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x86/msr-index: Cleanup bit defines
[mirror_ubuntu-bionic-kernel.git] / net / l2tp / l2tp_netlink.c
CommitLineData
309795f4
JC		 1/*
2 * L2TP netlink layer, for management
3 *
4 * Copyright (c) 2008,2009,2010 Katalix Systems Ltd
5 *
6 * Partly based on the IrDA nelink implementation
7 * (see net/irda/irnetlink.c) which is:
8 * Copyright (c) 2007 Samuel Ortiz <samuel@sortiz.org>
9 * which is in turn partly based on the wireless netlink code:
10 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 */
16
a4ca44fa
JP		 17#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18
309795f4
JC		 19#include <net/sock.h>
20#include <net/genetlink.h>
21#include <net/udp.h>
22#include <linux/in.h>
23#include <linux/udp.h>
24#include <linux/socket.h>
25#include <linux/module.h>
26#include <linux/list.h>
27#include <net/net_namespace.h>
28
29#include <linux/l2tp.h>
30
31#include "l2tp_core.h"
32
33
489111e5 34static struct genl_family l2tp_nl_family;
309795f4 35
33f72e6f
BH		 36static const struct genl_multicast_group l2tp_multicast_group[] = {
37 {
38 .name = L2TP_GENL_MCGROUP,
39 },
40};
41
42static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq,
43 int flags, struct l2tp_tunnel *tunnel, u8 cmd);
44static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq,
45 int flags, struct l2tp_session *session,
46 u8 cmd);
47
309795f4
JC		 48/* Accessed under genl lock */
49static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX];
50
a4346210 51static struct l2tp_session *l2tp_nl_session_get(struct genl_info *info)
309795f4
JC		 52{
53 u32 tunnel_id;
54 u32 session_id;
55 char *ifname;
56 struct l2tp_tunnel *tunnel;
57 struct l2tp_session *session = NULL;
58 struct net *net = genl_info_net(info);
59
60 if (info->attrs[L2TP_ATTR_IFNAME]) {
61 ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
a4346210 62 session = l2tp_session_get_by_ifname(net, ifname);
309795f4
JC		 63 } else if ((info->attrs[L2TP_ATTR_SESSION_ID]) &&
64 (info->attrs[L2TP_ATTR_CONN_ID])) {
65 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
66 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
54652eb1
GN		 67 tunnel = l2tp_tunnel_get(net, tunnel_id);
68 if (tunnel) {
a4346210 69 session = l2tp_session_get(net, tunnel, session_id);
54652eb1
GN		 70 l2tp_tunnel_dec_refcount(tunnel);
71 }
309795f4
JC		 72 }
73
74 return session;
75}
76
77static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
78{
79 struct sk_buff *msg;
80 void *hdr;
81 int ret = -ENOBUFS;
82
58050fce 83 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
309795f4
JC		 84 if (!msg) {
85 ret = -ENOMEM;
86 goto out;
87 }
88
15e47304 89 hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
309795f4 90 &l2tp_nl_family, 0, L2TP_CMD_NOOP);
7f8436a1
WY		 91 if (!hdr) {
92 ret = -EMSGSIZE;
309795f4
JC		 93 goto err_out;
94 }
95
96 genlmsg_end(msg, hdr);
97
15e47304 98 return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
309795f4
JC		 99
100err_out:
101 nlmsg_free(msg);
102
103out:
104 return ret;
105}
106
33f72e6f
BH		 107static int l2tp_tunnel_notify(struct genl_family *family,
108 struct genl_info *info,
109 struct l2tp_tunnel *tunnel,
110 u8 cmd)
111{
112 struct sk_buff *msg;
113 int ret;
114
115 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
116 if (!msg)
117 return -ENOMEM;
118
119 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
120 NLM_F_ACK, tunnel, cmd);
121
853effc5
MT		 122 if (ret >= 0) {
123 ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
124 /* We don't care if no one is listening */
125 if (ret == -ESRCH)
126 ret = 0;
127 return ret;
128 }
33f72e6f
BH		 129
130 nlmsg_free(msg);
131
132 return ret;
133}
134
135static int l2tp_session_notify(struct genl_family *family,
136 struct genl_info *info,
137 struct l2tp_session *session,
138 u8 cmd)
139{
140 struct sk_buff *msg;
141 int ret;
142
143 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
144 if (!msg)
145 return -ENOMEM;
146
147 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
148 NLM_F_ACK, session, cmd);
149
853effc5
