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 sock *sock; /* Pointer to the session
127 struct sock *tunnel_sock; /* Pointer to the tunnel UDP
129 int flags; /* accessed by PPPIOCGFLAGS.
133 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb);
135 static const struct ppp_channel_ops pppol2tp_chan_ops = {
136 .start_xmit = pppol2tp_xmit,
139 static const struct proto_ops pppol2tp_ops;
141 /* Helpers to obtain tunnel/session contexts from sockets.
143 static inline struct l2tp_session *pppol2tp_sock_to_session(struct sock *sk)
145 struct l2tp_session *session;
151 session = (struct l2tp_session *)(sk->sk_user_data);
152 if (session == NULL) {
157 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
163 /*****************************************************************************
164 * Receive data handling
165 *****************************************************************************/
167 static int pppol2tp_recv_payload_hook(struct sk_buff *skb)
169 /* Skip PPP header, if present. In testing, Microsoft L2TP clients
170 * don't send the PPP header (PPP header compression enabled), but
171 * other clients can include the header. So we cope with both cases
172 * here. The PPP header is always FF03 when using L2TP.
174 * Note that skb->data[] isn't dereferenced from a u16 ptr here since
175 * the field may be unaligned.
177 if (!pskb_may_pull(skb, 2))
180 if ((skb->data[0] == PPP_ALLSTATIONS) && (skb->data[1] == PPP_UI))
186 /* Receive message. This is the recvmsg for the PPPoL2TP socket.
188 static int pppol2tp_recvmsg(struct socket *sock, struct msghdr *msg,
189 size_t len, int flags)
193 struct sock *sk = sock->sk;
196 if (sk->sk_state & PPPOX_BOUND)
200 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
201 flags & MSG_DONTWAIT, &err);
207 else if (len < skb->len)
208 msg->msg_flags |= MSG_TRUNC;
210 err = skb_copy_datagram_msg(skb, 0, msg, len);
211 if (likely(err == 0))
219 static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
221 struct pppol2tp_session *ps = l2tp_session_priv(session);
222 struct sock *sk = NULL;
224 /* If the socket is bound, send it in to PPP's input queue. Otherwise
225 * queue it on the session socket.
231 if (sk->sk_state & PPPOX_BOUND) {
232 struct pppox_sock *po;
234 l2tp_dbg(session, L2TP_MSG_DATA,
235 "%s: recv %d byte data frame, passing to ppp\n",
236 session->name, data_len);
239 ppp_input(&po->chan, skb);
241 l2tp_dbg(session, L2TP_MSG_DATA,
242 "%s: recv %d byte data frame, passing to L2TP socket\n",
243 session->name, data_len);
245 if (sock_queue_rcv_skb(sk, skb) < 0) {
246 atomic_long_inc(&session->stats.rx_errors);
254 l2tp_info(session, L2TP_MSG_DATA, "%s: no socket\n", session->name);
258 static void pppol2tp_session_sock_hold(struct l2tp_session *session)
260 struct pppol2tp_session *ps = l2tp_session_priv(session);
266 static void pppol2tp_session_sock_put(struct l2tp_session *session)
268 struct pppol2tp_session *ps = l2tp_session_priv(session);
274 /************************************************************************
276 ***********************************************************************/
278 /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here
279 * when a user application does a sendmsg() on the session socket. L2TP and
280 * PPP headers must be inserted into the user's data.
282 static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m,
285 struct sock *sk = sock->sk;
288 struct l2tp_session *session;
289 struct l2tp_tunnel *tunnel;
290 struct pppol2tp_session *ps;
294 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
297 /* Get session and tunnel contexts */
299 session = pppol2tp_sock_to_session(sk);
303 ps = l2tp_session_priv(session);
304 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
308 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
310 /* Allocate a socket buffer */
312 skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) +
313 uhlen + session->hdr_len +
314 2 + total_len, /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */
317 goto error_put_sess_tun;
319 /* Reserve space for headers. */
320 skb_reserve(skb, NET_SKB_PAD);
321 skb_reset_network_header(skb);
322 skb_reserve(skb, sizeof(struct iphdr));
323 skb_reset_transport_header(skb);
324 skb_reserve(skb, uhlen);
327 skb->data[0] = PPP_ALLSTATIONS;
328 skb->data[1] = PPP_UI;
331 /* Copy user data into skb */
332 error = memcpy_from_msg(skb_put(skb, total_len), m, total_len);
335 goto error_put_sess_tun;
339 l2tp_xmit_skb(session, skb, session->hdr_len);
342 sock_put(ps->tunnel_sock);
348 sock_put(ps->tunnel_sock);
355 /* Transmit function called by generic PPP driver. Sends PPP frame
356 * over PPPoL2TP socket.
358 * This is almost the same as pppol2tp_sendmsg(), but rather than
359 * being called with a msghdr from userspace, it is called with a skb
362 * The supplied skb from ppp doesn't have enough headroom for the
363 * insertion of L2TP, UDP and IP headers so we need to allocate more
364 * headroom in the skb. This will create a cloned skb. But we must be
365 * careful in the error case because the caller will expect to free
366 * the skb it supplied, not our cloned skb. So we take care to always
367 * leave the original skb unfreed if we return an error.
