inet/netinet/in.h

   1 /* Copyright (C) 1991-2001, 2003, 2004, 2006, 2007
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _NETINET_IN_H
  21 #define _NETINET_IN_H   1
  22
  23 #include <features.h>
  24 #include <stdint.h>
  25 #include <sys/socket.h>
  26 #include <bits/types.h>
  27
  28
  29 __BEGIN_DECLS
  30
  31 /* Standard well-defined IP protocols.  */
  32 enum
  33   {
  34     IPPROTO_IP = 0,        /* Dummy protocol for TCP.  */
  35 #define IPPROTO_IP              IPPROTO_IP
  36     IPPROTO_HOPOPTS = 0,   /* IPv6 Hop-by-Hop options.  */
  37 #define IPPROTO_HOPOPTS         IPPROTO_HOPOPTS
  38     IPPROTO_ICMP = 1,      /* Internet Control Message Protocol.  */
  39 #define IPPROTO_ICMP            IPPROTO_ICMP
  40     IPPROTO_IGMP = 2,      /* Internet Group Management Protocol. */
  41 #define IPPROTO_IGMP            IPPROTO_IGMP
  42     IPPROTO_IPIP = 4,      /* IPIP tunnels (older KA9Q tunnels use 94).  */
  43 #define IPPROTO_IPIP            IPPROTO_IPIP
  44     IPPROTO_TCP = 6,       /* Transmission Control Protocol.  */
  45 #define IPPROTO_TCP             IPPROTO_TCP
  46     IPPROTO_EGP = 8,       /* Exterior Gateway Protocol.  */
  47 #define IPPROTO_EGP             IPPROTO_EGP
  48     IPPROTO_PUP = 12,      /* PUP protocol.  */
  49 #define IPPROTO_PUP             IPPROTO_PUP
  50     IPPROTO_UDP = 17,      /* User Datagram Protocol.  */
  51 #define IPPROTO_UDP             IPPROTO_UDP
  52     IPPROTO_IDP = 22,      /* XNS IDP protocol.  */
  53 #define IPPROTO_IDP             IPPROTO_IDP
  54     IPPROTO_TP = 29,       /* SO Transport Protocol Class 4.  */
  55 #define IPPROTO_TP              IPPROTO_TP
  56     IPPROTO_IPV6 = 41,     /* IPv6 header.  */
  57 #define IPPROTO_IPV6            IPPROTO_IPV6
  58     IPPROTO_ROUTING = 43,  /* IPv6 routing header.  */
  59 #define IPPROTO_ROUTING         IPPROTO_ROUTING
  60     IPPROTO_FRAGMENT = 44, /* IPv6 fragmentation header.  */
  61 #define IPPROTO_FRAGMENT        IPPROTO_FRAGMENT
  62     IPPROTO_RSVP = 46,     /* Reservation Protocol.  */
  63 #define IPPROTO_RSVP            IPPROTO_RSVP
  64     IPPROTO_GRE = 47,      /* General Routing Encapsulation.  */
  65 #define IPPROTO_GRE             IPPROTO_GRE
  66     IPPROTO_ESP = 50,      /* encapsulating security payload.  */
  67 #define IPPROTO_ESP             IPPROTO_ESP
  68     IPPROTO_AH = 51,       /* authentication header.  */
  69 #define IPPROTO_AH              IPPROTO_AH
  70     IPPROTO_ICMPV6 = 58,   /* ICMPv6.  */
  71 #define IPPROTO_ICMPV6          IPPROTO_ICMPV6
  72     IPPROTO_NONE = 59,     /* IPv6 no next header.  */
  73 #define IPPROTO_NONE            IPPROTO_NONE
  74     IPPROTO_DSTOPTS = 60,  /* IPv6 destination options.  */
  75 #define IPPROTO_DSTOPTS         IPPROTO_DSTOPTS
  76     IPPROTO_MTP = 92,      /* Multicast Transport Protocol.  */
  77 #define IPPROTO_MTP             IPPROTO_MTP
  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_SCTP = 132,    /* Stream Control Transmission Protocol.  */
  85 #define IPPROTO_SCTP            IPPROTO_SCTP
  86     IPPROTO_RAW = 255,     /* Raw IP packets.  */
  87 #define IPPROTO_RAW             IPPROTO_RAW
  88     IPPROTO_MAX
  89   };
  90
  91
  92 /* Type to represent a port.  */
  93 typedef uint16_t in_port_t;
  94
  95 /* Standard well-known ports.  */
  96 enum
  97   {
  98     IPPORT_ECHO = 7,            /* Echo service.  */
  99     IPPORT_DISCARD = 9,         /* Discard transmissions service.  */
 100     IPPORT_SYSTAT = 11,         /* System status service.  */
 101     IPPORT_DAYTIME = 13,        /* Time of day service.  */
 102     IPPORT_NETSTAT = 15,        /* Network status service.  */
