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-rw-r--r--net/l2tp/l2tp_ppp.c1837
1 files changed, 1837 insertions, 0 deletions
diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c
new file mode 100644
index 000000000000..90d82b3f2889
--- /dev/null
+++ b/net/l2tp/l2tp_ppp.c
@@ -0,0 +1,1837 @@
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#include <linux/module.h>
61#include <linux/string.h>
62#include <linux/list.h>
63#include <linux/uaccess.h>
64
65#include <linux/kernel.h>
66#include <linux/spinlock.h>
67#include <linux/kthread.h>
68#include <linux/sched.h>
69#include <linux/slab.h>
70#include <linux/errno.h>
71#include <linux/jiffies.h>
72
73#include <linux/netdevice.h>
74#include <linux/net.h>
75#include <linux/inetdevice.h>
76#include <linux/skbuff.h>
77#include <linux/init.h>
78#include <linux/ip.h>
79#include <linux/udp.h>
80#include <linux/if_pppox.h>
81#include <linux/if_pppol2tp.h>
82#include <net/sock.h>
83#include <linux/ppp_channel.h>
84#include <linux/ppp_defs.h>
85#include <linux/if_ppp.h>
86#include <linux/file.h>
87#include <linux/hash.h>
88#include <linux/sort.h>
89#include <linux/proc_fs.h>
90#include <linux/l2tp.h>
91#include <linux/nsproxy.h>
92#include <net/net_namespace.h>
93#include <net/netns/generic.h>
94#include <net/dst.h>
95#include <net/ip.h>
96#include <net/udp.h>
97#include <net/xfrm.h>
98
99#include <asm/byteorder.h>
100#include <asm/atomic.h>
101
102#include "l2tp_core.h"
103
104#define PPPOL2TP_DRV_VERSION "V2.0"
105
106/* Space for UDP, L2TP and PPP headers */
107#define PPPOL2TP_HEADER_OVERHEAD 40
108
109#define PRINTK(_mask, _type, _lvl, _fmt, args...) \
110 do { \
111 if ((_mask) & (_type)) \
112 printk(_lvl "PPPOL2TP: " _fmt, ##args); \
113 } while (0)
114
115/* Number of bytes to build transmit L2TP headers.
116 * Unfortunately the size is different depending on whether sequence numbers
117 * are enabled.
118 */
119#define PPPOL2TP_L2TP_HDR_SIZE_SEQ 10
120#define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ 6
121
122/* Private data of each session. This data lives at the end of struct
123 * l2tp_session, referenced via session->priv[].
124 */
125struct pppol2tp_session {
126 int owner; /* pid that opened the socket */
127
128 struct sock *sock; /* Pointer to the session
129 * PPPoX socket */
130 struct sock *tunnel_sock; /* Pointer to the tunnel UDP
131 * socket */
132 int flags; /* accessed by PPPIOCGFLAGS.
133 * Unused. */
134};
135
136static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb);
137
138static struct ppp_channel_ops pppol2tp_chan_ops = { pppol2tp_xmit , NULL };
139static const struct proto_ops pppol2tp_ops;
140
141/* Helpers to obtain tunnel/session contexts from sockets.
142 */
143static inline struct l2tp_session *pppol2tp_sock_to_session(struct sock *sk)
144{
145 struct l2tp_session *session;
146
147 if (sk == NULL)
148 return NULL;
149
150 sock_hold(sk);
151 session = (struct l2tp_session *)(sk->sk_user_data);
152 if (session == NULL) {
153 sock_put(sk);
154 goto out;
155 }
156
157 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
158
159out:
160 return session;
161}
162
163/*****************************************************************************
164 * Receive data handling
165 *****************************************************************************/
166
167static 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 */
188static int pppol2tp_recvmsg(struct kiocb *iocb, struct socket *sock,
189 struct msghdr *msg, size_t len,
190 int flags)
191{
192 int err;
193 struct sk_buff *skb;
194 struct sock *sk = sock->sk;
195
196 err = -EIO;
197 if (sk->sk_state & PPPOX_BOUND)
198 goto end;
199
200 msg->msg_namelen = 0;
201
202 err = 0;
203 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
204 flags & MSG_DONTWAIT, &err);
205 if (!skb)
206 goto end;
207
208 if (len > skb->len)
209 len = skb->len;
210 else if (len < skb->len)
211 msg->msg_flags |= MSG_TRUNC;
212
213 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len);
214 if (likely(err == 0))
215 err = len;
216
217 kfree_skb(skb);
218end:
219 return err;
220}
221
222static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
223{
224 struct pppol2tp_session *ps = l2tp_session_priv(session);
225 struct sock *sk = NULL;
226
227 /* If the socket is bound, send it in to PPP's input queue. Otherwise
228 * queue it on the session socket.
229 */
230 sk = ps->sock;
231 if (sk == NULL)
232 goto no_sock;
233
234 if (sk->sk_state & PPPOX_BOUND) {
235 struct pppox_sock *po;
236 PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG,
237 "%s: recv %d byte data frame, passing to ppp\n",
238 session->name, data_len);
239
240 /* We need to forget all info related to the L2TP packet
241 * gathered in the skb as we are going to reuse the same
242 * skb for the inner packet.
243 * Namely we need to:
244 * - reset xfrm (IPSec) information as it applies to
245 * the outer L2TP packet and not to the inner one
246 * - release the dst to force a route lookup on the inner
247 * IP packet since skb->dst currently points to the dst
248 * of the UDP tunnel
249 * - reset netfilter information as it doesn't apply
250 * to the inner packet either
251 */
252 secpath_reset(skb);
253 skb_dst_drop(skb);
254 nf_reset(skb);
255
256 po = pppox_sk(sk);
257 ppp_input(&po->chan, skb);
258 } else {
259 PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_INFO,
260 "%s: socket not bound\n", session->name);
261
262 /* Not bound. Nothing we can do, so discard. */
263 session->stats.rx_errors++;
264 kfree_skb(skb);
265 }
266
267 return;
268
269no_sock:
270 PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_INFO,
271 "%s: no socket\n", session->name);
272 kfree_skb(skb);
273}
274
275static void pppol2tp_session_sock_hold(struct l2tp_session *session)
276{
277 struct pppol2tp_session *ps = l2tp_session_priv(session);
278
279 if (ps->sock)
280 sock_hold(ps->sock);
281}
282
283static void pppol2tp_session_sock_put(struct l2tp_session *session)
284{
285 struct pppol2tp_session *ps = l2tp_session_priv(session);
286
287 if (ps->sock)
288 sock_put(ps->sock);
289}
290
291/************************************************************************
292 * Transmit handling
293 ***********************************************************************/
294
295/* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here
296 * when a user application does a sendmsg() on the session socket. L2TP and
297 * PPP headers must be inserted into the user's data.
