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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
62 #include <linux/module.h>
63 #include <linux/string.h>
64 #include <linux/list.h>
65 #include <linux/uaccess.h>
67 #include <linux/kernel.h>
68 #include <linux/spinlock.h>
69 #include <linux/kthread.h>
70 #include <linux/sched.h>
71 #include <linux/slab.h>
72 #include <linux/errno.h>
73 #include <linux/jiffies.h>
75 #include <linux/netdevice.h>
76 #include <linux/net.h>
77 #include <linux/inetdevice.h>
78 #include <linux/skbuff.h>
79 #include <linux/init.h>
81 #include <linux/udp.h>
82 #include <linux/if_pppox.h>
83 #include <linux/if_pppol2tp.h>
85 #include <linux/ppp_channel.h>
86 #include <linux/ppp_defs.h>
87 #include <linux/ppp-ioctl.h>
88 #include <linux/file.h>
89 #include <linux/hash.h>
90 #include <linux/sort.h>
91 #include <linux/proc_fs.h>
92 #include <linux/l2tp.h>
93 #include <linux/nsproxy.h>
94 #include <net/net_namespace.h>
95 #include <net/netns/generic.h>
100 #include <net/inet_common.h>
102 #include <asm/byteorder.h>
103 #include <linux/atomic.h>
105 #include "l2tp_core.h"
107 #define PPPOL2TP_DRV_VERSION "V2.0"
109 /* Space for UDP, L2TP and PPP headers */
110 #define PPPOL2TP_HEADER_OVERHEAD 40
112 /* Number of bytes to build transmit L2TP headers.
113 * Unfortunately the size is different depending on whether sequence numbers
116 #define PPPOL2TP_L2TP_HDR_SIZE_SEQ 10
117 #define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ 6
119 /* Private data of each session. This data lives at the end of struct
120 * l2tp_session, referenced via session->priv[].
122 struct pppol2tp_session {
123 int owner; /* pid that opened the socket */
125 struct mutex sk_lock; /* Protects .sk */
126 struct sock __rcu *sk; /* Pointer to the session
128 struct sock *__sk; /* Copy of .sk, for cleanup */
129 struct rcu_head rcu; /* For asynchronous release */
130 int flags; /* accessed by PPPIOCGFLAGS.
134 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb);
136 static const struct ppp_channel_ops pppol2tp_chan_ops = {
137 .start_xmit = pppol2tp_xmit,
140 static const struct proto_ops pppol2tp_ops;
142 /* Retrieves the pppol2tp socket associated to a session.
143 * A reference is held on the returned socket, so this function must be paired
146 static struct sock *pppol2tp_session_get_sock(struct l2tp_session *session)
148 struct pppol2tp_session *ps = l2tp_session_priv(session);
152 sk = rcu_dereference(ps->sk);
160 /* Helpers to obtain tunnel/session contexts from sockets.
162 static inline struct l2tp_session *pppol2tp_sock_to_session(struct sock *sk)
164 struct l2tp_session *session;
170 session = (struct l2tp_session *)(sk->sk_user_data);
171 if (session == NULL) {
176 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
182 /*****************************************************************************
183 * Receive data handling
184 *****************************************************************************/
186 static int pppol2tp_recv_payload_hook(struct sk_buff *skb)
188 /* Skip PPP header, if present. In testing, Microsoft L2TP clients
189 * don't send the PPP header (PPP header compression enabled), but
190 * other clients can include the header. So we cope with both cases
191 * here. The PPP header is always FF03 when using L2TP.
193 * Note that skb->data[] isn't dereferenced from a u16 ptr here since
194 * the field may be unaligned.
196 if (!pskb_may_pull(skb, 2))
199 if ((skb->data[0] == PPP_ALLSTATIONS) && (skb->data[1] == PPP_UI))
205 /* Receive message. This is the recvmsg for the PPPoL2TP socket.
207 static int pppol2tp_recvmsg(struct socket *sock, struct msghdr *msg,
208 size_t len, int flags)
212 struct sock *sk = sock->sk;
215 if (sk->sk_state & PPPOX_BOUND)
219 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
220 flags & MSG_DONTWAIT, &err);
226 else if (len < skb->len)
227 msg->msg_flags |= MSG_TRUNC;
229 err = skb_copy_datagram_msg(skb, 0, msg, len);
230 if (likely(err == 0))
238 static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
240 struct pppol2tp_session *ps = l2tp_session_priv(session);
241 struct sock *sk = NULL;
243 /* If the socket is bound, send it in to PPP's input queue. Otherwise
244 * queue it on the session socket.
247 sk = rcu_dereference(ps->sk);
251 if (sk->sk_state & PPPOX_BOUND) {
252 struct pppox_sock *po;
254 l2tp_dbg(session, L2TP_MSG_DATA,
255 "%s: recv %d byte data frame, passing to ppp\n",
256 session->name, data_len);
259 ppp_input(&po->chan, skb);
261 l2tp_dbg(session, L2TP_MSG_DATA,
262 "%s: recv %d byte data frame, passing to L2TP socket\n",
263 session->name, data_len);
265 if (sock_queue_rcv_skb(sk, skb) < 0) {
266 atomic_long_inc(&session->stats.rx_errors);
276 l2tp_info(session, L2TP_MSG_DATA, "%s: no socket\n", session->name);
280 /************************************************************************
282 ***********************************************************************/
284 /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here
285 * when a user application does a sendmsg() on the session socket. L2TP and
286 * PPP headers must be inserted into the user's data.
