FreeBSD/Linux Kernel Cross Reference
sys/netinet/in.h

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1982, 1986, 1990, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)in.h        8.3 (Berkeley) 1/3/94
     * $FreeBSD$
     */
    
    #ifndef _NETINET_IN_H_
    #define _NETINET_IN_H_
    
    #include <sys/cdefs.h>
    #include <sys/_types.h>
    #include <machine/endian.h>
    
    /* Protocols common to RFC 1700, POSIX, and X/Open. */
    #define IPPROTO_IP              0               /* dummy for IP */
    #define IPPROTO_ICMP            1               /* control message protocol */
    #define IPPROTO_TCP             6               /* tcp */
    #define IPPROTO_UDP             17              /* user datagram protocol */
    
    #define INADDR_ANY              ((in_addr_t)0x00000000)
    #define INADDR_BROADCAST        ((in_addr_t)0xffffffff) /* must be masked */
    
    #ifndef _UINT8_T_DECLARED
    typedef __uint8_t               uint8_t;
    #define _UINT8_T_DECLARED
    #endif
    
    #ifndef _UINT16_T_DECLARED
    typedef __uint16_t              uint16_t;
    #define _UINT16_T_DECLARED
    #endif
    
    #ifndef _UINT32_T_DECLARED
    typedef __uint32_t              uint32_t;
    #define _UINT32_T_DECLARED
    #endif
    
    #ifndef _IN_ADDR_T_DECLARED
    typedef uint32_t                in_addr_t;
    #define _IN_ADDR_T_DECLARED
    #endif
    
    #ifndef _IN_PORT_T_DECLARED
    typedef uint16_t                in_port_t;
    #define _IN_PORT_T_DECLARED
    #endif
    
    #ifndef _SA_FAMILY_T_DECLARED
    typedef __sa_family_t           sa_family_t;
    #define _SA_FAMILY_T_DECLARED
    #endif
    
    /* Internet address (a structure for historical reasons). */
    #ifndef _STRUCT_IN_ADDR_DECLARED
    struct in_addr {
            in_addr_t s_addr;
    };
    #define _STRUCT_IN_ADDR_DECLARED
    #endif
    
    #ifndef _SOCKLEN_T_DECLARED
    typedef __socklen_t     socklen_t;
    #define _SOCKLEN_T_DECLARED
    #endif
    
    #include <sys/_sockaddr_storage.h>
    
    /* Socket address, internet style. */
    struct sockaddr_in {
            uint8_t sin_len;
            sa_family_t     sin_family;
           in_port_t       sin_port;
           struct  in_addr sin_addr;
           char    sin_zero[8];
   };
   
   #if !defined(_KERNEL) && __POSIX_VISIBLE >= 200112
   
   #ifndef _BYTEORDER_PROTOTYPED
   #define _BYTEORDER_PROTOTYPED
   __BEGIN_DECLS
   uint32_t        htonl(uint32_t);
   uint16_t        htons(uint16_t);
   uint32_t        ntohl(uint32_t);
   uint16_t        ntohs(uint16_t);
   __END_DECLS
   #endif
   
   #ifndef _BYTEORDER_FUNC_DEFINED
   #define _BYTEORDER_FUNC_DEFINED
   #define htonl(x)        __htonl(x)
   #define htons(x)        __htons(x)
   #define ntohl(x)        __ntohl(x)
   #define ntohs(x)        __ntohs(x)
   #endif
   
   #endif /* !_KERNEL && __POSIX_VISIBLE >= 200112 */
   
   #if __POSIX_VISIBLE >= 200112
   #define IPPROTO_IPV6            41              /* IP6 header */
   #define IPPROTO_RAW             255             /* raw IP packet */
   #define INET_ADDRSTRLEN         16
   #endif
   
   #if __BSD_VISIBLE
   /*
    * Constants and structures defined by the internet system,
    * Per RFC 790, September 1981, and numerous additions.
    */
   
