The Design and Implementation of the FreeBSD Operating System, Second Edition
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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/7.4/sys/netinet/in.h 200123 2009-12-05 13:53:41Z luigi $
   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 /* Avoid collision with original definition in sys/socket.h. */
   93 #ifndef _STRUCT_SOCKADDR_STORAGE_DECLARED
   94 /*
   95  * RFC 2553: protocol-independent placeholder for socket addresses
   96  */
   97 #define _SS_MAXSIZE     128U
   98 #define _SS_ALIGNSIZE   (sizeof(__int64_t))
   99 #define _SS_PAD1SIZE    (_SS_ALIGNSIZE - sizeof(unsigned char) - \
  100                             sizeof(sa_family_t))
  101 #define _SS_PAD2SIZE    (_SS_MAXSIZE - sizeof(unsigned char) - \
  102                             sizeof(sa_family_t) - _SS_PAD1SIZE - _SS_ALIGNSIZE)
  103 
  104 struct sockaddr_storage {
  105         unsigned char   ss_len;         /* address length */
  106         sa_family_t     ss_family;      /* address family */
  107         char            __ss_pad1[_SS_PAD1SIZE];
  108         __int64_t       __ss_align;     /* force desired struct alignment */
  109         char            __ss_pad2[_SS_PAD2SIZE];
  110 };
  111 #define _STRUCT_SOCKADDR_STORAGE_DECLARED
  112 #endif
  113 
  114 /* Socket address, internet style. */
  115 struct sockaddr_in {
  116         uint8_t sin_len;
  117         sa_family_t     sin_family;
  118         in_port_t       sin_port;
  119         struct  in_addr sin_addr;
  120         char    sin_zero[8];
  121 };
  122 
  123 #ifndef _KERNEL
  124 
  125 #ifndef _BYTEORDER_PROTOTYPED
  126 #define _BYTEORDER_PROTOTYPED
  127 __BEGIN_DECLS
  128 uint32_t        htonl(uint32_t);
  129 uint16_t        htons(uint16_t);
  130 uint32_t        ntohl(uint32_t);
  131 uint16_t        ntohs(uint16_t);
  132 __END_DECLS
  133 #endif
  134 
  135 #ifndef _BYTEORDER_FUNC_DEFINED
  136 #define _BYTEORDER_FUNC_DEFINED
  137 #define htonl(x)        __htonl(x)
  138 #define htons(x)        __htons(x)
  139 #define ntohl(x)        __ntohl(x)
  140 #define ntohs(x)        __ntohs(x)
  141 #endif
  142 
  143 #endif /* !_KERNEL */
  144 
  145 #if __POSIX_VISIBLE >= 200112
  146 #define IPPROTO_RAW             255             /* raw IP packet */
  147 #define INET_ADDRSTRLEN         16
  148 #endif
  149 
  150 #if __BSD_VISIBLE
  151 /*
  152  * Constants and structures defined by the internet system,
  153  * Per RFC 790, September 1981, and numerous additions.
  154  */
  155 
  156 /*
  157  * Protocols (RFC 1700)
  158  */
  159 #define IPPROTO_HOPOPTS         0               /* IP6 hop-by-hop options */
  160 #define IPPROTO_IGMP            2               /* group mgmt protocol */
  161 #define IPPROTO_GGP             3               /* gateway^2 (deprecated) */
  162 #define IPPROTO_IPV4            4               /* IPv4 encapsulation */
  163 #define IPPROTO_IPIP            IPPROTO_IPV4    /* for compatibility */
  164 #define IPPROTO_ST              7               /* Stream protocol II */
  165 #define IPPROTO_EGP             8               /* exterior gateway protocol */
  166 #define IPPROTO_PIGP            9               /* private interior gateway */
  167 #define IPPROTO_RCCMON          10              /* BBN RCC Monitoring */
  168 #define IPPROTO_NVPII           11              /* network voice protocol*/
  169 #define IPPROTO_PUP             12              /* pup */
  170 #define IPPROTO_ARGUS           13              /* Argus */
  171 #define IPPROTO_EMCON           14              /* EMCON */
  172 #define IPPROTO_XNET            15              /* Cross Net Debugger */
  173 #define IPPROTO_CHAOS           16              /* Chaos*/
  174 #define IPPROTO_MUX             18              /* Multiplexing */
  175 #define IPPROTO_MEAS            19              /* DCN Measurement Subsystems */
  176 #define IPPROTO_HMP             20              /* Host Monitoring */
  177 #define IPPROTO_PRM             21              /* Packet Radio Measurement */
  178 #define IPPROTO_IDP             22              /* xns idp */
  179 #define IPPROTO_TRUNK1          23              /* Trunk-1 */
  180 #define IPPROTO_TRUNK2          24              /* Trunk-2 */
  181 #define IPPROTO_LEAF1           25              /* Leaf-1 */
