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 static void pppol2tp_put_sk(struct rcu_head *head)
440 struct pppol2tp_session *ps;
442 ps = container_of(head, typeof(*ps), rcu);
446 /* Called by l2tp_core when a session socket is being closed.
448 static void pppol2tp_session_close(struct l2tp_session *session)
450 struct pppol2tp_session *ps;
452 ps = l2tp_session_priv(session);
453 mutex_lock(&ps->sk_lock);
454 ps->__sk = rcu_dereference_protected(ps->sk,
455 lockdep_is_held(&ps->sk_lock));
456 RCU_INIT_POINTER(ps->sk, NULL);
458 call_rcu(&ps->rcu, pppol2tp_put_sk);
459 mutex_unlock(&ps->sk_lock);
462 /* Really kill the session socket. (Called from sock_put() if
465 static void pppol2tp_session_destruct(struct sock *sk)
467 struct l2tp_session *session = sk->sk_user_data;
469 skb_queue_purge(&sk->sk_receive_queue);
470 skb_queue_purge(&sk->sk_write_queue);
473 sk->sk_user_data = NULL;
474 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
475 l2tp_session_dec_refcount(session);
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 /* If the socket is associated with a session,
503 * l2tp_session_delete will call pppol2tp_session_close which
504 * will drop the session's ref on the socket.
506 session = pppol2tp_sock_to_session(sk);
508 l2tp_session_delete(session);
509 /* drop the ref obtained by pppol2tp_sock_to_session */
515 /* This will delete the session context via
516 * pppol2tp_session_destruct() if the socket's refcnt drops to
528 static struct proto pppol2tp_sk_proto = {
530 .owner = THIS_MODULE,
531 .obj_size = sizeof(struct pppox_sock),
534 static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb)
538 rc = l2tp_udp_encap_recv(sk, skb);
542 return NET_RX_SUCCESS;
545 /* socket() handler. Initialize a new struct sock.
547 static int pppol2tp_create(struct net *net, struct socket *sock, int kern)
552 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto, kern);
556 sock_init_data(sock, sk);
558 sock->state = SS_UNCONNECTED;
559 sock->ops = &pppol2tp_ops;
561 sk->sk_backlog_rcv = pppol2tp_backlog_recv;
562 sk->sk_protocol = PX_PROTO_OL2TP;
563 sk->sk_family = PF_PPPOX;
564 sk->sk_state = PPPOX_NONE;
565 sk->sk_type = SOCK_STREAM;
566 sk->sk_destruct = pppol2tp_session_destruct;
574 #if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
575 static void pppol2tp_show(struct seq_file *m, void *arg)
577 struct l2tp_session *session = arg;
580 sk = pppol2tp_session_get_sock(session);
582 struct pppox_sock *po = pppox_sk(sk);
584 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
590 static void pppol2tp_session_init(struct l2tp_session *session)
592 struct pppol2tp_session *ps;
593 struct dst_entry *dst;
595 session->recv_skb = pppol2tp_recv;
596 session->session_close = pppol2tp_session_close;
597 #if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
598 session->show = pppol2tp_show;
601 ps = l2tp_session_priv(session);
602 mutex_init(&ps->sk_lock);
603 ps->tunnel_sock = session->tunnel->sock;
604 ps->owner = current->pid;
606 /* If PMTU discovery was enabled, use the MTU that was discovered */
607 dst = sk_dst_get(session->tunnel->sock);
609 u32 pmtu = dst_mtu(dst);
612 session->mtu = pmtu - PPPOL2TP_HEADER_OVERHEAD;
613 session->mru = pmtu - PPPOL2TP_HEADER_OVERHEAD;
619 /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
621 static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
622 int sockaddr_len, int flags)
624 struct sock *sk = sock->sk;
625 struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr;
626 struct pppox_sock *po = pppox_sk(sk);
627 struct l2tp_session *session = NULL;
628 struct l2tp_tunnel *tunnel;
629 struct pppol2tp_session *ps;
630 struct l2tp_session_cfg cfg = { 0, };
632 u32 tunnel_id, peer_tunnel_id;
633 u32 session_id, peer_session_id;
634 bool drop_refcnt = false;
642 if (sockaddr_len != sizeof(struct sockaddr_pppol2tp) &&
643 sockaddr_len != sizeof(struct sockaddr_pppol2tpv3) &&
644 sockaddr_len != sizeof(struct sockaddr_pppol2tpin6) &&
645 sockaddr_len != sizeof(struct sockaddr_pppol2tpv3in6))
648 if (sp->sa_protocol != PX_PROTO_OL2TP)
651 /* Check for already bound sockets */
653 if (sk->sk_state & PPPOX_CONNECTED)
656 /* We don't supporting rebinding anyway */
658 if (sk->sk_user_data)
659 goto end; /* socket is already attached */
661 /* Get params from socket address. Handle L2TPv2 and L2TPv3.
