Definitions for the Internet address family. More...

#include <sys/cdefs.h>
#include <inttypes.h>
#include <sys/socket.h>
#include <arpa/inet.h>

Data Structures
struct	in_addr
	Structure used to store an IPv4 address. More...

struct	in6_addr
	Structure used to store an IPv6 address. More...

struct	sockaddr_in
	Structure used to store an IPv4 address for a socket. More...

struct	sockaddr_in6
	Structure used to store an IPv6 address for a socket. More...

Macros
#define	s6_addr __s6_addr.__s6_addr8

#define	INADDR_ANY 0x00000000
	Local IPv4 host address. More...

#define	INADDR_BROADCAST 0xFFFFFFFF
	IPv4 broadcast address. More...

#define	INADDR_NONE 0xFFFFFFFF
	IPv4 error address. More...

#define	IN6ADDR_ANY_INIT
	Initialize an IPv6 local host address. More...

#define	IN6ADDR_LOOPBACK_INIT
	Initialize an IPv6 loopback address. More...

#define	INET_ADDRSTRLEN 16
	Length of a string form of a maximal IPv4 address. More...

#define	INET6_ADDRSTRLEN 46
	Length of a string form of a maximal IPv6 address. More...

#define	IPPROTO_IP 0
	Internet Protocol Version 4. More...

#define	IPPROTO_ICMP 1
	Internet Control Message Protocol. More...

#define	IPPROTO_TCP 6
	Transmission Control Protocol. More...

#define	IPPROTO_UDP 17
	User Datagram Protocol. More...

#define	IPPROTO_IPV6 41
	Internet Protocol Version 6. More...

#define	IPPROTO_UDPLITE 136
	Lightweight User Datagram Protocol. More...

#define	IP_TTL 24
	TTL for unicast (get/set) More...

#define	IPV6_JOIN_GROUP 17
	Join a multicast group (set) More...

#define	IPV6_LEAVE_GROUP 18
	Leave a multicast group (set) More...

#define	IPV6_MULTICAST_HOPS 19
	Hop limit for multicast (get/set) More...

#define	IPV6_MULTICAST_IF 20
	Multicast interface (get/set) More...

#define	IPV6_MULTICAST_LOOP 21
	Multicasts loopback (get/set) More...

#define	IPV6_UNICAST_HOPS 22
	Hop limit for unicast (get/set) More...

#define	IPV6_V6ONLY 23
	IPv6 only – no IPv4 (get/set) More...

#define	UDP_NOCHECKSUM 25
	Don't calculate UDP checksums. More...

#define	UDPLITE_SEND_CSCOV 26
	Sending checksum coverage. More...

#define	UDPLITE_RECV_CSCOV 27
	Receiving checksum coverage. More...

#define	IN6_IS_ADDR_UNSPECIFIED(a)
	Test if an IPv6 Address is unspecified. More...

#define	IN6_IS_ADDR_LOOPBACK(a)
	Test if an IPv6 Address is a loopback address. More...

#define	IN6_IS_ADDR_V4MAPPED(a)
	Test if an IPv6 Address is an IPv4 mapped address. More...

#define	IN6_IS_ADDR_V4COMPAT(a)
	Test if an IPv6 Address is an IPv4 compatibility address. More...

#define	IN6_IS_ADDR_LINKLOCAL(a)
	Test if an IPv6 Address is a link-local address. More...

#define	IN6_IS_ADDR_SITELOCAL(a)
	Test if an IPv6 Address is a site-local address. More...

#define	IN6_IS_ADDR_MULTICAST(a) ((a)->__s6_addr.__s6_addr8[0] == 0xFF)
	Test if an IPv6 Address is a multicast address. More...

#define	IN6_IS_ADDR_MC_NODELOCAL(a)
	Test if an IPv6 Address is a node-local multicast address. More...

#define	IN6_IS_ADDR_MC_LINKLOCAL(a)
	Test if an IPv6 Address is a link-local multicast address. More...

#define	IN6_IS_ADDR_MC_SITELOCAL(a)
	Test if an IPv6 Address is a site-local multicast address. More...

#define	IN6_IS_ADDR_MC_ORGLOCAL(a)
	Test if an IPv6 Address is an organization-local multicast address. More...

#define	IN6_IS_ADDR_MC_GLOBAL(a)
	Test if an IPv6 Address is a global multicast address. More...

Typedefs
typedef uint16_t	in_port_t
	16-bit type used to store a value for an internet port. More...

typedef uint32_t	in_addr_t
	32-bit value used to store an IPv4 address. More...

Variables
const struct in6_addr	in6addr_any
	IPv6 local host address. More...

const struct in6_addr	in6addr_loopback
	IPv6 loopback address. More...

Detailed Description

Definitions for the Internet address family.

This file contains the standard definitions (as directed by the POSIX 2008 standard) for internet-related functionality in the AF_INET address family. This does is not guaranteed to have everything that one might have in a fully-standard compliant implementation of the POSIX standard.

