in.h

Host Identity Protocol on Linux is an implemetation of the Host Identity Protocol (HIP) and the rela

    __SOCKADDR_COMMON (sin_);
    in_port_t sin_port;			/* Port number.  */
    struct in_addr sin_addr;		/* Internet address.  */

    /* Pad to size of `struct sockaddr'.  */
    unsigned char sin_zero[sizeof (struct sockaddr) -
			   __SOCKADDR_COMMON_SIZE -
			   sizeof (in_port_t) -
			   sizeof (struct in_addr)];
  };

/* Ditto, for IPv6.  */
struct sockaddr_in6
  {
    __SOCKADDR_COMMON (sin6_);
    in_port_t sin6_port;	/* Transport layer port # */
    uint32_t sin6_flowinfo;	/* IPv6 flow information */
    struct in6_addr sin6_addr;	/* IPv6 address */
    uint32_t sin6_scope_id;	/* IPv6 scope-id */
  };

#ifdef __USE_GNU
struct __sockaddr_in6_rfc2133
  {
    __SOCKADDR_COMMON (sin6_);
    in_port_t sin6_port;	/* Transport layer port # */
    uint32_t sin6_flowinfo;	/* IPv6 flow information */
    struct in6_addr sin6_addr;	/* IPv6 address */
  };
#endif

/* IPv6 multicast request.  */
struct ipv6_mreq
  {
    /* IPv6 multicast address of group */
    struct in6_addr ipv6mr_multiaddr;

    /* local interface */
    unsigned int ipv6mr_interface;
  };

/* IPv6 anycast request.  */
struct ipv6_areq
  {
    /* IPv6 anycast address of group */
    struct in6_addr ipv6ar_anyaddr;

    /* local interface */
    unsigned int ipv6ar_interface;
  };

/* Get system-specific definitions.  */
#include <bits/in.h>

/* Functions to convert between host and network byte order.

   Please note that these functions normally take `unsigned long int' or
   `unsigned short int' values as arguments and also return them.  But
   this was a short-sighted decision since on different systems the types
   may have different representations but the values are always the same.  */

extern uint32_t ntohl (uint32_t __netlong) __THROW __attribute__ ((__const__));
extern uint16_t ntohs (uint16_t __netshort)
     __THROW __attribute__ ((__const__));
extern uint32_t htonl (uint32_t __hostlong)
     __THROW __attribute__ ((__const__));
extern uint16_t htons (uint16_t __hostshort)
     __THROW __attribute__ ((__const__));

#include <endian.h>

/* Get machine dependent optimized versions of byte swapping functions.  */
#include <bits/byteswap.h>

#ifdef __OPTIMIZE__
/* We can optimize calls to the conversion functions.  Either nothing has
   to be done or we are using directly the byte-swapping functions which
   often can be inlined.  */
# if __BYTE_ORDER == __BIG_ENDIAN
/* The host byte order is the same as network byte order,
   so these functions are all just identity.  */
# define ntohl(x)	(x)
# define ntohs(x)	(x)
# define htonl(x)	(x)
# define htons(x)	(x)
# else
#  if __BYTE_ORDER == __LITTLE_ENDIAN
#   define ntohl(x)	__bswap_32 (x)
#   define ntohs(x)	__bswap_16 (x)
#   define htonl(x)	__bswap_32 (x)
#   define htons(x)	__bswap_16 (x)
#  endif
# endif
#endif

#define IN6_IS_ADDR_UNSPECIFIED(a) \
	(((__const uint32_t *) (a))[0] == 0				      \
	 && ((__const uint32_t *) (a))[1] == 0				      \
	 && ((__const uint32_t *) (a))[2] == 0				      \
	 && ((__const uint32_t *) (a))[3] == 0)

#define IN6_IS_ADDR_LOOPBACK(a) \
	(((__const uint32_t *) (a))[0] == 0				      \
	 && ((__const uint32_t *) (a))[1] == 0				      \
	 && ((__const uint32_t *) (a))[2] == 0				      \
	 && ((__const uint32_t *) (a))[3] == htonl (1))

#define IN6_IS_ADDR_MULTICAST(a) (((__const uint8_t *) (a))[0] == 0xff)

#define IN6_IS_ADDR_LINKLOCAL(a) \
	((((__const uint32_t *) (a))[0] & htonl (0xffc00000))		      \
	 == htonl (0xfe800000))

#define IN6_IS_ADDR_SITELOCAL(a) \
	((((__const uint32_t *) (a))[0] & htonl (0xffc00000))		      \
	 == htonl (0xfec00000))

#define IN6_IS_ADDR_V4MAPPED(a) \
	((((__const uint32_t *) (a))[0] == 0)				      \
	 && (((__const uint32_t *) (a))[1] == 0)			      \
	 && (((__const uint32_t *) (a))[2] == htonl (0xffff)))

#define IN6_IS_ADDR_V4COMPAT(a) \
	((((__const uint32_t *) (a))[0] == 0)				      \
	 && (((__const uint32_t *) (a))[1] == 0)			      \
	 && (((__const uint32_t *) (a))[2] == 0)			      \
	 && (ntohl (((__const uint32_t *) (a))[3]) > 1))

#define IN6_ARE_ADDR_EQUAL(a,b) \
	((((__const uint32_t *) (a))[0] == ((__const uint32_t *) (b))[0])     \
	 && (((__const uint32_t *) (a))[1] == ((__const uint32_t *) (b))[1])  \
	 && (((__const uint32_t *) (a))[2] == ((__const uint32_t *) (b))[2])  \
	 && (((__const uint32_t *) (a))[3] == ((__const uint32_t *) (b))[3]))

