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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> | |
4b32da2b | 85 | #include <linux/ppp-ioctl.h> |
fd558d18 JC |
86 | #include <linux/file.h> |
87 | #include <linux/hash.h> | |
88 | #include <linux/sort.h> | |
89 | #include <linux/proc_fs.h> | |
309795f4 | 90 | #include <linux/l2tp.h> |
fd558d18 JC |
91 | #include <linux/nsproxy.h> |
92 | #include <net/net_namespace.h> | |
93 | #include <net/netns/generic.h> | |
94 | #include <net/dst.h> | |
95 | #include <net/ip.h> | |
96 | #include <net/udp.h> | |
97 | #include <net/xfrm.h> | |
98 | ||
99 | #include <asm/byteorder.h> | |
60063497 | 100 | #include <linux/atomic.h> |
fd558d18 JC |
101 | |
102 | #include "l2tp_core.h" | |
103 | ||
104 | #define PPPOL2TP_DRV_VERSION "V2.0" | |
105 | ||
106 | /* Space for UDP, L2TP and PPP headers */ | |
107 | #define PPPOL2TP_HEADER_OVERHEAD 40 | |
108 | ||
109 | #define PRINTK(_mask, _type, _lvl, _fmt, args...) \ | |
110 | do { \ | |
111 | if ((_mask) & (_type)) \ | |
112 | printk(_lvl "PPPOL2TP: " _fmt, ##args); \ | |
113 | } while (0) | |
114 | ||
115 | /* Number of bytes to build transmit L2TP headers. | |
116 | * Unfortunately the size is different depending on whether sequence numbers | |
117 | * are enabled. | |
118 | */ | |
119 | #define PPPOL2TP_L2TP_HDR_SIZE_SEQ 10 | |
120 | #define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ 6 | |
121 | ||
122 | /* Private data of each session. This data lives at the end of struct | |
123 | * l2tp_session, referenced via session->priv[]. | |
124 | */ | |
125 | struct pppol2tp_session { | |
126 | int owner; /* pid that opened the socket */ | |
127 | ||
128 | struct sock *sock; /* Pointer to the session | |
129 | * PPPoX socket */ | |
130 | struct sock *tunnel_sock; /* Pointer to the tunnel UDP | |
131 | * socket */ | |
132 | int flags; /* accessed by PPPIOCGFLAGS. | |
133 | * Unused. */ | |
134 | }; | |
135 | ||
136 | static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb); | |
137 | ||
d7100da0 | 138 | static const struct ppp_channel_ops pppol2tp_chan_ops = { |
139 | .start_xmit = pppol2tp_xmit, | |
140 | }; | |
141 | ||
fd558d18 JC |
142 | static const struct proto_ops pppol2tp_ops; |
143 | ||
144 | /* Helpers to obtain tunnel/session contexts from sockets. | |
145 | */ | |
146 | static inline struct l2tp_session *pppol2tp_sock_to_session(struct sock *sk) | |
147 | { | |
148 | struct l2tp_session *session; | |
149 | ||
150 | if (sk == NULL) | |
151 | return NULL; | |
152 | ||
153 | sock_hold(sk); | |
154 | session = (struct l2tp_session *)(sk->sk_user_data); | |
155 | if (session == NULL) { | |
156 | sock_put(sk); | |
157 | goto out; | |
158 | } | |
159 | ||
160 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
161 | ||
162 | out: | |
163 | return session; | |
164 | } | |
165 | ||
166 | /***************************************************************************** | |
167 | * Receive data handling | |
168 | *****************************************************************************/ | |
169 | ||
170 | static int pppol2tp_recv_payload_hook(struct sk_buff *skb) | |
171 | { | |
172 | /* Skip PPP header, if present. In testing, Microsoft L2TP clients | |
173 | * don't send the PPP header (PPP header compression enabled), but | |
174 | * other clients can include the header. So we cope with both cases | |
175 | * here. The PPP header is always FF03 when using L2TP. | |
176 | * | |
177 | * Note that skb->data[] isn't dereferenced from a u16 ptr here since | |
178 | * the field may be unaligned. | |
179 | */ | |
180 | if (!pskb_may_pull(skb, 2)) | |
181 | return 1; | |
182 | ||
183 | if ((skb->data[0] == 0xff) && (skb->data[1] == 0x03)) | |
184 | skb_pull(skb, 2); | |
185 | ||
186 | return 0; | |
187 | } | |
188 | ||
189 | /* Receive message. This is the recvmsg for the PPPoL2TP socket. | |
190 | */ | |
191 | static int pppol2tp_recvmsg(struct kiocb *iocb, struct socket *sock, | |
192 | struct msghdr *msg, size_t len, | |
193 | int flags) | |
194 | { | |
195 | int err; | |
196 | struct sk_buff *skb; | |
197 | struct sock *sk = sock->sk; | |
198 | ||
199 | err = -EIO; | |
200 | if (sk->sk_state & PPPOX_BOUND) | |
201 | goto end; | |
202 | ||
203 | msg->msg_namelen = 0; | |
204 | ||
205 | err = 0; | |
206 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
207 | flags & MSG_DONTWAIT, &err); | |
208 | if (!skb) | |
209 | goto end; | |
210 | ||
211 | if (len > skb->len) | |
212 | len = skb->len; | |
213 | else if (len < skb->len) | |
214 | msg->msg_flags |= MSG_TRUNC; | |
215 | ||
216 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len); | |
217 | if (likely(err == 0)) | |
218 | err = len; | |
219 | ||
220 | kfree_skb(skb); | |
221 | end: | |
222 | return err; | |
223 | } | |
224 | ||
225 | static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len) | |
226 | { | |
227 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
228 | struct sock *sk = NULL; | |
229 | ||
230 | /* If the socket is bound, send it in to PPP's input queue. Otherwise | |
231 | * queue it on the session socket. | |
232 | */ | |
233 | sk = ps->sock; | |
234 | if (sk == NULL) | |
235 | goto no_sock; | |
236 | ||
237 | if (sk->sk_state & PPPOX_BOUND) { | |
238 | struct pppox_sock *po; | |
239 | PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG, | |
240 | "%s: recv %d byte data frame, passing to ppp\n", | |
241 | session->name, data_len); | |
242 | ||
243 | /* We need to forget all info related to the L2TP packet | |
244 | * gathered in the skb as we are going to reuse the same | |
245 | * skb for the inner packet. | |
246 | * Namely we need to: | |
247 | * - reset xfrm (IPSec) information as it applies to | |
248 | * the outer L2TP packet and not to the inner one | |
249 | * - release the dst to force a route lookup on the inner | |
250 | * IP packet since skb->dst currently points to the dst | |
251 | * of the UDP tunnel | |
252 | * - reset netfilter information as it doesn't apply | |
253 | * to the inner packet either | |
254 | */ | |
255 | secpath_reset(skb); | |
256 | skb_dst_drop(skb); | |
257 | nf_reset(skb); | |
258 | ||
259 | po = pppox_sk(sk); | |
260 | ppp_input(&po->chan, skb); | |
261 | } else { | |
262 | PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_INFO, | |
263 | "%s: socket not bound\n", session->name); | |
264 | ||
265 | /* Not bound. Nothing we can do, so discard. */ | |
266 | session->stats.rx_errors++; | |
267 | kfree_skb(skb); | |
268 | } | |
269 | ||
270 | return; | |
271 | ||
272 | no_sock: | |
273 | PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_INFO, | |
274 | "%s: no socket\n", session->name); | |
275 | kfree_skb(skb); | |
276 | } | |
277 | ||
278 | static void pppol2tp_session_sock_hold(struct l2tp_session *session) | |
279 | { | |
280 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
281 | ||
282 | if (ps->sock) | |
283 | sock_hold(ps->sock); | |
284 | } | |
285 | ||
286 | static void pppol2tp_session_sock_put(struct l2tp_session *session) | |
287 | { | |
288 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
289 | ||
290 | if (ps->sock) | |
291 | sock_put(ps->sock); | |
292 | } | |
293 | ||
294 | /************************************************************************ | |
295 | * Transmit handling | |
296 | ***********************************************************************/ | |
297 | ||
fd558d18 JC |
298 | /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here |
299 | * when a user application does a sendmsg() on the session socket. L2TP and | |
300 | * PPP headers must be inserted into the user's data. | |
301 | */ | |
302 | static int pppol2tp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
303 | size_t total_len) | |
304 | { | |
305 | static const unsigned char ppph[2] = { 0xff, 0x03 }; | |
306 | struct sock *sk = sock->sk; | |
307 | struct sk_buff *skb; | |
308 | int error; | |
309 | struct l2tp_session *session; | |
310 | struct l2tp_tunnel *tunnel; | |
