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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 | ||
125 | struct sock *sock; /* Pointer to the session | |
126 | * PPPoX socket */ | |
127 | struct sock *tunnel_sock; /* Pointer to the tunnel UDP | |
128 | * socket */ | |
129 | int flags; /* accessed by PPPIOCGFLAGS. | |
130 | * Unused. */ | |
131 | }; | |
132 | ||
133 | static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb); | |
134 | ||
d7100da0 | 135 | static const struct ppp_channel_ops pppol2tp_chan_ops = { |
136 | .start_xmit = pppol2tp_xmit, | |
137 | }; | |
138 | ||
fd558d18 JC |
139 | static const struct proto_ops pppol2tp_ops; |
140 | ||
141 | /* Helpers to obtain tunnel/session contexts from sockets. | |
142 | */ | |
143 | static inline struct l2tp_session *pppol2tp_sock_to_session(struct sock *sk) | |
144 | { | |
145 | struct l2tp_session *session; | |
146 | ||
147 | if (sk == NULL) | |
148 | return NULL; | |
149 | ||
150 | sock_hold(sk); | |
151 | session = (struct l2tp_session *)(sk->sk_user_data); | |
152 | if (session == NULL) { | |
153 | sock_put(sk); | |
154 | goto out; | |
155 | } | |
156 | ||
157 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
158 | ||
159 | out: | |
160 | return session; | |
161 | } | |
162 | ||
163 | /***************************************************************************** | |
164 | * Receive data handling | |
165 | *****************************************************************************/ | |
166 | ||
167 | static int pppol2tp_recv_payload_hook(struct sk_buff *skb) | |
168 | { | |
169 | /* Skip PPP header, if present. In testing, Microsoft L2TP clients | |
170 | * don't send the PPP header (PPP header compression enabled), but | |
171 | * other clients can include the header. So we cope with both cases | |
172 | * here. The PPP header is always FF03 when using L2TP. | |
173 | * | |
174 | * Note that skb->data[] isn't dereferenced from a u16 ptr here since | |
175 | * the field may be unaligned. | |
176 | */ | |
177 | if (!pskb_may_pull(skb, 2)) | |
178 | return 1; | |
179 | ||
54c151d9 | 180 | if ((skb->data[0] == PPP_ALLSTATIONS) && (skb->data[1] == PPP_UI)) |
fd558d18 JC |
181 | skb_pull(skb, 2); |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
186 | /* Receive message. This is the recvmsg for the PPPoL2TP socket. | |
187 | */ | |
1b784140 YX |
188 | static int pppol2tp_recvmsg(struct socket *sock, struct msghdr *msg, |
189 | size_t len, int flags) | |
fd558d18 JC |
190 | { |
191 | int err; | |
192 | struct sk_buff *skb; | |
193 | struct sock *sk = sock->sk; | |
194 | ||
195 | err = -EIO; | |
196 | if (sk->sk_state & PPPOX_BOUND) | |
197 | goto end; | |
198 | ||
fd558d18 JC |
199 | err = 0; |
200 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
201 | flags & MSG_DONTWAIT, &err); | |
202 | if (!skb) | |
203 | goto end; | |
204 | ||
205 | if (len > skb->len) | |
206 | len = skb->len; | |
207 | else if (len < skb->len) | |
208 | msg->msg_flags |= MSG_TRUNC; | |
209 | ||
51f3d02b | 210 | err = skb_copy_datagram_msg(skb, 0, msg, len); |
fd558d18 JC |
211 | if (likely(err == 0)) |
212 | err = len; | |
213 | ||
214 | kfree_skb(skb); | |
215 | end: | |
216 | return err; | |
217 | } | |
218 | ||
219 | static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len) | |
220 | { | |
221 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
222 | struct sock *sk = NULL; | |
223 | ||
224 | /* If the socket is bound, send it in to PPP's input queue. Otherwise | |
225 | * queue it on the session socket. | |
226 | */ | |
227 | sk = ps->sock; | |
228 | if (sk == NULL) | |
229 | goto no_sock; | |
230 | ||
231 | if (sk->sk_state & PPPOX_BOUND) { | |
232 | struct pppox_sock *po; | |
98f40b3e | 233 | |
fba40c63 | 234 | l2tp_dbg(session, L2TP_MSG_DATA, |
a4ca44fa JP |
235 | "%s: recv %d byte data frame, passing to ppp\n", |
236 | session->name, data_len); | |
fd558d18 | 237 | |
fd558d18 JC |
238 | po = pppox_sk(sk); |
239 | ppp_input(&po->chan, skb); | |
240 | } else { | |
fba40c63 | 241 | l2tp_dbg(session, L2TP_MSG_DATA, |
9e9cb622 GN |
242 | "%s: recv %d byte data frame, passing to L2TP socket\n", |
243 | session->name, data_len); | |
fd558d18 | 244 | |
9e9cb622 GN |
245 | if (sock_queue_rcv_skb(sk, skb) < 0) { |
246 | atomic_long_inc(&session->stats.rx_errors); | |
247 | kfree_skb(skb); | |
248 | } | |
fd558d18 JC |
249 | } |
250 | ||
251 | return; | |
252 | ||
253 | no_sock: | |
fba40c63 | 254 | l2tp_info(session, L2TP_MSG_DATA, "%s: no socket\n", session->name); |
fd558d18 JC |
255 | kfree_skb(skb); |
256 | } | |
257 | ||
258 | static void pppol2tp_session_sock_hold(struct l2tp_session *session) | |
259 | { | |
260 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
261 | ||
262 | if (ps->sock) | |
263 | sock_hold(ps->sock); | |
264 | } | |
265 | ||
266 | static void pppol2tp_session_sock_put(struct l2tp_session *session) | |
267 | { | |
268 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
269 | ||
270 | if (ps->sock) | |
271 | sock_put(ps->sock); | |
272 | } | |
273 | ||
274 | /************************************************************************ | |
275 | * Transmit handling | |
276 | ***********************************************************************/ | |
277 | ||
fd558d18 JC |
278 | /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here |
279 | * when a user application does a sendmsg() on the session socket. L2TP and | |
280 | * PPP headers must be inserted into the user's data. | |
281 | */ | |
1b784140 | 282 | static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m, |
fd558d18 JC |
283 | size_t total_len) |
284 | { | |
fd558d18 JC |
285 | struct sock *sk = sock->sk; |
286 | struct sk_buff *skb; | |
287 | int error; | |
288 | struct l2tp_session *session; | |
289 | struct l2tp_tunnel *tunnel; | |
290 | struct pppol2tp_session *ps; | |
0d76751f | 291 | int uhlen; |
fd558d18 JC |
292 | |
293 | error = -ENOTCONN; | |
294 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
295 | goto error; | |
296 | ||
297 | /* Get session and tunnel contexts */ | |
298 | error = -EBADF; | |
299 | session = pppol2tp_sock_to_session(sk); | |
300 | if (session == NULL) | |
301 | goto error; | |
302 | ||
303 | ps = l2tp_session_priv(session); | |
304 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
305 | if (tunnel == NULL) | |
306 | goto error_put_sess; | |
307 | ||
0d76751f JC |
308 | uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0; |
309 | ||
fd558d18 JC |
310 | /* Allocate a socket buffer */ |
311 | error = -ENOMEM; | |
312 | skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) + | |
0d76751f | 313 | uhlen + session->hdr_len + |
54c151d9 | 314 | 2 + total_len, /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */ |
fd558d18 JC |
315 | 0, GFP_KERNEL); |
316 | if (!skb) | |
317 | goto error_put_sess_tun; | |
318 | ||
319 | /* Reserve space for headers. */ | |
320 | skb_reserve(skb, NET_SKB_PAD); | |
321 | skb_reset_network_header(skb); | |
322 | skb_reserve(skb, sizeof(struct iphdr)); | |
323 | skb_reset_transport_header(skb); | |
0d76751f | 324 | skb_reserve(skb, uhlen); |
fd558d18 JC |
325 | |
326 | /* Add PPP header */ | |
54c151d9 GF |
327 | skb->data[0] = PPP_ALLSTATIONS; |
328 | skb->data[1] = PPP_UI; | |
fd558d18 JC |
329 | skb_put(skb, 2); |
330 | ||
331 | /* Copy user data into skb */ | |
6ce8e9ce | 332 | error = memcpy_from_msg(skb_put(skb, total_len), m, total_len); |
fd558d18 JC |
333 | if (error < 0) { |
334 | kfree_skb(skb); | |
335 | goto error_put_sess_tun; | |
336 | } | |
fd558d18 | 337 | |
455cc32b | 338 | local_bh_disable(); |
fd558d18 | 339 | l2tp_xmit_skb(session, skb, session->hdr_len); |
455cc32b | 340 | local_bh_enable(); |
fd558d18 JC |
341 | |
342 | sock_put(ps->tunnel_sock); | |
8b82547e | 343 | sock_put(sk); |
