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/atomic.h>
10#include <linux/build_bug.h>
11#include <linux/byteorder/generic.h>
12#include <linux/container_of.h>
13#include <linux/crc32c.h>
14#include <linux/device.h>
15#include <linux/errno.h>
16#include <linux/genetlink.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/kernel.h>
24#include <linux/kobject.h>
25#include <linux/kref.h>
26#include <linux/list.h>
27#include <linux/minmax.h>
28#include <linux/module.h>
29#include <linux/netdevice.h>
30#include <linux/printk.h>
31#include <linux/rculist.h>
32#include <linux/rcupdate.h>
33#include <linux/skbuff.h>
34#include <linux/slab.h>
35#include <linux/spinlock.h>
36#include <linux/stddef.h>
37#include <linux/string.h>
38#include <linux/workqueue.h>
39#include <net/dsfield.h>
40#include <net/rtnetlink.h>
41#include <uapi/linux/batadv_packet.h>
42#include <uapi/linux/batman_adv.h>
43
44#include "bat_algo.h"
45#include "bat_iv_ogm.h"
46#include "bat_v.h"
47#include "bridge_loop_avoidance.h"
48#include "distributed-arp-table.h"
49#include "gateway_client.h"
50#include "gateway_common.h"
51#include "hard-interface.h"
52#include "log.h"
53#include "multicast.h"
54#include "netlink.h"
55#include "network-coding.h"
56#include "originator.h"
57#include "routing.h"
58#include "send.h"
59#include "soft-interface.h"
60#include "tp_meter.h"
61#include "translation-table.h"
62
63/* List manipulations on hardif_list have to be rtnl_lock()'ed,
64 * list traversals just rcu-locked
65 */
66struct list_head batadv_hardif_list;
67unsigned int batadv_hardif_generation;
68static int (*batadv_rx_handler[256])(struct sk_buff *skb,
69 struct batadv_hard_iface *recv_if);
70
71unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
72
73struct workqueue_struct *batadv_event_workqueue;
74
75static void batadv_recv_handler_init(void);
76
77#define BATADV_UEV_TYPE_VAR "BATTYPE="
78#define BATADV_UEV_ACTION_VAR "BATACTION="
79#define BATADV_UEV_DATA_VAR "BATDATA="
80
81static char *batadv_uev_action_str[] = {
82 "add",
83 "del",
84 "change",
85 "loopdetect",
86};
87
88static char *batadv_uev_type_str[] = {
89 "gw",
90 "bla",
91};
92
93static int __init batadv_init(void)
94{
95 int ret;
96
97 ret = batadv_tt_cache_init();
98 if (ret < 0)
99 return ret;
100
101 INIT_LIST_HEAD(list: &batadv_hardif_list);
102 batadv_algo_init();
103
104 batadv_recv_handler_init();
105
106 batadv_v_init();
107 batadv_iv_init();
108 batadv_nc_init();
109 batadv_tp_meter_init();
110
111 batadv_event_workqueue = create_singlethread_workqueue("bat_events");
112 if (!batadv_event_workqueue)
113 goto err_create_wq;
114
115 register_netdevice_notifier(nb: &batadv_hard_if_notifier);
116 rtnl_link_register(ops: &batadv_link_ops);
117 batadv_netlink_register();
118
119 pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n",
120 BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION);
121
122 return 0;
123
124err_create_wq:
125 batadv_tt_cache_destroy();
126
127 return -ENOMEM;
128}
129
130static void __exit batadv_exit(void)
131{
132 batadv_netlink_unregister();
133 rtnl_link_unregister(ops: &batadv_link_ops);
134 unregister_netdevice_notifier(nb: &batadv_hard_if_notifier);
135
136 destroy_workqueue(wq: batadv_event_workqueue);
137 batadv_event_workqueue = NULL;
138
139 rcu_barrier();
140
141 batadv_tt_cache_destroy();
142}
143
144/**
145 * batadv_mesh_init() - Initialize soft interface
146 * @soft_iface: netdev struct of the soft interface
147 *
148 * Return: 0 on success or negative error number in case of failure
149 */
150int batadv_mesh_init(struct net_device *soft_iface)
151{
152 struct batadv_priv *bat_priv = netdev_priv(dev: soft_iface);
153 int ret;
154
155 spin_lock_init(&bat_priv->forw_bat_list_lock);
156 spin_lock_init(&bat_priv->forw_bcast_list_lock);
157 spin_lock_init(&bat_priv->tt.changes_list_lock);
