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

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    1 /*
    2  * Copyright (c) 1982, 1986, 1990, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)in.h        8.3 (Berkeley) 1/3/94
   34  * $FreeBSD$
   35  */
   36 
   37 #ifndef _NETINET_IN_H_
   38 #define _NETINET_IN_H_
   39 
   40 /*
   41  * Constants and structures defined by the internet system,
   42  * Per RFC 790, September 1981, and numerous additions.
   43  */
   44 
   45 /*
   46  * Protocols (RFC 1700)
   47  */
   48 #define IPPROTO_IP              0               /* dummy for IP */
   49 #define IPPROTO_ICMP            1               /* control message protocol */
   50 #define IPPROTO_IGMP            2               /* group mgmt protocol */
   51 #define IPPROTO_GGP             3               /* gateway^2 (deprecated) */
   52 #define IPPROTO_IPIP            4               /* IP encapsulation in IP */
   53 #define IPPROTO_TCP             6               /* tcp */
   54 #define IPPROTO_ST              7               /* Stream protocol II */
   55 #define IPPROTO_EGP             8               /* exterior gateway protocol */
   56 #define IPPROTO_PIGP            9               /* private interior gateway */
   57 #define IPPROTO_RCCMON          10              /* BBN RCC Monitoring */
   58 #define IPPROTO_NVPII           11              /* network voice protocol*/
   59 #define IPPROTO_PUP             12              /* pup */
   60 #define IPPROTO_ARGUS           13              /* Argus */
   61 #define IPPROTO_EMCON           14              /* EMCON */
   62 #define IPPROTO_XNET            15              /* Cross Net Debugger */
   63 #define IPPROTO_CHAOS           16              /* Chaos*/
   64 #define IPPROTO_UDP             17              /* user datagram protocol */
   65 #define IPPROTO_MUX             18              /* Multiplexing */
   66 #define IPPROTO_MEAS            19              /* DCN Measurement Subsystems */
   67 #define IPPROTO_HMP             20              /* Host Monitoring */
   68 #define IPPROTO_PRM             21              /* Packet Radio Measurement */
   69 #define IPPROTO_IDP             22              /* xns idp */
   70 #define IPPROTO_TRUNK1          23              /* Trunk-1 */
   71 #define IPPROTO_TRUNK2          24              /* Trunk-2 */
   72 #define IPPROTO_LEAF1           25              /* Leaf-1 */
   73 #define IPPROTO_LEAF2           26              /* Leaf-2 */
   74 #define IPPROTO_RDP             27              /* Reliable Data */
   75 #define IPPROTO_IRTP            28              /* Reliable Transaction */
   76 #define IPPROTO_TP              29              /* tp-4 w/ class negotiation */
   77 #define IPPROTO_BLT             30              /* Bulk Data Transfer */
   78 #define IPPROTO_NSP             31              /* Network Services */
   79 #define IPPROTO_INP             32              /* Merit Internodal */
   80 #define IPPROTO_SEP             33              /* Sequential Exchange */
   81 #define IPPROTO_3PC             34              /* Third Party Connect */
   82 #define IPPROTO_IDPR            35              /* InterDomain Policy Routing */
   83 #define IPPROTO_XTP             36              /* XTP */
   84 #define IPPROTO_DDP             37              /* Datagram Delivery */
   85 #define IPPROTO_CMTP            38              /* Control Message Transport */
   86 #define IPPROTO_TPXX            39              /* TP++ Transport */
   87 #define IPPROTO_IL              40              /* IL transport protocol */
   88 #define IPPROTO_SIP             41              /* Simple Internet Protocol */
   89 #define IPPROTO_SDRP            42              /* Source Demand Routing */
   90 #define IPPROTO_SIPSR           43              /* SIP Source Route */
   91 #define IPPROTO_SIPFRAG         44              /* SIP Fragment */
   92 #define IPPROTO_IDRP            45              /* InterDomain Routing*/
   93 #define IPPROTO_RSVP            46              /* resource reservation */
   94 #define IPPROTO_GRE             47              /* General Routing Encap. */
   95 #define IPPROTO_MHRP            48              /* Mobile Host Routing */
