2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
321 lines
8.6 KiB
Groff
321 lines
8.6 KiB
Groff
.\" $NetBSD: inet6_rthdr_space.3,v 1.16 2010/03/22 19:30:54 joerg Exp $
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.\" $KAME: inet6_rthdr_space.3,v 1.8 2000/05/17 14:30:15 itojun Exp $
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.\"
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.\" Copyright (c) 1983, 1987, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd December 10, 1999
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.Dt INET6_RTHDR_SPACE 3
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.Os
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.\"
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.Sh NAME
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.Nm inet6_rthdr_space ,
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.Nm inet6_rthdr_init ,
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.Nm inet6_rthdr_add ,
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.Nm inet6_rthdr_lasthop ,
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.Nm inet6_rthdr_reverse ,
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.Nm inet6_rthdr_segments ,
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.Nm inet6_rthdr_getaddr ,
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.Nm inet6_rthdr_getflags
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.Nd IPv6 Routing Header Options manipulation
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.\"
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.Sh SYNOPSIS
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.In netinet/in.h
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.Ft size_t
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.Fn inet6_rthdr_space "int type" "int segments"
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.Ft "struct cmsghdr *"
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.Fn inet6_rthdr_init "void *bp" "int type"
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.Ft int
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.Fn inet6_rthdr_add "struct cmsghdr *cmsg" "const struct in6_addr *addr" "unsigned int flags"
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.Ft int
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.Fn inet6_rthdr_lasthop "struct cmsghdr *cmsg" "unsigned int flags"
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.Ft int
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.Fn inet6_rthdr_reverse "const struct cmsghdr *in" "struct cmsghdr *out"
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.Ft int
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.Fn inet6_rthdr_segments "const struct cmsghdr *cmsg"
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.Ft "struct in6_addr *"
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.Fn inet6_rthdr_getaddr "struct cmsghdr *cmsg" "int index"
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.Ft int
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.Fn inet6_rthdr_getflags "const struct cmsghdr *cmsg" "int index"
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.\"
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.Sh DESCRIPTION
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RFC 2292 IPv6 advanced API defines eight
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functions that the application calls to build and examine a Routing
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header.
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Four functions build a Routing header:
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.Bl -hang
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.It Fn inet6_rthdr_space
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return #bytes required for ancillary data
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.It Fn inet6_rthdr_init
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initialize ancillary data for Routing header
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.It Fn inet6_rthdr_add
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add IPv6 address \*[Am] flags to Routing header
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.It Fn inet6_rthdr_lasthop
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specify the flags for the final hop
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.El
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.Pp
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Four functions deal with a returned Routing header:
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.Bl -hang
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.It Fn inet6_rthdr_reverse
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reverse a Routing header
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.It Fn inet6_rthdr_segments
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return #segments in a Routing header
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.It Fn inet6_rthdr_getaddr
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fetch one address from a Routing header
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.It Fn inet6_rthdr_getflags
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fetch one flag from a Routing header
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.El
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.Pp
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The function prototypes for these functions are all in the
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.In netinet/in.h
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header.
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.\"
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.Ss inet6_rthdr_space
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This function returns the number of bytes required to hold a Routing
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header of the specified
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.Fa type
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containing the specified number of
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.Fa segments
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.Pq addresses .
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For an IPv6 Type 0 Routing header, the number
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of segments must be between 1 and 23, inclusive.
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The return value
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includes the size of the cmsghdr structure that precedes the Routing
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header, and any required padding.
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.Pp
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If the return value is 0, then either the type of the Routing header
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is not supported by this implementation or the number of segments is
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invalid for this type of Routing header.
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.Pp
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Note: This function returns the size but does not allocate the space
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required for the ancillary data.
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This allows an application to
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allocate a larger buffer, if other ancillary data objects are
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desired, since all the ancillary data objects must be specified to
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.Xr sendmsg 2
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as a single
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.Li msg_control
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buffer.
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.\"
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.Ss inet6_rthdr_init
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This function initializes the buffer pointed to by
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.Fa bp
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to contain a
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.Li cmsghdr
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structure followed by a Routing header of the specified
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.Fa type .
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The
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.Li cmsg_len
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member of the
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.Li cmsghdr
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structure is initialized to the
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size of the structure plus the amount of space required by the
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Routing header.
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The
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.Li cmsg_level
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and
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.Li cmsg_type
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members are also initialized as required.
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.Pp
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The caller must allocate the buffer and its size can be determined by
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calling
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.Fn inet6_rthdr_space .
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.Pp
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Upon success the return value is the pointer to the
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.Li cmsghdr
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structure, and this is then used as the first argument to the next
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two functions.
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Upon an error the return value is
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.Dv NULL .
