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;
635 bool drop_tunnel = false;
643 if (sockaddr_len != sizeof(struct sockaddr_pppol2tp) &&
644 sockaddr_len != sizeof(struct sockaddr_pppol2tpv3) &&
645 sockaddr_len != sizeof(struct sockaddr_pppol2tpin6) &&
646 sockaddr_len != sizeof(struct sockaddr_pppol2tpv3in6))
649 if (sp->sa_protocol != PX_PROTO_OL2TP)
652 /* Check for already bound sockets */
654 if (sk->sk_state & PPPOX_CONNECTED)
657 /* We don't supporting rebinding anyway */
659 if (sk->sk_user_data)
660 goto end; /* socket is already attached */
662 /* Get params from socket address. Handle L2TPv2 and L2TPv3.
663 * This is nasty because there are different sockaddr_pppol2tp
664 * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use
665 * the sockaddr size to determine which structure the caller
669 if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) {
670 fd = sp->pppol2tp.fd;
671 tunnel_id = sp->pppol2tp.s_tunnel;
672 peer_tunnel_id = sp->pppol2tp.d_tunnel;
673 session_id = sp->pppol2tp.s_session;
674 peer_session_id = sp->pppol2tp.d_session;
675 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) {
676 struct sockaddr_pppol2tpv3 *sp3 =
677 (struct sockaddr_pppol2tpv3 *) sp;
679 fd = sp3->pppol2tp.fd;
680 tunnel_id = sp3->pppol2tp.s_tunnel;
681 peer_tunnel_id = sp3->pppol2tp.d_tunnel;
682 session_id = sp3->pppol2tp.s_session;
683 peer_session_id = sp3->pppol2tp.d_session;
684 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpin6)) {
685 struct sockaddr_pppol2tpin6 *sp6 =
686 (struct sockaddr_pppol2tpin6 *) sp;
687 fd = sp6->pppol2tp.fd;
688 tunnel_id = sp6->pppol2tp.s_tunnel;
689 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
690 session_id = sp6->pppol2tp.s_session;
691 peer_session_id = sp6->pppol2tp.d_session;
692 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3in6)) {
693 struct sockaddr_pppol2tpv3in6 *sp6 =
694 (struct sockaddr_pppol2tpv3in6 *) 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;
703 goto end; /* bad socket address */
706 /* Don't bind if tunnel_id is 0 */
711 tunnel = l2tp_tunnel_get(sock_net(sk), tunnel_id);
715 /* Special case: create tunnel context if session_id and
716 * peer_session_id is 0. Otherwise look up tunnel using supplied
719 if ((session_id == 0) && (peer_session_id == 0)) {
720 if (tunnel == NULL) {
721 struct l2tp_tunnel_cfg tcfg = {
722 .encap = L2TP_ENCAPTYPE_UDP,
725 error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel);
730 /* Error if we can't find the tunnel */
735 /* Error if socket is not prepped */
736 if (tunnel->sock == NULL)
740 if (tunnel->recv_payload_hook == NULL)
741 tunnel->recv_payload_hook = pppol2tp_recv_payload_hook;
743 if (tunnel->peer_tunnel_id == 0)
744 tunnel->peer_tunnel_id = peer_tunnel_id;
746 session = l2tp_session_get(sock_net(sk), tunnel, session_id, false);
749 ps = l2tp_session_priv(session);
751 /* Using a pre-existing session is fine as long as it hasn't
752 * been connected yet.
754 mutex_lock(&ps->sk_lock);
755 if (rcu_dereference_protected(ps->sk,
756 lockdep_is_held(&ps->sk_lock))) {
757 mutex_unlock(&ps->sk_lock);
762 /* consistency checks */
763 if (ps->tunnel_sock != tunnel->sock) {
764 mutex_unlock(&ps->sk_lock);
769 /* Default MTU must allow space for UDP/L2TP/PPP headers */
770 cfg.mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
773 session = l2tp_session_create(sizeof(struct pppol2tp_session),
775 peer_session_id, &cfg);
776 if (IS_ERR(session)) {
777 error = PTR_ERR(session);
781 pppol2tp_session_init(session);
782 ps = l2tp_session_priv(session);
783 l2tp_session_inc_refcount(session);
785 mutex_lock(&ps->sk_lock);
786 error = l2tp_session_register(session, tunnel);
788 mutex_unlock(&ps->sk_lock);
795 /* Special case: if source & dest session_id == 0x0000, this
796 * socket is being created to manage the tunnel. Just set up
797 * the internal context for use by ioctl() and sockopt()
800 if ((session->session_id == 0) &&
801 (session->peer_session_id == 0)) {
806 /* The only header we need to worry about is the L2TP
807 * header. This size is different depending on whether
808 * sequence numbers are enabled for the data channel.
