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 #include <linux/module.h>
61 #include <linux/string.h>
62 #include <linux/list.h>
63 #include <linux/uaccess.h>
65 #include <linux/kernel.h>
66 #include <linux/spinlock.h>
67 #include <linux/kthread.h>
68 #include <linux/sched.h>
69 #include <linux/slab.h>
70 #include <linux/errno.h>
71 #include <linux/jiffies.h>
73 #include <linux/netdevice.h>
74 #include <linux/net.h>
75 #include <linux/inetdevice.h>
76 #include <linux/skbuff.h>
77 #include <linux/init.h>
79 #include <linux/udp.h>
80 #include <linux/if_pppox.h>
81 #include <linux/if_pppol2tp.h>
83 #include <linux/ppp_channel.h>
84 #include <linux/ppp_defs.h>
85 #include <linux/if_ppp.h>
86 #include <linux/file.h>
87 #include <linux/hash.h>
88 #include <linux/sort.h>
89 #include <linux/proc_fs.h>
90 #include <linux/l2tp.h>
91 #include <linux/nsproxy.h>
92 #include <net/net_namespace.h>
93 #include <net/netns/generic.h>
98 #include <net/inet_common.h>
100 #include <asm/byteorder.h>
101 #include <linux/atomic.h>
103 #include "l2tp_core.h"
105 #define PPPOL2TP_DRV_VERSION "V2.0"
107 /* Space for UDP, L2TP and PPP headers */
108 #define PPPOL2TP_HEADER_OVERHEAD 40
110 #define PRINTK(_mask, _type, _lvl, _fmt, args...) \
112 if ((_mask) & (_type)) \
113 printk(_lvl "PPPOL2TP: " _fmt, ##args); \
116 /* Number of bytes to build transmit L2TP headers.
117 * Unfortunately the size is different depending on whether sequence numbers
120 #define PPPOL2TP_L2TP_HDR_SIZE_SEQ 10
121 #define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ 6
123 /* Private data of each session. This data lives at the end of struct
124 * l2tp_session, referenced via session->priv[].
126 struct pppol2tp_session {
127 int owner; /* pid that opened the socket */
129 struct sock *sock; /* Pointer to the session
131 struct sock *tunnel_sock; /* Pointer to the tunnel UDP
133 int flags; /* accessed by PPPIOCGFLAGS.
137 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb);
139 static const struct ppp_channel_ops pppol2tp_chan_ops = {
140 .start_xmit = pppol2tp_xmit,
143 static const struct proto_ops pppol2tp_ops;
145 /* Helpers to obtain tunnel/session contexts from sockets.
147 static inline struct l2tp_session *pppol2tp_sock_to_session(struct sock *sk)
149 struct l2tp_session *session;
155 session = (struct l2tp_session *)(sk->sk_user_data);
156 if (session == NULL) {
161 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
167 /*****************************************************************************
168 * Receive data handling
169 *****************************************************************************/
171 static int pppol2tp_recv_payload_hook(struct sk_buff *skb)
173 /* Skip PPP header, if present. In testing, Microsoft L2TP clients
174 * don't send the PPP header (PPP header compression enabled), but
175 * other clients can include the header. So we cope with both cases
176 * here. The PPP header is always FF03 when using L2TP.
178 * Note that skb->data[] isn't dereferenced from a u16 ptr here since
179 * the field may be unaligned.
181 if (!pskb_may_pull(skb, 2))
184 if ((skb->data[0] == 0xff) && (skb->data[1] == 0x03))
190 /* Receive message. This is the recvmsg for the PPPoL2TP socket.
192 static int pppol2tp_recvmsg(struct kiocb *iocb, struct socket *sock,
193 struct msghdr *msg, size_t len,
198 struct sock *sk = sock->sk;
201 if (sk->sk_state & PPPOX_BOUND)
205 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
206 flags & MSG_DONTWAIT, &err);
212 else if (len < skb->len)
213 msg->msg_flags |= MSG_TRUNC;
215 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len);
216 if (likely(err == 0))
224 static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
226 struct pppol2tp_session *ps = l2tp_session_priv(session);
227 struct sock *sk = NULL;
229 /* If the socket is bound, send it in to PPP's input queue. Otherwise
230 * queue it on the session socket.
236 if (sk->sk_state & PPPOX_BOUND) {
237 struct pppox_sock *po;
238 PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG,
239 "%s: recv %d byte data frame, passing to ppp\n",
240 session->name, data_len);
242 /* We need to forget all info related to the L2TP packet
243 * gathered in the skb as we are going to reuse the same
244 * skb for the inner packet.
