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 int flags; /* accessed by PPPIOCGFLAGS.
134 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb);
136 static const struct ppp_channel_ops pppol2tp_chan_ops = {
137 .start_xmit = pppol2tp_xmit,
140 static const struct proto_ops pppol2tp_ops;
142 /* Retrieves the pppol2tp socket associated to a session.
143 * A reference is held on the returned socket, so this function must be paired
146 static struct sock *pppol2tp_session_get_sock(struct l2tp_session *session)
148 struct pppol2tp_session *ps = l2tp_session_priv(session);
152 sk = rcu_dereference(ps->sk);
160 /* Helpers to obtain tunnel/session contexts from sockets.
162 static inline struct l2tp_session *pppol2tp_sock_to_session(struct sock *sk)
164 struct l2tp_session *session;
170 session = (struct l2tp_session *)(sk->sk_user_data);
171 if (session == NULL) {
176 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
182 /*****************************************************************************
183 * Receive data handling
184 *****************************************************************************/
186 static int pppol2tp_recv_payload_hook(struct sk_buff *skb)
188 /* Skip PPP header, if present. In testing, Microsoft L2TP clients
189 * don't send the PPP header (PPP header compression enabled), but
190 * other clients can include the header. So we cope with both cases
191 * here. The PPP header is always FF03 when using L2TP.
193 * Note that skb->data[] isn't dereferenced from a u16 ptr here since
194 * the field may be unaligned.
196 if (!pskb_may_pull(skb, 2))
199 if ((skb->data[0] == PPP_ALLSTATIONS) && (skb->data[1] == PPP_UI))
205 /* Receive message. This is the recvmsg for the PPPoL2TP socket.
207 static int pppol2tp_recvmsg(struct socket *sock, struct msghdr *msg,
208 size_t len, int flags)
212 struct sock *sk = sock->sk;
215 if (sk->sk_state & PPPOX_BOUND)
219 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
220 flags & MSG_DONTWAIT, &err);
226 else if (len < skb->len)
227 msg->msg_flags |= MSG_TRUNC;
229 err = skb_copy_datagram_msg(skb, 0, msg, len);
230 if (likely(err == 0))
238 static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
240 struct pppol2tp_session *ps = l2tp_session_priv(session);
241 struct sock *sk = NULL;
243 /* If the socket is bound, send it in to PPP's input queue. Otherwise
244 * queue it on the session socket.
247 sk = rcu_dereference(ps->sk);
251 if (sk->sk_state & PPPOX_BOUND) {
252 struct pppox_sock *po;
254 l2tp_dbg(session, L2TP_MSG_DATA,
255 "%s: recv %d byte data frame, passing to ppp\n",
256 session->name, data_len);
259 ppp_input(&po->chan, skb);
261 l2tp_dbg(session, L2TP_MSG_DATA,
262 "%s: recv %d byte data frame, passing to L2TP socket\n",
263 session->name, data_len);
265 if (sock_queue_rcv_skb(sk, skb) < 0) {
266 atomic_long_inc(&session->stats.rx_errors);
276 l2tp_info(session, L2TP_MSG_DATA, "%s: no socket\n", session->name);
280 /************************************************************************
282 ***********************************************************************/
284 /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here
285 * when a user application does a sendmsg() on the session socket. L2TP and
286 * PPP headers must be inserted into the user's data.
288 static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m,
291 struct sock *sk = sock->sk;
294 struct l2tp_session *session;
295 struct l2tp_tunnel *tunnel;
299 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
302 /* Get session and tunnel contexts */
304 session = pppol2tp_sock_to_session(sk);
308 tunnel = session->tunnel;
310 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
312 /* Allocate a socket buffer */
314 skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) +
315 uhlen + session->hdr_len +
316 2 + total_len, /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */
321 /* Reserve space for headers. */
322 skb_reserve(skb, NET_SKB_PAD);
323 skb_reset_network_header(skb);
324 skb_reserve(skb, sizeof(struct iphdr));
325 skb_reset_transport_header(skb);
326 skb_reserve(skb, uhlen);
329 skb->data[0] = PPP_ALLSTATIONS;
330 skb->data[1] = PPP_UI;
333 /* Copy user data into skb */
334 error = memcpy_from_msg(skb_put(skb, total_len), m, total_len);
341 l2tp_xmit_skb(session, skb, session->hdr_len);
354 /* Transmit function called by generic PPP driver. Sends PPP frame
355 * over PPPoL2TP socket.
357 * This is almost the same as pppol2tp_sendmsg(), but rather than
358 * being called with a msghdr from userspace, it is called with a skb
361 * The supplied skb from ppp doesn't have enough headroom for the
362 * insertion of L2TP, UDP and IP headers so we need to allocate more
363 * headroom in the skb. This will create a cloned skb. But we must be
364 * careful in the error case because the caller will expect to free
365 * the skb it supplied, not our cloned skb. So we take care to always
366 * leave the original skb unfreed if we return an error.
