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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 <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, NULL, 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         l2tp_recv_common(session, skb, ptr, optr, 0, skb->len, tunnel->recv_payload_hook);
169         l2tp_session_dec_refcount(session);
170 
171         return 0;
172 
173 pass_up:
174         /* Get the tunnel_id from the L2TP header */
175         if (!pskb_may_pull(skb, 12))
176                 goto discard;
177 
178         if ((skb->data[0] & 0xc0) != 0xc0)
179                 goto discard;
180 
181         tunnel_id = ntohl(*(__be32 *) &skb->data[4]);
182         iph = (struct iphdr *)skb_network_header(skb);
183 
184         read_lock_bh(&l2tp_ip_lock);
185         sk = __l2tp_ip_bind_lookup(net, iph->daddr, iph->saddr, inet_iif(skb),
186                                    tunnel_id);
187         if (!sk) {
188                 read_unlock_bh(&l2tp_ip_lock);
189                 goto discard;
190         }
191         sock_hold(sk);
192         read_unlock_bh(&l2tp_ip_lock);
193 
194         if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
195                 goto discard_put;
196 
197         nf_reset(skb);
198 
199         return sk_receive_skb(sk, skb, 1);
200 
201 discard_sess:
202         l2tp_session_dec_refcount(session);
203         goto discard;
204 
205 discard_put:
206         sock_put(sk);
207 
208 discard:
209         kfree_skb(skb);
210         return 0;
211 }
212 
213 static int l2tp_ip_open(struct sock *sk)
214 {
215         /* Prevent autobind. We don't have ports. */
216         inet_sk(sk)->inet_num = IPPROTO_L2TP;
217 
218         write_lock_bh(&l2tp_ip_lock);
219         sk_add_node(sk, &l2tp_ip_table);
220         write_unlock_bh(&l2tp_ip_lock);
221 
222         return 0;
223 }
224 
225 static void l2tp_ip_close(struct sock *sk, long timeout)
226 {
227         write_lock_bh(&l2tp_ip_lock);
228         hlist_del_init(&sk->sk_bind_node);
229         sk_del_node_init(sk);
230         write_unlock_bh(&l2tp_ip_lock);
231         sk_common_release(sk);
232 }
233 
234 static void l2tp_ip_destroy_sock(struct sock *sk)
235 {
236         struct sk_buff *skb;
237         struct l2tp_tunnel *tunnel = sk->sk_user_data;
238 
239         while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL)
240                 kfree_skb(skb);
241 
242         if (tunnel)
243                 l2tp_tunnel_delete(tunnel);
244 }
245 
246 static int l2tp_ip_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
247 {
248         struct inet_sock *inet = inet_sk(sk);
249         struct sockaddr_l2tpip *addr = (struct sockaddr_l2tpip *) uaddr;
250         struct net *net = sock_net(sk);
251         int ret;
252         int chk_addr_ret;
253 
254         if (addr_len < sizeof(struct sockaddr_l2tpip))
255                 return -EINVAL;
256         if (addr->l2tp_family != AF_INET)
257                 return -EINVAL;
258 
259         lock_sock(sk);
260 
261         ret = -EINVAL;
262         if (!sock_flag(sk, SOCK_ZAPPED))
263                 goto out;
264 
265         if (sk->sk_state != TCP_CLOSE)
266                 goto out;
267 
268         chk_addr_ret = inet_addr_type(net, addr->l2tp_addr.s_addr);
269         ret = -EADDRNOTAVAIL;
270         if (addr->l2tp_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
271             chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
272                 goto out;
273 
274         if (addr->l2tp_addr.s_addr)
275                 inet->inet_rcv_saddr = inet->inet_saddr = addr->l2tp_addr.s_addr;
276         if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
277                 inet->inet_saddr = 0;  /* Use device */
278 
279         write_lock_bh(&l2tp_ip_lock);
280         if (__l2tp_ip_bind_lookup(net, addr->l2tp_addr.s_addr, 0,
281                                   sk->sk_bound_dev_if, addr->l2tp_conn_id)) {
282                 write_unlock_bh(&l2tp_ip_lock);
283                 ret = -EADDRINUSE;
284                 goto out;
285         }
286 
287         sk_dst_reset(sk);
288         l2tp_ip_sk(sk)->conn_id = addr->l2tp_conn_id;
289 
290         sk_add_bind_node(sk, &l2tp_ip_bind_table);
291         sk_del_node_init(sk);
292         write_unlock_bh(&l2tp_ip_lock);
293 
294         ret = 0;
295         sock_reset_flag(sk, SOCK_ZAPPED);
