2 * L2TPv3 IP encapsulation support for IPv6
4 * Copyright (c) 2012 Katalix Systems Ltd
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14 #include <linux/icmp.h>
15 #include <linux/module.h>
16 #include <linux/skbuff.h>
17 #include <linux/random.h>
18 #include <linux/socket.h>
19 #include <linux/l2tp.h>
21 #include <linux/in6.h>
26 #include <net/inet_common.h>
27 #include <net/inet_hashtables.h>
28 #include <net/inet6_hashtables.h>
29 #include <net/tcp_states.h>
30 #include <net/protocol.h>
33 #include <net/transp_v6.h>
34 #include <net/addrconf.h>
35 #include <net/ip6_route.h>
37 #include "l2tp_core.h"
39 struct l2tp_ip6_sock
{
40 /* inet_sock has to be the first member of l2tp_ip6_sock */
41 struct inet_sock inet
;
46 /* ipv6_pinfo has to be the last member of l2tp_ip6_sock, see
48 struct ipv6_pinfo inet6
;
51 static DEFINE_RWLOCK(l2tp_ip6_lock
);
52 static struct hlist_head l2tp_ip6_table
;
53 static struct hlist_head l2tp_ip6_bind_table
;
55 static inline struct l2tp_ip6_sock
*l2tp_ip6_sk(const struct sock
*sk
)
57 return (struct l2tp_ip6_sock
*)sk
;
60 static struct sock
*__l2tp_ip6_bind_lookup(struct net
*net
,
61 struct in6_addr
*laddr
,
62 int dif
, u32 tunnel_id
)
66 sk_for_each_bound(sk
, &l2tp_ip6_bind_table
) {
67 const struct in6_addr
*addr
= inet6_rcv_saddr(sk
);
68 struct l2tp_ip6_sock
*l2tp
= l2tp_ip6_sk(sk
);
73 if ((l2tp
->conn_id
== tunnel_id
) &&
74 net_eq(sock_net(sk
), net
) &&
75 !(addr
&& ipv6_addr_equal(addr
, laddr
)) &&
76 !(sk
->sk_bound_dev_if
&& sk
->sk_bound_dev_if
!= dif
))
85 static inline struct sock
*l2tp_ip6_bind_lookup(struct net
*net
,
86 struct in6_addr
*laddr
,
87 int dif
, u32 tunnel_id
)
89 struct sock
*sk
= __l2tp_ip6_bind_lookup(net
, laddr
, dif
, tunnel_id
);
96 /* When processing receive frames, there are two cases to
97 * consider. Data frames consist of a non-zero session-id and an
98 * optional cookie. Control frames consist of a regular L2TP header
99 * preceded by 32-bits of zeros.
101 * L2TPv3 Session Header Over IP
104 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
105 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
107 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
108 * | Cookie (optional, maximum 64 bits)...
109 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
111 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
113 * L2TPv3 Control Message Header Over IP
116 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
117 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
118 * | (32 bits of zeros) |
119 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
120 * |T|L|x|x|S|x|x|x|x|x|x|x| Ver | Length |
121 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
122 * | Control Connection ID |
123 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
125 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
127 * All control frames are passed to userspace.
129 static int l2tp_ip6_recv(struct sk_buff
*skb
)
134 unsigned char *ptr
, *optr
;
135 struct l2tp_session
*session
;
136 struct l2tp_tunnel
*tunnel
= NULL
;
139 /* Point to L2TP header */
140 optr
= ptr
= skb
->data
;
142 if (!pskb_may_pull(skb
, 4))
145 session_id
= ntohl(*((__be32
*) ptr
));
148 /* RFC3931: L2TP/IP packets have the first 4 bytes containing
149 * the session_id. If it is 0, the packet is a L2TP control
150 * frame and the session_id value can be discarded.
