bsd/netinet/in.h

   1 /*
   2  * Copyright (c) 2000-2017 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * Copyright (c) 1982, 1986, 1990, 1993
  30  *      The Regents of the University of California.  All rights reserved.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by the University of
  43  *      California, Berkeley and its contributors.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  *
  60  *      @(#)in.h        8.3 (Berkeley) 1/3/94
  61  * $FreeBSD: src/sys/netinet/in.h,v 1.48.2.2 2001/04/21 14:53:06 ume Exp $
  62  */
  63
  64 #ifndef _NETINET_IN_H_
  65 #define _NETINET_IN_H_
  66 #include <sys/appleapiopts.h>
  67 #include <sys/_types.h>
  68 #include <stdint.h>             /* uint(8|16|32)_t */
  69
  70 #ifndef KERNEL
  71 #include <Availability.h>
  72 #endif
  73
  74 #include <sys/_types/_in_addr_t.h>
  75
  76 #include <sys/_types/_in_port_t.h>
  77
  78 /*
  79  * POSIX 1003.1-2003
  80  * "Inclusion of the <netinet/in.h> header may also make visible all
  81  *  symbols from <inttypes.h> and <sys/socket.h>".
  82  */
  83 #include <sys/socket.h>
  84
  85 /*
  86  * The following two #includes insure htonl and family are defined
  87  */
  88 #include <machine/endian.h>
  89 #include <sys/_endian.h>
  90
  91 /*
  92  * Constants and structures defined by the internet system,
  93  * Per RFC 790, September 1981, and numerous additions.
  94  */
  95
  96 /*
  97  * Protocols (RFC 1700)
  98  */
  99 #define IPPROTO_IP              0               /* dummy for IP */
 100 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 101 #define IPPROTO_HOPOPTS 0               /* IP6 hop-by-hop options */
 102 #endif  /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
 103 #define IPPROTO_ICMP            1               /* control message protocol */
 104 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 105 #define IPPROTO_IGMP            2               /* group mgmt protocol */
 106 #define IPPROTO_GGP             3               /* gateway^2 (deprecated) */
 107 #define IPPROTO_IPV4            4               /* IPv4 encapsulation */
 108 #define IPPROTO_IPIP            IPPROTO_IPV4    /* for compatibility */
 109 #endif  /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
 110 #define IPPROTO_TCP             6               /* tcp */
 111 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 112 #define IPPROTO_ST              7               /* Stream protocol II */
 113 #define IPPROTO_EGP             8               /* exterior gateway protocol */
 114 #define IPPROTO_PIGP            9               /* private interior gateway */
 115 #define IPPROTO_RCCMON          10              /* BBN RCC Monitoring */
 116 #define IPPROTO_NVPII           11              /* network voice protocol*/
 117 #define IPPROTO_PUP             12              /* pup */
 118 #define IPPROTO_ARGUS           13              /* Argus */
 119 #define IPPROTO_EMCON           14              /* EMCON */
 120 #define IPPROTO_XNET            15              /* Cross Net Debugger */
 121 #define IPPROTO_CHAOS           16              /* Chaos*/
 122 #endif  /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
 123 #define IPPROTO_UDP             17              /* user datagram protocol */
 124 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 125 #define IPPROTO_MUX             18              /* Multiplexing */
 126 #define IPPROTO_MEAS            19              /* DCN Measurement Subsystems */
 127 #define IPPROTO_HMP             20              /* Host Monitoring */
 128 #define IPPROTO_PRM             21              /* Packet Radio Measurement */
 129 #define IPPROTO_IDP             22              /* xns idp */
 130 #define IPPROTO_TRUNK1          23              /* Trunk-1 */
 131 #define IPPROTO_TRUNK2          24              /* Trunk-2 */
 132 #define IPPROTO_LEAF1           25              /* Leaf-1 */
 133 #define IPPROTO_LEAF2           26              /* Leaf-2 */
 134 #define IPPROTO_RDP             27              /* Reliable Data */
 135 #define IPPROTO_IRTP            28              /* Reliable Transaction */
 136 #define IPPROTO_TP              29              /* tp-4 w/ class negotiation */
 137 #define IPPROTO_BLT             30              /* Bulk Data Transfer */
 138 #define IPPROTO_NSP             31              /* Network Services */
 139 #define IPPROTO_INP             32              /* Merit Internodal */
 140 #define IPPROTO_SEP             33              /* Sequential Exchange */
 141 #define IPPROTO_3PC             34              /* Third Party Connect */
 142 #define IPPROTO_IDPR            35              /* InterDomain Policy Routing */
 143 #define IPPROTO_XTP             36              /* XTP */
 144 #define IPPROTO_DDP             37              /* Datagram Delivery */
 145 #define IPPROTO_CMTP            38              /* Control Message Transport */
 146 #define IPPROTO_TPXX            39              /* TP++ Transport */
 147 #define IPPROTO_IL              40              /* IL transport protocol */
 148 #endif  /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
 149 #define         IPPROTO_IPV6            41              /* IP6 header */
 150 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 151 #define IPPROTO_SDRP            42              /* Source Demand Routing */
 152 #define         IPPROTO_ROUTING 43              /* IP6 routing header */
 153 #define         IPPROTO_FRAGMENT        44              /* IP6 fragmentation header */
 154 #define IPPROTO_IDRP            45              /* InterDomain Routing*/
 155 #define         IPPROTO_RSVP            46              /* resource reservation */
 156 #define IPPROTO_GRE             47              /* General Routing Encap. */
 157 #define IPPROTO_MHRP            48              /* Mobile Host Routing */
 158 #define IPPROTO_BHA             49              /* BHA */
 159 #define IPPROTO_ESP             50              /* IP6 Encap Sec. Payload */
 160 #define IPPROTO_AH              51              /* IP6 Auth Header */
