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 | ||
12 | #include <linux/icmp.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/random.h> | |
16 | #include <linux/socket.h> | |
17 | #include <linux/l2tp.h> | |
18 | #include <linux/in.h> | |
19 | #include <net/sock.h> | |
20 | #include <net/ip.h> | |
21 | #include <net/icmp.h> | |
22 | #include <net/udp.h> | |
23 | #include <net/inet_common.h> | |
24 | #include <net/inet_hashtables.h> | |
25 | #include <net/tcp_states.h> | |
26 | #include <net/protocol.h> | |
27 | #include <net/xfrm.h> | |
28 | ||
29 | #include "l2tp_core.h" | |
30 | ||
31 | struct l2tp_ip_sock { | |
32 | /* inet_sock has to be the first member of l2tp_ip_sock */ | |
33 | struct inet_sock inet; | |
34 | ||
35 | __u32 conn_id; | |
36 | __u32 peer_conn_id; | |
37 | ||
38 | __u64 tx_packets; | |
39 | __u64 tx_bytes; | |
40 | __u64 tx_errors; | |
41 | __u64 rx_packets; | |
42 | __u64 rx_bytes; | |
43 | __u64 rx_errors; | |
44 | }; | |
45 | ||
46 | static DEFINE_RWLOCK(l2tp_ip_lock); | |
47 | static struct hlist_head l2tp_ip_table; | |
48 | static struct hlist_head l2tp_ip_bind_table; | |
49 | ||
50 | static inline struct l2tp_ip_sock *l2tp_ip_sk(const struct sock *sk) | |
51 | { | |
52 | return (struct l2tp_ip_sock *)sk; | |
53 | } | |
54 | ||
55 | static struct sock *__l2tp_ip_bind_lookup(struct net *net, __be32 laddr, int dif, u32 tunnel_id) | |
56 | { | |
57 | struct hlist_node *node; | |
58 | struct sock *sk; | |
59 | ||
60 | sk_for_each_bound(sk, node, &l2tp_ip_bind_table) { | |
61 | struct inet_sock *inet = inet_sk(sk); | |
62 | struct l2tp_ip_sock *l2tp = l2tp_ip_sk(sk); | |
63 | ||
64 | if (l2tp == NULL) | |
65 | continue; | |
66 | ||
67 | if ((l2tp->conn_id == tunnel_id) && | |
e83726b0 | 68 | net_eq(sock_net(sk), net) && |
0d76751f JC |
69 | !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) && |
70 | !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)) | |
71 | goto found; | |
72 | } | |
73 | ||
74 | sk = NULL; | |
75 | found: | |
76 | return sk; | |
77 | } | |
78 | ||
79 | static inline struct sock *l2tp_ip_bind_lookup(struct net *net, __be32 laddr, int dif, u32 tunnel_id) | |
80 | { | |
81 | struct sock *sk = __l2tp_ip_bind_lookup(net, laddr, dif, tunnel_id); | |
82 | if (sk) | |
83 | sock_hold(sk); | |
84 | ||
85 | return sk; | |
86 | } | |
87 | ||
88 | /* When processing receive frames, there are two cases to | |
89 | * consider. Data frames consist of a non-zero session-id and an | |
90 | * optional cookie. Control frames consist of a regular L2TP header | |
91 | * preceded by 32-bits of zeros. | |
92 | * | |
93 | * L2TPv3 Session Header Over IP | |
94 | * | |
95 | * 0 1 2 3 | |
96 | * 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 | |
97 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
98 | * | Session ID | | |
99 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
100 | * | Cookie (optional, maximum 64 bits)... | |
101 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