   /*
    * Protocols (RFC 1700)
    */
   #define IPPROTO_HOPOPTS         0               /* IP6 hop-by-hop options */
   #define IPPROTO_IGMP            2               /* group mgmt protocol */
   #define IPPROTO_GGP             3               /* gateway^2 (deprecated) */
   #define IPPROTO_IPV4            4               /* IPv4 encapsulation */
   #define IPPROTO_IPIP            IPPROTO_IPV4    /* for compatibility */
   #define IPPROTO_ST              7               /* Stream protocol II */
   #define IPPROTO_EGP             8               /* exterior gateway protocol */
   #define IPPROTO_PIGP            9               /* private interior gateway */
   #define IPPROTO_RCCMON          10              /* BBN RCC Monitoring */
   #define IPPROTO_NVPII           11              /* network voice protocol*/
   #define IPPROTO_PUP             12              /* pup */
   #define IPPROTO_ARGUS           13              /* Argus */
   #define IPPROTO_EMCON           14              /* EMCON */
   #define IPPROTO_XNET            15              /* Cross Net Debugger */
   #define IPPROTO_CHAOS           16              /* Chaos*/
   #define IPPROTO_MUX             18              /* Multiplexing */
   #define IPPROTO_MEAS            19              /* DCN Measurement Subsystems */
   #define IPPROTO_HMP             20              /* Host Monitoring */
   #define IPPROTO_PRM             21              /* Packet Radio Measurement */
   #define IPPROTO_IDP             22              /* xns idp */
   #define IPPROTO_TRUNK1          23              /* Trunk-1 */
   #define IPPROTO_TRUNK2          24              /* Trunk-2 */
   #define IPPROTO_LEAF1           25              /* Leaf-1 */
   #define IPPROTO_LEAF2           26              /* Leaf-2 */
   #define IPPROTO_RDP             27              /* Reliable Data */
   #define IPPROTO_IRTP            28              /* Reliable Transaction */
   #define IPPROTO_TP              29              /* tp-4 w/ class negotiation */
   #define IPPROTO_BLT             30              /* Bulk Data Transfer */
   #define IPPROTO_NSP             31              /* Network Services */
   #define IPPROTO_INP             32              /* Merit Internodal */
   #define IPPROTO_DCCP            33              /* Datagram Congestion Control Protocol */
   #define IPPROTO_3PC             34              /* Third Party Connect */
   #define IPPROTO_IDPR            35              /* InterDomain Policy Routing */
   #define IPPROTO_XTP             36              /* XTP */
   #define IPPROTO_DDP             37              /* Datagram Delivery */
   #define IPPROTO_CMTP            38              /* Control Message Transport */
   #define IPPROTO_TPXX            39              /* TP++ Transport */
   #define IPPROTO_IL              40              /* IL transport protocol */
   #define IPPROTO_SDRP            42              /* Source Demand Routing */
   #define IPPROTO_ROUTING         43              /* IP6 routing header */
   #define IPPROTO_FRAGMENT        44              /* IP6 fragmentation header */
   #define IPPROTO_IDRP            45              /* InterDomain Routing*/
   #define IPPROTO_RSVP            46              /* resource reservation */
   #define IPPROTO_GRE             47              /* General Routing Encap. */
   #define IPPROTO_MHRP            48              /* Mobile Host Routing */
   #define IPPROTO_BHA             49              /* BHA */
   #define IPPROTO_ESP             50              /* IP6 Encap Sec. Payload */
   #define IPPROTO_AH              51              /* IP6 Auth Header */
   #define IPPROTO_INLSP           52              /* Integ. Net Layer Security */
   #define IPPROTO_SWIPE           53              /* IP with encryption */
   #define IPPROTO_NHRP            54              /* Next Hop Resolution */
   #define IPPROTO_MOBILE          55              /* IP Mobility */
   #define IPPROTO_TLSP            56              /* Transport Layer Security */
   #define IPPROTO_SKIP            57              /* SKIP */
   #define IPPROTO_ICMPV6          58              /* ICMP6 */
   #define IPPROTO_NONE            59              /* IP6 no next header */
