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)
201 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
202 flags & MSG_DONTWAIT, &err);
208 else if (len < skb->len)
209 msg->msg_flags |= MSG_TRUNC;
211 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len);
212 if (likely(err == 0))
220 static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
222 struct pppol2tp_session *ps = l2tp_session_priv(session);
223 struct sock *sk = NULL;
225 /* If the socket is bound, send it in to PPP's input queue. Otherwise
226 * queue it on the session socket.
232 if (sk->sk_state & PPPOX_BOUND) {
233 struct pppox_sock *po;
234 l2tp_dbg(session, PPPOL2TP_MSG_DATA,
235 "%s: recv %d byte data frame, passing to ppp\n",
236 session->name, data_len);
238 /* We need to forget all info related to the L2TP packet
239 * gathered in the skb as we are going to reuse the same
240 * skb for the inner packet.
242 * - reset xfrm (IPSec) information as it applies to
243 * the outer L2TP packet and not to the inner one
244 * - release the dst to force a route lookup on the inner
245 * IP packet since skb->dst currently points to the dst
247 * - reset netfilter information as it doesn't apply
248 * to the inner packet either
255 ppp_input(&po->chan, skb);
257 l2tp_dbg(session, PPPOL2TP_MSG_DATA,
258 "%s: recv %d byte data frame, passing to L2TP socket\n",
259 session->name, data_len);
261 if (sock_queue_rcv_skb(sk, skb) < 0) {
262 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_put(skb, total_len), m->msg_iov,
353 goto error_put_sess_tun;
357 l2tp_xmit_skb(session, skb, session->hdr_len);
360 sock_put(ps->tunnel_sock);
366 sock_put(ps->tunnel_sock);
373 /* Transmit function called by generic PPP driver. Sends PPP frame
374 * over PPPoL2TP socket.
376 * This is almost the same as pppol2tp_sendmsg(), but rather than
377 * being called with a msghdr from userspace, it is called with a skb
380 * The supplied skb from ppp doesn't have enough headroom for the
381 * insertion of L2TP, UDP and IP headers so we need to allocate more
382 * headroom in the skb. This will create a cloned skb. But we must be
383 * careful in the error case because the caller will expect to free
384 * the skb it supplied, not our cloned skb. So we take care to always
385 * leave the original skb unfreed if we return an error.
387 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
389 static const u8 ppph[2] = { 0xff, 0x03 };
390 struct sock *sk = (struct sock *) chan->private;
392 struct l2tp_session *session;
393 struct l2tp_tunnel *tunnel;
394 struct pppol2tp_session *ps;
397 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
400 /* Get session and tunnel contexts from the socket */
401 session = pppol2tp_sock_to_session(sk);
405 ps = l2tp_session_priv(session);
406 sk_tun = ps->tunnel_sock;
409 tunnel = l2tp_sock_to_tunnel(sk_tun);
413 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
414 headroom = NET_SKB_PAD +
415 sizeof(struct iphdr) + /* IP header */
416 uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */
417 session->hdr_len + /* L2TP header */
418 sizeof(ppph); /* PPP header */
419 if (skb_cow_head(skb, headroom))
420 goto abort_put_sess_tun;
422 /* Setup PPP header */
423 __skb_push(skb, sizeof(ppph));
424 skb->data[0] = ppph[0];
425 skb->data[1] = ppph[1];
428 l2tp_xmit_skb(session, skb, session->hdr_len);
440 /* Free the original skb */
445 /*****************************************************************************
446 * Session (and tunnel control) socket create/destroy.
447 *****************************************************************************/
449 /* Called by l2tp_core when a session socket is being closed.
451 static void pppol2tp_session_close(struct l2tp_session *session)
453 struct pppol2tp_session *ps = l2tp_session_priv(session);
454 struct sock *sk = ps->sock;
455 struct socket *sock = sk->sk_socket;
457 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
461 inet_shutdown(sock, 2);
462 /* Don't let the session go away before our socket does */
463 l2tp_session_inc_refcount(session);
468 /* Really kill the session socket. (Called from sock_put() if
471 static void pppol2tp_session_destruct(struct sock *sk)
473 struct l2tp_session *session = sk->sk_user_data;
475 sk->sk_user_data = NULL;
476 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
477 l2tp_session_dec_refcount(session);
482 /* Called when the PPPoX socket (session) is closed.