MT		 150 if (ret >= 0) {
151 ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
152 /* We don't care if no one is listening */
153 if (ret == -ESRCH)
154 ret = 0;
155 return ret;
156 }
33f72e6f
BH		 157
158 nlmsg_free(msg);
159
160 return ret;
161}
162
309795f4
JC		 163static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info)
164{
165 u32 tunnel_id;
166 u32 peer_tunnel_id;
167 int proto_version;
168 int fd;
169 int ret = 0;
170 struct l2tp_tunnel_cfg cfg = { 0, };
171 struct l2tp_tunnel *tunnel;
172 struct net *net = genl_info_net(info);
173
174 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
175 ret = -EINVAL;
176 goto out;
177 }
178 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
179
180 if (!info->attrs[L2TP_ATTR_PEER_CONN_ID]) {
181 ret = -EINVAL;
182 goto out;
183 }
184 peer_tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_CONN_ID]);
185
186 if (!info->attrs[L2TP_ATTR_PROTO_VERSION]) {
187 ret = -EINVAL;
188 goto out;
189 }
190 proto_version = nla_get_u8(info->attrs[L2TP_ATTR_PROTO_VERSION]);
191
192 if (!info->attrs[L2TP_ATTR_ENCAP_TYPE]) {
193 ret = -EINVAL;
194 goto out;
195 }
196 cfg.encap = nla_get_u16(info->attrs[L2TP_ATTR_ENCAP_TYPE]);
197
789a4a2c
JC		 198 fd = -1;
199 if (info->attrs[L2TP_ATTR_FD]) {
200 fd = nla_get_u32(info->attrs[L2TP_ATTR_FD]);
201 } else {
f9bac8df
CE		 202#if IS_ENABLED(CONFIG_IPV6)
203 if (info->attrs[L2TP_ATTR_IP6_SADDR] &&
204 info->attrs[L2TP_ATTR_IP6_DADDR]) {
205 cfg.local_ip6 = nla_data(
206 info->attrs[L2TP_ATTR_IP6_SADDR]);
207 cfg.peer_ip6 = nla_data(
208 info->attrs[L2TP_ATTR_IP6_DADDR]);
209 } else
210#endif
211 if (info->attrs[L2TP_ATTR_IP_SADDR] &&
212 info->attrs[L2TP_ATTR_IP_DADDR]) {
67b61f6c 213 cfg.local_ip.s_addr = nla_get_in_addr(
f9bac8df 214 info->attrs[L2TP_ATTR_IP_SADDR]);
67b61f6c 215 cfg.peer_ip.s_addr = nla_get_in_addr(
f9bac8df
CE		 216 info->attrs[L2TP_ATTR_IP_DADDR]);
217 } else {
218 ret = -EINVAL;
219 goto out;
220 }
789a4a2c
JC		 221 if (info->attrs[L2TP_ATTR_UDP_SPORT])
222 cfg.local_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_SPORT]);
223 if (info->attrs[L2TP_ATTR_UDP_DPORT])
224 cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]);
57ceb861
AST		 225 cfg.use_udp_checksums = nla_get_flag(
226 info->attrs[L2TP_ATTR_UDP_CSUM]);
6b649fea
TH		 227
228#if IS_ENABLED(CONFIG_IPV6)
57ceb861
AST		 229 cfg.udp6_zero_tx_checksums = nla_get_flag(
230 info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX]);
231 cfg.udp6_zero_rx_checksums = nla_get_flag(
232 info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX]);
6b649fea 233#endif
309795f4 234 }
309795f4
JC		 235
236 if (info->attrs[L2TP_ATTR_DEBUG])
237 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
238
309795f4
JC		 239 ret = -EINVAL;
240 switch (cfg.encap) {
241 case L2TP_ENCAPTYPE_UDP:
242 case L2TP_ENCAPTYPE_IP:
243 ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id,
244 peer_tunnel_id, &cfg, &tunnel);
245 break;
246 }
247
98aa4345
GN		 248 if (ret < 0)
249 goto out;
250
251 l2tp_tunnel_inc_refcount(tunnel);
252 ret = l2tp_tunnel_register(tunnel, net, &cfg);
253 if (ret < 0) {
254 kfree(tunnel);
255 goto out;
256 }
257 ret = l2tp_tunnel_notify(&l2tp_nl_family, info, tunnel,
258 L2TP_CMD_TUNNEL_CREATE);
259 l2tp_tunnel_dec_refcount(tunnel);
260
309795f4
JC		 261out:
262 return ret;
263}
264
265static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
266{
267 struct l2tp_tunnel *tunnel;
268 u32 tunnel_id;
269 int ret = 0;
270 struct net *net = genl_info_net(info);
271
272 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
273 ret = -EINVAL;
274 goto out;
275 }
276 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
277
bb0a32ce
GN		 278 tunnel = l2tp_tunnel_get(net, tunnel_id);
279 if (!tunnel) {
309795f4
JC		 280 ret = -ENODEV;
281 goto out;
282 }
283
33f72e6f
BH		 284 l2tp_tunnel_notify(&l2tp_nl_family, info,
285 tunnel, L2TP_CMD_TUNNEL_DELETE);
286
4dc12ffe 287 l2tp_tunnel_delete(tunnel);
309795f4 288
bb0a32ce
GN		 289 l2tp_tunnel_dec_refcount(tunnel);
290
309795f4
JC		 291out:
292 return ret;
293}
294
