blob: cc52b98747fd57ec889d5c1f0bcc821da385e60d [file] [log] [blame]
James Chapmanfd558d12010-04-02 06:18:33 +00001/*****************************************************************************
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
Joe Perchesa4ca44f2012-05-16 09:55:56 +000060#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
61
James Chapmanfd558d12010-04-02 06:18:33 +000062#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>
Paul Mackerras4b32da2b2012-03-04 12:56:55 +000087#include <linux/ppp-ioctl.h>
James Chapmanfd558d12010-04-02 06:18:33 +000088#include <linux/file.h>
89#include <linux/hash.h>
90#include <linux/sort.h>
91#include <linux/proc_fs.h>
James Chapman309795f2010-04-02 06:19:10 +000092#include <linux/l2tp.h>
James Chapmanfd558d12010-04-02 06:18:33 +000093#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>
Tom Parkincf2f5c82013-03-19 06:11:21 +0000100#include <net/inet_common.h>
James Chapmanfd558d12010-04-02 06:18:33 +0000101
102#include <asm/byteorder.h>
Arun Sharma600634972011-07-26 16:09:06 -0700103#include <linux/atomic.h>
James Chapmanfd558d12010-04-02 06:18:33 +0000104
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
James Chapmanfd558d12010-04-02 06:18:33 +0000112/* 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 */
122struct 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
133static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb);
134
stephen hemmingerd7100da2010-08-04 07:34:36 +0000135static const struct ppp_channel_ops pppol2tp_chan_ops = {
136 .start_xmit = pppol2tp_xmit,
137};
138
James Chapmanfd558d12010-04-02 06:18:33 +0000139static const struct proto_ops pppol2tp_ops;
140
141/* Helpers to obtain tunnel/session contexts from sockets.
142 */
143static 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
159out:
160 return session;
161}
162
163/*****************************************************************************
164 * Receive data handling
165 *****************************************************************************/
166
James Chapmanfd558d12010-04-02 06:18:33 +0000167/* Receive message. This is the recvmsg for the PPPoL2TP socket.
168 */
Ying Xue1b784142015-03-02 15:37:48 +0800169static int pppol2tp_recvmsg(struct socket *sock, struct msghdr *msg,
170 size_t len, int flags)
James Chapmanfd558d12010-04-02 06:18:33 +0000171{
172 int err;
173 struct sk_buff *skb;
174 struct sock *sk = sock->sk;
175
176 err = -EIO;
177 if (sk->sk_state & PPPOX_BOUND)
178 goto end;
179
James Chapmanfd558d12010-04-02 06:18:33 +0000180 err = 0;
181 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
182 flags & MSG_DONTWAIT, &err);
183 if (!skb)
184 goto end;
185
186 if (len > skb->len)
187 len = skb->len;
188 else if (len < skb->len)
189 msg->msg_flags |= MSG_TRUNC;
190
David S. Miller51f3d022014-11-05 16:46:40 -0500191 err = skb_copy_datagram_msg(skb, 0, msg, len);
James Chapmanfd558d12010-04-02 06:18:33 +0000192 if (likely(err == 0))
193 err = len;
194
195 kfree_skb(skb);
196end:
197 return err;
198}
199
200static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
201{
202 struct pppol2tp_session *ps = l2tp_session_priv(session);
203 struct sock *sk = NULL;
204
205 /* If the socket is bound, send it in to PPP's input queue. Otherwise
206 * queue it on the session socket.
207 */
208 sk = ps->sock;
209 if (sk == NULL)
210 goto no_sock;
211
Guillaume Nault9532aa62018-07-25 14:53:33 +0200212 /* If the first two bytes are 0xFF03, consider that it is the PPP's
213 * Address and Control fields and skip them. The L2TP module has always
214 * worked this way, although, in theory, the use of these fields should
215 * be negociated and handled at the PPP layer. These fields are
216 * constant: 0xFF is the All-Stations Address and 0x03 the Unnumbered
217 * Information command with Poll/Final bit set to zero (RFC 1662).
218 */
219 if (pskb_may_pull(skb, 2) && skb->data[0] == PPP_ALLSTATIONS &&
220 skb->data[1] == PPP_UI)
221 skb_pull(skb, 2);
222
James Chapmanfd558d12010-04-02 06:18:33 +0000223 if (sk->sk_state & PPPOX_BOUND) {
224 struct pppox_sock *po;
Guillaume Nault98f40b32015-12-29 13:06:59 +0100225
Joe Perchesa4ca44f2012-05-16 09:55:56 +0000226 l2tp_dbg(session, PPPOL2TP_MSG_DATA,
227 "%s: recv %d byte data frame, passing to ppp\n",
228 session->name, data_len);
James Chapmanfd558d12010-04-02 06:18:33 +0000229
James Chapmanfd558d12010-04-02 06:18:33 +0000230 po = pppox_sk(sk);
231 ppp_input(&po->chan, skb);
232 } else {
Guillaume Nault9e9cb622014-03-06 11:15:10 +0100233 l2tp_dbg(session, PPPOL2TP_MSG_DATA,
234 "%s: recv %d byte data frame, passing to L2TP socket\n",
235 session->name, data_len);
James Chapmanfd558d12010-04-02 06:18:33 +0000236
Guillaume Nault9e9cb622014-03-06 11:15:10 +0100237 if (sock_queue_rcv_skb(sk, skb) < 0) {
238 atomic_long_inc(&session->stats.rx_errors);
239 kfree_skb(skb);
240 }
James Chapmanfd558d12010-04-02 06:18:33 +0000241 }
242
243 return;
244
245no_sock:
Joe Perchesa4ca44f2012-05-16 09:55:56 +0000246 l2tp_info(session, PPPOL2TP_MSG_DATA, "%s: no socket\n", session->name);
James Chapmanfd558d12010-04-02 06:18:33 +0000247 kfree_skb(skb);
248}
249
250static void pppol2tp_session_sock_hold(struct l2tp_session *session)
251{
252 struct pppol2tp_session *ps = l2tp_session_priv(session);
253
254 if (ps->sock)
255 sock_hold(ps->sock);
256}
257
258static void pppol2tp_session_sock_put(struct l2tp_session *session)
259{
260 struct pppol2tp_session *ps = l2tp_session_priv(session);
261
262 if (ps->sock)
263 sock_put(ps->sock);
264}
265
266/************************************************************************
267 * Transmit handling
268 ***********************************************************************/
269
James Chapmanfd558d12010-04-02 06:18:33 +0000270/* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here
271 * when a user application does a sendmsg() on the session socket. L2TP and
272 * PPP headers must be inserted into the user's data.
273 */
Ying Xue1b784142015-03-02 15:37:48 +0800274static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m,
James Chapmanfd558d12010-04-02 06:18:33 +0000275 size_t total_len)
276{
James Chapmanfd558d12010-04-02 06:18:33 +0000277 struct sock *sk = sock->sk;
278 struct sk_buff *skb;
279 int error;
280 struct l2tp_session *session;
281 struct l2tp_tunnel *tunnel;
282 struct pppol2tp_session *ps;
James Chapman0d767512010-04-02 06:19:00 +0000283 int uhlen;
James Chapmanfd558d12010-04-02 06:18:33 +0000284
285 error = -ENOTCONN;
286 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
287 goto error;
288
289 /* Get session and tunnel contexts */
290 error = -EBADF;
291 session = pppol2tp_sock_to_session(sk);
292 if (session == NULL)
293 goto error;
294
295 ps = l2tp_session_priv(session);
296 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
297 if (tunnel == NULL)
298 goto error_put_sess;
299
James Chapman0d767512010-04-02 06:19:00 +0000300 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
301
James Chapmanfd558d12010-04-02 06:18:33 +0000302 /* Allocate a socket buffer */
303 error = -ENOMEM;
304 skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) +
James Chapman0d767512010-04-02 06:19:00 +0000305 uhlen + session->hdr_len +
Gao Feng54c151d2016-08-22 22:50:02 +0800306 2 + total_len, /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */
James Chapmanfd558d12010-04-02 06:18:33 +0000307 0, GFP_KERNEL);
308 if (!skb)
309 goto error_put_sess_tun;
310
311 /* Reserve space for headers. */
312 skb_reserve(skb, NET_SKB_PAD);
313 skb_reset_network_header(skb);
314 skb_reserve(skb, sizeof(struct iphdr));
315 skb_reset_transport_header(skb);
James Chapman0d767512010-04-02 06:19:00 +0000316 skb_reserve(skb, uhlen);
James Chapmanfd558d12010-04-02 06:18:33 +0000317
318 /* Add PPP header */
Gao Feng54c151d2016-08-22 22:50:02 +0800319 skb->data[0] = PPP_ALLSTATIONS;
320 skb->data[1] = PPP_UI;
James Chapmanfd558d12010-04-02 06:18:33 +0000321 skb_put(skb, 2);
322
323 /* Copy user data into skb */
Al Viro6ce8e9c2014-04-06 21:25:44 -0400324 error = memcpy_from_msg(skb_put(skb, total_len), m, total_len);
James Chapmanfd558d12010-04-02 06:18:33 +0000325 if (error < 0) {
326 kfree_skb(skb);
327 goto error_put_sess_tun;
328 }
James Chapmanfd558d12010-04-02 06:18:33 +0000329
Eric Dumazet455cc322013-10-10 06:30:09 -0700330 local_bh_disable();
James Chapmanfd558d12010-04-02 06:18:33 +0000331 l2tp_xmit_skb(session, skb, session->hdr_len);
Eric Dumazet455cc322013-10-10 06:30:09 -0700332 local_bh_enable();
James Chapmanfd558d12010-04-02 06:18:33 +0000333
334 sock_put(ps->tunnel_sock);
Guillaume Nault8b82547e33e2013-03-01 05:02:02 +0000335 sock_put(sk);
James Chapmanfd558d12010-04-02 06:18:33 +0000336
Guillaume Naulta6f79d02013-06-12 16:07:36 +0200337 return total_len;
James Chapmanfd558d12010-04-02 06:18:33 +0000338
339error_put_sess_tun:
340 sock_put(ps->tunnel_sock);
341error_put_sess:
342 sock_put(sk);
343error:
344 return error;
345}
346
347/* Transmit function called by generic PPP driver. Sends PPP frame
348 * over PPPoL2TP socket.
