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(const struct net
*net
,
61 const struct in6_addr
*laddr
,
62 const struct in6_addr
*raddr
,
63 int dif
, u32 tunnel_id
)
67 sk_for_each_bound(sk
, &l2tp_ip6_bind_table
) {
68 const struct in6_addr
*sk_laddr
= inet6_rcv_saddr(sk
);
69 const struct in6_addr
*sk_raddr
= &sk
->sk_v6_daddr
;
70 const struct l2tp_ip6_sock
*l2tp
= l2tp_ip6_sk(sk
);
72 if (!net_eq(sock_net(sk
), net
))
75 if (sk
->sk_bound_dev_if
&& dif
&& sk
->sk_bound_dev_if
!= dif
)
78 if (sk_laddr
&& !ipv6_addr_any(sk_laddr
) &&
79 !ipv6_addr_any(laddr
) && !ipv6_addr_equal(sk_laddr
, laddr
))
82 if (!ipv6_addr_any(sk_raddr
) && raddr
&&
83 !ipv6_addr_any(raddr
) && !ipv6_addr_equal(sk_raddr
, raddr
))
86 if (l2tp
->conn_id
!= tunnel_id
)
97 /* When processing receive frames, there are two cases to
98 * consider. Data frames consist of a non-zero session-id and an
99 * optional cookie. Control frames consist of a regular L2TP header
100 * preceded by 32-bits of zeros.
102 * L2TPv3 Session Header Over IP
105 * 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
106 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
108 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
109 * | Cookie (optional, maximum 64 bits)...
110 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
112 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
114 * L2TPv3 Control Message Header Over IP
117 * 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
118 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
119 * | (32 bits of zeros) |
120 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
121 * |T|L|x|x|S|x|x|x|x|x|x|x| Ver | Length |
122 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
123 * | Control Connection ID |
124 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
126 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
128 * All control frames are passed to userspace.
130 static int l2tp_ip6_recv(struct sk_buff
*skb
)
132 struct net
*net
= dev_net(skb
->dev
);
136 unsigned char *ptr
, *optr
;
137 struct l2tp_session
*session
;
138 struct l2tp_tunnel
*tunnel
= NULL
;
142 if (!pskb_may_pull(skb
, 4))
145 /* Point to L2TP header */
146 optr
= ptr
= skb
->data
;
147 session_id
= ntohl(*((__be32
*) ptr
));
150 /* RFC3931: L2TP/IP packets have the first 4 bytes containing
151 * the session_id. If it is 0, the packet is a L2TP control
152 * frame and the session_id value can be discarded.
154 if (session_id
== 0) {
159 /* Ok, this is a data packet. Lookup the session. */
160 session
= l2tp_session_get(net
, NULL
, session_id
);
164 tunnel
= session
->tunnel
;
168 /* Trace packet contents, if enabled */
