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 /* Really kill the session socket. (Called from sock_put() if
430 static void pppol2tp_session_destruct(struct sock *sk)
432 struct l2tp_session *session = sk->sk_user_data;
434 skb_queue_purge(&sk->sk_receive_queue);
435 skb_queue_purge(&sk->sk_write_queue);
438 sk->sk_user_data = NULL;
439 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
440 l2tp_session_dec_refcount(session);
444 /* Called when the PPPoX socket (session) is closed.
446 static int pppol2tp_release(struct socket *sock)
448 struct sock *sk = sock->sk;
449 struct l2tp_session *session;
457 if (sock_flag(sk, SOCK_DEAD) != 0)
460 pppox_unbind_sock(sk);
462 /* Signal the death of the socket. */
463 sk->sk_state = PPPOX_DEAD;
467 session = pppol2tp_sock_to_session(sk);
469 struct pppol2tp_session *ps;
471 l2tp_session_delete(session);
473 ps = l2tp_session_priv(session);
474 mutex_lock(&ps->sk_lock);
475 ps->__sk = rcu_dereference_protected(ps->sk,
476 lockdep_is_held(&ps->sk_lock));
477 RCU_INIT_POINTER(ps->sk, NULL);
478 mutex_unlock(&ps->sk_lock);
479 call_rcu(&ps->rcu, pppol2tp_put_sk);
481 /* Rely on the sock_put() call at the end of the function for
482 * dropping the reference held by pppol2tp_sock_to_session().
483 * The last reference will be dropped by pppol2tp_put_sk().
489 /* This will delete the session context via
490 * pppol2tp_session_destruct() if the socket's refcnt drops to
502 static struct proto pppol2tp_sk_proto = {
504 .owner = THIS_MODULE,
505 .obj_size = sizeof(struct pppox_sock),
508 static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb)
512 rc = l2tp_udp_encap_recv(sk, skb);
516 return NET_RX_SUCCESS;
519 /* socket() handler. Initialize a new struct sock.
521 static int pppol2tp_create(struct net *net, struct socket *sock, int kern)
526 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto, kern);
530 sock_init_data(sock, sk);
532 sock->state = SS_UNCONNECTED;
533 sock->ops = &pppol2tp_ops;
535 sk->sk_backlog_rcv = pppol2tp_backlog_recv;
536 sk->sk_protocol = PX_PROTO_OL2TP;
537 sk->sk_family = PF_PPPOX;
538 sk->sk_state = PPPOX_NONE;
539 sk->sk_type = SOCK_STREAM;
540 sk->sk_destruct = pppol2tp_session_destruct;
548 #if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
549 static void pppol2tp_show(struct seq_file *m, void *arg)
551 struct l2tp_session *session = arg;
554 sk = pppol2tp_session_get_sock(session);
556 struct pppox_sock *po = pppox_sk(sk);
558 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
564 static void pppol2tp_session_init(struct l2tp_session *session)
566 struct pppol2tp_session *ps;
567 struct dst_entry *dst;
569 session->recv_skb = pppol2tp_recv;
570 #if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
571 session->show = pppol2tp_show;
574 ps = l2tp_session_priv(session);
575 mutex_init(&ps->sk_lock);
576 ps->owner = current->pid;
578 /* If PMTU discovery was enabled, use the MTU that was discovered */
579 dst = sk_dst_get(session->tunnel->sock);
581 u32 pmtu = dst_mtu(dst);
584 session->mtu = pmtu - PPPOL2TP_HEADER_OVERHEAD;
585 session->mru = pmtu - PPPOL2TP_HEADER_OVERHEAD;
591 struct l2tp_connect_info {
600 static int pppol2tp_sockaddr_get_info(const void *sa, int sa_len,
601 struct l2tp_connect_info *info)
604 case sizeof(struct sockaddr_pppol2tp):
606 const struct sockaddr_pppol2tp *sa_v2in4 = sa;
608 if (sa_v2in4->sa_protocol != PX_PROTO_OL2TP)
612 info->fd = sa_v2in4->pppol2tp.fd;
