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-rw-r--r--net/l2tp/l2tp_ppp.c1658
1 files changed, 1658 insertions, 0 deletions
diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c
new file mode 100644
index 000000000000..baac072761aa
--- /dev/null
+++ b/net/l2tp/l2tp_ppp.c
@@ -0,0 +1,1658 @@
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/nsproxy.h>
91#include <net/net_namespace.h>
92#include <net/netns/generic.h>
93#include <net/dst.h>
94#include <net/ip.h>
95#include <net/udp.h>
96#include <net/xfrm.h>
97
98#include <asm/byteorder.h>
99#include <asm/atomic.h>
100
101#include "l2tp_core.h"
102
103#define PPPOL2TP_DRV_VERSION "V2.0"
104
105/* Space for UDP, L2TP and PPP headers */
106#define PPPOL2TP_HEADER_OVERHEAD 40
107
108#define PRINTK(_mask, _type, _lvl, _fmt, args...) \
109 do { \
110 if ((_mask) & (_type)) \
111 printk(_lvl "PPPOL2TP: " _fmt, ##args); \
112 } while (0)
113
114/* Number of bytes to build transmit L2TP headers.
115 * Unfortunately the size is different depending on whether sequence numbers
116 * are enabled.
117 */
118#define PPPOL2TP_L2TP_HDR_SIZE_SEQ 10
119#define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ 6
120
121/* Private data of each session. This data lives at the end of struct
122 * l2tp_session, referenced via session->priv[].
123 */
124struct pppol2tp_session {
125 int owner; /* pid that opened the socket */
126
127 struct sock *sock; /* Pointer to the session
128 * PPPoX socket */
129 struct sock *tunnel_sock; /* Pointer to the tunnel UDP
130 * socket */
131 int flags; /* accessed by PPPIOCGFLAGS.
132 * Unused. */
133};
134
135static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb);
136
137static struct ppp_channel_ops pppol2tp_chan_ops = { pppol2tp_xmit , NULL };
138static const struct proto_ops pppol2tp_ops;
139
140/* Helpers to obtain tunnel/session contexts from sockets.
141 */
142static inline struct l2tp_session *pppol2tp_sock_to_session(struct sock *sk)
143{
144 struct l2tp_session *session;
145
146 if (sk == NULL)
147 return NULL;
148
149 sock_hold(sk);
150 session = (struct l2tp_session *)(sk->sk_user_data);
151 if (session == NULL) {
152 sock_put(sk);
153 goto out;
154 }
155
156 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
157
158out:
159 return session;
160}
161
162/*****************************************************************************
163 * Receive data handling
164 *****************************************************************************/
165
166static int pppol2tp_recv_payload_hook(struct sk_buff *skb)
167{
168 /* Skip PPP header, if present. In testing, Microsoft L2TP clients
169 * don't send the PPP header (PPP header compression enabled), but
170 * other clients can include the header. So we cope with both cases
171 * here. The PPP header is always FF03 when using L2TP.
172 *
173 * Note that skb->data[] isn't dereferenced from a u16 ptr here since
174 * the field may be unaligned.
175 */
176 if (!pskb_may_pull(skb, 2))
177 return 1;
178
179 if ((skb->data[0] == 0xff) && (skb->data[1] == 0x03))
180 skb_pull(skb, 2);
181
182 return 0;
183}
184
185/* Receive message. This is the recvmsg for the PPPoL2TP socket.
186 */
187static int pppol2tp_recvmsg(struct kiocb *iocb, struct socket *sock,
188 struct msghdr *msg, size_t len,
189 int flags)
190{
191 int err;
192 struct sk_buff *skb;
193 struct sock *sk = sock->sk;
194
195 err = -EIO;
196 if (sk->sk_state & PPPOX_BOUND)
197 goto end;
198
199 msg->msg_namelen = 0;
200
201 err = 0;
202 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
203 flags & MSG_DONTWAIT, &err);
204 if (!skb)
205 goto end;
206
207 if (len > skb->len)
208 len = skb->len;
209 else if (len < skb->len)
210 msg->msg_flags |= MSG_TRUNC;
211
212 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len);
213 if (likely(err == 0))
214 err = len;
215
216 kfree_skb(skb);
217end:
218 return err;
219}
220
221static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
222{
223 struct pppol2tp_session *ps = l2tp_session_priv(session);
224 struct sock *sk = NULL;
225
226 /* If the socket is bound, send it in to PPP's input queue. Otherwise
227 * queue it on the session socket.
228 */
229 sk = ps->sock;
230 if (sk == NULL)
231 goto no_sock;
232
233 if (sk->sk_state & PPPOX_BOUND) {
234 struct pppox_sock *po;
235 PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG,
236 "%s: recv %d byte data frame, passing to ppp\n",
237 session->name, data_len);
238
239 /* We need to forget all info related to the L2TP packet
240 * gathered in the skb as we are going to reuse the same
241 * skb for the inner packet.
242 * Namely we need to:
243 * - reset xfrm (IPSec) information as it applies to
244 * the outer L2TP packet and not to the inner one
245 * - release the dst to force a route lookup on the inner
246 * IP packet since skb->dst currently points to the dst
247 * of the UDP tunnel
248 * - reset netfilter information as it doesn't apply
249 * to the inner packet either
250 */
251 secpath_reset(skb);
252 skb_dst_drop(skb);
253 nf_reset(skb);
254
255 po = pppox_sk(sk);
256 ppp_input(&po->chan, skb);
257 } else {
258 PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_INFO,
259 "%s: socket not bound\n", session->name);
260
261 /* Not bound. Nothing we can do, so discard. */
262 session->stats.rx_errors++;
263 kfree_skb(skb);
264 }
265
266 return;
267
268no_sock:
269 PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_INFO,
270 "%s: no socket\n", session->name);
271 kfree_skb(skb);
272}
273
274static void pppol2tp_session_sock_hold(struct l2tp_session *session)
275{
276 struct pppol2tp_session *ps = l2tp_session_priv(session);
277
278 if (ps->sock)
279 sock_hold(ps->sock);
280}
281
282static void pppol2tp_session_sock_put(struct l2tp_session *session)
283{
284 struct pppol2tp_session *ps = l2tp_session_priv(session);
285
286 if (ps->sock)
287 sock_put(ps->sock);
288}
289
290/************************************************************************
291 * Transmit handling
292 ***********************************************************************/
293
294/* Tell how big L2TP headers are for a particular session. This
295 * depends on whether sequence numbers are being used.
