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)
201 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
202 flags & MSG_DONTWAIT, &err);
208 else if (len < skb->len)
209 msg->msg_flags |= MSG_TRUNC;
211 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len);
212 if (likely(err == 0))
220 static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
222 struct pppol2tp_session *ps = l2tp_session_priv(session);
223 struct sock *sk = NULL;
225 /* If the socket is bound, send it in to PPP's input queue. Otherwise
226 * queue it on the session socket.
232 if (sk->sk_state & PPPOX_BOUND) {
233 struct pppox_sock *po;
234 l2tp_dbg(session, PPPOL2TP_MSG_DATA,
235 "%s: recv %d byte data frame, passing to ppp\n",
236 session->name, data_len);
238 /* We need to forget all info related to the L2TP packet
239 * gathered in the skb as we are going to reuse the same
240 * skb for the inner packet.
242 * - reset xfrm (IPSec) information as it applies to
243 * the outer L2TP packet and not to the inner one
244 * - release the dst to force a route lookup on the inner
245 * IP packet since skb->dst currently points to the dst
247 * - reset netfilter information as it doesn't apply
248 * to the inner packet either
255 ppp_input(&po->chan, skb);
257 l2tp_info(session, PPPOL2TP_MSG_DATA, "%s: socket not bound\n",
260 /* Not bound. Nothing we can do, so discard. */
261 atomic_long_inc(&session->stats.rx_errors);
268 l2tp_info(session, PPPOL2TP_MSG_DATA, "%s: no socket\n", session->name);
272 static void pppol2tp_session_sock_hold(struct l2tp_session *session)
274 struct pppol2tp_session *ps = l2tp_session_priv(session);
280 static void pppol2tp_session_sock_put(struct l2tp_session *session)
282 struct pppol2tp_session *ps = l2tp_session_priv(session);
288 /************************************************************************
290 ***********************************************************************/
292 /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here
293 * when a user application does a sendmsg() on the session socket. L2TP and
294 * PPP headers must be inserted into the user's data.
296 static int pppol2tp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
299 static const unsigned char ppph[2] = { 0xff, 0x03 };
300 struct sock *sk = sock->sk;
303 struct l2tp_session *session;
304 struct l2tp_tunnel *tunnel;
305 struct pppol2tp_session *ps;
309 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
312 /* Get session and tunnel contexts */
314 session = pppol2tp_sock_to_session(sk);
318 ps = l2tp_session_priv(session);
319 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
323 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
325 /* Allocate a socket buffer */
327 skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) +
328 uhlen + session->hdr_len +
329 sizeof(ppph) + total_len,
332 goto error_put_sess_tun;
334 /* Reserve space for headers. */
335 skb_reserve(skb, NET_SKB_PAD);
336 skb_reset_network_header(skb);
337 skb_reserve(skb, sizeof(struct iphdr));
338 skb_reset_transport_header(skb);
339 skb_reserve(skb, uhlen);
342 skb->data[0] = ppph[0];
343 skb->data[1] = ppph[1];
346 /* Copy user data into skb */
347 error = memcpy_fromiovec(skb_put(skb, total_len), m->msg_iov,
351 goto error_put_sess_tun;
355 l2tp_xmit_skb(session, skb, session->hdr_len);
358 sock_put(ps->tunnel_sock);
364 sock_put(ps->tunnel_sock);
371 /* Transmit function called by generic PPP driver. Sends PPP frame
372 * over PPPoL2TP socket.
374 * This is almost the same as pppol2tp_sendmsg(), but rather than
375 * being called with a msghdr from userspace, it is called with a skb
378 * The supplied skb from ppp doesn't have enough headroom for the
379 * insertion of L2TP, UDP and IP headers so we need to allocate more
380 * headroom in the skb. This will create a cloned skb. But we must be
381 * careful in the error case because the caller will expect to free
382 * the skb it supplied, not our cloned skb. So we take care to always
383 * leave the original skb unfreed if we return an error.
385 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
387 static const u8 ppph[2] = { 0xff, 0x03 };
388 struct sock *sk = (struct sock *) chan->private;
390 struct l2tp_session *session;
391 struct l2tp_tunnel *tunnel;
392 struct pppol2tp_session *ps;
395 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
398 /* Get session and tunnel contexts from the socket */
399 session = pppol2tp_sock_to_session(sk);
403 ps = l2tp_session_priv(session);
404 sk_tun = ps->tunnel_sock;
407 tunnel = l2tp_sock_to_tunnel(sk_tun);
411 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
412 headroom = NET_SKB_PAD +
413 sizeof(struct iphdr) + /* IP header */
414 uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */
415 session->hdr_len + /* L2TP header */
416 sizeof(ppph); /* PPP header */
417 if (skb_cow_head(skb, headroom))
418 goto abort_put_sess_tun;
420 /* Setup PPP header */
421 __skb_push(skb, sizeof(ppph));
422 skb->data[0] = ppph[0];
423 skb->data[1] = ppph[1];
426 l2tp_xmit_skb(session, skb, session->hdr_len);
438 /* Free the original skb */
443 /*****************************************************************************
444 * Session (and tunnel control) socket create/destroy.