152 if (session_id
== 0) {
157 /* Ok, this is a data packet. Lookup the session. */
158 session
= l2tp_session_find(&init_net
, NULL
, session_id
);
162 tunnel
= session
->tunnel
;
166 /* Trace packet contents, if enabled */
167 if (tunnel
->debug
& L2TP_MSG_DATA
) {
168 length
= min(32u, skb
->len
);
169 if (!pskb_may_pull(skb
, length
))
172 pr_debug("%s: ip recv\n", tunnel
->name
);
173 print_hex_dump_bytes("", DUMP_PREFIX_OFFSET
, ptr
, length
);
176 l2tp_recv_common(session
, skb
, ptr
, optr
, 0, skb
->len
,
177 tunnel
->recv_payload_hook
);
181 /* Get the tunnel_id from the L2TP header */
182 if (!pskb_may_pull(skb
, 12))
185 if ((skb
->data
[0] & 0xc0) != 0xc0)
188 tunnel_id
= ntohl(*(__be32
*) &skb
->data
[4]);
189 tunnel
= l2tp_tunnel_find(&init_net
, tunnel_id
);
193 struct ipv6hdr
*iph
= ipv6_hdr(skb
);
195 read_lock_bh(&l2tp_ip6_lock
);
196 sk
= __l2tp_ip6_bind_lookup(&init_net
, &iph
->daddr
,
198 read_unlock_bh(&l2tp_ip6_lock
);
206 if (!xfrm6_policy_check(sk
, XFRM_POLICY_IN
, skb
))
211 return sk_receive_skb(sk
, skb
, 1);
221 static int l2tp_ip6_open(struct sock
*sk
)
223 /* Prevent autobind. We don't have ports. */
224 inet_sk(sk
)->inet_num
= IPPROTO_L2TP
;
226 write_lock_bh(&l2tp_ip6_lock
);
227 sk_add_node(sk
, &l2tp_ip6_table
);
228 write_unlock_bh(&l2tp_ip6_lock
);
233 static void l2tp_ip6_close(struct sock
*sk
, long timeout
)
235 write_lock_bh(&l2tp_ip6_lock
);
236 hlist_del_init(&sk
->sk_bind_node
);
237 sk_del_node_init(sk
);
238 write_unlock_bh(&l2tp_ip6_lock
);
240 sk_common_release(sk
);
243 static void l2tp_ip6_destroy_sock(struct sock
*sk
)
245 struct l2tp_tunnel
*tunnel
= l2tp_sock_to_tunnel(sk
);
248 ip6_flush_pending_frames(sk
);
252 l2tp_tunnel_closeall(tunnel
);
256 inet6_destroy_sock(sk
);
259 static int l2tp_ip6_bind(struct sock
*sk
, struct sockaddr
*uaddr
, int addr_len
)
261 struct inet_sock
*inet
= inet_sk(sk
);
262 struct ipv6_pinfo
*np
= inet6_sk(sk
);
263 struct sockaddr_l2tpip6
*addr
= (struct sockaddr_l2tpip6
*) uaddr
;
268 if (!sock_flag(sk
, SOCK_ZAPPED
))
270 if (addr
->l2tp_family
!= AF_INET6
)
272 if (addr_len
< sizeof(*addr
))
275 addr_type
= ipv6_addr_type(&addr
->l2tp_addr
);
277 /* l2tp_ip6 sockets are IPv6 only */
278 if (addr_type
== IPV6_ADDR_MAPPED
)
279 return -EADDRNOTAVAIL
;
281 /* L2TP is point-point, not multicast */
282 if (addr_type
& IPV6_ADDR_MULTICAST
)
283 return -EADDRNOTAVAIL
;
286 read_lock_bh(&l2tp_ip6_lock
);
287 if (__l2tp_ip6_bind_lookup(&init_net
, &addr
->l2tp_addr
,
288 sk
->sk_bound_dev_if
, addr
->l2tp_conn_id
))
290 read_unlock_bh(&l2tp_ip6_lock
);
295 if (sk
->sk_state
!= TCP_CLOSE
)
298 /* Check if the address belongs to the host. */
300 if (addr_type
!= IPV6_ADDR_ANY
) {
301 struct net_device
*dev
= NULL
;
303 if (addr_type
& IPV6_ADDR_LINKLOCAL
) {
304 if (addr_len
>= sizeof(struct sockaddr_in6
) &&
305 addr
->l2tp_scope_id
) {
306 /* Override any existing binding, if another
307 * one is supplied by user.