  182 #define IPPROTO_LEAF2           26              /* Leaf-2 */
  183 #define IPPROTO_RDP             27              /* Reliable Data */
  184 #define IPPROTO_IRTP            28              /* Reliable Transaction */
  185 #define IPPROTO_TP              29              /* tp-4 w/ class negotiation */
  186 #define IPPROTO_BLT             30              /* Bulk Data Transfer */
  187 #define IPPROTO_NSP             31              /* Network Services */
  188 #define IPPROTO_INP             32              /* Merit Internodal */
  189 #define IPPROTO_SEP             33              /* Sequential Exchange */
  190 #define IPPROTO_3PC             34              /* Third Party Connect */
  191 #define IPPROTO_IDPR            35              /* InterDomain Policy Routing */
  192 #define IPPROTO_XTP             36              /* XTP */
  193 #define IPPROTO_DDP             37              /* Datagram Delivery */
  194 #define IPPROTO_CMTP            38              /* Control Message Transport */
  195 #define IPPROTO_TPXX            39              /* TP++ Transport */
  196 #define IPPROTO_IL              40              /* IL transport protocol */
  197 #define IPPROTO_IPV6            41              /* IP6 header */
  198 #define IPPROTO_SDRP            42              /* Source Demand Routing */
  199 #define IPPROTO_ROUTING         43              /* IP6 routing header */
  200 #define IPPROTO_FRAGMENT        44              /* IP6 fragmentation header */
  201 #define IPPROTO_IDRP            45              /* InterDomain Routing*/
  202 #define IPPROTO_RSVP            46              /* resource reservation */
  203 #define IPPROTO_GRE             47              /* General Routing Encap. */
  204 #define IPPROTO_MHRP            48              /* Mobile Host Routing */
  205 #define IPPROTO_BHA             49              /* BHA */
  206 #define IPPROTO_ESP             50              /* IP6 Encap Sec. Payload */
  207 #define IPPROTO_AH              51              /* IP6 Auth Header */
  208 #define IPPROTO_INLSP           52              /* Integ. Net Layer Security */
  209 #define IPPROTO_SWIPE           53              /* IP with encryption */
  210 #define IPPROTO_NHRP            54              /* Next Hop Resolution */
  211 #define IPPROTO_MOBILE          55              /* IP Mobility */
  212 #define IPPROTO_TLSP            56              /* Transport Layer Security */
  213 #define IPPROTO_SKIP            57              /* SKIP */
  214 #define IPPROTO_ICMPV6          58              /* ICMP6 */
  215 #define IPPROTO_NONE            59              /* IP6 no next header */
  216 #define IPPROTO_DSTOPTS         60              /* IP6 destination option */
  217 #define IPPROTO_AHIP            61              /* any host internal protocol */
  218 #define IPPROTO_CFTP            62              /* CFTP */
  219 #define IPPROTO_HELLO           63              /* "hello" routing protocol */
  220 #define IPPROTO_SATEXPAK        64              /* SATNET/Backroom EXPAK */
  221 #define IPPROTO_KRYPTOLAN       65              /* Kryptolan */
  222 #define IPPROTO_RVD             66              /* Remote Virtual Disk */
  223 #define IPPROTO_IPPC            67              /* Pluribus Packet Core */
  224 #define IPPROTO_ADFS            68              /* Any distributed FS */
  225 #define IPPROTO_SATMON          69              /* Satnet Monitoring */
  226 #define IPPROTO_VISA            70              /* VISA Protocol */
  227 #define IPPROTO_IPCV            71              /* Packet Core Utility */
  228 #define IPPROTO_CPNX            72              /* Comp. Prot. Net. Executive */
  229 #define IPPROTO_CPHB            73              /* Comp. Prot. HeartBeat */
  230 #define IPPROTO_WSN             74              /* Wang Span Network */
  231 #define IPPROTO_PVP             75              /* Packet Video Protocol */
  232 #define IPPROTO_BRSATMON        76              /* BackRoom SATNET Monitoring */
  233 #define IPPROTO_ND              77              /* Sun net disk proto (temp.) */
  234 #define IPPROTO_WBMON           78              /* WIDEBAND Monitoring */
  235 #define IPPROTO_WBEXPAK         79              /* WIDEBAND EXPAK */
  236 #define IPPROTO_EON             80              /* ISO cnlp */
  237 #define IPPROTO_VMTP            81              /* VMTP */