298 */
299static int pppol2tp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
300 size_t total_len)
301{
302 static const unsigned char ppph[2] = { 0xff, 0x03 };
303 struct sock *sk = sock->sk;
304 struct sk_buff *skb;
305 int error;
306 struct l2tp_session *session;
307 struct l2tp_tunnel *tunnel;
308 struct pppol2tp_session *ps;
309 int uhlen;
310
311 error = -ENOTCONN;
312 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
313 goto error;
314
315 /* Get session and tunnel contexts */
316 error = -EBADF;
317 session = pppol2tp_sock_to_session(sk);
318 if (session == NULL)
319 goto error;
320
321 ps = l2tp_session_priv(session);
322 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
323 if (tunnel == NULL)
324 goto error_put_sess;
325
326 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
327
328 /* Allocate a socket buffer */
329 error = -ENOMEM;
330 skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) +
331 uhlen + session->hdr_len +
332 sizeof(ppph) + total_len,
333 0, GFP_KERNEL);
334 if (!skb)
335 goto error_put_sess_tun;
336
337 /* Reserve space for headers. */
338 skb_reserve(skb, NET_SKB_PAD);
339 skb_reset_network_header(skb);
340 skb_reserve(skb, sizeof(struct iphdr));
341 skb_reset_transport_header(skb);
342 skb_reserve(skb, uhlen);
343
344 /* Add PPP header */
345 skb->data[0] = ppph[0];
346 skb->data[1] = ppph[1];
347 skb_put(skb, 2);
348
349 /* Copy user data into skb */
350 error = memcpy_fromiovec(skb->data, m->msg_iov, total_len);
351 if (error < 0) {
352 kfree_skb(skb);
353 goto error_put_sess_tun;
354 }
355 skb_put(skb, total_len);
356
357 l2tp_xmit_skb(session, skb, session->hdr_len);
358
359 sock_put(ps->tunnel_sock);
360
361 return error;
362
363error_put_sess_tun:
364 sock_put(ps->tunnel_sock);
365error_put_sess:
366 sock_put(sk);
367error:
368 return error;
369}
370
371/* Transmit function called by generic PPP driver. Sends PPP frame
372 * over PPPoL2TP socket.
373 *
374 * This is almost the same as pppol2tp_sendmsg(), but rather than
375 * being called with a msghdr from userspace, it is called with a skb
376 * from the kernel.
377 *
378 * The supplied skb from ppp doesn't have enough headroom for the
379 * insertion of L2TP, UDP and IP headers so we need to allocate more
380 * headroom in the skb. This will create a cloned skb. But we must be
381 * careful in the error case because the caller will expect to free
382 * the skb it supplied, not our cloned skb. So we take care to always
383 * leave the original skb unfreed if we return an error.
384 */
385static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
386{
387 static const u8 ppph[2] = { 0xff, 0x03 };
388 struct sock *sk = (struct sock *) chan->private;
389 struct sock *sk_tun;
390 struct l2tp_session *session;
391 struct l2tp_tunnel *tunnel;
392 struct pppol2tp_session *ps;
393 int old_headroom;
394 int new_headroom;
395
396 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
397 goto abort;
398
399 /* Get session and tunnel contexts from the socket */
400 session = pppol2tp_sock_to_session(sk);
401 if (session == NULL)
402 goto abort;
403
404 ps = l2tp_session_priv(session);
405 sk_tun = ps->tunnel_sock;
406 if (sk_tun == NULL)
407 goto abort_put_sess;
408 tunnel = l2tp_sock_to_tunnel(sk_tun);
409 if (tunnel == NULL)
410 goto abort_put_sess;
411
412 old_headroom = skb_headroom(skb);
413 if (skb_cow_head(skb, sizeof(ppph)))
414 goto abort_put_sess_tun;
415
416 new_headroom = skb_headroom(skb);
417 skb->truesize += new_headroom - old_headroom;
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
430abort_put_sess_tun:
431 sock_put(sk_tun);
432abort_put_sess:
433 sock_put(sk);
434abort:
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 */
446static 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
477out:
478 return;
479}
480
481/* Really kill the session socket. (Called from sock_put() if
482 * refcnt == 0.)
483 */
484static 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
498out:
499 return;
500}
501
502/* Called when the PPPoX socket (session) is closed.
503 */
504static 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
549error:
550 release_sock(sk);
551 return error;
552}
553
554static struct proto pppol2tp_sk_proto = {
555 .name = "PPPOL2TP",
556 .owner = THIS_MODULE,
557 .obj_size = sizeof(struct pppox_sock),
558};
559
560static 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 */
573static 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
596out:
597 return error;
598}
599
600#if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
601static 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 */
616static 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 sockaddr_pppol2tpv3 *sp3 = (struct sockaddr_pppol2tpv3 *) uservaddr;
622 struct pppox_sock *po = pppox_sk(sk);
623 struct l2tp_session *session = NULL;
624 struct l2tp_tunnel *tunnel;
625 struct pppol2tp_session *ps;
626 struct dst_entry *dst;
627 struct l2tp_session_cfg cfg = { 0, };
628 int error = 0;
629 u32 tunnel_id, peer_tunnel_id;
630 u32 session_id, peer_session_id;
631 int ver = 2;
632 int fd;
633
634 lock_sock(sk);
635
636 error = -EINVAL;
637 if (sp->sa_protocol != PX_PROTO_OL2TP)
638 goto end;
639
640 /* Check for already bound sockets */
641 error = -EBUSY;
642 if (sk->sk_state & PPPOX_CONNECTED)
643 goto end;
644
645 /* We don't supporting rebinding anyway */
646 error = -EALREADY;
647 if (sk->sk_user_data)
648 goto end; /* socket is already attached */
649
650 /* Get params from socket address. Handle L2TPv2 and L2TPv3 */
651 if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) {
652 fd = sp->pppol2tp.fd;
653 tunnel_id = sp->pppol2tp.s_tunnel;
654 peer_tunnel_id = sp->pppol2tp.d_tunnel;
655 session_id = sp->pppol2tp.s_session;
656 peer_session_id = sp->pppol2tp.d_session;
657 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) {
658 ver = 3;
659 fd = sp3->pppol2tp.fd;
660 tunnel_id = sp3->pppol2tp.s_tunnel;
661 peer_tunnel_id = sp3->pppol2tp.d_tunnel;
662 session_id = sp3->pppol2tp.s_session;
663 peer_session_id = sp3->pppol2tp.d_session;
664 } else {
665 error = -EINVAL;
666 goto end; /* bad socket address */
667 }
668
669 /* Don't bind if tunnel_id is 0 */
670 error = -EINVAL;
671 if (tunnel_id == 0)
672 goto end;
673
674 tunnel = l2tp_tunnel_find(sock_net(sk), tunnel_id);
675
676 /* Special case: create tunnel context if session_id and
677 * peer_session_id is 0. Otherwise look up tunnel using supplied
678 * tunnel id.