309 sk
->sk_bound_dev_if
= addr
->l2tp_scope_id
;
312 /* Binding to link-local address requires an
314 if (!sk
->sk_bound_dev_if
)
318 dev
= dev_get_by_index_rcu(sock_net(sk
),
319 sk
->sk_bound_dev_if
);
324 /* ipv4 addr of the socket is invalid. Only the
325 * unspecified and mapped address have a v4 equivalent.
327 v4addr
= LOOPBACK4_IPV6
;
328 err
= -EADDRNOTAVAIL
;
329 if (!ipv6_chk_addr(sock_net(sk
), &addr
->l2tp_addr
, dev
, 0))
334 inet
->inet_rcv_saddr
= inet
->inet_saddr
= v4addr
;
335 sk
->sk_v6_rcv_saddr
= addr
->l2tp_addr
;
336 np
->saddr
= addr
->l2tp_addr
;
338 l2tp_ip6_sk(sk
)->conn_id
= addr
->l2tp_conn_id
;
340 write_lock_bh(&l2tp_ip6_lock
);
341 sk_add_bind_node(sk
, &l2tp_ip6_bind_table
);
342 sk_del_node_init(sk
);
343 write_unlock_bh(&l2tp_ip6_lock
);
345 sock_reset_flag(sk
, SOCK_ZAPPED
);
356 read_unlock_bh(&l2tp_ip6_lock
);
360 static int l2tp_ip6_connect(struct sock
*sk
, struct sockaddr
*uaddr
,
363 struct sockaddr_l2tpip6
*lsa
= (struct sockaddr_l2tpip6
*) uaddr
;
364 struct sockaddr_in6
*usin
= (struct sockaddr_in6
*) uaddr
;
365 struct in6_addr
*daddr
;
369 if (sock_flag(sk
, SOCK_ZAPPED
)) /* Must bind first - autobinding does not work */
372 if (addr_len
< sizeof(*lsa
))
375 if (usin
->sin6_family
!= AF_INET6
)
378 addr_type
= ipv6_addr_type(&usin
->sin6_addr
);
379 if (addr_type
& IPV6_ADDR_MULTICAST
)
382 if (addr_type
& IPV6_ADDR_MAPPED
) {
383 daddr
= &usin
->sin6_addr
;
384 if (ipv4_is_multicast(daddr
->s6_addr32
[3]))
388 rc
= ip6_datagram_connect(sk
, uaddr
, addr_len
);
392 l2tp_ip6_sk(sk
)->peer_conn_id
= lsa
->l2tp_conn_id
;
394 write_lock_bh(&l2tp_ip6_lock
);
395 hlist_del_init(&sk
->sk_bind_node
);
396 sk_add_bind_node(sk
, &l2tp_ip6_bind_table
);
397 write_unlock_bh(&l2tp_ip6_lock
);
404 static int l2tp_ip6_disconnect(struct sock
*sk
, int flags
)
406 if (sock_flag(sk
, SOCK_ZAPPED
))
409 return udp_disconnect(sk
, flags
);
412 static int l2tp_ip6_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
413 int *uaddr_len
, int peer
)
415 struct sockaddr_l2tpip6
*lsa
= (struct sockaddr_l2tpip6
*)uaddr
;
416 struct sock
*sk
= sock
->sk
;
417 struct ipv6_pinfo
*np
= inet6_sk(sk
);
418 struct l2tp_ip6_sock
*lsk
= l2tp_ip6_sk(sk
);
420 lsa
->l2tp_family
= AF_INET6
;
421 lsa
->l2tp_flowinfo
= 0;
422 lsa
->l2tp_scope_id
= 0;
423 lsa
->l2tp_unused
= 0;
425 if (!lsk
->peer_conn_id
)
427 lsa
->l2tp_conn_id
= lsk
->peer_conn_id
;
428 lsa
->l2tp_addr
= sk
->sk_v6_daddr
;
430 lsa
->l2tp_flowinfo
= np
->flow_label
;
432 if (ipv6_addr_any(&sk
->sk_v6_rcv_saddr
))
433 lsa
->l2tp_addr
= np
->saddr
;
435 lsa
->l2tp_addr
= sk
->sk_v6_rcv_saddr