368 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
370 struct sock *sk = (struct sock *) chan->private;
371 struct l2tp_session *session;
372 struct l2tp_tunnel *tunnel;
375 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
378 /* Get session and tunnel contexts from the socket */
379 session = pppol2tp_sock_to_session(sk);
383 tunnel = session->tunnel;
385 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
386 headroom = NET_SKB_PAD +
387 sizeof(struct iphdr) + /* IP header */
388 uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */
389 session->hdr_len + /* L2TP header */
390 2; /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */
391 if (skb_cow_head(skb, headroom))
394 /* Setup PPP header */
396 skb->data[0] = PPP_ALLSTATIONS;
397 skb->data[1] = PPP_UI;
400 l2tp_xmit_skb(session, skb, session->hdr_len);
410 /* Free the original skb */
415 /*****************************************************************************
416 * Session (and tunnel control) socket create/destroy.
417 *****************************************************************************/
419 static void pppol2tp_put_sk(struct rcu_head *head)
421 struct pppol2tp_session *ps;
423 ps = container_of(head, typeof(*ps), rcu);
427 /* Called by l2tp_core when a session socket is being closed.
429 static void pppol2tp_session_close(struct l2tp_session *session)
431 struct pppol2tp_session *ps;
433 ps = l2tp_session_priv(session);
434 mutex_lock(&ps->sk_lock);
435 ps->__sk = rcu_dereference_protected(ps->sk,
436 lockdep_is_held(&ps->sk_lock));
437 RCU_INIT_POINTER(ps->sk, NULL);
439 call_rcu(&ps->rcu, pppol2tp_put_sk);
440 mutex_unlock(&ps->sk_lock);
443 /* Really kill the session socket. (Called from sock_put() if
446 static void pppol2tp_session_destruct(struct sock *sk)
448 struct l2tp_session *session = sk->sk_user_data;
450 skb_queue_purge(&sk->sk_receive_queue);
451 skb_queue_purge(&sk->sk_write_queue);
454 sk->sk_user_data = NULL;
455 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
456 l2tp_session_dec_refcount(session);
460 /* Called when the PPPoX socket (session) is closed.
462 static int pppol2tp_release(struct socket *sock)
464 struct sock *sk = sock->sk;
465 struct l2tp_session *session;
473 if (sock_flag(sk, SOCK_DEAD) != 0)
476 pppox_unbind_sock(sk);
478 /* Signal the death of the socket. */
479 sk->sk_state = PPPOX_DEAD;
483 /* If the socket is associated with a session,
484 * l2tp_session_delete will call pppol2tp_session_close which
485 * will drop the session's ref on the socket.
487 session = pppol2tp_sock_to_session(sk);
489 l2tp_session_delete(session);
490 /* drop the ref obtained by pppol2tp_sock_to_session */
496 /* This will delete the session context via
497 * pppol2tp_session_destruct() if the socket's refcnt drops to
509 static struct proto pppol2tp_sk_proto = {
511 .owner = THIS_MODULE,
512 .obj_size = sizeof(struct pppox_sock),
515 static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb)
519 rc = l2tp_udp_encap_recv(sk, skb);
523 return NET_RX_SUCCESS;
526 /* socket() handler. Initialize a new struct sock.
528 static int pppol2tp_create(struct net *net, struct socket *sock, int kern)
533 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto, kern);
537 sock_init_data(sock, sk);
539 sock->state = SS_UNCONNECTED;
540 sock->ops = &pppol2tp_ops;
542 sk->sk_backlog_rcv = pppol2tp_backlog_recv;
543 sk->sk_protocol = PX_PROTO_OL2TP;
544 sk->sk_family = PF_PPPOX;
545 sk->sk_state = PPPOX_NONE;
546 sk->sk_type = SOCK_STREAM;
547 sk->sk_destruct = pppol2tp_session_destruct;
555 #if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
556 static void pppol2tp_show(struct seq_file *m, void *arg)
558 struct l2tp_session *session = arg;
561 sk = pppol2tp_session_get_sock(session);
563 struct pppox_sock *po = pppox_sk(sk);
565 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
571 static void pppol2tp_session_init(struct l2tp_session *session)
573 struct pppol2tp_session *ps;
574 struct dst_entry *dst;
576 session->recv_skb = pppol2tp_recv;
577 session->session_close = pppol2tp_session_close;
578 #if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
579 session->show = pppol2tp_show;
582 ps = l2tp_session_priv(session);
583 mutex_init(&ps->sk_lock);
584 ps->owner = current->pid;
586 /* If PMTU discovery was enabled, use the MTU that was discovered */
587 dst = sk_dst_get(session->tunnel->sock);
589 u32 pmtu = dst_mtu(dst);
592 session->mtu = pmtu - PPPOL2TP_HEADER_OVERHEAD;
593 session->mru = pmtu - PPPOL2TP_HEADER_OVERHEAD;
599 /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
601 static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
602 int sockaddr_len, int flags)
604 struct sock *sk = sock->sk;
605 struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr;
606 struct pppox_sock *po = pppox_sk(sk);
607 struct l2tp_session *session = NULL;
608 struct l2tp_tunnel *tunnel;
609 struct pppol2tp_session *ps;
610 struct l2tp_session_cfg cfg = { 0, };
612 u32 tunnel_id, peer_tunnel_id;
613 u32 session_id, peer_session_id;
614 bool drop_refcnt = false;
615 bool drop_tunnel = false;
622 if (sp->sa_protocol != PX_PROTO_OL2TP)
625 /* Check for already bound sockets */
627 if (sk->sk_state & PPPOX_CONNECTED)
630 /* We don't supporting rebinding anyway */
632 if (sk->sk_user_data)
633 goto end; /* socket is already attached */
635 /* Get params from socket address. Handle L2TPv2 and L2TPv3.
