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_ESP = 50,            /* Encapsulation Security Payload protocol */
  42   IPPROTO_AH = 51,             /* Authentication Header protocol       */
  43   IPPROTO_COMP   = 108,                /* Compression Header protocol */
  44
  45   IPPROTO_RAW    = 255,         /* Raw IP packets                       */
  46   IPPROTO_MAX
  47 };
  48
  49
  50 /* Internet address. */
  51 struct in_addr {
  52         __u32   s_addr;
  53 };
  54
  55 #define IP_TOS          1
  56 #define IP_TTL          2
  57 #define IP_HDRINCL      3
  58 #define IP_OPTIONS      4
  59 #define IP_ROUTER_ALERT 5
  60 #define IP_RECVOPTS     6
  61 #define IP_RETOPTS      7
  62 #define IP_PKTINFO      8
  63 #define IP_PKTOPTIONS   9
  64 #define IP_MTU_DISCOVER 10
  65 #define IP_RECVERR      11
  66 #define IP_RECVTTL      12
  67 #define IP_RECVTOS      13
  68 #define IP_MTU          14
  69 #define IP_FREEBIND     15
  70
  71 /* BSD compatibility */
  72 #define IP_RECVRETOPTS  IP_RETOPTS
  73
  74 /* IP_MTU_DISCOVER values */
  75 #define IP_PMTUDISC_DONT                0       /* Never send DF frames */
  76 #define IP_PMTUDISC_WANT                1       /* Use per route hints  */
  77 #define IP_PMTUDISC_DO                  2       /* Always DF            */
  78
  79 #define IP_MULTICAST_IF                 32
  80 #define IP_MULTICAST_TTL                33
  81 #define IP_MULTICAST_LOOP               34
  82 #define IP_ADD_MEMBERSHIP               35
  83 #define IP_DROP_MEMBERSHIP              36
  84
  85 /* These need to appear somewhere around here */
  86 #define IP_DEFAULT_MULTICAST_TTL        1
  87 #define IP_DEFAULT_MULTICAST_LOOP       1
  88
  89 /* Request struct for multicast socket ops */
  90
  91 struct ip_mreq
  92 {
  93         struct in_addr imr_multiaddr;   /* IP multicast address of group */
  94         struct in_addr imr_interface;   /* local IP address of interface */
  95 };
  96
  97 struct ip_mreqn
  98 {
  99         struct in_addr  imr_multiaddr;          /* IP multicast address of group */
 100         struct in_addr  imr_address;            /* local IP address of interface */
 101         int             imr_ifindex;            /* Interface index */
 102 };
 103
 104 struct in_pktinfo
 105 {
 106         int             ipi_ifindex;
 107         struct in_addr  ipi_spec_dst;
 108         struct in_addr  ipi_addr;
 109 };
 110
 111 /* Structure describing an Internet (IP) socket address. */
 112 #define __SOCK_SIZE__   16              /* sizeof(struct sockaddr)      */
 113 struct sockaddr_in {
 114   sa_family_t           sin_family;     /* Address family               */
 115   unsigned short int    sin_port;       /* Port number                  */
 116   struct in_addr        sin_addr;       /* Internet address             */
 117
 118   /* Pad to size of `struct sockaddr'. */
 119   unsigned char         __pad[__SOCK_SIZE__ - sizeof(short int) -
 120                         sizeof(unsigned short int) - sizeof(struct in_addr)];
 121 };
 122 #define sin_zero        __pad           /* for BSD UNIX comp. -FvK      */
 123
 124
 125 /*
 126  * Definitions of the bits in an Internet address integer.
 127  * On subnets, host and network parts are found according
 128  * to the subnet mask, not these masks.
 129  */
 130 #define IN_CLASSA(a)            ((((long int) (a)) & 0x80000000) == 0)
 131 #define IN_CLASSA_NET           0xff000000
 132 #define IN_CLASSA_NSHIFT        24
 133 #define IN_CLASSA_HOST          (0xffffffff & ~IN_CLASSA_NET)
 134 #define IN_CLASSA_MAX           128
 135
 136 #define IN_CLASSB(a)            ((((long int) (a)) & 0xc0000000) == 0x80000000)
 137 #define IN_CLASSB_NET           0xffff0000
 138 #define IN_CLASSB_NSHIFT        16
 139 #define IN_CLASSB_HOST          (0xffffffff & ~IN_CLASSB_NET)
 140 #define IN_CLASSB_MAX           65536
 141
 142 #define IN_CLASSC(a)            ((((long int) (a)) & 0xe0000000) == 0xc0000000)
 143 #define IN_CLASSC_NET           0xffffff00
 144 #define IN_CLASSC_NSHIFT        8
 145 #define IN_CLASSC_HOST          (0xffffffff & ~IN_CLASSC_NET)
 146
 147 #define IN_CLASSD(a)            ((((long int) (a)) & 0xf0000000) == 0xe0000000)
 148 #define IN_MULTICAST(a)         IN_CLASSD(a)
 149 #define IN_MULTICAST_NET        0xF0000000
 150
 151 #define IN_EXPERIMENTAL(a)      ((((long int) (a)) & 0xf0000000) == 0xf0000000)
 152 #define IN_BADCLASS(a)          IN_EXPERIMENTAL((a))
 153
 154 /* Address to accept any incoming messages. */
 155 #define INADDR_ANY              ((unsigned long int) 0x00000000)
 156
 157 /* Address to send to all hosts. */
 158 #define INADDR_BROADCAST        ((unsigned long int) 0xffffffff)
 159
 160 /* Address indicating an error return. */
 161 #define INADDR_NONE             ((unsigned long int) 0xffffffff)
 162
 163 /* Network number for local host loopback. */
 164 #define IN_LOOPBACKNET          127
 165
 166 /* Address to loopback in software to local host.  */
 167 #define INADDR_LOOPBACK         0x7f000001      /* 127.0.0.1   */
 168 #define IN_LOOPBACK(a)          ((((long int) (a)) & 0xff000000) == 0x7f000000)
 169
 170 /* Defines for Multicast INADDR */
 171 #define INADDR_UNSPEC_GROUP     0xe0000000U     /* 224.0.0.0   */
 172 #define INADDR_ALLHOSTS_GROUP   0xe0000001U     /* 224.0.0.1   */
 173 #define INADDR_ALLRTRS_GROUP    0xe0000002U     /* 224.0.0.2 */
 174 #define INADDR_MAX_LOCAL_GROUP  0xe00000ffU     /* 224.0.0.255 */
 175
 176
 177 /* <asm/byteorder.h> contains the htonl type stuff.. */
 178 #include <asm/byteorder.h>
 179
 180 #ifdef __KERNEL__
 181 /* Some random defines to make it easier in the kernel.. */
 182 #define LOOPBACK(x)     (((x) & htonl(0xff000000)) == htonl(0x7f000000))
 183 #define MULTICAST(x)    (((x) & htonl(0xf0000000)) == htonl(0xe0000000))
 184 #define BADCLASS(x)     (((x) & htonl(0xf0000000)) == htonl(0xf0000000))
 185 #define ZERONET(x)      (((x) & htonl(0xff000000)) == htonl(0x00000000))
 186 #define LOCAL_MCAST(x)  (((x) & htonl(0xFFFFFF00)) == htonl(0xE0000000))
 187
 188 #endif
 189
 190 #endif  /* _LINUX_IN_H */