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
;
141 if (!pskb_may_pull(skb
, 4))
144 /* Point to L2TP header */
145 optr
= ptr
= skb
->data
;
146 session_id
= ntohl(*((__be32
*) ptr
));
149 /* RFC3931: L2TP/IP packets have the first 4 bytes containing
150 * the session_id. If it is 0, the packet is a L2TP control
151 * frame and the session_id value can be discarded.
153 if (session_id
== 0) {
158 /* Ok, this is a data packet. Lookup the session. */
159 session
= l2tp_session_get(net
, NULL
, session_id
, true);
163 tunnel
= session
->tunnel
;
167 /* Trace packet contents, if enabled */
168 if (tunnel
->debug
& L2TP_MSG_DATA
) {
169 length
= min(32u, skb
->len
);
170 if (!pskb_may_pull(skb
, length
))
173 /* Point to L2TP header */
174 optr
= ptr
= skb
->data
;
176 pr_debug("%s: ip recv\n", tunnel
->name
);
177 print_hex_dump_bytes("", DUMP_PREFIX_OFFSET
, ptr
, length
);
180 l2tp_recv_common(session
, skb
, ptr
, optr
, 0, skb
->len
,
181 tunnel
->recv_payload_hook
);
182 l2tp_session_dec_refcount(session
);
187 /* Get the tunnel_id from the L2TP header */
188 if (!pskb_may_pull(skb
, 12))
191 if ((skb
->data
[0] & 0xc0) != 0xc0)
194 tunnel_id
= ntohl(*(__be32
*) &skb
->data
[4]);
195 tunnel
= l2tp_tunnel_find(net
, tunnel_id
);
200 struct ipv6hdr
*iph
= ipv6_hdr(skb
);
202 read_lock_bh(&l2tp_ip6_lock
);
203 sk
= __l2tp_ip6_bind_lookup(net
, &iph
->daddr
, &iph
->saddr
,
204 inet6_iif(skb
), tunnel_id
);
206 read_unlock_bh(&l2tp_ip6_lock
);
211 read_unlock_bh(&l2tp_ip6_lock
);
214 if (!xfrm6_policy_check(sk
, XFRM_POLICY_IN
, skb
))
219 return sk_receive_skb(sk
, skb
, 1);
223 session
->deref(session
);
224 l2tp_session_dec_refcount(session
);
235 static int l2tp_ip6_open(struct sock
*sk
)
237 /* Prevent autobind. We don't have ports. */
238 inet_sk(sk
)->inet_num
= IPPROTO_L2TP
;
240 write_lock_bh(&l2tp_ip6_lock
);
241 sk_add_node(sk
, &l2tp_ip6_table
);
242 write_unlock_bh(&l2tp_ip6_lock
);
247 static void l2tp_ip6_close(struct sock
*sk
, long timeout
)
249 write_lock_bh(&l2tp_ip6_lock
);
250 hlist_del_init(&sk
->sk_bind_node
);
251 sk_del_node_init(sk
);
252 write_unlock_bh(&l2tp_ip6_lock
);
254 sk_common_release(sk
);
257 static void l2tp_ip6_destroy_sock(struct sock
*sk
)
259 struct l2tp_tunnel
*tunnel
= l2tp_sock_to_tunnel(sk
);
262 ip6_flush_pending_frames(sk
);
266 l2tp_tunnel_closeall(tunnel
);
270 inet6_destroy_sock(sk
);
273 static int l2tp_ip6_bind(struct sock
*sk
, struct sockaddr
*uaddr
, int addr_len
)
275 struct inet_sock
*inet
= inet_sk(sk
);
276 struct ipv6_pinfo
*np
= inet6_sk(sk
);
277 struct sockaddr_l2tpip6
*addr
= (struct sockaddr_l2tpip6
*) uaddr
;
278 struct net
*net
= sock_net(sk
);
284 if (addr
->l2tp_family
!= AF_INET6
)
286 if (addr_len
< sizeof(*addr
))
289 addr_type
= ipv6_addr_type(&addr
->l2tp_addr
);
291 /* l2tp_ip6 sockets are IPv6 only */
292 if (addr_type
== IPV6_ADDR_MAPPED
)
293 return -EADDRNOTAVAIL
;
295 /* L2TP is point-point, not multicast */
296 if (addr_type
& IPV6_ADDR_MULTICAST
)
297 return -EADDRNOTAVAIL
;
302 if (!sock_flag(sk
, SOCK_ZAPPED
))
305 if (sk
->sk_state
!= TCP_CLOSE
)
308 bound_dev_if
= sk
->sk_bound_dev_if
;
310 /* Check if the address belongs to the host. */
312 if (addr_type
!= IPV6_ADDR_ANY
) {
313 struct net_device
*dev
= NULL
;
315 if (addr_type
& IPV6_ADDR_LINKLOCAL
) {
316 if (addr
->l2tp_scope_id
)
317 bound_dev_if
= addr
->l2tp_scope_id
;
319 /* Binding to link-local address requires an
326 dev
= dev_get_by_index_rcu(sock_net(sk
), bound_dev_if
);
331 /* ipv4 addr of the socket is invalid. Only the
332 * unspecified and mapped address have a v4 equivalent.
