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thermal: fix Mediatek thermal controller build
[linux/fpc-iii.git] / net / l2tp / l2tp_ppp.c
blob652c250b9a3b8fd9ad7b6aefb63f538dcf099bbc
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 #include <net/inet_common.h>
101
102 #include <asm/byteorder.h>
103 #include <linux/atomic.h>
104
105 #include "l2tp_core.h"
106
107 #define PPPOL2TP_DRV_VERSION "V2.0"
108
109 /* Space for UDP, L2TP and PPP headers */
110 #define PPPOL2TP_HEADER_OVERHEAD 40
111
112 /* Number of bytes to build transmit L2TP headers.
113 * Unfortunately the size is different depending on whether sequence numbers
114 * are enabled.
115 */
116 #define PPPOL2TP_L2TP_HDR_SIZE_SEQ 10
117 #define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ 6
118
119 /* Private data of each session. This data lives at the end of struct
120 * l2tp_session, referenced via session->priv[].
121 */
122 struct pppol2tp_session {
123 int owner; /* pid that opened the socket */
124
125 struct sock *sock; /* Pointer to the session
126 * PPPoX socket */
127 struct sock *tunnel_sock; /* Pointer to the tunnel UDP
128 * socket */
129 int flags; /* accessed by PPPIOCGFLAGS.
130 * Unused. */
131 };
132
133 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb);
134
135 static const struct ppp_channel_ops pppol2tp_chan_ops = {
136 .start_xmit = pppol2tp_xmit,
137 };
138
139 static const struct proto_ops pppol2tp_ops;
140
141 /* Helpers to obtain tunnel/session contexts from sockets.
142 */
143 static inline struct l2tp_session *pppol2tp_sock_to_session(struct sock *sk)
144 {
145 struct l2tp_session *session;
146
147 if (sk == NULL)
148 return NULL;
149
150 sock_hold(sk);
151 session = (struct l2tp_session *)(sk->sk_user_data);
152 if (session == NULL) {
153 sock_put(sk);
154 goto out;
155 }
156
157 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
158
159 out:
160 return session;
161 }
162
163 /*****************************************************************************
164 * Receive data handling
165 *****************************************************************************/
166
167 static int pppol2tp_recv_payload_hook(struct sk_buff *skb)
168 {
169 /* Skip PPP header, if present. In testing, Microsoft L2TP clients
170 * don't send the PPP header (PPP header compression enabled), but
171 * other clients can include the header. So we cope with both cases
172 * here. The PPP header is always FF03 when using L2TP.
173 *
174 * Note that skb->data[] isn't dereferenced from a u16 ptr here since
175 * the field may be unaligned.
176 */
177 if (!pskb_may_pull(skb, 2))
178 return 1;
179
180 if ((skb->data[0] == 0xff) && (skb->data[1] == 0x03))
181 skb_pull(skb, 2);
182
183 return 0;
184 }
185
186 /* Receive message. This is the recvmsg for the PPPoL2TP socket.
187 */
188 static int pppol2tp_recvmsg(struct socket *sock, struct msghdr *msg,
189 size_t len, 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 err = 0;
200 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
201 flags & MSG_DONTWAIT, &err);
202 if (!skb)
203 goto end;
204
205 if (len > skb->len)
206 len = skb->len;
207 else if (len < skb->len)
208 msg->msg_flags |= MSG_TRUNC;
209
210 err = skb_copy_datagram_msg(skb, 0, msg, len);
211 if (likely(err == 0))
212 err = len;
213
214 kfree_skb(skb);
215 end:
216 return err;
217 }
218
219 static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
220 {
221 struct pppol2tp_session *ps = l2tp_session_priv(session);
222 struct sock *sk = NULL;
223
224 /* If the socket is bound, send it in to PPP's input queue. Otherwise
225 * queue it on the session socket.
226 */
227 sk = ps->sock;
228 if (sk == NULL)
229 goto no_sock;
230
231 if (sk->sk_state & PPPOX_BOUND) {
232 struct pppox_sock *po;
233
234 l2tp_dbg(session, PPPOL2TP_MSG_DATA,
235 "%s: recv %d byte data frame, passing to ppp\n",
236 session->name, data_len);
237
238 po = pppox_sk(sk);
239 ppp_input(&po->chan, skb);
240 } else {
241 l2tp_dbg(session, PPPOL2TP_MSG_DATA,
242 "%s: recv %d byte data frame, passing to L2TP socket\n",
243 session->name, data_len);
244
245 if (sock_queue_rcv_skb(sk, skb) < 0) {
246 atomic_long_inc(&session->stats.rx_errors);
247 kfree_skb(skb);
248 }
249 }
250
251 return;
252
253 no_sock:
254 l2tp_info(session, PPPOL2TP_MSG_DATA, "%s: no socket\n", session->name);
255 kfree_skb(skb);
256 }
257
258 static void pppol2tp_session_sock_hold(struct l2tp_session *session)
259 {
260 struct pppol2tp_session *ps = l2tp_session_priv(session);
261
262 if (ps->sock)
263 sock_hold(ps->sock);
264 }
265
266 static void pppol2tp_session_sock_put(struct l2tp_session *session)
267 {
268 struct pppol2tp_session *ps = l2tp_session_priv(session);
269
270 if (ps->sock)
271 sock_put(ps->sock);
272 }
273
274 /************************************************************************
275 * Transmit handling
276 ***********************************************************************/
277
278 /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here
279 * when a user application does a sendmsg() on the session socket. L2TP and
280 * PPP headers must be inserted into the user's data.
