1 /*****************************************************************************
2 * Linux PPP over L2TP (PPPoX/PPPoL2TP) Sockets
4 * PPPoX --- Generic PPP encapsulation socket family
5 * PPPoL2TP --- PPP over L2TP (RFC 2661)
9 * Authors: James Chapman (jchapman@katalix.com)
11 * Based on original work by Martijn van Oosterhout <kleptog@svana.org>
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
21 /* This driver handles only L2TP data frames; control frames are handled by a
22 * userspace application.
24 * To send data in an L2TP session, userspace opens a PPPoL2TP socket and
25 * attaches it to a bound UDP socket with local tunnel_id / session_id and
26 * peer tunnel_id / session_id set. Data can then be sent or received using
27 * regular socket sendmsg() / recvmsg() calls. Kernel parameters of the socket
28 * can be read or modified using ioctl() or [gs]etsockopt() calls.
30 * When a PPPoL2TP socket is connected with local and peer session_id values
31 * zero, the socket is treated as a special tunnel management socket.
33 * Here's example userspace code to create a socket for sending/receiving data
34 * over an L2TP session:-
36 * struct sockaddr_pppol2tp sax;
40 * fd = socket(AF_PPPOX, SOCK_DGRAM, PX_PROTO_OL2TP);
42 * sax.sa_family = AF_PPPOX;
43 * sax.sa_protocol = PX_PROTO_OL2TP;
44 * sax.pppol2tp.fd = tunnel_fd; // bound UDP socket
45 * sax.pppol2tp.addr.sin_addr.s_addr = addr->sin_addr.s_addr;
46 * sax.pppol2tp.addr.sin_port = addr->sin_port;
47 * sax.pppol2tp.addr.sin_family = AF_INET;
48 * sax.pppol2tp.s_tunnel = tunnel_id;
49 * sax.pppol2tp.s_session = session_id;
50 * sax.pppol2tp.d_tunnel = peer_tunnel_id;
51 * sax.pppol2tp.d_session = peer_session_id;
53 * session_fd = connect(fd, (struct sockaddr *)&sax, sizeof(sax));
55 * A pppd plugin that allows PPP traffic to be carried over L2TP using
56 * this driver is available from the OpenL2TP project at
57 * http://openl2tp.sourceforge.net.
60 #include <linux/module.h>
61 #include <linux/string.h>
62 #include <linux/list.h>
63 #include <linux/uaccess.h>
65 #include <linux/kernel.h>
66 #include <linux/spinlock.h>
67 #include <linux/kthread.h>
68 #include <linux/sched.h>
69 #include <linux/slab.h>
70 #include <linux/errno.h>
71 #include <linux/jiffies.h>
73 #include <linux/netdevice.h>
74 #include <linux/net.h>
75 #include <linux/inetdevice.h>
76 #include <linux/skbuff.h>
77 #include <linux/init.h>
79 #include <linux/udp.h>
80 #include <linux/if_pppox.h>
81 #include <linux/if_pppol2tp.h>
83 #include <linux/ppp_channel.h>
84 #include <linux/ppp_defs.h>
85 #include <linux/if_ppp.h>
86 #include <linux/file.h>
87 #include <linux/hash.h>
88 #include <linux/sort.h>
89 #include <linux/proc_fs.h>
90 #include <linux/l2tp.h>
91 #include <linux/nsproxy.h>
92 #include <net/net_namespace.h>
93 #include <net/netns/generic.h>
98 #include <net/inet_common.h>
100 #include <asm/byteorder.h>
101 #include <linux/atomic.h>
103 #include "l2tp_core.h"
105 #define PPPOL2TP_DRV_VERSION "V2.0"
107 /* Space for UDP, L2TP and PPP headers */
108 #define PPPOL2TP_HEADER_OVERHEAD 40
110 #define PRINTK(_mask, _type, _lvl, _fmt, args...) \
112 if ((_mask) & (_type)) \
113 printk(_lvl "PPPOL2TP: " _fmt, ##args); \
116 /* Number of bytes to build transmit L2TP headers.
117 * Unfortunately the size is different depending on whether sequence numbers
120 #define PPPOL2TP_L2TP_HDR_SIZE_SEQ 10
121 #define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ 6
123 /* Private data of each session. This data lives at the end of struct
124 * l2tp_session, referenced via session->priv[].
126 struct pppol2tp_session {
127 int owner; /* pid that opened the socket */
129 struct mutex sk_lock; /* Protects .sk */
130 struct sock __rcu *sk; /* Pointer to the session
132 struct sock *__sk; /* Copy of .sk, for cleanup */
133 struct rcu_head rcu; /* For asynchronous release */
134 struct sock *tunnel_sock; /* Pointer to the tunnel UDP
136 int flags; /* accessed by PPPIOCGFLAGS.
140 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb);
142 static const struct ppp_channel_ops pppol2tp_chan_ops = {
143 .start_xmit = pppol2tp_xmit,
146 static const struct proto_ops pppol2tp_ops;
148 /* Retrieves the pppol2tp socket associated to a session.
149 * A reference is held on the returned socket, so this function must be paired
152 static struct sock *pppol2tp_session_get_sock(struct l2tp_session *session)
154 struct pppol2tp_session *ps = l2tp_session_priv(session);
158 sk = rcu_dereference(ps->sk);
166 /* Helpers to obtain tunnel/session contexts from sockets.
