inet/netinet/in.h

   1 /* Copyright (C) 1991-2024 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _NETINET_IN_H
  19 #define _NETINET_IN_H   1
  20
  21 #include <features.h>
  22 #include <bits/stdint-uintn.h>
  23 #include <sys/socket.h>
  24 #include <bits/types.h>
  25
  26
  27 __BEGIN_DECLS
  28
  29 /* Internet address.  */
  30 typedef uint32_t in_addr_t;
  31 struct in_addr
  32   {
  33     in_addr_t s_addr;
  34   };
  35
  36 /* Get system-specific definitions.  */
  37 #include <bits/in.h>
  38
  39 /* Standard well-defined IP protocols.  */
  40 enum
  41   {
  42     IPPROTO_IP = 0,        /* Dummy protocol for TCP.  */
  43 #define IPPROTO_IP              IPPROTO_IP
  44     IPPROTO_ICMP = 1,      /* Internet Control Message Protocol.  */
  45 #define IPPROTO_ICMP            IPPROTO_ICMP
  46     IPPROTO_IGMP = 2,      /* Internet Group Management Protocol. */
  47 #define IPPROTO_IGMP            IPPROTO_IGMP
  48     IPPROTO_IPIP = 4,      /* IPIP tunnels (older KA9Q tunnels use 94).  */
  49 #define IPPROTO_IPIP            IPPROTO_IPIP
  50     IPPROTO_TCP = 6,       /* Transmission Control Protocol.  */
  51 #define IPPROTO_TCP             IPPROTO_TCP
  52     IPPROTO_EGP = 8,       /* Exterior Gateway Protocol.  */
  53 #define IPPROTO_EGP             IPPROTO_EGP
  54     IPPROTO_PUP = 12,      /* PUP protocol.  */
  55 #define IPPROTO_PUP             IPPROTO_PUP
  56     IPPROTO_UDP = 17,      /* User Datagram Protocol.  */
  57 #define IPPROTO_UDP             IPPROTO_UDP
  58     IPPROTO_IDP = 22,      /* XNS IDP protocol.  */
  59 #define IPPROTO_IDP             IPPROTO_IDP
  60     IPPROTO_TP = 29,       /* SO Transport Protocol Class 4.  */
  61 #define IPPROTO_TP              IPPROTO_TP
  62     IPPROTO_DCCP = 33,     /* Datagram Congestion Control Protocol.  */
  63 #define IPPROTO_DCCP            IPPROTO_DCCP
  64     IPPROTO_IPV6 = 41,     /* IPv6 header.  */
  65 #define IPPROTO_IPV6            IPPROTO_IPV6
  66     IPPROTO_RSVP = 46,     /* Reservation Protocol.  */
  67 #define IPPROTO_RSVP            IPPROTO_RSVP
  68     IPPROTO_GRE = 47,      /* General Routing Encapsulation.  */
  69 #define IPPROTO_GRE             IPPROTO_GRE
  70     IPPROTO_ESP = 50,      /* encapsulating security payload.  */
  71 #define IPPROTO_ESP             IPPROTO_ESP
  72     IPPROTO_AH = 51,       /* authentication header.  */
  73 #define IPPROTO_AH              IPPROTO_AH
  74     IPPROTO_MTP = 92,      /* Multicast Transport Protocol.  */
  75 #define IPPROTO_MTP             IPPROTO_MTP
  76     IPPROTO_BEETPH = 94,   /* IP option pseudo header for BEET.  */
  77 #define IPPROTO_BEETPH          IPPROTO_BEETPH
  78     IPPROTO_ENCAP = 98,    /* Encapsulation Header.  */
  79 #define IPPROTO_ENCAP           IPPROTO_ENCAP
  80     IPPROTO_PIM = 103,     /* Protocol Independent Multicast.  */
  81 #define IPPROTO_PIM             IPPROTO_PIM
  82     IPPROTO_COMP = 108,    /* Compression Header Protocol.  */
  83 #define IPPROTO_COMP            IPPROTO_COMP
  84     IPPROTO_L2TP = 115,    /* Layer 2 Tunnelling Protocol.  */
  85 #define IPPROTO_L2TP            IPPROTO_L2TP
  86     IPPROTO_SCTP = 132,    /* Stream Control Transmission Protocol.  */
  87 #define IPPROTO_SCTP            IPPROTO_SCTP
  88     IPPROTO_UDPLITE = 136, /* UDP-Lite protocol.  */
  89 #define IPPROTO_UDPLITE         IPPROTO_UDPLITE