158 spin_lock_init(&bat_priv->tt.req_list_lock);
159 spin_lock_init(&bat_priv->tt.roam_list_lock);
160 spin_lock_init(&bat_priv->tt.last_changeset_lock);
161 spin_lock_init(&bat_priv->tt.commit_lock);
162 spin_lock_init(&bat_priv->gw.list_lock);
163#ifdef CONFIG_BATMAN_ADV_MCAST
164 spin_lock_init(&bat_priv->mcast.mla_lock);
165 spin_lock_init(&bat_priv->mcast.want_lists_lock);
166#endif
167 spin_lock_init(&bat_priv->tvlv.container_list_lock);
168 spin_lock_init(&bat_priv->tvlv.handler_list_lock);
169 spin_lock_init(&bat_priv->softif_vlan_list_lock);
170 spin_lock_init(&bat_priv->tp_list_lock);
171
172 INIT_HLIST_HEAD(&bat_priv->forw_bat_list);
173 INIT_HLIST_HEAD(&bat_priv->forw_bcast_list);
174 INIT_HLIST_HEAD(&bat_priv->gw.gateway_list);
175#ifdef CONFIG_BATMAN_ADV_MCAST
176 INIT_HLIST_HEAD(&bat_priv->mcast.want_all_unsnoopables_list);
177 INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv4_list);
178 INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv6_list);
179#endif
180 INIT_LIST_HEAD(list: &bat_priv->tt.changes_list);
181 INIT_HLIST_HEAD(&bat_priv->tt.req_list);
182 INIT_LIST_HEAD(list: &bat_priv->tt.roam_list);
183#ifdef CONFIG_BATMAN_ADV_MCAST
184 INIT_HLIST_HEAD(&bat_priv->mcast.mla_list);
185#endif
186 INIT_HLIST_HEAD(&bat_priv->tvlv.container_list);
187 INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list);
188 INIT_HLIST_HEAD(&bat_priv->softif_vlan_list);
189 INIT_HLIST_HEAD(&bat_priv->tp_list);
190
191 bat_priv->gw.generation = 0;
192
193 ret = batadv_originator_init(bat_priv);
194 if (ret < 0) {
195 atomic_set(v: &bat_priv->mesh_state, i: BATADV_MESH_DEACTIVATING);
196 goto err_orig;
197 }
198
199 ret = batadv_tt_init(bat_priv);
200 if (ret < 0) {
201 atomic_set(v: &bat_priv->mesh_state, i: BATADV_MESH_DEACTIVATING);
202 goto err_tt;
203 }
204
205 ret = batadv_v_mesh_init(bat_priv);
206 if (ret < 0) {
207 atomic_set(v: &bat_priv->mesh_state, i: BATADV_MESH_DEACTIVATING);
208 goto err_v;
209 }
210
211 ret = batadv_bla_init(bat_priv);
212 if (ret < 0) {
213 atomic_set(v: &bat_priv->mesh_state, i: BATADV_MESH_DEACTIVATING);
214 goto err_bla;
215 }
216
217 ret = batadv_dat_init(bat_priv);
218 if (ret < 0) {
219 atomic_set(v: &bat_priv->mesh_state, i: BATADV_MESH_DEACTIVATING);
220 goto err_dat;
221 }
222
223 ret = batadv_nc_mesh_init(bat_priv);
224 if (ret < 0) {
225 atomic_set(v: &bat_priv->mesh_state, i: BATADV_MESH_DEACTIVATING);
226 goto err_nc;
227 }
228
229 batadv_gw_init(bat_priv);
230 batadv_mcast_init(bat_priv);
231
232 atomic_set(v: &bat_priv->gw.reselect, i: 0);
233 atomic_set(v: &bat_priv->mesh_state, i: BATADV_MESH_ACTIVE);
234
235 return 0;
236
237err_nc:
238 batadv_dat_free(bat_priv);
239err_dat:
240 batadv_bla_free(bat_priv);
241err_bla:
242 batadv_v_mesh_free(bat_priv);
243err_v:
244 batadv_tt_free(bat_priv);
245err_tt:
246 batadv_originator_free(bat_priv);
247err_orig:
248 batadv_purge_outstanding_packets(bat_priv, NULL);
249 atomic_set(v: &bat_priv->mesh_state, i: BATADV_MESH_INACTIVE);
250
251 return ret;
252}
253
254/**
255 * batadv_mesh_free() - Deinitialize soft interface
256 * @soft_iface: netdev struct of the soft interface
257 */
258void batadv_mesh_free(struct net_device *soft_iface)
259{
260 struct batadv_priv *bat_priv = netdev_priv(dev: soft_iface);
261
262 atomic_set(v: &bat_priv->mesh_state, i: BATADV_MESH_DEACTIVATING);
263
264 batadv_purge_outstanding_packets(bat_priv, NULL);
265
266 batadv_gw_node_free(bat_priv);
267
268 batadv_v_mesh_free(bat_priv);
269 batadv_nc_mesh_free(bat_priv);
270 batadv_dat_free(bat_priv);
271 batadv_bla_free(bat_priv);
272
273 batadv_mcast_free(bat_priv);
274
275 /* Free the TT and the originator tables only after having terminated
276 * all the other depending components which may use these structures for
277 * their purposes.
