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"
40 #include "gateway_common.h"
43 #include "network-coding.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
->gw
.list_lock
);
114 spin_lock_init(&bat_priv
->tvlv
.container_list_lock
);
115 spin_lock_init(&bat_priv
->tvlv
.handler_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
);
126 ret
= batadv_originator_init(bat_priv
);
130 ret
= batadv_tt_init(bat_priv
);
134 batadv_tt_local_add(soft_iface
, soft_iface
->dev_addr
,
135 BATADV_NULL_IFINDEX
);
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_skb_set_priority - sets skb priority according to packet content
260 * @skb: the packet to be sent
261 * @offset: offset to the packet content
263 * This function sets a value between 256 and 263 (802.1d priority), which
264 * can be interpreted by the cfg80211 or other drivers.
266 void batadv_skb_set_priority(struct sk_buff
*skb
, int offset
)
268 struct iphdr ip_hdr_tmp
, *ip_hdr
;
269 struct ipv6hdr ip6_hdr_tmp
, *ip6_hdr
;
270 struct ethhdr ethhdr_tmp
, *ethhdr
;
271 struct vlan_ethhdr
*vhdr
, vhdr_tmp
;
274 /* already set, do nothing */
275 if (skb
->priority
>= 256 && skb
->priority
<= 263)
278 ethhdr
= skb_header_pointer(skb
, offset
, sizeof(*ethhdr
), ðhdr_tmp
);
282 switch (ethhdr
->h_proto
) {
283 case htons(ETH_P_8021Q
):
284 vhdr
= skb_header_pointer(skb
, offset
+ sizeof(*vhdr
),
285 sizeof(*vhdr
), &vhdr_tmp
);
288 prio
= ntohs(vhdr
->h_vlan_TCI
) & VLAN_PRIO_MASK
;
289 prio
= prio
>> VLAN_PRIO_SHIFT
;
291 case htons(ETH_P_IP
):
292 ip_hdr
= skb_header_pointer(skb
, offset
+ sizeof(*ethhdr
),
293 sizeof(*ip_hdr
), &ip_hdr_tmp
);
296 prio
= (ipv4_get_dsfield(ip_hdr
) & 0xfc) >> 5;
298 case htons(ETH_P_IPV6
):
299 ip6_hdr
= skb_header_pointer(skb
, offset
+ sizeof(*ethhdr
),
300 sizeof(*ip6_hdr
), &ip6_hdr_tmp
);
303 prio
= (ipv6_get_dsfield(ip6_hdr
) & 0xfc) >> 5;
309 skb
->priority
= prio
+ 256;
312 static int batadv_recv_unhandled_packet(struct sk_buff
*skb
,
313 struct batadv_hard_iface
*recv_if
)
318 /* incoming packets with the batman ethertype received on any active hard
321 int batadv_batman_skb_recv(struct sk_buff
*skb
, struct net_device
*dev
,
322 struct packet_type
*ptype
,
323 struct net_device
*orig_dev
)
325 struct batadv_priv
*bat_priv
;
326 struct batadv_ogm_packet
*batadv_ogm_packet
;
327 struct batadv_hard_iface
*hard_iface
;
331 hard_iface
= container_of(ptype
, struct batadv_hard_iface
,
333 skb
= skb_share_check(skb
, GFP_ATOMIC
);
335 /* skb was released by skb_share_check() */
339 /* packet should hold at least type and version */
340 if (unlikely(!pskb_may_pull(skb
, 2)))
343 /* expect a valid ethernet header here. */
344 if (unlikely(skb
->mac_len
!= ETH_HLEN
|| !skb_mac_header(skb
)))
347 if (!hard_iface
->soft_iface
)
350 bat_priv
= netdev_priv(hard_iface
->soft_iface
);
352 if (atomic_read(&bat_priv
->mesh_state
) != BATADV_MESH_ACTIVE
)
355 /* discard frames on not active interfaces */
356 if (hard_iface
->if_status
!= BATADV_IF_ACTIVE
)
359 batadv_ogm_packet
= (struct batadv_ogm_packet
*)skb
->data
;
361 if (batadv_ogm_packet
->header
.version
!= BATADV_COMPAT_VERSION
) {
362 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
363 "Drop packet: incompatible batman version (%i)\n",
364 batadv_ogm_packet
->header
.version
);
368 /* all receive handlers return whether they received or reused
369 * the supplied skb. if not, we have to free the skb.
