1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* L2TPv3 IP encapsulation support for IPv6
4 * Copyright (c) 2012 Katalix Systems Ltd
7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9 #include <linux/icmp.h>
10 #include <linux/module.h>
11 #include <linux/skbuff.h>
12 #include <linux/random.h>
13 #include <linux/socket.h>
14 #include <linux/l2tp.h>
16 #include <linux/in6.h>
21 #include <net/inet_common.h>
22 #include <net/tcp_states.h>
23 #include <net/protocol.h>
26 #include <net/transp_v6.h>
27 #include <net/addrconf.h>
28 #include <net/ip6_route.h>
30 #include "l2tp_core.h"
32 struct l2tp_ip6_sock
{
33 /* inet_sock has to be the first member of l2tp_ip6_sock */
34 struct inet_sock inet
;
39 struct ipv6_pinfo inet6
;
42 static DEFINE_RWLOCK(l2tp_ip6_lock
);
43 static struct hlist_head l2tp_ip6_table
;
44 static struct hlist_head l2tp_ip6_bind_table
;
46 static inline struct l2tp_ip6_sock
*l2tp_ip6_sk(const struct sock
*sk
)
48 return (struct l2tp_ip6_sock
*)sk
;
51 static struct sock
*__l2tp_ip6_bind_lookup(const struct net
*net
,
52 const struct in6_addr
*laddr
,
53 const struct in6_addr
*raddr
,
54 int dif
, u32 tunnel_id
)
58 sk_for_each_bound(sk
, &l2tp_ip6_bind_table
) {
59 const struct in6_addr
*sk_laddr
= inet6_rcv_saddr(sk
);
60 const struct in6_addr
*sk_raddr
= &sk
->sk_v6_daddr
;
61 const struct l2tp_ip6_sock
*l2tp
= l2tp_ip6_sk(sk
);
64 if (!net_eq(sock_net(sk
), net
))
67 bound_dev_if
= READ_ONCE(sk
->sk_bound_dev_if
);
68 if (bound_dev_if
&& dif
&& bound_dev_if
!= dif
)
71 if (sk_laddr
&& !ipv6_addr_any(sk_laddr
) &&
72 !ipv6_addr_any(laddr
) && !ipv6_addr_equal(sk_laddr
, laddr
))
75 if (!ipv6_addr_any(sk_raddr
) && raddr
&&
76 !ipv6_addr_any(raddr
) && !ipv6_addr_equal(sk_raddr
, raddr
))
79 if (l2tp
->conn_id
!= tunnel_id
)
90 /* When processing receive frames, there are two cases to
91 * consider. Data frames consist of a non-zero session-id and an
92 * optional cookie. Control frames consist of a regular L2TP header
93 * preceded by 32-bits of zeros.
95 * L2TPv3 Session Header Over IP
98 * 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
99 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
101 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
102 * | Cookie (optional, maximum 64 bits)...
103 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
105 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
107 * L2TPv3 Control Message Header Over IP
110 * 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
111 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
112 * | (32 bits of zeros) |
113 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
114 * |T|L|x|x|S|x|x|x|x|x|x|x| Ver | Length |
115 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
116 * | Control Connection ID |
117 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
119 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
121 * All control frames are passed to userspace.
123 static int l2tp_ip6_recv(struct sk_buff
*skb
)
125 struct net
*net
= dev_net(skb
->dev
);
129 unsigned char *ptr
, *optr
;
130 struct l2tp_session
*session
;
131 struct l2tp_tunnel
*tunnel
= NULL
;
134 if (!pskb_may_pull(skb
, 4))
137 /* Point to L2TP header */
140 session_id
= ntohl(*((__be32
*)ptr
));
143 /* RFC3931: L2TP/IP packets have the first 4 bytes containing
144 * the session_id. If it is 0, the packet is a L2TP control
145 * frame and the session_id value can be discarded.