;
437 lsa
->l2tp_conn_id
= lsk
->conn_id
;
439 if (ipv6_addr_type(&lsa
->l2tp_addr
) & IPV6_ADDR_LINKLOCAL
)
440 lsa
->l2tp_scope_id
= sk
->sk_bound_dev_if
;
441 *uaddr_len
= sizeof(*lsa
);
445 static int l2tp_ip6_backlog_recv(struct sock
*sk
, struct sk_buff
*skb
)
449 /* Charge it to the socket, dropping if the queue is full. */
450 rc
= sock_queue_rcv_skb(sk
, skb
);
457 IP_INC_STATS(&init_net
, IPSTATS_MIB_INDISCARDS
);
462 static int l2tp_ip6_push_pending_frames(struct sock
*sk
)
465 __be32
*transhdr
= NULL
;
468 skb
= skb_peek(&sk
->sk_write_queue
);
472 transhdr
= (__be32
*)skb_transport_header(skb
);
475 err
= ip6_push_pending_frames(sk
);
481 /* Userspace will call sendmsg() on the tunnel socket to send L2TP
484 static int l2tp_ip6_sendmsg(struct sock
*sk
, struct msghdr
*msg
, size_t len
)
486 struct ipv6_txoptions opt_space
;
487 DECLARE_SOCKADDR(struct sockaddr_l2tpip6
*, lsa
, msg
->msg_name
);
488 struct in6_addr
*daddr
, *final_p
, final
;
489 struct ipv6_pinfo
*np
= inet6_sk(sk
);
490 struct ipv6_txoptions
*opt_to_free
= NULL
;
491 struct ipv6_txoptions
*opt
= NULL
;
492 struct ip6_flowlabel
*flowlabel
= NULL
;
493 struct dst_entry
*dst
= NULL
;
495 int addr_len
= msg
->msg_namelen
;
499 int transhdrlen
= 4; /* zero session-id */
500 int ulen
= len
+ transhdrlen
;
503 /* Rough check on arithmetic overflow,
504 better check is made in ip6_append_data().
509 /* Mirror BSD error message compatibility */
510 if (msg
->msg_flags
& MSG_OOB
)
514 * Get and verify the address.
516 memset(&fl6
, 0, sizeof(fl6
));
518 fl6
.flowi6_mark
= sk
->sk_mark
;
521 if (addr_len
< SIN6_LEN_RFC2133
)
524 if (lsa
->l2tp_family
&& lsa
->l2tp_family
!= AF_INET6
)
525 return -EAFNOSUPPORT
;
527 daddr
= &lsa
->l2tp_addr
;
529 fl6
.flowlabel
= lsa
->l2tp_flowinfo
& IPV6_FLOWINFO_MASK
;
530 if (fl6
.flowlabel
&IPV6_FLOWLABEL_MASK
) {
531 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
532 if (flowlabel
== NULL
)
538 * Otherwise it will be difficult to maintain
541 if (sk
->sk_state
== TCP_ESTABLISHED
&&
542 ipv6_addr_equal(daddr
, &sk
->sk_v6_daddr
))
543 daddr
= &sk
->sk_v6_daddr
;
545 if (addr_len
>= sizeof(struct sockaddr_in6
) &&
546 lsa
->l2tp_scope_id
&&
547 ipv6_addr_type(daddr
) & IPV6_ADDR_LINKLOCAL
)
548 fl6
.flowi6_oif
= lsa
->l2tp_scope_id
;
550 if (sk
->sk_state
!= TCP_ESTABLISHED
)
551 return -EDESTADDRREQ
;
553 daddr
= &sk
->sk_v6_daddr
;
554 fl6
.flowlabel
= np
->flow_label
;
557 if (fl6
.flowi6_oif
== 0)
558 fl6
.flowi6_oif
= sk
->sk_bound_dev_if
;
560 if (msg
->msg_controllen
) {
562 memset(opt
, 0, sizeof(struct ipv6_txoptions
));
563 opt
->tot_len
