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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
20dcb110 | 2 | /* L2TPv3 IP encapsulation support |
0d76751f JC |
3 | * |
4 | * Copyright (c) 2008,2009,2010 Katalix Systems Ltd | |
0d76751f JC |
5 | */ |
6 | ||
a4ca44fa JP |
7 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
8 | ||
72fb96e7 | 9 | #include <asm/ioctls.h> |
0d76751f JC |
10 | #include <linux/icmp.h> |
11 | #include <linux/module.h> | |
12 | #include <linux/skbuff.h> | |
13 | #include <linux/random.h> | |
14 | #include <linux/socket.h> | |
15 | #include <linux/l2tp.h> | |
16 | #include <linux/in.h> | |
17 | #include <net/sock.h> | |
18 | #include <net/ip.h> | |
19 | #include <net/icmp.h> | |
20 | #include <net/udp.h> | |
21 | #include <net/inet_common.h> | |
0d76751f JC |
22 | #include <net/tcp_states.h> |
23 | #include <net/protocol.h> | |
24 | #include <net/xfrm.h> | |
25 | ||
26 | #include "l2tp_core.h" | |
27 | ||
28 | struct l2tp_ip_sock { | |
29 | /* inet_sock has to be the first member of l2tp_ip_sock */ | |
30 | struct inet_sock inet; | |
31 | ||
c8657fd5 JC |
32 | u32 conn_id; |
33 | u32 peer_conn_id; | |
0d76751f JC |
34 | }; |
35 | ||
36 | static DEFINE_RWLOCK(l2tp_ip_lock); | |
37 | static struct hlist_head l2tp_ip_table; | |
38 | static struct hlist_head l2tp_ip_bind_table; | |
39 | ||
40 | static inline struct l2tp_ip_sock *l2tp_ip_sk(const struct sock *sk) | |
41 | { | |
42 | return (struct l2tp_ip_sock *)sk; | |
43 | } | |
44 | ||
a9b2dff8 GN |
45 | static struct sock *__l2tp_ip_bind_lookup(const struct net *net, __be32 laddr, |
46 | __be32 raddr, int dif, u32 tunnel_id) | |
0d76751f | 47 | { |
0d76751f JC |
48 | struct sock *sk; |
49 | ||
b67bfe0d | 50 | sk_for_each_bound(sk, &l2tp_ip_bind_table) { |
bb39b0bd GN |
51 | const struct l2tp_ip_sock *l2tp = l2tp_ip_sk(sk); |
52 | const struct inet_sock *inet = inet_sk(sk); | |
0d76751f | 53 | |
c5fdae04 GN |
54 | if (!net_eq(sock_net(sk), net)) |
55 | continue; | |
56 | ||
57 | if (sk->sk_bound_dev_if && dif && sk->sk_bound_dev_if != dif) | |
58 | continue; | |
59 | ||
60 | if (inet->inet_rcv_saddr && laddr && | |
61 | inet->inet_rcv_saddr != laddr) | |
62 | continue; | |
63 | ||
64 | if (inet->inet_daddr && raddr && inet->inet_daddr != raddr) | |
65 | continue; | |
66 | ||
67 | if (l2tp->conn_id != tunnel_id) | |
68 | continue; | |
69 | ||
70 | goto found; | |
0d76751f JC |
71 | } |
72 | ||
73 | sk = NULL; | |
74 | found: | |
75 | return sk; | |
76 | } | |
77 | ||
0d76751f JC |
78 | /* When processing receive frames, there are two cases to |
79 | * consider. Data frames consist of a non-zero session-id and an | |
80 | * optional cookie. Control frames consist of a regular L2TP header | |
81 | * preceded by 32-bits of zeros. | |
82 | * | |
83 | * L2TPv3 Session Header Over IP | |
84 | * | |
85 | * 0 1 2 3 | |
86 | * 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 | |