246 * - reset xfrm (IPSec) information as it applies to
247 * the outer L2TP packet and not to the inner one
248 * - release the dst to force a route lookup on the inner
249 * IP packet since skb->dst currently points to the dst
251 * - reset netfilter information as it doesn't apply
252 * to the inner packet either
259 ppp_input(&po->chan, skb);
261 PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_INFO,
262 "%s: socket not bound\n", session->name);
264 /* Not bound. Nothing we can do, so discard. */
265 session->stats.rx_errors++;
272 PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_INFO,
273 "%s: no socket\n", session->name);
277 static void pppol2tp_session_sock_hold(struct l2tp_session *session)
279 struct pppol2tp_session *ps = l2tp_session_priv(session);
285 static void pppol2tp_session_sock_put(struct l2tp_session *session)
287 struct pppol2tp_session *ps = l2tp_session_priv(session);
293 /************************************************************************
295 ***********************************************************************/
297 /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here
298 * when a user application does a sendmsg() on the session socket. L2TP and
299 * PPP headers must be inserted into the user's data.
301 static int pppol2tp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
304 static const unsigned char ppph[2] = { 0xff, 0x03 };
305 struct sock *sk = sock->sk;
308 struct l2tp_session *session;
309 struct l2tp_tunnel *tunnel;
310 struct pppol2tp_session *ps;
314 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
317 /* Get session and tunnel contexts */
319 session = pppol2tp_sock_to_session(sk);
323 ps = l2tp_session_priv(session);
324 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
328 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
330 /* Allocate a socket buffer */
332 skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) +
333 uhlen + session->hdr_len +
334 sizeof(ppph) + total_len,
337 goto error_put_sess_tun;
339 /* Reserve space for headers. */
340 skb_reserve(skb, NET_SKB_PAD);
341 skb_reset_network_header(skb);
342 skb_reserve(skb, sizeof(struct iphdr));
343 skb_reset_transport_header(skb);
344 skb_reserve(skb, uhlen);
347 skb->data[0] = ppph[0];
348 skb->data[1] = ppph[1];
351 /* Copy user data into skb */
352 error = memcpy_fromiovec(skb_put(skb, total_len), m->msg_iov,
356 goto error_put_sess_tun;
360 l2tp_xmit_skb(session, skb, session->hdr_len);
363 sock_put(ps->tunnel_sock);
369 sock_put(ps->tunnel_sock);
376 /* Transmit function called by generic PPP driver. Sends PPP frame
377 * over PPPoL2TP socket.
379 * This is almost the same as pppol2tp_sendmsg(), but rather than
380 * being called with a msghdr from userspace, it is called with a skb
383 * The supplied skb from ppp doesn't have enough headroom for the
384 * insertion of L2TP, UDP and IP headers so we need to allocate more
385 * headroom in the skb. This will create a cloned skb. But we must be
386 * careful in the error case because the caller will expect to free
387 * the skb it supplied, not our cloned skb. So we take care to always
388 * leave the original skb unfreed if we return an error.
390 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
392 static const u8 ppph[2] = { 0xff, 0x03 };
393 struct sock *sk = (struct sock *) chan->private;
395 struct l2tp_session *session;
396 struct l2tp_tunnel *tunnel;
397 struct pppol2tp_session *ps;
402 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
405 /* Get session and tunnel contexts from the socket */
406 session = pppol2tp_sock_to_session(sk);
410 ps = l2tp_session_priv(session);
411 sk_tun = ps->tunnel_sock;
414 tunnel = l2tp_sock_to_tunnel(sk_tun);
418 old_headroom = skb_headroom(skb);
419 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
420 headroom = NET_SKB_PAD +
421 sizeof(struct iphdr) + /* IP header */
422 uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */
423 session->hdr_len + /* L2TP header */
424 sizeof(ppph); /* PPP header */
425 if (skb_cow_head(skb, headroom))
426 goto abort_put_sess_tun;
428 new_headroom = skb_headroom(skb);
429 skb->truesize += new_headroom - old_headroom;
431 /* Setup PPP header */
432 __skb_push(skb, sizeof(ppph));
433 skb->data[0] = ppph[0];
434 skb->data[1] = ppph[1];
437 l2tp_xmit_skb(session, skb, session->hdr_len);
449 /* Free the original skb */
454 /*****************************************************************************
455 * Session (and tunnel control) socket create/destroy.
456 *****************************************************************************/
458 /* Called by l2tp_core when a session socket is being closed.
460 static void pppol2tp_session_close(struct l2tp_session *session)
462 struct pppol2tp_session *ps = l2tp_session_priv(session);
463 struct sock *sk = ps->sock;
464 struct socket *sock = sk->sk_socket;
466 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
470 inet_shutdown(sock, 2);
471 /* Don't let the session go away before our socket does */
472 l2tp_session_inc_refcount(session);
477 /* Really kill the session socket. (Called from sock_put() if
480 static void pppol2tp_session_destruct(struct sock *sk)
482 struct l2tp_session *session;
484 if (sk->sk_user_data != NULL) {
485 session = sk->sk_user_data;
489 sk->sk_user_data = NULL;
490 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
491 l2tp_session_dec_refcount(session);
498 /* Called when the PPPoX socket (session) is closed.
