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 <linux/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)
204 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
205 flags & MSG_DONTWAIT, &err);
211 else if (len < skb->len)
212 msg->msg_flags |= MSG_TRUNC;
214 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len);
215 if (likely(err == 0))
223 static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
225 struct pppol2tp_session *ps = l2tp_session_priv(session);
226 struct sock *sk = NULL;
228 /* If the socket is bound, send it in to PPP's input queue. Otherwise
229 * queue it on the session socket.
235 if (sk->sk_state & PPPOX_BOUND) {
236 struct pppox_sock *po;
237 PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG,
238 "%s: recv %d byte data frame, passing to ppp\n",
239 session->name, data_len);
241 /* We need to forget all info related to the L2TP packet
242 * gathered in the skb as we are going to reuse the same
243 * skb for the inner packet.
245 * - reset xfrm (IPSec) information as it applies to
246 * the outer L2TP packet and not to the inner one
247 * - release the dst to force a route lookup on the inner
248 * IP packet since skb->dst currently points to the dst
250 * - reset netfilter information as it doesn't apply
251 * to the inner packet either
258 ppp_input(&po->chan, skb);
260 PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_INFO,
261 "%s: socket not bound\n", session->name);
263 /* Not bound. Nothing we can do, so discard. */
264 session->stats.rx_errors++;
271 PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_INFO,
272 "%s: no socket\n", session->name);
276 static void pppol2tp_session_sock_hold(struct l2tp_session *session)
278 struct pppol2tp_session *ps = l2tp_session_priv(session);
284 static void pppol2tp_session_sock_put(struct l2tp_session *session)
286 struct pppol2tp_session *ps = l2tp_session_priv(session);
292 /************************************************************************
294 ***********************************************************************/
296 /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here
297 * when a user application does a sendmsg() on the session socket. L2TP and
298 * PPP headers must be inserted into the user's data.
300 static int pppol2tp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
303 static const unsigned char ppph[2] = { 0xff, 0x03 };
304 struct sock *sk = sock->sk;
307 struct l2tp_session *session;
308 struct l2tp_tunnel *tunnel;
309 struct pppol2tp_session *ps;
313 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
316 /* Get session and tunnel contexts */
318 session = pppol2tp_sock_to_session(sk);
322 ps = l2tp_session_priv(session);
323 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
327 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
329 /* Allocate a socket buffer */
331 skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) +
332 uhlen + session->hdr_len +
333 sizeof(ppph) + total_len,
336 goto error_put_sess_tun;
338 /* Reserve space for headers. */
339 skb_reserve(skb, NET_SKB_PAD);
340 skb_reset_network_header(skb);
341 skb_reserve(skb, sizeof(struct iphdr));
342 skb_reset_transport_header(skb);
343 skb_reserve(skb, uhlen);
346 skb->data[0] = ppph[0];
347 skb->data[1] = ppph[1];
350 /* Copy user data into skb */
351 error = memcpy_fromiovec(skb_put(skb, total_len), m->msg_iov,
355 goto error_put_sess_tun;
359 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;
401 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
404 /* Get session and tunnel contexts from the socket */
405 session = pppol2tp_sock_to_session(sk);
409 ps = l2tp_session_priv(session);
410 sk_tun = ps->tunnel_sock;
413 tunnel = l2tp_sock_to_tunnel(sk_tun);
417 old_headroom = skb_headroom(skb);
418 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
419 headroom = NET_SKB_PAD +
420 sizeof(struct iphdr) + /* IP header */
421 uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */
422 session->hdr_len + /* L2TP header */
423 sizeof(ppph); /* PPP header */
424 if (skb_cow_head(skb, headroom))
425 goto abort_put_sess_tun;
427 new_headroom = skb_headroom(skb);
428 skb->truesize += new_headroom - old_headroom;
430 /* Setup PPP header */
431 __skb_push(skb, sizeof(ppph));
432 skb->data[0] = ppph[0];
433 skb->data[1] = ppph[1];
436 l2tp_xmit_skb(session, skb, session->hdr_len);
448 /* Free the original skb */
453 /*****************************************************************************
454 * Session (and tunnel control) socket create/destroy.
455 *****************************************************************************/
457 /* Called by l2tp_core when a session socket is being closed.
