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fd558d18 JC |
1 | /***************************************************************************** |
2 | * Linux PPP over L2TP (PPPoX/PPPoL2TP) Sockets | |
3 | * | |
4 | * PPPoX --- Generic PPP encapsulation socket family | |
5 | * PPPoL2TP --- PPP over L2TP (RFC 2661) | |
6 | * | |
7 | * Version: 2.0.0 | |
8 | * | |
9 | * Authors: James Chapman (jchapman@katalix.com) | |
10 | * | |
11 | * Based on original work by Martijn van Oosterhout <kleptog@svana.org> | |
12 | * | |
13 | * License: | |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | * | |
19 | */ | |
20 | ||
21 | /* This driver handles only L2TP data frames; control frames are handled by a | |
22 | * userspace application. | |
23 | * | |
24 | * To send data in an L2TP session, userspace opens a PPPoL2TP socket and | |
25 | * attaches it to a bound UDP socket with local tunnel_id / session_id and | |
26 | * peer tunnel_id / session_id set. Data can then be sent or received using | |
27 | * regular socket sendmsg() / recvmsg() calls. Kernel parameters of the socket | |
28 | * can be read or modified using ioctl() or [gs]etsockopt() calls. | |
29 | * | |
30 | * When a PPPoL2TP socket is connected with local and peer session_id values | |
31 | * zero, the socket is treated as a special tunnel management socket. | |
32 | * | |
33 | * Here's example userspace code to create a socket for sending/receiving data | |
34 | * over an L2TP session:- | |
35 | * | |
36 | * struct sockaddr_pppol2tp sax; | |
37 | * int fd; | |
38 | * int session_fd; | |
39 | * | |
40 | * fd = socket(AF_PPPOX, SOCK_DGRAM, PX_PROTO_OL2TP); | |
41 | * | |
42 | * sax.sa_family = AF_PPPOX; | |
43 | * sax.sa_protocol = PX_PROTO_OL2TP; | |
44 | * sax.pppol2tp.fd = tunnel_fd; // bound UDP socket | |
45 | * sax.pppol2tp.addr.sin_addr.s_addr = addr->sin_addr.s_addr; | |
46 | * sax.pppol2tp.addr.sin_port = addr->sin_port; | |
47 | * sax.pppol2tp.addr.sin_family = AF_INET; | |
48 | * sax.pppol2tp.s_tunnel = tunnel_id; | |
49 | * sax.pppol2tp.s_session = session_id; | |
50 | * sax.pppol2tp.d_tunnel = peer_tunnel_id; | |
51 | * sax.pppol2tp.d_session = peer_session_id; | |
52 | * | |
53 | * session_fd = connect(fd, (struct sockaddr *)&sax, sizeof(sax)); | |
54 | * | |
55 | * A pppd plugin that allows PPP traffic to be carried over L2TP using | |
56 | * this driver is available from the OpenL2TP project at | |
57 | * http://openl2tp.sourceforge.net. | |
58 | */ | |
59 | ||
a4ca44fa JP |
60 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
61 | ||
fd558d18 JC |
62 | #include <linux/module.h> |
63 | #include <linux/string.h> | |
64 | #include <linux/list.h> | |
65 | #include <linux/uaccess.h> | |
66 | ||
67 | #include <linux/kernel.h> | |
68 | #include <linux/spinlock.h> | |
69 | #include <linux/kthread.h> | |
70 | #include <linux/sched.h> | |
71 | #include <linux/slab.h> | |
72 | #include <linux/errno.h> | |
73 | #include <linux/jiffies.h> | |
74 | ||
75 | #include <linux/netdevice.h> | |
76 | #include <linux/net.h> | |
77 | #include <linux/inetdevice.h> | |
78 | #include <linux/skbuff.h> | |
79 | #include <linux/init.h> | |
80 | #include <linux/ip.h> | |
81 | #include <linux/udp.h> | |
82 | #include <linux/if_pppox.h> | |
83 | #include <linux/if_pppol2tp.h> | |
84 | #include <net/sock.h> | |
85 | #include <linux/ppp_channel.h> | |
86 | #include <linux/ppp_defs.h> | |
4b32da2b | 87 | #include <linux/ppp-ioctl.h> |
fd558d18 JC |
88 | #include <linux/file.h> |
89 | #include <linux/hash.h> | |
90 | #include <linux/sort.h> | |
91 | #include <linux/proc_fs.h> | |
309795f4 | 92 | #include <linux/l2tp.h> |
fd558d18 JC |
93 | #include <linux/nsproxy.h> |
94 | #include <net/net_namespace.h> | |
95 | #include <net/netns/generic.h> | |
96 | #include <net/dst.h> | |
97 | #include <net/ip.h> | |
98 | #include <net/udp.h> | |
99 | #include <net/xfrm.h> | |
cf2f5c88 | 100 | #include <net/inet_common.h> |
fd558d18 JC |
101 | |
102 | #include <asm/byteorder.h> | |
60063497 | 103 | #include <linux/atomic.h> |
fd558d18 JC |
104 | |
105 | #include "l2tp_core.h" | |
106 | ||
107 | #define PPPOL2TP_DRV_VERSION "V2.0" | |
108 | ||
109 | /* Space for UDP, L2TP and PPP headers */ | |
110 | #define PPPOL2TP_HEADER_OVERHEAD 40 | |
111 | ||
fd558d18 JC |
112 | /* Number of bytes to build transmit L2TP headers. |
113 | * Unfortunately the size is different depending on whether sequence numbers | |
114 | * are enabled. | |
115 | */ | |
116 | #define PPPOL2TP_L2TP_HDR_SIZE_SEQ 10 | |
117 | #define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ 6 | |
118 | ||
119 | /* Private data of each session. This data lives at the end of struct | |
120 | * l2tp_session, referenced via session->priv[]. | |
121 | */ | |
122 | struct pppol2tp_session { | |
123 | int owner; /* pid that opened the socket */ | |
124 | ||
125 | struct sock *sock; /* Pointer to the session | |
126 | * PPPoX socket */ | |
127 | struct sock *tunnel_sock; /* Pointer to the tunnel UDP | |
128 | * socket */ | |
129 | int flags; /* accessed by PPPIOCGFLAGS. | |
130 | * Unused. */ | |
131 | }; | |
132 | ||
133 | static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb); | |
134 | ||
d7100da0 | 135 | static const struct ppp_channel_ops pppol2tp_chan_ops = { |
136 | .start_xmit = pppol2tp_xmit, | |
137 | }; | |
138 | ||
fd558d18 JC |
139 | static const struct proto_ops pppol2tp_ops; |
140 | ||
141 | /* Helpers to obtain tunnel/session contexts from sockets. | |
142 | */ | |
143 | static inline struct l2tp_session *pppol2tp_sock_to_session(struct sock *sk) | |
144 | { | |
145 | struct l2tp_session *session; | |
146 | ||
147 | if (sk == NULL) | |
148 | return NULL; | |
149 | ||
150 | sock_hold(sk); | |
151 | session = (struct l2tp_session *)(sk->sk_user_data); | |
152 | if (session == NULL) { | |
153 | sock_put(sk); | |
154 | goto out; | |
155 | } | |
156 | ||
157 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
158 | ||
159 | out: | |
160 | return session; | |
161 | } | |
162 | ||
163 | /***************************************************************************** | |
164 | * Receive data handling | |
165 | *****************************************************************************/ | |
166 | ||
167 | static int pppol2tp_recv_payload_hook(struct sk_buff *skb) | |
168 | { | |
169 | /* Skip PPP header, if present. In testing, Microsoft L2TP clients | |
170 | * don't send the PPP header (PPP header compression enabled), but | |
171 | * other clients can include the header. So we cope with both cases | |
172 | * here. The PPP header is always FF03 when using L2TP. | |
173 | * | |
174 | * Note that skb->data[] isn't dereferenced from a u16 ptr here since | |
175 | * the field may be unaligned. | |
176 | */ | |
177 | if (!pskb_may_pull(skb, 2)) | |
178 | return 1; | |
179 | ||
180 | if ((skb->data[0] == 0xff) && (skb->data[1] == 0x03)) | |
181 | skb_pull(skb, 2); | |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
186 | /* Receive message. This is the recvmsg for the PPPoL2TP socket. | |
187 | */ | |
188 | static int pppol2tp_recvmsg(struct kiocb *iocb, struct socket *sock, | |
189 | struct msghdr *msg, size_t len, | |
190 | int flags) | |
191 | { | |
192 | int err; | |
193 | struct sk_buff *skb; | |
194 | struct sock *sk = sock->sk; | |
195 | ||
196 | err = -EIO; | |
197 | if (sk->sk_state & PPPOX_BOUND) | |
198 | goto end; | |
199 | ||
fd558d18 JC |
200 | err = 0; |
201 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
202 | flags & MSG_DONTWAIT, &err); | |
203 | if (!skb) | |
204 | goto end; | |
205 | ||
206 | if (len > skb->len) | |
207 | len = skb->len; | |
208 | else if (len < skb->len) | |
209 | msg->msg_flags |= MSG_TRUNC; | |
210 | ||
211 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len); | |
212 | if (likely(err == 0)) | |
213 | err = len; | |
214 | ||
215 | kfree_skb(skb); | |
216 | end: | |
217 | return err; | |
218 | } | |
219 | ||
220 | static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len) | |
221 | { | |
222 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
223 | struct sock *sk = NULL; | |
224 | ||
225 | /* If the socket is bound, send it in to PPP's input queue. Otherwise | |
226 | * queue it on the session socket. | |
227 | */ | |
228 | sk = ps->sock; | |
229 | if (sk == NULL) | |