369 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
371 struct sock *sk = (struct sock *) chan->private;
373 struct l2tp_session *session;
374 struct l2tp_tunnel *tunnel;
375 struct pppol2tp_session *ps;
378 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
381 /* Get session and tunnel contexts from the socket */
382 session = pppol2tp_sock_to_session(sk);
386 ps = l2tp_session_priv(session);
387 sk_tun = ps->tunnel_sock;
390 tunnel = l2tp_sock_to_tunnel(sk_tun);
394 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
395 headroom = NET_SKB_PAD +
396 sizeof(struct iphdr) + /* IP header */
397 uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */
398 session->hdr_len + /* L2TP header */
399 2; /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */
400 if (skb_cow_head(skb, headroom))
401 goto abort_put_sess_tun;
403 /* Setup PPP header */
405 skb->data[0] = PPP_ALLSTATIONS;
406 skb->data[1] = PPP_UI;
409 l2tp_xmit_skb(session, skb, session->hdr_len);
421 /* Free the original skb */
426 /*****************************************************************************
427 * Session (and tunnel control) socket create/destroy.
428 *****************************************************************************/
430 /* Called by l2tp_core when a session socket is being closed.
432 static void pppol2tp_session_close(struct l2tp_session *session)
434 struct pppol2tp_session *ps = l2tp_session_priv(session);
435 struct sock *sk = ps->sock;
436 struct socket *sock = sk->sk_socket;
438 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
441 inet_shutdown(sock, SEND_SHUTDOWN);
442 /* Don't let the session go away before our socket does */
443 l2tp_session_inc_refcount(session);
447 /* Really kill the session socket. (Called from sock_put() if
450 static void pppol2tp_session_destruct(struct sock *sk)
452 struct l2tp_session *session = sk->sk_user_data;
454 skb_queue_purge(&sk->sk_receive_queue);
455 skb_queue_purge(&sk->sk_write_queue);
458 sk->sk_user_data = NULL;
459 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
460 l2tp_session_dec_refcount(session);
464 /* Called when the PPPoX socket (session) is closed.
466 static int pppol2tp_release(struct socket *sock)
468 struct sock *sk = sock->sk;
469 struct l2tp_session *session;
477 if (sock_flag(sk, SOCK_DEAD) != 0)
480 pppox_unbind_sock(sk);
482 /* Signal the death of the socket. */
483 sk->sk_state = PPPOX_DEAD;
487 session = pppol2tp_sock_to_session(sk);
489 /* Purge any queued data */
490 if (session != NULL) {
491 __l2tp_session_unhash(session);
492 l2tp_session_queue_purge(session);
497 /* This will delete the session context via
498 * pppol2tp_session_destruct() if the socket's refcnt drops to
510 static struct proto pppol2tp_sk_proto = {
512 .owner = THIS_MODULE,
513 .obj_size = sizeof(struct pppox_sock),
516 static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb)
520 rc = l2tp_udp_encap_recv(sk, skb);
524 return NET_RX_SUCCESS;
527 /* socket() handler. Initialize a new struct sock.
529 static int pppol2tp_create(struct net *net, struct socket *sock, int kern)
534 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto, kern);
538 sock_init_data(sock, sk);
540 sock->state = SS_UNCONNECTED;
541 sock->ops = &pppol2tp_ops;
543 sk->sk_backlog_rcv = pppol2tp_backlog_recv;
544 sk->sk_protocol = PX_PROTO_OL2TP;
545 sk->sk_family = PF_PPPOX;
546 sk->sk_state = PPPOX_NONE;
547 sk->sk_type = SOCK_STREAM;
548 sk->sk_destruct = pppol2tp_session_destruct;
556 #if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
557 static void pppol2tp_show(struct seq_file *m, void *arg)
559 struct l2tp_session *session = arg;
560 struct pppol2tp_session *ps = l2tp_session_priv(session);
563 struct pppox_sock *po = pppox_sk(ps->sock);
565 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
570 /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
572 static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
573 int sockaddr_len, int flags)
575 struct sock *sk = sock->sk;
576 struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr;
577 struct pppox_sock *po = pppox_sk(sk);
578 struct l2tp_session *session = NULL;
579 struct l2tp_tunnel *tunnel;
580 struct pppol2tp_session *ps;
581 struct dst_entry *dst;
582 struct l2tp_session_cfg cfg = { 0, };
584 u32 tunnel_id, peer_tunnel_id;
585 u32 session_id, peer_session_id;
586 bool drop_refcnt = false;
593 if (sp->sa_protocol != PX_PROTO_OL2TP)
596 /* Check for already bound sockets */
598 if (sk->sk_state & PPPOX_CONNECTED)
601 /* We don't supporting rebinding anyway */
603 if (sk->sk_user_data)
604 goto end; /* socket is already attached */
606 /* Get params from socket address. Handle L2TPv2 and L2TPv3.
