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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 | ||
60 | #include <linux/module.h> | |
61 | #include <linux/string.h> | |
62 | #include <linux/list.h> | |
63 | #include <linux/uaccess.h> | |
64 | ||
65 | #include <linux/kernel.h> | |
66 | #include <linux/spinlock.h> | |
67 | #include <linux/kthread.h> | |
68 | #include <linux/sched.h> | |
69 | #include <linux/slab.h> | |
70 | #include <linux/errno.h> | |
71 | #include <linux/jiffies.h> | |
72 | ||
73 | #include <linux/netdevice.h> | |
74 | #include <linux/net.h> | |
75 | #include <linux/inetdevice.h> | |
76 | #include <linux/skbuff.h> | |
77 | #include <linux/init.h> | |
78 | #include <linux/ip.h> | |
79 | #include <linux/udp.h> | |
80 | #include <linux/if_pppox.h> | |
81 | #include <linux/if_pppol2tp.h> | |
82 | #include <net/sock.h> | |
83 | #include <linux/ppp_channel.h> | |
84 | #include <linux/ppp_defs.h> | |
85 | #include <linux/if_ppp.h> | |
86 | #include <linux/file.h> | |
87 | #include <linux/hash.h> | |
88 | #include <linux/sort.h> | |
89 | #include <linux/proc_fs.h> | |
90 | #include <linux/nsproxy.h> | |
91 | #include <net/net_namespace.h> | |
92 | #include <net/netns/generic.h> | |
93 | #include <net/dst.h> | |
94 | #include <net/ip.h> | |
95 | #include <net/udp.h> | |
96 | #include <net/xfrm.h> | |
97 | ||
98 | #include <asm/byteorder.h> | |
99 | #include <asm/atomic.h> | |
100 | ||
101 | #include "l2tp_core.h" | |
102 | ||
103 | #define PPPOL2TP_DRV_VERSION "V2.0" | |
104 | ||
105 | /* Space for UDP, L2TP and PPP headers */ | |
106 | #define PPPOL2TP_HEADER_OVERHEAD 40 | |
107 | ||
108 | #define PRINTK(_mask, _type, _lvl, _fmt, args...) \ | |
109 | do { \ | |
110 | if ((_mask) & (_type)) \ | |
111 | printk(_lvl "PPPOL2TP: " _fmt, ##args); \ | |
112 | } while (0) | |
113 | ||
114 | /* Number of bytes to build transmit L2TP headers. | |
115 | * Unfortunately the size is different depending on whether sequence numbers | |
116 | * are enabled. | |
117 | */ | |
118 | #define PPPOL2TP_L2TP_HDR_SIZE_SEQ 10 | |
119 | #define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ 6 | |
120 | ||
121 | /* Private data of each session. This data lives at the end of struct | |
122 | * l2tp_session, referenced via session->priv[]. | |
123 | */ | |
124 | struct pppol2tp_session { | |
125 | int owner; /* pid that opened the socket */ | |
126 | ||
127 | struct sock *sock; /* Pointer to the session | |
128 | * PPPoX socket */ | |
129 | struct sock *tunnel_sock; /* Pointer to the tunnel UDP | |
130 | * socket */ | |
131 | int flags; /* accessed by PPPIOCGFLAGS. | |
132 | * Unused. */ | |
133 | }; | |
134 | ||
135 | static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb); | |
136 | ||
137 | static struct ppp_channel_ops pppol2tp_chan_ops = { pppol2tp_xmit , NULL }; | |
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; | |
235 | PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG, | |
236 | "%s: recv %d byte data frame, passing to ppp\n", | |
237 | session->name, data_len); | |
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 { | |
258 | PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_INFO, | |
259 | "%s: socket not bound\n", session->name); | |
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: | |
269 | PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_INFO, | |
270 | "%s: no socket\n", session->name); | |
271 | kfree_skb(skb); | |
272 | } | |
273 | ||
274 | static void pppol2tp_session_sock_hold(struct l2tp_session *session) | |
275 | { | |
276 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
277 | ||
278 | if (ps->sock) | |
279 | sock_hold(ps->sock); | |
280 | } | |
281 | ||
282 | static void pppol2tp_session_sock_put(struct l2tp_session *session) | |
283 | { | |
284 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
285 | ||
286 | if (ps->sock) | |
287 | sock_put(ps->sock); | |
288 | } | |
289 | ||
290 | /************************************************************************ | |
291 | * Transmit handling | |
292 | ***********************************************************************/ | |
293 | ||
fd558d18 JC |
294 | /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here |
295 | * when a user application does a sendmsg() on the session socket. L2TP and | |
296 | * PPP headers must be inserted into the user's data. | |
297 | */ | |
298 | static int pppol2tp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
299 | size_t total_len) | |
300 | { | |
301 | static const unsigned char ppph[2] = { 0xff, 0x03 }; | |
302 | struct sock *sk = sock->sk; | |
303 | struct sk_buff *skb; | |
304 | int error; | |
305 | struct l2tp_session *session; | |
306 | struct l2tp_tunnel *tunnel; | |
307 | struct pppol2tp_session *ps; | |
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 | ||
324 | /* Allocate a socket buffer */ | |
325 | error = -ENOMEM; | |
326 | skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) + | |
327 | sizeof(struct udphdr) + session->hdr_len + | |
328 | sizeof(ppph) + total_len, | |
329 | 0, GFP_KERNEL); | |
330 | if (!skb) | |
331 | goto error_put_sess_tun; | |
332 | ||
333 | /* Reserve space for headers. */ | |
334 | skb_reserve(skb, NET_SKB_PAD); | |
335 | skb_reset_network_header(skb); | |
336 | skb_reserve(skb, sizeof(struct iphdr)); | |
337 | skb_reset_transport_header(skb); | |
338 | skb_reserve(skb, sizeof(struct udphdr)); | |
339 | ||
340 | /* Add PPP header */ | |
341 | skb->data[0] = ppph[0]; | |
342 | skb->data[1] = ppph[1]; | |
343 | skb_put(skb, 2); | |
344 | ||
345 | /* Copy user data into skb */ | |
346 | error = memcpy_fromiovec(skb->data, m->msg_iov, total_len); | |
347 | if (error < 0) { | |
348 | kfree_skb(skb); | |
349 | goto error_put_sess_tun; | |
350 | } | |
351 | skb_put(skb, total_len); | |
352 | ||
353 | l2tp_xmit_skb(session, skb, session->hdr_len); | |
354 | ||
355 | sock_put(ps->tunnel_sock); | |
356 | ||
357 | return error; | |
358 | ||
359 | error_put_sess_tun: | |
360 | sock_put(ps->tunnel_sock); | |
361 | error_put_sess: | |
362 | sock_put(sk); | |
363 | error: | |
364 | return error; | |
365 | } | |
366 | ||
367 | /* Transmit function called by generic PPP driver. Sends PPP frame | |
368 | * over PPPoL2TP socket. | |
369 | * | |
370 | * This is almost the same as pppol2tp_sendmsg(), but rather than | |
371 | * being called with a msghdr from userspace, it is called with a skb | |
372 | * from the kernel. | |
373 | * | |