= sizeof(struct ipv6_txoptions
);
565 err
= ip6_datagram_send_ctl(sock_net(sk
), sk
, msg
, &fl6
, opt
,
566 &hlimit
, &tclass
, &dontfrag
);
568 fl6_sock_release(flowlabel
);
571 if ((fl6
.flowlabel
& IPV6_FLOWLABEL_MASK
) && !flowlabel
) {
572 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
573 if (flowlabel
== NULL
)
576 if (!(opt
->opt_nflen
|opt
->opt_flen
))
585 opt
= fl6_merge_options(&opt_space
, flowlabel
, opt
);
586 opt
= ipv6_fixup_options(&opt_space
, opt
);
588 fl6
.flowi6_proto
= sk
->sk_protocol
;
589 if (!ipv6_addr_any(daddr
))
592 fl6
.daddr
.s6_addr
[15] = 0x1; /* :: means loopback (BSD'ism) */
593 if (ipv6_addr_any(&fl6
.saddr
) && !ipv6_addr_any(&np
->saddr
))
594 fl6
.saddr
= np
->saddr
;
596 final_p
= fl6_update_dst(&fl6
, opt
, &final
);
598 if (!fl6
.flowi6_oif
&& ipv6_addr_is_multicast(&fl6
.daddr
))
599 fl6
.flowi6_oif
= np
->mcast_oif
;
600 else if (!fl6
.flowi6_oif
)
601 fl6
.flowi6_oif
= np
->ucast_oif
;
603 security_sk_classify_flow(sk
, flowi6_to_flowi(&fl6
));
605 dst
= ip6_dst_lookup_flow(sk
, &fl6
, final_p
);
612 hlimit
= ip6_sk_dst_hoplimit(np
, &fl6
, dst
);
618 dontfrag
= np
->dontfrag
;
620 if (msg
->msg_flags
& MSG_CONFIRM
)
625 err
= ip6_append_data(sk
, ip_generic_getfrag
, msg
,
626 ulen
, transhdrlen
, hlimit
, tclass
, opt
,
627 &fl6
, (struct rt6_info
*)dst
,
628 msg
->msg_flags
, dontfrag
);
630 ip6_flush_pending_frames(sk
);
631 else if (!(msg
->msg_flags
& MSG_MORE
))
632 err
= l2tp_ip6_push_pending_frames(sk
);
637 fl6_sock_release(flowlabel
);
638 txopt_put(opt_to_free
);
640 return err
< 0 ? err
: len
;
644 if (!(msg
->msg_flags
& MSG_PROBE
) || len
)
645 goto back_from_confirm
;
650 static int l2tp_ip6_recvmsg(struct sock
*sk
, struct msghdr
*msg
, size_t len
,
651 int noblock
, int flags
, int *addr_len
)
653 struct ipv6_pinfo
*np
= inet6_sk(sk
);
654 DECLARE_SOCKADDR(struct sockaddr_l2tpip6
*, lsa
, msg
->msg_name
);
656 int err
= -EOPNOTSUPP
;
663 *addr_len
= sizeof(*lsa
);
665 if (flags
& MSG_ERRQUEUE
)
666 return ipv6_recv_error(sk
, msg
, len
, addr_len
);
668 skb
= skb_recv_datagram(sk
, flags
, noblock
, &err
);
674 msg
->msg_flags
|= MSG_TRUNC
;
678 err
= skb_copy_datagram_msg(skb
, 0, msg
, copied
);
682 sock_recv_timestamp(msg
, sk
, skb
);
684 /* Copy the address. */
686 lsa
->l2tp_family
= AF_INET6
;
687 lsa
->l2tp_unused
= 0;
688 lsa
->l2tp_addr
= ipv6_hdr(skb
)->saddr
;
689 lsa
->l2tp_flowinfo
= 0;
690 lsa
->l2tp_scope_id
= 0;
691 lsa
->l2tp_conn_id
= 0;
692 if (ipv6_addr_type(&lsa
->l2tp_addr
) & IPV6_ADDR_LINKLOCAL
)
693 lsa
->l2tp_scope_id
= inet6_iif(skb
);
697 ip6_datagram_recv_ctl(sk
, msg
, skb