295static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info)
296{
297 struct l2tp_tunnel *tunnel;
298 u32 tunnel_id;
299 int ret = 0;
300 struct net *net = genl_info_net(info);
301
302 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
303 ret = -EINVAL;
304 goto out;
305 }
306 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
307
8c0e4215
GN		 308 tunnel = l2tp_tunnel_get(net, tunnel_id);
309 if (!tunnel) {
309795f4
JC		 310 ret = -ENODEV;
311 goto out;
312 }
313
314 if (info->attrs[L2TP_ATTR_DEBUG])
315 tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
316
33f72e6f
BH		 317 ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
318 tunnel, L2TP_CMD_TUNNEL_MODIFY);
319
8c0e4215
GN		 320 l2tp_tunnel_dec_refcount(tunnel);
321
309795f4
JC		 322out:
323 return ret;
324}
325
15e47304 326static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
33f72e6f 327 struct l2tp_tunnel *tunnel, u8 cmd)
309795f4
JC		 328{
329 void *hdr;
330 struct nlattr *nest;
331 struct sock *sk = NULL;
332 struct inet_sock *inet;
f9bac8df
CE		 333#if IS_ENABLED(CONFIG_IPV6)
334 struct ipv6_pinfo *np = NULL;
335#endif
309795f4 336
33f72e6f 337 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
7f8436a1
WY		 338 if (!hdr)
339 return -EMSGSIZE;
309795f4 340
60aed2ab
DM		 341 if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) ||
342 nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
343 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
344 nla_put_u32(skb, L2TP_ATTR_DEBUG, tunnel->debug) ||
345 nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap))
346 goto nla_put_failure;
309795f4
JC		 347
348 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
349 if (nest == NULL)
350 goto nla_put_failure;
351
1c714a92
ND		 352 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
353 atomic_long_read(&tunnel->stats.tx_packets),
354 L2TP_ATTR_STATS_PAD) ||
355 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
356 atomic_long_read(&tunnel->stats.tx_bytes),
357 L2TP_ATTR_STATS_PAD) ||
358 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
359 atomic_long_read(&tunnel->stats.tx_errors),
360 L2TP_ATTR_STATS_PAD) ||
361 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
362 atomic_long_read(&tunnel->stats.rx_packets),
363 L2TP_ATTR_STATS_PAD) ||
364 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
365 atomic_long_read(&tunnel->stats.rx_bytes),
366 L2TP_ATTR_STATS_PAD) ||
367 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
368 atomic_long_read(&tunnel->stats.rx_seq_discards),
369 L2TP_ATTR_STATS_PAD) ||
370 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
371 atomic_long_read(&tunnel->stats.rx_oos_packets),
372 L2TP_ATTR_STATS_PAD) ||
373 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
374 atomic_long_read(&tunnel->stats.rx_errors),
375 L2TP_ATTR_STATS_PAD))
60aed2ab 376 goto nla_put_failure;
309795f4
JC		 377 nla_nest_end(skb, nest);
378
379 sk = tunnel->sock;
380 if (!sk)
381 goto out;
382
f9bac8df
CE		 383#if IS_ENABLED(CONFIG_IPV6)
384 if (sk->sk_family == AF_INET6)
385 np = inet6_sk(sk);
386#endif
387
309795f4
JC		 388 inet = inet_sk(sk);
389
390 switch (tunnel->encap) {
391 case L2TP_ENCAPTYPE_UDP:
7ff516ff
AST		 392 switch (sk->sk_family) {
393 case AF_INET:
394 if (nla_put_u8(skb, L2TP_ATTR_UDP_CSUM, !sk->sk_no_check_tx))
395 goto nla_put_failure;
396 break;
97b7af09
AST		 397#if IS_ENABLED(CONFIG_IPV6)
398 case AF_INET6:
399 if (udp_get_no_check6_tx(sk) &&
400 nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_TX))
401 goto nla_put_failure;
402 if (udp_get_no_check6_rx(sk) &&
403 nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_RX))
404 goto nla_put_failure;
405 break;
406#endif
7ff516ff 407 }
60aed2ab 408 if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) ||
7ff516ff 409 nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)))
60aed2ab 410 goto nla_put_failure;
be070c77 411 /* fall through */
309795f4 412 case L2TP_ENCAPTYPE_IP:
f9bac8df
CE		 413#if IS_ENABLED(CONFIG_IPV6)
414 if (np) {
930345ea
JB		 415 if (nla_put_in6_addr(skb, L2TP_ATTR_IP6_SADDR,