 103     IPPORT_FTP = 21,            /* File Transfer Protocol.  */
 104     IPPORT_TELNET = 23,         /* Telnet protocol.  */
 105     IPPORT_SMTP = 25,           /* Simple Mail Transfer Protocol.  */
 106     IPPORT_TIMESERVER = 37,     /* Timeserver service.  */
 107     IPPORT_NAMESERVER = 42,     /* Domain Name Service.  */
 108     IPPORT_WHOIS = 43,          /* Internet Whois service.  */
 109     IPPORT_MTP = 57,
 110
 111     IPPORT_TFTP = 69,           /* Trivial File Transfer Protocol.  */
 112     IPPORT_RJE = 77,
 113     IPPORT_FINGER = 79,         /* Finger service.  */
 114     IPPORT_TTYLINK = 87,
 115     IPPORT_SUPDUP = 95,         /* SUPDUP protocol.  */
 116
 117
 118     IPPORT_EXECSERVER = 512,    /* execd service.  */
 119     IPPORT_LOGINSERVER = 513,   /* rlogind service.  */
 120     IPPORT_CMDSERVER = 514,
 121     IPPORT_EFSSERVER = 520,
 122
 123     /* UDP ports.  */
 124     IPPORT_BIFFUDP = 512,
 125     IPPORT_WHOSERVER = 513,
 126     IPPORT_ROUTESERVER = 520,
 127
 128     /* Ports less than this value are reserved for privileged processes.  */
 129     IPPORT_RESERVED = 1024,
 130
 131     /* Ports greater this value are reserved for (non-privileged) servers.  */
 132     IPPORT_USERRESERVED = 5000
 133   };
 134
 135
 136 /* Internet address.  */
 137 typedef uint32_t in_addr_t;
 138 struct in_addr
 139   {
 140     in_addr_t s_addr;
 141   };
 142
 143
 144 /* Definitions of the bits in an Internet address integer.
 145
 146    On subnets, host and network parts are found according to
 147    the subnet mask, not these masks.  */
 148
 149 #define IN_CLASSA(a)            ((((in_addr_t)(a)) & 0x80000000) == 0)
 150 #define IN_CLASSA_NET           0xff000000
 151 #define IN_CLASSA_NSHIFT        24
 152 #define IN_CLASSA_HOST          (0xffffffff & ~IN_CLASSA_NET)
 153 #define IN_CLASSA_MAX           128
 154
 155 #define IN_CLASSB(a)            ((((in_addr_t)(a)) & 0xc0000000) == 0x80000000)
 156 #define IN_CLASSB_NET           0xffff0000
 157 #define IN_CLASSB_NSHIFT        16
 158 #define IN_CLASSB_HOST          (0xffffffff & ~IN_CLASSB_NET)
 159 #define IN_CLASSB_MAX           65536
 160
 161 #define IN_CLASSC(a)            ((((in_addr_t)(a)) & 0xe0000000) == 0xc0000000)
 162 #define IN_CLASSC_NET           0xffffff00
 163 #define IN_CLASSC_NSHIFT        8
 164 #define IN_CLASSC_HOST          (0xffffffff & ~IN_CLASSC_NET)
 165
 166 #define IN_CLASSD(a)            ((((in_addr_t)(a)) & 0xf0000000) == 0xe0000000)
 167 #define IN_MULTICAST(a)         IN_CLASSD(a)
 168
 169 #define IN_EXPERIMENTAL(a)      ((((in_addr_t)(a)) & 0xe0000000) == 0xe0000000)
 170 #define IN_BADCLASS(a)          ((((in_addr_t)(a)) & 0xf0000000) == 0xf0000000)
 171
 172 /* Address to accept any incoming messages.  */
 173 #define INADDR_ANY              ((in_addr_t) 0x00000000)
 174 /* Address to send to all hosts.  */
 175 #define INADDR_BROADCAST        ((in_addr_t) 0xffffffff)
 176 /* Address indicating an error return.  */
 177 #define INADDR_NONE             ((in_addr_t) 0xffffffff)
 178
 179 /* Network number for local host loopback.  */
 180 #define IN_LOOPBACKNET          127
 181 /* Address to loopback in software to local host.  */
 182 #ifndef INADDR_LOOPBACK
 183 # define INADDR_LOOPBACK        ((in_addr_t) 0x7f000001) /* Inet 127.0.0.1.  */
 184 #endif
 185
 186 /* Defines for Multicast INADDR.  */
 187 #define INADDR_UNSPEC_GROUP     ((in_addr_t) 0xe0000000) /* 224.0.0.0 */
 188 #define INADDR_ALLHOSTS_GROUP   ((in_addr_t) 0xe0000001) /* 224.0.0.1 */
 189 #define INADDR_ALLRTRS_GROUP    ((in_addr_t) 0xe0000002) /* 224.0.0.2 */
