1 /*****************************************************************************
2 * Linux PPP over L2TP (PPPoX/PPPoL2TP) Sockets
4 * PPPoX --- Generic PPP encapsulation socket family
5 * PPPoL2TP --- PPP over L2TP (RFC 2661)
9 * Authors: James Chapman (jchapman@katalix.com)
11 * Based on original work by Martijn van Oosterhout <kleptog@svana.org>
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.
21 /* This driver handles only L2TP data frames; control frames are handled by a
22 * userspace application.
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.
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.
33 * Here's example userspace code to create a socket for sending/receiving data
34 * over an L2TP session:-
36 * struct sockaddr_pppol2tp sax;
40 * fd = socket(AF_PPPOX, SOCK_DGRAM, PX_PROTO_OL2TP);
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;
53 * session_fd = connect(fd, (struct sockaddr *)&sax, sizeof(sax));
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.
60 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
62 #include <linux/module.h>
63 #include <linux/string.h>
64 #include <linux/list.h>
65 #include <linux/uaccess.h>
67 #include <linux/kernel.h>
68 #include <linux/spinlock.h>
69 #include <linux/kthread.h>
70 #include <linux/sched.h>
71 #include <linux/slab.h>
72 #include <linux/errno.h>
73 #include <linux/jiffies.h>
75 #include <linux/netdevice.h>
76 #include <linux/net.h>
77 #include <linux/inetdevice.h>
78 #include <linux/skbuff.h>
79 #include <linux/init.h>
81 #include <linux/udp.h>
82 #include <linux/if_pppox.h>
83 #include <linux/if_pppol2tp.h>
85 #include <linux/ppp_channel.h>
86 #include <linux/ppp_defs.h>
87 #include <linux/ppp-ioctl.h>
88 #include <linux/file.h>
89 #include <linux/hash.h>
90 #include <linux/sort.h>
91 #include <linux/proc_fs.h>
92 #include <linux/l2tp.h>
93 #include <linux/nsproxy.h>
94 #include <net/net_namespace.h>
95 #include <net/netns/generic.h>
101 #include <asm/byteorder.h>
102 #include <linux/atomic.h>
104 #include "l2tp_core.h"
106 #define PPPOL2TP_DRV_VERSION "V2.0"
108 /* Space for UDP, L2TP and PPP headers */
109 #define PPPOL2TP_HEADER_OVERHEAD 40
111 /* Number of bytes to build transmit L2TP headers.
112 * Unfortunately the size is different depending on whether sequence numbers
115 #define PPPOL2TP_L2TP_HDR_SIZE_SEQ 10
116 #define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ 6
118 /* Private data of each session. This data lives at the end of struct
119 * l2tp_session, referenced via session->priv[].
121 struct pppol2tp_session
{
122 int owner
; /* pid that opened the socket */
124 struct sock
*sock
; /* Pointer to the session
126 struct sock
*tunnel_sock
; /* Pointer to the tunnel UDP
128 int flags
; /* accessed by PPPIOCGFLAGS.
132 static int pppol2tp_xmit(struct ppp_channel
*chan
, struct sk_buff
*skb
);
134 static const struct ppp_channel_ops pppol2tp_chan_ops
= {
135 .start_xmit
= pppol2tp_xmit
,
138 static const struct proto_ops pppol2tp_ops
;
140 /* Helpers to obtain tunnel/session contexts from sockets.
142 static inline struct l2tp_session
*pppol2tp_sock_to_session(struct sock
*sk
)
144 struct l2tp_session
*session
;
150 session
= (struct l2tp_session
*)(sk
->sk_user_data
);
151 if (session
== NULL
) {
156 BUG_ON(session
->magic
!= L2TP_SESSION_MAGIC
);
162 /*****************************************************************************
163 * Receive data handling
164 *****************************************************************************/
166 static int pppol2tp_recv_payload_hook(struct sk_buff
*skb
)
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.
173 * Note that skb->data[] isn't dereferenced from a u16 ptr here since
174 * the field may be unaligned.
176 if (!pskb_may_pull(skb
, 2))
179 if ((skb
->data
[0] == 0xff) && (skb
->data
[1] == 0x03))
185 /* Receive message. This is the recvmsg for the PPPoL2TP socket.
187 static int pppol2tp_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
188 struct msghdr
*msg
, size_t len
,
193 struct sock
*sk
= sock
->sk
;
196 if (sk
->sk_state
& PPPOX_BOUND
)
199 msg
->msg_namelen
= 0;
202 skb
= skb_recv_datagram(sk
, flags
& ~MSG_DONTWAIT
,
203 flags
& MSG_DONTWAIT
, &err
);
209 else if (len
< skb
->len
)
210 msg
->msg_flags
|= MSG_TRUNC
;
212 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, len
);
213 if (likely(err
== 0))
221 static void pppol2tp_recv(struct l2tp_session
*session
, struct sk_buff
*skb
, int data_len
)
223 struct pppol2tp_session
*ps
= l2tp_session_priv(session
);
224 struct sock
*sk
= NULL
;
226 /* If the socket is bound, send it in to PPP's input queue. Otherwise
227 * queue it on the session socket.
233 if (sk
->sk_state
& PPPOX_BOUND
) {
234 struct pppox_sock
*po
;
235 l2tp_dbg(session
, PPPOL2TP_MSG_DATA
,
236 "%s: recv %d byte data frame, passing to ppp\n",
237 session
->name
, data_len
);
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.
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
248 * - reset netfilter information as it doesn't apply
249 * to the inner packet either
256 ppp_input(&po
->chan
, skb
);
258 l2tp_info(session
, PPPOL2TP_MSG_DATA
, "%s: socket not bound\n",
261 /* Not bound. Nothing we can do, so discard. */
262 session
->stats
.rx_errors
++;
269 l2tp_info(session
, PPPOL2TP_MSG_DATA
, "%s: no socket\n", session
->name
);
273 static void pppol2tp_session_sock_hold(struct l2tp_session
*session
)
275 struct pppol2tp_session
*ps
= l2tp_session_priv(session
);
281 static void pppol2tp_session_sock_put(struct l2tp_session
*session
)
283 struct pppol2tp_session
*ps
= l2tp_session_priv(session
);
289 /************************************************************************
291 ***********************************************************************/
293 /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here
294 * when a user application does a sendmsg() on the session socket. L2TP and
295 * PPP headers must be inserted into the user's data.
