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TOMOYO Linux Cross Reference
Linux/net/l2tp/l2tp_ip.c

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  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 <linux/icmp.h>
 15 #include <linux/module.h>
 16 #include <linux/skbuff.h>
 17 #include <linux/random.h>
 18 #include <linux/socket.h>
 19 #include <linux/l2tp.h>
 20 #include <linux/in.h>
 21 #include <net/sock.h>
 22 #include <net/ip.h>
 23 #include <net/icmp.h>
 24 #include <net/udp.h>
 25 #include <net/inet_common.h>
 26 #include <net/inet_hashtables.h>
 27 #include <net/tcp_states.h>
 28 #include <net/protocol.h>
 29 #include <net/xfrm.h>
 30 
 31 #include "l2tp_core.h"
 32 
 33 struct l2tp_ip_sock {
 34         /* inet_sock has to be the first member of l2tp_ip_sock */
 35         struct inet_sock        inet;
 36 
 37         u32                     conn_id;
 38         u32                     peer_conn_id;
 39 };
 40 
 41 static DEFINE_RWLOCK(l2tp_ip_lock);
 42 static struct hlist_head l2tp_ip_table;
 43 static struct hlist_head l2tp_ip_bind_table;
 44 
 45 static inline struct l2tp_ip_sock *l2tp_ip_sk(const struct sock *sk)
 46 {
 47         return (struct l2tp_ip_sock *)sk;
 48 }
 49 
 50 static struct sock *__l2tp_ip_bind_lookup(struct net *net, __be32 laddr, int dif, u32 tunnel_id)
 51 {
 52         struct sock *sk;
 53 
 54         sk_for_each_bound(sk, &l2tp_ip_bind_table) {
 55                 struct inet_sock *inet = inet_sk(sk);
 56                 struct l2tp_ip_sock *l2tp = l2tp_ip_sk(sk);
 57 
 58                 if (l2tp == NULL)
 59                         continue;
 60 
 61                 if ((l2tp->conn_id == tunnel_id) &&
 62                     net_eq(sock_net(sk), net) &&
 63                     !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) &&
 64                     !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
 65                         goto found;
 66         }
 67 
 68         sk = NULL;
 69 found:
 70         return sk;
 71 }
 72 
 73 static inline struct sock *l2tp_ip_bind_lookup(struct net *net, __be32 laddr, int dif, u32 tunnel_id)
 74 {
 75         struct sock *sk = __l2tp_ip_bind_lookup(net, laddr, dif, tunnel_id);
 76         if (sk)
 77                 sock_hold(sk);
 78 
 79         return sk;
 80 }
 81 
 82 /* When processing receive frames, there are two cases to
 83  * consider. Data frames consist of a non-zero session-id and an
 84  * optional cookie. Control frames consist of a regular L2TP header
 85  * preceded by 32-bits of zeros.
 86  *
 87  * L2TPv3 Session Header Over IP
 88  *
 89  *  0                   1                   2                   3
 90  *  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
 91  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 92  * |                           Session ID                          |
 93  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 94  * |               Cookie (optional, maximum 64 bits)...
 95  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 96  *                                                                 |
 97  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 98  *
 99  * L2TPv3 Control Message Header Over IP
100  *
101  *  0                   1                   2                   3
102  *  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
103  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
104  * |                      (32 bits of zeros)                       |
105  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
106  * |T|L|x|x|S|x|x|x|x|x|x|x|  Ver  |             Length            |
107  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
108  * |                     Control Connection ID                     |
109  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
110  * |               Ns              |               Nr              |
111  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
112  *
113  * All control frames are passed to userspace.
114  */
115 static int l2tp_ip_recv(struct sk_buff *skb)
116 {
117         struct net *net = dev_net(skb->dev);
118         struct sock *sk;
119         u32 session_id;
120         u32 tunnel_id;
121         unsigned char *ptr, *optr;
122         struct l2tp_session *session;
123         struct l2tp_tunnel *tunnel = NULL;
124         int length;
125 
126         /* Point to L2TP header */
127         optr = ptr = skb->data;
128 
129         if (!pskb_may_pull(skb, 4))
130                 goto discard;
131 
132         session_id = ntohl(*((__be32 *) ptr));
133         ptr += 4;
134 
135         /* RFC3931: L2TP/IP packets have the first 4 bytes containing
136          * the session_id. If it is 0, the packet is a L2TP control
137          * frame and the session_id value can be discarded.