  90     IPPROTO_MPLS = 137,    /* MPLS in IP.  */
  91 #define IPPROTO_MPLS            IPPROTO_MPLS
  92     IPPROTO_ETHERNET = 143, /* Ethernet-within-IPv6 Encapsulation.  */
  93 #define IPPROTO_ETHERNET        IPPROTO_ETHERNET
  94     IPPROTO_RAW = 255,     /* Raw IP packets.  */
  95 #define IPPROTO_RAW             IPPROTO_RAW
  96     IPPROTO_MPTCP = 262,   /* Multipath TCP connection.  */
  97 #define IPPROTO_MPTCP           IPPROTO_MPTCP
  98     IPPROTO_MAX
  99   };
 100
 101 /* If __USE_KERNEL_IPV6_DEFS is 1 then the user has included the kernel
 102    network headers first and we should use those ABI-identical definitions
 103    instead of our own, otherwise 0.  */
 104 #if !__USE_KERNEL_IPV6_DEFS
 105 enum
 106   {
 107     IPPROTO_HOPOPTS = 0,   /* IPv6 Hop-by-Hop options.  */
 108 #define IPPROTO_HOPOPTS         IPPROTO_HOPOPTS
 109     IPPROTO_ROUTING = 43,  /* IPv6 routing header.  */
 110 #define IPPROTO_ROUTING         IPPROTO_ROUTING
 111     IPPROTO_FRAGMENT = 44, /* IPv6 fragmentation header.  */
 112 #define IPPROTO_FRAGMENT        IPPROTO_FRAGMENT
 113     IPPROTO_ICMPV6 = 58,   /* ICMPv6.  */
 114 #define IPPROTO_ICMPV6          IPPROTO_ICMPV6
 115     IPPROTO_NONE = 59,     /* IPv6 no next header.  */
 116 #define IPPROTO_NONE            IPPROTO_NONE
 117     IPPROTO_DSTOPTS = 60,  /* IPv6 destination options.  */
 118 #define IPPROTO_DSTOPTS         IPPROTO_DSTOPTS
 119     IPPROTO_MH = 135       /* IPv6 mobility header.  */
 120 #define IPPROTO_MH              IPPROTO_MH
 121   };
 122 #endif /* !__USE_KERNEL_IPV6_DEFS */
 123
 124 /* Type to represent a port.  */
 125 typedef uint16_t in_port_t;
 126
 127 /* Standard well-known ports.  */
 128 enum
 129   {
 130     IPPORT_ECHO = 7,            /* Echo service.  */
 131     IPPORT_DISCARD = 9,         /* Discard transmissions service.  */
 132     IPPORT_SYSTAT = 11,         /* System status service.  */
 133     IPPORT_DAYTIME = 13,        /* Time of day service.  */
 134     IPPORT_NETSTAT = 15,        /* Network status service.  */
 135     IPPORT_FTP = 21,            /* File Transfer Protocol.  */
 136     IPPORT_TELNET = 23,         /* Telnet protocol.  */
 137     IPPORT_SMTP = 25,           /* Simple Mail Transfer Protocol.  */
 138     IPPORT_TIMESERVER = 37,     /* Timeserver service.  */
 139     IPPORT_NAMESERVER = 42,     /* Domain Name Service.  */
 140     IPPORT_WHOIS = 43,          /* Internet Whois service.  */
 141     IPPORT_MTP = 57,
 142
 143     IPPORT_TFTP = 69,           /* Trivial File Transfer Protocol.  */
 144     IPPORT_RJE = 77,
 145     IPPORT_FINGER = 79,         /* Finger service.  */
 146     IPPORT_TTYLINK = 87,
 147     IPPORT_SUPDUP = 95,         /* SUPDUP protocol.  */
 148
 149
 150     IPPORT_EXECSERVER = 512,    /* execd service.  */
 151     IPPORT_LOGINSERVER = 513,   /* rlogind service.  */
 152     IPPORT_CMDSERVER = 514,
 153     IPPORT_EFSSERVER = 520,
 154
 155     /* UDP ports.  */
 156     IPPORT_BIFFUDP = 512,
 157     IPPORT_WHOSERVER = 513,
 158     IPPORT_ROUTESERVER = 520,
 159
 160     /* Ports less than this value are reserved for privileged processes.  */
 161     IPPORT_RESERVED = 1024,
 162
 163     /* Ports greater this value are reserved for (non-privileged) servers.  */
 164     IPPORT_USERRESERVED = 5000
 165   };
 166
 167 /* Definitions of the bits in an Internet address integer.
