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
253 batadv_gw_node_free(bat_priv);
254
255 batadv_v_mesh_free(bat_priv);
256 batadv_dat_free(bat_priv);
257 batadv_bla_free(bat_priv);
258
259 batadv_mcast_free(bat_priv);
260
261 /* Free the TT and the originator tables only after having terminated
262 * all the other depending components which may use these structures for
263 * their purposes.
264 */
265 batadv_tt_free(bat_priv);
266
267 /* Since the originator table clean up routine is accessing the TT
268 * tables as well, it has to be invoked after the TT tables have been
269 * freed and marked as empty. This ensures that no cleanup RCU callbacks
270 * accessing the TT data are scheduled for later execution.
271 */
272 batadv_originator_free(bat_priv);
273
274 batadv_gw_free(bat_priv);
275
276 free_percpu(bat_priv->bat_counters);
277 bat_priv->bat_counters = NULL;
278
279 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
280 }
281
282 /**
283 * batadv_is_my_mac() - check if the given mac address belongs to any of the
284 * real interfaces in the current mesh
285 * @bat_priv: the bat priv with all the mesh interface information
286 * @addr: the address to check
287 *
288 * Return: 'true' if the mac address was found, false otherwise.
289 */
batadv_is_my_mac(struct batadv_priv * bat_priv,const u8 * addr)290 bool batadv_is_my_mac(struct batadv_priv *bat_priv, const u8 *addr)
291 {
292 const struct batadv_hard_iface *hard_iface;
293 struct list_head *iter;
294 bool is_my_mac = false;
295
296 rcu_read_lock();
297 netdev_for_each_lower_private_rcu(bat_priv->mesh_iface, hard_iface, iter) {
298 if (hard_iface->if_status != BATADV_IF_ACTIVE)
299 continue;
300
301 if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) {
302 is_my_mac = true;
303 break;
304 }
305 }
306 rcu_read_unlock();
307 return is_my_mac;
308 }
309
310 /**
311 * batadv_max_header_len() - calculate maximum encapsulation overhead for a
312 * payload packet
313 *
314 * Return: the maximum encapsulation overhead in bytes.
315 */
batadv_max_header_len(void)316 int batadv_max_header_len(void)
317 {
318 int header_len = 0;
319
320 header_len = max_t(int, header_len,
321 sizeof(struct batadv_unicast_packet));
322 header_len = max_t(int, header_len,
323 sizeof(struct batadv_unicast_4addr_packet));
324 header_len = max_t(int, header_len,
325 sizeof(struct batadv_bcast_packet));
326
327 return header_len + ETH_HLEN;
328 }
329
330 /**
331 * batadv_skb_set_priority() - sets skb priority according to packet content
332 * @skb: the packet to be sent
333 * @offset: offset to the packet content
334 *
335 * This function sets a value between 256 and 263 (802.1d priority), which
336 * can be interpreted by the cfg80211 or other drivers.
337 */
batadv_skb_set_priority(struct sk_buff * skb,int offset)338 void batadv_skb_set_priority(struct sk_buff *skb, int offset)
339 {
340 struct iphdr ip_hdr_tmp, *ip_hdr;
341 struct ipv6hdr ip6_hdr_tmp, *ip6_hdr;
342 struct ethhdr ethhdr_tmp, *ethhdr;
343 struct vlan_ethhdr *vhdr, vhdr_tmp;
344 u32 prio;
345
346 /* already set, do nothing */
347 if (skb->priority >= 256 && skb->priority <= 263)
348 return;
349
350 ethhdr = skb_header_pointer(skb, offset, sizeof(*ethhdr), ðhdr_tmp);
351 if (!ethhdr)
352 return;
353
354 switch (ethhdr->h_proto) {
355 case htons(ETH_P_8021Q):
356 vhdr = skb_header_pointer(skb, offset + sizeof(*vhdr),
357 sizeof(*vhdr), &vhdr_tmp);
358 if (!vhdr)
359 return;
360 prio = ntohs(vhdr->h_vlan_TCI) & VLAN_PRIO_MASK;