484 static int pppol2tp_release(struct socket *sock)
486 struct sock *sk = sock->sk;
487 struct l2tp_session *session;
495 if (sock_flag(sk, SOCK_DEAD) != 0)
498 pppox_unbind_sock(sk);
500 /* Signal the death of the socket. */
501 sk->sk_state = PPPOX_DEAD;
505 session = pppol2tp_sock_to_session(sk);
507 /* Purge any queued data */
508 if (session != NULL) {
509 __l2tp_session_unhash(session);
510 l2tp_session_queue_purge(session);
513 skb_queue_purge(&sk->sk_receive_queue);
514 skb_queue_purge(&sk->sk_write_queue);
518 /* This will delete the session context via
519 * pppol2tp_session_destruct() if the socket's refcnt drops to
531 static struct proto pppol2tp_sk_proto = {
533 .owner = THIS_MODULE,
534 .obj_size = sizeof(struct pppox_sock),
537 static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb)
541 rc = l2tp_udp_encap_recv(sk, skb);
545 return NET_RX_SUCCESS;
548 /* socket() handler. Initialize a new struct sock.
550 static int pppol2tp_create(struct net *net, struct socket *sock)
555 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto);
559 sock_init_data(sock, sk);
561 sock->state = SS_UNCONNECTED;
562 sock->ops = &pppol2tp_ops;
564 sk->sk_backlog_rcv = pppol2tp_backlog_recv;
565 sk->sk_protocol = PX_PROTO_OL2TP;
566 sk->sk_family = PF_PPPOX;
567 sk->sk_state = PPPOX_NONE;
568 sk->sk_type = SOCK_STREAM;
569 sk->sk_destruct = pppol2tp_session_destruct;
577 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
578 static void pppol2tp_show(struct seq_file *m, void *arg)
580 struct l2tp_session *session = arg;
581 struct pppol2tp_session *ps = l2tp_session_priv(session);
584 struct pppox_sock *po = pppox_sk(ps->sock);
586 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
591 /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
593 static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
594 int sockaddr_len, int flags)
596 struct sock *sk = sock->sk;
597 struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr;
598 struct pppox_sock *po = pppox_sk(sk);
599 struct l2tp_session *session = NULL;
600 struct l2tp_tunnel *tunnel;
601 struct pppol2tp_session *ps;
602 struct dst_entry *dst;
603 struct l2tp_session_cfg cfg = { 0, };
605 u32 tunnel_id, peer_tunnel_id;
606 u32 session_id, peer_session_id;
613 if (sp->sa_protocol != PX_PROTO_OL2TP)
616 /* Check for already bound sockets */
618 if (sk->sk_state & PPPOX_CONNECTED)
621 /* We don't supporting rebinding anyway */
623 if (sk->sk_user_data)
624 goto end; /* socket is already attached */
626 /* Get params from socket address. Handle L2TPv2 and L2TPv3.
627 * This is nasty because there are different sockaddr_pppol2tp
628 * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use
629 * the sockaddr size to determine which structure the caller
633 if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) {
634 fd = sp->pppol2tp.fd;
635 tunnel_id = sp->pppol2tp.s_tunnel;
636 peer_tunnel_id = sp->pppol2tp.d_tunnel;
637 session_id = sp->pppol2tp.s_session;
638 peer_session_id = sp->pppol2tp.d_session;
639 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) {
640 struct sockaddr_pppol2tpv3 *sp3 =
641 (struct sockaddr_pppol2tpv3 *) sp;
643 fd = sp3->pppol2tp.fd;
644 tunnel_id = sp3->pppol2tp.s_tunnel;
645 peer_tunnel_id = sp3->pppol2tp.d_tunnel;
646 session_id = sp3->pppol2tp.s_session;
647 peer_session_id = sp3->pppol2tp.d_session;
648 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpin6)) {
649 struct sockaddr_pppol2tpin6 *sp6 =
650 (struct sockaddr_pppol2tpin6 *) sp;
651 fd = sp6->pppol2tp.fd;
652 tunnel_id = sp6->pppol2tp.s_tunnel;
653 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
654 session_id = sp6->pppol2tp.s_session;
655 peer_session_id = sp6->pppol2tp.d_session;
656 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3in6)) {
657 struct sockaddr_pppol2tpv3in6 *sp6 =
658 (struct sockaddr_pppol2tpv3in6 *) sp;
660 fd = sp6->pppol2tp.fd;
661 tunnel_id = sp6->pppol2tp.s_tunnel;
662 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
663 session_id = sp6->pppol2tp.s_session;
664 peer_session_id = sp6->pppol2tp.d_session;
667 goto end; /* bad socket address */
670 /* Don't bind if tunnel_id is 0 */
675 tunnel = l2tp_tunnel_find(sock_net(sk), tunnel_id);
677 /* Special case: create tunnel context if session_id and
678 * peer_session_id is 0. Otherwise look up tunnel using supplied
681 if ((session_id == 0) && (peer_session_id == 0)) {
682 if (tunnel == NULL) {
683 struct l2tp_tunnel_cfg tcfg = {
684 .encap = L2TP_ENCAPTYPE_UDP,
687 error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel);
692 /* Error if we can't find the tunnel */
697 /* Error if socket is not prepped */
698 if (tunnel->sock == NULL)
702 if (tunnel->recv_payload_hook == NULL)
703 tunnel->recv_payload_hook = pppol2tp_recv_payload_hook;
705 if (tunnel->peer_tunnel_id == 0)
706 tunnel->peer_tunnel_id = peer_tunnel_id;
708 /* Create session if it doesn't already exist. We handle the
709 * case where a session was previously created by the netlink
710 * interface by checking that the session doesn't already have
711 * a socket and its tunnel socket are what we expect. If any
712 * of those checks fail, return EEXIST to the caller.
