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>
99 #include <asm/byteorder.h>
100 #include <asm/atomic.h>
102 #include "l2tp_core.h"
104 #define PPPOL2TP_DRV_VERSION "V2.0"
106 /* Space for UDP, L2TP and PPP headers */
107 #define PPPOL2TP_HEADER_OVERHEAD 40
109 #define PRINTK(_mask, _type, _lvl, _fmt, args...) \
111 if ((_mask) & (_type)) \
112 printk(_lvl "PPPOL2TP: " _fmt, ##args); \
115 /* Number of bytes to build transmit L2TP headers.
116 * Unfortunately the size is different depending on whether sequence numbers
119 #define PPPOL2TP_L2TP_HDR_SIZE_SEQ 10
120 #define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ 6
122 /* Private data of each session. This data lives at the end of struct
123 * l2tp_session, referenced via session->priv[].
125 struct pppol2tp_session {
126 int owner; /* pid that opened the socket */
128 struct sock *sock; /* Pointer to the session
130 struct sock *tunnel_sock; /* Pointer to the tunnel UDP
132 int flags; /* accessed by PPPIOCGFLAGS.
136 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb);
138 static const struct ppp_channel_ops pppol2tp_chan_ops = {
139 .start_xmit = pppol2tp_xmit,
142 static const struct proto_ops pppol2tp_ops;
144 /* Helpers to obtain tunnel/session contexts from sockets.
146 static inline struct l2tp_session *pppol2tp_sock_to_session(struct sock *sk)
148 struct l2tp_session *session;
154 session = (struct l2tp_session *)(sk->sk_user_data);
155 if (session == NULL) {
160 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
166 /*****************************************************************************
167 * Receive data handling
168 *****************************************************************************/
170 static int pppol2tp_recv_payload_hook(struct sk_buff *skb)
172 /* Skip PPP header, if present. In testing, Microsoft L2TP clients
173 * don't send the PPP header (PPP header compression enabled), but
174 * other clients can include the header. So we cope with both cases
175 * here. The PPP header is always FF03 when using L2TP.
177 * Note that skb->data[] isn't dereferenced from a u16 ptr here since
178 * the field may be unaligned.
180 if (!pskb_may_pull(skb, 2))
183 if ((skb->data[0] == 0xff) && (skb->data[1] == 0x03))
189 /* Receive message. This is the recvmsg for the PPPoL2TP socket.
191 static int pppol2tp_recvmsg(struct kiocb *iocb, struct socket *sock,
192 struct msghdr *msg, size_t len,
197 struct sock *sk = sock->sk;
200 if (sk->sk_state & PPPOX_BOUND)
203 msg->msg_namelen = 0;
206 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
207 flags & MSG_DONTWAIT, &err);
213 else if (len < skb->len)
214 msg->msg_flags |= MSG_TRUNC;
216 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len);
217 if (likely(err == 0))
225 static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
227 struct pppol2tp_session *ps = l2tp_session_priv(session);
228 struct sock *sk = NULL;
230 /* If the socket is bound, send it in to PPP's input queue. Otherwise
231 * queue it on the session socket.
237 if (sk->sk_state & PPPOX_BOUND) {
238 struct pppox_sock *po;
239 PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG,
240 "%s: recv %d byte data frame, passing to ppp\n",
241 session->name, data_len);
243 /* We need to forget all info related to the L2TP packet
244 * gathered in the skb as we are going to reuse the same
245 * skb for the inner packet.
247 * - reset xfrm (IPSec) information as it applies to
248 * the outer L2TP packet and not to the inner one
249 * - release the dst to force a route lookup on the inner
250 * IP packet since skb->dst currently points to the dst
252 * - reset netfilter information as it doesn't apply
253 * to the inner packet either
260 ppp_input(&po->chan, skb);
262 PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_INFO,
263 "%s: socket not bound\n", session->name);
265 /* Not bound. Nothing we can do, so discard. */
266 session->stats.rx_errors++;
273 PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_INFO,
274 "%s: no socket\n", session->name);
278 static void pppol2tp_session_sock_hold(struct l2tp_session *session)
280 struct pppol2tp_session *ps = l2tp_session_priv(session);
286 static void pppol2tp_session_sock_put(struct l2tp_session *session)
288 struct pppol2tp_session *ps = l2tp_session_priv(session);
294 /************************************************************************
296 ***********************************************************************/
298 /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here
299 * when a user application does a sendmsg() on the session socket. L2TP and
300 * PPP headers must be inserted into the user's data.
