Commit | Line | Data |
---|---|---|
0d76751f JC |
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 | ||
a4ca44fa JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
3d753377 | 14 | #include <asm/ioctls.h> |
0d76751f JC |
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 | ||
c8657fd5 JC |
38 | u32 conn_id; |
39 | u32 peer_conn_id; | |
0d76751f JC |
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 | { | |
0d76751f JC |
53 | struct sock *sk; |
54 | ||
b67bfe0d | 55 | sk_for_each_bound(sk, &l2tp_ip_bind_table) { |
0d76751f JC |
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) && | |
e83726b0 | 63 | net_eq(sock_net(sk), net) && |
0d76751f JC |
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 | { | |
9d6ddb19 | 118 | struct net *net = dev_net(skb->dev); |
0d76751f JC |
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; | |
0d76751f | 126 | |
0d76751f JC |
127 | if (!pskb_may_pull(skb, 4)) |
128 | goto discard; | |
129 | ||
e8bf435f HY |
130 | /* Point to L2TP header */ |
131 | optr = ptr = skb->data; | |
0d76751f JC |
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. */ | |
9d6ddb19 | 145 | session = l2tp_session_find(net, NULL, session_id); |
0d76751f JC |
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 | ||
e8bf435f HY |
159 | /* Point to L2TP header */ |
160 | optr = ptr = skb->data; | |
161 | ptr += 4; | |
a4ca44fa JP |
162 | pr_debug("%s: ip recv\n", tunnel->name); |
163 | print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, ptr, length); | |
0d76751f JC |
164 | } |
165 | ||
166 | l2tp_recv_common(session, skb, ptr, optr, 0, skb->len, tunnel->recv_payload_hook); | |
167 | ||
168 | return 0; | |
169 | ||
170 | pass_up: | |
171 | /* Get the tunnel_id from the L2TP header */ | |
172 | if (!pskb_may_pull(skb, 12)) | |
173 | goto discard; | |
174 | ||
175 | if ((skb->data[0] & 0xc0) != 0xc0) | |
176 | goto discard; | |
177 | ||
178 | tunnel_id = ntohl(*(__be32 *) &skb->data[4]); | |
9d6ddb19 | 179 | tunnel = l2tp_tunnel_find(net, tunnel_id); |
0d76751f JC |
180 | if (tunnel != NULL) |
181 | sk = tunnel->sock; | |
182 | else { | |
183 | struct iphdr *iph = (struct iphdr *) skb_network_header(skb); | |
184 | ||
185 | read_lock_bh(&l2tp_ip_lock); | |
9d6ddb19 | 186 | sk = __l2tp_ip_bind_lookup(net, iph->daddr, 0, tunnel_id); |
0d76751f JC |
187 | read_unlock_bh(&l2tp_ip_lock); |
188 | } | |
189 | ||
190 | if (sk == NULL) | |
191 | goto discard; | |
192 | ||
193 | sock_hold(sk); | |
194 | ||
195 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) | |
196 | goto discard_put; | |
197 | ||
198 | nf_reset(skb); | |
199 | ||
200 | return sk_receive_skb(sk, skb, 1); | |
201 | ||
202 | discard_put: | |
203 | sock_put(sk); | |
204 | ||
205 | discard: | |
206 | kfree_skb(skb); | |
207 | return 0; | |
208 | } | |
209 | ||
210 | static int l2tp_ip_open(struct sock *sk) | |
211 | { | |
212 | /* Prevent autobind. We don't have ports. */ | |
213 | inet_sk(sk)->inet_num = IPPROTO_L2TP; | |
214 | ||
215 | write_lock_bh(&l2tp_ip_lock); | |
216 | sk_add_node(sk, &l2tp_ip_table); | |
217 | write_unlock_bh(&l2tp_ip_lock); | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | static void l2tp_ip_close(struct sock *sk, long timeout) | |
223 | { | |
224 | write_lock_bh(&l2tp_ip_lock); | |
225 | hlist_del_init(&sk->sk_bind_node); | |
d1f224ae | 226 | sk_del_node_init(sk); |
0d76751f JC |
227 | write_unlock_bh(&l2tp_ip_lock); |
228 | sk_common_release(sk); | |
229 | } | |
230 | ||
231 | static void l2tp_ip_destroy_sock(struct sock *sk) | |
232 | { | |
233 | struct sk_buff *skb; | |
93606317 | 234 | struct l2tp_tunnel *tunnel = l2tp_sock_to_tunnel(sk); |
0d76751f JC |
235 | |
