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fd558d18 JC |
1 | /***************************************************************************** |
2 | * Linux PPP over L2TP (PPPoX/PPPoL2TP) Sockets | |
3 | * | |
4 | * PPPoX --- Generic PPP encapsulation socket family | |
5 | * PPPoL2TP --- PPP over L2TP (RFC 2661) | |
6 | * | |
7 | * Version: 2.0.0 | |
8 | * | |
9 | * Authors: James Chapman (jchapman@katalix.com) | |
10 | * | |
11 | * Based on original work by Martijn van Oosterhout <kleptog@svana.org> | |
12 | * | |
13 | * License: | |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | * | |
19 | */ | |
20 | ||
21 | /* This driver handles only L2TP data frames; control frames are handled by a | |
22 | * userspace application. | |
23 | * | |
24 | * To send data in an L2TP session, userspace opens a PPPoL2TP socket and | |
25 | * attaches it to a bound UDP socket with local tunnel_id / session_id and | |
26 | * peer tunnel_id / session_id set. Data can then be sent or received using | |
27 | * regular socket sendmsg() / recvmsg() calls. Kernel parameters of the socket | |
28 | * can be read or modified using ioctl() or [gs]etsockopt() calls. | |
29 | * | |
30 | * When a PPPoL2TP socket is connected with local and peer session_id values | |
31 | * zero, the socket is treated as a special tunnel management socket. | |
32 | * | |
33 | * Here's example userspace code to create a socket for sending/receiving data | |
34 | * over an L2TP session:- | |
35 | * | |
36 | * struct sockaddr_pppol2tp sax; | |
37 | * int fd; | |
38 | * int session_fd; | |
39 | * | |
40 | * fd = socket(AF_PPPOX, SOCK_DGRAM, PX_PROTO_OL2TP); | |
41 | * | |
42 | * sax.sa_family = AF_PPPOX; | |
43 | * sax.sa_protocol = PX_PROTO_OL2TP; | |
44 | * sax.pppol2tp.fd = tunnel_fd; // bound UDP socket | |
45 | * sax.pppol2tp.addr.sin_addr.s_addr = addr->sin_addr.s_addr; | |
46 | * sax.pppol2tp.addr.sin_port = addr->sin_port; | |
47 | * sax.pppol2tp.addr.sin_family = AF_INET; | |
48 | * sax.pppol2tp.s_tunnel = tunnel_id; | |
49 | * sax.pppol2tp.s_session = session_id; | |
50 | * sax.pppol2tp.d_tunnel = peer_tunnel_id; | |
51 | * sax.pppol2tp.d_session = peer_session_id; | |
52 | * | |
53 | * session_fd = connect(fd, (struct sockaddr *)&sax, sizeof(sax)); | |
54 | * | |
55 | * A pppd plugin that allows PPP traffic to be carried over L2TP using | |
56 | * this driver is available from the OpenL2TP project at | |
57 | * http://openl2tp.sourceforge.net. | |
58 | */ | |
59 | ||
a4ca44fa JP |
60 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
61 | ||
fd558d18 JC |
62 | #include <linux/module.h> |
63 | #include <linux/string.h> | |
64 | #include <linux/list.h> | |
65 | #include <linux/uaccess.h> | |
66 | ||
67 | #include <linux/kernel.h> | |
68 | #include <linux/spinlock.h> | |
69 | #include <linux/kthread.h> | |
70 | #include <linux/sched.h> | |
71 | #include <linux/slab.h> | |
72 | #include <linux/errno.h> | |
73 | #include <linux/jiffies.h> | |
74 | ||
75 | #include <linux/netdevice.h> | |
76 | #include <linux/net.h> | |
77 | #include <linux/inetdevice.h> | |
78 | #include <linux/skbuff.h> | |
79 | #include <linux/init.h> | |
80 | #include <linux/ip.h> | |
81 | #include <linux/udp.h> | |
82 | #include <linux/if_pppox.h> | |
83 | #include <linux/if_pppol2tp.h> | |
84 | #include <net/sock.h> | |
85 | #include <linux/ppp_channel.h> | |
86 | #include <linux/ppp_defs.h> | |
4b32da2b | 87 | #include <linux/ppp-ioctl.h> |
fd558d18 JC |
88 | #include <linux/file.h> |
89 | #include <linux/hash.h> | |
90 | #include <linux/sort.h> | |
91 | #include <linux/proc_fs.h> | |
309795f4 | 92 | #include <linux/l2tp.h> |
fd558d18 JC |
93 | #include <linux/nsproxy.h> |
94 | #include <net/net_namespace.h> | |
95 | #include <net/netns/generic.h> | |
96 | #include <net/dst.h> | |
97 | #include <net/ip.h> | |
98 | #include <net/udp.h> | |
99 | #include <net/xfrm.h> | |
100 | ||
101 | #include <asm/byteorder.h> | |
60063497 | 102 | #include <linux/atomic.h> |
fd558d18 JC |
103 | |
104 | #include "l2tp_core.h" | |
105 | ||
106 | #define PPPOL2TP_DRV_VERSION "V2.0" | |
107 | ||
108 | /* Space for UDP, L2TP and PPP headers */ | |
109 | #define PPPOL2TP_HEADER_OVERHEAD 40 | |
110 | ||
fd558d18 JC |
111 | /* Number of bytes to build transmit L2TP headers. |
112 | * Unfortunately the size is different depending on whether sequence numbers | |
113 | * are enabled. | |
114 | */ | |
115 | #define PPPOL2TP_L2TP_HDR_SIZE_SEQ 10 | |
116 | #define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ 6 | |
117 | ||
118 | /* Private data of each session. This data lives at the end of struct | |
119 | * l2tp_session, referenced via session->priv[]. | |
120 | */ | |
121 | struct pppol2tp_session { | |
122 | int owner; /* pid that opened the socket */ | |
123 | ||
124 | struct sock *sock; /* Pointer to the session | |
125 | * PPPoX socket */ | |
126 | struct sock *tunnel_sock; /* Pointer to the tunnel UDP | |
127 | * socket */ | |
128 | int flags; /* accessed by PPPIOCGFLAGS. | |
129 | * Unused. */ | |
130 | }; | |
131 | ||
132 | static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb); | |
133 | ||
d7100da0 | 134 | static const struct ppp_channel_ops pppol2tp_chan_ops = { |
135 | .start_xmit = pppol2tp_xmit, | |
136 | }; | |
137 | ||
fd558d18 JC |
138 | static const struct proto_ops pppol2tp_ops; |
139 | ||
140 | /* Helpers to obtain tunnel/session contexts from sockets. | |
141 | */ | |
142 | static inline struct l2tp_session *pppol2tp_sock_to_session(struct sock *sk) | |
143 | { | |
144 | struct l2tp_session *session; | |
145 | ||
146 | if (sk == NULL) | |
147 | return NULL; | |
148 | ||
149 | sock_hold(sk); | |
150 | session = (struct l2tp_session *)(sk->sk_user_data); | |
151 | if (session == NULL) { | |
152 | sock_put(sk); | |
153 | goto out; | |
154 | } | |
155 | ||
156 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
157 | ||
158 | out: | |
159 | return session; | |
160 | } | |
161 | ||
162 | /***************************************************************************** | |
163 | * Receive data handling | |
164 | *****************************************************************************/ | |
165 | ||
166 | static int pppol2tp_recv_payload_hook(struct sk_buff *skb) | |
167 | { | |
168 | /* Skip PPP header, if present. In testing, Microsoft L2TP clients | |
169 | * don't send the PPP header (PPP header compression enabled), but | |
170 | * other clients can include the header. So we cope with both cases | |
171 | * here. The PPP header is always FF03 when using L2TP. | |
172 | * | |
173 | * Note that skb->data[] isn't dereferenced from a u16 ptr here since | |
174 | * the field may be unaligned. | |
175 | */ | |
176 | if (!pskb_may_pull(skb, 2)) | |
177 | return 1; | |
178 | ||
179 | if ((skb->data[0] == 0xff) && (skb->data[1] == 0x03)) | |
180 | skb_pull(skb, 2); | |
181 | ||
182 | return 0; | |
183 | } | |
184 | ||
185 | /* Receive message. This is the recvmsg for the PPPoL2TP socket. | |
186 | */ | |
187 | static int pppol2tp_recvmsg(struct kiocb *iocb, struct socket *sock, | |
188 | struct msghdr *msg, size_t len, | |
189 | int flags) | |
190 | { | |
191 | int err; | |
192 | struct sk_buff *skb; | |
193 | struct sock *sk = sock->sk; | |
194 | ||
195 | err = -EIO; | |
196 | if (sk->sk_state & PPPOX_BOUND) | |
197 | goto end; | |
198 | ||
199 | msg->msg_namelen = 0; | |
200 | ||
201 | err = 0; | |
202 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
203 | flags & MSG_DONTWAIT, &err); | |
204 | if (!skb) | |
205 | goto end; | |
206 | ||
207 | if (len > skb->len) | |
208 | len = skb->len; | |
209 | else if (len < skb->len) | |
210 | msg->msg_flags |= MSG_TRUNC; | |
211 | ||
212 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len); | |
213 | if (likely(err == 0)) | |
214 | err = len; | |
215 | ||
216 | kfree_skb(skb); | |
217 | end: | |
218 | return err; | |
219 | } | |
220 | ||
221 | static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len) | |
222 | { | |
223 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
224 | struct sock *sk = NULL; | |
225 | ||
226 | /* If the socket is bound, send it in to PPP's input queue. Otherwise | |
227 | * queue it on the session socket. | |
228 | */ | |
229 | sk = ps->sock; | |
230 | if (sk == NULL) | |
231 | goto no_sock; | |
232 | ||
233 | if (sk->sk_state & PPPOX_BOUND) { | |
234 | struct pppox_sock *po; | |
a4ca44fa JP |
235 | l2tp_dbg(session, PPPOL2TP_MSG_DATA, |
