261 lines
8.0 KiB
Groff
261 lines
8.0 KiB
Groff
.\" $NetBSD: icmp6.4,v 1.4 2001/09/22 00:57:40 wiz Exp $
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.\" $KAME: icmp6.4,v 1.3 2000/11/24 08:44:40 itojun Exp $
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.\"
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.\" Copyright (C) 1999 WIDE Project.
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.\" 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 project 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 PROJECT 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 PROJECT 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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.\" Copyright (c) 1986, 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. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. 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 17, 1999
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.Dt ICMP6 4
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.Os
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."
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.Sh NAME
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.Nm icmp6
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.Nd Internet Control Message Protocol for IPv6
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."
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.Sh SYNOPSIS
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.Fd #include <sys/socket.h>
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.Fd #include <netinet/in.h>
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.Fd #include <netinet/icmp6.h>
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.Ft int
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.Fn socket AF_INET6 SOCK_RAW proto
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."
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.Sh DESCRIPTION
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.Tn ICMPv6
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is the error and control message protocol used
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by
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.Tn IPv6
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and the Internet protocol family.
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It may be accessed through a
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.Dq raw socket
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for network monitoring and diagnostic functions.
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The
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.Fa proto
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parameter to the socket call to create an
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.Tn ICMPv6
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socket is obtained from
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.Xr getprotobyname 3 ,
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or you can use
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.Dv IPPROTO_ICMPV6 .
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.Tn ICMPv6
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sockets are connectionless, and are normally used with the
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.Xr sendto 2
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and
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.Xr recvfrom 2
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calls, though the
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.Xr connect 2
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call may also be used to fix the destination for future packets
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(in which case the
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.Xr read 2
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or
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.Xr recv 2
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and
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.Xr write 2
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or
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.Xr send 2
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system calls may be used).
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.Pp
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Outgoing packets automatically have an
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.Tn IPv6
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header prepended to them
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.Pq based on the destination address .
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.Tn ICMPv6
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pseudo header checksum field
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.Pq Li icmp6_cksum
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will be filled automatically by the kernel.
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Incoming packets are received without the
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.Tn IPv6
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header nor IPv6 extension headers.
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Notice that this behavior is opposite from
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.Tn IPv4
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raw sockets and.
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.Tn ICMPv4
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sockets.
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.Ss ICMPv6 type/code filter
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Each
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.Tn ICMPv6
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raw socket has an associated filter whose datatype is defined as
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.Li struct icmp6_filter ;
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.Pp
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This structure, along with the macros and constants defined later in
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this section, are defined as a result of including the
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.Aq Li netinet/icmp6.h
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header.
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.Pp
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The current filter is fetched and stored using
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.Xr getsockopt 2
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and
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.Xr setsockopt 2
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with a level of
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.Dv IPPROTO_ICMPV6
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and an option name of
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.Dv ICMP6_FILTER .
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.Pp
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Six macros operate on an icmp6_filter structure:
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.\" is "Fn" legal for macros?
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.Bl -item -compact -offset indent
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.It Ft void
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.Fn ICMP6_FILTER_SETPASSALL "struct icmp6_filter *"
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.It Ft void
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.Fn ICMP6_FILTER_SETBLOCKALL "struct icmp6_filter *"
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.It Ft void
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.Fn ICMP6_FILTER_SETPASS "int" "struct icmp6_filter *"
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.It Ft void
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.Fn ICMP6_FILTER_SETBLOCK "int" "struct icmp6_filter *"
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.It Ft int
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.Fn ICMP6_FILTER_WILLPASS "int" "const struct icmp6_filter *"
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.It Ft int
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.Fn ICMP6_FILTER_WILLBLOCK "int" "const struct icmp6_filter *"
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.El
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.Pp
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The first argument to the last four macros
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.Pq an integer
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is an
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.Tn ICMPv6
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message type, between 0 and 255.
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The pointer argument to all six
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macros is a pointer to a filter that is modified by the first four
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macros examined by the last two macros.
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.Pp
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The first two macros,
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.Dv SETPASSALL
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and
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.Dv SETBLOCKALL ,
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let us specify that
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all
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.Tn ICMPv6 messages are passed to the application or that all
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.Tn ICMPv6
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messages are blocked from being passed to the application.
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.Pp
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The next two macros,
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.Dv SETPASS
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and
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.Dv SETBLOCK ,
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let us specify that
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messages of a given
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.Tn ICMPv6
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type should be passed to the application
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or not passed to the application
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.Pq blocked .
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.Pp
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The final two macros,
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.Dv WILLPASS
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and
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.Dv WILLBLOCK ,
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return true or false
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depending whether the specified message type is passed to the
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application or blocked from being passed to the application by the
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filter pointed to by the second argument.
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.Pp
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When an
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.Tn ICMPv6
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raw socket is created, it will by default pass all
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.Tn ICMPv6
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message types to the application.
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.Pp
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For further discussions see RFC2292.
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.\"
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.Sh DIAGNOSTICS
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A socket operation may fail with one of the following errors returned:
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.Bl -tag -width [EADDRNOTAVAIL]
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.It Bq Er EISCONN
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when trying to establish a connection on a socket which
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already has one, or when trying to send a datagram with the destination
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address specified and the socket is already connected;
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.It Bq Er ENOTCONN
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when trying to send a datagram, but
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no destination address is specified, and the socket hasn't been
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connected;
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.It Bq Er ENOBUFS
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when the system runs out of memory for
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an internal data structure;
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.It Bq Er EADDRNOTAVAIL
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when an attempt is made to create a
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socket with a network address for which no network interface exists.
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.El
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."
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.Sh SEE ALSO
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.Xr recv 2 ,
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.Xr send 2 ,
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.Xr inet6 4 ,
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.Xr intro 4 ,
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.Xr ip6 4
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.Rs
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.%A W. Stevens
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.%A M. Thomas
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.%R RFC
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.%N 2292
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.%D February 1998
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.%T "Advanced Sockets API for IPv6"
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.Re
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.Rs
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.%A A. Conta
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.%A S. Deering
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.%R RFC
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.%N 2463
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.%D December 1998
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.%T "Internet Control Message Protocol (ICMPv6) for the Internet Protocol Version 6 (IPv6) Specification"
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.Re
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."
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.Sh HISTORY
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The implementation is based on KAME stack
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.Po
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which is descendant of WIDE hydrangea IPv6 stack kit
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.Pc .
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.Pp
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Part of the document was shamelessly copied from RFC2292.
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