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;
471 if (sk->sk_user_data != NULL) {
472 session = sk->sk_user_data;
476 sk->sk_user_data = NULL;
477 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
478 l2tp_session_dec_refcount(session);
485 /* Called when the PPPoX socket (session) is closed.
487 static int pppol2tp_release(struct socket *sock)
489 struct sock *sk = sock->sk;
490 struct l2tp_session *session;
498 if (sock_flag(sk, SOCK_DEAD) != 0)
501 pppox_unbind_sock(sk);
503 /* Signal the death of the socket. */
504 sk->sk_state = PPPOX_DEAD;
508 session = pppol2tp_sock_to_session(sk);
510 /* Purge any queued data */
511 if (session != NULL) {
512 l2tp_session_queue_purge(session);
515 skb_queue_purge(&sk->sk_receive_queue);
516 skb_queue_purge(&sk->sk_write_queue);
520 /* This will delete the session context via
521 * pppol2tp_session_destruct() if the socket's refcnt drops to
533 static struct proto pppol2tp_sk_proto = {
535 .owner = THIS_MODULE,
536 .obj_size = sizeof(struct pppox_sock),
539 static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb)
543 rc = l2tp_udp_encap_recv(sk, skb);
547 return NET_RX_SUCCESS;
550 /* socket() handler. Initialize a new struct sock.
552 static int pppol2tp_create(struct net *net, struct socket *sock)
557 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto);
561 sock_init_data(sock, sk);
563 sock->state = SS_UNCONNECTED;
564 sock->ops = &pppol2tp_ops;
566 sk->sk_backlog_rcv = pppol2tp_backlog_recv;
567 sk->sk_protocol = PX_PROTO_OL2TP;
568 sk->sk_family = PF_PPPOX;
569 sk->sk_state = PPPOX_NONE;
570 sk->sk_type = SOCK_STREAM;
571 sk->sk_destruct = pppol2tp_session_destruct;
579 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
580 static void pppol2tp_show(struct seq_file *m, void *arg)
582 struct l2tp_session *session = arg;
583 struct pppol2tp_session *ps = l2tp_session_priv(session);
586 struct pppox_sock *po = pppox_sk(ps->sock);
588 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
593 /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
595 static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
596 int sockaddr_len, int flags)
598 struct sock *sk = sock->sk;
599 struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr;
600 struct pppox_sock *po = pppox_sk(sk);
601 struct l2tp_session *session = NULL;
602 struct l2tp_tunnel *tunnel;
603 struct pppol2tp_session *ps;
604 struct dst_entry *dst;
605 struct l2tp_session_cfg cfg = { 0, };
607 u32 tunnel_id, peer_tunnel_id;
608 u32 session_id, peer_session_id;
615 if (sp->sa_protocol != PX_PROTO_OL2TP)
618 /* Check for already bound sockets */
620 if (sk->sk_state & PPPOX_CONNECTED)
623 /* We don't supporting rebinding anyway */
625 if (sk->sk_user_data)
626 goto end; /* socket is already attached */
628 /* Get params from socket address. Handle L2TPv2 and L2TPv3.
