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 mutex sk_lock
; /* Protects .sk */
126 struct sock __rcu
*sk
; /* Pointer to the session
128 struct sock
*__sk
; /* Copy of .sk, for cleanup */
129 struct rcu_head rcu
; /* For asynchronous release */
130 int flags
; /* accessed by PPPIOCGFLAGS.
134 static int pppol2tp_xmit(struct ppp_channel
*chan
, struct sk_buff
*skb
);
136 static const struct ppp_channel_ops pppol2tp_chan_ops
= {
137 .start_xmit
= pppol2tp_xmit
,
140 static const struct proto_ops pppol2tp_ops
;
142 /* Retrieves the pppol2tp socket associated to a session.
143 * A reference is held on the returned socket, so this function must be paired
146 static struct sock
*pppol2tp_session_get_sock(struct l2tp_session
*session
)
148 struct pppol2tp_session
*ps
= l2tp_session_priv(session
);
152 sk
= rcu_dereference(ps
->sk
);
160 /* Helpers to obtain tunnel/session contexts from sockets.
162 static inline struct l2tp_session
*pppol2tp_sock_to_session(struct sock
*sk
)
164 struct l2tp_session
*session
;
170 session
= (struct l2tp_session
*)(sk
->sk_user_data
);
171 if (session
== NULL
) {
176 BUG_ON(session
->magic
!= L2TP_SESSION_MAGIC
);
182 /*****************************************************************************
183 * Receive data handling
184 *****************************************************************************/
186 static int pppol2tp_recv_payload_hook(struct sk_buff
*skb
)
188 /* Skip PPP header, if present. In testing, Microsoft L2TP clients
189 * don't send the PPP header (PPP header compression enabled), but
190 * other clients can include the header. So we cope with both cases
191 * here. The PPP header is always FF03 when using L2TP.
193 * Note that skb->data[] isn't dereferenced from a u16 ptr here since
194 * the field may be unaligned.
196 if (!pskb_may_pull(skb
, 2))
199 if ((skb
->data
[0] == PPP_ALLSTATIONS
) && (skb
->data
[1] == PPP_UI
))
205 /* Receive message. This is the recvmsg for the PPPoL2TP socket.
207 static int pppol2tp_recvmsg(struct socket
*sock
, struct msghdr
*msg
,
208 size_t len
, int flags
)
212 struct sock
*sk
= sock
->sk
;
215 if (sk
->sk_state
& PPPOX_BOUND
)
219 skb
= skb_recv_datagram(sk
, flags
& ~MSG_DONTWAIT
,
220 flags
& MSG_DONTWAIT
, &err
);
226 else if (len
< skb
->len
)
227 msg
->msg_flags
|= MSG_TRUNC
;
229 err
= skb_copy_datagram_msg(skb
, 0, msg
, len
);
230 if (likely(err
== 0))
238 static void pppol2tp_recv(struct l2tp_session
*session
, struct sk_buff
*skb
, int data_len
)
240 struct pppol2tp_session
*ps
= l2tp_session_priv(session
);
241 struct sock
*sk
= NULL
;
243 /* If the socket is bound, send it in to PPP's input queue. Otherwise
244 * queue it on the session socket.
247 sk
= rcu_dereference(ps
->sk
);
251 if (sk
->sk_state
& PPPOX_BOUND
) {
252 struct pppox_sock
*po
;
254 l2tp_dbg(session
, L2TP_MSG_DATA
,
255 "%s: recv %d byte data frame, passing to ppp\n",
256 session
->name
, data_len
);
259 ppp_input(&po
->chan
, skb
);
261 l2tp_dbg(session
, L2TP_MSG_DATA
,
262 "%s: recv %d byte data frame, passing to L2TP socket\n",
263 session
->name
, data_len
);
265 if (sock_queue_rcv_skb(sk
, skb
) < 0) {
266 atomic_long_inc(&session
->stats
.rx_errors
);
276 l2tp_info(session
, L2TP_MSG_DATA
, "%s: no socket\n", session
->name
);
280 /************************************************************************
282 ***********************************************************************/
284 /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here
285 * when a user application does a sendmsg() on the session socket. L2TP and
286 * PPP headers must be inserted into the user's data.
288 static int pppol2tp_sendmsg(struct socket
*sock
, struct msghdr
*m
,
291 struct sock
*sk
= sock
->sk
;
294 struct l2tp_session
*session
;
295 struct l2tp_tunnel
*tunnel
;
299 if (sock_flag(sk
, SOCK_DEAD
) || !(sk
->sk_state
& PPPOX_CONNECTED
))
302 /* Get session and tunnel contexts */
304 session
= pppol2tp_sock_to_session(sk
);
308 tunnel
= session
->tunnel
;
310 uhlen
= (tunnel
->encap
== L2TP_ENCAPTYPE_UDP
) ? sizeof(struct udphdr
) : 0;
312 /* Allocate a socket buffer */
314 skb
= sock_wmalloc(sk
, NET_SKB_PAD
+ sizeof(struct iphdr
) +
315 uhlen
+ session
->hdr_len
+
316 2 + total_len
, /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */
321 /* Reserve space for headers. */
322 skb_reserve(skb
, NET_SKB_PAD
);
323 skb_reset_network_header(skb
);
324 skb_reserve(skb
, sizeof(struct iphdr
));
325 skb_reset_transport_header(skb
);
326 skb_reserve(skb
, uhlen
);
329 skb
->data
[0] = PPP_ALLSTATIONS
;
330 skb
->data
[1] = PPP_UI
;
333 /* Copy user data into skb */
334 error
= memcpy_from_msg(skb_put(skb
, total_len
), m
, total_len
);
341 l2tp_xmit_skb(session
, skb
, session
->hdr_len
);
354 /* Transmit function called by generic PPP driver. Sends PPP frame
355 * over PPPoL2TP socket.
357 * This is almost the same as pppol2tp_sendmsg(), but rather than
358 * being called with a msghdr from userspace, it is called with a skb
361 * The supplied skb from ppp doesn't have enough headroom for the
362 * insertion of L2TP, UDP and IP headers so we need to allocate more
363 * headroom in the skb. This will create a cloned skb. But we must be
364 * careful in the error case because the caller will expect to free
365 * the skb it supplied, not our cloned skb. So we take care to always
366 * leave the original skb unfreed if we return an error.
