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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 | ||
54c151d9 | 180 | if ((skb->data[0] == PPP_ALLSTATIONS) && (skb->data[1] == PPP_UI)) |
fd558d18 JC |
181 | skb_pull(skb, 2); |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
186 | /* Receive message. This is the recvmsg for the PPPoL2TP socket. | |
187 | */ | |
1b784140 YX |
188 | static int pppol2tp_recvmsg(struct socket *sock, struct msghdr *msg, |
189 | size_t len, int flags) | |
fd558d18 JC |
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 | ||
fd558d18 JC |
199 | err = 0; |
200 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
201 | flags & MSG_DONTWAIT, &err); | |
202 | if (!skb) | |
203 | goto end; | |
204 | ||
205 | if (len > skb->len) | |
206 | len = skb->len; | |
207 | else if (len < skb->len) | |
208 | msg->msg_flags |= MSG_TRUNC; | |
209 | ||
51f3d02b | 210 | err = skb_copy_datagram_msg(skb, 0, msg, len); |
fd558d18 JC |
211 | if (likely(err == 0)) |
212 | err = len; | |
213 | ||
214 | kfree_skb(skb); | |
215 | end: | |
216 | return err; | |
217 | } | |
218 | ||
219 | static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len) | |
220 | { | |
221 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
222 | struct sock *sk = NULL; | |
223 | ||
224 | /* If the socket is bound, send it in to PPP's input queue. Otherwise | |
225 | * queue it on the session socket. | |
226 | */ | |
227 | sk = ps->sock; | |
228 | if (sk == NULL) | |
229 | goto no_sock; | |
230 | ||
231 | if (sk->sk_state & PPPOX_BOUND) { | |
232 | struct pppox_sock *po; | |
98f40b3e | 233 | |
fba40c63 | 234 | l2tp_dbg(session, L2TP_MSG_DATA, |
a4ca44fa JP |
235 | "%s: recv %d byte data frame, passing to ppp\n", |
236 | session->name, data_len); | |
fd558d18 | 237 | |
fd558d18 JC |
238 | po = pppox_sk(sk); |
239 | ppp_input(&po->chan, skb); | |
240 | } else { | |
fba40c63 | 241 | l2tp_dbg(session, L2TP_MSG_DATA, |
9e9cb622 GN |
242 | "%s: recv %d byte data frame, passing to L2TP socket\n", |
243 | session->name, data_len); | |
fd558d18 | 244 | |
9e9cb622 GN |
245 | if (sock_queue_rcv_skb(sk, skb) < 0) { |
246 | atomic_long_inc(&session->stats.rx_errors); | |
247 | kfree_skb(skb); | |
248 | } | |
fd558d18 JC |
249 | } |
250 | ||
251 | return; | |
252 | ||
253 | no_sock: | |
fba40c63 | 254 | l2tp_info(session, L2TP_MSG_DATA, "%s: no socket\n", session->name); |
fd558d18 JC |
255 | kfree_skb(skb); |
256 | } | |
257 | ||
258 | static void pppol2tp_session_sock_hold(struct l2tp_session *session) | |
259 | { | |
260 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
261 | ||
262 | if (ps->sock) | |
263 | sock_hold(ps->sock); | |
264 | } | |
265 | ||
266 | static void pppol2tp_session_sock_put(struct l2tp_session *session) | |
267 | { | |
268 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
269 | ||
270 | if (ps->sock) | |
271 | sock_put(ps->sock); | |
272 | } | |
273 | ||
274 | /************************************************************************ | |
275 | * Transmit handling | |
276 | ***********************************************************************/ | |
277 | ||
fd558d18 JC |
278 | /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here |
279 | * when a user application does a sendmsg() on the session socket. L2TP and | |
280 | * PPP headers must be inserted into the user's data. | |
281 | */ | |
1b784140 | 282 | static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m, |
fd558d18 JC |
283 | size_t total_len) |
284 | { | |
fd558d18 JC |
285 | struct sock *sk = sock->sk; |
286 | struct sk_buff *skb; | |
287 | int error; | |
288 | struct l2tp_session *session; | |
289 | struct l2tp_tunnel *tunnel; | |
290 | struct pppol2tp_session *ps; | |
0d76751f | 291 | int uhlen; |
fd558d18 JC |
292 | |
293 | error = -ENOTCONN; | |
294 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
295 | goto error; | |
296 | ||
297 | /* Get session and tunnel contexts */ | |
298 | error = -EBADF; | |
299 | session = pppol2tp_sock_to_session(sk); | |
300 | if (session == NULL) | |
301 | goto error; | |
302 | ||
303 | ps = l2tp_session_priv(session); | |
304 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
305 | if (tunnel == NULL) | |
306 | goto error_put_sess; | |
307 | ||
0d76751f JC |
308 | uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0; |
309 | ||
fd558d18 JC |
310 | /* Allocate a socket buffer */ |
311 | error = -ENOMEM; | |
312 | skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) + | |
0d76751f | 313 | uhlen + session->hdr_len + |
54c151d9 | 314 | 2 + total_len, /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */ |
fd558d18 JC |
315 | 0, GFP_KERNEL); |
316 | if (!skb) | |
317 | goto error_put_sess_tun; | |
318 | ||
319 | /* Reserve space for headers. */ | |
320 | skb_reserve(skb, NET_SKB_PAD); | |
321 | skb_reset_network_header(skb); | |
322 | skb_reserve(skb, sizeof(struct iphdr)); | |
323 | skb_reset_transport_header(skb); | |
0d76751f | 324 | skb_reserve(skb, uhlen); |
fd558d18 JC |
325 | |
326 | /* Add PPP header */ | |
54c151d9 GF |
327 | skb->data[0] = PPP_ALLSTATIONS; |
328 | skb->data[1] = PPP_UI; | |
fd558d18 JC |
329 | skb_put(skb, 2); |
330 | ||
331 | /* Copy user data into skb */ | |
6ce8e9ce | 332 | error = memcpy_from_msg(skb_put(skb, total_len), m, total_len); |
fd558d18 JC |
333 | if (error < 0) { |
334 | kfree_skb(skb); | |
335 | goto error_put_sess_tun; | |
336 | } | |
fd558d18 | 337 | |
455cc32b | 338 | local_bh_disable(); |
fd558d18 | 339 | l2tp_xmit_skb(session, skb, session->hdr_len); |
455cc32b | 340 | local_bh_enable(); |
fd558d18 JC |
341 | |
342 | sock_put(ps->tunnel_sock); | |
8b82547e | 343 | sock_put(sk); |
fd558d18 | 344 | |
a6f79d0f | 345 | return total_len; |
fd558d18 JC |
346 | |
347 | error_put_sess_tun: | |
348 | sock_put(ps->tunnel_sock); | |
349 | error_put_sess: | |
350 | sock_put(sk); | |
351 | error: | |
352 | return error; | |
353 | } | |
354 | ||
355 | /* Transmit function called by generic PPP driver. Sends PPP frame | |
356 | * over PPPoL2TP socket. | |
357 | * | |
358 | * This is almost the same as pppol2tp_sendmsg(), but rather than | |
359 | * being called with a msghdr from userspace, it is called with a skb | |
360 | * from the kernel. | |
361 | * | |
362 | * The supplied skb from ppp doesn't have enough headroom for the | |
363 | * insertion of L2TP, UDP and IP headers so we need to allocate more | |
364 | * headroom in the skb. This will create a cloned skb. But we must be | |
365 | * careful in the error case because the caller will expect to free | |
366 | * the skb it supplied, not our cloned skb. So we take care to always | |
367 | * leave the original skb unfreed if we return an error. | |
368 | */ | |
369 | static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb) | |
370 | { | |
fd558d18 JC |
371 | struct sock *sk = (struct sock *) chan->private; |
372 | struct sock *sk_tun; | |
fd558d18 JC |
373 | struct l2tp_session *session; |
374 | struct l2tp_tunnel *tunnel; | |
375 | struct pppol2tp_session *ps; | |
09df57ca | 376 | int uhlen, headroom; |
fd558d18 JC |
377 | |
378 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
379 | goto abort; | |
380 | ||
381 | /* Get session and tunnel contexts from the socket */ | |
382 | session = pppol2tp_sock_to_session(sk); | |
383 | if (session == NULL) | |
384 | goto abort; | |
385 | ||
386 | ps = l2tp_session_priv(session); | |
387 | sk_tun = ps->tunnel_sock; | |