607 * This is nasty because there are different sockaddr_pppol2tp
608 * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use
609 * the sockaddr size to determine which structure the caller
613 if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) {
614 fd = sp->pppol2tp.fd;
615 tunnel_id = sp->pppol2tp.s_tunnel;
616 peer_tunnel_id = sp->pppol2tp.d_tunnel;
617 session_id = sp->pppol2tp.s_session;
618 peer_session_id = sp->pppol2tp.d_session;
619 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) {
620 struct sockaddr_pppol2tpv3 *sp3 =
621 (struct sockaddr_pppol2tpv3 *) sp;
623 fd = sp3->pppol2tp.fd;
624 tunnel_id = sp3->pppol2tp.s_tunnel;
625 peer_tunnel_id = sp3->pppol2tp.d_tunnel;
626 session_id = sp3->pppol2tp.s_session;
627 peer_session_id = sp3->pppol2tp.d_session;
628 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpin6)) {
629 struct sockaddr_pppol2tpin6 *sp6 =
630 (struct sockaddr_pppol2tpin6 *) sp;
631 fd = sp6->pppol2tp.fd;
632 tunnel_id = sp6->pppol2tp.s_tunnel;
633 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
634 session_id = sp6->pppol2tp.s_session;
635 peer_session_id = sp6->pppol2tp.d_session;
636 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3in6)) {
637 struct sockaddr_pppol2tpv3in6 *sp6 =
638 (struct sockaddr_pppol2tpv3in6 *) sp;
640 fd = sp6->pppol2tp.fd;
641 tunnel_id = sp6->pppol2tp.s_tunnel;
642 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
643 session_id = sp6->pppol2tp.s_session;
644 peer_session_id = sp6->pppol2tp.d_session;
647 goto end; /* bad socket address */
650 /* Don't bind if tunnel_id is 0 */
655 tunnel = l2tp_tunnel_find(sock_net(sk), tunnel_id);
657 /* Special case: create tunnel context if session_id and
658 * peer_session_id is 0. Otherwise look up tunnel using supplied
661 if ((session_id == 0) && (peer_session_id == 0)) {
662 if (tunnel == NULL) {
663 struct l2tp_tunnel_cfg tcfg = {
664 .encap = L2TP_ENCAPTYPE_UDP,
667 error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel);
672 /* Error if we can't find the tunnel */
677 /* Error if socket is not prepped */
678 if (tunnel->sock == NULL)
682 if (tunnel->recv_payload_hook == NULL)
683 tunnel->recv_payload_hook = pppol2tp_recv_payload_hook;
685 if (tunnel->peer_tunnel_id == 0)
686 tunnel->peer_tunnel_id = peer_tunnel_id;
688 session = l2tp_session_get(sock_net(sk), tunnel, session_id, false);
691 ps = l2tp_session_priv(session);
693 /* Using a pre-existing session is fine as long as it hasn't
694 * been connected yet.
701 /* consistency checks */
702 if (ps->tunnel_sock != tunnel->sock) {
707 /* Default MTU must allow space for UDP/L2TP/PPP headers */
708 cfg.mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
711 session = l2tp_session_create(sizeof(struct pppol2tp_session),
713 peer_session_id, &cfg);
714 if (IS_ERR(session)) {
715 error = PTR_ERR(session);
720 /* Associate session with its PPPoL2TP socket */
721 ps = l2tp_session_priv(session);
722 ps->owner = current->pid;
724 ps->tunnel_sock = tunnel->sock;
726 session->recv_skb = pppol2tp_recv;
727 session->session_close = pppol2tp_session_close;
728 #if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
729 session->show = pppol2tp_show;
732 /* We need to know each time a skb is dropped from the reorder
735 session->ref = pppol2tp_session_sock_hold;
736 session->deref = pppol2tp_session_sock_put;
738 /* If PMTU discovery was enabled, use the MTU that was discovered */
739 dst = sk_dst_get(tunnel->sock);
741 u32 pmtu = dst_mtu(dst);
744 session->mtu = session->mru = pmtu -
745 PPPOL2TP_HEADER_OVERHEAD;
749 /* Special case: if source & dest session_id == 0x0000, this
750 * socket is being created to manage the tunnel. Just set up
751 * the internal context for use by ioctl() and sockopt()
754 if ((session->session_id == 0) &&
755 (session->peer_session_id == 0)) {
760 /* The only header we need to worry about is the L2TP
761 * header. This size is different depending on whether
762 * sequence numbers are enabled for the data channel.
