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>
100 #include <net/inet_common.h>
102 #include <asm/byteorder.h>
103 #include <linux/atomic.h>
105 #include "l2tp_core.h"
107 #define PPPOL2TP_DRV_VERSION "V2.0"
109 /* Space for UDP, L2TP and PPP headers */
110 #define PPPOL2TP_HEADER_OVERHEAD 40
112 /* Number of bytes to build transmit L2TP headers.
113 * Unfortunately the size is different depending on whether sequence numbers
116 #define PPPOL2TP_L2TP_HDR_SIZE_SEQ 10
117 #define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ 6
119 /* Private data of each session. This data lives at the end of struct
120 * l2tp_session, referenced via session->priv[].
122 struct pppol2tp_session
{
123 int owner
; /* pid that opened the socket */
125 struct sock
*sock
; /* Pointer to the session
127 struct sock
*tunnel_sock
; /* Pointer to the tunnel UDP
129 int flags
; /* accessed by PPPIOCGFLAGS.
133 static int pppol2tp_xmit(struct ppp_channel
*chan
, struct sk_buff
*skb
);
135 static const struct ppp_channel_ops pppol2tp_chan_ops
= {
136 .start_xmit
= pppol2tp_xmit
,
139 static const struct proto_ops pppol2tp_ops
;
141 /* Helpers to obtain tunnel/session contexts from sockets.
143 static inline struct l2tp_session
*pppol2tp_sock_to_session(struct sock
*sk
)
145 struct l2tp_session
*session
;
151 session
= (struct l2tp_session
*)(sk
->sk_user_data
);
152 if (session
== NULL
) {
157 BUG_ON(session
->magic
!= L2TP_SESSION_MAGIC
);
163 /*****************************************************************************
164 * Receive data handling
165 *****************************************************************************/
167 static int pppol2tp_recv_payload_hook(struct sk_buff
*skb
)
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.
174 * Note that skb->data[] isn't dereferenced from a u16 ptr here since
175 * the field may be unaligned.
177 if (!pskb_may_pull(skb
, 2))
180 if ((skb
->data
[0] == 0xff) && (skb
->data
[1] == 0x03))
186 /* Receive message. This is the recvmsg for the PPPoL2TP socket.
188 static int pppol2tp_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
189 struct msghdr
*msg
, size_t len
,
194 struct sock
*sk
= sock
->sk
;
197 if (sk
->sk_state
& PPPOX_BOUND
)
200 msg
->msg_namelen
= 0;
203 skb
= skb_recv_datagram(sk
, flags
& ~MSG_DONTWAIT
,
204 flags
& MSG_DONTWAIT
, &err
);
210 else if (len
< skb
->len
)
211 msg
->msg_flags
|= MSG_TRUNC
;
213 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, len
);
214 if (likely(err
== 0))
222 static void pppol2tp_recv(struct l2tp_session
*session
, struct sk_buff
*skb
, int data_len
)
224 struct pppol2tp_session
*ps
= l2tp_session_priv(session
);
225 struct sock
*sk
= NULL
;
227 /* If the socket is bound, send it in to PPP's input queue. Otherwise
228 * queue it on the session socket.
234 if (sk
->sk_state
& PPPOX_BOUND
) {
235 struct pppox_sock
*po
;
236 l2tp_dbg(session
, PPPOL2TP_MSG_DATA
,
237 "%s: recv %d byte data frame, passing to ppp\n",
238 session
->name
, data_len
);
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.
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
249 * - reset netfilter information as it doesn't apply
250 * to the inner packet either
257 ppp_input(&po
->chan
, skb
);
259 l2tp_info(session
, PPPOL2TP_MSG_DATA
, "%s: socket not bound\n",
262 /* Not bound. Nothing we can do, so discard. */
263 atomic_long_inc(&session
->stats
.rx_errors
);
270 l2tp_info(session
, PPPOL2TP_MSG_DATA
, "%s: no socket\n", session
->name
);
274 static void pppol2tp_session_sock_hold(struct l2tp_session
*session
)
276 struct pppol2tp_session
*ps
= l2tp_session_priv(session
);
282 static void pppol2tp_session_sock_put(struct l2tp_session
*session
)
284 struct pppol2tp_session
*ps
= l2tp_session_priv(session
);
290 /************************************************************************
292 ***********************************************************************/
294 /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here
295 * when a user application does a sendmsg() on the session socket. L2TP and
296 * PPP headers must be inserted into the user's data.
298 static int pppol2tp_sendmsg(struct kiocb
*iocb
, struct socket
*sock
, struct msghdr
*m
,
301 static const unsigned char ppph
[2] = { 0xff, 0x03 };
302 struct sock
*sk
= sock
->sk
;
305 struct l2tp_session
*session
;
306 struct l2tp_tunnel
*tunnel
;
307 struct pppol2tp_session
*ps
;
311 if (sock_flag(sk
, SOCK_DEAD
) || !(sk
->sk_state
& PPPOX_CONNECTED
))
314 /* Get session and tunnel contexts */
316 session
= pppol2tp_sock_to_session(sk
);
320 ps
= l2tp_session_priv(session
);
321 tunnel
= l2tp_sock_to_tunnel(ps
->tunnel_sock
);
325 uhlen
= (tunnel
->encap
== L2TP_ENCAPTYPE_UDP
) ? sizeof(struct udphdr
) : 0;
327 /* Allocate a socket buffer */
329 skb
= sock_wmalloc(sk
, NET_SKB_PAD
+ sizeof(struct iphdr
) +
330 uhlen
+ session
->hdr_len
+
331 sizeof(ppph
) + total_len
,
334 goto error_put_sess_tun
;
336 /* Reserve space for headers. */
337 skb_reserve(skb
, NET_SKB_PAD
);
338 skb_reset_network_header(skb
);
339 skb_reserve(skb
, sizeof(struct iphdr
));
340 skb_reset_transport_header(skb
);
341 skb_reserve(skb
, uhlen
);
344 skb
->data
[0] = ppph
[0];
345 skb
->data
[1] = ppph
[1];
348 /* Copy user data into skb */
349 error
= memcpy_fromiovec(skb_put(skb
, total_len
), m
->msg_iov
,
353 goto error_put_sess_tun
;
357 l2tp_xmit_skb(session
, skb
, session
->hdr_len
);
360 sock_put(ps
->tunnel_sock
);
366 sock_put(ps
->tunnel_sock
);
373 /* Transmit function called by generic PPP driver. Sends PPP frame
374 * over PPPoL2TP socket.