230 | goto no_sock; | |
231 | ||
232 | if (sk->sk_state & PPPOX_BOUND) { | |
233 | struct pppox_sock *po; | |
a4ca44fa JP |
234 | l2tp_dbg(session, PPPOL2TP_MSG_DATA, |
235 | "%s: recv %d byte data frame, passing to ppp\n", | |
236 | session->name, data_len); | |
fd558d18 JC |
237 | |
238 | /* We need to forget all info related to the L2TP packet | |
239 | * gathered in the skb as we are going to reuse the same | |
240 | * skb for the inner packet. | |
241 | * Namely we need to: | |
242 | * - reset xfrm (IPSec) information as it applies to | |
243 | * the outer L2TP packet and not to the inner one | |
244 | * - release the dst to force a route lookup on the inner | |
245 | * IP packet since skb->dst currently points to the dst | |
246 | * of the UDP tunnel | |
247 | * - reset netfilter information as it doesn't apply | |
248 | * to the inner packet either | |
249 | */ | |
250 | secpath_reset(skb); | |
251 | skb_dst_drop(skb); | |
252 | nf_reset(skb); | |
253 | ||
254 | po = pppox_sk(sk); | |
255 | ppp_input(&po->chan, skb); | |
256 | } else { | |
9e9cb622 GN |
257 | l2tp_dbg(session, PPPOL2TP_MSG_DATA, |
258 | "%s: recv %d byte data frame, passing to L2TP socket\n", | |
259 | session->name, data_len); | |
fd558d18 | 260 | |
9e9cb622 GN |
261 | if (sock_queue_rcv_skb(sk, skb) < 0) { |
262 | atomic_long_inc(&session->stats.rx_errors); | |
263 | kfree_skb(skb); | |
264 | } | |
fd558d18 JC |
265 | } |
266 | ||
267 | return; | |
268 | ||
269 | no_sock: | |
a4ca44fa | 270 | l2tp_info(session, PPPOL2TP_MSG_DATA, "%s: no socket\n", session->name); |
fd558d18 JC |
271 | kfree_skb(skb); |
272 | } | |
273 | ||
274 | static void pppol2tp_session_sock_hold(struct l2tp_session *session) | |
275 | { | |
276 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
277 | ||
278 | if (ps->sock) | |
279 | sock_hold(ps->sock); | |
280 | } | |
281 | ||
282 | static void pppol2tp_session_sock_put(struct l2tp_session *session) | |
283 | { | |
284 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
285 | ||
286 | if (ps->sock) | |
287 | sock_put(ps->sock); | |
288 | } | |
289 | ||
290 | /************************************************************************ | |
291 | * Transmit handling | |
292 | ***********************************************************************/ | |
293 | ||
fd558d18 JC |
294 | /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here |
295 | * when a user application does a sendmsg() on the session socket. L2TP and | |
296 | * PPP headers must be inserted into the user's data. | |
297 | */ | |
298 | static int pppol2tp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
299 | size_t total_len) | |
300 | { | |
301 | static const unsigned char ppph[2] = { 0xff, 0x03 }; | |
302 | struct sock *sk = sock->sk; | |
303 | struct sk_buff *skb; | |
304 | int error; | |
305 | struct l2tp_session *session; | |
306 | struct l2tp_tunnel *tunnel; | |
307 | struct pppol2tp_session *ps; | |
0d76751f | 308 | int uhlen; |
fd558d18 JC |
309 | |
310 | error = -ENOTCONN; | |
311 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
312 | goto error; | |
313 | ||
314 | /* Get session and tunnel contexts */ | |
315 | error = -EBADF; | |
316 | session = pppol2tp_sock_to_session(sk); | |
317 | if (session == NULL) | |
318 | goto error; | |
319 | ||
320 | ps = l2tp_session_priv(session); | |
321 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
322 | if (tunnel == NULL) | |
323 | goto error_put_sess; | |
324 | ||
0d76751f JC |
325 | uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0; |
326 | ||
fd558d18 JC |
327 | /* Allocate a socket buffer */ |
328 | error = -ENOMEM; | |
329 | skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) + | |
0d76751f | 330 | uhlen + session->hdr_len + |
fd558d18 JC |
331 | sizeof(ppph) + total_len, |
332 | 0, GFP_KERNEL); | |
333 | if (!skb) | |
334 | goto error_put_sess_tun; | |
335 | ||
336 | /* Reserve space for headers. */ | |
337 | skb_reserve(skb, NET_SKB_PAD); | |
338 | skb_reset_network_header(skb); | |
339 | skb_reserve(skb, sizeof(struct iphdr)); | |
340 | skb_reset_transport_header(skb); | |
0d76751f | 341 | skb_reserve(skb, uhlen); |
fd558d18 JC |
342 | |
343 | /* Add PPP header */ | |
344 | skb->data[0] = ppph[0]; | |
345 | skb->data[1] = ppph[1]; | |
346 | skb_put(skb, 2); | |
347 | ||
348 | /* Copy user data into skb */ | |
55b92b7a GN |
349 | error = memcpy_fromiovec(skb_put(skb, total_len), m->msg_iov, |
350 | total_len); | |
fd558d18 JC |
351 | if (error < 0) { |
352 | kfree_skb(skb); | |
353 | goto error_put_sess_tun; | |
354 | } | |
fd558d18 | 355 | |
455cc32b | 356 | local_bh_disable(); |
fd558d18 | 357 | l2tp_xmit_skb(session, skb, session->hdr_len); |
455cc32b | 358 | local_bh_enable(); |
fd558d18 JC |
359 | |
360 | sock_put(ps->tunnel_sock); | |
8b82547e | 361 | sock_put(sk); |
fd558d18 | 362 | |
a6f79d0f | 363 | return total_len; |
fd558d18 JC |
364 | |
365 | error_put_sess_tun: | |
366 | sock_put(ps->tunnel_sock); | |
367 | error_put_sess: | |
368 | sock_put(sk); | |
369 | error: | |
370 | return error; | |
371 | } | |
372 | ||
373 | /* Transmit function called by generic PPP driver. Sends PPP frame | |
374 | * over PPPoL2TP socket. | |
375 | * | |
376 | * This is almost the same as pppol2tp_sendmsg(), but rather than | |
377 | * being called with a msghdr from userspace, it is called with a skb | |
378 | * from the kernel. | |
379 | * | |
380 | * The supplied skb from ppp doesn't have enough headroom for the | |
381 | * insertion of L2TP, UDP and IP headers so we need to allocate more | |
382 | * headroom in the skb. This will create a cloned skb. But we must be | |
383 | * careful in the error case because the caller will expect to free | |
384 | * the skb it supplied, not our cloned skb. So we take care to always | |
385 | * leave the original skb unfreed if we return an error. | |
386 | */ | |
387 | static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb) | |
388 | { | |
389 | static const u8 ppph[2] = { 0xff, 0x03 }; | |
390 | struct sock *sk = (struct sock *) chan->private; | |
391 | struct sock *sk_tun; | |
fd558d18 JC |
392 | struct l2tp_session *session; |
393 | struct l2tp_tunnel *tunnel; | |
394 | struct pppol2tp_session *ps; | |
09df57ca | 395 | int uhlen, headroom; |
fd558d18 JC |
396 | |
397 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
398 | goto abort; | |
399 | ||
400 | /* Get session and tunnel contexts from the socket */ | |
401 | session = pppol2tp_sock_to_session(sk); | |
402 | if (session == NULL) | |
403 | goto abort; | |
404 | ||
405 | ps = l2tp_session_priv(session); | |
406 | sk_tun = ps->tunnel_sock; | |
407 | if (sk_tun == NULL) | |
408 | goto abort_put_sess; | |
409 | tunnel = l2tp_sock_to_tunnel(sk_tun); | |
410 | if (tunnel == NULL) | |
411 | goto abort_put_sess; | |
412 | ||
09df57ca ED |
413 | uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0; |
414 | headroom = NET_SKB_PAD + | |
415 | sizeof(struct iphdr) + /* IP header */ | |
416 | uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */ | |
417 | session->hdr_len + /* L2TP header */ | |
418 | sizeof(ppph); /* PPP header */ | |
419 | if (skb_cow_head(skb, headroom)) | |
fd558d18 JC |
420 | goto abort_put_sess_tun; |
421 | ||
fd558d18 JC |
422 | /* Setup PPP header */ |
423 | __skb_push(skb, sizeof(ppph)); | |
424 | skb->data[0] = ppph[0]; | |
425 | skb->data[1] = ppph[1]; | |
426 | ||
455cc32b | 427 | local_bh_disable(); |
e0d4435f | 428 | l2tp_xmit_skb(session, skb, session->hdr_len); |
455cc32b | 429 | local_bh_enable(); |
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; | |
cf2f5c88 | 455 | struct socket *sock = sk->sk_socket; |
fd558d18 JC |
456 | |
457 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
458 | ||
fd558d18 | 459 | |
cf2f5c88 TP |
460 | if (sock) { |
461 | inet_shutdown(sock, 2); | |
462 | /* Don't let the session go away before our socket does */ | |
463 | l2tp_session_inc_refcount(session); | |
fd558d18 | 464 | } |
fd558d18 JC |
465 | return; |
466 | } | |
467 | ||
468 | /* Really kill the session socket. (Called from sock_put() if | |
469 | * refcnt == 0.) | |
470 | */ | |
471 | static void pppol2tp_session_destruct(struct sock *sk) | |
472 | { | |
f6e16b29 TP |
473 | struct l2tp_session *session = sk->sk_user_data; |
474 | if (session) { | |
fd558d18 JC |