368 static int pppol2tp_xmit(struct ppp_channel
*chan
, struct sk_buff
*skb
)
370 struct sock
*sk
= (struct sock
*) chan
->private;
371 struct l2tp_session
*session
;
372 struct l2tp_tunnel
*tunnel
;
375 if (sock_flag(sk
, SOCK_DEAD
) || !(sk
->sk_state
& PPPOX_CONNECTED
))
378 /* Get session and tunnel contexts from the socket */
379 session
= pppol2tp_sock_to_session(sk
);
383 tunnel
= session
->tunnel
;
385 uhlen
= (tunnel
->encap
== L2TP_ENCAPTYPE_UDP
) ? sizeof(struct udphdr
) : 0;
386 headroom
= NET_SKB_PAD
+
387 sizeof(struct iphdr
) + /* IP header */
388 uhlen
+ /* UDP header (if L2TP_ENCAPTYPE_UDP) */
389 session
->hdr_len
+ /* L2TP header */
390 2; /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */
391 if (skb_cow_head(skb
, headroom
))
394 /* Setup PPP header */
396 skb
->data
[0] = PPP_ALLSTATIONS
;
397 skb
->data
[1] = PPP_UI
;
400 l2tp_xmit_skb(session
, skb
, session
->hdr_len
);
410 /* Free the original skb */
415 /*****************************************************************************
416 * Session (and tunnel control) socket create/destroy.
417 *****************************************************************************/
419 /* Called by l2tp_core when a session socket is being closed.
421 static void pppol2tp_session_close(struct l2tp_session
*session
)
425 BUG_ON(session
->magic
!= L2TP_SESSION_MAGIC
);
427 sk
= pppol2tp_session_get_sock(session
);
430 inet_shutdown(sk
->sk_socket
, SEND_SHUTDOWN
);
435 /* Really kill the session socket. (Called from sock_put() if
438 static void pppol2tp_session_destruct(struct sock
*sk
)
440 struct l2tp_session
*session
= sk
->sk_user_data
;
442 skb_queue_purge(&sk
->sk_receive_queue
);
443 skb_queue_purge(&sk
->sk_write_queue
);
446 sk
->sk_user_data
= NULL
;
447 BUG_ON(session
->magic
!= L2TP_SESSION_MAGIC
);
448 l2tp_session_dec_refcount(session
);
452 static void pppol2tp_put_sk(struct rcu_head
*head
)
454 struct pppol2tp_session
*ps
;
456 ps
= container_of(head
, typeof(*ps
), rcu
);
460 /* Called when the PPPoX socket (session) is closed.
462 static int pppol2tp_release(struct socket
*sock
)
464 struct sock
*sk
= sock
->sk
;
465 struct l2tp_session
*session
;
473 if (sock_flag(sk
, SOCK_DEAD
) != 0)
476 pppox_unbind_sock(sk
);
478 /* Signal the death of the socket. */
479 sk
->sk_state
= PPPOX_DEAD
;
483 session
= pppol2tp_sock_to_session(sk
);
485 if (session
!= NULL
) {
486 struct pppol2tp_session
*ps
;
488 l2tp_session_delete(session
);
490 ps
= l2tp_session_priv(session
);
491 mutex_lock(&ps
->sk_lock
);
492 ps
->__sk
= rcu_dereference_protected(ps
->sk
,
493 lockdep_is_held(&ps
->sk_lock
));
494 RCU_INIT_POINTER(ps
->sk
, NULL
);
495 mutex_unlock(&ps
->sk_lock
);
496 call_rcu(&ps
->rcu
, pppol2tp_put_sk
);
498 /* Rely on the sock_put() call at the end of the function for
499 * dropping the reference held by pppol2tp_sock_to_session().
500 * The last reference will be dropped by pppol2tp_put_sk().
505 /* This will delete the session context via
506 * pppol2tp_session_destruct() if the socket's refcnt drops to
518 static struct proto pppol2tp_sk_proto
= {
520 .owner
= THIS_MODULE
,
521 .obj_size
= sizeof(struct pppox_sock
),
524 static int pppol2tp_backlog_recv(struct sock
*sk
, struct sk_buff
*skb
)
528 rc
= l2tp_udp_encap_recv(sk
, skb
);
532 return NET_RX_SUCCESS
;
535 /* socket() handler. Initialize a new struct sock.
537 static int pppol2tp_create(struct net
*net
, struct socket
*sock
, int kern
)
542 sk
= sk_alloc(net
, PF_PPPOX
, GFP_KERNEL
, &pppol2tp_sk_proto
, kern
);
546 sock_init_data(sock
, sk
);
548 sock
->state
= SS_UNCONNECTED
;
549 sock
->ops
= &pppol2tp_ops
;
551 sk
->sk_backlog_rcv
= pppol2tp_backlog_recv
;
552 sk
->sk_protocol
= PX_PROTO_OL2TP
;
553 sk
->sk_family
= PF_PPPOX
;
554 sk
->sk_state
= PPPOX_NONE
;
555 sk
->sk_type
= SOCK_STREAM
;
556 sk
->sk_destruct
= pppol2tp_session_destruct
;
564 #if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
565 static void pppol2tp_show(struct seq_file
*m
, void *arg
)
567 struct l2tp_session
*session
= arg
;
570 sk
= pppol2tp_session_get_sock(session
);
572 struct pppox_sock
*po
= pppox_sk(sk
);
574 seq_printf(m
, " interface %s\n", ppp_dev_name(&po
->chan
));
580 static void pppol2tp_session_init(struct l2tp_session
*session
)
582 struct pppol2tp_session
*ps
;
583 struct dst_entry
*dst
;
585 session
->recv_skb
= pppol2tp_recv
;
586 session
->session_close
= pppol2tp_session_close
;
587 #if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
588 session
->show
= pppol2tp_show
;
591 ps
= l2tp_session_priv(session
);
592 mutex_init(&ps
->sk_lock
);
593 ps
->owner
= current
->pid
;
595 /* If PMTU discovery was enabled, use the MTU that was discovered */
596 dst
= sk_dst_get(session
->tunnel
->sock
);
598 u32 pmtu
= dst_mtu(dst
);
601 session
->mtu
= pmtu
- PPPOL2TP_HEADER_OVERHEAD
;
602 session
->mru
= pmtu
- PPPOL2TP_HEADER_OVERHEAD
;
608 /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
610 static int pppol2tp_connect(struct socket
*sock
, struct sockaddr
*uservaddr
,
611 int sockaddr_len
, int flags
)
613 struct sock
*sk
= sock
->sk
;
614 struct sockaddr_pppol2tp
*sp
= (struct sockaddr_pppol2tp
*) uservaddr
;
615 struct pppox_sock
*po
= pppox_sk(sk
);
616 struct l2tp_session
*session
= NULL
;
617 struct l2tp_tunnel
*tunnel
;
618 struct pppol2tp_session
*ps
;
619 struct l2tp_session_cfg cfg
= { 0, };
621 u32 tunnel_id
, peer_tunnel_id
;
622 u32 session_id
, peer_session_id
;
623 bool drop_refcnt
= false;
624 bool drop_tunnel
= false;
631 if (sp
->sa_protocol
!= PX_PROTO_OL2TP
)
634 /* Check for already bound sockets */
636 if (sk
->sk_state
& PPPOX_CONNECTED
)
639 /* We don't supporting rebinding anyway */
641 if (sk
->sk_user_data
)
642 goto end
; /* socket is already attached */
644 /* Get params from socket address. Handle L2TPv2 and L2TPv3.