349 *
350 * This is almost the same as pppol2tp_sendmsg(), but rather than
351 * being called with a msghdr from userspace, it is called with a skb
352 * from the kernel.
353 *
354 * The supplied skb from ppp doesn't have enough headroom for the
355 * insertion of L2TP, UDP and IP headers so we need to allocate more
356 * headroom in the skb. This will create a cloned skb. But we must be
357 * careful in the error case because the caller will expect to free
358 * the skb it supplied, not our cloned skb. So we take care to always
359 * leave the original skb unfreed if we return an error.
360 */
361static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
362{
James Chapmanfd558d12010-04-02 06:18:33 +0000363 struct sock *sk = (struct sock *) chan->private;
364 struct sock *sk_tun;
James Chapmanfd558d12010-04-02 06:18:33 +0000365 struct l2tp_session *session;
366 struct l2tp_tunnel *tunnel;
367 struct pppol2tp_session *ps;
Eric Dumazet09df57c2011-10-07 05:45:57 +0000368 int uhlen, headroom;
James Chapmanfd558d12010-04-02 06:18:33 +0000369
370 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
371 goto abort;
372
373 /* Get session and tunnel contexts from the socket */
374 session = pppol2tp_sock_to_session(sk);
375 if (session == NULL)
376 goto abort;
377
378 ps = l2tp_session_priv(session);
379 sk_tun = ps->tunnel_sock;
380 if (sk_tun == NULL)
381 goto abort_put_sess;
382 tunnel = l2tp_sock_to_tunnel(sk_tun);
383 if (tunnel == NULL)
384 goto abort_put_sess;
385
Eric Dumazet09df57c2011-10-07 05:45:57 +0000386 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
387 headroom = NET_SKB_PAD +
388 sizeof(struct iphdr) + /* IP header */
389 uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */
390 session->hdr_len + /* L2TP header */
Gao Feng54c151d2016-08-22 22:50:02 +0800391 2; /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */
Eric Dumazet09df57c2011-10-07 05:45:57 +0000392 if (skb_cow_head(skb, headroom))
James Chapmanfd558d12010-04-02 06:18:33 +0000393 goto abort_put_sess_tun;
394
James Chapmanfd558d12010-04-02 06:18:33 +0000395 /* Setup PPP header */
Gao Feng54c151d2016-08-22 22:50:02 +0800396 __skb_push(skb, 2);
397 skb->data[0] = PPP_ALLSTATIONS;
398 skb->data[1] = PPP_UI;
James Chapmanfd558d12010-04-02 06:18:33 +0000399
Eric Dumazet455cc322013-10-10 06:30:09 -0700400 local_bh_disable();
James Chapmane0d44352010-04-02 06:18:54 +0000401 l2tp_xmit_skb(session, skb, session->hdr_len);
Eric Dumazet455cc322013-10-10 06:30:09 -0700402 local_bh_enable();
James Chapmanfd558d12010-04-02 06:18:33 +0000403
404 sock_put(sk_tun);
405 sock_put(sk);
406 return 1;
407
408abort_put_sess_tun:
409 sock_put(sk_tun);
410abort_put_sess:
411 sock_put(sk);
412abort:
413 /* Free the original skb */
414 kfree_skb(skb);
415 return 1;
416}
417
418/*****************************************************************************
419 * Session (and tunnel control) socket create/destroy.
420 *****************************************************************************/
421
422/* Called by l2tp_core when a session socket is being closed.
423 */
424static void pppol2tp_session_close(struct l2tp_session *session)
425{
426 struct pppol2tp_session *ps = l2tp_session_priv(session);
427 struct sock *sk = ps->sock;
Tom Parkincf2f5c82013-03-19 06:11:21 +0000428 struct socket *sock = sk->sk_socket;
James Chapmanfd558d12010-04-02 06:18:33 +0000429
430 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
431
Tom Parkincf2f5c82013-03-19 06:11:21 +0000432 if (sock) {
Gao Feng54c151d2016-08-22 22:50:02 +0800433 inet_shutdown(sock, SEND_SHUTDOWN);
Tom Parkincf2f5c82013-03-19 06:11:21 +0000434 /* Don't let the session go away before our socket does */
435 l2tp_session_inc_refcount(session);
James Chapmanfd558d12010-04-02 06:18:33 +0000436 }
James Chapmanfd558d12010-04-02 06:18:33 +0000437}
438
439/* Really kill the session socket. (Called from sock_put() if
440 * refcnt == 0.)
441 */
442static void pppol2tp_session_destruct(struct sock *sk)
443{
Tom Parkinf6e16b22013-03-19 06:11:23 +0000444 struct l2tp_session *session = sk->sk_user_data;
Guillaume Nault3ae0fc92017-03-29 08:45:29 +0200445
446 skb_queue_purge(&sk->sk_receive_queue);
447 skb_queue_purge(&sk->sk_write_queue);
448
Tom Parkinf6e16b22013-03-19 06:11:23 +0000449 if (session) {
James Chapmanfd558d12010-04-02 06:18:33 +0000450 sk->sk_user_data = NULL;
451 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
452 l2tp_session_dec_refcount(session);
453 }
James Chapmanfd558d12010-04-02 06:18:33 +0000454}
455
456/* Called when the PPPoX socket (session) is closed.
457 */
458static int pppol2tp_release(struct socket *sock)
459{
460 struct sock *sk = sock->sk;
461 struct l2tp_session *session;
462 int error;
463
464 if (!sk)
465 return 0;
466
467 error = -EBADF;
468 lock_sock(sk);
469 if (sock_flag(sk, SOCK_DEAD) != 0)
470 goto error;
471
472 pppox_unbind_sock(sk);
473
474 /* Signal the death of the socket. */
475 sk->sk_state = PPPOX_DEAD;
476 sock_orphan(sk);
477 sock->sk = NULL;
478
479 session = pppol2tp_sock_to_session(sk);
480
481 /* Purge any queued data */
James Chapmanfd558d12010-04-02 06:18:33 +0000482 if (session != NULL) {
Tom Parkinf6e16b22013-03-19 06:11:23 +0000483 __l2tp_session_unhash(session);
Tom Parkincf2f5c82013-03-19 06:11:21 +0000484 l2tp_session_queue_purge(session);
James Chapmanfd558d12010-04-02 06:18:33 +0000485 sock_put(sk);
486 }
James Chapmanfd558d12010-04-02 06:18:33 +0000487 release_sock(sk);
488
489 /* This will delete the session context via
490 * pppol2tp_session_destruct() if the socket's refcnt drops to
491 * zero.
492 */
493 sock_put(sk);
494
495 return 0;
496
497error:
498 release_sock(sk);
499 return error;
500}
501
502static struct proto pppol2tp_sk_proto = {
503 .name = "PPPOL2TP",
504 .owner = THIS_MODULE,
505 .obj_size = sizeof(struct pppox_sock),
506};
507
508static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb)
509{
510 int rc;
511
512 rc = l2tp_udp_encap_recv(sk, skb);
513 if (rc)
514 kfree_skb(skb);
515
516 return NET_RX_SUCCESS;
517}
518
519/* socket() handler. Initialize a new struct sock.
