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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 <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(struct net *net, __be32 laddr, int dif, u32 tunnel_id)
 52 {
 53         struct sock *sk;
 54 
 55         sk_for_each_bound(sk, &l2tp_ip_bind_table) {
 56                 struct inet_sock *inet = inet_sk(sk);
 57                 struct l2tp_ip_sock *l2tp = l2tp_ip_sk(sk);
 58 
 59                 if (l2tp == NULL)
 60                         continue;
 61 
 62                 if ((l2tp->conn_id == tunnel_id) &&
 63                     net_eq(sock_net(sk), net) &&
 64                     !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) &&
 65                     !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
 66                         goto found;
 67         }
 68 
 69         sk = NULL;
 70 found:
 71         return sk;
 72 }
 73 
 74 static inline struct sock *l2tp_ip_bind_lookup(struct net *net, __be32 laddr, int dif, u32 tunnel_id)
 75 {
 76         struct sock *sk = __l2tp_ip_bind_lookup(net, laddr, dif, tunnel_id);
 77         if (sk)
 78                 sock_hold(sk);
 79 
 80         return sk;
 81 }
 82 
 83 /* When processing receive frames, there are two cases to
 84  * consider. Data frames consist of a non-zero session-id and an
 85  * optional cookie. Control frames consist of a regular L2TP header
 86  * preceded by 32-bits of zeros.
 87  *
 88  * L2TPv3 Session Header Over IP
 89  *
 90  *  0                   1                   2                   3
 91  *  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
 92  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 93  * |                           Session ID                          |
 94  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 95  * |               Cookie (optional, maximum 64 bits)...
 96  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 97  *                                                                 |
 98  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 99  *
100  * L2TPv3 Control Message Header Over IP
101  *
102  *  0                   1                   2                   3
103  *  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
104  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
105  * |                      (32 bits of zeros)                       |
106  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
107  * |T|L|x|x|S|x|x|x|x|x|x|x|  Ver  |             Length            |
108  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
109  * |                     Control Connection ID                     |
110  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
111  * |               Ns              |               Nr              |
112  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
113  *
114  * All control frames are passed to userspace.
115  */
116 static int l2tp_ip_recv(struct sk_buff *skb)
117 {
118         struct net *net = dev_net(skb->dev);
119         struct sock *sk;
120         u32 session_id;
121         u32 tunnel_id;
122         unsigned char *ptr, *optr;
123         struct l2tp_session *session;
124         struct l2tp_tunnel *tunnel = NULL;
125         int length;
126 
127         if (!pskb_may_pull(skb, 4))
128                 goto discard;
129 
130         /* Point to L2TP header */
131         optr = ptr = skb->data;
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                 /* Point to L2TP header */
160                 optr = ptr = skb->data;
161                 ptr += 4;
162                 pr_debug("%s: ip recv\n", tunnel->name);
163                 print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, ptr, length);
164         }
165 
166         if (l2tp_v3_ensure_opt_in_linear(session, skb, &ptr, &optr))
167                 goto discard;
168 
169         l2tp_recv_common(session, skb, ptr, optr, 0, skb->len, tunnel->recv_payload_hook);
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         tunnel = l2tp_tunnel_find(net, tunnel_id);
183         if (tunnel != NULL)
184                 sk = tunnel->sock;
185         else {
186                 struct iphdr *iph = (struct iphdr *) skb_network_header(skb);
187 
188                 read_lock_bh(&l2tp_ip_lock);
189                 sk = __l2tp_ip_bind_lookup(net, iph->daddr, 0, tunnel_id);
190                 read_unlock_bh(&l2tp_ip_lock);
191         }
192 
193         if (sk == NULL)
194                 goto discard;
195 
196         sock_hold(sk);
197 
198         if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
199                 goto discard_put;
200 
201         nf_reset(skb);
202 
203         return sk_receive_skb(sk, skb, 1);
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 = l2tp_sock_to_tunnel(sk);
238 
239         while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL)