281 */
282 static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m,
283 size_t total_len)
284 {
285 static const unsigned char ppph[2] = { 0xff, 0x03 };
286 struct sock *sk = sock->sk;
287 struct sk_buff *skb;
288 int error;
289 struct l2tp_session *session;
290 struct l2tp_tunnel *tunnel;
291 struct pppol2tp_session *ps;
292 int uhlen;
293
294 error = -ENOTCONN;
295 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
296 goto error;
297
298 /* Get session and tunnel contexts */
299 error = -EBADF;
300 session = pppol2tp_sock_to_session(sk);
301 if (session == NULL)
302 goto error;
303
304 ps = l2tp_session_priv(session);
305 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
306 if (tunnel == NULL)
307 goto error_put_sess;
308
309 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
310
311 /* Allocate a socket buffer */
312 error = -ENOMEM;
313 skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) +
314 uhlen + session->hdr_len +
315 sizeof(ppph) + total_len,
316 0, GFP_KERNEL);
317 if (!skb)
318 goto error_put_sess_tun;
319
320 /* Reserve space for headers. */
321 skb_reserve(skb, NET_SKB_PAD);
322 skb_reset_network_header(skb);
323 skb_reserve(skb, sizeof(struct iphdr));
324 skb_reset_transport_header(skb);
325 skb_reserve(skb, uhlen);
326
327 /* Add PPP header */
328 skb->data[0] = ppph[0];
329 skb->data[1] = ppph[1];
330 skb_put(skb, 2);
331
332 /* Copy user data into skb */
333 error = memcpy_from_msg(skb_put(skb, total_len), m, total_len);
334 if (error < 0) {
335 kfree_skb(skb);
336 goto error_put_sess_tun;
337 }
338
339 local_bh_disable();
340 l2tp_xmit_skb(session, skb, session->hdr_len);
341 local_bh_enable();
342
343 sock_put(ps->tunnel_sock);
344 sock_put(sk);
345
346 return total_len;
347
348 error_put_sess_tun:
349 sock_put(ps->tunnel_sock);
350 error_put_sess:
351 sock_put(sk);
352 error:
353 return error;
354 }
355
356 /* Transmit function called by generic PPP driver. Sends PPP frame
357 * over PPPoL2TP socket.
358 *
359 * This is almost the same as pppol2tp_sendmsg(), but rather than
360 * being called with a msghdr from userspace, it is called with a skb
361 * from the kernel.
362 *
363 * The supplied skb from ppp doesn't have enough headroom for the
364 * insertion of L2TP, UDP and IP headers so we need to allocate more
365 * headroom in the skb. This will create a cloned skb. But we must be
366 * careful in the error case because the caller will expect to free
367 * the skb it supplied, not our cloned skb. So we take care to always
368 * leave the original skb unfreed if we return an error.
369 */
370 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
371 {
372 static const u8 ppph[2] = { 0xff, 0x03 };
373 struct sock *sk = (struct sock *) chan->private;
374 struct sock *sk_tun;
375 struct l2tp_session *session;
376 struct l2tp_tunnel *tunnel;
377 struct pppol2tp_session *ps;
378 int uhlen, headroom;
379
380 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
381 goto abort;
382
383 /* Get session and tunnel contexts from the socket */
384 session = pppol2tp_sock_to_session(sk);
385 if (session == NULL)
386 goto abort;
387
388 ps = l2tp_session_priv(session);
389 sk_tun = ps->tunnel_sock;
390 if (sk_tun == NULL)
391 goto abort_put_sess;
392 tunnel = l2tp_sock_to_tunnel(sk_tun);
393 if (tunnel == NULL)
394 goto abort_put_sess;
395
396 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
397 headroom = NET_SKB_PAD +
398 sizeof(struct iphdr) + /* IP header */
399 uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */
400 session->hdr_len + /* L2TP header */
401 sizeof(ppph); /* PPP header */
402 if (skb_cow_head(skb, headroom))
403 goto abort_put_sess_tun;
404
405 /* Setup PPP header */
406 __skb_push(skb, sizeof(ppph));
407 skb->data[0] = ppph[0];
408 skb->data[1] = ppph[1];
409
410 local_bh_disable();
411 l2tp_xmit_skb(session, skb, session->hdr_len);
412 local_bh_enable();
413
414 sock_put(sk_tun);
415 sock_put(sk);
416 return 1;
417
418 abort_put_sess_tun:
419 sock_put(sk_tun);
420 abort_put_sess:
421 sock_put(sk);
422 abort:
423 /* Free the original skb */
424 kfree_skb(skb);
425 return 1;
426 }
427
428 /*****************************************************************************
429 * Session (and tunnel control) socket create/destroy.
430 *****************************************************************************/
431
432 /* Called by l2tp_core when a session socket is being closed.
433 */
434 static void pppol2tp_session_close(struct l2tp_session *session)
435 {
436 struct pppol2tp_session *ps = l2tp_session_priv(session);
437 struct sock *sk = ps->sock;
438 struct socket *sock = sk->sk_socket;
439
440 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
441
442 if (sock) {
443 inet_shutdown(sock, 2);
444 /* Don't let the session go away before our socket does */
445 l2tp_session_inc_refcount(session);
446 }
447 }
448
449 /* Really kill the session socket. (Called from sock_put() if
450 * refcnt == 0.)
