1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2007-2020 B.A.T.M.A.N. contributors:
3 *
4 * Marek Lindner, Simon Wunderlich
5 */
6
7 #include "main.h"
8
9 #include <linux/atomic.h>
10 #include <linux/build_bug.h>
11 #include <linux/byteorder/generic.h>
12 #include <linux/crc32c.h>
13 #include <linux/device.h>
14 #include <linux/errno.h>
15 #include <linux/genetlink.h>
16 #include <linux/gfp.h>
17 #include <linux/if_ether.h>
18 #include <linux/if_vlan.h>
19 #include <linux/init.h>
20 #include <linux/ip.h>
21 #include <linux/ipv6.h>
22 #include <linux/kernel.h>
23 #include <linux/kobject.h>
24 #include <linux/kref.h>
25 #include <linux/list.h>
26 #include <linux/module.h>
27 #include <linux/netdevice.h>
28 #include <linux/printk.h>
29 #include <linux/rculist.h>
30 #include <linux/rcupdate.h>
31 #include <linux/seq_file.h>
32 #include <linux/skbuff.h>
33 #include <linux/slab.h>
34 #include <linux/spinlock.h>
35 #include <linux/stddef.h>
36 #include <linux/string.h>
37 #include <linux/workqueue.h>
38 #include <net/dsfield.h>
39 #include <net/rtnetlink.h>
40 #include <uapi/linux/batadv_packet.h>
41 #include <uapi/linux/batman_adv.h>
42
43 #include "bat_algo.h"
44 #include "bat_iv_ogm.h"
45 #include "bat_v.h"
46 #include "bridge_loop_avoidance.h"
47 #include "debugfs.h"
48 #include "distributed-arp-table.h"
49 #include "gateway_client.h"
50 #include "gateway_common.h"
51 #include "hard-interface.h"
52 #include "icmp_socket.h"
53 #include "log.h"
54 #include "multicast.h"
55 #include "netlink.h"
56 #include "network-coding.h"
57 #include "originator.h"
58 #include "routing.h"
59 #include "send.h"
60 #include "soft-interface.h"
61 #include "tp_meter.h"
62 #include "translation-table.h"
63
64 /* List manipulations on hardif_list have to be rtnl_lock()'ed,
65 * list traversals just rcu-locked
66 */
67 struct list_head batadv_hardif_list;
68 unsigned int batadv_hardif_generation;
69 static int (*batadv_rx_handler[256])(struct sk_buff *skb,
70 struct batadv_hard_iface *recv_if);
71
72 unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
73
74 struct workqueue_struct *batadv_event_workqueue;
75
76 static void batadv_recv_handler_init(void);
77
78 #define BATADV_UEV_TYPE_VAR "BATTYPE="
79 #define BATADV_UEV_ACTION_VAR "BATACTION="
80 #define BATADV_UEV_DATA_VAR "BATDATA="
81
82 static char *batadv_uev_action_str[] = {
83 "add",
84 "del",
85 "change",
86 "loopdetect",
87 };
88
89 static char *batadv_uev_type_str[] = {
90 "gw",
91 "bla",
92 };
93
94 static int __init batadv_init(void)
95 {
96 int ret;
97
98 ret = batadv_tt_cache_init();
99 if (ret < 0)
100 return ret;
101
102 INIT_LIST_HEAD(&batadv_hardif_list);
103 batadv_algo_init();
104
105 batadv_recv_handler_init();
106
107 batadv_v_init();
108 batadv_iv_init();
109 batadv_nc_init();
110 batadv_tp_meter_init();
111
112 batadv_event_workqueue = create_singlethread_workqueue("bat_events");
113 if (!batadv_event_workqueue)
114 goto err_create_wq;
115
116 batadv_socket_init();
117 batadv_debugfs_init();
118
119 register_netdevice_notifier(&batadv_hard_if_notifier);
120 rtnl_link_register(&batadv_link_ops);
121 batadv_netlink_register();
122
123 pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n",
124 BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION);
125
126 return 0;
127
128 err_create_wq:
129 batadv_tt_cache_destroy();
130
131 return -ENOMEM;
132 }
133
134 static void __exit batadv_exit(void)
135 {
136 batadv_debugfs_destroy();
137 batadv_netlink_unregister();
138 rtnl_link_unregister(&batadv_link_ops);
139 unregister_netdevice_notifier(&batadv_hard_if_notifier);
140 batadv_hardif_remove_interfaces();
141