 161 #define IPPROTO_INLSP           52              /* Integ. Net Layer Security */
 162 #define IPPROTO_SWIPE           53              /* IP with encryption */
 163 #define IPPROTO_NHRP            54              /* Next Hop Resolution */
 164 /* 55-57: Unassigned */
 165 #define IPPROTO_ICMPV6          58              /* ICMP6 */
 166 #define IPPROTO_NONE            59              /* IP6 no next header */
 167 #define IPPROTO_DSTOPTS         60              /* IP6 destination option */
 168 #define IPPROTO_AHIP            61              /* any host internal protocol */
 169 #define IPPROTO_CFTP            62              /* CFTP */
 170 #define IPPROTO_HELLO           63              /* "hello" routing protocol */
 171 #define IPPROTO_SATEXPAK        64              /* SATNET/Backroom EXPAK */
 172 #define IPPROTO_KRYPTOLAN       65              /* Kryptolan */
 173 #define IPPROTO_RVD             66              /* Remote Virtual Disk */
 174 #define IPPROTO_IPPC            67              /* Pluribus Packet Core */
 175 #define IPPROTO_ADFS            68              /* Any distributed FS */
 176 #define IPPROTO_SATMON          69              /* Satnet Monitoring */
 177 #define IPPROTO_VISA            70              /* VISA Protocol */
 178 #define IPPROTO_IPCV            71              /* Packet Core Utility */
 179 #define IPPROTO_CPNX            72              /* Comp. Prot. Net. Executive */
 180 #define IPPROTO_CPHB            73              /* Comp. Prot. HeartBeat */
 181 #define IPPROTO_WSN             74              /* Wang Span Network */
 182 #define IPPROTO_PVP             75              /* Packet Video Protocol */
 183 #define IPPROTO_BRSATMON        76              /* BackRoom SATNET Monitoring */
 184 #define IPPROTO_ND              77              /* Sun net disk proto (temp.) */
 185 #define IPPROTO_WBMON           78              /* WIDEBAND Monitoring */
 186 #define IPPROTO_WBEXPAK         79              /* WIDEBAND EXPAK */
 187 #define IPPROTO_EON             80              /* ISO cnlp */
 188 #define IPPROTO_VMTP            81              /* VMTP */
 189 #define IPPROTO_SVMTP           82              /* Secure VMTP */
 190 #define IPPROTO_VINES           83              /* Banyon VINES */
 191 #define IPPROTO_TTP             84              /* TTP */
 192 #define IPPROTO_IGP             85              /* NSFNET-IGP */
 193 #define IPPROTO_DGP             86              /* dissimilar gateway prot. */
 194 #define IPPROTO_TCF             87              /* TCF */
 195 #define IPPROTO_IGRP            88              /* Cisco/GXS IGRP */
 196 #define IPPROTO_OSPFIGP         89              /* OSPFIGP */
 197 #define IPPROTO_SRPC            90              /* Strite RPC protocol */
 198 #define IPPROTO_LARP            91              /* Locus Address Resoloution */
 199 #define IPPROTO_MTP             92              /* Multicast Transport */
 200 #define IPPROTO_AX25            93              /* AX.25 Frames */
 201 #define IPPROTO_IPEIP           94              /* IP encapsulated in IP */
 202 #define IPPROTO_MICP            95              /* Mobile Int.ing control */
 203 #define IPPROTO_SCCSP           96              /* Semaphore Comm. security */
 204 #define IPPROTO_ETHERIP         97              /* Ethernet IP encapsulation */
 205 #define IPPROTO_ENCAP           98              /* encapsulation header */
 206 #define IPPROTO_APES            99              /* any private encr. scheme */
 207 #define IPPROTO_GMTP            100             /* GMTP*/
 208 /* 101-254: Partly Unassigned */
 209 #define IPPROTO_PIM             103             /* Protocol Independent Mcast */
 210 #define IPPROTO_IPCOMP          108             /* payload compression (IPComp) */
 211 #define IPPROTO_PGM             113             /* PGM */
 212 #define IPPROTO_SCTP            132             /* SCTP */
 213 /* 255: Reserved */
 214 /* BSD Private, local use, namespace incursion */
 215 #define IPPROTO_DIVERT          254             /* divert pseudo-protocol */
 216 #endif  /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
 217 #define IPPROTO_RAW             255             /* raw IP packet */
 218
 219 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 220 #define IPPROTO_MAX             256
 221
 222 /* last return value of *_input(), meaning "all job for this pkt is done".  */
 223 #define IPPROTO_DONE            257
 224 #endif /* (_POSIX_C_SOURCE && !_DARWIN_C_SOURCE) */
 225
 226 /*
 227  * Local port number conventions:
 228  *
 229  * When a user does a bind(2) or connect(2) with a port number of zero,
 230  * a non-conflicting local port address is chosen.
 231  * The default range is IPPORT_RESERVED through
 232  * IPPORT_USERRESERVED, although that is settable by sysctl.
 233  *
 234  * A user may set the IPPROTO_IP option IP_PORTRANGE to change this
 235  * default assignment range.
 236  *
 237  * The value IP_PORTRANGE_DEFAULT causes the default behavior.
 238  *
 239  * The value IP_PORTRANGE_HIGH changes the range of candidate port numbers
 240  * into the "high" range.  These are reserved for client outbound connections
 241  * which do not want to be filtered by any firewalls.
 242  *
 243  * The value IP_PORTRANGE_LOW changes the range to the "low" are
 244  * that is (by convention) restricted to privileged processes.  This
 245  * convention is based on "vouchsafe" principles only.  It is only secure
 246  * if you trust the remote host to restrict these ports.
 247  *
 248  * The default range of ports and the high range can be changed by
 249  * sysctl(3).  (net.inet.ip.port{hi,low}{first,last}_auto)
 250  *
 251  * Changing those values has bad security implications if you are
 252  * using a a stateless firewall that is allowing packets outside of that
 253  * range in order to allow transparent outgoing connections.
 254  *
 255  * Such a firewall configuration will generally depend on the use of these
 256  * default values.  If you change them, you may find your Security
 257  * Administrator looking for you with a heavy object.