459 static void pppol2tp_session_close(struct l2tp_session *session)
461 struct pppol2tp_session *ps = l2tp_session_priv(session);
462 struct sock *sk = ps->sock;
465 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
467 if (session->session_id == 0)
473 if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) {
474 pppox_unbind_sock(sk);
475 sk->sk_state = PPPOX_DEAD;
476 sk->sk_state_change(sk);
479 /* Purge any queued data */
480 skb_queue_purge(&sk->sk_receive_queue);
481 skb_queue_purge(&sk->sk_write_queue);
482 while ((skb = skb_dequeue(&session->reorder_q))) {
494 /* Really kill the session socket. (Called from sock_put() if
497 static void pppol2tp_session_destruct(struct sock *sk)
499 struct l2tp_session *session;
501 if (sk->sk_user_data != NULL) {
502 session = sk->sk_user_data;
506 sk->sk_user_data = NULL;
507 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
508 l2tp_session_dec_refcount(session);
515 /* Called when the PPPoX socket (session) is closed.
517 static int pppol2tp_release(struct socket *sock)
519 struct sock *sk = sock->sk;
520 struct l2tp_session *session;
528 if (sock_flag(sk, SOCK_DEAD) != 0)
531 pppox_unbind_sock(sk);
533 /* Signal the death of the socket. */
534 sk->sk_state = PPPOX_DEAD;
538 session = pppol2tp_sock_to_session(sk);
540 /* Purge any queued data */
541 skb_queue_purge(&sk->sk_receive_queue);
542 skb_queue_purge(&sk->sk_write_queue);
543 if (session != NULL) {
545 while ((skb = skb_dequeue(&session->reorder_q))) {
554 /* This will delete the session context via
555 * pppol2tp_session_destruct() if the socket's refcnt drops to
567 static struct proto pppol2tp_sk_proto = {
569 .owner = THIS_MODULE,
570 .obj_size = sizeof(struct pppox_sock),
573 static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb)
577 rc = l2tp_udp_encap_recv(sk, skb);
581 return NET_RX_SUCCESS;
584 /* socket() handler. Initialize a new struct sock.
586 static int pppol2tp_create(struct net *net, struct socket *sock)
591 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto);
595 sock_init_data(sock, sk);
597 sock->state = SS_UNCONNECTED;
598 sock->ops = &pppol2tp_ops;
600 sk->sk_backlog_rcv = pppol2tp_backlog_recv;
601 sk->sk_protocol = PX_PROTO_OL2TP;
602 sk->sk_family = PF_PPPOX;
603 sk->sk_state = PPPOX_NONE;
604 sk->sk_type = SOCK_STREAM;
605 sk->sk_destruct = pppol2tp_session_destruct;
613 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
614 static void pppol2tp_show(struct seq_file *m, void *arg)
616 struct l2tp_session *session = arg;
617 struct pppol2tp_session *ps = l2tp_session_priv(session);
620 struct pppox_sock *po = pppox_sk(ps->sock);
622 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
627 /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
629 static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
630 int sockaddr_len, int flags)
632 struct sock *sk = sock->sk;
633 struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr;
634 struct sockaddr_pppol2tpv3 *sp3 = (struct sockaddr_pppol2tpv3 *) uservaddr;
635 struct pppox_sock *po = pppox_sk(sk);
636 struct l2tp_session *session = NULL;
637 struct l2tp_tunnel *tunnel;
638 struct pppol2tp_session *ps;
639 struct dst_entry *dst;
640 struct l2tp_session_cfg cfg = { 0, };
642 u32 tunnel_id, peer_tunnel_id;
643 u32 session_id, peer_session_id;
650 if (sp->sa_protocol != PX_PROTO_OL2TP)
653 /* Check for already bound sockets */
655 if (sk->sk_state & PPPOX_CONNECTED)
658 /* We don't supporting rebinding anyway */
660 if (sk->sk_user_data)
661 goto end; /* socket is already attached */
663 /* Get params from socket address. Handle L2TPv2 and L2TPv3 */
664 if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) {
665 fd = sp->pppol2tp.fd;
666 tunnel_id = sp->pppol2tp.s_tunnel;
667 peer_tunnel_id = sp->pppol2tp.d_tunnel;
668 session_id = sp->pppol2tp.s_session;
669 peer_session_id = sp->pppol2tp.d_session;
670 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) {
672 fd = sp3->pppol2tp.fd;
673 tunnel_id = sp3->pppol2tp.s_tunnel;
674 peer_tunnel_id = sp3->pppol2tp.d_tunnel;
675 session_id = sp3->pppol2tp.s_session;
676 peer_session_id = sp3->pppol2tp.d_session;
679 goto end; /* bad socket address */
682 /* Don't bind if tunnel_id is 0 */
687 tunnel = l2tp_tunnel_find(sock_net(sk), tunnel_id);
689 /* Special case: create tunnel context if session_id and
690 * peer_session_id is 0. Otherwise look up tunnel using supplied
693 if ((session_id == 0) && (peer_session_id == 0)) {
694 if (tunnel == NULL) {
695 struct l2tp_tunnel_cfg tcfg = {
696 .encap = L2TP_ENCAPTYPE_UDP,
699 error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel);
704 /* Error if we can't find the tunnel */
709 /* Error if socket is not prepped */
710 if (tunnel->sock == NULL)
714 if (tunnel->recv_payload_hook == NULL)
715 tunnel->recv_payload_hook = pppol2tp_recv_payload_hook;
717 if (tunnel->peer_tunnel_id == 0) {
719 tunnel->peer_tunnel_id = sp->pppol2tp.d_tunnel;
721 tunnel->peer_tunnel_id = sp3->pppol2tp.d_tunnel;
724 /* Create session if it doesn't already exist. We handle the
725 * case where a session was previously created by the netlink
726 * interface by checking that the session doesn't already have
727 * a socket and its tunnel socket are what we expect. If any
728 * of those checks fail, return EEXIST to the caller.