376 * This is almost the same as pppol2tp_sendmsg(), but rather than
377 * being called with a msghdr from userspace, it is called with a skb
380 * The supplied skb from ppp doesn't have enough headroom for the
381 * insertion of L2TP, UDP and IP headers so we need to allocate more
382 * headroom in the skb. This will create a cloned skb. But we must be
383 * careful in the error case because the caller will expect to free
384 * the skb it supplied, not our cloned skb. So we take care to always
385 * leave the original skb unfreed if we return an error.
387 static int pppol2tp_xmit(struct ppp_channel
*chan
, struct sk_buff
*skb
)
389 static const u8 ppph
[2] = { 0xff, 0x03 };
390 struct sock
*sk
= (struct sock
*) chan
->private;
392 struct l2tp_session
*session
;
393 struct l2tp_tunnel
*tunnel
;
394 struct pppol2tp_session
*ps
;
397 if (sock_flag(sk
, SOCK_DEAD
) || !(sk
->sk_state
& PPPOX_CONNECTED
))
400 /* Get session and tunnel contexts from the socket */
401 session
= pppol2tp_sock_to_session(sk
);
405 ps
= l2tp_session_priv(session
);
406 sk_tun
= ps
->tunnel_sock
;
409 tunnel
= l2tp_sock_to_tunnel(sk_tun
);
413 uhlen
= (tunnel
->encap
== L2TP_ENCAPTYPE_UDP
) ? sizeof(struct udphdr
) : 0;
414 headroom
= NET_SKB_PAD
+
415 sizeof(struct iphdr
) + /* IP header */
416 uhlen
+ /* UDP header (if L2TP_ENCAPTYPE_UDP) */
417 session
->hdr_len
+ /* L2TP header */
418 sizeof(ppph
); /* PPP header */
419 if (skb_cow_head(skb
, headroom
))
420 goto abort_put_sess_tun
;
422 /* Setup PPP header */
423 __skb_push(skb
, sizeof(ppph
));
424 skb
->data
[0] = ppph
[0];
425 skb
->data
[1] = ppph
[1];
428 l2tp_xmit_skb(session
, skb
, session
->hdr_len
);
440 /* Free the original skb */
445 /*****************************************************************************
446 * Session (and tunnel control) socket create/destroy.
447 *****************************************************************************/
449 /* Called by l2tp_core when a session socket is being closed.
451 static void pppol2tp_session_close(struct l2tp_session
*session
)
453 struct pppol2tp_session
*ps
= l2tp_session_priv(session
);
454 struct sock
*sk
= ps
->sock
;
455 struct socket
*sock
= sk
->sk_socket
;
457 BUG_ON(session
->magic
!= L2TP_SESSION_MAGIC
);
461 inet_shutdown(sock
, 2);
462 /* Don't let the session go away before our socket does */
463 l2tp_session_inc_refcount(session
);
468 /* Really kill the session socket. (Called from sock_put() if
471 static void pppol2tp_session_destruct(struct sock
*sk
)
473 struct l2tp_session
*session
= sk
->sk_user_data
;
475 sk
->sk_user_data
= NULL
;
476 BUG_ON(session
->magic
!= L2TP_SESSION_MAGIC
);
477 l2tp_session_dec_refcount(session
);
482 /* Called when the PPPoX socket (session) is closed.
484 static int pppol2tp_release(struct socket
*sock
)
486 struct sock
*sk
= sock
->sk
;
487 struct l2tp_session
*session
;
495 if (sock_flag(sk
, SOCK_DEAD
) != 0)
498 pppox_unbind_sock(sk
);
500 /* Signal the death of the socket. */
501 sk
->sk_state
= PPPOX_DEAD
;
505 session
= pppol2tp_sock_to_session(sk
);
507 /* Purge any queued data */
508 if (session
!= NULL
) {
509 __l2tp_session_unhash(session
);
510 l2tp_session_queue_purge(session
);
513 skb_queue_purge(&sk
->sk_receive_queue
);
514 skb_queue_purge(&sk
->sk_write_queue
);
518 /* This will delete the session context via
519 * pppol2tp_session_destruct() if the socket's refcnt drops to
531 static struct proto pppol2tp_sk_proto
= {
533 .owner
= THIS_MODULE
,
534 .obj_size
= sizeof(struct pppox_sock
),
537 static int pppol2tp_backlog_recv(struct sock
*sk
, struct sk_buff
*skb
)
541 rc
= l2tp_udp_encap_recv(sk
, skb
);
545 return NET_RX_SUCCESS
;
548 /* socket() handler. Initialize a new struct sock.
550 static int pppol2tp_create(struct net
*net
, struct socket
*sock
)
555 sk
= sk_alloc(net
, PF_PPPOX
, GFP_KERNEL
, &pppol2tp_sk_proto
);
559 sock_init_data(sock
, sk
);
561 sock
->state
= SS_UNCONNECTED
;
562 sock
->ops
= &pppol2tp_ops
;
564 sk
->sk_backlog_rcv
= pppol2tp_backlog_recv
;
565 sk
->sk_protocol
= PX_PROTO_OL2TP
;
566 sk
->sk_family
= PF_PPPOX
;
567 sk
->sk_state
= PPPOX_NONE
;
568 sk
->sk_type
= SOCK_STREAM
;
569 sk
->sk_destruct
= pppol2tp_session_destruct
;
577 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
578 static void pppol2tp_show(struct seq_file
*m
, void *arg
)
580 struct l2tp_session
*session
= arg
;
581 struct pppol2tp_session
*ps
= l2tp_session_priv(session
);
584 struct pppox_sock
*po
= pppox_sk(ps
->sock
);
586 seq_printf(m
, " interface %s\n", ppp_dev_name(&po
->chan
));
591 /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
593 static int pppol2tp_connect(struct socket
*sock
, struct sockaddr
*uservaddr
,
594 int sockaddr_len
, int flags
)
596 struct sock
*sk
= sock
->sk
;
597 struct sockaddr_pppol2tp
*sp
= (struct sockaddr_pppol2tp
*) uservaddr
;
598 struct pppox_sock
*po
= pppox_sk(sk
);
599 struct l2tp_session
*session
= NULL
;
600 struct l2tp_tunnel
*tunnel
;
601 struct pppol2tp_session
*ps
;
602 struct dst_entry
*dst
;
603 struct l2tp_session_cfg cfg
= { 0, };
605 u32 tunnel_id
, peer_tunnel_id
;
606 u32 session_id
, peer_session_id
;
613 if (sp
->sa_protocol
!= PX_PROTO_OL2TP
)
616 /* Check for already bound sockets */
618 if (sk
->sk_state
& PPPOX_CONNECTED
)
621 /* We don't supporting rebinding anyway */
623 if (sk
->sk_user_data
)
624 goto end
; /* socket is already attached */
626 /* Get params from socket address. Handle L2TPv2 and L2TPv3.