500 static int pppol2tp_release(struct socket *sock)
502 struct sock *sk = sock->sk;
503 struct l2tp_session *session;
511 if (sock_flag(sk, SOCK_DEAD) != 0)
514 pppox_unbind_sock(sk);
516 /* Signal the death of the socket. */
517 sk->sk_state = PPPOX_DEAD;
521 session = pppol2tp_sock_to_session(sk);
523 /* Purge any queued data */
524 if (session != NULL) {
525 l2tp_session_queue_purge(session);
528 skb_queue_purge(&sk->sk_receive_queue);
529 skb_queue_purge(&sk->sk_write_queue);
533 /* This will delete the session context via
534 * pppol2tp_session_destruct() if the socket's refcnt drops to
546 static struct proto pppol2tp_sk_proto = {
548 .owner = THIS_MODULE,
549 .obj_size = sizeof(struct pppox_sock),
552 static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb)
556 rc = l2tp_udp_encap_recv(sk, skb);
560 return NET_RX_SUCCESS;
563 /* socket() handler. Initialize a new struct sock.
565 static int pppol2tp_create(struct net *net, struct socket *sock)
570 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto);
574 sock_init_data(sock, sk);
576 sock->state = SS_UNCONNECTED;
577 sock->ops = &pppol2tp_ops;
579 sk->sk_backlog_rcv = pppol2tp_backlog_recv;
580 sk->sk_protocol = PX_PROTO_OL2TP;
581 sk->sk_family = PF_PPPOX;
582 sk->sk_state = PPPOX_NONE;
583 sk->sk_type = SOCK_STREAM;
584 sk->sk_destruct = pppol2tp_session_destruct;
592 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
593 static void pppol2tp_show(struct seq_file *m, void *arg)
595 struct l2tp_session *session = arg;
596 struct pppol2tp_session *ps = l2tp_session_priv(session);
599 struct pppox_sock *po = pppox_sk(ps->sock);
601 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
606 /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
608 static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
609 int sockaddr_len, int flags)
611 struct sock *sk = sock->sk;
612 struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr;
613 struct sockaddr_pppol2tpv3 *sp3 = (struct sockaddr_pppol2tpv3 *) uservaddr;
614 struct pppox_sock *po = pppox_sk(sk);
615 struct l2tp_session *session = NULL;
616 struct l2tp_tunnel *tunnel;
617 struct pppol2tp_session *ps;
618 struct dst_entry *dst;
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 if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) {
646 fd = sp->pppol2tp.fd;
647 tunnel_id = sp->pppol2tp.s_tunnel;
648 peer_tunnel_id = sp->pppol2tp.d_tunnel;
649 session_id = sp->pppol2tp.s_session;
650 peer_session_id = sp->pppol2tp.d_session;
651 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) {
653 fd = sp3->pppol2tp.fd;
654 tunnel_id = sp3->pppol2tp.s_tunnel;
655 peer_tunnel_id = sp3->pppol2tp.d_tunnel;
656 session_id = sp3->pppol2tp.s_session;
657 peer_session_id = sp3->pppol2tp.d_session;
660 goto end; /* bad socket address */
663 /* Don't bind if tunnel_id is 0 */
668 tunnel = l2tp_tunnel_get(sock_net(sk), tunnel_id);
672 /* Special case: create tunnel context if session_id and
673 * peer_session_id is 0. Otherwise look up tunnel using supplied
676 if ((session_id == 0) && (peer_session_id == 0)) {
677 if (tunnel == NULL) {
678 struct l2tp_tunnel_cfg tcfg = {
679 .encap = L2TP_ENCAPTYPE_UDP,
682 error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel);
687 /* Error if we can't find the tunnel */
692 /* Error if socket is not prepped */
693 if (tunnel->sock == NULL)
697 if (tunnel->recv_payload_hook == NULL)
698 tunnel->recv_payload_hook = pppol2tp_recv_payload_hook;
700 if (tunnel->peer_tunnel_id == 0) {
702 tunnel->peer_tunnel_id = sp->pppol2tp.d_tunnel;
704 tunnel->peer_tunnel_id = sp3->pppol2tp.d_tunnel;
707 session = l2tp_session_get(sock_net(sk), tunnel, session_id, false);
710 ps = l2tp_session_priv(session);
712 /* Using a pre-existing session is fine as long as it hasn't
713 * been connected yet.
