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KMS: fix EDID detailed timing vsync parsing
[linux-2.6/cjktty.git] / net / l2tp / l2tp_ppp.c
blob6a53371dba1f1b357f9cd4f34b7af166ed324eab
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
60 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
61
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>
87 #include <linux/ppp-ioctl.h>
88 #include <linux/file.h>
89 #include <linux/hash.h>
90 #include <linux/sort.h>
91 #include <linux/proc_fs.h>
92 #include <linux/l2tp.h>
93 #include <linux/nsproxy.h>
94 #include <net/net_namespace.h>
95 #include <net/netns/generic.h>
96 #include <net/dst.h>
97 #include <net/ip.h>
98 #include <net/udp.h>
99 #include <net/xfrm.h>
100
101 #include <asm/byteorder.h>
102 #include <linux/atomic.h>
103
104 #include "l2tp_core.h"
105
106 #define PPPOL2TP_DRV_VERSION "V2.0"
107
108 /* Space for UDP, L2TP and PPP headers */
109 #define PPPOL2TP_HEADER_OVERHEAD 40
110
111 /* Number of bytes to build transmit L2TP headers.
112 * Unfortunately the size is different depending on whether sequence numbers
113 * are enabled.
114 */
115 #define PPPOL2TP_L2TP_HDR_SIZE_SEQ 10
116 #define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ 6
117
118 /* Private data of each session. This data lives at the end of struct
119 * l2tp_session, referenced via session->priv[].
120 */
121 struct pppol2tp_session {
122 int owner; /* pid that opened the socket */
123
124 struct sock *sock; /* Pointer to the session
125 * PPPoX socket */
126 struct sock *tunnel_sock; /* Pointer to the tunnel UDP
127 * socket */
128 int flags; /* accessed by PPPIOCGFLAGS.
129 * Unused. */
130 };
131
132 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb);
133
134 static const struct ppp_channel_ops pppol2tp_chan_ops = {
135 .start_xmit = pppol2tp_xmit,
136 };
137
138 static const struct proto_ops pppol2tp_ops;
139
140 /* Helpers to obtain tunnel/session contexts from sockets.
141 */
142 static inline struct l2tp_session *pppol2tp_sock_to_session(struct sock *sk)
143 {
144 struct l2tp_session *session;
145
146 if (sk == NULL)
147 return NULL;
148
149 sock_hold(sk);
150 session = (struct l2tp_session *)(sk->sk_user_data);
151 if (session == NULL) {
152 sock_put(sk);
153 goto out;
154 }
155
156 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
157
158 out:
159 return session;
160 }
161
162 /*****************************************************************************
163 * Receive data handling
164 *****************************************************************************/
165
166 static int pppol2tp_recv_payload_hook(struct sk_buff *skb)
167 {
168 /* Skip PPP header, if present. In testing, Microsoft L2TP clients
169 * don't send the PPP header (PPP header compression enabled), but
170 * other clients can include the header. So we cope with both cases
171 * here. The PPP header is always FF03 when using L2TP.
172 *
173 * Note that skb->data[] isn't dereferenced from a u16 ptr here since
174 * the field may be unaligned.
175 */
176 if (!pskb_may_pull(skb, 2))
177 return 1;
178
179 if ((skb->data[0] == 0xff) && (skb->data[1] == 0x03))
180 skb_pull(skb, 2);
181
182 return 0;
183 }
184
185 /* Receive message. This is the recvmsg for the PPPoL2TP socket.
186 */
187 static int pppol2tp_recvmsg(struct kiocb *iocb, struct socket *sock,
188 struct msghdr *msg, size_t len,
189 int flags)
190 {
191 int err;
192 struct sk_buff *skb;
193 struct sock *sk = sock->sk;
194
195 err = -EIO;
196 if (sk->sk_state & PPPOX_BOUND)
197 goto end;
198
199 msg->msg_namelen = 0;
200
201 err = 0;
202 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
203 flags & MSG_DONTWAIT, &err);
204 if (!skb)
205 goto end;
206
207 if (len > skb->len)
208 len = skb->len;
209 else if (len < skb->len)
210 msg->msg_flags |= MSG_TRUNC;
211
212 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len);
213 if (likely(err == 0))
214 err = len;
215
216 kfree_skb(skb);
217 end:
218 return err;
219 }
220
221 static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
222 {
223 struct pppol2tp_session *ps = l2tp_session_priv(session);
224 struct sock *sk = NULL;
225
226 /* If the socket is bound, send it in to PPP's input queue. Otherwise
227 * queue it on the session socket.
228 */
229 sk = ps->sock;
230 if (sk == NULL)
231 goto no_sock;
232
233 if (sk->sk_state & PPPOX_BOUND) {
234 struct pppox_sock *po;
235 l2tp_dbg(session, PPPOL2TP_MSG_DATA,
236 "%s: recv %d byte data frame, passing to ppp\n",
237 session->name, data_len);
238
239 /* We need to forget all info related to the L2TP packet
240 * gathered in the skb as we are going to reuse the same
241 * skb for the inner packet.
242 * Namely we need to:
243 * - reset xfrm (IPSec) information as it applies to
244 * the outer L2TP packet and not to the inner one
245 * - release the dst to force a route lookup on the inner
246 * IP packet since skb->dst currently points to the dst
247 * of the UDP tunnel
248 * - reset netfilter information as it doesn't apply
249 * to the inner packet either
250 */
251 secpath_reset(skb);
252 skb_dst_drop(skb);
253 nf_reset(skb);
254
255 po = pppox_sk(sk);
256 ppp_input(&po->chan, skb);
257 } else {
258 l2tp_info(session, PPPOL2TP_MSG_DATA, "%s: socket not bound\n",
259 session->name);
260
261 /* Not bound. Nothing we can do, so discard. */
262 session->stats.rx_errors++;
263 kfree_skb(skb);
264 }
265
266 return;
267
268 no_sock:
269 l2tp_info(session, PPPOL2TP_MSG_DATA, "%s: no socket\n", session->name);
270 kfree_skb(skb);
271 }
272
273 static void pppol2tp_session_sock_hold(struct l2tp_session *session)
274 {
275 struct pppol2tp_session *ps = l2tp_session_priv(session);
276
277 if (ps->sock)
278 sock_hold(ps->sock);
279 }
280
281 static void pppol2tp_session_sock_put(struct l2tp_session *session)
282 {
283 struct pppol2tp_session *ps = l2tp_session_priv(session);
284
285 if (ps->sock)
286 sock_put(ps->sock);
287 }
288
289 /************************************************************************
290 * Transmit handling
291 ***********************************************************************/
292
293 /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here
294 * when a user application does a sendmsg() on the session socket. L2TP and
295 * PPP headers must be inserted into the user's data.