296 */
297static inline int pppol2tp_l2tp_header_len(struct l2tp_session *session)
298{
299 if (session->send_seq)
300 return PPPOL2TP_L2TP_HDR_SIZE_SEQ;
301
302 return PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
303}
304
305/* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here
306 * when a user application does a sendmsg() on the session socket. L2TP and
307 * PPP headers must be inserted into the user's data.
308 */
309static int pppol2tp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
310 size_t total_len)
311{
312 static const unsigned char ppph[2] = { 0xff, 0x03 };
313 struct sock *sk = sock->sk;
314 struct sk_buff *skb;
315 int error;
316 struct l2tp_session *session;
317 struct l2tp_tunnel *tunnel;
318 struct pppol2tp_session *ps;
319
320 error = -ENOTCONN;
321 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
322 goto error;
323
324 /* Get session and tunnel contexts */
325 error = -EBADF;
326 session = pppol2tp_sock_to_session(sk);
327 if (session == NULL)
328 goto error;
329
330 ps = l2tp_session_priv(session);
331 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
332 if (tunnel == NULL)
333 goto error_put_sess;
334
335 /* Allocate a socket buffer */
336 error = -ENOMEM;
337 skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) +
338 sizeof(struct udphdr) + session->hdr_len +
339 sizeof(ppph) + total_len,
340 0, GFP_KERNEL);
341 if (!skb)
342 goto error_put_sess_tun;
343
344 /* Reserve space for headers. */
345 skb_reserve(skb, NET_SKB_PAD);
346 skb_reset_network_header(skb);
347 skb_reserve(skb, sizeof(struct iphdr));
348 skb_reset_transport_header(skb);
349 skb_reserve(skb, sizeof(struct udphdr));
350
351 /* Add PPP header */
352 skb->data[0] = ppph[0];
353 skb->data[1] = ppph[1];
354 skb_put(skb, 2);
355
356 /* Copy user data into skb */
357 error = memcpy_fromiovec(skb->data, m->msg_iov, total_len);
358 if (error < 0) {
359 kfree_skb(skb);
360 goto error_put_sess_tun;
361 }
362 skb_put(skb, total_len);
363
364 l2tp_xmit_skb(session, skb, session->hdr_len);
365
366 sock_put(ps->tunnel_sock);
367
368 return error;
369
370error_put_sess_tun:
371 sock_put(ps->tunnel_sock);
372error_put_sess:
373 sock_put(sk);
374error:
375 return error;
376}
377
378/* Transmit function called by generic PPP driver. Sends PPP frame
379 * over PPPoL2TP socket.
380 *
381 * This is almost the same as pppol2tp_sendmsg(), but rather than
382 * being called with a msghdr from userspace, it is called with a skb
383 * from the kernel.
384 *
385 * The supplied skb from ppp doesn't have enough headroom for the
386 * insertion of L2TP, UDP and IP headers so we need to allocate more
387 * headroom in the skb. This will create a cloned skb. But we must be
388 * careful in the error case because the caller will expect to free
389 * the skb it supplied, not our cloned skb. So we take care to always
390 * leave the original skb unfreed if we return an error.
391 */
392static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
393{
394 static const u8 ppph[2] = { 0xff, 0x03 };
395 struct sock *sk = (struct sock *) chan->private;
396 struct sock *sk_tun;
397 int hdr_len;
398 struct l2tp_session *session;
399 struct l2tp_tunnel *tunnel;
400 struct pppol2tp_session *ps;
401 int old_headroom;
402 int new_headroom;
403
404 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
405 goto abort;
406
407 /* Get session and tunnel contexts from the socket */
408 session = pppol2tp_sock_to_session(sk);
409 if (session == NULL)
410 goto abort;
411
412 ps = l2tp_session_priv(session);
413 sk_tun = ps->tunnel_sock;
414 if (sk_tun == NULL)
415 goto abort_put_sess;
416 tunnel = l2tp_sock_to_tunnel(sk_tun);
417 if (tunnel == NULL)
418 goto abort_put_sess;
419
420 /* What header length is configured for this session? */
421 hdr_len = pppol2tp_l2tp_header_len(session);
422
423 old_headroom = skb_headroom(skb);
424 if (skb_cow_head(skb, sizeof(ppph)))
425 goto abort_put_sess_tun;
426
427 new_headroom = skb_headroom(skb);
428 skb->truesize += new_headroom - old_headroom;
429
430 /* Setup PPP header */
431 __skb_push(skb, sizeof(ppph));
432 skb->data[0] = ppph[0];
433 skb->data[1] = ppph[1];
434
435 l2tp_xmit_skb(session, skb, hdr_len);
436
437 sock_put(sk_tun);
438 sock_put(sk);
439 return 1;
440
441abort_put_sess_tun:
442 sock_put(sk_tun);
443abort_put_sess:
444 sock_put(sk);
445abort:
446 /* Free the original skb */
447 kfree_skb(skb);
448 return 1;
449}
450
451/*****************************************************************************
452 * Session (and tunnel control) socket create/destroy.
453 *****************************************************************************/
454
455/* Called by l2tp_core when a session socket is being closed.