720 /* consistency checks */
721 if (ps->tunnel_sock != tunnel->sock) {
726 /* Default MTU must allow space for UDP/L2TP/PPP headers */
727 cfg.mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
730 session = l2tp_session_create(sizeof(struct pppol2tp_session),
732 peer_session_id, &cfg);
733 if (IS_ERR(session)) {
734 error = PTR_ERR(session);
739 /* Associate session with its PPPoL2TP socket */
740 ps = l2tp_session_priv(session);
741 ps->owner = current->pid;
743 ps->tunnel_sock = tunnel->sock;
745 session->recv_skb = pppol2tp_recv;
746 session->session_close = pppol2tp_session_close;
747 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
748 session->show = pppol2tp_show;
751 /* We need to know each time a skb is dropped from the reorder
754 session->ref = pppol2tp_session_sock_hold;
755 session->deref = pppol2tp_session_sock_put;
757 /* If PMTU discovery was enabled, use the MTU that was discovered */
758 dst = sk_dst_get(tunnel->sock);
760 u32 pmtu = dst_mtu(dst);
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 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
798 "%s: created\n", session->name);
802 l2tp_session_dec_refcount(session);
804 l2tp_tunnel_dec_refcount(tunnel);
810 #ifdef CONFIG_L2TP_V3
812 /* Called when creating sessions via the netlink interface. */
813 static int pppol2tp_session_create(struct net *net, struct l2tp_tunnel *tunnel,
814 u32 session_id, u32 peer_session_id,
815 struct l2tp_session_cfg *cfg)
818 struct l2tp_session *session;
819 struct pppol2tp_session *ps;
821 /* Error if tunnel socket is not prepped */
827 /* Default MTU values. */
829 cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
833 /* Allocate and initialize a new session context. */
834 session = l2tp_session_create(sizeof(struct pppol2tp_session),
836 peer_session_id, cfg);
837 if (IS_ERR(session)) {
838 error = PTR_ERR(session);
842 ps = l2tp_session_priv(session);
843 ps->tunnel_sock = tunnel->sock;
845 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
846 "%s: created\n", session->name);
854 #endif /* CONFIG_L2TP_V3 */
856 /* getname() support.
858 static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
859 int *usockaddr_len, int peer)
863 struct l2tp_session *session;
864 struct l2tp_tunnel *tunnel;
865 struct sock *sk = sock->sk;
866 struct inet_sock *inet;
867 struct pppol2tp_session *pls;
872 if (sk->sk_state != PPPOX_CONNECTED)
876 session = pppol2tp_sock_to_session(sk);
880 pls = l2tp_session_priv(session);
881 tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock);
885 inet = inet_sk(tunnel->sock);
886 if (tunnel->version == 2) {
887 struct sockaddr_pppol2tp sp;
890 sp.sa_family = AF_PPPOX;
891 sp.sa_protocol = PX_PROTO_OL2TP;
892 sp.pppol2tp.fd = tunnel->fd;
893 sp.pppol2tp.pid = pls->owner;
894 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
895 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
896 sp.pppol2tp.s_session = session->session_id;
897 sp.pppol2tp.d_session = session->peer_session_id;
898 sp.pppol2tp.addr.sin_family = AF_INET;
899 sp.pppol2tp.addr.sin_port = inet->inet_dport;
900 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
901 memcpy(uaddr, &sp, len);
902 } else if (tunnel->version == 3) {
903 struct sockaddr_pppol2tpv3 sp;
906 sp.sa_family = AF_PPPOX;
907 sp.sa_protocol = PX_PROTO_OL2TP;
908 sp.pppol2tp.fd = tunnel->fd;
909 sp.pppol2tp.pid = pls->owner;
910 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
911 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
912 sp.pppol2tp.s_session = session->session_id;
913 sp.pppol2tp.d_session = session->peer_session_id;
914 sp.pppol2tp.addr.sin_family = AF_INET;
915 sp.pppol2tp.addr.sin_port = inet->inet_dport;
916 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
917 memcpy(uaddr, &sp, len);
920 *usockaddr_len = len;
923 sock_put(pls->tunnel_sock);
930 /****************************************************************************
933 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
934 * sockets. However, in order to control kernel tunnel features, we allow
935 * userspace to create a special "tunnel" PPPoX socket which is used for
936 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
937 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
939 ****************************************************************************/
941 static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest,
942 struct l2tp_stats *stats)
944 dest->tx_packets = stats->tx_packets;
945 dest->tx_bytes = stats->tx_bytes;
946 dest->tx_errors = stats->tx_errors;
947 dest->rx_packets = stats->rx_packets;
948 dest->rx_bytes = stats->rx_bytes;
949 dest->rx_seq_discards = stats->rx_seq_discards;
950 dest->rx_oos_packets = stats->rx_oos_packets;
951 dest->rx_errors = stats->rx_errors;
954 /* Session ioctl helper.