297 static int pppol2tp_sendmsg(struct kiocb
*iocb
, struct socket
*sock
, struct msghdr
*m
,
300 static const unsigned char ppph
[2] = { 0xff, 0x03 };
301 struct sock
*sk
= sock
->sk
;
304 struct l2tp_session
*session
;
305 struct l2tp_tunnel
*tunnel
;
306 struct pppol2tp_session
*ps
;
310 if (sock_flag(sk
, SOCK_DEAD
) || !(sk
->sk_state
& PPPOX_CONNECTED
))
313 /* Get session and tunnel contexts */
315 session
= pppol2tp_sock_to_session(sk
);
319 ps
= l2tp_session_priv(session
);
320 tunnel
= l2tp_sock_to_tunnel(ps
->tunnel_sock
);
324 uhlen
= (tunnel
->encap
== L2TP_ENCAPTYPE_UDP
) ? sizeof(struct udphdr
) : 0;
326 /* Allocate a socket buffer */
328 skb
= sock_wmalloc(sk
, NET_SKB_PAD
+ sizeof(struct iphdr
) +
329 uhlen
+ session
->hdr_len
+
330 sizeof(ppph
) + total_len
,
333 goto error_put_sess_tun
;
335 /* Reserve space for headers. */
336 skb_reserve(skb
, NET_SKB_PAD
);
337 skb_reset_network_header(skb
);
338 skb_reserve(skb
, sizeof(struct iphdr
));
339 skb_reset_transport_header(skb
);
340 skb_reserve(skb
, uhlen
);
343 skb
->data
[0] = ppph
[0];
344 skb
->data
[1] = ppph
[1];
347 /* Copy user data into skb */
348 error
= memcpy_fromiovec(skb
->data
, m
->msg_iov
, total_len
);
351 goto error_put_sess_tun
;
353 skb_put(skb
, total_len
);
355 l2tp_xmit_skb(session
, skb
, session
->hdr_len
);
357 sock_put(ps
->tunnel_sock
);
362 sock_put(ps
->tunnel_sock
);
369 /* Transmit function called by generic PPP driver. Sends PPP frame
370 * over PPPoL2TP socket.
372 * This is almost the same as pppol2tp_sendmsg(), but rather than
373 * being called with a msghdr from userspace, it is called with a skb
376 * The supplied skb from ppp doesn't have enough headroom for the
377 * insertion of L2TP, UDP and IP headers so we need to allocate more
378 * headroom in the skb. This will create a cloned skb. But we must be
379 * careful in the error case because the caller will expect to free
380 * the skb it supplied, not our cloned skb. So we take care to always
381 * leave the original skb unfreed if we return an error.
383 static int pppol2tp_xmit(struct ppp_channel
*chan
, struct sk_buff
*skb
)
385 static const u8 ppph
[2] = { 0xff, 0x03 };
386 struct sock
*sk
= (struct sock
*) chan
->private;
388 struct l2tp_session
*session
;
389 struct l2tp_tunnel
*tunnel
;
390 struct pppol2tp_session
*ps
;
393 if (sock_flag(sk
, SOCK_DEAD
) || !(sk
->sk_state
& PPPOX_CONNECTED
))
396 /* Get session and tunnel contexts from the socket */
397 session
= pppol2tp_sock_to_session(sk
);
401 ps
= l2tp_session_priv(session
);
402 sk_tun
= ps
->tunnel_sock
;
405 tunnel
= l2tp_sock_to_tunnel(sk_tun
);
409 uhlen
= (tunnel
->encap
== L2TP_ENCAPTYPE_UDP
) ? sizeof(struct udphdr
) : 0;
410 headroom
= NET_SKB_PAD
+
411 sizeof(struct iphdr
) + /* IP header */
412 uhlen
+ /* UDP header (if L2TP_ENCAPTYPE_UDP) */
413 session
->hdr_len
+ /* L2TP header */
414 sizeof(ppph
); /* PPP header */
415 if (skb_cow_head(skb
, headroom
))
416 goto abort_put_sess_tun
;
418 /* Setup PPP header */
419 __skb_push(skb
, sizeof(ppph
));
420 skb
->data
[0] = ppph
[0];
421 skb
->data
[1] = ppph
[1];
423 l2tp_xmit_skb(session
, skb
, session
->hdr_len
);
434 /* Free the original skb */
439 /*****************************************************************************
440 * Session (and tunnel control) socket create/destroy.
441 *****************************************************************************/
443 /* Called by l2tp_core when a session socket is being closed.
445 static void pppol2tp_session_close(struct l2tp_session
*session
)
447 struct pppol2tp_session
*ps
= l2tp_session_priv(session
);
448 struct sock
*sk
= ps
->sock
;
451 BUG_ON(session
->magic
!= L2TP_SESSION_MAGIC
);
453 if (session
->session_id
== 0)
459 if (sk
->sk_state
& (PPPOX_CONNECTED
| PPPOX_BOUND
)) {
460 pppox_unbind_sock(sk
);
461 sk
->sk_state
= PPPOX_DEAD
;
462 sk
->sk_state_change(sk
);
465 /* Purge any queued data */
466 skb_queue_purge(&sk
->sk_receive_queue
);
467 skb_queue_purge(&sk
->sk_write_queue
);
468 while ((skb
= skb_dequeue(&session
->reorder_q
))) {
480 /* Really kill the session socket. (Called from sock_put() if
483 static void pppol2tp_session_destruct(struct sock
*sk
)
485 struct l2tp_session
*session
;
487 if (sk
->sk_user_data
!= NULL
) {
488 session
= sk
->sk_user_data
;
492 sk
->sk_user_data
= NULL
;
493 BUG_ON(session
->magic
!= L2TP_SESSION_MAGIC
);
494 l2tp_session_dec_refcount(session
);
501 /* Called when the PPPoX socket (session) is closed.
503 static int pppol2tp_release(struct socket
*sock
)
505 struct sock
*sk
= sock
->sk
;
506 struct l2tp_session
*session
;
514 if (sock_flag(sk
, SOCK_DEAD
) != 0)
517 pppox_unbind_sock(sk
);
519 /* Signal the death of the socket. */
520 sk
->sk_state
= PPPOX_DEAD
;
524 session
= pppol2tp_sock_to_session(sk
);
526 /* Purge any queued data */
527 skb_queue_purge(&sk
->sk_receive_queue
);
528 skb_queue_purge(&sk
->sk_write_queue
);
529 if (session
!= NULL
) {
531 while ((skb
= skb_dequeue(&session
->reorder_q
))) {
540 /* This will delete the session context via
541 * pppol2tp_session_destruct() if the socket's refcnt drops to
553 static struct proto pppol2tp_sk_proto
= {
555 .owner
= THIS_MODULE
,
556 .obj_size
= sizeof(struct pppox_sock
),
559 static int pppol2tp_backlog_recv(struct sock
*sk
, struct sk_buff
*skb
)
563 rc
= l2tp_udp_encap_recv(sk
, skb
);
567 return NET_RX_SUCCESS
;
570 /* socket() handler. Initialize a new struct sock.