456 */
457static void pppol2tp_session_close(struct l2tp_session *session)
458{
459 struct pppol2tp_session *ps = l2tp_session_priv(session);
460 struct sock *sk = ps->sock;
461 struct sk_buff *skb;
462
463 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
464
465 if (session->session_id == 0)
466 goto out;
467
468 if (sk != NULL) {
469 lock_sock(sk);
470
471 if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) {
472 pppox_unbind_sock(sk);
473 sk->sk_state = PPPOX_DEAD;
474 sk->sk_state_change(sk);
475 }
476
477 /* Purge any queued data */
478 skb_queue_purge(&sk->sk_receive_queue);
479 skb_queue_purge(&sk->sk_write_queue);
480 while ((skb = skb_dequeue(&session->reorder_q))) {
481 kfree_skb(skb);
482 sock_put(sk);
483 }
484
485 release_sock(sk);
486 }
487
488out:
489 return;
490}
491
492/* Really kill the session socket. (Called from sock_put() if
493 * refcnt == 0.)
494 */
495static void pppol2tp_session_destruct(struct sock *sk)
496{
497 struct l2tp_session *session;
498
499 if (sk->sk_user_data != NULL) {
500 session = sk->sk_user_data;
501 if (session == NULL)
502 goto out;
503
504 sk->sk_user_data = NULL;
505 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
506 l2tp_session_dec_refcount(session);
507 }
508
509out:
510 return;
511}
512
513/* Called when the PPPoX socket (session) is closed.
514 */
515static int pppol2tp_release(struct socket *sock)
516{
517 struct sock *sk = sock->sk;
518 struct l2tp_session *session;
519 int error;
520
521 if (!sk)
522 return 0;
523
524 error = -EBADF;
525 lock_sock(sk);
526 if (sock_flag(sk, SOCK_DEAD) != 0)
527 goto error;
528
529 pppox_unbind_sock(sk);
530
531 /* Signal the death of the socket. */
532 sk->sk_state = PPPOX_DEAD;
533 sock_orphan(sk);
534 sock->sk = NULL;
535
536 session = pppol2tp_sock_to_session(sk);
537
538 /* Purge any queued data */
539 skb_queue_purge(&sk->sk_receive_queue);
540 skb_queue_purge(&sk->sk_write_queue);
541 if (session != NULL) {
542 struct sk_buff *skb;
543 while ((skb = skb_dequeue(&session->reorder_q))) {
544 kfree_skb(skb);
545 sock_put(sk);
546 }
547 sock_put(sk);
548 }
549
550 release_sock(sk);
551
552 /* This will delete the session context via
553 * pppol2tp_session_destruct() if the socket's refcnt drops to
554 * zero.
555 */
556 sock_put(sk);
557
558 return 0;
559
560error:
561 release_sock(sk);
562 return error;
563}
564
565static struct proto pppol2tp_sk_proto = {
566 .name = "PPPOL2TP",
567 .owner = THIS_MODULE,
568 .obj_size = sizeof(struct pppox_sock),
569};
570
571static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb)
572{
573 int rc;
574
575 rc = l2tp_udp_encap_recv(sk, skb);
576 if (rc)
577 kfree_skb(skb);
578
579 return NET_RX_SUCCESS;
580}
581
582/* socket() handler. Initialize a new struct sock.
583 */
584static int pppol2tp_create(struct net *net, struct socket *sock)
585{
586 int error = -ENOMEM;
587 struct sock *sk;
588
589 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto);
590 if (!sk)
591 goto out;
592
593 sock_init_data(sock, sk);
594
595 sock->state = SS_UNCONNECTED;
596 sock->ops = &pppol2tp_ops;
597
598 sk->sk_backlog_rcv = pppol2tp_backlog_recv;
599 sk->sk_protocol = PX_PROTO_OL2TP;
600 sk->sk_family = PF_PPPOX;
601 sk->sk_state = PPPOX_NONE;
602 sk->sk_type = SOCK_STREAM;
603 sk->sk_destruct = pppol2tp_session_destruct;
604
605 error = 0;
606
607out:
608 return error;
609}
610
611/* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
612 */
613static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
614 int sockaddr_len, int flags)
615{
616 struct sock *sk = sock->sk;
617 struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr;
618 struct pppox_sock *po = pppox_sk(sk);
619 struct l2tp_session *session = NULL;
620 struct l2tp_tunnel *tunnel;
621 struct pppol2tp_session *ps;
622 struct dst_entry *dst;
623 struct l2tp_session_cfg cfg = { 0, };
624 int error = 0;
625
626 lock_sock(sk);
627
628 error = -EINVAL;
629 if (sp->sa_protocol != PX_PROTO_OL2TP)
630 goto end;
631
632 /* Check for already bound sockets */
633 error = -EBUSY;
634 if (sk->sk_state & PPPOX_CONNECTED)
635 goto end;
636
637 /* We don't supporting rebinding anyway */
638 error = -EALREADY;
639 if (sk->sk_user_data)
640 goto end; /* socket is already attached */
641
642 /* Don't bind if s_tunnel is 0 */
643 error = -EINVAL;
644 if (sp->pppol2tp.s_tunnel == 0)
645 goto end;
646
647 /* Special case: create tunnel context if s_session and
648 * d_session is 0. Otherwise look up tunnel using supplied
649 * tunnel id.
650 */
651 if ((sp->pppol2tp.s_session == 0) && (sp->pppol2tp.d_session == 0)) {
652 error = l2tp_tunnel_create(sock_net(sk), sp->pppol2tp.fd, 2, sp->pppol2tp.s_tunnel, sp->pppol2tp.d_tunnel, NULL, &tunnel);
653 if (error < 0)
654 goto end;
655 } else {
656 tunnel = l2tp_tunnel_find(sock_net(sk), sp->pppol2tp.s_tunnel);
657
658 /* Error if we can't find the tunnel */
659 error = -ENOENT;
660 if (tunnel == NULL)
661 goto end;
662
663 /* Error if socket is not prepped */
664 if (tunnel->sock == NULL)
665 goto end;
666 }
667
668 if (tunnel->recv_payload_hook == NULL)
669 tunnel->recv_payload_hook = pppol2tp_recv_payload_hook;
670
671 /* Check that this session doesn't already exist */
672 error = -EEXIST;
673 session = l2tp_session_find(tunnel, sp->pppol2tp.s_session);
674 if (session != NULL)
675 goto end;
676
677 /* Default MTU must allow space for UDP/L2TP/PPP
678 * headers.
