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)
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;
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];
435 l2tp_xmit_skb(session, skb, session->hdr_len);
446 /* Free the original skb */
451 /*****************************************************************************
452 * Session (and tunnel control) socket create/destroy.
453 *****************************************************************************/
455 /* Called by l2tp_core when a session socket is being closed.
457 static void pppol2tp_session_close(struct l2tp_session *session)
459 struct pppol2tp_session *ps = l2tp_session_priv(session);
460 struct sock *sk = ps->sock;
463 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
465 if (session->session_id == 0)
471 if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) {
472 pppox_unbind_sock(sk);
473 sk->sk_state = PPPOX_DEAD;
474 sk->sk_state_change(sk);
477 /* Purge any queued data */
478 skb_queue_purge(&sk->sk_receive_queue);
479 skb_queue_purge(&sk->sk_write_queue);
480 while ((skb = skb_dequeue(&session->reorder_q))) {
492 /* Really kill the session socket. (Called from sock_put() if
495 static void pppol2tp_session_destruct(struct sock *sk)
497 struct l2tp_session *session;
499 if (sk->sk_user_data != NULL) {
500 session = sk->sk_user_data;
504 sk->sk_user_data = NULL;
505 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
506 l2tp_session_dec_refcount(session);
513 /* Called when the PPPoX socket (session) is closed.
515 static int pppol2tp_release(struct socket *sock)
517 struct sock *sk = sock->sk;
518 struct l2tp_session *session;
526 if (sock_flag(sk, SOCK_DEAD) != 0)
529 pppox_unbind_sock(sk);
531 /* Signal the death of the socket. */
532 sk->sk_state = PPPOX_DEAD;
536 session = pppol2tp_sock_to_session(sk);
538 /* Purge any queued data */
539 skb_queue_purge(&sk->sk_receive_queue);
540 skb_queue_purge(&sk->sk_write_queue);
541 if (session != NULL) {
543 while ((skb = skb_dequeue(&session->reorder_q))) {
552 /* This will delete the session context via
553 * pppol2tp_session_destruct() if the socket's refcnt drops to
565 static struct proto pppol2tp_sk_proto = {
567 .owner = THIS_MODULE,
568 .obj_size = sizeof(struct pppox_sock),
571 static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb)
575 rc = l2tp_udp_encap_recv(sk, skb);
579 return NET_RX_SUCCESS;
582 /* socket() handler. Initialize a new struct sock.
584 static int pppol2tp_create(struct net *net, struct socket *sock)
589 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto);
593 sock_init_data(sock, sk);
595 sock->state = SS_UNCONNECTED;
596 sock->ops = &pppol2tp_ops;
598 sk->sk_backlog_rcv = pppol2tp_backlog_recv;
599 sk->sk_protocol = PX_PROTO_OL2TP;
600 sk->sk_family = PF_PPPOX;
601 sk->sk_state = PPPOX_NONE;
602 sk->sk_type = SOCK_STREAM;
603 sk->sk_destruct = pppol2tp_session_destruct;
611 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
612 static void pppol2tp_show(struct seq_file *m, void *arg)
614 struct l2tp_session *session = arg;
615 struct pppol2tp_session *ps = l2tp_session_priv(session);
618 struct pppox_sock *po = pppox_sk(ps->sock);
620 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
625 /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
627 static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
628 int sockaddr_len, int flags)
630 struct sock *sk = sock->sk;
631 struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr;
632 struct sockaddr_pppol2tpv3 *sp3 = (struct sockaddr_pppol2tpv3 *) uservaddr;
633 struct pppox_sock *po = pppox_sk(sk);
634 struct l2tp_session *session = NULL;
635 struct l2tp_tunnel *tunnel;
636 struct pppol2tp_session *ps;
637 struct dst_entry *dst;
638 struct l2tp_session_cfg cfg = { 0, };