730 session = l2tp_session_find(sock_net(sk), tunnel, session_id);
731 if (session == NULL) {
732 /* Default MTU must allow space for UDP/L2TP/PPP
735 cfg.mtu = cfg.mru = 1500 - PPPOL2TP_HEADER_OVERHEAD;
737 /* Allocate and initialize a new session context. */
738 session = l2tp_session_create(sizeof(struct pppol2tp_session),
740 peer_session_id, &cfg);
741 if (session == NULL) {
746 ps = l2tp_session_priv(session);
748 if (ps->sock != NULL)
751 /* consistency checks */
752 if (ps->tunnel_sock != tunnel->sock)
756 /* Associate session with its PPPoL2TP socket */
757 ps = l2tp_session_priv(session);
758 ps->owner = current->pid;
760 ps->tunnel_sock = tunnel->sock;
762 session->recv_skb = pppol2tp_recv;
763 session->session_close = pppol2tp_session_close;
764 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
765 session->show = pppol2tp_show;
768 /* We need to know each time a skb is dropped from the reorder
771 session->ref = pppol2tp_session_sock_hold;
772 session->deref = pppol2tp_session_sock_put;
774 /* If PMTU discovery was enabled, use the MTU that was discovered */
775 dst = sk_dst_get(sk);
777 u32 pmtu = dst_mtu(__sk_dst_get(sk));
779 session->mtu = session->mru = pmtu -
780 PPPOL2TP_HEADER_OVERHEAD;
784 /* Special case: if source & dest session_id == 0x0000, this
785 * socket is being created to manage the tunnel. Just set up
786 * the internal context for use by ioctl() and sockopt()
789 if ((session->session_id == 0) &&
790 (session->peer_session_id == 0)) {
795 /* The only header we need to worry about is the L2TP
796 * header. This size is different depending on whether
797 * sequence numbers are enabled for the data channel.
799 po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
801 po->chan.private = sk;
802 po->chan.ops = &pppol2tp_chan_ops;
803 po->chan.mtu = session->mtu;
805 error = ppp_register_net_channel(sock_net(sk), &po->chan);
810 /* This is how we get the session context from the socket. */
811 sk->sk_user_data = session;
812 sk->sk_state = PPPOX_CONNECTED;
813 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
814 "%s: created\n", session->name);
822 #ifdef CONFIG_L2TP_V3
824 /* Called when creating sessions via the netlink interface.
826 static int pppol2tp_session_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg)
829 struct l2tp_tunnel *tunnel;
830 struct l2tp_session *session;
831 struct pppol2tp_session *ps;
833 tunnel = l2tp_tunnel_find(net, tunnel_id);
835 /* Error if we can't find the tunnel */
840 /* Error if tunnel socket is not prepped */
841 if (tunnel->sock == NULL)
844 /* Check that this session doesn't already exist */
846 session = l2tp_session_find(net, tunnel, session_id);
850 /* Default MTU values. */
852 cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
856 /* Allocate and initialize a new session context. */
858 session = l2tp_session_create(sizeof(struct pppol2tp_session),
860 peer_session_id, cfg);
864 ps = l2tp_session_priv(session);
865 ps->tunnel_sock = tunnel->sock;
867 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
868 "%s: created\n", session->name);
876 /* Called when deleting sessions via the netlink interface.
