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fd558d18 JC |
1 | /***************************************************************************** |
2 | * Linux PPP over L2TP (PPPoX/PPPoL2TP) Sockets | |
3 | * | |
4 | * PPPoX --- Generic PPP encapsulation socket family | |
5 | * PPPoL2TP --- PPP over L2TP (RFC 2661) | |
6 | * | |
7 | * Version: 2.0.0 | |
8 | * | |
9 | * Authors: James Chapman (jchapman@katalix.com) | |
10 | * | |
11 | * Based on original work by Martijn van Oosterhout <kleptog@svana.org> | |
12 | * | |
13 | * License: | |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | * | |
19 | */ | |
20 | ||
21 | /* This driver handles only L2TP data frames; control frames are handled by a | |
22 | * userspace application. | |
23 | * | |
24 | * To send data in an L2TP session, userspace opens a PPPoL2TP socket and | |
25 | * attaches it to a bound UDP socket with local tunnel_id / session_id and | |
26 | * peer tunnel_id / session_id set. Data can then be sent or received using | |
27 | * regular socket sendmsg() / recvmsg() calls. Kernel parameters of the socket | |
28 | * can be read or modified using ioctl() or [gs]etsockopt() calls. | |
29 | * | |
30 | * When a PPPoL2TP socket is connected with local and peer session_id values | |
31 | * zero, the socket is treated as a special tunnel management socket. | |
32 | * | |
33 | * Here's example userspace code to create a socket for sending/receiving data | |
34 | * over an L2TP session:- | |
35 | * | |
36 | * struct sockaddr_pppol2tp sax; | |
37 | * int fd; | |
38 | * int session_fd; | |
39 | * | |
40 | * fd = socket(AF_PPPOX, SOCK_DGRAM, PX_PROTO_OL2TP); | |
41 | * | |
42 | * sax.sa_family = AF_PPPOX; | |
43 | * sax.sa_protocol = PX_PROTO_OL2TP; | |
44 | * sax.pppol2tp.fd = tunnel_fd; // bound UDP socket | |
45 | * sax.pppol2tp.addr.sin_addr.s_addr = addr->sin_addr.s_addr; | |
46 | * sax.pppol2tp.addr.sin_port = addr->sin_port; | |
47 | * sax.pppol2tp.addr.sin_family = AF_INET; | |
48 | * sax.pppol2tp.s_tunnel = tunnel_id; | |
49 | * sax.pppol2tp.s_session = session_id; | |
50 | * sax.pppol2tp.d_tunnel = peer_tunnel_id; | |
51 | * sax.pppol2tp.d_session = peer_session_id; | |
52 | * | |
53 | * session_fd = connect(fd, (struct sockaddr *)&sax, sizeof(sax)); | |
54 | * | |
55 | * A pppd plugin that allows PPP traffic to be carried over L2TP using | |
56 | * this driver is available from the OpenL2TP project at | |
57 | * http://openl2tp.sourceforge.net. | |
58 | */ | |
59 | ||
a4ca44fa JP |
60 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
61 | ||
fd558d18 JC |
62 | #include <linux/module.h> |
63 | #include <linux/string.h> | |
64 | #include <linux/list.h> | |
65 | #include <linux/uaccess.h> | |
66 | ||
67 | #include <linux/kernel.h> | |
68 | #include <linux/spinlock.h> | |
69 | #include <linux/kthread.h> | |
70 | #include <linux/sched.h> | |
71 | #include <linux/slab.h> | |
72 | #include <linux/errno.h> | |
73 | #include <linux/jiffies.h> | |
74 | ||
75 | #include <linux/netdevice.h> | |
76 | #include <linux/net.h> | |
77 | #include <linux/inetdevice.h> | |
78 | #include <linux/skbuff.h> | |
79 | #include <linux/init.h> | |
80 | #include <linux/ip.h> | |
81 | #include <linux/udp.h> | |
82 | #include <linux/if_pppox.h> | |
83 | #include <linux/if_pppol2tp.h> | |
84 | #include <net/sock.h> | |
85 | #include <linux/ppp_channel.h> | |
86 | #include <linux/ppp_defs.h> | |
4b32da2b | 87 | #include <linux/ppp-ioctl.h> |
fd558d18 JC |
88 | #include <linux/file.h> |
89 | #include <linux/hash.h> | |
90 | #include <linux/sort.h> | |
91 | #include <linux/proc_fs.h> | |
309795f4 | 92 | #include <linux/l2tp.h> |
fd558d18 JC |
93 | #include <linux/nsproxy.h> |
94 | #include <net/net_namespace.h> | |
95 | #include <net/netns/generic.h> | |
96 | #include <net/dst.h> | |
97 | #include <net/ip.h> | |
98 | #include <net/udp.h> | |
99 | #include <net/xfrm.h> | |
cf2f5c88 | 100 | #include <net/inet_common.h> |
fd558d18 JC |
101 | |
102 | #include <asm/byteorder.h> | |
60063497 | 103 | #include <linux/atomic.h> |
fd558d18 JC |
104 | |
105 | #include "l2tp_core.h" | |
106 | ||
107 | #define PPPOL2TP_DRV_VERSION "V2.0" | |
108 | ||
109 | /* Space for UDP, L2TP and PPP headers */ | |
110 | #define PPPOL2TP_HEADER_OVERHEAD 40 | |
111 | ||
fd558d18 JC |
112 | /* Number of bytes to build transmit L2TP headers. |
113 | * Unfortunately the size is different depending on whether sequence numbers | |
114 | * are enabled. | |
115 | */ | |
116 | #define PPPOL2TP_L2TP_HDR_SIZE_SEQ 10 | |
117 | #define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ 6 | |
118 | ||
119 | /* Private data of each session. This data lives at the end of struct | |
120 | * l2tp_session, referenced via session->priv[]. | |
121 | */ | |
122 | struct pppol2tp_session { | |
123 | int owner; /* pid that opened the socket */ | |
124 | ||
ee40fb2e GN |
125 | struct mutex sk_lock; /* Protects .sk */ |
126 | struct sock __rcu *sk; /* Pointer to the session | |
fd558d18 | 127 | * PPPoX socket */ |
ee40fb2e GN |
128 | struct sock *__sk; /* Copy of .sk, for cleanup */ |
129 | struct rcu_head rcu; /* For asynchronous release */ | |
fd558d18 JC |
130 | int flags; /* accessed by PPPIOCGFLAGS. |
131 | * Unused. */ | |
132 | }; | |
133 | ||
134 | static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb); | |
135 | ||
d7100da0 | 136 | static const struct ppp_channel_ops pppol2tp_chan_ops = { |
137 | .start_xmit = pppol2tp_xmit, | |
138 | }; | |
139 | ||
fd558d18 JC |
140 | static const struct proto_ops pppol2tp_ops; |
141 | ||
ee40fb2e GN |
142 | /* Retrieves the pppol2tp socket associated to a session. |
143 | * A reference is held on the returned socket, so this function must be paired | |
144 | * with sock_put(). | |
145 | */ | |
146 | static struct sock *pppol2tp_session_get_sock(struct l2tp_session *session) | |
147 | { | |
148 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
149 | struct sock *sk; | |
150 | ||
151 | rcu_read_lock(); | |
152 | sk = rcu_dereference(ps->sk); | |
153 | if (sk) | |
154 | sock_hold(sk); | |
155 | rcu_read_unlock(); | |
156 | ||
157 | return sk; | |
158 | } | |
159 | ||
fd558d18 JC |
160 | /* Helpers to obtain tunnel/session contexts from sockets. |
161 | */ | |
162 | static inline struct l2tp_session *pppol2tp_sock_to_session(struct sock *sk) | |
163 | { | |
164 | struct l2tp_session *session; | |
165 | ||
166 | if (sk == NULL) | |
167 | return NULL; | |
168 | ||
169 | sock_hold(sk); | |
170 | session = (struct l2tp_session *)(sk->sk_user_data); | |
171 | if (session == NULL) { | |
172 | sock_put(sk); | |
173 | goto out; | |
174 | } | |
175 | ||
176 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
177 | ||
178 | out: | |
179 | return session; | |
180 | } | |
181 | ||
182 | /***************************************************************************** | |
183 | * Receive data handling | |
184 | *****************************************************************************/ | |
185 | ||
186 | static int pppol2tp_recv_payload_hook(struct sk_buff *skb) | |
187 | { | |
188 | /* Skip PPP header, if present. In testing, Microsoft L2TP clients | |
189 | * don't send the PPP header (PPP header compression enabled), but | |
190 | * other clients can include the header. So we cope with both cases | |
191 | * here. The PPP header is always FF03 when using L2TP. | |
192 | * | |
193 | * Note that skb->data[] isn't dereferenced from a u16 ptr here since | |
194 | * the field may be unaligned. | |
195 | */ | |
196 | if (!pskb_may_pull(skb, 2)) | |
197 | return 1; | |
198 | ||
54c151d9 | 199 | if ((skb->data[0] == PPP_ALLSTATIONS) && (skb->data[1] == PPP_UI)) |
fd558d18 JC |
200 | skb_pull(skb, 2); |
201 | ||
202 | return 0; | |
203 | } | |
204 | ||
205 | /* Receive message. This is the recvmsg for the PPPoL2TP socket. | |
206 | */ | |
1b784140 YX |
207 | static int pppol2tp_recvmsg(struct socket *sock, struct msghdr *msg, |
208 | size_t len, int flags) | |
fd558d18 JC |
209 | { |
210 | int err; | |
211 | struct sk_buff *skb; | |
212 | struct sock *sk = sock->sk; | |
213 | ||
214 | err = -EIO; | |
215 | if (sk->sk_state & PPPOX_BOUND) | |
216 | goto end; | |
217 | ||
fd558d18 JC |
218 | err = 0; |
219 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
220 | flags & MSG_DONTWAIT, &err); | |
221 | if (!skb) | |
222 | goto end; | |
223 | ||
224 | if (len > skb->len) | |
225 | len = skb->len; | |
226 | else if (len < skb->len) | |
227 | msg->msg_flags |= MSG_TRUNC; | |
228 | ||
51f3d02b | 229 | err = skb_copy_datagram_msg(skb, 0, msg, len); |
fd558d18 JC |
230 | if (likely(err == 0)) |
231 | err = len; | |
232 | ||
233 | kfree_skb(skb); | |
234 | end: | |
235 | return err; | |
