1 /* Copyright (C) 2007-2016 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/>.
20 #include <linux/atomic.h>
21 #include <linux/bug.h>
22 #include <linux/byteorder/generic.h>
23 #include <linux/crc32c.h>
24 #include <linux/errno.h>
26 #include <linux/if_ether.h>
27 #include <linux/if_vlan.h>
28 #include <linux/init.h>
30 #include <linux/ipv6.h>
31 #include <linux/kernel.h>
32 #include <linux/kref.h>
33 #include <linux/list.h>
34 #include <linux/lockdep.h>
35 #include <linux/module.h>
36 #include <linux/moduleparam.h>
37 #include <linux/netdevice.h>
38 #include <linux/pkt_sched.h>
39 #include <linux/rculist.h>
40 #include <linux/rcupdate.h>
41 #include <linux/seq_file.h>
42 #include <linux/skbuff.h>
43 #include <linux/slab.h>
44 #include <linux/spinlock.h>
45 #include <linux/stddef.h>
46 #include <linux/string.h>
47 #include <linux/workqueue.h>
48 #include <net/dsfield.h>
49 #include <net/rtnetlink.h>
52 #include "bridge_loop_avoidance.h"
54 #include "distributed-arp-table.h"
55 #include "gateway_client.h"
56 #include "gateway_common.h"
57 #include "hard-interface.h"
58 #include "icmp_socket.h"
59 #include "multicast.h"
60 #include "network-coding.h"
61 #include "originator.h"
65 #include "soft-interface.h"
66 #include "translation-table.h"
68 /* List manipulations on hardif_list have to be rtnl_lock()'ed,
69 * list traversals just rcu-locked
71 struct list_head batadv_hardif_list
;
72 static int (*batadv_rx_handler
[256])(struct sk_buff
*,
73 struct batadv_hard_iface
*);
74 char batadv_routing_algo
[20] = "BATMAN_IV";
75 static struct hlist_head batadv_algo_list
;
77 unsigned char batadv_broadcast_addr
[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
79 struct workqueue_struct
*batadv_event_workqueue
;
81 static void batadv_recv_handler_init(void);
83 static int __init
batadv_init(void)
85 INIT_LIST_HEAD(&batadv_hardif_list
);
86 INIT_HLIST_HEAD(&batadv_algo_list
);
88 batadv_recv_handler_init();
93 batadv_event_workqueue
= create_singlethread_workqueue("bat_events");
95 if (!batadv_event_workqueue
)
99 batadv_debugfs_init();
101 register_netdevice_notifier(&batadv_hard_if_notifier
);
102 rtnl_link_register(&batadv_link_ops
);
104 pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n",
105 BATADV_SOURCE_VERSION
, BATADV_COMPAT_VERSION
);
110 static void __exit
batadv_exit(void)
112 batadv_debugfs_destroy();
113 rtnl_link_unregister(&batadv_link_ops
);
114 unregister_netdevice_notifier(&batadv_hard_if_notifier
);
115 batadv_hardif_remove_interfaces();
117 flush_workqueue(batadv_event_workqueue
);
118 destroy_workqueue(batadv_event_workqueue
);
119 batadv_event_workqueue
= NULL
;
124 int batadv_mesh_init(struct net_device
*soft_iface
)
126 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
129 spin_lock_init(&bat_priv
->forw_bat_list_lock
);
130 spin_lock_init(&bat_priv
->forw_bcast_list_lock
);
131 spin_lock_init(&bat_priv
->tt
.changes_list_lock
);
132 spin_lock_init(&bat_priv
->tt
.req_list_lock
);
133 spin_lock_init(&bat_priv
->tt
.roam_list_lock
);
134 spin_lock_init(&bat_priv
->tt
.last_changeset_lock
);
135 spin_lock_init(&bat_priv
->tt
.commit_lock
);
136 spin_lock_init(&bat_priv
->gw
.list_lock
);
137 #ifdef CONFIG_BATMAN_ADV_MCAST
138 spin_lock_init(&bat_priv
->mcast
.want_lists_lock
);
140 spin_lock_init(&bat_priv
->tvlv
.container_list_lock
);
141 spin_lock_init(&bat_priv
->tvlv
.handler_list_lock
);
142 spin_lock_init(&bat_priv
->softif_vlan_list_lock
);
144 INIT_HLIST_HEAD(&bat_priv
->forw_bat_list
);
145 INIT_HLIST_HEAD(&bat_priv
->forw_bcast_list
);
146 INIT_HLIST_HEAD(&bat_priv
->gw
.list
);
147 #ifdef CONFIG_BATMAN_ADV_MCAST
148 INIT_HLIST_HEAD(&bat_priv
->mcast
.want_all_unsnoopables_list
);
149 INIT_HLIST_HEAD(&bat_priv
->mcast
.want_all_ipv4_list
);
150 INIT_HLIST_HEAD(&bat_priv
->mcast
.want_all_ipv6_list
);
152 INIT_LIST_HEAD(&bat_priv
->tt
.changes_list
);
153 INIT_HLIST_HEAD(&bat_priv
->tt
.req_list
);
154 INIT_LIST_HEAD(&bat_priv
->tt
.roam_list
);
155 #ifdef CONFIG_BATMAN_ADV_MCAST
156 INIT_HLIST_HEAD(&bat_priv
->mcast
.mla_list
);
158 INIT_HLIST_HEAD(&bat_priv
->tvlv
.container_list
);
159 INIT_HLIST_HEAD(&bat_priv
->tvlv
.handler_list
);
160 INIT_HLIST_HEAD(&bat_priv
->softif_vlan_list
);
162 ret
= batadv_originator_init(bat_priv
);
166 ret
= batadv_tt_init(bat_priv
);
170 ret
= batadv_bla_init(bat_priv
);
174 ret
= batadv_dat_init(bat_priv
);
178 ret
= batadv_nc_mesh_init(bat_priv
);
182 batadv_gw_init(bat_priv
);
183 batadv_mcast_init(bat_priv
);
185 atomic_set(&bat_priv
->gw
.reselect
, 0);
186 atomic_set(&bat_priv
->mesh_state
, BATADV_MESH_ACTIVE
);
191 batadv_mesh_free(soft_iface
);
195 void batadv_mesh_free(struct net_device
*soft_iface
)
197 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
199 atomic_set(&bat_priv
->mesh_state
, BATADV_MESH_DEACTIVATING
);
201 batadv_purge_outstanding_packets(bat_priv
, NULL
);
203 batadv_gw_node_free(bat_priv
);
204 batadv_nc_mesh_free(bat_priv
);
205 batadv_dat_free(bat_priv
);
206 batadv_bla_free(bat_priv
);
208 batadv_mcast_free(bat_priv
);
210 /* Free the TT and the originator tables only after having terminated
211 * all the other depending components which may use these structures for
214 batadv_tt_free(bat_priv
);
216 /* Since the originator table clean up routine is accessing the TT
217 * tables as well, it has to be invoked after the TT tables have been
218 * freed and marked as empty. This ensures that no cleanup RCU callbacks
219 * accessing the TT data are scheduled for later execution.