 190 #define INADDR_MAX_LOCAL_GROUP  ((in_addr_t) 0xe00000ff) /* 224.0.0.255 */
 191
 192
 193 /* IPv6 address */
 194 struct in6_addr
 195   {
 196     union
 197       {
 198         uint8_t u6_addr8[16];
 199         uint16_t u6_addr16[8];
 200         uint32_t u6_addr32[4];
 201       } in6_u;
 202 #define s6_addr                 in6_u.u6_addr8
 203 #define s6_addr16               in6_u.u6_addr16
 204 #define s6_addr32               in6_u.u6_addr32
 205   };
 206
 207 extern const struct in6_addr in6addr_any;        /* :: */
 208 extern const struct in6_addr in6addr_loopback;   /* ::1 */
 209 #define IN6ADDR_ANY_INIT { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } } }
 210 #define IN6ADDR_LOOPBACK_INIT { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 } } }
 211
 212 #define INET_ADDRSTRLEN 16
 213 #define INET6_ADDRSTRLEN 46
 214
 215
 216 /* Structure describing an Internet socket address.  */
 217 struct sockaddr_in
 218   {
 219     __SOCKADDR_COMMON (sin_);
 220     in_port_t sin_port;                 /* Port number.  */
 221     struct in_addr sin_addr;            /* Internet address.  */
 222
 223     /* Pad to size of `struct sockaddr'.  */
 224     unsigned char sin_zero[sizeof (struct sockaddr) -
 225                            __SOCKADDR_COMMON_SIZE -
 226                            sizeof (in_port_t) -
 227                            sizeof (struct in_addr)];
 228   };
 229
 230 /* Ditto, for IPv6.  */
 231 struct sockaddr_in6
 232   {
 233     __SOCKADDR_COMMON (sin6_);
 234     in_port_t sin6_port;        /* Transport layer port # */
 235     uint32_t sin6_flowinfo;     /* IPv6 flow information */
 236     struct in6_addr sin6_addr;  /* IPv6 address */
 237     uint32_t sin6_scope_id;     /* IPv6 scope-id */
 238   };
 239
 240
 241 /* IPv4 multicast request.  */
 242 struct ip_mreq
 243   {
 244     /* IP multicast address of group.  */
 245     struct in_addr imr_multiaddr;
 246
 247     /* Local IP address of interface.  */
 248     struct in_addr imr_interface;
 249   };
 250
 251 struct ip_mreq_source
 252   {
 253     /* IP multicast address of group.  */
 254     struct in_addr imr_multiaddr;
 255
 256     /* IP address of source.  */
 257     struct in_addr imr_interface;
 258
 259     /* IP address of interface.  */
 260     struct in_addr imr_sourceaddr;
 261   };
 262
 263 /* Likewise, for IPv6.  */
 264 struct ipv6_mreq
 265   {
 266     /* IPv6 multicast address of group */
 267     struct in6_addr ipv6mr_multiaddr;
 268
 269     /* local interface */
 270     unsigned int ipv6mr_interface;
 271   };
 272
 273
 274 /* Multicast group request.  */
 275 struct group_req
 276   {
 277     /* Interface index.  */
 278     uint32_t gr_interface;
 279
 280     /* Group address.  */
 281     struct sockaddr_storage gr_group;
 282   };
 283
 284 struct group_source_req
 285   {
 286     /* Interface index.  */
 287     uint32_t gsr_interface;
 288
 289     /* Group address.  */
 290     struct sockaddr_storage gsr_group;
 291
 292     /* Source address.  */
 293     struct sockaddr_storage gsr_source;
 294   };
 295
 296
 297 /* Full-state filter operations.  */
 298 struct ip_msfilter
 299   {
 300     /* IP multicast address of group.  */
 301     struct in_addr imsf_multiaddr;
 302
 303     /* Local IP address of interface.  */
 304     struct in_addr imsf_interface;
 305
 306     /* Filter mode.  */
 307     uint32_t imsf_fmode;
 308
 309     /* Number of source addresses.  */
 310     uint32_t imsf_numsrc;
 311     /* Source addresses.  */
 312     struct in_addr imsf_slist[1];
 313   };
 314
 315 #define IP_MSFILTER_SIZE(numsrc) (sizeof (struct ip_msfilter) \