236 | } | |
237 | ||
238 | static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len) | |
239 | { | |
240 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
241 | struct sock *sk = NULL; | |
242 | ||
243 | /* If the socket is bound, send it in to PPP's input queue. Otherwise | |
244 | * queue it on the session socket. | |
245 | */ | |
ee40fb2e GN |
246 | rcu_read_lock(); |
247 | sk = rcu_dereference(ps->sk); | |
fd558d18 JC |
248 | if (sk == NULL) |
249 | goto no_sock; | |
250 | ||
251 | if (sk->sk_state & PPPOX_BOUND) { | |
252 | struct pppox_sock *po; | |
98f40b3e | 253 | |
fba40c63 | 254 | l2tp_dbg(session, L2TP_MSG_DATA, |
a4ca44fa JP |
255 | "%s: recv %d byte data frame, passing to ppp\n", |
256 | session->name, data_len); | |
fd558d18 | 257 | |
fd558d18 JC |
258 | po = pppox_sk(sk); |
259 | ppp_input(&po->chan, skb); | |
260 | } else { | |
fba40c63 | 261 | l2tp_dbg(session, L2TP_MSG_DATA, |
9e9cb622 GN |
262 | "%s: recv %d byte data frame, passing to L2TP socket\n", |
263 | session->name, data_len); | |
fd558d18 | 264 | |
9e9cb622 GN |
265 | if (sock_queue_rcv_skb(sk, skb) < 0) { |
266 | atomic_long_inc(&session->stats.rx_errors); | |
267 | kfree_skb(skb); | |
268 | } | |
fd558d18 | 269 | } |
ee40fb2e | 270 | rcu_read_unlock(); |
fd558d18 JC |
271 | |
272 | return; | |
273 | ||
274 | no_sock: | |
ee40fb2e | 275 | rcu_read_unlock(); |
fba40c63 | 276 | l2tp_info(session, L2TP_MSG_DATA, "%s: no socket\n", session->name); |
fd558d18 JC |
277 | kfree_skb(skb); |
278 | } | |
279 | ||
fd558d18 JC |
280 | /************************************************************************ |
281 | * Transmit handling | |
282 | ***********************************************************************/ | |
283 | ||
fd558d18 JC |
284 | /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here |
285 | * when a user application does a sendmsg() on the session socket. L2TP and | |
286 | * PPP headers must be inserted into the user's data. | |
287 | */ | |
1b784140 | 288 | static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m, |
fd558d18 JC |
289 | size_t total_len) |
290 | { | |
fd558d18 JC |
291 | struct sock *sk = sock->sk; |
292 | struct sk_buff *skb; | |
293 | int error; | |
294 | struct l2tp_session *session; | |
295 | struct l2tp_tunnel *tunnel; | |
0d76751f | 296 | int uhlen; |
fd558d18 JC |
297 | |
298 | error = -ENOTCONN; | |
299 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
300 | goto error; | |
301 | ||
302 | /* Get session and tunnel contexts */ | |
303 | error = -EBADF; | |
304 | session = pppol2tp_sock_to_session(sk); | |
305 | if (session == NULL) | |
306 | goto error; | |
307 | ||
7198c77a | 308 | tunnel = session->tunnel; |
fd558d18 | 309 | |
0d76751f JC |
310 | uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0; |
311 | ||
fd558d18 JC |
312 | /* Allocate a socket buffer */ |
313 | error = -ENOMEM; | |
314 | skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) + | |
0d76751f | 315 | uhlen + session->hdr_len + |
54c151d9 | 316 | 2 + total_len, /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */ |
fd558d18 JC |
317 | 0, GFP_KERNEL); |
318 | if (!skb) | |
7198c77a | 319 | goto error_put_sess; |
fd558d18 JC |
320 | |
321 | /* Reserve space for headers. */ | |
322 | skb_reserve(skb, NET_SKB_PAD); | |
323 | skb_reset_network_header(skb); | |
324 | skb_reserve(skb, sizeof(struct iphdr)); | |
325 | skb_reset_transport_header(skb); | |
0d76751f | 326 | skb_reserve(skb, uhlen); |
fd558d18 JC |
327 | |
328 | /* Add PPP header */ | |
54c151d9 GF |
329 | skb->data[0] = PPP_ALLSTATIONS; |
330 | skb->data[1] = PPP_UI; | |
fd558d18 JC |
331 | skb_put(skb, 2); |
332 | ||
333 | /* Copy user data into skb */ | |
6ce8e9ce | 334 | error = memcpy_from_msg(skb_put(skb, total_len), m, total_len); |
fd558d18 JC |
335 | if (error < 0) { |
336 | kfree_skb(skb); | |
7198c77a | 337 | goto error_put_sess; |
fd558d18 | 338 | } |
fd558d18 | 339 | |
455cc32b | 340 | local_bh_disable(); |
fd558d18 | 341 | l2tp_xmit_skb(session, skb, session->hdr_len); |
455cc32b | 342 | local_bh_enable(); |
fd558d18 | 343 | |
8b82547e | 344 | sock_put(sk); |
fd558d18 | 345 | |
a6f79d0f | 346 | return total_len; |
fd558d18 | 347 | |
fd558d18 JC |
348 | error_put_sess: |
349 | sock_put(sk); | |
350 | error: | |
351 | return error; | |
352 | } | |
353 | ||
354 | /* Transmit function called by generic PPP driver. Sends PPP frame | |
355 | * over PPPoL2TP socket. | |
356 | * | |
357 | * This is almost the same as pppol2tp_sendmsg(), but rather than | |
358 | * being called with a msghdr from userspace, it is called with a skb | |
359 | * from the kernel. | |
360 | * | |
361 | * The supplied skb from ppp doesn't have enough headroom for the | |
362 | * insertion of L2TP, UDP and IP headers so we need to allocate more | |
363 | * headroom in the skb. This will create a cloned skb. But we must be | |
364 | * careful in the error case because the caller will expect to free | |
365 | * the skb it supplied, not our cloned skb. So we take care to always | |
366 | * leave the original skb unfreed if we return an error. | |
367 | */ | |
368 | static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb) | |
369 | { | |
fd558d18 | 370 | struct sock *sk = (struct sock *) chan->private; |
fd558d18 JC |
371 | struct l2tp_session *session; |
372 | struct l2tp_tunnel *tunnel; | |
09df57ca | 373 | int uhlen, headroom; |
fd558d18 JC |
374 | |
375 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
376 | goto abort; | |
377 | ||
378 | /* Get session and tunnel contexts from the socket */ | |
379 | session = pppol2tp_sock_to_session(sk); | |
380 | if (session == NULL) | |
381 | goto abort; | |
382 | ||
7198c77a | 383 | tunnel = session->tunnel; |
fd558d18 | 384 | |
09df57ca ED |
385 | uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0; |
386 | headroom = NET_SKB_PAD + | |
387 | sizeof(struct iphdr) + /* IP header */ | |
388 | uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */ | |
389 | session->hdr_len + /* L2TP header */ | |
54c151d9 | 390 | 2; /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */ |
09df57ca | 391 | if (skb_cow_head(skb, headroom)) |
7198c77a | 392 | goto abort_put_sess; |
fd558d18 | 393 | |
fd558d18 | 394 | /* Setup PPP header */ |
54c151d9 GF |
395 | __skb_push(skb, 2); |
396 | skb->data[0] = PPP_ALLSTATIONS; | |
397 | skb->data[1] = PPP_UI; | |
fd558d18 | 398 | |
455cc32b | 399 | local_bh_disable(); |
e0d4435f | 400 | l2tp_xmit_skb(session, skb, session->hdr_len); |
455cc32b | 401 | local_bh_enable(); |
fd558d18 | 402 | |
fd558d18 | 403 | sock_put(sk); |
7198c77a | 404 | |
fd558d18 JC |
405 | return 1; |
406 | ||
fd558d18 JC |
407 | abort_put_sess: |
408 | sock_put(sk); | |
409 | abort: | |
410 | /* Free the original skb */ | |
411 | kfree_skb(skb); | |
412 | return 1; | |
413 | } | |
414 | ||
415 | /***************************************************************************** | |
416 | * Session (and tunnel control) socket create/destroy. | |
417 | *****************************************************************************/ | |
418 | ||
41e4f44a JC |
419 | static void pppol2tp_put_sk(struct rcu_head *head) |
420 | { | |
421 | struct pppol2tp_session *ps; | |
422 | ||
423 | ps = container_of(head, typeof(*ps), rcu); | |
424 | sock_put(ps->__sk); | |
425 | } | |
426 | ||
fd558d18 JC |
427 | /* Called by l2tp_core when a session socket is being closed. |
428 | */ | |
429 | static void pppol2tp_session_close(struct l2tp_session *session) | |
430 | { | |
41e4f44a JC |
431 | struct pppol2tp_session *ps; |
432 | ||
433 | ps = l2tp_session_priv(session); | |
434 | mutex_lock(&ps->sk_lock); | |
435 | ps->__sk = rcu_dereference_protected(ps->sk, | |
436 | lockdep_is_held(&ps->sk_lock)); | |
437 | RCU_INIT_POINTER(ps->sk, NULL); | |
438 | if (ps->__sk) | |
439 | call_rcu(&ps->rcu, pppol2tp_put_sk); | |
440 | mutex_unlock(&ps->sk_lock); | |
fd558d18 JC |
441 | } |
442 | ||
443 | /* Really kill the session socket. (Called from sock_put() if | |
444 | * refcnt == 0.) | |
445 | */ | |
446 | static void pppol2tp_session_destruct(struct sock *sk) | |
447 | { | |
f6e16b29 | 448 | struct l2tp_session *session = sk->sk_user_data; |
e91793bb GN |
449 | |
450 | skb_queue_purge(&sk->sk_receive_queue); | |
451 | skb_queue_purge(&sk->sk_write_queue); | |
452 | ||
f6e16b29 | 453 | if (session) { |
fd558d18 JC |
454 | sk->sk_user_data = NULL; |
455 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
456 | l2tp_session_dec_refcount(session); | |
457 | } | |
fd558d18 JC |
458 | } |
459 | ||
460 | /* Called when the PPPoX socket (session) is closed. | |
461 | */ | |
462 | static int pppol2tp_release(struct socket *sock) | |