371 idx
= batadv_ogm_packet
->header
.packet_type
;
372 ret
= (*batadv_rx_handler
[idx
])(skb
, hard_iface
);
374 if (ret
== NET_RX_DROP
)
377 /* return NET_RX_SUCCESS in any case as we
378 * most probably dropped the packet for
379 * routing-logical reasons.
381 return NET_RX_SUCCESS
;
389 static void batadv_recv_handler_init(void)
393 for (i
= 0; i
< ARRAY_SIZE(batadv_rx_handler
); i
++)
394 batadv_rx_handler
[i
] = batadv_recv_unhandled_packet
;
396 /* compile time checks for struct member offsets */
397 BUILD_BUG_ON(offsetof(struct batadv_unicast_4addr_packet
, src
) != 10);
398 BUILD_BUG_ON(offsetof(struct batadv_unicast_packet
, dest
) != 4);
399 BUILD_BUG_ON(offsetof(struct batadv_unicast_frag_packet
, dest
) != 4);
400 BUILD_BUG_ON(offsetof(struct batadv_unicast_tvlv_packet
, dst
) != 4);
401 BUILD_BUG_ON(offsetof(struct batadv_icmp_packet
, dst
) != 4);
402 BUILD_BUG_ON(offsetof(struct batadv_icmp_packet_rr
, dst
) != 4);
404 /* batman icmp packet */
405 batadv_rx_handler
[BATADV_ICMP
] = batadv_recv_icmp_packet
;
406 /* unicast with 4 addresses packet */
407 batadv_rx_handler
[BATADV_UNICAST_4ADDR
] = batadv_recv_unicast_packet
;
409 batadv_rx_handler
[BATADV_UNICAST
] = batadv_recv_unicast_packet
;
410 /* fragmented unicast packet */
411 batadv_rx_handler
[BATADV_UNICAST_FRAG
] = batadv_recv_ucast_frag_packet
;
412 /* broadcast packet */
413 batadv_rx_handler
[BATADV_BCAST
] = batadv_recv_bcast_packet
;
414 /* unicast tvlv packet */
415 batadv_rx_handler
[BATADV_UNICAST_TVLV
] = batadv_recv_unicast_tvlv
;
419 batadv_recv_handler_register(uint8_t packet_type
,
420 int (*recv_handler
)(struct sk_buff
*,
421 struct batadv_hard_iface
*))
423 if (batadv_rx_handler
[packet_type
] != &batadv_recv_unhandled_packet
)
426 batadv_rx_handler
[packet_type
] = recv_handler
;
430 void batadv_recv_handler_unregister(uint8_t packet_type
)
432 batadv_rx_handler
[packet_type
] = batadv_recv_unhandled_packet
;
435 static struct batadv_algo_ops
*batadv_algo_get(char *name
)
437 struct batadv_algo_ops
*bat_algo_ops
= NULL
, *bat_algo_ops_tmp
;
439 hlist_for_each_entry(bat_algo_ops_tmp
, &batadv_algo_list
, list
) {
440 if (strcmp(bat_algo_ops_tmp
->name
, name
) != 0)
443 bat_algo_ops
= bat_algo_ops_tmp
;
450 int batadv_algo_register(struct batadv_algo_ops
*bat_algo_ops
)
452 struct batadv_algo_ops
*bat_algo_ops_tmp
;
455 bat_algo_ops_tmp
= batadv_algo_get(bat_algo_ops
->name
);
456 if (bat_algo_ops_tmp
) {
457 pr_info("Trying to register already registered routing algorithm: %s\n",
463 /* all algorithms must implement all ops (for now) */
464 if (!bat_algo_ops
->bat_iface_enable
||
465 !bat_algo_ops
->bat_iface_disable
||
466 !bat_algo_ops
->bat_iface_update_mac
||
467 !bat_algo_ops
->bat_primary_iface_set
||
468 !bat_algo_ops
->bat_ogm_schedule
||
469 !bat_algo_ops
->bat_ogm_emit
) {
470 pr_info("Routing algo '%s' does not implement required ops\n",
476 INIT_HLIST_NODE(&bat_algo_ops
->list
);
477 hlist_add_head(&bat_algo_ops
->list
, &batadv_algo_list
);
484 int batadv_algo_select(struct batadv_priv