374 | * The supplied skb from ppp doesn't have enough headroom for the | |
375 | * insertion of L2TP, UDP and IP headers so we need to allocate more | |
376 | * headroom in the skb. This will create a cloned skb. But we must be | |
377 | * careful in the error case because the caller will expect to free | |
378 | * the skb it supplied, not our cloned skb. So we take care to always | |
379 | * leave the original skb unfreed if we return an error. | |
380 | */ | |
381 | static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb) | |
382 | { | |
383 | static const u8 ppph[2] = { 0xff, 0x03 }; | |
384 | struct sock *sk = (struct sock *) chan->private; | |
385 | struct sock *sk_tun; | |
fd558d18 JC |
386 | struct l2tp_session *session; |
387 | struct l2tp_tunnel *tunnel; | |
388 | struct pppol2tp_session *ps; | |
389 | int old_headroom; | |
390 | int new_headroom; | |
391 | ||
392 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
393 | goto abort; | |
394 | ||
395 | /* Get session and tunnel contexts from the socket */ | |
396 | session = pppol2tp_sock_to_session(sk); | |
397 | if (session == NULL) | |
398 | goto abort; | |
399 | ||
400 | ps = l2tp_session_priv(session); | |
401 | sk_tun = ps->tunnel_sock; | |
402 | if (sk_tun == NULL) | |
403 | goto abort_put_sess; | |
404 | tunnel = l2tp_sock_to_tunnel(sk_tun); | |
405 | if (tunnel == NULL) | |
406 | goto abort_put_sess; | |
407 | ||
fd558d18 JC |
408 | old_headroom = skb_headroom(skb); |
409 | if (skb_cow_head(skb, sizeof(ppph))) | |
410 | goto abort_put_sess_tun; | |
411 | ||
412 | new_headroom = skb_headroom(skb); | |
413 | skb->truesize += new_headroom - old_headroom; | |
414 | ||
415 | /* Setup PPP header */ | |
416 | __skb_push(skb, sizeof(ppph)); | |
417 | skb->data[0] = ppph[0]; | |
418 | skb->data[1] = ppph[1]; | |
419 | ||
e0d4435f | 420 | l2tp_xmit_skb(session, skb, session->hdr_len); |
fd558d18 JC |
421 | |
422 | sock_put(sk_tun); | |
423 | sock_put(sk); | |
424 | return 1; | |
425 | ||
426 | abort_put_sess_tun: | |
427 | sock_put(sk_tun); | |
428 | abort_put_sess: | |
429 | sock_put(sk); | |
430 | abort: | |
431 | /* Free the original skb */ | |
432 | kfree_skb(skb); | |
433 | return 1; | |
434 | } | |
435 | ||
436 | /***************************************************************************** | |
437 | * Session (and tunnel control) socket create/destroy. | |
438 | *****************************************************************************/ | |
439 | ||
440 | /* Called by l2tp_core when a session socket is being closed. | |
441 | */ | |
442 | static void pppol2tp_session_close(struct l2tp_session *session) | |
443 | { | |
444 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
445 | struct sock *sk = ps->sock; | |
446 | struct sk_buff *skb; | |
447 | ||
448 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
449 | ||
450 | if (session->session_id == 0) | |
451 | goto out; | |
452 | ||
453 | if (sk != NULL) { | |
454 | lock_sock(sk); | |
455 | ||
456 | if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) { | |
457 | pppox_unbind_sock(sk); | |
458 | sk->sk_state = PPPOX_DEAD; | |
459 | sk->sk_state_change(sk); | |
460 | } | |
461 | ||
462 | /* Purge any queued data */ | |
463 | skb_queue_purge(&sk->sk_receive_queue); | |
464 | skb_queue_purge(&sk->sk_write_queue); | |
465 | while ((skb = skb_dequeue(&session->reorder_q))) { | |
466 | kfree_skb(skb); | |
467 | sock_put(sk); | |
468 | } | |
469 | ||
470 | release_sock(sk); | |
471 | } | |
472 | ||
473 | out: | |
474 | return; | |
475 | } | |
476 | ||
477 | /* Really kill the session socket. (Called from sock_put() if | |
478 | * refcnt == 0.) | |
479 | */ | |
480 | static void pppol2tp_session_destruct(struct sock *sk) | |
481 | { | |
482 | struct l2tp_session *session; | |
483 | ||
484 | if (sk->sk_user_data != NULL) { | |
485 | session = sk->sk_user_data; | |
486 | if (session == NULL) | |
487 | goto out; | |
488 | ||
489 | sk->sk_user_data = NULL; | |
490 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
491 | l2tp_session_dec_refcount(session); | |
492 | } | |
493 | ||
494 | out: | |
495 | return; | |
496 | } | |
497 | ||
498 | /* Called when the PPPoX socket (session) is closed. | |
499 | */ | |
500 | static int pppol2tp_release(struct socket *sock) | |
501 | { | |
502 | struct sock *sk = sock->sk; | |
503 | struct l2tp_session *session; | |
504 | int error; | |
505 | ||
506 | if (!sk) | |
507 | return 0; | |
508 | ||
509 | error = -EBADF; | |
510 | lock_sock(sk); | |
511 | if (sock_flag(sk, SOCK_DEAD) != 0) | |
512 | goto error; | |
513 | ||
514 | pppox_unbind_sock(sk); | |
515 | ||
516 | /* Signal the death of the socket. */ | |
517 | sk->sk_state = PPPOX_DEAD; | |
518 | sock_orphan(sk); | |
519 | sock->sk = NULL; | |
520 | ||
521 | session = pppol2tp_sock_to_session(sk); | |
522 | ||
523 | /* Purge any queued data */ | |
524 | skb_queue_purge(&sk->sk_receive_queue); | |
525 | skb_queue_purge(&sk->sk_write_queue); | |
526 | if (session != NULL) { | |
527 | struct sk_buff *skb; | |
528 | while ((skb = skb_dequeue(&session->reorder_q))) { | |
529 | kfree_skb(skb); | |
530 | sock_put(sk); | |
531 | } | |
532 | sock_put(sk); | |
533 | } | |
534 | ||
535 | release_sock(sk); | |
536 | ||
537 | /* This will delete the session context via | |
538 | * pppol2tp_session_destruct() if the socket's refcnt drops to | |
539 | * zero. | |
540 | */ | |
541 | sock_put(sk); | |
542 | ||
543 | return 0; | |
544 | ||
545 | error: | |
546 | release_sock(sk); | |
547 | return error; | |
548 | } | |
549 | ||
550 | static struct proto pppol2tp_sk_proto = { | |
551 | .name = "PPPOL2TP", | |
552 | .owner = THIS_MODULE, | |
553 | .obj_size = sizeof(struct pppox_sock), | |
554 | }; | |
555 | ||
556 | static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb) | |
557 | { | |
558 | int rc; | |
559 | ||
560 | rc = l2tp_udp_encap_recv(sk, skb); | |
561 | if (rc) | |
562 | kfree_skb(skb); | |
563 | ||
564 | return NET_RX_SUCCESS; | |
565 | } | |
566 | ||
567 | /* socket() handler. Initialize a new struct sock. | |
568 | */ | |
569 | static int pppol2tp_create(struct net *net, struct socket *sock) | |
570 | { | |
571 | int error = -ENOMEM; | |
572 | struct sock *sk; | |
573 | ||
574 | sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto); | |
575 | if (!sk) | |
576 | goto out; | |
577 | ||
578 | sock_init_data(sock, sk); | |
579 | ||
580 | sock->state = SS_UNCONNECTED; | |
581 | sock->ops = &pppol2tp_ops; | |
582 | ||
583 | sk->sk_backlog_rcv = pppol2tp_backlog_recv; | |
