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netinet_in.h(0P)	   POSIX Programmer's Manual	      netinet_in.h(0P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

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 described in <inttypes.h>.

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

       The  <netinet_in.h>  header  shall  define  the	sa_family_t  type   as
       described in <sys/socket.h>.

       The  <netinet_in.h>  header shall define the uint8_t and uint32_t types
       as described in <inttypes.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, which
       shall include at least the following member:

	   in_addr_t  s_addr

       The <netinet/in.h> header shall define the sockaddr_in structure, which
       shall include at least the following members:

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

       The sin_port and sin_addr members shall be in network byte order.

       The  sockaddr_in	 structure is used to store addresses for the Internet
       address family.	Pointers to 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, which
       shall include 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,
       which shall include at least the following members:

	   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 sin6_port and sin6_addr members shall be in network byte order.

       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,	 which
       shall include 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 symbolic constants
       for use as values of the level argument of  getsockopt()	 and  setsock‐
       opt():

       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 symbolic constants
       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 symbolic constant,
       with the value specified, 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 described 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 symbolic constant,
       with the value specified, 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 symbolic con‐
       stants, with distinct integer values, for use in the option_name	 argu‐
       ment  in	 the  getsockopt() 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
       Section 4.9, Host and Network Byte Orders, <arpa_inet.h>, <inttypes.h>,
       <sys_socket.h>

       The System Interfaces volume of POSIX.1‐2008, connect(),	 getsockopt(),
       htonl(), sendmsg(), sendto(), setsockopt()

COPYRIGHT
       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
       cal  and	 Electronics  Engineers,  Inc  and  The	 Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum	 1  applied.)  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.unix.org/online.html .

       Any typographical or formatting errors that appear  in  this  page  are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors,	 see  https://www.ker‐
       nel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group		     2013		      netinet_in.h(0P)
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