142 flush_workqueue(batadv_event_workqueue);
143 destroy_workqueue(batadv_event_workqueue);
144 batadv_event_workqueue = NULL;
145
146 rcu_barrier();
147
148 batadv_tt_cache_destroy();
149 }
150
151 /**
152 * batadv_mesh_init() - Initialize soft interface
153 * @soft_iface: netdev struct of the soft interface
154 *
155 * Return: 0 on success or negative error number in case of failure
156 */
157 int batadv_mesh_init(struct net_device *soft_iface)
158 {
159 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
160 int ret;
161
162 spin_lock_init(&bat_priv->forw_bat_list_lock);
163 spin_lock_init(&bat_priv->forw_bcast_list_lock);
164 spin_lock_init(&bat_priv->tt.changes_list_lock);
165 spin_lock_init(&bat_priv->tt.req_list_lock);
166 spin_lock_init(&bat_priv->tt.roam_list_lock);
167 spin_lock_init(&bat_priv->tt.last_changeset_lock);
168 spin_lock_init(&bat_priv->tt.commit_lock);
169 spin_lock_init(&bat_priv->gw.list_lock);
170 #ifdef CONFIG_BATMAN_ADV_MCAST
171 spin_lock_init(&bat_priv->mcast.mla_lock);
172 spin_lock_init(&bat_priv->mcast.want_lists_lock);
173 #endif
174 spin_lock_init(&bat_priv->tvlv.container_list_lock);
175 spin_lock_init(&bat_priv->tvlv.handler_list_lock);
176 spin_lock_init(&bat_priv->softif_vlan_list_lock);
177 spin_lock_init(&bat_priv->tp_list_lock);
178
179 INIT_HLIST_HEAD(&bat_priv->forw_bat_list);
180 INIT_HLIST_HEAD(&bat_priv->forw_bcast_list);
181 INIT_HLIST_HEAD(&bat_priv->gw.gateway_list);
182 #ifdef CONFIG_BATMAN_ADV_MCAST
183 INIT_HLIST_HEAD(&bat_priv->mcast.want_all_unsnoopables_list);
184 INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv4_list);
185 INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv6_list);
186 #endif
187 INIT_LIST_HEAD(&bat_priv->tt.changes_list);
188 INIT_HLIST_HEAD(&bat_priv->tt.req_list);
189 INIT_LIST_HEAD(&bat_priv->tt.roam_list);
190 #ifdef CONFIG_BATMAN_ADV_MCAST
191 INIT_HLIST_HEAD(&bat_priv->mcast.mla_list);
192 #endif
193 INIT_HLIST_HEAD(&bat_priv->tvlv.container_list);
194 INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list);
195 INIT_HLIST_HEAD(&bat_priv->softif_vlan_list);
196 INIT_HLIST_HEAD(&bat_priv->tp_list);
197
198 bat_priv->gw.generation = 0;
199
200 ret = batadv_v_mesh_init(bat_priv);
201 if (ret < 0)
202 goto err;
203
204 ret = batadv_originator_init(bat_priv);
205 if (ret < 0)
206 goto err;
207
208 ret = batadv_tt_init(bat_priv);
209 if (ret < 0)
210 goto err;
211
212 ret = batadv_bla_init(bat_priv);
213 if (ret < 0)
214 goto err;
215
216 ret = batadv_dat_init(bat_priv);
217 if (ret < 0)
218 goto err;
219
220 ret = batadv_nc_mesh_init(bat_priv);
221 if (ret < 0)
222 goto err;
223
224 batadv_gw_init(bat_priv);
225 batadv_mcast_init(bat_priv);
226
227 atomic_set(&bat_priv->gw.reselect, 0);
228 atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE);
229
230 return 0;
231
232 err:
233 batadv_mesh_free(soft_iface);
234 return ret;
235 }
236
237 /**
238 * batadv_mesh_free() - Deinitialize soft interface
239 * @soft_iface: netdev struct of the soft interface
240 */
241 void batadv_mesh_free(struct net_device *soft_iface)
242 {
243 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
244
245 atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING);
246
247 batadv_purge_outstanding_packets(bat_priv, NULL);
248
249 batadv_gw_node_free(bat_priv);
250
251 batadv_v_mesh_free(bat_priv);
252 batadv_nc_mesh_free(bat_priv);
253 batadv_dat_free(bat_priv);
254 batadv_bla_free(bat_priv);
255
256 batadv_mcast_free(bat_priv);
257
258 /* Free the TT and the originator tables only after having terminated
259 * all the other depending components which may use these structures for
260 * their purposes.