584 | sk->sk_protocol = PX_PROTO_OL2TP; | |
585 | sk->sk_family = PF_PPPOX; | |
586 | sk->sk_state = PPPOX_NONE; | |
587 | sk->sk_type = SOCK_STREAM; | |
588 | sk->sk_destruct = pppol2tp_session_destruct; | |
589 | ||
590 | error = 0; | |
591 | ||
592 | out: | |
593 | return error; | |
594 | } | |
595 | ||
596 | /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket | |
597 | */ | |
598 | static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr, | |
599 | int sockaddr_len, int flags) | |
600 | { | |
601 | struct sock *sk = sock->sk; | |
602 | struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr; | |
e0d4435f | 603 | struct sockaddr_pppol2tpv3 *sp3 = (struct sockaddr_pppol2tpv3 *) uservaddr; |
fd558d18 JC |
604 | struct pppox_sock *po = pppox_sk(sk); |
605 | struct l2tp_session *session = NULL; | |
606 | struct l2tp_tunnel *tunnel; | |
607 | struct pppol2tp_session *ps; | |
608 | struct dst_entry *dst; | |
609 | struct l2tp_session_cfg cfg = { 0, }; | |
610 | int error = 0; | |
e0d4435f JC |
611 | u32 tunnel_id, peer_tunnel_id; |
612 | u32 session_id, peer_session_id; | |
613 | int ver = 2; | |
614 | int fd; | |
fd558d18 JC |
615 | |
616 | lock_sock(sk); | |
617 | ||
618 | error = -EINVAL; | |
619 | if (sp->sa_protocol != PX_PROTO_OL2TP) | |
620 | goto end; | |
621 | ||
622 | /* Check for already bound sockets */ | |
623 | error = -EBUSY; | |
624 | if (sk->sk_state & PPPOX_CONNECTED) | |
625 | goto end; | |
626 | ||
627 | /* We don't supporting rebinding anyway */ | |
628 | error = -EALREADY; | |
629 | if (sk->sk_user_data) | |
630 | goto end; /* socket is already attached */ | |
631 | ||
e0d4435f JC |
632 | /* Get params from socket address. Handle L2TPv2 and L2TPv3 */ |
633 | if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) { | |
634 | fd = sp->pppol2tp.fd; | |
635 | tunnel_id = sp->pppol2tp.s_tunnel; | |
636 | peer_tunnel_id = sp->pppol2tp.d_tunnel; | |
637 | session_id = sp->pppol2tp.s_session; | |
638 | peer_session_id = sp->pppol2tp.d_session; | |
639 | } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) { | |
640 | ver = 3; | |
641 | fd = sp3->pppol2tp.fd; | |
642 | tunnel_id = sp3->pppol2tp.s_tunnel; | |
643 | peer_tunnel_id = sp3->pppol2tp.d_tunnel; | |
644 | session_id = sp3->pppol2tp.s_session; | |
645 | peer_session_id = sp3->pppol2tp.d_session; | |
646 | } else { | |
647 | error = -EINVAL; | |
648 | goto end; /* bad socket address */ | |
649 | } | |
650 | ||
651 | /* Don't bind if tunnel_id is 0 */ | |
fd558d18 | 652 | error = -EINVAL; |
e0d4435f | 653 | if (tunnel_id == 0) |
fd558d18 JC |
654 | goto end; |
655 | ||
e0d4435f JC |
656 | /* Special case: create tunnel context if session_id and |
657 | * peer_session_id is 0. Otherwise look up tunnel using supplied | |
fd558d18 JC |
658 | * tunnel id. |
659 | */ | |
e0d4435f JC |
660 | if ((session_id == 0) && (peer_session_id == 0)) { |
661 | error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, NULL, &tunnel); | |
fd558d18 JC |
662 | if (error < 0) |
663 | goto end; | |
664 | } else { | |
e0d4435f | 665 | tunnel = l2tp_tunnel_find(sock_net(sk), tunnel_id); |
fd558d18 JC |
666 | |
667 | /* Error if we can't find the tunnel */ | |
668 | error = -ENOENT; | |
669 | if (tunnel == NULL) | |
670 | goto end; | |
671 | ||
672 | /* Error if socket is not prepped */ | |
673 | if (tunnel->sock == NULL) | |
674 | goto end; | |
675 | } | |
676 | ||
677 | if (tunnel->recv_payload_hook == NULL) | |
678 | tunnel->recv_payload_hook = pppol2tp_recv_payload_hook; | |
679 | ||
680 | /* Check that this session doesn't already exist */ | |
681 | error = -EEXIST; | |
e0d4435f | 682 | session = l2tp_session_find(sock_net(sk), tunnel, session_id); |
fd558d18 JC |
683 | if (session != NULL) |
684 | goto end; | |
685 | ||
e0d4435f JC |
686 | /* Default MTU values. */ |
687 | if (cfg.mtu == 0) | |
688 | cfg.mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD; | |
689 | if (cfg.mru == 0) | |
690 | cfg.mru = cfg.mtu; | |
fd558d18 JC |
691 | cfg.debug = tunnel->debug; |
692 | ||
693 | /* Allocate and initialize a new session context. */ | |
694 | session = l2tp_session_create(sizeof(struct pppol2tp_session), | |
e0d4435f JC |
695 | tunnel, session_id, |
696 | peer_session_id, &cfg); | |
fd558d18 JC |
697 | if (session == NULL) { |
698 | error = -ENOMEM; | |
699 | goto end; | |
700 | } | |
701 | ||
702 | ps = l2tp_session_priv(session); | |
703 | ps->owner = current->pid; | |
704 | ps->sock = sk; | |
705 | ps->tunnel_sock = tunnel->sock; | |
706 | ||
707 | session->recv_skb = pppol2tp_recv; | |
708 | session->session_close = pppol2tp_session_close; | |
709 | ||
710 | /* We need to know each time a skb is dropped from the reorder | |
711 | * queue. | |
712 | */ | |
713 | session->ref = pppol2tp_session_sock_hold; | |
714 | session->deref = pppol2tp_session_sock_put; | |
715 | ||
716 | /* If PMTU discovery was enabled, use the MTU that was discovered */ | |
717 | dst = sk_dst_get(sk); | |
718 | if (dst != NULL) { | |
719 | u32 pmtu = dst_mtu(__sk_dst_get(sk)); | |
720 | if (pmtu != 0) | |
721 | session->mtu = session->mru = pmtu - | |
722 | PPPOL2TP_HEADER_OVERHEAD; | |
723 | dst_release(dst); | |
724 | } | |
725 | ||
726 | /* Special case: if source & dest session_id == 0x0000, this | |
727 | * socket is being created to manage the tunnel. Just set up | |
728 | * the internal context for use by ioctl() and sockopt() | |
729 | * handlers. | |
730 | */ | |
731 | if ((session->session_id == 0) && | |
732 | (session->peer_session_id == 0)) { | |
733 | error = 0; | |
734 | goto out_no_ppp; | |
735 | } | |
736 | ||
737 | /* The only header we need to worry about is the L2TP | |
738 | * header. This size is different depending on whether | |
739 | * sequence numbers are enabled for the data channel. | |
740 | */ | |
741 | po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
742 | ||
743 | po->chan.private = sk; | |
744 | po->chan.ops = &pppol2tp_chan_ops; | |
745 | po->chan.mtu = session->mtu; | |
746 | ||
747 | error = ppp_register_net_channel(sock_net(sk), &po->chan); | |
748 | if (error) | |
749 | goto end; | |
750 | ||
751 | out_no_ppp: | |
752 | /* This is how we get the session context from the socket. */ | |
753 | sk->sk_user_data = session; | |
754 | sk->sk_state = PPPOX_CONNECTED; | |
755 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
756 | "%s: created\n", session->name); | |
757 | ||
758 | end: | |
759 | release_sock(sk); | |
760 | ||