445 *****************************************************************************/
447 /* Called by l2tp_core when a session socket is being closed.
449 static void pppol2tp_session_close(struct l2tp_session *session)
451 struct pppol2tp_session *ps = l2tp_session_priv(session);
452 struct sock *sk = ps->sock;
453 struct socket *sock = sk->sk_socket;
455 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
459 inet_shutdown(sock, 2);
460 /* Don't let the session go away before our socket does */
461 l2tp_session_inc_refcount(session);
466 /* Really kill the session socket. (Called from sock_put() if
469 static void pppol2tp_session_destruct(struct sock *sk)
471 struct l2tp_session *session = sk->sk_user_data;
473 sk->sk_user_data = NULL;
474 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
475 l2tp_session_dec_refcount(session);
480 /* Called when the PPPoX socket (session) is closed.
482 static int pppol2tp_release(struct socket *sock)
484 struct sock *sk = sock->sk;
485 struct l2tp_session *session;
493 if (sock_flag(sk, SOCK_DEAD) != 0)
496 pppox_unbind_sock(sk);
498 /* Signal the death of the socket. */
499 sk->sk_state = PPPOX_DEAD;
503 session = pppol2tp_sock_to_session(sk);
505 /* Purge any queued data */
506 if (session != NULL) {
507 __l2tp_session_unhash(session);
508 l2tp_session_queue_purge(session);
511 skb_queue_purge(&sk->sk_receive_queue);
512 skb_queue_purge(&sk->sk_write_queue);
516 /* This will delete the session context via
517 * pppol2tp_session_destruct() if the socket's refcnt drops to
529 static struct proto pppol2tp_sk_proto = {
531 .owner = THIS_MODULE,
532 .obj_size = sizeof(struct pppox_sock),
535 static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb)
539 rc = l2tp_udp_encap_recv(sk, skb);
543 return NET_RX_SUCCESS;
546 /* socket() handler. Initialize a new struct sock.
548 static int pppol2tp_create(struct net *net, struct socket *sock)
553 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto);
557 sock_init_data(sock, sk);
559 sock->state = SS_UNCONNECTED;
560 sock->ops = &pppol2tp_ops;
562 sk->sk_backlog_rcv = pppol2tp_backlog_recv;
563 sk->sk_protocol = PX_PROTO_OL2TP;
564 sk->sk_family = PF_PPPOX;
565 sk->sk_state = PPPOX_NONE;
566 sk->sk_type = SOCK_STREAM;
567 sk->sk_destruct = pppol2tp_session_destruct;
575 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
576 static void pppol2tp_show(struct seq_file *m, void *arg)
578 struct l2tp_session *session = arg;
579 struct pppol2tp_session *ps = l2tp_session_priv(session);
582 struct pppox_sock *po = pppox_sk(ps->sock);
584 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
589 /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
591 static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
592 int sockaddr_len, int flags)
594 struct sock *sk = sock->sk;
595 struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr;
596 struct pppox_sock *po = pppox_sk(sk);
597 struct l2tp_session *session = NULL;
598 struct l2tp_tunnel *tunnel;
599 struct pppol2tp_session *ps;
600 struct dst_entry *dst;
601 struct l2tp_session_cfg cfg = { 0, };
603 u32 tunnel_id, peer_tunnel_id;
604 u32 session_id, peer_session_id;
611 if (sp->sa_protocol != PX_PROTO_OL2TP)
614 /* Check for already bound sockets */
616 if (sk->sk_state & PPPOX_CONNECTED)
619 /* We don't supporting rebinding anyway */
621 if (sk->sk_user_data)
622 goto end; /* socket is already attached */
624 /* Get params from socket address. Handle L2TPv2 and L2TPv3.
