1 /*****************************************************************************
2 * Linux PPP over L2TP (PPPoX/PPPoL2TP) Sockets
4 * PPPoX --- Generic PPP encapsulation socket family
5 * PPPoL2TP --- PPP over L2TP (RFC 2661)
9 * Authors: James Chapman (jchapman@katalix.com)
11 * Based on original work by Martijn van Oosterhout <kleptog@svana.org>
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
21 /* This driver handles only L2TP data frames; control frames are handled by a
22 * userspace application.
24 * To send data in an L2TP session, userspace opens a PPPoL2TP socket and
25 * attaches it to a bound UDP socket with local tunnel_id / session_id and
26 * peer tunnel_id / session_id set. Data can then be sent or received using
27 * regular socket sendmsg() / recvmsg() calls. Kernel parameters of the socket
28 * can be read or modified using ioctl() or [gs]etsockopt() calls.
30 * When a PPPoL2TP socket is connected with local and peer session_id values
31 * zero, the socket is treated as a special tunnel management socket.
33 * Here's example userspace code to create a socket for sending/receiving data
34 * over an L2TP session:-
36 * struct sockaddr_pppol2tp sax;
40 * fd = socket(AF_PPPOX, SOCK_DGRAM, PX_PROTO_OL2TP);
42 * sax.sa_family = AF_PPPOX;
43 * sax.sa_protocol = PX_PROTO_OL2TP;
44 * sax.pppol2tp.fd = tunnel_fd; // bound UDP socket
45 * sax.pppol2tp.addr.sin_addr.s_addr = addr->sin_addr.s_addr;
46 * sax.pppol2tp.addr.sin_port = addr->sin_port;
47 * sax.pppol2tp.addr.sin_family = AF_INET;
48 * sax.pppol2tp.s_tunnel = tunnel_id;
49 * sax.pppol2tp.s_session = session_id;
50 * sax.pppol2tp.d_tunnel = peer_tunnel_id;
51 * sax.pppol2tp.d_session = peer_session_id;
53 * session_fd = connect(fd, (struct sockaddr *)&sax, sizeof(sax));
55 * A pppd plugin that allows PPP traffic to be carried over L2TP using
56 * this driver is available from the OpenL2TP project at
57 * http://openl2tp.sourceforge.net.
60 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
62 #include <linux/module.h>
63 #include <linux/string.h>
64 #include <linux/list.h>
65 #include <linux/uaccess.h>
67 #include <linux/kernel.h>
68 #include <linux/spinlock.h>
69 #include <linux/kthread.h>
70 #include <linux/sched.h>
71 #include <linux/slab.h>
72 #include <linux/errno.h>
73 #include <linux/jiffies.h>
75 #include <linux/netdevice.h>
76 #include <linux/net.h>
77 #include <linux/inetdevice.h>
78 #include <linux/skbuff.h>
79 #include <linux/init.h>
81 #include <linux/udp.h>
82 #include <linux/if_pppox.h>
83 #include <linux/if_pppol2tp.h>
85 #include <linux/ppp_channel.h>
86 #include <linux/ppp_defs.h>
87 #include <linux/ppp-ioctl.h>
88 #include <linux/file.h>
89 #include <linux/hash.h>
90 #include <linux/sort.h>
91 #include <linux/proc_fs.h>
92 #include <linux/l2tp.h>
93 #include <linux/nsproxy.h>
94 #include <net/net_namespace.h>
95 #include <net/netns/generic.h>
100 #include <net/inet_common.h>
102 #include <asm/byteorder.h>
103 #include <linux/atomic.h>
105 #include "l2tp_core.h"
107 #define PPPOL2TP_DRV_VERSION "V2.0"
109 /* Space for UDP, L2TP and PPP headers */
110 #define PPPOL2TP_HEADER_OVERHEAD 40
112 /* Number of bytes to build transmit L2TP headers.
113 * Unfortunately the size is different depending on whether sequence numbers
116 #define PPPOL2TP_L2TP_HDR_SIZE_SEQ 10
117 #define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ 6
119 /* Private data of each session. This data lives at the end of struct
120 * l2tp_session, referenced via session->priv[].
122 struct pppol2tp_session {
123 int owner; /* pid that opened the socket */
125 struct mutex sk_lock; /* Protects .sk */
126 struct sock __rcu *sk; /* Pointer to the session
128 struct sock *__sk; /* Copy of .sk, for cleanup */
129 struct rcu_head rcu; /* For asynchronous release */
130 struct sock *tunnel_sock; /* Pointer to the tunnel UDP
132 int flags; /* accessed by PPPIOCGFLAGS.
136 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb);
138 static const struct ppp_channel_ops pppol2tp_chan_ops = {
139 .start_xmit = pppol2tp_xmit,
142 static const struct proto_ops pppol2tp_ops;
144 /* Retrieves the pppol2tp socket associated to a session.
145 * A reference is held on the returned socket, so this function must be paired
148 static struct sock *pppol2tp_session_get_sock(struct l2tp_session *session)
150 struct pppol2tp_session *ps = l2tp_session_priv(session);
154 sk = rcu_dereference(ps->sk);
162 /* Helpers to obtain tunnel/session contexts from sockets.
164 static inline struct l2tp_session *pppol2tp_sock_to_session(struct sock *sk)
166 struct l2tp_session *session;
172 session = (struct l2tp_session *)(sk->sk_user_data);
173 if (session == NULL) {
178 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
184 /*****************************************************************************
185 * Receive data handling
186 *****************************************************************************/
188 static int pppol2tp_recv_payload_hook(struct sk_buff *skb)
190 /* Skip PPP header, if present. In testing, Microsoft L2TP clients
191 * don't send the PPP header (PPP header compression enabled), but
192 * other clients can include the header. So we cope with both cases
193 * here. The PPP header is always FF03 when using L2TP.