138          */
139         if (session_id == 0) {
140                 __skb_pull(skb, 4);
141                 goto pass_up;
142         }
143 
144         /* Ok, this is a data packet. Lookup the session. */
145         session = l2tp_session_find(net, NULL, session_id);
146         if (session == NULL)
147                 goto discard;
148 
149         tunnel = session->tunnel;
150         if (tunnel == NULL)
151                 goto discard;
152 
153         /* Trace packet contents, if enabled */
154         if (tunnel->debug & L2TP_MSG_DATA) {
155                 length = min(32u, skb->len);
156                 if (!pskb_may_pull(skb, length))
157                         goto discard;
158 
159                 pr_debug("%s: ip recv\n", tunnel->name);
160                 print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, ptr, length);
161         }
162 
163         l2tp_recv_common(session, skb, ptr, optr, 0, skb->len, tunnel->recv_payload_hook);
164 
165         return 0;
166 
167 pass_up:
168         /* Get the tunnel_id from the L2TP header */
169         if (!pskb_may_pull(skb, 12))
170                 goto discard;
171 
172         if ((skb->data[0] & 0xc0) != 0xc0)
173                 goto discard;
174 
175         tunnel_id = ntohl(*(__be32 *) &skb->data[4]);
176         tunnel = l2tp_tunnel_find(net, tunnel_id);
177         if (tunnel != NULL)
178                 sk = tunnel->sock;
179         else {
180                 struct iphdr *iph = (struct iphdr *) skb_network_header(skb);
181 
182                 read_lock_bh(&l2tp_ip_lock);
183                 sk = __l2tp_ip_bind_lookup(net, iph->daddr, 0, tunnel_id);
184                 read_unlock_bh(&l2tp_ip_lock);
185         }
186 
187         if (sk == NULL)
188                 goto discard;
189 
190         sock_hold(sk);
191 
192         if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
193                 goto discard_put;
194 
195         nf_reset(skb);
196 
197         return sk_receive_skb(sk, skb, 1);
198 
199 discard_put:
200         sock_put(sk);
201 
202 discard:
203         kfree_skb(skb);
204         return 0;
205 }
206 
207 static int l2tp_ip_open(struct sock *sk)
208 {
209         /* Prevent autobind. We don't have ports. */
210         inet_sk(sk)->inet_num = IPPROTO_L2TP;
211 
212         write_lock_bh(&l2tp_ip_lock);
213         sk_add_node(sk, &l2tp_ip_table);
214         write_unlock_bh(&l2tp_ip_lock);
215 
216         return 0;
217 }
218 
219 static void l2tp_ip_close(struct sock *sk, long timeout)
220 {
221         write_lock_bh(&l2tp_ip_lock);
222         hlist_del_init(&sk->sk_bind_node);
223         sk_del_node_init(sk);
224         write_unlock_bh(&l2tp_ip_lock);
225         sk_common_release(sk);
226 }
227 
228 static void l2tp_ip_destroy_sock(struct sock *sk)
229 {
230         struct sk_buff *skb;
231         struct l2tp_tunnel *tunnel = l2tp_sock_to_tunnel(sk);
232 
233         while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL)
234                 kfree_skb(skb);
235 
236         if (tunnel) {
237                 l2tp_tunnel_closeall(tunnel);
238                 sock_put(sk);
239         }
240 
241         sk_refcnt_debug_dec(sk);
242 }
243 
244 static int l2tp_ip_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
245 {
246         struct inet_sock *inet = inet_sk(sk);
247         struct sockaddr_l2tpip *addr = (struct sockaddr_l2tpip *) uaddr;
248         struct net *net = sock_net(sk);
249         int ret;
250         int chk_addr_ret;
251 
252         if (!sock_flag(sk, SOCK_ZAPPED))
253                 return -EINVAL;
254         if (addr_len < sizeof(struct sockaddr_l2tpip))
255                 return -EINVAL;