761 | return error; | |
762 | } | |
763 | ||
764 | /* getname() support. | |
765 | */ | |
766 | static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr, | |
767 | int *usockaddr_len, int peer) | |
768 | { | |
e0d4435f | 769 | int len = 0; |
fd558d18 JC |
770 | int error = 0; |
771 | struct l2tp_session *session; | |
772 | struct l2tp_tunnel *tunnel; | |
773 | struct sock *sk = sock->sk; | |
774 | struct inet_sock *inet; | |
775 | struct pppol2tp_session *pls; | |
776 | ||
777 | error = -ENOTCONN; | |
778 | if (sk == NULL) | |
779 | goto end; | |
780 | if (sk->sk_state != PPPOX_CONNECTED) | |
781 | goto end; | |
782 | ||
783 | error = -EBADF; | |
784 | session = pppol2tp_sock_to_session(sk); | |
785 | if (session == NULL) | |
786 | goto end; | |
787 | ||
788 | pls = l2tp_session_priv(session); | |
789 | tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock); | |
790 | if (tunnel == NULL) { | |
791 | error = -EBADF; | |
792 | goto end_put_sess; | |
793 | } | |
794 | ||
fd558d18 | 795 | inet = inet_sk(sk); |
e0d4435f JC |
796 | if (tunnel->version == 2) { |
797 | struct sockaddr_pppol2tp sp; | |
798 | len = sizeof(sp); | |
799 | memset(&sp, 0, len); | |
800 | sp.sa_family = AF_PPPOX; | |
801 | sp.sa_protocol = PX_PROTO_OL2TP; | |
802 | sp.pppol2tp.fd = tunnel->fd; | |
803 | sp.pppol2tp.pid = pls->owner; | |
804 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
805 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
806 | sp.pppol2tp.s_session = session->session_id; | |
807 | sp.pppol2tp.d_session = session->peer_session_id; | |
808 | sp.pppol2tp.addr.sin_family = AF_INET; | |
809 | sp.pppol2tp.addr.sin_port = inet->inet_dport; | |
810 | sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr; | |
811 | memcpy(uaddr, &sp, len); | |
812 | } else if (tunnel->version == 3) { | |
813 | struct sockaddr_pppol2tpv3 sp; | |
814 | len = sizeof(sp); | |
815 | memset(&sp, 0, len); | |
816 | sp.sa_family = AF_PPPOX; | |
817 | sp.sa_protocol = PX_PROTO_OL2TP; | |
818 | sp.pppol2tp.fd = tunnel->fd; | |
819 | sp.pppol2tp.pid = pls->owner; | |
820 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
821 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
822 | sp.pppol2tp.s_session = session->session_id; | |
823 | sp.pppol2tp.d_session = session->peer_session_id; | |
824 | sp.pppol2tp.addr.sin_family = AF_INET; | |
825 | sp.pppol2tp.addr.sin_port = inet->inet_dport; | |
826 | sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr; | |
827 | memcpy(uaddr, &sp, len); | |
828 | } | |
fd558d18 JC |
829 | |
830 | *usockaddr_len = len; | |
831 | ||
832 | sock_put(pls->tunnel_sock); | |
833 | end_put_sess: | |
834 | sock_put(sk); | |
835 | error = 0; | |
836 | ||
837 | end: | |
838 | return error; | |
839 | } | |
840 | ||
841 | /**************************************************************************** | |
842 | * ioctl() handlers. | |
843 | * | |
844 | * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP | |
845 | * sockets. However, in order to control kernel tunnel features, we allow | |
846 | * userspace to create a special "tunnel" PPPoX socket which is used for | |
847 | * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow | |
848 | * the user application to issue L2TP setsockopt(), getsockopt() and ioctl() | |
849 | * calls. | |
850 | ****************************************************************************/ | |
851 | ||
852 | static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest, | |
853 | struct l2tp_stats *stats) | |
854 | { | |
855 | dest->tx_packets = stats->tx_packets; | |
856 | dest->tx_bytes = stats->tx_bytes; | |
857 | dest->tx_errors = stats->tx_errors; | |
858 | dest->rx_packets = stats->rx_packets; | |
859 | dest->rx_bytes = stats->rx_bytes; | |
860 | dest->rx_seq_discards = stats->rx_seq_discards; | |
861 | dest->rx_oos_packets = stats->rx_oos_packets; | |
862 | dest->rx_errors = stats->rx_errors; | |
863 | } | |
864 | ||
865 | /* Session ioctl helper. | |
866 | */ | |
867 | static int pppol2tp_session_ioctl(struct l2tp_session *session, | |
868 | unsigned int cmd, unsigned long arg) | |
869 | { | |
870 | struct ifreq ifr; | |
871 | int err = 0; | |
872 | struct sock *sk; | |
873 | int val = (int) arg; | |
874 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
875 | struct l2tp_tunnel *tunnel = session->tunnel; | |
876 | struct pppol2tp_ioc_stats stats; | |
877 | ||
878 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG, | |
879 | "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n", | |
880 | session->name, cmd, arg); | |
881 | ||
882 | sk = ps->sock; | |
883 | sock_hold(sk); | |
884 | ||
885 | switch (cmd) { | |
886 | case SIOCGIFMTU: | |
887 | err = -ENXIO; | |
888 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
889 | break; | |
890 | ||
891 | err = -EFAULT; | |
892 | if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq))) | |
893 | break; | |
894 | ifr.ifr_mtu = session->mtu; | |
895 | if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq))) | |
896 | break; | |
897 | ||
898 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
899 | "%s: get mtu=%d\n", session->name, session->mtu); | |
900 | err = 0; | |
901 | break; | |
902 | ||
903 | case SIOCSIFMTU: | |
904 | err = -ENXIO; | |
905 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
906 | break; | |
907 | ||
908 | err = -EFAULT; | |
909 | if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq))) | |
910 | break; | |
911 | ||
912 | session->mtu = ifr.ifr_mtu; | |
913 | ||
914 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
915 | "%s: set mtu=%d\n", session->name, session->mtu); | |
916 | err = 0; | |
917 | break; | |
918 | ||
919 | case PPPIOCGMRU: | |
920 | err = -ENXIO; | |
921 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
922 | break; | |
923 | ||
924 | err = -EFAULT; | |
925 | if (put_user(session->mru, (int __user *) arg)) | |
926 | break; | |
927 | ||
928 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
929 | "%s: get mru=%d\n", session->name, session->mru); | |
930 | err = 0; | |
931 | break; | |
932 | ||
933 | case PPPIOCSMRU: | |
934 | err = -ENXIO; | |
935 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
936 | break; | |
937 | ||
938 | err = -EFAULT; | |
939 | if (get_user(val, (int __user *) arg)) | |
940 | break; | |
941 | ||
942 | session->mru = val; | |
943 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
944 | "%s: set mru=%d\n", session->name, session->mru); | |
945 | err = 0; | |