302 static int pppol2tp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
305 static const unsigned char ppph[2] = { 0xff, 0x03 };
306 struct sock *sk = sock->sk;
309 struct l2tp_session *session;
310 struct l2tp_tunnel *tunnel;
311 struct pppol2tp_session *ps;
315 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
318 /* Get session and tunnel contexts */
320 session = pppol2tp_sock_to_session(sk);
324 ps = l2tp_session_priv(session);
325 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
329 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
331 /* Allocate a socket buffer */
333 skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) +
334 uhlen + session->hdr_len +
335 sizeof(ppph) + total_len,
338 goto error_put_sess_tun;
340 /* Reserve space for headers. */
341 skb_reserve(skb, NET_SKB_PAD);
342 skb_reset_network_header(skb);
343 skb_reserve(skb, sizeof(struct iphdr));
344 skb_reset_transport_header(skb);
345 skb_reserve(skb, uhlen);
348 skb->data[0] = ppph[0];
349 skb->data[1] = ppph[1];
352 /* Copy user data into skb */
353 error = memcpy_fromiovec(skb_put(skb, total_len), m->msg_iov,
357 goto error_put_sess_tun;
360 l2tp_xmit_skb(session, skb, session->hdr_len);
362 sock_put(ps->tunnel_sock);
368 sock_put(ps->tunnel_sock);
375 /* Transmit function called by generic PPP driver. Sends PPP frame
376 * over PPPoL2TP socket.
378 * This is almost the same as pppol2tp_sendmsg(), but rather than
379 * being called with a msghdr from userspace, it is called with a skb
382 * The supplied skb from ppp doesn't have enough headroom for the
383 * insertion of L2TP, UDP and IP headers so we need to allocate more
384 * headroom in the skb. This will create a cloned skb. But we must be
385 * careful in the error case because the caller will expect to free
386 * the skb it supplied, not our cloned skb. So we take care to always
387 * leave the original skb unfreed if we return an error.
389 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
391 static const u8 ppph[2] = { 0xff, 0x03 };
392 struct sock *sk = (struct sock *) chan->private;
394 struct l2tp_session *session;
395 struct l2tp_tunnel *tunnel;
396 struct pppol2tp_session *ps;
400 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
403 /* Get session and tunnel contexts from the socket */
404 session = pppol2tp_sock_to_session(sk);
408 ps = l2tp_session_priv(session);
409 sk_tun = ps->tunnel_sock;
412 tunnel = l2tp_sock_to_tunnel(sk_tun);
416 old_headroom = skb_headroom(skb);
417 if (skb_cow_head(skb, sizeof(ppph)))
418 goto abort_put_sess_tun;
420 new_headroom = skb_headroom(skb);
421 skb->truesize += new_headroom - old_headroom;
423 /* Setup PPP header */
424 __skb_push(skb, sizeof(ppph));
425 skb->data[0] = ppph[0];
426 skb->data[1] = ppph[1];
428 l2tp_xmit_skb(session, skb, session->hdr_len);
439 /* Free the original skb */
444 /*****************************************************************************
445 * Session (and tunnel control) socket create/destroy.
446 *****************************************************************************/
448 /* Called by l2tp_core when a session socket is being closed.
450 static void pppol2tp_session_close(struct l2tp_session *session)
452 struct pppol2tp_session *ps = l2tp_session_priv(session);
453 struct sock *sk = ps->sock;
456 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
458 if (session->session_id == 0)
464 if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) {
465 pppox_unbind_sock(sk);
466 sk->sk_state = PPPOX_DEAD;
467 sk->sk_state_change(sk);
470 /* Purge any queued data */
471 skb_queue_purge(&sk->sk_receive_queue);
472 skb_queue_purge(&sk->sk_write_queue);
473 while ((skb = skb_dequeue(&session->reorder_q))) {
485 /* Really kill the session socket. (Called from sock_put() if
488 static void pppol2tp_session_destruct(struct sock *sk)
490 struct l2tp_session *session;
492 if (sk->sk_user_data != NULL) {
493 session = sk->sk_user_data;
497 sk->sk_user_data = NULL;
498 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
499 l2tp_session_dec_refcount(session);
506 /* Called when the PPPoX socket (session) is closed.
508 static int pppol2tp_release(struct socket *sock)
510 struct sock *sk = sock->sk;
511 struct l2tp_session *session;
519 if (sock_flag(sk, SOCK_DEAD) != 0)
522 pppox_unbind_sock(sk);
524 /* Signal the death of the socket. */
525 sk->sk_state = PPPOX_DEAD;
529 session = pppol2tp_sock_to_session(sk);
531 /* Purge any queued data */
532 skb_queue_purge(&sk->sk_receive_queue);
533 skb_queue_purge(&sk->sk_write_queue);
534 if (session != NULL) {
536 while ((skb = skb_dequeue(&session->reorder_q))) {
545 /* This will delete the session context via
546 * pppol2tp_session_destruct() if the socket's refcnt drops to
558 static struct proto pppol2tp_sk_proto = {
560 .owner = THIS_MODULE,
561 .obj_size = sizeof(struct pppox_sock),
564 static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb)
568 rc = l2tp_udp_encap_recv(sk, skb);
572 return NET_RX_SUCCESS;
575 /* socket() handler. Initialize a new struct sock.