221 batadv_originator_free(bat_priv
);
223 batadv_gw_free(bat_priv
);
225 free_percpu(bat_priv
->bat_counters
);
226 bat_priv
->bat_counters
= NULL
;
228 atomic_set(&bat_priv
->mesh_state
, BATADV_MESH_INACTIVE
);
232 * batadv_is_my_mac - check if the given mac address belongs to any of the real
233 * interfaces in the current mesh
234 * @bat_priv: the bat priv with all the soft interface information
235 * @addr: the address to check
237 * Return: 'true' if the mac address was found, false otherwise.
239 bool batadv_is_my_mac(struct batadv_priv
*bat_priv
, const u8
*addr
)
241 const struct batadv_hard_iface
*hard_iface
;
242 bool is_my_mac
= false;
245 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
246 if (hard_iface
->if_status
!= BATADV_IF_ACTIVE
)
249 if (hard_iface
->soft_iface
!= bat_priv
->soft_iface
)
252 if (batadv_compare_eth(hard_iface
->net_dev
->dev_addr
, addr
)) {
262 * batadv_seq_print_text_primary_if_get - called from debugfs table printing
263 * function that requires the primary interface
264 * @seq: debugfs table seq_file struct
266 * Return: primary interface if found or NULL otherwise.
268 struct batadv_hard_iface
*
269 batadv_seq_print_text_primary_if_get(struct seq_file
*seq
)
271 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
272 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
273 struct batadv_hard_iface
*primary_if
;
275 primary_if
= batadv_primary_if_get_selected(bat_priv
);
279 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
284 if (primary_if
->if_status
== BATADV_IF_ACTIVE
)
288 "BATMAN mesh %s disabled - primary interface not active\n",
290 batadv_hardif_free_ref(primary_if
);
298 * batadv_max_header_len - calculate maximum encapsulation overhead for a
301 * Return: the maximum encapsulation overhead in bytes.
303 int batadv_max_header_len(void)
307 header_len
= max_t(int, header_len
,
308 sizeof(struct batadv_unicast_packet
));
309 header_len
= max_t(int, header_len
,
310 sizeof(struct batadv_unicast_4addr_packet
));
311 header_len
= max_t(int, header_len
,
312 sizeof(struct batadv_bcast_packet
));
314 #ifdef CONFIG_BATMAN_ADV_NC
315 header_len
= max_t(int, header_len
,
316 sizeof(struct batadv_coded_packet
));
319 return header_len
+ ETH_HLEN
;
323 * batadv_skb_set_priority - sets skb priority according to packet content
324 * @skb: the packet to be sent
325 * @offset: offset to the packet content
327 * This function sets a value between 256 and 263 (802.1d priority), which
328 * can be interpreted by the cfg80211 or other drivers.
