1 /*****************************************************************************
2 * Linux PPP over L2TP (PPPoX/PPPoL2TP) Sockets
4 * PPPoX --- Generic PPP encapsulation socket family
5 * PPPoL2TP --- PPP over L2TP (RFC 2661)
9 * Authors: James Chapman (jchapman@katalix.com)
11 * Based on original work by Martijn van Oosterhout <kleptog@svana.org>
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
21 /* This driver handles only L2TP data frames; control frames are handled by a
22 * userspace application.
24 * To send data in an L2TP session, userspace opens a PPPoL2TP socket and
25 * attaches it to a bound UDP socket with local tunnel_id / session_id and
26 * peer tunnel_id / session_id set. Data can then be sent or received using
27 * regular socket sendmsg() / recvmsg() calls. Kernel parameters of the socket
28 * can be read or modified using ioctl() or [gs]etsockopt() calls.
30 * When a PPPoL2TP socket is connected with local and peer session_id values
31 * zero, the socket is treated as a special tunnel management socket.
33 * Here's example userspace code to create a socket for sending/receiving data
34 * over an L2TP session:-
36 * struct sockaddr_pppol2tp sax;
40 * fd = socket(AF_PPPOX, SOCK_DGRAM, PX_PROTO_OL2TP);
42 * sax.sa_family = AF_PPPOX;
43 * sax.sa_protocol = PX_PROTO_OL2TP;
44 * sax.pppol2tp.fd = tunnel_fd; // bound UDP socket
45 * sax.pppol2tp.addr.sin_addr.s_addr = addr->sin_addr.s_addr;
46 * sax.pppol2tp.addr.sin_port = addr->sin_port;
47 * sax.pppol2tp.addr.sin_family = AF_INET;
48 * sax.pppol2tp.s_tunnel = tunnel_id;
49 * sax.pppol2tp.s_session = session_id;
50 * sax.pppol2tp.d_tunnel = peer_tunnel_id;
51 * sax.pppol2tp.d_session = peer_session_id;
53 * session_fd = connect(fd, (struct sockaddr *)&sax, sizeof(sax));
55 * A pppd plugin that allows PPP traffic to be carried over L2TP using
56 * this driver is available from the OpenL2TP project at
57 * http://openl2tp.sourceforge.net.
60 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
62 #include <linux/module.h>
63 #include <linux/string.h>
64 #include <linux/list.h>
65 #include <linux/uaccess.h>
67 #include <linux/kernel.h>
68 #include <linux/spinlock.h>
69 #include <linux/kthread.h>
70 #include <linux/sched.h>
71 #include <linux/slab.h>
72 #include <linux/errno.h>
73 #include <linux/jiffies.h>
75 #include <linux/netdevice.h>
76 #include <linux/net.h>
77 #include <linux/inetdevice.h>
78 #include <linux/skbuff.h>
79 #include <linux/init.h>
81 #include <linux/udp.h>
82 #include <linux/if_pppox.h>
83 #include <linux/if_pppol2tp.h>
85 #include <linux/ppp_channel.h>
86 #include <linux/ppp_defs.h>
87 #include <linux/ppp-ioctl.h>
88 #include <linux/file.h>
89 #include <linux/hash.h>
90 #include <linux/sort.h>
91 #include <linux/proc_fs.h>
92 #include <linux/l2tp.h>
93 #include <linux/nsproxy.h>
94 #include <net/net_namespace.h>
95 #include <net/netns/generic.h>
100 #include <net/inet_common.h>
102 #include <asm/byteorder.h>
103 #include <linux/atomic.h>
105 #include "l2tp_core.h"
107 #define PPPOL2TP_DRV_VERSION "V2.0"
109 /* Space for UDP, L2TP and PPP headers */
110 #define PPPOL2TP_HEADER_OVERHEAD 40
112 /* Number of bytes to build transmit L2TP headers.
113 * Unfortunately the size is different depending on whether sequence numbers
116 #define PPPOL2TP_L2TP_HDR_SIZE_SEQ 10
117 #define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ 6
119 /* Private data of each session. This data lives at the end of struct
120 * l2tp_session, referenced via session->priv[].
122 struct pppol2tp_session {
123 int owner; /* pid that opened the socket */
125 struct mutex sk_lock; /* Protects .sk */
126 struct sock __rcu *sk; /* Pointer to the session
128 struct sock *__sk; /* Copy of .sk, for cleanup */
129 struct rcu_head rcu; /* For asynchronous release */
130 struct sock *tunnel_sock; /* Pointer to the tunnel UDP
132 int flags; /* accessed by PPPIOCGFLAGS.
136 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb);
138 static const struct ppp_channel_ops pppol2tp_chan_ops = {
139 .start_xmit = pppol2tp_xmit,
142 static const struct proto_ops pppol2tp_ops;
144 /* Retrieves the pppol2tp socket associated to a session.
145 * A reference is held on the returned socket, so this function must be paired
148 static struct sock *pppol2tp_session_get_sock(struct l2tp_session *session)
150 struct pppol2tp_session *ps = l2tp_session_priv(session);
154 sk = rcu_dereference(ps->sk);
162 /* Helpers to obtain tunnel/session contexts from sockets.
164 static inline struct l2tp_session *pppol2tp_sock_to_session(struct sock *sk)
166 struct l2tp_session *session;
172 session = (struct l2tp_session *)(sk->sk_user_data);
173 if (session == NULL) {
178 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
184 /*****************************************************************************
185 * Receive data handling
186 *****************************************************************************/
188 static int pppol2tp_recv_payload_hook(struct sk_buff *skb)
190 /* Skip PPP header, if present. In testing, Microsoft L2TP clients
191 * don't send the PPP header (PPP header compression enabled), but
192 * other clients can include the header. So we cope with both cases
193 * here. The PPP header is always FF03 when using L2TP.
