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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> | |
100 | ||
101 | #include <asm/byteorder.h> | |
60063497 | 102 | #include <linux/atomic.h> |
fd558d18 JC |
103 | |
104 | #include "l2tp_core.h" | |
105 | ||
106 | #define PPPOL2TP_DRV_VERSION "V2.0" | |
107 | ||
108 | /* Space for UDP, L2TP and PPP headers */ | |
109 | #define PPPOL2TP_HEADER_OVERHEAD 40 | |
110 | ||
fd558d18 JC |
111 | /* Number of bytes to build transmit L2TP headers. |
112 | * Unfortunately the size is different depending on whether sequence numbers | |
113 | * are enabled. | |
114 | */ | |
115 | #define PPPOL2TP_L2TP_HDR_SIZE_SEQ 10 | |
116 | #define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ 6 | |
117 | ||
118 | /* Private data of each session. This data lives at the end of struct | |
119 | * l2tp_session, referenced via session->priv[]. | |
120 | */ | |
121 | struct pppol2tp_session { | |
122 | int owner; /* pid that opened the socket */ | |
123 | ||
124 | struct sock *sock; /* Pointer to the session | |
125 | * PPPoX socket */ | |
126 | struct sock *tunnel_sock; /* Pointer to the tunnel UDP | |
127 | * socket */ | |
128 | int flags; /* accessed by PPPIOCGFLAGS. | |
129 | * Unused. */ | |
130 | }; | |
131 | ||
132 | static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb); | |
133 | ||
d7100da0 | 134 | static const struct ppp_channel_ops pppol2tp_chan_ops = { |
135 | .start_xmit = pppol2tp_xmit, | |
136 | }; | |
137 | ||
fd558d18 JC |
138 | static const struct proto_ops pppol2tp_ops; |
139 | ||
140 | /* Helpers to obtain tunnel/session contexts from sockets. | |
141 | */ | |
142 | static inline struct l2tp_session *pppol2tp_sock_to_session(struct sock *sk) | |
143 | { | |
144 | struct l2tp_session *session; | |
145 | ||
146 | if (sk == NULL) | |
147 | return NULL; | |
148 | ||
149 | sock_hold(sk); | |
150 | session = (struct l2tp_session *)(sk->sk_user_data); | |
151 | if (session == NULL) { | |
152 | sock_put(sk); | |
153 | goto out; | |
154 | } | |
155 | ||
156 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
157 | ||
158 | out: | |
159 | return session; | |
160 | } | |
161 | ||
162 | /***************************************************************************** | |
163 | * Receive data handling | |
164 | *****************************************************************************/ | |
165 | ||
166 | static int pppol2tp_recv_payload_hook(struct sk_buff *skb) | |
167 | { | |
168 | /* Skip PPP header, if present. In testing, Microsoft L2TP clients | |
169 | * don't send the PPP header (PPP header compression enabled), but | |
170 | * other clients can include the header. So we cope with both cases | |
171 | * here. The PPP header is always FF03 when using L2TP. | |
172 | * | |
173 | * Note that skb->data[] isn't dereferenced from a u16 ptr here since | |
174 | * the field may be unaligned. | |
175 | */ | |
176 | if (!pskb_may_pull(skb, 2)) | |
177 | return 1; | |
178 | ||
179 | if ((skb->data[0] == 0xff) && (skb->data[1] == 0x03)) | |
180 | skb_pull(skb, 2); | |
181 | ||
182 | return 0; | |
183 | } | |
184 | ||
185 | /* Receive message. This is the recvmsg for the PPPoL2TP socket. | |
186 | */ | |
187 | static int pppol2tp_recvmsg(struct kiocb *iocb, struct socket *sock, | |
188 | struct msghdr *msg, size_t len, | |
189 | int flags) | |
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 | ||
199 | msg->msg_namelen = 0; | |
200 | ||
201 | err = 0; | |
202 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
203 | flags & MSG_DONTWAIT, &err); | |
204 | if (!skb) | |
205 | goto end; | |
206 | ||
207 | if (len > skb->len) | |
208 | len = skb->len; | |
209 | else if (len < skb->len) | |
210 | msg->msg_flags |= MSG_TRUNC; | |
211 | ||
212 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len); | |
213 | if (likely(err == 0)) | |
214 | err = len; | |
215 | ||
216 | kfree_skb(skb); | |
217 | end: | |
218 | return err; | |
219 | } | |
220 | ||
221 | static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len) | |
222 | { | |
223 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
224 | struct sock *sk = NULL; | |
225 | ||
226 | /* If the socket is bound, send it in to PPP's input queue. Otherwise | |
227 | * queue it on the session socket. | |
228 | */ | |
229 | sk = ps->sock; | |
230 | if (sk == NULL) | |
231 | goto no_sock; | |
232 | ||
233 | if (sk->sk_state & PPPOX_BOUND) { | |
234 | struct pppox_sock *po; | |
a4ca44fa JP |
235 | l2tp_dbg(session, PPPOL2TP_MSG_DATA, |
236 | "%s: recv %d byte data frame, passing to ppp\n", | |
237 | session->name, data_len); | |
fd558d18 JC |
238 | |
239 | /* We need to forget all info related to the L2TP packet | |
240 | * gathered in the skb as we are going to reuse the same | |
241 | * skb for the inner packet. | |
242 | * Namely we need to: | |
243 | * - reset xfrm (IPSec) information as it applies to | |
244 | * the outer L2TP packet and not to the inner one | |
245 | * - release the dst to force a route lookup on the inner | |
246 | * IP packet since skb->dst currently points to the dst | |
247 | * of the UDP tunnel | |
248 | * - reset netfilter information as it doesn't apply | |
249 | * to the inner packet either | |
250 | */ | |
251 | secpath_reset(skb); | |
252 | skb_dst_drop(skb); | |
253 | nf_reset(skb); | |
254 | ||
255 | po = pppox_sk(sk); | |
256 | ppp_input(&po->chan, skb); | |
257 | } else { | |
a4ca44fa JP |
258 | l2tp_info(session, PPPOL2TP_MSG_DATA, "%s: socket not bound\n", |
259 | session->name); | |
fd558d18 JC |
260 | |
261 | /* Not bound. Nothing we can do, so discard. */ | |
262 | session->stats.rx_errors++; | |
263 | kfree_skb(skb); | |
264 | } | |
265 | ||
266 | return; | |
267 | ||
268 | no_sock: | |
a4ca44fa | 269 | l2tp_info(session, PPPOL2TP_MSG_DATA, "%s: no socket\n", session->name); |
fd558d18 JC |
270 | kfree_skb(skb); |
271 | } | |
272 | ||
273 | static void pppol2tp_session_sock_hold(struct l2tp_session *session) | |
274 | { | |
275 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
276 | ||
277 | if (ps->sock) | |
278 | sock_hold(ps->sock); | |
279 | } | |
280 | ||
281 | static void pppol2tp_session_sock_put(struct l2tp_session *session) | |
282 | { | |
283 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
284 | ||
285 | if (ps->sock) | |
286 | sock_put(ps->sock); | |
287 | } | |
288 | ||
289 | /************************************************************************ | |
290 | * Transmit handling | |
291 | ***********************************************************************/ | |
292 | ||
fd558d18 JC |
293 | /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here |
294 | * when a user application does a sendmsg() on the session socket. L2TP and | |
295 | * PPP headers must be inserted into the user's data. | |
296 | */ | |
297 | static int pppol2tp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
298 | size_t total_len) | |
299 | { | |
300 | static const unsigned char ppph[2] = { 0xff, 0x03 }; | |
301 | struct sock *sk = sock->sk; | |
302 | struct sk_buff *skb; | |
303 | int error; | |
304 | struct l2tp_session *session; | |
305 | struct l2tp_tunnel *tunnel; | |
306 | struct pppol2tp_session *ps; | |
0d76751f | 307 | int uhlen; |
fd558d18 JC |
308 | |
309 | error = -ENOTCONN; | |
310 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
311 | goto error; | |
312 | ||
313 | /* Get session and tunnel contexts */ | |
314 | error = -EBADF; | |
315 | session = pppol2tp_sock_to_session(sk); | |
316 | if (session == NULL) | |
317 | goto error; | |
318 | ||
319 | ps = l2tp_session_priv(session); | |
320 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
321 | if (tunnel == NULL) | |
322 | goto error_put_sess; | |
323 | ||
0d76751f JC |
324 | uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0; |
325 | ||
fd558d18 JC |
326 | /* Allocate a socket buffer */ |
327 | error = -ENOMEM; | |
