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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 try-
			       ing to send a datagram with the destination ad-
			       dress specified and the socket is already  con-
			       nected.

       ENOTCONN		       An  attempt was made to send a datagram,	but no
			       destination  address  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 op-
			       tion on an IPv6 socket.

       EINVAL		       An attempt was made to set an invalid  or  mal-
			       formed socket option.

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

SunOS 5.10			  10 Nov 1999			     icmp6(7P)

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | DIAGNOSTICS

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