572 static int pppol2tp_create(struct net
*net
, struct socket
*sock
)
577 sk
= sk_alloc(net
, PF_PPPOX
, GFP_KERNEL
, &pppol2tp_sk_proto
);
581 sock_init_data(sock
, sk
);
583 sock
->state
= SS_UNCONNECTED
;
584 sock
->ops
= &pppol2tp_ops
;
586 sk
->sk_backlog_rcv
= pppol2tp_backlog_recv
;
587 sk
->sk_protocol
= PX_PROTO_OL2TP
;
588 sk
->sk_family
= PF_PPPOX
;
589 sk
->sk_state
= PPPOX_NONE
;
590 sk
->sk_type
= SOCK_STREAM
;
591 sk
->sk_destruct
= pppol2tp_session_destruct
;
599 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
600 static void pppol2tp_show(struct seq_file
*m
, void *arg
)
602 struct l2tp_session
*session
= arg
;
603 struct pppol2tp_session
*ps
= l2tp_session_priv(session
);
606 struct pppox_sock
*po
= pppox_sk(ps
->sock
);
608 seq_printf(m
, " interface %s\n", ppp_dev_name(&po
->chan
));
613 /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
615 static int pppol2tp_connect(struct socket
*sock
, struct sockaddr
*uservaddr
,
616 int sockaddr_len
, int flags
)
618 struct sock
*sk
= sock
->sk
;
619 struct sockaddr_pppol2tp
*sp
= (struct sockaddr_pppol2tp
*) uservaddr
;
620 struct pppox_sock
*po
= pppox_sk(sk
);
621 struct l2tp_session
*session
= NULL
;
622 struct l2tp_tunnel
*tunnel
;
623 struct pppol2tp_session
*ps
;
624 struct dst_entry
*dst
;
625 struct l2tp_session_cfg cfg
= { 0, };
627 u32 tunnel_id
, peer_tunnel_id
;
628 u32 session_id
, peer_session_id
;
635 if (sp
->sa_protocol
!= PX_PROTO_OL2TP
)
638 /* Check for already bound sockets */
640 if (sk
->sk_state
& PPPOX_CONNECTED
)
643 /* We don't supporting rebinding anyway */
645 if (sk
->sk_user_data
)
646 goto end
; /* socket is already attached */
648 /* Get params from socket address. Handle L2TPv2 and L2TPv3.
649 * This is nasty because there are different sockaddr_pppol2tp
650 * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use
651 * the sockaddr size to determine which structure the caller
655 if (sockaddr_len
== sizeof(struct sockaddr_pppol2tp
)) {
656 fd
= sp
->pppol2tp
.fd
;
657 tunnel_id
= sp
->pppol2tp
.s_tunnel
;
658 peer_tunnel_id
= sp
->pppol2tp
.d_tunnel
;
659 session_id
= sp
->pppol2tp
.s_session
;
660 peer_session_id
= sp
->pppol2tp
.d_session
;
661 } else if (sockaddr_len
== sizeof(struct sockaddr_pppol2tpv3
)) {
662 struct sockaddr_pppol2tpv3
*sp3
=
663 (struct sockaddr_pppol2tpv3
*) sp
;
665 fd
= sp3
->pppol2tp
.fd
;
666 tunnel_id
= sp3
->pppol2tp
.s_tunnel
;
667 peer_tunnel_id
= sp3
->pppol2tp
.d_tunnel
;
668 session_id
= sp3
->pppol2tp
.s_session
;
669 peer_session_id
= sp3
->pppol2tp
.d_session
;
670 } else if (sockaddr_len
== sizeof(struct sockaddr_pppol2tpin6
)) {
671 struct sockaddr_pppol2tpin6
*sp6
=
672 (struct sockaddr_pppol2tpin6
*) sp
;
673 fd
= sp6
->pppol2tp
.fd
;
674 tunnel_id
= sp6
->pppol2tp
.s_tunnel
;
675 peer_tunnel_id
= sp6
->pppol2tp
.d_tunnel
;
676 session_id
= sp6
->pppol2tp
.s_session
;
677 peer_session_id
= sp6
->pppol2tp
.d_session
;
678 } else if (sockaddr_len
== sizeof(struct sockaddr_pppol2tpv3in6
)) {
679 struct sockaddr_pppol2tpv3in6
*sp6
=
680 (struct sockaddr_pppol2tpv3in6
*) sp
;
682 fd
= sp6
->pppol2tp
.fd
;
683 tunnel_id
= sp6
->pppol2tp
.s_tunnel
;
684 peer_tunnel_id
= sp6
->pppol2tp
.d_tunnel
;
685 session_id
= sp6
->pppol2tp
.s_session
;
686 peer_session_id
= sp6
->pppol2tp
.d_session
;
689 goto end
; /* bad socket address */
692 /* Don't bind if tunnel_id is 0 */
697 tunnel
= l2tp_tunnel_find(sock_net(sk
), tunnel_id
);
699 /* Special case: create tunnel context if session_id and
700 * peer_session_id is 0. Otherwise look up tunnel using supplied
703 if ((session_id
== 0) && (peer_session_id
== 0)) {
704 if (tunnel
== NULL
) {
705 struct l2tp_tunnel_cfg tcfg
= {
706 .encap
= L2TP_ENCAPTYPE_UDP
,
709 error
= l2tp_tunnel_create(sock_net(sk
), fd
, ver
, tunnel_id
, peer_tunnel_id
, &tcfg
, &tunnel
);
714 /* Error if we can't find the tunnel */
719 /* Error if socket is not prepped */
720 if (tunnel
->sock
== NULL
)
724 if (tunnel
->recv_payload_hook
== NULL
)
725 tunnel
->recv_payload_hook
= pppol2tp_recv_payload_hook
;
727 if (tunnel
->peer_tunnel_id
== 0)
728 tunnel
->peer_tunnel_id
= peer_tunnel_id
;
730 /* Create session if it doesn't already exist. We handle the
731 * case where a session was previously created by the netlink
732 * interface by checking that the session doesn't already have
733 * a socket and its tunnel socket are what we expect. If any
734 * of those checks fail, return EEXIST to the caller.
