]>
Commit | Line | Data |
---|---|---|
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 | int length; | |
127 | ||
128 | if (!pskb_may_pull(skb, 4)) | |
129 | goto discard; | |
130 | ||
131 | /* Point to L2TP header */ | |
132 | optr = ptr = skb->data; | |
133 | session_id = ntohl(*((__be32 *) ptr)); | |
134 | ptr += 4; | |
135 | ||
136 | /* RFC3931: L2TP/IP packets have the first 4 bytes containing | |
137 | * the session_id. If it is 0, the packet is a L2TP control | |
138 | * frame and the session_id value can be discarded. | |
139 | */ | |
140 | if (session_id == 0) { | |
141 | __skb_pull(skb, 4); | |
142 | goto pass_up; | |
143 | } | |
144 | ||
145 | /* Ok, this is a data packet. Lookup the session. */ | |
146 | session = l2tp_session_get(net, NULL, session_id, true); | |
147 | if (!session) | |
148 | goto discard; | |
149 | ||
150 | tunnel = session->tunnel; | |
151 | if (!tunnel) | |
152 | goto discard_sess; | |
153 | ||
154 | /* Trace packet contents, if enabled */ | |
155 | if (tunnel->debug & L2TP_MSG_DATA) { | |
156 | length = min(32u, skb->len); | |
157 | if (!pskb_may_pull(skb, length)) | |
158 | goto discard_sess; | |
159 | ||
160 | /* Point to L2TP header */ | |
161 | optr = ptr = skb->data; | |
162 | ptr += 4; | |
163 | pr_debug("%s: ip recv\n", tunnel->name); | |
164 | print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, ptr, length); | |
165 | } | |
166 | ||
167 | l2tp_recv_common(session, skb, ptr, optr, 0, skb->len, tunnel->recv_payload_hook); | |
168 | l2tp_session_dec_refcount(session); | |
169 | ||
170 | return 0; | |
171 | ||
172 | pass_up: | |
173 | /* Get the tunnel_id from the L2TP header */ | |
174 | if (!pskb_may_pull(skb, 12)) | |
175 | goto discard; | |
176 | ||
177 | if ((skb->data[0] & 0xc0) != 0xc0) | |
178 | goto discard; | |
179 | ||
180 | tunnel_id = ntohl(*(__be32 *) &skb->data[4]); | |
181 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
182 | if (tunnel) { | |
183 | sk = tunnel->sock; | |
184 | sock_hold(sk); | |
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, iph->saddr, | |
190 | inet_iif(skb), tunnel_id); | |
191 | if (!sk) { | |
192 | read_unlock_bh(&l2tp_ip_lock); | |
193 | goto discard; | |
194 | } | |
195 | ||
196 | sock_hold(sk); | |
197 | read_unlock_bh(&l2tp_ip_lock); | |
198 | } | |
199 | ||
200 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) | |
201 | goto discard_put; | |
202 | ||
203 | nf_reset(skb); | |
204 | ||
205 | return sk_receive_skb(sk, skb, 1); | |
206 | ||
207 | discard_sess: | |
208 | if (session->deref) | |
209 | session->deref(session); | |
210 | l2tp_session_dec_refcount(session); | |
211 | goto discard; | |
212 | ||
213 | discard_put: | |
214 | sock_put(sk); | |
215 | ||
216 | discard: | |
217 | kfree_skb(skb); | |
218 | return 0; | |
219 | } | |
220 | ||
221 | static int l2tp_ip_open(struct sock *sk) | |
222 | { | |
223 | /* Prevent autobind. We don't have ports. */ | |
224 | inet_sk(sk)->inet_num = IPPROTO_L2TP; | |