645 * This is nasty because there are different sockaddr_pppol2tp
646 * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use
647 * the sockaddr size to determine which structure the caller
651 if (sockaddr_len
== sizeof(struct sockaddr_pppol2tp
)) {
652 fd
= sp
->pppol2tp
.fd
;
653 tunnel_id
= sp
->pppol2tp
.s_tunnel
;
654 peer_tunnel_id
= sp
->pppol2tp
.d_tunnel
;
655 session_id
= sp
->pppol2tp
.s_session
;
656 peer_session_id
= sp
->pppol2tp
.d_session
;
657 } else if (sockaddr_len
== sizeof(struct sockaddr_pppol2tpv3
)) {
658 struct sockaddr_pppol2tpv3
*sp3
=
659 (struct sockaddr_pppol2tpv3
*) sp
;
661 fd
= sp3
->pppol2tp
.fd
;
662 tunnel_id
= sp3
->pppol2tp
.s_tunnel
;
663 peer_tunnel_id
= sp3
->pppol2tp
.d_tunnel
;
664 session_id
= sp3
->pppol2tp
.s_session
;
665 peer_session_id
= sp3
->pppol2tp
.d_session
;
666 } else if (sockaddr_len
== sizeof(struct sockaddr_pppol2tpin6
)) {
667 struct sockaddr_pppol2tpin6
*sp6
=
668 (struct sockaddr_pppol2tpin6
*) sp
;
669 fd
= sp6
->pppol2tp
.fd
;
670 tunnel_id
= sp6
->pppol2tp
.s_tunnel
;
671 peer_tunnel_id
= sp6
->pppol2tp
.d_tunnel
;
672 session_id
= sp6
->pppol2tp
.s_session
;
673 peer_session_id
= sp6
->pppol2tp
.d_session
;
674 } else if (sockaddr_len
== sizeof(struct sockaddr_pppol2tpv3in6
)) {
675 struct sockaddr_pppol2tpv3in6
*sp6
=
676 (struct sockaddr_pppol2tpv3in6
*) sp
;
678 fd
= sp6
->pppol2tp
.fd
;
679 tunnel_id
= sp6
->pppol2tp
.s_tunnel
;
680 peer_tunnel_id
= sp6
->pppol2tp
.d_tunnel
;
681 session_id
= sp6
->pppol2tp
.s_session
;
682 peer_session_id
= sp6
->pppol2tp
.d_session
;
685 goto end
; /* bad socket address */
688 /* Don't bind if tunnel_id is 0 */
693 tunnel
= l2tp_tunnel_get(sock_net(sk
), tunnel_id
);
697 /* Special case: create tunnel context if session_id and
698 * peer_session_id is 0. Otherwise look up tunnel using supplied
701 if ((session_id
== 0) && (peer_session_id
== 0)) {
702 if (tunnel
== NULL
) {
703 struct l2tp_tunnel_cfg tcfg
= {
704 .encap
= L2TP_ENCAPTYPE_UDP
,
707 error
= l2tp_tunnel_create(sock_net(sk
), fd
, ver
, tunnel_id
, peer_tunnel_id
, &tcfg
, &tunnel
);
712 /* Error if we can't find the tunnel */
717 /* Error if socket is not prepped */
718 if (tunnel
->sock
== NULL
)
722 if (tunnel
->recv_payload_hook
== NULL
)
723 tunnel
->recv_payload_hook
= pppol2tp_recv_payload_hook
;
725 if (tunnel
->peer_tunnel_id
== 0)
726 tunnel
->peer_tunnel_id
= peer_tunnel_id
;
728 session
= l2tp_session_get(sock_net(sk
), tunnel
, session_id
);
731 ps
= l2tp_session_priv(session
);
733 /* Using a pre-existing session is fine as long as it hasn't
734 * been connected yet.
736 mutex_lock(&ps
->sk_lock
);
737 if (rcu_dereference_protected(ps
->sk
,
738 lockdep_is_held(&ps
->sk_lock
))) {
739 mutex_unlock(&ps
->sk_lock
);
744 /* Default MTU must allow space for UDP/L2TP/PPP headers */
745 cfg
.mtu
= 1500 - PPPOL2TP_HEADER_OVERHEAD
;
748 session
= l2tp_session_create(sizeof(struct pppol2tp_session
),
750 peer_session_id
, &cfg
);
751 if (IS_ERR(session
)) {
752 error
= PTR_ERR(session
);
756 pppol2tp_session_init(session
);
757 ps
= l2tp_session_priv(session
);
758 l2tp_session_inc_refcount(session
);
760 mutex_lock(&ps
->sk_lock
);
761 error
= l2tp_session_register(session
, tunnel
);
763 mutex_unlock(&ps
->sk_lock
);
770 /* Special case: if source & dest session_id == 0x0000, this
771 * socket is being created to manage the tunnel. Just set up
772 * the internal context for use by ioctl() and sockopt()
775 if ((session
->session_id
== 0) &&
776 (session
->peer_session_id
== 0)) {
781 /* The only header we need to worry about is the L2TP
782 * header. This size is different depending on whether
783 * sequence numbers are enabled for the data channel.