736 session
= l2tp_session_find(sock_net(sk
), tunnel
, session_id
);
737 if (session
== NULL
) {
738 /* Default MTU must allow space for UDP/L2TP/PPP
741 cfg
.mtu
= cfg
.mru
= 1500 - PPPOL2TP_HEADER_OVERHEAD
;
743 /* Allocate and initialize a new session context. */
744 session
= l2tp_session_create(sizeof(struct pppol2tp_session
),
746 peer_session_id
, &cfg
);
747 if (session
== NULL
) {
752 ps
= l2tp_session_priv(session
);
754 if (ps
->sock
!= NULL
)
757 /* consistency checks */
758 if (ps
->tunnel_sock
!= tunnel
->sock
)
762 /* Associate session with its PPPoL2TP socket */
763 ps
= l2tp_session_priv(session
);
764 ps
->owner
= current
->pid
;
766 ps
->tunnel_sock
= tunnel
->sock
;
768 session
->recv_skb
= pppol2tp_recv
;
769 session
->session_close
= pppol2tp_session_close
;
770 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
771 session
->show
= pppol2tp_show
;
774 /* We need to know each time a skb is dropped from the reorder
777 session
->ref
= pppol2tp_session_sock_hold
;
778 session
->deref
= pppol2tp_session_sock_put
;
780 /* If PMTU discovery was enabled, use the MTU that was discovered */
781 dst
= sk_dst_get(sk
);
783 u32 pmtu
= dst_mtu(__sk_dst_get(sk
));
785 session
->mtu
= session
->mru
= pmtu
-
786 PPPOL2TP_HEADER_OVERHEAD
;
790 /* Special case: if source & dest session_id == 0x0000, this
791 * socket is being created to manage the tunnel. Just set up
792 * the internal context for use by ioctl() and sockopt()
795 if ((session
->session_id
== 0) &&
796 (session
->peer_session_id
== 0)) {
801 /* The only header we need to worry about is the L2TP
802 * header. This size is different depending on whether
803 * sequence numbers are enabled for the data channel.
805 po
->chan
.hdrlen
= PPPOL2TP_L2TP_HDR_SIZE_NOSEQ
;
807 po
->chan
.private = sk
;
808 po
->chan
.ops
= &pppol2tp_chan_ops
;
809 po
->chan
.mtu
= session
->mtu
;
811 error
= ppp_register_net_channel(sock_net(sk
), &po
->chan
);
816 /* This is how we get the session context from the socket. */
817 sk
->sk_user_data
= session
;
818 sk
->sk_state
= PPPOX_CONNECTED
;
819 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
, "%s: created\n",
828 #ifdef CONFIG_L2TP_V3
830 /* Called when creating sessions via the netlink interface.
832 static int pppol2tp_session_create(struct net
*net
, u32 tunnel_id
, u32 session_id
, u32 peer_session_id
, struct l2tp_session_cfg
*cfg
)
835 struct l2tp_tunnel
*tunnel
;
836 struct l2tp_session
*session
;
837 struct pppol2tp_session
*ps
;
839 tunnel
= l2tp_tunnel_find(net
, tunnel_id
);
841 /* Error if we can't find the tunnel */
846 /* Error if tunnel socket is not prepped */
847 if (tunnel
->sock
== NULL
)
850 /* Check that this session doesn't already exist */
852 session
= l2tp_session_find(net
, tunnel
, session_id
);
856 /* Default MTU values. */
858 cfg
->mtu
= 1500 - PPPOL2TP_HEADER_OVERHEAD
;
862 /* Allocate and initialize a new session context. */
864 session
= l2tp_session_create(sizeof(struct pppol2tp_session
),
866 peer_session_id
, cfg
);
870 ps
= l2tp_session_priv(session
);
871 ps
->tunnel_sock
= tunnel
->sock
;
873 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
, "%s: created\n",
882 /* Called when deleting sessions via the netlink interface.
884 static int pppol2tp_session_delete(struct l2tp_session
*session
)
886 struct pppol2tp_session
*ps
= l2tp_session_priv(session
);
888 if (ps
->sock
== NULL
)
889 l2tp_session_dec_refcount(session
);
894 #endif /* CONFIG_L2TP_V3 */
896 /* getname() support.
898 static int pppol2tp_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
899 int *usockaddr_len
, int peer
)
903 struct l2tp_session
*session
;
904 struct l2tp_tunnel
*tunnel
;
905 struct sock
*sk
= sock
->sk
;
906 struct inet_sock
*inet
;
907 struct pppol2tp_session
*pls
;
912 if (sk
->sk_state
!= PPPOX_CONNECTED
)
916 session
= pppol2tp_sock_to_session(sk
);
920 pls
= l2tp_session_priv(session
);
921 tunnel
= l2tp_sock_to_tunnel(pls
->tunnel_sock
);
922 if (tunnel
== NULL
) {
927 inet
= inet_sk(tunnel
->sock
);
928 if ((tunnel
->version
== 2) && (tunnel
->sock
->sk_family
== AF_INET
)) {
929 struct sockaddr_pppol2tp sp
;
932 sp
.sa_family
= AF_PPPOX
;
933 sp
.sa_protocol
= PX_PROTO_OL2TP
;
934 sp
.pppol2tp
.fd
= tunnel
->fd
;
935 sp
.pppol2tp
.pid
= pls
->owner
;
936 sp
.pppol2tp
.s_tunnel
= tunnel
->tunnel_id
;
937 sp
.pppol2tp
.d_tunnel
= tunnel
->peer_tunnel_id
;
938 sp
.pppol2tp
.s_session
= session
->session_id
;
939 sp
.pppol2tp
.d_session
= session
->peer_session_id
;
940 sp
.pppol2tp
.addr
.sin_family
= AF_INET
;
941 sp
.pppol2tp
.addr
.sin_port
= inet
->inet_dport
;
942 sp
.pppol2tp
.addr
.sin_addr
.s_addr
= inet
->inet_daddr
;
943 memcpy(uaddr
, &sp
, len
);
944 #if IS_ENABLED(CONFIG_IPV6)
945 } else if ((tunnel
->version
== 2) &&
946 (tunnel
->sock
->sk_family
== AF_INET6
)) {
947 struct ipv6_pinfo
*np
= inet6_sk(tunnel
->sock
);
948 struct sockaddr_pppol2tpin6 sp
;
951 sp
.sa_family
= AF_PPPOX
;
952 sp
.sa_protocol
= PX_PROTO_OL2TP
;
953 sp
.pppol2tp
.fd
= tunnel
->fd
;
954 sp
.pppol2tp
.pid
= pls
->owner
;
955 sp
.pppol2tp
.s_tunnel
= tunnel
->tunnel_id
;
956 sp
.pppol2tp
.d_tunnel
= tunnel
->peer_tunnel_id
;
957 sp
.pppol2tp
.s_session
= session
->session_id
;
958 sp
.pppol2tp
.d_session
= session
->peer_session_id
;
959 sp
.pppol2tp
.addr
.sin6_family
= AF_INET6
;
960 sp
.pppol2tp
.addr
.sin6_port
= inet
->inet_dport
;
961 memcpy(&sp
.pppol2tp
.addr
.sin6_addr
, &np
->daddr
,
963 memcpy(uaddr
, &sp
, len
);
964 } else if ((tunnel
->version
== 3) &&
965 (tunnel
->sock
->sk_family
== AF_INET6
)) {
966 struct ipv6_pinfo
*np
= inet6_sk(tunnel
->sock
);
967 struct sockaddr_pppol2tpv3in6 sp
;
970 sp
.sa_family
= AF_PPPOX
;
971 sp
.sa_protocol