169 if (tunnel
->debug
& L2TP_MSG_DATA
) {
170 length
= min(32u, skb
->len
);
171 if (!pskb_may_pull(skb
, length
))
174 /* Point to L2TP header */
175 optr
= ptr
= skb
->data
;
177 pr_debug("%s: ip recv\n", tunnel
->name
);
178 print_hex_dump_bytes("", DUMP_PREFIX_OFFSET
, ptr
, length
);
181 if (l2tp_v3_ensure_opt_in_linear(session
, skb
, &ptr
, &optr
))
184 l2tp_recv_common(session
, skb
, ptr
, optr
, 0, skb
->len
,
185 tunnel
->recv_payload_hook
);
186 l2tp_session_dec_refcount(session
);
191 /* Get the tunnel_id from the L2TP header */
192 if (!pskb_may_pull(skb
, 12))
195 if ((skb
->data
[0] & 0xc0) != 0xc0)
198 tunnel_id
= ntohl(*(__be32
*) &skb
->data
[4]);
201 read_lock_bh(&l2tp_ip6_lock
);
202 sk
= __l2tp_ip6_bind_lookup(net
, &iph
->daddr
, &iph
->saddr
,
203 inet6_iif(skb
), tunnel_id
);
205 read_unlock_bh(&l2tp_ip6_lock
);
209 read_unlock_bh(&l2tp_ip6_lock
);
211 if (!xfrm6_policy_check(sk
, XFRM_POLICY_IN
, skb
))
216 return sk_receive_skb(sk
, skb
, 1);
219 l2tp_session_dec_refcount(session
);
230 static int l2tp_ip6_open(struct sock
*sk
)
232 /* Prevent autobind. We don't have ports. */
233 inet_sk(sk
)->inet_num
= IPPROTO_L2TP
;
235 write_lock_bh(&l2tp_ip6_lock
);
236 sk_add_node(sk
, &l2tp_ip6_table
);
237 write_unlock_bh(&l2tp_ip6_lock
);
242 static void l2tp_ip6_close(struct sock
*sk
, long timeout
)
244 write_lock_bh(&l2tp_ip6_lock
);
245 hlist_del_init(&sk
->sk_bind_node
);
246 sk_del_node_init(sk
);
247 write_unlock_bh(&l2tp_ip6_lock
);
249 sk_common_release(sk
);
252 static void l2tp_ip6_destroy_sock(struct sock
*sk
)
254 struct l2tp_tunnel
*tunnel
= sk
->sk_user_data
;
257 ip6_flush_pending_frames(sk
);
261 l2tp_tunnel_delete(tunnel
);
263 inet6_destroy_sock(sk
);
266 static int l2tp_ip6_bind(struct sock
*sk
, struct sockaddr
*uaddr
, int addr_len
)
268 struct inet_sock
*inet
= inet_sk(sk
);
269 struct ipv6_pinfo
*np
= inet6_sk(sk
);
270 struct sockaddr_l2tpip6
*addr
= (struct sockaddr_l2tpip6
*) uaddr
;
271 struct net
*net
= sock_net(sk
);
277 if (addr
->l2tp_family
!= AF_INET6
)
279 if (addr_len
< sizeof(*addr
))
282 addr_type
= ipv6_addr_type(&addr
->l2tp_addr
);
284 /* l2tp_ip6 sockets are IPv6 only */
285 if (addr_type
== IPV6_ADDR_MAPPED
)
286 return -EADDRNOTAVAIL
;
288 /* L2TP is point-point, not multicast */
289 if (addr_type
& IPV6_ADDR_MULTICAST
)
290 return -EADDRNOTAVAIL
;
295 if (!sock_flag(sk
, SOCK_ZAPPED
))
298 if (sk
->sk_state
!= TCP_CLOSE
)
301 bound_dev_if
= sk
->sk_bound_dev_if
;
303 /* Check if the address belongs to the host. */
305 if (addr_type
!= IPV6_ADDR_ANY
) {
306 struct net_device
*dev
= NULL
;
308 if (addr_type
& IPV6_ADDR_LINKLOCAL
) {
309 if (addr
->l2tp_scope_id