195 * Note that skb->data[] isn't dereferenced from a u16 ptr here since
196 * the field may be unaligned.
198 if (!pskb_may_pull(skb, 2))
201 if ((skb->data[0] == PPP_ALLSTATIONS) && (skb->data[1] == PPP_UI))
207 /* Receive message. This is the recvmsg for the PPPoL2TP socket.
209 static int pppol2tp_recvmsg(struct socket *sock, struct msghdr *msg,
210 size_t len, int flags)
214 struct sock *sk = sock->sk;
217 if (sk->sk_state & PPPOX_BOUND)
221 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
222 flags & MSG_DONTWAIT, &err);
228 else if (len < skb->len)
229 msg->msg_flags |= MSG_TRUNC;
231 err = skb_copy_datagram_msg(skb, 0, msg, len);
232 if (likely(err == 0))
240 static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
242 struct pppol2tp_session *ps = l2tp_session_priv(session);
243 struct sock *sk = NULL;
245 /* If the socket is bound, send it in to PPP's input queue. Otherwise
246 * queue it on the session socket.
249 sk = rcu_dereference(ps->sk);
253 if (sk->sk_state & PPPOX_BOUND) {
254 struct pppox_sock *po;
256 l2tp_dbg(session, L2TP_MSG_DATA,
257 "%s: recv %d byte data frame, passing to ppp\n",
258 session->name, data_len);
261 ppp_input(&po->chan, skb);
263 l2tp_dbg(session, L2TP_MSG_DATA,
264 "%s: recv %d byte data frame, passing to L2TP socket\n",
265 session->name, data_len);
267 if (sock_queue_rcv_skb(sk, skb) < 0) {
268 atomic_long_inc(&session->stats.rx_errors);
278 l2tp_info(session, L2TP_MSG_DATA, "%s: no socket\n", session->name);
282 /************************************************************************
284 ***********************************************************************/
286 /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here
287 * when a user application does a sendmsg() on the session socket. L2TP and
288 * PPP headers must be inserted into the user's data.
290 static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m,
293 struct sock *sk = sock->sk;
296 struct l2tp_session *session;
297 struct l2tp_tunnel *tunnel;
298 struct pppol2tp_session *ps;
302 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
305 /* Get session and tunnel contexts */
307 session = pppol2tp_sock_to_session(sk);
311 ps = l2tp_session_priv(session);
312 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
316 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
318 /* Allocate a socket buffer */
320 skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) +
321 uhlen + session->hdr_len +
322 2 + total_len, /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */
325 goto error_put_sess_tun;
327 /* Reserve space for headers. */
328 skb_reserve(skb, NET_SKB_PAD);
329 skb_reset_network_header(skb);
330 skb_reserve(skb, sizeof(struct iphdr));
331 skb_reset_transport_header(skb);
332 skb_reserve(skb, uhlen);
335 skb->data[0] = PPP_ALLSTATIONS;
336 skb->data[1] = PPP_UI;
339 /* Copy user data into skb */
340 error = memcpy_from_msg(skb_put(skb, total_len), m, total_len);
343 goto error_put_sess_tun;
347 l2tp_xmit_skb(session, skb, session->hdr_len);
350 sock_put(ps->tunnel_sock);
356 sock_put(ps->tunnel_sock);
363 /* Transmit function called by generic PPP driver. Sends PPP frame
364 * over PPPoL2TP socket.
366 * This is almost the same as pppol2tp_sendmsg(), but rather than
367 * being called with a msghdr from userspace, it is called with a skb
370 * The supplied skb from ppp doesn't have enough headroom for the
371 * insertion of L2TP, UDP and IP headers so we need to allocate more
372 * headroom in the skb. This will create a cloned skb. But we must be
373 * careful in the error case because the caller will expect to free
374 * the skb it supplied, not our cloned skb. So we take care to always
375 * leave the original skb unfreed if we return an error.
377 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
379 struct sock *sk = (struct sock *) chan->private;
381 struct l2tp_session *session;
382 struct l2tp_tunnel *tunnel;
383 struct pppol2tp_session *ps;
386 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
389 /* Get session and tunnel contexts from the socket */
390 session = pppol2tp_sock_to_session(sk);
394 ps = l2tp_session_priv(session);
395 sk_tun = ps->tunnel_sock;
398 tunnel = l2tp_sock_to_tunnel(sk_tun);
402 uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
403 headroom = NET_SKB_PAD +
404 sizeof(struct iphdr) + /* IP header */
405 uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */
406 session->hdr_len + /* L2TP header */
407 2; /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */
408 if (skb_cow_head(skb, headroom))
409 goto abort_put_sess_tun;
411 /* Setup PPP header */
413 skb->data[0] = PPP_ALLSTATIONS;
414 skb->data[1] = PPP_UI;
417 l2tp_xmit_skb(session, skb, session->hdr_len);
429 /* Free the original skb */
434 /*****************************************************************************
435 * Session (and tunnel control) socket create/destroy.
436 *****************************************************************************/
438 /* Called by l2tp_core when a session socket is being closed.
440 static void pppol2tp_session_close(struct l2tp_session *session)
444 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
446 sk = pppol2tp_session_get_sock(session);
449 inet_shutdown(sk->sk_socket, SEND_SHUTDOWN);
454 /* Really kill the session socket. (Called from sock_put() if
457 static void pppol2tp_session_destruct(struct sock *sk)
459 struct l2tp_session *session = sk->sk_user_data;
461 skb_queue_purge(&sk->sk_receive_queue);
462 skb_queue_purge(&sk->sk_write_queue);
465 sk->sk_user_data = NULL;
466 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
467 l2tp_session_dec_refcount(session);
471 static void pppol2tp_put_sk(struct rcu_head *head)
473 struct pppol2tp_session *ps;
475 ps = container_of(head, typeof(*ps), rcu);
479 /* Called when the PPPoX socket (session) is closed.