463 | { | |
464 | struct sock *sk = sock->sk; | |
465 | struct l2tp_session *session; | |
466 | int error; | |
467 | ||
468 | if (!sk) | |
469 | return 0; | |
470 | ||
471 | error = -EBADF; | |
472 | lock_sock(sk); | |
473 | if (sock_flag(sk, SOCK_DEAD) != 0) | |
474 | goto error; | |
475 | ||
476 | pppox_unbind_sock(sk); | |
477 | ||
478 | /* Signal the death of the socket. */ | |
479 | sk->sk_state = PPPOX_DEAD; | |
480 | sock_orphan(sk); | |
481 | sock->sk = NULL; | |
482 | ||
41e4f44a JC |
483 | /* If the socket is associated with a session, |
484 | * l2tp_session_delete will call pppol2tp_session_close which | |
485 | * will drop the session's ref on the socket. | |
486 | */ | |
fd558d18 | 487 | session = pppol2tp_sock_to_session(sk); |
41e4f44a | 488 | if (session) { |
f98be6c6 | 489 | l2tp_session_delete(session); |
41e4f44a JC |
490 | /* drop the ref obtained by pppol2tp_sock_to_session */ |
491 | sock_put(sk); | |
fd558d18 | 492 | } |
41e4f44a | 493 | |
fd558d18 JC |
494 | release_sock(sk); |
495 | ||
496 | /* This will delete the session context via | |
497 | * pppol2tp_session_destruct() if the socket's refcnt drops to | |
498 | * zero. | |
499 | */ | |
500 | sock_put(sk); | |
501 | ||
502 | return 0; | |
503 | ||
504 | error: | |
505 | release_sock(sk); | |
506 | return error; | |
507 | } | |
508 | ||
509 | static struct proto pppol2tp_sk_proto = { | |
510 | .name = "PPPOL2TP", | |
511 | .owner = THIS_MODULE, | |
512 | .obj_size = sizeof(struct pppox_sock), | |
513 | }; | |
514 | ||
515 | static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb) | |
516 | { | |
517 | int rc; | |
518 | ||
519 | rc = l2tp_udp_encap_recv(sk, skb); | |
520 | if (rc) | |
521 | kfree_skb(skb); | |
522 | ||
523 | return NET_RX_SUCCESS; | |
524 | } | |
525 | ||
526 | /* socket() handler. Initialize a new struct sock. | |
527 | */ | |
11aa9c28 | 528 | static int pppol2tp_create(struct net *net, struct socket *sock, int kern) |
fd558d18 JC |
529 | { |
530 | int error = -ENOMEM; | |
531 | struct sock *sk; | |
532 | ||
11aa9c28 | 533 | sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto, kern); |
fd558d18 JC |
534 | if (!sk) |
535 | goto out; | |
536 | ||
537 | sock_init_data(sock, sk); | |
538 | ||
539 | sock->state = SS_UNCONNECTED; | |
540 | sock->ops = &pppol2tp_ops; | |
541 | ||
542 | sk->sk_backlog_rcv = pppol2tp_backlog_recv; | |
543 | sk->sk_protocol = PX_PROTO_OL2TP; | |
544 | sk->sk_family = PF_PPPOX; | |
545 | sk->sk_state = PPPOX_NONE; | |
546 | sk->sk_type = SOCK_STREAM; | |
547 | sk->sk_destruct = pppol2tp_session_destruct; | |
548 | ||
549 | error = 0; | |
550 | ||
551 | out: | |
552 | return error; | |
553 | } | |
554 | ||
9dd79945 | 555 | #if IS_ENABLED(CONFIG_L2TP_DEBUGFS) |
0ad66140 JC |
556 | static void pppol2tp_show(struct seq_file *m, void *arg) |
557 | { | |
558 | struct l2tp_session *session = arg; | |
ee40fb2e GN |
559 | struct sock *sk; |
560 | ||
561 | sk = pppol2tp_session_get_sock(session); | |
562 | if (sk) { | |
563 | struct pppox_sock *po = pppox_sk(sk); | |
0ad66140 | 564 | |
ee40fb2e GN |
565 | seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan)); |
566 | sock_put(sk); | |
0ad66140 JC |
567 | } |
568 | } | |
569 | #endif | |
570 | ||
f98be6c6 GN |
571 | static void pppol2tp_session_init(struct l2tp_session *session) |
572 | { | |
573 | struct pppol2tp_session *ps; | |
574 | struct dst_entry *dst; | |
575 | ||
576 | session->recv_skb = pppol2tp_recv; | |
577 | session->session_close = pppol2tp_session_close; | |
578 | #if IS_ENABLED(CONFIG_L2TP_DEBUGFS) | |
579 | session->show = pppol2tp_show; | |
580 | #endif | |
581 | ||
582 | ps = l2tp_session_priv(session); | |
583 | mutex_init(&ps->sk_lock); | |
f98be6c6 GN |
584 | ps->owner = current->pid; |
585 | ||
586 | /* If PMTU discovery was enabled, use the MTU that was discovered */ | |
587 | dst = sk_dst_get(session->tunnel->sock); | |
588 | if (dst) { | |
589 | u32 pmtu = dst_mtu(dst); | |
590 | ||
591 | if (pmtu) { | |
592 | session->mtu = pmtu - PPPOL2TP_HEADER_OVERHEAD; | |
593 | session->mru = pmtu - PPPOL2TP_HEADER_OVERHEAD; | |
594 | } | |
595 | dst_release(dst); | |
596 | } | |
597 | } | |
598 | ||
fd558d18 JC |
599 | /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket |
600 | */ | |
601 | static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr, | |
602 | int sockaddr_len, int flags) | |
603 | { | |
604 | struct sock *sk = sock->sk; | |
605 | struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr; | |
606 | struct pppox_sock *po = pppox_sk(sk); | |
607 | struct l2tp_session *session = NULL; | |
608 | struct l2tp_tunnel *tunnel; | |
609 | struct pppol2tp_session *ps; | |
fd558d18 JC |
610 | struct l2tp_session_cfg cfg = { 0, }; |
611 | int error = 0; | |
e0d4435f JC |
612 | u32 tunnel_id, peer_tunnel_id; |
613 | u32 session_id, peer_session_id; | |
dbdbc73b | 614 | bool drop_refcnt = false; |
f9e56baf | 615 | bool drop_tunnel = false; |
e0d4435f JC |
616 | int ver = 2; |
617 | int fd; | |
fd558d18 JC |
618 | |
619 | lock_sock(sk); | |
620 | ||
621 | error = -EINVAL; | |
509313e4 GN |
622 | |
623 | if (sockaddr_len != sizeof(struct sockaddr_pppol2tp) && | |
624 | sockaddr_len != sizeof(struct sockaddr_pppol2tpv3) && | |
625 | sockaddr_len != sizeof(struct sockaddr_pppol2tpin6) && | |
626 | sockaddr_len != sizeof(struct sockaddr_pppol2tpv3in6)) | |
627 | goto end; | |
628 | ||
fd558d18 JC |
629 | if (sp->sa_protocol != PX_PROTO_OL2TP) |
630 | goto end; | |
631 | ||
632 | /* Check for already bound sockets */ | |
633 | error = -EBUSY; | |
634 | if (sk->sk_state & PPPOX_CONNECTED) | |
635 | goto end; | |
636 | ||
637 | /* We don't supporting rebinding anyway */ | |
638 | error = -EALREADY; | |
639 | if (sk->sk_user_data) | |
640 | goto end; /* socket is already attached */ | |
641 | ||
b79585f5 JC |
642 | /* Get params from socket address. Handle L2TPv2 and L2TPv3. |
643 | * This is nasty because there are different sockaddr_pppol2tp | |
644 | * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use | |
645 | * the sockaddr size to determine which structure the caller | |
646 | * is using. | |
647 | */ | |
648 | peer_tunnel_id = 0; | |
e0d4435f JC |
649 | if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) { |
650 | fd = sp->pppol2tp.fd; | |
651 | tunnel_id = sp->pppol2tp.s_tunnel; | |
652 | peer_tunnel_id = sp->pppol2tp.d_tunnel; | |
653 | session_id = sp->pppol2tp.s_session; | |
654 | peer_session_id = sp->pppol2tp.d_session; | |
655 | } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) { | |
b79585f5 JC |
656 | struct sockaddr_pppol2tpv3 *sp3 = |
657 | (struct sockaddr_pppol2tpv3 *) sp; | |
e0d4435f JC |
658 | ver = 3; |
659 | fd = sp3->pppol2tp.fd; | |
660 | tunnel_id = sp3->pppol2tp.s_tunnel; | |
661 | peer_tunnel_id = sp3->pppol2tp.d_tunnel; | |
662 | session_id = sp3->pppol2tp.s_session; | |
663 | peer_session_id = sp3->pppol2tp.d_session; | |
b79585f5 JC |
664 | } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpin6)) { |
665 | struct sockaddr_pppol2tpin6 *sp6 = | |
666 | (struct sockaddr_pppol2tpin6 *) sp; | |
667 | fd = sp6->pppol2tp.fd; | |
668 | tunnel_id = sp6->pppol2tp.s_tunnel; | |
669 | peer_tunnel_id = sp6->pppol2tp.d_tunnel; | |
670 | session_id = sp6->pppol2tp.s_session; | |
671 | peer_session_id = sp6->pppol2tp.d_session; | |
672 | } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3in6)) { | |
673 | struct sockaddr_pppol2tpv3in6 *sp6 = | |
674 | (struct sockaddr_pppol2tpv3in6 *) sp; | |
675 | ver = 3; | |
676 | fd = sp6->pppol2tp.fd; | |
677 | tunnel_id = sp6->pppol2tp.s_tunnel; | |
678 | peer_tunnel_id = sp6->pppol2tp.d_tunnel; | |
679 | session_id = sp6->pppol2tp.s_session; | |
680 | peer_session_id = sp6->pppol2tp.d_session; | |
e0d4435f JC |
681 | } else { |
682 | error = -EINVAL; | |
683 | goto end; /* bad socket address */ | |
684 | } | |
685 | ||
686 | /* Don't bind if tunnel_id is 0 */ | |
fd558d18 | 687 | error = -EINVAL; |
e0d4435f | 688 | if (tunnel_id == 0) |
fd558d18 JC |
689 | goto end; |
690 | ||
f9e56baf GN |
691 | tunnel = l2tp_tunnel_get(sock_net(sk), tunnel_id); |
692 | if (tunnel) | |
693 | drop_tunnel = true; | |
309795f4 | 694 | |
e0d4435f JC |
695 | /* Special case: create tunnel context if session_id and |
696 | * peer_session_id is 0. Otherwise look up tunnel using supplied | |
fd558d18 JC |
697 | * tunnel id. |
698 | */ | |
e0d4435f | 699 | if ((session_id == 0) && (peer_session_id == 0)) { |
309795f4 JC |
700 | if (tunnel == NULL) { |
701 | struct l2tp_tunnel_cfg tcfg = { | |
702 | .encap = L2TP_ENCAPTYPE_UDP, | |
703 | .debug = 0, | |
704 | }; | |
705 | error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel); | |