662 * This is nasty because there are different sockaddr_pppol2tp
663 * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use
664 * the sockaddr size to determine which structure the caller
668 if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) {
669 fd = sp->pppol2tp.fd;
670 tunnel_id = sp->pppol2tp.s_tunnel;
671 peer_tunnel_id = sp->pppol2tp.d_tunnel;
672 session_id = sp->pppol2tp.s_session;
673 peer_session_id = sp->pppol2tp.d_session;
674 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) {
675 struct sockaddr_pppol2tpv3 *sp3 =
676 (struct sockaddr_pppol2tpv3 *) sp;
678 fd = sp3->pppol2tp.fd;
679 tunnel_id = sp3->pppol2tp.s_tunnel;
680 peer_tunnel_id = sp3->pppol2tp.d_tunnel;
681 session_id = sp3->pppol2tp.s_session;
682 peer_session_id = sp3->pppol2tp.d_session;
683 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpin6)) {
684 struct sockaddr_pppol2tpin6 *sp6 =
685 (struct sockaddr_pppol2tpin6 *) sp;
686 fd = sp6->pppol2tp.fd;
687 tunnel_id = sp6->pppol2tp.s_tunnel;
688 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
689 session_id = sp6->pppol2tp.s_session;
690 peer_session_id = sp6->pppol2tp.d_session;
691 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3in6)) {
692 struct sockaddr_pppol2tpv3in6 *sp6 =
693 (struct sockaddr_pppol2tpv3in6 *) sp;
695 fd = sp6->pppol2tp.fd;
696 tunnel_id = sp6->pppol2tp.s_tunnel;
697 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
698 session_id = sp6->pppol2tp.s_session;
699 peer_session_id = sp6->pppol2tp.d_session;
702 goto end; /* bad socket address */
705 /* Don't bind if tunnel_id is 0 */
710 tunnel = l2tp_tunnel_find(sock_net(sk), tunnel_id);
712 /* Special case: create tunnel context if session_id and
713 * peer_session_id is 0. Otherwise look up tunnel using supplied
716 if ((session_id == 0) && (peer_session_id == 0)) {
717 if (tunnel == NULL) {
718 struct l2tp_tunnel_cfg tcfg = {
719 .encap = L2TP_ENCAPTYPE_UDP,
722 error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel);
727 /* Error if we can't find the tunnel */
732 /* Error if socket is not prepped */
733 if (tunnel->sock == NULL)
737 if (tunnel->recv_payload_hook == NULL)
738 tunnel->recv_payload_hook = pppol2tp_recv_payload_hook;
740 if (tunnel->peer_tunnel_id == 0)
741 tunnel->peer_tunnel_id = peer_tunnel_id;
743 session = l2tp_session_get(sock_net(sk), tunnel, session_id, false);
746 ps = l2tp_session_priv(session);
748 /* Using a pre-existing session is fine as long as it hasn't
749 * been connected yet.
751 mutex_lock(&ps->sk_lock);
752 if (rcu_dereference_protected(ps->sk,
753 lockdep_is_held(&ps->sk_lock))) {
754 mutex_unlock(&ps->sk_lock);
759 /* consistency checks */
760 if (ps->tunnel_sock != tunnel->sock) {
761 mutex_unlock(&ps->sk_lock);
766 /* Default MTU must allow space for UDP/L2TP/PPP headers */
767 cfg.mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
770 session = l2tp_session_create(sizeof(struct pppol2tp_session),
772 peer_session_id, &cfg);
773 if (IS_ERR(session)) {
774 error = PTR_ERR(session);
778 pppol2tp_session_init(session);
779 ps = l2tp_session_priv(session);
780 l2tp_session_inc_refcount(session);
782 mutex_lock(&ps->sk_lock);
783 error = l2tp_session_register(session, tunnel);
785 mutex_unlock(&ps->sk_lock);
792 /* Special case: if source & dest session_id == 0x0000, this
793 * socket is being created to manage the tunnel. Just set up
794 * the internal context for use by ioctl() and sockopt()
797 if ((session->session_id == 0) &&
798 (session->peer_session_id == 0)) {
803 /* The only header we need to worry about is the L2TP
804 * header. This size is different depending on whether
805 * sequence numbers are enabled for the data channel.