810 po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
812 po->chan.private = sk;
813 po->chan.ops = &pppol2tp_chan_ops;
814 po->chan.mtu = session->mtu;
816 error = ppp_register_net_channel(sock_net(sk), &po->chan);
818 mutex_unlock(&ps->sk_lock);
823 /* This is how we get the session context from the socket. */
825 sk->sk_user_data = session;
826 rcu_assign_pointer(ps->sk, sk);
827 mutex_unlock(&ps->sk_lock);
829 /* Keep the reference we've grabbed on the session: sk doesn't expect
830 * the session to disappear. pppol2tp_session_destruct() is responsible
835 sk->sk_state = PPPOX_CONNECTED;
836 l2tp_info(session, L2TP_MSG_CONTROL, "%s: created\n",
841 l2tp_session_dec_refcount(session);
843 l2tp_tunnel_dec_refcount(tunnel);
849 #ifdef CONFIG_L2TP_V3
851 /* Called when creating sessions via the netlink interface. */
852 static int pppol2tp_session_create(struct net *net, struct l2tp_tunnel *tunnel,
853 u32 session_id, u32 peer_session_id,
854 struct l2tp_session_cfg *cfg)
857 struct l2tp_session *session;
859 /* Error if tunnel socket is not prepped */
865 /* Default MTU values. */
867 cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
871 /* Allocate and initialize a new session context. */
872 session = l2tp_session_create(sizeof(struct pppol2tp_session),
874 peer_session_id, cfg);
875 if (IS_ERR(session)) {
876 error = PTR_ERR(session);
880 pppol2tp_session_init(session);
882 error = l2tp_session_register(session, tunnel);
894 #endif /* CONFIG_L2TP_V3 */
896 /* getname() support.
898 static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
899 int *usockaddr_len, int peer)
903 struct l2tp_session *session;
904 struct l2tp_tunnel *tunnel;
905 struct sock *sk = sock->sk;
906 struct inet_sock *inet;
907 struct pppol2tp_session *pls;
912 if (!(sk->sk_state & PPPOX_CONNECTED))
916 session = pppol2tp_sock_to_session(sk);
920 pls = l2tp_session_priv(session);
921 tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock);
925 inet = inet_sk(tunnel->sock);
926 if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) {
927 struct sockaddr_pppol2tp sp;
930 sp.sa_family = AF_PPPOX;
931 sp.sa_protocol = PX_PROTO_OL2TP;
932 sp.pppol2tp.fd = tunnel->fd;
933 sp.pppol2tp.pid = pls->owner;
934 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
935 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
936 sp.pppol2tp.s_session = session->session_id;
937 sp.pppol2tp.d_session = session->peer_session_id;
938 sp.pppol2tp.addr.sin_family = AF_INET;
939 sp.pppol2tp.addr.sin_port = inet->inet_dport;
940 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
941 memcpy(uaddr, &sp, len);
942 #if IS_ENABLED(CONFIG_IPV6)
943 } else if ((tunnel->version == 2) &&
944 (tunnel->sock->sk_family == AF_INET6)) {
945 struct sockaddr_pppol2tpin6 sp;
949 sp.sa_family = AF_PPPOX;
950 sp.sa_protocol = PX_PROTO_OL2TP;
951 sp.pppol2tp.fd = tunnel->fd;
952 sp.pppol2tp.pid = pls->owner;
953 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
954 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
955 sp.pppol2tp.s_session = session->session_id;
956 sp.pppol2tp.d_session = session->peer_session_id;
957 sp.pppol2tp.addr.sin6_family = AF_INET6;
958 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
959 memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
960 sizeof(tunnel->sock->sk_v6_daddr));
961 memcpy(uaddr, &sp, len);
962 } else if ((tunnel->version == 3) &&
963 (tunnel->sock->sk_family == AF_INET6)) {
964 struct sockaddr_pppol2tpv3in6 sp;
968 sp.sa_family = AF_PPPOX;
969 sp.sa_protocol = PX_PROTO_OL2TP;
970 sp.pppol2tp.fd = tunnel->fd;
971 sp.pppol2tp.pid = pls->owner;
972 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
973 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
974 sp.pppol2tp.s_session = session->session_id;
975 sp.pppol2tp.d_session = session->peer_session_id;
976 sp.pppol2tp.addr.sin6_family = AF_INET6;
977 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
978 memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
979 sizeof(tunnel->sock->sk_v6_daddr));
980 memcpy(uaddr, &sp, len);