102 | * | | |
103 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
104 | * | |
105 | * L2TPv3 Control Message Header Over IP | |
106 | * | |
107 | * 0 1 2 3 | |
108 | * 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 | |
109 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
110 | * | (32 bits of zeros) | | |
111 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
112 | * |T|L|x|x|S|x|x|x|x|x|x|x| Ver | Length | | |
113 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
114 | * | Control Connection ID | | |
115 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
116 | * | Ns | Nr | | |
117 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
118 | * | |
119 | * All control frames are passed to userspace. | |
120 | */ | |
121 | static int l2tp_ip_recv(struct sk_buff *skb) | |
122 | { | |
123 | struct sock *sk; | |
124 | u32 session_id; | |
125 | u32 tunnel_id; | |
126 | unsigned char *ptr, *optr; | |
127 | struct l2tp_session *session; | |
128 | struct l2tp_tunnel *tunnel = NULL; | |
129 | int length; | |
130 | int offset; | |
131 | ||
132 | /* Point to L2TP header */ | |
133 | optr = ptr = skb->data; | |
134 | ||
135 | if (!pskb_may_pull(skb, 4)) | |
136 | goto discard; | |
137 | ||
138 | session_id = ntohl(*((__be32 *) ptr)); | |
139 | ptr += 4; | |
140 | ||
141 | /* RFC3931: L2TP/IP packets have the first 4 bytes containing | |
142 | * the session_id. If it is 0, the packet is a L2TP control | |
143 | * frame and the session_id value can be discarded. | |
144 | */ | |
145 | if (session_id == 0) { | |
146 | __skb_pull(skb, 4); | |
147 | goto pass_up; | |
148 | } | |
149 | ||
150 | /* Ok, this is a data packet. Lookup the session. */ | |
151 | session = l2tp_session_find(&init_net, NULL, session_id); | |
152 | if (session == NULL) | |
153 | goto discard; | |
154 | ||
155 | tunnel = session->tunnel; | |
156 | if (tunnel == NULL) | |
157 | goto discard; | |
158 | ||
159 | /* Trace packet contents, if enabled */ | |
160 | if (tunnel->debug & L2TP_MSG_DATA) { | |
161 | length = min(32u, skb->len); | |
162 | if (!pskb_may_pull(skb, length)) | |
163 | goto discard; | |
164 | ||
165 | printk(KERN_DEBUG "%s: ip recv: ", tunnel->name); | |
166 | ||
167 | offset = 0; | |
168 | do { | |
169 | printk(" %02X", ptr[offset]); | |
170 | } while (++offset < length); | |
171 | ||
172 | printk("\n"); | |
173 | } | |
174 | ||
175 | l2tp_recv_common(session, skb, ptr, optr, 0, skb->len, tunnel->recv_payload_hook); | |
176 | ||
177 | return 0; | |
178 | ||
179 | pass_up: | |
180 | /* Get the tunnel_id from the L2TP header */ | |
181 | if (!pskb_may_pull(skb, 12)) | |
182 | goto discard; | |
183 | ||
184 | if ((skb->data[0] & 0xc0) != 0xc0) | |
185 | goto discard; | |
186 | ||
187 | tunnel_id = ntohl(*(__be32 *) &skb->data[4]); | |
188 | tunnel = l2tp_tunnel_find(&init_net, tunnel_id); | |
189 | if (tunnel != NULL) | |
190 | sk = tunnel->sock; | |
191 | else { | |
192 | struct iphdr *iph = (struct iphdr *) skb_network_header(skb); | |
193 | ||