361 prio = prio >> VLAN_PRIO_SHIFT;
362 break;
363 case htons(ETH_P_IP):
364 ip_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr),
365 sizeof(*ip_hdr), &ip_hdr_tmp);
366 if (!ip_hdr)
367 return;
368 prio = (ipv4_get_dsfield(ip_hdr) & 0xfc) >> 5;
369 break;
370 case htons(ETH_P_IPV6):
371 ip6_hdr = skb_header_pointer(skb, offset + sizeof(*ethhdr),
372 sizeof(*ip6_hdr), &ip6_hdr_tmp);
373 if (!ip6_hdr)
374 return;
375 prio = (ipv6_get_dsfield(ip6_hdr) & 0xfc) >> 5;
376 break;
377 default:
378 return;
379 }
380
381 skb->priority = prio + 256;
382 }
383
batadv_recv_unhandled_packet(struct sk_buff * skb,struct batadv_hard_iface * recv_if)384 static int batadv_recv_unhandled_packet(struct sk_buff *skb,
385 struct batadv_hard_iface *recv_if)
386 {
387 kfree_skb(skb);
388
389 return NET_RX_DROP;
390 }
391
392 /* incoming packets with the batman ethertype received on any active hard
393 * interface
394 */
395
396 /**
397 * batadv_batman_skb_recv() - Handle incoming message from an hard interface
398 * @skb: the received packet
399 * @dev: the net device that the packet was received on
400 * @ptype: packet type of incoming packet (ETH_P_BATMAN)
401 * @orig_dev: the original receive net device (e.g. bonded device)
402 *
403 * Return: NET_RX_SUCCESS on success or NET_RX_DROP in case of failure
404 */
batadv_batman_skb_recv(struct sk_buff * skb,struct net_device * dev,struct packet_type * ptype,struct net_device * orig_dev)405 int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
406 struct packet_type *ptype,
407 struct net_device *orig_dev)
408 {
409 struct batadv_priv *bat_priv;
410 struct batadv_ogm_packet *batadv_ogm_packet;
411 struct batadv_hard_iface *hard_iface;
412 u8 idx;
413
414 hard_iface = container_of(ptype, struct batadv_hard_iface,
415 batman_adv_ptype);
416
417 /* Prevent processing a packet received on an interface which is getting
418 * shut down otherwise the packet may trigger de-reference errors
419 * further down in the receive path.
420 */
421 if (!kref_get_unless_zero(&hard_iface->refcount))
422 goto err_out;
423
424 skb = skb_share_check(skb, GFP_ATOMIC);
425
426 /* skb was released by skb_share_check() */
427 if (!skb)
428 goto err_put;
429
430 /* packet should hold at least type and version */
431 if (unlikely(!pskb_may_pull(skb, 2)))
432 goto err_free;
433
434 /* expect a valid ethernet header here. */
435 if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb)))
436 goto err_free;
437
438 if (!hard_iface->mesh_iface)
439 goto err_free;
440
441 bat_priv = netdev_priv(hard_iface->mesh_iface);
442
443 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
444 goto err_free;
445
446 /* discard frames on not active interfaces */
447 if (hard_iface->if_status != BATADV_IF_ACTIVE)
448 goto err_free;
449
450 batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data;
451
452 if (batadv_ogm_packet->version != BATADV_COMPAT_VERSION) {
453 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
454 "Drop packet: incompatible batman version (%i)\n",
455 batadv_ogm_packet->version);
456 goto err_free;
457 }
458
459 /* reset control block to avoid left overs from previous users */
460 memset(skb->cb, 0, sizeof(struct batadv_skb_cb));
461
462 idx = batadv_ogm_packet->packet_type;
463 (*batadv_rx_handler[idx])(skb, hard_iface);
464
465 batadv_hardif_put(hard_iface);
466
467 /* return NET_RX_SUCCESS in any case as we
468 * most probably dropped the packet for
469 * routing-logical reasons.