956 static int pppol2tp_session_ioctl(struct l2tp_session *session,
957 unsigned int cmd, unsigned long arg)
963 struct pppol2tp_session *ps = l2tp_session_priv(session);
964 struct l2tp_tunnel *tunnel = session->tunnel;
965 struct pppol2tp_ioc_stats stats;
967 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG,
968 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
969 session->name, cmd, arg);
980 if (!(sk->sk_state & PPPOX_CONNECTED))
984 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
986 ifr.ifr_mtu = session->mtu;
987 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
990 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
991 "%s: get mtu=%d\n", session->name, session->mtu);
997 if (!(sk->sk_state & PPPOX_CONNECTED))
1001 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1004 session->mtu = ifr.ifr_mtu;
1006 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1007 "%s: set mtu=%d\n", session->name, session->mtu);
1013 if (!(sk->sk_state & PPPOX_CONNECTED))
1017 if (put_user(session->mru, (int __user *) arg))
1020 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1021 "%s: get mru=%d\n", session->name, session->mru);
1027 if (!(sk->sk_state & PPPOX_CONNECTED))
1031 if (get_user(val, (int __user *) arg))
1035 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1036 "%s: set mru=%d\n", session->name, session->mru);
1042 if (put_user(ps->flags, (int __user *) arg))
1045 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1046 "%s: get flags=%d\n", session->name, ps->flags);
1052 if (get_user(val, (int __user *) arg))
1055 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1056 "%s: set flags=%d\n", session->name, ps->flags);
1060 case PPPIOCGL2TPSTATS:
1062 if (!(sk->sk_state & PPPOX_CONNECTED))
1065 memset(&stats, 0, sizeof(stats));
1066 stats.tunnel_id = tunnel->tunnel_id;
1067 stats.session_id = session->session_id;
1068 pppol2tp_copy_stats(&stats, &session->stats);
1069 if (copy_to_user((void __user *) arg, &stats,
1072 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1073 "%s: get L2TP stats\n", session->name);
1087 /* Tunnel ioctl helper.
1089 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1090 * specifies a session_id, the session ioctl handler is called. This allows an
1091 * application to retrieve session stats via a tunnel socket.
1093 static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
1094 unsigned int cmd, unsigned long arg)
1098 struct pppol2tp_ioc_stats stats;
1100 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG,
1101 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1102 tunnel->name, cmd, arg);
1108 case PPPIOCGL2TPSTATS:
1110 if (!(sk->sk_state & PPPOX_CONNECTED))
1113 if (copy_from_user(&stats, (void __user *) arg,
1118 if (stats.session_id != 0) {
1119 /* resend to session ioctl handler */
1120 struct l2tp_session *session =
1121 l2tp_session_get(sock_net(sk), tunnel,
1122 stats.session_id, true);
1125 err = pppol2tp_session_ioctl(session, cmd,
1128 session->deref(session);
1129 l2tp_session_dec_refcount(session);
1136 stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
1138 pppol2tp_copy_stats(&stats, &tunnel->stats);
1139 if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) {
1143 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1144 "%s: get L2TP stats\n", tunnel->name);
1158 /* Main ioctl() handler.
1159 * Dispatch to tunnel or session helpers depending on the socket.
1161 static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
1164 struct sock *sk = sock->sk;
1165 struct l2tp_session *session;
1166 struct l2tp_tunnel *tunnel;
1167 struct pppol2tp_session *ps;
1174 if (sock_flag(sk, SOCK_DEAD) != 0)
1178 if ((sk->sk_user_data == NULL) ||
1179 (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
1182 /* Get session context from the socket */
1184 session = pppol2tp_sock_to_session(sk);
1185 if (session == NULL)
1188 /* Special case: if session's session_id is zero, treat ioctl as a
1191 ps = l2tp_session_priv(session);
1192 if ((session->session_id == 0) &&
1193 (session->peer_session_id == 0)) {
1195 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1199 err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
1200 sock_put(ps->tunnel_sock);
1204 err = pppol2tp_session_ioctl(session, cmd, arg);
1212 /*****************************************************************************
1213 * setsockopt() / getsockopt() support.
1215 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1216 * sockets. In order to control kernel tunnel features, we allow userspace to
1217 * create a special "tunnel" PPPoX socket which is used for control only.
1218 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1219 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1220 *****************************************************************************/
1222 /* Tunnel setsockopt() helper.
1224 static int pppol2tp_tunnel_setsockopt(struct sock *sk,
1225 struct l2tp_tunnel *tunnel,
1226 int optname, int val)
1231 case PPPOL2TP_SO_DEBUG:
1232 tunnel->debug = val;
1233 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1234 "%s: set debug=%x\n", tunnel->name, tunnel->debug);
1245 /* Session setsockopt helper.