481 static int pppol2tp_release(struct socket *sock)
483 struct sock *sk = sock->sk;
484 struct l2tp_session *session;
492 if (sock_flag(sk, SOCK_DEAD) != 0)
495 pppox_unbind_sock(sk);
497 /* Signal the death of the socket. */
498 sk->sk_state = PPPOX_DEAD;
502 session = pppol2tp_sock_to_session(sk);
504 if (session != NULL) {
505 struct pppol2tp_session *ps;
507 l2tp_session_delete(session);
509 ps = l2tp_session_priv(session);
510 mutex_lock(&ps->sk_lock);
511 ps->__sk = rcu_dereference_protected(ps->sk,
512 lockdep_is_held(&ps->sk_lock));
513 RCU_INIT_POINTER(ps->sk, NULL);
514 mutex_unlock(&ps->sk_lock);
515 call_rcu(&ps->rcu, pppol2tp_put_sk);
517 /* Rely on the sock_put() call at the end of the function for
518 * dropping the reference held by pppol2tp_sock_to_session().
519 * The last reference will be dropped by pppol2tp_put_sk().
524 /* This will delete the session context via
525 * pppol2tp_session_destruct() if the socket's refcnt drops to
537 static struct proto pppol2tp_sk_proto = {
539 .owner = THIS_MODULE,
540 .obj_size = sizeof(struct pppox_sock),
543 static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb)
547 rc = l2tp_udp_encap_recv(sk, skb);
551 return NET_RX_SUCCESS;
554 /* socket() handler. Initialize a new struct sock.
556 static int pppol2tp_create(struct net *net, struct socket *sock, int kern)
561 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto, kern);
565 sock_init_data(sock, sk);
567 sock->state = SS_UNCONNECTED;
568 sock->ops = &pppol2tp_ops;
570 sk->sk_backlog_rcv = pppol2tp_backlog_recv;
571 sk->sk_protocol = PX_PROTO_OL2TP;
572 sk->sk_family = PF_PPPOX;
573 sk->sk_state = PPPOX_NONE;
574 sk->sk_type = SOCK_STREAM;
575 sk->sk_destruct = pppol2tp_session_destruct;
583 #if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
584 static void pppol2tp_show(struct seq_file *m, void *arg)
586 struct l2tp_session *session = arg;
589 sk = pppol2tp_session_get_sock(session);
591 struct pppox_sock *po = pppox_sk(sk);
593 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
599 static void pppol2tp_session_init(struct l2tp_session *session)
601 struct pppol2tp_session *ps;
602 struct dst_entry *dst;
604 session->recv_skb = pppol2tp_recv;
605 session->session_close = pppol2tp_session_close;
606 #if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
607 session->show = pppol2tp_show;
610 ps = l2tp_session_priv(session);
611 mutex_init(&ps->sk_lock);
612 ps->tunnel_sock = session->tunnel->sock;
613 ps->owner = current->pid;
615 /* If PMTU discovery was enabled, use the MTU that was discovered */
616 dst = sk_dst_get(session->tunnel->sock);
618 u32 pmtu = dst_mtu(dst);
621 session->mtu = pmtu - PPPOL2TP_HEADER_OVERHEAD;
622 session->mru = pmtu - PPPOL2TP_HEADER_OVERHEAD;
628 /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
630 static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
631 int sockaddr_len, int flags)
633 struct sock *sk = sock->sk;
634 struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr;
635 struct pppox_sock *po = pppox_sk(sk);
636 struct l2tp_session *session = NULL;
637 struct l2tp_tunnel *tunnel;
638 struct pppol2tp_session *ps;
639 struct l2tp_session_cfg cfg = { 0, };
641 u32 tunnel_id, peer_tunnel_id;
642 u32 session_id, peer_session_id;
643 bool drop_refcnt = false;
650 if (sp->sa_protocol != PX_PROTO_OL2TP)
653 /* Check for already bound sockets */
655 if (sk->sk_state & PPPOX_CONNECTED)
658 /* We don't supporting rebinding anyway */
660 if (sk->sk_user_data)
661 goto end; /* socket is already attached */
663 /* Get params from socket address. Handle L2TPv2 and L2TPv3.
664 * This is nasty because there are different sockaddr_pppol2tp
665 * structs for L2TPv2, L2TPv3, over IPv4 and IPv6. We use
666 * the sockaddr size to determine which structure the caller
670 if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) {
671 fd = sp->pppol2tp.fd;
672 tunnel_id = sp->pppol2tp.s_tunnel;
673 peer_tunnel_id = sp->pppol2tp.d_tunnel;
674 session_id = sp->pppol2tp.s_session;
675 peer_session_id = sp->pppol2tp.d_session;
676 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) {
677 struct sockaddr_pppol2tpv3 *sp3 =
678 (struct sockaddr_pppol2tpv3 *) sp;
680 fd = sp3->pppol2tp.fd;
681 tunnel_id = sp3->pppol2tp.s_tunnel;
682 peer_tunnel_id = sp3->pppol2tp.d_tunnel;
683 session_id = sp3->pppol2tp.s_session;
684 peer_session_id = sp3->pppol2tp.d_session;
685 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpin6)) {
686 struct sockaddr_pppol2tpin6 *sp6 =
687 (struct sockaddr_pppol2tpin6 *) sp;
688 fd = sp6->pppol2tp.fd;
689 tunnel_id = sp6->pppol2tp.s_tunnel;
690 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
691 session_id = sp6->pppol2tp.s_session;
692 peer_session_id = sp6->pppol2tp.d_session;
693 } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3in6)) {
694 struct sockaddr_pppol2tpv3in6 *sp6 =
695 (struct sockaddr_pppol2tpv3in6 *) sp;
697 fd = sp6->pppol2tp.fd;
698 tunnel_id = sp6->pppol2tp.s_tunnel;
699 peer_tunnel_id = sp6->pppol2tp.d_tunnel;
700 session_id = sp6->pppol2tp.s_session;
701 peer_session_id = sp6->pppol2tp.d_session;
704 goto end; /* bad socket address */
707 /* Don't bind if tunnel_id is 0 */
712 tunnel = l2tp_tunnel_find(sock_net(sk), tunnel_id);
714 /* Special case: create tunnel context if session_id and
715 * peer_session_id is 0. Otherwise look up tunnel using supplied
718 if ((session_id == 0) && (peer_session_id == 0)) {
719 if (tunnel == NULL) {
720 struct l2tp_tunnel_cfg tcfg = {
721 .encap = L2TP_ENCAPTYPE_UDP,
724 error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, &tcfg, &tunnel);
729 /* Error if we can't find the tunnel */
734 /* Error if socket is not prepped */
735 if (tunnel->sock == NULL)
739 if (tunnel->recv_payload_hook == NULL)
740 tunnel->recv_payload_hook = pppol2tp_recv_payload_hook;
742 if (tunnel->peer_tunnel_id == 0)
743 tunnel->peer_tunnel_id = peer_tunnel_id;
745 session = l2tp_session_get(sock_net(sk), tunnel, session_id, false);
748 ps = l2tp_session_priv(session);
750 /* Using a pre-existing session is fine as long as it hasn't
751 * been connected yet.