)
310 bound_dev_if
= addr
->l2tp_scope_id
;
312 /* Binding to link-local address requires an
319 dev
= dev_get_by_index_rcu(sock_net(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 write_lock_bh(&l2tp_ip6_lock
);
335 if (__l2tp_ip6_bind_lookup(net
, &addr
->l2tp_addr
, NULL
, bound_dev_if
,
336 addr
->l2tp_conn_id
)) {
337 write_unlock_bh(&l2tp_ip6_lock
);
342 inet
->inet_saddr
= v4addr
;
343 inet
->inet_rcv_saddr
= v4addr
;
344 sk
->sk_bound_dev_if
= bound_dev_if
;
345 sk
->sk_v6_rcv_saddr
= addr
->l2tp_addr
;
346 np
->saddr
= addr
->l2tp_addr
;
348 l2tp_ip6_sk(sk
)->conn_id
= addr
->l2tp_conn_id
;
350 sk_add_bind_node(sk
, &l2tp_ip6_bind_table
);
351 sk_del_node_init(sk
);
352 write_unlock_bh(&l2tp_ip6_lock
);
354 sock_reset_flag(sk
, SOCK_ZAPPED
);
366 static int l2tp_ip6_connect(struct sock
*sk
, struct sockaddr
*uaddr
,
369 struct sockaddr_l2tpip6
*lsa
= (struct sockaddr_l2tpip6
*) uaddr
;
370 struct sockaddr_in6
*usin
= (struct sockaddr_in6
*) uaddr
;
371 struct in6_addr
*daddr
;
375 if (addr_len
< sizeof(*lsa
))
378 if (usin
->sin6_family
!= AF_INET6
)
381 addr_type
= ipv6_addr_type(&usin
->sin6_addr
);
382 if (addr_type
& IPV6_ADDR_MULTICAST
)
385 if (addr_type
& IPV6_ADDR_MAPPED
) {
386 daddr
= &usin
->sin6_addr
;
387 if (ipv4_is_multicast(daddr
->s6_addr32
[3]))
393 /* Must bind first - autobinding does not work */
394 if (sock_flag(sk
, SOCK_ZAPPED
)) {
399 rc
= __ip6_datagram_connect(sk
, uaddr
, addr_len
);
403 l2tp_ip6_sk(sk
)->peer_conn_id
= lsa
->l2tp_conn_id
;
405 write_lock_bh(&l2tp_ip6_lock
);
406 hlist_del_init(&sk
->sk_bind_node
);
407 sk_add_bind_node(sk
, &l2tp_ip6_bind_table
);
408 write_unlock_bh(&l2tp_ip6_lock
);
416 static int l2tp_ip6_disconnect(struct sock
*sk
, int flags
)
418 if (sock_flag(sk
, SOCK_ZAPPED
))
421 return __udp_disconnect(sk
, flags
);
424 static int l2tp_ip6_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
425 int *uaddr_len
, int peer
)
427 struct sockaddr_l2tpip6
*lsa
= (struct sockaddr_l2tpip6
*)uaddr
;
428 struct sock
*sk
= sock
->sk
;
429 struct ipv6_pinfo
*np
= inet6_sk(sk
);
430 struct l2tp_ip6_sock
*lsk
= l2tp_ip6_sk(sk
);
432 lsa
->l2tp_family
= AF_INET6
;
433 lsa
->l2tp_flowinfo
= 0;
434 lsa
->l2tp_scope_id
= 0;
435 lsa
->l2tp_unused
= 0;
437 if (!lsk
->peer_conn_id
)
439 lsa
->l2tp_conn_id
= lsk
->peer_conn_id
;
440 lsa
->l2tp_addr
= sk
->sk_v6_daddr
;
442 lsa
->l2tp_flowinfo
= np
->flow_label
;
444 if (ipv6_addr_any(&sk
->sk_v6_rcv_saddr
))
445 lsa
->l2tp_addr
= np
->saddr
;
447 lsa
->l2tp_addr
= sk
->sk_v6_rcv_saddr
;
449 lsa
->l2tp_conn_id
= lsk
->conn_id
;
451 if (ipv6_addr_type(&lsa
->l2tp_addr
) & IPV6_ADDR_LINKLOCAL
)
452 lsa
->l2tp_scope_id