*bat_priv
, char *name
)
486 struct batadv_algo_ops
*bat_algo_ops
;
489 bat_algo_ops
= batadv_algo_get(name
);
493 bat_priv
->bat_algo_ops
= bat_algo_ops
;
500 int batadv_algo_seq_print_text(struct seq_file
*seq
, void *offset
)
502 struct batadv_algo_ops
*bat_algo_ops
;
504 seq_puts(seq
, "Available routing algorithms:\n");
506 hlist_for_each_entry(bat_algo_ops
, &batadv_algo_list
, list
) {
507 seq_printf(seq
, "%s\n", bat_algo_ops
->name
);
514 * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in
516 * @skb: skb pointing to fragmented socket buffers
517 * @payload_ptr: Pointer to position inside the head buffer of the skb
518 * marking the start of the data to be CRC'ed
520 * payload_ptr must always point to an address in the skb head buffer and not to
523 __be32
batadv_skb_crc32(struct sk_buff
*skb
, u8
*payload_ptr
)
527 unsigned int to
= skb
->len
;
528 struct skb_seq_state st
;
531 unsigned int consumed
= 0;
533 from
= (unsigned int)(payload_ptr
- skb
->data
);
535 skb_prepare_seq_read(skb
, from
, to
, &st
);
536 while ((len
= skb_seq_read(consumed
, &data
, &st
)) != 0) {
537 crc
= crc32c(crc
, data
, len
);
545 * batadv_tvlv_handler_free_ref - decrement the tvlv handler refcounter and
547 * @tvlv_handler: the tvlv handler to free
550 batadv_tvlv_handler_free_ref(struct batadv_tvlv_handler
*tvlv_handler
)
552 if (atomic_dec_and_test(&tvlv_handler
->refcount
))
553 kfree_rcu(tvlv_handler
, rcu
);
557 * batadv_tvlv_handler_get - retrieve tvlv handler from the tvlv handler list
558 * based on the provided type and version (both need to match)
559 * @bat_priv: the bat priv with all the soft interface information
560 * @type: tvlv handler type to look for
561 * @version: tvlv handler version to look for
563 * Returns tvlv handler if found or NULL otherwise.
565 static struct batadv_tvlv_handler
566 *batadv_tvlv_handler_get(struct batadv_priv
*bat_priv
,
567 uint8_t type
, uint8_t version
)
569 struct batadv_tvlv_handler
*tvlv_handler_tmp
, *tvlv_handler
= NULL
;
572 hlist_for_each_entry_rcu(tvlv_handler_tmp
,
573 &bat_priv
->tvlv
.handler_list
, list
) {
574 if (tvlv_handler_tmp
->type
!= type
)
577 if (tvlv_handler_tmp
->version
!= version
)
580 if (!atomic_inc_not_zero(&tvlv_handler_tmp
->refcount
))
583 tvlv_handler
= tvlv_handler_tmp
;
592 * batadv_tvlv_container_free_ref - decrement the tvlv container refcounter and
594 * @tvlv_handler: the tvlv container to free
596 static void batadv_tvlv_container_free_ref(struct batadv_tvlv_container
*tvlv
)
598 if (atomic_dec_and_test(&tvlv
->refcount
))
603 * batadv_tvlv_container_get - retrieve tvlv container from the tvlv container
604 * list based on the provided type and version (both need to match)
605 * @bat_priv: the bat priv with all the soft interface information
606 * @type: tvlv container type to look for
607 * @version: tvlv container version to look for
609 * Has to be called with the appropriate locks being acquired
610 * (tvlv.container_list_lock).
612 * Returns tvlv container if found or NULL otherwise.