   #define IPPROTO_DSTOPTS         60              /* IP6 destination option */
   #define IPPROTO_AHIP            61              /* any host internal protocol */
   #define IPPROTO_CFTP            62              /* CFTP */
   #define IPPROTO_HELLO           63              /* "hello" routing protocol */
   #define IPPROTO_SATEXPAK        64              /* SATNET/Backroom EXPAK */
   #define IPPROTO_KRYPTOLAN       65              /* Kryptolan */
   #define IPPROTO_RVD             66              /* Remote Virtual Disk */
   #define IPPROTO_IPPC            67              /* Pluribus Packet Core */
   #define IPPROTO_ADFS            68              /* Any distributed FS */
   #define IPPROTO_SATMON          69              /* Satnet Monitoring */
   #define IPPROTO_VISA            70              /* VISA Protocol */
   #define IPPROTO_IPCV            71              /* Packet Core Utility */
   #define IPPROTO_CPNX            72              /* Comp. Prot. Net. Executive */
   #define IPPROTO_CPHB            73              /* Comp. Prot. HeartBeat */
   #define IPPROTO_WSN             74              /* Wang Span Network */
   #define IPPROTO_PVP             75              /* Packet Video Protocol */
   #define IPPROTO_BRSATMON        76              /* BackRoom SATNET Monitoring */
   #define IPPROTO_ND              77              /* Sun net disk proto (temp.) */
   #define IPPROTO_WBMON           78              /* WIDEBAND Monitoring */
   #define IPPROTO_WBEXPAK         79              /* WIDEBAND EXPAK */
   #define IPPROTO_EON             80              /* ISO cnlp */
   #define IPPROTO_VMTP            81              /* VMTP */
   #define IPPROTO_SVMTP           82              /* Secure VMTP */
   #define IPPROTO_VINES           83              /* Banyon VINES */
   #define IPPROTO_TTP             84              /* TTP */
   #define IPPROTO_IGP             85              /* NSFNET-IGP */
   #define IPPROTO_DGP             86              /* dissimilar gateway prot. */
   #define IPPROTO_TCF             87              /* TCF */
   #define IPPROTO_IGRP            88              /* Cisco/GXS IGRP */
   #define IPPROTO_OSPFIGP         89              /* OSPFIGP */
   #define IPPROTO_SRPC            90              /* Strite RPC protocol */
   #define IPPROTO_LARP            91              /* Locus Address Resoloution */
   #define IPPROTO_MTP             92              /* Multicast Transport */
   #define IPPROTO_AX25            93              /* AX.25 Frames */
   #define IPPROTO_IPEIP           94              /* IP encapsulated in IP */
   #define IPPROTO_MICP            95              /* Mobile Int.ing control */
   #define IPPROTO_SCCSP           96              /* Semaphore Comm. security */
   #define IPPROTO_ETHERIP         97              /* Ethernet IP encapsulation */
   #define IPPROTO_ENCAP           98              /* encapsulation header */
   #define IPPROTO_APES            99              /* any private encr. scheme */
   #define IPPROTO_GMTP            100             /* GMTP*/
   #define IPPROTO_IPCOMP          108             /* payload compression (IPComp) */
   #define IPPROTO_SCTP            132             /* SCTP */
   #define IPPROTO_MH              135             /* IPv6 Mobility Header */
   #define IPPROTO_UDPLITE         136             /* UDP-Lite */
   #define IPPROTO_HIP             139             /* IP6 Host Identity Protocol */
   #define IPPROTO_SHIM6           140             /* IP6 Shim6 Protocol */
   /* 101-254: Partly Unassigned */
   #define IPPROTO_PIM             103             /* Protocol Independent Mcast */
   #define IPPROTO_CARP            112             /* CARP */
   #define IPPROTO_PGM             113             /* PGM */
   #define IPPROTO_MPLS            137             /* MPLS-in-IP */
   #define IPPROTO_PFSYNC          240             /* PFSYNC */
   #define IPPROTO_RESERVED_253    253             /* Reserved */
   #define IPPROTO_RESERVED_254    254             /* Reserved */
   /* 255: Reserved */
   /* BSD Private, local use, namespace incursion, no longer used */
   #define IPPROTO_OLD_DIVERT      254             /* OLD divert pseudo-proto */
   #define IPPROTO_MAX             256
   