679 */
680 cfg.mtu = cfg.mru = 1500 - PPPOL2TP_HEADER_OVERHEAD;
681 cfg.hdr_len = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
682 cfg.debug = tunnel->debug;
683
684 /* Allocate and initialize a new session context. */
685 session = l2tp_session_create(sizeof(struct pppol2tp_session),
686 tunnel, sp->pppol2tp.s_session,
687 sp->pppol2tp.d_session, &cfg);
688 if (session == NULL) {
689 error = -ENOMEM;
690 goto end;
691 }
692
693 ps = l2tp_session_priv(session);
694 ps->owner = current->pid;
695 ps->sock = sk;
696 ps->tunnel_sock = tunnel->sock;
697
698 session->recv_skb = pppol2tp_recv;
699 session->session_close = pppol2tp_session_close;
700
701 /* We need to know each time a skb is dropped from the reorder
702 * queue.
703 */
704 session->ref = pppol2tp_session_sock_hold;
705 session->deref = pppol2tp_session_sock_put;
706
707 /* If PMTU discovery was enabled, use the MTU that was discovered */
708 dst = sk_dst_get(sk);
709 if (dst != NULL) {
710 u32 pmtu = dst_mtu(__sk_dst_get(sk));
711 if (pmtu != 0)
712 session->mtu = session->mru = pmtu -
713 PPPOL2TP_HEADER_OVERHEAD;
714 dst_release(dst);
715 }
716
717 /* Special case: if source & dest session_id == 0x0000, this
718 * socket is being created to manage the tunnel. Just set up
719 * the internal context for use by ioctl() and sockopt()
720 * handlers.
721 */
722 if ((session->session_id == 0) &&
723 (session->peer_session_id == 0)) {
724 error = 0;
725 goto out_no_ppp;
726 }
727
728 /* The only header we need to worry about is the L2TP
729 * header. This size is different depending on whether
730 * sequence numbers are enabled for the data channel.
731 */
732 po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
733
734 po->chan.private = sk;
735 po->chan.ops = &pppol2tp_chan_ops;
736 po->chan.mtu = session->mtu;
737
738 error = ppp_register_net_channel(sock_net(sk), &po->chan);
739 if (error)
740 goto end;
741
742out_no_ppp:
743 /* This is how we get the session context from the socket. */
744 sk->sk_user_data = session;
745 sk->sk_state = PPPOX_CONNECTED;
746 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
747 "%s: created\n", session->name);
748
749end:
750 release_sock(sk);
751
752 return error;
753}
754
755/* getname() support.
756 */
757static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
758 int *usockaddr_len, int peer)
759{
760 int len = sizeof(struct sockaddr_pppol2tp);
761 struct sockaddr_pppol2tp sp;
762 int error = 0;
763 struct l2tp_session *session;
764 struct l2tp_tunnel *tunnel;
765 struct sock *sk = sock->sk;
766 struct inet_sock *inet;
767 struct pppol2tp_session *pls;
768
769 error = -ENOTCONN;
770 if (sk == NULL)
771 goto end;
772 if (sk->sk_state != PPPOX_CONNECTED)
773 goto end;
774
775 error = -EBADF;
776 session = pppol2tp_sock_to_session(sk);
777 if (session == NULL)
778 goto end;
779
780 pls = l2tp_session_priv(session);
781 tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock);
782 if (tunnel == NULL) {
783 error = -EBADF;
784 goto end_put_sess;
785 }
786
787 memset(&sp, 0, len);
788 sp.sa_family = AF_PPPOX;
789 sp.sa_protocol = PX_PROTO_OL2TP;
790 sp.pppol2tp.fd = tunnel->fd;
791 sp.pppol2tp.pid = pls->owner;
792 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
793 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
794 sp.pppol2tp.s_session = session->session_id;
795 sp.pppol2tp.d_session = session->peer_session_id;
796 inet = inet_sk(sk);
797 sp.pppol2tp.addr.sin_family = AF_INET;
798 sp.pppol2tp.addr.sin_port = inet->inet_dport;
799 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
800
801 memcpy(uaddr, &sp, len);
802
803 *usockaddr_len = len;
804
805 sock_put(pls->tunnel_sock);
806end_put_sess:
807 sock_put(sk);
808 error = 0;
809
810end:
811 return error;
812}
813
814/****************************************************************************
815 * ioctl() handlers.
816 *
817 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
818 * sockets. However, in order to control kernel tunnel features, we allow
819 * userspace to create a special "tunnel" PPPoX socket which is used for
820 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
821 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
822 * calls.
823 ****************************************************************************/
824
825static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest,
826 struct l2tp_stats *stats)
827{
828 dest->tx_packets = stats->tx_packets;
829 dest->tx_bytes = stats->tx_bytes;
830 dest->tx_errors = stats->tx_errors;
831 dest->rx_packets = stats->rx_packets;
832 dest->rx_bytes = stats->rx_bytes;
833 dest->rx_seq_discards = stats->rx_seq_discards;
834 dest->rx_oos_packets = stats->rx_oos_packets;
835 dest->rx_errors = stats->rx_errors;
836}
837
838/* Session ioctl helper.
