1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2007-2018 B.A.T.M.A.N. contributors:
3 *
4 * Marek Lindner, Simon Wunderlich
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of version 2 of the GNU General Public
8 * License as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, see <http://www.gnu.org/licenses/>.
17 */
18
19 #include "main.h"
20
21 #include <linux/atomic.h>
22 #include <linux/build_bug.h>
23 #include <linux/byteorder/generic.h>
24 #include <linux/crc32c.h>
25 #include <linux/errno.h>
26 #include <linux/genetlink.h>
27 #include <linux/gfp.h>
28 #include <linux/if_ether.h>
29 #include <linux/if_vlan.h>
30 #include <linux/init.h>
31 #include <linux/ip.h>
32 #include <linux/ipv6.h>
33 #include <linux/kernel.h>
34 #include <linux/kref.h>
35 #include <linux/list.h>
36 #include <linux/module.h>
37 #include <linux/netdevice.h>
38 #include <linux/printk.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/spinlock.h>
44 #include <linux/stddef.h>
45 #include <linux/string.h>
46 #include <linux/workqueue.h>
47 #include <net/dsfield.h>
48 #include <net/rtnetlink.h>
49 #include <uapi/linux/batadv_packet.h>
50 #include <uapi/linux/batman_adv.h>
51
52 #include "bat_algo.h"
53 #include "bat_iv_ogm.h"
54 #include "bat_v.h"
55 #include "bridge_loop_avoidance.h"
56 #include "debugfs.h"
57 #include "distributed-arp-table.h"
58 #include "gateway_client.h"
59 #include "gateway_common.h"
60 #include "hard-interface.h"
61 #include "icmp_socket.h"
62 #include "log.h"
63 #include "multicast.h"
64 #include "netlink.h"
65 #include "network-coding.h"
66 #include "originator.h"
67 #include "routing.h"
68 #include "send.h"
69 #include "soft-interface.h"
70 #include "tp_meter.h"
71 #include "translation-table.h"
72
73 /* List manipulations on hardif_list have to be rtnl_lock()'ed,
74 * list traversals just rcu-locked
75 */
76 struct list_head batadv_hardif_list;
77 static int (*batadv_rx_handler[256])(struct sk_buff *skb,
78 struct batadv_hard_iface *recv_if);
79
80 unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
81
82 struct workqueue_struct *batadv_event_workqueue;
83
84 static void batadv_recv_handler_init(void);
85
86 static int __init batadv_init(void)
87 {
88 int ret;
89
90 ret = batadv_tt_cache_init();
91 if (ret < 0)
92 return ret;
93
94 INIT_LIST_HEAD(&batadv_hardif_list);
95 batadv_algo_init();
96
97 batadv_recv_handler_init();
98
99 batadv_v_init();
100 batadv_iv_init();
101 batadv_nc_init();
102 batadv_tp_meter_init();
103
104 batadv_event_workqueue = create_singlethread_workqueue("bat_events");
105 if (!batadv_event_workqueue)
106 goto err_create_wq;
107
108 batadv_socket_init();
109 batadv_debugfs_init();
110
111 register_netdevice_notifier(&batadv_hard_if_notifier);
112 rtnl_link_register(&batadv_link_ops);
113 batadv_netlink_register();
114
115 pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n",
116 BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION);
117
118 return 0;
119
120 err_create_wq:
121 batadv_tt_cache_destroy();
122
123 return -ENOMEM;
124 }
125
126 static void __exit batadv_exit(void)
127 {
128 batadv_debugfs_destroy();
129 batadv_netlink_unregister();
130 rtnl_link_unregister(&batadv_link_ops);
131 unregister_netdevice_notifier(&batadv_hard_if_notifier);
132 batadv_hardif_remove_interfaces();
133
134 flush_workqueue(batadv_event_workqueue);
135 destroy_workqueue(batadv_event_workqueue);
136 batadv_event_workqueue = NULL;