475 | sk->sk_user_data = NULL; |
476 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
477 | l2tp_session_dec_refcount(session); | |
478 | } | |
fd558d18 JC |
479 | return; |
480 | } | |
481 | ||
482 | /* Called when the PPPoX socket (session) is closed. | |
483 | */ | |
484 | static int pppol2tp_release(struct socket *sock) | |
485 | { | |
486 | struct sock *sk = sock->sk; | |
487 | struct l2tp_session *session; | |
488 | int error; | |
489 | ||
490 | if (!sk) | |
491 | return 0; | |
492 | ||
493 | error = -EBADF; | |
494 | lock_sock(sk); | |
495 | if (sock_flag(sk, SOCK_DEAD) != 0) | |
496 | goto error; | |
497 | ||
498 | pppox_unbind_sock(sk); | |
499 | ||
500 | /* Signal the death of the socket. */ | |
501 | sk->sk_state = PPPOX_DEAD; | |
502 | sock_orphan(sk); | |
503 | sock->sk = NULL; | |
504 | ||
505 | session = pppol2tp_sock_to_session(sk); | |
506 | ||
507 | /* Purge any queued data */ | |
fd558d18 | 508 | if (session != NULL) { |
f6e16b29 | 509 | __l2tp_session_unhash(session); |
cf2f5c88 | 510 | l2tp_session_queue_purge(session); |
fd558d18 JC |
511 | sock_put(sk); |
512 | } | |
cf2f5c88 TP |
513 | skb_queue_purge(&sk->sk_receive_queue); |
514 | skb_queue_purge(&sk->sk_write_queue); | |
fd558d18 JC |
515 | |
516 | release_sock(sk); | |
517 | ||
518 | /* This will delete the session context via | |
519 | * pppol2tp_session_destruct() if the socket's refcnt drops to | |
520 | * zero. | |
521 | */ | |
522 | sock_put(sk); | |
523 | ||
524 | return 0; | |
525 | ||
526 | error: | |
527 | release_sock(sk); | |
528 | return error; | |
529 | } | |
530 | ||
531 | static struct proto pppol2tp_sk_proto = { | |
532 | .name = "PPPOL2TP", | |
533 | .owner = THIS_MODULE, | |
534 | .obj_size = sizeof(struct pppox_sock), | |
535 | }; | |
536 | ||
537 | static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb) | |
538 | { | |
539 | int rc; | |
540 | ||
541 | rc = l2tp_udp_encap_recv(sk, skb); | |
542 | if (rc) | |
543 | kfree_skb(skb); | |
544 | ||
545 | return NET_RX_SUCCESS; | |
546 | } | |
547 | ||
548 | /* socket() handler. Initialize a new struct sock. | |
549 | */ | |
550 | static int pppol2tp_create(struct net *net, struct socket *sock) | |
551 | { | |
552 | int error = -ENOMEM; | |
553 | struct sock *sk; | |
554 | ||
555 | sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto); | |
556 | if (!sk) | |
557 | goto out; | |
558 | ||
559 | sock_init_data(sock, sk); | |
560 | ||
561 | sock->state = SS_UNCONNECTED; | |
562 | sock->ops = &pppol2tp_ops; | |
563 | ||
564 | sk->sk_backlog_rcv = pppol2tp_backlog_recv; | |
565 | sk->sk_protocol = PX_PROTO_OL2TP; | |
566 | sk->sk_family = PF_PPPOX; | |
567 | sk->sk_state = PPPOX_NONE; | |
568 | sk->sk_type = SOCK_STREAM; | |
569 | sk->sk_destruct = pppol2tp_session_destruct; | |
570 | ||
571 | error = 0; | |
572 | ||
573 | out: | |
574 | return error; | |
575 | } | |
576 | ||
f66ef2d0 | 577 | #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE) |
0ad66140 JC |
578 | static void pppol2tp_show(struct seq_file *m, void *arg) |
579 | { | |
580 | struct l2tp_session *session = arg; | |
581 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
582 | ||
583 | if (ps) { | |
584 | struct pppox_sock *po = pppox_sk(ps->sock); | |
585 | if (po) | |
586 | seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan)); | |
587 | } | |
588 | } | |
589 | #endif | |
590 | ||
fd558d18 JC |
591 | /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket |
592 | */ | |
593 | static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr, | |
594 | int sockaddr_len, int flags) | |
595 | { | |
596 | struct sock *sk = sock->sk; | |
597 | struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr; | |
598 | struct pppox_sock *po = pppox_sk(sk); | |
599 | struct l2tp_session *session = NULL; | |
600 | struct l2tp_tunnel *tunnel; | |
601 | struct pppol2tp_session *ps; | |
602 | struct dst_entry *dst; | |
603 | struct l2tp_session_cfg cfg = { 0, }; | |
604 | int error = 0; | |
e0d4435f JC |
605 | u32 tunnel_id, peer_tunnel_id; |
606 | u32 session_id, peer_session_id; | |
607 | int ver = 2; | |
608 | int fd; | |
fd558d18 JC |
609 | |
610 | lock_sock(sk); | |
611 | ||
612 | error = -EINVAL; | |
613 | if (sp->sa_protocol != PX_PROTO_OL2TP) | |
614 | goto end; | |
615 | ||
616 | /* Check for already bound sockets */ | |
617 | error = -EBUSY; | |
618 | if (sk->sk_state & PPPOX_CONNECTED) | |
619 | goto end; | |
620 | ||
621 | /* We don't supporting rebinding anyway */ | |
622 | error = -EALREADY; | |
623 | if (sk->sk_user_data) | |
624 | goto end; /* socket is already attached */ | |
625 | ||
b79585f5 JC |
626 | /* Get params from socket address. Handle L2TPv2 and L2TPv3. |
627 | * This is nasty because there are different sockaddr_pppol2tp | |
628 | * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use | |
629 | * the sockaddr size to determine which structure the caller | |
630 | * is using. | |
631 | */ | |
632 | peer_tunnel_id = 0; | |
e0d4435f JC |
633 | if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) { |
634 | fd = sp->pppol2tp.fd; | |
635 | tunnel_id = sp->pppol2tp.s_tunnel; | |
636 | peer_tunnel_id = sp->pppol2tp.d_tunnel; | |
637 | session_id = sp->pppol2tp.s_session; | |
638 | peer_session_id = sp->pppol2tp.d_session; | |
639 | } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) { | |
b79585f5 JC |
640 | struct sockaddr_pppol2tpv3 *sp3 = |
641 | (struct sockaddr_pppol2tpv3 *) sp; | |
e0d4435f JC |
642 | ver = 3; |
643 | fd = sp3->pppol2tp.fd; | |
644 | tunnel_id = sp3->pppol2tp.s_tunnel; | |
645 | peer_tunnel_id = sp3->pppol2tp.d_tunnel; | |
646 | session_id = sp3->pppol2tp.s_session; | |
647 | peer_session_id = sp3->pppol2tp.d_session; | |
b79585f5 JC |
648 | } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpin6)) { |
649 | struct sockaddr_pppol2tpin6 *sp6 = | |
650 | (struct sockaddr_pppol2tpin6 *) sp; | |
651 | fd = sp6->pppol2tp.fd; | |
652 | tunnel_id = sp6->pppol2tp.s_tunnel; | |
653 | peer_tunnel_id = sp6->pppol2tp.d_tunnel; | |
654 | session_id = sp6->pppol2tp.s_session; | |
655 | peer_session_id = sp6->pppol2tp.d_session; | |
656 | } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3in6)) { | |
657 | struct sockaddr_pppol2tpv3in6 *sp6 = | |
658 | (struct sockaddr_pppol2tpv3in6 *) sp; | |
659 | ver = 3; | |
660 | fd = sp6->pppol2tp.fd; | |
661 | tunnel_id = sp6->pppol2tp.s_tunnel; | |
662 | peer_tunnel_id = sp6->pppol2tp.d_tunnel; | |
663 | session_id = sp6->pppol2tp.s_session; | |
664 | peer_session_id = sp6->pppol2tp.d_session; | |
e0d4435f JC |
665 | } else { |
666 | error = -EINVAL; | |
667 | goto end; /* bad socket address */ | |
668 | } | |
669 | ||
670 | /* Don't bind if tunnel_id is 0 */ | |
fd558d18 | 671 | error = -EINVAL; |
e0d4435f | 672 | if (tunnel_id == 0) |
fd558d18 JC |
673 | goto end; |
674 | ||
309795f4 JC |
675 | tunnel = l2tp_tunnel_find(sock_net(sk), tunnel_id); |
676 | ||
e0d4435f JC |
677 | /* Special case: create tunnel context if session_id and |
678 | * peer_session_id is 0. Otherwise look up tunnel using supplied | |
fd558d18 JC |
679 | * tunnel id. |
680 | */ | |
e0d4435f | 681 | if ((session_id == 0) && (peer_session_id == 0)) { |
309795f4 JC |
682 | if (tunnel == NULL) { |
683 | struct l2tp_tunnel_cfg tcfg = { | |
684 | .encap = L2TP_ENCAPTYPE_UDP, | |
685 | .debug = 0, | |
686 | }; | |
687 | error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel); | |
688 | if (error < 0) | |
689 | goto end; | |
690 | } | |
fd558d18 | 691 | } else { |
fd558d18 JC |
692 | /* Error if we can't find the tunnel */ |
693 | error = -ENOENT; | |
694 | if (tunnel == NULL) | |
695 | goto end; | |
696 | ||
697 | /* Error if socket is not prepped */ | |
698 | if (tunnel->sock == NULL) | |
699 | goto end; | |
700 | } | |
701 | ||
702 | if (tunnel->recv_payload_hook == NULL) | |
703 | tunnel->recv_payload_hook = pppol2tp_recv_payload_hook; | |
704 | ||
b79585f5 JC |
705 | if (tunnel->peer_tunnel_id == 0) |
706 | tunnel->peer_tunnel_id = peer_tunnel_id; | |
fd558d18 | 707 | |
309795f4 JC |
708 | /* Create session if it doesn't already exist. We handle the |
709 | * case where a session was previously created by the netlink | |
710 | * interface by checking that the session doesn't already have | |
711 | * a socket and its tunnel socket are what we expect. If any | |
