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_neigh_cmp
||
573 !bat_algo_ops
->bat_neigh_is_similar_or_better
) {
574 pr_info("Routing algo '%s' does not implement required ops\n",
579 INIT_HLIST_NODE(&bat_algo_ops
->list
);
580 hlist_add_head(&bat_algo_ops
->list
, &batadv_algo_list
);
585 int batadv_algo_select(struct batadv_priv
*bat_priv
, char *name
)
587 struct batadv_algo_ops
*bat_algo_ops
;
589 bat_algo_ops
= batadv_algo_get(name
);
593 bat_priv
->bat_algo_ops
= bat_algo_ops
;
598 int batadv_algo_seq_print_text(struct seq_file
*seq
, void *offset
)
600 struct batadv_algo_ops
*bat_algo_ops
;
602 seq_puts(seq
, "Available routing algorithms:\n");
604 hlist_for_each_entry(bat_algo_ops
, &batadv_algo_list
, list
) {
605 seq_printf(seq
, " * %s\n", bat_algo_ops
->name
);
612 * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in
614 * @skb: skb pointing to fragmented socket buffers
615 * @payload_ptr: Pointer to position inside the head buffer of the skb
616 * marking the start of the data to be CRC'ed
618 * payload_ptr must always point to an address in the skb head buffer and not to
621 * Return: big endian crc32c of the checksummed data
623 __be32
batadv_skb_crc32(struct sk_buff
*skb
, u8
*payload_ptr
)
627 unsigned int to
= skb
->len
;
628 struct skb_seq_state st
;
631 unsigned int consumed
= 0;
633 from
= (unsigned int)(payload_ptr
- skb
->data
);
635 skb_prepare_seq_read(skb
, from
, to
, &st
);
636 while ((len
= skb_seq_read(consumed
, &data
, &st
)) != 0) {
637 crc
= crc32c(crc
, data
, len
);
645 * batadv_tvlv_handler_release - release tvlv handler from lists and queue for
646 * free after rcu grace period
647 * @ref: kref pointer of the tvlv
649 static void batadv_tvlv_handler_release(struct kref
*ref
)
651 struct batadv_tvlv_handler
*tvlv_handler
;
653 tvlv_handler
= container_of(ref
, struct batadv_tvlv_handler
, refcount
);
654 kfree_rcu(tvlv_handler
, rcu
);
658 * batadv_tvlv_handler_put - decrement the tvlv container refcounter and
659 * possibly release it
660 * @tvlv_handler: the tvlv handler to free
662 static void batadv_tvlv_handler_put(struct batadv_tvlv_handler
*tvlv_handler
)
664 kref_put(&tvlv_handler
->refcount
, batadv_tvlv_handler_release
);
668 * batadv_tvlv_handler_get - retrieve tvlv handler from the tvlv handler list
669 * based on the provided type and version (both need to match)
670 * @bat_priv: the bat priv with all the soft interface information
671 * @type: tvlv handler type to look for
672 * @version: tvlv handler version to look for
674 * Return: tvlv handler if found or NULL otherwise.
676 static struct batadv_tvlv_handler
*
677 batadv_tvlv_handler_get(struct batadv_priv
*bat_priv
, u8 type
, u8 version
)
679 struct batadv_tvlv_handler
*tvlv_handler_tmp
, *tvlv_handler
= NULL
;
682 hlist_for_each_entry_rcu(tvlv_handler_tmp
,
683 &bat_priv
->tvlv
.handler_list
, list
) {
684 if (tvlv_handler_tmp
->type
!= type
)
687 if (tvlv_handler_tmp
->version
!= version
)
690 if (!kref_get_unless_zero(&tvlv_handler_tmp
->refcount
))
693 tvlv_handler
= tvlv_handler_tmp
;
702 * batadv_tvlv_container_release - release tvlv from lists and free
703 * @ref: kref pointer of the tvlv
705 static void batadv_tvlv_container_release(struct kref
*ref
)
707 struct batadv_tvlv_container
*tvlv
;
709 tvlv
= container_of(ref
, struct batadv_tvlv_container
, refcount
);
714 * batadv_tvlv_container_put - decrement the tvlv container refcounter and
715 * possibly release it
716 * @tvlv: the tvlv container to free
718 static void batadv_tvlv_container_put(struct batadv_tvlv_container
*tvlv
)
720 kref_put(&tvlv
->refcount
, batadv_tvlv_container_release
);
724 * batadv_tvlv_container_get - retrieve tvlv container from the tvlv container
725 * list based on the provided type and version (both need to match)
726 * @bat_priv: the bat priv with all the soft interface information
727 * @type: tvlv container type to look for
728 * @version: tvlv container version to look for
730 * Has to be called with the appropriate locks being acquired
731 * (tvlv.container_list_lock).
