include/linux/in.h

   1 /*
   2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3  *              operating system.  INET is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              Definitions of the Internet Protocol.
   7  *
   8  * Version:     @(#)in.h        1.0.1   04/21/93
   9  *
  10  * Authors:     Original taken from the GNU Project <netinet/in.h> file.
  11  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  12  *
  13  *              This program is free software; you can redistribute it and/or
  14  *              modify it under the terms of the GNU General Public License
  15  *              as published by the Free Software Foundation; either version
  16  *              2 of the License, or (at your option) any later version.
  17  */
  18 #ifndef _LINUX_IN_H
  19 #define _LINUX_IN_H
  20
  21 #include <linux/types.h>
  22
  23 /* Standard well-defined IP protocols.  */
  24 enum {
  25   IPPROTO_IP = 0,               /* Dummy protocol for TCP               */
  26   IPPROTO_ICMP = 1,             /* Internet Control Message Protocol    */
  27   IPPROTO_IGMP = 2,             /* Internet Group Management Protocol   */
  28   IPPROTO_IPIP = 4,             /* IPIP tunnels (older KA9Q tunnels use 94) */
  29   IPPROTO_TCP = 6,              /* Transmission Control Protocol        */
  30   IPPROTO_EGP = 8,              /* Exterior Gateway Protocol            */
  31   IPPROTO_PUP = 12,             /* PUP protocol                         */
  32   IPPROTO_UDP = 17,             /* User Datagram Protocol               */
  33   IPPROTO_IDP = 22,             /* XNS IDP protocol                     */
  34   IPPROTO_RSVP = 46,            /* RSVP protocol                        */
  35   IPPROTO_GRE = 47,             /* Cisco GRE tunnels (rfc 1701,1702)    */
  36
  37   IPPROTO_IPV6   = 41,          /* IPv6-in-IPv4 tunnelling              */
  38
  39   IPPROTO_PIM    = 103,         /* Protocol Independent Multicast       */
  40
  41   IPPROTO_RAW    = 255,         /* Raw IP packets                       */
  42   IPPROTO_MAX
  43 };
  44
  45
  46 /* Internet address. */
  47 struct in_addr {
  48         __u32   s_addr;
  49 };
  50
  51 #define IP_TOS          1
  52 #define IP_TTL          2
  53 #define IP_HDRINCL      3
  54 #define IP_OPTIONS      4
  55 #define IP_ROUTER_ALERT 5
  56 #define IP_RECVOPTS     6
  57 #define IP_RETOPTS      7
  58 #define IP_PKTINFO      8
  59 #define IP_PKTOPTIONS   9
  60 #define IP_MTU_DISCOVER 10
  61 #define IP_RECVERR      11
  62 #define IP_RECVTTL      12
  63 #define IP_RECVTOS      13
  64 #define IP_MTU          14
  65
  66 /* BSD compatibility */
  67 #define IP_RECVRETOPTS  IP_RETOPTS
  68
  69 /* IP_MTU_DISCOVER values */
  70 #define IP_PMTUDISC_DONT                0       /* Never send DF frames */
  71 #define IP_PMTUDISC_WANT                1       /* Use per route hints  */
  72 #define IP_PMTUDISC_DO                  2       /* Always DF            */
  73
  74 #define IP_MULTICAST_IF                 32
  75 #define IP_MULTICAST_TTL                33
  76 #define IP_MULTICAST_LOOP               34
  77 #define IP_ADD_MEMBERSHIP               35
  78 #define IP_DROP_MEMBERSHIP              36
  79
  80 /* These need to appear somewhere around here */
  81 #define IP_DEFAULT_MULTICAST_TTL        1
  82 #define IP_DEFAULT_MULTICAST_LOOP       1
  83 #define IP_MAX_MEMBERSHIPS              20
  84
  85 /* Request struct for multicast socket ops */
  86
  87 struct ip_mreq
  88 {
  89         struct in_addr imr_multiaddr;   /* IP multicast address of group */
  90         struct in_addr imr_interface;   /* local IP address of interface */
  91 };
  92
  93 struct ip_mreqn
  94 {
  95         struct in_addr  imr_multiaddr;          /* IP multicast address of group */
  96         struct in_addr  imr_address;            /* local IP address of interface */
  97         int             imr_ifindex;            /* Interface index */
  98 };
  99
 100 struct in_pktinfo
 101 {
 102         int             ipi_ifindex;
 103         struct in_addr  ipi_spec_dst;
 104         struct in_addr  ipi_addr;
 105 };
 106
 107 /* Structure describing an Internet (IP) socket address. */
 108 #define __SOCK_SIZE__   16              /* sizeof(struct sockaddr)      */
 109 struct sockaddr_in {
 110   sa_family_t           sin_family;     /* Address family               */
 111   unsigned short int    sin_port;       /* Port number                  */
 112   struct in_addr        sin_addr;       /* Internet address             */
 113
 114   /* Pad to size of `struct sockaddr'. */
 115   unsigned char         __pad[__SOCK_SIZE__ - sizeof(short int) -
 116                         sizeof(unsigned short int) - sizeof(struct in_addr)];
 117 };
 118 #define sin_zero        __pad           /* for BSD UNIX comp. -FvK      */
 119
 120
 121 /*
 122  * Definitions of the bits in an Internet address integer.