714 session = l2tp_session_find(sock_net(sk), tunnel, session_id);
715 if (session == NULL) {
716 /* Default MTU must allow space for UDP/L2TP/PPP
719 cfg.mtu = cfg.mru = 1500 - PPPOL2TP_HEADER_OVERHEAD;
721 /* Allocate and initialize a new session context. */
722 session = l2tp_session_create(sizeof(struct pppol2tp_session),
724 peer_session_id, &cfg);
725 if (session == NULL) {
730 ps = l2tp_session_priv(session);
732 if (ps->sock != NULL)
735 /* consistency checks */
736 if (ps->tunnel_sock != tunnel->sock)
740 /* Associate session with its PPPoL2TP socket */
741 ps = l2tp_session_priv(session);
742 ps->owner = current->pid;
744 ps->tunnel_sock = tunnel->sock;
746 session->recv_skb = pppol2tp_recv;
747 session->session_close = pppol2tp_session_close;
748 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
749 session->show = pppol2tp_show;
752 /* We need to know each time a skb is dropped from the reorder
755 session->ref = pppol2tp_session_sock_hold;
756 session->deref = pppol2tp_session_sock_put;
758 /* If PMTU discovery was enabled, use the MTU that was discovered */
759 dst = sk_dst_get(sk);
761 u32 pmtu = dst_mtu(__sk_dst_get(sk));
763 session->mtu = session->mru = pmtu -
764 PPPOL2TP_HEADER_OVERHEAD;
768 /* Special case: if source & dest session_id == 0x0000, this
769 * socket is being created to manage the tunnel. Just set up
770 * the internal context for use by ioctl() and sockopt()
773 if ((session->session_id == 0) &&
774 (session->peer_session_id == 0)) {
779 /* The only header we need to worry about is the L2TP
780 * header. This size is different depending on whether
781 * sequence numbers are enabled for the data channel.
783 po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
785 po->chan.private = sk;
786 po->chan.ops = &pppol2tp_chan_ops;
787 po->chan.mtu = session->mtu;
789 error = ppp_register_net_channel(sock_net(sk), &po->chan);
794 /* This is how we get the session context from the socket. */
795 sk->sk_user_data = session;
796 sk->sk_state = PPPOX_CONNECTED;
797 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: created\n",
806 #ifdef CONFIG_L2TP_V3
808 /* Called when creating sessions via the netlink interface.
810 static int pppol2tp_session_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg)
813 struct l2tp_tunnel *tunnel;
814 struct l2tp_session *session;
815 struct pppol2tp_session *ps;
817 tunnel = l2tp_tunnel_find(net, tunnel_id);
819 /* Error if we can't find the tunnel */
824 /* Error if tunnel socket is not prepped */
825 if (tunnel->sock == NULL)
828 /* Check that this session doesn't already exist */
830 session = l2tp_session_find(net, tunnel, session_id);
834 /* Default MTU values. */
836 cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
840 /* Allocate and initialize a new session context. */
842 session = l2tp_session_create(sizeof(struct pppol2tp_session),
844 peer_session_id, cfg);
848 ps = l2tp_session_priv(session);
849 ps->tunnel_sock = tunnel->sock;
851 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: created\n",
860 #endif /* CONFIG_L2TP_V3 */
862 /* getname() support.