311 | struct pppol2tp_session *ps; | |
0d76751f | 312 | int uhlen; |
fd558d18 JC |
313 | |
314 | error = -ENOTCONN; | |
315 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
316 | goto error; | |
317 | ||
318 | /* Get session and tunnel contexts */ | |
319 | error = -EBADF; | |
320 | session = pppol2tp_sock_to_session(sk); | |
321 | if (session == NULL) | |
322 | goto error; | |
323 | ||
324 | ps = l2tp_session_priv(session); | |
325 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
326 | if (tunnel == NULL) | |
327 | goto error_put_sess; | |
328 | ||
0d76751f JC |
329 | uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0; |
330 | ||
fd558d18 JC |
331 | /* Allocate a socket buffer */ |
332 | error = -ENOMEM; | |
333 | skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) + | |
0d76751f | 334 | uhlen + session->hdr_len + |
fd558d18 JC |
335 | sizeof(ppph) + total_len, |
336 | 0, GFP_KERNEL); | |
337 | if (!skb) | |
338 | goto error_put_sess_tun; | |
339 | ||
340 | /* Reserve space for headers. */ | |
341 | skb_reserve(skb, NET_SKB_PAD); | |
342 | skb_reset_network_header(skb); | |
343 | skb_reserve(skb, sizeof(struct iphdr)); | |
344 | skb_reset_transport_header(skb); | |
0d76751f | 345 | skb_reserve(skb, uhlen); |
fd558d18 JC |
346 | |
347 | /* Add PPP header */ | |
348 | skb->data[0] = ppph[0]; | |
349 | skb->data[1] = ppph[1]; | |
350 | skb_put(skb, 2); | |
351 | ||
352 | /* Copy user data into skb */ | |
353 | error = memcpy_fromiovec(skb->data, m->msg_iov, total_len); | |
354 | if (error < 0) { | |
355 | kfree_skb(skb); | |
356 | goto error_put_sess_tun; | |
357 | } | |
358 | skb_put(skb, total_len); | |
359 | ||
360 | l2tp_xmit_skb(session, skb, session->hdr_len); | |
361 | ||
362 | sock_put(ps->tunnel_sock); | |
363 | ||
364 | return error; | |
365 | ||
366 | error_put_sess_tun: | |
367 | sock_put(ps->tunnel_sock); | |
368 | error_put_sess: | |
369 | sock_put(sk); | |
370 | error: | |
371 | return error; | |
372 | } | |
373 | ||
374 | /* Transmit function called by generic PPP driver. Sends PPP frame | |
375 | * over PPPoL2TP socket. | |
376 | * | |
377 | * This is almost the same as pppol2tp_sendmsg(), but rather than | |
378 | * being called with a msghdr from userspace, it is called with a skb | |
379 | * from the kernel. | |
380 | * | |
381 | * The supplied skb from ppp doesn't have enough headroom for the | |
382 | * insertion of L2TP, UDP and IP headers so we need to allocate more | |
383 | * headroom in the skb. This will create a cloned skb. But we must be | |
384 | * careful in the error case because the caller will expect to free | |
385 | * the skb it supplied, not our cloned skb. So we take care to always | |
386 | * leave the original skb unfreed if we return an error. | |
387 | */ | |
388 | static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb) | |
389 | { | |
390 | static const u8 ppph[2] = { 0xff, 0x03 }; | |
391 | struct sock *sk = (struct sock *) chan->private; | |
392 | struct sock *sk_tun; | |
fd558d18 JC |
393 | struct l2tp_session *session; |
394 | struct l2tp_tunnel *tunnel; | |
395 | struct pppol2tp_session *ps; | |
396 | int old_headroom; | |
397 | int new_headroom; | |
09df57ca | 398 | int uhlen, headroom; |
fd558d18 JC |
399 | |
400 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
401 | goto abort; | |
402 | ||
403 | /* Get session and tunnel contexts from the socket */ | |
404 | session = pppol2tp_sock_to_session(sk); | |
405 | if (session == NULL) | |
406 | goto abort; | |
407 | ||
408 | ps = l2tp_session_priv(session); | |
409 | sk_tun = ps->tunnel_sock; | |
410 | if (sk_tun == NULL) | |
411 | goto abort_put_sess; | |
412 | tunnel = l2tp_sock_to_tunnel(sk_tun); | |
413 | if (tunnel == NULL) | |
414 | goto abort_put_sess; | |
415 | ||
fd558d18 | 416 | old_headroom = skb_headroom(skb); |
09df57ca ED |
417 | uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0; |
418 | headroom = NET_SKB_PAD + | |
419 | sizeof(struct iphdr) + /* IP header */ | |
420 | uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */ | |
421 | session->hdr_len + /* L2TP header */ | |
422 | sizeof(ppph); /* PPP header */ | |
423 | if (skb_cow_head(skb, headroom)) | |
fd558d18 JC |
424 | goto abort_put_sess_tun; |
425 | ||
426 | new_headroom = skb_headroom(skb); | |
427 | skb->truesize += new_headroom - old_headroom; | |
428 | ||
429 | /* Setup PPP header */ | |
430 | __skb_push(skb, sizeof(ppph)); | |
431 | skb->data[0] = ppph[0]; | |
432 | skb->data[1] = ppph[1]; | |
433 | ||
e0d4435f | 434 | l2tp_xmit_skb(session, skb, session->hdr_len); |
fd558d18 JC |
435 | |
436 | sock_put(sk_tun); | |
437 | sock_put(sk); | |
438 | return 1; | |
439 | ||
440 | abort_put_sess_tun: | |
441 | sock_put(sk_tun); | |
442 | abort_put_sess: | |
443 | sock_put(sk); | |
444 | abort: | |
445 | /* Free the original skb */ | |
446 | kfree_skb(skb); | |
447 | return 1; | |
448 | } | |
449 | ||
450 | /***************************************************************************** | |
451 | * Session (and tunnel control) socket create/destroy. | |
452 | *****************************************************************************/ | |
453 | ||
454 | /* Called by l2tp_core when a session socket is being closed. | |
455 | */ | |
456 | static void pppol2tp_session_close(struct l2tp_session *session) | |
457 | { | |
458 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
459 | struct sock *sk = ps->sock; | |
460 | struct sk_buff *skb; | |
461 | ||
462 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
463 | ||
464 | if (session->session_id == 0) | |
465 | goto out; | |
466 | ||
467 | if (sk != NULL) { | |
468 | lock_sock(sk); | |
469 | ||
470 | if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) { | |
471 | pppox_unbind_sock(sk); | |
472 | sk->sk_state = PPPOX_DEAD; | |
473 | sk->sk_state_change(sk); | |
474 | } | |
475 | ||
476 | /* Purge any queued data */ | |
477 | skb_queue_purge(&sk->sk_receive_queue); | |
478 | skb_queue_purge(&sk->sk_write_queue); | |
479 | while ((skb = skb_dequeue(&session->reorder_q))) { | |
480 | kfree_skb(skb); | |
481 | sock_put(sk); | |
482 | } | |
483 | ||
484 | release_sock(sk); | |
485 | } | |
486 | ||
487 | out: | |
488 | return; | |
489 | } | |
490 | ||
491 | /* Really kill the session socket. (Called from sock_put() if | |
492 | * refcnt == 0.) | |
493 | */ | |
494 | static void pppol2tp_session_destruct(struct sock *sk) | |
495 | { | |
496 | struct l2tp_session *session; | |
497 | ||
498 | if (sk->sk_user_data != NULL) { | |
499 | session = sk->sk_user_data; | |
500 | if (session == NULL) | |
501 | goto out; | |
502 | ||
503 | sk->sk_user_data = NULL; | |
504 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
505 | l2tp_session_dec_refcount(session); | |
506 | } | |
507 | ||
508 | out: | |
509 | return; | |
510 | } | |
511 | ||
512 | /* Called when the PPPoX socket (session) is closed. | |
513 | */ | |
514 | static int pppol2tp_release(struct socket *sock) | |
515 | { | |
516 | struct sock *sk = sock->sk; | |
517 | struct l2tp_session *session; | |
518 | int error; | |
519 | ||
520 | if (!sk) | |
521 | return 0; | |
522 | ||
523 | error = -EBADF; | |
524 | lock_sock(sk); | |
525 | if (sock_flag(sk, SOCK_DEAD) != 0) | |
526 | goto error; | |
527 | ||
528 | pppox_unbind_sock(sk); | |
529 | ||
530 | /* Signal the death of the socket. */ | |
531 | sk->sk_state = PPPOX_DEAD; | |
532 | sock_orphan(sk); | |
533 | sock->sk = NULL; | |
534 | ||
535 | session = pppol2tp_sock_to_session(sk); | |
536 | ||
537 | /* Purge any queued data */ | |
538 | skb_queue_purge(&sk->sk_receive_queue); | |
539 | skb_queue_purge(&sk->sk_write_queue); | |
540 | if (session != NULL) { | |
541 | struct sk_buff *skb; | |
542 | while ((skb = skb_dequeue(&session->reorder_q))) { | |
543 | kfree_skb(skb); | |
544 | sock_put(sk); | |
545 | } | |
546 | sock_put(sk); | |
547 | } | |
548 | ||
549 | release_sock(sk); | |
550 | ||
551 | /* This will delete the session context via | |