168 static inline struct l2tp_session *pppol2tp_sock_to_session(struct sock *sk)
170 struct l2tp_session *session;
176 session = (struct l2tp_session *)(sk->sk_user_data);
177 if (session == NULL) {
182 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
188 /*****************************************************************************
189 * Receive data handling
190 *****************************************************************************/
192 static int pppol2tp_recv_payload_hook(struct sk_buff *skb)
194 /* Skip PPP header, if present. In testing, Microsoft L2TP clients
195 * don't send the PPP header (PPP header compression enabled), but
196 * other clients can include the header. So we cope with both cases
197 * here. The PPP header is always FF03 when using L2TP.
199 * Note that skb->data[] isn't dereferenced from a u16 ptr here since
200 * the field may be unaligned.
202 if (!pskb_may_pull(skb, 2))
205 if ((skb->data[0] == 0xff) && (skb->data[1] == 0x03))
211 /* Receive message. This is the recvmsg for the PPPoL2TP socket.
213 static int pppol2tp_recvmsg(struct kiocb *iocb, struct socket *sock,
214 struct msghdr *msg, size_t len,
219 struct sock *sk = sock->sk;
222 if (sk->sk_state & PPPOX_BOUND)
226 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
227 flags & MSG_DONTWAIT, &err);
233 else if (len < skb->len)
234 msg->msg_flags |= MSG_TRUNC;
236 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len);
237 if (likely(err == 0))
245 static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
247 struct pppol2tp_session *ps = l2tp_session_priv(session);
248 struct sock *sk = NULL;
250 /* If the socket is bound, send it in to PPP's input queue. Otherwise
251 * queue it on the session socket.
254 sk = rcu_dereference(ps->sk);
258 if (sk->sk_state & PPPOX_BOUND) {
259 struct pppox_sock *po;
260 PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG,
261 "%s: recv %d byte data frame, passing to ppp\n",
262 session->name, data_len);
264 /* We need to forget all info related to the L2TP packet
265 * gathered in the skb as we are going to reuse the same
266 * skb for the inner packet.
268 * - reset xfrm (IPSec) information as it applies to
269 * the outer L2TP packet and not to the inner one
270 * - release the dst to force a route lookup on the inner
271 * IP packet since skb->dst currently points to the dst
273 * - reset netfilter information as it doesn't apply
274 * to the inner packet either
281 ppp_input(&po->chan, skb);
283 PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_INFO,
284 "%s: socket not bound\n", session->name);
286 /* Not bound. Nothing we can do, so discard. */
287 session->stats.rx_errors++;
296 PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_INFO,
297 "%s: no socket\n", session->name);
301 /************************************************************************
303 ***********************************************************************/
305 /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here
306 * when a user application does a sendmsg() on the session socket. L2TP and
307 * PPP headers must be inserted into the user's data.
309 static int pppol2tp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
312 static const unsigned char ppph[2] = { 0xff, 0x03 };
313 struct sock *sk = sock->sk;
316 struct l2tp_session *session;
317 struct l2tp_tunnel *tunnel;
318 struct pppol2tp_session *ps;
322 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
325 /* Get session and tunnel contexts */
327 session = pppol2tp_sock_to_session(sk);
331 ps = l2tp_session_priv(session);
332 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
336 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
338 /* Allocate a socket buffer */
340 skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) +
341 uhlen + session->hdr_len +
342 sizeof(ppph) + total_len,
345 goto error_put_sess_tun;
347 /* Reserve space for headers. */
348 skb_reserve(skb, NET_SKB_PAD);
349 skb_reset_network_header(skb);
350 skb_reserve(skb, sizeof(struct iphdr));
351 skb_reset_transport_header(skb);
352 skb_reserve(skb, uhlen);
355 skb->data[0] = ppph[0];
356 skb->data[1] = ppph[1];
359 /* Copy user data into skb */
360 error = memcpy_fromiovec(skb_put(skb, total_len), m->msg_iov,
364 goto error_put_sess_tun;
368 l2tp_xmit_skb(session, skb, session->hdr_len);
371 sock_put(ps->tunnel_sock);
377 sock_put(ps->tunnel_sock);
384 /* Transmit function called by generic PPP driver. Sends PPP frame
385 * over PPPoL2TP socket.
387 * This is almost the same as pppol2tp_sendmsg(), but rather than
388 * being called with a msghdr from userspace, it is called with a skb
391 * The supplied skb from ppp doesn't have enough headroom for the
392 * insertion of L2TP, UDP and IP headers so we need to allocate more
393 * headroom in the skb. This will create a cloned skb. But we must be
394 * careful in the error case because the caller will expect to free
395 * the skb it supplied, not our cloned skb. So we take care to always
396 * leave the original skb unfreed if we return an error.