195 * Note that skb->data[] isn't dereferenced from a u16 ptr here since
196 * the field may be unaligned.
198 if (!pskb_may_pull(skb, 2))
201 if ((skb->data[0] == PPP_ALLSTATIONS) && (skb->data[1] == PPP_UI))
207 /* Receive message. This is the recvmsg for the PPPoL2TP socket.
209 static int pppol2tp_recvmsg(struct socket *sock, struct msghdr *msg,
210 size_t len, int flags)
214 struct sock *sk = sock->sk;
217 if (sk->sk_state & PPPOX_BOUND)
221 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
222 flags & MSG_DONTWAIT, &err);
228 else if (len < skb->len)
229 msg->msg_flags |= MSG_TRUNC;
231 err = skb_copy_datagram_msg(skb, 0, msg, len);
232 if (likely(err == 0))
240 static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
242 struct pppol2tp_session *ps = l2tp_session_priv(session);
243 struct sock *sk = NULL;
245 /* If the socket is bound, send it in to PPP's input queue. Otherwise
246 * queue it on the session socket.
249 sk = rcu_dereference(ps->sk);
253 if (sk->sk_state & PPPOX_BOUND) {
254 struct pppox_sock *po;
256 l2tp_dbg(session, L2TP_MSG_DATA,
257 "%s: recv %d byte data frame, passing to ppp\n",
258 session->name, data_len);
261 ppp_input(&po->chan, skb);
263 l2tp_dbg(session, L2TP_MSG_DATA,
264 "%s: recv %d byte data frame, passing to L2TP socket\n",
265 session->name, data_len);
267 if (sock_queue_rcv_skb(sk, skb) < 0) {
268 atomic_long_inc(&session->stats.rx_errors);
278 l2tp_info(session, L2TP_MSG_DATA, "%s: no socket\n", session->name);
282 /************************************************************************
284 ***********************************************************************/
286 /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here
287 * when a user application does a sendmsg() on the session socket. L2TP and
288 * PPP headers must be inserted into the user's data.
290 static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m,
293 struct sock *sk = sock->sk;
296 struct l2tp_session *session;
297 struct l2tp_tunnel *tunnel;
298 struct pppol2tp_session *ps;
302 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
305 /* Get session and tunnel contexts */
307 session = pppol2tp_sock_to_session(sk);
311 ps = l2tp_session_priv(session);
312 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
316 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
318 /* Allocate a socket buffer */
320 skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) +
321 uhlen + session->hdr_len +
322 2 + total_len, /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */
325 goto error_put_sess_tun;
327 /* Reserve space for headers. */
328 skb_reserve(skb, NET_SKB_PAD);
329 skb_reset_network_header(skb);
330 skb_reserve(skb, sizeof(struct iphdr));
331 skb_reset_transport_header(skb);
332 skb_reserve(skb, uhlen);
335 skb->data[0] = PPP_ALLSTATIONS;
336 skb->data[1] = PPP_UI;
339 /* Copy user data into skb */
340 error = memcpy_from_msg(skb_put(skb, total_len), m, total_len);
343 goto error_put_sess_tun;
347 l2tp_xmit_skb(session, skb, session->hdr_len);
350 sock_put(ps->tunnel_sock);
356 sock_put(ps->tunnel_sock);
363 /* Transmit function called by generic PPP driver. Sends PPP frame
364 * over PPPoL2TP socket.
366 * This is almost the same as pppol2tp_sendmsg(), but rather than
367 * being called with a msghdr from userspace, it is called with a skb
370 * The supplied skb from ppp doesn't have enough headroom for the
371 * insertion of L2TP, UDP and IP headers so we need to allocate more
372 * headroom in the skb. This will create a cloned skb. But we must be
373 * careful in the error case because the caller will expect to free
374 * the skb it supplied, not our cloned skb. So we take care to always
375 * leave the original skb unfreed if we return an error.
377 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
379 struct sock *sk = (struct sock *) chan->private;
381 struct l2tp_session *session;
382 struct l2tp_tunnel *tunnel;
383 struct pppol2tp_session *ps;
386 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
389 /* Get session and tunnel contexts from the socket */
390 session = pppol2tp_sock_to_session(sk);
394 ps = l2tp_session_priv(session);
395 sk_tun = ps->tunnel_sock;
398 tunnel = l2tp_sock_to_tunnel(sk_tun);
402 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
403 headroom = NET_SKB_PAD +
404 sizeof(struct iphdr) + /* IP header */
405 uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */
406 session->hdr_len + /* L2TP header */
407 2; /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */
408 if (skb_cow_head(skb, headroom))
409 goto abort_put_sess_tun;
411 /* Setup PPP header */
413 skb->data[0] = PPP_ALLSTATIONS;
414 skb->data[1] = PPP_UI;
417 l2tp_xmit_skb(session, skb, session->hdr_len);
429 /* Free the original skb */
434 /*****************************************************************************
435 * Session (and tunnel control) socket create/destroy.
436 *****************************************************************************/
438 /* Called by l2tp_core when a session socket is being closed.
440 static void pppol2tp_session_close(struct l2tp_session *session)
444 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
446 sk = pppol2tp_session_get_sock(session);
449 inet_shutdown(sk->sk_socket, SEND_SHUTDOWN);
454 /* Really kill the session socket. (Called from sock_put() if
457 static void pppol2tp_session_destruct(struct sock *sk)
459 struct l2tp_session *session = sk->sk_user_data;
461 skb_queue_purge(&sk->sk_receive_queue);
462 skb_queue_purge(&sk->sk_write_queue);
465 sk->sk_user_data = NULL;
466 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
467 l2tp_session_dec_refcount(session);
471 static void pppol2tp_put_sk(struct rcu_head *head)
473 struct pppol2tp_session *ps;
475 ps = container_of(head, typeof(*ps), rcu);
479 /* Called when the PPPoX socket (session) is closed.