625 * This is nasty because there are different sockaddr_pppol2tp
626 * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use
627 * the sockaddr size to determine which structure the caller
631 if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) {
632 fd = sp->pppol2tp.fd;
633 tunnel_id = sp->pppol2tp.s_tunnel;
634 peer_tunnel_id = sp->pppol2tp.d_tunnel;
635 session_id = sp->pppol2tp.s_session;
636 peer_session_id = sp->pppol2tp.d_session;
637 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) {
638 struct sockaddr_pppol2tpv3 *sp3 =
639 (struct sockaddr_pppol2tpv3 *) sp;
641 fd = sp3->pppol2tp.fd;
642 tunnel_id = sp3->pppol2tp.s_tunnel;
643 peer_tunnel_id = sp3->pppol2tp.d_tunnel;
644 session_id = sp3->pppol2tp.s_session;
645 peer_session_id = sp3->pppol2tp.d_session;
646 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpin6)) {
647 struct sockaddr_pppol2tpin6 *sp6 =
648 (struct sockaddr_pppol2tpin6 *) sp;
649 fd = sp6->pppol2tp.fd;
650 tunnel_id = sp6->pppol2tp.s_tunnel;
651 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
652 session_id = sp6->pppol2tp.s_session;
653 peer_session_id = sp6->pppol2tp.d_session;
654 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3in6)) {
655 struct sockaddr_pppol2tpv3in6 *sp6 =
656 (struct sockaddr_pppol2tpv3in6 *) sp;
658 fd = sp6->pppol2tp.fd;
659 tunnel_id = sp6->pppol2tp.s_tunnel;
660 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
661 session_id = sp6->pppol2tp.s_session;
662 peer_session_id = sp6->pppol2tp.d_session;
665 goto end; /* bad socket address */
668 /* Don't bind if tunnel_id is 0 */
673 tunnel = l2tp_tunnel_find(sock_net(sk), tunnel_id);
675 /* Special case: create tunnel context if session_id and
676 * peer_session_id is 0. Otherwise look up tunnel using supplied
679 if ((session_id == 0) && (peer_session_id == 0)) {
680 if (tunnel == NULL) {
681 struct l2tp_tunnel_cfg tcfg = {
682 .encap = L2TP_ENCAPTYPE_UDP,
685 error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel);
690 /* Error if we can't find the tunnel */
695 /* Error if socket is not prepped */
696 if (tunnel->sock == NULL)
700 if (tunnel->recv_payload_hook == NULL)
701 tunnel->recv_payload_hook = pppol2tp_recv_payload_hook;
703 if (tunnel->peer_tunnel_id == 0)
704 tunnel->peer_tunnel_id = peer_tunnel_id;
706 /* Create session if it doesn't already exist. We handle the
707 * case where a session was previously created by the netlink
708 * interface by checking that the session doesn't already have
709 * a socket and its tunnel socket are what we expect. If any
710 * of those checks fail, return EEXIST to the caller.
712 session = l2tp_session_find(sock_net(sk), tunnel, session_id);
713 if (session == NULL) {
714 /* Default MTU must allow space for UDP/L2TP/PPP
717 cfg.mtu = cfg.mru = 1500 - PPPOL2TP_HEADER_OVERHEAD;
719 /* Allocate and initialize a new session context. */
720 session = l2tp_session_create(sizeof(struct pppol2tp_session),
722 peer_session_id, &cfg);
723 if (session == NULL) {
728 ps = l2tp_session_priv(session);
730 if (ps->sock != NULL)
733 /* consistency checks */
734 if (ps->tunnel_sock != tunnel->sock)
738 /* Associate session with its PPPoL2TP socket */
739 ps = l2tp_session_priv(session);
740 ps->owner = current->pid;
742 ps->tunnel_sock = tunnel->sock;
744 session->recv_skb = pppol2tp_recv;
745 session->session_close = pppol2tp_session_close;
746 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
747 session->show = pppol2tp_show;
750 /* We need to know each time a skb is dropped from the reorder
753 session->ref = pppol2tp_session_sock_hold;
754 session->deref = pppol2tp_session_sock_put;
756 /* If PMTU discovery was enabled, use the MTU that was discovered */
757 dst = sk_dst_get(tunnel->sock);
759 u32 pmtu = dst_mtu(dst);
762 session->mtu = session->mru = pmtu -
763 PPPOL2TP_HEADER_OVERHEAD;
767 /* Special case: if source & dest session_id == 0x0000, this
768 * socket is being created to manage the tunnel. Just set up
769 * the internal context for use by ioctl() and sockopt()
772 if ((session->session_id == 0) &&
773 (session->peer_session_id == 0)) {
778 /* The only header we need to worry about is the L2TP
779 * header. This size is different depending on whether
780 * sequence numbers are enabled for the data channel.
