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();
94 batadv_event_workqueue
= create_singlethread_workqueue("bat_events");
96 if (!batadv_event_workqueue
)
100 batadv_debugfs_init();
102 register_netdevice_notifier(&batadv_hard_if_notifier
);
103 rtnl_link_register(&batadv_link_ops
);
105 pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n",
106 BATADV_SOURCE_VERSION
, BATADV_COMPAT_VERSION
);
111 static void __exit
batadv_exit(void)
113 batadv_debugfs_destroy();
114 rtnl_link_unregister(&batadv_link_ops
);
115 unregister_netdevice_notifier(&batadv_hard_if_notifier
);
116 batadv_hardif_remove_interfaces();
118 flush_workqueue(batadv_event_workqueue
);
119 destroy_workqueue(batadv_event_workqueue
);
120 batadv_event_workqueue
= NULL
;
125 int batadv_mesh_init(struct net_device
*soft_iface
)
127 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
130 spin_lock_init(&bat_priv
->forw_bat_list_lock
);
131 spin_lock_init(&bat_priv
->forw_bcast_list_lock
);
132 spin_lock_init(&bat_priv
->tt
.changes_list_lock
);
133 spin_lock_init(&bat_priv
->tt
.req_list_lock
);
134 spin_lock_init(&bat_priv
->tt
.roam_list_lock
);
135 spin_lock_init(&bat_priv
->tt
.last_changeset_lock
);
136 spin_lock_init(&bat_priv
->tt
.commit_lock
);
137 spin_lock_init(&bat_priv
->gw
.list_lock
);
138 #ifdef CONFIG_BATMAN_ADV_MCAST
139 spin_lock_init(&bat_priv
->mcast
.want_lists_lock
);
141 spin_lock_init(&bat_priv
->tvlv
.container_list_lock
);
142 spin_lock_init(&bat_priv
->tvlv
.handler_list_lock
);
143 spin_lock_init(&bat_priv
->softif_vlan_list_lock
);
145 INIT_HLIST_HEAD(&bat_priv
->forw_bat_list
);
146 INIT_HLIST_HEAD(&bat_priv
->forw_bcast_list
);
147 INIT_HLIST_HEAD(&bat_priv
->gw
.list
);
148 #ifdef CONFIG_BATMAN_ADV_MCAST
149 INIT_HLIST_HEAD(&bat_priv
->mcast
.want_all_unsnoopables_list
);
150 INIT_HLIST_HEAD(&bat_priv
->mcast
.want_all_ipv4_list
);
151 INIT_HLIST_HEAD(&bat_priv
->mcast
.want_all_ipv6_list
);
153 INIT_LIST_HEAD(&bat_priv
->tt
.changes_list
);
154 INIT_HLIST_HEAD(&bat_priv
->tt
.req_list
);
155 INIT_LIST_HEAD(&bat_priv
->tt
.roam_list
);
156 #ifdef CONFIG_BATMAN_ADV_MCAST
157 INIT_HLIST_HEAD(&bat_priv
->mcast
.mla_list
);
159 INIT_HLIST_HEAD(&bat_priv
->tvlv
.container_list
);
160 INIT_HLIST_HEAD(&bat_priv
->tvlv
.handler_list
);
161 INIT_HLIST_HEAD(&bat_priv
->softif_vlan_list
);
163 ret
= batadv_v_mesh_init(bat_priv
);
167 ret
= batadv_originator_init(bat_priv
);
171 ret
= batadv_tt_init(bat_priv
);
175 ret
= batadv_bla_init(bat_priv
);
179 ret
= batadv_dat_init(bat_priv
);
183 ret
= batadv_nc_mesh_init(bat_priv
);
187 batadv_gw_init(bat_priv
);
188 batadv_mcast_init(bat_priv
);
190 atomic_set(&bat_priv
->gw
.reselect
, 0);
191 atomic_set(&bat_priv
->mesh_state
, BATADV_MESH_ACTIVE
);
196 batadv_mesh_free(soft_iface
);
200 void batadv_mesh_free(struct net_device
*soft_iface
)
202 struct batadv_priv
*bat_priv
= netdev_priv(soft_iface
);
204 atomic_set(&bat_priv
->mesh_state
, BATADV_MESH_DEACTIVATING
);
206 batadv_purge_outstanding_packets(bat_priv
, NULL
);
208 batadv_gw_node_free(bat_priv
);
210 batadv_v_mesh_free(bat_priv
);
211 batadv_nc_mesh_free(bat_priv
);
212 batadv_dat_free(bat_priv
);
213 batadv_bla_free(bat_priv
);
215 batadv_mcast_free(bat_priv
);
217 /* Free the TT and the originator tables only after having terminated
218 * all the other depending components which may use these structures for
221 batadv_tt_free(bat_priv
);
223 /* Since the originator table clean up routine is accessing the TT
224 * tables as well, it has to be invoked after the TT tables have been
225 * freed and marked as empty. This ensures that no cleanup RCU callbacks
226 * accessing the TT data are scheduled for later execution.
228 batadv_originator_free(bat_priv
);
230 batadv_gw_free(bat_priv
);
232 free_percpu(bat_priv
->bat_counters
);
233 bat_priv
->bat_counters
= NULL
;
235 atomic_set(&bat_priv
->mesh_state
, BATADV_MESH_INACTIVE
);
239 * batadv_is_my_mac - check if the given mac address belongs to any of the real
240 * interfaces in the current mesh
241 * @bat_priv: the bat priv with all the soft interface information
242 * @addr: the address to check
244 * Return: 'true' if the mac address was found, false otherwise.
