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);
484 /* Really kill the session socket. (Called from sock_put() if
487 static void pppol2tp_session_destruct(struct sock *sk)
489 struct l2tp_session *session;
491 if (sk->sk_user_data != NULL) {
492 session = sk->sk_user_data;
496 sk->sk_user_data = NULL;
497 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
498 l2tp_session_dec_refcount(session);
505 static void pppol2tp_put_sk(struct rcu_head *head)
507 struct pppol2tp_session *ps;
509 ps = container_of(head, typeof(*ps), rcu);
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 if (session != NULL) {
539 struct pppol2tp_session *ps;
541 l2tp_session_delete(session);
543 ps = l2tp_session_priv(session);
544 mutex_lock(&ps->sk_lock);
545 ps->__sk = rcu_dereference_protected(ps->sk,
546 lockdep_is_held(&ps->sk_lock));
547 RCU_INIT_POINTER(ps->sk, NULL);
548 mutex_unlock(&ps->sk_lock);
549 call_rcu(&ps->rcu, pppol2tp_put_sk);
551 /* Rely on the sock_put() call at the end of the function for
552 * dropping the reference held by pppol2tp_sock_to_session().
553 * The last reference will be dropped by pppol2tp_put_sk().
556 skb_queue_purge(&sk->sk_receive_queue);
557 skb_queue_purge(&sk->sk_write_queue);
561 /* This will delete the session context via
562 * pppol2tp_session_destruct() if the socket's refcnt drops to
574 static struct proto pppol2tp_sk_proto = {
576 .owner = THIS_MODULE,
577 .obj_size = sizeof(struct pppox_sock),
580 static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb)
584 rc = l2tp_udp_encap_recv(sk, skb);
588 return NET_RX_SUCCESS;
591 /* socket() handler. Initialize a new struct sock.
593 static int pppol2tp_create(struct net *net, struct socket *sock)
598 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto);
602 sock_init_data(sock, sk);
604 sock->state = SS_UNCONNECTED;
605 sock->ops = &pppol2tp_ops;
607 sk->sk_backlog_rcv = pppol2tp_backlog_recv;
608 sk->sk_protocol = PX_PROTO_OL2TP;
609 sk->sk_family = PF_PPPOX;
610 sk->sk_state = PPPOX_NONE;
611 sk->sk_type = SOCK_STREAM;
612 sk->sk_destruct = pppol2tp_session_destruct;
620 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
621 static void pppol2tp_show(struct seq_file *m, void *arg)
623 struct l2tp_session *session = arg;
626 sk = pppol2tp_session_get_sock(session);
628 struct pppox_sock *po = pppox_sk(sk);
630 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
636 static void pppol2tp_session_init(struct l2tp_session *session)
638 struct pppol2tp_session *ps;
639 struct dst_entry *dst;
641 session->recv_skb = pppol2tp_recv;
642 session->session_close = pppol2tp_session_close;
643 #if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
644 session->show = pppol2tp_show;
647 ps = l2tp_session_priv(session);
648 mutex_init(&ps->sk_lock);
649 ps->tunnel_sock = session->tunnel->sock;
650 ps->owner = current->pid;
652 /* If PMTU discovery was enabled, use the MTU that was discovered */
653 dst = sk_dst_get(session->tunnel->sock);
655 u32 pmtu = dst_mtu(dst);
658 session->mtu = pmtu - PPPOL2TP_HEADER_OVERHEAD;
659 session->mru = pmtu - PPPOL2TP_HEADER_OVERHEAD;
665 /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
667 static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
668 int sockaddr_len, int flags)
670 struct sock *sk = sock->sk;
671 struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr;
672 struct sockaddr_pppol2tpv3 *sp3 = (struct sockaddr_pppol2tpv3 *) uservaddr;