398 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
400 static const u8 ppph[2] = { 0xff, 0x03 };
401 struct sock *sk = (struct sock *) chan->private;
403 struct l2tp_session *session;
404 struct l2tp_tunnel *tunnel;
405 struct pppol2tp_session *ps;
410 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
413 /* Get session and tunnel contexts from the socket */
414 session = pppol2tp_sock_to_session(sk);
418 ps = l2tp_session_priv(session);
419 sk_tun = ps->tunnel_sock;
422 tunnel = l2tp_sock_to_tunnel(sk_tun);
426 old_headroom = skb_headroom(skb);
427 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
428 headroom = NET_SKB_PAD +
429 sizeof(struct iphdr) + /* IP header */
430 uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */
431 session->hdr_len + /* L2TP header */
432 sizeof(ppph); /* PPP header */
433 if (skb_cow_head(skb, headroom))
434 goto abort_put_sess_tun;
436 new_headroom = skb_headroom(skb);
437 skb->truesize += new_headroom - old_headroom;
439 /* Setup PPP header */
440 __skb_push(skb, sizeof(ppph));
441 skb->data[0] = ppph[0];
442 skb->data[1] = ppph[1];
445 l2tp_xmit_skb(session, skb, session->hdr_len);
457 /* Free the original skb */
462 /*****************************************************************************
463 * Session (and tunnel control) socket create/destroy.
464 *****************************************************************************/
466 /* Called by l2tp_core when a session socket is being closed.
468 static void pppol2tp_session_close(struct l2tp_session *session)
472 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
475 sk = pppol2tp_session_get_sock(session);
478 inet_shutdown(sk->sk_socket, SEND_SHUTDOWN);
482 /* Don't let the session go away before our socket does */
483 l2tp_session_inc_refcount(session);
487 /* Really kill the session socket. (Called from sock_put() if
490 static void pppol2tp_session_destruct(struct sock *sk)
492 struct l2tp_session *session;
494 if (sk->sk_user_data != NULL) {
495 session = sk->sk_user_data;
499 sk->sk_user_data = NULL;
500 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
501 l2tp_session_dec_refcount(session);
508 static void pppol2tp_put_sk(struct rcu_head *head)
510 struct pppol2tp_session *ps;
512 ps = container_of(head, typeof(*ps), rcu);
516 /* Called when the PPPoX socket (session) is closed.
518 static int pppol2tp_release(struct socket *sock)
520 struct sock *sk = sock->sk;
521 struct l2tp_session *session;
529 if (sock_flag(sk, SOCK_DEAD) != 0)
532 pppox_unbind_sock(sk);
534 /* Signal the death of the socket. */
535 sk->sk_state = PPPOX_DEAD;
539 session = pppol2tp_sock_to_session(sk);
541 if (session != NULL) {
542 struct pppol2tp_session *ps;
544 l2tp_session_queue_purge(session);
546 ps = l2tp_session_priv(session);
547 mutex_lock(&ps->sk_lock);
548 ps->__sk = rcu_dereference_protected(ps->sk,
549 lockdep_is_held(&ps->sk_lock));
550 RCU_INIT_POINTER(ps->sk, NULL);
551 mutex_unlock(&ps->sk_lock);
552 call_rcu(&ps->rcu, pppol2tp_put_sk);
554 /* Rely on the sock_put() call at the end of the function for
555 * dropping the reference held by pppol2tp_sock_to_session().
556 * The last reference will be dropped by pppol2tp_put_sk().
559 skb_queue_purge(&sk->sk_receive_queue);
560 skb_queue_purge(&sk->sk_write_queue);
564 /* This will delete the session context via
565 * pppol2tp_session_destruct() if the socket's refcnt drops to
577 static struct proto pppol2tp_sk_proto = {
579 .owner = THIS_MODULE,
580 .obj_size = sizeof(struct pppox_sock),
583 static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb)
587 rc = l2tp_udp_encap_recv(sk, skb);
591 return NET_RX_SUCCESS;
594 /* socket() handler. Initialize a new struct sock.
596 static int pppol2tp_create(struct net *net, struct socket *sock)
601 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto);
605 sock_init_data(sock, sk);
607 sock->state = SS_UNCONNECTED;
608 sock->ops = &pppol2tp_ops;
610 sk->sk_backlog_rcv = pppol2tp_backlog_recv;
611 sk->sk_protocol = PX_PROTO_OL2TP;
612 sk->sk_family = PF_PPPOX;
613 sk->sk_state = PPPOX_NONE;
614 sk->sk_type = SOCK_STREAM;
615 sk->sk_destruct = pppol2tp_session_destruct;
623 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
624 static void pppol2tp_show(struct seq_file *m, void *arg)
626 struct l2tp_session *session = arg;
629 sk = pppol2tp_session_get_sock(session);
631 struct pppox_sock *po = pppox_sk(sk);
633 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
639 /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
641 static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
642 int sockaddr_len, int flags)
644 struct sock *sk = sock->sk;
645 struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr;
646 struct sockaddr_pppol2tpv3 *sp3 = (struct sockaddr_pppol2tpv3 *) uservaddr;
647 struct pppox_sock *po = pppox_sk(sk);
648 struct l2tp_session *session = NULL;
649 struct l2tp_tunnel *tunnel;
650 struct pppol2tp_session *ps;
651 struct dst_entry *dst;
652 struct l2tp_session_cfg cfg = { 0, };
654 u32 tunnel_id, peer_tunnel_id;
655 u32 session_id, peer_session_id;
