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;
255 l2tp_dbg(session, L2TP_MSG_DATA,
256 "%s: recv %d byte data frame, passing to ppp\n",
257 session->name, data_len);
259 /* We need to forget all info related to the L2TP packet
260 * gathered in the skb as we are going to reuse the same
261 * skb for the inner packet.
263 * - reset xfrm (IPSec) information as it applies to
264 * the outer L2TP packet and not to the inner one
265 * - release the dst to force a route lookup on the inner
266 * IP packet since skb->dst currently points to the dst
268 * - reset netfilter information as it doesn't apply
269 * to the inner packet either
276 ppp_input(&po->chan, skb);
278 l2tp_dbg(session, L2TP_MSG_DATA,
279 "%s: recv %d byte data frame, passing to L2TP socket\n",
280 session->name, data_len);
282 if (sock_queue_rcv_skb(sk, skb) < 0) {
283 atomic_long_inc(&session->stats.rx_errors);
293 l2tp_info(session, L2TP_MSG_DATA, "%s: no socket\n", session->name);
297 /************************************************************************
299 ***********************************************************************/
301 /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here
302 * when a user application does a sendmsg() on the session socket. L2TP and
303 * PPP headers must be inserted into the user's data.
305 static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m,
308 struct sock *sk = sock->sk;
311 struct l2tp_session *session;
312 struct l2tp_tunnel *tunnel;
313 struct pppol2tp_session *ps;
317 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
320 /* Get session and tunnel contexts */
322 session = pppol2tp_sock_to_session(sk);
326 ps = l2tp_session_priv(session);
327 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
331 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
333 /* Allocate a socket buffer */
335 skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) +
336 uhlen + session->hdr_len +
337 2 + total_len, /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */
340 goto error_put_sess_tun;
342 /* Reserve space for headers. */
343 skb_reserve(skb, NET_SKB_PAD);
344 skb_reset_network_header(skb);
345 skb_reserve(skb, sizeof(struct iphdr));
346 skb_reset_transport_header(skb);
347 skb_reserve(skb, uhlen);
350 skb->data[0] = PPP_ALLSTATIONS;
351 skb->data[1] = PPP_UI;
354 /* Copy user data into skb */
355 error = memcpy_from_msg(skb_put(skb, total_len), m, total_len);
358 goto error_put_sess_tun;
362 l2tp_xmit_skb(session, skb, session->hdr_len);
365 sock_put(ps->tunnel_sock);
371 sock_put(ps->tunnel_sock);
378 /* Transmit function called by generic PPP driver. Sends PPP frame
379 * over PPPoL2TP socket.
381 * This is almost the same as pppol2tp_sendmsg(), but rather than
382 * being called with a msghdr from userspace, it is called with a skb
385 * The supplied skb from ppp doesn't have enough headroom for the
386 * insertion of L2TP, UDP and IP headers so we need to allocate more
387 * headroom in the skb. This will create a cloned skb. But we must be
388 * careful in the error case because the caller will expect to free
389 * the skb it supplied, not our cloned skb. So we take care to always
390 * leave the original skb unfreed if we return an error.
392 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
394 struct sock *sk = (struct sock *) chan->private;
396 struct l2tp_session *session;
397 struct l2tp_tunnel *tunnel;
398 struct pppol2tp_session *ps;
401 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
404 /* Get session and tunnel contexts from the socket */
405 session = pppol2tp_sock_to_session(sk);
409 ps = l2tp_session_priv(session);
410 sk_tun = ps->tunnel_sock;
413 tunnel = l2tp_sock_to_tunnel(sk_tun);
417 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
418 headroom = NET_SKB_PAD +
419 sizeof(struct iphdr) + /* IP header */
420 uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */
421 session->hdr_len + /* L2TP header */
422 2; /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */
423 if (skb_cow_head(skb, headroom))
424 goto abort_put_sess_tun;
426 /* Setup PPP header */
428 skb->data[0] = PPP_ALLSTATIONS;
429 skb->data[1] = PPP_UI;
432 l2tp_xmit_skb(session, skb, session->hdr_len);
444 /* Free the original skb */
449 /*****************************************************************************
450 * Session (and tunnel control) socket create/destroy.
451 *****************************************************************************/
453 /* Called by l2tp_core when a session socket is being closed.
455 static void pppol2tp_session_close(struct l2tp_session *session)
459 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
461 sk = pppol2tp_session_get_sock(session);
464 inet_shutdown(sk->sk_socket, SEND_SHUTDOWN);
469 /* Really kill the session socket. (Called from sock_put() if
472 static void pppol2tp_session_destruct(struct sock *sk)
474 struct l2tp_session *session = sk->sk_user_data;
476 skb_queue_purge(&sk->sk_receive_queue);
477 skb_queue_purge(&sk->sk_write_queue);
480 sk->sk_user_data = NULL;
481 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
482 l2tp_session_dec_refcount(session);
486 static void pppol2tp_put_sk(struct rcu_head *head)
488 struct pppol2tp_session *ps;
490 ps = container_of(head, typeof(*ps), rcu);
494 /* Called when the PPPoX socket (session) is closed.
