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] == 0xff) && (skb->data[1] == 0x03))
186 /* Receive message. This is the recvmsg for the PPPoL2TP socket.
188 static int pppol2tp_recvmsg(struct kiocb *iocb, struct socket *sock,
189 struct msghdr *msg, size_t len,
194 struct sock *sk = sock->sk;
197 if (sk->sk_state & PPPOX_BOUND)
200 msg->msg_namelen = 0;
203 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
204 flags & MSG_DONTWAIT, &err);
210 else if (len < skb->len)
211 msg->msg_flags |= MSG_TRUNC;
213 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len);
214 if (likely(err == 0))
222 static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
224 struct pppol2tp_session *ps = l2tp_session_priv(session);
225 struct sock *sk = NULL;
227 /* If the socket is bound, send it in to PPP's input queue. Otherwise
228 * queue it on the session socket.
234 if (sk->sk_state & PPPOX_BOUND) {
235 struct pppox_sock *po;
236 l2tp_dbg(session, PPPOL2TP_MSG_DATA,
237 "%s: recv %d byte data frame, passing to ppp\n",
238 session->name, data_len);
240 /* We need to forget all info related to the L2TP packet
241 * gathered in the skb as we are going to reuse the same
242 * skb for the inner packet.
244 * - reset xfrm (IPSec) information as it applies to
245 * the outer L2TP packet and not to the inner one
246 * - release the dst to force a route lookup on the inner
247 * IP packet since skb->dst currently points to the dst
249 * - reset netfilter information as it doesn't apply
250 * to the inner packet either
257 ppp_input(&po->chan, skb);
259 l2tp_info(session, PPPOL2TP_MSG_DATA, "%s: socket not bound\n",
262 /* Not bound. Nothing we can do, so discard. */
263 atomic_long_inc(&session->stats.rx_errors);
270 l2tp_info(session, PPPOL2TP_MSG_DATA, "%s: no socket\n", session->name);
274 static void pppol2tp_session_sock_hold(struct l2tp_session *session)
276 struct pppol2tp_session *ps = l2tp_session_priv(session);
282 static void pppol2tp_session_sock_put(struct l2tp_session *session)
284 struct pppol2tp_session *ps = l2tp_session_priv(session);
290 /************************************************************************
292 ***********************************************************************/
294 /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here
295 * when a user application does a sendmsg() on the session socket. L2TP and
296 * PPP headers must be inserted into the user's data.
298 static int pppol2tp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
301 static const unsigned char ppph[2] = { 0xff, 0x03 };
302 struct sock *sk = sock->sk;
305 struct l2tp_session *session;
306 struct l2tp_tunnel *tunnel;
307 struct pppol2tp_session *ps;
311 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
314 /* Get session and tunnel contexts */
316 session = pppol2tp_sock_to_session(sk);
320 ps = l2tp_session_priv(session);
321 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
325 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
327 /* Allocate a socket buffer */
329 skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) +
330 uhlen + session->hdr_len +
331 sizeof(ppph) + total_len,
334 goto error_put_sess_tun;
336 /* Reserve space for headers. */
337 skb_reserve(skb, NET_SKB_PAD);
338 skb_reset_network_header(skb);
339 skb_reserve(skb, sizeof(struct iphdr));
340 skb_reset_transport_header(skb);
341 skb_reserve(skb, uhlen);
344 skb->data[0] = ppph[0];
345 skb->data[1] = ppph[1];
348 /* Copy user data into skb */
349 error = memcpy_fromiovec(skb->data, m->msg_iov, total_len);
352 goto error_put_sess_tun;
354 skb_put(skb, total_len);
356 l2tp_xmit_skb(session, skb, session->hdr_len);
358 sock_put(ps->tunnel_sock);
364 sock_put(ps->tunnel_sock);
371 /* Transmit function called by generic PPP driver. Sends PPP frame
372 * over PPPoL2TP socket.
374 * This is almost the same as pppol2tp_sendmsg(), but rather than
375 * being called with a msghdr from userspace, it is called with a skb
378 * The supplied skb from ppp doesn't have enough headroom for the
379 * insertion of L2TP, UDP and IP headers so we need to allocate more
380 * headroom in the skb. This will create a cloned skb. But we must be
381 * careful in the error case because the caller will expect to free
382 * the skb it supplied, not our cloned skb. So we take care to always
383 * leave the original skb unfreed if we return an error.
