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

     /*
      * 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. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. 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_
    
    /*
     * Constants and structures defined by the internet system,
     * Per RFC 790, September 1981, and numerous additions.
     */
    
    /*
     * Protocols (RFC 1700)
     */
    #define IPPROTO_IP              0               /* dummy for IP */
    #define IPPROTO_HOPOPTS         0               /* IP6 hop-by-hop options */
    #define IPPROTO_ICMP            1               /* control message protocol */
    #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_TCP             6               /* tcp */
    #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_UDP             17              /* user datagram protocol */
    #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_SEP             33              /* Sequential Exchange */
    #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_IPV6            41              /* IP6 header */
    #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) */
   /* 101-254: Partly Unassigned */
   #define IPPROTO_PIM             103             /* Protocol Independent Mcast */
   #define IPPROTO_PGM             113             /* PGM */
   /* 255: Reserved */
   /* BSD Private, local use, namespace incursion */
   #define IPPROTO_DIVERT          254             /* divert pseudo-protocol */
   #define IPPROTO_RAW             255             /* raw IP packet */
   #define IPPROTO_MAX             256
   
   /* last return value of *_input(), meaning "all job for this pkt is done".  */
   #define IPPROTO_DONE            257
   
   /*
    * 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_RESERVED through
    * IPPORT_USERRESERVED, 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.port{hi,low}{first,last}_auto)
    *
    * Changing those values has bad security implications if you are
    * using a 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)
    * Ports > IPPORT_USERRESERVED are reserved
    * for servers, not necessarily privileged.  (IP_PORTRANGE_DEFAULT)
    */
   #define IPPORT_RESERVED         1024
   #define IPPORT_USERRESERVED     5000
   
   /*
    * Default local port range to use by setting 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
   
   /*
    * Internet address (a structure for historical reasons)
    */
   struct in_addr {
           in_addr_t s_addr;
   };
   
   /*
    * Definitions of bits in internet address integers.
    * On subnets, the decomposition of addresses to host and net parts
    * is done according to subnet mask, not the masks here.
    */
   #define IN_CLASSA(i)            (((u_int32_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)            (((u_int32_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)            (((u_int32_t)(i) & 0xe0000000) == 0xc0000000)
   #define IN_CLASSC_NET           0xffffff00
   #define IN_CLASSC_NSHIFT        8
   #define IN_CLASSC_HOST          0x000000ff
   
   #define IN_CLASSD(i)            (((u_int32_t)(i) & 0xf0000000) == 0xe0000000)
   #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.    */
   #define IN_MULTICAST(i)         IN_CLASSD(i)
   
   #define IN_EXPERIMENTAL(i)      (((u_int32_t)(i) & 0xf0000000) == 0xf0000000)
   #define IN_BADCLASS(i)          (((u_int32_t)(i) & 0xf0000000) == 0xf0000000)
   
   #define INADDR_ANY              (u_int32_t)0x00000000
   #define INADDR_LOOPBACK         (u_int32_t)0x7f000001
   #define INADDR_BROADCAST        (u_int32_t)0xffffffff   /* must be masked */
   #ifndef _KERNEL
   #define INADDR_NONE             0xffffffff              /* -1 return */
   #endif
   
   #define INADDR_UNSPEC_GROUP     (u_int32_t)0xe0000000   /* 224.0.0.0 */
   #define INADDR_ALLHOSTS_GROUP   (u_int32_t)0xe0000001   /* 224.0.0.1 */
   #define INADDR_ALLRTRS_GROUP    (u_int32_t)0xe0000002   /* 224.0.0.2 */
   #define INADDR_MAX_LOCAL_GROUP  (u_int32_t)0xe00000ff   /* 224.0.0.255 */
   
   #define IN_LOOPBACKNET          127                     /* official! */
   
   /*
    * Socket address, internet style.
    */
   struct sockaddr_in {
           u_char  sin_len;
           u_char  sin_family;
           u_short sin_port;
           struct  in_addr sin_addr;
           char    sin_zero[8];
   };
   
   #define INET_ADDRSTRLEN                 16
   
   /*
    * 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_RETOPTS              8    /* ip_opts; set/get IP options */
   #define IP_MULTICAST_IF         9    /* u_char; 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 */
   #define IP_FAITH                22   /* bool; accept FAITH'ed connections */
   
