Commit | Line | Data |
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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> | |
fd558d18 JC |
96 | #include <net/ip.h> |
97 | #include <net/udp.h> | |
cf2f5c88 | 98 | #include <net/inet_common.h> |
fd558d18 JC |
99 | |
100 | #include <asm/byteorder.h> | |
60063497 | 101 | #include <linux/atomic.h> |
fd558d18 JC |
102 | |
103 | #include "l2tp_core.h" | |
104 | ||
105 | #define PPPOL2TP_DRV_VERSION "V2.0" | |
106 | ||
107 | /* Space for UDP, L2TP and PPP headers */ | |
108 | #define PPPOL2TP_HEADER_OVERHEAD 40 | |
109 | ||
fd558d18 JC |
110 | /* Number of bytes to build transmit L2TP headers. |
111 | * Unfortunately the size is different depending on whether sequence numbers | |
112 | * are enabled. | |
113 | */ | |
114 | #define PPPOL2TP_L2TP_HDR_SIZE_SEQ 10 | |
115 | #define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ 6 | |
116 | ||
117 | /* Private data of each session. This data lives at the end of struct | |
118 | * l2tp_session, referenced via session->priv[]. | |
119 | */ | |
120 | struct pppol2tp_session { | |
121 | int owner; /* pid that opened the socket */ | |
122 | ||
ee40fb2e GN |
123 | struct mutex sk_lock; /* Protects .sk */ |
124 | struct sock __rcu *sk; /* Pointer to the session | |
fd558d18 | 125 | * PPPoX socket */ |
ee40fb2e GN |
126 | struct sock *__sk; /* Copy of .sk, for cleanup */ |
127 | struct rcu_head rcu; /* For asynchronous release */ | |
fd558d18 JC |
128 | }; |
129 | ||
130 | static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb); | |
131 | ||
d7100da0 | 132 | static const struct ppp_channel_ops pppol2tp_chan_ops = { |
133 | .start_xmit = pppol2tp_xmit, | |
134 | }; | |
135 | ||
fd558d18 JC |
136 | static const struct proto_ops pppol2tp_ops; |
137 | ||
ee40fb2e GN |
138 | /* Retrieves the pppol2tp socket associated to a session. |
139 | * A reference is held on the returned socket, so this function must be paired | |
140 | * with sock_put(). | |
141 | */ | |
142 | static struct sock *pppol2tp_session_get_sock(struct l2tp_session *session) | |
143 | { | |
144 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
145 | struct sock *sk; | |
146 | ||
147 | rcu_read_lock(); | |
148 | sk = rcu_dereference(ps->sk); | |
149 | if (sk) | |
150 | sock_hold(sk); | |
151 | rcu_read_unlock(); | |
152 | ||
153 | return sk; | |
154 | } | |
155 | ||
fd558d18 JC |
156 | /* Helpers to obtain tunnel/session contexts from sockets. |
157 | */ | |
158 | static inline struct l2tp_session *pppol2tp_sock_to_session(struct sock *sk) | |
159 | { | |
160 | struct l2tp_session *session; | |
161 | ||
162 | if (sk == NULL) | |
163 | return NULL; | |
164 | ||
165 | sock_hold(sk); | |
166 | session = (struct l2tp_session *)(sk->sk_user_data); | |
167 | if (session == NULL) { | |
168 | sock_put(sk); | |
169 | goto out; | |
170 | } | |
171 | ||
172 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
173 | ||
174 | out: | |
175 | return session; | |
176 | } | |
177 | ||
178 | /***************************************************************************** | |
179 | * Receive data handling | |
180 | *****************************************************************************/ | |
181 | ||
fd558d18 JC |
182 | /* Receive message. This is the recvmsg for the PPPoL2TP socket. |
183 | */ | |
1b784140 YX |
184 | static int pppol2tp_recvmsg(struct socket *sock, struct msghdr *msg, |
185 | size_t len, int flags) | |
fd558d18 JC |
186 | { |
187 | int err; | |
188 | struct sk_buff *skb; | |
189 | struct sock *sk = sock->sk; | |
190 | ||
191 | err = -EIO; | |
192 | if (sk->sk_state & PPPOX_BOUND) | |
193 | goto end; | |
194 | ||
fd558d18 JC |
195 | err = 0; |
196 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
197 | flags & MSG_DONTWAIT, &err); | |
198 | if (!skb) | |
199 | goto end; | |
200 | ||
201 | if (len > skb->len) | |
202 | len = skb->len; | |
203 | else if (len < skb->len) | |
204 | msg->msg_flags |= MSG_TRUNC; | |
205 | ||
51f3d02b | 206 | err = skb_copy_datagram_msg(skb, 0, msg, len); |
fd558d18 JC |
207 | if (likely(err == 0)) |
208 | err = len; | |
209 | ||
210 | kfree_skb(skb); | |
211 | end: | |
212 | return err; | |
213 | } | |
214 | ||
215 | static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len) | |
216 | { | |
217 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
218 | struct sock *sk = NULL; | |
219 | ||
220 | /* If the socket is bound, send it in to PPP's input queue. Otherwise | |
221 | * queue it on the session socket. | |
222 | */ | |
ee40fb2e GN |
223 | rcu_read_lock(); |
224 | sk = rcu_dereference(ps->sk); | |
fd558d18 JC |
225 | if (sk == NULL) |
226 | goto no_sock; | |
227 | ||
2b139e6b GN |
228 | /* If the first two bytes are 0xFF03, consider that it is the PPP's |
229 | * Address and Control fields and skip them. The L2TP module has always | |
230 | * worked this way, although, in theory, the use of these fields should | |
231 | * be negociated and handled at the PPP layer. These fields are | |
232 | * constant: 0xFF is the All-Stations Address and 0x03 the Unnumbered | |
233 | * Information command with Poll/Final bit set to zero (RFC 1662). | |
234 | */ | |
235 | if (pskb_may_pull(skb, 2) && skb->data[0] == PPP_ALLSTATIONS && | |
236 | skb->data[1] == PPP_UI) | |
237 | skb_pull(skb, 2); | |
238 | ||
fd558d18 JC |
239 | if (sk->sk_state & PPPOX_BOUND) { |
240 | struct pppox_sock *po; | |
98f40b3e | 241 | |
fba40c63 | 242 | l2tp_dbg(session, L2TP_MSG_DATA, |
a4ca44fa JP |
243 | "%s: recv %d byte data frame, passing to ppp\n", |
244 | session->name, data_len); | |
fd558d18 | 245 | |
fd558d18 JC |
246 | po = pppox_sk(sk); |
247 | ppp_input(&po->chan, skb); | |
248 | } else { | |
fba40c63 | 249 | l2tp_dbg(session, L2TP_MSG_DATA, |
9e9cb622 GN |
250 | "%s: recv %d byte data frame, passing to L2TP socket\n", |
251 | session->name, data_len); | |
fd558d18 | 252 | |
9e9cb622 GN |
253 | if (sock_queue_rcv_skb(sk, skb) < 0) { |
254 | atomic_long_inc(&session->stats.rx_errors); | |
255 | kfree_skb(skb); | |
256 | } | |
fd558d18 | 257 | } |
ee40fb2e | 258 | rcu_read_unlock(); |
fd558d18 JC |
259 | |
260 | return; | |
261 | ||
262 | no_sock: | |
ee40fb2e | 263 | rcu_read_unlock(); |
fba40c63 | 264 | l2tp_info(session, L2TP_MSG_DATA, "%s: no socket\n", session->name); |
fd558d18 JC |
265 | kfree_skb(skb); |
266 | } | |
267 | ||
fd558d18 JC |
268 | /************************************************************************ |
269 | * Transmit handling | |
270 | ***********************************************************************/ | |
271 | ||
fd558d18 JC |
272 | /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here |
273 | * when a user application does a sendmsg() on the session socket. L2TP and | |
274 | * PPP headers must be inserted into the user's data. | |
275 | */ | |
1b784140 | 276 | static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m, |
fd558d18 JC |
277 | size_t total_len) |
278 | { | |
fd558d18 JC |
279 | struct sock *sk = sock->sk; |
280 | struct sk_buff *skb; | |
281 | int error; | |
282 | struct l2tp_session *session; | |
283 | struct l2tp_tunnel *tunnel; | |
0d76751f | 284 | int uhlen; |
fd558d18 JC |
285 | |
286 | error = -ENOTCONN; | |
287 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
288 | goto error; | |
289 | ||
290 | /* Get session and tunnel contexts */ | |
291 | error = -EBADF; | |
292 | session = pppol2tp_sock_to_session(sk); | |
293 | if (session == NULL) | |
294 | goto error; | |
295 | ||
7198c77a | 296 | tunnel = session->tunnel; |
fd558d18 | 297 | |
0d76751f JC |
298 | uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0; |
299 | ||
fd558d18 JC |