982 } else if (tunnel->version == 3) {
983 struct sockaddr_pppol2tpv3 sp;
986 sp.sa_family = AF_PPPOX;
987 sp.sa_protocol = PX_PROTO_OL2TP;
988 sp.pppol2tp.fd = tunnel->fd;
989 sp.pppol2tp.pid = pls->owner;
990 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
991 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
992 sp.pppol2tp.s_session = session->session_id;
993 sp.pppol2tp.d_session = session->peer_session_id;
994 sp.pppol2tp.addr.sin_family = AF_INET;
995 sp.pppol2tp.addr.sin_port = inet->inet_dport;
996 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
997 memcpy(uaddr, &sp, len);
1000 *usockaddr_len = len;
1003 sock_put(pls->tunnel_sock);
1010 /****************************************************************************
1013 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1014 * sockets. However, in order to control kernel tunnel features, we allow
1015 * userspace to create a special "tunnel" PPPoX socket which is used for
1016 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
1017 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
1019 ****************************************************************************/
1021 static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest,
1022 struct l2tp_stats *stats)
1024 dest->tx_packets = atomic_long_read(&stats->tx_packets);
1025 dest->tx_bytes = atomic_long_read(&stats->tx_bytes);
1026 dest->tx_errors = atomic_long_read(&stats->tx_errors);
1027 dest->rx_packets = atomic_long_read(&stats->rx_packets);
1028 dest->rx_bytes = atomic_long_read(&stats->rx_bytes);
1029 dest->rx_seq_discards = atomic_long_read(&stats->rx_seq_discards);
1030 dest->rx_oos_packets = atomic_long_read(&stats->rx_oos_packets);
1031 dest->rx_errors = atomic_long_read(&stats->rx_errors);
1034 /* Session ioctl helper.
1036 static int pppol2tp_session_ioctl(struct l2tp_session *session,
1037 unsigned int cmd, unsigned long arg)
1042 int val = (int) arg;
1043 struct pppol2tp_session *ps = l2tp_session_priv(session);
1044 struct l2tp_tunnel *tunnel = session->tunnel;
1045 struct pppol2tp_ioc_stats stats;
1047 l2tp_dbg(session, L2TP_MSG_CONTROL,
1048 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
1049 session->name, cmd, arg);
1051 sk = pppol2tp_session_get_sock(session);
1058 if (!(sk->sk_state & PPPOX_CONNECTED))
1062 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1064 ifr.ifr_mtu = session->mtu;
1065 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
1068 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mtu=%d\n",
1069 session->name, session->mtu);
1075 if (!(sk->sk_state & PPPOX_CONNECTED))
1079 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1082 session->mtu = ifr.ifr_mtu;
1084 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mtu=%d\n",
1085 session->name, session->mtu);
1091 if (!(sk->sk_state & PPPOX_CONNECTED))
1095 if (put_user(session->mru, (int __user *) arg))
1098 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mru=%d\n",
1099 session->name, session->mru);
1105 if (!(sk->sk_state & PPPOX_CONNECTED))
1109 if (get_user(val, (int __user *) arg))
1113 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mru=%d\n",
1114 session->name, session->mru);
1120 if (put_user(ps->flags, (int __user *) arg))
1123 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get flags=%d\n",
1124 session->name, ps->flags);
1130 if (get_user(val, (int __user *) arg))
1133 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set flags=%d\n",
1134 session->name, ps->flags);
1138 case PPPIOCGL2TPSTATS:
1140 if (!(sk->sk_state & PPPOX_CONNECTED))
1143 memset(&stats, 0, sizeof(stats));
1144 stats.tunnel_id = tunnel->tunnel_id;
1145 stats.session_id = session->session_id;
1146 pppol2tp_copy_stats(&stats, &session->stats);
1147 if (copy_to_user((void __user *) arg, &stats,
1150 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1165 /* Tunnel ioctl helper.
1167 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1168 * specifies a session_id, the session ioctl handler is called. This allows an
1169 * application to retrieve session stats via a tunnel socket.