= sk
->sk_bound_dev_if
;
453 *uaddr_len
= sizeof(*lsa
);
457 static int l2tp_ip6_backlog_recv(struct sock
*sk
, struct sk_buff
*skb
)
461 /* Charge it to the socket, dropping if the queue is full. */
462 rc
= sock_queue_rcv_skb(sk
, skb
);
469 IP_INC_STATS(sock_net(sk
), IPSTATS_MIB_INDISCARDS
);
474 static int l2tp_ip6_push_pending_frames(struct sock
*sk
)
477 __be32
*transhdr
= NULL
;
480 skb
= skb_peek(&sk
->sk_write_queue
);
484 transhdr
= (__be32
*)skb_transport_header(skb
);
487 err
= ip6_push_pending_frames(sk
);
493 /* Userspace will call sendmsg() on the tunnel socket to send L2TP
496 static int l2tp_ip6_sendmsg(struct sock
*sk
, struct msghdr
*msg
, size_t len
)
498 struct ipv6_txoptions opt_space
;
499 DECLARE_SOCKADDR(struct sockaddr_l2tpip6
*, lsa
, msg
->msg_name
);
500 struct in6_addr
*daddr
, *final_p
, final
;
501 struct ipv6_pinfo
*np
= inet6_sk(sk
);
502 struct ipv6_txoptions
*opt_to_free
= NULL
;
503 struct ipv6_txoptions
*opt
= NULL
;
504 struct ip6_flowlabel
*flowlabel
= NULL
;
505 struct dst_entry
*dst
= NULL
;
507 struct sockcm_cookie sockc_unused
= {0};
508 struct ipcm6_cookie ipc6
;
509 int addr_len
= msg
->msg_namelen
;
510 int transhdrlen
= 4; /* zero session-id */
511 int ulen
= len
+ transhdrlen
;
514 /* Rough check on arithmetic overflow,
515 better check is made in ip6_append_data().
520 /* Mirror BSD error message compatibility */
521 if (msg
->msg_flags
& MSG_OOB
)
525 * Get and verify the address.
527 memset(&fl6
, 0, sizeof(fl6
));
529 fl6
.flowi6_mark
= sk
->sk_mark
;
530 fl6
.flowi6_uid
= sk
->sk_uid
;
537 if (addr_len
< SIN6_LEN_RFC2133
)
540 if (lsa
->l2tp_family
&& lsa
->l2tp_family
!= AF_INET6
)
541 return -EAFNOSUPPORT
;
543 daddr
= &lsa
->l2tp_addr
;
545 fl6
.flowlabel
= lsa
->l2tp_flowinfo
& IPV6_FLOWINFO_MASK
;
546 if (fl6
.flowlabel
&IPV6_FLOWLABEL_MASK
) {
547 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
548 if (flowlabel
== NULL
)
554 * Otherwise it will be difficult to maintain
557 if (sk
->sk_state
== TCP_ESTABLISHED
&&
558 ipv6_addr_equal(daddr
, &sk
->sk_v6_daddr
))
559 daddr
= &sk
->sk_v6_daddr
;
561 if (addr_len
>= sizeof(struct sockaddr_in6
) &&
562 lsa
->l2tp_scope_id
&&
563 ipv6_addr_type(daddr
) & IPV6_ADDR_LINKLOCAL
)
564 fl6
.flowi6_oif
= lsa
->l2tp_scope_id
;
566 if (sk
->sk_state
!= TCP_ESTABLISHED
)
567 return -EDESTADDRREQ
;
569 daddr
= &sk
->sk_v6_daddr
;
570 fl6
.flowlabel
= np
->flow_label
;
573 if (fl6
.flowi6_oif
== 0)
574 fl6
.flowi6_oif
= sk
->sk_bound_dev_if
;
576 if (msg
->msg_controllen
) {
578 memset(opt
, 0, sizeof(struct ipv6_txoptions
));
579 opt
->tot_len
= sizeof(struct ipv6_txoptions
);
582 err
= ip6_datagram_send_ctl(sock_net(sk