764 po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
766 po->chan.private = sk;
767 po->chan.ops = &pppol2tp_chan_ops;
768 po->chan.mtu = session->mtu;
770 error = ppp_register_net_channel(sock_net(sk), &po->chan);
775 /* This is how we get the session context from the socket. */
776 sk->sk_user_data = session;
777 sk->sk_state = PPPOX_CONNECTED;
778 l2tp_info(session, L2TP_MSG_CONTROL, "%s: created\n",
783 l2tp_session_dec_refcount(session);
789 #ifdef CONFIG_L2TP_V3
791 /* Called when creating sessions via the netlink interface. */
792 static int pppol2tp_session_create(struct net *net, struct l2tp_tunnel *tunnel,
793 u32 session_id, u32 peer_session_id,
794 struct l2tp_session_cfg *cfg)
797 struct l2tp_session *session;
798 struct pppol2tp_session *ps;
800 /* Error if tunnel socket is not prepped */
806 /* Default MTU values. */
808 cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
812 /* Allocate and initialize a new session context. */
813 session = l2tp_session_create(sizeof(struct pppol2tp_session),
815 peer_session_id, cfg);
816 if (IS_ERR(session)) {
817 error = PTR_ERR(session);
821 ps = l2tp_session_priv(session);
822 ps->tunnel_sock = tunnel->sock;
824 l2tp_info(session, L2TP_MSG_CONTROL, "%s: created\n",
833 #endif /* CONFIG_L2TP_V3 */
835 /* getname() support.
837 static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
838 int *usockaddr_len, int peer)
842 struct l2tp_session *session;
843 struct l2tp_tunnel *tunnel;
844 struct sock *sk = sock->sk;
845 struct inet_sock *inet;
846 struct pppol2tp_session *pls;
851 if (!(sk->sk_state & PPPOX_CONNECTED))
855 session = pppol2tp_sock_to_session(sk);
859 pls = l2tp_session_priv(session);
860 tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock);
864 inet = inet_sk(tunnel->sock);
865 if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) {
866 struct sockaddr_pppol2tp sp;
869 sp.sa_family = AF_PPPOX;
870 sp.sa_protocol = PX_PROTO_OL2TP;
871 sp.pppol2tp.fd = tunnel->fd;
872 sp.pppol2tp.pid = pls->owner;
873 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
874 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
875 sp.pppol2tp.s_session = session->session_id;
876 sp.pppol2tp.d_session = session->peer_session_id;
877 sp.pppol2tp.addr.sin_family = AF_INET;
878 sp.pppol2tp.addr.sin_port = inet->inet_dport;
879 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
880 memcpy(uaddr, &sp, len);
881 #if IS_ENABLED(CONFIG_IPV6)
882 } else if ((tunnel->version == 2) &&
883 (tunnel->sock->sk_family == AF_INET6)) {
884 struct sockaddr_pppol2tpin6 sp;
888 sp.sa_family = AF_PPPOX;
889 sp.sa_protocol = PX_PROTO_OL2TP;
890 sp.pppol2tp.fd = tunnel->fd;
891 sp.pppol2tp.pid = pls->owner;
892 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
893 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
894 sp.pppol2tp.s_session = session->session_id;
895 sp.pppol2tp.d_session = session->peer_session_id;
896 sp.pppol2tp.addr.sin6_family = AF_INET6;
897 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
898 memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
899 sizeof(tunnel->sock->sk_v6_daddr));
900 memcpy(uaddr, &sp, len);
901 } else if ((tunnel->version == 3) &&
902 (tunnel->sock->sk_family == AF_INET6)) {
903 struct sockaddr_pppol2tpv3in6 sp;
907 sp.sa_family = AF_PPPOX;
908 sp.sa_protocol = PX_PROTO_OL2TP;
909 sp.pppol2tp.fd = tunnel->fd;
910 sp.pppol2tp.pid = pls->owner;
911 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
912 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
913 sp.pppol2tp.s_session = session->session_id;
914 sp.pppol2tp.d_session = session->peer_session_id;
915 sp.pppol2tp.addr.sin6_family = AF_INET6;
916 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
917 memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
918 sizeof(tunnel->sock->sk_v6_daddr));
919 memcpy(uaddr, &sp, len);
921 } else if (tunnel->version == 3) {
922 struct sockaddr_pppol2tpv3 sp;
925 sp.sa_family = AF_PPPOX;
926 sp.sa_protocol = PX_PROTO_OL2TP;
927 sp.pppol2tp.fd = tunnel->fd;
928 sp.pppol2tp.pid = pls->owner;
929 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
930 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
931 sp.pppol2tp.s_session = session->session_id;
932 sp.pppol2tp.d_session = session->peer_session_id;
933 sp.pppol2tp.addr.sin_family = AF_INET;
934 sp.pppol2tp.addr.sin_port = inet->inet_dport;
935 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
936 memcpy(uaddr, &sp, len);
939 *usockaddr_len = len;
942 sock_put(pls->tunnel_sock);
949 /****************************************************************************
952 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
953 * sockets. However, in order to control kernel tunnel features, we allow
954 * userspace to create a special "tunnel" PPPoX socket which is used for
955 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
956 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
958 ****************************************************************************/
960 static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest,
961 struct l2tp_stats *stats)
963 dest->tx_packets = atomic_long_read(&stats->tx_packets);
964 dest->tx_bytes = atomic_long_read(&stats->tx_bytes);
965 dest->tx_errors = atomic_long_read(&stats->tx_errors);
966 dest->rx_packets = atomic_long_read(&stats->rx_packets);
967 dest->rx_bytes = atomic_long_read(&stats->rx_bytes);
968 dest->rx_seq_discards = atomic_long_read(&stats->rx_seq_discards);
969 dest->rx_oos_packets = atomic_long_read(&stats->rx_oos_packets);
970 dest->rx_errors = atomic_long_read(&stats->rx_errors);
973 /* Session ioctl helper.