733 * Return: tvlv container if found or NULL otherwise.
735 static struct batadv_tvlv_container
*
736 batadv_tvlv_container_get(struct batadv_priv
*bat_priv
, u8 type
, u8 version
)
738 struct batadv_tvlv_container
*tvlv_tmp
, *tvlv
= NULL
;
740 lockdep_assert_held(&bat_priv
->tvlv
.container_list_lock
);
742 hlist_for_each_entry(tvlv_tmp
, &bat_priv
->tvlv
.container_list
, list
) {
743 if (tvlv_tmp
->tvlv_hdr
.type
!= type
)
746 if (tvlv_tmp
->tvlv_hdr
.version
!= version
)
749 kref_get(&tvlv_tmp
->refcount
);
758 * batadv_tvlv_container_list_size - calculate the size of the tvlv container
760 * @bat_priv: the bat priv with all the soft interface information
762 * Has to be called with the appropriate locks being acquired
763 * (tvlv.container_list_lock).
765 * Return: size of all currently registered tvlv containers in bytes.
767 static u16
batadv_tvlv_container_list_size(struct batadv_priv
*bat_priv
)
769 struct batadv_tvlv_container
*tvlv
;
772 lockdep_assert_held(&bat_priv
->tvlv
.container_list_lock
);
774 hlist_for_each_entry(tvlv
, &bat_priv
->tvlv
.container_list
, list
) {
775 tvlv_len
+= sizeof(struct batadv_tvlv_hdr
);
776 tvlv_len
+= ntohs(tvlv
->tvlv_hdr
.len
);
783 * batadv_tvlv_container_remove - remove tvlv container from the tvlv container
785 * @bat_priv: the bat priv with all the soft interface information
786 * @tvlv: the to be removed tvlv container
788 * Has to be called with the appropriate locks being acquired
789 * (tvlv.container_list_lock).
791 static void batadv_tvlv_container_remove(struct batadv_priv
*bat_priv
,
792 struct batadv_tvlv_container
*tvlv
)
794 lockdep_assert_held(&bat_priv
->tvlv
.container_list_lock
);
799 hlist_del(&tvlv
->list
);
801 /* first call to decrement the counter, second call to free */
802 batadv_tvlv_container_put(tvlv
);
803 batadv_tvlv_container_put(tvlv
);
807 * batadv_tvlv_container_unregister - unregister tvlv container based on the
808 * provided type and version (both need to match)
809 * @bat_priv: the bat priv with all the soft interface information
810 * @type: tvlv container type to unregister
811 * @version: tvlv container type to unregister
813 void batadv_tvlv_container_unregister(struct batadv_priv
*bat_priv
,
816 struct batadv_tvlv_container
*tvlv
;
818 spin_lock_bh(&bat_priv
->tvlv
.container_list_lock
);
819 tvlv
= batadv_tvlv_container_get(bat_priv
, type
, version
);
820 batadv_tvlv_container_remove(bat_priv
, tvlv
);
821 spin_unlock_bh(&bat_priv
->tvlv
.container_list_lock
);
825 * batadv_tvlv_container_register - register tvlv type, version and content
826 * to be propagated with each (primary interface) OGM
827 * @bat_priv: the bat priv with all the soft interface information
828 * @type: tvlv container type
829 * @version: tvlv container version
830 * @tvlv_value: tvlv container content
831 * @tvlv_value_len: tvlv container content length
833 * If a container of the same type and version was already registered the new
834 * content is going to replace the old one.