782 po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
784 po->chan.private = sk;
785 po->chan.ops = &pppol2tp_chan_ops;
786 po->chan.mtu = session->mtu;
788 error = ppp_register_net_channel(sock_net(sk), &po->chan);
793 /* This is how we get the session context from the socket. */
794 sk->sk_user_data = session;
795 sk->sk_state = PPPOX_CONNECTED;
796 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: created\n",
805 #ifdef CONFIG_L2TP_V3
807 /* Called when creating sessions via the netlink interface.
809 static int pppol2tp_session_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg)
812 struct l2tp_tunnel *tunnel;
813 struct l2tp_session *session;
814 struct pppol2tp_session *ps;
816 tunnel = l2tp_tunnel_find(net, tunnel_id);
818 /* Error if we can't find the tunnel */
823 /* Error if tunnel socket is not prepped */
824 if (tunnel->sock == NULL)
827 /* Check that this session doesn't already exist */
829 session = l2tp_session_find(net, tunnel, session_id);
833 /* Default MTU values. */
835 cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
839 /* Allocate and initialize a new session context. */
841 session = l2tp_session_create(sizeof(struct pppol2tp_session),
843 peer_session_id, cfg);
847 ps = l2tp_session_priv(session);
848 ps->tunnel_sock = tunnel->sock;
850 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: created\n",
859 #endif /* CONFIG_L2TP_V3 */
861 /* getname() support.
863 static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
864 int *usockaddr_len, int peer)
868 struct l2tp_session *session;
869 struct l2tp_tunnel *tunnel;
870 struct sock *sk = sock->sk;
871 struct inet_sock *inet;
872 struct pppol2tp_session *pls;
877 if (sk->sk_state != PPPOX_CONNECTED)
881 session = pppol2tp_sock_to_session(sk);
885 pls = l2tp_session_priv(session);
886 tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock);
887 if (tunnel == NULL) {
892 inet = inet_sk(tunnel->sock);
893 if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) {
894 struct sockaddr_pppol2tp sp;
897 sp.sa_family = AF_PPPOX;
898 sp.sa_protocol = PX_PROTO_OL2TP;
899 sp.pppol2tp.fd = tunnel->fd;
900 sp.pppol2tp.pid = pls->owner;
901 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
902 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
903 sp.pppol2tp.s_session = session->session_id;
904 sp.pppol2tp.d_session = session->peer_session_id;
905 sp.pppol2tp.addr.sin_family = AF_INET;
906 sp.pppol2tp.addr.sin_port = inet->inet_dport;
907 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
908 memcpy(uaddr, &sp, len);
909 #if IS_ENABLED(CONFIG_IPV6)
910 } else if ((tunnel->version == 2) &&
911 (tunnel->sock->sk_family == AF_INET6)) {
912 struct ipv6_pinfo *np = inet6_sk(tunnel->sock);
913 struct sockaddr_pppol2tpin6 sp;
916 sp.sa_family = AF_PPPOX;
917 sp.sa_protocol = PX_PROTO_OL2TP;
918 sp.pppol2tp.fd = tunnel->fd;
919 sp.pppol2tp.pid = pls->owner;
920 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
921 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
922 sp.pppol2tp.s_session = session->session_id;
923 sp.pppol2tp.d_session = session->peer_session_id;
924 sp.pppol2tp.addr.sin6_family = AF_INET6;
925 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
926 memcpy(&sp.pppol2tp.addr.sin6_addr, &np->daddr,
928 memcpy(uaddr, &sp, len);
929 } else if ((tunnel->version == 3) &&
930 (tunnel->sock->sk_family == AF_INET6)) {
931 struct ipv6_pinfo *np = inet6_sk(tunnel->sock);
932 struct sockaddr_pppol2tpv3in6 sp;
935 sp.sa_family = AF_PPPOX;
936 sp.sa_protocol = PX_PROTO_OL2TP;
937 sp.pppol2tp.fd = tunnel->fd;
938 sp.pppol2tp.pid = pls->owner;
939 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
940 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
941 sp.pppol2tp.s_session = session->session_id;
942 sp.pppol2tp.d_session = session->peer_session_id;
943 sp.pppol2tp.addr.sin6_family = AF_INET6;
944 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
945 memcpy(&sp.pppol2tp.addr.sin6_addr, &np->daddr,
947 memcpy(uaddr, &sp, len);
949 } else if (tunnel->version == 3) {
950 struct sockaddr_pppol2tpv3 sp;
953 sp.sa_family = AF_PPPOX;
954 sp.sa_protocol = PX_PROTO_OL2TP;
955 sp.pppol2tp.fd = tunnel->fd;
956 sp.pppol2tp.pid = pls->owner;
957 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
958 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
959 sp.pppol2tp.s_session = session->session_id;
960 sp.pppol2tp.d_session = session->peer_session_id;
961 sp.pppol2tp.addr.sin_family = AF_INET;
962 sp.pppol2tp.addr.sin_port = inet->inet_dport;
963 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
964 memcpy(uaddr, &sp, len);
967 *usockaddr_len = len;
969 sock_put(pls->tunnel_sock);
978 /****************************************************************************
981 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
982 * sockets. However, in order to control kernel tunnel features, we allow
983 * userspace to create a special "tunnel" PPPoX socket which is used for
984 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
985 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
987 ****************************************************************************/
989 static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest,
990 struct l2tp_stats *stats)
992 dest->tx_packets = atomic_long_read(&stats->tx_packets);
993 dest->tx_bytes = atomic_long_read(&stats->tx_bytes);
994 dest->tx_errors = atomic_long_read(&stats->tx_errors);
995 dest->rx_packets = atomic_long_read(&stats->rx_packets);
996 dest->rx_bytes = atomic_long_read(&stats->rx_bytes);
997 dest->rx_seq_discards = atomic_long_read(&stats->rx_seq_discards);
998 dest->rx_oos_packets = atomic_long_read(&stats->rx_oos_packets);
999 dest->rx_errors = atomic_long_read(&stats->rx_errors);
1002 /* Session ioctl helper.