388 | if (sk_tun == NULL) | |
389 | goto abort_put_sess; | |
390 | tunnel = l2tp_sock_to_tunnel(sk_tun); | |
391 | if (tunnel == NULL) | |
392 | goto abort_put_sess; | |
393 | ||
09df57ca ED |
394 | uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0; |
395 | headroom = NET_SKB_PAD + | |
396 | sizeof(struct iphdr) + /* IP header */ | |
397 | uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */ | |
398 | session->hdr_len + /* L2TP header */ | |
54c151d9 | 399 | 2; /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */ |
09df57ca | 400 | if (skb_cow_head(skb, headroom)) |
fd558d18 JC |
401 | goto abort_put_sess_tun; |
402 | ||
fd558d18 | 403 | /* Setup PPP header */ |
54c151d9 GF |
404 | __skb_push(skb, 2); |
405 | skb->data[0] = PPP_ALLSTATIONS; | |
406 | skb->data[1] = PPP_UI; | |
fd558d18 | 407 | |
455cc32b | 408 | local_bh_disable(); |
e0d4435f | 409 | l2tp_xmit_skb(session, skb, session->hdr_len); |
455cc32b | 410 | local_bh_enable(); |
fd558d18 JC |
411 | |
412 | sock_put(sk_tun); | |
413 | sock_put(sk); | |
414 | return 1; | |
415 | ||
416 | abort_put_sess_tun: | |
417 | sock_put(sk_tun); | |
418 | abort_put_sess: | |
419 | sock_put(sk); | |
420 | abort: | |
421 | /* Free the original skb */ | |
422 | kfree_skb(skb); | |
423 | return 1; | |
424 | } | |
425 | ||
426 | /***************************************************************************** | |
427 | * Session (and tunnel control) socket create/destroy. | |
428 | *****************************************************************************/ | |
429 | ||
430 | /* Called by l2tp_core when a session socket is being closed. | |
431 | */ | |
432 | static void pppol2tp_session_close(struct l2tp_session *session) | |
433 | { | |
434 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
435 | struct sock *sk = ps->sock; | |
cf2f5c88 | 436 | struct socket *sock = sk->sk_socket; |
fd558d18 JC |
437 | |
438 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
439 | ||
cf2f5c88 | 440 | if (sock) { |
54c151d9 | 441 | inet_shutdown(sock, SEND_SHUTDOWN); |
cf2f5c88 TP |
442 | /* Don't let the session go away before our socket does */ |
443 | l2tp_session_inc_refcount(session); | |
fd558d18 | 444 | } |
fd558d18 JC |
445 | } |
446 | ||
447 | /* Really kill the session socket. (Called from sock_put() if | |
448 | * refcnt == 0.) | |
449 | */ | |
450 | static void pppol2tp_session_destruct(struct sock *sk) | |
451 | { | |
f6e16b29 | 452 | struct l2tp_session *session = sk->sk_user_data; |
e91793bb GN |
453 | |
454 | skb_queue_purge(&sk->sk_receive_queue); | |
455 | skb_queue_purge(&sk->sk_write_queue); | |
456 | ||
f6e16b29 | 457 | if (session) { |
fd558d18 JC |
458 | sk->sk_user_data = NULL; |
459 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
460 | l2tp_session_dec_refcount(session); | |
461 | } | |
fd558d18 JC |
462 | } |
463 | ||
464 | /* Called when the PPPoX socket (session) is closed. | |
465 | */ | |
466 | static int pppol2tp_release(struct socket *sock) | |
467 | { | |
468 | struct sock *sk = sock->sk; | |
469 | struct l2tp_session *session; | |
470 | int error; | |
471 | ||
472 | if (!sk) | |
473 | return 0; | |
474 | ||
475 | error = -EBADF; | |
476 | lock_sock(sk); | |
477 | if (sock_flag(sk, SOCK_DEAD) != 0) | |
478 | goto error; | |
479 | ||
480 | pppox_unbind_sock(sk); | |
481 | ||
482 | /* Signal the death of the socket. */ | |
483 | sk->sk_state = PPPOX_DEAD; | |
484 | sock_orphan(sk); | |
485 | sock->sk = NULL; | |
486 | ||
487 | session = pppol2tp_sock_to_session(sk); | |
488 | ||
489 | /* Purge any queued data */ | |
fd558d18 | 490 | if (session != NULL) { |
f6e16b29 | 491 | __l2tp_session_unhash(session); |
cf2f5c88 | 492 | l2tp_session_queue_purge(session); |
fd558d18 JC |
493 | sock_put(sk); |
494 | } | |
fd558d18 JC |
495 | release_sock(sk); |
496 | ||
497 | /* This will delete the session context via | |
498 | * pppol2tp_session_destruct() if the socket's refcnt drops to | |
499 | * zero. | |
500 | */ | |
501 | sock_put(sk); | |
502 | ||
503 | return 0; | |
504 | ||
505 | error: | |
506 | release_sock(sk); | |
507 | return error; | |
508 | } | |
509 | ||
510 | static struct proto pppol2tp_sk_proto = { | |
511 | .name = "PPPOL2TP", | |
512 | .owner = THIS_MODULE, | |
513 | .obj_size = sizeof(struct pppox_sock), | |
514 | }; | |
515 | ||
516 | static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb) | |
517 | { | |
518 | int rc; | |
519 | ||
520 | rc = l2tp_udp_encap_recv(sk, skb); | |
521 | if (rc) | |
522 | kfree_skb(skb); | |
523 | ||
524 | return NET_RX_SUCCESS; | |
525 | } | |
526 | ||
527 | /* socket() handler. Initialize a new struct sock. | |
528 | */ | |
11aa9c28 | 529 | static int pppol2tp_create(struct net *net, struct socket *sock, int kern) |
fd558d18 JC |
530 | { |
531 | int error = -ENOMEM; | |
532 | struct sock *sk; | |
533 | ||
11aa9c28 | 534 | sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto, kern); |
fd558d18 JC |
535 | if (!sk) |
536 | goto out; | |
537 | ||
538 | sock_init_data(sock, sk); | |
539 | ||
540 | sock->state = SS_UNCONNECTED; | |
541 | sock->ops = &pppol2tp_ops; | |
542 | ||
543 | sk->sk_backlog_rcv = pppol2tp_backlog_recv; | |
544 | sk->sk_protocol = PX_PROTO_OL2TP; | |
545 | sk->sk_family = PF_PPPOX; | |
546 | sk->sk_state = PPPOX_NONE; | |
547 | sk->sk_type = SOCK_STREAM; | |
548 | sk->sk_destruct = pppol2tp_session_destruct; | |
549 | ||
550 | error = 0; | |
551 | ||
552 | out: | |
553 | return error; | |
554 | } | |
555 | ||
9dd79945 | 556 | #if IS_ENABLED(CONFIG_L2TP_DEBUGFS) |
0ad66140 JC |
557 | static void pppol2tp_show(struct seq_file *m, void *arg) |
558 | { | |
559 | struct l2tp_session *session = arg; | |
560 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
561 | ||
562 | if (ps) { | |
563 | struct pppox_sock *po = pppox_sk(ps->sock); | |
564 | if (po) | |
565 | seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan)); | |
566 | } | |
567 | } | |
568 | #endif | |
569 | ||
fd558d18 JC |
570 | /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket |
571 | */ | |
572 | static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr, | |
573 | int sockaddr_len, int flags) | |
574 | { | |
575 | struct sock *sk = sock->sk; | |
576 | struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr; | |
577 | struct pppox_sock *po = pppox_sk(sk); | |
578 | struct l2tp_session *session = NULL; | |
579 | struct l2tp_tunnel *tunnel; | |
580 | struct pppol2tp_session *ps; | |
581 | struct dst_entry *dst; | |
582 | struct l2tp_session_cfg cfg = { 0, }; | |
583 | int error = 0; | |
e0d4435f JC |
584 | u32 tunnel_id, peer_tunnel_id; |
585 | u32 session_id, peer_session_id; | |
dbdbc73b | 586 | bool drop_refcnt = false; |
8b280b5c | 587 | bool drop_tunnel = false; |
e0d4435f JC |
588 | int ver = 2; |
589 | int fd; | |
fd558d18 JC |
590 | |
591 | lock_sock(sk); | |
592 | ||
593 | error = -EINVAL; | |
594 | if (sp->sa_protocol != PX_PROTO_OL2TP) | |
595 | goto end; | |
596 | ||
597 | /* Check for already bound sockets */ | |
598 | error = -EBUSY; | |
599 | if (sk->sk_state & PPPOX_CONNECTED) | |
600 | goto end; | |
601 | ||
602 | /* We don't supporting rebinding anyway */ | |
603 | error = -EALREADY; | |
604 | if (sk->sk_user_data) | |
605 | goto end; /* socket is already attached */ | |
606 | ||
b79585f5 JC |
607 | /* Get params from socket address. Handle L2TPv2 and L2TPv3. |
608 | * This is nasty because there are different sockaddr_pppol2tp | |
