The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/in.h

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    1 /*-
    2  * Copyright (c) 1982, 1986, 1990, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)in.h        8.3 (Berkeley) 1/3/94
   30  * $FreeBSD: releng/9.1/sys/netinet/in.h 237910 2012-07-01 08:47:15Z tuexen $
   31  */
   32 
   33 #ifndef _NETINET_IN_H_
   34 #define _NETINET_IN_H_
   35 
   36 #include <sys/cdefs.h>
   37 #include <sys/_types.h>
   38 #include <machine/endian.h>
   39 
   40 /* Protocols common to RFC 1700, POSIX, and X/Open. */
   41 #define IPPROTO_IP              0               /* dummy for IP */
   42 #define IPPROTO_ICMP            1               /* control message protocol */
   43 #define IPPROTO_TCP             6               /* tcp */
   44 #define IPPROTO_UDP             17              /* user datagram protocol */
   45 
   46 #define INADDR_ANY              (u_int32_t)0x00000000
   47 #define INADDR_BROADCAST        (u_int32_t)0xffffffff   /* must be masked */
   48 
   49 #ifndef _UINT8_T_DECLARED
   50 typedef __uint8_t               uint8_t;
   51 #define _UINT8_T_DECLARED
   52 #endif
   53 
   54 #ifndef _UINT16_T_DECLARED
   55 typedef __uint16_t              uint16_t;
   56 #define _UINT16_T_DECLARED
   57 #endif
   58 
   59 #ifndef _UINT32_T_DECLARED
   60 typedef __uint32_t              uint32_t;
   61 #define _UINT32_T_DECLARED
   62 #endif
   63 
   64 #ifndef _IN_ADDR_T_DECLARED
   65 typedef uint32_t                in_addr_t;
   66 #define _IN_ADDR_T_DECLARED
   67 #endif
   68 
   69 #ifndef _IN_PORT_T_DECLARED
   70 typedef uint16_t                in_port_t;
   71 #define _IN_PORT_T_DECLARED
   72 #endif
   73 
   74 #ifndef _SA_FAMILY_T_DECLARED
   75 typedef __sa_family_t           sa_family_t;
   76 #define _SA_FAMILY_T_DECLARED
   77 #endif
   78 
   79 /* Internet address (a structure for historical reasons). */
   80 #ifndef _STRUCT_IN_ADDR_DECLARED
   81 struct in_addr {
   82         in_addr_t s_addr;
   83 };
   84 #define _STRUCT_IN_ADDR_DECLARED
   85 #endif
   86 
   87 #ifndef _SOCKLEN_T_DECLARED
   88 typedef __socklen_t     socklen_t;
   89 #define _SOCKLEN_T_DECLARED
   90 #endif
   91 
   92 #include <sys/_sockaddr_storage.h>
   93 
   94 /* Socket address, internet style. */
   95 struct sockaddr_in {
   96         uint8_t sin_len;
   97         sa_family_t     sin_family;
   98         in_port_t       sin_port;
   99         struct  in_addr sin_addr;
  100         char    sin_zero[8];
  101 };
  102 
  103 #if !defined(_KERNEL) && __BSD_VISIBLE
  104 
  105 #ifndef _BYTEORDER_PROTOTYPED
  106 #define _BYTEORDER_PROTOTYPED
  107 __BEGIN_DECLS
  108 uint32_t        htonl(uint32_t);
  109 uint16_t        htons(uint16_t);
  110 uint32_t        ntohl(uint32_t);
  111 uint16_t        ntohs(uint16_t);
  112 __END_DECLS
  113 #endif
  114 
  115 #ifndef _BYTEORDER_FUNC_DEFINED
  116 #define _BYTEORDER_FUNC_DEFINED
  117 #define htonl(x)        __htonl(x)
  118 #define htons(x)        __htons(x)
  119 #define ntohl(x)        __ntohl(x)
  120 #define ntohs(x)        __ntohs(x)
  121 #endif
  122 
  123 #endif /* !_KERNEL && __BSD_VISIBLE */
  124 
  125 #if __POSIX_VISIBLE >= 200112
  126 #define IPPROTO_RAW             255             /* raw IP packet */
  127 #define INET_ADDRSTRLEN         16
  128 #endif
  129 
  130 #if __BSD_VISIBLE
  131 /*
  132  * Constants and structures defined by the internet system,
  133  * Per RFC 790, September 1981, and numerous additions.
