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/ppp-ioctl.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)
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->data, m->msg_iov, total_len);
356 goto error_put_sess_tun;
358 skb_put(skb, total_len);
360 l2tp_xmit_skb(session, skb, session->hdr_len);
362 sock_put(ps->tunnel_sock);
367 sock_put(ps->tunnel_sock);
374 /* Transmit function called by generic PPP driver. Sends PPP frame
375 * over PPPoL2TP socket.
377 * This is almost the same as pppol2tp_sendmsg(), but rather than
378 * being called with a msghdr from userspace, it is called with a skb
381 * The supplied skb from ppp doesn't have enough headroom for the
382 * insertion of L2TP, UDP and IP headers so we need to allocate more
383 * headroom in the skb. This will create a cloned skb. But we must be
384 * careful in the error case because the caller will expect to free
385 * the skb it supplied, not our cloned skb. So we take care to always
386 * leave the original skb unfreed if we return an error.
388 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
390 static const u8 ppph[2] = { 0xff, 0x03 };
391 struct sock *sk = (struct sock *) chan->private;
393 struct l2tp_session *session;
394 struct l2tp_tunnel *tunnel;
395 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 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
418 headroom = NET_SKB_PAD +
419 sizeof(struct iphdr) + /* IP header */
420 uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */
421 session->hdr_len + /* L2TP header */
422 sizeof(ppph); /* PPP header */
423 if (skb_cow_head(skb, headroom))
424 goto abort_put_sess_tun;
426 new_headroom = skb_headroom(skb);
427 skb->truesize += new_headroom - old_headroom;
429 /* Setup PPP header */
430 __skb_push(skb, sizeof(ppph));
431 skb->data[0] = ppph[0];
432 skb->data[1] = ppph[1];
434 l2tp_xmit_skb(session, skb, session->hdr_len);
445 /* Free the original skb */
450 /*****************************************************************************
451 * Session (and tunnel control) socket create/destroy.
452 *****************************************************************************/
454 /* Called by l2tp_core when a session socket is being closed.
456 static void pppol2tp_session_close(struct l2tp_session *session)
458 struct pppol2tp_session *ps = l2tp_session_priv(session);
459 struct sock *sk = ps->sock;
462 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
464 if (session->session_id == 0)
470 if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) {
471 pppox_unbind_sock(sk);
472 sk->sk_state = PPPOX_DEAD;
473 sk->sk_state_change(sk);
476 /* Purge any queued data */
477 skb_queue_purge(&sk->sk_receive_queue);
478 skb_queue_purge(&sk->sk_write_queue);
479 while ((skb = skb_dequeue(&session->reorder_q))) {
491 /* Really kill the session socket. (Called from sock_put() if
494 static void pppol2tp_session_destruct(struct sock *sk)
496 struct l2tp_session *session;
498 if (sk->sk_user_data != NULL) {
499 session = sk->sk_user_data;
503 sk->sk_user_data = NULL;
504 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
505 l2tp_session_dec_refcount(session);
512 /* Called when the PPPoX socket (session) is closed.
514 static int pppol2tp_release(struct socket *sock)
516 struct sock *sk = sock->sk;
517 struct l2tp_session *session;
525 if (sock_flag(sk, SOCK_DEAD) != 0)
528 pppox_unbind_sock(sk);
530 /* Signal the death of the socket. */
531 sk->sk_state = PPPOX_DEAD;
535 session = pppol2tp_sock_to_session(sk);
537 /* Purge any queued data */
538 skb_queue_purge(&sk->sk_receive_queue);
539 skb_queue_purge(&sk->sk_write_queue);
540 if (session != NULL) {
542 while ((skb = skb_dequeue(&session->reorder_q))) {
551 /* This will delete the session context via
552 * pppol2tp_session_destruct() if the socket's refcnt drops to
564 static struct proto pppol2tp_sk_proto = {
566 .owner = THIS_MODULE,
567 .obj_size = sizeof(struct pppox_sock),
570 static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb)
574 rc = l2tp_udp_encap_recv(sk, skb);
578 return NET_RX_SUCCESS;
581 /* socket() handler. Initialize a new struct sock.