753 mutex_lock(&ps->sk_lock);
754 if (rcu_dereference_protected(ps->sk,
755 lockdep_is_held(&ps->sk_lock))) {
756 mutex_unlock(&ps->sk_lock);
761 /* consistency checks */
762 if (ps->tunnel_sock != tunnel->sock) {
763 mutex_unlock(&ps->sk_lock);
768 /* Default MTU must allow space for UDP/L2TP/PPP headers */
769 cfg.mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
772 session = l2tp_session_create(sizeof(struct pppol2tp_session),
774 peer_session_id, &cfg);
775 if (IS_ERR(session)) {
776 error = PTR_ERR(session);
780 pppol2tp_session_init(session);
781 ps = l2tp_session_priv(session);
782 l2tp_session_inc_refcount(session);
784 mutex_lock(&ps->sk_lock);
785 error = l2tp_session_register(session, tunnel);
787 mutex_unlock(&ps->sk_lock);
794 /* Special case: if source & dest session_id == 0x0000, this
795 * socket is being created to manage the tunnel. Just set up
796 * the internal context for use by ioctl() and sockopt()
799 if ((session->session_id == 0) &&
800 (session->peer_session_id == 0)) {
805 /* The only header we need to worry about is the L2TP
806 * header. This size is different depending on whether
807 * sequence numbers are enabled for the data channel.
809 po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
811 po->chan.private = sk;
812 po->chan.ops = &pppol2tp_chan_ops;
813 po->chan.mtu = session->mtu;
815 error = ppp_register_net_channel(sock_net(sk), &po->chan);
817 mutex_unlock(&ps->sk_lock);
822 /* This is how we get the session context from the socket. */
823 sk->sk_user_data = session;
824 rcu_assign_pointer(ps->sk, sk);
825 mutex_unlock(&ps->sk_lock);
827 /* Keep the reference we've grabbed on the session: sk doesn't expect
828 * the session to disappear. pppol2tp_session_destruct() is responsible
833 sk->sk_state = PPPOX_CONNECTED;
834 l2tp_info(session, L2TP_MSG_CONTROL, "%s: created\n",
839 l2tp_session_dec_refcount(session);
845 #ifdef CONFIG_L2TP_V3
847 /* Called when creating sessions via the netlink interface. */
848 static int pppol2tp_session_create(struct net *net, struct l2tp_tunnel *tunnel,
849 u32 session_id, u32 peer_session_id,
850 struct l2tp_session_cfg *cfg)
853 struct l2tp_session *session;
855 /* Error if tunnel socket is not prepped */
861 /* Default MTU values. */
863 cfg->mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
867 /* Allocate and initialize a new session context. */
868 session = l2tp_session_create(sizeof(struct pppol2tp_session),
870 peer_session_id, cfg);
871 if (IS_ERR(session)) {
872 error = PTR_ERR(session);
876 pppol2tp_session_init(session);
878 error = l2tp_session_register(session, tunnel);
890 #endif /* CONFIG_L2TP_V3 */
892 /* getname() support.