  134  */
  135 
  136 /*
  137  * Protocols (RFC 1700)
  138  */
  139 #define IPPROTO_HOPOPTS         0               /* IP6 hop-by-hop options */
  140 #define IPPROTO_IGMP            2               /* group mgmt protocol */
  141 #define IPPROTO_GGP             3               /* gateway^2 (deprecated) */
  142 #define IPPROTO_IPV4            4               /* IPv4 encapsulation */
  143 #define IPPROTO_IPIP            IPPROTO_IPV4    /* for compatibility */
  144 #define IPPROTO_ST              7               /* Stream protocol II */
  145 #define IPPROTO_EGP             8               /* exterior gateway protocol */
  146 #define IPPROTO_PIGP            9               /* private interior gateway */
  147 #define IPPROTO_RCCMON          10              /* BBN RCC Monitoring */
  148 #define IPPROTO_NVPII           11              /* network voice protocol*/
  149 #define IPPROTO_PUP             12              /* pup */
  150 #define IPPROTO_ARGUS           13              /* Argus */
  151 #define IPPROTO_EMCON           14              /* EMCON */
  152 #define IPPROTO_XNET            15              /* Cross Net Debugger */
  153 #define IPPROTO_CHAOS           16              /* Chaos*/
  154 #define IPPROTO_MUX             18              /* Multiplexing */
  155 #define IPPROTO_MEAS            19              /* DCN Measurement Subsystems */
  156 #define IPPROTO_HMP             20              /* Host Monitoring */
  157 #define IPPROTO_PRM             21              /* Packet Radio Measurement */
  158 #define IPPROTO_IDP             22              /* xns idp */
  159 #define IPPROTO_TRUNK1          23              /* Trunk-1 */
  160 #define IPPROTO_TRUNK2          24              /* Trunk-2 */
  161 #define IPPROTO_LEAF1           25              /* Leaf-1 */
  162 #define IPPROTO_LEAF2           26              /* Leaf-2 */
  163 #define IPPROTO_RDP             27              /* Reliable Data */
  164 #define IPPROTO_IRTP            28              /* Reliable Transaction */
  165 #define IPPROTO_TP              29              /* tp-4 w/ class negotiation */
  166 #define IPPROTO_BLT             30              /* Bulk Data Transfer */
  167 #define IPPROTO_NSP             31              /* Network Services */
  168 #define IPPROTO_INP             32              /* Merit Internodal */
  169 #define IPPROTO_SEP             33              /* Sequential Exchange */
  170 #define IPPROTO_3PC             34              /* Third Party Connect */
  171 #define IPPROTO_IDPR            35              /* InterDomain Policy Routing */
  172 #define IPPROTO_XTP             36              /* XTP */
  173 #define IPPROTO_DDP             37              /* Datagram Delivery */
  174 #define IPPROTO_CMTP            38              /* Control Message Transport */
  175 #define IPPROTO_TPXX            39              /* TP++ Transport */
  176 #define IPPROTO_IL              40              /* IL transport protocol */
  177 #define IPPROTO_IPV6            41              /* IP6 header */
  178 #define IPPROTO_SDRP            42              /* Source Demand Routing */
  179 #define IPPROTO_ROUTING         43              /* IP6 routing header */
  180 #define IPPROTO_FRAGMENT        44              /* IP6 fragmentation header */
  181 #define IPPROTO_IDRP            45              /* InterDomain Routing*/
  182 #define IPPROTO_RSVP            46              /* resource reservation */
  183 #define IPPROTO_GRE             47              /* General Routing Encap. */
  184 #define IPPROTO_MHRP            48              /* Mobile Host Routing */
  185 #define IPPROTO_BHA             49              /* BHA */
  186 #define IPPROTO_ESP             50              /* IP6 Encap Sec. Payload */
  187 #define IPPROTO_AH              51              /* IP6 Auth Header */
  188 #define IPPROTO_INLSP           52              /* Integ. Net Layer Security */
  189 #define IPPROTO_SWIPE           53              /* IP with encryption */
  190 #define IPPROTO_NHRP            54              /* Next Hop Resolution */
  191 #define IPPROTO_MOBILE          55              /* IP Mobility */
  192 #define IPPROTO_TLSP            56              /* Transport Layer Security */
  193 #define IPPROTO_SKIP            57              /* SKIP */
  194 #define IPPROTO_ICMPV6          58              /* ICMP6 */
  195 #define IPPROTO_NONE            59              /* IP6 no next header */
  196 #define IPPROTO_DSTOPTS         60              /* IP6 destination option */
  197 #define IPPROTO_AHIP            61              /* any host internal protocol */
  198 #define IPPROTO_CFTP            62              /* CFTP */
  199 #define IPPROTO_HELLO           63              /* "hello" routing protocol */
  200 #define IPPROTO_SATEXPAK        64              /* SATNET/Backroom EXPAK */
  201 #define IPPROTO_KRYPTOLAN       65              /* Kryptolan */
  202 #define IPPROTO_RVD             66              /* Remote Virtual Disk */
  203 #define IPPROTO_IPPC            67              /* Pluribus Packet Core */
  204 #define IPPROTO_ADFS            68              /* Any distributed FS */
  205 #define IPPROTO_SATMON          69              /* Satnet Monitoring */
  206 #define IPPROTO_VISA            70              /* VISA Protocol */