 168
 169    On subnets, host and network parts are found according to
 170    the subnet mask, not these masks.  */
 171
 172 #define IN_CLASSA(a)            ((((in_addr_t)(a)) & 0x80000000) == 0)
 173 #define IN_CLASSA_NET           0xff000000
 174 #define IN_CLASSA_NSHIFT        24
 175 #define IN_CLASSA_HOST          (0xffffffff & ~IN_CLASSA_NET)
 176 #define IN_CLASSA_MAX           128
 177
 178 #define IN_CLASSB(a)            ((((in_addr_t)(a)) & 0xc0000000) == 0x80000000)
 179 #define IN_CLASSB_NET           0xffff0000
 180 #define IN_CLASSB_NSHIFT        16
 181 #define IN_CLASSB_HOST          (0xffffffff & ~IN_CLASSB_NET)
 182 #define IN_CLASSB_MAX           65536
 183
 184 #define IN_CLASSC(a)            ((((in_addr_t)(a)) & 0xe0000000) == 0xc0000000)
 185 #define IN_CLASSC_NET           0xffffff00
 186 #define IN_CLASSC_NSHIFT        8
 187 #define IN_CLASSC_HOST          (0xffffffff & ~IN_CLASSC_NET)
 188
 189 #define IN_CLASSD(a)            ((((in_addr_t)(a)) & 0xf0000000) == 0xe0000000)
 190 #define IN_MULTICAST(a)         IN_CLASSD(a)
 191
 192 #define IN_EXPERIMENTAL(a)      ((((in_addr_t)(a)) & 0xe0000000) == 0xe0000000)
 193 #define IN_BADCLASS(a)          ((((in_addr_t)(a)) & 0xf0000000) == 0xf0000000)
 194
 195 /* Address to accept any incoming messages.  */
 196 #define INADDR_ANY              ((in_addr_t) 0x00000000)
 197 /* Address to send to all hosts.  */
 198 #define INADDR_BROADCAST        ((in_addr_t) 0xffffffff)
 199 /* Address indicating an error return.  */
 200 #define INADDR_NONE             ((in_addr_t) 0xffffffff)
 201 /* Dummy address for source of ICMPv6 errors converted to IPv4 (RFC
 202    7600).  */
 203 #define INADDR_DUMMY            ((in_addr_t) 0xc0000008)
 204
 205 /* Network number for local host loopback.  */
 206 #define IN_LOOPBACKNET          127
 207 /* Address to loopback in software to local host.  */
 208 #ifndef INADDR_LOOPBACK
 209 # define INADDR_LOOPBACK        ((in_addr_t) 0x7f000001) /* Inet 127.0.0.1.  */
 210 #endif
 211
 212 /* Defines for Multicast INADDR.  */
 213 #define INADDR_UNSPEC_GROUP     ((in_addr_t) 0xe0000000) /* 224.0.0.0 */
 214 #define INADDR_ALLHOSTS_GROUP   ((in_addr_t) 0xe0000001) /* 224.0.0.1 */
 215 #define INADDR_ALLRTRS_GROUP    ((in_addr_t) 0xe0000002) /* 224.0.0.2 */
 216 #define INADDR_ALLSNOOPERS_GROUP ((in_addr_t) 0xe000006a) /* 224.0.0.106 */
 217 #define INADDR_MAX_LOCAL_GROUP  ((in_addr_t) 0xe00000ff) /* 224.0.0.255 */
 218
 219 #if !__USE_KERNEL_IPV6_DEFS
 220 /* IPv6 address */
 221 struct in6_addr
 222   {
 223     union
 224       {
 225         uint8_t __u6_addr8[16];
 226         uint16_t __u6_addr16[8];
 227         uint32_t __u6_addr32[4];
 228       } __in6_u;
 229 #define s6_addr                 __in6_u.__u6_addr8
 230 #ifdef __USE_MISC
 231 # define s6_addr16              __in6_u.__u6_addr16
 232 # define s6_addr32              __in6_u.__u6_addr32
 233 #endif
 234   };
 235 #endif /* !__USE_KERNEL_IPV6_DEFS */
 236
 237 extern const struct in6_addr in6addr_any;        /* :: */
 238 extern const struct in6_addr in6addr_loopback;   /* ::1 */
 239 #define IN6ADDR_ANY_INIT { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } } }
 240 #define IN6ADDR_LOOPBACK_INIT { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 } } }
 241
 242 #define INET_ADDRSTRLEN 16
 243 #define INET6_ADDRSTRLEN 46
 244
 245
 246 /* Structure describing an Internet socket address.  */
 247 struct __attribute_struct_may_alias__ sockaddr_in
 248   {
 249     __SOCKADDR_COMMON (sin_);