Author: Lawrence Sebald

Macro Definition Documentation

#define IN6_IS_ADDR_LINKLOCAL ( a )

Value:

(((a)->__s6_addr.__s6_addr8[0] == 0xFE) && \

(((a)->__s6_addr.__s6_addr8[1] & 0xC0) == 0x80))

Test if an IPv6 Address is a link-local address.

This macro tests whether an IPv6 address (struct in6_addr *) is a link-local address.

Parameters

a	The address to test (struct in6_addr *)

Returns: Nonzero if the address is link-local, 0 otherwise.

#define IN6_IS_ADDR_LOOPBACK ( a )

Value:

((a)->__s6_addr.__s6_addr32[0] == 0 && \
     (a)->__s6_addr.__s6_addr32[1] == 0 && \
     (a)->__s6_addr.__s6_addr32[2] == 0 && \
     (a)->__s6_addr.__s6_addr16[6] == 0 && \
     (a)->__s6_addr.__s6_addr8[14] == 0 && \
     (a)->__s6_addr.__s6_addr8[15] == 1)

Test if an IPv6 Address is a loopback address.

This macro tests whether an IPv6 address (struct in6_addr *) is a loopback address.

Parameters

a	The address to test (struct in6_addr *)

Returns: Nonzero if the address is a loopback, 0 otherwise.

#define IN6_IS_ADDR_MC_GLOBAL ( a )

Value:

(IN6_IS_ADDR_MULTICAST(a) && \

(((a)->__s6_addr.__s6_addr8[1] & 0x0F) == 0x0E))

IN6_IS_ADDR_MULTICAST

#define IN6_IS_ADDR_MULTICAST(a)

Test if an IPv6 Address is a multicast address.

Definition: in.h:352

Test if an IPv6 Address is a global multicast address.

This macro tests whether an IPv6 address (struct in6_addr *) is a global multicast address.

Parameters

a	The address to test (struct in6_addr *)

Returns: Nonzero if the address is a global multicast address, 0 otherwise.

#define IN6_IS_ADDR_MC_LINKLOCAL ( a )

Value:

(IN6_IS_ADDR_MULTICAST(a) && \

(((a)->__s6_addr.__s6_addr8[1] & 0x0F) == 0x02))

IN6_IS_ADDR_MULTICAST

#define IN6_IS_ADDR_MULTICAST(a)

Test if an IPv6 Address is a multicast address.

Definition: in.h:352

Test if an IPv6 Address is a link-local multicast address.

This macro tests whether an IPv6 address (struct in6_addr *) is a link-local multicast address.

Parameters

a	The address to test (struct in6_addr *)

Returns: Nonzero if the address is a link-local multicast address, 0 otherwise.

#define IN6_IS_ADDR_MC_NODELOCAL ( a )

Value:

(IN6_IS_ADDR_MULTICAST(a) && \

(((a)->__s6_addr.__s6_addr8[1] & 0x0F) == 0x01))

IN6_IS_ADDR_MULTICAST

#define IN6_IS_ADDR_MULTICAST(a)

Test if an IPv6 Address is a multicast address.

Definition: in.h:352

Test if an IPv6 Address is a node-local multicast address.

This macro tests whether an IPv6 address (struct in6_addr *) is a node-local multicast address.

Parameters

a	The address to test (struct in6_addr *)

Returns: Nonzero if the address is a node-local multicast address, 0 otherwise.

#define IN6_IS_ADDR_MC_ORGLOCAL ( a )

Value:

(IN6_IS_ADDR_MULTICAST(a) && \

(((a)->__s6_addr.__s6_addr8[1] & 0x0F) == 0x08))

IN6_IS_ADDR_MULTICAST

#define IN6_IS_ADDR_MULTICAST(a)

Test if an IPv6 Address is a multicast address.

Definition: in.h:352

Test if an IPv6 Address is an organization-local multicast address.

This macro tests whether an IPv6 address (struct in6_addr *) is an organization-local multicast address.

Parameters

a	The address to test (struct in6_addr *)

Returns: Nonzero if the address is an organization-local multicast address, 0 otherwise.

#define IN6_IS_ADDR_MC_SITELOCAL ( a )

Value:

(IN6_IS_ADDR_MULTICAST(a) && \

(((a)->__s6_addr.__s6_addr8[1] & 0x0F) == 0x05))

IN6_IS_ADDR_MULTICAST

#define IN6_IS_ADDR_MULTICAST(a)

Test if an IPv6 Address is a multicast address.

Definition: in.h:352

Test if an IPv6 Address is a site-local multicast address.

This macro tests whether an IPv6 address (struct in6_addr *) is a site-local multicast address.

Parameters

a	The address to test (struct in6_addr *)

Returns: Nonzero if the address is a site-local multicast address, 0 otherwise.

#define IN6_IS_ADDR_MULTICAST ( a ) ((a)->__s6_addr.__s6_addr8[0] == 0xFF)

Test if an IPv6 Address is a multicast address.

This macro tests whether an IPv6 address (struct in6_addr *) is a multicast address.