807 po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
809 po->chan.private = sk;
810 po->chan.ops = &pppol2tp_chan_ops;
811 po->chan.mtu = session->mtu;
813 error = ppp_register_net_channel(sock_net(sk), &po->chan);
815 mutex_unlock(&ps->sk_lock);
820 /* This is how we get the session context from the socket. */
822 sk->sk_user_data = session;
823 rcu_assign_pointer(ps->sk, sk);
824 mutex_unlock(&ps->sk_lock);
826 /* Keep the reference we've grabbed on the session: sk doesn't expect
827 * the session to disappear. pppol2tp_session_destruct() is responsible
832 sk->sk_state = PPPOX_CONNECTED;
833 l2tp_info(session, L2TP_MSG_CONTROL, "%s: created\n",
838 l2tp_session_dec_refcount(session);
844 #ifdef CONFIG_L2TP_V3
846 /* Called when creating sessions via the netlink interface. */
847 static int pppol2tp_session_create(struct net *net, struct l2tp_tunnel *tunnel,
848 u32 session_id, u32 peer_session_id,
849 struct l2tp_session_cfg *cfg)
852 struct l2tp_session *session;
854 /* Error if tunnel socket is not prepped */
860 /* Default MTU values. */
862 cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
866 /* Allocate and initialize a new session context. */
867 session = l2tp_session_create(sizeof(struct pppol2tp_session),
869 peer_session_id, cfg);
870 if (IS_ERR(session)) {
871 error = PTR_ERR(session);
875 pppol2tp_session_init(session);
877 error = l2tp_session_register(session, tunnel);
889 #endif /* CONFIG_L2TP_V3 */
891 /* getname() support.
893 static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
894 int *usockaddr_len, int peer)
898 struct l2tp_session *session;
899 struct l2tp_tunnel *tunnel;
900 struct sock *sk = sock->sk;
901 struct inet_sock *inet;
902 struct pppol2tp_session *pls;
907 if (!(sk->sk_state & PPPOX_CONNECTED))
911 session = pppol2tp_sock_to_session(sk);
915 pls = l2tp_session_priv(session);
916 tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock);
920 inet = inet_sk(tunnel->sock);
921 if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) {
922 struct sockaddr_pppol2tp sp;
925 sp.sa_family = AF_PPPOX;
926 sp.sa_protocol = PX_PROTO_OL2TP;
927 sp.pppol2tp.fd = tunnel->fd;
928 sp.pppol2tp.pid = pls->owner;
929 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
930 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
931 sp.pppol2tp.s_session = session->session_id;
932 sp.pppol2tp.d_session = session->peer_session_id;
933 sp.pppol2tp.addr.sin_family = AF_INET;
934 sp.pppol2tp.addr.sin_port = inet->inet_dport;
935 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
936 memcpy(uaddr, &sp, len);
937 #if IS_ENABLED(CONFIG_IPV6)
938 } else if ((tunnel->version == 2) &&
939 (tunnel->sock->sk_family == AF_INET6)) {
940 struct sockaddr_pppol2tpin6 sp;
944 sp.sa_family = AF_PPPOX;
945 sp.sa_protocol = PX_PROTO_OL2TP;
946 sp.pppol2tp.fd = tunnel->fd;
947 sp.pppol2tp.pid = pls->owner;
948 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
949 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
950 sp.pppol2tp.s_session = session->session_id;
951 sp.pppol2tp.d_session = session->peer_session_id;
952 sp.pppol2tp.addr.sin6_family = AF_INET6;
953 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
954 memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
955 sizeof(tunnel->sock->sk_v6_daddr));
956 memcpy(uaddr, &sp, len);
957 } else if ((tunnel->version == 3) &&
958 (tunnel->sock->sk_family == AF_INET6)) {
959 struct sockaddr_pppol2tpv3in6 sp;
963 sp.sa_family = AF_PPPOX;
964 sp.sa_protocol = PX_PROTO_OL2TP;
965 sp.pppol2tp.fd = tunnel->fd;
966 sp.pppol2tp.pid = pls->owner;
967 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
968 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
969 sp.pppol2tp.s_session = session->session_id;
970 sp.pppol2tp.d_session = session->peer_session_id;
971 sp.pppol2tp.addr.sin6_family = AF_INET6;
972 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
973 memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
974 sizeof(tunnel->sock->sk_v6_daddr));
975 memcpy(uaddr, &sp, len);
977 } else if (tunnel->version == 3) {
