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Linux/net/batman-adv/main.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /* Copyright (C) 2007-2017  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), &ethhdr_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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