334 v4addr
= LOOPBACK4_IPV6
;
335 err
= -EADDRNOTAVAIL
;
336 if (!ipv6_chk_addr(sock_net(sk
), &addr
->l2tp_addr
, dev
, 0))
341 write_lock_bh(&l2tp_ip6_lock
);
342 if (__l2tp_ip6_bind_lookup(net
, &addr
->l2tp_addr
, NULL
, bound_dev_if
,
343 addr
->l2tp_conn_id
)) {
344 write_unlock_bh(&l2tp_ip6_lock
);
349 inet
->inet_saddr
= v4addr
;
350 inet
->inet_rcv_saddr
= v4addr
;
351 sk
->sk_bound_dev_if
= bound_dev_if
;
352 sk
->sk_v6_rcv_saddr
= addr
->l2tp_addr
;
353 np
->saddr
= addr
->l2tp_addr
;
355 l2tp_ip6_sk(sk
)->conn_id
= addr
->l2tp_conn_id
;
357 sk_add_bind_node(sk
, &l2tp_ip6_bind_table
);
358 sk_del_node_init(sk
);
359 write_unlock_bh(&l2tp_ip6_lock
);
361 sock_reset_flag(sk
, SOCK_ZAPPED
);
373 static int l2tp_ip6_connect(struct sock
*sk
, struct sockaddr
*uaddr
,
376 struct sockaddr_l2tpip6
*lsa
= (struct sockaddr_l2tpip6
*) uaddr
;
377 struct sockaddr_in6
*usin
= (struct sockaddr_in6
*) uaddr
;
378 struct in6_addr
*daddr
;
382 if (addr_len
< sizeof(*lsa
))
385 if (usin
->sin6_family
!= AF_INET6
)
388 addr_type
= ipv6_addr_type(&usin
->sin6_addr
);
389 if (addr_type
& IPV6_ADDR_MULTICAST
)
392 if (addr_type
& IPV6_ADDR_MAPPED
) {
393 daddr
= &usin
->sin6_addr
;
394 if (ipv4_is_multicast(daddr
->s6_addr32
[3]))
400 /* Must bind first - autobinding does not work */
401 if (sock_flag(sk
, SOCK_ZAPPED
)) {
406 rc
= __ip6_datagram_connect(sk
, uaddr
, addr_len
);
410 l2tp_ip6_sk(sk
)->peer_conn_id
= lsa
->l2tp_conn_id
;
412 write_lock_bh(&l2tp_ip6_lock
);
413 hlist_del_init(&sk
->sk_bind_node
);
414 sk_add_bind_node(sk
, &l2tp_ip6_bind_table
);
415 write_unlock_bh(&l2tp_ip6_lock
);
423 static int l2tp_ip6_disconnect(struct sock
*sk
, int flags
)
425 if (sock_flag(sk
, SOCK_ZAPPED
))
428 return __udp_disconnect(sk
, flags
);
431 static int l2tp_ip6_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
432 int *uaddr_len
, int peer
)
434 struct sockaddr_l2tpip6
*lsa
= (struct sockaddr_l2tpip6
*)uaddr
;
435 struct sock
*sk
= sock
->sk
;
436 struct ipv6_pinfo
*np
= inet6_sk(sk
);
437 struct l2tp_ip6_sock
*lsk
= l2tp_ip6_sk(sk
);
439 lsa
->l2tp_family
= AF_INET6
;
440 lsa
->l2tp_flowinfo
= 0;
441 lsa
->l2tp_scope_id
= 0;
442 lsa
->l2tp_unused
= 0;
444 if (!lsk
->peer_conn_id
)
446 lsa
->l2tp_conn_id
= lsk
->peer_conn_id
;
447 lsa
->l2tp_addr
= sk
->sk_v6_daddr
;
449 lsa
->l2tp_flowinfo
= np
->flow_label
;
451 if (ipv6_addr_any(&sk
->sk_v6_rcv_saddr
))
452 lsa
->l2tp_addr
= np
->saddr
;
454 lsa
->l2tp_addr
= sk
->sk_v6_rcv_saddr
;
456 lsa
->l2tp_conn_id
= lsk
->conn_id
;
458 if (ipv6_addr_type(&lsa
->l2tp_addr
) & IPV6_ADDR_LINKLOCAL
)
459 lsa
->l2tp_scope_id
= sk
->sk_bound_dev_if
;
460 *uaddr_len