656 bool drop_refcnt = false;
657 bool drop_tunnel = false;
664 if (sp->sa_protocol != PX_PROTO_OL2TP)
667 /* Check for already bound sockets */
669 if (sk->sk_state & PPPOX_CONNECTED)
672 /* We don't supporting rebinding anyway */
674 if (sk->sk_user_data)
675 goto end; /* socket is already attached */
677 /* Get params from socket address. Handle L2TPv2 and L2TPv3 */
678 if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) {
679 fd = sp->pppol2tp.fd;
680 tunnel_id = sp->pppol2tp.s_tunnel;
681 peer_tunnel_id = sp->pppol2tp.d_tunnel;
682 session_id = sp->pppol2tp.s_session;
683 peer_session_id = sp->pppol2tp.d_session;
684 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) {
686 fd = sp3->pppol2tp.fd;
687 tunnel_id = sp3->pppol2tp.s_tunnel;
688 peer_tunnel_id = sp3->pppol2tp.d_tunnel;
689 session_id = sp3->pppol2tp.s_session;
690 peer_session_id = sp3->pppol2tp.d_session;
693 goto end; /* bad socket address */
696 /* Don't bind if tunnel_id is 0 */
701 tunnel = l2tp_tunnel_get(sock_net(sk), tunnel_id);
705 /* Special case: create tunnel context if session_id and
706 * peer_session_id is 0. Otherwise look up tunnel using supplied
709 if ((session_id == 0) && (peer_session_id == 0)) {
710 if (tunnel == NULL) {
711 struct l2tp_tunnel_cfg tcfg = {
712 .encap = L2TP_ENCAPTYPE_UDP,
715 error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel);
720 /* Error if we can't find the tunnel */
725 /* Error if socket is not prepped */
726 if (tunnel->sock == NULL)
730 if (tunnel->recv_payload_hook == NULL)
731 tunnel->recv_payload_hook = pppol2tp_recv_payload_hook;
733 if (tunnel->peer_tunnel_id == 0) {
735 tunnel->peer_tunnel_id = sp->pppol2tp.d_tunnel;
737 tunnel->peer_tunnel_id = sp3->pppol2tp.d_tunnel;
740 session = l2tp_session_get(sock_net(sk), tunnel, session_id, false);
743 ps = l2tp_session_priv(session);
745 /* Using a pre-existing session is fine as long as it hasn't
746 * been connected yet.
748 mutex_lock(&ps->sk_lock);
749 if (rcu_dereference_protected(ps->sk,
750 lockdep_is_held(&ps->sk_lock))) {
751 mutex_unlock(&ps->sk_lock);
756 /* consistency checks */
757 if (ps->tunnel_sock != tunnel->sock) {
758 mutex_unlock(&ps->sk_lock);
763 /* Default MTU must allow space for UDP/L2TP/PPP headers */
764 cfg.mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
767 session = l2tp_session_create(sizeof(struct pppol2tp_session),
769 peer_session_id, &cfg);
770 if (IS_ERR(session)) {
771 error = PTR_ERR(session);
775 ps = l2tp_session_priv(session);
776 mutex_init(&ps->sk_lock);
777 l2tp_session_inc_refcount(session);
779 mutex_lock(&ps->sk_lock);
780 error = l2tp_session_register(session, tunnel);
782 mutex_unlock(&ps->sk_lock);
789 ps->owner = current->pid;
790 ps->tunnel_sock = tunnel->sock;
792 session->recv_skb = pppol2tp_recv;
793 session->session_close = pppol2tp_session_close;
794 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
795 session->show = pppol2tp_show;
798 /* If PMTU discovery was enabled, use the MTU that was discovered */
799 dst = sk_dst_get(tunnel->sock);
801 u32 pmtu = dst_mtu(dst);
804 session->mtu = session->mru = pmtu -
805 PPPOL2TP_HEADER_OVERHEAD;
809 /* Special case: if source & dest session_id == 0x0000, this
810 * socket is being created to manage the tunnel. Just set up
811 * the internal context for use by ioctl() and sockopt()
814 if ((session->session_id == 0) &&
815 (session->peer_session_id == 0)) {
820 /* The only header we need to worry about is the L2TP
821 * header. This size is different depending on whether
822 * sequence numbers are enabled for the data channel.
824 po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
826 po->chan.private = sk;
827 po->chan.ops = &pppol2tp_chan_ops;
828 po->chan.mtu = session->mtu;
830 error = ppp_register_net_channel(sock_net(sk), &po->chan);
832 mutex_unlock(&ps->sk_lock);
837 /* This is how we get the session context from the socket. */
838 sk->sk_user_data = session;
839 rcu_assign_pointer(ps->sk, sk);
840 mutex_unlock(&ps->sk_lock);
842 sk->sk_state = PPPOX_CONNECTED;
843 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
844 "%s: created\n", session->name);
848 l2tp_session_dec_refcount(session);
850 l2tp_tunnel_dec_refcount(tunnel);
856 #ifdef CONFIG_L2TP_V3
858 /* Called when creating sessions via the netlink interface. */
859 static int pppol2tp_session_create(struct net *net, struct l2tp_tunnel *tunnel,
860 u32 session_id, u32 peer_session_id,
861 struct l2tp_session_cfg *cfg)
864 struct l2tp_session *session;
865 struct pppol2tp_session *ps;
867 /* Error if tunnel socket is not prepped */
873 /* Default MTU values. */
875 cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
879 /* Allocate and initialize a new session context. */
880 session = l2tp_session_create(sizeof(struct pppol2tp_session),
882 peer_session_id, cfg);
883 if (IS_ERR(session)) {
884 error = PTR_ERR(session);
888 ps = l2tp_session_priv(session);
889 mutex_init(&ps->sk_lock);
890 ps->tunnel_sock = tunnel->sock;
892 error = l2tp_session_register(session, tunnel);
904 #endif /* CONFIG_L2TP_V3 */
906 /* getname() support.
