat_priv
->forw_bcast_list
);
121 INIT_HLIST_HEAD(&bat_priv
->gw
.list
);
122 INIT_LIST_HEAD(&bat_priv
->tt
.changes_list
);
123 INIT_LIST_HEAD(&bat_priv
->tt
.req_list
);
124 INIT_LIST_HEAD(&bat_priv
->tt
.roam_list
);
125 INIT_HLIST_HEAD(&bat_priv
->tvlv
.container_list
);
126 INIT_HLIST_HEAD(&bat_priv
->tvlv
.handler_list
);
127 INIT_HLIST_HEAD(&bat_priv
->softif_vlan_list
);
129 ret
= batadv_originator_init(bat_priv
);
133 ret
= batadv_tt_init(bat_priv
);
137 ret
= batadv_bla_init(bat_priv
);
141 ret
= batadv_dat_init(bat_priv
);
145 ret
= batadv_nc_mesh_init(bat_priv
);
149 batadv_gw_init(bat_priv
);
151 atomic_set(&bat_priv
->gw
.reselect
, 0);
152 atomic_set(&bat_priv
->mesh_state
, BATADV_MESH_ACTIVE
);
157 batadv_mesh_free(soft_iface
);
161 void batadv_mesh_free(struct net_device
*soft_iface
)
163 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
165 atomic_set(&bat_priv
->mesh_state
, BATADV_MESH_DEACTIVATING
);
167 batadv_purge_outstanding_packets(bat_priv
, NULL
);
169 batadv_gw_node_purge(bat_priv
);
170 batadv_nc_mesh_free(bat_priv
);
171 batadv_dat_free(bat_priv
);
172 batadv_bla_free(bat_priv
);
174 /* Free the TT and the originator tables only after having terminated
175 * all the other depending components which may use these structures for
178 batadv_tt_free(bat_priv
);
180 /* Since the originator table clean up routine is accessing the TT
181 * tables as well, it has to be invoked after the TT tables have been
182 * freed and marked as empty. This ensures that no cleanup RCU callbacks
183 * accessing the TT data are scheduled for later execution.
185 batadv_originator_free(bat_priv
);
187 batadv_gw_free(bat_priv
);
189 free_percpu(bat_priv
->bat_counters
);
190 bat_priv
->bat_counters
= NULL
;
192 atomic_set(&bat_priv
->mesh_state
, BATADV_MESH_INACTIVE
);
196 * batadv_is_my_mac - check if the given mac address belongs to any of the real
197 * interfaces in the current mesh
198 * @bat_priv: the bat priv with all the soft interface information
199 * @addr: the address to check
201 int batadv_is_my_mac(struct batadv_priv
*bat_priv
, const uint8_t *addr
)
203 const struct batadv_hard_iface
*hard_iface
;
206 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
207 if (hard_iface
->if_status
!= BATADV_IF_ACTIVE
)
210 if (hard_iface
->soft_iface
!= bat_priv
->soft_iface
)
213 if (batadv_compare_eth(hard_iface
->net_dev
->dev_addr
, addr
)) {
223 * batadv_seq_print_text_primary_if_get - called from debugfs table printing
224 * function that requires the primary interface
225 * @seq: debugfs table seq_file struct
227 * Returns primary interface if found or NULL otherwise.
229 struct batadv_hard_iface
*
230 batadv_seq_print_text_primary_if_get(struct seq_file
*seq
)
232 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
233 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
234 struct batadv_hard_iface
*primary_if
;
236 primary_if
= batadv_primary_if_get_selected(bat_priv
);
240 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
245 if (primary_if
->if_status
== BATADV_IF_ACTIVE
)
249 "BATMAN mesh %s disabled - primary interface not active\n",
251 batadv_hardif_free_ref(primary_if
);
259 * batadv_max_header_len - calculate maximum encapsulation overhead for a
262 * Return the maximum encapsulation overhead in bytes.
264 int batadv_max_header_len(void)
268 header_len
= max_t(int, header_len
,
269 sizeof(struct batadv_unicast_packet
));
270 header_len
= max_t(int, header_len
,
271 sizeof(struct batadv_unicast_4addr_packet
));
272 header_len
= max_t(int, header_len
,
273 sizeof(struct batadv_bcast_packet
));
275 #ifdef CONFIG_BATMAN_ADV_NC
276 header_len
= max_t(int, header_len
,
277 sizeof(struct batadv_coded_packet
));
284 * batadv_skb_set_priority - sets skb priority according to packet content
285 * @skb: the packet to be sent
286 * @offset: offset to the packet content
288 * This function sets a value between 256 and 263 (802.1d priority), which
289 * can be interpreted by the cfg80211 or other drivers.