225 | ||
226 | write_lock_bh(&l2tp_ip_lock); | |
227 | sk_add_node(sk, &l2tp_ip_table); | |
228 | write_unlock_bh(&l2tp_ip_lock); | |
229 | ||
230 | return 0; | |
231 | } | |
232 | ||
233 | static void l2tp_ip_close(struct sock *sk, long timeout) | |
234 | { | |
235 | write_lock_bh(&l2tp_ip_lock); | |
236 | hlist_del_init(&sk->sk_bind_node); | |
237 | sk_del_node_init(sk); | |
238 | write_unlock_bh(&l2tp_ip_lock); | |
239 | sk_common_release(sk); | |
240 | } | |
241 | ||
242 | static void l2tp_ip_destroy_sock(struct sock *sk) | |
243 | { | |
244 | struct sk_buff *skb; | |
245 | struct l2tp_tunnel *tunnel = l2tp_sock_to_tunnel(sk); | |
246 | ||
247 | while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) | |
248 | kfree_skb(skb); | |
249 | ||
250 | if (tunnel) { | |
251 | l2tp_tunnel_closeall(tunnel); | |
252 | sock_put(sk); | |
253 | } | |
254 | ||
255 | sk_refcnt_debug_dec(sk); | |
256 | } | |
257 | ||
258 | static int l2tp_ip_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) | |
259 | { | |
260 | struct inet_sock *inet = inet_sk(sk); | |
261 | struct sockaddr_l2tpip *addr = (struct sockaddr_l2tpip *) uaddr; | |
262 | struct net *net = sock_net(sk); | |
263 | int ret; | |
264 | int chk_addr_ret; | |
265 | ||
266 | if (addr_len < sizeof(struct sockaddr_l2tpip)) | |
267 | return -EINVAL; | |
268 | if (addr->l2tp_family != AF_INET) | |
269 | return -EINVAL; | |
270 | ||
271 | lock_sock(sk); | |
272 | ||
273 | ret = -EINVAL; | |
274 | if (!sock_flag(sk, SOCK_ZAPPED)) | |
275 | goto out; | |
276 | ||
277 | if (sk->sk_state != TCP_CLOSE) | |
278 | goto out; | |
279 | ||
280 | chk_addr_ret = inet_addr_type(net, addr->l2tp_addr.s_addr); | |
281 | ret = -EADDRNOTAVAIL; | |
282 | if (addr->l2tp_addr.s_addr && chk_addr_ret != RTN_LOCAL && | |
283 | chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) | |
284 | goto out; | |
285 | ||
286 | if (addr->l2tp_addr.s_addr) | |
287 | inet->inet_rcv_saddr = inet->inet_saddr = addr->l2tp_addr.s_addr; | |
288 | if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) | |
289 | inet->inet_saddr = 0; /* Use device */ | |
290 | ||
291 | write_lock_bh(&l2tp_ip_lock); | |
292 | if (__l2tp_ip_bind_lookup(net, addr->l2tp_addr.s_addr, 0, | |
293 | sk->sk_bound_dev_if, addr->l2tp_conn_id)) { | |
294 | write_unlock_bh(&l2tp_ip_lock); | |
295 | ret = -EADDRINUSE; | |
296 | goto out; | |
297 | } | |
298 | ||
299 | sk_dst_reset(sk); | |
300 | l2tp_ip_sk(sk)->conn_id = addr->l2tp_conn_id; | |
301 | ||
302 | sk_add_bind_node(sk, &l2tp_ip_bind_table); | |
303 | sk_del_node_init(sk); | |
304 | write_unlock_bh(&l2tp_ip_lock); | |
305 | ||
306 | ret = 0; | |
307 | sock_reset_flag(sk, SOCK_ZAPPED); | |
308 | ||
309 | out: | |
310 | release_sock(sk); | |
311 | ||
312 | return ret; | |
313 | } | |
314 | ||
315 | static int l2tp_ip_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) | |
316 | { | |
317 | struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *) uaddr; | |