451 */
452 static void pppol2tp_session_destruct(struct sock *sk)
453 {
454 struct l2tp_session *session = sk->sk_user_data;
455 if (session) {
456 sk->sk_user_data = NULL;
457 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
458 l2tp_session_dec_refcount(session);
459 }
460 }
461
462 /* Called when the PPPoX socket (session) is closed.
463 */
464 static int pppol2tp_release(struct socket *sock)
465 {
466 struct sock *sk = sock->sk;
467 struct l2tp_session *session;
468 int error;
469
470 if (!sk)
471 return 0;
472
473 error = -EBADF;
474 lock_sock(sk);
475 if (sock_flag(sk, SOCK_DEAD) != 0)
476 goto error;
477
478 pppox_unbind_sock(sk);
479
480 /* Signal the death of the socket. */
481 sk->sk_state = PPPOX_DEAD;
482 sock_orphan(sk);
483 sock->sk = NULL;
484
485 session = pppol2tp_sock_to_session(sk);
486
487 /* Purge any queued data */
488 if (session != NULL) {
489 __l2tp_session_unhash(session);
490 l2tp_session_queue_purge(session);
491 sock_put(sk);
492 }
493 skb_queue_purge(&sk->sk_receive_queue);
494 skb_queue_purge(&sk->sk_write_queue);
495
496 release_sock(sk);
497
498 /* This will delete the session context via
499 * pppol2tp_session_destruct() if the socket's refcnt drops to
500 * zero.
501 */
502 sock_put(sk);
503
504 return 0;
505
506 error:
507 release_sock(sk);
508 return error;
509 }
510
511 static struct proto pppol2tp_sk_proto = {
512 .name = "PPPOL2TP",
513 .owner = THIS_MODULE,
514 .obj_size = sizeof(struct pppox_sock),
515 };
516
517 static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb)
518 {
519 int rc;
520
521 rc = l2tp_udp_encap_recv(sk, skb);
522 if (rc)
523 kfree_skb(skb);
524
525 return NET_RX_SUCCESS;
526 }
527
528 /* socket() handler. Initialize a new struct sock.
529 */
530 static int pppol2tp_create(struct net *net, struct socket *sock, int kern)
531 {
532 int error = -ENOMEM;
533 struct sock *sk;
534
535 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto, kern);
536 if (!sk)
537 goto out;
538
539 sock_init_data(sock, sk);
540
541 sock->state = SS_UNCONNECTED;
542 sock->ops = &pppol2tp_ops;
543
544 sk->sk_backlog_rcv = pppol2tp_backlog_recv;
545 sk->sk_protocol = PX_PROTO_OL2TP;
546 sk->sk_family = PF_PPPOX;
547 sk->sk_state = PPPOX_NONE;
548 sk->sk_type = SOCK_STREAM;
549 sk->sk_destruct = pppol2tp_session_destruct;
550
551 error = 0;
552
553 out:
554 return error;
555 }
556
557 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
558 static void pppol2tp_show(struct seq_file *m, void *arg)
559 {
560 struct l2tp_session *session = arg;
561 struct pppol2tp_session *ps = l2tp_session_priv(session);
562
563 if (ps) {
564 struct pppox_sock *po = pppox_sk(ps->sock);
565 if (po)
566 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
567 }
568 }
569 #endif
570
571 /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
572 */
573 static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
574 int sockaddr_len, int flags)
575 {
576 struct sock *sk = sock->sk;
577 struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr;
578 struct pppox_sock *po = pppox_sk(sk);
579 struct l2tp_session *session = NULL;
580 struct l2tp_tunnel *tunnel;
581 struct pppol2tp_session *ps;
582 struct dst_entry *dst;
583 struct l2tp_session_cfg cfg = { 0, };
584 int error = 0;
585 u32 tunnel_id, peer_tunnel_id;
586 u32 session_id, peer_session_id;
587 int ver = 2;
588 int fd;
589
590 lock_sock(sk);
591
592 error = -EINVAL;
593 if (sp->sa_protocol != PX_PROTO_OL2TP)
594 goto end;
595
596 /* Check for already bound sockets */
597 error = -EBUSY;
598 if (sk->sk_state & PPPOX_CONNECTED)
599 goto end;
600
601 /* We don't supporting rebinding anyway */
602 error = -EALREADY;
603 if (sk->sk_user_data)
604 goto end; /* socket is already attached */
605
606 /* Get params from socket address. Handle L2TPv2 and L2TPv3.
607 * This is nasty because there are different sockaddr_pppol2tp
608 * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use
609 * the sockaddr size to determine which structure the caller
610 * is using.