296 
297 out:
298         release_sock(sk);
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 (addr_len < sizeof(*lsa))
309                 return -EINVAL;
310 
311         if (ipv4_is_multicast(lsa->l2tp_addr.s_addr))
312                 return -EINVAL;
313 
314         lock_sock(sk);
315 
316         /* Must bind first - autobinding does not work */
317         if (sock_flag(sk, SOCK_ZAPPED)) {
318                 rc = -EINVAL;
319                 goto out_sk;
320         }
321 
322         rc = __ip4_datagram_connect(sk, uaddr, addr_len);
323         if (rc < 0)
324                 goto out_sk;
325 
326         l2tp_ip_sk(sk)->peer_conn_id = lsa->l2tp_conn_id;
327 
328         write_lock_bh(&l2tp_ip_lock);
329         hlist_del_init(&sk->sk_bind_node);
330         sk_add_bind_node(sk, &l2tp_ip_bind_table);
331         write_unlock_bh(&l2tp_ip_lock);
332 
333 out_sk:
334         release_sock(sk);
335 
336         return rc;
337 }
338 
339 static int l2tp_ip_disconnect(struct sock *sk, int flags)
340 {
341         if (sock_flag(sk, SOCK_ZAPPED))
342                 return 0;
343 
344         return __udp_disconnect(sk, flags);
345 }
346 
347 static int l2tp_ip_getname(struct socket *sock, struct sockaddr *uaddr,
348                            int peer)
349 {
350         struct sock *sk         = sock->sk;
351         struct inet_sock *inet  = inet_sk(sk);
352         struct l2tp_ip_sock *lsk = l2tp_ip_sk(sk);
353         struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *)uaddr;
354 
355         memset(lsa, 0, sizeof(*lsa));
356         lsa->l2tp_family = AF_INET;
357         if (peer) {
358                 if (!inet->inet_dport)
359                         return -ENOTCONN;
360                 lsa->l2tp_conn_id = lsk->peer_conn_id;
361                 lsa->l2tp_addr.s_addr = inet->inet_daddr;
362         } else {
363                 __be32 addr = inet->inet_rcv_saddr;
364                 if (!addr)
365                         addr = inet->inet_saddr;
366                 lsa->l2tp_conn_id = lsk->conn_id;
367                 lsa->l2tp_addr.s_addr = addr;
368         }
369         return sizeof(*lsa);
370 }
371 
372 static int l2tp_ip_backlog_recv(struct sock *sk, struct sk_buff *skb)
373 {
374         int rc;
375 
376         /* Charge it to the socket, dropping if the queue is full. */
377         rc = sock_queue_rcv_skb(sk, skb);
378         if (rc < 0)
379                 goto drop;
380 
381         return 0;
382 
383 drop:
384         IP_INC_STATS(sock_net(sk), IPSTATS_MIB_INDISCARDS);
385         kfree_skb(skb);
386         return 0;
387 }
388 
389 /* Userspace will call sendmsg() on the tunnel socket to send L2TP
390  * control frames.
391  */
392 static int l2tp_ip_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
393 {
394         struct sk_buff *skb;
395         int rc;
396         struct inet_sock *inet = inet_sk(sk);
397         struct rtable *rt = NULL;
398         struct flowi4 *fl4;
399         int connected = 0;
400         __be32 daddr;
401 
402         lock_sock(sk);
403 
404         rc = -ENOTCONN;
405         if (sock_flag(sk, SOCK_DEAD))
406                 goto out;
407 
408         /* Get and verify the address. */
409         if (msg->msg_name) {
410                 DECLARE_SOCKADDR(struct sockaddr_l2tpip *, lip, msg->msg_name);
411                 rc = -EINVAL;
412                 if (msg->msg_namelen < sizeof(*lip))
413                         goto out;
414 
415                 if (lip->l2tp_family != AF_INET) {
416                         rc = -EAFNOSUPPORT;
417                         if (lip->l2tp_family != AF_UNSPEC)
418                                 goto out;
419                 }
420 
421                 daddr = lip->l2tp_addr.s_addr;
422         } else {
423                 rc = -EDESTADDRREQ;
424                 if (sk->sk_state != TCP_ESTABLISHED)
425                         goto out;
426 
427                 daddr = inet->inet_daddr;
428                 connected = 1;
429         }
430 
431         /* Allocate a socket buffer */
432         rc = -ENOMEM;
433         skb = sock_wmalloc(sk, 2 + NET_SKB_PAD + sizeof(struct iphdr) +
434                            4 + len, 0, GFP_KERNEL);
435         if (!skb)
436                 goto error;
437 
438         /* Reserve space for headers, putting IP header on 4-byte boundary. */
