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<netinet/in.h>(P)	   POSIX Programmer's Manual	     <netinet/in.h>(P)

NAME
       netinet/in.h - Internet address family

SYNOPSIS
       #include <netinet/in.h>

DESCRIPTION
       The <netinet/in.h> header shall define the following types:

       in_port_t
	      Equivalent to the type uint16_t as defined in <inttypes.h> .

       in_addr_t
	      Equivalent to the type uint32_t as defined in <inttypes.h> .

       The sa_family_t type shall be defined as described in <sys/socket.h> .

       The  uint8_t  and  uint32_t type shall be defined as described in <int‐
       types.h>. Inclusion of the <netinet/in.h> header may also make  visible
       all symbols from <inttypes.h> and <sys/socket.h>.

       The  <netinet/in.h>  header  shall  define  the	in_addr structure that
       includes at least the following member:

	      in_addr_t	 s_addr

       The <netinet/in.h> header shall define the sockaddr_in  structure  that
       includes at least the following members (all in network byte order):

	      sa_family_t     sin_family   AF_INET.
	      in_port_t	      sin_port	   Port number.
	      struct in_addr  sin_addr	   IP address.

       The  sockaddr_in	 structure is used to store addresses for the Internet
       address family. Values of this type shall be cast  by  applications  to
       struct sockaddr for use with socket functions.

       The <netinet/in.h> header shall define the in6_addr structure that con‐
       tains at least the following member:

	      uint8_t s6_addr[16]

       This array is used to contain a 128-bit IPv6 address, stored in network
       byte order.

       The  <netinet/in.h> header shall define the sockaddr_in6 structure that
       includes at least the following members (all in network byte order):

	      sa_family_t      sin6_family    AF_INET6.
	      in_port_t	       sin6_port      Port number.
	      uint32_t	       sin6_flowinfo  IPv6 traffic class and flow information.
	      struct in6_addr  sin6_addr      IPv6 address.
	      uint32_t	       sin6_scope_id  Set of interfaces for a scope.

       The sockaddr_in6 structure shall be set to zero by an application prior
       to  using it, since implementations are free to have additional, imple‐
       mentation-defined fields in sockaddr_in6.

       The sin6_scope_id field is a 32-bit integer that identifies  a  set  of
       interfaces  as  appropriate for the scope of the address carried in the
       sin6_addr field. For a link  scope  sin6_addr,  the  application	 shall
       ensure  that sin6_scope_id is a link index. For a site scope sin6_addr,
       the application shall ensure that sin6_scope_id is a  site  index.  The
       mapping of sin6_scope_id to an interface or set of interfaces is imple‐
       mentation-defined.

       The <netinet/in.h> header shall declare the  following  external	 vari‐
       able:

	      const struct in6_addr in6addr_any

       This variable is initialized by the system to contain the wildcard IPv6
       address. The <netinet/in.h> header also	defines	 the  IN6ADDR_ANY_INIT
       macro.  This  macro must be constant at compile time and can be used to
       initialize a variable of type struct  in6_addr  to  the	IPv6  wildcard
       address.

       The  <netinet/in.h>  header  shall declare the following external vari‐
       able:

	      const struct in6_addr in6addr_loopback

       This variable is initialized by the system to contain the loopback IPv6
       address.	 The  <netinet/in.h>  header  also  defines  the IN6ADDR_LOOP‐
       BACK_INIT macro. This macro must be constant at compile time and can be
       used to initialize a variable of type struct in6_addr to the IPv6 loop‐
       back address.

       The <netinet/in.h> header shall define  the  ipv6_mreq  structure  that
       includes at least the following members:

	      struct in6_addr  ipv6mr_multiaddr	 IPv6 multicast address.
	      unsigned	       ipv6mr_interface	 Interface index.

       The  <netinet/in.h> header shall define the following macros for use as
       values of the level argument of getsockopt() and setsockopt():

       IPPROTO_IP
	      Internet protocol.

       IPPROTO_IPV6
	      Internet Protocol Version 6.

       IPPROTO_ICMP
	      Control message protocol.

       IPPROTO_RAW
	      Raw IP Packets Protocol.

       IPPROTO_TCP
	      Transmission control protocol.

       IPPROTO_UDP
	      User datagram protocol.

       The <netinet/in.h> header shall define the following macros for use  as
       destination addresses for connect(), sendmsg(), and sendto():

       INADDR_ANY
	      IPv4 local host address.

       INADDR_BROADCAST
	      IPv4 broadcast address.

       The  <netinet/in.h>  header  shall  define  the following macro to help
       applications declare buffers of the proper size to store IPv4 addresses
       in string form:

       INET_ADDRSTRLEN
	      16. Length of the string form for IP.

       The htonl(), htons(), ntohl(), and ntohs() functions shall be available
       as defined in <arpa/inet.h> . Inclusion of  the	<netinet/in.h>	header
       may also make visible all symbols from <arpa/inet.h> .

       The  <netinet/in.h>  header  shall  define  the following macro to help
       applications declare buffers of the proper size to store IPv6 addresses
       in string form:

       INET6_ADDRSTRLEN
	      46. Length of the string form for IPv6.

       The  <netinet/in.h> header shall define the following macros, with dis‐
       tinct integer values, for use in the option_name argument in  the  get‐
       sockopt() or setsockopt() functions at protocol level IPPROTO_IPV6:

       IPV6_JOIN_GROUP
	      Join a multicast group.

       IPV6_LEAVE_GROUP
	      Quit a multicast group.

       IPV6_MULTICAST_HOPS

	      Multicast hop limit.

       IPV6_MULTICAST_IF
	      Interface to use for outgoing multicast packets.

       IPV6_MULTICAST_LOOP

	      Multicast packets are delivered back to the local application.

       IPV6_UNICAST_HOPS
	      Unicast hop limit.

       IPV6_V6ONLY
	      Restrict AF_INET6 socket to IPv6 communications only.

       The  <netinet/in.h>  header shall define the following macros that test
       for special IPv6 addresses. Each macro is of type int and takes a  sin‐
       gle argument of type const struct in6_addr *:

       IN6_IS_ADDR_UNSPECIFIED

	      Unspecified address.

       IN6_IS_ADDR_LOOPBACK

	      Loopback address.

       IN6_IS_ADDR_MULTICAST

	      Multicast address.

       IN6_IS_ADDR_LINKLOCAL

	      Unicast link-local address.

       IN6_IS_ADDR_SITELOCAL

	      Unicast site-local address.

       IN6_IS_ADDR_V4MAPPED

	      IPv4 mapped address.

       IN6_IS_ADDR_V4COMPAT

	      IPv4-compatible address.

       IN6_IS_ADDR_MC_NODELOCAL

	      Multicast node-local address.

       IN6_IS_ADDR_MC_LINKLOCAL

	      Multicast link-local address.

       IN6_IS_ADDR_MC_SITELOCAL

	      Multicast site-local address.

       IN6_IS_ADDR_MC_ORGLOCAL

	      Multicast organization-local address.

       IN6_IS_ADDR_MC_GLOBAL

	      Multicast global address.

       The following sections are informative.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       Host   and  Network  Byte  Orders  ,  <arpa/inet.h>  ,  <inttypes.h>  ,
       <sys/socket.h> , the System Interfaces volume of	 IEEE Std 1003.1-2001,
       connect(), getsockopt(), htonl(), htons(), ntohl(), ntohs(), sendmsg(),
       sendto(), setsockopt()

COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),	The  Open  Group  Base
       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
       event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group  Standard
       is  the	referee document. The original Standard can be obtained online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group		     2003		     <netinet/in.h>(P)
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