288 static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m,
291 struct sock *sk = sock->sk;
294 struct l2tp_session *session;
295 struct l2tp_tunnel *tunnel;
299 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
302 /* Get session and tunnel contexts */
304 session = pppol2tp_sock_to_session(sk);
308 tunnel = session->tunnel;
310 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
312 /* Allocate a socket buffer */
314 skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) +
315 uhlen + session->hdr_len +
316 2 + total_len, /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */
321 /* Reserve space for headers. */
322 skb_reserve(skb, NET_SKB_PAD);
323 skb_reset_network_header(skb);
324 skb_reserve(skb, sizeof(struct iphdr));
325 skb_reset_transport_header(skb);
326 skb_reserve(skb, uhlen);
329 skb->data[0] = PPP_ALLSTATIONS;
330 skb->data[1] = PPP_UI;
333 /* Copy user data into skb */
334 error = memcpy_from_msg(skb_put(skb, total_len), m, total_len);
341 l2tp_xmit_skb(session, skb, session->hdr_len);
354 /* Transmit function called by generic PPP driver. Sends PPP frame
355 * over PPPoL2TP socket.
357 * This is almost the same as pppol2tp_sendmsg(), but rather than
358 * being called with a msghdr from userspace, it is called with a skb
361 * The supplied skb from ppp doesn't have enough headroom for the
362 * insertion of L2TP, UDP and IP headers so we need to allocate more
363 * headroom in the skb. This will create a cloned skb. But we must be
364 * careful in the error case because the caller will expect to free
365 * the skb it supplied, not our cloned skb. So we take care to always
366 * leave the original skb unfreed if we return an error.
368 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
370 struct sock *sk = (struct sock *) chan->private;
371 struct l2tp_session *session;
372 struct l2tp_tunnel *tunnel;
375 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
378 /* Get session and tunnel contexts from the socket */
379 session = pppol2tp_sock_to_session(sk);
383 tunnel = session->tunnel;
385 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
386 headroom = NET_SKB_PAD +
387 sizeof(struct iphdr) + /* IP header */
388 uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */
389 session->hdr_len + /* L2TP header */
390 2; /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */
391 if (skb_cow_head(skb, headroom))
394 /* Setup PPP header */
396 skb->data[0] = PPP_ALLSTATIONS;
397 skb->data[1] = PPP_UI;
400 l2tp_xmit_skb(session, skb, session->hdr_len);
410 /* Free the original skb */
415 /*****************************************************************************
416 * Session (and tunnel control) socket create/destroy.
417 *****************************************************************************/
419 static void pppol2tp_put_sk(struct rcu_head *head)
421 struct pppol2tp_session *ps;
423 ps = container_of(head, typeof(*ps), rcu);
427 /* Called by l2tp_core when a session socket is being closed.
429 static void pppol2tp_session_close(struct l2tp_session *session)
433 /* Really kill the session socket. (Called from sock_put() if
436 static void pppol2tp_session_destruct(struct sock *sk)
438 struct l2tp_session *session = sk->sk_user_data;
440 skb_queue_purge(&sk->sk_receive_queue);
441 skb_queue_purge(&sk->sk_write_queue);
444 sk->sk_user_data = NULL;
445 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
446 l2tp_session_dec_refcount(session);
450 /* Called when the PPPoX socket (session) is closed.
452 static int pppol2tp_release(struct socket *sock)
454 struct sock *sk = sock->sk;
455 struct l2tp_session *session;
463 if (sock_flag(sk, SOCK_DEAD) != 0)
466 pppox_unbind_sock(sk);
468 /* Signal the death of the socket. */
469 sk->sk_state = PPPOX_DEAD;
473 session = pppol2tp_sock_to_session(sk);
475 struct pppol2tp_session *ps;
477 l2tp_session_delete(session);
479 ps = l2tp_session_priv(session);
480 mutex_lock(&ps->sk_lock);
481 ps->__sk = rcu_dereference_protected(ps->sk,
482 lockdep_is_held(&ps->sk_lock));
483 RCU_INIT_POINTER(ps->sk, NULL);
484 mutex_unlock(&ps->sk_lock);
485 call_rcu(&ps->rcu, pppol2tp_put_sk);
487 /* Rely on the sock_put() call at the end of the function for
488 * dropping the reference held by pppol2tp_sock_to_session().
489 * The last reference will be dropped by pppol2tp_put_sk().
495 /* This will delete the session context via
496 * pppol2tp_session_destruct() if the socket's refcnt drops to
508 static struct proto pppol2tp_sk_proto = {
510 .owner = THIS_MODULE,
511 .obj_size = sizeof(struct pppox_sock),
514 static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb)
518 rc = l2tp_udp_encap_recv(sk, skb);
522 return NET_RX_SUCCESS;
525 /* socket() handler. Initialize a new struct sock.