291 void batadv_skb_set_priority(struct sk_buff
*skb
, int offset
)
293 struct iphdr ip_hdr_tmp
, *ip_hdr
;
294 struct ipv6hdr ip6_hdr_tmp
, *ip6_hdr
;
295 struct ethhdr ethhdr_tmp
, *ethhdr
;
296 struct vlan_ethhdr
*vhdr
, vhdr_tmp
;
299 /* already set, do nothing */
300 if (skb
->priority
>= 256 && skb
->priority
<= 263)
303 ethhdr
= skb_header_pointer(skb
, offset
, sizeof(*ethhdr
), ðhdr_tmp
);
307 switch (ethhdr
->h_proto
) {
308 case htons(ETH_P_8021Q
):
309 vhdr
= skb_header_pointer(skb
, offset
+ sizeof(*vhdr
),
310 sizeof(*vhdr
), &vhdr_tmp
);
313 prio
= ntohs(vhdr
->h_vlan_TCI
) & VLAN_PRIO_MASK
;
314 prio
= prio
>> VLAN_PRIO_SHIFT
;
316 case htons(ETH_P_IP
):
317 ip_hdr
= skb_header_pointer(skb
, offset
+ sizeof(*ethhdr
),
318 sizeof(*ip_hdr
), &ip_hdr_tmp
);
321 prio
= (ipv4_get_dsfield(ip_hdr
) & 0xfc) >> 5;
323 case htons(ETH_P_IPV6
):
324 ip6_hdr
= skb_header_pointer(skb
, offset
+ sizeof(*ethhdr
),
325 sizeof(*ip6_hdr
), &ip6_hdr_tmp
);
328 prio
= (ipv6_get_dsfield(ip6_hdr
) & 0xfc) >> 5;
334 skb
->priority
= prio
+ 256;
337 static int batadv_recv_unhandled_packet(struct sk_buff
*skb
,
338 struct batadv_hard_iface
*recv_if
)
343 /* incoming packets with the batman ethertype received on any active hard
346 int batadv_batman_skb_recv(struct sk_buff
*skb
, struct net_device
*dev
,
347 struct packet_type
*ptype
,
348 struct net_device
*orig_dev
)
350 struct batadv_priv
*bat_priv
;
351 struct batadv_ogm_packet
*batadv_ogm_packet
;
352 struct batadv_hard_iface
*hard_iface
;
356 hard_iface
= container_of(ptype
, struct batadv_hard_iface
,
358 skb
= skb_share_check(skb
, GFP_ATOMIC
);
360 /* skb was released by skb_share_check() */
364 /* packet should hold at least type and version */
365 if (unlikely(!pskb_may_pull(skb
, 2)))
368 /* expect a valid ethernet header here. */
369 if (unlikely(skb
->mac_len
!= ETH_HLEN
|| !skb_mac_header(skb
)))
372 if (!hard_iface
->soft_iface
)
375 bat_priv
= netdev_priv(hard_iface
->soft_iface
);
377 if (atomic_read(&bat_priv
->mesh_state
) != BATADV_MESH_ACTIVE
)
380 /* discard frames on not active interfaces */
381 if (hard_iface
->if_status
!= BATADV_IF_ACTIVE
)
384 batadv_ogm_packet
= (struct batadv_ogm_packet
*)skb
->data
;
386 if (batadv_ogm_packet
->header
.version
!= BATADV_COMPAT_VERSION
) {
387 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
388 "Drop packet: incompatible batman version (%i)\n",
389 batadv_ogm_packet
->header
.version
);
393 /* all receive handlers return whether they received or reused
394 * the supplied skb. if not, we have to free the skb.
396 idx
= batadv_ogm_packet
->header
.packet_type
;
397 ret
= (*batadv_rx_handler
[idx
])(skb
, hard_iface
);
399 if (ret
== NET_RX_DROP
)
402 /* return NET_RX_SUCCESS in any case as we
403 * most probably dropped the packet for
404 * routing-logical reasons.