261 */
262 batadv_tt_free(bat_priv);
263
264 /* Since the originator table clean up routine is accessing the TT
265 * tables as well, it has to be invoked after the TT tables have been
266 * freed and marked as empty. This ensures that no cleanup RCU callbacks
267 * accessing the TT data are scheduled for later execution.
268 */
269 batadv_originator_free(bat_priv);
270
271 batadv_gw_free(bat_priv);
272
273 free_percpu(bat_priv->bat_counters);
274 bat_priv->bat_counters = NULL;
275
276 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
277 }
278
279 /**
280 * batadv_is_my_mac() - check if the given mac address belongs to any of the
281 * real interfaces in the current mesh
282 * @bat_priv: the bat priv with all the soft interface information
283 * @addr: the address to check
284 *
285 * Return: 'true' if the mac address was found, false otherwise.
286 */
287 bool batadv_is_my_mac(struct batadv_priv *bat_priv, const u8 *addr)
288 {
289 const struct batadv_hard_iface *hard_iface;
290 bool is_my_mac = false;
291
292 rcu_read_lock();
293 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
294 if (hard_iface->if_status != BATADV_IF_ACTIVE)
295 continue;
296
297 if (hard_iface->soft_iface != bat_priv->soft_iface)
298 continue;
299
300 if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) {
301 is_my_mac = true;
302 break;
303 }
304 }
305 rcu_read_unlock();
306 return is_my_mac;
307 }
308
309 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
310 /**
311 * batadv_seq_print_text_primary_if_get() - called from debugfs table printing
312 * function that requires the primary interface
313 * @seq: debugfs table seq_file struct
314 *
315 * Return: primary interface if found or NULL otherwise.
316 */
317 struct batadv_hard_iface *
318 batadv_seq_print_text_primary_if_get(struct seq_file *seq)
319 {
320 struct net_device *net_dev = (struct net_device *)seq->private;
321 struct batadv_priv *bat_priv = netdev_priv(net_dev);
322 struct batadv_hard_iface *primary_if;
323
324 primary_if = batadv_primary_if_get_selected(bat_priv);
325
326 if (!primary_if) {
327 seq_printf(seq,
328 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
329 net_dev->name);
330 goto out;
331 }
332
333 if (primary_if->if_status == BATADV_IF_ACTIVE)
334 goto out;
335
336 seq_printf(seq,
337 "BATMAN mesh %s disabled - primary interface not active\n",
338 net_dev->name);
339 batadv_hardif_put(primary_if);
340 primary_if = NULL;
341
342 out:
343 return primary_if;
344 }
345 #endif
346
347 /**
348 * batadv_max_header_len() - calculate maximum encapsulation overhead for a
349 * payload packet
350 *
351 * Return: the maximum encapsulation overhead in bytes.
352 */
353 int batadv_max_header_len(void)
354 {
355 int header_len = 0;
356
357 header_len = max_t(int, header_len,
358 sizeof(struct batadv_unicast_packet));
359 header_len = max_t(int, header_len,
360 sizeof(struct batadv_unicast_4addr_packet));
361 header_len = max_t(int, header_len,
362 sizeof(struct batadv_bcast_packet));
363
364 #ifdef CONFIG_BATMAN_ADV_NC
365 header_len = max_t(int, header_len,
366 sizeof(struct batadv_coded_packet));
367 #endif
368
369 return header_len + ETH_HLEN;
370 }
371
372 /**
373 * batadv_skb_set_priority() - sets skb priority according to packet content
374 * @skb: the packet to be sent
375 * @offset: offset to the packet content
376 *
377 * This function sets a value between 256 and 263 (802.1d priority), which
378 * can be interpreted by the cfg80211 or other drivers.