627 * This is nasty because there are different sockaddr_pppol2tp
628 * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use
629 * the sockaddr size to determine which structure the caller
633 if (sockaddr_len
== sizeof(struct sockaddr_pppol2tp
)) {
634 fd
= sp
->pppol2tp
.fd
;
635 tunnel_id
= sp
->pppol2tp
.s_tunnel
;
636 peer_tunnel_id
= sp
->pppol2tp
.d_tunnel
;
637 session_id
= sp
->pppol2tp
.s_session
;
638 peer_session_id
= sp
->pppol2tp
.d_session
;
639 } else if (sockaddr_len
== sizeof(struct sockaddr_pppol2tpv3
)) {
640 struct sockaddr_pppol2tpv3
*sp3
=
641 (struct sockaddr_pppol2tpv3
*) sp
;
643 fd
= sp3
->pppol2tp
.fd
;
644 tunnel_id
= sp3
->pppol2tp
.s_tunnel
;
645 peer_tunnel_id
= sp3
->pppol2tp
.d_tunnel
;
646 session_id
= sp3
->pppol2tp
.s_session
;
647 peer_session_id
= sp3
->pppol2tp
.d_session
;
648 } else if (sockaddr_len
== sizeof(struct sockaddr_pppol2tpin6
)) {
649 struct sockaddr_pppol2tpin6
*sp6
=
650 (struct sockaddr_pppol2tpin6
*) sp
;
651 fd
= sp6
->pppol2tp
.fd
;
652 tunnel_id
= sp6
->pppol2tp
.s_tunnel
;
653 peer_tunnel_id
= sp6
->pppol2tp
.d_tunnel
;
654 session_id
= sp6
->pppol2tp
.s_session
;
655 peer_session_id
= sp6
->pppol2tp
.d_session
;
656 } else if (sockaddr_len
== sizeof(struct sockaddr_pppol2tpv3in6
)) {
657 struct sockaddr_pppol2tpv3in6
*sp6
=
658 (struct sockaddr_pppol2tpv3in6
*) sp
;
660 fd
= sp6
->pppol2tp
.fd
;
661 tunnel_id
= sp6
->pppol2tp
.s_tunnel
;
662 peer_tunnel_id
= sp6
->pppol2tp
.d_tunnel
;
663 session_id
= sp6
->pppol2tp
.s_session
;
664 peer_session_id
= sp6
->pppol2tp
.d_session
;
667 goto end
; /* bad socket address */
670 /* Don't bind if tunnel_id is 0 */
675 tunnel
= l2tp_tunnel_find(sock_net(sk
), tunnel_id
);
677 /* Special case: create tunnel context if session_id and
678 * peer_session_id is 0. Otherwise look up tunnel using supplied
681 if ((session_id
== 0) && (peer_session_id
== 0)) {
682 if (tunnel
== NULL
) {
683 struct l2tp_tunnel_cfg tcfg
= {
684 .encap
= L2TP_ENCAPTYPE_UDP
,
687 error
= l2tp_tunnel_create(sock_net(sk
), fd
, ver
, tunnel_id
, peer_tunnel_id
, &tcfg
, &tunnel
);
692 /* Error if we can't find the tunnel */
697 /* Error if socket is not prepped */
698 if (tunnel
->sock
== NULL
)
702 if (tunnel
->recv_payload_hook
== NULL
)
703 tunnel
->recv_payload_hook
= pppol2tp_recv_payload_hook
;
705 if (tunnel
->peer_tunnel_id
== 0)
706 tunnel
->peer_tunnel_id
= peer_tunnel_id
;
708 /* Create session if it doesn't already exist. We handle the
709 * case where a session was previously created by the netlink
710 * interface by checking that the session doesn't already have
711 * a socket and its tunnel socket are what we expect. If any
712 * of those checks fail, return EEXIST to the caller.
714 session
= l2tp_session_find(sock_net(sk
), tunnel
, session_id
);
715 if (session
== NULL
) {
716 /* Default MTU must allow space for UDP/L2TP/PPP
719 cfg
.mtu
= cfg
.mru
= 1500 - PPPOL2TP_HEADER_OVERHEAD
;
721 /* Allocate and initialize a new session context. */
722 session
= l2tp_session_create(sizeof(struct pppol2tp_session
),
724 peer_session_id
, &cfg
);
725 if (session
== NULL
) {
730 ps
= l2tp_session_priv(session
);
732 if (ps
->sock
!= NULL
)
735 /* consistency checks */
736 if (ps
->tunnel_sock
!= tunnel
->sock
)
740 /* Associate session with its PPPoL2TP socket */
741 ps
= l2tp_session_priv(session
);
742 ps
->owner
= current
->pid
;
744 ps
->tunnel_sock
= tunnel
->sock
;
746 session
->recv_skb
= pppol2tp_recv
;
747 session
->session_close
= pppol2tp_session_close
;
748 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
749 session
->show
= pppol2tp_show
;
752 /* We need to know each time a skb is dropped from the reorder
755 session
->ref
= pppol2tp_session_sock_hold
;
756 session
->deref
= pppol2tp_session_sock_put
;
758 /* If PMTU discovery was enabled, use the MTU that was discovered */
759 dst
= sk_dst_get(sk
);
761 u32 pmtu
= dst_mtu(__sk_dst_get(sk
));
763 session
->mtu
= session
->mru
= pmtu
-
764 PPPOL2TP_HEADER_OVERHEAD
;
768 /* Special case: if source & dest session_id == 0x0000, this
769 * socket is being created to manage the tunnel. Just set up
770 * the internal context for use by ioctl() and sockopt()
773 if ((session
->session_id
== 0) &&
774 (session
->peer_session_id
== 0)) {
779 /* The only header we need to worry about is the L2TP
780 * header. This size is different depending on whether
781 * sequence numbers are enabled for the data channel.