706 | if (error < 0) | |
707 | goto end; | |
98aa4345 GN |
708 | |
709 | l2tp_tunnel_inc_refcount(tunnel); | |
710 | error = l2tp_tunnel_register(tunnel, sock_net(sk), | |
711 | &tcfg); | |
712 | if (error < 0) { | |
713 | kfree(tunnel); | |
714 | goto end; | |
715 | } | |
716 | drop_tunnel = true; | |
309795f4 | 717 | } |
fd558d18 | 718 | } else { |
fd558d18 JC |
719 | /* Error if we can't find the tunnel */ |
720 | error = -ENOENT; | |
721 | if (tunnel == NULL) | |
722 | goto end; | |
723 | ||
724 | /* Error if socket is not prepped */ | |
725 | if (tunnel->sock == NULL) | |
726 | goto end; | |
727 | } | |
728 | ||
729 | if (tunnel->recv_payload_hook == NULL) | |
730 | tunnel->recv_payload_hook = pppol2tp_recv_payload_hook; | |
731 | ||
b79585f5 JC |
732 | if (tunnel->peer_tunnel_id == 0) |
733 | tunnel->peer_tunnel_id = peer_tunnel_id; | |
fd558d18 | 734 | |
a4346210 | 735 | session = l2tp_session_get(sock_net(sk), tunnel, session_id); |
dbdbc73b GN |
736 | if (session) { |
737 | drop_refcnt = true; | |
738 | ps = l2tp_session_priv(session); | |
739 | ||
740 | /* Using a pre-existing session is fine as long as it hasn't | |
741 | * been connected yet. | |
309795f4 | 742 | */ |
ee40fb2e GN |
743 | mutex_lock(&ps->sk_lock); |
744 | if (rcu_dereference_protected(ps->sk, | |
745 | lockdep_is_held(&ps->sk_lock))) { | |
746 | mutex_unlock(&ps->sk_lock); | |
dbdbc73b GN |
747 | error = -EEXIST; |
748 | goto end; | |
749 | } | |
309795f4 | 750 | } else { |
dbdbc73b GN |
751 | /* Default MTU must allow space for UDP/L2TP/PPP headers */ |
752 | cfg.mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD; | |
753 | cfg.mru = cfg.mtu; | |
309795f4 | 754 | |
dbdbc73b GN |
755 | session = l2tp_session_create(sizeof(struct pppol2tp_session), |
756 | tunnel, session_id, | |
757 | peer_session_id, &cfg); | |
758 | if (IS_ERR(session)) { | |
759 | error = PTR_ERR(session); | |
309795f4 | 760 | goto end; |
dbdbc73b | 761 | } |
3953ae7b | 762 | |
f98be6c6 | 763 | pppol2tp_session_init(session); |
ee40fb2e | 764 | ps = l2tp_session_priv(session); |
3953ae7b | 765 | l2tp_session_inc_refcount(session); |
ee40fb2e GN |
766 | |
767 | mutex_lock(&ps->sk_lock); | |
3953ae7b GN |
768 | error = l2tp_session_register(session, tunnel); |
769 | if (error < 0) { | |
ee40fb2e | 770 | mutex_unlock(&ps->sk_lock); |
3953ae7b GN |
771 | kfree(session); |
772 | goto end; | |
773 | } | |
774 | drop_refcnt = true; | |
fd558d18 JC |
775 | } |
776 | ||
fd558d18 JC |
777 | /* Special case: if source & dest session_id == 0x0000, this |
778 | * socket is being created to manage the tunnel. Just set up | |
779 | * the internal context for use by ioctl() and sockopt() | |
780 | * handlers. | |
781 | */ | |
782 | if ((session->session_id == 0) && | |
783 | (session->peer_session_id == 0)) { | |
784 | error = 0; | |
785 | goto out_no_ppp; | |
786 | } | |
787 | ||
788 | /* The only header we need to worry about is the L2TP | |
789 | * header. This size is different depending on whether | |
790 | * sequence numbers are enabled for the data channel. | |
791 | */ | |
792 | po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
793 | ||
794 | po->chan.private = sk; | |
795 | po->chan.ops = &pppol2tp_chan_ops; | |
796 | po->chan.mtu = session->mtu; | |
797 | ||
798 | error = ppp_register_net_channel(sock_net(sk), &po->chan); | |
ee40fb2e GN |
799 | if (error) { |
800 | mutex_unlock(&ps->sk_lock); | |
fd558d18 | 801 | goto end; |
ee40fb2e | 802 | } |
fd558d18 JC |
803 | |
804 | out_no_ppp: | |
805 | /* This is how we get the session context from the socket. */ | |
41e4f44a | 806 | sock_hold(sk); |
fd558d18 | 807 | sk->sk_user_data = session; |
ee40fb2e GN |
808 | rcu_assign_pointer(ps->sk, sk); |
809 | mutex_unlock(&ps->sk_lock); | |
810 | ||
f98be6c6 GN |
811 | /* Keep the reference we've grabbed on the session: sk doesn't expect |
812 | * the session to disappear. pppol2tp_session_destruct() is responsible | |
813 | * for dropping it. | |
814 | */ | |
815 | drop_refcnt = false; | |
816 | ||
fd558d18 | 817 | sk->sk_state = PPPOX_CONNECTED; |
fba40c63 | 818 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: created\n", |
a4ca44fa | 819 | session->name); |
fd558d18 JC |
820 | |
821 | end: | |
dbdbc73b GN |
822 | if (drop_refcnt) |
823 | l2tp_session_dec_refcount(session); | |
f9e56baf GN |
824 | if (drop_tunnel) |
825 | l2tp_tunnel_dec_refcount(tunnel); | |
fd558d18 JC |
826 | release_sock(sk); |
827 | ||
828 | return error; | |
829 | } | |
830 | ||
309795f4 JC |
831 | #ifdef CONFIG_L2TP_V3 |
832 | ||
f026bc29 GN |
833 | /* Called when creating sessions via the netlink interface. */ |
834 | static int pppol2tp_session_create(struct net *net, struct l2tp_tunnel *tunnel, | |
835 | u32 session_id, u32 peer_session_id, | |
836 | struct l2tp_session_cfg *cfg) | |
309795f4 JC |
837 | { |
838 | int error; | |
309795f4 | 839 | struct l2tp_session *session; |
309795f4 | 840 | |
309795f4 | 841 | /* Error if tunnel socket is not prepped */ |
f026bc29 GN |
842 | if (!tunnel->sock) { |
843 | error = -ENOENT; | |
3953ae7b | 844 | goto err; |
f026bc29 | 845 | } |
309795f4 | 846 | |
309795f4 JC |
847 | /* Default MTU values. */ |
848 | if (cfg->mtu == 0) | |
849 | cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD; | |
850 | if (cfg->mru == 0) | |
851 | cfg->mru = cfg->mtu; | |
852 | ||
853 | /* Allocate and initialize a new session context. */ | |
309795f4 JC |
854 | session = l2tp_session_create(sizeof(struct pppol2tp_session), |
855 | tunnel, session_id, | |
856 | peer_session_id, cfg); | |
dbdbc73b GN |
857 | if (IS_ERR(session)) { |
858 | error = PTR_ERR(session); | |
3953ae7b | 859 | goto err; |
dbdbc73b | 860 | } |
309795f4 | 861 | |
f98be6c6 | 862 | pppol2tp_session_init(session); |
309795f4 | 863 | |
3953ae7b GN |
864 | error = l2tp_session_register(session, tunnel); |
865 | if (error < 0) | |
866 | goto err_sess; | |
309795f4 | 867 | |
3953ae7b | 868 | return 0; |
309795f4 | 869 | |
3953ae7b GN |
870 | err_sess: |
871 | kfree(session); | |
872 | err: | |
309795f4 JC |
873 | return error; |
874 | } | |
875 | ||
309795f4 JC |
876 | #endif /* CONFIG_L2TP_V3 */ |
877 | ||
fd558d18 JC |
878 | /* getname() support. |
879 | */ | |
880 | static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr, | |
881 | int *usockaddr_len, int peer) | |
882 | { | |
e0d4435f | 883 | int len = 0; |
fd558d18 JC |
884 | int error = 0; |
885 | struct l2tp_session *session; | |
886 | struct l2tp_tunnel *tunnel; | |
887 | struct sock *sk = sock->sk; | |
888 | struct inet_sock *inet; | |
889 | struct pppol2tp_session *pls; | |
890 | ||
891 | error = -ENOTCONN; | |
892 | if (sk == NULL) | |
893 | goto end; | |
56cff471 | 894 | if (!(sk->sk_state & PPPOX_CONNECTED)) |
fd558d18 JC |
895 | goto end; |
896 | ||
897 | error = -EBADF; | |
898 | session = pppol2tp_sock_to_session(sk); | |
899 | if (session == NULL) | |
900 | goto end; | |
901 | ||
902 | pls = l2tp_session_priv(session); | |
7198c77a | 903 | tunnel = session->tunnel; |
fd558d18 | 904 | |
bbdb32cb | 905 | inet = inet_sk(tunnel->sock); |
d2cf3361 | 906 | if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) { |
e0d4435f JC |
907 | struct sockaddr_pppol2tp sp; |
908 | len = sizeof(sp); | |
909 | memset(&sp, 0, len); | |
910 | sp.sa_family = AF_PPPOX; | |
911 | sp.sa_protocol = PX_PROTO_OL2TP; | |
912 | sp.pppol2tp.fd = tunnel->fd; | |
913 | sp.pppol2tp.pid = pls->owner; | |
914 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
915 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
916 | sp.pppol2tp.s_session = session->session_id; | |
917 | sp.pppol2tp.d_session = session->peer_session_id; | |
918 | sp.pppol2tp.addr.sin_family = AF_INET; | |
919 | sp.pppol2tp.addr.sin_port = inet->inet_dport; | |
920 | sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr; | |
921 | memcpy(uaddr, &sp, len); | |
d2cf3361 BL |
922 | #if IS_ENABLED(CONFIG_IPV6) |
923 | } else if ((tunnel->version == 2) && | |
924 | (tunnel->sock->sk_family == AF_INET6)) { | |
d2cf3361 | 925 | struct sockaddr_pppol2tpin6 sp; |
efe4208f | 926 | |
d2cf3361 BL |
927 | len = sizeof(sp); |
928 | memset(&sp, 0, len); | |
929 | sp.sa_family = AF_PPPOX; | |
930 | sp.sa_protocol = PX_PROTO_OL2TP; | |
931 | sp.pppol2tp.fd = tunnel->fd; | |
932 | sp.pppol2tp.pid = pls->owner; | |
933 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
934 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
935 | sp.pppol2tp.s_session = session->session_id; | |
936 | sp.pppol2tp.d_session = session->peer_session_id; | |
937 | sp.pppol2tp.addr.sin6_family = AF_INET6; | |
938 | sp.pppol2tp.addr.sin6_port = inet->inet_dport; | |
efe4208f ED |
939 | memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr, |
