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