785 po
->chan
.hdrlen
= PPPOL2TP_L2TP_HDR_SIZE_NOSEQ
;
787 po
->chan
.private = sk
;
788 po
->chan
.ops
= &pppol2tp_chan_ops
;
789 po
->chan
.mtu
= session
->mtu
;
791 error
= ppp_register_net_channel(sock_net(sk
), &po
->chan
);
793 mutex_unlock(&ps
->sk_lock
);
798 /* This is how we get the session context from the socket. */
799 sk
->sk_user_data
= session
;
800 rcu_assign_pointer(ps
->sk
, sk
);
801 mutex_unlock(&ps
->sk_lock
);
803 /* Keep the reference we've grabbed on the session: sk doesn't expect
804 * the session to disappear. pppol2tp_session_destruct() is responsible
809 sk
->sk_state
= PPPOX_CONNECTED
;
810 l2tp_info(session
, L2TP_MSG_CONTROL
, "%s: created\n",
815 l2tp_session_dec_refcount(session
);
817 l2tp_tunnel_dec_refcount(tunnel
);
823 #ifdef CONFIG_L2TP_V3
825 /* Called when creating sessions via the netlink interface. */
826 static int pppol2tp_session_create(struct net
*net
, struct l2tp_tunnel
*tunnel
,
827 u32 session_id
, u32 peer_session_id
,
828 struct l2tp_session_cfg
*cfg
)
831 struct l2tp_session
*session
;
833 /* Error if tunnel socket is not prepped */
839 /* Default MTU values. */
841 cfg
->mtu
= 1500 - PPPOL2TP_HEADER_OVERHEAD
;
845 /* Allocate and initialize a new session context. */
846 session
= l2tp_session_create(sizeof(struct pppol2tp_session
),
848 peer_session_id
, cfg
);
849 if (IS_ERR(session
)) {
850 error
= PTR_ERR(session
);
854 pppol2tp_session_init(session
);
856 error
= l2tp_session_register(session
, tunnel
);
868 #endif /* CONFIG_L2TP_V3 */
870 /* getname() support.
872 static int pppol2tp_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
877 struct l2tp_session
*session
;
878 struct l2tp_tunnel
*tunnel
;
879 struct sock
*sk
= sock
->sk
;
880 struct inet_sock
*inet
;
881 struct pppol2tp_session
*pls
;
886 if (!(sk
->sk_state
& PPPOX_CONNECTED
))
890 session
= pppol2tp_sock_to_session(sk
);
894 pls
= l2tp_session_priv(session
);
895 tunnel
= session
->tunnel
;
897 inet
= inet_sk(tunnel
->sock
);
898 if ((tunnel
->version
== 2) && (tunnel
->sock
->sk_family
== AF_INET
)) {
899 struct sockaddr_pppol2tp sp
;
902 sp
.sa_family
= AF_PPPOX
;
903 sp
.sa_protocol
= PX_PROTO_OL2TP
;
904 sp
.pppol2tp
.fd
= tunnel
->fd
;
905 sp
.pppol2tp
.pid
= pls
->owner
;
906 sp
.pppol2tp
.s_tunnel
= tunnel
->tunnel_id
;
907 sp
.pppol2tp
.d_tunnel
= tunnel
->peer_tunnel_id
;
908 sp
.pppol2tp
.s_session
= session
->session_id
;
909 sp
.pppol2tp
.d_session
= session
->peer_session_id
;
910 sp
.pppol2tp
.addr
.sin_family
= AF_INET
;
911 sp
.pppol2tp
.addr
.sin_port
= inet
->inet_dport
;
912 sp
.pppol2tp
.addr
.sin_addr
.s_addr
= inet
->inet_daddr
;
913 memcpy(uaddr
, &sp
, len
);
914 #if IS_ENABLED(CONFIG_IPV6)
915 } else if ((tunnel
->version
== 2) &&
916 (tunnel
->sock
->sk_family
== AF_INET6
)) {
917 struct sockaddr_pppol2tpin6 sp
;
921 sp
.sa_family
= AF_PPPOX
;
922 sp
.sa_protocol
= PX_PROTO_OL2TP
;
923 sp
.pppol2tp
.fd
= tunnel
->fd
;
924 sp
.pppol2tp
.pid
= pls
->owner
;
925 sp
.pppol2tp
.s_tunnel
= tunnel
->tunnel_id
;
926 sp
.pppol2tp
.d_tunnel
= tunnel
->peer_tunnel_id
;
927 sp
.pppol2tp
.s_session
= session
->session_id
;
928 sp
.pppol2tp
.d_session
= session
->peer_session_id
;
929 sp
.pppol2tp
.addr
.sin6_family
= AF_INET6
;
930 sp
.pppol2tp
.addr
.sin6_port
= inet
->inet_dport
;
931 memcpy(&sp
.pppol2tp
.addr
.sin6_addr
, &tunnel
->sock
->sk_v6_daddr
,
932 sizeof(tunnel
->sock
->sk_v6_daddr
));
933 memcpy(uaddr
, &sp
, len
);
934 } else if ((tunnel
->version
== 3) &&
935 (tunnel
->sock
->sk_family
== AF_INET6
)) {
936 struct sockaddr_pppol2tpv3in6 sp
;
940 sp
.sa_family
= AF_PPPOX
;
941 sp
.sa_protocol
= PX_PROTO_OL2TP
;
942 sp
.pppol2tp
.fd
= tunnel
->fd
;
943 sp
.pppol2tp
.pid
= pls
->owner
;
944 sp
.pppol2tp
.s_tunnel
= tunnel
->tunnel_id
;
945 sp
.pppol2tp
.d_tunnel
= tunnel
->peer_tunnel_id
;
946 sp
.pppol2tp
.s_session
= session
->session_id
;
947 sp
.pppol2tp
.d_session
= session
->peer_session_id
;
948 sp
.pppol2tp
.addr
.sin6_family
= AF_INET6
;
949 sp
.pppol2tp
.addr