87 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
88 | * | Session ID | | |
89 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
90 | * | Cookie (optional, maximum 64 bits)... | |
91 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
92 | * | | |
93 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
94 | * | |
95 | * L2TPv3 Control Message Header Over IP | |
96 | * | |
97 | * 0 1 2 3 | |
98 | * 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 | |
99 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
100 | * | (32 bits of zeros) | | |
101 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
102 | * |T|L|x|x|S|x|x|x|x|x|x|x| Ver | Length | | |
103 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
104 | * | Control Connection ID | | |
105 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
106 | * | Ns | Nr | | |
107 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
108 | * | |
109 | * All control frames are passed to userspace. | |
110 | */ | |
111 | static int l2tp_ip_recv(struct sk_buff *skb) | |
112 | { | |
9d6ddb19 | 113 | struct net *net = dev_net(skb->dev); |
0d76751f JC |
114 | struct sock *sk; |
115 | u32 session_id; | |
116 | u32 tunnel_id; | |
117 | unsigned char *ptr, *optr; | |
118 | struct l2tp_session *session; | |
119 | struct l2tp_tunnel *tunnel = NULL; | |
8f7dc9ae | 120 | struct iphdr *iph; |
0d76751f | 121 | |
0d76751f JC |
122 | if (!pskb_may_pull(skb, 4)) |
123 | goto discard; | |
124 | ||
5745b823 | 125 | /* Point to L2TP header */ |
95075150 TP |
126 | optr = skb->data; |
127 | ptr = skb->data; | |
b71a61cc | 128 | session_id = ntohl(*((__be32 *)ptr)); |
0d76751f JC |
129 | ptr += 4; |
130 | ||
131 | /* RFC3931: L2TP/IP packets have the first 4 bytes containing | |
132 | * the session_id. If it is 0, the packet is a L2TP control | |
133 | * frame and the session_id value can be discarded. | |
134 | */ | |
135 | if (session_id == 0) { | |
136 | __skb_pull(skb, 4); | |
137 | goto pass_up; | |
138 | } | |
139 | ||
140 | /* Ok, this is a data packet. Lookup the session. */ | |
01e28b92 | 141 | session = l2tp_session_get(net, session_id); |
61b9a047 | 142 | if (!session) |
0d76751f JC |
143 | goto discard; |
144 | ||
145 | tunnel = session->tunnel; | |
61b9a047 GN |
146 | if (!tunnel) |
147 | goto discard_sess; | |
0d76751f | 148 | |
4522a70d JW |
149 | if (l2tp_v3_ensure_opt_in_linear(session, skb, &ptr, &optr)) |
150 | goto discard_sess; | |
151 | ||
2b139e6b | 152 | l2tp_recv_common(session, skb, ptr, optr, 0, skb->len); |
61b9a047 | 153 | l2tp_session_dec_refcount(session); |
0d76751f JC |
154 | |
155 | return 0; | |
156 | ||
157 | pass_up: | |
158 | /* Get the tunnel_id from the L2TP header */ | |
159 | if (!pskb_may_pull(skb, 12)) | |
160 | goto discard; | |
161 | ||
162 | if ((skb->data[0] & 0xc0) != 0xc0) | |
163 | goto discard; | |
164 | ||