236 | while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) | |
237 | kfree_skb(skb); | |
238 | ||
93606317 TP |
239 | if (tunnel) { |
240 | l2tp_tunnel_closeall(tunnel); | |
241 | sock_put(sk); | |
242 | } | |
243 | ||
0d76751f JC |
244 | sk_refcnt_debug_dec(sk); |
245 | } | |
246 | ||
247 | static int l2tp_ip_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) | |
248 | { | |
249 | struct inet_sock *inet = inet_sk(sk); | |
250 | struct sockaddr_l2tpip *addr = (struct sockaddr_l2tpip *) uaddr; | |
9d6ddb19 | 251 | struct net *net = sock_net(sk); |
c51ce497 | 252 | int ret; |
0d76751f JC |
253 | int chk_addr_ret; |
254 | ||
c51ce497 JC |
255 | if (addr_len < sizeof(struct sockaddr_l2tpip)) |
256 | return -EINVAL; | |
257 | if (addr->l2tp_family != AF_INET) | |
258 | return -EINVAL; | |
259 | ||
0d76751f JC |
260 | ret = -EADDRINUSE; |
261 | read_lock_bh(&l2tp_ip_lock); | |
9d6ddb19 DM |
262 | if (__l2tp_ip_bind_lookup(net, addr->l2tp_addr.s_addr, |
263 | sk->sk_bound_dev_if, addr->l2tp_conn_id)) | |
0d76751f JC |
264 | goto out_in_use; |
265 | ||
266 | read_unlock_bh(&l2tp_ip_lock); | |
267 | ||
268 | lock_sock(sk); | |
4b9e9796 S |
269 | if (!sock_flag(sk, SOCK_ZAPPED)) |
270 | goto out; | |
271 | ||
0d76751f JC |
272 | if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_l2tpip)) |
273 | goto out; | |
274 | ||
9d6ddb19 | 275 | chk_addr_ret = inet_addr_type(net, addr->l2tp_addr.s_addr); |
0d76751f JC |
276 | ret = -EADDRNOTAVAIL; |
277 | if (addr->l2tp_addr.s_addr && chk_addr_ret != RTN_LOCAL && | |
278 | chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) | |
279 | goto out; | |
280 | ||
c9be48dc JC |
281 | if (addr->l2tp_addr.s_addr) |
282 | inet->inet_rcv_saddr = inet->inet_saddr = addr->l2tp_addr.s_addr; | |
0d76751f JC |
283 | if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) |
284 | inet->inet_saddr = 0; /* Use device */ | |
285 | sk_dst_reset(sk); | |
286 | ||
287 | l2tp_ip_sk(sk)->conn_id = addr->l2tp_conn_id; | |
288 | ||
289 | write_lock_bh(&l2tp_ip_lock); | |
290 | sk_add_bind_node(sk, &l2tp_ip_bind_table); | |
291 | sk_del_node_init(sk); | |
292 | write_unlock_bh(&l2tp_ip_lock); | |
293 | ret = 0; | |
c51ce497 JC |
294 | sock_reset_flag(sk, SOCK_ZAPPED); |
295 | ||
0d76751f JC |
296 | out: |
297 | release_sock(sk); | |
298 | ||
299 | return ret; | |
300 | ||
301 | out_in_use: | |
302 | read_unlock_bh(&l2tp_ip_lock); | |
303 | ||
304 | return ret; | |
305 | } | |
306 | ||
307 | static int l2tp_ip_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) | |
308 | { | |
0d76751f | 309 | struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *) uaddr; |
de3c7a18 | 310 | int rc; |
0d76751f | 311 | |
c51ce497 JC |
312 | if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ |
313 | return -EINVAL; | |
314 | ||
0d76751f | 315 | if (addr_len < sizeof(*lsa)) |
de3c7a18 | 316 | return -EINVAL; |
2f16270f | 317 | |
0d76751f | 318 | if (ipv4_is_multicast(lsa->l2tp_addr.s_addr)) |
de3c7a18 | 319 | return -EINVAL; |
0d76751f | 320 | |
de3c7a18 JC |
321 | rc = ip4_datagram_connect(sk, uaddr, addr_len); |
322 | if (rc < 0) | |
323 | return rc; | |
0d76751f | 324 | |
de3c7a18 | 325 | lock_sock(sk); |
0d76751f JC |
326 | |
327 | l2tp_ip_sk(sk)->peer_conn_id = lsa->l2tp_conn_id; | |
328 | ||
0d76751f JC |
329 | write_lock_bh(&l2tp_ip_lock); |
330 | hlist_del_init(&sk->sk_bind_node); | |
331 | sk_add_bind_node(sk, &l2tp_ip_bind_table); | |
332 | write_unlock_bh(&l2tp_ip_lock); | |
333 | ||
2f16270f | 334 | release_sock(sk); |
0d76751f JC |
335 | return rc; |
336 | } | |
337 | ||
c51ce497 JC |
338 | static int l2tp_ip_disconnect(struct sock *sk, int flags) |
339 | { | |