 258  *
 259  * For a slightly more orthodox text view on this:
 260  *
 261  *            ftp://ftp.isi.edu/in-notes/iana/assignments/port-numbers
 262  *
 263  *    port numbers are divided into three ranges:
 264  *
 265  *                0 -  1023 Well Known Ports
 266  *             1024 - 49151 Registered Ports
 267  *            49152 - 65535 Dynamic and/or Private Ports
 268  *
 269  */
 270
 271 #define __DARWIN_IPPORT_RESERVED        1024
 272
 273 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 274 /*
 275  * Ports < IPPORT_RESERVED are reserved for
 276  * privileged processes (e.g. root).         (IP_PORTRANGE_LOW)
 277  * Ports > IPPORT_USERRESERVED are reserved
 278  * for servers, not necessarily privileged.  (IP_PORTRANGE_DEFAULT)
 279  */
 280 #ifndef IPPORT_RESERVED
 281 #define IPPORT_RESERVED         __DARWIN_IPPORT_RESERVED
 282 #endif
 283 #define IPPORT_USERRESERVED     5000
 284
 285 /*
 286  * Default local port range to use by setting IP_PORTRANGE_HIGH
 287  */
 288 #define IPPORT_HIFIRSTAUTO      49152
 289 #define IPPORT_HILASTAUTO       65535
 290
 291 /*
 292  * Scanning for a free reserved port return a value below IPPORT_RESERVED,
 293  * but higher than IPPORT_RESERVEDSTART.  Traditionally the start value was
 294  * 512, but that conflicts with some well-known-services that firewalls may
 295  * have a fit if we use.
 296  */
 297 #define IPPORT_RESERVEDSTART    600
 298 #endif  /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
 299
 300 /*
 301  * Internet address (a structure for historical reasons)
 302  */
 303 struct in_addr {
 304         in_addr_t s_addr;
 305 };
 306
 307 /*
 308  * Definitions of bits in internet address integers.
 309  * On subnets, the decomposition of addresses to host and net parts
 310  * is done according to subnet mask, not the masks here.
 311  */
 312 #define INADDR_ANY              (u_int32_t)0x00000000
 313 #define INADDR_BROADCAST        (u_int32_t)0xffffffff   /* must be masked */
 314
 315 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 316 #define IN_CLASSA(i)            (((u_int32_t)(i) & 0x80000000) == 0)
 317 #define IN_CLASSA_NET           0xff000000
 318 #define IN_CLASSA_NSHIFT        24
 319 #define IN_CLASSA_HOST          0x00ffffff
 320 #define IN_CLASSA_MAX           128
 321
 322 #define IN_CLASSB(i)            (((u_int32_t)(i) & 0xc0000000) == 0x80000000)
 323 #define IN_CLASSB_NET           0xffff0000
 324 #define IN_CLASSB_NSHIFT        16
 325 #define IN_CLASSB_HOST          0x0000ffff
 326 #define IN_CLASSB_MAX           65536
 327
 328 #define IN_CLASSC(i)            (((u_int32_t)(i) & 0xe0000000) == 0xc0000000)
 329 #define IN_CLASSC_NET           0xffffff00
 330 #define IN_CLASSC_NSHIFT        8
 331 #define IN_CLASSC_HOST          0x000000ff
 332
 333 #define IN_CLASSD(i)            (((u_int32_t)(i) & 0xf0000000) == 0xe0000000)
 334 #define IN_CLASSD_NET           0xf0000000      /* These ones aren't really */
 335 #define IN_CLASSD_NSHIFT        28              /* net and host fields, but */
 336 #define IN_CLASSD_HOST          0x0fffffff      /* routing needn't know.    */
 337 #define IN_MULTICAST(i)         IN_CLASSD(i)
 338
 339 #define IN_EXPERIMENTAL(i)      (((u_int32_t)(i) & 0xf0000000) == 0xf0000000)
 340 #define IN_BADCLASS(i)          (((u_int32_t)(i) & 0xf0000000) == 0xf0000000)
 341
 342 #define INADDR_LOOPBACK         (u_int32_t)0x7f000001
 343
 344 #ifndef KERNEL
 345 #define INADDR_NONE             0xffffffff              /* -1 return */
 346 #endif
 347
 348 #define INADDR_UNSPEC_GROUP     (u_int32_t)0xe0000000   /* 224.0.0.0 */
 349 #define INADDR_ALLHOSTS_GROUP   (u_int32_t)0xe0000001   /* 224.0.0.1 */
 350 #define INADDR_ALLRTRS_GROUP    (u_int32_t)0xe0000002   /* 224.0.0.2 */
 351 #define INADDR_ALLRPTS_GROUP    (u_int32_t)0xe0000016   /* 224.0.0.22, IGMPv3 */
 352 #define INADDR_CARP_GROUP       (u_int32_t)0xe0000012   /* 224.0.0.18 */
 353 #define INADDR_PFSYNC_GROUP     (u_int32_t)0xe00000f0   /* 224.0.0.240 */
 354 #define INADDR_ALLMDNS_GROUP    (u_int32_t)0xe00000fb   /* 224.0.0.251 */
 355 #define INADDR_MAX_LOCAL_GROUP  (u_int32_t)0xe00000ff   /* 224.0.0.255 */
 356
 357 #ifdef __APPLE__
 358 #define IN_LINKLOCALNETNUM      (u_int32_t)0xA9FE0000 /* 169.254.0.0 */
 359 #define IN_LINKLOCAL(i)         (((u_int32_t)(i) & IN_CLASSB_NET) == IN_LINKLOCALNETNUM)
 360 #define IN_LOOPBACK(i)          (((u_int32_t)(i) & 0xff000000) == 0x7f000000)
 361 #define IN_ZERONET(i)           (((u_int32_t)(i) & 0xff000000) == 0)
 362
 363 #define IN_PRIVATE(i)   ((((u_int32_t)(i) & 0xff000000) == 0x0a000000) || \
 364                          (((u_int32_t)(i) & 0xfff00000) == 0xac100000) || \
 365                          (((u_int32_t)(i) & 0xffff0000) == 0xc0a80000))
 366
 367 #ifdef PRIVATE
 368 #define IN_SHARED_ADDRESS_SPACE(i) ((((u_int32_t)(i)) & (u_int32_t)0xffc00000) \
 369                                     == (u_int32_t)0x64400000)
 370
 371 #define IN_DS_LITE(i) ((((u_int32_t)(i)) & (u_int32_t)0xfffffff8) == (u_int32_t)0xc0000000)
 372
 373 #define IN_6TO4_RELAY_ANYCAST(i) ((((u_int32_t)(i)) & (u_int32_t)IN_CLASSC_NET) == (u_int32_t)0xc0586300)
 374 #endif
 375
 376 #define IN_LOCAL_GROUP(i)       (((u_int32_t)(i) & 0xffffff00) == 0xe0000000)
 377
 378 #define IN_ANY_LOCAL(i)         (IN_LINKLOCAL(i) || IN_LOCAL_GROUP(i))
 379 #endif /* __APPLE__ */
 380
 381 #define IN_LOOPBACKNET          127                     /* official! */
 382 #endif  /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
 383
 384 /*
 385  * Socket address, internet style.