fd558d18 | 344 | |
a6f79d0f | 345 | return total_len; |
fd558d18 JC |
346 | |
347 | error_put_sess_tun: | |
348 | sock_put(ps->tunnel_sock); | |
349 | error_put_sess: | |
350 | sock_put(sk); | |
351 | error: | |
352 | return error; | |
353 | } | |
354 | ||
355 | /* Transmit function called by generic PPP driver. Sends PPP frame | |
356 | * over PPPoL2TP socket. | |
357 | * | |
358 | * This is almost the same as pppol2tp_sendmsg(), but rather than | |
359 | * being called with a msghdr from userspace, it is called with a skb | |
360 | * from the kernel. | |
361 | * | |
362 | * The supplied skb from ppp doesn't have enough headroom for the | |
363 | * insertion of L2TP, UDP and IP headers so we need to allocate more | |
364 | * headroom in the skb. This will create a cloned skb. But we must be | |
365 | * careful in the error case because the caller will expect to free | |
366 | * the skb it supplied, not our cloned skb. So we take care to always | |
367 | * leave the original skb unfreed if we return an error. | |
368 | */ | |
369 | static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb) | |
370 | { | |
fd558d18 JC |
371 | struct sock *sk = (struct sock *) chan->private; |
372 | struct sock *sk_tun; | |
fd558d18 JC |
373 | struct l2tp_session *session; |
374 | struct l2tp_tunnel *tunnel; | |
375 | struct pppol2tp_session *ps; | |
09df57ca | 376 | int uhlen, headroom; |
fd558d18 JC |
377 | |
378 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
379 | goto abort; | |
380 | ||
381 | /* Get session and tunnel contexts from the socket */ | |
382 | session = pppol2tp_sock_to_session(sk); | |
383 | if (session == NULL) | |
384 | goto abort; | |
385 | ||
386 | ps = l2tp_session_priv(session); | |
387 | sk_tun = ps->tunnel_sock; | |
388 | if (sk_tun == NULL) | |
389 | goto abort_put_sess; | |
390 | tunnel = l2tp_sock_to_tunnel(sk_tun); | |
391 | if (tunnel == NULL) | |
392 | goto abort_put_sess; | |
393 | ||
09df57ca ED |
394 | uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0; |
395 | headroom = NET_SKB_PAD + | |
396 | sizeof(struct iphdr) + /* IP header */ | |
397 | uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */ | |
398 | session->hdr_len + /* L2TP header */ | |
54c151d9 | 399 | 2; /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */ |
09df57ca | 400 | if (skb_cow_head(skb, headroom)) |
fd558d18 JC |
401 | goto abort_put_sess_tun; |
402 | ||
fd558d18 | 403 | /* Setup PPP header */ |
54c151d9 GF |
404 | __skb_push(skb, 2); |
405 | skb->data[0] = PPP_ALLSTATIONS; | |
406 | skb->data[1] = PPP_UI; | |
fd558d18 | 407 | |
455cc32b | 408 | local_bh_disable(); |
e0d4435f | 409 | l2tp_xmit_skb(session, skb, session->hdr_len); |
455cc32b | 410 | local_bh_enable(); |
fd558d18 JC |
411 | |
412 | sock_put(sk_tun); | |
413 | sock_put(sk); | |
414 | return 1; | |
415 | ||
416 | abort_put_sess_tun: | |
417 | sock_put(sk_tun); | |
418 | abort_put_sess: | |
419 | sock_put(sk); | |
420 | abort: | |
421 | /* Free the original skb */ | |
422 | kfree_skb(skb); | |
423 | return 1; | |
424 | } | |
425 | ||
426 | /***************************************************************************** | |
427 | * Session (and tunnel control) socket create/destroy. | |
428 | *****************************************************************************/ | |
429 | ||
430 | /* Called by l2tp_core when a session socket is being closed. | |
431 | */ | |
432 | static void pppol2tp_session_close(struct l2tp_session *session) | |
433 | { | |
434 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
435 | struct sock *sk = ps->sock; | |
cf2f5c88 | 436 | struct socket *sock = sk->sk_socket; |
fd558d18 JC |
437 | |
438 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
439 | ||
cf2f5c88 | 440 | if (sock) { |
54c151d9 | 441 | inet_shutdown(sock, SEND_SHUTDOWN); |
cf2f5c88 TP |
442 | /* Don't let the session go away before our socket does */ |
443 | l2tp_session_inc_refcount(session); | |
fd558d18 | 444 | } |
fd558d18 JC |
445 | } |
446 | ||
447 | /* Really kill the session socket. (Called from sock_put() if | |
448 | * refcnt == 0.) | |
449 | */ | |
450 | static void pppol2tp_session_destruct(struct sock *sk) | |
451 | { | |
f6e16b29 | 452 | struct l2tp_session *session = sk->sk_user_data; |
e91793bb GN |
453 | |
454 | skb_queue_purge(&sk->sk_receive_queue); | |
455 | skb_queue_purge(&sk->sk_write_queue); | |
456 | ||
f6e16b29 | 457 | if (session) { |
fd558d18 JC |
458 | sk->sk_user_data = NULL; |
459 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
460 | l2tp_session_dec_refcount(session); | |
461 | } | |
fd558d18 JC |
462 | } |
463 | ||
464 | /* Called when the PPPoX socket (session) is closed. | |
465 | */ | |
466 | static int pppol2tp_release(struct socket *sock) | |
467 | { | |
468 | struct sock *sk = sock->sk; | |
469 | struct l2tp_session *session; | |
470 | int error; | |
471 | ||
472 | if (!sk) | |
473 | return 0; | |
474 | ||
475 | error = -EBADF; | |
476 | lock_sock(sk); | |
477 | if (sock_flag(sk, SOCK_DEAD) != 0) | |
478 | goto error; | |
479 | ||
480 | pppox_unbind_sock(sk); | |
481 | ||
482 | /* Signal the death of the socket. */ | |
483 | sk->sk_state = PPPOX_DEAD; | |
484 | sock_orphan(sk); | |
485 | sock->sk = NULL; | |
486 | ||
487 | session = pppol2tp_sock_to_session(sk); | |
488 | ||
489 | /* Purge any queued data */ | |
fd558d18 | 490 | if (session != NULL) { |
f6e16b29 | 491 | __l2tp_session_unhash(session); |
cf2f5c88 | 492 | l2tp_session_queue_purge(session); |
fd558d18 JC |
493 | sock_put(sk); |
494 | } | |
fd558d18 JC |
495 | release_sock(sk); |
496 | ||
497 | /* This will delete the session context via | |
498 | * pppol2tp_session_destruct() if the socket's refcnt drops to | |
499 | * zero. | |
500 | */ | |
501 | sock_put(sk); | |
502 | ||
503 | return 0; | |
504 | ||
505 | error: | |
506 | release_sock(sk); | |
507 | return error; | |
508 | } | |
509 | ||
510 | static struct proto pppol2tp_sk_proto = { | |
511 | .name = "PPPOL2TP", | |
512 | .owner = THIS_MODULE, | |
513 | .obj_size = sizeof(struct pppox_sock), | |
514 | }; | |
515 | ||
516 | static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb) | |
517 | { | |
518 | int rc; | |
519 | ||
520 | rc = l2tp_udp_encap_recv(sk, skb); | |
521 | if (rc) | |
522 | kfree_skb(skb); | |
523 | ||
524 | return NET_RX_SUCCESS; | |
525 | } | |
526 | ||
527 | /* socket() handler. Initialize a new struct sock. | |
528 | */ | |
11aa9c28 | 529 | static int pppol2tp_create(struct net *net, struct socket *sock, int kern) |
fd558d18 JC |
530 | { |
531 | int error = -ENOMEM; | |
532 | struct sock *sk; | |
533 | ||
11aa9c28 | 534 | sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto, kern); |
fd558d18 JC |
535 | if (!sk) |
536 | goto out; | |
537 | ||
538 | sock_init_data(sock, sk); | |
539 | ||
540 | sock->state = SS_UNCONNECTED; | |
541 | sock->ops = &pppol2tp_ops; | |
542 | ||
543 | sk->sk_backlog_rcv = pppol2tp_backlog_recv; | |
544 | sk->sk_protocol = PX_PROTO_OL2TP; | |
545 | sk->sk_family = PF_PPPOX; | |
546 | sk->sk_state = PPPOX_NONE; | |
547 | sk->sk_type = SOCK_STREAM; | |
548 | sk->sk_destruct = pppol2tp_session_destruct; | |
549 | ||
550 | error = 0; | |
551 | ||
552 | out: | |
553 | return error; | |
554 | } | |
555 | ||
9dd79945 | 556 | #if IS_ENABLED(CONFIG_L2TP_DEBUGFS) |
0ad66140 JC |
557 | static void pppol2tp_show(struct seq_file *m, void *arg) |
558 | { | |
559 | struct l2tp_session *session = arg; | |
560 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
561 | ||
562 | if (ps) { | |
563 | struct pppox_sock *po = pppox_sk(ps->sock); | |
564 | if (po) | |
565 | seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan)); | |
566 | } | |
567 | } | |
568 | #endif | |
569 | ||
fd558d18 JC |
570 | /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket |
571 | */ | |