577 static int pppol2tp_create(struct net *net, struct socket *sock)
582 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto);
586 sock_init_data(sock, sk);
588 sock->state = SS_UNCONNECTED;
589 sock->ops = &pppol2tp_ops;
591 sk->sk_backlog_rcv = pppol2tp_backlog_recv;
592 sk->sk_protocol = PX_PROTO_OL2TP;
593 sk->sk_family = PF_PPPOX;
594 sk->sk_state = PPPOX_NONE;
595 sk->sk_type = SOCK_STREAM;
596 sk->sk_destruct = pppol2tp_session_destruct;
604 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
605 static void pppol2tp_show(struct seq_file *m, void *arg)
607 struct l2tp_session *session = arg;
608 struct pppol2tp_session *ps = l2tp_session_priv(session);
611 struct pppox_sock *po = pppox_sk(ps->sock);
613 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
618 /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
620 static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
621 int sockaddr_len, int flags)
623 struct sock *sk = sock->sk;
624 struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr;
625 struct sockaddr_pppol2tpv3 *sp3 = (struct sockaddr_pppol2tpv3 *) uservaddr;
626 struct pppox_sock *po = pppox_sk(sk);
627 struct l2tp_session *session = NULL;
628 struct l2tp_tunnel *tunnel;
629 struct pppol2tp_session *ps;
630 struct dst_entry *dst;
631 struct l2tp_session_cfg cfg = { 0, };
633 u32 tunnel_id, peer_tunnel_id;
634 u32 session_id, peer_session_id;
641 if (sp->sa_protocol != PX_PROTO_OL2TP)
644 /* Check for already bound sockets */
646 if (sk->sk_state & PPPOX_CONNECTED)
649 /* We don't supporting rebinding anyway */
651 if (sk->sk_user_data)
652 goto end; /* socket is already attached */
654 /* Get params from socket address. Handle L2TPv2 and L2TPv3 */
655 if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) {
656 fd = sp->pppol2tp.fd;
657 tunnel_id = sp->pppol2tp.s_tunnel;
658 peer_tunnel_id = sp->pppol2tp.d_tunnel;
659 session_id = sp->pppol2tp.s_session;
660 peer_session_id = sp->pppol2tp.d_session;
661 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) {
663 fd = sp3->pppol2tp.fd;
664 tunnel_id = sp3->pppol2tp.s_tunnel;
665 peer_tunnel_id = sp3->pppol2tp.d_tunnel;
666 session_id = sp3->pppol2tp.s_session;
667 peer_session_id = sp3->pppol2tp.d_session;
670 goto end; /* bad socket address */
673 /* Don't bind if tunnel_id is 0 */
678 tunnel = l2tp_tunnel_find(sock_net(sk), tunnel_id);
680 /* Special case: create tunnel context if session_id and
681 * peer_session_id is 0. Otherwise look up tunnel using supplied
684 if ((session_id == 0) && (peer_session_id == 0)) {
685 if (tunnel == NULL) {
686 struct l2tp_tunnel_cfg tcfg = {
687 .encap = L2TP_ENCAPTYPE_UDP,
690 error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel);
695 /* Error if we can't find the tunnel */
700 /* Error if socket is not prepped */
701 if (tunnel->sock == NULL)
705 if (tunnel->recv_payload_hook == NULL)
706 tunnel->recv_payload_hook = pppol2tp_recv_payload_hook;
708 if (tunnel->peer_tunnel_id == 0) {
710 tunnel->peer_tunnel_id = sp->pppol2tp.d_tunnel;
712 tunnel->peer_tunnel_id = sp3->pppol2tp.d_tunnel;
715 /* Create session if it doesn't already exist. We handle the
716 * case where a session was previously created by the netlink
717 * interface by checking that the session doesn't already have
718 * a socket and its tunnel socket are what we expect. If any
719 * of those checks fail, return EEXIST to the caller.
721 session = l2tp_session_find(sock_net(sk), tunnel, session_id);
722 if (session == NULL) {
723 /* Default MTU must allow space for UDP/L2TP/PPP
726 cfg.mtu = cfg.mru = 1500 - PPPOL2TP_HEADER_OVERHEAD;
728 /* Allocate and initialize a new session context. */
729 session = l2tp_session_create(sizeof(struct pppol2tp_session),
731 peer_session_id, &cfg);
732 if (session == NULL) {
737 ps = l2tp_session_priv(session);
739 if (ps->sock != NULL)
742 /* consistency checks */
743 if (ps->tunnel_sock != tunnel->sock)
747 /* Associate session with its PPPoL2TP socket */
748 ps = l2tp_session_priv(session);
749 ps->owner = current->pid;
751 ps->tunnel_sock = tunnel->sock;
753 session->recv_skb = pppol2tp_recv;
754 session->session_close = pppol2tp_session_close;
755 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
756 session->show = pppol2tp_show;
759 /* We need to know each time a skb is dropped from the reorder
762 session->ref = pppol2tp_session_sock_hold;
763 session->deref = pppol2tp_session_sock_put;
765 /* If PMTU discovery was enabled, use the MTU that was discovered */
766 dst = sk_dst_get(sk);
768 u32 pmtu = dst_mtu(__sk_dst_get(sk));
770 session->mtu = session->mru = pmtu -
771 PPPOL2TP_HEADER_OVERHEAD;
775 /* Special case: if source & dest session_id == 0x0000, this
776 * socket is being created to manage the tunnel. Just set up
777 * the internal context for use by ioctl() and sockopt()
780 if ((session->session_id == 0) &&
781 (session->peer_session_id == 0)) {
786 /* The only header we need to worry about is the L2TP
787 * header. This size is different depending on whether
788 * sequence numbers are enabled for the data channel.