1247 static int pppol2tp_session_setsockopt(struct sock *sk,
1248 struct l2tp_session *session,
1249 int optname, int val)
1252 struct pppol2tp_session *ps = l2tp_session_priv(session);
1255 case PPPOL2TP_SO_RECVSEQ:
1256 if ((val != 0) && (val != 1)) {
1260 session->recv_seq = val ? -1 : 0;
1261 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1262 "%s: set recv_seq=%d\n", session->name, session->recv_seq);
1265 case PPPOL2TP_SO_SENDSEQ:
1266 if ((val != 0) && (val != 1)) {
1270 session->send_seq = val ? -1 : 0;
1272 struct sock *ssk = ps->sock;
1273 struct pppox_sock *po = pppox_sk(ssk);
1274 po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
1275 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1277 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1278 "%s: set send_seq=%d\n", session->name, session->send_seq);
1281 case PPPOL2TP_SO_LNSMODE:
1282 if ((val != 0) && (val != 1)) {
1286 session->lns_mode = val ? -1 : 0;
1287 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1288 "%s: set lns_mode=%d\n", session->name, session->lns_mode);
1291 case PPPOL2TP_SO_DEBUG:
1292 session->debug = val;
1293 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1294 "%s: set debug=%x\n", session->name, session->debug);
1297 case PPPOL2TP_SO_REORDERTO:
1298 session->reorder_timeout = msecs_to_jiffies(val);
1299 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1300 "%s: set reorder_timeout=%d\n", session->name, session->reorder_timeout);
1311 /* Main setsockopt() entry point.
1312 * Does API checks, then calls either the tunnel or session setsockopt
1313 * handler, according to whether the PPPoL2TP socket is a for a regular
1314 * session or the special tunnel type.
1316 static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
1317 char __user *optval, unsigned int optlen)
1319 struct sock *sk = sock->sk;
1320 struct l2tp_session *session;
1321 struct l2tp_tunnel *tunnel;
1322 struct pppol2tp_session *ps;
1326 if (level != SOL_PPPOL2TP)
1329 if (optlen < sizeof(int))
1332 if (get_user(val, (int __user *)optval))
1336 if (sk->sk_user_data == NULL)
1339 /* Get session context from the socket */
1341 session = pppol2tp_sock_to_session(sk);
1342 if (session == NULL)
1345 /* Special case: if session_id == 0x0000, treat as operation on tunnel
1347 ps = l2tp_session_priv(session);
1348 if ((session->session_id == 0) &&
1349 (session->peer_session_id == 0)) {
1351 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1355 err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
1356 sock_put(ps->tunnel_sock);
1358 err = pppol2tp_session_setsockopt(sk, session, optname, val);
1366 /* Tunnel getsockopt helper. Called with sock locked.
1368 static int pppol2tp_tunnel_getsockopt(struct sock *sk,
1369 struct l2tp_tunnel *tunnel,
1370 int optname, int *val)
1375 case PPPOL2TP_SO_DEBUG:
1376 *val = tunnel->debug;
1377 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1378 "%s: get debug=%x\n", tunnel->name, tunnel->debug);
1389 /* Session getsockopt helper. Called with sock locked.
1391 static int pppol2tp_session_getsockopt(struct sock *sk,
1392 struct l2tp_session *session,
1393 int optname, int *val)
1398 case PPPOL2TP_SO_RECVSEQ:
1399 *val = session->recv_seq;
1400 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1401 "%s: get recv_seq=%d\n", session->name, *val);
1404 case PPPOL2TP_SO_SENDSEQ:
1405 *val = session->send_seq;
1406 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1407 "%s: get send_seq=%d\n", session->name, *val);
1410 case PPPOL2TP_SO_LNSMODE:
1411 *val = session->lns_mode;
1412 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1413 "%s: get lns_mode=%d\n", session->name, *val);
1416 case PPPOL2TP_SO_DEBUG:
1417 *val = session->debug;
1418 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1419 "%s: get debug=%d\n", session->name, *val);
1422 case PPPOL2TP_SO_REORDERTO:
1423 *val = (int) jiffies_to_msecs(session->reorder_timeout);
1424 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1425 "%s: get reorder_timeout=%d\n", session->name, *val);
1435 /* Main getsockopt() entry point.
1436 * Does API checks, then calls either the tunnel or session getsockopt
1437 * handler, according to whether the PPPoX socket is a for a regular session
1438 * or the special tunnel type.