416 &np->saddr) ||
417 nla_put_in6_addr(skb, L2TP_ATTR_IP6_DADDR,
418 &sk->sk_v6_daddr))
f9bac8df
CE		 419 goto nla_put_failure;
420 } else
421#endif
930345ea
JB		 422 if (nla_put_in_addr(skb, L2TP_ATTR_IP_SADDR,
423 inet->inet_saddr) ||
424 nla_put_in_addr(skb, L2TP_ATTR_IP_DADDR,
425 inet->inet_daddr))
60aed2ab 426 goto nla_put_failure;
309795f4
JC		 427 break;
428 }
429
430out:
053c095a
JB		 431 genlmsg_end(skb, hdr);
432 return 0;
309795f4
JC		 433
434nla_put_failure:
435 genlmsg_cancel(skb, hdr);
436 return -1;
437}
438
439static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info)
440{
441 struct l2tp_tunnel *tunnel;
442 struct sk_buff *msg;
443 u32 tunnel_id;
444 int ret = -ENOBUFS;
445 struct net *net = genl_info_net(info);
446
447 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
448 ret = -EINVAL;
4e4b21da 449 goto err;
309795f4
JC		 450 }
451
452 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
453
58050fce 454 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
309795f4
JC		 455 if (!msg) {
456 ret = -ENOMEM;
4e4b21da
GN		 457 goto err;
458 }
459
460 tunnel = l2tp_tunnel_get(net, tunnel_id);
461 if (!tunnel) {
462 ret = -ENODEV;
463 goto err_nlmsg;
309795f4
JC		 464 }
465
15e47304 466 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
33f72e6f 467 NLM_F_ACK, tunnel, L2TP_CMD_TUNNEL_GET);
309795f4 468 if (ret < 0)
4e4b21da
GN		 469 goto err_nlmsg_tunnel;
470
471 l2tp_tunnel_dec_refcount(tunnel);
309795f4 472
15e47304 473 return genlmsg_unicast(net, msg, info->snd_portid);
309795f4 474
4e4b21da
GN		 475err_nlmsg_tunnel:
476 l2tp_tunnel_dec_refcount(tunnel);
477err_nlmsg:
309795f4 478 nlmsg_free(msg);
4e4b21da 479err:
309795f4
JC		 480 return ret;
481}
482
483static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)
484{
485 int ti = cb->args[0];
486 struct l2tp_tunnel *tunnel;
487 struct net *net = sock_net(skb->sk);
488
489 for (;;) {
03b699b0 490 tunnel = l2tp_tunnel_get_nth(net, ti);
309795f4
JC		 491 if (tunnel == NULL)
492 goto out;
493
15e47304 494 if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).portid,
309795f4 495 cb->nlh->nlmsg_seq, NLM_F_MULTI,
03b699b0
GN		 496 tunnel, L2TP_CMD_TUNNEL_GET) < 0) {
497 l2tp_tunnel_dec_refcount(tunnel);
309795f4 498 goto out;
03b699b0
GN		 499 }
500 l2tp_tunnel_dec_refcount(tunnel);
309795f4
JC		 501
502 ti++;
503 }
504
505out:
506 cb->args[0] = ti;
507
508 return skb->len;
509}
510
511static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info)
512{
513 u32 tunnel_id = 0;
514 u32 session_id;
515 u32 peer_session_id;
516 int ret = 0;
517 struct l2tp_tunnel *tunnel;
518 struct l2tp_session *session;
519 struct l2tp_session_cfg cfg = { 0, };
520 struct net *net = genl_info_net(info);
521
522 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
523 ret = -EINVAL;
524 goto out;
525 }
e702c120 526
309795f4 527 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
e702c120 528 tunnel = l2tp_tunnel_get(net, tunnel_id);
309795f4
JC		 529 if (!tunnel) {
530 ret = -ENODEV;
531 goto out;
532 }
533
534 if (!info->attrs[L2TP_ATTR_SESSION_ID]) {
535 ret = -EINVAL;
e702c120 536 goto out_tunnel;
309795f4
JC		 537 }
538 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
309795f4
JC		 539
540 if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
541 ret = -EINVAL;
e702c120 542 goto out_tunnel;
309795f4
JC		 543 }
544 peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
545
546 if (!info->attrs[L2TP_ATTR_PW_TYPE]) {
547 ret = -EINVAL;
e702c120 548 goto out_tunnel;
309795f4
JC		 549 }
550 cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]);
551 if (cfg.pw_type >= __L2TP_PWTYPE_MAX) {
552 ret = -EINVAL;
e702c120 553 goto out_tunnel;
309795f4
JC		 554 }
555
556 if (tunnel->version > 2) {
557 if (info->attrs[L2TP_ATTR_OFFSET])
558 cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]);
559
560 if (info->attrs[L2TP_ATTR_DATA_SEQ])
561 cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
562
563 cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
564 if (info->attrs[L2TP_ATTR_L2SPEC_TYPE])
565 cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