   96 #define IPPROTO_BHA             49              /* BHA */
   97 #define IPPROTO_ESP             50              /* SIPP Encap Sec. Payload */
   98 #define IPPROTO_AH              51              /* SIPP Auth Header */
   99 #define IPPROTO_INLSP           52              /* Integ. Net Layer Security */
  100 #define IPPROTO_SWIPE           53              /* IP with encryption */
  101 #define IPPROTO_NHRP            54              /* Next Hop Resolution */
  102 /* 55-60: Unassigned */
  103 #define IPPROTO_AHIP            61              /* any host internal protocol */
  104 #define IPPROTO_CFTP            62              /* CFTP */
  105 #define IPPROTO_HELLO           63              /* "hello" routing protocol */
  106 #define IPPROTO_SATEXPAK        64              /* SATNET/Backroom EXPAK */
  107 #define IPPROTO_KRYPTOLAN       65              /* Kryptolan */
  108 #define IPPROTO_RVD             66              /* Remote Virtual Disk */
  109 #define IPPROTO_IPPC            67              /* Pluribus Packet Core */
  110 #define IPPROTO_ADFS            68              /* Any distributed FS */
  111 #define IPPROTO_SATMON          69              /* Satnet Monitoring */
  112 #define IPPROTO_VISA            70              /* VISA Protocol */
  113 #define IPPROTO_IPCV            71              /* Packet Core Utility */
  114 #define IPPROTO_CPNX            72              /* Comp. Prot. Net. Executive */
  115 #define IPPROTO_CPHB            73              /* Comp. Prot. HeartBeat */
  116 #define IPPROTO_WSN             74              /* Wang Span Network */
  117 #define IPPROTO_PVP             75              /* Packet Video Protocol */
  118 #define IPPROTO_BRSATMON        76              /* BackRoom SATNET Monitoring */
  119 #define IPPROTO_ND              77              /* Sun net disk proto (temp.) */
  120 #define IPPROTO_WBMON           78              /* WIDEBAND Monitoring */
  121 #define IPPROTO_WBEXPAK         79              /* WIDEBAND EXPAK */
  122 #define IPPROTO_EON             80              /* ISO cnlp */
  123 #define IPPROTO_VMTP            81              /* VMTP */
  124 #define IPPROTO_SVMTP           82              /* Secure VMTP */
  125 #define IPPROTO_VINES           83              /* Banyon VINES */
  126 #define IPPROTO_TTP             84              /* TTP */
  127 #define IPPROTO_IGP             85              /* NSFNET-IGP */
  128 #define IPPROTO_DGP             86              /* dissimilar gateway prot. */
  129 #define IPPROTO_TCF             87              /* TCF */
  130 #define IPPROTO_IGRP            88              /* Cisco/GXS IGRP */
  131 #define IPPROTO_OSPFIGP         89              /* OSPFIGP */
  132 #define IPPROTO_SRPC            90              /* Strite RPC protocol */
  133 #define IPPROTO_LARP            91              /* Locus Address Resoloution */
  134 #define IPPROTO_MTP             92              /* Multicast Transport */
  135 #define IPPROTO_AX25            93              /* AX.25 Frames */
  136 #define IPPROTO_IPEIP           94              /* IP encapsulated in IP */
  137 #define IPPROTO_MICP            95              /* Mobile Int.ing control */
  138 #define IPPROTO_SCCSP           96              /* Semaphore Comm. security */
  139 #define IPPROTO_ETHERIP         97              /* Ethernet IP encapsulation */
  140 #define IPPROTO_ENCAP           98              /* encapsulation header */
  141 #define IPPROTO_APES            99              /* any private encr. scheme */
  142 #define IPPROTO_GMTP            100             /* GMTP*/
  143 /* 101-254: Partly Unassigned */
  144 #define IPPROTO_PGM             113             /* PGM */
  145 /* 255: Reserved */
  146 /* BSD Private, local use, namespace incursion */
  147 #define IPPROTO_DIVERT          254             /* divert pseudo-protocol */
  148 #define IPPROTO_RAW             255             /* raw IP packet */
  149 #define IPPROTO_MAX             256
  150 
  151 
  152 /*
  153  * Local port number conventions:
  154  *
  155  * When a user does a bind(2) or connect(2) with a port number of zero,
  156  * a non-conflicting local port address is chosen.