296 */
297 static int pppol2tp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
298 size_t total_len)
299 {
300 static const unsigned char ppph[2] = { 0xff, 0x03 };
301 struct sock *sk = sock->sk;
302 struct sk_buff *skb;
303 int error;
304 struct l2tp_session *session;
305 struct l2tp_tunnel *tunnel;
306 struct pppol2tp_session *ps;
307 int uhlen;
308
309 error = -ENOTCONN;
310 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
311 goto error;
312
313 /* Get session and tunnel contexts */
314 error = -EBADF;
315 session = pppol2tp_sock_to_session(sk);
316 if (session == NULL)
317 goto error;
318
319 ps = l2tp_session_priv(session);
320 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
321 if (tunnel == NULL)
322 goto error_put_sess;
323
324 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
325
326 /* Allocate a socket buffer */
327 error = -ENOMEM;
328 skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) +
329 uhlen + session->hdr_len +
330 sizeof(ppph) + total_len,
331 0, GFP_KERNEL);
332 if (!skb)
333 goto error_put_sess_tun;
334
335 /* Reserve space for headers. */
336 skb_reserve(skb, NET_SKB_PAD);
337 skb_reset_network_header(skb);
338 skb_reserve(skb, sizeof(struct iphdr));
339 skb_reset_transport_header(skb);
340 skb_reserve(skb, uhlen);
341
342 /* Add PPP header */
343 skb->data[0] = ppph[0];
344 skb->data[1] = ppph[1];
345 skb_put(skb, 2);
346
347 /* Copy user data into skb */
348 error = memcpy_fromiovec(skb->data, m->msg_iov, total_len);
349 if (error < 0) {
350 kfree_skb(skb);
351 goto error_put_sess_tun;
352 }
353 skb_put(skb, total_len);
354
355 l2tp_xmit_skb(session, skb, session->hdr_len);
356
357 sock_put(ps->tunnel_sock);
358 sock_put(sk);
359
360 return error;
361
362 error_put_sess_tun:
363 sock_put(ps->tunnel_sock);
364 error_put_sess:
365 sock_put(sk);
366 error:
367 return error;
368 }
369
370 /* Transmit function called by generic PPP driver. Sends PPP frame
371 * over PPPoL2TP socket.
372 *
373 * This is almost the same as pppol2tp_sendmsg(), but rather than
374 * being called with a msghdr from userspace, it is called with a skb
375 * from the kernel.
376 *
377 * The supplied skb from ppp doesn't have enough headroom for the
378 * insertion of L2TP, UDP and IP headers so we need to allocate more
379 * headroom in the skb. This will create a cloned skb. But we must be
380 * careful in the error case because the caller will expect to free
381 * the skb it supplied, not our cloned skb. So we take care to always
382 * leave the original skb unfreed if we return an error.
383 */
384 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
385 {
386 static const u8 ppph[2] = { 0xff, 0x03 };
387 struct sock *sk = (struct sock *) chan->private;
388 struct sock *sk_tun;
389 struct l2tp_session *session;
390 struct l2tp_tunnel *tunnel;
391 struct pppol2tp_session *ps;
392 int uhlen, headroom;
393
394 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
395 goto abort;
396
397 /* Get session and tunnel contexts from the socket */
398 session = pppol2tp_sock_to_session(sk);
399 if (session == NULL)
400 goto abort;
401
402 ps = l2tp_session_priv(session);
403 sk_tun = ps->tunnel_sock;
404 if (sk_tun == NULL)
405 goto abort_put_sess;
406 tunnel = l2tp_sock_to_tunnel(sk_tun);
407 if (tunnel == NULL)
408 goto abort_put_sess;
409
410 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
411 headroom = NET_SKB_PAD +
412 sizeof(struct iphdr) + /* IP header */
413 uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */
414 session->hdr_len + /* L2TP header */
415 sizeof(ppph); /* PPP header */
416 if (skb_cow_head(skb, headroom))
417 goto abort_put_sess_tun;
418
419 /* Setup PPP header */
420 __skb_push(skb, sizeof(ppph));
421 skb->data[0] = ppph[0];
422 skb->data[1] = ppph[1];
423
424 l2tp_xmit_skb(session, skb, session->hdr_len);
425
426 sock_put(sk_tun);
427 sock_put(sk);
428 return 1;
429
430 abort_put_sess_tun:
431 sock_put(sk_tun);
432 abort_put_sess:
433 sock_put(sk);
434 abort:
435 /* Free the original skb */
436 kfree_skb(skb);
437 return 1;
438 }
439
440 /*****************************************************************************
441 * Session (and tunnel control) socket create/destroy.
442 *****************************************************************************/
443
444 /* Called by l2tp_core when a session socket is being closed.
445 */
446 static void pppol2tp_session_close(struct l2tp_session *session)
447 {
448 struct pppol2tp_session *ps = l2tp_session_priv(session);
449 struct sock *sk = ps->sock;
450 struct sk_buff *skb;
451
452 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
453
454 if (session->session_id == 0)
455 goto out;
456
457 if (sk != NULL) {
458 lock_sock(sk);
459
460 if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) {
461 pppox_unbind_sock(sk);
462 sk->sk_state = PPPOX_DEAD;
463 sk->sk_state_change(sk);
464 }
465
466 /* Purge any queued data */
467 skb_queue_purge(&sk->sk_receive_queue);
468 skb_queue_purge(&sk->sk_write_queue);
469 while ((skb = skb_dequeue(&session->reorder_q))) {
470 kfree_skb(skb);
471 sock_put(sk);
472 }
473
474 release_sock(sk);
475 }
476
477 out:
478 return;
479 }
480
481 /* Really kill the session socket. (Called from sock_put() if
482 * refcnt == 0.)
483 */
484 static void pppol2tp_session_destruct(struct sock *sk)
485 {
486 struct l2tp_session *session;
487
488 if (sk->sk_user_data != NULL) {
489 session = sk->sk_user_data;
490 if (session == NULL)
491 goto out;
492
493 sk->sk_user_data = NULL;
494 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
495 l2tp_session_dec_refcount(session);
496 }
497
498 out:
499 return;
500 }
501
502 /* Called when the PPPoX socket (session) is closed.
503 */
504 static int pppol2tp_release(struct socket *sock)
505 {
506 struct sock *sk = sock->sk;
507 struct l2tp_session *session;
508 int error;
509
510 if (!sk)
511 return 0;
512
513 error = -EBADF;
514 lock_sock(sk);
515 if (sock_flag(sk, SOCK_DEAD) != 0)
516 goto error;
517
518 pppox_unbind_sock(sk);
519
520 /* Signal the death of the socket. */
521 sk->sk_state = PPPOX_DEAD;
522 sock_orphan(sk);
523 sock->sk = NULL;
524
525 session = pppol2tp_sock_to_session(sk);
526
527 /* Purge any queued data */
528 skb_queue_purge(&sk->sk_receive_queue);
529 skb_queue_purge(&sk->sk_write_queue);
530 if (session != NULL) {
531 struct sk_buff *skb;
532 while ((skb = skb_dequeue(&session->reorder_q))) {
533 kfree_skb(skb);
534 sock_put(sk);
535 }
536 sock_put(sk);
537 }
538
539 release_sock(sk);
540
541 /* This will delete the session context via
542 * pppol2tp_session_destruct() if the socket's refcnt drops to
543 * zero.