613 info->tunnel_id = sa_v2in4->pppol2tp.s_tunnel;
614 info->peer_tunnel_id = sa_v2in4->pppol2tp.d_tunnel;
615 info->session_id = sa_v2in4->pppol2tp.s_session;
616 info->peer_session_id = sa_v2in4->pppol2tp.d_session;
620 case sizeof(struct sockaddr_pppol2tpv3):
622 const struct sockaddr_pppol2tpv3 *sa_v3in4 = sa;
624 if (sa_v3in4->sa_protocol != PX_PROTO_OL2TP)
628 info->fd = sa_v3in4->pppol2tp.fd;
629 info->tunnel_id = sa_v3in4->pppol2tp.s_tunnel;
630 info->peer_tunnel_id = sa_v3in4->pppol2tp.d_tunnel;
631 info->session_id = sa_v3in4->pppol2tp.s_session;
632 info->peer_session_id = sa_v3in4->pppol2tp.d_session;
636 case sizeof(struct sockaddr_pppol2tpin6):
638 const struct sockaddr_pppol2tpin6 *sa_v2in6 = sa;
640 if (sa_v2in6->sa_protocol != PX_PROTO_OL2TP)
644 info->fd = sa_v2in6->pppol2tp.fd;
645 info->tunnel_id = sa_v2in6->pppol2tp.s_tunnel;
646 info->peer_tunnel_id = sa_v2in6->pppol2tp.d_tunnel;
647 info->session_id = sa_v2in6->pppol2tp.s_session;
648 info->peer_session_id = sa_v2in6->pppol2tp.d_session;
652 case sizeof(struct sockaddr_pppol2tpv3in6):
654 const struct sockaddr_pppol2tpv3in6 *sa_v3in6 = sa;
656 if (sa_v3in6->sa_protocol != PX_PROTO_OL2TP)
660 info->fd = sa_v3in6->pppol2tp.fd;
661 info->tunnel_id = sa_v3in6->pppol2tp.s_tunnel;
662 info->peer_tunnel_id = sa_v3in6->pppol2tp.d_tunnel;
663 info->session_id = sa_v3in6->pppol2tp.s_session;
664 info->peer_session_id = sa_v3in6->pppol2tp.d_session;
675 /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
677 static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
678 int sockaddr_len, int flags)
680 struct sock *sk = sock->sk;
681 struct pppox_sock *po = pppox_sk(sk);
682 struct l2tp_session *session = NULL;
683 struct l2tp_connect_info info;
684 struct l2tp_tunnel *tunnel;
685 struct pppol2tp_session *ps;
686 struct l2tp_session_cfg cfg = { 0, };
687 bool drop_refcnt = false;
688 bool drop_tunnel = false;
689 bool new_session = false;
690 bool new_tunnel = false;
693 error = pppol2tp_sockaddr_get_info(uservaddr, sockaddr_len, &info);
699 /* Check for already bound sockets */
701 if (sk->sk_state & PPPOX_CONNECTED)
704 /* We don't supporting rebinding anyway */
706 if (sk->sk_user_data)
707 goto end; /* socket is already attached */
709 /* Don't bind if tunnel_id is 0 */
714 tunnel = l2tp_tunnel_get(sock_net(sk), info.tunnel_id);
718 /* Special case: create tunnel context if session_id and
719 * peer_session_id is 0. Otherwise look up tunnel using supplied
722 if (!info.session_id && !info.peer_session_id) {
723 if (tunnel == NULL) {
724 struct l2tp_tunnel_cfg tcfg = {
725 .encap = L2TP_ENCAPTYPE_UDP,
729 /* Prevent l2tp_tunnel_register() from trying to set up
737 error = l2tp_tunnel_create(sock_net(sk), info.fd,
740 info.peer_tunnel_id, &tcfg,
745 l2tp_tunnel_inc_refcount(tunnel);
746 error = l2tp_tunnel_register(tunnel, sock_net(sk),
756 /* Error if we can't find the tunnel */
761 /* Error if socket is not prepped */
762 if (tunnel->sock == NULL)
766 if (tunnel->recv_payload_hook == NULL)
767 tunnel->recv_payload_hook = pppol2tp_recv_payload_hook;
769 if (tunnel->peer_tunnel_id == 0)
770 tunnel->peer_tunnel_id = info.peer_tunnel_id;
772 session = l2tp_session_get(sock_net(sk), tunnel, info.session_id);
776 if (session->pwtype != L2TP_PWTYPE_PPP) {
781 ps = l2tp_session_priv(session);
783 /* Using a pre-existing session is fine as long as it hasn't
784 * been connected yet.