  238 #define IPPROTO_SVMTP           82              /* Secure VMTP */
  239 #define IPPROTO_VINES           83              /* Banyon VINES */
  240 #define IPPROTO_TTP             84              /* TTP */
  241 #define IPPROTO_IGP             85              /* NSFNET-IGP */
  242 #define IPPROTO_DGP             86              /* dissimilar gateway prot. */
  243 #define IPPROTO_TCF             87              /* TCF */
  244 #define IPPROTO_IGRP            88              /* Cisco/GXS IGRP */
  245 #define IPPROTO_OSPFIGP         89              /* OSPFIGP */
  246 #define IPPROTO_SRPC            90              /* Strite RPC protocol */
  247 #define IPPROTO_LARP            91              /* Locus Address Resoloution */
  248 #define IPPROTO_MTP             92              /* Multicast Transport */
  249 #define IPPROTO_AX25            93              /* AX.25 Frames */
  250 #define IPPROTO_IPEIP           94              /* IP encapsulated in IP */
  251 #define IPPROTO_MICP            95              /* Mobile Int.ing control */
  252 #define IPPROTO_SCCSP           96              /* Semaphore Comm. security */
  253 #define IPPROTO_ETHERIP         97              /* Ethernet IP encapsulation */
  254 #define IPPROTO_ENCAP           98              /* encapsulation header */
  255 #define IPPROTO_APES            99              /* any private encr. scheme */
  256 #define IPPROTO_GMTP            100             /* GMTP*/
  257 #define IPPROTO_IPCOMP          108             /* payload compression (IPComp) */
  258 #define IPPROTO_SCTP            132             /* SCTP */
  259 /* 101-254: Partly Unassigned */
  260 #define IPPROTO_PIM             103             /* Protocol Independent Mcast */
  261 #define IPPROTO_CARP            112             /* CARP */
  262 #define IPPROTO_PGM             113             /* PGM */
  263 #define IPPROTO_PFSYNC          240             /* PFSYNC */
  264 /* 255: Reserved */
  265 /* BSD Private, local use, namespace incursion, no longer used */
  266 #define IPPROTO_OLD_DIVERT      254             /* OLD divert pseudo-proto */
  267 #define IPPROTO_MAX             256
  268 
  269 /* last return value of *_input(), meaning "all job for this pkt is done".  */
  270 #define IPPROTO_DONE            257
  271 
  272 /* Only used internally, so can be outside the range of valid IP protocols. */
  273 #define IPPROTO_DIVERT          258             /* divert pseudo-protocol */
  274 
  275 /*
  276  * Defined to avoid confusion.  The master value is defined by
  277  * PROTO_SPACER in sys/protosw.h.
  278  */
  279 #define IPPROTO_SPACER          32767           /* spacer for loadable protos */
  280 
  281 /*
  282  * Local port number conventions:
  283  *
  284  * When a user does a bind(2) or connect(2) with a port number of zero,
  285  * a non-conflicting local port address is chosen.
  286  * The default range is IPPORT_HIFIRSTAUTO through
  287  * IPPORT_HILASTAUTO, although that is settable by sysctl.
  288  *
  289  * A user may set the IPPROTO_IP option IP_PORTRANGE to change this
  290  * default assignment range.
  291  *
  292  * The value IP_PORTRANGE_DEFAULT causes the default behavior.
  293  *
  294  * The value IP_PORTRANGE_HIGH changes the range of candidate port numbers
  295  * into the "high" range.  These are reserved for client outbound connections
  296  * which do not want to be filtered by any firewalls.  Note that by default
  297  * this is the same as IP_PORTRANGE_DEFAULT.
  298  *
  299  * The value IP_PORTRANGE_LOW changes the range to the "low" are
  300  * that is (by convention) restricted to privileged processes.  This
  301  * convention is based on "vouchsafe" principles only.  It is only secure
  302  * if you trust the remote host to restrict these ports.
  303  *
  304  * The default range of ports and the high range can be changed by
  305  * sysctl(3).  (net.inet.ip.port{hi,low}{first,last}_auto)
  306  *
  307  * Changing those values has bad security implications if you are
  308  * using a stateless firewall that is allowing packets outside of that
  309  * range in order to allow transparent outgoing connections.
  310  *
  311  * Such a firewall configuration will generally depend on the use of these
  312  * default values.  If you change them, you may find your Security
  313  * Administrator looking for you with a heavy object.