978 struct sockaddr_pppol2tpv3 sp;
981 sp.sa_family = AF_PPPOX;
982 sp.sa_protocol = PX_PROTO_OL2TP;
983 sp.pppol2tp.fd = tunnel->fd;
984 sp.pppol2tp.pid = pls->owner;
985 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
986 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
987 sp.pppol2tp.s_session = session->session_id;
988 sp.pppol2tp.d_session = session->peer_session_id;
989 sp.pppol2tp.addr.sin_family = AF_INET;
990 sp.pppol2tp.addr.sin_port = inet->inet_dport;
991 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
992 memcpy(uaddr, &sp, len);
995 *usockaddr_len = len;
998 sock_put(pls->tunnel_sock);
1005 /****************************************************************************
1008 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1009 * sockets. However, in order to control kernel tunnel features, we allow
1010 * userspace to create a special "tunnel" PPPoX socket which is used for
1011 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
1012 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
1014 ****************************************************************************/
1016 static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest,
1017 struct l2tp_stats *stats)
1019 dest->tx_packets = atomic_long_read(&stats->tx_packets);
1020 dest->tx_bytes = atomic_long_read(&stats->tx_bytes);
1021 dest->tx_errors = atomic_long_read(&stats->tx_errors);
1022 dest->rx_packets = atomic_long_read(&stats->rx_packets);
1023 dest->rx_bytes = atomic_long_read(&stats->rx_bytes);
1024 dest->rx_seq_discards = atomic_long_read(&stats->rx_seq_discards);
1025 dest->rx_oos_packets = atomic_long_read(&stats->rx_oos_packets);
1026 dest->rx_errors = atomic_long_read(&stats->rx_errors);
1029 /* Session ioctl helper.
1031 static int pppol2tp_session_ioctl(struct l2tp_session *session,
1032 unsigned int cmd, unsigned long arg)
1037 int val = (int) arg;
1038 struct pppol2tp_session *ps = l2tp_session_priv(session);
1039 struct l2tp_tunnel *tunnel = session->tunnel;
1040 struct pppol2tp_ioc_stats stats;
1042 l2tp_dbg(session, L2TP_MSG_CONTROL,
1043 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
1044 session->name, cmd, arg);
1046 sk = pppol2tp_session_get_sock(session);
1053 if (!(sk->sk_state & PPPOX_CONNECTED))
1057 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1059 ifr.ifr_mtu = session->mtu;
1060 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
1063 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mtu=%d\n",
1064 session->name, session->mtu);
1070 if (!(sk->sk_state & PPPOX_CONNECTED))
1074 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1077 session->mtu = ifr.ifr_mtu;
1079 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mtu=%d\n",
1080 session->name, session->mtu);
1086 if (!(sk->sk_state & PPPOX_CONNECTED))
1090 if (put_user(session->mru, (int __user *) arg))
1093 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mru=%d\n",
1094 session->name, session->mru);
1100 if (!(sk->sk_state & PPPOX_CONNECTED))
1104 if (get_user(val, (int __user *) arg))
1108 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mru=%d\n",
1109 session->name, session->mru);
1115 if (put_user(ps->flags, (int __user *) arg))
1118 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get flags=%d\n",
1119 session->name, ps->flags);
1125 if (get_user(val, (int __user *) arg))
1128 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set flags=%d\n",
1129 session->name, ps->flags);
1133 case PPPIOCGL2TPSTATS:
1135 if (!(sk->sk_state & PPPOX_CONNECTED))
1138 memset(&stats, 0, sizeof(stats));
1139 stats.tunnel_id = tunnel->tunnel_id;
1140 stats.session_id = session->session_id;
1141 pppol2tp_copy_stats(&stats, &session->stats);
1142 if (copy_to_user((void __user *) arg, &stats,
1145 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1160 /* Tunnel ioctl helper.
1162 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1163 * specifies a session_id, the session ioctl handler is called. This allows an
1164 * application to retrieve session stats via a tunnel socket.