940 | sizeof(tunnel->sock->sk_v6_daddr)); | |
d2cf3361 BL |
941 | memcpy(uaddr, &sp, len); |
942 | } else if ((tunnel->version == 3) && | |
943 | (tunnel->sock->sk_family == AF_INET6)) { | |
d2cf3361 | 944 | struct sockaddr_pppol2tpv3in6 sp; |
efe4208f | 945 | |
d2cf3361 BL |
946 | len = sizeof(sp); |
947 | memset(&sp, 0, len); | |
948 | sp.sa_family = AF_PPPOX; | |
949 | sp.sa_protocol = PX_PROTO_OL2TP; | |
950 | sp.pppol2tp.fd = tunnel->fd; | |
951 | sp.pppol2tp.pid = pls->owner; | |
952 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
953 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
954 | sp.pppol2tp.s_session = session->session_id; | |
955 | sp.pppol2tp.d_session = session->peer_session_id; | |
956 | sp.pppol2tp.addr.sin6_family = AF_INET6; | |
957 | sp.pppol2tp.addr.sin6_port = inet->inet_dport; | |
efe4208f ED |
958 | memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr, |
959 | sizeof(tunnel->sock->sk_v6_daddr)); | |
d2cf3361 BL |
960 | memcpy(uaddr, &sp, len); |
961 | #endif | |
e0d4435f JC |
962 | } else if (tunnel->version == 3) { |
963 | struct sockaddr_pppol2tpv3 sp; | |
964 | len = sizeof(sp); | |
965 | memset(&sp, 0, len); | |
966 | sp.sa_family = AF_PPPOX; | |
967 | sp.sa_protocol = PX_PROTO_OL2TP; | |
968 | sp.pppol2tp.fd = tunnel->fd; | |
969 | sp.pppol2tp.pid = pls->owner; | |
970 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
971 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
972 | sp.pppol2tp.s_session = session->session_id; | |
973 | sp.pppol2tp.d_session = session->peer_session_id; | |
974 | sp.pppol2tp.addr.sin_family = AF_INET; | |
975 | sp.pppol2tp.addr.sin_port = inet->inet_dport; | |
976 | sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr; | |
977 | memcpy(uaddr, &sp, len); | |
978 | } | |
fd558d18 JC |
979 | |
980 | *usockaddr_len = len; | |
4ac36a4a | 981 | error = 0; |
fd558d18 | 982 | |
fd558d18 | 983 | sock_put(sk); |
fd558d18 JC |
984 | end: |
985 | return error; | |
986 | } | |
987 | ||
988 | /**************************************************************************** | |
989 | * ioctl() handlers. | |
990 | * | |
991 | * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP | |
992 | * sockets. However, in order to control kernel tunnel features, we allow | |
993 | * userspace to create a special "tunnel" PPPoX socket which is used for | |
994 | * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow | |
995 | * the user application to issue L2TP setsockopt(), getsockopt() and ioctl() | |
996 | * calls. | |
997 | ****************************************************************************/ | |
998 | ||
999 | static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest, | |
1000 | struct l2tp_stats *stats) | |
1001 | { | |
7b7c0719 TP |
1002 | dest->tx_packets = atomic_long_read(&stats->tx_packets); |
1003 | dest->tx_bytes = atomic_long_read(&stats->tx_bytes); | |
1004 | dest->tx_errors = atomic_long_read(&stats->tx_errors); | |
1005 | dest->rx_packets = atomic_long_read(&stats->rx_packets); | |
1006 | dest->rx_bytes = atomic_long_read(&stats->rx_bytes); | |
1007 | dest->rx_seq_discards = atomic_long_read(&stats->rx_seq_discards); | |
1008 | dest->rx_oos_packets = atomic_long_read(&stats->rx_oos_packets); | |
1009 | dest->rx_errors = atomic_long_read(&stats->rx_errors); | |
fd558d18 JC |
1010 | } |
1011 | ||
1012 | /* Session ioctl helper. | |
1013 | */ | |
1014 | static int pppol2tp_session_ioctl(struct l2tp_session *session, | |
1015 | unsigned int cmd, unsigned long arg) | |
1016 | { | |
1017 | struct ifreq ifr; | |
1018 | int err = 0; | |
1019 | struct sock *sk; | |
1020 | int val = (int) arg; | |
1021 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
1022 | struct l2tp_tunnel *tunnel = session->tunnel; | |
1023 | struct pppol2tp_ioc_stats stats; | |
1024 | ||
fba40c63 | 1025 | l2tp_dbg(session, L2TP_MSG_CONTROL, |
a4ca44fa JP |
1026 | "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n", |
1027 | session->name, cmd, arg); | |
fd558d18 | 1028 | |
ee40fb2e | 1029 | sk = pppol2tp_session_get_sock(session); |
5903f594 GN |
1030 | if (!sk) |
1031 | return -EBADR; | |
1032 | ||
fd558d18 JC |
1033 | switch (cmd) { |
1034 | case SIOCGIFMTU: | |
1035 | err = -ENXIO; | |
1036 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1037 | break; | |
1038 | ||
1039 | err = -EFAULT; | |
1040 | if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq))) | |
1041 | break; | |
1042 | ifr.ifr_mtu = session->mtu; | |
1043 | if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq))) | |
1044 | break; | |
1045 | ||
fba40c63 | 1046 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mtu=%d\n", |
a4ca44fa | 1047 | session->name, session->mtu); |
fd558d18 JC |
1048 | err = 0; |
1049 | break; | |
1050 | ||
1051 | case SIOCSIFMTU: | |
1052 | err = -ENXIO; | |
1053 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1054 | break; | |
1055 | ||
1056 | err = -EFAULT; | |
1057 | if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq))) | |
1058 | break; | |
1059 | ||
1060 | session->mtu = ifr.ifr_mtu; | |
1061 | ||
fba40c63 | 1062 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mtu=%d\n", |
a4ca44fa | 1063 | session->name, session->mtu); |
fd558d18 JC |
1064 | err = 0; |
1065 | break; | |
1066 | ||
1067 | case PPPIOCGMRU: | |
1068 | err = -ENXIO; | |
1069 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1070 | break; | |
1071 | ||
1072 | err = -EFAULT; | |
1073 | if (put_user(session->mru, (int __user *) arg)) | |
1074 | break; | |
1075 | ||
fba40c63 | 1076 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mru=%d\n", |
a4ca44fa | 1077 | session->name, session->mru); |
fd558d18 JC |
1078 | err = 0; |
1079 | break; | |
1080 | ||
1081 | case PPPIOCSMRU: | |
1082 | err = -ENXIO; | |
1083 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1084 | break; | |
1085 | ||
1086 | err = -EFAULT; | |
1087 | if (get_user(val, (int __user *) arg)) | |
1088 | break; | |
1089 | ||
1090 | session->mru = val; | |
fba40c63 | 1091 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mru=%d\n", |
a4ca44fa | 1092 | session->name, session->mru); |
fd558d18 JC |
1093 | err = 0; |
1094 | break; | |
1095 | ||
1096 | case PPPIOCGFLAGS: | |
1097 | err = -EFAULT; | |
1098 | if (put_user(ps->flags, (int __user *) arg)) | |
1099 | break; | |
1100 | ||
fba40c63 | 1101 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: get flags=%d\n", |
a4ca44fa | 1102 | session->name, ps->flags); |
fd558d18 JC |
1103 | err = 0; |
1104 | break; | |
1105 | ||
1106 | case PPPIOCSFLAGS: | |
1107 | err = -EFAULT; | |
1108 | if (get_user(val, (int __user *) arg)) | |
1109 | break; | |
1110 | ps->flags = val; | |
fba40c63 | 1111 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: set flags=%d\n", |
a4ca44fa | 1112 | session->name, ps->flags); |
fd558d18 JC |
1113 | err = 0; |
1114 | break; | |
1115 | ||
1116 | case PPPIOCGL2TPSTATS: | |
1117 | err = -ENXIO; | |
1118 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1119 | break; | |
1120 | ||
1121 | memset(&stats, 0, sizeof(stats)); | |
1122 | stats.tunnel_id = tunnel->tunnel_id; | |
1123 | stats.session_id = session->session_id; | |
1124 | pppol2tp_copy_stats(&stats, &session->stats); | |
1125 | if (copy_to_user((void __user *) arg, &stats, | |
1126 | sizeof(stats))) | |
1127 | break; | |
fba40c63 | 1128 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: get L2TP stats\n", |
a4ca44fa | 1129 | session->name); |
fd558d18 JC |
1130 | err = 0; |
1131 | break; | |
1132 | ||
1133 | default: | |
1134 | err = -ENOSYS; | |
1135 | break; | |
1136 | } | |
1137 | ||
1138 | sock_put(sk); | |
1139 | ||
1140 | return err; | |
1141 | } | |
1142 | ||
1143 | /* Tunnel ioctl helper. | |
1144 | * | |
1145 | * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data | |
1146 | * specifies a session_id, the session ioctl handler is called. This allows an | |
1147 | * application to retrieve session stats via a tunnel socket. | |
1148 | */ | |
1149 | static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel, | |
1150 | unsigned int cmd, unsigned long arg) | |
1151 | { | |
1152 | int err = 0; | |
1153 | struct sock *sk; | |
1154 | struct pppol2tp_ioc_stats stats; | |
1155 | ||
fba40c63 | 1156 | l2tp_dbg(tunnel, L2TP_MSG_CONTROL, |
a4ca44fa JP |
1157 | "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n", |
1158 | tunnel->name, cmd, arg); | |
fd558d18 JC |
1159 | |
1160 | sk = tunnel->sock; | |
1161 | sock_hold(sk); | |
1162 | ||
1163 | switch (cmd) { | |
1164 | case PPPIOCGL2TPSTATS: | |
1165 | err = -ENXIO; | |
1166 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1167 | break; | |
1168 | ||