786 mutex_lock(&ps->sk_lock);
787 if (rcu_dereference_protected(ps->sk,
788 lockdep_is_held(&ps->sk_lock)) ||
790 mutex_unlock(&ps->sk_lock);
795 /* Default MTU must allow space for UDP/L2TP/PPP headers */
796 cfg.mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
798 cfg.pw_type = L2TP_PWTYPE_PPP;
800 session = l2tp_session_create(sizeof(struct pppol2tp_session),
801 tunnel, info.session_id,
802 info.peer_session_id, &cfg);
803 if (IS_ERR(session)) {
804 error = PTR_ERR(session);
808 pppol2tp_session_init(session);
809 ps = l2tp_session_priv(session);
810 l2tp_session_inc_refcount(session);
812 mutex_lock(&ps->sk_lock);
813 error = l2tp_session_register(session, tunnel);
815 mutex_unlock(&ps->sk_lock);
823 /* Special case: if source & dest session_id == 0x0000, this
824 * socket is being created to manage the tunnel. Just set up
825 * the internal context for use by ioctl() and sockopt()
828 if ((session->session_id == 0) &&
829 (session->peer_session_id == 0)) {
834 /* The only header we need to worry about is the L2TP
835 * header. This size is different depending on whether
836 * sequence numbers are enabled for the data channel.
838 po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
840 po->chan.private = sk;
841 po->chan.ops = &pppol2tp_chan_ops;
842 po->chan.mtu = session->mtu;
844 error = ppp_register_net_channel(sock_net(sk), &po->chan);
846 mutex_unlock(&ps->sk_lock);
851 /* This is how we get the session context from the socket. */
852 sk->sk_user_data = session;
853 rcu_assign_pointer(ps->sk, sk);
854 mutex_unlock(&ps->sk_lock);
856 /* Keep the reference we've grabbed on the session: sk doesn't expect
857 * the session to disappear. pppol2tp_session_destruct() is responsible
862 sk->sk_state = PPPOX_CONNECTED;
863 l2tp_info(session, L2TP_MSG_CONTROL, "%s: created\n",
869 l2tp_session_delete(session);
871 l2tp_tunnel_delete(tunnel);
874 l2tp_session_dec_refcount(session);
876 l2tp_tunnel_dec_refcount(tunnel);
882 #ifdef CONFIG_L2TP_V3
884 /* Called when creating sessions via the netlink interface. */
885 static int pppol2tp_session_create(struct net *net, struct l2tp_tunnel *tunnel,
886 u32 session_id, u32 peer_session_id,
887 struct l2tp_session_cfg *cfg)
890 struct l2tp_session *session;
892 /* Error if tunnel socket is not prepped */
898 /* Default MTU values. */
900 cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
904 /* Allocate and initialize a new session context. */
905 session = l2tp_session_create(sizeof(struct pppol2tp_session),
907 peer_session_id, cfg);
908 if (IS_ERR(session)) {
909 error = PTR_ERR(session);
913 pppol2tp_session_init(session);
915 error = l2tp_session_register(session, tunnel);
927 #endif /* CONFIG_L2TP_V3 */
929 /* getname() support.
931 static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
936 struct l2tp_session *session;
937 struct l2tp_tunnel *tunnel;
938 struct sock *sk = sock->sk;
939 struct inet_sock *inet;
940 struct pppol2tp_session *pls;
945 if (!(sk->sk_state & PPPOX_CONNECTED))
949 session = pppol2tp_sock_to_session(sk);
953 pls = l2tp_session_priv(session);
954 tunnel = session->tunnel;
956 inet = inet_sk(tunnel->sock);
957 if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) {
958 struct sockaddr_pppol2tp sp;
961 sp.sa_family = AF_PPPOX;
962 sp.sa_protocol = PX_PROTO_OL2TP;
963 sp.pppol2tp.fd = tunnel->fd;
964 sp.pppol2tp.pid = pls->owner;
965 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
966 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
967 sp.pppol2tp.s_session = session->session_id;
968 sp.pppol2tp.d_session = session->peer_session_id;
969 sp.pppol2tp.addr.sin_family = AF_INET;
970 sp.pppol2tp.addr.sin_port = inet->inet_dport;
971 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
972 memcpy(uaddr, &sp, len);
973 #if IS_ENABLED(CONFIG_IPV6)
974 } else if ((tunnel->version == 2) &&
975 (tunnel->sock->sk_family == AF_INET6)) {
976 struct sockaddr_pppol2tpin6 sp;
980 sp.sa_family = AF_PPPOX;
981 sp.sa_protocol = PX_PROTO_OL2TP;
982 sp.pppol2tp.fd = tunnel->fd;
983 sp.pppol2tp.pid = pls->owner;
984 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
985 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
986 sp.pppol2tp.s_session = session->session_id;
987 sp.pppol2tp.d_session = session->peer_session_id;
988 sp.pppol2tp.addr.sin6_family = AF_INET6;
989 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
990 memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
991 sizeof(tunnel->sock->sk_v6_daddr));
992 memcpy(uaddr, &sp, len);
993 } else if ((tunnel->version == 3) &&