  314  *
  315  * For a slightly more orthodox text view on this:
  316  *
  317  *            ftp://ftp.isi.edu/in-notes/iana/assignments/port-numbers
  318  *
  319  *    port numbers are divided into three ranges:
  320  *
  321  *                0 -  1023 Well Known Ports
  322  *             1024 - 49151 Registered Ports
  323  *            49152 - 65535 Dynamic and/or Private Ports
  324  *
  325  */
  326 
  327 /*
  328  * Ports < IPPORT_RESERVED are reserved for
  329  * privileged processes (e.g. root).         (IP_PORTRANGE_LOW)
  330  */
  331 #define IPPORT_RESERVED         1024
  332 
  333 /*
  334  * Default local port range, used by both IP_PORTRANGE_DEFAULT
  335  * and IP_PORTRANGE_HIGH.
  336  */
  337 #define IPPORT_HIFIRSTAUTO      49152
  338 #define IPPORT_HILASTAUTO       65535
  339 
  340 /*
  341  * Scanning for a free reserved port return a value below IPPORT_RESERVED,
  342  * but higher than IPPORT_RESERVEDSTART.  Traditionally the start value was
  343  * 512, but that conflicts with some well-known-services that firewalls may
  344  * have a fit if we use.
  345  */
  346 #define IPPORT_RESERVEDSTART    600
  347 
  348 #define IPPORT_MAX              65535
  349 
  350 /*
  351  * Definitions of bits in internet address integers.
  352  * On subnets, the decomposition of addresses to host and net parts
  353  * is done according to subnet mask, not the masks here.
  354  */
  355 #define IN_CLASSA(i)            (((u_int32_t)(i) & 0x80000000) == 0)
  356 #define IN_CLASSA_NET           0xff000000
  357 #define IN_CLASSA_NSHIFT        24
  358 #define IN_CLASSA_HOST          0x00ffffff
  359 #define IN_CLASSA_MAX           128
  360 
  361 #define IN_CLASSB(i)            (((u_int32_t)(i) & 0xc0000000) == 0x80000000)
  362 #define IN_CLASSB_NET           0xffff0000
  363 #define IN_CLASSB_NSHIFT        16
  364 #define IN_CLASSB_HOST          0x0000ffff
  365 #define IN_CLASSB_MAX           65536
  366 
  367 #define IN_CLASSC(i)            (((u_int32_t)(i) & 0xe0000000) == 0xc0000000)
  368 #define IN_CLASSC_NET           0xffffff00
  369 #define IN_CLASSC_NSHIFT        8
  370 #define IN_CLASSC_HOST          0x000000ff
  371 
  372 #define IN_CLASSD(i)            (((u_int32_t)(i) & 0xf0000000) == 0xe0000000)
  373 #define IN_CLASSD_NET           0xf0000000      /* These ones aren't really */
  374 #define IN_CLASSD_NSHIFT        28              /* net and host fields, but */
  375 #define IN_CLASSD_HOST          0x0fffffff      /* routing needn't know.    */
  376 #define IN_MULTICAST(i)         IN_CLASSD(i)
  377 
  378 #define IN_EXPERIMENTAL(i)      (((u_int32_t)(i) & 0xf0000000) == 0xf0000000)
  379 #define IN_BADCLASS(i)          (((u_int32_t)(i) & 0xf0000000) == 0xf0000000)
  380 
  381 #define IN_LINKLOCAL(i)         (((u_int32_t)(i) & 0xffff0000) == 0xa9fe0000)
  382 #define IN_LOOPBACK(i)          (((u_int32_t)(i) & 0xff000000) == 0x7f000000)
  383 #define IN_ZERONET(i)           (((u_int32_t)(i) & 0xff000000) == 0)
  384 
  385 #define IN_PRIVATE(i)   ((((u_int32_t)(i) & 0xff000000) == 0x0a000000) || \
  386                          (((u_int32_t)(i) & 0xfff00000) == 0xac100000) || \
  387                          (((u_int32_t)(i) & 0xffff0000) == 0xc0a80000))
  388 
  389 #define IN_LOCAL_GROUP(i)       (((u_int32_t)(i) & 0xffffff00) == 0xe0000000)
  390  
  391 #define IN_ANY_LOCAL(i)         (IN_LINKLOCAL(i) || IN_LOCAL_GROUP(i))
  392 
  393 #define INADDR_LOOPBACK         (u_int32_t)0x7f000001
  394 #ifndef _KERNEL
  395 #define INADDR_NONE             0xffffffff              /* -1 return */
  396 #endif
  397 
  398 #define INADDR_UNSPEC_GROUP     (u_int32_t)0xe0000000   /* 224.0.0.0 */
  399 #define INADDR_ALLHOSTS_GROUP   (u_int32_t)0xe0000001   /* 224.0.0.1 */
  400 #define INADDR_ALLRTRS_GROUP    (u_int32_t)0xe0000002   /* 224.0.0.2 */
  401 #define INADDR_ALLRPTS_GROUP    (u_int32_t)0xe0000016   /* 224.0.0.22, IGMPv3 */
  402 #define INADDR_CARP_GROUP       (u_int32_t)0xe0000012   /* 224.0.0.18 */
  403 #define INADDR_PFSYNC_GROUP     (u_int32_t)0xe00000f0   /* 224.0.0.240 */
  404 #define INADDR_ALLMDNS_GROUP    (u_int32_t)0xe00000fb   /* 224.0.0.251 */
  405 #define INADDR_MAX_LOCAL_GROUP  (u_int32_t)0xe00000ff   /* 224.0.0.255 */
  406 
  407 #define IN_LOOPBACKNET          127                     /* official! */
  408 
  409 /*
  410  * Options for use with [gs]etsockopt at the IP level.