673 struct pppox_sock *po = pppox_sk(sk);
674 struct l2tp_session *session = NULL;
675 struct l2tp_tunnel *tunnel;
676 struct pppol2tp_session *ps;
677 struct l2tp_session_cfg cfg = { 0, };
679 u32 tunnel_id, peer_tunnel_id;
680 u32 session_id, peer_session_id;
681 bool drop_refcnt = false;
682 bool drop_tunnel = false;
689 if (sp->sa_protocol != PX_PROTO_OL2TP)
692 /* Check for already bound sockets */
694 if (sk->sk_state & PPPOX_CONNECTED)
697 /* We don't supporting rebinding anyway */
699 if (sk->sk_user_data)
700 goto end; /* socket is already attached */
702 /* Get params from socket address. Handle L2TPv2 and L2TPv3 */
703 if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) {
704 fd = sp->pppol2tp.fd;
705 tunnel_id = sp->pppol2tp.s_tunnel;
706 peer_tunnel_id = sp->pppol2tp.d_tunnel;
707 session_id = sp->pppol2tp.s_session;
708 peer_session_id = sp->pppol2tp.d_session;
709 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) {
711 fd = sp3->pppol2tp.fd;
712 tunnel_id = sp3->pppol2tp.s_tunnel;
713 peer_tunnel_id = sp3->pppol2tp.d_tunnel;
714 session_id = sp3->pppol2tp.s_session;
715 peer_session_id = sp3->pppol2tp.d_session;
718 goto end; /* bad socket address */
721 /* Don't bind if tunnel_id is 0 */
726 tunnel = l2tp_tunnel_get(sock_net(sk), tunnel_id);
730 /* Special case: create tunnel context if session_id and
731 * peer_session_id is 0. Otherwise look up tunnel using supplied
734 if ((session_id == 0) && (peer_session_id == 0)) {
735 if (tunnel == NULL) {
736 struct l2tp_tunnel_cfg tcfg = {
737 .encap = L2TP_ENCAPTYPE_UDP,
740 error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel);
745 /* Error if we can't find the tunnel */
750 /* Error if socket is not prepped */
751 if (tunnel->sock == NULL)
755 if (tunnel->recv_payload_hook == NULL)
756 tunnel->recv_payload_hook = pppol2tp_recv_payload_hook;
758 if (tunnel->peer_tunnel_id == 0) {
760 tunnel->peer_tunnel_id = sp->pppol2tp.d_tunnel;
762 tunnel->peer_tunnel_id = sp3->pppol2tp.d_tunnel;
765 session = l2tp_session_get(sock_net(sk), tunnel, session_id, false);
768 ps = l2tp_session_priv(session);
770 /* Using a pre-existing session is fine as long as it hasn't
771 * been connected yet.
773 mutex_lock(&ps->sk_lock);
774 if (rcu_dereference_protected(ps->sk,
775 lockdep_is_held(&ps->sk_lock))) {
776 mutex_unlock(&ps->sk_lock);
781 /* consistency checks */
782 if (ps->tunnel_sock != tunnel->sock) {
783 mutex_unlock(&ps->sk_lock);
788 /* Default MTU must allow space for UDP/L2TP/PPP headers */
789 cfg.mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
792 session = l2tp_session_create(sizeof(struct pppol2tp_session),
794 peer_session_id, &cfg);
795 if (IS_ERR(session)) {
796 error = PTR_ERR(session);
800 pppol2tp_session_init(session);
801 ps = l2tp_session_priv(session);
802 l2tp_session_inc_refcount(session);
804 mutex_lock(&ps->sk_lock);
805 error = l2tp_session_register(session, tunnel);
807 mutex_unlock(&ps->sk_lock);
814 /* Special case: if source & dest session_id == 0x0000, this
815 * socket is being created to manage the tunnel. Just set up
816 * the internal context for use by ioctl() and sockopt()
819 if ((session->session_id == 0) &&
820 (session->peer_session_id == 0)) {
825 /* The only header we need to worry about is the L2TP
826 * header. This size is different depending on whether
827 * sequence numbers are enabled for the data channel.