328 | skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) + | |
0d76751f | 329 | uhlen + session->hdr_len + |
fd558d18 JC |
330 | sizeof(ppph) + total_len, |
331 | 0, GFP_KERNEL); | |
332 | if (!skb) | |
333 | goto error_put_sess_tun; | |
334 | ||
335 | /* Reserve space for headers. */ | |
336 | skb_reserve(skb, NET_SKB_PAD); | |
337 | skb_reset_network_header(skb); | |
338 | skb_reserve(skb, sizeof(struct iphdr)); | |
339 | skb_reset_transport_header(skb); | |
0d76751f | 340 | skb_reserve(skb, uhlen); |
fd558d18 JC |
341 | |
342 | /* Add PPP header */ | |
343 | skb->data[0] = ppph[0]; | |
344 | skb->data[1] = ppph[1]; | |
345 | skb_put(skb, 2); | |
346 | ||
347 | /* Copy user data into skb */ | |
348 | error = memcpy_fromiovec(skb->data, m->msg_iov, total_len); | |
349 | if (error < 0) { | |
350 | kfree_skb(skb); | |
351 | goto error_put_sess_tun; | |
352 | } | |
353 | skb_put(skb, total_len); | |
354 | ||
355 | l2tp_xmit_skb(session, skb, session->hdr_len); | |
356 | ||
357 | sock_put(ps->tunnel_sock); | |
358 | ||
359 | return error; | |
360 | ||
361 | error_put_sess_tun: | |
362 | sock_put(ps->tunnel_sock); | |
363 | error_put_sess: | |
364 | sock_put(sk); | |
365 | error: | |
366 | return error; | |
367 | } | |
368 | ||
369 | /* Transmit function called by generic PPP driver. Sends PPP frame | |
370 | * over PPPoL2TP socket. | |
371 | * | |
372 | * This is almost the same as pppol2tp_sendmsg(), but rather than | |
373 | * being called with a msghdr from userspace, it is called with a skb | |
374 | * from the kernel. | |
375 | * | |
376 | * The supplied skb from ppp doesn't have enough headroom for the | |
377 | * insertion of L2TP, UDP and IP headers so we need to allocate more | |
378 | * headroom in the skb. This will create a cloned skb. But we must be | |
379 | * careful in the error case because the caller will expect to free | |
380 | * the skb it supplied, not our cloned skb. So we take care to always | |
381 | * leave the original skb unfreed if we return an error. | |
382 | */ | |
383 | static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb) | |
384 | { | |
385 | static const u8 ppph[2] = { 0xff, 0x03 }; | |
386 | struct sock *sk = (struct sock *) chan->private; | |
387 | struct sock *sk_tun; | |
fd558d18 JC |
388 | struct l2tp_session *session; |
389 | struct l2tp_tunnel *tunnel; | |
390 | struct pppol2tp_session *ps; | |
09df57ca | 391 | int uhlen, headroom; |
fd558d18 JC |
392 | |
393 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
394 | goto abort; | |
395 | ||
396 | /* Get session and tunnel contexts from the socket */ | |
397 | session = pppol2tp_sock_to_session(sk); | |
398 | if (session == NULL) | |
399 | goto abort; | |
400 | ||
401 | ps = l2tp_session_priv(session); | |
402 | sk_tun = ps->tunnel_sock; | |
403 | if (sk_tun == NULL) | |
404 | goto abort_put_sess; | |
405 | tunnel = l2tp_sock_to_tunnel(sk_tun); | |
406 | if (tunnel == NULL) | |
407 | goto abort_put_sess; | |
408 | ||
09df57ca ED |
409 | uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0; |
410 | headroom = NET_SKB_PAD + | |
411 | sizeof(struct iphdr) + /* IP header */ | |
412 | uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */ | |
413 | session->hdr_len + /* L2TP header */ | |
414 | sizeof(ppph); /* PPP header */ | |
415 | if (skb_cow_head(skb, headroom)) | |
fd558d18 JC |
416 | goto abort_put_sess_tun; |
417 | ||
fd558d18 JC |
418 | /* Setup PPP header */ |
419 | __skb_push(skb, sizeof(ppph)); | |
420 | skb->data[0] = ppph[0]; | |
421 | skb->data[1] = ppph[1]; | |
422 | ||
e0d4435f | 423 | l2tp_xmit_skb(session, skb, session->hdr_len); |
fd558d18 JC |
424 | |
425 | sock_put(sk_tun); | |
426 | sock_put(sk); | |
427 | return 1; | |
428 | ||
429 | abort_put_sess_tun: | |
430 | sock_put(sk_tun); | |
431 | abort_put_sess: | |
432 | sock_put(sk); | |
433 | abort: | |
434 | /* Free the original skb */ | |
435 | kfree_skb(skb); | |
436 | return 1; | |
437 | } | |
438 | ||
439 | /***************************************************************************** | |
440 | * Session (and tunnel control) socket create/destroy. | |
441 | *****************************************************************************/ | |
442 | ||
443 | /* Called by l2tp_core when a session socket is being closed. | |
444 | */ | |
445 | static void pppol2tp_session_close(struct l2tp_session *session) | |
446 | { | |
447 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
448 | struct sock *sk = ps->sock; | |
449 | struct sk_buff *skb; | |
450 | ||
451 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
452 | ||
453 | if (session->session_id == 0) | |
454 | goto out; | |
455 | ||
456 | if (sk != NULL) { | |
457 | lock_sock(sk); | |
458 | ||
459 | if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) { | |
460 | pppox_unbind_sock(sk); | |
461 | sk->sk_state = PPPOX_DEAD; | |
462 | sk->sk_state_change(sk); | |
463 | } | |
464 | ||
465 | /* Purge any queued data */ | |
466 | skb_queue_purge(&sk->sk_receive_queue); | |
467 | skb_queue_purge(&sk->sk_write_queue); | |
468 | while ((skb = skb_dequeue(&session->reorder_q))) { | |
469 | kfree_skb(skb); | |
470 | sock_put(sk); | |
471 | } | |
472 | ||
473 | release_sock(sk); | |
474 | } | |
475 | ||
476 | out: | |
477 | return; | |
478 | } | |
479 | ||
480 | /* Really kill the session socket. (Called from sock_put() if | |
481 | * refcnt == 0.) | |
482 | */ | |
483 | static void pppol2tp_session_destruct(struct sock *sk) | |
484 | { | |
485 | struct l2tp_session *session; | |
486 | ||
487 | if (sk->sk_user_data != NULL) { | |
488 | session = sk->sk_user_data; | |
489 | if (session == NULL) | |
490 | goto out; | |
491 | ||
492 | sk->sk_user_data = NULL; | |
493 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
494 | l2tp_session_dec_refcount(session); | |
495 | } | |
496 | ||
497 | out: | |
498 | return; | |
499 | } | |
500 | ||
501 | /* Called when the PPPoX socket (session) is closed. | |
502 | */ | |
503 | static int pppol2tp_release(struct socket *sock) | |
504 | { | |
505 | struct sock *sk = sock->sk; | |
506 | struct l2tp_session *session; | |
507 | int error; | |
508 | ||
509 | if (!sk) | |
510 | return 0; | |
511 | ||
512 | error = -EBADF; | |
513 | lock_sock(sk); | |
514 | if (sock_flag(sk, SOCK_DEAD) != 0) | |
515 | goto error; | |
516 | ||
517 | pppox_unbind_sock(sk); | |
518 | ||
519 | /* Signal the death of the socket. */ | |
520 | sk->sk_state = PPPOX_DEAD; | |
521 | sock_orphan(sk); | |
522 | sock->sk = NULL; | |
523 | ||
524 | session = pppol2tp_sock_to_session(sk); | |
525 | ||
526 | /* Purge any queued data */ | |
527 | skb_queue_purge(&sk->sk_receive_queue); | |
528 | skb_queue_purge(&sk->sk_write_queue); | |
529 | if (session != NULL) { | |
530 | struct sk_buff *skb; | |
531 | while ((skb = skb_dequeue(&session->reorder_q))) { | |
532 | kfree_skb(skb); | |
533 | sock_put(sk); | |
534 | } | |
535 | sock_put(sk); | |
536 | } | |
537 | ||
538 | release_sock(sk); | |
539 | ||
540 | /* This will delete the session context via | |
541 | * pppol2tp_session_destruct() if the socket's refcnt drops to | |
542 | * zero. | |
543 | */ | |
544 | sock_put(sk); | |
545 | ||
546 | return 0; | |
547 | ||
548 | error: | |
549 | release_sock(sk); | |
550 | return error; | |
551 | } | |
552 | ||
553 | static struct proto pppol2tp_sk_proto = { | |
554 | .name = "PPPOL2TP", | |
555 | .owner = THIS_MODULE, | |
556 | .obj_size = sizeof(struct pppox_sock), | |
557 | }; | |
558 | ||
559 | static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb) | |
560 | { | |
561 | int rc; | |
562 | ||
563 | rc = l2tp_udp_encap_recv(sk, skb); | |
564 | if (rc) | |
565 | kfree_skb(skb); | |
566 | ||
567 | return NET_RX_SUCCESS; | |
568 | } | |
569 | ||
570 | /* socket() handler. Initialize a new struct sock. | |
571 | */ | |
572 | static int pppol2tp_create(struct net *net, struct socket *sock) | |
573 | { | |
574 | int error = -ENOMEM; | |
575 | struct sock *sk; | |
576 | ||