 316                                   - sizeof (struct in_addr)                   \
 317                                   + (numsrc) * sizeof (struct in_addr))
 318
 319 struct group_filter
 320   {
 321     /* Interface index.  */
 322     uint32_t gf_interface;
 323
 324     /* Group address.  */
 325     struct sockaddr_storage gf_group;
 326
 327     /* Filter mode.  */
 328     uint32_t gf_fmode;
 329
 330     /* Number of source addresses.  */
 331     uint32_t gf_numsrc;
 332     /* Source addresses.  */
 333     struct sockaddr_storage gf_slist[1];
 334 };
 335
 336 #define GROUP_FILTER_SIZE(numsrc) (sizeof (struct group_filter) \
 337                                    - sizeof (struct sockaddr_storage)         \
 338                                    + ((numsrc)                                \
 339                                       * sizeof (struct sockaddr_storage)))
 340
 341
 342 /* Get system-specific definitions.  */
 343 #include <bits/in.h>
 344
 345 /* Functions to convert between host and network byte order.
 346
 347    Please note that these functions normally take `unsigned long int' or
 348    `unsigned short int' values as arguments and also return them.  But
 349    this was a short-sighted decision since on different systems the types
 350    may have different representations but the values are always the same.  */
 351
 352 extern uint32_t ntohl (uint32_t __netlong) __THROW __attribute__ ((__const__));
 353 extern uint16_t ntohs (uint16_t __netshort)
 354      __THROW __attribute__ ((__const__));
 355 extern uint32_t htonl (uint32_t __hostlong)
 356      __THROW __attribute__ ((__const__));
 357 extern uint16_t htons (uint16_t __hostshort)
 358      __THROW __attribute__ ((__const__));
 359
 360 #include <endian.h>
 361
 362 /* Get machine dependent optimized versions of byte swapping functions.  */
 363 #include <bits/byteswap.h>
 364
 365 #ifdef __OPTIMIZE__
 366 /* We can optimize calls to the conversion functions.  Either nothing has
 367    to be done or we are using directly the byte-swapping functions which
 368    often can be inlined.  */
 369 # if __BYTE_ORDER == __BIG_ENDIAN
 370 /* The host byte order is the same as network byte order,
 371    so these functions are all just identity.  */
 372 # define ntohl(x)       (x)
 373 # define ntohs(x)       (x)
 374 # define htonl(x)       (x)
 375 # define htons(x)       (x)
 376 # else
 377 #  if __BYTE_ORDER == __LITTLE_ENDIAN
 378 #   define ntohl(x)     __bswap_32 (x)
 379 #   define ntohs(x)     __bswap_16 (x)
 380 #   define htonl(x)     __bswap_32 (x)
 381 #   define htons(x)     __bswap_16 (x)
 382 #  endif
 383 # endif
 384 #endif
 385
 386 #define IN6_IS_ADDR_UNSPECIFIED(a) \
 387         (((__const uint32_t *) (a))[0] == 0                                   \
 388          && ((__const uint32_t *) (a))[1] == 0                                \
 389          && ((__const uint32_t *) (a))[2] == 0                                \
 390          && ((__const uint32_t *) (a))[3] == 0)
 391
 392 #define IN6_IS_ADDR_LOOPBACK(a) \
 393         (((__const uint32_t *) (a))[0] == 0                                   \
 394          && ((__const uint32_t *) (a))[1] == 0                                \
 395          && ((__const uint32_t *) (a))[2] == 0                                \
 396          && ((__const uint32_t *) (a))[3] == htonl (1))
 397
 398 #define IN6_IS_ADDR_MULTICAST(a) (((__const uint8_t *) (a))[0] == 0xff)
 399
 400 #define IN6_IS_ADDR_LINKLOCAL(a) \
 401         ((((__const uint32_t *) (a))[0] & htonl (0xffc00000))                 \
 402          == htonl (0xfe800000))
 403
 404 #define IN6_IS_ADDR_SITELOCAL(a) \