   /* last return value of *_input(), meaning "all job for this pkt is done".  */
   #define IPPROTO_DONE            257
   
   /* Only used internally, so can be outside the range of valid IP protocols. */
   #define IPPROTO_DIVERT          258             /* divert pseudo-protocol */
   #define IPPROTO_SEND            259             /* SeND pseudo-protocol */
   
   /*
    * Defined to avoid confusion.  The master value is defined by
    * PROTO_SPACER in sys/protosw.h.
    */
   #define IPPROTO_SPACER          32767           /* spacer for loadable protos */
   
   /*
    * Local port number conventions:
    *
    * When a user does a bind(2) or connect(2) with a port number of zero,
    * a non-conflicting local port address is chosen.
    * The default range is IPPORT_HIFIRSTAUTO through
    * IPPORT_HILASTAUTO, although that is settable by sysctl.
    *
    * A user may set the IPPROTO_IP option IP_PORTRANGE to change this
    * default assignment range.
    *
    * The value IP_PORTRANGE_DEFAULT causes the default behavior.
    *
    * The value IP_PORTRANGE_HIGH changes the range of candidate port numbers
    * into the "high" range.  These are reserved for client outbound connections
    * which do not want to be filtered by any firewalls.
    *
    * The value IP_PORTRANGE_LOW changes the range to the "low" are
    * that is (by convention) restricted to privileged processes.  This
    * convention is based on "vouchsafe" principles only.  It is only secure
    * if you trust the remote host to restrict these ports.
    *
    * The default range of ports and the high range can be changed by
    * sysctl(3).  (net.inet.ip.portrange.{hi,low,}{first,last})
    *
    * Changing those values has bad security implications if you are
    * using a stateless firewall that is allowing packets outside of that
    * range in order to allow transparent outgoing connections.
    *
    * Such a firewall configuration will generally depend on the use of these
    * default values.  If you change them, you may find your Security
    * Administrator looking for you with a heavy object.
    *
    * For a slightly more orthodox text view on this:
    *
    *            ftp://ftp.isi.edu/in-notes/iana/assignments/port-numbers
    *
    *    port numbers are divided into three ranges:
    *
    *                0 -  1023 Well Known Ports
    *             1024 - 49151 Registered Ports
    *            49152 - 65535 Dynamic and/or Private Ports
    *
    */
   
   /*
    * Ports < IPPORT_RESERVED are reserved for
    * privileged processes (e.g. root).         (IP_PORTRANGE_LOW)
    */
   #define IPPORT_RESERVED         1024
   
   /*
    * Default local port range, used by IP_PORTRANGE_DEFAULT
    */
   #define IPPORT_EPHEMERALFIRST   10000
   #define IPPORT_EPHEMERALLAST    65535
   
   /*
    * Dynamic port range, used by IP_PORTRANGE_HIGH.
    */
   #define IPPORT_HIFIRSTAUTO      49152
   #define IPPORT_HILASTAUTO       65535
   
   /*
    * Scanning for a free reserved port return a value below IPPORT_RESERVED,
    * but higher than IPPORT_RESERVEDSTART.  Traditionally the start value was
    * 512, but that conflicts with some well-known-services that firewalls may
    * have a fit if we use.
    */
   #define IPPORT_RESERVEDSTART    600
   
   #define IPPORT_MAX              65535
   
   /*
    * Historical definitions of bits in internet address integers
    * (pre-CIDR).  Class A/B/C are long obsolete, and now deprecated.
    * Hide these definitions from the kernel unless IN_HISTORICAL_NETS
    * is defined.  Provide the historical definitions to user level for now.
    */
   #ifndef _KERNEL
   #define IN_HISTORICAL_NETS
   #endif
   #ifdef IN_HISTORICAL_NETS
   #define IN_CLASSA(i)            (((in_addr_t)(i) & 0x80000000) == 0)
   #define IN_CLASSA_NET           0xff000000
   #define IN_CLASSA_NSHIFT        24
   #define IN_CLASSA_HOST          0x00ffffff
   #define IN_CLASSA_MAX           128
   
   #define IN_CLASSB(i)            (((in_addr_t)(i) & 0xc0000000) == 0x80000000)
   #define IN_CLASSB_NET           0xffff0000
   #define IN_CLASSB_NSHIFT        16
   #define IN_CLASSB_HOST          0x0000ffff
   #define IN_CLASSB_MAX           65536
   
   #define IN_CLASSC(i)            (((in_addr_t)(i) & 0xe0000000) == 0xc0000000)
   #define IN_CLASSC_NET           0xffffff00
   #define IN_CLASSC_NSHIFT        8
   #define IN_CLASSC_HOST          0x000000ff
   #endif /* IN_HISTORICAL_NETS */
   
   #define IN_NETMASK_DEFAULT      0xffffff00      /* mask when forced to guess */
   
   #define IN_MULTICAST(i)         (((in_addr_t)(i) & 0xf0000000) == 0xe0000000)
   #ifdef IN_HISTORICAL_NETS
   #define IN_CLASSD(i)            IN_MULTICAST(i)
   #define IN_CLASSD_NET           0xf0000000      /* These ones aren't really */
   #define IN_CLASSD_NSHIFT        28              /* net and host fields, but */
   #define IN_CLASSD_HOST          0x0fffffff      /* routing needn't know.    */
   #endif /* IN_HISTORICAL_NETS */
   
   #define IN_EXPERIMENTAL(i)      (((in_addr_t)(i) & 0xf0000000) == 0xf0000000)
   #define IN_BADCLASS(i)          (((in_addr_t)(i) & 0xf0000000) == 0xf0000000)
   