.sin6_port
= inet
->inet_dport
;
950 memcpy(&sp
.pppol2tp
.addr
.sin6_addr
, &tunnel
->sock
->sk_v6_daddr
,
951 sizeof(tunnel
->sock
->sk_v6_daddr
));
952 memcpy(uaddr
, &sp
, len
);
954 } else if (tunnel
->version
== 3) {
955 struct sockaddr_pppol2tpv3 sp
;
958 sp
.sa_family
= AF_PPPOX
;
959 sp
.sa_protocol
= PX_PROTO_OL2TP
;
960 sp
.pppol2tp
.fd
= tunnel
->fd
;
961 sp
.pppol2tp
.pid
= pls
->owner
;
962 sp
.pppol2tp
.s_tunnel
= tunnel
->tunnel_id
;
963 sp
.pppol2tp
.d_tunnel
= tunnel
->peer_tunnel_id
;
964 sp
.pppol2tp
.s_session
= session
->session_id
;
965 sp
.pppol2tp
.d_session
= session
->peer_session_id
;
966 sp
.pppol2tp
.addr
.sin_family
= AF_INET
;
967 sp
.pppol2tp
.addr
.sin_port
= inet
->inet_dport
;
968 sp
.pppol2tp
.addr
.sin_addr
.s_addr
= inet
->inet_daddr
;
969 memcpy(uaddr
, &sp
, len
);
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
, L2TP_MSG_CONTROL
,
1017 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
1018 session
->name
, cmd
, arg
);
1020 sk
= pppol2tp_session_get_sock(session
);
1027 if (!(sk
->sk_state
& PPPOX_CONNECTED
))
1031 if (copy_from_user(&ifr
, (void __user
*) arg
, sizeof(struct ifreq
)))
1033 ifr
.ifr_mtu
= session
->mtu
;
1034 if (copy_to_user((void __user
*) arg
, &ifr
, sizeof(struct ifreq
)))
1037 l2tp_info(session
, L2TP_MSG_CONTROL
, "%s: get mtu=%d\n",
1038 session
->name
, session
->mtu
);
1044 if (!(sk
->sk_state
& PPPOX_CONNECTED
))
1048 if (copy_from_user(&ifr
, (void __user
*) arg
, sizeof(struct ifreq
)))
1051 session
->mtu
= ifr
.ifr_mtu
;
1053 l2tp_info(session
, L2TP_MSG_CONTROL
, "%s: set mtu=%d\n",
1054 session
->name
, session
->mtu
);
1060 if (!(sk
->sk_state
& PPPOX_CONNECTED
))
1064 if (put_user(session
->mru
, (int __user
*) arg
))
1067 l2tp_info(session
, L2TP_MSG_CONTROL
, "%s: get mru=%d\n",
1068 session
->name
, session
->mru
);
1074 if (!(sk
->sk_state
& PPPOX_CONNECTED
))
1078 if (get_user(val
, (int __user
*) arg
))
1082 l2tp_info(session
, L2TP_MSG_CONTROL
, "%s: set mru=%d\n",
1083 session
->name
, session
->mru
);
1089 if (put_user(ps
->flags
, (int __user
*) arg
))
1092 l2tp_info(session
, L2TP_MSG_CONTROL
, "%s: get flags=%d\n",
1093 session
->name
, ps
->flags
);
1099 if (get_user(val
, (int __user
*) arg
))
1102 l2tp_info(session
, L2TP_MSG_CONTROL
, "%s: set flags=%d\n",
1103 session
->name
, ps
->flags
);
1107 case PPPIOCGL2TPSTATS
:
1109 if (!(sk
->sk_state
& PPPOX_CONNECTED
))
1112 memset(&stats
, 0, sizeof(stats
));
1113 stats
.tunnel_id
= tunnel
->tunnel_id
;
1114 stats
.session_id
= session
->session_id
;
1115 pppol2tp_copy_stats(&stats
, &session
->stats
);
1116 if (copy_to_user((void __user
*) arg
, &stats
,
1119 l2tp_info(session
, L2TP_MSG_CONTROL
, "%s: get L2TP stats\n",
1134 /* Tunnel ioctl helper.
1136 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1137 * specifies a session_id, the session ioctl handler is called. This allows an
1138 * application to retrieve session stats via a tunnel socket.
1140 static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel
*tunnel
,
1141 unsigned int cmd
, unsigned long arg
)
1145 struct pppol2tp_ioc_stats stats
;
1147 l2tp_dbg(tunnel
, L2TP_MSG_CONTROL
,
1148 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1149 tunnel
->name
, cmd
, arg
);
1155 case PPPIOCGL2TPSTATS
:
1157 if (!(sk
->sk_state
& PPPOX_CONNECTED
))
1160 if (copy_from_user(&stats
, (void __user
*) arg
,
1165 if (stats
.session_id
!= 0) {
1166 /* resend to session ioctl handler */
1167 struct l2tp_session
*session
=
1168 l2tp_session_get(sock_net(sk
), tunnel
,
1172 err
= pppol2tp_session_ioctl(session
, cmd
,
1174 l2tp_session_dec_refcount(session
);
1181 stats
.using_ipsec
= (sk
->sk_policy
[0] || sk
->sk_policy
[1]) ? 1 : 0;
1183 pppol2tp_copy_stats(&stats
, &tunnel
->stats
);
1184 if (copy_to_user((void __user
*) arg
, &stats
, sizeof(stats
))) {
1188 l2tp_info(tunnel
, L2TP_MSG_CONTROL
, "%s: get L2TP stats\n",
1203 /* Main ioctl() handler.
1204 * Dispatch to tunnel or session helpers depending on the socket.