629 * This is nasty because there are different sockaddr_pppol2tp
630 * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use
631 * the sockaddr size to determine which structure the caller
635 if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) {
636 fd = sp->pppol2tp.fd;
637 tunnel_id = sp->pppol2tp.s_tunnel;
638 peer_tunnel_id = sp->pppol2tp.d_tunnel;
639 session_id = sp->pppol2tp.s_session;
640 peer_session_id = sp->pppol2tp.d_session;
641 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) {
642 struct sockaddr_pppol2tpv3 *sp3 =
643 (struct sockaddr_pppol2tpv3 *) sp;
645 fd = sp3->pppol2tp.fd;
646 tunnel_id = sp3->pppol2tp.s_tunnel;
647 peer_tunnel_id = sp3->pppol2tp.d_tunnel;
648 session_id = sp3->pppol2tp.s_session;
649 peer_session_id = sp3->pppol2tp.d_session;
650 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpin6)) {
651 struct sockaddr_pppol2tpin6 *sp6 =
652 (struct sockaddr_pppol2tpin6 *) sp;
653 fd = sp6->pppol2tp.fd;
654 tunnel_id = sp6->pppol2tp.s_tunnel;
655 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
656 session_id = sp6->pppol2tp.s_session;
657 peer_session_id = sp6->pppol2tp.d_session;
658 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3in6)) {
659 struct sockaddr_pppol2tpv3in6 *sp6 =
660 (struct sockaddr_pppol2tpv3in6 *) sp;
662 fd = sp6->pppol2tp.fd;
663 tunnel_id = sp6->pppol2tp.s_tunnel;
664 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
665 session_id = sp6->pppol2tp.s_session;
666 peer_session_id = sp6->pppol2tp.d_session;
669 goto end; /* bad socket address */
672 /* Don't bind if tunnel_id is 0 */
677 tunnel = l2tp_tunnel_find(sock_net(sk), tunnel_id);
679 /* Special case: create tunnel context if session_id and
680 * peer_session_id is 0. Otherwise look up tunnel using supplied
683 if ((session_id == 0) && (peer_session_id == 0)) {
684 if (tunnel == NULL) {
685 struct l2tp_tunnel_cfg tcfg = {
686 .encap = L2TP_ENCAPTYPE_UDP,
689 error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel);
694 /* Error if we can't find the tunnel */
699 /* Error if socket is not prepped */
700 if (tunnel->sock == NULL)
704 if (tunnel->recv_payload_hook == NULL)
705 tunnel->recv_payload_hook = pppol2tp_recv_payload_hook;
707 if (tunnel->peer_tunnel_id == 0)
708 tunnel->peer_tunnel_id = peer_tunnel_id;
710 /* Create session if it doesn't already exist. We handle the
711 * case where a session was previously created by the netlink
712 * interface by checking that the session doesn't already have
713 * a socket and its tunnel socket are what we expect. If any
714 * of those checks fail, return EEXIST to the caller.
716 session = l2tp_session_find(sock_net(sk), tunnel, session_id);
717 if (session == NULL) {
718 /* Default MTU must allow space for UDP/L2TP/PPP
721 cfg.mtu = cfg.mru = 1500 - PPPOL2TP_HEADER_OVERHEAD;
723 /* Allocate and initialize a new session context. */
724 session = l2tp_session_create(sizeof(struct pppol2tp_session),
726 peer_session_id, &cfg);
727 if (session == NULL) {
732 ps = l2tp_session_priv(session);
734 if (ps->sock != NULL)
737 /* consistency checks */
738 if (ps->tunnel_sock != tunnel->sock)
742 /* Associate session with its PPPoL2TP socket */
743 ps = l2tp_session_priv(session);
744 ps->owner = current->pid;
746 ps->tunnel_sock = tunnel->sock;
748 session->recv_skb = pppol2tp_recv;
749 session->session_close = pppol2tp_session_close;
750 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
751 session->show = pppol2tp_show;
754 /* We need to know each time a skb is dropped from the reorder
757 session->ref = pppol2tp_session_sock_hold;
758 session->deref = pppol2tp_session_sock_put;
760 /* If PMTU discovery was enabled, use the MTU that was discovered */
761 dst = sk_dst_get(sk);
763 u32 pmtu = dst_mtu(__sk_dst_get(sk));
765 session->mtu = session->mru = pmtu -
766 PPPOL2TP_HEADER_OVERHEAD;
770 /* Special case: if source & dest session_id == 0x0000, this
771 * socket is being created to manage the tunnel. Just set up
772 * the internal context for use by ioctl() and sockopt()
775 if ((session->session_id == 0) &&
776 (session->peer_session_id == 0)) {
781 /* The only header we need to worry about is the L2TP
782 * header. This size is different depending on whether
783 * sequence numbers are enabled for the data channel.