790 po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
792 po->chan.private = sk;
793 po->chan.ops = &pppol2tp_chan_ops;
794 po->chan.mtu = session->mtu;
796 error = ppp_register_net_channel(sock_net(sk), &po->chan);
801 /* This is how we get the session context from the socket. */
802 sk->sk_user_data = session;
803 sk->sk_state = PPPOX_CONNECTED;
804 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
805 "%s: created\n", session->name);
813 #ifdef CONFIG_L2TP_V3
815 /* Called when creating sessions via the netlink interface.
817 static int pppol2tp_session_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg)
820 struct l2tp_tunnel *tunnel;
821 struct l2tp_session *session;
822 struct pppol2tp_session *ps;
824 tunnel = l2tp_tunnel_find(net, tunnel_id);
826 /* Error if we can't find the tunnel */
831 /* Error if tunnel socket is not prepped */
832 if (tunnel->sock == NULL)
835 /* Check that this session doesn't already exist */
837 session = l2tp_session_find(net, tunnel, session_id);
841 /* Default MTU values. */
843 cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
847 /* Allocate and initialize a new session context. */
849 session = l2tp_session_create(sizeof(struct pppol2tp_session),
851 peer_session_id, cfg);
855 ps = l2tp_session_priv(session);
856 ps->tunnel_sock = tunnel->sock;
858 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
859 "%s: created\n", session->name);
867 /* Called when deleting sessions via the netlink interface.
869 static int pppol2tp_session_delete(struct l2tp_session *session)
871 struct pppol2tp_session *ps = l2tp_session_priv(session);
873 if (ps->sock == NULL)
874 l2tp_session_dec_refcount(session);
879 #endif /* CONFIG_L2TP_V3 */
881 /* getname() support.
883 static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
884 int *usockaddr_len, int peer)
888 struct l2tp_session *session;
889 struct l2tp_tunnel *tunnel;
890 struct sock *sk = sock->sk;
891 struct inet_sock *inet;
892 struct pppol2tp_session *pls;
897 if (sk->sk_state != PPPOX_CONNECTED)
901 session = pppol2tp_sock_to_session(sk);
905 pls = l2tp_session_priv(session);
906 tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock);
907 if (tunnel == NULL) {
912 inet = inet_sk(tunnel->sock);
913 if (tunnel->version == 2) {
914 struct sockaddr_pppol2tp sp;
917 sp.sa_family = AF_PPPOX;
918 sp.sa_protocol = PX_PROTO_OL2TP;
919 sp.pppol2tp.fd = tunnel->fd;
920 sp.pppol2tp.pid = pls->owner;
921 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
922 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
923 sp.pppol2tp.s_session = session->session_id;
924 sp.pppol2tp.d_session = session->peer_session_id;
925 sp.pppol2tp.addr.sin_family = AF_INET;
926 sp.pppol2tp.addr.sin_port = inet->inet_dport;
927 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
928 memcpy(uaddr, &sp, len);
929 } else if (tunnel->version == 3) {
930 struct sockaddr_pppol2tpv3 sp;
933 sp.sa_family = AF_PPPOX;
934 sp.sa_protocol = PX_PROTO_OL2TP;
935 sp.pppol2tp.fd = tunnel->fd;
936 sp.pppol2tp.pid = pls->owner;
937 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
938 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
939 sp.pppol2tp.s_session = session->session_id;
940 sp.pppol2tp.d_session = session->peer_session_id;
941 sp.pppol2tp.addr.sin_family = AF_INET;
942 sp.pppol2tp.addr.sin_port = inet->inet_dport;
943 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
944 memcpy(uaddr, &sp, len);
947 *usockaddr_len = len;
949 sock_put(pls->tunnel_sock);
958 /****************************************************************************
961 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
962 * sockets. However, in order to control kernel tunnel features, we allow
963 * userspace to create a special "tunnel" PPPoX socket which is used for
964 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
965 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
967 ****************************************************************************/
969 static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest,
970 struct l2tp_stats *stats)
972 dest->tx_packets = stats->tx_packets;
973 dest->tx_bytes = stats->tx_bytes;
974 dest->tx_errors = stats->tx_errors;
975 dest->rx_packets = stats->rx_packets;
976 dest->rx_bytes = stats->rx_bytes;
977 dest->rx_seq_discards = stats->rx_seq_discards;
978 dest->rx_oos_packets = stats->rx_oos_packets;
979 dest->rx_errors = stats->rx_errors;
982 /* Session ioctl helper.