609 | * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use | |
610 | * the sockaddr size to determine which structure the caller | |
611 | * is using. | |
612 | */ | |
613 | peer_tunnel_id = 0; | |
e0d4435f JC |
614 | if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) { |
615 | fd = sp->pppol2tp.fd; | |
616 | tunnel_id = sp->pppol2tp.s_tunnel; | |
617 | peer_tunnel_id = sp->pppol2tp.d_tunnel; | |
618 | session_id = sp->pppol2tp.s_session; | |
619 | peer_session_id = sp->pppol2tp.d_session; | |
620 | } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) { | |
b79585f5 JC |
621 | struct sockaddr_pppol2tpv3 *sp3 = |
622 | (struct sockaddr_pppol2tpv3 *) sp; | |
e0d4435f JC |
623 | ver = 3; |
624 | fd = sp3->pppol2tp.fd; | |
625 | tunnel_id = sp3->pppol2tp.s_tunnel; | |
626 | peer_tunnel_id = sp3->pppol2tp.d_tunnel; | |
627 | session_id = sp3->pppol2tp.s_session; | |
628 | peer_session_id = sp3->pppol2tp.d_session; | |
b79585f5 JC |
629 | } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpin6)) { |
630 | struct sockaddr_pppol2tpin6 *sp6 = | |
631 | (struct sockaddr_pppol2tpin6 *) sp; | |
632 | fd = sp6->pppol2tp.fd; | |
633 | tunnel_id = sp6->pppol2tp.s_tunnel; | |
634 | peer_tunnel_id = sp6->pppol2tp.d_tunnel; | |
635 | session_id = sp6->pppol2tp.s_session; | |
636 | peer_session_id = sp6->pppol2tp.d_session; | |
637 | } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3in6)) { | |
638 | struct sockaddr_pppol2tpv3in6 *sp6 = | |
639 | (struct sockaddr_pppol2tpv3in6 *) sp; | |
640 | ver = 3; | |
641 | fd = sp6->pppol2tp.fd; | |
642 | tunnel_id = sp6->pppol2tp.s_tunnel; | |
643 | peer_tunnel_id = sp6->pppol2tp.d_tunnel; | |
644 | session_id = sp6->pppol2tp.s_session; | |
645 | peer_session_id = sp6->pppol2tp.d_session; | |
e0d4435f JC |
646 | } else { |
647 | error = -EINVAL; | |
648 | goto end; /* bad socket address */ | |
649 | } | |
650 | ||
651 | /* Don't bind if tunnel_id is 0 */ | |
fd558d18 | 652 | error = -EINVAL; |
e0d4435f | 653 | if (tunnel_id == 0) |
fd558d18 JC |
654 | goto end; |
655 | ||
8b280b5c GN |
656 | tunnel = l2tp_tunnel_get(sock_net(sk), tunnel_id); |
657 | if (tunnel) | |
658 | drop_tunnel = true; | |
309795f4 | 659 | |
e0d4435f JC |
660 | /* Special case: create tunnel context if session_id and |
661 | * peer_session_id is 0. Otherwise look up tunnel using supplied | |
fd558d18 JC |
662 | * tunnel id. |
663 | */ | |
e0d4435f | 664 | if ((session_id == 0) && (peer_session_id == 0)) { |
309795f4 JC |
665 | if (tunnel == NULL) { |
666 | struct l2tp_tunnel_cfg tcfg = { | |
667 | .encap = L2TP_ENCAPTYPE_UDP, | |
668 | .debug = 0, | |
669 | }; | |
670 | error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel); | |
671 | if (error < 0) | |
672 | goto end; | |
673 | } | |
fd558d18 | 674 | } else { |
fd558d18 JC |
675 | /* Error if we can't find the tunnel */ |
676 | error = -ENOENT; | |
677 | if (tunnel == NULL) | |
678 | goto end; | |
679 | ||
680 | /* Error if socket is not prepped */ | |
681 | if (tunnel->sock == NULL) | |
682 | goto end; | |
683 | } | |
684 | ||
685 | if (tunnel->recv_payload_hook == NULL) | |
686 | tunnel->recv_payload_hook = pppol2tp_recv_payload_hook; | |
687 | ||
b79585f5 JC |
688 | if (tunnel->peer_tunnel_id == 0) |
689 | tunnel->peer_tunnel_id = peer_tunnel_id; | |
fd558d18 | 690 | |
dbdbc73b GN |
691 | session = l2tp_session_get(sock_net(sk), tunnel, session_id, false); |
692 | if (session) { | |
693 | drop_refcnt = true; | |
694 | ps = l2tp_session_priv(session); | |
695 | ||
696 | /* Using a pre-existing session is fine as long as it hasn't | |
697 | * been connected yet. | |
309795f4 | 698 | */ |
dbdbc73b GN |
699 | if (ps->sock) { |
700 | error = -EEXIST; | |
701 | goto end; | |
702 | } | |
309795f4 | 703 | |
dbdbc73b GN |
704 | /* consistency checks */ |
705 | if (ps->tunnel_sock != tunnel->sock) { | |
706 | error = -EEXIST; | |
309795f4 JC |
707 | goto end; |
708 | } | |
709 | } else { | |
dbdbc73b GN |
710 | /* Default MTU must allow space for UDP/L2TP/PPP headers */ |
711 | cfg.mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD; | |
712 | cfg.mru = cfg.mtu; | |
309795f4 | 713 | |
dbdbc73b GN |
714 | session = l2tp_session_create(sizeof(struct pppol2tp_session), |
715 | tunnel, session_id, | |
716 | peer_session_id, &cfg); | |
717 | if (IS_ERR(session)) { | |
718 | error = PTR_ERR(session); | |
309795f4 | 719 | goto end; |
dbdbc73b | 720 | } |
fd558d18 JC |
721 | } |
722 | ||
309795f4 | 723 | /* Associate session with its PPPoL2TP socket */ |
fd558d18 JC |
724 | ps = l2tp_session_priv(session); |
725 | ps->owner = current->pid; | |
726 | ps->sock = sk; | |
727 | ps->tunnel_sock = tunnel->sock; | |
728 | ||
729 | session->recv_skb = pppol2tp_recv; | |
730 | session->session_close = pppol2tp_session_close; | |
9dd79945 | 731 | #if IS_ENABLED(CONFIG_L2TP_DEBUGFS) |
0ad66140 JC |
732 | session->show = pppol2tp_show; |
733 | #endif | |
fd558d18 JC |
734 | |
735 | /* We need to know each time a skb is dropped from the reorder | |
736 | * queue. | |
737 | */ | |
738 | session->ref = pppol2tp_session_sock_hold; | |
739 | session->deref = pppol2tp_session_sock_put; | |
740 | ||
741 | /* If PMTU discovery was enabled, use the MTU that was discovered */ | |
f34c4a35 | 742 | dst = sk_dst_get(tunnel->sock); |
fd558d18 | 743 | if (dst != NULL) { |
eed4d839 GN |
744 | u32 pmtu = dst_mtu(dst); |
745 | ||
fd558d18 JC |
746 | if (pmtu != 0) |
747 | session->mtu = session->mru = pmtu - | |
748 | PPPOL2TP_HEADER_OVERHEAD; | |
749 | dst_release(dst); | |
750 | } | |
751 | ||
752 | /* Special case: if source & dest session_id == 0x0000, this | |
753 | * socket is being created to manage the tunnel. Just set up | |
754 | * the internal context for use by ioctl() and sockopt() | |
755 | * handlers. | |
756 | */ | |
757 | if ((session->session_id == 0) && | |
758 | (session->peer_session_id == 0)) { | |
759 | error = 0; | |
760 | goto out_no_ppp; | |
761 | } | |
762 | ||
763 | /* The only header we need to worry about is the L2TP | |
764 | * header. This size is different depending on whether | |
765 | * sequence numbers are enabled for the data channel. | |
766 | */ | |
767 | po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
768 | ||
769 | po->chan.private = sk; | |
770 | po->chan.ops = &pppol2tp_chan_ops; | |
771 | po->chan.mtu = session->mtu; | |
772 | ||
773 | error = ppp_register_net_channel(sock_net(sk), &po->chan); | |
774 | if (error) | |
775 | goto end; | |
776 | ||
777 | out_no_ppp: | |
778 | /* This is how we get the session context from the socket. */ | |
779 | sk->sk_user_data = session; | |
780 | sk->sk_state = PPPOX_CONNECTED; | |
fba40c63 | 781 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: created\n", |
a4ca44fa | 782 | session->name); |
fd558d18 JC |
783 | |
784 | end: | |
dbdbc73b GN |
785 | if (drop_refcnt) |
786 | l2tp_session_dec_refcount(session); | |
8b280b5c GN |
787 | if (drop_tunnel) |
788 | l2tp_tunnel_dec_refcount(tunnel); | |
fd558d18 JC |
789 | release_sock(sk); |
790 | ||
791 | return error; | |
792 | } | |
793 | ||
309795f4 JC |
794 | #ifdef CONFIG_L2TP_V3 |
795 | ||
796 | /* Called when creating sessions via the netlink interface. | |
797 | */ | |
798 | static int pppol2tp_session_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg) | |
799 | { | |
800 | int error; | |
801 | struct l2tp_tunnel *tunnel; | |
802 | struct l2tp_session *session; | |
803 | struct pppol2tp_session *ps; | |
