1 /*
2 * L2TPv3 IP encapsulation support
3 *
4 * Copyright (c) 2008,2009,2010 Katalix Systems Ltd
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14 #include <asm/ioctls.h>
15 #include <linux/icmp.h>
16 #include <linux/module.h>
17 #include <linux/skbuff.h>
18 #include <linux/random.h>
19 #include <linux/socket.h>
20 #include <linux/l2tp.h>
21 #include <linux/in.h>
22 #include <net/sock.h>
23 #include <net/ip.h>
24 #include <net/icmp.h>
25 #include <net/udp.h>
26 #include <net/inet_common.h>
27 #include <net/inet_hashtables.h>
28 #include <net/tcp_states.h>
29 #include <net/protocol.h>
30 #include <net/xfrm.h>
31
32 #include "l2tp_core.h"
33
34 struct l2tp_ip_sock {
35 /* inet_sock has to be the first member of l2tp_ip_sock */
36 struct inet_sock inet;
37
38 u32 conn_id;
39 u32 peer_conn_id;
40 };
41
42 static DEFINE_RWLOCK(l2tp_ip_lock);
43 static struct hlist_head l2tp_ip_table;
44 static struct hlist_head l2tp_ip_bind_table;
45
46 static inline struct l2tp_ip_sock *l2tp_ip_sk(const struct sock *sk)
47 {
48 return (struct l2tp_ip_sock *)sk;
49 }
50
51 static struct sock *__l2tp_ip_bind_lookup(const struct net *net, __be32 laddr,
52 __be32 raddr, int dif, u32 tunnel_id)
53 {
54 struct sock *sk;
55
56 sk_for_each_bound(sk, &l2tp_ip_bind_table) {
57 const struct l2tp_ip_sock *l2tp = l2tp_ip_sk(sk);
58 const struct inet_sock *inet = inet_sk(sk);
59
60 if (!net_eq(sock_net(sk), net))
61 continue;
62
63 if (sk->sk_bound_dev_if && dif && sk->sk_bound_dev_if != dif)
64 continue;
65
66 if (inet->inet_rcv_saddr && laddr &&
67 inet->inet_rcv_saddr != laddr)
68 continue;
69
70 if (inet->inet_daddr && raddr && inet->inet_daddr != raddr)
71 continue;
72
73 if (l2tp->conn_id != tunnel_id)
74 continue;
75
76 goto found;
77 }
78
79 sk = NULL;
80 found:
81 return sk;
82 }
83
84 /* When processing receive frames, there are two cases to
85 * consider. Data frames consist of a non-zero session-id and an
86 * optional cookie. Control frames consist of a regular L2TP header
87 * preceded by 32-bits of zeros.
88 *
89 * L2TPv3 Session Header Over IP
90 *
91 * 0 1 2 3
92 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
93 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
94 * | Session ID |
95 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
96 * | Cookie (optional, maximum 64 bits)...
97 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
98 * |
99 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
100 *
101 * L2TPv3 Control Message Header Over IP
102 *
103 * 0 1 2 3
104 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
105 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
106 * | (32 bits of zeros) |
107 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
108 * |T|L|x|x|S|x|x|x|x|x|x|x| Ver | Length |
109 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
110 * | Control Connection ID |
111 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
112 * | Ns | Nr |
113 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
114 *
115 * All control frames are passed to userspace.
116 */
117 static int l2tp_ip_recv(struct sk_buff *skb)
118 {
119 struct net *net = dev_net(skb->dev);
120 struct sock *sk;
121 u32 session_id;
122 u32 tunnel_id;
123 unsigned char *ptr, *optr;
124 struct l2tp_session *session;
125 struct l2tp_tunnel *tunnel = NULL;
126 struct iphdr *iph;
127 int length;
128
129 if (!pskb_may_pull(skb, 4))
130 goto discard;
131
132 /* Point to L2TP header */
133 optr = ptr = skb->data;
134 session_id = ntohl(*((__be32 *) ptr));
135 ptr += 4;
136
137 /* RFC3931: L2TP/IP packets have the first 4 bytes containing
138 * the session_id. If it is 0, the packet is a L2TP control
139 * frame and the session_id value can be discarded.