= PX_PROTO_OL2TP
;
972 sp
.pppol2tp
.fd
= tunnel
->fd
;
973 sp
.pppol2tp
.pid
= pls
->owner
;
974 sp
.pppol2tp
.s_tunnel
= tunnel
->tunnel_id
;
975 sp
.pppol2tp
.d_tunnel
= tunnel
->peer_tunnel_id
;
976 sp
.pppol2tp
.s_session
= session
->session_id
;
977 sp
.pppol2tp
.d_session
= session
->peer_session_id
;
978 sp
.pppol2tp
.addr
.sin6_family
= AF_INET6
;
979 sp
.pppol2tp
.addr
.sin6_port
= inet
->inet_dport
;
980 memcpy(&sp
.pppol2tp
.addr
.sin6_addr
, &np
->daddr
,
982 memcpy(uaddr
, &sp
, len
);
984 } else if (tunnel
->version
== 3) {
985 struct sockaddr_pppol2tpv3 sp
;
988 sp
.sa_family
= AF_PPPOX
;
989 sp
.sa_protocol
= PX_PROTO_OL2TP
;
990 sp
.pppol2tp
.fd
= tunnel
->fd
;
991 sp
.pppol2tp
.pid
= pls
->owner
;
992 sp
.pppol2tp
.s_tunnel
= tunnel
->tunnel_id
;
993 sp
.pppol2tp
.d_tunnel
= tunnel
->peer_tunnel_id
;
994 sp
.pppol2tp
.s_session
= session
->session_id
;
995 sp
.pppol2tp
.d_session
= session
->peer_session_id
;
996 sp
.pppol2tp
.addr
.sin_family
= AF_INET
;
997 sp
.pppol2tp
.addr
.sin_port
= inet
->inet_dport
;
998 sp
.pppol2tp
.addr
.sin_addr
.s_addr
= inet
->inet_daddr
;
999 memcpy(uaddr
, &sp
, len
);
1002 *usockaddr_len
= len
;
1004 sock_put(pls
->tunnel_sock
);
1013 /****************************************************************************
1016 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1017 * sockets. However, in order to control kernel tunnel features, we allow
1018 * userspace to create a special "tunnel" PPPoX socket which is used for
1019 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
1020 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
1022 ****************************************************************************/
1024 static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats
*dest
,
1025 struct l2tp_stats
*stats
)
1027 dest
->tx_packets
= stats
->tx_packets
;
1028 dest
->tx_bytes
= stats
->tx_bytes
;
1029 dest
->tx_errors
= stats
->tx_errors
;
1030 dest
->rx_packets
= stats
->rx_packets
;
1031 dest
->rx_bytes
= stats
->rx_bytes
;
1032 dest
->rx_seq_discards
= stats
->rx_seq_discards
;
1033 dest
->rx_oos_packets
= stats
->rx_oos_packets
;
1034 dest
->rx_errors
= stats
->rx_errors
;
1037 /* Session ioctl helper.
1039 static int pppol2tp_session_ioctl(struct l2tp_session
*session
,
1040 unsigned int cmd
, unsigned long arg
)
1045 int val
= (int) arg
;
1046 struct pppol2tp_session
*ps
= l2tp_session_priv(session
);
1047 struct l2tp_tunnel
*tunnel
= session
->tunnel
;
1048 struct pppol2tp_ioc_stats stats
;
1050 l2tp_dbg(session
, PPPOL2TP_MSG_CONTROL
,
1051 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
1052 session
->name
, cmd
, arg
);
1060 if (!(sk
->sk_state
& PPPOX_CONNECTED
))
1064 if (copy_from_user(&ifr
, (void __user
*) arg
, sizeof(struct ifreq
)))
1066 ifr
.ifr_mtu
= session
->mtu
;
1067 if (copy_to_user((void __user
*) arg
, &ifr
, sizeof(struct ifreq
)))
1070 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
, "%s: get mtu=%d\n",
1071 session
->name
, session
->mtu
);
1077 if (!(sk
->sk_state
& PPPOX_CONNECTED
))
1081 if (copy_from_user(&ifr
, (void __user
*) arg
, sizeof(struct ifreq
)))
1084 session
->mtu
= ifr
.ifr_mtu
;
1086 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
, "%s: set mtu=%d\n",
1087 session
->name
, session
->mtu
);
1093 if (!(sk
->sk_state
& PPPOX_CONNECTED
))
1097 if (put_user(session
->mru
, (int __user
*) arg
))
1100 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
, "%s: get mru=%d\n",
1101 session
->name
, session
->mru
);
1107 if (!(sk
->sk_state
& PPPOX_CONNECTED
))
1111 if (get_user(val
, (int __user
*) arg
))
1115 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
, "%s: set mru=%d\n",
1116 session
->name
, session
->mru
);
1122 if (put_user(ps
->flags
, (int __user
*) arg
))
1125 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
, "%s: get flags=%d\n",
1126 session
->name
, ps
->flags
);
1132 if (get_user(val
, (int __user
*) arg
))
1135 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
, "%s: set flags=%d\n",
1136 session
->name
, ps
->flags
);
1140 case PPPIOCGL2TPSTATS
:
1142 if (!(sk
->sk_state
& PPPOX_CONNECTED
))
1145 memset(&stats
, 0, sizeof(stats
));
1146 stats
.tunnel_id
= tunnel
->tunnel_id
;
1147 stats
.session_id
= session
->session_id
;
1148 pppol2tp_copy_stats(&stats
, &session
->stats
);
1149 if (copy_to_user((void __user
*) arg
, &stats
,
1152 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
, "%s: get L2TP stats\n",
1167 /* Tunnel ioctl helper.
1169 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1170 * specifies a session_id, the session ioctl handler is called. This allows an
1171 * application to retrieve session stats via a tunnel socket.
1173 static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel
*tunnel
,
1174 unsigned int cmd
, unsigned long arg
)
1178 struct pppol2tp_ioc_stats stats
;
1180 l2tp_dbg(tunnel
, PPPOL2TP_MSG_CONTROL
,
1181 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1182 tunnel
->name
, cmd
, arg
);
1188 case PPPIOCGL2TPSTATS
:
1190 if (!(sk
->sk_state
& PPPOX_CONNECTED
))
1193 if (copy_from_user(&stats
, (void __user
*) arg
,
1198 if (stats
.session_id
!= 0) {
1199 /* resend to session ioctl handler */
1200 struct l2tp_session
*session
=
1201 l2tp_session_find(sock_net(sk
), tunnel
, stats
.session_id
);
1202 if (session
!= NULL
)
1203 err
= pppol2tp_session_ioctl(session
, cmd
, arg
);
1209 stats
.using_ipsec
= (sk
->sk_policy
[0] || sk
->sk_policy
[1]) ? 1 : 0;
1211 pppol2tp_copy_stats(&stats
, &tunnel
->stats
);
1212 if (copy_to_user((void __user
*) arg
, &stats
, sizeof(stats
))) {
1216 l2tp_info(tunnel
, PPPOL2TP_MSG_CONTROL
, "%s: get L2TP stats\n",
1231 /* Main ioctl() handler.