b71a61cc | 165 | tunnel_id = ntohl(*(__be32 *)&skb->data[4]); |
8f7dc9ae GN |
166 | iph = (struct iphdr *)skb_network_header(skb); |
167 | ||
168 | read_lock_bh(&l2tp_ip_lock); | |
169 | sk = __l2tp_ip_bind_lookup(net, iph->daddr, iph->saddr, inet_iif(skb), | |
170 | tunnel_id); | |
171 | if (!sk) { | |
0d76751f | 172 | read_unlock_bh(&l2tp_ip_lock); |
8f7dc9ae | 173 | goto discard; |
0d76751f | 174 | } |
8f7dc9ae GN |
175 | sock_hold(sk); |
176 | read_unlock_bh(&l2tp_ip_lock); | |
0d76751f | 177 | |
0d76751f JC |
178 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
179 | goto discard_put; | |
180 | ||
895b5c9f | 181 | nf_reset_ct(skb); |
0d76751f JC |
182 | |
183 | return sk_receive_skb(sk, skb, 1); | |
184 | ||
61b9a047 | 185 | discard_sess: |
61b9a047 GN |
186 | l2tp_session_dec_refcount(session); |
187 | goto discard; | |
188 | ||
0d76751f JC |
189 | discard_put: |
190 | sock_put(sk); | |
191 | ||
192 | discard: | |
193 | kfree_skb(skb); | |
194 | return 0; | |
195 | } | |
196 | ||
02c71b14 | 197 | static int l2tp_ip_hash(struct sock *sk) |
0d76751f | 198 | { |
02c71b14 ED |
199 | if (sk_unhashed(sk)) { |
200 | write_lock_bh(&l2tp_ip_lock); | |
201 | sk_add_node(sk, &l2tp_ip_table); | |
202 | write_unlock_bh(&l2tp_ip_lock); | |
203 | } | |
204 | return 0; | |
205 | } | |
0d76751f | 206 | |
02c71b14 ED |
207 | static void l2tp_ip_unhash(struct sock *sk) |
208 | { | |
209 | if (sk_unhashed(sk)) | |
210 | return; | |
0d76751f | 211 | write_lock_bh(&l2tp_ip_lock); |
02c71b14 | 212 | sk_del_node_init(sk); |
0d76751f | 213 | write_unlock_bh(&l2tp_ip_lock); |
02c71b14 ED |
214 | } |
215 | ||
216 | static int l2tp_ip_open(struct sock *sk) | |
217 | { | |
218 | /* Prevent autobind. We don't have ports. */ | |
219 | inet_sk(sk)->inet_num = IPPROTO_L2TP; | |
0d76751f | 220 | |
02c71b14 | 221 | l2tp_ip_hash(sk); |
0d76751f JC |
222 | return 0; |
223 | } | |
224 | ||
225 | static void l2tp_ip_close(struct sock *sk, long timeout) | |
226 | { | |
227 | write_lock_bh(&l2tp_ip_lock); | |
228 | hlist_del_init(&sk->sk_bind_node); | |
d1f224ae | 229 | sk_del_node_init(sk); |
0d76751f JC |
230 | write_unlock_bh(&l2tp_ip_lock); |
231 | sk_common_release(sk); | |
232 | } | |
233 | ||
234 | static void l2tp_ip_destroy_sock(struct sock *sk) | |
235 | { | |
45faeff1 | 236 | struct l2tp_tunnel *tunnel = l2tp_sk_to_tunnel(sk); |
0d76751f JC |
237 | struct sk_buff *skb; |
238 | ||
239 | while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) | |
240 | kfree_skb(skb); | |
241 | ||
d00fa9ad JC |
242 | if (tunnel) |
243 | l2tp_tunnel_delete(tunnel); | |
0d76751f JC |
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); | |
b71a61cc | 249 | struct sockaddr_l2tpip *addr = (struct sockaddr_l2tpip *)uaddr; |
9d6ddb19 | 250 | struct net *net = sock_net(sk); |
c51ce497 | 251 | int ret; |
0d76751f JC |
252 | int chk_addr_ret; |
253 | ||
c51ce497 JC |