   #define IN_LINKLOCAL(i)         (((in_addr_t)(i) & 0xffff0000) == 0xa9fe0000)
   #ifdef _KERNEL
   #define IN_LOOPBACK(i) \
       (((in_addr_t)(i) & V_in_loopback_mask) == 0x7f000000)
   #define IN_LOOPBACK_MASK_DFLT   0xff000000
   #else
   #define IN_LOOPBACK(i)          (((in_addr_t)(i) & 0xff000000) == 0x7f000000)
   #endif
   #define IN_ZERONET(i)           (((in_addr_t)(i) & 0xff000000) == 0)
   
   #define IN_PRIVATE(i)   ((((in_addr_t)(i) & 0xff000000) == 0x0a000000) || \
                            (((in_addr_t)(i) & 0xfff00000) == 0xac100000) || \
                            (((in_addr_t)(i) & 0xffff0000) == 0xc0a80000))
   
   #define IN_LOCAL_GROUP(i)       (((in_addr_t)(i) & 0xffffff00) == 0xe0000000)
   
   #define IN_ANY_LOCAL(i)         (IN_LINKLOCAL(i) || IN_LOCAL_GROUP(i))
   
   #define INADDR_LOOPBACK         ((in_addr_t)0x7f000001)
   #ifndef _KERNEL
   #define INADDR_NONE             ((in_addr_t)0xffffffff) /* -1 return */
   #endif
   
   #define INADDR_UNSPEC_GROUP     ((in_addr_t)0xe0000000) /* 224.0.0.0 */
   #define INADDR_ALLHOSTS_GROUP   ((in_addr_t)0xe0000001) /* 224.0.0.1 */
   #define INADDR_ALLRTRS_GROUP    ((in_addr_t)0xe0000002) /* 224.0.0.2 */
   #define INADDR_ALLRPTS_GROUP    ((in_addr_t)0xe0000016) /* 224.0.0.22, IGMPv3 */
   #define INADDR_CARP_GROUP       ((in_addr_t)0xe0000012) /* 224.0.0.18 */
   #define INADDR_PFSYNC_GROUP     ((in_addr_t)0xe00000f0) /* 224.0.0.240 */
   #define INADDR_ALLMDNS_GROUP    ((in_addr_t)0xe00000fb) /* 224.0.0.251 */
   #define INADDR_MAX_LOCAL_GROUP  ((in_addr_t)0xe00000ff) /* 224.0.0.255 */
   
   #ifdef IN_HISTORICAL_NETS
   #define IN_LOOPBACKNET          127                     /* official! */
   #endif /* IN_HISTORICAL_NETS */
   
   #define IN_RFC3021_MASK         ((in_addr_t)0xfffffffe)
   
   #ifdef _KERNEL
   #include <net/vnet.h>
   
   VNET_DECLARE(bool, ip_allow_net0);
   VNET_DECLARE(bool, ip_allow_net240);
   /* Address space reserved for loopback */
   VNET_DECLARE(uint32_t, in_loopback_mask);
   #define V_ip_allow_net0         VNET(ip_allow_net0)
   #define V_ip_allow_net240       VNET(ip_allow_net240)
   #define V_in_loopback_mask      VNET(in_loopback_mask)
   #endif
   
   /*
    * Options for use with [gs]etsockopt at the IP level.
    * First word of comment is data type; bool is stored in int.
    */
   #define IP_OPTIONS              1    /* buf/ip_opts; set/get IP options */
   #define IP_HDRINCL              2    /* int; header is included with data */
   #define IP_TOS                  3    /* int; IP type of service and preced. */
   #define IP_TTL                  4    /* int; IP time to live */
   #define IP_RECVOPTS             5    /* bool; receive all IP opts w/dgram */
   #define IP_RECVRETOPTS          6    /* bool; receive IP opts for response */
   #define IP_RECVDSTADDR          7    /* bool; receive IP dst addr w/dgram */
   #define IP_SENDSRCADDR          IP_RECVDSTADDR /* cmsg_type to set src addr */
   #define IP_RETOPTS              8    /* ip_opts; set/get IP options */
   #define IP_MULTICAST_IF         9    /* struct in_addr *or* struct ip_mreqn;
                                         * set/get IP multicast i/f  */
   #define IP_MULTICAST_TTL        10   /* u_char; set/get IP multicast ttl */
   #define IP_MULTICAST_LOOP       11   /* u_char; set/get IP multicast loopback */
   #define IP_ADD_MEMBERSHIP       12   /* ip_mreq; add an IP group membership */
   #define IP_DROP_MEMBERSHIP      13   /* ip_mreq; drop an IP group membership */
   #define IP_MULTICAST_VIF        14   /* set/get IP mcast virt. iface */
   #define IP_RSVP_ON              15   /* enable RSVP in kernel */
   #define IP_RSVP_OFF             16   /* disable RSVP in kernel */
   #define IP_RSVP_VIF_ON          17   /* set RSVP per-vif socket */
   #define IP_RSVP_VIF_OFF         18   /* unset RSVP per-vif socket */
   #define IP_PORTRANGE            19   /* int; range to choose for unspec port */
   #define IP_RECVIF               20   /* bool; receive reception if w/dgram */
   /* for IPSEC */
   #define IP_IPSEC_POLICY         21   /* int; set/get security policy */
                                        /* unused; was IP_FAITH */
   #define IP_ONESBCAST            23   /* bool: send all-ones broadcast */
   #define IP_BINDANY              24   /* bool: allow bind to any address */
   #define IP_BINDMULTI            25   /* bool: allow multiple listeners on a tuple */
   #define IP_RSS_LISTEN_BUCKET    26   /* int; set RSS listen bucket */
   #define IP_ORIGDSTADDR          27   /* bool: receive IP dst addr/port w/dgram */
   #define IP_RECVORIGDSTADDR      IP_ORIGDSTADDR
   
