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 #include <linux/socket.h>
  23
  24 /* Standard well-defined IP protocols.  */
  25 enum {
  26   IPPROTO_IP = 0,               /* Dummy protocol for TCP               */
  27   IPPROTO_ICMP = 1,             /* Internet Control Message Protocol    */
  28   IPPROTO_IGMP = 2,             /* Internet Group Management Protocol   */
  29   IPPROTO_IPIP = 4,             /* IPIP tunnels (older KA9Q tunnels use 94) */
  30   IPPROTO_TCP = 6,              /* Transmission Control Protocol        */
  31   IPPROTO_EGP = 8,              /* Exterior Gateway Protocol            */
  32   IPPROTO_PUP = 12,             /* PUP protocol                         */
  33   IPPROTO_UDP = 17,             /* User Datagram Protocol               */
  34   IPPROTO_IDP = 22,             /* XNS IDP protocol                     */
  35   IPPROTO_DCCP = 33,            /* Datagram Congestion Control Protocol */
  36   IPPROTO_RSVP = 46,            /* RSVP protocol                        */
  37   IPPROTO_GRE = 47,             /* Cisco GRE tunnels (rfc 1701,1702)    */
  38
  39   IPPROTO_IPV6   = 41,          /* IPv6-in-IPv4 tunnelling              */
  40
  41   IPPROTO_ESP = 50,            /* Encapsulation Security Payload protocol */
  42   IPPROTO_AH = 51,             /* Authentication Header protocol       */
  43   IPPROTO_PIM    = 103,         /* Protocol Independent Multicast       */
  44
  45   IPPROTO_COMP   = 108,                /* Compression Header protocol */
  46   IPPROTO_SCTP   = 132,         /* Stream Control Transport Protocol    */
  47
  48   IPPROTO_RAW    = 255,         /* Raw IP packets                       */
  49   IPPROTO_MAX
  50 };
  51
  52
  53 /* Internet address. */
  54 struct in_addr {
  55         __u32   s_addr;
  56 };
  57
  58 #define IP_TOS          1
  59 #define IP_TTL          2
  60 #define IP_HDRINCL      3
  61 #define IP_OPTIONS      4
  62 #define IP_ROUTER_ALERT 5
  63 #define IP_RECVOPTS     6
  64 #define IP_RETOPTS      7
  65 #define IP_PKTINFO      8
  66 #define IP_PKTOPTIONS   9
  67 #define IP_MTU_DISCOVER 10
  68 #define IP_RECVERR      11
  69 #define IP_RECVTTL      12
  70 #define IP_RECVTOS      13
  71 #define IP_MTU          14
  72 #define IP_FREEBIND     15
  73 #define IP_IPSEC_POLICY 16
  74 #define IP_XFRM_POLICY  17
  75
  76 /* BSD compatibility */
  77 #define IP_RECVRETOPTS  IP_RETOPTS
  78
  79 /* IP_MTU_DISCOVER values */
  80 #define IP_PMTUDISC_DONT                0       /* Never send DF frames */
  81 #define IP_PMTUDISC_WANT                1       /* Use per route hints  */
  82 #define IP_PMTUDISC_DO                  2       /* Always DF            */
  83
  84 #define IP_MULTICAST_IF                 32
  85 #define IP_MULTICAST_TTL                33
  86 #define IP_MULTICAST_LOOP               34
  87 #define IP_ADD_MEMBERSHIP               35
  88 #define IP_DROP_MEMBERSHIP              36
  89 #define IP_UNBLOCK_SOURCE               37
  90 #define IP_BLOCK_SOURCE                 38
  91 #define IP_ADD_SOURCE_MEMBERSHIP        39
  92 #define IP_DROP_SOURCE_MEMBERSHIP       40
  93 #define IP_MSFILTER                     41
  94 #define MCAST_JOIN_GROUP                42
  95 #define MCAST_BLOCK_SOURCE              43
  96 #define MCAST_UNBLOCK_SOURCE            44
  97 #define MCAST_LEAVE_GROUP               45
  98 #define MCAST_JOIN_SOURCE_GROUP         46
  99 #define MCAST_LEAVE_SOURCE_GROUP        47