254 | if (addr_len < sizeof(struct sockaddr_l2tpip)) |
255 | return -EINVAL; | |
256 | if (addr->l2tp_family != AF_INET) | |
257 | return -EINVAL; | |
258 | ||
0d76751f | 259 | lock_sock(sk); |
d5e3a190 GN |
260 | |
261 | ret = -EINVAL; | |
32c23116 GN |
262 | if (!sock_flag(sk, SOCK_ZAPPED)) |
263 | goto out; | |
264 | ||
8cf2f704 | 265 | if (sk->sk_state != TCP_CLOSE) |
0d76751f JC |
266 | goto out; |
267 | ||
9d6ddb19 | 268 | chk_addr_ret = inet_addr_type(net, addr->l2tp_addr.s_addr); |
0d76751f JC |
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 | ||
95075150 TP |
274 | if (addr->l2tp_addr.s_addr) { |
275 | inet->inet_rcv_saddr = addr->l2tp_addr.s_addr; | |
276 | inet->inet_saddr = addr->l2tp_addr.s_addr; | |
277 | } | |
0d76751f JC |
278 | if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) |
279 | inet->inet_saddr = 0; /* Use device */ | |
0d76751f | 280 | |
d5e3a190 | 281 | write_lock_bh(&l2tp_ip_lock); |
a9b2dff8 | 282 | if (__l2tp_ip_bind_lookup(net, addr->l2tp_addr.s_addr, 0, |
d5e3a190 GN |
283 | sk->sk_bound_dev_if, addr->l2tp_conn_id)) { |
284 | write_unlock_bh(&l2tp_ip_lock); | |
285 | ret = -EADDRINUSE; | |
286 | goto out; | |
287 | } | |
288 | ||
289 | sk_dst_reset(sk); | |
0d76751f JC |
290 | l2tp_ip_sk(sk)->conn_id = addr->l2tp_conn_id; |
291 | ||
0d76751f JC |
292 | sk_add_bind_node(sk, &l2tp_ip_bind_table); |
293 | sk_del_node_init(sk); | |
294 | write_unlock_bh(&l2tp_ip_lock); | |
d5e3a190 | 295 | |
0d76751f | 296 | ret = 0; |
c51ce497 JC |
297 | sock_reset_flag(sk, SOCK_ZAPPED); |
298 | ||
0d76751f JC |
299 | out: |
300 | release_sock(sk); | |
301 | ||
0d76751f JC |
302 | return ret; |
303 | } | |
304 | ||
305 | static int l2tp_ip_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) | |
306 | { | |
b71a61cc | 307 | struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *)uaddr; |
de3c7a18 | 308 | int rc; |
0d76751f | 309 | |
0d76751f | 310 | if (addr_len < sizeof(*lsa)) |
de3c7a18 | 311 | return -EINVAL; |
2f16270f | 312 | |
0d76751f | 313 | if (ipv4_is_multicast(lsa->l2tp_addr.s_addr)) |
de3c7a18 | 314 | return -EINVAL; |
0d76751f | 315 | |
de3c7a18 | 316 | lock_sock(sk); |
0d76751f | 317 | |
0382a25a GN |
318 | /* Must bind first - autobinding does not work */ |
319 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
320 | rc = -EINVAL; | |
321 | goto out_sk; | |
322 | } | |
323 | ||
324 | rc = __ip4_datagram_connect(sk, uaddr, addr_len); | |
325 | if (rc < 0) | |
326 | goto out_sk; | |
327 | ||
0d76751f JC |
328 | l2tp_ip_sk(sk)->peer_conn_id = lsa->l2tp_conn_id; |
329 | ||
0d76751f JC |
330 | write_lock_bh(&l2tp_ip_lock); |
331 | hlist_del_init(&sk->sk_bind_node); | |
332 | sk_add_bind_node(sk, &l2tp_ip_bind_table); | |
333 | write_unlock_bh(&l2tp_ip_lock); | |
334 | ||
0382a25a | 335 | out_sk: |
2f16270f | 336 | release_sock(sk); |
0382a25a | 337 | |
0d76751f JC |
338 | return rc; |
339 | } | |