/* Bind socket to a privileged IP port.  */
extern int bindresvport (int __sockfd, struct sockaddr_in *__sock_in) __THROW;

/* The IPv6 version of this function.  */
extern int bindresvport6 (int __sockfd, struct sockaddr_in6 *__sock_in)
     __THROW;


#define IN6_IS_ADDR_MC_NODELOCAL(a) \
	(IN6_IS_ADDR_MULTICAST(a)					      \
	 && ((((__const uint8_t *) (a))[1] & 0xf) == 0x1))

#define IN6_IS_ADDR_MC_LINKLOCAL(a) \
	(IN6_IS_ADDR_MULTICAST(a)					      \
	 && ((((__const uint8_t *) (a))[1] & 0xf) == 0x2))

#define IN6_IS_ADDR_MC_SITELOCAL(a) \
	(IN6_IS_ADDR_MULTICAST(a)					      \
	 && ((((__const uint8_t *) (a))[1] & 0xf) == 0x5))

#define IN6_IS_ADDR_MC_ORGLOCAL(a) \
	(IN6_IS_ADDR_MULTICAST(a)					      \
	 && ((((__const uint8_t *) (a))[1] & 0xf) == 0x8))

#define IN6_IS_ADDR_MC_GLOBAL(a) \
	(IN6_IS_ADDR_MULTICAST(a)					      \
	 && ((((__const uint8_t *) (a))[1] & 0xf) == 0xe))

/* IPv6 packet information.  */
struct in6_pktinfo
  {
    struct in6_addr	ipi6_addr;    /* src/dst IPv6 address */
    unsigned int	ipi6_ifindex; /* send/recv interface index */
  };

/* RFC2292 / RFC2292bis things */
#define IPV6_RTHDR_LOOSE     0 /* this hop need not be a neighbor. XXX old spec */
#define IPV6_RTHDR_STRICT    1 /* this hop must be a neighbor. XXX old spec */
#define IPV6_RTHDR_TYPE_0    0 /* IPv6 routing header type 0 */

struct cmsghdr;
extern int inet6_option_space (int _nbytes) __THROW;
extern int inet6_option_init (void *__bp, struct cmsghdr **__cmsgp, int __type) __THROW;
extern int inet6_option_append (struct cmsghdr *__cmsg, const uint8_t *typep,
				int __multx, int __plusy) __THROW;
extern uint8_t *inet6_option_alloc (struct cmsghdr *__cmsg, int __datalen, 
				    int __multx, int __plusy) __THROW;
extern int inet6_option_next (const struct cmsghdr *__cmsg, uint8_t **__tptrp) __THROW;
extern int inet6_option_find (const struct cmsghdr *__cmsg, uint8_t **__tptrp, 
			      int __type) __THROW;

extern socklen_t inet6_rthdr_space (int __type, int __segments) __THROW;
extern struct cmsghdr *inet6_rthdr_init (void *__bp, int __type) __THROW;
extern int inet6_rthdr_add (struct cmsghdr *__cmsg, const struct in6_addr *__addr,
			    unsigned int __flags) __THROW;
extern int inet6_rthdr_lasthop (struct cmsghdr *__cmsg, unsigned int __flags) __THROW;
extern int inet6_rthdr_reverse (const struct cmsghdr *__in, struct cmsghdr *__out) __THROW;
extern int inet6_rthdr_segments (const struct cmsghdr *__cmsg) __THROW;
extern struct in6_addr *inet6_rthdr_getaddr (struct cmsghdr *__cmsg, int __index) __THROW;
extern int inet6_rthdr_getflags (const struct cmsghdr *__cmsg, int __index) __THROW;

#ifdef __USE_RFC3542
extern int inet6_opt_init (void *__extbuf, socklen_t __extlen) __THROW;
extern int inet6_opt_append (void *__extbuf, socklen_t __extlen, int __prevlen,
			     uint8_t __type, socklen_t __len, uint8_t __align,
			     void **__databufp) __THROW;
extern int inet6_opt_finish (void *__extbuf, socklen_t __extlen, int __prevlen) __THROW;
extern int inet6_opt_set_val (void *__extbuf, socklen_t __extlen, void *__val, int __vallen) __THROW;

extern int inet6_opt_next (void *__extbuf, socklen_t __extlen, int __prevlen, 
			   uint8_t *__typep, socklen_t *__lenp, void **__databufp) __THROW;
extern int inet6_opt_find (void *__extbuf, socklen_t __extlen, int __prevlen, 
			   uint8_t __type, socklen_t *__lenp, void **__databufp) __THROW;
extern int inet6_opt_get_val (void *__databuf, socklen_t __offset, void *__val, 
			      int __vallen) __THROW;
extern socklen_t inet6_rth_space (int __type, int __segments) __THROW;
extern void *inet6_rth_init (void *__bp, int __bp_len, int __type, int __segments) __THROW;
extern int inet6_rth_add (void *__bp, const struct in6_addr *__addr) __THROW;
extern int inet6_rth_reverse (const void *__in, void *__out) __THROW;
extern int inet6_rth_segments (const void *__bp) __THROW;
extern struct in6_addr *inet6_rth_getaddr (const void *__bp, int __index) __THROW;
#endif

__END_DECLS

#endif	/* netinet/in.h */