194 | read_lock_bh(&l2tp_ip_lock); | |
195 | sk = __l2tp_ip_bind_lookup(&init_net, iph->daddr, 0, tunnel_id); | |
196 | read_unlock_bh(&l2tp_ip_lock); | |
197 | } | |
198 | ||
199 | if (sk == NULL) | |
200 | goto discard; | |
201 | ||
202 | sock_hold(sk); | |
203 | ||
204 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) | |
205 | goto discard_put; | |
206 | ||
207 | nf_reset(skb); | |
208 | ||
209 | return sk_receive_skb(sk, skb, 1); | |
210 | ||
211 | discard_put: | |
212 | sock_put(sk); | |
213 | ||
214 | discard: | |
215 | kfree_skb(skb); | |
216 | return 0; | |
217 | } | |
218 | ||
219 | static int l2tp_ip_open(struct sock *sk) | |
220 | { | |
221 | /* Prevent autobind. We don't have ports. */ | |
222 | inet_sk(sk)->inet_num = IPPROTO_L2TP; | |
223 | ||
224 | write_lock_bh(&l2tp_ip_lock); | |
225 | sk_add_node(sk, &l2tp_ip_table); | |
226 | write_unlock_bh(&l2tp_ip_lock); | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
231 | static void l2tp_ip_close(struct sock *sk, long timeout) | |
232 | { | |
233 | write_lock_bh(&l2tp_ip_lock); | |
234 | hlist_del_init(&sk->sk_bind_node); | |
d1f224ae | 235 | sk_del_node_init(sk); |
0d76751f JC |
236 | write_unlock_bh(&l2tp_ip_lock); |
237 | sk_common_release(sk); | |
238 | } | |
239 | ||
240 | static void l2tp_ip_destroy_sock(struct sock *sk) | |
241 | { | |
242 | struct sk_buff *skb; | |
243 | ||
244 | while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) | |
245 | kfree_skb(skb); | |
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 | int ret = -EINVAL; | |
255 | int chk_addr_ret; | |
256 | ||
257 | ret = -EADDRINUSE; | |
258 | read_lock_bh(&l2tp_ip_lock); | |
259 | if (__l2tp_ip_bind_lookup(&init_net, addr->l2tp_addr.s_addr, sk->sk_bound_dev_if, addr->l2tp_conn_id)) | |
260 | goto out_in_use; | |
261 | ||
262 | read_unlock_bh(&l2tp_ip_lock); | |
263 | ||
264 | lock_sock(sk); | |
265 | if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_l2tpip)) | |
266 | goto out; | |
267 | ||
268 | chk_addr_ret = inet_addr_type(&init_net, addr->l2tp_addr.s_addr); | |
269 | ret = -EADDRNOTAVAIL; | |
270 | if (addr->l2tp_addr.s_addr && chk_addr_ret != RTN_LOCAL && | |
271 | chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) | |
272 | goto out; | |
273 | ||
c9be48dc JC |
274 | if (addr->l2tp_addr.s_addr) |
275 | inet->inet_rcv_saddr = inet->inet_saddr = addr->l2tp_addr.s_addr; | |
0d76751f JC |
276 | if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) |
277 | inet->inet_saddr = 0; /* Use device */ | |
278 | sk_dst_reset(sk); | |
279 | ||
280 | l2tp_ip_sk(sk)->conn_id = addr->l2tp_conn_id; | |
281 | ||
282 | write_lock_bh(&l2tp_ip_lock); | |
283 | sk_add_bind_node(sk, &l2tp_ip_bind_table); | |
284 | sk_del_node_init(sk); | |
285 | write_unlock_bh(&l2tp_ip_lock); | |
286 | ret = 0; | |
287 | out: | |
288 | release_sock(sk); | |
289 | ||
290 | return ret; | |
291 | ||
292 | out_in_use: | |
293 | read_unlock_bh(&l2tp_ip_lock); | |
294 | ||
295 | return ret; | |
296 | } | |
297 | ||