470 */
471 return NET_RX_SUCCESS;
472
473 err_free:
474 kfree_skb(skb);
475 err_put:
476 batadv_hardif_put(hard_iface);
477 err_out:
478 return NET_RX_DROP;
479 }
480
batadv_recv_handler_init(void)481 static void batadv_recv_handler_init(void)
482 {
483 int i;
484
485 for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++)
486 batadv_rx_handler[i] = batadv_recv_unhandled_packet;
487
488 for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++)
489 batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet;
490
491 /* compile time checks for sizes */
492 BUILD_BUG_ON(sizeof(struct batadv_bla_claim_dst) != 6);
493 BUILD_BUG_ON(sizeof(struct batadv_ogm_packet) != 24);
494 BUILD_BUG_ON(sizeof(struct batadv_icmp_header) != 20);
495 BUILD_BUG_ON(sizeof(struct batadv_icmp_packet) != 20);
496 BUILD_BUG_ON(sizeof(struct batadv_icmp_packet_rr) != 116);
497 BUILD_BUG_ON(sizeof(struct batadv_unicast_packet) != 10);
498 BUILD_BUG_ON(sizeof(struct batadv_unicast_4addr_packet) != 18);
499 BUILD_BUG_ON(sizeof(struct batadv_frag_packet) != 20);
500 BUILD_BUG_ON(sizeof(struct batadv_bcast_packet) != 14);
501 BUILD_BUG_ON(sizeof(struct batadv_coded_packet) != 46);
502 BUILD_BUG_ON(sizeof(struct batadv_unicast_tvlv_packet) != 20);
503 BUILD_BUG_ON(sizeof(struct batadv_tvlv_hdr) != 4);
504 BUILD_BUG_ON(sizeof(struct batadv_tvlv_gateway_data) != 8);
505 BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_vlan_data) != 8);
506 BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_change) != 12);
507 BUILD_BUG_ON(sizeof(struct batadv_tvlv_roam_adv) != 8);
508
509 i = sizeof_field(struct sk_buff, cb);
510 BUILD_BUG_ON(sizeof(struct batadv_skb_cb) > i);
511
512 /* broadcast packet */
513 batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet;
514 /* multicast packet */
515 batadv_rx_handler[BATADV_MCAST] = batadv_recv_mcast_packet;
516
517 /* unicast packets ... */
518 /* unicast with 4 addresses packet */
519 batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet;
520 /* unicast packet */
521 batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet;
522 /* unicast tvlv packet */
523 batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv;
524 /* batman icmp packet */
525 batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet;
526 /* Fragmented packets */
527 batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet;
528 }
529
530 /**
531 * batadv_recv_handler_register() - Register handler for batman-adv packet type
532 * @packet_type: batadv_packettype which should be handled
533 * @recv_handler: receive handler for the packet type
534 *
535 * Return: 0 on success or negative error number in case of failure
536 */
537 int
batadv_recv_handler_register(u8 packet_type,int (* recv_handler)(struct sk_buff *,struct batadv_hard_iface *))538 batadv_recv_handler_register(u8 packet_type,
539 int (*recv_handler)(struct sk_buff *,
540 struct batadv_hard_iface *))
541 {
542 int (*curr)(struct sk_buff *skb,
543 struct batadv_hard_iface *recv_if);
544 curr = batadv_rx_handler[packet_type];
545
546 if (curr != batadv_recv_unhandled_packet &&
547 curr != batadv_recv_unhandled_unicast_packet)
548 return -EBUSY;
549
550 batadv_rx_handler[packet_type] = recv_handler;
551 return 0;
552 }
553
554 /**
555 * batadv_recv_handler_unregister() - Unregister handler for packet type
556 * @packet_type: batadv_packettype which should no longer be handled
557 */
batadv_recv_handler_unregister(u8 packet_type)558 void batadv_recv_handler_unregister(u8 packet_type)
559 {
560 batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet;
561 }
562
563 /**
564 * batadv_get_vid() - extract the VLAN identifier from skb if any
565 * @skb: the buffer containing the packet
566 * @header_len: length of the batman header preceding the ethernet header
567 *
568 * Return: VID with the BATADV_VLAN_HAS_TAG flag when the packet embedded in the
569 * skb is vlan tagged. Otherwise BATADV_NO_FLAGS.
570 */
batadv_get_vid(struct sk_buff * skb,size_t header_len)571 unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len)
572 {
573 struct ethhdr *ethhdr = (struct ethhdr *)(skb->data + header_len);
574 struct vlan_ethhdr *vhdr;
575 unsigned short vid;
576
577 if (ethhdr->h_proto != htons(ETH_P_8021Q))
578 return BATADV_NO_FLAGS;
579
580 if (!pskb_may_pull(skb, header_len + VLAN_ETH_HLEN))
581 return BATADV_NO_FLAGS;
582
583 vhdr = (struct vlan_ethhdr *)(skb->data + header_len);
584 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
585
586 /* VID 0 is only used to indicate "priority tag" frames which only
587 * contain priority information and no VID.