  207 #define IPPROTO_IPCV            71              /* Packet Core Utility */
  208 #define IPPROTO_CPNX            72              /* Comp. Prot. Net. Executive */
  209 #define IPPROTO_CPHB            73              /* Comp. Prot. HeartBeat */
  210 #define IPPROTO_WSN             74              /* Wang Span Network */
  211 #define IPPROTO_PVP             75              /* Packet Video Protocol */
  212 #define IPPROTO_BRSATMON        76              /* BackRoom SATNET Monitoring */
  213 #define IPPROTO_ND              77              /* Sun net disk proto (temp.) */
  214 #define IPPROTO_WBMON           78              /* WIDEBAND Monitoring */
  215 #define IPPROTO_WBEXPAK         79              /* WIDEBAND EXPAK */
  216 #define IPPROTO_EON             80              /* ISO cnlp */
  217 #define IPPROTO_VMTP            81              /* VMTP */
  218 #define IPPROTO_SVMTP           82              /* Secure VMTP */
  219 #define IPPROTO_VINES           83              /* Banyon VINES */
  220 #define IPPROTO_TTP             84              /* TTP */
  221 #define IPPROTO_IGP             85              /* NSFNET-IGP */
  222 #define IPPROTO_DGP             86              /* dissimilar gateway prot. */
  223 #define IPPROTO_TCF             87              /* TCF */
  224 #define IPPROTO_IGRP            88              /* Cisco/GXS IGRP */
  225 #define IPPROTO_OSPFIGP         89              /* OSPFIGP */
  226 #define IPPROTO_SRPC            90              /* Strite RPC protocol */
  227 #define IPPROTO_LARP            91              /* Locus Address Resoloution */
  228 #define IPPROTO_MTP             92              /* Multicast Transport */
  229 #define IPPROTO_AX25            93              /* AX.25 Frames */
  230 #define IPPROTO_IPEIP           94              /* IP encapsulated in IP */
  231 #define IPPROTO_MICP            95              /* Mobile Int.ing control */
  232 #define IPPROTO_SCCSP           96              /* Semaphore Comm. security */
  233 #define IPPROTO_ETHERIP         97              /* Ethernet IP encapsulation */
  234 #define IPPROTO_ENCAP           98              /* encapsulation header */
  235 #define IPPROTO_APES            99              /* any private encr. scheme */
  236 #define IPPROTO_GMTP            100             /* GMTP*/
  237 #define IPPROTO_IPCOMP          108             /* payload compression (IPComp) */
  238 #define IPPROTO_SCTP            132             /* SCTP */
  239 #define IPPROTO_MH              135             /* IPv6 Mobility Header */
  240 /* 101-254: Partly Unassigned */
  241 #define IPPROTO_PIM             103             /* Protocol Independent Mcast */
  242 #define IPPROTO_CARP            112             /* CARP */
  243 #define IPPROTO_PGM             113             /* PGM */
  244 #define IPPROTO_PFSYNC          240             /* PFSYNC */
  245 /* 255: Reserved */
  246 /* BSD Private, local use, namespace incursion, no longer used */
  247 #define IPPROTO_OLD_DIVERT      254             /* OLD divert pseudo-proto */
  248 #define IPPROTO_MAX             256
  249 
  250 /* last return value of *_input(), meaning "all job for this pkt is done".  */
  251 #define IPPROTO_DONE            257
  252 
  253 /* Only used internally, so can be outside the range of valid IP protocols. */
  254 #define IPPROTO_DIVERT          258             /* divert pseudo-protocol */
  255 #define IPPROTO_SEND            259             /* SeND pseudo-protocol */
  256 
  257 /*
  258  * Defined to avoid confusion.  The master value is defined by
  259  * PROTO_SPACER in sys/protosw.h.
  260  */
  261 #define IPPROTO_SPACER          32767           /* spacer for loadable protos */
  262 
  263 /*
  264  * Local port number conventions:
  265  *
  266  * When a user does a bind(2) or connect(2) with a port number of zero,
  267  * a non-conflicting local port address is chosen.
  268  * The default range is IPPORT_HIFIRSTAUTO through
  269  * IPPORT_HILASTAUTO, although that is settable by sysctl.
  270  *
  271  * A user may set the IPPROTO_IP option IP_PORTRANGE to change this
  272  * default assignment range.
  273  *
  274  * The value IP_PORTRANGE_DEFAULT causes the default behavior.
  275  *
  276  * The value IP_PORTRANGE_HIGH changes the range of candidate port numbers
  277  * into the "high" range.  These are reserved for client outbound connections
  278  * which do not want to be filtered by any firewalls.
  279  *
  280  * The value IP_PORTRANGE_LOW changes the range to the "low" are
  281  * that is (by convention) restricted to privileged processes.  This
  282  * convention is based on "vouchsafe" principles only.  It is only secure
  283  * if you trust the remote host to restrict these ports.
  284  *
  285  * The default range of ports and the high range can be changed by
  286  * sysctl(3).  (net.inet.ip.port{hi,low}{first,last}_auto)
  287  *
  288  * Changing those values has bad security implications if you are
  289  * using a stateless firewall that is allowing packets outside of that
  290  * range in order to allow transparent outgoing connections.
  291  *
  292  * Such a firewall configuration will generally depend on the use of these
  293  * default values.  If you change them, you may find your Security
  294  * Administrator looking for you with a heavy object.