496 static int pppol2tp_release(struct socket *sock)
498 struct sock *sk = sock->sk;
499 struct l2tp_session *session;
507 if (sock_flag(sk, SOCK_DEAD) != 0)
510 pppox_unbind_sock(sk);
512 /* Signal the death of the socket. */
513 sk->sk_state = PPPOX_DEAD;
517 session = pppol2tp_sock_to_session(sk);
519 if (session != NULL) {
520 struct pppol2tp_session *ps;
522 l2tp_session_delete(session);
524 ps = l2tp_session_priv(session);
525 mutex_lock(&ps->sk_lock);
526 ps->__sk = rcu_dereference_protected(ps->sk,
527 lockdep_is_held(&ps->sk_lock));
528 RCU_INIT_POINTER(ps->sk, NULL);
529 mutex_unlock(&ps->sk_lock);
530 call_rcu(&ps->rcu, pppol2tp_put_sk);
532 /* Rely on the sock_put() call at the end of the function for
533 * dropping the reference held by pppol2tp_sock_to_session().
534 * The last reference will be dropped by pppol2tp_put_sk().
539 /* This will delete the session context via
540 * pppol2tp_session_destruct() if the socket's refcnt drops to
552 static struct proto pppol2tp_sk_proto = {
554 .owner = THIS_MODULE,
555 .obj_size = sizeof(struct pppox_sock),
558 static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb)
562 rc = l2tp_udp_encap_recv(sk, skb);
566 return NET_RX_SUCCESS;
569 /* socket() handler. Initialize a new struct sock.
571 static int pppol2tp_create(struct net *net, struct socket *sock, int kern)
576 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto, kern);
580 sock_init_data(sock, sk);
582 sock->state = SS_UNCONNECTED;
583 sock->ops = &pppol2tp_ops;
585 sk->sk_backlog_rcv = pppol2tp_backlog_recv;
586 sk->sk_protocol = PX_PROTO_OL2TP;
587 sk->sk_family = PF_PPPOX;
588 sk->sk_state = PPPOX_NONE;
589 sk->sk_type = SOCK_STREAM;
590 sk->sk_destruct = pppol2tp_session_destruct;
598 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
599 static void pppol2tp_show(struct seq_file *m, void *arg)
601 struct l2tp_session *session = arg;
604 sk = pppol2tp_session_get_sock(session);
606 struct pppox_sock *po = pppox_sk(sk);
608 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
614 static void pppol2tp_session_init(struct l2tp_session *session)
616 struct pppol2tp_session *ps;
617 struct dst_entry *dst;
619 session->recv_skb = pppol2tp_recv;
620 session->session_close = pppol2tp_session_close;
621 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
622 session->show = pppol2tp_show;
625 ps = l2tp_session_priv(session);
626 mutex_init(&ps->sk_lock);
627 ps->tunnel_sock = session->tunnel->sock;
628 ps->owner = current->pid;
630 /* If PMTU discovery was enabled, use the MTU that was discovered */
631 dst = sk_dst_get(session->tunnel->sock);
633 u32 pmtu = dst_mtu(dst);
636 session->mtu = pmtu - PPPOL2TP_HEADER_OVERHEAD;
637 session->mru = pmtu - PPPOL2TP_HEADER_OVERHEAD;
643 /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
645 static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
646 int sockaddr_len, int flags)
648 struct sock *sk = sock->sk;
649 struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr;
650 struct pppox_sock *po = pppox_sk(sk);
651 struct l2tp_session *session = NULL;
652 struct l2tp_tunnel *tunnel;
653 struct pppol2tp_session *ps;
654 struct l2tp_session_cfg cfg = { 0, };
656 u32 tunnel_id, peer_tunnel_id;
657 u32 session_id, peer_session_id;
658 bool drop_refcnt = false;
666 if (sockaddr_len != sizeof(struct sockaddr_pppol2tp) &&
667 sockaddr_len != sizeof(struct sockaddr_pppol2tpv3) &&
668 sockaddr_len != sizeof(struct sockaddr_pppol2tpin6) &&
669 sockaddr_len != sizeof(struct sockaddr_pppol2tpv3in6))
672 if (sp->sa_protocol != PX_PROTO_OL2TP)
675 /* Check for already bound sockets */
677 if (sk->sk_state & PPPOX_CONNECTED)
680 /* We don't supporting rebinding anyway */
682 if (sk->sk_user_data)
683 goto end; /* socket is already attached */
685 /* Get params from socket address. Handle L2TPv2 and L2TPv3.