   #define IP_ONESBCAST            23   /* bool: send all-ones broadcast */
   
   #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_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_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 */
   
   /*
    * 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  */
   #define IP_MAX_MEMBERSHIPS      20      /* per socket */
   
   /*
    * 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 */
   };
   
   /*
    * 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 */
   
   /*
    * Definitions for inet sysctl operations.
    *
    * Third level is protocol number.
    * Fourth level is desired variable within that protocol.
    */
   #define IPPROTO_MAXID   (IPPROTO_AH + 1)        /* don't list to IPPROTO_MAX */
   
   #define CTL_IPPROTO_NAMES { \
           { "ip", CTLTYPE_NODE }, \
           { "icmp", CTLTYPE_NODE }, \
           { "igmp", CTLTYPE_NODE }, \
           { "ggp", CTLTYPE_NODE }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { "tcp", CTLTYPE_NODE }, \
           { 0, 0 }, \
           { "egp", CTLTYPE_NODE }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { "pup", CTLTYPE_NODE }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { "udp", CTLTYPE_NODE }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { "idp", CTLTYPE_NODE }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { "ipsec", CTLTYPE_NODE }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
           { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
           { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
           { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
           { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
           { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
           { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
           { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
           { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { "pim", CTLTYPE_NODE }, \
   }
   
   /*
    * Names for IP sysctl objects
    */
   #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
   #define IPCTL_RTEXPIRE          5       /* cloned route expiration time */
   #define IPCTL_RTMINEXPIRE       6       /* min value for expiration time */
   #define IPCTL_RTMAXCACHE        7       /* trigger level for dynamic expire */
   #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 */
   #define IPCTL_KEEPFAITH         15      /* FAITH IPv4->IPv6 translater ctl */
   #define IPCTL_GIF_TTL           16      /* default TTL for gif encap packet */
   #define IPCTL_MAXID             17
   
   #define IPCTL_NAMES { \
           { 0, 0 }, \
           { "forwarding", CTLTYPE_INT }, \
           { "redirect", CTLTYPE_INT }, \
           { "ttl", CTLTYPE_INT }, \
           { "mtu", CTLTYPE_INT }, \
           { "rtexpire", CTLTYPE_INT }, \
           { "rtminexpire", CTLTYPE_INT }, \
           { "rtmaxcache", CTLTYPE_INT }, \
           { "sourceroute", CTLTYPE_INT }, \
           { "directed-broadcast", CTLTYPE_INT }, \
           { "intr-queue-maxlen", CTLTYPE_INT }, \
           { "intr-queue-drops", CTLTYPE_INT }, \
           { "stats", CTLTYPE_STRUCT }, \
           { "accept_sourceroute", CTLTYPE_INT }, \
           { "fastforwarding", CTLTYPE_INT }, \
   }
   
   #ifdef _KERNEL
   struct ifnet; struct mbuf;      /* forward declarations for Standard C */
   #endif
   
   /* INET6 stuff */
   #define __KAME_NETINET_IN_H_INCLUDED_
   #include <netinet6/in6.h>
   #undef __KAME_NETINET_IN_H_INCLUDED_
   
   #ifdef _KERNEL
   
   int      in_broadcast __P((struct in_addr, struct ifnet *));
   int      in_canforward __P((struct in_addr));
   int      in_cksum __P((struct mbuf *, int));
   int      in_localaddr __P((struct in_addr));
   char    *inet_ntoa __P((struct in_addr)); /* in libkern */
   
   int     prison_ip __P((struct proc *p, int flag, u_int32_t *ip));
   void    prison_remote_ip __P((struct proc *p, int flag, u_int32_t *ip));
   
   #define in_hosteq(s, t) ((s).s_addr == (t).s_addr)
   #define in_nullhost(x)  ((x).s_addr == INADDR_ANY)
   
   #define satosin(sa)     ((struct sockaddr_in *)(sa))
   #define sintosa(sin)    ((struct sockaddr *)(sin))
   #define ifatoia(ifa)    ((struct in_ifaddr *)(ifa))
   
   #endif
   
   #endif

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