300 | /* Allocate a socket buffer */ |
301 | error = -ENOMEM; | |
302 | skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) + | |
0d76751f | 303 | uhlen + session->hdr_len + |
54c151d9 | 304 | 2 + total_len, /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */ |
fd558d18 JC |
305 | 0, GFP_KERNEL); |
306 | if (!skb) | |
7198c77a | 307 | goto error_put_sess; |
fd558d18 JC |
308 | |
309 | /* Reserve space for headers. */ | |
310 | skb_reserve(skb, NET_SKB_PAD); | |
311 | skb_reset_network_header(skb); | |
312 | skb_reserve(skb, sizeof(struct iphdr)); | |
313 | skb_reset_transport_header(skb); | |
0d76751f | 314 | skb_reserve(skb, uhlen); |
fd558d18 JC |
315 | |
316 | /* Add PPP header */ | |
54c151d9 GF |
317 | skb->data[0] = PPP_ALLSTATIONS; |
318 | skb->data[1] = PPP_UI; | |
fd558d18 JC |
319 | skb_put(skb, 2); |
320 | ||
321 | /* Copy user data into skb */ | |
6ce8e9ce | 322 | error = memcpy_from_msg(skb_put(skb, total_len), m, total_len); |
fd558d18 JC |
323 | if (error < 0) { |
324 | kfree_skb(skb); | |
7198c77a | 325 | goto error_put_sess; |
fd558d18 | 326 | } |
fd558d18 | 327 | |
455cc32b | 328 | local_bh_disable(); |
fd558d18 | 329 | l2tp_xmit_skb(session, skb, session->hdr_len); |
455cc32b | 330 | local_bh_enable(); |
fd558d18 | 331 | |
8b82547e | 332 | sock_put(sk); |
fd558d18 | 333 | |
a6f79d0f | 334 | return total_len; |
fd558d18 | 335 | |
fd558d18 JC |
336 | error_put_sess: |
337 | sock_put(sk); | |
338 | error: | |
339 | return error; | |
340 | } | |
341 | ||
342 | /* Transmit function called by generic PPP driver. Sends PPP frame | |
343 | * over PPPoL2TP socket. | |
344 | * | |
345 | * This is almost the same as pppol2tp_sendmsg(), but rather than | |
346 | * being called with a msghdr from userspace, it is called with a skb | |
347 | * from the kernel. | |
348 | * | |
349 | * The supplied skb from ppp doesn't have enough headroom for the | |
350 | * insertion of L2TP, UDP and IP headers so we need to allocate more | |
351 | * headroom in the skb. This will create a cloned skb. But we must be | |
352 | * careful in the error case because the caller will expect to free | |
353 | * the skb it supplied, not our cloned skb. So we take care to always | |
354 | * leave the original skb unfreed if we return an error. | |
355 | */ | |
356 | static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb) | |
357 | { | |
fd558d18 | 358 | struct sock *sk = (struct sock *) chan->private; |
fd558d18 JC |
359 | struct l2tp_session *session; |
360 | struct l2tp_tunnel *tunnel; | |
09df57ca | 361 | int uhlen, headroom; |
fd558d18 JC |
362 | |
363 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
364 | goto abort; | |
365 | ||
366 | /* Get session and tunnel contexts from the socket */ | |
367 | session = pppol2tp_sock_to_session(sk); | |
368 | if (session == NULL) | |
369 | goto abort; | |
370 | ||
7198c77a | 371 | tunnel = session->tunnel; |
fd558d18 | 372 | |
09df57ca ED |
373 | uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0; |
374 | headroom = NET_SKB_PAD + | |
375 | sizeof(struct iphdr) + /* IP header */ | |
376 | uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */ | |
377 | session->hdr_len + /* L2TP header */ | |
54c151d9 | 378 | 2; /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */ |
09df57ca | 379 | if (skb_cow_head(skb, headroom)) |
7198c77a | 380 | goto abort_put_sess; |
fd558d18 | 381 | |
fd558d18 | 382 | /* Setup PPP header */ |
54c151d9 GF |
383 | __skb_push(skb, 2); |
384 | skb->data[0] = PPP_ALLSTATIONS; | |
385 | skb->data[1] = PPP_UI; | |
fd558d18 | 386 | |
455cc32b | 387 | local_bh_disable(); |
e0d4435f | 388 | l2tp_xmit_skb(session, skb, session->hdr_len); |
455cc32b | 389 | local_bh_enable(); |
fd558d18 | 390 | |
fd558d18 | 391 | sock_put(sk); |
7198c77a | 392 | |
fd558d18 JC |
393 | return 1; |
394 | ||
fd558d18 JC |
395 | abort_put_sess: |
396 | sock_put(sk); | |
397 | abort: | |
398 | /* Free the original skb */ | |
399 | kfree_skb(skb); | |
400 | return 1; | |
401 | } | |
402 | ||
403 | /***************************************************************************** | |
404 | * Session (and tunnel control) socket create/destroy. | |
405 | *****************************************************************************/ | |
406 | ||
d02ba2a6 JC |
407 | static void pppol2tp_put_sk(struct rcu_head *head) |
408 | { | |
409 | struct pppol2tp_session *ps; | |
410 | ||
411 | ps = container_of(head, typeof(*ps), rcu); | |
412 | sock_put(ps->__sk); | |
413 | } | |
414 | ||
fd558d18 JC |
415 | /* Really kill the session socket. (Called from sock_put() if |
416 | * refcnt == 0.) | |
417 | */ | |
418 | static void pppol2tp_session_destruct(struct sock *sk) | |
419 | { | |
f6e16b29 | 420 | struct l2tp_session *session = sk->sk_user_data; |
e91793bb GN |
421 | |
422 | skb_queue_purge(&sk->sk_receive_queue); | |
423 | skb_queue_purge(&sk->sk_write_queue); | |
424 | ||
f6e16b29 | 425 | if (session) { |
fd558d18 JC |
426 | sk->sk_user_data = NULL; |
427 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
428 | l2tp_session_dec_refcount(session); | |
429 | } | |
fd558d18 JC |
430 | } |
431 | ||
432 | /* Called when the PPPoX socket (session) is closed. | |
433 | */ | |
434 | static int pppol2tp_release(struct socket *sock) | |
435 | { | |
436 | struct sock *sk = sock->sk; | |
437 | struct l2tp_session *session; | |
438 | int error; | |
439 | ||
440 | if (!sk) | |
441 | return 0; | |
442 | ||
443 | error = -EBADF; | |
444 | lock_sock(sk); | |
445 | if (sock_flag(sk, SOCK_DEAD) != 0) | |
446 | goto error; | |
447 | ||
448 | pppox_unbind_sock(sk); | |
449 | ||
450 | /* Signal the death of the socket. */ | |
451 | sk->sk_state = PPPOX_DEAD; | |
452 | sock_orphan(sk); | |
453 | sock->sk = NULL; | |
454 | ||
455 | session = pppol2tp_sock_to_session(sk); | |
d02ba2a6 | 456 | if (session) { |
3d609342 GN |
457 | struct pppol2tp_session *ps; |
458 | ||
f98be6c6 | 459 | l2tp_session_delete(session); |
3d609342 GN |
460 | |
461 | ps = l2tp_session_priv(session); | |
462 | mutex_lock(&ps->sk_lock); | |
463 | ps->__sk = rcu_dereference_protected(ps->sk, | |
464 | lockdep_is_held(&ps->sk_lock)); | |
465 | RCU_INIT_POINTER(ps->sk, NULL); | |
466 | mutex_unlock(&ps->sk_lock); | |
467 | call_rcu(&ps->rcu, pppol2tp_put_sk); | |
468 | ||
469 | /* Rely on the sock_put() call at the end of the function for | |
470 | * dropping the reference held by pppol2tp_sock_to_session(). | |
471 | * The last reference will be dropped by pppol2tp_put_sk(). | |
472 | */ | |
fd558d18 | 473 | } |
d02ba2a6 | 474 | |
fd558d18 JC |
475 | release_sock(sk); |
476 | ||
477 | /* This will delete the session context via | |
478 | * pppol2tp_session_destruct() if the socket's refcnt drops to | |
479 | * zero. | |
480 | */ | |
481 | sock_put(sk); | |
482 | ||
483 | return 0; | |
484 | ||
485 | error: | |
486 | release_sock(sk); | |
487 | return error; | |
488 | } | |
489 | ||
490 | static struct proto pppol2tp_sk_proto = { | |
491 | .name = "PPPOL2TP", | |
492 | .owner = THIS_MODULE, | |
493 | .obj_size = sizeof(struct pppox_sock), | |
494 | }; | |
495 | ||
496 | static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb) | |
497 | { | |
498 | int rc; | |
499 | ||
500 | rc = l2tp_udp_encap_recv(sk, skb); | |
501 | if (rc) | |
502 | kfree_skb(skb); | |
503 | ||
504 | return NET_RX_SUCCESS; | |
505 | } | |
506 | ||
507 | /* socket() handler. Initialize a new struct sock. | |
508 | */ | |
11aa9c28 | 509 | static int pppol2tp_create(struct net *net, struct socket *sock, int kern) |
fd558d18 JC |
510 | { |
511 | int error = -ENOMEM; | |
512 | struct sock *sk; | |
513 | ||