836 void batadv_tvlv_container_register(struct batadv_priv
*bat_priv
,
838 void *tvlv_value
, u16 tvlv_value_len
)
840 struct batadv_tvlv_container
*tvlv_old
, *tvlv_new
;
845 tvlv_new
= kzalloc(sizeof(*tvlv_new
) + tvlv_value_len
, GFP_ATOMIC
);
849 tvlv_new
->tvlv_hdr
.version
= version
;
850 tvlv_new
->tvlv_hdr
.type
= type
;
851 tvlv_new
->tvlv_hdr
.len
= htons(tvlv_value_len
);
853 memcpy(tvlv_new
+ 1, tvlv_value
, ntohs(tvlv_new
->tvlv_hdr
.len
));
854 INIT_HLIST_NODE(&tvlv_new
->list
);
855 kref_init(&tvlv_new
->refcount
);
857 spin_lock_bh(&bat_priv
->tvlv
.container_list_lock
);
858 tvlv_old
= batadv_tvlv_container_get(bat_priv
, type
, version
);
859 batadv_tvlv_container_remove(bat_priv
, tvlv_old
);
860 hlist_add_head(&tvlv_new
->list
, &bat_priv
->tvlv
.container_list
);
861 spin_unlock_bh(&bat_priv
->tvlv
.container_list_lock
);
865 * batadv_tvlv_realloc_packet_buff - reallocate packet buffer to accommodate
866 * requested packet size
867 * @packet_buff: packet buffer
868 * @packet_buff_len: packet buffer size
869 * @min_packet_len: requested packet minimum size
870 * @additional_packet_len: requested additional packet size on top of minimum
873 * Return: true of the packet buffer could be changed to the requested size,
876 static bool batadv_tvlv_realloc_packet_buff(unsigned char **packet_buff
,
877 int *packet_buff_len
,
879 int additional_packet_len
)
881 unsigned char *new_buff
;
883 new_buff
= kmalloc(min_packet_len
+ additional_packet_len
, GFP_ATOMIC
);
885 /* keep old buffer if kmalloc should fail */
889 memcpy(new_buff
, *packet_buff
, min_packet_len
);
891 *packet_buff
= new_buff
;
892 *packet_buff_len
= min_packet_len
+ additional_packet_len
;
898 * batadv_tvlv_container_ogm_append - append tvlv container content to given
900 * @bat_priv: the bat priv with all the soft interface information
901 * @packet_buff: ogm packet buffer
902 * @packet_buff_len: ogm packet buffer size including ogm header and tvlv
904 * @packet_min_len: ogm header size to be preserved for the OGM itself
906 * The ogm packet might be enlarged or shrunk depending on the current size
907 * and the size of the to-be-appended tvlv containers.
909 * Return: size of all appended tvlv containers in bytes.