583 static int pppol2tp_create(struct net *net, struct socket *sock)
588 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto);
592 sock_init_data(sock, sk);
594 sock->state = SS_UNCONNECTED;
595 sock->ops = &pppol2tp_ops;
597 sk->sk_backlog_rcv = pppol2tp_backlog_recv;
598 sk->sk_protocol = PX_PROTO_OL2TP;
599 sk->sk_family = PF_PPPOX;
600 sk->sk_state = PPPOX_NONE;
601 sk->sk_type = SOCK_STREAM;
602 sk->sk_destruct = pppol2tp_session_destruct;
610 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
611 static void pppol2tp_show(struct seq_file *m, void *arg)
613 struct l2tp_session *session = arg;
614 struct pppol2tp_session *ps = l2tp_session_priv(session);
617 struct pppox_sock *po = pppox_sk(ps->sock);
619 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
624 /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
626 static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
627 int sockaddr_len, int flags)
629 struct sock *sk = sock->sk;
630 struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr;
631 struct sockaddr_pppol2tpv3 *sp3 = (struct sockaddr_pppol2tpv3 *) uservaddr;
632 struct pppox_sock *po = pppox_sk(sk);
633 struct l2tp_session *session = NULL;
634 struct l2tp_tunnel *tunnel;
635 struct pppol2tp_session *ps;
636 struct dst_entry *dst;
637 struct l2tp_session_cfg cfg = { 0, };
639 u32 tunnel_id, peer_tunnel_id;
640 u32 session_id, peer_session_id;
647 if (sp->sa_protocol != PX_PROTO_OL2TP)
650 /* Check for already bound sockets */
652 if (sk->sk_state & PPPOX_CONNECTED)
655 /* We don't supporting rebinding anyway */
657 if (sk->sk_user_data)
658 goto end; /* socket is already attached */
660 /* Get params from socket address. Handle L2TPv2 and L2TPv3 */
661 if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) {
662 fd = sp->pppol2tp.fd;
663 tunnel_id = sp->pppol2tp.s_tunnel;
664 peer_tunnel_id = sp->pppol2tp.d_tunnel;
665 session_id = sp->pppol2tp.s_session;
666 peer_session_id = sp->pppol2tp.d_session;
667 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) {
669 fd = sp3->pppol2tp.fd;
670 tunnel_id = sp3->pppol2tp.s_tunnel;
671 peer_tunnel_id = sp3->pppol2tp.d_tunnel;
672 session_id = sp3->pppol2tp.s_session;
673 peer_session_id = sp3->pppol2tp.d_session;
676 goto end; /* bad socket address */
679 /* Don't bind if tunnel_id is 0 */
684 tunnel = l2tp_tunnel_find(sock_net(sk), tunnel_id);
686 /* Special case: create tunnel context if session_id and
687 * peer_session_id is 0. Otherwise look up tunnel using supplied
690 if ((session_id == 0) && (peer_session_id == 0)) {
691 if (tunnel == NULL) {
692 struct l2tp_tunnel_cfg tcfg = {
693 .encap = L2TP_ENCAPTYPE_UDP,
696 error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel);
701 /* Error if we can't find the tunnel */
706 /* Error if socket is not prepped */
707 if (tunnel->sock == NULL)
711 if (tunnel->recv_payload_hook == NULL)
712 tunnel->recv_payload_hook = pppol2tp_recv_payload_hook;
714 if (tunnel->peer_tunnel_id == 0) {
716 tunnel->peer_tunnel_id = sp->pppol2tp.d_tunnel;
718 tunnel->peer_tunnel_id = sp3->pppol2tp.d_tunnel;
721 /* Create session if it doesn't already exist. We handle the
722 * case where a session was previously created by the netlink
723 * interface by checking that the session doesn't already have
724 * a socket and its tunnel socket are what we expect. If any
725 * of those checks fail, return EEXIST to the caller.