278 */
279 batadv_tt_free(bat_priv);
280
281 /* Since the originator table clean up routine is accessing the TT
282 * tables as well, it has to be invoked after the TT tables have been
283 * freed and marked as empty. This ensures that no cleanup RCU callbacks
284 * accessing the TT data are scheduled for later execution.
285 */
286 batadv_originator_free(bat_priv);
287
288 batadv_gw_free(bat_priv);
289
290 free_percpu(pdata: bat_priv->bat_counters);
291 bat_priv->bat_counters = NULL;
292
293 atomic_set(v: &bat_priv->mesh_state, i: BATADV_MESH_INACTIVE);
294}
295
296/**
297 * batadv_is_my_mac() - check if the given mac address belongs to any of the
298 * real interfaces in the current mesh
299 * @bat_priv: the bat priv with all the soft interface information
300 * @addr: the address to check
301 *
302 * Return: 'true' if the mac address was found, false otherwise.
303 */
304bool batadv_is_my_mac(struct batadv_priv *bat_priv, const u8 *addr)
305{
306 const struct batadv_hard_iface *hard_iface;
307 bool is_my_mac = false;
308
309 rcu_read_lock();
310 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
311 if (hard_iface->if_status != BATADV_IF_ACTIVE)
312 continue;
313
314 if (hard_iface->soft_iface != bat_priv->soft_iface)
315 continue;
316
317 if (batadv_compare_eth(data1: hard_iface->net_dev->dev_addr, data2: addr)) {
318 is_my_mac = true;
319 break;
320 }
321 }
322 rcu_read_unlock();
323 return is_my_mac;
324}
325
326/**
327 * batadv_max_header_len() - calculate maximum encapsulation overhead for a
328 * payload packet
329 *
330 * Return: the maximum encapsulation overhead in bytes.
331 */
332int batadv_max_header_len(void)
333{
334 int header_len = 0;
335
336 header_len = max_t(int, header_len,
337 sizeof(struct batadv_unicast_packet));
338 header_len = max_t(int, header_len,
339 sizeof(struct batadv_unicast_4addr_packet));
340 header_len = max_t(int, header_len,
341 sizeof(struct batadv_bcast_packet));
342
343#ifdef CONFIG_BATMAN_ADV_NC
344 header_len = max_t(int, header_len,
345 sizeof(struct batadv_coded_packet));
346#endif
347
348 return header_len + ETH_HLEN;
349}
350
351/**
352 * batadv_skb_set_priority() - sets skb priority according to packet content
353 * @skb: the packet to be sent
354 * @offset: offset to the packet content
355 *
356 * This function sets a value between 256 and 263 (802.1d priority), which
357 * can be interpreted by the cfg80211 or other drivers.