379 */
380 void batadv_skb_set_priority(struct sk_buff *skb, int offset)
381 {
382 struct iphdr ip_hdr_tmp, *ip_hdr;
383 struct ipv6hdr ip6_hdr_tmp, *ip6_hdr;
384 struct ethhdr ethhdr_tmp, *ethhdr;
385 struct vlan_ethhdr *vhdr, vhdr_tmp;
386 u32 prio;
387
388 /* already set, do nothing */
389 if (skb->priority >= 256 && skb->priority <= 263)
390 return;
391
392 ethhdr = skb_header_pointer(skb, offset, sizeof(*ethhdr), ðhdr_tmp);
393 if (!ethhdr)
394 return;
395
396 switch (ethhdr->h_proto) {
397 case htons(ETH_P_8021Q):
398 vhdr = skb_header_pointer(skb, offset + sizeof(*vhdr),
399 sizeof(*vhdr), &vhdr_tmp);
400 if (!vhdr)
401 return;
402 prio = ntohs(vhdr->h_vlan_TCI) & VLAN_PRIO_MASK;
403 prio = prio >> VLAN_PRIO_SHIFT;
404 break;
405 case htons(ETH_P_IP):
406 ip_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr),
407 sizeof(*ip_hdr), &ip_hdr_tmp);
408 if (!ip_hdr)
409 return;
410 prio = (ipv4_get_dsfield(ip_hdr) & 0xfc) >> 5;
411 break;
412 case htons(ETH_P_IPV6):
413 ip6_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr),
414 sizeof(*ip6_hdr), &ip6_hdr_tmp);
415 if (!ip6_hdr)
416 return;
417 prio = (ipv6_get_dsfield(ip6_hdr) & 0xfc) >> 5;
418 break;
419 default:
420 return;
421 }
422
423 skb->priority = prio + 256;
424 }
425
426 static int batadv_recv_unhandled_packet(struct sk_buff *skb,
427 struct batadv_hard_iface *recv_if)
428 {
429 kfree_skb(skb);
430
431 return NET_RX_DROP;
432 }
433
434 /* incoming packets with the batman ethertype received on any active hard
435 * interface
436 */
437
438 /**
439 * batadv_batman_skb_recv() - Handle incoming message from an hard interface
440 * @skb: the received packet
441 * @dev: the net device that the packet was received on
442 * @ptype: packet type of incoming packet (ETH_P_BATMAN)
443 * @orig_dev: the original receive net device (e.g. bonded device)
444 *
445 * Return: NET_RX_SUCCESS on success or NET_RX_DROP in case of failure
446 */
447 int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
448 struct packet_type *ptype,
449 struct net_device *orig_dev)
450 {
451 struct batadv_priv *bat_priv;
452 struct batadv_ogm_packet *batadv_ogm_packet;
453 struct batadv_hard_iface *hard_iface;
454 u8 idx;
455
456 hard_iface = container_of(ptype, struct batadv_hard_iface,
457 batman_adv_ptype);
458
459 /* Prevent processing a packet received on an interface which is getting
460 * shut down otherwise the packet may trigger de-reference errors
461 * further down in the receive path.
462 */
463 if (!kref_get_unless_zero(&hard_iface->refcount))
464 goto err_out;
465
466 skb = skb_share_check(skb, GFP_ATOMIC);
467
468 /* skb was released by skb_share_check() */
469 if (!skb)
470 goto err_put;
471
472 /* packet should hold at least type and version */
473 if (unlikely(!pskb_may_pull(skb, 2)))
474 goto err_free;
475
476 /* expect a valid ethernet header here. */
477 if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb)))
478 goto err_free;
479
480 if (!hard_iface->soft_iface)
481 goto err_free;
482
483 bat_priv = netdev_priv(hard_iface->soft_iface);
484
485 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
486 goto err_free;
487
488 /* discard frames on not active interfaces */
489 if (hard_iface->if_status != BATADV_IF_ACTIVE)
490 goto err_free;
491
492 batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data;
493
494 if (batadv_ogm_packet->version != BATADV_COMPAT_VERSION) {
495 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
496 "Drop packet: incompatible batman version (%i)\n",
497 batadv_ogm_packet->version);
498 goto err_free;
499 }
500
501 /* reset control block to avoid left overs from previous users */
502 memset(skb->cb, 0, sizeof(struct batadv_skb_cb));
503
504 idx = batadv_ogm_packet->packet_type;
505 (*batadv_rx_handler[idx])(skb, hard_iface);
506
507 batadv_hardif_put(hard_iface);
508
509 /* return NET_RX_SUCCESS in any case as we
510 * most probably dropped the packet for
511 * routing-logical reasons.