712 | * of those checks fail, return EEXIST to the caller. | |
713 | */ | |
714 | session = l2tp_session_find(sock_net(sk), tunnel, session_id); | |
fd558d18 | 715 | if (session == NULL) { |
309795f4 JC |
716 | /* Default MTU must allow space for UDP/L2TP/PPP |
717 | * headers. | |
718 | */ | |
719 | cfg.mtu = cfg.mru = 1500 - PPPOL2TP_HEADER_OVERHEAD; | |
720 | ||
721 | /* Allocate and initialize a new session context. */ | |
722 | session = l2tp_session_create(sizeof(struct pppol2tp_session), | |
723 | tunnel, session_id, | |
724 | peer_session_id, &cfg); | |
725 | if (session == NULL) { | |
726 | error = -ENOMEM; | |
727 | goto end; | |
728 | } | |
729 | } else { | |
730 | ps = l2tp_session_priv(session); | |
731 | error = -EEXIST; | |
732 | if (ps->sock != NULL) | |
733 | goto end; | |
734 | ||
735 | /* consistency checks */ | |
736 | if (ps->tunnel_sock != tunnel->sock) | |
737 | goto end; | |
fd558d18 JC |
738 | } |
739 | ||
309795f4 | 740 | /* Associate session with its PPPoL2TP socket */ |
fd558d18 JC |
741 | ps = l2tp_session_priv(session); |
742 | ps->owner = current->pid; | |
743 | ps->sock = sk; | |
744 | ps->tunnel_sock = tunnel->sock; | |
745 | ||
746 | session->recv_skb = pppol2tp_recv; | |
747 | session->session_close = pppol2tp_session_close; | |
f66ef2d0 | 748 | #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE) |
0ad66140 JC |
749 | session->show = pppol2tp_show; |
750 | #endif | |
fd558d18 JC |
751 | |
752 | /* We need to know each time a skb is dropped from the reorder | |
753 | * queue. | |
754 | */ | |
755 | session->ref = pppol2tp_session_sock_hold; | |
756 | session->deref = pppol2tp_session_sock_put; | |
757 | ||
758 | /* If PMTU discovery was enabled, use the MTU that was discovered */ | |
759 | dst = sk_dst_get(sk); | |
760 | if (dst != NULL) { | |
761 | u32 pmtu = dst_mtu(__sk_dst_get(sk)); | |
762 | if (pmtu != 0) | |
763 | session->mtu = session->mru = pmtu - | |
764 | PPPOL2TP_HEADER_OVERHEAD; | |
765 | dst_release(dst); | |
766 | } | |
767 | ||
768 | /* Special case: if source & dest session_id == 0x0000, this | |
769 | * socket is being created to manage the tunnel. Just set up | |
770 | * the internal context for use by ioctl() and sockopt() | |
771 | * handlers. | |
772 | */ | |
773 | if ((session->session_id == 0) && | |
774 | (session->peer_session_id == 0)) { | |
775 | error = 0; | |
776 | goto out_no_ppp; | |
777 | } | |
778 | ||
779 | /* The only header we need to worry about is the L2TP | |
780 | * header. This size is different depending on whether | |
781 | * sequence numbers are enabled for the data channel. | |
782 | */ | |
783 | po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
784 | ||
785 | po->chan.private = sk; | |
786 | po->chan.ops = &pppol2tp_chan_ops; | |
787 | po->chan.mtu = session->mtu; | |
788 | ||
789 | error = ppp_register_net_channel(sock_net(sk), &po->chan); | |
790 | if (error) | |
791 | goto end; | |
792 | ||
793 | out_no_ppp: | |
794 | /* This is how we get the session context from the socket. */ | |
795 | sk->sk_user_data = session; | |
796 | sk->sk_state = PPPOX_CONNECTED; | |
a4ca44fa JP |
797 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: created\n", |
798 | session->name); | |
fd558d18 JC |
799 | |
800 | end: | |
801 | release_sock(sk); | |
802 | ||
803 | return error; | |
804 | } | |
805 | ||
309795f4 JC |
806 | #ifdef CONFIG_L2TP_V3 |
807 | ||
808 | /* Called when creating sessions via the netlink interface. | |
809 | */ | |
810 | static int pppol2tp_session_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg) | |
811 | { | |
812 | int error; | |
813 | struct l2tp_tunnel *tunnel; | |
814 | struct l2tp_session *session; | |
815 | struct pppol2tp_session *ps; | |
816 | ||
817 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
818 | ||
819 | /* Error if we can't find the tunnel */ | |
820 | error = -ENOENT; | |
821 | if (tunnel == NULL) | |
822 | goto out; | |
823 | ||
824 | /* Error if tunnel socket is not prepped */ | |
825 | if (tunnel->sock == NULL) | |
826 | goto out; | |
827 | ||
828 | /* Check that this session doesn't already exist */ | |
829 | error = -EEXIST; | |
830 | session = l2tp_session_find(net, tunnel, session_id); | |
831 | if (session != NULL) | |
832 | goto out; | |
833 | ||
834 | /* Default MTU values. */ | |
835 | if (cfg->mtu == 0) | |
836 | cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD; | |
837 | if (cfg->mru == 0) | |
838 | cfg->mru = cfg->mtu; | |
839 | ||
840 | /* Allocate and initialize a new session context. */ | |
841 | error = -ENOMEM; | |
842 | session = l2tp_session_create(sizeof(struct pppol2tp_session), | |
843 | tunnel, session_id, | |
844 | peer_session_id, cfg); | |
845 | if (session == NULL) | |
846 | goto out; | |
847 | ||
848 | ps = l2tp_session_priv(session); | |
849 | ps->tunnel_sock = tunnel->sock; | |
850 | ||
a4ca44fa JP |
851 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: created\n", |
852 | session->name); | |
309795f4 JC |
853 | |
854 | error = 0; | |
855 | ||
856 | out: | |
857 | return error; | |
858 | } | |
859 | ||
309795f4 JC |
860 | #endif /* CONFIG_L2TP_V3 */ |
861 | ||
fd558d18 JC |
862 | /* getname() support. |
863 | */ | |
864 | static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr, | |
865 | int *usockaddr_len, int peer) | |
866 | { | |
e0d4435f | 867 | int len = 0; |
fd558d18 JC |
868 | int error = 0; |
869 | struct l2tp_session *session; | |
870 | struct l2tp_tunnel *tunnel; | |
871 | struct sock *sk = sock->sk; | |
872 | struct inet_sock *inet; | |
873 | struct pppol2tp_session *pls; | |
874 | ||
875 | error = -ENOTCONN; | |
876 | if (sk == NULL) | |
877 | goto end; | |
878 | if (sk->sk_state != PPPOX_CONNECTED) | |
879 | goto end; | |
880 | ||
881 | error = -EBADF; | |
882 | session = pppol2tp_sock_to_session(sk); | |
883 | if (session == NULL) | |
884 | goto end; | |
885 | ||
886 | pls = l2tp_session_priv(session); | |
887 | tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock); | |
888 | if (tunnel == NULL) { | |
889 | error = -EBADF; | |
890 | goto end_put_sess; | |
891 | } | |
892 | ||
bbdb32cb | 893 | inet = inet_sk(tunnel->sock); |
d2cf3361 | 894 | if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) { |
e0d4435f JC |
895 | struct sockaddr_pppol2tp sp; |
896 | len = sizeof(sp); | |
897 | memset(&sp, 0, len); | |
898 | sp.sa_family = AF_PPPOX; | |
899 | sp.sa_protocol = PX_PROTO_OL2TP; | |
900 | sp.pppol2tp.fd = tunnel->fd; | |
901 | sp.pppol2tp.pid = pls->owner; | |
902 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
903 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
904 | sp.pppol2tp.s_session = session->session_id; | |
905 | sp.pppol2tp.d_session = session->peer_session_id; | |
906 | sp.pppol2tp.addr.sin_family = AF_INET; | |
907 | sp.pppol2tp.addr.sin_port = inet->inet_dport; | |
908 | sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr; | |
909 | memcpy(uaddr, &sp, len); | |
d2cf3361 BL |
910 | #if IS_ENABLED(CONFIG_IPV6) |
911 | } else if ((tunnel->version == 2) && | |
912 | (tunnel->sock->sk_family == AF_INET6)) { | |
d2cf3361 | 913 | struct sockaddr_pppol2tpin6 sp; |
efe4208f | 914 | |
d2cf3361 BL |
915 | len = sizeof(sp); |
916 | memset(&sp, 0, len); | |
917 | sp.sa_family = AF_PPPOX; | |
918 | sp.sa_protocol = PX_PROTO_OL2TP; | |
919 | sp.pppol2tp.fd = tunnel->fd; | |
920 | sp.pppol2tp.pid = pls->owner; | |
921 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
922 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
923 | sp.pppol2tp.s_session = session->session_id; | |
924 | sp.pppol2tp.d_session = session->peer_session_id; | |
925 | sp.pppol2tp.addr.sin6_family = AF_INET6; | |
926 | sp.pppol2tp.addr.sin6_port = inet->inet_dport; | |
efe4208f ED |
927 | memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr, |
928 | sizeof(tunnel->sock->sk_v6_daddr)); | |
d2cf3361 BL |
929 | memcpy(uaddr, &sp, len); |
930 | } else if ((tunnel->version == 3) && | |
931 | (tunnel->sock->sk_family == AF_INET6)) { | |
d2cf3361 | 932 | struct sockaddr_pppol2tpv3in6 sp; |
efe4208f | 933 | |
d2cf3361 BL |
934 | len = sizeof(sp); |
935 | memset(&sp, 0, len); | |
936 | sp.sa_family = AF_PPPOX; | |
937 | sp.sa_protocol = PX_PROTO_OL2TP; | |
938 | sp.pppol2tp.fd = tunnel->fd; | |
939 | sp.pppol2tp.pid = pls->owner; | |