527 static int pppol2tp_create(struct net *net, struct socket *sock, int kern)
532 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto, kern);
536 sock_init_data(sock, sk);
538 sock->state = SS_UNCONNECTED;
539 sock->ops = &pppol2tp_ops;
541 sk->sk_backlog_rcv = pppol2tp_backlog_recv;
542 sk->sk_protocol = PX_PROTO_OL2TP;
543 sk->sk_family = PF_PPPOX;
544 sk->sk_state = PPPOX_NONE;
545 sk->sk_type = SOCK_STREAM;
546 sk->sk_destruct = pppol2tp_session_destruct;
554 #if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
555 static void pppol2tp_show(struct seq_file *m, void *arg)
557 struct l2tp_session *session = arg;
560 sk = pppol2tp_session_get_sock(session);
562 struct pppox_sock *po = pppox_sk(sk);
564 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
570 static void pppol2tp_session_init(struct l2tp_session *session)
572 struct pppol2tp_session *ps;
573 struct dst_entry *dst;
575 session->recv_skb = pppol2tp_recv;
576 session->session_close = pppol2tp_session_close;
577 #if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
578 session->show = pppol2tp_show;
581 ps = l2tp_session_priv(session);
582 mutex_init(&ps->sk_lock);
583 ps->owner = current->pid;
585 /* If PMTU discovery was enabled, use the MTU that was discovered */
586 dst = sk_dst_get(session->tunnel->sock);
588 u32 pmtu = dst_mtu(dst);
591 session->mtu = pmtu - PPPOL2TP_HEADER_OVERHEAD;
592 session->mru = pmtu - PPPOL2TP_HEADER_OVERHEAD;
598 /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
600 static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
601 int sockaddr_len, int flags)
603 struct sock *sk = sock->sk;
604 struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr;
605 struct pppox_sock *po = pppox_sk(sk);
606 struct l2tp_session *session = NULL;
607 struct l2tp_tunnel *tunnel;
608 struct pppol2tp_session *ps;
609 struct l2tp_session_cfg cfg = { 0, };
611 u32 tunnel_id, peer_tunnel_id;
612 u32 session_id, peer_session_id;
613 bool drop_refcnt = false;
614 bool drop_tunnel = false;
622 if (sockaddr_len != sizeof(struct sockaddr_pppol2tp) &&
623 sockaddr_len != sizeof(struct sockaddr_pppol2tpv3) &&
624 sockaddr_len != sizeof(struct sockaddr_pppol2tpin6) &&
625 sockaddr_len != sizeof(struct sockaddr_pppol2tpv3in6))
628 if (sp->sa_protocol != PX_PROTO_OL2TP)
631 /* Check for already bound sockets */
633 if (sk->sk_state & PPPOX_CONNECTED)
636 /* We don't supporting rebinding anyway */
638 if (sk->sk_user_data)
639 goto end; /* socket is already attached */
641 /* Get params from socket address. Handle L2TPv2 and L2TPv3.
642 * This is nasty because there are different sockaddr_pppol2tp
643 * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use
644 * the sockaddr size to determine which structure the caller
648 if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) {
649 fd = sp->pppol2tp.fd;
650 tunnel_id = sp->pppol2tp.s_tunnel;
651 peer_tunnel_id = sp->pppol2tp.d_tunnel;
652 session_id = sp->pppol2tp.s_session;
653 peer_session_id = sp->pppol2tp.d_session;
654 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) {
655 struct sockaddr_pppol2tpv3 *sp3 =
656 (struct sockaddr_pppol2tpv3 *) sp;
658 fd = sp3->pppol2tp.fd;
659 tunnel_id = sp3->pppol2tp.s_tunnel;
660 peer_tunnel_id = sp3->pppol2tp.d_tunnel;
661 session_id = sp3->pppol2tp.s_session;
662 peer_session_id = sp3->pppol2tp.d_session;
663 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpin6)) {
664 struct sockaddr_pppol2tpin6 *sp6 =
665 (struct sockaddr_pppol2tpin6 *) sp;
666 fd = sp6->pppol2tp.fd;
667 tunnel_id = sp6->pppol2tp.s_tunnel;
668 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
669 session_id = sp6->pppol2tp.s_session;
670 peer_session_id = sp6->pppol2tp.d_session;
671 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3in6)) {
672 struct sockaddr_pppol2tpv3in6 *sp6 =
673 (struct sockaddr_pppol2tpv3in6 *) sp;
675 fd = sp6->pppol2tp.fd;
676 tunnel_id = sp6->pppol2tp.s_tunnel;
677 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
678 session_id = sp6->pppol2tp.s_session;
679 peer_session_id = sp6->pppol2tp.d_session;
682 goto end; /* bad socket address */
685 /* Don't bind if tunnel_id is 0 */
690 tunnel = l2tp_tunnel_get(sock_net(sk), tunnel_id);
694 /* Special case: create tunnel context if session_id and
695 * peer_session_id is 0. Otherwise look up tunnel using supplied
698 if ((session_id == 0) && (peer_session_id == 0)) {
699 if (tunnel == NULL) {
700 struct l2tp_tunnel_cfg tcfg = {
701 .encap = L2TP_ENCAPTYPE_UDP,
704 error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel);
708 l2tp_tunnel_inc_refcount(tunnel);
709 error = l2tp_tunnel_register(tunnel, sock_net(sk),
718 /* Error if we can't find the tunnel */
723 /* Error if socket is not prepped */
724 if (tunnel->sock == NULL)
728 if (tunnel->recv_payload_hook == NULL)
729 tunnel->recv_payload_hook = pppol2tp_recv_payload_hook;
731 if (tunnel->peer_tunnel_id == 0)
732 tunnel->peer_tunnel_id = peer_tunnel_id;
734 session = l2tp_session_get(sock_net(sk), tunnel, session_id);
737 ps = l2tp_session_priv(session);
739 /* Using a pre-existing session is fine as long as it hasn't
740 * been connected yet.