 386  */
 387 struct sockaddr_in {
 388         __uint8_t       sin_len;
 389         sa_family_t     sin_family;
 390         in_port_t       sin_port;
 391         struct  in_addr sin_addr;
 392         char            sin_zero[8];
 393 };
 394
 395 #ifdef PRIVATE
 396 /*
 397  * sockaddr_in with scope ID field; this is used internally to keep
 398  * track of scoped route entries in the routing table.  The fact that
 399  * such a value is embedded in the structure is an artifact of the
 400  * current implementation which could change in future.
 401  */
 402 struct sockaddr_inifscope {
 403         __uint8_t       sin_len;
 404         sa_family_t     sin_family;
 405         in_port_t       sin_port;
 406         struct  in_addr sin_addr;
 407         /*
 408          * To avoid possible conflict with an overlaid sockaddr_inarp
 409          * having sin_other set to SIN_PROXY, we use the first 4-bytes
 410          * of sin_zero since sin_srcaddr is one of the unused fields
 411          * in sockaddr_inarp.
 412          */
 413         union {
 414                 char    sin_zero[8];
 415                 struct {
 416                         __uint32_t      ifscope;
 417                 } _in_index;
 418         } un;
 419 #define sin_scope_id    un._in_index.ifscope
 420 };
 421
 422 #endif /* PRIVATE */
 423
 424 #define INET_ADDRSTRLEN                 16
 425
 426 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 427 /*
 428  * Structure used to describe IP options.
 429  * Used to store options internally, to pass them to a process,
 430  * or to restore options retrieved earlier.
 431  * The ip_dst is used for the first-hop gateway when using a source route
 432  * (this gets put into the header proper).
 433  */
 434 struct ip_opts {
 435         struct  in_addr ip_dst;         /* first hop, 0 w/o src rt */
 436         char    ip_opts[40];            /* actually variable in size */
 437 };
 438
 439 /*
 440  * Options for use with [gs]etsockopt at the IP level.
 441  * First word of comment is data type; bool is stored in int.
 442  */
 443 #define IP_OPTIONS              1    /* buf/ip_opts; set/get IP options */
 444 #define IP_HDRINCL              2    /* int; header is included with data */
 445 #define IP_TOS                  3    /* int; IP type of service and preced. */
 446 #define IP_TTL                  4    /* int; IP time to live */
 447 #define IP_RECVOPTS             5    /* bool; receive all IP opts w/dgram */
 448 #define IP_RECVRETOPTS          6    /* bool; receive IP opts for response */
 449 #define IP_RECVDSTADDR          7    /* bool; receive IP dst addr w/dgram */
 450 #define IP_RETOPTS              8    /* ip_opts; set/get IP options */
 451 #define IP_MULTICAST_IF         9    /* u_char; set/get IP multicast i/f  */
 452 #define IP_MULTICAST_TTL        10   /* u_char; set/get IP multicast ttl */
 453 #define IP_MULTICAST_LOOP       11   /* u_char; set/get IP multicast loopback */
 454 #define IP_ADD_MEMBERSHIP       12   /* ip_mreq; add an IP group membership */
 455 #define IP_DROP_MEMBERSHIP      13   /* ip_mreq; drop an IP group membership */
 456 #define IP_MULTICAST_VIF        14   /* set/get IP mcast virt. iface */
 457 #define IP_RSVP_ON              15   /* enable RSVP in kernel */
 458 #define IP_RSVP_OFF             16   /* disable RSVP in kernel */
 459 #define IP_RSVP_VIF_ON          17   /* set RSVP per-vif socket */
 460 #define IP_RSVP_VIF_OFF         18   /* unset RSVP per-vif socket */
 461 #define IP_PORTRANGE            19   /* int; range to choose for unspec port */
 462 #define IP_RECVIF               20   /* bool; receive reception if w/dgram */
 463 /* for IPSEC */
 464 #define IP_IPSEC_POLICY         21   /* int; set/get security policy */
 465 #define IP_FAITH                22   /* deprecated */
 466 #ifdef __APPLE__
 467 #define IP_STRIPHDR             23   /* bool: drop receive of raw IP header */
 468 #endif
 469 #define IP_RECVTTL              24   /* bool; receive reception TTL w/dgram */
 470 #define IP_BOUND_IF             25   /* int; set/get bound interface */
 471 #define IP_PKTINFO              26   /* get pktinfo on recv socket, set src on sent dgram  */
 472 #define IP_RECVPKTINFO          IP_PKTINFO      /* receive pktinfo w/dgram */
 473 #define IP_RECVTOS              27   /* bool; receive IP TOS w/dgram */
 474
 475 #define IP_FW_ADD               40   /* add a firewall rule to chain */
 476 #define IP_FW_DEL               41   /* delete a firewall rule from chain */
 477 #define IP_FW_FLUSH             42   /* flush firewall rule chain */
 478 #define IP_FW_ZERO              43   /* clear single/all firewall counter(s) */
 479 #define IP_FW_GET               44   /* get entire firewall rule chain */
 480 #define IP_FW_RESETLOG          45   /* reset logging counters */
 481
 482 /* These older firewall socket option codes are maintained for backward compatibility. */
 483 #define IP_OLD_FW_ADD           50   /* add a firewall rule to chain */
 484 #define IP_OLD_FW_DEL           51   /* delete a firewall rule from chain */