), sk
, msg
, &fl6
, &ipc6
,
585 fl6_sock_release(flowlabel
);
588 if ((fl6
.flowlabel
& IPV6_FLOWLABEL_MASK
) && !flowlabel
) {
589 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
590 if (flowlabel
== NULL
)
593 if (!(opt
->opt_nflen
|opt
->opt_flen
))
602 opt
= fl6_merge_options(&opt_space
, flowlabel
, opt
);
603 opt
= ipv6_fixup_options(&opt_space
, opt
);
606 fl6
.flowi6_proto
= sk
->sk_protocol
;
607 if (!ipv6_addr_any(daddr
))
610 fl6
.daddr
.s6_addr
[15] = 0x1; /* :: means loopback (BSD'ism) */
611 if (ipv6_addr_any(&fl6
.saddr
) && !ipv6_addr_any(&np
->saddr
))
612 fl6
.saddr
= np
->saddr
;
614 final_p
= fl6_update_dst(&fl6
, opt
, &final
);
616 if (!fl6
.flowi6_oif
&& ipv6_addr_is_multicast(&fl6
.daddr
))
617 fl6
.flowi6_oif
= np
->mcast_oif
;
618 else if (!fl6
.flowi6_oif
)
619 fl6
.flowi6_oif
= np
->ucast_oif
;
621 security_sk_classify_flow(sk
, flowi6_to_flowi(&fl6
));
624 ipc6
.tclass
= np
->tclass
;
626 fl6
.flowlabel
= ip6_make_flowinfo(ipc6
.tclass
, fl6
.flowlabel
);
628 dst
= ip6_dst_lookup_flow(sk
, &fl6
, final_p
);
635 ipc6
.hlimit
= ip6_sk_dst_hoplimit(np
, &fl6
, dst
);
637 if (ipc6
.dontfrag
< 0)
638 ipc6
.dontfrag
= np
->dontfrag
;
640 if (msg
->msg_flags
& MSG_CONFIRM
)
645 err
= ip6_append_data(sk
, ip_generic_getfrag
, msg
,
646 ulen
, transhdrlen
, &ipc6
,
647 &fl6
, (struct rt6_info
*)dst
,
648 msg
->msg_flags
, &sockc_unused
);
650 ip6_flush_pending_frames(sk
);
651 else if (!(msg
->msg_flags
& MSG_MORE
))
652 err
= l2tp_ip6_push_pending_frames(sk
);
657 fl6_sock_release(flowlabel
);
658 txopt_put(opt_to_free
);
660 return err
< 0 ? err
: len
;
663 if (msg
->msg_flags
& MSG_PROBE
)
664 dst_confirm_neigh(dst
, &fl6
.daddr
);
665 if (!(msg
->msg_flags
& MSG_PROBE
) || len
)
666 goto back_from_confirm
;
671 static int l2tp_ip6_recvmsg(struct sock
*sk
, struct msghdr
*msg
, size_t len
,
672 int noblock
, int flags
, int *addr_len
)
674 struct ipv6_pinfo
*np
= inet6_sk(sk
);
675 DECLARE_SOCKADDR(struct sockaddr_l2tpip6
*, lsa
, msg
->msg_name
);
677 int err
= -EOPNOTSUPP
;
683 if (flags
& MSG_ERRQUEUE
)
684 return ipv6_recv_error(sk
, msg
, len
, addr_len
);
686 skb
= skb_recv_datagram(sk
, flags
, noblock
, &err
);
692 msg
->msg_flags
|= MSG_TRUNC
;
696 err
= skb_copy_datagram_msg(skb
, 0, msg
, copied
);
700 sock_recv_timestamp(msg
, sk
, skb
);
702 /* Copy the address. */
704 lsa
->l2tp_family
= AF_INET6
;
705 lsa
->l2tp_unused
= 0;
706 lsa
->l2tp_addr
= ipv6_hdr(skb
)->saddr
;
707 lsa
->l2tp_flowinfo
= 0;
708 lsa
->l2tp_scope_id
= 0;
709 lsa
->l2tp_conn_id
= 0;
710 if (ipv6_addr_type(&lsa
->l2tp_addr
) & IPV6_ADDR_LINKLOCAL
)
711 lsa
->l2tp_scope_id
= inet6_iif(skb
);
712 *addr_len