908 static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
909 int *usockaddr_len, int peer)
913 struct l2tp_session *session;
914 struct l2tp_tunnel *tunnel;
915 struct sock *sk = sock->sk;
916 struct inet_sock *inet;
917 struct pppol2tp_session *pls;
922 if (sk->sk_state != PPPOX_CONNECTED)
926 session = pppol2tp_sock_to_session(sk);
930 pls = l2tp_session_priv(session);
931 tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock);
935 inet = inet_sk(tunnel->sock);
936 if (tunnel->version == 2) {
937 struct sockaddr_pppol2tp 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);
952 } else if (tunnel->version == 3) {
953 struct sockaddr_pppol2tpv3 sp;
956 sp.sa_family = AF_PPPOX;
957 sp.sa_protocol = PX_PROTO_OL2TP;
958 sp.pppol2tp.fd = tunnel->fd;
959 sp.pppol2tp.pid = pls->owner;
960 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
961 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
962 sp.pppol2tp.s_session = session->session_id;
963 sp.pppol2tp.d_session = session->peer_session_id;
964 sp.pppol2tp.addr.sin_family = AF_INET;
965 sp.pppol2tp.addr.sin_port = inet->inet_dport;
966 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
967 memcpy(uaddr, &sp, len);
970 *usockaddr_len = len;
973 sock_put(pls->tunnel_sock);
980 /****************************************************************************
983 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
984 * sockets. However, in order to control kernel tunnel features, we allow
985 * userspace to create a special "tunnel" PPPoX socket which is used for
986 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
987 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
989 ****************************************************************************/
991 static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest,
992 struct l2tp_stats *stats)
994 dest->tx_packets = stats->tx_packets;
995 dest->tx_bytes = stats->tx_bytes;
996 dest->tx_errors = stats->tx_errors;
997 dest->rx_packets = stats->rx_packets;
998 dest->rx_bytes = stats->rx_bytes;
999 dest->rx_seq_discards = stats->rx_seq_discards;
1000 dest->rx_oos_packets = stats->rx_oos_packets;
1001 dest->rx_errors = stats->rx_errors;
1004 /* Session ioctl helper.
1006 static int pppol2tp_session_ioctl(struct l2tp_session *session,
1007 unsigned int cmd, unsigned long arg)
1012 int val = (int) arg;
1013 struct pppol2tp_session *ps = l2tp_session_priv(session);
1014 struct l2tp_tunnel *tunnel = session->tunnel;
1015 struct pppol2tp_ioc_stats stats;
1017 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG,
1018 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
1019 session->name, cmd, arg);
1021 sk = pppol2tp_session_get_sock(session);
1028 if (!(sk->sk_state & PPPOX_CONNECTED))
1032 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1034 ifr.ifr_mtu = session->mtu;
1035 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
1038 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1039 "%s: get mtu=%d\n", session->name, session->mtu);
1045 if (!(sk->sk_state & PPPOX_CONNECTED))
1049 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1052 session->mtu = ifr.ifr_mtu;
1054 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1055 "%s: set mtu=%d\n", session->name, session->mtu);
1061 if (!(sk->sk_state & PPPOX_CONNECTED))
1065 if (put_user(session->mru, (int __user *) arg))
1068 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1069 "%s: get mru=%d\n", session->name, session->mru);
1075 if (!(sk->sk_state & PPPOX_CONNECTED))
1079 if (get_user(val, (int __user *) arg))
1083 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1084 "%s: set mru=%d\n", session->name, session->mru);
1090 if (put_user(ps->flags, (int __user *) arg))
1093 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1094 "%s: get flags=%d\n", session->name, ps->flags);
1100 if (get_user(val, (int __user *) arg))
1103 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1104 "%s: set flags=%d\n", session->name, ps->flags);
1108 case PPPIOCGL2TPSTATS:
1110 if (!(sk->sk_state & PPPOX_CONNECTED))
1113 memset(&stats, 0, sizeof(stats));
1114 stats.tunnel_id = tunnel->tunnel_id;
1115 stats.session_id = session->session_id;
1116 pppol2tp_copy_stats(&stats, &session->stats);
1117 if (copy_to_user((void __user *) arg, &stats,
1120 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1121 "%s: get L2TP stats\n", session->name);
1135 /* Tunnel ioctl helper.
1137 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1138 * specifies a session_id, the session ioctl handler is called. This allows an
1139 * application to retrieve session stats via a tunnel socket.
1141 static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
1142 unsigned int cmd, unsigned long arg)
1146 struct pppol2tp_ioc_stats stats;
1148 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG,
1149 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1150 tunnel->name, cmd, arg);
1156 case PPPIOCGL2TPSTATS:
1158 if (!(sk->sk_state & PPPOX_CONNECTED))
1161 if (copy_from_user(&stats, (void __user *) arg,
1166 if (stats.session_id != 0) {
1167 /* resend to session ioctl handler */
1168 struct l2tp_session *session =
1169 l2tp_session_get(sock_net(sk), tunnel,
1170 stats.session_id, true);
1173 err = pppol2tp_session_ioctl(session, cmd,
1176 session->deref(session);
1177 l2tp_session_dec_refcount(session);
1184 stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
1186 pppol2tp_copy_stats(&stats, &tunnel->stats);
1187 if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) {
1191 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1192 "%s: get L2TP stats\n", tunnel->name);
1206 /* Main ioctl() handler.