358 */
359void batadv_skb_set_priority(struct sk_buff *skb, int offset)
360{
361 struct iphdr ip_hdr_tmp, *ip_hdr;
362 struct ipv6hdr ip6_hdr_tmp, *ip6_hdr;
363 struct ethhdr ethhdr_tmp, *ethhdr;
364 struct vlan_ethhdr *vhdr, vhdr_tmp;
365 u32 prio;
366
367 /* already set, do nothing */
368 if (skb->priority >= 256 && skb->priority <= 263)
369 return;
370
371 ethhdr = skb_header_pointer(skb, offset, len: sizeof(*ethhdr), buffer: &ethhdr_tmp);
372 if (!ethhdr)
373 return;
374
375 switch (ethhdr->h_proto) {
376 case htons(ETH_P_8021Q):
377 vhdr = skb_header_pointer(skb, offset: offset + sizeof(*vhdr),
378 len: sizeof(*vhdr), buffer: &vhdr_tmp);
379 if (!vhdr)
380 return;
381 prio = ntohs(vhdr->h_vlan_TCI) & VLAN_PRIO_MASK;
382 prio = prio >> VLAN_PRIO_SHIFT;
383 break;
384 case htons(ETH_P_IP):
385 ip_hdr = skb_header_pointer(skb, offset: offset + sizeof(*ethhdr),
386 len: sizeof(*ip_hdr), buffer: &ip_hdr_tmp);
387 if (!ip_hdr)
388 return;
389 prio = (ipv4_get_dsfield(iph: ip_hdr) & 0xfc) >> 5;
390 break;
391 case htons(ETH_P_IPV6):
392 ip6_hdr = skb_header_pointer(skb, offset: offset + sizeof(*ethhdr),
393 len: sizeof(*ip6_hdr), buffer: &ip6_hdr_tmp);
394 if (!ip6_hdr)
395 return;
396 prio = (ipv6_get_dsfield(ipv6h: ip6_hdr) & 0xfc) >> 5;
397 break;
398 default:
399 return;
400 }
401
402 skb->priority = prio + 256;
403}
404
405static int batadv_recv_unhandled_packet(struct sk_buff *skb,
406 struct batadv_hard_iface *recv_if)
407{
408 kfree_skb(skb);
409
410 return NET_RX_DROP;
411}
412
413/* incoming packets with the batman ethertype received on any active hard
414 * interface
415 */
416
417/**
418 * batadv_batman_skb_recv() - Handle incoming message from an hard interface
419 * @skb: the received packet
420 * @dev: the net device that the packet was received on
421 * @ptype: packet type of incoming packet (ETH_P_BATMAN)
422 * @orig_dev: the original receive net device (e.g. bonded device)
423 *
424 * Return: NET_RX_SUCCESS on success or NET_RX_DROP in case of failure
425 */
426int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
427 struct packet_type *ptype,
428 struct net_device *orig_dev)
429{
430 struct batadv_priv *bat_priv;
431 struct batadv_ogm_packet *batadv_ogm_packet;
432 struct batadv_hard_iface *hard_iface;
433 u8 idx;
434
435 hard_iface = container_of(ptype, struct batadv_hard_iface,
436 batman_adv_ptype);
437
438 /* Prevent processing a packet received on an interface which is getting
439 * shut down otherwise the packet may trigger de-reference errors
440 * further down in the receive path.
441 */
442 if (!kref_get_unless_zero(kref: &hard_iface->refcount))
443 goto err_out;
444
445 skb = skb_share_check(skb, GFP_ATOMIC);
446
447 /* skb was released by skb_share_check() */
448 if (!skb)
449 goto err_put;
450
451 /* packet should hold at least type and version */
452 if (unlikely(!pskb_may_pull(skb, 2)))
453 goto err_free;
454
455 /* expect a valid ethernet header here. */
456 if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb)))
457 goto err_free;
458
459 if (!hard_iface->soft_iface)
460 goto err_free;
461
462 bat_priv = netdev_priv(dev: hard_iface->soft_iface);
463
464 if (atomic_read(v: &bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
465 goto err_free;
466
467 /* discard frames on not active interfaces */
468 if (hard_iface->if_status != BATADV_IF_ACTIVE)
469 goto err_free;
470
471 batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data;
472
473 if (batadv_ogm_packet->version != BATADV_COMPAT_VERSION) {
474 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
475 "Drop packet: incompatible batman version (%i)\n",
476 batadv_ogm_packet->version);
477 goto err_free;
478 }
479
480 /* reset control block to avoid left overs from previous users */
481 memset(skb->cb, 0, sizeof(struct batadv_skb_cb));
482
483 idx = batadv_ogm_packet->packet_type;
484 (*batadv_rx_handler[idx])(skb, hard_iface);
485
486 batadv_hardif_put(hard_iface);
487
488 /* return NET_RX_SUCCESS in any case as we
489 * most probably dropped the packet for
490 * routing-logical reasons.