911 u16
batadv_tvlv_container_ogm_append(struct batadv_priv
*bat_priv
,
912 unsigned char **packet_buff
,
913 int *packet_buff_len
, int packet_min_len
)
915 struct batadv_tvlv_container
*tvlv
;
916 struct batadv_tvlv_hdr
*tvlv_hdr
;
921 spin_lock_bh(&bat_priv
->tvlv
.container_list_lock
);
922 tvlv_value_len
= batadv_tvlv_container_list_size(bat_priv
);
924 ret
= batadv_tvlv_realloc_packet_buff(packet_buff
, packet_buff_len
,
925 packet_min_len
, tvlv_value_len
);
933 tvlv_value
= (*packet_buff
) + packet_min_len
;
935 hlist_for_each_entry(tvlv
, &bat_priv
->tvlv
.container_list
, list
) {
936 tvlv_hdr
= tvlv_value
;
937 tvlv_hdr
->type
= tvlv
->tvlv_hdr
.type
;
938 tvlv_hdr
->version
= tvlv
->tvlv_hdr
.version
;
939 tvlv_hdr
->len
= tvlv
->tvlv_hdr
.len
;
940 tvlv_value
= tvlv_hdr
+ 1;
941 memcpy(tvlv_value
, tvlv
+ 1, ntohs(tvlv
->tvlv_hdr
.len
));
942 tvlv_value
= (u8
*)tvlv_value
+ ntohs(tvlv
->tvlv_hdr
.len
);
946 spin_unlock_bh(&bat_priv
->tvlv
.container_list_lock
);
947 return tvlv_value_len
;
951 * batadv_tvlv_call_handler - parse the given tvlv buffer to call the
952 * appropriate handlers
953 * @bat_priv: the bat priv with all the soft interface information
954 * @tvlv_handler: tvlv callback function handling the tvlv content
955 * @ogm_source: flag indicating whether the tvlv is an ogm or a unicast packet
956 * @orig_node: orig node emitting the ogm packet
957 * @src: source mac address of the unicast packet
958 * @dst: destination mac address of the unicast packet
959 * @tvlv_value: tvlv content
960 * @tvlv_value_len: tvlv content length
962 * Return: success if handler was not found or the return value of the handler
965 static int batadv_tvlv_call_handler(struct batadv_priv
*bat_priv
,
966 struct batadv_tvlv_handler
*tvlv_handler
,
968 struct batadv_orig_node
*orig_node
,
970 void *tvlv_value
, u16 tvlv_value_len
)
973 return NET_RX_SUCCESS
;
976 if (!tvlv_handler
->ogm_handler
)
977 return NET_RX_SUCCESS
;
980 return NET_RX_SUCCESS
;
982 tvlv_handler
->ogm_handler(bat_priv
, orig_node
,
984 tvlv_value
, tvlv_value_len
);
985 tvlv_handler
->flags
|= BATADV_TVLV_HANDLER_OGM_CALLED
;
988 return NET_RX_SUCCESS
;
991 return NET_RX_SUCCESS
;
993 if (!tvlv_handler
->unicast_handler
)
994 return NET_RX_SUCCESS
;
996 return tvlv_handler
->unicast_handler(bat_priv
, src
,
1001 return NET_RX_SUCCESS
;
1005 * batadv_tvlv_containers_process - parse the given tvlv buffer to call the
1006 * appropriate handlers
1007 * @bat_priv: the bat priv with all the soft interface information
1008 * @ogm_source: flag indicating whether the tvlv is an ogm or a unicast packet
1009 * @orig_node: orig node emitting the ogm packet
1010 * @src: source mac address of the unicast packet
1011 * @dst: destination mac address of the unicast packet
1012 * @tvlv_value: tvlv content
1013 * @tvlv_value_len: tvlv content length
1015 * Return: success when processing an OGM or the return value of all called
1016 * handler callbacks.