611 */
612 peer_tunnel_id = 0;
613 if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) {
614 fd = sp->pppol2tp.fd;
615 tunnel_id = sp->pppol2tp.s_tunnel;
616 peer_tunnel_id = sp->pppol2tp.d_tunnel;
617 session_id = sp->pppol2tp.s_session;
618 peer_session_id = sp->pppol2tp.d_session;
619 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) {
620 struct sockaddr_pppol2tpv3 *sp3 =
621 (struct sockaddr_pppol2tpv3 *) sp;
622 ver = 3;
623 fd = sp3->pppol2tp.fd;
624 tunnel_id = sp3->pppol2tp.s_tunnel;
625 peer_tunnel_id = sp3->pppol2tp.d_tunnel;
626 session_id = sp3->pppol2tp.s_session;
627 peer_session_id = sp3->pppol2tp.d_session;
628 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpin6)) {
629 struct sockaddr_pppol2tpin6 *sp6 =
630 (struct sockaddr_pppol2tpin6 *) sp;
631 fd = sp6->pppol2tp.fd;
632 tunnel_id = sp6->pppol2tp.s_tunnel;
633 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
634 session_id = sp6->pppol2tp.s_session;
635 peer_session_id = sp6->pppol2tp.d_session;
636 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3in6)) {
637 struct sockaddr_pppol2tpv3in6 *sp6 =
638 (struct sockaddr_pppol2tpv3in6 *) sp;
639 ver = 3;
640 fd = sp6->pppol2tp.fd;
641 tunnel_id = sp6->pppol2tp.s_tunnel;
642 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
643 session_id = sp6->pppol2tp.s_session;
644 peer_session_id = sp6->pppol2tp.d_session;
645 } else {
646 error = -EINVAL;
647 goto end; /* bad socket address */
648 }
649
650 /* Don't bind if tunnel_id is 0 */
651 error = -EINVAL;
652 if (tunnel_id == 0)
653 goto end;
654
655 tunnel = l2tp_tunnel_find(sock_net(sk), tunnel_id);
656
657 /* Special case: create tunnel context if session_id and
658 * peer_session_id is 0. Otherwise look up tunnel using supplied
659 * tunnel id.
660 */
661 if ((session_id == 0) && (peer_session_id == 0)) {
662 if (tunnel == NULL) {
663 struct l2tp_tunnel_cfg tcfg = {
664 .encap = L2TP_ENCAPTYPE_UDP,
665 .debug = 0,
666 };
667 error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel);
668 if (error < 0)
669 goto end;
670 }
671 } else {
672 /* Error if we can't find the tunnel */
673 error = -ENOENT;
674 if (tunnel == NULL)
675 goto end;
676
677 /* Error if socket is not prepped */
678 if (tunnel->sock == NULL)
679 goto end;
680 }
681
682 if (tunnel->recv_payload_hook == NULL)
683 tunnel->recv_payload_hook = pppol2tp_recv_payload_hook;
684
685 if (tunnel->peer_tunnel_id == 0)
686 tunnel->peer_tunnel_id = peer_tunnel_id;
687
688 /* Create session if it doesn't already exist. We handle the
689 * case where a session was previously created by the netlink
690 * interface by checking that the session doesn't already have
691 * a socket and its tunnel socket are what we expect. If any
692 * of those checks fail, return EEXIST to the caller.
693 */
694 session = l2tp_session_find(sock_net(sk), tunnel, session_id);
695 if (session == NULL) {
696 /* Default MTU must allow space for UDP/L2TP/PPP
697 * headers.
698 */
699 cfg.mtu = cfg.mru = 1500 - PPPOL2TP_HEADER_OVERHEAD;
700
701 /* Allocate and initialize a new session context. */
702 session = l2tp_session_create(sizeof(struct pppol2tp_session),
703 tunnel, session_id,
704 peer_session_id, &cfg);
705 if (session == NULL) {
706 error = -ENOMEM;
707 goto end;
708 }
709 } else {
710 ps = l2tp_session_priv(session);
711 error = -EEXIST;
712 if (ps->sock != NULL)
713 goto end;
714
715 /* consistency checks */
716 if (ps->tunnel_sock != tunnel->sock)
717 goto end;
718 }
719
720 /* Associate session with its PPPoL2TP socket */
721 ps = l2tp_session_priv(session);
722 ps->owner = current->pid;
723 ps->sock = sk;
724 ps->tunnel_sock = tunnel->sock;
725
726 session->recv_skb = pppol2tp_recv;
727 session->session_close = pppol2tp_session_close;
728 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
729 session->show = pppol2tp_show;
730 #endif
731
732 /* We need to know each time a skb is dropped from the reorder
733 * queue.
734 */
735 session->ref = pppol2tp_session_sock_hold;
736 session->deref = pppol2tp_session_sock_put;
737
738 /* If PMTU discovery was enabled, use the MTU that was discovered */
739 dst = sk_dst_get(tunnel->sock);
740 if (dst != NULL) {
741 u32 pmtu = dst_mtu(dst);
742
743 if (pmtu != 0)
744 session->mtu = session->mru = pmtu -
745 PPPOL2TP_HEADER_OVERHEAD;
746 dst_release(dst);
747 }
748
749 /* Special case: if source & dest session_id == 0x0000, this
750 * socket is being created to manage the tunnel. Just set up
751 * the internal context for use by ioctl() and sockopt()
752 * handlers.
753 */
754 if ((session->session_id == 0) &&
755 (session->peer_session_id == 0)) {
756 error = 0;
757 goto out_no_ppp;
758 }
759
760 /* The only header we need to worry about is the L2TP
761 * header. This size is different depending on whether
762 * sequence numbers are enabled for the data channel.
763 */
764 po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
765
766 po->chan.private = sk;
767 po->chan.ops = &pppol2tp_chan_ops;
768 po->chan.mtu = session->mtu;
769
770 error = ppp_register_net_channel(sock_net(sk), &po->chan);
771 if (error)
772 goto end;
773
774 out_no_ppp:
775 /* This is how we get the session context from the socket. */
776 sk->sk_user_data = session;
777 sk->sk_state = PPPOX_CONNECTED;
778 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: created\n",
779 session->name);
780
781 end:
782 release_sock(sk);
783
784 return error;
785 }
786
787 #ifdef CONFIG_L2TP_V3
788
789 /* Called when creating sessions via the netlink interface.