137
138 rcu_barrier();
139
140 batadv_tt_cache_destroy();
141 }
142
143 /**
144 * batadv_mesh_init() - Initialize soft interface
145 * @soft_iface: netdev struct of the soft interface
146 *
147 * Return: 0 on success or negative error number in case of failure
148 */
149 int batadv_mesh_init(struct net_device *soft_iface)
150 {
151 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
152 int ret;
153
154 spin_lock_init(&bat_priv->forw_bat_list_lock);
155 spin_lock_init(&bat_priv->forw_bcast_list_lock);
156 spin_lock_init(&bat_priv->tt.changes_list_lock);
157 spin_lock_init(&bat_priv->tt.req_list_lock);
158 spin_lock_init(&bat_priv->tt.roam_list_lock);
159 spin_lock_init(&bat_priv->tt.last_changeset_lock);
160 spin_lock_init(&bat_priv->tt.commit_lock);
161 spin_lock_init(&bat_priv->gw.list_lock);
162 #ifdef CONFIG_BATMAN_ADV_MCAST
163 spin_lock_init(&bat_priv->mcast.want_lists_lock);
164 #endif
165 spin_lock_init(&bat_priv->tvlv.container_list_lock);
166 spin_lock_init(&bat_priv->tvlv.handler_list_lock);
167 spin_lock_init(&bat_priv->softif_vlan_list_lock);
168 spin_lock_init(&bat_priv->tp_list_lock);
169
170 INIT_HLIST_HEAD(&bat_priv->forw_bat_list);
171 INIT_HLIST_HEAD(&bat_priv->forw_bcast_list);
172 INIT_HLIST_HEAD(&bat_priv->gw.gateway_list);
173 #ifdef CONFIG_BATMAN_ADV_MCAST
174 INIT_HLIST_HEAD(&bat_priv->mcast.want_all_unsnoopables_list);
175 INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv4_list);
176 INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv6_list);
177 #endif
178 INIT_LIST_HEAD(&bat_priv->tt.changes_list);
179 INIT_HLIST_HEAD(&bat_priv->tt.req_list);
180 INIT_LIST_HEAD(&bat_priv->tt.roam_list);
181 #ifdef CONFIG_BATMAN_ADV_MCAST
182 INIT_HLIST_HEAD(&bat_priv->mcast.mla_list);
183 #endif
184 INIT_HLIST_HEAD(&bat_priv->tvlv.container_list);
185 INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list);
186 INIT_HLIST_HEAD(&bat_priv->softif_vlan_list);
187 INIT_HLIST_HEAD(&bat_priv->tp_list);
188
189 ret = batadv_v_mesh_init(bat_priv);
190 if (ret < 0)
191 goto err;
192
193 ret = batadv_originator_init(bat_priv);
194 if (ret < 0)
195 goto err;
196
197 ret = batadv_tt_init(bat_priv);
198 if (ret < 0)
199 goto err;
200
201 ret = batadv_bla_init(bat_priv);
202 if (ret < 0)
203 goto err;
204
205 ret = batadv_dat_init(bat_priv);
206 if (ret < 0)
207 goto err;
208
209 ret = batadv_nc_mesh_init(bat_priv);
210 if (ret < 0)
211 goto err;
212
213 batadv_gw_init(bat_priv);
214 batadv_mcast_init(bat_priv);
215
216 atomic_set(&bat_priv->gw.reselect, 0);
217 atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE);
218
219 return 0;
220
221 err:
222 batadv_mesh_free(soft_iface);
223 return ret;
224 }
225
226 /**
227 * batadv_mesh_free() - Deinitialize soft interface
228 * @soft_iface: netdev struct of the soft interface
229 */
230 void batadv_mesh_free(struct net_device *soft_iface)
231 {
232 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
233
234 atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING);
235
236 batadv_purge_outstanding_packets(bat_priv, NULL);
237
238 batadv_gw_node_free(bat_priv);
239
240 batadv_v_mesh_free(bat_priv);
241 batadv_nc_mesh_free(bat_priv);
242 batadv_dat_free(bat_priv);
243 batadv_bla_free(bat_priv);
244
245 batadv_mcast_free(bat_priv);
246
247 /* Free the TT and the originator tables only after having terminated
248 * all the other depending components which may use these structures for
249 * their purposes.