439         skb_reserve(skb, 2 + NET_SKB_PAD);
440         skb_reset_network_header(skb);
441         skb_reserve(skb, sizeof(struct iphdr));
442         skb_reset_transport_header(skb);
443 
444         /* Insert 0 session_id */
445         *((__be32 *) skb_put(skb, 4)) = 0;
446 
447         /* Copy user data into skb */
448         rc = memcpy_from_msg(skb_put(skb, len), msg, len);
449         if (rc < 0) {
450                 kfree_skb(skb);
451                 goto error;
452         }
453 
454         fl4 = &inet->cork.fl.u.ip4;
455         if (connected)
456                 rt = (struct rtable *) __sk_dst_check(sk, 0);
457 
458         rcu_read_lock();
459         if (rt == NULL) {
460                 const struct ip_options_rcu *inet_opt;
461 
462                 inet_opt = rcu_dereference(inet->inet_opt);
463 
464                 /* Use correct destination address if we have options. */
465                 if (inet_opt && inet_opt->opt.srr)
466                         daddr = inet_opt->opt.faddr;
467 
468                 /* If this fails, retransmit mechanism of transport layer will
469                  * keep trying until route appears or the connection times
470                  * itself out.
471                  */
472                 rt = ip_route_output_ports(sock_net(sk), fl4, sk,
473                                            daddr, inet->inet_saddr,
474                                            inet->inet_dport, inet->inet_sport,
475                                            sk->sk_protocol, RT_CONN_FLAGS(sk),
476                                            sk->sk_bound_dev_if);
477                 if (IS_ERR(rt))
478                         goto no_route;
479                 if (connected) {
480                         sk_setup_caps(sk, &rt->dst);
481                 } else {
482                         skb_dst_set(skb, &rt->dst);
483                         goto xmit;
484                 }
485         }
486 
487         /* We dont need to clone dst here, it is guaranteed to not disappear.
488          *  __dev_xmit_skb() might force a refcount if needed.
489          */
490         skb_dst_set_noref(skb, &rt->dst);
491 
492 xmit:
493         /* Queue the packet to IP for output */
494         rc = ip_queue_xmit(sk, skb, &inet->cork.fl);
495         rcu_read_unlock();
496 
497 error:
498         if (rc >= 0)
499                 rc = len;
500 
501 out:
502         release_sock(sk);
503         return rc;
504 
505 no_route:
506         rcu_read_unlock();
507         IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES);
508         kfree_skb(skb);
509         rc = -EHOSTUNREACH;
510         goto out;
511 }
512 
513 static int l2tp_ip_recvmsg(struct sock *sk, struct msghdr *msg,
514                            size_t len, int noblock, int flags, int *addr_len)
515 {
516         struct inet_sock *inet = inet_sk(sk);
517         size_t copied = 0;
518         int err = -EOPNOTSUPP;
519         DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
520         struct sk_buff *skb;
521 
522         if (flags & MSG_OOB)
523                 goto out;
524 
525         skb = skb_recv_datagram(sk, flags, noblock, &err);
526         if (!skb)
527                 goto out;
528 
529         copied = skb->len;
530         if (len < copied) {
531                 msg->msg_flags |= MSG_TRUNC;
532                 copied = len;
533         }
534 
535         err = skb_copy_datagram_msg(skb, 0, msg, copied);
536         if (err)
537                 goto done;
538 
539         sock_recv_timestamp(msg, sk, skb);
540 
541         /* Copy the address. */
542         if (sin) {
543                 sin->sin_family = AF_INET;
544                 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
545                 sin->sin_port = 0;
546                 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
547                 *addr_len = sizeof(*sin);
548         }
549         if (inet->cmsg_flags)
550                 ip_cmsg_recv(msg, skb);
551         if (flags & MSG_TRUNC)
552                 copied = skb->len;
553 done:
554         skb_free_datagram(sk, skb);
555 out:
556         return err ? err : copied;
557 }
558 
559 int l2tp_ioctl(struct sock *sk, int cmd, unsigned long arg)
560 {
561         struct sk_buff *skb;
562         int amount;
563 
564         switch (cmd) {
565         case SIOCOUTQ:
566                 amount = sk_wmem_alloc_get(sk);
567                 break;
568         case SIOCINQ:
569                 spin_lock_bh(&sk->sk_receive_queue.lock);
570                 skb = skb_peek(&sk->sk_receive_queue);
571                 amount = skb ? skb->len : 0;
572                 spin_unlock_bh(&sk->sk_receive_queue.lock);
573                 break;
574 
575         default:
576                 return -ENOIOCTLCMD;
577         }
578 
579         return put_user(amount, (int __user *)arg);
580 }
581 EXPORT_SYMBOL(l2tp_ioctl);
582 
583 static struct proto l2tp_ip_prot = {
584         .name              = "L2TP/IP",
585         .owner             = THIS_MODULE,
586         .init              = l2tp_ip_open,
587         .close             = l2tp_ip_close,
588         .bind              = l2tp_ip_bind,
589         .connect           = l2tp_ip_connect,
590         .disconnect        = l2tp_ip_disconnect,
591         .ioctl             = l2tp_ioctl,
592         .destroy           = l2tp_ip_destroy_sock,
593         .setsockopt        = ip_setsockopt,
594         .getsockopt        = ip_getsockopt,
595         .sendmsg           = l2tp_ip_sendmsg,
596         .recvmsg           = l2tp_ip_recvmsg,
597         .backlog_rcv       = l2tp_ip_backlog_recv,
598         .hash              = inet_hash,
599         .unhash            = inet_unhash,
600         .obj_size          = sizeof(struct l2tp_ip_sock),
601 #ifdef CONFIG_COMPAT
602         .compat_setsockopt = compat_ip_setsockopt,
603         .compat_getsockopt = compat_ip_getsockopt,
604 #endif
605 };
606 
607 static const struct proto_ops l2tp_ip_ops = {
608         .family            = PF_INET,
609         .owner             = THIS_MODULE,
610         .release           = inet_release,
611         .bind              = inet_bind,
612         .connect           = inet_dgram_connect,
613         .socketpair        = sock_no_socketpair,
614         .accept            = sock_no_accept,
615         .getname           = l2tp_ip_getname,
616         .poll              = datagram_poll,
617         .ioctl             = inet_ioctl,
618         .listen            = sock_no_listen,
619         .shutdown          = inet_shutdown,
620         .setsockopt        = sock_common_setsockopt,
621         .getsockopt        = sock_common_getsockopt,
622         .sendmsg           = inet_sendmsg,
623         .recvmsg           = sock_common_recvmsg,
624         .mmap              = sock_no_mmap,
625         .sendpage          = sock_no_sendpage,
626 #ifdef CONFIG_COMPAT
627         .compat_setsockopt = compat_sock_common_setsockopt,
628         .compat_getsockopt = compat_sock_common_getsockopt,
629 #endif
630 };
631 
632 static struct inet_protosw l2tp_ip_protosw = {
633         .type           = SOCK_DGRAM,
634         .protocol       = IPPROTO_L2TP,
635         .prot           = &l2tp_ip_prot,
636         .ops            = &l2tp_ip_ops,
637 };
638 
639 static struct net_protocol l2tp_ip_protocol __read_mostly = {
640         .handler        = l2tp_ip_recv,
641         .netns_ok       = 1,
642 };
643 
644 static int __init l2tp_ip_init(void)
645 {
646         int err;
647 
648         pr_info("L2TP IP encapsulation support (L2TPv3)\n");
649 
650         err = proto_register(&l2tp_ip_prot, 1);
651         if (err != 0)
652                 goto out;
653 
654         err = inet_add_protocol(&l2tp_ip_protocol, IPPROTO_L2TP);
655         if (err)
656                 goto out1;
657 
658         inet_register_protosw(&l2tp_ip_protosw);
659         return 0;
660 
661 out1:
662         proto_unregister(&l2tp_ip_prot);
663 out:
664         return err;
665 }
666 
667 static void __exit l2tp_ip_exit(void)
668 {
669         inet_unregister_protosw(&l2tp_ip_protosw);
670         inet_del_protocol(&l2tp_ip_protocol, IPPROTO_L2TP);
671         proto_unregister(&l2tp_ip_prot);
672 }
673 
674 module_init(l2tp_ip_init);
675 module_exit(l2tp_ip_exit);
676 
677 MODULE_LICENSE("GPL");
678 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
679 MODULE_DESCRIPTION("L2TP over IP");
680 MODULE_VERSION("1.0");
681 
682 /* Use the value of SOCK_DGRAM (2) directory, because __stringify doesn't like
683  * enums
684  */
685 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 2, IPPROTO_L2TP);
686 MODULE_ALIAS_NET_PF_PROTO(PF_INET, IPPROTO_L2TP);
687 

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