804 | ||
805 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
806 | ||
807 | /* Error if we can't find the tunnel */ | |
808 | error = -ENOENT; | |
809 | if (tunnel == NULL) | |
810 | goto out; | |
811 | ||
812 | /* Error if tunnel socket is not prepped */ | |
813 | if (tunnel->sock == NULL) | |
814 | goto out; | |
815 | ||
309795f4 JC |
816 | /* Default MTU values. */ |
817 | if (cfg->mtu == 0) | |
818 | cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD; | |
819 | if (cfg->mru == 0) | |
820 | cfg->mru = cfg->mtu; | |
821 | ||
822 | /* Allocate and initialize a new session context. */ | |
309795f4 JC |
823 | session = l2tp_session_create(sizeof(struct pppol2tp_session), |
824 | tunnel, session_id, | |
825 | peer_session_id, cfg); | |
dbdbc73b GN |
826 | if (IS_ERR(session)) { |
827 | error = PTR_ERR(session); | |
309795f4 | 828 | goto out; |
dbdbc73b | 829 | } |
309795f4 JC |
830 | |
831 | ps = l2tp_session_priv(session); | |
832 | ps->tunnel_sock = tunnel->sock; | |
833 | ||
fba40c63 | 834 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: created\n", |
a4ca44fa | 835 | session->name); |
309795f4 JC |
836 | |
837 | error = 0; | |
838 | ||
839 | out: | |
840 | return error; | |
841 | } | |
842 | ||
309795f4 JC |
843 | #endif /* CONFIG_L2TP_V3 */ |
844 | ||
fd558d18 JC |
845 | /* getname() support. |
846 | */ | |
847 | static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr, | |
848 | int *usockaddr_len, int peer) | |
849 | { | |
e0d4435f | 850 | int len = 0; |
fd558d18 JC |
851 | int error = 0; |
852 | struct l2tp_session *session; | |
853 | struct l2tp_tunnel *tunnel; | |
854 | struct sock *sk = sock->sk; | |
855 | struct inet_sock *inet; | |
856 | struct pppol2tp_session *pls; | |
857 | ||
858 | error = -ENOTCONN; | |
859 | if (sk == NULL) | |
860 | goto end; | |
56cff471 | 861 | if (!(sk->sk_state & PPPOX_CONNECTED)) |
fd558d18 JC |
862 | goto end; |
863 | ||
864 | error = -EBADF; | |
865 | session = pppol2tp_sock_to_session(sk); | |
866 | if (session == NULL) | |
867 | goto end; | |
868 | ||
869 | pls = l2tp_session_priv(session); | |
870 | tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock); | |
4ac36a4a | 871 | if (tunnel == NULL) |
fd558d18 | 872 | goto end_put_sess; |
fd558d18 | 873 | |
bbdb32cb | 874 | inet = inet_sk(tunnel->sock); |
d2cf3361 | 875 | if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) { |
e0d4435f JC |
876 | struct sockaddr_pppol2tp sp; |
877 | len = sizeof(sp); | |
878 | memset(&sp, 0, len); | |
879 | sp.sa_family = AF_PPPOX; | |
880 | sp.sa_protocol = PX_PROTO_OL2TP; | |
881 | sp.pppol2tp.fd = tunnel->fd; | |
882 | sp.pppol2tp.pid = pls->owner; | |
883 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
884 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
885 | sp.pppol2tp.s_session = session->session_id; | |
886 | sp.pppol2tp.d_session = session->peer_session_id; | |
887 | sp.pppol2tp.addr.sin_family = AF_INET; | |
888 | sp.pppol2tp.addr.sin_port = inet->inet_dport; | |
889 | sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr; | |
890 | memcpy(uaddr, &sp, len); | |
d2cf3361 BL |
891 | #if IS_ENABLED(CONFIG_IPV6) |
892 | } else if ((tunnel->version == 2) && | |
893 | (tunnel->sock->sk_family == AF_INET6)) { | |
d2cf3361 | 894 | struct sockaddr_pppol2tpin6 sp; |
efe4208f | 895 | |
d2cf3361 BL |
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.sin6_family = AF_INET6; | |
907 | sp.pppol2tp.addr.sin6_port = inet->inet_dport; | |
efe4208f ED |
908 | memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr, |
909 | sizeof(tunnel->sock->sk_v6_daddr)); | |
d2cf3361 BL |
910 | memcpy(uaddr, &sp, len); |
911 | } else if ((tunnel->version == 3) && | |
912 | (tunnel->sock->sk_family == AF_INET6)) { | |
d2cf3361 | 913 | struct sockaddr_pppol2tpv3in6 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 | #endif | |
e0d4435f JC |
931 | } else if (tunnel->version == 3) { |
932 | struct sockaddr_pppol2tpv3 sp; | |
933 | len = sizeof(sp); | |
934 | memset(&sp, 0, len); | |
935 | sp.sa_family = AF_PPPOX; | |
936 | sp.sa_protocol = PX_PROTO_OL2TP; | |
937 | sp.pppol2tp.fd = tunnel->fd; | |
938 | sp.pppol2tp.pid = pls->owner; | |
939 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
940 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
941 | sp.pppol2tp.s_session = session->session_id; | |
942 | sp.pppol2tp.d_session = session->peer_session_id; | |
943 | sp.pppol2tp.addr.sin_family = AF_INET; | |
944 | sp.pppol2tp.addr.sin_port = inet->inet_dport; | |
945 | sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr; | |
946 | memcpy(uaddr, &sp, len); | |
947 | } | |
fd558d18 JC |
948 | |
949 | *usockaddr_len = len; | |
4ac36a4a | 950 | error = 0; |
fd558d18 JC |
951 | |
952 | sock_put(pls->tunnel_sock); | |
953 | end_put_sess: | |
954 | sock_put(sk); | |
fd558d18 JC |
955 | end: |
956 | return error; | |
957 | } | |
958 | ||
959 | /**************************************************************************** | |
960 | * ioctl() handlers. | |
961 | * | |
962 | * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP | |
963 | * sockets. However, in order to control kernel tunnel features, we allow | |
964 | * userspace to create a special "tunnel" PPPoX socket which is used for | |
965 | * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow | |
966 | * the user application to issue L2TP setsockopt(), getsockopt() and ioctl() | |
967 | * calls. | |
968 | ****************************************************************************/ | |
969 | ||
970 | static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest, | |
971 | struct l2tp_stats *stats) | |
972 | { | |
7b7c0719 TP |
973 | dest->tx_packets = atomic_long_read(&stats->tx_packets); |
974 | dest->tx_bytes = atomic_long_read(&stats->tx_bytes); | |
975 | dest->tx_errors = atomic_long_read(&stats->tx_errors); | |
976 | dest->rx_packets = atomic_long_read(&stats->rx_packets); | |
977 | dest->rx_bytes = atomic_long_read(&stats->rx_bytes); | |
978 | dest->rx_seq_discards = atomic_long_read(&stats->rx_seq_discards); | |
979 | dest->rx_oos_packets = atomic_long_read(&stats->rx_oos_packets); | |
980 | dest->rx_errors = atomic_long_read(&stats->rx_errors); | |
fd558d18 JC |
981 | } |
982 | ||
983 | /* Session ioctl helper. | |
984 | */ | |
985 | static int pppol2tp_session_ioctl(struct l2tp_session *session, | |
986 | unsigned int cmd, unsigned long arg) | |
987 | { | |
988 | struct ifreq ifr; | |
989 | int err = 0; | |
990 | struct sock *sk; | |
991 | int val = (int) arg; | |
992 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
993 | struct l2tp_tunnel *tunnel = session->tunnel; | |
994 | struct pppol2tp_ioc_stats stats; | |
995 | ||
fba40c63 | 996 | l2tp_dbg(session, L2TP_MSG_CONTROL, |
a4ca44fa JP |
997 | "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n", |
998 | session->name, cmd, arg); | |
fd558d18 JC |
999 | |
1000 | sk = ps->sock; | |
651465ff GN |
1001 | if (!sk) |
1002 | return -EBADR; | |
1003 | ||
fd558d18 JC |
1004 | sock_hold(sk); |
1005 | ||
1006 | switch (cmd) { | |
1007 | case SIOCGIFMTU: | |
1008 | err = -ENXIO; | |
1009 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1010 | break; | |
1011 | ||
1012 | err = -EFAULT; | |
1013 | if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq))) | |
1014 | break; | |
1015 | ifr.ifr_mtu = session->mtu; | |
1016 | if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq))) | |