250 */
251 batadv_tt_free(bat_priv);
252
253 /* Since the originator table clean up routine is accessing the TT
254 * tables as well, it has to be invoked after the TT tables have been
255 * freed and marked as empty. This ensures that no cleanup RCU callbacks
256 * accessing the TT data are scheduled for later execution.
257 */
258 batadv_originator_free(bat_priv);
259
260 batadv_gw_free(bat_priv);
261
262 free_percpu(bat_priv->bat_counters);
263 bat_priv->bat_counters = NULL;
264
265 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
266 }
267
268 /**
269 * batadv_is_my_mac() - check if the given mac address belongs to any of the
270 * real interfaces in the current mesh
271 * @bat_priv: the bat priv with all the soft interface information
272 * @addr: the address to check
273 *
274 * Return: 'true' if the mac address was found, false otherwise.
275 */
276 bool batadv_is_my_mac(struct batadv_priv *bat_priv, const u8 *addr)
277 {
278 const struct batadv_hard_iface *hard_iface;
279 bool is_my_mac = false;
280
281 rcu_read_lock();
282 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
283 if (hard_iface->if_status != BATADV_IF_ACTIVE)
284 continue;
285
286 if (hard_iface->soft_iface != bat_priv->soft_iface)
287 continue;
288
289 if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) {
290 is_my_mac = true;
291 break;
292 }
293 }
294 rcu_read_unlock();
295 return is_my_mac;
296 }
297
298 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
299 /**
300 * batadv_seq_print_text_primary_if_get() - called from debugfs table printing
301 * function that requires the primary interface
302 * @seq: debugfs table seq_file struct
303 *
304 * Return: primary interface if found or NULL otherwise.
305 */
306 struct batadv_hard_iface *
307 batadv_seq_print_text_primary_if_get(struct seq_file *seq)
308 {
309 struct net_device *net_dev = (struct net_device *)seq->private;
310 struct batadv_priv *bat_priv = netdev_priv(net_dev);
311 struct batadv_hard_iface *primary_if;
312
313 primary_if = batadv_primary_if_get_selected(bat_priv);
314
315 if (!primary_if) {
316 seq_printf(seq,
317 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
318 net_dev->name);
319 goto out;
320 }
321
322 if (primary_if->if_status == BATADV_IF_ACTIVE)
323 goto out;
324
325 seq_printf(seq,
326 "BATMAN mesh %s disabled - primary interface not active\n",
327 net_dev->name);
328 batadv_hardif_put(primary_if);
329 primary_if = NULL;
330
331 out:
332 return primary_if;
333 }
334 #endif
335
336 /**
337 * batadv_max_header_len() - calculate maximum encapsulation overhead for a
338 * payload packet
339 *
340 * Return: the maximum encapsulation overhead in bytes.
341 */
342 int batadv_max_header_len(void)
343 {
344 int header_len = 0;
345
346 header_len = max_t(int, header_len,
347 sizeof(struct batadv_unicast_packet));
348 header_len = max_t(int, header_len,
349 sizeof(struct batadv_unicast_4addr_packet));
350 header_len = max_t(int, header_len,
351 sizeof(struct batadv_bcast_packet));
352
353 #ifdef CONFIG_BATMAN_ADV_NC
354 header_len = max_t(int, header_len,
355 sizeof(struct batadv_coded_packet));
356 #endif
357
358 return header_len + ETH_HLEN;
359 }
360
361 /**
362 * batadv_skb_set_priority() - sets skb priority according to packet content
363 * @skb: the packet to be sent
364 * @offset: offset to the packet content
365 *
366 * This function sets a value between 256 and 263 (802.1d priority), which
367 * can be interpreted by the cfg80211 or other drivers.