256         if (addr->l2tp_family != AF_INET)
257                 return -EINVAL;
258 
259         ret = -EADDRINUSE;
260         read_lock_bh(&l2tp_ip_lock);
261         if (__l2tp_ip_bind_lookup(net, addr->l2tp_addr.s_addr,
262                                   sk->sk_bound_dev_if, addr->l2tp_conn_id))
263                 goto out_in_use;
264 
265         read_unlock_bh(&l2tp_ip_lock);
266 
267         lock_sock(sk);
268         if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_l2tpip))
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         sk_dst_reset(sk);
282 
283         l2tp_ip_sk(sk)->conn_id = addr->l2tp_conn_id;
284 
285         write_lock_bh(&l2tp_ip_lock);
286         sk_add_bind_node(sk, &l2tp_ip_bind_table);
287         sk_del_node_init(sk);
288         write_unlock_bh(&l2tp_ip_lock);
289         ret = 0;
290         sock_reset_flag(sk, SOCK_ZAPPED);
291 
292 out:
293         release_sock(sk);
294 
295         return ret;
296 
297 out_in_use:
298         read_unlock_bh(&l2tp_ip_lock);
299 
300         return ret;
301 }
302 
303 static int l2tp_ip_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
304 {
305         struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *) uaddr;
306         int rc;
307 
308         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
309                 return -EINVAL;
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         rc = ip4_datagram_connect(sk, uaddr, addr_len);
318         if (rc < 0)
319                 return rc;
320 
321         lock_sock(sk);
322 
323         l2tp_ip_sk(sk)->peer_conn_id = lsa->l2tp_conn_id;
324 
325         write_lock_bh(&l2tp_ip_lock);
326         hlist_del_init(&sk->sk_bind_node);
327         sk_add_bind_node(sk, &l2tp_ip_bind_table);
328         write_unlock_bh(&l2tp_ip_lock);
329 
330         release_sock(sk);
331         return rc;
332 }
333 
334 static int l2tp_ip_disconnect(struct sock *sk, int flags)
335 {
336         if (sock_flag(sk, SOCK_ZAPPED))
337                 return 0;
338 
339         return udp_disconnect(sk, flags);
340 }
341 
342 static int l2tp_ip_getname(struct socket *sock, struct sockaddr *uaddr,
343                            int *uaddr_len, int peer)
344 {
345         struct sock *sk         = sock->sk;
346         struct inet_sock *inet  = inet_sk(sk);
347         struct l2tp_ip_sock *lsk = l2tp_ip_sk(sk);
348         struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *)uaddr;
349 
350         memset(lsa, 0, sizeof(*lsa));
351         lsa->l2tp_family = AF_INET;
352         if (peer) {
353                 if (!inet->inet_dport)
354                         return -ENOTCONN;
355                 lsa->l2tp_conn_id = lsk->peer_conn_id;
356                 lsa->l2tp_addr.s_addr = inet->inet_daddr;
357         } else {
358                 __be32 addr = inet->inet_rcv_saddr;
359                 if (!addr)
360                         addr = inet->inet_saddr;
361                 lsa->l2tp_conn_id = lsk->conn_id;
362                 lsa->l2tp_addr.s_addr = addr;
363         }
364         *uaddr_len = sizeof(*lsa);
365         return 0;
366 }
367 
368 static int l2tp_ip_backlog_recv(struct sock *sk, struct sk_buff *skb)
369 {
370         int rc;
371 
372         /* Charge it to the socket, dropping if the queue is full. */
373         rc = sock_queue_rcv_skb(sk, skb);
374         if (rc < 0)
375                 goto drop;
376 
377         return 0;
378 
379 drop:
380         IP_INC_STATS(sock_net(sk), IPSTATS_MIB_INDISCARDS);
381         kfree_skb(skb);
382         return -1;
383 }
384 
385 /* Userspace will call sendmsg() on the tunnel socket to send L2TP
386  * control frames.