481 static int pppol2tp_release(struct socket *sock)
483 struct sock *sk = sock->sk;
484 struct l2tp_session *session;
492 if (sock_flag(sk, SOCK_DEAD) != 0)
495 pppox_unbind_sock(sk);
497 /* Signal the death of the socket. */
498 sk->sk_state = PPPOX_DEAD;
502 session = pppol2tp_sock_to_session(sk);
504 if (session != NULL) {
505 struct pppol2tp_session *ps;
507 l2tp_session_delete(session);
509 ps = l2tp_session_priv(session);
510 mutex_lock(&ps->sk_lock);
511 ps->__sk = rcu_dereference_protected(ps->sk,
512 lockdep_is_held(&ps->sk_lock));
513 RCU_INIT_POINTER(ps->sk, NULL);
514 mutex_unlock(&ps->sk_lock);
515 call_rcu(&ps->rcu, pppol2tp_put_sk);
517 /* Rely on the sock_put() call at the end of the function for
518 * dropping the reference held by pppol2tp_sock_to_session().
519 * The last reference will be dropped by pppol2tp_put_sk().
524 /* This will delete the session context via
525 * pppol2tp_session_destruct() if the socket's refcnt drops to
537 static struct proto pppol2tp_sk_proto = {
539 .owner = THIS_MODULE,
540 .obj_size = sizeof(struct pppox_sock),
543 static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb)
547 rc = l2tp_udp_encap_recv(sk, skb);
551 return NET_RX_SUCCESS;
554 /* socket() handler. Initialize a new struct sock.
556 static int pppol2tp_create(struct net *net, struct socket *sock, int kern)
561 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto, kern);
565 sock_init_data(sock, sk);
567 sock->state = SS_UNCONNECTED;
568 sock->ops = &pppol2tp_ops;
570 sk->sk_backlog_rcv = pppol2tp_backlog_recv;
571 sk->sk_protocol = PX_PROTO_OL2TP;
572 sk->sk_family = PF_PPPOX;
573 sk->sk_state = PPPOX_NONE;
574 sk->sk_type = SOCK_STREAM;
575 sk->sk_destruct = pppol2tp_session_destruct;
583 #if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
584 static void pppol2tp_show(struct seq_file *m, void *arg)
586 struct l2tp_session *session = arg;
589 sk = pppol2tp_session_get_sock(session);
591 struct pppox_sock *po = pppox_sk(sk);
593 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
599 static void pppol2tp_session_init(struct l2tp_session *session)
601 struct pppol2tp_session *ps;
602 struct dst_entry *dst;
604 session->recv_skb = pppol2tp_recv;
605 session->session_close = pppol2tp_session_close;
606 #if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
607 session->show = pppol2tp_show;
610 ps = l2tp_session_priv(session);
611 mutex_init(&ps->sk_lock);
612 ps->tunnel_sock = session->tunnel->sock;
613 ps->owner = current->pid;
615 /* If PMTU discovery was enabled, use the MTU that was discovered */
616 dst = sk_dst_get(session->tunnel->sock);
618 u32 pmtu = dst_mtu(dst);
621 session->mtu = pmtu - PPPOL2TP_HEADER_OVERHEAD;
622 session->mru = pmtu - PPPOL2TP_HEADER_OVERHEAD;
628 /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
630 static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
631 int sockaddr_len, int flags)
633 struct sock *sk = sock->sk;
634 struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr;
635 struct pppox_sock *po = pppox_sk(sk);
636 struct l2tp_session *session = NULL;
637 struct l2tp_tunnel *tunnel;
638 struct pppol2tp_session *ps;
639 struct l2tp_session_cfg cfg = { 0, };
641 u32 tunnel_id, peer_tunnel_id;
642 u32 session_id, peer_session_id;
643 bool drop_refcnt = false;
644 bool drop_tunnel = false;
652 if (sockaddr_len != sizeof(struct sockaddr_pppol2tp) &&
653 sockaddr_len != sizeof(struct sockaddr_pppol2tpv3) &&
654 sockaddr_len != sizeof(struct sockaddr_pppol2tpin6) &&
655 sockaddr_len != sizeof(struct sockaddr_pppol2tpv3in6))
658 if (sp->sa_protocol != PX_PROTO_OL2TP)
661 /* Check for already bound sockets */
663 if (sk->sk_state & PPPOX_CONNECTED)
666 /* We don't supporting rebinding anyway */
668 if (sk->sk_user_data)
669 goto end; /* socket is already attached */
671 /* Get params from socket address. Handle L2TPv2 and L2TPv3.