318 | int rc; | |
319 | ||
320 | if (addr_len < sizeof(*lsa)) | |
321 | return -EINVAL; | |
322 | ||
323 | if (ipv4_is_multicast(lsa->l2tp_addr.s_addr)) | |
324 | return -EINVAL; | |
325 | ||
326 | lock_sock(sk); | |
327 | ||
328 | /* Must bind first - autobinding does not work */ | |
329 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
330 | rc = -EINVAL; | |
331 | goto out_sk; | |
332 | } | |
333 | ||
334 | rc = __ip4_datagram_connect(sk, uaddr, addr_len); | |
335 | if (rc < 0) | |
336 | goto out_sk; | |
337 | ||
338 | l2tp_ip_sk(sk)->peer_conn_id = lsa->l2tp_conn_id; | |
339 | ||
340 | write_lock_bh(&l2tp_ip_lock); | |
341 | hlist_del_init(&sk->sk_bind_node); | |
342 | sk_add_bind_node(sk, &l2tp_ip_bind_table); | |
343 | write_unlock_bh(&l2tp_ip_lock); | |
344 | ||
345 | out_sk: | |
346 | release_sock(sk); | |
347 | ||
348 | return rc; | |
349 | } | |
350 | ||
351 | static int l2tp_ip_disconnect(struct sock *sk, int flags) | |
352 | { | |
353 | if (sock_flag(sk, SOCK_ZAPPED)) | |
354 | return 0; | |
355 | ||
356 | return __udp_disconnect(sk, flags); | |
357 | } | |
358 | ||
359 | static int l2tp_ip_getname(struct socket *sock, struct sockaddr *uaddr, | |
360 | int *uaddr_len, int peer) | |
361 | { | |
362 | struct sock *sk = sock->sk; | |
363 | struct inet_sock *inet = inet_sk(sk); | |
364 | struct l2tp_ip_sock *lsk = l2tp_ip_sk(sk); | |
365 | struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *)uaddr; | |
366 | ||
367 | memset(lsa, 0, sizeof(*lsa)); | |
368 | lsa->l2tp_family = AF_INET; | |
369 | if (peer) { | |
370 | if (!inet->inet_dport) | |
371 | return -ENOTCONN; | |
372 | lsa->l2tp_conn_id = lsk->peer_conn_id; | |
373 | lsa->l2tp_addr.s_addr = inet->inet_daddr; | |
374 | } else { | |
375 | __be32 addr = inet->inet_rcv_saddr; | |
376 | if (!addr) | |
377 | addr = inet->inet_saddr; | |
378 | lsa->l2tp_conn_id = lsk->conn_id; | |
379 | lsa->l2tp_addr.s_addr = addr; | |
380 | } | |
381 | *uaddr_len = sizeof(*lsa); | |
382 | return 0; | |
383 | } | |
384 | ||
385 | static int l2tp_ip_backlog_recv(struct sock *sk, struct sk_buff *skb) | |
386 | { | |
387 | int rc; | |
388 | ||
389 | /* Charge it to the socket, dropping if the queue is full. */ | |
390 | rc = sock_queue_rcv_skb(sk, skb); | |
391 | if (rc < 0) | |
392 | goto drop; | |
393 | ||
394 | return 0; | |
395 | ||
396 | drop: | |
397 | IP_INC_STATS(sock_net(sk), IPSTATS_MIB_INDISCARDS); | |
398 | kfree_skb(skb); | |
399 | return 0; | |
400 | } | |
401 | ||
402 | /* Userspace will call sendmsg() on the tunnel socket to send L2TP | |
403 | * control frames. | |
404 | */ | |
405 | static int l2tp_ip_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) | |
406 | { | |
407 | struct sk_buff *skb; | |
408 | int rc; | |
409 | struct inet_sock *inet = inet_sk(sk); | |
410 | struct rtable *rt = NULL; | |
411 | struct flowi4 *fl4; | |
412 | int connected = 0; | |
413 | __be32 daddr; | |
414 | ||
415 | lock_sock(sk); | |
416 | ||