520 */
Eric W. Biederman11aa9c22015-05-08 21:09:13 -0500521static int pppol2tp_create(struct net *net, struct socket *sock, int kern)
James Chapmanfd558d12010-04-02 06:18:33 +0000522{
523 int error = -ENOMEM;
524 struct sock *sk;
525
Eric W. Biederman11aa9c22015-05-08 21:09:13 -0500526 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto, kern);
James Chapmanfd558d12010-04-02 06:18:33 +0000527 if (!sk)
528 goto out;
529
530 sock_init_data(sock, sk);
531
532 sock->state = SS_UNCONNECTED;
533 sock->ops = &pppol2tp_ops;
534
535 sk->sk_backlog_rcv = pppol2tp_backlog_recv;
536 sk->sk_protocol = PX_PROTO_OL2TP;
537 sk->sk_family = PF_PPPOX;
538 sk->sk_state = PPPOX_NONE;
539 sk->sk_type = SOCK_STREAM;
540 sk->sk_destruct = pppol2tp_session_destruct;
541
542 error = 0;
543
544out:
545 return error;
546}
547
Javier Martinez Canillas9dd79942016-09-09 08:43:17 -0400548#if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
James Chapman0ad66142010-04-02 06:19:33 +0000549static void pppol2tp_show(struct seq_file *m, void *arg)
550{
551 struct l2tp_session *session = arg;
552 struct pppol2tp_session *ps = l2tp_session_priv(session);
553
554 if (ps) {
555 struct pppox_sock *po = pppox_sk(ps->sock);
556 if (po)
557 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
558 }
559}
560#endif
561
James Chapmanfd558d12010-04-02 06:18:33 +0000562/* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
563 */
564static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
565 int sockaddr_len, int flags)
566{
567 struct sock *sk = sock->sk;
568 struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr;
569 struct pppox_sock *po = pppox_sk(sk);
570 struct l2tp_session *session = NULL;
571 struct l2tp_tunnel *tunnel;
572 struct pppol2tp_session *ps;
573 struct dst_entry *dst;
574 struct l2tp_session_cfg cfg = { 0, };
575 int error = 0;
James Chapmane0d44352010-04-02 06:18:54 +0000576 u32 tunnel_id, peer_tunnel_id;
577 u32 session_id, peer_session_id;
Guillaume Naultd9face62017-03-31 13:02:27 +0200578 bool drop_refcnt = false;
James Chapmane0d44352010-04-02 06:18:54 +0000579 int ver = 2;
580 int fd;
James Chapmanfd558d12010-04-02 06:18:33 +0000581
582 lock_sock(sk);
583
584 error = -EINVAL;
Guillaume Naulte9c46602018-04-23 16:15:14 +0200585
586 if (sockaddr_len != sizeof(struct sockaddr_pppol2tp) &&
587 sockaddr_len != sizeof(struct sockaddr_pppol2tpv3) &&
588 sockaddr_len != sizeof(struct sockaddr_pppol2tpin6) &&
589 sockaddr_len != sizeof(struct sockaddr_pppol2tpv3in6))
590 goto end;
591
James Chapmanfd558d12010-04-02 06:18:33 +0000592 if (sp->sa_protocol != PX_PROTO_OL2TP)
593 goto end;
594
595 /* Check for already bound sockets */
596 error = -EBUSY;
597 if (sk->sk_state & PPPOX_CONNECTED)
598 goto end;
599
600 /* We don't supporting rebinding anyway */
601 error = -EALREADY;
602 if (sk->sk_user_data)
603 goto end; /* socket is already attached */
604
James Chapmanb79585f2012-04-29 21:48:50 +0000605 /* Get params from socket address. Handle L2TPv2 and L2TPv3.
606 * This is nasty because there are different sockaddr_pppol2tp
607 * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use
608 * the sockaddr size to determine which structure the caller
609 * is using.
610 */
611 peer_tunnel_id = 0;
James Chapmane0d44352010-04-02 06:18:54 +0000612 if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) {
613 fd = sp->pppol2tp.fd;
614 tunnel_id = sp->pppol2tp.s_tunnel;
615 peer_tunnel_id = sp->pppol2tp.d_tunnel;
616 session_id = sp->pppol2tp.s_session;
617 peer_session_id = sp->pppol2tp.d_session;
618 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) {
James Chapmanb79585f2012-04-29 21:48:50 +0000619 struct sockaddr_pppol2tpv3 *sp3 =
620 (struct sockaddr_pppol2tpv3 *) sp;
James Chapmane0d44352010-04-02 06:18:54 +0000621 ver = 3;
622 fd = sp3->pppol2tp.fd;
623 tunnel_id = sp3->pppol2tp.s_tunnel;
624 peer_tunnel_id = sp3->pppol2tp.d_tunnel;
625 session_id = sp3->pppol2tp.s_session;
626 peer_session_id = sp3->pppol2tp.d_session;
James Chapmanb79585f2012-04-29 21:48:50 +0000627 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpin6)) {
628 struct sockaddr_pppol2tpin6 *sp6 =
629 (struct sockaddr_pppol2tpin6 *) sp;
630 fd = sp6->pppol2tp.fd;
631 tunnel_id = sp6->pppol2tp.s_tunnel;
632 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
633 session_id = sp6->pppol2tp.s_session;
634 peer_session_id = sp6->pppol2tp.d_session;
635 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3in6)) {
636 struct sockaddr_pppol2tpv3in6 *sp6 =
637 (struct sockaddr_pppol2tpv3in6 *) sp;
638 ver = 3;
639 fd = sp6->pppol2tp.fd;
640 tunnel_id = sp6->pppol2tp.s_tunnel;
641 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
642 session_id = sp6->pppol2tp.s_session;
643 peer_session_id = sp6->pppol2tp.d_session;
James Chapmane0d44352010-04-02 06:18:54 +0000644 } else {
645 error = -EINVAL;
646 goto end; /* bad socket address */
647 }
648
649 /* Don't bind if tunnel_id is 0 */
James Chapmanfd558d12010-04-02 06:18:33 +0000650 error = -EINVAL;
James Chapmane0d44352010-04-02 06:18:54 +0000651 if (tunnel_id == 0)
James Chapmanfd558d12010-04-02 06:18:33 +0000652 goto end;
653
James Chapman309795f2010-04-02 06:19:10 +0000654 tunnel = l2tp_tunnel_find(sock_net(sk), tunnel_id);
655
James Chapmane0d44352010-04-02 06:18:54 +0000656 /* Special case: create tunnel context if session_id and
657 * peer_session_id is 0. Otherwise look up tunnel using supplied
James Chapmanfd558d12010-04-02 06:18:33 +0000658 * tunnel id.
659 */
James Chapmane0d44352010-04-02 06:18:54 +0000660 if ((session_id == 0) && (peer_session_id == 0)) {
James Chapman309795f2010-04-02 06:19:10 +0000661 if (tunnel == NULL) {
662 struct l2tp_tunnel_cfg tcfg = {
663 .encap = L2TP_ENCAPTYPE_UDP,
664 .debug = 0,
665 };
666 error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel);
667 if (error < 0)
668 goto end;
669 }
James Chapmanfd558d12010-04-02 06:18:33 +0000670 } else {
James Chapmanfd558d12010-04-02 06:18:33 +0000671 /* Error if we can't find the tunnel */
672 error = -ENOENT;
673 if (tunnel == NULL)
674 goto end;
675
676 /* Error if socket is not prepped */
677 if (tunnel->sock == NULL)
678 goto end;
679 }
680
James Chapmanb79585f2012-04-29 21:48:50 +0000681 if (tunnel->peer_tunnel_id == 0)
682 tunnel->peer_tunnel_id = peer_tunnel_id;
James Chapmanfd558d12010-04-02 06:18:33 +0000683
Guillaume Naultd9face62017-03-31 13:02:27 +0200684 session = l2tp_session_get(sock_net(sk), tunnel, session_id, false);
685 if (session) {
686 drop_refcnt = true;
687 ps = l2tp_session_priv(session);
James Chapman309795f2010-04-02 06:19:10 +0000688
Guillaume Naultd9face62017-03-31 13:02:27 +0200689 /* Using a pre-existing session is fine as long as it hasn't
690 * been connected yet.
691 */
692 if (ps->sock) {
693 error = -EEXIST;
694 goto end;
695 }
696
697 /* consistency checks */
698 if (ps->tunnel_sock != tunnel->sock) {
699 error = -EEXIST;
James Chapman309795f2010-04-02 06:19:10 +0000700 goto end;
701 }
702 } else {
Guillaume Naultd9face62017-03-31 13:02:27 +0200703 /* Default MTU must allow space for UDP/L2TP/PPP headers */
704 cfg.mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
705 cfg.mru = cfg.mtu;
James Chapman309795f2010-04-02 06:19:10 +0000706
Guillaume Naultd9face62017-03-31 13:02:27 +0200707 session = l2tp_session_create(sizeof(struct pppol2tp_session),
708 tunnel, session_id,
709 peer_session_id, &cfg);
710 if (IS_ERR(session)) {
711 error = PTR_ERR(session);
James Chapman309795f2010-04-02 06:19:10 +0000712 goto end;
Guillaume Naultd9face62017-03-31 13:02:27 +0200713 }
James Chapman309795f2010-04-02 06:19:10 +0000714 }
715
716 /* Associate session with its PPPoL2TP socket */
James Chapmanfd558d12010-04-02 06:18:33 +0000717 ps = l2tp_session_priv(session);
718 ps->owner = current->pid;
719 ps->sock = sk;
720 ps->tunnel_sock = tunnel->sock;
721
722 session->recv_skb = pppol2tp_recv;
723 session->session_close = pppol2tp_session_close;
Javier Martinez Canillas9dd79942016-09-09 08:43:17 -0400724#if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
James Chapman0ad66142010-04-02 06:19:33 +0000725 session->show = pppol2tp_show;
726#endif
James Chapmanfd558d12010-04-02 06:18:33 +0000727
728 /* We need to know each time a skb is dropped from the reorder
729 * queue.
