in.h

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#ifndef _IPXE_IN_H
#define _IPXE_IN_H

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );

#include <stdint.h>
#include <byteswap.h>
#include <ipxe/socket.h>

/* Protocol numbers */

#define IP_ICMP         1
#define IP_TCP          6
#define IP_UDP          17
#define IP_ICMP6        58

/* IP address constants */

#define INADDR_NONE             htonl ( 0xffffffff )

#define INADDR_BROADCAST        htonl ( 0xffffffff )

#define INADDR_NET_CLASSA       htonl ( 0xff000000 )
#define INADDR_NET_CLASSB       htonl ( 0xffff0000 )
#define INADDR_NET_CLASSC       htonl ( 0xffffff00 )

#define IN_IS_CLASSA( addr ) \
        ( ( (addr) & htonl ( 0x80000000 ) ) == htonl ( 0x00000000 ) )
#define IN_IS_CLASSB( addr ) \
        ( ( (addr) & htonl ( 0xc0000000 ) ) == htonl ( 0x80000000 ) )
#define IN_IS_CLASSC( addr ) \
        ( ( (addr) & htonl ( 0xe0000000 ) ) == htonl ( 0xc0000000 ) )
#define IN_IS_MULTICAST( addr ) \
        ( ( (addr) & htonl ( 0xf0000000 ) ) == htonl ( 0xe0000000 ) )

#define IN_IS_SMALL( mask ) ( (mask) & htonl ( 0x00000003 ) )

/**
 * IP address structure
 */
struct in_addr {
        uint32_t        s_addr;
};

typedef struct in_addr in_addr;

/**
 * IP6 address structure
 */
struct in6_addr {
        union {
                uint8_t u6_addr8[16];
                uint16_t u6_addr16[8];
                uint32_t u6_addr32[4];
        } in6_u;
#define s6_addr         in6_u.u6_addr8
#define s6_addr16       in6_u.u6_addr16
#define s6_addr32       in6_u.u6_addr32
};

#define IN6_IS_ADDR_UNSPECIFIED( addr )                                 \
        ( ( ( ( ( const uint32_t * ) (addr) )[0] ) |                    \
            ( ( ( const uint32_t * ) (addr) )[1] ) |                    \
            ( ( ( const uint32_t * ) (addr) )[2] ) |                    \
            ( ( ( const uint32_t * ) (addr) )[3] ) ) == 0 )

#define IN6_IS_ADDR_MULTICAST( addr )                                   \
        ( *( ( const uint8_t * ) (addr) ) == 0xff )

#define IN6_IS_ADDR_LINKLOCAL( addr )                                   \
        ( ( *( ( const uint16_t * ) (addr) ) & htons ( 0xffc0 ) ) ==    \
          htons ( 0xfe80 ) )

#define IN6_IS_ADDR_SITELOCAL( addr )                                   \
        ( ( *( ( const uint16_t * ) (addr) ) & htons ( 0xffc0 ) ) ==    \
          htons ( 0xfec0 ) )

#define IN6_IS_ADDR_ULA( addr )                                         \
        ( ( *( ( const uint8_t * ) (addr) ) & 0xfe ) == 0xfc )

/**
 * IPv4 socket address
 */
struct sockaddr_in {
        /** Socket address family (part of struct @c sockaddr)
         *
         * Always set to @c AF_INET for IPv4 addresses
         */
        sa_family_t sin_family;
        /** Flags (part of struct @c sockaddr_tcpip) */
        uint16_t sin_flags;
        /** TCP/IP port (part of struct @c sockaddr_tcpip) */
        uint16_t sin_port;
        /** Scope ID (part of struct @c sockaddr_tcpip)
         *
         * For multicast addresses, this is the network device index.
         */
        uint16_t sin_scope_id;
        /** IPv4 address */
        struct in_addr sin_addr;
        /** Padding
         *
         * This ensures that a struct @c sockaddr_in is large enough
         * to hold a socket address for any TCP/IP address family.
         */
        char pad[ sizeof ( struct sockaddr ) -
                  ( sizeof ( sa_family_t ) /* sin_family */ +
                    sizeof ( uint16_t ) /* sin_flags */ +
                    sizeof ( uint16_t ) /* sin_port */ +
                    sizeof ( uint16_t ) /* sin_scope_id */ +
                    sizeof ( struct in_addr ) /* sin_addr */ ) ];
} __attribute__ (( packed, may_alias ));

/**
 * IPv6 socket address
 */
struct sockaddr_in6 {
        /** Socket address family (part of struct @c sockaddr)
         *
         * Always set to @c AF_INET6 for IPv6 addresses
         */
        sa_family_t sin6_family;
        /** Flags (part of struct @c sockaddr_tcpip) */
        uint16_t sin6_flags;
        /** TCP/IP port (part of struct @c sockaddr_tcpip) */
        uint16_t sin6_port;
        /** Scope ID (part of struct @c sockaddr_tcpip)
         *
         * For link-local or multicast addresses, this is the network
         * device index.
         */
        uint16_t sin6_scope_id;
        /** IPv6 address */
        struct in6_addr sin6_addr;
        /** Padding
         *
         * This ensures that a struct @c sockaddr_in6 is large
         * enough to hold a socket address for any TCP/IP address
         * family.
         */
        char pad[ sizeof ( struct sockaddr ) -
                  ( sizeof ( sa_family_t ) /* sin6_family */ +
                    sizeof ( uint16_t ) /* sin6_flags */ +
                    sizeof ( uint16_t ) /* sin6_port */ +
                    sizeof ( uint16_t ) /* sin6_scope_id */ +
                    sizeof ( struct in6_addr ) /* sin6_addr */ ) ];
} __attribute__ (( packed, may_alias ));

extern int inet_aton ( const char *cp, struct in_addr *inp );
extern char * inet_ntoa ( struct in_addr in );
extern int inet6_aton ( const char *string, struct in6_addr *in );
extern char * inet6_ntoa ( const struct in6_addr *in );

#endif  /* _IPXE_IN_H */