298 | static int l2tp_ip_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) | |
299 | { | |
0d76751f | 300 | struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *) uaddr; |
2d7192d6 | 301 | struct inet_sock *inet = inet_sk(sk); |
de3c7a18 | 302 | int rc; |
0d76751f | 303 | |
0d76751f | 304 | if (addr_len < sizeof(*lsa)) |
de3c7a18 | 305 | return -EINVAL; |
2f16270f | 306 | |
0d76751f | 307 | if (ipv4_is_multicast(lsa->l2tp_addr.s_addr)) |
de3c7a18 | 308 | return -EINVAL; |
0d76751f | 309 | |
de3c7a18 JC |
310 | rc = ip4_datagram_connect(sk, uaddr, addr_len); |
311 | if (rc < 0) | |
312 | return rc; | |
0d76751f | 313 | |
de3c7a18 | 314 | lock_sock(sk); |
0d76751f JC |
315 | |
316 | l2tp_ip_sk(sk)->peer_conn_id = lsa->l2tp_conn_id; | |
317 | ||
0d76751f JC |
318 | write_lock_bh(&l2tp_ip_lock); |
319 | hlist_del_init(&sk->sk_bind_node); | |
320 | sk_add_bind_node(sk, &l2tp_ip_bind_table); | |
321 | write_unlock_bh(&l2tp_ip_lock); | |
322 | ||
2f16270f | 323 | release_sock(sk); |
0d76751f JC |
324 | return rc; |
325 | } | |
326 | ||
327 | static int l2tp_ip_getname(struct socket *sock, struct sockaddr *uaddr, | |
328 | int *uaddr_len, int peer) | |
329 | { | |
330 | struct sock *sk = sock->sk; | |
331 | struct inet_sock *inet = inet_sk(sk); | |
332 | struct l2tp_ip_sock *lsk = l2tp_ip_sk(sk); | |
333 | struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *)uaddr; | |
334 | ||
335 | memset(lsa, 0, sizeof(*lsa)); | |
336 | lsa->l2tp_family = AF_INET; | |
337 | if (peer) { | |
338 | if (!inet->inet_dport) | |
339 | return -ENOTCONN; | |
340 | lsa->l2tp_conn_id = lsk->peer_conn_id; | |
341 | lsa->l2tp_addr.s_addr = inet->inet_daddr; | |
342 | } else { | |
343 | __be32 addr = inet->inet_rcv_saddr; | |
344 | if (!addr) | |
345 | addr = inet->inet_saddr; | |
346 | lsa->l2tp_conn_id = lsk->conn_id; | |
347 | lsa->l2tp_addr.s_addr = addr; | |
348 | } | |
349 | *uaddr_len = sizeof(*lsa); | |
350 | return 0; | |
351 | } | |
352 | ||
353 | static int l2tp_ip_backlog_recv(struct sock *sk, struct sk_buff *skb) | |
354 | { | |
355 | int rc; | |
356 | ||
0d76751f JC |
357 | /* Charge it to the socket, dropping if the queue is full. */ |
358 | rc = sock_queue_rcv_skb(sk, skb); | |
359 | if (rc < 0) | |
360 | goto drop; | |
361 | ||
362 | return 0; | |
363 | ||
364 | drop: | |
365 | IP_INC_STATS(&init_net, IPSTATS_MIB_INDISCARDS); | |
366 | kfree_skb(skb); | |
367 | return -1; | |
368 | } | |
369 | ||
370 | /* Userspace will call sendmsg() on the tunnel socket to send L2TP | |
371 | * control frames. | |
372 | */ | |
373 | static int l2tp_ip_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, size_t len) | |
374 | { | |
375 | struct sk_buff *skb; | |
376 | int rc; | |
377 | struct l2tp_ip_sock *lsa = l2tp_ip_sk(sk); | |
378 | struct inet_sock *inet = inet_sk(sk); | |
0d76751f | 379 | struct rtable *rt = NULL; |
fdbb0f07 | 380 | struct flowi4 *fl4; |
0d76751f JC |
381 | int connected = 0; |
382 | __be32 daddr; | |
383 | ||
2f16270f DM |