730 */
731 session->ref = pppol2tp_session_sock_hold;
732 session->deref = pppol2tp_session_sock_put;
733
734 /* If PMTU discovery was enabled, use the MTU that was discovered */
Dmitry Petukhovf34c4a32014-04-09 02:23:20 +0600735 dst = sk_dst_get(tunnel->sock);
James Chapmanfd558d12010-04-02 06:18:33 +0000736 if (dst != NULL) {
Guillaume Naulteed4d832014-09-03 14:12:55 +0200737 u32 pmtu = dst_mtu(dst);
738
James Chapmanfd558d12010-04-02 06:18:33 +0000739 if (pmtu != 0)
740 session->mtu = session->mru = pmtu -
741 PPPOL2TP_HEADER_OVERHEAD;
742 dst_release(dst);
743 }
744
745 /* Special case: if source & dest session_id == 0x0000, this
746 * socket is being created to manage the tunnel. Just set up
747 * the internal context for use by ioctl() and sockopt()
748 * handlers.
749 */
750 if ((session->session_id == 0) &&
751 (session->peer_session_id == 0)) {
752 error = 0;
753 goto out_no_ppp;
754 }
755
756 /* The only header we need to worry about is the L2TP
757 * header. This size is different depending on whether
758 * sequence numbers are enabled for the data channel.
759 */
760 po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
761
762 po->chan.private = sk;
763 po->chan.ops = &pppol2tp_chan_ops;
764 po->chan.mtu = session->mtu;
765
766 error = ppp_register_net_channel(sock_net(sk), &po->chan);
767 if (error)
768 goto end;
769
770out_no_ppp:
771 /* This is how we get the session context from the socket. */
772 sk->sk_user_data = session;
773 sk->sk_state = PPPOX_CONNECTED;
Joe Perchesa4ca44f2012-05-16 09:55:56 +0000774 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: created\n",
775 session->name);
James Chapmanfd558d12010-04-02 06:18:33 +0000776
777end:
Guillaume Naultd9face62017-03-31 13:02:27 +0200778 if (drop_refcnt)
779 l2tp_session_dec_refcount(session);
James Chapmanfd558d12010-04-02 06:18:33 +0000780 release_sock(sk);
781
782 return error;
783}
784
James Chapman309795f2010-04-02 06:19:10 +0000785#ifdef CONFIG_L2TP_V3
786
787/* Called when creating sessions via the netlink interface.
788 */
789static int pppol2tp_session_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg)
790{
791 int error;
792 struct l2tp_tunnel *tunnel;
793 struct l2tp_session *session;
794 struct pppol2tp_session *ps;
795
796 tunnel = l2tp_tunnel_find(net, tunnel_id);
797
798 /* Error if we can't find the tunnel */
799 error = -ENOENT;
800 if (tunnel == NULL)
801 goto out;
802
803 /* Error if tunnel socket is not prepped */
804 if (tunnel->sock == NULL)
805 goto out;
806
James Chapman309795f2010-04-02 06:19:10 +0000807 /* Default MTU values. */
808 if (cfg->mtu == 0)
809 cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
810 if (cfg->mru == 0)
811 cfg->mru = cfg->mtu;
812
813 /* Allocate and initialize a new session context. */
James Chapman309795f2010-04-02 06:19:10 +0000814 session = l2tp_session_create(sizeof(struct pppol2tp_session),
815 tunnel, session_id,
816 peer_session_id, cfg);
Guillaume Naultd9face62017-03-31 13:02:27 +0200817 if (IS_ERR(session)) {
818 error = PTR_ERR(session);
James Chapman309795f2010-04-02 06:19:10 +0000819 goto out;
Guillaume Naultd9face62017-03-31 13:02:27 +0200820 }
James Chapman309795f2010-04-02 06:19:10 +0000821
822 ps = l2tp_session_priv(session);
823 ps->tunnel_sock = tunnel->sock;
824
Joe Perchesa4ca44f2012-05-16 09:55:56 +0000825 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: created\n",
826 session->name);
James Chapman309795f2010-04-02 06:19:10 +0000827
828 error = 0;
829
830out:
831 return error;
832}
833
James Chapman309795f2010-04-02 06:19:10 +0000834#endif /* CONFIG_L2TP_V3 */
835
James Chapmanfd558d12010-04-02 06:18:33 +0000836/* getname() support.
837 */
838static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
839 int *usockaddr_len, int peer)
840{
James Chapmane0d44352010-04-02 06:18:54 +0000841 int len = 0;
James Chapmanfd558d12010-04-02 06:18:33 +0000842 int error = 0;
843 struct l2tp_session *session;
844 struct l2tp_tunnel *tunnel;
845 struct sock *sk = sock->sk;
846 struct inet_sock *inet;
847 struct pppol2tp_session *pls;
848
849 error = -ENOTCONN;
850 if (sk == NULL)
851 goto end;
Gao Feng56cff472016-08-19 13:36:23 +0800852 if (!(sk->sk_state & PPPOX_CONNECTED))
James Chapmanfd558d12010-04-02 06:18:33 +0000853 goto end;
854
855 error = -EBADF;
856 session = pppol2tp_sock_to_session(sk);
857 if (session == NULL)
858 goto end;
859
860 pls = l2tp_session_priv(session);
861 tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock);
phil.turnbull@oracle.com4ac36a42016-07-26 15:14:35 -0400862 if (tunnel == NULL)
James Chapmanfd558d12010-04-02 06:18:33 +0000863 goto end_put_sess;
James Chapmanfd558d12010-04-02 06:18:33 +0000864
Benjamin LaHaisebbdb32c2012-03-20 03:57:54 +0000865 inet = inet_sk(tunnel->sock);
Benjamin LaHaised2cf3362012-04-27 08:24:18 +0000866 if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) {
James Chapmane0d44352010-04-02 06:18:54 +0000867 struct sockaddr_pppol2tp sp;
868 len = sizeof(sp);
869 memset(&sp, 0, len);
870 sp.sa_family = AF_PPPOX;
871 sp.sa_protocol = PX_PROTO_OL2TP;
872 sp.pppol2tp.fd = tunnel->fd;
873 sp.pppol2tp.pid = pls->owner;
874 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
875 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
876 sp.pppol2tp.s_session = session->session_id;
877 sp.pppol2tp.d_session = session->peer_session_id;
878 sp.pppol2tp.addr.sin_family = AF_INET;
879 sp.pppol2tp.addr.sin_port = inet->inet_dport;
880 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
881 memcpy(uaddr, &sp, len);
Benjamin LaHaised2cf3362012-04-27 08:24:18 +0000882#if IS_ENABLED(CONFIG_IPV6)
883 } else if ((tunnel->version == 2) &&
884 (tunnel->sock->sk_family == AF_INET6)) {
Benjamin LaHaised2cf3362012-04-27 08:24:18 +0000885 struct sockaddr_pppol2tpin6 sp;
Eric Dumazetefe42082013-10-03 15:42:29 -0700886
Benjamin LaHaised2cf3362012-04-27 08:24:18 +0000887 len = sizeof(sp);
888 memset(&sp, 0, len);
889 sp.sa_family = AF_PPPOX;
890 sp.sa_protocol = PX_PROTO_OL2TP;
891 sp.pppol2tp.fd = tunnel->fd;
892 sp.pppol2tp.pid = pls->owner;
893 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
894 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
895 sp.pppol2tp.s_session = session->session_id;
896 sp.pppol2tp.d_session = session->peer_session_id;
897 sp.pppol2tp.addr.sin6_family = AF_INET6;
898 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
Eric Dumazetefe42082013-10-03 15:42:29 -0700899 memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
900 sizeof(tunnel->sock->sk_v6_daddr));
Benjamin LaHaised2cf3362012-04-27 08:24:18 +0000901 memcpy(uaddr, &sp, len);
902 } else if ((tunnel->version == 3) &&
903 (tunnel->sock->sk_family == AF_INET6)) {
Benjamin LaHaised2cf3362012-04-27 08:24:18 +0000904 struct sockaddr_pppol2tpv3in6 sp;
Eric Dumazetefe42082013-10-03 15:42:29 -0700905
Benjamin LaHaised2cf3362012-04-27 08:24:18 +0000906 len = sizeof(sp);
907 memset(&sp, 0, len);
908 sp.sa_family = AF_PPPOX;
909 sp.sa_protocol = PX_PROTO_OL2TP;
910 sp.pppol2tp.fd = tunnel->fd;
911 sp.pppol2tp.pid = pls->owner;
912 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
913 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
914 sp.pppol2tp.s_session = session->session_id;
915 sp.pppol2tp.d_session = session->peer_session_id;
916 sp.pppol2tp.addr.sin6_family = AF_INET6;
917 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
Eric Dumazetefe42082013-10-03 15:42:29 -0700918 memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
919 sizeof(tunnel->sock->sk_v6_daddr));
Benjamin LaHaised2cf3362012-04-27 08:24:18 +0000920 memcpy(uaddr, &sp, len);
921#endif
James Chapmane0d44352010-04-02 06:18:54 +0000922 } else if (tunnel->version == 3) {
923 struct sockaddr_pppol2tpv3 sp;
924 len = sizeof(sp);
925 memset(&sp, 0, len);
926 sp.sa_family = AF_PPPOX;
927 sp.sa_protocol = PX_PROTO_OL2TP;
928 sp.pppol2tp.fd = tunnel->fd;
929 sp.pppol2tp.pid = pls->owner;
930 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
931 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
932 sp.pppol2tp.s_session = session->session_id;
933 sp.pppol2tp.d_session = session->peer_session_id;
934 sp.pppol2tp.addr.sin_family = AF_INET;
935 sp.pppol2tp.addr.sin_port = inet->inet_dport;
936 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
937 memcpy(uaddr, &sp, len);
938 }
James Chapmanfd558d12010-04-02 06:18:33 +0000939
940 *usockaddr_len = len;
phil.turnbull@oracle.com4ac36a42016-07-26 15:14:35 -0400941 error = 0;
James Chapmanfd558d12010-04-02 06:18:33 +0000942
943 sock_put(pls->tunnel_sock);
944end_put_sess:
945 sock_put(sk);
James Chapmanfd558d12010-04-02 06:18:33 +0000946end:
947 return error;
948}
949
950/****************************************************************************
951 * ioctl() handlers.