742 mutex_lock(&ps->sk_lock);
743 if (rcu_dereference_protected(ps->sk,
744 lockdep_is_held(&ps->sk_lock)) ||
746 mutex_unlock(&ps->sk_lock);
751 /* Default MTU must allow space for UDP/L2TP/PPP headers */
752 cfg.mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
755 session = l2tp_session_create(sizeof(struct pppol2tp_session),
757 peer_session_id, &cfg);
758 if (IS_ERR(session)) {
759 error = PTR_ERR(session);
763 pppol2tp_session_init(session);
764 ps = l2tp_session_priv(session);
765 l2tp_session_inc_refcount(session);
767 mutex_lock(&ps->sk_lock);
768 error = l2tp_session_register(session, tunnel);
770 mutex_unlock(&ps->sk_lock);
777 /* Special case: if source & dest session_id == 0x0000, this
778 * socket is being created to manage the tunnel. Just set up
779 * the internal context for use by ioctl() and sockopt()
782 if ((session->session_id == 0) &&
783 (session->peer_session_id == 0)) {
788 /* The only header we need to worry about is the L2TP
789 * header. This size is different depending on whether
790 * sequence numbers are enabled for the data channel.
792 po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
794 po->chan.private = sk;
795 po->chan.ops = &pppol2tp_chan_ops;
796 po->chan.mtu = session->mtu;
798 error = ppp_register_net_channel(sock_net(sk), &po->chan);
800 mutex_unlock(&ps->sk_lock);
805 /* This is how we get the session context from the socket. */
806 sk->sk_user_data = session;
807 rcu_assign_pointer(ps->sk, sk);
808 mutex_unlock(&ps->sk_lock);
810 /* Keep the reference we've grabbed on the session: sk doesn't expect
811 * the session to disappear. pppol2tp_session_destruct() is responsible
816 sk->sk_state = PPPOX_CONNECTED;
817 l2tp_info(session, L2TP_MSG_CONTROL, "%s: created\n",
822 l2tp_session_dec_refcount(session);
824 l2tp_tunnel_dec_refcount(tunnel);
830 #ifdef CONFIG_L2TP_V3
832 /* Called when creating sessions via the netlink interface. */
833 static int pppol2tp_session_create(struct net *net, struct l2tp_tunnel *tunnel,
834 u32 session_id, u32 peer_session_id,
835 struct l2tp_session_cfg *cfg)
838 struct l2tp_session *session;
840 /* Error if tunnel socket is not prepped */
846 /* Default MTU values. */
848 cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
852 /* Allocate and initialize a new session context. */
853 session = l2tp_session_create(sizeof(struct pppol2tp_session),
855 peer_session_id, cfg);
856 if (IS_ERR(session)) {
857 error = PTR_ERR(session);
861 pppol2tp_session_init(session);
863 error = l2tp_session_register(session, tunnel);
875 #endif /* CONFIG_L2TP_V3 */
877 /* getname() support.
879 static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
884 struct l2tp_session *session;
885 struct l2tp_tunnel *tunnel;
886 struct sock *sk = sock->sk;
887 struct inet_sock *inet;
888 struct pppol2tp_session *pls;
893 if (!(sk->sk_state & PPPOX_CONNECTED))
897 session = pppol2tp_sock_to_session(sk);
901 pls = l2tp_session_priv(session);
902 tunnel = session->tunnel;
904 inet = inet_sk(tunnel->sock);
905 if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) {
906 struct sockaddr_pppol2tp sp;
909 sp.sa_family = AF_PPPOX;
910 sp.sa_protocol = PX_PROTO_OL2TP;
911 sp.pppol2tp.fd = tunnel->fd;
912 sp.pppol2tp.pid = pls->owner;
913 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
914 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
915 sp.pppol2tp.s_session = session->session_id;
916 sp.pppol2tp.d_session = session->peer_session_id;
917 sp.pppol2tp.addr.sin_family = AF_INET;
918 sp.pppol2tp.addr.sin_port = inet->inet_dport;
919 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
920 memcpy(uaddr, &sp, len);
921 #if IS_ENABLED(CONFIG_IPV6)
922 } else if ((tunnel->version == 2) &&
923 (tunnel->sock->sk_family == AF_INET6)) {
924 struct sockaddr_pppol2tpin6 sp;
928 sp.sa_family = AF_PPPOX;
929 sp.sa_protocol = PX_PROTO_OL2TP;
930 sp.pppol2tp.fd = tunnel->fd;
931 sp.pppol2tp.pid = pls->owner;
932 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
933 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
934 sp.pppol2tp.s_session = session->session_id;
935 sp.pppol2tp.d_session = session->peer_session_id;
936 sp.pppol2tp.addr.sin6_family = AF_INET6;
937 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
938 memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
939 sizeof(tunnel->sock->sk_v6_daddr));
940 memcpy(uaddr, &sp, len);
941 } else if ((tunnel->version == 3) &&
942 (tunnel->sock->sk_family == AF_INET6)) {
943 struct sockaddr_pppol2tpv3in6 sp;
947 sp.sa_family = AF_PPPOX;
948 sp.sa_protocol = PX_PROTO_OL2TP;
949 sp.pppol2tp.fd = tunnel->fd;
950 sp.pppol2tp.pid = pls->owner;
951 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
952 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
953 sp.pppol2tp.s_session = session->session_id;
954 sp.pppol2tp.d_session = session->peer_session_id;
955 sp.pppol2tp.addr.sin6_family = AF_INET6;
956 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
957 memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
958 sizeof(tunnel->sock->sk_v6_daddr));
