270 lines
8.0 KiB
Groff
270 lines
8.0 KiB
Groff
.\" 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 KAME
|
|
.\"
|
|
.Sh NAME
|
|
.Nm icmp6
|
|
.Nd Internet Control Message Protocol for IPv6
|
|
.\"
|
|
.Sh SYNOPSIS
|
|
.Fd #include <sys/types.h>
|
|
.Fd #include <sys/socket.h>
|
|
.Fd #include <netinet/in.h>
|
|
.Fd #include <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
|
|
.Pq 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
|
|
.Aq Li 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
|
|
.Pq 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
|
|
.Pq 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
|
|
.Po
|
|
which is descendant of WIDE hydrangea IPv6 stack kit
|
|
.Pc .
|
|
.Pp
|
|
Part of the document was shamelessly copied from RFC2292.
|