984 static int pppol2tp_session_ioctl(struct l2tp_session *session,
985 unsigned int cmd, unsigned long arg)
991 struct pppol2tp_session *ps = l2tp_session_priv(session);
992 struct l2tp_tunnel *tunnel = session->tunnel;
993 struct pppol2tp_ioc_stats stats;
995 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG,
996 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
997 session->name, cmd, arg);
1005 if (!(sk->sk_state & PPPOX_CONNECTED))
1009 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1011 ifr.ifr_mtu = session->mtu;
1012 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
1015 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1016 "%s: get mtu=%d\n", session->name, session->mtu);
1022 if (!(sk->sk_state & PPPOX_CONNECTED))
1026 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1029 session->mtu = ifr.ifr_mtu;
1031 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1032 "%s: set mtu=%d\n", session->name, session->mtu);
1038 if (!(sk->sk_state & PPPOX_CONNECTED))
1042 if (put_user(session->mru, (int __user *) arg))
1045 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1046 "%s: get mru=%d\n", session->name, session->mru);
1052 if (!(sk->sk_state & PPPOX_CONNECTED))
1056 if (get_user(val, (int __user *) arg))
1060 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1061 "%s: set mru=%d\n", session->name, session->mru);
1067 if (put_user(ps->flags, (int __user *) arg))
1070 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1071 "%s: get flags=%d\n", session->name, ps->flags);
1077 if (get_user(val, (int __user *) arg))
1080 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1081 "%s: set flags=%d\n", session->name, ps->flags);
1085 case PPPIOCGL2TPSTATS:
1087 if (!(sk->sk_state & PPPOX_CONNECTED))
1090 memset(&stats, 0, sizeof(stats));
1091 stats.tunnel_id = tunnel->tunnel_id;
1092 stats.session_id = session->session_id;
1093 pppol2tp_copy_stats(&stats, &session->stats);
1094 if (copy_to_user((void __user *) arg, &stats,
1097 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1098 "%s: get L2TP stats\n", session->name);
1112 /* Tunnel ioctl helper.
1114 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1115 * specifies a session_id, the session ioctl handler is called. This allows an
1116 * application to retrieve session stats via a tunnel socket.
1118 static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
1119 unsigned int cmd, unsigned long arg)
1123 struct pppol2tp_ioc_stats stats;
1125 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG,
1126 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1127 tunnel->name, cmd, arg);
1133 case PPPIOCGL2TPSTATS:
1135 if (!(sk->sk_state & PPPOX_CONNECTED))
1138 if (copy_from_user(&stats, (void __user *) arg,
1143 if (stats.session_id != 0) {
1144 /* resend to session ioctl handler */
1145 struct l2tp_session *session =
1146 l2tp_session_find(sock_net(sk), tunnel, stats.session_id);
1147 if (session != NULL)
1148 err = pppol2tp_session_ioctl(session, cmd, arg);
1154 stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
1156 pppol2tp_copy_stats(&stats, &tunnel->stats);
1157 if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) {
1161 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1162 "%s: get L2TP stats\n", tunnel->name);
1176 /* Main ioctl() handler.
1177 * Dispatch to tunnel or session helpers depending on the socket.
1179 static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
1182 struct sock *sk = sock->sk;
1183 struct l2tp_session *session;
1184 struct l2tp_tunnel *tunnel;
1185 struct pppol2tp_session *ps;
1192 if (sock_flag(sk, SOCK_DEAD) != 0)
1196 if ((sk->sk_user_data == NULL) ||
1197 (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
1200 /* Get session context from the socket */
1202 session = pppol2tp_sock_to_session(sk);
1203 if (session == NULL)
1206 /* Special case: if session's session_id is zero, treat ioctl as a
1209 ps = l2tp_session_priv(session);
1210 if ((session->session_id == 0) &&
1211 (session->peer_session_id == 0)) {
1213 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1217 err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
1218 sock_put(ps->tunnel_sock);
1222 err = pppol2tp_session_ioctl(session, cmd, arg);
1230 /*****************************************************************************
1231 * setsockopt() / getsockopt() support.
1233 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1234 * sockets. In order to control kernel tunnel features, we allow userspace to
1235 * create a special "tunnel" PPPoX socket which is used for control only.
1236 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1237 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1238 *****************************************************************************/
1240 /* Tunnel setsockopt() helper.