236 | "%s: recv %d byte data frame, passing to ppp\n", | |
237 | session->name, data_len); | |
fd558d18 JC |
238 | |
239 | /* We need to forget all info related to the L2TP packet | |
240 | * gathered in the skb as we are going to reuse the same | |
241 | * skb for the inner packet. | |
242 | * Namely we need to: | |
243 | * - reset xfrm (IPSec) information as it applies to | |
244 | * the outer L2TP packet and not to the inner one | |
245 | * - release the dst to force a route lookup on the inner | |
246 | * IP packet since skb->dst currently points to the dst | |
247 | * of the UDP tunnel | |
248 | * - reset netfilter information as it doesn't apply | |
249 | * to the inner packet either | |
250 | */ | |
251 | secpath_reset(skb); | |
252 | skb_dst_drop(skb); | |
253 | nf_reset(skb); | |
254 | ||
255 | po = pppox_sk(sk); | |
256 | ppp_input(&po->chan, skb); | |
257 | } else { | |
a4ca44fa JP |
258 | l2tp_info(session, PPPOL2TP_MSG_DATA, "%s: socket not bound\n", |
259 | session->name); | |
fd558d18 JC |
260 | |
261 | /* Not bound. Nothing we can do, so discard. */ | |
262 | session->stats.rx_errors++; | |
263 | kfree_skb(skb); | |
264 | } | |
265 | ||
266 | return; | |
267 | ||
268 | no_sock: | |
a4ca44fa | 269 | l2tp_info(session, PPPOL2TP_MSG_DATA, "%s: no socket\n", session->name); |
fd558d18 JC |
270 | kfree_skb(skb); |
271 | } | |
272 | ||
273 | static void pppol2tp_session_sock_hold(struct l2tp_session *session) | |
274 | { | |
275 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
276 | ||
277 | if (ps->sock) | |
278 | sock_hold(ps->sock); | |
279 | } | |
280 | ||
281 | static void pppol2tp_session_sock_put(struct l2tp_session *session) | |
282 | { | |
283 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
284 | ||
285 | if (ps->sock) | |
286 | sock_put(ps->sock); | |
287 | } | |
288 | ||
289 | /************************************************************************ | |
290 | * Transmit handling | |
291 | ***********************************************************************/ | |
292 | ||
fd558d18 JC |
293 | /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here |
294 | * when a user application does a sendmsg() on the session socket. L2TP and | |
295 | * PPP headers must be inserted into the user's data. | |
296 | */ | |
297 | static int pppol2tp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
298 | size_t total_len) | |
299 | { | |
300 | static const unsigned char ppph[2] = { 0xff, 0x03 }; | |
301 | struct sock *sk = sock->sk; | |
302 | struct sk_buff *skb; | |
303 | int error; | |
304 | struct l2tp_session *session; | |
305 | struct l2tp_tunnel *tunnel; | |
306 | struct pppol2tp_session *ps; | |
0d76751f | 307 | int uhlen; |
fd558d18 JC |
308 | |
309 | error = -ENOTCONN; | |
310 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
311 | goto error; | |
312 | ||
313 | /* Get session and tunnel contexts */ | |
314 | error = -EBADF; | |
315 | session = pppol2tp_sock_to_session(sk); | |
316 | if (session == NULL) | |
317 | goto error; | |
318 | ||
319 | ps = l2tp_session_priv(session); | |
320 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
321 | if (tunnel == NULL) | |
322 | goto error_put_sess; | |
323 | ||
0d76751f JC |
324 | uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0; |
325 | ||
fd558d18 JC |
326 | /* Allocate a socket buffer */ |
327 | error = -ENOMEM; | |
328 | skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) + | |
0d76751f | 329 | uhlen + session->hdr_len + |
fd558d18 JC |
330 | sizeof(ppph) + total_len, |
331 | 0, GFP_KERNEL); | |
332 | if (!skb) | |
333 | goto error_put_sess_tun; | |
334 | ||
335 | /* Reserve space for headers. */ | |
336 | skb_reserve(skb, NET_SKB_PAD); | |
337 | skb_reset_network_header(skb); | |
338 | skb_reserve(skb, sizeof(struct iphdr)); | |
339 | skb_reset_transport_header(skb); | |
0d76751f | 340 | skb_reserve(skb, uhlen); |
fd558d18 JC |
341 | |
342 | /* Add PPP header */ | |
343 | skb->data[0] = ppph[0]; | |
344 | skb->data[1] = ppph[1]; | |
345 | skb_put(skb, 2); | |
346 | ||
347 | /* Copy user data into skb */ | |
348 | error = memcpy_fromiovec(skb->data, m->msg_iov, total_len); | |
349 | if (error < 0) { | |
350 | kfree_skb(skb); | |
351 | goto error_put_sess_tun; | |
352 | } | |
353 | skb_put(skb, total_len); | |
354 | ||
355 | l2tp_xmit_skb(session, skb, session->hdr_len); | |
356 | ||
357 | sock_put(ps->tunnel_sock); | |
358 | ||
359 | return error; | |
360 | ||
361 | error_put_sess_tun: | |
362 | sock_put(ps->tunnel_sock); | |
363 | error_put_sess: | |
364 | sock_put(sk); | |
365 | error: | |
366 | return error; | |
367 | } | |
368 | ||
369 | /* Transmit function called by generic PPP driver. Sends PPP frame | |
370 | * over PPPoL2TP socket. | |
371 | * | |
372 | * This is almost the same as pppol2tp_sendmsg(), but rather than | |
373 | * being called with a msghdr from userspace, it is called with a skb | |
374 | * from the kernel. | |
375 | * | |
376 | * The supplied skb from ppp doesn't have enough headroom for the | |
377 | * insertion of L2TP, UDP and IP headers so we need to allocate more | |
378 | * headroom in the skb. This will create a cloned skb. But we must be | |
379 | * careful in the error case because the caller will expect to free | |
380 | * the skb it supplied, not our cloned skb. So we take care to always | |
381 | * leave the original skb unfreed if we return an error. | |
382 | */ | |
383 | static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb) | |
384 | { | |
385 | static const u8 ppph[2] = { 0xff, 0x03 }; | |
386 | struct sock *sk = (struct sock *) chan->private; | |
387 | struct sock *sk_tun; | |
fd558d18 JC |
388 | struct l2tp_session *session; |
389 | struct l2tp_tunnel *tunnel; | |
390 | struct pppol2tp_session *ps; | |
391 | int old_headroom; | |
392 | int new_headroom; | |
09df57ca | 393 | int uhlen, headroom; |
fd558d18 JC |
394 | |
395 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
396 | goto abort; | |
397 | ||
398 | /* Get session and tunnel contexts from the socket */ | |
399 | session = pppol2tp_sock_to_session(sk); | |
400 | if (session == NULL) | |
401 | goto abort; | |
402 | ||
403 | ps = l2tp_session_priv(session); | |
404 | sk_tun = ps->tunnel_sock; | |
405 | if (sk_tun == NULL) | |
406 | goto abort_put_sess; | |
407 | tunnel = l2tp_sock_to_tunnel(sk_tun); | |
408 | if (tunnel == NULL) | |
409 | goto abort_put_sess; | |
410 | ||
fd558d18 | 411 | old_headroom = skb_headroom(skb); |
09df57ca ED |
412 | uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0; |
413 | headroom = NET_SKB_PAD + | |
414 | sizeof(struct iphdr) + /* IP header */ | |
415 | uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */ | |
416 | session->hdr_len + /* L2TP header */ | |
417 | sizeof(ppph); /* PPP header */ | |
418 | if (skb_cow_head(skb, headroom)) | |
fd558d18 JC |
419 | goto abort_put_sess_tun; |
420 | ||
421 | new_headroom = skb_headroom(skb); | |
422 | skb->truesize += new_headroom - old_headroom; | |
423 | ||
424 | /* Setup PPP header */ | |
425 | __skb_push(skb, sizeof(ppph)); | |
426 | skb->data[0] = ppph[0]; | |
427 | skb->data[1] = ppph[1]; | |
428 | ||
e0d4435f | 429 | l2tp_xmit_skb(session, skb, session->hdr_len); |
fd558d18 JC |
430 | |
431 | sock_put(sk_tun); | |
432 | sock_put(sk); | |
433 | return 1; | |
434 | ||
435 | abort_put_sess_tun: | |
436 | sock_put(sk_tun); | |
437 | abort_put_sess: | |
438 | sock_put(sk); | |
439 | abort: | |
440 | /* Free the original skb */ | |
441 | kfree_skb(skb); | |
442 | return 1; | |
443 | } | |
444 | ||
445 | /***************************************************************************** | |
446 | * Session (and tunnel control) socket create/destroy. | |
447 | *****************************************************************************/ | |
448 | ||
449 | /* Called by l2tp_core when a session socket is being closed. | |
450 | */ | |
451 | static void pppol2tp_session_close(struct l2tp_session *session) | |
452 | { | |
453 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
454 | struct sock *sk = ps->sock; | |
455 | struct sk_buff *skb; | |
456 | ||
457 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
458 | ||
459 | if (session->session_id == 0) | |
460 | goto out; | |
461 | ||
462 | if (sk != NULL) { | |
463 | lock_sock(sk); | |
464 | ||
465 | if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) { | |
466 | pppox_unbind_sock(sk); | |