1171 static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
1172 unsigned int cmd, unsigned long arg)
1176 struct pppol2tp_ioc_stats stats;
1178 l2tp_dbg(tunnel, L2TP_MSG_CONTROL,
1179 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1180 tunnel->name, cmd, arg);
1186 case PPPIOCGL2TPSTATS:
1188 if (!(sk->sk_state & PPPOX_CONNECTED))
1191 if (copy_from_user(&stats, (void __user *) arg,
1196 if (stats.session_id != 0) {
1197 /* resend to session ioctl handler */
1198 struct l2tp_session *session =
1199 l2tp_session_get(sock_net(sk), tunnel,
1200 stats.session_id, true);
1203 err = pppol2tp_session_ioctl(session, cmd,
1206 session->deref(session);
1207 l2tp_session_dec_refcount(session);
1214 stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
1216 pppol2tp_copy_stats(&stats, &tunnel->stats);
1217 if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) {
1221 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1236 /* Main ioctl() handler.
1237 * Dispatch to tunnel or session helpers depending on the socket.
1239 static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
1242 struct sock *sk = sock->sk;
1243 struct l2tp_session *session;
1244 struct l2tp_tunnel *tunnel;
1245 struct pppol2tp_session *ps;
1252 if (sock_flag(sk, SOCK_DEAD) != 0)
1256 if ((sk->sk_user_data == NULL) ||
1257 (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
1260 /* Get session context from the socket */
1262 session = pppol2tp_sock_to_session(sk);
1263 if (session == NULL)
1266 /* Special case: if session's session_id is zero, treat ioctl as a
1269 ps = l2tp_session_priv(session);
1270 if ((session->session_id == 0) &&
1271 (session->peer_session_id == 0)) {
1273 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1277 err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
1278 sock_put(ps->tunnel_sock);
1282 err = pppol2tp_session_ioctl(session, cmd, arg);
1290 /*****************************************************************************
1291 * setsockopt() / getsockopt() support.
1293 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1294 * sockets. In order to control kernel tunnel features, we allow userspace to
1295 * create a special "tunnel" PPPoX socket which is used for control only.
1296 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1297 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1298 *****************************************************************************/
1300 /* Tunnel setsockopt() helper.
1302 static int pppol2tp_tunnel_setsockopt(struct sock *sk,
1303 struct l2tp_tunnel *tunnel,
1304 int optname, int val)
1309 case PPPOL2TP_SO_DEBUG:
1310 tunnel->debug = val;
1311 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: set debug=%x\n",
1312 tunnel->name, tunnel->debug);
1323 /* Session setsockopt helper.
1325 static int pppol2tp_session_setsockopt(struct sock *sk,
1326 struct l2tp_session *session,
1327 int optname, int val)
1332 case PPPOL2TP_SO_RECVSEQ:
1333 if ((val != 0) && (val != 1)) {
1337 session->recv_seq = !!val;
1338 l2tp_info(session, L2TP_MSG_CONTROL,
1339 "%s: set recv_seq=%d\n",
1340 session->name, session->recv_seq);
1343 case PPPOL2TP_SO_SENDSEQ:
1344 if ((val != 0) && (val != 1)) {
1348 session->send_seq = !!val;
1350 struct pppox_sock *po = pppox_sk(sk);
1352 po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
1353 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1355 l2tp_session_set_header_len(session, session->tunnel->version);
1356 l2tp_info(session, L2TP_MSG_CONTROL,
1357 "%s: set send_seq=%d\n",
1358 session->name, session->send_seq);
1361 case PPPOL2TP_SO_LNSMODE:
1362 if ((val != 0) && (val != 1)) {
1366 session->lns_mode = !!val;
1367 l2tp_info(session, L2TP_MSG_CONTROL,
1368 "%s: set lns_mode=%d\n",
1369 session->name, session->lns_mode);
1372 case PPPOL2TP_SO_DEBUG:
1373 session->debug = val;
1374 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set debug=%x\n",
1375 session->name, session->debug);
1378 case PPPOL2TP_SO_REORDERTO:
1379 session->reorder_timeout = msecs_to_jiffies(val);
1380 l2tp_info(session, L2TP_MSG_CONTROL,
1381 "%s: set reorder_timeout=%d\n",
1382 session->name, session->reorder_timeout);
1393 /* Main setsockopt() entry point.