864 static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
865 int *usockaddr_len, int peer)
869 struct l2tp_session *session;
870 struct l2tp_tunnel *tunnel;
871 struct sock *sk = sock->sk;
872 struct inet_sock *inet;
873 struct pppol2tp_session *pls;
878 if (sk->sk_state != PPPOX_CONNECTED)
882 session = pppol2tp_sock_to_session(sk);
886 pls = l2tp_session_priv(session);
887 tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock);
888 if (tunnel == NULL) {
893 inet = inet_sk(tunnel->sock);
894 if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) {
895 struct sockaddr_pppol2tp sp;
898 sp.sa_family = AF_PPPOX;
899 sp.sa_protocol = PX_PROTO_OL2TP;
900 sp.pppol2tp.fd = tunnel->fd;
901 sp.pppol2tp.pid = pls->owner;
902 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
903 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
904 sp.pppol2tp.s_session = session->session_id;
905 sp.pppol2tp.d_session = session->peer_session_id;
906 sp.pppol2tp.addr.sin_family = AF_INET;
907 sp.pppol2tp.addr.sin_port = inet->inet_dport;
908 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
909 memcpy(uaddr, &sp, len);
910 #if IS_ENABLED(CONFIG_IPV6)
911 } else if ((tunnel->version == 2) &&
912 (tunnel->sock->sk_family == AF_INET6)) {
913 struct sockaddr_pppol2tpin6 sp;
917 sp.sa_family = AF_PPPOX;
918 sp.sa_protocol = PX_PROTO_OL2TP;
919 sp.pppol2tp.fd = tunnel->fd;
920 sp.pppol2tp.pid = pls->owner;
921 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
922 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
923 sp.pppol2tp.s_session = session->session_id;
924 sp.pppol2tp.d_session = session->peer_session_id;
925 sp.pppol2tp.addr.sin6_family = AF_INET6;
926 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
927 memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
928 sizeof(tunnel->sock->sk_v6_daddr));
929 memcpy(uaddr, &sp, len);
930 } else if ((tunnel->version == 3) &&
931 (tunnel->sock->sk_family == AF_INET6)) {
932 struct sockaddr_pppol2tpv3in6 sp;
936 sp.sa_family = AF_PPPOX;
937 sp.sa_protocol = PX_PROTO_OL2TP;
938 sp.pppol2tp.fd = tunnel->fd;
939 sp.pppol2tp.pid = pls->owner;
940 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
941 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
942 sp.pppol2tp.s_session = session->session_id;
943 sp.pppol2tp.d_session = session->peer_session_id;
944 sp.pppol2tp.addr.sin6_family = AF_INET6;
945 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
946 memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
947 sizeof(tunnel->sock->sk_v6_daddr));
948 memcpy(uaddr, &sp, len);
950 } else if (tunnel->version == 3) {
951 struct sockaddr_pppol2tpv3 sp;
954 sp.sa_family = AF_PPPOX;
955 sp.sa_protocol = PX_PROTO_OL2TP;
956 sp.pppol2tp.fd = tunnel->fd;
957 sp.pppol2tp.pid = pls->owner;
958 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
959 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
960 sp.pppol2tp.s_session = session->session_id;
961 sp.pppol2tp.d_session = session->peer_session_id;
962 sp.pppol2tp.addr.sin_family = AF_INET;
963 sp.pppol2tp.addr.sin_port = inet->inet_dport;
964 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
965 memcpy(uaddr, &sp, len);
968 *usockaddr_len = len;
970 sock_put(pls->tunnel_sock);
979 /****************************************************************************
982 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
983 * sockets. However, in order to control kernel tunnel features, we allow
984 * userspace to create a special "tunnel" PPPoX socket which is used for
985 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
986 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
988 ****************************************************************************/
990 static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest,
991 struct l2tp_stats *stats)
993 dest->tx_packets = atomic_long_read(&stats->tx_packets);
994 dest->tx_bytes = atomic_long_read(&stats->tx_bytes);
995 dest->tx_errors = atomic_long_read(&stats->tx_errors);
996 dest->rx_packets = atomic_long_read(&stats->rx_packets);
997 dest->rx_bytes = atomic_long_read(&stats->rx_bytes);
998 dest->rx_seq_discards = atomic_long_read(&stats->rx_seq_discards);
999 dest->rx_oos_packets = atomic_long_read(&stats->rx_oos_packets);
1000 dest->rx_errors = atomic_long_read(&stats->rx_errors);
1003 /* Session ioctl helper.