11aa9c28 | 514 | sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto, kern); |
fd558d18 JC |
515 | if (!sk) |
516 | goto out; | |
517 | ||
518 | sock_init_data(sock, sk); | |
519 | ||
520 | sock->state = SS_UNCONNECTED; | |
521 | sock->ops = &pppol2tp_ops; | |
522 | ||
523 | sk->sk_backlog_rcv = pppol2tp_backlog_recv; | |
524 | sk->sk_protocol = PX_PROTO_OL2TP; | |
525 | sk->sk_family = PF_PPPOX; | |
526 | sk->sk_state = PPPOX_NONE; | |
527 | sk->sk_type = SOCK_STREAM; | |
528 | sk->sk_destruct = pppol2tp_session_destruct; | |
529 | ||
530 | error = 0; | |
531 | ||
532 | out: | |
533 | return error; | |
534 | } | |
535 | ||
0ad66140 JC |
536 | static void pppol2tp_show(struct seq_file *m, void *arg) |
537 | { | |
538 | struct l2tp_session *session = arg; | |
ee40fb2e GN |
539 | struct sock *sk; |
540 | ||
541 | sk = pppol2tp_session_get_sock(session); | |
542 | if (sk) { | |
543 | struct pppox_sock *po = pppox_sk(sk); | |
0ad66140 | 544 | |
ee40fb2e GN |
545 | seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan)); |
546 | sock_put(sk); | |
0ad66140 JC |
547 | } |
548 | } | |
0ad66140 | 549 | |
f98be6c6 GN |
550 | static void pppol2tp_session_init(struct l2tp_session *session) |
551 | { | |
552 | struct pppol2tp_session *ps; | |
f98be6c6 GN |
553 | |
554 | session->recv_skb = pppol2tp_recv; | |
c2ebc256 AB |
555 | if (IS_ENABLED(CONFIG_L2TP_DEBUGFS)) |
556 | session->show = pppol2tp_show; | |
f98be6c6 GN |
557 | |
558 | ps = l2tp_session_priv(session); | |
559 | mutex_init(&ps->sk_lock); | |
f98be6c6 | 560 | ps->owner = current->pid; |
f98be6c6 GN |
561 | } |
562 | ||
a408194a GN |
563 | struct l2tp_connect_info { |
564 | u8 version; | |
565 | int fd; | |
566 | u32 tunnel_id; | |
567 | u32 peer_tunnel_id; | |
568 | u32 session_id; | |
569 | u32 peer_session_id; | |
570 | }; | |
571 | ||
572 | static int pppol2tp_sockaddr_get_info(const void *sa, int sa_len, | |
573 | struct l2tp_connect_info *info) | |
574 | { | |
575 | switch (sa_len) { | |
576 | case sizeof(struct sockaddr_pppol2tp): | |
577 | { | |
578 | const struct sockaddr_pppol2tp *sa_v2in4 = sa; | |
579 | ||
580 | if (sa_v2in4->sa_protocol != PX_PROTO_OL2TP) | |
581 | return -EINVAL; | |
582 | ||
583 | info->version = 2; | |
584 | info->fd = sa_v2in4->pppol2tp.fd; | |
585 | info->tunnel_id = sa_v2in4->pppol2tp.s_tunnel; | |
586 | info->peer_tunnel_id = sa_v2in4->pppol2tp.d_tunnel; | |
587 | info->session_id = sa_v2in4->pppol2tp.s_session; | |
588 | info->peer_session_id = sa_v2in4->pppol2tp.d_session; | |
589 | ||
590 | break; | |
591 | } | |
592 | case sizeof(struct sockaddr_pppol2tpv3): | |
593 | { | |
594 | const struct sockaddr_pppol2tpv3 *sa_v3in4 = sa; | |
595 | ||
596 | if (sa_v3in4->sa_protocol != PX_PROTO_OL2TP) | |
597 | return -EINVAL; | |
598 | ||
599 | info->version = 3; | |
600 | info->fd = sa_v3in4->pppol2tp.fd; | |
601 | info->tunnel_id = sa_v3in4->pppol2tp.s_tunnel; | |
602 | info->peer_tunnel_id = sa_v3in4->pppol2tp.d_tunnel; | |
603 | info->session_id = sa_v3in4->pppol2tp.s_session; | |
604 | info->peer_session_id = sa_v3in4->pppol2tp.d_session; | |
605 | ||
606 | break; | |
607 | } | |
608 | case sizeof(struct sockaddr_pppol2tpin6): | |
609 | { | |
610 | const struct sockaddr_pppol2tpin6 *sa_v2in6 = sa; | |
611 | ||
612 | if (sa_v2in6->sa_protocol != PX_PROTO_OL2TP) | |
613 | return -EINVAL; | |
614 | ||
615 | info->version = 2; | |
616 | info->fd = sa_v2in6->pppol2tp.fd; | |
617 | info->tunnel_id = sa_v2in6->pppol2tp.s_tunnel; | |
618 | info->peer_tunnel_id = sa_v2in6->pppol2tp.d_tunnel; | |
619 | info->session_id = sa_v2in6->pppol2tp.s_session; | |
620 | info->peer_session_id = sa_v2in6->pppol2tp.d_session; | |
621 | ||
622 | break; | |
623 | } | |
624 | case sizeof(struct sockaddr_pppol2tpv3in6): | |
625 | { | |
626 | const struct sockaddr_pppol2tpv3in6 *sa_v3in6 = sa; | |
627 | ||
628 | if (sa_v3in6->sa_protocol != PX_PROTO_OL2TP) | |
629 | return -EINVAL; | |
630 | ||
631 | info->version = 3; | |
632 | info->fd = sa_v3in6->pppol2tp.fd; | |
633 | info->tunnel_id = sa_v3in6->pppol2tp.s_tunnel; | |
634 | info->peer_tunnel_id = sa_v3in6->pppol2tp.d_tunnel; | |
635 | info->session_id = sa_v3in6->pppol2tp.s_session; | |
636 | info->peer_session_id = sa_v3in6->pppol2tp.d_session; | |
637 | ||
638 | break; | |
639 | } | |
640 | default: | |
641 | return -EINVAL; | |
642 | } | |
643 | ||
644 | return 0; | |
645 | } | |
646 | ||
789141b2 GN |
647 | /* Rough estimation of the maximum payload size a tunnel can transmit without |
648 | * fragmenting at the lower IP layer. Assumes L2TPv2 with sequence | |
649 | * numbers and no IP option. Not quite accurate, but the result is mostly | |
650 | * unused anyway. | |
651 | */ | |
652 | static int pppol2tp_tunnel_mtu(const struct l2tp_tunnel *tunnel) | |
653 | { | |
654 | int mtu; | |
655 | ||
656 | mtu = l2tp_tunnel_dst_mtu(tunnel); | |
657 | if (mtu <= PPPOL2TP_HEADER_OVERHEAD) | |
658 | return 1500 - PPPOL2TP_HEADER_OVERHEAD; | |
659 | ||
660 | return mtu - PPPOL2TP_HEADER_OVERHEAD; | |
661 | } | |
662 | ||
fd558d18 JC |
663 | /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket |
664 | */ | |
665 | static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr, | |
666 | int sockaddr_len, int flags) | |
667 | { | |
668 | struct sock *sk = sock->sk; | |
fd558d18 JC |
669 | struct pppox_sock *po = pppox_sk(sk); |
670 | struct l2tp_session *session = NULL; | |
a408194a | 671 | struct l2tp_connect_info info; |
fd558d18 JC |
672 | struct l2tp_tunnel *tunnel; |
673 | struct pppol2tp_session *ps; | |
fd558d18 | 674 | struct l2tp_session_cfg cfg = { 0, }; |
dbdbc73b | 675 | bool drop_refcnt = false; |
f9e56baf | 676 | bool drop_tunnel = false; |
bda06be2 GN |
677 | bool new_session = false; |
678 | bool new_tunnel = false; | |
a408194a | 679 | int error; |
eb1c28c0 | 680 | |
a408194a GN |
681 | error = pppol2tp_sockaddr_get_info(uservaddr, sockaddr_len, &info); |
682 | if (error < 0) | |
683 | return error; | |
eb1c28c0 | 684 | |
a408194a | 685 | lock_sock(sk); |
fd558d18 JC |
686 | |
687 | /* Check for already bound sockets */ | |
688 | error = -EBUSY; | |
689 | if (sk->sk_state & PPPOX_CONNECTED) | |
690 | goto end; | |
691 | ||
692 | /* We don't supporting rebinding anyway */ | |
693 | error = -EALREADY; | |
694 | if (sk->sk_user_data) | |
695 | goto end; /* socket is already attached */ | |
696 | ||
e0d4435f | 697 | /* Don't bind if tunnel_id is 0 */ |
fd558d18 | 698 | error = -EINVAL; |
a408194a | 699 | if (!info.tunnel_id) |
fd558d18 JC |
700 | goto end; |
701 | ||
a408194a | 702 | tunnel = l2tp_tunnel_get(sock_net(sk), info.tunnel_id); |
f9e56baf GN |
703 | if (tunnel) |
704 | drop_tunnel = true; | |
309795f4 | 705 | |
e0d4435f JC |
706 | /* Special case: create tunnel context if session_id and |
707 | * peer_session_id is 0. Otherwise look up tunnel using supplied | |
fd558d18 JC |
708 | * tunnel id. |
709 | */ | |
a408194a | 710 | if (!info.session_id && !info.peer_session_id) { |
309795f4 JC |
711 | if (tunnel == NULL) { |
712 | struct l2tp_tunnel_cfg tcfg = { | |
713 | .encap = L2TP_ENCAPTYPE_UDP, | |
714 | .debug = 0, | |
715 | }; | |
3e1bc8bf GN |
716 | |
717 | /* Prevent l2tp_tunnel_register() from trying to set up | |
718 | * a kernel socket. | |
719 | */ | |
a408194a | 720 | if (info.fd < 0) { |
3e1bc8bf GN |
721 | error = -EBADF; |
722 | goto end; | |
723 | } | |
724 | ||
a408194a GN |
725 | error = l2tp_tunnel_create(sock_net(sk), info.fd, |
726 | info.version, | |
727 | info.tunnel_id, | |
728 | info.peer_tunnel_id, &tcfg, | |
729 | &tunnel); | |
309795f4 JC |
730 | if (error < 0) |
731 | goto end; | |
6b9f3423 GN |
732 | |
733 | l2tp_tunnel_inc_refcount(tunnel); | |