467 | sk->sk_state = PPPOX_DEAD; | |
468 | sk->sk_state_change(sk); | |
469 | } | |
470 | ||
471 | /* Purge any queued data */ | |
472 | skb_queue_purge(&sk->sk_receive_queue); | |
473 | skb_queue_purge(&sk->sk_write_queue); | |
474 | while ((skb = skb_dequeue(&session->reorder_q))) { | |
475 | kfree_skb(skb); | |
476 | sock_put(sk); | |
477 | } | |
478 | ||
479 | release_sock(sk); | |
480 | } | |
481 | ||
482 | out: | |
483 | return; | |
484 | } | |
485 | ||
486 | /* Really kill the session socket. (Called from sock_put() if | |
487 | * refcnt == 0.) | |
488 | */ | |
489 | static void pppol2tp_session_destruct(struct sock *sk) | |
490 | { | |
491 | struct l2tp_session *session; | |
492 | ||
493 | if (sk->sk_user_data != NULL) { | |
494 | session = sk->sk_user_data; | |
495 | if (session == NULL) | |
496 | goto out; | |
497 | ||
498 | sk->sk_user_data = NULL; | |
499 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
500 | l2tp_session_dec_refcount(session); | |
501 | } | |
502 | ||
503 | out: | |
504 | return; | |
505 | } | |
506 | ||
507 | /* Called when the PPPoX socket (session) is closed. | |
508 | */ | |
509 | static int pppol2tp_release(struct socket *sock) | |
510 | { | |
511 | struct sock *sk = sock->sk; | |
512 | struct l2tp_session *session; | |
513 | int error; | |
514 | ||
515 | if (!sk) | |
516 | return 0; | |
517 | ||
518 | error = -EBADF; | |
519 | lock_sock(sk); | |
520 | if (sock_flag(sk, SOCK_DEAD) != 0) | |
521 | goto error; | |
522 | ||
523 | pppox_unbind_sock(sk); | |
524 | ||
525 | /* Signal the death of the socket. */ | |
526 | sk->sk_state = PPPOX_DEAD; | |
527 | sock_orphan(sk); | |
528 | sock->sk = NULL; | |
529 | ||
530 | session = pppol2tp_sock_to_session(sk); | |
531 | ||
532 | /* Purge any queued data */ | |
533 | skb_queue_purge(&sk->sk_receive_queue); | |
534 | skb_queue_purge(&sk->sk_write_queue); | |
535 | if (session != NULL) { | |
536 | struct sk_buff *skb; | |
537 | while ((skb = skb_dequeue(&session->reorder_q))) { | |
538 | kfree_skb(skb); | |
539 | sock_put(sk); | |
540 | } | |
541 | sock_put(sk); | |
542 | } | |
543 | ||
544 | release_sock(sk); | |
545 | ||
546 | /* This will delete the session context via | |
547 | * pppol2tp_session_destruct() if the socket's refcnt drops to | |
548 | * zero. | |
549 | */ | |
550 | sock_put(sk); | |
551 | ||
552 | return 0; | |
553 | ||
554 | error: | |
555 | release_sock(sk); | |
556 | return error; | |
557 | } | |
558 | ||
559 | static struct proto pppol2tp_sk_proto = { | |
560 | .name = "PPPOL2TP", | |
561 | .owner = THIS_MODULE, | |
562 | .obj_size = sizeof(struct pppox_sock), | |
563 | }; | |
564 | ||
565 | static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb) | |
566 | { | |
567 | int rc; | |
568 | ||
569 | rc = l2tp_udp_encap_recv(sk, skb); | |
570 | if (rc) | |
571 | kfree_skb(skb); | |
572 | ||
573 | return NET_RX_SUCCESS; | |
574 | } | |
575 | ||
576 | /* socket() handler. Initialize a new struct sock. | |
577 | */ | |
578 | static int pppol2tp_create(struct net *net, struct socket *sock) | |
579 | { | |
580 | int error = -ENOMEM; | |
581 | struct sock *sk; | |
582 | ||
583 | sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto); | |
584 | if (!sk) | |
585 | goto out; | |
586 | ||
587 | sock_init_data(sock, sk); | |
588 | ||
589 | sock->state = SS_UNCONNECTED; | |
590 | sock->ops = &pppol2tp_ops; | |
591 | ||
592 | sk->sk_backlog_rcv = pppol2tp_backlog_recv; | |
593 | sk->sk_protocol = PX_PROTO_OL2TP; | |
594 | sk->sk_family = PF_PPPOX; | |
595 | sk->sk_state = PPPOX_NONE; | |
596 | sk->sk_type = SOCK_STREAM; | |
597 | sk->sk_destruct = pppol2tp_session_destruct; | |
598 | ||
599 | error = 0; | |
600 | ||
601 | out: | |
602 | return error; | |
603 | } | |
604 | ||
f66ef2d0 | 605 | #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE) |
0ad66140 JC |
606 | static void pppol2tp_show(struct seq_file *m, void *arg) |
607 | { | |
608 | struct l2tp_session *session = arg; | |
609 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
610 | ||
611 | if (ps) { | |
612 | struct pppox_sock *po = pppox_sk(ps->sock); | |
613 | if (po) | |
614 | seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan)); | |
615 | } | |
616 | } | |
617 | #endif | |
618 | ||
fd558d18 JC |
619 | /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket |
620 | */ | |
621 | static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr, | |
622 | int sockaddr_len, int flags) | |
623 | { | |
624 | struct sock *sk = sock->sk; | |
625 | struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr; | |
626 | struct pppox_sock *po = pppox_sk(sk); | |
627 | struct l2tp_session *session = NULL; | |
628 | struct l2tp_tunnel *tunnel; | |
629 | struct pppol2tp_session *ps; | |
630 | struct dst_entry *dst; | |
631 | struct l2tp_session_cfg cfg = { 0, }; | |
632 | int error = 0; | |
e0d4435f JC |
633 | u32 tunnel_id, peer_tunnel_id; |
634 | u32 session_id, peer_session_id; | |
635 | int ver = 2; | |
636 | int fd; | |
fd558d18 JC |
637 | |
638 | lock_sock(sk); | |
639 | ||
640 | error = -EINVAL; | |
641 | if (sp->sa_protocol != PX_PROTO_OL2TP) | |
642 | goto end; | |
643 | ||
644 | /* Check for already bound sockets */ | |
645 | error = -EBUSY; | |
646 | if (sk->sk_state & PPPOX_CONNECTED) | |
647 | goto end; | |
648 | ||
649 | /* We don't supporting rebinding anyway */ | |
650 | error = -EALREADY; | |
651 | if (sk->sk_user_data) | |
652 | goto end; /* socket is already attached */ | |
653 | ||
b79585f5 JC |
654 | /* Get params from socket address. Handle L2TPv2 and L2TPv3. |
655 | * This is nasty because there are different sockaddr_pppol2tp | |
656 | * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use | |
657 | * the sockaddr size to determine which structure the caller | |
658 | * is using. | |
659 | */ | |
660 | peer_tunnel_id = 0; | |
e0d4435f JC |
661 | if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) { |
662 | fd = sp->pppol2tp.fd; | |
663 | tunnel_id = sp->pppol2tp.s_tunnel; | |
664 | peer_tunnel_id = sp->pppol2tp.d_tunnel; | |
665 | session_id = sp->pppol2tp.s_session; | |
666 | peer_session_id = sp->pppol2tp.d_session; | |
667 | } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) { | |
b79585f5 JC |
668 | struct sockaddr_pppol2tpv3 *sp3 = |
669 | (struct sockaddr_pppol2tpv3 *) sp; | |
e0d4435f JC |
670 | ver = 3; |
671 | fd = sp3->pppol2tp.fd; | |
672 | tunnel_id = sp3->pppol2tp.s_tunnel; | |
673 | peer_tunnel_id = sp3->pppol2tp.d_tunnel; | |
674 | session_id = sp3->pppol2tp.s_session; | |
675 | peer_session_id = sp3->pppol2tp.d_session; | |
b79585f5 JC |
676 | } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpin6)) { |
677 | struct sockaddr_pppol2tpin6 *sp6 = | |
678 | (struct sockaddr_pppol2tpin6 *) sp; | |
679 | fd = sp6->pppol2tp.fd; | |
680 | tunnel_id = sp6->pppol2tp.s_tunnel; | |
681 | peer_tunnel_id = sp6->pppol2tp.d_tunnel; | |
682 | session_id = sp6->pppol2tp.s_session; | |
683 | peer_session_id = sp6->pppol2tp.d_session; | |
684 | } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3in6)) { | |
685 | struct sockaddr_pppol2tpv3in6 *sp6 = | |
686 | (struct sockaddr_pppol2tpv3in6 *) sp; | |
687 | ver = 3; | |
688 | fd = sp6->pppol2tp.fd; | |
689 | tunnel_id = sp6->pppol2tp.s_tunnel; | |
690 | peer_tunnel_id = sp6->pppol2tp.d_tunnel; | |
691 | session_id = sp6->pppol2tp.s_session; | |
692 | peer_session_id = sp6->pppol2tp.d_session; | |
e0d4435f JC |
693 | } else { |
694 | error = -EINVAL; | |
695 | goto end; /* bad socket address */ | |
696 | } | |
697 | ||
698 | /* Don't bind if tunnel_id is 0 */ | |
fd558d18 | 699 | error = -EINVAL; |
e0d4435f | 700 | if (tunnel_id == 0) |
fd558d18 JC |
701 | goto end; |
702 | ||
309795f4 JC |
703 | tunnel = l2tp_tunnel_find(sock_net(sk), tunnel_id); |
704 | ||
e0d4435f JC |
705 | /* Special case: create tunnel context if session_id and |
706 | * peer_session_id is 0. Otherwise look up tunnel using supplied | |
fd558d18 JC |
707 | * tunnel id. |
708 | */ | |
e0d4435f | 709 | if ((session_id == 0) && (peer_session_id == 0)) { |
309795f4 JC |
710 | if (tunnel == NULL) { |
711 | struct l2tp_tunnel_cfg tcfg = { | |
712 | .encap = L2TP_ENCAPTYPE_UDP, | |
713 | .debug = 0, | |
714 | }; | |
715 | error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel); | |
716 | if (error < 0) | |
717 | goto end; | |
718 | } | |
fd558d18 | 719 | } else { |
fd558d18 JC |
720 | /* Error if we can't find the tunnel */ |
721 | error = -ENOENT; | |