572 | static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr, | |
573 | int sockaddr_len, int flags) | |
574 | { | |
575 | struct sock *sk = sock->sk; | |
576 | struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr; | |
577 | struct pppox_sock *po = pppox_sk(sk); | |
578 | struct l2tp_session *session = NULL; | |
579 | struct l2tp_tunnel *tunnel; | |
580 | struct pppol2tp_session *ps; | |
581 | struct dst_entry *dst; | |
582 | struct l2tp_session_cfg cfg = { 0, }; | |
583 | int error = 0; | |
e0d4435f JC |
584 | u32 tunnel_id, peer_tunnel_id; |
585 | u32 session_id, peer_session_id; | |
dbdbc73b | 586 | bool drop_refcnt = false; |
e0d4435f JC |
587 | int ver = 2; |
588 | int fd; | |
fd558d18 JC |
589 | |
590 | lock_sock(sk); | |
591 | ||
592 | error = -EINVAL; | |
593 | if (sp->sa_protocol != PX_PROTO_OL2TP) | |
594 | goto end; | |
595 | ||
596 | /* Check for already bound sockets */ | |
597 | error = -EBUSY; | |
598 | if (sk->sk_state & PPPOX_CONNECTED) | |
599 | goto end; | |
600 | ||
601 | /* We don't supporting rebinding anyway */ | |
602 | error = -EALREADY; | |
603 | if (sk->sk_user_data) | |
604 | goto end; /* socket is already attached */ | |
605 | ||
b79585f5 JC |
606 | /* Get params from socket address. Handle L2TPv2 and L2TPv3. |
607 | * This is nasty because there are different sockaddr_pppol2tp | |
608 | * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use | |
609 | * the sockaddr size to determine which structure the caller | |
610 | * is using. | |
611 | */ | |
612 | peer_tunnel_id = 0; | |
e0d4435f JC |
613 | if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) { |
614 | fd = sp->pppol2tp.fd; | |
615 | tunnel_id = sp->pppol2tp.s_tunnel; | |
616 | peer_tunnel_id = sp->pppol2tp.d_tunnel; | |
617 | session_id = sp->pppol2tp.s_session; | |
618 | peer_session_id = sp->pppol2tp.d_session; | |
619 | } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) { | |
b79585f5 JC |
620 | struct sockaddr_pppol2tpv3 *sp3 = |
621 | (struct sockaddr_pppol2tpv3 *) sp; | |
e0d4435f JC |
622 | ver = 3; |
623 | fd = sp3->pppol2tp.fd; | |
624 | tunnel_id = sp3->pppol2tp.s_tunnel; | |
625 | peer_tunnel_id = sp3->pppol2tp.d_tunnel; | |
626 | session_id = sp3->pppol2tp.s_session; | |
627 | peer_session_id = sp3->pppol2tp.d_session; | |
b79585f5 JC |
628 | } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpin6)) { |
629 | struct sockaddr_pppol2tpin6 *sp6 = | |
630 | (struct sockaddr_pppol2tpin6 *) sp; | |
631 | fd = sp6->pppol2tp.fd; | |
632 | tunnel_id = sp6->pppol2tp.s_tunnel; | |
633 | peer_tunnel_id = sp6->pppol2tp.d_tunnel; | |
634 | session_id = sp6->pppol2tp.s_session; | |
635 | peer_session_id = sp6->pppol2tp.d_session; | |
636 | } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3in6)) { | |
637 | struct sockaddr_pppol2tpv3in6 *sp6 = | |
638 | (struct sockaddr_pppol2tpv3in6 *) sp; | |
639 | ver = 3; | |
640 | fd = sp6->pppol2tp.fd; | |
641 | tunnel_id = sp6->pppol2tp.s_tunnel; | |
642 | peer_tunnel_id = sp6->pppol2tp.d_tunnel; | |
643 | session_id = sp6->pppol2tp.s_session; | |
644 | peer_session_id = sp6->pppol2tp.d_session; | |
e0d4435f JC |
645 | } else { |
646 | error = -EINVAL; | |
647 | goto end; /* bad socket address */ | |
648 | } | |
649 | ||
650 | /* Don't bind if tunnel_id is 0 */ | |
fd558d18 | 651 | error = -EINVAL; |
e0d4435f | 652 | if (tunnel_id == 0) |
fd558d18 JC |
653 | goto end; |
654 | ||
309795f4 JC |
655 | tunnel = l2tp_tunnel_find(sock_net(sk), tunnel_id); |
656 | ||
e0d4435f JC |
657 | /* Special case: create tunnel context if session_id and |
658 | * peer_session_id is 0. Otherwise look up tunnel using supplied | |
fd558d18 JC |
659 | * tunnel id. |
660 | */ | |
e0d4435f | 661 | if ((session_id == 0) && (peer_session_id == 0)) { |
309795f4 JC |
662 | if (tunnel == NULL) { |
663 | struct l2tp_tunnel_cfg tcfg = { | |
664 | .encap = L2TP_ENCAPTYPE_UDP, | |
665 | .debug = 0, | |
666 | }; | |
667 | error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel); | |
668 | if (error < 0) | |
669 | goto end; | |
670 | } | |
fd558d18 | 671 | } else { |
fd558d18 JC |
672 | /* Error if we can't find the tunnel */ |
673 | error = -ENOENT; | |
674 | if (tunnel == NULL) | |
675 | goto end; | |
676 | ||
677 | /* Error if socket is not prepped */ | |
678 | if (tunnel->sock == NULL) | |
679 | goto end; | |
680 | } | |
681 | ||
682 | if (tunnel->recv_payload_hook == NULL) | |
683 | tunnel->recv_payload_hook = pppol2tp_recv_payload_hook; | |
684 | ||
b79585f5 JC |
685 | if (tunnel->peer_tunnel_id == 0) |
686 | tunnel->peer_tunnel_id = peer_tunnel_id; | |
fd558d18 | 687 | |
dbdbc73b GN |
688 | session = l2tp_session_get(sock_net(sk), tunnel, session_id, false); |
689 | if (session) { | |
690 | drop_refcnt = true; | |
691 | ps = l2tp_session_priv(session); | |
692 | ||
693 | /* Using a pre-existing session is fine as long as it hasn't | |
694 | * been connected yet. | |
309795f4 | 695 | */ |
dbdbc73b GN |
696 | if (ps->sock) { |
697 | error = -EEXIST; | |
698 | goto end; | |
699 | } | |
309795f4 | 700 | |
dbdbc73b GN |
701 | /* consistency checks */ |
702 | if (ps->tunnel_sock != tunnel->sock) { | |
703 | error = -EEXIST; | |
309795f4 JC |
704 | goto end; |
705 | } | |
706 | } else { | |
dbdbc73b GN |
707 | /* Default MTU must allow space for UDP/L2TP/PPP headers */ |
708 | cfg.mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD; | |
709 | cfg.mru = cfg.mtu; | |
309795f4 | 710 | |
dbdbc73b GN |
711 | session = l2tp_session_create(sizeof(struct pppol2tp_session), |
712 | tunnel, session_id, | |
713 | peer_session_id, &cfg); | |
714 | if (IS_ERR(session)) { | |
715 | error = PTR_ERR(session); | |
309795f4 | 716 | goto end; |
dbdbc73b | 717 | } |
fd558d18 JC |
718 | } |
719 | ||
309795f4 | 720 | /* Associate session with its PPPoL2TP socket */ |
fd558d18 JC |
721 | ps = l2tp_session_priv(session); |
722 | ps->owner = current->pid; | |
723 | ps->sock = sk; | |
724 | ps->tunnel_sock = tunnel->sock; | |
725 | ||
726 | session->recv_skb = pppol2tp_recv; | |
727 | session->session_close = pppol2tp_session_close; | |
9dd79945 | 728 | #if IS_ENABLED(CONFIG_L2TP_DEBUGFS) |
0ad66140 JC |
729 | session->show = pppol2tp_show; |
730 | #endif | |
fd558d18 JC |
731 | |
732 | /* We need to know each time a skb is dropped from the reorder | |
733 | * queue. | |
734 | */ | |
735 | session->ref = pppol2tp_session_sock_hold; | |
736 | session->deref = pppol2tp_session_sock_put; | |
737 | ||
738 | /* If PMTU discovery was enabled, use the MTU that was discovered */ | |
f34c4a35 | 739 | dst = sk_dst_get(tunnel->sock); |
fd558d18 | 740 | if (dst != NULL) { |
eed4d839 GN |
741 | u32 pmtu = dst_mtu(dst); |
742 | ||
fd558d18 JC |
743 | if (pmtu != 0) |
744 | session->mtu = session->mru = pmtu - | |
745 | PPPOL2TP_HEADER_OVERHEAD; | |
746 | dst_release(dst); | |
747 | } | |
748 | ||
749 | /* Special case: if source & dest session_id == 0x0000, this | |
750 | * socket is being created to manage the tunnel. Just set up | |
751 | * the internal context for use by ioctl() and sockopt() | |
752 | * handlers. | |
753 | */ | |
754 | if ((session->session_id == 0) && | |
755 | (session->peer_session_id == 0)) { | |
756 | error = 0; | |
757 | goto out_no_ppp; | |
758 | } | |
759 | ||
760 | /* The only header we need to worry about is the L2TP | |
761 | * header. This size is different depending on whether | |
762 | * sequence numbers are enabled for the data channel. | |
763 | */ | |
764 | po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
765 | ||
766 | po->chan.private = sk; | |
767 | po->chan.ops = &pppol2tp_chan_ops; | |
768 | po->chan.mtu = session->mtu; | |
769 | ||
770 | error = ppp_register_net_channel(sock_net(sk), &po->chan); | |
771 | if (error) | |
772 | goto end; | |
773 | ||
774 | out_no_ppp: | |
775 | /* This is how we get the session context from the socket. */ | |