636 * This is nasty because there are different sockaddr_pppol2tp
637 * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use
638 * the sockaddr size to determine which structure the caller
642 if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) {
643 fd = sp->pppol2tp.fd;
644 tunnel_id = sp->pppol2tp.s_tunnel;
645 peer_tunnel_id = sp->pppol2tp.d_tunnel;
646 session_id = sp->pppol2tp.s_session;
647 peer_session_id = sp->pppol2tp.d_session;
648 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) {
649 struct sockaddr_pppol2tpv3 *sp3 =
650 (struct sockaddr_pppol2tpv3 *) sp;
652 fd = sp3->pppol2tp.fd;
653 tunnel_id = sp3->pppol2tp.s_tunnel;
654 peer_tunnel_id = sp3->pppol2tp.d_tunnel;
655 session_id = sp3->pppol2tp.s_session;
656 peer_session_id = sp3->pppol2tp.d_session;
657 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpin6)) {
658 struct sockaddr_pppol2tpin6 *sp6 =
659 (struct sockaddr_pppol2tpin6 *) sp;
660 fd = sp6->pppol2tp.fd;
661 tunnel_id = sp6->pppol2tp.s_tunnel;
662 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
663 session_id = sp6->pppol2tp.s_session;
664 peer_session_id = sp6->pppol2tp.d_session;
665 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3in6)) {
666 struct sockaddr_pppol2tpv3in6 *sp6 =
667 (struct sockaddr_pppol2tpv3in6 *) sp;
669 fd = sp6->pppol2tp.fd;
670 tunnel_id = sp6->pppol2tp.s_tunnel;
671 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
672 session_id = sp6->pppol2tp.s_session;
673 peer_session_id = sp6->pppol2tp.d_session;
676 goto end; /* bad socket address */
679 /* Don't bind if tunnel_id is 0 */
684 tunnel = l2tp_tunnel_get(sock_net(sk), tunnel_id);
688 /* Special case: create tunnel context if session_id and
689 * peer_session_id is 0. Otherwise look up tunnel using supplied
692 if ((session_id == 0) && (peer_session_id == 0)) {
693 if (tunnel == NULL) {
694 struct l2tp_tunnel_cfg tcfg = {
695 .encap = L2TP_ENCAPTYPE_UDP,
698 error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel);
703 /* Error if we can't find the tunnel */
708 /* Error if socket is not prepped */
709 if (tunnel->sock == NULL)
713 if (tunnel->recv_payload_hook == NULL)
714 tunnel->recv_payload_hook = pppol2tp_recv_payload_hook;
716 if (tunnel->peer_tunnel_id == 0)
717 tunnel->peer_tunnel_id = peer_tunnel_id;
719 session = l2tp_session_get(sock_net(sk), tunnel, session_id);
722 ps = l2tp_session_priv(session);
724 /* Using a pre-existing session is fine as long as it hasn't
725 * been connected yet.
727 mutex_lock(&ps->sk_lock);
728 if (rcu_dereference_protected(ps->sk,
729 lockdep_is_held(&ps->sk_lock))) {
730 mutex_unlock(&ps->sk_lock);
735 /* Default MTU must allow space for UDP/L2TP/PPP headers */
736 cfg.mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
739 session = l2tp_session_create(sizeof(struct pppol2tp_session),
741 peer_session_id, &cfg);
742 if (IS_ERR(session)) {
743 error = PTR_ERR(session);
747 pppol2tp_session_init(session);
748 ps = l2tp_session_priv(session);
749 l2tp_session_inc_refcount(session);
751 mutex_lock(&ps->sk_lock);
752 error = l2tp_session_register(session, tunnel);
754 mutex_unlock(&ps->sk_lock);
761 /* Special case: if source & dest session_id == 0x0000, this
762 * socket is being created to manage the tunnel. Just set up
763 * the internal context for use by ioctl() and sockopt()
766 if ((session->session_id == 0) &&
767 (session->peer_session_id == 0)) {
772 /* The only header we need to worry about is the L2TP
773 * header. This size is different depending on whether
774 * sequence numbers are enabled for the data channel.