790 */
791 static int pppol2tp_session_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg)
792 {
793 int error;
794 struct l2tp_tunnel *tunnel;
795 struct l2tp_session *session;
796 struct pppol2tp_session *ps;
797
798 tunnel = l2tp_tunnel_find(net, tunnel_id);
799
800 /* Error if we can't find the tunnel */
801 error = -ENOENT;
802 if (tunnel == NULL)
803 goto out;
804
805 /* Error if tunnel socket is not prepped */
806 if (tunnel->sock == NULL)
807 goto out;
808
809 /* Check that this session doesn't already exist */
810 error = -EEXIST;
811 session = l2tp_session_find(net, tunnel, session_id);
812 if (session != NULL)
813 goto out;
814
815 /* Default MTU values. */
816 if (cfg->mtu == 0)
817 cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
818 if (cfg->mru == 0)
819 cfg->mru = cfg->mtu;
820
821 /* Allocate and initialize a new session context. */
822 error = -ENOMEM;
823 session = l2tp_session_create(sizeof(struct pppol2tp_session),
824 tunnel, session_id,
825 peer_session_id, cfg);
826 if (session == NULL)
827 goto out;
828
829 ps = l2tp_session_priv(session);
830 ps->tunnel_sock = tunnel->sock;
831
832 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: created\n",
833 session->name);
834
835 error = 0;
836
837 out:
838 return error;
839 }
840
841 #endif /* CONFIG_L2TP_V3 */
842
843 /* getname() support.
844 */
845 static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
846 int *usockaddr_len, int peer)
847 {
848 int len = 0;
849 int error = 0;
850 struct l2tp_session *session;
851 struct l2tp_tunnel *tunnel;
852 struct sock *sk = sock->sk;
853 struct inet_sock *inet;
854 struct pppol2tp_session *pls;
855
856 error = -ENOTCONN;
857 if (sk == NULL)
858 goto end;
859 if (sk->sk_state != PPPOX_CONNECTED)
860 goto end;
861
862 error = -EBADF;
863 session = pppol2tp_sock_to_session(sk);
864 if (session == NULL)
865 goto end;
866
867 pls = l2tp_session_priv(session);
868 tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock);
869 if (tunnel == NULL) {
870 error = -EBADF;
871 goto end_put_sess;
872 }
873
874 inet = inet_sk(tunnel->sock);
875 if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) {
876 struct sockaddr_pppol2tp sp;
877 len = sizeof(sp);
878 memset(&sp, 0, len);
879 sp.sa_family = AF_PPPOX;
880 sp.sa_protocol = PX_PROTO_OL2TP;
881 sp.pppol2tp.fd = tunnel->fd;
882 sp.pppol2tp.pid = pls->owner;
883 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
884 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
885 sp.pppol2tp.s_session = session->session_id;
886 sp.pppol2tp.d_session = session->peer_session_id;
887 sp.pppol2tp.addr.sin_family = AF_INET;
888 sp.pppol2tp.addr.sin_port = inet->inet_dport;
889 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
890 memcpy(uaddr, &sp, len);
891 #if IS_ENABLED(CONFIG_IPV6)
892 } else if ((tunnel->version == 2) &&
893 (tunnel->sock->sk_family == AF_INET6)) {
894 struct sockaddr_pppol2tpin6 sp;
895
896 len = sizeof(sp);
897 memset(&sp, 0, len);
898 sp.sa_family = AF_PPPOX;
899 sp.sa_protocol = PX_PROTO_OL2TP;
900 sp.pppol2tp.fd = tunnel->fd;
901 sp.pppol2tp.pid = pls->owner;
902 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
903 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
904 sp.pppol2tp.s_session = session->session_id;
905 sp.pppol2tp.d_session = session->peer_session_id;
906 sp.pppol2tp.addr.sin6_family = AF_INET6;
907 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
908 memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
909 sizeof(tunnel->sock->sk_v6_daddr));
910 memcpy(uaddr, &sp, len);
911 } else if ((tunnel->version == 3) &&
912 (tunnel->sock->sk_family == AF_INET6)) {
913 struct sockaddr_pppol2tpv3in6 sp;
914
915 len = sizeof(sp);
916 memset(&sp, 0, len);
917 sp.sa_family = AF_PPPOX;
918 sp.sa_protocol = PX_PROTO_OL2TP;
919 sp.pppol2tp.fd = tunnel->fd;
920 sp.pppol2tp.pid = pls->owner;
921 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
922 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
923 sp.pppol2tp.s_session = session->session_id;
924 sp.pppol2tp.d_session = session->peer_session_id;
925 sp.pppol2tp.addr.sin6_family = AF_INET6;
926 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
927 memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
928 sizeof(tunnel->sock->sk_v6_daddr));
929 memcpy(uaddr, &sp, len);
930 #endif
931 } else if (tunnel->version == 3) {
932 struct sockaddr_pppol2tpv3 sp;
933 len = sizeof(sp);
934 memset(&sp, 0, len);
935 sp.sa_family = AF_PPPOX;
936 sp.sa_protocol = PX_PROTO_OL2TP;
937 sp.pppol2tp.fd = tunnel->fd;
938 sp.pppol2tp.pid = pls->owner;
939 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
940 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
941 sp.pppol2tp.s_session = session->session_id;
942 sp.pppol2tp.d_session = session->peer_session_id;
943 sp.pppol2tp.addr.sin_family = AF_INET;
944 sp.pppol2tp.addr.sin_port = inet->inet_dport;
945 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
946 memcpy(uaddr, &sp, len);
947 }
948
949 *usockaddr_len = len;
950
951 sock_put(pls->tunnel_sock);
952 end_put_sess:
953 sock_put(sk);
954 error = 0;
955
956 end:
957 return error;
958 }
959
960 /****************************************************************************
961 * ioctl() handlers.