614 static struct batadv_tvlv_container
615 *batadv_tvlv_container_get(struct batadv_priv
*bat_priv
,
616 uint8_t type
, uint8_t version
)
618 struct batadv_tvlv_container
*tvlv_tmp
, *tvlv
= NULL
;
620 hlist_for_each_entry(tvlv_tmp
, &bat_priv
->tvlv
.container_list
, list
) {
621 if (tvlv_tmp
->tvlv_hdr
.type
!= type
)
624 if (tvlv_tmp
->tvlv_hdr
.version
!= version
)
627 if (!atomic_inc_not_zero(&tvlv_tmp
->refcount
))
638 * batadv_tvlv_container_list_size - calculate the size of the tvlv container
640 * @bat_priv: the bat priv with all the soft interface information
642 * Has to be called with the appropriate locks being acquired
643 * (tvlv.container_list_lock).
645 * Returns size of all currently registered tvlv containers in bytes.
647 static uint16_t batadv_tvlv_container_list_size(struct batadv_priv
*bat_priv
)
649 struct batadv_tvlv_container
*tvlv
;
650 uint16_t tvlv_len
= 0;
652 hlist_for_each_entry(tvlv
, &bat_priv
->tvlv
.container_list
, list
) {
653 tvlv_len
+= sizeof(struct batadv_tvlv_hdr
);
654 tvlv_len
+= ntohs(tvlv
->tvlv_hdr
.len
);
661 * batadv_tvlv_container_remove - remove tvlv container from the tvlv container
663 * @tvlv: the to be removed tvlv container
665 * Has to be called with the appropriate locks being acquired
666 * (tvlv.container_list_lock).
668 static void batadv_tvlv_container_remove(struct batadv_tvlv_container
*tvlv
)
673 hlist_del(&tvlv
->list
);
675 /* first call to decrement the counter, second call to free */
676 batadv_tvlv_container_free_ref(tvlv
);
677 batadv_tvlv_container_free_ref(tvlv
);
681 * batadv_tvlv_container_unregister - unregister tvlv container based on the
682 * provided type and version (both need to match)
683 * @bat_priv: the bat priv with all the soft interface information
684 * @type: tvlv container type to unregister
685 * @version: tvlv container type to unregister
687 void batadv_tvlv_container_unregister(struct batadv_priv
*bat_priv
,
688 uint8_t type
, uint8_t version
)
690 struct batadv_tvlv_container
*tvlv
;
692 spin_lock_bh(&bat_priv
->tvlv
.container_list_lock
);
693 tvlv
= batadv_tvlv_container_get(bat_priv
, type
, version
);
694 batadv_tvlv_container_remove(tvlv
);
695 spin_unlock_bh(&bat_priv
->tvlv
.container_list_lock
);
699 * batadv_tvlv_container_register - register tvlv type, version and content
700 * to be propagated with each (primary interface) OGM
701 * @bat_priv: the bat priv with all the soft interface information
702 * @type: tvlv container type
703 * @version: tvlv container version
704 * @tvlv_value: tvlv container content
705 * @tvlv_value_len: tvlv container content length
707 * If a container of the same type and version was already registered the new
708 * content is going to replace the old one.