406 return NET_RX_SUCCESS
;
414 static void batadv_recv_handler_init(void)
418 for (i
= 0; i
< ARRAY_SIZE(batadv_rx_handler
); i
++)
419 batadv_rx_handler
[i
] = batadv_recv_unhandled_packet
;
421 for (i
= BATADV_UNICAST_MIN
; i
<= BATADV_UNICAST_MAX
; i
++)
422 batadv_rx_handler
[i
] = batadv_recv_unhandled_unicast_packet
;
424 /* compile time checks for struct member offsets */
425 BUILD_BUG_ON(offsetof(struct batadv_unicast_4addr_packet
, src
) != 10);
426 BUILD_BUG_ON(offsetof(struct batadv_unicast_packet
, dest
) != 4);
427 BUILD_BUG_ON(offsetof(struct batadv_unicast_tvlv_packet
, dst
) != 4);
428 BUILD_BUG_ON(offsetof(struct batadv_frag_packet
, dest
) != 4);
429 BUILD_BUG_ON(offsetof(struct batadv_icmp_packet
, icmph
.dst
) != 4);
430 BUILD_BUG_ON(offsetof(struct batadv_icmp_packet_rr
, icmph
.dst
) != 4);
432 /* broadcast packet */
433 batadv_rx_handler
[BATADV_BCAST
] = batadv_recv_bcast_packet
;
435 /* unicast packets ... */
436 /* unicast with 4 addresses packet */
437 batadv_rx_handler
[BATADV_UNICAST_4ADDR
] = batadv_recv_unicast_packet
;
439 batadv_rx_handler
[BATADV_UNICAST
] = batadv_recv_unicast_packet
;
440 /* unicast tvlv packet */
441 batadv_rx_handler
[BATADV_UNICAST_TVLV
] = batadv_recv_unicast_tvlv
;
442 /* batman icmp packet */
443 batadv_rx_handler
[BATADV_ICMP
] = batadv_recv_icmp_packet
;
444 /* Fragmented packets */
445 batadv_rx_handler
[BATADV_UNICAST_FRAG
] = batadv_recv_frag_packet
;
449 batadv_recv_handler_register(uint8_t packet_type
,
450 int (*recv_handler
)(struct sk_buff
*,
451 struct batadv_hard_iface
*))
453 int (*curr
)(struct sk_buff
*,
454 struct batadv_hard_iface
*);
455 curr
= batadv_rx_handler
[packet_type
];
457 if ((curr
!= batadv_recv_unhandled_packet
) &&
458 (curr
!= batadv_recv_unhandled_unicast_packet
))
461 batadv_rx_handler
[packet_type
] = recv_handler
;
465 void batadv_recv_handler_unregister(uint8_t packet_type
)
467 batadv_rx_handler
[packet_type
] = batadv_recv_unhandled_packet
;
470 static struct batadv_algo_ops
*batadv_algo_get(char *name
)
472 struct batadv_algo_ops
*bat_algo_ops
= NULL
, *bat_algo_ops_tmp
;
474 hlist_for_each_entry(bat_algo_ops_tmp
, &batadv_algo_list
, list
) {
475 if (strcmp(bat_algo_ops_tmp
->name
, name
) != 0)
478 bat_algo_ops
= bat_algo_ops_tmp
;
485 int batadv_algo_register(struct batadv_algo_ops
*bat_algo_ops
)
487 struct batadv_algo_ops
*bat_algo_ops_tmp
;
490 bat_algo_ops_tmp
= batadv_algo_get(bat_algo_ops
->name
);
491 if (bat_algo_ops_tmp
) {
492 pr_info("Trying to register already registered routing algorithm: %s\n",
498 /* all algorithms must implement all ops (for now) */
499 if (!bat_algo_ops
->bat_iface_enable
||
500 !bat_algo_ops
->bat_iface_disable
||
501 !bat_algo_ops
->bat_iface_update_mac
||
502 !bat_algo_ops
->bat_primary_iface_set
||
503 !bat_algo_ops
->bat_ogm_schedule
||
504 !bat_algo_ops
->bat_ogm_emit
||
505 !bat_algo_ops
->bat_neigh_cmp
||
506 !bat_algo_ops
->bat_neigh_is_equiv_or_better
) {
507 pr_info("Routing algo '%s' does not implement required ops\n",
513 INIT_HLIST_NODE(&bat_algo_ops
->list
);
514 hlist_add_head(&bat_algo_ops
->list
, &batadv_algo_list
);
521 int batadv_algo_select(struct batadv_priv
*bat_priv
, char *name
)
523 struct batadv_algo_ops
*bat_algo_ops
;
526 bat_algo_ops
= batadv_algo_get(name
);
530 bat_priv
->bat_algo_ops
= bat_algo_ops
;
537 int batadv_algo_seq_print_text(struct seq_file
*seq
, void *offset
)
539 struct batadv_algo_ops
*bat_algo_ops
;
541 seq_puts(seq
, "Available routing algorithms:\n");
543 hlist_for_each_entry(bat_algo_ops
, &batadv_algo_list
, list
) {
544 seq_printf(seq
, "%s\n", bat_algo_ops
->name
);
551 * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in
553 * @skb: skb pointing to fragmented socket buffers
554 * @payload_ptr: Pointer to position inside the head buffer of the skb
555 * marking the start of the data to be CRC'ed
557 * payload_ptr must always point to an address in the skb head buffer and not to
560 __be32
batadv_skb_crc32(struct sk_buff
*skb
, u8
*payload_ptr
)
564 unsigned int to
= skb
->len
;
565 struct skb_seq_state st
;
568 unsigned int consumed
= 0;
570 from
= (unsigned int)(payload_ptr
- skb
->data
);
572 skb_prepare_seq_read(skb
, from
, to
, &st
);
573 while ((len
= skb_seq_read(consumed
, &data
, &st
)) != 0) {
574 crc
= crc32c(crc
, data
, len
);
582 * batadv_tvlv_handler_free_ref - decrement the tvlv handler refcounter and
584 * @tvlv_handler: the tvlv handler to free
587 batadv_tvlv_handler_free_ref(struct batadv_tvlv_handler
*tvlv_handler
)
589 if (atomic_dec_and_test(&tvlv_handler
->refcount
))
590 kfree_rcu(tvlv_handler
, rcu
);
594 * batadv_tvlv_handler_get - retrieve tvlv handler from the tvlv handler list
595 * based on the provided type and version (both need to match)
596 * @bat_priv: the bat priv with all the soft interface information
597 * @type: tvlv handler type to look for
598 * @version: tvlv handler version to look for
600 * Returns tvlv handler if found or NULL otherwise.