785 po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
787 po->chan.private = sk;
788 po->chan.ops = &pppol2tp_chan_ops;
789 po->chan.mtu = session->mtu;
791 error = ppp_register_net_channel(sock_net(sk), &po->chan);
796 /* This is how we get the session context from the socket. */
797 sk->sk_user_data = session;
798 sk->sk_state = PPPOX_CONNECTED;
799 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: created\n",
808 #ifdef CONFIG_L2TP_V3
810 /* Called when creating sessions via the netlink interface.
812 static int pppol2tp_session_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg)
815 struct l2tp_tunnel *tunnel;
816 struct l2tp_session *session;
817 struct pppol2tp_session *ps;
819 tunnel = l2tp_tunnel_find(net, tunnel_id);
821 /* Error if we can't find the tunnel */
826 /* Error if tunnel socket is not prepped */
827 if (tunnel->sock == NULL)
830 /* Check that this session doesn't already exist */
832 session = l2tp_session_find(net, tunnel, session_id);
836 /* Default MTU values. */
838 cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
842 /* Allocate and initialize a new session context. */
844 session = l2tp_session_create(sizeof(struct pppol2tp_session),
846 peer_session_id, cfg);
850 ps = l2tp_session_priv(session);
851 ps->tunnel_sock = tunnel->sock;
853 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: created\n",
862 #endif /* CONFIG_L2TP_V3 */
864 /* getname() support.
866 static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
867 int *usockaddr_len, int peer)
871 struct l2tp_session *session;
872 struct l2tp_tunnel *tunnel;
873 struct sock *sk = sock->sk;
874 struct inet_sock *inet;
875 struct pppol2tp_session *pls;
880 if (sk->sk_state != PPPOX_CONNECTED)
884 session = pppol2tp_sock_to_session(sk);
888 pls = l2tp_session_priv(session);
889 tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock);
890 if (tunnel == NULL) {
895 inet = inet_sk(tunnel->sock);
896 if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) {
897 struct sockaddr_pppol2tp sp;
900 sp.sa_family = AF_PPPOX;
901 sp.sa_protocol = PX_PROTO_OL2TP;
902 sp.pppol2tp.fd = tunnel->fd;
903 sp.pppol2tp.pid = pls->owner;
904 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
905 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
906 sp.pppol2tp.s_session = session->session_id;
907 sp.pppol2tp.d_session = session->peer_session_id;
908 sp.pppol2tp.addr.sin_family = AF_INET;
909 sp.pppol2tp.addr.sin_port = inet->inet_dport;
910 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
911 memcpy(uaddr, &sp, len);
912 #if IS_ENABLED(CONFIG_IPV6)
913 } else if ((tunnel->version == 2) &&
914 (tunnel->sock->sk_family == AF_INET6)) {
915 struct ipv6_pinfo *np = inet6_sk(tunnel->sock);
916 struct sockaddr_pppol2tpin6 sp;
919 sp.sa_family = AF_PPPOX;
920 sp.sa_protocol = PX_PROTO_OL2TP;
921 sp.pppol2tp.fd = tunnel->fd;
922 sp.pppol2tp.pid = pls->owner;
923 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
924 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
925 sp.pppol2tp.s_session = session->session_id;
926 sp.pppol2tp.d_session = session->peer_session_id;
927 sp.pppol2tp.addr.sin6_family = AF_INET6;
928 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
929 memcpy(&sp.pppol2tp.addr.sin6_addr, &np->daddr,
931 memcpy(uaddr, &sp, len);
932 } else if ((tunnel->version == 3) &&
933 (tunnel->sock->sk_family == AF_INET6)) {
934 struct ipv6_pinfo *np = inet6_sk(tunnel->sock);
935 struct sockaddr_pppol2tpv3in6 sp;
938 sp.sa_family = AF_PPPOX;
939 sp.sa_protocol = PX_PROTO_OL2TP;
940 sp.pppol2tp.fd = tunnel->fd;
941 sp.pppol2tp.pid = pls->owner;
942 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
943 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
944 sp.pppol2tp.s_session = session->session_id;
945 sp.pppol2tp.d_session = session->peer_session_id;
946 sp.pppol2tp.addr.sin6_family = AF_INET6;
947 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
948 memcpy(&sp.pppol2tp.addr.sin6_addr, &np->daddr,
950 memcpy(uaddr, &sp, len);