1394 * Does API checks, then calls either the tunnel or session setsockopt
1395 * handler, according to whether the PPPoL2TP socket is a for a regular
1396 * session or the special tunnel type.
1398 static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
1399 char __user *optval, unsigned int optlen)
1401 struct sock *sk = sock->sk;
1402 struct l2tp_session *session;
1403 struct l2tp_tunnel *tunnel;
1404 struct pppol2tp_session *ps;
1408 if (level != SOL_PPPOL2TP)
1411 if (optlen < sizeof(int))
1414 if (get_user(val, (int __user *)optval))
1418 if (sk->sk_user_data == NULL)
1421 /* Get session context from the socket */
1423 session = pppol2tp_sock_to_session(sk);
1424 if (session == NULL)
1427 /* Special case: if session_id == 0x0000, treat as operation on tunnel
1429 ps = l2tp_session_priv(session);
1430 if ((session->session_id == 0) &&
1431 (session->peer_session_id == 0)) {
1433 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1437 err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
1438 sock_put(ps->tunnel_sock);
1440 err = pppol2tp_session_setsockopt(sk, session, optname, val);
1448 /* Tunnel getsockopt helper. Called with sock locked.
1450 static int pppol2tp_tunnel_getsockopt(struct sock *sk,
1451 struct l2tp_tunnel *tunnel,
1452 int optname, int *val)
1457 case PPPOL2TP_SO_DEBUG:
1458 *val = tunnel->debug;
1459 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get debug=%x\n",
1460 tunnel->name, tunnel->debug);
1471 /* Session getsockopt helper. Called with sock locked.
1473 static int pppol2tp_session_getsockopt(struct sock *sk,
1474 struct l2tp_session *session,
1475 int optname, int *val)
1480 case PPPOL2TP_SO_RECVSEQ:
1481 *val = session->recv_seq;
1482 l2tp_info(session, L2TP_MSG_CONTROL,
1483 "%s: get recv_seq=%d\n", session->name, *val);
1486 case PPPOL2TP_SO_SENDSEQ:
1487 *val = session->send_seq;
1488 l2tp_info(session, L2TP_MSG_CONTROL,
1489 "%s: get send_seq=%d\n", session->name, *val);
1492 case PPPOL2TP_SO_LNSMODE:
1493 *val = session->lns_mode;
1494 l2tp_info(session, L2TP_MSG_CONTROL,
1495 "%s: get lns_mode=%d\n", session->name, *val);
1498 case PPPOL2TP_SO_DEBUG:
1499 *val = session->debug;
1500 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get debug=%d\n",
1501 session->name, *val);
1504 case PPPOL2TP_SO_REORDERTO:
1505 *val = (int) jiffies_to_msecs(session->reorder_timeout);
1506 l2tp_info(session, L2TP_MSG_CONTROL,
1507 "%s: get reorder_timeout=%d\n", session->name, *val);
1517 /* Main getsockopt() entry point.
1518 * Does API checks, then calls either the tunnel or session getsockopt
1519 * handler, according to whether the PPPoX socket is a for a regular session
1520 * or the special tunnel type.
1522 static int pppol2tp_getsockopt(struct socket *sock, int level, int optname,
1523 char __user *optval, int __user *optlen)
1525 struct sock *sk = sock->sk;
1526 struct l2tp_session *session;
1527 struct l2tp_tunnel *tunnel;
1530 struct pppol2tp_session *ps;
1532 if (level != SOL_PPPOL2TP)
1535 if (get_user(len, optlen))
1538 len = min_t(unsigned int, len, sizeof(int));
1544 if (sk->sk_user_data == NULL)
1547 /* Get the session context */
1549 session = pppol2tp_sock_to_session(sk);
1550 if (session == NULL)
1553 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1554 ps = l2tp_session_priv(session);
1555 if ((session->session_id == 0) &&
1556 (session->peer_session_id == 0)) {
1558 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1562 err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
1563 sock_put(ps->tunnel_sock);
1567 err = pppol2tp_session_getsockopt(sk, session, optname, &val);
1573 if (put_user(len, optlen))
1576 if (copy_to_user((void __user *) optval, &val, len))
1587 /*****************************************************************************
1588 * /proc filesystem for debug
1589 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1590 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1591 *****************************************************************************/
1593 static unsigned int pppol2tp_net_id;
1595 #ifdef CONFIG_PROC_FS
1597 struct pppol2tp_seq_data {
1598 struct seq_net_private p;
1599 int tunnel_idx; /* current tunnel */
1600 int session_idx; /* index of session within current tunnel */
1601 struct l2tp_tunnel *tunnel;