734 | error = l2tp_tunnel_register(tunnel, sock_net(sk), | |
735 | &tcfg); | |
736 | if (error < 0) { | |
737 | kfree(tunnel); | |
738 | goto end; | |
739 | } | |
740 | drop_tunnel = true; | |
bda06be2 | 741 | new_tunnel = true; |
309795f4 | 742 | } |
fd558d18 | 743 | } else { |
fd558d18 JC |
744 | /* Error if we can't find the tunnel */ |
745 | error = -ENOENT; | |
746 | if (tunnel == NULL) | |
747 | goto end; | |
748 | ||
749 | /* Error if socket is not prepped */ | |
750 | if (tunnel->sock == NULL) | |
751 | goto end; | |
752 | } | |
753 | ||
b79585f5 | 754 | if (tunnel->peer_tunnel_id == 0) |
a408194a | 755 | tunnel->peer_tunnel_id = info.peer_tunnel_id; |
fd558d18 | 756 | |
01e28b92 | 757 | session = l2tp_tunnel_get_session(tunnel, info.session_id); |
dbdbc73b GN |
758 | if (session) { |
759 | drop_refcnt = true; | |
7ac6ab1f GN |
760 | |
761 | if (session->pwtype != L2TP_PWTYPE_PPP) { | |
762 | error = -EPROTOTYPE; | |
763 | goto end; | |
764 | } | |
765 | ||
dbdbc73b GN |
766 | ps = l2tp_session_priv(session); |
767 | ||
768 | /* Using a pre-existing session is fine as long as it hasn't | |
769 | * been connected yet. | |
309795f4 | 770 | */ |
ee40fb2e GN |
771 | mutex_lock(&ps->sk_lock); |
772 | if (rcu_dereference_protected(ps->sk, | |
3d609342 GN |
773 | lockdep_is_held(&ps->sk_lock)) || |
774 | ps->__sk) { | |
ee40fb2e | 775 | mutex_unlock(&ps->sk_lock); |
dbdbc73b GN |
776 | error = -EEXIST; |
777 | goto end; | |
778 | } | |
309795f4 | 779 | } else { |
90904ff5 | 780 | cfg.pw_type = L2TP_PWTYPE_PPP; |
309795f4 | 781 | |
dbdbc73b | 782 | session = l2tp_session_create(sizeof(struct pppol2tp_session), |
a408194a GN |
783 | tunnel, info.session_id, |
784 | info.peer_session_id, &cfg); | |
dbdbc73b GN |
785 | if (IS_ERR(session)) { |
786 | error = PTR_ERR(session); | |
309795f4 | 787 | goto end; |
dbdbc73b | 788 | } |
3953ae7b | 789 | |
f98be6c6 | 790 | pppol2tp_session_init(session); |
ee40fb2e | 791 | ps = l2tp_session_priv(session); |
3953ae7b | 792 | l2tp_session_inc_refcount(session); |
ee40fb2e GN |
793 | |
794 | mutex_lock(&ps->sk_lock); | |
3953ae7b GN |
795 | error = l2tp_session_register(session, tunnel); |
796 | if (error < 0) { | |
ee40fb2e | 797 | mutex_unlock(&ps->sk_lock); |
3953ae7b GN |
798 | kfree(session); |
799 | goto end; | |
800 | } | |
801 | drop_refcnt = true; | |
bda06be2 | 802 | new_session = true; |
fd558d18 JC |
803 | } |
804 | ||
fd558d18 JC |
805 | /* Special case: if source & dest session_id == 0x0000, this |
806 | * socket is being created to manage the tunnel. Just set up | |
807 | * the internal context for use by ioctl() and sockopt() | |
808 | * handlers. | |
809 | */ | |
810 | if ((session->session_id == 0) && | |
811 | (session->peer_session_id == 0)) { | |
812 | error = 0; | |
813 | goto out_no_ppp; | |
814 | } | |
815 | ||
816 | /* The only header we need to worry about is the L2TP | |
817 | * header. This size is different depending on whether | |
818 | * sequence numbers are enabled for the data channel. | |
819 | */ | |
820 | po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
821 | ||
822 | po->chan.private = sk; | |
823 | po->chan.ops = &pppol2tp_chan_ops; | |
789141b2 | 824 | po->chan.mtu = pppol2tp_tunnel_mtu(tunnel); |
fd558d18 JC |
825 | |
826 | error = ppp_register_net_channel(sock_net(sk), &po->chan); | |
ee40fb2e GN |
827 | if (error) { |
828 | mutex_unlock(&ps->sk_lock); | |
fd558d18 | 829 | goto end; |
ee40fb2e | 830 | } |
fd558d18 JC |
831 | |
832 | out_no_ppp: | |
833 | /* This is how we get the session context from the socket. */ | |
834 | sk->sk_user_data = session; | |
ee40fb2e GN |
835 | rcu_assign_pointer(ps->sk, sk); |
836 | mutex_unlock(&ps->sk_lock); | |
837 | ||
f98be6c6 GN |
838 | /* Keep the reference we've grabbed on the session: sk doesn't expect |
839 | * the session to disappear. pppol2tp_session_destruct() is responsible | |
840 | * for dropping it. | |
841 | */ | |
842 | drop_refcnt = false; | |
843 | ||
fd558d18 | 844 | sk->sk_state = PPPOX_CONNECTED; |
fba40c63 | 845 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: created\n", |
a4ca44fa | 846 | session->name); |
fd558d18 JC |
847 | |
848 | end: | |
bda06be2 GN |
849 | if (error) { |
850 | if (new_session) | |
851 | l2tp_session_delete(session); | |
852 | if (new_tunnel) | |
853 | l2tp_tunnel_delete(tunnel); | |
854 | } | |
dbdbc73b GN |
855 | if (drop_refcnt) |
856 | l2tp_session_dec_refcount(session); | |
f9e56baf GN |
857 | if (drop_tunnel) |
858 | l2tp_tunnel_dec_refcount(tunnel); | |
fd558d18 JC |
859 | release_sock(sk); |
860 | ||
861 | return error; | |
862 | } | |
863 | ||
309795f4 JC |
864 | #ifdef CONFIG_L2TP_V3 |
865 | ||
f026bc29 GN |
866 | /* Called when creating sessions via the netlink interface. */ |
867 | static int pppol2tp_session_create(struct net *net, struct l2tp_tunnel *tunnel, | |
868 | u32 session_id, u32 peer_session_id, | |
869 | struct l2tp_session_cfg *cfg) | |
309795f4 JC |
870 | { |
871 | int error; | |
309795f4 | 872 | struct l2tp_session *session; |
309795f4 | 873 | |
309795f4 | 874 | /* Error if tunnel socket is not prepped */ |
f026bc29 GN |
875 | if (!tunnel->sock) { |
876 | error = -ENOENT; | |
3953ae7b | 877 | goto err; |
f026bc29 | 878 | } |
309795f4 | 879 | |
309795f4 | 880 | /* Allocate and initialize a new session context. */ |
309795f4 JC |
881 | session = l2tp_session_create(sizeof(struct pppol2tp_session), |
882 | tunnel, session_id, | |
883 | peer_session_id, cfg); | |
dbdbc73b GN |
884 | if (IS_ERR(session)) { |
885 | error = PTR_ERR(session); | |
3953ae7b | 886 | goto err; |
dbdbc73b | 887 | } |
309795f4 | 888 | |
f98be6c6 | 889 | pppol2tp_session_init(session); |
309795f4 | 890 | |
3953ae7b GN |
891 | error = l2tp_session_register(session, tunnel); |
892 | if (error < 0) | |
893 | goto err_sess; | |
309795f4 | 894 | |
3953ae7b | 895 | return 0; |
309795f4 | 896 | |
3953ae7b GN |
897 | err_sess: |
898 | kfree(session); | |
899 | err: | |
309795f4 JC |
900 | return error; |
901 | } | |
902 | ||
309795f4 JC |
903 | #endif /* CONFIG_L2TP_V3 */ |
904 | ||
fd558d18 JC |
905 | /* getname() support. |
906 | */ | |
907 | static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr, | |
9b2c45d4 | 908 | int peer) |
fd558d18 | 909 | { |
e0d4435f | 910 | int len = 0; |
fd558d18 JC |
911 | int error = 0; |
912 | struct l2tp_session *session; | |
913 | struct l2tp_tunnel *tunnel; | |
914 | struct sock *sk = sock->sk; | |
915 | struct inet_sock *inet; | |
916 | struct pppol2tp_session *pls; | |
917 | ||
918 | error = -ENOTCONN; | |
919 | if (sk == NULL) | |
920 | goto end; | |
56cff471 | 921 | if (!(sk->sk_state & PPPOX_CONNECTED)) |
fd558d18 JC |
922 | goto end; |
923 | ||
924 | error = -EBADF; | |
925 | session = pppol2tp_sock_to_session(sk); | |
926 | if (session == NULL) | |
927 | goto end; | |
928 | ||
929 | pls = l2tp_session_priv(session); | |
7198c77a | 930 | tunnel = session->tunnel; |
fd558d18 | 931 | |
bbdb32cb | 932 | inet = inet_sk(tunnel->sock); |
d2cf3361 | 933 | if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) { |
e0d4435f JC |
934 | struct sockaddr_pppol2tp sp; |
935 | len = sizeof(sp); | |
936 | memset(&sp, 0, len); | |
937 | sp.sa_family = AF_PPPOX; | |
938 | sp.sa_protocol = PX_PROTO_OL2TP; | |
939 | sp.pppol2tp.fd = tunnel->fd; | |
940 | sp.pppol2tp.pid = pls->owner; | |
941 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
942 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
943 | sp.pppol2tp.s_session = session->session_id; | |
944 | sp.pppol2tp.d_session = session->peer_session_id; | |
945 | sp.pppol2tp.addr.sin_family = AF_INET; | |