1207 * Dispatch to tunnel or session helpers depending on the socket.
1209 static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
1212 struct sock *sk = sock->sk;
1213 struct l2tp_session *session;
1214 struct l2tp_tunnel *tunnel;
1215 struct pppol2tp_session *ps;
1222 if (sock_flag(sk, SOCK_DEAD) != 0)
1226 if ((sk->sk_user_data == NULL) ||
1227 (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
1230 /* Get session context from the socket */
1232 session = pppol2tp_sock_to_session(sk);
1233 if (session == NULL)
1236 /* Special case: if session's session_id is zero, treat ioctl as a
1239 ps = l2tp_session_priv(session);
1240 if ((session->session_id == 0) &&
1241 (session->peer_session_id == 0)) {
1243 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1247 err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
1248 sock_put(ps->tunnel_sock);
1252 err = pppol2tp_session_ioctl(session, cmd, arg);
1260 /*****************************************************************************
1261 * setsockopt() / getsockopt() support.
1263 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1264 * sockets. In order to control kernel tunnel features, we allow userspace to
1265 * create a special "tunnel" PPPoX socket which is used for control only.
1266 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1267 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1268 *****************************************************************************/
1270 /* Tunnel setsockopt() helper.
1272 static int pppol2tp_tunnel_setsockopt(struct sock *sk,
1273 struct l2tp_tunnel *tunnel,
1274 int optname, int val)
1279 case PPPOL2TP_SO_DEBUG:
1280 tunnel->debug = val;
1281 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1282 "%s: set debug=%x\n", tunnel->name, tunnel->debug);
1293 /* Session setsockopt helper.
1295 static int pppol2tp_session_setsockopt(struct sock *sk,
1296 struct l2tp_session *session,
1297 int optname, int val)
1302 case PPPOL2TP_SO_RECVSEQ:
1303 if ((val != 0) && (val != 1)) {
1307 session->recv_seq = val ? -1 : 0;
1308 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1309 "%s: set recv_seq=%d\n", session->name, session->recv_seq);
1312 case PPPOL2TP_SO_SENDSEQ:
1313 if ((val != 0) && (val != 1)) {
1317 session->send_seq = val ? -1 : 0;
1319 struct pppox_sock *po = pppox_sk(sk);
1321 po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
1322 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1324 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1325 "%s: set send_seq=%d\n", session->name, session->send_seq);
1328 case PPPOL2TP_SO_LNSMODE:
1329 if ((val != 0) && (val != 1)) {
1333 session->lns_mode = val ? -1 : 0;
1334 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1335 "%s: set lns_mode=%d\n", session->name, session->lns_mode);
1338 case PPPOL2TP_SO_DEBUG:
1339 session->debug = val;
1340 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1341 "%s: set debug=%x\n", session->name, session->debug);
1344 case PPPOL2TP_SO_REORDERTO:
1345 session->reorder_timeout = msecs_to_jiffies(val);
1346 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1347 "%s: set reorder_timeout=%d\n", session->name, session->reorder_timeout);
1358 /* Main setsockopt() entry point.
1359 * Does API checks, then calls either the tunnel or session setsockopt
1360 * handler, according to whether the PPPoL2TP socket is a for a regular
1361 * session or the special tunnel type.
1363 static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
1364 char __user *optval, unsigned int optlen)
1366 struct sock *sk = sock->sk;
1367 struct l2tp_session *session;
1368 struct l2tp_tunnel *tunnel;
1369 struct pppol2tp_session *ps;
1373 if (level != SOL_PPPOL2TP)
1376 if (optlen < sizeof(int))
1379 if (get_user(val, (int __user *)optval))
1383 if (sk->sk_user_data == NULL)
1386 /* Get session context from the socket */
1388 session = pppol2tp_sock_to_session(sk);
1389 if (session == NULL)
1392 /* Special case: if session_id == 0x0000, treat as operation on tunnel
1394 ps = l2tp_session_priv(session);
1395 if ((session->session_id == 0) &&
1396 (session->peer_session_id == 0)) {
1398 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1402 err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
1403 sock_put(ps->tunnel_sock);
1405 err = pppol2tp_session_setsockopt(sk, session, optname, val);
1413 /* Tunnel getsockopt helper. Called with sock locked.
1415 static int pppol2tp_tunnel_getsockopt(struct sock *sk,
1416 struct l2tp_tunnel *tunnel,
1417 int optname, int *val)
1422 case PPPOL2TP_SO_DEBUG:
1423 *val = tunnel->debug;
1424 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1425 "%s: get debug=%x\n", tunnel->name, tunnel->debug);
1436 /* Session getsockopt helper. Called with sock locked.
1438 static int pppol2tp_session_getsockopt(struct sock *sk,
1439 struct l2tp_session *session,
1440 int optname, int *val)
1445 case PPPOL2TP_SO_RECVSEQ:
1446 *val = session->recv_seq;
1447 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1448 "%s: get recv_seq=%d\n", session->name, *val);
1451 case PPPOL2TP_SO_SENDSEQ:
1452 *val = session->send_seq;
1453 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1454 "%s: get send_seq=%d\n", session->name, *val);
1457 case PPPOL2TP_SO_LNSMODE:
1458 *val = session->lns_mode;
1459 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1460 "%s: get lns_mode=%d\n", session->name, *val);
1463 case PPPOL2TP_SO_DEBUG:
1464 *val = session->debug;
1465 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1466 "%s: get debug=%d\n", session->name, *val);
1469 case PPPOL2TP_SO_REORDERTO:
1470 *val = (int) jiffies_to_msecs(session->reorder_timeout);
1471 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1472 "%s: get reorder_timeout=%d\n", session->name, *val);
1482 /* Main getsockopt() entry point.