1004 static int pppol2tp_session_ioctl(struct l2tp_session *session,
1005 unsigned int cmd, unsigned long arg)
1010 int val = (int) arg;
1011 struct pppol2tp_session *ps = l2tp_session_priv(session);
1012 struct l2tp_tunnel *tunnel = session->tunnel;
1013 struct pppol2tp_ioc_stats stats;
1015 l2tp_dbg(session, PPPOL2TP_MSG_CONTROL,
1016 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
1017 session->name, cmd, arg);
1025 if (!(sk->sk_state & PPPOX_CONNECTED))
1029 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1031 ifr.ifr_mtu = session->mtu;
1032 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
1035 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get mtu=%d\n",
1036 session->name, session->mtu);
1042 if (!(sk->sk_state & PPPOX_CONNECTED))
1046 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1049 session->mtu = ifr.ifr_mtu;
1051 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set mtu=%d\n",
1052 session->name, session->mtu);
1058 if (!(sk->sk_state & PPPOX_CONNECTED))
1062 if (put_user(session->mru, (int __user *) arg))
1065 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get mru=%d\n",
1066 session->name, session->mru);
1072 if (!(sk->sk_state & PPPOX_CONNECTED))
1076 if (get_user(val, (int __user *) arg))
1080 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set mru=%d\n",
1081 session->name, session->mru);
1087 if (put_user(ps->flags, (int __user *) arg))
1090 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get flags=%d\n",
1091 session->name, ps->flags);
1097 if (get_user(val, (int __user *) arg))
1100 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set flags=%d\n",
1101 session->name, ps->flags);
1105 case PPPIOCGL2TPSTATS:
1107 if (!(sk->sk_state & PPPOX_CONNECTED))
1110 memset(&stats, 0, sizeof(stats));
1111 stats.tunnel_id = tunnel->tunnel_id;
1112 stats.session_id = session->session_id;
1113 pppol2tp_copy_stats(&stats, &session->stats);
1114 if (copy_to_user((void __user *) arg, &stats,
1117 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1132 /* Tunnel ioctl helper.
1134 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1135 * specifies a session_id, the session ioctl handler is called. This allows an
1136 * application to retrieve session stats via a tunnel socket.
1138 static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
1139 unsigned int cmd, unsigned long arg)
1143 struct pppol2tp_ioc_stats stats;
1145 l2tp_dbg(tunnel, PPPOL2TP_MSG_CONTROL,
1146 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1147 tunnel->name, cmd, arg);
1153 case PPPIOCGL2TPSTATS:
1155 if (!(sk->sk_state & PPPOX_CONNECTED))
1158 if (copy_from_user(&stats, (void __user *) arg,
1163 if (stats.session_id != 0) {
1164 /* resend to session ioctl handler */
1165 struct l2tp_session *session =
1166 l2tp_session_find(sock_net(sk), tunnel, stats.session_id);
1167 if (session != NULL)
1168 err = pppol2tp_session_ioctl(session, cmd, arg);
1174 stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
1176 pppol2tp_copy_stats(&stats, &tunnel->stats);
1177 if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) {
1181 l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1196 /* Main ioctl() handler.
1197 * Dispatch to tunnel or session helpers depending on the socket.