1005 static int pppol2tp_session_ioctl(struct l2tp_session *session,
1006 unsigned int cmd, unsigned long arg)
1011 int val = (int) arg;
1012 struct pppol2tp_session *ps = l2tp_session_priv(session);
1013 struct l2tp_tunnel *tunnel = session->tunnel;
1014 struct pppol2tp_ioc_stats stats;
1016 l2tp_dbg(session, PPPOL2TP_MSG_CONTROL,
1017 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
1018 session->name, cmd, arg);
1026 if (!(sk->sk_state & PPPOX_CONNECTED))
1030 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1032 ifr.ifr_mtu = session->mtu;
1033 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
1036 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get mtu=%d\n",
1037 session->name, session->mtu);
1043 if (!(sk->sk_state & PPPOX_CONNECTED))
1047 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1050 session->mtu = ifr.ifr_mtu;
1052 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set mtu=%d\n",
1053 session->name, session->mtu);
1059 if (!(sk->sk_state & PPPOX_CONNECTED))
1063 if (put_user(session->mru, (int __user *) arg))
1066 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get mru=%d\n",
1067 session->name, session->mru);
1073 if (!(sk->sk_state & PPPOX_CONNECTED))
1077 if (get_user(val, (int __user *) arg))
1081 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set mru=%d\n",
1082 session->name, session->mru);
1088 if (put_user(ps->flags, (int __user *) arg))
1091 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get flags=%d\n",
1092 session->name, ps->flags);
1098 if (get_user(val, (int __user *) arg))
1101 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set flags=%d\n",
1102 session->name, ps->flags);
1106 case PPPIOCGL2TPSTATS:
1108 if (!(sk->sk_state & PPPOX_CONNECTED))
1111 memset(&stats, 0, sizeof(stats));
1112 stats.tunnel_id = tunnel->tunnel_id;
1113 stats.session_id = session->session_id;
1114 pppol2tp_copy_stats(&stats, &session->stats);
1115 if (copy_to_user((void __user *) arg, &stats,
1118 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1133 /* Tunnel ioctl helper.
1135 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1136 * specifies a session_id, the session ioctl handler is called. This allows an
1137 * application to retrieve session stats via a tunnel socket.
1139 static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
1140 unsigned int cmd, unsigned long arg)
1144 struct pppol2tp_ioc_stats stats;
1146 l2tp_dbg(tunnel, PPPOL2TP_MSG_CONTROL,
1147 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1148 tunnel->name, cmd, arg);
1154 case PPPIOCGL2TPSTATS:
1156 if (!(sk->sk_state & PPPOX_CONNECTED))
1159 if (copy_from_user(&stats, (void __user *) arg,
1164 if (stats.session_id != 0) {
1165 /* resend to session ioctl handler */
1166 struct l2tp_session *session =
1167 l2tp_session_find(sock_net(sk), tunnel, stats.session_id);
1168 if (session != NULL)
1169 err = pppol2tp_session_ioctl(session, cmd, arg);
1175 stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
1177 pppol2tp_copy_stats(&stats, &tunnel->stats);
1178 if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) {
1182 l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1197 /* Main ioctl() handler.
1198 * Dispatch to tunnel or session helpers depending on the socket.
1200 static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
1203 struct sock *sk = sock->sk;
1204 struct l2tp_session *session;
1205 struct l2tp_tunnel *tunnel;
1206 struct pppol2tp_session *ps;
1213 if (sock_flag(sk, SOCK_DEAD) != 0)
1217 if ((sk->sk_user_data == NULL) ||
1218 (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
1221 /* Get session context from the socket */
1223 session = pppol2tp_sock_to_session(sk);
1224 if (session == NULL)
1227 /* Special case: if session's session_id is zero, treat ioctl as a
1230 ps = l2tp_session_priv(session);
1231 if ((session->session_id == 0) &&
1232 (session->peer_session_id == 0)) {
1234 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1238 err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
1239 sock_put(ps->tunnel_sock);
1243 err = pppol2tp_session_ioctl(session, cmd, arg);
1251 /*****************************************************************************
1252 * setsockopt() / getsockopt() support.
1254 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1255 * sockets. In order to control kernel tunnel features, we allow userspace to
1256 * create a special "tunnel" PPPoX socket which is used for control only.