952 *
953 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
954 * sockets. However, in order to control kernel tunnel features, we allow
955 * userspace to create a special "tunnel" PPPoX socket which is used for
956 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
957 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
958 * calls.
959 ****************************************************************************/
960
961static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest,
962 struct l2tp_stats *stats)
963{
Tom Parkin7b7c0712013-03-19 06:11:22 +0000964 dest->tx_packets = atomic_long_read(&stats->tx_packets);
965 dest->tx_bytes = atomic_long_read(&stats->tx_bytes);
966 dest->tx_errors = atomic_long_read(&stats->tx_errors);
967 dest->rx_packets = atomic_long_read(&stats->rx_packets);
968 dest->rx_bytes = atomic_long_read(&stats->rx_bytes);
969 dest->rx_seq_discards = atomic_long_read(&stats->rx_seq_discards);
970 dest->rx_oos_packets = atomic_long_read(&stats->rx_oos_packets);
971 dest->rx_errors = atomic_long_read(&stats->rx_errors);
James Chapmanfd558d12010-04-02 06:18:33 +0000972}
973
974/* Session ioctl helper.
975 */
976static int pppol2tp_session_ioctl(struct l2tp_session *session,
977 unsigned int cmd, unsigned long arg)
978{
979 struct ifreq ifr;
980 int err = 0;
981 struct sock *sk;
982 int val = (int) arg;
983 struct pppol2tp_session *ps = l2tp_session_priv(session);
984 struct l2tp_tunnel *tunnel = session->tunnel;
985 struct pppol2tp_ioc_stats stats;
986
Joe Perchesa4ca44f2012-05-16 09:55:56 +0000987 l2tp_dbg(session, PPPOL2TP_MSG_CONTROL,
988 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
989 session->name, cmd, arg);
James Chapmanfd558d12010-04-02 06:18:33 +0000990
991 sk = ps->sock;
Guillaume Nault9075216b2017-10-13 19:22:35 +0200992 if (!sk)
993 return -EBADR;
994
James Chapmanfd558d12010-04-02 06:18:33 +0000995 sock_hold(sk);
996
997 switch (cmd) {
998 case SIOCGIFMTU:
999 err = -ENXIO;
1000 if (!(sk->sk_state & PPPOX_CONNECTED))
1001 break;
1002
1003 err = -EFAULT;
1004 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1005 break;
1006 ifr.ifr_mtu = session->mtu;
1007 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
1008 break;
1009
Joe Perchesa4ca44f2012-05-16 09:55:56 +00001010 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get mtu=%d\n",
1011 session->name, session->mtu);
James Chapmanfd558d12010-04-02 06:18:33 +00001012 err = 0;
1013 break;
1014
1015 case SIOCSIFMTU:
1016 err = -ENXIO;
1017 if (!(sk->sk_state & PPPOX_CONNECTED))
1018 break;
1019
1020 err = -EFAULT;
1021 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1022 break;
1023
1024 session->mtu = ifr.ifr_mtu;
1025
Joe Perchesa4ca44f2012-05-16 09:55:56 +00001026 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set mtu=%d\n",
1027 session->name, session->mtu);
James Chapmanfd558d12010-04-02 06:18:33 +00001028 err = 0;
1029 break;
1030
1031 case PPPIOCGMRU:
1032 err = -ENXIO;
1033 if (!(sk->sk_state & PPPOX_CONNECTED))
1034 break;
1035
1036 err = -EFAULT;
1037 if (put_user(session->mru, (int __user *) arg))
1038 break;
1039
Joe Perchesa4ca44f2012-05-16 09:55:56 +00001040 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get mru=%d\n",
1041 session->name, session->mru);
James Chapmanfd558d12010-04-02 06:18:33 +00001042 err = 0;
1043 break;
1044
1045 case PPPIOCSMRU:
1046 err = -ENXIO;
1047 if (!(sk->sk_state & PPPOX_CONNECTED))
1048 break;
1049
1050 err = -EFAULT;
1051 if (get_user(val, (int __user *) arg))
1052 break;
1053
1054 session->mru = val;
Joe Perchesa4ca44f2012-05-16 09:55:56 +00001055 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set mru=%d\n",
1056 session->name, session->mru);
James Chapmanfd558d12010-04-02 06:18:33 +00001057 err = 0;
1058 break;
1059
1060 case PPPIOCGFLAGS:
1061 err = -EFAULT;
1062 if (put_user(ps->flags, (int __user *) arg))
1063 break;
1064
Joe Perchesa4ca44f2012-05-16 09:55:56 +00001065 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get flags=%d\n",
1066 session->name, ps->flags);
James Chapmanfd558d12010-04-02 06:18:33 +00001067 err = 0;
1068 break;
1069
1070 case PPPIOCSFLAGS:
1071 err = -EFAULT;
1072 if (get_user(val, (int __user *) arg))
1073 break;
1074 ps->flags = val;
Joe Perchesa4ca44f2012-05-16 09:55:56 +00001075 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set flags=%d\n",
1076 session->name, ps->flags);
James Chapmanfd558d12010-04-02 06:18:33 +00001077 err = 0;
1078 break;
1079
1080 case PPPIOCGL2TPSTATS:
1081 err = -ENXIO;
1082 if (!(sk->sk_state & PPPOX_CONNECTED))
1083 break;
1084
1085 memset(&stats, 0, sizeof(stats));
1086 stats.tunnel_id = tunnel->tunnel_id;
1087 stats.session_id = session->session_id;
1088 pppol2tp_copy_stats(&stats, &session->stats);
1089 if (copy_to_user((void __user *) arg, &stats,
1090 sizeof(stats)))
1091 break;
Joe Perchesa4ca44f2012-05-16 09:55:56 +00001092 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1093 session->name);
James Chapmanfd558d12010-04-02 06:18:33 +00001094 err = 0;
1095 break;
1096
1097 default:
1098 err = -ENOSYS;
1099 break;
1100 }
1101
1102 sock_put(sk);
1103
1104 return err;
1105}
1106
1107/* Tunnel ioctl helper.
1108 *
1109 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1110 * specifies a session_id, the session ioctl handler is called. This allows an
1111 * application to retrieve session stats via a tunnel socket.
1112 */
1113static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
1114 unsigned int cmd, unsigned long arg)
1115{
1116 int err = 0;
1117 struct sock *sk;
1118 struct pppol2tp_ioc_stats stats;
1119
Joe Perchesa4ca44f2012-05-16 09:55:56 +00001120 l2tp_dbg(tunnel, PPPOL2TP_MSG_CONTROL,
1121 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1122 tunnel->name, cmd, arg);
James Chapmanfd558d12010-04-02 06:18:33 +00001123
1124 sk = tunnel->sock;
1125 sock_hold(sk);
1126
1127 switch (cmd) {
1128 case PPPIOCGL2TPSTATS:
1129 err = -ENXIO;
1130 if (!(sk->sk_state & PPPOX_CONNECTED))
1131 break;
1132
1133 if (copy_from_user(&stats, (void __user *) arg,
1134 sizeof(stats))) {
1135 err = -EFAULT;
1136 break;
1137 }
1138 if (stats.session_id != 0) {
1139 /* resend to session ioctl handler */
1140 struct l2tp_session *session =
Guillaume Nault806e9882017-03-31 13:02:26 +02001141 l2tp_session_get(sock_net(sk), tunnel,
1142 stats.session_id, true);
1143
1144 if (session) {
1145 err = pppol2tp_session_ioctl(session, cmd,
1146 arg);
1147 if (session->deref)
1148 session->deref(session);
1149 l2tp_session_dec_refcount(session);
1150 } else {
James Chapmanfd558d12010-04-02 06:18:33 +00001151 err = -EBADR;
Guillaume Nault806e9882017-03-31 13:02:26 +02001152 }
James Chapmanfd558d12010-04-02 06:18:33 +00001153 break;
1154 }
1155#ifdef CONFIG_XFRM
1156 stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
1157#endif
1158 pppol2tp_copy_stats(&stats, &tunnel->stats);
1159 if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) {
1160 err = -EFAULT;
1161 break;
1162 }
Joe Perchesa4ca44f2012-05-16 09:55:56 +00001163 l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1164 tunnel->name);
James Chapmanfd558d12010-04-02 06:18:33 +00001165 err = 0;
1166 break;
1167
1168 default:
1169 err = -ENOSYS;
1170 break;
1171 }
1172
1173 sock_put(sk);
1174
1175 return err;
1176}
1177
1178/* Main ioctl() handler.