839 */
840static int pppol2tp_session_ioctl(struct l2tp_session *session,
841 unsigned int cmd, unsigned long arg)
842{
843 struct ifreq ifr;
844 int err = 0;
845 struct sock *sk;
846 int val = (int) arg;
847 struct pppol2tp_session *ps = l2tp_session_priv(session);
848 struct l2tp_tunnel *tunnel = session->tunnel;
849 struct pppol2tp_ioc_stats stats;
850
851 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG,
852 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
853 session->name, cmd, arg);
854
855 sk = ps->sock;
856 sock_hold(sk);
857
858 switch (cmd) {
859 case SIOCGIFMTU:
860 err = -ENXIO;
861 if (!(sk->sk_state & PPPOX_CONNECTED))
862 break;
863
864 err = -EFAULT;
865 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
866 break;
867 ifr.ifr_mtu = session->mtu;
868 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
869 break;
870
871 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
872 "%s: get mtu=%d\n", session->name, session->mtu);
873 err = 0;
874 break;
875
876 case SIOCSIFMTU:
877 err = -ENXIO;
878 if (!(sk->sk_state & PPPOX_CONNECTED))
879 break;
880
881 err = -EFAULT;
882 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
883 break;
884
885 session->mtu = ifr.ifr_mtu;
886
887 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
888 "%s: set mtu=%d\n", session->name, session->mtu);
889 err = 0;
890 break;
891
892 case PPPIOCGMRU:
893 err = -ENXIO;
894 if (!(sk->sk_state & PPPOX_CONNECTED))
895 break;
896
897 err = -EFAULT;
898 if (put_user(session->mru, (int __user *) arg))
899 break;
900
901 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
902 "%s: get mru=%d\n", session->name, session->mru);
903 err = 0;
904 break;
905
906 case PPPIOCSMRU:
907 err = -ENXIO;
908 if (!(sk->sk_state & PPPOX_CONNECTED))
909 break;
910
911 err = -EFAULT;
912 if (get_user(val, (int __user *) arg))
913 break;
914
915 session->mru = val;
916 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
917 "%s: set mru=%d\n", session->name, session->mru);
918 err = 0;
919 break;
920
921 case PPPIOCGFLAGS:
922 err = -EFAULT;
923 if (put_user(ps->flags, (int __user *) arg))
924 break;
925
926 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
927 "%s: get flags=%d\n", session->name, ps->flags);
928 err = 0;
929 break;
930
931 case PPPIOCSFLAGS:
932 err = -EFAULT;
933 if (get_user(val, (int __user *) arg))
934 break;
935 ps->flags = val;
936 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
937 "%s: set flags=%d\n", session->name, ps->flags);
938 err = 0;
939 break;
940
941 case PPPIOCGL2TPSTATS:
942 err = -ENXIO;
943 if (!(sk->sk_state & PPPOX_CONNECTED))
944 break;
945
946 memset(&stats, 0, sizeof(stats));
947 stats.tunnel_id = tunnel->tunnel_id;
948 stats.session_id = session->session_id;
949 pppol2tp_copy_stats(&stats, &session->stats);
950 if (copy_to_user((void __user *) arg, &stats,
951 sizeof(stats)))
952 break;
953 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
954 "%s: get L2TP stats\n", session->name);
955 err = 0;
956 break;
957
958 default:
959 err = -ENOSYS;
960 break;
961 }
962
963 sock_put(sk);
964
965 return err;
966}
967
968/* Tunnel ioctl helper.
969 *
970 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
971 * specifies a session_id, the session ioctl handler is called. This allows an
972 * application to retrieve session stats via a tunnel socket.
973 */
974static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
975 unsigned int cmd, unsigned long arg)
976{
977 int err = 0;
978 struct sock *sk;
979 struct pppol2tp_ioc_stats stats;
980
981 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG,
982 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
983 tunnel->name, cmd, arg);
984
985 sk = tunnel->sock;
986 sock_hold(sk);
987
988 switch (cmd) {
989 case PPPIOCGL2TPSTATS:
990 err = -ENXIO;
991 if (!(sk->sk_state & PPPOX_CONNECTED))
992 break;
993
994 if (copy_from_user(&stats, (void __user *) arg,
995 sizeof(stats))) {
996 err = -EFAULT;
997 break;
998 }
999 if (stats.session_id != 0) {
1000 /* resend to session ioctl handler */
1001 struct l2tp_session *session =
1002 l2tp_session_find(tunnel, stats.session_id);
1003 if (session != NULL)
1004 err = pppol2tp_session_ioctl(session, cmd, arg);
1005 else
1006 err = -EBADR;
1007 break;
1008 }
1009#ifdef CONFIG_XFRM
1010 stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
1011#endif
1012 pppol2tp_copy_stats(&stats, &tunnel->stats);
1013 if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) {
1014 err = -EFAULT;
1015 break;
1016 }
1017 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1018 "%s: get L2TP stats\n", tunnel->name);
1019 err = 0;
1020 break;
1021
1022 default:
1023 err = -ENOSYS;
1024 break;
1025 }
1026
1027 sock_put(sk);
1028
1029 return err;
1030}
1031
1032/* Main ioctl() handler.
1033 * Dispatch to tunnel or session helpers depending on the socket.
1034 */
1035static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
1036 unsigned long arg)
1037{
1038 struct sock *sk = sock->sk;
1039 struct l2tp_session *session;
1040 struct l2tp_tunnel *tunnel;
1041 struct pppol2tp_session *ps;
1042 int err;
1043
1044 if (!sk)
1045 return 0;
1046
1047 err = -EBADF;
1048 if (sock_flag(sk, SOCK_DEAD) != 0)
1049 goto end;
1050
1051 err = -ENOTCONN;
1052 if ((sk->sk_user_data == NULL) ||
1053 (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
1054 goto end;
1055
1056 /* Get session context from the socket */
1057 err = -EBADF;
1058 session = pppol2tp_sock_to_session(sk);
1059 if (session == NULL)
1060 goto end;
1061
1062 /* Special case: if session's session_id is zero, treat ioctl as a
1063 * tunnel ioctl
1064 */
1065 ps = l2tp_session_priv(session);
1066 if ((session->session_id == 0) &&
1067 (session->peer_session_id == 0)) {
1068 err = -EBADF;
1069 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1070 if (tunnel == NULL)
1071 goto end_put_sess;
1072
1073 err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
1074 sock_put(ps->tunnel_sock);
1075 goto end_put_sess;
1076 }
1077
1078 err = pppol2tp_session_ioctl(session, cmd, arg);
1079
1080end_put_sess:
1081 sock_put(sk);
1082end:
1083 return err;
1084}
1085
1086/*****************************************************************************
1087 * setsockopt() / getsockopt() support.
1088 *
1089 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1090 * sockets. In order to control kernel tunnel features, we allow userspace to
1091 * create a special "tunnel" PPPoX socket which is used for control only.