385 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
387 static const u8 ppph[2] = { 0xff, 0x03 };
388 struct sock *sk = (struct sock *) chan->private;
390 struct l2tp_session *session;
391 struct l2tp_tunnel *tunnel;
392 struct pppol2tp_session *ps;
395 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
398 /* Get session and tunnel contexts from the socket */
399 session = pppol2tp_sock_to_session(sk);
403 ps = l2tp_session_priv(session);
404 sk_tun = ps->tunnel_sock;
407 tunnel = l2tp_sock_to_tunnel(sk_tun);
411 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
412 headroom = NET_SKB_PAD +
413 sizeof(struct iphdr) + /* IP header */
414 uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */
415 session->hdr_len + /* L2TP header */
416 sizeof(ppph); /* PPP header */
417 if (skb_cow_head(skb, headroom))
418 goto abort_put_sess_tun;
420 /* Setup PPP header */
421 __skb_push(skb, sizeof(ppph));
422 skb->data[0] = ppph[0];
423 skb->data[1] = ppph[1];
425 l2tp_xmit_skb(session, skb, session->hdr_len);
436 /* Free the original skb */
441 /*****************************************************************************
442 * Session (and tunnel control) socket create/destroy.
443 *****************************************************************************/
445 /* Called by l2tp_core when a session socket is being closed.
447 static void pppol2tp_session_close(struct l2tp_session *session)
449 struct pppol2tp_session *ps = l2tp_session_priv(session);
450 struct sock *sk = ps->sock;
451 struct socket *sock = sk->sk_socket;
453 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
457 inet_shutdown(sock, 2);
458 /* Don't let the session go away before our socket does */
459 l2tp_session_inc_refcount(session);
464 /* Really kill the session socket. (Called from sock_put() if
467 static void pppol2tp_session_destruct(struct sock *sk)
469 struct l2tp_session *session = sk->sk_user_data;
471 sk->sk_user_data = NULL;
472 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
473 l2tp_session_dec_refcount(session);
478 /* Called when the PPPoX socket (session) is closed.
480 static int pppol2tp_release(struct socket *sock)
482 struct sock *sk = sock->sk;
483 struct l2tp_session *session;
491 if (sock_flag(sk, SOCK_DEAD) != 0)
494 pppox_unbind_sock(sk);
496 /* Signal the death of the socket. */
497 sk->sk_state = PPPOX_DEAD;
501 session = pppol2tp_sock_to_session(sk);
503 /* Purge any queued data */
504 if (session != NULL) {
505 __l2tp_session_unhash(session);
506 l2tp_session_queue_purge(session);
509 skb_queue_purge(&sk->sk_receive_queue);
510 skb_queue_purge(&sk->sk_write_queue);
514 /* This will delete the session context via
515 * pppol2tp_session_destruct() if the socket's refcnt drops to
527 static struct proto pppol2tp_sk_proto = {
529 .owner = THIS_MODULE,
530 .obj_size = sizeof(struct pppox_sock),
533 static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb)
537 rc = l2tp_udp_encap_recv(sk, skb);
541 return NET_RX_SUCCESS;
544 /* socket() handler. Initialize a new struct sock.
546 static int pppol2tp_create(struct net *net, struct socket *sock)
551 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto);
555 sock_init_data(sock, sk);
557 sock->state = SS_UNCONNECTED;
558 sock->ops = &pppol2tp_ops;
560 sk->sk_backlog_rcv = pppol2tp_backlog_recv;
561 sk->sk_protocol = PX_PROTO_OL2TP;
562 sk->sk_family = PF_PPPOX;
563 sk->sk_state = PPPOX_NONE;
564 sk->sk_type = SOCK_STREAM;
565 sk->sk_destruct = pppol2tp_session_destruct;
573 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
574 static void pppol2tp_show(struct seq_file *m, void *arg)
576 struct l2tp_session *session = arg;
577 struct pppol2tp_session *ps = l2tp_session_priv(session);
580 struct pppox_sock *po = pppox_sk(ps->sock);
582 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
587 /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
589 static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
590 int sockaddr_len, int flags)
592 struct sock *sk = sock->sk;
593 struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr;
594 struct pppox_sock *po = pppox_sk(sk);
595 struct l2tp_session *session = NULL;
596 struct l2tp_tunnel *tunnel;
597 struct pppol2tp_session *ps;
598 struct dst_entry *dst;
599 struct l2tp_session_cfg cfg = { 0, };
601 u32 tunnel_id, peer_tunnel_id;
602 u32 session_id, peer_session_id;
609 if (sp->sa_protocol != PX_PROTO_OL2TP)
612 /* Check for already bound sockets */
614 if (sk->sk_state & PPPOX_CONNECTED)
617 /* We don't supporting rebinding anyway */
619 if (sk->sk_user_data)
620 goto end; /* socket is already attached */
622 /* Get params from socket address. Handle L2TPv2 and L2TPv3.