640 u32 tunnel_id, peer_tunnel_id;
641 u32 session_id, peer_session_id;
648 if (sp->sa_protocol != PX_PROTO_OL2TP)
651 /* Check for already bound sockets */
653 if (sk->sk_state & PPPOX_CONNECTED)
656 /* We don't supporting rebinding anyway */
658 if (sk->sk_user_data)
659 goto end; /* socket is already attached */
661 /* Get params from socket address. Handle L2TPv2 and L2TPv3 */
662 if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) {
663 fd = sp->pppol2tp.fd;
664 tunnel_id = sp->pppol2tp.s_tunnel;
665 peer_tunnel_id = sp->pppol2tp.d_tunnel;
666 session_id = sp->pppol2tp.s_session;
667 peer_session_id = sp->pppol2tp.d_session;
668 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) {
670 fd = sp3->pppol2tp.fd;
671 tunnel_id = sp3->pppol2tp.s_tunnel;
672 peer_tunnel_id = sp3->pppol2tp.d_tunnel;
673 session_id = sp3->pppol2tp.s_session;
674 peer_session_id = sp3->pppol2tp.d_session;
677 goto end; /* bad socket address */
680 /* Don't bind if tunnel_id is 0 */
685 tunnel = l2tp_tunnel_find(sock_net(sk), tunnel_id);
687 /* Special case: create tunnel context if session_id and
688 * peer_session_id is 0. Otherwise look up tunnel using supplied
691 if ((session_id == 0) && (peer_session_id == 0)) {
692 if (tunnel == NULL) {
693 struct l2tp_tunnel_cfg tcfg = {
694 .encap = L2TP_ENCAPTYPE_UDP,
697 error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel);
702 /* Error if we can't find the tunnel */
707 /* Error if socket is not prepped */
708 if (tunnel->sock == NULL)
712 if (tunnel->recv_payload_hook == NULL)
713 tunnel->recv_payload_hook = pppol2tp_recv_payload_hook;
715 if (tunnel->peer_tunnel_id == 0) {
717 tunnel->peer_tunnel_id = sp->pppol2tp.d_tunnel;
719 tunnel->peer_tunnel_id = sp3->pppol2tp.d_tunnel;
722 /* Create session if it doesn't already exist. We handle the
723 * case where a session was previously created by the netlink
724 * interface by checking that the session doesn't already have
725 * a socket and its tunnel socket are what we expect. If any
726 * of those checks fail, return EEXIST to the caller.
728 session = l2tp_session_find(sock_net(sk), tunnel, session_id);
729 if (session == NULL) {
730 /* Default MTU must allow space for UDP/L2TP/PPP
733 cfg.mtu = cfg.mru = 1500 - PPPOL2TP_HEADER_OVERHEAD;
735 /* Allocate and initialize a new session context. */
736 session = l2tp_session_create(sizeof(struct pppol2tp_session),
738 peer_session_id, &cfg);
739 if (session == NULL) {
744 ps = l2tp_session_priv(session);
746 if (ps->sock != NULL)
749 /* consistency checks */
750 if (ps->tunnel_sock != tunnel->sock)
754 /* Associate session with its PPPoL2TP socket */
755 ps = l2tp_session_priv(session);
756 ps->owner = current->pid;
758 ps->tunnel_sock = tunnel->sock;
760 session->recv_skb = pppol2tp_recv;
761 session->session_close = pppol2tp_session_close;
762 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
763 session->show = pppol2tp_show;
766 /* We need to know each time a skb is dropped from the reorder
769 session->ref = pppol2tp_session_sock_hold;
770 session->deref = pppol2tp_session_sock_put;
772 /* If PMTU discovery was enabled, use the MTU that was discovered */
773 dst = sk_dst_get(sk);
775 u32 pmtu = dst_mtu(__sk_dst_get(sk));
777 session->mtu = session->mru = pmtu -
778 PPPOL2TP_HEADER_OVERHEAD;
782 /* Special case: if source & dest session_id == 0x0000, this
783 * socket is being created to manage the tunnel. Just set up
784 * the internal context for use by ioctl() and sockopt()
787 if ((session->session_id == 0) &&
788 (session->peer_session_id == 0)) {
793 /* The only header we need to worry about is the L2TP
794 * header. This size is different depending on whether
795 * sequence numbers are enabled for the data channel.