147 if (session_id
== 0) {
152 /* Ok, this is a data packet. Lookup the session. */
153 session
= l2tp_session_get(net
, session_id
);
157 tunnel
= session
->tunnel
;
161 if (l2tp_v3_ensure_opt_in_linear(session
, skb
, &ptr
, &optr
))
164 l2tp_recv_common(session
, skb
, ptr
, optr
, 0, skb
->len
);
165 l2tp_session_dec_refcount(session
);
170 /* Get the tunnel_id from the L2TP header */
171 if (!pskb_may_pull(skb
, 12))
174 if ((skb
->data
[0] & 0xc0) != 0xc0)
177 tunnel_id
= ntohl(*(__be32
*)&skb
->data
[4]);
180 read_lock_bh(&l2tp_ip6_lock
);
181 sk
= __l2tp_ip6_bind_lookup(net
, &iph
->daddr
, &iph
->saddr
,
182 inet6_iif(skb
), tunnel_id
);
184 read_unlock_bh(&l2tp_ip6_lock
);
188 read_unlock_bh(&l2tp_ip6_lock
);
190 if (!xfrm6_policy_check(sk
, XFRM_POLICY_IN
, skb
))
195 return sk_receive_skb(sk
, skb
, 1);
198 l2tp_session_dec_refcount(session
);
209 static int l2tp_ip6_hash(struct sock
*sk
)
211 if (sk_unhashed(sk
)) {
212 write_lock_bh(&l2tp_ip6_lock
);
213 sk_add_node(sk
, &l2tp_ip6_table
);
214 write_unlock_bh(&l2tp_ip6_lock
);
219 static void l2tp_ip6_unhash(struct sock
*sk
)
223 write_lock_bh(&l2tp_ip6_lock
);
224 sk_del_node_init(sk
);
225 write_unlock_bh(&l2tp_ip6_lock
);
228 static int l2tp_ip6_open(struct sock
*sk
)
230 /* Prevent autobind. We don't have ports. */
231 inet_sk(sk
)->inet_num
= IPPROTO_L2TP
;
237 static void l2tp_ip6_close(struct sock
*sk
, long timeout
)
239 write_lock_bh(&l2tp_ip6_lock
);
240 hlist_del_init(&sk
->sk_bind_node
);
241 sk_del_node_init(sk
);
242 write_unlock_bh(&l2tp_ip6_lock
);
244 sk_common_release(sk
);
247 static void l2tp_ip6_destroy_sock(struct sock
*sk
)
249 struct l2tp_tunnel
*tunnel
= l2tp_sk_to_tunnel(sk
);
252 ip6_flush_pending_frames(sk
);
256 l2tp_tunnel_delete(tunnel
);
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
;
264 struct net
*net
= sock_net(sk
);
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
;
288 if (!sock_flag(sk
, SOCK_ZAPPED
))
291 if (sk
->sk_state
!= TCP_CLOSE
)
294 bound_dev_if
= sk
->sk_bound_dev_if
;
296 /* Check if the address belongs to the host. */
298 if (addr_type
!= IPV6_ADDR_ANY
) {
299 struct net_device
*dev
= NULL
;
301 if (addr_type
& IPV6_ADDR_LINKLOCAL
) {
302 if (addr
->l2tp_scope_id
)
303 bound_dev_if
= addr
->l2tp_scope_id
;
305 /* Binding to link-local address requires an
312 dev
= dev_get_by_index_rcu(sock_net(sk
), bound_dev_if
);
317 /* ipv4 addr of the socket is invalid. Only the
318 * unspecified and mapped address have a v4 equivalent.