623 * This is nasty because there are different sockaddr_pppol2tp
624 * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use
625 * the sockaddr size to determine which structure the caller
629 if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) {
630 fd = sp->pppol2tp.fd;
631 tunnel_id = sp->pppol2tp.s_tunnel;
632 peer_tunnel_id = sp->pppol2tp.d_tunnel;
633 session_id = sp->pppol2tp.s_session;
634 peer_session_id = sp->pppol2tp.d_session;
635 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) {
636 struct sockaddr_pppol2tpv3 *sp3 =
637 (struct sockaddr_pppol2tpv3 *) sp;
639 fd = sp3->pppol2tp.fd;
640 tunnel_id = sp3->pppol2tp.s_tunnel;
641 peer_tunnel_id = sp3->pppol2tp.d_tunnel;
642 session_id = sp3->pppol2tp.s_session;
643 peer_session_id = sp3->pppol2tp.d_session;
644 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpin6)) {
645 struct sockaddr_pppol2tpin6 *sp6 =
646 (struct sockaddr_pppol2tpin6 *) sp;
647 fd = sp6->pppol2tp.fd;
648 tunnel_id = sp6->pppol2tp.s_tunnel;
649 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
650 session_id = sp6->pppol2tp.s_session;
651 peer_session_id = sp6->pppol2tp.d_session;
652 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3in6)) {
653 struct sockaddr_pppol2tpv3in6 *sp6 =
654 (struct sockaddr_pppol2tpv3in6 *) sp;
656 fd = sp6->pppol2tp.fd;
657 tunnel_id = sp6->pppol2tp.s_tunnel;
658 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
659 session_id = sp6->pppol2tp.s_session;
660 peer_session_id = sp6->pppol2tp.d_session;
663 goto end; /* bad socket address */
666 /* Don't bind if tunnel_id is 0 */
671 tunnel = l2tp_tunnel_find(sock_net(sk), tunnel_id);
673 /* Special case: create tunnel context if session_id and
674 * peer_session_id is 0. Otherwise look up tunnel using supplied
677 if ((session_id == 0) && (peer_session_id == 0)) {
678 if (tunnel == NULL) {
679 struct l2tp_tunnel_cfg tcfg = {
680 .encap = L2TP_ENCAPTYPE_UDP,
683 error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel);
688 /* Error if we can't find the tunnel */
693 /* Error if socket is not prepped */
694 if (tunnel->sock == NULL)
698 if (tunnel->recv_payload_hook == NULL)
699 tunnel->recv_payload_hook = pppol2tp_recv_payload_hook;
701 if (tunnel->peer_tunnel_id == 0)
702 tunnel->peer_tunnel_id = peer_tunnel_id;
704 /* Create session if it doesn't already exist. We handle the
705 * case where a session was previously created by the netlink
706 * interface by checking that the session doesn't already have
707 * a socket and its tunnel socket are what we expect. If any
708 * of those checks fail, return EEXIST to the caller.
710 session = l2tp_session_find(sock_net(sk), tunnel, session_id);
711 if (session == NULL) {
712 /* Default MTU must allow space for UDP/L2TP/PPP
715 cfg.mtu = cfg.mru = 1500 - PPPOL2TP_HEADER_OVERHEAD;
717 /* Allocate and initialize a new session context. */
718 session = l2tp_session_create(sizeof(struct pppol2tp_session),
720 peer_session_id, &cfg);
721 if (session == NULL) {
726 ps = l2tp_session_priv(session);
728 if (ps->sock != NULL)
731 /* consistency checks */
732 if (ps->tunnel_sock != tunnel->sock)
736 /* Associate session with its PPPoL2TP socket */
737 ps = l2tp_session_priv(session);
738 ps->owner = current->pid;
740 ps->tunnel_sock = tunnel->sock;
742 session->recv_skb = pppol2tp_recv;
743 session->session_close = pppol2tp_session_close;
744 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
745 session->show = pppol2tp_show;
748 /* We need to know each time a skb is dropped from the reorder
751 session->ref = pppol2tp_session_sock_hold;
752 session->deref = pppol2tp_session_sock_put;
754 /* If PMTU discovery was enabled, use the MTU that was discovered */
755 dst = sk_dst_get(sk);
757 u32 pmtu = dst_mtu(__sk_dst_get(sk));
759 session->mtu = session->mru = pmtu -
760 PPPOL2TP_HEADER_OVERHEAD;
764 /* Special case: if source & dest session_id == 0x0000, this
765 * socket is being created to manage the tunnel. Just set up
766 * the internal context for use by ioctl() and sockopt()
769 if ((session->session_id == 0) &&
770 (session->peer_session_id == 0)) {
775 /* The only header we need to worry about is the L2TP
776 * header. This size is different depending on whether
777 * sequence numbers are enabled for the data channel.
779 po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
781 po->chan.private = sk;
782 po->chan.ops = &pppol2tp_chan_ops;
783 po->chan.mtu = session->mtu;
785 error = ppp_register_net_channel(sock_net(sk), &po->chan);
790 /* This is how we get the session context from the socket. */
791 sk->sk_user_data = session;
792 sk->sk_state = PPPOX_CONNECTED;
793 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: created\n",
802 #ifdef CONFIG_L2TP_V3
804 /* Called when creating sessions via the netlink interface.