710 void batadv_tvlv_container_register(struct batadv_priv
*bat_priv
,
711 uint8_t type
, uint8_t version
,
712 void *tvlv_value
, uint16_t tvlv_value_len
)
714 struct batadv_tvlv_container
*tvlv_old
, *tvlv_new
;
719 tvlv_new
= kzalloc(sizeof(*tvlv_new
) + tvlv_value_len
, GFP_ATOMIC
);
723 tvlv_new
->tvlv_hdr
.version
= version
;
724 tvlv_new
->tvlv_hdr
.type
= type
;
725 tvlv_new
->tvlv_hdr
.len
= htons(tvlv_value_len
);
727 memcpy(tvlv_new
+ 1, tvlv_value
, ntohs(tvlv_new
->tvlv_hdr
.len
));
728 INIT_HLIST_NODE(&tvlv_new
->list
);
729 atomic_set(&tvlv_new
->refcount
, 1);
731 spin_lock_bh(&bat_priv
->tvlv
.container_list_lock
);
732 tvlv_old
= batadv_tvlv_container_get(bat_priv
, type
, version
);
733 batadv_tvlv_container_remove(tvlv_old
);
734 hlist_add_head(&tvlv_new
->list
, &bat_priv
->tvlv
.container_list
);
735 spin_unlock_bh(&bat_priv
->tvlv
.container_list_lock
);
739 * batadv_tvlv_realloc_packet_buff - reallocate packet buffer to accomodate
740 * requested packet size
741 * @packet_buff: packet buffer
742 * @packet_buff_len: packet buffer size
743 * @packet_min_len: requested packet minimum size
744 * @additional_packet_len: requested additional packet size on top of minimum
747 * Returns true of the packet buffer could be changed to the requested size,
750 static bool batadv_tvlv_realloc_packet_buff(unsigned char **packet_buff
,
751 int *packet_buff_len
,
753 int additional_packet_len
)
755 unsigned char *new_buff
;
757 new_buff
= kmalloc(min_packet_len
+ additional_packet_len
, GFP_ATOMIC
);
759 /* keep old buffer if kmalloc should fail */
761 memcpy(new_buff
, *packet_buff
, min_packet_len
);
763 *packet_buff
= new_buff
;
764 *packet_buff_len
= min_packet_len
+ additional_packet_len
;
772 * batadv_tvlv_container_ogm_append - append tvlv container content to given
774 * @bat_priv: the bat priv with all the soft interface information
775 * @packet_buff: ogm packet buffer
776 * @packet_buff_len: ogm packet buffer size including ogm header and tvlv
778 * @packet_min_len: ogm header size to be preserved for the OGM itself
780 * The ogm packet might be enlarged or shrunk depending on the current size
781 * and the size of the to-be-appended tvlv containers.
783 * Returns size of all appended tvlv containers in bytes.
785 uint16_t batadv_tvlv_container_ogm_append(struct batadv_priv
*bat_priv
,
786 unsigned char **packet_buff
,
787 int *packet_buff_len
,
790 struct batadv_tvlv_container
*tvlv
;
791 struct batadv_tvlv_hdr
*tvlv_hdr
;
792 uint16_t tvlv_value_len
;
796 spin_lock_bh(&bat_priv
->tvlv
.container_list_lock
);
797 tvlv_value_len
= batadv_tvlv_container_list_size(bat_priv
);
799 ret
= batadv_tvlv_realloc_packet_buff(packet_buff
, packet_buff_len
,
800 packet_min_len
, tvlv_value_len
);
808 tvlv_value
= (*packet_buff
) + packet_min_len
;
810 hlist_for_each_entry(tvlv
, &bat_priv
->tvlv
.container_list
, list
) {
811 tvlv_hdr
= tvlv_value
;
812 tvlv_hdr
->type
= tvlv
->tvlv_hdr
.type
;
813 tvlv_hdr
->version
= tvlv
->tvlv_hdr
.version
;
814 tvlv_hdr
->len
= tvlv
->tvlv_hdr
.len
;
815 tvlv_value
= tvlv_hdr
+ 1;
816 memcpy(tvlv_value
, tvlv
+ 1, ntohs(tvlv
->tvlv_hdr
.len
));
817 tvlv_value
= (uint8_t *)tvlv_value
+ ntohs(tvlv
->tvlv_hdr
.len
);
821 spin_unlock_bh(&bat_priv
->tvlv
.container_list_lock
);
822 return tvlv_value_len
;
826 * batadv_tvlv_call_handler - parse the given tvlv buffer to call the
827 * appropriate handlers
828 * @bat_priv: the bat priv with all the soft interface information
829 * @tvlv_handler: tvlv callback function handling the tvlv content
830 * @ogm_source: flag indicating wether the tvlv is an ogm or a unicast packet
831 * @orig_node: orig node emitting the ogm packet
832 * @src: source mac address of the unicast packet
833 * @dst: destination mac address of the unicast packet
834 * @tvlv_value: tvlv content
835 * @tvlv_value_len: tvlv content length