946 | sp.pppol2tp.addr.sin_port = inet->inet_dport; | |
947 | sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr; | |
948 | memcpy(uaddr, &sp, len); | |
d2cf3361 BL |
949 | #if IS_ENABLED(CONFIG_IPV6) |
950 | } else if ((tunnel->version == 2) && | |
951 | (tunnel->sock->sk_family == AF_INET6)) { | |
d2cf3361 | 952 | struct sockaddr_pppol2tpin6 sp; |
efe4208f | 953 | |
d2cf3361 BL |
954 | len = sizeof(sp); |
955 | memset(&sp, 0, len); | |
956 | sp.sa_family = AF_PPPOX; | |
957 | sp.sa_protocol = PX_PROTO_OL2TP; | |
958 | sp.pppol2tp.fd = tunnel->fd; | |
959 | sp.pppol2tp.pid = pls->owner; | |
960 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
961 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
962 | sp.pppol2tp.s_session = session->session_id; | |
963 | sp.pppol2tp.d_session = session->peer_session_id; | |
964 | sp.pppol2tp.addr.sin6_family = AF_INET6; | |
965 | sp.pppol2tp.addr.sin6_port = inet->inet_dport; | |
efe4208f ED |
966 | memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr, |
967 | sizeof(tunnel->sock->sk_v6_daddr)); | |
d2cf3361 BL |
968 | memcpy(uaddr, &sp, len); |
969 | } else if ((tunnel->version == 3) && | |
970 | (tunnel->sock->sk_family == AF_INET6)) { | |
d2cf3361 | 971 | struct sockaddr_pppol2tpv3in6 sp; |
efe4208f | 972 | |
d2cf3361 BL |
973 | len = sizeof(sp); |
974 | memset(&sp, 0, len); | |
975 | sp.sa_family = AF_PPPOX; | |
976 | sp.sa_protocol = PX_PROTO_OL2TP; | |
977 | sp.pppol2tp.fd = tunnel->fd; | |
978 | sp.pppol2tp.pid = pls->owner; | |
979 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
980 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
981 | sp.pppol2tp.s_session = session->session_id; | |
982 | sp.pppol2tp.d_session = session->peer_session_id; | |
983 | sp.pppol2tp.addr.sin6_family = AF_INET6; | |
984 | sp.pppol2tp.addr.sin6_port = inet->inet_dport; | |
efe4208f ED |
985 | memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr, |
986 | sizeof(tunnel->sock->sk_v6_daddr)); | |
d2cf3361 BL |
987 | memcpy(uaddr, &sp, len); |
988 | #endif | |
e0d4435f JC |
989 | } else if (tunnel->version == 3) { |
990 | struct sockaddr_pppol2tpv3 sp; | |
991 | len = sizeof(sp); | |
992 | memset(&sp, 0, len); | |
993 | sp.sa_family = AF_PPPOX; | |
994 | sp.sa_protocol = PX_PROTO_OL2TP; | |
995 | sp.pppol2tp.fd = tunnel->fd; | |
996 | sp.pppol2tp.pid = pls->owner; | |
997 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
998 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
999 | sp.pppol2tp.s_session = session->session_id; | |
1000 | sp.pppol2tp.d_session = session->peer_session_id; | |
1001 | sp.pppol2tp.addr.sin_family = AF_INET; | |
1002 | sp.pppol2tp.addr.sin_port = inet->inet_dport; | |
1003 | sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr; | |
1004 | memcpy(uaddr, &sp, len); | |
1005 | } | |
fd558d18 | 1006 | |
9b2c45d4 | 1007 | error = len; |
fd558d18 | 1008 | |
fd558d18 | 1009 | sock_put(sk); |
fd558d18 JC |
1010 | end: |
1011 | return error; | |
1012 | } | |
1013 | ||
1014 | /**************************************************************************** | |
1015 | * ioctl() handlers. | |
1016 | * | |
1017 | * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP | |
1018 | * sockets. However, in order to control kernel tunnel features, we allow | |
1019 | * userspace to create a special "tunnel" PPPoX socket which is used for | |
1020 | * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow | |
1021 | * the user application to issue L2TP setsockopt(), getsockopt() and ioctl() | |
1022 | * calls. | |
1023 | ****************************************************************************/ | |
1024 | ||
1025 | static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest, | |
7390ed8a | 1026 | const struct l2tp_stats *stats) |
fd558d18 | 1027 | { |
7390ed8a GN |
1028 | memset(dest, 0, sizeof(*dest)); |
1029 | ||
7b7c0719 TP |
1030 | dest->tx_packets = atomic_long_read(&stats->tx_packets); |
1031 | dest->tx_bytes = atomic_long_read(&stats->tx_bytes); | |
1032 | dest->tx_errors = atomic_long_read(&stats->tx_errors); | |
1033 | dest->rx_packets = atomic_long_read(&stats->rx_packets); | |
1034 | dest->rx_bytes = atomic_long_read(&stats->rx_bytes); | |
1035 | dest->rx_seq_discards = atomic_long_read(&stats->rx_seq_discards); | |
1036 | dest->rx_oos_packets = atomic_long_read(&stats->rx_oos_packets); | |
1037 | dest->rx_errors = atomic_long_read(&stats->rx_errors); | |
fd558d18 JC |
1038 | } |
1039 | ||
528534f0 GN |
1040 | static int pppol2tp_tunnel_copy_stats(struct pppol2tp_ioc_stats *stats, |
1041 | struct l2tp_tunnel *tunnel) | |
1042 | { | |
1043 | struct l2tp_session *session; | |
1044 | ||
1045 | if (!stats->session_id) { | |
528534f0 GN |
1046 | pppol2tp_copy_stats(stats, &tunnel->stats); |
1047 | return 0; | |
1048 | } | |
1049 | ||
1050 | /* If session_id is set, search the corresponding session in the | |
1051 | * context of this tunnel and record the session's statistics. | |
1052 | */ | |
1053 | session = l2tp_tunnel_get_session(tunnel, stats->session_id); | |
1054 | if (!session) | |
1055 | return -EBADR; | |
1056 | ||
1057 | if (session->pwtype != L2TP_PWTYPE_PPP) { | |
1058 | l2tp_session_dec_refcount(session); | |
1059 | return -EBADR; | |
1060 | } | |
1061 | ||
528534f0 GN |
1062 | pppol2tp_copy_stats(stats, &session->stats); |
1063 | l2tp_session_dec_refcount(session); | |
1064 | ||
1065 | return 0; | |
1066 | } | |
1067 | ||
fd558d18 JC |
1068 | static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd, |
1069 | unsigned long arg) | |
1070 | { | |
528534f0 | 1071 | struct pppol2tp_ioc_stats stats; |
fd558d18 | 1072 | struct l2tp_session *session; |
79e6760e GN |
1073 | int val; |
1074 | ||
1075 | switch (cmd) { | |
1076 | case PPPIOCGMRU: | |
1077 | case PPPIOCGFLAGS: | |
1078 | session = sock->sk->sk_user_data; | |
1079 | if (!session) | |
1080 | return -ENOTCONN; | |
fd558d18 | 1081 | |
79e6760e GN |
1082 | /* Not defined for tunnels */ |
1083 | if (!session->session_id && !session->peer_session_id) | |
1084 | return -ENOSYS; | |
fd558d18 | 1085 | |
79e6760e GN |
1086 | if (put_user(0, (int __user *)arg)) |
1087 | return -EFAULT; | |
1088 | break; | |
1089 | ||
1090 | case PPPIOCSMRU: | |
1091 | case PPPIOCSFLAGS: | |
1092 | session = sock->sk->sk_user_data; | |
1093 | if (!session) | |
1094 | return -ENOTCONN; | |
fd558d18 | 1095 | |
79e6760e GN |
1096 | /* Not defined for tunnels */ |
1097 | if (!session->session_id && !session->peer_session_id) | |
1098 | return -ENOSYS; | |
1099 | ||
1100 | if (get_user(val, (int __user *)arg)) | |
1101 | return -EFAULT; | |
1102 | break; | |
1103 | ||
1104 | case PPPIOCGL2TPSTATS: | |
1105 | session = sock->sk->sk_user_data; | |
1106 | if (!session) | |
1107 | return -ENOTCONN; | |
1108 | ||
1109 | /* Session 0 represents the parent tunnel */ | |
528534f0 GN |
1110 | if (!session->session_id && !session->peer_session_id) { |
1111 | u32 session_id; | |
1112 | int err; | |
1113 | ||
1114 | if (copy_from_user(&stats, (void __user *)arg, | |
1115 | sizeof(stats))) | |
1116 | return -EFAULT; | |
1117 | ||
1118 | session_id = stats.session_id; | |
1119 | err = pppol2tp_tunnel_copy_stats(&stats, | |
1120 | session->tunnel); | |
1121 | if (err < 0) | |
1122 | return err; | |
1123 | ||
1124 | stats.session_id = session_id; | |
1125 | } else { | |
b0e29063 GN |
1126 | pppol2tp_copy_stats(&stats, &session->stats); |
1127 | stats.session_id = session->session_id; | |
528534f0 GN |
1128 | } |
1129 | stats.tunnel_id = session->tunnel->tunnel_id; | |
1130 | stats.using_ipsec = l2tp_tunnel_uses_xfrm(session->tunnel); | |
1131 | ||
1132 | if (copy_to_user((void __user *)arg, &stats, sizeof(stats))) | |