722 | if (tunnel == NULL) | |
723 | goto end; | |
724 | ||
725 | /* Error if socket is not prepped */ | |
726 | if (tunnel->sock == NULL) | |
727 | goto end; | |
728 | } | |
729 | ||
730 | if (tunnel->recv_payload_hook == NULL) | |
731 | tunnel->recv_payload_hook = pppol2tp_recv_payload_hook; | |
732 | ||
b79585f5 JC |
733 | if (tunnel->peer_tunnel_id == 0) |
734 | tunnel->peer_tunnel_id = peer_tunnel_id; | |
fd558d18 | 735 | |
309795f4 JC |
736 | /* Create session if it doesn't already exist. We handle the |
737 | * case where a session was previously created by the netlink | |
738 | * interface by checking that the session doesn't already have | |
739 | * a socket and its tunnel socket are what we expect. If any | |
740 | * of those checks fail, return EEXIST to the caller. | |
741 | */ | |
742 | session = l2tp_session_find(sock_net(sk), tunnel, session_id); | |
fd558d18 | 743 | if (session == NULL) { |
309795f4 JC |
744 | /* Default MTU must allow space for UDP/L2TP/PPP |
745 | * headers. | |
746 | */ | |
747 | cfg.mtu = cfg.mru = 1500 - PPPOL2TP_HEADER_OVERHEAD; | |
748 | ||
749 | /* Allocate and initialize a new session context. */ | |
750 | session = l2tp_session_create(sizeof(struct pppol2tp_session), | |
751 | tunnel, session_id, | |
752 | peer_session_id, &cfg); | |
753 | if (session == NULL) { | |
754 | error = -ENOMEM; | |
755 | goto end; | |
756 | } | |
757 | } else { | |
758 | ps = l2tp_session_priv(session); | |
759 | error = -EEXIST; | |
760 | if (ps->sock != NULL) | |
761 | goto end; | |
762 | ||
763 | /* consistency checks */ | |
764 | if (ps->tunnel_sock != tunnel->sock) | |
765 | goto end; | |
fd558d18 JC |
766 | } |
767 | ||
309795f4 | 768 | /* Associate session with its PPPoL2TP socket */ |
fd558d18 JC |
769 | ps = l2tp_session_priv(session); |
770 | ps->owner = current->pid; | |
771 | ps->sock = sk; | |
772 | ps->tunnel_sock = tunnel->sock; | |
773 | ||
774 | session->recv_skb = pppol2tp_recv; | |
775 | session->session_close = pppol2tp_session_close; | |
f66ef2d0 | 776 | #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE) |
0ad66140 JC |
777 | session->show = pppol2tp_show; |
778 | #endif | |
fd558d18 JC |
779 | |
780 | /* We need to know each time a skb is dropped from the reorder | |
781 | * queue. | |
782 | */ | |
783 | session->ref = pppol2tp_session_sock_hold; | |
784 | session->deref = pppol2tp_session_sock_put; | |
785 | ||
786 | /* If PMTU discovery was enabled, use the MTU that was discovered */ | |
787 | dst = sk_dst_get(sk); | |
788 | if (dst != NULL) { | |
789 | u32 pmtu = dst_mtu(__sk_dst_get(sk)); | |
790 | if (pmtu != 0) | |
791 | session->mtu = session->mru = pmtu - | |
792 | PPPOL2TP_HEADER_OVERHEAD; | |
793 | dst_release(dst); | |
794 | } | |
795 | ||
796 | /* Special case: if source & dest session_id == 0x0000, this | |
797 | * socket is being created to manage the tunnel. Just set up | |
798 | * the internal context for use by ioctl() and sockopt() | |
799 | * handlers. | |
800 | */ | |
801 | if ((session->session_id == 0) && | |
802 | (session->peer_session_id == 0)) { | |
803 | error = 0; | |
804 | goto out_no_ppp; | |
805 | } | |
806 | ||
807 | /* The only header we need to worry about is the L2TP | |
808 | * header. This size is different depending on whether | |
809 | * sequence numbers are enabled for the data channel. | |
810 | */ | |
811 | po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
812 | ||
813 | po->chan.private = sk; | |
814 | po->chan.ops = &pppol2tp_chan_ops; | |
815 | po->chan.mtu = session->mtu; | |
816 | ||
817 | error = ppp_register_net_channel(sock_net(sk), &po->chan); | |
818 | if (error) | |
819 | goto end; | |
820 | ||
821 | out_no_ppp: | |
822 | /* This is how we get the session context from the socket. */ | |
823 | sk->sk_user_data = session; | |
824 | sk->sk_state = PPPOX_CONNECTED; | |
a4ca44fa JP |
825 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: created\n", |
826 | session->name); | |
fd558d18 JC |
827 | |
828 | end: | |
829 | release_sock(sk); | |
830 | ||
831 | return error; | |
832 | } | |
833 | ||
309795f4 JC |
834 | #ifdef CONFIG_L2TP_V3 |
835 | ||
836 | /* Called when creating sessions via the netlink interface. | |
837 | */ | |
838 | static int pppol2tp_session_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg) | |
839 | { | |
840 | int error; | |
841 | struct l2tp_tunnel *tunnel; | |
842 | struct l2tp_session *session; | |
843 | struct pppol2tp_session *ps; | |
844 | ||
845 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
846 | ||
847 | /* Error if we can't find the tunnel */ | |
848 | error = -ENOENT; | |
849 | if (tunnel == NULL) | |
850 | goto out; | |
851 | ||
852 | /* Error if tunnel socket is not prepped */ | |
853 | if (tunnel->sock == NULL) | |
854 | goto out; | |
855 | ||
856 | /* Check that this session doesn't already exist */ | |
857 | error = -EEXIST; | |
858 | session = l2tp_session_find(net, tunnel, session_id); | |
859 | if (session != NULL) | |
860 | goto out; | |
861 | ||
862 | /* Default MTU values. */ | |
863 | if (cfg->mtu == 0) | |
864 | cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD; | |
865 | if (cfg->mru == 0) | |
866 | cfg->mru = cfg->mtu; | |
867 | ||
868 | /* Allocate and initialize a new session context. */ | |
869 | error = -ENOMEM; | |
870 | session = l2tp_session_create(sizeof(struct pppol2tp_session), | |
871 | tunnel, session_id, | |
872 | peer_session_id, cfg); | |
873 | if (session == NULL) | |
874 | goto out; | |
875 | ||
876 | ps = l2tp_session_priv(session); | |
877 | ps->tunnel_sock = tunnel->sock; | |
878 | ||
a4ca44fa JP |
879 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: created\n", |
880 | session->name); | |
309795f4 JC |
881 | |
882 | error = 0; | |
883 | ||
884 | out: | |
885 | return error; | |
886 | } | |
887 | ||
888 | /* Called when deleting sessions via the netlink interface. | |
889 | */ | |
890 | static int pppol2tp_session_delete(struct l2tp_session *session) | |
891 | { | |
892 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
893 | ||
894 | if (ps->sock == NULL) | |
895 | l2tp_session_dec_refcount(session); | |
896 | ||
897 | return 0; | |
898 | } | |
899 | ||
900 | #endif /* CONFIG_L2TP_V3 */ | |
901 | ||
fd558d18 JC |
902 | /* getname() support. |
903 | */ | |
904 | static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr, | |
905 | int *usockaddr_len, int peer) | |
906 | { | |
e0d4435f | 907 | int len = 0; |
fd558d18 JC |
908 | int error = 0; |
909 | struct l2tp_session *session; | |
910 | struct l2tp_tunnel *tunnel; | |
911 | struct sock *sk = sock->sk; | |
912 | struct inet_sock *inet; | |
913 | struct pppol2tp_session *pls; | |
914 | ||
915 | error = -ENOTCONN; | |
916 | if (sk == NULL) | |
917 | goto end; | |
918 | if (sk->sk_state != PPPOX_CONNECTED) | |
919 | goto end; | |
920 | ||
921 | error = -EBADF; | |
922 | session = pppol2tp_sock_to_session(sk); | |
923 | if (session == NULL) | |
924 | goto end; | |
925 | ||
926 | pls = l2tp_session_priv(session); | |
927 | tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock); | |
928 | if (tunnel == NULL) { | |
929 | error = -EBADF; | |
930 | goto end_put_sess; | |
931 | } | |
932 | ||
bbdb32cb | 933 | inet = inet_sk(tunnel->sock); |
d2cf3361 | 934 | if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) { |
e0d4435f JC |
935 | struct sockaddr_pppol2tp sp; |
936 | len = sizeof(sp); | |
937 | memset(&sp, 0, len); | |
938 | sp.sa_family = AF_PPPOX; | |
939 | sp.sa_protocol = PX_PROTO_OL2TP; | |
940 | sp.pppol2tp.fd = tunnel->fd; | |
941 | sp.pppol2tp.pid = pls->owner; | |
942 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
943 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
944 | sp.pppol2tp.s_session = session->session_id; | |
945 | sp.pppol2tp.d_session = session->peer_session_id; | |
946 | sp.pppol2tp.addr.sin_family = AF_INET; | |
947 | sp.pppol2tp.addr.sin_port = inet->inet_dport; | |
948 | sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr; | |
949 | memcpy(uaddr, &sp, len); | |
d2cf3361 BL |
950 | #if IS_ENABLED(CONFIG_IPV6) |
951 | } else if ((tunnel->version == 2) && | |
952 | (tunnel->sock->sk_family == AF_INET6)) { | |
953 | struct ipv6_pinfo *np = inet6_sk(tunnel->sock); | |
954 | struct sockaddr_pppol2tpin6 sp; | |
955 | len = sizeof(sp); | |
956 | memset(&sp, 0, len); | |
957 | sp.sa_family = AF_PPPOX; | |
958 | sp.sa_protocol = PX_PROTO_OL2TP; | |
959 | sp.pppol2tp.fd = tunnel->fd; | |