368 */
369 void batadv_skb_set_priority(struct sk_buff *skb, int offset)
370 {
371 struct iphdr ip_hdr_tmp, *ip_hdr;
372 struct ipv6hdr ip6_hdr_tmp, *ip6_hdr;
373 struct ethhdr ethhdr_tmp, *ethhdr;
374 struct vlan_ethhdr *vhdr, vhdr_tmp;
375 u32 prio;
376
377 /* already set, do nothing */
378 if (skb->priority >= 256 && skb->priority <= 263)
379 return;
380
381 ethhdr = skb_header_pointer(skb, offset, sizeof(*ethhdr), ðhdr_tmp);
382 if (!ethhdr)
383 return;
384
385 switch (ethhdr->h_proto) {
386 case htons(ETH_P_8021Q):
387 vhdr = skb_header_pointer(skb, offset + sizeof(*vhdr),
388 sizeof(*vhdr), &vhdr_tmp);
389 if (!vhdr)
390 return;
391 prio = ntohs(vhdr->h_vlan_TCI) & VLAN_PRIO_MASK;
392 prio = prio >> VLAN_PRIO_SHIFT;
393 break;
394 case htons(ETH_P_IP):
395 ip_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr),
396 sizeof(*ip_hdr), &ip_hdr_tmp);
397 if (!ip_hdr)
398 return;
399 prio = (ipv4_get_dsfield(ip_hdr) & 0xfc) >> 5;
400 break;
401 case htons(ETH_P_IPV6):
402 ip6_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr),
403 sizeof(*ip6_hdr), &ip6_hdr_tmp);
404 if (!ip6_hdr)
405 return;
406 prio = (ipv6_get_dsfield(ip6_hdr) & 0xfc) >> 5;
407 break;
408 default:
409 return;
410 }
411
412 skb->priority = prio + 256;
413 }
414
415 static int batadv_recv_unhandled_packet(struct sk_buff *skb,
416 struct batadv_hard_iface *recv_if)
417 {
418 kfree_skb(skb);
419
420 return NET_RX_DROP;
421 }
422
423 /* incoming packets with the batman ethertype received on any active hard
424 * interface
425 */
426
427 /**
428 * batadv_batman_skb_recv() - Handle incoming message from an hard interface
429 * @skb: the received packet
430 * @dev: the net device that the packet was received on
431 * @ptype: packet type of incoming packet (ETH_P_BATMAN)
432 * @orig_dev: the original receive net device (e.g. bonded device)
433 *
434 * Return: NET_RX_SUCCESS on success or NET_RX_DROP in case of failure
435 */
436 int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
437 struct packet_type *ptype,
438 struct net_device *orig_dev)
439 {
440 struct batadv_priv *bat_priv;
441 struct batadv_ogm_packet *batadv_ogm_packet;
442 struct batadv_hard_iface *hard_iface;
443 u8 idx;
444
445 hard_iface = container_of(ptype, struct batadv_hard_iface,
446 batman_adv_ptype);
447
448 /* Prevent processing a packet received on an interface which is getting
449 * shut down otherwise the packet may trigger de-reference errors
450 * further down in the receive path.
451 */
452 if (!kref_get_unless_zero(&hard_iface->refcount))
453 goto err_out;
454
455 skb = skb_share_check(skb, GFP_ATOMIC);
456
457 /* skb was released by skb_share_check() */
458 if (!skb)
459 goto err_put;
460
461 /* packet should hold at least type and version */
462 if (unlikely(!pskb_may_pull(skb, 2)))
463 goto err_free;
464
465 /* expect a valid ethernet header here. */
466 if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb)))
467 goto err_free;
468
469 if (!hard_iface->soft_iface)
470 goto err_free;
471
472 bat_priv = netdev_priv(hard_iface->soft_iface);
473
474 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
475 goto err_free;
476
477 /* discard frames on not active interfaces */
478 if (hard_iface->if_status != BATADV_IF_ACTIVE)
479 goto err_free;
480
481 batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data;
482
483 if (batadv_ogm_packet->version != BATADV_COMPAT_VERSION) {
484 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
485 "Drop packet: incompatible batman version (%i)\n",
486 batadv_ogm_packet->version);
487 goto err_free;
488 }
489
490 /* reset control block to avoid left overs from previous users */
491 memset(skb->cb, 0, sizeof(struct batadv_skb_cb));
492
493 idx = batadv_ogm_packet->packet_type;
494 (*batadv_rx_handler[idx])(skb, hard_iface);
495
496 batadv_hardif_put(hard_iface);
497
498 /* return NET_RX_SUCCESS in any case as we
499 * most probably dropped the packet for
500 * routing-logical reasons.