679 */
680 if ((session_id == 0) && (peer_session_id == 0)) {
681 if (tunnel == NULL) {
682 struct l2tp_tunnel_cfg tcfg = {
683 .encap = L2TP_ENCAPTYPE_UDP,
684 .debug = 0,
685 };
686 error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel);
687 if (error < 0)
688 goto end;
689 }
690 } else {
691 /* Error if we can't find the tunnel */
692 error = -ENOENT;
693 if (tunnel == NULL)
694 goto end;
695
696 /* Error if socket is not prepped */
697 if (tunnel->sock == NULL)
698 goto end;
699 }
700
701 if (tunnel->recv_payload_hook == NULL)
702 tunnel->recv_payload_hook = pppol2tp_recv_payload_hook;
703
704 if (tunnel->peer_tunnel_id == 0) {
705 if (ver == 2)
706 tunnel->peer_tunnel_id = sp->pppol2tp.d_tunnel;
707 else
708 tunnel->peer_tunnel_id = sp3->pppol2tp.d_tunnel;
709 }
710
711 /* Create session if it doesn't already exist. We handle the
712 * case where a session was previously created by the netlink
713 * interface by checking that the session doesn't already have
714 * a socket and its tunnel socket are what we expect. If any
715 * of those checks fail, return EEXIST to the caller.
716 */
717 session = l2tp_session_find(sock_net(sk), tunnel, session_id);
718 if (session == NULL) {
719 /* Default MTU must allow space for UDP/L2TP/PPP
720 * headers.
721 */
722 cfg.mtu = cfg.mru = 1500 - PPPOL2TP_HEADER_OVERHEAD;
723
724 /* Allocate and initialize a new session context. */
725 session = l2tp_session_create(sizeof(struct pppol2tp_session),
726 tunnel, session_id,
727 peer_session_id, &cfg);
728 if (session == NULL) {
729 error = -ENOMEM;
730 goto end;
731 }
732 } else {
733 ps = l2tp_session_priv(session);
734 error = -EEXIST;
735 if (ps->sock != NULL)
736 goto end;
737
738 /* consistency checks */
739 if (ps->tunnel_sock != tunnel->sock)
740 goto end;
741 }
742
743 /* Associate session with its PPPoL2TP socket */
744 ps = l2tp_session_priv(session);
745 ps->owner = current->pid;
746 ps->sock = sk;
747 ps->tunnel_sock = tunnel->sock;
748
749 session->recv_skb = pppol2tp_recv;
750 session->session_close = pppol2tp_session_close;
751#if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
752 session->show = pppol2tp_show;
753#endif
754
755 /* We need to know each time a skb is dropped from the reorder
756 * queue.
757 */
758 session->ref = pppol2tp_session_sock_hold;
759 session->deref = pppol2tp_session_sock_put;
760
761 /* If PMTU discovery was enabled, use the MTU that was discovered */
762 dst = sk_dst_get(sk);
763 if (dst != NULL) {
764 u32 pmtu = dst_mtu(__sk_dst_get(sk));
765 if (pmtu != 0)
766 session->mtu = session->mru = pmtu -
767 PPPOL2TP_HEADER_OVERHEAD;
768 dst_release(dst);
769 }
770
771 /* Special case: if source & dest session_id == 0x0000, this
772 * socket is being created to manage the tunnel. Just set up
773 * the internal context for use by ioctl() and sockopt()
774 * handlers.
775 */
776 if ((session->session_id == 0) &&
777 (session->peer_session_id == 0)) {
778 error = 0;
779 goto out_no_ppp;
780 }
781
782 /* The only header we need to worry about is the L2TP
783 * header. This size is different depending on whether
784 * sequence numbers are enabled for the data channel.
785 */
786 po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
787
788 po->chan.private = sk;
789 po->chan.ops = &pppol2tp_chan_ops;
790 po->chan.mtu = session->mtu;
791
792 error = ppp_register_net_channel(sock_net(sk), &po->chan);
793 if (error)
794 goto end;
795
796out_no_ppp:
797 /* This is how we get the session context from the socket. */
798 sk->sk_user_data = session;
799 sk->sk_state = PPPOX_CONNECTED;
800 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
801 "%s: created\n", session->name);
802
803end:
804 release_sock(sk);
805
806 return error;
807}
808
809#ifdef CONFIG_L2TP_V3
810
811/* Called when creating sessions via the netlink interface.