776 po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
778 po->chan.private = sk;
779 po->chan.ops = &pppol2tp_chan_ops;
780 po->chan.mtu = session->mtu;
782 error = ppp_register_net_channel(sock_net(sk), &po->chan);
784 mutex_unlock(&ps->sk_lock);
789 /* This is how we get the session context from the socket. */
791 sk->sk_user_data = session;
792 rcu_assign_pointer(ps->sk, sk);
793 mutex_unlock(&ps->sk_lock);
795 /* Keep the reference we've grabbed on the session: sk doesn't expect
796 * the session to disappear. pppol2tp_session_destruct() is responsible
801 sk->sk_state = PPPOX_CONNECTED;
802 l2tp_info(session, L2TP_MSG_CONTROL, "%s: created\n",
807 l2tp_session_dec_refcount(session);
809 l2tp_tunnel_dec_refcount(tunnel);
815 #ifdef CONFIG_L2TP_V3
817 /* Called when creating sessions via the netlink interface. */
818 static int pppol2tp_session_create(struct net *net, struct l2tp_tunnel *tunnel,
819 u32 session_id, u32 peer_session_id,
820 struct l2tp_session_cfg *cfg)
823 struct l2tp_session *session;
825 /* Error if tunnel socket is not prepped */
831 /* Default MTU values. */
833 cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
837 /* Allocate and initialize a new session context. */
838 session = l2tp_session_create(sizeof(struct pppol2tp_session),
840 peer_session_id, cfg);
841 if (IS_ERR(session)) {
842 error = PTR_ERR(session);
846 pppol2tp_session_init(session);
848 error = l2tp_session_register(session, tunnel);
860 #endif /* CONFIG_L2TP_V3 */
862 /* getname() support.
864 static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
869 struct l2tp_session *session;
870 struct l2tp_tunnel *tunnel;
871 struct sock *sk = sock->sk;
872 struct inet_sock *inet;
873 struct pppol2tp_session *pls;
878 if (!(sk->sk_state & PPPOX_CONNECTED))
882 session = pppol2tp_sock_to_session(sk);
886 pls = l2tp_session_priv(session);
887 tunnel = session->tunnel;
889 inet = inet_sk(tunnel->sock);
890 if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) {
891 struct sockaddr_pppol2tp sp;
894 sp.sa_family = AF_PPPOX;
895 sp.sa_protocol = PX_PROTO_OL2TP;
896 sp.pppol2tp.fd = tunnel->fd;
897 sp.pppol2tp.pid = pls->owner;
898 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
899 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
900 sp.pppol2tp.s_session = session->session_id;
901 sp.pppol2tp.d_session = session->peer_session_id;
902 sp.pppol2tp.addr.sin_family = AF_INET;
903 sp.pppol2tp.addr.sin_port = inet->inet_dport;
904 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
905 memcpy(uaddr, &sp, len);
906 #if IS_ENABLED(CONFIG_IPV6)
907 } else if ((tunnel->version == 2) &&
908 (tunnel->sock->sk_family == AF_INET6)) {
909 struct sockaddr_pppol2tpin6 sp;
913 sp.sa_family = AF_PPPOX;
914 sp.sa_protocol = PX_PROTO_OL2TP;
915 sp.pppol2tp.fd = tunnel->fd;
916 sp.pppol2tp.pid = pls->owner;
917 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
918 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
919 sp.pppol2tp.s_session = session->session_id;
920 sp.pppol2tp.d_session = session->peer_session_id;
921 sp.pppol2tp.addr.sin6_family = AF_INET6;
922 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
923 memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
924 sizeof(tunnel->sock->sk_v6_daddr));
925 memcpy(uaddr, &sp, len);
926 } else if ((tunnel->version == 3) &&
927 (tunnel->sock->sk_family == AF_INET6)) {
928 struct sockaddr_pppol2tpv3in6 sp;
932 sp.sa_family = AF_PPPOX;
933 sp.sa_protocol = PX_PROTO_OL2TP;
934 sp.pppol2tp.fd = tunnel->fd;
935 sp.pppol2tp.pid = pls->owner;
936 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
937 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
938 sp.pppol2tp.s_session = session->session_id;
939 sp.pppol2tp.d_session = session->peer_session_id;
940 sp.pppol2tp.addr.sin6_family = AF_INET6;
941 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
942 memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
943 sizeof(tunnel->sock->sk_v6_daddr));
944 memcpy(uaddr, &sp, len);
946 } else if (tunnel->version == 3) {
947 struct sockaddr_pppol2tpv3 sp;
950 sp.sa_family = AF_PPPOX;
951 sp.sa_protocol = PX_PROTO_OL2TP;
952 sp.pppol2tp.fd = tunnel->fd;
953 sp.pppol2tp.pid = pls->owner;
954 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
955 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
956 sp.pppol2tp.s_session = session->session_id;
957 sp.pppol2tp.d_session = session->peer_session_id;
958 sp.pppol2tp.addr.sin_family = AF_INET;
959 sp.pppol2tp.addr.sin_port = inet->inet_dport;
960 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
961 memcpy(uaddr, &sp, len);
971 /****************************************************************************
974 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
975 * sockets. However, in order to control kernel tunnel features, we allow
976 * userspace to create a special "tunnel" PPPoX socket which is used for
977 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
978 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
980 ****************************************************************************/
982 static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest,
983 struct l2tp_stats *stats)
985 dest->tx_packets = atomic_long_read(&stats->tx_packets);
986 dest->tx_bytes = atomic_long_read(&stats->tx_bytes);
987 dest->tx_errors = atomic_long_read(&stats->tx_errors);
988 dest->rx_packets = atomic_long_read(&stats->rx_packets);
989 dest->rx_bytes = atomic_long_read(&stats->rx_bytes);
990 dest->rx_seq_discards = atomic_long_read(&stats->rx_seq_discards);
991 dest->rx_oos_packets = atomic_long_read(&stats->rx_oos_packets);
992 dest->rx_errors = atomic_long_read(&stats->rx_errors);
995 /* Session ioctl helper.