952 } else if (tunnel->version == 3) {
953 struct sockaddr_pppol2tpv3 sp;
956 sp.sa_family = AF_PPPOX;
957 sp.sa_protocol = PX_PROTO_OL2TP;
958 sp.pppol2tp.fd = tunnel->fd;
959 sp.pppol2tp.pid = pls->owner;
960 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
961 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
962 sp.pppol2tp.s_session = session->session_id;
963 sp.pppol2tp.d_session = session->peer_session_id;
964 sp.pppol2tp.addr.sin_family = AF_INET;
965 sp.pppol2tp.addr.sin_port = inet->inet_dport;
966 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
967 memcpy(uaddr, &sp, len);
970 *usockaddr_len = len;
972 sock_put(pls->tunnel_sock);
981 /****************************************************************************
984 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
985 * sockets. However, in order to control kernel tunnel features, we allow
986 * userspace to create a special "tunnel" PPPoX socket which is used for
987 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
988 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
990 ****************************************************************************/
992 static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest,
993 struct l2tp_stats *stats)
995 dest->tx_packets = atomic_long_read(&stats->tx_packets);
996 dest->tx_bytes = atomic_long_read(&stats->tx_bytes);
997 dest->tx_errors = atomic_long_read(&stats->tx_errors);
998 dest->rx_packets = atomic_long_read(&stats->rx_packets);
999 dest->rx_bytes = atomic_long_read(&stats->rx_bytes);
1000 dest->rx_seq_discards = atomic_long_read(&stats->rx_seq_discards);
1001 dest->rx_oos_packets = atomic_long_read(&stats->rx_oos_packets);
1002 dest->rx_errors = atomic_long_read(&stats->rx_errors);
1005 /* Session ioctl helper.
1007 static int pppol2tp_session_ioctl(struct l2tp_session *session,
1008 unsigned int cmd, unsigned long arg)
1013 int val = (int) arg;
1014 struct pppol2tp_session *ps = l2tp_session_priv(session);
1015 struct l2tp_tunnel *tunnel = session->tunnel;
1016 struct pppol2tp_ioc_stats stats;
1018 l2tp_dbg(session, PPPOL2TP_MSG_CONTROL,
1019 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
1020 session->name, cmd, arg);
1028 if (!(sk->sk_state & PPPOX_CONNECTED))
1032 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1034 ifr.ifr_mtu = session->mtu;
1035 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
1038 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get mtu=%d\n",
1039 session->name, session->mtu);
1045 if (!(sk->sk_state & PPPOX_CONNECTED))
1049 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1052 session->mtu = ifr.ifr_mtu;
1054 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set mtu=%d\n",
1055 session->name, session->mtu);
1061 if (!(sk->sk_state & PPPOX_CONNECTED))
1065 if (put_user(session->mru, (int __user *) arg))
1068 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get mru=%d\n",
1069 session->name, session->mru);
1075 if (!(sk->sk_state & PPPOX_CONNECTED))
1079 if (get_user(val, (int __user *) arg))
1083 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set mru=%d\n",
1084 session->name, session->mru);
1090 if (put_user(ps->flags, (int __user *) arg))
1093 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get flags=%d\n",
1094 session->name, ps->flags);
1100 if (get_user(val, (int __user *) arg))
1103 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set flags=%d\n",
1104 session->name, ps->flags);
1108 case PPPIOCGL2TPSTATS:
1110 if (!(sk->sk_state & PPPOX_CONNECTED))
1113 memset(&stats, 0, sizeof(stats));
1114 stats.tunnel_id = tunnel->tunnel_id;
1115 stats.session_id = session->session_id;
1116 pppol2tp_copy_stats(&stats, &session->stats);
1117 if (copy_to_user((void __user *) arg, &stats,
1120 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1135 /* Tunnel ioctl helper.
1137 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1138 * specifies a session_id, the session ioctl handler is called. This allows an
1139 * application to retrieve session stats via a tunnel socket.
