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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 | if (!pskb_may_pull(skb, 4)) | |
127 | goto discard; | |
128 | ||
129 | /* Point to L2TP header */ | |
130 | optr = ptr = skb->data; | |
131 | session_id = ntohl(*((__be32 *) ptr)); | |
132 | ptr += 4; | |
133 | ||
134 | /* RFC3931: L2TP/IP packets have the first 4 bytes containing | |
135 | * the session_id. If it is 0, the packet is a L2TP control | |
136 | * frame and the session_id value can be discarded. | |
137 | */ | |
138 | if (session_id == 0) { | |
139 | __skb_pull(skb, 4); | |
140 | goto pass_up; | |
141 | } | |
142 | ||
143 | /* Ok, this is a data packet. Lookup the session. */ | |
144 | session = l2tp_session_find(net, NULL, session_id); | |
145 | if (session == NULL) | |
146 | goto discard; | |
147 | ||
148 | tunnel = session->tunnel; | |
149 | if (tunnel == NULL) | |
150 | goto discard; | |
151 | ||
152 | /* Trace packet contents, if enabled */ | |
153 | if (tunnel->debug & L2TP_MSG_DATA) { | |
154 | length = min(32u, skb->len); | |
155 | if (!pskb_may_pull(skb, length)) | |
156 | goto discard; | |
157 | ||
158 | /* Point to L2TP header */ | |
159 | optr = ptr = skb->data; | |
160 | ptr += 4; | |
161 | pr_debug("%s: ip recv\n", tunnel->name); | |
162 | print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, ptr, length); | |
163 | } | |
164 | ||
165 | l2tp_recv_common(session, skb, ptr, optr, 0, skb->len, tunnel->recv_payload_hook); | |
166 | ||
167 | return 0; | |
168 | ||
169 | pass_up: | |
170 | /* Get the tunnel_id from the L2TP header */ | |
171 | if (!pskb_may_pull(skb, 12)) | |
172 | goto discard; | |
173 | ||
174 | if ((skb->data[0] & 0xc0) != 0xc0) | |
175 | goto discard; | |
176 | ||
177 | tunnel_id = ntohl(*(__be32 *) &skb->data[4]); | |
178 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
179 | if (tunnel != NULL) | |
180 | sk = tunnel->sock; | |
181 | else { | |
182 | struct iphdr *iph = (struct iphdr *) skb_network_header(skb); | |
183 | ||
184 | read_lock_bh(&l2tp_ip_lock); | |
185 | sk = __l2tp_ip_bind_lookup(net, iph->daddr, 0, tunnel_id); | |
186 | read_unlock_bh(&l2tp_ip_lock); | |
187 | } | |
188 | ||
189 | if (sk == NULL) | |
190 | goto discard; | |
191 | ||
192 | sock_hold(sk); | |
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_put: | |
202 | sock_put(sk); | |
203 | ||
204 | discard: | |
205 | kfree_skb(skb); | |
206 | return 0; | |
207 | } | |
208 | ||
209 | static int l2tp_ip_open(struct sock *sk) | |
210 | { | |
211 | /* Prevent autobind. We don't have ports. */ | |
212 | inet_sk(sk)->inet_num = IPPROTO_L2TP; | |
213 | ||
214 | write_lock_bh(&l2tp_ip_lock); | |
215 | sk_add_node(sk, &l2tp_ip_table); | |
216 | write_unlock_bh(&l2tp_ip_lock); | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | static void l2tp_ip_close(struct sock *sk, long timeout) | |
222 | { | |
223 | write_lock_bh(&l2tp_ip_lock); | |
224 | hlist_del_init(&sk->sk_bind_node); | |
225 | sk_del_node_init(sk); | |
226 | write_unlock_bh(&l2tp_ip_lock); | |
227 | sk_common_release(sk); | |
228 | } | |
229 | ||
230 | static void l2tp_ip_destroy_sock(struct sock *sk) | |
231 | { | |
232 | struct sk_buff *skb; | |
233 | struct l2tp_tunnel *tunnel = l2tp_sock_to_tunnel(sk); | |
234 | ||