997 static int pppol2tp_session_ioctl(struct l2tp_session *session,
998 unsigned int cmd, unsigned long arg)
1003 int val = (int) arg;
1004 struct pppol2tp_session *ps = l2tp_session_priv(session);
1005 struct l2tp_tunnel *tunnel = session->tunnel;
1006 struct pppol2tp_ioc_stats stats;
1008 l2tp_dbg(session, L2TP_MSG_CONTROL,
1009 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
1010 session->name, cmd, arg);
1012 sk = pppol2tp_session_get_sock(session);
1019 if (!(sk->sk_state & PPPOX_CONNECTED))
1023 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1025 ifr.ifr_mtu = session->mtu;
1026 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
1029 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mtu=%d\n",
1030 session->name, session->mtu);
1036 if (!(sk->sk_state & PPPOX_CONNECTED))
1040 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1043 session->mtu = ifr.ifr_mtu;
1045 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mtu=%d\n",
1046 session->name, session->mtu);
1052 if (!(sk->sk_state & PPPOX_CONNECTED))
1056 if (put_user(session->mru, (int __user *) arg))
1059 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mru=%d\n",
1060 session->name, session->mru);
1066 if (!(sk->sk_state & PPPOX_CONNECTED))
1070 if (get_user(val, (int __user *) arg))
1074 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mru=%d\n",
1075 session->name, session->mru);
1081 if (put_user(ps->flags, (int __user *) arg))
1084 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get flags=%d\n",
1085 session->name, ps->flags);
1091 if (get_user(val, (int __user *) arg))
1094 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set flags=%d\n",
1095 session->name, ps->flags);
1099 case PPPIOCGL2TPSTATS:
1101 if (!(sk->sk_state & PPPOX_CONNECTED))
1104 memset(&stats, 0, sizeof(stats));
1105 stats.tunnel_id = tunnel->tunnel_id;
1106 stats.session_id = session->session_id;
1107 pppol2tp_copy_stats(&stats, &session->stats);
1108 if (copy_to_user((void __user *) arg, &stats,
1111 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1126 /* Tunnel ioctl helper.
1128 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1129 * specifies a session_id, the session ioctl handler is called. This allows an
1130 * application to retrieve session stats via a tunnel socket.
1132 static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
1133 unsigned int cmd, unsigned long arg)
1137 struct pppol2tp_ioc_stats stats;
1139 l2tp_dbg(tunnel, L2TP_MSG_CONTROL,
1140 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1141 tunnel->name, cmd, arg);
1147 case PPPIOCGL2TPSTATS:
1149 if (!(sk->sk_state & PPPOX_CONNECTED))
1152 if (copy_from_user(&stats, (void __user *) arg,
1157 if (stats.session_id != 0) {
1158 /* resend to session ioctl handler */
1159 struct l2tp_session *session =
1160 l2tp_session_get(sock_net(sk), tunnel,
1164 err = pppol2tp_session_ioctl(session, cmd,
1166 l2tp_session_dec_refcount(session);
1173 stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
1175 pppol2tp_copy_stats(&stats, &tunnel->stats);
1176 if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) {
1180 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1195 /* Main ioctl() handler.
1196 * Dispatch to tunnel or session helpers depending on the socket.
1198 static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
1201 struct sock *sk = sock->sk;
1202 struct l2tp_session *session;
1203 struct l2tp_tunnel *tunnel;
1210 if (sock_flag(sk, SOCK_DEAD) != 0)
1214 if ((sk->sk_user_data == NULL) ||
1215 (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
1218 /* Get session context from the socket */
1220 session = pppol2tp_sock_to_session(sk);
1221 if (session == NULL)
1224 /* Special case: if session's session_id is zero, treat ioctl as a
1227 if ((session->session_id == 0) &&
1228 (session->peer_session_id == 0)) {
1229 tunnel = session->tunnel;
1230 err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
1234 err = pppol2tp_session_ioctl(session, cmd, arg);
1242 /*****************************************************************************
1243 * setsockopt() / getsockopt() support.
1245 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1246 * sockets. In order to control kernel tunnel features, we allow userspace to
1247 * create a special "tunnel" PPPoX socket which is used for control only.