672 * This is nasty because there are different sockaddr_pppol2tp
673 * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use
674 * the sockaddr size to determine which structure the caller
678 if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) {
679 fd = sp->pppol2tp.fd;
680 tunnel_id = sp->pppol2tp.s_tunnel;
681 peer_tunnel_id = sp->pppol2tp.d_tunnel;
682 session_id = sp->pppol2tp.s_session;
683 peer_session_id = sp->pppol2tp.d_session;
684 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) {
685 struct sockaddr_pppol2tpv3 *sp3 =
686 (struct sockaddr_pppol2tpv3 *) sp;
688 fd = sp3->pppol2tp.fd;
689 tunnel_id = sp3->pppol2tp.s_tunnel;
690 peer_tunnel_id = sp3->pppol2tp.d_tunnel;
691 session_id = sp3->pppol2tp.s_session;
692 peer_session_id = sp3->pppol2tp.d_session;
693 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpin6)) {
694 struct sockaddr_pppol2tpin6 *sp6 =
695 (struct sockaddr_pppol2tpin6 *) sp;
696 fd = sp6->pppol2tp.fd;
697 tunnel_id = sp6->pppol2tp.s_tunnel;
698 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
699 session_id = sp6->pppol2tp.s_session;
700 peer_session_id = sp6->pppol2tp.d_session;
701 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3in6)) {
702 struct sockaddr_pppol2tpv3in6 *sp6 =
703 (struct sockaddr_pppol2tpv3in6 *) sp;
705 fd = sp6->pppol2tp.fd;
706 tunnel_id = sp6->pppol2tp.s_tunnel;
707 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
708 session_id = sp6->pppol2tp.s_session;
709 peer_session_id = sp6->pppol2tp.d_session;
712 goto end; /* bad socket address */
715 /* Don't bind if tunnel_id is 0 */
720 tunnel = l2tp_tunnel_get(sock_net(sk), tunnel_id);
724 /* Special case: create tunnel context if session_id and
725 * peer_session_id is 0. Otherwise look up tunnel using supplied
728 if ((session_id == 0) && (peer_session_id == 0)) {
729 if (tunnel == NULL) {
730 struct l2tp_tunnel_cfg tcfg = {
731 .encap = L2TP_ENCAPTYPE_UDP,
734 error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel);
739 /* Error if we can't find the tunnel */
744 /* Error if socket is not prepped */
745 if (tunnel->sock == NULL)
749 if (tunnel->recv_payload_hook == NULL)
750 tunnel->recv_payload_hook = pppol2tp_recv_payload_hook;
752 if (tunnel->peer_tunnel_id == 0)
753 tunnel->peer_tunnel_id = peer_tunnel_id;
755 session = l2tp_session_get(sock_net(sk), tunnel, session_id, false);
758 ps = l2tp_session_priv(session);
760 /* Using a pre-existing session is fine as long as it hasn't
761 * been connected yet.
763 mutex_lock(&ps->sk_lock);
764 if (rcu_dereference_protected(ps->sk,
765 lockdep_is_held(&ps->sk_lock))) {
766 mutex_unlock(&ps->sk_lock);
771 /* consistency checks */
772 if (ps->tunnel_sock != tunnel->sock) {
773 mutex_unlock(&ps->sk_lock);
778 /* Default MTU must allow space for UDP/L2TP/PPP headers */
779 cfg.mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
782 session = l2tp_session_create(sizeof(struct pppol2tp_session),
784 peer_session_id, &cfg);
785 if (IS_ERR(session)) {
786 error = PTR_ERR(session);
790 pppol2tp_session_init(session);
791 ps = l2tp_session_priv(session);
792 l2tp_session_inc_refcount(session);
794 mutex_lock(&ps->sk_lock);
795 error = l2tp_session_register(session, tunnel);
797 mutex_unlock(&ps->sk_lock);
804 /* Special case: if source & dest session_id == 0x0000, this
805 * socket is being created to manage the tunnel. Just set up
806 * the internal context for use by ioctl() and sockopt()
809 if ((session->session_id == 0) &&
810 (session->peer_session_id == 0)) {
815 /* The only header we need to worry about is the L2TP
816 * header. This size is different depending on whether
817 * sequence numbers are enabled for the data channel.
819 po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
821 po->chan.private = sk;
822 po->chan.ops = &pppol2tp_chan_ops;
823 po->chan.mtu = session->mtu;
825 error = ppp_register_net_channel(sock_net(sk), &po->chan);
827 mutex_unlock(&ps->sk_lock);
832 /* This is how we get the session context from the socket. */
833 sk->sk_user_data = session;
834 rcu_assign_pointer(ps->sk, sk);
835 mutex_unlock(&ps->sk_lock);
837 /* Keep the reference we've grabbed on the session: sk doesn't expect
838 * the session to disappear. pppol2tp_session_destruct() is responsible
843 sk->sk_state = PPPOX_CONNECTED;
844 l2tp_info(session, L2TP_MSG_CONTROL, "%s: created\n",
849 l2tp_session_dec_refcount(session);
851 l2tp_tunnel_dec_refcount(tunnel);
857 #ifdef CONFIG_L2TP_V3
859 /* Called when creating sessions via the netlink interface. */
860 static int pppol2tp_session_create(struct net *net, struct l2tp_tunnel *tunnel,
861 u32 session_id, u32 peer_session_id,
862 struct l2tp_session_cfg *cfg)
865 struct l2tp_session *session;
867 /* Error if tunnel socket is not prepped */
873 /* Default MTU values. */
875 cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
879 /* Allocate and initialize a new session context. */
880 session = l2tp_session_create(sizeof(struct pppol2tp_session),
882 peer_session_id, cfg);
883 if (IS_ERR(session)) {
884 error = PTR_ERR(session);
888 pppol2tp_session_init(session);
890 error = l2tp_session_register(session, tunnel);
902 #endif /* CONFIG_L2TP_V3 */
904 /* getname() support.
