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	1	.\" Copyright (c) 1983, 1987, 1991, 1993
	2	.\" The Regents of the University of California. All rights reserved.
	3	.\"
	4	.\" Redistribution and use in source and binary forms, with or without
	5	.\" modification, are permitted provided that the following conditions
	6	.\" are met:
	7	.\" 1. Redistributions of source code must retain the above copyright
	8	.\" notice, this list of conditions and the following disclaimer.
	9	.\" 2. Redistributions in binary form must reproduce the above copyright
	10	.\" notice, this list of conditions and the following disclaimer in the
	11	.\" documentation and/or other materials provided with the distribution.
	12	.\" 3. All advertising materials mentioning features or use of this software
	13	.\" must display the following acknowledgement:
	14	.\" This product includes software developed by the University of
	15	.\" California, Berkeley and its contributors.
	16	.\" 4. Neither the name of the University nor the names of its contributors
	17	.\" may be used to endorse or promote products derived from this software
	18	.\" without specific prior written permission.
	19	.\"
	20	.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	21	.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	22	.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	23	.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	24	.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	25	.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	26	.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	27	.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	28	.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	29	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	30	.\" SUCH DAMAGE.
	31	.\"
	32	.\" $Id: inet6_rthdr_space.3,v 1.3 2005/01/19 00:30:03 majka Exp $
	33	.\" $FreeBSD: src/lib/libc/net/inet6_rthdr_space.3,v 1.1.2.5 2001/08/17 15:42:38 ru Exp $
	34	.\"
	35	.Dd December 10, 1999
	36	.Dt INET6_RTHDR_SPACE 3
	37	.Os
	38	.\"
	39	.Sh NAME
	40	.Nm inet6_rthdr_space ,
	41	.Nm inet6_rthdr_init ,
	42	.Nm inet6_rthdr_add ,
	43	.Nm inet6_rthdr_lasthop ,
	44	.Nm inet6_rthdr_reverse ,
	45	.Nm inet6_rthdr_segments ,
	46	.Nm inet6_rthdr_getaddr ,
	47	.Nm inet6_rthdr_getflags
	48	.Nd IPv6 Routing Header Options manipulation
	49	.\"
	50	.Sh LIBRARY
	51	.Lb libc
	52	.Sh SYNOPSIS
	53	.Fd #include <sys/types.h>
	54	.Fd #include <netinet/in.h>
	55	.Ft size_t
	56	.Fn inet6_rthdr_space "int type" "int segments"
	57	.Ft "struct cmsghdr *"
	58	.Fn inet6_rthdr_init "void *bp" "int type"
	59	.Ft int
	60	.Fn inet6_rthdr_add "struct cmsghdr cmsg" "const struct in6_addr addr" "unsigned int flags"
	61	.Ft int
	62	.Fn inet6_rthdr_lasthop "struct cmsghdr *cmsg" "unsigned int flags"
	63	.Ft int
	64	.Fn inet6_rthdr_reverse "const struct cmsghdr in" "struct cmsghdr out"
	65	.Ft int
	66	.Fn inet6_rthdr_segments "const struct cmsghdr *cmsg"
	67	.Ft "struct in6_addr *"
	68	.Fn inet6_rthdr_getaddr "struct cmsghdr *cmsg" "int index"
	69	.Ft int
	70	.Fn inet6_rthdr_getflags "const struct cmsghdr *cmsg" "int index"
	71	.\"
	72	.Sh DESCRIPTION
	73	RFC2292 IPv6 advanced API defines eight
	74	functions that the application calls to build and examine a Routing
	75	header. Four functions build a Routing header:
	76	.Bl -hang
	77	.It Fn inet6_rthdr_space
	78	return #bytes required for ancillary data
	79	.It Fn inet6_rthdr_init
	80	initialize ancillary data for Routing header
	81	.It Fn inet6_rthdr_add
	82	add IPv6 address & flags to Routing header
	83	.It Fn inet6_rthdr_lasthop
	84	specify the flags for the final hop
	85	.El
	86	.Pp
	87	Four functions deal with a returned Routing header:
	88	.Bl -hang
	89	.It Fn inet6_rthdr_reverse
	90	reverse a Routing header
	91	.It Fn inet6_rthdr_segments
	92	return #segments in a Routing header
	93	.It Fn inet6_rthdr_getaddr
	94	fetch one address from a Routing header
	95	.It Fn inet6_rthdr_getflags
	96	fetch one flag from a Routing header
	97	.El
	98	.Pp
	99	The function prototypes for these functions are all in the
	100	.Aq Li netinet/in.h
	101	header.
	102	.Pp
	103	The full description of these functions is available in RFC2292.
	104	.\"
	105	.Sh DIAGNOSTICS
	106	.Fn inet6_rthdr_space
	107	returns 0 on errors.
	108	.Pp
	109	.Fn inet6_rthdr_add ,
	110	.Fn inet6_rthdr_lasthop
	111	and
	112	.Fn inet6_rthdr_reverse
	113	return 0 on success, and returns -1 on error.
	114	.Pp
	115	.Fn inet6_rthdr_init
	116	and
	117	.Fn inet6_rthdr_getaddr
	118	return
	119	.Dv NULL
	120	on error.
	121	.Pp
	122	.Fn inet6_rthdr_segments
	123	and
	124	.Fn inet6_rthdr_getflags
	125	return -1 on error.
	126	.\"
	127	.Sh EXAMPLES
	128	RFC2292 gives comprehensive examples in chapter 8.
	129	.\"
	130	.Sh SEE ALSO
	131	.Rs
	132	.%A W. Stevens
	133	.%A M. Thomas
	134	.%T "Advanced Sockets API for IPv6"
	135	.%N RFC2292
	136	.%D February 1998
	137	.Re
	138	.Rs
	139	.%A S. Deering
	140	.%A R. Hinden
	141	.%T "Internet Protocol, Version 6 (IPv6) Specification"
	142	.%N RFC2460
	143	.%D December 1998
	144	.Re
	145	.\"
	146	.Sh HISTORY
	147	The implementation first appeared in KAME advanced networking kit.
	148	.\"
	149	.Sh STANDARDS
	150	The functions
	151	are documented in
	152	.Dq Advanced Sockets API for IPv6
	153	(RFC2292).
	154	.\"
	155	.Sh BUGS
	156	The text was shamelessly copied from RFC2292.
	157	.Pp
	158	.Fn inet6_rthdr_reverse
	159	is not implemented yet.