1248 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1249 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1250 *****************************************************************************/
1252 /* Tunnel setsockopt() helper.
1254 static int pppol2tp_tunnel_setsockopt(struct sock *sk,
1255 struct l2tp_tunnel *tunnel,
1256 int optname, int val)
1261 case PPPOL2TP_SO_DEBUG:
1262 tunnel->debug = val;
1263 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: set debug=%x\n",
1264 tunnel->name, tunnel->debug);
1275 /* Session setsockopt helper.
1277 static int pppol2tp_session_setsockopt(struct sock *sk,
1278 struct l2tp_session *session,
1279 int optname, int val)
1284 case PPPOL2TP_SO_RECVSEQ:
1285 if ((val != 0) && (val != 1)) {
1289 session->recv_seq = !!val;
1290 l2tp_info(session, L2TP_MSG_CONTROL,
1291 "%s: set recv_seq=%d\n",
1292 session->name, session->recv_seq);
1295 case PPPOL2TP_SO_SENDSEQ:
1296 if ((val != 0) && (val != 1)) {
1300 session->send_seq = !!val;
1302 struct pppox_sock *po = pppox_sk(sk);
1304 po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
1305 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1307 l2tp_session_set_header_len(session, session->tunnel->version);
1308 l2tp_info(session, L2TP_MSG_CONTROL,
1309 "%s: set send_seq=%d\n",
1310 session->name, session->send_seq);
1313 case PPPOL2TP_SO_LNSMODE:
1314 if ((val != 0) && (val != 1)) {
1318 session->lns_mode = !!val;
1319 l2tp_info(session, L2TP_MSG_CONTROL,
1320 "%s: set lns_mode=%d\n",
1321 session->name, session->lns_mode);
1324 case PPPOL2TP_SO_DEBUG:
1325 session->debug = val;
1326 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set debug=%x\n",
1327 session->name, session->debug);
1330 case PPPOL2TP_SO_REORDERTO:
1331 session->reorder_timeout = msecs_to_jiffies(val);
1332 l2tp_info(session, L2TP_MSG_CONTROL,
1333 "%s: set reorder_timeout=%d\n",
1334 session->name, session->reorder_timeout);
1345 /* Main setsockopt() entry point.
1346 * Does API checks, then calls either the tunnel or session setsockopt
1347 * handler, according to whether the PPPoL2TP socket is a for a regular
1348 * session or the special tunnel type.
1350 static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
1351 char __user *optval, unsigned int optlen)
1353 struct sock *sk = sock->sk;
1354 struct l2tp_session *session;
1355 struct l2tp_tunnel *tunnel;
1359 if (level != SOL_PPPOL2TP)
1362 if (optlen < sizeof(int))
1365 if (get_user(val, (int __user *)optval))
1369 if (sk->sk_user_data == NULL)
1372 /* Get session context from the socket */
1374 session = pppol2tp_sock_to_session(sk);
1375 if (session == NULL)
1378 /* Special case: if session_id == 0x0000, treat as operation on tunnel
1380 if ((session->session_id == 0) &&
1381 (session->peer_session_id == 0)) {
1382 tunnel = session->tunnel;
1383 err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
1385 err = pppol2tp_session_setsockopt(sk, session, optname, val);
1393 /* Tunnel getsockopt helper. Called with sock locked.
1395 static int pppol2tp_tunnel_getsockopt(struct sock *sk,
1396 struct l2tp_tunnel *tunnel,
1397 int optname, int *val)
1402 case PPPOL2TP_SO_DEBUG:
1403 *val = tunnel->debug;
1404 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get debug=%x\n",
1405 tunnel->name, tunnel->debug);
1416 /* Session getsockopt helper. Called with sock locked.
1418 static int pppol2tp_session_getsockopt(struct sock *sk,
1419 struct l2tp_session *session,
1420 int optname, int *val)
1425 case PPPOL2TP_SO_RECVSEQ:
1426 *val = session->recv_seq;
1427 l2tp_info(session, L2TP_MSG_CONTROL,
1428 "%s: get recv_seq=%d\n", session->name, *val);
1431 case PPPOL2TP_SO_SENDSEQ:
1432 *val = session->send_seq;
1433 l2tp_info(session, L2TP_MSG_CONTROL,
1434 "%s: get send_seq=%d\n", session->name, *val);
1437 case PPPOL2TP_SO_LNSMODE:
1438 *val = session->lns_mode;
1439 l2tp_info(session, L2TP_MSG_CONTROL,
1440 "%s: get lns_mode=%d\n", session->name, *val);
1443 case PPPOL2TP_SO_DEBUG:
1444 *val = session->debug;
1445 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get debug=%d\n",
1446 session->name, *val);
1449 case PPPOL2TP_SO_REORDERTO:
1450 *val = (int) jiffies_to_msecs(session->reorder_timeout);
1451 l2tp_info(session, L2TP_MSG_CONTROL,
1452 "%s: get reorder_timeout=%d\n", session->name, *val);
1462 /* Main getsockopt() entry point.