906 static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
907 int *usockaddr_len, int peer)
911 struct l2tp_session *session;
912 struct l2tp_tunnel *tunnel;
913 struct sock *sk = sock->sk;
914 struct inet_sock *inet;
915 struct pppol2tp_session *pls;
920 if (!(sk->sk_state & PPPOX_CONNECTED))
924 session = pppol2tp_sock_to_session(sk);
928 pls = l2tp_session_priv(session);
929 tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock);
933 inet = inet_sk(tunnel->sock);
934 if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) {
935 struct sockaddr_pppol2tp 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.sin_family = AF_INET;
947 sp.pppol2tp.addr.sin_port = inet->inet_dport;
948 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
949 memcpy(uaddr, &sp, len);
950 #if IS_ENABLED(CONFIG_IPV6)
951 } else if ((tunnel->version == 2) &&
952 (tunnel->sock->sk_family == AF_INET6)) {
953 struct sockaddr_pppol2tpin6 sp;
957 sp.sa_family = AF_PPPOX;
958 sp.sa_protocol = PX_PROTO_OL2TP;
959 sp.pppol2tp.fd = tunnel->fd;
960 sp.pppol2tp.pid = pls->owner;
961 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
962 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
963 sp.pppol2tp.s_session = session->session_id;
964 sp.pppol2tp.d_session = session->peer_session_id;
965 sp.pppol2tp.addr.sin6_family = AF_INET6;
966 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
967 memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
968 sizeof(tunnel->sock->sk_v6_daddr));
969 memcpy(uaddr, &sp, len);
970 } else if ((tunnel->version == 3) &&
971 (tunnel->sock->sk_family == AF_INET6)) {
972 struct sockaddr_pppol2tpv3in6 sp;
976 sp.sa_family = AF_PPPOX;
977 sp.sa_protocol = PX_PROTO_OL2TP;
978 sp.pppol2tp.fd = tunnel->fd;
979 sp.pppol2tp.pid = pls->owner;
980 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
981 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
982 sp.pppol2tp.s_session = session->session_id;
983 sp.pppol2tp.d_session = session->peer_session_id;
984 sp.pppol2tp.addr.sin6_family = AF_INET6;
985 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
986 memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
987 sizeof(tunnel->sock->sk_v6_daddr));
988 memcpy(uaddr, &sp, len);
990 } else if (tunnel->version == 3) {
991 struct sockaddr_pppol2tpv3 sp;
994 sp.sa_family = AF_PPPOX;
995 sp.sa_protocol = PX_PROTO_OL2TP;
996 sp.pppol2tp.fd = tunnel->fd;
997 sp.pppol2tp.pid = pls->owner;
998 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
999 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
1000 sp.pppol2tp.s_session = session->session_id;
1001 sp.pppol2tp.d_session = session->peer_session_id;
1002 sp.pppol2tp.addr.sin_family = AF_INET;
1003 sp.pppol2tp.addr.sin_port = inet->inet_dport;
1004 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
1005 memcpy(uaddr, &sp, len);
1008 *usockaddr_len = len;
1011 sock_put(pls->tunnel_sock);
1018 /****************************************************************************
1021 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1022 * sockets. However, in order to control kernel tunnel features, we allow
1023 * userspace to create a special "tunnel" PPPoX socket which is used for
1024 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
1025 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
1027 ****************************************************************************/
1029 static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest,
1030 struct l2tp_stats *stats)
1032 dest->tx_packets = atomic_long_read(&stats->tx_packets);
1033 dest->tx_bytes = atomic_long_read(&stats->tx_bytes);
1034 dest->tx_errors = atomic_long_read(&stats->tx_errors);
1035 dest->rx_packets = atomic_long_read(&stats->rx_packets);
1036 dest->rx_bytes = atomic_long_read(&stats->rx_bytes);
1037 dest->rx_seq_discards = atomic_long_read(&stats->rx_seq_discards);
1038 dest->rx_oos_packets = atomic_long_read(&stats->rx_oos_packets);
1039 dest->rx_errors = atomic_long_read(&stats->rx_errors);
1042 /* Session ioctl helper.
1044 static int pppol2tp_session_ioctl(struct l2tp_session *session,
1045 unsigned int cmd, unsigned long arg)
1050 int val = (int) arg;
1051 struct pppol2tp_session *ps = l2tp_session_priv(session);
1052 struct l2tp_tunnel *tunnel = session->tunnel;
1053 struct pppol2tp_ioc_stats stats;
1055 l2tp_dbg(session, L2TP_MSG_CONTROL,
1056 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
1057 session->name, cmd, arg);
1059 sk = pppol2tp_session_get_sock(session);
1066 if (!(sk->sk_state & PPPOX_CONNECTED))
1070 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1072 ifr.ifr_mtu = session->mtu;
1073 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
1076 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mtu=%d\n",
1077 session->name, session->mtu);
1083 if (!(sk->sk_state & PPPOX_CONNECTED))
1087 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1090 session->mtu = ifr.ifr_mtu;
1092 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mtu=%d\n",
1093 session->name, session->mtu);
1099 if (!(sk->sk_state & PPPOX_CONNECTED))
1103 if (put_user(session->mru, (int __user *) arg))
1106 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mru=%d\n",
1107 session->name, session->mru);
1113 if (!(sk->sk_state & PPPOX_CONNECTED))
1117 if (get_user(val, (int __user *) arg))
1121 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mru=%d\n",
1122 session->name, session->mru);
1128 if (put_user(ps->flags, (int __user *) arg))
1131 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get flags=%d\n",
1132 session->name, ps->flags);
1138 if (get_user(val, (int __user *) arg))
1141 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set flags=%d\n",
1142 session->name, ps->flags);
1146 case PPPIOCGL2TPSTATS:
1148 if (!(sk->sk_state & PPPOX_CONNECTED))
1151 memset(&stats, 0, sizeof(stats));
1152 stats.tunnel_id = tunnel->tunnel_id;
1153 stats.session_id = session->session_id;
1154 pppol2tp_copy_stats(&stats, &session->stats);
1155 if (copy_to_user((void __user *) arg, &stats,
1158 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1173 /* Tunnel ioctl helper.
1175 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1176 * specifies a session_id, the session ioctl handler is called. This allows an
1177 * application to retrieve session stats via a tunnel socket.