387  */
388 static int l2tp_ip_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
389 {
390         struct sk_buff *skb;
391         int rc;
392         struct inet_sock *inet = inet_sk(sk);
393         struct rtable *rt = NULL;
394         struct flowi4 *fl4;
395         int connected = 0;
396         __be32 daddr;
397 
398         lock_sock(sk);
399 
400         rc = -ENOTCONN;
401         if (sock_flag(sk, SOCK_DEAD))
402                 goto out;
403 
404         /* Get and verify the address. */
405         if (msg->msg_name) {
406                 DECLARE_SOCKADDR(struct sockaddr_l2tpip *, lip, msg->msg_name);
407                 rc = -EINVAL;
408                 if (msg->msg_namelen < sizeof(*lip))
409                         goto out;
410 
411                 if (lip->l2tp_family != AF_INET) {
412                         rc = -EAFNOSUPPORT;
413                         if (lip->l2tp_family != AF_UNSPEC)
414                                 goto out;
415                 }
416 
417                 daddr = lip->l2tp_addr.s_addr;
418         } else {
419                 rc = -EDESTADDRREQ;
420                 if (sk->sk_state != TCP_ESTABLISHED)
421                         goto out;
422 
423                 daddr = inet->inet_daddr;
424                 connected = 1;
425         }
426 
427         /* Allocate a socket buffer */
428         rc = -ENOMEM;
429         skb = sock_wmalloc(sk, 2 + NET_SKB_PAD + sizeof(struct iphdr) +
430                            4 + len, 0, GFP_KERNEL);
431         if (!skb)
432                 goto error;
433 
434         /* Reserve space for headers, putting IP header on 4-byte boundary. */
435         skb_reserve(skb, 2 + NET_SKB_PAD);
436         skb_reset_network_header(skb);
437         skb_reserve(skb, sizeof(struct iphdr));
438         skb_reset_transport_header(skb);
439 
440         /* Insert 0 session_id */
441         *((__be32 *) skb_put(skb, 4)) = 0;
442 
443         /* Copy user data into skb */
444         rc = memcpy_from_msg(skb_put(skb, len), msg, len);
445         if (rc < 0) {
446                 kfree_skb(skb);
447                 goto error;
448         }
449 
450         fl4 = &inet->cork.fl.u.ip4;
451         if (connected)
452                 rt = (struct rtable *) __sk_dst_check(sk, 0);
453 
454         rcu_read_lock();
455         if (rt == NULL) {
456                 const struct ip_options_rcu *inet_opt;
457 
458                 inet_opt = rcu_dereference(inet->inet_opt);
459 
460                 /* Use correct destination address if we have options. */
461                 if (inet_opt && inet_opt->opt.srr)
462                         daddr = inet_opt->opt.faddr;
463 
464                 /* If this fails, retransmit mechanism of transport layer will
465                  * keep trying until route appears or the connection times
466                  * itself out.
467                  */
468                 rt = ip_route_output_ports(sock_net(sk), fl4, sk,
469                                            daddr, inet->inet_saddr,
470                                            inet->inet_dport, inet->inet_sport,
471                                            sk->sk_protocol, RT_CONN_FLAGS(sk),
472                                            sk->sk_bound_dev_if);
473                 if (IS_ERR(rt))
474                         goto no_route;
475                 if (connected) {
476                         sk_setup_caps(sk, &rt->dst);
477                 } else {
478                         skb_dst_set(skb, &rt->dst);
479                         goto xmit;
480                 }
481         }
482 
483         /* We dont need to clone dst here, it is guaranteed to not disappear.
484          *  __dev_xmit_skb() might force a refcount if needed.
485          */
486         skb_dst_set_noref(skb, &rt->dst);
487 
488 xmit:
489         /* Queue the packet to IP for output */
490         rc = ip_queue_xmit(sk, skb, &inet->cork.fl);
491         rcu_read_unlock();
492 
493 error:
494         if (rc >= 0)
495                 rc = len;
496 
497 out:
498         release_sock(sk);
499         return rc;
500 
501 no_route:
502         rcu_read_unlock();
503         IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES);
504         kfree_skb(skb);
505         rc = -EHOSTUNREACH;
506         goto out;
507 }
508 
509 static int l2tp_ip_recvmsg(struct sock *sk, struct msghdr *msg,
510                            size_t len, int noblock, int flags, int *addr_len)
511 {
512         struct inet_sock *inet = inet_sk(sk);
513         size_t copied = 0;
514         int err = -EOPNOTSUPP;
515         DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
516         struct sk_buff *skb;
517 
518         if (flags & MSG_OOB)
519                 goto out;
520 
521         skb = skb_recv_datagram(sk, flags, noblock, &err);