1092 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1093 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1094 *****************************************************************************/
1095
1096/* Tunnel setsockopt() helper.
1097 */
1098static int pppol2tp_tunnel_setsockopt(struct sock *sk,
1099 struct l2tp_tunnel *tunnel,
1100 int optname, int val)
1101{
1102 int err = 0;
1103
1104 switch (optname) {
1105 case PPPOL2TP_SO_DEBUG:
1106 tunnel->debug = val;
1107 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1108 "%s: set debug=%x\n", tunnel->name, tunnel->debug);
1109 break;
1110
1111 default:
1112 err = -ENOPROTOOPT;
1113 break;
1114 }
1115
1116 return err;
1117}
1118
1119/* Session setsockopt helper.
1120 */
1121static int pppol2tp_session_setsockopt(struct sock *sk,
1122 struct l2tp_session *session,
1123 int optname, int val)
1124{
1125 int err = 0;
1126 struct pppol2tp_session *ps = l2tp_session_priv(session);
1127
1128 switch (optname) {
1129 case PPPOL2TP_SO_RECVSEQ:
1130 if ((val != 0) && (val != 1)) {
1131 err = -EINVAL;
1132 break;
1133 }
1134 session->recv_seq = val ? -1 : 0;
1135 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1136 "%s: set recv_seq=%d\n", session->name, session->recv_seq);
1137 break;
1138
1139 case PPPOL2TP_SO_SENDSEQ:
1140 if ((val != 0) && (val != 1)) {
1141 err = -EINVAL;
1142 break;
1143 }
1144 session->send_seq = val ? -1 : 0;
1145 {
1146 struct sock *ssk = ps->sock;
1147 struct pppox_sock *po = pppox_sk(ssk);
1148 po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
1149 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1150 }
1151 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1152 "%s: set send_seq=%d\n", session->name, session->send_seq);
1153 break;
1154
1155 case PPPOL2TP_SO_LNSMODE:
1156 if ((val != 0) && (val != 1)) {
1157 err = -EINVAL;
1158 break;
1159 }
1160 session->lns_mode = val ? -1 : 0;
1161 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1162 "%s: set lns_mode=%d\n", session->name, session->lns_mode);
1163 break;
1164
1165 case PPPOL2TP_SO_DEBUG:
1166 session->debug = val;
1167 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1168 "%s: set debug=%x\n", session->name, session->debug);
1169 break;
1170
1171 case PPPOL2TP_SO_REORDERTO:
1172 session->reorder_timeout = msecs_to_jiffies(val);
1173 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1174 "%s: set reorder_timeout=%d\n", session->name, session->reorder_timeout);
1175 break;
1176
1177 default:
1178 err = -ENOPROTOOPT;
1179 break;
1180 }
1181
1182 return err;
1183}
1184
1185/* Main setsockopt() entry point.
1186 * Does API checks, then calls either the tunnel or session setsockopt
1187 * handler, according to whether the PPPoL2TP socket is a for a regular
1188 * session or the special tunnel type.
1189 */
1190static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
1191 char __user *optval, unsigned int optlen)
1192{
1193 struct sock *sk = sock->sk;
1194 struct l2tp_session *session;
1195 struct l2tp_tunnel *tunnel;
1196 struct pppol2tp_session *ps;
1197 int val;
1198 int err;
1199
1200 if (level != SOL_PPPOL2TP)
1201 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
1202
1203 if (optlen < sizeof(int))
1204 return -EINVAL;
1205
1206 if (get_user(val, (int __user *)optval))
1207 return -EFAULT;
1208
1209 err = -ENOTCONN;
1210 if (sk->sk_user_data == NULL)
1211 goto end;
1212
1213 /* Get session context from the socket */
1214 err = -EBADF;
1215 session = pppol2tp_sock_to_session(sk);
1216 if (session == NULL)
1217 goto end;
1218
1219 /* Special case: if session_id == 0x0000, treat as operation on tunnel
1220 */
1221 ps = l2tp_session_priv(session);
1222 if ((session->session_id == 0) &&
1223 (session->peer_session_id == 0)) {
1224 err = -EBADF;
1225 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1226 if (tunnel == NULL)
1227 goto end_put_sess;
1228
1229 err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
1230 sock_put(ps->tunnel_sock);
1231 } else
1232 err = pppol2tp_session_setsockopt(sk, session, optname, val);
1233
1234 err = 0;
1235
1236end_put_sess:
1237 sock_put(sk);
1238end:
1239 return err;
1240}
1241
1242/* Tunnel getsockopt helper. Called with sock locked.
1243 */
1244static int pppol2tp_tunnel_getsockopt(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 *val = tunnel->debug;
1253 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1254 "%s: get debug=%x\n", tunnel->name, tunnel->debug);
1255 break;
1256
1257 default:
1258 err = -ENOPROTOOPT;
1259 break;
1260 }
1261
1262 return err;
1263}
1264
1265/* Session getsockopt helper. Called with sock locked.
1266 */
1267static int pppol2tp_session_getsockopt(struct sock *sk,
1268 struct l2tp_session *session,
1269 int optname, int *val)
1270{
1271 int err = 0;
1272
1273 switch (optname) {
1274 case PPPOL2TP_SO_RECVSEQ:
1275 *val = session->recv_seq;
1276 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1277 "%s: get recv_seq=%d\n", session->name, *val);
1278 break;
1279
1280 case PPPOL2TP_SO_SENDSEQ:
1281 *val = session->send_seq;
1282 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1283 "%s: get send_seq=%d\n", session->name, *val);
1284 break;
1285
1286 case PPPOL2TP_SO_LNSMODE:
1287 *val = session->lns_mode;
1288 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1289 "%s: get lns_mode=%d\n", session->name, *val);
1290 break;
1291
1292 case PPPOL2TP_SO_DEBUG:
1293 *val = session->debug;
1294 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1295 "%s: get debug=%d\n", session->name, *val);
1296 break;
1297
1298 case PPPOL2TP_SO_REORDERTO:
1299 *val = (int) jiffies_to_msecs(session->reorder_timeout);
1300 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1301 "%s: get reorder_timeout=%d\n", session->name, *val);
1302 break;
1303
1304 default:
1305 err = -ENOPROTOOPT;
1306 }
1307
1308 return err;
1309}
1310
1311/* Main getsockopt() entry point.