544 */
545 sock_put(sk);
546
547 return 0;
548
549 error:
550 release_sock(sk);
551 return error;
552 }
553
554 static struct proto pppol2tp_sk_proto = {
555 .name = "PPPOL2TP",
556 .owner = THIS_MODULE,
557 .obj_size = sizeof(struct pppox_sock),
558 };
559
560 static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb)
561 {
562 int rc;
563
564 rc = l2tp_udp_encap_recv(sk, skb);
565 if (rc)
566 kfree_skb(skb);
567
568 return NET_RX_SUCCESS;
569 }
570
571 /* socket() handler. Initialize a new struct sock.
572 */
573 static int pppol2tp_create(struct net *net, struct socket *sock)
574 {
575 int error = -ENOMEM;
576 struct sock *sk;
577
578 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto);
579 if (!sk)
580 goto out;
581
582 sock_init_data(sock, sk);
583
584 sock->state = SS_UNCONNECTED;
585 sock->ops = &pppol2tp_ops;
586
587 sk->sk_backlog_rcv = pppol2tp_backlog_recv;
588 sk->sk_protocol = PX_PROTO_OL2TP;
589 sk->sk_family = PF_PPPOX;
590 sk->sk_state = PPPOX_NONE;
591 sk->sk_type = SOCK_STREAM;
592 sk->sk_destruct = pppol2tp_session_destruct;
593
594 error = 0;
595
596 out:
597 return error;
598 }
599
600 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
601 static void pppol2tp_show(struct seq_file *m, void *arg)
602 {
603 struct l2tp_session *session = arg;
604 struct pppol2tp_session *ps = l2tp_session_priv(session);
605
606 if (ps) {
607 struct pppox_sock *po = pppox_sk(ps->sock);
608 if (po)
609 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
610 }
611 }
612 #endif
613
614 /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
615 */
616 static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
617 int sockaddr_len, int flags)
618 {
619 struct sock *sk = sock->sk;
620 struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr;
621 struct pppox_sock *po = pppox_sk(sk);
622 struct l2tp_session *session = NULL;
623 struct l2tp_tunnel *tunnel;
624 struct pppol2tp_session *ps;
625 struct dst_entry *dst;
626 struct l2tp_session_cfg cfg = { 0, };
627 int error = 0;
628 u32 tunnel_id, peer_tunnel_id;
629 u32 session_id, peer_session_id;
630 int ver = 2;
631 int fd;
632
633 lock_sock(sk);
634
635 error = -EINVAL;
636 if (sp->sa_protocol != PX_PROTO_OL2TP)
637 goto end;
638
639 /* Check for already bound sockets */
640 error = -EBUSY;
641 if (sk->sk_state & PPPOX_CONNECTED)
642 goto end;
643
644 /* We don't supporting rebinding anyway */
645 error = -EALREADY;
646 if (sk->sk_user_data)
647 goto end; /* socket is already attached */
648
649 /* Get params from socket address. Handle L2TPv2 and L2TPv3.
650 * This is nasty because there are different sockaddr_pppol2tp
651 * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use
652 * the sockaddr size to determine which structure the caller
653 * is using.
654 */
655 peer_tunnel_id = 0;
656 if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) {
657 fd = sp->pppol2tp.fd;
658 tunnel_id = sp->pppol2tp.s_tunnel;
659 peer_tunnel_id = sp->pppol2tp.d_tunnel;
660 session_id = sp->pppol2tp.s_session;
661 peer_session_id = sp->pppol2tp.d_session;
662 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) {
663 struct sockaddr_pppol2tpv3 *sp3 =
664 (struct sockaddr_pppol2tpv3 *) sp;
665 ver = 3;
666 fd = sp3->pppol2tp.fd;
667 tunnel_id = sp3->pppol2tp.s_tunnel;
668 peer_tunnel_id = sp3->pppol2tp.d_tunnel;
669 session_id = sp3->pppol2tp.s_session;
670 peer_session_id = sp3->pppol2tp.d_session;
671 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpin6)) {
672 struct sockaddr_pppol2tpin6 *sp6 =
673 (struct sockaddr_pppol2tpin6 *) sp;
674 fd = sp6->pppol2tp.fd;
675 tunnel_id = sp6->pppol2tp.s_tunnel;
676 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
677 session_id = sp6->pppol2tp.s_session;
678 peer_session_id = sp6->pppol2tp.d_session;
679 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3in6)) {
680 struct sockaddr_pppol2tpv3in6 *sp6 =
681 (struct sockaddr_pppol2tpv3in6 *) sp;
682 ver = 3;
683 fd = sp6->pppol2tp.fd;
684 tunnel_id = sp6->pppol2tp.s_tunnel;
685 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
686 session_id = sp6->pppol2tp.s_session;
687 peer_session_id = sp6->pppol2tp.d_session;
688 } else {
689 error = -EINVAL;
690 goto end; /* bad socket address */
691 }
692
693 /* Don't bind if tunnel_id is 0 */
694 error = -EINVAL;
695 if (tunnel_id == 0)
696 goto end;
697
698 tunnel = l2tp_tunnel_find(sock_net(sk), tunnel_id);
699
700 /* Special case: create tunnel context if session_id and
701 * peer_session_id is 0. Otherwise look up tunnel using supplied
702 * tunnel id.
703 */
704 if ((session_id == 0) && (peer_session_id == 0)) {
705 if (tunnel == NULL) {
706 struct l2tp_tunnel_cfg tcfg = {
707 .encap = L2TP_ENCAPTYPE_UDP,
708 .debug = 0,
709 };
710 error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel);
711 if (error < 0)
712 goto end;
713 }
714 } else {
715 /* Error if we can't find the tunnel */
716 error = -ENOENT;
717 if (tunnel == NULL)
718 goto end;
719
720 /* Error if socket is not prepped */
721 if (tunnel->sock == NULL)
722 goto end;
723 }
724
725 if (tunnel->recv_payload_hook == NULL)
726 tunnel->recv_payload_hook = pppol2tp_recv_payload_hook;
727
728 if (tunnel->peer_tunnel_id == 0)
729 tunnel->peer_tunnel_id = peer_tunnel_id;
730
731 /* Create session if it doesn't already exist. We handle the
732 * case where a session was previously created by the netlink
733 * interface by checking that the session doesn't already have
734 * a socket and its tunnel socket are what we expect. If any
735 * of those checks fail, return EEXIST to the caller.
736 */
737 session = l2tp_session_find(sock_net(sk), tunnel, session_id);
738 if (session == NULL) {
739 /* Default MTU must allow space for UDP/L2TP/PPP
740 * headers.
741 */
742 cfg.mtu = cfg.mru = 1500 - PPPOL2TP_HEADER_OVERHEAD;
743
744 /* Allocate and initialize a new session context. */
745 session = l2tp_session_create(sizeof(struct pppol2tp_session),
746 tunnel, session_id,
747 peer_session_id, &cfg);
748 if (session == NULL) {
749 error = -ENOMEM;
750 goto end;
751 }
752 } else {
753 ps = l2tp_session_priv(session);
754 error = -EEXIST;
755 if (ps->sock != NULL)
756 goto end;
757
758 /* consistency checks */
759 if (ps->tunnel_sock != tunnel->sock)
760 goto end;
761 }
762
763 /* Associate session with its PPPoL2TP socket */
764 ps = l2tp_session_priv(session);
765 ps->owner = current->pid;
766 ps->sock = sk;
767 ps->tunnel_sock = tunnel->sock;
768
769 session->recv_skb = pppol2tp_recv;
770 session->session_close = pppol2tp_session_close;
771 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
772 session->show = pppol2tp_show;
773 #endif
774
775 /* We need to know each time a skb is dropped from the reorder
776 * queue.