962 *
963 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
964 * sockets. However, in order to control kernel tunnel features, we allow
965 * userspace to create a special "tunnel" PPPoX socket which is used for
966 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
967 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
968 * calls.
969 ****************************************************************************/
970
971 static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest,
972 struct l2tp_stats *stats)
973 {
974 dest->tx_packets = atomic_long_read(&stats->tx_packets);
975 dest->tx_bytes = atomic_long_read(&stats->tx_bytes);
976 dest->tx_errors = atomic_long_read(&stats->tx_errors);
977 dest->rx_packets = atomic_long_read(&stats->rx_packets);
978 dest->rx_bytes = atomic_long_read(&stats->rx_bytes);
979 dest->rx_seq_discards = atomic_long_read(&stats->rx_seq_discards);
980 dest->rx_oos_packets = atomic_long_read(&stats->rx_oos_packets);
981 dest->rx_errors = atomic_long_read(&stats->rx_errors);
982 }
983
984 /* Session ioctl helper.
985 */
986 static int pppol2tp_session_ioctl(struct l2tp_session *session,
987 unsigned int cmd, unsigned long arg)
988 {
989 struct ifreq ifr;
990 int err = 0;
991 struct sock *sk;
992 int val = (int) arg;
993 struct pppol2tp_session *ps = l2tp_session_priv(session);
994 struct l2tp_tunnel *tunnel = session->tunnel;
995 struct pppol2tp_ioc_stats stats;
996
997 l2tp_dbg(session, PPPOL2TP_MSG_CONTROL,
998 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
999 session->name, cmd, arg);
1000
1001 sk = ps->sock;
1002 sock_hold(sk);
1003
1004 switch (cmd) {
1005 case SIOCGIFMTU:
1006 err = -ENXIO;
1007 if (!(sk->sk_state & PPPOX_CONNECTED))
1008 break;
1009
1010 err = -EFAULT;
1011 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1012 break;
1013 ifr.ifr_mtu = session->mtu;
1014 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
1015 break;
1016
1017 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get mtu=%d\n",
1018 session->name, session->mtu);
1019 err = 0;
1020 break;
1021
1022 case SIOCSIFMTU:
1023 err = -ENXIO;
1024 if (!(sk->sk_state & PPPOX_CONNECTED))
1025 break;
1026
1027 err = -EFAULT;
1028 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1029 break;
1030
1031 session->mtu = ifr.ifr_mtu;
1032
1033 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set mtu=%d\n",
1034 session->name, session->mtu);
1035 err = 0;
1036 break;
1037
1038 case PPPIOCGMRU:
1039 err = -ENXIO;
1040 if (!(sk->sk_state & PPPOX_CONNECTED))
1041 break;
1042
1043 err = -EFAULT;
1044 if (put_user(session->mru, (int __user *) arg))
1045 break;
1046
1047 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get mru=%d\n",
1048 session->name, session->mru);
1049 err = 0;
1050 break;
1051
1052 case PPPIOCSMRU:
1053 err = -ENXIO;
1054 if (!(sk->sk_state & PPPOX_CONNECTED))
1055 break;
1056
1057 err = -EFAULT;
1058 if (get_user(val, (int __user *) arg))
1059 break;
1060
1061 session->mru = val;
1062 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set mru=%d\n",
1063 session->name, session->mru);
1064 err = 0;
1065 break;
1066
1067 case PPPIOCGFLAGS:
1068 err = -EFAULT;
1069 if (put_user(ps->flags, (int __user *) arg))
1070 break;
1071
1072 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get flags=%d\n",
1073 session->name, ps->flags);
1074 err = 0;
1075 break;
1076
1077 case PPPIOCSFLAGS:
1078 err = -EFAULT;
1079 if (get_user(val, (int __user *) arg))
1080 break;
1081 ps->flags = val;
1082 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set flags=%d\n",
1083 session->name, ps->flags);
1084 err = 0;
1085 break;
1086
1087 case PPPIOCGL2TPSTATS:
1088 err = -ENXIO;
1089 if (!(sk->sk_state & PPPOX_CONNECTED))
1090 break;
1091
1092 memset(&stats, 0, sizeof(stats));
1093 stats.tunnel_id = tunnel->tunnel_id;
1094 stats.session_id = session->session_id;
1095 pppol2tp_copy_stats(&stats, &session->stats);
1096 if (copy_to_user((void __user *) arg, &stats,
1097 sizeof(stats)))
1098 break;
1099 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1100 session->name);
1101 err = 0;
1102 break;
1103
1104 default:
1105 err = -ENOSYS;
1106 break;
1107 }
1108
1109 sock_put(sk);
1110
1111 return err;
1112 }
1113
1114 /* Tunnel ioctl helper.
1115 *
1116 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1117 * specifies a session_id, the session ioctl handler is called. This allows an
1118 * application to retrieve session stats via a tunnel socket.