959 memcpy(uaddr, &sp, len);
961 } else if (tunnel->version == 3) {
962 struct sockaddr_pppol2tpv3 sp;
965 sp.sa_family = AF_PPPOX;
966 sp.sa_protocol = PX_PROTO_OL2TP;
967 sp.pppol2tp.fd = tunnel->fd;
968 sp.pppol2tp.pid = pls->owner;
969 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
970 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
971 sp.pppol2tp.s_session = session->session_id;
972 sp.pppol2tp.d_session = session->peer_session_id;
973 sp.pppol2tp.addr.sin_family = AF_INET;
974 sp.pppol2tp.addr.sin_port = inet->inet_dport;
975 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
976 memcpy(uaddr, &sp, len);
986 /****************************************************************************
989 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
990 * sockets. However, in order to control kernel tunnel features, we allow
991 * userspace to create a special "tunnel" PPPoX socket which is used for
992 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
993 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
995 ****************************************************************************/
997 static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest,
998 struct l2tp_stats *stats)
1000 dest->tx_packets = atomic_long_read(&stats->tx_packets);
1001 dest->tx_bytes = atomic_long_read(&stats->tx_bytes);
1002 dest->tx_errors = atomic_long_read(&stats->tx_errors);
1003 dest->rx_packets = atomic_long_read(&stats->rx_packets);
1004 dest->rx_bytes = atomic_long_read(&stats->rx_bytes);
1005 dest->rx_seq_discards = atomic_long_read(&stats->rx_seq_discards);
1006 dest->rx_oos_packets = atomic_long_read(&stats->rx_oos_packets);
1007 dest->rx_errors = atomic_long_read(&stats->rx_errors);
1010 /* Session ioctl helper.
1012 static int pppol2tp_session_ioctl(struct l2tp_session *session,
1013 unsigned int cmd, unsigned long arg)
1018 int val = (int) arg;
1019 struct pppol2tp_session *ps = l2tp_session_priv(session);
1020 struct l2tp_tunnel *tunnel = session->tunnel;
1021 struct pppol2tp_ioc_stats stats;
1023 l2tp_dbg(session, L2TP_MSG_CONTROL,
1024 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
1025 session->name, cmd, arg);
1027 sk = pppol2tp_session_get_sock(session);
1034 if (!(sk->sk_state & PPPOX_CONNECTED))
1038 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1040 ifr.ifr_mtu = session->mtu;
1041 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
1044 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mtu=%d\n",
1045 session->name, session->mtu);
1051 if (!(sk->sk_state & PPPOX_CONNECTED))
1055 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1058 session->mtu = ifr.ifr_mtu;
1060 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mtu=%d\n",
1061 session->name, session->mtu);
1067 if (!(sk->sk_state & PPPOX_CONNECTED))
1071 if (put_user(session->mru, (int __user *) arg))
1074 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mru=%d\n",
1075 session->name, session->mru);
1081 if (!(sk->sk_state & PPPOX_CONNECTED))
1085 if (get_user(val, (int __user *) arg))
1089 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mru=%d\n",
1090 session->name, session->mru);
1096 if (put_user(ps->flags, (int __user *) arg))
1099 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get flags=%d\n",
1100 session->name, ps->flags);
1106 if (get_user(val, (int __user *) arg))
1109 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set flags=%d\n",
1110 session->name, ps->flags);
1114 case PPPIOCGL2TPSTATS:
1116 if (!(sk->sk_state & PPPOX_CONNECTED))
1119 memset(&stats, 0, sizeof(stats));
1120 stats.tunnel_id = tunnel->tunnel_id;
1121 stats.session_id = session->session_id;
1122 pppol2tp_copy_stats(&stats, &session->stats);
1123 if (copy_to_user((void __user *) arg, &stats,
1126 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1141 /* Tunnel ioctl helper.
1143 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1144 * specifies a session_id, the session ioctl handler is called. This allows an
1145 * application to retrieve session stats via a tunnel socket.
1147 static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
1148 unsigned int cmd, unsigned long arg)
1152 struct pppol2tp_ioc_stats stats;
1154 l2tp_dbg(tunnel, L2TP_MSG_CONTROL,
1155 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1156 tunnel->name, cmd, arg);
1162 case PPPIOCGL2TPSTATS:
1164 if (!(sk->sk_state & PPPOX_CONNECTED))
1167 if (copy_from_user(&stats, (void __user *) arg,
1172 if (stats.session_id != 0) {
1173 /* resend to session ioctl handler */
1174 struct l2tp_session *session =
1175 l2tp_session_get(sock_net(sk), tunnel,
1179 err = pppol2tp_session_ioctl(session, cmd,
1181 l2tp_session_dec_refcount(session);
1188 stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
1190 pppol2tp_copy_stats(&stats, &tunnel->stats);
1191 if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) {
1195 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1210 /* Main ioctl() handler.
1211 * Dispatch to tunnel or session helpers depending on the socket.