878 static int pppol2tp_session_delete(struct l2tp_session *session)
880 struct pppol2tp_session *ps = l2tp_session_priv(session);
882 if (ps->sock == NULL)
883 l2tp_session_dec_refcount(session);
888 #endif /* CONFIG_L2TP_V3 */
890 /* getname() support.
892 static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
893 int *usockaddr_len, int peer)
897 struct l2tp_session *session;
898 struct l2tp_tunnel *tunnel;
899 struct sock *sk = sock->sk;
900 struct inet_sock *inet;
901 struct pppol2tp_session *pls;
906 if (sk->sk_state != PPPOX_CONNECTED)
910 session = pppol2tp_sock_to_session(sk);
914 pls = l2tp_session_priv(session);
915 tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock);
916 if (tunnel == NULL) {
921 inet = inet_sk(tunnel->sock);
922 if (tunnel->version == 2) {
923 struct sockaddr_pppol2tp sp;
926 sp.sa_family = AF_PPPOX;
927 sp.sa_protocol = PX_PROTO_OL2TP;
928 sp.pppol2tp.fd = tunnel->fd;
929 sp.pppol2tp.pid = pls->owner;
930 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
931 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
932 sp.pppol2tp.s_session = session->session_id;
933 sp.pppol2tp.d_session = session->peer_session_id;
934 sp.pppol2tp.addr.sin_family = AF_INET;
935 sp.pppol2tp.addr.sin_port = inet->inet_dport;
936 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
937 memcpy(uaddr, &sp, len);
938 } else if (tunnel->version == 3) {
939 struct sockaddr_pppol2tpv3 sp;
942 sp.sa_family = AF_PPPOX;
943 sp.sa_protocol = PX_PROTO_OL2TP;
944 sp.pppol2tp.fd = tunnel->fd;
945 sp.pppol2tp.pid = pls->owner;
946 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
947 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
948 sp.pppol2tp.s_session = session->session_id;
949 sp.pppol2tp.d_session = session->peer_session_id;
950 sp.pppol2tp.addr.sin_family = AF_INET;
951 sp.pppol2tp.addr.sin_port = inet->inet_dport;
952 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
953 memcpy(uaddr, &sp, len);
956 *usockaddr_len = len;
958 sock_put(pls->tunnel_sock);
967 /****************************************************************************
970 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
971 * sockets. However, in order to control kernel tunnel features, we allow
972 * userspace to create a special "tunnel" PPPoX socket which is used for
973 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
974 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
976 ****************************************************************************/
978 static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest,
979 struct l2tp_stats *stats)
981 dest->tx_packets = stats->tx_packets;
982 dest->tx_bytes = stats->tx_bytes;
983 dest->tx_errors = stats->tx_errors;
984 dest->rx_packets = stats->rx_packets;
985 dest->rx_bytes = stats->rx_bytes;
986 dest->rx_seq_discards = stats->rx_seq_discards;
987 dest->rx_oos_packets = stats->rx_oos_packets;
988 dest->rx_errors = stats->rx_errors;
991 /* Session ioctl helper.
993 static int pppol2tp_session_ioctl(struct l2tp_session *session,
994 unsigned int cmd, unsigned long arg)
1000 struct pppol2tp_session *ps = l2tp_session_priv(session);
1001 struct l2tp_tunnel *tunnel = session->tunnel;
1002 struct pppol2tp_ioc_stats stats;
1004 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG,
1005 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
1006 session->name, cmd, arg);
1014 if (!(sk->sk_state & PPPOX_CONNECTED))
1018 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1020 ifr.ifr_mtu = session->mtu;
1021 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
1024 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1025 "%s: get mtu=%d\n", session->name, session->mtu);
1031 if (!(sk->sk_state & PPPOX_CONNECTED))
1035 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1038 session->mtu = ifr.ifr_mtu;
1040 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1041 "%s: set mtu=%d\n", session->name, session->mtu);
1047 if (!(sk->sk_state & PPPOX_CONNECTED))
1051 if (put_user(session->mru, (int __user *) arg))
1054 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1055 "%s: get mru=%d\n", session->name, session->mru);
1061 if (!(sk->sk_state & PPPOX_CONNECTED))
1065 if (get_user(val, (int __user *) arg))
1069 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1070 "%s: set mru=%d\n", session->name, session->mru);
1076 if (put_user(ps->flags, (int __user *) arg))
1079 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1080 "%s: get flags=%d\n", session->name, ps->flags);
1086 if (get_user(val, (int __user *) arg))
1089 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1090 "%s: set flags=%d\n", session->name, ps->flags);
1094 case PPPIOCGL2TPSTATS:
1096 if (!(sk->sk_state & PPPOX_CONNECTED))
1099 memset(&stats, 0, sizeof(stats));
1100 stats.tunnel_id = tunnel->tunnel_id;
1101 stats.session_id = session->session_id;
1102 pppol2tp_copy_stats(&stats, &session->stats);
1103 if (copy_to_user((void __user *) arg, &stats,
1106 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1107 "%s: get L2TP stats\n", session->name);
1121 /* Tunnel ioctl helper.