960 | sp.pppol2tp.pid = pls->owner; | |
961 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
962 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
963 | sp.pppol2tp.s_session = session->session_id; | |
964 | sp.pppol2tp.d_session = session->peer_session_id; | |
965 | sp.pppol2tp.addr.sin6_family = AF_INET6; | |
966 | sp.pppol2tp.addr.sin6_port = inet->inet_dport; | |
967 | memcpy(&sp.pppol2tp.addr.sin6_addr, &np->daddr, | |
968 | sizeof(np->daddr)); | |
969 | memcpy(uaddr, &sp, len); | |
970 | } else if ((tunnel->version == 3) && | |
971 | (tunnel->sock->sk_family == AF_INET6)) { | |
972 | struct ipv6_pinfo *np = inet6_sk(tunnel->sock); | |
973 | struct sockaddr_pppol2tpv3in6 sp; | |
974 | len = sizeof(sp); | |
975 | memset(&sp, 0, len); | |
976 | sp.sa_family = AF_PPPOX; | |
977 | sp.sa_protocol = PX_PROTO_OL2TP; | |
978 | sp.pppol2tp.fd = tunnel->fd; | |
979 | sp.pppol2tp.pid = pls->owner; | |
980 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
981 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
982 | sp.pppol2tp.s_session = session->session_id; | |
983 | sp.pppol2tp.d_session = session->peer_session_id; | |
984 | sp.pppol2tp.addr.sin6_family = AF_INET6; | |
985 | sp.pppol2tp.addr.sin6_port = inet->inet_dport; | |
986 | memcpy(&sp.pppol2tp.addr.sin6_addr, &np->daddr, | |
987 | sizeof(np->daddr)); | |
988 | memcpy(uaddr, &sp, len); | |
989 | #endif | |
e0d4435f JC |
990 | } else if (tunnel->version == 3) { |
991 | struct sockaddr_pppol2tpv3 sp; | |
992 | len = sizeof(sp); | |
993 | memset(&sp, 0, len); | |
994 | sp.sa_family = AF_PPPOX; | |
995 | sp.sa_protocol = PX_PROTO_OL2TP; | |
996 | sp.pppol2tp.fd = tunnel->fd; | |
997 | sp.pppol2tp.pid = pls->owner; | |
998 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
999 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
1000 | sp.pppol2tp.s_session = session->session_id; | |
1001 | sp.pppol2tp.d_session = session->peer_session_id; | |
1002 | sp.pppol2tp.addr.sin_family = AF_INET; | |
1003 | sp.pppol2tp.addr.sin_port = inet->inet_dport; | |
1004 | sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr; | |
1005 | memcpy(uaddr, &sp, len); | |
1006 | } | |
fd558d18 JC |
1007 | |
1008 | *usockaddr_len = len; | |
1009 | ||
1010 | sock_put(pls->tunnel_sock); | |
1011 | end_put_sess: | |
1012 | sock_put(sk); | |
1013 | error = 0; | |
1014 | ||
1015 | end: | |
1016 | return error; | |
1017 | } | |
1018 | ||
1019 | /**************************************************************************** | |
1020 | * ioctl() handlers. | |
1021 | * | |
1022 | * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP | |
1023 | * sockets. However, in order to control kernel tunnel features, we allow | |
1024 | * userspace to create a special "tunnel" PPPoX socket which is used for | |
1025 | * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow | |
1026 | * the user application to issue L2TP setsockopt(), getsockopt() and ioctl() | |
1027 | * calls. | |
1028 | ****************************************************************************/ | |
1029 | ||
1030 | static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest, | |
1031 | struct l2tp_stats *stats) | |
1032 | { | |
1033 | dest->tx_packets = stats->tx_packets; | |
1034 | dest->tx_bytes = stats->tx_bytes; | |
1035 | dest->tx_errors = stats->tx_errors; | |
1036 | dest->rx_packets = stats->rx_packets; | |
1037 | dest->rx_bytes = stats->rx_bytes; | |
1038 | dest->rx_seq_discards = stats->rx_seq_discards; | |
1039 | dest->rx_oos_packets = stats->rx_oos_packets; | |
1040 | dest->rx_errors = stats->rx_errors; | |
1041 | } | |
1042 | ||
1043 | /* Session ioctl helper. | |
1044 | */ | |
1045 | static int pppol2tp_session_ioctl(struct l2tp_session *session, | |
1046 | unsigned int cmd, unsigned long arg) | |
1047 | { | |
1048 | struct ifreq ifr; | |
1049 | int err = 0; | |
1050 | struct sock *sk; | |
1051 | int val = (int) arg; | |
1052 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
1053 | struct l2tp_tunnel *tunnel = session->tunnel; | |
1054 | struct pppol2tp_ioc_stats stats; | |
1055 | ||
a4ca44fa JP |
1056 | l2tp_dbg(session, PPPOL2TP_MSG_CONTROL, |
1057 | "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n", | |
1058 | session->name, cmd, arg); | |
fd558d18 JC |
1059 | |
1060 | sk = ps->sock; | |
1061 | sock_hold(sk); | |
1062 | ||
1063 | switch (cmd) { | |
1064 | case SIOCGIFMTU: | |
1065 | err = -ENXIO; | |
1066 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1067 | break; | |
1068 | ||
1069 | err = -EFAULT; | |
1070 | if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq))) | |
1071 | break; | |
1072 | ifr.ifr_mtu = session->mtu; | |
1073 | if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq))) | |
1074 | break; | |
1075 | ||
a4ca44fa JP |
1076 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get mtu=%d\n", |
1077 | session->name, session->mtu); | |
fd558d18 JC |
1078 | err = 0; |
1079 | break; | |
1080 | ||
1081 | case SIOCSIFMTU: | |
1082 | err = -ENXIO; | |
1083 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1084 | break; | |
1085 | ||
1086 | err = -EFAULT; | |
1087 | if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq))) | |
1088 | break; | |
1089 | ||
1090 | session->mtu = ifr.ifr_mtu; | |
1091 | ||
a4ca44fa JP |
1092 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set mtu=%d\n", |
1093 | session->name, session->mtu); | |
fd558d18 JC |
1094 | err = 0; |
1095 | break; | |
1096 | ||
1097 | case PPPIOCGMRU: | |
1098 | err = -ENXIO; | |
1099 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1100 | break; | |
1101 | ||
1102 | err = -EFAULT; | |
1103 | if (put_user(session->mru, (int __user *) arg)) | |
1104 | break; | |
1105 | ||
a4ca44fa JP |
1106 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get mru=%d\n", |
1107 | session->name, session->mru); | |
fd558d18 JC |
1108 | err = 0; |
1109 | break; | |
1110 | ||
1111 | case PPPIOCSMRU: | |
1112 | err = -ENXIO; | |
1113 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1114 | break; | |
1115 | ||
1116 | err = -EFAULT; | |
1117 | if (get_user(val, (int __user *) arg)) | |
1118 | break; | |
1119 | ||
1120 | session->mru = val; | |
a4ca44fa JP |
1121 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set mru=%d\n", |
1122 | session->name, session->mru); | |
fd558d18 JC |
1123 | err = 0; |
1124 | break; | |
1125 | ||
1126 | case PPPIOCGFLAGS: | |
1127 | err = -EFAULT; | |
1128 | if (put_user(ps->flags, (int __user *) arg)) | |
1129 | break; | |
1130 | ||
a4ca44fa JP |
1131 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get flags=%d\n", |
1132 | session->name, ps->flags); | |
fd558d18 JC |
1133 | err = 0; |
1134 | break; | |
1135 | ||
1136 | case PPPIOCSFLAGS: | |
1137 | err = -EFAULT; | |
1138 | if (get_user(val, (int __user *) arg)) | |
1139 | break; | |
1140 | ps->flags = val; | |
a4ca44fa JP |
1141 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set flags=%d\n", |
1142 | session->name, ps->flags); | |
fd558d18 JC |
1143 | err = 0; |
1144 | break; | |
1145 | ||
1146 | case PPPIOCGL2TPSTATS: | |
1147 | err = -ENXIO; | |
1148 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1149 | break; | |
1150 | ||
1151 | memset(&stats, 0, sizeof(stats)); | |
1152 | stats.tunnel_id = tunnel->tunnel_id; | |
1153 | stats.session_id = session->session_id; | |
1154 | pppol2tp_copy_stats(&stats, &session->stats); | |
1155 | if (copy_to_user((void __user *) arg, &stats, | |
1156 | sizeof(stats))) | |
1157 | break; | |
a4ca44fa JP |
1158 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get L2TP stats\n", |
1159 | session->name); | |
fd558d18 JC |
1160 | err = 0; |
1161 | break; | |
1162 | ||
1163 | default: | |
1164 | err = -ENOSYS; | |
1165 | break; | |
1166 | } | |
1167 | ||
1168 | sock_put(sk); | |
1169 | ||
1170 | return err; | |
1171 | } | |
1172 | ||
1173 | /* Tunnel ioctl helper. | |
1174 | * | |
1175 | * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data | |
1176 | * specifies a session_id, the session ioctl handler is called. This allows an | |
1177 | * application to retrieve session stats via a tunnel socket. | |
1178 | */ | |
1179 | static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel, | |
1180 | unsigned int cmd, unsigned long arg) | |
1181 | { | |
1182 | int err = 0; | |
1183 | struct sock *sk; | |
1184 | struct pppol2tp_ioc_stats stats; | |
1185 | ||
a4ca44fa JP |
1186 | l2tp_dbg(tunnel, PPPOL2TP_MSG_CONTROL, |