1213 static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
1216 struct sock *sk = sock->sk;
1217 struct l2tp_session *session;
1218 struct l2tp_tunnel *tunnel;
1225 if (sock_flag(sk, SOCK_DEAD) != 0)
1229 if ((sk->sk_user_data == NULL) ||
1230 (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
1233 /* Get session context from the socket */
1235 session = pppol2tp_sock_to_session(sk);
1236 if (session == NULL)
1239 /* Special case: if session's session_id is zero, treat ioctl as a
1242 if ((session->session_id == 0) &&
1243 (session->peer_session_id == 0)) {
1244 tunnel = session->tunnel;
1245 err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
1249 err = pppol2tp_session_ioctl(session, cmd, arg);
1257 /*****************************************************************************
1258 * setsockopt() / getsockopt() support.
1260 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1261 * sockets. In order to control kernel tunnel features, we allow userspace to
1262 * create a special "tunnel" PPPoX socket which is used for control only.
1263 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1264 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1265 *****************************************************************************/
1267 /* Tunnel setsockopt() helper.
1269 static int pppol2tp_tunnel_setsockopt(struct sock *sk,
1270 struct l2tp_tunnel *tunnel,
1271 int optname, int val)
1276 case PPPOL2TP_SO_DEBUG:
1277 tunnel->debug = val;
1278 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: set debug=%x\n",
1279 tunnel->name, tunnel->debug);
1290 /* Session setsockopt helper.
1292 static int pppol2tp_session_setsockopt(struct sock *sk,
1293 struct l2tp_session *session,
1294 int optname, int val)
1299 case PPPOL2TP_SO_RECVSEQ:
1300 if ((val != 0) && (val != 1)) {
1304 session->recv_seq = !!val;
1305 l2tp_info(session, L2TP_MSG_CONTROL,
1306 "%s: set recv_seq=%d\n",
1307 session->name, session->recv_seq);
1310 case PPPOL2TP_SO_SENDSEQ:
1311 if ((val != 0) && (val != 1)) {
1315 session->send_seq = !!val;
1317 struct pppox_sock *po = pppox_sk(sk);
1319 po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
1320 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1322 l2tp_session_set_header_len(session, session->tunnel->version);
1323 l2tp_info(session, L2TP_MSG_CONTROL,
1324 "%s: set send_seq=%d\n",
1325 session->name, session->send_seq);
1328 case PPPOL2TP_SO_LNSMODE:
1329 if ((val != 0) && (val != 1)) {
1333 session->lns_mode = !!val;
1334 l2tp_info(session, L2TP_MSG_CONTROL,
1335 "%s: set lns_mode=%d\n",
1336 session->name, session->lns_mode);
1339 case PPPOL2TP_SO_DEBUG:
1340 session->debug = val;
1341 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set debug=%x\n",
1342 session->name, session->debug);
1345 case PPPOL2TP_SO_REORDERTO:
1346 session->reorder_timeout = msecs_to_jiffies(val);
1347 l2tp_info(session, L2TP_MSG_CONTROL,
1348 "%s: set reorder_timeout=%d\n",
1349 session->name, session->reorder_timeout);
1360 /* Main setsockopt() entry point.
1361 * Does API checks, then calls either the tunnel or session setsockopt
1362 * handler, according to whether the PPPoL2TP socket is a for a regular
1363 * session or the special tunnel type.
1365 static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
1366 char __user *optval, unsigned int optlen)
1368 struct sock *sk = sock->sk;
1369 struct l2tp_session *session;
1370 struct l2tp_tunnel *tunnel;
1374 if (level != SOL_PPPOL2TP)
1377 if (optlen < sizeof(int))
1380 if (get_user(val, (int __user *)optval))
1384 if (sk->sk_user_data == NULL)
1387 /* Get session context from the socket */
1389 session = pppol2tp_sock_to_session(sk);
1390 if (session == NULL)
1393 /* Special case: if session_id == 0x0000, treat as operation on tunnel
1395 if ((session->session_id == 0) &&
1396 (session->peer_session_id == 0)) {
1397 tunnel = session->tunnel;
1398 err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
1400 err = pppol2tp_session_setsockopt(sk, session, optname, val);
1408 /* Tunnel getsockopt helper. Called with sock locked.
1410 static int pppol2tp_tunnel_getsockopt(struct sock *sk,
1411 struct l2tp_tunnel *tunnel,
1412 int optname, int *val)
1417 case PPPOL2TP_SO_DEBUG:
1418 *val = tunnel->debug;
1419 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get debug=%x\n",
1420 tunnel->name, tunnel->debug);
1431 /* Session getsockopt helper. Called with sock locked.
1433 static int pppol2tp_session_getsockopt(struct sock *sk,
1434 struct l2tp_session *session,
1435 int optname, int *val)
1440 case PPPOL2TP_SO_RECVSEQ:
1441 *val = session->recv_seq;
1442 l2tp_info(session, L2TP_MSG_CONTROL,
1443 "%s: get recv_seq=%d\n", session->name, *val);
1446 case PPPOL2TP_SO_SENDSEQ:
1447 *val = session->send_seq;
1448 l2tp_info(session, L2TP_MSG_CONTROL,
1449 "%s: get send_seq=%d\n", session->name, *val);
1452 case PPPOL2TP_SO_LNSMODE:
1453 *val = session->lns_mode;
1454 l2tp_info(session, L2TP_MSG_CONTROL,
1455 "%s: get lns_mode=%d\n", session->name, *val);
1458 case PPPOL2TP_SO_DEBUG:
1459 *val = session->debug;
1460 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get debug=%d\n",
1461 session->name, *val);
1464 case PPPOL2TP_SO_REORDERTO:
1465 *val = (int) jiffies_to_msecs(session->reorder_timeout);
1466 l2tp_info(session, L2TP_MSG_CONTROL,
1467 "%s: get reorder_timeout=%d\n", session->name, *val);
1477 /* Main getsockopt() entry point.