= sizeof(*lsa
);
464 static int l2tp_ip6_backlog_recv(struct sock
*sk
, struct sk_buff
*skb
)
468 /* Charge it to the socket, dropping if the queue is full. */
469 rc
= sock_queue_rcv_skb(sk
, skb
);
476 IP_INC_STATS(sock_net(sk
), IPSTATS_MIB_INDISCARDS
);
481 static int l2tp_ip6_push_pending_frames(struct sock
*sk
)
484 __be32
*transhdr
= NULL
;
487 skb
= skb_peek(&sk
->sk_write_queue
);
491 transhdr
= (__be32
*)skb_transport_header(skb
);
494 err
= ip6_push_pending_frames(sk
);
500 /* Userspace will call sendmsg() on the tunnel socket to send L2TP
503 static int l2tp_ip6_sendmsg(struct sock
*sk
, struct msghdr
*msg
, size_t len
)
505 struct ipv6_txoptions opt_space
;
506 DECLARE_SOCKADDR(struct sockaddr_l2tpip6
*, lsa
, msg
->msg_name
);
507 struct in6_addr
*daddr
, *final_p
, final
;
508 struct ipv6_pinfo
*np
= inet6_sk(sk
);
509 struct ipv6_txoptions
*opt_to_free
= NULL
;
510 struct ipv6_txoptions
*opt
= NULL
;
511 struct ip6_flowlabel
*flowlabel
= NULL
;
512 struct dst_entry
*dst
= NULL
;
514 struct sockcm_cookie sockc_unused
= {0};
515 struct ipcm6_cookie ipc6
;
516 int addr_len
= msg
->msg_namelen
;
517 int transhdrlen
= 4; /* zero session-id */
518 int ulen
= len
+ transhdrlen
;
521 /* Rough check on arithmetic overflow,
522 better check is made in ip6_append_data().
527 /* Mirror BSD error message compatibility */
528 if (msg
->msg_flags
& MSG_OOB
)
532 * Get and verify the address.
534 memset(&fl6
, 0, sizeof(fl6
));
536 fl6
.flowi6_mark
= sk
->sk_mark
;
537 fl6
.flowi6_uid
= sk
->sk_uid
;
544 if (addr_len
< SIN6_LEN_RFC2133
)
547 if (lsa
->l2tp_family
&& lsa
->l2tp_family
!= AF_INET6
)
548 return -EAFNOSUPPORT
;
550 daddr
= &lsa
->l2tp_addr
;
552 fl6
.flowlabel
= lsa
->l2tp_flowinfo
& IPV6_FLOWINFO_MASK
;
553 if (fl6
.flowlabel
&IPV6_FLOWLABEL_MASK
) {
554 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
555 if (flowlabel
== NULL
)
561 * Otherwise it will be difficult to maintain
564 if (sk
->sk_state
== TCP_ESTABLISHED
&&
565 ipv6_addr_equal(daddr
, &sk
->sk_v6_daddr
))
566 daddr
= &sk
->sk_v6_daddr
;
568 if (addr_len
>= sizeof(struct sockaddr_in6
) &&
569 lsa
->l2tp_scope_id
&&
570 ipv6_addr_type(daddr
) & IPV6_ADDR_LINKLOCAL
)
571 fl6
.flowi6_oif
= lsa
->l2tp_scope_id
;
573 if (sk
->sk_state
!= TCP_ESTABLISHED
)
574 return -EDESTADDRREQ
;
576 daddr
= &sk
->sk_v6_daddr
;
577 fl6
.flowlabel
= np
->flow_label
;
580 if (fl6
.flowi6_oif
== 0)
581 fl6
.flowi6_oif
= sk
->sk_bound_dev_if
;
583 if (msg
->msg_controllen
) {
585 memset(opt
, 0, sizeof(struct ipv6_txoptions
));
586 opt
->tot_len
= sizeof(struct ipv6_txoptions
);
589 err
= ip6_datagram_send_ctl(sock_net(sk
), sk
, msg
, &fl6
, &ipc6
,