588 */
589 if (vid == 0)
590 return BATADV_NO_FLAGS;
591
592 vid |= BATADV_VLAN_HAS_TAG;
593
594 return vid;
595 }
596
597 /**
598 * batadv_vlan_ap_isola_get() - return AP isolation status for the given vlan
599 * @bat_priv: the bat priv with all the mesh interface information
600 * @vid: the VLAN identifier for which the AP isolation attributed as to be
601 * looked up
602 *
603 * Return: true if AP isolation is on for the VLAN identified by vid, false
604 * otherwise
605 */
batadv_vlan_ap_isola_get(struct batadv_priv * bat_priv,unsigned short vid)606 bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid)
607 {
608 bool ap_isolation_enabled = false;
609 struct batadv_meshif_vlan *vlan;
610
611 /* if the AP isolation is requested on a VLAN, then check for its
612 * setting in the proper VLAN private data structure
613 */
614 vlan = batadv_meshif_vlan_get(bat_priv, vid);
615 if (vlan) {
616 ap_isolation_enabled = atomic_read(&vlan->ap_isolation);
617 batadv_meshif_vlan_put(vlan);
618 }
619
620 return ap_isolation_enabled;
621 }
622
623 /**
624 * batadv_throw_uevent() - Send an uevent with batman-adv specific env data
625 * @bat_priv: the bat priv with all the mesh interface information
626 * @type: subsystem type of event. Stored in uevent's BATTYPE
627 * @action: action type of event. Stored in uevent's BATACTION
628 * @data: string with additional information to the event (ignored for
629 * BATADV_UEV_DEL). Stored in uevent's BATDATA
630 *
631 * Return: 0 on success or negative error number in case of failure
632 */
batadv_throw_uevent(struct batadv_priv * bat_priv,enum batadv_uev_type type,enum batadv_uev_action action,const char * data)633 int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type,
634 enum batadv_uev_action action, const char *data)
635 {
636 int ret = -ENOMEM;
637 struct kobject *bat_kobj;
638 char *uevent_env[4] = { NULL, NULL, NULL, NULL };
639
640 bat_kobj = &bat_priv->mesh_iface->dev.kobj;
641
642 uevent_env[0] = kasprintf(GFP_ATOMIC,
643 "%s%s", BATADV_UEV_TYPE_VAR,
644 batadv_uev_type_str[type]);
645 if (!uevent_env[0])
646 goto report_error;
647
648 uevent_env[1] = kasprintf(GFP_ATOMIC,
649 "%s%s", BATADV_UEV_ACTION_VAR,
650 batadv_uev_action_str[action]);
651 if (!uevent_env[1])
652 goto free_first_env;
653
654 /* If the event is DEL, ignore the data field */
655 if (action != BATADV_UEV_DEL) {
656 uevent_env[2] = kasprintf(GFP_ATOMIC,
657 "%s%s", BATADV_UEV_DATA_VAR, data);
658 if (!uevent_env[2])
659 goto free_second_env;
660 }
661
662 ret = kobject_uevent_env(bat_kobj, KOBJ_CHANGE, uevent_env);
663 kfree(uevent_env[2]);
664 free_second_env:
665 kfree(uevent_env[1]);
666 free_first_env:
667 kfree(uevent_env[0]);
668
669 if (ret)
670 report_error:
671 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
672 "Impossible to send uevent for (%s,%s,%s) event (err: %d)\n",
673 batadv_uev_type_str[type],
674 batadv_uev_action_str[action],
675 (action == BATADV_UEV_DEL ? "NULL" : data), ret);
676 return ret;
677 }
678
679 module_init(batadv_init);
680 module_exit(batadv_exit);
681
682 MODULE_LICENSE("GPL");
683
684 MODULE_AUTHOR(BATADV_DRIVER_AUTHOR);
685 MODULE_DESCRIPTION(BATADV_DRIVER_DESC);
686 MODULE_VERSION(BATADV_SOURCE_VERSION);
687 MODULE_ALIAS_RTNL_LINK("batadv");
688 MODULE_ALIAS_GENL_FAMILY(BATADV_NL_NAME);
689