894 static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
895 int *usockaddr_len, int peer)
899 struct l2tp_session *session;
900 struct l2tp_tunnel *tunnel;
901 struct sock *sk = sock->sk;
902 struct inet_sock *inet;
903 struct pppol2tp_session *pls;
908 if (!(sk->sk_state & PPPOX_CONNECTED))
912 session = pppol2tp_sock_to_session(sk);
916 pls = l2tp_session_priv(session);
917 tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock);
921 inet = inet_sk(tunnel->sock);
922 if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) {
923 struct sockaddr_pppol2tp sp;
926 sp.sa_family = AF_PPPOX;
927 sp.sa_protocol = PX_PROTO_OL2TP;
928 sp.pppol2tp.fd = tunnel->fd;
929 sp.pppol2tp.pid = pls->owner;
930 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
931 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
932 sp.pppol2tp.s_session = session->session_id;
933 sp.pppol2tp.d_session = session->peer_session_id;
934 sp.pppol2tp.addr.sin_family = AF_INET;
935 sp.pppol2tp.addr.sin_port = inet->inet_dport;
936 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
937 memcpy(uaddr, &sp, len);
938 #if IS_ENABLED(CONFIG_IPV6)
939 } else if ((tunnel->version == 2) &&
940 (tunnel->sock->sk_family == AF_INET6)) {
941 struct sockaddr_pppol2tpin6 sp;
945 sp.sa_family = AF_PPPOX;
946 sp.sa_protocol = PX_PROTO_OL2TP;
947 sp.pppol2tp.fd = tunnel->fd;
948 sp.pppol2tp.pid = pls->owner;
949 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
950 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
951 sp.pppol2tp.s_session = session->session_id;
952 sp.pppol2tp.d_session = session->peer_session_id;
953 sp.pppol2tp.addr.sin6_family = AF_INET6;
954 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
955 memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
956 sizeof(tunnel->sock->sk_v6_daddr));
957 memcpy(uaddr, &sp, len);
958 } else if ((tunnel->version == 3) &&
959 (tunnel->sock->sk_family == AF_INET6)) {
960 struct sockaddr_pppol2tpv3in6 sp;
964 sp.sa_family = AF_PPPOX;
965 sp.sa_protocol = PX_PROTO_OL2TP;
966 sp.pppol2tp.fd = tunnel->fd;
967 sp.pppol2tp.pid = pls->owner;
968 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
969 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
970 sp.pppol2tp.s_session = session->session_id;
971 sp.pppol2tp.d_session = session->peer_session_id;
972 sp.pppol2tp.addr.sin6_family = AF_INET6;
973 sp.pppol2tp.addr.sin6_port = inet->inet_dport;
974 memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr,
975 sizeof(tunnel->sock->sk_v6_daddr));
976 memcpy(uaddr, &sp, len);
978 } else if (tunnel->version == 3) {
979 struct sockaddr_pppol2tpv3 sp;
982 sp.sa_family = AF_PPPOX;
983 sp.sa_protocol = PX_PROTO_OL2TP;
984 sp.pppol2tp.fd = tunnel->fd;
985 sp.pppol2tp.pid = pls->owner;
986 sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
987 sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
988 sp.pppol2tp.s_session = session->session_id;
989 sp.pppol2tp.d_session = session->peer_session_id;
990 sp.pppol2tp.addr.sin_family = AF_INET;
991 sp.pppol2tp.addr.sin_port = inet->inet_dport;
992 sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
993 memcpy(uaddr, &sp, len);
996 *usockaddr_len = len;
999 sock_put(pls->tunnel_sock);
1006 /****************************************************************************
1009 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1010 * sockets. However, in order to control kernel tunnel features, we allow
1011 * userspace to create a special "tunnel" PPPoX socket which is used for
1012 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
1013 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
1015 ****************************************************************************/
1017 static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest,
1018 struct l2tp_stats *stats)
1020 dest->tx_packets = atomic_long_read(&stats->tx_packets);
1021 dest->tx_bytes = atomic_long_read(&stats->tx_bytes);
1022 dest->tx_errors = atomic_long_read(&stats->tx_errors);
1023 dest->rx_packets = atomic_long_read(&stats->rx_packets);
1024 dest->rx_bytes = atomic_long_read(&stats->rx_bytes);
1025 dest->rx_seq_discards = atomic_long_read(&stats->rx_seq_discards);
1026 dest->rx_oos_packets = atomic_long_read(&stats->rx_oos_packets);
1027 dest->rx_errors = atomic_long_read(&stats->rx_errors);
1030 /* Session ioctl helper.
1032 static int pppol2tp_session_ioctl(struct l2tp_session *session,
1033 unsigned int cmd, unsigned long arg)
1038 int val = (int) arg;
1039 struct pppol2tp_session *ps = l2tp_session_priv(session);
1040 struct l2tp_tunnel *tunnel = session->tunnel;
1041 struct pppol2tp_ioc_stats stats;
1043 l2tp_dbg(session, L2TP_MSG_CONTROL,
1044 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
1045 session->name, cmd, arg);
1047 sk = pppol2tp_session_get_sock(session);
1054 if (!(sk->sk_state & PPPOX_CONNECTED))
1058 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1060 ifr.ifr_mtu = session->mtu;
1061 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
1064 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mtu=%d\n",
1065 session->name, session->mtu);
1071 if (!(sk->sk_state & PPPOX_CONNECTED))
1075 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1078 session->mtu = ifr.ifr_mtu;
1080 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mtu=%d\n",
1081 session->name, session->mtu);
1087 if (!(sk->sk_state & PPPOX_CONNECTED))
1091 if (put_user(session->mru, (int __user *) arg))
1094 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get mru=%d\n",
1095 session->name, session->mru);
1101 if (!(sk->sk_state & PPPOX_CONNECTED))
1105 if (get_user(val, (int __user *) arg))
1109 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set mru=%d\n",
1110 session->name, session->mru);
1116 if (put_user(ps->flags, (int __user *) arg))
1119 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get flags=%d\n",
1120 session->name, ps->flags);
1126 if (get_user(val, (int __user *) arg))
1129 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set flags=%d\n",
1130 session->name, ps->flags);
1134 case PPPIOCGL2TPSTATS:
1136 if (!(sk->sk_state & PPPOX_CONNECTED))
1139 memset(&stats, 0, sizeof(stats));
1140 stats.tunnel_id = tunnel->tunnel_id;
1141 stats.session_id = session->session_id;
1142 pppol2tp_copy_stats(&stats, &session->stats);
1143 if (copy_to_user((void __user *) arg, &stats,
1146 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1161 /* Tunnel ioctl helper.
1163 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1164 * specifies a session_id, the session ioctl handler is called. This allows an
1165 * application to retrieve session stats via a tunnel socket.