812 */
813static int pppol2tp_session_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg)
814{
815 int error;
816 struct l2tp_tunnel *tunnel;
817 struct l2tp_session *session;
818 struct pppol2tp_session *ps;
819
820 tunnel = l2tp_tunnel_find(net, tunnel_id);
821
822 /* Error if we can't find the tunnel */
823 error = -ENOENT;
824 if (tunnel == NULL)
825 goto out;
826
827 /* Error if tunnel socket is not prepped */
828 if (tunnel->sock == NULL)
829 goto out;
830
831 /* Check that this session doesn't already exist */
832 error = -EEXIST;
833 session = l2tp_session_find(net, tunnel, session_id);
834 if (session != NULL)
835 goto out;
836
837 /* Default MTU values. */
838 if (cfg->mtu == 0)
839 cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
840 if (cfg->mru == 0)
841 cfg->mru = cfg->mtu;
842
843 /* Allocate and initialize a new session context. */
844 error = -ENOMEM;
845 session = l2tp_session_create(sizeof(struct pppol2tp_session),
846 tunnel, session_id,
847 peer_session_id, cfg);
848 if (session == NULL)
849 goto out;
850
851 ps = l2tp_session_priv(session);
852 ps->tunnel_sock = tunnel->sock;
853
854 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
855 "%s: created\n", session->name);
856
857 error = 0;
858
859out:
860 return error;
861}
862
863/* Called when deleting sessions via the netlink interface.
864 */
865static int pppol2tp_session_delete(struct l2tp_session *session)
866{
867 struct pppol2tp_session *ps = l2tp_session_priv(session);
868
869 if (ps->sock == NULL)
870 l2tp_session_dec_refcount(session);
871
872 return 0;
873}
874
875#endif /* CONFIG_L2TP_V3 */
876
877/* getname() support.
878 */
879static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
880 int *usockaddr_len, int peer)
881{
882 int len = 0;
883 int error = 0;
884 struct l2tp_session *session;
885 struct l2tp_tunnel *tunnel;
886 struct sock *sk = sock->sk;
887 struct inet_sock *inet;
888 struct pppol2tp_session *pls;
889
890 error = -ENOTCONN;
891 if (sk == NULL)
892 goto end;
893 if (sk->sk_state != PPPOX_CONNECTED)
894 goto end;
895
896 error = -EBADF;
897 session = pppol2tp_sock_to_session(sk);
898 if (session == NULL)
899 goto end;
900
901 pls = l2tp_session_priv(session);
902 tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock);
903 if (tunnel == NULL) {
904 error = -EBADF;
905 goto end_put_sess;
906 }
907
908 inet = inet_sk(sk);
909 if (tunnel->version == 2) {
910 struct sockaddr_pppol2tp sp;
911 len = sizeof(sp);
912 memset(&sp, 0, len);
913 sp.sa_family = AF_PPPOX;
914 sp.sa_protocol = PX_PROTO_OL2TP;
915 sp.pppol2tp.fd = tunnel->fd;
916 sp.pppol2tp.pid = pls->owner;
917 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
918 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
919 sp.pppol2tp.s_session = session->session_id;
920 sp.pppol2tp.d_session = session->peer_session_id;
921 sp.pppol2tp.addr.sin_family = AF_INET;
922 sp.pppol2tp.addr.sin_port = inet->inet_dport;
923 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
924 memcpy(uaddr, &sp, len);
925 } else if (tunnel->version == 3) {
926 struct sockaddr_pppol2tpv3 sp;
927 len = sizeof(sp);
928 memset(&sp, 0, len);
929 sp.sa_family = AF_PPPOX;
930 sp.sa_protocol = PX_PROTO_OL2TP;
931 sp.pppol2tp.fd = tunnel->fd;
932 sp.pppol2tp.pid = pls->owner;
933 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
934 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
935 sp.pppol2tp.s_session = session->session_id;
936 sp.pppol2tp.d_session = session->peer_session_id;
937 sp.pppol2tp.addr.sin_family = AF_INET;
938 sp.pppol2tp.addr.sin_port = inet->inet_dport;
939 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
940 memcpy(uaddr, &sp, len);
941 }
942
943 *usockaddr_len = len;
944
945 sock_put(pls->tunnel_sock);
946end_put_sess:
947 sock_put(sk);
948 error = 0;
949
950end:
951 return error;
952}
953
954/****************************************************************************
955 * ioctl() handlers.
956 *
957 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
958 * sockets. However, in order to control kernel tunnel features, we allow
959 * userspace to create a special "tunnel" PPPoX socket which is used for
960 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
961 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
962 * calls.
963 ****************************************************************************/
964
965static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest,
966 struct l2tp_stats *stats)
967{
968 dest->tx_packets = stats->tx_packets;
969 dest->tx_bytes = stats->tx_bytes;
970 dest->tx_errors = stats->tx_errors;
971 dest->rx_packets = stats->rx_packets;
972 dest->rx_bytes = stats->rx_bytes;
973 dest->rx_seq_discards = stats->rx_seq_discards;
974 dest->rx_oos_packets = stats->rx_oos_packets;
975 dest->rx_errors = stats->rx_errors;
976}
977
978/* Session ioctl helper.