797 po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
799 po->chan.private = sk;
800 po->chan.ops = &pppol2tp_chan_ops;
801 po->chan.mtu = session->mtu;
803 error = ppp_register_net_channel(sock_net(sk), &po->chan);
808 /* This is how we get the session context from the socket. */
809 sk->sk_user_data = session;
810 sk->sk_state = PPPOX_CONNECTED;
811 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
812 "%s: created\n", session->name);
820 #ifdef CONFIG_L2TP_V3
822 /* Called when creating sessions via the netlink interface.
824 static int pppol2tp_session_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg)
827 struct l2tp_tunnel *tunnel;
828 struct l2tp_session *session;
829 struct pppol2tp_session *ps;
831 tunnel = l2tp_tunnel_find(net, tunnel_id);
833 /* Error if we can't find the tunnel */
838 /* Error if tunnel socket is not prepped */
839 if (tunnel->sock == NULL)
842 /* Check that this session doesn't already exist */
844 session = l2tp_session_find(net, tunnel, session_id);
848 /* Default MTU values. */
850 cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
854 /* Allocate and initialize a new session context. */
856 session = l2tp_session_create(sizeof(struct pppol2tp_session),
858 peer_session_id, cfg);
862 ps = l2tp_session_priv(session);
863 ps->tunnel_sock = tunnel->sock;
865 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
866 "%s: created\n", session->name);
874 /* Called when deleting sessions via the netlink interface.
876 static int pppol2tp_session_delete(struct l2tp_session *session)
878 struct pppol2tp_session *ps = l2tp_session_priv(session);
880 if (ps->sock == NULL)
881 l2tp_session_dec_refcount(session);
886 #endif /* CONFIG_L2TP_V3 */
888 /* getname() support.
890 static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
891 int *usockaddr_len, int peer)
895 struct l2tp_session *session;
896 struct l2tp_tunnel *tunnel;
897 struct sock *sk = sock->sk;
898 struct inet_sock *inet;
899 struct pppol2tp_session *pls;
904 if (sk->sk_state != PPPOX_CONNECTED)
908 session = pppol2tp_sock_to_session(sk);
912 pls = l2tp_session_priv(session);
913 tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock);
914 if (tunnel == NULL) {
919 inet = inet_sk(tunnel->sock);
920 if (tunnel->version == 2) {
921 struct sockaddr_pppol2tp sp;
924 sp.sa_family = AF_PPPOX;
925 sp.sa_protocol = PX_PROTO_OL2TP;
926 sp.pppol2tp.fd = tunnel->fd;
927 sp.pppol2tp.pid = pls->owner;
928 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
929 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
930 sp.pppol2tp.s_session = session->session_id;
931 sp.pppol2tp.d_session = session->peer_session_id;
932 sp.pppol2tp.addr.sin_family = AF_INET;
933 sp.pppol2tp.addr.sin_port = inet->inet_dport;
934 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
935 memcpy(uaddr, &sp, len);
936 } else if (tunnel->version == 3) {
937 struct sockaddr_pppol2tpv3 sp;
940 sp.sa_family = AF_PPPOX;
941 sp.sa_protocol = PX_PROTO_OL2TP;
942 sp.pppol2tp.fd = tunnel->fd;
943 sp.pppol2tp.pid = pls->owner;
944 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
945 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
946 sp.pppol2tp.s_session = session->session_id;
947 sp.pppol2tp.d_session = session->peer_session_id;
948 sp.pppol2tp.addr.sin_family = AF_INET;
949 sp.pppol2tp.addr.sin_port = inet->inet_dport;
950 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
951 memcpy(uaddr, &sp, len);
954 *usockaddr_len = len;
956 sock_put(pls->tunnel_sock);
965 /****************************************************************************
968 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
969 * sockets. However, in order to control kernel tunnel features, we allow
970 * userspace to create a special "tunnel" PPPoX socket which is used for
971 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
972 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
974 ****************************************************************************/
976 static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest,
977 struct l2tp_stats *stats)
979 dest->tx_packets = stats->tx_packets;
980 dest->tx_bytes = stats->tx_bytes;
981 dest->tx_errors = stats->tx_errors;
982 dest->rx_packets = stats->rx_packets;
983 dest->rx_bytes = stats->rx_bytes;
984 dest->rx_seq_discards = stats->rx_seq_discards;
985 dest->rx_oos_packets = stats->rx_oos_packets;
986 dest->rx_errors = stats->rx_errors;
989 /* Session ioctl helper.