975 static int pppol2tp_session_ioctl(struct l2tp_session *session,
976 unsigned int cmd, unsigned long arg)
982 struct pppol2tp_session *ps = l2tp_session_priv(session);
983 struct l2tp_tunnel *tunnel = session->tunnel;
984 struct pppol2tp_ioc_stats stats;
986 l2tp_dbg(session, L2TP_MSG_CONTROL,
987 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
988 session->name, cmd, arg);
996 if (!(sk->sk_state & PPPOX_CONNECTED))
1000 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1002 ifr.ifr_mtu = session->mtu;
1003 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
1006 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mtu=%d\n",
1007 session->name, session->mtu);
1013 if (!(sk->sk_state & PPPOX_CONNECTED))
1017 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1020 session->mtu = ifr.ifr_mtu;
1022 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mtu=%d\n",
1023 session->name, session->mtu);
1029 if (!(sk->sk_state & PPPOX_CONNECTED))
1033 if (put_user(session->mru, (int __user *) arg))
1036 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mru=%d\n",
1037 session->name, session->mru);
1043 if (!(sk->sk_state & PPPOX_CONNECTED))
1047 if (get_user(val, (int __user *) arg))
1051 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mru=%d\n",
1052 session->name, session->mru);
1058 if (put_user(ps->flags, (int __user *) arg))
1061 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get flags=%d\n",
1062 session->name, ps->flags);
1068 if (get_user(val, (int __user *) arg))
1071 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set flags=%d\n",
1072 session->name, ps->flags);
1076 case PPPIOCGL2TPSTATS:
1078 if (!(sk->sk_state & PPPOX_CONNECTED))
1081 memset(&stats, 0, sizeof(stats));
1082 stats.tunnel_id = tunnel->tunnel_id;
1083 stats.session_id = session->session_id;
1084 pppol2tp_copy_stats(&stats, &session->stats);
1085 if (copy_to_user((void __user *) arg, &stats,
1088 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1103 /* Tunnel ioctl helper.
1105 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1106 * specifies a session_id, the session ioctl handler is called. This allows an
1107 * application to retrieve session stats via a tunnel socket.
1109 static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
1110 unsigned int cmd, unsigned long arg)
1114 struct pppol2tp_ioc_stats stats;
1116 l2tp_dbg(tunnel, L2TP_MSG_CONTROL,
1117 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1118 tunnel->name, cmd, arg);
1124 case PPPIOCGL2TPSTATS:
1126 if (!(sk->sk_state & PPPOX_CONNECTED))
1129 if (copy_from_user(&stats, (void __user *) arg,
1134 if (stats.session_id != 0) {
1135 /* resend to session ioctl handler */
1136 struct l2tp_session *session =
1137 l2tp_session_get(sock_net(sk), tunnel,
1138 stats.session_id, true);
1141 err = pppol2tp_session_ioctl(session, cmd,
1144 session->deref(session);
1145 l2tp_session_dec_refcount(session);
1152 stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
1154 pppol2tp_copy_stats(&stats, &tunnel->stats);
1155 if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) {
1159 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1174 /* Main ioctl() handler.
1175 * Dispatch to tunnel or session helpers depending on the socket.
1177 static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
1180 struct sock *sk = sock->sk;
1181 struct l2tp_session *session;
1182 struct l2tp_tunnel *tunnel;
1183 struct pppol2tp_session *ps;
1190 if (sock_flag(sk, SOCK_DEAD) != 0)
1194 if ((sk->sk_user_data == NULL) ||
1195 (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
1198 /* Get session context from the socket */
1200 session = pppol2tp_sock_to_session(sk);
1201 if (session == NULL)
1204 /* Special case: if session's session_id is zero, treat ioctl as a
1207 ps = l2tp_session_priv(session);
1208 if ((session->session_id == 0) &&
1209 (session->peer_session_id == 0)) {
1211 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1215 err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
1216 sock_put(ps->tunnel_sock);
1220 err = pppol2tp_session_ioctl(session, cmd, arg);
1228 /*****************************************************************************
1229 * setsockopt() / getsockopt() support.
1231 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1232 * sockets. In order to control kernel tunnel features, we allow userspace to
1233 * create a special "tunnel" PPPoX socket which is used for control only.
1234 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1235 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1236 *****************************************************************************/
1238 /* Tunnel setsockopt() helper.
1240 static int pppol2tp_tunnel_setsockopt(struct sock *sk,
1241 struct l2tp_tunnel *tunnel,
1242 int optname, int val)
1247 case PPPOL2TP_SO_DEBUG:
1248 tunnel->debug = val;
1249 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: set debug=%x\n",
1250 tunnel->name, tunnel->debug);
1261 /* Session setsockopt helper.