940 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
941 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
942 | sp.pppol2tp.s_session = session->session_id; | |
943 | sp.pppol2tp.d_session = session->peer_session_id; | |
944 | sp.pppol2tp.addr.sin6_family = AF_INET6; | |
945 | sp.pppol2tp.addr.sin6_port = inet->inet_dport; | |
efe4208f ED |
946 | memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr, |
947 | sizeof(tunnel->sock->sk_v6_daddr)); | |
d2cf3361 BL |
948 | memcpy(uaddr, &sp, len); |
949 | #endif | |
e0d4435f JC |
950 | } else if (tunnel->version == 3) { |
951 | struct sockaddr_pppol2tpv3 sp; | |
952 | len = sizeof(sp); | |
953 | memset(&sp, 0, len); | |
954 | sp.sa_family = AF_PPPOX; | |
955 | sp.sa_protocol = PX_PROTO_OL2TP; | |
956 | sp.pppol2tp.fd = tunnel->fd; | |
957 | sp.pppol2tp.pid = pls->owner; | |
958 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
959 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
960 | sp.pppol2tp.s_session = session->session_id; | |
961 | sp.pppol2tp.d_session = session->peer_session_id; | |
962 | sp.pppol2tp.addr.sin_family = AF_INET; | |
963 | sp.pppol2tp.addr.sin_port = inet->inet_dport; | |
964 | sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr; | |
965 | memcpy(uaddr, &sp, len); | |
966 | } | |
fd558d18 JC |
967 | |
968 | *usockaddr_len = len; | |
969 | ||
970 | sock_put(pls->tunnel_sock); | |
971 | end_put_sess: | |
972 | sock_put(sk); | |
973 | error = 0; | |
974 | ||
975 | end: | |
976 | return error; | |
977 | } | |
978 | ||
979 | /**************************************************************************** | |
980 | * ioctl() handlers. | |
981 | * | |
982 | * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP | |
983 | * sockets. However, in order to control kernel tunnel features, we allow | |
984 | * userspace to create a special "tunnel" PPPoX socket which is used for | |
985 | * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow | |
986 | * the user application to issue L2TP setsockopt(), getsockopt() and ioctl() | |
987 | * calls. | |
988 | ****************************************************************************/ | |
989 | ||
990 | static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest, | |
991 | struct l2tp_stats *stats) | |
992 | { | |
7b7c0719 TP |
993 | dest->tx_packets = atomic_long_read(&stats->tx_packets); |
994 | dest->tx_bytes = atomic_long_read(&stats->tx_bytes); | |
995 | dest->tx_errors = atomic_long_read(&stats->tx_errors); | |
996 | dest->rx_packets = atomic_long_read(&stats->rx_packets); | |
997 | dest->rx_bytes = atomic_long_read(&stats->rx_bytes); | |
998 | dest->rx_seq_discards = atomic_long_read(&stats->rx_seq_discards); | |
999 | dest->rx_oos_packets = atomic_long_read(&stats->rx_oos_packets); | |
1000 | dest->rx_errors = atomic_long_read(&stats->rx_errors); | |
fd558d18 JC |
1001 | } |
1002 | ||
1003 | /* Session ioctl helper. | |
1004 | */ | |
1005 | static int pppol2tp_session_ioctl(struct l2tp_session *session, | |
1006 | unsigned int cmd, unsigned long arg) | |
1007 | { | |
1008 | struct ifreq ifr; | |
1009 | int err = 0; | |
1010 | struct sock *sk; | |
1011 | int val = (int) arg; | |
1012 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
1013 | struct l2tp_tunnel *tunnel = session->tunnel; | |
1014 | struct pppol2tp_ioc_stats stats; | |
1015 | ||
a4ca44fa JP |
1016 | l2tp_dbg(session, PPPOL2TP_MSG_CONTROL, |
1017 | "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n", | |
1018 | session->name, cmd, arg); | |
fd558d18 JC |
1019 | |
1020 | sk = ps->sock; | |
1021 | sock_hold(sk); | |
1022 | ||
1023 | switch (cmd) { | |
1024 | case SIOCGIFMTU: | |
1025 | err = -ENXIO; | |
1026 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1027 | break; | |
1028 | ||
1029 | err = -EFAULT; | |
1030 | if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq))) | |
1031 | break; | |
1032 | ifr.ifr_mtu = session->mtu; | |
1033 | if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq))) | |
1034 | break; | |
1035 | ||
a4ca44fa JP |
1036 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get mtu=%d\n", |
1037 | session->name, session->mtu); | |
fd558d18 JC |
1038 | err = 0; |
1039 | break; | |
1040 | ||
1041 | case SIOCSIFMTU: | |
1042 | err = -ENXIO; | |
1043 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1044 | break; | |
1045 | ||
1046 | err = -EFAULT; | |
1047 | if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq))) | |
1048 | break; | |
1049 | ||
1050 | session->mtu = ifr.ifr_mtu; | |
1051 | ||
a4ca44fa JP |
1052 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set mtu=%d\n", |
1053 | session->name, session->mtu); | |
fd558d18 JC |
1054 | err = 0; |
1055 | break; | |
1056 | ||
1057 | case PPPIOCGMRU: | |
1058 | err = -ENXIO; | |
1059 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1060 | break; | |
1061 | ||
1062 | err = -EFAULT; | |
1063 | if (put_user(session->mru, (int __user *) arg)) | |
1064 | break; | |
1065 | ||
a4ca44fa JP |
1066 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get mru=%d\n", |
1067 | session->name, session->mru); | |
fd558d18 JC |
1068 | err = 0; |
1069 | break; | |
1070 | ||
1071 | case PPPIOCSMRU: | |
1072 | err = -ENXIO; | |
1073 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1074 | break; | |
1075 | ||
1076 | err = -EFAULT; | |
1077 | if (get_user(val, (int __user *) arg)) | |
1078 | break; | |
1079 | ||
1080 | session->mru = val; | |
a4ca44fa JP |
1081 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set mru=%d\n", |
1082 | session->name, session->mru); | |
fd558d18 JC |
1083 | err = 0; |
1084 | break; | |
1085 | ||
1086 | case PPPIOCGFLAGS: | |
1087 | err = -EFAULT; | |
1088 | if (put_user(ps->flags, (int __user *) arg)) | |
1089 | break; | |
1090 | ||
a4ca44fa JP |
1091 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get flags=%d\n", |
1092 | session->name, ps->flags); | |
fd558d18 JC |
1093 | err = 0; |
1094 | break; | |
1095 | ||
1096 | case PPPIOCSFLAGS: | |
1097 | err = -EFAULT; | |
1098 | if (get_user(val, (int __user *) arg)) | |
1099 | break; | |
1100 | ps->flags = val; | |
a4ca44fa JP |
1101 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set flags=%d\n", |
1102 | session->name, ps->flags); | |
fd558d18 JC |
1103 | err = 0; |
1104 | break; | |
1105 | ||
1106 | case PPPIOCGL2TPSTATS: | |
1107 | err = -ENXIO; | |
1108 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1109 | break; | |
1110 | ||
1111 | memset(&stats, 0, sizeof(stats)); | |
1112 | stats.tunnel_id = tunnel->tunnel_id; | |
1113 | stats.session_id = session->session_id; | |
1114 | pppol2tp_copy_stats(&stats, &session->stats); | |
1115 | if (copy_to_user((void __user *) arg, &stats, | |
1116 | sizeof(stats))) | |
1117 | break; | |
a4ca44fa JP |
1118 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get L2TP stats\n", |
1119 | session->name); | |
fd558d18 JC |
1120 | err = 0; |
1121 | break; | |
1122 | ||
1123 | default: | |
1124 | err = -ENOSYS; | |
1125 | break; | |
1126 | } | |
1127 | ||
1128 | sock_put(sk); | |
1129 | ||
1130 | return err; | |
1131 | } | |
1132 | ||
1133 | /* Tunnel ioctl helper. | |
1134 | * | |
1135 | * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data | |
1136 | * specifies a session_id, the session ioctl handler is called. This allows an | |
1137 | * application to retrieve session stats via a tunnel socket. | |
1138 | */ | |
1139 | static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel, | |
1140 | unsigned int cmd, unsigned long arg) | |
1141 | { | |
1142 | int err = 0; | |
1143 | struct sock *sk; | |
1144 | struct pppol2tp_ioc_stats stats; | |
1145 | ||
a4ca44fa JP |
1146 | l2tp_dbg(tunnel, PPPOL2TP_MSG_CONTROL, |
1147 | "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n", | |
1148 | tunnel->name, cmd, arg); | |
fd558d18 JC |
1149 | |
1150 | sk = tunnel->sock; | |
1151 | sock_hold(sk); | |
1152 | ||
1153 | switch (cmd) { | |
1154 | case PPPIOCGL2TPSTATS: | |
1155 | err = -ENXIO; | |
1156 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1157 | break; | |
1158 | ||
1159 | if (copy_from_user(&stats, (void __user *) arg, | |
1160 | sizeof(stats))) { | |
1161 | err = -EFAULT; | |
1162 | break; | |
1163 | } | |
1164 | if (stats.session_id != 0) { | |
1165 | /* resend to session ioctl handler */ | |
1166 | struct l2tp_session *session = | |