1123 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1124 * specifies a session_id, the session ioctl handler is called. This allows an
1125 * application to retrieve session stats via a tunnel socket.
1127 static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
1128 unsigned int cmd, unsigned long arg)
1132 struct pppol2tp_ioc_stats stats;
1134 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG,
1135 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1136 tunnel->name, cmd, arg);
1142 case PPPIOCGL2TPSTATS:
1144 if (!(sk->sk_state & PPPOX_CONNECTED))
1147 if (copy_from_user(&stats, (void __user *) arg,
1152 if (stats.session_id != 0) {
1153 /* resend to session ioctl handler */
1154 struct l2tp_session *session =
1155 l2tp_session_find(sock_net(sk), tunnel, stats.session_id);
1156 if (session != NULL)
1157 err = pppol2tp_session_ioctl(session, cmd, arg);
1163 stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
1165 pppol2tp_copy_stats(&stats, &tunnel->stats);
1166 if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) {
1170 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1171 "%s: get L2TP stats\n", tunnel->name);
1185 /* Main ioctl() handler.
1186 * Dispatch to tunnel or session helpers depending on the socket.
1188 static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
1191 struct sock *sk = sock->sk;
1192 struct l2tp_session *session;
1193 struct l2tp_tunnel *tunnel;
1194 struct pppol2tp_session *ps;
1201 if (sock_flag(sk, SOCK_DEAD) != 0)
1205 if ((sk->sk_user_data == NULL) ||
1206 (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
1209 /* Get session context from the socket */
1211 session = pppol2tp_sock_to_session(sk);
1212 if (session == NULL)
1215 /* Special case: if session's session_id is zero, treat ioctl as a
1218 ps = l2tp_session_priv(session);
1219 if ((session->session_id == 0) &&
1220 (session->peer_session_id == 0)) {
1222 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1226 err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
1227 sock_put(ps->tunnel_sock);
1231 err = pppol2tp_session_ioctl(session, cmd, arg);
1239 /*****************************************************************************
1240 * setsockopt() / getsockopt() support.
1242 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1243 * sockets. In order to control kernel tunnel features, we allow userspace to
1244 * create a special "tunnel" PPPoX socket which is used for control only.
1245 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1246 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1247 *****************************************************************************/
1249 /* Tunnel setsockopt() helper.
1251 static int pppol2tp_tunnel_setsockopt(struct sock *sk,
1252 struct l2tp_tunnel *tunnel,
1253 int optname, int val)
1258 case PPPOL2TP_SO_DEBUG:
1259 tunnel->debug = val;
1260 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1261 "%s: set debug=%x\n", tunnel->name, tunnel->debug);
1272 /* Session setsockopt helper.
1274 static int pppol2tp_session_setsockopt(struct sock *sk,
1275 struct l2tp_session *session,
1276 int optname, int val)
1279 struct pppol2tp_session *ps = l2tp_session_priv(session);
1282 case PPPOL2TP_SO_RECVSEQ:
1283 if ((val != 0) && (val != 1)) {
1287 session->recv_seq = val ? -1 : 0;
1288 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1289 "%s: set recv_seq=%d\n", session->name, session->recv_seq);
1292 case PPPOL2TP_SO_SENDSEQ:
1293 if ((val != 0) && (val != 1)) {
1297 session->send_seq = val ? -1 : 0;
1299 struct sock *ssk = ps->sock;
1300 struct pppox_sock *po = pppox_sk(ssk);
1301 po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
1302 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1304 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1305 "%s: set send_seq=%d\n", session->name, session->send_seq);
1308 case PPPOL2TP_SO_LNSMODE:
1309 if ((val != 0) && (val != 1)) {
1313 session->lns_mode = val ? -1 : 0;
1314 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1315 "%s: set lns_mode=%d\n", session->name, session->lns_mode);
1318 case PPPOL2TP_SO_DEBUG:
1319 session->debug = val;
1320 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1321 "%s: set debug=%x\n", session->name, session->debug);
1324 case PPPOL2TP_SO_REORDERTO:
1325 session->reorder_timeout = msecs_to_jiffies(val);
1326 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1327 "%s: set reorder_timeout=%d\n", session->name, session->reorder_timeout);
1338 /* Main setsockopt() entry point.