1232 * Dispatch to tunnel or session helpers depending on the socket.
1234 static int pppol2tp_ioctl(struct socket
*sock
, unsigned int cmd
,
1237 struct sock
*sk
= sock
->sk
;
1238 struct l2tp_session
*session
;
1239 struct l2tp_tunnel
*tunnel
;
1240 struct pppol2tp_session
*ps
;
1247 if (sock_flag(sk
, SOCK_DEAD
) != 0)
1251 if ((sk
->sk_user_data
== NULL
) ||
1252 (!(sk
->sk_state
& (PPPOX_CONNECTED
| PPPOX_BOUND
))))
1255 /* Get session context from the socket */
1257 session
= pppol2tp_sock_to_session(sk
);
1258 if (session
== NULL
)
1261 /* Special case: if session's session_id is zero, treat ioctl as a
1264 ps
= l2tp_session_priv(session
);
1265 if ((session
->session_id
== 0) &&
1266 (session
->peer_session_id
== 0)) {
1268 tunnel
= l2tp_sock_to_tunnel(ps
->tunnel_sock
);
1272 err
= pppol2tp_tunnel_ioctl(tunnel
, cmd
, arg
);
1273 sock_put(ps
->tunnel_sock
);
1277 err
= pppol2tp_session_ioctl(session
, cmd
, arg
);
1285 /*****************************************************************************
1286 * setsockopt() / getsockopt() support.
1288 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1289 * sockets. In order to control kernel tunnel features, we allow userspace to
1290 * create a special "tunnel" PPPoX socket which is used for control only.
1291 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1292 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1293 *****************************************************************************/
1295 /* Tunnel setsockopt() helper.
1297 static int pppol2tp_tunnel_setsockopt(struct sock
*sk
,
1298 struct l2tp_tunnel
*tunnel
,
1299 int optname
, int val
)
1304 case PPPOL2TP_SO_DEBUG
:
1305 tunnel
->debug
= val
;
1306 l2tp_info(tunnel
, PPPOL2TP_MSG_CONTROL
, "%s: set debug=%x\n",
1307 tunnel
->name
, tunnel
->debug
);
1318 /* Session setsockopt helper.
1320 static int pppol2tp_session_setsockopt(struct sock
*sk
,
1321 struct l2tp_session
*session
,
1322 int optname
, int val
)
1325 struct pppol2tp_session
*ps
= l2tp_session_priv(session
);
1328 case PPPOL2TP_SO_RECVSEQ
:
1329 if ((val
!= 0) && (val
!= 1)) {
1333 session
->recv_seq
= val
? -1 : 0;
1334 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
,
1335 "%s: set recv_seq=%d\n",
1336 session
->name
, session
->recv_seq
);
1339 case PPPOL2TP_SO_SENDSEQ
:
1340 if ((val
!= 0) && (val
!= 1)) {
1344 session
->send_seq
= val
? -1 : 0;
1346 struct sock
*ssk
= ps
->sock
;
1347 struct pppox_sock
*po
= pppox_sk(ssk
);
1348 po
->chan
.hdrlen
= val
? PPPOL2TP_L2TP_HDR_SIZE_SEQ
:
1349 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ
;
1351 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
,
1352 "%s: set send_seq=%d\n",
1353 session
->name
, session
->send_seq
);
1356 case PPPOL2TP_SO_LNSMODE
:
1357 if ((val
!= 0) && (val
!= 1)) {
1361 session
->lns_mode
= val
? -1 : 0;
1362 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
,
1363 "%s: set lns_mode=%d\n",
1364 session
->name
, session
->lns_mode
);
1367 case PPPOL2TP_SO_DEBUG
:
1368 session
->debug
= val
;
1369 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
, "%s: set debug=%x\n",
1370 session
->name
, session
->debug
);
1373 case PPPOL2TP_SO_REORDERTO
:
1374 session
->reorder_timeout
= msecs_to_jiffies(val
);
1375 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
,
1376 "%s: set reorder_timeout=%d\n",
1377 session
->name
, session
->reorder_timeout
);
1388 /* Main setsockopt() entry point.
1389 * Does API checks, then calls either the tunnel or session setsockopt
1390 * handler, according to whether the PPPoL2TP socket is a for a regular
1391 * session or the special tunnel type.
1393 static int pppol2tp_setsockopt(struct socket
*sock
, int level
, int optname
,
1394 char __user
*optval
, unsigned int optlen
)
1396 struct sock
*sk
= sock
->sk
;
1397 struct l2tp_session
*session
;
1398 struct l2tp_tunnel
*tunnel
;
1399 struct pppol2tp_session
*ps
;
1403 if (level
!= SOL_PPPOL2TP
)
1404 return udp_prot
.setsockopt(sk
, level
, optname
, optval
, optlen
);
1406 if (optlen
< sizeof(int))
1409 if (get_user(val
, (int __user
*)optval
))
1413 if (sk
->sk_user_data
== NULL
)
1416 /* Get session context from the socket */
1418 session
= pppol2tp_sock_to_session(sk
);
1419 if (session
== NULL
)
1422 /* Special case: if session_id == 0x0000, treat as operation on tunnel
1424 ps
= l2tp_session_priv(session
);
1425 if ((session
->session_id
== 0) &&
1426 (session
->peer_session_id
== 0)) {
1428 tunnel
= l2tp_sock_to_tunnel(ps
->tunnel_sock
);
1432 err
= pppol2tp_tunnel_setsockopt(sk
, tunnel
, optname
, val
);
1433 sock_put(ps
->tunnel_sock
);
1435 err
= pppol2tp_session_setsockopt(sk
, session
, optname
, val
);
1445 /* Tunnel getsockopt helper. Called with sock locked.
1447 static int pppol2tp_tunnel_getsockopt(struct sock
*sk
,
1448 struct l2tp_tunnel
*tunnel
,
1449 int optname
, int *val
)
1454 case PPPOL2TP_SO_DEBUG
:
1455 *val
= tunnel
->debug
;
1456 l2tp_info(tunnel
, PPPOL2TP_MSG_CONTROL
, "%s: get debug=%x\n",
1457 tunnel
->name
, tunnel
->debug
);
1468 /* Session getsockopt helper. Called with sock locked.