1179 * Dispatch to tunnel or session helpers depending on the socket.
1180 */
1181static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
1182 unsigned long arg)
1183{
1184 struct sock *sk = sock->sk;
1185 struct l2tp_session *session;
1186 struct l2tp_tunnel *tunnel;
1187 struct pppol2tp_session *ps;
1188 int err;
1189
1190 if (!sk)
1191 return 0;
1192
1193 err = -EBADF;
1194 if (sock_flag(sk, SOCK_DEAD) != 0)
1195 goto end;
1196
1197 err = -ENOTCONN;
1198 if ((sk->sk_user_data == NULL) ||
1199 (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
1200 goto end;
1201
1202 /* Get session context from the socket */
1203 err = -EBADF;
1204 session = pppol2tp_sock_to_session(sk);
1205 if (session == NULL)
1206 goto end;
1207
1208 /* Special case: if session's session_id is zero, treat ioctl as a
1209 * tunnel ioctl
1210 */
1211 ps = l2tp_session_priv(session);
1212 if ((session->session_id == 0) &&
1213 (session->peer_session_id == 0)) {
1214 err = -EBADF;
1215 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1216 if (tunnel == NULL)
1217 goto end_put_sess;
1218
1219 err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
1220 sock_put(ps->tunnel_sock);
1221 goto end_put_sess;
1222 }
1223
1224 err = pppol2tp_session_ioctl(session, cmd, arg);
1225
1226end_put_sess:
1227 sock_put(sk);
1228end:
1229 return err;
1230}
1231
1232/*****************************************************************************
1233 * setsockopt() / getsockopt() support.
1234 *
1235 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1236 * sockets. In order to control kernel tunnel features, we allow userspace to
1237 * create a special "tunnel" PPPoX socket which is used for control only.
1238 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1239 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1240 *****************************************************************************/
1241
1242/* Tunnel setsockopt() helper.
1243 */
1244static int pppol2tp_tunnel_setsockopt(struct sock *sk,
1245 struct l2tp_tunnel *tunnel,
1246 int optname, int val)
1247{
1248 int err = 0;
1249
1250 switch (optname) {
1251 case PPPOL2TP_SO_DEBUG:
1252 tunnel->debug = val;
Joe Perchesa4ca44f2012-05-16 09:55:56 +00001253 l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: set debug=%x\n",
1254 tunnel->name, tunnel->debug);
James Chapmanfd558d12010-04-02 06:18:33 +00001255 break;
1256
1257 default:
1258 err = -ENOPROTOOPT;
1259 break;
1260 }
1261
1262 return err;
1263}
1264
1265/* Session setsockopt helper.
1266 */
1267static int pppol2tp_session_setsockopt(struct sock *sk,
1268 struct l2tp_session *session,
1269 int optname, int val)
1270{
1271 int err = 0;
1272 struct pppol2tp_session *ps = l2tp_session_priv(session);
1273
1274 switch (optname) {
1275 case PPPOL2TP_SO_RECVSEQ:
1276 if ((val != 0) && (val != 1)) {
1277 err = -EINVAL;
1278 break;
1279 }
1280 session->recv_seq = val ? -1 : 0;
Joe Perchesa4ca44f2012-05-16 09:55:56 +00001281 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1282 "%s: set recv_seq=%d\n",
1283 session->name, session->recv_seq);
James Chapmanfd558d12010-04-02 06:18:33 +00001284 break;
1285
1286 case PPPOL2TP_SO_SENDSEQ:
1287 if ((val != 0) && (val != 1)) {
1288 err = -EINVAL;
1289 break;
1290 }
1291 session->send_seq = val ? -1 : 0;
1292 {
1293 struct sock *ssk = ps->sock;
1294 struct pppox_sock *po = pppox_sk(ssk);
1295 po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
1296 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1297 }
Guillaume Naultbb5016e2014-03-06 11:14:30 +01001298 l2tp_session_set_header_len(session, session->tunnel->version);
Joe Perchesa4ca44f2012-05-16 09:55:56 +00001299 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1300 "%s: set send_seq=%d\n",
1301 session->name, session->send_seq);
James Chapmanfd558d12010-04-02 06:18:33 +00001302 break;
1303
1304 case PPPOL2TP_SO_LNSMODE:
1305 if ((val != 0) && (val != 1)) {
1306 err = -EINVAL;
1307 break;
1308 }
1309 session->lns_mode = val ? -1 : 0;
Joe Perchesa4ca44f2012-05-16 09:55:56 +00001310 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1311 "%s: set lns_mode=%d\n",
1312 session->name, session->lns_mode);
James Chapmanfd558d12010-04-02 06:18:33 +00001313 break;
1314
1315 case PPPOL2TP_SO_DEBUG:
1316 session->debug = val;
Joe Perchesa4ca44f2012-05-16 09:55:56 +00001317 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set debug=%x\n",
1318 session->name, session->debug);
James Chapmanfd558d12010-04-02 06:18:33 +00001319 break;
1320
1321 case PPPOL2TP_SO_REORDERTO:
1322 session->reorder_timeout = msecs_to_jiffies(val);
Joe Perchesa4ca44f2012-05-16 09:55:56 +00001323 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1324 "%s: set reorder_timeout=%d\n",
1325 session->name, session->reorder_timeout);
James Chapmanfd558d12010-04-02 06:18:33 +00001326 break;
1327
1328 default:
1329 err = -ENOPROTOOPT;
1330 break;
1331 }
1332
1333 return err;
1334}
1335
1336/* Main setsockopt() entry point.
1337 * Does API checks, then calls either the tunnel or session setsockopt
1338 * handler, according to whether the PPPoL2TP socket is a for a regular
1339 * session or the special tunnel type.
1340 */
1341static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
1342 char __user *optval, unsigned int optlen)
1343{
1344 struct sock *sk = sock->sk;
1345 struct l2tp_session *session;
1346 struct l2tp_tunnel *tunnel;
1347 struct pppol2tp_session *ps;
1348 int val;
1349 int err;
1350
1351 if (level != SOL_PPPOL2TP)
Sasha Levin3cf521f2014-07-14 17:02:31 -07001352 return -EINVAL;
James Chapmanfd558d12010-04-02 06:18:33 +00001353
1354 if (optlen < sizeof(int))
1355 return -EINVAL;
1356
1357 if (get_user(val, (int __user *)optval))
1358 return -EFAULT;
1359
1360 err = -ENOTCONN;
1361 if (sk->sk_user_data == NULL)
1362 goto end;
1363
1364 /* Get session context from the socket */
1365 err = -EBADF;
1366 session = pppol2tp_sock_to_session(sk);
1367 if (session == NULL)
1368 goto end;
1369
1370 /* Special case: if session_id == 0x0000, treat as operation on tunnel
1371 */
1372 ps = l2tp_session_priv(session);
1373 if ((session->session_id == 0) &&
1374 (session->peer_session_id == 0)) {
1375 err = -EBADF;
1376 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1377 if (tunnel == NULL)
1378 goto end_put_sess;
1379
1380 err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
1381 sock_put(ps->tunnel_sock);
1382 } else
1383 err = pppol2tp_session_setsockopt(sk, session, optname, val);
1384
1385 err = 0;
1386
1387end_put_sess:
1388 sock_put(sk);
1389end:
1390 return err;
1391}
1392
1393/* Tunnel getsockopt helper. Called with sock locked.
1394 */
1395static int pppol2tp_tunnel_getsockopt(struct sock *sk,
1396 struct l2tp_tunnel *tunnel,
1397 int optname, int *val)
1398{
1399 int err = 0;
1400
1401 switch (optname) {
1402 case PPPOL2TP_SO_DEBUG:
1403 *val = tunnel->debug;
Joe Perchesa4ca44f2012-05-16 09:55:56 +00001404 l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: get debug=%x\n",
1405 tunnel->name, tunnel->debug);
James Chapmanfd558d12010-04-02 06:18:33 +00001406 break;
1407
1408 default:
1409 err = -ENOPROTOOPT;
1410 break;
1411 }
1412
1413 return err;
1414}
1415
1416/* Session getsockopt helper. Called with sock locked.