501 */
502 return NET_RX_SUCCESS;
503
504 err_free:
505 kfree_skb(skb);
506 err_put:
507 batadv_hardif_put(hard_iface);
508 err_out:
509 return NET_RX_DROP;
510 }
511
512 static void batadv_recv_handler_init(void)
513 {
514 int i;
515
516 for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++)
517 batadv_rx_handler[i] = batadv_recv_unhandled_packet;
518
519 for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++)
520 batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet;
521
522 /* compile time checks for sizes */
523 BUILD_BUG_ON(sizeof(struct batadv_bla_claim_dst) != 6);
524 BUILD_BUG_ON(sizeof(struct batadv_ogm_packet) != 24);
525 BUILD_BUG_ON(sizeof(struct batadv_icmp_header) != 20);
526 BUILD_BUG_ON(sizeof(struct batadv_icmp_packet) != 20);
527 BUILD_BUG_ON(sizeof(struct batadv_icmp_packet_rr) != 116);
528 BUILD_BUG_ON(sizeof(struct batadv_unicast_packet) != 10);
529 BUILD_BUG_ON(sizeof(struct batadv_unicast_4addr_packet) != 18);
530 BUILD_BUG_ON(sizeof(struct batadv_frag_packet) != 20);
531 BUILD_BUG_ON(sizeof(struct batadv_bcast_packet) != 14);
532 BUILD_BUG_ON(sizeof(struct batadv_coded_packet) != 46);
533 BUILD_BUG_ON(sizeof(struct batadv_unicast_tvlv_packet) != 20);
534 BUILD_BUG_ON(sizeof(struct batadv_tvlv_hdr) != 4);
535 BUILD_BUG_ON(sizeof(struct batadv_tvlv_gateway_data) != 8);
536 BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_vlan_data) != 8);
537 BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_change) != 12);
538 BUILD_BUG_ON(sizeof(struct batadv_tvlv_roam_adv) != 8);
539
540 i = FIELD_SIZEOF(struct sk_buff, cb);
541 BUILD_BUG_ON(sizeof(struct batadv_skb_cb) > i);
542
543 /* broadcast packet */
544 batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet;
545
546 /* unicast packets ... */
547 /* unicast with 4 addresses packet */
548 batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet;
549 /* unicast packet */
550 batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet;
551 /* unicast tvlv packet */
552 batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv;
553 /* batman icmp packet */
554 batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet;
555 /* Fragmented packets */
556 batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet;
557 }
558
559 /**
560 * batadv_recv_handler_register() - Register handler for batman-adv packet type
561 * @packet_type: batadv_packettype which should be handled
562 * @recv_handler: receive handler for the packet type
563 *
564 * Return: 0 on success or negative error number in case of failure
565 */
566 int
567 batadv_recv_handler_register(u8 packet_type,
568 int (*recv_handler)(struct sk_buff *,
569 struct batadv_hard_iface *))
570 {
571 int (*curr)(struct sk_buff *skb,
572 struct batadv_hard_iface *recv_if);
573 curr = batadv_rx_handler[packet_type];
574
575 if (curr != batadv_recv_unhandled_packet &&
576 curr != batadv_recv_unhandled_unicast_packet)
577 return -EBUSY;
578
579 batadv_rx_handler[packet_type] = recv_handler;
580 return 0;
581 }
582
583 /**
584 * batadv_recv_handler_unregister() - Unregister handler for packet type
585 * @packet_type: batadv_packettype which should no longer be handled
586 */
587 void batadv_recv_handler_unregister(u8 packet_type)
588 {
589 batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet;
590 }
591
592 /**
593 * batadv_skb_crc32() - calculate CRC32 of the whole packet and skip bytes in
594 * the header
595 * @skb: skb pointing to fragmented socket buffers
596 * @payload_ptr: Pointer to position inside the head buffer of the skb
597 * marking the start of the data to be CRC'ed
598 *
599 * payload_ptr must always point to an address in the skb head buffer and not to
600 * a fragment.