783 po
->chan
.hdrlen
= PPPOL2TP_L2TP_HDR_SIZE_NOSEQ
;
785 po
->chan
.private = sk
;
786 po
->chan
.ops
= &pppol2tp_chan_ops
;
787 po
->chan
.mtu
= session
->mtu
;
789 error
= ppp_register_net_channel(sock_net(sk
), &po
->chan
);
794 /* This is how we get the session context from the socket. */
795 sk
->sk_user_data
= session
;
796 sk
->sk_state
= PPPOX_CONNECTED
;
797 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
, "%s: created\n",
806 #ifdef CONFIG_L2TP_V3
808 /* Called when creating sessions via the netlink interface.
810 static int pppol2tp_session_create(struct net
*net
, u32 tunnel_id
, u32 session_id
, u32 peer_session_id
, struct l2tp_session_cfg
*cfg
)
813 struct l2tp_tunnel
*tunnel
;
814 struct l2tp_session
*session
;
815 struct pppol2tp_session
*ps
;
817 tunnel
= l2tp_tunnel_find(net
, tunnel_id
);
819 /* Error if we can't find the tunnel */
824 /* Error if tunnel socket is not prepped */
825 if (tunnel
->sock
== NULL
)
828 /* Check that this session doesn't already exist */
830 session
= l2tp_session_find(net
, tunnel
, session_id
);
834 /* Default MTU values. */
836 cfg
->mtu
= 1500 - PPPOL2TP_HEADER_OVERHEAD
;
840 /* Allocate and initialize a new session context. */
842 session
= l2tp_session_create(sizeof(struct pppol2tp_session
),
844 peer_session_id
, cfg
);
848 ps
= l2tp_session_priv(session
);
849 ps
->tunnel_sock
= tunnel
->sock
;
851 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
, "%s: created\n",
860 #endif /* CONFIG_L2TP_V3 */
862 /* getname() support.
864 static int pppol2tp_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
865 int *usockaddr_len
, int peer
)
869 struct l2tp_session
*session
;
870 struct l2tp_tunnel
*tunnel
;
871 struct sock
*sk
= sock
->sk
;
872 struct inet_sock
*inet
;
873 struct pppol2tp_session
*pls
;
878 if (sk
->sk_state
!= PPPOX_CONNECTED
)
882 session
= pppol2tp_sock_to_session(sk
);
886 pls
= l2tp_session_priv(session
);
887 tunnel
= l2tp_sock_to_tunnel(pls
->tunnel_sock
);
888 if (tunnel
== NULL
) {
893 inet
= inet_sk(tunnel
->sock
);
894 if ((tunnel
->version
== 2) && (tunnel
->sock
->sk_family
== AF_INET
)) {
895 struct sockaddr_pppol2tp sp
;
898 sp
.sa_family
= AF_PPPOX
;
899 sp
.sa_protocol
= PX_PROTO_OL2TP
;
900 sp
.pppol2tp
.fd
= tunnel
->fd
;
901 sp
.pppol2tp
.pid
= pls
->owner
;
902 sp
.pppol2tp
.s_tunnel
= tunnel
->tunnel_id
;
903 sp
.pppol2tp
.d_tunnel
= tunnel
->peer_tunnel_id
;
904 sp
.pppol2tp
.s_session
= session
->session_id
;
905 sp
.pppol2tp
.d_session
= session
->peer_session_id
;
906 sp
.pppol2tp
.addr
.sin_family
= AF_INET
;
907 sp
.pppol2tp
.addr
.sin_port
= inet
->inet_dport
;
908 sp
.pppol2tp
.addr
.sin_addr
.s_addr
= inet
->inet_daddr
;
909 memcpy(uaddr
, &sp
, len
);
910 #if IS_ENABLED(CONFIG_IPV6)
911 } else if ((tunnel
->version
== 2) &&
912 (tunnel
->sock
->sk_family
== AF_INET6
)) {
913 struct sockaddr_pppol2tpin6 sp
;
917 sp
.sa_family
= AF_PPPOX
;
918 sp
.sa_protocol
= PX_PROTO_OL2TP
;
919 sp
.pppol2tp
.fd
= tunnel
->fd
;
920 sp
.pppol2tp
.pid
= pls
->owner
;
921 sp
.pppol2tp
.s_tunnel
= tunnel
->tunnel_id
;
922 sp
.pppol2tp
.d_tunnel
= tunnel
->peer_tunnel_id
;
923 sp
.pppol2tp
.s_session
= session
->session_id
;
924 sp
.pppol2tp
.d_session
= session
->peer_session_id
;
925 sp
.pppol2tp
.addr
.sin6_family
= AF_INET6
;
926 sp
.pppol2tp
.addr
.sin6_port
= inet
->inet_dport
;
927 memcpy(&sp
.pppol2tp
.addr
.sin6_addr
, &tunnel
->sock
->sk_v6_daddr
,
928 sizeof(tunnel
->sock
->sk_v6_daddr
));
929 memcpy(uaddr
, &sp
, len
);
930 } else if ((tunnel
->version
== 3) &&
931 (tunnel
->sock
->sk_family
== AF_INET6
)) {
932 struct sockaddr_pppol2tpv3in6 sp
;
936 sp
.sa_family
= AF_PPPOX
;
937 sp
.sa_protocol
= PX_PROTO_OL2TP
;
938 sp
.pppol2tp
.fd
= tunnel
->fd
;
939 sp
.pppol2tp
.pid
= pls
->owner
;
940 sp
.pppol2tp
.s_tunnel
= tunnel
->tunnel_id
;
941 sp
.pppol2tp
.d_tunnel
= tunnel
->peer_tunnel_id
;
942 sp
.pppol2tp
.s_session
= session
->session_id
;
943 sp
.pppol2tp
.d_session
= session
->peer_session_id
;
944 sp
.pppol2tp
.addr
.sin6_family
= AF_INET6
;
945 sp
.pppol2tp
.addr
.sin6_port
= inet
->inet_dport
;
946 memcpy(&sp
.pppol2tp
.addr
.sin6_addr
, &tunnel
->sock
->sk_v6_daddr
,
947 sizeof(tunnel
->sock
->sk_v6_daddr
));
948 memcpy(uaddr
, &sp
, len
);
950 } else if (tunnel
->version
== 3) {
951 struct sockaddr_pppol2tpv3 sp
;
954 sp
.sa_family
= AF_PPPOX
;
955 sp
.sa_protocol
= PX_PROTO_OL2TP
;
956 sp
.pppol2tp
.fd
= tunnel
->fd
;
957 sp
.pppol2tp
.pid
= pls
->owner
;
958 sp
.pppol2tp
.s_tunnel
= tunnel
->tunnel_id
;
959 sp
.pppol2tp
.d_tunnel
= tunnel
->peer_tunnel_id
;
960 sp
.pppol2tp
.s_session
= session
->session_id
;
961 sp
.pppol2tp
.d_session
= session
->peer_session_id
;
962 sp
.pppol2tp
.addr
.sin_family
= AF_INET
;
963 sp
.pppol2tp
.addr
.sin_port
= inet
->inet_dport
;
964 sp
.pppol2tp
.addr
.sin_addr
.s_addr
= inet
->inet_daddr
;
965 memcpy(uaddr
, &sp
, len
);
968 *usockaddr_len
= len
;
970 sock_put(pls
->tunnel_sock
);
979 /****************************************************************************
982 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
983 * sockets. However, in order to control kernel tunnel features, we allow
984 * userspace to create a special "tunnel" PPPoX socket which is used for
985 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
986 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
988 ****************************************************************************/
990 static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats
*dest
,
991 struct l2tp_stats
*stats
)
993 dest
->tx_packets
= atomic_long_read(&stats
->tx_packets
);
994 dest
->tx_bytes
= atomic_long_read(&stats
->tx_bytes
);
995 dest
->tx_errors
= atomic_long_read(&stats
->tx_errors
);
996 dest
->rx_packets
= atomic_long_read(&stats
->rx_packets
);
997 dest
->rx_bytes
= atomic_long_read(&stats
->rx_bytes
);
998 dest
->rx_seq_discards
= atomic_long_read(&stats
->rx_seq_discards
);
999 dest
->rx_oos_packets
= atomic_long_read(&stats
->rx_oos_packets
);
1000 dest
->rx_errors
= atomic_long_read(&stats
->rx_errors
);
1003 /* Session ioctl helper.