806 static int pppol2tp_session_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg)
809 struct l2tp_tunnel *tunnel;
810 struct l2tp_session *session;
811 struct pppol2tp_session *ps;
813 tunnel = l2tp_tunnel_find(net, tunnel_id);
815 /* Error if we can't find the tunnel */
820 /* Error if tunnel socket is not prepped */
821 if (tunnel->sock == NULL)
824 /* Check that this session doesn't already exist */
826 session = l2tp_session_find(net, tunnel, session_id);
830 /* Default MTU values. */
832 cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
836 /* Allocate and initialize a new session context. */
838 session = l2tp_session_create(sizeof(struct pppol2tp_session),
840 peer_session_id, cfg);
844 ps = l2tp_session_priv(session);
845 ps->tunnel_sock = tunnel->sock;
847 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: created\n",
856 #endif /* CONFIG_L2TP_V3 */
858 /* getname() support.
860 static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
861 int *usockaddr_len, int peer)
865 struct l2tp_session *session;
866 struct l2tp_tunnel *tunnel;
867 struct sock *sk = sock->sk;
868 struct inet_sock *inet;
869 struct pppol2tp_session *pls;
874 if (sk->sk_state != PPPOX_CONNECTED)
878 session = pppol2tp_sock_to_session(sk);
882 pls = l2tp_session_priv(session);
883 tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock);
884 if (tunnel == NULL) {
889 inet = inet_sk(tunnel->sock);
890 if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) {
891 struct sockaddr_pppol2tp sp;
894 sp.sa_family = AF_PPPOX;
895 sp.sa_protocol = PX_PROTO_OL2TP;
896 sp.pppol2tp.fd = tunnel->fd;
897 sp.pppol2tp.pid = pls->owner;
898 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
899 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
900 sp.pppol2tp.s_session = session->session_id;
901 sp.pppol2tp.d_session = session->peer_session_id;
902 sp.pppol2tp.addr.sin_family = AF_INET;
903 sp.pppol2tp.addr.sin_port = inet->inet_dport;
904 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
905 memcpy(uaddr, &sp, len);
906 #if IS_ENABLED(CONFIG_IPV6)
907 } else if ((tunnel->version == 2) &&
908 (tunnel->sock->sk_family == AF_INET6)) {
909 struct ipv6_pinfo *np = inet6_sk(tunnel->sock);
910 struct sockaddr_pppol2tpin6 sp;
913 sp.sa_family = AF_PPPOX;
914 sp.sa_protocol = PX_PROTO_OL2TP;
915 sp.pppol2tp.fd = tunnel->fd;
916 sp.pppol2tp.pid = pls->owner;
917 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
918 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
919 sp.pppol2tp.s_session = session->session_id;
920 sp.pppol2tp.d_session = session->peer_session_id;
921 sp.pppol2tp.addr.sin6_family = AF_INET6;
922 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
923 memcpy(&sp.pppol2tp.addr.sin6_addr, &np->daddr,
925 memcpy(uaddr, &sp, len);
926 } else if ((tunnel->version == 3) &&
927 (tunnel->sock->sk_family == AF_INET6)) {
928 struct ipv6_pinfo *np = inet6_sk(tunnel->sock);
929 struct sockaddr_pppol2tpv3in6 sp;
932 sp.sa_family = AF_PPPOX;
933 sp.sa_protocol = PX_PROTO_OL2TP;
934 sp.pppol2tp.fd = tunnel->fd;
935 sp.pppol2tp.pid = pls->owner;
936 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
937 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
938 sp.pppol2tp.s_session = session->session_id;
939 sp.pppol2tp.d_session = session->peer_session_id;
940 sp.pppol2tp.addr.sin6_family = AF_INET6;
941 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
942 memcpy(&sp.pppol2tp.addr.sin6_addr, &np->daddr,
944 memcpy(uaddr, &sp, len);
946 } else if (tunnel->version == 3) {
947 struct sockaddr_pppol2tpv3 sp;
950 sp.sa_family = AF_PPPOX;
951 sp.sa_protocol = PX_PROTO_OL2TP;
952 sp.pppol2tp.fd = tunnel->fd;
953 sp.pppol2tp.pid = pls->owner;
954 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
955 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
956 sp.pppol2tp.s_session = session->session_id;
957 sp.pppol2tp.d_session = session->peer_session_id;
958 sp.pppol2tp.addr.sin_family = AF_INET;
959 sp.pppol2tp.addr.sin_port = inet->inet_dport;
960 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
961 memcpy(uaddr, &sp, len);
964 *usockaddr_len = len;
966 sock_put(pls->tunnel_sock);
975 /****************************************************************************
978 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
979 * sockets. However, in order to control kernel tunnel features, we allow
980 * userspace to create a special "tunnel" PPPoX socket which is used for
981 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
982 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
984 ****************************************************************************/
986 static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest,
987 struct l2tp_stats *stats)
989 dest->tx_packets = atomic_long_read(&stats->tx_packets);
990 dest->tx_bytes = atomic_long_read(&stats->tx_bytes);
991 dest->tx_errors = atomic_long_read(&stats->tx_errors);
992 dest->rx_packets = atomic_long_read(&stats->rx_packets);
993 dest->rx_bytes = atomic_long_read(&stats->rx_bytes);
994 dest->rx_seq_discards = atomic_long_read(&stats->rx_seq_discards);
995 dest->rx_oos_packets = atomic_long_read(&stats->rx_oos_packets);
996 dest->rx_errors = atomic_long_read(&stats->rx_errors);
999 /* Session ioctl helper.