1463 * Does API checks, then calls either the tunnel or session getsockopt
1464 * handler, according to whether the PPPoX socket is a for a regular session
1465 * or the special tunnel type.
1467 static int pppol2tp_getsockopt(struct socket *sock, int level, int optname,
1468 char __user *optval, int __user *optlen)
1470 struct sock *sk = sock->sk;
1471 struct l2tp_session *session;
1472 struct l2tp_tunnel *tunnel;
1476 if (level != SOL_PPPOL2TP)
1479 if (get_user(len, optlen))
1482 len = min_t(unsigned int, len, sizeof(int));
1488 if (sk->sk_user_data == NULL)
1491 /* Get the session context */
1493 session = pppol2tp_sock_to_session(sk);
1494 if (session == NULL)
1497 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1498 if ((session->session_id == 0) &&
1499 (session->peer_session_id == 0)) {
1500 tunnel = session->tunnel;
1501 err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
1505 err = pppol2tp_session_getsockopt(sk, session, optname, &val);
1511 if (put_user(len, optlen))
1514 if (copy_to_user((void __user *) optval, &val, len))
1525 /*****************************************************************************
1526 * /proc filesystem for debug
1527 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1528 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1529 *****************************************************************************/
1531 static unsigned int pppol2tp_net_id;
1533 #ifdef CONFIG_PROC_FS
1535 struct pppol2tp_seq_data {
1536 struct seq_net_private p;
1537 int tunnel_idx; /* current tunnel */
1538 int session_idx; /* index of session within current tunnel */
1539 struct l2tp_tunnel *tunnel;
1540 struct l2tp_session *session; /* NULL means get next tunnel */
1543 static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
1546 pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx);
1549 if (pd->tunnel == NULL)
1552 /* Ignore L2TPv3 tunnels */
1553 if (pd->tunnel->version < 3)
1558 static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
1560 pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx);
1563 if (pd->session == NULL) {
1564 pd->session_idx = 0;
1565 pppol2tp_next_tunnel(net, pd);
1569 static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
1571 struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
1578 BUG_ON(m->private == NULL);
1580 net = seq_file_net(m);
1582 if (pd->tunnel == NULL)
1583 pppol2tp_next_tunnel(net, pd);
1585 pppol2tp_next_session(net, pd);
1587 /* NULL tunnel and session indicates end of list */
1588 if ((pd->tunnel == NULL) && (pd->session == NULL))
1595 static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
1601 static void pppol2tp_seq_stop(struct seq_file *p, void *v)
1606 static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
1608 struct l2tp_tunnel *tunnel = v;
1610 seq_printf(m, "\nTUNNEL '%s', %c %d\n",
1612 (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
1613 refcount_read(&tunnel->ref_count) - 1);
1614 seq_printf(m, " %08x %ld/%ld/%ld %ld/%ld/%ld\n",
1616 atomic_long_read(&tunnel->stats.tx_packets),
1617 atomic_long_read(&tunnel->stats.tx_bytes),
1618 atomic_long_read(&tunnel->stats.tx_errors),
1619 atomic_long_read(&tunnel->stats.rx_packets),
1620 atomic_long_read(&tunnel->stats.rx_bytes),
1621 atomic_long_read(&tunnel->stats.rx_errors));
1624 static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
1626 struct l2tp_session *session = v;
1627 struct l2tp_tunnel *tunnel = session->tunnel;
1628 unsigned char state;
1635 struct inet_sock *inet = inet_sk(tunnel->sock);
1636 ip = ntohl(inet->inet_saddr);
1637 port = ntohs(inet->inet_sport);
1640 sk = pppol2tp_session_get_sock(session);
1642 state = sk->sk_state;
1643 user_data_ok = (session == sk->sk_user_data) ? 'Y' : 'N';
1649 seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
1650 "%04X/%04X %d %c\n",
1651 session->name, ip, port,
1653 session->session_id,
1654 tunnel->peer_tunnel_id,
1655 session->peer_session_id,
1656 state, user_data_ok);
1657 seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n",
1658 session->mtu, session->mru,
1659 session->recv_seq ? 'R' : '-',
1660 session->send_seq ? 'S' : '-',
1661 session->lns_mode ? "LNS" : "LAC",
1663 jiffies_to_msecs(session->reorder_timeout));
1664 seq_printf(m, " %hu/%hu %ld/%ld/%ld %ld/%ld/%ld\n",
1665 session->nr, session->ns,
1666 atomic_long_read(&session->stats.tx_packets),
1667 atomic_long_read(&session->stats.tx_bytes),
1668 atomic_long_read(&session->stats.tx_errors),
1669 atomic_long_read(&session->stats.rx_packets),
1670 atomic_long_read(&session->stats.rx_bytes),
1671 atomic_long_read(&session->stats.rx_errors));
1674 struct pppox_sock *po = pppox_sk(sk);
1676 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
1681 static int pppol2tp_seq_show(struct seq_file *m, void *v)
1683 struct pppol2tp_seq_data *pd = v;
1685 /* display header on line 1 */
1686 if (v == SEQ_START_TOKEN) {
1687 seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
1688 seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
1689 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1690 seq_puts(m, " SESSION name, addr/port src-tid/sid "
1691 "dest-tid/sid state user-data-ok\n");
1692 seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1693 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1697 /* Show the tunnel or session context.