 485 #define IP_OLD_FW_FLUSH         52   /* flush firewall rule chain */
 486 #define IP_OLD_FW_ZERO          53   /* clear single/all firewall counter(s) */
 487 #define IP_OLD_FW_GET           54   /* get entire firewall rule chain */
 488 #define IP_NAT__XXX                     55   /* set/get NAT opts XXX Deprecated, do not use */
 489 #define IP_OLD_FW_RESETLOG      56   /* reset logging counters */
 490
 491 #define IP_DUMMYNET_CONFIGURE   60   /* add/configure a dummynet pipe */
 492 #define IP_DUMMYNET_DEL         61   /* delete a dummynet pipe from chain */
 493 #define IP_DUMMYNET_FLUSH       62   /* flush dummynet */
 494 #define IP_DUMMYNET_GET         64   /* get entire dummynet pipes */
 495
 496 #define IP_TRAFFIC_MGT_BACKGROUND       65   /* int*; get background IO flags; set background IO */
 497 #define IP_MULTICAST_IFINDEX    66   /* int*; set/get IP multicast i/f index */
 498
 499 /* IPv4 Source Filter Multicast API [RFC3678] */
 500 #define IP_ADD_SOURCE_MEMBERSHIP        70   /* join a source-specific group */
 501 #define IP_DROP_SOURCE_MEMBERSHIP       71   /* drop a single source */
 502 #define IP_BLOCK_SOURCE                 72   /* block a source */
 503 #define IP_UNBLOCK_SOURCE               73   /* unblock a source */
 504
 505 /* The following option is private; do not use it from user applications. */
 506 #define IP_MSFILTER                     74   /* set/get filter list */
 507
 508 /* Protocol Independent Multicast API [RFC3678] */
 509 #define MCAST_JOIN_GROUP                80   /* join an any-source group */
 510 #define MCAST_LEAVE_GROUP               81   /* leave all sources for group */
 511 #define MCAST_JOIN_SOURCE_GROUP         82   /* join a source-specific group */
 512 #define MCAST_LEAVE_SOURCE_GROUP        83   /* leave a single source */
 513 #define MCAST_BLOCK_SOURCE              84   /* block a source */
 514 #define MCAST_UNBLOCK_SOURCE            85   /* unblock a source */
 515
 516 #ifdef PRIVATE
 517 #define IP_FORCE_OUT_IFP        69   /* not implemented; use IP_BOUND_IF instead */
 518 #define IP_NO_IFT_CELLULAR      6969 /* for internal use only */
 519 #define IP_NO_IFT_PDP           IP_NO_IFT_CELLULAR /* deprecated */
 520 #define IP_OUT_IF               9696 /* for internal use only */
 521 #endif /* PRIVATE */
 522
 523 /*
 524  * Defaults and limits for options
 525  */
 526 #define IP_DEFAULT_MULTICAST_TTL  1     /* normally limit m'casts to 1 hop  */
 527 #define IP_DEFAULT_MULTICAST_LOOP 1     /* normally hear sends if a member  */
 528
 529 /*
 530  * The imo_membership vector for each socket is now dynamically allocated at
 531  * run-time, bounded by USHRT_MAX, and is reallocated when needed, sized
 532  * according to a power-of-two increment.
 533  */
 534 #define IP_MIN_MEMBERSHIPS      31
 535 #define IP_MAX_MEMBERSHIPS      4095
 536
 537 /*
 538  * Default resource limits for IPv4 multicast source filtering.
 539  * These may be modified by sysctl.
 540  */
 541 #define IP_MAX_GROUP_SRC_FILTER         512     /* sources per group */
 542 #define IP_MAX_SOCK_SRC_FILTER          128     /* sources per socket/group */
 543 #define IP_MAX_SOCK_MUTE_FILTER         128     /* XXX no longer used */
 544
 545 /*
 546  * Argument structure for IP_ADD_MEMBERSHIP and IP_DROP_MEMBERSHIP.
 547  */
 548 struct ip_mreq {
 549         struct  in_addr imr_multiaddr;  /* IP multicast address of group */
 550         struct  in_addr imr_interface;  /* local IP address of interface */
 551 };
 552
 553 /*
 554  * Modified argument structure for IP_MULTICAST_IF, obtained from Linux.
 555  * This is used to specify an interface index for multicast sends, as
 556  * the IPv4 legacy APIs do not support this (unless IP_SENDIF is available).
 557  */
 558 struct ip_mreqn {
 559         struct  in_addr imr_multiaddr;  /* IP multicast address of group */
 560         struct  in_addr imr_address;    /* local IP address of interface */
 561         int             imr_ifindex;    /* Interface index; cast to uint32_t */
 562 };
 563
 564 #pragma pack(4)
 565 /*
 566  * Argument structure for IPv4 Multicast Source Filter APIs. [RFC3678]
 567  */
 568 struct ip_mreq_source {
 569         struct  in_addr imr_multiaddr;  /* IP multicast address of group */
 570         struct  in_addr imr_sourceaddr; /* IP address of source */
 571         struct  in_addr imr_interface;  /* local IP address of interface */
 572 };
 573
 574 /*
 575  * Argument structures for Protocol-Independent Multicast Source
 576  * Filter APIs. [RFC3678]
 577  */
 578 struct group_req {
 579         uint32_t                gr_interface;   /* interface index */
 580         struct sockaddr_storage gr_group;       /* group address */
 581 };
 582
 583 struct group_source_req {
 584         uint32_t                gsr_interface;  /* interface index */
 585         struct sockaddr_storage gsr_group;      /* group address */
 586         struct sockaddr_storage gsr_source;     /* source address */
 587 };
 588
 589 #ifndef __MSFILTERREQ_DEFINED
 590 #define __MSFILTERREQ_DEFINED
 591 /*
 592  * The following structure is private; do not use it from user applications.