1169 | if (copy_from_user(&stats, (void __user *) arg, | |
1170 | sizeof(stats))) { | |
1171 | err = -EFAULT; | |
1172 | break; | |
1173 | } | |
1174 | if (stats.session_id != 0) { | |
1175 | /* resend to session ioctl handler */ | |
1176 | struct l2tp_session *session = | |
57377d63 | 1177 | l2tp_session_get(sock_net(sk), tunnel, |
a4346210 | 1178 | stats.session_id); |
57377d63 GN |
1179 | |
1180 | if (session) { | |
1181 | err = pppol2tp_session_ioctl(session, cmd, | |
1182 | arg); | |
57377d63 GN |
1183 | l2tp_session_dec_refcount(session); |
1184 | } else { | |
fd558d18 | 1185 | err = -EBADR; |
57377d63 | 1186 | } |
fd558d18 JC |
1187 | break; |
1188 | } | |
1189 | #ifdef CONFIG_XFRM | |
1190 | stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0; | |
1191 | #endif | |
1192 | pppol2tp_copy_stats(&stats, &tunnel->stats); | |
1193 | if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) { | |
1194 | err = -EFAULT; | |
1195 | break; | |
1196 | } | |
fba40c63 | 1197 | l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get L2TP stats\n", |
a4ca44fa | 1198 | tunnel->name); |
fd558d18 JC |
1199 | err = 0; |
1200 | break; | |
1201 | ||
1202 | default: | |
1203 | err = -ENOSYS; | |
1204 | break; | |
1205 | } | |
1206 | ||
1207 | sock_put(sk); | |
1208 | ||
1209 | return err; | |
1210 | } | |
1211 | ||
1212 | /* Main ioctl() handler. | |
1213 | * Dispatch to tunnel or session helpers depending on the socket. | |
1214 | */ | |
1215 | static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd, | |
1216 | unsigned long arg) | |
1217 | { | |
1218 | struct sock *sk = sock->sk; | |
1219 | struct l2tp_session *session; | |
1220 | struct l2tp_tunnel *tunnel; | |
fd558d18 JC |
1221 | int err; |
1222 | ||
1223 | if (!sk) | |
1224 | return 0; | |
1225 | ||
1226 | err = -EBADF; | |
1227 | if (sock_flag(sk, SOCK_DEAD) != 0) | |
1228 | goto end; | |
1229 | ||
1230 | err = -ENOTCONN; | |
1231 | if ((sk->sk_user_data == NULL) || | |
1232 | (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)))) | |
1233 | goto end; | |
1234 | ||
1235 | /* Get session context from the socket */ | |
1236 | err = -EBADF; | |
1237 | session = pppol2tp_sock_to_session(sk); | |
1238 | if (session == NULL) | |
1239 | goto end; | |
1240 | ||
1241 | /* Special case: if session's session_id is zero, treat ioctl as a | |
1242 | * tunnel ioctl | |
1243 | */ | |
fd558d18 JC |
1244 | if ((session->session_id == 0) && |
1245 | (session->peer_session_id == 0)) { | |
7198c77a | 1246 | tunnel = session->tunnel; |
fd558d18 | 1247 | err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg); |
fd558d18 JC |
1248 | goto end_put_sess; |
1249 | } | |
1250 | ||
1251 | err = pppol2tp_session_ioctl(session, cmd, arg); | |
1252 | ||
1253 | end_put_sess: | |
1254 | sock_put(sk); | |
1255 | end: | |
1256 | return err; | |
1257 | } | |
1258 | ||
1259 | /***************************************************************************** | |
1260 | * setsockopt() / getsockopt() support. | |
1261 | * | |
1262 | * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP | |
1263 | * sockets. In order to control kernel tunnel features, we allow userspace to | |
1264 | * create a special "tunnel" PPPoX socket which is used for control only. | |
1265 | * Tunnel PPPoX sockets have session_id == 0 and simply allow the user | |
1266 | * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls. | |
1267 | *****************************************************************************/ | |
1268 | ||
1269 | /* Tunnel setsockopt() helper. | |
1270 | */ | |
1271 | static int pppol2tp_tunnel_setsockopt(struct sock *sk, | |
1272 | struct l2tp_tunnel *tunnel, | |
1273 | int optname, int val) | |
1274 | { | |
1275 | int err = 0; | |
1276 | ||
1277 | switch (optname) { | |
1278 | case PPPOL2TP_SO_DEBUG: | |
1279 | tunnel->debug = val; | |
fba40c63 | 1280 | l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: set debug=%x\n", |
a4ca44fa | 1281 | tunnel->name, tunnel->debug); |
fd558d18 JC |
1282 | break; |
1283 | ||
1284 | default: | |
1285 | err = -ENOPROTOOPT; | |
1286 | break; | |
1287 | } | |
1288 | ||
1289 | return err; | |
1290 | } | |
1291 | ||
1292 | /* Session setsockopt helper. | |
1293 | */ | |
1294 | static int pppol2tp_session_setsockopt(struct sock *sk, | |
1295 | struct l2tp_session *session, | |
1296 | int optname, int val) | |
1297 | { | |
1298 | int err = 0; | |
fd558d18 JC |
1299 | |
1300 | switch (optname) { | |
1301 | case PPPOL2TP_SO_RECVSEQ: | |
1302 | if ((val != 0) && (val != 1)) { | |
1303 | err = -EINVAL; | |
1304 | break; | |
1305 | } | |
3f9b9770 | 1306 | session->recv_seq = !!val; |
fba40c63 | 1307 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa JP |
1308 | "%s: set recv_seq=%d\n", |
1309 | session->name, session->recv_seq); | |
fd558d18 JC |
1310 | break; |
1311 | ||
1312 | case PPPOL2TP_SO_SENDSEQ: | |
1313 | if ((val != 0) && (val != 1)) { | |
1314 | err = -EINVAL; | |
1315 | break; | |
1316 | } | |
3f9b9770 | 1317 | session->send_seq = !!val; |
fd558d18 | 1318 | { |
ee40fb2e GN |
1319 | struct pppox_sock *po = pppox_sk(sk); |
1320 | ||
fd558d18 JC |
1321 | po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ : |
1322 | PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
1323 | } | |
bb5016ea | 1324 | l2tp_session_set_header_len(session, session->tunnel->version); |
fba40c63 | 1325 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa JP |
1326 | "%s: set send_seq=%d\n", |
1327 | session->name, session->send_seq); | |
fd558d18 JC |
1328 | break; |
1329 | ||
1330 | case PPPOL2TP_SO_LNSMODE: | |
1331 | if ((val != 0) && (val != 1)) { | |
1332 | err = -EINVAL; | |
1333 | break; | |
1334 | } | |
3f9b9770 | 1335 | session->lns_mode = !!val; |
fba40c63 | 1336 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa JP |
1337 | "%s: set lns_mode=%d\n", |
1338 | session->name, session->lns_mode); | |
fd558d18 JC |
1339 | break; |
1340 | ||
1341 | case PPPOL2TP_SO_DEBUG: | |
1342 | session->debug = val; | |
fba40c63 | 1343 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: set debug=%x\n", |
a4ca44fa | 1344 | session->name, session->debug); |
fd558d18 JC |
1345 | break; |
1346 | ||
1347 | case PPPOL2TP_SO_REORDERTO: | |
1348 | session->reorder_timeout = msecs_to_jiffies(val); | |
fba40c63 | 1349 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa JP |
1350 | "%s: set reorder_timeout=%d\n", |
1351 | session->name, session->reorder_timeout); | |
fd558d18 JC |
1352 | break; |
1353 | ||
1354 | default: | |
1355 | err = -ENOPROTOOPT; | |
1356 | break; | |
1357 | } | |
1358 | ||
1359 | return err; | |
1360 | } | |
1361 | ||
1362 | /* Main setsockopt() entry point. | |
1363 | * Does API checks, then calls either the tunnel or session setsockopt | |
1364 | * handler, according to whether the PPPoL2TP socket is a for a regular | |
1365 | * session or the special tunnel type. | |
1366 | */ | |
1367 | static int pppol2tp_setsockopt(struct socket *sock, int level, int optname, | |
1368 | char __user *optval, unsigned int optlen) | |
1369 | { | |
1370 | struct sock *sk = sock->sk; | |
1371 | struct l2tp_session *session; | |
1372 | struct l2tp_tunnel *tunnel; | |
fd558d18 JC |
1373 | int val; |
1374 | int err; | |
1375 | ||
1376 | if (level != SOL_PPPOL2TP) | |
3cf521f7 | 1377 | return -EINVAL; |
fd558d18 JC |
1378 | |
1379 | if (optlen < sizeof(int)) | |
1380 | return -EINVAL; | |
1381 | ||
1382 | if (get_user(val, (int __user *)optval)) | |
1383 | return -EFAULT; | |
1384 | ||
1385 | err = -ENOTCONN; | |
1386 | if (sk->sk_user_data == NULL) | |
1387 | goto end; | |
1388 | ||
1389 | /* Get session context from the socket */ | |
1390 | err = -EBADF; | |
1391 | session = pppol2tp_sock_to_session(sk); | |
1392 | if (session == NULL) | |
1393 | goto end; | |
1394 | ||
1395 | /* Special case: if session_id == 0x0000, treat as operation on tunnel | |
1396 | */ | |
fd558d18 JC |
1397 | if ((session->session_id == 0) && |
1398 | (session->peer_session_id == 0)) { | |
7198c77a | 1399 | tunnel = session->tunnel; |
fd558d18 | 1400 | err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val); |
7198c77a | 1401 | } else { |
fd558d18 | 1402 | err = pppol2tp_session_setsockopt(sk, session, optname, val); |
7198c77a | 1403 | } |
fd558d18 | 1404 | |
fd558d18 JC |
1405 | sock_put(sk); |
1406 | end: | |
1407 | return err; | |
1408 | } | |
1409 | ||
1410 | /* Tunnel getsockopt helper. Called with sock locked. | |
1411 | */ | |
1412 | static int pppol2tp_tunnel_getsockopt(struct sock *sk, | |
1413 | struct l2tp_tunnel *tunnel, | |
1414 | int optname, int *val) | |
1415 | { | |
1416 | int err = 0; | |
1417 | ||
1418 | switch (optname) { | |
1419 | case PPPOL2TP_SO_DEBUG: | |