829 po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
831 po->chan.private = sk;
832 po->chan.ops = &pppol2tp_chan_ops;
833 po->chan.mtu = session->mtu;
835 error = ppp_register_net_channel(sock_net(sk), &po->chan);
837 mutex_unlock(&ps->sk_lock);
842 /* This is how we get the session context from the socket. */
843 sk->sk_user_data = session;
844 rcu_assign_pointer(ps->sk, sk);
845 mutex_unlock(&ps->sk_lock);
847 /* Keep the reference we've grabbed on the session: sk doesn't expect
848 * the session to disappear. pppol2tp_session_destruct() is responsible
853 sk->sk_state = PPPOX_CONNECTED;
854 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
855 "%s: created\n", session->name);
859 l2tp_session_dec_refcount(session);
861 l2tp_tunnel_dec_refcount(tunnel);
867 #ifdef CONFIG_L2TP_V3
869 /* Called when creating sessions via the netlink interface. */
870 static int pppol2tp_session_create(struct net *net, struct l2tp_tunnel *tunnel,
871 u32 session_id, u32 peer_session_id,
872 struct l2tp_session_cfg *cfg)
875 struct l2tp_session *session;
877 /* Error if tunnel socket is not prepped */
883 /* Default MTU values. */
885 cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
889 /* Allocate and initialize a new session context. */
890 session = l2tp_session_create(sizeof(struct pppol2tp_session),
892 peer_session_id, cfg);
893 if (IS_ERR(session)) {
894 error = PTR_ERR(session);
898 pppol2tp_session_init(session);
900 error = l2tp_session_register(session, tunnel);
912 #endif /* CONFIG_L2TP_V3 */
914 /* getname() support.
916 static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
917 int *usockaddr_len, int peer)
921 struct l2tp_session *session;
922 struct l2tp_tunnel *tunnel;
923 struct sock *sk = sock->sk;
924 struct inet_sock *inet;
925 struct pppol2tp_session *pls;
930 if (sk->sk_state != PPPOX_CONNECTED)
934 session = pppol2tp_sock_to_session(sk);
938 pls = l2tp_session_priv(session);
939 tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock);
943 inet = inet_sk(tunnel->sock);
944 if (tunnel->version == 2) {
945 struct sockaddr_pppol2tp sp;
948 sp.sa_family = AF_PPPOX;
949 sp.sa_protocol = PX_PROTO_OL2TP;
950 sp.pppol2tp.fd = tunnel->fd;
951 sp.pppol2tp.pid = pls->owner;
952 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
953 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
954 sp.pppol2tp.s_session = session->session_id;
955 sp.pppol2tp.d_session = session->peer_session_id;
956 sp.pppol2tp.addr.sin_family = AF_INET;
957 sp.pppol2tp.addr.sin_port = inet->inet_dport;
958 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
959 memcpy(uaddr, &sp, len);
960 } else if (tunnel->version == 3) {
961 struct sockaddr_pppol2tpv3 sp;
964 sp.sa_family = AF_PPPOX;
965 sp.sa_protocol = PX_PROTO_OL2TP;
966 sp.pppol2tp.fd = tunnel->fd;
967 sp.pppol2tp.pid = pls->owner;
968 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
969 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
970 sp.pppol2tp.s_session = session->session_id;
971 sp.pppol2tp.d_session = session->peer_session_id;
972 sp.pppol2tp.addr.sin_family = AF_INET;
973 sp.pppol2tp.addr.sin_port = inet->inet_dport;
974 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
975 memcpy(uaddr, &sp, len);
978 *usockaddr_len = len;
981 sock_put(pls->tunnel_sock);
988 /****************************************************************************
991 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
992 * sockets. However, in order to control kernel tunnel features, we allow
993 * userspace to create a special "tunnel" PPPoX socket which is used for
994 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
995 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
997 ****************************************************************************/
999 static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest,
1000 struct l2tp_stats *stats)
1002 dest->tx_packets = stats->tx_packets;
1003 dest->tx_bytes = stats->tx_bytes;
1004 dest->tx_errors = stats->tx_errors;
1005 dest->rx_packets = stats->rx_packets;
1006 dest->rx_bytes = stats->rx_bytes;
1007 dest->rx_seq_discards = stats->rx_seq_discards;
1008 dest->rx_oos_packets = stats->rx_oos_packets;
1009 dest->rx_errors = stats->rx_errors;
1012 /* Session ioctl helper.