330 void batadv_skb_set_priority(struct sk_buff
*skb
, int offset
)
332 struct iphdr ip_hdr_tmp
, *ip_hdr
;
333 struct ipv6hdr ip6_hdr_tmp
, *ip6_hdr
;
334 struct ethhdr ethhdr_tmp
, *ethhdr
;
335 struct vlan_ethhdr
*vhdr
, vhdr_tmp
;
338 /* already set, do nothing */
339 if (skb
->priority
>= 256 && skb
->priority
<= 263)
342 ethhdr
= skb_header_pointer(skb
, offset
, sizeof(*ethhdr
), ðhdr_tmp
);
346 switch (ethhdr
->h_proto
) {
347 case htons(ETH_P_8021Q
):
348 vhdr
= skb_header_pointer(skb
, offset
+ sizeof(*vhdr
),
349 sizeof(*vhdr
), &vhdr_tmp
);
352 prio
= ntohs(vhdr
->h_vlan_TCI
) & VLAN_PRIO_MASK
;
353 prio
= prio
>> VLAN_PRIO_SHIFT
;
355 case htons(ETH_P_IP
):
356 ip_hdr
= skb_header_pointer(skb
, offset
+ sizeof(*ethhdr
),
357 sizeof(*ip_hdr
), &ip_hdr_tmp
);
360 prio
= (ipv4_get_dsfield(ip_hdr
) & 0xfc) >> 5;
362 case htons(ETH_P_IPV6
):
363 ip6_hdr
= skb_header_pointer(skb
, offset
+ sizeof(*ethhdr
),
364 sizeof(*ip6_hdr
), &ip6_hdr_tmp
);
367 prio
= (ipv6_get_dsfield(ip6_hdr
) & 0xfc) >> 5;
373 skb
->priority
= prio
+ 256;
376 static int batadv_recv_unhandled_packet(struct sk_buff
*skb
,
377 struct batadv_hard_iface
*recv_if
)
382 /* incoming packets with the batman ethertype received on any active hard
385 int batadv_batman_skb_recv(struct sk_buff
*skb
, struct net_device
*dev
,
386 struct packet_type
*ptype
,
387 struct net_device
*orig_dev
)
389 struct batadv_priv
*bat_priv
;
390 struct batadv_ogm_packet
*batadv_ogm_packet
;
391 struct batadv_hard_iface
*hard_iface
;
395 hard_iface
= container_of(ptype
, struct batadv_hard_iface
,
397 skb
= skb_share_check(skb
, GFP_ATOMIC
);
399 /* skb was released by skb_share_check() */
403 /* packet should hold at least type and version */
404 if (unlikely(!pskb_may_pull(skb
, 2)))
407 /* expect a valid ethernet header here. */
408 if (unlikely(skb
->mac_len
!= ETH_HLEN
|| !skb_mac_header(skb
)))
411 if (!hard_iface
->soft_iface
)
414 bat_priv
= netdev_priv(hard_iface
->soft_iface
);
416 if (atomic_read(&bat_priv
->mesh_state
) != BATADV_MESH_ACTIVE
)
419 /* discard frames on not active interfaces */
420 if (hard_iface
->if_status
!= BATADV_IF_ACTIVE
)
423 batadv_ogm_packet
= (struct batadv_ogm_packet
*)skb
->data
;
425 if (batadv_ogm_packet
->version
!= BATADV_COMPAT_VERSION
) {
426 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
427 "Drop packet: incompatible batman version (%i)\n",
428 batadv_ogm_packet
->version
);
432 /* reset control block to avoid left overs from previous users */
433 memset(skb
->cb
, 0, sizeof(struct batadv_skb_cb
));
435 /* all receive handlers return whether they received or reused
436 * the supplied skb. if not, we have to free the skb.
438 idx
= batadv_ogm_packet
->packet_type
;
439 ret
= (*batadv_rx_handler
[idx
])(skb
, hard_iface
);
441 if (ret
== NET_RX_DROP
)
444 /* return NET_RX_SUCCESS in any case as we
445 * most probably dropped the packet for
446 * routing-logical reasons.
448 return NET_RX_SUCCESS
;
456 static void batadv_recv_handler_init(void)
460 for (i
= 0; i
< ARRAY_SIZE(batadv_rx_handler
); i
++)
461 batadv_rx_handler
[i
] = batadv_recv_unhandled_packet
;
463 for (i
= BATADV_UNICAST_MIN
; i
<= BATADV_UNICAST_MAX
; i
++)
464 batadv_rx_handler
[i
] = batadv_recv_unhandled_unicast_packet
;
466 /* compile time checks for sizes */
467 BUILD_BUG_ON(sizeof(struct batadv_bla_claim_dst
) != 6);
468 BUILD_BUG_ON(sizeof(struct batadv_ogm_packet
) != 24);
469 BUILD_BUG_ON(sizeof(struct batadv_icmp_header
) != 20);
470 BUILD_BUG_ON(sizeof(struct batadv_icmp_packet
) != 20);
471 BUILD_BUG_ON(sizeof(struct batadv_icmp_packet_rr
) != 116);
472 BUILD_BUG_ON(sizeof(struct batadv_unicast_packet
) != 10);
473 BUILD_BUG_ON(sizeof(struct batadv_unicast_4addr_packet
) != 18);
474 BUILD_BUG_ON(sizeof(struct batadv_frag_packet
) != 20);
475 BUILD_BUG_ON(sizeof(struct batadv_bcast_packet
) != 14);
476 BUILD_BUG_ON(sizeof(struct batadv_coded_packet
) != 46);
477 BUILD_BUG_ON(sizeof(struct batadv_unicast_tvlv_packet
) != 20);
478 BUILD_BUG_ON(sizeof(struct batadv_tvlv_hdr
) != 4);
479 BUILD_BUG_ON(sizeof(struct batadv_tvlv_gateway_data
) != 8);
480 BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_vlan_data
) != 8);
481 BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_change
) != 12);
482 BUILD_BUG_ON(sizeof(struct batadv_tvlv_roam_adv
) != 8);
484 /* broadcast packet */
485 batadv_rx_handler
[BATADV_BCAST
] = batadv_recv_bcast_packet
;
487 /* unicast packets ... */
488 /* unicast with 4 addresses packet */
489 batadv_rx_handler
[BATADV_UNICAST_4ADDR
] = batadv_recv_unicast_packet
;
491 batadv_rx_handler
[BATADV_UNICAST
] = batadv_recv_unicast_packet
;
492 /* unicast tvlv packet */
493 batadv_rx_handler
[BATADV_UNICAST_TVLV
] = batadv_recv_unicast_tvlv
;
494 /* batman icmp packet */
495 batadv_rx_handler
[BATADV_ICMP
] = batadv_recv_icmp_packet
;
496 /* Fragmented packets */
497 batadv_rx_handler
[BATADV_UNICAST_FRAG
] = batadv_recv_frag_packet
;
501 batadv_recv_handler_register(u8 packet_type
,
502 int (*recv_handler
)(struct sk_buff
*,
503 struct batadv_hard_iface
*))
505 int (*curr
)(struct sk_buff
*,
506 struct batadv_hard_iface
*);
507 curr
= batadv_rx_handler
[packet_type
];
509 if ((curr