946 | break; | |
947 | ||
948 | case PPPIOCGFLAGS: | |
949 | err = -EFAULT; | |
950 | if (put_user(ps->flags, (int __user *) arg)) | |
951 | break; | |
952 | ||
953 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
954 | "%s: get flags=%d\n", session->name, ps->flags); | |
955 | err = 0; | |
956 | break; | |
957 | ||
958 | case PPPIOCSFLAGS: | |
959 | err = -EFAULT; | |
960 | if (get_user(val, (int __user *) arg)) | |
961 | break; | |
962 | ps->flags = val; | |
963 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
964 | "%s: set flags=%d\n", session->name, ps->flags); | |
965 | err = 0; | |
966 | break; | |
967 | ||
968 | case PPPIOCGL2TPSTATS: | |
969 | err = -ENXIO; | |
970 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
971 | break; | |
972 | ||
973 | memset(&stats, 0, sizeof(stats)); | |
974 | stats.tunnel_id = tunnel->tunnel_id; | |
975 | stats.session_id = session->session_id; | |
976 | pppol2tp_copy_stats(&stats, &session->stats); | |
977 | if (copy_to_user((void __user *) arg, &stats, | |
978 | sizeof(stats))) | |
979 | break; | |
980 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
981 | "%s: get L2TP stats\n", session->name); | |
982 | err = 0; | |
983 | break; | |
984 | ||
985 | default: | |
986 | err = -ENOSYS; | |
987 | break; | |
988 | } | |
989 | ||
990 | sock_put(sk); | |
991 | ||
992 | return err; | |
993 | } | |
994 | ||
995 | /* Tunnel ioctl helper. | |
996 | * | |
997 | * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data | |
998 | * specifies a session_id, the session ioctl handler is called. This allows an | |
999 | * application to retrieve session stats via a tunnel socket. | |
1000 | */ | |
1001 | static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel, | |
1002 | unsigned int cmd, unsigned long arg) | |
1003 | { | |
1004 | int err = 0; | |
1005 | struct sock *sk; | |
1006 | struct pppol2tp_ioc_stats stats; | |
1007 | ||
1008 | PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG, | |
1009 | "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n", | |
1010 | tunnel->name, cmd, arg); | |
1011 | ||
1012 | sk = tunnel->sock; | |
1013 | sock_hold(sk); | |
1014 | ||
1015 | switch (cmd) { | |
1016 | case PPPIOCGL2TPSTATS: | |
1017 | err = -ENXIO; | |
1018 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1019 | break; | |
1020 | ||
1021 | if (copy_from_user(&stats, (void __user *) arg, | |
1022 | sizeof(stats))) { | |
1023 | err = -EFAULT; | |
1024 | break; | |
1025 | } | |
1026 | if (stats.session_id != 0) { | |
1027 | /* resend to session ioctl handler */ | |
1028 | struct l2tp_session *session = | |
f7faffa3 | 1029 | l2tp_session_find(sock_net(sk), tunnel, stats.session_id); |
fd558d18 JC |
1030 | if (session != NULL) |
1031 | err = pppol2tp_session_ioctl(session, cmd, arg); | |
1032 | else | |
1033 | err = -EBADR; | |
1034 | break; | |
1035 | } | |
1036 | #ifdef CONFIG_XFRM | |
1037 | stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0; | |
1038 | #endif | |
1039 | pppol2tp_copy_stats(&stats, &tunnel->stats); | |
1040 | if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) { | |
1041 | err = -EFAULT; | |
1042 | break; | |
1043 | } | |
1044 | PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1045 | "%s: get L2TP stats\n", tunnel->name); | |
1046 | err = 0; | |
1047 | break; | |
1048 | ||
1049 | default: | |
1050 | err = -ENOSYS; | |
1051 | break; | |
1052 | } | |
1053 | ||
1054 | sock_put(sk); | |
1055 | ||
1056 | return err; | |
1057 | } | |
1058 | ||
1059 | /* Main ioctl() handler. | |
1060 | * Dispatch to tunnel or session helpers depending on the socket. | |
1061 | */ | |
1062 | static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd, | |
1063 | unsigned long arg) | |
1064 | { | |
1065 | struct sock *sk = sock->sk; | |
1066 | struct l2tp_session *session; | |
1067 | struct l2tp_tunnel *tunnel; | |
1068 | struct pppol2tp_session *ps; | |
1069 | int err; | |
1070 | ||
1071 | if (!sk) | |
1072 | return 0; | |
1073 | ||
1074 | err = -EBADF; | |
1075 | if (sock_flag(sk, SOCK_DEAD) != 0) | |
1076 | goto end; | |
1077 | ||
1078 | err = -ENOTCONN; | |
1079 | if ((sk->sk_user_data == NULL) || | |
1080 | (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)))) | |
1081 | goto end; | |
1082 | ||
1083 | /* Get session context from the socket */ | |
1084 | err = -EBADF; | |
1085 | session = pppol2tp_sock_to_session(sk); | |
1086 | if (session == NULL) | |
1087 | goto end; | |
1088 | ||
1089 | /* Special case: if session's session_id is zero, treat ioctl as a | |
1090 | * tunnel ioctl | |
1091 | */ | |
1092 | ps = l2tp_session_priv(session); | |
1093 | if ((session->session_id == 0) && | |
1094 | (session->peer_session_id == 0)) { | |
1095 | err = -EBADF; | |
1096 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
1097 | if (tunnel == NULL) | |
1098 | goto end_put_sess; | |
1099 | ||
1100 | err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg); | |
1101 | sock_put(ps->tunnel_sock); | |
1102 | goto end_put_sess; | |
1103 | } | |
1104 | ||
1105 | err = pppol2tp_session_ioctl(session, cmd, arg); | |
1106 | ||
1107 | end_put_sess: | |
1108 | sock_put(sk); | |
1109 | end: | |
1110 | return err; | |
1111 | } | |
1112 | ||
1113 | /***************************************************************************** | |
1114 | * setsockopt() / getsockopt() support. | |
1115 | * | |
1116 | * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP | |
1117 | * sockets. In order to control kernel tunnel features, we allow userspace to | |
1118 | * create a special "tunnel" PPPoX socket which is used for control only. | |
1119 | * Tunnel PPPoX sockets have session_id == 0 and simply allow the user | |
1120 | * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls. | |
1121 | *****************************************************************************/ | |
1122 | ||
1123 | /* Tunnel setsockopt() helper. | |
1124 | */ | |
1125 | static int pppol2tp_tunnel_setsockopt(struct sock *sk, | |
1126 | struct l2tp_tunnel *tunnel, | |
1127 | int optname, int val) | |
1128 | { | |
1129 | int err = 0; | |
1130 | ||
1131 | switch (optname) { | |
1132 | case PPPOL2TP_SO_DEBUG: | |
1133 | tunnel->debug = val; | |
1134 | PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1135 | "%s: set debug=%x\n", tunnel->name, tunnel->debug); | |
1136 | break; | |
1137 | ||
1138 | default: | |
1139 | err = -ENOPROTOOPT; | |
1140 | break; | |
1141 | } | |
1142 | ||
1143 | return err; | |
1144 | } | |
1145 | ||