1018 int batadv_tvlv_containers_process(struct batadv_priv
*bat_priv
,
1020 struct batadv_orig_node
*orig_node
,
1022 void *tvlv_value
, u16 tvlv_value_len
)
1024 struct batadv_tvlv_handler
*tvlv_handler
;
1025 struct batadv_tvlv_hdr
*tvlv_hdr
;
1026 u16 tvlv_value_cont_len
;
1027 u8 cifnotfound
= BATADV_TVLV_HANDLER_OGM_CIFNOTFND
;
1028 int ret
= NET_RX_SUCCESS
;
1030 while (tvlv_value_len
>= sizeof(*tvlv_hdr
)) {
1031 tvlv_hdr
= tvlv_value
;
1032 tvlv_value_cont_len
= ntohs(tvlv_hdr
->len
);
1033 tvlv_value
= tvlv_hdr
+ 1;
1034 tvlv_value_len
-= sizeof(*tvlv_hdr
);
1036 if (tvlv_value_cont_len
> tvlv_value_len
)
1039 tvlv_handler
= batadv_tvlv_handler_get(bat_priv
,
1043 ret
|= batadv_tvlv_call_handler(bat_priv
, tvlv_handler
,
1044 ogm_source
, orig_node
,
1045 src
, dst
, tvlv_value
,
1046 tvlv_value_cont_len
);
1048 batadv_tvlv_handler_put(tvlv_handler
);
1049 tvlv_value
= (u8
*)tvlv_value
+ tvlv_value_cont_len
;
1050 tvlv_value_len
-= tvlv_value_cont_len
;
1057 hlist_for_each_entry_rcu(tvlv_handler
,
1058 &bat_priv
->tvlv
.handler_list
, list
) {
1059 if ((tvlv_handler
->flags
& BATADV_TVLV_HANDLER_OGM_CIFNOTFND
) &&
1060 !(tvlv_handler
->flags
& BATADV_TVLV_HANDLER_OGM_CALLED
))
1061 tvlv_handler
->ogm_handler(bat_priv
, orig_node
,
1062 cifnotfound
, NULL
, 0);
1064 tvlv_handler
->flags
&= ~BATADV_TVLV_HANDLER_OGM_CALLED
;
1068 return NET_RX_SUCCESS
;
1072 * batadv_tvlv_ogm_receive - process an incoming ogm and call the appropriate
1074 * @bat_priv: the bat priv with all the soft interface information
1075 * @batadv_ogm_packet: ogm packet containing the tvlv containers
1076 * @orig_node: orig node emitting the ogm packet
1078 void batadv_tvlv_ogm_receive(struct batadv_priv
*bat_priv
,
1079 struct batadv_ogm_packet
*batadv_ogm_packet
,
1080 struct batadv_orig_node
*orig_node
)
1085 if (!batadv_ogm_packet
)
1088 tvlv_value_len
= ntohs(batadv_ogm_packet
->tvlv_len
);
1089 if (!tvlv_value_len
)
1092 tvlv_value
= batadv_ogm_packet
+ 1;
1094 batadv_tvlv_containers_process(bat_priv
, true, orig_node
, NULL
, NULL
,
1095 tvlv_value
, tvlv_value_len
);
1099 * batadv_tvlv_handler_register - register tvlv handler based on the provided
1100 * type and version (both need to match) for ogm tvlv payload and/or unicast
1102 * @bat_priv: the bat priv with all the soft interface information
1103 * @optr: ogm tvlv handler callback function. This function receives the orig
1104 * node, flags and the tvlv content as argument to process.
1105 * @uptr: unicast tvlv handler callback function. This function receives the
1106 * source & destination of the unicast packet as well as the tvlv content
1108 * @type: tvlv handler type to be registered
1109 * @version: tvlv handler version to be registered
1110 * @flags: flags to enable or disable TVLV API behavior
1112 void batadv_tvlv_handler_register(struct batadv_priv
*bat_priv
,
1113 void (*optr
)(struct batadv_priv
*bat_priv
,
1114 struct batadv_orig_node
*orig
,
1117 u16 tvlv_value_len
),
1118 int (*uptr
)(struct batadv_priv
*bat_priv
,
1121 u16 tvlv_value_len
),
1122 u8 type
, u8 version
, u8 flags
)
1124 struct batadv_tvlv_handler
*tvlv_handler
;
1126 tvlv_handler
= batadv_tvlv_handler_get(bat_priv
, type
, version
);
1128 batadv_tvlv_handler_put(tvlv_handler
);
1132 tvlv_handler
= kzalloc(sizeof(*tvlv_handler
), GFP_ATOMIC
);
1136 tvlv_handler
->ogm_handler
= optr
;
1137 tvlv_handler
->unicast_handler
= uptr
;
1138 tvlv_handler
->type
= type
;
1139 tvlv_handler
->version
= version
;
1140 tvlv_handler
->flags
= flags