577 | sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto); | |
578 | if (!sk) | |
579 | goto out; | |
580 | ||
581 | sock_init_data(sock, sk); | |
582 | ||
583 | sock->state = SS_UNCONNECTED; | |
584 | sock->ops = &pppol2tp_ops; | |
585 | ||
586 | sk->sk_backlog_rcv = pppol2tp_backlog_recv; | |
587 | sk->sk_protocol = PX_PROTO_OL2TP; | |
588 | sk->sk_family = PF_PPPOX; | |
589 | sk->sk_state = PPPOX_NONE; | |
590 | sk->sk_type = SOCK_STREAM; | |
591 | sk->sk_destruct = pppol2tp_session_destruct; | |
592 | ||
593 | error = 0; | |
594 | ||
595 | out: | |
596 | return error; | |
597 | } | |
598 | ||
f66ef2d0 | 599 | #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE) |
0ad66140 JC |
600 | static void pppol2tp_show(struct seq_file *m, void *arg) |
601 | { | |
602 | struct l2tp_session *session = arg; | |
603 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
604 | ||
605 | if (ps) { | |
606 | struct pppox_sock *po = pppox_sk(ps->sock); | |
607 | if (po) | |
608 | seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan)); | |
609 | } | |
610 | } | |
611 | #endif | |
612 | ||
fd558d18 JC |
613 | /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket |
614 | */ | |
615 | static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr, | |
616 | int sockaddr_len, int flags) | |
617 | { | |
618 | struct sock *sk = sock->sk; | |
619 | struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr; | |
620 | struct pppox_sock *po = pppox_sk(sk); | |
621 | struct l2tp_session *session = NULL; | |
622 | struct l2tp_tunnel *tunnel; | |
623 | struct pppol2tp_session *ps; | |
624 | struct dst_entry *dst; | |
625 | struct l2tp_session_cfg cfg = { 0, }; | |
626 | int error = 0; | |
e0d4435f JC |
627 | u32 tunnel_id, peer_tunnel_id; |
628 | u32 session_id, peer_session_id; | |
629 | int ver = 2; | |
630 | int fd; | |
fd558d18 JC |
631 | |
632 | lock_sock(sk); | |
633 | ||
634 | error = -EINVAL; | |
635 | if (sp->sa_protocol != PX_PROTO_OL2TP) | |
636 | goto end; | |
637 | ||
638 | /* Check for already bound sockets */ | |
639 | error = -EBUSY; | |
640 | if (sk->sk_state & PPPOX_CONNECTED) | |
641 | goto end; | |
642 | ||
643 | /* We don't supporting rebinding anyway */ | |
644 | error = -EALREADY; | |
645 | if (sk->sk_user_data) | |
646 | goto end; /* socket is already attached */ | |
647 | ||
b79585f5 JC |
648 | /* Get params from socket address. Handle L2TPv2 and L2TPv3. |
649 | * This is nasty because there are different sockaddr_pppol2tp | |
650 | * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use | |
651 | * the sockaddr size to determine which structure the caller | |
652 | * is using. | |
653 | */ | |
654 | peer_tunnel_id = 0; | |
e0d4435f JC |
655 | if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) { |
656 | fd = sp->pppol2tp.fd; | |
657 | tunnel_id = sp->pppol2tp.s_tunnel; | |
658 | peer_tunnel_id = sp->pppol2tp.d_tunnel; | |
659 | session_id = sp->pppol2tp.s_session; | |
660 | peer_session_id = sp->pppol2tp.d_session; | |
661 | } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) { | |
b79585f5 JC |
662 | struct sockaddr_pppol2tpv3 *sp3 = |
663 | (struct sockaddr_pppol2tpv3 *) sp; | |
e0d4435f JC |
664 | ver = 3; |
665 | fd = sp3->pppol2tp.fd; | |
666 | tunnel_id = sp3->pppol2tp.s_tunnel; | |
667 | peer_tunnel_id = sp3->pppol2tp.d_tunnel; | |
668 | session_id = sp3->pppol2tp.s_session; | |
669 | peer_session_id = sp3->pppol2tp.d_session; | |
b79585f5 JC |
670 | } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpin6)) { |
671 | struct sockaddr_pppol2tpin6 *sp6 = | |
672 | (struct sockaddr_pppol2tpin6 *) sp; | |
673 | fd = sp6->pppol2tp.fd; | |
674 | tunnel_id = sp6->pppol2tp.s_tunnel; | |
675 | peer_tunnel_id = sp6->pppol2tp.d_tunnel; | |
676 | session_id = sp6->pppol2tp.s_session; | |
677 | peer_session_id = sp6->pppol2tp.d_session; | |
678 | } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3in6)) { | |
679 | struct sockaddr_pppol2tpv3in6 *sp6 = | |
680 | (struct sockaddr_pppol2tpv3in6 *) sp; | |
681 | ver = 3; | |
682 | fd = sp6->pppol2tp.fd; | |
683 | tunnel_id = sp6->pppol2tp.s_tunnel; | |
684 | peer_tunnel_id = sp6->pppol2tp.d_tunnel; | |
685 | session_id = sp6->pppol2tp.s_session; | |
686 | peer_session_id = sp6->pppol2tp.d_session; | |
e0d4435f JC |
687 | } else { |
688 | error = -EINVAL; | |
689 | goto end; /* bad socket address */ | |
690 | } | |
691 | ||
692 | /* Don't bind if tunnel_id is 0 */ | |
fd558d18 | 693 | error = -EINVAL; |
e0d4435f | 694 | if (tunnel_id == 0) |
fd558d18 JC |
695 | goto end; |
696 | ||
309795f4 JC |
697 | tunnel = l2tp_tunnel_find(sock_net(sk), tunnel_id); |
698 | ||
e0d4435f JC |
699 | /* Special case: create tunnel context if session_id and |
700 | * peer_session_id is 0. Otherwise look up tunnel using supplied | |
fd558d18 JC |
701 | * tunnel id. |
702 | */ | |
e0d4435f | 703 | if ((session_id == 0) && (peer_session_id == 0)) { |
309795f4 JC |
704 | if (tunnel == NULL) { |
705 | struct l2tp_tunnel_cfg tcfg = { | |
706 | .encap = L2TP_ENCAPTYPE_UDP, | |
707 | .debug = 0, | |
708 | }; | |
709 | error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel); | |
710 | if (error < 0) | |
711 | goto end; | |
712 | } | |
fd558d18 | 713 | } else { |
fd558d18 JC |
714 | /* Error if we can't find the tunnel */ |
715 | error = -ENOENT; | |
716 | if (tunnel == NULL) | |
717 | goto end; | |
718 | ||
719 | /* Error if socket is not prepped */ | |
720 | if (tunnel->sock == NULL) | |
721 | goto end; | |
722 | } | |
723 | ||
724 | if (tunnel->recv_payload_hook == NULL) | |
725 | tunnel->recv_payload_hook = pppol2tp_recv_payload_hook; | |
726 | ||
b79585f5 JC |
727 | if (tunnel->peer_tunnel_id == 0) |
728 | tunnel->peer_tunnel_id = peer_tunnel_id; | |
fd558d18 | 729 | |
309795f4 JC |
730 | /* Create session if it doesn't already exist. We handle the |
731 | * case where a session was previously created by the netlink | |
732 | * interface by checking that the session doesn't already have | |
733 | * a socket and its tunnel socket are what we expect. If any | |
734 | * of those checks fail, return EEXIST to the caller. | |
735 | */ | |
736 | session = l2tp_session_find(sock_net(sk), tunnel, session_id); | |
fd558d18 | 737 | if (session == NULL) { |
309795f4 JC |
738 | /* Default MTU must allow space for UDP/L2TP/PPP |
739 | * headers. | |
740 | */ | |
741 | cfg.mtu = cfg.mru = 1500 - PPPOL2TP_HEADER_OVERHEAD; | |
742 | ||
743 | /* Allocate and initialize a new session context. */ | |
744 | session = l2tp_session_create(sizeof(struct pppol2tp_session), | |
745 | tunnel, session_id, | |
746 | peer_session_id, &cfg); | |
747 | if (session == NULL) { | |
748 | error = -ENOMEM; | |
749 | goto end; | |
750 | } | |
751 | } else { | |
752 | ps = l2tp_session_priv(session); | |
753 | error = -EEXIST; | |
754 | if (ps->sock != NULL) | |
755 | goto end; | |
756 | ||
757 | /* consistency checks */ | |
758 | if (ps->tunnel_sock != tunnel->sock) | |
759 | goto end; | |
fd558d18 JC |
760 | } |
761 | ||
309795f4 | 762 | /* Associate session with its PPPoL2TP socket */ |
fd558d18 JC |
763 | ps = l2tp_session_priv(session); |
764 | ps->owner = current->pid; | |
765 | ps->sock = sk; | |
766 | ps->tunnel_sock = tunnel->sock; | |
767 | ||
768 | session->recv_skb = pppol2tp_recv; | |
769 | session->session_close = pppol2tp_session_close; | |
f66ef2d0 | 770 | #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE) |
0ad66140 JC |
771 | session->show = pppol2tp_show; |
772 | #endif | |
fd558d18 JC |
773 | |
774 | /* We need to know each time a skb is dropped from the reorder | |
775 | * queue. | |
776 | */ | |
777 | session->ref = pppol2tp_session_sock_hold; | |
778 | session->deref = pppol2tp_session_sock_put; | |
779 | ||
780 | /* If PMTU discovery was enabled, use the MTU that was discovered */ | |
781 | dst = sk_dst_get(sk); | |
782 | if (dst != NULL) { | |
783 | u32 pmtu = dst_mtu(__sk_dst_get(sk)); | |
784 | if (pmtu != 0) | |