 250     in_port_t sin_port;                 /* Port number.  */
 251     struct in_addr sin_addr;            /* Internet address.  */
 252
 253     /* Pad to size of `struct sockaddr'.  */
 254     unsigned char sin_zero[sizeof (struct sockaddr)
 255                            - __SOCKADDR_COMMON_SIZE
 256                            - sizeof (in_port_t)
 257                            - sizeof (struct in_addr)];
 258   };
 259
 260 #if __USE_KERNEL_IPV6_DEFS
 261 struct __attribute_struct_may_alias__ sockaddr_in6;
 262 #else
 263 /* Ditto, for IPv6.  */
 264 struct __attribute_struct_may_alias__ sockaddr_in6
 265   {
 266     __SOCKADDR_COMMON (sin6_);
 267     in_port_t sin6_port;        /* Transport layer port # */
 268     uint32_t sin6_flowinfo;     /* IPv6 flow information */
 269     struct in6_addr sin6_addr;  /* IPv6 address */
 270     uint32_t sin6_scope_id;     /* IPv6 scope-id */
 271   };
 272 #endif /* !__USE_KERNEL_IPV6_DEFS */
 273
 274 #ifdef __USE_MISC
 275 /* IPv4 multicast request.  */
 276 struct ip_mreq
 277   {
 278     /* IP multicast address of group.  */
 279     struct in_addr imr_multiaddr;
 280
 281     /* Local IP address of interface.  */
 282     struct in_addr imr_interface;
 283   };
 284
 285 /* IPv4 multicast request with interface index.  */
 286 struct ip_mreqn
 287   {
 288     /* IP multicast address of group.  */
 289     struct in_addr imr_multiaddr;
 290
 291     /* Local IP address of interface.  */
 292     struct in_addr imr_address;
 293
 294     /* Interface index.  */
 295     int imr_ifindex;
 296   };
 297
 298 struct ip_mreq_source
 299   {
 300     /* IP multicast address of group.  */
 301     struct in_addr imr_multiaddr;
 302
 303     /* IP address of interface.  */
 304     struct in_addr imr_interface;
 305
 306     /* IP address of source.  */
 307     struct in_addr imr_sourceaddr;
 308   };
 309 #endif
 310
 311 #if !__USE_KERNEL_IPV6_DEFS
 312 /* Likewise, for IPv6.  */
 313 struct ipv6_mreq
 314   {
 315     /* IPv6 multicast address of group */
 316     struct in6_addr ipv6mr_multiaddr;
 317
 318     /* local interface */
 319     unsigned int ipv6mr_interface;
 320   };
 321 #endif /* !__USE_KERNEL_IPV6_DEFS */
 322
 323 #ifdef __USE_MISC
 324 /* Multicast group request.  */
 325 struct group_req
 326   {
 327     /* Interface index.  */
 328     uint32_t gr_interface;
 329
 330     /* Group address.  */
 331     struct sockaddr_storage gr_group;
 332   };
 333
 334 struct group_source_req
 335   {
 336     /* Interface index.  */
 337     uint32_t gsr_interface;
 338
 339     /* Group address.  */
 340     struct sockaddr_storage gsr_group;
 341
 342     /* Source address.  */
 343     struct sockaddr_storage gsr_source;
 344   };
 345
 346
 347 /* Full-state filter operations.  */
 348 struct ip_msfilter
 349   {
 350     /* IP multicast address of group.  */
 351     struct in_addr imsf_multiaddr;
 352
 353     /* Local IP address of interface.  */
 354     struct in_addr imsf_interface;
 355
 356     /* Filter mode.  */
 357     uint32_t imsf_fmode;
 358
 359     /* Number of source addresses.  */
 360     uint32_t imsf_numsrc;
 361     /* Source addresses.  */
 362     struct in_addr imsf_slist[1];
 363   };
 364
 365 #define IP_MSFILTER_SIZE(numsrc) (sizeof (struct ip_msfilter) \
 366                                   - sizeof (struct in_addr)                   \
 367                                   + (numsrc) * sizeof (struct in_addr))
 368
 369 struct group_filter
 370   {
 371     /* Interface index.  */