1187 | "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n", | |
1188 | tunnel->name, cmd, arg); | |
fd558d18 JC |
1189 | |
1190 | sk = tunnel->sock; | |
1191 | sock_hold(sk); | |
1192 | ||
1193 | switch (cmd) { | |
1194 | case PPPIOCGL2TPSTATS: | |
1195 | err = -ENXIO; | |
1196 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1197 | break; | |
1198 | ||
1199 | if (copy_from_user(&stats, (void __user *) arg, | |
1200 | sizeof(stats))) { | |
1201 | err = -EFAULT; | |
1202 | break; | |
1203 | } | |
1204 | if (stats.session_id != 0) { | |
1205 | /* resend to session ioctl handler */ | |
1206 | struct l2tp_session *session = | |
f7faffa3 | 1207 | l2tp_session_find(sock_net(sk), tunnel, stats.session_id); |
fd558d18 JC |
1208 | if (session != NULL) |
1209 | err = pppol2tp_session_ioctl(session, cmd, arg); | |
1210 | else | |
1211 | err = -EBADR; | |
1212 | break; | |
1213 | } | |
1214 | #ifdef CONFIG_XFRM | |
1215 | stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0; | |
1216 | #endif | |
1217 | pppol2tp_copy_stats(&stats, &tunnel->stats); | |
1218 | if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) { | |
1219 | err = -EFAULT; | |
1220 | break; | |
1221 | } | |
a4ca44fa JP |
1222 | l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: get L2TP stats\n", |
1223 | tunnel->name); | |
fd558d18 JC |
1224 | err = 0; |
1225 | break; | |
1226 | ||
1227 | default: | |
1228 | err = -ENOSYS; | |
1229 | break; | |
1230 | } | |
1231 | ||
1232 | sock_put(sk); | |
1233 | ||
1234 | return err; | |
1235 | } | |
1236 | ||
1237 | /* Main ioctl() handler. | |
1238 | * Dispatch to tunnel or session helpers depending on the socket. | |
1239 | */ | |
1240 | static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd, | |
1241 | unsigned long arg) | |
1242 | { | |
1243 | struct sock *sk = sock->sk; | |
1244 | struct l2tp_session *session; | |
1245 | struct l2tp_tunnel *tunnel; | |
1246 | struct pppol2tp_session *ps; | |
1247 | int err; | |
1248 | ||
1249 | if (!sk) | |
1250 | return 0; | |
1251 | ||
1252 | err = -EBADF; | |
1253 | if (sock_flag(sk, SOCK_DEAD) != 0) | |
1254 | goto end; | |
1255 | ||
1256 | err = -ENOTCONN; | |
1257 | if ((sk->sk_user_data == NULL) || | |
1258 | (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)))) | |
1259 | goto end; | |
1260 | ||
1261 | /* Get session context from the socket */ | |
1262 | err = -EBADF; | |
1263 | session = pppol2tp_sock_to_session(sk); | |
1264 | if (session == NULL) | |
1265 | goto end; | |
1266 | ||
1267 | /* Special case: if session's session_id is zero, treat ioctl as a | |
1268 | * tunnel ioctl | |
1269 | */ | |
1270 | ps = l2tp_session_priv(session); | |
1271 | if ((session->session_id == 0) && | |
1272 | (session->peer_session_id == 0)) { | |
1273 | err = -EBADF; | |
1274 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
1275 | if (tunnel == NULL) | |
1276 | goto end_put_sess; | |
1277 | ||
1278 | err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg); | |
1279 | sock_put(ps->tunnel_sock); | |
1280 | goto end_put_sess; | |
1281 | } | |
1282 | ||
1283 | err = pppol2tp_session_ioctl(session, cmd, arg); | |
1284 | ||
1285 | end_put_sess: | |
1286 | sock_put(sk); | |
1287 | end: | |
1288 | return err; | |
1289 | } | |
1290 | ||
1291 | /***************************************************************************** | |
1292 | * setsockopt() / getsockopt() support. | |
1293 | * | |
1294 | * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP | |
1295 | * sockets. In order to control kernel tunnel features, we allow userspace to | |
1296 | * create a special "tunnel" PPPoX socket which is used for control only. | |
1297 | * Tunnel PPPoX sockets have session_id == 0 and simply allow the user | |
1298 | * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls. | |
1299 | *****************************************************************************/ | |
1300 | ||
1301 | /* Tunnel setsockopt() helper. | |
1302 | */ | |
1303 | static int pppol2tp_tunnel_setsockopt(struct sock *sk, | |
1304 | struct l2tp_tunnel *tunnel, | |
1305 | int optname, int val) | |
1306 | { | |
1307 | int err = 0; | |
1308 | ||
1309 | switch (optname) { | |
1310 | case PPPOL2TP_SO_DEBUG: | |
1311 | tunnel->debug = val; | |
a4ca44fa JP |
1312 | l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: set debug=%x\n", |
1313 | tunnel->name, tunnel->debug); | |
fd558d18 JC |
1314 | break; |
1315 | ||
1316 | default: | |
1317 | err = -ENOPROTOOPT; | |
1318 | break; | |
1319 | } | |
1320 | ||
1321 | return err; | |
1322 | } | |
1323 | ||
1324 | /* Session setsockopt helper. | |
1325 | */ | |
1326 | static int pppol2tp_session_setsockopt(struct sock *sk, | |
1327 | struct l2tp_session *session, | |
1328 | int optname, int val) | |
1329 | { | |
1330 | int err = 0; | |
1331 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
1332 | ||
1333 | switch (optname) { | |
1334 | case PPPOL2TP_SO_RECVSEQ: | |
1335 | if ((val != 0) && (val != 1)) { | |
1336 | err = -EINVAL; | |
1337 | break; | |
1338 | } | |
1339 | session->recv_seq = val ? -1 : 0; | |
a4ca44fa JP |
1340 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, |
1341 | "%s: set recv_seq=%d\n", | |
1342 | session->name, session->recv_seq); | |
fd558d18 JC |
1343 | break; |
1344 | ||
1345 | case PPPOL2TP_SO_SENDSEQ: | |
1346 | if ((val != 0) && (val != 1)) { | |
1347 | err = -EINVAL; | |
1348 | break; | |
1349 | } | |
1350 | session->send_seq = val ? -1 : 0; | |
1351 | { | |
1352 | struct sock *ssk = ps->sock; | |
1353 | struct pppox_sock *po = pppox_sk(ssk); | |
1354 | po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ : | |
1355 | PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
1356 | } | |
a4ca44fa JP |
1357 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, |
1358 | "%s: set send_seq=%d\n", | |
1359 | session->name, session->send_seq); | |
fd558d18 JC |
1360 | break; |
1361 | ||
1362 | case PPPOL2TP_SO_LNSMODE: | |
1363 | if ((val != 0) && (val != 1)) { | |
1364 | err = -EINVAL; | |
1365 | break; | |
1366 | } | |
1367 | session->lns_mode = val ? -1 : 0; | |
a4ca44fa JP |
1368 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, |
1369 | "%s: set lns_mode=%d\n", | |
1370 | session->name, session->lns_mode); | |
fd558d18 JC |
1371 | break; |
1372 | ||
1373 | case PPPOL2TP_SO_DEBUG: | |
1374 | session->debug = val; | |
a4ca44fa JP |
1375 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set debug=%x\n", |
1376 | session->name, session->debug); | |
fd558d18 JC |
1377 | break; |
1378 | ||
1379 | case PPPOL2TP_SO_REORDERTO: | |
1380 | session->reorder_timeout = msecs_to_jiffies(val); | |
a4ca44fa JP |
1381 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, |
1382 | "%s: set reorder_timeout=%d\n", | |
1383 | session->name, session->reorder_timeout); | |
fd558d18 JC |
1384 | break; |
1385 | ||
1386 | default: | |
1387 | err = -ENOPROTOOPT; | |
1388 | break; | |
1389 | } | |
1390 | ||
1391 | return err; | |
1392 | } | |
1393 | ||
1394 | /* Main setsockopt() entry point. | |
1395 | * Does API checks, then calls either the tunnel or session setsockopt | |
1396 | * handler, according to whether the PPPoL2TP socket is a for a regular | |
1397 | * session or the special tunnel type. | |
1398 | */ | |
1399 | static int pppol2tp_setsockopt(struct socket *sock, int level, int optname, | |
1400 | char __user *optval, unsigned int optlen) | |
1401 | { | |
1402 | struct sock *sk = sock->sk; | |
1403 | struct l2tp_session *session; | |
1404 | struct l2tp_tunnel *tunnel; | |
1405 | struct pppol2tp_session *ps; | |
1406 | int val; | |
1407 | int err; | |
1408 | ||
1409 | if (level != SOL_PPPOL2TP) | |
1410 | return udp_prot.setsockopt(sk, level, optname, optval, optlen); | |
1411 | ||
1412 | if (optlen < sizeof(int)) | |
1413 | return -EINVAL; | |
1414 | ||
1415 | if (get_user(val, (int __user *)optval)) | |
1416 | return -EFAULT; | |
1417 | ||
1418 | err = -ENOTCONN; | |
1419 | if (sk->sk_user_data == NULL) | |
1420 | goto end; | |
1421 | ||
1422 | /* Get session context from the socket */ | |
1423 | err = -EBADF; | |
1424 | session = pppol2tp_sock_to_session(sk); | |
1425 | if (session == NULL) | |
1426 | goto end; | |
1427 | ||
1428 | /* Special case: if session_id == 0x0000, treat as operation on tunnel | |
1429 | */ | |
1430 | ps = l2tp_session_priv(session); | |
1431 | if ((session->session_id == 0) && | |
1432 | (session->peer_session_id == 0)) { | |