1166 static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
1167 unsigned int cmd, unsigned long arg)
1171 struct pppol2tp_ioc_stats stats;
1173 l2tp_dbg(tunnel, L2TP_MSG_CONTROL,
1174 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1175 tunnel->name, cmd, arg);
1181 case PPPIOCGL2TPSTATS:
1183 if (!(sk->sk_state & PPPOX_CONNECTED))
1186 if (copy_from_user(&stats, (void __user *) arg,
1191 if (stats.session_id != 0) {
1192 /* resend to session ioctl handler */
1193 struct l2tp_session *session =
1194 l2tp_session_get(sock_net(sk), tunnel,
1195 stats.session_id, true);
1198 err = pppol2tp_session_ioctl(session, cmd,
1201 session->deref(session);
1202 l2tp_session_dec_refcount(session);
1209 stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
1211 pppol2tp_copy_stats(&stats, &tunnel->stats);
1212 if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) {
1216 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1231 /* Main ioctl() handler.
1232 * Dispatch to tunnel or session helpers depending on the socket.
1234 static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
1237 struct sock *sk = sock->sk;
1238 struct l2tp_session *session;
1239 struct l2tp_tunnel *tunnel;
1240 struct pppol2tp_session *ps;
1247 if (sock_flag(sk, SOCK_DEAD) != 0)
1251 if ((sk->sk_user_data == NULL) ||
1252 (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
1255 /* Get session context from the socket */
1257 session = pppol2tp_sock_to_session(sk);
1258 if (session == NULL)
1261 /* Special case: if session's session_id is zero, treat ioctl as a
1264 ps = l2tp_session_priv(session);
1265 if ((session->session_id == 0) &&
1266 (session->peer_session_id == 0)) {
1268 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1272 err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
1273 sock_put(ps->tunnel_sock);
1277 err = pppol2tp_session_ioctl(session, cmd, arg);
1285 /*****************************************************************************
1286 * setsockopt() / getsockopt() support.
1288 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1289 * sockets. In order to control kernel tunnel features, we allow userspace to
1290 * create a special "tunnel" PPPoX socket which is used for control only.
1291 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1292 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1293 *****************************************************************************/
1295 /* Tunnel setsockopt() helper.
1297 static int pppol2tp_tunnel_setsockopt(struct sock *sk,
1298 struct l2tp_tunnel *tunnel,
1299 int optname, int val)
1304 case PPPOL2TP_SO_DEBUG:
1305 tunnel->debug = val;
1306 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: set debug=%x\n",
1307 tunnel->name, tunnel->debug);
1318 /* Session setsockopt helper.
1320 static int pppol2tp_session_setsockopt(struct sock *sk,
1321 struct l2tp_session *session,
1322 int optname, int val)
1327 case PPPOL2TP_SO_RECVSEQ:
1328 if ((val != 0) && (val != 1)) {
1332 session->recv_seq = val ? -1 : 0;
1333 l2tp_info(session, L2TP_MSG_CONTROL,
1334 "%s: set recv_seq=%d\n",
1335 session->name, session->recv_seq);
1338 case PPPOL2TP_SO_SENDSEQ:
1339 if ((val != 0) && (val != 1)) {
1343 session->send_seq = val ? -1 : 0;
1345 struct pppox_sock *po = pppox_sk(sk);
1347 po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
1348 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1350 l2tp_session_set_header_len(session, session->tunnel->version);
1351 l2tp_info(session, L2TP_MSG_CONTROL,
1352 "%s: set send_seq=%d\n",
1353 session->name, session->send_seq);
1356 case PPPOL2TP_SO_LNSMODE:
1357 if ((val != 0) && (val != 1)) {
1361 session->lns_mode = val ? -1 : 0;
1362 l2tp_info(session, L2TP_MSG_CONTROL,
1363 "%s: set lns_mode=%d\n",
1364 session->name, session->lns_mode);
1367 case PPPOL2TP_SO_DEBUG:
1368 session->debug = val;
1369 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set debug=%x\n",
1370 session->name, session->debug);
1373 case PPPOL2TP_SO_REORDERTO:
1374 session->reorder_timeout = msecs_to_jiffies(val);
1375 l2tp_info(session, L2TP_MSG_CONTROL,
1376 "%s: set reorder_timeout=%d\n",
1377 session->name, session->reorder_timeout);
1388 /* Main setsockopt() entry point.