1206 static int pppol2tp_ioctl(struct socket
*sock
, unsigned int cmd
,
1209 struct sock
*sk
= sock
->sk
;
1210 struct l2tp_session
*session
;
1211 struct l2tp_tunnel
*tunnel
;
1218 if (sock_flag(sk
, SOCK_DEAD
) != 0)
1222 if ((sk
->sk_user_data
== NULL
) ||
1223 (!(sk
->sk_state
& (PPPOX_CONNECTED
| PPPOX_BOUND
))))
1226 /* Get session context from the socket */
1228 session
= pppol2tp_sock_to_session(sk
);
1229 if (session
== NULL
)
1232 /* Special case: if session's session_id is zero, treat ioctl as a
1235 if ((session
->session_id
== 0) &&
1236 (session
->peer_session_id
== 0)) {
1237 tunnel
= session
->tunnel
;
1238 err
= pppol2tp_tunnel_ioctl(tunnel
, cmd
, arg
);
1242 err
= pppol2tp_session_ioctl(session
, cmd
, arg
);
1250 /*****************************************************************************
1251 * setsockopt() / getsockopt() support.
1253 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1254 * sockets. In order to control kernel tunnel features, we allow userspace to
1255 * create a special "tunnel" PPPoX socket which is used for control only.
1256 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1257 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1258 *****************************************************************************/
1260 /* Tunnel setsockopt() helper.
1262 static int pppol2tp_tunnel_setsockopt(struct sock
*sk
,
1263 struct l2tp_tunnel
*tunnel
,
1264 int optname
, int val
)
1269 case PPPOL2TP_SO_DEBUG
:
1270 tunnel
->debug
= val
;
1271 l2tp_info(tunnel
, L2TP_MSG_CONTROL
, "%s: set debug=%x\n",
1272 tunnel
->name
, tunnel
->debug
);
1283 /* Session setsockopt helper.
1285 static int pppol2tp_session_setsockopt(struct sock
*sk
,
1286 struct l2tp_session
*session
,
1287 int optname
, int val
)
1292 case PPPOL2TP_SO_RECVSEQ
:
1293 if ((val
!= 0) && (val
!= 1)) {
1297 session
->recv_seq
= !!val
;
1298 l2tp_info(session
, L2TP_MSG_CONTROL
,
1299 "%s: set recv_seq=%d\n",
1300 session
->name
, session
->recv_seq
);
1303 case PPPOL2TP_SO_SENDSEQ
:
1304 if ((val
!= 0) && (val
!= 1)) {
1308 session
->send_seq
= !!val
;
1310 struct pppox_sock
*po
= pppox_sk(sk
);
1312 po
->chan
.hdrlen
= val
? PPPOL2TP_L2TP_HDR_SIZE_SEQ
:
1313 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ
;
1315 l2tp_session_set_header_len(session
, session
->tunnel
->version
);
1316 l2tp_info(session
, L2TP_MSG_CONTROL
,
1317 "%s: set send_seq=%d\n",
1318 session
->name
, session
->send_seq
);
1321 case PPPOL2TP_SO_LNSMODE
:
1322 if ((val
!= 0) && (val
!= 1)) {
1326 session
->lns_mode
= !!val
;
1327 l2tp_info(session
, L2TP_MSG_CONTROL
,
1328 "%s: set lns_mode=%d\n",
1329 session
->name
, session
->lns_mode
);
1332 case PPPOL2TP_SO_DEBUG
:
1333 session
->debug
= val
;
1334 l2tp_info(session
, L2TP_MSG_CONTROL
, "%s: set debug=%x\n",
1335 session
->name
, session
->debug
);
1338 case PPPOL2TP_SO_REORDERTO
:
1339 session
->reorder_timeout
= msecs_to_jiffies(val
);
1340 l2tp_info(session
, L2TP_MSG_CONTROL
,
1341 "%s: set reorder_timeout=%d\n",
1342 session
->name
, session
->reorder_timeout
);
1353 /* Main setsockopt() entry point.
1354 * Does API checks, then calls either the tunnel or session setsockopt
1355 * handler, according to whether the PPPoL2TP socket is a for a regular
1356 * session or the special tunnel type.
1358 static int pppol2tp_setsockopt(struct socket
*sock
, int level
, int optname
,
1359 char __user
*optval
, unsigned int optlen
)
1361 struct sock
*sk
= sock
->sk
;
1362 struct l2tp_session
*session
;
1363 struct l2tp_tunnel
*tunnel
;
1367 if (level
!= SOL_PPPOL2TP
)
1370 if (optlen
< sizeof(int))
1373 if (get_user(val
, (int __user
*)optval
))
1377 if (sk
->sk_user_data
== NULL
)
1380 /* Get session context from the socket */
1382 session
= pppol2tp_sock_to_session(sk
);
1383 if (session
== NULL
)
1386 /* Special case: if session_id == 0x0000, treat as operation on tunnel
1388 if ((session
->session_id
== 0) &&
1389 (session
->peer_session_id
== 0)) {
1390 tunnel
= session
->tunnel
;
1391 err
= pppol2tp_tunnel_setsockopt(sk
, tunnel
, optname
, val
);
1393 err
= pppol2tp_session_setsockopt(sk
, session
, optname
, val
);
1401 /* Tunnel getsockopt helper. Called with sock locked.
1403 static int pppol2tp_tunnel_getsockopt(struct sock
*sk
,
1404 struct l2tp_tunnel
*tunnel
,
1405 int optname
, int *val
)
1410 case PPPOL2TP_SO_DEBUG
:
1411 *val
= tunnel
->debug
;
1412 l2tp_info(tunnel
, L2TP_MSG_CONTROL
, "%s: get debug=%x\n",
1413 tunnel
->name
, tunnel
->debug
);
1424 /* Session getsockopt helper. Called with sock locked.