;
1141 kref_init(&tvlv_handler
->refcount
);
1142 INIT_HLIST_NODE(&tvlv_handler
->list
);
1144 spin_lock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1145 hlist_add_head_rcu(&tvlv_handler
->list
, &bat_priv
->tvlv
.handler_list
);
1146 spin_unlock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1150 * batadv_tvlv_handler_unregister - unregister tvlv handler based on the
1151 * provided type and version (both need to match)
1152 * @bat_priv: the bat priv with all the soft interface information
1153 * @type: tvlv handler type to be unregistered
1154 * @version: tvlv handler version to be unregistered
1156 void batadv_tvlv_handler_unregister(struct batadv_priv
*bat_priv
,
1157 u8 type
, u8 version
)
1159 struct batadv_tvlv_handler
*tvlv_handler
;
1161 tvlv_handler
= batadv_tvlv_handler_get(bat_priv
, type
, version
);
1165 batadv_tvlv_handler_put(tvlv_handler
);
1166 spin_lock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1167 hlist_del_rcu(&tvlv_handler
->list
);
1168 spin_unlock_bh(&bat_priv
->tvlv
.handler_list_lock
);
1169 batadv_tvlv_handler_put(tvlv_handler
);
1173 * batadv_tvlv_unicast_send - send a unicast packet with tvlv payload to the
1175 * @bat_priv: the bat priv with all the soft interface information
1176 * @src: source mac address of the unicast packet
1177 * @dst: destination mac address of the unicast packet
1179 * @version: tvlv version
1180 * @tvlv_value: tvlv content
1181 * @tvlv_value_len: tvlv content length
1183 void batadv_tvlv_unicast_send(struct batadv_priv
*bat_priv
, u8
*src
,
1184 u8
*dst
, u8 type
, u8 version
,
1185 void *tvlv_value
, u16 tvlv_value_len
)
1187 struct batadv_unicast_tvlv_packet
*unicast_tvlv_packet
;
1188 struct batadv_tvlv_hdr
*tvlv_hdr
;
1189 struct batadv_orig_node
*orig_node
;
1190 struct sk_buff
*skb
;
1191 unsigned char *tvlv_buff
;
1192 unsigned int tvlv_len
;
1193 ssize_t hdr_len
= sizeof(*unicast_tvlv_packet
);
1195 orig_node
= batadv_orig_hash_find(bat_priv
, dst
);
1199 tvlv_len
= sizeof(*tvlv_hdr
) + tvlv_value_len
;
1201 skb
= netdev_alloc_skb_ip_align(NULL
, ETH_HLEN
+ hdr_len
+ tvlv_len
);
1205 skb
->priority
= TC_PRIO_CONTROL
;
1206 skb_reserve(skb
, ETH_HLEN
);
1207 tvlv_buff
= skb_put(skb
, sizeof(*unicast_tvlv_packet
) + tvlv_len
);
1208 unicast_tvlv_packet
= (struct batadv_unicast_tvlv_packet
*)tvlv_buff
;
1209 unicast_tvlv_packet
->packet_type
= BATADV_UNICAST_TVLV
;
1210 unicast_tvlv_packet
->version
= BATADV_COMPAT_VERSION
;
1211 unicast_tvlv_packet
->ttl
= BATADV_TTL
;
1212 unicast_tvlv_packet
->reserved
= 0;
1213 unicast_tvlv_packet
->tvlv_len
= htons(tvlv_len
);
1214 unicast_tvlv_packet
->align
= 0;
1215 ether_addr_copy(unicast_tvlv_packet
->src
, src
);
1216 ether_addr_copy(unicast_tvlv_packet
->dst
, dst
);
1218 tvlv_buff
= (unsigned char *)(unicast_tvlv_packet
+ 1);
1219 tvlv_hdr
= (struct batadv_tvlv_hdr
*)tvlv_buff
;
1220 tvlv_hdr
->version
= version
;
1221 tvlv_hdr
->type
= type
;
1222 tvlv_hdr
->len
= htons(tvlv_value_len
);
1223 tvlv_buff
+= sizeof(*tvlv_hdr
);
1224 memcpy(tvlv_buff
, tvlv_value
, tvlv_value_len
);
1226 if (batadv_send_skb_to_orig(skb
, orig_node
, NULL
) == NET_XMIT_DROP
)
1229 batadv_orig_node_put(orig_node
);
1233 * batadv_get_vid - extract the VLAN identifier from skb if any
1234 * @skb: the buffer containing the packet
1235 * @header_len: length of the batman header preceding the ethernet header
1237 * Return: VID with the BATADV_VLAN_HAS_TAG flag when the packet embedded in the
1238 * skb is vlan tagged. Otherwise BATADV_NO_FLAGS.