552 | * pppol2tp_session_destruct() if the socket's refcnt drops to | |
553 | * zero. | |
554 | */ | |
555 | sock_put(sk); | |
556 | ||
557 | return 0; | |
558 | ||
559 | error: | |
560 | release_sock(sk); | |
561 | return error; | |
562 | } | |
563 | ||
564 | static struct proto pppol2tp_sk_proto = { | |
565 | .name = "PPPOL2TP", | |
566 | .owner = THIS_MODULE, | |
567 | .obj_size = sizeof(struct pppox_sock), | |
568 | }; | |
569 | ||
570 | static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb) | |
571 | { | |
572 | int rc; | |
573 | ||
574 | rc = l2tp_udp_encap_recv(sk, skb); | |
575 | if (rc) | |
576 | kfree_skb(skb); | |
577 | ||
578 | return NET_RX_SUCCESS; | |
579 | } | |
580 | ||
581 | /* socket() handler. Initialize a new struct sock. | |
582 | */ | |
583 | static int pppol2tp_create(struct net *net, struct socket *sock) | |
584 | { | |
585 | int error = -ENOMEM; | |
586 | struct sock *sk; | |
587 | ||
588 | sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto); | |
589 | if (!sk) | |
590 | goto out; | |
591 | ||
592 | sock_init_data(sock, sk); | |
593 | ||
594 | sock->state = SS_UNCONNECTED; | |
595 | sock->ops = &pppol2tp_ops; | |
596 | ||
597 | sk->sk_backlog_rcv = pppol2tp_backlog_recv; | |
598 | sk->sk_protocol = PX_PROTO_OL2TP; | |
599 | sk->sk_family = PF_PPPOX; | |
600 | sk->sk_state = PPPOX_NONE; | |
601 | sk->sk_type = SOCK_STREAM; | |
602 | sk->sk_destruct = pppol2tp_session_destruct; | |
603 | ||
604 | error = 0; | |
605 | ||
606 | out: | |
607 | return error; | |
608 | } | |
609 | ||
f66ef2d0 | 610 | #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE) |
0ad66140 JC |
611 | static void pppol2tp_show(struct seq_file *m, void *arg) |
612 | { | |
613 | struct l2tp_session *session = arg; | |
614 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
615 | ||
616 | if (ps) { | |
617 | struct pppox_sock *po = pppox_sk(ps->sock); | |
618 | if (po) | |
619 | seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan)); | |
620 | } | |
621 | } | |
622 | #endif | |
623 | ||
fd558d18 JC |
624 | /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket |
625 | */ | |
626 | static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr, | |
627 | int sockaddr_len, int flags) | |
628 | { | |
629 | struct sock *sk = sock->sk; | |
630 | struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr; | |
631 | struct pppox_sock *po = pppox_sk(sk); | |
632 | struct l2tp_session *session = NULL; | |
633 | struct l2tp_tunnel *tunnel; | |
634 | struct pppol2tp_session *ps; | |
635 | struct dst_entry *dst; | |
636 | struct l2tp_session_cfg cfg = { 0, }; | |
637 | int error = 0; | |
e0d4435f JC |
638 | u32 tunnel_id, peer_tunnel_id; |
639 | u32 session_id, peer_session_id; | |
640 | int ver = 2; | |
641 | int fd; | |
fd558d18 JC |
642 | |
643 | lock_sock(sk); | |
644 | ||
645 | error = -EINVAL; | |
646 | if (sp->sa_protocol != PX_PROTO_OL2TP) | |
647 | goto end; | |
648 | ||
649 | /* Check for already bound sockets */ | |
650 | error = -EBUSY; | |
651 | if (sk->sk_state & PPPOX_CONNECTED) | |
652 | goto end; | |
653 | ||
654 | /* We don't supporting rebinding anyway */ | |
655 | error = -EALREADY; | |
656 | if (sk->sk_user_data) | |
657 | goto end; /* socket is already attached */ | |
658 | ||
b79585f5 JC |
659 | /* Get params from socket address. Handle L2TPv2 and L2TPv3. |
660 | * This is nasty because there are different sockaddr_pppol2tp | |
661 | * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use | |
662 | * the sockaddr size to determine which structure the caller | |
663 | * is using. | |
664 | */ | |
665 | peer_tunnel_id = 0; | |
e0d4435f JC |
666 | if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) { |
667 | fd = sp->pppol2tp.fd; | |
668 | tunnel_id = sp->pppol2tp.s_tunnel; | |
669 | peer_tunnel_id = sp->pppol2tp.d_tunnel; | |
670 | session_id = sp->pppol2tp.s_session; | |
671 | peer_session_id = sp->pppol2tp.d_session; | |
672 | } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) { | |
b79585f5 JC |
673 | struct sockaddr_pppol2tpv3 *sp3 = |
674 | (struct sockaddr_pppol2tpv3 *) sp; | |
e0d4435f JC |
675 | ver = 3; |
676 | fd = sp3->pppol2tp.fd; | |
677 | tunnel_id = sp3->pppol2tp.s_tunnel; | |
678 | peer_tunnel_id = sp3->pppol2tp.d_tunnel; | |
679 | session_id = sp3->pppol2tp.s_session; | |
680 | peer_session_id = sp3->pppol2tp.d_session; | |
b79585f5 JC |
681 | } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpin6)) { |
682 | struct sockaddr_pppol2tpin6 *sp6 = | |
683 | (struct sockaddr_pppol2tpin6 *) sp; | |
684 | fd = sp6->pppol2tp.fd; | |
685 | tunnel_id = sp6->pppol2tp.s_tunnel; | |
686 | peer_tunnel_id = sp6->pppol2tp.d_tunnel; | |
687 | session_id = sp6->pppol2tp.s_session; | |
688 | peer_session_id = sp6->pppol2tp.d_session; | |
689 | } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3in6)) { | |
690 | struct sockaddr_pppol2tpv3in6 *sp6 = | |
691 | (struct sockaddr_pppol2tpv3in6 *) sp; | |
692 | ver = 3; | |
693 | fd = sp6->pppol2tp.fd; | |
694 | tunnel_id = sp6->pppol2tp.s_tunnel; | |
695 | peer_tunnel_id = sp6->pppol2tp.d_tunnel; | |
696 | session_id = sp6->pppol2tp.s_session; | |
697 | peer_session_id = sp6->pppol2tp.d_session; | |
e0d4435f JC |
698 | } else { |
699 | error = -EINVAL; | |
700 | goto end; /* bad socket address */ | |
701 | } | |
702 | ||
703 | /* Don't bind if tunnel_id is 0 */ | |
fd558d18 | 704 | error = -EINVAL; |
e0d4435f | 705 | if (tunnel_id == 0) |
fd558d18 JC |
706 | goto end; |
707 | ||
309795f4 JC |
708 | tunnel = l2tp_tunnel_find(sock_net(sk), tunnel_id); |
709 | ||
e0d4435f JC |
710 | /* Special case: create tunnel context if session_id and |
711 | * peer_session_id is 0. Otherwise look up tunnel using supplied | |
fd558d18 JC |
712 | * tunnel id. |
713 | */ | |
e0d4435f | 714 | if ((session_id == 0) && (peer_session_id == 0)) { |
309795f4 JC |
715 | if (tunnel == NULL) { |
716 | struct l2tp_tunnel_cfg tcfg = { | |
717 | .encap = L2TP_ENCAPTYPE_UDP, | |
718 | .debug = 0, | |
719 | }; | |
720 | error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel); | |
721 | if (error < 0) | |
722 | goto end; | |
723 | } | |
fd558d18 | 724 | } else { |
fd558d18 JC |
725 | /* Error if we can't find the tunnel */ |
726 | error = -ENOENT; | |
727 | if (tunnel == NULL) | |
728 | goto end; | |
729 | ||
730 | /* Error if socket is not prepped */ | |
731 | if (tunnel->sock == NULL) | |
732 | goto end; | |
733 | } | |
734 | ||
735 | if (tunnel->recv_payload_hook == NULL) | |
736 | tunnel->recv_payload_hook = pppol2tp_recv_payload_hook; | |
737 | ||
b79585f5 JC |
738 | if (tunnel->peer_tunnel_id == 0) |
739 | tunnel->peer_tunnel_id = peer_tunnel_id; | |
fd558d18 | 740 | |
309795f4 JC |
741 | /* Create session if it doesn't already exist. We handle the |
742 | * case where a session was previously created by the netlink | |
743 | * interface by checking that the session doesn't already have | |
744 | * a socket and its tunnel socket are what we expect. If any | |
745 | * of those checks fail, return EEXIST to the caller. | |
746 | */ | |
747 | session = l2tp_session_find(sock_net(sk), tunnel, session_id); | |
fd558d18 | 748 | if (session == NULL) { |
309795f4 JC |
749 | /* Default MTU must allow space for UDP/L2TP/PPP |
750 | * headers. | |
751 | */ | |
752 | cfg.mtu = cfg.mru = 1500 - PPPOL2TP_HEADER_OVERHEAD; | |
753 | ||
754 | /* Allocate and initialize a new session context. */ | |
755 | session = l2tp_session_create(sizeof(struct pppol2tp_session), | |
756 | tunnel, session_id, | |
757 | peer_session_id, &cfg); | |
758 | if (session == NULL) { | |
759 | error = -ENOMEM; | |
760 | goto end; | |
761 | } | |
762 | } else { | |
763 | ps = l2tp_session_priv(session); | |
764 | error = -EEXIST; | |
765 | if (ps->sock != NULL) | |
766 | goto end; | |
767 | ||
768 | /* consistency checks */ | |
769 | if (ps->tunnel_sock != tunnel->sock) | |
770 | goto end; | |
fd558d18 JC |
771 | } |
772 | ||
309795f4 | 773 | /* Associate session with its PPPoL2TP socket */ |