340 | ||
c51ce497 JC |
341 | static int l2tp_ip_disconnect(struct sock *sk, int flags) |
342 | { | |
343 | if (sock_flag(sk, SOCK_ZAPPED)) | |
344 | return 0; | |
345 | ||
286c72de | 346 | return __udp_disconnect(sk, flags); |
c51ce497 JC |
347 | } |
348 | ||
0d76751f | 349 | static int l2tp_ip_getname(struct socket *sock, struct sockaddr *uaddr, |
9b2c45d4 | 350 | int peer) |
0d76751f JC |
351 | { |
352 | struct sock *sk = sock->sk; | |
353 | struct inet_sock *inet = inet_sk(sk); | |
354 | struct l2tp_ip_sock *lsk = l2tp_ip_sk(sk); | |
355 | struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *)uaddr; | |
356 | ||
357 | memset(lsa, 0, sizeof(*lsa)); | |
358 | lsa->l2tp_family = AF_INET; | |
359 | if (peer) { | |
360 | if (!inet->inet_dport) | |
361 | return -ENOTCONN; | |
362 | lsa->l2tp_conn_id = lsk->peer_conn_id; | |
363 | lsa->l2tp_addr.s_addr = inet->inet_daddr; | |
364 | } else { | |
365 | __be32 addr = inet->inet_rcv_saddr; | |
b71a61cc | 366 | |
0d76751f JC |
367 | if (!addr) |
368 | addr = inet->inet_saddr; | |
369 | lsa->l2tp_conn_id = lsk->conn_id; | |
370 | lsa->l2tp_addr.s_addr = addr; | |
371 | } | |
9b2c45d4 | 372 | return sizeof(*lsa); |
0d76751f JC |
373 | } |
374 | ||
375 | static int l2tp_ip_backlog_recv(struct sock *sk, struct sk_buff *skb) | |
376 | { | |
377 | int rc; | |
378 | ||
0d76751f JC |
379 | /* Charge it to the socket, dropping if the queue is full. */ |
380 | rc = sock_queue_rcv_skb(sk, skb); | |
381 | if (rc < 0) | |
382 | goto drop; | |
383 | ||
384 | return 0; | |
385 | ||
386 | drop: | |
9d6ddb19 | 387 | IP_INC_STATS(sock_net(sk), IPSTATS_MIB_INDISCARDS); |
0d76751f | 388 | kfree_skb(skb); |
51fb60eb | 389 | return 0; |
0d76751f JC |
390 | } |
391 | ||
392 | /* Userspace will call sendmsg() on the tunnel socket to send L2TP | |
393 | * control frames. | |
394 | */ | |
1b784140 | 395 | static int l2tp_ip_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
0d76751f JC |
396 | { |
397 | struct sk_buff *skb; | |
398 | int rc; | |
0d76751f | 399 | struct inet_sock *inet = inet_sk(sk); |
0d76751f | 400 | struct rtable *rt = NULL; |
fdbb0f07 | 401 | struct flowi4 *fl4; |
0d76751f JC |
402 | int connected = 0; |
403 | __be32 daddr; | |
404 | ||
2f16270f DM |
405 | lock_sock(sk); |
406 | ||
407 | rc = -ENOTCONN; | |
0d76751f | 408 | if (sock_flag(sk, SOCK_DEAD)) |
2f16270f | 409 | goto out; |
0d76751f JC |
410 | |
411 | /* Get and verify the address. */ | |
412 | if (msg->msg_name) { | |
342dfc30 | 413 | DECLARE_SOCKADDR(struct sockaddr_l2tpip *, lip, msg->msg_name); |
b71a61cc | 414 | |
2f16270f | 415 | rc = -EINVAL; |
0d76751f | 416 | if (msg->msg_namelen < sizeof(*lip)) |
2f16270f | 417 | goto out; |
0d76751f JC |
418 | |
419 | if (lip->l2tp_family != AF_INET) { | |
2f16270f | 420 | rc = -EAFNOSUPPORT; |
0d76751f | 421 | if (lip->l2tp_family != AF_UNSPEC) |
2f16270f | 422 | goto out; |
0d76751f JC |