979 */
980static int pppol2tp_session_ioctl(struct l2tp_session *session,
981 unsigned int cmd, unsigned long arg)
982{
983 struct ifreq ifr;
984 int err = 0;
985 struct sock *sk;
986 int val = (int) arg;
987 struct pppol2tp_session *ps = l2tp_session_priv(session);
988 struct l2tp_tunnel *tunnel = session->tunnel;
989 struct pppol2tp_ioc_stats stats;
990
991 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG,
992 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
993 session->name, cmd, arg);
994
995 sk = ps->sock;
996 sock_hold(sk);
997
998 switch (cmd) {
999 case SIOCGIFMTU:
1000 err = -ENXIO;
1001 if (!(sk->sk_state & PPPOX_CONNECTED))
1002 break;
1003
1004 err = -EFAULT;
1005 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1006 break;
1007 ifr.ifr_mtu = session->mtu;
1008 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
1009 break;
1010
1011 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1012 "%s: get mtu=%d\n", session->name, session->mtu);
1013 err = 0;
1014 break;
1015
1016 case SIOCSIFMTU:
1017 err = -ENXIO;
1018 if (!(sk->sk_state & PPPOX_CONNECTED))
1019 break;
1020
1021 err = -EFAULT;
1022 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1023 break;
1024
1025 session->mtu = ifr.ifr_mtu;
1026
1027 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1028 "%s: set mtu=%d\n", session->name, session->mtu);
1029 err = 0;
1030 break;
1031
1032 case PPPIOCGMRU:
1033 err = -ENXIO;
1034 if (!(sk->sk_state & PPPOX_CONNECTED))
1035 break;
1036
1037 err = -EFAULT;
1038 if (put_user(session->mru, (int __user *) arg))
1039 break;
1040
1041 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1042 "%s: get mru=%d\n", session->name, session->mru);
1043 err = 0;
1044 break;
1045
1046 case PPPIOCSMRU:
1047 err = -ENXIO;
1048 if (!(sk->sk_state & PPPOX_CONNECTED))
1049 break;
1050
1051 err = -EFAULT;
1052 if (get_user(val, (int __user *) arg))
1053 break;
1054
1055 session->mru = val;
1056 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1057 "%s: set mru=%d\n", session->name, session->mru);
1058 err = 0;
1059 break;
1060
1061 case PPPIOCGFLAGS:
1062 err = -EFAULT;
1063 if (put_user(ps->flags, (int __user *) arg))
1064 break;
1065
1066 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1067 "%s: get flags=%d\n", session->name, ps->flags);
1068 err = 0;
1069 break;
1070
1071 case PPPIOCSFLAGS:
1072 err = -EFAULT;
1073 if (get_user(val, (int __user *) arg))
1074 break;
1075 ps->flags = val;
1076 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1077 "%s: set flags=%d\n", session->name, ps->flags);
1078 err = 0;
1079 break;
1080
1081 case PPPIOCGL2TPSTATS:
1082 err = -ENXIO;
1083 if (!(sk->sk_state & PPPOX_CONNECTED))
1084 break;
1085
1086 memset(&stats, 0, sizeof(stats));
1087 stats.tunnel_id = tunnel->tunnel_id;
1088 stats.session_id = session->session_id;
1089 pppol2tp_copy_stats(&stats, &session->stats);
1090 if (copy_to_user((void __user *) arg, &stats,
1091 sizeof(stats)))
1092 break;
1093 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1094 "%s: get L2TP stats\n", session->name);
1095 err = 0;
1096 break;
1097
1098 default:
1099 err = -ENOSYS;
1100 break;
1101 }
1102
1103 sock_put(sk);
1104
1105 return err;
1106}
1107
1108/* Tunnel ioctl helper.
1109 *
1110 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1111 * specifies a session_id, the session ioctl handler is called. This allows an
1112 * application to retrieve session stats via a tunnel socket.
1113 */
1114static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
1115 unsigned int cmd, unsigned long arg)
1116{
1117 int err = 0;
1118 struct sock *sk;
1119 struct pppol2tp_ioc_stats stats;
1120
1121 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG,
1122 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1123 tunnel->name, cmd, arg);
1124
1125 sk = tunnel->sock;
1126 sock_hold(sk);
1127
1128 switch (cmd) {
1129 case PPPIOCGL2TPSTATS:
1130 err = -ENXIO;
1131 if (!(sk->sk_state & PPPOX_CONNECTED))
1132 break;
1133
1134 if (copy_from_user(&stats, (void __user *) arg,
1135 sizeof(stats))) {
1136 err = -EFAULT;
1137 break;
1138 }
1139 if (stats.session_id != 0) {
1140 /* resend to session ioctl handler */
1141 struct l2tp_session *session =
1142 l2tp_session_find(sock_net(sk), tunnel, stats.session_id);
1143 if (session != NULL)
1144 err = pppol2tp_session_ioctl(session, cmd, arg);
1145 else
1146 err = -EBADR;
1147 break;
1148 }
1149#ifdef CONFIG_XFRM
1150 stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
1151#endif
1152 pppol2tp_copy_stats(&stats, &tunnel->stats);
1153 if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) {
1154 err = -EFAULT;
1155 break;
1156 }
1157 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1158 "%s: get L2TP stats\n", tunnel->name);
1159 err = 0;
1160 break;
1161
1162 default:
1163 err = -ENOSYS;
1164 break;
1165 }
1166
1167 sock_put(sk);
1168
1169 return err;
1170}
1171
1172/* Main ioctl() handler.
1173 * Dispatch to tunnel or session helpers depending on the socket.
1174 */
1175static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
1176 unsigned long arg)
1177{
1178 struct sock *sk = sock->sk;
1179 struct l2tp_session *session;
1180 struct l2tp_tunnel *tunnel;
1181 struct pppol2tp_session *ps;
1182 int err;
1183
1184 if (!sk)
1185 return 0;
1186
1187 err = -EBADF;
1188 if (sock_flag(sk, SOCK_DEAD) != 0)
1189 goto end;
1190
1191 err = -ENOTCONN;
1192 if ((sk->sk_user_data == NULL) ||
1193 (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
1194 goto end;
1195
1196 /* Get session context from the socket */
1197 err = -EBADF;
1198 session = pppol2tp_sock_to_session(sk);
1199 if (session == NULL)
1200 goto end;
1201
1202 /* Special case: if session's session_id is zero, treat ioctl as a
1203 * tunnel ioctl
1204 */
1205 ps = l2tp_session_priv(session);
1206 if ((session->session_id == 0) &&
1207 (session->peer_session_id == 0)) {
1208 err = -EBADF;
1209 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1210 if (tunnel == NULL)
1211 goto end_put_sess;
1212
1213 err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
1214 sock_put(ps->tunnel_sock);
1215 goto end_put_sess;
1216 }
1217
1218 err = pppol2tp_session_ioctl(session, cmd, arg);
1219
1220end_put_sess:
1221 sock_put(sk);
1222end:
1223 return err;
1224}
1225
1226/*****************************************************************************
1227 * setsockopt() / getsockopt() support.
1228 *
1229 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1230 * sockets. In order to control kernel tunnel features, we allow userspace to
1231 * create a special "tunnel" PPPoX socket which is used for control only.
1232 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1233 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1234 *****************************************************************************/
1235
1236/* Tunnel setsockopt() helper.
1237 */
1238static int pppol2tp_tunnel_setsockopt(struct sock *sk,
1239 struct l2tp_tunnel *tunnel,
1240 int optname, int val)
1241{
1242 int err = 0;
1243
1244 switch (optname) {
1245 case PPPOL2TP_SO_DEBUG:
1246 tunnel->debug = val;
1247 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1248 "%s: set debug=%x\n", tunnel->name, tunnel->debug);
1249 break;
1250
1251 default:
1252 err = -ENOPROTOOPT;
1253 break;
1254 }
1255
1256 return err;
1257}
1258
1259/* Session setsockopt helper.