f7faffa3 | 1167 | l2tp_session_find(sock_net(sk), tunnel, stats.session_id); |
fd558d18 JC |
1168 | if (session != NULL) |
1169 | err = pppol2tp_session_ioctl(session, cmd, arg); | |
1170 | else | |
1171 | err = -EBADR; | |
1172 | break; | |
1173 | } | |
1174 | #ifdef CONFIG_XFRM | |
1175 | stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0; | |
1176 | #endif | |
1177 | pppol2tp_copy_stats(&stats, &tunnel->stats); | |
1178 | if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) { | |
1179 | err = -EFAULT; | |
1180 | break; | |
1181 | } | |
a4ca44fa JP |
1182 | l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: get L2TP stats\n", |
1183 | tunnel->name); | |
fd558d18 JC |
1184 | err = 0; |
1185 | break; | |
1186 | ||
1187 | default: | |
1188 | err = -ENOSYS; | |
1189 | break; | |
1190 | } | |
1191 | ||
1192 | sock_put(sk); | |
1193 | ||
1194 | return err; | |
1195 | } | |
1196 | ||
1197 | /* Main ioctl() handler. | |
1198 | * Dispatch to tunnel or session helpers depending on the socket. | |
1199 | */ | |
1200 | static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd, | |
1201 | unsigned long arg) | |
1202 | { | |
1203 | struct sock *sk = sock->sk; | |
1204 | struct l2tp_session *session; | |
1205 | struct l2tp_tunnel *tunnel; | |
1206 | struct pppol2tp_session *ps; | |
1207 | int err; | |
1208 | ||
1209 | if (!sk) | |
1210 | return 0; | |
1211 | ||
1212 | err = -EBADF; | |
1213 | if (sock_flag(sk, SOCK_DEAD) != 0) | |
1214 | goto end; | |
1215 | ||
1216 | err = -ENOTCONN; | |
1217 | if ((sk->sk_user_data == NULL) || | |
1218 | (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)))) | |
1219 | goto end; | |
1220 | ||
1221 | /* Get session context from the socket */ | |
1222 | err = -EBADF; | |
1223 | session = pppol2tp_sock_to_session(sk); | |
1224 | if (session == NULL) | |
1225 | goto end; | |
1226 | ||
1227 | /* Special case: if session's session_id is zero, treat ioctl as a | |
1228 | * tunnel ioctl | |
1229 | */ | |
1230 | ps = l2tp_session_priv(session); | |
1231 | if ((session->session_id == 0) && | |
1232 | (session->peer_session_id == 0)) { | |
1233 | err = -EBADF; | |
1234 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
1235 | if (tunnel == NULL) | |
1236 | goto end_put_sess; | |
1237 | ||
1238 | err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg); | |
1239 | sock_put(ps->tunnel_sock); | |
1240 | goto end_put_sess; | |
1241 | } | |
1242 | ||
1243 | err = pppol2tp_session_ioctl(session, cmd, arg); | |
1244 | ||
1245 | end_put_sess: | |
1246 | sock_put(sk); | |
1247 | end: | |
1248 | return err; | |
1249 | } | |
1250 | ||
1251 | /***************************************************************************** | |
1252 | * setsockopt() / getsockopt() support. | |
1253 | * | |
1254 | * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP | |
1255 | * sockets. In order to control kernel tunnel features, we allow userspace to | |
1256 | * create a special "tunnel" PPPoX socket which is used for control only. | |
1257 | * Tunnel PPPoX sockets have session_id == 0 and simply allow the user | |
1258 | * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls. | |
1259 | *****************************************************************************/ | |
1260 | ||
1261 | /* Tunnel setsockopt() helper. | |
1262 | */ | |
1263 | static int pppol2tp_tunnel_setsockopt(struct sock *sk, | |
1264 | struct l2tp_tunnel *tunnel, | |
1265 | int optname, int val) | |
1266 | { | |
1267 | int err = 0; | |
1268 | ||
1269 | switch (optname) { | |
1270 | case PPPOL2TP_SO_DEBUG: | |
1271 | tunnel->debug = val; | |
a4ca44fa JP |
1272 | l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: set debug=%x\n", |
1273 | tunnel->name, tunnel->debug); | |
fd558d18 JC |
1274 | break; |
1275 | ||
1276 | default: | |
1277 | err = -ENOPROTOOPT; | |
1278 | break; | |
1279 | } | |
1280 | ||
1281 | return err; | |
1282 | } | |
1283 | ||
1284 | /* Session setsockopt helper. | |
1285 | */ | |
1286 | static int pppol2tp_session_setsockopt(struct sock *sk, | |
1287 | struct l2tp_session *session, | |
1288 | int optname, int val) | |
1289 | { | |
1290 | int err = 0; | |
1291 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
1292 | ||
1293 | switch (optname) { | |
1294 | case PPPOL2TP_SO_RECVSEQ: | |
1295 | if ((val != 0) && (val != 1)) { | |
1296 | err = -EINVAL; | |
1297 | break; | |
1298 | } | |
1299 | session->recv_seq = val ? -1 : 0; | |
a4ca44fa JP |
1300 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, |
1301 | "%s: set recv_seq=%d\n", | |
1302 | session->name, session->recv_seq); | |
fd558d18 JC |
1303 | break; |
1304 | ||
1305 | case PPPOL2TP_SO_SENDSEQ: | |
1306 | if ((val != 0) && (val != 1)) { | |
1307 | err = -EINVAL; | |
1308 | break; | |
1309 | } | |
1310 | session->send_seq = val ? -1 : 0; | |
1311 | { | |
1312 | struct sock *ssk = ps->sock; | |
1313 | struct pppox_sock *po = pppox_sk(ssk); | |
1314 | po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ : | |
1315 | PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
1316 | } | |
bb5016ea | 1317 | l2tp_session_set_header_len(session, session->tunnel->version); |
a4ca44fa JP |
1318 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, |
1319 | "%s: set send_seq=%d\n", | |
1320 | session->name, session->send_seq); | |
fd558d18 JC |
1321 | break; |
1322 | ||
1323 | case PPPOL2TP_SO_LNSMODE: | |
1324 | if ((val != 0) && (val != 1)) { | |
1325 | err = -EINVAL; | |
1326 | break; | |
1327 | } | |
1328 | session->lns_mode = val ? -1 : 0; | |
a4ca44fa JP |
1329 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, |
1330 | "%s: set lns_mode=%d\n", | |
1331 | session->name, session->lns_mode); | |
fd558d18 JC |
1332 | break; |
1333 | ||
1334 | case PPPOL2TP_SO_DEBUG: | |
1335 | session->debug = val; | |
a4ca44fa JP |
1336 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set debug=%x\n", |
1337 | session->name, session->debug); | |
fd558d18 JC |
1338 | break; |
1339 | ||
1340 | case PPPOL2TP_SO_REORDERTO: | |
1341 | session->reorder_timeout = msecs_to_jiffies(val); | |
a4ca44fa JP |
1342 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, |
1343 | "%s: set reorder_timeout=%d\n", | |
1344 | session->name, session->reorder_timeout); | |
fd558d18 JC |
1345 | break; |
1346 | ||
1347 | default: | |
1348 | err = -ENOPROTOOPT; | |
1349 | break; | |
1350 | } | |
1351 | ||
1352 | return err; | |
1353 | } | |
1354 | ||
1355 | /* Main setsockopt() entry point. | |
1356 | * Does API checks, then calls either the tunnel or session setsockopt | |
1357 | * handler, according to whether the PPPoL2TP socket is a for a regular | |
1358 | * session or the special tunnel type. | |
1359 | */ | |
1360 | static int pppol2tp_setsockopt(struct socket *sock, int level, int optname, | |
1361 | char __user *optval, unsigned int optlen) | |
1362 | { | |
1363 | struct sock *sk = sock->sk; | |
1364 | struct l2tp_session *session; | |
1365 | struct l2tp_tunnel *tunnel; | |
1366 | struct pppol2tp_session *ps; | |
1367 | int val; | |
1368 | int err; | |
1369 | ||
1370 | if (level != SOL_PPPOL2TP) | |
1371 | return udp_prot.setsockopt(sk, level, optname, optval, optlen); | |
1372 | ||
1373 | if (optlen < sizeof(int)) | |
1374 | return -EINVAL; | |
1375 | ||
1376 | if (get_user(val, (int __user *)optval)) | |
1377 | return -EFAULT; | |
1378 | ||
1379 | err = -ENOTCONN; | |
1380 | if (sk->sk_user_data == NULL) | |
1381 | goto end; | |
1382 | ||
1383 | /* Get session context from the socket */ | |
1384 | err = -EBADF; | |
1385 | session = pppol2tp_sock_to_session(sk); | |
1386 | if (session == NULL) | |
1387 | goto end; | |
1388 | ||
1389 | /* Special case: if session_id == 0x0000, treat as operation on tunnel | |
1390 | */ | |
1391 | ps = l2tp_session_priv(session); | |
1392 | if ((session->session_id == 0) && | |
1393 | (session->peer_session_id == 0)) { | |
1394 | err = -EBADF; | |
1395 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
1396 | if (tunnel == NULL) | |
1397 | goto end_put_sess; | |
1398 | ||
1399 | err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val); | |
1400 | sock_put(ps->tunnel_sock); | |
1401 | } else | |
1402 | err = pppol2tp_session_setsockopt(sk, session, optname, val); | |
1403 | ||
1404 | err = 0; | |
1405 | ||
1406 | end_put_sess: | |
1407 | sock_put(sk); | |