1001 static int pppol2tp_session_ioctl(struct l2tp_session *session,
1002 unsigned int cmd, unsigned long arg)
1007 int val = (int) arg;
1008 struct pppol2tp_session *ps = l2tp_session_priv(session);
1009 struct l2tp_tunnel *tunnel = session->tunnel;
1010 struct pppol2tp_ioc_stats stats;
1012 l2tp_dbg(session, PPPOL2TP_MSG_CONTROL,
1013 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
1014 session->name, cmd, arg);
1022 if (!(sk->sk_state & PPPOX_CONNECTED))
1026 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1028 ifr.ifr_mtu = session->mtu;
1029 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
1032 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get mtu=%d\n",
1033 session->name, session->mtu);
1039 if (!(sk->sk_state & PPPOX_CONNECTED))
1043 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1046 session->mtu = ifr.ifr_mtu;
1048 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set mtu=%d\n",
1049 session->name, session->mtu);
1055 if (!(sk->sk_state & PPPOX_CONNECTED))
1059 if (put_user(session->mru, (int __user *) arg))
1062 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get mru=%d\n",
1063 session->name, session->mru);
1069 if (!(sk->sk_state & PPPOX_CONNECTED))
1073 if (get_user(val, (int __user *) arg))
1077 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set mru=%d\n",
1078 session->name, session->mru);
1084 if (put_user(ps->flags, (int __user *) arg))
1087 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get flags=%d\n",
1088 session->name, ps->flags);
1094 if (get_user(val, (int __user *) arg))
1097 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set flags=%d\n",
1098 session->name, ps->flags);
1102 case PPPIOCGL2TPSTATS:
1104 if (!(sk->sk_state & PPPOX_CONNECTED))
1107 memset(&stats, 0, sizeof(stats));
1108 stats.tunnel_id = tunnel->tunnel_id;
1109 stats.session_id = session->session_id;
1110 pppol2tp_copy_stats(&stats, &session->stats);
1111 if (copy_to_user((void __user *) arg, &stats,
1114 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1129 /* Tunnel ioctl helper.
1131 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1132 * specifies a session_id, the session ioctl handler is called. This allows an
1133 * application to retrieve session stats via a tunnel socket.
1135 static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
1136 unsigned int cmd, unsigned long arg)
1140 struct pppol2tp_ioc_stats stats;
1142 l2tp_dbg(tunnel, PPPOL2TP_MSG_CONTROL,
1143 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1144 tunnel->name, cmd, arg);
1150 case PPPIOCGL2TPSTATS:
1152 if (!(sk->sk_state & PPPOX_CONNECTED))
1155 if (copy_from_user(&stats, (void __user *) arg,
1160 if (stats.session_id != 0) {
1161 /* resend to session ioctl handler */
1162 struct l2tp_session *session =
1163 l2tp_session_find(sock_net(sk), tunnel, stats.session_id);
1164 if (session != NULL)
1165 err = pppol2tp_session_ioctl(session, cmd, arg);
1171 stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
1173 pppol2tp_copy_stats(&stats, &tunnel->stats);
1174 if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) {
1178 l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1193 /* Main ioctl() handler.
1194 * Dispatch to tunnel or session helpers depending on the socket.
1196 static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
1199 struct sock *sk = sock->sk;
1200 struct l2tp_session *session;
1201 struct l2tp_tunnel *tunnel;
1202 struct pppol2tp_session *ps;
1209 if (sock_flag(sk, SOCK_DEAD) != 0)
1213 if ((sk->sk_user_data == NULL) ||
1214 (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
1217 /* Get session context from the socket */
1219 session = pppol2tp_sock_to_session(sk);
1220 if (session == NULL)
1223 /* Special case: if session's session_id is zero, treat ioctl as a
1226 ps = l2tp_session_priv(session);
1227 if ((session->session_id == 0) &&
1228 (session->peer_session_id == 0)) {
1230 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1234 err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
1235 sock_put(ps->tunnel_sock);
1239 err = pppol2tp_session_ioctl(session, cmd, arg);
1247 /*****************************************************************************
1248 * setsockopt() / getsockopt() support.
1250 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1251 * sockets. In order to control kernel tunnel features, we allow userspace to
1252 * create a special "tunnel" PPPoX socket which is used for control only.