776 | sk->sk_user_data = session; | |
777 | sk->sk_state = PPPOX_CONNECTED; | |
fba40c63 | 778 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: created\n", |
a4ca44fa | 779 | session->name); |
fd558d18 JC |
780 | |
781 | end: | |
dbdbc73b GN |
782 | if (drop_refcnt) |
783 | l2tp_session_dec_refcount(session); | |
fd558d18 JC |
784 | release_sock(sk); |
785 | ||
786 | return error; | |
787 | } | |
788 | ||
309795f4 JC |
789 | #ifdef CONFIG_L2TP_V3 |
790 | ||
791 | /* Called when creating sessions via the netlink interface. | |
792 | */ | |
793 | static int pppol2tp_session_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg) | |
794 | { | |
795 | int error; | |
796 | struct l2tp_tunnel *tunnel; | |
797 | struct l2tp_session *session; | |
798 | struct pppol2tp_session *ps; | |
799 | ||
800 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
801 | ||
802 | /* Error if we can't find the tunnel */ | |
803 | error = -ENOENT; | |
804 | if (tunnel == NULL) | |
805 | goto out; | |
806 | ||
807 | /* Error if tunnel socket is not prepped */ | |
808 | if (tunnel->sock == NULL) | |
809 | goto out; | |
810 | ||
309795f4 JC |
811 | /* Default MTU values. */ |
812 | if (cfg->mtu == 0) | |
813 | cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD; | |
814 | if (cfg->mru == 0) | |
815 | cfg->mru = cfg->mtu; | |
816 | ||
817 | /* Allocate and initialize a new session context. */ | |
309795f4 JC |
818 | session = l2tp_session_create(sizeof(struct pppol2tp_session), |
819 | tunnel, session_id, | |
820 | peer_session_id, cfg); | |
dbdbc73b GN |
821 | if (IS_ERR(session)) { |
822 | error = PTR_ERR(session); | |
309795f4 | 823 | goto out; |
dbdbc73b | 824 | } |
309795f4 JC |
825 | |
826 | ps = l2tp_session_priv(session); | |
827 | ps->tunnel_sock = tunnel->sock; | |
828 | ||
fba40c63 | 829 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: created\n", |
a4ca44fa | 830 | session->name); |
309795f4 JC |
831 | |
832 | error = 0; | |
833 | ||
834 | out: | |
835 | return error; | |
836 | } | |
837 | ||
309795f4 JC |
838 | #endif /* CONFIG_L2TP_V3 */ |
839 | ||
fd558d18 JC |
840 | /* getname() support. |
841 | */ | |
842 | static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr, | |
843 | int *usockaddr_len, int peer) | |
844 | { | |
e0d4435f | 845 | int len = 0; |
fd558d18 JC |
846 | int error = 0; |
847 | struct l2tp_session *session; | |
848 | struct l2tp_tunnel *tunnel; | |
849 | struct sock *sk = sock->sk; | |
850 | struct inet_sock *inet; | |
851 | struct pppol2tp_session *pls; | |
852 | ||
853 | error = -ENOTCONN; | |
854 | if (sk == NULL) | |
855 | goto end; | |
56cff471 | 856 | if (!(sk->sk_state & PPPOX_CONNECTED)) |
fd558d18 JC |
857 | goto end; |
858 | ||
859 | error = -EBADF; | |
860 | session = pppol2tp_sock_to_session(sk); | |
861 | if (session == NULL) | |
862 | goto end; | |
863 | ||
864 | pls = l2tp_session_priv(session); | |
865 | tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock); | |
4ac36a4a | 866 | if (tunnel == NULL) |
fd558d18 | 867 | goto end_put_sess; |
fd558d18 | 868 | |
bbdb32cb | 869 | inet = inet_sk(tunnel->sock); |
d2cf3361 | 870 | if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) { |
e0d4435f JC |
871 | struct sockaddr_pppol2tp sp; |
872 | len = sizeof(sp); | |
873 | memset(&sp, 0, len); | |
874 | sp.sa_family = AF_PPPOX; | |
875 | sp.sa_protocol = PX_PROTO_OL2TP; | |
876 | sp.pppol2tp.fd = tunnel->fd; | |
877 | sp.pppol2tp.pid = pls->owner; | |
878 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
879 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
880 | sp.pppol2tp.s_session = session->session_id; | |
881 | sp.pppol2tp.d_session = session->peer_session_id; | |
882 | sp.pppol2tp.addr.sin_family = AF_INET; | |
883 | sp.pppol2tp.addr.sin_port = inet->inet_dport; | |
884 | sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr; | |
885 | memcpy(uaddr, &sp, len); | |
d2cf3361 BL |
886 | #if IS_ENABLED(CONFIG_IPV6) |
887 | } else if ((tunnel->version == 2) && | |
888 | (tunnel->sock->sk_family == AF_INET6)) { | |
d2cf3361 | 889 | struct sockaddr_pppol2tpin6 sp; |
efe4208f | 890 | |
d2cf3361 BL |
891 | len = sizeof(sp); |
892 | memset(&sp, 0, len); | |
893 | sp.sa_family = AF_PPPOX; | |
894 | sp.sa_protocol = PX_PROTO_OL2TP; | |
895 | sp.pppol2tp.fd = tunnel->fd; | |
896 | sp.pppol2tp.pid = pls->owner; | |
897 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
898 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
899 | sp.pppol2tp.s_session = session->session_id; | |
900 | sp.pppol2tp.d_session = session->peer_session_id; | |
901 | sp.pppol2tp.addr.sin6_family = AF_INET6; | |
902 | sp.pppol2tp.addr.sin6_port = inet->inet_dport; | |
efe4208f ED |
903 | memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr, |
904 | sizeof(tunnel->sock->sk_v6_daddr)); | |
d2cf3361 BL |
905 | memcpy(uaddr, &sp, len); |
906 | } else if ((tunnel->version == 3) && | |
907 | (tunnel->sock->sk_family == AF_INET6)) { | |
d2cf3361 | 908 | struct sockaddr_pppol2tpv3in6 sp; |
efe4208f | 909 | |
d2cf3361 BL |
910 | len = sizeof(sp); |
911 | memset(&sp, 0, len); | |
912 | sp.sa_family = AF_PPPOX; | |
913 | sp.sa_protocol = PX_PROTO_OL2TP; | |
914 | sp.pppol2tp.fd = tunnel->fd; | |
915 | sp.pppol2tp.pid = pls->owner; | |
916 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
917 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
918 | sp.pppol2tp.s_session = session->session_id; | |
919 | sp.pppol2tp.d_session = session->peer_session_id; | |
920 | sp.pppol2tp.addr.sin6_family = AF_INET6; | |
921 | sp.pppol2tp.addr.sin6_port = inet->inet_dport; | |
efe4208f ED |
922 | memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr, |
923 | sizeof(tunnel->sock->sk_v6_daddr)); | |
d2cf3361 BL |
924 | memcpy(uaddr, &sp, len); |
925 | #endif | |
e0d4435f JC |
926 | } else if (tunnel->version == 3) { |
927 | struct sockaddr_pppol2tpv3 sp; | |
928 | len = sizeof(sp); | |
929 | memset(&sp, 0, len); | |
930 | sp.sa_family = AF_PPPOX; | |
931 | sp.sa_protocol = PX_PROTO_OL2TP; | |
932 | sp.pppol2tp.fd = tunnel->fd; | |
933 | sp.pppol2tp.pid = pls->owner; | |
934 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
935 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
936 | sp.pppol2tp.s_session = session->session_id; | |
937 | sp.pppol2tp.d_session = session->peer_session_id; | |
938 | sp.pppol2tp.addr.sin_family = AF_INET; | |
939 | sp.pppol2tp.addr.sin_port = inet->inet_dport; | |
940 | sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr; | |
941 | memcpy(uaddr, &sp, len); | |
942 | } | |
fd558d18 JC |
943 | |
944 | *usockaddr_len = len; | |
4ac36a4a | 945 | error = 0; |
fd558d18 JC |
946 | |
947 | sock_put(pls->tunnel_sock); | |
948 | end_put_sess: | |
949 | sock_put(sk); | |
fd558d18 JC |
950 | end: |
951 | return error; | |
952 | } | |
953 | ||
954 | /**************************************************************************** | |
955 | * ioctl() handlers. | |
956 | * | |
957 | * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP | |
958 | * sockets. However, in order to control kernel tunnel features, we allow | |
959 | * userspace to create a special "tunnel" PPPoX socket which is used for | |
960 | * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow | |
961 | * the user application to issue L2TP setsockopt(), getsockopt() and ioctl() | |
962 | * calls. | |
963 | ****************************************************************************/ | |
964 | ||
965 | static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest, | |
966 | struct l2tp_stats *stats) | |
967 | { | |
7b7c0719 TP |
968 | dest->tx_packets = atomic_long_read(&stats->tx_packets); |
969 | dest->tx_bytes = atomic_long_read(&stats->tx_bytes); | |
970 | dest->tx_errors = atomic_long_read(&stats->tx_errors); | |