  295  *
  296  * For a slightly more orthodox text view on this:
  297  *
  298  *            ftp://ftp.isi.edu/in-notes/iana/assignments/port-numbers
  299  *
  300  *    port numbers are divided into three ranges:
  301  *
  302  *                0 -  1023 Well Known Ports
  303  *             1024 - 49151 Registered Ports
  304  *            49152 - 65535 Dynamic and/or Private Ports
  305  *
  306  */
  307 
  308 /*
  309  * Ports < IPPORT_RESERVED are reserved for
  310  * privileged processes (e.g. root).         (IP_PORTRANGE_LOW)
  311  */
  312 #define IPPORT_RESERVED         1024
  313 
  314 /*
  315  * Default local port range, used by IP_PORTRANGE_DEFAULT
  316  */
  317 #define IPPORT_EPHEMERALFIRST   10000
  318 #define IPPORT_EPHEMERALLAST    65535 
  319  
  320 /*
  321  * Dynamic port range, used by IP_PORTRANGE_HIGH.
  322  */
  323 #define IPPORT_HIFIRSTAUTO      49152
  324 #define IPPORT_HILASTAUTO       65535
  325 
  326 /*
  327  * Scanning for a free reserved port return a value below IPPORT_RESERVED,
  328  * but higher than IPPORT_RESERVEDSTART.  Traditionally the start value was
  329  * 512, but that conflicts with some well-known-services that firewalls may
  330  * have a fit if we use.
  331  */
  332 #define IPPORT_RESERVEDSTART    600
  333 
  334 #define IPPORT_MAX              65535
  335 
  336 /*
  337  * Definitions of bits in internet address integers.
  338  * On subnets, the decomposition of addresses to host and net parts
  339  * is done according to subnet mask, not the masks here.
  340  */
  341 #define IN_CLASSA(i)            (((u_int32_t)(i) & 0x80000000) == 0)
  342 #define IN_CLASSA_NET           0xff000000
  343 #define IN_CLASSA_NSHIFT        24
  344 #define IN_CLASSA_HOST          0x00ffffff
  345 #define IN_CLASSA_MAX           128
  346 
  347 #define IN_CLASSB(i)            (((u_int32_t)(i) & 0xc0000000) == 0x80000000)
  348 #define IN_CLASSB_NET           0xffff0000
  349 #define IN_CLASSB_NSHIFT        16
  350 #define IN_CLASSB_HOST          0x0000ffff
  351 #define IN_CLASSB_MAX           65536
  352 
  353 #define IN_CLASSC(i)            (((u_int32_t)(i) & 0xe0000000) == 0xc0000000)
  354 #define IN_CLASSC_NET           0xffffff00
  355 #define IN_CLASSC_NSHIFT        8
  356 #define IN_CLASSC_HOST          0x000000ff
  357 
  358 #define IN_CLASSD(i)            (((u_int32_t)(i) & 0xf0000000) == 0xe0000000)
  359 #define IN_CLASSD_NET           0xf0000000      /* These ones aren't really */
  360 #define IN_CLASSD_NSHIFT        28              /* net and host fields, but */
  361 #define IN_CLASSD_HOST          0x0fffffff      /* routing needn't know.    */
  362 #define IN_MULTICAST(i)         IN_CLASSD(i)
  363 
  364 #define IN_EXPERIMENTAL(i)      (((u_int32_t)(i) & 0xf0000000) == 0xf0000000)
  365 #define IN_BADCLASS(i)          (((u_int32_t)(i) & 0xf0000000) == 0xf0000000)
  366 
  367 #define IN_LINKLOCAL(i)         (((u_int32_t)(i) & 0xffff0000) == 0xa9fe0000)
  368 #define IN_LOOPBACK(i)          (((u_int32_t)(i) & 0xff000000) == 0x7f000000)
  369 #define IN_ZERONET(i)           (((u_int32_t)(i) & 0xff000000) == 0)
  370 
  371 #define IN_PRIVATE(i)   ((((u_int32_t)(i) & 0xff000000) == 0x0a000000) || \
  372                          (((u_int32_t)(i) & 0xfff00000) == 0xac100000) || \
  373                          (((u_int32_t)(i) & 0xffff0000) == 0xc0a80000))
  374 
  375 #define IN_LOCAL_GROUP(i)       (((u_int32_t)(i) & 0xffffff00) == 0xe0000000)
  376  
  377 #define IN_ANY_LOCAL(i)         (IN_LINKLOCAL(i) || IN_LOCAL_GROUP(i))
  378 
  379 #define INADDR_LOOPBACK         (u_int32_t)0x7f000001
  380 #ifndef _KERNEL
  381 #define INADDR_NONE             0xffffffff              /* -1 return */
  382 #endif
  383 
  384 #define INADDR_UNSPEC_GROUP     (u_int32_t)0xe0000000   /* 224.0.0.0 */
  385 #define INADDR_ALLHOSTS_GROUP   (u_int32_t)0xe0000001   /* 224.0.0.1 */
  386 #define INADDR_ALLRTRS_GROUP    (u_int32_t)0xe0000002   /* 224.0.0.2 */
  387 #define INADDR_ALLRPTS_GROUP    (u_int32_t)0xe0000016   /* 224.0.0.22, IGMPv3 */
  388 #define INADDR_CARP_GROUP       (u_int32_t)0xe0000012   /* 224.0.0.18 */
  389 #define INADDR_PFSYNC_GROUP     (u_int32_t)0xe00000f0   /* 224.0.0.240 */
  390 #define INADDR_ALLMDNS_GROUP    (u_int32_t)0xe00000fb   /* 224.0.0.251 */
  391 #define INADDR_MAX_LOCAL_GROUP  (u_int32_t)0xe00000ff   /* 224.0.0.255 */
  392 
  393 #define IN_LOOPBACKNET          127                     /* official! */
  394 
  395 #define IN_RFC3021_MASK         (u_int32_t)0xfffffffe
  396 
  397 /*
  398  * Options for use with [gs]etsockopt at the IP level.