= sizeof(*lsa
);
716 ip6_datagram_recv_ctl(sk
, msg
, skb
);
718 if (flags
& MSG_TRUNC
)
721 skb_free_datagram(sk
, skb
);
723 return err
? err
: copied
;
726 static struct proto l2tp_ip6_prot
= {
728 .owner
= THIS_MODULE
,
729 .init
= l2tp_ip6_open
,
730 .close
= l2tp_ip6_close
,
731 .bind
= l2tp_ip6_bind
,
732 .connect
= l2tp_ip6_connect
,
733 .disconnect
= l2tp_ip6_disconnect
,
735 .destroy
= l2tp_ip6_destroy_sock
,
736 .setsockopt
= ipv6_setsockopt
,
737 .getsockopt
= ipv6_getsockopt
,
738 .sendmsg
= l2tp_ip6_sendmsg
,
739 .recvmsg
= l2tp_ip6_recvmsg
,
740 .backlog_rcv
= l2tp_ip6_backlog_recv
,
742 .unhash
= inet_unhash
,
743 .obj_size
= sizeof(struct l2tp_ip6_sock
),
745 .compat_setsockopt
= compat_ipv6_setsockopt
,
746 .compat_getsockopt
= compat_ipv6_getsockopt
,
750 static const struct proto_ops l2tp_ip6_ops
= {
752 .owner
= THIS_MODULE
,
753 .release
= inet6_release
,
755 .connect
= inet_dgram_connect
,
756 .socketpair
= sock_no_socketpair
,
757 .accept
= sock_no_accept
,
758 .getname
= l2tp_ip6_getname
,
759 .poll
= datagram_poll
,
760 .ioctl
= inet6_ioctl
,
761 .listen
= sock_no_listen
,
762 .shutdown
= inet_shutdown
,
763 .setsockopt
= sock_common_setsockopt
,
764 .getsockopt
= sock_common_getsockopt
,
765 .sendmsg
= inet_sendmsg
,
766 .recvmsg
= sock_common_recvmsg
,
767 .mmap
= sock_no_mmap
,
768 .sendpage
= sock_no_sendpage
,
770 .compat_setsockopt
= compat_sock_common_setsockopt
,
771 .compat_getsockopt
= compat_sock_common_getsockopt
,
775 static struct inet_protosw l2tp_ip6_protosw
= {
777 .protocol
= IPPROTO_L2TP
,
778 .prot
= &l2tp_ip6_prot
,
779 .ops
= &l2tp_ip6_ops
,
782 static struct inet6_protocol l2tp_ip6_protocol __read_mostly
= {
783 .handler
= l2tp_ip6_recv
,
786 static int __init
l2tp_ip6_init(void)
790 pr_info("L2TP IP encapsulation support for IPv6 (L2TPv3)\n");
792 err
= proto_register(&l2tp_ip6_prot
, 1);
796 err
= inet6_add_protocol(&l2tp_ip6_protocol
, IPPROTO_L2TP
);
800 inet6_register_protosw(&l2tp_ip6_protosw
);
804 proto_unregister(&l2tp_ip6_prot
);
809 static void __exit
l2tp_ip6_exit(void)
811 inet6_unregister_protosw(&l2tp_ip6_protosw
);
812 inet6_del_protocol(&l2tp_ip6_protocol
, IPPROTO_L2TP
);
813 proto_unregister(&l2tp_ip6_prot
);
816 module_init(l2tp_ip6_init
);
817 module_exit(l2tp_ip6_exit
);
819 MODULE_LICENSE("GPL");
820 MODULE_AUTHOR("Chris Elston <celston@katalix.com>");
821 MODULE_DESCRIPTION("L2TP IP encapsulation for IPv6");
822 MODULE_VERSION("1.0");
824 /* Use the value of SOCK_DGRAM (2) directory, because __stringify doesn't like
827 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6
, 2, IPPROTO_L2TP
);
828 MODULE_ALIAS_NET_PF_PROTO(PF_INET6
, IPPROTO_L2TP
);