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in.h

/* Copyright (C) 1991-1999, 2000, 2001 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#ifndef     _NETINET_IN_H
#define     _NETINET_IN_H     1

#include <features.h>
#include <stdint.h>
#include <bits/types.h>


__BEGIN_DECLS

/* Standard well-defined IP protocols.  */
enum
  {
    IPPROTO_IP = 0,        /* Dummy protocol for TCP.  */
#define IPPROTO_IP            IPPROTO_IP
    IPPROTO_HOPOPTS = 0,   /* IPv6 Hop-by-Hop options.  */
#define IPPROTO_HOPOPTS       IPPROTO_HOPOPTS
    IPPROTO_ICMP = 1,      /* Internet Control Message Protocol.  */
#define IPPROTO_ICMP          IPPROTO_ICMP
    IPPROTO_IGMP = 2,      /* Internet Group Management Protocol. */
#define IPPROTO_IGMP          IPPROTO_IGMP
    IPPROTO_IPIP = 4,      /* IPIP tunnels (older KA9Q tunnels use 94).  */
#define IPPROTO_IPIP          IPPROTO_IPIP
    IPPROTO_TCP = 6,       /* Transmission Control Protocol.  */
#define IPPROTO_TCP           IPPROTO_TCP
    IPPROTO_EGP = 8,       /* Exterior Gateway Protocol.  */
#define IPPROTO_EGP           IPPROTO_EGP
    IPPROTO_PUP = 12,      /* PUP protocol.  */
#define IPPROTO_PUP           IPPROTO_PUP
    IPPROTO_UDP = 17,      /* User Datagram Protocol.  */
#define IPPROTO_UDP           IPPROTO_UDP
    IPPROTO_IDP = 22,      /* XNS IDP protocol.  */
#define IPPROTO_IDP           IPPROTO_IDP
    IPPROTO_TP = 29,       /* SO Transport Protocol Class 4.  */
#define IPPROTO_TP            IPPROTO_TP
    IPPROTO_IPV6 = 41,     /* IPv6 header.  */
#define IPPROTO_IPV6          IPPROTO_IPV6
    IPPROTO_ROUTING = 43,  /* IPv6 routing header.  */
#define IPPROTO_ROUTING       IPPROTO_ROUTING
    IPPROTO_FRAGMENT = 44, /* IPv6 fragmentation header.  */
#define IPPROTO_FRAGMENT      IPPROTO_FRAGMENT
    IPPROTO_RSVP = 46,     /* Reservation Protocol.  */
#define IPPROTO_RSVP          IPPROTO_RSVP
    IPPROTO_GRE = 47,      /* General Routing Encapsulation.  */
#define IPPROTO_GRE           IPPROTO_GRE
    IPPROTO_ESP = 50,      /* encapsulating security payload.  */
#define IPPROTO_ESP           IPPROTO_ESP
    IPPROTO_AH = 51,       /* authentication header.  */
#define IPPROTO_AH            IPPROTO_AH
    IPPROTO_ICMPV6 = 58,   /* ICMPv6.  */
#define IPPROTO_ICMPV6        IPPROTO_ICMPV6
    IPPROTO_NONE = 59,     /* IPv6 no next header.  */
#define IPPROTO_NONE          IPPROTO_NONE
    IPPROTO_DSTOPTS = 60,  /* IPv6 destination options.  */
#define IPPROTO_DSTOPTS       IPPROTO_DSTOPTS
    IPPROTO_MTP = 92,      /* Multicast Transport Protocol.  */
#define IPPROTO_MTP           IPPROTO_MTP
    IPPROTO_ENCAP = 98,    /* Encapsulation Header.  */
#define IPPROTO_ENCAP         IPPROTO_ENCAP
    IPPROTO_PIM = 103,     /* Protocol Independent Multicast.  */
#define IPPROTO_PIM           IPPROTO_PIM
    IPPROTO_COMP = 108,    /* Compression Header Protocol.  */
#define IPPROTO_COMP          IPPROTO_COMP
    IPPROTO_RAW = 255,     /* Raw IP packets.  */
#define IPPROTO_RAW           IPPROTO_RAW
    IPPROTO_MAX
  };


/* Type to represent a port.  */
typedef uint16_t in_port_t;

/* Standard well-known ports.  */
enum
  {
    IPPORT_ECHO = 7,          /* Echo service.  */
    IPPORT_DISCARD = 9,       /* Discard transmissions service.  */
    IPPORT_SYSTAT = 11,       /* System status service.  */
    IPPORT_DAYTIME = 13,      /* Time of day service.  */
    IPPORT_NETSTAT = 15,      /* Network status service.  */
    IPPORT_FTP = 21,          /* File Transfer Protocol.  */
    IPPORT_TELNET = 23,       /* Telnet protocol.  */
    IPPORT_SMTP = 25,         /* Simple Mail Transfer Protocol.  */
    IPPORT_TIMESERVER = 37,   /* Timeserver service.  */
    IPPORT_NAMESERVER = 42,   /* Domain Name Service.  */
    IPPORT_WHOIS = 43,        /* Internet Whois service.  */
    IPPORT_MTP = 57,