 100 #define MCAST_MSFILTER                  48
 101
 102 #define MCAST_EXCLUDE   0
 103 #define MCAST_INCLUDE   1
 104
 105 /* These need to appear somewhere around here */
 106 #define IP_DEFAULT_MULTICAST_TTL        1
 107 #define IP_DEFAULT_MULTICAST_LOOP       1
 108
 109 /* Request struct for multicast socket ops */
 110
 111 struct ip_mreq
 112 {
 113         struct in_addr imr_multiaddr;   /* IP multicast address of group */
 114         struct in_addr imr_interface;   /* local IP address of interface */
 115 };
 116
 117 struct ip_mreqn
 118 {
 119         struct in_addr  imr_multiaddr;          /* IP multicast address of group */
 120         struct in_addr  imr_address;            /* local IP address of interface */
 121         int             imr_ifindex;            /* Interface index */
 122 };
 123
 124 struct ip_mreq_source {
 125         __u32           imr_multiaddr;
 126         __u32           imr_interface;
 127         __u32           imr_sourceaddr;
 128 };
 129
 130 struct ip_msfilter {
 131         __u32           imsf_multiaddr;
 132         __u32           imsf_interface;
 133         __u32           imsf_fmode;
 134         __u32           imsf_numsrc;
 135         __u32           imsf_slist[1];
 136 };
 137
 138 #define IP_MSFILTER_SIZE(numsrc) \
 139         (sizeof(struct ip_msfilter) - sizeof(__u32) \
 140         + (numsrc) * sizeof(__u32))
 141
 142 struct group_req
 143 {
 144         __u32                            gr_interface;  /* interface index */
 145         struct __kernel_sockaddr_storage gr_group;      /* group address */
 146 };
 147
 148 struct group_source_req
 149 {
 150         __u32                            gsr_interface; /* interface index */
 151         struct __kernel_sockaddr_storage gsr_group;     /* group address */
 152         struct __kernel_sockaddr_storage gsr_source;    /* source address */
 153 };
 154
 155 struct group_filter
 156 {
 157         __u32                            gf_interface;  /* interface index */
 158         struct __kernel_sockaddr_storage gf_group;      /* multicast address */
 159         __u32                            gf_fmode;      /* filter mode */
 160         __u32                            gf_numsrc;     /* number of sources */
 161         struct __kernel_sockaddr_storage gf_slist[1];   /* interface index */
 162 };
 163
 164 #define GROUP_FILTER_SIZE(numsrc) \
 165         (sizeof(struct group_filter) - sizeof(struct __kernel_sockaddr_storage) \
 166         + (numsrc) * sizeof(struct __kernel_sockaddr_storage))
 167
 168 struct in_pktinfo
 169 {
 170         int             ipi_ifindex;
 171         struct in_addr  ipi_spec_dst;
 172         struct in_addr  ipi_addr;
 173 };
 174
 175 /* Structure describing an Internet (IP) socket address. */
 176 #define __SOCK_SIZE__   16              /* sizeof(struct sockaddr)      */
 177 struct sockaddr_in {
 178   sa_family_t           sin_family;     /* Address family               */
 179   unsigned short int    sin_port;       /* Port number                  */
 180   struct in_addr        sin_addr;       /* Internet address             */
 181
 182   /* Pad to size of `struct sockaddr'. */
 183   unsigned char         __pad[__SOCK_SIZE__ - sizeof(short int) -
 184                         sizeof(unsigned short int) - sizeof(struct in_addr)];
 185 };
 186 #define sin_zero        __pad           /* for BSD UNIX comp. -FvK      */
 187
 188
 189 /*
 190  * Definitions of the bits in an Internet address integer.