1240 unsigned short batadv_get_vid(struct sk_buff
*skb
, size_t header_len
)
1242 struct ethhdr
*ethhdr
= (struct ethhdr
*)(skb
->data
+ header_len
);
1243 struct vlan_ethhdr
*vhdr
;
1246 if (ethhdr
->h_proto
!= htons(ETH_P_8021Q
))
1247 return BATADV_NO_FLAGS
;
1249 if (!pskb_may_pull(skb
, header_len
+ VLAN_ETH_HLEN
))
1250 return BATADV_NO_FLAGS
;
1252 vhdr
= (struct vlan_ethhdr
*)(skb
->data
+ header_len
);
1253 vid
= ntohs(vhdr
->h_vlan_TCI
) & VLAN_VID_MASK
;
1254 vid
|= BATADV_VLAN_HAS_TAG
;
1260 * batadv_vlan_ap_isola_get - return the AP isolation status for the given vlan
1261 * @bat_priv: the bat priv with all the soft interface information
1262 * @vid: the VLAN identifier for which the AP isolation attributed as to be
1265 * Return: true if AP isolation is on for the VLAN idenfied by vid, false
1268 bool batadv_vlan_ap_isola_get(struct batadv_priv
*bat_priv
, unsigned short vid
)
1270 bool ap_isolation_enabled
= false;
1271 struct batadv_softif_vlan
*vlan
;
1273 /* if the AP isolation is requested on a VLAN, then check for its
1274 * setting in the proper VLAN private data structure
1276 vlan
= batadv_softif_vlan_get(bat_priv
, vid
);
1278 ap_isolation_enabled
= atomic_read(&vlan
->ap_isolation
);
1279 batadv_softif_vlan_put(vlan
);
1282 return ap_isolation_enabled
;
1285 static int batadv_param_set_ra(const char *val
, const struct kernel_param
*kp
)
1287 struct batadv_algo_ops
*bat_algo_ops
;
1288 char *algo_name
= (char *)val
;
1289 size_t name_len
= strlen(algo_name
);
1291 if (name_len
> 0 && algo_name
[name_len
- 1] == '\n')
1292 algo_name
[name_len
- 1] = '\0';
1294 bat_algo_ops
= batadv_algo_get(algo_name
);
1295 if (!bat_algo_ops
) {
1296 pr_err("Routing algorithm '%s' is not supported\n", algo_name
);
1300 return param_set_copystring(algo_name
, kp
);
1303 static const struct kernel_param_ops batadv_param_ops_ra
= {
1304 .set
= batadv_param_set_ra
,
1305 .get
= param_get_string
,
1308 static struct kparam_string batadv_param_string_ra
= {
1309 .maxlen
= sizeof(batadv_routing_algo
),
1310 .string
= batadv_routing_algo
,
1313 module_param_cb(routing_algo
, &batadv_param_ops_ra
, &batadv_param_string_ra
,
1315 module_init(batadv_init
);
1316 module_exit(batadv_exit
);
1318 MODULE_LICENSE("GPL");
1320 MODULE_AUTHOR(BATADV_DRIVER_AUTHOR
);
1321 MODULE_DESCRIPTION(BATADV_DRIVER_DESC
);
1322 MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE
);
1323 MODULE_VERSION(BATADV_SOURCE_VERSION
);