1483 * Does API checks, then calls either the tunnel or session getsockopt
1484 * handler, according to whether the PPPoX socket is a for a regular session
1485 * or the special tunnel type.
1487 static int pppol2tp_getsockopt(struct socket *sock, int level,
1488 int optname, char __user *optval, int __user *optlen)
1490 struct sock *sk = sock->sk;
1491 struct l2tp_session *session;
1492 struct l2tp_tunnel *tunnel;
1495 struct pppol2tp_session *ps;
1497 if (level != SOL_PPPOL2TP)
1500 if (get_user(len, (int __user *) optlen))
1503 len = min_t(unsigned int, len, sizeof(int));
1509 if (sk->sk_user_data == NULL)
1512 /* Get the session context */
1514 session = pppol2tp_sock_to_session(sk);
1515 if (session == NULL)
1518 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1519 ps = l2tp_session_priv(session);
1520 if ((session->session_id == 0) &&
1521 (session->peer_session_id == 0)) {
1523 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1527 err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
1528 sock_put(ps->tunnel_sock);
1532 err = pppol2tp_session_getsockopt(sk, session, optname, &val);
1538 if (put_user(len, (int __user *) optlen))
1541 if (copy_to_user((void __user *) optval, &val, len))
1552 /*****************************************************************************
1553 * /proc filesystem for debug
1554 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1555 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1556 *****************************************************************************/
1558 static unsigned int pppol2tp_net_id;
1560 #ifdef CONFIG_PROC_FS
1562 struct pppol2tp_seq_data {
1563 struct seq_net_private p;
1564 int tunnel_idx; /* current tunnel */
1565 int session_idx; /* index of session within current tunnel */
1566 struct l2tp_tunnel *tunnel;
1567 struct l2tp_session *session; /* NULL means get next tunnel */
1570 static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
1573 pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx);
1576 if (pd->tunnel == NULL)
1579 /* Ignore L2TPv3 tunnels */
1580 if (pd->tunnel->version < 3)
1585 static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
1587 pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx, true);
1590 if (pd->session == NULL) {
1591 pd->session_idx = 0;
1592 pppol2tp_next_tunnel(net, pd);
1596 static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
1598 struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
1605 BUG_ON(m->private == NULL);
1607 net = seq_file_net(m);
1609 if (pd->tunnel == NULL)
1610 pppol2tp_next_tunnel(net, pd);
1612 pppol2tp_next_session(net, pd);
1614 /* NULL tunnel and session indicates end of list */
1615 if ((pd->tunnel == NULL) && (pd->session == NULL))
1622 static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
1628 static void pppol2tp_seq_stop(struct seq_file *p, void *v)
1633 static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
1635 struct l2tp_tunnel *tunnel = v;
1637 seq_printf(m, "\nTUNNEL '%s', %c %d\n",
1639 (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
1640 atomic_read(&tunnel->ref_count) - 1);
1641 seq_printf(m, " %08x %llu/%llu/%llu %llu/%llu/%llu\n",
1643 (unsigned long long)tunnel->stats.tx_packets,
1644 (unsigned long long)tunnel->stats.tx_bytes,
1645 (unsigned long long)tunnel->stats.tx_errors,
1646 (unsigned long long)tunnel->stats.rx_packets,
1647 (unsigned long long)tunnel->stats.rx_bytes,
1648 (unsigned long long)tunnel->stats.rx_errors);
1651 static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
1653 struct l2tp_session *session = v;
1654 struct l2tp_tunnel *tunnel = session->tunnel;
1655 unsigned char state;
1662 struct inet_sock *inet = inet_sk(tunnel->sock);
1663 ip = ntohl(inet->inet_saddr);
1664 port = ntohs(inet->inet_sport);
1667 sk = pppol2tp_session_get_sock(session);
1669 state = sk->sk_state;
1670 user_data_ok = (session == sk->sk_user_data) ? 'Y' : 'N';
1676 seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
1677 "%04X/%04X %d %c\n",
1678 session->name, ip, port,
1680 session->session_id,
1681 tunnel->peer_tunnel_id,
1682 session->peer_session_id,
1683 state, user_data_ok);
1684 seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n",
1685 session->mtu, session->mru,
1686 session->recv_seq ? 'R' : '-',
1687 session->send_seq ? 'S' : '-',
1688 session->lns_mode ? "LNS" : "LAC",
1690 jiffies_to_msecs(session->reorder_timeout));
1691 seq_printf(m, " %hu/%hu %llu/%llu/%llu %llu/%llu/%llu\n",
1692 session->nr, session->ns,
1693 (unsigned long long)session->stats.tx_packets,
1694 (unsigned long long)session->stats.tx_bytes,
1695 (unsigned long long)session->stats.tx_errors,
1696 (unsigned long long)session->stats.rx_packets,
1697 (unsigned long long)session->stats.rx_bytes,
1698 (unsigned long long)session->stats.rx_errors);
1701 struct pppox_sock *po = pppox_sk(sk);
1703 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
1708 static int pppol2tp_seq_show(struct seq_file *m, void *v)
1710 struct pppol2tp_seq_data *pd = v;
1712 /* display header on line 1 */
1713 if (v == SEQ_START_TOKEN) {
1714 seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
1715 seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
1716 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1717 seq_puts(m, " SESSION name, addr/port src-tid/sid "
1718 "dest-tid/sid state user-data-ok\n");
1719 seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1720 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1724 /* Show the tunnel or session context.