994 (tunnel->sock->sk_family == AF_INET6)) {
995 struct sockaddr_pppol2tpv3in6 sp;
999 sp.sa_family = AF_PPPOX;
1000 sp.sa_protocol = PX_PROTO_OL2TP;
1001 sp.pppol2tp.fd = tunnel->fd;
1002 sp.pppol2tp.pid = pls->owner;
1003 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
1004 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
1005 sp.pppol2tp.s_session = session->session_id;
1006 sp.pppol2tp.d_session = session->peer_session_id;
1007 sp.pppol2tp.addr.sin6_family = AF_INET6;
1008 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
1009 memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
1010 sizeof(tunnel->sock->sk_v6_daddr));
1011 memcpy(uaddr, &sp, len);
1013 } else if (tunnel->version == 3) {
1014 struct sockaddr_pppol2tpv3 sp;
1016 memset(&sp, 0, len);
1017 sp.sa_family = AF_PPPOX;
1018 sp.sa_protocol = PX_PROTO_OL2TP;
1019 sp.pppol2tp.fd = tunnel->fd;
1020 sp.pppol2tp.pid = pls->owner;
1021 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
1022 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
1023 sp.pppol2tp.s_session = session->session_id;
1024 sp.pppol2tp.d_session = session->peer_session_id;
1025 sp.pppol2tp.addr.sin_family = AF_INET;
1026 sp.pppol2tp.addr.sin_port = inet->inet_dport;
1027 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
1028 memcpy(uaddr, &sp, len);
1038 /****************************************************************************
1041 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1042 * sockets. However, in order to control kernel tunnel features, we allow
1043 * userspace to create a special "tunnel" PPPoX socket which is used for
1044 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
1045 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
1047 ****************************************************************************/
1049 static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest,
1050 struct l2tp_stats *stats)
1052 dest->tx_packets = atomic_long_read(&stats->tx_packets);
1053 dest->tx_bytes = atomic_long_read(&stats->tx_bytes);
1054 dest->tx_errors = atomic_long_read(&stats->tx_errors);
1055 dest->rx_packets = atomic_long_read(&stats->rx_packets);
1056 dest->rx_bytes = atomic_long_read(&stats->rx_bytes);
1057 dest->rx_seq_discards = atomic_long_read(&stats->rx_seq_discards);
1058 dest->rx_oos_packets = atomic_long_read(&stats->rx_oos_packets);
1059 dest->rx_errors = atomic_long_read(&stats->rx_errors);
1062 /* Session ioctl helper.
1064 static int pppol2tp_session_ioctl(struct l2tp_session *session,
1065 unsigned int cmd, unsigned long arg)
1070 int val = (int) arg;
1071 struct pppol2tp_session *ps = l2tp_session_priv(session);
1072 struct l2tp_tunnel *tunnel = session->tunnel;
1073 struct pppol2tp_ioc_stats stats;
1075 l2tp_dbg(session, L2TP_MSG_CONTROL,
1076 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
1077 session->name, cmd, arg);
1079 sk = pppol2tp_session_get_sock(session);
1086 if (!(sk->sk_state & PPPOX_CONNECTED))
1090 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1092 ifr.ifr_mtu = session->mtu;
1093 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
1096 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mtu=%d\n",
1097 session->name, session->mtu);
1103 if (!(sk->sk_state & PPPOX_CONNECTED))
1107 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1110 session->mtu = ifr.ifr_mtu;
1112 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mtu=%d\n",
1113 session->name, session->mtu);
1119 if (!(sk->sk_state & PPPOX_CONNECTED))
1123 if (put_user(session->mru, (int __user *) arg))
1126 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mru=%d\n",
1127 session->name, session->mru);
1133 if (!(sk->sk_state & PPPOX_CONNECTED))
1137 if (get_user(val, (int __user *) arg))
1141 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mru=%d\n",
1142 session->name, session->mru);
1148 if (put_user(ps->flags, (int __user *) arg))
1151 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get flags=%d\n",
1152 session->name, ps->flags);
1158 if (get_user(val, (int __user *) arg))
1161 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set flags=%d\n",
1162 session->name, ps->flags);
1166 case PPPIOCGL2TPSTATS:
1168 if (!(sk->sk_state & PPPOX_CONNECTED))
1171 memset(&stats, 0, sizeof(stats));
1172 stats.tunnel_id = tunnel->tunnel_id;
1173 stats.session_id = session->session_id;
1174 pppol2tp_copy_stats(&stats, &session->stats);
1175 if (copy_to_user((void __user *) arg, &stats,
1178 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1193 /* Tunnel ioctl helper.