522         if (!skb)
523                 goto out;
524 
525         copied = skb->len;
526         if (len < copied) {
527                 msg->msg_flags |= MSG_TRUNC;
528                 copied = len;
529         }
530 
531         err = skb_copy_datagram_msg(skb, 0, msg, copied);
532         if (err)
533                 goto done;
534 
535         sock_recv_timestamp(msg, sk, skb);
536 
537         /* Copy the address. */
538         if (sin) {
539                 sin->sin_family = AF_INET;
540                 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
541                 sin->sin_port = 0;
542                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
543                 *addr_len = sizeof(*sin);
544         }
545         if (inet->cmsg_flags)
546                 ip_cmsg_recv(msg, skb);
547         if (flags & MSG_TRUNC)
548                 copied = skb->len;
549 done:
550         skb_free_datagram(sk, skb);
551 out:
552         return err ? err : copied;
553 }
554 
555 static struct proto l2tp_ip_prot = {
556         .name              = "L2TP/IP",
557         .owner             = THIS_MODULE,
558         .init              = l2tp_ip_open,
559         .close             = l2tp_ip_close,
560         .bind              = l2tp_ip_bind,
561         .connect           = l2tp_ip_connect,
562         .disconnect        = l2tp_ip_disconnect,
563         .ioctl             = udp_ioctl,
564         .destroy           = l2tp_ip_destroy_sock,
565         .setsockopt        = ip_setsockopt,
566         .getsockopt        = ip_getsockopt,
567         .sendmsg           = l2tp_ip_sendmsg,
568         .recvmsg           = l2tp_ip_recvmsg,
569         .backlog_rcv       = l2tp_ip_backlog_recv,
570         .hash              = inet_hash,
571         .unhash            = inet_unhash,
572         .obj_size          = sizeof(struct l2tp_ip_sock),
573 #ifdef CONFIG_COMPAT
574         .compat_setsockopt = compat_ip_setsockopt,
575         .compat_getsockopt = compat_ip_getsockopt,
576 #endif
577 };
578 
579 static const struct proto_ops l2tp_ip_ops = {
580         .family            = PF_INET,
581         .owner             = THIS_MODULE,
582         .release           = inet_release,
583         .bind              = inet_bind,
584         .connect           = inet_dgram_connect,
585         .socketpair        = sock_no_socketpair,
586         .accept            = sock_no_accept,
587         .getname           = l2tp_ip_getname,
588         .poll              = datagram_poll,
589         .ioctl             = inet_ioctl,
590         .listen            = sock_no_listen,
591         .shutdown          = inet_shutdown,
592         .setsockopt        = sock_common_setsockopt,
593         .getsockopt        = sock_common_getsockopt,
594         .sendmsg           = inet_sendmsg,
595         .recvmsg           = sock_common_recvmsg,
596         .mmap              = sock_no_mmap,
597         .sendpage          = sock_no_sendpage,
598 #ifdef CONFIG_COMPAT
599         .compat_setsockopt = compat_sock_common_setsockopt,
600         .compat_getsockopt = compat_sock_common_getsockopt,
601 #endif
602 };
603 
604 static struct inet_protosw l2tp_ip_protosw = {
605         .type           = SOCK_DGRAM,
606         .protocol       = IPPROTO_L2TP,
607         .prot           = &l2tp_ip_prot,
608         .ops            = &l2tp_ip_ops,
609 };
610 
611 static struct net_protocol l2tp_ip_protocol __read_mostly = {
612         .handler        = l2tp_ip_recv,
613         .netns_ok       = 1,
614 };
615 
616 static int __init l2tp_ip_init(void)
617 {
618         int err;
619 
620         pr_info("L2TP IP encapsulation support (L2TPv3)\n");
621 
622         err = proto_register(&l2tp_ip_prot, 1);
623         if (err != 0)
624                 goto out;
625 
626         err = inet_add_protocol(&l2tp_ip_protocol, IPPROTO_L2TP);
627         if (err)
628                 goto out1;
629 
630         inet_register_protosw(&l2tp_ip_protosw);
631         return 0;
632 
633 out1:
634         proto_unregister(&l2tp_ip_prot);
635 out:
636         return err;
637 }
638 
639 static void __exit l2tp_ip_exit(void)
640 {
641         inet_unregister_protosw(&l2tp_ip_protosw);
642         inet_del_protocol(&l2tp_ip_protocol, IPPROTO_L2TP);
643         proto_unregister(&l2tp_ip_prot);
644 }
645 
646 module_init(l2tp_ip_init);
647 module_exit(l2tp_ip_exit);
648 
649 MODULE_LICENSE("GPL");
650 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
651 MODULE_DESCRIPTION("L2TP over IP");
652 MODULE_VERSION("1.0");
653 
654 /* Use the value of SOCK_DGRAM (2) directory, because __stringify doesn't like
655  * enums
656  */
657 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 2, IPPROTO_L2TP);
658 

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