!= batadv_recv_unhandled_packet
) &&
510 (curr
!= batadv_recv_unhandled_unicast_packet
))
513 batadv_rx_handler
[packet_type
] = recv_handler
;
517 void batadv_recv_handler_unregister(u8 packet_type
)
519 batadv_rx_handler
[packet_type
] = batadv_recv_unhandled_packet
;
522 static struct batadv_algo_ops
*batadv_algo_get(char *name
)
524 struct batadv_algo_ops
*bat_algo_ops
= NULL
, *bat_algo_ops_tmp
;
526 hlist_for_each_entry(bat_algo_ops_tmp
, &batadv_algo_list
, list
) {
527 if (strcmp(bat_algo_ops_tmp
->name
, name
) != 0)
530 bat_algo_ops
= bat_algo_ops_tmp
;
537 int batadv_algo_register(struct batadv_algo_ops
*bat_algo_ops
)
539 struct batadv_algo_ops
*bat_algo_ops_tmp
;
541 bat_algo_ops_tmp
= batadv_algo_get(bat_algo_ops
->name
);
542 if (bat_algo_ops_tmp
) {
543 pr_info("Trying to register already registered routing algorithm: %s\n",
548 /* all algorithms must implement all ops (for now) */
549 if (!bat_algo_ops
->bat_iface_enable
||
550 !bat_algo_ops
->bat_iface_disable
||
551 !bat_algo_ops
->bat_iface_update_mac
||
552 !bat_algo_ops
->bat_primary_iface_set
||
553 !bat_algo_ops
->bat_ogm_schedule
||
554 !bat_algo_ops
->bat_ogm_emit
||
555 !bat_algo_ops
->bat_neigh_cmp
||
556 !bat_algo_ops
->bat_neigh_is_similar_or_better
) {
557 pr_info("Routing algo '%s' does not implement required ops\n",
562 INIT_HLIST_NODE(&bat_algo_ops
->list
);
563 hlist_add_head(&bat_algo_ops
->list
, &batadv_algo_list
);
568 int batadv_algo_select(struct batadv_priv
*bat_priv
, char *name
)
570 struct batadv_algo_ops
*bat_algo_ops
;
572 bat_algo_ops
= batadv_algo_get(name
);
576 bat_priv
->bat_algo_ops
= bat_algo_ops
;
581 int batadv_algo_seq_print_text(struct seq_file
*seq
, void *offset
)
583 struct batadv_algo_ops
*bat_algo_ops
;
585 seq_puts(seq
, "Available routing algorithms:\n");
587 hlist_for_each_entry(bat_algo_ops
, &batadv_algo_list
, list
) {
588 seq_printf(seq
, " * %s\n", bat_algo_ops
->name
);
595 * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in
597 * @skb: skb pointing to fragmented socket buffers
598 * @payload_ptr: Pointer to position inside the head buffer of the skb
599 * marking the start of the data to be CRC'ed
601 * payload_ptr must always point to an address in the skb head buffer and not to
604 * Return: big endian crc32c of the checksummed data
606 __be32
batadv_skb_crc32(struct sk_buff
*skb
, u8
*payload_ptr
)
610 unsigned int to
= skb
->len
;
611 struct skb_seq_state st
;
614 unsigned int consumed
= 0;
616 from
= (unsigned int)(payload_ptr
- skb
->data
);
618 skb_prepare_seq_read(skb
, from
, to
, &st
);
619 while ((len
= skb_seq_read(consumed
, &data
, &st
)) != 0) {
620 crc
= crc32c(crc
, data
, len
);
628 * batadv_tvlv_handler_release - release tvlv handler from lists and queue for
629 * free after rcu grace period
630 * @ref: kref pointer of the tvlv
632 static void batadv_tvlv_handler_release(struct kref
*ref
)
634 struct batadv_tvlv_handler
*tvlv_handler
;
636 tvlv_handler
= container_of(ref
, struct batadv_tvlv_handler
, refcount
);
637 kfree_rcu(tvlv_handler
, rcu
);
641 * batadv_tvlv_handler_free_ref - decrement the tvlv container refcounter and
642 * possibly release it
643 * @tvlv_handler: the tvlv handler to free
646 batadv_tvlv_handler_free_ref(struct batadv_tvlv_handler
*tvlv_handler
)
648 kref_put(&tvlv_handler
->refcount
, batadv_tvlv_handler_release
);
652 * batadv_tvlv_handler_get - retrieve tvlv handler from the tvlv handler list
653 * based on the provided type and version (both need to match)
654 * @bat_priv: the bat priv with all the soft interface information
655 * @type: tvlv handler type to look for
656 * @version: tvlv handler version to look for
658 * Return: tvlv handler if found or NULL otherwise.
660 static struct batadv_tvlv_handler
661 *batadv_tvlv_handler_get(struct batadv_priv
*bat_priv
, u8 type
, u8 version
)
663 struct batadv_tvlv_handler
*tvlv_handler_tmp
, *tvlv_handler
= NULL
;
666 hlist_for_each_entry_rcu(tvlv_handler_tmp
,
667 &bat_priv
->tvlv
.handler_list
, list
) {
668 if (tvlv_handler_tmp
->type
!= type
)
671 if (tvlv_handler_tmp
->version
!= version
)
674 if (!kref_get_unless_zero(&tvlv_handler_tmp
->refcount
))
677 tvlv_handler
= tvlv_handler_tmp
;
686 * batadv_tvlv_container_release - release tvlv from lists and free
687 * @ref: kref pointer of the tvlv
689 static void batadv_tvlv_container_release(struct kref
*ref
)
691 struct batadv_tvlv_container
*tvlv
;
693 tvlv
= container_of(ref
, struct batadv_tvlv_container
, refcount
);
698 * batadv_tvlv_container_free_ref - decrement the tvlv container refcounter and
699 * possibly release it
700 * @tvlv: the tvlv container to free
702 static void batadv_tvlv_container_free_ref(struct batadv_tvlv_container
*tvlv
)
704 kref_put(&tvlv
->refcount
, batadv_tvlv_container_release
);
708 * batadv_tvlv_container_get - retrieve tvlv container from the tvlv container
709 * list based on the provided type and version (both need to match)
710 * @bat_priv: the bat priv with all the soft interface information
711 * @type: tvlv container type to look for
712 * @version: tvlv container version to look for
714 * Has to be called with the appropriate locks being acquired
715 * (tvlv.container_list_lock).