1389 * Does API checks, then calls either the tunnel or session setsockopt
1390 * handler, according to whether the PPPoL2TP socket is a for a regular
1391 * session or the special tunnel type.
1393 static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
1394 char __user *optval, unsigned int optlen)
1396 struct sock *sk = sock->sk;
1397 struct l2tp_session *session;
1398 struct l2tp_tunnel *tunnel;
1399 struct pppol2tp_session *ps;
1403 if (level != SOL_PPPOL2TP)
1406 if (optlen < sizeof(int))
1409 if (get_user(val, (int __user *)optval))
1413 if (sk->sk_user_data == NULL)
1416 /* Get session context from the socket */
1418 session = pppol2tp_sock_to_session(sk);
1419 if (session == NULL)
1422 /* Special case: if session_id == 0x0000, treat as operation on tunnel
1424 ps = l2tp_session_priv(session);
1425 if ((session->session_id == 0) &&
1426 (session->peer_session_id == 0)) {
1428 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1432 err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
1433 sock_put(ps->tunnel_sock);
1435 err = pppol2tp_session_setsockopt(sk, session, optname, val);
1445 /* Tunnel getsockopt helper. Called with sock locked.
1447 static int pppol2tp_tunnel_getsockopt(struct sock *sk,
1448 struct l2tp_tunnel *tunnel,
1449 int optname, int *val)
1454 case PPPOL2TP_SO_DEBUG:
1455 *val = tunnel->debug;
1456 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get debug=%x\n",
1457 tunnel->name, tunnel->debug);
1468 /* Session getsockopt helper. Called with sock locked.
1470 static int pppol2tp_session_getsockopt(struct sock *sk,
1471 struct l2tp_session *session,
1472 int optname, int *val)
1477 case PPPOL2TP_SO_RECVSEQ:
1478 *val = session->recv_seq;
1479 l2tp_info(session, L2TP_MSG_CONTROL,
1480 "%s: get recv_seq=%d\n", session->name, *val);
1483 case PPPOL2TP_SO_SENDSEQ:
1484 *val = session->send_seq;
1485 l2tp_info(session, L2TP_MSG_CONTROL,
1486 "%s: get send_seq=%d\n", session->name, *val);
1489 case PPPOL2TP_SO_LNSMODE:
1490 *val = session->lns_mode;
1491 l2tp_info(session, L2TP_MSG_CONTROL,
1492 "%s: get lns_mode=%d\n", session->name, *val);
1495 case PPPOL2TP_SO_DEBUG:
1496 *val = session->debug;
1497 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get debug=%d\n",
1498 session->name, *val);
1501 case PPPOL2TP_SO_REORDERTO:
1502 *val = (int) jiffies_to_msecs(session->reorder_timeout);
1503 l2tp_info(session, L2TP_MSG_CONTROL,
1504 "%s: get reorder_timeout=%d\n", session->name, *val);
1514 /* Main getsockopt() entry point.
1515 * Does API checks, then calls either the tunnel or session getsockopt
1516 * handler, according to whether the PPPoX socket is a for a regular session
1517 * or the special tunnel type.
1519 static int pppol2tp_getsockopt(struct socket *sock, int level, int optname,
1520 char __user *optval, int __user *optlen)
1522 struct sock *sk = sock->sk;
1523 struct l2tp_session *session;
1524 struct l2tp_tunnel *tunnel;
1527 struct pppol2tp_session *ps;
1529 if (level != SOL_PPPOL2TP)
1532 if (get_user(len, optlen))
1535 len = min_t(unsigned int, len, sizeof(int));
1541 if (sk->sk_user_data == NULL)
1544 /* Get the session context */
1546 session = pppol2tp_sock_to_session(sk);
1547 if (session == NULL)
1550 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1551 ps = l2tp_session_priv(session);
1552 if ((session->session_id == 0) &&
1553 (session->peer_session_id == 0)) {
1555 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1559 err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
1560 sock_put(ps->tunnel_sock);
1562 err = pppol2tp_session_getsockopt(sk, session, optname, &val);
1565 if (put_user(len, optlen))
1568 if (copy_to_user((void __user *) optval, &val, len))
1579 /*****************************************************************************
1580 * /proc filesystem for debug
1581 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1582 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1583 *****************************************************************************/
1585 static unsigned int pppol2tp_net_id;
1587 #ifdef CONFIG_PROC_FS
1589 struct pppol2tp_seq_data {
1590 struct seq_net_private p;
1591 int tunnel_idx; /* current tunnel */
1592 int session_idx; /* index of session within current tunnel */
1593 struct l2tp_tunnel *tunnel;