602 static struct batadv_tvlv_handler
603 *batadv_tvlv_handler_get(struct batadv_priv
*bat_priv
,
604 uint8_t type
, uint8_t version
)
606 struct batadv_tvlv_handler
*tvlv_handler_tmp
, *tvlv_handler
= NULL
;
609 hlist_for_each_entry_rcu(tvlv_handler_tmp
,
610 &bat_priv
->tvlv
.handler_list
, list
) {
611 if (tvlv_handler_tmp
->type
!= type
)
614 if (tvlv_handler_tmp
->version
!= version
)
617 if (!atomic_inc_not_zero(&tvlv_handler_tmp
->refcount
))
620 tvlv_handler
= tvlv_handler_tmp
;
629 * batadv_tvlv_container_free_ref - decrement the tvlv container refcounter and
631 * @tvlv_handler: the tvlv container to free
633 static void batadv_tvlv_container_free_ref(struct batadv_tvlv_container
*tvlv
)
635 if (atomic_dec_and_test(&tvlv
->refcount
))
640 * batadv_tvlv_container_get - retrieve tvlv container from the tvlv container
641 * list based on the provided type and version (both need to match)
642 * @bat_priv: the bat priv with all the soft interface information
643 * @type: tvlv container type to look for
644 * @version: tvlv container version to look for
646 * Has to be called with the appropriate locks being acquired
647 * (tvlv.container_list_lock).
649 * Returns tvlv container if found or NULL otherwise.
651 static struct batadv_tvlv_container
652 *batadv_tvlv_container_get(struct batadv_priv
*bat_priv
,
653 uint8_t type
, uint8_t version
)
655 struct batadv_tvlv_container
*tvlv_tmp
, *tvlv
= NULL
;
657 hlist_for_each_entry(tvlv_tmp
, &bat_priv
->tvlv
.container_list
, list
) {
658 if (tvlv_tmp
->tvlv_hdr
.type
!= type
)
661 if (tvlv_tmp
->tvlv_hdr
.version
!= version
)
664 if (!atomic_inc_not_zero(&tvlv_tmp
->refcount
))
675 * batadv_tvlv_container_list_size - calculate the size of the tvlv container
677 * @bat_priv: the bat priv with all the soft interface information
679 * Has to be called with the appropriate locks being acquired
680 * (tvlv.container_list_lock).
682 * Returns size of all currently registered tvlv containers in bytes.
684 static uint16_t batadv_tvlv_container_list_size(struct batadv_priv
*bat_priv
)
686 struct batadv_tvlv_container
*tvlv
;
687 uint16_t tvlv_len
= 0;
689 hlist_for_each_entry(tvlv
, &bat_priv
->tvlv
.container_list
, list
) {
690 tvlv_len
+= sizeof(struct batadv_tvlv_hdr
);
691 tvlv_len
+= ntohs(tvlv
->tvlv_hdr
.len
);
698 * batadv_tvlv_container_remove - remove tvlv container from the tvlv container
700 * @tvlv: the to be removed tvlv container
702 * Has to be called with the appropriate locks being acquired
703 * (tvlv.container_list_lock).
705 static void batadv_tvlv_container_remove(struct batadv_tvlv_container
*tvlv
)
710 hlist_del(&tvlv
->list
);
712 /* first call to decrement the counter, second call to free */
713 batadv_tvlv_container_free_ref(tvlv
);
714 batadv_tvlv_container_free_ref(tvlv
);
718 * batadv_tvlv_container_unregister - unregister tvlv container based on the
719 * provided type and version (both need to match)
720 * @bat_priv: the bat priv with all the soft interface information
721 * @type: tvlv container type to unregister
722 * @version: tvlv container type to unregister
724 void batadv_tvlv_container_unregister(struct batadv_priv
*bat_priv
,
725 uint8_t type
, uint8_t version
)
727 struct batadv_tvlv_container
*tvlv
;
729 spin_lock_bh(&bat_priv
->tvlv
.container_list_lock
);
730 tvlv
= batadv_tvlv_container_get(bat_priv
, type
, version
);
731 batadv_tvlv_container_remove(tvlv
);
732 spin_unlock_bh(&bat_priv
->tvlv
.container_list_lock
);
736 * batadv_tvlv_container_register - register tvlv type, version and content
737 * to be propagated with each (primary interface) OGM
738 * @bat_priv: the bat priv with all the soft interface information
739 * @type: tvlv container type
740 * @version: tvlv container version
741 * @tvlv_value: tvlv container content
742 * @tvlv_value_len: tvlv container content length
744 * If a container of the same type and version was already registered the new
745 * content is going to replace the old one.