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.\"
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.Ss inet6_rthdr_add
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This function adds the address pointed to by
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.Fa addr
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to the end of the
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Routing header being constructed and sets the type of this hop to the
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value of
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.Fa flags .
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For an IPv6 Type 0 Routing header,
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.Fa flags
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must be
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either
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.Dv IPV6_RTHDR_LOOSE
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or
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.Dv IPV6_RTHDR_STRICT .
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.Pp
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If successful, the
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.Li cmsg_len
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member of the
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.Li cmsghdr
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structure is
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updated to account for the new address in the Routing header and the
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return value of the function is 0.
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Upon an error the return value of
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the function is -1.
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.\"
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.Ss inet6_rthdr_lasthop
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This function specifies the Strict/Loose flag for the final hop of a
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Routing header.
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For an IPv6 Type 0 Routing header,
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.Fa flags
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must be either
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.Dv IPV6_RTHDR_LOOSE
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or
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.Dv IPV6_RTHDR_STRICT .
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.Pp
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The return value of the function is 0 upon success, or -1 upon an error.
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.Pp
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Notice that a Routing header specifying
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.Li N
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intermediate nodes requires
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.Li N+1
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Strict/Loose flags.
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This requires
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.Li N
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calls to
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.Fn inet6_rthdr_add
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followed by one call to
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.Fn inet6_rthdr_lasthop .
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.\"
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.Ss inet6_rthdr_reverse
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This function takes a Routing header that was received as ancillary
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data
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.Po
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pointed to by the first argument,
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.Fa in
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.Pc
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and writes a new Routing
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header that sends datagrams along the reverse of that route.
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Both
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arguments are allowed to point to the same buffer
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.Pq that is, the reversal can occur in place .
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.Pp
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The return value of the function is 0 on success, or -1 upon an
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error.
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.\"
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.Ss inet6_rthdr_segments
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This function returns the number of segments
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.Pq addresses
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contained in
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the Routing header described by
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.Fa cmsg .
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On success the return value is
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between 1 and 23, inclusive.
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The return value of the function is -1 upon an error.
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.\"
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.Ss inet6_rthdr_getaddr
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This function returns a pointer to the IPv6 address specified by
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.Fa index
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.Po
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which must have a value between 1 and the value returned by
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.Fn inet6_rthdr_segments
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.Pc
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in the Routing header described by
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.Fa cmsg .
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An
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application should first call
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.Fn inet6_rthdr_segments
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to obtain the number of segments in the Routing header.
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.Pp
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Upon an error the return value of the function is
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.Dv NULL .
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.\"
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.Ss inet6_rthdr_getflags
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This function returns the flags value specified by
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.Fa index
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.Po
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which must
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have a value between 0 and the value returned by
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.Fn inet6_rthdr_segments
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.Pc
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in the Routing header described by
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.Fa cmsg .
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For an IPv6 Type 0 Routing header the return value will be either
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.Dv IPV6_RTHDR_LOOSE
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or
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.Dv IPV6_RTHDR_STRICT .
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.Pp
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Upon an error the return value of the function is -1.
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.Pp
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Note: Addresses are indexed starting at 1, and flags starting at 0,
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to maintain consistency with the terminology and figures in RFC 2460.
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.\"
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.Sh EXAMPLES
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RFC 2292 gives comprehensive examples in chapter 8.
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.\"
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.Sh DIAGNOSTICS
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.Fn inet6_rthdr_space
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returns 0 on errors.
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.Pp
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.Fn inet6_rthdr_add ,
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.Fn inet6_rthdr_lasthop
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and
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.Fn inet6_rthdr_reverse
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return 0 on success, and returns -1 on error.
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.Pp
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.Fn inet6_rthdr_init
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and
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.Fn inet6_rthdr_getaddr
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return
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.Dv NULL
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on error.
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.Pp
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.Fn inet6_rthdr_segments
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and
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.Fn inet6_rthdr_getflags
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return -1 on error.
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.\"
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.Sh SEE ALSO
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.Rs
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.%A W. Stevens
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.%A M. Thomas
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.%T "Advanced Sockets API for IPv6"
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.%N RFC 2292
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.%D February 1998
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.Re
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.Rs
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.%A S. Deering
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.%A R. Hinden
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.%T "Internet Protocol, Version 6 (IPv6) Specification"
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.%N RFC 2460
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.%D December 1998
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.Re
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.\"
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.Sh STANDARDS
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The functions
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are documented in
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.Dq Advanced Sockets API for IPv6
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.Pq RFC 2292 .
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.\"
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.Sh HISTORY
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The implementation first appeared in KAME advanced networking kit.
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.\"
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.Sh BUGS
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The text was shamelessly copied from RFC 2292.
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.Pp
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.Fn inet6_rthdr_reverse
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is not implemented yet.
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