1014 static int pppol2tp_session_ioctl(struct l2tp_session *session,
1015 unsigned int cmd, unsigned long arg)
1020 int val = (int) arg;
1021 struct pppol2tp_session *ps = l2tp_session_priv(session);
1022 struct l2tp_tunnel *tunnel = session->tunnel;
1023 struct pppol2tp_ioc_stats stats;
1025 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG,
1026 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
1027 session->name, cmd, arg);
1029 sk = pppol2tp_session_get_sock(session);
1036 if (!(sk->sk_state & PPPOX_CONNECTED))
1040 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1042 ifr.ifr_mtu = session->mtu;
1043 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
1046 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1047 "%s: get mtu=%d\n", session->name, session->mtu);
1053 if (!(sk->sk_state & PPPOX_CONNECTED))
1057 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1060 session->mtu = ifr.ifr_mtu;
1062 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1063 "%s: set mtu=%d\n", session->name, session->mtu);
1069 if (!(sk->sk_state & PPPOX_CONNECTED))
1073 if (put_user(session->mru, (int __user *) arg))
1076 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1077 "%s: get mru=%d\n", session->name, session->mru);
1083 if (!(sk->sk_state & PPPOX_CONNECTED))
1087 if (get_user(val, (int __user *) arg))
1091 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1092 "%s: set mru=%d\n", session->name, session->mru);
1098 if (put_user(ps->flags, (int __user *) arg))
1101 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1102 "%s: get flags=%d\n", session->name, ps->flags);
1108 if (get_user(val, (int __user *) arg))
1111 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1112 "%s: set flags=%d\n", session->name, ps->flags);
1116 case PPPIOCGL2TPSTATS:
1118 if (!(sk->sk_state & PPPOX_CONNECTED))
1121 memset(&stats, 0, sizeof(stats));
1122 stats.tunnel_id = tunnel->tunnel_id;
1123 stats.session_id = session->session_id;
1124 pppol2tp_copy_stats(&stats, &session->stats);
1125 if (copy_to_user((void __user *) arg, &stats,
1128 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1129 "%s: get L2TP stats\n", session->name);
1143 /* Tunnel ioctl helper.
1145 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1146 * specifies a session_id, the session ioctl handler is called. This allows an
1147 * application to retrieve session stats via a tunnel socket.
1149 static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
1150 unsigned int cmd, unsigned long arg)
1154 struct pppol2tp_ioc_stats stats;
1156 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG,
1157 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1158 tunnel->name, cmd, arg);
1164 case PPPIOCGL2TPSTATS:
1166 if (!(sk->sk_state & PPPOX_CONNECTED))
1169 if (copy_from_user(&stats, (void __user *) arg,
1174 if (stats.session_id != 0) {
1175 /* resend to session ioctl handler */
1176 struct l2tp_session *session =
1177 l2tp_session_get(sock_net(sk), tunnel,
1178 stats.session_id, true);
1181 err = pppol2tp_session_ioctl(session, cmd,
1184 session->deref(session);
1185 l2tp_session_dec_refcount(session);
1192 stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
1194 pppol2tp_copy_stats(&stats, &tunnel->stats);
1195 if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) {
1199 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1200 "%s: get L2TP stats\n", tunnel->name);
1214 /* Main ioctl() handler.
1215 * Dispatch to tunnel or session helpers depending on the socket.