1195 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1196 * specifies a session_id, the session ioctl handler is called. This allows an
1197 * application to retrieve session stats via a tunnel socket.
1199 static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
1200 unsigned int cmd, unsigned long arg)
1204 struct pppol2tp_ioc_stats stats;
1206 l2tp_dbg(tunnel, L2TP_MSG_CONTROL,
1207 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1208 tunnel->name, cmd, arg);
1214 case PPPIOCGL2TPSTATS:
1216 if (!(sk->sk_state & PPPOX_CONNECTED))
1219 if (copy_from_user(&stats, (void __user *) arg,
1224 if (stats.session_id != 0) {
1225 /* resend to session ioctl handler */
1226 struct l2tp_session *session =
1227 l2tp_session_get(sock_net(sk), tunnel,
1230 if (session && session->pwtype == L2TP_PWTYPE_PPP) {
1231 err = pppol2tp_session_ioctl(session, cmd,
1233 l2tp_session_dec_refcount(session);
1240 stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
1242 pppol2tp_copy_stats(&stats, &tunnel->stats);
1243 if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) {
1247 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1262 /* Main ioctl() handler.
1263 * Dispatch to tunnel or session helpers depending on the socket.
1265 static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
1268 struct sock *sk = sock->sk;
1269 struct l2tp_session *session;
1270 struct l2tp_tunnel *tunnel;
1277 if (sock_flag(sk, SOCK_DEAD) != 0)
1281 if ((sk->sk_user_data == NULL) ||
1282 (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
1285 /* Get session context from the socket */
1287 session = pppol2tp_sock_to_session(sk);
1288 if (session == NULL)
1291 /* Special case: if session's session_id is zero, treat ioctl as a
1294 if ((session->session_id == 0) &&
1295 (session->peer_session_id == 0)) {
1296 tunnel = session->tunnel;
1297 err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
1301 err = pppol2tp_session_ioctl(session, cmd, arg);
1309 /*****************************************************************************
1310 * setsockopt() / getsockopt() support.
1312 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1313 * sockets. In order to control kernel tunnel features, we allow userspace to
1314 * create a special "tunnel" PPPoX socket which is used for control only.
1315 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1316 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1317 *****************************************************************************/
1319 /* Tunnel setsockopt() helper.
1321 static int pppol2tp_tunnel_setsockopt(struct sock *sk,
1322 struct l2tp_tunnel *tunnel,
1323 int optname, int val)
1328 case PPPOL2TP_SO_DEBUG:
1329 tunnel->debug = val;
1330 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: set debug=%x\n",
1331 tunnel->name, tunnel->debug);
1342 /* Session setsockopt helper.
1344 static int pppol2tp_session_setsockopt(struct sock *sk,
1345 struct l2tp_session *session,
1346 int optname, int val)
1351 case PPPOL2TP_SO_RECVSEQ:
1352 if ((val != 0) && (val != 1)) {
1356 session->recv_seq = !!val;
1357 l2tp_info(session, L2TP_MSG_CONTROL,
1358 "%s: set recv_seq=%d\n",
1359 session->name, session->recv_seq);
1362 case PPPOL2TP_SO_SENDSEQ:
1363 if ((val != 0) && (val != 1)) {
1367 session->send_seq = !!val;
1369 struct pppox_sock *po = pppox_sk(sk);
1371 po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
1372 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1374 l2tp_session_set_header_len(session, session->tunnel->version);
1375 l2tp_info(session, L2TP_MSG_CONTROL,
1376 "%s: set send_seq=%d\n",
1377 session->name, session->send_seq);
1380 case PPPOL2TP_SO_LNSMODE:
1381 if ((val != 0) && (val != 1)) {
1385 session->lns_mode = !!val;
1386 l2tp_info(session, L2TP_MSG_CONTROL,
1387 "%s: set lns_mode=%d\n",
1388 session->name, session->lns_mode);
1391 case PPPOL2TP_SO_DEBUG:
1392 session->debug = val;
1393 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set debug=%x\n",
1394 session->name, session->debug);
1397 case PPPOL2TP_SO_REORDERTO:
1398 session->reorder_timeout = msecs_to_jiffies(val);
1399 l2tp_info(session, L2TP_MSG_CONTROL,
1400 "%s: set reorder_timeout=%d\n",
1401 session->name, session->reorder_timeout);
1412 /* Main setsockopt() entry point.