  157  * The default range is IPPORT_RESERVED through
  158  * IPPORT_USERRESERVED, although that is settable by sysctl.
  159  *
  160  * A user may set the IPPROTO_IP option IP_PORTRANGE to change this
  161  * default assignment range.
  162  *
  163  * The value IP_PORTRANGE_DEFAULT causes the default behavior.
  164  *
  165  * The value IP_PORTRANGE_HIGH changes the range of candidate port numbers
  166  * into the "high" range.  These are reserved for client outbound connections
  167  * which do not want to be filtered by any firewalls.
  168  *
  169  * The value IP_PORTRANGE_LOW changes the range to the "low" are
  170  * that is (by convention) restricted to privileged processes.  This
  171  * convention is based on "vouchsafe" principles only.  It is only secure
  172  * if you trust the remote host to restrict these ports.
  173  *
  174  * The default range of ports and the high range can be changed by
  175  * sysctl(3).  (net.inet.ip.port{hi,low}{first,last}_auto)
  176  *
  177  * Changing those values has bad security implications if you are
  178  * using a a stateless firewall that is allowing packets outside of that
  179  * range in order to allow transparent outgoing connections.
  180  *
  181  * Such a firewall configuration will generally depend on the use of these
  182  * default values.  If you change them, you may find your Security
  183  * Administrator looking for you with a heavy object.
  184  *
  185  * For a slightly more orthodox text view on this:
  186  *
  187  *            ftp://ftp.isi.edu/in-notes/iana/assignments/port-numbers
  188  *
  189  *    port numbers are divided into three ranges:
  190  *
  191  *                0 -  1023 Well Known Ports
  192  *             1024 - 49151 Registered Ports
  193  *            49152 - 65535 Dynamic and/or Private Ports
  194  *
  195  */
  196 
  197 /*
  198  * Ports < IPPORT_RESERVED are reserved for
  199  * privileged processes (e.g. root).         (IP_PORTRANGE_LOW)
  200  * Ports > IPPORT_USERRESERVED are reserved
  201  * for servers, not necessarily privileged.  (IP_PORTRANGE_DEFAULT)
  202  */
  203 #define IPPORT_RESERVED         1024
  204 #define IPPORT_USERRESERVED     5000
  205 
  206 /*
  207  * Default local port range to use by setting IP_PORTRANGE_HIGH
  208  */
  209 #define IPPORT_HIFIRSTAUTO      49152
  210 #define IPPORT_HILASTAUTO       65535
  211 
  212 /*
  213  * Scanning for a free reserved port return a value below IPPORT_RESERVED,
  214  * but higher than IPPORT_RESERVEDSTART.  Traditionally the start value was
  215  * 512, but that conflicts with some well-known-services that firewalls may
  216  * have a fit if we use.
  217  */
  218 #define IPPORT_RESERVEDSTART    600
  219 
  220 /*
  221  * Internet address (a structure for historical reasons)
  222  */
  223 struct in_addr {
  224         u_int32_t s_addr;
  225 };
  226 
  227 /*
  228  * Definitions of bits in internet address integers.
  229  * On subnets, the decomposition of addresses to host and net parts
  230  * is done according to subnet mask, not the masks here.