727 session = l2tp_session_find(sock_net(sk), tunnel, session_id);
728 if (session == NULL) {
729 /* Default MTU must allow space for UDP/L2TP/PPP
732 cfg.mtu = cfg.mru = 1500 - PPPOL2TP_HEADER_OVERHEAD;
734 /* Allocate and initialize a new session context. */
735 session = l2tp_session_create(sizeof(struct pppol2tp_session),
737 peer_session_id, &cfg);
738 if (session == NULL) {
743 ps = l2tp_session_priv(session);
745 if (ps->sock != NULL)
748 /* consistency checks */
749 if (ps->tunnel_sock != tunnel->sock)
753 /* Associate session with its PPPoL2TP socket */
754 ps = l2tp_session_priv(session);
755 ps->owner = current->pid;
757 ps->tunnel_sock = tunnel->sock;
759 session->recv_skb = pppol2tp_recv;
760 session->session_close = pppol2tp_session_close;
761 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
762 session->show = pppol2tp_show;
765 /* We need to know each time a skb is dropped from the reorder
768 session->ref = pppol2tp_session_sock_hold;
769 session->deref = pppol2tp_session_sock_put;
771 /* If PMTU discovery was enabled, use the MTU that was discovered */
772 dst = sk_dst_get(sk);
774 u32 pmtu = dst_mtu(__sk_dst_get(sk));
776 session->mtu = session->mru = pmtu -
777 PPPOL2TP_HEADER_OVERHEAD;
781 /* Special case: if source & dest session_id == 0x0000, this
782 * socket is being created to manage the tunnel. Just set up
783 * the internal context for use by ioctl() and sockopt()
786 if ((session->session_id == 0) &&
787 (session->peer_session_id == 0)) {
792 /* The only header we need to worry about is the L2TP
793 * header. This size is different depending on whether
794 * sequence numbers are enabled for the data channel.
796 po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
798 po->chan.private = sk;
799 po->chan.ops = &pppol2tp_chan_ops;
800 po->chan.mtu = session->mtu;
802 error = ppp_register_net_channel(sock_net(sk), &po->chan);
807 /* This is how we get the session context from the socket. */
808 sk->sk_user_data = session;
809 sk->sk_state = PPPOX_CONNECTED;
810 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
811 "%s: created\n", session->name);
819 #ifdef CONFIG_L2TP_V3
821 /* Called when creating sessions via the netlink interface.
823 static int pppol2tp_session_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg)
826 struct l2tp_tunnel *tunnel;
827 struct l2tp_session *session;
828 struct pppol2tp_session *ps;
830 tunnel = l2tp_tunnel_find(net, tunnel_id);
832 /* Error if we can't find the tunnel */
837 /* Error if tunnel socket is not prepped */
838 if (tunnel->sock == NULL)
841 /* Check that this session doesn't already exist */
843 session = l2tp_session_find(net, tunnel, session_id);
847 /* Default MTU values. */
849 cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
853 /* Allocate and initialize a new session context. */
855 session = l2tp_session_create(sizeof(struct pppol2tp_session),
857 peer_session_id, cfg);
861 ps = l2tp_session_priv(session);
862 ps->tunnel_sock = tunnel->sock;
864 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
865 "%s: created\n", session->name);
873 /* Called when deleting sessions via the netlink interface.
875 static int pppol2tp_session_delete(struct l2tp_session *session)
877 struct pppol2tp_session *ps = l2tp_session_priv(session);
879 if (ps->sock == NULL)
880 l2tp_session_dec_refcount(session);
885 #endif /* CONFIG_L2TP_V3 */
887 /* getname() support.