  411  * First word of comment is data type; bool is stored in int.
  412  */
  413 #define IP_OPTIONS              1    /* buf/ip_opts; set/get IP options */
  414 #define IP_HDRINCL              2    /* int; header is included with data */
  415 #define IP_TOS                  3    /* int; IP type of service and preced. */
  416 #define IP_TTL                  4    /* int; IP time to live */
  417 #define IP_RECVOPTS             5    /* bool; receive all IP opts w/dgram */
  418 #define IP_RECVRETOPTS          6    /* bool; receive IP opts for response */
  419 #define IP_RECVDSTADDR          7    /* bool; receive IP dst addr w/dgram */
  420 #define IP_SENDSRCADDR          IP_RECVDSTADDR /* cmsg_type to set src addr */
  421 #define IP_RETOPTS              8    /* ip_opts; set/get IP options */
  422 #define IP_MULTICAST_IF         9    /* struct in_addr *or* struct ip_mreqn;
  423                                       * set/get IP multicast i/f  */
  424 #define IP_MULTICAST_TTL        10   /* u_char; set/get IP multicast ttl */
  425 #define IP_MULTICAST_LOOP       11   /* u_char; set/get IP multicast loopback */
  426 #define IP_ADD_MEMBERSHIP       12   /* ip_mreq; add an IP group membership */
  427 #define IP_DROP_MEMBERSHIP      13   /* ip_mreq; drop an IP group membership */
  428 #define IP_MULTICAST_VIF        14   /* set/get IP mcast virt. iface */
  429 #define IP_RSVP_ON              15   /* enable RSVP in kernel */
  430 #define IP_RSVP_OFF             16   /* disable RSVP in kernel */
  431 #define IP_RSVP_VIF_ON          17   /* set RSVP per-vif socket */
  432 #define IP_RSVP_VIF_OFF         18   /* unset RSVP per-vif socket */
  433 #define IP_PORTRANGE            19   /* int; range to choose for unspec port */
  434 #define IP_RECVIF               20   /* bool; receive reception if w/dgram */
  435 /* for IPSEC */
  436 #define IP_IPSEC_POLICY         21   /* int; set/get security policy */
  437 #define IP_FAITH                22   /* bool; accept FAITH'ed connections */
  438 
  439 #define IP_ONESBCAST            23   /* bool: send all-ones broadcast */
  440 
  441 /*
  442  * Options for controlling the firewall and dummynet.
  443  * Historical options (from 40 to 64) will eventually be
  444  * replaced by only two options, IP_FW3 and IP_DUMMYNET3.