 123  * On subnets, host and network parts are found according
 124  * to the subnet mask, not these masks.
 125  */
 126 #define IN_CLASSA(a)            ((((long int) (a)) & 0x80000000) == 0)
 127 #define IN_CLASSA_NET           0xff000000
 128 #define IN_CLASSA_NSHIFT        24
 129 #define IN_CLASSA_HOST          (0xffffffff & ~IN_CLASSA_NET)
 130 #define IN_CLASSA_MAX           128
 131
 132 #define IN_CLASSB(a)            ((((long int) (a)) & 0xc0000000) == 0x80000000)
 133 #define IN_CLASSB_NET           0xffff0000
 134 #define IN_CLASSB_NSHIFT        16
 135 #define IN_CLASSB_HOST          (0xffffffff & ~IN_CLASSB_NET)
 136 #define IN_CLASSB_MAX           65536
 137
 138 #define IN_CLASSC(a)            ((((long int) (a)) & 0xe0000000) == 0xc0000000)
 139 #define IN_CLASSC_NET           0xffffff00
 140 #define IN_CLASSC_NSHIFT        8
 141 #define IN_CLASSC_HOST          (0xffffffff & ~IN_CLASSC_NET)
 142
 143 #define IN_CLASSD(a)            ((((long int) (a)) & 0xf0000000) == 0xe0000000)
 144 #define IN_MULTICAST(a)         IN_CLASSD(a)
 145 #define IN_MULTICAST_NET        0xF0000000
 146
 147 #define IN_EXPERIMENTAL(a)      ((((long int) (a)) & 0xf0000000) == 0xf0000000)
 148 #define IN_BADCLASS(a)          IN_EXPERIMENTAL((a))
 149
 150 /* Address to accept any incoming messages. */
 151 #define INADDR_ANY              ((unsigned long int) 0x00000000)
 152
 153 /* Address to send to all hosts. */
 154 #define INADDR_BROADCAST        ((unsigned long int) 0xffffffff)
 155
 156 /* Address indicating an error return. */
 157 #define INADDR_NONE             ((unsigned long int) 0xffffffff)
 158
 159 /* Network number for local host loopback. */
 160 #define IN_LOOPBACKNET          127
 161
 162 /* Address to loopback in software to local host.  */
 163 #define INADDR_LOOPBACK         0x7f000001      /* 127.0.0.1   */
 164 #define IN_LOOPBACK(a)          ((((long int) (a)) & 0xff000000) == 0x7f000000)
 165
 166 /* Defines for Multicast INADDR */
 167 #define INADDR_UNSPEC_GROUP     0xe0000000U     /* 224.0.0.0   */
 168 #define INADDR_ALLHOSTS_GROUP   0xe0000001U     /* 224.0.0.1   */
 169 #define INADDR_ALLRTRS_GROUP    0xe0000002U     /* 224.0.0.2 */
 170 #define INADDR_MAX_LOCAL_GROUP  0xe00000ffU     /* 224.0.0.255 */
 171
 172
 173 /* <asm/byteorder.h> contains the htonl type stuff.. */
 174 #include <asm/byteorder.h>
 175
 176 #ifdef __KERNEL__
 177 /* Some random defines to make it easier in the kernel.. */
 178 #define LOOPBACK(x)     (((x) & htonl(0xff000000)) == htonl(0x7f000000))
 179 #define MULTICAST(x)    (((x) & htonl(0xf0000000)) == htonl(0xe0000000))
 180 #define BADCLASS(x)     (((x) & htonl(0xf0000000)) == htonl(0xf0000000))
 181 #define ZERONET(x)      (((x) & htonl(0xff000000)) == htonl(0x00000000))
 182 #define LOCAL_MCAST(x)  (((x) & htonl(0xFFFFFF00)) == htonl(0xE0000000))
 183
 184 #endif
 185
 186 #endif  /* _LINUX_IN_H */