1119 */
1120 static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
1121 unsigned int cmd, unsigned long arg)
1122 {
1123 int err = 0;
1124 struct sock *sk;
1125 struct pppol2tp_ioc_stats stats;
1126
1127 l2tp_dbg(tunnel, PPPOL2TP_MSG_CONTROL,
1128 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1129 tunnel->name, cmd, arg);
1130
1131 sk = tunnel->sock;
1132 sock_hold(sk);
1133
1134 switch (cmd) {
1135 case PPPIOCGL2TPSTATS:
1136 err = -ENXIO;
1137 if (!(sk->sk_state & PPPOX_CONNECTED))
1138 break;
1139
1140 if (copy_from_user(&stats, (void __user *) arg,
1141 sizeof(stats))) {
1142 err = -EFAULT;
1143 break;
1144 }
1145 if (stats.session_id != 0) {
1146 /* resend to session ioctl handler */
1147 struct l2tp_session *session =
1148 l2tp_session_find(sock_net(sk), tunnel, stats.session_id);
1149 if (session != NULL)
1150 err = pppol2tp_session_ioctl(session, cmd, arg);
1151 else
1152 err = -EBADR;
1153 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 }
1163 l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1164 tunnel->name);
1165 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 */
1181 static 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
1226 end_put_sess:
1227 sock_put(sk);
1228 end:
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 */
1244 static 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;
1253 l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: set debug=%x\n",
1254 tunnel->name, tunnel->debug);
1255 break;
1256
1257 default:
1258 err = -ENOPROTOOPT;
1259 break;
1260 }
1261
1262 return err;
1263 }
1264
1265 /* Session setsockopt helper.
1266 */
1267 static 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;
1281 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1282 "%s: set recv_seq=%d\n",
1283 session->name, session->recv_seq);
1284 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 }
1298 l2tp_session_set_header_len(session, session->tunnel->version);
1299 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1300 "%s: set send_seq=%d\n",
1301 session->name, session->send_seq);
1302 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;
1310 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1311 "%s: set lns_mode=%d\n",
1312 session->name, session->lns_mode);
1313 break;
1314
1315 case PPPOL2TP_SO_DEBUG:
1316 session->debug = val;
1317 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set debug=%x\n",
1318 session->name, session->debug);
1319 break;
1320
1321 case PPPOL2TP_SO_REORDERTO:
1322 session->reorder_timeout = msecs_to_jiffies(val);
1323 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1324 "%s: set reorder_timeout=%d\n",
1325 session->name, session->reorder_timeout);
1326 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 */
1341 static 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)
1352 return -EINVAL;
1353
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
1387 end_put_sess:
1388 sock_put(sk);
1389 end:
1390 return err;
1391 }
1392
1393 /* Tunnel getsockopt helper. Called with sock locked.
1394 */
1395 static 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;
1404 l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: get debug=%x\n",
1405 tunnel->name, tunnel->debug);
1406 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 */
1418 static 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;
1427 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1428 "%s: get recv_seq=%d\n", session->name, *val);
1429 break;
1430
1431 case PPPOL2TP_SO_SENDSEQ:
1432 *val = session->send_seq;
1433 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1434 "%s: get send_seq=%d\n", session->name, *val);
1435 break;
1436
1437 case PPPOL2TP_SO_LNSMODE:
1438 *val = session->lns_mode;
1439 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1440 "%s: get lns_mode=%d\n", session->name, *val);
1441 break;
1442
1443 case PPPOL2TP_SO_DEBUG:
1444 *val = session->debug;
1445 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get debug=%d\n",
1446 session->name, *val);
1447 break;
1448
1449 case PPPOL2TP_SO_REORDERTO:
1450 *val = (int) jiffies_to_msecs(session->reorder_timeout);
1451 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1452 "%s: get reorder_timeout=%d\n", session->name, *val);
1453 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 */
1467 static int pppol2tp_getsockopt(struct socket *sock, int level, int optname,
1468 char __user *optval, int __user *optlen)
1469 {
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)
1478 return -EINVAL;
1479
1480 if (get_user(len, optlen))
1481 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;
1513 if (put_user(len, optlen))
1514 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
1521 end_put_sess:
1522 sock_put(sk);
1523 end:
1524 return err;
1525 }
1526
1527 /*****************************************************************************
1528 * /proc filesystem for debug
1529 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1530 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1531 *****************************************************************************/
1532
1533 static unsigned int pppol2tp_net_id;
1534
1535 #ifdef CONFIG_PROC_FS
1536
1537 struct 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
1545 static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
1546 {
1547 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 }
1558 }
1559
1560 static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
1561 {
1562 pd->session = l2tp_session_find_nth(pd->tunnel, pd->session_idx);
1563 pd->session_idx++;
1564
1565 if (pd->session == NULL) {
1566 pd->session_idx = 0;
1567 pppol2tp_next_tunnel(net, pd);
1568 }
1569 }
1570
1571 static 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
1593 out:
1594 return pd;
1595 }
1596
1597 static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
1598 {
1599 (*pos)++;
1600 return NULL;
1601 }
1602
1603 static void pppol2tp_seq_stop(struct seq_file *p, void *v)
1604 {
1605 /* nothing to do */
1606 }
1607
1608 static 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);
1616 seq_printf(m, " %08x %ld/%ld/%ld %ld/%ld/%ld\n",
1617 tunnel->debug,
1618 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));
1624 }
1625
1626 static 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);
1631 struct pppox_sock *po = pppox_sk(ps->sock);
1632 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));
1658 seq_printf(m, " %hu/%hu %ld/%ld/%ld %ld/%ld/%ld\n",
1659 session->nr, session->ns,
1660 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));
1666
1667 if (po)
1668 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
1669 }
1670
1671 static 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 */
1689 if (pd->session == NULL)
1690 pppol2tp_seq_tunnel_show(m, pd->tunnel);
1691 else
1692 pppol2tp_seq_session_show(m, pd->session);
1693
1694 out:
1695 return 0;
1696 }
1697
1698 static const struct seq_operations pppol2tp_seq_ops = {
1699 .start = pppol2tp_seq_start,
1700 .next = pppol2tp_seq_next,
1701 .stop = pppol2tp_seq_stop,
1702 .show = pppol2tp_seq_show,
1703 };
1704
1705 /* Called when our /proc file is opened. We allocate data for use when
1706 * iterating our tunnel / session contexts and store it in the private
1707 * data of the seq_file.