785 | session->mtu = session->mru = pmtu - | |
786 | PPPOL2TP_HEADER_OVERHEAD; | |
787 | dst_release(dst); | |
788 | } | |
789 | ||
790 | /* Special case: if source & dest session_id == 0x0000, this | |
791 | * socket is being created to manage the tunnel. Just set up | |
792 | * the internal context for use by ioctl() and sockopt() | |
793 | * handlers. | |
794 | */ | |
795 | if ((session->session_id == 0) && | |
796 | (session->peer_session_id == 0)) { | |
797 | error = 0; | |
798 | goto out_no_ppp; | |
799 | } | |
800 | ||
801 | /* The only header we need to worry about is the L2TP | |
802 | * header. This size is different depending on whether | |
803 | * sequence numbers are enabled for the data channel. | |
804 | */ | |
805 | po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
806 | ||
807 | po->chan.private = sk; | |
808 | po->chan.ops = &pppol2tp_chan_ops; | |
809 | po->chan.mtu = session->mtu; | |
810 | ||
811 | error = ppp_register_net_channel(sock_net(sk), &po->chan); | |
812 | if (error) | |
813 | goto end; | |
814 | ||
815 | out_no_ppp: | |
816 | /* This is how we get the session context from the socket. */ | |
817 | sk->sk_user_data = session; | |
818 | sk->sk_state = PPPOX_CONNECTED; | |
a4ca44fa JP |
819 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: created\n", |
820 | session->name); | |
fd558d18 JC |
821 | |
822 | end: | |
823 | release_sock(sk); | |
824 | ||
825 | return error; | |
826 | } | |
827 | ||
309795f4 JC |
828 | #ifdef CONFIG_L2TP_V3 |
829 | ||
830 | /* Called when creating sessions via the netlink interface. | |
831 | */ | |
832 | static int pppol2tp_session_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg) | |
833 | { | |
834 | int error; | |
835 | struct l2tp_tunnel *tunnel; | |
836 | struct l2tp_session *session; | |
837 | struct pppol2tp_session *ps; | |
838 | ||
839 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
840 | ||
841 | /* Error if we can't find the tunnel */ | |
842 | error = -ENOENT; | |
843 | if (tunnel == NULL) | |
844 | goto out; | |
845 | ||
846 | /* Error if tunnel socket is not prepped */ | |
847 | if (tunnel->sock == NULL) | |
848 | goto out; | |
849 | ||
850 | /* Check that this session doesn't already exist */ | |
851 | error = -EEXIST; | |
852 | session = l2tp_session_find(net, tunnel, session_id); | |
853 | if (session != NULL) | |
854 | goto out; | |
855 | ||
856 | /* Default MTU values. */ | |
857 | if (cfg->mtu == 0) | |
858 | cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD; | |
859 | if (cfg->mru == 0) | |
860 | cfg->mru = cfg->mtu; | |
861 | ||
862 | /* Allocate and initialize a new session context. */ | |
863 | error = -ENOMEM; | |
864 | session = l2tp_session_create(sizeof(struct pppol2tp_session), | |
865 | tunnel, session_id, | |
866 | peer_session_id, cfg); | |
867 | if (session == NULL) | |
868 | goto out; | |
869 | ||
870 | ps = l2tp_session_priv(session); | |
871 | ps->tunnel_sock = tunnel->sock; | |
872 | ||
a4ca44fa JP |
873 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: created\n", |
874 | session->name); | |
309795f4 JC |
875 | |
876 | error = 0; | |
877 | ||
878 | out: | |
879 | return error; | |
880 | } | |
881 | ||
882 | /* Called when deleting sessions via the netlink interface. | |
883 | */ | |
884 | static int pppol2tp_session_delete(struct l2tp_session *session) | |
885 | { | |
886 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
887 | ||
888 | if (ps->sock == NULL) | |
889 | l2tp_session_dec_refcount(session); | |
890 | ||
891 | return 0; | |
892 | } | |
893 | ||
894 | #endif /* CONFIG_L2TP_V3 */ | |
895 | ||
fd558d18 JC |
896 | /* getname() support. |
897 | */ | |
898 | static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr, | |
899 | int *usockaddr_len, int peer) | |
900 | { | |
e0d4435f | 901 | int len = 0; |
fd558d18 JC |
902 | int error = 0; |
903 | struct l2tp_session *session; | |
904 | struct l2tp_tunnel *tunnel; | |
905 | struct sock *sk = sock->sk; | |
906 | struct inet_sock *inet; | |
907 | struct pppol2tp_session *pls; | |
908 | ||
909 | error = -ENOTCONN; | |
910 | if (sk == NULL) | |
911 | goto end; | |
912 | if (sk->sk_state != PPPOX_CONNECTED) | |
913 | goto end; | |
914 | ||
915 | error = -EBADF; | |
916 | session = pppol2tp_sock_to_session(sk); | |
917 | if (session == NULL) | |
918 | goto end; | |
919 | ||
920 | pls = l2tp_session_priv(session); | |
921 | tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock); | |
922 | if (tunnel == NULL) { | |
923 | error = -EBADF; | |
924 | goto end_put_sess; | |
925 | } | |
926 | ||
bbdb32cb | 927 | inet = inet_sk(tunnel->sock); |
d2cf3361 | 928 | if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) { |
e0d4435f JC |
929 | struct sockaddr_pppol2tp sp; |
930 | len = sizeof(sp); | |
931 | memset(&sp, 0, len); | |
932 | sp.sa_family = AF_PPPOX; | |
933 | sp.sa_protocol = PX_PROTO_OL2TP; | |
934 | sp.pppol2tp.fd = tunnel->fd; | |
935 | sp.pppol2tp.pid = pls->owner; | |
936 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
937 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
938 | sp.pppol2tp.s_session = session->session_id; | |
939 | sp.pppol2tp.d_session = session->peer_session_id; | |
940 | sp.pppol2tp.addr.sin_family = AF_INET; | |
941 | sp.pppol2tp.addr.sin_port = inet->inet_dport; | |
942 | sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr; | |
943 | memcpy(uaddr, &sp, len); | |
d2cf3361 BL |
944 | #if IS_ENABLED(CONFIG_IPV6) |
945 | } else if ((tunnel->version == 2) && | |
946 | (tunnel->sock->sk_family == AF_INET6)) { | |
947 | struct ipv6_pinfo *np = inet6_sk(tunnel->sock); | |
948 | struct sockaddr_pppol2tpin6 sp; | |
949 | len = sizeof(sp); | |
950 | memset(&sp, 0, len); | |
951 | sp.sa_family = AF_PPPOX; | |
952 | sp.sa_protocol = PX_PROTO_OL2TP; | |
953 | sp.pppol2tp.fd = tunnel->fd; | |
954 | sp.pppol2tp.pid = pls->owner; | |
955 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
956 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
957 | sp.pppol2tp.s_session = session->session_id; | |
958 | sp.pppol2tp.d_session = session->peer_session_id; | |
959 | sp.pppol2tp.addr.sin6_family = AF_INET6; | |
960 | sp.pppol2tp.addr.sin6_port = inet->inet_dport; | |
961 | memcpy(&sp.pppol2tp.addr.sin6_addr, &np->daddr, | |
962 | sizeof(np->daddr)); | |
963 | memcpy(uaddr, &sp, len); | |
964 | } else if ((tunnel->version == 3) && | |
965 | (tunnel->sock->sk_family == AF_INET6)) { | |
966 | struct ipv6_pinfo *np = inet6_sk(tunnel->sock); | |
967 | struct sockaddr_pppol2tpv3in6 sp; | |
968 | len = sizeof(sp); | |
969 | memset(&sp, 0, len); | |
970 | sp.sa_family = AF_PPPOX; | |
971 | sp.sa_protocol = PX_PROTO_OL2TP; | |
972 | sp.pppol2tp.fd = tunnel->fd; | |
973 | sp.pppol2tp.pid = pls->owner; | |
974 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
975 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
976 | sp.pppol2tp.s_session = session->session_id; | |
977 | sp.pppol2tp.d_session = session->peer_session_id; | |
978 | sp.pppol2tp.addr.sin6_family = AF_INET6; | |
979 | sp.pppol2tp.addr.sin6_port = inet->inet_dport; | |
980 | memcpy(&sp.pppol2tp.addr.sin6_addr, &np->daddr, | |
981 | sizeof(np->daddr)); | |
982 | memcpy(uaddr, &sp, len); | |
983 | #endif | |
e0d4435f JC |
984 | } else if (tunnel->version == 3) { |
985 | struct sockaddr_pppol2tpv3 sp; | |
986 | len = sizeof(sp); | |
987 | memset(&sp, 0, len); | |
988 | sp.sa_family = AF_PPPOX; | |
989 | sp.sa_protocol = PX_PROTO_OL2TP; | |
990 | sp.pppol2tp.fd = tunnel->fd; | |
991 | sp.pppol2tp.pid = pls->owner; | |
992 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
993 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
994 | sp.pppol2tp.s_session = session->session_id; | |
995 | sp.pppol2tp.d_session = session->peer_session_id; | |
996 | sp.pppol2tp.addr.sin_family = AF_INET; | |
997 | sp.pppol2tp.addr.sin_port = inet->inet_dport; | |
998 | sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr; | |