140 */
141 if (session_id == 0) {
142 __skb_pull(skb, 4);
143 goto pass_up;
144 }
145
146 /* Ok, this is a data packet. Lookup the session. */
147 session = l2tp_session_get(net, session_id);
148 if (!session)
149 goto discard;
150
151 tunnel = session->tunnel;
152 if (!tunnel)
153 goto discard_sess;
154
155 /* Trace packet contents, if enabled */
156 if (tunnel->debug & L2TP_MSG_DATA) {
157 length = min(32u, skb->len);
158 if (!pskb_may_pull(skb, length))
159 goto discard_sess;
160
161 /* Point to L2TP header */
162 optr = ptr = skb->data;
163 ptr += 4;
164 pr_debug("%s: ip recv\n", tunnel->name);
165 print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, ptr, length);
166 }
167
168 if (l2tp_v3_ensure_opt_in_linear(session, skb, &ptr, &optr))
169 goto discard_sess;
170
171 l2tp_recv_common(session, skb, ptr, optr, 0, skb->len);
172 l2tp_session_dec_refcount(session);
173
174 return 0;
175
176 pass_up:
177 /* Get the tunnel_id from the L2TP header */
178 if (!pskb_may_pull(skb, 12))
179 goto discard;
180
181 if ((skb->data[0] & 0xc0) != 0xc0)
182 goto discard;
183
184 tunnel_id = ntohl(*(__be32 *) &skb->data[4]);
185 iph = (struct iphdr *)skb_network_header(skb);
186
187 read_lock_bh(&l2tp_ip_lock);
188 sk = __l2tp_ip_bind_lookup(net, iph->daddr, iph->saddr, inet_iif(skb),
189 tunnel_id);
190 if (!sk) {
191 read_unlock_bh(&l2tp_ip_lock);
192 goto discard;
193 }
194 sock_hold(sk);
195 read_unlock_bh(&l2tp_ip_lock);
196
197 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
198 goto discard_put;
199
200 nf_reset(skb);
201
202 return sk_receive_skb(sk, skb, 1);
203
204 discard_sess:
205 l2tp_session_dec_refcount(session);
206 goto discard;
207
208 discard_put:
209 sock_put(sk);
210
211 discard:
212 kfree_skb(skb);
213 return 0;
214 }
215
216 static int l2tp_ip_open(struct sock *sk)
217 {
218 /* Prevent autobind. We don't have ports. */
219 inet_sk(sk)->inet_num = IPPROTO_L2TP;
220
221 write_lock_bh(&l2tp_ip_lock);
222 sk_add_node(sk, &l2tp_ip_table);
223 write_unlock_bh(&l2tp_ip_lock);
224
225 return 0;
226 }
227
228 static void l2tp_ip_close(struct sock *sk, long timeout)
229 {
230 write_lock_bh(&l2tp_ip_lock);
231 hlist_del_init(&sk->sk_bind_node);
232 sk_del_node_init(sk);
233 write_unlock_bh(&l2tp_ip_lock);
234 sk_common_release(sk);
235 }
236
237 static void l2tp_ip_destroy_sock(struct sock *sk)
238 {
239 struct sk_buff *skb;
240 struct l2tp_tunnel *tunnel = sk->sk_user_data;
241
242 while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL)
243 kfree_skb(skb);
244
245 if (tunnel)
246 l2tp_tunnel_delete(tunnel);
247 }
248
249 static int l2tp_ip_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
250 {
251 struct inet_sock *inet = inet_sk(sk);
252 struct sockaddr_l2tpip *addr = (struct sockaddr_l2tpip *) uaddr;
253 struct net *net = sock_net(sk);
254 int ret;
255 int chk_addr_ret;
256
257 if (addr_len < sizeof(struct sockaddr_l2tpip))
258 return -EINVAL;
259 if (addr->l2tp_family != AF_INET)
260 return -EINVAL;
261
262 lock_sock(sk);
263
264 ret = -EINVAL;
265 if (!sock_flag(sk, SOCK_ZAPPED))
266 goto out;
267
268 if (sk->sk_state != TCP_CLOSE)
269 goto out;
270