  399  * First word of comment is data type; bool is stored in int.
  400  */
  401 #define IP_OPTIONS              1    /* buf/ip_opts; set/get IP options */
  402 #define IP_HDRINCL              2    /* int; header is included with data */
  403 #define IP_TOS                  3    /* int; IP type of service and preced. */
  404 #define IP_TTL                  4    /* int; IP time to live */
  405 #define IP_RECVOPTS             5    /* bool; receive all IP opts w/dgram */
  406 #define IP_RECVRETOPTS          6    /* bool; receive IP opts for response */
  407 #define IP_RECVDSTADDR          7    /* bool; receive IP dst addr w/dgram */
  408 #define IP_SENDSRCADDR          IP_RECVDSTADDR /* cmsg_type to set src addr */
  409 #define IP_RETOPTS              8    /* ip_opts; set/get IP options */
  410 #define IP_MULTICAST_IF         9    /* struct in_addr *or* struct ip_mreqn;
  411                                       * set/get IP multicast i/f  */
  412 #define IP_MULTICAST_TTL        10   /* u_char; set/get IP multicast ttl */
  413 #define IP_MULTICAST_LOOP       11   /* u_char; set/get IP multicast loopback */
  414 #define IP_ADD_MEMBERSHIP       12   /* ip_mreq; add an IP group membership */
  415 #define IP_DROP_MEMBERSHIP      13   /* ip_mreq; drop an IP group membership */
  416 #define IP_MULTICAST_VIF        14   /* set/get IP mcast virt. iface */
  417 #define IP_RSVP_ON              15   /* enable RSVP in kernel */
  418 #define IP_RSVP_OFF             16   /* disable RSVP in kernel */
  419 #define IP_RSVP_VIF_ON          17   /* set RSVP per-vif socket */
  420 #define IP_RSVP_VIF_OFF         18   /* unset RSVP per-vif socket */
  421 #define IP_PORTRANGE            19   /* int; range to choose for unspec port */
  422 #define IP_RECVIF               20   /* bool; receive reception if w/dgram */
  423 /* for IPSEC */
  424 #define IP_IPSEC_POLICY         21   /* int; set/get security policy */
  425 #define IP_FAITH                22   /* bool; accept FAITH'ed connections */
  426 
  427 #define IP_ONESBCAST            23   /* bool: send all-ones broadcast */
  428 #define IP_BINDANY              24   /* bool: allow bind to any address */
  429 
  430 /*
  431  * Options for controlling the firewall and dummynet.
  432  * Historical options (from 40 to 64) will eventually be
  433  * replaced by only two options, IP_FW3 and IP_DUMMYNET3.
  434  */
  435 #define IP_FW_TABLE_ADD         40   /* add entry */
  436 #define IP_FW_TABLE_DEL         41   /* delete entry */
  437 #define IP_FW_TABLE_FLUSH       42   /* flush table */
  438 #define IP_FW_TABLE_GETSIZE     43   /* get table size */
  439 #define IP_FW_TABLE_LIST        44   /* list table contents */
  440 
  441 #define IP_FW3                  48   /* generic ipfw v.3 sockopts */
  442 #define IP_DUMMYNET3            49   /* generic dummynet v.3 sockopts */
  443 
  444 #define IP_FW_ADD               50   /* add a firewall rule to chain */
  445 #define IP_FW_DEL               51   /* delete a firewall rule from chain */
  446 #define IP_FW_FLUSH             52   /* flush firewall rule chain */
  447 #define IP_FW_ZERO              53   /* clear single/all firewall counter(s) */
  448 #define IP_FW_GET               54   /* get entire firewall rule chain */
  449 #define IP_FW_RESETLOG          55   /* reset logging counters */
  450 
  451 #define IP_FW_NAT_CFG           56   /* add/config a nat rule */
  452 #define IP_FW_NAT_DEL           57   /* delete a nat rule */
  453 #define IP_FW_NAT_GET_CONFIG    58   /* get configuration of a nat rule */
  454 #define IP_FW_NAT_GET_LOG       59   /* get log of a nat rule */
  455 
  456 #define IP_DUMMYNET_CONFIGURE   60   /* add/configure a dummynet pipe */
  457 #define IP_DUMMYNET_DEL         61   /* delete a dummynet pipe from chain */
  458 #define IP_DUMMYNET_FLUSH       62   /* flush dummynet */
  459 #define IP_DUMMYNET_GET         64   /* get entire dummynet pipes */
  460 
  461 #define IP_RECVTTL              65   /* bool; receive IP TTL w/dgram */
  462 #define IP_MINTTL               66   /* minimum TTL for packet or drop */
  463 #define IP_DONTFRAG             67   /* don't fragment packet */
  464 #define IP_RECVTOS              68   /* bool; receive IP TOS w/dgram */
  465 
  466 /* IPv4 Source Filter Multicast API [RFC3678] */
  467 #define IP_ADD_SOURCE_MEMBERSHIP        70   /* join a source-specific group */
  468 #define IP_DROP_SOURCE_MEMBERSHIP       71   /* drop a single source */