1141 static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
1142 unsigned int cmd, unsigned long arg)
1146 struct pppol2tp_ioc_stats stats;
1148 l2tp_dbg(tunnel, PPPOL2TP_MSG_CONTROL,
1149 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1150 tunnel->name, cmd, arg);
1156 case PPPIOCGL2TPSTATS:
1158 if (!(sk->sk_state & PPPOX_CONNECTED))
1161 if (copy_from_user(&stats, (void __user *) arg,
1166 if (stats.session_id != 0) {
1167 /* resend to session ioctl handler */
1168 struct l2tp_session *session =
1169 l2tp_session_find(sock_net(sk), tunnel, stats.session_id);
1170 if (session != NULL)
1171 err = pppol2tp_session_ioctl(session, cmd, arg);
1177 stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
1179 pppol2tp_copy_stats(&stats, &tunnel->stats);
1180 if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) {
1184 l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1199 /* Main ioctl() handler.
1200 * Dispatch to tunnel or session helpers depending on the socket.
1202 static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
1205 struct sock *sk = sock->sk;
1206 struct l2tp_session *session;
1207 struct l2tp_tunnel *tunnel;
1208 struct pppol2tp_session *ps;
1215 if (sock_flag(sk, SOCK_DEAD) != 0)
1219 if ((sk->sk_user_data == NULL) ||
1220 (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
1223 /* Get session context from the socket */
1225 session = pppol2tp_sock_to_session(sk);
1226 if (session == NULL)
1229 /* Special case: if session's session_id is zero, treat ioctl as a
1232 ps = l2tp_session_priv(session);
1233 if ((session->session_id == 0) &&
1234 (session->peer_session_id == 0)) {
1236 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1240 err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
1241 sock_put(ps->tunnel_sock);
1245 err = pppol2tp_session_ioctl(session, cmd, arg);
1253 /*****************************************************************************
1254 * setsockopt() / getsockopt() support.
1256 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1257 * sockets. In order to control kernel tunnel features, we allow userspace to
1258 * create a special "tunnel" PPPoX socket which is used for control only.
1259 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1260 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1261 *****************************************************************************/
1263 /* Tunnel setsockopt() helper.
1265 static int pppol2tp_tunnel_setsockopt(struct sock *sk,
1266 struct l2tp_tunnel *tunnel,
1267 int optname, int val)
1272 case PPPOL2TP_SO_DEBUG:
1273 tunnel->debug = val;
1274 l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: set debug=%x\n",
1275 tunnel->name, tunnel->debug);
1286 /* Session setsockopt helper.
1288 static int pppol2tp_session_setsockopt(struct sock *sk,
1289 struct l2tp_session *session,
1290 int optname, int val)
1293 struct pppol2tp_session *ps = l2tp_session_priv(session);
1296 case PPPOL2TP_SO_RECVSEQ:
1297 if ((val != 0) && (val != 1)) {
1301 session->recv_seq = val ? -1 : 0;
1302 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1303 "%s: set recv_seq=%d\n",
1304 session->name, session->recv_seq);
1307 case PPPOL2TP_SO_SENDSEQ:
1308 if ((val != 0) && (val != 1)) {
1312 session->send_seq = val ? -1 : 0;
1314 struct sock *ssk = ps->sock;
1315 struct pppox_sock *po = pppox_sk(ssk);
1316 po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
1317 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1319 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1320 "%s: set send_seq=%d\n",
1321 session->name, session->send_seq);
1324 case PPPOL2TP_SO_LNSMODE:
1325 if ((val != 0) && (val != 1)) {
1329 session->lns_mode = val ? -1 : 0;
1330 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1331 "%s: set lns_mode=%d\n",
1332 session->name, session->lns_mode);
1335 case PPPOL2TP_SO_DEBUG:
1336 session->debug = val;
1337 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set debug=%x\n",
1338 session->name, session->debug);
1341 case PPPOL2TP_SO_REORDERTO:
1342 session->reorder_timeout = msecs_to_jiffies(val);
1343 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1344 "%s: set reorder_timeout=%d\n",
1345 session->name, session->reorder_timeout);
1356 /* Main setsockopt() entry point.