1602 struct l2tp_session *session; /* NULL means get next tunnel */
1605 static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
1608 pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx);
1611 if (pd->tunnel == NULL)
1614 /* Ignore L2TPv3 tunnels */
1615 if (pd->tunnel->version < 3)
1620 static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
1622 pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx, true);
1625 if (pd->session == NULL) {
1626 pd->session_idx = 0;
1627 pppol2tp_next_tunnel(net, pd);
1631 static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
1633 struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
1640 BUG_ON(m->private == NULL);
1642 net = seq_file_net(m);
1644 if (pd->tunnel == NULL)
1645 pppol2tp_next_tunnel(net, pd);
1647 pppol2tp_next_session(net, pd);
1649 /* NULL tunnel and session indicates end of list */
1650 if ((pd->tunnel == NULL) && (pd->session == NULL))
1657 static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
1663 static void pppol2tp_seq_stop(struct seq_file *p, void *v)
1668 static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
1670 struct l2tp_tunnel *tunnel = v;
1672 seq_printf(m, "\nTUNNEL '%s', %c %d\n",
1674 (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
1675 refcount_read(&tunnel->ref_count) - 1);
1676 seq_printf(m, " %08x %ld/%ld/%ld %ld/%ld/%ld\n",
1678 atomic_long_read(&tunnel->stats.tx_packets),
1679 atomic_long_read(&tunnel->stats.tx_bytes),
1680 atomic_long_read(&tunnel->stats.tx_errors),
1681 atomic_long_read(&tunnel->stats.rx_packets),
1682 atomic_long_read(&tunnel->stats.rx_bytes),
1683 atomic_long_read(&tunnel->stats.rx_errors));
1686 static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
1688 struct l2tp_session *session = v;
1689 struct l2tp_tunnel *tunnel = session->tunnel;
1690 unsigned char state;
1697 struct inet_sock *inet = inet_sk(tunnel->sock);
1698 ip = ntohl(inet->inet_saddr);
1699 port = ntohs(inet->inet_sport);
1702 sk = pppol2tp_session_get_sock(session);
1704 state = sk->sk_state;
1705 user_data_ok = (session == sk->sk_user_data) ? 'Y' : 'N';
1711 seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
1712 "%04X/%04X %d %c\n",
1713 session->name, ip, port,
1715 session->session_id,
1716 tunnel->peer_tunnel_id,
1717 session->peer_session_id,
1718 state, user_data_ok);
1719 seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n",
1720 session->mtu, session->mru,
1721 session->recv_seq ? 'R' : '-',
1722 session->send_seq ? 'S' : '-',
1723 session->lns_mode ? "LNS" : "LAC",
1725 jiffies_to_msecs(session->reorder_timeout));
1726 seq_printf(m, " %hu/%hu %ld/%ld/%ld %ld/%ld/%ld\n",
1727 session->nr, session->ns,
1728 atomic_long_read(&session->stats.tx_packets),
1729 atomic_long_read(&session->stats.tx_bytes),
1730 atomic_long_read(&session->stats.tx_errors),
1731 atomic_long_read(&session->stats.rx_packets),
1732 atomic_long_read(&session->stats.rx_bytes),
1733 atomic_long_read(&session->stats.rx_errors));
1736 struct pppox_sock *po = pppox_sk(sk);
1738 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
1743 static int pppol2tp_seq_show(struct seq_file *m, void *v)
1745 struct pppol2tp_seq_data *pd = v;
1747 /* display header on line 1 */
1748 if (v == SEQ_START_TOKEN) {
1749 seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
1750 seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
1751 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1752 seq_puts(m, " SESSION name, addr/port src-tid/sid "
1753 "dest-tid/sid state user-data-ok\n");
1754 seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1755 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1759 /* Show the tunnel or session context.
1762 pppol2tp_seq_tunnel_show(m, pd->tunnel);
1764 pppol2tp_seq_session_show(m, pd->session);
1765 if (pd->session->deref)
1766 pd->session->deref(pd->session);
1767 l2tp_session_dec_refcount(pd->session);
1774 static const struct seq_operations pppol2tp_seq_ops = {
1775 .start = pppol2tp_seq_start,
1776 .next = pppol2tp_seq_next,
1777 .stop = pppol2tp_seq_stop,
1778 .show = pppol2tp_seq_show,
1781 /* Called when our /proc file is opened. We allocate data for use when
1782 * iterating our tunnel / session contexts and store it in the private
1783 * data of the seq_file.