1257 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1258 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1259 *****************************************************************************/
1261 /* Tunnel setsockopt() helper.
1263 static int pppol2tp_tunnel_setsockopt(struct sock *sk,
1264 struct l2tp_tunnel *tunnel,
1265 int optname, int val)
1270 case PPPOL2TP_SO_DEBUG:
1271 tunnel->debug = val;
1272 l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: set debug=%x\n",
1273 tunnel->name, tunnel->debug);
1284 /* Session setsockopt helper.
1286 static int pppol2tp_session_setsockopt(struct sock *sk,
1287 struct l2tp_session *session,
1288 int optname, int val)
1291 struct pppol2tp_session *ps = l2tp_session_priv(session);
1294 case PPPOL2TP_SO_RECVSEQ:
1295 if ((val != 0) && (val != 1)) {
1299 session->recv_seq = val ? -1 : 0;
1300 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1301 "%s: set recv_seq=%d\n",
1302 session->name, session->recv_seq);
1305 case PPPOL2TP_SO_SENDSEQ:
1306 if ((val != 0) && (val != 1)) {
1310 session->send_seq = val ? -1 : 0;
1312 struct sock *ssk = ps->sock;
1313 struct pppox_sock *po = pppox_sk(ssk);
1314 po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
1315 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1317 l2tp_session_set_header_len(session, session->tunnel->version);
1318 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1319 "%s: set send_seq=%d\n",
1320 session->name, session->send_seq);
1323 case PPPOL2TP_SO_LNSMODE:
1324 if ((val != 0) && (val != 1)) {
1328 session->lns_mode = val ? -1 : 0;
1329 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1330 "%s: set lns_mode=%d\n",
1331 session->name, session->lns_mode);
1334 case PPPOL2TP_SO_DEBUG:
1335 session->debug = val;
1336 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: set debug=%x\n",
1337 session->name, session->debug);
1340 case PPPOL2TP_SO_REORDERTO:
1341 session->reorder_timeout = msecs_to_jiffies(val);
1342 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1343 "%s: set reorder_timeout=%d\n",
1344 session->name, session->reorder_timeout);
1355 /* Main setsockopt() entry point.
1356 * Does API checks, then calls either the tunnel or session setsockopt
1357 * handler, according to whether the PPPoL2TP socket is a for a regular
1358 * session or the special tunnel type.
1360 static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
1361 char __user *optval, unsigned int optlen)
1363 struct sock *sk = sock->sk;
1364 struct l2tp_session *session;
1365 struct l2tp_tunnel *tunnel;
1366 struct pppol2tp_session *ps;
1370 if (level != SOL_PPPOL2TP)
1371 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
1373 if (optlen < sizeof(int))
1376 if (get_user(val, (int __user *)optval))
1380 if (sk->sk_user_data == NULL)
1383 /* Get session context from the socket */
1385 session = pppol2tp_sock_to_session(sk);
1386 if (session == NULL)
1389 /* Special case: if session_id == 0x0000, treat as operation on tunnel
1391 ps = l2tp_session_priv(session);
1392 if ((session->session_id == 0) &&
1393 (session->peer_session_id == 0)) {
1395 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1399 err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
1400 sock_put(ps->tunnel_sock);
1402 err = pppol2tp_session_setsockopt(sk, session, optname, val);
1412 /* Tunnel getsockopt helper. Called with sock locked.
1414 static int pppol2tp_tunnel_getsockopt(struct sock *sk,
1415 struct l2tp_tunnel *tunnel,
1416 int optname, int *val)
1421 case PPPOL2TP_SO_DEBUG:
1422 *val = tunnel->debug;
1423 l2tp_info(tunnel, PPPOL2TP_MSG_CONTROL, "%s: get debug=%x\n",
1424 tunnel->name, tunnel->debug);
1435 /* Session getsockopt helper. Called with sock locked.
1437 static int pppol2tp_session_getsockopt(struct sock *sk,
1438 struct l2tp_session *session,
1439 int optname, int *val)
1444 case PPPOL2TP_SO_RECVSEQ:
1445 *val = session->recv_seq;
1446 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1447 "%s: get recv_seq=%d\n", session->name, *val);
1450 case PPPOL2TP_SO_SENDSEQ:
1451 *val = session->send_seq;
1452 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1453 "%s: get send_seq=%d\n", session->name, *val);
1456 case PPPOL2TP_SO_LNSMODE:
1457 *val = session->lns_mode;
1458 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1459 "%s: get lns_mode=%d\n", session->name, *val);
1462 case PPPOL2TP_SO_DEBUG:
1463 *val = session->debug;
1464 l2tp_info(session, PPPOL2TP_MSG_CONTROL, "%s: get debug=%d\n",
1465 session->name, *val);
1468 case PPPOL2TP_SO_REORDERTO:
1469 *val = (int) jiffies_to_msecs(session->reorder_timeout);
1470 l2tp_info(session, PPPOL2TP_MSG_CONTROL,
1471 "%s: get reorder_timeout=%d\n", session->name, *val);
1481 /* Main getsockopt() entry point.