 593  * It is used to communicate IP_MSFILTER/IPV6_MSFILTER information between
 594  * the RFC 3678 libc functions and the kernel.
 595  */
 596 struct __msfilterreq {
 597         uint32_t                 msfr_ifindex;  /* interface index */
 598         uint32_t                 msfr_fmode;    /* filter mode for group */
 599         uint32_t                 msfr_nsrcs;    /* # of sources in msfr_srcs */
 600         uint32_t                __msfr_align;
 601         struct sockaddr_storage  msfr_group;    /* group address */
 602         struct sockaddr_storage *msfr_srcs;
 603 };
 604
 605 #ifdef BSD_KERNEL_PRIVATE
 606 struct __msfilterreq32 {
 607         uint32_t                 msfr_ifindex;  /* interface index */
 608         uint32_t                 msfr_fmode;    /* filter mode for group */
 609         uint32_t                 msfr_nsrcs;    /* # of sources in msfr_srcs */
 610         uint32_t                __msfr_align;
 611         struct sockaddr_storage  msfr_group;    /* group address */
 612         user32_addr_t            msfr_srcs;
 613 };
 614
 615 struct __msfilterreq64 {
 616         uint32_t                 msfr_ifindex;  /* interface index */
 617         uint32_t                 msfr_fmode;    /* filter mode for group */
 618         uint32_t                 msfr_nsrcs;    /* # of sources in msfr_srcs */
 619         uint32_t                __msfr_align;
 620         struct sockaddr_storage  msfr_group;    /* group address */
 621         user64_addr_t            msfr_srcs;
 622 };
 623 #endif /* BSD_KERNEL_PRIVATE */
 624 #endif /* __MSFILTERREQ_DEFINED */
 625
 626 #pragma pack()
 627 struct sockaddr;
 628
 629 #ifndef KERNEL
 630 /*
 631  * Advanced (Full-state) APIs [RFC3678]
 632  * The RFC specifies uint_t for the 6th argument to [sg]etsourcefilter().
 633  * We use uint32_t here to be consistent.
 634  */
 635 int     setipv4sourcefilter(int, struct in_addr, struct in_addr, uint32_t,
 636             uint32_t, struct in_addr *) __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_4_3);
 637 int     getipv4sourcefilter(int, struct in_addr, struct in_addr, uint32_t *,
 638             uint32_t *, struct in_addr *) __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_4_3);
 639 int     setsourcefilter(int, uint32_t, struct sockaddr *, socklen_t,
 640             uint32_t, uint32_t, struct sockaddr_storage *) __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_4_3);
 641 int     getsourcefilter(int, uint32_t, struct sockaddr *, socklen_t,
 642             uint32_t *, uint32_t *, struct sockaddr_storage *) __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_4_3);
 643 #endif
 644
 645 /*
 646  * Filter modes; also used to represent per-socket filter mode internally.
 647  */
 648 #define MCAST_UNDEFINED 0       /* fmode: not yet defined */
 649 #define MCAST_INCLUDE   1       /* fmode: include these source(s) */
 650 #define MCAST_EXCLUDE   2       /* fmode: exclude these source(s) */
 651
 652 /*
 653  * Argument for IP_PORTRANGE:
 654  * - which range to search when port is unspecified at bind() or connect()
 655  */
 656 #define IP_PORTRANGE_DEFAULT    0       /* default range */
 657 #define IP_PORTRANGE_HIGH       1       /* "high" - request firewall bypass */
 658 #define IP_PORTRANGE_LOW        2       /* "low" - vouchsafe security */
 659
 660
 661 /*
 662  * IP_PKTINFO: Packet information (equivalent to  RFC2292 sec 5 for IPv4)
 663  * This structure is used for
 664  *
 665  * 1) Receiving ancilliary data about the datagram if IP_PKTINFO sockopt is
 666  *    set on the socket. In this case ipi_ifindex will contain the interface
 667  *    index the datagram was received on, ipi_addr is the IP address the
 668  *    datagram was received to.
 669  *
 670  * 2) Sending a datagram using a specific interface or IP source address.
 671  *    if ipi_ifindex is set to non-zero when in_pktinfo is passed as
 672  *    ancilliary data of type IP_PKTINFO, this will be used as the source
 673  *    interface to send the datagram from. If ipi_ifindex is null, ip_spec_dst
 674  *    will be used for the source address.
 675  *
 676  *    Note: if IP_BOUND_IF is set on the socket, ipi_ifindex in the ancillary
 677  *    IP_PKTINFO option silently overrides the bound interface when it is
 678  *    specified during send time.
 679  */
 680 struct in_pktinfo {
 681         unsigned int    ipi_ifindex;    /* send/recv interface index */
 682         struct in_addr  ipi_spec_dst;   /* Local address */
 683         struct in_addr  ipi_addr;       /* IP Header dst address */
 684 };
 685
 686 /*
 687  * Definitions for inet sysctl operations.
 688  *
 689  * Third level is protocol number.
 690  * Fourth level is desired variable within that protocol.