1426 static int pppol2tp_session_getsockopt(struct sock
*sk
,
1427 struct l2tp_session
*session
,
1428 int optname
, int *val
)
1433 case PPPOL2TP_SO_RECVSEQ
:
1434 *val
= session
->recv_seq
;
1435 l2tp_info(session
, L2TP_MSG_CONTROL
,
1436 "%s: get recv_seq=%d\n", session
->name
, *val
);
1439 case PPPOL2TP_SO_SENDSEQ
:
1440 *val
= session
->send_seq
;
1441 l2tp_info(session
, L2TP_MSG_CONTROL
,
1442 "%s: get send_seq=%d\n", session
->name
, *val
);
1445 case PPPOL2TP_SO_LNSMODE
:
1446 *val
= session
->lns_mode
;
1447 l2tp_info(session
, L2TP_MSG_CONTROL
,
1448 "%s: get lns_mode=%d\n", session
->name
, *val
);
1451 case PPPOL2TP_SO_DEBUG
:
1452 *val
= session
->debug
;
1453 l2tp_info(session
, L2TP_MSG_CONTROL
, "%s: get debug=%d\n",
1454 session
->name
, *val
);
1457 case PPPOL2TP_SO_REORDERTO
:
1458 *val
= (int) jiffies_to_msecs(session
->reorder_timeout
);
1459 l2tp_info(session
, L2TP_MSG_CONTROL
,
1460 "%s: get reorder_timeout=%d\n", session
->name
, *val
);
1470 /* Main getsockopt() entry point.
1471 * Does API checks, then calls either the tunnel or session getsockopt
1472 * handler, according to whether the PPPoX socket is a for a regular session
1473 * or the special tunnel type.
1475 static int pppol2tp_getsockopt(struct socket
*sock
, int level
, int optname
,
1476 char __user
*optval
, int __user
*optlen
)
1478 struct sock
*sk
= sock
->sk
;
1479 struct l2tp_session
*session
;
1480 struct l2tp_tunnel
*tunnel
;
1484 if (level
!= SOL_PPPOL2TP
)
1487 if (get_user(len
, optlen
))
1490 len
= min_t(unsigned int, len
, sizeof(int));
1496 if (sk
->sk_user_data
== NULL
)
1499 /* Get the session context */
1501 session
= pppol2tp_sock_to_session(sk
);
1502 if (session
== NULL
)
1505 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1506 if ((session
->session_id
== 0) &&
1507 (session
->peer_session_id
== 0)) {
1508 tunnel
= session
->tunnel
;
1509 err
= pppol2tp_tunnel_getsockopt(sk
, tunnel
, optname
, &val
);
1513 err
= pppol2tp_session_getsockopt(sk
, session
, optname
, &val
);
1519 if (put_user(len
, optlen
))
1522 if (copy_to_user((void __user
*) optval
, &val
, len
))
1533 /*****************************************************************************
1534 * /proc filesystem for debug
1535 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1536 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1537 *****************************************************************************/
1539 static unsigned int pppol2tp_net_id
;
1541 #ifdef CONFIG_PROC_FS
1543 struct pppol2tp_seq_data
{
1544 struct seq_net_private p
;
1545 int tunnel_idx
; /* current tunnel */
1546 int session_idx
; /* index of session within current tunnel */
1547 struct l2tp_tunnel
*tunnel
;
1548 struct l2tp_session
*session
; /* NULL means get next tunnel */
1551 static void pppol2tp_next_tunnel(struct net
*net
, struct pppol2tp_seq_data
*pd
)
1554 pd
->tunnel
= l2tp_tunnel_find_nth(net
, pd
->tunnel_idx
);
1557 if (pd
->tunnel
== NULL
)
1560 /* Ignore L2TPv3 tunnels */
1561 if (pd
->tunnel
->version
< 3)
1566 static void pppol2tp_next_session(struct net
*net
, struct pppol2tp_seq_data
*pd
)
1568 pd
->session
= l2tp_session_get_nth(pd
->tunnel
, pd
->session_idx
);
1571 if (pd
->session
== NULL
) {
1572 pd
->session_idx
= 0;
1573 pppol2tp_next_tunnel(net
, pd
);
1577 static void *pppol2tp_seq_start(struct seq_file
*m
, loff_t
*offs
)
1579 struct pppol2tp_seq_data
*pd
= SEQ_START_TOKEN
;
1586 BUG_ON(m
->private == NULL
);
1588 net
= seq_file_net(m
);
1590 if (pd
->tunnel
== NULL
)
1591 pppol2tp_next_tunnel(net
, pd
);
1593 pppol2tp_next_session(net
, pd
);
1595 /* NULL tunnel and session indicates end of list */
1596 if ((pd
->tunnel
== NULL
) && (pd
->session
== NULL
))
1603 static void *pppol2tp_seq_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
1609 static void pppol2tp_seq_stop(struct seq_file
*p
, void *v
)
1614 static void pppol2tp_seq_tunnel_show(struct seq_file
*m
, void *v
)
1616 struct l2tp_tunnel
*tunnel
= v
;
1618 seq_printf(m
, "\nTUNNEL '%s', %c %d\n",
1620 (tunnel
== tunnel
->sock
->sk_user_data
) ? 'Y' : 'N',
1621 refcount_read(&tunnel
->ref_count
) - 1);
1622 seq_printf(m
, " %08x %ld/%ld/%ld %ld/%ld/%ld\n",
1624 atomic_long_read(&tunnel
->stats
.tx_packets
),
1625 atomic_long_read(&tunnel
->stats
.tx_bytes
),
1626 atomic_long_read(&tunnel
->stats
.tx_errors
),
1627 atomic_long_read(&tunnel
->stats
.rx_packets
),
1628 atomic_long_read(&tunnel
->stats
.rx_bytes
),
1629 atomic_long_read(&tunnel
->stats
.rx_errors
));
1632 static void pppol2tp_seq_session_show(struct seq_file
*m
, void *v
)
1634 struct l2tp_session
*session
= v
;
1635 struct l2tp_tunnel
*tunnel
= session
->tunnel
;
1636 unsigned char state
;
1643 struct inet_sock
*inet
= inet_sk(tunnel
->sock
);
1644 ip
= ntohl(inet
->inet_saddr
);
1645 port
= ntohs(inet
->inet_sport
);
1648 sk
= pppol2tp_session_get_sock(session
);
1650 state
= sk
->sk_state
;
1651 user_data_ok
= (session
== sk
->sk_user_data
) ? 'Y' : 'N';
1657 seq_printf(m
, " SESSION '%s' %08X/%d %04X/%04X -> "
1658 "%04X/%04X %d %c\n",
1659 session
->name
, ip
, port
,
1661 session
->session_id
,
1662 tunnel
->peer_tunnel_id
,
1663 session
->peer_session_id
,
1664 state
, user_data_ok
);
1665 seq_printf(m
, " %d/%d/%c/%c/%s %08x %u\n",
1666 session
->mtu
, session
->mru
,
1667 session
->recv_seq
? 'R' : '-',
1668 session
->send_seq
? 'S' : '-',
1669 session
->lns_mode
? "LNS" : "LAC",
1671 jiffies_to_msecs(session
->reorder_timeout
));
1672 seq_printf(m
, " %hu/%hu %ld/%ld/%ld %ld/%ld/%ld\n",
1673 session
->nr
, session
->ns
,
1674 atomic_long_read(&session
->stats
.tx_packets
),
1675 atomic_long_read(&session
->stats
.tx_bytes
),
1676 atomic_long_read(&session
->stats
.tx_errors
),
1677 atomic_long_read(&session
->stats
.rx_packets
),
1678 atomic_long_read(&session
->stats
.rx_bytes
),
1679 atomic_long_read(&session
->stats
.rx_errors
));
1682 struct pppox_sock
*po
= pppox_sk(sk
);
1684 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.