1339 * Does API checks, then calls either the tunnel or session setsockopt
1340 * handler, according to whether the PPPoL2TP socket is a for a regular
1341 * session or the special tunnel type.
1343 static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
1344 char __user *optval, unsigned int optlen)
1346 struct sock *sk = sock->sk;
1347 struct l2tp_session *session;
1348 struct l2tp_tunnel *tunnel;
1349 struct pppol2tp_session *ps;
1353 if (level != SOL_PPPOL2TP)
1354 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
1356 if (optlen < sizeof(int))
1359 if (get_user(val, (int __user *)optval))
1363 if (sk->sk_user_data == NULL)
1366 /* Get session context from the socket */
1368 session = pppol2tp_sock_to_session(sk);
1369 if (session == NULL)
1372 /* Special case: if session_id == 0x0000, treat as operation on tunnel
1374 ps = l2tp_session_priv(session);
1375 if ((session->session_id == 0) &&
1376 (session->peer_session_id == 0)) {
1378 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1382 err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
1383 sock_put(ps->tunnel_sock);
1385 err = pppol2tp_session_setsockopt(sk, session, optname, val);
1395 /* Tunnel getsockopt helper. Called with sock locked.
1397 static int pppol2tp_tunnel_getsockopt(struct sock *sk,
1398 struct l2tp_tunnel *tunnel,
1399 int optname, int *val)
1404 case PPPOL2TP_SO_DEBUG:
1405 *val = tunnel->debug;
1406 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1407 "%s: get debug=%x\n", tunnel->name, tunnel->debug);
1418 /* Session getsockopt helper. Called with sock locked.
1420 static int pppol2tp_session_getsockopt(struct sock *sk,
1421 struct l2tp_session *session,
1422 int optname, int *val)
1427 case PPPOL2TP_SO_RECVSEQ:
1428 *val = session->recv_seq;
1429 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1430 "%s: get recv_seq=%d\n", session->name, *val);
1433 case PPPOL2TP_SO_SENDSEQ:
1434 *val = session->send_seq;
1435 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1436 "%s: get send_seq=%d\n", session->name, *val);
1439 case PPPOL2TP_SO_LNSMODE:
1440 *val = session->lns_mode;
1441 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1442 "%s: get lns_mode=%d\n", session->name, *val);
1445 case PPPOL2TP_SO_DEBUG:
1446 *val = session->debug;
1447 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1448 "%s: get debug=%d\n", session->name, *val);
1451 case PPPOL2TP_SO_REORDERTO:
1452 *val = (int) jiffies_to_msecs(session->reorder_timeout);
1453 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1454 "%s: get reorder_timeout=%d\n", session->name, *val);
1464 /* Main getsockopt() entry point.
1465 * Does API checks, then calls either the tunnel or session getsockopt
1466 * handler, according to whether the PPPoX socket is a for a regular session
1467 * or the special tunnel type.