777 */
778 session->ref = pppol2tp_session_sock_hold;
779 session->deref = pppol2tp_session_sock_put;
780
781 /* If PMTU discovery was enabled, use the MTU that was discovered */
782 dst = sk_dst_get(sk);
783 if (dst != NULL) {
784 u32 pmtu = dst_mtu(__sk_dst_get(sk));
785 if (pmtu != 0)
786 session->mtu = session->mru = pmtu -
787 PPPOL2TP_HEADER_OVERHEAD;
788 dst_release(dst);
789 }
790
791 /* Special case: if source & dest session_id == 0x0000, this
792 * socket is being created to manage the tunnel. Just set up
793 * the internal context for use by ioctl() and sockopt()
794 * handlers.
795 */
796 if ((session->session_id == 0) &&
797 (session->peer_session_id == 0)) {
798 error = 0;
799 goto out_no_ppp;
800 }
801
802 /* The only header we need to worry about is the L2TP
803 * header. This size is different depending on whether
804 * sequence numbers are enabled for the data channel.
805 */
806 po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
807
808 po->chan.private = sk;
809 po->chan.ops = &pppol2tp_chan_ops;
810 po->chan.mtu = session->mtu;
811
812 error = ppp_register_net_channel(sock_net(sk), &po->chan);
813 if (error)
814 goto end;
815
816 out_no_ppp:
817 /* This is how we get the session context from the socket. */
818 sk->sk_user_data = session;
819 sk->sk_state = PPPOX_CONNECTED;
820 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: created\n",
821 session->name);
822
823 end:
824 release_sock(sk);
825
826 return error;
827 }
828
829 #ifdef CONFIG_L2TP_V3
830
831 /* Called when creating sessions via the netlink interface.
832 */
833 static int pppol2tp_session_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg)
834 {
835 int error;
836 struct l2tp_tunnel *tunnel;
837 struct l2tp_session *session;
838 struct pppol2tp_session *ps;
839
840 tunnel = l2tp_tunnel_find(net, tunnel_id);
841
842 /* Error if we can't find the tunnel */
843 error = -ENOENT;
844 if (tunnel == NULL)
845 goto out;
846
847 /* Error if tunnel socket is not prepped */
848 if (tunnel->sock == NULL)
849 goto out;
850
851 /* Check that this session doesn't already exist */
852 error = -EEXIST;
853 session = l2tp_session_find(net, tunnel, session_id);
854 if (session != NULL)
855 goto out;
856
857 /* Default MTU values. */
858 if (cfg->mtu == 0)
859 cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
860 if (cfg->mru == 0)
861 cfg->mru = cfg->mtu;
862
863 /* Allocate and initialize a new session context. */
864 error = -ENOMEM;
865 session = l2tp_session_create(sizeof(struct pppol2tp_session),
866 tunnel, session_id,
867 peer_session_id, cfg);
868 if (session == NULL)
869 goto out;
870
871 ps = l2tp_session_priv(session);
872 ps->tunnel_sock = tunnel->sock;
873
874 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: created\n",
875 session->name);
876
877 error = 0;
878
879 out:
880 return error;
881 }
882
883 /* Called when deleting sessions via the netlink interface.
884 */
885 static int pppol2tp_session_delete(struct l2tp_session *session)
886 {
887 struct pppol2tp_session *ps = l2tp_session_priv(session);
888
889 if (ps->sock == NULL)
890 l2tp_session_dec_refcount(session);
891
892 return 0;
893 }
894
895 #endif /* CONFIG_L2TP_V3 */
896
897 /* getname() support.
898 */
899 static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
900 int *usockaddr_len, int peer)
901 {
902 int len = 0;
903 int error = 0;
904 struct l2tp_session *session;
905 struct l2tp_tunnel *tunnel;
906 struct sock *sk = sock->sk;
907 struct inet_sock *inet;
908 struct pppol2tp_session *pls;
909
910 error = -ENOTCONN;
911 if (sk == NULL)
912 goto end;
913 if (sk->sk_state != PPPOX_CONNECTED)
914 goto end;
915
916 error = -EBADF;
917 session = pppol2tp_sock_to_session(sk);
918 if (session == NULL)
919 goto end;
920
921 pls = l2tp_session_priv(session);
922 tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock);
923 if (tunnel == NULL) {
924 error = -EBADF;
925 goto end_put_sess;
926 }
927
928 inet = inet_sk(tunnel->sock);
929 if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) {
930 struct sockaddr_pppol2tp sp;
931 len = sizeof(sp);
932 memset(&sp, 0, len);
933 sp.sa_family = AF_PPPOX;
934 sp.sa_protocol = PX_PROTO_OL2TP;
935 sp.pppol2tp.fd = tunnel->fd;
936 sp.pppol2tp.pid = pls->owner;
937 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
938 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
939 sp.pppol2tp.s_session = session->session_id;
940 sp.pppol2tp.d_session = session->peer_session_id;
941 sp.pppol2tp.addr.sin_family = AF_INET;
942 sp.pppol2tp.addr.sin_port = inet->inet_dport;
943 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
944 memcpy(uaddr, &sp, len);
945 #if IS_ENABLED(CONFIG_IPV6)
946 } else if ((tunnel->version == 2) &&
947 (tunnel->sock->sk_family == AF_INET6)) {
948 struct ipv6_pinfo *np = inet6_sk(tunnel->sock);
949 struct sockaddr_pppol2tpin6 sp;
950 len = sizeof(sp);
951 memset(&sp, 0, len);
952 sp.sa_family = AF_PPPOX;
953 sp.sa_protocol = PX_PROTO_OL2TP;
954 sp.pppol2tp.fd = tunnel->fd;
955 sp.pppol2tp.pid = pls->owner;
956 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
957 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
958 sp.pppol2tp.s_session = session->session_id;
959 sp.pppol2tp.d_session = session->peer_session_id;
960 sp.pppol2tp.addr.sin6_family = AF_INET6;
961 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
962 memcpy(&sp.pppol2tp.addr.sin6_addr, &np->daddr,
963 sizeof(np->daddr));
964 memcpy(uaddr, &sp, len);
965 } else if ((tunnel->version == 3) &&
966 (tunnel->sock->sk_family == AF_INET6)) {
967 struct ipv6_pinfo *np = inet6_sk(tunnel->sock);
968 struct sockaddr_pppol2tpv3in6 sp;
969 len = sizeof(sp);
970 memset(&sp, 0, len);
971 sp.sa_family = AF_PPPOX;
972 sp.sa_protocol = PX_PROTO_OL2TP;
973 sp.pppol2tp.fd = tunnel->fd;
974 sp.pppol2tp.pid = pls->owner;
975 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
976 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
977 sp.pppol2tp.s_session = session->session_id;
978 sp.pppol2tp.d_session = session->peer_session_id;
979 sp.pppol2tp.addr.sin6_family = AF_INET6;
980 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
981 memcpy(&sp.pppol2tp.addr.sin6_addr, &np->daddr,
982 sizeof(np->daddr));
983 memcpy(uaddr, &sp, len);
984 #endif
985 } else if (tunnel->version == 3) {
986 struct sockaddr_pppol2tpv3 sp;
987 len = sizeof(sp);
988 memset(&sp, 0, len);
989 sp.sa_family = AF_PPPOX;
990 sp.sa_protocol = PX_PROTO_OL2TP;
991 sp.pppol2tp.fd = tunnel->fd;
992 sp.pppol2tp.pid = pls->owner;
993 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
994 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
995 sp.pppol2tp.s_session = session->session_id;
996 sp.pppol2tp.d_session = session->peer_session_id;
997 sp.pppol2tp.addr.sin_family = AF_INET;
998 sp.pppol2tp.addr.sin_port = inet->inet_dport;
999 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
1000 memcpy(uaddr, &sp, len);
1001 }
1002
1003 *usockaddr_len = len;
1004
1005 sock_put(pls->tunnel_sock);
1006 end_put_sess:
1007 sock_put(sk);
1008 error = 0;
1009
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,
1026 struct l2tp_stats *stats)
1027 {
1028 dest->tx_packets = stats->tx_packets;
1029 dest->tx_bytes = stats->tx_bytes;
1030 dest->tx_errors = stats->tx_errors;
1031 dest->rx_packets = stats->rx_packets;
1032 dest->rx_bytes = stats->rx_bytes;
1033 dest->rx_seq_discards = stats->rx_seq_discards;
1034 dest->rx_oos_packets = stats->rx_oos_packets;
1035 dest->rx_errors = stats->rx_errors;
1036 }
1037
1038 /* Session ioctl helper.
