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