1005 static int pppol2tp_session_ioctl(struct l2tp_session
*session
,
1006 unsigned int cmd
, unsigned long arg
)
1011 int val
= (int) arg
;
1012 struct pppol2tp_session
*ps
= l2tp_session_priv(session
);
1013 struct l2tp_tunnel
*tunnel
= session
->tunnel
;
1014 struct pppol2tp_ioc_stats stats
;
1016 l2tp_dbg(session
, PPPOL2TP_MSG_CONTROL
,
1017 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
1018 session
->name
, cmd
, arg
);
1026 if (!(sk
->sk_state
& PPPOX_CONNECTED
))
1030 if (copy_from_user(&ifr
, (void __user
*) arg
, sizeof(struct ifreq
)))
1032 ifr
.ifr_mtu
= session
->mtu
;
1033 if (copy_to_user((void __user
*) arg
, &ifr
, sizeof(struct ifreq
)))
1036 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
, "%s: get mtu=%d\n",
1037 session
->name
, session
->mtu
);
1043 if (!(sk
->sk_state
& PPPOX_CONNECTED
))
1047 if (copy_from_user(&ifr
, (void __user
*) arg
, sizeof(struct ifreq
)))
1050 session
->mtu
= ifr
.ifr_mtu
;
1052 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
, "%s: set mtu=%d\n",
1053 session
->name
, session
->mtu
);
1059 if (!(sk
->sk_state
& PPPOX_CONNECTED
))
1063 if (put_user(session
->mru
, (int __user
*) arg
))
1066 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
, "%s: get mru=%d\n",
1067 session
->name
, session
->mru
);
1073 if (!(sk
->sk_state
& PPPOX_CONNECTED
))
1077 if (get_user(val
, (int __user
*) arg
))
1081 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
, "%s: set mru=%d\n",
1082 session
->name
, session
->mru
);
1088 if (put_user(ps
->flags
, (int __user
*) arg
))
1091 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
, "%s: get flags=%d\n",
1092 session
->name
, ps
->flags
);
1098 if (get_user(val
, (int __user
*) arg
))
1101 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
, "%s: set flags=%d\n",
1102 session
->name
, ps
->flags
);
1106 case PPPIOCGL2TPSTATS
:
1108 if (!(sk
->sk_state
& PPPOX_CONNECTED
))
1111 memset(&stats
, 0, sizeof(stats
));
1112 stats
.tunnel_id
= tunnel
->tunnel_id
;
1113 stats
.session_id
= session
->session_id
;
1114 pppol2tp_copy_stats(&stats
, &session
->stats
);
1115 if (copy_to_user((void __user
*) arg
, &stats
,
1118 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
, "%s: get L2TP stats\n",
1133 /* Tunnel ioctl helper.
1135 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1136 * specifies a session_id, the session ioctl handler is called. This allows an
1137 * application to retrieve session stats via a tunnel socket.
1139 static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel
*tunnel
,
1140 unsigned int cmd
, unsigned long arg
)
1144 struct pppol2tp_ioc_stats stats
;
1146 l2tp_dbg(tunnel
, PPPOL2TP_MSG_CONTROL
,
1147 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1148 tunnel
->name
, cmd
, arg
);
1154 case PPPIOCGL2TPSTATS
:
1156 if (!(sk
->sk_state
& PPPOX_CONNECTED
))
1159 if (copy_from_user(&stats
, (void __user
*) arg
,
1164 if (stats
.session_id
!= 0) {
1165 /* resend to session ioctl handler */
1166 struct l2tp_session
*session
=
1167 l2tp_session_find(sock_net(sk
), tunnel
, stats
.session_id
);
1168 if (session
!= NULL
)
1169 err
= pppol2tp_session_ioctl(session
, cmd
, arg
);
1175 stats
.using_ipsec
= (sk
->sk_policy
[0] || sk
->sk_policy
[1]) ? 1 : 0;
1177 pppol2tp_copy_stats(&stats
, &tunnel
->stats
);
1178 if (copy_to_user((void __user
*) arg
, &stats
, sizeof(stats
))) {
1182 l2tp_info(tunnel
, PPPOL2TP_MSG_CONTROL
, "%s: get L2TP stats\n",
1197 /* Main ioctl() handler.
1198 * Dispatch to tunnel or session helpers depending on the socket.