384 | lock_sock(sk); |
385 | ||
386 | rc = -ENOTCONN; | |
0d76751f | 387 | if (sock_flag(sk, SOCK_DEAD)) |
2f16270f | 388 | goto out; |
0d76751f JC |
389 | |
390 | /* Get and verify the address. */ | |
391 | if (msg->msg_name) { | |
392 | struct sockaddr_l2tpip *lip = (struct sockaddr_l2tpip *) msg->msg_name; | |
2f16270f | 393 | rc = -EINVAL; |
0d76751f | 394 | if (msg->msg_namelen < sizeof(*lip)) |
2f16270f | 395 | goto out; |
0d76751f JC |
396 | |
397 | if (lip->l2tp_family != AF_INET) { | |
2f16270f | 398 | rc = -EAFNOSUPPORT; |
0d76751f | 399 | if (lip->l2tp_family != AF_UNSPEC) |
2f16270f | 400 | goto out; |
0d76751f JC |
401 | } |
402 | ||
403 | daddr = lip->l2tp_addr.s_addr; | |
404 | } else { | |
405 | if (sk->sk_state != TCP_ESTABLISHED) | |
406 | return -EDESTADDRREQ; | |
407 | ||
408 | daddr = inet->inet_daddr; | |
409 | connected = 1; | |
410 | } | |
411 | ||
412 | /* Allocate a socket buffer */ | |
413 | rc = -ENOMEM; | |
414 | skb = sock_wmalloc(sk, 2 + NET_SKB_PAD + sizeof(struct iphdr) + | |
415 | 4 + len, 0, GFP_KERNEL); | |
416 | if (!skb) | |
417 | goto error; | |
418 | ||
419 | /* Reserve space for headers, putting IP header on 4-byte boundary. */ | |
420 | skb_reserve(skb, 2 + NET_SKB_PAD); | |
421 | skb_reset_network_header(skb); | |
422 | skb_reserve(skb, sizeof(struct iphdr)); | |
423 | skb_reset_transport_header(skb); | |
424 | ||
425 | /* Insert 0 session_id */ | |
426 | *((__be32 *) skb_put(skb, 4)) = 0; | |
427 | ||
428 | /* Copy user data into skb */ | |
429 | rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
430 | if (rc < 0) { | |
431 | kfree_skb(skb); | |
432 | goto error; | |
433 | } | |
434 | ||
fdbb0f07 | 435 | fl4 = &inet->cork.fl.u.ip4; |
0d76751f JC |
436 | if (connected) |
437 | rt = (struct rtable *) __sk_dst_check(sk, 0); | |
438 | ||
081b1b1b | 439 | rcu_read_lock(); |
0d76751f | 440 | if (rt == NULL) { |
081b1b1b | 441 | const struct ip_options_rcu *inet_opt; |
f6d8bd05 | 442 | |
778865a5 | 443 | inet_opt = rcu_dereference(inet->inet_opt); |
f6d8bd05 | 444 | |
0d76751f | 445 | /* Use correct destination address if we have options. */ |
f6d8bd05 ED |
446 | if (inet_opt && inet_opt->opt.srr) |
447 | daddr = inet_opt->opt.faddr; | |
0d76751f | 448 | |
78fbfd8a DM |
449 | /* If this fails, retransmit mechanism of transport layer will |
450 | * keep trying until route appears or the connection times | |
451 | * itself out. | |
452 | */ | |
fdbb0f07 | 453 | rt = ip_route_output_ports(sock_net(sk), fl4, sk, |
78fbfd8a DM |
454 | daddr, inet->inet_saddr, |
455 | inet->inet_dport, inet->inet_sport, | |
456 | sk->sk_protocol, RT_CONN_FLAGS(sk), | |
457 | sk->sk_bound_dev_if); | |
458 | if (IS_ERR(rt)) | |
459 | goto no_route; | |
081b1b1b ED |
460 | if (connected) |
461 | sk_setup_caps(sk, &rt->dst); | |
462 | else | |
463 | dst_release(&rt->dst); /* safe since we hold rcu_read_lock */ | |
0d76751f | 464 | } |
081b1b1b ED |
465 | |
466 | /* We dont need to clone dst here, it is guaranteed to not disappear. | |