837 * Returns success if handler was not found or the return value of the handler
840 static int batadv_tvlv_call_handler(struct batadv_priv
*bat_priv
,
841 struct batadv_tvlv_handler
*tvlv_handler
,
843 struct batadv_orig_node
*orig_node
,
844 uint8_t *src
, uint8_t *dst
,
845 void *tvlv_value
, uint16_t tvlv_value_len
)
848 return NET_RX_SUCCESS
;
851 if (!tvlv_handler
->ogm_handler
)
852 return NET_RX_SUCCESS
;
855 return NET_RX_SUCCESS
;
857 tvlv_handler
->ogm_handler(bat_priv
, orig_node
,
859 tvlv_value
, tvlv_value_len
);
860 tvlv_handler
->flags
|= BATADV_TVLV_HANDLER_OGM_CALLED
;
863 return NET_RX_SUCCESS
;
866 return NET_RX_SUCCESS
;
868 if (!tvlv_handler
->unicast_handler
)
869 return NET_RX_SUCCESS
;
871 return tvlv_handler
->unicast_handler(bat_priv
, src
,
876 return NET_RX_SUCCESS
;
880 * batadv_tvlv_containers_process - parse the given tvlv buffer to call the
881 * appropriate handlers
882 * @bat_priv: the bat priv with all the soft interface information
883 * @ogm_source: flag indicating wether the tvlv is an ogm or a unicast packet
884 * @orig_node: orig node emitting the ogm packet
885 * @src: source mac address of the unicast packet
886 * @dst: destination mac address of the unicast packet
887 * @tvlv_value: tvlv content
888 * @tvlv_value_len: tvlv content length
890 * Returns success when processing an OGM or the return value of all called
893 int batadv_tvlv_containers_process(struct batadv_priv
*bat_priv
,
895 struct batadv_orig_node
*orig_node
,
896 uint8_t *src
, uint8_t *dst
,
897 void *tvlv_value
, uint16_t tvlv_value_len
)
899 struct batadv_tvlv_handler
*tvlv_handler
;
900 struct batadv_tvlv_hdr
*tvlv_hdr
;
901 uint16_t tvlv_value_cont_len
;
902 uint8_t cifnotfound
= BATADV_TVLV_HANDLER_OGM_CIFNOTFND
;
903 int ret
= NET_RX_SUCCESS
;
905 while (tvlv_value_len
>= sizeof(*tvlv_hdr
)) {
906 tvlv_hdr
= tvlv_value
;
907 tvlv_value_cont_len
= ntohs(tvlv_hdr
->len
);
908 tvlv_value
= tvlv_hdr
+ 1;
909 tvlv_value_len
-= sizeof(*tvlv_hdr
);
911 if (tvlv_value_cont_len
> tvlv_value_len
)
914 tvlv_handler
= batadv_tvlv_handler_get(bat_priv
,
918 ret
|= batadv_tvlv_call_handler(bat_priv
, tvlv_handler
,
919 ogm_source
, orig_node
,
920 src
, dst
, tvlv_value
,
921 tvlv_value_cont_len
);
923 batadv_tvlv_handler_free_ref(tvlv_handler
);
924 tvlv_value
= (uint8_t *)tvlv_value
+ tvlv_value_cont_len
;
925 tvlv_value_len
-= tvlv_value_cont_len
;
932 hlist_for_each_entry_rcu(tvlv_handler
,
933 &bat_priv
->tvlv
.handler_list
, list
) {
934 if ((tvlv_handler
->flags
& BATADV_TVLV_HANDLER_OGM_CIFNOTFND
) &&
935 !(tvlv_handler
->flags
& BATADV_TVLV_HANDLER_OGM_CALLED
))
936 tvlv_handler
->ogm_handler(bat_priv
, orig_node
,
937 cifnotfound
, NULL
, 0);
939 tvlv_handler
->flags
&= ~BATADV_TVLV_HANDLER_OGM_CALLED
;
943 return NET_RX_SUCCESS
;
947 * batadv_tvlv_ogm_receive - process an incoming ogm and call the appropriate
949 * @bat_priv: the bat priv with all the soft interface information
950 * @batadv_ogm_packet: ogm packet containing the tvlv containers
951 * @orig_node: orig node emitting the ogm packet
953 void batadv_tvlv_ogm_receive(struct batadv_priv
*bat_priv
,
954 struct batadv_ogm_packet
*batadv_ogm_packet
,
955 struct batadv_orig_node
*orig_node
)
958 uint16_t tvlv_value_len
;
960 if (!batadv_ogm_packet
)
963 tvlv_value_len
= ntohs(batadv_ogm_packet
->tvlv_len
);
967 tvlv_value
= batadv_ogm_packet
+ 1;
969 batadv_tvlv_containers_process(bat_priv
, true, orig_node
, NULL
, NULL
,
970 tvlv_value
, tvlv_value_len
);
974 * batadv_tvlv_handler_register - register tvlv handler based on the provided
975 * type and version (both need to match) for ogm tvlv payload and/or unicast
977 * @bat_priv: the bat priv with all the soft interface information
978 * @optr: ogm tvlv handler callback function. This function receives the orig
979 * node, flags and the tvlv content as argument to process.