991 static int pppol2tp_session_ioctl(struct l2tp_session *session,
992 unsigned int cmd, unsigned long arg)
998 struct pppol2tp_session *ps = l2tp_session_priv(session);
999 struct l2tp_tunnel *tunnel = session->tunnel;
1000 struct pppol2tp_ioc_stats stats;
1002 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG,
1003 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
1004 session->name, cmd, arg);
1012 if (!(sk->sk_state & PPPOX_CONNECTED))
1016 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1018 ifr.ifr_mtu = session->mtu;
1019 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
1022 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1023 "%s: get mtu=%d\n", session->name, session->mtu);
1029 if (!(sk->sk_state & PPPOX_CONNECTED))
1033 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1036 session->mtu = ifr.ifr_mtu;
1038 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1039 "%s: set mtu=%d\n", session->name, session->mtu);
1045 if (!(sk->sk_state & PPPOX_CONNECTED))
1049 if (put_user(session->mru, (int __user *) arg))
1052 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1053 "%s: get mru=%d\n", session->name, session->mru);
1059 if (!(sk->sk_state & PPPOX_CONNECTED))
1063 if (get_user(val, (int __user *) arg))
1067 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1068 "%s: set mru=%d\n", session->name, session->mru);
1074 if (put_user(ps->flags, (int __user *) arg))
1077 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1078 "%s: get flags=%d\n", session->name, ps->flags);
1084 if (get_user(val, (int __user *) arg))
1087 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1088 "%s: set flags=%d\n", session->name, ps->flags);
1092 case PPPIOCGL2TPSTATS:
1094 if (!(sk->sk_state & PPPOX_CONNECTED))
1097 memset(&stats, 0, sizeof(stats));
1098 stats.tunnel_id = tunnel->tunnel_id;
1099 stats.session_id = session->session_id;
1100 pppol2tp_copy_stats(&stats, &session->stats);
1101 if (copy_to_user((void __user *) arg, &stats,
1104 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1105 "%s: get L2TP stats\n", session->name);
1119 /* Tunnel ioctl helper.
1121 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1122 * specifies a session_id, the session ioctl handler is called. This allows an
1123 * application to retrieve session stats via a tunnel socket.
1125 static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
1126 unsigned int cmd, unsigned long arg)
1130 struct pppol2tp_ioc_stats stats;
1132 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG,
1133 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1134 tunnel->name, cmd, arg);
1140 case PPPIOCGL2TPSTATS:
1142 if (!(sk->sk_state & PPPOX_CONNECTED))
1145 if (copy_from_user(&stats, (void __user *) arg,
1150 if (stats.session_id != 0) {
1151 /* resend to session ioctl handler */
1152 struct l2tp_session *session =
1153 l2tp_session_find(sock_net(sk), tunnel, stats.session_id);
1154 if (session != NULL)
1155 err = pppol2tp_session_ioctl(session, cmd, arg);
1161 stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
1163 pppol2tp_copy_stats(&stats, &tunnel->stats);
1164 if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) {
1168 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1169 "%s: get L2TP stats\n", tunnel->name);
1183 /* Main ioctl() handler.
1184 * Dispatch to tunnel or session helpers depending on the socket.