1469 static int pppol2tp_getsockopt(struct socket *sock, int level,
1470 int optname, char __user *optval, int __user *optlen)
1472 struct sock *sk = sock->sk;
1473 struct l2tp_session *session;
1474 struct l2tp_tunnel *tunnel;
1477 struct pppol2tp_session *ps;
1479 if (level != SOL_PPPOL2TP)
1480 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1482 if (get_user(len, (int __user *) optlen))
1485 len = min_t(unsigned int, len, sizeof(int));
1491 if (sk->sk_user_data == NULL)
1494 /* Get the session context */
1496 session = pppol2tp_sock_to_session(sk);
1497 if (session == NULL)
1500 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1501 ps = l2tp_session_priv(session);
1502 if ((session->session_id == 0) &&
1503 (session->peer_session_id == 0)) {
1505 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1509 err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
1510 sock_put(ps->tunnel_sock);
1512 err = pppol2tp_session_getsockopt(sk, session, optname, &val);
1515 if (put_user(len, (int __user *) optlen))
1518 if (copy_to_user((void __user *) optval, &val, len))
1529 /*****************************************************************************
1530 * /proc filesystem for debug
1531 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1532 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1533 *****************************************************************************/
1535 static unsigned int pppol2tp_net_id;
1537 #ifdef CONFIG_PROC_FS
1539 struct pppol2tp_seq_data {
1540 struct seq_net_private p;
1541 int tunnel_idx; /* current tunnel */
1542 int session_idx; /* index of session within current tunnel */
1543 struct l2tp_tunnel *tunnel;
1544 struct l2tp_session *session; /* NULL means get next tunnel */
1547 static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
1550 pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx);
1553 if (pd->tunnel == NULL)
1556 /* Ignore L2TPv3 tunnels */
1557 if (pd->tunnel->version < 3)
1562 static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
1564 pd->session = l2tp_session_find_nth(pd->tunnel, pd->session_idx);
1567 if (pd->session == NULL) {
1568 pd->session_idx = 0;
1569 pppol2tp_next_tunnel(net, pd);
1573 static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
1575 struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
1582 BUG_ON(m->private == NULL);
1584 net = seq_file_net(m);
1586 if (pd->tunnel == NULL)
1587 pppol2tp_next_tunnel(net, pd);
1589 pppol2tp_next_session(net, pd);
1591 /* NULL tunnel and session indicates end of list */
1592 if ((pd->tunnel == NULL) && (pd->session == NULL))
1599 static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
1605 static void pppol2tp_seq_stop(struct seq_file *p, void *v)
1610 static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
1612 struct l2tp_tunnel *tunnel = v;
1614 seq_printf(m, "\nTUNNEL '%s', %c %d\n",
1616 (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
1617 atomic_read(&tunnel->ref_count) - 1);
1618 seq_printf(m, " %08x %llu/%llu/%llu %llu/%llu/%llu\n",
1620 (unsigned long long)tunnel->stats.tx_packets,
1621 (unsigned long long)tunnel->stats.tx_bytes,
1622 (unsigned long long)tunnel->stats.tx_errors,
1623 (unsigned long long)tunnel->stats.rx_packets,
1624 (unsigned long long)tunnel->stats.rx_bytes,
1625 (unsigned long long)tunnel->stats.rx_errors);
1628 static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
1630 struct l2tp_session *session = v;
1631 struct l2tp_tunnel *tunnel = session->tunnel;
1632 struct pppol2tp_session *ps = l2tp_session_priv(session);
1633 struct pppox_sock *po = pppox_sk(ps->sock);
1638 struct inet_sock *inet = inet_sk(tunnel->sock);
1639 ip = ntohl(inet->inet_saddr);
1640 port = ntohs(inet->inet_sport);
1643 seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
1644 "%04X/%04X %d %c\n",
1645 session->name, ip, port,
1647 session->session_id,
1648 tunnel->peer_tunnel_id,
1649 session->peer_session_id,
1651 (session == ps->sock->sk_user_data) ?
1653 seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n",
1654 session->mtu, session->mru,
1655 session->recv_seq ? 'R' : '-',
1656 session->send_seq ? 'S' : '-',
1657 session->lns_mode ? "LNS" : "LAC",
1659 jiffies_to_msecs(session->reorder_timeout));
1660 seq_printf(m, " %hu/%hu %llu/%llu/%llu %llu/%llu/%llu\n",
1661 session->nr, session->ns,
1662 (unsigned long long)session->stats.tx_packets,
1663 (unsigned long long)session->stats.tx_bytes,
1664 (unsigned long long)session->stats.tx_errors,
1665 (unsigned long long)session->stats.rx_packets,
1666 (unsigned long long)session->stats.rx_bytes,
1667 (unsigned long long)session->stats.rx_errors);
1670 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
1673 static int pppol2tp_seq_show(struct seq_file *m, void *v)
1675 struct pppol2tp_seq_data *pd = v;
1677 /* display header on line 1 */
1678 if (v == SEQ_START_TOKEN) {
1679 seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
1680 seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
1681 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1682 seq_puts(m, " SESSION name, addr/port src-tid/sid "
1683 "dest-tid/sid state user-data-ok\n");
1684 seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1685 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1689 /* Show the tunnel or session context.