1700 pppol2tp_seq_tunnel_show(m, pd->tunnel);
1702 pppol2tp_seq_session_show(m, pd->session);
1703 l2tp_session_dec_refcount(pd->session);
1710 static const struct seq_operations pppol2tp_seq_ops = {
1711 .start = pppol2tp_seq_start,
1712 .next = pppol2tp_seq_next,
1713 .stop = pppol2tp_seq_stop,
1714 .show = pppol2tp_seq_show,
1717 /* Called when our /proc file is opened. We allocate data for use when
1718 * iterating our tunnel / session contexts and store it in the private
1719 * data of the seq_file.
1721 static int pppol2tp_proc_open(struct inode *inode, struct file *file)
1723 return seq_open_net(inode, file, &pppol2tp_seq_ops,
1724 sizeof(struct pppol2tp_seq_data));
1727 static const struct file_operations pppol2tp_proc_fops = {
1728 .open = pppol2tp_proc_open,
1730 .llseek = seq_lseek,
1731 .release = seq_release_net,
1734 #endif /* CONFIG_PROC_FS */
1736 /*****************************************************************************
1738 *****************************************************************************/
1740 static __net_init int pppol2tp_init_net(struct net *net)
1742 struct proc_dir_entry *pde;
1745 pde = proc_create("pppol2tp", S_IRUGO, net->proc_net,
1746 &pppol2tp_proc_fops);
1756 static __net_exit void pppol2tp_exit_net(struct net *net)
1758 remove_proc_entry("pppol2tp", net->proc_net);
1761 static struct pernet_operations pppol2tp_net_ops = {
1762 .init = pppol2tp_init_net,
1763 .exit = pppol2tp_exit_net,
1764 .id = &pppol2tp_net_id,
1768 /*****************************************************************************
1770 *****************************************************************************/
1772 static const struct proto_ops pppol2tp_ops = {
1774 .owner = THIS_MODULE,
1775 .release = pppol2tp_release,
1776 .bind = sock_no_bind,
1777 .connect = pppol2tp_connect,
1778 .socketpair = sock_no_socketpair,
1779 .accept = sock_no_accept,
1780 .getname = pppol2tp_getname,
1781 .poll = datagram_poll,
1782 .listen = sock_no_listen,
1783 .shutdown = sock_no_shutdown,
1784 .setsockopt = pppol2tp_setsockopt,
1785 .getsockopt = pppol2tp_getsockopt,
1786 .sendmsg = pppol2tp_sendmsg,
1787 .recvmsg = pppol2tp_recvmsg,
1788 .mmap = sock_no_mmap,
1789 .ioctl = pppox_ioctl,
1792 static const struct pppox_proto pppol2tp_proto = {
1793 .create = pppol2tp_create,
1794 .ioctl = pppol2tp_ioctl,
1795 .owner = THIS_MODULE,
1798 #ifdef CONFIG_L2TP_V3
1800 static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = {
1801 .session_create = pppol2tp_session_create,
1802 .session_delete = l2tp_session_delete,
1805 #endif /* CONFIG_L2TP_V3 */
1807 static int __init pppol2tp_init(void)
1811 err = register_pernet_device(&pppol2tp_net_ops);
1815 err = proto_register(&pppol2tp_sk_proto, 0);
1817 goto out_unregister_pppol2tp_pernet;
1819 err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
1821 goto out_unregister_pppol2tp_proto;
1823 #ifdef CONFIG_L2TP_V3
1824 err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops);
1826 goto out_unregister_pppox;
1829 pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION);
1834 #ifdef CONFIG_L2TP_V3
1835 out_unregister_pppox:
1836 unregister_pppox_proto(PX_PROTO_OL2TP);
1838 out_unregister_pppol2tp_proto:
1839 proto_unregister(&pppol2tp_sk_proto);
1840 out_unregister_pppol2tp_pernet:
1841 unregister_pernet_device(&pppol2tp_net_ops);
1845 static void __exit pppol2tp_exit(void)
1847 #ifdef CONFIG_L2TP_V3
1848 l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP);
1850 unregister_pppox_proto(PX_PROTO_OL2TP);
1851 proto_unregister(&pppol2tp_sk_proto);
1852 unregister_pernet_device(&pppol2tp_net_ops);
1855 module_init(pppol2tp_init);
1856 module_exit(pppol2tp_exit);
1858 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1859 MODULE_DESCRIPTION("PPP over L2TP over UDP");
1860 MODULE_LICENSE("GPL");
1861 MODULE_VERSION(PPPOL2TP_DRV_VERSION);
1862 MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_OL2TP);
1863 MODULE_ALIAS_L2TP_PWTYPE(7);