1253 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1254 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1255 *****************************************************************************/
1257 /* Tunnel setsockopt() helper.
1259 static int pppol2tp_tunnel_setsockopt(struct sock *sk,
1260 struct l2tp_tunnel *tunnel,
1261 int optname, int val)
1266 case PPPOL2TP_SO_DEBUG:
1267 tunnel->debug = val;
1268 l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: set debug=%x\n",
1269 tunnel->name, tunnel->debug);
1280 /* Session setsockopt helper.
1282 static int pppol2tp_session_setsockopt(struct sock *sk,
1283 struct l2tp_session *session,
1284 int optname, int val)
1287 struct pppol2tp_session *ps = l2tp_session_priv(session);
1290 case PPPOL2TP_SO_RECVSEQ:
1291 if ((val != 0) && (val != 1)) {
1295 session->recv_seq = val ? -1 : 0;
1296 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1297 "%s: set recv_seq=%d\n",
1298 session->name, session->recv_seq);
1301 case PPPOL2TP_SO_SENDSEQ:
1302 if ((val != 0) && (val != 1)) {
1306 session->send_seq = val ? -1 : 0;
1308 struct sock *ssk = ps->sock;
1309 struct pppox_sock *po = pppox_sk(ssk);
1310 po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
1311 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1313 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1314 "%s: set send_seq=%d\n",
1315 session->name, session->send_seq);
1318 case PPPOL2TP_SO_LNSMODE:
1319 if ((val != 0) && (val != 1)) {
1323 session->lns_mode = val ? -1 : 0;
1324 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1325 "%s: set lns_mode=%d\n",
1326 session->name, session->lns_mode);
1329 case PPPOL2TP_SO_DEBUG:
1330 session->debug = val;
1331 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set debug=%x\n",
1332 session->name, session->debug);
1335 case PPPOL2TP_SO_REORDERTO:
1336 session->reorder_timeout = msecs_to_jiffies(val);
1337 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1338 "%s: set reorder_timeout=%d\n",
1339 session->name, session->reorder_timeout);
1350 /* Main setsockopt() entry point.
1351 * Does API checks, then calls either the tunnel or session setsockopt
1352 * handler, according to whether the PPPoL2TP socket is a for a regular
1353 * session or the special tunnel type.
1355 static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
1356 char __user *optval, unsigned int optlen)
1358 struct sock *sk = sock->sk;
1359 struct l2tp_session *session;
1360 struct l2tp_tunnel *tunnel;
1361 struct pppol2tp_session *ps;
1365 if (level != SOL_PPPOL2TP)
1366 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
1368 if (optlen < sizeof(int))
1371 if (get_user(val, (int __user *)optval))
1375 if (sk->sk_user_data == NULL)
1378 /* Get session context from the socket */
1380 session = pppol2tp_sock_to_session(sk);
1381 if (session == NULL)
1384 /* Special case: if session_id == 0x0000, treat as operation on tunnel
1386 ps = l2tp_session_priv(session);
1387 if ((session->session_id == 0) &&
1388 (session->peer_session_id == 0)) {
1390 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1394 err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
1395 sock_put(ps->tunnel_sock);
1397 err = pppol2tp_session_setsockopt(sk, session, optname, val);
1407 /* Tunnel getsockopt helper. Called with sock locked.
1409 static int pppol2tp_tunnel_getsockopt(struct sock *sk,
1410 struct l2tp_tunnel *tunnel,
1411 int optname, int *val)
1416 case PPPOL2TP_SO_DEBUG:
1417 *val = tunnel->debug;
1418 l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: get debug=%x\n",
1419 tunnel->name, tunnel->debug);
1430 /* Session getsockopt helper. Called with sock locked.
1432 static int pppol2tp_session_getsockopt(struct sock *sk,
1433 struct l2tp_session *session,
1434 int optname, int *val)
1439 case PPPOL2TP_SO_RECVSEQ:
1440 *val = session->recv_seq;
1441 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1442 "%s: get recv_seq=%d\n", session->name, *val);
1445 case PPPOL2TP_SO_SENDSEQ:
1446 *val = session->send_seq;
1447 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1448 "%s: get send_seq=%d\n", session->name, *val);
1451 case PPPOL2TP_SO_LNSMODE:
1452 *val = session->lns_mode;
1453 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1454 "%s: get lns_mode=%d\n", session->name, *val);
1457 case PPPOL2TP_SO_DEBUG:
1458 *val = session->debug;
1459 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get debug=%d\n",
1460 session->name, *val);
1463 case PPPOL2TP_SO_REORDERTO:
1464 *val = (int) jiffies_to_msecs(session->reorder_timeout);
1465 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1466 "%s: get reorder_timeout=%d\n", session->name, *val);
1476 /* Main getsockopt() entry point.