889 static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
890 int *usockaddr_len, int peer)
894 struct l2tp_session *session;
895 struct l2tp_tunnel *tunnel;
896 struct sock *sk = sock->sk;
897 struct inet_sock *inet;
898 struct pppol2tp_session *pls;
903 if (sk->sk_state != PPPOX_CONNECTED)
907 session = pppol2tp_sock_to_session(sk);
911 pls = l2tp_session_priv(session);
912 tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock);
913 if (tunnel == NULL) {
918 inet = inet_sk(tunnel->sock);
919 if (tunnel->version == 2) {
920 struct sockaddr_pppol2tp sp;
923 sp.sa_family = AF_PPPOX;
924 sp.sa_protocol = PX_PROTO_OL2TP;
925 sp.pppol2tp.fd = tunnel->fd;
926 sp.pppol2tp.pid = pls->owner;
927 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
928 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
929 sp.pppol2tp.s_session = session->session_id;
930 sp.pppol2tp.d_session = session->peer_session_id;
931 sp.pppol2tp.addr.sin_family = AF_INET;
932 sp.pppol2tp.addr.sin_port = inet->inet_dport;
933 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
934 memcpy(uaddr, &sp, len);
935 } else if (tunnel->version == 3) {
936 struct sockaddr_pppol2tpv3 sp;
939 sp.sa_family = AF_PPPOX;
940 sp.sa_protocol = PX_PROTO_OL2TP;
941 sp.pppol2tp.fd = tunnel->fd;
942 sp.pppol2tp.pid = pls->owner;
943 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
944 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
945 sp.pppol2tp.s_session = session->session_id;
946 sp.pppol2tp.d_session = session->peer_session_id;
947 sp.pppol2tp.addr.sin_family = AF_INET;
948 sp.pppol2tp.addr.sin_port = inet->inet_dport;
949 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
950 memcpy(uaddr, &sp, len);
953 *usockaddr_len = len;
955 sock_put(pls->tunnel_sock);
964 /****************************************************************************
967 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
968 * sockets. However, in order to control kernel tunnel features, we allow
969 * userspace to create a special "tunnel" PPPoX socket which is used for
970 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
971 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
973 ****************************************************************************/
975 static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest,
976 struct l2tp_stats *stats)
978 dest->tx_packets = stats->tx_packets;
979 dest->tx_bytes = stats->tx_bytes;
980 dest->tx_errors = stats->tx_errors;
981 dest->rx_packets = stats->rx_packets;
982 dest->rx_bytes = stats->rx_bytes;
983 dest->rx_seq_discards = stats->rx_seq_discards;
984 dest->rx_oos_packets = stats->rx_oos_packets;
985 dest->rx_errors = stats->rx_errors;
988 /* Session ioctl helper.
990 static int pppol2tp_session_ioctl(struct l2tp_session *session,
991 unsigned int cmd, unsigned long arg)
997 struct pppol2tp_session *ps = l2tp_session_priv(session);
998 struct l2tp_tunnel *tunnel = session->tunnel;
999 struct pppol2tp_ioc_stats stats;
1001 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG,
1002 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
1003 session->name, cmd, arg);
1011 if (!(sk->sk_state & PPPOX_CONNECTED))
1015 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1017 ifr.ifr_mtu = session->mtu;
1018 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
1021 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1022 "%s: get mtu=%d\n", session->name, session->mtu);
1028 if (!(sk->sk_state & PPPOX_CONNECTED))
1032 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1035 session->mtu = ifr.ifr_mtu;
1037 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1038 "%s: set mtu=%d\n", session->name, session->mtu);
1044 if (!(sk->sk_state & PPPOX_CONNECTED))
1048 if (put_user(session->mru, (int __user *) arg))
1051 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1052 "%s: get mru=%d\n", session->name, session->mru);
1058 if (!(sk->sk_state & PPPOX_CONNECTED))
1062 if (get_user(val, (int __user *) arg))
1066 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1067 "%s: set mru=%d\n", session->name, session->mru);
1073 if (put_user(ps->flags, (int __user *) arg))
1076 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1077 "%s: get flags=%d\n", session->name, ps->flags);
1083 if (get_user(val, (int __user *) arg))
1086 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1087 "%s: set flags=%d\n", session->name, ps->flags);
1091 case PPPIOCGL2TPSTATS:
1093 if (!(sk->sk_state & PPPOX_CONNECTED))
1096 memset(&stats, 0, sizeof(stats));
1097 stats.tunnel_id = tunnel->tunnel_id;
1098 stats.session_id = session->session_id;
1099 pppol2tp_copy_stats(&stats, &session->stats);
1100 if (copy_to_user((void __user *) arg, &stats,
1103 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1104 "%s: get L2TP stats\n", session->name);
1118 /* Tunnel ioctl helper.
1120 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1121 * specifies a session_id, the session ioctl handler is called. This allows an
1122 * application to retrieve session stats via a tunnel socket.