1039 */
1040 static int pppol2tp_session_ioctl(struct l2tp_session *session,
1041 unsigned int cmd, unsigned long arg)
1042 {
1043 struct ifreq ifr;
1044 int err = 0;
1045 struct sock *sk;
1046 int val = (int) arg;
1047 struct pppol2tp_session *ps = l2tp_session_priv(session);
1048 struct l2tp_tunnel *tunnel = session->tunnel;
1049 struct pppol2tp_ioc_stats stats;
1050
1051 l2tp_dbg(session, PPPOL2TP_MSG_CONTROL,
1052 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
1053 session->name, cmd, arg);
1054
1055 sk = ps->sock;
1056 sock_hold(sk);
1057
1058 switch (cmd) {
1059 case SIOCGIFMTU:
1060 err = -ENXIO;
1061 if (!(sk->sk_state & PPPOX_CONNECTED))
1062 break;
1063
1064 err = -EFAULT;
1065 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1066 break;
1067 ifr.ifr_mtu = session->mtu;
1068 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
1069 break;
1070
1071 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get mtu=%d\n",
1072 session->name, session->mtu);
1073 err = 0;
1074 break;
1075
1076 case SIOCSIFMTU:
1077 err = -ENXIO;
1078 if (!(sk->sk_state & PPPOX_CONNECTED))
1079 break;
1080
1081 err = -EFAULT;
1082 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1083 break;
1084
1085 session->mtu = ifr.ifr_mtu;
1086
1087 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set mtu=%d\n",
1088 session->name, session->mtu);
1089 err = 0;
1090 break;
1091
1092 case PPPIOCGMRU:
1093 err = -ENXIO;
1094 if (!(sk->sk_state & PPPOX_CONNECTED))
1095 break;
1096
1097 err = -EFAULT;
1098 if (put_user(session->mru, (int __user *) arg))
1099 break;
1100
1101 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get mru=%d\n",
1102 session->name, session->mru);
1103 err = 0;
1104 break;
1105
1106 case PPPIOCSMRU:
1107 err = -ENXIO;
1108 if (!(sk->sk_state & PPPOX_CONNECTED))
1109 break;
1110
1111 err = -EFAULT;
1112 if (get_user(val, (int __user *) arg))
1113 break;
1114
1115 session->mru = val;
1116 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set mru=%d\n",
1117 session->name, session->mru);
1118 err = 0;
1119 break;
1120
1121 case PPPIOCGFLAGS:
1122 err = -EFAULT;
1123 if (put_user(ps->flags, (int __user *) arg))
1124 break;
1125
1126 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get flags=%d\n",
1127 session->name, ps->flags);
1128 err = 0;
1129 break;
1130
1131 case PPPIOCSFLAGS:
1132 err = -EFAULT;
1133 if (get_user(val, (int __user *) arg))
1134 break;
1135 ps->flags = val;
1136 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set flags=%d\n",
1137 session->name, ps->flags);
1138 err = 0;
1139 break;
1140
1141 case PPPIOCGL2TPSTATS:
1142 err = -ENXIO;
1143 if (!(sk->sk_state & PPPOX_CONNECTED))
1144 break;
1145
1146 memset(&stats, 0, sizeof(stats));
1147 stats.tunnel_id = tunnel->tunnel_id;
1148 stats.session_id = session->session_id;
1149 pppol2tp_copy_stats(&stats, &session->stats);
1150 if (copy_to_user((void __user *) arg, &stats,
1151 sizeof(stats)))
1152 break;
1153 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1154 session->name);
1155 err = 0;
1156 break;
1157
1158 default:
1159 err = -ENOSYS;
1160 break;
1161 }
1162
1163 sock_put(sk);
1164
1165 return err;
1166 }
1167
1168 /* Tunnel ioctl helper.
1169 *
1170 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1171 * specifies a session_id, the session ioctl handler is called. This allows an
1172 * application to retrieve session stats via a tunnel socket.
1173 */
1174 static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
1175 unsigned int cmd, unsigned long arg)
1176 {
1177 int err = 0;
1178 struct sock *sk;
1179 struct pppol2tp_ioc_stats stats;
1180
1181 l2tp_dbg(tunnel, PPPOL2TP_MSG_CONTROL,
1182 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1183 tunnel->name, cmd, arg);
1184
1185 sk = tunnel->sock;
1186 sock_hold(sk);
1187
1188 switch (cmd) {
1189 case PPPIOCGL2TPSTATS:
1190 err = -ENXIO;
1191 if (!(sk->sk_state & PPPOX_CONNECTED))
1192 break;
1193
1194 if (copy_from_user(&stats, (void __user *) arg,
1195 sizeof(stats))) {
1196 err = -EFAULT;
1197 break;
1198 }
1199 if (stats.session_id != 0) {
1200 /* resend to session ioctl handler */
1201 struct l2tp_session *session =
1202 l2tp_session_find(sock_net(sk), tunnel, stats.session_id);
1203 if (session != NULL)
1204 err = pppol2tp_session_ioctl(session, cmd, arg);
1205 else
1206 err = -EBADR;
1207 break;
1208 }
1209 #ifdef CONFIG_XFRM
1210 stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
1211 #endif
1212 pppol2tp_copy_stats(&stats, &tunnel->stats);
1213 if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) {
1214 err = -EFAULT;
1215 break;
1216 }
1217 l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1218 tunnel->name);
1219 err = 0;
1220 break;
1221
1222 default:
1223 err = -ENOSYS;
1224 break;
1225 }
1226
1227 sock_put(sk);
1228
1229 return err;
1230 }
1231
1232 /* Main ioctl() handler.