1263 static int pppol2tp_session_setsockopt(struct sock *sk,
1264 struct l2tp_session *session,
1265 int optname, int val)
1268 struct pppol2tp_session *ps = l2tp_session_priv(session);
1271 case PPPOL2TP_SO_RECVSEQ:
1272 if ((val != 0) && (val != 1)) {
1276 session->recv_seq = !!val;
1277 l2tp_info(session, L2TP_MSG_CONTROL,
1278 "%s: set recv_seq=%d\n",
1279 session->name, session->recv_seq);
1282 case PPPOL2TP_SO_SENDSEQ:
1283 if ((val != 0) && (val != 1)) {
1287 session->send_seq = !!val;
1289 struct sock *ssk = ps->sock;
1290 struct pppox_sock *po = pppox_sk(ssk);
1291 po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
1292 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1294 l2tp_session_set_header_len(session, session->tunnel->version);
1295 l2tp_info(session, L2TP_MSG_CONTROL,
1296 "%s: set send_seq=%d\n",
1297 session->name, session->send_seq);
1300 case PPPOL2TP_SO_LNSMODE:
1301 if ((val != 0) && (val != 1)) {
1305 session->lns_mode = !!val;
1306 l2tp_info(session, L2TP_MSG_CONTROL,
1307 "%s: set lns_mode=%d\n",
1308 session->name, session->lns_mode);
1311 case PPPOL2TP_SO_DEBUG:
1312 session->debug = val;
1313 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set debug=%x\n",
1314 session->name, session->debug);
1317 case PPPOL2TP_SO_REORDERTO:
1318 session->reorder_timeout = msecs_to_jiffies(val);
1319 l2tp_info(session, L2TP_MSG_CONTROL,
1320 "%s: set reorder_timeout=%d\n",
1321 session->name, session->reorder_timeout);
1332 /* Main setsockopt() entry point.
1333 * Does API checks, then calls either the tunnel or session setsockopt
1334 * handler, according to whether the PPPoL2TP socket is a for a regular
1335 * session or the special tunnel type.
1337 static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
1338 char __user *optval, unsigned int optlen)
1340 struct sock *sk = sock->sk;
1341 struct l2tp_session *session;
1342 struct l2tp_tunnel *tunnel;
1343 struct pppol2tp_session *ps;
1347 if (level != SOL_PPPOL2TP)
1350 if (optlen < sizeof(int))
1353 if (get_user(val, (int __user *)optval))
1357 if (sk->sk_user_data == NULL)
1360 /* Get session context from the socket */
1362 session = pppol2tp_sock_to_session(sk);
1363 if (session == NULL)
1366 /* Special case: if session_id == 0x0000, treat as operation on tunnel
1368 ps = l2tp_session_priv(session);
1369 if ((session->session_id == 0) &&
1370 (session->peer_session_id == 0)) {
1372 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1376 err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
1377 sock_put(ps->tunnel_sock);
1379 err = pppol2tp_session_setsockopt(sk, session, optname, val);
1387 /* Tunnel getsockopt helper. Called with sock locked.
1389 static int pppol2tp_tunnel_getsockopt(struct sock *sk,
1390 struct l2tp_tunnel *tunnel,
1391 int optname, int *val)
1396 case PPPOL2TP_SO_DEBUG:
1397 *val = tunnel->debug;
1398 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get debug=%x\n",
1399 tunnel->name, tunnel->debug);
1410 /* Session getsockopt helper. Called with sock locked.
1412 static int pppol2tp_session_getsockopt(struct sock *sk,
1413 struct l2tp_session *session,
1414 int optname, int *val)
1419 case PPPOL2TP_SO_RECVSEQ:
1420 *val = session->recv_seq;
1421 l2tp_info(session, L2TP_MSG_CONTROL,
1422 "%s: get recv_seq=%d\n", session->name, *val);
1425 case PPPOL2TP_SO_SENDSEQ:
1426 *val = session->send_seq;
1427 l2tp_info(session, L2TP_MSG_CONTROL,
1428 "%s: get send_seq=%d\n", session->name, *val);
1431 case PPPOL2TP_SO_LNSMODE:
1432 *val = session->lns_mode;
1433 l2tp_info(session, L2TP_MSG_CONTROL,
1434 "%s: get lns_mode=%d\n", session->name, *val);
1437 case PPPOL2TP_SO_DEBUG:
1438 *val = session->debug;
1439 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get debug=%d\n",
1440 session->name, *val);
1443 case PPPOL2TP_SO_REORDERTO:
1444 *val = (int) jiffies_to_msecs(session->reorder_timeout);
1445 l2tp_info(session, L2TP_MSG_CONTROL,
1446 "%s: get reorder_timeout=%d\n", session->name, *val);
1456 /* Main getsockopt() entry point.
1457 * Does API checks, then calls either the tunnel or session getsockopt
1458 * handler, according to whether the PPPoX socket is a for a regular session
1459 * or the special tunnel type.