566
567 cfg.l2specific_len = 4;
568 if (info->attrs[L2TP_ATTR_L2SPEC_LEN])
569 cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]);
570
571 if (info->attrs[L2TP_ATTR_COOKIE]) {
572 u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
573 if (len > 8) {
574 ret = -EINVAL;
e702c120 575 goto out_tunnel;
309795f4
JC		 576 }
577 cfg.cookie_len = len;
578 memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len);
579 }
580 if (info->attrs[L2TP_ATTR_PEER_COOKIE]) {
581 u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]);
582 if (len > 8) {
583 ret = -EINVAL;
e702c120 584 goto out_tunnel;
309795f4
JC		 585 }
586 cfg.peer_cookie_len = len;
587 memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len);
588 }
589 if (info->attrs[L2TP_ATTR_IFNAME])
590 cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
591
592 if (info->attrs[L2TP_ATTR_VLAN_ID])
593 cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]);
594 }
595
596 if (info->attrs[L2TP_ATTR_DEBUG])
597 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
598
599 if (info->attrs[L2TP_ATTR_RECV_SEQ])
600 cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
601
602 if (info->attrs[L2TP_ATTR_SEND_SEQ])
603 cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
604
605 if (info->attrs[L2TP_ATTR_LNS_MODE])
606 cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
607
608 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
609 cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
610
611 if (info->attrs[L2TP_ATTR_MTU])
612 cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
613
614 if (info->attrs[L2TP_ATTR_MRU])
615 cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
616
f1f39f91 617#ifdef CONFIG_MODULES
618 if (l2tp_nl_cmd_ops[cfg.pw_type] == NULL) {
619 genl_unlock();
620 request_module("net-l2tp-type-%u", cfg.pw_type);
621 genl_lock();
622 }
623#endif
309795f4
JC		 624 if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) ||
625 (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) {
626 ret = -EPROTONOSUPPORT;
e702c120 627 goto out_tunnel;
309795f4
JC		 628 }
629
630 /* Check that pseudowire-specific params are present */
631 switch (cfg.pw_type) {
632 case L2TP_PWTYPE_NONE:
633 break;
634 case L2TP_PWTYPE_ETH_VLAN:
635 if (!info->attrs[L2TP_ATTR_VLAN_ID]) {
636 ret = -EINVAL;
e702c120 637 goto out_tunnel;
309795f4
JC		 638 }
639 break;
640 case L2TP_PWTYPE_ETH:
641 break;
642 case L2TP_PWTYPE_PPP:
643 case L2TP_PWTYPE_PPP_AC:
644 break;
645 case L2TP_PWTYPE_IP:
646 default:
647 ret = -EPROTONOSUPPORT;
648 break;
649 }
650
f026bc29
GN		 651 ret = l2tp_nl_cmd_ops[cfg.pw_type]->session_create(net, tunnel,
652 session_id,
653 peer_session_id,
654 &cfg);
309795f4 655
33f72e6f 656 if (ret >= 0) {
a4346210 657 session = l2tp_session_get(net, tunnel, session_id);
5e6a9e5a 658 if (session) {
33f72e6f
BH		 659 ret = l2tp_session_notify(&l2tp_nl_family, info, session,
660 L2TP_CMD_SESSION_CREATE);
5e6a9e5a
GN		 661 l2tp_session_dec_refcount(session);
662 }
33f72e6f
BH		 663 }
664
e702c120
GN		 665out_tunnel:
666 l2tp_tunnel_dec_refcount(tunnel);
309795f4
JC		 667out:
668 return ret;
669}
670
671static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
672{
673 int ret = 0;
674 struct l2tp_session *session;
675 u16 pw_type;
676
a4346210 677 session = l2tp_nl_session_get(info);
309795f4
JC		 678 if (session == NULL) {
679 ret = -ENODEV;
680 goto out;
681 }
682
33f72e6f
BH		 683 l2tp_session_notify(&l2tp_nl_family, info,
684 session, L2TP_CMD_SESSION_DELETE);
685
309795f4
JC		 686 pw_type = session->pwtype;
687 if (pw_type < __L2TP_PWTYPE_MAX)
688 if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
689 ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session);
690
2777e2ab
GN		 691 l2tp_session_dec_refcount(session);
692
309795f4
JC		 693out:
694 return ret;
695}
696
697static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
698{
699 int ret = 0;
700 struct l2tp_session *session;
701
a4346210 702 session = l2tp_nl_session_get(info);
309795f4
JC		 703 if (session == NULL) {
704 ret = -ENODEV;