1413 * Does API checks, then calls either the tunnel or session setsockopt
1414 * handler, according to whether the PPPoL2TP socket is a for a regular
1415 * session or the special tunnel type.
1417 static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
1418 char __user *optval, unsigned int optlen)
1420 struct sock *sk = sock->sk;
1421 struct l2tp_session *session;
1422 struct l2tp_tunnel *tunnel;
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 if ((session->session_id == 0) &&
1448 (session->peer_session_id == 0)) {
1449 tunnel = session->tunnel;
1450 err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
1452 err = pppol2tp_session_setsockopt(sk, session, optname, val);
1460 /* Tunnel getsockopt helper. Called with sock locked.
1462 static int pppol2tp_tunnel_getsockopt(struct sock *sk,
1463 struct l2tp_tunnel *tunnel,
1464 int optname, int *val)
1469 case PPPOL2TP_SO_DEBUG:
1470 *val = tunnel->debug;
1471 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get debug=%x\n",
1472 tunnel->name, tunnel->debug);
1483 /* Session getsockopt helper. Called with sock locked.
1485 static int pppol2tp_session_getsockopt(struct sock *sk,
1486 struct l2tp_session *session,
1487 int optname, int *val)
1492 case PPPOL2TP_SO_RECVSEQ:
1493 *val = session->recv_seq;
1494 l2tp_info(session, L2TP_MSG_CONTROL,
1495 "%s: get recv_seq=%d\n", session->name, *val);
1498 case PPPOL2TP_SO_SENDSEQ:
1499 *val = session->send_seq;
1500 l2tp_info(session, L2TP_MSG_CONTROL,
1501 "%s: get send_seq=%d\n", session->name, *val);
1504 case PPPOL2TP_SO_LNSMODE:
1505 *val = session->lns_mode;
1506 l2tp_info(session, L2TP_MSG_CONTROL,
1507 "%s: get lns_mode=%d\n", session->name, *val);
1510 case PPPOL2TP_SO_DEBUG:
1511 *val = session->debug;
1512 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get debug=%d\n",
1513 session->name, *val);
1516 case PPPOL2TP_SO_REORDERTO:
1517 *val = (int) jiffies_to_msecs(session->reorder_timeout);
1518 l2tp_info(session, L2TP_MSG_CONTROL,
1519 "%s: get reorder_timeout=%d\n", session->name, *val);
1529 /* Main getsockopt() entry point.
1530 * Does API checks, then calls either the tunnel or session getsockopt
1531 * handler, according to whether the PPPoX socket is a for a regular session
1532 * or the special tunnel type.