999 | memcpy(uaddr, &sp, len); | |
1000 | } | |
fd558d18 JC |
1001 | |
1002 | *usockaddr_len = len; | |
1003 | ||
1004 | sock_put(pls->tunnel_sock); | |
1005 | end_put_sess: | |
1006 | sock_put(sk); | |
1007 | error = 0; | |
1008 | ||
1009 | end: | |
1010 | return error; | |
1011 | } | |
1012 | ||
1013 | /**************************************************************************** | |
1014 | * ioctl() handlers. | |
1015 | * | |
1016 | * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP | |
1017 | * sockets. However, in order to control kernel tunnel features, we allow | |
1018 | * userspace to create a special "tunnel" PPPoX socket which is used for | |
1019 | * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow | |
1020 | * the user application to issue L2TP setsockopt(), getsockopt() and ioctl() | |
1021 | * calls. | |
1022 | ****************************************************************************/ | |
1023 | ||
1024 | static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest, | |
1025 | struct l2tp_stats *stats) | |
1026 | { | |
1027 | dest->tx_packets = stats->tx_packets; | |
1028 | dest->tx_bytes = stats->tx_bytes; | |
1029 | dest->tx_errors = stats->tx_errors; | |
1030 | dest->rx_packets = stats->rx_packets; | |
1031 | dest->rx_bytes = stats->rx_bytes; | |
1032 | dest->rx_seq_discards = stats->rx_seq_discards; | |
1033 | dest->rx_oos_packets = stats->rx_oos_packets; | |
1034 | dest->rx_errors = stats->rx_errors; | |
1035 | } | |
1036 | ||
1037 | /* Session ioctl helper. | |
1038 | */ | |
1039 | static int pppol2tp_session_ioctl(struct l2tp_session *session, | |
1040 | unsigned int cmd, unsigned long arg) | |
1041 | { | |
1042 | struct ifreq ifr; | |
1043 | int err = 0; | |
1044 | struct sock *sk; | |
1045 | int val = (int) arg; | |
1046 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
1047 | struct l2tp_tunnel *tunnel = session->tunnel; | |
1048 | struct pppol2tp_ioc_stats stats; | |
1049 | ||
a4ca44fa JP |
1050 | l2tp_dbg(session, PPPOL2TP_MSG_CONTROL, |
1051 | "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n", | |
1052 | session->name, cmd, arg); | |
fd558d18 JC |
1053 | |
1054 | sk = ps->sock; | |
1055 | sock_hold(sk); | |
1056 | ||
1057 | switch (cmd) { | |
1058 | case SIOCGIFMTU: | |
1059 | err = -ENXIO; | |
1060 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1061 | break; | |
1062 | ||
1063 | err = -EFAULT; | |
1064 | if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq))) | |
1065 | break; | |
1066 | ifr.ifr_mtu = session->mtu; | |
1067 | if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq))) | |
1068 | break; | |
1069 | ||
a4ca44fa JP |
1070 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get mtu=%d\n", |
1071 | session->name, session->mtu); | |
fd558d18 JC |
1072 | err = 0; |
1073 | break; | |
1074 | ||
1075 | case SIOCSIFMTU: | |
1076 | err = -ENXIO; | |
1077 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1078 | break; | |
1079 | ||
1080 | err = -EFAULT; | |
1081 | if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq))) | |
1082 | break; | |
1083 | ||
1084 | session->mtu = ifr.ifr_mtu; | |
1085 | ||
a4ca44fa JP |
1086 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set mtu=%d\n", |
1087 | session->name, session->mtu); | |
fd558d18 JC |
1088 | err = 0; |
1089 | break; | |
1090 | ||
1091 | case PPPIOCGMRU: | |
1092 | err = -ENXIO; | |
1093 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1094 | break; | |
1095 | ||
1096 | err = -EFAULT; | |
1097 | if (put_user(session->mru, (int __user *) arg)) | |
1098 | break; | |
1099 | ||
a4ca44fa JP |
1100 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get mru=%d\n", |
1101 | session->name, session->mru); | |
fd558d18 JC |
1102 | err = 0; |
1103 | break; | |
1104 | ||
1105 | case PPPIOCSMRU: | |
1106 | err = -ENXIO; | |
1107 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1108 | break; | |
1109 | ||
1110 | err = -EFAULT; | |
1111 | if (get_user(val, (int __user *) arg)) | |
1112 | break; | |
1113 | ||
1114 | session->mru = val; | |
a4ca44fa JP |
1115 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set mru=%d\n", |
1116 | session->name, session->mru); | |
fd558d18 JC |
1117 | err = 0; |
1118 | break; | |
1119 | ||
1120 | case PPPIOCGFLAGS: | |
1121 | err = -EFAULT; | |
1122 | if (put_user(ps->flags, (int __user *) arg)) | |
1123 | break; | |
1124 | ||
a4ca44fa JP |
1125 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get flags=%d\n", |
1126 | session->name, ps->flags); | |
fd558d18 JC |
1127 | err = 0; |
1128 | break; | |
1129 | ||
1130 | case PPPIOCSFLAGS: | |
1131 | err = -EFAULT; | |
1132 | if (get_user(val, (int __user *) arg)) | |
1133 | break; | |
1134 | ps->flags = val; | |
a4ca44fa JP |
1135 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set flags=%d\n", |
1136 | session->name, ps->flags); | |
fd558d18 JC |
1137 | err = 0; |
1138 | break; | |
1139 | ||
1140 | case PPPIOCGL2TPSTATS: | |
1141 | err = -ENXIO; | |
1142 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1143 | break; | |
1144 | ||
1145 | memset(&stats, 0, sizeof(stats)); | |
1146 | stats.tunnel_id = tunnel->tunnel_id; | |
1147 | stats.session_id = session->session_id; | |
1148 | pppol2tp_copy_stats(&stats, &session->stats); | |
1149 | if (copy_to_user((void __user *) arg, &stats, | |
1150 | sizeof(stats))) | |
1151 | break; | |
a4ca44fa JP |
1152 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get L2TP stats\n", |
1153 | session->name); | |
fd558d18 JC |
1154 | err = 0; |
1155 | break; | |
1156 | ||
1157 | default: | |
1158 | err = -ENOSYS; | |
1159 | break; | |
1160 | } | |
1161 | ||
1162 | sock_put(sk); | |
1163 | ||
1164 | return err; | |
1165 | } | |
1166 | ||
1167 | /* Tunnel ioctl helper. | |
1168 | * | |
1169 | * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data | |
1170 | * specifies a session_id, the session ioctl handler is called. This allows an | |
1171 | * application to retrieve session stats via a tunnel socket. | |
1172 | */ | |
1173 | static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel, | |
1174 | unsigned int cmd, unsigned long arg) | |
1175 | { | |
1176 | int err = 0; | |
1177 | struct sock *sk; | |
1178 | struct pppol2tp_ioc_stats stats; | |
1179 | ||
a4ca44fa JP |
1180 | l2tp_dbg(tunnel, PPPOL2TP_MSG_CONTROL, |
1181 | "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n", | |
1182 | tunnel->name, cmd, arg); | |
fd558d18 JC |
1183 | |
1184 | sk = tunnel->sock; | |
1185 | sock_hold(sk); | |
1186 | ||
1187 | switch (cmd) { | |
1188 | case PPPIOCGL2TPSTATS: | |
1189 | err = -ENXIO; | |
1190 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1191 | break; | |
1192 | ||
1193 | if (copy_from_user(&stats, (void __user *) arg, | |
1194 | sizeof(stats))) { | |
1195 | err = -EFAULT; | |
1196 | break; | |
1197 | } | |
1198 | if (stats.session_id != 0) { | |
1199 | /* resend to session ioctl handler */ | |
1200 | struct l2tp_session *session = | |
f7faffa3 | 1201 | l2tp_session_find(sock_net(sk), tunnel, stats.session_id); |
fd558d18 JC |
1202 | if (session != NULL) |
1203 | err = pppol2tp_session_ioctl(session, cmd, arg); | |
1204 | else | |
1205 | err = -EBADR; | |
1206 | break; | |
1207 | } | |
1208 | #ifdef CONFIG_XFRM | |
1209 | stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0; | |
1210 | #endif | |
1211 | pppol2tp_copy_stats(&stats, &tunnel->stats); | |
1212 | if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) { | |
1213 | err = -EFAULT; | |
1214 | break; | |
1215 | } | |
a4ca44fa JP |
1216 | l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: get L2TP stats\n", |
1217 | tunnel->name); | |
fd558d18 JC |
1218 | err = 0; |
1219 | break; | |
1220 | ||
1221 | default: | |
1222 | err = -ENOSYS; | |
1223 | break; | |
1224 | } | |
1225 | ||
1226 | sock_put(sk); | |
1227 | ||
1228 | return err; | |
1229 | } | |
1230 | ||
1231 | /* Main ioctl() handler. | |