1461 static int pppol2tp_getsockopt(struct socket *sock, int level, int optname,
1462 char __user *optval, int __user *optlen)
1464 struct sock *sk = sock->sk;
1465 struct l2tp_session *session;
1466 struct l2tp_tunnel *tunnel;
1469 struct pppol2tp_session *ps;
1471 if (level != SOL_PPPOL2TP)
1474 if (get_user(len, optlen))
1477 len = min_t(unsigned int, len, sizeof(int));
1483 if (sk->sk_user_data == NULL)
1486 /* Get the session context */
1488 session = pppol2tp_sock_to_session(sk);
1489 if (session == NULL)
1492 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1493 ps = l2tp_session_priv(session);
1494 if ((session->session_id == 0) &&
1495 (session->peer_session_id == 0)) {
1497 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1501 err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
1502 sock_put(ps->tunnel_sock);
1506 err = pppol2tp_session_getsockopt(sk, session, optname, &val);
1512 if (put_user(len, optlen))
1515 if (copy_to_user((void __user *) optval, &val, len))
1526 /*****************************************************************************
1527 * /proc filesystem for debug
1528 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1529 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1530 *****************************************************************************/
1532 static unsigned int pppol2tp_net_id;
1534 #ifdef CONFIG_PROC_FS
1536 struct pppol2tp_seq_data {
1537 struct seq_net_private p;
1538 int tunnel_idx; /* current tunnel */
1539 int session_idx; /* index of session within current tunnel */
1540 struct l2tp_tunnel *tunnel;
1541 struct l2tp_session *session; /* NULL means get next tunnel */
1544 static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
1547 pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx);
1550 if (pd->tunnel == NULL)
1553 /* Ignore L2TPv3 tunnels */
1554 if (pd->tunnel->version < 3)
1559 static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
1561 pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx, true);
1564 if (pd->session == NULL) {
1565 pd->session_idx = 0;
1566 pppol2tp_next_tunnel(net, pd);
1570 static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
1572 struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
1579 BUG_ON(m->private == NULL);
1581 net = seq_file_net(m);
1583 if (pd->tunnel == NULL)
1584 pppol2tp_next_tunnel(net, pd);
1586 pppol2tp_next_session(net, pd);
1588 /* NULL tunnel and session indicates end of list */
1589 if ((pd->tunnel == NULL) && (pd->session == NULL))
1596 static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
1602 static void pppol2tp_seq_stop(struct seq_file *p, void *v)
1607 static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
1609 struct l2tp_tunnel *tunnel = v;
1611 seq_printf(m, "\nTUNNEL '%s', %c %d\n",
1613 (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
1614 refcount_read(&tunnel->ref_count) - 1);
1615 seq_printf(m, " %08x %ld/%ld/%ld %ld/%ld/%ld\n",
1617 atomic_long_read(&tunnel->stats.tx_packets),
1618 atomic_long_read(&tunnel->stats.tx_bytes),
1619 atomic_long_read(&tunnel->stats.tx_errors),
1620 atomic_long_read(&tunnel->stats.rx_packets),
1621 atomic_long_read(&tunnel->stats.rx_bytes),
1622 atomic_long_read(&tunnel->stats.rx_errors));
1625 static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
1627 struct l2tp_session *session = v;
1628 struct l2tp_tunnel *tunnel = session->tunnel;
1629 struct pppol2tp_session *ps = l2tp_session_priv(session);
1630 struct pppox_sock *po = pppox_sk(ps->sock);
1635 struct inet_sock *inet = inet_sk(tunnel->sock);
1636 ip = ntohl(inet->inet_saddr);
1637 port = ntohs(inet->inet_sport);
1640 seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
1641 "%04X/%04X %d %c\n",
1642 session->name, ip, port,
1644 session->session_id,
1645 tunnel->peer_tunnel_id,
1646 session->peer_session_id,
1648 (session == ps->sock->sk_user_data) ?
1650 seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n",
1651 session->mtu, session->mru,
1652 session->recv_seq ? 'R' : '-',
1653 session->send_seq ? 'S' : '-',
1654 session->lns_mode ? "LNS" : "LAC",
1656 jiffies_to_msecs(session->reorder_timeout));
1657 seq_printf(m, " %hu/%hu %ld/%ld/%ld %ld/%ld/%ld\n",
1658 session->nr, session->ns,
1659 atomic_long_read(&session->stats.tx_packets),
1660 atomic_long_read(&session->stats.tx_bytes),
1661 atomic_long_read(&session->stats.tx_errors),
1662 atomic_long_read(&session->stats.rx_packets),
1663 atomic_long_read(&session->stats.rx_bytes),
1664 atomic_long_read(&session->stats.rx_errors));
1667 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
1670 static int pppol2tp_seq_show(struct seq_file *m, void *v)
1672 struct pppol2tp_seq_data *pd = v;
1674 /* display header on line 1 */
1675 if (v == SEQ_START_TOKEN) {
1676 seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
1677 seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
1678 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1679 seq_puts(m, " SESSION name, addr/port src-tid/sid "
1680 "dest-tid/sid state user-data-ok\n");
1681 seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1682 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1686 /* Show the tunnel or session context.