971 | dest->rx_packets = atomic_long_read(&stats->rx_packets); | |
972 | dest->rx_bytes = atomic_long_read(&stats->rx_bytes); | |
973 | dest->rx_seq_discards = atomic_long_read(&stats->rx_seq_discards); | |
974 | dest->rx_oos_packets = atomic_long_read(&stats->rx_oos_packets); | |
975 | dest->rx_errors = atomic_long_read(&stats->rx_errors); | |
fd558d18 JC |
976 | } |
977 | ||
978 | /* Session ioctl helper. | |
979 | */ | |
980 | static int pppol2tp_session_ioctl(struct l2tp_session *session, | |
981 | unsigned int cmd, unsigned long arg) | |
982 | { | |
983 | struct ifreq ifr; | |
984 | int err = 0; | |
985 | struct sock *sk; | |
986 | int val = (int) arg; | |
987 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
988 | struct l2tp_tunnel *tunnel = session->tunnel; | |
989 | struct pppol2tp_ioc_stats stats; | |
990 | ||
fba40c63 | 991 | l2tp_dbg(session, L2TP_MSG_CONTROL, |
a4ca44fa JP |
992 | "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n", |
993 | session->name, cmd, arg); | |
fd558d18 JC |
994 | |
995 | sk = ps->sock; | |
996 | sock_hold(sk); | |
997 | ||
998 | switch (cmd) { | |
999 | case SIOCGIFMTU: | |
1000 | err = -ENXIO; | |
1001 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1002 | break; | |
1003 | ||
1004 | err = -EFAULT; | |
1005 | if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq))) | |
1006 | break; | |
1007 | ifr.ifr_mtu = session->mtu; | |
1008 | if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq))) | |
1009 | break; | |
1010 | ||
fba40c63 | 1011 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mtu=%d\n", |
a4ca44fa | 1012 | session->name, session->mtu); |
fd558d18 JC |
1013 | err = 0; |
1014 | break; | |
1015 | ||
1016 | case SIOCSIFMTU: | |
1017 | err = -ENXIO; | |
1018 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1019 | break; | |
1020 | ||
1021 | err = -EFAULT; | |
1022 | if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq))) | |
1023 | break; | |
1024 | ||
1025 | session->mtu = ifr.ifr_mtu; | |
1026 | ||
fba40c63 | 1027 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mtu=%d\n", |
a4ca44fa | 1028 | session->name, session->mtu); |
fd558d18 JC |
1029 | err = 0; |
1030 | break; | |
1031 | ||
1032 | case PPPIOCGMRU: | |
1033 | err = -ENXIO; | |
1034 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1035 | break; | |
1036 | ||
1037 | err = -EFAULT; | |
1038 | if (put_user(session->mru, (int __user *) arg)) | |
1039 | break; | |
1040 | ||
fba40c63 | 1041 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mru=%d\n", |
a4ca44fa | 1042 | session->name, session->mru); |
fd558d18 JC |
1043 | err = 0; |
1044 | break; | |
1045 | ||
1046 | case PPPIOCSMRU: | |
1047 | err = -ENXIO; | |
1048 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1049 | break; | |
1050 | ||
1051 | err = -EFAULT; | |
1052 | if (get_user(val, (int __user *) arg)) | |
1053 | break; | |
1054 | ||
1055 | session->mru = val; | |
fba40c63 | 1056 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mru=%d\n", |
a4ca44fa | 1057 | session->name, session->mru); |
fd558d18 JC |
1058 | err = 0; |
1059 | break; | |
1060 | ||
1061 | case PPPIOCGFLAGS: | |
1062 | err = -EFAULT; | |
1063 | if (put_user(ps->flags, (int __user *) arg)) | |
1064 | break; | |
1065 | ||
fba40c63 | 1066 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: get flags=%d\n", |
a4ca44fa | 1067 | session->name, ps->flags); |
fd558d18 JC |
1068 | err = 0; |
1069 | break; | |
1070 | ||
1071 | case PPPIOCSFLAGS: | |
1072 | err = -EFAULT; | |
1073 | if (get_user(val, (int __user *) arg)) | |
1074 | break; | |
1075 | ps->flags = val; | |
fba40c63 | 1076 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: set flags=%d\n", |
a4ca44fa | 1077 | session->name, ps->flags); |
fd558d18 JC |
1078 | err = 0; |
1079 | break; | |
1080 | ||
1081 | case PPPIOCGL2TPSTATS: | |
1082 | err = -ENXIO; | |
1083 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1084 | break; | |
1085 | ||
1086 | memset(&stats, 0, sizeof(stats)); | |
1087 | stats.tunnel_id = tunnel->tunnel_id; | |
1088 | stats.session_id = session->session_id; | |
1089 | pppol2tp_copy_stats(&stats, &session->stats); | |
1090 | if (copy_to_user((void __user *) arg, &stats, | |
1091 | sizeof(stats))) | |
1092 | break; | |
fba40c63 | 1093 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: get L2TP stats\n", |
a4ca44fa | 1094 | session->name); |
fd558d18 JC |
1095 | err = 0; |
1096 | break; | |
1097 | ||
1098 | default: | |
1099 | err = -ENOSYS; | |
1100 | break; | |
1101 | } | |
1102 | ||
1103 | sock_put(sk); | |
1104 | ||
1105 | return err; | |
1106 | } | |
1107 | ||
1108 | /* Tunnel ioctl helper. | |
1109 | * | |
1110 | * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data | |
1111 | * specifies a session_id, the session ioctl handler is called. This allows an | |
1112 | * application to retrieve session stats via a tunnel socket. | |
1113 | */ | |
1114 | static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel, | |
1115 | unsigned int cmd, unsigned long arg) | |
1116 | { | |
1117 | int err = 0; | |
1118 | struct sock *sk; | |
1119 | struct pppol2tp_ioc_stats stats; | |
1120 | ||
fba40c63 | 1121 | l2tp_dbg(tunnel, L2TP_MSG_CONTROL, |
a4ca44fa JP |
1122 | "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n", |
1123 | tunnel->name, cmd, arg); | |
fd558d18 JC |
1124 | |
1125 | sk = tunnel->sock; | |
1126 | sock_hold(sk); | |
1127 | ||
1128 | switch (cmd) { | |
1129 | case PPPIOCGL2TPSTATS: | |
1130 | err = -ENXIO; | |
1131 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1132 | break; | |
1133 | ||
1134 | if (copy_from_user(&stats, (void __user *) arg, | |
1135 | sizeof(stats))) { | |
1136 | err = -EFAULT; | |
1137 | break; | |
1138 | } | |
1139 | if (stats.session_id != 0) { | |
1140 | /* resend to session ioctl handler */ | |
1141 | struct l2tp_session *session = | |
57377d63 GN |
1142 | l2tp_session_get(sock_net(sk), tunnel, |
1143 | stats.session_id, true); | |
1144 | ||
1145 | if (session) { | |
1146 | err = pppol2tp_session_ioctl(session, cmd, | |
1147 | arg); | |
1148 | if (session->deref) | |
1149 | session->deref(session); | |
1150 | l2tp_session_dec_refcount(session); | |
1151 | } else { | |
fd558d18 | 1152 | err = -EBADR; |
57377d63 | 1153 | } |
fd558d18 JC |
1154 | break; |
1155 | } | |
1156 | #ifdef CONFIG_XFRM | |
1157 | stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0; | |
1158 | #endif | |
1159 | pppol2tp_copy_stats(&stats, &tunnel->stats); | |
1160 | if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) { | |
1161 | err = -EFAULT; | |
1162 | break; | |
1163 | } | |
fba40c63 | 1164 | l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get L2TP stats\n", |
a4ca44fa | 1165 | tunnel->name); |
fd558d18 JC |
1166 | err = 0; |
1167 | break; | |
1168 | ||
1169 | default: | |
1170 | err = -ENOSYS; | |
1171 | break; | |
1172 | } | |
1173 | ||
1174 | sock_put(sk); | |
1175 | ||
1176 | return err; | |
1177 | } | |
1178 | ||
1179 | /* Main ioctl() handler. | |
1180 | * Dispatch to tunnel or session helpers depending on the socket. | |
1181 | */ | |
1182 | static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd, | |
1183 | unsigned long arg) | |
1184 | { | |
1185 | struct sock *sk = sock->sk; | |
1186 | struct l2tp_session *session; | |
1187 | struct l2tp_tunnel *tunnel; | |
1188 | struct pppol2tp_session *ps; | |
1189 | int err; | |
1190 | ||
1191 | if (!sk) | |
1192 | return 0; | |
1193 | ||
1194 | err = -EBADF; | |
1195 | if (sock_flag(sk, SOCK_DEAD) != 0) | |
1196 | goto end; | |
1197 | ||
1198 | err = -ENOTCONN; | |
1199 | if ((sk->sk_user_data == NULL) || | |
1200 | (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)))) | |
1201 | goto end; | |
1202 | ||
1203 | /* Get session context from the socket */ | |
1204 | err = -EBADF; | |