1232 | * Dispatch to tunnel or session helpers depending on the socket. | |
1233 | */ | |
1234 | static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd, | |
1235 | unsigned long arg) | |
1236 | { | |
1237 | struct sock *sk = sock->sk; | |
1238 | struct l2tp_session *session; | |
1239 | struct l2tp_tunnel *tunnel; | |
1240 | struct pppol2tp_session *ps; | |
1241 | int err; | |
1242 | ||
1243 | if (!sk) | |
1244 | return 0; | |
1245 | ||
1246 | err = -EBADF; | |
1247 | if (sock_flag(sk, SOCK_DEAD) != 0) | |
1248 | goto end; | |
1249 | ||
1250 | err = -ENOTCONN; | |
1251 | if ((sk->sk_user_data == NULL) || | |
1252 | (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)))) | |
1253 | goto end; | |
1254 | ||
1255 | /* Get session context from the socket */ | |
1256 | err = -EBADF; | |
1257 | session = pppol2tp_sock_to_session(sk); | |
1258 | if (session == NULL) | |
1259 | goto end; | |
1260 | ||
1261 | /* Special case: if session's session_id is zero, treat ioctl as a | |
1262 | * tunnel ioctl | |
1263 | */ | |
1264 | ps = l2tp_session_priv(session); | |
1265 | if ((session->session_id == 0) && | |
1266 | (session->peer_session_id == 0)) { | |
1267 | err = -EBADF; | |
1268 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
1269 | if (tunnel == NULL) | |
1270 | goto end_put_sess; | |
1271 | ||
1272 | err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg); | |
1273 | sock_put(ps->tunnel_sock); | |
1274 | goto end_put_sess; | |
1275 | } | |
1276 | ||
1277 | err = pppol2tp_session_ioctl(session, cmd, arg); | |
1278 | ||
1279 | end_put_sess: | |
1280 | sock_put(sk); | |
1281 | end: | |
1282 | return err; | |
1283 | } | |
1284 | ||
1285 | /***************************************************************************** | |
1286 | * setsockopt() / getsockopt() support. | |
1287 | * | |
1288 | * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP | |
1289 | * sockets. In order to control kernel tunnel features, we allow userspace to | |
1290 | * create a special "tunnel" PPPoX socket which is used for control only. | |
1291 | * Tunnel PPPoX sockets have session_id == 0 and simply allow the user | |
1292 | * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls. | |
1293 | *****************************************************************************/ | |
1294 | ||
1295 | /* Tunnel setsockopt() helper. | |
1296 | */ | |
1297 | static int pppol2tp_tunnel_setsockopt(struct sock *sk, | |
1298 | struct l2tp_tunnel *tunnel, | |
1299 | int optname, int val) | |
1300 | { | |
1301 | int err = 0; | |
1302 | ||
1303 | switch (optname) { | |
1304 | case PPPOL2TP_SO_DEBUG: | |
1305 | tunnel->debug = val; | |
a4ca44fa JP |
1306 | l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: set debug=%x\n", |
1307 | tunnel->name, tunnel->debug); | |
fd558d18 JC |
1308 | break; |
1309 | ||
1310 | default: | |
1311 | err = -ENOPROTOOPT; | |
1312 | break; | |
1313 | } | |
1314 | ||
1315 | return err; | |
1316 | } | |
1317 | ||
1318 | /* Session setsockopt helper. | |
1319 | */ | |
1320 | static int pppol2tp_session_setsockopt(struct sock *sk, | |
1321 | struct l2tp_session *session, | |
1322 | int optname, int val) | |
1323 | { | |
1324 | int err = 0; | |
1325 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
1326 | ||
1327 | switch (optname) { | |
1328 | case PPPOL2TP_SO_RECVSEQ: | |
1329 | if ((val != 0) && (val != 1)) { | |
1330 | err = -EINVAL; | |
1331 | break; | |
1332 | } | |
1333 | session->recv_seq = val ? -1 : 0; | |
a4ca44fa JP |
1334 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, |
1335 | "%s: set recv_seq=%d\n", | |
1336 | session->name, session->recv_seq); | |
fd558d18 JC |
1337 | break; |
1338 | ||
1339 | case PPPOL2TP_SO_SENDSEQ: | |
1340 | if ((val != 0) && (val != 1)) { | |
1341 | err = -EINVAL; | |
1342 | break; | |
1343 | } | |
1344 | session->send_seq = val ? -1 : 0; | |
1345 | { | |
1346 | struct sock *ssk = ps->sock; | |
1347 | struct pppox_sock *po = pppox_sk(ssk); | |
1348 | po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ : | |
1349 | PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
1350 | } | |
a4ca44fa JP |
1351 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, |
1352 | "%s: set send_seq=%d\n", | |
1353 | session->name, session->send_seq); | |
fd558d18 JC |
1354 | break; |
1355 | ||
1356 | case PPPOL2TP_SO_LNSMODE: | |
1357 | if ((val != 0) && (val != 1)) { | |
1358 | err = -EINVAL; | |
1359 | break; | |
1360 | } | |
1361 | session->lns_mode = val ? -1 : 0; | |
a4ca44fa JP |
1362 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, |
1363 | "%s: set lns_mode=%d\n", | |
1364 | session->name, session->lns_mode); | |
fd558d18 JC |
1365 | break; |
1366 | ||
1367 | case PPPOL2TP_SO_DEBUG: | |
1368 | session->debug = val; | |
a4ca44fa JP |
1369 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set debug=%x\n", |
1370 | session->name, session->debug); | |
fd558d18 JC |
1371 | break; |
1372 | ||
1373 | case PPPOL2TP_SO_REORDERTO: | |
1374 | session->reorder_timeout = msecs_to_jiffies(val); | |
a4ca44fa JP |
1375 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, |
1376 | "%s: set reorder_timeout=%d\n", | |
1377 | session->name, session->reorder_timeout); | |
fd558d18 JC |
1378 | break; |
1379 | ||
1380 | default: | |
1381 | err = -ENOPROTOOPT; | |
1382 | break; | |
1383 | } | |
1384 | ||
1385 | return err; | |
1386 | } | |
1387 | ||
1388 | /* Main setsockopt() entry point. | |
1389 | * Does API checks, then calls either the tunnel or session setsockopt | |
1390 | * handler, according to whether the PPPoL2TP socket is a for a regular | |
1391 | * session or the special tunnel type. | |
1392 | */ | |
1393 | static int pppol2tp_setsockopt(struct socket *sock, int level, int optname, | |
1394 | char __user *optval, unsigned int optlen) | |
1395 | { | |
1396 | struct sock *sk = sock->sk; | |
1397 | struct l2tp_session *session; | |
1398 | struct l2tp_tunnel *tunnel; | |
1399 | struct pppol2tp_session *ps; | |
1400 | int val; | |
1401 | int err; | |
1402 | ||
1403 | if (level != SOL_PPPOL2TP) | |
1404 | return udp_prot.setsockopt(sk, level, optname, optval, optlen); | |
1405 | ||
1406 | if (optlen < sizeof(int)) | |
1407 | return -EINVAL; | |
1408 | ||
1409 | if (get_user(val, (int __user *)optval)) | |
1410 | return -EFAULT; | |
1411 | ||
1412 | err = -ENOTCONN; | |
1413 | if (sk->sk_user_data == NULL) | |
1414 | goto end; | |
1415 | ||
1416 | /* Get session context from the socket */ | |
1417 | err = -EBADF; | |
1418 | session = pppol2tp_sock_to_session(sk); | |
1419 | if (session == NULL) | |
1420 | goto end; | |
1421 | ||
1422 | /* Special case: if session_id == 0x0000, treat as operation on tunnel | |
1423 | */ | |
1424 | ps = l2tp_session_priv(session); | |
1425 | if ((session->session_id == 0) && | |
1426 | (session->peer_session_id == 0)) { | |
1427 | err = -EBADF; | |
1428 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
1429 | if (tunnel == NULL) | |
1430 | goto end_put_sess; | |
1431 | ||
1432 | err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val); | |
1433 | sock_put(ps->tunnel_sock); | |
1434 | } else | |
1435 | err = pppol2tp_session_setsockopt(sk, session, optname, val); | |
1436 | ||
1437 | err = 0; | |
1438 | ||
1439 | end_put_sess: | |
1440 | sock_put(sk); | |
1441 | end: | |
1442 | return err; | |
1443 | } | |
1444 | ||
1445 | /* Tunnel getsockopt helper. Called with sock locked. | |
1446 | */ | |
1447 | static int pppol2tp_tunnel_getsockopt(struct sock *sk, | |
1448 | struct l2tp_tunnel *tunnel, | |
1449 | int optname, int *val) | |
1450 | { | |
1451 | int err = 0; | |
1452 | ||
1453 | switch (optname) { | |
1454 | case PPPOL2TP_SO_DEBUG: | |
1455 | *val = tunnel->debug; | |
a4ca44fa JP |
1456 | l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: get debug=%x\n", |
1457 | tunnel->name, tunnel->debug); | |
fd558d18 JC |
1458 | break; |
1459 | ||
1460 | default: | |
1461 | err = -ENOPROTOOPT; | |
1462 | break; | |