235 | while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) | |
236 | kfree_skb(skb); | |
237 | ||
238 | if (tunnel) { | |
239 | l2tp_tunnel_closeall(tunnel); | |
240 | sock_put(sk); | |
241 | } | |
242 | ||
243 | sk_refcnt_debug_dec(sk); | |
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 (!sock_flag(sk, SOCK_ZAPPED)) | |
255 | return -EINVAL; | |
256 | if (addr_len < sizeof(struct sockaddr_l2tpip)) | |
257 | return -EINVAL; | |
258 | if (addr->l2tp_family != AF_INET) | |
259 | return -EINVAL; | |
260 | ||
261 | ret = -EADDRINUSE; | |
262 | read_lock_bh(&l2tp_ip_lock); | |
263 | if (__l2tp_ip_bind_lookup(net, addr->l2tp_addr.s_addr, | |
264 | sk->sk_bound_dev_if, addr->l2tp_conn_id)) | |
265 | goto out_in_use; | |
266 | ||
267 | read_unlock_bh(&l2tp_ip_lock); | |
268 | ||
269 | lock_sock(sk); | |
270 | if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_l2tpip)) | |
271 | goto out; | |
272 | ||
273 | chk_addr_ret = inet_addr_type(net, addr->l2tp_addr.s_addr); | |
274 | ret = -EADDRNOTAVAIL; | |
275 | if (addr->l2tp_addr.s_addr && chk_addr_ret != RTN_LOCAL && | |
276 | chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) | |
277 | goto out; | |
278 | ||
279 | if (addr->l2tp_addr.s_addr) | |
280 | inet->inet_rcv_saddr = inet->inet_saddr = addr->l2tp_addr.s_addr; | |
281 | if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) | |
282 | inet->inet_saddr = 0; /* Use device */ | |
283 | sk_dst_reset(sk); | |
284 | ||
285 | l2tp_ip_sk(sk)->conn_id = addr->l2tp_conn_id; | |
286 | ||
287 | write_lock_bh(&l2tp_ip_lock); | |
288 | sk_add_bind_node(sk, &l2tp_ip_bind_table); | |
289 | sk_del_node_init(sk); | |
290 | write_unlock_bh(&l2tp_ip_lock); | |
291 | ret = 0; | |
292 | sock_reset_flag(sk, SOCK_ZAPPED); | |
293 | ||
294 | out: | |
295 | release_sock(sk); | |
296 | ||
297 | return ret; | |
298 | ||
299 | out_in_use: | |
300 | read_unlock_bh(&l2tp_ip_lock); | |
301 | ||
302 | return ret; | |
303 | } | |
304 | ||
305 | static int l2tp_ip_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) | |
306 | { | |
307 | struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *) uaddr; | |
308 | int rc; | |
309 | ||
310 | if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ | |
311 | return -EINVAL; | |
312 | ||
313 | if (addr_len < sizeof(*lsa)) | |
314 | return -EINVAL; | |
315 | ||
316 | if (ipv4_is_multicast(lsa->l2tp_addr.s_addr)) | |
317 | return -EINVAL; | |
318 | ||
319 | rc = ip4_datagram_connect(sk, uaddr, addr_len); | |
320 | if (rc < 0) | |
321 | return rc; | |
322 | ||
323 | lock_sock(sk); | |
324 | ||
325 | l2tp_ip_sk(sk)->peer_conn_id = lsa->l2tp_conn_id; | |
326 | ||
327 | write_lock_bh(&l2tp_ip_lock); | |
328 | hlist_del_init(&sk->sk_bind_node); | |
329 | sk_add_bind_node(sk, &l2tp_ip_bind_table); | |
330 | write_unlock_bh(&l2tp_ip_lock); | |
331 | ||
332 | release_sock(sk); | |
333 | return rc; | |
334 | } | |
335 | ||
336 | static int l2tp_ip_disconnect(struct sock *sk, int flags) | |
337 | { | |
338 | if (sock_flag(sk, SOCK_ZAPPED)) | |
339 | return 0; | |
340 | ||
341 | return udp_disconnect(sk, flags); | |
342 | } | |
343 | ||
344 | static int l2tp_ip_getname(struct socket *sock, struct sockaddr *uaddr, | |
345 | int *uaddr_len, int peer) | |
346 | { | |
347 | struct sock *sk = sock->sk; | |