);
699 if (flags
& MSG_TRUNC
)
702 skb_free_datagram(sk
, skb
);
704 return err
? err
: copied
;
707 static struct proto l2tp_ip6_prot
= {
709 .owner
= THIS_MODULE
,
710 .init
= l2tp_ip6_open
,
711 .close
= l2tp_ip6_close
,
712 .bind
= l2tp_ip6_bind
,
713 .connect
= l2tp_ip6_connect
,
714 .disconnect
= l2tp_ip6_disconnect
,
716 .destroy
= l2tp_ip6_destroy_sock
,
717 .setsockopt
= ipv6_setsockopt
,
718 .getsockopt
= ipv6_getsockopt
,
719 .sendmsg
= l2tp_ip6_sendmsg
,
720 .recvmsg
= l2tp_ip6_recvmsg
,
721 .backlog_rcv
= l2tp_ip6_backlog_recv
,
723 .unhash
= inet_unhash
,
724 .obj_size
= sizeof(struct l2tp_ip6_sock
),
726 .compat_setsockopt
= compat_ipv6_setsockopt
,
727 .compat_getsockopt
= compat_ipv6_getsockopt
,
731 static const struct proto_ops l2tp_ip6_ops
= {
733 .owner
= THIS_MODULE
,
734 .release
= inet6_release
,
736 .connect
= inet_dgram_connect
,
737 .socketpair
= sock_no_socketpair
,
738 .accept
= sock_no_accept
,
739 .getname
= l2tp_ip6_getname
,
740 .poll
= datagram_poll
,
741 .ioctl
= inet6_ioctl
,
742 .listen
= sock_no_listen
,
743 .shutdown
= inet_shutdown
,
744 .setsockopt
= sock_common_setsockopt
,
745 .getsockopt
= sock_common_getsockopt
,
746 .sendmsg
= inet_sendmsg
,
747 .recvmsg
= sock_common_recvmsg
,
748 .mmap
= sock_no_mmap
,
749 .sendpage
= sock_no_sendpage
,
751 .compat_setsockopt
= compat_sock_common_setsockopt
,
752 .compat_getsockopt
= compat_sock_common_getsockopt
,
756 static struct inet_protosw l2tp_ip6_protosw
= {
758 .protocol
= IPPROTO_L2TP
,
759 .prot
= &l2tp_ip6_prot
,
760 .ops
= &l2tp_ip6_ops
,
763 static struct inet6_protocol l2tp_ip6_protocol __read_mostly
= {
764 .handler
= l2tp_ip6_recv
,
767 static int __init
l2tp_ip6_init(void)
771 pr_info("L2TP IP encapsulation support for IPv6 (L2TPv3)\n");
773 err
= proto_register(&l2tp_ip6_prot
, 1);
777 err
= inet6_add_protocol(&l2tp_ip6_protocol
, IPPROTO_L2TP
);
781 inet6_register_protosw(&l2tp_ip6_protosw
);
785 proto_unregister(&l2tp_ip6_prot
);
790 static void __exit
l2tp_ip6_exit(void)
792 inet6_unregister_protosw(&l2tp_ip6_protosw
);
793 inet6_del_protocol(&l2tp_ip6_protocol
, IPPROTO_L2TP
);
794 proto_unregister(&l2tp_ip6_prot
);
797 module_init(l2tp_ip6_init
);
798 module_exit(l2tp_ip6_exit
);
800 MODULE_LICENSE("GPL");
801 MODULE_AUTHOR("Chris Elston <celston@katalix.com>");
802 MODULE_DESCRIPTION("L2TP IP encapsulation for IPv6");
803 MODULE_VERSION("1.0");
805 /* Use the value of SOCK_DGRAM (2) directory, because __stringify doesn't like
808 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6
, 2, IPPROTO_L2TP
);
809 MODULE_ALIAS_NET_PF_PROTO(PF_INET6
, IPPROTO_L2TP
);