1017 | break; | |
1018 | ||
fba40c63 | 1019 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mtu=%d\n", |
a4ca44fa | 1020 | session->name, session->mtu); |
fd558d18 JC |
1021 | err = 0; |
1022 | break; | |
1023 | ||
1024 | case SIOCSIFMTU: | |
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 | ||
1033 | session->mtu = ifr.ifr_mtu; | |
1034 | ||
fba40c63 | 1035 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mtu=%d\n", |
a4ca44fa | 1036 | session->name, session->mtu); |
fd558d18 JC |
1037 | err = 0; |
1038 | break; | |
1039 | ||
1040 | case PPPIOCGMRU: | |
1041 | err = -ENXIO; | |
1042 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1043 | break; | |
1044 | ||
1045 | err = -EFAULT; | |
1046 | if (put_user(session->mru, (int __user *) arg)) | |
1047 | break; | |
1048 | ||
fba40c63 | 1049 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mru=%d\n", |
a4ca44fa | 1050 | session->name, session->mru); |
fd558d18 JC |
1051 | err = 0; |
1052 | break; | |
1053 | ||
1054 | case PPPIOCSMRU: | |
1055 | err = -ENXIO; | |
1056 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1057 | break; | |
1058 | ||
1059 | err = -EFAULT; | |
1060 | if (get_user(val, (int __user *) arg)) | |
1061 | break; | |
1062 | ||
1063 | session->mru = val; | |
fba40c63 | 1064 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mru=%d\n", |
a4ca44fa | 1065 | session->name, session->mru); |
fd558d18 JC |
1066 | err = 0; |
1067 | break; | |
1068 | ||
1069 | case PPPIOCGFLAGS: | |
1070 | err = -EFAULT; | |
1071 | if (put_user(ps->flags, (int __user *) arg)) | |
1072 | break; | |
1073 | ||
fba40c63 | 1074 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: get flags=%d\n", |
a4ca44fa | 1075 | session->name, ps->flags); |
fd558d18 JC |
1076 | err = 0; |
1077 | break; | |
1078 | ||
1079 | case PPPIOCSFLAGS: | |
1080 | err = -EFAULT; | |
1081 | if (get_user(val, (int __user *) arg)) | |
1082 | break; | |
1083 | ps->flags = val; | |
fba40c63 | 1084 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: set flags=%d\n", |
a4ca44fa | 1085 | session->name, ps->flags); |
fd558d18 JC |
1086 | err = 0; |
1087 | break; | |
1088 | ||
1089 | case PPPIOCGL2TPSTATS: | |
1090 | err = -ENXIO; | |
1091 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1092 | break; | |
1093 | ||
1094 | memset(&stats, 0, sizeof(stats)); | |
1095 | stats.tunnel_id = tunnel->tunnel_id; | |
1096 | stats.session_id = session->session_id; | |
1097 | pppol2tp_copy_stats(&stats, &session->stats); | |
1098 | if (copy_to_user((void __user *) arg, &stats, | |
1099 | sizeof(stats))) | |
1100 | break; | |
fba40c63 | 1101 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: get L2TP stats\n", |
a4ca44fa | 1102 | session->name); |
fd558d18 JC |
1103 | err = 0; |
1104 | break; | |
1105 | ||
1106 | default: | |
1107 | err = -ENOSYS; | |
1108 | break; | |
1109 | } | |
1110 | ||
1111 | sock_put(sk); | |
1112 | ||
1113 | return err; | |
1114 | } | |
1115 | ||
1116 | /* Tunnel ioctl helper. | |
1117 | * | |
1118 | * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data | |
1119 | * specifies a session_id, the session ioctl handler is called. This allows an | |
1120 | * application to retrieve session stats via a tunnel socket. | |
1121 | */ | |
1122 | static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel, | |
1123 | unsigned int cmd, unsigned long arg) | |
1124 | { | |
1125 | int err = 0; | |
1126 | struct sock *sk; | |
1127 | struct pppol2tp_ioc_stats stats; | |
1128 | ||
fba40c63 | 1129 | l2tp_dbg(tunnel, L2TP_MSG_CONTROL, |
a4ca44fa JP |
1130 | "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n", |
1131 | tunnel->name, cmd, arg); | |
fd558d18 JC |
1132 | |
1133 | sk = tunnel->sock; | |
1134 | sock_hold(sk); | |
1135 | ||
1136 | switch (cmd) { | |
1137 | case PPPIOCGL2TPSTATS: | |
1138 | err = -ENXIO; | |
1139 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1140 | break; | |
1141 | ||
1142 | if (copy_from_user(&stats, (void __user *) arg, | |
1143 | sizeof(stats))) { | |
1144 | err = -EFAULT; | |
1145 | break; | |
1146 | } | |
1147 | if (stats.session_id != 0) { | |
1148 | /* resend to session ioctl handler */ | |
1149 | struct l2tp_session *session = | |
57377d63 GN |
1150 | l2tp_session_get(sock_net(sk), tunnel, |
1151 | stats.session_id, true); | |
1152 | ||
1153 | if (session) { | |
1154 | err = pppol2tp_session_ioctl(session, cmd, | |
1155 | arg); | |
1156 | if (session->deref) | |
1157 | session->deref(session); | |
1158 | l2tp_session_dec_refcount(session); | |
1159 | } else { | |
fd558d18 | 1160 | err = -EBADR; |
57377d63 | 1161 | } |
fd558d18 JC |
1162 | break; |
1163 | } | |
1164 | #ifdef CONFIG_XFRM | |
1165 | stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0; | |
1166 | #endif | |
1167 | pppol2tp_copy_stats(&stats, &tunnel->stats); | |
1168 | if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) { | |
1169 | err = -EFAULT; | |
1170 | break; | |
1171 | } | |
fba40c63 | 1172 | l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get L2TP stats\n", |
a4ca44fa | 1173 | tunnel->name); |
fd558d18 JC |
1174 | err = 0; |
1175 | break; | |
1176 | ||
1177 | default: | |
1178 | err = -ENOSYS; | |
1179 | break; | |
1180 | } | |
1181 | ||
1182 | sock_put(sk); | |
1183 | ||
1184 | return err; | |
1185 | } | |
1186 | ||
1187 | /* Main ioctl() handler. | |
1188 | * Dispatch to tunnel or session helpers depending on the socket. | |
1189 | */ | |
1190 | static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd, | |
1191 | unsigned long arg) | |
1192 | { | |
1193 | struct sock *sk = sock->sk; | |
1194 | struct l2tp_session *session; | |
1195 | struct l2tp_tunnel *tunnel; | |
1196 | struct pppol2tp_session *ps; | |
1197 | int err; | |
1198 | ||
1199 | if (!sk) | |
1200 | return 0; | |
1201 | ||
1202 | err = -EBADF; | |
1203 | if (sock_flag(sk, SOCK_DEAD) != 0) | |
1204 | goto end; | |
1205 | ||
1206 | err = -ENOTCONN; | |
1207 | if ((sk->sk_user_data == NULL) || | |
1208 | (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)))) | |
1209 | goto end; | |
1210 | ||
1211 | /* Get session context from the socket */ | |
1212 | err = -EBADF; | |
1213 | session = pppol2tp_sock_to_session(sk); | |
1214 | if (session == NULL) | |
1215 | goto end; | |
1216 | ||
1217 | /* Special case: if session's session_id is zero, treat ioctl as a | |
1218 | * tunnel ioctl | |
1219 | */ | |
1220 | ps = l2tp_session_priv(session); | |
1221 | if ((session->session_id == 0) && | |
1222 | (session->peer_session_id == 0)) { | |
1223 | err = -EBADF; | |
1224 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
1225 | if (tunnel == NULL) | |
1226 | goto end_put_sess; | |
1227 | ||
1228 | err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg); | |
1229 | sock_put(ps->tunnel_sock); | |
1230 | goto end_put_sess; | |
1231 | } | |
1232 | ||
1233 | err = pppol2tp_session_ioctl(session, cmd, arg); | |
1234 | ||
1235 | end_put_sess: | |
1236 | sock_put(sk); | |
1237 | end: | |
1238 | return err; | |
1239 | } | |
1240 | ||
1241 | /***************************************************************************** | |
1242 | * setsockopt() / getsockopt() support. | |
1243 | * | |
1244 | * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP | |
1245 | * sockets. In order to control kernel tunnel features, we allow userspace to | |
1246 | * create a special "tunnel" PPPoX socket which is used for control only. | |