348 | struct inet_sock *inet = inet_sk(sk); | |
349 | struct l2tp_ip_sock *lsk = l2tp_ip_sk(sk); | |
350 | struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *)uaddr; | |
351 | ||
352 | memset(lsa, 0, sizeof(*lsa)); | |
353 | lsa->l2tp_family = AF_INET; | |
354 | if (peer) { | |
355 | if (!inet->inet_dport) | |
356 | return -ENOTCONN; | |
357 | lsa->l2tp_conn_id = lsk->peer_conn_id; | |
358 | lsa->l2tp_addr.s_addr = inet->inet_daddr; | |
359 | } else { | |
360 | __be32 addr = inet->inet_rcv_saddr; | |
361 | if (!addr) | |
362 | addr = inet->inet_saddr; | |
363 | lsa->l2tp_conn_id = lsk->conn_id; | |
364 | lsa->l2tp_addr.s_addr = addr; | |
365 | } | |
366 | *uaddr_len = sizeof(*lsa); | |
367 | return 0; | |
368 | } | |
369 | ||
370 | static int l2tp_ip_backlog_recv(struct sock *sk, struct sk_buff *skb) | |
371 | { | |
372 | int rc; | |
373 | ||
374 | /* Charge it to the socket, dropping if the queue is full. */ | |
375 | rc = sock_queue_rcv_skb(sk, skb); | |
376 | if (rc < 0) | |
377 | goto drop; | |
378 | ||
379 | return 0; | |
380 | ||
381 | drop: | |
382 | IP_INC_STATS(sock_net(sk), IPSTATS_MIB_INDISCARDS); | |
383 | kfree_skb(skb); | |
384 | return -1; | |
385 | } | |
386 | ||
387 | /* Userspace will call sendmsg() on the tunnel socket to send L2TP | |
388 | * control frames. | |
389 | */ | |
390 | static int l2tp_ip_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) | |
391 | { | |
392 | struct sk_buff *skb; | |
393 | int rc; | |
394 | struct inet_sock *inet = inet_sk(sk); | |
395 | struct rtable *rt = NULL; | |
396 | struct flowi4 *fl4; | |
397 | int connected = 0; | |
398 | __be32 daddr; | |
399 | ||
400 | lock_sock(sk); | |
401 | ||
402 | rc = -ENOTCONN; | |
403 | if (sock_flag(sk, SOCK_DEAD)) | |
404 | goto out; | |
405 | ||
406 | /* Get and verify the address. */ | |
407 | if (msg->msg_name) { | |
408 | DECLARE_SOCKADDR(struct sockaddr_l2tpip *, lip, msg->msg_name); | |
409 | rc = -EINVAL; | |
410 | if (msg->msg_namelen < sizeof(*lip)) | |
411 | goto out; | |
412 | ||
413 | if (lip->l2tp_family != AF_INET) { | |
414 | rc = -EAFNOSUPPORT; | |
415 | if (lip->l2tp_family != AF_UNSPEC) | |
416 | goto out; | |
417 | } | |
418 | ||
419 | daddr = lip->l2tp_addr.s_addr; | |
420 | } else { | |
421 | rc = -EDESTADDRREQ; | |
422 | if (sk->sk_state != TCP_ESTABLISHED) | |
423 | goto out; | |
424 | ||
425 | daddr = inet->inet_daddr; | |
426 | connected = 1; | |
427 | } | |
428 | ||
429 | /* Allocate a socket buffer */ | |
430 | rc = -ENOMEM; | |
431 | skb = sock_wmalloc(sk, 2 + NET_SKB_PAD + sizeof(struct iphdr) + | |
432 | 4 + len, 0, GFP_KERNEL); | |
433 | if (!skb) | |
434 | goto error; | |
435 | ||
436 | /* Reserve space for headers, putting IP header on 4-byte boundary. */ | |
437 | skb_reserve(skb, 2 + NET_SKB_PAD); | |
438 | skb_reset_network_header(skb); | |
439 | skb_reserve(skb, sizeof(struct iphdr)); | |
440 | skb_reset_transport_header(skb); | |
441 | ||
442 | /* Insert 0 session_id */ | |
443 | *((__be32 *) skb_put(skb, 4)) = 0; | |
444 | ||
445 | /* Copy user data into skb */ | |
446 | rc = memcpy_from_msg(skb_put(skb, len), msg, len); | |
447 | if (rc < 0) { | |
448 | kfree_skb(skb); | |
449 | goto error; | |
450 | } | |
451 | ||
452 | fl4 = &inet->cork.fl.u.ip4; | |
453 | if (connected) | |
454 | rt = (struct rtable *) __sk_dst_check(sk, 0); | |
