4345758876
Avoid using parenthesis enclosure macros (.Pq and .Po/.Pc) with plain text. Not only this slows down the mdoc(7) processing significantly, but it also has an undesired (in this case) effect of disabling hyphenation within the entire enclosed block.
268 lines
8.0 KiB
Groff
268 lines
8.0 KiB
Groff
.\" 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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.\" KAME $Id: icmp6.4,v 1.1 1999/12/17 09:47:01 itojun Exp $
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.\" $FreeBSD$
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.\"
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.Dd March 13, 2000
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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/types.h>
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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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(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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.Pp
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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 -offset indent
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.It
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.Ft void
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.Fn ICMP6_FILTER_SETPASSALL "struct icmp6_filter *filterp"
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.It
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.Ft void
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.Fn ICMP6_FILTER_SETBLOCKALL "struct icmp6_filter *filterp"
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.It
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.Ft void
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.Fn ICMP6_FILTER_SETPASS "int type" "struct icmp6_filter *filterp"
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.It
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.Ft void
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.Fn ICMP6_FILTER_SETBLOCK "int type" "struct icmp6_filter *filterp"
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.It
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.Ft int
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.Fn ICMP6_FILTER_WILLPASS "int type" "const struct icmp6_filter *filterp"
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.It
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.Ft int
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.Fn ICMP6_FILTER_WILLBLOCK "int type" "const struct icmp6_filter *filterp"
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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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(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
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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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(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 ERRORS
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A socket operation may fail with one of the following errors returned:
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.Bl -tag -width Er
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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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(which is descendant of WIDE hydrangea IPv6 stack kit).
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.Pp
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Part of the document was shamelessly copied from RFC2292.
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