246 bool batadv_is_my_mac(struct batadv_priv
*bat_priv
, const u8
*addr
)
248 const struct batadv_hard_iface
*hard_iface
;
249 bool is_my_mac
= false;
252 list_for_each_entry_rcu(hard_iface
, &batadv_hardif_list
, list
) {
253 if (hard_iface
->if_status
!= BATADV_IF_ACTIVE
)
256 if (hard_iface
->soft_iface
!= bat_priv
->soft_iface
)
259 if (batadv_compare_eth(hard_iface
->net_dev
->dev_addr
, addr
)) {
269 * batadv_seq_print_text_primary_if_get - called from debugfs table printing
270 * function that requires the primary interface
271 * @seq: debugfs table seq_file struct
273 * Return: primary interface if found or NULL otherwise.
275 struct batadv_hard_iface
*
276 batadv_seq_print_text_primary_if_get(struct seq_file
*seq
)
278 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
279 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
280 struct batadv_hard_iface
*primary_if
;
282 primary_if
= batadv_primary_if_get_selected(bat_priv
);
286 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
291 if (primary_if
->if_status
== BATADV_IF_ACTIVE
)
295 "BATMAN mesh %s disabled - primary interface not active\n",
297 batadv_hardif_put(primary_if
);
305 * batadv_max_header_len - calculate maximum encapsulation overhead for a
308 * Return: the maximum encapsulation overhead in bytes.
310 int batadv_max_header_len(void)
314 header_len
= max_t(int, header_len
,
315 sizeof(struct batadv_unicast_packet
));
316 header_len
= max_t(int, header_len
,
317 sizeof(struct batadv_unicast_4addr_packet
));
318 header_len
= max_t(int, header_len
,
319 sizeof(struct batadv_bcast_packet
));
321 #ifdef CONFIG_BATMAN_ADV_NC
322 header_len
= max_t(int, header_len
,
323 sizeof(struct batadv_coded_packet
));
326 return header_len
+ ETH_HLEN
;
330 * batadv_skb_set_priority - sets skb priority according to packet content
331 * @skb: the packet to be sent
332 * @offset: offset to the packet content
334 * This function sets a value between 256 and 263 (802.1d priority), which
335 * can be interpreted by the cfg80211 or other drivers.
337 void batadv_skb_set_priority(struct sk_buff
*skb
, int offset
)
339 struct iphdr ip_hdr_tmp
, *ip_hdr
;
340 struct ipv6hdr ip6_hdr_tmp
, *ip6_hdr
;
341 struct ethhdr ethhdr_tmp
, *ethhdr
;
342 struct vlan_ethhdr
*vhdr
, vhdr_tmp
;
345 /* already set, do nothing */
346 if (skb
->priority
>= 256 && skb
->priority
<= 263)
349 ethhdr
= skb_header_pointer(skb
, offset
, sizeof(*ethhdr
), ðhdr_tmp
);
353 switch (ethhdr
->h_proto
) {
354 case htons(ETH_P_8021Q
):
355 vhdr
= skb_header_pointer(skb
, offset
+ sizeof(*vhdr
),
356 sizeof(*vhdr
), &vhdr_tmp
);
359 prio
= ntohs(vhdr
->h_vlan_TCI
) & VLAN_PRIO_MASK
;
360 prio
= prio
>> VLAN_PRIO_SHIFT
;
362 case htons(ETH_P_IP
):
363 ip_hdr
= skb_header_pointer(skb
, offset
+ sizeof(*ethhdr
),
364 sizeof(*ip_hdr
), &ip_hdr_tmp
);
367 prio
= (ipv4_get_dsfield(ip_hdr
) & 0xfc) >> 5;
369 case htons(ETH_P_IPV6
):
370 ip6_hdr
= skb_header_pointer(skb
, offset
+ sizeof(*ethhdr
),
371 sizeof(*ip6_hdr
), &ip6_hdr_tmp
);
374 prio
= (ipv6_get_dsfield(ip6_hdr
) & 0xfc) >> 5;
380 skb
->priority
= prio
+ 256;
383 static int batadv_recv_unhandled_packet(struct sk_buff
*skb
,
384 struct batadv_hard_iface
*recv_if
)
389 /* incoming packets with the batman ethertype received on any active hard
392 int batadv_batman_skb_recv(struct sk_buff
*skb
, struct net_device
*dev
,
393 struct packet_type
*ptype
,
394 struct net_device
*orig_dev
)
396 struct batadv_priv
*bat_priv
;
397 struct batadv_ogm_packet
*batadv_ogm_packet
;
398 struct batadv_hard_iface
*hard_iface
;
402 hard_iface
= container_of(ptype
, struct batadv_hard_iface
,
405 /* Prevent processing a packet received on an interface which is getting
406 * shut down otherwise the packet may trigger de-reference errors
407 * further down in the receive path.
409 if (!kref_get_unless_zero(&hard_iface
->refcount
))
412 skb
= skb_share_check(skb
, GFP_ATOMIC
);
414 /* skb was released by skb_share_check() */
418 /* packet should hold at least type and version */
419 if (unlikely(!pskb_may_pull(skb
, 2)))
422 /* expect a valid ethernet header here. */
423 if (unlikely(skb
->mac_len
!= ETH_HLEN
|| !skb_mac_header(skb
)))
426 if (!hard_iface
->soft_iface
)
429 bat_priv
= netdev_priv(hard_iface
->soft_iface
);
431 if (atomic_read(&bat_priv
->mesh_state
) != BATADV_MESH_ACTIVE
)
434 /* discard frames on not active interfaces */
435 if (hard_iface
->if_status
!= BATADV_IF_ACTIVE
)
438 batadv_ogm_packet
= (struct batadv_ogm_packet
*)skb
->data
;
440 if (batadv_ogm_packet
->version
!= BATADV_COMPAT_VERSION
) {
441 batadv_dbg(BATADV_DBG_BATMAN
, bat_priv
,
442 "Drop packet: incompatible batman version (%i)\n",
443 batadv_ogm_packet
->version
);
447 /* reset control block to avoid left overs from previous users */
448 memset(skb
->cb
, 0, sizeof(struct batadv_skb_cb
));
450 /* all receive handlers return whether they received or reused
451 * the supplied skb. if not, we have to free the skb.