  231  */
  232 #define IN_CLASSA(i)            (((u_int32_t)(i) & 0x80000000) == 0)
  233 #define IN_CLASSA_NET           0xff000000
  234 #define IN_CLASSA_NSHIFT        24
  235 #define IN_CLASSA_HOST          0x00ffffff
  236 #define IN_CLASSA_MAX           128
  237 
  238 #define IN_CLASSB(i)            (((u_int32_t)(i) & 0xc0000000) == 0x80000000)
  239 #define IN_CLASSB_NET           0xffff0000
  240 #define IN_CLASSB_NSHIFT        16
  241 #define IN_CLASSB_HOST          0x0000ffff
  242 #define IN_CLASSB_MAX           65536
  243 
  244 #define IN_CLASSC(i)            (((u_int32_t)(i) & 0xe0000000) == 0xc0000000)
  245 #define IN_CLASSC_NET           0xffffff00
  246 #define IN_CLASSC_NSHIFT        8
  247 #define IN_CLASSC_HOST          0x000000ff
  248 
  249 #define IN_CLASSD(i)            (((u_int32_t)(i) & 0xf0000000) == 0xe0000000)
  250 #define IN_CLASSD_NET           0xf0000000      /* These ones aren't really */
  251 #define IN_CLASSD_NSHIFT        28              /* net and host fields, but */
  252 #define IN_CLASSD_HOST          0x0fffffff      /* routing needn't know.    */
  253 #define IN_MULTICAST(i)         IN_CLASSD(i)
  254 
  255 #define IN_EXPERIMENTAL(i)      (((u_int32_t)(i) & 0xf0000000) == 0xf0000000)
  256 #define IN_BADCLASS(i)          (((u_int32_t)(i) & 0xf0000000) == 0xf0000000)
  257 
  258 #define INADDR_ANY              (u_int32_t)0x00000000
  259 #define INADDR_LOOPBACK         (u_int32_t)0x7f000001
  260 #define INADDR_BROADCAST        (u_int32_t)0xffffffff   /* must be masked */
  261 #ifndef KERNEL
  262 #define INADDR_NONE             0xffffffff              /* -1 return */
  263 #endif
  264 
  265 #define INADDR_UNSPEC_GROUP     (u_int32_t)0xe0000000   /* 224.0.0.0 */
  266 #define INADDR_ALLHOSTS_GROUP   (u_int32_t)0xe0000001   /* 224.0.0.1 */
  267 #define INADDR_ALLRTRS_GROUP    (u_int32_t)0xe0000002   /* 224.0.0.2 */
  268 #define INADDR_MAX_LOCAL_GROUP  (u_int32_t)0xe00000ff   /* 224.0.0.255 */
  269 
  270 #define IN_LOOPBACKNET          127                     /* official! */
  271 
  272 /*
  273  * Socket address, internet style.
  274  */
  275 struct sockaddr_in {
  276         u_char  sin_len;
  277         u_char  sin_family;
  278         u_short sin_port;
  279         struct  in_addr sin_addr;
  280         char    sin_zero[8];
  281 };
  282 
  283 /*
  284  * Structure used to describe IP options.
  285  * Used to store options internally, to pass them to a process,
  286  * or to restore options retrieved earlier.
  287  * The ip_dst is used for the first-hop gateway when using a source route
  288  * (this gets put into the header proper).
  289  */
  290 struct ip_opts {
  291         struct  in_addr ip_dst;         /* first hop, 0 w/o src rt */
  292         char    ip_opts[40];            /* actually variable in size */
  293 };
  294 
  295 /*
  296  * Options for use with [gs]etsockopt at the IP level.
  297  * First word of comment is data type; bool is stored in int.