fd558d18 JC |
774 | ps = l2tp_session_priv(session); |
775 | ps->owner = current->pid; | |
776 | ps->sock = sk; | |
777 | ps->tunnel_sock = tunnel->sock; | |
778 | ||
779 | session->recv_skb = pppol2tp_recv; | |
780 | session->session_close = pppol2tp_session_close; | |
f66ef2d0 | 781 | #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE) |
0ad66140 JC |
782 | session->show = pppol2tp_show; |
783 | #endif | |
fd558d18 JC |
784 | |
785 | /* We need to know each time a skb is dropped from the reorder | |
786 | * queue. | |
787 | */ | |
788 | session->ref = pppol2tp_session_sock_hold; | |
789 | session->deref = pppol2tp_session_sock_put; | |
790 | ||
791 | /* If PMTU discovery was enabled, use the MTU that was discovered */ | |
792 | dst = sk_dst_get(sk); | |
793 | if (dst != NULL) { | |
794 | u32 pmtu = dst_mtu(__sk_dst_get(sk)); | |
795 | if (pmtu != 0) | |
796 | session->mtu = session->mru = pmtu - | |
797 | PPPOL2TP_HEADER_OVERHEAD; | |
798 | dst_release(dst); | |
799 | } | |
800 | ||
801 | /* Special case: if source & dest session_id == 0x0000, this | |
802 | * socket is being created to manage the tunnel. Just set up | |
803 | * the internal context for use by ioctl() and sockopt() | |
804 | * handlers. | |
805 | */ | |
806 | if ((session->session_id == 0) && | |
807 | (session->peer_session_id == 0)) { | |
808 | error = 0; | |
809 | goto out_no_ppp; | |
810 | } | |
811 | ||
812 | /* The only header we need to worry about is the L2TP | |
813 | * header. This size is different depending on whether | |
814 | * sequence numbers are enabled for the data channel. | |
815 | */ | |
816 | po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
817 | ||
818 | po->chan.private = sk; | |
819 | po->chan.ops = &pppol2tp_chan_ops; | |
820 | po->chan.mtu = session->mtu; | |
821 | ||
822 | error = ppp_register_net_channel(sock_net(sk), &po->chan); | |
823 | if (error) | |
824 | goto end; | |
825 | ||
826 | out_no_ppp: | |
827 | /* This is how we get the session context from the socket. */ | |
828 | sk->sk_user_data = session; | |
829 | sk->sk_state = PPPOX_CONNECTED; | |
830 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
831 | "%s: created\n", session->name); | |
832 | ||
833 | end: | |
834 | release_sock(sk); | |
835 | ||
836 | return error; | |
837 | } | |
838 | ||
309795f4 JC |
839 | #ifdef CONFIG_L2TP_V3 |
840 | ||
841 | /* Called when creating sessions via the netlink interface. | |
842 | */ | |
843 | static int pppol2tp_session_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg) | |
844 | { | |
845 | int error; | |
846 | struct l2tp_tunnel *tunnel; | |
847 | struct l2tp_session *session; | |
848 | struct pppol2tp_session *ps; | |
849 | ||
850 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
851 | ||
852 | /* Error if we can't find the tunnel */ | |
853 | error = -ENOENT; | |
854 | if (tunnel == NULL) | |
855 | goto out; | |
856 | ||
857 | /* Error if tunnel socket is not prepped */ | |
858 | if (tunnel->sock == NULL) | |
859 | goto out; | |
860 | ||
861 | /* Check that this session doesn't already exist */ | |
862 | error = -EEXIST; | |
863 | session = l2tp_session_find(net, tunnel, session_id); | |
864 | if (session != NULL) | |
865 | goto out; | |
866 | ||
867 | /* Default MTU values. */ | |
868 | if (cfg->mtu == 0) | |
869 | cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD; | |
870 | if (cfg->mru == 0) | |
871 | cfg->mru = cfg->mtu; | |
872 | ||
873 | /* Allocate and initialize a new session context. */ | |
874 | error = -ENOMEM; | |
875 | session = l2tp_session_create(sizeof(struct pppol2tp_session), | |
876 | tunnel, session_id, | |
877 | peer_session_id, cfg); | |
878 | if (session == NULL) | |
879 | goto out; | |
880 | ||
881 | ps = l2tp_session_priv(session); | |
882 | ps->tunnel_sock = tunnel->sock; | |
883 | ||
884 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
885 | "%s: created\n", session->name); | |
886 | ||
887 | error = 0; | |
888 | ||
889 | out: | |
890 | return error; | |
891 | } | |
892 | ||
893 | /* Called when deleting sessions via the netlink interface. | |
894 | */ | |
895 | static int pppol2tp_session_delete(struct l2tp_session *session) | |
896 | { | |
897 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
898 | ||
899 | if (ps->sock == NULL) | |
900 | l2tp_session_dec_refcount(session); | |
901 | ||
902 | return 0; | |
903 | } | |
904 | ||
905 | #endif /* CONFIG_L2TP_V3 */ | |
906 | ||
fd558d18 JC |
907 | /* getname() support. |
908 | */ | |
909 | static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr, | |
910 | int *usockaddr_len, int peer) | |
911 | { | |
e0d4435f | 912 | int len = 0; |
fd558d18 JC |
913 | int error = 0; |
914 | struct l2tp_session *session; | |
915 | struct l2tp_tunnel *tunnel; | |
916 | struct sock *sk = sock->sk; | |
917 | struct inet_sock *inet; | |
918 | struct pppol2tp_session *pls; | |
919 | ||
920 | error = -ENOTCONN; | |
921 | if (sk == NULL) | |
922 | goto end; | |
923 | if (sk->sk_state != PPPOX_CONNECTED) | |
924 | goto end; | |
925 | ||
926 | error = -EBADF; | |
927 | session = pppol2tp_sock_to_session(sk); | |
928 | if (session == NULL) | |
929 | goto end; | |
930 | ||
931 | pls = l2tp_session_priv(session); | |
932 | tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock); | |
933 | if (tunnel == NULL) { | |
934 | error = -EBADF; | |
935 | goto end_put_sess; | |
936 | } | |
937 | ||
bbdb32cb | 938 | inet = inet_sk(tunnel->sock); |
d2cf3361 | 939 | if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) { |
e0d4435f JC |
940 | struct sockaddr_pppol2tp sp; |
941 | len = sizeof(sp); | |
942 | memset(&sp, 0, len); | |
943 | sp.sa_family = AF_PPPOX; | |
944 | sp.sa_protocol = PX_PROTO_OL2TP; | |
945 | sp.pppol2tp.fd = tunnel->fd; | |
946 | sp.pppol2tp.pid = pls->owner; | |
947 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
948 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
949 | sp.pppol2tp.s_session = session->session_id; | |
950 | sp.pppol2tp.d_session = session->peer_session_id; | |
951 | sp.pppol2tp.addr.sin_family = AF_INET; | |
952 | sp.pppol2tp.addr.sin_port = inet->inet_dport; | |
953 | sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr; | |
954 | memcpy(uaddr, &sp, len); | |
d2cf3361 BL |
955 | #if IS_ENABLED(CONFIG_IPV6) |
956 | } else if ((tunnel->version == 2) && | |
957 | (tunnel->sock->sk_family == AF_INET6)) { | |
958 | struct ipv6_pinfo *np = inet6_sk(tunnel->sock); | |
959 | struct sockaddr_pppol2tpin6 sp; | |
960 | len = sizeof(sp); | |
961 | memset(&sp, 0, len); | |
962 | sp.sa_family = AF_PPPOX; | |
963 | sp.sa_protocol = PX_PROTO_OL2TP; | |
964 | sp.pppol2tp.fd = tunnel->fd; | |
965 | sp.pppol2tp.pid = pls->owner; | |
966 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
967 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
968 | sp.pppol2tp.s_session = session->session_id; | |
969 | sp.pppol2tp.d_session = session->peer_session_id; | |
970 | sp.pppol2tp.addr.sin6_family = AF_INET6; | |
971 | sp.pppol2tp.addr.sin6_port = inet->inet_dport; | |
972 | memcpy(&sp.pppol2tp.addr.sin6_addr, &np->daddr, | |
973 | sizeof(np->daddr)); | |
974 | memcpy(uaddr, &sp, len); | |
975 | } else if ((tunnel->version == 3) && | |
976 | (tunnel->sock->sk_family == AF_INET6)) { | |
977 | struct ipv6_pinfo *np = inet6_sk(tunnel->sock); | |
978 | struct sockaddr_pppol2tpv3in6 sp; | |
979 | len = sizeof(sp); | |
980 | memset(&sp, 0, len); | |
981 | sp.sa_family = AF_PPPOX; | |
982 | sp.sa_protocol = PX_PROTO_OL2TP; | |
983 | sp.pppol2tp.fd = tunnel->fd; | |
984 | sp.pppol2tp.pid = pls->owner; | |
985 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
986 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
987 | sp.pppol2tp.s_session = session->session_id; | |
988 | sp.pppol2tp.d_session = session->peer_session_id; | |
989 | sp.pppol2tp.addr.sin6_family = AF_INET6; | |
990 | sp.pppol2tp.addr.sin6_port = inet->inet_dport; | |