1312 * Does API checks, then calls either the tunnel or session getsockopt
1313 * handler, according to whether the PPPoX socket is a for a regular session
1314 * or the special tunnel type.
1315 */
1316static int pppol2tp_getsockopt(struct socket *sock, int level,
1317 int optname, char __user *optval, int __user *optlen)
1318{
1319 struct sock *sk = sock->sk;
1320 struct l2tp_session *session;
1321 struct l2tp_tunnel *tunnel;
1322 int val, len;
1323 int err;
1324 struct pppol2tp_session *ps;
1325
1326 if (level != SOL_PPPOL2TP)
1327 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1328
1329 if (get_user(len, (int __user *) optlen))
1330 return -EFAULT;
1331
1332 len = min_t(unsigned int, len, sizeof(int));
1333
1334 if (len < 0)
1335 return -EINVAL;
1336
1337 err = -ENOTCONN;
1338 if (sk->sk_user_data == NULL)
1339 goto end;
1340
1341 /* Get the session context */
1342 err = -EBADF;
1343 session = pppol2tp_sock_to_session(sk);
1344 if (session == NULL)
1345 goto end;
1346
1347 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1348 ps = l2tp_session_priv(session);
1349 if ((session->session_id == 0) &&
1350 (session->peer_session_id == 0)) {
1351 err = -EBADF;
1352 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1353 if (tunnel == NULL)
1354 goto end_put_sess;
1355
1356 err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
1357 sock_put(ps->tunnel_sock);
1358 } else
1359 err = pppol2tp_session_getsockopt(sk, session, optname, &val);
1360
1361 err = -EFAULT;
1362 if (put_user(len, (int __user *) optlen))
1363 goto end_put_sess;
1364
1365 if (copy_to_user((void __user *) optval, &val, len))
1366 goto end_put_sess;
1367
1368 err = 0;
1369
1370end_put_sess:
1371 sock_put(sk);
1372end:
1373 return err;
1374}
1375
1376/*****************************************************************************
1377 * /proc filesystem for debug
1378 *****************************************************************************/
1379
1380static unsigned int pppol2tp_net_id;
1381
1382#ifdef CONFIG_PROC_FS
1383
1384struct pppol2tp_seq_data {
1385 struct seq_net_private p;
1386 int tunnel_idx; /* current tunnel */
1387 int session_idx; /* index of session within current tunnel */
1388 struct l2tp_tunnel *tunnel;
1389 struct l2tp_session *session; /* NULL means get next tunnel */
1390};
1391
1392static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
1393{
1394 pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx);
1395 pd->tunnel_idx++;
1396}
1397
1398static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
1399{
1400 pd->session = l2tp_session_find_nth(pd->tunnel, pd->session_idx);
1401 pd->session_idx++;
1402 if (pd->session == NULL) {
1403 pd->session_idx = 0;
1404 pppol2tp_next_tunnel(net, pd);
1405 }
1406}
1407
1408static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
1409{
1410 struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
1411 loff_t pos = *offs;
1412 struct net *net;
1413
1414 if (!pos)
1415 goto out;
1416
1417 BUG_ON(m->private == NULL);
1418 pd = m->private;
1419 net = seq_file_net(m);
1420
1421 if (pd->tunnel == NULL)
1422 pppol2tp_next_tunnel(net, pd);
1423 else
1424 pppol2tp_next_session(net, pd);
1425
1426 /* NULL tunnel and session indicates end of list */
1427 if ((pd->tunnel == NULL) && (pd->session == NULL))
1428 pd = NULL;
1429
1430out:
1431 return pd;
1432}
1433
1434static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
1435{
1436 (*pos)++;
1437 return NULL;
1438}
1439
1440static void pppol2tp_seq_stop(struct seq_file *p, void *v)
1441{
1442 /* nothing to do */
1443}
1444
1445static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
1446{
1447 struct l2tp_tunnel *tunnel = v;
1448
1449 seq_printf(m, "\nTUNNEL '%s', %c %d\n",
1450 tunnel->name,
1451 (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
1452 atomic_read(&tunnel->ref_count) - 1);
1453 seq_printf(m, " %08x %llu/%llu/%llu %llu/%llu/%llu\n",
1454 tunnel->debug,
1455 (unsigned long long)tunnel->stats.tx_packets,
1456 (unsigned long long)tunnel->stats.tx_bytes,
1457 (unsigned long long)tunnel->stats.tx_errors,
1458 (unsigned long long)tunnel->stats.rx_packets,
1459 (unsigned long long)tunnel->stats.rx_bytes,
1460 (unsigned long long)tunnel->stats.rx_errors);
1461}
1462
1463static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
1464{
1465 struct l2tp_session *session = v;
1466 struct l2tp_tunnel *tunnel = session->tunnel;
1467 struct pppol2tp_session *ps = l2tp_session_priv(session);
1468 u32 ip = 0;
1469 u16 port = 0;
1470
1471 if (tunnel->sock) {
1472 struct inet_sock *inet = inet_sk(tunnel->sock);
1473 ip = ntohl(inet->inet_saddr);
1474 port = ntohs(inet->inet_sport);
1475 }
1476
1477 seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
1478 "%04X/%04X %d %c\n",
1479 session->name, ip, port,
1480 tunnel->tunnel_id,
1481 session->session_id,
1482 tunnel->peer_tunnel_id,
1483 session->peer_session_id,
1484 ps->sock->sk_state,
1485 (session == ps->sock->sk_user_data) ?