1146 | /* Session setsockopt helper. | |
1147 | */ | |
1148 | static int pppol2tp_session_setsockopt(struct sock *sk, | |
1149 | struct l2tp_session *session, | |
1150 | int optname, int val) | |
1151 | { | |
1152 | int err = 0; | |
1153 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
1154 | ||
1155 | switch (optname) { | |
1156 | case PPPOL2TP_SO_RECVSEQ: | |
1157 | if ((val != 0) && (val != 1)) { | |
1158 | err = -EINVAL; | |
1159 | break; | |
1160 | } | |
1161 | session->recv_seq = val ? -1 : 0; | |
1162 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1163 | "%s: set recv_seq=%d\n", session->name, session->recv_seq); | |
1164 | break; | |
1165 | ||
1166 | case PPPOL2TP_SO_SENDSEQ: | |
1167 | if ((val != 0) && (val != 1)) { | |
1168 | err = -EINVAL; | |
1169 | break; | |
1170 | } | |
1171 | session->send_seq = val ? -1 : 0; | |
1172 | { | |
1173 | struct sock *ssk = ps->sock; | |
1174 | struct pppox_sock *po = pppox_sk(ssk); | |
1175 | po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ : | |
1176 | PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
1177 | } | |
1178 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1179 | "%s: set send_seq=%d\n", session->name, session->send_seq); | |
1180 | break; | |
1181 | ||
1182 | case PPPOL2TP_SO_LNSMODE: | |
1183 | if ((val != 0) && (val != 1)) { | |
1184 | err = -EINVAL; | |
1185 | break; | |
1186 | } | |
1187 | session->lns_mode = val ? -1 : 0; | |
1188 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1189 | "%s: set lns_mode=%d\n", session->name, session->lns_mode); | |
1190 | break; | |
1191 | ||
1192 | case PPPOL2TP_SO_DEBUG: | |
1193 | session->debug = val; | |
1194 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1195 | "%s: set debug=%x\n", session->name, session->debug); | |
1196 | break; | |
1197 | ||
1198 | case PPPOL2TP_SO_REORDERTO: | |
1199 | session->reorder_timeout = msecs_to_jiffies(val); | |
1200 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1201 | "%s: set reorder_timeout=%d\n", session->name, session->reorder_timeout); | |
1202 | break; | |
1203 | ||
1204 | default: | |
1205 | err = -ENOPROTOOPT; | |
1206 | break; | |
1207 | } | |
1208 | ||
1209 | return err; | |
1210 | } | |
1211 | ||
1212 | /* Main setsockopt() entry point. | |
1213 | * Does API checks, then calls either the tunnel or session setsockopt | |
1214 | * handler, according to whether the PPPoL2TP socket is a for a regular | |
1215 | * session or the special tunnel type. | |
1216 | */ | |
1217 | static int pppol2tp_setsockopt(struct socket *sock, int level, int optname, | |
1218 | char __user *optval, unsigned int optlen) | |
1219 | { | |
1220 | struct sock *sk = sock->sk; | |
1221 | struct l2tp_session *session; | |
1222 | struct l2tp_tunnel *tunnel; | |
1223 | struct pppol2tp_session *ps; | |
1224 | int val; | |
1225 | int err; | |
1226 | ||
1227 | if (level != SOL_PPPOL2TP) | |
1228 | return udp_prot.setsockopt(sk, level, optname, optval, optlen); | |
1229 | ||
1230 | if (optlen < sizeof(int)) | |
1231 | return -EINVAL; | |
1232 | ||
1233 | if (get_user(val, (int __user *)optval)) | |
1234 | return -EFAULT; | |
1235 | ||
1236 | err = -ENOTCONN; | |
1237 | if (sk->sk_user_data == NULL) | |
1238 | goto end; | |
1239 | ||
1240 | /* Get session context from the socket */ | |
1241 | err = -EBADF; | |
1242 | session = pppol2tp_sock_to_session(sk); | |
1243 | if (session == NULL) | |
1244 | goto end; | |
1245 | ||
1246 | /* Special case: if session_id == 0x0000, treat as operation on tunnel | |
1247 | */ | |
1248 | ps = l2tp_session_priv(session); | |
1249 | if ((session->session_id == 0) && | |
1250 | (session->peer_session_id == 0)) { | |
1251 | err = -EBADF; | |
1252 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
1253 | if (tunnel == NULL) | |
1254 | goto end_put_sess; | |
1255 | ||
1256 | err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val); | |
1257 | sock_put(ps->tunnel_sock); | |
1258 | } else | |
1259 | err = pppol2tp_session_setsockopt(sk, session, optname, val); | |
1260 | ||
1261 | err = 0; | |
1262 | ||
1263 | end_put_sess: | |
1264 | sock_put(sk); | |
1265 | end: | |
1266 | return err; | |
1267 | } | |
1268 | ||
1269 | /* Tunnel getsockopt helper. Called with sock locked. | |
1270 | */ | |
1271 | static int pppol2tp_tunnel_getsockopt(struct sock *sk, | |
1272 | struct l2tp_tunnel *tunnel, | |
1273 | int optname, int *val) | |
1274 | { | |
1275 | int err = 0; | |
1276 | ||
1277 | switch (optname) { | |
1278 | case PPPOL2TP_SO_DEBUG: | |
1279 | *val = tunnel->debug; | |
1280 | PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1281 | "%s: get debug=%x\n", tunnel->name, tunnel->debug); | |
1282 | break; | |
1283 | ||
1284 | default: | |
1285 | err = -ENOPROTOOPT; | |
1286 | break; | |
1287 | } | |
1288 | ||
1289 | return err; | |
1290 | } | |
1291 | ||
1292 | /* Session getsockopt helper. Called with sock locked. | |
1293 | */ | |
1294 | static int pppol2tp_session_getsockopt(struct sock *sk, | |
1295 | struct l2tp_session *session, | |
1296 | int optname, int *val) | |
1297 | { | |
1298 | int err = 0; | |
1299 | ||
1300 | switch (optname) { | |
1301 | case PPPOL2TP_SO_RECVSEQ: | |
1302 | *val = session->recv_seq; | |
1303 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1304 | "%s: get recv_seq=%d\n", session->name, *val); | |
1305 | break; | |
1306 | ||
1307 | case PPPOL2TP_SO_SENDSEQ: | |
1308 | *val = session->send_seq; | |
1309 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1310 | "%s: get send_seq=%d\n", session->name, *val); | |
1311 | break; | |
1312 | ||
1313 | case PPPOL2TP_SO_LNSMODE: | |
1314 | *val = session->lns_mode; | |
1315 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1316 | "%s: get lns_mode=%d\n", session->name, *val); | |
1317 | break; | |
1318 | ||
1319 | case PPPOL2TP_SO_DEBUG: | |
1320 | *val = session->debug; | |
1321 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1322 | "%s: get debug=%d\n", session->name, *val); | |
1323 | break; | |
1324 | ||
1325 | case PPPOL2TP_SO_REORDERTO: | |
1326 | *val = (int) jiffies_to_msecs(session->reorder_timeout); | |
1327 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1328 | "%s: get reorder_timeout=%d\n", session->name, *val); | |
1329 | break; | |
1330 | ||
1331 | default: | |
1332 | err = -ENOPROTOOPT; | |
1333 | } | |
1334 | ||
1335 | return err; | |
1336 | } | |
1337 | ||
1338 | /* Main getsockopt() entry point. | |
1339 | * Does API checks, then calls either the tunnel or session getsockopt | |