 691  */
 692 #define IPPROTO_MAXID   (IPPROTO_AH + 1)        /* don't list to IPPROTO_MAX */
 693
 694 #ifdef BSD_KERNEL_PRIVATE
 695 #define CTL_IPPROTO_NAMES { \
 696         { "ip", CTLTYPE_NODE }, \
 697         { "icmp", CTLTYPE_NODE }, \
 698         { "igmp", CTLTYPE_NODE }, \
 699         { "ggp", CTLTYPE_NODE }, \
 700         { 0, 0 }, \
 701         { 0, 0 }, \
 702         { "tcp", CTLTYPE_NODE }, \
 703         { 0, 0 }, \
 704         { "egp", CTLTYPE_NODE }, \
 705         { 0, 0 }, \
 706         { 0, 0 }, \
 707         { 0, 0 }, \
 708         { "pup", CTLTYPE_NODE }, \
 709         { 0, 0 }, \
 710         { 0, 0 }, \
 711         { 0, 0 }, \
 712         { 0, 0 }, \
 713         { "udp", CTLTYPE_NODE }, \
 714         { 0, 0 }, \
 715         { 0, 0 }, \
 716         { 0, 0 }, \
 717         { 0, 0 }, \
 718         { "idp", CTLTYPE_NODE }, \
 719         { 0, 0 }, \
 720         { 0, 0 }, \
 721         { 0, 0 }, \
 722         { 0, 0 }, \
 723         { 0, 0 }, \
 724         { 0, 0 }, \
 725         { 0, 0 }, \
 726         { 0, 0 }, \
 727         { 0, 0 }, \
 728         { 0, 0 }, \
 729         { 0, 0 }, \
 730         { 0, 0 }, \
 731         { 0, 0 }, \
 732         { 0, 0 }, \
 733         { 0, 0 }, \
 734         { 0, 0 }, \
 735         { 0, 0 }, \
 736         { 0, 0 }, \
 737         { 0, 0 }, \
 738         { 0, 0 }, \
 739         { 0, 0 }, \
 740         { 0, 0 }, \
 741         { 0, 0 }, \
 742         { 0, 0 }, \
 743         { 0, 0 }, \
 744         { 0, 0 }, \
 745         { 0, 0 }, \
 746         { 0, 0 }, \
 747         { "ipsec", CTLTYPE_NODE }, \
 748 }
 749 #endif /* BSD_KERNEL_PRIVATE */
 750
 751 /*
 752  * Names for IP sysctl objects
 753  */
 754 #define IPCTL_FORWARDING        1       /* act as router */
 755 #define IPCTL_SENDREDIRECTS     2       /* may send redirects when forwarding */
 756 #define IPCTL_DEFTTL            3       /* default TTL */
 757 #ifdef notyet
 758 #define IPCTL_DEFMTU            4       /* default MTU */
 759 #endif
 760 #define IPCTL_RTEXPIRE          5       /* cloned route expiration time */
 761 #define IPCTL_RTMINEXPIRE       6       /* min value for expiration time */
 762 #define IPCTL_RTMAXCACHE        7       /* trigger level for dynamic expire */
 763 #define IPCTL_SOURCEROUTE       8       /* may perform source routes */
 764 #define IPCTL_DIRECTEDBROADCAST 9       /* may re-broadcast received packets */
 765 #define IPCTL_INTRQMAXLEN       10      /* max length of netisr queue */
 766 #define IPCTL_INTRQDROPS        11      /* number of netisr q drops */
 767 #define IPCTL_STATS             12      /* ipstat structure */
 768 #define IPCTL_ACCEPTSOURCEROUTE 13      /* may accept source routed packets */
 769 #define IPCTL_FASTFORWARDING    14      /* use fast IP forwarding code */
 770 #define IPCTL_KEEPFAITH         15      /* deprecated */
 771 #define IPCTL_GIF_TTL           16      /* default TTL for gif encap packet */
 772 #define IPCTL_MAXID             17
 773
 774 #ifdef BSD_KERNEL_PRIVATE
 775
 776 #define IPCTL_NAMES { \
 777         { 0, 0 }, \
 778         { "forwarding", CTLTYPE_INT }, \
 779         { "redirect", CTLTYPE_INT }, \
 780         { "ttl", CTLTYPE_INT }, \
 781         { "mtu", CTLTYPE_INT }, \
 782         { "rtexpire", CTLTYPE_INT }, \
 783         { "rtminexpire", CTLTYPE_INT }, \
 784         { "rtmaxcache", CTLTYPE_INT }, \
 785         { "sourceroute", CTLTYPE_INT }, \
 786         { "directed-broadcast", CTLTYPE_INT }, \
 787         { "intr-queue-maxlen", CTLTYPE_INT }, \
 788         { "intr-queue-drops", CTLTYPE_INT }, \
 789         { "stats", CTLTYPE_STRUCT }, \
 790         { "accept_sourceroute", CTLTYPE_INT }, \
 791         { "fastforwarding", CTLTYPE_INT }, \
 792         { "keepfaith", CTLTYPE_INT }, \
 793         { "gifttl", CTLTYPE_INT }, \
 794 }
 795 #endif /* BSD_KERNEL_PRIVATE */
 796 #endif  /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
 797
 798 /* INET6 stuff */
 799 #define __KAME_NETINET_IN_H_INCLUDED_
 800 #include <netinet6/in6.h>
 801 #undef __KAME_NETINET_IN_H_INCLUDED_
 802
 803 #ifdef PRIVATE
 804 /*
 805  * Minimal sized structure to hold an IPv4 or IPv6 socket address
 806  * as sockaddr_storage can waste memory
 807  */
 808 union sockaddr_in_4_6 {
 809         struct sockaddr         sa;
 810         struct sockaddr_in      sin;
 811         struct sockaddr_in6     sin6;
 812 };
 813
 814 /*
 815  * Recommended DiffServ Code Point values
 816  */
 817
 818 #define _DSCP_DF        0       /* RFC 2474 */
 819
 820 #define _DSCP_CS0       0       /* RFC 2474 */
 821 #define _DSCP_CS1       8       /* RFC 2474 */
 822 #define _DSCP_CS2       16      /* RFC 2474 */
 823 #define _DSCP_CS3       24      /* RFC 2474 */
 824 #define _DSCP_CS4       32      /* RFC 2474 */
 825 #define _DSCP_CS5       40      /* RFC 2474 */