1708 pppol2tp_seq_tunnel_show(m
, pd
->tunnel
);
1710 pppol2tp_seq_session_show(m
, pd
->session
);
1711 l2tp_session_dec_refcount(pd
->session
);
1718 static const struct seq_operations pppol2tp_seq_ops
= {
1719 .start
= pppol2tp_seq_start
,
1720 .next
= pppol2tp_seq_next
,
1721 .stop
= pppol2tp_seq_stop
,
1722 .show
= pppol2tp_seq_show
,
1725 /* Called when our /proc file is opened. We allocate data for use when
1726 * iterating our tunnel / session contexts and store it in the private
1727 * data of the seq_file.
1729 static int pppol2tp_proc_open(struct inode
*inode
, struct file
*file
)
1731 return seq_open_net(inode
, file
, &pppol2tp_seq_ops
,
1732 sizeof(struct pppol2tp_seq_data
));
1735 static const struct file_operations pppol2tp_proc_fops
= {
1736 .open
= pppol2tp_proc_open
,
1738 .llseek
= seq_lseek
,
1739 .release
= seq_release_net
,
1742 #endif /* CONFIG_PROC_FS */
1744 /*****************************************************************************
1746 *****************************************************************************/
1748 static __net_init
int pppol2tp_init_net(struct net
*net
)
1750 struct proc_dir_entry
*pde
;
1753 pde
= proc_create("pppol2tp", S_IRUGO
, net
->proc_net
,
1754 &pppol2tp_proc_fops
);
1764 static __net_exit
void pppol2tp_exit_net(struct net
*net
)
1766 remove_proc_entry("pppol2tp", net
->proc_net
);
1769 static struct pernet_operations pppol2tp_net_ops
= {
1770 .init
= pppol2tp_init_net
,
1771 .exit
= pppol2tp_exit_net
,
1772 .id
= &pppol2tp_net_id
,
1776 /*****************************************************************************
1778 *****************************************************************************/
1780 static const struct proto_ops pppol2tp_ops
= {
1782 .owner
= THIS_MODULE
,
1783 .release
= pppol2tp_release
,
1784 .bind
= sock_no_bind
,
1785 .connect
= pppol2tp_connect
,
1786 .socketpair
= sock_no_socketpair
,
1787 .accept
= sock_no_accept
,
1788 .getname
= pppol2tp_getname
,
1789 .poll
= datagram_poll
,
1790 .listen
= sock_no_listen
,
1791 .shutdown
= sock_no_shutdown
,
1792 .setsockopt
= pppol2tp_setsockopt
,
1793 .getsockopt
= pppol2tp_getsockopt
,
1794 .sendmsg
= pppol2tp_sendmsg
,
1795 .recvmsg
= pppol2tp_recvmsg
,
1796 .mmap
= sock_no_mmap
,
1797 .ioctl
= pppox_ioctl
,
1800 static const struct pppox_proto pppol2tp_proto
= {
1801 .create
= pppol2tp_create
,
1802 .ioctl
= pppol2tp_ioctl
,
1803 .owner
= THIS_MODULE
,
1806 #ifdef CONFIG_L2TP_V3
1808 static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops
= {
1809 .session_create
= pppol2tp_session_create
,
1810 .session_delete
= l2tp_session_delete
,
1813 #endif /* CONFIG_L2TP_V3 */
1815 static int __init
pppol2tp_init(void)
1819 err
= register_pernet_device(&pppol2tp_net_ops
);
1823 err
= proto_register(&pppol2tp_sk_proto
, 0);
1825 goto out_unregister_pppol2tp_pernet
;
1827 err
= register_pppox_proto(PX_PROTO_OL2TP
, &pppol2tp_proto
);
1829 goto out_unregister_pppol2tp_proto
;
1831 #ifdef CONFIG_L2TP_V3
1832 err
= l2tp_nl_register_ops(L2TP_PWTYPE_PPP
, &pppol2tp_nl_cmd_ops
);
1834 goto out_unregister_pppox
;
1837 pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION
);
1842 #ifdef CONFIG_L2TP_V3
1843 out_unregister_pppox
:
1844 unregister_pppox_proto(PX_PROTO_OL2TP
);
1846 out_unregister_pppol2tp_proto
:
1847 proto_unregister(&pppol2tp_sk_proto
);
1848 out_unregister_pppol2tp_pernet
:
1849 unregister_pernet_device(&pppol2tp_net_ops
);
1853 static void __exit
pppol2tp_exit(void)
1855 #ifdef CONFIG_L2TP_V3
1856 l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP
);
1858 unregister_pppox_proto(PX_PROTO_OL2TP
);
1859 proto_unregister(&pppol2tp_sk_proto
);
1860 unregister_pernet_device(&pppol2tp_net_ops
);
1863 module_init(pppol2tp_init
);
1864 module_exit(pppol2tp_exit
);
1866 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1867 MODULE_DESCRIPTION("PPP over L2TP over UDP");
1868 MODULE_LICENSE("GPL");
1869 MODULE_VERSION(PPPOL2TP_DRV_VERSION
);
1870 MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX
, PX_PROTO_OL2TP
);
1871 MODULE_ALIAS_L2TP_PWTYPE(7);