705 goto out;
706 }
707
708 if (info->attrs[L2TP_ATTR_DEBUG])
709 session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
710
711 if (info->attrs[L2TP_ATTR_DATA_SEQ])
712 session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
713
714 if (info->attrs[L2TP_ATTR_RECV_SEQ])
715 session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
716
bb5016ea 717 if (info->attrs[L2TP_ATTR_SEND_SEQ]) {
309795f4 718 session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
bb5016ea
GN		 719 l2tp_session_set_header_len(session, session->tunnel->version);
720 }
309795f4
JC		 721
722 if (info->attrs[L2TP_ATTR_LNS_MODE])
723 session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
724
725 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
726 session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
727
728 if (info->attrs[L2TP_ATTR_MTU])
729 session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
730
731 if (info->attrs[L2TP_ATTR_MRU])
732 session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
733
33f72e6f
BH		 734 ret = l2tp_session_notify(&l2tp_nl_family, info,
735 session, L2TP_CMD_SESSION_MODIFY);
736
2777e2ab
GN		 737 l2tp_session_dec_refcount(session);
738
309795f4
JC		 739out:
740 return ret;
741}
742
15e47304 743static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
33f72e6f 744 struct l2tp_session *session, u8 cmd)
309795f4
JC		 745{
746 void *hdr;
747 struct nlattr *nest;
748 struct l2tp_tunnel *tunnel = session->tunnel;
749 struct sock *sk = NULL;
750
751 sk = tunnel->sock;
752
33f72e6f 753 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
7f8436a1
WY		 754 if (!hdr)
755 return -EMSGSIZE;
309795f4 756
60aed2ab
DM		 757 if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
758 nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) ||
759 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
760 nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID,
761 session->peer_session_id) ||
762 nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) ||
763 nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype) ||
764 nla_put_u16(skb, L2TP_ATTR_MTU, session->mtu) ||
765 (session->mru &&
766 nla_put_u16(skb, L2TP_ATTR_MRU, session->mru)))
767 goto nla_put_failure;
768
e269ed26 769 if ((session->ifname[0] &&
60aed2ab
DM		 770 nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) ||
771 (session->cookie_len &&
772 nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len,
773 &session->cookie[0])) ||
774 (session->peer_cookie_len &&
775 nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len,
776 &session->peer_cookie[0])) ||
777 nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) ||
778 nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) ||
779 nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) ||
309795f4 780#ifdef CONFIG_XFRM
60aed2ab
DM		 781 (((sk) && (sk->sk_policy[0] || sk->sk_policy[1])) &&
782 nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) ||
309795f4 783#endif
60aed2ab 784 (session->reorder_timeout &&
2175d87c
ND		 785 nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT,
786 session->reorder_timeout, L2TP_ATTR_PAD)))
60aed2ab 787 goto nla_put_failure;
5de7aee5 788
309795f4
JC		 789 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
790 if (nest == NULL)
791 goto nla_put_failure;
5de7aee5 792
1c714a92
ND		 793 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
794 atomic_long_read(&session->stats.tx_packets),
795 L2TP_ATTR_STATS_PAD) ||
796 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
797 atomic_long_read(&session->stats.tx_bytes),
798 L2TP_ATTR_STATS_PAD) ||
799 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
800 atomic_long_read(&session->stats.tx_errors),
801 L2TP_ATTR_STATS_PAD) ||
802 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
803 atomic_long_read(&session->stats.rx_packets),
804 L2TP_ATTR_STATS_PAD) ||
805 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
806 atomic_long_read(&session->stats.rx_bytes),
807 L2TP_ATTR_STATS_PAD) ||
808 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