717 * Return: tvlv container if found or NULL otherwise.
719 static struct batadv_tvlv_container
720 *batadv_tvlv_container_get(struct batadv_priv
*bat_priv
, u8 type
, u8 version
)
722 struct batadv_tvlv_container
*tvlv_tmp
, *tvlv
= NULL
;
724 lockdep_assert_held(&bat_priv
->tvlv
.container_list_lock
);
726 hlist_for_each_entry(tvlv_tmp
, &bat_priv
->tvlv
.container_list
, list
) {
727 if (tvlv_tmp
->tvlv_hdr
.type
!= type
)
730 if (tvlv_tmp
->tvlv_hdr
.version
!= version
)
733 if (!kref_get_unless_zero(&tvlv_tmp
->refcount
))
744 * batadv_tvlv_container_list_size - calculate the size of the tvlv container
746 * @bat_priv: the bat priv with all the soft interface information
748 * Has to be called with the appropriate locks being acquired
749 * (tvlv.container_list_lock).
751 * Return: size of all currently registered tvlv containers in bytes.
753 static u16
batadv_tvlv_container_list_size(struct batadv_priv
*bat_priv
)
755 struct batadv_tvlv_container
*tvlv
;
758 lockdep_assert_held(&bat_priv
->tvlv
.container_list_lock
);
760 hlist_for_each_entry(tvlv
, &bat_priv
->tvlv
.container_list
, list
) {
761 tvlv_len
+= sizeof(struct batadv_tvlv_hdr
);
762 tvlv_len
+= ntohs(tvlv
->tvlv_hdr
.len
);
769 * batadv_tvlv_container_remove - remove tvlv container from the tvlv container
771 * @bat_priv: the bat priv with all the soft interface information
772 * @tvlv: the to be removed tvlv container
774 * Has to be called with the appropriate locks being acquired
775 * (tvlv.container_list_lock).
777 static void batadv_tvlv_container_remove(struct batadv_priv
*bat_priv
,
778 struct batadv_tvlv_container
*tvlv
)
780 lockdep_assert_held(&bat_priv
->tvlv
.container_list_lock
);
785 hlist_del(&tvlv
->list
);
787 /* first call to decrement the counter, second call to free */
788 batadv_tvlv_container_free_ref(tvlv
);
789 batadv_tvlv_container_free_ref(tvlv
);
793 * batadv_tvlv_container_unregister - unregister tvlv container based on the
794 * provided type and version (both need to match)
795 * @bat_priv: the bat priv with all the soft interface information
796 * @type: tvlv container type to unregister
797 * @version: tvlv container type to unregister
799 void batadv_tvlv_container_unregister(struct batadv_priv
*bat_priv
,
802 struct batadv_tvlv_container
*tvlv
;
804 spin_lock_bh(&bat_priv
->tvlv
.container_list_lock
);
805 tvlv
= batadv_tvlv_container_get(bat_priv
, type
, version
);
806 batadv_tvlv_container_remove(bat_priv
, tvlv
);
807 spin_unlock_bh(&bat_priv
->tvlv
.container_list_lock
);
811 * batadv_tvlv_container_register - register tvlv type, version and content
812 * to be propagated with each (primary interface) OGM
813 * @bat_priv: the bat priv with all the soft interface information
814 * @type: tvlv container type
815 * @version: tvlv container version
816 * @tvlv_value: tvlv container content
817 * @tvlv_value_len: tvlv container content length
819 * If a container of the same type and version was already registered the new
820 * content is going to replace the old one.
822 void batadv_tvlv_container_register(struct batadv_priv
*bat_priv
,
824 void *tvlv_value
, u16 tvlv_value_len
)
826 struct batadv_tvlv_container
*tvlv_old
, *tvlv_new
;
831 tvlv_new
= kzalloc(sizeof(*tvlv_new
) + tvlv_value_len
, GFP_ATOMIC
);
835 tvlv_new
->tvlv_hdr
.version
= version
;
836 tvlv_new
->tvlv_hdr
.type
= type
;
837 tvlv_new
->tvlv_hdr
.len
= htons(tvlv_value_len
);
839 memcpy(tvlv_new
+ 1, tvlv_value
, ntohs(tvlv_new
->tvlv_hdr
.len
));
840 INIT_HLIST_NODE(&tvlv_new
->list
);
841 kref_init(&tvlv_new
->refcount
);
843 spin_lock_bh(&bat_priv
->tvlv
.container_list_lock
);
844 tvlv_old
= batadv_tvlv_container_get(bat_priv
, type
, version
);
845 batadv_tvlv_container_remove(bat_priv
, tvlv_old
);
846 hlist_add_head(&tvlv_new
->list
, &bat_priv
->tvlv
.container_list
);
847 spin_unlock_bh(&bat_priv
->tvlv
.container_list_lock
);
851 * batadv_tvlv_realloc_packet_buff - reallocate packet buffer to accommodate
852 * requested packet size
853 * @packet_buff: packet buffer
854 * @packet_buff_len: packet buffer size
855 * @min_packet_len: requested packet minimum size
856 * @additional_packet_len: requested additional packet size on top of minimum
859 * Return: true of the packet buffer could be changed to the requested size,
862 static bool batadv_tvlv_realloc_packet_buff(unsigned char **packet_buff
,
863 int *packet_buff_len
,
865 int additional_packet_len
)
867 unsigned char *new_buff
;
869 new_buff
= kmalloc(min_packet_len
+ additional_packet_len
, GFP_ATOMIC
);
871 /* keep old buffer if kmalloc should fail */
875 memcpy(new_buff
, *packet_buff
, min_packet_len
);
877 *packet_buff
= new_buff
;
878 *packet_buff_len
= min_packet_len
+ additional_packet_len
;
884 * batadv_tvlv_container_ogm_append - append tvlv container content to given
886 * @bat_priv: the bat priv with all the soft interface information
887 * @packet_buff: ogm packet buffer
888 * @packet_buff_len: ogm packet buffer size including ogm header and tvlv
890 * @packet_min_len: ogm header size to be preserved for the OGM itself
892 * The ogm packet might be enlarged or shrunk depending on the current size
893 * and the size of the to-be-appended tvlv containers.