1594 struct l2tp_session *session; /* NULL means get next tunnel */
1597 static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
1600 pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx);
1603 if (pd->tunnel == NULL)
1606 /* Ignore L2TPv3 tunnels */
1607 if (pd->tunnel->version < 3)
1612 static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
1614 pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx, true);
1617 if (pd->session == NULL) {
1618 pd->session_idx = 0;
1619 pppol2tp_next_tunnel(net, pd);
1623 static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
1625 struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
1632 BUG_ON(m->private == NULL);
1634 net = seq_file_net(m);
1636 if (pd->tunnel == NULL)
1637 pppol2tp_next_tunnel(net, pd);
1639 pppol2tp_next_session(net, pd);
1641 /* NULL tunnel and session indicates end of list */
1642 if ((pd->tunnel == NULL) && (pd->session == NULL))
1649 static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
1655 static void pppol2tp_seq_stop(struct seq_file *p, void *v)
1660 static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
1662 struct l2tp_tunnel *tunnel = v;
1664 seq_printf(m, "\nTUNNEL '%s', %c %d\n",
1666 (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
1667 atomic_read(&tunnel->ref_count) - 1);
1668 seq_printf(m, " %08x %ld/%ld/%ld %ld/%ld/%ld\n",
1670 atomic_long_read(&tunnel->stats.tx_packets),
1671 atomic_long_read(&tunnel->stats.tx_bytes),
1672 atomic_long_read(&tunnel->stats.tx_errors),
1673 atomic_long_read(&tunnel->stats.rx_packets),
1674 atomic_long_read(&tunnel->stats.rx_bytes),
1675 atomic_long_read(&tunnel->stats.rx_errors));
1678 static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
1680 struct l2tp_session *session = v;
1681 struct l2tp_tunnel *tunnel = session->tunnel;
1682 unsigned char state;
1689 struct inet_sock *inet = inet_sk(tunnel->sock);
1690 ip = ntohl(inet->inet_saddr);
1691 port = ntohs(inet->inet_sport);
1694 sk = pppol2tp_session_get_sock(session);
1696 state = sk->sk_state;
1697 user_data_ok = (session == sk->sk_user_data) ? 'Y' : 'N';
1703 seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
1704 "%04X/%04X %d %c\n",
1705 session->name, ip, port,
1707 session->session_id,
1708 tunnel->peer_tunnel_id,
1709 session->peer_session_id,
1710 state, user_data_ok);
1711 seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n",
1712 session->mtu, session->mru,
1713 session->recv_seq ? 'R' : '-',
1714 session->send_seq ? 'S' : '-',
1715 session->lns_mode ? "LNS" : "LAC",
1717 jiffies_to_msecs(session->reorder_timeout));
1718 seq_printf(m, " %hu/%hu %ld/%ld/%ld %ld/%ld/%ld\n",
1719 session->nr, session->ns,
1720 atomic_long_read(&session->stats.tx_packets),
1721 atomic_long_read(&session->stats.tx_bytes),
1722 atomic_long_read(&session->stats.tx_errors),
1723 atomic_long_read(&session->stats.rx_packets),
1724 atomic_long_read(&session->stats.rx_bytes),
1725 atomic_long_read(&session->stats.rx_errors));
1728 struct pppox_sock *po = pppox_sk(sk);
1730 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
1735 static int pppol2tp_seq_show(struct seq_file *m, void *v)
1737 struct pppol2tp_seq_data *pd = v;
1739 /* display header on line 1 */
1740 if (v == SEQ_START_TOKEN) {
1741 seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
1742 seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
1743 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1744 seq_puts(m, " SESSION name, addr/port src-tid/sid "
1745 "dest-tid/sid state user-data-ok\n");
1746 seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1747 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1751 /* Show the tunnel or session context.
1754 pppol2tp_seq_tunnel_show(m, pd->tunnel);
1756 pppol2tp_seq_session_show(m, pd->session);
1757 if (pd->session->deref)
1758 pd->session->deref(pd->session);
1759 l2tp_session_dec_refcount(pd->session);
1766 static const struct seq_operations pppol2tp_seq_ops = {
1767 .start = pppol2tp_seq_start,
1768 .next = pppol2tp_seq_next,
1769 .stop = pppol2tp_seq_stop,
1770 .show = pppol2tp_seq_show,
1773 /* Called when our /proc file is opened. We allocate data for use when
1774 * iterating our tunnel / session contexts and store it in the private
1775 * data of the seq_file.