  298  */
  299 #define IP_OPTIONS              1    /* buf/ip_opts; set/get IP options */
  300 #define IP_HDRINCL              2    /* int; header is included with data */
  301 #define IP_TOS                  3    /* int; IP type of service and preced. */
  302 #define IP_TTL                  4    /* int; IP time to live */
  303 #define IP_RECVOPTS             5    /* bool; receive all IP opts w/dgram */
  304 #define IP_RECVRETOPTS          6    /* bool; receive IP opts for response */
  305 #define IP_RECVDSTADDR          7    /* bool; receive IP dst addr w/dgram */
  306 #define IP_RETOPTS              8    /* ip_opts; set/get IP options */
  307 #define IP_MULTICAST_IF         9    /* u_char; set/get IP multicast i/f  */
  308 #define IP_MULTICAST_TTL        10   /* u_char; set/get IP multicast ttl */
  309 #define IP_MULTICAST_LOOP       11   /* u_char; set/get IP multicast loopback */
  310 #define IP_ADD_MEMBERSHIP       12   /* ip_mreq; add an IP group membership */
  311 #define IP_DROP_MEMBERSHIP      13   /* ip_mreq; drop an IP group membership */
  312 #define IP_MULTICAST_VIF        14   /* set/get IP mcast virt. iface */
  313 #define IP_RSVP_ON              15   /* enable RSVP in kernel */
  314 #define IP_RSVP_OFF             16   /* disable RSVP in kernel */
  315 #define IP_RSVP_VIF_ON          17   /* set RSVP per-vif socket */
  316 #define IP_RSVP_VIF_OFF         18   /* unset RSVP per-vif socket */
  317 #define IP_PORTRANGE            19   /* int; range to choose for unspec port */
  318 #define IP_RECVIF               20   /* bool; receive reception if w/dgram */
  319 
  320 #define IP_FW_ADD               50   /* add a firewall rule to chain */
  321 #define IP_FW_DEL               51   /* delete a firewall rule from chain */
  322 #define IP_FW_FLUSH             52   /* flush firewall rule chain */
  323 #define IP_FW_ZERO              53   /* clear single/all firewall counter(s) */
  324 #define IP_FW_GET               54   /* get entire firewall rule chain */
  325 #define IP_NAT                  55   /* set/get NAT opts */
  326 #define IP_FW_RESETLOG          56   /* reset logging counters */
  327 
  328 #define IP_DUMMYNET_CONFIGURE   60   /* add/configure a dummynet pipe */
  329 #define IP_DUMMYNET_DEL         61   /* delete a dummynet pipe from chain */
  330 #define IP_DUMMYNET_FLUSH       62   /* flush dummynet */
  331 #define IP_DUMMYNET_GET         64   /* get entire dummynet pipes */
  332 
  333 /*
  334  * Defaults and limits for options
  335  */
  336 #define IP_DEFAULT_MULTICAST_TTL  1     /* normally limit m'casts to 1 hop  */
  337 #define IP_DEFAULT_MULTICAST_LOOP 1     /* normally hear sends if a member  */
  338 #define IP_MAX_MEMBERSHIPS      20      /* per socket */
  339 
  340 /*
  341  * Argument structure for IP_ADD_MEMBERSHIP and IP_DROP_MEMBERSHIP.
  342  */
  343 struct ip_mreq {
  344         struct  in_addr imr_multiaddr;  /* IP multicast address of group */
  345         struct  in_addr imr_interface;  /* local IP address of interface */
  346 };
  347 
  348 /*
  349  * Argument for IP_PORTRANGE:
  350  * - which range to search when port is unspecified at bind() or connect()
  351  */
  352 #define IP_PORTRANGE_DEFAULT    0       /* default range */
  353 #define IP_PORTRANGE_HIGH       1       /* "high" - request firewall bypass */
  354 #define IP_PORTRANGE_LOW        2       /* "low" - vouchsafe security */
  355 
  356 /*
  357  * Definitions for inet sysctl operations.
  358  *
  359  * Third level is protocol number.
  360  * Fourth level is desired variable within that protocol.