1463 | } | |
1464 | ||
1465 | return err; | |
1466 | } | |
1467 | ||
1468 | /* Session getsockopt helper. Called with sock locked. | |
1469 | */ | |
1470 | static int pppol2tp_session_getsockopt(struct sock *sk, | |
1471 | struct l2tp_session *session, | |
1472 | int optname, int *val) | |
1473 | { | |
1474 | int err = 0; | |
1475 | ||
1476 | switch (optname) { | |
1477 | case PPPOL2TP_SO_RECVSEQ: | |
1478 | *val = session->recv_seq; | |
a4ca44fa JP |
1479 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, |
1480 | "%s: get recv_seq=%d\n", session->name, *val); | |
fd558d18 JC |
1481 | break; |
1482 | ||
1483 | case PPPOL2TP_SO_SENDSEQ: | |
1484 | *val = session->send_seq; | |
a4ca44fa JP |
1485 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, |
1486 | "%s: get send_seq=%d\n", session->name, *val); | |
fd558d18 JC |
1487 | break; |
1488 | ||
1489 | case PPPOL2TP_SO_LNSMODE: | |
1490 | *val = session->lns_mode; | |
a4ca44fa JP |
1491 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, |
1492 | "%s: get lns_mode=%d\n", session->name, *val); | |
fd558d18 JC |
1493 | break; |
1494 | ||
1495 | case PPPOL2TP_SO_DEBUG: | |
1496 | *val = session->debug; | |
a4ca44fa JP |
1497 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get debug=%d\n", |
1498 | session->name, *val); | |
fd558d18 JC |
1499 | break; |
1500 | ||
1501 | case PPPOL2TP_SO_REORDERTO: | |
1502 | *val = (int) jiffies_to_msecs(session->reorder_timeout); | |
a4ca44fa JP |
1503 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, |
1504 | "%s: get reorder_timeout=%d\n", session->name, *val); | |
fd558d18 JC |
1505 | break; |
1506 | ||
1507 | default: | |
1508 | err = -ENOPROTOOPT; | |
1509 | } | |
1510 | ||
1511 | return err; | |
1512 | } | |
1513 | ||
1514 | /* Main getsockopt() entry point. | |
1515 | * Does API checks, then calls either the tunnel or session getsockopt | |
1516 | * handler, according to whether the PPPoX socket is a for a regular session | |
1517 | * or the special tunnel type. | |
1518 | */ | |
e3192690 JP |
1519 | static int pppol2tp_getsockopt(struct socket *sock, int level, int optname, |
1520 | char __user *optval, int __user *optlen) | |
fd558d18 JC |
1521 | { |
1522 | struct sock *sk = sock->sk; | |
1523 | struct l2tp_session *session; | |
1524 | struct l2tp_tunnel *tunnel; | |
1525 | int val, len; | |
1526 | int err; | |
1527 | struct pppol2tp_session *ps; | |
1528 | ||
1529 | if (level != SOL_PPPOL2TP) | |
1530 | return udp_prot.getsockopt(sk, level, optname, optval, optlen); | |
1531 | ||
e3192690 | 1532 | if (get_user(len, optlen)) |
fd558d18 JC |
1533 | return -EFAULT; |
1534 | ||
1535 | len = min_t(unsigned int, len, sizeof(int)); | |
1536 | ||
1537 | if (len < 0) | |
1538 | return -EINVAL; | |
1539 | ||
1540 | err = -ENOTCONN; | |
1541 | if (sk->sk_user_data == NULL) | |
1542 | goto end; | |
1543 | ||
1544 | /* Get the session context */ | |
1545 | err = -EBADF; | |
1546 | session = pppol2tp_sock_to_session(sk); | |
1547 | if (session == NULL) | |
1548 | goto end; | |
1549 | ||
1550 | /* Special case: if session_id == 0x0000, treat as operation on tunnel */ | |
1551 | ps = l2tp_session_priv(session); | |
1552 | if ((session->session_id == 0) && | |
1553 | (session->peer_session_id == 0)) { | |
1554 | err = -EBADF; | |
1555 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
1556 | if (tunnel == NULL) | |
1557 | goto end_put_sess; | |
1558 | ||
1559 | err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val); | |
1560 | sock_put(ps->tunnel_sock); | |
1561 | } else | |
1562 | err = pppol2tp_session_getsockopt(sk, session, optname, &val); | |
1563 | ||
1564 | err = -EFAULT; | |
e3192690 | 1565 | if (put_user(len, optlen)) |
fd558d18 JC |
1566 | goto end_put_sess; |
1567 | ||
1568 | if (copy_to_user((void __user *) optval, &val, len)) | |
1569 | goto end_put_sess; | |
1570 | ||
1571 | err = 0; | |
1572 | ||
1573 | end_put_sess: | |
1574 | sock_put(sk); | |
1575 | end: | |
1576 | return err; | |
1577 | } | |
1578 | ||
1579 | /***************************************************************************** | |
1580 | * /proc filesystem for debug | |
f7faffa3 JC |
1581 | * Since the original pppol2tp driver provided /proc/net/pppol2tp for |
1582 | * L2TPv2, we dump only L2TPv2 tunnels and sessions here. | |
fd558d18 JC |
1583 | *****************************************************************************/ |
1584 | ||
1585 | static unsigned int pppol2tp_net_id; | |
1586 | ||
1587 | #ifdef CONFIG_PROC_FS | |
1588 | ||
1589 | struct pppol2tp_seq_data { | |
1590 | struct seq_net_private p; | |
1591 | int tunnel_idx; /* current tunnel */ | |
1592 | int session_idx; /* index of session within current tunnel */ | |
1593 | struct l2tp_tunnel *tunnel; | |
1594 | struct l2tp_session *session; /* NULL means get next tunnel */ | |
1595 | }; | |
1596 | ||
1597 | static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd) | |
1598 | { | |
f7faffa3 JC |
1599 | for (;;) { |
1600 | pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx); | |
1601 | pd->tunnel_idx++; | |
1602 | ||
1603 | if (pd->tunnel == NULL) | |
1604 | break; | |
1605 | ||
1606 | /* Ignore L2TPv3 tunnels */ | |
1607 | if (pd->tunnel->version < 3) | |
1608 | break; | |
1609 | } | |
fd558d18 JC |
1610 | } |
1611 | ||
1612 | static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd) | |
1613 | { | |
1614 | pd->session = l2tp_session_find_nth(pd->tunnel, pd->session_idx); | |
1615 | pd->session_idx++; | |
f7faffa3 | 1616 | |
fd558d18 JC |
1617 | if (pd->session == NULL) { |
1618 | pd->session_idx = 0; | |
1619 | pppol2tp_next_tunnel(net, pd); | |
1620 | } | |
1621 | } | |
1622 | ||
1623 | static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs) | |
1624 | { | |
1625 | struct pppol2tp_seq_data *pd = SEQ_START_TOKEN; | |
1626 | loff_t pos = *offs; | |
1627 | struct net *net; | |
1628 | ||
1629 | if (!pos) | |
1630 | goto out; | |
1631 | ||
1632 | BUG_ON(m->private == NULL); | |
1633 | pd = m->private; | |
1634 | net = seq_file_net(m); | |
1635 | ||
1636 | if (pd->tunnel == NULL) | |
1637 | pppol2tp_next_tunnel(net, pd); | |
1638 | else | |
1639 | pppol2tp_next_session(net, pd); | |
1640 | ||
1641 | /* NULL tunnel and session indicates end of list */ | |
1642 | if ((pd->tunnel == NULL) && (pd->session == NULL)) | |
1643 | pd = NULL; | |
1644 | ||
1645 | out: | |
1646 | return pd; | |
1647 | } | |
1648 | ||
1649 | static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
1650 | { | |
1651 | (*pos)++; | |
1652 | return NULL; | |
1653 | } | |
1654 | ||
1655 | static void pppol2tp_seq_stop(struct seq_file *p, void *v) | |
1656 | { | |
1657 | /* nothing to do */ | |
1658 | } | |
1659 | ||
1660 | static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v) | |
1661 | { | |
1662 | struct l2tp_tunnel *tunnel = v; | |
1663 | ||
1664 | seq_printf(m, "\nTUNNEL '%s', %c %d\n", | |
1665 | tunnel->name, | |
1666 | (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N', | |
1667 | atomic_read(&tunnel->ref_count) - 1); | |
1668 | seq_printf(m, " %08x %llu/%llu/%llu %llu/%llu/%llu\n", | |
1669 | tunnel->debug, | |
1670 | (unsigned long long)tunnel->stats.tx_packets, | |
1671 | (unsigned long long)tunnel->stats.tx_bytes, | |
1672 | (unsigned long long)tunnel->stats.tx_errors, | |
1673 | (unsigned long long)tunnel->stats.rx_packets, | |
1674 | (unsigned long long)tunnel->stats.rx_bytes, | |
1675 | (unsigned long long)tunnel->stats.rx_errors); | |
1676 | } | |
1677 | ||
1678 | static void pppol2tp_seq_session_show(struct seq_file *m, void *v) | |
1679 | { | |
1680 | struct l2tp_session *session = v; | |
1681 | struct l2tp_tunnel *tunnel = session->tunnel; | |
1682 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
9345471b | 1683 | struct pppox_sock *po = pppox_sk(ps->sock); |
fd558d18 JC |
1684 | u32 ip = 0; |
1685 | u16 port = 0; | |
1686 | ||
1687 | if (tunnel->sock) { | |
1688 | struct inet_sock *inet = inet_sk(tunnel->sock); | |