 372     uint32_t gf_interface;
 373
 374     /* Group address.  */
 375     struct sockaddr_storage gf_group;
 376
 377     /* Filter mode.  */
 378     uint32_t gf_fmode;
 379
 380     /* Number of source addresses.  */
 381     uint32_t gf_numsrc;
 382     /* Source addresses.  */
 383     struct sockaddr_storage gf_slist[1];
 384 };
 385
 386 #define GROUP_FILTER_SIZE(numsrc) (sizeof (struct group_filter) \
 387                                    - sizeof (struct sockaddr_storage)         \
 388                                    + ((numsrc)                                \
 389                                       * sizeof (struct sockaddr_storage)))
 390 #endif
 391
 392 /* Functions to convert between host and network byte order.
 393
 394    Please note that these functions normally take `unsigned long int' or
 395    `unsigned short int' values as arguments and also return them.  But
 396    this was a short-sighted decision since on different systems the types
 397    may have different representations but the values are always the same.  */
 398
 399 extern uint32_t ntohl (uint32_t __netlong) __THROW __attribute__ ((__const__));
 400 extern uint16_t ntohs (uint16_t __netshort)
 401      __THROW __attribute__ ((__const__));
 402 extern uint32_t htonl (uint32_t __hostlong)
 403      __THROW __attribute__ ((__const__));
 404 extern uint16_t htons (uint16_t __hostshort)
 405      __THROW __attribute__ ((__const__));
 406
 407 #include <endian.h>
 408
 409 /* Get machine dependent optimized versions of byte swapping functions.  */
 410 #include <bits/byteswap.h>
 411 #include <bits/uintn-identity.h>
 412
 413 #ifdef __OPTIMIZE__
 414 /* We can optimize calls to the conversion functions.  Either nothing has
 415    to be done or we are using directly the byte-swapping functions which
 416    often can be inlined.  */
 417 # if __BYTE_ORDER == __BIG_ENDIAN
 418 /* The host byte order is the same as network byte order,
 419    so these functions are all just identity.  */
 420 # define ntohl(x)       __uint32_identity (x)
 421 # define ntohs(x)       __uint16_identity (x)
 422 # define htonl(x)       __uint32_identity (x)
 423 # define htons(x)       __uint16_identity (x)
 424 # else
 425 #  if __BYTE_ORDER == __LITTLE_ENDIAN
 426 #   define ntohl(x)     __bswap_32 (x)
 427 #   define ntohs(x)     __bswap_16 (x)
 428 #   define htonl(x)     __bswap_32 (x)
 429 #   define htons(x)     __bswap_16 (x)
 430 #  endif
 431 # endif
 432 #endif
 433
 434 #ifdef __GNUC__
 435 # define IN6_IS_ADDR_UNSPECIFIED(a) \
 436   (__extension__                                                              \
 437    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 438       __a->__in6_u.__u6_addr32[0] == 0                                        \
 439       && __a->__in6_u.__u6_addr32[1] == 0                                     \
 440       && __a->__in6_u.__u6_addr32[2] == 0                                     \
 441       && __a->__in6_u.__u6_addr32[3] == 0; }))
 442
 443 # define IN6_IS_ADDR_LOOPBACK(a) \
 444   (__extension__                                                              \
 445    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 446       __a->__in6_u.__u6_addr32[0] == 0                                        \
 447       && __a->__in6_u.__u6_addr32[1] == 0                                     \
 448       && __a->__in6_u.__u6_addr32[2] == 0                                     \
 449       && __a->__in6_u.__u6_addr32[3] == htonl (1); }))
 450