686 * This is nasty because there are different sockaddr_pppol2tp
687 * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use
688 * the sockaddr size to determine which structure the caller
692 if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) {
693 fd = sp->pppol2tp.fd;
694 tunnel_id = sp->pppol2tp.s_tunnel;
695 peer_tunnel_id = sp->pppol2tp.d_tunnel;
696 session_id = sp->pppol2tp.s_session;
697 peer_session_id = sp->pppol2tp.d_session;
698 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) {
699 struct sockaddr_pppol2tpv3 *sp3 =
700 (struct sockaddr_pppol2tpv3 *) sp;
702 fd = sp3->pppol2tp.fd;
703 tunnel_id = sp3->pppol2tp.s_tunnel;
704 peer_tunnel_id = sp3->pppol2tp.d_tunnel;
705 session_id = sp3->pppol2tp.s_session;
706 peer_session_id = sp3->pppol2tp.d_session;
707 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpin6)) {
708 struct sockaddr_pppol2tpin6 *sp6 =
709 (struct sockaddr_pppol2tpin6 *) sp;
710 fd = sp6->pppol2tp.fd;
711 tunnel_id = sp6->pppol2tp.s_tunnel;
712 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
713 session_id = sp6->pppol2tp.s_session;
714 peer_session_id = sp6->pppol2tp.d_session;
715 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3in6)) {
716 struct sockaddr_pppol2tpv3in6 *sp6 =
717 (struct sockaddr_pppol2tpv3in6 *) sp;
719 fd = sp6->pppol2tp.fd;
720 tunnel_id = sp6->pppol2tp.s_tunnel;
721 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
722 session_id = sp6->pppol2tp.s_session;
723 peer_session_id = sp6->pppol2tp.d_session;
726 goto end; /* bad socket address */
729 /* Don't bind if tunnel_id is 0 */
734 tunnel = l2tp_tunnel_find(sock_net(sk), tunnel_id);
736 /* Special case: create tunnel context if session_id and
737 * peer_session_id is 0. Otherwise look up tunnel using supplied
740 if ((session_id == 0) && (peer_session_id == 0)) {
741 if (tunnel == NULL) {
742 struct l2tp_tunnel_cfg tcfg = {
743 .encap = L2TP_ENCAPTYPE_UDP,
746 error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel);
751 /* Error if we can't find the tunnel */
756 /* Error if socket is not prepped */
757 if (tunnel->sock == NULL)
761 if (tunnel->recv_payload_hook == NULL)
762 tunnel->recv_payload_hook = pppol2tp_recv_payload_hook;
764 if (tunnel->peer_tunnel_id == 0)
765 tunnel->peer_tunnel_id = peer_tunnel_id;
767 session = l2tp_session_get(sock_net(sk), tunnel, session_id, false);
770 ps = l2tp_session_priv(session);
772 /* Using a pre-existing session is fine as long as it hasn't
773 * been connected yet.
775 mutex_lock(&ps->sk_lock);
776 if (rcu_dereference_protected(ps->sk,
777 lockdep_is_held(&ps->sk_lock))) {
778 mutex_unlock(&ps->sk_lock);
783 /* consistency checks */
784 if (ps->tunnel_sock != tunnel->sock) {
785 mutex_unlock(&ps->sk_lock);
790 /* Default MTU must allow space for UDP/L2TP/PPP headers */
791 cfg.mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
794 session = l2tp_session_create(sizeof(struct pppol2tp_session),
796 peer_session_id, &cfg);
797 if (IS_ERR(session)) {
798 error = PTR_ERR(session);
802 pppol2tp_session_init(session);
803 ps = l2tp_session_priv(session);
804 l2tp_session_inc_refcount(session);
806 mutex_lock(&ps->sk_lock);
807 error = l2tp_session_register(session, tunnel);
809 mutex_unlock(&ps->sk_lock);
816 /* Special case: if source & dest session_id == 0x0000, this
817 * socket is being created to manage the tunnel. Just set up
818 * the internal context for use by ioctl() and sockopt()
821 if ((session->session_id == 0) &&
822 (session->peer_session_id == 0)) {
827 /* The only header we need to worry about is the L2TP
828 * header. This size is different depending on whether
829 * sequence numbers are enabled for the data channel.
831 po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
833 po->chan.private = sk;
834 po->chan.ops = &pppol2tp_chan_ops;
835 po->chan.mtu = session->mtu;
837 error = ppp_register_net_channel(sock_net(sk), &po->chan);
839 mutex_unlock(&ps->sk_lock);
844 /* This is how we get the session context from the socket. */
845 sk->sk_user_data = session;
846 rcu_assign_pointer(ps->sk, sk);
847 mutex_unlock(&ps->sk_lock);
849 /* Keep the reference we've grabbed on the session: sk doesn't expect
850 * the session to disappear. pppol2tp_session_destruct() is responsible
855 sk->sk_state = PPPOX_CONNECTED;
856 l2tp_info(session, L2TP_MSG_CONTROL, "%s: created\n",
861 l2tp_session_dec_refcount(session);
867 #ifdef CONFIG_L2TP_V3
869 /* Called when creating sessions via the netlink interface. */
870 static int pppol2tp_session_create(struct net *net, struct l2tp_tunnel *tunnel,
871 u32 session_id, u32 peer_session_id,
872 struct l2tp_session_cfg *cfg)
875 struct l2tp_session *session;
877 /* Error if tunnel socket is not prepped */
883 /* Default MTU values. */
885 cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
889 /* Allocate and initialize a new session context. */
890 session = l2tp_session_create(sizeof(struct pppol2tp_session),
892 peer_session_id, cfg);
893 if (IS_ERR(session)) {
894 error = PTR_ERR(session);
898 pppol2tp_session_init(session);
900 error = l2tp_session_register(session, tunnel);
912 #endif /* CONFIG_L2TP_V3 */
914 /* getname() support.