747 void batadv_tvlv_container_register(struct batadv_priv
*bat_priv
,
748 uint8_t type
, uint8_t version
,
749 void *tvlv_value
, uint16_t tvlv_value_len
)
751 struct batadv_tvlv_container
*tvlv_old
, *tvlv_new
;
756 tvlv_new
= kzalloc(sizeof(*tvlv_new
) + tvlv_value_len
, GFP_ATOMIC
);
760 tvlv_new
->tvlv_hdr
.version
= version
;
761 tvlv_new
->tvlv_hdr
.type
= type
;
762 tvlv_new
->tvlv_hdr
.len
= htons(tvlv_value_len
);
764 memcpy(tvlv_new
+ 1, tvlv_value
, ntohs(tvlv_new
->tvlv_hdr
.len
));
765 INIT_HLIST_NODE(&tvlv_new
->list
);
766 atomic_set(&tvlv_new
->refcount
, 1);
768 spin_lock_bh(&bat_priv
->tvlv
.container_list_lock
);
769 tvlv_old
= batadv_tvlv_container_get(bat_priv
, type
, version
);
770 batadv_tvlv_container_remove(tvlv_old
);
771 hlist_add_head(&tvlv_new
->list
, &bat_priv
->tvlv
.container_list
);
772 spin_unlock_bh(&bat_priv
->tvlv
.container_list_lock
);
776 * batadv_tvlv_realloc_packet_buff - reallocate packet buffer to accomodate
777 * requested packet size
778 * @packet_buff: packet buffer
779 * @packet_buff_len: packet buffer size
780 * @packet_min_len: requested packet minimum size
781 * @additional_packet_len: requested additional packet size on top of minimum
784 * Returns true of the packet buffer could be changed to the requested size,
787 static bool batadv_tvlv_realloc_packet_buff(unsigned char **packet_buff
,
788 int *packet_buff_len
,
790 int additional_packet_len
)
792 unsigned char *new_buff
;
794 new_buff
= kmalloc(min_packet_len
+ additional_packet_len
, GFP_ATOMIC
);
796 /* keep old buffer if kmalloc should fail */
798 memcpy(new_buff
, *packet_buff
, min_packet_len
);
800 *packet_buff
= new_buff
;
801 *packet_buff_len
= min_packet_len
+ additional_packet_len
;
809 * batadv_tvlv_container_ogm_append - append tvlv container content to given
811 * @bat_priv: the bat priv with all the soft interface information
812 * @packet_buff: ogm packet buffer
813 * @packet_buff_len: ogm packet buffer size including ogm header and tvlv
815 * @packet_min_len: ogm header size to be preserved for the OGM itself
817 * The ogm packet might be enlarged or shrunk depending on the current size
818 * and the size of the to-be-appended tvlv containers.
820 * Returns size of all appended tvlv containers in bytes.
822 uint16_t batadv_tvlv_container_ogm_append(struct batadv_priv
*bat_priv
,
823 unsigned char **packet_buff
,
824 int *packet_buff_len
,
827 struct batadv_tvlv_container
*tvlv
;
828 struct batadv_tvlv_hdr
*tvlv_hdr
;
829 uint16_t tvlv_value_len
;
833 spin_lock_bh(&bat_priv
->tvlv
.container_list_lock
);
834 tvlv_value_len
= batadv_tvlv_container_list_size(bat_priv
);
836 ret
= batadv_tvlv_realloc_packet_buff(packet_buff
, packet_buff_len
,
837 packet_min_len
, tvlv_value_len
);
845 tvlv_value
= (*packet_buff
) + packet_min_len
;
847 hlist_for_each_entry(tvlv
, &bat_priv
->tvlv
.container_list
, list
) {
848 tvlv_hdr
= tvlv_value
;
849 tvlv_hdr
->type
= tvlv
->tvlv_hdr
.type
;
850 tvlv_hdr
->version
= tvlv
->tvlv_hdr
.version
;
851 tvlv_hdr
->len
= tvlv
->tvlv_hdr
.len
;
852 tvlv_value
= tvlv_hdr
+ 1;
853 memcpy(tvlv_value
, tvlv
+ 1, ntohs(tvlv
->tvlv_hdr
.len
));
854 tvlv_value
= (uint8_t *)tvlv_value
+ ntohs(tvlv
->tvlv_hdr
.len
);
858 spin_unlock_bh(&bat_priv
->tvlv
.container_list_lock
);
859 return tvlv_value_len
;
863 * batadv_tvlv_call_handler - parse the given tvlv buffer to call the
864 * appropriate handlers
865 * @bat_priv: the bat priv with all the soft interface information
866 * @tvlv_handler: tvlv callback function handling the tvlv content
867 * @ogm_source: flag indicating wether the tvlv is an ogm or a unicast packet
868 * @orig_node: orig node emitting the ogm packet
869 * @src: source mac address of the unicast packet
870 * @dst: destination mac address of the unicast packet
871 * @tvlv_value: tvlv content
872 * @tvlv_value_len: tvlv content length