    IPPORT_TFTP = 69,         /* Trivial File Transfer Protocol.  */
    IPPORT_RJE = 77,
    IPPORT_FINGER = 79,       /* Finger service.  */
    IPPORT_TTYLINK = 87,
    IPPORT_SUPDUP = 95,       /* SUPDUP protocol.  */


    IPPORT_EXECSERVER = 512,  /* execd service.  */
    IPPORT_LOGINSERVER = 513, /* rlogind service.  */
    IPPORT_CMDSERVER = 514,
    IPPORT_EFSSERVER = 520,

    /* UDP ports.  */
    IPPORT_BIFFUDP = 512,
    IPPORT_WHOSERVER = 513,
    IPPORT_ROUTESERVER = 520,

    /* Ports less than this value are reserved for privileged processes.  */
    IPPORT_RESERVED = 1024,

    /* Ports greater this value are reserved for (non-privileged) servers.  */
    IPPORT_USERRESERVED = 5000
  };


/* Internet address.  */
typedef uint32_t in_addr_t;
struct in_addr
  {
    in_addr_t s_addr;
  };


/* Definitions of the bits in an Internet address integer.

   On subnets, host and network parts are found according to
   the subnet mask, not these masks.  */

#define     IN_CLASSA(a)            ((((in_addr_t)(a)) & 0x80000000) == 0)
#define     IN_CLASSA_NET           0xff000000
#define     IN_CLASSA_NSHIFT  24
#define     IN_CLASSA_HOST          (0xffffffff & ~IN_CLASSA_NET)
#define     IN_CLASSA_MAX           128

#define     IN_CLASSB(a)            ((((in_addr_t)(a)) & 0xc0000000) == 0x80000000)
#define     IN_CLASSB_NET           0xffff0000
#define     IN_CLASSB_NSHIFT  16
#define     IN_CLASSB_HOST          (0xffffffff & ~IN_CLASSB_NET)
#define     IN_CLASSB_MAX           65536

#define     IN_CLASSC(a)            ((((in_addr_t)(a)) & 0xe0000000) == 0xc0000000)
#define     IN_CLASSC_NET           0xffffff00
#define     IN_CLASSC_NSHIFT  8
#define     IN_CLASSC_HOST          (0xffffffff & ~IN_CLASSC_NET)

#define     IN_CLASSD(a)            ((((in_addr_t)(a)) & 0xf0000000) == 0xe0000000)
#define     IN_MULTICAST(a)         IN_CLASSD(a)

#define     IN_EXPERIMENTAL(a)      ((((in_addr_t)(a)) & 0xe0000000) == 0xe0000000)
#define     IN_BADCLASS(a)          ((((in_addr_t)(a)) & 0xf0000000) == 0xf0000000)

/* Address to accept any incoming messages.  */
#define     INADDR_ANY        ((in_addr_t) 0x00000000)
/* Address to send to all hosts.  */
#define     INADDR_BROADCAST  ((in_addr_t) 0xffffffff)
/* Address indicating an error return.  */
#define     INADDR_NONE       ((in_addr_t) 0xffffffff)

/* Network number for local host loopback.  */
#define     IN_LOOPBACKNET          127
/* Address to loopback in software to local host.  */
#ifndef INADDR_LOOPBACK
# define INADDR_LOOPBACK      ((in_addr_t) 0x7f000001) /* Inet 127.0.0.1.  */
#endif

/* Defines for Multicast INADDR.  */
#define INADDR_UNSPEC_GROUP   ((in_addr_t) 0xe0000000) /* 224.0.0.0 */
#define INADDR_ALLHOSTS_GROUP ((in_addr_t) 0xe0000001) /* 224.0.0.1 */
#define INADDR_ALLRTRS_GROUP    ((in_addr_t) 0xe0000002) /* 224.0.0.2 */
#define INADDR_MAX_LOCAL_GROUP  ((in_addr_t) 0xe00000ff) /* 224.0.0.255 */


/* IPv6 address */
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
  };

extern const struct in6_addr in6addr_any;        /* :: */
extern const struct in6_addr in6addr_loopback;   /* ::1 */
#define IN6ADDR_ANY_INIT { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } } }
#define IN6ADDR_LOOPBACK_INIT { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 } } }

#define INET_ADDRSTRLEN 16
#define INET6_ADDRSTRLEN 46

/* Get the definition of the macro to define the common sockaddr members.  */
#include <bits/socket.h>


/* Structure describing an Internet socket address.  */
struct sockaddr_in
  {
    __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 */
  };

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

    /* local interface */
    unsigned int ipv6mr_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 */
  };

__END_DECLS

#endif      /* netinet/in.h */

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