1470 static int pppol2tp_session_getsockopt(struct sock
*sk
,
1471 struct l2tp_session
*session
,
1472 int optname
, int *val
)
1477 case PPPOL2TP_SO_RECVSEQ
:
1478 *val
= session
->recv_seq
;
1479 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
,
1480 "%s: get recv_seq=%d\n", session
->name
, *val
);
1483 case PPPOL2TP_SO_SENDSEQ
:
1484 *val
= session
->send_seq
;
1485 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
,
1486 "%s: get send_seq=%d\n", session
->name
, *val
);
1489 case PPPOL2TP_SO_LNSMODE
:
1490 *val
= session
->lns_mode
;
1491 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
,
1492 "%s: get lns_mode=%d\n", session
->name
, *val
);
1495 case PPPOL2TP_SO_DEBUG
:
1496 *val
= session
->debug
;
1497 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
, "%s: get debug=%d\n",
1498 session
->name
, *val
);
1501 case PPPOL2TP_SO_REORDERTO
:
1502 *val
= (int) jiffies_to_msecs(session
->reorder_timeout
);
1503 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
,
1504 "%s: get reorder_timeout=%d\n", session
->name
, *val
);
1514 /* Main getsockopt() entry point.
1515 * Does API checks, then calls either the tunnel or session getsockopt
1516 * handler, according to whether the PPPoX socket is a for a regular session
1517 * or the special tunnel type.
1519 static int pppol2tp_getsockopt(struct socket
*sock
, int level
, int optname
,
1520 char __user
*optval
, int __user
*optlen
)
1522 struct sock
*sk
= sock
->sk
;
1523 struct l2tp_session
*session
;
1524 struct l2tp_tunnel
*tunnel
;
1527 struct pppol2tp_session
*ps
;
1529 if (level
!= SOL_PPPOL2TP
)
1530 return udp_prot
.getsockopt(sk
, level
, optname
, optval
, optlen
);
1532 if (get_user(len
, optlen
))
1535 len
= min_t(unsigned int, len
, sizeof(int));
1541 if (sk
->sk_user_data
== NULL
)
1544 /* Get the session context */
1546 session
= pppol2tp_sock_to_session(sk
);
1547 if (session
== NULL
)
1550 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1551 ps
= l2tp_session_priv(session
);
1552 if ((session
->session_id
== 0) &&
1553 (session
->peer_session_id
== 0)) {
1555 tunnel
= l2tp_sock_to_tunnel(ps
->tunnel_sock
);
1559 err
= pppol2tp_tunnel_getsockopt(sk
, tunnel
, optname
, &val
);
1560 sock_put(ps
->tunnel_sock
);
1562 err
= pppol2tp_session_getsockopt(sk
, session
, optname
, &val
);
1565 if (put_user(len
, optlen
))
1568 if (copy_to_user((void __user
*) optval
, &val
, len
))
1579 /*****************************************************************************
1580 * /proc filesystem for debug
1581 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1582 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1583 *****************************************************************************/
1585 static unsigned int pppol2tp_net_id
;
1587 #ifdef CONFIG_PROC_FS
1589 struct pppol2tp_seq_data
{
1590 struct seq_net_private p
;
1591 int tunnel_idx
; /* current tunnel */
1592 int session_idx
; /* index of session within current tunnel */
1593 struct l2tp_tunnel
*tunnel
;
1594 struct l2tp_session
*session
; /* NULL means get next tunnel */
1597 static void pppol2tp_next_tunnel(struct net
*net
, struct pppol2tp_seq_data
*pd
)
1600 pd
->tunnel
= l2tp_tunnel_find_nth(net
, pd
->tunnel_idx
);
1603 if (pd
->tunnel
== NULL
)
1606 /* Ignore L2TPv3 tunnels */
1607 if (pd
->tunnel
->version
< 3)
1612 static void pppol2tp_next_session(struct net
*net
, struct pppol2tp_seq_data
*pd
)
1614 pd
->session
= l2tp_session_find_nth(pd
->tunnel
, pd
->session_idx
);
1617 if (pd
->session
== NULL
) {
1618 pd
->session_idx
= 0;
1619 pppol2tp_next_tunnel(net
, pd
);
1623 static void *pppol2tp_seq_start(struct seq_file
*m
, loff_t
*offs
)
1625 struct pppol2tp_seq_data
*pd
= SEQ_START_TOKEN
;
1632 BUG_ON(m
->private == NULL
);
1634 net
= seq_file_net(m
);
1636 if (pd
->tunnel
== NULL
)
1637 pppol2tp_next_tunnel(net
, pd
);
1639 pppol2tp_next_session(net
, pd
);
1641 /* NULL tunnel and session indicates end of list */
1642 if ((pd
->tunnel
== NULL
) && (pd
->session
== NULL
))
1649 static void *pppol2tp_seq_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
1655 static void pppol2tp_seq_stop(struct seq_file
*p
, void *v
)
1660 static void pppol2tp_seq_tunnel_show(struct seq_file
*m
, void *v
)
1662 struct l2tp_tunnel
*tunnel
= v
;
1664 seq_printf(m
, "\nTUNNEL '%s', %c %d\n",
1666 (tunnel
== tunnel
->sock
->sk_user_data
) ? 'Y' : 'N',
1667 atomic_read(&tunnel
->ref_count
) - 1);
1668 seq_printf(m
, " %08x %llu/%llu/%llu %llu/%llu/%llu\n",
1670 (unsigned long long)tunnel
->stats
.tx_packets
,
1671 (unsigned long long)tunnel
->stats
.tx_bytes
,
1672 (unsigned long long)tunnel
->stats
.tx_errors
,
1673 (unsigned long long)tunnel
->stats
.rx_packets
,
1674 (unsigned long long)tunnel
->stats
.rx_bytes
,
1675 (unsigned long long)tunnel
->stats
.rx_errors
);
1678 static void pppol2tp_seq_session_show(struct seq_file
*m
, void *v
)
1680 struct l2tp_session
*session
= v
;
1681 struct l2tp_tunnel
*tunnel
= session
->tunnel
;
1682 struct pppol2tp_session
*ps
= l2tp_session_priv(session
);
1683 struct pppox_sock
*po
= pppox_sk(ps
->sock
);
1688 struct inet_sock
*inet
= inet_sk(tunnel
->sock
);
1689 ip
= ntohl(inet
->inet_saddr
);
1690 port
= ntohs(inet
->inet_sport
);
1693 seq_printf(m
, " SESSION '%s' %08X/%d %04X/%04X -> "
1694 "%04X/%04X %d %c\n",
1695 session
->name
, ip
, port
,
1697 session
->session_id
,
1698 tunnel
->peer_tunnel_id
,
1699 session
->peer_session_id
,
1701 (session
== ps
->sock
->sk_user_data
) ?