   /*
    * Options for controlling the firewall and dummynet.
    * Historical options (from 40 to 64) will eventually be
    * replaced by only two options, IP_FW3 and IP_DUMMYNET3.
    */
   #define IP_FW_TABLE_ADD         40   /* add entry */
   #define IP_FW_TABLE_DEL         41   /* delete entry */
   #define IP_FW_TABLE_FLUSH       42   /* flush table */
   #define IP_FW_TABLE_GETSIZE     43   /* get table size */
   #define IP_FW_TABLE_LIST        44   /* list table contents */
   
   #define IP_FW3                  48   /* generic ipfw v.3 sockopts */
   #define IP_DUMMYNET3            49   /* generic dummynet v.3 sockopts */
   
   #define IP_FW_ADD               50   /* add a firewall rule to chain */
   #define IP_FW_DEL               51   /* delete a firewall rule from chain */
   #define IP_FW_FLUSH             52   /* flush firewall rule chain */
   #define IP_FW_ZERO              53   /* clear single/all firewall counter(s) */
   #define IP_FW_GET               54   /* get entire firewall rule chain */
   #define IP_FW_RESETLOG          55   /* reset logging counters */
   
   #define IP_FW_NAT_CFG           56   /* add/config a nat rule */
   #define IP_FW_NAT_DEL           57   /* delete a nat rule */
   #define IP_FW_NAT_GET_CONFIG    58   /* get configuration of a nat rule */
   #define IP_FW_NAT_GET_LOG       59   /* get log of a nat rule */
   
   #define IP_DUMMYNET_CONFIGURE   60   /* add/configure a dummynet pipe */
   #define IP_DUMMYNET_DEL         61   /* delete a dummynet pipe from chain */
   #define IP_DUMMYNET_FLUSH       62   /* flush dummynet */
   #define IP_DUMMYNET_GET         64   /* get entire dummynet pipes */
   
   #define IP_RECVTTL              65   /* bool; receive IP TTL w/dgram */
   #define IP_MINTTL               66   /* minimum TTL for packet or drop */
   #define IP_DONTFRAG             67   /* don't fragment packet */
   #define IP_RECVTOS              68   /* bool; receive IP TOS w/dgram */
   
   /* IPv4 Source Filter Multicast API [RFC3678] */
   #define IP_ADD_SOURCE_MEMBERSHIP        70   /* join a source-specific group */
   #define IP_DROP_SOURCE_MEMBERSHIP       71   /* drop a single source */
   #define IP_BLOCK_SOURCE                 72   /* block a source */
   #define IP_UNBLOCK_SOURCE               73   /* unblock a source */
   
   /* The following option is private; do not use it from user applications. */
   #define IP_MSFILTER                     74   /* set/get filter list */
   
   /* The following option deals with the 802.1Q Ethernet Priority Code Point */
   #define IP_VLAN_PCP             75   /* int; set/get PCP used for packet, */
                                        /*      -1 use interface default */
   
   /* Protocol Independent Multicast API [RFC3678] */
   #define MCAST_JOIN_GROUP                80   /* join an any-source group */
   #define MCAST_LEAVE_GROUP               81   /* leave all sources for group */
   #define MCAST_JOIN_SOURCE_GROUP         82   /* join a source-specific group */
   #define MCAST_LEAVE_SOURCE_GROUP        83   /* leave a single source */
   #define MCAST_BLOCK_SOURCE              84   /* block a source */
   #define MCAST_UNBLOCK_SOURCE            85   /* unblock a source */
   