1691 if (pd->session == NULL)
1692 pppol2tp_seq_tunnel_show(m, pd->tunnel);
1694 pppol2tp_seq_session_show(m, pd->session);
1700 static const struct seq_operations pppol2tp_seq_ops = {
1701 .start = pppol2tp_seq_start,
1702 .next = pppol2tp_seq_next,
1703 .stop = pppol2tp_seq_stop,
1704 .show = pppol2tp_seq_show,
1707 /* Called when our /proc file is opened. We allocate data for use when
1708 * iterating our tunnel / session contexts and store it in the private
1709 * data of the seq_file.
1711 static int pppol2tp_proc_open(struct inode *inode, struct file *file)
1713 return seq_open_net(inode, file, &pppol2tp_seq_ops,
1714 sizeof(struct pppol2tp_seq_data));
1717 static const struct file_operations pppol2tp_proc_fops = {
1718 .owner = THIS_MODULE,
1719 .open = pppol2tp_proc_open,
1721 .llseek = seq_lseek,
1722 .release = seq_release_net,
1725 #endif /* CONFIG_PROC_FS */
1727 /*****************************************************************************
1729 *****************************************************************************/
1731 static __net_init int pppol2tp_init_net(struct net *net)
1733 struct proc_dir_entry *pde;
1736 pde = proc_net_fops_create(net, "pppol2tp", S_IRUGO, &pppol2tp_proc_fops);
1746 static __net_exit void pppol2tp_exit_net(struct net *net)
1748 proc_net_remove(net, "pppol2tp");
1751 static struct pernet_operations pppol2tp_net_ops = {
1752 .init = pppol2tp_init_net,
1753 .exit = pppol2tp_exit_net,
1754 .id = &pppol2tp_net_id,
1757 /*****************************************************************************
1759 *****************************************************************************/
1761 static const struct proto_ops pppol2tp_ops = {
1763 .owner = THIS_MODULE,
1764 .release = pppol2tp_release,
1765 .bind = sock_no_bind,
1766 .connect = pppol2tp_connect,
1767 .socketpair = sock_no_socketpair,
1768 .accept = sock_no_accept,
1769 .getname = pppol2tp_getname,
1770 .poll = datagram_poll,
1771 .listen = sock_no_listen,
1772 .shutdown = sock_no_shutdown,
1773 .setsockopt = pppol2tp_setsockopt,
1774 .getsockopt = pppol2tp_getsockopt,
1775 .sendmsg = pppol2tp_sendmsg,
1776 .recvmsg = pppol2tp_recvmsg,
1777 .mmap = sock_no_mmap,
1778 .ioctl = pppox_ioctl,
1781 static const struct pppox_proto pppol2tp_proto = {
1782 .create = pppol2tp_create,
1783 .ioctl = pppol2tp_ioctl,
1784 .owner = THIS_MODULE,
1787 #ifdef CONFIG_L2TP_V3
1789 static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = {
1790 .session_create = pppol2tp_session_create,
1791 .session_delete = pppol2tp_session_delete,
1794 #endif /* CONFIG_L2TP_V3 */
1796 static int __init pppol2tp_init(void)
1800 err = register_pernet_device(&pppol2tp_net_ops);
1804 err = proto_register(&pppol2tp_sk_proto, 0);
1806 goto out_unregister_pppol2tp_pernet;
1808 err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
1810 goto out_unregister_pppol2tp_proto;
1812 #ifdef CONFIG_L2TP_V3
1813 err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops);
1815 goto out_unregister_pppox;
1818 printk(KERN_INFO "PPPoL2TP kernel driver, %s\n",
1819 PPPOL2TP_DRV_VERSION);
1824 #ifdef CONFIG_L2TP_V3
1825 out_unregister_pppox:
1826 unregister_pppox_proto(PX_PROTO_OL2TP);
1828 out_unregister_pppol2tp_proto:
1829 proto_unregister(&pppol2tp_sk_proto);
1830 out_unregister_pppol2tp_pernet:
1831 unregister_pernet_device(&pppol2tp_net_ops);
1835 static void __exit pppol2tp_exit(void)
1837 #ifdef CONFIG_L2TP_V3
1838 l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP);
1840 unregister_pppox_proto(PX_PROTO_OL2TP);
1841 proto_unregister(&pppol2tp_sk_proto);
1842 unregister_pernet_device(&pppol2tp_net_ops);
1845 module_init(pppol2tp_init);
1846 module_exit(pppol2tp_exit);
1848 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1849 MODULE_DESCRIPTION("PPP over L2TP over UDP");
1850 MODULE_LICENSE("GPL");
1851 MODULE_VERSION(PPPOL2TP_DRV_VERSION);