1340 | * handler, according to whether the PPPoX socket is a for a regular session | |
1341 | * or the special tunnel type. | |
1342 | */ | |
1343 | static int pppol2tp_getsockopt(struct socket *sock, int level, | |
1344 | int optname, char __user *optval, int __user *optlen) | |
1345 | { | |
1346 | struct sock *sk = sock->sk; | |
1347 | struct l2tp_session *session; | |
1348 | struct l2tp_tunnel *tunnel; | |
1349 | int val, len; | |
1350 | int err; | |
1351 | struct pppol2tp_session *ps; | |
1352 | ||
1353 | if (level != SOL_PPPOL2TP) | |
1354 | return udp_prot.getsockopt(sk, level, optname, optval, optlen); | |
1355 | ||
1356 | if (get_user(len, (int __user *) optlen)) | |
1357 | return -EFAULT; | |
1358 | ||
1359 | len = min_t(unsigned int, len, sizeof(int)); | |
1360 | ||
1361 | if (len < 0) | |
1362 | return -EINVAL; | |
1363 | ||
1364 | err = -ENOTCONN; | |
1365 | if (sk->sk_user_data == NULL) | |
1366 | goto end; | |
1367 | ||
1368 | /* Get the session context */ | |
1369 | err = -EBADF; | |
1370 | session = pppol2tp_sock_to_session(sk); | |
1371 | if (session == NULL) | |
1372 | goto end; | |
1373 | ||
1374 | /* Special case: if session_id == 0x0000, treat as operation on tunnel */ | |
1375 | ps = l2tp_session_priv(session); | |
1376 | if ((session->session_id == 0) && | |
1377 | (session->peer_session_id == 0)) { | |
1378 | err = -EBADF; | |
1379 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
1380 | if (tunnel == NULL) | |
1381 | goto end_put_sess; | |
1382 | ||
1383 | err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val); | |
1384 | sock_put(ps->tunnel_sock); | |
1385 | } else | |
1386 | err = pppol2tp_session_getsockopt(sk, session, optname, &val); | |
1387 | ||
1388 | err = -EFAULT; | |
1389 | if (put_user(len, (int __user *) optlen)) | |
1390 | goto end_put_sess; | |
1391 | ||
1392 | if (copy_to_user((void __user *) optval, &val, len)) | |
1393 | goto end_put_sess; | |
1394 | ||
1395 | err = 0; | |
1396 | ||
1397 | end_put_sess: | |
1398 | sock_put(sk); | |
1399 | end: | |
1400 | return err; | |
1401 | } | |
1402 | ||
1403 | /***************************************************************************** | |
1404 | * /proc filesystem for debug | |
f7faffa3 JC |
1405 | * Since the original pppol2tp driver provided /proc/net/pppol2tp for |
1406 | * L2TPv2, we dump only L2TPv2 tunnels and sessions here. | |
fd558d18 JC |
1407 | *****************************************************************************/ |
1408 | ||
1409 | static unsigned int pppol2tp_net_id; | |
1410 | ||
1411 | #ifdef CONFIG_PROC_FS | |
1412 | ||
1413 | struct pppol2tp_seq_data { | |
1414 | struct seq_net_private p; | |
1415 | int tunnel_idx; /* current tunnel */ | |
1416 | int session_idx; /* index of session within current tunnel */ | |
1417 | struct l2tp_tunnel *tunnel; | |
1418 | struct l2tp_session *session; /* NULL means get next tunnel */ | |
1419 | }; | |
1420 | ||
1421 | static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd) | |
1422 | { | |
f7faffa3 JC |
1423 | for (;;) { |
1424 | pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx); | |
1425 | pd->tunnel_idx++; | |
1426 | ||
1427 | if (pd->tunnel == NULL) | |
1428 | break; | |
1429 | ||
1430 | /* Ignore L2TPv3 tunnels */ | |
1431 | if (pd->tunnel->version < 3) | |
1432 | break; | |
1433 | } | |
fd558d18 JC |
1434 | } |
1435 | ||
1436 | static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd) | |
1437 | { | |
1438 | pd->session = l2tp_session_find_nth(pd->tunnel, pd->session_idx); | |
1439 | pd->session_idx++; | |
f7faffa3 | 1440 | |
fd558d18 JC |
1441 | if (pd->session == NULL) { |
1442 | pd->session_idx = 0; | |
1443 | pppol2tp_next_tunnel(net, pd); | |
1444 | } | |
1445 | } | |
1446 | ||
1447 | static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs) | |
1448 | { | |
1449 | struct pppol2tp_seq_data *pd = SEQ_START_TOKEN; | |
1450 | loff_t pos = *offs; | |
1451 | struct net *net; | |
1452 | ||
1453 | if (!pos) | |
1454 | goto out; | |
1455 | ||
1456 | BUG_ON(m->private == NULL); | |
1457 | pd = m->private; | |
1458 | net = seq_file_net(m); | |
1459 | ||
1460 | if (pd->tunnel == NULL) | |
1461 | pppol2tp_next_tunnel(net, pd); | |
1462 | else | |
1463 | pppol2tp_next_session(net, pd); | |
1464 | ||
1465 | /* NULL tunnel and session indicates end of list */ | |
1466 | if ((pd->tunnel == NULL) && (pd->session == NULL)) | |
1467 | pd = NULL; | |
1468 | ||
1469 | out: | |
1470 | return pd; | |
1471 | } | |
1472 | ||
1473 | static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
1474 | { | |
1475 | (*pos)++; | |
1476 | return NULL; | |
1477 | } | |
1478 | ||
1479 | static void pppol2tp_seq_stop(struct seq_file *p, void *v) | |
1480 | { | |
1481 | /* nothing to do */ | |
1482 | } | |
1483 | ||
1484 | static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v) | |
1485 | { | |
1486 | struct l2tp_tunnel *tunnel = v; | |
1487 | ||
1488 | seq_printf(m, "\nTUNNEL '%s', %c %d\n", | |
1489 | tunnel->name, | |
1490 | (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N', | |
1491 | atomic_read(&tunnel->ref_count) - 1); | |
1492 | seq_printf(m, " %08x %llu/%llu/%llu %llu/%llu/%llu\n", | |
1493 | tunnel->debug, | |
1494 | (unsigned long long)tunnel->stats.tx_packets, | |
1495 | (unsigned long long)tunnel->stats.tx_bytes, | |
1496 | (unsigned long long)tunnel->stats.tx_errors, | |
1497 | (unsigned long long)tunnel->stats.rx_packets, | |
1498 | (unsigned long long)tunnel->stats.rx_bytes, | |
1499 | (unsigned long long)tunnel->stats.rx_errors); | |
1500 | } | |
1501 | ||
1502 | static void pppol2tp_seq_session_show(struct seq_file *m, void *v) | |
1503 | { | |
1504 | struct l2tp_session *session = v; | |
1505 | struct l2tp_tunnel *tunnel = session->tunnel; | |
1506 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
9345471b | 1507 | struct pppox_sock *po = pppox_sk(ps->sock); |
fd558d18 JC |
1508 | u32 ip = 0; |
1509 | u16 port = 0; | |
1510 | ||
1511 | if (tunnel->sock) { | |
1512 | struct inet_sock *inet = inet_sk(tunnel->sock); | |
1513 | ip = ntohl(inet->inet_saddr); | |
1514 | port = ntohs(inet->inet_sport); | |
1515 | } | |
1516 | ||
1517 | seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> " | |
1518 | "%04X/%04X %d %c\n", | |
1519 | session->name, ip, port, | |
1520 | tunnel->tunnel_id, | |
1521 | session->session_id, | |
1522 | tunnel->peer_tunnel_id, | |
1523 | session->peer_session_id, | |
1524 | ps->sock->sk_state, | |