980 * @uptr: unicast tvlv handler callback function. This function receives the
981 * source & destination of the unicast packet as well as the tvlv content
983 * @type: tvlv handler type to be registered
984 * @version: tvlv handler version to be registered
985 * @flags: flags to enable or disable TVLV API behavior
987 void batadv_tvlv_handler_register(struct batadv_priv
*bat_priv
,
988 void (*optr
)(struct batadv_priv
*bat_priv
,
989 struct batadv_orig_node
*orig
,
992 uint16_t tvlv_value_len
),
993 int (*uptr
)(struct batadv_priv
*bat_priv
,
994 uint8_t *src
, uint8_t *dst
,
996 uint16_t tvlv_value_len
),
997 uint8_t type
, uint8_t version
, uint8_t flags
)
999 struct batadv_tvlv_handler
*tvlv_handler
;
1001 tvlv_handler
= batadv_tvlv_handler_get(bat_priv
, type
, version
);
1003 batadv_tvlv_handler_free_ref(tvlv_handler
);
1007 tvlv_handler
= kzalloc(sizeof(*tvlv_handler
), GFP_ATOMIC
);
1011 tvlv_handler
->ogm_handler
= optr
;
1012 tvlv_handler
->unicast_handler
= uptr
;
1013 tvlv_handler
->type
= type
;
1014 tvlv_handler
->version
= version
;
1015 tvlv_handler
->flags
= flags
;
1016 atomic_set(&tvlv_handler
->refcount
, 1);
1017 INIT_HLIST_NODE(&tvlv_handler
->list
);
1019 spin_lock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1020 hlist_add_head_rcu(&tvlv_handler
->list
, &bat_priv
->tvlv
.handler_list
);
1021 spin_unlock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1025 * batadv_tvlv_handler_unregister - unregister tvlv handler based on the
1026 * provided type and version (both need to match)
1027 * @bat_priv: the bat priv with all the soft interface information
1028 * @type: tvlv handler type to be unregistered
1029 * @version: tvlv handler version to be unregistered
1031 void batadv_tvlv_handler_unregister(struct batadv_priv
*bat_priv
,
1032 uint8_t type
, uint8_t version
)
1034 struct batadv_tvlv_handler
*tvlv_handler
;
1036 tvlv_handler
= batadv_tvlv_handler_get(bat_priv
, type
, version
);
1040 batadv_tvlv_handler_free_ref(tvlv_handler
);
1041 spin_lock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1042 hlist_del_rcu(&tvlv_handler
->list
);
1043 spin_unlock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1044 batadv_tvlv_handler_free_ref(tvlv_handler
);
1048 * batadv_tvlv_unicast_send - send a unicast packet with tvlv payload to the
1050 * @bat_priv: the bat priv with all the soft interface information
1051 * @src: source mac address of the unicast packet
1052 * @dst: destination mac address of the unicast packet
1054 * @version: tvlv version
1055 * @tvlv_value: tvlv content
1056 * @tvlv_value_len: tvlv content length
1058 void batadv_tvlv_unicast_send(struct batadv_priv
*bat_priv
, uint8_t *src
,
1059 uint8_t *dst
, uint8_t type
, uint8_t version
,
1060 void *tvlv_value