916 static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
917 int *usockaddr_len, int peer)
921 struct l2tp_session *session;
922 struct l2tp_tunnel *tunnel;
923 struct sock *sk = sock->sk;
924 struct inet_sock *inet;
925 struct pppol2tp_session *pls;
930 if (sk->sk_state != PPPOX_CONNECTED)
934 session = pppol2tp_sock_to_session(sk);
938 pls = l2tp_session_priv(session);
939 tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock);
943 inet = inet_sk(tunnel->sock);
944 if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) {
945 struct sockaddr_pppol2tp sp;
948 sp.sa_family = AF_PPPOX;
949 sp.sa_protocol = PX_PROTO_OL2TP;
950 sp.pppol2tp.fd = tunnel->fd;
951 sp.pppol2tp.pid = pls->owner;
952 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
953 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
954 sp.pppol2tp.s_session = session->session_id;
955 sp.pppol2tp.d_session = session->peer_session_id;
956 sp.pppol2tp.addr.sin_family = AF_INET;
957 sp.pppol2tp.addr.sin_port = inet->inet_dport;
958 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
959 memcpy(uaddr, &sp, len);
960 #if IS_ENABLED(CONFIG_IPV6)
961 } else if ((tunnel->version == 2) &&
962 (tunnel->sock->sk_family == AF_INET6)) {
963 struct sockaddr_pppol2tpin6 sp;
967 sp.sa_family = AF_PPPOX;
968 sp.sa_protocol = PX_PROTO_OL2TP;
969 sp.pppol2tp.fd = tunnel->fd;
970 sp.pppol2tp.pid = pls->owner;
971 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
972 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
973 sp.pppol2tp.s_session = session->session_id;
974 sp.pppol2tp.d_session = session->peer_session_id;
975 sp.pppol2tp.addr.sin6_family = AF_INET6;
976 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
977 memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
978 sizeof(tunnel->sock->sk_v6_daddr));
979 memcpy(uaddr, &sp, len);
980 } else if ((tunnel->version == 3) &&
981 (tunnel->sock->sk_family == AF_INET6)) {
982 struct sockaddr_pppol2tpv3in6 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.sin6_family = AF_INET6;
995 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
996 memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
997 sizeof(tunnel->sock->sk_v6_daddr));
998 memcpy(uaddr, &sp, len);
1000 } else if (tunnel->version == 3) {
1001 struct sockaddr_pppol2tpv3 sp;
1003 memset(&sp, 0, len);
1004 sp.sa_family = AF_PPPOX;
1005 sp.sa_protocol = PX_PROTO_OL2TP;
1006 sp.pppol2tp.fd = tunnel->fd;
1007 sp.pppol2tp.pid = pls->owner;
1008 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
1009 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
1010 sp.pppol2tp.s_session = session->session_id;
1011 sp.pppol2tp.d_session = session->peer_session_id;
1012 sp.pppol2tp.addr.sin_family = AF_INET;
1013 sp.pppol2tp.addr.sin_port = inet->inet_dport;
1014 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
1015 memcpy(uaddr, &sp, len);
1018 *usockaddr_len = len;
1021 sock_put(pls->tunnel_sock);
1028 /****************************************************************************
1031 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1032 * sockets. However, in order to control kernel tunnel features, we allow
1033 * userspace to create a special "tunnel" PPPoX socket which is used for
1034 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
1035 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
1037 ****************************************************************************/
1039 static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest,
1040 struct l2tp_stats *stats)
1042 dest->tx_packets = atomic_long_read(&stats->tx_packets);
1043 dest->tx_bytes = atomic_long_read(&stats->tx_bytes);
1044 dest->tx_errors = atomic_long_read(&stats->tx_errors);
1045 dest->rx_packets = atomic_long_read(&stats->rx_packets);
1046 dest->rx_bytes = atomic_long_read(&stats->rx_bytes);
1047 dest->rx_seq_discards = atomic_long_read(&stats->rx_seq_discards);
1048 dest->rx_oos_packets = atomic_long_read(&stats->rx_oos_packets);
1049 dest->rx_errors = atomic_long_read(&stats->rx_errors);
1052 /* Session ioctl helper.