1357 * Does API checks, then calls either the tunnel or session setsockopt
1358 * handler, according to whether the PPPoL2TP socket is a for a regular
1359 * session or the special tunnel type.
1361 static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
1362 char __user *optval, unsigned int optlen)
1364 struct sock *sk = sock->sk;
1365 struct l2tp_session *session;
1366 struct l2tp_tunnel *tunnel;
1367 struct pppol2tp_session *ps;
1371 if (level != SOL_PPPOL2TP)
1372 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
1374 if (optlen < sizeof(int))
1377 if (get_user(val, (int __user *)optval))
1381 if (sk->sk_user_data == NULL)
1384 /* Get session context from the socket */
1386 session = pppol2tp_sock_to_session(sk);
1387 if (session == NULL)
1390 /* Special case: if session_id == 0x0000, treat as operation on tunnel
1392 ps = l2tp_session_priv(session);
1393 if ((session->session_id == 0) &&
1394 (session->peer_session_id == 0)) {
1396 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1400 err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
1401 sock_put(ps->tunnel_sock);
1403 err = pppol2tp_session_setsockopt(sk, session, optname, val);
1413 /* Tunnel getsockopt helper. Called with sock locked.
1415 static int pppol2tp_tunnel_getsockopt(struct sock *sk,
1416 struct l2tp_tunnel *tunnel,
1417 int optname, int *val)
1422 case PPPOL2TP_SO_DEBUG:
1423 *val = tunnel->debug;
1424 l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: get debug=%x\n",
1425 tunnel->name, tunnel->debug);
1436 /* Session getsockopt helper. Called with sock locked.
1438 static int pppol2tp_session_getsockopt(struct sock *sk,
1439 struct l2tp_session *session,
1440 int optname, int *val)
1445 case PPPOL2TP_SO_RECVSEQ:
1446 *val = session->recv_seq;
1447 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1448 "%s: get recv_seq=%d\n", session->name, *val);
1451 case PPPOL2TP_SO_SENDSEQ:
1452 *val = session->send_seq;
1453 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1454 "%s: get send_seq=%d\n", session->name, *val);
1457 case PPPOL2TP_SO_LNSMODE:
1458 *val = session->lns_mode;
1459 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1460 "%s: get lns_mode=%d\n", session->name, *val);
1463 case PPPOL2TP_SO_DEBUG:
1464 *val = session->debug;
1465 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get debug=%d\n",
1466 session->name, *val);
1469 case PPPOL2TP_SO_REORDERTO:
1470 *val = (int) jiffies_to_msecs(session->reorder_timeout);
1471 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1472 "%s: get reorder_timeout=%d\n", session->name, *val);
1482 /* Main getsockopt() entry point.
1483 * Does API checks, then calls either the tunnel or session getsockopt
1484 * handler, according to whether the PPPoX socket is a for a regular session
1485 * or the special tunnel type.