512 */
513 return NET_RX_SUCCESS;
514
515 err_free:
516 kfree_skb(skb);
517 err_put:
518 batadv_hardif_put(hard_iface);
519 err_out:
520 return NET_RX_DROP;
521 }
522
523 static void batadv_recv_handler_init(void)
524 {
525 int i;
526
527 for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++)
528 batadv_rx_handler[i] = batadv_recv_unhandled_packet;
529
530 for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++)
531 batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet;
532
533 /* compile time checks for sizes */
534 BUILD_BUG_ON(sizeof(struct batadv_bla_claim_dst) != 6);
535 BUILD_BUG_ON(sizeof(struct batadv_ogm_packet) != 24);
536 BUILD_BUG_ON(sizeof(struct batadv_icmp_header) != 20);
537 BUILD_BUG_ON(sizeof(struct batadv_icmp_packet) != 20);
538 BUILD_BUG_ON(sizeof(struct batadv_icmp_packet_rr) != 116);
539 BUILD_BUG_ON(sizeof(struct batadv_unicast_packet) != 10);
540 BUILD_BUG_ON(sizeof(struct batadv_unicast_4addr_packet) != 18);
541 BUILD_BUG_ON(sizeof(struct batadv_frag_packet) != 20);
542 BUILD_BUG_ON(sizeof(struct batadv_bcast_packet) != 14);
543 BUILD_BUG_ON(sizeof(struct batadv_coded_packet) != 46);
544 BUILD_BUG_ON(sizeof(struct batadv_unicast_tvlv_packet) != 20);
545 BUILD_BUG_ON(sizeof(struct batadv_tvlv_hdr) != 4);
546 BUILD_BUG_ON(sizeof(struct batadv_tvlv_gateway_data) != 8);
547 BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_vlan_data) != 8);
548 BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_change) != 12);
549 BUILD_BUG_ON(sizeof(struct batadv_tvlv_roam_adv) != 8);
550
551 i = sizeof_field(struct sk_buff, cb);
552 BUILD_BUG_ON(sizeof(struct batadv_skb_cb) > i);
553
554 /* broadcast packet */
555 batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet;
556
557 /* unicast packets ... */
558 /* unicast with 4 addresses packet */
559 batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet;
560 /* unicast packet */
561 batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet;
562 /* unicast tvlv packet */
563 batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv;
564 /* batman icmp packet */
565 batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet;
566 /* Fragmented packets */
567 batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet;
568 }
569
570 /**
571 * batadv_recv_handler_register() - Register handler for batman-adv packet type
572 * @packet_type: batadv_packettype which should be handled
573 * @recv_handler: receive handler for the packet type
574 *
575 * Return: 0 on success or negative error number in case of failure
576 */
577 int
578 batadv_recv_handler_register(u8 packet_type,
579 int (*recv_handler)(struct sk_buff *,
580 struct batadv_hard_iface *))
581 {
582 int (*curr)(struct sk_buff *skb,
583 struct batadv_hard_iface *recv_if);
584 curr = batadv_rx_handler[packet_type];
585
586 if (curr != batadv_recv_unhandled_packet &&
587 curr != batadv_recv_unhandled_unicast_packet)
588 return -EBUSY;
589
590 batadv_rx_handler[packet_type] = recv_handler;
591 return 0;
592 }
593
594 /**
595 * batadv_recv_handler_unregister() - Unregister handler for packet type
596 * @packet_type: batadv_packettype which should no longer be handled
597 */
598 void batadv_recv_handler_unregister(u8 packet_type)
599 {
600 batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet;
601 }
602
603 /**
604 * batadv_skb_crc32() - calculate CRC32 of the whole packet and skip bytes in
605 * the header
606 * @skb: skb pointing to fragmented socket buffers
607 * @payload_ptr: Pointer to position inside the head buffer of the skb
608 * marking the start of the data to be CRC'ed
609 *
610 * payload_ptr must always point to an address in the skb head buffer and not to
611 * a fragment.
612 *
613 * Return: big endian crc32c of the checksummed data
614 */
615 __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr)
616 {
617 u32 crc = 0;
618 unsigned int from;
619 unsigned int to = skb->len;
620 struct skb_seq_state st;
621 const u8 *data;
622 unsigned int len;
623 unsigned int consumed = 0;
624
625 from = (unsigned int)(payload_ptr - skb->data);
626
627 skb_prepare_seq_read(skb, from, to, &st);
628 while ((len = skb_seq_read(consumed, &data, &st)) != 0) {
629 crc = crc32c(crc, data, len);
630 consumed += len;
631 }
632
633 return htonl(crc);
634 }
635
636 /**
637 * batadv_get_vid() - extract the VLAN identifier from skb if any
638 * @skb: the buffer containing the packet
639 * @header_len: length of the batman header preceding the ethernet header
640 *
641 * Return: VID with the BATADV_VLAN_HAS_TAG flag when the packet embedded in the
642 * skb is vlan tagged. Otherwise BATADV_NO_FLAGS.