1217 static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
1220 struct sock *sk = sock->sk;
1221 struct l2tp_session *session;
1222 struct l2tp_tunnel *tunnel;
1223 struct pppol2tp_session *ps;
1230 if (sock_flag(sk, SOCK_DEAD) != 0)
1234 if ((sk->sk_user_data == NULL) ||
1235 (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
1238 /* Get session context from the socket */
1240 session = pppol2tp_sock_to_session(sk);
1241 if (session == NULL)
1244 /* Special case: if session's session_id is zero, treat ioctl as a
1247 ps = l2tp_session_priv(session);
1248 if ((session->session_id == 0) &&
1249 (session->peer_session_id == 0)) {
1251 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1255 err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
1256 sock_put(ps->tunnel_sock);
1260 err = pppol2tp_session_ioctl(session, cmd, arg);
1268 /*****************************************************************************
1269 * setsockopt() / getsockopt() support.
1271 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1272 * sockets. In order to control kernel tunnel features, we allow userspace to
1273 * create a special "tunnel" PPPoX socket which is used for control only.
1274 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1275 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1276 *****************************************************************************/
1278 /* Tunnel setsockopt() helper.
1280 static int pppol2tp_tunnel_setsockopt(struct sock *sk,
1281 struct l2tp_tunnel *tunnel,
1282 int optname, int val)
1287 case PPPOL2TP_SO_DEBUG:
1288 tunnel->debug = val;
1289 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1290 "%s: set debug=%x\n", tunnel->name, tunnel->debug);
1301 /* Session setsockopt helper.
1303 static int pppol2tp_session_setsockopt(struct sock *sk,
1304 struct l2tp_session *session,
1305 int optname, int val)
1310 case PPPOL2TP_SO_RECVSEQ:
1311 if ((val != 0) && (val != 1)) {
1315 session->recv_seq = val ? -1 : 0;
1316 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1317 "%s: set recv_seq=%d\n", session->name, session->recv_seq);
1320 case PPPOL2TP_SO_SENDSEQ:
1321 if ((val != 0) && (val != 1)) {
1325 session->send_seq = val ? -1 : 0;
1327 struct pppox_sock *po = pppox_sk(sk);
1329 po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
1330 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1332 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1333 "%s: set send_seq=%d\n", session->name, session->send_seq);
1336 case PPPOL2TP_SO_LNSMODE:
1337 if ((val != 0) && (val != 1)) {
1341 session->lns_mode = val ? -1 : 0;
1342 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1343 "%s: set lns_mode=%d\n", session->name, session->lns_mode);
1346 case PPPOL2TP_SO_DEBUG:
1347 session->debug = val;
1348 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1349 "%s: set debug=%x\n", session->name, session->debug);
1352 case PPPOL2TP_SO_REORDERTO:
1353 session->reorder_timeout = msecs_to_jiffies(val);
1354 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1355 "%s: set reorder_timeout=%d\n", session->name, session->reorder_timeout);
1366 /* Main setsockopt() entry point.
1367 * Does API checks, then calls either the tunnel or session setsockopt
1368 * handler, according to whether the PPPoL2TP socket is a for a regular
1369 * session or the special tunnel type.
1371 static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
1372 char __user *optval, unsigned int optlen)
1374 struct sock *sk = sock->sk;
1375 struct l2tp_session *session;
1376 struct l2tp_tunnel *tunnel;
1377 struct pppol2tp_session *ps;
1381 if (level != SOL_PPPOL2TP)
1384 if (optlen < sizeof(int))
1387 if (get_user(val, (int __user *)optval))
1391 if (sk->sk_user_data == NULL)
1394 /* Get session context from the socket */
1396 session = pppol2tp_sock_to_session(sk);
1397 if (session == NULL)
1400 /* Special case: if session_id == 0x0000, treat as operation on tunnel
1402 ps = l2tp_session_priv(session);
1403 if ((session->session_id == 0) &&
1404 (session->peer_session_id == 0)) {
1406 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1410 err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
1411 sock_put(ps->tunnel_sock);
1413 err = pppol2tp_session_setsockopt(sk, session, optname, val);
1421 /* Tunnel getsockopt helper. Called with sock locked.