991 | memcpy(&sp.pppol2tp.addr.sin6_addr, &np->daddr, | |
992 | sizeof(np->daddr)); | |
993 | memcpy(uaddr, &sp, len); | |
994 | #endif | |
e0d4435f JC |
995 | } else if (tunnel->version == 3) { |
996 | struct sockaddr_pppol2tpv3 sp; | |
997 | len = sizeof(sp); | |
998 | memset(&sp, 0, len); | |
999 | sp.sa_family = AF_PPPOX; | |
1000 | sp.sa_protocol = PX_PROTO_OL2TP; | |
1001 | sp.pppol2tp.fd = tunnel->fd; | |
1002 | sp.pppol2tp.pid = pls->owner; | |
1003 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
1004 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
1005 | sp.pppol2tp.s_session = session->session_id; | |
1006 | sp.pppol2tp.d_session = session->peer_session_id; | |
1007 | sp.pppol2tp.addr.sin_family = AF_INET; | |
1008 | sp.pppol2tp.addr.sin_port = inet->inet_dport; | |
1009 | sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr; | |
1010 | memcpy(uaddr, &sp, len); | |
1011 | } | |
fd558d18 JC |
1012 | |
1013 | *usockaddr_len = len; | |
1014 | ||
1015 | sock_put(pls->tunnel_sock); | |
1016 | end_put_sess: | |
1017 | sock_put(sk); | |
1018 | error = 0; | |
1019 | ||
1020 | end: | |
1021 | return error; | |
1022 | } | |
1023 | ||
1024 | /**************************************************************************** | |
1025 | * ioctl() handlers. | |
1026 | * | |
1027 | * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP | |
1028 | * sockets. However, in order to control kernel tunnel features, we allow | |
1029 | * userspace to create a special "tunnel" PPPoX socket which is used for | |
1030 | * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow | |
1031 | * the user application to issue L2TP setsockopt(), getsockopt() and ioctl() | |
1032 | * calls. | |
1033 | ****************************************************************************/ | |
1034 | ||
1035 | static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest, | |
1036 | struct l2tp_stats *stats) | |
1037 | { | |
1038 | dest->tx_packets = stats->tx_packets; | |
1039 | dest->tx_bytes = stats->tx_bytes; | |
1040 | dest->tx_errors = stats->tx_errors; | |
1041 | dest->rx_packets = stats->rx_packets; | |
1042 | dest->rx_bytes = stats->rx_bytes; | |
1043 | dest->rx_seq_discards = stats->rx_seq_discards; | |
1044 | dest->rx_oos_packets = stats->rx_oos_packets; | |
1045 | dest->rx_errors = stats->rx_errors; | |
1046 | } | |
1047 | ||
1048 | /* Session ioctl helper. | |
1049 | */ | |
1050 | static int pppol2tp_session_ioctl(struct l2tp_session *session, | |
1051 | unsigned int cmd, unsigned long arg) | |
1052 | { | |
1053 | struct ifreq ifr; | |
1054 | int err = 0; | |
1055 | struct sock *sk; | |
1056 | int val = (int) arg; | |
1057 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
1058 | struct l2tp_tunnel *tunnel = session->tunnel; | |
1059 | struct pppol2tp_ioc_stats stats; | |
1060 | ||
1061 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG, | |
1062 | "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n", | |
1063 | session->name, cmd, arg); | |
1064 | ||
1065 | sk = ps->sock; | |
1066 | sock_hold(sk); | |
1067 | ||
1068 | switch (cmd) { | |
1069 | case SIOCGIFMTU: | |
1070 | err = -ENXIO; | |
1071 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1072 | break; | |
1073 | ||
1074 | err = -EFAULT; | |
1075 | if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq))) | |
1076 | break; | |
1077 | ifr.ifr_mtu = session->mtu; | |
1078 | if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq))) | |
1079 | break; | |
1080 | ||
1081 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1082 | "%s: get mtu=%d\n", session->name, session->mtu); | |
1083 | err = 0; | |
1084 | break; | |
1085 | ||
1086 | case SIOCSIFMTU: | |
1087 | err = -ENXIO; | |
1088 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1089 | break; | |
1090 | ||
1091 | err = -EFAULT; | |
1092 | if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq))) | |
1093 | break; | |
1094 | ||
1095 | session->mtu = ifr.ifr_mtu; | |
1096 | ||
1097 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1098 | "%s: set mtu=%d\n", session->name, session->mtu); | |
1099 | err = 0; | |
1100 | break; | |
1101 | ||
1102 | case PPPIOCGMRU: | |
1103 | err = -ENXIO; | |
1104 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1105 | break; | |
1106 | ||
1107 | err = -EFAULT; | |
1108 | if (put_user(session->mru, (int __user *) arg)) | |
1109 | break; | |
1110 | ||
1111 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1112 | "%s: get mru=%d\n", session->name, session->mru); | |
1113 | err = 0; | |
1114 | break; | |
1115 | ||
1116 | case PPPIOCSMRU: | |
1117 | err = -ENXIO; | |
1118 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1119 | break; | |
1120 | ||
1121 | err = -EFAULT; | |
1122 | if (get_user(val, (int __user *) arg)) | |
1123 | break; | |
1124 | ||
1125 | session->mru = val; | |
1126 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1127 | "%s: set mru=%d\n", session->name, session->mru); | |
1128 | err = 0; | |
1129 | break; | |
1130 | ||
1131 | case PPPIOCGFLAGS: | |
1132 | err = -EFAULT; | |
1133 | if (put_user(ps->flags, (int __user *) arg)) | |
1134 | break; | |
1135 | ||
1136 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1137 | "%s: get flags=%d\n", session->name, ps->flags); | |
1138 | err = 0; | |
1139 | break; | |
1140 | ||
1141 | case PPPIOCSFLAGS: | |
1142 | err = -EFAULT; | |
1143 | if (get_user(val, (int __user *) arg)) | |
1144 | break; | |
1145 | ps->flags = val; | |
1146 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1147 | "%s: set flags=%d\n", session->name, ps->flags); | |
1148 | err = 0; | |
1149 | break; | |
1150 | ||
1151 | case PPPIOCGL2TPSTATS: | |
1152 | err = -ENXIO; | |
1153 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1154 | break; | |
1155 | ||
1156 | memset(&stats, 0, sizeof(stats)); | |
1157 | stats.tunnel_id = tunnel->tunnel_id; | |
1158 | stats.session_id = session->session_id; | |
1159 | pppol2tp_copy_stats(&stats, &session->stats); | |
1160 | if (copy_to_user((void __user *) arg, &stats, | |
1161 | sizeof(stats))) | |
1162 | break; | |
1163 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1164 | "%s: get L2TP stats\n", session->name); | |
1165 | err = 0; | |
1166 | break; | |
1167 | ||
1168 | default: | |
1169 | err = -ENOSYS; | |
1170 | break; | |
1171 | } | |
1172 | ||
1173 | sock_put(sk); | |
1174 | ||
1175 | return err; | |
1176 | } | |
1177 | ||
1178 | /* Tunnel ioctl helper. | |
1179 | * | |
1180 | * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data | |
1181 | * specifies a session_id, the session ioctl handler is called. This allows an | |
1182 | * application to retrieve session stats via a tunnel socket. | |
1183 | */ | |
1184 | static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel, | |
1185 | unsigned int cmd, unsigned long arg) | |
1186 | { | |
1187 | int err = 0; | |
1188 | struct sock *sk; | |
1189 | struct pppol2tp_ioc_stats stats; | |
1190 | ||
1191 | PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG, | |
1192 | "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n", | |
1193 | tunnel->name, cmd, arg); | |
1194 | ||
1195 | sk = tunnel->sock; | |
1196 | sock_hold(sk); | |
1197 | ||
1198 | switch (cmd) { | |
1199 | case PPPIOCGL2TPSTATS: | |
1200 | err = -ENXIO; | |
1201 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1202 | break; | |
1203 | ||
1204 | if (copy_from_user(&stats, (void __user *) arg, | |
1205 | sizeof(stats))) { | |
1206 | err = -EFAULT; | |
1207 | break; | |
1208 | } | |
1209 | if (stats.session_id != 0) { | |
1210 | /* resend to session ioctl handler */ | |
1211 | struct l2tp_session *session = | |
f7faffa3 | 1212 | l2tp_session_find(sock_net(sk), tunnel, stats.session_id); |
fd558d18 JC |
1213 | if (session != NULL) |
1214 | err = pppol2tp_session_ioctl(session, cmd, arg); | |
1215 | else | |
1216 | err = -EBADR; | |
1217 | break; | |
1218 | } | |
1219 | #ifdef CONFIG_XFRM | |
1220 | stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0; | |