1199 static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
1202 struct sock *sk = sock->sk;
1203 struct l2tp_session *session;
1204 struct l2tp_tunnel *tunnel;
1205 struct pppol2tp_session *ps;
1212 if (sock_flag(sk, SOCK_DEAD) != 0)
1216 if ((sk->sk_user_data == NULL) ||
1217 (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
1220 /* Get session context from the socket */
1222 session = pppol2tp_sock_to_session(sk);
1223 if (session == NULL)
1226 /* Special case: if session's session_id is zero, treat ioctl as a
1229 ps = l2tp_session_priv(session);
1230 if ((session->session_id == 0) &&
1231 (session->peer_session_id == 0)) {
1233 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1237 err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
1238 sock_put(ps->tunnel_sock);
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, PPPOL2TP_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)
1290 struct pppol2tp_session *ps = l2tp_session_priv(session);
1293 case PPPOL2TP_SO_RECVSEQ:
1294 if ((val != 0) && (val != 1)) {
1298 session->recv_seq = val ? -1 : 0;
1299 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1300 "%s: set recv_seq=%d\n",
1301 session->name, session->recv_seq);
1304 case PPPOL2TP_SO_SENDSEQ:
1305 if ((val != 0) && (val != 1)) {
1309 session->send_seq = val ? -1 : 0;
1311 struct sock *ssk = ps->sock;
1312 struct pppox_sock *po = pppox_sk(ssk);
1313 po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
1314 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1316 l2tp_info(session, PPPOL2TP_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 ? -1 : 0;
1327 l2tp_info(session, PPPOL2TP_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, PPPOL2TP_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, PPPOL2TP_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;
1364 struct pppol2tp_session *ps;
1368 if (level != SOL_PPPOL2TP)
1371 if (optlen < sizeof(int))
1374 if (get_user(val, (int __user *)optval))
1378 if (sk->sk_user_data == NULL)
1381 /* Get session context from the socket */
1383 session = pppol2tp_sock_to_session(sk);
1384 if (session == NULL)
1387 /* Special case: if session_id == 0x0000, treat as operation on tunnel
1389 ps = l2tp_session_priv(session);
1390 if ((session->session_id == 0) &&
1391 (session->peer_session_id == 0)) {
1393 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1397 err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
1398 sock_put(ps->tunnel_sock);
1400 err = pppol2tp_session_setsockopt(sk, session, optname, val);
1410 /* Tunnel getsockopt helper. Called with sock locked.
1412 static int pppol2tp_tunnel_getsockopt(struct sock *sk,
1413 struct l2tp_tunnel *tunnel,
1414 int optname, int *val)
1419 case PPPOL2TP_SO_DEBUG:
1420 *val = tunnel->debug;
1421 l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: get debug=%x\n",
1422 tunnel->name, tunnel->debug);
1433 /* Session getsockopt helper. Called with sock locked.
1435 static int pppol2tp_session_getsockopt(struct sock *sk,
1436 struct l2tp_session *session,
1437 int optname, int *val)
1442 case PPPOL2TP_SO_RECVSEQ:
1443 *val = session->recv_seq;
1444 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1445 "%s: get recv_seq=%d\n", session->name, *val);
1448 case PPPOL2TP_SO_SENDSEQ:
1449 *val = session->send_seq;
1450 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1451 "%s: get send_seq=%d\n", session->name, *val);
1454 case PPPOL2TP_SO_LNSMODE:
1455 *val = session->lns_mode;
1456 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1457 "%s: get lns_mode=%d\n", session->name, *val);
1460 case PPPOL2TP_SO_DEBUG:
1461 *val = session->debug;
1462 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get debug=%d\n",
1463 session->name, *val);
1466 case PPPOL2TP_SO_REORDERTO:
1467 *val = (int) jiffies_to_msecs(session->reorder_timeout);
1468 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1469 "%s: get reorder_timeout=%d\n", session->name, *val);
1479 /* Main getsockopt() entry point.
1480 * Does API checks, then calls either the tunnel or session getsockopt
1481 * handler, according to whether the PPPoX socket is a for a regular session
1482 * or the special tunnel type.