  469 #define IP_BLOCK_SOURCE                 72   /* block a source */
  470 #define IP_UNBLOCK_SOURCE               73   /* unblock a source */
  471 
  472 /* The following option is private; do not use it from user applications. */
  473 #define IP_MSFILTER                     74   /* set/get filter list */
  474 
  475 /* Protocol Independent Multicast API [RFC3678] */
  476 #define MCAST_JOIN_GROUP                80   /* join an any-source group */
  477 #define MCAST_LEAVE_GROUP               81   /* leave all sources for group */
  478 #define MCAST_JOIN_SOURCE_GROUP         82   /* join a source-specific group */
  479 #define MCAST_LEAVE_SOURCE_GROUP        83   /* leave a single source */
  480 #define MCAST_BLOCK_SOURCE              84   /* block a source */
  481 #define MCAST_UNBLOCK_SOURCE            85   /* unblock a source */
  482 
  483 /*
  484  * Defaults and limits for options
  485  */
  486 #define IP_DEFAULT_MULTICAST_TTL  1     /* normally limit m'casts to 1 hop  */
  487 #define IP_DEFAULT_MULTICAST_LOOP 1     /* normally hear sends if a member  */
  488 
  489 /*
  490  * The imo_membership vector for each socket is now dynamically allocated at
  491  * run-time, bounded by USHRT_MAX, and is reallocated when needed, sized
  492  * according to a power-of-two increment.
  493  */
  494 #define IP_MIN_MEMBERSHIPS      31
  495 #define IP_MAX_MEMBERSHIPS      4095
  496 #define IP_MAX_SOURCE_FILTER    1024    /* XXX to be unused */
  497 
  498 /*
  499  * Default resource limits for IPv4 multicast source filtering.
  500  * These may be modified by sysctl.
  501  */
  502 #define IP_MAX_GROUP_SRC_FILTER         512     /* sources per group */
  503 #define IP_MAX_SOCK_SRC_FILTER          128     /* sources per socket/group */
  504 #define IP_MAX_SOCK_MUTE_FILTER         128     /* XXX no longer used */
  505 
  506 /*
  507  * Argument structure for IP_ADD_MEMBERSHIP and IP_DROP_MEMBERSHIP.
  508  */
  509 struct ip_mreq {
  510         struct  in_addr imr_multiaddr;  /* IP multicast address of group */
  511         struct  in_addr imr_interface;  /* local IP address of interface */
  512 };
  513 
  514 /*
  515  * Modified argument structure for IP_MULTICAST_IF, obtained from Linux.
  516  * This is used to specify an interface index for multicast sends, as
  517  * the IPv4 legacy APIs do not support this (unless IP_SENDIF is available).
  518  */
  519 struct ip_mreqn {
  520         struct  in_addr imr_multiaddr;  /* IP multicast address of group */
  521         struct  in_addr imr_address;    /* local IP address of interface */
  522         int             imr_ifindex;    /* Interface index; cast to uint32_t */
  523 };
  524 
  525 /*
  526  * Argument structure for IPv4 Multicast Source Filter APIs. [RFC3678]
  527  */
  528 struct ip_mreq_source {
  529         struct  in_addr imr_multiaddr;  /* IP multicast address of group */
  530         struct  in_addr imr_sourceaddr; /* IP address of source */
  531         struct  in_addr imr_interface;  /* local IP address of interface */
  532 };
  533 
  534 /*
  535  * Argument structures for Protocol-Independent Multicast Source
  536  * Filter APIs. [RFC3678]
  537  */
  538 struct group_req {
  539         uint32_t                gr_interface;   /* interface index */
  540         struct sockaddr_storage gr_group;       /* group address */
  541 };
  542 
  543 struct group_source_req {
  544         uint32_t                gsr_interface;  /* interface index */
  545         struct sockaddr_storage gsr_group;      /* group address */
  546         struct sockaddr_storage gsr_source;     /* source address */
  547 };
  548 
  549 #ifndef __MSFILTERREQ_DEFINED
  550 #define __MSFILTERREQ_DEFINED
  551 /*
  552  * The following structure is private; do not use it from user applications.
  553  * It is used to communicate IP_MSFILTER/IPV6_MSFILTER information between
  554  * the RFC 3678 libc functions and the kernel.
  555  */
  556 struct __msfilterreq {
  557         uint32_t                 msfr_ifindex;  /* interface index */
  558         uint32_t                 msfr_fmode;    /* filter mode for group */
  559         uint32_t                 msfr_nsrcs;    /* # of sources in msfr_srcs */
  560         struct sockaddr_storage  msfr_group;    /* group address */
  561         struct sockaddr_storage *msfr_srcs;     /* pointer to the first member
  562                                                  * of a contiguous array of
  563                                                  * sources to filter in full.