 191  * On subnets, host and network parts are found according
 192  * to the subnet mask, not these masks.
 193  */
 194 #define IN_CLASSA(a)            ((((long int) (a)) & 0x80000000) == 0)
 195 #define IN_CLASSA_NET           0xff000000
 196 #define IN_CLASSA_NSHIFT        24
 197 #define IN_CLASSA_HOST          (0xffffffff & ~IN_CLASSA_NET)
 198 #define IN_CLASSA_MAX           128
 199
 200 #define IN_CLASSB(a)            ((((long int) (a)) & 0xc0000000) == 0x80000000)
 201 #define IN_CLASSB_NET           0xffff0000
 202 #define IN_CLASSB_NSHIFT        16
 203 #define IN_CLASSB_HOST          (0xffffffff & ~IN_CLASSB_NET)
 204 #define IN_CLASSB_MAX           65536
 205
 206 #define IN_CLASSC(a)            ((((long int) (a)) & 0xe0000000) == 0xc0000000)
 207 #define IN_CLASSC_NET           0xffffff00
 208 #define IN_CLASSC_NSHIFT        8
 209 #define IN_CLASSC_HOST          (0xffffffff & ~IN_CLASSC_NET)
 210
 211 #define IN_CLASSD(a)            ((((long int) (a)) & 0xf0000000) == 0xe0000000)
 212 #define IN_MULTICAST(a)         IN_CLASSD(a)
 213 #define IN_MULTICAST_NET        0xF0000000
 214
 215 #define IN_EXPERIMENTAL(a)      ((((long int) (a)) & 0xf0000000) == 0xf0000000)
 216 #define IN_BADCLASS(a)          IN_EXPERIMENTAL((a))
 217
 218 /* Address to accept any incoming messages. */
 219 #define INADDR_ANY              ((unsigned long int) 0x00000000)
 220
 221 /* Address to send to all hosts. */
 222 #define INADDR_BROADCAST        ((unsigned long int) 0xffffffff)
 223
 224 /* Address indicating an error return. */
 225 #define INADDR_NONE             ((unsigned long int) 0xffffffff)
 226
 227 /* Network number for local host loopback. */
 228 #define IN_LOOPBACKNET          127
 229
 230 /* Address to loopback in software to local host.  */
 231 #define INADDR_LOOPBACK         0x7f000001      /* 127.0.0.1   */
 232 #define IN_LOOPBACK(a)          ((((long int) (a)) & 0xff000000) == 0x7f000000)
 233
 234 /* Defines for Multicast INADDR */
 235 #define INADDR_UNSPEC_GROUP     0xe0000000U     /* 224.0.0.0   */
 236 #define INADDR_ALLHOSTS_GROUP   0xe0000001U     /* 224.0.0.1   */
 237 #define INADDR_ALLRTRS_GROUP    0xe0000002U     /* 224.0.0.2 */
 238 #define INADDR_MAX_LOCAL_GROUP  0xe00000ffU     /* 224.0.0.255 */
 239
 240
 241 /* <asm/byteorder.h> contains the htonl type stuff.. */
 242 #include <asm/byteorder.h>
 243
 244 #ifdef __KERNEL__
 245 /* Some random defines to make it easier in the kernel.. */
 246 #define LOOPBACK(x)     (((x) & htonl(0xff000000)) == htonl(0x7f000000))
 247 #define MULTICAST(x)    (((x) & htonl(0xf0000000)) == htonl(0xe0000000))
 248 #define BADCLASS(x)     (((x) & htonl(0xf0000000)) == htonl(0xf0000000))
 249 #define ZERONET(x)      (((x) & htonl(0xff000000)) == htonl(0x00000000))
 250 #define LOCAL_MCAST(x)  (((x) & htonl(0xFFFFFF00)) == htonl(0xE0000000))
 251
 252 #endif
 253
 254 #endif  /* _LINUX_IN_H */