in.h

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/*
 * INET         An implementation of the TCP/IP protocol suite for the LINUX
 *              operating system.  INET is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              Definitions of the Internet Protocol.
 *
 * Version:     @(#)in.h        1.0.1   04/21/93
 *
 * Authors:     Original taken from the GNU Project <netinet/in.h> file.
 *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 */
#ifndef _LINUX_IN_H
#define _LINUX_IN_H

#include <linux/types.h>

/* Standard well-defined IP protocols.  */
enum {
  IPPROTO_IP = 0,               /* Dummy protocol for TCP               */
  IPPROTO_ICMP = 1,             /* Internet Control Message Protocol    */
  IPPROTO_IGMP = 2,             /* Internet Group Management Protocol   */
  IPPROTO_IPIP = 4,             /* IPIP tunnels (older KA9Q tunnels use 94) */
  IPPROTO_TCP = 6,              /* Transmission Control Protocol        */
  IPPROTO_EGP = 8,              /* Exterior Gateway Protocol            */
  IPPROTO_PUP = 12,             /* PUP protocol                         */
  IPPROTO_UDP = 17,             /* User Datagram Protocol               */
  IPPROTO_IDP = 22,             /* XNS IDP protocol                     */
  IPPROTO_RSVP = 46,            /* RSVP protocol                        */
  IPPROTO_GRE = 47,             /* Cisco GRE tunnels (rfc 1701,1702)    */

  IPPROTO_IPV6   = 41,          /* IPv6-in-IPv4 tunnelling              */

  IPPROTO_PIM    = 103,         /* Protocol Independent Multicast       */

  IPPROTO_ESP = 50,            /* Encapsulation Security Payload protocol */
  IPPROTO_AH = 51,             /* Authentication Header protocol       */
  IPPROTO_COMP   = 108,                /* Compression Header protocol */

  IPPROTO_RAW    = 255,         /* Raw IP packets                       */
  IPPROTO_MAX
};


/* Internet address. */
struct in_addr {
        __u32   s_addr;
};

#define IP_TOS          1
#define IP_TTL          2
#define IP_HDRINCL      3
#define IP_OPTIONS      4
#define IP_ROUTER_ALERT 5
#define IP_RECVOPTS     6
#define IP_RETOPTS      7
#define IP_PKTINFO      8
#define IP_PKTOPTIONS   9
#define IP_MTU_DISCOVER 10
#define IP_RECVERR      11
#define IP_RECVTTL      12
#define IP_RECVTOS      13
#define IP_MTU          14

/* BSD compatibility */
#define IP_RECVRETOPTS  IP_RETOPTS

/* IP_MTU_DISCOVER values */
#define IP_PMTUDISC_DONT                0       /* Never send DF frames */
#define IP_PMTUDISC_WANT                1       /* Use per route hints  */
#define IP_PMTUDISC_DO                  2       /* Always DF            */

#define IP_MULTICAST_IF                 32
#define IP_MULTICAST_TTL                33
#define IP_MULTICAST_LOOP               34
#define IP_ADD_MEMBERSHIP               35
#define IP_DROP_MEMBERSHIP              36

/* These need to appear somewhere around here */
#define IP_DEFAULT_MULTICAST_TTL        1
#define IP_DEFAULT_MULTICAST_LOOP       1

/* Request struct for multicast socket ops */

struct ip_mreq 
{
        struct in_addr imr_multiaddr;   /* IP multicast address of group */
        struct in_addr imr_interface;   /* local IP address of interface */
};

struct ip_mreqn
{
        struct in_addr  imr_multiaddr;          /* IP multicast address of group */
        struct in_addr  imr_address;            /* local IP address of interface */
        int             imr_ifindex;            /* Interface index */
};

struct in_pktinfo
{
        int             ipi_ifindex;
        struct in_addr  ipi_spec_dst;
        struct in_addr  ipi_addr;
};

/* Structure describing an Internet (IP) socket address. */
#define __SOCK_SIZE__   16              /* sizeof(struct sockaddr)      */
struct sockaddr_in {
  sa_family_t           sin_family;     /* Address family               */
  unsigned short int    sin_port;       /* Port number                  */
  struct in_addr        sin_addr;       /* Internet address             */

  /* Pad to size of `struct sockaddr'. */
  unsigned char         __pad[__SOCK_SIZE__ - sizeof(short int) -
                        sizeof(unsigned short int) - sizeof(struct in_addr)];
};
#define sin_zero        __pad           /* for BSD UNIX comp. -FvK      */


/*
 * 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)            ((((long int) (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)            ((((long int) (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)            ((((long int) (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)            ((((long int) (a)) & 0xf0000000) == 0xe0000000)
#define IN_MULTICAST(a)         IN_CLASSD(a)
#define IN_MULTICAST_NET        0xF0000000

#define IN_EXPERIMENTAL(a)      ((((long int) (a)) & 0xf0000000) == 0xf0000000)
#define IN_BADCLASS(a)          IN_EXPERIMENTAL((a))

/* Address to accept any incoming messages. */
#define INADDR_ANY              ((unsigned long int) 0x00000000)

/* Address to send to all hosts. */
#define INADDR_BROADCAST        ((unsigned long int) 0xffffffff)

/* Address indicating an error return. */
#define INADDR_NONE             ((unsigned long int) 0xffffffff)

/* Network number for local host loopback. */
#define IN_LOOPBACKNET          127

/* Address to loopback in software to local host.  */
#define INADDR_LOOPBACK         0x7f000001      /* 127.0.0.1   */
#define IN_LOOPBACK(a)          ((((long int) (a)) & 0xff000000) == 0x7f000000)

/* Defines for Multicast INADDR */
#define INADDR_UNSPEC_GROUP     0xe0000000U     /* 224.0.0.0   */
#define INADDR_ALLHOSTS_GROUP   0xe0000001U     /* 224.0.0.1   */
#define INADDR_ALLRTRS_GROUP    0xe0000002U     /* 224.0.0.2 */
#define INADDR_MAX_LOCAL_GROUP  0xe00000ffU     /* 224.0.0.255 */


/* <asm/byteorder.h> contains the htonl type stuff.. */
#include <asm/byteorder.h> 

#ifdef __KERNEL__
/* Some random defines to make it easier in the kernel.. */
#define LOOPBACK(x)     (((x) & htonl(0xff000000)) == htonl(0x7f000000))
#define MULTICAST(x)    (((x) & htonl(0xf0000000)) == htonl(0xe0000000))
#define BADCLASS(x)     (((x) & htonl(0xf0000000)) == htonl(0xf0000000))
#define ZERONET(x)      (((x) & htonl(0xff000000)) == htonl(0x00000000))
#define LOCAL_MCAST(x)  (((x) & htonl(0xFFFFFF00)) == htonl(0xE0000000))

#endif

#endif  /* _LINUX_IN_H */

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