1525 | (session == ps->sock->sk_user_data) ? | |
1526 | 'Y' : 'N'); | |
1527 | seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n", | |
1528 | session->mtu, session->mru, | |
1529 | session->recv_seq ? 'R' : '-', | |
1530 | session->send_seq ? 'S' : '-', | |
1531 | session->lns_mode ? "LNS" : "LAC", | |
1532 | session->debug, | |
1533 | jiffies_to_msecs(session->reorder_timeout)); | |
1534 | seq_printf(m, " %hu/%hu %llu/%llu/%llu %llu/%llu/%llu\n", | |
1535 | session->nr, session->ns, | |
1536 | (unsigned long long)session->stats.tx_packets, | |
1537 | (unsigned long long)session->stats.tx_bytes, | |
1538 | (unsigned long long)session->stats.tx_errors, | |
1539 | (unsigned long long)session->stats.rx_packets, | |
1540 | (unsigned long long)session->stats.rx_bytes, | |
1541 | (unsigned long long)session->stats.rx_errors); | |
9345471b JC |
1542 | |
1543 | if (po) | |
1544 | seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan)); | |
fd558d18 JC |
1545 | } |
1546 | ||
1547 | static int pppol2tp_seq_show(struct seq_file *m, void *v) | |
1548 | { | |
1549 | struct pppol2tp_seq_data *pd = v; | |
1550 | ||
1551 | /* display header on line 1 */ | |
1552 | if (v == SEQ_START_TOKEN) { | |
1553 | seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n"); | |
1554 | seq_puts(m, "TUNNEL name, user-data-ok session-count\n"); | |
1555 | seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
1556 | seq_puts(m, " SESSION name, addr/port src-tid/sid " | |
1557 | "dest-tid/sid state user-data-ok\n"); | |
1558 | seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n"); | |
1559 | seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
1560 | goto out; | |
1561 | } | |
1562 | ||
1563 | /* Show the tunnel or session context. | |
1564 | */ | |
1565 | if (pd->session == NULL) | |
1566 | pppol2tp_seq_tunnel_show(m, pd->tunnel); | |
1567 | else | |
1568 | pppol2tp_seq_session_show(m, pd->session); | |
1569 | ||
1570 | out: | |
1571 | return 0; | |
1572 | } | |
1573 | ||
1574 | static const struct seq_operations pppol2tp_seq_ops = { | |
1575 | .start = pppol2tp_seq_start, | |
1576 | .next = pppol2tp_seq_next, | |
1577 | .stop = pppol2tp_seq_stop, | |
1578 | .show = pppol2tp_seq_show, | |
1579 | }; | |
1580 | ||
1581 | /* Called when our /proc file is opened. We allocate data for use when | |
1582 | * iterating our tunnel / session contexts and store it in the private | |
1583 | * data of the seq_file. | |
1584 | */ | |
1585 | static int pppol2tp_proc_open(struct inode *inode, struct file *file) | |
1586 | { | |
1587 | return seq_open_net(inode, file, &pppol2tp_seq_ops, | |
1588 | sizeof(struct pppol2tp_seq_data)); | |
1589 | } | |
1590 | ||
1591 | static const struct file_operations pppol2tp_proc_fops = { | |
1592 | .owner = THIS_MODULE, | |
1593 | .open = pppol2tp_proc_open, | |
1594 | .read = seq_read, | |
1595 | .llseek = seq_lseek, | |
1596 | .release = seq_release_net, | |
1597 | }; | |
1598 | ||
1599 | #endif /* CONFIG_PROC_FS */ | |
1600 | ||
1601 | /***************************************************************************** | |
1602 | * Network namespace | |
1603 | *****************************************************************************/ | |
1604 | ||
1605 | static __net_init int pppol2tp_init_net(struct net *net) | |
1606 | { | |
1607 | struct proc_dir_entry *pde; | |
1608 | int err = 0; | |
1609 | ||
1610 | pde = proc_net_fops_create(net, "pppol2tp", S_IRUGO, &pppol2tp_proc_fops); | |
1611 | if (!pde) { | |
1612 | err = -ENOMEM; | |
1613 | goto out; | |
1614 | } | |
1615 | ||
1616 | out: | |
1617 | return err; | |
1618 | } | |
1619 | ||
1620 | static __net_exit void pppol2tp_exit_net(struct net *net) | |
1621 | { | |
1622 | proc_net_remove(net, "pppol2tp"); | |
1623 | } | |
1624 | ||
1625 | static struct pernet_operations pppol2tp_net_ops = { | |
1626 | .init = pppol2tp_init_net, | |
1627 | .exit = pppol2tp_exit_net, | |
1628 | .id = &pppol2tp_net_id, | |
1629 | }; | |
1630 | ||
1631 | /***************************************************************************** | |
1632 | * Init and cleanup | |
1633 | *****************************************************************************/ | |
1634 | ||
1635 | static const struct proto_ops pppol2tp_ops = { | |
1636 | .family = AF_PPPOX, | |
1637 | .owner = THIS_MODULE, | |
1638 | .release = pppol2tp_release, | |
1639 | .bind = sock_no_bind, | |
1640 | .connect = pppol2tp_connect, | |
1641 | .socketpair = sock_no_socketpair, | |
1642 | .accept = sock_no_accept, | |
1643 | .getname = pppol2tp_getname, | |
1644 | .poll = datagram_poll, | |
1645 | .listen = sock_no_listen, | |
1646 | .shutdown = sock_no_shutdown, | |
1647 | .setsockopt = pppol2tp_setsockopt, | |
1648 | .getsockopt = pppol2tp_getsockopt, | |
1649 | .sendmsg = pppol2tp_sendmsg, | |
1650 | .recvmsg = pppol2tp_recvmsg, | |
1651 | .mmap = sock_no_mmap, | |
1652 | .ioctl = pppox_ioctl, | |
1653 | }; | |
1654 | ||
1655 | static struct pppox_proto pppol2tp_proto = { | |
1656 | .create = pppol2tp_create, | |
1657 | .ioctl = pppol2tp_ioctl | |
1658 | }; | |
1659 | ||
1660 | static int __init pppol2tp_init(void) | |
1661 | { | |
1662 | int err; | |
1663 | ||
1664 | err = register_pernet_device(&pppol2tp_net_ops); | |
1665 | if (err) | |
1666 | goto out; | |
1667 | ||
1668 | err = proto_register(&pppol2tp_sk_proto, 0); | |
1669 | if (err) | |
1670 | goto out_unregister_pppol2tp_pernet; | |
1671 | ||
1672 | err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto); | |
1673 | if (err) | |
1674 | goto out_unregister_pppol2tp_proto; | |
1675 | ||
1676 | printk(KERN_INFO "PPPoL2TP kernel driver, %s\n", | |
1677 | PPPOL2TP_DRV_VERSION); | |
1678 | ||
1679 | out: | |
1680 | return err; | |
1681 | out_unregister_pppol2tp_proto: | |
1682 | proto_unregister(&pppol2tp_sk_proto); | |
1683 | out_unregister_pppol2tp_pernet: | |
1684 | unregister_pernet_device(&pppol2tp_net_ops); | |
1685 | goto out; | |
1686 | } | |
1687 | ||
1688 | static void __exit pppol2tp_exit(void) | |
1689 | { | |
1690 | unregister_pppox_proto(PX_PROTO_OL2TP); | |
1691 | proto_unregister(&pppol2tp_sk_proto); | |
1692 | unregister_pernet_device(&pppol2tp_net_ops); | |
1693 | } | |
1694 | ||
1695 | module_init(pppol2tp_init); | |
1696 | module_exit(pppol2tp_exit); | |
1697 | ||
1698 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); | |
1699 | MODULE_DESCRIPTION("PPP over L2TP over UDP"); | |
1700 | MODULE_LICENSE("GPL"); | |
1701 | MODULE_VERSION(PPPOL2TP_DRV_VERSION); |