1054 static int pppol2tp_session_ioctl(struct l2tp_session *session,
1055 unsigned int cmd, unsigned long arg)
1060 int val = (int) arg;
1061 struct pppol2tp_session *ps = l2tp_session_priv(session);
1062 struct l2tp_tunnel *tunnel = session->tunnel;
1063 struct pppol2tp_ioc_stats stats;
1065 l2tp_dbg(session, L2TP_MSG_CONTROL,
1066 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
1067 session->name, cmd, arg);
1069 sk = pppol2tp_session_get_sock(session);
1076 if (!(sk->sk_state & PPPOX_CONNECTED))
1080 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1082 ifr.ifr_mtu = session->mtu;
1083 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
1086 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mtu=%d\n",
1087 session->name, session->mtu);
1093 if (!(sk->sk_state & PPPOX_CONNECTED))
1097 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1100 session->mtu = ifr.ifr_mtu;
1102 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mtu=%d\n",
1103 session->name, session->mtu);
1109 if (!(sk->sk_state & PPPOX_CONNECTED))
1113 if (put_user(session->mru, (int __user *) arg))
1116 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mru=%d\n",
1117 session->name, session->mru);
1123 if (!(sk->sk_state & PPPOX_CONNECTED))
1127 if (get_user(val, (int __user *) arg))
1131 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mru=%d\n",
1132 session->name, session->mru);
1138 if (put_user(ps->flags, (int __user *) arg))
1141 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get flags=%d\n",
1142 session->name, ps->flags);
1148 if (get_user(val, (int __user *) arg))
1151 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set flags=%d\n",
1152 session->name, ps->flags);
1156 case PPPIOCGL2TPSTATS:
1158 if (!(sk->sk_state & PPPOX_CONNECTED))
1161 memset(&stats, 0, sizeof(stats));
1162 stats.tunnel_id = tunnel->tunnel_id;
1163 stats.session_id = session->session_id;
1164 pppol2tp_copy_stats(&stats, &session->stats);
1165 if (copy_to_user((void __user *) arg, &stats,
1168 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1183 /* Tunnel ioctl helper.
1185 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1186 * specifies a session_id, the session ioctl handler is called. This allows an
1187 * application to retrieve session stats via a tunnel socket.
1189 static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
1190 unsigned int cmd, unsigned long arg)
1194 struct pppol2tp_ioc_stats stats;
1196 l2tp_dbg(tunnel, L2TP_MSG_CONTROL,
1197 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1198 tunnel->name, cmd, arg);
1204 case PPPIOCGL2TPSTATS:
1206 if (!(sk->sk_state & PPPOX_CONNECTED))
1209 if (copy_from_user(&stats, (void __user *) arg,
1214 if (stats.session_id != 0) {
1215 /* resend to session ioctl handler */
1216 struct l2tp_session *session =
1217 l2tp_session_get(sock_net(sk), tunnel,
1218 stats.session_id, true);
1221 err = pppol2tp_session_ioctl(session, cmd,
1224 session->deref(session);
1225 l2tp_session_dec_refcount(session);
1232 stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
1234 pppol2tp_copy_stats(&stats, &tunnel->stats);
1235 if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) {
1239 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1254 /* Main ioctl() handler.
1255 * Dispatch to tunnel or session helpers depending on the socket.
1257 static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
1260 struct sock *sk = sock->sk;
1261 struct l2tp_session *session;
1262 struct l2tp_tunnel *tunnel;
1263 struct pppol2tp_session *ps;
1270 if (sock_flag(sk, SOCK_DEAD) != 0)
1274 if ((sk->sk_user_data == NULL) ||
1275 (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
1278 /* Get session context from the socket */
1280 session = pppol2tp_sock_to_session(sk);
1281 if (session == NULL)
1284 /* Special case: if session's session_id is zero, treat ioctl as a
1287 ps = l2tp_session_priv(session);
1288 if ((session->session_id == 0) &&
1289 (session->peer_session_id == 0)) {
1291 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1295 err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
1296 sock_put(ps->tunnel_sock);
1300 err = pppol2tp_session_ioctl(session, cmd, arg);
1308 /*****************************************************************************
1309 * setsockopt() / getsockopt() support.
1311 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1312 * sockets. In order to control kernel tunnel features, we allow userspace to
1313 * create a special "tunnel" PPPoX socket which is used for control only.
1314 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1315 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1316 *****************************************************************************/
1318 /* Tunnel setsockopt() helper.
1320 static int pppol2tp_tunnel_setsockopt(struct sock *sk,
1321 struct l2tp_tunnel *tunnel,
1322 int optname, int val)
1327 case PPPOL2TP_SO_DEBUG:
1328 tunnel->debug = val;
1329 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: set debug=%x\n",
1330 tunnel->name, tunnel->debug);
1341 /* Session setsockopt helper.