491 */
492 return NET_RX_SUCCESS;
493
494err_free:
495 kfree_skb(skb);
496err_put:
497 batadv_hardif_put(hard_iface);
498err_out:
499 return NET_RX_DROP;
500}
501
502static void batadv_recv_handler_init(void)
503{
504 int i;
505
506 for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++)
507 batadv_rx_handler[i] = batadv_recv_unhandled_packet;
508
509 for (i = BATADV_UNICAST_MIN; i <= BATADV_UNICAST_MAX; i++)
510 batadv_rx_handler[i] = batadv_recv_unhandled_unicast_packet;
511
512 /* compile time checks for sizes */
513 BUILD_BUG_ON(sizeof(struct batadv_bla_claim_dst) != 6);
514 BUILD_BUG_ON(sizeof(struct batadv_ogm_packet) != 24);
515 BUILD_BUG_ON(sizeof(struct batadv_icmp_header) != 20);
516 BUILD_BUG_ON(sizeof(struct batadv_icmp_packet) != 20);
517 BUILD_BUG_ON(sizeof(struct batadv_icmp_packet_rr) != 116);
518 BUILD_BUG_ON(sizeof(struct batadv_unicast_packet) != 10);
519 BUILD_BUG_ON(sizeof(struct batadv_unicast_4addr_packet) != 18);
520 BUILD_BUG_ON(sizeof(struct batadv_frag_packet) != 20);
521 BUILD_BUG_ON(sizeof(struct batadv_bcast_packet) != 14);
522 BUILD_BUG_ON(sizeof(struct batadv_coded_packet) != 46);
523 BUILD_BUG_ON(sizeof(struct batadv_unicast_tvlv_packet) != 20);
524 BUILD_BUG_ON(sizeof(struct batadv_tvlv_hdr) != 4);
525 BUILD_BUG_ON(sizeof(struct batadv_tvlv_gateway_data) != 8);
526 BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_vlan_data) != 8);
527 BUILD_BUG_ON(sizeof(struct batadv_tvlv_tt_change) != 12);
528 BUILD_BUG_ON(sizeof(struct batadv_tvlv_roam_adv) != 8);
529
530 i = sizeof_field(struct sk_buff, cb);
531 BUILD_BUG_ON(sizeof(struct batadv_skb_cb) > i);
532
533 /* broadcast packet */
534 batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet;
535
536 /* unicast packets ... */
537 /* unicast with 4 addresses packet */
538 batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet;
539 /* unicast packet */
540 batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet;
541 /* unicast tvlv packet */
542 batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv;
543 /* batman icmp packet */
544 batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet;
545 /* Fragmented packets */
546 batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet;
547}
548
549/**
550 * batadv_recv_handler_register() - Register handler for batman-adv packet type
551 * @packet_type: batadv_packettype which should be handled
552 * @recv_handler: receive handler for the packet type
553 *
554 * Return: 0 on success or negative error number in case of failure
555 */
556int
557batadv_recv_handler_register(u8 packet_type,
558 int (*recv_handler)(struct sk_buff *,
559 struct batadv_hard_iface *))
560{
561 int (*curr)(struct sk_buff *skb,
562 struct batadv_hard_iface *recv_if);
563 curr = batadv_rx_handler[packet_type];
564
565 if (curr != batadv_recv_unhandled_packet &&
566 curr != batadv_recv_unhandled_unicast_packet)
567 return -EBUSY;
568
569 batadv_rx_handler[packet_type] = recv_handler;
570 return 0;
571}
572
573/**
574 * batadv_recv_handler_unregister() - Unregister handler for packet type
575 * @packet_type: batadv_packettype which should no longer be handled
576 */
577void batadv_recv_handler_unregister(u8 packet_type)
578{
579 batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet;
580}
581
582/**
583 * batadv_skb_crc32() - calculate CRC32 of the whole packet and skip bytes in
584 * the header
585 * @skb: skb pointing to fragmented socket buffers
586 * @payload_ptr: Pointer to position inside the head buffer of the skb
587 * marking the start of the data to be CRC'ed
588 *
589 * payload_ptr must always point to an address in the skb head buffer and not to
590 * a fragment.
591 *
592 * Return: big endian crc32c of the checksummed data
593 */
594__be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr)
595{
596 u32 crc = 0;
597 unsigned int from;
598 unsigned int to = skb->len;
599 struct skb_seq_state st;
600 const u8 *data;
601 unsigned int len;
602 unsigned int consumed = 0;
603
604 from = (unsigned int)(payload_ptr - skb->data);
605
606 skb_prepare_seq_read(skb, from, to, st: &st);
607 while ((len = skb_seq_read(consumed, data: &data, st: &st)) != 0) {
608 crc = crc32c(crc, address: data, length: len);
609 consumed += len;
610 }
611
612 return htonl(crc);
613}
614
615/**
616 * batadv_get_vid() - extract the VLAN identifier from skb if any
617 * @skb: the buffer containing the packet
618 * @header_len: length of the batman header preceding the ethernet header
619 *
620 * Return: VID with the BATADV_VLAN_HAS_TAG flag when the packet embedded in the
621 * skb is vlan tagged. Otherwise BATADV_NO_FLAGS.