453 idx
= batadv_ogm_packet
->packet_type
;
454 ret
= (*batadv_rx_handler
[idx
])(skb
, hard_iface
);
456 if (ret
== NET_RX_DROP
)
459 batadv_hardif_put(hard_iface
);
461 /* return NET_RX_SUCCESS in any case as we
462 * most probably dropped the packet for
463 * routing-logical reasons.
465 return NET_RX_SUCCESS
;
470 batadv_hardif_put(hard_iface
);
475 static void batadv_recv_handler_init(void)
479 for (i
= 0; i
< ARRAY_SIZE(batadv_rx_handler
); i
++)
480 batadv_rx_handler
[i
] = batadv_recv_unhandled_packet
;
482 for (i
= BATADV_UNICAST_MIN
; i
<= BATADV_UNICAST_MAX
; i
++)
483 batadv_rx_handler
[i
] = batadv_recv_unhandled_unicast_packet
;
485 /* compile time checks for sizes */
486 BUILD_BUG_ON(sizeof(struct batadv_bla_claim_dst
) != 6);
487 BUILD_BUG_ON(sizeof(struct batadv_ogm_packet
) != 24);
488 BUILD_BUG_ON(sizeof(struct batadv_icmp_header
) != 20);
489 BUILD_BUG_ON(sizeof(struct batadv_icmp_packet
) != 20);
490 BUILD_BUG_ON(sizeof(struct batadv_icmp_packet_rr
) != 116);
491 BUILD_BUG_ON(sizeof(struct batadv_unicast_packet
) != 10);
492 BUILD_BUG_ON(sizeof(struct batadv_unicast_4addr_packet
) != 18);
493 BUILD_BUG_ON(sizeof(struct batadv_frag_packet
) != 20);
494 BUILD_BUG_ON(sizeof(struct batadv_bcast_packet
) != 14);
495 BUILD_BUG_ON(sizeof(struct batadv_coded_packet
) != 46);
496 BUILD_BUG_ON(sizeof(struct batadv_unicast_tvlv_packet
) != 20);
497 BUILD_BUG_ON(sizeof(struct batadv_tvlv_hdr
) != 4);
498 BUILD_BUG_ON(sizeof(struct batadv_tvlv_gateway_data
) != 8);
499 BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_vlan_data
) != 8);
500 BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_change
) != 12);
501 BUILD_BUG_ON(sizeof(struct batadv_tvlv_roam_adv
) != 8);
503 /* broadcast packet */
504 batadv_rx_handler
[BATADV_BCAST
] = batadv_recv_bcast_packet
;
506 /* unicast packets ... */
507 /* unicast with 4 addresses packet */
508 batadv_rx_handler
[BATADV_UNICAST_4ADDR
] = batadv_recv_unicast_packet
;
510 batadv_rx_handler
[BATADV_UNICAST
] = batadv_recv_unicast_packet
;
511 /* unicast tvlv packet */
512 batadv_rx_handler
[BATADV_UNICAST_TVLV
] = batadv_recv_unicast_tvlv
;
513 /* batman icmp packet */
514 batadv_rx_handler
[BATADV_ICMP
] = batadv_recv_icmp_packet
;
515 /* Fragmented packets */
516 batadv_rx_handler
[BATADV_UNICAST_FRAG
] = batadv_recv_frag_packet
;
520 batadv_recv_handler_register(u8 packet_type
,
521 int (*recv_handler
)(struct sk_buff
*,
522 struct batadv_hard_iface
*))
524 int (*curr
)(struct sk_buff
*,
525 struct batadv_hard_iface
*);
526 curr
= batadv_rx_handler
[packet_type
];
528 if ((curr
!= batadv_recv_unhandled_packet
) &&
529 (curr
!= batadv_recv_unhandled_unicast_packet
))
532 batadv_rx_handler
[packet_type
] = recv_handler
;
536 void batadv_recv_handler_unregister(u8 packet_type
)
538 batadv_rx_handler
[packet_type
] = batadv_recv_unhandled_packet
;
541 static struct batadv_algo_ops
*batadv_algo_get(char *name
)
543 struct batadv_algo_ops
*bat_algo_ops
= NULL
, *bat_algo_ops_tmp
;
545 hlist_for_each_entry(bat_algo_ops_tmp
, &batadv_algo_list
, list
) {
546 if (strcmp(bat_algo_ops_tmp
->name
, name
) != 0)
549 bat_algo_ops
= bat_algo_ops_tmp
;
556 int batadv_algo_register(struct batadv_algo_ops
*bat_algo_ops
)
558 struct batadv_algo_ops
*bat_algo_ops_tmp
;
560 bat_algo_ops_tmp
= batadv_algo_get(bat_algo_ops
->name
);
561 if (bat_algo_ops_tmp
) {
562 pr_info("Trying to register already registered routing algorithm: %s\n",
567 /* all algorithms must implement all ops (for now) */
568 if (!bat_algo_ops
->bat_iface_enable
||
569 !bat_algo_ops
->bat_iface_disable
||
570 !bat_algo_ops
->bat_iface_update_mac
||
571 !bat_algo_ops
->bat_primary_iface_set
||
572 !bat_algo_ops
->bat_ogm_schedule
||
573 !bat_algo_ops
->bat_ogm_emit
||
574 !bat_algo_ops
->bat_neigh_cmp
||
575 !bat_algo_ops
->bat_neigh_is_similar_or_better
) {
576 pr_info("Routing algo '%s' does not implement required ops\n",