1133 | return -EFAULT; | |
79e6760e GN |
1134 | break; |
1135 | ||
1136 | default: | |
4f5f85e9 | 1137 | return -ENOIOCTLCMD; |
bdd0292f | 1138 | } |
fd558d18 | 1139 | |
79e6760e | 1140 | return 0; |
fd558d18 JC |
1141 | } |
1142 | ||
1143 | /***************************************************************************** | |
1144 | * setsockopt() / getsockopt() support. | |
1145 | * | |
1146 | * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP | |
1147 | * sockets. In order to control kernel tunnel features, we allow userspace to | |
1148 | * create a special "tunnel" PPPoX socket which is used for control only. | |
1149 | * Tunnel PPPoX sockets have session_id == 0 and simply allow the user | |
1150 | * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls. | |
1151 | *****************************************************************************/ | |
1152 | ||
1153 | /* Tunnel setsockopt() helper. | |
1154 | */ | |
1155 | static int pppol2tp_tunnel_setsockopt(struct sock *sk, | |
1156 | struct l2tp_tunnel *tunnel, | |
1157 | int optname, int val) | |
1158 | { | |
1159 | int err = 0; | |
1160 | ||
1161 | switch (optname) { | |
1162 | case PPPOL2TP_SO_DEBUG: | |
1163 | tunnel->debug = val; | |
fba40c63 | 1164 | l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: set debug=%x\n", |
a4ca44fa | 1165 | tunnel->name, tunnel->debug); |
fd558d18 JC |
1166 | break; |
1167 | ||
1168 | default: | |
1169 | err = -ENOPROTOOPT; | |
1170 | break; | |
1171 | } | |
1172 | ||
1173 | return err; | |
1174 | } | |
1175 | ||
1176 | /* Session setsockopt helper. | |
1177 | */ | |
1178 | static int pppol2tp_session_setsockopt(struct sock *sk, | |
1179 | struct l2tp_session *session, | |
1180 | int optname, int val) | |
1181 | { | |
1182 | int err = 0; | |
fd558d18 JC |
1183 | |
1184 | switch (optname) { | |
1185 | case PPPOL2TP_SO_RECVSEQ: | |
1186 | if ((val != 0) && (val != 1)) { | |
1187 | err = -EINVAL; | |
1188 | break; | |
1189 | } | |
3f9b9770 | 1190 | session->recv_seq = !!val; |
fba40c63 | 1191 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa JP |
1192 | "%s: set recv_seq=%d\n", |
1193 | session->name, session->recv_seq); | |
fd558d18 JC |
1194 | break; |
1195 | ||
1196 | case PPPOL2TP_SO_SENDSEQ: | |
1197 | if ((val != 0) && (val != 1)) { | |
1198 | err = -EINVAL; | |
1199 | break; | |
1200 | } | |
3f9b9770 | 1201 | session->send_seq = !!val; |
fd558d18 | 1202 | { |
ee40fb2e GN |
1203 | struct pppox_sock *po = pppox_sk(sk); |
1204 | ||
fd558d18 JC |
1205 | po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ : |
1206 | PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
1207 | } | |
bb5016ea | 1208 | l2tp_session_set_header_len(session, session->tunnel->version); |
fba40c63 | 1209 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa JP |
1210 | "%s: set send_seq=%d\n", |
1211 | session->name, session->send_seq); | |
fd558d18 JC |
1212 | break; |
1213 | ||
1214 | case PPPOL2TP_SO_LNSMODE: | |
1215 | if ((val != 0) && (val != 1)) { | |
1216 | err = -EINVAL; | |
1217 | break; | |
1218 | } | |
3f9b9770 | 1219 | session->lns_mode = !!val; |
fba40c63 | 1220 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa JP |
1221 | "%s: set lns_mode=%d\n", |
1222 | session->name, session->lns_mode); | |
fd558d18 JC |
1223 | break; |
1224 | ||
1225 | case PPPOL2TP_SO_DEBUG: | |
1226 | session->debug = val; | |
fba40c63 | 1227 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: set debug=%x\n", |
a4ca44fa | 1228 | session->name, session->debug); |
fd558d18 JC |
1229 | break; |
1230 | ||
1231 | case PPPOL2TP_SO_REORDERTO: | |
1232 | session->reorder_timeout = msecs_to_jiffies(val); | |
fba40c63 | 1233 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa JP |
1234 | "%s: set reorder_timeout=%d\n", |
1235 | session->name, session->reorder_timeout); | |
fd558d18 JC |
1236 | break; |
1237 | ||
1238 | default: | |
1239 | err = -ENOPROTOOPT; | |
1240 | break; | |
1241 | } | |
1242 | ||
1243 | return err; | |
1244 | } | |
1245 | ||
1246 | /* Main setsockopt() entry point. | |
1247 | * Does API checks, then calls either the tunnel or session setsockopt | |
1248 | * handler, according to whether the PPPoL2TP socket is a for a regular | |
1249 | * session or the special tunnel type. | |
1250 | */ | |
1251 | static int pppol2tp_setsockopt(struct socket *sock, int level, int optname, | |
1252 | char __user *optval, unsigned int optlen) | |
1253 | { | |
1254 | struct sock *sk = sock->sk; | |
1255 | struct l2tp_session *session; | |
1256 | struct l2tp_tunnel *tunnel; | |
fd558d18 JC |
1257 | int val; |
1258 | int err; | |
1259 | ||
1260 | if (level != SOL_PPPOL2TP) | |
3cf521f7 | 1261 | return -EINVAL; |
fd558d18 JC |
1262 | |
1263 | if (optlen < sizeof(int)) | |
1264 | return -EINVAL; | |
1265 | ||
1266 | if (get_user(val, (int __user *)optval)) | |
1267 | return -EFAULT; | |
1268 | ||
1269 | err = -ENOTCONN; | |
1270 | if (sk->sk_user_data == NULL) | |
1271 | goto end; | |
1272 | ||
1273 | /* Get session context from the socket */ | |
1274 | err = -EBADF; | |
1275 | session = pppol2tp_sock_to_session(sk); | |
1276 | if (session == NULL) | |
1277 | goto end; | |
1278 | ||
1279 | /* Special case: if session_id == 0x0000, treat as operation on tunnel | |
1280 | */ | |
fd558d18 JC |
1281 | if ((session->session_id == 0) && |
1282 | (session->peer_session_id == 0)) { | |
7198c77a | 1283 | tunnel = session->tunnel; |
fd558d18 | 1284 | err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val); |
7198c77a | 1285 | } else { |
fd558d18 | 1286 | err = pppol2tp_session_setsockopt(sk, session, optname, val); |
7198c77a | 1287 | } |
fd558d18 | 1288 | |
fd558d18 JC |
1289 | sock_put(sk); |
1290 | end: | |
1291 | return err; | |
1292 | } | |
1293 | ||
1294 | /* Tunnel getsockopt helper. Called with sock locked. | |
1295 | */ | |
1296 | static int pppol2tp_tunnel_getsockopt(struct sock *sk, | |
1297 | struct l2tp_tunnel *tunnel, | |
1298 | int optname, int *val) | |
1299 | { | |
1300 | int err = 0; | |
1301 | ||
1302 | switch (optname) { | |
1303 | case PPPOL2TP_SO_DEBUG: | |
1304 | *val = tunnel->debug; | |
fba40c63 | 1305 | l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get debug=%x\n", |
a4ca44fa | 1306 | tunnel->name, tunnel->debug); |
fd558d18 JC |
1307 | break; |
1308 | ||
1309 | default: | |
1310 | err = -ENOPROTOOPT; | |
1311 | break; | |
1312 | } | |
1313 | ||
1314 | return err; | |
1315 | } | |
1316 | ||
1317 | /* Session getsockopt helper. Called with sock locked. | |
1318 | */ | |
1319 | static int pppol2tp_session_getsockopt(struct sock *sk, | |
1320 | struct l2tp_session *session, | |
1321 | int optname, int *val) | |
1322 | { | |
1323 | int err = 0; | |
1324 | ||
1325 | switch (optname) { | |
1326 | case PPPOL2TP_SO_RECVSEQ: | |
1327 | *val = session->recv_seq; | |
fba40c63 | 1328 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa | 1329 | "%s: get recv_seq=%d\n", session->name, *val); |
fd558d18 JC |
1330 | break; |
1331 | ||
1332 | case PPPOL2TP_SO_SENDSEQ: | |
1333 | *val = session->send_seq; | |
fba40c63 | 1334 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa | 1335 | "%s: get send_seq=%d\n", session->name, *val); |
fd558d18 JC |
1336 | break; |
1337 | ||
1338 | case PPPOL2TP_SO_LNSMODE: | |
1339 | *val = session->lns_mode; | |
fba40c63 | 1340 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa | 1341 | "%s: get lns_mode=%d\n", session->name, *val); |
fd558d18 JC |
1342 | break; |
1343 | ||
1344 | case PPPOL2TP_SO_DEBUG: | |
1345 | *val = session->debug; | |
fba40c63 | 1346 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: get debug=%d\n", |