895 * Return: size of all appended tvlv containers in bytes.
897 u16
batadv_tvlv_container_ogm_append(struct batadv_priv
*bat_priv
,
898 unsigned char **packet_buff
,
899 int *packet_buff_len
, int packet_min_len
)
901 struct batadv_tvlv_container
*tvlv
;
902 struct batadv_tvlv_hdr
*tvlv_hdr
;
907 spin_lock_bh(&bat_priv
->tvlv
.container_list_lock
);
908 tvlv_value_len
= batadv_tvlv_container_list_size(bat_priv
);
910 ret
= batadv_tvlv_realloc_packet_buff(packet_buff
, packet_buff_len
,
911 packet_min_len
, tvlv_value_len
);
919 tvlv_value
= (*packet_buff
) + packet_min_len
;
921 hlist_for_each_entry(tvlv
, &bat_priv
->tvlv
.container_list
, list
) {
922 tvlv_hdr
= tvlv_value
;
923 tvlv_hdr
->type
= tvlv
->tvlv_hdr
.type
;
924 tvlv_hdr
->version
= tvlv
->tvlv_hdr
.version
;
925 tvlv_hdr
->len
= tvlv
->tvlv_hdr
.len
;
926 tvlv_value
= tvlv_hdr
+ 1;
927 memcpy(tvlv_value
, tvlv
+ 1, ntohs(tvlv
->tvlv_hdr
.len
));
928 tvlv_value
= (u8
*)tvlv_value
+ ntohs(tvlv
->tvlv_hdr
.len
);
932 spin_unlock_bh(&bat_priv
->tvlv
.container_list_lock
);
933 return tvlv_value_len
;
937 * batadv_tvlv_call_handler - parse the given tvlv buffer to call the
938 * appropriate handlers
939 * @bat_priv: the bat priv with all the soft interface information
940 * @tvlv_handler: tvlv callback function handling the tvlv content
941 * @ogm_source: flag indicating whether the tvlv is an ogm or a unicast packet
942 * @orig_node: orig node emitting the ogm packet
943 * @src: source mac address of the unicast packet
944 * @dst: destination mac address of the unicast packet
945 * @tvlv_value: tvlv content
946 * @tvlv_value_len: tvlv content length
948 * Return: success if handler was not found or the return value of the handler
951 static int batadv_tvlv_call_handler(struct batadv_priv
*bat_priv
,
952 struct batadv_tvlv_handler
*tvlv_handler
,
954 struct batadv_orig_node
*orig_node
,
956 void *tvlv_value
, u16 tvlv_value_len
)
959 return NET_RX_SUCCESS
;
962 if (!tvlv_handler
->ogm_handler
)
963 return NET_RX_SUCCESS
;
966 return NET_RX_SUCCESS
;
968 tvlv_handler
->ogm_handler(bat_priv
, orig_node
,
970 tvlv_value
, tvlv_value_len
);
971 tvlv_handler
->flags
|= BATADV_TVLV_HANDLER_OGM_CALLED
;
974 return NET_RX_SUCCESS
;
977 return NET_RX_SUCCESS
;
979 if (!tvlv_handler
->unicast_handler
)
980 return NET_RX_SUCCESS
;
982 return tvlv_handler
->unicast_handler(bat_priv
, src
,
987 return NET_RX_SUCCESS
;
991 * batadv_tvlv_containers_process - parse the given tvlv buffer to call the
992 * appropriate handlers
993 * @bat_priv: the bat priv with all the soft interface information
994 * @ogm_source: flag indicating whether the tvlv is an ogm or a unicast packet
995 * @orig_node: orig node emitting the ogm packet
996 * @src: source mac address of the unicast packet
997 * @dst: destination mac address of the unicast packet
998 * @tvlv_value: tvlv content
999 * @tvlv_value_len: tvlv content length
1001 * Return: success when processing an OGM or the return value of all called
1002 * handler callbacks.