423 | } |
424 | ||
425 | daddr = lip->l2tp_addr.s_addr; | |
426 | } else { | |
84768edb | 427 | rc = -EDESTADDRREQ; |
0d76751f | 428 | if (sk->sk_state != TCP_ESTABLISHED) |
84768edb | 429 | goto out; |
0d76751f JC |
430 | |
431 | daddr = inet->inet_daddr; | |
432 | connected = 1; | |
433 | } | |
434 | ||
435 | /* Allocate a socket buffer */ | |
436 | rc = -ENOMEM; | |
437 | skb = sock_wmalloc(sk, 2 + NET_SKB_PAD + sizeof(struct iphdr) + | |
438 | 4 + len, 0, GFP_KERNEL); | |
439 | if (!skb) | |
440 | goto error; | |
441 | ||
442 | /* Reserve space for headers, putting IP header on 4-byte boundary. */ | |
443 | skb_reserve(skb, 2 + NET_SKB_PAD); | |
444 | skb_reset_network_header(skb); | |
445 | skb_reserve(skb, sizeof(struct iphdr)); | |
446 | skb_reset_transport_header(skb); | |
447 | ||
448 | /* Insert 0 session_id */ | |
b71a61cc | 449 | *((__be32 *)skb_put(skb, 4)) = 0; |
0d76751f JC |
450 | |
451 | /* Copy user data into skb */ | |
6ce8e9ce | 452 | rc = memcpy_from_msg(skb_put(skb, len), msg, len); |
0d76751f JC |
453 | if (rc < 0) { |
454 | kfree_skb(skb); | |
455 | goto error; | |
456 | } | |
457 | ||
fdbb0f07 | 458 | fl4 = &inet->cork.fl.u.ip4; |
0d76751f | 459 | if (connected) |
b71a61cc | 460 | rt = (struct rtable *)__sk_dst_check(sk, 0); |
0d76751f | 461 | |
081b1b1b | 462 | rcu_read_lock(); |
0febc7b3 | 463 | if (!rt) { |
081b1b1b | 464 | const struct ip_options_rcu *inet_opt; |
f6d8bd05 | 465 | |
778865a5 | 466 | inet_opt = rcu_dereference(inet->inet_opt); |
f6d8bd05 | 467 | |
0d76751f | 468 | /* Use correct destination address if we have options. */ |
f6d8bd05 ED |
469 | if (inet_opt && inet_opt->opt.srr) |
470 | daddr = inet_opt->opt.faddr; | |
0d76751f | 471 | |
78fbfd8a DM |
472 | /* If this fails, retransmit mechanism of transport layer will |
473 | * keep trying until route appears or the connection times | |
474 | * itself out. | |
475 | */ | |
fdbb0f07 | 476 | rt = ip_route_output_ports(sock_net(sk), fl4, sk, |
78fbfd8a DM |
477 | daddr, inet->inet_saddr, |
478 | inet->inet_dport, inet->inet_sport, | |
479 | sk->sk_protocol, RT_CONN_FLAGS(sk), | |
480 | sk->sk_bound_dev_if); | |
481 | if (IS_ERR(rt)) | |
482 | goto no_route; | |
4399a4df | 483 | if (connected) { |
081b1b1b | 484 | sk_setup_caps(sk, &rt->dst); |
4399a4df ED |
485 | } else { |
486 | skb_dst_set(skb, &rt->dst); | |
487 | goto xmit; | |
488 | } | |
0d76751f | 489 | } |
081b1b1b ED |
490 | |
491 | /* We dont need to clone dst here, it is guaranteed to not disappear. | |
492 | * __dev_xmit_skb() might force a refcount if needed. | |
493 | */ | |
494 | skb_dst_set_noref(skb, &rt->dst); | |
0d76751f | 495 | |
4399a4df | 496 | xmit: |
0d76751f | 497 | /* Queue the packet to IP for output */ |
b0270e91 | 498 | rc = ip_queue_xmit(sk, skb, &inet->cork.fl); |
081b1b1b | 499 | rcu_read_unlock(); |
0d76751f JC |
500 | |
501 | error: | |
c8657fd5 | 502 | if (rc >= 0) |