a4ca44fa | 1347 | session->name, *val); |
fd558d18 JC |
1348 | break; |
1349 | ||
1350 | case PPPOL2TP_SO_REORDERTO: | |
1351 | *val = (int) jiffies_to_msecs(session->reorder_timeout); | |
fba40c63 | 1352 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa | 1353 | "%s: get reorder_timeout=%d\n", session->name, *val); |
fd558d18 JC |
1354 | break; |
1355 | ||
1356 | default: | |
1357 | err = -ENOPROTOOPT; | |
1358 | } | |
1359 | ||
1360 | return err; | |
1361 | } | |
1362 | ||
1363 | /* Main getsockopt() entry point. | |
1364 | * Does API checks, then calls either the tunnel or session getsockopt | |
1365 | * handler, according to whether the PPPoX socket is a for a regular session | |
1366 | * or the special tunnel type. | |
1367 | */ | |
e3192690 JP |
1368 | static int pppol2tp_getsockopt(struct socket *sock, int level, int optname, |
1369 | char __user *optval, int __user *optlen) | |
fd558d18 JC |
1370 | { |
1371 | struct sock *sk = sock->sk; | |
1372 | struct l2tp_session *session; | |
1373 | struct l2tp_tunnel *tunnel; | |
1374 | int val, len; | |
1375 | int err; | |
fd558d18 JC |
1376 | |
1377 | if (level != SOL_PPPOL2TP) | |
3cf521f7 | 1378 | return -EINVAL; |
fd558d18 | 1379 | |
e3192690 | 1380 | if (get_user(len, optlen)) |
fd558d18 JC |
1381 | return -EFAULT; |
1382 | ||
1383 | len = min_t(unsigned int, len, sizeof(int)); | |
1384 | ||
1385 | if (len < 0) | |
1386 | return -EINVAL; | |
1387 | ||
1388 | err = -ENOTCONN; | |
1389 | if (sk->sk_user_data == NULL) | |
1390 | goto end; | |
1391 | ||
1392 | /* Get the session context */ | |
1393 | err = -EBADF; | |
1394 | session = pppol2tp_sock_to_session(sk); | |
1395 | if (session == NULL) | |
1396 | goto end; | |
1397 | ||
1398 | /* Special case: if session_id == 0x0000, treat as operation on tunnel */ | |
fd558d18 JC |
1399 | if ((session->session_id == 0) && |
1400 | (session->peer_session_id == 0)) { | |
7198c77a | 1401 | tunnel = session->tunnel; |
fd558d18 | 1402 | err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val); |
321a52a3 GN |
1403 | if (err) |
1404 | goto end_put_sess; | |
1405 | } else { | |
fd558d18 | 1406 | err = pppol2tp_session_getsockopt(sk, session, optname, &val); |
321a52a3 GN |
1407 | if (err) |
1408 | goto end_put_sess; | |
1409 | } | |
fd558d18 JC |
1410 | |
1411 | err = -EFAULT; | |
e3192690 | 1412 | if (put_user(len, optlen)) |
fd558d18 JC |
1413 | goto end_put_sess; |
1414 | ||
1415 | if (copy_to_user((void __user *) optval, &val, len)) | |
1416 | goto end_put_sess; | |
1417 | ||
1418 | err = 0; | |
1419 | ||
1420 | end_put_sess: | |
1421 | sock_put(sk); | |
1422 | end: | |
1423 | return err; | |
1424 | } | |
1425 | ||
1426 | /***************************************************************************** | |
1427 | * /proc filesystem for debug | |
f7faffa3 JC |
1428 | * Since the original pppol2tp driver provided /proc/net/pppol2tp for |
1429 | * L2TPv2, we dump only L2TPv2 tunnels and sessions here. | |
fd558d18 JC |
1430 | *****************************************************************************/ |
1431 | ||
1432 | static unsigned int pppol2tp_net_id; | |
1433 | ||
1434 | #ifdef CONFIG_PROC_FS | |
1435 | ||
1436 | struct pppol2tp_seq_data { | |
1437 | struct seq_net_private p; | |
1438 | int tunnel_idx; /* current tunnel */ | |
1439 | int session_idx; /* index of session within current tunnel */ | |
1440 | struct l2tp_tunnel *tunnel; | |
1441 | struct l2tp_session *session; /* NULL means get next tunnel */ | |
1442 | }; | |
1443 | ||
1444 | static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd) | |
1445 | { | |
0e0c3fee GN |
1446 | /* Drop reference taken during previous invocation */ |
1447 | if (pd->tunnel) | |
1448 | l2tp_tunnel_dec_refcount(pd->tunnel); | |
1449 | ||
f7faffa3 | 1450 | for (;;) { |
0e0c3fee | 1451 | pd->tunnel = l2tp_tunnel_get_nth(net, pd->tunnel_idx); |
f7faffa3 JC |
1452 | pd->tunnel_idx++; |
1453 | ||
0e0c3fee GN |
1454 | /* Only accept L2TPv2 tunnels */ |
1455 | if (!pd->tunnel || pd->tunnel->version == 2) | |
1456 | return; | |
f7faffa3 | 1457 | |
0e0c3fee | 1458 | l2tp_tunnel_dec_refcount(pd->tunnel); |
f7faffa3 | 1459 | } |
fd558d18 JC |
1460 | } |
1461 | ||
1462 | static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd) | |
1463 | { | |
83494407 GN |
1464 | /* Drop reference taken during previous invocation */ |
1465 | if (pd->session) | |
1466 | l2tp_session_dec_refcount(pd->session); | |
1467 | ||
a4346210 | 1468 | pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx); |
fd558d18 | 1469 | pd->session_idx++; |
f7faffa3 | 1470 | |
fd558d18 JC |
1471 | if (pd->session == NULL) { |
1472 | pd->session_idx = 0; | |
1473 | pppol2tp_next_tunnel(net, pd); | |
1474 | } | |
1475 | } | |
1476 | ||
1477 | static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs) | |
1478 | { | |
1479 | struct pppol2tp_seq_data *pd = SEQ_START_TOKEN; | |
1480 | loff_t pos = *offs; | |
1481 | struct net *net; | |
1482 | ||
1483 | if (!pos) | |
1484 | goto out; | |
1485 | ||
1486 | BUG_ON(m->private == NULL); | |
1487 | pd = m->private; | |
1488 | net = seq_file_net(m); | |
1489 | ||
1490 | if (pd->tunnel == NULL) | |
1491 | pppol2tp_next_tunnel(net, pd); | |
1492 | else | |
1493 | pppol2tp_next_session(net, pd); | |
1494 | ||
1495 | /* NULL tunnel and session indicates end of list */ | |
1496 | if ((pd->tunnel == NULL) && (pd->session == NULL)) | |
1497 | pd = NULL; | |
1498 | ||
1499 | out: | |
1500 | return pd; | |
1501 | } | |
1502 | ||
1503 | static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
1504 | { | |
1505 | (*pos)++; | |
1506 | return NULL; | |
1507 | } | |
1508 | ||
1509 | static void pppol2tp_seq_stop(struct seq_file *p, void *v) | |
1510 | { | |
0e0c3fee GN |
1511 | struct pppol2tp_seq_data *pd = v; |
1512 | ||
1513 | if (!pd || pd == SEQ_START_TOKEN) | |
1514 | return; | |
1515 | ||
83494407 GN |
1516 | /* Drop reference taken by last invocation of pppol2tp_next_session() |
1517 | * or pppol2tp_next_tunnel(). | |
1518 | */ | |
1519 | if (pd->session) { | |
1520 | l2tp_session_dec_refcount(pd->session); | |
1521 | pd->session = NULL; | |
1522 | } | |
5411b618 | 1523 | if (pd->tunnel) { |
0e0c3fee | 1524 | l2tp_tunnel_dec_refcount(pd->tunnel); |
5411b618 | 1525 | pd->tunnel = NULL; |
5411b618 | 1526 | } |
fd558d18 JC |
1527 | } |
1528 | ||
1529 | static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v) | |
1530 | { | |
1531 | struct l2tp_tunnel *tunnel = v; | |
1532 | ||
1533 | seq_printf(m, "\nTUNNEL '%s', %c %d\n", | |
1534 | tunnel->name, | |
1535 | (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N', | |
fbea9e07 | 1536 | refcount_read(&tunnel->ref_count) - 1); |
7b7c0719 | 1537 | seq_printf(m, " %08x %ld/%ld/%ld %ld/%ld/%ld\n", |
fd558d18 | 1538 | tunnel->debug, |
7b7c0719 TP |
1539 | atomic_long_read(&tunnel->stats.tx_packets), |
1540 | atomic_long_read(&tunnel->stats.tx_bytes), | |
1541 | atomic_long_read(&tunnel->stats.tx_errors), | |
1542 | atomic_long_read(&tunnel->stats.rx_packets), | |
1543 | atomic_long_read(&tunnel->stats.rx_bytes), | |
1544 | atomic_long_read(&tunnel->stats.rx_errors)); | |
fd558d18 JC |
1545 | } |
1546 | ||
1547 | static void pppol2tp_seq_session_show(struct seq_file *m, void *v) | |
1548 | { | |
1549 | struct l2tp_session *session = v; | |
1550 | struct l2tp_tunnel *tunnel = session->tunnel; | |
ee40fb2e GN |
1551 | unsigned char state; |
1552 | char user_data_ok; | |
1553 | struct sock *sk; | |
fd558d18 JC |
1554 | u32 ip = 0; |
1555 | u16 port = 0; | |
1556 | ||
1557 | if (tunnel->sock) { | |
1558 | struct inet_sock *inet = inet_sk(tunnel->sock); | |
1559 | ip = ntohl(inet->inet_saddr); | |