1260 */
1261static int pppol2tp_session_setsockopt(struct sock *sk,
1262 struct l2tp_session *session,
1263 int optname, int val)
1264{
1265 int err = 0;
1266 struct pppol2tp_session *ps = l2tp_session_priv(session);
1267
1268 switch (optname) {
1269 case PPPOL2TP_SO_RECVSEQ:
1270 if ((val != 0) && (val != 1)) {
1271 err = -EINVAL;
1272 break;
1273 }
1274 session->recv_seq = val ? -1 : 0;
1275 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1276 "%s: set recv_seq=%d\n", session->name, session->recv_seq);
1277 break;
1278
1279 case PPPOL2TP_SO_SENDSEQ:
1280 if ((val != 0) && (val != 1)) {
1281 err = -EINVAL;
1282 break;
1283 }
1284 session->send_seq = val ? -1 : 0;
1285 {
1286 struct sock *ssk = ps->sock;
1287 struct pppox_sock *po = pppox_sk(ssk);
1288 po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
1289 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1290 }
1291 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1292 "%s: set send_seq=%d\n", session->name, session->send_seq);
1293 break;
1294
1295 case PPPOL2TP_SO_LNSMODE:
1296 if ((val != 0) && (val != 1)) {
1297 err = -EINVAL;
1298 break;
1299 }
1300 session->lns_mode = val ? -1 : 0;
1301 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1302 "%s: set lns_mode=%d\n", session->name, session->lns_mode);
1303 break;
1304
1305 case PPPOL2TP_SO_DEBUG:
1306 session->debug = val;
1307 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1308 "%s: set debug=%x\n", session->name, session->debug);
1309 break;
1310
1311 case PPPOL2TP_SO_REORDERTO:
1312 session->reorder_timeout = msecs_to_jiffies(val);
1313 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1314 "%s: set reorder_timeout=%d\n", session->name, session->reorder_timeout);
1315 break;
1316
1317 default:
1318 err = -ENOPROTOOPT;
1319 break;
1320 }
1321
1322 return err;
1323}
1324
1325/* Main setsockopt() entry point.
1326 * Does API checks, then calls either the tunnel or session setsockopt
1327 * handler, according to whether the PPPoL2TP socket is a for a regular
1328 * session or the special tunnel type.
1329 */
1330static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
1331 char __user *optval, unsigned int optlen)
1332{
1333 struct sock *sk = sock->sk;
1334 struct l2tp_session *session;
1335 struct l2tp_tunnel *tunnel;
1336 struct pppol2tp_session *ps;
1337 int val;
1338 int err;
1339
1340 if (level != SOL_PPPOL2TP)
1341 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
1342
1343 if (optlen < sizeof(int))
1344 return -EINVAL;
1345
1346 if (get_user(val, (int __user *)optval))
1347 return -EFAULT;
1348
1349 err = -ENOTCONN;
1350 if (sk->sk_user_data == NULL)
1351 goto end;
1352
1353 /* Get session context from the socket */
1354 err = -EBADF;
1355 session = pppol2tp_sock_to_session(sk);
1356 if (session == NULL)
1357 goto end;
1358
1359 /* Special case: if session_id == 0x0000, treat as operation on tunnel
1360 */
1361 ps = l2tp_session_priv(session);
1362 if ((session->session_id == 0) &&
1363 (session->peer_session_id == 0)) {
1364 err = -EBADF;
1365 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1366 if (tunnel == NULL)
1367 goto end_put_sess;
1368
1369 err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
1370 sock_put(ps->tunnel_sock);
1371 } else
1372 err = pppol2tp_session_setsockopt(sk, session, optname, val);
1373
1374 err = 0;
1375
1376end_put_sess:
1377 sock_put(sk);
1378end:
1379 return err;
1380}
1381
1382/* Tunnel getsockopt helper. Called with sock locked.
1383 */
1384static int pppol2tp_tunnel_getsockopt(struct sock *sk,
1385 struct l2tp_tunnel *tunnel,
1386 int optname, int *val)
1387{
1388 int err = 0;
1389
1390 switch (optname) {
1391 case PPPOL2TP_SO_DEBUG:
1392 *val = tunnel->debug;
1393 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1394 "%s: get debug=%x\n", tunnel->name, tunnel->debug);
1395 break;
1396
1397 default:
1398 err = -ENOPROTOOPT;
1399 break;
1400 }
1401
1402 return err;
1403}
1404
1405/* Session getsockopt helper. Called with sock locked.
1406 */
1407static int pppol2tp_session_getsockopt(struct sock *sk,
1408 struct l2tp_session *session,
1409 int optname, int *val)
1410{
1411 int err = 0;
1412
1413 switch (optname) {
1414 case PPPOL2TP_SO_RECVSEQ:
1415 *val = session->recv_seq;
1416 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1417 "%s: get recv_seq=%d\n", session->name, *val);
1418 break;
1419
1420 case PPPOL2TP_SO_SENDSEQ:
1421 *val = session->send_seq;
1422 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1423 "%s: get send_seq=%d\n", session->name, *val);
1424 break;
1425
1426 case PPPOL2TP_SO_LNSMODE:
1427 *val = session->lns_mode;
1428 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1429 "%s: get lns_mode=%d\n", session->name, *val);
1430 break;
1431
1432 case PPPOL2TP_SO_DEBUG:
1433 *val = session->debug;
1434 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1435 "%s: get debug=%d\n", session->name, *val);
1436 break;
1437
1438 case PPPOL2TP_SO_REORDERTO:
1439 *val = (int) jiffies_to_msecs(session->reorder_timeout);
1440 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1441 "%s: get reorder_timeout=%d\n", session->name, *val);
1442 break;
1443
1444 default:
1445 err = -ENOPROTOOPT;
1446 }
1447
1448 return err;
1449}
1450
1451/* Main getsockopt() entry point.
1452 * Does API checks, then calls either the tunnel or session getsockopt
1453 * handler, according to whether the PPPoX socket is a for a regular session
1454 * or the special tunnel type.