340 | if (sock_flag(sk, SOCK_ZAPPED)) | |
341 | return 0; | |
342 | ||
343 | return udp_disconnect(sk, flags); | |
344 | } | |
345 | ||
0d76751f JC |
346 | static int l2tp_ip_getname(struct socket *sock, struct sockaddr *uaddr, |
347 | int *uaddr_len, int peer) | |
348 | { | |
349 | struct sock *sk = sock->sk; | |
350 | struct inet_sock *inet = inet_sk(sk); | |
351 | struct l2tp_ip_sock *lsk = l2tp_ip_sk(sk); | |
352 | struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *)uaddr; | |
353 | ||
354 | memset(lsa, 0, sizeof(*lsa)); | |
355 | lsa->l2tp_family = AF_INET; | |
356 | if (peer) { | |
357 | if (!inet->inet_dport) | |
358 | return -ENOTCONN; | |
359 | lsa->l2tp_conn_id = lsk->peer_conn_id; | |
360 | lsa->l2tp_addr.s_addr = inet->inet_daddr; | |
361 | } else { | |
362 | __be32 addr = inet->inet_rcv_saddr; | |
363 | if (!addr) | |
364 | addr = inet->inet_saddr; | |
365 | lsa->l2tp_conn_id = lsk->conn_id; | |
366 | lsa->l2tp_addr.s_addr = addr; | |
367 | } | |
368 | *uaddr_len = sizeof(*lsa); | |
369 | return 0; | |
370 | } | |
371 | ||
372 | static int l2tp_ip_backlog_recv(struct sock *sk, struct sk_buff *skb) | |
373 | { | |
374 | int rc; | |
375 | ||
0d76751f JC |
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: | |
9d6ddb19 | 384 | IP_INC_STATS(sock_net(sk), IPSTATS_MIB_INDISCARDS); |
0d76751f JC |
385 | kfree_skb(skb); |
386 | return -1; | |
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 kiocb *iocb, struct sock *sk, struct msghdr *msg, size_t len) | |
393 | { | |
394 | struct sk_buff *skb; | |
395 | int rc; | |
0d76751f | 396 | struct inet_sock *inet = inet_sk(sk); |
0d76751f | 397 | struct rtable *rt = NULL; |
fdbb0f07 | 398 | struct flowi4 *fl4; |
0d76751f JC |
399 | int connected = 0; |
400 | __be32 daddr; | |
401 | ||
2f16270f DM |
402 | lock_sock(sk); |
403 | ||
404 | rc = -ENOTCONN; | |
0d76751f | 405 | if (sock_flag(sk, SOCK_DEAD)) |
2f16270f | 406 | goto out; |
0d76751f JC |
407 | |
408 | /* Get and verify the address. */ | |
409 | if (msg->msg_name) { | |
410 | struct sockaddr_l2tpip *lip = (struct sockaddr_l2tpip *) msg->msg_name; | |
2f16270f | 411 | rc = -EINVAL; |
0d76751f | 412 | if (msg->msg_namelen < sizeof(*lip)) |
2f16270f | 413 | goto out; |
0d76751f JC |
414 | |
415 | if (lip->l2tp_family != AF_INET) { | |
2f16270f | 416 | rc = -EAFNOSUPPORT; |
0d76751f | 417 | if (lip->l2tp_family != AF_UNSPEC) |
2f16270f | 418 | goto out; |
0d76751f JC |
419 | } |
420 | ||
421 | daddr = lip->l2tp_addr.s_addr; | |
422 | } else { | |
84768edb | 423 | rc = -EDESTADDRREQ; |
0d76751f | 424 | if (sk->sk_state != TCP_ESTABLISHED) |
84768edb | 425 | goto out; |
0d76751f JC |
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_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
449 | if (rc < 0) { | |
450 | kfree_skb(skb); | |
451 | goto error; | |
452 | } | |
453 | ||
fdbb0f07 | 454 | fl4 = &inet->cork.fl.u.ip4; |
0d76751f JC |
455 | if (connected) |
456 | rt = (struct rtable *) __sk_dst_check(sk, 0); | |
457 | ||
081b1b1b | 458 | rcu_read_lock(); |
0d76751f | 459 | if (rt == NULL) { |
081b1b1b | 460 | const struct ip_options_rcu *inet_opt; |
f6d8bd05 | 461 | |
778865a5 | 462 | inet_opt = rcu_dereference(inet->inet_opt); |
f6d8bd05 | 463 | |
0d76751f | 464 | /* Use correct destination address if we have options. */ |
f6d8bd05 ED |
465 | if (inet_opt && inet_opt->opt.srr) |
466 | daddr = inet_opt->opt.faddr; | |
0d76751f | 467 | |
78fbfd8a DM |
468 | /* If this fails, retransmit mechanism of transport layer will |
469 | * keep trying until route appears or the connection times | |
470 | * itself out. | |
471 | */ | |
fdbb0f07 | 472 | rt = ip_route_output_ports(sock_net(sk), fl4, sk, |