1221 | #endif | |
1222 | pppol2tp_copy_stats(&stats, &tunnel->stats); | |
1223 | if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) { | |
1224 | err = -EFAULT; | |
1225 | break; | |
1226 | } | |
1227 | PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1228 | "%s: get L2TP stats\n", tunnel->name); | |
1229 | err = 0; | |
1230 | break; | |
1231 | ||
1232 | default: | |
1233 | err = -ENOSYS; | |
1234 | break; | |
1235 | } | |
1236 | ||
1237 | sock_put(sk); | |
1238 | ||
1239 | return err; | |
1240 | } | |
1241 | ||
1242 | /* Main ioctl() handler. | |
1243 | * Dispatch to tunnel or session helpers depending on the socket. | |
1244 | */ | |
1245 | static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd, | |
1246 | unsigned long arg) | |
1247 | { | |
1248 | struct sock *sk = sock->sk; | |
1249 | struct l2tp_session *session; | |
1250 | struct l2tp_tunnel *tunnel; | |
1251 | struct pppol2tp_session *ps; | |
1252 | int err; | |
1253 | ||
1254 | if (!sk) | |
1255 | return 0; | |
1256 | ||
1257 | err = -EBADF; | |
1258 | if (sock_flag(sk, SOCK_DEAD) != 0) | |
1259 | goto end; | |
1260 | ||
1261 | err = -ENOTCONN; | |
1262 | if ((sk->sk_user_data == NULL) || | |
1263 | (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)))) | |
1264 | goto end; | |
1265 | ||
1266 | /* Get session context from the socket */ | |
1267 | err = -EBADF; | |
1268 | session = pppol2tp_sock_to_session(sk); | |
1269 | if (session == NULL) | |
1270 | goto end; | |
1271 | ||
1272 | /* Special case: if session's session_id is zero, treat ioctl as a | |
1273 | * tunnel ioctl | |
1274 | */ | |
1275 | ps = l2tp_session_priv(session); | |
1276 | if ((session->session_id == 0) && | |
1277 | (session->peer_session_id == 0)) { | |
1278 | err = -EBADF; | |
1279 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
1280 | if (tunnel == NULL) | |
1281 | goto end_put_sess; | |
1282 | ||
1283 | err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg); | |
1284 | sock_put(ps->tunnel_sock); | |
1285 | goto end_put_sess; | |
1286 | } | |
1287 | ||
1288 | err = pppol2tp_session_ioctl(session, cmd, arg); | |
1289 | ||
1290 | end_put_sess: | |
1291 | sock_put(sk); | |
1292 | end: | |
1293 | return err; | |
1294 | } | |
1295 | ||
1296 | /***************************************************************************** | |
1297 | * setsockopt() / getsockopt() support. | |
1298 | * | |
1299 | * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP | |
1300 | * sockets. In order to control kernel tunnel features, we allow userspace to | |
1301 | * create a special "tunnel" PPPoX socket which is used for control only. | |
1302 | * Tunnel PPPoX sockets have session_id == 0 and simply allow the user | |
1303 | * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls. | |
1304 | *****************************************************************************/ | |
1305 | ||
1306 | /* Tunnel setsockopt() helper. | |
1307 | */ | |
1308 | static int pppol2tp_tunnel_setsockopt(struct sock *sk, | |
1309 | struct l2tp_tunnel *tunnel, | |
1310 | int optname, int val) | |
1311 | { | |
1312 | int err = 0; | |
1313 | ||
1314 | switch (optname) { | |
1315 | case PPPOL2TP_SO_DEBUG: | |
1316 | tunnel->debug = val; | |
1317 | PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1318 | "%s: set debug=%x\n", tunnel->name, tunnel->debug); | |
1319 | break; | |
1320 | ||
1321 | default: | |
1322 | err = -ENOPROTOOPT; | |
1323 | break; | |
1324 | } | |
1325 | ||
1326 | return err; | |
1327 | } | |
1328 | ||
1329 | /* Session setsockopt helper. | |
1330 | */ | |
1331 | static int pppol2tp_session_setsockopt(struct sock *sk, | |
1332 | struct l2tp_session *session, | |
1333 | int optname, int val) | |
1334 | { | |
1335 | int err = 0; | |
1336 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
1337 | ||
1338 | switch (optname) { | |
1339 | case PPPOL2TP_SO_RECVSEQ: | |
1340 | if ((val != 0) && (val != 1)) { | |
1341 | err = -EINVAL; | |
1342 | break; | |
1343 | } | |
1344 | session->recv_seq = val ? -1 : 0; | |
1345 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1346 | "%s: set recv_seq=%d\n", session->name, session->recv_seq); | |
1347 | break; | |
1348 | ||
1349 | case PPPOL2TP_SO_SENDSEQ: | |
1350 | if ((val != 0) && (val != 1)) { | |
1351 | err = -EINVAL; | |
1352 | break; | |
1353 | } | |
1354 | session->send_seq = val ? -1 : 0; | |
1355 | { | |
1356 | struct sock *ssk = ps->sock; | |
1357 | struct pppox_sock *po = pppox_sk(ssk); | |
1358 | po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ : | |
1359 | PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
1360 | } | |
1361 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1362 | "%s: set send_seq=%d\n", session->name, session->send_seq); | |
1363 | break; | |
1364 | ||
1365 | case PPPOL2TP_SO_LNSMODE: | |
1366 | if ((val != 0) && (val != 1)) { | |
1367 | err = -EINVAL; | |
1368 | break; | |
1369 | } | |
1370 | session->lns_mode = val ? -1 : 0; | |
1371 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1372 | "%s: set lns_mode=%d\n", session->name, session->lns_mode); | |
1373 | break; | |
1374 | ||
1375 | case PPPOL2TP_SO_DEBUG: | |
1376 | session->debug = val; | |
1377 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1378 | "%s: set debug=%x\n", session->name, session->debug); | |
1379 | break; | |
1380 | ||
1381 | case PPPOL2TP_SO_REORDERTO: | |
1382 | session->reorder_timeout = msecs_to_jiffies(val); | |
1383 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1384 | "%s: set reorder_timeout=%d\n", session->name, session->reorder_timeout); | |
1385 | break; | |
1386 | ||
1387 | default: | |
1388 | err = -ENOPROTOOPT; | |
1389 | break; | |
1390 | } | |
1391 | ||
1392 | return err; | |
1393 | } | |
1394 | ||
1395 | /* Main setsockopt() entry point. | |
1396 | * Does API checks, then calls either the tunnel or session setsockopt | |
1397 | * handler, according to whether the PPPoL2TP socket is a for a regular | |
1398 | * session or the special tunnel type. | |
1399 | */ | |
1400 | static int pppol2tp_setsockopt(struct socket *sock, int level, int optname, | |
1401 | char __user *optval, unsigned int optlen) | |
1402 | { | |
1403 | struct sock *sk = sock->sk; | |
1404 | struct l2tp_session *session; | |
1405 | struct l2tp_tunnel *tunnel; | |
1406 | struct pppol2tp_session *ps; | |
1407 | int val; | |
1408 | int err; | |
1409 | ||
1410 | if (level != SOL_PPPOL2TP) | |
1411 | return udp_prot.setsockopt(sk, level, optname, optval, optlen); | |
1412 | ||
1413 | if (optlen < sizeof(int)) | |
1414 | return -EINVAL; | |
1415 | ||
1416 | if (get_user(val, (int __user *)optval)) | |
1417 | return -EFAULT; | |
1418 | ||
1419 | err = -ENOTCONN; | |
1420 | if (sk->sk_user_data == NULL) | |
1421 | goto end; | |
1422 | ||
1423 | /* Get session context from the socket */ | |
1424 | err = -EBADF; | |
1425 | session = pppol2tp_sock_to_session(sk); | |
1426 | if (session == NULL) | |
1427 | goto end; | |
1428 | ||
1429 | /* Special case: if session_id == 0x0000, treat as operation on tunnel | |
1430 | */ | |
1431 | ps = l2tp_session_priv(session); | |
1432 | if ((session->session_id == 0) && | |
1433 | (session->peer_session_id == 0)) { | |
1434 | err = -EBADF; | |
1435 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
1436 | if (tunnel == NULL) | |
1437 | goto end_put_sess; | |
1438 | ||
1439 | err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val); | |
1440 | sock_put(ps->tunnel_sock); | |
1441 | } else | |
1442 | err = pppol2tp_session_setsockopt(sk, session, optname, val); | |
1443 | ||
1444 | err = 0; | |
1445 | ||
1446 | end_put_sess: | |
1447 | sock_put(sk); | |
1448 | end: | |
1449 | return err; | |
1450 | } | |
1451 | ||
1452 | /* Tunnel getsockopt helper. Called with sock locked. | |
1453 | */ | |
1454 | static int pppol2tp_tunnel_getsockopt(struct sock *sk, | |
1455 | struct l2tp_tunnel *tunnel, | |
1456 | int optname, int *val) | |
1457 | { | |
1458 | int err = 0; | |
1459 | ||