 451 # define IN6_IS_ADDR_LINKLOCAL(a) \
 452   (__extension__                                                              \
 453    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 454       (__a->__in6_u.__u6_addr32[0] & htonl (0xffc00000)) == htonl (0xfe800000); }))
 455
 456 # define IN6_IS_ADDR_SITELOCAL(a) \
 457   (__extension__                                                              \
 458    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 459       (__a->__in6_u.__u6_addr32[0] & htonl (0xffc00000)) == htonl (0xfec00000); }))
 460
 461 # define IN6_IS_ADDR_V4MAPPED(a) \
 462   (__extension__                                                              \
 463    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 464       __a->__in6_u.__u6_addr32[0] == 0                                        \
 465       && __a->__in6_u.__u6_addr32[1] == 0                                     \
 466       && __a->__in6_u.__u6_addr32[2] == htonl (0xffff); }))
 467
 468 # define IN6_IS_ADDR_V4COMPAT(a) \
 469   (__extension__                                                              \
 470    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 471       __a->__in6_u.__u6_addr32[0] == 0                                        \
 472       && __a->__in6_u.__u6_addr32[1] == 0                                     \
 473       && __a->__in6_u.__u6_addr32[2] == 0                                     \
 474       && ntohl (__a->__in6_u.__u6_addr32[3]) > 1; }))
 475
 476 # define IN6_ARE_ADDR_EQUAL(a,b) \
 477   (__extension__                                                              \
 478    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 479       const struct in6_addr *__b = (const struct in6_addr *) (b);             \
 480       __a->__in6_u.__u6_addr32[0] == __b->__in6_u.__u6_addr32[0]              \
 481       && __a->__in6_u.__u6_addr32[1] == __b->__in6_u.__u6_addr32[1]           \
 482       && __a->__in6_u.__u6_addr32[2] == __b->__in6_u.__u6_addr32[2]           \
 483       && __a->__in6_u.__u6_addr32[3] == __b->__in6_u.__u6_addr32[3]; }))
 484 #else
 485 # define IN6_IS_ADDR_UNSPECIFIED(a) \
 486         (((const uint32_t *) (a))[0] == 0                                     \
 487          && ((const uint32_t *) (a))[1] == 0                                  \
 488          && ((const uint32_t *) (a))[2] == 0                                  \
 489          && ((const uint32_t *) (a))[3] == 0)
 490
 491 # define IN6_IS_ADDR_LOOPBACK(a) \
 492         (((const uint32_t *) (a))[0] == 0                                     \
 493          && ((const uint32_t *) (a))[1] == 0                                  \
 494          && ((const uint32_t *) (a))[2] == 0                                  \
 495          && ((const uint32_t *) (a))[3] == htonl (1))
 496
 497 # define IN6_IS_ADDR_LINKLOCAL(a) \
 498         ((((const uint32_t *) (a))[0] & htonl (0xffc00000))                   \
 499          == htonl (0xfe800000))
 500
 501 # define IN6_IS_ADDR_SITELOCAL(a) \
 502         ((((const uint32_t *) (a))[0] & htonl (0xffc00000))                   \
 503          == htonl (0xfec00000))
 504
 505 # define IN6_IS_ADDR_V4MAPPED(a) \
 506         ((((const uint32_t *) (a))[0] == 0)                                   \
 507          && (((const uint32_t *) (a))[1] == 0)                                \
 508          && (((const uint32_t *) (a))[2] == htonl (0xffff)))
 509
 510 # define IN6_IS_ADDR_V4COMPAT(a) \
 511         ((((const uint32_t *) (a))[0] == 0)                                   \