1167 static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
1168 unsigned int cmd, unsigned long arg)
1172 struct pppol2tp_ioc_stats stats;
1174 l2tp_dbg(tunnel, L2TP_MSG_CONTROL,
1175 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n",
1176 tunnel->name, cmd, arg);
1182 case PPPIOCGL2TPSTATS:
1184 if (!(sk->sk_state & PPPOX_CONNECTED))
1187 if (copy_from_user(&stats, (void __user *) arg,
1192 if (stats.session_id != 0) {
1193 /* resend to session ioctl handler */
1194 struct l2tp_session *session =
1195 l2tp_session_get(sock_net(sk), tunnel,
1196 stats.session_id, true);
1199 err = pppol2tp_session_ioctl(session, cmd,
1202 session->deref(session);
1203 l2tp_session_dec_refcount(session);
1210 stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
1212 pppol2tp_copy_stats(&stats, &tunnel->stats);
1213 if (copy_to_user((void __user *) arg, &stats, sizeof(stats))) {
1217 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get L2TP stats\n",
1232 /* Main ioctl() handler.
1233 * Dispatch to tunnel or session helpers depending on the socket.
1235 static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
1238 struct sock *sk = sock->sk;
1239 struct l2tp_session *session;
1240 struct l2tp_tunnel *tunnel;
1241 struct pppol2tp_session *ps;
1248 if (sock_flag(sk, SOCK_DEAD) != 0)
1252 if ((sk->sk_user_data == NULL) ||
1253 (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
1256 /* Get session context from the socket */
1258 session = pppol2tp_sock_to_session(sk);
1259 if (session == NULL)
1262 /* Special case: if session's session_id is zero, treat ioctl as a
1265 ps = l2tp_session_priv(session);
1266 if ((session->session_id == 0) &&
1267 (session->peer_session_id == 0)) {
1269 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1273 err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
1274 sock_put(ps->tunnel_sock);
1278 err = pppol2tp_session_ioctl(session, cmd, arg);
1286 /*****************************************************************************
1287 * setsockopt() / getsockopt() support.
1289 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1290 * sockets. In order to control kernel tunnel features, we allow userspace to
1291 * create a special "tunnel" PPPoX socket which is used for control only.
1292 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1293 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1294 *****************************************************************************/
1296 /* Tunnel setsockopt() helper.
1298 static int pppol2tp_tunnel_setsockopt(struct sock *sk,
1299 struct l2tp_tunnel *tunnel,
1300 int optname, int val)
1305 case PPPOL2TP_SO_DEBUG:
1306 tunnel->debug = val;
1307 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: set debug=%x\n",
1308 tunnel->name, tunnel->debug);
1319 /* Session setsockopt helper.
1321 static int pppol2tp_session_setsockopt(struct sock *sk,
1322 struct l2tp_session *session,
1323 int optname, int val)
1328 case PPPOL2TP_SO_RECVSEQ:
1329 if ((val != 0) && (val != 1)) {
1333 session->recv_seq = !!val;
1334 l2tp_info(session, L2TP_MSG_CONTROL,
1335 "%s: set recv_seq=%d\n",
1336 session->name, session->recv_seq);
1339 case PPPOL2TP_SO_SENDSEQ:
1340 if ((val != 0) && (val != 1)) {
1344 session->send_seq = !!val;
1346 struct pppox_sock *po = pppox_sk(sk);
1348 po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
1349 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1351 l2tp_session_set_header_len(session, session->tunnel->version);
1352 l2tp_info(session, L2TP_MSG_CONTROL,
1353 "%s: set send_seq=%d\n",
1354 session->name, session->send_seq);
1357 case PPPOL2TP_SO_LNSMODE:
1358 if ((val != 0) && (val != 1)) {
1362 session->lns_mode = !!val;
1363 l2tp_info(session, L2TP_MSG_CONTROL,
1364 "%s: set lns_mode=%d\n",
1365 session->name, session->lns_mode);
1368 case PPPOL2TP_SO_DEBUG:
1369 session->debug = val;
1370 l2tp_info(session, L2TP_MSG_CONTROL, "%s: set debug=%x\n",
1371 session->name, session->debug);
1374 case PPPOL2TP_SO_REORDERTO:
1375 session->reorder_timeout = msecs_to_jiffies(val);
1376 l2tp_info(session, L2TP_MSG_CONTROL,
1377 "%s: set reorder_timeout=%d\n",
1378 session->name, session->reorder_timeout);
1389 /* Main setsockopt() entry point.
1390 * Does API checks, then calls either the tunnel or session setsockopt
1391 * handler, according to whether the PPPoL2TP socket is a for a regular
1392 * session or the special tunnel type.
1394 static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
1395 char __user *optval, unsigned int optlen)
1397 struct sock *sk = sock->sk;
1398 struct l2tp_session *session;
1399 struct l2tp_tunnel *tunnel;
1400 struct pppol2tp_session *ps;
1404 if (level != SOL_PPPOL2TP)
1407 if (optlen < sizeof(int))
1410 if (get_user(val, (int __user *)optval))
1414 if (sk->sk_user_data == NULL)
1417 /* Get session context from the socket */
1419 session = pppol2tp_sock_to_session(sk);
1420 if (session == NULL)
1423 /* Special case: if session_id == 0x0000, treat as operation on tunnel
1425 ps = l2tp_session_priv(session);
1426 if ((session->session_id == 0) &&
1427 (session->peer_session_id == 0)) {
1429 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1433 err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
1434 sock_put(ps->tunnel_sock);
1436 err = pppol2tp_session_setsockopt(sk, session, optname, val);
1444 /* Tunnel getsockopt helper. Called with sock locked.
1446 static int pppol2tp_tunnel_getsockopt(struct sock *sk,
1447 struct l2tp_tunnel *tunnel,
1448 int optname, int *val)
1453 case PPPOL2TP_SO_DEBUG:
1454 *val = tunnel->debug;
1455 l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get debug=%x\n",
1456 tunnel->name, tunnel->debug);
1467 /* Session getsockopt helper. Called with sock locked.