1205 | session = pppol2tp_sock_to_session(sk); | |
1206 | if (session == NULL) | |
1207 | goto end; | |
1208 | ||
1209 | /* Special case: if session's session_id is zero, treat ioctl as a | |
1210 | * tunnel ioctl | |
1211 | */ | |
1212 | ps = l2tp_session_priv(session); | |
1213 | if ((session->session_id == 0) && | |
1214 | (session->peer_session_id == 0)) { | |
1215 | err = -EBADF; | |
1216 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
1217 | if (tunnel == NULL) | |
1218 | goto end_put_sess; | |
1219 | ||
1220 | err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg); | |
1221 | sock_put(ps->tunnel_sock); | |
1222 | goto end_put_sess; | |
1223 | } | |
1224 | ||
1225 | err = pppol2tp_session_ioctl(session, cmd, arg); | |
1226 | ||
1227 | end_put_sess: | |
1228 | sock_put(sk); | |
1229 | end: | |
1230 | return err; | |
1231 | } | |
1232 | ||
1233 | /***************************************************************************** | |
1234 | * setsockopt() / getsockopt() support. | |
1235 | * | |
1236 | * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP | |
1237 | * sockets. In order to control kernel tunnel features, we allow userspace to | |
1238 | * create a special "tunnel" PPPoX socket which is used for control only. | |
1239 | * Tunnel PPPoX sockets have session_id == 0 and simply allow the user | |
1240 | * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls. | |
1241 | *****************************************************************************/ | |
1242 | ||
1243 | /* Tunnel setsockopt() helper. | |
1244 | */ | |
1245 | static int pppol2tp_tunnel_setsockopt(struct sock *sk, | |
1246 | struct l2tp_tunnel *tunnel, | |
1247 | int optname, int val) | |
1248 | { | |
1249 | int err = 0; | |
1250 | ||
1251 | switch (optname) { | |
1252 | case PPPOL2TP_SO_DEBUG: | |
1253 | tunnel->debug = val; | |
fba40c63 | 1254 | l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: set debug=%x\n", |
a4ca44fa | 1255 | tunnel->name, tunnel->debug); |
fd558d18 JC |
1256 | break; |
1257 | ||
1258 | default: | |
1259 | err = -ENOPROTOOPT; | |
1260 | break; | |
1261 | } | |
1262 | ||
1263 | return err; | |
1264 | } | |
1265 | ||
1266 | /* Session setsockopt helper. | |
1267 | */ | |
1268 | static int pppol2tp_session_setsockopt(struct sock *sk, | |
1269 | struct l2tp_session *session, | |
1270 | int optname, int val) | |
1271 | { | |
1272 | int err = 0; | |
1273 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
1274 | ||
1275 | switch (optname) { | |
1276 | case PPPOL2TP_SO_RECVSEQ: | |
1277 | if ((val != 0) && (val != 1)) { | |
1278 | err = -EINVAL; | |
1279 | break; | |
1280 | } | |
3f9b9770 | 1281 | session->recv_seq = !!val; |
fba40c63 | 1282 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa JP |
1283 | "%s: set recv_seq=%d\n", |
1284 | session->name, session->recv_seq); | |
fd558d18 JC |
1285 | break; |
1286 | ||
1287 | case PPPOL2TP_SO_SENDSEQ: | |
1288 | if ((val != 0) && (val != 1)) { | |
1289 | err = -EINVAL; | |
1290 | break; | |
1291 | } | |
3f9b9770 | 1292 | session->send_seq = !!val; |
fd558d18 JC |
1293 | { |
1294 | struct sock *ssk = ps->sock; | |
1295 | struct pppox_sock *po = pppox_sk(ssk); | |
1296 | po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ : | |
1297 | PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
1298 | } | |
bb5016ea | 1299 | l2tp_session_set_header_len(session, session->tunnel->version); |
fba40c63 | 1300 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa JP |
1301 | "%s: set send_seq=%d\n", |
1302 | session->name, session->send_seq); | |
fd558d18 JC |
1303 | break; |
1304 | ||
1305 | case PPPOL2TP_SO_LNSMODE: | |
1306 | if ((val != 0) && (val != 1)) { | |
1307 | err = -EINVAL; | |
1308 | break; | |
1309 | } | |
3f9b9770 | 1310 | session->lns_mode = !!val; |
fba40c63 | 1311 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa JP |
1312 | "%s: set lns_mode=%d\n", |
1313 | session->name, session->lns_mode); | |
fd558d18 JC |
1314 | break; |
1315 | ||
1316 | case PPPOL2TP_SO_DEBUG: | |
1317 | session->debug = val; | |
fba40c63 | 1318 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: set debug=%x\n", |
a4ca44fa | 1319 | session->name, session->debug); |
fd558d18 JC |
1320 | break; |
1321 | ||
1322 | case PPPOL2TP_SO_REORDERTO: | |
1323 | session->reorder_timeout = msecs_to_jiffies(val); | |
fba40c63 | 1324 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa JP |
1325 | "%s: set reorder_timeout=%d\n", |
1326 | session->name, session->reorder_timeout); | |
fd558d18 JC |
1327 | break; |
1328 | ||
1329 | default: | |
1330 | err = -ENOPROTOOPT; | |
1331 | break; | |
1332 | } | |
1333 | ||
1334 | return err; | |
1335 | } | |
1336 | ||
1337 | /* Main setsockopt() entry point. | |
1338 | * Does API checks, then calls either the tunnel or session setsockopt | |
1339 | * handler, according to whether the PPPoL2TP socket is a for a regular | |
1340 | * session or the special tunnel type. | |
1341 | */ | |
1342 | static int pppol2tp_setsockopt(struct socket *sock, int level, int optname, | |
1343 | char __user *optval, unsigned int optlen) | |
1344 | { | |
1345 | struct sock *sk = sock->sk; | |
1346 | struct l2tp_session *session; | |
1347 | struct l2tp_tunnel *tunnel; | |
1348 | struct pppol2tp_session *ps; | |
1349 | int val; | |
1350 | int err; | |
1351 | ||
1352 | if (level != SOL_PPPOL2TP) | |
3cf521f7 | 1353 | return -EINVAL; |
fd558d18 JC |
1354 | |
1355 | if (optlen < sizeof(int)) | |
1356 | return -EINVAL; | |
1357 | ||
1358 | if (get_user(val, (int __user *)optval)) | |
1359 | return -EFAULT; | |
1360 | ||
1361 | err = -ENOTCONN; | |
1362 | if (sk->sk_user_data == NULL) | |
1363 | goto end; | |
1364 | ||
1365 | /* Get session context from the socket */ | |
1366 | err = -EBADF; | |
1367 | session = pppol2tp_sock_to_session(sk); | |
1368 | if (session == NULL) | |
1369 | goto end; | |
1370 | ||
1371 | /* Special case: if session_id == 0x0000, treat as operation on tunnel | |
1372 | */ | |
1373 | ps = l2tp_session_priv(session); | |
1374 | if ((session->session_id == 0) && | |
1375 | (session->peer_session_id == 0)) { | |
1376 | err = -EBADF; | |
1377 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
1378 | if (tunnel == NULL) | |
1379 | goto end_put_sess; | |
1380 | ||
1381 | err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val); | |
1382 | sock_put(ps->tunnel_sock); | |
1383 | } else | |
1384 | err = pppol2tp_session_setsockopt(sk, session, optname, val); | |
1385 | ||
1386 | err = 0; | |
1387 | ||
1388 | end_put_sess: | |
1389 | sock_put(sk); | |
1390 | end: | |
1391 | return err; | |
1392 | } | |
1393 | ||
1394 | /* Tunnel getsockopt helper. Called with sock locked. | |
1395 | */ | |
1396 | static int pppol2tp_tunnel_getsockopt(struct sock *sk, | |
1397 | struct l2tp_tunnel *tunnel, | |
1398 | int optname, int *val) | |
1399 | { | |
1400 | int err = 0; | |
1401 | ||
1402 | switch (optname) { | |
1403 | case PPPOL2TP_SO_DEBUG: | |
1404 | *val = tunnel->debug; | |
fba40c63 | 1405 | l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get debug=%x\n", |
a4ca44fa | 1406 | tunnel->name, tunnel->debug); |
fd558d18 JC |
1407 | break; |
1408 | ||
1409 | default: | |
1410 | err = -ENOPROTOOPT; | |
1411 | break; | |
1412 | } | |
1413 | ||
1414 | return err; | |
1415 | } | |
1416 | ||
1417 | /* Session getsockopt helper. Called with sock locked. | |
1418 | */ | |
1419 | static int pppol2tp_session_getsockopt(struct sock *sk, | |
1420 | struct l2tp_session *session, | |
1421 | int optname, int *val) | |
1422 | { | |
1423 | int err = 0; | |
1424 | ||
1425 | switch (optname) { | |
1426 | case PPPOL2TP_SO_RECVSEQ: | |
1427 | *val = session->recv_seq; | |
fba40c63 | 1428 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa | 1429 | "%s: get recv_seq=%d\n", session->name, *val); |
fd558d18 JC |