  564                                                  */
  565 };
  566 #endif
  567 
  568 struct sockaddr;
  569 
  570 /*
  571  * Advanced (Full-state) APIs [RFC3678]
  572  * The RFC specifies uint_t for the 6th argument to [sg]etsourcefilter().
  573  * We use uint32_t here to be consistent.
  574  */
  575 int     setipv4sourcefilter(int, struct in_addr, struct in_addr, uint32_t,
  576             uint32_t, struct in_addr *);
  577 int     getipv4sourcefilter(int, struct in_addr, struct in_addr, uint32_t *,
  578             uint32_t *, struct in_addr *);
  579 int     setsourcefilter(int, uint32_t, struct sockaddr *, socklen_t,
  580             uint32_t, uint32_t, struct sockaddr_storage *);
  581 int     getsourcefilter(int, uint32_t, struct sockaddr *, socklen_t,
  582             uint32_t *, uint32_t *, struct sockaddr_storage *);
  583 
  584 /*
  585  * Filter modes; also used to represent per-socket filter mode internally.
  586  */
  587 #define MCAST_UNDEFINED 0       /* fmode: not yet defined */
  588 #define MCAST_INCLUDE   1       /* fmode: include these source(s) */
  589 #define MCAST_EXCLUDE   2       /* fmode: exclude these source(s) */
  590 
  591 /*
  592  * Argument for IP_PORTRANGE:
  593  * - which range to search when port is unspecified at bind() or connect()
  594  */
  595 #define IP_PORTRANGE_DEFAULT    0       /* default range */
  596 #define IP_PORTRANGE_HIGH       1       /* "high" - request firewall bypass */
  597 #define IP_PORTRANGE_LOW        2       /* "low" - vouchsafe security */
  598 
  599 /*
  600  * Definitions for inet sysctl operations.
  601  *
  602  * Third level is protocol number.
  603  * Fourth level is desired variable within that protocol.
  604  */
  605 #define IPPROTO_MAXID   (IPPROTO_AH + 1)        /* don't list to IPPROTO_MAX */
  606 
  607 #define CTL_IPPROTO_NAMES { \
  608         { "ip", CTLTYPE_NODE }, \
  609         { "icmp", CTLTYPE_NODE }, \
  610         { "igmp", CTLTYPE_NODE }, \
  611         { "ggp", CTLTYPE_NODE }, \
  612         { 0, 0 }, \
  613         { 0, 0 }, \
  614         { "tcp", CTLTYPE_NODE }, \
  615         { 0, 0 }, \
  616         { "egp", CTLTYPE_NODE }, \
  617         { 0, 0 }, \
  618         { 0, 0 }, \
  619         { 0, 0 }, \
  620         { "pup", CTLTYPE_NODE }, \
  621         { 0, 0 }, \
  622         { 0, 0 }, \
  623         { 0, 0 }, \
  624         { 0, 0 }, \
  625         { "udp", CTLTYPE_NODE }, \
  626         { 0, 0 }, \
  627         { 0, 0 }, \
  628         { 0, 0 }, \
  629         { 0, 0 }, \
  630         { "idp", CTLTYPE_NODE }, \
  631         { 0, 0 }, \
  632         { 0, 0 }, \
  633         { 0, 0 }, \
  634         { 0, 0 }, \
  635         { 0, 0 }, \
  636         { 0, 0 }, \
  637         { 0, 0 }, \
  638         { 0, 0 }, \
  639         { 0, 0 }, \
  640         { 0, 0 }, \
  641         { 0, 0 }, \
  642         { 0, 0 }, \
  643         { 0, 0 }, \
  644         { 0, 0 }, \
  645         { 0, 0 }, \
  646         { 0, 0 }, \
  647         { 0, 0 }, \
  648         { 0, 0 }, \
  649         { 0, 0 }, \
  650         { 0, 0 }, \
  651         { 0, 0 }, \
  652         { 0, 0 }, \
  653         { 0, 0 }, \
  654         { 0, 0 }, \
  655         { 0, 0 }, \
  656         { 0, 0 }, \
  657         { 0, 0 }, \
  658         { 0, 0 }, \
  659         { "ipsec", CTLTYPE_NODE }, \
  660         { 0, 0 }, \
  661         { 0, 0 }, \
  662         { 0, 0 }, \
  663         { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
  664         { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
  665         { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
  666         { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
  667         { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
  668         { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
  669         { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
  670         { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
  671         { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
  672         { 0, 0 }, \
  673         { 0, 0 }, \
  674         { 0, 0 }, \
  675         { "pim", CTLTYPE_NODE }, \
  676 }
  677 
  678 /*
  679  * Names for IP sysctl objects
  680  */
  681 #define IPCTL_FORWARDING        1       /* act as router */
  682 #define IPCTL_SENDREDIRECTS     2       /* may send redirects when forwarding */
  683 #define IPCTL_DEFTTL            3       /* default TTL */