592 fl6_sock_release(flowlabel
);
595 if ((fl6
.flowlabel
& IPV6_FLOWLABEL_MASK
) && !flowlabel
) {
596 flowlabel
= fl6_sock_lookup(sk
, fl6
.flowlabel
);
597 if (flowlabel
== NULL
)
600 if (!(opt
->opt_nflen
|opt
->opt_flen
))
609 opt
= fl6_merge_options(&opt_space
, flowlabel
, opt
);
610 opt
= ipv6_fixup_options(&opt_space
, opt
);
613 fl6
.flowi6_proto
= sk
->sk_protocol
;
614 if (!ipv6_addr_any(daddr
))
617 fl6
.daddr
.s6_addr
[15] = 0x1; /* :: means loopback (BSD'ism) */
618 if (ipv6_addr_any(&fl6
.saddr
) && !ipv6_addr_any(&np
->saddr
))
619 fl6
.saddr
= np
->saddr
;
621 final_p
= fl6_update_dst(&fl6
, opt
, &final
);
623 if (!fl6
.flowi6_oif
&& ipv6_addr_is_multicast(&fl6
.daddr
))
624 fl6
.flowi6_oif
= np
->mcast_oif
;
625 else if (!fl6
.flowi6_oif
)
626 fl6
.flowi6_oif
= np
->ucast_oif
;
628 security_sk_classify_flow(sk
, flowi6_to_flowi(&fl6
));
631 ipc6
.tclass
= np
->tclass
;
633 fl6
.flowlabel
= ip6_make_flowinfo(ipc6
.tclass
, fl6
.flowlabel
);
635 dst
= ip6_dst_lookup_flow(sk
, &fl6
, final_p
);
642 ipc6
.hlimit
= ip6_sk_dst_hoplimit(np
, &fl6
, dst
);
644 if (ipc6
.dontfrag
< 0)
645 ipc6
.dontfrag
= np
->dontfrag
;
647 if (msg
->msg_flags
& MSG_CONFIRM
)
652 err
= ip6_append_data(sk
, ip_generic_getfrag
, msg
,
653 ulen
, transhdrlen
, &ipc6
,
654 &fl6
, (struct rt6_info
*)dst
,
655 msg
->msg_flags
, &sockc_unused
);
657 ip6_flush_pending_frames(sk
);
658 else if (!(msg
->msg_flags
& MSG_MORE
))
659 err
= l2tp_ip6_push_pending_frames(sk
);
664 fl6_sock_release(flowlabel
);
665 txopt_put(opt_to_free
);
667 return err
< 0 ? err
: len
;
670 if (msg
->msg_flags
& MSG_PROBE
)
671 dst_confirm_neigh(dst
, &fl6
.daddr
);
672 if (!(msg
->msg_flags
& MSG_PROBE
) || len
)
673 goto back_from_confirm
;
678 static int l2tp_ip6_recvmsg(struct sock
*sk
, struct msghdr
*msg
, size_t len
,
679 int noblock
, int flags
, int *addr_len
)
681 struct ipv6_pinfo
*np
= inet6_sk(sk
);
682 DECLARE_SOCKADDR(struct sockaddr_l2tpip6
*, lsa
, msg
->msg_name
);
684 int err
= -EOPNOTSUPP
;
691 *addr_len
= sizeof(*lsa
);
693 if (flags
& MSG_ERRQUEUE
)
694 return ipv6_recv_error(sk
, msg
, len
, addr_len
);
696 skb
= skb_recv_datagram(sk
, flags
, noblock
, &err
);
702 msg
->msg_flags
|= MSG_TRUNC
;
706 err
= skb_copy_datagram_msg(skb
, 0, msg
, copied
);
710 sock_recv_timestamp(msg
, sk
, skb
);
712 /* Copy the address. */
714 lsa
->l2tp_family
= AF_INET6
;
715 lsa
->l2tp_unused
= 0;
716 lsa
->l2tp_addr
= ipv6_hdr(skb
)->saddr
;
717 lsa
->l2tp_flowinfo
= 0;
718 lsa
->l2tp_scope_id
= 0;
719 lsa
->l2tp_conn_id
= 0;
720 if (ipv6_addr_type(&lsa
->l2tp_addr
) & IPV6_ADDR_LINKLOCAL
)
721 lsa
->l2tp_scope_id
= inet6_iif(skb
);