271 chk_addr_ret = inet_addr_type(net, addr->l2tp_addr.s_addr);
272 ret = -EADDRNOTAVAIL;
273 if (addr->l2tp_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
274 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
275 goto out;
276
277 if (addr->l2tp_addr.s_addr)
278 inet->inet_rcv_saddr = inet->inet_saddr = addr->l2tp_addr.s_addr;
279 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
280 inet->inet_saddr = 0; /* Use device */
281
282 write_lock_bh(&l2tp_ip_lock);
283 if (__l2tp_ip_bind_lookup(net, addr->l2tp_addr.s_addr, 0,
284 sk->sk_bound_dev_if, addr->l2tp_conn_id)) {
285 write_unlock_bh(&l2tp_ip_lock);
286 ret = -EADDRINUSE;
287 goto out;
288 }
289
290 sk_dst_reset(sk);
291 l2tp_ip_sk(sk)->conn_id = addr->l2tp_conn_id;
292
293 sk_add_bind_node(sk, &l2tp_ip_bind_table);
294 sk_del_node_init(sk);
295 write_unlock_bh(&l2tp_ip_lock);
296
297 ret = 0;
298 sock_reset_flag(sk, SOCK_ZAPPED);
299
300 out:
301 release_sock(sk);
302
303 return ret;
304 }
305
306 static int l2tp_ip_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
307 {
308 struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *) uaddr;
309 int rc;
310
311 if (addr_len < sizeof(*lsa))
312 return -EINVAL;
313
314 if (ipv4_is_multicast(lsa->l2tp_addr.s_addr))
315 return -EINVAL;
316
317 lock_sock(sk);
318
319 /* Must bind first - autobinding does not work */
320 if (sock_flag(sk, SOCK_ZAPPED)) {
321 rc = -EINVAL;
322 goto out_sk;
323 }
324
325 rc = __ip4_datagram_connect(sk, uaddr, addr_len);
326 if (rc < 0)
327 goto out_sk;
328
329 l2tp_ip_sk(sk)->peer_conn_id = lsa->l2tp_conn_id;
330
331 write_lock_bh(&l2tp_ip_lock);
332 hlist_del_init(&sk->sk_bind_node);
333 sk_add_bind_node(sk, &l2tp_ip_bind_table);
334 write_unlock_bh(&l2tp_ip_lock);
335
336 out_sk:
337 release_sock(sk);
338
339 return rc;
340 }
341
342 static int l2tp_ip_disconnect(struct sock *sk, int flags)
343 {
344 if (sock_flag(sk, SOCK_ZAPPED))
345 return 0;
346
347 return __udp_disconnect(sk, flags);
348 }
349
350 static int l2tp_ip_getname(struct socket *sock, struct sockaddr *uaddr,
351 int peer)
352 {
353 struct sock *sk = sock->sk;
354 struct inet_sock *inet = inet_sk(sk);
355 struct l2tp_ip_sock *lsk = l2tp_ip_sk(sk);
356 struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *)uaddr;
357
358 memset(lsa, 0, sizeof(*lsa));
359 lsa->l2tp_family = AF_INET;
360 if (peer) {
361 if (!inet->inet_dport)
362 return -ENOTCONN;
363 lsa->l2tp_conn_id = lsk->peer_conn_id;
364 lsa->l2tp_addr.s_addr = inet->inet_daddr;
365 } else {
366 __be32 addr = inet->inet_rcv_saddr;
367 if (!addr)
368 addr = inet->inet_saddr;
369 lsa->l2tp_conn_id = lsk->conn_id;
370 lsa->l2tp_addr.s_addr = addr;
371 }
372 return sizeof(*lsa);
373 }
374
375 static int l2tp_ip_backlog_recv(struct sock *sk, struct sk_buff *skb)
376 {
377 int rc;
378
379 /* Charge it to the socket, dropping if the queue is full. */
380 rc = sock_queue_rcv_skb(sk, skb);
381 if (rc < 0)
382 goto drop;
383
384 return 0;
385
386 drop:
387 IP_INC_STATS(sock_net(sk), IPSTATS_MIB_INDISCARDS);
388 kfree_skb(skb);
389 return 0;
390 }
391
392 /* Userspace will call sendmsg() on the tunnel socket to send L2TP
393 * control frames.