581 INIT_HLIST_NODE(&bat_algo_ops
->list
);
582 hlist_add_head(&bat_algo_ops
->list
, &batadv_algo_list
);
587 int batadv_algo_select(struct batadv_priv
*bat_priv
, char *name
)
589 struct batadv_algo_ops
*bat_algo_ops
;
591 bat_algo_ops
= batadv_algo_get(name
);
595 bat_priv
->bat_algo_ops
= bat_algo_ops
;
600 int batadv_algo_seq_print_text(struct seq_file
*seq
, void *offset
)
602 struct batadv_algo_ops
*bat_algo_ops
;
604 seq_puts(seq
, "Available routing algorithms:\n");
606 hlist_for_each_entry(bat_algo_ops
, &batadv_algo_list
, list
) {
607 seq_printf(seq
, " * %s\n", bat_algo_ops
->name
);
614 * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in
616 * @skb: skb pointing to fragmented socket buffers
617 * @payload_ptr: Pointer to position inside the head buffer of the skb
618 * marking the start of the data to be CRC'ed
620 * payload_ptr must always point to an address in the skb head buffer and not to
623 * Return: big endian crc32c of the checksummed data
625 __be32
batadv_skb_crc32(struct sk_buff
*skb
, u8
*payload_ptr
)
629 unsigned int to
= skb
->len
;
630 struct skb_seq_state st
;
633 unsigned int consumed
= 0;
635 from
= (unsigned int)(payload_ptr
- skb
->data
);
637 skb_prepare_seq_read(skb
, from
, to
, &st
);
638 while ((len
= skb_seq_read(consumed
, &data
, &st
)) != 0) {
639 crc
= crc32c(crc
, data
, len
);
647 * batadv_tvlv_handler_release - release tvlv handler from lists and queue for
648 * free after rcu grace period
649 * @ref: kref pointer of the tvlv
651 static void batadv_tvlv_handler_release(struct kref
*ref
)
653 struct batadv_tvlv_handler
*tvlv_handler
;
655 tvlv_handler
= container_of(ref
, struct batadv_tvlv_handler
, refcount
);
656 kfree_rcu(tvlv_handler
, rcu
);
660 * batadv_tvlv_handler_put - decrement the tvlv container refcounter and
661 * possibly release it
662 * @tvlv_handler: the tvlv handler to free
664 static void batadv_tvlv_handler_put(struct batadv_tvlv_handler
*tvlv_handler
)
666 kref_put(&tvlv_handler
->refcount
, batadv_tvlv_handler_release
);
670 * batadv_tvlv_handler_get - retrieve tvlv handler from the tvlv handler list
671 * based on the provided type and version (both need to match)
672 * @bat_priv: the bat priv with all the soft interface information
673 * @type: tvlv handler type to look for
674 * @version: tvlv handler version to look for
676 * Return: tvlv handler if found or NULL otherwise.
678 static struct batadv_tvlv_handler
*
679 batadv_tvlv_handler_get(struct batadv_priv
*bat_priv
, u8 type
, u8 version
)
681 struct batadv_tvlv_handler
*tvlv_handler_tmp
, *tvlv_handler
= NULL
;
684 hlist_for_each_entry_rcu(tvlv_handler_tmp
,
685 &bat_priv
->tvlv
.handler_list
, list
) {
686 if (tvlv_handler_tmp
->type
!= type
)
689 if (tvlv_handler_tmp
->version
!= version
)
692 if (!kref_get_unless_zero(&tvlv_handler_tmp
->refcount
))
695 tvlv_handler
= tvlv_handler_tmp
;
704 * batadv_tvlv_container_release - release tvlv from lists and free
705 * @ref: kref pointer of the tvlv
707 static void batadv_tvlv_container_release(struct kref
*ref
)
709 struct batadv_tvlv_container
*tvlv
;
711 tvlv
= container_of(ref
, struct batadv_tvlv_container
, refcount
);
716 * batadv_tvlv_container_put - decrement the tvlv container refcounter and
717 * possibly release it
718 * @tvlv: the tvlv container to free
720 static void batadv_tvlv_container_put(struct batadv_tvlv_container
*tvlv
)
722 kref_put(&tvlv
->refcount
, batadv_tvlv_container_release
);
726 * batadv_tvlv_container_get - retrieve tvlv container from the tvlv container
727 * list based on the provided type and version (both need to match)
728 * @bat_priv: the bat priv with all the soft interface information
729 * @type: tvlv container type to look for
730 * @version: tvlv container version to look for
732 * Has to be called with the appropriate locks being acquired
733 * (tvlv.container_list_lock).
735 * Return: tvlv container if found or NULL otherwise.