1124 static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
1125 unsigned int cmd, unsigned long arg)
1129 struct pppol2tp_ioc_stats stats;
1131 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG,
1132 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1133 tunnel->name, cmd, arg);
1139 case PPPIOCGL2TPSTATS:
1141 if (!(sk->sk_state & PPPOX_CONNECTED))
1144 if (copy_from_user(&stats, (void __user *) arg,
1149 if (stats.session_id != 0) {
1150 /* resend to session ioctl handler */
1151 struct l2tp_session *session =
1152 l2tp_session_find(sock_net(sk), tunnel, stats.session_id);
1153 if (session != NULL)
1154 err = pppol2tp_session_ioctl(session, cmd, arg);
1160 stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
1162 pppol2tp_copy_stats(&stats, &tunnel->stats);
1163 if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) {
1167 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1168 "%s: get L2TP stats\n", tunnel->name);
1182 /* Main ioctl() handler.
1183 * Dispatch to tunnel or session helpers depending on the socket.
1185 static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
1188 struct sock *sk = sock->sk;
1189 struct l2tp_session *session;
1190 struct l2tp_tunnel *tunnel;
1191 struct pppol2tp_session *ps;
1198 if (sock_flag(sk, SOCK_DEAD) != 0)
1202 if ((sk->sk_user_data == NULL) ||
1203 (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
1206 /* Get session context from the socket */
1208 session = pppol2tp_sock_to_session(sk);
1209 if (session == NULL)
1212 /* Special case: if session's session_id is zero, treat ioctl as a
1215 ps = l2tp_session_priv(session);
1216 if ((session->session_id == 0) &&
1217 (session->peer_session_id == 0)) {
1219 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1223 err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
1224 sock_put(ps->tunnel_sock);
1228 err = pppol2tp_session_ioctl(session, cmd, arg);
1236 /*****************************************************************************
1237 * setsockopt() / getsockopt() support.
1239 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1240 * sockets. In order to control kernel tunnel features, we allow userspace to
1241 * create a special "tunnel" PPPoX socket which is used for control only.
1242 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1243 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1244 *****************************************************************************/
1246 /* Tunnel setsockopt() helper.
1248 static int pppol2tp_tunnel_setsockopt(struct sock *sk,
1249 struct l2tp_tunnel *tunnel,
1250 int optname, int val)
1255 case PPPOL2TP_SO_DEBUG:
1256 tunnel->debug = val;
1257 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1258 "%s: set debug=%x\n", tunnel->name, tunnel->debug);
1269 /* Session setsockopt helper.
1271 static int pppol2tp_session_setsockopt(struct sock *sk,
1272 struct l2tp_session *session,
1273 int optname, int val)
1276 struct pppol2tp_session *ps = l2tp_session_priv(session);
1279 case PPPOL2TP_SO_RECVSEQ:
1280 if ((val != 0) && (val != 1)) {
1284 session->recv_seq = val ? -1 : 0;
1285 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1286 "%s: set recv_seq=%d\n", session->name, session->recv_seq);
1289 case PPPOL2TP_SO_SENDSEQ:
1290 if ((val != 0) && (val != 1)) {
1294 session->send_seq = val ? -1 : 0;
1296 struct sock *ssk = ps->sock;
1297 struct pppox_sock *po = pppox_sk(ssk);
1298 po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
1299 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1301 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1302 "%s: set send_seq=%d\n", session->name, session->send_seq);
1305 case PPPOL2TP_SO_LNSMODE:
1306 if ((val != 0) && (val != 1)) {
1310 session->lns_mode = val ? -1 : 0;
1311 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1312 "%s: set lns_mode=%d\n", session->name, session->lns_mode);
1315 case PPPOL2TP_SO_DEBUG:
1316 session->debug = val;
1317 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1318 "%s: set debug=%x\n", session->name, session->debug);
1321 case PPPOL2TP_SO_REORDERTO:
1322 session->reorder_timeout = msecs_to_jiffies(val);
1323 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1324 "%s: set reorder_timeout=%d\n", session->name, session->reorder_timeout);
1335 /* Main setsockopt() entry point.
1336 * Does API checks, then calls either the tunnel or session setsockopt
1337 * handler, according to whether the PPPoL2TP socket is a for a regular
1338 * session or the special tunnel type.