1247 | * Tunnel PPPoX sockets have session_id == 0 and simply allow the user | |
1248 | * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls. | |
1249 | *****************************************************************************/ | |
1250 | ||
1251 | /* Tunnel setsockopt() helper. | |
1252 | */ | |
1253 | static int pppol2tp_tunnel_setsockopt(struct sock *sk, | |
1254 | struct l2tp_tunnel *tunnel, | |
1255 | int optname, int val) | |
1256 | { | |
1257 | int err = 0; | |
1258 | ||
1259 | switch (optname) { | |
1260 | case PPPOL2TP_SO_DEBUG: | |
1261 | tunnel->debug = val; | |
fba40c63 | 1262 | l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: set debug=%x\n", |
a4ca44fa | 1263 | tunnel->name, tunnel->debug); |
fd558d18 JC |
1264 | break; |
1265 | ||
1266 | default: | |
1267 | err = -ENOPROTOOPT; | |
1268 | break; | |
1269 | } | |
1270 | ||
1271 | return err; | |
1272 | } | |
1273 | ||
1274 | /* Session setsockopt helper. | |
1275 | */ | |
1276 | static int pppol2tp_session_setsockopt(struct sock *sk, | |
1277 | struct l2tp_session *session, | |
1278 | int optname, int val) | |
1279 | { | |
1280 | int err = 0; | |
1281 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
1282 | ||
1283 | switch (optname) { | |
1284 | case PPPOL2TP_SO_RECVSEQ: | |
1285 | if ((val != 0) && (val != 1)) { | |
1286 | err = -EINVAL; | |
1287 | break; | |
1288 | } | |
3f9b9770 | 1289 | session->recv_seq = !!val; |
fba40c63 | 1290 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa JP |
1291 | "%s: set recv_seq=%d\n", |
1292 | session->name, session->recv_seq); | |
fd558d18 JC |
1293 | break; |
1294 | ||
1295 | case PPPOL2TP_SO_SENDSEQ: | |
1296 | if ((val != 0) && (val != 1)) { | |
1297 | err = -EINVAL; | |
1298 | break; | |
1299 | } | |
3f9b9770 | 1300 | session->send_seq = !!val; |
fd558d18 JC |
1301 | { |
1302 | struct sock *ssk = ps->sock; | |
1303 | struct pppox_sock *po = pppox_sk(ssk); | |
1304 | po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ : | |
1305 | PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
1306 | } | |
bb5016ea | 1307 | l2tp_session_set_header_len(session, session->tunnel->version); |
fba40c63 | 1308 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa JP |
1309 | "%s: set send_seq=%d\n", |
1310 | session->name, session->send_seq); | |
fd558d18 JC |
1311 | break; |
1312 | ||
1313 | case PPPOL2TP_SO_LNSMODE: | |
1314 | if ((val != 0) && (val != 1)) { | |
1315 | err = -EINVAL; | |
1316 | break; | |
1317 | } | |
3f9b9770 | 1318 | session->lns_mode = !!val; |
fba40c63 | 1319 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa JP |
1320 | "%s: set lns_mode=%d\n", |
1321 | session->name, session->lns_mode); | |
fd558d18 JC |
1322 | break; |
1323 | ||
1324 | case PPPOL2TP_SO_DEBUG: | |
1325 | session->debug = val; | |
fba40c63 | 1326 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: set debug=%x\n", |
a4ca44fa | 1327 | session->name, session->debug); |
fd558d18 JC |
1328 | break; |
1329 | ||
1330 | case PPPOL2TP_SO_REORDERTO: | |
1331 | session->reorder_timeout = msecs_to_jiffies(val); | |
fba40c63 | 1332 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa JP |
1333 | "%s: set reorder_timeout=%d\n", |
1334 | session->name, session->reorder_timeout); | |
fd558d18 JC |
1335 | break; |
1336 | ||
1337 | default: | |
1338 | err = -ENOPROTOOPT; | |
1339 | break; | |
1340 | } | |
1341 | ||
1342 | return err; | |
1343 | } | |
1344 | ||
1345 | /* Main setsockopt() entry point. | |
1346 | * Does API checks, then calls either the tunnel or session setsockopt | |
1347 | * handler, according to whether the PPPoL2TP socket is a for a regular | |
1348 | * session or the special tunnel type. | |
1349 | */ | |
1350 | static int pppol2tp_setsockopt(struct socket *sock, int level, int optname, | |
1351 | char __user *optval, unsigned int optlen) | |
1352 | { | |
1353 | struct sock *sk = sock->sk; | |
1354 | struct l2tp_session *session; | |
1355 | struct l2tp_tunnel *tunnel; | |
1356 | struct pppol2tp_session *ps; | |
1357 | int val; | |
1358 | int err; | |
1359 | ||
1360 | if (level != SOL_PPPOL2TP) | |
3cf521f7 | 1361 | return -EINVAL; |
fd558d18 JC |
1362 | |
1363 | if (optlen < sizeof(int)) | |
1364 | return -EINVAL; | |
1365 | ||
1366 | if (get_user(val, (int __user *)optval)) | |
1367 | return -EFAULT; | |
1368 | ||
1369 | err = -ENOTCONN; | |
1370 | if (sk->sk_user_data == NULL) | |
1371 | goto end; | |
1372 | ||
1373 | /* Get session context from the socket */ | |
1374 | err = -EBADF; | |
1375 | session = pppol2tp_sock_to_session(sk); | |
1376 | if (session == NULL) | |
1377 | goto end; | |
1378 | ||
1379 | /* Special case: if session_id == 0x0000, treat as operation on tunnel | |
1380 | */ | |
1381 | ps = l2tp_session_priv(session); | |
1382 | if ((session->session_id == 0) && | |
1383 | (session->peer_session_id == 0)) { | |
1384 | err = -EBADF; | |
1385 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
1386 | if (tunnel == NULL) | |
1387 | goto end_put_sess; | |
1388 | ||
1389 | err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val); | |
1390 | sock_put(ps->tunnel_sock); | |
1391 | } else | |
1392 | err = pppol2tp_session_setsockopt(sk, session, optname, val); | |
1393 | ||
fd558d18 JC |
1394 | end_put_sess: |
1395 | sock_put(sk); | |
1396 | end: | |
1397 | return err; | |
1398 | } | |
1399 | ||
1400 | /* Tunnel getsockopt helper. Called with sock locked. | |
1401 | */ | |
1402 | static int pppol2tp_tunnel_getsockopt(struct sock *sk, | |
1403 | struct l2tp_tunnel *tunnel, | |
1404 | int optname, int *val) | |
1405 | { | |
1406 | int err = 0; | |
1407 | ||
1408 | switch (optname) { | |
1409 | case PPPOL2TP_SO_DEBUG: | |
1410 | *val = tunnel->debug; | |
fba40c63 | 1411 | l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get debug=%x\n", |
a4ca44fa | 1412 | tunnel->name, tunnel->debug); |
fd558d18 JC |
1413 | break; |
1414 | ||
1415 | default: | |
1416 | err = -ENOPROTOOPT; | |
1417 | break; | |
1418 | } | |
1419 | ||
1420 | return err; | |
1421 | } | |
1422 | ||
1423 | /* Session getsockopt helper. Called with sock locked. | |
1424 | */ | |
1425 | static int pppol2tp_session_getsockopt(struct sock *sk, | |
1426 | struct l2tp_session *session, | |
1427 | int optname, int *val) | |
1428 | { | |
1429 | int err = 0; | |
1430 | ||
1431 | switch (optname) { | |
1432 | case PPPOL2TP_SO_RECVSEQ: | |
1433 | *val = session->recv_seq; | |
fba40c63 | 1434 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa | 1435 | "%s: get recv_seq=%d\n", session->name, *val); |
fd558d18 JC |
1436 | break; |
1437 | ||
1438 | case PPPOL2TP_SO_SENDSEQ: | |
1439 | *val = session->send_seq; | |
fba40c63 | 1440 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa | 1441 | "%s: get send_seq=%d\n", session->name, *val); |
fd558d18 JC |
1442 | break; |
1443 | ||
1444 | case PPPOL2TP_SO_LNSMODE: | |
1445 | *val = session->lns_mode; | |
fba40c63 | 1446 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa | 1447 | "%s: get lns_mode=%d\n", session->name, *val); |
fd558d18 JC |
1448 | break; |
1449 | ||
1450 | case PPPOL2TP_SO_DEBUG: | |
1451 | *val = session->debug; | |
fba40c63 | 1452 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: get debug=%d\n", |
a4ca44fa | 1453 | session->name, *val); |
fd558d18 JC |
1454 | break; |
1455 | ||
1456 | case PPPOL2TP_SO_REORDERTO: | |
1457 | *val = (int) jiffies_to_msecs(session->reorder_timeout); | |