1487 static int pppol2tp_getsockopt(struct socket *sock, int level, int optname,
1488 char __user *optval, int __user *optlen)
1490 struct sock *sk = sock->sk;
1491 struct l2tp_session *session;
1492 struct l2tp_tunnel *tunnel;
1495 struct pppol2tp_session *ps;
1497 if (level != SOL_PPPOL2TP)
1498 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1500 if (get_user(len, optlen))
1503 len = min_t(unsigned int, len, sizeof(int));
1509 if (sk->sk_user_data == NULL)
1512 /* Get the session context */
1514 session = pppol2tp_sock_to_session(sk);
1515 if (session == NULL)
1518 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1519 ps = l2tp_session_priv(session);
1520 if ((session->session_id == 0) &&
1521 (session->peer_session_id == 0)) {
1523 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1527 err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
1528 sock_put(ps->tunnel_sock);
1530 err = pppol2tp_session_getsockopt(sk, session, optname, &val);
1533 if (put_user(len, optlen))
1536 if (copy_to_user((void __user *) optval, &val, len))
1547 /*****************************************************************************
1548 * /proc filesystem for debug
1549 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1550 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1551 *****************************************************************************/
1553 static unsigned int pppol2tp_net_id;
1555 #ifdef CONFIG_PROC_FS
1557 struct pppol2tp_seq_data {
1558 struct seq_net_private p;
1559 int tunnel_idx; /* current tunnel */
1560 int session_idx; /* index of session within current tunnel */
1561 struct l2tp_tunnel *tunnel;
1562 struct l2tp_session *session; /* NULL means get next tunnel */
1565 static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
1568 pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx);
1571 if (pd->tunnel == NULL)
1574 /* Ignore L2TPv3 tunnels */
1575 if (pd->tunnel->version < 3)
1580 static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
1582 pd->session = l2tp_session_find_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)
1628 static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
1630 struct l2tp_tunnel *tunnel = v;
1632 seq_printf(m, "\nTUNNEL '%s', %c %d\n",
1634 (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
1635 atomic_read(&tunnel->ref_count) - 1);
1636 seq_printf(m, " %08x %ld/%ld/%ld %ld/%ld/%ld\n",
1638 atomic_long_read(&tunnel->stats.tx_packets),
1639 atomic_long_read(&tunnel->stats.tx_bytes),
1640 atomic_long_read(&tunnel->stats.tx_errors),
1641 atomic_long_read(&tunnel->stats.rx_packets),
1642 atomic_long_read(&tunnel->stats.rx_bytes),
1643 atomic_long_read(&tunnel->stats.rx_errors));
1646 static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
1648 struct l2tp_session *session = v;
1649 struct l2tp_tunnel *tunnel = session->tunnel;
1650 struct pppol2tp_session *ps = l2tp_session_priv(session);
1651 struct pppox_sock *po = pppox_sk(ps->sock);
1656 struct inet_sock *inet = inet_sk(tunnel->sock);
1657 ip = ntohl(inet->inet_saddr);
1658 port = ntohs(inet->inet_sport);
1661 seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
1662 "%04X/%04X %d %c\n",
1663 session->name, ip, port,
1665 session->session_id,
1666 tunnel->peer_tunnel_id,
1667 session->peer_session_id,
1669 (session == ps->sock->sk_user_data) ?
1671 seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n",
1672 session->mtu, session->mru,
1673 session->recv_seq ? 'R' : '-',
1674 session->send_seq ? 'S' : '-',
1675 session->lns_mode ? "LNS" : "LAC",
1677 jiffies_to_msecs(session->reorder_timeout));
1678 seq_printf(m, " %hu/%hu %ld/%ld/%ld %ld/%ld/%ld\n",
1679 session->nr, session->ns,
1680 atomic_long_read(&session->stats.tx_packets),
1681 atomic_long_read(&session->stats.tx_bytes),
1682 atomic_long_read(&session->stats.tx_errors),
1683 atomic_long_read(&session->stats.rx_packets),
1684 atomic_long_read(&session->stats.rx_bytes),
1685 atomic_long_read(&session->stats.rx_errors));
1688 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
1691 static int pppol2tp_seq_show(struct seq_file *m, void *v)
1693 struct pppol2tp_seq_data *pd = v;
1695 /* display header on line 1 */
1696 if (v == SEQ_START_TOKEN) {
1697 seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
1698 seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
1699 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1700 seq_puts(m, " SESSION name, addr/port src-tid/sid "
1701 "dest-tid/sid state user-data-ok\n");
1702 seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1703 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1707 /* Show the tunnel or session context.
1709 if (pd->session == NULL)
1710 pppol2tp_seq_tunnel_show(m, pd->tunnel);
1712 pppol2tp_seq_session_show(m, pd->session);
1718 static const struct seq_operations pppol2tp_seq_ops = {
1719 .start = pppol2tp_seq_start,
1720 .next = pppol2tp_seq_next,
1721 .stop = pppol2tp_seq_stop,
1722 .show = pppol2tp_seq_show,
1725 /* Called when our /proc file is opened. We allocate data for use when
1726 * iterating our tunnel / session contexts and store it in the private
1727 * data of the seq_file.