1440 static int pppol2tp_getsockopt(struct socket *sock, int level,
1441 int optname, char __user *optval, int __user *optlen)
1443 struct sock *sk = sock->sk;
1444 struct l2tp_session *session;
1445 struct l2tp_tunnel *tunnel;
1448 struct pppol2tp_session *ps;
1450 if (level != SOL_PPPOL2TP)
1453 if (get_user(len, (int __user *) optlen))
1456 len = min_t(unsigned int, len, sizeof(int));
1462 if (sk->sk_user_data == NULL)
1465 /* Get the session context */
1467 session = pppol2tp_sock_to_session(sk);
1468 if (session == NULL)
1471 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1472 ps = l2tp_session_priv(session);
1473 if ((session->session_id == 0) &&
1474 (session->peer_session_id == 0)) {
1476 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1480 err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
1481 sock_put(ps->tunnel_sock);
1485 err = pppol2tp_session_getsockopt(sk, session, optname, &val);
1491 if (put_user(len, (int __user *) optlen))
1494 if (copy_to_user((void __user *) optval, &val, len))
1505 /*****************************************************************************
1506 * /proc filesystem for debug
1507 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1508 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1509 *****************************************************************************/
1511 static unsigned int pppol2tp_net_id;
1513 #ifdef CONFIG_PROC_FS
1515 struct pppol2tp_seq_data {
1516 struct seq_net_private p;
1517 int tunnel_idx; /* current tunnel */
1518 int session_idx; /* index of session within current tunnel */
1519 struct l2tp_tunnel *tunnel;
1520 struct l2tp_session *session; /* NULL means get next tunnel */
1523 static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
1526 pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx);
1529 if (pd->tunnel == NULL)
1532 /* Ignore L2TPv3 tunnels */
1533 if (pd->tunnel->version < 3)
1538 static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
1540 pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx, true);
1543 if (pd->session == NULL) {
1544 pd->session_idx = 0;
1545 pppol2tp_next_tunnel(net, pd);
1549 static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
1551 struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
1558 BUG_ON(m->private == NULL);
1560 net = seq_file_net(m);
1562 if (pd->tunnel == NULL)
1563 pppol2tp_next_tunnel(net, pd);
1565 pppol2tp_next_session(net, pd);
1567 /* NULL tunnel and session indicates end of list */
1568 if ((pd->tunnel == NULL) && (pd->session == NULL))
1575 static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
1581 static void pppol2tp_seq_stop(struct seq_file *p, void *v)
1586 static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
1588 struct l2tp_tunnel *tunnel = v;
1590 seq_printf(m, "\nTUNNEL '%s', %c %d\n",
1592 (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
1593 atomic_read(&tunnel->ref_count) - 1);
1594 seq_printf(m, " %08x %llu/%llu/%llu %llu/%llu/%llu\n",
1596 (unsigned long long)tunnel->stats.tx_packets,
1597 (unsigned long long)tunnel->stats.tx_bytes,
1598 (unsigned long long)tunnel->stats.tx_errors,
1599 (unsigned long long)tunnel->stats.rx_packets,
1600 (unsigned long long)tunnel->stats.rx_bytes,
1601 (unsigned long long)tunnel->stats.rx_errors);
1604 static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
1606 struct l2tp_session *session = v;
1607 struct l2tp_tunnel *tunnel = session->tunnel;
1608 struct pppol2tp_session *ps = l2tp_session_priv(session);
1609 struct pppox_sock *po = pppox_sk(ps->sock);
1614 struct inet_sock *inet = inet_sk(tunnel->sock);
1615 ip = ntohl(inet->inet_saddr);
1616 port = ntohs(inet->inet_sport);
1619 seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
1620 "%04X/%04X %d %c\n",
1621 session->name, ip, port,
1623 session->session_id,
1624 tunnel->peer_tunnel_id,
1625 session->peer_session_id,
1627 (session == ps->sock->sk_user_data) ?
1629 seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n",
1630 session->mtu, session->mru,
1631 session->recv_seq ? 'R' : '-',
1632 session->send_seq ? 'S' : '-',
1633 session->lns_mode ? "LNS" : "LAC",
1635 jiffies_to_msecs(session->reorder_timeout));
1636 seq_printf(m, " %hu/%hu %llu/%llu/%llu %llu/%llu/%llu\n",
1637 session->nr, session->ns,
1638 (unsigned long long)session->stats.tx_packets,
1639 (unsigned long long)session->stats.tx_bytes,
1640 (unsigned long long)session->stats.tx_errors,
1641 (unsigned long long)session->stats.rx_packets,
1642 (unsigned long long)session->stats.rx_bytes,
1643 (unsigned long long)session->stats.rx_errors);
1646 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
1649 static int pppol2tp_seq_show(struct seq_file *m, void *v)
1651 struct pppol2tp_seq_data *pd = v;
1653 /* display header on line 1 */
1654 if (v == SEQ_START_TOKEN) {
1655 seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
1656 seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
1657 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1658 seq_puts(m, " SESSION name, addr/port src-tid/sid "
1659 "dest-tid/sid state user-data-ok\n");
1660 seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1661 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1665 /* Show the tunnel or session context.