1534 static int pppol2tp_getsockopt(struct socket *sock, int level, int optname,
1535 char __user *optval, int __user *optlen)
1537 struct sock *sk = sock->sk;
1538 struct l2tp_session *session;
1539 struct l2tp_tunnel *tunnel;
1543 if (level != SOL_PPPOL2TP)
1546 if (get_user(len, optlen))
1549 len = min_t(unsigned int, len, sizeof(int));
1555 if (sk->sk_user_data == NULL)
1558 /* Get the session context */
1560 session = pppol2tp_sock_to_session(sk);
1561 if (session == NULL)
1564 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1565 if ((session->session_id == 0) &&
1566 (session->peer_session_id == 0)) {
1567 tunnel = session->tunnel;
1568 err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
1572 err = pppol2tp_session_getsockopt(sk, session, optname, &val);
1578 if (put_user(len, optlen))
1581 if (copy_to_user((void __user *) optval, &val, len))
1592 /*****************************************************************************
1593 * /proc filesystem for debug
1594 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1595 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1596 *****************************************************************************/
1598 static unsigned int pppol2tp_net_id;
1600 #ifdef CONFIG_PROC_FS
1602 struct pppol2tp_seq_data {
1603 struct seq_net_private p;
1604 int tunnel_idx; /* current tunnel */
1605 int session_idx; /* index of session within current tunnel */
1606 struct l2tp_tunnel *tunnel;
1607 struct l2tp_session *session; /* NULL means get next tunnel */
1610 static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
1612 /* Drop reference taken during previous invocation */
1614 l2tp_tunnel_dec_refcount(pd->tunnel);
1617 pd->tunnel = l2tp_tunnel_get_nth(net, pd->tunnel_idx);
1620 /* Only accept L2TPv2 tunnels */
1621 if (!pd->tunnel || pd->tunnel->version == 2)
1624 l2tp_tunnel_dec_refcount(pd->tunnel);
1628 static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
1630 /* Drop reference taken during previous invocation */
1632 l2tp_session_dec_refcount(pd->session);
1634 pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx);
1637 if (pd->session == NULL) {
1638 pd->session_idx = 0;
1639 pppol2tp_next_tunnel(net, pd);
1643 static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
1645 struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
1652 BUG_ON(m->private == NULL);
1654 net = seq_file_net(m);
1656 if (pd->tunnel == NULL)
1657 pppol2tp_next_tunnel(net, pd);
1659 pppol2tp_next_session(net, pd);
1661 /* NULL tunnel and session indicates end of list */
1662 if ((pd->tunnel == NULL) && (pd->session == NULL))
1669 static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
1675 static void pppol2tp_seq_stop(struct seq_file *p, void *v)
1677 struct pppol2tp_seq_data *pd = v;
1679 if (!pd || pd == SEQ_START_TOKEN)
1682 /* Drop reference taken by last invocation of pppol2tp_next_session()
1683 * or pppol2tp_next_tunnel().
1686 l2tp_session_dec_refcount(pd->session);
1690 l2tp_tunnel_dec_refcount(pd->tunnel);
1695 static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
1697 struct l2tp_tunnel *tunnel = v;
1699 seq_printf(m, "\nTUNNEL '%s', %c %d\n",
1701 (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
1702 refcount_read(&tunnel->ref_count) - 1);
1703 seq_printf(m, " %08x %ld/%ld/%ld %ld/%ld/%ld\n",
1705 atomic_long_read(&tunnel->stats.tx_packets),
1706 atomic_long_read(&tunnel->stats.tx_bytes),
1707 atomic_long_read(&tunnel->stats.tx_errors),
1708 atomic_long_read(&tunnel->stats.rx_packets),
1709 atomic_long_read(&tunnel->stats.rx_bytes),
1710 atomic_long_read(&tunnel->stats.rx_errors));
1713 static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
1715 struct l2tp_session *session = v;
1716 struct l2tp_tunnel *tunnel = session->tunnel;
1717 unsigned char state;
1724 struct inet_sock *inet = inet_sk(tunnel->sock);
1725 ip = ntohl(inet->inet_saddr);
1726 port = ntohs(inet->inet_sport);
1729 sk = pppol2tp_session_get_sock(session);
1731 state = sk->sk_state;
1732 user_data_ok = (session == sk->sk_user_data) ? 'Y' : 'N';
1738 seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
1739 "%04X/%04X %d %c\n",
1740 session->name, ip, port,
1742 session->session_id,
1743 tunnel->peer_tunnel_id,
1744 session->peer_session_id,
1745 state, user_data_ok);
1746 seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n",
1747 session->mtu, session->mru,
1748 session->recv_seq ? 'R' : '-',
1749 session->send_seq ? 'S' : '-',
1750 session->lns_mode ? "LNS" : "LAC",