1455 */
1456static int pppol2tp_getsockopt(struct socket *sock, int level,
1457 int optname, char __user *optval, int __user *optlen)
1458{
1459 struct sock *sk = sock->sk;
1460 struct l2tp_session *session;
1461 struct l2tp_tunnel *tunnel;
1462 int val, len;
1463 int err;
1464 struct pppol2tp_session *ps;
1465
1466 if (level != SOL_PPPOL2TP)
1467 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1468
1469 if (get_user(len, (int __user *) optlen))
1470 return -EFAULT;
1471
1472 len = min_t(unsigned int, len, sizeof(int));
1473
1474 if (len < 0)
1475 return -EINVAL;
1476
1477 err = -ENOTCONN;
1478 if (sk->sk_user_data == NULL)
1479 goto end;
1480
1481 /* Get the session context */
1482 err = -EBADF;
1483 session = pppol2tp_sock_to_session(sk);
1484 if (session == NULL)
1485 goto end;
1486
1487 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1488 ps = l2tp_session_priv(session);
1489 if ((session->session_id == 0) &&
1490 (session->peer_session_id == 0)) {
1491 err = -EBADF;
1492 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1493 if (tunnel == NULL)
1494 goto end_put_sess;
1495
1496 err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
1497 sock_put(ps->tunnel_sock);
1498 } else
1499 err = pppol2tp_session_getsockopt(sk, session, optname, &val);
1500
1501 err = -EFAULT;
1502 if (put_user(len, (int __user *) optlen))
1503 goto end_put_sess;
1504
1505 if (copy_to_user((void __user *) optval, &val, len))
1506 goto end_put_sess;
1507
1508 err = 0;
1509
1510end_put_sess:
1511 sock_put(sk);
1512end:
1513 return err;
1514}
1515
1516/*****************************************************************************
1517 * /proc filesystem for debug
1518 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1519 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1520 *****************************************************************************/
1521
1522static unsigned int pppol2tp_net_id;
1523
1524#ifdef CONFIG_PROC_FS
1525
1526struct pppol2tp_seq_data {
1527 struct seq_net_private p;
1528 int tunnel_idx; /* current tunnel */
1529 int session_idx; /* index of session within current tunnel */
1530 struct l2tp_tunnel *tunnel;
1531 struct l2tp_session *session; /* NULL means get next tunnel */
1532};
1533
1534static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
1535{
1536 for (;;) {
1537 pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx);
1538 pd->tunnel_idx++;
1539
1540 if (pd->tunnel == NULL)
1541 break;
1542
1543 /* Ignore L2TPv3 tunnels */
1544 if (pd->tunnel->version < 3)
1545 break;
1546 }
1547}
1548
1549static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
1550{
1551 pd->session = l2tp_session_find_nth(pd->tunnel, pd->session_idx);
1552 pd->session_idx++;
1553
1554 if (pd->session == NULL) {
1555 pd->session_idx = 0;
1556 pppol2tp_next_tunnel(net, pd);
1557 }
1558}
1559
1560static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
1561{
1562 struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
1563 loff_t pos = *offs;
1564 struct net *net;
1565
1566 if (!pos)
1567 goto out;
1568
1569 BUG_ON(m->private == NULL);
1570 pd = m->private;
1571 net = seq_file_net(m);
1572
1573 if (pd->tunnel == NULL)
1574 pppol2tp_next_tunnel(net, pd);
1575 else
1576 pppol2tp_next_session(net, pd);
1577
1578 /* NULL tunnel and session indicates end of list */
1579 if ((pd->tunnel == NULL) && (pd->session == NULL))
1580 pd = NULL;
1581
1582out:
1583 return pd;
1584}
1585
1586static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
1587{
1588 (*pos)++;
1589 return NULL;
1590}
1591
1592static void pppol2tp_seq_stop(struct seq_file *p, void *v)
1593{
1594 /* nothing to do */
1595}
1596
1597static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
1598{
1599 struct l2tp_tunnel *tunnel = v;
1600
1601 seq_printf(m, "\nTUNNEL '%s', %c %d\n",
1602 tunnel->name,
1603 (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
1604 atomic_read(&tunnel->ref_count) - 1);
1605 seq_printf(m, " %08x %llu/%llu/%llu %llu/%llu/%llu\n",
1606 tunnel->debug,
1607 (unsigned long long)tunnel->stats.tx_packets,
1608 (unsigned long long)tunnel->stats.tx_bytes,
1609 (unsigned long long)tunnel->stats.tx_errors,
1610 (unsigned long long)tunnel->stats.rx_packets,
1611 (unsigned long long)tunnel->stats.rx_bytes,
1612 (unsigned long long)tunnel->stats.rx_errors);
1613}
1614
1615static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
1616{
1617 struct l2tp_session *session = v;
1618 struct l2tp_tunnel *tunnel = session->tunnel;
1619 struct pppol2tp_session *ps = l2tp_session_priv(session);
1620 struct pppox_sock *po = pppox_sk(ps->sock);
1621 u32 ip = 0;
1622 u16 port = 0;
1623
1624 if (tunnel->sock) {
1625 struct inet_sock *inet = inet_sk(tunnel->sock);
1626 ip = ntohl(inet->inet_saddr);
1627 port = ntohs(inet->inet_sport);
1628 }
1629
1630 seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
1631 "%04X/%04X %d %c\n",
1632 session->name, ip, port,
1633 tunnel->tunnel_id,
1634 session->session_id,
1635 tunnel->peer_tunnel_id,
1636 session->peer_session_id,
1637 ps->sock->sk_state,
1638 (session == ps->sock->sk_user_data) ?
1639 'Y' : 'N');
1640 seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n",
1641 session->mtu, session->mru,
1642 session->recv_seq ? 'R' : '-',
1643 session->send_seq ? 'S' : '-',
1644 session->lns_mode ? "LNS" : "LAC",
1645 session->debug,
1646 jiffies_to_msecs(session->reorder_timeout));
1647 seq_printf(m, " %hu/%hu %llu/%llu/%llu %llu/%llu/%llu\n",
1648 session->nr, session->ns,
1649 (unsigned long long)session->stats.tx_packets,
1650 (unsigned long long)session->stats.tx_bytes,
1651 (unsigned long long)session->stats.tx_errors,
1652 (unsigned long long)session->stats.rx_packets,
1653 (unsigned long long)session->stats.rx_bytes,
1654 (unsigned long long)session->stats.rx_errors);
1655
1656 if (po)
1657 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
1658}
1659
1660static int pppol2tp_seq_show(struct seq_file *m, void *v)
1661{
1662 struct pppol2tp_seq_data *pd = v;
1663
1664 /* display header on line 1 */
1665 if (v == SEQ_START_TOKEN) {
1666 seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
1667 seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
1668 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1669 seq_puts(m, " SESSION name, addr/port src-tid/sid "
1670 "dest-tid/sid state user-data-ok\n");
1671 seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1672 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1673 goto out;
1674 }
1675
1676 /* Show the tunnel or session context.