  445  */
  446 #define IP_FW_TABLE_ADD         40   /* add entry */
  447 #define IP_FW_TABLE_DEL         41   /* delete entry */
  448 #define IP_FW_TABLE_FLUSH       42   /* flush table */
  449 #define IP_FW_TABLE_GETSIZE     43   /* get table size */
  450 #define IP_FW_TABLE_LIST        44   /* list table contents */
  451 
  452 #define IP_FW3                  48   /* generic ipfw v.3 sockopts */
  453 #define IP_DUMMYNET3            49   /* generic dummynet v.3 sockopts */
  454 
  455 #define IP_FW_ADD               50   /* add a firewall rule to chain */
  456 #define IP_FW_DEL               51   /* delete a firewall rule from chain */
  457 #define IP_FW_FLUSH             52   /* flush firewall rule chain */
  458 #define IP_FW_ZERO              53   /* clear single/all firewall counter(s) */
  459 #define IP_FW_GET               54   /* get entire firewall rule chain */
  460 #define IP_FW_RESETLOG          55   /* reset logging counters */
  461 
  462 #define IP_FW_NAT_CFG           56   /* add/config a nat rule */
  463 #define IP_FW_NAT_DEL           57   /* delete a nat rule */
  464 #define IP_FW_NAT_GET_CONFIG    58   /* get configuration of a nat rule */
  465 #define IP_FW_NAT_GET_LOG       59   /* get log of a nat rule */
  466 
  467 #define IP_DUMMYNET_CONFIGURE   60   /* add/configure a dummynet pipe */
  468 #define IP_DUMMYNET_DEL         61   /* delete a dummynet pipe from chain */
  469 #define IP_DUMMYNET_FLUSH       62   /* flush dummynet */
  470 #define IP_DUMMYNET_GET         64   /* get entire dummynet pipes */
  471 
  472 #define IP_RECVTTL              65   /* bool; receive IP TTL w/dgram */
  473 #define IP_MINTTL               66   /* minimum TTL for packet or drop */
  474 #define IP_DONTFRAG             67   /* don't fragment packet */
  475 
  476 /* IPv4 Source Filter Multicast API [RFC3678] */
  477 #define IP_ADD_SOURCE_MEMBERSHIP        70   /* join a source-specific group */
  478 #define IP_DROP_SOURCE_MEMBERSHIP       71   /* drop a single source */
  479 #define IP_BLOCK_SOURCE                 72   /* block a source */
  480 #define IP_UNBLOCK_SOURCE               73   /* unblock a source */
  481 
  482 /* The following option is private; do not use it from user applications. */
  483 #define IP_MSFILTER                     74   /* set/get filter list */
  484 
  485 /* Protocol Independent Multicast API [RFC3678] */
  486 #define MCAST_JOIN_GROUP                80   /* join an any-source group */
  487 #define MCAST_LEAVE_GROUP               81   /* leave all sources for group */
  488 #define MCAST_JOIN_SOURCE_GROUP         82   /* join a source-specific group */
  489 #define MCAST_LEAVE_SOURCE_GROUP        83   /* leave a single source */
  490 #define MCAST_BLOCK_SOURCE              84   /* block a source */
  491 #define MCAST_UNBLOCK_SOURCE            85   /* unblock a source */
  492 
  493 /*
  494  * Defaults and limits for options
  495  */
  496 #define IP_DEFAULT_MULTICAST_TTL  1     /* normally limit m'casts to 1 hop  */
  497 #define IP_DEFAULT_MULTICAST_LOOP 1     /* normally hear sends if a member  */
  498 
  499 /*
  500  * The imo_membership vector for each socket is now dynamically allocated at
  501  * run-time, bounded by USHRT_MAX, and is reallocated when needed, sized
  502  * according to a power-of-two increment.
  503  */
  504 #define IP_MIN_MEMBERSHIPS      31
  505 #define IP_MAX_MEMBERSHIPS      4095
  506 #define IP_MAX_SOURCE_FILTER    1024    /* # of filters per socket, per group */
  507 
  508 /*
  509  * Argument structure for IP_ADD_MEMBERSHIP and IP_DROP_MEMBERSHIP.
  510  */
  511 struct ip_mreq {
  512         struct  in_addr imr_multiaddr;  /* IP multicast address of group */
  513         struct  in_addr imr_interface;  /* local IP address of interface */
  514 };
  515 
  516 /*
  517  * Modified argument structure for IP_MULTICAST_IF, obtained from Linux.
  518  * This is used to specify an interface index for multicast sends, as
  519  * the IPv4 legacy APIs do not support this (unless IP_SENDIF is available).