1785 static int pppol2tp_proc_open(struct inode *inode, struct file *file)
1787 return seq_open_net(inode, file, &pppol2tp_seq_ops,
1788 sizeof(struct pppol2tp_seq_data));
1791 static const struct file_operations pppol2tp_proc_fops = {
1792 .owner = THIS_MODULE,
1793 .open = pppol2tp_proc_open,
1795 .llseek = seq_lseek,
1796 .release = seq_release_net,
1799 #endif /* CONFIG_PROC_FS */
1801 /*****************************************************************************
1803 *****************************************************************************/
1805 static __net_init int pppol2tp_init_net(struct net *net)
1807 struct proc_dir_entry *pde;
1810 pde = proc_create("pppol2tp", S_IRUGO, net->proc_net,
1811 &pppol2tp_proc_fops);
1821 static __net_exit void pppol2tp_exit_net(struct net *net)
1823 remove_proc_entry("pppol2tp", net->proc_net);
1826 static struct pernet_operations pppol2tp_net_ops = {
1827 .init = pppol2tp_init_net,
1828 .exit = pppol2tp_exit_net,
1829 .id = &pppol2tp_net_id,
1832 /*****************************************************************************
1834 *****************************************************************************/
1836 static const struct proto_ops pppol2tp_ops = {
1838 .owner = THIS_MODULE,
1839 .release = pppol2tp_release,
1840 .bind = sock_no_bind,
1841 .connect = pppol2tp_connect,
1842 .socketpair = sock_no_socketpair,
1843 .accept = sock_no_accept,
1844 .getname = pppol2tp_getname,
1845 .poll = datagram_poll,
1846 .listen = sock_no_listen,
1847 .shutdown = sock_no_shutdown,
1848 .setsockopt = pppol2tp_setsockopt,
1849 .getsockopt = pppol2tp_getsockopt,
1850 .sendmsg = pppol2tp_sendmsg,
1851 .recvmsg = pppol2tp_recvmsg,
1852 .mmap = sock_no_mmap,
1853 .ioctl = pppox_ioctl,
1854 #ifdef CONFIG_COMPAT
1855 .compat_ioctl = pppox_compat_ioctl,
1859 static const struct pppox_proto pppol2tp_proto = {
1860 .create = pppol2tp_create,
1861 .ioctl = pppol2tp_ioctl,
1862 .owner = THIS_MODULE,
1865 #ifdef CONFIG_L2TP_V3
1867 static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = {
1868 .session_create = pppol2tp_session_create,
1869 .session_delete = l2tp_session_delete,
1872 #endif /* CONFIG_L2TP_V3 */
1874 static int __init pppol2tp_init(void)
1878 err = register_pernet_device(&pppol2tp_net_ops);
1882 err = proto_register(&pppol2tp_sk_proto, 0);
1884 goto out_unregister_pppol2tp_pernet;
1886 err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
1888 goto out_unregister_pppol2tp_proto;
1890 #ifdef CONFIG_L2TP_V3
1891 err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops);
1893 goto out_unregister_pppox;
1896 pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION);
1901 #ifdef CONFIG_L2TP_V3
1902 out_unregister_pppox:
1903 unregister_pppox_proto(PX_PROTO_OL2TP);
1905 out_unregister_pppol2tp_proto:
1906 proto_unregister(&pppol2tp_sk_proto);
1907 out_unregister_pppol2tp_pernet:
1908 unregister_pernet_device(&pppol2tp_net_ops);
1912 static void __exit pppol2tp_exit(void)
1914 #ifdef CONFIG_L2TP_V3
1915 l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP);
1917 unregister_pppox_proto(PX_PROTO_OL2TP);
1918 proto_unregister(&pppol2tp_sk_proto);
1919 unregister_pernet_device(&pppol2tp_net_ops);
1922 module_init(pppol2tp_init);
1923 module_exit(pppol2tp_exit);
1925 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1926 MODULE_DESCRIPTION("PPP over L2TP over UDP");
1927 MODULE_LICENSE("GPL");
1928 MODULE_VERSION(PPPOL2TP_DRV_VERSION);
1929 MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_OL2TP);
1930 MODULE_ALIAS_L2TP_PWTYPE(7);