737 static struct batadv_tvlv_container
*
738 batadv_tvlv_container_get(struct batadv_priv
*bat_priv
, u8 type
, u8 version
)
740 struct batadv_tvlv_container
*tvlv_tmp
, *tvlv
= NULL
;
742 lockdep_assert_held(&bat_priv
->tvlv
.container_list_lock
);
744 hlist_for_each_entry(tvlv_tmp
, &bat_priv
->tvlv
.container_list
, list
) {
745 if (tvlv_tmp
->tvlv_hdr
.type
!= type
)
748 if (tvlv_tmp
->tvlv_hdr
.version
!= version
)
751 kref_get(&tvlv_tmp
->refcount
);
760 * batadv_tvlv_container_list_size - calculate the size of the tvlv container
762 * @bat_priv: the bat priv with all the soft interface information
764 * Has to be called with the appropriate locks being acquired
765 * (tvlv.container_list_lock).
767 * Return: size of all currently registered tvlv containers in bytes.
769 static u16
batadv_tvlv_container_list_size(struct batadv_priv
*bat_priv
)
771 struct batadv_tvlv_container
*tvlv
;
774 lockdep_assert_held(&bat_priv
->tvlv
.container_list_lock
);
776 hlist_for_each_entry(tvlv
, &bat_priv
->tvlv
.container_list
, list
) {
777 tvlv_len
+= sizeof(struct batadv_tvlv_hdr
);
778 tvlv_len
+= ntohs(tvlv
->tvlv_hdr
.len
);
785 * batadv_tvlv_container_remove - remove tvlv container from the tvlv container
787 * @bat_priv: the bat priv with all the soft interface information
788 * @tvlv: the to be removed tvlv container
790 * Has to be called with the appropriate locks being acquired
791 * (tvlv.container_list_lock).
793 static void batadv_tvlv_container_remove(struct batadv_priv
*bat_priv
,
794 struct batadv_tvlv_container
*tvlv
)
796 lockdep_assert_held(&bat_priv
->tvlv
.container_list_lock
);
801 hlist_del(&tvlv
->list
);
803 /* first call to decrement the counter, second call to free */
804 batadv_tvlv_container_put(tvlv
);
805 batadv_tvlv_container_put(tvlv
);
809 * batadv_tvlv_container_unregister - unregister tvlv container based on the
810 * provided type and version (both need to match)
811 * @bat_priv: the bat priv with all the soft interface information
812 * @type: tvlv container type to unregister
813 * @version: tvlv container type to unregister
815 void batadv_tvlv_container_unregister(struct batadv_priv
*bat_priv
,
818 struct batadv_tvlv_container
*tvlv
;
820 spin_lock_bh(&bat_priv
->tvlv
.container_list_lock
);
821 tvlv
= batadv_tvlv_container_get(bat_priv
, type
, version
);
822 batadv_tvlv_container_remove(bat_priv
, tvlv
);
823 spin_unlock_bh(&bat_priv
->tvlv
.container_list_lock
);
827 * batadv_tvlv_container_register - register tvlv type, version and content
828 * to be propagated with each (primary interface) OGM
829 * @bat_priv: the bat priv with all the soft interface information
830 * @type: tvlv container type
831 * @version: tvlv container version
832 * @tvlv_value: tvlv container content
833 * @tvlv_value_len: tvlv container content length
835 * If a container of the same type and version was already registered the new
836 * content is going to replace the old one.
838 void batadv_tvlv_container_register(struct batadv_priv
*bat_priv
,
840 void *tvlv_value
, u16 tvlv_value_len
)
842 struct batadv_tvlv_container
*tvlv_old
, *tvlv_new
;
847 tvlv_new
= kzalloc(sizeof(*tvlv_new
) + tvlv_value_len
, GFP_ATOMIC
);
851 tvlv_new
->tvlv_hdr
.version
= version
;
852 tvlv_new
->tvlv_hdr
.type
= type
;
853 tvlv_new
->tvlv_hdr
.len
= htons(tvlv_value_len
);
855 memcpy(tvlv_new
+ 1, tvlv_value
, ntohs(tvlv_new
->tvlv_hdr
.len
));
856 INIT_HLIST_NODE(&tvlv_new
->list
);
857 kref_init(&tvlv_new
->refcount
);
859 spin_lock_bh(&bat_priv
->tvlv
.container_list_lock
);
860 tvlv_old
= batadv_tvlv_container_get(bat_priv
, type
, version
);
861 batadv_tvlv_container_remove(bat_priv
, tvlv_old
);
862 hlist_add_head(&tvlv_new
->list
, &bat_priv
->tvlv
.container_list
);
863 spin_unlock_bh(&bat_priv
->tvlv
.container_list_lock
);
867 * batadv_tvlv_realloc_packet_buff - reallocate packet buffer to accommodate
868 * requested packet size
869 * @packet_buff: packet buffer
870 * @packet_buff_len: packet buffer size
871 * @min_packet_len: requested packet minimum size
872 * @additional_packet_len: requested additional packet size on top of minimum
875 * Return: true of the packet buffer could be changed to the requested size,
878 static bool batadv_tvlv_realloc_packet_buff(unsigned char **packet_buff
,
879 int *packet_buff_len
,
881 int additional_packet_len
)
883 unsigned char *new_buff
;
885 new_buff
= kmalloc(min_packet_len
+ additional_packet_len
, GFP_ATOMIC
);
887 /* keep old buffer if kmalloc should fail */
891 memcpy(new_buff
, *packet_buff
, min_packet_len
);
893 *packet_buff
= new_buff
;
894 *packet_buff_len
= min_packet_len
+ additional_packet_len
;
900 * batadv_tvlv_container_ogm_append - append tvlv container content to given
902 * @bat_priv: the bat priv with all the soft interface information
903 * @packet_buff: ogm packet buffer
904 * @packet_buff_len: ogm packet buffer size including ogm header and tvlv
906 * @packet_min_len: ogm header size to be preserved for the OGM itself
908 * The ogm packet might be enlarged or shrunk depending on the current size
909 * and the size of the to-be-appended tvlv containers.