1727 pppol2tp_seq_tunnel_show(m, pd->tunnel);
1729 pppol2tp_seq_session_show(m, pd->session);
1730 if (pd->session->deref)
1731 pd->session->deref(pd->session);
1732 l2tp_session_dec_refcount(pd->session);
1739 static const struct seq_operations pppol2tp_seq_ops = {
1740 .start = pppol2tp_seq_start,
1741 .next = pppol2tp_seq_next,
1742 .stop = pppol2tp_seq_stop,
1743 .show = pppol2tp_seq_show,
1746 /* Called when our /proc file is opened. We allocate data for use when
1747 * iterating our tunnel / session contexts and store it in the private
1748 * data of the seq_file.
1750 static int pppol2tp_proc_open(struct inode *inode, struct file *file)
1752 return seq_open_net(inode, file, &pppol2tp_seq_ops,
1753 sizeof(struct pppol2tp_seq_data));
1756 static const struct file_operations pppol2tp_proc_fops = {
1757 .owner = THIS_MODULE,
1758 .open = pppol2tp_proc_open,
1760 .llseek = seq_lseek,
1761 .release = seq_release_net,
1764 #endif /* CONFIG_PROC_FS */
1766 /*****************************************************************************
1768 *****************************************************************************/
1770 static __net_init int pppol2tp_init_net(struct net *net)
1772 struct proc_dir_entry *pde;
1775 pde = proc_net_fops_create(net, "pppol2tp", S_IRUGO, &pppol2tp_proc_fops);
1785 static __net_exit void pppol2tp_exit_net(struct net *net)
1787 proc_net_remove(net, "pppol2tp");
1790 static struct pernet_operations pppol2tp_net_ops = {
1791 .init = pppol2tp_init_net,
1792 .exit = pppol2tp_exit_net,
1793 .id = &pppol2tp_net_id,
1796 /*****************************************************************************
1798 *****************************************************************************/
1800 static const struct proto_ops pppol2tp_ops = {
1802 .owner = THIS_MODULE,
1803 .release = pppol2tp_release,
1804 .bind = sock_no_bind,
1805 .connect = pppol2tp_connect,
1806 .socketpair = sock_no_socketpair,
1807 .accept = sock_no_accept,
1808 .getname = pppol2tp_getname,
1809 .poll = datagram_poll,
1810 .listen = sock_no_listen,
1811 .shutdown = sock_no_shutdown,
1812 .setsockopt = pppol2tp_setsockopt,
1813 .getsockopt = pppol2tp_getsockopt,
1814 .sendmsg = pppol2tp_sendmsg,
1815 .recvmsg = pppol2tp_recvmsg,
1816 .mmap = sock_no_mmap,
1817 .ioctl = pppox_ioctl,
1820 static const struct pppox_proto pppol2tp_proto = {
1821 .create = pppol2tp_create,
1822 .ioctl = pppol2tp_ioctl,
1823 .owner = THIS_MODULE,
1826 #ifdef CONFIG_L2TP_V3
1828 static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = {
1829 .session_create = pppol2tp_session_create,
1830 .session_delete = l2tp_session_delete,
1833 #endif /* CONFIG_L2TP_V3 */
1835 static int __init pppol2tp_init(void)
1839 err = register_pernet_device(&pppol2tp_net_ops);
1843 err = proto_register(&pppol2tp_sk_proto, 0);
1845 goto out_unregister_pppol2tp_pernet;
1847 err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
1849 goto out_unregister_pppol2tp_proto;
1851 #ifdef CONFIG_L2TP_V3
1852 err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops);
1854 goto out_unregister_pppox;
1857 printk(KERN_INFO "PPPoL2TP kernel driver, %s\n",
1858 PPPOL2TP_DRV_VERSION);
1863 #ifdef CONFIG_L2TP_V3
1864 out_unregister_pppox:
1865 unregister_pppox_proto(PX_PROTO_OL2TP);
1867 out_unregister_pppol2tp_proto:
1868 proto_unregister(&pppol2tp_sk_proto);
1869 out_unregister_pppol2tp_pernet:
1870 unregister_pernet_device(&pppol2tp_net_ops);
1874 static void __exit pppol2tp_exit(void)
1876 #ifdef CONFIG_L2TP_V3
1877 l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP);
1879 unregister_pppox_proto(PX_PROTO_OL2TP);
1880 proto_unregister(&pppol2tp_sk_proto);
1881 unregister_pernet_device(&pppol2tp_net_ops);
1884 module_init(pppol2tp_init);
1885 module_exit(pppol2tp_exit);
1887 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1888 MODULE_DESCRIPTION("PPP over L2TP over UDP");
1889 MODULE_LICENSE("GPL");
1890 MODULE_VERSION(PPPOL2TP_DRV_VERSION);