1486 'Y' : 'N');
1487 seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n",
1488 session->mtu, session->mru,
1489 session->recv_seq ? 'R' : '-',
1490 session->send_seq ? 'S' : '-',
1491 session->lns_mode ? "LNS" : "LAC",
1492 session->debug,
1493 jiffies_to_msecs(session->reorder_timeout));
1494 seq_printf(m, " %hu/%hu %llu/%llu/%llu %llu/%llu/%llu\n",
1495 session->nr, session->ns,
1496 (unsigned long long)session->stats.tx_packets,
1497 (unsigned long long)session->stats.tx_bytes,
1498 (unsigned long long)session->stats.tx_errors,
1499 (unsigned long long)session->stats.rx_packets,
1500 (unsigned long long)session->stats.rx_bytes,
1501 (unsigned long long)session->stats.rx_errors);
1502}
1503
1504static int pppol2tp_seq_show(struct seq_file *m, void *v)
1505{
1506 struct pppol2tp_seq_data *pd = v;
1507
1508 /* display header on line 1 */
1509 if (v == SEQ_START_TOKEN) {
1510 seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
1511 seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
1512 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1513 seq_puts(m, " SESSION name, addr/port src-tid/sid "
1514 "dest-tid/sid state user-data-ok\n");
1515 seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1516 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1517 goto out;
1518 }
1519
1520 /* Show the tunnel or session context.
1521 */
1522 if (pd->session == NULL)
1523 pppol2tp_seq_tunnel_show(m, pd->tunnel);
1524 else
1525 pppol2tp_seq_session_show(m, pd->session);
1526
1527out:
1528 return 0;
1529}
1530
1531static const struct seq_operations pppol2tp_seq_ops = {
1532 .start = pppol2tp_seq_start,
1533 .next = pppol2tp_seq_next,
1534 .stop = pppol2tp_seq_stop,
1535 .show = pppol2tp_seq_show,
1536};
1537
1538/* Called when our /proc file is opened. We allocate data for use when
1539 * iterating our tunnel / session contexts and store it in the private
1540 * data of the seq_file.
1541 */
1542static int pppol2tp_proc_open(struct inode *inode, struct file *file)
1543{
1544 return seq_open_net(inode, file, &pppol2tp_seq_ops,
1545 sizeof(struct pppol2tp_seq_data));
1546}
1547
1548static const struct file_operations pppol2tp_proc_fops = {
1549 .owner = THIS_MODULE,
1550 .open = pppol2tp_proc_open,
1551 .read = seq_read,
1552 .llseek = seq_lseek,
1553 .release = seq_release_net,
1554};
1555
1556#endif /* CONFIG_PROC_FS */
1557
1558/*****************************************************************************
1559 * Network namespace
1560 *****************************************************************************/
1561
1562static __net_init int pppol2tp_init_net(struct net *net)
1563{
1564 struct proc_dir_entry *pde;
1565 int err = 0;
1566
1567 pde = proc_net_fops_create(net, "pppol2tp", S_IRUGO, &pppol2tp_proc_fops);
1568 if (!pde) {
1569 err = -ENOMEM;
1570 goto out;
1571 }
1572
1573out:
1574 return err;
1575}
1576
1577static __net_exit void pppol2tp_exit_net(struct net *net)
1578{
1579 proc_net_remove(net, "pppol2tp");
1580}
1581
1582static struct pernet_operations pppol2tp_net_ops = {
1583 .init = pppol2tp_init_net,
1584 .exit = pppol2tp_exit_net,
1585 .id = &pppol2tp_net_id,
1586};
1587
1588/*****************************************************************************
1589 * Init and cleanup
1590 *****************************************************************************/
1591
1592static const struct proto_ops pppol2tp_ops = {
1593 .family = AF_PPPOX,
1594 .owner = THIS_MODULE,
1595 .release = pppol2tp_release,
1596 .bind = sock_no_bind,
1597 .connect = pppol2tp_connect,
1598 .socketpair = sock_no_socketpair,
1599 .accept = sock_no_accept,
1600 .getname = pppol2tp_getname,
1601 .poll = datagram_poll,
1602 .listen = sock_no_listen,
1603 .shutdown = sock_no_shutdown,
1604 .setsockopt = pppol2tp_setsockopt,
1605 .getsockopt = pppol2tp_getsockopt,
1606 .sendmsg = pppol2tp_sendmsg,
1607 .recvmsg = pppol2tp_recvmsg,
1608 .mmap = sock_no_mmap,
1609 .ioctl = pppox_ioctl,
1610};
1611
1612static struct pppox_proto pppol2tp_proto = {
1613 .create = pppol2tp_create,
1614 .ioctl = pppol2tp_ioctl
1615};
1616
1617static int __init pppol2tp_init(void)
1618{
1619 int err;
1620
1621 err = register_pernet_device(&pppol2tp_net_ops);
1622 if (err)
1623 goto out;
1624
1625 err = proto_register(&pppol2tp_sk_proto, 0);
1626 if (err)
1627 goto out_unregister_pppol2tp_pernet;
1628
1629 err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
1630 if (err)
1631 goto out_unregister_pppol2tp_proto;
1632
1633 printk(KERN_INFO "PPPoL2TP kernel driver, %s\n",
1634 PPPOL2TP_DRV_VERSION);
1635
1636out:
1637 return err;
1638out_unregister_pppol2tp_proto:
1639 proto_unregister(&pppol2tp_sk_proto);
1640out_unregister_pppol2tp_pernet:
1641 unregister_pernet_device(&pppol2tp_net_ops);
1642 goto out;
1643}
1644
1645static void __exit pppol2tp_exit(void)
1646{
1647 unregister_pppox_proto(PX_PROTO_OL2TP);
1648 proto_unregister(&pppol2tp_sk_proto);
1649 unregister_pernet_device(&pppol2tp_net_ops);
1650}
1651
1652module_init(pppol2tp_init);
1653module_exit(pppol2tp_exit);
1654
1655MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1656MODULE_DESCRIPTION("PPP over L2TP over UDP");
1657MODULE_LICENSE("GPL");
1658MODULE_VERSION(PPPOL2TP_DRV_VERSION);
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-29 23:00:18 -0500