1343 static int pppol2tp_session_setsockopt(struct sock *sk,
1344 struct l2tp_session *session,
1345 int optname, int val)
1350 case PPPOL2TP_SO_RECVSEQ:
1351 if ((val != 0) && (val != 1)) {
1355 session->recv_seq = val ? -1 : 0;
1356 l2tp_info(session, L2TP_MSG_CONTROL,
1357 "%s: set recv_seq=%d\n",
1358 session->name, session->recv_seq);
1361 case PPPOL2TP_SO_SENDSEQ:
1362 if ((val != 0) && (val != 1)) {
1366 session->send_seq = val ? -1 : 0;
1368 struct pppox_sock *po = pppox_sk(sk);
1370 po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
1371 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1373 l2tp_session_set_header_len(session, session->tunnel->version);
1374 l2tp_info(session, L2TP_MSG_CONTROL,
1375 "%s: set send_seq=%d\n",
1376 session->name, session->send_seq);
1379 case PPPOL2TP_SO_LNSMODE:
1380 if ((val != 0) && (val != 1)) {
1384 session->lns_mode = val ? -1 : 0;
1385 l2tp_info(session, L2TP_MSG_CONTROL,
1386 "%s: set lns_mode=%d\n",
1387 session->name, session->lns_mode);
1390 case PPPOL2TP_SO_DEBUG:
1391 session->debug = val;
1392 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set debug=%x\n",
1393 session->name, session->debug);
1396 case PPPOL2TP_SO_REORDERTO:
1397 session->reorder_timeout = msecs_to_jiffies(val);
1398 l2tp_info(session, L2TP_MSG_CONTROL,
1399 "%s: set reorder_timeout=%d\n",
1400 session->name, session->reorder_timeout);
1411 /* Main setsockopt() entry point.
1412 * Does API checks, then calls either the tunnel or session setsockopt
1413 * handler, according to whether the PPPoL2TP socket is a for a regular
1414 * session or the special tunnel type.
1416 static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
1417 char __user *optval, unsigned int optlen)
1419 struct sock *sk = sock->sk;
1420 struct l2tp_session *session;
1421 struct l2tp_tunnel *tunnel;
1422 struct pppol2tp_session *ps;
1426 if (level != SOL_PPPOL2TP)
1429 if (optlen < sizeof(int))
1432 if (get_user(val, (int __user *)optval))
1436 if (sk->sk_user_data == NULL)
1439 /* Get session context from the socket */
1441 session = pppol2tp_sock_to_session(sk);
1442 if (session == NULL)
1445 /* Special case: if session_id == 0x0000, treat as operation on tunnel
1447 ps = l2tp_session_priv(session);
1448 if ((session->session_id == 0) &&
1449 (session->peer_session_id == 0)) {
1451 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1455 err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
1456 sock_put(ps->tunnel_sock);
1458 err = pppol2tp_session_setsockopt(sk, session, optname, val);
1468 /* Tunnel getsockopt helper. Called with sock locked.
1470 static int pppol2tp_tunnel_getsockopt(struct sock *sk,
1471 struct l2tp_tunnel *tunnel,
1472 int optname, int *val)
1477 case PPPOL2TP_SO_DEBUG:
1478 *val = tunnel->debug;
1479 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get debug=%x\n",
1480 tunnel->name, tunnel->debug);
1491 /* Session getsockopt helper. Called with sock locked.
1493 static int pppol2tp_session_getsockopt(struct sock *sk,
1494 struct l2tp_session *session,
1495 int optname, int *val)
1500 case PPPOL2TP_SO_RECVSEQ:
1501 *val = session->recv_seq;
1502 l2tp_info(session, L2TP_MSG_CONTROL,
1503 "%s: get recv_seq=%d\n", session->name, *val);
1506 case PPPOL2TP_SO_SENDSEQ:
1507 *val = session->send_seq;
1508 l2tp_info(session, L2TP_MSG_CONTROL,
1509 "%s: get send_seq=%d\n", session->name, *val);
1512 case PPPOL2TP_SO_LNSMODE:
1513 *val = session->lns_mode;
1514 l2tp_info(session, L2TP_MSG_CONTROL,
1515 "%s: get lns_mode=%d\n", session->name, *val);
1518 case PPPOL2TP_SO_DEBUG:
1519 *val = session->debug;
1520 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get debug=%d\n",
1521 session->name, *val);
1524 case PPPOL2TP_SO_REORDERTO:
1525 *val = (int) jiffies_to_msecs(session->reorder_timeout);
1526 l2tp_info(session, L2TP_MSG_CONTROL,
1527 "%s: get reorder_timeout=%d\n", session->name, *val);
1537 /* Main getsockopt() entry point.
1538 * Does API checks, then calls either the tunnel or session getsockopt
1539 * handler, according to whether the PPPoX socket is a for a regular session
1540 * or the special tunnel type.