1186 static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
1189 struct sock *sk = sock->sk;
1190 struct l2tp_session *session;
1191 struct l2tp_tunnel *tunnel;
1192 struct pppol2tp_session *ps;
1199 if (sock_flag(sk, SOCK_DEAD) != 0)
1203 if ((sk->sk_user_data == NULL) ||
1204 (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
1207 /* Get session context from the socket */
1209 session = pppol2tp_sock_to_session(sk);
1210 if (session == NULL)
1213 /* Special case: if session's session_id is zero, treat ioctl as a
1216 ps = l2tp_session_priv(session);
1217 if ((session->session_id == 0) &&
1218 (session->peer_session_id == 0)) {
1220 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1224 err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
1225 sock_put(ps->tunnel_sock);
1229 err = pppol2tp_session_ioctl(session, cmd, arg);
1237 /*****************************************************************************
1238 * setsockopt() / getsockopt() support.
1240 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1241 * sockets. In order to control kernel tunnel features, we allow userspace to
1242 * create a special "tunnel" PPPoX socket which is used for control only.
1243 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1244 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1245 *****************************************************************************/
1247 /* Tunnel setsockopt() helper.
1249 static int pppol2tp_tunnel_setsockopt(struct sock *sk,
1250 struct l2tp_tunnel *tunnel,
1251 int optname, int val)
1256 case PPPOL2TP_SO_DEBUG:
1257 tunnel->debug = val;
1258 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1259 "%s: set debug=%x\n", tunnel->name, tunnel->debug);
1270 /* Session setsockopt helper.
1272 static int pppol2tp_session_setsockopt(struct sock *sk,
1273 struct l2tp_session *session,
1274 int optname, int val)
1277 struct pppol2tp_session *ps = l2tp_session_priv(session);
1280 case PPPOL2TP_SO_RECVSEQ:
1281 if ((val != 0) && (val != 1)) {
1285 session->recv_seq = val ? -1 : 0;
1286 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1287 "%s: set recv_seq=%d\n", session->name, session->recv_seq);
1290 case PPPOL2TP_SO_SENDSEQ:
1291 if ((val != 0) && (val != 1)) {
1295 session->send_seq = val ? -1 : 0;
1297 struct sock *ssk = ps->sock;
1298 struct pppox_sock *po = pppox_sk(ssk);
1299 po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
1300 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1302 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1303 "%s: set send_seq=%d\n", session->name, session->send_seq);
1306 case PPPOL2TP_SO_LNSMODE:
1307 if ((val != 0) && (val != 1)) {
1311 session->lns_mode = val ? -1 : 0;
1312 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1313 "%s: set lns_mode=%d\n", session->name, session->lns_mode);
1316 case PPPOL2TP_SO_DEBUG:
1317 session->debug = val;
1318 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1319 "%s: set debug=%x\n", session->name, session->debug);
1322 case PPPOL2TP_SO_REORDERTO:
1323 session->reorder_timeout = msecs_to_jiffies(val);
1324 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1325 "%s: set reorder_timeout=%d\n", session->name, session->reorder_timeout);
1336 /* Main setsockopt() entry point.
1337 * Does API checks, then calls either the tunnel or session setsockopt
1338 * handler, according to whether the PPPoL2TP socket is a for a regular
1339 * session or the special tunnel type.
1341 static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
1342 char __user *optval, unsigned int optlen)
1344 struct sock *sk = sock->sk;
1345 struct l2tp_session *session;
1346 struct l2tp_tunnel *tunnel;
1347 struct pppol2tp_session *ps;
1351 if (level != SOL_PPPOL2TP)
1352 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
1354 if (optlen < sizeof(int))
1357 if (get_user(val, (int __user *)optval))
1361 if (sk->sk_user_data == NULL)
1364 /* Get session context from the socket */
1366 session = pppol2tp_sock_to_session(sk);
1367 if (session == NULL)
1370 /* Special case: if session_id == 0x0000, treat as operation on tunnel
1372 ps = l2tp_session_priv(session);
1373 if ((session->session_id == 0) &&
1374 (session->peer_session_id == 0)) {
1376 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1380 err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
1381 sock_put(ps->tunnel_sock);
1383 err = pppol2tp_session_setsockopt(sk, session, optname, val);
1393 /* Tunnel getsockopt helper. Called with sock locked.