 512          && (((const uint32_t *) (a))[1] == 0)                                \
 513          && (((const uint32_t *) (a))[2] == 0)                                \
 514          && (ntohl (((const uint32_t *) (a))[3]) > 1))
 515
 516 # define IN6_ARE_ADDR_EQUAL(a,b) \
 517         ((((const uint32_t *) (a))[0] == ((const uint32_t *) (b))[0])         \
 518          && (((const uint32_t *) (a))[1] == ((const uint32_t *) (b))[1])      \
 519          && (((const uint32_t *) (a))[2] == ((const uint32_t *) (b))[2])      \
 520          && (((const uint32_t *) (a))[3] == ((const uint32_t *) (b))[3]))
 521 #endif
 522
 523 #define IN6_IS_ADDR_MULTICAST(a) (((const uint8_t *) (a))[0] == 0xff)
 524
 525 #ifdef __USE_MISC
 526 /* Bind socket to a privileged IP port.  */
 527 extern int bindresvport (int __sockfd, struct sockaddr_in *__sock_in) __THROW;
 528
 529 /* The IPv6 version of this function.  */
 530 extern int bindresvport6 (int __sockfd, struct sockaddr_in6 *__sock_in)
 531      __THROW;
 532 #endif
 533
 534
 535 #define IN6_IS_ADDR_MC_NODELOCAL(a) \
 536         (IN6_IS_ADDR_MULTICAST(a)                                             \
 537          && ((((const uint8_t *) (a))[1] & 0xf) == 0x1))
 538
 539 #define IN6_IS_ADDR_MC_LINKLOCAL(a) \
 540         (IN6_IS_ADDR_MULTICAST(a)                                             \
 541          && ((((const uint8_t *) (a))[1] & 0xf) == 0x2))
 542
 543 #define IN6_IS_ADDR_MC_SITELOCAL(a) \
 544         (IN6_IS_ADDR_MULTICAST(a)                                             \
 545          && ((((const uint8_t *) (a))[1] & 0xf) == 0x5))
 546
 547 #define IN6_IS_ADDR_MC_ORGLOCAL(a) \
 548         (IN6_IS_ADDR_MULTICAST(a)                                             \
 549          && ((((const uint8_t *) (a))[1] & 0xf) == 0x8))
 550
 551 #define IN6_IS_ADDR_MC_GLOBAL(a) \
 552         (IN6_IS_ADDR_MULTICAST(a)                                             \
 553          && ((((const uint8_t *) (a))[1] & 0xf) == 0xe))
 554
 555
 556 #ifdef __USE_GNU
 557 struct cmsghdr;                 /* Forward declaration.  */
 558
 559 #if !__USE_KERNEL_IPV6_DEFS
 560 /* IPv6 packet information.  */
 561 struct in6_pktinfo
 562   {
 563     struct in6_addr ipi6_addr;  /* src/dst IPv6 address */
 564     unsigned int ipi6_ifindex;  /* send/recv interface index */
 565   };
 566
 567 /* IPv6 MTU information.  */
 568 struct ip6_mtuinfo
 569   {
 570     struct sockaddr_in6 ip6m_addr; /* dst address including zone ID */
 571     uint32_t ip6m_mtu;             /* path MTU in host byte order */
 572   };
 573 #endif /* !__USE_KERNEL_IPV6_DEFS */
 574
 575 /* Obsolete hop-by-hop and Destination Options Processing (RFC 2292).  */
 576 extern int inet6_option_space (int __nbytes)
 577      __THROW __attribute_deprecated__;
 578 extern int inet6_option_init (void *__bp, struct cmsghdr **__cmsgp,
 579                               int __type) __THROW __attribute_deprecated__;
 580 extern int inet6_option_append (struct cmsghdr *__cmsg,
 581                                 const uint8_t *__typep, int __multx,
 582                                 int __plusy) __THROW __attribute_deprecated__;
 583 extern uint8_t *inet6_option_alloc (struct cmsghdr *__cmsg, int __datalen,
 584                                     int __multx, int __plusy)
 585      __THROW __attribute_deprecated__;
 586 extern int inet6_option_next (const struct cmsghdr *__cmsg,
 587                               uint8_t **__tptrp)