1542 static int pppol2tp_getsockopt(struct socket *sock, int level, int optname,
1543 char __user *optval, int __user *optlen)
1545 struct sock *sk = sock->sk;
1546 struct l2tp_session *session;
1547 struct l2tp_tunnel *tunnel;
1550 struct pppol2tp_session *ps;
1552 if (level != SOL_PPPOL2TP)
1555 if (get_user(len, optlen))
1558 len = min_t(unsigned int, len, sizeof(int));
1564 if (sk->sk_user_data == NULL)
1567 /* Get the session context */
1569 session = pppol2tp_sock_to_session(sk);
1570 if (session == NULL)
1573 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1574 ps = l2tp_session_priv(session);
1575 if ((session->session_id == 0) &&
1576 (session->peer_session_id == 0)) {
1578 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1582 err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
1583 sock_put(ps->tunnel_sock);
1585 err = pppol2tp_session_getsockopt(sk, session, optname, &val);
1588 if (put_user(len, optlen))
1591 if (copy_to_user((void __user *) optval, &val, len))
1602 /*****************************************************************************
1603 * /proc filesystem for debug
1604 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1605 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1606 *****************************************************************************/
1608 static unsigned int pppol2tp_net_id;
1610 #ifdef CONFIG_PROC_FS
1612 struct pppol2tp_seq_data {
1613 struct seq_net_private p;
1614 int tunnel_idx; /* current tunnel */
1615 int session_idx; /* index of session within current tunnel */
1616 struct l2tp_tunnel *tunnel;
1617 struct l2tp_session *session; /* NULL means get next tunnel */
1620 static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
1623 pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx);
1626 if (pd->tunnel == NULL)
1629 /* Ignore L2TPv3 tunnels */
1630 if (pd->tunnel->version < 3)
1635 static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
1637 pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx, true);
1640 if (pd->session == NULL) {
1641 pd->session_idx = 0;
1642 pppol2tp_next_tunnel(net, pd);
1646 static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
1648 struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
1655 BUG_ON(m->private == NULL);
1657 net = seq_file_net(m);
1659 if (pd->tunnel == NULL)
1660 pppol2tp_next_tunnel(net, pd);
1662 pppol2tp_next_session(net, pd);
1664 /* NULL tunnel and session indicates end of list */
1665 if ((pd->tunnel == NULL) && (pd->session == NULL))
1672 static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
1678 static void pppol2tp_seq_stop(struct seq_file *p, void *v)
1683 static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
1685 struct l2tp_tunnel *tunnel = v;
1687 seq_printf(m, "\nTUNNEL '%s', %c %d\n",
1689 (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
1690 atomic_read(&tunnel->ref_count) - 1);
1691 seq_printf(m, " %08x %ld/%ld/%ld %ld/%ld/%ld\n",
1693 atomic_long_read(&tunnel->stats.tx_packets),
1694 atomic_long_read(&tunnel->stats.tx_bytes),
1695 atomic_long_read(&tunnel->stats.tx_errors),
1696 atomic_long_read(&tunnel->stats.rx_packets),
1697 atomic_long_read(&tunnel->stats.rx_bytes),
1698 atomic_long_read(&tunnel->stats.rx_errors));
1701 static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
1703 struct l2tp_session *session = v;
1704 struct l2tp_tunnel *tunnel = session->tunnel;
1705 unsigned char state;
1712 struct inet_sock *inet = inet_sk(tunnel->sock);
1713 ip = ntohl(inet->inet_saddr);
1714 port = ntohs(inet->inet_sport);
1717 sk = pppol2tp_session_get_sock(session);
1719 state = sk->sk_state;
1720 user_data_ok = (session == sk->sk_user_data) ? 'Y' : 'N';
1726 seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
1727 "%04X/%04X %d %c\n",
1728 session->name, ip, port,
1730 session->session_id,
1731 tunnel->peer_tunnel_id,
1732 session->peer_session_id,
1733 state, user_data_ok);
1734 seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n",
1735 session->mtu, session->mru,
1736 session->recv_seq ? 'R' : '-',
1737 session->send_seq ? 'S' : '-',
1738 session->lns_mode ? "LNS" : "LAC",
1740 jiffies_to_msecs(session->reorder_timeout));
1741 seq_printf(m, " %hu/%hu %ld/%ld/%ld %ld/%ld/%ld\n",
1742 session->nr, session->ns,
1743 atomic_long_read(&session->stats.tx_packets),
1744 atomic_long_read(&session->stats.tx_bytes),
1745 atomic_long_read(&session->stats.tx_errors),
1746 atomic_long_read(&session->stats.rx_packets),
1747 atomic_long_read(&session->stats.rx_bytes),
1748 atomic_long_read(&session->stats.rx_errors));
1751 struct pppox_sock *po = pppox_sk(sk);
1753 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
1758 static int pppol2tp_seq_show(struct seq_file *m, void *v)
1760 struct pppol2tp_seq_data *pd = v;
1762 /* display header on line 1 */
1763 if (v == SEQ_START_TOKEN) {
1764 seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
1765 seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
1766 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1767 seq_puts(m, " SESSION name, addr/port src-tid/sid "
1768 "dest-tid/sid state user-data-ok\n");
1769 seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1770 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1774 /* Show the tunnel or session context.