1242 static int pppol2tp_tunnel_setsockopt(struct sock *sk,
1243 struct l2tp_tunnel *tunnel,
1244 int optname, int val)
1249 case PPPOL2TP_SO_DEBUG:
1250 tunnel->debug = val;
1251 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1252 "%s: set debug=%x\n", tunnel->name, tunnel->debug);
1263 /* Session setsockopt helper.
1265 static int pppol2tp_session_setsockopt(struct sock *sk,
1266 struct l2tp_session *session,
1267 int optname, int val)
1270 struct pppol2tp_session *ps = l2tp_session_priv(session);
1273 case PPPOL2TP_SO_RECVSEQ:
1274 if ((val != 0) && (val != 1)) {
1278 session->recv_seq = val ? -1 : 0;
1279 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1280 "%s: set recv_seq=%d\n", session->name, session->recv_seq);
1283 case PPPOL2TP_SO_SENDSEQ:
1284 if ((val != 0) && (val != 1)) {
1288 session->send_seq = val ? -1 : 0;
1290 struct sock *ssk = ps->sock;
1291 struct pppox_sock *po = pppox_sk(ssk);
1292 po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
1293 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1295 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1296 "%s: set send_seq=%d\n", session->name, session->send_seq);
1299 case PPPOL2TP_SO_LNSMODE:
1300 if ((val != 0) && (val != 1)) {
1304 session->lns_mode = val ? -1 : 0;
1305 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1306 "%s: set lns_mode=%d\n", session->name, session->lns_mode);
1309 case PPPOL2TP_SO_DEBUG:
1310 session->debug = val;
1311 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1312 "%s: set debug=%x\n", session->name, session->debug);
1315 case PPPOL2TP_SO_REORDERTO:
1316 session->reorder_timeout = msecs_to_jiffies(val);
1317 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1318 "%s: set reorder_timeout=%d\n", session->name, session->reorder_timeout);
1329 /* Main setsockopt() entry point.
1330 * Does API checks, then calls either the tunnel or session setsockopt
1331 * handler, according to whether the PPPoL2TP socket is a for a regular
1332 * session or the special tunnel type.
1334 static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
1335 char __user *optval, unsigned int optlen)
1337 struct sock *sk = sock->sk;
1338 struct l2tp_session *session;
1339 struct l2tp_tunnel *tunnel;
1340 struct pppol2tp_session *ps;
1344 if (level != SOL_PPPOL2TP)
1345 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
1347 if (optlen < sizeof(int))
1350 if (get_user(val, (int __user *)optval))
1354 if (sk->sk_user_data == NULL)
1357 /* Get session context from the socket */
1359 session = pppol2tp_sock_to_session(sk);
1360 if (session == NULL)
1363 /* Special case: if session_id == 0x0000, treat as operation on tunnel
1365 ps = l2tp_session_priv(session);
1366 if ((session->session_id == 0) &&
1367 (session->peer_session_id == 0)) {
1369 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1373 err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
1374 sock_put(ps->tunnel_sock);
1376 err = pppol2tp_session_setsockopt(sk, session, optname, val);
1386 /* Tunnel getsockopt helper. Called with sock locked.
1388 static int pppol2tp_tunnel_getsockopt(struct sock *sk,
1389 struct l2tp_tunnel *tunnel,
1390 int optname, int *val)
1395 case PPPOL2TP_SO_DEBUG:
1396 *val = tunnel->debug;
1397 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1398 "%s: get debug=%x\n", tunnel->name, tunnel->debug);
1409 /* Session getsockopt helper. Called with sock locked.
1411 static int pppol2tp_session_getsockopt(struct sock *sk,
1412 struct l2tp_session *session,
1413 int optname, int *val)
1418 case PPPOL2TP_SO_RECVSEQ:
1419 *val = session->recv_seq;
1420 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1421 "%s: get recv_seq=%d\n", session->name, *val);
1424 case PPPOL2TP_SO_SENDSEQ:
1425 *val = session->send_seq;
1426 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1427 "%s: get send_seq=%d\n", session->name, *val);
1430 case PPPOL2TP_SO_LNSMODE:
1431 *val = session->lns_mode;
1432 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1433 "%s: get lns_mode=%d\n", session->name, *val);
1436 case PPPOL2TP_SO_DEBUG:
1437 *val = session->debug;
1438 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1439 "%s: get debug=%d\n", session->name, *val);
1442 case PPPOL2TP_SO_REORDERTO:
1443 *val = (int) jiffies_to_msecs(session->reorder_timeout);
1444 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1445 "%s: get reorder_timeout=%d\n", session->name, *val);
1455 /* Main getsockopt() entry point.
1456 * Does API checks, then calls either the tunnel or session getsockopt
1457 * handler, according to whether the PPPoX socket is a for a regular session
1458 * or the special tunnel type.