  520  */
  521 struct ip_mreqn {
  522         struct  in_addr imr_multiaddr;  /* IP multicast address of group */
  523         struct  in_addr imr_address;    /* local IP address of interface */
  524         int             imr_ifindex;    /* Interface index; cast to uint32_t */
  525 };
  526 
  527 /*
  528  * Argument structure for IPv4 Multicast Source Filter APIs. [RFC3678]
  529  */
  530 struct ip_mreq_source {
  531         struct  in_addr imr_multiaddr;  /* IP multicast address of group */
  532         struct  in_addr imr_sourceaddr; /* IP address of source */
  533         struct  in_addr imr_interface;  /* local IP address of interface */
  534 };
  535 
  536 /*
  537  * Argument structures for Protocol-Independent Multicast Source
  538  * Filter APIs. [RFC3678]
  539  */
  540 struct group_req {
  541         uint32_t                gr_interface;   /* interface index */
  542         struct sockaddr_storage gr_group;       /* group address */
  543 };
  544 
  545 struct group_source_req {
  546         uint32_t                gsr_interface;  /* interface index */
  547         struct sockaddr_storage gsr_group;      /* group address */
  548         struct sockaddr_storage gsr_source;     /* source address */
  549 };
  550 
  551 #ifndef __MSFILTERREQ_DEFINED
  552 #define __MSFILTERREQ_DEFINED
  553 /*
  554  * The following structure is private; do not use it from user applications.
  555  * It is used to communicate IP_MSFILTER/IPV6_MSFILTER information between
  556  * the RFC 3678 libc functions and the kernel.
  557  */
  558 struct __msfilterreq {
  559         uint32_t                 msfr_ifindex;  /* interface index */
  560         uint32_t                 msfr_fmode;    /* filter mode for group */
  561         uint32_t                 msfr_nsrcs;    /* # of sources in msfr_srcs */
  562         struct sockaddr_storage  msfr_group;    /* group address */
  563         struct sockaddr_storage *msfr_srcs;     /* pointer to the first member
  564                                                  * of a contiguous array of
  565                                                  * sources to filter in full.
  566                                                  */
  567 };
  568 #endif
  569 
  570 struct sockaddr;
  571 
  572 /*
  573  * Advanced (Full-state) APIs [RFC3678]
  574  * The RFC specifies uint_t for the 6th argument to [sg]etsourcefilter().
  575  * We use uint32_t here to be consistent.
  576  */
  577 int     setipv4sourcefilter(int, struct in_addr, struct in_addr, uint32_t,
  578             uint32_t, struct in_addr *);
  579 int     getipv4sourcefilter(int, struct in_addr, struct in_addr, uint32_t *,
  580             uint32_t *, struct in_addr *);
  581 int     setsourcefilter(int, uint32_t, struct sockaddr *, socklen_t,
  582             uint32_t, uint32_t, struct sockaddr_storage *);
  583 int     getsourcefilter(int, uint32_t, struct sockaddr *, socklen_t,
  584             uint32_t *, uint32_t *, struct sockaddr_storage *);
  585 
  586 /*
  587  * Filter modes; also used to represent per-socket filter mode internally.
  588  */
  589 #define MCAST_INCLUDE   1       /* fmode: include these source(s) */
  590 #define MCAST_EXCLUDE   2       /* fmode: exclude these source(s) */
  591 
  592 /*
  593  * Argument for IP_PORTRANGE:
  594  * - which range to search when port is unspecified at bind() or connect()
  595  */
  596 #define IP_PORTRANGE_DEFAULT    0       /* default range */
  597 #define IP_PORTRANGE_HIGH       1       /* "high" - request firewall bypass */
  598 #define IP_PORTRANGE_LOW        2       /* "low" - vouchsafe security */
  599 
  600 /*
  601  * Definitions for inet sysctl operations.
  602  *
  603  * Third level is protocol number.
  604  * Fourth level is desired variable within that protocol.