320 v4addr
= LOOPBACK4_IPV6
;
321 err
= -EADDRNOTAVAIL
;
322 if (!ipv6_chk_addr(sock_net(sk
), &addr
->l2tp_addr
, dev
, 0))
327 write_lock_bh(&l2tp_ip6_lock
);
328 if (__l2tp_ip6_bind_lookup(net
, &addr
->l2tp_addr
, NULL
, bound_dev_if
,
329 addr
->l2tp_conn_id
)) {
330 write_unlock_bh(&l2tp_ip6_lock
);
335 inet
->inet_saddr
= v4addr
;
336 inet
->inet_rcv_saddr
= v4addr
;
337 sk
->sk_bound_dev_if
= bound_dev_if
;
338 sk
->sk_v6_rcv_saddr
= addr
->l2tp_addr
;
339 np
->saddr
= addr
->l2tp_addr
;
341 l2tp_ip6_sk(sk
)->conn_id
= addr
->l2tp_conn_id
;
343 sk_add_bind_node(sk
, &l2tp_ip6_bind_table
);
344 sk_del_node_init(sk
);
345 write_unlock_bh(&l2tp_ip6_lock
);
347 sock_reset_flag(sk
, SOCK_ZAPPED
);
359 static int l2tp_ip6_connect(struct sock
*sk
, struct sockaddr
*uaddr
,
362 struct sockaddr_l2tpip6
*lsa
= (struct sockaddr_l2tpip6
*)uaddr
;
363 struct sockaddr_in6
*usin
= (struct sockaddr_in6
*)uaddr
;
364 struct in6_addr
*daddr
;
368 if (addr_len
< sizeof(*lsa
))
371 if (usin
->sin6_family
!= AF_INET6
)
374 addr_type
= ipv6_addr_type(&usin
->sin6_addr
);
375 if (addr_type
& IPV6_ADDR_MULTICAST
)
378 if (addr_type
& IPV6_ADDR_MAPPED
) {
379 daddr
= &usin
->sin6_addr
;
380 if (ipv4_is_multicast(daddr
->s6_addr32
[3]))
386 /* Must bind first - autobinding does not work */
387 if (sock_flag(sk
, SOCK_ZAPPED
)) {
392 rc
= __ip6_datagram_connect(sk
, uaddr
, addr_len
);
396 l2tp_ip6_sk(sk
)->peer_conn_id
= lsa
->l2tp_conn_id
;
398 write_lock_bh(&l2tp_ip6_lock
);
399 hlist_del_init(&sk
->sk_bind_node
);
400 sk_add_bind_node(sk
, &l2tp_ip6_bind_table
);
401 write_unlock_bh(&l2tp_ip6_lock
);
409 static int l2tp_ip6_disconnect(struct sock
*sk
, int flags
)
411 if (sock_flag(sk
, SOCK_ZAPPED
))
414 return __udp_disconnect(sk
, flags
);
417 static int l2tp_ip6_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
420 struct sockaddr_l2tpip6
*lsa
= (struct sockaddr_l2tpip6
*)uaddr
;
421 struct sock
*sk
= sock
->sk
;
422 struct ipv6_pinfo
*np
= inet6_sk(sk
);
423 struct l2tp_ip6_sock
*lsk
= l2tp_ip6_sk(sk
);
425 lsa
->l2tp_family
= AF_INET6
;
426 lsa
->l2tp_flowinfo
= 0;
427 lsa
->l2tp_scope_id
= 0;
428 lsa
->l2tp_unused
= 0;
430 if (!lsk
->peer_conn_id
)
432 lsa
->l2tp_conn_id
= lsk
->peer_conn_id
;
433 lsa
->l2tp_addr
= sk
->sk_v6_daddr
;
435 lsa
->l2tp_flowinfo
= np
->flow_label
;
437 if (ipv6_addr_any(&sk
->sk_v6_rcv_saddr
))
438 lsa
->l2tp_addr
= np
->saddr
;
440 lsa
->l2tp_addr
= sk
->sk_v6_rcv_saddr
;
442 lsa
->l2tp_conn_id
= lsk
->conn_id
;
444 if (ipv6_addr_type(&lsa
->l2tp_addr
) & IPV6_ADDR_LINKLOCAL
)
445 lsa
->l2tp_scope_id
= READ_ONCE(sk
->sk_bound_dev_if
);