, uint16_t tvlv_value_len
)
1062 struct batadv_unicast_tvlv_packet
*unicast_tvlv_packet
;
1063 struct batadv_tvlv_hdr
*tvlv_hdr
;
1064 struct batadv_orig_node
*orig_node
;
1065 struct sk_buff
*skb
= NULL
;
1066 unsigned char *tvlv_buff
;
1067 unsigned int tvlv_len
;
1068 ssize_t hdr_len
= sizeof(*unicast_tvlv_packet
);
1071 orig_node
= batadv_orig_hash_find(bat_priv
, dst
);
1075 tvlv_len
= sizeof(*tvlv_hdr
) + tvlv_value_len
;
1077 skb
= netdev_alloc_skb_ip_align(NULL
, ETH_HLEN
+ hdr_len
+ tvlv_len
);
1081 skb
->priority
= TC_PRIO_CONTROL
;
1082 skb_reserve(skb
, ETH_HLEN
);
1083 tvlv_buff
= skb_put(skb
, sizeof(*unicast_tvlv_packet
) + tvlv_len
);
1084 unicast_tvlv_packet
= (struct batadv_unicast_tvlv_packet
*)tvlv_buff
;
1085 unicast_tvlv_packet
->header
.packet_type
= BATADV_UNICAST_TVLV
;
1086 unicast_tvlv_packet
->header
.version
= BATADV_COMPAT_VERSION
;
1087 unicast_tvlv_packet
->header
.ttl
= BATADV_TTL
;
1088 unicast_tvlv_packet
->reserved
= 0;
1089 unicast_tvlv_packet
->tvlv_len
= htons(tvlv_len
);
1090 unicast_tvlv_packet
->align
= 0;
1091 memcpy(unicast_tvlv_packet
->src
, src
, ETH_ALEN
);
1092 memcpy(unicast_tvlv_packet
->dst
, dst
, ETH_ALEN
);
1094 tvlv_buff
= (unsigned char *)(unicast_tvlv_packet
+ 1);
1095 tvlv_hdr
= (struct batadv_tvlv_hdr
*)tvlv_buff
;
1096 tvlv_hdr
->version
= version
;
1097 tvlv_hdr
->type
= type
;
1098 tvlv_hdr
->len
= htons(tvlv_value_len
);
1099 tvlv_buff
+= sizeof(*tvlv_hdr
);
1100 memcpy(tvlv_buff
, tvlv_value
, tvlv_value_len
);
1102 if (batadv_send_skb_to_orig(skb
, orig_node
, NULL
) != NET_XMIT_DROP
)
1109 batadv_orig_node_free_ref(orig_node
);
1112 static int batadv_param_set_ra(const char *val
, const struct kernel_param
*kp
)
1114 struct batadv_algo_ops
*bat_algo_ops
;
1115 char *algo_name
= (char *)val
;
1116 size_t name_len
= strlen(algo_name
);
1118 if (name_len
> 0 && algo_name
[name_len
- 1] == '\n')
1119 algo_name
[name_len
- 1] = '\0';
1121 bat_algo_ops
= batadv_algo_get(algo_name
);
1122 if (!bat_algo_ops
) {
1123 pr_err("Routing algorithm '%s' is not supported\n", algo_name
);
1127 return param_set_copystring(algo_name
, kp
);
1130 static const struct kernel_param_ops batadv_param_ops_ra
= {
1131 .set
= batadv_param_set_ra
,
1132 .get
= param_get_string
,
1135 static struct kparam_string batadv_param_string_ra
= {
1136 .maxlen
= sizeof(batadv_routing_algo
),
1137 .string
= batadv_routing_algo
,
1140 module_param_cb(routing_algo
, &batadv_param_ops_ra
, &batadv_param_string_ra
,
1142 module_init(batadv_init
);
1143 module_exit(batadv_exit
);
1145 MODULE_LICENSE("GPL");
1147 MODULE_AUTHOR(BATADV_DRIVER_AUTHOR
);
1148 MODULE_DESCRIPTION(BATADV_DRIVER_DESC
);
1149 MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE
);
1150 MODULE_VERSION(BATADV_SOURCE_VERSION
);