1460 | switch (optname) { | |
1461 | case PPPOL2TP_SO_DEBUG: | |
1462 | *val = tunnel->debug; | |
1463 | PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1464 | "%s: get debug=%x\n", tunnel->name, tunnel->debug); | |
1465 | break; | |
1466 | ||
1467 | default: | |
1468 | err = -ENOPROTOOPT; | |
1469 | break; | |
1470 | } | |
1471 | ||
1472 | return err; | |
1473 | } | |
1474 | ||
1475 | /* Session getsockopt helper. Called with sock locked. | |
1476 | */ | |
1477 | static int pppol2tp_session_getsockopt(struct sock *sk, | |
1478 | struct l2tp_session *session, | |
1479 | int optname, int *val) | |
1480 | { | |
1481 | int err = 0; | |
1482 | ||
1483 | switch (optname) { | |
1484 | case PPPOL2TP_SO_RECVSEQ: | |
1485 | *val = session->recv_seq; | |
1486 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1487 | "%s: get recv_seq=%d\n", session->name, *val); | |
1488 | break; | |
1489 | ||
1490 | case PPPOL2TP_SO_SENDSEQ: | |
1491 | *val = session->send_seq; | |
1492 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1493 | "%s: get send_seq=%d\n", session->name, *val); | |
1494 | break; | |
1495 | ||
1496 | case PPPOL2TP_SO_LNSMODE: | |
1497 | *val = session->lns_mode; | |
1498 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1499 | "%s: get lns_mode=%d\n", session->name, *val); | |
1500 | break; | |
1501 | ||
1502 | case PPPOL2TP_SO_DEBUG: | |
1503 | *val = session->debug; | |
1504 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1505 | "%s: get debug=%d\n", session->name, *val); | |
1506 | break; | |
1507 | ||
1508 | case PPPOL2TP_SO_REORDERTO: | |
1509 | *val = (int) jiffies_to_msecs(session->reorder_timeout); | |
1510 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1511 | "%s: get reorder_timeout=%d\n", session->name, *val); | |
1512 | break; | |
1513 | ||
1514 | default: | |
1515 | err = -ENOPROTOOPT; | |
1516 | } | |
1517 | ||
1518 | return err; | |
1519 | } | |
1520 | ||
1521 | /* Main getsockopt() entry point. | |
1522 | * Does API checks, then calls either the tunnel or session getsockopt | |
1523 | * handler, according to whether the PPPoX socket is a for a regular session | |
1524 | * or the special tunnel type. | |
1525 | */ | |
1526 | static int pppol2tp_getsockopt(struct socket *sock, int level, | |
1527 | int optname, char __user *optval, int __user *optlen) | |
1528 | { | |
1529 | struct sock *sk = sock->sk; | |
1530 | struct l2tp_session *session; | |
1531 | struct l2tp_tunnel *tunnel; | |
1532 | int val, len; | |
1533 | int err; | |
1534 | struct pppol2tp_session *ps; | |
1535 | ||
1536 | if (level != SOL_PPPOL2TP) | |
1537 | return udp_prot.getsockopt(sk, level, optname, optval, optlen); | |
1538 | ||
1539 | if (get_user(len, (int __user *) optlen)) | |
1540 | return -EFAULT; | |
1541 | ||
1542 | len = min_t(unsigned int, len, sizeof(int)); | |
1543 | ||
1544 | if (len < 0) | |
1545 | return -EINVAL; | |
1546 | ||
1547 | err = -ENOTCONN; | |
1548 | if (sk->sk_user_data == NULL) | |
1549 | goto end; | |
1550 | ||
1551 | /* Get the session context */ | |
1552 | err = -EBADF; | |
1553 | session = pppol2tp_sock_to_session(sk); | |
1554 | if (session == NULL) | |
1555 | goto end; | |
1556 | ||
1557 | /* Special case: if session_id == 0x0000, treat as operation on tunnel */ | |
1558 | ps = l2tp_session_priv(session); | |
1559 | if ((session->session_id == 0) && | |
1560 | (session->peer_session_id == 0)) { | |
1561 | err = -EBADF; | |
1562 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
1563 | if (tunnel == NULL) | |
1564 | goto end_put_sess; | |
1565 | ||
1566 | err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val); | |
1567 | sock_put(ps->tunnel_sock); | |
1568 | } else | |
1569 | err = pppol2tp_session_getsockopt(sk, session, optname, &val); | |
1570 | ||
1571 | err = -EFAULT; | |
1572 | if (put_user(len, (int __user *) optlen)) | |
1573 | goto end_put_sess; | |
1574 | ||
1575 | if (copy_to_user((void __user *) optval, &val, len)) | |
1576 | goto end_put_sess; | |
1577 | ||
1578 | err = 0; | |
1579 | ||
1580 | end_put_sess: | |
1581 | sock_put(sk); | |
1582 | end: | |
1583 | return err; | |
1584 | } | |
1585 | ||
1586 | /***************************************************************************** | |
1587 | * /proc filesystem for debug | |
f7faffa3 JC |
1588 | * Since the original pppol2tp driver provided /proc/net/pppol2tp for |
1589 | * L2TPv2, we dump only L2TPv2 tunnels and sessions here. | |
fd558d18 JC |
1590 | *****************************************************************************/ |
1591 | ||
1592 | static unsigned int pppol2tp_net_id; | |
1593 | ||
1594 | #ifdef CONFIG_PROC_FS | |
1595 | ||
1596 | struct pppol2tp_seq_data { | |
1597 | struct seq_net_private p; | |
1598 | int tunnel_idx; /* current tunnel */ | |
1599 | int session_idx; /* index of session within current tunnel */ | |
1600 | struct l2tp_tunnel *tunnel; | |
1601 | struct l2tp_session *session; /* NULL means get next tunnel */ | |
1602 | }; | |
1603 | ||
1604 | static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd) | |
1605 | { | |
f7faffa3 JC |
1606 | for (;;) { |
1607 | pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx); | |
1608 | pd->tunnel_idx++; | |
1609 | ||
1610 | if (pd->tunnel == NULL) | |
1611 | break; | |
1612 | ||
1613 | /* Ignore L2TPv3 tunnels */ | |
1614 | if (pd->tunnel->version < 3) | |
1615 | break; | |
1616 | } | |
fd558d18 JC |
1617 | } |
1618 | ||
1619 | static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd) | |
1620 | { | |
1621 | pd->session = l2tp_session_find_nth(pd->tunnel, pd->session_idx); | |
1622 | pd->session_idx++; | |
f7faffa3 | 1623 | |
fd558d18 JC |
1624 | if (pd->session == NULL) { |
1625 | pd->session_idx = 0; | |
1626 | pppol2tp_next_tunnel(net, pd); | |
1627 | } | |
1628 | } | |
1629 | ||
1630 | static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs) | |
1631 | { | |
1632 | struct pppol2tp_seq_data *pd = SEQ_START_TOKEN; | |
1633 | loff_t pos = *offs; | |
1634 | struct net *net; | |
1635 | ||
1636 | if (!pos) | |
1637 | goto out; | |
1638 | ||
1639 | BUG_ON(m->private == NULL); | |
1640 | pd = m->private; | |
1641 | net = seq_file_net(m); | |
1642 | ||
1643 | if (pd->tunnel == NULL) | |
1644 | pppol2tp_next_tunnel(net, pd); | |
1645 | else | |
1646 | pppol2tp_next_session(net, pd); | |
1647 | ||
1648 | /* NULL tunnel and session indicates end of list */ | |
1649 | if ((pd->tunnel == NULL) && (pd->session == NULL)) | |
1650 | pd = NULL; | |
1651 | ||
1652 | out: | |
1653 | return pd; | |
1654 | } | |
1655 | ||
1656 | static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
1657 | { | |
1658 | (*pos)++; | |
1659 | return NULL; | |
1660 | } | |
1661 | ||
1662 | static void pppol2tp_seq_stop(struct seq_file *p, void *v) | |
1663 | { | |
1664 | /* nothing to do */ | |
1665 | } | |
1666 | ||
1667 | static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v) | |
1668 | { | |
1669 | struct l2tp_tunnel *tunnel = v; | |
1670 | ||
1671 | seq_printf(m, "\nTUNNEL '%s', %c %d\n", | |
1672 | tunnel->name, | |
1673 | (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N', | |
1674 | atomic_read(&tunnel->ref_count) - 1); | |
1675 | seq_printf(m, " %08x %llu/%llu/%llu %llu/%llu/%llu\n", | |
1676 | tunnel->debug, | |
1677 | (unsigned long long)tunnel->stats.tx_packets, | |
1678 | (unsigned long long)tunnel->stats.tx_bytes, | |
1679 | (unsigned long long)tunnel->stats.tx_errors, | |
1680 | (unsigned long long)tunnel->stats.rx_packets, | |
1681 | (unsigned long long)tunnel->stats.rx_bytes, | |
1682 | (unsigned long long)tunnel->stats.rx_errors); | |
1683 | } | |
1684 | ||
1685 | static void pppol2tp_seq_session_show(struct seq_file *m, void *v) | |
1686 | { | |
1687 | struct l2tp_session *session = v; | |
1688 | struct l2tp_tunnel *tunnel = session->tunnel; | |
1689 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
9345471b | 1690 | struct pppox_sock *po = pppox_sk(ps->sock); |
fd558d18 JC |
1691 | u32 ip = 0; |