1689 | ip = ntohl(inet->inet_saddr); | |
1690 | port = ntohs(inet->inet_sport); | |
1691 | } | |
1692 | ||
1693 | seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> " | |
1694 | "%04X/%04X %d %c\n", | |
1695 | session->name, ip, port, | |
1696 | tunnel->tunnel_id, | |
1697 | session->session_id, | |
1698 | tunnel->peer_tunnel_id, | |
1699 | session->peer_session_id, | |
1700 | ps->sock->sk_state, | |
1701 | (session == ps->sock->sk_user_data) ? | |
1702 | 'Y' : 'N'); | |
1703 | seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n", | |
1704 | session->mtu, session->mru, | |
1705 | session->recv_seq ? 'R' : '-', | |
1706 | session->send_seq ? 'S' : '-', | |
1707 | session->lns_mode ? "LNS" : "LAC", | |
1708 | session->debug, | |
1709 | jiffies_to_msecs(session->reorder_timeout)); | |
1710 | seq_printf(m, " %hu/%hu %llu/%llu/%llu %llu/%llu/%llu\n", | |
1711 | session->nr, session->ns, | |
1712 | (unsigned long long)session->stats.tx_packets, | |
1713 | (unsigned long long)session->stats.tx_bytes, | |
1714 | (unsigned long long)session->stats.tx_errors, | |
1715 | (unsigned long long)session->stats.rx_packets, | |
1716 | (unsigned long long)session->stats.rx_bytes, | |
1717 | (unsigned long long)session->stats.rx_errors); | |
9345471b JC |
1718 | |
1719 | if (po) | |
1720 | seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan)); | |
fd558d18 JC |
1721 | } |
1722 | ||
1723 | static int pppol2tp_seq_show(struct seq_file *m, void *v) | |
1724 | { | |
1725 | struct pppol2tp_seq_data *pd = v; | |
1726 | ||
1727 | /* display header on line 1 */ | |
1728 | if (v == SEQ_START_TOKEN) { | |
1729 | seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n"); | |
1730 | seq_puts(m, "TUNNEL name, user-data-ok session-count\n"); | |
1731 | seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
1732 | seq_puts(m, " SESSION name, addr/port src-tid/sid " | |
1733 | "dest-tid/sid state user-data-ok\n"); | |
1734 | seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n"); | |
1735 | seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
1736 | goto out; | |
1737 | } | |
1738 | ||
1739 | /* Show the tunnel or session context. | |
1740 | */ | |
1741 | if (pd->session == NULL) | |
1742 | pppol2tp_seq_tunnel_show(m, pd->tunnel); | |
1743 | else | |
1744 | pppol2tp_seq_session_show(m, pd->session); | |
1745 | ||
1746 | out: | |
1747 | return 0; | |
1748 | } | |
1749 | ||
1750 | static const struct seq_operations pppol2tp_seq_ops = { | |
1751 | .start = pppol2tp_seq_start, | |
1752 | .next = pppol2tp_seq_next, | |
1753 | .stop = pppol2tp_seq_stop, | |
1754 | .show = pppol2tp_seq_show, | |
1755 | }; | |
1756 | ||
1757 | /* Called when our /proc file is opened. We allocate data for use when | |
1758 | * iterating our tunnel / session contexts and store it in the private | |
1759 | * data of the seq_file. | |
1760 | */ | |
1761 | static int pppol2tp_proc_open(struct inode *inode, struct file *file) | |
1762 | { | |
1763 | return seq_open_net(inode, file, &pppol2tp_seq_ops, | |
1764 | sizeof(struct pppol2tp_seq_data)); | |
1765 | } | |
1766 | ||
1767 | static const struct file_operations pppol2tp_proc_fops = { | |
1768 | .owner = THIS_MODULE, | |
1769 | .open = pppol2tp_proc_open, | |
1770 | .read = seq_read, | |
1771 | .llseek = seq_lseek, | |
1772 | .release = seq_release_net, | |
1773 | }; | |
1774 | ||
1775 | #endif /* CONFIG_PROC_FS */ | |
1776 | ||
1777 | /***************************************************************************** | |
1778 | * Network namespace | |
1779 | *****************************************************************************/ | |
1780 | ||
1781 | static __net_init int pppol2tp_init_net(struct net *net) | |
1782 | { | |
1783 | struct proc_dir_entry *pde; | |
1784 | int err = 0; | |
1785 | ||
d4beaa66 G |
1786 | pde = proc_create("pppol2tp", S_IRUGO, net->proc_net, |
1787 | &pppol2tp_proc_fops); | |
fd558d18 JC |
1788 | if (!pde) { |
1789 | err = -ENOMEM; | |
1790 | goto out; | |
1791 | } | |
1792 | ||
1793 | out: | |
1794 | return err; | |
1795 | } | |
1796 | ||
1797 | static __net_exit void pppol2tp_exit_net(struct net *net) | |
1798 | { | |
ece31ffd | 1799 | remove_proc_entry("pppol2tp", net->proc_net); |
fd558d18 JC |
1800 | } |
1801 | ||
1802 | static struct pernet_operations pppol2tp_net_ops = { | |
1803 | .init = pppol2tp_init_net, | |
1804 | .exit = pppol2tp_exit_net, | |
1805 | .id = &pppol2tp_net_id, | |
1806 | }; | |
1807 | ||
1808 | /***************************************************************************** | |
1809 | * Init and cleanup | |
1810 | *****************************************************************************/ | |
1811 | ||
1812 | static const struct proto_ops pppol2tp_ops = { | |
1813 | .family = AF_PPPOX, | |
1814 | .owner = THIS_MODULE, | |
1815 | .release = pppol2tp_release, | |
1816 | .bind = sock_no_bind, | |
1817 | .connect = pppol2tp_connect, | |
1818 | .socketpair = sock_no_socketpair, | |
1819 | .accept = sock_no_accept, | |
1820 | .getname = pppol2tp_getname, | |
1821 | .poll = datagram_poll, | |
1822 | .listen = sock_no_listen, | |
1823 | .shutdown = sock_no_shutdown, | |
1824 | .setsockopt = pppol2tp_setsockopt, | |
1825 | .getsockopt = pppol2tp_getsockopt, | |
1826 | .sendmsg = pppol2tp_sendmsg, | |
1827 | .recvmsg = pppol2tp_recvmsg, | |
1828 | .mmap = sock_no_mmap, | |
1829 | .ioctl = pppox_ioctl, | |
1830 | }; | |
1831 | ||
756e64a0 | 1832 | static const struct pppox_proto pppol2tp_proto = { |
fd558d18 JC |
1833 | .create = pppol2tp_create, |
1834 | .ioctl = pppol2tp_ioctl | |
1835 | }; | |
1836 | ||
309795f4 JC |
1837 | #ifdef CONFIG_L2TP_V3 |
1838 | ||
1839 | static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = { | |
1840 | .session_create = pppol2tp_session_create, | |
1841 | .session_delete = pppol2tp_session_delete, | |
1842 | }; | |
1843 | ||
1844 | #endif /* CONFIG_L2TP_V3 */ | |
1845 | ||
fd558d18 JC |
1846 | static int __init pppol2tp_init(void) |
1847 | { | |
1848 | int err; | |
1849 | ||
1850 | err = register_pernet_device(&pppol2tp_net_ops); | |
1851 | if (err) | |
1852 | goto out; | |
1853 | ||
1854 | err = proto_register(&pppol2tp_sk_proto, 0); | |
1855 | if (err) | |
1856 | goto out_unregister_pppol2tp_pernet; | |
1857 | ||
1858 | err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto); | |
1859 | if (err) | |
1860 | goto out_unregister_pppol2tp_proto; | |
1861 | ||
309795f4 JC |
1862 | #ifdef CONFIG_L2TP_V3 |
1863 | err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops); | |
1864 | if (err) | |
1865 | goto out_unregister_pppox; | |
1866 | #endif | |
1867 | ||
a4ca44fa | 1868 | pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION); |
fd558d18 JC |
1869 | |
1870 | out: | |
1871 | return err; | |
309795f4 JC |
1872 | |
1873 | #ifdef CONFIG_L2TP_V3 | |
1874 | out_unregister_pppox: | |
1875 | unregister_pppox_proto(PX_PROTO_OL2TP); | |
1876 | #endif | |
fd558d18 JC |
1877 | out_unregister_pppol2tp_proto: |
1878 | proto_unregister(&pppol2tp_sk_proto); | |
1879 | out_unregister_pppol2tp_pernet: | |
1880 | unregister_pernet_device(&pppol2tp_net_ops); | |
1881 | goto out; | |
1882 | } | |
1883 | ||
1884 | static void __exit pppol2tp_exit(void) | |
1885 | { | |
309795f4 JC |
1886 | #ifdef CONFIG_L2TP_V3 |
1887 | l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP); | |
1888 | #endif | |
fd558d18 JC |
1889 | unregister_pppox_proto(PX_PROTO_OL2TP); |
1890 | proto_unregister(&pppol2tp_sk_proto); | |
1891 | unregister_pernet_device(&pppol2tp_net_ops); | |
1892 | } | |
1893 | ||
1894 | module_init(pppol2tp_init); | |
1895 | module_exit(pppol2tp_exit); | |
1896 | ||
1897 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); | |
1898 | MODULE_DESCRIPTION("PPP over L2TP over UDP"); | |
1899 | MODULE_LICENSE("GPL"); | |
1900 | MODULE_VERSION(PPPOL2TP_DRV_VERSION); | |
9395a09d | 1901 | MODULE_ALIAS("pppox-proto-" __stringify(PX_PROTO_OL2TP)); |