0d76751f | 503 | rc = len; |
0d76751f | 504 | |
2f16270f DM |
505 | out: |
506 | release_sock(sk); | |
0d76751f JC |
507 | return rc; |
508 | ||
509 | no_route: | |
081b1b1b | 510 | rcu_read_unlock(); |
0d76751f JC |
511 | IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES); |
512 | kfree_skb(skb); | |
2f16270f DM |
513 | rc = -EHOSTUNREACH; |
514 | goto out; | |
0d76751f JC |
515 | } |
516 | ||
1b784140 | 517 | static int l2tp_ip_recvmsg(struct sock *sk, struct msghdr *msg, |
0d76751f JC |
518 | size_t len, int noblock, int flags, int *addr_len) |
519 | { | |
520 | struct inet_sock *inet = inet_sk(sk); | |
0d76751f JC |
521 | size_t copied = 0; |
522 | int err = -EOPNOTSUPP; | |
342dfc30 | 523 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
0d76751f JC |
524 | struct sk_buff *skb; |
525 | ||
526 | if (flags & MSG_OOB) | |
527 | goto out; | |
528 | ||
0d76751f JC |
529 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
530 | if (!skb) | |
531 | goto out; | |
532 | ||
533 | copied = skb->len; | |
534 | if (len < copied) { | |
535 | msg->msg_flags |= MSG_TRUNC; | |
536 | copied = len; | |
537 | } | |
538 | ||
51f3d02b | 539 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
0d76751f JC |
540 | if (err) |
541 | goto done; | |
542 | ||
543 | sock_recv_timestamp(msg, sk, skb); | |
544 | ||
545 | /* Copy the address. */ | |
546 | if (sin) { | |
547 | sin->sin_family = AF_INET; | |
548 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; | |
549 | sin->sin_port = 0; | |
550 | memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
bceaa902 | 551 | *addr_len = sizeof(*sin); |
0d76751f JC |
552 | } |
553 | if (inet->cmsg_flags) | |
554 | ip_cmsg_recv(msg, skb); | |
555 | if (flags & MSG_TRUNC) | |
556 | copied = skb->len; | |
557 | done: | |
558 | skb_free_datagram(sk, skb); | |
559 | out: | |
c8657fd5 | 560 | return err ? err : copied; |
0d76751f JC |
561 | } |
562 | ||
72fb96e7 ED |
563 | int l2tp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
564 | { | |
565 | struct sk_buff *skb; | |
566 | int amount; | |
567 | ||
568 | switch (cmd) { | |
569 | case SIOCOUTQ: | |
570 | amount = sk_wmem_alloc_get(sk); | |
571 | break; | |
572 | case SIOCINQ: | |
573 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
574 | skb = skb_peek(&sk->sk_receive_queue); | |
575 | amount = skb ? skb->len : 0; | |
576 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
577 | break; | |
578 | ||
579 | default: | |
580 | return -ENOIOCTLCMD; | |
581 | } | |
582 | ||
583 | return put_user(amount, (int __user *)arg); | |
584 | } | |
ca7885db | 585 | EXPORT_SYMBOL_GPL(l2tp_ioctl); |
72fb96e7 | 586 | |
fc130840 | 587 | static struct proto l2tp_ip_prot = { |
0d76751f JC |
588 | .name = "L2TP/IP", |
589 | .owner = THIS_MODULE, | |
590 | .init = l2tp_ip_open, | |
591 | .close = l2tp_ip_close, | |
592 | .bind = l2tp_ip_bind, | |