911 * Return: size of all appended tvlv containers in bytes.
913 u16
batadv_tvlv_container_ogm_append(struct batadv_priv
*bat_priv
,
914 unsigned char **packet_buff
,
915 int *packet_buff_len
, int packet_min_len
)
917 struct batadv_tvlv_container
*tvlv
;
918 struct batadv_tvlv_hdr
*tvlv_hdr
;
923 spin_lock_bh(&bat_priv
->tvlv
.container_list_lock
);
924 tvlv_value_len
= batadv_tvlv_container_list_size(bat_priv
);
926 ret
= batadv_tvlv_realloc_packet_buff(packet_buff
, packet_buff_len
,
927 packet_min_len
, tvlv_value_len
);
935 tvlv_value
= (*packet_buff
) + packet_min_len
;
937 hlist_for_each_entry(tvlv
, &bat_priv
->tvlv
.container_list
, list
) {
938 tvlv_hdr
= tvlv_value
;
939 tvlv_hdr
->type
= tvlv
->tvlv_hdr
.type
;
940 tvlv_hdr
->version
= tvlv
->tvlv_hdr
.version
;
941 tvlv_hdr
->len
= tvlv
->tvlv_hdr
.len
;
942 tvlv_value
= tvlv_hdr
+ 1;
943 memcpy(tvlv_value
, tvlv
+ 1, ntohs(tvlv
->tvlv_hdr
.len
));
944 tvlv_value
= (u8
*)tvlv_value
+ ntohs(tvlv
->tvlv_hdr
.len
);
948 spin_unlock_bh(&bat_priv
->tvlv
.container_list_lock
);
949 return tvlv_value_len
;
953 * batadv_tvlv_call_handler - parse the given tvlv buffer to call the
954 * appropriate handlers
955 * @bat_priv: the bat priv with all the soft interface information
956 * @tvlv_handler: tvlv callback function handling the tvlv content
957 * @ogm_source: flag indicating whether the tvlv is an ogm or a unicast packet
958 * @orig_node: orig node emitting the ogm packet
959 * @src: source mac address of the unicast packet
960 * @dst: destination mac address of the unicast packet
961 * @tvlv_value: tvlv content
962 * @tvlv_value_len: tvlv content length
964 * Return: success if handler was not found or the return value of the handler
967 static int batadv_tvlv_call_handler(struct batadv_priv
*bat_priv
,
968 struct batadv_tvlv_handler
*tvlv_handler
,
970 struct batadv_orig_node
*orig_node
,
972 void *tvlv_value
, u16 tvlv_value_len
)
975 return NET_RX_SUCCESS
;
978 if (!tvlv_handler
->ogm_handler
)
979 return NET_RX_SUCCESS
;
982 return NET_RX_SUCCESS
;
984 tvlv_handler
->ogm_handler(bat_priv
, orig_node
,
986 tvlv_value
, tvlv_value_len
);
987 tvlv_handler
->flags
|= BATADV_TVLV_HANDLER_OGM_CALLED
;
990 return NET_RX_SUCCESS
;
993 return NET_RX_SUCCESS
;
995 if (!tvlv_handler
->unicast_handler
)
996 return NET_RX_SUCCESS
;
998 return tvlv_handler
->unicast_handler(bat_priv
, src
,
1003 return NET_RX_SUCCESS
;
1007 * batadv_tvlv_containers_process - parse the given tvlv buffer to call the
1008 * appropriate handlers
1009 * @bat_priv: the bat priv with all the soft interface information
1010 * @ogm_source: flag indicating whether the tvlv is an ogm or a unicast packet
1011 * @orig_node: orig node emitting the ogm packet
1012 * @src: source mac address of the unicast packet
1013 * @dst: destination mac address of the unicast packet
1014 * @tvlv_value: tvlv content
1015 * @tvlv_value_len: tvlv content length
1017 * Return: success when processing an OGM or the return value of all called
1018 * handler callbacks.