78fbfd8a DM |
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; | |
4399a4df | 479 | if (connected) { |
081b1b1b | 480 | sk_setup_caps(sk, &rt->dst); |
4399a4df ED |
481 | } else { |
482 | skb_dst_set(skb, &rt->dst); | |
483 | goto xmit; | |
484 | } | |
0d76751f | 485 | } |
081b1b1b ED |
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); | |
0d76751f | 491 | |
4399a4df | 492 | xmit: |
0d76751f | 493 | /* Queue the packet to IP for output */ |
d9d8da80 | 494 | rc = ip_queue_xmit(skb, &inet->cork.fl); |
081b1b1b | 495 | rcu_read_unlock(); |
0d76751f JC |
496 | |
497 | error: | |
c8657fd5 | 498 | if (rc >= 0) |
0d76751f | 499 | rc = len; |
0d76751f | 500 | |
2f16270f DM |
501 | out: |
502 | release_sock(sk); | |
0d76751f JC |
503 | return rc; |
504 | ||
505 | no_route: | |
081b1b1b | 506 | rcu_read_unlock(); |
0d76751f JC |
507 | IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES); |
508 | kfree_skb(skb); | |
2f16270f DM |
509 | rc = -EHOSTUNREACH; |
510 | goto out; | |
0d76751f JC |
511 | } |
512 | ||
513 | static int l2tp_ip_recvmsg(struct kiocb *iocb, 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); | |
0d76751f JC |
517 | size_t copied = 0; |
518 | int err = -EOPNOTSUPP; | |
519 | struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; | |
520 | struct sk_buff *skb; | |
521 | ||
522 | if (flags & MSG_OOB) | |
523 | goto out; | |
524 | ||
0d76751f JC |
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_iovec(skb, 0, msg->msg_iov, 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)); | |
a2214488 | 547 | *addr_len = sizeof(*sin); |
0d76751f JC |
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: | |
c8657fd5 | 556 | return err ? err : copied; |
0d76751f JC |
557 | } |
558 | ||
3d753377 ED |
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 | ||
fc130840 | 583 | static struct proto l2tp_ip_prot = { |
0d76751f JC |
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, | |
c51ce497 | 590 | .disconnect = l2tp_ip_disconnect, |
3d753377 | 591 | .ioctl = l2tp_ioctl, |
0d76751f JC |
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 | .no_check = 0, | |
638 | }; | |
639 | ||
640 | static struct net_protocol l2tp_ip_protocol __read_mostly = { | |
641 | .handler = l2tp_ip_recv, | |
9d6ddb19 | 642 | .netns_ok = 1, |
0d76751f JC |
643 | }; |
644 | ||
645 | static int __init l2tp_ip_init(void) | |
646 | { | |
647 | int err; | |
648 | ||
a4ca44fa | 649 | pr_info("L2TP IP encapsulation support (L2TPv3)\n"); |
0d76751f JC |
650 | |
651 | err = proto_register(&l2tp_ip_prot, 1); | |
652 | if (err != 0) | |
653 | goto out; | |
654 | ||
655 | err = inet_add_protocol(&l2tp_ip_protocol, IPPROTO_L2TP); | |
656 | if (err) | |
657 | goto out1; | |
658 | ||
659 | inet_register_protosw(&l2tp_ip_protosw); | |
660 | return 0; | |
661 | ||
662 | out1: | |
663 | proto_unregister(&l2tp_ip_prot); | |
664 | out: | |
665 | return err; | |
666 | } | |
667 | ||
668 | static void __exit l2tp_ip_exit(void) | |
669 | { | |
670 | inet_unregister_protosw(&l2tp_ip_protosw); | |
671 | inet_del_protocol(&l2tp_ip_protocol, IPPROTO_L2TP); | |
672 | proto_unregister(&l2tp_ip_prot); | |
673 | } | |
674 | ||
675 | module_init(l2tp_ip_init); | |
676 | module_exit(l2tp_ip_exit); | |
677 | ||
678 | MODULE_LICENSE("GPL"); | |
679 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); | |
680 | MODULE_DESCRIPTION("L2TP over IP"); | |
681 | MODULE_VERSION("1.0"); | |
e8d34a88 | 682 | |
e9c54999 | 683 | /* Use the value of SOCK_DGRAM (2) directory, because __stringify doesn't like |
e8d34a88 MM |
684 | * enums |
685 | */ | |
686 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 2, IPPROTO_L2TP); |