1477 * Does API checks, then calls either the tunnel or session getsockopt
1478 * handler, according to whether the PPPoX socket is a for a regular session
1479 * or the special tunnel type.
1481 static int pppol2tp_getsockopt(struct socket *sock, int level, int optname,
1482 char __user *optval, int __user *optlen)
1484 struct sock *sk = sock->sk;
1485 struct l2tp_session *session;
1486 struct l2tp_tunnel *tunnel;
1489 struct pppol2tp_session *ps;
1491 if (level != SOL_PPPOL2TP)
1492 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
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 ps = l2tp_session_priv(session);
1514 if ((session->session_id == 0) &&
1515 (session->peer_session_id == 0)) {
1517 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1521 err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
1522 sock_put(ps->tunnel_sock);
1524 err = pppol2tp_session_getsockopt(sk, session, optname, &val);
1527 if (put_user(len, optlen))
1530 if (copy_to_user((void __user *) optval, &val, len))
1541 /*****************************************************************************
1542 * /proc filesystem for debug
1543 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1544 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1545 *****************************************************************************/
1547 static unsigned int pppol2tp_net_id;
1549 #ifdef CONFIG_PROC_FS
1551 struct pppol2tp_seq_data {
1552 struct seq_net_private p;
1553 int tunnel_idx; /* current tunnel */
1554 int session_idx; /* index of session within current tunnel */
1555 struct l2tp_tunnel *tunnel;
1556 struct l2tp_session *session; /* NULL means get next tunnel */
1559 static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
1562 pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx);
1565 if (pd->tunnel == NULL)
1568 /* Ignore L2TPv3 tunnels */
1569 if (pd->tunnel->version < 3)
1574 static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
1576 pd->session = l2tp_session_find_nth(pd->tunnel, pd->session_idx);
1579 if (pd->session == NULL) {
1580 pd->session_idx = 0;
1581 pppol2tp_next_tunnel(net, pd);
1585 static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
1587 struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
1594 BUG_ON(m->private == NULL);
1596 net = seq_file_net(m);
1598 if (pd->tunnel == NULL)
1599 pppol2tp_next_tunnel(net, pd);
1601 pppol2tp_next_session(net, pd);
1603 /* NULL tunnel and session indicates end of list */
1604 if ((pd->tunnel == NULL) && (pd->session == NULL))
1611 static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
1617 static void pppol2tp_seq_stop(struct seq_file *p, void *v)
1622 static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
1624 struct l2tp_tunnel *tunnel = v;
1626 seq_printf(m, "\nTUNNEL '%s', %c %d\n",
1628 (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
1629 atomic_read(&tunnel->ref_count) - 1);
1630 seq_printf(m, " %08x %ld/%ld/%ld %ld/%ld/%ld\n",
1632 atomic_long_read(&tunnel->stats.tx_packets),
1633 atomic_long_read(&tunnel->stats.tx_bytes),
1634 atomic_long_read(&tunnel->stats.tx_errors),
1635 atomic_long_read(&tunnel->stats.rx_packets),
1636 atomic_long_read(&tunnel->stats.rx_bytes),
1637 atomic_long_read(&tunnel->stats.rx_errors));
1640 static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
1642 struct l2tp_session *session = v;
1643 struct l2tp_tunnel *tunnel = session->tunnel;
1644 struct pppol2tp_session *ps = l2tp_session_priv(session);
1645 struct pppox_sock *po = pppox_sk(ps->sock);
1650 struct inet_sock *inet = inet_sk(tunnel->sock);
1651 ip = ntohl(inet->inet_saddr);
1652 port = ntohs(inet->inet_sport);
1655 seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
1656 "%04X/%04X %d %c\n",
1657 session->name, ip, port,
1659 session->session_id,
1660 tunnel->peer_tunnel_id,
1661 session->peer_session_id,
1663 (session == ps->sock->sk_user_data) ?
1665 seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n",
1666 session->mtu, session->mru,
1667 session->recv_seq ? 'R' : '-',
1668 session->send_seq ? 'S' : '-',
1669 session->lns_mode ? "LNS" : "LAC",
1671 jiffies_to_msecs(session->reorder_timeout));
1672 seq_printf(m, " %hu/%hu %ld/%ld/%ld %ld/%ld/%ld\n",
1673 session->nr, session->ns,
1674 atomic_long_read(&session->stats.tx_packets),
1675 atomic_long_read(&session->stats.tx_bytes),
1676 atomic_long_read(&session->stats.tx_errors),
1677 atomic_long_read(&session->stats.rx_packets),
1678 atomic_long_read(&session->stats.rx_bytes),
1679 atomic_long_read(&session->stats.rx_errors));
1682 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
1685 static int pppol2tp_seq_show(struct seq_file *m, void *v)
1687 struct pppol2tp_seq_data *pd = v;
1689 /* display header on line 1 */
1690 if (v == SEQ_START_TOKEN) {
1691 seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
1692 seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
1693 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1694 seq_puts(m, " SESSION name, addr/port src-tid/sid "
1695 "dest-tid/sid state user-data-ok\n");
1696 seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1697 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1701 /* Show the tunnel or session context.
