in.h

Main socket header.

See also

The Open Group Base Specifications Issue 7, <netinet/in.h>

IN6_IS_ADDR_UNSPECIFIED( addr)

Check if address is the unspecified address (::). 

1
((int)(ipv6_addr_is_unspecified((const ipv6_addr_t *)(addr))))

Parameters

addr:address of type const struct in6_addr *

Return values

  • 0, when an address is not the unspecified address.
  • any other value otherwise.
IN6_IS_ADDR_LOOPBACK( addr)

Check if address is the loopback address (::1). 

1
((int)(ipv6_addr_is_loopback((const ipv6_addr_t *)(addr))))

Parameters

addr:address of type const struct in6_addr *

Return values

  • 0, when an address is not the loopback address.
  • any other value otherwise.
IN6_IS_ADDR_MULTICAST( addr)

Check if address is a multicast address. 

1
((int)(ipv6_addr_is_multicast((const ipv6_addr_t *)(addr))))

Parameters

addr:address of type const struct in6_addr *

Return values

  • 0, when an address is not a multicast address.
  • any other value otherwise.
IN6_IS_ADDR_LINKLOCAL( addr)

Check if address is a link-local address. 

1
((int)(ipv6_addr_is_link_local((const ipv6_addr_t *)addr)))

Parameters

addr:address of type const struct in6_addr *

Return values

  • 0, when an address is not a link-local address.
  • any other value otherwise.
IN6_IS_ADDR_SITELOCAL( addr)

Check if address is a site-local address. 

1
((int)(ipv6_addr_is_site_local((const ipv6_addr_t *)addr)))

Parameters

addr:address of type const struct in6_addr *

Return values

  • 0, when an address is not a site-local address.
  • any other value otherwise.
IN6_IS_ADDR_V4MAPPED( addr)

Check if address is an IPv4 mapped address. 

1
((int)(ipv6_addr_is_ipv4_mapped((const ipv6_addr_t *)addr)))

Parameters

addr:address of type const struct in6_addr *

Return values

  • 0, when an address is not an IPv4 mapped address.
  • any other value otherwise.
IN6_IS_ADDR_V4COMPAT( addr)

Check if address is an IPv4-compatible address. 

1
((int)(ipv6_addr_is_ipv4_compat((const ipv6_addr_t *)addr)))

Parameters

addr:address of type const struct in6_addr *

Return values

  • 0, when an address is not an IPv4-compatible address.
  • any other value otherwise.
IN6_IS_ADDR_MC_NODELOCAL( addr)

Check if address is a multicast node-local address. 

1
2
(IN6_IS_ADDR_MULTICAST(addr) && \
        (int)((addr->s6_addr[1] & 0x0f) == IPV6_ADDR_MCAST_SCP_IF_LOCAL))

Parameters

addr:address of type const struct in6_addr *

Return values

  • 0, when an address is not a multicast node-local address.
  • any other value otherwise.
IN6_IS_ADDR_MC_LINKLOCAL( addr)

Check if address is a multicast link-local address. 

1
2
(IN6_IS_ADDR_MULTICAST(addr) && \
        (int)((addr->s6_addr[1] & 0x0f) == IPV6_ADDR_MCAST_SCP_LINK_LOCAL))

Parameters

addr:address of type const struct in6_addr *

Return values

  • 0, when an address is not a multicast link-local address.
  • any other value otherwise.
IN6_IS_ADDR_MC_SITELOCAL( addr)

Check if address is a multicast site-local address. 

1
2
(IN6_IS_ADDR_MULTICAST(addr) && \
        (int)((addr->s6_addr[1] & 0x0f) == IPV6_ADDR_MCAST_SCP_SITE_LOCAL))

Parameters

addr:address of type const struct in6_addr *

Return values

  • 0, when an address is not a multicast site-local address.
  • any other value otherwise.
IN6_IS_ADDR_MC_ORGLOCAL( addr)

Check if address is a multicast organization-local address. 

1
2
(IN6_IS_ADDR_MULTICAST(addr) && \
        (int)((addr->s6_addr[1] & 0x0f) == IPV6_ADDR_MCAST_SCP_ORG_LOCAL))

Parameters

addr:address of type const struct in6_addr *

Return values

  • 0, when an address is not a multicast organization-local address.
  • any other value otherwise.
IN6_IS_ADDR_MC_GLOBAL( addr)

Check if address is a multicast global address. 

1
2
(IN6_IS_ADDR_MULTICAST(addr) && \
        (int)((addr->s6_addr[1] & 0x0f) == IPV6_ADDR_MCAST_SCP_GLOBAL))

Parameters

addr:address of type const struct in6_addr *

Return values

  • 0, when an address is not a multicast global address.
  • any other value otherwise.
IPPROTO_IP

Internet Protocol version 4. 

1
(PROTNUM_IPV4)
IPPROTO_IPV6

Internet Protocol version 6. 

1
(PROTNUM_IPV6)
IPPROTO_ICMP

Internet Control Message Protocol. 

1
(PROTNUM_ICMP)
IPPROTO_ICMPV6

ICMP for IPv6. 

1
(PROTNUM_ICMPV6)
IPPROTO_RAW

Raw IP packets protocol. 

1
(PROTNUM_RESERVED)
IPPROTO_TCP

Transmission control protocol. 

1
(PROTNUM_TCP)
IPPROTO_UDP

User datagram protocol. 

1
(PROTNUM_UDP)
INET_ADDRSTRLEN

Length of the string form for IPv4. 

1
(16)
INET6_ADDRSTRLEN

Length of the string form for IPv6. 

1
(46)
INADDR_ANY

IPv4 local host address. 

1
((in_addr_t)0x00000000)
INADDR_BROADCAST

IPv4 broadcast address. 

1
((in_addr_t)0xffffffff)
IN6ADDR_ANY_INIT

IPv6 wildcard address. 

1
IPV6_ADDR_UNSPECIFIED
IN6ADDR_LOOPBACK_INIT

IPv6 loopback address. 

1
IPV6_ADDR_LOOPBACK
uint16_t in_port_t

Internet port type.

IPv6 option names

uint32_t in_addr_t

IPv4 address type.

const struct in6_addr in6addr_any

IPv6 socket address for the wildcard address.

const struct in6_addr in6addr_loopback

IPv6 socket address for the loopback address.

struct in_addr

IPv4 address structure type.

in.h::in_addr_t s_addr

an IPv4 address

struct in6_addr

IPv6 address structure type.

uint8_t s6_addr()

unsigned 8-bit integer array

struct sockaddr_in

IPv4 socket address type.

sockaddr

socket.h::sa_family_t sin_family

Protocol family, always AF_INET.

in.h::in_port_t sin_port

Port number.

struct in_addr sin_addr

IPv4 address.

struct sockaddr_in6

IPv6 socket address type.

sockaddr

socket.h::sa_family_t sin6_family

Protocol family, always AF_INET6.

Member of struct sockaddr_in6Protocol family, always AF_INET6

in.h::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.

struct ipv6_mreq

IPv6 multicast request.

struct in6_addr ipv6mr_multiaddr

an IPv6 multicast address

unsigned ipv6mr_interface

interface index, leave 0 for default