1708 */
1709 static int pppol2tp_proc_open(struct inode *inode, struct file *file)
1710 {
1711 return seq_open_net(inode, file, &pppol2tp_seq_ops,
1712 sizeof(struct pppol2tp_seq_data));
1713 }
1714
1715 static const struct file_operations pppol2tp_proc_fops = {
1716 .owner = THIS_MODULE,
1717 .open = pppol2tp_proc_open,
1718 .read = seq_read,
1719 .llseek = seq_lseek,
1720 .release = seq_release_net,
1721 };
1722
1723 #endif /* CONFIG_PROC_FS */
1724
1725 /*****************************************************************************
1726 * Network namespace
1727 *****************************************************************************/
1728
1729 static __net_init int pppol2tp_init_net(struct net *net)
1730 {
1731 struct proc_dir_entry *pde;
1732 int err = 0;
1733
1734 pde = proc_create("pppol2tp", S_IRUGO, net->proc_net,
1735 &pppol2tp_proc_fops);
1736 if (!pde) {
1737 err = -ENOMEM;
1738 goto out;
1739 }
1740
1741 out:
1742 return err;
1743 }
1744
1745 static __net_exit void pppol2tp_exit_net(struct net *net)
1746 {
1747 remove_proc_entry("pppol2tp", net->proc_net);
1748 }
1749
1750 static struct pernet_operations pppol2tp_net_ops = {
1751 .init = pppol2tp_init_net,
1752 .exit = pppol2tp_exit_net,
1753 .id = &pppol2tp_net_id,
1754 };
1755
1756 /*****************************************************************************
1757 * Init and cleanup
1758 *****************************************************************************/
1759
1760 static const struct proto_ops pppol2tp_ops = {
1761 .family = AF_PPPOX,
1762 .owner = THIS_MODULE,
1763 .release = pppol2tp_release,
1764 .bind = sock_no_bind,
1765 .connect = pppol2tp_connect,
1766 .socketpair = sock_no_socketpair,
1767 .accept = sock_no_accept,
1768 .getname = pppol2tp_getname,
1769 .poll = datagram_poll,
1770 .listen = sock_no_listen,
1771 .shutdown = sock_no_shutdown,
1772 .setsockopt = pppol2tp_setsockopt,
1773 .getsockopt = pppol2tp_getsockopt,
1774 .sendmsg = pppol2tp_sendmsg,
1775 .recvmsg = pppol2tp_recvmsg,
1776 .mmap = sock_no_mmap,
1777 .ioctl = pppox_ioctl,
1778 };
1779
1780 static const struct pppox_proto pppol2tp_proto = {
1781 .create = pppol2tp_create,
1782 .ioctl = pppol2tp_ioctl,
1783 .owner = THIS_MODULE,
1784 };
1785
1786 #ifdef CONFIG_L2TP_V3
1787
1788 static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = {
1789 .session_create = pppol2tp_session_create,
1790 .session_delete = l2tp_session_delete,
1791 };
1792
1793 #endif /* CONFIG_L2TP_V3 */
1794
1795 static int __init pppol2tp_init(void)
1796 {
1797 int err;
1798
1799 err = register_pernet_device(&pppol2tp_net_ops);
1800 if (err)
1801 goto out;
1802
1803 err = proto_register(&pppol2tp_sk_proto, 0);
1804 if (err)
1805 goto out_unregister_pppol2tp_pernet;
1806
1807 err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
1808 if (err)
1809 goto out_unregister_pppol2tp_proto;
1810
1811 #ifdef CONFIG_L2TP_V3
1812 err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops);
1813 if (err)
1814 goto out_unregister_pppox;
1815 #endif
1816
1817 pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION);
1818
1819 out:
1820 return err;
1821
1822 #ifdef CONFIG_L2TP_V3
1823 out_unregister_pppox:
1824 unregister_pppox_proto(PX_PROTO_OL2TP);
1825 #endif
1826 out_unregister_pppol2tp_proto:
1827 proto_unregister(&pppol2tp_sk_proto);
1828 out_unregister_pppol2tp_pernet:
1829 unregister_pernet_device(&pppol2tp_net_ops);
1830 goto out;
1831 }
1832
1833 static void __exit pppol2tp_exit(void)
1834 {
1835 #ifdef CONFIG_L2TP_V3
1836 l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP);
1837 #endif
1838 unregister_pppox_proto(PX_PROTO_OL2TP);
1839 proto_unregister(&pppol2tp_sk_proto);
1840 unregister_pernet_device(&pppol2tp_net_ops);
1841 }
1842
1843 module_init(pppol2tp_init);
1844 module_exit(pppol2tp_exit);
1845
1846 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1847 MODULE_DESCRIPTION("PPP over L2TP over UDP");
1848 MODULE_LICENSE("GPL");
1849 MODULE_VERSION(PPPOL2TP_DRV_VERSION);
1850 MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_OL2TP);
1851 MODULE_ALIAS_L2TP_PWTYPE(11);
Linux with added FPC-III support