1233 * Dispatch to tunnel or session helpers depending on the socket.
1234 */
1235 static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
1236 unsigned long arg)
1237 {
1238 struct sock *sk = sock->sk;
1239 struct l2tp_session *session;
1240 struct l2tp_tunnel *tunnel;
1241 struct pppol2tp_session *ps;
1242 int err;
1243
1244 if (!sk)
1245 return 0;
1246
1247 err = -EBADF;
1248 if (sock_flag(sk, SOCK_DEAD) != 0)
1249 goto end;
1250
1251 err = -ENOTCONN;
1252 if ((sk->sk_user_data == NULL) ||
1253 (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
1254 goto end;
1255
1256 /* Get session context from the socket */
1257 err = -EBADF;
1258 session = pppol2tp_sock_to_session(sk);
1259 if (session == NULL)
1260 goto end;
1261
1262 /* Special case: if session's session_id is zero, treat ioctl as a
1263 * tunnel ioctl
1264 */
1265 ps = l2tp_session_priv(session);
1266 if ((session->session_id == 0) &&
1267 (session->peer_session_id == 0)) {
1268 err = -EBADF;
1269 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1270 if (tunnel == NULL)
1271 goto end_put_sess;
1272
1273 err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
1274 sock_put(ps->tunnel_sock);
1275 goto end_put_sess;
1276 }
1277
1278 err = pppol2tp_session_ioctl(session, cmd, arg);
1279
1280 end_put_sess:
1281 sock_put(sk);
1282 end:
1283 return err;
1284 }
1285
1286 /*****************************************************************************
1287 * setsockopt() / getsockopt() support.
1288 *
1289 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1290 * sockets. In order to control kernel tunnel features, we allow userspace to
1291 * create a special "tunnel" PPPoX socket which is used for control only.
1292 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1293 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1294 *****************************************************************************/
1295
1296 /* Tunnel setsockopt() helper.
1297 */
1298 static int pppol2tp_tunnel_setsockopt(struct sock *sk,
1299 struct l2tp_tunnel *tunnel,
1300 int optname, int val)
1301 {
1302 int err = 0;
1303
1304 switch (optname) {
1305 case PPPOL2TP_SO_DEBUG:
1306 tunnel->debug = val;
1307 l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: set debug=%x\n",
1308 tunnel->name, tunnel->debug);
1309 break;
1310
1311 default:
1312 err = -ENOPROTOOPT;
1313 break;
1314 }
1315
1316 return err;
1317 }
1318
1319 /* Session setsockopt helper.
1320 */
1321 static int pppol2tp_session_setsockopt(struct sock *sk,
1322 struct l2tp_session *session,
1323 int optname, int val)
1324 {
1325 int err = 0;
1326 struct pppol2tp_session *ps = l2tp_session_priv(session);
1327
1328 switch (optname) {
1329 case PPPOL2TP_SO_RECVSEQ:
1330 if ((val != 0) && (val != 1)) {
1331 err = -EINVAL;
1332 break;
1333 }
1334 session->recv_seq = val ? -1 : 0;
1335 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1336 "%s: set recv_seq=%d\n",
1337 session->name, session->recv_seq);
1338 break;
1339
1340 case PPPOL2TP_SO_SENDSEQ:
1341 if ((val != 0) && (val != 1)) {
1342 err = -EINVAL;
1343 break;
1344 }
1345 session->send_seq = val ? -1 : 0;
1346 {
1347 struct sock *ssk = ps->sock;
1348 struct pppox_sock *po = pppox_sk(ssk);
1349 po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
1350 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1351 }
1352 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1353 "%s: set send_seq=%d\n",
1354 session->name, session->send_seq);
1355 break;
1356
1357 case PPPOL2TP_SO_LNSMODE:
1358 if ((val != 0) && (val != 1)) {
1359 err = -EINVAL;
1360 break;
1361 }
1362 session->lns_mode = val ? -1 : 0;
1363 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1364 "%s: set lns_mode=%d\n",
1365 session->name, session->lns_mode);
1366 break;
1367
1368 case PPPOL2TP_SO_DEBUG:
1369 session->debug = val;
1370 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set debug=%x\n",
1371 session->name, session->debug);
1372 break;
1373
1374 case PPPOL2TP_SO_REORDERTO:
1375 session->reorder_timeout = msecs_to_jiffies(val);
1376 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1377 "%s: set reorder_timeout=%d\n",
1378 session->name, session->reorder_timeout);
1379 break;
1380
1381 default:
1382 err = -ENOPROTOOPT;
1383 break;
1384 }
1385
1386 return err;
1387 }
1388
1389 /* Main setsockopt() entry point.
1390 * Does API checks, then calls either the tunnel or session setsockopt
1391 * handler, according to whether the PPPoL2TP socket is a for a regular
1392 * session or the special tunnel type.
1393 */
1394 static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
1395 char __user *optval, unsigned int optlen)
1396 {
1397 struct sock *sk = sock->sk;
1398 struct l2tp_session *session;
1399 struct l2tp_tunnel *tunnel;
1400 struct pppol2tp_session *ps;
1401 int val;
1402 int err;
1403
1404 if (level != SOL_PPPOL2TP)
1405 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
1406
1407 if (optlen < sizeof(int))
1408 return -EINVAL;
1409
1410 if (get_user(val, (int __user *)optval))
1411 return -EFAULT;
1412
1413 err = -ENOTCONN;
1414 if (sk->sk_user_data == NULL)
1415 goto end;
1416
1417 /* Get session context from the socket */
1418 err = -EBADF;
1419 session = pppol2tp_sock_to_session(sk);
1420 if (session == NULL)
1421 goto end;
1422
1423 /* Special case: if session_id == 0x0000, treat as operation on tunnel
1424 */
1425 ps = l2tp_session_priv(session);
1426 if ((session->session_id == 0) &&
1427 (session->peer_session_id == 0)) {
1428 err = -EBADF;
1429 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1430 if (tunnel == NULL)
1431 goto end_put_sess;
1432
1433 err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
1434 sock_put(ps->tunnel_sock);
1435 } else
1436 err = pppol2tp_session_setsockopt(sk, session, optname, val);
1437
1438 err = 0;
1439
1440 end_put_sess:
1441 sock_put(sk);
1442 end:
1443 return err;
1444 }
1445
1446 /* Tunnel getsockopt helper. Called with sock locked.
1447 */
1448 static int pppol2tp_tunnel_getsockopt(struct sock *sk,
1449 struct l2tp_tunnel *tunnel,
1450 int optname, int *val)
1451 {
1452 int err = 0;
1453
1454 switch (optname) {
1455 case PPPOL2TP_SO_DEBUG:
1456 *val = tunnel->debug;
1457 l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: get debug=%x\n",
1458 tunnel->name, tunnel->debug);
1459 break;
1460
1461 default:
1462 err = -ENOPROTOOPT;
1463 break;
1464 }
1465
1466 return err;
1467 }
1468
1469 /* Session getsockopt helper. Called with sock locked.