455 | ||
456 | rcu_read_lock(); | |
457 | if (rt == NULL) { | |
458 | const struct ip_options_rcu *inet_opt; | |
459 | ||
460 | inet_opt = rcu_dereference(inet->inet_opt); | |
461 | ||
462 | /* Use correct destination address if we have options. */ | |
463 | if (inet_opt && inet_opt->opt.srr) | |
464 | daddr = inet_opt->opt.faddr; | |
465 | ||
466 | /* If this fails, retransmit mechanism of transport layer will | |
467 | * keep trying until route appears or the connection times | |
468 | * itself out. | |
469 | */ | |
470 | rt = ip_route_output_ports(sock_net(sk), fl4, sk, | |
471 | daddr, inet->inet_saddr, | |
472 | inet->inet_dport, inet->inet_sport, | |
473 | sk->sk_protocol, RT_CONN_FLAGS(sk), | |
474 | sk->sk_bound_dev_if); | |
475 | if (IS_ERR(rt)) | |
476 | goto no_route; | |
477 | if (connected) { | |
478 | sk_setup_caps(sk, &rt->dst); | |
479 | } else { | |
480 | skb_dst_set(skb, &rt->dst); | |
481 | goto xmit; | |
482 | } | |
483 | } | |
484 | ||
485 | /* We dont need to clone dst here, it is guaranteed to not disappear. | |
486 | * __dev_xmit_skb() might force a refcount if needed. | |
487 | */ | |
488 | skb_dst_set_noref(skb, &rt->dst); | |
489 | ||
490 | xmit: | |
491 | /* Queue the packet to IP for output */ | |
492 | rc = ip_queue_xmit(sk, skb, &inet->cork.fl); | |
493 | rcu_read_unlock(); | |
494 | ||
495 | error: | |
496 | if (rc >= 0) | |
497 | rc = len; | |
498 | ||
499 | out: | |
500 | release_sock(sk); | |
501 | return rc; | |
502 | ||
503 | no_route: | |
504 | rcu_read_unlock(); | |
505 | IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES); | |
506 | kfree_skb(skb); | |
507 | rc = -EHOSTUNREACH; | |
508 | goto out; | |
509 | } | |
510 | ||
511 | static int l2tp_ip_recvmsg(struct sock *sk, struct msghdr *msg, | |
512 | size_t len, int noblock, int flags, int *addr_len) | |
513 | { | |
514 | struct inet_sock *inet = inet_sk(sk); | |
515 | size_t copied = 0; | |
516 | int err = -EOPNOTSUPP; | |
517 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); | |
518 | struct sk_buff *skb; | |
519 | ||
520 | if (flags & MSG_OOB) | |
521 | goto out; | |
522 | ||
523 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
524 | if (!skb) | |
525 | goto out; | |
526 | ||
527 | copied = skb->len; | |
528 | if (len < copied) { | |
529 | msg->msg_flags |= MSG_TRUNC; | |
530 | copied = len; | |
531 | } | |
532 | ||
533 | err = skb_copy_datagram_msg(skb, 0, msg, copied); | |
534 | if (err) | |
535 | goto done; | |
536 | ||
537 | sock_recv_timestamp(msg, sk, skb); | |
538 | ||
539 | /* Copy the address. */ | |
540 | if (sin) { | |
541 | sin->sin_family = AF_INET; | |
542 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; | |
543 | sin->sin_port = 0; | |
544 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
545 | *addr_len = sizeof(*sin); | |
546 | } | |
547 | if (inet->cmsg_flags) | |
548 | ip_cmsg_recv(msg, skb); | |
549 | if (flags & MSG_TRUNC) | |
550 | copied = skb->len; | |
551 | done: | |
552 | skb_free_datagram(sk, skb); | |
553 | out: | |
554 | return err ? err : copied; | |
555 | } | |
556 | ||
557 | static struct proto l2tp_ip_prot = { | |
558 | .name = "L2TP/IP", | |
559 | .owner = THIS_MODULE, | |
560 | .init = l2tp_ip_open, | |
561 | .close = l2tp_ip_close, | |