417 | rc = -ENOTCONN; | |
418 | if (sock_flag(sk, SOCK_DEAD)) | |
419 | goto out; | |
420 | ||
421 | /* Get and verify the address. */ | |
422 | if (msg->msg_name) { | |
423 | DECLARE_SOCKADDR(struct sockaddr_l2tpip *, lip, msg->msg_name); | |
424 | rc = -EINVAL; | |
425 | if (msg->msg_namelen < sizeof(*lip)) | |
426 | goto out; | |
427 | ||
428 | if (lip->l2tp_family != AF_INET) { | |
429 | rc = -EAFNOSUPPORT; | |
430 | if (lip->l2tp_family != AF_UNSPEC) | |
431 | goto out; | |
432 | } | |
433 | ||
434 | daddr = lip->l2tp_addr.s_addr; | |
435 | } else { | |
436 | rc = -EDESTADDRREQ; | |
437 | if (sk->sk_state != TCP_ESTABLISHED) | |
438 | goto out; | |
439 | ||
440 | daddr = inet->inet_daddr; | |
441 | connected = 1; | |
442 | } | |
443 | ||
444 | /* Allocate a socket buffer */ | |
445 | rc = -ENOMEM; | |
446 | skb = sock_wmalloc(sk, 2 + NET_SKB_PAD + sizeof(struct iphdr) + | |
447 | 4 + len, 0, GFP_KERNEL); | |
448 | if (!skb) | |
449 | goto error; | |
450 | ||
451 | /* Reserve space for headers, putting IP header on 4-byte boundary. */ | |
452 | skb_reserve(skb, 2 + NET_SKB_PAD); | |
453 | skb_reset_network_header(skb); | |
454 | skb_reserve(skb, sizeof(struct iphdr)); | |
455 | skb_reset_transport_header(skb); | |
456 | ||
457 | /* Insert 0 session_id */ | |
458 | *((__be32 *) skb_put(skb, 4)) = 0; | |
459 | ||
460 | /* Copy user data into skb */ | |
461 | rc = memcpy_from_msg(skb_put(skb, len), msg, len); | |
462 | if (rc < 0) { | |
463 | kfree_skb(skb); | |
464 | goto error; | |
465 | } | |
466 | ||
467 | fl4 = &inet->cork.fl.u.ip4; | |
468 | if (connected) | |
469 | rt = (struct rtable *) __sk_dst_check(sk, 0); | |
470 | ||
471 | rcu_read_lock(); | |
472 | if (rt == NULL) { | |
473 | const struct ip_options_rcu *inet_opt; | |
474 | ||
475 | inet_opt = rcu_dereference(inet->inet_opt); | |
476 | ||
477 | /* Use correct destination address if we have options. */ | |
478 | if (inet_opt && inet_opt->opt.srr) | |
479 | daddr = inet_opt->opt.faddr; | |
480 | ||
481 | /* If this fails, retransmit mechanism of transport layer will | |
482 | * keep trying until route appears or the connection times | |
483 | * itself out. | |
484 | */ | |
485 | rt = ip_route_output_ports(sock_net(sk), fl4, sk, | |
486 | daddr, inet->inet_saddr, | |
487 | inet->inet_dport, inet->inet_sport, | |
488 | sk->sk_protocol, RT_CONN_FLAGS(sk), | |
489 | sk->sk_bound_dev_if); | |
490 | if (IS_ERR(rt)) | |
491 | goto no_route; | |
492 | if (connected) { | |
493 | sk_setup_caps(sk, &rt->dst); | |
494 | } else { | |
495 | skb_dst_set(skb, &rt->dst); | |
496 | goto xmit; | |
497 | } | |
498 | } | |
499 | ||
500 | /* We dont need to clone dst here, it is guaranteed to not disappear. | |
501 | * __dev_xmit_skb() might force a refcount if needed. | |
502 | */ | |
503 | skb_dst_set_noref(skb, &rt->dst); | |
504 | ||
505 | xmit: | |
506 | /* Queue the packet to IP for output */ | |
507 | rc = ip_queue_xmit(sk, skb, &inet->cork.fl); | |
508 | rcu_read_unlock(); | |