1668 pppol2tp_seq_tunnel_show(m, pd->tunnel);
1670 pppol2tp_seq_session_show(m, pd->session);
1671 if (pd->session->deref)
1672 pd->session->deref(pd->session);
1673 l2tp_session_dec_refcount(pd->session);
1680 static const struct seq_operations pppol2tp_seq_ops = {
1681 .start = pppol2tp_seq_start,
1682 .next = pppol2tp_seq_next,
1683 .stop = pppol2tp_seq_stop,
1684 .show = pppol2tp_seq_show,
1687 /* Called when our /proc file is opened. We allocate data for use when
1688 * iterating our tunnel / session contexts and store it in the private
1689 * data of the seq_file.
1691 static int pppol2tp_proc_open(struct inode *inode, struct file *file)
1693 return seq_open_net(inode, file, &pppol2tp_seq_ops,
1694 sizeof(struct pppol2tp_seq_data));
1697 static const struct file_operations pppol2tp_proc_fops = {
1698 .owner = THIS_MODULE,
1699 .open = pppol2tp_proc_open,
1701 .llseek = seq_lseek,
1702 .release = seq_release_net,
1705 #endif /* CONFIG_PROC_FS */
1707 /*****************************************************************************
1709 *****************************************************************************/
1711 static __net_init int pppol2tp_init_net(struct net *net)
1713 struct proc_dir_entry *pde;
1716 pde = proc_net_fops_create(net, "pppol2tp", S_IRUGO, &pppol2tp_proc_fops);
1726 static __net_exit void pppol2tp_exit_net(struct net *net)
1728 proc_net_remove(net, "pppol2tp");
1731 static struct pernet_operations pppol2tp_net_ops = {
1732 .init = pppol2tp_init_net,
1733 .exit = pppol2tp_exit_net,
1734 .id = &pppol2tp_net_id,
1737 /*****************************************************************************
1739 *****************************************************************************/
1741 static const struct proto_ops pppol2tp_ops = {
1743 .owner = THIS_MODULE,
1744 .release = pppol2tp_release,
1745 .bind = sock_no_bind,
1746 .connect = pppol2tp_connect,
1747 .socketpair = sock_no_socketpair,
1748 .accept = sock_no_accept,
1749 .getname = pppol2tp_getname,
1750 .poll = datagram_poll,
1751 .listen = sock_no_listen,
1752 .shutdown = sock_no_shutdown,
1753 .setsockopt = pppol2tp_setsockopt,
1754 .getsockopt = pppol2tp_getsockopt,
1755 .sendmsg = pppol2tp_sendmsg,
1756 .recvmsg = pppol2tp_recvmsg,
1757 .mmap = sock_no_mmap,
1758 .ioctl = pppox_ioctl,
1761 static const struct pppox_proto pppol2tp_proto = {
1762 .create = pppol2tp_create,
1763 .ioctl = pppol2tp_ioctl,
1764 .owner = THIS_MODULE,
1767 #ifdef CONFIG_L2TP_V3
1769 static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = {
1770 .session_create = pppol2tp_session_create,
1771 .session_delete = l2tp_session_delete,
1774 #endif /* CONFIG_L2TP_V3 */
1776 static int __init pppol2tp_init(void)
1780 err = register_pernet_device(&pppol2tp_net_ops);
1784 err = proto_register(&pppol2tp_sk_proto, 0);
1786 goto out_unregister_pppol2tp_pernet;
1788 err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
1790 goto out_unregister_pppol2tp_proto;
1792 #ifdef CONFIG_L2TP_V3
1793 err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops);
1795 goto out_unregister_pppox;
1798 printk(KERN_INFO "PPPoL2TP kernel driver, %s\n",
1799 PPPOL2TP_DRV_VERSION);
1804 #ifdef CONFIG_L2TP_V3
1805 out_unregister_pppox:
1806 unregister_pppox_proto(PX_PROTO_OL2TP);
1808 out_unregister_pppol2tp_proto:
1809 proto_unregister(&pppol2tp_sk_proto);
1810 out_unregister_pppol2tp_pernet:
1811 unregister_pernet_device(&pppol2tp_net_ops);
1815 static void __exit pppol2tp_exit(void)
1817 #ifdef CONFIG_L2TP_V3
1818 l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP);
1820 unregister_pppox_proto(PX_PROTO_OL2TP);
1821 proto_unregister(&pppol2tp_sk_proto);
1822 unregister_pernet_device(&pppol2tp_net_ops);
1825 module_init(pppol2tp_init);
1826 module_exit(pppol2tp_exit);
1828 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1829 MODULE_DESCRIPTION("PPP over L2TP over UDP");
1830 MODULE_LICENSE("GPL");
1831 MODULE_VERSION(PPPOL2TP_DRV_VERSION);