1460 static int pppol2tp_getsockopt(struct socket *sock, int level,
1461 int optname, char __user *optval, int __user *optlen)
1463 struct sock *sk = sock->sk;
1464 struct l2tp_session *session;
1465 struct l2tp_tunnel *tunnel;
1468 struct pppol2tp_session *ps;
1470 if (level != SOL_PPPOL2TP)
1471 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1473 if (get_user(len, (int __user *) optlen))
1476 len = min_t(unsigned int, len, sizeof(int));
1482 if (sk->sk_user_data == NULL)
1485 /* Get the session context */
1487 session = pppol2tp_sock_to_session(sk);
1488 if (session == NULL)
1491 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1492 ps = l2tp_session_priv(session);
1493 if ((session->session_id == 0) &&
1494 (session->peer_session_id == 0)) {
1496 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1500 err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
1501 sock_put(ps->tunnel_sock);
1503 err = pppol2tp_session_getsockopt(sk, session, optname, &val);
1506 if (put_user(len, (int __user *) optlen))
1509 if (copy_to_user((void __user *) optval, &val, len))
1520 /*****************************************************************************
1521 * /proc filesystem for debug
1522 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1523 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1524 *****************************************************************************/
1526 static unsigned int pppol2tp_net_id;
1528 #ifdef CONFIG_PROC_FS
1530 struct pppol2tp_seq_data {
1531 struct seq_net_private p;
1532 int tunnel_idx; /* current tunnel */
1533 int session_idx; /* index of session within current tunnel */
1534 struct l2tp_tunnel *tunnel;
1535 struct l2tp_session *session; /* NULL means get next tunnel */
1538 static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
1541 pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx);
1544 if (pd->tunnel == NULL)
1547 /* Ignore L2TPv3 tunnels */
1548 if (pd->tunnel->version < 3)
1553 static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
1555 pd->session = l2tp_session_find_nth(pd->tunnel, pd->session_idx);
1558 if (pd->session == NULL) {
1559 pd->session_idx = 0;
1560 pppol2tp_next_tunnel(net, pd);
1564 static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
1566 struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
1573 BUG_ON(m->private == NULL);
1575 net = seq_file_net(m);
1577 if (pd->tunnel == NULL)
1578 pppol2tp_next_tunnel(net, pd);
1580 pppol2tp_next_session(net, pd);
1582 /* NULL tunnel and session indicates end of list */
1583 if ((pd->tunnel == NULL) && (pd->session == NULL))
1590 static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
1596 static void pppol2tp_seq_stop(struct seq_file *p, void *v)
1601 static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
1603 struct l2tp_tunnel *tunnel = v;
1605 seq_printf(m, "\nTUNNEL '%s', %c %d\n",
1607 (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
1608 atomic_read(&tunnel->ref_count) - 1);
1609 seq_printf(m, " %08x %llu/%llu/%llu %llu/%llu/%llu\n",
1611 (unsigned long long)tunnel->stats.tx_packets,
1612 (unsigned long long)tunnel->stats.tx_bytes,
1613 (unsigned long long)tunnel->stats.tx_errors,
1614 (unsigned long long)tunnel->stats.rx_packets,
1615 (unsigned long long)tunnel->stats.rx_bytes,
1616 (unsigned long long)tunnel->stats.rx_errors);
1619 static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
1621 struct l2tp_session *session = v;
1622 struct l2tp_tunnel *tunnel = session->tunnel;
1623 struct pppol2tp_session *ps = l2tp_session_priv(session);
1624 struct pppox_sock *po = pppox_sk(ps->sock);
1629 struct inet_sock *inet = inet_sk(tunnel->sock);
1630 ip = ntohl(inet->inet_saddr);
1631 port = ntohs(inet->inet_sport);
1634 seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
1635 "%04X/%04X %d %c\n",
1636 session->name, ip, port,
1638 session->session_id,
1639 tunnel->peer_tunnel_id,
1640 session->peer_session_id,
1642 (session == ps->sock->sk_user_data) ?
1644 seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n",
1645 session->mtu, session->mru,
1646 session->recv_seq ? 'R' : '-',
1647 session->send_seq ? 'S' : '-',
1648 session->lns_mode ? "LNS" : "LAC",
1650 jiffies_to_msecs(session->reorder_timeout));
1651 seq_printf(m, " %hu/%hu %llu/%llu/%llu %llu/%llu/%llu\n",
1652 session->nr, session->ns,
1653 (unsigned long long)session->stats.tx_packets,
1654 (unsigned long long)session->stats.tx_bytes,
1655 (unsigned long long)session->stats.tx_errors,
1656 (unsigned long long)session->stats.rx_packets,
1657 (unsigned long long)session->stats.rx_bytes,
1658 (unsigned long long)session->stats.rx_errors);
1661 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
1664 static int pppol2tp_seq_show(struct seq_file *m, void *v)
1666 struct pppol2tp_seq_data *pd = v;
1668 /* display header on line 1 */
1669 if (v == SEQ_START_TOKEN) {
1670 seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
1671 seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
1672 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1673 seq_puts(m, " SESSION name, addr/port src-tid/sid "
1674 "dest-tid/sid state user-data-ok\n");
1675 seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1676 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1680 /* Show the tunnel or session context.