1004 int batadv_tvlv_containers_process(struct batadv_priv
*bat_priv
,
1006 struct batadv_orig_node
*orig_node
,
1008 void *tvlv_value
, u16 tvlv_value_len
)
1010 struct batadv_tvlv_handler
*tvlv_handler
;
1011 struct batadv_tvlv_hdr
*tvlv_hdr
;
1012 u16 tvlv_value_cont_len
;
1013 u8 cifnotfound
= BATADV_TVLV_HANDLER_OGM_CIFNOTFND
;
1014 int ret
= NET_RX_SUCCESS
;
1016 while (tvlv_value_len
>= sizeof(*tvlv_hdr
)) {
1017 tvlv_hdr
= tvlv_value
;
1018 tvlv_value_cont_len
= ntohs(tvlv_hdr
->len
);
1019 tvlv_value
= tvlv_hdr
+ 1;
1020 tvlv_value_len
-= sizeof(*tvlv_hdr
);
1022 if (tvlv_value_cont_len
> tvlv_value_len
)
1025 tvlv_handler
= batadv_tvlv_handler_get(bat_priv
,
1029 ret
|= batadv_tvlv_call_handler(bat_priv
, tvlv_handler
,
1030 ogm_source
, orig_node
,
1031 src
, dst
, tvlv_value
,
1032 tvlv_value_cont_len
);
1034 batadv_tvlv_handler_free_ref(tvlv_handler
);
1035 tvlv_value
= (u8
*)tvlv_value
+ tvlv_value_cont_len
;
1036 tvlv_value_len
-= tvlv_value_cont_len
;
1043 hlist_for_each_entry_rcu(tvlv_handler
,
1044 &bat_priv
->tvlv
.handler_list
, list
) {
1045 if ((tvlv_handler
->flags
& BATADV_TVLV_HANDLER_OGM_CIFNOTFND
) &&
1046 !(tvlv_handler
->flags
& BATADV_TVLV_HANDLER_OGM_CALLED
))
1047 tvlv_handler
->ogm_handler(bat_priv
, orig_node
,
1048 cifnotfound
, NULL
, 0);
1050 tvlv_handler
->flags
&= ~BATADV_TVLV_HANDLER_OGM_CALLED
;
1054 return NET_RX_SUCCESS
;
1058 * batadv_tvlv_ogm_receive - process an incoming ogm and call the appropriate
1060 * @bat_priv: the bat priv with all the soft interface information
1061 * @batadv_ogm_packet: ogm packet containing the tvlv containers
1062 * @orig_node: orig node emitting the ogm packet
1064 void batadv_tvlv_ogm_receive(struct batadv_priv
*bat_priv
,
1065 struct batadv_ogm_packet
*batadv_ogm_packet
,
1066 struct batadv_orig_node
*orig_node
)
1071 if (!batadv_ogm_packet
)
1074 tvlv_value_len
= ntohs(batadv_ogm_packet
->tvlv_len
);
1075 if (!tvlv_value_len
)
1078 tvlv_value
= batadv_ogm_packet
+ 1;
1080 batadv_tvlv_containers_process(bat_priv
, true, orig_node
, NULL
, NULL
,
1081 tvlv_value
, tvlv_value_len
);
1085 * batadv_tvlv_handler_register - register tvlv handler based on the provided
1086 * type and version (both need to match) for ogm tvlv payload and/or unicast
1088 * @bat_priv: the bat priv with all the soft interface information
1089 * @optr: ogm tvlv handler callback function. This function receives the orig
1090 * node, flags and the tvlv content as argument to process.
1091 * @uptr: unicast tvlv handler callback function. This function receives the
1092 * source & destination of the unicast packet as well as the tvlv content
1094 * @type: tvlv handler type to be registered
1095 * @version: tvlv handler version to be registered
1096 * @flags: flags to enable or disable TVLV API behavior
1098 void batadv_tvlv_handler_register(struct batadv_priv
*bat_priv
,
1099 void (*optr
)(struct batadv_priv
*bat_priv
,
1100 struct batadv_orig_node
*orig
,
1103 u16 tvlv_value_len
),
1104 int (*uptr
)(struct batadv_priv
*bat_priv
,
1107 u16 tvlv_value_len
),
1108 u8 type
, u8 version
, u8 flags
)
1110 struct batadv_tvlv_handler
*tvlv_handler
;
1112 tvlv_handler
= batadv_tvlv_handler_get(bat_priv
, type
, version
);
1114 batadv_tvlv_handler_free_ref(tvlv_handler
);
1118 tvlv_handler
= kzalloc(sizeof(*tvlv_handler
), GFP_ATOMIC
);
1122 tvlv_handler
->ogm_handler
= optr
;
1123 tvlv_handler
->unicast_handler
= uptr
;
1124 tvlv_handler
->type
= type
;
1125 tvlv_handler
->version
= version
;
1126 tvlv_handler
->flags
= flags
;
1127 kref_init(&tvlv_handler
->refcount
);
1128 INIT_HLIST_NODE(&tvlv_handler
->list
);
1130 spin_lock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1131 hlist_add_head_rcu(&tvlv_handler
->list
, &bat_priv
->tvlv
.handler_list
);
1132 spin_unlock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1136 * batadv_tvlv_handler_unregister - unregister tvlv handler based on the
1137 * provided type and version (both need to match)
1138 * @bat_priv: the bat priv with all the soft interface information
1139 * @type: tvlv handler type to be unregistered
1140 * @version: tvlv handler version to be unregistered
1142 void batadv_tvlv_handler_unregister(struct batadv_priv
*bat_priv
,
1143 u8 type
, u8 version
)
1145 struct batadv_tvlv_handler
*tvlv_handler
;
1147 tvlv_handler
= batadv_tvlv_handler_get(bat_priv
, type
, version
);
1151 batadv_tvlv_handler_free_ref(tvlv_handler
);
1152 spin_lock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1153 hlist_del_rcu(&tvlv_handler
->list
);
1154 spin_unlock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1155 batadv_tvlv_handler_free_ref(tvlv_handler
);
1159 * batadv_tvlv_unicast_send - send a unicast packet with tvlv payload to the