1703 if (pd->session == NULL)
1704 pppol2tp_seq_tunnel_show(m, pd->tunnel);
1706 pppol2tp_seq_session_show(m, pd->session);
1712 static const struct seq_operations pppol2tp_seq_ops = {
1713 .start = pppol2tp_seq_start,
1714 .next = pppol2tp_seq_next,
1715 .stop = pppol2tp_seq_stop,
1716 .show = pppol2tp_seq_show,
1719 /* Called when our /proc file is opened. We allocate data for use when
1720 * iterating our tunnel / session contexts and store it in the private
1721 * data of the seq_file.
1723 static int pppol2tp_proc_open(struct inode *inode, struct file *file)
1725 return seq_open_net(inode, file, &pppol2tp_seq_ops,
1726 sizeof(struct pppol2tp_seq_data));
1729 static const struct file_operations pppol2tp_proc_fops = {
1730 .owner = THIS_MODULE,
1731 .open = pppol2tp_proc_open,
1733 .llseek = seq_lseek,
1734 .release = seq_release_net,
1737 #endif /* CONFIG_PROC_FS */
1739 /*****************************************************************************
1741 *****************************************************************************/
1743 static __net_init int pppol2tp_init_net(struct net *net)
1745 struct proc_dir_entry *pde;
1748 pde = proc_create("pppol2tp", S_IRUGO, net->proc_net,
1749 &pppol2tp_proc_fops);
1759 static __net_exit void pppol2tp_exit_net(struct net *net)
1761 remove_proc_entry("pppol2tp", net->proc_net);
1764 static struct pernet_operations pppol2tp_net_ops = {
1765 .init = pppol2tp_init_net,
1766 .exit = pppol2tp_exit_net,
1767 .id = &pppol2tp_net_id,
1770 /*****************************************************************************
1772 *****************************************************************************/
1774 static const struct proto_ops pppol2tp_ops = {
1776 .owner = THIS_MODULE,
1777 .release = pppol2tp_release,
1778 .bind = sock_no_bind,
1779 .connect = pppol2tp_connect,
1780 .socketpair = sock_no_socketpair,
1781 .accept = sock_no_accept,
1782 .getname = pppol2tp_getname,
1783 .poll = datagram_poll,
1784 .listen = sock_no_listen,
1785 .shutdown = sock_no_shutdown,
1786 .setsockopt = pppol2tp_setsockopt,
1787 .getsockopt = pppol2tp_getsockopt,
1788 .sendmsg = pppol2tp_sendmsg,
1789 .recvmsg = pppol2tp_recvmsg,
1790 .mmap = sock_no_mmap,
1791 .ioctl = pppox_ioctl,
1794 static const struct pppox_proto pppol2tp_proto = {
1795 .create = pppol2tp_create,
1796 .ioctl = pppol2tp_ioctl
1799 #ifdef CONFIG_L2TP_V3
1801 static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = {
1802 .session_create = pppol2tp_session_create,
1803 .session_delete = l2tp_session_delete,
1806 #endif /* CONFIG_L2TP_V3 */
1808 static int __init pppol2tp_init(void)
1812 err = register_pernet_device(&pppol2tp_net_ops);
1816 err = proto_register(&pppol2tp_sk_proto, 0);
1818 goto out_unregister_pppol2tp_pernet;
1820 err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
1822 goto out_unregister_pppol2tp_proto;
1824 #ifdef CONFIG_L2TP_V3
1825 err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops);
1827 goto out_unregister_pppox;
1830 pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION);
1835 #ifdef CONFIG_L2TP_V3
1836 out_unregister_pppox:
1837 unregister_pppox_proto(PX_PROTO_OL2TP);
1839 out_unregister_pppol2tp_proto:
1840 proto_unregister(&pppol2tp_sk_proto);
1841 out_unregister_pppol2tp_pernet:
1842 unregister_pernet_device(&pppol2tp_net_ops);
1846 static void __exit pppol2tp_exit(void)
1848 #ifdef CONFIG_L2TP_V3
1849 l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP);
1851 unregister_pppox_proto(PX_PROTO_OL2TP);
1852 proto_unregister(&pppol2tp_sk_proto);
1853 unregister_pernet_device(&pppol2tp_net_ops);
1856 module_init(pppol2tp_init);
1857 module_exit(pppol2tp_exit);
1859 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1860 MODULE_DESCRIPTION("PPP over L2TP over UDP");
1861 MODULE_LICENSE("GPL");
1862 MODULE_VERSION(PPPOL2TP_DRV_VERSION);
1863 MODULE_ALIAS("pppox-proto-" __stringify(PX_PROTO_OL2TP));