394 */
395 static int l2tp_ip_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
396 {
397 struct sk_buff *skb;
398 int rc;
399 struct inet_sock *inet = inet_sk(sk);
400 struct rtable *rt = NULL;
401 struct flowi4 *fl4;
402 int connected = 0;
403 __be32 daddr;
404
405 lock_sock(sk);
406
407 rc = -ENOTCONN;
408 if (sock_flag(sk, SOCK_DEAD))
409 goto out;
410
411 /* Get and verify the address. */
412 if (msg->msg_name) {
413 DECLARE_SOCKADDR(struct sockaddr_l2tpip *, lip, msg->msg_name);
414 rc = -EINVAL;
415 if (msg->msg_namelen < sizeof(*lip))
416 goto out;
417
418 if (lip->l2tp_family != AF_INET) {
419 rc = -EAFNOSUPPORT;
420 if (lip->l2tp_family != AF_UNSPEC)
421 goto out;
422 }
423
424 daddr = lip->l2tp_addr.s_addr;
425 } else {
426 rc = -EDESTADDRREQ;
427 if (sk->sk_state != TCP_ESTABLISHED)
428 goto out;
429
430 daddr = inet->inet_daddr;
431 connected = 1;
432 }
433
434 /* Allocate a socket buffer */
435 rc = -ENOMEM;
436 skb = sock_wmalloc(sk, 2 + NET_SKB_PAD + sizeof(struct iphdr) +
437 4 + len, 0, GFP_KERNEL);
438 if (!skb)
439 goto error;
440
441 /* Reserve space for headers, putting IP header on 4-byte boundary. */
442 skb_reserve(skb, 2 + NET_SKB_PAD);
443 skb_reset_network_header(skb);
444 skb_reserve(skb, sizeof(struct iphdr));
445 skb_reset_transport_header(skb);
446
447 /* Insert 0 session_id */
448 *((__be32 *) skb_put(skb, 4)) = 0;
449
450 /* Copy user data into skb */
451 rc = memcpy_from_msg(skb_put(skb, len), msg, len);
452 if (rc < 0) {
453 kfree_skb(skb);
454 goto error;
455 }
456
457 fl4 = &inet->cork.fl.u.ip4;
458 if (connected)
459 rt = (struct rtable *) __sk_dst_check(sk, 0);
460
461 rcu_read_lock();
462 if (rt == NULL) {
463 const struct ip_options_rcu *inet_opt;
464
465 inet_opt = rcu_dereference(inet->inet_opt);
466
467 /* Use correct destination address if we have options. */
468 if (inet_opt && inet_opt->opt.srr)
469 daddr = inet_opt->opt.faddr;
470
471 /* If this fails, retransmit mechanism of transport layer will
472 * keep trying until route appears or the connection times
473 * itself out.
474 */
475 rt = ip_route_output_ports(sock_net(sk), fl4, sk,
476 daddr, inet->inet_saddr,
477 inet->inet_dport, inet->inet_sport,
478 sk->sk_protocol, RT_CONN_FLAGS(sk),
479 sk->sk_bound_dev_if);
480 if (IS_ERR(rt))
481 goto no_route;
482 if (connected) {
483 sk_setup_caps(sk, &rt->dst);
484 } else {
485 skb_dst_set(skb, &rt->dst);
486 goto xmit;
487 }
488 }
489
490 /* We dont need to clone dst here, it is guaranteed to not disappear.
491 * __dev_xmit_skb() might force a refcount if needed.
492 */
493 skb_dst_set_noref(skb, &rt->dst);
494
495 xmit:
496 /* Queue the packet to IP for output */
497 rc = ip_queue_xmit(sk, skb, &inet->cork.fl);
498 rcu_read_unlock();
499
500 error:
501 if (rc >= 0)
502 rc = len;
503
504 out:
505 release_sock(sk);
506 return rc;
507
508 no_route:
509 rcu_read_unlock();
510 IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES);
511 kfree_skb(skb);
512 rc = -EHOSTUNREACH;
513 goto out;
514 }
515
516 static int l2tp_ip_recvmsg(struct sock *sk, struct msghdr *msg,
517 size_t len, int noblock, int flags, int *addr_len)
518 {
519 struct inet_sock *inet = inet_sk(sk);
520 size_t copied = 0;
521 int err = -EOPNOTSUPP;
522 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
523 struct sk_buff *skb;
524
525 if (flags & MSG_OOB)
526 goto out;
527
528 skb = skb_recv_datagram(sk, flags, noblock, &err);
529 if (!skb)
530 goto out;
531
532 copied = skb->len;
533 if (len < copied) {
534 msg->msg_flags |= MSG_TRUNC;
535 copied = len;
536 }
537
538 err = skb_copy_datagram_msg(skb, 0, msg, copied);
539 if (err)
540 goto done;
541
542 sock_recv_timestamp(msg, sk, skb);
543
544 /* Copy the address. */
545 if (sin) {
546 sin->sin_family = AF_INET;
547 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