809 atomic_long_read(&session->stats.rx_seq_discards),
810 L2TP_ATTR_STATS_PAD) ||
811 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
812 atomic_long_read(&session->stats.rx_oos_packets),
813 L2TP_ATTR_STATS_PAD) ||
814 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
815 atomic_long_read(&session->stats.rx_errors),
816 L2TP_ATTR_STATS_PAD))
60aed2ab 817 goto nla_put_failure;
309795f4
JC		 818 nla_nest_end(skb, nest);
819
053c095a
JB		 820 genlmsg_end(skb, hdr);
821 return 0;
309795f4
JC		 822
823 nla_put_failure:
824 genlmsg_cancel(skb, hdr);
825 return -1;
826}
827
828static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
829{
830 struct l2tp_session *session;
831 struct sk_buff *msg;
832 int ret;
833
a4346210 834 session = l2tp_nl_session_get(info);
309795f4
JC		 835 if (session == NULL) {
836 ret = -ENODEV;
2777e2ab 837 goto err;
309795f4
JC		 838 }
839
58050fce 840 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
309795f4
JC		 841 if (!msg) {
842 ret = -ENOMEM;
2777e2ab 843 goto err_ref;
309795f4
JC		 844 }
845
15e47304 846 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
33f72e6f 847 0, session, L2TP_CMD_SESSION_GET);
309795f4 848 if (ret < 0)
2777e2ab 849 goto err_ref_msg;
309795f4 850
2777e2ab 851 ret = genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
309795f4 852
2777e2ab 853 l2tp_session_dec_refcount(session);
309795f4 854
2777e2ab
GN		 855 return ret;
856
857err_ref_msg:
858 nlmsg_free(msg);
859err_ref:
860 l2tp_session_dec_refcount(session);
861err:
309795f4
JC		 862 return ret;
863}
864
865static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
866{
867 struct net *net = sock_net(skb->sk);
868 struct l2tp_session *session;
869 struct l2tp_tunnel *tunnel = NULL;
870 int ti = cb->args[0];
871 int si = cb->args[1];
872
873 for (;;) {
874 if (tunnel == NULL) {
03b699b0 875 tunnel = l2tp_tunnel_get_nth(net, ti);
309795f4
JC		 876 if (tunnel == NULL)
877 goto out;
878 }
879
a4346210 880 session = l2tp_session_get_nth(tunnel, si);
309795f4
JC		 881 if (session == NULL) {
882 ti++;
03b699b0 883 l2tp_tunnel_dec_refcount(tunnel);
309795f4
JC		 884 tunnel = NULL;
885 si = 0;
886 continue;
887 }
888
15e47304 889 if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid,
309795f4 890 cb->nlh->nlmsg_seq, NLM_F_MULTI,
e08293a4
GN		 891 session, L2TP_CMD_SESSION_GET) < 0) {
892 l2tp_session_dec_refcount(session);
03b699b0 893 l2tp_tunnel_dec_refcount(tunnel);
309795f4 894 break;
e08293a4
GN		 895 }
896 l2tp_session_dec_refcount(session);
309795f4
JC		 897
898 si++;
899 }
900
901out:
902 cb->args[0] = ti;
903 cb->args[1] = si;
904
905 return skb->len;
906}
907
f5bb341e 908static const struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
309795f4
JC		 909 [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, },
910 [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
911 [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
912 [L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
913 [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
914 [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
915 [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
916 [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, },
917 [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, },
918 [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },
919 [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, },
920 [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },
921 [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },
922 [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, },
923 [L2TP_ATTR_DEBUG] = { .type = NLA_U32, },
924 [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, },
925 [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, },
926 [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, },
927 [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, },
928 [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
929 [L2TP_ATTR_FD] = { .type = NLA_U32, },
930 [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, },