449 static int l2tp_ip6_backlog_recv(struct sock
*sk
, struct sk_buff
*skb
)
453 /* Charge it to the socket, dropping if the queue is full. */
454 rc
= sock_queue_rcv_skb(sk
, skb
);
461 IP_INC_STATS(sock_net(sk
), IPSTATS_MIB_INDISCARDS
);
466 static int l2tp_ip6_push_pending_frames(struct sock
*sk
)
469 __be32
*transhdr
= NULL
;
472 skb
= skb_peek(&sk
->sk_write_queue
);
476 transhdr
= (__be32
*)skb_transport_header(skb
);
479 err
= ip6_push_pending_frames(sk
);
485 /* Userspace will call sendmsg() on the tunnel socket to send L2TP
488 static int l2tp_ip6_sendmsg(struct sock
*sk
, struct msghdr
*msg
, size_t len
)
490 struct ipv6_txoptions opt_space
;
491 DECLARE_SOCKADDR(struct sockaddr_l2tpip6
*, lsa
, msg
->msg_name
);
492 struct in6_addr
*daddr
, *final_p
, final
;
493 struct ipv6_pinfo
*np
= inet6_sk(sk
);
494 struct ipv6_txoptions
*opt_to_free
= NULL
;
495 struct ipv6_txoptions
*opt
= NULL
;
496 struct ip6_flowlabel
*flowlabel
= NULL
;
497 struct dst_entry
*dst
= NULL
;
499 struct ipcm6_cookie ipc6
;
500 int addr_len
= msg
->msg_namelen
;
501 int transhdrlen
= 4; /* zero session-id */
505 /* Rough check on arithmetic overflow,
506 * better check is made in ip6_append_data().
508 if (len
> INT_MAX
- transhdrlen
)
511 /* Mirror BSD error message compatibility */
512 if (msg
->msg_flags
& MSG_OOB
)
515 /* Get and verify the address */
516 memset(&fl6
, 0, sizeof(fl6
));
518 fl6
.flowi6_mark
= READ_ONCE(sk
->sk_mark
);
519 fl6
.flowi6_uid
= sk
->sk_uid
;
524 if (addr_len
< SIN6_LEN_RFC2133
)
527 if (lsa
->l2tp_family
&& lsa
->l2tp_family
!= AF_INET6
)
528 return -EAFNOSUPPORT
;
530 daddr
= &lsa
->l2tp_addr
;
532 fl6
.flowlabel
= lsa
->l2tp_flowinfo
& IPV6_FLOWINFO_MASK
;
533 if (fl6
.flowlabel
& IPV6_FLOWLABEL_MASK
) {
534 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
535 if (IS_ERR(flowlabel
))
540 /* Otherwise it will be difficult to maintain
543 if (sk
->sk_state
== TCP_ESTABLISHED
&&
544 ipv6_addr_equal(daddr
, &sk
->sk_v6_daddr
))
545 daddr
= &sk
->sk_v6_daddr
;
547 if (addr_len
>= sizeof(struct sockaddr_in6
) &&
548 lsa
->l2tp_scope_id
&&
549 ipv6_addr_type(daddr
) & IPV6_ADDR_LINKLOCAL
)
550 fl6
.flowi6_oif
= lsa
->l2tp_scope_id
;
552 if (sk
->sk_state
!= TCP_ESTABLISHED
)
553 return -EDESTADDRREQ
;
555 daddr
= &sk
->sk_v6_daddr
;
556 fl6
.flowlabel
= np
->flow_label
;
559 if (fl6
.flowi6_oif
== 0)
560 fl6
.flowi6_oif
= READ_ONCE(sk
->sk_bound_dev_if
);
562 if (msg
->msg_controllen
) {
564 memset(opt
, 0, sizeof(struct ipv6_txoptions
));
565 opt
->tot_len
= sizeof(struct ipv6_txoptions
);
568 err
= ip6_datagram_send_ctl(sock_net(sk
), sk
, msg
, &fl6
, &ipc6
);
570 fl6_sock_release(flowlabel