467 | * __dev_xmit_skb() might force a refcount if needed. | |
468 | */ | |
469 | skb_dst_set_noref(skb, &rt->dst); | |
0d76751f JC |
470 | |
471 | /* Queue the packet to IP for output */ | |
d9d8da80 | 472 | rc = ip_queue_xmit(skb, &inet->cork.fl); |
081b1b1b | 473 | rcu_read_unlock(); |
0d76751f JC |
474 | |
475 | error: | |
476 | /* Update stats */ | |
477 | if (rc >= 0) { | |
478 | lsa->tx_packets++; | |
479 | lsa->tx_bytes += len; | |
480 | rc = len; | |
481 | } else { | |
482 | lsa->tx_errors++; | |
483 | } | |
484 | ||
2f16270f DM |
485 | out: |
486 | release_sock(sk); | |
0d76751f JC |
487 | return rc; |
488 | ||
489 | no_route: | |
081b1b1b | 490 | rcu_read_unlock(); |
0d76751f JC |
491 | IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES); |
492 | kfree_skb(skb); | |
2f16270f DM |
493 | rc = -EHOSTUNREACH; |
494 | goto out; | |
0d76751f JC |
495 | } |
496 | ||
497 | static int l2tp_ip_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, | |
498 | size_t len, int noblock, int flags, int *addr_len) | |
499 | { | |
500 | struct inet_sock *inet = inet_sk(sk); | |
501 | struct l2tp_ip_sock *lsk = l2tp_ip_sk(sk); | |
502 | size_t copied = 0; | |
503 | int err = -EOPNOTSUPP; | |
504 | struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; | |
505 | struct sk_buff *skb; | |
506 | ||
507 | if (flags & MSG_OOB) | |
508 | goto out; | |
509 | ||
510 | if (addr_len) | |
511 | *addr_len = sizeof(*sin); | |
512 | ||
513 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
514 | if (!skb) | |
515 | goto out; | |
516 | ||
517 | copied = skb->len; | |
518 | if (len < copied) { | |
519 | msg->msg_flags |= MSG_TRUNC; | |
520 | copied = len; | |
521 | } | |
522 | ||
523 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
524 | if (err) | |
525 | goto done; | |
526 | ||
527 | sock_recv_timestamp(msg, sk, skb); | |
528 | ||
529 | /* Copy the address. */ | |
530 | if (sin) { | |
531 | sin->sin_family = AF_INET; | |
532 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; | |
533 | sin->sin_port = 0; | |
534 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
535 | } | |
536 | if (inet->cmsg_flags) | |
537 | ip_cmsg_recv(msg, skb); | |
538 | if (flags & MSG_TRUNC) | |
539 | copied = skb->len; | |
540 | done: | |
541 | skb_free_datagram(sk, skb); | |
542 | out: | |
543 | if (err) { | |
544 | lsk->rx_errors++; | |
545 | return err; | |
546 | } | |
547 | ||
548 | lsk->rx_packets++; | |
549 | lsk->rx_bytes += copied; | |
550 | ||
551 | return copied; | |
552 | } | |
553 | ||
fc130840 | 554 | static struct proto l2tp_ip_prot = { |
0d76751f JC |
555 | .name = "L2TP/IP", |
556 | .owner = THIS_MODULE, | |
557 | .init = l2tp_ip_open, | |
558 | .close = l2tp_ip_close, | |
559 | .bind = l2tp_ip_bind, | |
560 | .connect = l2tp_ip_connect, | |
561 | .disconnect = udp_disconnect, | |
562 | .ioctl = udp_ioctl, | |
563 | .destroy = l2tp_ip_destroy_sock, | |
564 | .setsockopt = ip_setsockopt, | |
565 | .getsockopt = ip_getsockopt, | |