 588      __THROW __attribute_deprecated__;
 589 extern int inet6_option_find (const struct cmsghdr *__cmsg,
 590                               uint8_t **__tptrp, int __type)
 591      __THROW __attribute_deprecated__;
 592
 593
 594 /* Hop-by-Hop and Destination Options Processing (RFC 3542).  */
 595 extern int inet6_opt_init (void *__extbuf, socklen_t __extlen) __THROW;
 596 extern int inet6_opt_append (void *__extbuf, socklen_t __extlen, int __offset,
 597                              uint8_t __type, socklen_t __len, uint8_t __align,
 598                              void **__databufp) __THROW;
 599 extern int inet6_opt_finish (void *__extbuf, socklen_t __extlen, int __offset)
 600      __THROW;
 601 extern int inet6_opt_set_val (void *__databuf, int __offset, void *__val,
 602                               socklen_t __vallen) __THROW;
 603 extern int inet6_opt_next (void *__extbuf, socklen_t __extlen, int __offset,
 604                            uint8_t *__typep, socklen_t *__lenp,
 605                            void **__databufp) __THROW;
 606 extern int inet6_opt_find (void *__extbuf, socklen_t __extlen, int __offset,
 607                            uint8_t __type, socklen_t *__lenp,
 608                            void **__databufp) __THROW;
 609 extern int inet6_opt_get_val (void *__databuf, int __offset, void *__val,
 610                               socklen_t __vallen) __THROW;
 611
 612
 613 /* Routing Header Option (RFC 3542).  */
 614 extern socklen_t inet6_rth_space (int __type, int __segments) __THROW;
 615 extern void *inet6_rth_init (void *__bp, socklen_t __bp_len, int __type,
 616                              int __segments) __THROW;
 617 extern int inet6_rth_add (void *__bp, const struct in6_addr *__addr) __THROW;
 618 extern int inet6_rth_reverse (const void *__in, void *__out) __THROW;
 619 extern int inet6_rth_segments (const void *__bp) __THROW;
 620 extern struct in6_addr *inet6_rth_getaddr (const void *__bp, int __index)
 621      __THROW;
 622
 623
 624 /* Multicast source filter support.  */
 625
 626 /* Get IPv4 source filter.  */
 627 extern int getipv4sourcefilter (int __s, struct in_addr __interface_addr,
 628                                 struct in_addr __group, uint32_t *__fmode,
 629                                 uint32_t *__numsrc, struct in_addr *__slist)
 630      __THROW;
 631
 632 /* Set IPv4 source filter.  */
 633 extern int setipv4sourcefilter (int __s, struct in_addr __interface_addr,
 634                                 struct in_addr __group, uint32_t __fmode,
 635                                 uint32_t __numsrc,
 636                                 const struct in_addr *__slist)
 637      __THROW;
 638
 639
 640 /* Get source filter.  */
 641 extern int getsourcefilter (int __s, uint32_t __interface_addr,
 642                             const struct sockaddr *__group,
 643                             socklen_t __grouplen, uint32_t *__fmode,
 644                             uint32_t *__numsrc,
 645                             struct sockaddr_storage *__slist) __THROW;
 646
 647 /* Set source filter.  */
 648 extern int setsourcefilter (int __s, uint32_t __interface_addr,
 649                             const struct sockaddr *__group,
 650                             socklen_t __grouplen, uint32_t __fmode,
 651                             uint32_t __numsrc,
 652                             const struct sockaddr_storage *__slist) __THROW;
 653 #endif  /* use GNU */
 654
 655 __END_DECLS
 656
 657 #endif  /* netinet/in.h */