1020 int batadv_tvlv_containers_process(struct batadv_priv
*bat_priv
,
1022 struct batadv_orig_node
*orig_node
,
1024 void *tvlv_value
, u16 tvlv_value_len
)
1026 struct batadv_tvlv_handler
*tvlv_handler
;
1027 struct batadv_tvlv_hdr
*tvlv_hdr
;
1028 u16 tvlv_value_cont_len
;
1029 u8 cifnotfound
= BATADV_TVLV_HANDLER_OGM_CIFNOTFND
;
1030 int ret
= NET_RX_SUCCESS
;
1032 while (tvlv_value_len
>= sizeof(*tvlv_hdr
)) {
1033 tvlv_hdr
= tvlv_value
;
1034 tvlv_value_cont_len
= ntohs(tvlv_hdr
->len
);
1035 tvlv_value
= tvlv_hdr
+ 1;
1036 tvlv_value_len
-= sizeof(*tvlv_hdr
);
1038 if (tvlv_value_cont_len
> tvlv_value_len
)
1041 tvlv_handler
= batadv_tvlv_handler_get(bat_priv
,
1045 ret
|= batadv_tvlv_call_handler(bat_priv
, tvlv_handler
,
1046 ogm_source
, orig_node
,
1047 src
, dst
, tvlv_value
,
1048 tvlv_value_cont_len
);
1050 batadv_tvlv_handler_put(tvlv_handler
);
1051 tvlv_value
= (u8
*)tvlv_value
+ tvlv_value_cont_len
;
1052 tvlv_value_len
-= tvlv_value_cont_len
;
1059 hlist_for_each_entry_rcu(tvlv_handler
,
1060 &bat_priv
->tvlv
.handler_list
, list
) {
1061 if ((tvlv_handler
->flags
& BATADV_TVLV_HANDLER_OGM_CIFNOTFND
) &&
1062 !(tvlv_handler
->flags
& BATADV_TVLV_HANDLER_OGM_CALLED
))
1063 tvlv_handler
->ogm_handler(bat_priv
, orig_node
,
1064 cifnotfound
, NULL
, 0);
1066 tvlv_handler
->flags
&= ~BATADV_TVLV_HANDLER_OGM_CALLED
;
1070 return NET_RX_SUCCESS
;
1074 * batadv_tvlv_ogm_receive - process an incoming ogm and call the appropriate
1076 * @bat_priv: the bat priv with all the soft interface information
1077 * @batadv_ogm_packet: ogm packet containing the tvlv containers
1078 * @orig_node: orig node emitting the ogm packet
1080 void batadv_tvlv_ogm_receive(struct batadv_priv
*bat_priv
,
1081 struct batadv_ogm_packet
*batadv_ogm_packet
,
1082 struct batadv_orig_node
*orig_node
)
1087 if (!batadv_ogm_packet
)
1090 tvlv_value_len
= ntohs(batadv_ogm_packet
->tvlv_len
);
1091 if (!tvlv_value_len
)
1094 tvlv_value
= batadv_ogm_packet
+ 1;
1096 batadv_tvlv_containers_process(bat_priv
, true, orig_node
, NULL
, NULL
,
1097 tvlv_value
, tvlv_value_len
);
1101 * batadv_tvlv_handler_register - register tvlv handler based on the provided
1102 * type and version (both need to match) for ogm tvlv payload and/or unicast
1104 * @bat_priv: the bat priv with all the soft interface information
1105 * @optr: ogm tvlv handler callback function. This function receives the orig
1106 * node, flags and the tvlv content as argument to process.
1107 * @uptr: unicast tvlv handler callback function. This function receives the
1108 * source & destination of the unicast packet as well as the tvlv content
1110 * @type: tvlv handler type to be registered
1111 * @version: tvlv handler version to be registered
1112 * @flags: flags to enable or disable TVLV API behavior
1114 void batadv_tvlv_handler_register(struct batadv_priv
*bat_priv
,
1115 void (*optr
)(struct batadv_priv
*bat_priv
,
1116 struct batadv_orig_node
*orig
,
1119 u16 tvlv_value_len
),
1120 int (*uptr
)(struct batadv_priv
*bat_priv
,
1123 u16 tvlv_value_len
),
1124 u8 type
, u8 version
, u8 flags
)
1126 struct batadv_tvlv_handler
*tvlv_handler
;
1128 tvlv_handler
= batadv_tvlv_handler_get(bat_priv
, type
, version
);
1130 batadv_tvlv_handler_put(tvlv_handler
);
1134 tvlv_handler
= kzalloc(sizeof(*tvlv_handler
), GFP_ATOMIC
);
1138 tvlv_handler
->ogm_handler
= optr
;
1139 tvlv_handler
->unicast_handler
= uptr
;
1140 tvlv_handler
->type
= type
;
1141 tvlv_handler
->version
= version
;
1142 tvlv_handler
->flags
= flags
;
1143 kref_init(&tvlv_handler
->refcount
);
1144 INIT_HLIST_NODE(&tvlv_handler
->list
);
1146 spin_lock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1147 hlist_add_head_rcu(&tvlv_handler
->list
, &bat_priv
->tvlv
.handler_list
);
1148 spin_unlock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1152 * batadv_tvlv_handler_unregister - unregister tvlv handler based on the
1153 * provided type and version (both need to match)
1154 * @bat_priv: the bat priv with all the soft interface information
1155 * @type: tvlv handler type to be unregistered
1156 * @version: tvlv handler version to be unregistered
1158 void batadv_tvlv_handler_unregister(struct batadv_priv
*bat_priv
,
1159 u8 type
, u8 version
)
1161 struct batadv_tvlv_handler
*tvlv_handler
;
1163 tvlv_handler
= batadv_tvlv_handler_get(bat_priv
, type
, version
);
1167 batadv_tvlv_handler_put(tvlv_handler
);
1168 spin_lock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1169 hlist_del_rcu(&tvlv_handler
->list
);
1170 spin_unlock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1171 batadv_tvlv_handler_put(tvlv_handler
);
1175 * batadv_tvlv_unicast_send - send a unicast packet with tvlv payload to the
1177 * @bat_priv: the bat priv with all the soft interface information