  361  */
  362 #define IPPROTO_MAXID   (IPPROTO_IDP + 1)       /* don't list to IPPROTO_MAX */
  363 
  364 #define CTL_IPPROTO_NAMES { \
  365         { "ip", CTLTYPE_NODE }, \
  366         { "icmp", CTLTYPE_NODE }, \
  367         { "igmp", CTLTYPE_NODE }, \
  368         { "ggp", CTLTYPE_NODE }, \
  369         { 0, 0 }, \
  370         { 0, 0 }, \
  371         { "tcp", CTLTYPE_NODE }, \
  372         { 0, 0 }, \
  373         { "egp", CTLTYPE_NODE }, \
  374         { 0, 0 }, \
  375         { 0, 0 }, \
  376         { 0, 0 }, \
  377         { "pup", CTLTYPE_NODE }, \
  378         { 0, 0 }, \
  379         { 0, 0 }, \
  380         { 0, 0 }, \
  381         { 0, 0 }, \
  382         { "udp", CTLTYPE_NODE }, \
  383         { 0, 0 }, \
  384         { 0, 0 }, \
  385         { 0, 0 }, \
  386         { 0, 0 }, \
  387         { "idp", CTLTYPE_NODE }, \
  388 }
  389 
  390 /*
  391  * Names for IP sysctl objects
  392  */
  393 #define IPCTL_FORWARDING        1       /* act as router */
  394 #define IPCTL_SENDREDIRECTS     2       /* may send redirects when forwarding */
  395 #define IPCTL_DEFTTL            3       /* default TTL */
  396 #ifdef notyet
  397 #define IPCTL_DEFMTU            4       /* default MTU */
  398 #endif
  399 #define IPCTL_RTEXPIRE          5       /* cloned route expiration time */
  400 #define IPCTL_RTMINEXPIRE       6       /* min value for expiration time */
  401 #define IPCTL_RTMAXCACHE        7       /* trigger level for dynamic expire */
  402 #define IPCTL_SOURCEROUTE       8       /* may perform source routes */
  403 #define IPCTL_DIRECTEDBROADCAST 9       /* may re-broadcast received packets */
  404 #define IPCTL_INTRQMAXLEN       10      /* max length of netisr queue */
  405 #define IPCTL_INTRQDROPS        11      /* number of netisr q drops */
  406 #define IPCTL_STATS             12      /* ipstat structure */
  407 #define IPCTL_ACCEPTSOURCEROUTE 13      /* may accept source routed packets */
  408 #define IPCTL_FASTFORWARDING    14      /* use fast IP forwarding code */
  409 #define IPCTL_MAXID             15
  410 
  411 #define IPCTL_NAMES { \
  412         { 0, 0 }, \
  413         { "forwarding", CTLTYPE_INT }, \
  414         { "redirect", CTLTYPE_INT }, \
  415         { "ttl", CTLTYPE_INT }, \
  416         { "mtu", CTLTYPE_INT }, \
  417         { "rtexpire", CTLTYPE_INT }, \
  418         { "rtminexpire", CTLTYPE_INT }, \
  419         { "rtmaxcache", CTLTYPE_INT }, \
  420         { "sourceroute", CTLTYPE_INT }, \
  421         { "directed-broadcast", CTLTYPE_INT }, \
  422         { "intr-queue-maxlen", CTLTYPE_INT }, \
  423         { "intr-queue-drops", CTLTYPE_INT }, \
  424         { "stats", CTLTYPE_STRUCT }, \
  425         { "accept_sourceroute", CTLTYPE_INT }, \
  426         { "fastforwarding", CTLTYPE_INT }, \
  427 }
  428 
  429 
  430 #ifdef KERNEL
  431 struct ifnet; struct mbuf;      /* forward declarations for Standard C */
  432 
  433 int      in_broadcast __P((struct in_addr, struct ifnet *));
  434 int      in_canforward __P((struct in_addr));
  435 int      in_cksum __P((struct mbuf *, int));
  436 int      in_localaddr __P((struct in_addr));
  437 char    *inet_ntoa __P((struct in_addr)); /* in libkern */
  438 
  439 #endif /* KERNEL */
  440 
  441 #endif

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