   /* Flow and RSS definitions */
   #define IP_FLOWID               90   /* get flow id for the given socket/inp */
   #define IP_FLOWTYPE             91   /* get flow type (M_HASHTYPE) */
   #define IP_RSSBUCKETID          92   /* get RSS flowid -> bucket mapping */
   #define IP_RECVFLOWID           93   /* bool; receive IP flowid/flowtype w/ datagram */
   #define IP_RECVRSSBUCKETID      94   /* bool; receive IP RSS bucket id w/ datagram */
   
   /*
    * Defaults and limits for options
    */
   #define IP_DEFAULT_MULTICAST_TTL  1     /* normally limit m'casts to 1 hop  */
   #define IP_DEFAULT_MULTICAST_LOOP 1     /* normally hear sends if a member  */
   
   /*
    * Limit for IPv4 multicast memberships
    */
   #define IP_MAX_MEMBERSHIPS      4095
   
   /*
    * Default resource limits for IPv4 multicast source filtering.
    * These may be modified by sysctl.
    */
   #define IP_MAX_GROUP_SRC_FILTER         512     /* sources per group */
   #define IP_MAX_SOCK_SRC_FILTER          128     /* sources per socket/group */
   #define IP_MAX_SOCK_MUTE_FILTER         128     /* XXX no longer used */
   
   /*
    * Argument structure for IP_ADD_MEMBERSHIP and IP_DROP_MEMBERSHIP.
    */
   struct ip_mreq {
           struct  in_addr imr_multiaddr;  /* IP multicast address of group */
           struct  in_addr imr_interface;  /* local IP address of interface */
   };
   
   /*
    * Modified argument structure for IP_MULTICAST_IF, obtained from Linux.
    * This is used to specify an interface index for multicast sends, as
    * the IPv4 legacy APIs do not support this (unless IP_SENDIF is available).
    */
   struct ip_mreqn {
           struct  in_addr imr_multiaddr;  /* IP multicast address of group */
           struct  in_addr imr_address;    /* local IP address of interface */
           int             imr_ifindex;    /* Interface index; cast to uint32_t */
   };
   
   /*
    * Argument structure for IPv4 Multicast Source Filter APIs. [RFC3678]
    */
   struct ip_mreq_source {
           struct  in_addr imr_multiaddr;  /* IP multicast address of group */
           struct  in_addr imr_sourceaddr; /* IP address of source */
           struct  in_addr imr_interface;  /* local IP address of interface */
   };
   
   /*
    * Argument structures for Protocol-Independent Multicast Source
    * Filter APIs. [RFC3678]
    */
   struct group_req {
           uint32_t                gr_interface;   /* interface index */
           struct sockaddr_storage gr_group;       /* group address */
   };
   
   struct group_source_req {
           uint32_t                gsr_interface;  /* interface index */
           struct sockaddr_storage gsr_group;      /* group address */
           struct sockaddr_storage gsr_source;     /* source address */
   };
   
   #ifndef __MSFILTERREQ_DEFINED
   #define __MSFILTERREQ_DEFINED
   /*
    * The following structure is private; do not use it from user applications.
    * It is used to communicate IP_MSFILTER/IPV6_MSFILTER information between
    * the RFC 3678 libc functions and the kernel.
    */
   struct __msfilterreq {
           uint32_t                 msfr_ifindex;  /* interface index */
           uint32_t                 msfr_fmode;    /* filter mode for group */
           uint32_t                 msfr_nsrcs;    /* # of sources in msfr_srcs */
           struct sockaddr_storage  msfr_group;    /* group address */
           struct sockaddr_storage *msfr_srcs;     /* pointer to the first member
                                                    * of a contiguous array of
                                                    * sources to filter in full.
                                                    */
   };
   #endif
   
   struct sockaddr;
   
   /*
    * Advanced (Full-state) APIs [RFC3678]
    * The RFC specifies uint_t for the 6th argument to [sg]etsourcefilter().
    * We use uint32_t here to be consistent.
    */
   int     setipv4sourcefilter(int, struct in_addr, struct in_addr, uint32_t,
               uint32_t, struct in_addr *);
   int     getipv4sourcefilter(int, struct in_addr, struct in_addr, uint32_t *,
               uint32_t *, struct in_addr *);
   int     setsourcefilter(int, uint32_t, struct sockaddr *, socklen_t,
               uint32_t, uint32_t, struct sockaddr_storage *);
   int     getsourcefilter(int, uint32_t, struct sockaddr *, socklen_t,
               uint32_t *, uint32_t *, struct sockaddr_storage *);
   