1161 * @bat_priv: the bat priv with all the soft interface information
1162 * @src: source mac address of the unicast packet
1163 * @dst: destination mac address of the unicast packet
1165 * @version: tvlv version
1166 * @tvlv_value: tvlv content
1167 * @tvlv_value_len: tvlv content length
1169 void batadv_tvlv_unicast_send(struct batadv_priv
*bat_priv
, u8
*src
,
1170 u8
*dst
, u8 type
, u8 version
,
1171 void *tvlv_value
, u16 tvlv_value_len
)
1173 struct batadv_unicast_tvlv_packet
*unicast_tvlv_packet
;
1174 struct batadv_tvlv_hdr
*tvlv_hdr
;
1175 struct batadv_orig_node
*orig_node
;
1176 struct sk_buff
*skb
;
1177 unsigned char *tvlv_buff
;
1178 unsigned int tvlv_len
;
1179 ssize_t hdr_len
= sizeof(*unicast_tvlv_packet
);
1181 orig_node
= batadv_orig_hash_find(bat_priv
, dst
);
1185 tvlv_len
= sizeof(*tvlv_hdr
) + tvlv_value_len
;
1187 skb
= netdev_alloc_skb_ip_align(NULL
, ETH_HLEN
+ hdr_len
+ tvlv_len
);
1191 skb
->priority
= TC_PRIO_CONTROL
;
1192 skb_reserve(skb
, ETH_HLEN
);
1193 tvlv_buff
= skb_put(skb
, sizeof(*unicast_tvlv_packet
) + tvlv_len
);
1194 unicast_tvlv_packet
= (struct batadv_unicast_tvlv_packet
*)tvlv_buff
;
1195 unicast_tvlv_packet
->packet_type
= BATADV_UNICAST_TVLV
;
1196 unicast_tvlv_packet
->version
= BATADV_COMPAT_VERSION
;
1197 unicast_tvlv_packet
->ttl
= BATADV_TTL
;
1198 unicast_tvlv_packet
->reserved
= 0;
1199 unicast_tvlv_packet
->tvlv_len
= htons(tvlv_len
);
1200 unicast_tvlv_packet
->align
= 0;
1201 ether_addr_copy(unicast_tvlv_packet
->src
, src
);
1202 ether_addr_copy(unicast_tvlv_packet
->dst
, dst
);
1204 tvlv_buff
= (unsigned char *)(unicast_tvlv_packet
+ 1);
1205 tvlv_hdr
= (struct batadv_tvlv_hdr
*)tvlv_buff
;
1206 tvlv_hdr
->version
= version
;
1207 tvlv_hdr
->type
= type
;
1208 tvlv_hdr
->len
= htons(tvlv_value_len
);
1209 tvlv_buff
+= sizeof(*tvlv_hdr
);
1210 memcpy(tvlv_buff
, tvlv_value
, tvlv_value_len
);
1212 if (batadv_send_skb_to_orig(skb
, orig_node
, NULL
) == NET_XMIT_DROP
)
1215 batadv_orig_node_put(orig_node
);
1219 * batadv_get_vid - extract the VLAN identifier from skb if any
1220 * @skb: the buffer containing the packet
1221 * @header_len: length of the batman header preceding the ethernet header
1223 * Return: VID with the BATADV_VLAN_HAS_TAG flag when the packet embedded in the
1224 * skb is vlan tagged. Otherwise BATADV_NO_FLAGS.
1226 unsigned short batadv_get_vid(struct sk_buff
*skb
, size_t header_len
)
1228 struct ethhdr
*ethhdr
= (struct ethhdr
*)(skb
->data
+ header_len
);
1229 struct vlan_ethhdr
*vhdr
;
1232 if (ethhdr
->h_proto
!= htons(ETH_P_8021Q
))
1233 return BATADV_NO_FLAGS
;
1235 if (!pskb_may_pull(skb
, header_len
+ VLAN_ETH_HLEN
))
1236 return BATADV_NO_FLAGS
;
1238 vhdr
= (struct vlan_ethhdr
*)(skb
->data
+ header_len
);
1239 vid
= ntohs(vhdr
->h_vlan_TCI
) & VLAN_VID_MASK
;
1240 vid
|= BATADV_VLAN_HAS_TAG
;
1246 * batadv_vlan_ap_isola_get - return the AP isolation status for the given vlan
1247 * @bat_priv: the bat priv with all the soft interface information
1248 * @vid: the VLAN identifier for which the AP isolation attributed as to be
1251 * Return: true if AP isolation is on for the VLAN idenfied by vid, false
1254 bool batadv_vlan_ap_isola_get(struct batadv_priv
*bat_priv
, unsigned short vid
)
1256 bool ap_isolation_enabled
= false;
1257 struct batadv_softif_vlan
*vlan
;
1259 /* if the AP isolation is requested on a VLAN, then check for its
1260 * setting in the proper VLAN private data structure
1262 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
1264 ap_isolation_enabled
= atomic_read(&vlan
->ap_isolation
);
1265 batadv_softif_vlan_free_ref(vlan
);
1268 return ap_isolation_enabled
;
1271 static int batadv_param_set_ra(const char *val
, const struct kernel_param
*kp
)
1273 struct batadv_algo_ops
*bat_algo_ops
;
1274 char *algo_name
= (char *)val
;
1275 size_t name_len
= strlen(algo_name
);
1277 if (name_len
> 0 && algo_name
[name_len
- 1] == '\n')
1278 algo_name
[name_len
- 1] = '\0';
1280 bat_algo_ops
= batadv_algo_get(algo_name
);
1281 if (!bat_algo_ops
) {
1282 pr_err("Routing algorithm '%s' is not supported\n", algo_name
);
1286 return param_set_copystring(algo_name
, kp
);
1289 static const struct kernel_param_ops batadv_param_ops_ra
= {
1290 .set
= batadv_param_set_ra
,
1291 .get
= param_get_string
,
1294 static struct kparam_string batadv_param_string_ra
= {
1295 .maxlen
= sizeof(batadv_routing_algo
),
1296 .string
= batadv_routing_algo
,
1299 module_param_cb(routing_algo
, &batadv_param_ops_ra
, &batadv_param_string_ra
,
1301 module_init(batadv_init
);
1302 module_exit(batadv_exit
);
1304 MODULE_LICENSE("GPL");
1306 MODULE_AUTHOR(BATADV_DRIVER_AUTHOR
);
1307 MODULE_DESCRIPTION(BATADV_DRIVER_DESC
);
1308 MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE
);
1309 MODULE_VERSION(BATADV_SOURCE_VERSION
);