);
573 if ((fl6
.flowlabel
& IPV6_FLOWLABEL_MASK
) && !flowlabel
) {
574 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
575 if (IS_ERR(flowlabel
))
578 if (!(opt
->opt_nflen
| opt
->opt_flen
))
587 opt
= fl6_merge_options(&opt_space
, flowlabel
, opt
);
588 opt
= ipv6_fixup_options(&opt_space
, opt
);
591 fl6
.flowi6_proto
= sk
->sk_protocol
;
592 if (!ipv6_addr_any(daddr
))
595 fl6
.daddr
.s6_addr
[15] = 0x1; /* :: means loopback (BSD'ism) */
596 if (ipv6_addr_any(&fl6
.saddr
) && !ipv6_addr_any(&np
->saddr
))
597 fl6
.saddr
= np
->saddr
;
599 final_p
= fl6_update_dst(&fl6
, opt
, &final
);
601 if (!fl6
.flowi6_oif
&& ipv6_addr_is_multicast(&fl6
.daddr
))
602 fl6
.flowi6_oif
= np
->mcast_oif
;
603 else if (!fl6
.flowi6_oif
)
604 fl6
.flowi6_oif
= np
->ucast_oif
;
606 security_sk_classify_flow(sk
, flowi6_to_flowi_common(&fl6
));
609 ipc6
.tclass
= np
->tclass
;
611 fl6
.flowlabel
= ip6_make_flowinfo(ipc6
.tclass
, fl6
.flowlabel
);
613 dst
= ip6_dst_lookup_flow(sock_net(sk
), sk
, &fl6
, final_p
);
620 ipc6
.hlimit
= ip6_sk_dst_hoplimit(np
, &fl6
, dst
);
622 if (ipc6
.dontfrag
< 0)
623 ipc6
.dontfrag
= np
->dontfrag
;
625 if (msg
->msg_flags
& MSG_CONFIRM
)
630 ulen
= len
+ skb_queue_empty(&sk
->sk_write_queue
) ? transhdrlen
: 0;
631 err
= ip6_append_data(sk
, ip_generic_getfrag
, msg
,
632 ulen
, transhdrlen
, &ipc6
,
633 &fl6
, (struct rt6_info
*)dst
,
636 ip6_flush_pending_frames(sk
);
637 else if (!(msg
->msg_flags
& MSG_MORE
))
638 err
= l2tp_ip6_push_pending_frames(sk
);
643 fl6_sock_release(flowlabel
);
644 txopt_put(opt_to_free
);
646 return err
< 0 ? err
: len
;
649 if (msg
->msg_flags
& MSG_PROBE
)
650 dst_confirm_neigh(dst
, &fl6
.daddr
);
651 if (!(msg
->msg_flags
& MSG_PROBE
) || len
)
652 goto back_from_confirm
;
657 static int l2tp_ip6_recvmsg(struct sock
*sk
, struct msghdr
*msg
, size_t len
,
658 int flags
, int *addr_len
)
660 struct ipv6_pinfo
*np
= inet6_sk(sk
);
661 DECLARE_SOCKADDR(struct sockaddr_l2tpip6
*, lsa
, msg
->msg_name
);
663 int err
= -EOPNOTSUPP
;
669 if (flags
& MSG_ERRQUEUE
)
670 return ipv6_recv_error(sk
, msg
, len
, addr_len
);
672 skb
= skb_recv_datagram(sk
, flags
, &err
);
678 msg
->msg_flags
|= MSG_TRUNC
;
682 err
= skb_copy_datagram_msg(skb
, 0, msg
, copied
);
686 sock_recv_timestamp(msg
, sk
, skb
);
688 /* Copy the address. */
690 lsa
->l2tp_family
= AF_INET6
;
691 lsa
->l2tp_unused
= 0;
692 lsa
->l2tp_addr
= ipv6_hdr(skb
)->saddr
;
693 lsa
->l2tp_flowinfo
= 0;
694 lsa
->l2tp_scope_id
= 0;
695 lsa
->l2tp_conn_id
= 0;
696 if (ipv6_addr_type(&lsa
->l2tp_addr
) & IPV6_ADDR_LINKLOCAL
)
697 lsa
->l2tp_scope_id
= inet6_iif(skb
);