1682 if (pd->session == NULL)
1683 pppol2tp_seq_tunnel_show(m, pd->tunnel);
1685 pppol2tp_seq_session_show(m, pd->session);
1691 static const struct seq_operations pppol2tp_seq_ops = {
1692 .start = pppol2tp_seq_start,
1693 .next = pppol2tp_seq_next,
1694 .stop = pppol2tp_seq_stop,
1695 .show = pppol2tp_seq_show,
1698 /* Called when our /proc file is opened. We allocate data for use when
1699 * iterating our tunnel / session contexts and store it in the private
1700 * data of the seq_file.
1702 static int pppol2tp_proc_open(struct inode *inode, struct file *file)
1704 return seq_open_net(inode, file, &pppol2tp_seq_ops,
1705 sizeof(struct pppol2tp_seq_data));
1708 static const struct file_operations pppol2tp_proc_fops = {
1709 .owner = THIS_MODULE,
1710 .open = pppol2tp_proc_open,
1712 .llseek = seq_lseek,
1713 .release = seq_release_net,
1716 #endif /* CONFIG_PROC_FS */
1718 /*****************************************************************************
1720 *****************************************************************************/
1722 static __net_init int pppol2tp_init_net(struct net *net)
1724 struct proc_dir_entry *pde;
1727 pde = proc_net_fops_create(net, "pppol2tp", S_IRUGO, &pppol2tp_proc_fops);
1737 static __net_exit void pppol2tp_exit_net(struct net *net)
1739 proc_net_remove(net, "pppol2tp");
1742 static struct pernet_operations pppol2tp_net_ops = {
1743 .init = pppol2tp_init_net,
1744 .exit = pppol2tp_exit_net,
1745 .id = &pppol2tp_net_id,
1748 /*****************************************************************************
1750 *****************************************************************************/
1752 static const struct proto_ops pppol2tp_ops = {
1754 .owner = THIS_MODULE,
1755 .release = pppol2tp_release,
1756 .bind = sock_no_bind,
1757 .connect = pppol2tp_connect,
1758 .socketpair = sock_no_socketpair,
1759 .accept = sock_no_accept,
1760 .getname = pppol2tp_getname,
1761 .poll = datagram_poll,
1762 .listen = sock_no_listen,
1763 .shutdown = sock_no_shutdown,
1764 .setsockopt = pppol2tp_setsockopt,
1765 .getsockopt = pppol2tp_getsockopt,
1766 .sendmsg = pppol2tp_sendmsg,
1767 .recvmsg = pppol2tp_recvmsg,
1768 .mmap = sock_no_mmap,
1769 .ioctl = pppox_ioctl,
1772 static const struct pppox_proto pppol2tp_proto = {
1773 .create = pppol2tp_create,
1774 .ioctl = pppol2tp_ioctl,
1775 .owner = THIS_MODULE,
1778 #ifdef CONFIG_L2TP_V3
1780 static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = {
1781 .session_create = pppol2tp_session_create,
1782 .session_delete = pppol2tp_session_delete,
1785 #endif /* CONFIG_L2TP_V3 */
1787 static int __init pppol2tp_init(void)
1791 err = register_pernet_device(&pppol2tp_net_ops);
1795 err = proto_register(&pppol2tp_sk_proto, 0);
1797 goto out_unregister_pppol2tp_pernet;
1799 err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
1801 goto out_unregister_pppol2tp_proto;
1803 #ifdef CONFIG_L2TP_V3
1804 err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops);
1806 goto out_unregister_pppox;
1809 printk(KERN_INFO "PPPoL2TP kernel driver, %s\n",
1810 PPPOL2TP_DRV_VERSION);
1815 #ifdef CONFIG_L2TP_V3
1816 out_unregister_pppox:
1817 unregister_pppox_proto(PX_PROTO_OL2TP);
1819 out_unregister_pppol2tp_proto:
1820 proto_unregister(&pppol2tp_sk_proto);
1821 out_unregister_pppol2tp_pernet:
1822 unregister_pernet_device(&pppol2tp_net_ops);
1826 static void __exit pppol2tp_exit(void)
1828 #ifdef CONFIG_L2TP_V3
1829 l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP);
1831 unregister_pppox_proto(PX_PROTO_OL2TP);
1832 proto_unregister(&pppol2tp_sk_proto);
1833 unregister_pernet_device(&pppol2tp_net_ops);
1836 module_init(pppol2tp_init);
1837 module_exit(pppol2tp_exit);
1839 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1840 MODULE_DESCRIPTION("PPP over L2TP over UDP");
1841 MODULE_LICENSE("GPL");
1842 MODULE_VERSION(PPPOL2TP_DRV_VERSION);