1560 | port = ntohs(inet->inet_sport); | |
1561 | } | |
1562 | ||
ee40fb2e GN |
1563 | sk = pppol2tp_session_get_sock(session); |
1564 | if (sk) { | |
1565 | state = sk->sk_state; | |
1566 | user_data_ok = (session == sk->sk_user_data) ? 'Y' : 'N'; | |
1567 | } else { | |
1568 | state = 0; | |
1569 | user_data_ok = 'N'; | |
1570 | } | |
1571 | ||
fd558d18 JC |
1572 | seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> " |
1573 | "%04X/%04X %d %c\n", | |
1574 | session->name, ip, port, | |
1575 | tunnel->tunnel_id, | |
1576 | session->session_id, | |
1577 | tunnel->peer_tunnel_id, | |
1578 | session->peer_session_id, | |
ee40fb2e | 1579 | state, user_data_ok); |
789141b2 | 1580 | seq_printf(m, " 0/0/%c/%c/%s %08x %u\n", |
fd558d18 JC |
1581 | session->recv_seq ? 'R' : '-', |
1582 | session->send_seq ? 'S' : '-', | |
1583 | session->lns_mode ? "LNS" : "LAC", | |
1584 | session->debug, | |
1585 | jiffies_to_msecs(session->reorder_timeout)); | |
7b7c0719 | 1586 | seq_printf(m, " %hu/%hu %ld/%ld/%ld %ld/%ld/%ld\n", |
fd558d18 | 1587 | session->nr, session->ns, |
7b7c0719 TP |
1588 | atomic_long_read(&session->stats.tx_packets), |
1589 | atomic_long_read(&session->stats.tx_bytes), | |
1590 | atomic_long_read(&session->stats.tx_errors), | |
1591 | atomic_long_read(&session->stats.rx_packets), | |
1592 | atomic_long_read(&session->stats.rx_bytes), | |
1593 | atomic_long_read(&session->stats.rx_errors)); | |
9345471b | 1594 | |
ee40fb2e GN |
1595 | if (sk) { |
1596 | struct pppox_sock *po = pppox_sk(sk); | |
1597 | ||
9345471b | 1598 | seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan)); |
ee40fb2e GN |
1599 | sock_put(sk); |
1600 | } | |
fd558d18 JC |
1601 | } |
1602 | ||
1603 | static int pppol2tp_seq_show(struct seq_file *m, void *v) | |
1604 | { | |
1605 | struct pppol2tp_seq_data *pd = v; | |
1606 | ||
1607 | /* display header on line 1 */ | |
1608 | if (v == SEQ_START_TOKEN) { | |
1609 | seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n"); | |
1610 | seq_puts(m, "TUNNEL name, user-data-ok session-count\n"); | |
1611 | seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
1612 | seq_puts(m, " SESSION name, addr/port src-tid/sid " | |
1613 | "dest-tid/sid state user-data-ok\n"); | |
1614 | seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n"); | |
1615 | seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
1616 | goto out; | |
1617 | } | |
1618 | ||
83494407 | 1619 | if (!pd->session) |
fd558d18 | 1620 | pppol2tp_seq_tunnel_show(m, pd->tunnel); |
83494407 | 1621 | else |
fd558d18 JC |
1622 | pppol2tp_seq_session_show(m, pd->session); |
1623 | ||
1624 | out: | |
1625 | return 0; | |
1626 | } | |
1627 | ||
1628 | static const struct seq_operations pppol2tp_seq_ops = { | |
1629 | .start = pppol2tp_seq_start, | |
1630 | .next = pppol2tp_seq_next, | |
1631 | .stop = pppol2tp_seq_stop, | |
1632 | .show = pppol2tp_seq_show, | |
1633 | }; | |
fd558d18 JC |
1634 | #endif /* CONFIG_PROC_FS */ |
1635 | ||
1636 | /***************************************************************************** | |
1637 | * Network namespace | |
1638 | *****************************************************************************/ | |
1639 | ||
1640 | static __net_init int pppol2tp_init_net(struct net *net) | |
1641 | { | |
1642 | struct proc_dir_entry *pde; | |
1643 | int err = 0; | |
1644 | ||
c3506372 CH |
1645 | pde = proc_create_net("pppol2tp", 0444, net->proc_net, |
1646 | &pppol2tp_seq_ops, sizeof(struct pppol2tp_seq_data)); | |
fd558d18 JC |
1647 | if (!pde) { |
1648 | err = -ENOMEM; | |
1649 | goto out; | |
1650 | } | |
1651 | ||
1652 | out: | |
1653 | return err; | |
1654 | } | |
1655 | ||
1656 | static __net_exit void pppol2tp_exit_net(struct net *net) | |
1657 | { | |
ece31ffd | 1658 | remove_proc_entry("pppol2tp", net->proc_net); |
fd558d18 JC |
1659 | } |
1660 | ||
1661 | static struct pernet_operations pppol2tp_net_ops = { | |
1662 | .init = pppol2tp_init_net, | |
1663 | .exit = pppol2tp_exit_net, | |
1664 | .id = &pppol2tp_net_id, | |
1665 | }; | |
1666 | ||
1667 | /***************************************************************************** | |
1668 | * Init and cleanup | |
1669 | *****************************************************************************/ | |
1670 | ||
1671 | static const struct proto_ops pppol2tp_ops = { | |
1672 | .family = AF_PPPOX, | |
1673 | .owner = THIS_MODULE, | |
1674 | .release = pppol2tp_release, | |
1675 | .bind = sock_no_bind, | |
1676 | .connect = pppol2tp_connect, | |
1677 | .socketpair = sock_no_socketpair, | |
1678 | .accept = sock_no_accept, | |
1679 | .getname = pppol2tp_getname, | |
a11e1d43 | 1680 | .poll = datagram_poll, |
fd558d18 JC |
1681 | .listen = sock_no_listen, |
1682 | .shutdown = sock_no_shutdown, | |
1683 | .setsockopt = pppol2tp_setsockopt, | |
1684 | .getsockopt = pppol2tp_getsockopt, | |
1685 | .sendmsg = pppol2tp_sendmsg, | |
1686 | .recvmsg = pppol2tp_recvmsg, | |
1687 | .mmap = sock_no_mmap, | |
1688 | .ioctl = pppox_ioctl, | |
1689 | }; | |
1690 | ||
756e64a0 | 1691 | static const struct pppox_proto pppol2tp_proto = { |
fd558d18 | 1692 | .create = pppol2tp_create, |
e1558a93 WY |
1693 | .ioctl = pppol2tp_ioctl, |
1694 | .owner = THIS_MODULE, | |
fd558d18 JC |
1695 | }; |
1696 | ||
309795f4 JC |
1697 | #ifdef CONFIG_L2TP_V3 |
1698 | ||
1699 | static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = { | |
1700 | .session_create = pppol2tp_session_create, | |
cf2f5c88 | 1701 | .session_delete = l2tp_session_delete, |
309795f4 JC |
1702 | }; |
1703 | ||
1704 | #endif /* CONFIG_L2TP_V3 */ | |
1705 | ||
fd558d18 JC |
1706 | static int __init pppol2tp_init(void) |
1707 | { | |
1708 | int err; | |
1709 | ||
1710 | err = register_pernet_device(&pppol2tp_net_ops); | |
1711 | if (err) | |
1712 | goto out; | |
1713 | ||
1714 | err = proto_register(&pppol2tp_sk_proto, 0); | |
1715 | if (err) | |
1716 | goto out_unregister_pppol2tp_pernet; | |
1717 | ||
1718 | err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto); | |
1719 | if (err) | |
1720 | goto out_unregister_pppol2tp_proto; | |
1721 | ||
309795f4 JC |
1722 | #ifdef CONFIG_L2TP_V3 |
1723 | err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops); | |
1724 | if (err) | |
1725 | goto out_unregister_pppox; | |
1726 | #endif | |
1727 | ||
a4ca44fa | 1728 | pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION); |
fd558d18 JC |
1729 | |
1730 | out: | |
1731 | return err; | |
309795f4 JC |
1732 | |
1733 | #ifdef CONFIG_L2TP_V3 | |
1734 | out_unregister_pppox: | |
1735 | unregister_pppox_proto(PX_PROTO_OL2TP); | |
1736 | #endif | |
fd558d18 JC |
1737 | out_unregister_pppol2tp_proto: |
1738 | proto_unregister(&pppol2tp_sk_proto); | |
1739 | out_unregister_pppol2tp_pernet: | |
1740 | unregister_pernet_device(&pppol2tp_net_ops); | |
1741 | goto out; | |
1742 | } | |
1743 | ||
1744 | static void __exit pppol2tp_exit(void) | |
1745 | { | |
309795f4 JC |
1746 | #ifdef CONFIG_L2TP_V3 |
1747 | l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP); | |
1748 | #endif | |
fd558d18 JC |
1749 | unregister_pppox_proto(PX_PROTO_OL2TP); |
1750 | proto_unregister(&pppol2tp_sk_proto); | |
1751 | unregister_pernet_device(&pppol2tp_net_ops); | |
1752 | } | |
1753 | ||
1754 | module_init(pppol2tp_init); | |
1755 | module_exit(pppol2tp_exit); | |
1756 | ||
1757 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); | |
1758 | MODULE_DESCRIPTION("PPP over L2TP over UDP"); | |
1759 | MODULE_LICENSE("GPL"); | |
1760 | MODULE_VERSION(PPPOL2TP_DRV_VERSION); | |
681b4d88 | 1761 | MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_OL2TP); |
249ee819 | 1762 | MODULE_ALIAS_L2TP_PWTYPE(7); |