 405         ((((__const uint32_t *) (a))[0] & htonl (0xffc00000))                 \
 406          == htonl (0xfec00000))
 407
 408 #define IN6_IS_ADDR_V4MAPPED(a) \
 409         ((((__const uint32_t *) (a))[0] == 0)                                 \
 410          && (((__const uint32_t *) (a))[1] == 0)                              \
 411          && (((__const uint32_t *) (a))[2] == htonl (0xffff)))
 412
 413 #define IN6_IS_ADDR_V4COMPAT(a) \
 414         ((((__const uint32_t *) (a))[0] == 0)                                 \
 415          && (((__const uint32_t *) (a))[1] == 0)                              \
 416          && (((__const uint32_t *) (a))[2] == 0)                              \
 417          && (ntohl (((__const uint32_t *) (a))[3]) > 1))
 418
 419 #define IN6_ARE_ADDR_EQUAL(a,b) \
 420         ((((__const uint32_t *) (a))[0] == ((__const uint32_t *) (b))[0])     \
 421          && (((__const uint32_t *) (a))[1] == ((__const uint32_t *) (b))[1])  \
 422          && (((__const uint32_t *) (a))[2] == ((__const uint32_t *) (b))[2])  \
 423          && (((__const uint32_t *) (a))[3] == ((__const uint32_t *) (b))[3]))
 424
 425 /* Bind socket to a privileged IP port.  */
 426 extern int bindresvport (int __sockfd, struct sockaddr_in *__sock_in) __THROW;
 427
 428 /* The IPv6 version of this function.  */
 429 extern int bindresvport6 (int __sockfd, struct sockaddr_in6 *__sock_in)
 430      __THROW;
 431
 432
 433 #define IN6_IS_ADDR_MC_NODELOCAL(a) \
 434         (IN6_IS_ADDR_MULTICAST(a)                                             \
 435          && ((((__const uint8_t *) (a))[1] & 0xf) == 0x1))
 436
 437 #define IN6_IS_ADDR_MC_LINKLOCAL(a) \
 438         (IN6_IS_ADDR_MULTICAST(a)                                             \
 439          && ((((__const uint8_t *) (a))[1] & 0xf) == 0x2))
 440
 441 #define IN6_IS_ADDR_MC_SITELOCAL(a) \
 442         (IN6_IS_ADDR_MULTICAST(a)                                             \
 443          && ((((__const uint8_t *) (a))[1] & 0xf) == 0x5))
 444
 445 #define IN6_IS_ADDR_MC_ORGLOCAL(a) \
 446         (IN6_IS_ADDR_MULTICAST(a)                                             \
 447          && ((((__const uint8_t *) (a))[1] & 0xf) == 0x8))
 448
 449 #define IN6_IS_ADDR_MC_GLOBAL(a) \
 450         (IN6_IS_ADDR_MULTICAST(a)                                             \
 451          && ((((__const uint8_t *) (a))[1] & 0xf) == 0xe))
 452
 453 /* IPv6 packet information.  */
 454 struct in6_pktinfo
 455   {
 456     struct in6_addr ipi6_addr;  /* src/dst IPv6 address */
 457     unsigned int ipi6_ifindex;  /* send/recv interface index */
 458   };
 459
 460 /* IPv6 MTU information.  */
 461 struct ip6_mtuinfo
 462   {
 463     struct sockaddr_in6 ip6m_addr; /* dst address including zone ID */
 464     uint32_t ip6m_mtu;             /* path MTU in host byte order */
 465   };
 466
 467
 468 #ifdef __USE_GNU
 469 /* Obsolete hop-by-hop and Destination Options Processing (RFC 2292).  */
 470 extern int inet6_option_space (int __nbytes)
 471      __THROW __attribute_deprecated__;
 472 extern int inet6_option_init (void *__bp, struct cmsghdr **__cmsgp,
 473                               int __type) __THROW __attribute_deprecated__;
 474 extern int inet6_option_append (struct cmsghdr *__cmsg,
 475                                 __const uint8_t *__typep, int __multx,
 476                                 int __plusy) __THROW __attribute_deprecated__;
 477 extern uint8_t *inet6_option_alloc (struct cmsghdr *__cmsg, int __datalen,
 478                                     int __multx, int __plusy)
 479      __THROW __attribute_deprecated__;