874 * Returns success if handler was not found or the return value of the handler
877 static int batadv_tvlv_call_handler(struct batadv_priv
*bat_priv
,
878 struct batadv_tvlv_handler
*tvlv_handler
,
880 struct batadv_orig_node
*orig_node
,
881 uint8_t *src
, uint8_t *dst
,
882 void *tvlv_value
, uint16_t tvlv_value_len
)
885 return NET_RX_SUCCESS
;
888 if (!tvlv_handler
->ogm_handler
)
889 return NET_RX_SUCCESS
;
892 return NET_RX_SUCCESS
;
894 tvlv_handler
->ogm_handler(bat_priv
, orig_node
,
896 tvlv_value
, tvlv_value_len
);
897 tvlv_handler
->flags
|= BATADV_TVLV_HANDLER_OGM_CALLED
;
900 return NET_RX_SUCCESS
;
903 return NET_RX_SUCCESS
;
905 if (!tvlv_handler
->unicast_handler
)
906 return NET_RX_SUCCESS
;
908 return tvlv_handler
->unicast_handler(bat_priv
, src
,
913 return NET_RX_SUCCESS
;
917 * batadv_tvlv_containers_process - parse the given tvlv buffer to call the
918 * appropriate handlers
919 * @bat_priv: the bat priv with all the soft interface information
920 * @ogm_source: flag indicating wether the tvlv is an ogm or a unicast packet
921 * @orig_node: orig node emitting the ogm packet
922 * @src: source mac address of the unicast packet
923 * @dst: destination mac address of the unicast packet
924 * @tvlv_value: tvlv content
925 * @tvlv_value_len: tvlv content length
927 * Returns success when processing an OGM or the return value of all called
930 int batadv_tvlv_containers_process(struct batadv_priv
*bat_priv
,
932 struct batadv_orig_node
*orig_node
,
933 uint8_t *src
, uint8_t *dst
,
934 void *tvlv_value
, uint16_t tvlv_value_len
)
936 struct batadv_tvlv_handler
*tvlv_handler
;
937 struct batadv_tvlv_hdr
*tvlv_hdr
;
938 uint16_t tvlv_value_cont_len
;
939 uint8_t cifnotfound
= BATADV_TVLV_HANDLER_OGM_CIFNOTFND
;
940 int ret
= NET_RX_SUCCESS
;
942 while (tvlv_value_len
>= sizeof(*tvlv_hdr
)) {
943 tvlv_hdr
= tvlv_value
;
944 tvlv_value_cont_len
= ntohs(tvlv_hdr
->len
);
945 tvlv_value
= tvlv_hdr
+ 1;
946 tvlv_value_len
-= sizeof(*tvlv_hdr
);
948 if (tvlv_value_cont_len
> tvlv_value_len
)
951 tvlv_handler
= batadv_tvlv_handler_get(bat_priv
,
955 ret
|= batadv_tvlv_call_handler(bat_priv
, tvlv_handler
,
956 ogm_source
, orig_node
,
957 src
, dst
, tvlv_value
,
958 tvlv_value_cont_len
);
960 batadv_tvlv_handler_free_ref(tvlv_handler
);
961 tvlv_value
= (uint8_t *)tvlv_value
+ tvlv_value_cont_len
;
962 tvlv_value_len
-= tvlv_value_cont_len
;
969 hlist_for_each_entry_rcu(tvlv_handler
,
970 &bat_priv
->tvlv
.handler_list
, list
) {
971 if ((tvlv_handler
->flags
& BATADV_TVLV_HANDLER_OGM_CIFNOTFND
) &&
972 !(tvlv_handler
->flags
& BATADV_TVLV_HANDLER_OGM_CALLED
))
973 tvlv_handler
->ogm_handler(bat_priv
, orig_node
,
974 cifnotfound
, NULL
, 0);
976 tvlv_handler
->flags
&= ~BATADV_TVLV_HANDLER_OGM_CALLED
;
980 return NET_RX_SUCCESS
;
984 * batadv_tvlv_ogm_receive - process an incoming ogm and call the appropriate
986 * @bat_priv: the bat priv with all the soft interface information
987 * @batadv_ogm_packet: ogm packet containing the tvlv containers
988 * @orig_node: orig node emitting the ogm packet
990 void batadv_tvlv_ogm_receive(struct batadv_priv
*bat_priv
,
991 struct batadv_ogm_packet
*batadv_ogm_packet
,
992 struct batadv_orig_node
*orig_node
)
995 uint16_t tvlv_value_len
;
997 if (!batadv_ogm_packet
)
1000 tvlv_value_len
= ntohs(batadv_ogm_packet
->tvlv_len
);
1001 if (!tvlv_value_len
)
1004 tvlv_value
= batadv_ogm_packet
+ 1;
1006 batadv_tvlv_containers_process(bat_priv
, true, orig_node
, NULL
, NULL
,
1007 tvlv_value
, tvlv_value_len
);
1011 * batadv_tvlv_handler_register - register tvlv handler based on the provided
1012 * type and version (both need to match) for ogm tvlv payload and/or unicast
1014 * @bat_priv: the bat priv with all the soft interface information
1015 * @optr: ogm tvlv handler callback function. This function receives the orig
1016 * node, flags and the tvlv content as argument to process.