1340 static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
1341 char __user *optval, unsigned int optlen)
1343 struct sock *sk = sock->sk;
1344 struct l2tp_session *session;
1345 struct l2tp_tunnel *tunnel;
1346 struct pppol2tp_session *ps;
1350 if (level != SOL_PPPOL2TP)
1351 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
1353 if (optlen < sizeof(int))
1356 if (get_user(val, (int __user *)optval))
1360 if (sk->sk_user_data == NULL)
1363 /* Get session context from the socket */
1365 session = pppol2tp_sock_to_session(sk);
1366 if (session == NULL)
1369 /* Special case: if session_id == 0x0000, treat as operation on tunnel
1371 ps = l2tp_session_priv(session);
1372 if ((session->session_id == 0) &&
1373 (session->peer_session_id == 0)) {
1375 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1379 err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
1380 sock_put(ps->tunnel_sock);
1382 err = pppol2tp_session_setsockopt(sk, session, optname, val);
1392 /* Tunnel getsockopt helper. Called with sock locked.
1394 static int pppol2tp_tunnel_getsockopt(struct sock *sk,
1395 struct l2tp_tunnel *tunnel,
1396 int optname, int *val)
1401 case PPPOL2TP_SO_DEBUG:
1402 *val = tunnel->debug;
1403 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1404 "%s: get debug=%x\n", tunnel->name, tunnel->debug);
1415 /* Session getsockopt helper. Called with sock locked.
1417 static int pppol2tp_session_getsockopt(struct sock *sk,
1418 struct l2tp_session *session,
1419 int optname, int *val)
1424 case PPPOL2TP_SO_RECVSEQ:
1425 *val = session->recv_seq;
1426 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1427 "%s: get recv_seq=%d\n", session->name, *val);
1430 case PPPOL2TP_SO_SENDSEQ:
1431 *val = session->send_seq;
1432 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1433 "%s: get send_seq=%d\n", session->name, *val);
1436 case PPPOL2TP_SO_LNSMODE:
1437 *val = session->lns_mode;
1438 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1439 "%s: get lns_mode=%d\n", session->name, *val);
1442 case PPPOL2TP_SO_DEBUG:
1443 *val = session->debug;
1444 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1445 "%s: get debug=%d\n", session->name, *val);
1448 case PPPOL2TP_SO_REORDERTO:
1449 *val = (int) jiffies_to_msecs(session->reorder_timeout);
1450 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1451 "%s: get reorder_timeout=%d\n", session->name, *val);
1461 /* Main getsockopt() entry point.
1462 * Does API checks, then calls either the tunnel or session getsockopt
1463 * handler, according to whether the PPPoX socket is a for a regular session
1464 * or the special tunnel type.
1466 static int pppol2tp_getsockopt(struct socket *sock, int level,
1467 int optname, char __user *optval, int __user *optlen)
1469 struct sock *sk = sock->sk;
1470 struct l2tp_session *session;
1471 struct l2tp_tunnel *tunnel;
1474 struct pppol2tp_session *ps;
1476 if (level != SOL_PPPOL2TP)
1477 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1479 if (get_user(len, (int __user *) optlen))
1482 len = min_t(unsigned int, len, sizeof(int));
1488 if (sk->sk_user_data == NULL)
1491 /* Get the session context */
1493 session = pppol2tp_sock_to_session(sk);
1494 if (session == NULL)
1497 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1498 ps = l2tp_session_priv(session);
1499 if ((session->session_id == 0) &&
1500 (session->peer_session_id == 0)) {
1502 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1506 err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
1507 sock_put(ps->tunnel_sock);
1509 err = pppol2tp_session_getsockopt(sk, session, optname, &val);
1512 if (put_user(len, (int __user *) optlen))
1515 if (copy_to_user((void __user *) optval, &val, len))
1526 /*****************************************************************************
1527 * /proc filesystem for debug
1528 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1529 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1530 *****************************************************************************/
1532 static unsigned int pppol2tp_net_id;
1534 #ifdef CONFIG_PROC_FS
1536 struct pppol2tp_seq_data {
1537 struct seq_net_private p;
1538 int tunnel_idx; /* current tunnel */