931 [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, },
932 [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, },
933 [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, },
934 [L2TP_ATTR_MTU] = { .type = NLA_U16, },
935 [L2TP_ATTR_MRU] = { .type = NLA_U16, },
936 [L2TP_ATTR_STATS] = { .type = NLA_NESTED, },
f9bac8df
CE		 937 [L2TP_ATTR_IP6_SADDR] = {
938 .type = NLA_BINARY,
939 .len = sizeof(struct in6_addr),
940 },
941 [L2TP_ATTR_IP6_DADDR] = {
942 .type = NLA_BINARY,
943 .len = sizeof(struct in6_addr),
944 },
309795f4
JC		 945 [L2TP_ATTR_IFNAME] = {
946 .type = NLA_NUL_STRING,
947 .len = IFNAMSIZ - 1,
948 },
949 [L2TP_ATTR_COOKIE] = {
950 .type = NLA_BINARY,
951 .len = 8,
952 },
953 [L2TP_ATTR_PEER_COOKIE] = {
954 .type = NLA_BINARY,
955 .len = 8,
956 },
957};
958
4534de83 959static const struct genl_ops l2tp_nl_ops[] = {
309795f4
JC		 960 {
961 .cmd = L2TP_CMD_NOOP,
962 .doit = l2tp_nl_cmd_noop,
963 .policy = l2tp_nl_policy,
964 /* can be retrieved by unprivileged users */
965 },
966 {
967 .cmd = L2TP_CMD_TUNNEL_CREATE,
968 .doit = l2tp_nl_cmd_tunnel_create,
969 .policy = l2tp_nl_policy,
970 .flags = GENL_ADMIN_PERM,
971 },
972 {
973 .cmd = L2TP_CMD_TUNNEL_DELETE,
974 .doit = l2tp_nl_cmd_tunnel_delete,
975 .policy = l2tp_nl_policy,
976 .flags = GENL_ADMIN_PERM,
977 },
978 {
979 .cmd = L2TP_CMD_TUNNEL_MODIFY,
980 .doit = l2tp_nl_cmd_tunnel_modify,
981 .policy = l2tp_nl_policy,
982 .flags = GENL_ADMIN_PERM,
983 },
984 {
985 .cmd = L2TP_CMD_TUNNEL_GET,
986 .doit = l2tp_nl_cmd_tunnel_get,
987 .dumpit = l2tp_nl_cmd_tunnel_dump,
988 .policy = l2tp_nl_policy,
989 .flags = GENL_ADMIN_PERM,
990 },
991 {
992 .cmd = L2TP_CMD_SESSION_CREATE,
993 .doit = l2tp_nl_cmd_session_create,
994 .policy = l2tp_nl_policy,
995 .flags = GENL_ADMIN_PERM,
996 },
997 {
998 .cmd = L2TP_CMD_SESSION_DELETE,
999 .doit = l2tp_nl_cmd_session_delete,
1000 .policy = l2tp_nl_policy,
1001 .flags = GENL_ADMIN_PERM,
1002 },
1003 {
1004 .cmd = L2TP_CMD_SESSION_MODIFY,
1005 .doit = l2tp_nl_cmd_session_modify,
1006 .policy = l2tp_nl_policy,
1007 .flags = GENL_ADMIN_PERM,
1008 },
1009 {
1010 .cmd = L2TP_CMD_SESSION_GET,
1011 .doit = l2tp_nl_cmd_session_get,
1012 .dumpit = l2tp_nl_cmd_session_dump,
1013 .policy = l2tp_nl_policy,
1014 .flags = GENL_ADMIN_PERM,
1015 },
1016};
1017
56989f6d 1018static struct genl_family l2tp_nl_family __ro_after_init = {
489111e5
JB		 1019 .name = L2TP_GENL_NAME,
1020 .version = L2TP_GENL_VERSION,
1021 .hdrsize = 0,
1022 .maxattr = L2TP_ATTR_MAX,
1023 .netnsok = true,
1024 .module = THIS_MODULE,
1025 .ops = l2tp_nl_ops,
1026 .n_ops = ARRAY_SIZE(l2tp_nl_ops),
1027 .mcgrps = l2tp_multicast_group,
1028 .n_mcgrps = ARRAY_SIZE(l2tp_multicast_group),
1029};
1030
309795f4
JC		 1031int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
1032{
1033 int ret;
1034
1035 ret = -EINVAL;
1036 if (pw_type >= __L2TP_PWTYPE_MAX)
1037 goto err;
1038
1039 genl_lock();
1040 ret = -EBUSY;
1041 if (l2tp_nl_cmd_ops[pw_type])
1042 goto out;
1043
1044 l2tp_nl_cmd_ops[pw_type] = ops;
8cb49014 1045 ret = 0;
309795f4
JC		 1046
1047out:
1048 genl_unlock();
1049err:
8cb49014 1050 return ret;
309795f4
JC		 1051}
1052EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
1053
1054void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
1055{
1056 if (pw_type < __L2TP_PWTYPE_MAX) {
1057 genl_lock();
1058 l2tp_nl_cmd_ops[pw_type] = NULL;
1059 genl_unlock();
1060 }
1061}
1062EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
1063
56989f6d 1064static int __init l2tp_nl_init(void)
309795f4 1065{
a4ca44fa 1066 pr_info("L2TP netlink interface\n");
489111e5 1067 return genl_register_family(&l2tp_nl_family);
309795f4
JC		 1068}
1069
1070static void l2tp_nl_cleanup(void)
1071{
1072 genl_unregister_family(&l2tp_nl_family);
1073}
1074
1075module_init(l2tp_nl_init);
1076module_exit(l2tp_nl_cleanup);
1077
1078MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1079MODULE_DESCRIPTION("L2TP netlink");
1080MODULE_LICENSE("GPL");
1081MODULE_VERSION("1.0");
e9412c37 1082MODULE_ALIAS_GENL_FAMILY("l2tp");
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