   /*
    * Filter modes; also used to represent per-socket filter mode internally.
    */
   #define MCAST_UNDEFINED 0       /* fmode: not yet defined */
   #define MCAST_INCLUDE   1       /* fmode: include these source(s) */
   #define MCAST_EXCLUDE   2       /* fmode: exclude these source(s) */
   
   /*
    * Argument for IP_PORTRANGE:
    * - which range to search when port is unspecified at bind() or connect()
    */
   #define IP_PORTRANGE_DEFAULT    0       /* default range */
   #define IP_PORTRANGE_HIGH       1       /* "high" - request firewall bypass */
   #define IP_PORTRANGE_LOW        2       /* "low" - vouchsafe security */
   
   /*
    * Identifiers for IP sysctl nodes
    */
   #define IPCTL_FORWARDING        1       /* act as router */
   #define IPCTL_SENDREDIRECTS     2       /* may send redirects when forwarding */
   #define IPCTL_DEFTTL            3       /* default TTL */
   #ifdef notyet
   #define IPCTL_DEFMTU            4       /* default MTU */
   #endif
   /*      IPCTL_RTEXPIRE          5       deprecated */
   /*      IPCTL_RTMINEXPIRE       6       deprecated */
   /*      IPCTL_RTMAXCACHE        7       deprecated */
   #define IPCTL_SOURCEROUTE       8       /* may perform source routes */
   #define IPCTL_DIRECTEDBROADCAST 9       /* may re-broadcast received packets */
   #define IPCTL_INTRQMAXLEN       10      /* max length of netisr queue */
   #define IPCTL_INTRQDROPS        11      /* number of netisr q drops */
   #define IPCTL_STATS             12      /* ipstat structure */
   #define IPCTL_ACCEPTSOURCEROUTE 13      /* may accept source routed packets */
   #define IPCTL_FASTFORWARDING    14      /* use fast IP forwarding code */
                                           /* 15, unused, was: IPCTL_KEEPFAITH  */
   #define IPCTL_GIF_TTL           16      /* default TTL for gif encap packet */
   #define IPCTL_INTRDQMAXLEN      17      /* max length of direct netisr queue */
   #define IPCTL_INTRDQDROPS       18      /* number of direct netisr q drops */
   
   #endif /* __BSD_VISIBLE */
   
   #ifdef _KERNEL
   
   struct ifnet; struct mbuf;      /* forward declarations for Standard C */
   struct in_ifaddr;
   
   int      in_broadcast(struct in_addr, struct ifnet *);
   int      in_ifaddr_broadcast(struct in_addr, struct in_ifaddr *);
   int      in_canforward(struct in_addr);
   int      in_localaddr(struct in_addr);
   bool     in_localip(struct in_addr);
   bool     in_localip_fib(struct in_addr, uint16_t);
   int      in_ifhasaddr(struct ifnet *, struct in_addr);
   struct in_ifaddr *in_findlocal(uint32_t, bool);
   int      inet_aton(const char *, struct in_addr *); /* in libkern */
   char    *inet_ntoa_r(struct in_addr ina, char *buf); /* in libkern */
   char    *inet_ntop(int, const void *, char *, socklen_t); /* in libkern */
   int      inet_pton(int af, const char *, void *); /* in libkern */
   void     in_ifdetach(struct ifnet *);
   
   #define in_hosteq(s, t) ((s).s_addr == (t).s_addr)
   #define in_nullhost(x)  ((x).s_addr == INADDR_ANY)
   #define in_allhosts(x)  ((x).s_addr == htonl(INADDR_ALLHOSTS_GROUP))
   
   #define satosin(sa)     ((struct sockaddr_in *)(sa))
   #define sintosa(sin)    ((struct sockaddr *)(sin))
   #define ifatoia(ifa)    ((struct in_ifaddr *)(ifa))
   #endif /* _KERNEL */
   
   /* INET6 stuff */
   #if __POSIX_VISIBLE >= 200112
   #define __KAME_NETINET_IN_H_INCLUDED_
   #include <netinet6/in6.h>
   #undef __KAME_NETINET_IN_H_INCLUDED_
   #endif
   
   #endif /* !_NETINET_IN_H_*/

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