1179 static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
1180 unsigned int cmd, unsigned long arg)
1184 struct pppol2tp_ioc_stats stats;
1186 l2tp_dbg(tunnel, L2TP_MSG_CONTROL,
1187 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1188 tunnel->name, cmd, arg);
1194 case PPPIOCGL2TPSTATS:
1196 if (!(sk->sk_state & PPPOX_CONNECTED))
1199 if (copy_from_user(&stats, (void __user *) arg,
1204 if (stats.session_id != 0) {
1205 /* resend to session ioctl handler */
1206 struct l2tp_session *session =
1207 l2tp_session_get(sock_net(sk), tunnel,
1208 stats.session_id, true);
1211 err = pppol2tp_session_ioctl(session, cmd,
1214 session->deref(session);
1215 l2tp_session_dec_refcount(session);
1222 stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
1224 pppol2tp_copy_stats(&stats, &tunnel->stats);
1225 if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) {
1229 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1244 /* Main ioctl() handler.
1245 * Dispatch to tunnel or session helpers depending on the socket.
1247 static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
1250 struct sock *sk = sock->sk;
1251 struct l2tp_session *session;
1252 struct l2tp_tunnel *tunnel;
1253 struct pppol2tp_session *ps;
1260 if (sock_flag(sk, SOCK_DEAD) != 0)
1264 if ((sk->sk_user_data == NULL) ||
1265 (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
1268 /* Get session context from the socket */
1270 session = pppol2tp_sock_to_session(sk);
1271 if (session == NULL)
1274 /* Special case: if session's session_id is zero, treat ioctl as a
1277 ps = l2tp_session_priv(session);
1278 if ((session->session_id == 0) &&
1279 (session->peer_session_id == 0)) {
1281 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1285 err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
1286 sock_put(ps->tunnel_sock);
1290 err = pppol2tp_session_ioctl(session, cmd, arg);
1298 /*****************************************************************************
1299 * setsockopt() / getsockopt() support.
1301 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1302 * sockets. In order to control kernel tunnel features, we allow userspace to
1303 * create a special "tunnel" PPPoX socket which is used for control only.
1304 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1305 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1306 *****************************************************************************/
1308 /* Tunnel setsockopt() helper.
1310 static int pppol2tp_tunnel_setsockopt(struct sock *sk,
1311 struct l2tp_tunnel *tunnel,
1312 int optname, int val)
1317 case PPPOL2TP_SO_DEBUG:
1318 tunnel->debug = val;
1319 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: set debug=%x\n",
1320 tunnel->name, tunnel->debug);
1331 /* Session setsockopt helper.
1333 static int pppol2tp_session_setsockopt(struct sock *sk,
1334 struct l2tp_session *session,
1335 int optname, int val)
1340 case PPPOL2TP_SO_RECVSEQ:
1341 if ((val != 0) && (val != 1)) {
1345 session->recv_seq = !!val;
1346 l2tp_info(session, L2TP_MSG_CONTROL,
1347 "%s: set recv_seq=%d\n",
1348 session->name, session->recv_seq);
1351 case PPPOL2TP_SO_SENDSEQ:
1352 if ((val != 0) && (val != 1)) {
1356 session->send_seq = !!val;
1358 struct pppox_sock *po = pppox_sk(sk);
1360 po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
1361 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1363 l2tp_session_set_header_len(session, session->tunnel->version);
1364 l2tp_info(session, L2TP_MSG_CONTROL,
1365 "%s: set send_seq=%d\n",
1366 session->name, session->send_seq);
1369 case PPPOL2TP_SO_LNSMODE:
1370 if ((val != 0) && (val != 1)) {
1374 session->lns_mode = !!val;
1375 l2tp_info(session, L2TP_MSG_CONTROL,
1376 "%s: set lns_mode=%d\n",
1377 session->name, session->lns_mode);
1380 case PPPOL2TP_SO_DEBUG:
1381 session->debug = val;
1382 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set debug=%x\n",
1383 session->name, session->debug);
1386 case PPPOL2TP_SO_REORDERTO:
1387 session->reorder_timeout = msecs_to_jiffies(val);
1388 l2tp_info(session, L2TP_MSG_CONTROL,
1389 "%s: set reorder_timeout=%d\n",
1390 session->name, session->reorder_timeout);
1401 /* Main setsockopt() entry point.
1402 * Does API checks, then calls either the tunnel or session setsockopt
1403 * handler, according to whether the PPPoL2TP socket is a for a regular
1404 * session or the special tunnel type.
1406 static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
1407 char __user *optval, unsigned int optlen)
1409 struct sock *sk = sock->sk;
1410 struct l2tp_session *session;
1411 struct l2tp_tunnel *tunnel;
1412 struct pppol2tp_session *ps;
1416 if (level != SOL_PPPOL2TP)
1419 if (optlen < sizeof(int))
1422 if (get_user(val, (int __user *)optval))
1426 if (sk->sk_user_data == NULL)
1429 /* Get session context from the socket */
1431 session = pppol2tp_sock_to_session(sk);
1432 if (session == NULL)
1435 /* Special case: if session_id == 0x0000, treat as operation on tunnel
1437 ps = l2tp_session_priv(session);
1438 if ((session->session_id == 0) &&
1439 (session->peer_session_id == 0)) {
1441 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1445 err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
1446 sock_put(ps->tunnel_sock);
1448 err = pppol2tp_session_setsockopt(sk, session, optname, val);
1456 /* Tunnel getsockopt helper. Called with sock locked.
1458 static int pppol2tp_tunnel_getsockopt(struct sock *sk,
1459 struct l2tp_tunnel *tunnel,
1460 int optname, int *val)
1465 case PPPOL2TP_SO_DEBUG:
1466 *val = tunnel->debug;
1467 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get debug=%x\n",
1468 tunnel->name, tunnel->debug);
1479 /* Session getsockopt helper. Called with sock locked.