1689 pppol2tp_seq_tunnel_show(m, pd->tunnel);
1691 pppol2tp_seq_session_show(m, pd->session);
1692 if (pd->session->deref)
1693 pd->session->deref(pd->session);
1694 l2tp_session_dec_refcount(pd->session);
1701 static const struct seq_operations pppol2tp_seq_ops = {
1702 .start = pppol2tp_seq_start,
1703 .next = pppol2tp_seq_next,
1704 .stop = pppol2tp_seq_stop,
1705 .show = pppol2tp_seq_show,
1708 /* Called when our /proc file is opened. We allocate data for use when
1709 * iterating our tunnel / session contexts and store it in the private
1710 * data of the seq_file.
1712 static int pppol2tp_proc_open(struct inode *inode, struct file *file)
1714 return seq_open_net(inode, file, &pppol2tp_seq_ops,
1715 sizeof(struct pppol2tp_seq_data));
1718 static const struct file_operations pppol2tp_proc_fops = {
1719 .owner = THIS_MODULE,
1720 .open = pppol2tp_proc_open,
1722 .llseek = seq_lseek,
1723 .release = seq_release_net,
1726 #endif /* CONFIG_PROC_FS */
1728 /*****************************************************************************
1730 *****************************************************************************/
1732 static __net_init int pppol2tp_init_net(struct net *net)
1734 struct proc_dir_entry *pde;
1737 pde = proc_create("pppol2tp", S_IRUGO, net->proc_net,
1738 &pppol2tp_proc_fops);
1748 static __net_exit void pppol2tp_exit_net(struct net *net)
1750 remove_proc_entry("pppol2tp", net->proc_net);
1753 static struct pernet_operations pppol2tp_net_ops = {
1754 .init = pppol2tp_init_net,
1755 .exit = pppol2tp_exit_net,
1756 .id = &pppol2tp_net_id,
1759 /*****************************************************************************
1761 *****************************************************************************/
1763 static const struct proto_ops pppol2tp_ops = {
1765 .owner = THIS_MODULE,
1766 .release = pppol2tp_release,
1767 .bind = sock_no_bind,
1768 .connect = pppol2tp_connect,
1769 .socketpair = sock_no_socketpair,
1770 .accept = sock_no_accept,
1771 .getname = pppol2tp_getname,
1772 .poll = datagram_poll,
1773 .listen = sock_no_listen,
1774 .shutdown = sock_no_shutdown,
1775 .setsockopt = pppol2tp_setsockopt,
1776 .getsockopt = pppol2tp_getsockopt,
1777 .sendmsg = pppol2tp_sendmsg,
1778 .recvmsg = pppol2tp_recvmsg,
1779 .mmap = sock_no_mmap,
1780 .ioctl = pppox_ioctl,
1783 static const struct pppox_proto pppol2tp_proto = {
1784 .create = pppol2tp_create,
1785 .ioctl = pppol2tp_ioctl,
1786 .owner = THIS_MODULE,
1789 #ifdef CONFIG_L2TP_V3
1791 static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = {
1792 .session_create = pppol2tp_session_create,
1793 .session_delete = l2tp_session_delete,
1796 #endif /* CONFIG_L2TP_V3 */
1798 static int __init pppol2tp_init(void)
1802 err = register_pernet_device(&pppol2tp_net_ops);
1806 err = proto_register(&pppol2tp_sk_proto, 0);
1808 goto out_unregister_pppol2tp_pernet;
1810 err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
1812 goto out_unregister_pppol2tp_proto;
1814 #ifdef CONFIG_L2TP_V3
1815 err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops);
1817 goto out_unregister_pppox;
1820 pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION);
1825 #ifdef CONFIG_L2TP_V3
1826 out_unregister_pppox:
1827 unregister_pppox_proto(PX_PROTO_OL2TP);
1829 out_unregister_pppol2tp_proto:
1830 proto_unregister(&pppol2tp_sk_proto);
1831 out_unregister_pppol2tp_pernet:
1832 unregister_pernet_device(&pppol2tp_net_ops);
1836 static void __exit pppol2tp_exit(void)
1838 #ifdef CONFIG_L2TP_V3
1839 l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP);
1841 unregister_pppox_proto(PX_PROTO_OL2TP);
1842 proto_unregister(&pppol2tp_sk_proto);
1843 unregister_pernet_device(&pppol2tp_net_ops);
1846 module_init(pppol2tp_init);
1847 module_exit(pppol2tp_exit);
1849 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1850 MODULE_DESCRIPTION("PPP over L2TP over UDP");
1851 MODULE_LICENSE("GPL");
1852 MODULE_VERSION(PPPOL2TP_DRV_VERSION);
1853 MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_OL2TP);
1854 MODULE_ALIAS_L2TP_PWTYPE(7);