1417 */
1418static int pppol2tp_session_getsockopt(struct sock *sk,
1419 struct l2tp_session *session,
1420 int optname, int *val)
1421{
1422 int err = 0;
1423
1424 switch (optname) {
1425 case PPPOL2TP_SO_RECVSEQ:
1426 *val = session->recv_seq;
Joe Perchesa4ca44f2012-05-16 09:55:56 +00001427 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1428 "%s: get recv_seq=%d\n", session->name, *val);
James Chapmanfd558d12010-04-02 06:18:33 +00001429 break;
1430
1431 case PPPOL2TP_SO_SENDSEQ:
1432 *val = session->send_seq;
Joe Perchesa4ca44f2012-05-16 09:55:56 +00001433 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1434 "%s: get send_seq=%d\n", session->name, *val);
James Chapmanfd558d12010-04-02 06:18:33 +00001435 break;
1436
1437 case PPPOL2TP_SO_LNSMODE:
1438 *val = session->lns_mode;
Joe Perchesa4ca44f2012-05-16 09:55:56 +00001439 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1440 "%s: get lns_mode=%d\n", session->name, *val);
James Chapmanfd558d12010-04-02 06:18:33 +00001441 break;
1442
1443 case PPPOL2TP_SO_DEBUG:
1444 *val = session->debug;
Joe Perchesa4ca44f2012-05-16 09:55:56 +00001445 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get debug=%d\n",
1446 session->name, *val);
James Chapmanfd558d12010-04-02 06:18:33 +00001447 break;
1448
1449 case PPPOL2TP_SO_REORDERTO:
1450 *val = (int) jiffies_to_msecs(session->reorder_timeout);
Joe Perchesa4ca44f2012-05-16 09:55:56 +00001451 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1452 "%s: get reorder_timeout=%d\n", session->name, *val);
James Chapmanfd558d12010-04-02 06:18:33 +00001453 break;
1454
1455 default:
1456 err = -ENOPROTOOPT;
1457 }
1458
1459 return err;
1460}
1461
1462/* Main getsockopt() entry point.
1463 * Does API checks, then calls either the tunnel or session getsockopt
1464 * handler, according to whether the PPPoX socket is a for a regular session
1465 * or the special tunnel type.
1466 */
Joe Perchese3192692012-06-03 17:41:40 +00001467static int pppol2tp_getsockopt(struct socket *sock, int level, int optname,
1468 char __user *optval, int __user *optlen)
James Chapmanfd558d12010-04-02 06:18:33 +00001469{
1470 struct sock *sk = sock->sk;
1471 struct l2tp_session *session;
1472 struct l2tp_tunnel *tunnel;
1473 int val, len;
1474 int err;
1475 struct pppol2tp_session *ps;
1476
1477 if (level != SOL_PPPOL2TP)
Sasha Levin3cf521f2014-07-14 17:02:31 -07001478 return -EINVAL;
James Chapmanfd558d12010-04-02 06:18:33 +00001479
Joe Perchese3192692012-06-03 17:41:40 +00001480 if (get_user(len, optlen))
James Chapmanfd558d12010-04-02 06:18:33 +00001481 return -EFAULT;
1482
1483 len = min_t(unsigned int, len, sizeof(int));
1484
1485 if (len < 0)
1486 return -EINVAL;
1487
1488 err = -ENOTCONN;
1489 if (sk->sk_user_data == NULL)
1490 goto end;
1491
1492 /* Get the session context */
1493 err = -EBADF;
1494 session = pppol2tp_sock_to_session(sk);
1495 if (session == NULL)
1496 goto end;
1497
1498 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1499 ps = l2tp_session_priv(session);
1500 if ((session->session_id == 0) &&
1501 (session->peer_session_id == 0)) {
1502 err = -EBADF;
1503 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1504 if (tunnel == NULL)
1505 goto end_put_sess;
1506
1507 err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
1508 sock_put(ps->tunnel_sock);
1509 } else
1510 err = pppol2tp_session_getsockopt(sk, session, optname, &val);
1511
1512 err = -EFAULT;
Joe Perchese3192692012-06-03 17:41:40 +00001513 if (put_user(len, optlen))
James Chapmanfd558d12010-04-02 06:18:33 +00001514 goto end_put_sess;
1515
1516 if (copy_to_user((void __user *) optval, &val, len))
1517 goto end_put_sess;
1518
1519 err = 0;
1520
1521end_put_sess:
1522 sock_put(sk);
1523end:
1524 return err;
1525}
1526
1527/*****************************************************************************
1528 * /proc filesystem for debug
James Chapmanf7faffa2010-04-02 06:18:49 +00001529 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1530 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
James Chapmanfd558d12010-04-02 06:18:33 +00001531 *****************************************************************************/
1532
1533static unsigned int pppol2tp_net_id;
1534
1535#ifdef CONFIG_PROC_FS
1536
1537struct pppol2tp_seq_data {
1538 struct seq_net_private p;
1539 int tunnel_idx; /* current tunnel */
1540 int session_idx; /* index of session within current tunnel */
1541 struct l2tp_tunnel *tunnel;
1542 struct l2tp_session *session; /* NULL means get next tunnel */
1543};
1544
1545static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
1546{
James Chapmanf7faffa2010-04-02 06:18:49 +00001547 for (;;) {
1548 pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx);
1549 pd->tunnel_idx++;
1550
1551 if (pd->tunnel == NULL)
1552 break;
1553
1554 /* Ignore L2TPv3 tunnels */
1555 if (pd->tunnel->version < 3)
1556 break;
1557 }
James Chapmanfd558d12010-04-02 06:18:33 +00001558}
1559
1560static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
1561{
Guillaume Naultb7902602017-04-03 12:03:13 +02001562 pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx, true);
James Chapmanfd558d12010-04-02 06:18:33 +00001563 pd->session_idx++;
James Chapmanf7faffa2010-04-02 06:18:49 +00001564
James Chapmanfd558d12010-04-02 06:18:33 +00001565 if (pd->session == NULL) {
1566 pd->session_idx = 0;
1567 pppol2tp_next_tunnel(net, pd);
1568 }
1569}
1570
1571static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
1572{
1573 struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
1574 loff_t pos = *offs;
1575 struct net *net;
1576
1577 if (!pos)
1578 goto out;
1579
1580 BUG_ON(m->private == NULL);
1581 pd = m->private;
1582 net = seq_file_net(m);
1583
1584 if (pd->tunnel == NULL)
1585 pppol2tp_next_tunnel(net, pd);
1586 else
1587 pppol2tp_next_session(net, pd);
1588
1589 /* NULL tunnel and session indicates end of list */
1590 if ((pd->tunnel == NULL) && (pd->session == NULL))
1591 pd = NULL;
1592
1593out:
1594 return pd;
1595}
1596
1597static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
1598{
1599 (*pos)++;
1600 return NULL;
1601}
1602
1603static void pppol2tp_seq_stop(struct seq_file *p, void *v)
1604{
1605 /* nothing to do */
1606}
1607
1608static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
1609{
1610 struct l2tp_tunnel *tunnel = v;
1611
1612 seq_printf(m, "\nTUNNEL '%s', %c %d\n",
1613 tunnel->name,
1614 (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
1615 atomic_read(&tunnel->ref_count) - 1);
Tom Parkin7b7c0712013-03-19 06:11:22 +00001616 seq_printf(m, " %08x %ld/%ld/%ld %ld/%ld/%ld\n",
James Chapmanfd558d12010-04-02 06:18:33 +00001617 tunnel->debug,
Tom Parkin7b7c0712013-03-19 06:11:22 +00001618 atomic_long_read(&tunnel->stats.tx_packets),
1619 atomic_long_read(&tunnel->stats.tx_bytes),
1620 atomic_long_read(&tunnel->stats.tx_errors),
1621 atomic_long_read(&tunnel->stats.rx_packets),
1622 atomic_long_read(&tunnel->stats.rx_bytes),
1623 atomic_long_read(&tunnel->stats.rx_errors));
James Chapmanfd558d12010-04-02 06:18:33 +00001624}
1625
1626static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
1627{
1628 struct l2tp_session *session = v;
1629 struct l2tp_tunnel *tunnel = session->tunnel;
1630 struct pppol2tp_session *ps = l2tp_session_priv(session);
James Chapman93454712010-04-02 06:18:44 +00001631 struct pppox_sock *po = pppox_sk(ps->sock);
James Chapmanfd558d12010-04-02 06:18:33 +00001632 u32 ip = 0;
1633 u16 port = 0;
1634
1635 if (tunnel->sock) {
1636 struct inet_sock *inet = inet_sk(tunnel->sock);
1637 ip = ntohl(inet->inet_saddr);
1638 port = ntohs(inet->inet_sport);
1639 }
1640
1641 seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
1642 "%04X/%04X %d %c\n",
1643 session->name, ip, port,
1644 tunnel->tunnel_id,
1645 session->session_id,
1646 tunnel->peer_tunnel_id,
1647 session->peer_session_id,
1648 ps->sock->sk_state,
1649 (session == ps->sock->sk_user_data) ?