1430 | break; |
1431 | ||
1432 | case PPPOL2TP_SO_SENDSEQ: | |
1433 | *val = session->send_seq; | |
fba40c63 | 1434 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa | 1435 | "%s: get send_seq=%d\n", session->name, *val); |
fd558d18 JC |
1436 | break; |
1437 | ||
1438 | case PPPOL2TP_SO_LNSMODE: | |
1439 | *val = session->lns_mode; | |
fba40c63 | 1440 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa | 1441 | "%s: get lns_mode=%d\n", session->name, *val); |
fd558d18 JC |
1442 | break; |
1443 | ||
1444 | case PPPOL2TP_SO_DEBUG: | |
1445 | *val = session->debug; | |
fba40c63 | 1446 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: get debug=%d\n", |
a4ca44fa | 1447 | session->name, *val); |
fd558d18 JC |
1448 | break; |
1449 | ||
1450 | case PPPOL2TP_SO_REORDERTO: | |
1451 | *val = (int) jiffies_to_msecs(session->reorder_timeout); | |
fba40c63 | 1452 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa | 1453 | "%s: get reorder_timeout=%d\n", session->name, *val); |
fd558d18 JC |
1454 | break; |
1455 | ||
1456 | default: | |
1457 | err = -ENOPROTOOPT; | |
1458 | } | |
1459 | ||
1460 | return err; | |
1461 | } | |
1462 | ||
1463 | /* Main getsockopt() entry point. | |
1464 | * Does API checks, then calls either the tunnel or session getsockopt | |
1465 | * handler, according to whether the PPPoX socket is a for a regular session | |
1466 | * or the special tunnel type. | |
1467 | */ | |
e3192690 JP |
1468 | static int pppol2tp_getsockopt(struct socket *sock, int level, int optname, |
1469 | char __user *optval, int __user *optlen) | |
fd558d18 JC |
1470 | { |
1471 | struct sock *sk = sock->sk; | |
1472 | struct l2tp_session *session; | |
1473 | struct l2tp_tunnel *tunnel; | |
1474 | int val, len; | |
1475 | int err; | |
1476 | struct pppol2tp_session *ps; | |
1477 | ||
1478 | if (level != SOL_PPPOL2TP) | |
3cf521f7 | 1479 | return -EINVAL; |
fd558d18 | 1480 | |
e3192690 | 1481 | if (get_user(len, optlen)) |
fd558d18 JC |
1482 | return -EFAULT; |
1483 | ||
1484 | len = min_t(unsigned int, len, sizeof(int)); | |
1485 | ||
1486 | if (len < 0) | |
1487 | return -EINVAL; | |
1488 | ||
1489 | err = -ENOTCONN; | |
1490 | if (sk->sk_user_data == NULL) | |
1491 | goto end; | |
1492 | ||
1493 | /* Get the session context */ | |
1494 | err = -EBADF; | |
1495 | session = pppol2tp_sock_to_session(sk); | |
1496 | if (session == NULL) | |
1497 | goto end; | |
1498 | ||
1499 | /* Special case: if session_id == 0x0000, treat as operation on tunnel */ | |
1500 | ps = l2tp_session_priv(session); | |
1501 | if ((session->session_id == 0) && | |
1502 | (session->peer_session_id == 0)) { | |
1503 | err = -EBADF; | |
1504 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
1505 | if (tunnel == NULL) | |
1506 | goto end_put_sess; | |
1507 | ||
1508 | err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val); | |
1509 | sock_put(ps->tunnel_sock); | |
1510 | } else | |
1511 | err = pppol2tp_session_getsockopt(sk, session, optname, &val); | |
1512 | ||
1513 | err = -EFAULT; | |
e3192690 | 1514 | if (put_user(len, optlen)) |
fd558d18 JC |
1515 | goto end_put_sess; |
1516 | ||
1517 | if (copy_to_user((void __user *) optval, &val, len)) | |
1518 | goto end_put_sess; | |
1519 | ||
1520 | err = 0; | |
1521 | ||
1522 | end_put_sess: | |
1523 | sock_put(sk); | |
1524 | end: | |
1525 | return err; | |
1526 | } | |
1527 | ||
1528 | /***************************************************************************** | |
1529 | * /proc filesystem for debug | |
f7faffa3 JC |
1530 | * Since the original pppol2tp driver provided /proc/net/pppol2tp for |
1531 | * L2TPv2, we dump only L2TPv2 tunnels and sessions here. | |
fd558d18 JC |
1532 | *****************************************************************************/ |
1533 | ||
1534 | static unsigned int pppol2tp_net_id; | |
1535 | ||
1536 | #ifdef CONFIG_PROC_FS | |
1537 | ||
1538 | struct pppol2tp_seq_data { | |
1539 | struct seq_net_private p; | |
1540 | int tunnel_idx; /* current tunnel */ | |
1541 | int session_idx; /* index of session within current tunnel */ | |
1542 | struct l2tp_tunnel *tunnel; | |
1543 | struct l2tp_session *session; /* NULL means get next tunnel */ | |
1544 | }; | |
1545 | ||
1546 | static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd) | |
1547 | { | |
f7faffa3 JC |
1548 | for (;;) { |
1549 | pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx); | |
1550 | pd->tunnel_idx++; | |
1551 | ||
1552 | if (pd->tunnel == NULL) | |
1553 | break; | |
1554 | ||
1555 | /* Ignore L2TPv3 tunnels */ | |
1556 | if (pd->tunnel->version < 3) | |
1557 | break; | |
1558 | } | |
fd558d18 JC |
1559 | } |
1560 | ||
1561 | static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd) | |
1562 | { | |
e08293a4 | 1563 | pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx, true); |
fd558d18 | 1564 | pd->session_idx++; |
f7faffa3 | 1565 | |
fd558d18 JC |
1566 | if (pd->session == NULL) { |
1567 | pd->session_idx = 0; | |
1568 | pppol2tp_next_tunnel(net, pd); | |
1569 | } | |
1570 | } | |
1571 | ||
1572 | static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs) | |
1573 | { | |
1574 | struct pppol2tp_seq_data *pd = SEQ_START_TOKEN; | |
1575 | loff_t pos = *offs; | |
1576 | struct net *net; | |
1577 | ||
1578 | if (!pos) | |
1579 | goto out; | |
1580 | ||
1581 | BUG_ON(m->private == NULL); | |
1582 | pd = m->private; | |
1583 | net = seq_file_net(m); | |
1584 | ||
1585 | if (pd->tunnel == NULL) | |
1586 | pppol2tp_next_tunnel(net, pd); | |
1587 | else | |
1588 | pppol2tp_next_session(net, pd); | |
1589 | ||
1590 | /* NULL tunnel and session indicates end of list */ | |
1591 | if ((pd->tunnel == NULL) && (pd->session == NULL)) | |
1592 | pd = NULL; | |
1593 | ||
1594 | out: | |
1595 | return pd; | |
1596 | } | |
1597 | ||
1598 | static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
1599 | { | |
1600 | (*pos)++; | |
1601 | return NULL; | |
1602 | } | |
1603 | ||
1604 | static void pppol2tp_seq_stop(struct seq_file *p, void *v) | |
1605 | { | |
1606 | /* nothing to do */ | |
1607 | } | |
1608 | ||
1609 | static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v) | |
1610 | { | |
1611 | struct l2tp_tunnel *tunnel = v; | |
1612 | ||
1613 | seq_printf(m, "\nTUNNEL '%s', %c %d\n", | |
1614 | tunnel->name, | |
1615 | (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N', | |
1616 | atomic_read(&tunnel->ref_count) - 1); | |
7b7c0719 | 1617 | seq_printf(m, " %08x %ld/%ld/%ld %ld/%ld/%ld\n", |
fd558d18 | 1618 | tunnel->debug, |
7b7c0719 TP |
1619 | atomic_long_read(&tunnel->stats.tx_packets), |
1620 | atomic_long_read(&tunnel->stats.tx_bytes), | |
1621 | atomic_long_read(&tunnel->stats.tx_errors), | |
1622 | atomic_long_read(&tunnel->stats.rx_packets), | |
1623 | atomic_long_read(&tunnel->stats.rx_bytes), | |
1624 | atomic_long_read(&tunnel->stats.rx_errors)); | |
fd558d18 JC |
1625 | } |
1626 | ||
1627 | static void pppol2tp_seq_session_show(struct seq_file *m, void *v) | |
1628 | { | |
1629 | struct l2tp_session *session = v; | |
1630 | struct l2tp_tunnel *tunnel = session->tunnel; | |
1631 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
9345471b | 1632 | struct pppox_sock *po = pppox_sk(ps->sock); |
fd558d18 JC |
1633 | u32 ip = 0; |
1634 | u16 port = 0; | |
1635 | ||
1636 | if (tunnel->sock) { | |
1637 | struct inet_sock *inet = inet_sk(tunnel->sock); | |
1638 | ip = ntohl(inet->inet_saddr); | |
1639 | port = ntohs(inet->inet_sport); | |
1640 | } | |
1641 | ||
1642 | seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> " | |
1643 | "%04X/%04X %d %c\n", | |
1644 | session->name, ip, port, | |
1645 | tunnel->tunnel_id, | |
1646 | session->session_id, | |
1647 | tunnel->peer_tunnel_id, | |
1648 | session->peer_session_id, | |
1649 | ps->sock->sk_state, | |
1650 | (session == ps->sock->sk_user_data) ? | |