601 *
602 * Return: big endian crc32c of the checksummed data
603 */
604 __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr)
605 {
606 u32 crc = 0;
607 unsigned int from;
608 unsigned int to = skb->len;
609 struct skb_seq_state st;
610 const u8 *data;
611 unsigned int len;
612 unsigned int consumed = 0;
613
614 from = (unsigned int)(payload_ptr - skb->data);
615
616 skb_prepare_seq_read(skb, from, to, &st);
617 while ((len = skb_seq_read(consumed, &data, &st)) != 0) {
618 crc = crc32c(crc, data, len);
619 consumed += len;
620 }
621
622 return htonl(crc);
623 }
624
625 /**
626 * batadv_get_vid() - extract the VLAN identifier from skb if any
627 * @skb: the buffer containing the packet
628 * @header_len: length of the batman header preceding the ethernet header
629 *
630 * Return: VID with the BATADV_VLAN_HAS_TAG flag when the packet embedded in the
631 * skb is vlan tagged. Otherwise BATADV_NO_FLAGS.
632 */
633 unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len)
634 {
635 struct ethhdr *ethhdr = (struct ethhdr *)(skb->data + header_len);
636 struct vlan_ethhdr *vhdr;
637 unsigned short vid;
638
639 if (ethhdr->h_proto != htons(ETH_P_8021Q))
640 return BATADV_NO_FLAGS;
641
642 if (!pskb_may_pull(skb, header_len + VLAN_ETH_HLEN))
643 return BATADV_NO_FLAGS;
644
645 vhdr = (struct vlan_ethhdr *)(skb->data + header_len);
646 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
647 vid |= BATADV_VLAN_HAS_TAG;
648
649 return vid;
650 }
651
652 /**
653 * batadv_vlan_ap_isola_get() - return AP isolation status for the given vlan
654 * @bat_priv: the bat priv with all the soft interface information
655 * @vid: the VLAN identifier for which the AP isolation attributed as to be
656 * looked up
657 *
658 * Return: true if AP isolation is on for the VLAN idenfied by vid, false
659 * otherwise
660 */
661 bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid)
662 {
663 bool ap_isolation_enabled = false;
664 struct batadv_softif_vlan *vlan;
665
666 /* if the AP isolation is requested on a VLAN, then check for its
667 * setting in the proper VLAN private data structure
668 */
669 vlan = batadv_softif_vlan_get(bat_priv, vid);
670 if (vlan) {
671 ap_isolation_enabled = atomic_read(&vlan->ap_isolation);
672 batadv_softif_vlan_put(vlan);
673 }
674
675 return ap_isolation_enabled;
676 }
677
678 module_init(batadv_init);
679 module_exit(batadv_exit);
680
681 MODULE_LICENSE("GPL");
682
683 MODULE_AUTHOR(BATADV_DRIVER_AUTHOR);
684 MODULE_DESCRIPTION(BATADV_DRIVER_DESC);
685 MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE);
686 MODULE_VERSION(BATADV_SOURCE_VERSION);
687 MODULE_ALIAS_RTNL_LINK("batadv");
688 MODULE_ALIAS_GENL_FAMILY(BATADV_NL_NAME);
689
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