1692 | u16 port = 0; | |
1693 | ||
1694 | if (tunnel->sock) { | |
1695 | struct inet_sock *inet = inet_sk(tunnel->sock); | |
1696 | ip = ntohl(inet->inet_saddr); | |
1697 | port = ntohs(inet->inet_sport); | |
1698 | } | |
1699 | ||
1700 | seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> " | |
1701 | "%04X/%04X %d %c\n", | |
1702 | session->name, ip, port, | |
1703 | tunnel->tunnel_id, | |
1704 | session->session_id, | |
1705 | tunnel->peer_tunnel_id, | |
1706 | session->peer_session_id, | |
1707 | ps->sock->sk_state, | |
1708 | (session == ps->sock->sk_user_data) ? | |
1709 | 'Y' : 'N'); | |
1710 | seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n", | |
1711 | session->mtu, session->mru, | |
1712 | session->recv_seq ? 'R' : '-', | |
1713 | session->send_seq ? 'S' : '-', | |
1714 | session->lns_mode ? "LNS" : "LAC", | |
1715 | session->debug, | |
1716 | jiffies_to_msecs(session->reorder_timeout)); | |
1717 | seq_printf(m, " %hu/%hu %llu/%llu/%llu %llu/%llu/%llu\n", | |
1718 | session->nr, session->ns, | |
1719 | (unsigned long long)session->stats.tx_packets, | |
1720 | (unsigned long long)session->stats.tx_bytes, | |
1721 | (unsigned long long)session->stats.tx_errors, | |
1722 | (unsigned long long)session->stats.rx_packets, | |
1723 | (unsigned long long)session->stats.rx_bytes, | |
1724 | (unsigned long long)session->stats.rx_errors); | |
9345471b JC |
1725 | |
1726 | if (po) | |
1727 | seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan)); | |
fd558d18 JC |
1728 | } |
1729 | ||
1730 | static int pppol2tp_seq_show(struct seq_file *m, void *v) | |
1731 | { | |
1732 | struct pppol2tp_seq_data *pd = v; | |
1733 | ||
1734 | /* display header on line 1 */ | |
1735 | if (v == SEQ_START_TOKEN) { | |
1736 | seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n"); | |
1737 | seq_puts(m, "TUNNEL name, user-data-ok session-count\n"); | |
1738 | seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
1739 | seq_puts(m, " SESSION name, addr/port src-tid/sid " | |
1740 | "dest-tid/sid state user-data-ok\n"); | |
1741 | seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n"); | |
1742 | seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
1743 | goto out; | |
1744 | } | |
1745 | ||
1746 | /* Show the tunnel or session context. | |
1747 | */ | |
1748 | if (pd->session == NULL) | |
1749 | pppol2tp_seq_tunnel_show(m, pd->tunnel); | |
1750 | else | |
1751 | pppol2tp_seq_session_show(m, pd->session); | |
1752 | ||
1753 | out: | |
1754 | return 0; | |
1755 | } | |
1756 | ||
1757 | static const struct seq_operations pppol2tp_seq_ops = { | |
1758 | .start = pppol2tp_seq_start, | |
1759 | .next = pppol2tp_seq_next, | |
1760 | .stop = pppol2tp_seq_stop, | |
1761 | .show = pppol2tp_seq_show, | |
1762 | }; | |
1763 | ||
1764 | /* Called when our /proc file is opened. We allocate data for use when | |
1765 | * iterating our tunnel / session contexts and store it in the private | |
1766 | * data of the seq_file. | |
1767 | */ | |
1768 | static int pppol2tp_proc_open(struct inode *inode, struct file *file) | |
1769 | { | |
1770 | return seq_open_net(inode, file, &pppol2tp_seq_ops, | |
1771 | sizeof(struct pppol2tp_seq_data)); | |
1772 | } | |
1773 | ||
1774 | static const struct file_operations pppol2tp_proc_fops = { | |
1775 | .owner = THIS_MODULE, | |
1776 | .open = pppol2tp_proc_open, | |
1777 | .read = seq_read, | |
1778 | .llseek = seq_lseek, | |
1779 | .release = seq_release_net, | |
1780 | }; | |
1781 | ||
1782 | #endif /* CONFIG_PROC_FS */ | |
1783 | ||
1784 | /***************************************************************************** | |
1785 | * Network namespace | |
1786 | *****************************************************************************/ | |
1787 | ||
1788 | static __net_init int pppol2tp_init_net(struct net *net) | |
1789 | { | |
1790 | struct proc_dir_entry *pde; | |
1791 | int err = 0; | |
1792 | ||
1793 | pde = proc_net_fops_create(net, "pppol2tp", S_IRUGO, &pppol2tp_proc_fops); | |
1794 | if (!pde) { | |
1795 | err = -ENOMEM; | |
1796 | goto out; | |
1797 | } | |
1798 | ||
1799 | out: | |
1800 | return err; | |
1801 | } | |
1802 | ||
1803 | static __net_exit void pppol2tp_exit_net(struct net *net) | |
1804 | { | |
1805 | proc_net_remove(net, "pppol2tp"); | |
1806 | } | |
1807 | ||
1808 | static struct pernet_operations pppol2tp_net_ops = { | |
1809 | .init = pppol2tp_init_net, | |
1810 | .exit = pppol2tp_exit_net, | |
1811 | .id = &pppol2tp_net_id, | |
1812 | }; | |
1813 | ||
1814 | /***************************************************************************** | |
1815 | * Init and cleanup | |
1816 | *****************************************************************************/ | |
1817 | ||
1818 | static const struct proto_ops pppol2tp_ops = { | |
1819 | .family = AF_PPPOX, | |
1820 | .owner = THIS_MODULE, | |
1821 | .release = pppol2tp_release, | |
1822 | .bind = sock_no_bind, | |
1823 | .connect = pppol2tp_connect, | |
1824 | .socketpair = sock_no_socketpair, | |
1825 | .accept = sock_no_accept, | |
1826 | .getname = pppol2tp_getname, | |
1827 | .poll = datagram_poll, | |
1828 | .listen = sock_no_listen, | |
1829 | .shutdown = sock_no_shutdown, | |
1830 | .setsockopt = pppol2tp_setsockopt, | |
1831 | .getsockopt = pppol2tp_getsockopt, | |
1832 | .sendmsg = pppol2tp_sendmsg, | |
1833 | .recvmsg = pppol2tp_recvmsg, | |
1834 | .mmap = sock_no_mmap, | |
1835 | .ioctl = pppox_ioctl, | |
1836 | }; | |
1837 | ||
756e64a0 | 1838 | static const struct pppox_proto pppol2tp_proto = { |
fd558d18 JC |
1839 | .create = pppol2tp_create, |
1840 | .ioctl = pppol2tp_ioctl | |
1841 | }; | |
1842 | ||
309795f4 JC |
1843 | #ifdef CONFIG_L2TP_V3 |
1844 | ||
1845 | static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = { | |
1846 | .session_create = pppol2tp_session_create, | |
1847 | .session_delete = pppol2tp_session_delete, | |
1848 | }; | |
1849 | ||
1850 | #endif /* CONFIG_L2TP_V3 */ | |
1851 | ||
fd558d18 JC |
1852 | static int __init pppol2tp_init(void) |
1853 | { | |
1854 | int err; | |
1855 | ||
1856 | err = register_pernet_device(&pppol2tp_net_ops); | |
1857 | if (err) | |
1858 | goto out; | |
1859 | ||
1860 | err = proto_register(&pppol2tp_sk_proto, 0); | |
1861 | if (err) | |
1862 | goto out_unregister_pppol2tp_pernet; | |
1863 | ||
1864 | err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto); | |
1865 | if (err) | |
1866 | goto out_unregister_pppol2tp_proto; | |
1867 | ||
309795f4 JC |
1868 | #ifdef CONFIG_L2TP_V3 |
1869 | err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops); | |
1870 | if (err) | |
1871 | goto out_unregister_pppox; | |
1872 | #endif | |
1873 | ||
fd558d18 JC |
1874 | printk(KERN_INFO "PPPoL2TP kernel driver, %s\n", |
1875 | PPPOL2TP_DRV_VERSION); | |
1876 | ||
1877 | out: | |
1878 | return err; | |
309795f4 JC |
1879 | |
1880 | #ifdef CONFIG_L2TP_V3 | |
1881 | out_unregister_pppox: | |
1882 | unregister_pppox_proto(PX_PROTO_OL2TP); | |
1883 | #endif | |
fd558d18 JC |
1884 | out_unregister_pppol2tp_proto: |
1885 | proto_unregister(&pppol2tp_sk_proto); | |
1886 | out_unregister_pppol2tp_pernet: | |
1887 | unregister_pernet_device(&pppol2tp_net_ops); | |
1888 | goto out; | |
1889 | } | |
1890 | ||
1891 | static void __exit pppol2tp_exit(void) | |
1892 | { | |
309795f4 JC |
1893 | #ifdef CONFIG_L2TP_V3 |
1894 | l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP); | |
1895 | #endif | |
fd558d18 JC |
1896 | unregister_pppox_proto(PX_PROTO_OL2TP); |
1897 | proto_unregister(&pppol2tp_sk_proto); | |
1898 | unregister_pernet_device(&pppol2tp_net_ops); | |
1899 | } | |
1900 | ||
1901 | module_init(pppol2tp_init); | |
1902 | module_exit(pppol2tp_exit); | |
1903 | ||
1904 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); | |
1905 | MODULE_DESCRIPTION("PPP over L2TP over UDP"); | |
1906 | MODULE_LICENSE("GPL"); | |
1907 | MODULE_VERSION(PPPOL2TP_DRV_VERSION); | |
9395a09d | 1908 | MODULE_ALIAS("pppox-proto-" __stringify(PX_PROTO_OL2TP)); |