509 | ||
510 | error: | |
511 | if (rc >= 0) | |
512 | rc = len; | |
513 | ||
514 | out: | |
515 | release_sock(sk); | |
516 | return rc; | |
517 | ||
518 | no_route: | |
519 | rcu_read_unlock(); | |
520 | IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES); | |
521 | kfree_skb(skb); | |
522 | rc = -EHOSTUNREACH; | |
523 | goto out; | |
524 | } | |
525 | ||
526 | static int l2tp_ip_recvmsg(struct sock *sk, struct msghdr *msg, | |
527 | size_t len, int noblock, int flags, int *addr_len) | |
528 | { | |
529 | struct inet_sock *inet = inet_sk(sk); | |
530 | size_t copied = 0; | |
531 | int err = -EOPNOTSUPP; | |
532 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); | |
533 | struct sk_buff *skb; | |
534 | ||
535 | if (flags & MSG_OOB) | |
536 | goto out; | |
537 | ||
538 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
539 | if (!skb) | |
540 | goto out; | |
541 | ||
542 | copied = skb->len; | |
543 | if (len < copied) { | |
544 | msg->msg_flags |= MSG_TRUNC; | |
545 | copied = len; | |
546 | } | |
547 | ||
548 | err = skb_copy_datagram_msg(skb, 0, msg, copied); | |
549 | if (err) | |
550 | goto done; | |
551 | ||
552 | sock_recv_timestamp(msg, sk, skb); | |
553 | ||
554 | /* Copy the address. */ | |
555 | if (sin) { | |
556 | sin->sin_family = AF_INET; | |
557 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; | |
558 | sin->sin_port = 0; | |
559 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
560 | *addr_len = sizeof(*sin); | |
561 | } | |
562 | if (inet->cmsg_flags) | |
563 | ip_cmsg_recv(msg, skb); | |
564 | if (flags & MSG_TRUNC) | |
565 | copied = skb->len; | |
566 | done: | |
567 | skb_free_datagram(sk, skb); | |
568 | out: | |
569 | return err ? err : copied; | |
570 | } | |
571 | ||
572 | int l2tp_ioctl(struct sock *sk, int cmd, unsigned long arg) | |
573 | { | |
574 | struct sk_buff *skb; | |
575 | int amount; | |
576 | ||
577 | switch (cmd) { | |
578 | case SIOCOUTQ: | |
579 | amount = sk_wmem_alloc_get(sk); | |
580 | break; | |
581 | case SIOCINQ: | |
582 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
583 | skb = skb_peek(&sk->sk_receive_queue); | |
584 | amount = skb ? skb->len : 0; | |
585 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
586 | break; | |
587 | ||
588 | default: | |
589 | return -ENOIOCTLCMD; | |
590 | } | |
591 | ||
592 | return put_user(amount, (int __user *)arg); | |
593 | } | |
594 | EXPORT_SYMBOL(l2tp_ioctl); | |
595 | ||
596 | static struct proto l2tp_ip_prot = { | |
597 | .name = "L2TP/IP", | |
598 | .owner = THIS_MODULE, | |
599 | .init = l2tp_ip_open, | |
600 | .close = l2tp_ip_close, | |
601 | .bind = l2tp_ip_bind, | |
602 | .connect = l2tp_ip_connect, | |
603 | .disconnect = l2tp_ip_disconnect, | |
604 | .ioctl = l2tp_ioctl, | |
605 | .destroy = l2tp_ip_destroy_sock, | |
606 | .setsockopt = ip_setsockopt, | |
607 | .getsockopt = ip_getsockopt, | |
608 | .sendmsg = l2tp_ip_sendmsg, | |
609 | .recvmsg = l2tp_ip_recvmsg, | |