1703 seq_printf(m
, " %d/%d/%c/%c/%s %08x %u\n",
1704 session
->mtu
, session
->mru
,
1705 session
->recv_seq
? 'R' : '-',
1706 session
->send_seq
? 'S' : '-',
1707 session
->lns_mode
? "LNS" : "LAC",
1709 jiffies_to_msecs(session
->reorder_timeout
));
1710 seq_printf(m
, " %hu/%hu %llu/%llu/%llu %llu/%llu/%llu\n",
1711 session
->nr
, session
->ns
,
1712 (unsigned long long)session
->stats
.tx_packets
,
1713 (unsigned long long)session
->stats
.tx_bytes
,
1714 (unsigned long long)session
->stats
.tx_errors
,
1715 (unsigned long long)session
->stats
.rx_packets
,
1716 (unsigned long long)session
->stats
.rx_bytes
,
1717 (unsigned long long)session
->stats
.rx_errors
);
1720 seq_printf(m
, " interface %s\n", ppp_dev_name(&po
->chan
));
1723 static int pppol2tp_seq_show(struct seq_file
*m
, void *v
)
1725 struct pppol2tp_seq_data
*pd
= v
;
1727 /* display header on line 1 */
1728 if (v
== SEQ_START_TOKEN
) {
1729 seq_puts(m
, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION
"\n");
1730 seq_puts(m
, "TUNNEL name, user-data-ok session-count\n");
1731 seq_puts(m
, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1732 seq_puts(m
, " SESSION name, addr/port src-tid/sid "
1733 "dest-tid/sid state user-data-ok\n");
1734 seq_puts(m
, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1735 seq_puts(m
, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1739 /* Show the tunnel or session context.
1741 if (pd
->session
== NULL
)
1742 pppol2tp_seq_tunnel_show(m
, pd
->tunnel
);
1744 pppol2tp_seq_session_show(m
, pd
->session
);
1750 static const struct seq_operations pppol2tp_seq_ops
= {
1751 .start
= pppol2tp_seq_start
,
1752 .next
= pppol2tp_seq_next
,
1753 .stop
= pppol2tp_seq_stop
,
1754 .show
= pppol2tp_seq_show
,
1757 /* Called when our /proc file is opened. We allocate data for use when
1758 * iterating our tunnel / session contexts and store it in the private
1759 * data of the seq_file.
1761 static int pppol2tp_proc_open(struct inode
*inode
, struct file
*file
)
1763 return seq_open_net(inode
, file
, &pppol2tp_seq_ops
,
1764 sizeof(struct pppol2tp_seq_data
));
1767 static const struct file_operations pppol2tp_proc_fops
= {
1768 .owner
= THIS_MODULE
,
1769 .open
= pppol2tp_proc_open
,
1771 .llseek
= seq_lseek
,
1772 .release
= seq_release_net
,
1775 #endif /* CONFIG_PROC_FS */
1777 /*****************************************************************************
1779 *****************************************************************************/
1781 static __net_init
int pppol2tp_init_net(struct net
*net
)
1783 struct proc_dir_entry
*pde
;
1786 pde
= proc_create("pppol2tp", S_IRUGO
, net
->proc_net
,
1787 &pppol2tp_proc_fops
);
1797 static __net_exit
void pppol2tp_exit_net(struct net
*net
)
1799 proc_net_remove(net
, "pppol2tp");
1802 static struct pernet_operations pppol2tp_net_ops
= {
1803 .init
= pppol2tp_init_net
,
1804 .exit
= pppol2tp_exit_net
,
1805 .id
= &pppol2tp_net_id
,
1808 /*****************************************************************************
1810 *****************************************************************************/
1812 static const struct proto_ops pppol2tp_ops
= {
1814 .owner
= THIS_MODULE
,
1815 .release
= pppol2tp_release
,
1816 .bind
= sock_no_bind
,
1817 .connect
= pppol2tp_connect
,
1818 .socketpair
= sock_no_socketpair
,
1819 .accept
= sock_no_accept
,
1820 .getname
= pppol2tp_getname
,
1821 .poll
= datagram_poll
,
1822 .listen
= sock_no_listen
,
1823 .shutdown
= sock_no_shutdown
,
1824 .setsockopt
= pppol2tp_setsockopt
,
1825 .getsockopt
= pppol2tp_getsockopt
,
1826 .sendmsg
= pppol2tp_sendmsg
,
1827 .recvmsg
= pppol2tp_recvmsg
,
1828 .mmap
= sock_no_mmap
,
1829 .ioctl
= pppox_ioctl
,
1832 static const struct pppox_proto pppol2tp_proto
= {
1833 .create
= pppol2tp_create
,
1834 .ioctl
= pppol2tp_ioctl
1837 #ifdef CONFIG_L2TP_V3
1839 static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops
= {
1840 .session_create
= pppol2tp_session_create
,
1841 .session_delete
= pppol2tp_session_delete
,
1844 #endif /* CONFIG_L2TP_V3 */
1846 static int __init
pppol2tp_init(void)
1850 err
= register_pernet_device(&pppol2tp_net_ops
);
1854 err
= proto_register(&pppol2tp_sk_proto
, 0);
1856 goto out_unregister_pppol2tp_pernet
;
1858 err
= register_pppox_proto(PX_PROTO_OL2TP
, &pppol2tp_proto
);
1860 goto out_unregister_pppol2tp_proto
;
1862 #ifdef CONFIG_L2TP_V3
1863 err
= l2tp_nl_register_ops(L2TP_PWTYPE_PPP
, &pppol2tp_nl_cmd_ops
);
1865 goto out_unregister_pppox
;
1868 pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION
);
1873 #ifdef CONFIG_L2TP_V3
1874 out_unregister_pppox
:
1875 unregister_pppox_proto(PX_PROTO_OL2TP
);
1877 out_unregister_pppol2tp_proto
:
1878 proto_unregister(&pppol2tp_sk_proto
);
1879 out_unregister_pppol2tp_pernet
:
1880 unregister_pernet_device(&pppol2tp_net_ops
);
1884 static void __exit
pppol2tp_exit(void)
1886 #ifdef CONFIG_L2TP_V3
1887 l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP
);
1889 unregister_pppox_proto(PX_PROTO_OL2TP
);
1890 proto_unregister(&pppol2tp_sk_proto
);
1891 unregister_pernet_device(&pppol2tp_net_ops
);
1894 module_init(pppol2tp_init
);
1895 module_exit(pppol2tp_exit
);
1897 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1898 MODULE_DESCRIPTION("PPP over L2TP over UDP");
1899 MODULE_LICENSE("GPL");
1900 MODULE_VERSION(PPPOL2TP_DRV_VERSION
);
1901 MODULE_ALIAS("pppox-proto-" __stringify(PX_PROTO_OL2TP
));