548 sin->sin_port = 0;
549 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
550 *addr_len = sizeof(*sin);
551 }
552 if (inet->cmsg_flags)
553 ip_cmsg_recv(msg, skb);
554 if (flags & MSG_TRUNC)
555 copied = skb->len;
556 done:
557 skb_free_datagram(sk, skb);
558 out:
559 return err ? err : copied;
560 }
561
562 int l2tp_ioctl(struct sock *sk, int cmd, unsigned long arg)
563 {
564 struct sk_buff *skb;
565 int amount;
566
567 switch (cmd) {
568 case SIOCOUTQ:
569 amount = sk_wmem_alloc_get(sk);
570 break;
571 case SIOCINQ:
572 spin_lock_bh(&sk->sk_receive_queue.lock);
573 skb = skb_peek(&sk->sk_receive_queue);
574 amount = skb ? skb->len : 0;
575 spin_unlock_bh(&sk->sk_receive_queue.lock);
576 break;
577
578 default:
579 return -ENOIOCTLCMD;
580 }
581
582 return put_user(amount, (int __user *)arg);
583 }
584 EXPORT_SYMBOL(l2tp_ioctl);
585
586 static struct proto l2tp_ip_prot = {
587 .name = "L2TP/IP",
588 .owner = THIS_MODULE,
589 .init = l2tp_ip_open,
590 .close = l2tp_ip_close,
591 .bind = l2tp_ip_bind,
592 .connect = l2tp_ip_connect,
593 .disconnect = l2tp_ip_disconnect,
594 .ioctl = l2tp_ioctl,
595 .destroy = l2tp_ip_destroy_sock,
596 .setsockopt = ip_setsockopt,
597 .getsockopt = ip_getsockopt,
598 .sendmsg = l2tp_ip_sendmsg,
599 .recvmsg = l2tp_ip_recvmsg,
600 .backlog_rcv = l2tp_ip_backlog_recv,
601 .hash = inet_hash,
602 .unhash = inet_unhash,
603 .obj_size = sizeof(struct l2tp_ip_sock),
604 #ifdef CONFIG_COMPAT
605 .compat_setsockopt = compat_ip_setsockopt,
606 .compat_getsockopt = compat_ip_getsockopt,
607 #endif
608 };
609
610 static const struct proto_ops l2tp_ip_ops = {
611 .family = PF_INET,
612 .owner = THIS_MODULE,
613 .release = inet_release,
614 .bind = inet_bind,
615 .connect = inet_dgram_connect,
616 .socketpair = sock_no_socketpair,
617 .accept = sock_no_accept,
618 .getname = l2tp_ip_getname,
619 .poll = datagram_poll,
620 .ioctl = inet_ioctl,
621 .listen = sock_no_listen,
622 .shutdown = inet_shutdown,
623 .setsockopt = sock_common_setsockopt,
624 .getsockopt = sock_common_getsockopt,
625 .sendmsg = inet_sendmsg,
626 .recvmsg = sock_common_recvmsg,
627 .mmap = sock_no_mmap,
628 .sendpage = sock_no_sendpage,
629 #ifdef CONFIG_COMPAT
630 .compat_setsockopt = compat_sock_common_setsockopt,
631 .compat_getsockopt = compat_sock_common_getsockopt,
632 #endif
633 };
634
635 static struct inet_protosw l2tp_ip_protosw = {
636 .type = SOCK_DGRAM,
637 .protocol = IPPROTO_L2TP,
638 .prot = &l2tp_ip_prot,
639 .ops = &l2tp_ip_ops,
640 };
641
642 static struct net_protocol l2tp_ip_protocol __read_mostly = {
643 .handler = l2tp_ip_recv,
644 .netns_ok = 1,
645 };
646
647 static int __init l2tp_ip_init(void)
648 {
649 int err;
650
651 pr_info("L2TP IP encapsulation support (L2TPv3)\n");
652
653 err = proto_register(&l2tp_ip_prot, 1);
654 if (err != 0)
655 goto out;
656
657 err = inet_add_protocol(&l2tp_ip_protocol, IPPROTO_L2TP);
658 if (err)
659 goto out1;
660
661 inet_register_protosw(&l2tp_ip_protosw);
662 return 0;
663
664 out1:
665 proto_unregister(&l2tp_ip_prot);
666 out:
667 return err;
668 }
669
670 static void __exit l2tp_ip_exit(void)
671 {
672 inet_unregister_protosw(&l2tp_ip_protosw);
673 inet_del_protocol(&l2tp_ip_protocol, IPPROTO_L2TP);
674 proto_unregister(&l2tp_ip_prot);
675 }
676
677 module_init(l2tp_ip_init);
678 module_exit(l2tp_ip_exit);
679
680 MODULE_LICENSE("GPL");
681 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
682 MODULE_DESCRIPTION("L2TP over IP");
683 MODULE_VERSION("1.0");
684
685 /* Use the value of SOCK_DGRAM (2) directory, because __stringify doesn't like
686 * enums
687 */
688 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 2, IPPROTO_L2TP);
689 MODULE_ALIAS_NET_PF_PROTO(PF_INET, IPPROTO_L2TP);
690
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