1484 static int pppol2tp_getsockopt(struct socket *sock, int level, int optname,
1485 char __user *optval, int __user *optlen)
1487 struct sock *sk = sock->sk;
1488 struct l2tp_session *session;
1489 struct l2tp_tunnel *tunnel;
1492 struct pppol2tp_session *ps;
1494 if (level != SOL_PPPOL2TP)
1497 if (get_user(len, optlen))
1500 len = min_t(unsigned int, len, sizeof(int));
1506 if (sk->sk_user_data == NULL)
1509 /* Get the session context */
1511 session = pppol2tp_sock_to_session(sk);
1512 if (session == NULL)
1515 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1516 ps = l2tp_session_priv(session);
1517 if ((session->session_id == 0) &&
1518 (session->peer_session_id == 0)) {
1520 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1524 err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
1525 sock_put(ps->tunnel_sock);
1527 err = pppol2tp_session_getsockopt(sk, session, optname, &val);
1530 if (put_user(len, optlen))
1533 if (copy_to_user((void __user *) optval, &val, len))
1544 /*****************************************************************************
1545 * /proc filesystem for debug
1546 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1547 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1548 *****************************************************************************/
1550 static unsigned int pppol2tp_net_id;
1552 #ifdef CONFIG_PROC_FS
1554 struct pppol2tp_seq_data {
1555 struct seq_net_private p;
1556 int tunnel_idx; /* current tunnel */
1557 int session_idx; /* index of session within current tunnel */
1558 struct l2tp_tunnel *tunnel;
1559 struct l2tp_session *session; /* NULL means get next tunnel */
1562 static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
1565 pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx);
1568 if (pd->tunnel == NULL)
1571 /* Ignore L2TPv3 tunnels */
1572 if (pd->tunnel->version < 3)
1577 static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
1579 pd->session = l2tp_session_find_nth(pd->tunnel, pd->session_idx);
1582 if (pd->session == NULL) {
1583 pd->session_idx = 0;
1584 pppol2tp_next_tunnel(net, pd);
1588 static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
1590 struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
1597 BUG_ON(m->private == NULL);
1599 net = seq_file_net(m);
1601 if (pd->tunnel == NULL)
1602 pppol2tp_next_tunnel(net, pd);
1604 pppol2tp_next_session(net, pd);
1606 /* NULL tunnel and session indicates end of list */
1607 if ((pd->tunnel == NULL) && (pd->session == NULL))
1614 static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
1620 static void pppol2tp_seq_stop(struct seq_file *p, void *v)
1625 static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
1627 struct l2tp_tunnel *tunnel = v;
1629 seq_printf(m, "\nTUNNEL '%s', %c %d\n",
1631 (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
1632 atomic_read(&tunnel->ref_count) - 1);
1633 seq_printf(m, " %08x %ld/%ld/%ld %ld/%ld/%ld\n",
1635 atomic_long_read(&tunnel->stats.tx_packets),
1636 atomic_long_read(&tunnel->stats.tx_bytes),
1637 atomic_long_read(&tunnel->stats.tx_errors),
1638 atomic_long_read(&tunnel->stats.rx_packets),
1639 atomic_long_read(&tunnel->stats.rx_bytes),
1640 atomic_long_read(&tunnel->stats.rx_errors));
1643 static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
1645 struct l2tp_session *session = v;
1646 struct l2tp_tunnel *tunnel = session->tunnel;
1647 struct pppol2tp_session *ps = l2tp_session_priv(session);
1648 struct pppox_sock *po = pppox_sk(ps->sock);
1653 struct inet_sock *inet = inet_sk(tunnel->sock);
1654 ip = ntohl(inet->inet_saddr);
1655 port = ntohs(inet->inet_sport);
1658 seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
1659 "%04X/%04X %d %c\n",
1660 session->name, ip, port,
1662 session->session_id,
1663 tunnel->peer_tunnel_id,
1664 session->peer_session_id,
1666 (session == ps->sock->sk_user_data) ?
1668 seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n",
1669 session->mtu, session->mru,
1670 session->recv_seq ? 'R' : '-',
1671 session->send_seq ? 'S' : '-',
1672 session->lns_mode ? "LNS" : "LAC",
1674 jiffies_to_msecs(session->reorder_timeout));
1675 seq_printf(m, " %hu/%hu %ld/%ld/%ld %ld/%ld/%ld\n",
1676 session->nr, session->ns,
1677 atomic_long_read(&session->stats.tx_packets),
1678 atomic_long_read(&session->stats.tx_bytes),
1679 atomic_long_read(&session->stats.tx_errors),
1680 atomic_long_read(&session->stats.rx_packets),
1681 atomic_long_read(&session->stats.rx_bytes),
1682 atomic_long_read(&session->stats.rx_errors));
1685 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
1688 static int pppol2tp_seq_show(struct seq_file *m, void *v)
1690 struct pppol2tp_seq_data *pd = v;
1692 /* display header on line 1 */
1693 if (v == SEQ_START_TOKEN) {
1694 seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
1695 seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
1696 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1697 seq_puts(m, " SESSION name, addr/port src-tid/sid "
1698 "dest-tid/sid state user-data-ok\n");
1699 seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1700 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1704 /* Show the tunnel or session context.