1017 * @uptr: unicast tvlv handler callback function. This function receives the
1018 * source & destination of the unicast packet as well as the tvlv content
1020 * @type: tvlv handler type to be registered
1021 * @version: tvlv handler version to be registered
1022 * @flags: flags to enable or disable TVLV API behavior
1024 void batadv_tvlv_handler_register(struct batadv_priv
*bat_priv
,
1025 void (*optr
)(struct batadv_priv
*bat_priv
,
1026 struct batadv_orig_node
*orig
,
1029 uint16_t tvlv_value_len
),
1030 int (*uptr
)(struct batadv_priv
*bat_priv
,
1031 uint8_t *src
, uint8_t *dst
,
1033 uint16_t tvlv_value_len
),
1034 uint8_t type
, uint8_t version
, uint8_t flags
)
1036 struct batadv_tvlv_handler
*tvlv_handler
;
1038 tvlv_handler
= batadv_tvlv_handler_get(bat_priv
, type
, version
);
1040 batadv_tvlv_handler_free_ref(tvlv_handler
);
1044 tvlv_handler
= kzalloc(sizeof(*tvlv_handler
), GFP_ATOMIC
);
1048 tvlv_handler
->ogm_handler
= optr
;
1049 tvlv_handler
->unicast_handler
= uptr
;
1050 tvlv_handler
->type
= type
;
1051 tvlv_handler
->version
= version
;
1052 tvlv_handler
->flags
= flags
;
1053 atomic_set(&tvlv_handler
->refcount
, 1);
1054 INIT_HLIST_NODE(&tvlv_handler
->list
);
1056 spin_lock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1057 hlist_add_head_rcu(&tvlv_handler
->list
, &bat_priv
->tvlv
.handler_list
);
1058 spin_unlock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1062 * batadv_tvlv_handler_unregister - unregister tvlv handler based on the
1063 * provided type and version (both need to match)
1064 * @bat_priv: the bat priv with all the soft interface information
1065 * @type: tvlv handler type to be unregistered
1066 * @version: tvlv handler version to be unregistered
1068 void batadv_tvlv_handler_unregister(struct batadv_priv
*bat_priv
,
1069 uint8_t type
, uint8_t version
)
1071 struct batadv_tvlv_handler
*tvlv_handler
;
1073 tvlv_handler
= batadv_tvlv_handler_get(bat_priv
, type
, version
);
1077 batadv_tvlv_handler_free_ref(tvlv_handler
);
1078 spin_lock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1079 hlist_del_rcu(&tvlv_handler
->list
);
1080 spin_unlock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1081 batadv_tvlv_handler_free_ref(tvlv_handler
);
1085 * batadv_tvlv_unicast_send - send a unicast packet with tvlv payload to the
1087 * @bat_priv: the bat priv with all the soft interface information
1088 * @src: source mac address of the unicast packet
1089 * @dst: destination mac address of the unicast packet
1091 * @version: tvlv version
1092 * @tvlv_value: tvlv content
1093 * @tvlv_value_len: tvlv content length
1095 void batadv_tvlv_unicast_send(struct batadv_priv
*bat_priv
, uint8_t *src
,
1096 uint8_t *dst
, uint8_t type
, uint8_t version
,
1097 void *tvlv_value
, uint16_t tvlv_value_len
)
1099 struct batadv_unicast_tvlv_packet
*unicast_tvlv_packet
;
1100 struct batadv_tvlv_hdr
*tvlv_hdr
;
1101 struct batadv_orig_node
*orig_node
;
1102 struct sk_buff
*skb
= NULL
;
1103 unsigned char *tvlv_buff
;
1104 unsigned int tvlv_len
;
1105 ssize_t hdr_len
= sizeof(*unicast_tvlv_packet
);
1108 orig_node
= batadv_orig_hash_find(bat_priv
, dst
);
1112 tvlv_len
= sizeof(*tvlv_hdr
) + tvlv_value_len
;