1200 static int pppol2tp_ioctl(struct socket
*sock
, unsigned int cmd
,
1203 struct sock
*sk
= sock
->sk
;
1204 struct l2tp_session
*session
;
1205 struct l2tp_tunnel
*tunnel
;
1206 struct pppol2tp_session
*ps
;
1213 if (sock_flag(sk
, SOCK_DEAD
) != 0)
1217 if ((sk
->sk_user_data
== NULL
) ||
1218 (!(sk
->sk_state
& (PPPOX_CONNECTED
| PPPOX_BOUND
))))
1221 /* Get session context from the socket */
1223 session
= pppol2tp_sock_to_session(sk
);
1224 if (session
== NULL
)
1227 /* Special case: if session's session_id is zero, treat ioctl as a
1230 ps
= l2tp_session_priv(session
);
1231 if ((session
->session_id
== 0) &&
1232 (session
->peer_session_id
== 0)) {
1234 tunnel
= l2tp_sock_to_tunnel(ps
->tunnel_sock
);
1238 err
= pppol2tp_tunnel_ioctl(tunnel
, cmd
, arg
);
1239 sock_put(ps
->tunnel_sock
);
1243 err
= pppol2tp_session_ioctl(session
, cmd
, arg
);
1251 /*****************************************************************************
1252 * setsockopt() / getsockopt() support.
1254 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1255 * sockets. In order to control kernel tunnel features, we allow userspace to
1256 * create a special "tunnel" PPPoX socket which is used for control only.
1257 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1258 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1259 *****************************************************************************/
1261 /* Tunnel setsockopt() helper.
1263 static int pppol2tp_tunnel_setsockopt(struct sock
*sk
,
1264 struct l2tp_tunnel
*tunnel
,
1265 int optname
, int val
)
1270 case PPPOL2TP_SO_DEBUG
:
1271 tunnel
->debug
= val
;
1272 l2tp_info(tunnel
, PPPOL2TP_MSG_CONTROL
, "%s: set debug=%x\n",
1273 tunnel
->name
, tunnel
->debug
);
1284 /* Session setsockopt helper.
1286 static int pppol2tp_session_setsockopt(struct sock
*sk
,
1287 struct l2tp_session
*session
,
1288 int optname
, int val
)
1291 struct pppol2tp_session
*ps
= l2tp_session_priv(session
);
1294 case PPPOL2TP_SO_RECVSEQ
:
1295 if ((val
!= 0) && (val
!= 1)) {
1299 session
->recv_seq
= val
? -1 : 0;
1300 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
,
1301 "%s: set recv_seq=%d\n",
1302 session
->name
, session
->recv_seq
);
1305 case PPPOL2TP_SO_SENDSEQ
:
1306 if ((val
!= 0) && (val
!= 1)) {
1310 session
->send_seq
= val
? -1 : 0;
1312 struct sock
*ssk
= ps
->sock
;
1313 struct pppox_sock
*po
= pppox_sk(ssk
);
1314 po
->chan
.hdrlen
= val
? PPPOL2TP_L2TP_HDR_SIZE_SEQ
:
1315 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ
;
1317 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
,
1318 "%s: set send_seq=%d\n",
1319 session
->name
, session
->send_seq
);
1322 case PPPOL2TP_SO_LNSMODE
:
1323 if ((val
!= 0) && (val
!= 1)) {
1327 session
->lns_mode
= val
? -1 : 0;
1328 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
,
1329 "%s: set lns_mode=%d\n",
1330 session
->name
, session
->lns_mode
);
1333 case PPPOL2TP_SO_DEBUG
:
1334 session
->debug
= val
;
1335 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
, "%s: set debug=%x\n",
1336 session
->name
, session
->debug
);
1339 case PPPOL2TP_SO_REORDERTO
:
1340 session
->reorder_timeout
= msecs_to_jiffies(val
);
1341 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
,
1342 "%s: set reorder_timeout=%d\n",
1343 session
->name
, session
->reorder_timeout
);
1354 /* Main setsockopt() entry point.
1355 * Does API checks, then calls either the tunnel or session setsockopt
1356 * handler, according to whether the PPPoL2TP socket is a for a regular
1357 * session or the special tunnel type.
1359 static int pppol2tp_setsockopt(struct socket
*sock
, int level
, int optname
,
1360 char __user
*optval
, unsigned int optlen
)
1362 struct sock
*sk
= sock
->sk
;
1363 struct l2tp_session
*session
;
1364 struct l2tp_tunnel
*tunnel
;
1365 struct pppol2tp_session
*ps
;
1369 if (level
!= SOL_PPPOL2TP
)
1370 return udp_prot
.setsockopt(sk
, level
, optname
, optval
, optlen
);
1372 if (optlen
< sizeof(int))
1375 if (get_user(val
, (int __user
*)optval
))
1379 if (sk
->sk_user_data
== NULL
)
1382 /* Get session context from the socket */
1384 session
= pppol2tp_sock_to_session(sk
);
1385 if (session
== NULL
)
1388 /* Special case: if session_id == 0x0000, treat as operation on tunnel
1390 ps
= l2tp_session_priv(session
);
1391 if ((session
->session_id
== 0) &&
1392 (session
->peer_session_id
== 0)) {
1394 tunnel
= l2tp_sock_to_tunnel(ps
->tunnel_sock
);
1398 err
= pppol2tp_tunnel_setsockopt(sk
, tunnel
, optname
, val
);
1399 sock_put(ps
->tunnel_sock
);
1401 err
= pppol2tp_session_setsockopt(sk
, session
, optname
, val
);
1411 /* Tunnel getsockopt helper. Called with sock locked.
1413 static int pppol2tp_tunnel_getsockopt(struct sock
*sk
,
1414 struct l2tp_tunnel
*tunnel
,
1415 int optname
, int *val
)
1420 case PPPOL2TP_SO_DEBUG
:
1421 *val
= tunnel
->debug
;
1422 l2tp_info(tunnel
, PPPOL2TP_MSG_CONTROL
, "%s: get debug=%x\n",
1423 tunnel
->name
, tunnel
->debug
);
1434 /* Session getsockopt helper. Called with sock locked.
1436 static int pppol2tp_session_getsockopt(struct sock
*sk
,
1437 struct l2tp_session
*session
,
1438 int optname
, int *val
)
1443 case PPPOL2TP_SO_RECVSEQ
:
1444 *val
= session
->recv_seq
;
1445 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
,
1446 "%s: get recv_seq=%d\n", session
->name
, *val
);
1449 case PPPOL2TP_SO_SENDSEQ
:
1450 *val
= session
->send_seq
;
1451 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
,
1452 "%s: get send_seq=%d\n", session
->name
, *val
);
1455 case PPPOL2TP_SO_LNSMODE
:
1456 *val
= session
->lns_mode
;
1457 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
,
1458 "%s: get lns_mode=%d\n", session
->name
, *val
);
1461 case PPPOL2TP_SO_DEBUG
:
1462 *val
= session
->debug
;
1463 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
, "%s: get debug=%d\n",
1464 session
->name
, *val
);
1467 case PPPOL2TP_SO_REORDERTO
:
1468 *val
= (int) jiffies_to_msecs(session
->reorder_timeout
);
1469 l2tp_info(session
, PPPOL2TP_MSG_CONTROL
,
1470 "%s: get reorder_timeout=%d\n", session
->name
, *val
);
1480 /* Main getsockopt() entry point.