1729 static int pppol2tp_proc_open(struct inode *inode, struct file *file)
1731 return seq_open_net(inode, file, &pppol2tp_seq_ops,
1732 sizeof(struct pppol2tp_seq_data));
1735 static const struct file_operations pppol2tp_proc_fops = {
1736 .owner = THIS_MODULE,
1737 .open = pppol2tp_proc_open,
1739 .llseek = seq_lseek,
1740 .release = seq_release_net,
1743 #endif /* CONFIG_PROC_FS */
1745 /*****************************************************************************
1747 *****************************************************************************/
1749 static __net_init int pppol2tp_init_net(struct net *net)
1751 struct proc_dir_entry *pde;
1754 pde = proc_create("pppol2tp", S_IRUGO, net->proc_net,
1755 &pppol2tp_proc_fops);
1765 static __net_exit void pppol2tp_exit_net(struct net *net)
1767 remove_proc_entry("pppol2tp", net->proc_net);
1770 static struct pernet_operations pppol2tp_net_ops = {
1771 .init = pppol2tp_init_net,
1772 .exit = pppol2tp_exit_net,
1773 .id = &pppol2tp_net_id,
1776 /*****************************************************************************
1778 *****************************************************************************/
1780 static const struct proto_ops pppol2tp_ops = {
1782 .owner = THIS_MODULE,
1783 .release = pppol2tp_release,
1784 .bind = sock_no_bind,
1785 .connect = pppol2tp_connect,
1786 .socketpair = sock_no_socketpair,
1787 .accept = sock_no_accept,
1788 .getname = pppol2tp_getname,
1789 .poll = datagram_poll,
1790 .listen = sock_no_listen,
1791 .shutdown = sock_no_shutdown,
1792 .setsockopt = pppol2tp_setsockopt,
1793 .getsockopt = pppol2tp_getsockopt,
1794 .sendmsg = pppol2tp_sendmsg,
1795 .recvmsg = pppol2tp_recvmsg,
1796 .mmap = sock_no_mmap,
1797 .ioctl = pppox_ioctl,
1800 static const struct pppox_proto pppol2tp_proto = {
1801 .create = pppol2tp_create,
1802 .ioctl = pppol2tp_ioctl
1805 #ifdef CONFIG_L2TP_V3
1807 static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = {
1808 .session_create = pppol2tp_session_create,
1809 .session_delete = l2tp_session_delete,
1812 #endif /* CONFIG_L2TP_V3 */
1814 static int __init pppol2tp_init(void)
1818 err = register_pernet_device(&pppol2tp_net_ops);
1822 err = proto_register(&pppol2tp_sk_proto, 0);
1824 goto out_unregister_pppol2tp_pernet;
1826 err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
1828 goto out_unregister_pppol2tp_proto;
1830 #ifdef CONFIG_L2TP_V3
1831 err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops);
1833 goto out_unregister_pppox;
1836 pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION);
1841 #ifdef CONFIG_L2TP_V3
1842 out_unregister_pppox:
1843 unregister_pppox_proto(PX_PROTO_OL2TP);
1845 out_unregister_pppol2tp_proto:
1846 proto_unregister(&pppol2tp_sk_proto);
1847 out_unregister_pppol2tp_pernet:
1848 unregister_pernet_device(&pppol2tp_net_ops);
1852 static void __exit pppol2tp_exit(void)
1854 #ifdef CONFIG_L2TP_V3
1855 l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP);
1857 unregister_pppox_proto(PX_PROTO_OL2TP);
1858 proto_unregister(&pppol2tp_sk_proto);
1859 unregister_pernet_device(&pppol2tp_net_ops);
1862 module_init(pppol2tp_init);
1863 module_exit(pppol2tp_exit);
1865 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1866 MODULE_DESCRIPTION("PPP over L2TP over UDP");
1867 MODULE_LICENSE("GPL");
1868 MODULE_VERSION(PPPOL2TP_DRV_VERSION);
1869 MODULE_ALIAS("pppox-proto-" __stringify(PX_PROTO_OL2TP));