1481 static int pppol2tp_session_getsockopt(struct sock *sk,
1482 struct l2tp_session *session,
1483 int optname, int *val)
1488 case PPPOL2TP_SO_RECVSEQ:
1489 *val = session->recv_seq;
1490 l2tp_info(session, L2TP_MSG_CONTROL,
1491 "%s: get recv_seq=%d\n", session->name, *val);
1494 case PPPOL2TP_SO_SENDSEQ:
1495 *val = session->send_seq;
1496 l2tp_info(session, L2TP_MSG_CONTROL,
1497 "%s: get send_seq=%d\n", session->name, *val);
1500 case PPPOL2TP_SO_LNSMODE:
1501 *val = session->lns_mode;
1502 l2tp_info(session, L2TP_MSG_CONTROL,
1503 "%s: get lns_mode=%d\n", session->name, *val);
1506 case PPPOL2TP_SO_DEBUG:
1507 *val = session->debug;
1508 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get debug=%d\n",
1509 session->name, *val);
1512 case PPPOL2TP_SO_REORDERTO:
1513 *val = (int) jiffies_to_msecs(session->reorder_timeout);
1514 l2tp_info(session, L2TP_MSG_CONTROL,
1515 "%s: get reorder_timeout=%d\n", session->name, *val);
1525 /* Main getsockopt() entry point.
1526 * Does API checks, then calls either the tunnel or session getsockopt
1527 * handler, according to whether the PPPoX socket is a for a regular session
1528 * or the special tunnel type.
1530 static int pppol2tp_getsockopt(struct socket *sock, int level, int optname,
1531 char __user *optval, int __user *optlen)
1533 struct sock *sk = sock->sk;
1534 struct l2tp_session *session;
1535 struct l2tp_tunnel *tunnel;
1538 struct pppol2tp_session *ps;
1540 if (level != SOL_PPPOL2TP)
1543 if (get_user(len, optlen))
1546 len = min_t(unsigned int, len, sizeof(int));
1552 if (sk->sk_user_data == NULL)
1555 /* Get the session context */
1557 session = pppol2tp_sock_to_session(sk);
1558 if (session == NULL)
1561 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1562 ps = l2tp_session_priv(session);
1563 if ((session->session_id == 0) &&
1564 (session->peer_session_id == 0)) {
1566 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1570 err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
1571 sock_put(ps->tunnel_sock);
1575 err = pppol2tp_session_getsockopt(sk, session, optname, &val);
1581 if (put_user(len, optlen))
1584 if (copy_to_user((void __user *) optval, &val, len))
1595 /*****************************************************************************
1596 * /proc filesystem for debug
1597 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1598 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1599 *****************************************************************************/
1601 static unsigned int pppol2tp_net_id;
1603 #ifdef CONFIG_PROC_FS
1605 struct pppol2tp_seq_data {
1606 struct seq_net_private p;
1607 int tunnel_idx; /* current tunnel */
1608 int session_idx; /* index of session within current tunnel */
1609 struct l2tp_tunnel *tunnel;
1610 struct l2tp_session *session; /* NULL means get next tunnel */
1613 static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
1616 pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx);
1619 if (pd->tunnel == NULL)
1622 /* Ignore L2TPv3 tunnels */
1623 if (pd->tunnel->version < 3)
1628 static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
1630 pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx, true);
1633 if (pd->session == NULL) {
1634 pd->session_idx = 0;
1635 pppol2tp_next_tunnel(net, pd);
1639 static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
1641 struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
1648 BUG_ON(m->private == NULL);
1650 net = seq_file_net(m);
1652 if (pd->tunnel == NULL)
1653 pppol2tp_next_tunnel(net, pd);
1655 pppol2tp_next_session(net, pd);
1657 /* NULL tunnel and session indicates end of list */
1658 if ((pd->tunnel == NULL) && (pd->session == NULL))
1665 static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
1671 static void pppol2tp_seq_stop(struct seq_file *p, void *v)
1676 static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
1678 struct l2tp_tunnel *tunnel = v;
1680 seq_printf(m, "\nTUNNEL '%s', %c %d\n",
1682 (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
1683 refcount_read(&tunnel->ref_count) - 1);
1684 seq_printf(m, " %08x %ld/%ld/%ld %ld/%ld/%ld\n",
1686 atomic_long_read(&tunnel->stats.tx_packets),
1687 atomic_long_read(&tunnel->stats.tx_bytes),
1688 atomic_long_read(&tunnel->stats.tx_errors),
1689 atomic_long_read(&tunnel->stats.rx_packets),
1690 atomic_long_read(&tunnel->stats.rx_bytes),
1691 atomic_long_read(&tunnel->stats.rx_errors));
1694 static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
1696 struct l2tp_session *session = v;
1697 struct l2tp_tunnel *tunnel = session->tunnel;
1698 unsigned char state;
1705 struct inet_sock *inet = inet_sk(tunnel->sock);
1706 ip = ntohl(inet->inet_saddr);
1707 port = ntohs(inet->inet_sport);
1710 sk = pppol2tp_session_get_sock(session);
1712 state = sk->sk_state;
1713 user_data_ok = (session == sk->sk_user_data) ? 'Y' : 'N';
1719 seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
1720 "%04X/%04X %d %c\n",
1721 session->name, ip, port,
1723 session->session_id,
1724 tunnel->peer_tunnel_id,
1725 session->peer_session_id,
1726 state, user_data_ok);
1727 seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n",
1728 session->mtu, session->mru,
1729 session->recv_seq ? 'R' : '-',
1730 session->send_seq ? 'S' : '-',
1731 session->lns_mode ? "LNS" : "LAC",
1733 jiffies_to_msecs(session->reorder_timeout));
1734 seq_printf(m, " %hu/%hu %ld/%ld/%ld %ld/%ld/%ld\n",
1735 session->nr, session->ns,
1736 atomic_long_read(&session->stats.tx_packets),
1737 atomic_long_read(&session->stats.tx_bytes),
1738 atomic_long_read(&session->stats.tx_errors),
1739 atomic_long_read(&session->stats.rx_packets),
1740 atomic_long_read(&session->stats.rx_bytes),
1741 atomic_long_read(&session->stats.rx_errors));
1744 struct pppox_sock *po = pppox_sk(sk);
1746 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
1751 static int pppol2tp_seq_show(struct seq_file *m, void *v)
1753 struct pppol2tp_seq_data *pd = v;
1755 /* display header on line 1 */
1756 if (v == SEQ_START_TOKEN) {
1757 seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
1758 seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
1759 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1760 seq_puts(m, " SESSION name, addr/port src-tid/sid "
1761 "dest-tid/sid state user-data-ok\n");
1762 seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1763 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1767 /* Show the tunnel or session context.