593 | .connect = l2tp_ip_connect, | |
c51ce497 | 594 | .disconnect = l2tp_ip_disconnect, |
72fb96e7 | 595 | .ioctl = l2tp_ioctl, |
0d76751f JC |
596 | .destroy = l2tp_ip_destroy_sock, |
597 | .setsockopt = ip_setsockopt, | |
598 | .getsockopt = ip_getsockopt, | |
599 | .sendmsg = l2tp_ip_sendmsg, | |
600 | .recvmsg = l2tp_ip_recvmsg, | |
601 | .backlog_rcv = l2tp_ip_backlog_recv, | |
02c71b14 ED |
602 | .hash = l2tp_ip_hash, |
603 | .unhash = l2tp_ip_unhash, | |
0d76751f | 604 | .obj_size = sizeof(struct l2tp_ip_sock), |
0d76751f JC |
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, | |
a11e1d43 | 616 | .poll = datagram_poll, |
0d76751f | 617 | .ioctl = inet_ioctl, |
c7cbdbf2 | 618 | .gettstamp = sock_gettstamp, |
0d76751f JC |
619 | .listen = sock_no_listen, |
620 | .shutdown = inet_shutdown, | |
621 | .setsockopt = sock_common_setsockopt, | |
622 | .getsockopt = sock_common_getsockopt, | |
623 | .sendmsg = inet_sendmsg, | |
624 | .recvmsg = sock_common_recvmsg, | |
625 | .mmap = sock_no_mmap, | |
626 | .sendpage = sock_no_sendpage, | |
0d76751f JC |
627 | }; |
628 | ||
629 | static struct inet_protosw l2tp_ip_protosw = { | |
630 | .type = SOCK_DGRAM, | |
631 | .protocol = IPPROTO_L2TP, | |
632 | .prot = &l2tp_ip_prot, | |
633 | .ops = &l2tp_ip_ops, | |
0d76751f JC |
634 | }; |
635 | ||
636 | static struct net_protocol l2tp_ip_protocol __read_mostly = { | |
637 | .handler = l2tp_ip_recv, | |
9d6ddb19 | 638 | .netns_ok = 1, |
0d76751f JC |
639 | }; |
640 | ||
641 | static int __init l2tp_ip_init(void) | |
642 | { | |
643 | int err; | |
644 | ||
a4ca44fa | 645 | pr_info("L2TP IP encapsulation support (L2TPv3)\n"); |
0d76751f JC |
646 | |
647 | err = proto_register(&l2tp_ip_prot, 1); | |
648 | if (err != 0) | |
649 | goto out; | |
650 | ||
651 | err = inet_add_protocol(&l2tp_ip_protocol, IPPROTO_L2TP); | |
652 | if (err) | |
653 | goto out1; | |
654 | ||
655 | inet_register_protosw(&l2tp_ip_protosw); | |
656 | return 0; | |
657 | ||
658 | out1: | |
659 | proto_unregister(&l2tp_ip_prot); | |
660 | out: | |
661 | return err; | |
662 | } | |
663 | ||
664 | static void __exit l2tp_ip_exit(void) | |
665 | { | |
666 | inet_unregister_protosw(&l2tp_ip_protosw); | |
667 | inet_del_protocol(&l2tp_ip_protocol, IPPROTO_L2TP); | |
668 | proto_unregister(&l2tp_ip_prot); | |
669 | } | |
670 | ||
671 | module_init(l2tp_ip_init); | |
672 | module_exit(l2tp_ip_exit); | |
673 | ||
674 | MODULE_LICENSE("GPL"); | |
675 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); | |
676 | MODULE_DESCRIPTION("L2TP over IP"); | |
677 | MODULE_VERSION("1.0"); | |
e8d34a88 | 678 | |
e9c54999 | 679 | /* Use the value of SOCK_DGRAM (2) directory, because __stringify doesn't like |
e8d34a88 MM |
680 | * enums |
681 | */ | |
682 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 2, IPPROTO_L2TP); | |
163c2e25 | 683 | MODULE_ALIAS_NET_PF_PROTO(PF_INET, IPPROTO_L2TP); |