1482 * Does API checks, then calls either the tunnel or session getsockopt
1483 * handler, according to whether the PPPoX socket is a for a regular session
1484 * or the special tunnel type.
1486 static int pppol2tp_getsockopt(struct socket *sock, int level, int optname,
1487 char __user *optval, int __user *optlen)
1489 struct sock *sk = sock->sk;
1490 struct l2tp_session *session;
1491 struct l2tp_tunnel *tunnel;
1494 struct pppol2tp_session *ps;
1496 if (level != SOL_PPPOL2TP)
1497 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1499 if (get_user(len, optlen))
1502 len = min_t(unsigned int, len, sizeof(int));
1508 if (sk->sk_user_data == NULL)
1511 /* Get the session context */
1513 session = pppol2tp_sock_to_session(sk);
1514 if (session == NULL)
1517 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1518 ps = l2tp_session_priv(session);
1519 if ((session->session_id == 0) &&
1520 (session->peer_session_id == 0)) {
1522 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1526 err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
1527 sock_put(ps->tunnel_sock);
1529 err = pppol2tp_session_getsockopt(sk, session, optname, &val);
1532 if (put_user(len, optlen))
1535 if (copy_to_user((void __user *) optval, &val, len))
1546 /*****************************************************************************
1547 * /proc filesystem for debug
1548 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1549 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1550 *****************************************************************************/
1552 static unsigned int pppol2tp_net_id;
1554 #ifdef CONFIG_PROC_FS
1556 struct pppol2tp_seq_data {
1557 struct seq_net_private p;
1558 int tunnel_idx; /* current tunnel */
1559 int session_idx; /* index of session within current tunnel */
1560 struct l2tp_tunnel *tunnel;
1561 struct l2tp_session *session; /* NULL means get next tunnel */
1564 static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
1567 pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx);
1570 if (pd->tunnel == NULL)
1573 /* Ignore L2TPv3 tunnels */
1574 if (pd->tunnel->version < 3)
1579 static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
1581 pd->session = l2tp_session_find_nth(pd->tunnel, pd->session_idx);
1584 if (pd->session == NULL) {
1585 pd->session_idx = 0;
1586 pppol2tp_next_tunnel(net, pd);
1590 static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
1592 struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
1599 BUG_ON(m->private == NULL);
1601 net = seq_file_net(m);
1603 if (pd->tunnel == NULL)
1604 pppol2tp_next_tunnel(net, pd);
1606 pppol2tp_next_session(net, pd);
1608 /* NULL tunnel and session indicates end of list */
1609 if ((pd->tunnel == NULL) && (pd->session == NULL))
1616 static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
1622 static void pppol2tp_seq_stop(struct seq_file *p, void *v)
1627 static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
1629 struct l2tp_tunnel *tunnel = v;
1631 seq_printf(m, "\nTUNNEL '%s', %c %d\n",
1633 (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
1634 atomic_read(&tunnel->ref_count) - 1);
1635 seq_printf(m, " %08x %ld/%ld/%ld %ld/%ld/%ld\n",
1637 atomic_long_read(&tunnel->stats.tx_packets),
1638 atomic_long_read(&tunnel->stats.tx_bytes),
1639 atomic_long_read(&tunnel->stats.tx_errors),
1640 atomic_long_read(&tunnel->stats.rx_packets),
1641 atomic_long_read(&tunnel->stats.rx_bytes),
1642 atomic_long_read(&tunnel->stats.rx_errors));
1645 static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
1647 struct l2tp_session *session = v;
1648 struct l2tp_tunnel *tunnel = session->tunnel;
1649 struct pppol2tp_session *ps = l2tp_session_priv(session);
1650 struct pppox_sock *po = pppox_sk(ps->sock);
1655 struct inet_sock *inet = inet_sk(tunnel->sock);
1656 ip = ntohl(inet->inet_saddr);
1657 port = ntohs(inet->inet_sport);
1660 seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
1661 "%04X/%04X %d %c\n",
1662 session->name, ip, port,
1664 session->session_id,
1665 tunnel->peer_tunnel_id,
1666 session->peer_session_id,
1668 (session == ps->sock->sk_user_data) ?