725 ip6_datagram_recv_ctl(sk
, msg
, skb
);
727 if (flags
& MSG_TRUNC
)
730 skb_free_datagram(sk
, skb
);
732 return err
? err
: copied
;
735 static struct proto l2tp_ip6_prot
= {
737 .owner
= THIS_MODULE
,
738 .init
= l2tp_ip6_open
,
739 .close
= l2tp_ip6_close
,
740 .bind
= l2tp_ip6_bind
,
741 .connect
= l2tp_ip6_connect
,
742 .disconnect
= l2tp_ip6_disconnect
,
744 .destroy
= l2tp_ip6_destroy_sock
,
745 .setsockopt
= ipv6_setsockopt
,
746 .getsockopt
= ipv6_getsockopt
,
747 .sendmsg
= l2tp_ip6_sendmsg
,
748 .recvmsg
= l2tp_ip6_recvmsg
,
749 .backlog_rcv
= l2tp_ip6_backlog_recv
,
751 .unhash
= inet_unhash
,
752 .obj_size
= sizeof(struct l2tp_ip6_sock
),
754 .compat_setsockopt
= compat_ipv6_setsockopt
,
755 .compat_getsockopt
= compat_ipv6_getsockopt
,
759 static const struct proto_ops l2tp_ip6_ops
= {
761 .owner
= THIS_MODULE
,
762 .release
= inet6_release
,
764 .connect
= inet_dgram_connect
,
765 .socketpair
= sock_no_socketpair
,
766 .accept
= sock_no_accept
,
767 .getname
= l2tp_ip6_getname
,
768 .poll
= datagram_poll
,
769 .ioctl
= inet6_ioctl
,
770 .listen
= sock_no_listen
,
771 .shutdown
= inet_shutdown
,
772 .setsockopt
= sock_common_setsockopt
,
773 .getsockopt
= sock_common_getsockopt
,
774 .sendmsg
= inet_sendmsg
,
775 .recvmsg
= sock_common_recvmsg
,
776 .mmap
= sock_no_mmap
,
777 .sendpage
= sock_no_sendpage
,
779 .compat_setsockopt
= compat_sock_common_setsockopt
,
780 .compat_getsockopt
= compat_sock_common_getsockopt
,
784 static struct inet_protosw l2tp_ip6_protosw
= {
786 .protocol
= IPPROTO_L2TP
,
787 .prot
= &l2tp_ip6_prot
,
788 .ops
= &l2tp_ip6_ops
,
791 static struct inet6_protocol l2tp_ip6_protocol __read_mostly
= {
792 .handler
= l2tp_ip6_recv
,
795 static int __init
l2tp_ip6_init(void)
799 pr_info("L2TP IP encapsulation support for IPv6 (L2TPv3)\n");
801 err
= proto_register(&l2tp_ip6_prot
, 1);
805 err
= inet6_add_protocol(&l2tp_ip6_protocol
, IPPROTO_L2TP
);
809 inet6_register_protosw(&l2tp_ip6_protosw
);
813 proto_unregister(&l2tp_ip6_prot
);
818 static void __exit
l2tp_ip6_exit(void)
820 inet6_unregister_protosw(&l2tp_ip6_protosw
);
821 inet6_del_protocol(&l2tp_ip6_protocol
, IPPROTO_L2TP
);
822 proto_unregister(&l2tp_ip6_prot
);
825 module_init(l2tp_ip6_init
);
826 module_exit(l2tp_ip6_exit
);
828 MODULE_LICENSE("GPL");
829 MODULE_AUTHOR("Chris Elston <celston@katalix.com>");
830 MODULE_DESCRIPTION("L2TP IP encapsulation for IPv6");
831 MODULE_VERSION("1.0");
833 /* Use the value of SOCK_DGRAM (2) directory, because __stringify doesn't like
836 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6
, 2, IPPROTO_L2TP
);
837 MODULE_ALIAS_NET_PF_PROTO(PF_INET6
, IPPROTO_L2TP
);