622 */
623unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len)
624{
625 struct ethhdr *ethhdr = (struct ethhdr *)(skb->data + header_len);
626 struct vlan_ethhdr *vhdr;
627 unsigned short vid;
628
629 if (ethhdr->h_proto != htons(ETH_P_8021Q))
630 return BATADV_NO_FLAGS;
631
632 if (!pskb_may_pull(skb, len: header_len + VLAN_ETH_HLEN))
633 return BATADV_NO_FLAGS;
634
635 vhdr = (struct vlan_ethhdr *)(skb->data + header_len);
636 vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
637 vid |= BATADV_VLAN_HAS_TAG;
638
639 return vid;
640}
641
642/**
643 * batadv_vlan_ap_isola_get() - return AP isolation status for the given vlan
644 * @bat_priv: the bat priv with all the soft interface information
645 * @vid: the VLAN identifier for which the AP isolation attributed as to be
646 * looked up
647 *
648 * Return: true if AP isolation is on for the VLAN identified by vid, false
649 * otherwise
650 */
651bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid)
652{
653 bool ap_isolation_enabled = false;
654 struct batadv_softif_vlan *vlan;
655
656 /* if the AP isolation is requested on a VLAN, then check for its
657 * setting in the proper VLAN private data structure
658 */
659 vlan = batadv_softif_vlan_get(bat_priv, vid);
660 if (vlan) {
661 ap_isolation_enabled = atomic_read(v: &vlan->ap_isolation);
662 batadv_softif_vlan_put(vlan);
663 }
664
665 return ap_isolation_enabled;
666}
667
668/**
669 * batadv_throw_uevent() - Send an uevent with batman-adv specific env data
670 * @bat_priv: the bat priv with all the soft interface information
671 * @type: subsystem type of event. Stored in uevent's BATTYPE
672 * @action: action type of event. Stored in uevent's BATACTION
673 * @data: string with additional information to the event (ignored for
674 * BATADV_UEV_DEL). Stored in uevent's BATDATA
675 *
676 * Return: 0 on success or negative error number in case of failure
677 */
678int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type,
679 enum batadv_uev_action action, const char *data)
680{
681 int ret = -ENOMEM;
682 struct kobject *bat_kobj;
683 char *uevent_env[4] = { NULL, NULL, NULL, NULL };
684
685 bat_kobj = &bat_priv->soft_iface->dev.kobj;
686
687 uevent_env[0] = kasprintf(GFP_ATOMIC,
688 fmt: "%s%s", BATADV_UEV_TYPE_VAR,
689 batadv_uev_type_str[type]);
690 if (!uevent_env[0])
691 goto out;
692
693 uevent_env[1] = kasprintf(GFP_ATOMIC,
694 fmt: "%s%s", BATADV_UEV_ACTION_VAR,
695 batadv_uev_action_str[action]);
696 if (!uevent_env[1])
697 goto out;
698
699 /* If the event is DEL, ignore the data field */
700 if (action != BATADV_UEV_DEL) {
701 uevent_env[2] = kasprintf(GFP_ATOMIC,
702 fmt: "%s%s", BATADV_UEV_DATA_VAR, data);
703 if (!uevent_env[2])
704 goto out;
705 }
706
707 ret = kobject_uevent_env(kobj: bat_kobj, action: KOBJ_CHANGE, envp: uevent_env);
708out:
709 kfree(objp: uevent_env[0]);
710 kfree(objp: uevent_env[1]);
711 kfree(objp: uevent_env[2]);
712
713 if (ret)
714 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
715 "Impossible to send uevent for (%s,%s,%s) event (err: %d)\n",
716 batadv_uev_type_str[type],
717 batadv_uev_action_str[action],
718 (action == BATADV_UEV_DEL ? "NULL" : data), ret);
719 return ret;
720}
721
722module_init(batadv_init);
723module_exit(batadv_exit);
724
725MODULE_LICENSE("GPL");
726
727MODULE_AUTHOR(BATADV_DRIVER_AUTHOR);
728MODULE_DESCRIPTION(BATADV_DRIVER_DESC);
729MODULE_VERSION(BATADV_SOURCE_VERSION);
730MODULE_ALIAS_RTNL_LINK("batadv");
731MODULE_ALIAS_GENL_FAMILY(BATADV_NL_NAME);
732

source code of linux/net/batman-adv/main.c