1478 * Does API checks, then calls either the tunnel or session getsockopt
1479 * handler, according to whether the PPPoX socket is a for a regular session
1480 * or the special tunnel type.
1482 static int pppol2tp_getsockopt(struct socket *sock, int level, int optname,
1483 char __user *optval, int __user *optlen)
1485 struct sock *sk = sock->sk;
1486 struct l2tp_session *session;
1487 struct l2tp_tunnel *tunnel;
1491 if (level != SOL_PPPOL2TP)
1494 if (get_user(len, optlen))
1497 len = min_t(unsigned int, len, sizeof(int));
1503 if (sk->sk_user_data == NULL)
1506 /* Get the session context */
1508 session = pppol2tp_sock_to_session(sk);
1509 if (session == NULL)
1512 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1513 if ((session->session_id == 0) &&
1514 (session->peer_session_id == 0)) {
1515 tunnel = session->tunnel;
1516 err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
1520 err = pppol2tp_session_getsockopt(sk, session, optname, &val);
1526 if (put_user(len, optlen))
1529 if (copy_to_user((void __user *) optval, &val, len))
1540 /*****************************************************************************
1541 * /proc filesystem for debug
1542 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1543 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1544 *****************************************************************************/
1546 static unsigned int pppol2tp_net_id;
1548 #ifdef CONFIG_PROC_FS
1550 struct pppol2tp_seq_data {
1551 struct seq_net_private p;
1552 int tunnel_idx; /* current tunnel */
1553 int session_idx; /* index of session within current tunnel */
1554 struct l2tp_tunnel *tunnel;
1555 struct l2tp_session *session; /* NULL means get next tunnel */
1558 static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
1560 /* Drop reference taken during previous invocation */
1562 l2tp_tunnel_dec_refcount(pd->tunnel);
1565 pd->tunnel = l2tp_tunnel_get_nth(net, pd->tunnel_idx);
1568 /* Only accept L2TPv2 tunnels */
1569 if (!pd->tunnel || pd->tunnel->version == 2)
1572 l2tp_tunnel_dec_refcount(pd->tunnel);
1576 static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
1578 /* Drop reference taken during previous invocation */
1580 l2tp_session_dec_refcount(pd->session);
1582 pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx);
1585 if (pd->session == NULL) {
1586 pd->session_idx = 0;
1587 pppol2tp_next_tunnel(net, pd);
1591 static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
1593 struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
1600 BUG_ON(m->private == NULL);
1602 net = seq_file_net(m);
1604 if (pd->tunnel == NULL)
1605 pppol2tp_next_tunnel(net, pd);
1607 pppol2tp_next_session(net, pd);
1609 /* NULL tunnel and session indicates end of list */
1610 if ((pd->tunnel == NULL) && (pd->session == NULL))
1617 static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
1623 static void pppol2tp_seq_stop(struct seq_file *p, void *v)
1625 struct pppol2tp_seq_data *pd = v;
1627 if (!pd || pd == SEQ_START_TOKEN)
1630 /* Drop reference taken by last invocation of pppol2tp_next_session()
1631 * or pppol2tp_next_tunnel().
1634 l2tp_session_dec_refcount(pd->session);
1638 l2tp_tunnel_dec_refcount(pd->tunnel);
1643 static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
1645 struct l2tp_tunnel *tunnel = v;
1647 seq_printf(m, "\nTUNNEL '%s', %c %d\n",
1649 (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
1650 refcount_read(&tunnel->ref_count) - 1);
1651 seq_printf(m, " %08x %ld/%ld/%ld %ld/%ld/%ld\n",
1653 atomic_long_read(&tunnel->stats.tx_packets),
1654 atomic_long_read(&tunnel->stats.tx_bytes),
1655 atomic_long_read(&tunnel->stats.tx_errors),
1656 atomic_long_read(&tunnel->stats.rx_packets),
1657 atomic_long_read(&tunnel->stats.rx_bytes),
1658 atomic_long_read(&tunnel->stats.rx_errors));
1661 static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
1663 struct l2tp_session *session = v;
1664 struct l2tp_tunnel *tunnel = session->tunnel;
1665 unsigned char state;
1672 struct inet_sock *inet = inet_sk(tunnel->sock);
1673 ip = ntohl(inet->inet_saddr);
1674 port = ntohs(inet->inet_sport);
1677 sk = pppol2tp_session_get_sock(session);
1679 state = sk->sk_state;
1680 user_data_ok = (session == sk->sk_user_data) ? 'Y' : 'N';
1686 seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
1687 "%04X/%04X %d %c\n",
1688 session->name, ip, port,
1690 session->session_id,
1691 tunnel->peer_tunnel_id,
1692 session->peer_session_id,
1693 state, user_data_ok);
1694 seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n",
1695 session->mtu, session->mru,
1696 session->recv_seq ? 'R' : '-',