1651 | 'Y' : 'N'); | |
1652 | seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n", | |
1653 | session->mtu, session->mru, | |
1654 | session->recv_seq ? 'R' : '-', | |
1655 | session->send_seq ? 'S' : '-', | |
1656 | session->lns_mode ? "LNS" : "LAC", | |
1657 | session->debug, | |
1658 | jiffies_to_msecs(session->reorder_timeout)); | |
7b7c0719 | 1659 | seq_printf(m, " %hu/%hu %ld/%ld/%ld %ld/%ld/%ld\n", |
fd558d18 | 1660 | session->nr, session->ns, |
7b7c0719 TP |
1661 | atomic_long_read(&session->stats.tx_packets), |
1662 | atomic_long_read(&session->stats.tx_bytes), | |
1663 | atomic_long_read(&session->stats.tx_errors), | |
1664 | atomic_long_read(&session->stats.rx_packets), | |
1665 | atomic_long_read(&session->stats.rx_bytes), | |
1666 | atomic_long_read(&session->stats.rx_errors)); | |
9345471b JC |
1667 | |
1668 | if (po) | |
1669 | seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan)); | |
fd558d18 JC |
1670 | } |
1671 | ||
1672 | static int pppol2tp_seq_show(struct seq_file *m, void *v) | |
1673 | { | |
1674 | struct pppol2tp_seq_data *pd = v; | |
1675 | ||
1676 | /* display header on line 1 */ | |
1677 | if (v == SEQ_START_TOKEN) { | |
1678 | seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n"); | |
1679 | seq_puts(m, "TUNNEL name, user-data-ok session-count\n"); | |
1680 | seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
1681 | seq_puts(m, " SESSION name, addr/port src-tid/sid " | |
1682 | "dest-tid/sid state user-data-ok\n"); | |
1683 | seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n"); | |
1684 | seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
1685 | goto out; | |
1686 | } | |
1687 | ||
1688 | /* Show the tunnel or session context. | |
1689 | */ | |
e08293a4 | 1690 | if (!pd->session) { |
fd558d18 | 1691 | pppol2tp_seq_tunnel_show(m, pd->tunnel); |
e08293a4 | 1692 | } else { |
fd558d18 | 1693 | pppol2tp_seq_session_show(m, pd->session); |
e08293a4 GN |
1694 | if (pd->session->deref) |
1695 | pd->session->deref(pd->session); | |
1696 | l2tp_session_dec_refcount(pd->session); | |
1697 | } | |
fd558d18 JC |
1698 | |
1699 | out: | |
1700 | return 0; | |
1701 | } | |
1702 | ||
1703 | static const struct seq_operations pppol2tp_seq_ops = { | |
1704 | .start = pppol2tp_seq_start, | |
1705 | .next = pppol2tp_seq_next, | |
1706 | .stop = pppol2tp_seq_stop, | |
1707 | .show = pppol2tp_seq_show, | |
1708 | }; | |
1709 | ||
1710 | /* Called when our /proc file is opened. We allocate data for use when | |
1711 | * iterating our tunnel / session contexts and store it in the private | |
1712 | * data of the seq_file. | |
1713 | */ | |
1714 | static int pppol2tp_proc_open(struct inode *inode, struct file *file) | |
1715 | { | |
1716 | return seq_open_net(inode, file, &pppol2tp_seq_ops, | |
1717 | sizeof(struct pppol2tp_seq_data)); | |
1718 | } | |
1719 | ||
1720 | static const struct file_operations pppol2tp_proc_fops = { | |
1721 | .owner = THIS_MODULE, | |
1722 | .open = pppol2tp_proc_open, | |
1723 | .read = seq_read, | |
1724 | .llseek = seq_lseek, | |
1725 | .release = seq_release_net, | |
1726 | }; | |
1727 | ||
1728 | #endif /* CONFIG_PROC_FS */ | |
1729 | ||
1730 | /***************************************************************************** | |
1731 | * Network namespace | |
1732 | *****************************************************************************/ | |
1733 | ||
1734 | static __net_init int pppol2tp_init_net(struct net *net) | |
1735 | { | |
1736 | struct proc_dir_entry *pde; | |
1737 | int err = 0; | |
1738 | ||
d4beaa66 G |
1739 | pde = proc_create("pppol2tp", S_IRUGO, net->proc_net, |
1740 | &pppol2tp_proc_fops); | |
fd558d18 JC |
1741 | if (!pde) { |
1742 | err = -ENOMEM; | |
1743 | goto out; | |
1744 | } | |
1745 | ||
1746 | out: | |
1747 | return err; | |
1748 | } | |
1749 | ||
1750 | static __net_exit void pppol2tp_exit_net(struct net *net) | |
1751 | { | |
ece31ffd | 1752 | remove_proc_entry("pppol2tp", net->proc_net); |
fd558d18 JC |
1753 | } |
1754 | ||
1755 | static struct pernet_operations pppol2tp_net_ops = { | |
1756 | .init = pppol2tp_init_net, | |
1757 | .exit = pppol2tp_exit_net, | |
1758 | .id = &pppol2tp_net_id, | |
1759 | }; | |
1760 | ||
1761 | /***************************************************************************** | |
1762 | * Init and cleanup | |
1763 | *****************************************************************************/ | |
1764 | ||
1765 | static const struct proto_ops pppol2tp_ops = { | |
1766 | .family = AF_PPPOX, | |
1767 | .owner = THIS_MODULE, | |
1768 | .release = pppol2tp_release, | |
1769 | .bind = sock_no_bind, | |
1770 | .connect = pppol2tp_connect, | |
1771 | .socketpair = sock_no_socketpair, | |
1772 | .accept = sock_no_accept, | |
1773 | .getname = pppol2tp_getname, | |
1774 | .poll = datagram_poll, | |
1775 | .listen = sock_no_listen, | |
1776 | .shutdown = sock_no_shutdown, | |
1777 | .setsockopt = pppol2tp_setsockopt, | |
1778 | .getsockopt = pppol2tp_getsockopt, | |
1779 | .sendmsg = pppol2tp_sendmsg, | |
1780 | .recvmsg = pppol2tp_recvmsg, | |
1781 | .mmap = sock_no_mmap, | |
1782 | .ioctl = pppox_ioctl, | |
1783 | }; | |
1784 | ||
756e64a0 | 1785 | static const struct pppox_proto pppol2tp_proto = { |
fd558d18 | 1786 | .create = pppol2tp_create, |
e1558a93 WY |
1787 | .ioctl = pppol2tp_ioctl, |
1788 | .owner = THIS_MODULE, | |
fd558d18 JC |
1789 | }; |
1790 | ||
309795f4 JC |
1791 | #ifdef CONFIG_L2TP_V3 |
1792 | ||
1793 | static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = { | |
1794 | .session_create = pppol2tp_session_create, | |
cf2f5c88 | 1795 | .session_delete = l2tp_session_delete, |
309795f4 JC |
1796 | }; |
1797 | ||
1798 | #endif /* CONFIG_L2TP_V3 */ | |
1799 | ||
fd558d18 JC |
1800 | static int __init pppol2tp_init(void) |
1801 | { | |
1802 | int err; | |
1803 | ||
1804 | err = register_pernet_device(&pppol2tp_net_ops); | |
1805 | if (err) | |
1806 | goto out; | |
1807 | ||
1808 | err = proto_register(&pppol2tp_sk_proto, 0); | |
1809 | if (err) | |
1810 | goto out_unregister_pppol2tp_pernet; | |
1811 | ||
1812 | err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto); | |
1813 | if (err) | |
1814 | goto out_unregister_pppol2tp_proto; | |
1815 | ||
309795f4 JC |
1816 | #ifdef CONFIG_L2TP_V3 |
1817 | err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops); | |
1818 | if (err) | |
1819 | goto out_unregister_pppox; | |
1820 | #endif | |
1821 | ||
a4ca44fa | 1822 | pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION); |
fd558d18 JC |
1823 | |
1824 | out: | |
1825 | return err; | |
309795f4 JC |
1826 | |
1827 | #ifdef CONFIG_L2TP_V3 | |
1828 | out_unregister_pppox: | |
1829 | unregister_pppox_proto(PX_PROTO_OL2TP); | |
1830 | #endif | |
fd558d18 JC |
1831 | out_unregister_pppol2tp_proto: |
1832 | proto_unregister(&pppol2tp_sk_proto); | |
1833 | out_unregister_pppol2tp_pernet: | |
1834 | unregister_pernet_device(&pppol2tp_net_ops); | |
1835 | goto out; | |
1836 | } | |
1837 | ||
1838 | static void __exit pppol2tp_exit(void) | |
1839 | { | |
309795f4 JC |
1840 | #ifdef CONFIG_L2TP_V3 |
1841 | l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP); | |
1842 | #endif | |
fd558d18 JC |
1843 | unregister_pppox_proto(PX_PROTO_OL2TP); |
1844 | proto_unregister(&pppol2tp_sk_proto); | |
1845 | unregister_pernet_device(&pppol2tp_net_ops); | |
1846 | } | |
1847 | ||
1848 | module_init(pppol2tp_init); | |
1849 | module_exit(pppol2tp_exit); | |
1850 | ||
1851 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); | |
1852 | MODULE_DESCRIPTION("PPP over L2TP over UDP"); | |
1853 | MODULE_LICENSE("GPL"); | |
1854 | MODULE_VERSION(PPPOL2TP_DRV_VERSION); | |
681b4d88 | 1855 | MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_OL2TP); |
249ee819 | 1856 | MODULE_ALIAS_L2TP_PWTYPE(7); |