1420 | *val = tunnel->debug; | |
fba40c63 | 1421 | l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get debug=%x\n", |
a4ca44fa | 1422 | tunnel->name, tunnel->debug); |
fd558d18 JC |
1423 | break; |
1424 | ||
1425 | default: | |
1426 | err = -ENOPROTOOPT; | |
1427 | break; | |
1428 | } | |
1429 | ||
1430 | return err; | |
1431 | } | |
1432 | ||
1433 | /* Session getsockopt helper. Called with sock locked. | |
1434 | */ | |
1435 | static int pppol2tp_session_getsockopt(struct sock *sk, | |
1436 | struct l2tp_session *session, | |
1437 | int optname, int *val) | |
1438 | { | |
1439 | int err = 0; | |
1440 | ||
1441 | switch (optname) { | |
1442 | case PPPOL2TP_SO_RECVSEQ: | |
1443 | *val = session->recv_seq; | |
fba40c63 | 1444 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa | 1445 | "%s: get recv_seq=%d\n", session->name, *val); |
fd558d18 JC |
1446 | break; |
1447 | ||
1448 | case PPPOL2TP_SO_SENDSEQ: | |
1449 | *val = session->send_seq; | |
fba40c63 | 1450 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa | 1451 | "%s: get send_seq=%d\n", session->name, *val); |
fd558d18 JC |
1452 | break; |
1453 | ||
1454 | case PPPOL2TP_SO_LNSMODE: | |
1455 | *val = session->lns_mode; | |
fba40c63 | 1456 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa | 1457 | "%s: get lns_mode=%d\n", session->name, *val); |
fd558d18 JC |
1458 | break; |
1459 | ||
1460 | case PPPOL2TP_SO_DEBUG: | |
1461 | *val = session->debug; | |
fba40c63 | 1462 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: get debug=%d\n", |
a4ca44fa | 1463 | session->name, *val); |
fd558d18 JC |
1464 | break; |
1465 | ||
1466 | case PPPOL2TP_SO_REORDERTO: | |
1467 | *val = (int) jiffies_to_msecs(session->reorder_timeout); | |
fba40c63 | 1468 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa | 1469 | "%s: get reorder_timeout=%d\n", session->name, *val); |
fd558d18 JC |
1470 | break; |
1471 | ||
1472 | default: | |
1473 | err = -ENOPROTOOPT; | |
1474 | } | |
1475 | ||
1476 | return err; | |
1477 | } | |
1478 | ||
1479 | /* Main getsockopt() entry point. | |
1480 | * Does API checks, then calls either the tunnel or session getsockopt | |
1481 | * handler, according to whether the PPPoX socket is a for a regular session | |
1482 | * or the special tunnel type. | |
1483 | */ | |
e3192690 JP |
1484 | static int pppol2tp_getsockopt(struct socket *sock, int level, int optname, |
1485 | char __user *optval, int __user *optlen) | |
fd558d18 JC |
1486 | { |
1487 | struct sock *sk = sock->sk; | |
1488 | struct l2tp_session *session; | |
1489 | struct l2tp_tunnel *tunnel; | |
1490 | int val, len; | |
1491 | int err; | |
fd558d18 JC |
1492 | |
1493 | if (level != SOL_PPPOL2TP) | |
3cf521f7 | 1494 | return -EINVAL; |
fd558d18 | 1495 | |
e3192690 | 1496 | if (get_user(len, optlen)) |
fd558d18 JC |
1497 | return -EFAULT; |
1498 | ||
1499 | len = min_t(unsigned int, len, sizeof(int)); | |
1500 | ||
1501 | if (len < 0) | |
1502 | return -EINVAL; | |
1503 | ||
1504 | err = -ENOTCONN; | |
1505 | if (sk->sk_user_data == NULL) | |
1506 | goto end; | |
1507 | ||
1508 | /* Get the session context */ | |
1509 | err = -EBADF; | |
1510 | session = pppol2tp_sock_to_session(sk); | |
1511 | if (session == NULL) | |
1512 | goto end; | |
1513 | ||
1514 | /* Special case: if session_id == 0x0000, treat as operation on tunnel */ | |
fd558d18 JC |
1515 | if ((session->session_id == 0) && |
1516 | (session->peer_session_id == 0)) { | |
7198c77a | 1517 | tunnel = session->tunnel; |
fd558d18 | 1518 | err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val); |
321a52a3 GN |
1519 | if (err) |
1520 | goto end_put_sess; | |
1521 | } else { | |
fd558d18 | 1522 | err = pppol2tp_session_getsockopt(sk, session, optname, &val); |
321a52a3 GN |
1523 | if (err) |
1524 | goto end_put_sess; | |
1525 | } | |
fd558d18 JC |
1526 | |
1527 | err = -EFAULT; | |
e3192690 | 1528 | if (put_user(len, optlen)) |
fd558d18 JC |
1529 | goto end_put_sess; |
1530 | ||
1531 | if (copy_to_user((void __user *) optval, &val, len)) | |
1532 | goto end_put_sess; | |
1533 | ||
1534 | err = 0; | |
1535 | ||
1536 | end_put_sess: | |
1537 | sock_put(sk); | |
1538 | end: | |
1539 | return err; | |
1540 | } | |
1541 | ||
1542 | /***************************************************************************** | |
1543 | * /proc filesystem for debug | |
f7faffa3 JC |
1544 | * Since the original pppol2tp driver provided /proc/net/pppol2tp for |
1545 | * L2TPv2, we dump only L2TPv2 tunnels and sessions here. | |
fd558d18 JC |
1546 | *****************************************************************************/ |
1547 | ||
1548 | static unsigned int pppol2tp_net_id; | |
1549 | ||
1550 | #ifdef CONFIG_PROC_FS | |
1551 | ||
1552 | struct pppol2tp_seq_data { | |
1553 | struct seq_net_private p; | |
1554 | int tunnel_idx; /* current tunnel */ | |
1555 | int session_idx; /* index of session within current tunnel */ | |
1556 | struct l2tp_tunnel *tunnel; | |
1557 | struct l2tp_session *session; /* NULL means get next tunnel */ | |
1558 | }; | |
1559 | ||
1560 | static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd) | |
1561 | { | |
141da007 GN |
1562 | /* Drop reference taken during previous invocation */ |
1563 | if (pd->tunnel) | |
1564 | l2tp_tunnel_dec_refcount(pd->tunnel); | |
1565 | ||
f7faffa3 | 1566 | for (;;) { |
141da007 | 1567 | pd->tunnel = l2tp_tunnel_get_nth(net, pd->tunnel_idx); |
f7faffa3 JC |
1568 | pd->tunnel_idx++; |
1569 | ||
141da007 GN |
1570 | /* Only accept L2TPv2 tunnels */ |
1571 | if (!pd->tunnel || pd->tunnel->version == 2) | |
1572 | return; | |
f7faffa3 | 1573 | |
141da007 | 1574 | l2tp_tunnel_dec_refcount(pd->tunnel); |
f7faffa3 | 1575 | } |
fd558d18 JC |
1576 | } |
1577 | ||
1578 | static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd) | |
1579 | { | |
a4346210 | 1580 | pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx); |
fd558d18 | 1581 | pd->session_idx++; |
f7faffa3 | 1582 | |
fd558d18 JC |
1583 | if (pd->session == NULL) { |
1584 | pd->session_idx = 0; | |
1585 | pppol2tp_next_tunnel(net, pd); | |
1586 | } | |
1587 | } | |
1588 | ||
1589 | static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs) | |
1590 | { | |
1591 | struct pppol2tp_seq_data *pd = SEQ_START_TOKEN; | |
1592 | loff_t pos = *offs; | |
1593 | struct net *net; | |
1594 | ||
1595 | if (!pos) | |
1596 | goto out; | |
1597 | ||
1598 | BUG_ON(m->private == NULL); | |
1599 | pd = m->private; | |
1600 | net = seq_file_net(m); | |
1601 | ||
1602 | if (pd->tunnel == NULL) | |
1603 | pppol2tp_next_tunnel(net, pd); | |
1604 | else | |
1605 | pppol2tp_next_session(net, pd); | |
1606 | ||
1607 | /* NULL tunnel and session indicates end of list */ | |
1608 | if ((pd->tunnel == NULL) && (pd->session == NULL)) | |
1609 | pd = NULL; | |
1610 | ||
1611 | out: | |
1612 | return pd; | |
1613 | } | |
1614 | ||
1615 | static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
1616 | { | |
1617 | (*pos)++; | |
1618 | return NULL; | |
1619 | } | |
1620 | ||
1621 | static void pppol2tp_seq_stop(struct seq_file *p, void *v) | |
1622 | { | |
141da007 GN |
1623 | struct pppol2tp_seq_data *pd = v; |
1624 | ||
1625 | if (!pd || pd == SEQ_START_TOKEN) | |
1626 | return; | |
1627 | ||
1628 | /* Drop reference taken by last invocation of pppol2tp_next_tunnel() */ | |
3e8f7ee4 | 1629 | if (pd->tunnel) { |
141da007 | 1630 | l2tp_tunnel_dec_refcount(pd->tunnel); |
3e8f7ee4 GN |
1631 | pd->tunnel = NULL; |
1632 | pd->session = NULL; | |
1633 | } | |
fd558d18 JC |
1634 | } |
1635 | ||
1636 | static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v) | |
1637 | { | |
1638 | struct l2tp_tunnel *tunnel = v; | |
1639 | ||
1640 | seq_printf(m, "\nTUNNEL '%s', %c %d\n", | |
1641 | tunnel->name, | |
1642 | (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N', | |
fbea9e07 | 1643 | refcount_read(&tunnel->ref_count) - 1); |
7b7c0719 | 1644 | seq_printf(m, " %08x %ld/%ld/%ld %ld/%ld/%ld\n", |
fd558d18 | 1645 | tunnel->debug, |
7b7c0719 TP |
1646 | atomic_long_read(&tunnel->stats.tx_packets), |
1647 | atomic_long_read(&tunnel->stats.tx_bytes), | |
1648 | atomic_long_read(&tunnel->stats.tx_errors), | |
1649 | atomic_long_read(&tunnel->stats.rx_packets), | |
1650 | atomic_long_read(&tunnel->stats.rx_bytes), | |
1651 | atomic_long_read(&tunnel->stats.rx_errors)); | |
fd558d18 JC |
1652 | } |
1653 | ||
1654 | static void pppol2tp_seq_session_show(struct seq_file *m, void *v) | |
1655 | { | |
1656 | struct l2tp_session *session = v; | |
1657 | struct l2tp_tunnel *tunnel = session->tunnel; | |
ee40fb2e GN |
1658 | unsigned char state; |
1659 | char user_data_ok; | |
1660 | struct sock *sk; | |
fd558d18 JC |