1539 int session_idx; /* index of session within current tunnel */
1540 struct l2tp_tunnel *tunnel;
1541 struct l2tp_session *session; /* NULL means get next tunnel */
1544 static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
1547 pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx);
1550 if (pd->tunnel == NULL)
1553 /* Ignore L2TPv3 tunnels */
1554 if (pd->tunnel->version < 3)
1559 static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
1561 pd->session = l2tp_session_find_nth(pd->tunnel, pd->session_idx);
1564 if (pd->session == NULL) {
1565 pd->session_idx = 0;
1566 pppol2tp_next_tunnel(net, pd);
1570 static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
1572 struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
1579 BUG_ON(m->private == NULL);
1581 net = seq_file_net(m);
1583 if (pd->tunnel == NULL)
1584 pppol2tp_next_tunnel(net, pd);
1586 pppol2tp_next_session(net, pd);
1588 /* NULL tunnel and session indicates end of list */
1589 if ((pd->tunnel == NULL) && (pd->session == NULL))
1596 static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
1602 static void pppol2tp_seq_stop(struct seq_file *p, void *v)
1607 static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
1609 struct l2tp_tunnel *tunnel = v;
1611 seq_printf(m, "\nTUNNEL '%s', %c %d\n",
1613 (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
1614 atomic_read(&tunnel->ref_count) - 1);
1615 seq_printf(m, " %08x %llu/%llu/%llu %llu/%llu/%llu\n",
1617 (unsigned long long)tunnel->stats.tx_packets,
1618 (unsigned long long)tunnel->stats.tx_bytes,
1619 (unsigned long long)tunnel->stats.tx_errors,
1620 (unsigned long long)tunnel->stats.rx_packets,
1621 (unsigned long long)tunnel->stats.rx_bytes,
1622 (unsigned long long)tunnel->stats.rx_errors);
1625 static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
1627 struct l2tp_session *session = v;
1628 struct l2tp_tunnel *tunnel = session->tunnel;
1629 struct pppol2tp_session *ps = l2tp_session_priv(session);
1630 struct pppox_sock *po = pppox_sk(ps->sock);
1635 struct inet_sock *inet = inet_sk(tunnel->sock);
1636 ip = ntohl(inet->inet_saddr);
1637 port = ntohs(inet->inet_sport);
1640 seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
1641 "%04X/%04X %d %c\n",
1642 session->name, ip, port,
1644 session->session_id,
1645 tunnel->peer_tunnel_id,
1646 session->peer_session_id,
1648 (session == ps->sock->sk_user_data) ?
1650 seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n",
1651 session->mtu, session->mru,
1652 session->recv_seq ? 'R' : '-',
1653 session->send_seq ? 'S' : '-',
1654 session->lns_mode ? "LNS" : "LAC",
1656 jiffies_to_msecs(session->reorder_timeout));
1657 seq_printf(m, " %hu/%hu %llu/%llu/%llu %llu/%llu/%llu\n",
1658 session->nr, session->ns,
1659 (unsigned long long)session->stats.tx_packets,
1660 (unsigned long long)session->stats.tx_bytes,
1661 (unsigned long long)session->stats.tx_errors,
1662 (unsigned long long)session->stats.rx_packets,
1663 (unsigned long long)session->stats.rx_bytes,
1664 (unsigned long long)session->stats.rx_errors);
1667 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
1670 static int pppol2tp_seq_show(struct seq_file *m, void *v)
1672 struct pppol2tp_seq_data *pd = v;
1674 /* display header on line 1 */
1675 if (v == SEQ_START_TOKEN) {
1676 seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
1677 seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
1678 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1679 seq_puts(m, " SESSION name, addr/port src-tid/sid "
1680 "dest-tid/sid state user-data-ok\n");
1681 seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1682 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1686 /* Show the tunnel or session context.
1688 if (pd->session == NULL)
1689 pppol2tp_seq_tunnel_show(m, pd->tunnel);
1691 pppol2tp_seq_session_show(m, pd->session);
1697 static const struct seq_operations pppol2tp_seq_ops = {
1698 .start = pppol2tp_seq_start,
1699 .next = pppol2tp_seq_next,
1700 .stop = pppol2tp_seq_stop,
1701 .show = pppol2tp_seq_show,
1704 /* Called when our /proc file is opened. We allocate data for use when
1705 * iterating our tunnel / session contexts and store it in the private
1706 * data of the seq_file.