1408 | end: | |
1409 | return err; | |
1410 | } | |
1411 | ||
1412 | /* Tunnel getsockopt helper. Called with sock locked. | |
1413 | */ | |
1414 | static int pppol2tp_tunnel_getsockopt(struct sock *sk, | |
1415 | struct l2tp_tunnel *tunnel, | |
1416 | int optname, int *val) | |
1417 | { | |
1418 | int err = 0; | |
1419 | ||
1420 | switch (optname) { | |
1421 | case PPPOL2TP_SO_DEBUG: | |
1422 | *val = tunnel->debug; | |
a4ca44fa JP |
1423 | l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: get debug=%x\n", |
1424 | tunnel->name, tunnel->debug); | |
fd558d18 JC |
1425 | break; |
1426 | ||
1427 | default: | |
1428 | err = -ENOPROTOOPT; | |
1429 | break; | |
1430 | } | |
1431 | ||
1432 | return err; | |
1433 | } | |
1434 | ||
1435 | /* Session getsockopt helper. Called with sock locked. | |
1436 | */ | |
1437 | static int pppol2tp_session_getsockopt(struct sock *sk, | |
1438 | struct l2tp_session *session, | |
1439 | int optname, int *val) | |
1440 | { | |
1441 | int err = 0; | |
1442 | ||
1443 | switch (optname) { | |
1444 | case PPPOL2TP_SO_RECVSEQ: | |
1445 | *val = session->recv_seq; | |
a4ca44fa JP |
1446 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, |
1447 | "%s: get recv_seq=%d\n", session->name, *val); | |
fd558d18 JC |
1448 | break; |
1449 | ||
1450 | case PPPOL2TP_SO_SENDSEQ: | |
1451 | *val = session->send_seq; | |
a4ca44fa JP |
1452 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, |
1453 | "%s: get send_seq=%d\n", session->name, *val); | |
fd558d18 JC |
1454 | break; |
1455 | ||
1456 | case PPPOL2TP_SO_LNSMODE: | |
1457 | *val = session->lns_mode; | |
a4ca44fa JP |
1458 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, |
1459 | "%s: get lns_mode=%d\n", session->name, *val); | |
fd558d18 JC |
1460 | break; |
1461 | ||
1462 | case PPPOL2TP_SO_DEBUG: | |
1463 | *val = session->debug; | |
a4ca44fa JP |
1464 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get debug=%d\n", |
1465 | session->name, *val); | |
fd558d18 JC |
1466 | break; |
1467 | ||
1468 | case PPPOL2TP_SO_REORDERTO: | |
1469 | *val = (int) jiffies_to_msecs(session->reorder_timeout); | |
a4ca44fa JP |
1470 | l2tp_info(session, PPPOL2TP_MSG_CONTROL, |
1471 | "%s: get reorder_timeout=%d\n", session->name, *val); | |
fd558d18 JC |
1472 | break; |
1473 | ||
1474 | default: | |
1475 | err = -ENOPROTOOPT; | |
1476 | } | |
1477 | ||
1478 | return err; | |
1479 | } | |
1480 | ||
1481 | /* Main getsockopt() entry point. | |
1482 | * Does API checks, then calls either the tunnel or session getsockopt | |
1483 | * handler, according to whether the PPPoX socket is a for a regular session | |
1484 | * or the special tunnel type. | |
1485 | */ | |
e3192690 JP |
1486 | static int pppol2tp_getsockopt(struct socket *sock, int level, int optname, |
1487 | char __user *optval, int __user *optlen) | |
fd558d18 JC |
1488 | { |
1489 | struct sock *sk = sock->sk; | |
1490 | struct l2tp_session *session; | |
1491 | struct l2tp_tunnel *tunnel; | |
1492 | int val, len; | |
1493 | int err; | |
1494 | struct pppol2tp_session *ps; | |
1495 | ||
1496 | if (level != SOL_PPPOL2TP) | |
1497 | return udp_prot.getsockopt(sk, level, optname, optval, optlen); | |
1498 | ||
e3192690 | 1499 | if (get_user(len, optlen)) |
fd558d18 JC |
1500 | return -EFAULT; |
1501 | ||
1502 | len = min_t(unsigned int, len, sizeof(int)); | |
1503 | ||
1504 | if (len < 0) | |
1505 | return -EINVAL; | |
1506 | ||
1507 | err = -ENOTCONN; | |
1508 | if (sk->sk_user_data == NULL) | |
1509 | goto end; | |
1510 | ||
1511 | /* Get the session context */ | |
1512 | err = -EBADF; | |
1513 | session = pppol2tp_sock_to_session(sk); | |
1514 | if (session == NULL) | |
1515 | goto end; | |
1516 | ||
1517 | /* Special case: if session_id == 0x0000, treat as operation on tunnel */ | |
1518 | ps = l2tp_session_priv(session); | |
1519 | if ((session->session_id == 0) && | |
1520 | (session->peer_session_id == 0)) { | |
1521 | err = -EBADF; | |
1522 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
1523 | if (tunnel == NULL) | |
1524 | goto end_put_sess; | |
1525 | ||
1526 | err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val); | |
1527 | sock_put(ps->tunnel_sock); | |
1528 | } else | |
1529 | err = pppol2tp_session_getsockopt(sk, session, optname, &val); | |
1530 | ||
1531 | err = -EFAULT; | |
e3192690 | 1532 | if (put_user(len, optlen)) |
fd558d18 JC |
1533 | goto end_put_sess; |
1534 | ||
1535 | if (copy_to_user((void __user *) optval, &val, len)) | |
1536 | goto end_put_sess; | |
1537 | ||
1538 | err = 0; | |
1539 | ||
1540 | end_put_sess: | |
1541 | sock_put(sk); | |
1542 | end: | |
1543 | return err; | |
1544 | } | |
1545 | ||
1546 | /***************************************************************************** | |
1547 | * /proc filesystem for debug | |
f7faffa3 JC |
1548 | * Since the original pppol2tp driver provided /proc/net/pppol2tp for |
1549 | * L2TPv2, we dump only L2TPv2 tunnels and sessions here. | |
fd558d18 JC |
1550 | *****************************************************************************/ |
1551 | ||
1552 | static unsigned int pppol2tp_net_id; | |
1553 | ||
1554 | #ifdef CONFIG_PROC_FS | |
1555 | ||
1556 | struct pppol2tp_seq_data { | |
1557 | struct seq_net_private p; | |
1558 | int tunnel_idx; /* current tunnel */ | |
1559 | int session_idx; /* index of session within current tunnel */ | |
1560 | struct l2tp_tunnel *tunnel; | |
1561 | struct l2tp_session *session; /* NULL means get next tunnel */ | |
1562 | }; | |
1563 | ||
1564 | static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd) | |
1565 | { | |
f7faffa3 JC |
1566 | for (;;) { |
1567 | pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx); | |
1568 | pd->tunnel_idx++; | |
1569 | ||
1570 | if (pd->tunnel == NULL) | |
1571 | break; | |
1572 | ||
1573 | /* Ignore L2TPv3 tunnels */ | |
1574 | if (pd->tunnel->version < 3) | |
1575 | break; | |
1576 | } | |
fd558d18 JC |
1577 | } |
1578 | ||
1579 | static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd) | |
1580 | { | |
1581 | pd->session = l2tp_session_find_nth(pd->tunnel, pd->session_idx); | |
1582 | pd->session_idx++; | |
f7faffa3 | 1583 | |
fd558d18 JC |
1584 | if (pd->session == NULL) { |
1585 | pd->session_idx = 0; | |
1586 | pppol2tp_next_tunnel(net, pd); | |
1587 | } | |
1588 | } | |
1589 | ||
1590 | static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs) | |
1591 | { | |
1592 | struct pppol2tp_seq_data *pd = SEQ_START_TOKEN; | |
1593 | loff_t pos = *offs; | |
1594 | struct net *net; | |
1595 | ||
1596 | if (!pos) | |
1597 | goto out; | |
1598 | ||
1599 | BUG_ON(m->private == NULL); | |
1600 | pd = m->private; | |
1601 | net = seq_file_net(m); | |
1602 | ||
1603 | if (pd->tunnel == NULL) | |
1604 | pppol2tp_next_tunnel(net, pd); | |
1605 | else | |
1606 | pppol2tp_next_session(net, pd); | |
1607 | ||
1608 | /* NULL tunnel and session indicates end of list */ | |
1609 | if ((pd->tunnel == NULL) && (pd->session == NULL)) | |
1610 | pd = NULL; | |
1611 | ||
1612 | out: | |
1613 | return pd; | |
1614 | } | |
1615 | ||
1616 | static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
1617 | { | |
1618 | (*pos)++; | |
1619 | return NULL; | |
1620 | } | |
1621 | ||
1622 | static void pppol2tp_seq_stop(struct seq_file *p, void *v) | |
1623 | { | |
1624 | /* nothing to do */ | |
1625 | } | |
1626 | ||
1627 | static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v) | |
1628 | { | |
1629 | struct l2tp_tunnel *tunnel = v; | |
1630 | ||
1631 | seq_printf(m, "\nTUNNEL '%s', %c %d\n", | |
1632 | tunnel->name, | |
1633 | (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N', | |
1634 | atomic_read(&tunnel->ref_count) - 1); | |
7b7c0719 | 1635 | seq_printf(m, " %08x %ld/%ld/%ld %ld/%ld/%ld\n", |
fd558d18 | 1636 | tunnel->debug, |
7b7c0719 TP |
1637 | atomic_long_read(&tunnel->stats.tx_packets), |
1638 | atomic_long_read(&tunnel->stats.tx_bytes), | |
1639 | atomic_long_read(&tunnel->stats.tx_errors), | |
1640 | atomic_long_read(&tunnel->stats.rx_packets), | |
1641 | atomic_long_read(&tunnel->stats.rx_bytes), | |
1642 | atomic_long_read(&tunnel->stats.rx_errors)); | |
fd558d18 JC |
1643 | } |
1644 | ||
1645 | static void pppol2tp_seq_session_show(struct seq_file *m, void *v) | |
1646 | { | |
1647 | struct l2tp_session *session = v; | |