1423 static int pppol2tp_tunnel_getsockopt(struct sock *sk,
1424 struct l2tp_tunnel *tunnel,
1425 int optname, int *val)
1430 case PPPOL2TP_SO_DEBUG:
1431 *val = tunnel->debug;
1432 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1433 "%s: get debug=%x\n", tunnel->name, tunnel->debug);
1444 /* Session getsockopt helper. Called with sock locked.
1446 static int pppol2tp_session_getsockopt(struct sock *sk,
1447 struct l2tp_session *session,
1448 int optname, int *val)
1453 case PPPOL2TP_SO_RECVSEQ:
1454 *val = session->recv_seq;
1455 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1456 "%s: get recv_seq=%d\n", session->name, *val);
1459 case PPPOL2TP_SO_SENDSEQ:
1460 *val = session->send_seq;
1461 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1462 "%s: get send_seq=%d\n", session->name, *val);
1465 case PPPOL2TP_SO_LNSMODE:
1466 *val = session->lns_mode;
1467 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1468 "%s: get lns_mode=%d\n", session->name, *val);
1471 case PPPOL2TP_SO_DEBUG:
1472 *val = session->debug;
1473 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1474 "%s: get debug=%d\n", session->name, *val);
1477 case PPPOL2TP_SO_REORDERTO:
1478 *val = (int) jiffies_to_msecs(session->reorder_timeout);
1479 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1480 "%s: get reorder_timeout=%d\n", session->name, *val);
1490 /* Main getsockopt() entry point.
1491 * Does API checks, then calls either the tunnel or session getsockopt
1492 * handler, according to whether the PPPoX socket is a for a regular session
1493 * or the special tunnel type.
1495 static int pppol2tp_getsockopt(struct socket *sock, int level,
1496 int optname, char __user *optval, int __user *optlen)
1498 struct sock *sk = sock->sk;
1499 struct l2tp_session *session;
1500 struct l2tp_tunnel *tunnel;
1503 struct pppol2tp_session *ps;
1505 if (level != SOL_PPPOL2TP)
1508 if (get_user(len, (int __user *) optlen))
1511 len = min_t(unsigned int, len, sizeof(int));
1517 if (sk->sk_user_data == NULL)
1520 /* Get the session context */
1522 session = pppol2tp_sock_to_session(sk);
1523 if (session == NULL)
1526 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1527 ps = l2tp_session_priv(session);
1528 if ((session->session_id == 0) &&
1529 (session->peer_session_id == 0)) {
1531 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1535 err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
1536 sock_put(ps->tunnel_sock);
1540 err = pppol2tp_session_getsockopt(sk, session, optname, &val);
1546 if (put_user(len, (int __user *) optlen))
1549 if (copy_to_user((void __user *) optval, &val, len))
1560 /*****************************************************************************
1561 * /proc filesystem for debug
1562 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1563 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1564 *****************************************************************************/
1566 static unsigned int pppol2tp_net_id;
1568 #ifdef CONFIG_PROC_FS
1570 struct pppol2tp_seq_data {
1571 struct seq_net_private p;
1572 int tunnel_idx; /* current tunnel */
1573 int session_idx; /* index of session within current tunnel */
1574 struct l2tp_tunnel *tunnel;
1575 struct l2tp_session *session; /* NULL means get next tunnel */
1578 static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
1581 pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx);
1584 if (pd->tunnel == NULL)
1587 /* Ignore L2TPv3 tunnels */
1588 if (pd->tunnel->version < 3)
1593 static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
1595 pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx, true);
1598 if (pd->session == NULL) {
1599 pd->session_idx = 0;
1600 pppol2tp_next_tunnel(net, pd);
