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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 kiocb *iocb, 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_fromiovec(skb_put(skb, len), msg->msg_iov, 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 kiocb *iocb, 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_iovec(skb, 0, msg->msg_iov, 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 | .no_check = 0, |
610 | }; |
611 | |
612 | static struct net_protocol l2tp_ip_protocol __read_mostly = { |
613 | .handler = l2tp_ip_recv, |
614 | .netns_ok = 1, |
615 | }; |
616 | |
617 | static int __init l2tp_ip_init(void) |
618 | { |
619 | int err; |
620 | |
621 | pr_info("L2TP IP encapsulation support (L2TPv3)\n"); |
622 | |
623 | err = proto_register(&l2tp_ip_prot, 1); |
624 | if (err != 0) |
625 | goto out; |
626 | |
627 | err = inet_add_protocol(&l2tp_ip_protocol, IPPROTO_L2TP); |
628 | if (err) |
629 | goto out1; |
630 | |
631 | inet_register_protosw(&l2tp_ip_protosw); |
632 | return 0; |
633 | |
634 | out1: |
635 | proto_unregister(&l2tp_ip_prot); |
636 | out: |
637 | return err; |
638 | } |
639 | |
640 | static void __exit l2tp_ip_exit(void) |
641 | { |
642 | inet_unregister_protosw(&l2tp_ip_protosw); |
643 | inet_del_protocol(&l2tp_ip_protocol, IPPROTO_L2TP); |
644 | proto_unregister(&l2tp_ip_prot); |
645 | } |
646 | |
647 | module_init(l2tp_ip_init); |
648 | module_exit(l2tp_ip_exit); |
649 | |
650 | MODULE_LICENSE("GPL"); |
651 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); |
652 | MODULE_DESCRIPTION("L2TP over IP"); |
653 | MODULE_VERSION("1.0"); |
654 | |
655 | /* Use the value of SOCK_DGRAM (2) directory, because __stringify doesn't like |
656 | * enums |
657 | */ |
658 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 2, IPPROTO_L2TP); |
659 |
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v2.6.34-rc5
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