1114 skb
= netdev_alloc_skb_ip_align(NULL
, ETH_HLEN
+ hdr_len
+ tvlv_len
);
1118 skb
->priority
= TC_PRIO_CONTROL
;
1119 skb_reserve(skb
, ETH_HLEN
);
1120 tvlv_buff
= skb_put(skb
, sizeof(*unicast_tvlv_packet
) + tvlv_len
);
1121 unicast_tvlv_packet
= (struct batadv_unicast_tvlv_packet
*)tvlv_buff
;
1122 unicast_tvlv_packet
->header
.packet_type
= BATADV_UNICAST_TVLV
;
1123 unicast_tvlv_packet
->header
.version
= BATADV_COMPAT_VERSION
;
1124 unicast_tvlv_packet
->header
.ttl
= BATADV_TTL
;
1125 unicast_tvlv_packet
->reserved
= 0;
1126 unicast_tvlv_packet
->tvlv_len
= htons(tvlv_len
);
1127 unicast_tvlv_packet
->align
= 0;
1128 memcpy(unicast_tvlv_packet
->src
, src
, ETH_ALEN
);
1129 memcpy(unicast_tvlv_packet
->dst
, dst
, ETH_ALEN
);
1131 tvlv_buff
= (unsigned char *)(unicast_tvlv_packet
+ 1);
1132 tvlv_hdr
= (struct batadv_tvlv_hdr
*)tvlv_buff
;
1133 tvlv_hdr
->version
= version
;
1134 tvlv_hdr
->type
= type
;
1135 tvlv_hdr
->len
= htons(tvlv_value_len
);
1136 tvlv_buff
+= sizeof(*tvlv_hdr
);
1137 memcpy(tvlv_buff
, tvlv_value
, tvlv_value_len
);
1139 if (batadv_send_skb_to_orig(skb
, orig_node
, NULL
) != NET_XMIT_DROP
)
1146 batadv_orig_node_free_ref(orig_node
);
1150 * batadv_get_vid - extract the VLAN identifier from skb if any
1151 * @skb: the buffer containing the packet
1152 * @header_len: length of the batman header preceding the ethernet header
1154 * If the packet embedded in the skb is vlan tagged this function returns the
1155 * VID with the BATADV_VLAN_HAS_TAG flag. Otherwise BATADV_NO_FLAGS is returned.
1157 unsigned short batadv_get_vid(struct sk_buff
*skb
, size_t header_len
)
1159 struct ethhdr
*ethhdr
= (struct ethhdr
*)(skb
->data
+ header_len
);
1160 struct vlan_ethhdr
*vhdr
;
1163 if (ethhdr
->h_proto
!= htons(ETH_P_8021Q
))
1164 return BATADV_NO_FLAGS
;
1166 if (!pskb_may_pull(skb
, header_len
+ VLAN_ETH_HLEN
))
1167 return BATADV_NO_FLAGS
;
1169 vhdr
= (struct vlan_ethhdr
*)(skb
->data
+ header_len
);
1170 vid
= ntohs(vhdr
->h_vlan_TCI
) & VLAN_VID_MASK
;
1171 vid
|= BATADV_VLAN_HAS_TAG
;
1176 static int batadv_param_set_ra(const char *val
, const struct kernel_param
*kp
)
1178 struct batadv_algo_ops
*bat_algo_ops
;
1179 char *algo_name
= (char *)val
;
1180 size_t name_len
= strlen(algo_name
);
1182 if (name_len
> 0 && algo_name
[name_len
- 1] == '\n')
1183 algo_name
[name_len
- 1] = '\0';
1185 bat_algo_ops
= batadv_algo_get(algo_name
);
1186 if (!bat_algo_ops
) {
1187 pr_err("Routing algorithm '%s' is not supported\n", algo_name
);
1191 return param_set_copystring(algo_name
, kp
);
1194 static const struct kernel_param_ops batadv_param_ops_ra
= {
1195 .set
= batadv_param_set_ra
,
1196 .get
= param_get_string
,
1199 static struct kparam_string batadv_param_string_ra
= {
1200 .maxlen
= sizeof(batadv_routing_algo
),
1201 .string
= batadv_routing_algo
,
1204 module_param_cb(routing_algo
, &batadv_param_ops_ra
, &batadv_param_string_ra
,
1206 module_init(batadv_init
);
1207 module_exit(batadv_exit
);
1209 MODULE_LICENSE("GPL");
1211 MODULE_AUTHOR(BATADV_DRIVER_AUTHOR
);
1212 MODULE_DESCRIPTION(BATADV_DRIVER_DESC
);
1213 MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE
);
1214 MODULE_VERSION(BATADV_SOURCE_VERSION
);