1706 if (pd->session == NULL)
1707 pppol2tp_seq_tunnel_show(m, pd->tunnel);
1709 pppol2tp_seq_session_show(m, pd->session);
1715 static const struct seq_operations pppol2tp_seq_ops = {
1716 .start = pppol2tp_seq_start,
1717 .next = pppol2tp_seq_next,
1718 .stop = pppol2tp_seq_stop,
1719 .show = pppol2tp_seq_show,
1722 /* Called when our /proc file is opened. We allocate data for use when
1723 * iterating our tunnel / session contexts and store it in the private
1724 * data of the seq_file.
1726 static int pppol2tp_proc_open(struct inode *inode, struct file *file)
1728 return seq_open_net(inode, file, &pppol2tp_seq_ops,
1729 sizeof(struct pppol2tp_seq_data));
1732 static const struct file_operations pppol2tp_proc_fops = {
1733 .owner = THIS_MODULE,
1734 .open = pppol2tp_proc_open,
1736 .llseek = seq_lseek,
1737 .release = seq_release_net,
1740 #endif /* CONFIG_PROC_FS */
1742 /*****************************************************************************
1744 *****************************************************************************/
1746 static __net_init int pppol2tp_init_net(struct net *net)
1748 struct proc_dir_entry *pde;
1751 pde = proc_create("pppol2tp", S_IRUGO, net->proc_net,
1752 &pppol2tp_proc_fops);
1762 static __net_exit void pppol2tp_exit_net(struct net *net)
1764 remove_proc_entry("pppol2tp", net->proc_net);
1767 static struct pernet_operations pppol2tp_net_ops = {
1768 .init = pppol2tp_init_net,
1769 .exit = pppol2tp_exit_net,
1770 .id = &pppol2tp_net_id,
1773 /*****************************************************************************
1775 *****************************************************************************/
1777 static const struct proto_ops pppol2tp_ops = {
1779 .owner = THIS_MODULE,
1780 .release = pppol2tp_release,
1781 .bind = sock_no_bind,
1782 .connect = pppol2tp_connect,
1783 .socketpair = sock_no_socketpair,
1784 .accept = sock_no_accept,
1785 .getname = pppol2tp_getname,
1786 .poll = datagram_poll,
1787 .listen = sock_no_listen,
1788 .shutdown = sock_no_shutdown,
1789 .setsockopt = pppol2tp_setsockopt,
1790 .getsockopt = pppol2tp_getsockopt,
1791 .sendmsg = pppol2tp_sendmsg,
1792 .recvmsg = pppol2tp_recvmsg,
1793 .mmap = sock_no_mmap,
1794 .ioctl = pppox_ioctl,
1797 static const struct pppox_proto pppol2tp_proto = {
1798 .create = pppol2tp_create,
1799 .ioctl = pppol2tp_ioctl,
1800 .owner = THIS_MODULE,
1803 #ifdef CONFIG_L2TP_V3
1805 static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = {
1806 .session_create = pppol2tp_session_create,
1807 .session_delete = l2tp_session_delete,
1810 #endif /* CONFIG_L2TP_V3 */
1812 static int __init pppol2tp_init(void)
1816 err = register_pernet_device(&pppol2tp_net_ops);
1820 err = proto_register(&pppol2tp_sk_proto, 0);
1822 goto out_unregister_pppol2tp_pernet;
1824 err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
1826 goto out_unregister_pppol2tp_proto;
1828 #ifdef CONFIG_L2TP_V3
1829 err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops);
1831 goto out_unregister_pppox;
1834 pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION);
1839 #ifdef CONFIG_L2TP_V3
1840 out_unregister_pppox:
1841 unregister_pppox_proto(PX_PROTO_OL2TP);
1843 out_unregister_pppol2tp_proto:
1844 proto_unregister(&pppol2tp_sk_proto);
1845 out_unregister_pppol2tp_pernet:
1846 unregister_pernet_device(&pppol2tp_net_ops);
1850 static void __exit pppol2tp_exit(void)
1852 #ifdef CONFIG_L2TP_V3
1853 l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP);
1855 unregister_pppox_proto(PX_PROTO_OL2TP);
1856 proto_unregister(&pppol2tp_sk_proto);
1857 unregister_pernet_device(&pppol2tp_net_ops);
1860 module_init(pppol2tp_init);
1861 module_exit(pppol2tp_exit);
1863 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1864 MODULE_DESCRIPTION("PPP over L2TP over UDP");
1865 MODULE_LICENSE("GPL");
1866 MODULE_VERSION(PPPOL2TP_DRV_VERSION);
1867 MODULE_ALIAS("pppox-proto-" __stringify(PX_PROTO_OL2TP));