610 | .backlog_rcv = l2tp_ip_backlog_recv, | |
611 | .hash = inet_hash, | |
612 | .unhash = inet_unhash, | |
613 | .obj_size = sizeof(struct l2tp_ip_sock), | |
614 | #ifdef CONFIG_COMPAT | |
615 | .compat_setsockopt = compat_ip_setsockopt, | |
616 | .compat_getsockopt = compat_ip_getsockopt, | |
617 | #endif | |
618 | }; | |
619 | ||
620 | static const struct proto_ops l2tp_ip_ops = { | |
621 | .family = PF_INET, | |
622 | .owner = THIS_MODULE, | |
623 | .release = inet_release, | |
624 | .bind = inet_bind, | |
625 | .connect = inet_dgram_connect, | |
626 | .socketpair = sock_no_socketpair, | |
627 | .accept = sock_no_accept, | |
628 | .getname = l2tp_ip_getname, | |
629 | .poll = datagram_poll, | |
630 | .ioctl = inet_ioctl, | |
631 | .listen = sock_no_listen, | |
632 | .shutdown = inet_shutdown, | |
633 | .setsockopt = sock_common_setsockopt, | |
634 | .getsockopt = sock_common_getsockopt, | |
635 | .sendmsg = inet_sendmsg, | |
636 | .recvmsg = sock_common_recvmsg, | |
637 | .mmap = sock_no_mmap, | |
638 | .sendpage = sock_no_sendpage, | |
639 | #ifdef CONFIG_COMPAT | |
640 | .compat_setsockopt = compat_sock_common_setsockopt, | |
641 | .compat_getsockopt = compat_sock_common_getsockopt, | |
642 | #endif | |
643 | }; | |
644 | ||
645 | static struct inet_protosw l2tp_ip_protosw = { | |
646 | .type = SOCK_DGRAM, | |
647 | .protocol = IPPROTO_L2TP, | |
648 | .prot = &l2tp_ip_prot, | |
649 | .ops = &l2tp_ip_ops, | |
650 | }; | |
651 | ||
652 | static struct net_protocol l2tp_ip_protocol __read_mostly = { | |
653 | .handler = l2tp_ip_recv, | |
654 | .netns_ok = 1, | |
655 | }; | |
656 | ||
657 | static int __init l2tp_ip_init(void) | |
658 | { | |
659 | int err; | |
660 | ||
661 | pr_info("L2TP IP encapsulation support (L2TPv3)\n"); | |
662 | ||
663 | err = proto_register(&l2tp_ip_prot, 1); | |
664 | if (err != 0) | |
665 | goto out; | |
666 | ||
667 | err = inet_add_protocol(&l2tp_ip_protocol, IPPROTO_L2TP); | |
668 | if (err) | |
669 | goto out1; | |
670 | ||
671 | inet_register_protosw(&l2tp_ip_protosw); | |
672 | return 0; | |
673 | ||
674 | out1: | |
675 | proto_unregister(&l2tp_ip_prot); | |
676 | out: | |
677 | return err; | |
678 | } | |
679 | ||
680 | static void __exit l2tp_ip_exit(void) | |
681 | { | |
682 | inet_unregister_protosw(&l2tp_ip_protosw); | |
683 | inet_del_protocol(&l2tp_ip_protocol, IPPROTO_L2TP); | |
684 | proto_unregister(&l2tp_ip_prot); | |
685 | } | |
686 | ||
687 | module_init(l2tp_ip_init); | |
688 | module_exit(l2tp_ip_exit); | |
689 | ||
690 | MODULE_LICENSE("GPL"); | |
691 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); | |
692 | MODULE_DESCRIPTION("L2TP over IP"); | |
693 | MODULE_VERSION("1.0"); | |
694 | ||
695 | /* Use the value of SOCK_DGRAM (2) directory, because __stringify doesn't like | |
696 | * enums | |
697 | */ | |
698 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 2, IPPROTO_L2TP); | |
699 | MODULE_ALIAS_NET_PF_PROTO(PF_INET, IPPROTO_L2TP); |