 826 #define _DSCP_CS6       48      /* RFC 2474 */
 827 #define _DSCP_CS7       56      /* RFC 2474 */
 828
 829 #define _DSCP_EF        46      /* RFC 2474 */
 830 #define _DSCP_VA        44      /* RFC 5865 */
 831
 832 #define _DSCP_AF11      10      /* RFC 2597 */
 833 #define _DSCP_AF12      12      /* RFC 2597 */
 834 #define _DSCP_AF13      14      /* RFC 2597 */
 835 #define _DSCP_AF21      18      /* RFC 2597 */
 836 #define _DSCP_AF22      20      /* RFC 2597 */
 837 #define _DSCP_AF23      22      /* RFC 2597 */
 838 #define _DSCP_AF31      26      /* RFC 2597 */
 839 #define _DSCP_AF32      28      /* RFC 2597 */
 840 #define _DSCP_AF33      30      /* RFC 2597 */
 841 #define _DSCP_AF41      34      /* RFC 2597 */
 842 #define _DSCP_AF42      36      /* RFC 2597 */
 843 #define _DSCP_AF43      38      /* RFC 2597 */
 844
 845 #define _DSCP_52        52      /* Wi-Fi WMM Certification: Sigma */
 846
 847 #define _MAX_DSCP       63      /* coded on 6 bits */
 848
 849 #endif /* PRIVATE */
 850
 851 #ifdef KERNEL
 852 #ifdef BSD_KERNEL_PRIVATE
 853 #include <mach/boolean.h>
 854
 855 struct ip;
 856 struct ifnet;
 857 struct mbuf;
 858
 859 extern boolean_t in_broadcast(struct in_addr, struct ifnet *);
 860 extern boolean_t in_canforward(struct in_addr);
 861 extern u_int32_t in_netof(struct in_addr);
 862
 863 extern uint32_t os_cpu_in_cksum_mbuf(struct mbuf *m, int len, int off,
 864     uint32_t initial_sum);
 865
 866 extern uint16_t inet_cksum(struct mbuf *, uint32_t, uint32_t, uint32_t);
 867 extern uint16_t inet_cksum_buffer(const void *, uint32_t, uint32_t, uint32_t);
 868 extern uint16_t in_addword(uint16_t, uint16_t);
 869 extern uint16_t in_pseudo(uint32_t, uint32_t, uint32_t);
 870 extern uint16_t in_pseudo64(uint64_t, uint64_t, uint64_t);
 871 extern uint16_t in_cksum_hdr_opt(const struct ip *);
 872 extern uint16_t ip_cksum_hdr_dir(struct mbuf *, uint32_t, int);
 873 extern uint16_t ip_cksum_hdr_dir_buffer(const void *, uint32_t, uint32_t, int);
 874 extern uint32_t in_finalize_cksum(struct mbuf *, uint32_t, uint32_t);
 875 extern uint16_t b_sum16(const void *buf, int len);
 876 #if DEBUG || DEVELOPMENT
 877 extern uint32_t in_cksum_mbuf_ref(struct mbuf *, int, int, uint32_t);
 878 #endif /* DEBUG || DEVELOPMENT */
 879
 880 extern int in_getconninfo(struct socket *, sae_connid_t, uint32_t *,
 881     uint32_t *, int32_t *, user_addr_t, socklen_t *, user_addr_t, socklen_t *,
 882     uint32_t *, user_addr_t, uint32_t *);
 883
 884 #define in_cksum(_m, _l)                        \
 885         inet_cksum(_m, 0, 0, _l)
 886 #define in_cksum_buffer(_b, _l)                 \
 887         inet_cksum_buffer(_b, 0, 0, _l)
 888 #define ip_cksum_hdr_in(_m, _l)                 \
 889         ip_cksum_hdr_dir(_m, _l, 0)
 890 #define ip_cksum_hdr_out(_m, _l)                \
 891         ip_cksum_hdr_dir(_m, _l, 1)
 892
 893 #define in_cksum_hdr(_ip)                       \
 894         (~b_sum16(_ip, sizeof (struct ip)) & 0xffff)
 895
 896 #define in_cksum_offset(_m, _o)         \
 897         ((void) in_finalize_cksum(_m, _o, CSUM_DELAY_IP))
 898 #define in_delayed_cksum(_m)            \
 899         ((void) in_finalize_cksum(_m, 0, CSUM_DELAY_DATA))
 900 #define in_delayed_cksum_offset(_m, _o) \
 901         ((void) in_finalize_cksum(_m, _o, CSUM_DELAY_DATA))
 902
 903 #define in_hosteq(s, t) ((s).s_addr == (t).s_addr)
 904 #define in_nullhost(x)  ((x).s_addr == INADDR_ANY)
 905 #define in_allhosts(x)  ((x).s_addr == htonl(INADDR_ALLHOSTS_GROUP))
 906
 907 #define SIN(s)          ((struct sockaddr_in *)(void *)s)
 908 #define satosin(sa)     SIN(sa)
 909 #define sintosa(sin)    ((struct sockaddr *)(void *)(sin))
 910 #define SINIFSCOPE(s)   ((struct sockaddr_inifscope *)(void *)(s))
 911 #endif /* BSD_KERNEL_PRIVATE */
 912
 913 #ifdef KERNEL_PRIVATE
 914 /* exported for ApplicationFirewall */
 915 extern int in_localaddr(struct in_addr);
 916 extern int inaddr_local(struct in_addr);
 917
 918 extern char     *inet_ntoa(struct in_addr);
 919 extern char     *inet_ntoa_r(struct in_addr ina, char *buf,
 920     size_t buflen);
 921 extern int      inet_pton(int af, const char *, void *);
 922 #endif /* KERNEL_PRIVATE */
 923
 924 #define MAX_IPv4_STR_LEN        16
 925 #define MAX_IPv6_STR_LEN        64
 926
 927 extern int       inet_aton(const char *, struct in_addr *); /* in libkern */
 928 extern const char *inet_ntop(int, const void *, char *, socklen_t); /* in libkern*/
 929 #endif /* KERNEL */
 930
 931 #ifndef KERNEL
 932 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 933 __BEGIN_DECLS
 934 int        bindresvport(int, struct sockaddr_in *);
 935 struct sockaddr;
 936 int        bindresvport_sa(int, struct sockaddr *);
 937 __END_DECLS
 938 #endif
 939 #endif /* !KERNEL */
 940 #endif /* _NETINET_IN_H_ */