1470 */
1471 static int pppol2tp_session_getsockopt(struct sock *sk,
1472 struct l2tp_session *session,
1473 int optname, int *val)
1474 {
1475 int err = 0;
1476
1477 switch (optname) {
1478 case PPPOL2TP_SO_RECVSEQ:
1479 *val = session->recv_seq;
1480 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1481 "%s: get recv_seq=%d\n", session->name, *val);
1482 break;
1483
1484 case PPPOL2TP_SO_SENDSEQ:
1485 *val = session->send_seq;
1486 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1487 "%s: get send_seq=%d\n", session->name, *val);
1488 break;
1489
1490 case PPPOL2TP_SO_LNSMODE:
1491 *val = session->lns_mode;
1492 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1493 "%s: get lns_mode=%d\n", session->name, *val);
1494 break;
1495
1496 case PPPOL2TP_SO_DEBUG:
1497 *val = session->debug;
1498 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get debug=%d\n",
1499 session->name, *val);
1500 break;
1501
1502 case PPPOL2TP_SO_REORDERTO:
1503 *val = (int) jiffies_to_msecs(session->reorder_timeout);
1504 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1505 "%s: get reorder_timeout=%d\n", session->name, *val);
1506 break;
1507
1508 default:
1509 err = -ENOPROTOOPT;
1510 }
1511
1512 return err;
1513 }
1514
1515 /* Main getsockopt() entry point.
1516 * Does API checks, then calls either the tunnel or session getsockopt
1517 * handler, according to whether the PPPoX socket is a for a regular session
1518 * or the special tunnel type.
1519 */
1520 static int pppol2tp_getsockopt(struct socket *sock, int level, int optname,
1521 char __user *optval, int __user *optlen)
1522 {
1523 struct sock *sk = sock->sk;
1524 struct l2tp_session *session;
1525 struct l2tp_tunnel *tunnel;
1526 int val, len;
1527 int err;
1528 struct pppol2tp_session *ps;
1529
1530 if (level != SOL_PPPOL2TP)
1531 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1532
1533 if (get_user(len, optlen))
1534 return -EFAULT;
1535
1536 len = min_t(unsigned int, len, sizeof(int));
1537
1538 if (len < 0)
1539 return -EINVAL;
1540
1541 err = -ENOTCONN;
1542 if (sk->sk_user_data == NULL)
1543 goto end;
1544
1545 /* Get the session context */
1546 err = -EBADF;
1547 session = pppol2tp_sock_to_session(sk);
1548 if (session == NULL)
1549 goto end;
1550
1551 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1552 ps = l2tp_session_priv(session);
1553 if ((session->session_id == 0) &&
1554 (session->peer_session_id == 0)) {
1555 err = -EBADF;
1556 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1557 if (tunnel == NULL)
1558 goto end_put_sess;
1559
1560 err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
1561 sock_put(ps->tunnel_sock);
1562 } else
1563 err = pppol2tp_session_getsockopt(sk, session, optname, &val);
1564
1565 err = -EFAULT;
1566 if (put_user(len, optlen))
1567 goto end_put_sess;
1568
1569 if (copy_to_user((void __user *) optval, &val, len))
1570 goto end_put_sess;
1571
1572 err = 0;
1573
1574 end_put_sess:
1575 sock_put(sk);
1576 end:
1577 return err;
1578 }
1579
1580 /*****************************************************************************
1581 * /proc filesystem for debug
1582 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1583 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1584 *****************************************************************************/
1585
1586 static unsigned int pppol2tp_net_id;
1587
1588 #ifdef CONFIG_PROC_FS
1589
1590 struct pppol2tp_seq_data {
1591 struct seq_net_private p;
1592 int tunnel_idx; /* current tunnel */
1593 int session_idx; /* index of session within current tunnel */
1594 struct l2tp_tunnel *tunnel;
1595 struct l2tp_session *session; /* NULL means get next tunnel */
1596 };
1597
1598 static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
1599 {
1600 for (;;) {
1601 pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx);
1602 pd->tunnel_idx++;
1603
1604 if (pd->tunnel == NULL)
1605 break;
1606
1607 /* Ignore L2TPv3 tunnels */
1608 if (pd->tunnel->version < 3)
1609 break;
1610 }
1611 }
1612
1613 static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
1614 {
1615 pd->session = l2tp_session_find_nth(pd->tunnel, pd->session_idx);
1616 pd->session_idx++;
1617
1618 if (pd->session == NULL) {
1619 pd->session_idx = 0;
1620 pppol2tp_next_tunnel(net, pd);
1621 }
1622 }
1623
1624 static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
1625 {
1626 struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
1627 loff_t pos = *offs;
1628 struct net *net;
1629
1630 if (!pos)
1631 goto out;
1632
1633 BUG_ON(m->private == NULL);
1634 pd = m->private;
1635 net = seq_file_net(m);
1636
1637 if (pd->tunnel == NULL)
1638 pppol2tp_next_tunnel(net, pd);
1639 else
1640 pppol2tp_next_session(net, pd);
1641
1642 /* NULL tunnel and session indicates end of list */
1643 if ((pd->tunnel == NULL) && (pd->session == NULL))
1644 pd = NULL;
1645
1646 out:
1647 return pd;
1648 }
1649
1650 static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
1651 {
1652 (*pos)++;
1653 return NULL;
1654 }
1655
1656 static void pppol2tp_seq_stop(struct seq_file *p, void *v)
1657 {
1658 /* nothing to do */
1659 }
1660
1661 static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
1662 {
1663 struct l2tp_tunnel *tunnel = v;
1664
1665 seq_printf(m, "\nTUNNEL '%s', %c %d\n",
1666 tunnel->name,
1667 (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
1668 atomic_read(&tunnel->ref_count) - 1);
1669 seq_printf(m, " %08x %llu/%llu/%llu %llu/%llu/%llu\n",
1670 tunnel->debug,
1671 (unsigned long long)tunnel->stats.tx_packets,
1672 (unsigned long long)tunnel->stats.tx_bytes,
1673 (unsigned long long)tunnel->stats.tx_errors,
1674 (unsigned long long)tunnel->stats.rx_packets,
1675 (unsigned long long)tunnel->stats.rx_bytes,
1676 (unsigned long long)tunnel->stats.rx_errors);
1677 }
1678
1679 static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
1680 {
1681 struct l2tp_session *session = v;
1682 struct l2tp_tunnel *tunnel = session->tunnel;
1683 struct pppol2tp_session *ps = l2tp_session_priv(session);
1684 struct pppox_sock *po = pppox_sk(ps->sock);
1685 u32 ip = 0;
1686 u16 port = 0;
1687
1688 if (tunnel->sock) {
1689 struct inet_sock *inet = inet_sk(tunnel->sock);
1690 ip = ntohl(inet->inet_saddr);
1691 port = ntohs(inet->inet_sport);
1692 }
1693
1694 seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
1695 "%04X/%04X %d %c\n",
1696 session->name, ip, port,
1697 tunnel->tunnel_id,
1698 session->session_id,
1699 tunnel->peer_tunnel_id,
1700 session->peer_session_id,
1701 ps->sock->sk_state,
1702 (session == ps->sock->sk_user_data) ?