1469 static int pppol2tp_session_getsockopt(struct sock *sk,
1470 struct l2tp_session *session,
1471 int optname, int *val)
1476 case PPPOL2TP_SO_RECVSEQ:
1477 *val = session->recv_seq;
1478 l2tp_info(session, L2TP_MSG_CONTROL,
1479 "%s: get recv_seq=%d\n", session->name, *val);
1482 case PPPOL2TP_SO_SENDSEQ:
1483 *val = session->send_seq;
1484 l2tp_info(session, L2TP_MSG_CONTROL,
1485 "%s: get send_seq=%d\n", session->name, *val);
1488 case PPPOL2TP_SO_LNSMODE:
1489 *val = session->lns_mode;
1490 l2tp_info(session, L2TP_MSG_CONTROL,
1491 "%s: get lns_mode=%d\n", session->name, *val);
1494 case PPPOL2TP_SO_DEBUG:
1495 *val = session->debug;
1496 l2tp_info(session, L2TP_MSG_CONTROL, "%s: get debug=%d\n",
1497 session->name, *val);
1500 case PPPOL2TP_SO_REORDERTO:
1501 *val = (int) jiffies_to_msecs(session->reorder_timeout);
1502 l2tp_info(session, L2TP_MSG_CONTROL,
1503 "%s: get reorder_timeout=%d\n", session->name, *val);
1513 /* Main getsockopt() entry point.
1514 * Does API checks, then calls either the tunnel or session getsockopt
1515 * handler, according to whether the PPPoX socket is a for a regular session
1516 * or the special tunnel type.
1518 static int pppol2tp_getsockopt(struct socket *sock, int level, int optname,
1519 char __user *optval, int __user *optlen)
1521 struct sock *sk = sock->sk;
1522 struct l2tp_session *session;
1523 struct l2tp_tunnel *tunnel;
1526 struct pppol2tp_session *ps;
1528 if (level != SOL_PPPOL2TP)
1531 if (get_user(len, optlen))
1534 len = min_t(unsigned int, len, sizeof(int));
1540 if (sk->sk_user_data == NULL)
1543 /* Get the session context */
1545 session = pppol2tp_sock_to_session(sk);
1546 if (session == NULL)
1549 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
1550 ps = l2tp_session_priv(session);
1551 if ((session->session_id == 0) &&
1552 (session->peer_session_id == 0)) {
1554 tunnel = l2tp_sock_to_tunnel(ps->tunnel_sock);
1558 err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
1559 sock_put(ps->tunnel_sock);
1563 err = pppol2tp_session_getsockopt(sk, session, optname, &val);
1569 if (put_user(len, optlen))
1572 if (copy_to_user((void __user *) optval, &val, len))
1583 /*****************************************************************************
1584 * /proc filesystem for debug
1585 * Since the original pppol2tp driver provided /proc/net/pppol2tp for
1586 * L2TPv2, we dump only L2TPv2 tunnels and sessions here.
1587 *****************************************************************************/
1589 static unsigned int pppol2tp_net_id;
1591 #ifdef CONFIG_PROC_FS
1593 struct pppol2tp_seq_data {
1594 struct seq_net_private p;
1595 int tunnel_idx; /* current tunnel */
1596 int session_idx; /* index of session within current tunnel */
1597 struct l2tp_tunnel *tunnel;
1598 struct l2tp_session *session; /* NULL means get next tunnel */
1601 static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
1604 pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx);
1607 if (pd->tunnel == NULL)
1610 /* Ignore L2TPv3 tunnels */
1611 if (pd->tunnel->version < 3)
1616 static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd)
1618 pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx, true);
1621 if (pd->session == NULL) {
1622 pd->session_idx = 0;
1623 pppol2tp_next_tunnel(net, pd);
1627 static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
1629 struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
1636 BUG_ON(m->private == NULL);
1638 net = seq_file_net(m);
1640 if (pd->tunnel == NULL)
1641 pppol2tp_next_tunnel(net, pd);
1643 pppol2tp_next_session(net, pd);
1645 /* NULL tunnel and session indicates end of list */
1646 if ((pd->tunnel == NULL) && (pd->session == NULL))
1653 static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
1659 static void pppol2tp_seq_stop(struct seq_file *p, void *v)
1664 static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
1666 struct l2tp_tunnel *tunnel = v;
1668 seq_printf(m, "\nTUNNEL '%s', %c %d\n",
1670 (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N',
1671 refcount_read(&tunnel->ref_count) - 1);
1672 seq_printf(m, " %08x %ld/%ld/%ld %ld/%ld/%ld\n",
1674 atomic_long_read(&tunnel->stats.tx_packets),
1675 atomic_long_read(&tunnel->stats.tx_bytes),
1676 atomic_long_read(&tunnel->stats.tx_errors),
1677 atomic_long_read(&tunnel->stats.rx_packets),
1678 atomic_long_read(&tunnel->stats.rx_bytes),
1679 atomic_long_read(&tunnel->stats.rx_errors));
1682 static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
1684 struct l2tp_session *session = v;
1685 struct l2tp_tunnel *tunnel = session->tunnel;
1686 unsigned char state;
1693 struct inet_sock *inet = inet_sk(tunnel->sock);
1694 ip = ntohl(inet->inet_saddr);
1695 port = ntohs(inet->inet_sport);
1698 sk = pppol2tp_session_get_sock(session);
1700 state = sk->sk_state;
1701 user_data_ok = (session == sk->sk_user_data) ? 'Y' : 'N';
1707 seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
1708 "%04X/%04X %d %c\n",
1709 session->name, ip, port,
1711 session->session_id,
1712 tunnel->peer_tunnel_id,
1713 session->peer_session_id,
1714 state, user_data_ok);
1715 seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n",
1716 session->mtu, session->mru,
1717 session->recv_seq ? 'R' : '-',
1718 session->send_seq ? 'S' : '-',
1719 session->lns_mode ? "LNS" : "LAC",
1721 jiffies_to_msecs(session->reorder_timeout));
1722 seq_printf(m, " %hu/%hu %ld/%ld/%ld %ld/%ld/%ld\n",
1723 session->nr, session->ns,
1724 atomic_long_read(&session->stats.tx_packets),
1725 atomic_long_read(&session->stats.tx_bytes),
1726 atomic_long_read(&session->stats.tx_errors),
1727 atomic_long_read(&session->stats.rx_packets),
1728 atomic_long_read(&session->stats.rx_bytes),
1729 atomic_long_read(&session->stats.rx_errors));
1732 struct pppox_sock *po = pppox_sk(sk);
1734 seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan));
1739 static int pppol2tp_seq_show(struct seq_file *m, void *v)
1741 struct pppol2tp_seq_data *pd = v;
1743 /* display header on line 1 */
1744 if (v == SEQ_START_TOKEN) {
1745 seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
1746 seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
1747 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1748 seq_puts(m, " SESSION name, addr/port src-tid/sid "
1749 "dest-tid/sid state user-data-ok\n");
1750 seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
1751 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
1755 /* Show the tunnel or session context.