fba40c63 | 1458 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa | 1459 | "%s: get reorder_timeout=%d\n", session->name, *val); |
fd558d18 JC |
1460 | break; |
1461 | ||
1462 | default: | |
1463 | err = -ENOPROTOOPT; | |
1464 | } | |
1465 | ||
1466 | return err; | |
1467 | } | |
1468 | ||
1469 | /* Main getsockopt() entry point. | |
1470 | * Does API checks, then calls either the tunnel or session getsockopt | |
1471 | * handler, according to whether the PPPoX socket is a for a regular session | |
1472 | * or the special tunnel type. | |
1473 | */ | |
e3192690 JP |
1474 | static int pppol2tp_getsockopt(struct socket *sock, int level, int optname, |
1475 | char __user *optval, int __user *optlen) | |
fd558d18 JC |
1476 | { |
1477 | struct sock *sk = sock->sk; | |
1478 | struct l2tp_session *session; | |
1479 | struct l2tp_tunnel *tunnel; | |
1480 | int val, len; | |
1481 | int err; | |
1482 | struct pppol2tp_session *ps; | |
1483 | ||
1484 | if (level != SOL_PPPOL2TP) | |
3cf521f7 | 1485 | return -EINVAL; |
fd558d18 | 1486 | |
e3192690 | 1487 | if (get_user(len, optlen)) |
fd558d18 JC |
1488 | return -EFAULT; |
1489 | ||
1490 | len = min_t(unsigned int, len, sizeof(int)); | |
1491 | ||
1492 | if (len < 0) | |
1493 | return -EINVAL; | |
1494 | ||
1495 | err = -ENOTCONN; | |
1496 | if (sk->sk_user_data == NULL) | |
1497 | goto end; | |
1498 | ||
1499 | /* Get the session context */ | |
1500 | err = -EBADF; | |
1501 | session = pppol2tp_sock_to_session(sk); | |
1502 | if (session == NULL) | |
1503 | goto end; | |
1504 | ||
1505 | /* Special case: if session_id == 0x0000, treat as operation on tunnel */ | |
1506 | ps = l2tp_session_priv(session); | |
1507 | if ((session->session_id == 0) && | |
1508 | (session->peer_session_id == 0)) { | |
1509 | err = -EBADF; | |
1510 | tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock); | |
1511 | if (tunnel == NULL) | |
1512 | goto end_put_sess; | |
1513 | ||
1514 | err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val); | |
1515 | sock_put(ps->tunnel_sock); | |
321a52a3 GN |
1516 | if (err) |
1517 | goto end_put_sess; | |
1518 | } else { | |
fd558d18 | 1519 | err = pppol2tp_session_getsockopt(sk, session, optname, &val); |
321a52a3 GN |
1520 | if (err) |
1521 | goto end_put_sess; | |
1522 | } | |
fd558d18 JC |
1523 | |
1524 | err = -EFAULT; | |
e3192690 | 1525 | if (put_user(len, optlen)) |
fd558d18 JC |
1526 | goto end_put_sess; |
1527 | ||
1528 | if (copy_to_user((void __user *) optval, &val, len)) | |
1529 | goto end_put_sess; | |
1530 | ||
1531 | err = 0; | |
1532 | ||
1533 | end_put_sess: | |
1534 | sock_put(sk); | |
1535 | end: | |
1536 | return err; | |
1537 | } | |
1538 | ||
1539 | /***************************************************************************** | |
1540 | * /proc filesystem for debug | |
f7faffa3 JC |
1541 | * Since the original pppol2tp driver provided /proc/net/pppol2tp for |
1542 | * L2TPv2, we dump only L2TPv2 tunnels and sessions here. | |
fd558d18 JC |
1543 | *****************************************************************************/ |
1544 | ||
1545 | static unsigned int pppol2tp_net_id; | |
1546 | ||
1547 | #ifdef CONFIG_PROC_FS | |
1548 | ||
1549 | struct pppol2tp_seq_data { | |
1550 | struct seq_net_private p; | |
1551 | int tunnel_idx; /* current tunnel */ | |
1552 | int session_idx; /* index of session within current tunnel */ | |
1553 | struct l2tp_tunnel *tunnel; | |
1554 | struct l2tp_session *session; /* NULL means get next tunnel */ | |
1555 | }; | |
1556 | ||
1557 | static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd) | |
1558 | { | |
f7faffa3 JC |
1559 | for (;;) { |
1560 | pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx); | |
1561 | pd->tunnel_idx++; | |
1562 | ||
1563 | if (pd->tunnel == NULL) | |
1564 | break; | |
1565 | ||
1566 | /* Ignore L2TPv3 tunnels */ | |
1567 | if (pd->tunnel->version < 3) | |
1568 | break; | |
1569 | } | |
fd558d18 JC |
1570 | } |
1571 | ||
1572 | static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd) | |
1573 | { | |
e08293a4 | 1574 | pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx, true); |
fd558d18 | 1575 | pd->session_idx++; |
f7faffa3 | 1576 | |
fd558d18 JC |
1577 | if (pd->session == NULL) { |
1578 | pd->session_idx = 0; | |
1579 | pppol2tp_next_tunnel(net, pd); | |
1580 | } | |
1581 | } | |
1582 | ||
1583 | static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs) | |
1584 | { | |
1585 | struct pppol2tp_seq_data *pd = SEQ_START_TOKEN; | |
1586 | loff_t pos = *offs; | |
1587 | struct net *net; | |
1588 | ||
1589 | if (!pos) | |
1590 | goto out; | |
1591 | ||
1592 | BUG_ON(m->private == NULL); | |
1593 | pd = m->private; | |
1594 | net = seq_file_net(m); | |
1595 | ||
1596 | if (pd->tunnel == NULL) | |
1597 | pppol2tp_next_tunnel(net, pd); | |
1598 | else | |
1599 | pppol2tp_next_session(net, pd); | |
1600 | ||
1601 | /* NULL tunnel and session indicates end of list */ | |
1602 | if ((pd->tunnel == NULL) && (pd->session == NULL)) | |
1603 | pd = NULL; | |
1604 | ||
1605 | out: | |
1606 | return pd; | |
1607 | } | |
1608 | ||
1609 | static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
1610 | { | |
1611 | (*pos)++; | |
1612 | return NULL; | |
1613 | } | |
1614 | ||
1615 | static void pppol2tp_seq_stop(struct seq_file *p, void *v) | |
1616 | { | |
1617 | /* nothing to do */ | |
1618 | } | |
1619 | ||
1620 | static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v) | |
1621 | { | |
1622 | struct l2tp_tunnel *tunnel = v; | |
1623 | ||
1624 | seq_printf(m, "\nTUNNEL '%s', %c %d\n", | |
1625 | tunnel->name, | |
1626 | (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N', | |
fbea9e07 | 1627 | refcount_read(&tunnel->ref_count) - 1); |
7b7c0719 | 1628 | seq_printf(m, " %08x %ld/%ld/%ld %ld/%ld/%ld\n", |
fd558d18 | 1629 | tunnel->debug, |
7b7c0719 TP |
1630 | atomic_long_read(&tunnel->stats.tx_packets), |
1631 | atomic_long_read(&tunnel->stats.tx_bytes), | |
1632 | atomic_long_read(&tunnel->stats.tx_errors), | |
1633 | atomic_long_read(&tunnel->stats.rx_packets), | |
1634 | atomic_long_read(&tunnel->stats.rx_bytes), | |
1635 | atomic_long_read(&tunnel->stats.rx_errors)); | |
fd558d18 JC |
1636 | } |
1637 | ||
1638 | static void pppol2tp_seq_session_show(struct seq_file *m, void *v) | |
1639 | { | |
1640 | struct l2tp_session *session = v; | |
1641 | struct l2tp_tunnel *tunnel = session->tunnel; | |
1642 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
9345471b | 1643 | struct pppox_sock *po = pppox_sk(ps->sock); |
fd558d18 JC |
1644 | u32 ip = 0; |
1645 | u16 port = 0; | |
1646 | ||
1647 | if (tunnel->sock) { | |
1648 | struct inet_sock *inet = inet_sk(tunnel->sock); | |
1649 | ip = ntohl(inet->inet_saddr); | |
1650 | port = ntohs(inet->inet_sport); | |
1651 | } | |
1652 | ||
1653 | seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> " | |
1654 | "%04X/%04X %d %c\n", | |
1655 | session->name, ip, port, | |
1656 | tunnel->tunnel_id, | |
1657 | session->session_id, | |
1658 | tunnel->peer_tunnel_id, | |
1659 | session->peer_session_id, | |
1660 | ps->sock->sk_state, | |
1661 | (session == ps->sock->sk_user_data) ? | |
1662 | 'Y' : 'N'); | |
1663 | seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n", | |
1664 | session->mtu, session->mru, | |
1665 | session->recv_seq ? 'R' : '-', | |
1666 | session->send_seq ? 'S' : '-', | |
1667 | session->lns_mode ? "LNS" : "LAC", | |
1668 | session->debug, | |
1669 | jiffies_to_msecs(session->reorder_timeout)); | |