1395 static int pppol2tp_tunnel_getsockopt(struct sock *sk,
1396 struct l2tp_tunnel *tunnel,
1397 int optname, int *val)
1402 case PPPOL2TP_SO_DEBUG:
1403 *val = tunnel->debug;
1404 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1405 "%s: get debug=%x\n", tunnel->name, tunnel->debug);
1416 /* Session getsockopt helper. Called with sock locked.
1418 static int pppol2tp_session_getsockopt(struct sock *sk,
1419 struct l2tp_session *session,
1420 int optname, int *val)
1425 case PPPOL2TP_SO_RECVSEQ:
1426 *val = session->recv_seq;
1427 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1428 "%s: get recv_seq=%d\n", session->name, *val);
1431 case PPPOL2TP_SO_SENDSEQ:
1432 *val = session->send_seq;
1433 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1434 "%s: get send_seq=%d\n", session->name, *val);
1437 case PPPOL2TP_SO_LNSMODE:
1438 *val = session->lns_mode;
1439 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1440 "%s: get lns_mode=%d\n", session->name, *val);
1443 case PPPOL2TP_SO_DEBUG:
1444 *val = session->debug;
1445 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1446 "%s: get debug=%d\n", session->name, *val);
1449 case PPPOL2TP_SO_REORDERTO:
1450 *val = (int) jiffies_to_msecs(session->reorder_timeout);
1451 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1452 "%s: get reorder_timeout=%d\n", session->name, *val);
1462 /* Main getsockopt() entry point.
1463 * Does API checks, then calls either the tunnel or session getsockopt
1464 * handler, according to whether the PPPoX socket is a for a regular session
1465 * or the special tunnel type.
1467 static int pppol2tp_getsockopt(struct socket *sock, int level,
1468 int optname, char __user *optval, int __user *optlen)
1470 struct sock *sk = sock->sk;
1471 struct l2tp_session *session;
1472 struct l2tp_tunnel *tunnel;
1475 struct pppol2tp_session *ps;
1477 if (level != SOL_PPPOL2TP)
1478 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1480 if (get_user(len, (int __user *) optlen))
1483 len = min_t(unsigned int, len, sizeof(int));
1489 if (sk->sk_user_data == NULL)
1492 /* Get the session context */
1494 session = pppol2tp_sock_to_session(sk);
1495 if (session == NULL)
1498 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1499 ps = l2tp_session_priv(session);
1500 if ((session->session_id == 0) &&
1501 (session->peer_session_id == 0)) {
1503 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1507 err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
1508 sock_put(ps->tunnel_sock);
1510 err = pppol2tp_session_getsockopt(sk, session, optname, &val);
1513 if (put_user(len, (int __user *) optlen))
1516 if (copy_to_user((void __user *) optval, &val, len))
1527 /*****************************************************************************
1528 * /proc filesystem for debug
1529 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1530 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1531 *****************************************************************************/
1533 static unsigned int pppol2tp_net_id;
1535 #ifdef CONFIG_PROC_FS
1537 struct pppol2tp_seq_data {
1538 struct seq_net_private p;
1539 int tunnel_idx; /* current tunnel */
1540 int session_idx; /* index of session within current tunnel */
1541 struct l2tp_tunnel *tunnel;
1542 struct l2tp_session *session; /* NULL means get next tunnel */
1545 static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
1548 pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx);
1551 if (pd->tunnel == NULL)
1554 /* Ignore L2TPv3 tunnels */
1555 if (pd->tunnel->version < 3)
1560 static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
1562 pd->session = l2tp_session_find_nth(pd->tunnel, pd->session_idx);