1758 pppol2tp_seq_tunnel_show(m, pd->tunnel);
1760 pppol2tp_seq_session_show(m, pd->session);
1761 if (pd->session->deref)
1762 pd->session->deref(pd->session);
1763 l2tp_session_dec_refcount(pd->session);
1770 static const struct seq_operations pppol2tp_seq_ops = {
1771 .start = pppol2tp_seq_start,
1772 .next = pppol2tp_seq_next,
1773 .stop = pppol2tp_seq_stop,
1774 .show = pppol2tp_seq_show,
1777 /* Called when our /proc file is opened. We allocate data for use when
1778 * iterating our tunnel / session contexts and store it in the private
1779 * data of the seq_file.
1781 static int pppol2tp_proc_open(struct inode *inode, struct file *file)
1783 return seq_open_net(inode, file, &pppol2tp_seq_ops,
1784 sizeof(struct pppol2tp_seq_data));
1787 static const struct file_operations pppol2tp_proc_fops = {
1788 .owner = THIS_MODULE,
1789 .open = pppol2tp_proc_open,
1791 .llseek = seq_lseek,
1792 .release = seq_release_net,
1795 #endif /* CONFIG_PROC_FS */
1797 /*****************************************************************************
1799 *****************************************************************************/
1801 static __net_init int pppol2tp_init_net(struct net *net)
1803 struct proc_dir_entry *pde;
1806 pde = proc_create("pppol2tp", S_IRUGO, net->proc_net,
1807 &pppol2tp_proc_fops);
1817 static __net_exit void pppol2tp_exit_net(struct net *net)
1819 remove_proc_entry("pppol2tp", net->proc_net);
1822 static struct pernet_operations pppol2tp_net_ops = {
1823 .init = pppol2tp_init_net,
1824 .exit = pppol2tp_exit_net,
1825 .id = &pppol2tp_net_id,
1828 /*****************************************************************************
1830 *****************************************************************************/
1832 static const struct proto_ops pppol2tp_ops = {
1834 .owner = THIS_MODULE,
1835 .release = pppol2tp_release,
1836 .bind = sock_no_bind,
1837 .connect = pppol2tp_connect,
1838 .socketpair = sock_no_socketpair,
1839 .accept = sock_no_accept,
1840 .getname = pppol2tp_getname,
1841 .poll = datagram_poll,
1842 .listen = sock_no_listen,
1843 .shutdown = sock_no_shutdown,
1844 .setsockopt = pppol2tp_setsockopt,
1845 .getsockopt = pppol2tp_getsockopt,
1846 .sendmsg = pppol2tp_sendmsg,
1847 .recvmsg = pppol2tp_recvmsg,
1848 .mmap = sock_no_mmap,
1849 .ioctl = pppox_ioctl,
1852 static const struct pppox_proto pppol2tp_proto = {
1853 .create = pppol2tp_create,
1854 .ioctl = pppol2tp_ioctl,
1855 .owner = THIS_MODULE,
1858 #ifdef CONFIG_L2TP_V3
1860 static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = {
1861 .session_create = pppol2tp_session_create,
1862 .session_delete = l2tp_session_delete,
1865 #endif /* CONFIG_L2TP_V3 */
1867 static int __init pppol2tp_init(void)
1871 err = register_pernet_device(&pppol2tp_net_ops);
1875 err = proto_register(&pppol2tp_sk_proto, 0);
1877 goto out_unregister_pppol2tp_pernet;
1879 err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
1881 goto out_unregister_pppol2tp_proto;
1883 #ifdef CONFIG_L2TP_V3
1884 err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops);
1886 goto out_unregister_pppox;
1889 pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION);
1894 #ifdef CONFIG_L2TP_V3
1895 out_unregister_pppox:
1896 unregister_pppox_proto(PX_PROTO_OL2TP);
1898 out_unregister_pppol2tp_proto:
1899 proto_unregister(&pppol2tp_sk_proto);
1900 out_unregister_pppol2tp_pernet:
1901 unregister_pernet_device(&pppol2tp_net_ops);
1905 static void __exit pppol2tp_exit(void)
1907 #ifdef CONFIG_L2TP_V3
1908 l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP);
1910 unregister_pppox_proto(PX_PROTO_OL2TP);
1911 proto_unregister(&pppol2tp_sk_proto);
1912 unregister_pernet_device(&pppol2tp_net_ops);
1915 module_init(pppol2tp_init);
1916 module_exit(pppol2tp_exit);
1918 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1919 MODULE_DESCRIPTION("PPP over L2TP over UDP");
1920 MODULE_LICENSE("GPL");
1921 MODULE_VERSION(PPPOL2TP_DRV_VERSION);
1922 MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_OL2TP);
1923 MODULE_ALIAS_L2TP_PWTYPE(7);