698 *addr_len
= sizeof(*lsa
);
702 ip6_datagram_recv_ctl(sk
, msg
, skb
);
704 if (flags
& MSG_TRUNC
)
707 skb_free_datagram(sk
, skb
);
709 return err
? err
: copied
;
712 static struct proto l2tp_ip6_prot
= {
714 .owner
= THIS_MODULE
,
715 .init
= l2tp_ip6_open
,
716 .close
= l2tp_ip6_close
,
717 .bind
= l2tp_ip6_bind
,
718 .connect
= l2tp_ip6_connect
,
719 .disconnect
= l2tp_ip6_disconnect
,
721 .destroy
= l2tp_ip6_destroy_sock
,
722 .setsockopt
= ipv6_setsockopt
,
723 .getsockopt
= ipv6_getsockopt
,
724 .sendmsg
= l2tp_ip6_sendmsg
,
725 .recvmsg
= l2tp_ip6_recvmsg
,
726 .backlog_rcv
= l2tp_ip6_backlog_recv
,
727 .hash
= l2tp_ip6_hash
,
728 .unhash
= l2tp_ip6_unhash
,
729 .obj_size
= sizeof(struct l2tp_ip6_sock
),
730 .ipv6_pinfo_offset
= offsetof(struct l2tp_ip6_sock
, inet6
),
733 static const struct proto_ops l2tp_ip6_ops
= {
735 .owner
= THIS_MODULE
,
736 .release
= inet6_release
,
738 .connect
= inet_dgram_connect
,
739 .socketpair
= sock_no_socketpair
,
740 .accept
= sock_no_accept
,
741 .getname
= l2tp_ip6_getname
,
742 .poll
= datagram_poll
,
743 .ioctl
= inet6_ioctl
,
744 .gettstamp
= sock_gettstamp
,
745 .listen
= sock_no_listen
,
746 .shutdown
= inet_shutdown
,
747 .setsockopt
= sock_common_setsockopt
,
748 .getsockopt
= sock_common_getsockopt
,
749 .sendmsg
= inet_sendmsg
,
750 .recvmsg
= sock_common_recvmsg
,
751 .mmap
= sock_no_mmap
,
753 .compat_ioctl
= inet6_compat_ioctl
,
757 static struct inet_protosw l2tp_ip6_protosw
= {
759 .protocol
= IPPROTO_L2TP
,
760 .prot
= &l2tp_ip6_prot
,
761 .ops
= &l2tp_ip6_ops
,
764 static struct inet6_protocol l2tp_ip6_protocol __read_mostly
= {
765 .handler
= l2tp_ip6_recv
,
768 static int __init
l2tp_ip6_init(void)
772 pr_info("L2TP IP encapsulation support for IPv6 (L2TPv3)\n");
774 err
= proto_register(&l2tp_ip6_prot
, 1);
778 err
= inet6_add_protocol(&l2tp_ip6_protocol
, IPPROTO_L2TP
);
782 inet6_register_protosw(&l2tp_ip6_protosw
);
786 proto_unregister(&l2tp_ip6_prot
);
791 static void __exit
l2tp_ip6_exit(void)
793 inet6_unregister_protosw(&l2tp_ip6_protosw
);
794 inet6_del_protocol(&l2tp_ip6_protocol
, IPPROTO_L2TP
);
795 proto_unregister(&l2tp_ip6_prot
);
798 module_init(l2tp_ip6_init
);
799 module_exit(l2tp_ip6_exit
);
801 MODULE_LICENSE("GPL");
802 MODULE_AUTHOR("Chris Elston <celston@katalix.com>");
803 MODULE_DESCRIPTION("L2TP IP encapsulation for IPv6");
804 MODULE_VERSION("1.0");
806 /* Use the values of SOCK_DGRAM (2) as type and IPPROTO_L2TP (115) as protocol,
807 * because __stringify doesn't like enums
809 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6
, 115, 2);
810 MODULE_ALIAS_NET_PF_PROTO(PF_INET6
, 115);