1604 static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
1606 struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
1613 BUG_ON(m->private == NULL);
1615 net = seq_file_net(m);
1617 if (pd->tunnel == NULL)
1618 pppol2tp_next_tunnel(net, pd);
1620 pppol2tp_next_session(net, pd);
1622 /* NULL tunnel and session indicates end of list */
1623 if ((pd->tunnel == NULL) && (pd->session == NULL))
1630 static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
1636 static void pppol2tp_seq_stop(struct seq_file *p, void *v)
1641 static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
1643 struct l2tp_tunnel *tunnel = v;
1645 seq_printf(m, "\nTUNNEL '%s', %c %d\n",
1647 (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
1648 atomic_read(&tunnel->ref_count) - 1);
1649 seq_printf(m, " %08x %llu/%llu/%llu %llu/%llu/%llu\n",
1651 (unsigned long long)tunnel->stats.tx_packets,
1652 (unsigned long long)tunnel->stats.tx_bytes,
1653 (unsigned long long)tunnel->stats.tx_errors,
1654 (unsigned long long)tunnel->stats.rx_packets,
1655 (unsigned long long)tunnel->stats.rx_bytes,
1656 (unsigned long long)tunnel->stats.rx_errors);
1659 static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
1661 struct l2tp_session *session = v;
1662 struct l2tp_tunnel *tunnel = session->tunnel;
1663 unsigned char state;
1670 struct inet_sock *inet = inet_sk(tunnel->sock);
1671 ip = ntohl(inet->inet_saddr);
1672 port = ntohs(inet->inet_sport);
1675 sk = pppol2tp_session_get_sock(session);
1677 state = sk->sk_state;
1678 user_data_ok = (session == sk->sk_user_data) ? 'Y' : 'N';
1684 seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
1685 "%04X/%04X %d %c\n",
1686 session->name, ip, port,
1688 session->session_id,
1689 tunnel->peer_tunnel_id,
1690 session->peer_session_id,
1691 state, user_data_ok);
1692 seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n",
1693 session->mtu, session->mru,
1694 session->recv_seq ? 'R' : '-',
1695 session->send_seq ? 'S' : '-',
1696 session->lns_mode ? "LNS" : "LAC",
1698 jiffies_to_msecs(session->reorder_timeout));
1699 seq_printf(m, " %hu/%hu %llu/%llu/%llu %llu/%llu/%llu\n",
1700 session->nr, session->ns,
1701 (unsigned long long)session->stats.tx_packets,
1702 (unsigned long long)session->stats.tx_bytes,
1703 (unsigned long long)session->stats.tx_errors,
1704 (unsigned long long)session->stats.rx_packets,
1705 (unsigned long long)session->stats.rx_bytes,
1706 (unsigned long long)session->stats.rx_errors);
1709 struct pppox_sock *po = pppox_sk(sk);
1711 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
1716 static int pppol2tp_seq_show(struct seq_file *m, void *v)
1718 struct pppol2tp_seq_data *pd = v;
1720 /* display header on line 1 */
1721 if (v == SEQ_START_TOKEN) {
1722 seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
1723 seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
1724 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1725 seq_puts(m, " SESSION name, addr/port src-tid/sid "
1726 "dest-tid/sid state user-data-ok\n");
1727 seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1728 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1732 /* Show the tunnel or session context.
1735 pppol2tp_seq_tunnel_show(m, pd->tunnel);
1737 pppol2tp_seq_session_show(m, pd->session);
1738 if (pd->session->deref)
1739 pd->session->deref(pd->session);
1740 l2tp_session_dec_refcount(pd->session);
1747 static const struct seq_operations pppol2tp_seq_ops = {
1748 .start = pppol2tp_seq_start,
1749 .next = pppol2tp_seq_next,
1750 .stop = pppol2tp_seq_stop,
1751 .show = pppol2tp_seq_show,
1754 /* Called when our /proc file is opened. We allocate data for use when
1755 * iterating our tunnel / session contexts and store it in the private
1756 * data of the seq_file.