  684 #ifdef notyet
  685 #define IPCTL_DEFMTU            4       /* default MTU */
  686 #endif
  687 #define IPCTL_RTEXPIRE          5       /* cloned route expiration time */
  688 #define IPCTL_RTMINEXPIRE       6       /* min value for expiration time */
  689 #define IPCTL_RTMAXCACHE        7       /* trigger level for dynamic expire */
  690 #define IPCTL_SOURCEROUTE       8       /* may perform source routes */
  691 #define IPCTL_DIRECTEDBROADCAST 9       /* may re-broadcast received packets */
  692 #define IPCTL_INTRQMAXLEN       10      /* max length of netisr queue */
  693 #define IPCTL_INTRQDROPS        11      /* number of netisr q drops */
  694 #define IPCTL_STATS             12      /* ipstat structure */
  695 #define IPCTL_ACCEPTSOURCEROUTE 13      /* may accept source routed packets */
  696 #define IPCTL_FASTFORWARDING    14      /* use fast IP forwarding code */
  697 #define IPCTL_KEEPFAITH         15      /* FAITH IPv4->IPv6 translater ctl */
  698 #define IPCTL_GIF_TTL           16      /* default TTL for gif encap packet */
  699 #define IPCTL_MAXID             17
  700 
  701 #define IPCTL_NAMES { \
  702         { 0, 0 }, \
  703         { "forwarding", CTLTYPE_INT }, \
  704         { "redirect", CTLTYPE_INT }, \
  705         { "ttl", CTLTYPE_INT }, \
  706         { "mtu", CTLTYPE_INT }, \
  707         { "rtexpire", CTLTYPE_INT }, \
  708         { "rtminexpire", CTLTYPE_INT }, \
  709         { "rtmaxcache", CTLTYPE_INT }, \
  710         { "sourceroute", CTLTYPE_INT }, \
  711         { "directed-broadcast", CTLTYPE_INT }, \
  712         { "intr-queue-maxlen", CTLTYPE_INT }, \
  713         { "intr-queue-drops", CTLTYPE_INT }, \
  714         { "stats", CTLTYPE_STRUCT }, \
  715         { "accept_sourceroute", CTLTYPE_INT }, \
  716         { "fastforwarding", CTLTYPE_INT }, \
  717 }
  718 
  719 #endif /* __BSD_VISIBLE */
  720 
  721 #ifdef _KERNEL
  722 
  723 struct ifnet; struct mbuf;      /* forward declarations for Standard C */
  724 
  725 int      in_broadcast(struct in_addr, struct ifnet *);
  726 int      in_canforward(struct in_addr);
  727 int      in_localaddr(struct in_addr);
  728 int      in_localip(struct in_addr);
  729 int      inet_aton(const char *, struct in_addr *); /* in libkern */
  730 char    *inet_ntoa(struct in_addr); /* in libkern */
  731 char    *inet_ntoa_r(struct in_addr ina, char *buf); /* in libkern */
  732 char    *inet_ntop(int, const void *, char *, socklen_t); /* in libkern */
  733 int      inet_pton(int af, const char *, void *); /* in libkern */
  734 void     in_ifdetach(struct ifnet *);
  735 
  736 #define in_hosteq(s, t) ((s).s_addr == (t).s_addr)
  737 #define in_nullhost(x)  ((x).s_addr == INADDR_ANY)
  738 #define in_allhosts(x)  ((x).s_addr == htonl(INADDR_ALLHOSTS_GROUP))
  739 
  740 #define satosin(sa)     ((struct sockaddr_in *)(sa))
  741 #define sintosa(sin)    ((struct sockaddr *)(sin))
  742 #define ifatoia(ifa)    ((struct in_ifaddr *)(ifa))
  743 
  744 /*
  745  * Historically, BSD keeps ip_len and ip_off in host format
  746  * when doing layer 3 processing, and this often requires
  747  * to translate the format back and forth.
  748  * To make the process explicit, we define a couple of macros
  749  * that also take into account the fact that at some point
  750  * we may want to keep those fields always in net format.
  751  */
  752 
  753 #if (BYTE_ORDER == BIG_ENDIAN) || defined(HAVE_NET_IPLEN)
  754 #define SET_NET_IPLEN(p)        do {} while (0)
  755 #define SET_HOST_IPLEN(p)       do {} while (0)
  756 #else
  757 #define SET_NET_IPLEN(p)        do {            \
  758         struct ip *h_ip = (p);                  \
  759         h_ip->ip_len = htons(h_ip->ip_len);     \
  760         h_ip->ip_off = htons(h_ip->ip_off);     \
  761         } while (0)
  762 
  763 #define SET_HOST_IPLEN(p)       do {            \
  764         struct ip *h_ip = (p);                  \
  765         h_ip->ip_len = ntohs(h_ip->ip_len);     \
  766         h_ip->ip_off = ntohs(h_ip->ip_off);     \
  767         } while (0)
  768 #endif /* !HAVE_NET_IPLEN */
  769 
  770 #endif /* _KERNEL */
  771 
  772 /* INET6 stuff */
  773 #if __POSIX_VISIBLE >= 200112
  774 #define __KAME_NETINET_IN_H_INCLUDED_
  775 #include <netinet6/in6.h>
  776 #undef __KAME_NETINET_IN_H_INCLUDED_
  777 #endif
  778 
  779 #endif /* !_NETINET_IN_H_*/

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