1770 pppol2tp_seq_tunnel_show(m, pd->tunnel);
1772 pppol2tp_seq_session_show(m, pd->session);
1773 if (pd->session->deref)
1774 pd->session->deref(pd->session);
1775 l2tp_session_dec_refcount(pd->session);
1782 static const struct seq_operations pppol2tp_seq_ops = {
1783 .start = pppol2tp_seq_start,
1784 .next = pppol2tp_seq_next,
1785 .stop = pppol2tp_seq_stop,
1786 .show = pppol2tp_seq_show,
1789 /* Called when our /proc file is opened. We allocate data for use when
1790 * iterating our tunnel / session contexts and store it in the private
1791 * data of the seq_file.
1793 static int pppol2tp_proc_open(struct inode *inode, struct file *file)
1795 return seq_open_net(inode, file, &pppol2tp_seq_ops,
1796 sizeof(struct pppol2tp_seq_data));
1799 static const struct file_operations pppol2tp_proc_fops = {
1800 .owner = THIS_MODULE,
1801 .open = pppol2tp_proc_open,
1803 .llseek = seq_lseek,
1804 .release = seq_release_net,
1807 #endif /* CONFIG_PROC_FS */
1809 /*****************************************************************************
1811 *****************************************************************************/
1813 static __net_init int pppol2tp_init_net(struct net *net)
1815 struct proc_dir_entry *pde;
1818 pde = proc_create("pppol2tp", S_IRUGO, net->proc_net,
1819 &pppol2tp_proc_fops);
1829 static __net_exit void pppol2tp_exit_net(struct net *net)
1831 remove_proc_entry("pppol2tp", net->proc_net);
1834 static struct pernet_operations pppol2tp_net_ops = {
1835 .init = pppol2tp_init_net,
1836 .exit = pppol2tp_exit_net,
1837 .id = &pppol2tp_net_id,
1840 /*****************************************************************************
1842 *****************************************************************************/
1844 static const struct proto_ops pppol2tp_ops = {
1846 .owner = THIS_MODULE,
1847 .release = pppol2tp_release,
1848 .bind = sock_no_bind,
1849 .connect = pppol2tp_connect,
1850 .socketpair = sock_no_socketpair,
1851 .accept = sock_no_accept,
1852 .getname = pppol2tp_getname,
1853 .poll = datagram_poll,
1854 .listen = sock_no_listen,
1855 .shutdown = sock_no_shutdown,
1856 .setsockopt = pppol2tp_setsockopt,
1857 .getsockopt = pppol2tp_getsockopt,
1858 .sendmsg = pppol2tp_sendmsg,
1859 .recvmsg = pppol2tp_recvmsg,
1860 .mmap = sock_no_mmap,
1861 .ioctl = pppox_ioctl,
1862 #ifdef CONFIG_COMPAT
1863 .compat_ioctl = pppox_compat_ioctl,
1867 static const struct pppox_proto pppol2tp_proto = {
1868 .create = pppol2tp_create,
1869 .ioctl = pppol2tp_ioctl,
1870 .owner = THIS_MODULE,
1873 #ifdef CONFIG_L2TP_V3
1875 static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = {
1876 .session_create = pppol2tp_session_create,
1877 .session_delete = l2tp_session_delete,
1880 #endif /* CONFIG_L2TP_V3 */
1882 static int __init pppol2tp_init(void)
1886 err = register_pernet_device(&pppol2tp_net_ops);
1890 err = proto_register(&pppol2tp_sk_proto, 0);
1892 goto out_unregister_pppol2tp_pernet;
1894 err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
1896 goto out_unregister_pppol2tp_proto;
1898 #ifdef CONFIG_L2TP_V3
1899 err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops);
1901 goto out_unregister_pppox;
1904 pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION);
1909 #ifdef CONFIG_L2TP_V3
1910 out_unregister_pppox:
1911 unregister_pppox_proto(PX_PROTO_OL2TP);
1913 out_unregister_pppol2tp_proto:
1914 proto_unregister(&pppol2tp_sk_proto);
1915 out_unregister_pppol2tp_pernet:
1916 unregister_pernet_device(&pppol2tp_net_ops);
1920 static void __exit pppol2tp_exit(void)
1922 #ifdef CONFIG_L2TP_V3
1923 l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP);
1925 unregister_pppox_proto(PX_PROTO_OL2TP);
1926 proto_unregister(&pppol2tp_sk_proto);
1927 unregister_pernet_device(&pppol2tp_net_ops);
1930 module_init(pppol2tp_init);
1931 module_exit(pppol2tp_exit);
1933 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1934 MODULE_DESCRIPTION("PPP over L2TP over UDP");
1935 MODULE_LICENSE("GPL");
1936 MODULE_VERSION(PPPOL2TP_DRV_VERSION);
1937 MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_OL2TP);
1938 MODULE_ALIAS_L2TP_PWTYPE(7);