566 | .sendmsg = l2tp_ip_sendmsg, | |
567 | .recvmsg = l2tp_ip_recvmsg, | |
568 | .backlog_rcv = l2tp_ip_backlog_recv, | |
569 | .hash = inet_hash, | |
570 | .unhash = inet_unhash, | |
571 | .obj_size = sizeof(struct l2tp_ip_sock), | |
572 | #ifdef CONFIG_COMPAT | |
573 | .compat_setsockopt = compat_ip_setsockopt, | |
574 | .compat_getsockopt = compat_ip_getsockopt, | |
575 | #endif | |
576 | }; | |
577 | ||
578 | static const struct proto_ops l2tp_ip_ops = { | |
579 | .family = PF_INET, | |
580 | .owner = THIS_MODULE, | |
581 | .release = inet_release, | |
582 | .bind = inet_bind, | |
583 | .connect = inet_dgram_connect, | |
584 | .socketpair = sock_no_socketpair, | |
585 | .accept = sock_no_accept, | |
586 | .getname = l2tp_ip_getname, | |
587 | .poll = datagram_poll, | |
588 | .ioctl = inet_ioctl, | |
589 | .listen = sock_no_listen, | |
590 | .shutdown = inet_shutdown, | |
591 | .setsockopt = sock_common_setsockopt, | |
592 | .getsockopt = sock_common_getsockopt, | |
593 | .sendmsg = inet_sendmsg, | |
594 | .recvmsg = sock_common_recvmsg, | |
595 | .mmap = sock_no_mmap, | |
596 | .sendpage = sock_no_sendpage, | |
597 | #ifdef CONFIG_COMPAT | |
598 | .compat_setsockopt = compat_sock_common_setsockopt, | |
599 | .compat_getsockopt = compat_sock_common_getsockopt, | |
600 | #endif | |
601 | }; | |
602 | ||
603 | static struct inet_protosw l2tp_ip_protosw = { | |
604 | .type = SOCK_DGRAM, | |
605 | .protocol = IPPROTO_L2TP, | |
606 | .prot = &l2tp_ip_prot, | |
607 | .ops = &l2tp_ip_ops, | |
608 | .no_check = 0, | |
609 | }; | |
610 | ||
611 | static struct net_protocol l2tp_ip_protocol __read_mostly = { | |
612 | .handler = l2tp_ip_recv, | |
613 | }; | |
614 | ||
615 | static int __init l2tp_ip_init(void) | |
616 | { | |
617 | int err; | |
618 | ||
619 | printk(KERN_INFO "L2TP IP encapsulation support (L2TPv3)\n"); | |
620 | ||
621 | err = proto_register(&l2tp_ip_prot, 1); | |
622 | if (err != 0) | |
623 | goto out; | |
624 | ||
625 | err = inet_add_protocol(&l2tp_ip_protocol, IPPROTO_L2TP); | |
626 | if (err) | |
627 | goto out1; | |
628 | ||
629 | inet_register_protosw(&l2tp_ip_protosw); | |
630 | return 0; | |
631 | ||
632 | out1: | |
633 | proto_unregister(&l2tp_ip_prot); | |
634 | out: | |
635 | return err; | |
636 | } | |
637 | ||
638 | static void __exit l2tp_ip_exit(void) | |
639 | { | |
640 | inet_unregister_protosw(&l2tp_ip_protosw); | |
641 | inet_del_protocol(&l2tp_ip_protocol, IPPROTO_L2TP); | |
642 | proto_unregister(&l2tp_ip_prot); | |
643 | } | |
644 | ||
645 | module_init(l2tp_ip_init); | |
646 | module_exit(l2tp_ip_exit); | |
647 | ||
648 | MODULE_LICENSE("GPL"); | |
649 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); | |
650 | MODULE_DESCRIPTION("L2TP over IP"); | |
651 | MODULE_VERSION("1.0"); | |
e8d34a88 | 652 | |
e9c54999 | 653 | /* Use the value of SOCK_DGRAM (2) directory, because __stringify doesn't like |
e8d34a88 MM |
654 | * enums |
655 | */ | |
656 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 2, IPPROTO_L2TP); |