1677 */
1678 if (pd->session == NULL)
1679 pppol2tp_seq_tunnel_show(m, pd->tunnel);
1680 else
1681 pppol2tp_seq_session_show(m, pd->session);
1682
1683out:
1684 return 0;
1685}
1686
1687static const struct seq_operations pppol2tp_seq_ops = {
1688 .start = pppol2tp_seq_start,
1689 .next = pppol2tp_seq_next,
1690 .stop = pppol2tp_seq_stop,
1691 .show = pppol2tp_seq_show,
1692};
1693
1694/* Called when our /proc file is opened. We allocate data for use when
1695 * iterating our tunnel / session contexts and store it in the private
1696 * data of the seq_file.
1697 */
1698static int pppol2tp_proc_open(struct inode *inode, struct file *file)
1699{
1700 return seq_open_net(inode, file, &pppol2tp_seq_ops,
1701 sizeof(struct pppol2tp_seq_data));
1702}
1703
1704static const struct file_operations pppol2tp_proc_fops = {
1705 .owner = THIS_MODULE,
1706 .open = pppol2tp_proc_open,
1707 .read = seq_read,
1708 .llseek = seq_lseek,
1709 .release = seq_release_net,
1710};
1711
1712#endif /* CONFIG_PROC_FS */
1713
1714/*****************************************************************************
1715 * Network namespace
1716 *****************************************************************************/
1717
1718static __net_init int pppol2tp_init_net(struct net *net)
1719{
1720 struct proc_dir_entry *pde;
1721 int err = 0;
1722
1723 pde = proc_net_fops_create(net, "pppol2tp", S_IRUGO, &pppol2tp_proc_fops);
1724 if (!pde) {
1725 err = -ENOMEM;
1726 goto out;
1727 }
1728
1729out:
1730 return err;
1731}
1732
1733static __net_exit void pppol2tp_exit_net(struct net *net)
1734{
1735 proc_net_remove(net, "pppol2tp");
1736}
1737
1738static struct pernet_operations pppol2tp_net_ops = {
1739 .init = pppol2tp_init_net,
1740 .exit = pppol2tp_exit_net,
1741 .id = &pppol2tp_net_id,
1742};
1743
1744/*****************************************************************************
1745 * Init and cleanup
1746 *****************************************************************************/
1747
1748static const struct proto_ops pppol2tp_ops = {
1749 .family = AF_PPPOX,
1750 .owner = THIS_MODULE,
1751 .release = pppol2tp_release,
1752 .bind = sock_no_bind,
1753 .connect = pppol2tp_connect,
1754 .socketpair = sock_no_socketpair,
1755 .accept = sock_no_accept,
1756 .getname = pppol2tp_getname,
1757 .poll = datagram_poll,
1758 .listen = sock_no_listen,
1759 .shutdown = sock_no_shutdown,
1760 .setsockopt = pppol2tp_setsockopt,
1761 .getsockopt = pppol2tp_getsockopt,
1762 .sendmsg = pppol2tp_sendmsg,
1763 .recvmsg = pppol2tp_recvmsg,
1764 .mmap = sock_no_mmap,
1765 .ioctl = pppox_ioctl,
1766};
1767
1768static struct pppox_proto pppol2tp_proto = {
1769 .create = pppol2tp_create,
1770 .ioctl = pppol2tp_ioctl
1771};
1772
1773#ifdef CONFIG_L2TP_V3
1774
1775static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = {
1776 .session_create = pppol2tp_session_create,
1777 .session_delete = pppol2tp_session_delete,
1778};
1779
1780#endif /* CONFIG_L2TP_V3 */
1781
1782static int __init pppol2tp_init(void)
1783{
1784 int err;
1785
1786 err = register_pernet_device(&pppol2tp_net_ops);
1787 if (err)
1788 goto out;
1789
1790 err = proto_register(&pppol2tp_sk_proto, 0);
1791 if (err)
1792 goto out_unregister_pppol2tp_pernet;
1793
1794 err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
1795 if (err)
1796 goto out_unregister_pppol2tp_proto;
1797
1798#ifdef CONFIG_L2TP_V3
1799 err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops);
1800 if (err)
1801 goto out_unregister_pppox;
1802#endif
1803
1804 printk(KERN_INFO "PPPoL2TP kernel driver, %s\n",
1805 PPPOL2TP_DRV_VERSION);
1806
1807out:
1808 return err;
1809
1810#ifdef CONFIG_L2TP_V3
1811out_unregister_pppox:
1812 unregister_pppox_proto(PX_PROTO_OL2TP);
1813#endif
1814out_unregister_pppol2tp_proto:
1815 proto_unregister(&pppol2tp_sk_proto);
1816out_unregister_pppol2tp_pernet:
1817 unregister_pernet_device(&pppol2tp_net_ops);
1818 goto out;
1819}
1820
1821static void __exit pppol2tp_exit(void)
1822{
1823#ifdef CONFIG_L2TP_V3
1824 l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP);
1825#endif
1826 unregister_pppox_proto(PX_PROTO_OL2TP);
1827 proto_unregister(&pppol2tp_sk_proto);
1828 unregister_pernet_device(&pppol2tp_net_ops);
1829}
1830
1831module_init(pppol2tp_init);
1832module_exit(pppol2tp_exit);
1833
1834MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1835MODULE_DESCRIPTION("PPP over L2TP over UDP");
1836MODULE_LICENSE("GPL");
1837MODULE_VERSION(PPPOL2TP_DRV_VERSION);
generated by cgit v1.2.2 (git 2.25.0) at 2025-09-19 23:27:30 -0400