1752 jiffies_to_msecs(session->reorder_timeout));
1753 seq_printf(m, " %hu/%hu %ld/%ld/%ld %ld/%ld/%ld\n",
1754 session->nr, session->ns,
1755 atomic_long_read(&session->stats.tx_packets),
1756 atomic_long_read(&session->stats.tx_bytes),
1757 atomic_long_read(&session->stats.tx_errors),
1758 atomic_long_read(&session->stats.rx_packets),
1759 atomic_long_read(&session->stats.rx_bytes),
1760 atomic_long_read(&session->stats.rx_errors));
1763 struct pppox_sock *po = pppox_sk(sk);
1765 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
1770 static int pppol2tp_seq_show(struct seq_file *m, void *v)
1772 struct pppol2tp_seq_data *pd = v;
1774 /* display header on line 1 */
1775 if (v == SEQ_START_TOKEN) {
1776 seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
1777 seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
1778 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1779 seq_puts(m, " SESSION name, addr/port src-tid/sid "
1780 "dest-tid/sid state user-data-ok\n");
1781 seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1782 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1787 pppol2tp_seq_tunnel_show(m, pd->tunnel);
1789 pppol2tp_seq_session_show(m, pd->session);
1795 static const struct seq_operations pppol2tp_seq_ops = {
1796 .start = pppol2tp_seq_start,
1797 .next = pppol2tp_seq_next,
1798 .stop = pppol2tp_seq_stop,
1799 .show = pppol2tp_seq_show,
1801 #endif /* CONFIG_PROC_FS */
1803 /*****************************************************************************
1805 *****************************************************************************/
1807 static __net_init int pppol2tp_init_net(struct net *net)
1809 struct proc_dir_entry *pde;
1812 pde = proc_create_net("pppol2tp", 0444, net->proc_net,
1813 &pppol2tp_seq_ops, sizeof(struct pppol2tp_seq_data));
1823 static __net_exit void pppol2tp_exit_net(struct net *net)
1825 remove_proc_entry("pppol2tp", net->proc_net);
1828 static struct pernet_operations pppol2tp_net_ops = {
1829 .init = pppol2tp_init_net,
1830 .exit = pppol2tp_exit_net,
1831 .id = &pppol2tp_net_id,
1834 /*****************************************************************************
1836 *****************************************************************************/
1838 static const struct proto_ops pppol2tp_ops = {
1840 .owner = THIS_MODULE,
1841 .release = pppol2tp_release,
1842 .bind = sock_no_bind,
1843 .connect = pppol2tp_connect,
1844 .socketpair = sock_no_socketpair,
1845 .accept = sock_no_accept,
1846 .getname = pppol2tp_getname,
1847 .poll = datagram_poll,
1848 .listen = sock_no_listen,
1849 .shutdown = sock_no_shutdown,
1850 .setsockopt = pppol2tp_setsockopt,
1851 .getsockopt = pppol2tp_getsockopt,
1852 .sendmsg = pppol2tp_sendmsg,
1853 .recvmsg = pppol2tp_recvmsg,
1854 .mmap = sock_no_mmap,
1855 .ioctl = pppox_ioctl,
1858 static const struct pppox_proto pppol2tp_proto = {
1859 .create = pppol2tp_create,
1860 .ioctl = pppol2tp_ioctl,
1861 .owner = THIS_MODULE,
1864 #ifdef CONFIG_L2TP_V3
1866 static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = {
1867 .session_create = pppol2tp_session_create,
1868 .session_delete = l2tp_session_delete,
1871 #endif /* CONFIG_L2TP_V3 */
1873 static int __init pppol2tp_init(void)
1877 err = register_pernet_device(&pppol2tp_net_ops);
1881 err = proto_register(&pppol2tp_sk_proto, 0);
1883 goto out_unregister_pppol2tp_pernet;
1885 err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
1887 goto out_unregister_pppol2tp_proto;
1889 #ifdef CONFIG_L2TP_V3
1890 err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops);
1892 goto out_unregister_pppox;
1895 pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION);
1900 #ifdef CONFIG_L2TP_V3
1901 out_unregister_pppox:
1902 unregister_pppox_proto(PX_PROTO_OL2TP);
1904 out_unregister_pppol2tp_proto:
1905 proto_unregister(&pppol2tp_sk_proto);
1906 out_unregister_pppol2tp_pernet:
1907 unregister_pernet_device(&pppol2tp_net_ops);
1911 static void __exit pppol2tp_exit(void)
1913 #ifdef CONFIG_L2TP_V3
1914 l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP);
1916 unregister_pppox_proto(PX_PROTO_OL2TP);
1917 proto_unregister(&pppol2tp_sk_proto);
1918 unregister_pernet_device(&pppol2tp_net_ops);
1921 module_init(pppol2tp_init);
1922 module_exit(pppol2tp_exit);
1924 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1925 MODULE_DESCRIPTION("PPP over L2TP over UDP");
1926 MODULE_LICENSE("GPL");
1927 MODULE_VERSION(PPPOL2TP_DRV_VERSION);
1928 MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_OL2TP);
1929 MODULE_ALIAS_L2TP_PWTYPE(7);