1777 static int pppol2tp_proc_open(struct inode *inode, struct file *file)
1779 return seq_open_net(inode, file, &pppol2tp_seq_ops,
1780 sizeof(struct pppol2tp_seq_data));
1783 static const struct file_operations pppol2tp_proc_fops = {
1784 .owner = THIS_MODULE,
1785 .open = pppol2tp_proc_open,
1787 .llseek = seq_lseek,
1788 .release = seq_release_net,
1791 #endif /* CONFIG_PROC_FS */
1793 /*****************************************************************************
1795 *****************************************************************************/
1797 static __net_init int pppol2tp_init_net(struct net *net)
1799 struct proc_dir_entry *pde;
1802 pde = proc_create("pppol2tp", S_IRUGO, net->proc_net,
1803 &pppol2tp_proc_fops);
1813 static __net_exit void pppol2tp_exit_net(struct net *net)
1815 remove_proc_entry("pppol2tp", net->proc_net);
1818 static struct pernet_operations pppol2tp_net_ops = {
1819 .init = pppol2tp_init_net,
1820 .exit = pppol2tp_exit_net,
1821 .id = &pppol2tp_net_id,
1824 /*****************************************************************************
1826 *****************************************************************************/
1828 static const struct proto_ops pppol2tp_ops = {
1830 .owner = THIS_MODULE,
1831 .release = pppol2tp_release,
1832 .bind = sock_no_bind,
1833 .connect = pppol2tp_connect,
1834 .socketpair = sock_no_socketpair,
1835 .accept = sock_no_accept,
1836 .getname = pppol2tp_getname,
1837 .poll = datagram_poll,
1838 .listen = sock_no_listen,
1839 .shutdown = sock_no_shutdown,
1840 .setsockopt = pppol2tp_setsockopt,
1841 .getsockopt = pppol2tp_getsockopt,
1842 .sendmsg = pppol2tp_sendmsg,
1843 .recvmsg = pppol2tp_recvmsg,
1844 .mmap = sock_no_mmap,
1845 .ioctl = pppox_ioctl,
1846 #ifdef CONFIG_COMPAT
1847 .compat_ioctl = pppox_compat_ioctl,
1851 static const struct pppox_proto pppol2tp_proto = {
1852 .create = pppol2tp_create,
1853 .ioctl = pppol2tp_ioctl,
1854 .owner = THIS_MODULE,
1857 #ifdef CONFIG_L2TP_V3
1859 static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = {
1860 .session_create = pppol2tp_session_create,
1861 .session_delete = l2tp_session_delete,
1864 #endif /* CONFIG_L2TP_V3 */
1866 static int __init pppol2tp_init(void)
1870 err = register_pernet_device(&pppol2tp_net_ops);
1874 err = proto_register(&pppol2tp_sk_proto, 0);
1876 goto out_unregister_pppol2tp_pernet;
1878 err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
1880 goto out_unregister_pppol2tp_proto;
1882 #ifdef CONFIG_L2TP_V3
1883 err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops);
1885 goto out_unregister_pppox;
1888 pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION);
1893 #ifdef CONFIG_L2TP_V3
1894 out_unregister_pppox:
1895 unregister_pppox_proto(PX_PROTO_OL2TP);
1897 out_unregister_pppol2tp_proto:
1898 proto_unregister(&pppol2tp_sk_proto);
1899 out_unregister_pppol2tp_pernet:
1900 unregister_pernet_device(&pppol2tp_net_ops);
1904 static void __exit pppol2tp_exit(void)
1906 #ifdef CONFIG_L2TP_V3
1907 l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP);
1909 unregister_pppox_proto(PX_PROTO_OL2TP);
1910 proto_unregister(&pppol2tp_sk_proto);
1911 unregister_pernet_device(&pppol2tp_net_ops);
1914 module_init(pppol2tp_init);
1915 module_exit(pppol2tp_exit);
1917 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1918 MODULE_DESCRIPTION("PPP over L2TP over UDP");
1919 MODULE_LICENSE("GPL");
1920 MODULE_VERSION(PPPOL2TP_DRV_VERSION);
1921 MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_OL2TP);
1922 MODULE_ALIAS_L2TP_PWTYPE(7);