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-.\" Copyright (C) 1999 WIDE Project.
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. Neither the name of the project nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\" Copyright (c) 1986, 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"	KAME $Id: icmp6.4,v 1.1 1999/12/17 09:47:01 itojun Exp $
-.\" $FreeBSD$
-.\"
-.Dd March 13, 2000
-.Dt ICMP6 4
-.Os
-.\"
-.Sh NAME
-.Nm icmp6
-.Nd Internet Control Message Protocol for IPv6
-.\"
-.Sh SYNOPSIS
-.In sys/types.h
-.In sys/socket.h
-.In netinet/in.h
-.In netinet/icmp6.h
-.Ft int
-.Fn socket AF_INET6 SOCK_RAW proto
-.\"
-.Sh DESCRIPTION
-.Tn ICMPv6
-is the error and control message protocol used
-by
-.Tn IPv6
-and the Internet protocol family.
-It may be accessed through a
-.Dq raw socket
-for network monitoring and diagnostic functions.
-The
-.Fa proto
-parameter to the socket call to create an
-.Tn ICMPv6
-socket is obtained from
-.Xr getprotobyname 3 ,
-or you can use
-.Dv IPPROTO_ICMPV6 .
-.Tn ICMPv6
-sockets are connectionless, and are normally used with the
-.Xr sendto 2
-and
-.Xr recvfrom 2
-calls, though the
-.Xr connect 2
-call may also be used to fix the destination for future packets
-(in which case the
-.Xr read 2
-or
-.Xr recv 2
-and
-.Xr write 2
-or
-.Xr send 2
-system calls may be used).
-.Pp
-Outgoing packets automatically have an
-.Tn IPv6
-header prepended to them
-(based on the destination address).
-.Tn ICMPv6
-pseudo header checksum field
-.Pq Li icmp6_cksum
-will be filled automatically by the kernel.
-Incoming packets are received without the
-.Tn IPv6
-header nor IPv6 extension headers.
-Notice that this behavior is opposite from
-.Tn IPv4
-raw sockets and.
-.Tn ICMPv4
-sockets.
-.Pp
-.Ss ICMPv6 type/code filter
-Each
-.Tn ICMPv6
-raw socket has an associated filter whose datatype is defined as
-.Li struct icmp6_filter ;
-.Pp
-This structure, along with the macros and constants defined later in
-this section, are defined as a result of including the
-.In netinet/icmp6.h
-header.
-.Pp
-The current filter is fetched and stored using
-.Xr getsockopt 2
-and
-.Xr setsockopt 2
-with a level of
-.Dv IPPROTO_ICMPV6
-and an option name of
-.Dv ICMP6_FILTER .
-.Pp
-Six macros operate on an icmp6_filter structure:
-.\" is "Fn" legal for macros?
-.Bl -item -offset indent
-.It
-.Ft void
-.Fn ICMP6_FILTER_SETPASSALL "struct icmp6_filter *filterp"
-.It
-.Ft void
-.Fn ICMP6_FILTER_SETBLOCKALL "struct icmp6_filter *filterp"
-.It
-.Ft void
-.Fn ICMP6_FILTER_SETPASS "int type" "struct icmp6_filter *filterp"
-.It
-.Ft void
-.Fn ICMP6_FILTER_SETBLOCK "int type" "struct icmp6_filter *filterp"
-.It
-.Ft int
-.Fn ICMP6_FILTER_WILLPASS "int type" "const struct icmp6_filter *filterp"
-.It
-.Ft int
-.Fn ICMP6_FILTER_WILLBLOCK "int type" "const struct icmp6_filter *filterp"
-.El
-.Pp
-The first argument to the last four macros
-(an integer)
-is an
-.Tn ICMPv6
-message type, between 0 and 255.
-The pointer argument to all six
-macros is a pointer to a filter that is modified by the first four
-macros examined by the last two macros.
-.Pp
-The first two macros,
-.Dv SETPASSALL
-and
-.Dv SETBLOCKALL ,
-let us specify that
-all
-.Tn ICMPv6
-messages are passed to the application or that all
-.Tn ICMPv6
-messages are blocked from being passed to the application.
-.Pp
-The next two macros,
-.Dv SETPASS
-and
-.Dv SETBLOCK ,
-let us specify that
-messages of a given
-.Tn ICMPv6
-type should be passed to the application
-or not passed to the application
-(blocked).
-.Pp
-The final two macros,
-.Dv WILLPASS
-and
-.Dv WILLBLOCK ,
-return true or false
-depending whether the specified message type is passed to the
-application or blocked from being passed to the application by the
-filter pointed to by the second argument.
-.Pp
-When an
-.Tn ICMPv6
-raw socket is created, it will by default pass all
-.Tn ICMPv6
-message types to the application.
-.Pp
-For further discussions see RFC2292.
-.\"
-.Sh ERRORS
-A socket operation may fail with one of the following errors returned:
-.Bl -tag -width Er
-.It Bq Er EISCONN
-when trying to establish a connection on a socket which
-already has one, or when trying to send a datagram with the destination
-address specified and the socket is already connected;
-.It Bq Er ENOTCONN
-when trying to send a datagram, but
-no destination address is specified, and the socket hasn't been
-connected;
-.It Bq Er ENOBUFS
-when the system runs out of memory for
-an internal data structure;
-.It Bq Er EADDRNOTAVAIL
-when an attempt is made to create a
-socket with a network address for which no network interface exists.
-.El
-.\"
-.Sh SEE ALSO
-.Xr recv 2 ,
-.Xr send 2 ,
-.Xr inet6 4 ,
-.Xr intro 4 ,
-.Xr ip6 4
-.Rs
-.%A W. Stevens
-.%A M. Thomas
-.%R RFC
-.%N 2292
-.%D February 1998
-.%T "Advanced Sockets API for IPv6"
-.Re
-.Rs
-.%A A. Conta
-.%A S. Deering
-.%R RFC
-.%N 2463
-.%D December 1998
-.%T "Internet Control Message Protocol (ICMPv6) for the Internet Protocol Version 6 (IPv6) Specification"
-.Re
-.\"
-.Sh HISTORY
-The implementation is based on KAME stack
-(which is descendant of WIDE hydrangea IPv6 stack kit).
-.Pp
-Part of the document was shamelessly copied from RFC2292.