1648 | struct l2tp_tunnel *tunnel = session->tunnel; | |
1649 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
9345471b | 1650 | struct pppox_sock *po = pppox_sk(ps->sock); |
fd558d18 JC |
1651 | u32 ip = 0; |
1652 | u16 port = 0; | |
1653 | ||
1654 | if (tunnel->sock) { | |
1655 | struct inet_sock *inet = inet_sk(tunnel->sock); | |
1656 | ip = ntohl(inet->inet_saddr); | |
1657 | port = ntohs(inet->inet_sport); | |
1658 | } | |
1659 | ||
1660 | seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> " | |
1661 | "%04X/%04X %d %c\n", | |
1662 | session->name, ip, port, | |
1663 | tunnel->tunnel_id, | |
1664 | session->session_id, | |
1665 | tunnel->peer_tunnel_id, | |
1666 | session->peer_session_id, | |
1667 | ps->sock->sk_state, | |
1668 | (session == ps->sock->sk_user_data) ? | |
1669 | 'Y' : 'N'); | |
1670 | seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n", | |
1671 | session->mtu, session->mru, | |
1672 | session->recv_seq ? 'R' : '-', | |
1673 | session->send_seq ? 'S' : '-', | |
1674 | session->lns_mode ? "LNS" : "LAC", | |
1675 | session->debug, | |
1676 | jiffies_to_msecs(session->reorder_timeout)); | |
7b7c0719 | 1677 | seq_printf(m, " %hu/%hu %ld/%ld/%ld %ld/%ld/%ld\n", |
fd558d18 | 1678 | session->nr, session->ns, |
7b7c0719 TP |
1679 | atomic_long_read(&session->stats.tx_packets), |
1680 | atomic_long_read(&session->stats.tx_bytes), | |
1681 | atomic_long_read(&session->stats.tx_errors), | |
1682 | atomic_long_read(&session->stats.rx_packets), | |
1683 | atomic_long_read(&session->stats.rx_bytes), | |
1684 | atomic_long_read(&session->stats.rx_errors)); | |
9345471b JC |
1685 | |
1686 | if (po) | |
1687 | seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan)); | |
fd558d18 JC |
1688 | } |
1689 | ||
1690 | static int pppol2tp_seq_show(struct seq_file *m, void *v) | |
1691 | { | |
1692 | struct pppol2tp_seq_data *pd = v; | |
1693 | ||
1694 | /* display header on line 1 */ | |
1695 | if (v == SEQ_START_TOKEN) { | |
1696 | seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n"); | |
1697 | seq_puts(m, "TUNNEL name, user-data-ok session-count\n"); | |
1698 | seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
1699 | seq_puts(m, " SESSION name, addr/port src-tid/sid " | |
1700 | "dest-tid/sid state user-data-ok\n"); | |
1701 | seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n"); | |
1702 | seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
1703 | goto out; | |
1704 | } | |
1705 | ||
1706 | /* Show the tunnel or session context. | |
1707 | */ | |
1708 | if (pd->session == NULL) | |
1709 | pppol2tp_seq_tunnel_show(m, pd->tunnel); | |
1710 | else | |
1711 | pppol2tp_seq_session_show(m, pd->session); | |
1712 | ||
1713 | out: | |
1714 | return 0; | |
1715 | } | |
1716 | ||
1717 | static const struct seq_operations pppol2tp_seq_ops = { | |
1718 | .start = pppol2tp_seq_start, | |
1719 | .next = pppol2tp_seq_next, | |
1720 | .stop = pppol2tp_seq_stop, | |
1721 | .show = pppol2tp_seq_show, | |
1722 | }; | |
1723 | ||
1724 | /* Called when our /proc file is opened. We allocate data for use when | |
1725 | * iterating our tunnel / session contexts and store it in the private | |
1726 | * data of the seq_file. | |
1727 | */ | |
1728 | static int pppol2tp_proc_open(struct inode *inode, struct file *file) | |
1729 | { | |
1730 | return seq_open_net(inode, file, &pppol2tp_seq_ops, | |
1731 | sizeof(struct pppol2tp_seq_data)); | |
1732 | } | |
1733 | ||
1734 | static const struct file_operations pppol2tp_proc_fops = { | |
1735 | .owner = THIS_MODULE, | |
1736 | .open = pppol2tp_proc_open, | |
1737 | .read = seq_read, | |
1738 | .llseek = seq_lseek, | |
1739 | .release = seq_release_net, | |
1740 | }; | |
1741 | ||
1742 | #endif /* CONFIG_PROC_FS */ | |
1743 | ||
1744 | /***************************************************************************** | |
1745 | * Network namespace | |
1746 | *****************************************************************************/ | |
1747 | ||
1748 | static __net_init int pppol2tp_init_net(struct net *net) | |
1749 | { | |
1750 | struct proc_dir_entry *pde; | |
1751 | int err = 0; | |
1752 | ||
d4beaa66 G |
1753 | pde = proc_create("pppol2tp", S_IRUGO, net->proc_net, |
1754 | &pppol2tp_proc_fops); | |
fd558d18 JC |
1755 | if (!pde) { |
1756 | err = -ENOMEM; | |
1757 | goto out; | |
1758 | } | |
1759 | ||
1760 | out: | |
1761 | return err; | |
1762 | } | |
1763 | ||
1764 | static __net_exit void pppol2tp_exit_net(struct net *net) | |
1765 | { | |
ece31ffd | 1766 | remove_proc_entry("pppol2tp", net->proc_net); |
fd558d18 JC |
1767 | } |
1768 | ||
1769 | static struct pernet_operations pppol2tp_net_ops = { | |
1770 | .init = pppol2tp_init_net, | |
1771 | .exit = pppol2tp_exit_net, | |
1772 | .id = &pppol2tp_net_id, | |
1773 | }; | |
1774 | ||
1775 | /***************************************************************************** | |
1776 | * Init and cleanup | |
1777 | *****************************************************************************/ | |
1778 | ||
1779 | static const struct proto_ops pppol2tp_ops = { | |
1780 | .family = AF_PPPOX, | |
1781 | .owner = THIS_MODULE, | |
1782 | .release = pppol2tp_release, | |
1783 | .bind = sock_no_bind, | |
1784 | .connect = pppol2tp_connect, | |
1785 | .socketpair = sock_no_socketpair, | |
1786 | .accept = sock_no_accept, | |
1787 | .getname = pppol2tp_getname, | |
1788 | .poll = datagram_poll, | |
1789 | .listen = sock_no_listen, | |
1790 | .shutdown = sock_no_shutdown, | |
1791 | .setsockopt = pppol2tp_setsockopt, | |
1792 | .getsockopt = pppol2tp_getsockopt, | |
1793 | .sendmsg = pppol2tp_sendmsg, | |
1794 | .recvmsg = pppol2tp_recvmsg, | |
1795 | .mmap = sock_no_mmap, | |
1796 | .ioctl = pppox_ioctl, | |
1797 | }; | |
1798 | ||
756e64a0 | 1799 | static const struct pppox_proto pppol2tp_proto = { |
fd558d18 | 1800 | .create = pppol2tp_create, |
e1558a93 WY |
1801 | .ioctl = pppol2tp_ioctl, |
1802 | .owner = THIS_MODULE, | |
fd558d18 JC |
1803 | }; |
1804 | ||
309795f4 JC |
1805 | #ifdef CONFIG_L2TP_V3 |
1806 | ||
1807 | static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = { | |
1808 | .session_create = pppol2tp_session_create, | |
cf2f5c88 | 1809 | .session_delete = l2tp_session_delete, |
309795f4 JC |
1810 | }; |
1811 | ||
1812 | #endif /* CONFIG_L2TP_V3 */ | |
1813 | ||
fd558d18 JC |
1814 | static int __init pppol2tp_init(void) |
1815 | { | |
1816 | int err; | |
1817 | ||
1818 | err = register_pernet_device(&pppol2tp_net_ops); | |
1819 | if (err) | |
1820 | goto out; | |
1821 | ||
1822 | err = proto_register(&pppol2tp_sk_proto, 0); | |
1823 | if (err) | |
1824 | goto out_unregister_pppol2tp_pernet; | |
1825 | ||
1826 | err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto); | |
1827 | if (err) | |
1828 | goto out_unregister_pppol2tp_proto; | |
1829 | ||
309795f4 JC |
1830 | #ifdef CONFIG_L2TP_V3 |
1831 | err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops); | |
1832 | if (err) | |
1833 | goto out_unregister_pppox; | |
1834 | #endif | |
1835 | ||
a4ca44fa | 1836 | pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION); |
fd558d18 JC |
1837 | |
1838 | out: | |
1839 | return err; | |
309795f4 JC |
1840 | |
1841 | #ifdef CONFIG_L2TP_V3 | |
1842 | out_unregister_pppox: | |
1843 | unregister_pppox_proto(PX_PROTO_OL2TP); | |
1844 | #endif | |
fd558d18 JC |
1845 | out_unregister_pppol2tp_proto: |
1846 | proto_unregister(&pppol2tp_sk_proto); | |
1847 | out_unregister_pppol2tp_pernet: | |
1848 | unregister_pernet_device(&pppol2tp_net_ops); | |
1849 | goto out; | |
1850 | } | |
1851 | ||
1852 | static void __exit pppol2tp_exit(void) | |
1853 | { | |
309795f4 JC |
1854 | #ifdef CONFIG_L2TP_V3 |
1855 | l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP); | |
1856 | #endif | |
fd558d18 JC |
1857 | unregister_pppox_proto(PX_PROTO_OL2TP); |
1858 | proto_unregister(&pppol2tp_sk_proto); | |
1859 | unregister_pernet_device(&pppol2tp_net_ops); | |
1860 | } | |
1861 | ||
1862 | module_init(pppol2tp_init); | |
1863 | module_exit(pppol2tp_exit); | |
1864 | ||
1865 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); | |
1866 | MODULE_DESCRIPTION("PPP over L2TP over UDP"); | |
1867 | MODULE_LICENSE("GPL"); | |
1868 | MODULE_VERSION(PPPOL2TP_DRV_VERSION); | |
9395a09d | 1869 | MODULE_ALIAS("pppox-proto-" __stringify(PX_PROTO_OL2TP)); |