643 */
644 unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len)
645 {
646 struct ethhdr *ethhdr = (struct ethhdr *)(skb->data + header_len);
647 struct vlan_ethhdr *vhdr;
648 unsigned short vid;
649
650 if (ethhdr->h_proto != htons(ETH_P_8021Q))
651 return BATADV_NO_FLAGS;
652
653 if (!pskb_may_pull(skb, header_len + VLAN_ETH_HLEN))
654 return BATADV_NO_FLAGS;
655
656 vhdr = (struct vlan_ethhdr *)(skb->data + header_len);
657 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
658 vid |= BATADV_VLAN_HAS_TAG;
659
660 return vid;
661 }
662
663 /**
664 * batadv_vlan_ap_isola_get() - return AP isolation status for the given vlan
665 * @bat_priv: the bat priv with all the soft interface information
666 * @vid: the VLAN identifier for which the AP isolation attributed as to be
667 * looked up
668 *
669 * Return: true if AP isolation is on for the VLAN identified by vid, false
670 * otherwise
671 */
672 bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid)
673 {
674 bool ap_isolation_enabled = false;
675 struct batadv_softif_vlan *vlan;
676
677 /* if the AP isolation is requested on a VLAN, then check for its
678 * setting in the proper VLAN private data structure
679 */
680 vlan = batadv_softif_vlan_get(bat_priv, vid);
681 if (vlan) {
682 ap_isolation_enabled = atomic_read(&vlan->ap_isolation);
683 batadv_softif_vlan_put(vlan);
684 }
685
686 return ap_isolation_enabled;
687 }
688
689 /**
690 * batadv_throw_uevent() - Send an uevent with batman-adv specific env data
691 * @bat_priv: the bat priv with all the soft interface information
692 * @type: subsystem type of event. Stored in uevent's BATTYPE
693 * @action: action type of event. Stored in uevent's BATACTION
694 * @data: string with additional information to the event (ignored for
695 * BATADV_UEV_DEL). Stored in uevent's BATDATA
696 *
697 * Return: 0 on success or negative error number in case of failure
698 */
699 int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type,
700 enum batadv_uev_action action, const char *data)
701 {
702 int ret = -ENOMEM;
703 struct kobject *bat_kobj;
704 char *uevent_env[4] = { NULL, NULL, NULL, NULL };
705
706 bat_kobj = &bat_priv->soft_iface->dev.kobj;
707
708 uevent_env[0] = kasprintf(GFP_ATOMIC,
709 "%s%s", BATADV_UEV_TYPE_VAR,
710 batadv_uev_type_str[type]);
711 if (!uevent_env[0])
712 goto out;
713
714 uevent_env[1] = kasprintf(GFP_ATOMIC,
715 "%s%s", BATADV_UEV_ACTION_VAR,
716 batadv_uev_action_str[action]);
717 if (!uevent_env[1])
718 goto out;
719
720 /* If the event is DEL, ignore the data field */
721 if (action != BATADV_UEV_DEL) {
722 uevent_env[2] = kasprintf(GFP_ATOMIC,
723 "%s%s", BATADV_UEV_DATA_VAR, data);
724 if (!uevent_env[2])
725 goto out;
726 }
727
728 ret = kobject_uevent_env(bat_kobj, KOBJ_CHANGE, uevent_env);
729 out:
730 kfree(uevent_env[0]);
731 kfree(uevent_env[1]);
732 kfree(uevent_env[2]);
733
734 if (ret)
735 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
736 "Impossible to send uevent for (%s,%s,%s) event (err: %d)\n",
737 batadv_uev_type_str[type],
738 batadv_uev_action_str[action],
739 (action == BATADV_UEV_DEL ? "NULL" : data), ret);
740 return ret;
741 }
742
743 module_init(batadv_init);
744 module_exit(batadv_exit);
745
746 MODULE_LICENSE("GPL");
747
748 MODULE_AUTHOR(BATADV_DRIVER_AUTHOR);
749 MODULE_DESCRIPTION(BATADV_DRIVER_DESC);
750 MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE);
751 MODULE_VERSION(BATADV_SOURCE_VERSION);
752 MODULE_ALIAS_RTNL_LINK("batadv");
753 MODULE_ALIAS_GENL_FAMILY(BATADV_NL_NAME);
754
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