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 /*      $NetBSD: in.h,v 1.64.2.1 2004/05/10 15:00:59 tron Exp $ */
    2 
    3 /*
    4  * Copyright (c) 1982, 1986, 1990, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)in.h        8.3 (Berkeley) 1/3/94
   32  */
   33 
   34 /*
   35  * Constants and structures defined by the internet system,
   36  * Per RFC 790, September 1981, and numerous additions.
   37  */
   38 
   39 #ifndef _NETINET_IN_H_
   40 #define _NETINET_IN_H_
   41 
   42 #include <machine/int_types.h>
   43 
   44 #ifndef uint8_t
   45 typedef __uint8_t       uint8_t;
   46 #define uint8_t         __uint8_t
   47 #endif
   48 
   49 #ifndef uint32_t
   50 typedef __uint32_t      uint32_t;
   51 #define uint32_t        __uint32_t
   52 #endif
   53 
   54 #include <sys/ansi.h>
   55 
   56 #ifndef in_addr_t
   57 typedef __in_addr_t     in_addr_t;
   58 #define in_addr_t       __in_addr_t
   59 #endif
   60 
   61 #ifndef in_port_t
   62 typedef __in_port_t     in_port_t;
   63 #define in_port_t       __in_port_t
   64 #endif
   65 
   66 #ifndef sa_family_t
   67 typedef __sa_family_t   sa_family_t;
   68 #define sa_family_t     __sa_family_t
   69 #endif
   70 
   71 /*
   72  * Protocols
   73  */
   74 #define IPPROTO_IP              0               /* dummy for IP */
   75 #define IPPROTO_HOPOPTS         0               /* IP6 hop-by-hop options */
   76 #define IPPROTO_ICMP            1               /* control message protocol */
   77 #define IPPROTO_IGMP            2               /* group mgmt protocol */
   78 #define IPPROTO_GGP             3               /* gateway^2 (deprecated) */
   79 #define IPPROTO_IPV4            4               /* IP header */
   80 #define IPPROTO_IPIP            4               /* IP inside IP */
   81 #define IPPROTO_TCP             6               /* tcp */
   82 #define IPPROTO_EGP             8               /* exterior gateway protocol */
   83 #define IPPROTO_PUP             12              /* pup */
   84 #define IPPROTO_UDP             17              /* user datagram protocol */
   85 #define IPPROTO_IDP             22              /* xns idp */
   86 #define IPPROTO_TP              29              /* tp-4 w/ class negotiation */
   87 #define IPPROTO_IPV6            41              /* IP6 header */
   88 #define IPPROTO_ROUTING         43              /* IP6 routing header */
   89 #define IPPROTO_FRAGMENT        44              /* IP6 fragmentation header */
   90 #define IPPROTO_RSVP            46              /* resource reservation */
   91 #define IPPROTO_GRE             47              /* GRE encaps RFC 1701 */
   92 #define IPPROTO_ESP             50              /* encap. security payload */
   93 #define IPPROTO_AH              51              /* authentication header */
   94 #define IPPROTO_MOBILE          55              /* IP Mobility RFC 2004 */
   95 #define IPPROTO_IPV6_ICMP       58              /* IPv6 ICMP */
   96 #define IPPROTO_ICMPV6          58              /* ICMP6 */
   97 #define IPPROTO_NONE            59              /* IP6 no next header */
   98 #define IPPROTO_DSTOPTS         60              /* IP6 destination option */
   99 #define IPPROTO_EON             80              /* ISO cnlp */
  100 #define IPPROTO_ENCAP           98              /* encapsulation header */
  101 #define IPPROTO_PIM             103             /* Protocol indep. multicast */
  102 #define IPPROTO_IPCOMP          108             /* IP Payload Comp. Protocol */
  103 #define IPPROTO_VRRP            112             /* VRRP RFC 2338 */
  104 
  105 #define IPPROTO_RAW             255             /* raw IP packet */
  106 #define IPPROTO_MAX             256
  107 
  108 /* last return value of *_input(), meaning "all job for this pkt is done".  */
  109 #define IPPROTO_DONE            257
  110 
  111 /* sysctl placeholder for (FAST_)IPSEC */
  112 #define CTL_IPPROTO_IPSEC       258
  113 
  114 
  115 /*
  116  * Local port number conventions:
  117  *
  118  * Ports < IPPORT_RESERVED are reserved for privileged processes (e.g. root),
  119  * unless a kernel is compiled with IPNOPRIVPORTS defined.