1703 'Y' : 'N');
1704 seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n",
1705 session->mtu, session->mru,
1706 session->recv_seq ? 'R' : '-',
1707 session->send_seq ? 'S' : '-',
1708 session->lns_mode ? "LNS" : "LAC",
1709 session->debug,
1710 jiffies_to_msecs(session->reorder_timeout));
1711 seq_printf(m, " %hu/%hu %llu/%llu/%llu %llu/%llu/%llu\n",
1712 session->nr, session->ns,
1713 (unsigned long long)session->stats.tx_packets,
1714 (unsigned long long)session->stats.tx_bytes,
1715 (unsigned long long)session->stats.tx_errors,
1716 (unsigned long long)session->stats.rx_packets,
1717 (unsigned long long)session->stats.rx_bytes,
1718 (unsigned long long)session->stats.rx_errors);
1719
1720 if (po)
1721 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
1722 }
1723
1724 static int pppol2tp_seq_show(struct seq_file *m, void *v)
1725 {
1726 struct pppol2tp_seq_data *pd = v;
1727
1728 /* display header on line 1 */
1729 if (v == SEQ_START_TOKEN) {
1730 seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
1731 seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
1732 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1733 seq_puts(m, " SESSION name, addr/port src-tid/sid "
1734 "dest-tid/sid state user-data-ok\n");
1735 seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1736 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1737 goto out;
1738 }
1739
1740 /* Show the tunnel or session context.
1741 */
1742 if (pd->session == NULL)
1743 pppol2tp_seq_tunnel_show(m, pd->tunnel);
1744 else
1745 pppol2tp_seq_session_show(m, pd->session);
1746
1747 out:
1748 return 0;
1749 }
1750
1751 static const struct seq_operations pppol2tp_seq_ops = {
1752 .start = pppol2tp_seq_start,
1753 .next = pppol2tp_seq_next,
1754 .stop = pppol2tp_seq_stop,
1755 .show = pppol2tp_seq_show,
1756 };
1757
1758 /* Called when our /proc file is opened. We allocate data for use when
1759 * iterating our tunnel / session contexts and store it in the private
1760 * data of the seq_file.
1761 */
1762 static int pppol2tp_proc_open(struct inode *inode, struct file *file)
1763 {
1764 return seq_open_net(inode, file, &pppol2tp_seq_ops,
1765 sizeof(struct pppol2tp_seq_data));
1766 }
1767
1768 static const struct file_operations pppol2tp_proc_fops = {
1769 .owner = THIS_MODULE,
1770 .open = pppol2tp_proc_open,
1771 .read = seq_read,
1772 .llseek = seq_lseek,
1773 .release = seq_release_net,
1774 };
1775
1776 #endif /* CONFIG_PROC_FS */
1777
1778 /*****************************************************************************
1779 * Network namespace
1780 *****************************************************************************/
1781
1782 static __net_init int pppol2tp_init_net(struct net *net)
1783 {
1784 struct proc_dir_entry *pde;
1785 int err = 0;
1786
1787 pde = proc_create("pppol2tp", S_IRUGO, net->proc_net,
1788 &pppol2tp_proc_fops);
1789 if (!pde) {
1790 err = -ENOMEM;
1791 goto out;
1792 }
1793
1794 out:
1795 return err;
1796 }
1797
1798 static __net_exit void pppol2tp_exit_net(struct net *net)
1799 {
1800 remove_proc_entry("pppol2tp", net->proc_net);
1801 }
1802
1803 static struct pernet_operations pppol2tp_net_ops = {
1804 .init = pppol2tp_init_net,
1805 .exit = pppol2tp_exit_net,
1806 .id = &pppol2tp_net_id,
1807 };
1808
1809 /*****************************************************************************
1810 * Init and cleanup
1811 *****************************************************************************/
1812
1813 static const struct proto_ops pppol2tp_ops = {
1814 .family = AF_PPPOX,
1815 .owner = THIS_MODULE,
1816 .release = pppol2tp_release,
1817 .bind = sock_no_bind,
1818 .connect = pppol2tp_connect,
1819 .socketpair = sock_no_socketpair,
1820 .accept = sock_no_accept,
1821 .getname = pppol2tp_getname,
1822 .poll = datagram_poll,
1823 .listen = sock_no_listen,
1824 .shutdown = sock_no_shutdown,
1825 .setsockopt = pppol2tp_setsockopt,
1826 .getsockopt = pppol2tp_getsockopt,
1827 .sendmsg = pppol2tp_sendmsg,
1828 .recvmsg = pppol2tp_recvmsg,
1829 .mmap = sock_no_mmap,
1830 .ioctl = pppox_ioctl,
1831 };
1832
1833 static const struct pppox_proto pppol2tp_proto = {
1834 .create = pppol2tp_create,
1835 .ioctl = pppol2tp_ioctl
1836 };
1837
1838 #ifdef CONFIG_L2TP_V3
1839
1840 static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = {
1841 .session_create = pppol2tp_session_create,
1842 .session_delete = pppol2tp_session_delete,
1843 };
1844
1845 #endif /* CONFIG_L2TP_V3 */
1846
1847 static int __init pppol2tp_init(void)
1848 {
1849 int err;
1850
1851 err = register_pernet_device(&pppol2tp_net_ops);
1852 if (err)
1853 goto out;
1854
1855 err = proto_register(&pppol2tp_sk_proto, 0);
1856 if (err)
1857 goto out_unregister_pppol2tp_pernet;
1858
1859 err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
1860 if (err)
1861 goto out_unregister_pppol2tp_proto;
1862
1863 #ifdef CONFIG_L2TP_V3
1864 err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops);
1865 if (err)
1866 goto out_unregister_pppox;
1867 #endif
1868
1869 pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION);
1870
1871 out:
1872 return err;
1873
1874 #ifdef CONFIG_L2TP_V3
1875 out_unregister_pppox:
1876 unregister_pppox_proto(PX_PROTO_OL2TP);
1877 #endif
1878 out_unregister_pppol2tp_proto:
1879 proto_unregister(&pppol2tp_sk_proto);
1880 out_unregister_pppol2tp_pernet:
1881 unregister_pernet_device(&pppol2tp_net_ops);
1882 goto out;
1883 }
1884
1885 static void __exit pppol2tp_exit(void)
1886 {
1887 #ifdef CONFIG_L2TP_V3
1888 l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP);
1889 #endif
1890 unregister_pppox_proto(PX_PROTO_OL2TP);
1891 proto_unregister(&pppol2tp_sk_proto);
1892 unregister_pernet_device(&pppol2tp_net_ops);
1893 }
1894
1895 module_init(pppol2tp_init);
1896 module_exit(pppol2tp_exit);
1897
1898 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1899 MODULE_DESCRIPTION("PPP over L2TP over UDP");
1900 MODULE_LICENSE("GPL");
1901 MODULE_VERSION(PPPOL2TP_DRV_VERSION);
1902 MODULE_ALIAS("pppox-proto-" __stringify(PX_PROTO_OL2TP));
CJK support for tty framebuffer vt