1661 | u32 ip = 0; |
1662 | u16 port = 0; | |
1663 | ||
1664 | if (tunnel->sock) { | |
1665 | struct inet_sock *inet = inet_sk(tunnel->sock); | |
1666 | ip = ntohl(inet->inet_saddr); | |
1667 | port = ntohs(inet->inet_sport); | |
1668 | } | |
1669 | ||
ee40fb2e GN |
1670 | sk = pppol2tp_session_get_sock(session); |
1671 | if (sk) { | |
1672 | state = sk->sk_state; | |
1673 | user_data_ok = (session == sk->sk_user_data) ? 'Y' : 'N'; | |
1674 | } else { | |
1675 | state = 0; | |
1676 | user_data_ok = 'N'; | |
1677 | } | |
1678 | ||
fd558d18 JC |
1679 | seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> " |
1680 | "%04X/%04X %d %c\n", | |
1681 | session->name, ip, port, | |
1682 | tunnel->tunnel_id, | |
1683 | session->session_id, | |
1684 | tunnel->peer_tunnel_id, | |
1685 | session->peer_session_id, | |
ee40fb2e | 1686 | state, user_data_ok); |
fd558d18 JC |
1687 | seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n", |
1688 | session->mtu, session->mru, | |
1689 | session->recv_seq ? 'R' : '-', | |
1690 | session->send_seq ? 'S' : '-', | |
1691 | session->lns_mode ? "LNS" : "LAC", | |
1692 | session->debug, | |
1693 | jiffies_to_msecs(session->reorder_timeout)); | |
7b7c0719 | 1694 | seq_printf(m, " %hu/%hu %ld/%ld/%ld %ld/%ld/%ld\n", |
fd558d18 | 1695 | session->nr, session->ns, |
7b7c0719 TP |
1696 | atomic_long_read(&session->stats.tx_packets), |
1697 | atomic_long_read(&session->stats.tx_bytes), | |
1698 | atomic_long_read(&session->stats.tx_errors), | |
1699 | atomic_long_read(&session->stats.rx_packets), | |
1700 | atomic_long_read(&session->stats.rx_bytes), | |
1701 | atomic_long_read(&session->stats.rx_errors)); | |
9345471b | 1702 | |
ee40fb2e GN |
1703 | if (sk) { |
1704 | struct pppox_sock *po = pppox_sk(sk); | |
1705 | ||
9345471b | 1706 | seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan)); |
ee40fb2e GN |
1707 | sock_put(sk); |
1708 | } | |
fd558d18 JC |
1709 | } |
1710 | ||
1711 | static int pppol2tp_seq_show(struct seq_file *m, void *v) | |
1712 | { | |
1713 | struct pppol2tp_seq_data *pd = v; | |
1714 | ||
1715 | /* display header on line 1 */ | |
1716 | if (v == SEQ_START_TOKEN) { | |
1717 | seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n"); | |
1718 | seq_puts(m, "TUNNEL name, user-data-ok session-count\n"); | |
1719 | seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
1720 | seq_puts(m, " SESSION name, addr/port src-tid/sid " | |
1721 | "dest-tid/sid state user-data-ok\n"); | |
1722 | seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n"); | |
1723 | seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
1724 | goto out; | |
1725 | } | |
1726 | ||
1727 | /* Show the tunnel or session context. | |
1728 | */ | |
e08293a4 | 1729 | if (!pd->session) { |
fd558d18 | 1730 | pppol2tp_seq_tunnel_show(m, pd->tunnel); |
e08293a4 | 1731 | } else { |
fd558d18 | 1732 | pppol2tp_seq_session_show(m, pd->session); |
e08293a4 GN |
1733 | l2tp_session_dec_refcount(pd->session); |
1734 | } | |
fd558d18 JC |
1735 | |
1736 | out: | |
1737 | return 0; | |
1738 | } | |
1739 | ||
1740 | static const struct seq_operations pppol2tp_seq_ops = { | |
1741 | .start = pppol2tp_seq_start, | |
1742 | .next = pppol2tp_seq_next, | |
1743 | .stop = pppol2tp_seq_stop, | |
1744 | .show = pppol2tp_seq_show, | |
1745 | }; | |
1746 | ||
1747 | /* Called when our /proc file is opened. We allocate data for use when | |
1748 | * iterating our tunnel / session contexts and store it in the private | |
1749 | * data of the seq_file. | |
1750 | */ | |
1751 | static int pppol2tp_proc_open(struct inode *inode, struct file *file) | |
1752 | { | |
1753 | return seq_open_net(inode, file, &pppol2tp_seq_ops, | |
1754 | sizeof(struct pppol2tp_seq_data)); | |
1755 | } | |
1756 | ||
1757 | static const struct file_operations pppol2tp_proc_fops = { | |
1758 | .owner = THIS_MODULE, | |
1759 | .open = pppol2tp_proc_open, | |
1760 | .read = seq_read, | |
1761 | .llseek = seq_lseek, | |
1762 | .release = seq_release_net, | |
1763 | }; | |
1764 | ||
1765 | #endif /* CONFIG_PROC_FS */ | |
1766 | ||
1767 | /***************************************************************************** | |
1768 | * Network namespace | |
1769 | *****************************************************************************/ | |
1770 | ||
1771 | static __net_init int pppol2tp_init_net(struct net *net) | |
1772 | { | |
1773 | struct proc_dir_entry *pde; | |
1774 | int err = 0; | |
1775 | ||
d4beaa66 G |
1776 | pde = proc_create("pppol2tp", S_IRUGO, net->proc_net, |
1777 | &pppol2tp_proc_fops); | |
fd558d18 JC |
1778 | if (!pde) { |
1779 | err = -ENOMEM; | |
1780 | goto out; | |
1781 | } | |
1782 | ||
1783 | out: | |
1784 | return err; | |
1785 | } | |
1786 | ||
1787 | static __net_exit void pppol2tp_exit_net(struct net *net) | |
1788 | { | |
ece31ffd | 1789 | remove_proc_entry("pppol2tp", net->proc_net); |
fd558d18 JC |
1790 | } |
1791 | ||
1792 | static struct pernet_operations pppol2tp_net_ops = { | |
1793 | .init = pppol2tp_init_net, | |
1794 | .exit = pppol2tp_exit_net, | |
1795 | .id = &pppol2tp_net_id, | |
1796 | }; | |
1797 | ||
1798 | /***************************************************************************** | |
1799 | * Init and cleanup | |
1800 | *****************************************************************************/ | |
1801 | ||
1802 | static const struct proto_ops pppol2tp_ops = { | |
1803 | .family = AF_PPPOX, | |
1804 | .owner = THIS_MODULE, | |
1805 | .release = pppol2tp_release, | |
1806 | .bind = sock_no_bind, | |
1807 | .connect = pppol2tp_connect, | |
1808 | .socketpair = sock_no_socketpair, | |
1809 | .accept = sock_no_accept, | |
1810 | .getname = pppol2tp_getname, | |
1811 | .poll = datagram_poll, | |
1812 | .listen = sock_no_listen, | |
1813 | .shutdown = sock_no_shutdown, | |
1814 | .setsockopt = pppol2tp_setsockopt, | |
1815 | .getsockopt = pppol2tp_getsockopt, | |
1816 | .sendmsg = pppol2tp_sendmsg, | |
1817 | .recvmsg = pppol2tp_recvmsg, | |
1818 | .mmap = sock_no_mmap, | |
1819 | .ioctl = pppox_ioctl, | |
1820 | }; | |
1821 | ||
756e64a0 | 1822 | static const struct pppox_proto pppol2tp_proto = { |
fd558d18 | 1823 | .create = pppol2tp_create, |
e1558a93 WY |
1824 | .ioctl = pppol2tp_ioctl, |
1825 | .owner = THIS_MODULE, | |
fd558d18 JC |
1826 | }; |
1827 | ||
309795f4 JC |
1828 | #ifdef CONFIG_L2TP_V3 |
1829 | ||
1830 | static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = { | |
1831 | .session_create = pppol2tp_session_create, | |
cf2f5c88 | 1832 | .session_delete = l2tp_session_delete, |
309795f4 JC |
1833 | }; |
1834 | ||
1835 | #endif /* CONFIG_L2TP_V3 */ | |
1836 | ||
fd558d18 JC |
1837 | static int __init pppol2tp_init(void) |
1838 | { | |
1839 | int err; | |
1840 | ||
1841 | err = register_pernet_device(&pppol2tp_net_ops); | |
1842 | if (err) | |
1843 | goto out; | |
1844 | ||
1845 | err = proto_register(&pppol2tp_sk_proto, 0); | |
1846 | if (err) | |
1847 | goto out_unregister_pppol2tp_pernet; | |
1848 | ||
1849 | err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto); | |
1850 | if (err) | |
1851 | goto out_unregister_pppol2tp_proto; | |
1852 | ||
309795f4 JC |
1853 | #ifdef CONFIG_L2TP_V3 |
1854 | err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops); | |
1855 | if (err) | |
1856 | goto out_unregister_pppox; | |
1857 | #endif | |
1858 | ||
a4ca44fa | 1859 | pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION); |
fd558d18 JC |
1860 | |
1861 | out: | |
1862 | return err; | |
309795f4 JC |
1863 | |
1864 | #ifdef CONFIG_L2TP_V3 | |
1865 | out_unregister_pppox: | |
1866 | unregister_pppox_proto(PX_PROTO_OL2TP); | |
1867 | #endif | |
fd558d18 JC |
1868 | out_unregister_pppol2tp_proto: |
1869 | proto_unregister(&pppol2tp_sk_proto); | |
1870 | out_unregister_pppol2tp_pernet: | |
1871 | unregister_pernet_device(&pppol2tp_net_ops); | |
1872 | goto out; | |
1873 | } | |
1874 | ||
1875 | static void __exit pppol2tp_exit(void) | |
1876 | { | |
309795f4 JC |
1877 | #ifdef CONFIG_L2TP_V3 |
1878 | l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP); | |
1879 | #endif | |
fd558d18 JC |
1880 | unregister_pppox_proto(PX_PROTO_OL2TP); |
1881 | proto_unregister(&pppol2tp_sk_proto); | |
1882 | unregister_pernet_device(&pppol2tp_net_ops); | |
1883 | } | |
1884 | ||
1885 | module_init(pppol2tp_init); | |
1886 | module_exit(pppol2tp_exit); | |
1887 | ||
1888 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); | |
1889 | MODULE_DESCRIPTION("PPP over L2TP over UDP"); | |
1890 | MODULE_LICENSE("GPL"); | |
1891 | MODULE_VERSION(PPPOL2TP_DRV_VERSION); | |
681b4d88 | 1892 | MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_OL2TP); |
249ee819 | 1893 | MODULE_ALIAS_L2TP_PWTYPE(7); |