1670 seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n",
1671 session->mtu, session->mru,
1672 session->recv_seq ? 'R' : '-',
1673 session->send_seq ? 'S' : '-',
1674 session->lns_mode ? "LNS" : "LAC",
1676 jiffies_to_msecs(session->reorder_timeout));
1677 seq_printf(m, " %hu/%hu %ld/%ld/%ld %ld/%ld/%ld\n",
1678 session->nr, session->ns,
1679 atomic_long_read(&session->stats.tx_packets),
1680 atomic_long_read(&session->stats.tx_bytes),
1681 atomic_long_read(&session->stats.tx_errors),
1682 atomic_long_read(&session->stats.rx_packets),
1683 atomic_long_read(&session->stats.rx_bytes),
1684 atomic_long_read(&session->stats.rx_errors));
1687 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
1690 static int pppol2tp_seq_show(struct seq_file *m, void *v)
1692 struct pppol2tp_seq_data *pd = v;
1694 /* display header on line 1 */
1695 if (v == SEQ_START_TOKEN) {
1696 seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
1697 seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
1698 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1699 seq_puts(m, " SESSION name, addr/port src-tid/sid "
1700 "dest-tid/sid state user-data-ok\n");
1701 seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1702 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1706 /* Show the tunnel or session context.
1708 if (pd->session == NULL)
1709 pppol2tp_seq_tunnel_show(m, pd->tunnel);
1711 pppol2tp_seq_session_show(m, pd->session);
1717 static const struct seq_operations pppol2tp_seq_ops = {
1718 .start = pppol2tp_seq_start,
1719 .next = pppol2tp_seq_next,
1720 .stop = pppol2tp_seq_stop,
1721 .show = pppol2tp_seq_show,
1724 /* Called when our /proc file is opened. We allocate data for use when
1725 * iterating our tunnel / session contexts and store it in the private
1726 * data of the seq_file.
1728 static int pppol2tp_proc_open(struct inode *inode, struct file *file)
1730 return seq_open_net(inode, file, &pppol2tp_seq_ops,
1731 sizeof(struct pppol2tp_seq_data));
1734 static const struct file_operations pppol2tp_proc_fops = {
1735 .owner = THIS_MODULE,
1736 .open = pppol2tp_proc_open,
1738 .llseek = seq_lseek,
1739 .release = seq_release_net,
1742 #endif /* CONFIG_PROC_FS */
1744 /*****************************************************************************
1746 *****************************************************************************/
1748 static __net_init int pppol2tp_init_net(struct net *net)
1750 struct proc_dir_entry *pde;
1753 pde = proc_create("pppol2tp", S_IRUGO, net->proc_net,
1754 &pppol2tp_proc_fops);
1764 static __net_exit void pppol2tp_exit_net(struct net *net)
1766 remove_proc_entry("pppol2tp", net->proc_net);
1769 static struct pernet_operations pppol2tp_net_ops = {
1770 .init = pppol2tp_init_net,
1771 .exit = pppol2tp_exit_net,
1772 .id = &pppol2tp_net_id,
1775 /*****************************************************************************
1777 *****************************************************************************/
1779 static const struct proto_ops pppol2tp_ops = {
1781 .owner = THIS_MODULE,
1782 .release = pppol2tp_release,
1783 .bind = sock_no_bind,
1784 .connect = pppol2tp_connect,
1785 .socketpair = sock_no_socketpair,
1786 .accept = sock_no_accept,
1787 .getname = pppol2tp_getname,
1788 .poll = datagram_poll,
1789 .listen = sock_no_listen,
1790 .shutdown = sock_no_shutdown,
1791 .setsockopt = pppol2tp_setsockopt,
1792 .getsockopt = pppol2tp_getsockopt,
1793 .sendmsg = pppol2tp_sendmsg,
1794 .recvmsg = pppol2tp_recvmsg,
1795 .mmap = sock_no_mmap,
1796 .ioctl = pppox_ioctl,
1799 static const struct pppox_proto pppol2tp_proto = {
1800 .create = pppol2tp_create,
1801 .ioctl = pppol2tp_ioctl,
1802 .owner = THIS_MODULE,
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));