 480 extern int inet6_option_next (__const struct cmsghdr *__cmsg,
 481                               uint8_t **__tptrp)
 482      __THROW __attribute_deprecated__;
 483 extern int inet6_option_find (__const struct cmsghdr *__cmsg,
 484                               uint8_t **__tptrp, int __type)
 485      __THROW __attribute_deprecated__;
 486
 487
 488 /* Hop-by-Hop and Destination Options Processing (RFC 3542).  */
 489 extern int inet6_opt_init (void *__extbuf, socklen_t __extlen) __THROW;
 490 extern int inet6_opt_append (void *__extbuf, socklen_t __extlen, int __offset,
 491                              uint8_t __type, socklen_t __len, uint8_t __align,
 492                              void **__databufp) __THROW;
 493 extern int inet6_opt_finish (void *__extbuf, socklen_t __extlen, int __offset)
 494      __THROW;
 495 extern int inet6_opt_set_val (void *__databuf, int __offset, void *__val,
 496                               socklen_t __vallen) __THROW;
 497 extern int inet6_opt_next (void *__extbuf, socklen_t __extlen, int __offset,
 498                            uint8_t *__typep, socklen_t *__lenp,
 499                            void **__databufp) __THROW;
 500 extern int inet6_opt_find (void *__extbuf, socklen_t __extlen, int __offset,
 501                            uint8_t __type, socklen_t *__lenp,
 502                            void **__databufp) __THROW;
 503 extern int inet6_opt_get_val (void *__databuf, int __offset, void *__val,
 504                               socklen_t __vallen) __THROW;
 505
 506
 507 /* Routing Header Option (RFC 3542).  */
 508 extern socklen_t inet6_rth_space (int __type, int __segments) __THROW;
 509 extern void *inet6_rth_init (void *__bp, socklen_t __bp_len, int __type,
 510                              int __segments) __THROW;
 511 extern int inet6_rth_add (void *__bp, __const struct in6_addr *__addr) __THROW;
 512 extern int inet6_rth_reverse (__const void *__in, void *__out) __THROW;
 513 extern int inet6_rth_segments (__const void *__bp) __THROW;
 514 extern struct in6_addr *inet6_rth_getaddr (__const void *__bp, int __index)
 515      __THROW;
 516
 517
 518 /* Multicast source filter support.  */
 519
 520 /* Get IPv4 source filter.  */
 521 extern int getipv4sourcefilter (int __s, struct in_addr __interface_addr,
 522                                 struct in_addr __group, uint32_t *__fmode,
 523                                 uint32_t *__numsrc, struct in_addr *__slist)
 524      __THROW;
 525
 526 /* Set IPv4 source filter.  */
 527 extern int setipv4sourcefilter (int __s, struct in_addr __interface_addr,
 528                                 struct in_addr __group, uint32_t __fmode,
 529                                 uint32_t __numsrc,
 530                                 __const struct in_addr *__slist)
 531      __THROW;
 532
 533
 534 /* Get source filter.  */
 535 extern int getsourcefilter (int __s, uint32_t __interface_addr,
 536                             __const struct sockaddr *__group,
 537                             socklen_t __grouplen, uint32_t *__fmode,
 538                             uint32_t *__numsrc,
 539                             struct sockaddr_storage *__slist) __THROW;
 540
 541 /* Set source filter.  */
 542 extern int setsourcefilter (int __s, uint32_t __interface_addr,
 543                             __const struct sockaddr *__group,
 544                             socklen_t __grouplen, uint32_t __fmode,
 545                             uint32_t __numsrc,
 546                             __const struct sockaddr_storage *__slist) __THROW;
 547 #endif  /* use GNU */
 548
 549 __END_DECLS
 550
 551 #endif  /* netinet/in.h */