562 | .bind = l2tp_ip_bind, | |
563 | .connect = l2tp_ip_connect, | |
564 | .disconnect = l2tp_ip_disconnect, | |
565 | .ioctl = udp_ioctl, | |
566 | .destroy = l2tp_ip_destroy_sock, | |
567 | .setsockopt = ip_setsockopt, | |
568 | .getsockopt = ip_getsockopt, | |
569 | .sendmsg = l2tp_ip_sendmsg, | |
570 | .recvmsg = l2tp_ip_recvmsg, | |
571 | .backlog_rcv = l2tp_ip_backlog_recv, | |
572 | .hash = inet_hash, | |
573 | .unhash = inet_unhash, | |
574 | .obj_size = sizeof(struct l2tp_ip_sock), | |
575 | #ifdef CONFIG_COMPAT | |
576 | .compat_setsockopt = compat_ip_setsockopt, | |
577 | .compat_getsockopt = compat_ip_getsockopt, | |
578 | #endif | |
579 | }; | |
580 | ||
581 | static const struct proto_ops l2tp_ip_ops = { | |
582 | .family = PF_INET, | |
583 | .owner = THIS_MODULE, | |
584 | .release = inet_release, | |
585 | .bind = inet_bind, | |
586 | .connect = inet_dgram_connect, | |
587 | .socketpair = sock_no_socketpair, | |
588 | .accept = sock_no_accept, | |
589 | .getname = l2tp_ip_getname, | |
590 | .poll = datagram_poll, | |
591 | .ioctl = inet_ioctl, | |
592 | .listen = sock_no_listen, | |
593 | .shutdown = inet_shutdown, | |
594 | .setsockopt = sock_common_setsockopt, | |
595 | .getsockopt = sock_common_getsockopt, | |
596 | .sendmsg = inet_sendmsg, | |
597 | .recvmsg = sock_common_recvmsg, | |
598 | .mmap = sock_no_mmap, | |
599 | .sendpage = sock_no_sendpage, | |
600 | #ifdef CONFIG_COMPAT | |
601 | .compat_setsockopt = compat_sock_common_setsockopt, | |
602 | .compat_getsockopt = compat_sock_common_getsockopt, | |
603 | #endif | |
604 | }; | |
605 | ||
606 | static struct inet_protosw l2tp_ip_protosw = { | |
607 | .type = SOCK_DGRAM, | |
608 | .protocol = IPPROTO_L2TP, | |
609 | .prot = &l2tp_ip_prot, | |
610 | .ops = &l2tp_ip_ops, | |
611 | }; | |
612 | ||
613 | static struct net_protocol l2tp_ip_protocol __read_mostly = { | |
614 | .handler = l2tp_ip_recv, | |
615 | .netns_ok = 1, | |
616 | }; | |
617 | ||
618 | static int __init l2tp_ip_init(void) | |
619 | { | |
620 | int err; | |
621 | ||
622 | pr_info("L2TP IP encapsulation support (L2TPv3)\n"); | |
623 | ||
624 | err = proto_register(&l2tp_ip_prot, 1); | |
625 | if (err != 0) | |
626 | goto out; | |
627 | ||
628 | err = inet_add_protocol(&l2tp_ip_protocol, IPPROTO_L2TP); | |
629 | if (err) | |
630 | goto out1; | |
631 | ||
632 | inet_register_protosw(&l2tp_ip_protosw); | |
633 | return 0; | |
634 | ||
635 | out1: | |
636 | proto_unregister(&l2tp_ip_prot); | |
637 | out: | |
638 | return err; | |
639 | } | |
640 | ||
641 | static void __exit l2tp_ip_exit(void) | |
642 | { | |
643 | inet_unregister_protosw(&l2tp_ip_protosw); | |
644 | inet_del_protocol(&l2tp_ip_protocol, IPPROTO_L2TP); | |
645 | proto_unregister(&l2tp_ip_prot); | |
646 | } | |
647 | ||
648 | module_init(l2tp_ip_init); | |
649 | module_exit(l2tp_ip_exit); | |
650 | ||
651 | MODULE_LICENSE("GPL"); | |
652 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); | |
653 | MODULE_DESCRIPTION("L2TP over IP"); | |
654 | MODULE_VERSION("1.0"); | |
655 | ||
656 | /* Use the value of SOCK_DGRAM (2) directory, because __stringify doesn't like | |
657 | * enums | |
658 | */ | |
659 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 2, IPPROTO_L2TP); | |
660 | MODULE_ALIAS_NET_PF_PROTO(PF_INET, IPPROTO_L2TP); |