1178 * @src: source mac address of the unicast packet
1179 * @dst: destination mac address of the unicast packet
1181 * @version: tvlv version
1182 * @tvlv_value: tvlv content
1183 * @tvlv_value_len: tvlv content length
1185 void batadv_tvlv_unicast_send(struct batadv_priv
*bat_priv
, u8
*src
,
1186 u8
*dst
, u8 type
, u8 version
,
1187 void *tvlv_value
, u16 tvlv_value_len
)
1189 struct batadv_unicast_tvlv_packet
*unicast_tvlv_packet
;
1190 struct batadv_tvlv_hdr
*tvlv_hdr
;
1191 struct batadv_orig_node
*orig_node
;
1192 struct sk_buff
*skb
;
1193 unsigned char *tvlv_buff
;
1194 unsigned int tvlv_len
;
1195 ssize_t hdr_len
= sizeof(*unicast_tvlv_packet
);
1197 orig_node
= batadv_orig_hash_find(bat_priv
, dst
);
1201 tvlv_len
= sizeof(*tvlv_hdr
) + tvlv_value_len
;
1203 skb
= netdev_alloc_skb_ip_align(NULL
, ETH_HLEN
+ hdr_len
+ tvlv_len
);
1207 skb
->priority
= TC_PRIO_CONTROL
;
1208 skb_reserve(skb
, ETH_HLEN
);
1209 tvlv_buff
= skb_put(skb
, sizeof(*unicast_tvlv_packet
) + tvlv_len
);
1210 unicast_tvlv_packet
= (struct batadv_unicast_tvlv_packet
*)tvlv_buff
;
1211 unicast_tvlv_packet
->packet_type
= BATADV_UNICAST_TVLV
;
1212 unicast_tvlv_packet
->version
= BATADV_COMPAT_VERSION
;
1213 unicast_tvlv_packet
->ttl
= BATADV_TTL
;
1214 unicast_tvlv_packet
->reserved
= 0;
1215 unicast_tvlv_packet
->tvlv_len
= htons(tvlv_len
);
1216 unicast_tvlv_packet
->align
= 0;
1217 ether_addr_copy(unicast_tvlv_packet
->src
, src
);
1218 ether_addr_copy(unicast_tvlv_packet
->dst
, dst
);
1220 tvlv_buff
= (unsigned char *)(unicast_tvlv_packet
+ 1);
1221 tvlv_hdr
= (struct batadv_tvlv_hdr
*)tvlv_buff
;
1222 tvlv_hdr
->version
= version
;
1223 tvlv_hdr
->type
= type
;
1224 tvlv_hdr
->len
= htons(tvlv_value_len
);
1225 tvlv_buff
+= sizeof(*tvlv_hdr
);
1226 memcpy(tvlv_buff
, tvlv_value
, tvlv_value_len
);
1228 if (batadv_send_skb_to_orig(skb
, orig_node
, NULL
) == NET_XMIT_DROP
)
1231 batadv_orig_node_put(orig_node
);
1235 * batadv_get_vid - extract the VLAN identifier from skb if any
1236 * @skb: the buffer containing the packet
1237 * @header_len: length of the batman header preceding the ethernet header
1239 * Return: VID with the BATADV_VLAN_HAS_TAG flag when the packet embedded in the
1240 * skb is vlan tagged. Otherwise BATADV_NO_FLAGS.
1242 unsigned short batadv_get_vid(struct sk_buff
*skb
, size_t header_len
)
1244 struct ethhdr
*ethhdr
= (struct ethhdr
*)(skb
->data
+ header_len
);
1245 struct vlan_ethhdr
*vhdr
;
1248 if (ethhdr
->h_proto
!= htons(ETH_P_8021Q
))
1249 return BATADV_NO_FLAGS
;
1251 if (!pskb_may_pull(skb
, header_len
+ VLAN_ETH_HLEN
))
1252 return BATADV_NO_FLAGS
;
1254 vhdr
= (struct vlan_ethhdr
*)(skb
->data
+ header_len
);
1255 vid
= ntohs(vhdr
->h_vlan_TCI
) & VLAN_VID_MASK
;
1256 vid
|= BATADV_VLAN_HAS_TAG
;
1262 * batadv_vlan_ap_isola_get - return the AP isolation status for the given vlan
1263 * @bat_priv: the bat priv with all the soft interface information
1264 * @vid: the VLAN identifier for which the AP isolation attributed as to be
1267 * Return: true if AP isolation is on for the VLAN idenfied by vid, false
1270 bool batadv_vlan_ap_isola_get(struct batadv_priv
*bat_priv
, unsigned short vid
)
1272 bool ap_isolation_enabled
= false;
1273 struct batadv_softif_vlan
*vlan
;
1275 /* if the AP isolation is requested on a VLAN, then check for its
1276 * setting in the proper VLAN private data structure
1278 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
1280 ap_isolation_enabled
= atomic_read(&vlan
->ap_isolation
);
1281 batadv_softif_vlan_put(vlan
);
1284 return ap_isolation_enabled
;
1287 static int batadv_param_set_ra(const char *val
, const struct kernel_param
*kp
)
1289 struct batadv_algo_ops
*bat_algo_ops
;
1290 char *algo_name
= (char *)val
;
1291 size_t name_len
= strlen(algo_name
);
1293 if (name_len
> 0 && algo_name
[name_len
- 1] == '\n')
1294 algo_name
[name_len
- 1] = '\0';
1296 bat_algo_ops
= batadv_algo_get(algo_name
);
1297 if (!bat_algo_ops
) {
1298 pr_err("Routing algorithm '%s' is not supported\n", algo_name
);
1302 return param_set_copystring(algo_name
, kp
);
1305 static const struct kernel_param_ops batadv_param_ops_ra
= {
1306 .set
= batadv_param_set_ra
,
1307 .get
= param_get_string
,
1310 static struct kparam_string batadv_param_string_ra
= {
1311 .maxlen
= sizeof(batadv_routing_algo
),
1312 .string
= batadv_routing_algo
,
1315 module_param_cb(routing_algo
, &batadv_param_ops_ra
, &batadv_param_string_ra
,
1317 module_init(batadv_init
);
1318 module_exit(batadv_exit
);
1320 MODULE_LICENSE("GPL");
1322 MODULE_AUTHOR(BATADV_DRIVER_AUTHOR
);
1323 MODULE_DESCRIPTION(BATADV_DRIVER_DESC
);
1324 MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE
);
1325 MODULE_VERSION(BATADV_SOURCE_VERSION
);