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icmp6(7P)			   Protocols			     icmp6(7P)

NAME
       icmp6 - Internet	Control	Message	Protocol for Internet Protocol Version
       6

SYNOPSIS
       #include	<sys/socket.h>
       #include	<netinet/in.h>
       #include	<netinet/ip_icmp.h>
       #include	<netinet/icmp6.h>

       s = socket(AF_INET6, SOCK_RAW, proto);

       t = t_open("/dev/icmp6",	O_RDWR);

DESCRIPTION
       The ICMP6 protocol is the error and control message protocol used  with
       Version	6 of the Internet Protocol. It is used by the kernel to	handle
       and report errors in protocol processing. It  is	 also  used  for  IPv6
       neighbor	 and  router  discovery,  and  for  multicast group membership
       queries and reports. It may also	be  accessed  by  programs  using  the
       socket  interface  or  the  Transport Level Interface (TLI) for network
       monitoring and diagnostic functions. When used with the	socket	inter-
       face,  a	"raw socket" type is used. The protocol	number for ICMP6, used
       in the proto parameter to the socket call, can be obtained from getpro-
       tobyname(3SOCKET).  ICMP6  file descriptors and sockets are connection-
       less and	are normally used with the t_sndudata  /  t_rcvudata  and  the
       sendto()	  /   recvfrom()  calls.  They	may  also  be  used  with  the
       sendmsg()/recvgmsg() calls when sending or receiving ancillary data.

       Outgoing	packets	automatically have  an	Internet  Protocol  Version  6
       (IPv6)  header and zero or more IPv6 extension headers prepended. These
       headers are prepended  by  the  kernel.	 Unlike	 ICMP  for  IPv4,  the
       IP_HDRINCL  option  is  not  supported for ICMP6, so ICMP6 applications
       neither build their own outbound	IPv6 headers, nor do they receive  the
       inbound	IPv6  headers  with  received data. IPv6 extension headers and
       relevant	fields of the IPv6 header may be set or	received as  ancillary
       data  to	 a  sendmsg(3SOCKET)  or recvmsg(3SOCKET) system call. Each of
       these fields and	extension headers may also be set on a per socket  ba-
       sis with	the setsockopt(3SOCKET)	system call. Such "sticky" options are
       used on all outgoing packets unless overridden by ancillary data.  When
       any  ancillary data is present with a sendmsg(3SOCKET) system call, all
       sticky options are ignored for that system call,	but  subsequently  re-
       main configured.

       ICMP6  is  a  datagram protocol layered above IPv6. Received ICMP6 mes-
       sages may be reflected back to users of higher-level protocols such  as
       TCP  or UDP as error returns from system	calls. A copy of each ICMP6er-
       ror message received by the system is provided to every	holder	of  an
       open ICMP6 socket or TLI	descriptor.

SEE ALSO
       getprotobyname(3SOCKET),	       recv(3SOCKET),	     recvmsg(3SOCKET),
       send(3SOCKET), sendmsg(3SOCKET),	setsockopt(3SOCKET), t_rcvudata(3NSL),
       t_sndudata(3NSL), inet6(7P), ip6(7P), routing(7P)

       Conta,  A. and Deering, S., RFC 2463, Internet Control Message Protocol
       (ICMPv6)	for the	Internet Protocol Version 6 (IPv6) Specification,  The
       Internet	Society, December 1998.

DIAGNOSTICS
       A socket	operation may fail with	one of the following errors returned:

	EISCONN
	     An	 attempt  was made to establish	a connection on	a socket which
	     already has one, or when trying to	send a datagram	with the  des-
	     tination address specified	and the	socket is already connected.

       ENOTCONN
	     An	 attempt  was  made to send a datagram,	but no destination ad-
	     dress is specified, and the socket	has not	been connected.

       ENOBUFS
	     The system	ran out	of memory for an internal data structure.

       EADDRNOTAVAIL
	     An	attempt	was made to create a socket with a network address for
	     which no network interface	exists.

       ENOMEM
	     The  system  was  unable  to allocate memory for an internal data
	     structure.

       ENOPROTOOPT
	     An	attempt	was made to set	an  IPv4  socket  option  on  an  IPv6
	     socket.

       EINVAL
	     An	attempt	was made to set	an invalid or malformed	socket option.

       EAFNOSUPPORT
	     An	 attempt  was made to bind or connect to an IPv4 or mapped ad-
	     dress, or to specify an IPv4 or mapped address as the next	hop.

SunOS 5.9			  10 Nov 1999			     icmp6(7P)

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | DIAGNOSTICS

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