Parameters

a	The address to test (struct in6_addr *)

Returns: Nonzero if the address is multicast, 0 otherwise.

#define IN6_IS_ADDR_SITELOCAL ( a )

Value:

(((a)->__s6_addr.__s6_addr8[0] == 0xFE) && \

(((a)->__s6_addr.__s6_addr8[1] & 0xC0) == 0xC0))

Test if an IPv6 Address is a site-local address.

This macro tests whether an IPv6 address (struct in6_addr *) is a site-local address.

Parameters

a	The address to test (struct in6_addr *)

Returns: Nonzero if the address is site-local, 0 otherwise.

#define IN6_IS_ADDR_UNSPECIFIED ( a )

Value:

((a)->__s6_addr.__s6_addr32[0] == 0 && \
     (a)->__s6_addr.__s6_addr32[1] == 0 && \
     (a)->__s6_addr.__s6_addr32[2] == 0 && \
     (a)->__s6_addr.__s6_addr32[3] == 0)

Test if an IPv6 Address is unspecified.

This macro tests whether an IPv6 address (struct in6_addr *) is an unspecified address.

Parameters

a	The address to test (struct in6_addr *)

Returns: Nonzero if the address is unspecified, 0 otherwise.

#define IN6_IS_ADDR_V4COMPAT ( a )

Value:

((a)->__s6_addr.__s6_addr32[0] == 0 && \
     (a)->__s6_addr.__s6_addr32[1] == 0 && \
     (a)->__s6_addr.__s6_addr32[2] == 0 && \
     (a)->__s6_addr.__s6_addr32[3] != 0 && \
     (a)->__s6_addr.__s6_addr8[15] != 1)

Test if an IPv6 Address is an IPv4 compatibility address.

This macro tests whether an IPv6 address (struct in6_addr *) is an IPv4 compatibility address.

Parameters

a	The address to test (struct in6_addr *)

Returns: Nonzero if the address is IPv4 compat, 0 otherwise.

#define IN6_IS_ADDR_V4MAPPED ( a )

Value:

((a)->__s6_addr.__s6_addr32[0] == 0 &&      \
     (a)->__s6_addr.__s6_addr32[1] == 0 &&      \
     (a)->__s6_addr.__s6_addr16[4] == 0 &&      \
     (a)->__s6_addr.__s6_addr16[5] == 0xFFFF)

Test if an IPv6 Address is an IPv4 mapped address.

This macro tests whether an IPv6 address (struct in6_addr *) is an IPv4 mapped address.

Parameters

a	The address to test (struct in6_addr *)

Returns: Nonzero if the address is IPv4 mapped, 0 otherwise.

#define IN6ADDR_ANY_INIT

Value:

{{{ 0, 0, 0, 0, 0, 0, 0, 0, \

0, 0, 0, 0, 0, 0, 0, 0 }}}

Initialize an IPv6 local host address.

This macro can be used to initialize a struct in6_addr to any local address. It functions similarly to INADDR_ANY for IPv4.

#define IN6ADDR_LOOPBACK_INIT

Value:

{{{ 0, 0, 0, 0, 0, 0, 0, 0, \

0, 0, 0, 0, 0, 0, 0, 1 }}}

Initialize an IPv6 loopback address.

This macro can be used to initialize a struct in6_addr to the loopback address.

#define INADDR_ANY 0x00000000

Local IPv4 host address.

This address can be used by many things if you prefer to not specify the local address, and would rather it be detected automatically.

#define INADDR_BROADCAST 0xFFFFFFFF

IPv4 broadcast address.

This address is the normal IPv4 broadcast address (255.255.255.255).

#define INADDR_NONE 0xFFFFFFFF

IPv4 error address.

This address is non-standard, but is available on many systems. It is used to detect failure from some functions that normally return addresses (such as the inet_addr function).

#define INET6_ADDRSTRLEN 46

Length of a string form of a maximal IPv6 address.

#define INET_ADDRSTRLEN 16

Length of a string form of a maximal IPv4 address.

#define IPPROTO_ICMP 1

Internet Control Message Protocol.

#define IPPROTO_IP 0

Internet Protocol Version 4.

#define IPPROTO_IPV6 41

Internet Protocol Version 6.

#define IPPROTO_TCP 6

Transmission Control Protocol.

#define IPPROTO_UDP 17

User Datagram Protocol.

#define IPPROTO_UDPLITE 136

Lightweight User Datagram Protocol.

#define s6_addr __s6_addr.__s6_addr8

Typedef Documentation

typedef uint32_t in_addr_t

32-bit value used to store an IPv4 address.

typedef uint16_t in_port_t

16-bit type used to store a value for an internet port.

Variable Documentation

const struct in6_addr in6addr_any

IPv6 local host address.

This constant variable contains the IPv6 local host address.

const struct in6_addr in6addr_loopback

IPv6 loopback address.

This constant variable contains the IPv6 loopback address.

Data Structures

Macros

Typedefs

Variables

Detailed Description

Macro Definition Documentation

Typedef Documentation

Variable Documentation