1777 pppol2tp_seq_tunnel_show(m, pd->tunnel);
1779 pppol2tp_seq_session_show(m, pd->session);
1780 if (pd->session->deref)
1781 pd->session->deref(pd->session);
1782 l2tp_session_dec_refcount(pd->session);
1789 static const struct seq_operations pppol2tp_seq_ops = {
1790 .start = pppol2tp_seq_start,
1791 .next = pppol2tp_seq_next,
1792 .stop = pppol2tp_seq_stop,
1793 .show = pppol2tp_seq_show,
1796 /* Called when our /proc file is opened. We allocate data for use when
1797 * iterating our tunnel / session contexts and store it in the private
1798 * data of the seq_file.
1800 static int pppol2tp_proc_open(struct inode *inode, struct file *file)
1802 return seq_open_net(inode, file, &pppol2tp_seq_ops,
1803 sizeof(struct pppol2tp_seq_data));
1806 static const struct file_operations pppol2tp_proc_fops = {
1807 .owner = THIS_MODULE,
1808 .open = pppol2tp_proc_open,
1810 .llseek = seq_lseek,
1811 .release = seq_release_net,
1814 #endif /* CONFIG_PROC_FS */
1816 /*****************************************************************************
1818 *****************************************************************************/
1820 static __net_init int pppol2tp_init_net(struct net *net)
1822 struct proc_dir_entry *pde;
1825 pde = proc_create("pppol2tp", S_IRUGO, net->proc_net,
1826 &pppol2tp_proc_fops);
1836 static __net_exit void pppol2tp_exit_net(struct net *net)
1838 remove_proc_entry("pppol2tp", net->proc_net);
1841 static struct pernet_operations pppol2tp_net_ops = {
1842 .init = pppol2tp_init_net,
1843 .exit = pppol2tp_exit_net,
1844 .id = &pppol2tp_net_id,
1847 /*****************************************************************************
1849 *****************************************************************************/
1851 static const struct proto_ops pppol2tp_ops = {
1853 .owner = THIS_MODULE,
1854 .release = pppol2tp_release,
1855 .bind = sock_no_bind,
1856 .connect = pppol2tp_connect,
1857 .socketpair = sock_no_socketpair,
1858 .accept = sock_no_accept,
1859 .getname = pppol2tp_getname,
1860 .poll = datagram_poll,
1861 .listen = sock_no_listen,
1862 .shutdown = sock_no_shutdown,
1863 .setsockopt = pppol2tp_setsockopt,
1864 .getsockopt = pppol2tp_getsockopt,
1865 .sendmsg = pppol2tp_sendmsg,
1866 .recvmsg = pppol2tp_recvmsg,
1867 .mmap = sock_no_mmap,
1868 .ioctl = pppox_ioctl,
1869 #ifdef CONFIG_COMPAT
1870 .compat_ioctl = pppox_compat_ioctl,
1874 static const struct pppox_proto pppol2tp_proto = {
1875 .create = pppol2tp_create,
1876 .ioctl = pppol2tp_ioctl,
1877 .owner = THIS_MODULE,
1880 #ifdef CONFIG_L2TP_V3
1882 static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = {
1883 .session_create = pppol2tp_session_create,
1884 .session_delete = l2tp_session_delete,
1887 #endif /* CONFIG_L2TP_V3 */
1889 static int __init pppol2tp_init(void)
1893 err = register_pernet_device(&pppol2tp_net_ops);
1897 err = proto_register(&pppol2tp_sk_proto, 0);
1899 goto out_unregister_pppol2tp_pernet;
1901 err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
1903 goto out_unregister_pppol2tp_proto;
1905 #ifdef CONFIG_L2TP_V3
1906 err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops);
1908 goto out_unregister_pppox;
1911 pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION);
1916 #ifdef CONFIG_L2TP_V3
1917 out_unregister_pppox:
1918 unregister_pppox_proto(PX_PROTO_OL2TP);
1920 out_unregister_pppol2tp_proto:
1921 proto_unregister(&pppol2tp_sk_proto);
1922 out_unregister_pppol2tp_pernet:
1923 unregister_pernet_device(&pppol2tp_net_ops);
1927 static void __exit pppol2tp_exit(void)
1929 #ifdef CONFIG_L2TP_V3
1930 l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP);
1932 unregister_pppox_proto(PX_PROTO_OL2TP);
1933 proto_unregister(&pppol2tp_sk_proto);
1934 unregister_pernet_device(&pppol2tp_net_ops);
1937 module_init(pppol2tp_init);
1938 module_exit(pppol2tp_exit);
1940 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1941 MODULE_DESCRIPTION("PPP over L2TP over UDP");
1942 MODULE_LICENSE("GPL");
1943 MODULE_VERSION(PPPOL2TP_DRV_VERSION);
1944 MODULE_ALIAS("pppox-proto-" __stringify(PX_PROTO_OL2TP));
1945 MODULE_ALIAS_L2TP_PWTYPE(7);