1650 'Y' : 'N');
1651 seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n",
1652 session->mtu, session->mru,
1653 session->recv_seq ? 'R' : '-',
1654 session->send_seq ? 'S' : '-',
1655 session->lns_mode ? "LNS" : "LAC",
1656 session->debug,
1657 jiffies_to_msecs(session->reorder_timeout));
Tom Parkin7b7c0712013-03-19 06:11:22 +00001658 seq_printf(m, " %hu/%hu %ld/%ld/%ld %ld/%ld/%ld\n",
James Chapmanfd558d12010-04-02 06:18:33 +00001659 session->nr, session->ns,
Tom Parkin7b7c0712013-03-19 06:11:22 +00001660 atomic_long_read(&session->stats.tx_packets),
1661 atomic_long_read(&session->stats.tx_bytes),
1662 atomic_long_read(&session->stats.tx_errors),
1663 atomic_long_read(&session->stats.rx_packets),
1664 atomic_long_read(&session->stats.rx_bytes),
1665 atomic_long_read(&session->stats.rx_errors));
James Chapman93454712010-04-02 06:18:44 +00001666
1667 if (po)
1668 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
James Chapmanfd558d12010-04-02 06:18:33 +00001669}
1670
1671static int pppol2tp_seq_show(struct seq_file *m, void *v)
1672{
1673 struct pppol2tp_seq_data *pd = v;
1674
1675 /* display header on line 1 */
1676 if (v == SEQ_START_TOKEN) {
1677 seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
1678 seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
1679 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1680 seq_puts(m, " SESSION name, addr/port src-tid/sid "
1681 "dest-tid/sid state user-data-ok\n");
1682 seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1683 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1684 goto out;
1685 }
1686
1687 /* Show the tunnel or session context.
1688 */
Guillaume Naultb7902602017-04-03 12:03:13 +02001689 if (!pd->session) {
James Chapmanfd558d12010-04-02 06:18:33 +00001690 pppol2tp_seq_tunnel_show(m, pd->tunnel);
Guillaume Naultb7902602017-04-03 12:03:13 +02001691 } else {
James Chapmanfd558d12010-04-02 06:18:33 +00001692 pppol2tp_seq_session_show(m, pd->session);
Guillaume Naultb7902602017-04-03 12:03:13 +02001693 if (pd->session->deref)
1694 pd->session->deref(pd->session);
1695 l2tp_session_dec_refcount(pd->session);
1696 }
James Chapmanfd558d12010-04-02 06:18:33 +00001697
1698out:
1699 return 0;
1700}
1701
1702static const struct seq_operations pppol2tp_seq_ops = {
1703 .start = pppol2tp_seq_start,
1704 .next = pppol2tp_seq_next,
1705 .stop = pppol2tp_seq_stop,
1706 .show = pppol2tp_seq_show,
1707};
1708
1709/* Called when our /proc file is opened. We allocate data for use when
1710 * iterating our tunnel / session contexts and store it in the private
1711 * data of the seq_file.
1712 */
1713static int pppol2tp_proc_open(struct inode *inode, struct file *file)
1714{
1715 return seq_open_net(inode, file, &pppol2tp_seq_ops,
1716 sizeof(struct pppol2tp_seq_data));
1717}
1718
1719static const struct file_operations pppol2tp_proc_fops = {
1720 .owner = THIS_MODULE,
1721 .open = pppol2tp_proc_open,
1722 .read = seq_read,
1723 .llseek = seq_lseek,
1724 .release = seq_release_net,
1725};
1726
1727#endif /* CONFIG_PROC_FS */
1728
1729/*****************************************************************************
1730 * Network namespace
1731 *****************************************************************************/
1732
1733static __net_init int pppol2tp_init_net(struct net *net)
1734{
1735 struct proc_dir_entry *pde;
1736 int err = 0;
1737
Gao fengd4beaa62013-02-18 01:34:54 +00001738 pde = proc_create("pppol2tp", S_IRUGO, net->proc_net,
1739 &pppol2tp_proc_fops);
James Chapmanfd558d12010-04-02 06:18:33 +00001740 if (!pde) {
1741 err = -ENOMEM;
1742 goto out;
1743 }
1744
1745out:
1746 return err;
1747}
1748
1749static __net_exit void pppol2tp_exit_net(struct net *net)
1750{
Gao fengece31ff2013-02-18 01:34:56 +00001751 remove_proc_entry("pppol2tp", net->proc_net);
James Chapmanfd558d12010-04-02 06:18:33 +00001752}
1753
1754static struct pernet_operations pppol2tp_net_ops = {
1755 .init = pppol2tp_init_net,
1756 .exit = pppol2tp_exit_net,
1757 .id = &pppol2tp_net_id,
1758};
1759
1760/*****************************************************************************
1761 * Init and cleanup
1762 *****************************************************************************/
1763
1764static const struct proto_ops pppol2tp_ops = {
1765 .family = AF_PPPOX,
1766 .owner = THIS_MODULE,
1767 .release = pppol2tp_release,
1768 .bind = sock_no_bind,
1769 .connect = pppol2tp_connect,
1770 .socketpair = sock_no_socketpair,
1771 .accept = sock_no_accept,
1772 .getname = pppol2tp_getname,
1773 .poll = datagram_poll,
1774 .listen = sock_no_listen,
1775 .shutdown = sock_no_shutdown,
1776 .setsockopt = pppol2tp_setsockopt,
1777 .getsockopt = pppol2tp_getsockopt,
1778 .sendmsg = pppol2tp_sendmsg,
1779 .recvmsg = pppol2tp_recvmsg,
1780 .mmap = sock_no_mmap,
1781 .ioctl = pppox_ioctl,
1782};
1783
Eric Dumazet756e64a2010-09-21 06:43:54 +00001784static const struct pppox_proto pppol2tp_proto = {
James Chapmanfd558d12010-04-02 06:18:33 +00001785 .create = pppol2tp_create,
Wei Yongjune1558a92013-07-02 09:02:07 +08001786 .ioctl = pppol2tp_ioctl,
1787 .owner = THIS_MODULE,
James Chapmanfd558d12010-04-02 06:18:33 +00001788};
1789
James Chapman309795f2010-04-02 06:19:10 +00001790#ifdef CONFIG_L2TP_V3
1791
1792static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = {
1793 .session_create = pppol2tp_session_create,
Tom Parkincf2f5c82013-03-19 06:11:21 +00001794 .session_delete = l2tp_session_delete,
James Chapman309795f2010-04-02 06:19:10 +00001795};
1796
1797#endif /* CONFIG_L2TP_V3 */
1798
James Chapmanfd558d12010-04-02 06:18:33 +00001799static int __init pppol2tp_init(void)
1800{
1801 int err;
1802
1803 err = register_pernet_device(&pppol2tp_net_ops);
1804 if (err)
1805 goto out;
1806
1807 err = proto_register(&pppol2tp_sk_proto, 0);
1808 if (err)
1809 goto out_unregister_pppol2tp_pernet;
1810
1811 err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
1812 if (err)
1813 goto out_unregister_pppol2tp_proto;
1814
James Chapman309795f2010-04-02 06:19:10 +00001815#ifdef CONFIG_L2TP_V3
1816 err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops);
1817 if (err)
1818 goto out_unregister_pppox;
1819#endif
1820
Joe Perchesa4ca44f2012-05-16 09:55:56 +00001821 pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION);
James Chapmanfd558d12010-04-02 06:18:33 +00001822
1823out:
1824 return err;
James Chapman309795f2010-04-02 06:19:10 +00001825
1826#ifdef CONFIG_L2TP_V3
1827out_unregister_pppox:
1828 unregister_pppox_proto(PX_PROTO_OL2TP);
1829#endif
James Chapmanfd558d12010-04-02 06:18:33 +00001830out_unregister_pppol2tp_proto:
1831 proto_unregister(&pppol2tp_sk_proto);
1832out_unregister_pppol2tp_pernet:
1833 unregister_pernet_device(&pppol2tp_net_ops);
1834 goto out;
1835}
1836
1837static void __exit pppol2tp_exit(void)
1838{
James Chapman309795f2010-04-02 06:19:10 +00001839#ifdef CONFIG_L2TP_V3
1840 l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP);
1841#endif
James Chapmanfd558d12010-04-02 06:18:33 +00001842 unregister_pppox_proto(PX_PROTO_OL2TP);
1843 proto_unregister(&pppol2tp_sk_proto);
1844 unregister_pernet_device(&pppol2tp_net_ops);
1845}
1846
1847module_init(pppol2tp_init);
1848module_exit(pppol2tp_exit);
1849
1850MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1851MODULE_DESCRIPTION("PPP over L2TP over UDP");
1852MODULE_LICENSE("GPL");
1853MODULE_VERSION(PPPOL2TP_DRV_VERSION);
Guillaume Nault681b4d82015-12-02 16:27:39 +01001854MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_OL2TP);
Guillaume Nault425cc772017-04-03 13:23:15 +02001855MODULE_ALIAS_L2TP_PWTYPE(7);