1433 | err = -EBADF; | |
1434 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
1435 | if (tunnel == NULL) | |
1436 | goto end_put_sess; | |
1437 | ||
1438 | err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val); | |
1439 | sock_put(ps->tunnel_sock); | |
1440 | } else | |
1441 | err = pppol2tp_session_setsockopt(sk, session, optname, val); | |
1442 | ||
1443 | err = 0; | |
1444 | ||
1445 | end_put_sess: | |
1446 | sock_put(sk); | |
1447 | end: | |
1448 | return err; | |
1449 | } | |
1450 | ||
1451 | /* Tunnel getsockopt helper. Called with sock locked. | |
1452 | */ | |
1453 | static int pppol2tp_tunnel_getsockopt(struct sock *sk, | |
1454 | struct l2tp_tunnel *tunnel, | |
1455 | int optname, int *val) | |
1456 | { | |
1457 | int err = 0; | |
1458 | ||
1459 | switch (optname) { | |
1460 | case PPPOL2TP_SO_DEBUG: | |
1461 | *val = tunnel->debug; | |
a4ca44fa JP |
1462 | l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: get debug=%x\n", |
1463 | tunnel->name, tunnel->debug); | |
fd558d18 JC |
1464 | break; |
1465 | ||
1466 | default: | |
1467 | err = -ENOPROTOOPT; | |
1468 | break; | |
1469 | } | |
1470 | ||
1471 | return err; | |
1472 | } | |
1473 | ||
1474 | /* Session getsockopt helper. Called with sock locked. | |
1475 | */ | |
1476 | static int pppol2tp_session_getsockopt(struct sock *sk, | |
1477 | struct l2tp_session *session, | |
1478 | int optname, int *val) | |
1479 | { | |
1480 | int err = 0; | |
1481 | ||
1482 | switch (optname) { | |
1483 | case PPPOL2TP_SO_RECVSEQ: | |
1484 | *val = session->recv_seq; | |
a4ca44fa JP |
1485 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, |
1486 | "%s: get recv_seq=%d\n", session->name, *val); | |
fd558d18 JC |
1487 | break; |
1488 | ||
1489 | case PPPOL2TP_SO_SENDSEQ: | |
1490 | *val = session->send_seq; | |
a4ca44fa JP |
1491 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, |
1492 | "%s: get send_seq=%d\n", session->name, *val); | |
fd558d18 JC |
1493 | break; |
1494 | ||
1495 | case PPPOL2TP_SO_LNSMODE: | |
1496 | *val = session->lns_mode; | |
a4ca44fa JP |
1497 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, |
1498 | "%s: get lns_mode=%d\n", session->name, *val); | |
fd558d18 JC |
1499 | break; |
1500 | ||
1501 | case PPPOL2TP_SO_DEBUG: | |
1502 | *val = session->debug; | |
a4ca44fa JP |
1503 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get debug=%d\n", |
1504 | session->name, *val); | |
fd558d18 JC |
1505 | break; |
1506 | ||
1507 | case PPPOL2TP_SO_REORDERTO: | |
1508 | *val = (int) jiffies_to_msecs(session->reorder_timeout); | |
a4ca44fa JP |
1509 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, |
1510 | "%s: get reorder_timeout=%d\n", session->name, *val); | |
fd558d18 JC |
1511 | break; |
1512 | ||
1513 | default: | |
1514 | err = -ENOPROTOOPT; | |
1515 | } | |
1516 | ||
1517 | return err; | |
1518 | } | |
1519 | ||
1520 | /* Main getsockopt() entry point. | |
1521 | * Does API checks, then calls either the tunnel or session getsockopt | |
1522 | * handler, according to whether the PPPoX socket is a for a regular session | |
1523 | * or the special tunnel type. | |
1524 | */ | |
1525 | static int pppol2tp_getsockopt(struct socket *sock, int level, | |
1526 | int optname, char __user *optval, int __user *optlen) | |
1527 | { | |
1528 | struct sock *sk = sock->sk; | |
1529 | struct l2tp_session *session; | |
1530 | struct l2tp_tunnel *tunnel; | |
1531 | int val, len; | |
1532 | int err; | |
1533 | struct pppol2tp_session *ps; | |
1534 | ||
1535 | if (level != SOL_PPPOL2TP) | |
1536 | return udp_prot.getsockopt(sk, level, optname, optval, optlen); | |
1537 | ||
1538 | if (get_user(len, (int __user *) optlen)) | |
1539 | return -EFAULT; | |
1540 | ||
1541 | len = min_t(unsigned int, len, sizeof(int)); | |
1542 | ||
1543 | if (len < 0) | |
1544 | return -EINVAL; | |
1545 | ||
1546 | err = -ENOTCONN; | |
1547 | if (sk->sk_user_data == NULL) | |
1548 | goto end; | |
1549 | ||
1550 | /* Get the session context */ | |
1551 | err = -EBADF; | |
1552 | session = pppol2tp_sock_to_session(sk); | |
1553 | if (session == NULL) | |
1554 | goto end; | |
1555 | ||
1556 | /* Special case: if session_id == 0x0000, treat as operation on tunnel */ | |
1557 | ps = l2tp_session_priv(session); | |
1558 | if ((session->session_id == 0) && | |
1559 | (session->peer_session_id == 0)) { | |
1560 | err = -EBADF; | |
1561 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
1562 | if (tunnel == NULL) | |
1563 | goto end_put_sess; | |
1564 | ||
1565 | err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val); | |
1566 | sock_put(ps->tunnel_sock); | |
1567 | } else | |
1568 | err = pppol2tp_session_getsockopt(sk, session, optname, &val); | |
1569 | ||
1570 | err = -EFAULT; | |
1571 | if (put_user(len, (int __user *) optlen)) | |
1572 | goto end_put_sess; | |
1573 | ||
1574 | if (copy_to_user((void __user *) optval, &val, len)) | |
1575 | goto end_put_sess; | |
1576 | ||
1577 | err = 0; | |
1578 | ||
1579 | end_put_sess: | |
1580 | sock_put(sk); | |
1581 | end: | |
1582 | return err; | |
1583 | } | |
1584 | ||
1585 | /***************************************************************************** | |
1586 | * /proc filesystem for debug | |
f7faffa3 JC |
1587 | * Since the original pppol2tp driver provided /proc/net/pppol2tp for |
1588 | * L2TPv2, we dump only L2TPv2 tunnels and sessions here. | |
fd558d18 JC |
1589 | *****************************************************************************/ |
1590 | ||
1591 | static unsigned int pppol2tp_net_id; | |
1592 | ||
1593 | #ifdef CONFIG_PROC_FS | |
1594 | ||
1595 | struct pppol2tp_seq_data { | |
1596 | struct seq_net_private p; | |
1597 | int tunnel_idx; /* current tunnel */ | |
1598 | int session_idx; /* index of session within current tunnel */ | |
1599 | struct l2tp_tunnel *tunnel; | |
1600 | struct l2tp_session *session; /* NULL means get next tunnel */ | |
1601 | }; | |
1602 | ||
1603 | static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd) | |
1604 | { | |
f7faffa3 JC |
1605 | for (;;) { |
1606 | pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx); | |
1607 | pd->tunnel_idx++; | |
1608 | ||
1609 | if (pd->tunnel == NULL) | |
1610 | break; | |
1611 | ||
1612 | /* Ignore L2TPv3 tunnels */ | |
1613 | if (pd->tunnel->version < 3) | |
1614 | break; | |
1615 | } | |
fd558d18 JC |
1616 | } |
1617 | ||
1618 | static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd) | |
1619 | { | |
1620 | pd->session = l2tp_session_find_nth(pd->tunnel, pd->session_idx); | |
1621 | pd->session_idx++; | |
f7faffa3 | 1622 | |
fd558d18 JC |
1623 | if (pd->session == NULL) { |
1624 | pd->session_idx = 0; | |
1625 | pppol2tp_next_tunnel(net, pd); | |
1626 | } | |
1627 | } | |
1628 | ||
1629 | static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs) | |
1630 | { | |
1631 | struct pppol2tp_seq_data *pd = SEQ_START_TOKEN; | |
1632 | loff_t pos = *offs; | |
1633 | struct net *net; | |
1634 | ||
1635 | if (!pos) | |
1636 | goto out; | |
1637 | ||
1638 | BUG_ON(m->private == NULL); | |
1639 | pd = m->private; | |
1640 | net = seq_file_net(m); | |
1641 | ||
1642 | if (pd->tunnel == NULL) | |
1643 | pppol2tp_next_tunnel(net, pd); | |
1644 | else | |
1645 | pppol2tp_next_session(net, pd); | |
1646 | ||
1647 | /* NULL tunnel and session indicates end of list */ | |
1648 | if ((pd->tunnel == NULL) && (pd->session == NULL)) | |
1649 | pd = NULL; | |
1650 | ||
1651 | out: | |
1652 | return pd; | |
1653 | } | |
1654 | ||
1655 | static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
1656 | { | |
1657 | (*pos)++; | |
1658 | return NULL; | |
1659 | } | |
1660 | ||
1661 | static void pppol2tp_seq_stop(struct seq_file *p, void *v) | |
1662 | { | |
1663 | /* nothing to do */ | |
1664 | } | |
1665 | ||
1666 | static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v) | |
1667 | { | |
1668 | struct l2tp_tunnel *tunnel = v; | |
1669 | ||
1670 | seq_printf(m, "\nTUNNEL '%s', %c %d\n", | |
1671 | tunnel->name, | |
1672 | (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N', | |
1673 | atomic_read(&tunnel->ref_count) - 1); | |
1674 | seq_printf(m, " %08x %llu/%llu/%llu %llu/%llu/%llu\n", | |
1675 | tunnel->debug, | |
1676 | (unsigned long long)tunnel->stats.tx_packets, | |
1677 | (unsigned long long)tunnel->stats.tx_bytes, | |
1678 | (unsigned long long)tunnel->stats.tx_errors, | |
1679 | (unsigned long long)tunnel->stats.rx_packets, | |