7b7c0719 | 1670 | seq_printf(m, " %hu/%hu %ld/%ld/%ld %ld/%ld/%ld\n", |
fd558d18 | 1671 | session->nr, session->ns, |
7b7c0719 TP |
1672 | atomic_long_read(&session->stats.tx_packets), |
1673 | atomic_long_read(&session->stats.tx_bytes), | |
1674 | atomic_long_read(&session->stats.tx_errors), | |
1675 | atomic_long_read(&session->stats.rx_packets), | |
1676 | atomic_long_read(&session->stats.rx_bytes), | |
1677 | atomic_long_read(&session->stats.rx_errors)); | |
9345471b JC |
1678 | |
1679 | if (po) | |
1680 | seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan)); | |
fd558d18 JC |
1681 | } |
1682 | ||
1683 | static int pppol2tp_seq_show(struct seq_file *m, void *v) | |
1684 | { | |
1685 | struct pppol2tp_seq_data *pd = v; | |
1686 | ||
1687 | /* display header on line 1 */ | |
1688 | if (v == SEQ_START_TOKEN) { | |
1689 | seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n"); | |
1690 | seq_puts(m, "TUNNEL name, user-data-ok session-count\n"); | |
1691 | seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
1692 | seq_puts(m, " SESSION name, addr/port src-tid/sid " | |
1693 | "dest-tid/sid state user-data-ok\n"); | |
1694 | seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n"); | |
1695 | seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
1696 | goto out; | |
1697 | } | |
1698 | ||
1699 | /* Show the tunnel or session context. | |
1700 | */ | |
e08293a4 | 1701 | if (!pd->session) { |
fd558d18 | 1702 | pppol2tp_seq_tunnel_show(m, pd->tunnel); |
e08293a4 | 1703 | } else { |
fd558d18 | 1704 | pppol2tp_seq_session_show(m, pd->session); |
e08293a4 GN |
1705 | if (pd->session->deref) |
1706 | pd->session->deref(pd->session); | |
1707 | l2tp_session_dec_refcount(pd->session); | |
1708 | } | |
fd558d18 JC |
1709 | |
1710 | out: | |
1711 | return 0; | |
1712 | } | |
1713 | ||
1714 | static const struct seq_operations pppol2tp_seq_ops = { | |
1715 | .start = pppol2tp_seq_start, | |
1716 | .next = pppol2tp_seq_next, | |
1717 | .stop = pppol2tp_seq_stop, | |
1718 | .show = pppol2tp_seq_show, | |
1719 | }; | |
1720 | ||
1721 | /* Called when our /proc file is opened. We allocate data for use when | |
1722 | * iterating our tunnel / session contexts and store it in the private | |
1723 | * data of the seq_file. | |
1724 | */ | |
1725 | static int pppol2tp_proc_open(struct inode *inode, struct file *file) | |
1726 | { | |
1727 | return seq_open_net(inode, file, &pppol2tp_seq_ops, | |
1728 | sizeof(struct pppol2tp_seq_data)); | |
1729 | } | |
1730 | ||
1731 | static const struct file_operations pppol2tp_proc_fops = { | |
1732 | .owner = THIS_MODULE, | |
1733 | .open = pppol2tp_proc_open, | |
1734 | .read = seq_read, | |
1735 | .llseek = seq_lseek, | |
1736 | .release = seq_release_net, | |
1737 | }; | |
1738 | ||
1739 | #endif /* CONFIG_PROC_FS */ | |
1740 | ||
1741 | /***************************************************************************** | |
1742 | * Network namespace | |
1743 | *****************************************************************************/ | |
1744 | ||
1745 | static __net_init int pppol2tp_init_net(struct net *net) | |
1746 | { | |
1747 | struct proc_dir_entry *pde; | |
1748 | int err = 0; | |
1749 | ||
d4beaa66 G |
1750 | pde = proc_create("pppol2tp", S_IRUGO, net->proc_net, |
1751 | &pppol2tp_proc_fops); | |
fd558d18 JC |
1752 | if (!pde) { |
1753 | err = -ENOMEM; | |
1754 | goto out; | |
1755 | } | |
1756 | ||
1757 | out: | |
1758 | return err; | |
1759 | } | |
1760 | ||
1761 | static __net_exit void pppol2tp_exit_net(struct net *net) | |
1762 | { | |
ece31ffd | 1763 | remove_proc_entry("pppol2tp", net->proc_net); |
fd558d18 JC |
1764 | } |
1765 | ||
1766 | static struct pernet_operations pppol2tp_net_ops = { | |
1767 | .init = pppol2tp_init_net, | |
1768 | .exit = pppol2tp_exit_net, | |
1769 | .id = &pppol2tp_net_id, | |
1770 | }; | |
1771 | ||
1772 | /***************************************************************************** | |
1773 | * Init and cleanup | |
1774 | *****************************************************************************/ | |
1775 | ||
1776 | static const struct proto_ops pppol2tp_ops = { | |
1777 | .family = AF_PPPOX, | |
1778 | .owner = THIS_MODULE, | |
1779 | .release = pppol2tp_release, | |
1780 | .bind = sock_no_bind, | |
1781 | .connect = pppol2tp_connect, | |
1782 | .socketpair = sock_no_socketpair, | |
1783 | .accept = sock_no_accept, | |
1784 | .getname = pppol2tp_getname, | |
1785 | .poll = datagram_poll, | |
1786 | .listen = sock_no_listen, | |
1787 | .shutdown = sock_no_shutdown, | |
1788 | .setsockopt = pppol2tp_setsockopt, | |
1789 | .getsockopt = pppol2tp_getsockopt, | |
1790 | .sendmsg = pppol2tp_sendmsg, | |
1791 | .recvmsg = pppol2tp_recvmsg, | |
1792 | .mmap = sock_no_mmap, | |
1793 | .ioctl = pppox_ioctl, | |
1794 | }; | |
1795 | ||
756e64a0 | 1796 | static const struct pppox_proto pppol2tp_proto = { |
fd558d18 | 1797 | .create = pppol2tp_create, |
e1558a93 WY |
1798 | .ioctl = pppol2tp_ioctl, |
1799 | .owner = THIS_MODULE, | |
fd558d18 JC |
1800 | }; |
1801 | ||
309795f4 JC |
1802 | #ifdef CONFIG_L2TP_V3 |
1803 | ||
1804 | static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = { | |
1805 | .session_create = pppol2tp_session_create, | |
cf2f5c88 | 1806 | .session_delete = l2tp_session_delete, |
309795f4 JC |
1807 | }; |
1808 | ||
1809 | #endif /* CONFIG_L2TP_V3 */ | |
1810 | ||
fd558d18 JC |
1811 | static int __init pppol2tp_init(void) |
1812 | { | |
1813 | int err; | |
1814 | ||
1815 | err = register_pernet_device(&pppol2tp_net_ops); | |
1816 | if (err) | |
1817 | goto out; | |
1818 | ||
1819 | err = proto_register(&pppol2tp_sk_proto, 0); | |
1820 | if (err) | |
1821 | goto out_unregister_pppol2tp_pernet; | |
1822 | ||
1823 | err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto); | |
1824 | if (err) | |
1825 | goto out_unregister_pppol2tp_proto; | |
1826 | ||
309795f4 JC |
1827 | #ifdef CONFIG_L2TP_V3 |
1828 | err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops); | |
1829 | if (err) | |
1830 | goto out_unregister_pppox; | |
1831 | #endif | |
1832 | ||
a4ca44fa | 1833 | pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION); |
fd558d18 JC |
1834 | |
1835 | out: | |
1836 | return err; | |
309795f4 JC |
1837 | |
1838 | #ifdef CONFIG_L2TP_V3 | |
1839 | out_unregister_pppox: | |
1840 | unregister_pppox_proto(PX_PROTO_OL2TP); | |
1841 | #endif | |
fd558d18 JC |
1842 | out_unregister_pppol2tp_proto: |
1843 | proto_unregister(&pppol2tp_sk_proto); | |
1844 | out_unregister_pppol2tp_pernet: | |
1845 | unregister_pernet_device(&pppol2tp_net_ops); | |
1846 | goto out; | |
1847 | } | |
1848 | ||
1849 | static void __exit pppol2tp_exit(void) | |
1850 | { | |
309795f4 JC |
1851 | #ifdef CONFIG_L2TP_V3 |
1852 | l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP); | |
1853 | #endif | |
fd558d18 JC |
1854 | unregister_pppox_proto(PX_PROTO_OL2TP); |
1855 | proto_unregister(&pppol2tp_sk_proto); | |
1856 | unregister_pernet_device(&pppol2tp_net_ops); | |
1857 | } | |
1858 | ||
1859 | module_init(pppol2tp_init); | |
1860 | module_exit(pppol2tp_exit); | |
1861 | ||
1862 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); | |
1863 | MODULE_DESCRIPTION("PPP over L2TP over UDP"); | |
1864 | MODULE_LICENSE("GPL"); | |
1865 | MODULE_VERSION(PPPOL2TP_DRV_VERSION); | |
681b4d88 | 1866 | MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_OL2TP); |
249ee819 | 1867 | MODULE_ALIAS_L2TP_PWTYPE(7); |