1758 static int pppol2tp_proc_open(struct inode *inode, struct file *file)
1760 return seq_open_net(inode, file, &pppol2tp_seq_ops,
1761 sizeof(struct pppol2tp_seq_data));
1764 static const struct file_operations pppol2tp_proc_fops = {
1765 .owner = THIS_MODULE,
1766 .open = pppol2tp_proc_open,
1768 .llseek = seq_lseek,
1769 .release = seq_release_net,
1772 #endif /* CONFIG_PROC_FS */
1774 /*****************************************************************************
1776 *****************************************************************************/
1778 static __net_init int pppol2tp_init_net(struct net *net)
1780 struct proc_dir_entry *pde;
1783 pde = proc_net_fops_create(net, "pppol2tp", S_IRUGO, &pppol2tp_proc_fops);
1793 static __net_exit void pppol2tp_exit_net(struct net *net)
1795 proc_net_remove(net, "pppol2tp");
1798 static struct pernet_operations pppol2tp_net_ops = {
1799 .init = pppol2tp_init_net,
1800 .exit = pppol2tp_exit_net,
1801 .id = &pppol2tp_net_id,
1804 /*****************************************************************************
1806 *****************************************************************************/
1808 static const struct proto_ops pppol2tp_ops = {
1810 .owner = THIS_MODULE,
1811 .release = pppol2tp_release,
1812 .bind = sock_no_bind,
1813 .connect = pppol2tp_connect,
1814 .socketpair = sock_no_socketpair,
1815 .accept = sock_no_accept,
1816 .getname = pppol2tp_getname,
1817 .poll = datagram_poll,
1818 .listen = sock_no_listen,
1819 .shutdown = sock_no_shutdown,
1820 .setsockopt = pppol2tp_setsockopt,
1821 .getsockopt = pppol2tp_getsockopt,
1822 .sendmsg = pppol2tp_sendmsg,
1823 .recvmsg = pppol2tp_recvmsg,
1824 .mmap = sock_no_mmap,
1825 .ioctl = pppox_ioctl,
1828 static const struct pppox_proto pppol2tp_proto = {
1829 .create = pppol2tp_create,
1830 .ioctl = pppol2tp_ioctl,
1831 .owner = THIS_MODULE,
1834 #ifdef CONFIG_L2TP_V3
1836 static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = {
1837 .session_create = pppol2tp_session_create,
1838 .session_delete = l2tp_session_delete,
1841 #endif /* CONFIG_L2TP_V3 */
1843 static int __init pppol2tp_init(void)
1847 err = register_pernet_device(&pppol2tp_net_ops);
1851 err = proto_register(&pppol2tp_sk_proto, 0);
1853 goto out_unregister_pppol2tp_pernet;
1855 err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
1857 goto out_unregister_pppol2tp_proto;
1859 #ifdef CONFIG_L2TP_V3
1860 err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops);
1862 goto out_unregister_pppox;
1865 printk(KERN_INFO "PPPoL2TP kernel driver, %s\n",
1866 PPPOL2TP_DRV_VERSION);
1871 #ifdef CONFIG_L2TP_V3
1872 out_unregister_pppox:
1873 unregister_pppox_proto(PX_PROTO_OL2TP);
1875 out_unregister_pppol2tp_proto:
1876 proto_unregister(&pppol2tp_sk_proto);
1877 out_unregister_pppol2tp_pernet:
1878 unregister_pernet_device(&pppol2tp_net_ops);
1882 static void __exit pppol2tp_exit(void)
1884 #ifdef CONFIG_L2TP_V3
1885 l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP);
1887 unregister_pppox_proto(PX_PROTO_OL2TP);
1888 proto_unregister(&pppol2tp_sk_proto);
1889 unregister_pernet_device(&pppol2tp_net_ops);
1892 module_init(pppol2tp_init);
1893 module_exit(pppol2tp_exit);
1895 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1896 MODULE_DESCRIPTION("PPP over L2TP over UDP");
1897 MODULE_LICENSE("GPL");
1898 MODULE_VERSION(PPPOL2TP_DRV_VERSION);