1697 session->send_seq ? 'S' : '-',
1698 session->lns_mode ? "LNS" : "LAC",
1700 jiffies_to_msecs(session->reorder_timeout));
1701 seq_printf(m, " %hu/%hu %ld/%ld/%ld %ld/%ld/%ld\n",
1702 session->nr, session->ns,
1703 atomic_long_read(&session->stats.tx_packets),
1704 atomic_long_read(&session->stats.tx_bytes),
1705 atomic_long_read(&session->stats.tx_errors),
1706 atomic_long_read(&session->stats.rx_packets),
1707 atomic_long_read(&session->stats.rx_bytes),
1708 atomic_long_read(&session->stats.rx_errors));
1711 struct pppox_sock *po = pppox_sk(sk);
1713 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
1718 static int pppol2tp_seq_show(struct seq_file *m, void *v)
1720 struct pppol2tp_seq_data *pd = v;
1722 /* display header on line 1 */
1723 if (v == SEQ_START_TOKEN) {
1724 seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
1725 seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
1726 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1727 seq_puts(m, " SESSION name, addr/port src-tid/sid "
1728 "dest-tid/sid state user-data-ok\n");
1729 seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1730 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1735 pppol2tp_seq_tunnel_show(m, pd->tunnel);
1737 pppol2tp_seq_session_show(m, pd->session);
1743 static const struct seq_operations pppol2tp_seq_ops = {
1744 .start = pppol2tp_seq_start,
1745 .next = pppol2tp_seq_next,
1746 .stop = pppol2tp_seq_stop,
1747 .show = pppol2tp_seq_show,
1749 #endif /* CONFIG_PROC_FS */
1751 /*****************************************************************************
1753 *****************************************************************************/
1755 static __net_init int pppol2tp_init_net(struct net *net)
1757 struct proc_dir_entry *pde;
1760 pde = proc_create_net("pppol2tp", 0444, net->proc_net,
1761 &pppol2tp_seq_ops, sizeof(struct pppol2tp_seq_data));
1771 static __net_exit void pppol2tp_exit_net(struct net *net)
1773 remove_proc_entry("pppol2tp", net->proc_net);
1776 static struct pernet_operations pppol2tp_net_ops = {
1777 .init = pppol2tp_init_net,
1778 .exit = pppol2tp_exit_net,
1779 .id = &pppol2tp_net_id,
1782 /*****************************************************************************
1784 *****************************************************************************/
1786 static const struct proto_ops pppol2tp_ops = {
1788 .owner = THIS_MODULE,
1789 .release = pppol2tp_release,
1790 .bind = sock_no_bind,
1791 .connect = pppol2tp_connect,
1792 .socketpair = sock_no_socketpair,
1793 .accept = sock_no_accept,
1794 .getname = pppol2tp_getname,
1795 .poll_mask = datagram_poll_mask,
1796 .listen = sock_no_listen,
1797 .shutdown = sock_no_shutdown,
1798 .setsockopt = pppol2tp_setsockopt,
1799 .getsockopt = pppol2tp_getsockopt,
1800 .sendmsg = pppol2tp_sendmsg,
1801 .recvmsg = pppol2tp_recvmsg,
1802 .mmap = sock_no_mmap,
1803 .ioctl = pppox_ioctl,
1806 static const struct pppox_proto pppol2tp_proto = {
1807 .create = pppol2tp_create,
1808 .ioctl = pppol2tp_ioctl,
1809 .owner = THIS_MODULE,
1812 #ifdef CONFIG_L2TP_V3
1814 static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = {
1815 .session_create = pppol2tp_session_create,
1816 .session_delete = l2tp_session_delete,
1819 #endif /* CONFIG_L2TP_V3 */
1821 static int __init pppol2tp_init(void)
1825 err = register_pernet_device(&pppol2tp_net_ops);
1829 err = proto_register(&pppol2tp_sk_proto, 0);
1831 goto out_unregister_pppol2tp_pernet;
1833 err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
1835 goto out_unregister_pppol2tp_proto;
1837 #ifdef CONFIG_L2TP_V3
1838 err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops);
1840 goto out_unregister_pppox;
1843 pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION);
1848 #ifdef CONFIG_L2TP_V3
1849 out_unregister_pppox:
1850 unregister_pppox_proto(PX_PROTO_OL2TP);
1852 out_unregister_pppol2tp_proto:
1853 proto_unregister(&pppol2tp_sk_proto);
1854 out_unregister_pppol2tp_pernet:
1855 unregister_pernet_device(&pppol2tp_net_ops);
1859 static void __exit pppol2tp_exit(void)
1861 #ifdef CONFIG_L2TP_V3
1862 l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP);
1864 unregister_pppox_proto(PX_PROTO_OL2TP);
1865 proto_unregister(&pppol2tp_sk_proto);
1866 unregister_pernet_device(&pppol2tp_net_ops);
1869 module_init(pppol2tp_init);
1870 module_exit(pppol2tp_exit);
1872 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1873 MODULE_DESCRIPTION("PPP over L2TP over UDP");
1874 MODULE_LICENSE("GPL");
1875 MODULE_VERSION(PPPOL2TP_DRV_VERSION);
1876 MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_OL2TP);
1877 MODULE_ALIAS_L2TP_PWTYPE(7);