1680 | (unsigned long long)tunnel->stats.rx_bytes, | |
1681 | (unsigned long long)tunnel->stats.rx_errors); | |
1682 | } | |
1683 | ||
1684 | static void pppol2tp_seq_session_show(struct seq_file *m, void *v) | |
1685 | { | |
1686 | struct l2tp_session *session = v; | |
1687 | struct l2tp_tunnel *tunnel = session->tunnel; | |
1688 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
9345471b | 1689 | struct pppox_sock *po = pppox_sk(ps->sock); |
fd558d18 JC |
1690 | u32 ip = 0; |
1691 | u16 port = 0; | |
1692 | ||
1693 | if (tunnel->sock) { | |
1694 | struct inet_sock *inet = inet_sk(tunnel->sock); | |
1695 | ip = ntohl(inet->inet_saddr); | |
1696 | port = ntohs(inet->inet_sport); | |
1697 | } | |
1698 | ||
1699 | seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> " | |
1700 | "%04X/%04X %d %c\n", | |
1701 | session->name, ip, port, | |
1702 | tunnel->tunnel_id, | |
1703 | session->session_id, | |
1704 | tunnel->peer_tunnel_id, | |
1705 | session->peer_session_id, | |
1706 | ps->sock->sk_state, | |
1707 | (session == ps->sock->sk_user_data) ? | |
1708 | 'Y' : 'N'); | |
1709 | seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n", | |
1710 | session->mtu, session->mru, | |
1711 | session->recv_seq ? 'R' : '-', | |
1712 | session->send_seq ? 'S' : '-', | |
1713 | session->lns_mode ? "LNS" : "LAC", | |
1714 | session->debug, | |
1715 | jiffies_to_msecs(session->reorder_timeout)); | |
1716 | seq_printf(m, " %hu/%hu %llu/%llu/%llu %llu/%llu/%llu\n", | |
1717 | session->nr, session->ns, | |
1718 | (unsigned long long)session->stats.tx_packets, | |
1719 | (unsigned long long)session->stats.tx_bytes, | |
1720 | (unsigned long long)session->stats.tx_errors, | |
1721 | (unsigned long long)session->stats.rx_packets, | |
1722 | (unsigned long long)session->stats.rx_bytes, | |
1723 | (unsigned long long)session->stats.rx_errors); | |
9345471b JC |
1724 | |
1725 | if (po) | |
1726 | seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan)); | |
fd558d18 JC |
1727 | } |
1728 | ||
1729 | static int pppol2tp_seq_show(struct seq_file *m, void *v) | |
1730 | { | |
1731 | struct pppol2tp_seq_data *pd = v; | |
1732 | ||
1733 | /* display header on line 1 */ | |
1734 | if (v == SEQ_START_TOKEN) { | |
1735 | seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n"); | |
1736 | seq_puts(m, "TUNNEL name, user-data-ok session-count\n"); | |
1737 | seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
1738 | seq_puts(m, " SESSION name, addr/port src-tid/sid " | |
1739 | "dest-tid/sid state user-data-ok\n"); | |
1740 | seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n"); | |
1741 | seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
1742 | goto out; | |
1743 | } | |
1744 | ||
1745 | /* Show the tunnel or session context. | |
1746 | */ | |
1747 | if (pd->session == NULL) | |
1748 | pppol2tp_seq_tunnel_show(m, pd->tunnel); | |
1749 | else | |
1750 | pppol2tp_seq_session_show(m, pd->session); | |
1751 | ||
1752 | out: | |
1753 | return 0; | |
1754 | } | |
1755 | ||
1756 | static const struct seq_operations pppol2tp_seq_ops = { | |
1757 | .start = pppol2tp_seq_start, | |
1758 | .next = pppol2tp_seq_next, | |
1759 | .stop = pppol2tp_seq_stop, | |
1760 | .show = pppol2tp_seq_show, | |
1761 | }; | |
1762 | ||
1763 | /* Called when our /proc file is opened. We allocate data for use when | |
1764 | * iterating our tunnel / session contexts and store it in the private | |
1765 | * data of the seq_file. | |
1766 | */ | |
1767 | static int pppol2tp_proc_open(struct inode *inode, struct file *file) | |
1768 | { | |
1769 | return seq_open_net(inode, file, &pppol2tp_seq_ops, | |
1770 | sizeof(struct pppol2tp_seq_data)); | |
1771 | } | |
1772 | ||
1773 | static const struct file_operations pppol2tp_proc_fops = { | |
1774 | .owner = THIS_MODULE, | |
1775 | .open = pppol2tp_proc_open, | |
1776 | .read = seq_read, | |
1777 | .llseek = seq_lseek, | |
1778 | .release = seq_release_net, | |
1779 | }; | |
1780 | ||
1781 | #endif /* CONFIG_PROC_FS */ | |
1782 | ||
1783 | /***************************************************************************** | |
1784 | * Network namespace | |
1785 | *****************************************************************************/ | |
1786 | ||
1787 | static __net_init int pppol2tp_init_net(struct net *net) | |
1788 | { | |
1789 | struct proc_dir_entry *pde; | |
1790 | int err = 0; | |
1791 | ||
1792 | pde = proc_net_fops_create(net, "pppol2tp", S_IRUGO, &pppol2tp_proc_fops); | |
1793 | if (!pde) { | |
1794 | err = -ENOMEM; | |
1795 | goto out; | |
1796 | } | |
1797 | ||
1798 | out: | |
1799 | return err; | |
1800 | } | |
1801 | ||
1802 | static __net_exit void pppol2tp_exit_net(struct net *net) | |
1803 | { | |
1804 | proc_net_remove(net, "pppol2tp"); | |
1805 | } | |
1806 | ||
1807 | static struct pernet_operations pppol2tp_net_ops = { | |
1808 | .init = pppol2tp_init_net, | |
1809 | .exit = pppol2tp_exit_net, | |
1810 | .id = &pppol2tp_net_id, | |
1811 | }; | |
1812 | ||
1813 | /***************************************************************************** | |
1814 | * Init and cleanup | |
1815 | *****************************************************************************/ | |
1816 | ||
1817 | static const struct proto_ops pppol2tp_ops = { | |
1818 | .family = AF_PPPOX, | |
1819 | .owner = THIS_MODULE, | |
1820 | .release = pppol2tp_release, | |
1821 | .bind = sock_no_bind, | |
1822 | .connect = pppol2tp_connect, | |
1823 | .socketpair = sock_no_socketpair, | |
1824 | .accept = sock_no_accept, | |
1825 | .getname = pppol2tp_getname, | |
1826 | .poll = datagram_poll, | |
1827 | .listen = sock_no_listen, | |
1828 | .shutdown = sock_no_shutdown, | |
1829 | .setsockopt = pppol2tp_setsockopt, | |
1830 | .getsockopt = pppol2tp_getsockopt, | |
1831 | .sendmsg = pppol2tp_sendmsg, | |
1832 | .recvmsg = pppol2tp_recvmsg, | |
1833 | .mmap = sock_no_mmap, | |
1834 | .ioctl = pppox_ioctl, | |
1835 | }; | |
1836 | ||
756e64a0 | 1837 | static const struct pppox_proto pppol2tp_proto = { |
fd558d18 JC |
1838 | .create = pppol2tp_create, |
1839 | .ioctl = pppol2tp_ioctl | |
1840 | }; | |
1841 | ||
309795f4 JC |
1842 | #ifdef CONFIG_L2TP_V3 |
1843 | ||
1844 | static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = { | |
1845 | .session_create = pppol2tp_session_create, | |
1846 | .session_delete = pppol2tp_session_delete, | |
1847 | }; | |
1848 | ||
1849 | #endif /* CONFIG_L2TP_V3 */ | |
1850 | ||
fd558d18 JC |
1851 | static int __init pppol2tp_init(void) |
1852 | { | |
1853 | int err; | |
1854 | ||
1855 | err = register_pernet_device(&pppol2tp_net_ops); | |
1856 | if (err) | |
1857 | goto out; | |
1858 | ||
1859 | err = proto_register(&pppol2tp_sk_proto, 0); | |
1860 | if (err) | |
1861 | goto out_unregister_pppol2tp_pernet; | |
1862 | ||
1863 | err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto); | |
1864 | if (err) | |
1865 | goto out_unregister_pppol2tp_proto; | |
1866 | ||
309795f4 JC |
1867 | #ifdef CONFIG_L2TP_V3 |
1868 | err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops); | |
1869 | if (err) | |
1870 | goto out_unregister_pppox; | |
1871 | #endif | |
1872 | ||
a4ca44fa | 1873 | pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION); |
fd558d18 JC |
1874 | |
1875 | out: | |
1876 | return err; | |
309795f4 JC |
1877 | |
1878 | #ifdef CONFIG_L2TP_V3 | |
1879 | out_unregister_pppox: | |
1880 | unregister_pppox_proto(PX_PROTO_OL2TP); | |
1881 | #endif | |
fd558d18 JC |
1882 | out_unregister_pppol2tp_proto: |
1883 | proto_unregister(&pppol2tp_sk_proto); | |
1884 | out_unregister_pppol2tp_pernet: | |
1885 | unregister_pernet_device(&pppol2tp_net_ops); | |
1886 | goto out; | |
1887 | } | |
1888 | ||
1889 | static void __exit pppol2tp_exit(void) | |
1890 | { | |
309795f4 JC |
1891 | #ifdef CONFIG_L2TP_V3 |
1892 | l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP); | |
1893 | #endif | |
fd558d18 JC |
1894 | unregister_pppox_proto(PX_PROTO_OL2TP); |
1895 | proto_unregister(&pppol2tp_sk_proto); | |
1896 | unregister_pernet_device(&pppol2tp_net_ops); | |
1897 | } | |
1898 | ||
1899 | module_init(pppol2tp_init); | |
1900 | module_exit(pppol2tp_exit); | |
1901 | ||
1902 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); | |
1903 | MODULE_DESCRIPTION("PPP over L2TP over UDP"); | |
1904 | MODULE_LICENSE("GPL"); | |
1905 | MODULE_VERSION(PPPOL2TP_DRV_VERSION); | |
9395a09d | 1906 | MODULE_ALIAS("pppox-proto-" __stringify(PX_PROTO_OL2TP)); |