1481 * Does API checks, then calls either the tunnel or session getsockopt
1482 * handler, according to whether the PPPoX socket is a for a regular session
1483 * or the special tunnel type.
1485 static int pppol2tp_getsockopt(struct socket
*sock
, int level
, int optname
,
1486 char __user
*optval
, int __user
*optlen
)
1488 struct sock
*sk
= sock
->sk
;
1489 struct l2tp_session
*session
;
1490 struct l2tp_tunnel
*tunnel
;
1493 struct pppol2tp_session
*ps
;
1495 if (level
!= SOL_PPPOL2TP
)
1496 return udp_prot
.getsockopt(sk
, level
, optname
, optval
, optlen
);
1498 if (get_user(len
, optlen
))
1501 len
= min_t(unsigned int, len
, sizeof(int));
1507 if (sk
->sk_user_data
== NULL
)
1510 /* Get the session context */
1512 session
= pppol2tp_sock_to_session(sk
);
1513 if (session
== NULL
)
1516 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1517 ps
= l2tp_session_priv(session
);
1518 if ((session
->session_id
== 0) &&
1519 (session
->peer_session_id
== 0)) {
1521 tunnel
= l2tp_sock_to_tunnel(ps
->tunnel_sock
);
1525 err
= pppol2tp_tunnel_getsockopt(sk
, tunnel
, optname
, &val
);
1526 sock_put(ps
->tunnel_sock
);
1528 err
= pppol2tp_session_getsockopt(sk
, session
, optname
, &val
);
1531 if (put_user(len
, optlen
))
1534 if (copy_to_user((void __user
*) optval
, &val
, len
))
1545 /*****************************************************************************
1546 * /proc filesystem for debug
1547 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1548 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1549 *****************************************************************************/
1551 static unsigned int pppol2tp_net_id
;
1553 #ifdef CONFIG_PROC_FS
1555 struct pppol2tp_seq_data
{
1556 struct seq_net_private p
;
1557 int tunnel_idx
; /* current tunnel */
1558 int session_idx
; /* index of session within current tunnel */
1559 struct l2tp_tunnel
*tunnel
;
1560 struct l2tp_session
*session
; /* NULL means get next tunnel */
1563 static void pppol2tp_next_tunnel(struct net
*net
, struct pppol2tp_seq_data
*pd
)
1566 pd
->tunnel
= l2tp_tunnel_find_nth(net
, pd
->tunnel_idx
);
1569 if (pd
->tunnel
== NULL
)
1572 /* Ignore L2TPv3 tunnels */
1573 if (pd
->tunnel
->version
< 3)
1578 static void pppol2tp_next_session(struct net
*net
, struct pppol2tp_seq_data
*pd
)
1580 pd
->session
= l2tp_session_find_nth(pd
->tunnel
, pd
->session_idx
);
1583 if (pd
->session
== NULL
) {
1584 pd
->session_idx
= 0;
1585 pppol2tp_next_tunnel(net
, pd
);
1589 static void *pppol2tp_seq_start(struct seq_file
*m
, loff_t
*offs
)
1591 struct pppol2tp_seq_data
*pd
= SEQ_START_TOKEN
;
1598 BUG_ON(m
->private == NULL
);
1600 net
= seq_file_net(m
);
1602 if (pd
->tunnel
== NULL
)
1603 pppol2tp_next_tunnel(net
, pd
);
1605 pppol2tp_next_session(net
, pd
);
1607 /* NULL tunnel and session indicates end of list */
1608 if ((pd
->tunnel
== NULL
) && (pd
->session
== NULL
))
1615 static void *pppol2tp_seq_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
1621 static void pppol2tp_seq_stop(struct seq_file
*p
, void *v
)
1626 static void pppol2tp_seq_tunnel_show(struct seq_file
*m
, void *v
)
1628 struct l2tp_tunnel
*tunnel
= v
;
1630 seq_printf(m
, "\nTUNNEL '%s', %c %d\n",
1632 (tunnel
== tunnel
->sock
->sk_user_data
) ? 'Y' : 'N',
1633 atomic_read(&tunnel
->ref_count
) - 1);
1634 seq_printf(m
, " %08x %ld/%ld/%ld %ld/%ld/%ld\n",
1636 atomic_long_read(&tunnel
->stats
.tx_packets
),
1637 atomic_long_read(&tunnel
->stats
.tx_bytes
),
1638 atomic_long_read(&tunnel
->stats
.tx_errors
),
1639 atomic_long_read(&tunnel
->stats
.rx_packets
),
1640 atomic_long_read(&tunnel
->stats
.rx_bytes
),
1641 atomic_long_read(&tunnel
->stats
.rx_errors
));
1644 static void pppol2tp_seq_session_show(struct seq_file
*m
, void *v
)
1646 struct l2tp_session
*session
= v
;
1647 struct l2tp_tunnel
*tunnel
= session
->tunnel
;
1648 struct pppol2tp_session
*ps
= l2tp_session_priv(session
);
1649 struct pppox_sock
*po
= pppox_sk(ps
->sock
);
1654 struct inet_sock
*inet
= inet_sk(tunnel
->sock
);
1655 ip
= ntohl(inet
->inet_saddr
);
1656 port
= ntohs(inet
->inet_sport
);
1659 seq_printf(m
, " SESSION '%s' %08X/%d %04X/%04X -> "
1660 "%04X/%04X %d %c\n",
1661 session
->name
, ip
, port
,
1663 session
->session_id
,
1664 tunnel
->peer_tunnel_id
,
1665 session
->peer_session_id
,
1667 (session
== ps
->sock
->sk_user_data
) ?