1565 if (pd->session == NULL) {
1566 pd->session_idx = 0;
1567 pppol2tp_next_tunnel(net, pd);
1571 static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
1573 struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
1580 BUG_ON(m->private == NULL);
1582 net = seq_file_net(m);
1584 if (pd->tunnel == NULL)
1585 pppol2tp_next_tunnel(net, pd);
1587 pppol2tp_next_session(net, pd);
1589 /* NULL tunnel and session indicates end of list */
1590 if ((pd->tunnel == NULL) && (pd->session == NULL))
1597 static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
1603 static void pppol2tp_seq_stop(struct seq_file *p, void *v)
1608 static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
1610 struct l2tp_tunnel *tunnel = v;
1612 seq_printf(m, "\nTUNNEL '%s', %c %d\n",
1614 (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
1615 atomic_read(&tunnel->ref_count) - 1);
1616 seq_printf(m, " %08x %llu/%llu/%llu %llu/%llu/%llu\n",
1618 (unsigned long long)tunnel->stats.tx_packets,
1619 (unsigned long long)tunnel->stats.tx_bytes,
1620 (unsigned long long)tunnel->stats.tx_errors,
1621 (unsigned long long)tunnel->stats.rx_packets,
1622 (unsigned long long)tunnel->stats.rx_bytes,
1623 (unsigned long long)tunnel->stats.rx_errors);
1626 static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
1628 struct l2tp_session *session = v;
1629 struct l2tp_tunnel *tunnel = session->tunnel;
1630 struct pppol2tp_session *ps = l2tp_session_priv(session);
1631 struct pppox_sock *po = pppox_sk(ps->sock);
1636 struct inet_sock *inet = inet_sk(tunnel->sock);
1637 ip = ntohl(inet->inet_saddr);
1638 port = ntohs(inet->inet_sport);
1641 seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
1642 "%04X/%04X %d %c\n",
1643 session->name, ip, port,
1645 session->session_id,
1646 tunnel->peer_tunnel_id,
1647 session->peer_session_id,
1649 (session == ps->sock->sk_user_data) ?
1651 seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n",
1652 session->mtu, session->mru,
1653 session->recv_seq ? 'R' : '-',
1654 session->send_seq ? 'S' : '-',
1655 session->lns_mode ? "LNS" : "LAC",
1657 jiffies_to_msecs(session->reorder_timeout));
1658 seq_printf(m, " %hu/%hu %llu/%llu/%llu %llu/%llu/%llu\n",
1659 session->nr, session->ns,
1660 (unsigned long long)session->stats.tx_packets,
1661 (unsigned long long)session->stats.tx_bytes,
1662 (unsigned long long)session->stats.tx_errors,
1663 (unsigned long long)session->stats.rx_packets,
1664 (unsigned long long)session->stats.rx_bytes,
1665 (unsigned long long)session->stats.rx_errors);
1668 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
1671 static int pppol2tp_seq_show(struct seq_file *m, void *v)
1673 struct pppol2tp_seq_data *pd = v;
1675 /* display header on line 1 */
1676 if (v == SEQ_START_TOKEN) {
1677 seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
1678 seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
1679 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1680 seq_puts(m, " SESSION name, addr/port src-tid/sid "
1681 "dest-tid/sid state user-data-ok\n");
1682 seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1683 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1687 /* Show the tunnel or session context.
1689 if (pd->session == NULL)
1690 pppol2tp_seq_tunnel_show(m, pd->tunnel);
1692 pppol2tp_seq_session_show(m, pd->session);
1698 static const struct seq_operations pppol2tp_seq_ops = {
1699 .start = pppol2tp_seq_start,
1700 .next = pppol2tp_seq_next,
1701 .stop = pppol2tp_seq_stop,
1702 .show = pppol2tp_seq_show,
1705 /* Called when our /proc file is opened. We allocate data for use when
1706 * iterating our tunnel / session contexts and store it in the private
1707 * data of the seq_file.