1708 static int pppol2tp_proc_open(struct inode *inode, struct file *file)
1710 return seq_open_net(inode, file, &pppol2tp_seq_ops,
1711 sizeof(struct pppol2tp_seq_data));
1714 static const struct file_operations pppol2tp_proc_fops = {
1715 .owner = THIS_MODULE,
1716 .open = pppol2tp_proc_open,
1718 .llseek = seq_lseek,
1719 .release = seq_release_net,
1722 #endif /* CONFIG_PROC_FS */
1724 /*****************************************************************************
1726 *****************************************************************************/
1728 static __net_init int pppol2tp_init_net(struct net *net)
1730 struct proc_dir_entry *pde;
1733 pde = proc_net_fops_create(net, "pppol2tp", S_IRUGO, &pppol2tp_proc_fops);
1743 static __net_exit void pppol2tp_exit_net(struct net *net)
1745 proc_net_remove(net, "pppol2tp");
1748 static struct pernet_operations pppol2tp_net_ops = {
1749 .init = pppol2tp_init_net,
1750 .exit = pppol2tp_exit_net,
1751 .id = &pppol2tp_net_id,
1754 /*****************************************************************************
1756 *****************************************************************************/
1758 static const struct proto_ops pppol2tp_ops = {
1760 .owner = THIS_MODULE,
1761 .release = pppol2tp_release,
1762 .bind = sock_no_bind,
1763 .connect = pppol2tp_connect,
1764 .socketpair = sock_no_socketpair,
1765 .accept = sock_no_accept,
1766 .getname = pppol2tp_getname,
1767 .poll = datagram_poll,
1768 .listen = sock_no_listen,
1769 .shutdown = sock_no_shutdown,
1770 .setsockopt = pppol2tp_setsockopt,
1771 .getsockopt = pppol2tp_getsockopt,
1772 .sendmsg = pppol2tp_sendmsg,
1773 .recvmsg = pppol2tp_recvmsg,
1774 .mmap = sock_no_mmap,
1775 .ioctl = pppox_ioctl,
1778 static const struct pppox_proto pppol2tp_proto = {
1779 .create = pppol2tp_create,
1780 .ioctl = pppol2tp_ioctl
1783 #ifdef CONFIG_L2TP_V3
1785 static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = {
1786 .session_create = pppol2tp_session_create,
1787 .session_delete = pppol2tp_session_delete,
1790 #endif /* CONFIG_L2TP_V3 */
1792 static int __init pppol2tp_init(void)
1796 err = register_pernet_device(&pppol2tp_net_ops);
1800 err = proto_register(&pppol2tp_sk_proto, 0);
1802 goto out_unregister_pppol2tp_pernet;
1804 err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
1806 goto out_unregister_pppol2tp_proto;
1808 #ifdef CONFIG_L2TP_V3
1809 err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops);
1811 goto out_unregister_pppox;
1814 printk(KERN_INFO "PPPoL2TP kernel driver, %s\n",
1815 PPPOL2TP_DRV_VERSION);
1820 #ifdef CONFIG_L2TP_V3
1821 out_unregister_pppox:
1822 unregister_pppox_proto(PX_PROTO_OL2TP);
1824 out_unregister_pppol2tp_proto:
1825 proto_unregister(&pppol2tp_sk_proto);
1826 out_unregister_pppol2tp_pernet:
1827 unregister_pernet_device(&pppol2tp_net_ops);
1831 static void __exit pppol2tp_exit(void)
1833 #ifdef CONFIG_L2TP_V3
1834 l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP);
1836 unregister_pppox_proto(PX_PROTO_OL2TP);
1837 proto_unregister(&pppol2tp_sk_proto);
1838 unregister_pernet_device(&pppol2tp_net_ops);
1841 module_init(pppol2tp_init);
1842 module_exit(pppol2tp_exit);
1844 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1845 MODULE_DESCRIPTION("PPP over L2TP over UDP");
1846 MODULE_LICENSE("GPL");
1847 MODULE_VERSION(PPPOL2TP_DRV_VERSION);
1848 MODULE_ALIAS("pppox-proto-" __stringify(PX_PROTO_OL2TP));