  605  */
  606 #define IPPROTO_MAXID   (IPPROTO_AH + 1)        /* don't list to IPPROTO_MAX */
  607 
  608 #define CTL_IPPROTO_NAMES { \
  609         { "ip", CTLTYPE_NODE }, \
  610         { "icmp", CTLTYPE_NODE }, \
  611         { "igmp", CTLTYPE_NODE }, \
  612         { "ggp", CTLTYPE_NODE }, \
  613         { 0, 0 }, \
  614         { 0, 0 }, \
  615         { "tcp", CTLTYPE_NODE }, \
  616         { 0, 0 }, \
  617         { "egp", CTLTYPE_NODE }, \
  618         { 0, 0 }, \
  619         { 0, 0 }, \
  620         { 0, 0 }, \
  621         { "pup", CTLTYPE_NODE }, \
  622         { 0, 0 }, \
  623         { 0, 0 }, \
  624         { 0, 0 }, \
  625         { 0, 0 }, \
  626         { "udp", CTLTYPE_NODE }, \
  627         { 0, 0 }, \
  628         { 0, 0 }, \
  629         { 0, 0 }, \
  630         { 0, 0 }, \
  631         { "idp", CTLTYPE_NODE }, \
  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         { 0, 0 }, \
  660         { "ipsec", CTLTYPE_NODE }, \
  661         { 0, 0 }, \
  662         { 0, 0 }, \
  663         { 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 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
  673         { 0, 0 }, \
  674         { 0, 0 }, \
  675         { 0, 0 }, \
  676         { "pim", CTLTYPE_NODE }, \
  677 }
  678 
  679 /*
  680  * Names for IP sysctl objects
  681  */
  682 #define IPCTL_FORWARDING        1       /* act as router */
  683 #define IPCTL_SENDREDIRECTS     2       /* may send redirects when forwarding */
  684 #define IPCTL_DEFTTL            3       /* default TTL */
  685 #ifdef notyet
  686 #define IPCTL_DEFMTU            4       /* default MTU */
  687 #endif
  688 #define IPCTL_RTEXPIRE          5       /* cloned route expiration time */
  689 #define IPCTL_RTMINEXPIRE       6       /* min value for expiration time */
  690 #define IPCTL_RTMAXCACHE        7       /* trigger level for dynamic expire */
  691 #define IPCTL_SOURCEROUTE       8       /* may perform source routes */
  692 #define IPCTL_DIRECTEDBROADCAST 9       /* may re-broadcast received packets */
  693 #define IPCTL_INTRQMAXLEN       10      /* max length of netisr queue */
  694 #define IPCTL_INTRQDROPS        11      /* number of netisr q drops */
  695 #define IPCTL_STATS             12      /* ipstat structure */
  696 #define IPCTL_ACCEPTSOURCEROUTE 13      /* may accept source routed packets */
  697 #define IPCTL_FASTFORWARDING    14      /* use fast IP forwarding code */
  698 #define IPCTL_KEEPFAITH         15      /* FAITH IPv4->IPv6 translater ctl */
  699 #define IPCTL_GIF_TTL           16      /* default TTL for gif encap packet */
  700 #define IPCTL_MAXID             17
  701 
  702 #define IPCTL_NAMES { \
  703         { 0, 0 }, \
  704         { "forwarding", CTLTYPE_INT }, \
  705         { "redirect", CTLTYPE_INT }, \
  706         { "ttl", CTLTYPE_INT }, \
  707         { "mtu", CTLTYPE_INT }, \
  708         { "rtexpire", CTLTYPE_INT }, \
  709         { "rtminexpire", CTLTYPE_INT }, \
  710         { "rtmaxcache", CTLTYPE_INT }, \
  711         { "sourceroute", CTLTYPE_INT }, \
  712         { "directed-broadcast", CTLTYPE_INT }, \
  713         { "intr-queue-maxlen", CTLTYPE_INT }, \
  714         { "intr-queue-drops", CTLTYPE_INT }, \
  715         { "stats", CTLTYPE_STRUCT }, \
  716         { "accept_sourceroute", CTLTYPE_INT }, \
  717         { "fastforwarding", CTLTYPE_INT }, \
  718 }
  719 
  720 #endif /* __BSD_VISIBLE */
  721 
  722 #ifdef _KERNEL
  723 
  724 struct ifnet; struct mbuf;      /* forward declarations for Standard C */
  725 
  726 int      in_broadcast(struct in_addr, struct ifnet *);
  727 int      in_canforward(struct in_addr);
  728 int      in_localaddr(struct in_addr);
  729 int      in_localip(struct in_addr);
  730 char    *inet_ntoa(struct in_addr); /* in libkern */
  731 char    *inet_ntoa_r(struct in_addr ina, char *buf); /* in libkern */
  732 void     in_ifdetach(struct ifnet *);
  733 
  734 #define in_hosteq(s, t) ((s).s_addr == (t).s_addr)
  735 #define in_nullhost(x)  ((x).s_addr == INADDR_ANY)
  736 
  737 #define satosin(sa)     ((struct sockaddr_in *)(sa))
  738 #define sintosa(sin)    ((struct sockaddr *)(sin))
  739 #define ifatoia(ifa)    ((struct in_ifaddr *)(ifa))
  740 
  741 #endif /* _KERNEL */
  742 
  743 /* INET6 stuff */
  744 #if __POSIX_VISIBLE >= 200112
  745 #define __KAME_NETINET_IN_H_INCLUDED_
  746 #include <netinet6/in6.h>
  747 #undef __KAME_NETINET_IN_H_INCLUDED_
  748 #endif
  749 
  750 #endif /* !_NETINET_IN_H_*/

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