240                 kfree_skb(skb);
241 
242         if (tunnel) {
243                 l2tp_tunnel_closeall(tunnel);
244                 sock_put(sk);
245         }
246 
247         sk_refcnt_debug_dec(sk);
248 }
249 
250 static int l2tp_ip_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
251 {
252         struct inet_sock *inet = inet_sk(sk);
253         struct sockaddr_l2tpip *addr = (struct sockaddr_l2tpip *) uaddr;
254         struct net *net = sock_net(sk);
255         int ret;
256         int chk_addr_ret;
257 
258         if (addr_len < sizeof(struct sockaddr_l2tpip))
259                 return -EINVAL;
260         if (addr->l2tp_family != AF_INET)
261                 return -EINVAL;
262 
263         ret = -EADDRINUSE;
264         read_lock_bh(&l2tp_ip_lock);
265         if (__l2tp_ip_bind_lookup(net, addr->l2tp_addr.s_addr,
266                                   sk->sk_bound_dev_if, addr->l2tp_conn_id))
267                 goto out_in_use;
268 
269         read_unlock_bh(&l2tp_ip_lock);
270 
271         lock_sock(sk);
272         if (!sock_flag(sk, SOCK_ZAPPED))
273                 goto out;
274 
275         if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_l2tpip))
276                 goto out;
277 
278         chk_addr_ret = inet_addr_type(net, addr->l2tp_addr.s_addr);
279         ret = -EADDRNOTAVAIL;
280         if (addr->l2tp_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
281             chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
282                 goto out;
283 
284         if (addr->l2tp_addr.s_addr)
285                 inet->inet_rcv_saddr = inet->inet_saddr = addr->l2tp_addr.s_addr;
286         if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
287                 inet->inet_saddr = 0;  /* Use device */
288         sk_dst_reset(sk);
289 
290         l2tp_ip_sk(sk)->conn_id = addr->l2tp_conn_id;
291 
292         write_lock_bh(&l2tp_ip_lock);
293         sk_add_bind_node(sk, &l2tp_ip_bind_table);
294         sk_del_node_init(sk);
295         write_unlock_bh(&l2tp_ip_lock);
296         ret = 0;
297         sock_reset_flag(sk, SOCK_ZAPPED);
298 
299 out:
300         release_sock(sk);
301 
302         return ret;
303 
304 out_in_use:
305         read_unlock_bh(&l2tp_ip_lock);
306 
307         return ret;
308 }
309 
310 static int l2tp_ip_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
311 {
312         struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *) uaddr;
313         int rc;
314 
315         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
316                 return -EINVAL;
317 
318         if (addr_len < sizeof(*lsa))
319                 return -EINVAL;
320 
321         if (ipv4_is_multicast(lsa->l2tp_addr.s_addr))
322                 return -EINVAL;
323 
324         rc = ip4_datagram_connect(sk, uaddr, addr_len);
325         if (rc < 0)
326                 return rc;
327 
328         lock_sock(sk);
329 
330         l2tp_ip_sk(sk)->peer_conn_id = lsa->l2tp_conn_id;
331 
332         write_lock_bh(&l2tp_ip_lock);
333         hlist_del_init(&sk->sk_bind_node);
334         sk_add_bind_node(sk, &l2tp_ip_bind_table);
335         write_unlock_bh(&l2tp_ip_lock);
336 
337         release_sock(sk);
338         return rc;
339 }
340 
341 static int l2tp_ip_disconnect(struct sock *sk, int flags)
342 {
343         if (sock_flag(sk, SOCK_ZAPPED))
344                 return 0;
345 
346         return udp_disconnect(sk, flags);
347 }
348 
349 static int l2tp_ip_getname(struct socket *sock, struct sockaddr *uaddr,
350                            int *uaddr_len, int peer)
351 {
352         struct sock *sk         = sock->sk;
353         struct inet_sock *inet  = inet_sk(sk);
354         struct l2tp_ip_sock *lsk = l2tp_ip_sk(sk);
355         struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *)uaddr;
356 
357         memset(lsa, 0, sizeof(*lsa));
358         lsa->l2tp_family = AF_INET;
359         if (peer) {
360                 if (!inet->inet_dport)
361                         return -ENOTCONN;
362                 lsa->l2tp_conn_id = lsk->peer_conn_id;
363                 lsa->l2tp_addr.s_addr = inet->inet_daddr;
364         } else {
365                 __be32 addr = inet->inet_rcv_saddr;
366                 if (!addr)
367                         addr = inet->inet_saddr;
368                 lsa->l2tp_conn_id = lsk->conn_id;
369                 lsa->l2tp_addr.s_addr = addr;
370         }
371         *uaddr_len = sizeof(*lsa);
372         return 0;
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 kiocb *iocb, 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_fromiovec(skb_put(skb, len), msg->msg_iov, 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 kiocb *iocb, 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_iovec(skb, 0, msg->msg_iov, 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 

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