1709 static int pppol2tp_proc_open(struct inode *inode, struct file *file)
1711 return seq_open_net(inode, file, &pppol2tp_seq_ops,
1712 sizeof(struct pppol2tp_seq_data));
1715 static const struct file_operations pppol2tp_proc_fops = {
1716 .owner = THIS_MODULE,
1717 .open = pppol2tp_proc_open,
1719 .llseek = seq_lseek,
1720 .release = seq_release_net,
1723 #endif /* CONFIG_PROC_FS */
1725 /*****************************************************************************
1727 *****************************************************************************/
1729 static __net_init int pppol2tp_init_net(struct net *net)
1731 struct proc_dir_entry *pde;
1734 pde = proc_net_fops_create(net, "pppol2tp", S_IRUGO, &pppol2tp_proc_fops);
1744 static __net_exit void pppol2tp_exit_net(struct net *net)
1746 proc_net_remove(net, "pppol2tp");
1749 static struct pernet_operations pppol2tp_net_ops = {
1750 .init = pppol2tp_init_net,
1751 .exit = pppol2tp_exit_net,
1752 .id = &pppol2tp_net_id,
1755 /*****************************************************************************
1757 *****************************************************************************/
1759 static const struct proto_ops pppol2tp_ops = {
1761 .owner = THIS_MODULE,
1762 .release = pppol2tp_release,
1763 .bind = sock_no_bind,
1764 .connect = pppol2tp_connect,
1765 .socketpair = sock_no_socketpair,
1766 .accept = sock_no_accept,
1767 .getname = pppol2tp_getname,
1768 .poll = datagram_poll,
1769 .listen = sock_no_listen,
1770 .shutdown = sock_no_shutdown,
1771 .setsockopt = pppol2tp_setsockopt,
1772 .getsockopt = pppol2tp_getsockopt,
1773 .sendmsg = pppol2tp_sendmsg,
1774 .recvmsg = pppol2tp_recvmsg,
1775 .mmap = sock_no_mmap,
1776 .ioctl = pppox_ioctl,
1779 static const struct pppox_proto pppol2tp_proto = {
1780 .create = pppol2tp_create,
1781 .ioctl = pppol2tp_ioctl
1784 #ifdef CONFIG_L2TP_V3
1786 static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = {
1787 .session_create = pppol2tp_session_create,
1788 .session_delete = pppol2tp_session_delete,
1791 #endif /* CONFIG_L2TP_V3 */
1793 static int __init pppol2tp_init(void)
1797 err = register_pernet_device(&pppol2tp_net_ops);
1801 err = proto_register(&pppol2tp_sk_proto, 0);
1803 goto out_unregister_pppol2tp_pernet;
1805 err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
1807 goto out_unregister_pppol2tp_proto;
1809 #ifdef CONFIG_L2TP_V3
1810 err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops);
1812 goto out_unregister_pppox;
1815 printk(KERN_INFO "PPPoL2TP kernel driver, %s\n",
1816 PPPOL2TP_DRV_VERSION);
1821 #ifdef CONFIG_L2TP_V3
1822 out_unregister_pppox:
1823 unregister_pppox_proto(PX_PROTO_OL2TP);
1825 out_unregister_pppol2tp_proto:
1826 proto_unregister(&pppol2tp_sk_proto);
1827 out_unregister_pppol2tp_pernet:
1828 unregister_pernet_device(&pppol2tp_net_ops);
1832 static void __exit pppol2tp_exit(void)
1834 #ifdef CONFIG_L2TP_V3
1835 l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP);
1837 unregister_pppox_proto(PX_PROTO_OL2TP);
1838 proto_unregister(&pppol2tp_sk_proto);
1839 unregister_pernet_device(&pppol2tp_net_ops);
1842 module_init(pppol2tp_init);
1843 module_exit(pppol2tp_exit);
1845 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1846 MODULE_DESCRIPTION("PPP over L2TP over UDP");
1847 MODULE_LICENSE("GPL");
1848 MODULE_VERSION(PPPOL2TP_DRV_VERSION);