1669 seq_printf(m
, " %d/%d/%c/%c/%s %08x %u\n",
1670 session
->mtu
, session
->mru
,
1671 session
->recv_seq
? 'R' : '-',
1672 session
->send_seq
? 'S' : '-',
1673 session
->lns_mode
? "LNS" : "LAC",
1675 jiffies_to_msecs(session
->reorder_timeout
));
1676 seq_printf(m
, " %hu/%hu %ld/%ld/%ld %ld/%ld/%ld\n",
1677 session
->nr
, session
->ns
,
1678 atomic_long_read(&session
->stats
.tx_packets
),
1679 atomic_long_read(&session
->stats
.tx_bytes
),
1680 atomic_long_read(&session
->stats
.tx_errors
),
1681 atomic_long_read(&session
->stats
.rx_packets
),
1682 atomic_long_read(&session
->stats
.rx_bytes
),
1683 atomic_long_read(&session
->stats
.rx_errors
));
1686 seq_printf(m
, " interface %s\n", ppp_dev_name(&po
->chan
));
1689 static int pppol2tp_seq_show(struct seq_file
*m
, void *v
)
1691 struct pppol2tp_seq_data
*pd
= v
;
1693 /* display header on line 1 */
1694 if (v
== SEQ_START_TOKEN
) {
1695 seq_puts(m
, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION
"\n");
1696 seq_puts(m
, "TUNNEL name, user-data-ok session-count\n");
1697 seq_puts(m
, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1698 seq_puts(m
, " SESSION name, addr/port src-tid/sid "
1699 "dest-tid/sid state user-data-ok\n");
1700 seq_puts(m
, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1701 seq_puts(m
, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1705 /* Show the tunnel or session context.
1707 if (pd
->session
== NULL
)
1708 pppol2tp_seq_tunnel_show(m
, pd
->tunnel
);
1710 pppol2tp_seq_session_show(m
, pd
->session
);
1716 static const struct seq_operations pppol2tp_seq_ops
= {
1717 .start
= pppol2tp_seq_start
,
1718 .next
= pppol2tp_seq_next
,
1719 .stop
= pppol2tp_seq_stop
,
1720 .show
= pppol2tp_seq_show
,
1723 /* Called when our /proc file is opened. We allocate data for use when
1724 * iterating our tunnel / session contexts and store it in the private
1725 * data of the seq_file.
1727 static int pppol2tp_proc_open(struct inode
*inode
, struct file
*file
)
1729 return seq_open_net(inode
, file
, &pppol2tp_seq_ops
,
1730 sizeof(struct pppol2tp_seq_data
));
1733 static const struct file_operations pppol2tp_proc_fops
= {
1734 .owner
= THIS_MODULE
,
1735 .open
= pppol2tp_proc_open
,
1737 .llseek
= seq_lseek
,
1738 .release
= seq_release_net
,
1741 #endif /* CONFIG_PROC_FS */
1743 /*****************************************************************************
1745 *****************************************************************************/
1747 static __net_init
int pppol2tp_init_net(struct net
*net
)
1749 struct proc_dir_entry
*pde
;
1752 pde
= proc_create("pppol2tp", S_IRUGO
, net
->proc_net
,
1753 &pppol2tp_proc_fops
);
1763 static __net_exit
void pppol2tp_exit_net(struct net
*net
)
1765 remove_proc_entry("pppol2tp", net
->proc_net
);
1768 static struct pernet_operations pppol2tp_net_ops
= {
1769 .init
= pppol2tp_init_net
,
1770 .exit
= pppol2tp_exit_net
,
1771 .id
= &pppol2tp_net_id
,
1774 /*****************************************************************************
1776 *****************************************************************************/
1778 static const struct proto_ops pppol2tp_ops
= {
1780 .owner
= THIS_MODULE
,
1781 .release
= pppol2tp_release
,
1782 .bind
= sock_no_bind
,
1783 .connect
= pppol2tp_connect
,
1784 .socketpair
= sock_no_socketpair
,
1785 .accept
= sock_no_accept
,
1786 .getname
= pppol2tp_getname
,
1787 .poll
= datagram_poll
,
1788 .listen
= sock_no_listen
,
1789 .shutdown
= sock_no_shutdown
,
1790 .setsockopt
= pppol2tp_setsockopt
,
1791 .getsockopt
= pppol2tp_getsockopt
,
1792 .sendmsg
= pppol2tp_sendmsg
,
1793 .recvmsg
= pppol2tp_recvmsg
,
1794 .mmap
= sock_no_mmap
,
1795 .ioctl
= pppox_ioctl
,
1798 static const struct pppox_proto pppol2tp_proto
= {
1799 .create
= pppol2tp_create
,
1800 .ioctl
= pppol2tp_ioctl
,
1801 .owner
= THIS_MODULE
,
1804 #ifdef CONFIG_L2TP_V3
1806 static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops
= {
1807 .session_create
= pppol2tp_session_create
,
1808 .session_delete
= l2tp_session_delete
,
1811 #endif /* CONFIG_L2TP_V3 */
1813 static int __init
pppol2tp_init(void)
1817 err
= register_pernet_device(&pppol2tp_net_ops
);
1821 err
= proto_register(&pppol2tp_sk_proto
, 0);
1823 goto out_unregister_pppol2tp_pernet
;
1825 err
= register_pppox_proto(PX_PROTO_OL2TP
, &pppol2tp_proto
);
1827 goto out_unregister_pppol2tp_proto
;
1829 #ifdef CONFIG_L2TP_V3
1830 err
= l2tp_nl_register_ops(L2TP_PWTYPE_PPP
, &pppol2tp_nl_cmd_ops
);
1832 goto out_unregister_pppox
;
1835 pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION
);
1840 #ifdef CONFIG_L2TP_V3
1841 out_unregister_pppox
:
1842 unregister_pppox_proto(PX_PROTO_OL2TP
);
1844 out_unregister_pppol2tp_proto
:
1845 proto_unregister(&pppol2tp_sk_proto
);
1846 out_unregister_pppol2tp_pernet
:
1847 unregister_pernet_device(&pppol2tp_net_ops
);
1851 static void __exit
pppol2tp_exit(void)
1853 #ifdef CONFIG_L2TP_V3
1854 l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP
);
1856 unregister_pppox_proto(PX_PROTO_OL2TP
);
1857 proto_unregister(&pppol2tp_sk_proto
);
1858 unregister_pernet_device(&pppol2tp_net_ops
);
1861 module_init(pppol2tp_init
);
1862 module_exit(pppol2tp_exit
);
1864 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1865 MODULE_DESCRIPTION("PPP over L2TP over UDP");
1866 MODULE_LICENSE("GPL");
1867 MODULE_VERSION(PPPOL2TP_DRV_VERSION
);
1868 MODULE_ALIAS("pppox-proto-" __stringify(PX_PROTO_OL2TP
));