  120  *
  121  * When a user does a bind(2) or connect(2) with a port number of zero,
  122  * a non-conflicting local port address is chosen.
  123  *
  124  * The default range is IPPORT_ANONMIN to IPPORT_ANONMAX, although
  125  * that is settable by sysctl(3); net.inet.ip.anonportmin and
  126  * net.inet.ip.anonportmax respectively.
  127  *
  128  * A user may set the IPPROTO_IP option IP_PORTRANGE to change this
  129  * default assignment range.
  130  *
  131  * The value IP_PORTRANGE_DEFAULT causes the default behavior.
  132  *
  133  * The value IP_PORTRANGE_HIGH is the same as IP_PORTRANGE_DEFAULT,
  134  * and exists only for FreeBSD compatibility purposes.
  135  *
  136  * The value IP_PORTRANGE_LOW changes the range to the "low" are
  137  * that is (by convention) restricted to privileged processes.
  138  * This convention is based on "vouchsafe" principles only.
  139  * It is only secure if you trust the remote host to restrict these ports.
  140  * The range is IPPORT_RESERVEDMIN to IPPORT_RESERVEDMAX.
  141  */
  142 
  143 #define IPPORT_RESERVED         1024
  144 #define IPPORT_ANONMIN          49152
  145 #define IPPORT_ANONMAX          65535
  146 #define IPPORT_RESERVEDMIN      600
  147 #define IPPORT_RESERVEDMAX      (IPPORT_RESERVED-1)
  148 
  149 /*
  150  * Internet address (a structure for historical reasons)
  151  */
  152 struct in_addr {
  153         in_addr_t s_addr;
  154 } __attribute__((__packed__));
  155 
  156 /*
  157  * Definitions of bits in internet address integers.
  158  * On subnets, the decomposition of addresses to host and net parts
  159  * is done according to subnet mask, not the masks here.
  160  *
  161  * By byte-swapping the constants, we avoid ever having to byte-swap IP
  162  * addresses inside the kernel.  Unfortunately, user-level programs rely
  163  * on these macros not doing byte-swapping.
  164  */
  165 #ifdef _KERNEL
  166 #define __IPADDR(x)     ((uint32_t) htonl((uint32_t)(x)))
  167 #else
  168 #define __IPADDR(x)     ((uint32_t)(x))
  169 #endif
  170 
  171 #define IN_CLASSA(i)            (((uint32_t)(i) & __IPADDR(0x80000000)) == \
  172                                  __IPADDR(0x00000000))
  173 #define IN_CLASSA_NET           __IPADDR(0xff000000)
  174 #define IN_CLASSA_NSHIFT        24
  175 #define IN_CLASSA_HOST          __IPADDR(0x00ffffff)
  176 #define IN_CLASSA_MAX           128
  177 
  178 #define IN_CLASSB(i)            (((uint32_t)(i) & __IPADDR(0xc0000000)) == \
  179                                  __IPADDR(0x80000000))
  180 #define IN_CLASSB_NET           __IPADDR(0xffff0000)
  181 #define IN_CLASSB_NSHIFT        16
  182 #define IN_CLASSB_HOST          __IPADDR(0x0000ffff)
  183 #define IN_CLASSB_MAX           65536
  184 
  185 #define IN_CLASSC(i)            (((uint32_t)(i) & __IPADDR(0xe0000000)) == \
  186                                  __IPADDR(0xc0000000))
  187 #define IN_CLASSC_NET           __IPADDR(0xffffff00)
  188 #define IN_CLASSC_NSHIFT        8
  189 #define IN_CLASSC_HOST          __IPADDR(0x000000ff)
  190 
  191 #define IN_CLASSD(i)            (((uint32_t)(i) & __IPADDR(0xf0000000)) == \
  192                                  __IPADDR(0xe0000000))
  193 /* These ones aren't really net and host fields, but routing needn't know. */
  194 #define IN_CLASSD_NET           __IPADDR(0xf0000000)
  195 #define IN_CLASSD_NSHIFT        28
  196 #define IN_CLASSD_HOST          __IPADDR(0x0fffffff)
  197 #define IN_MULTICAST(i)         IN_CLASSD(i)
  198 
  199 #define IN_EXPERIMENTAL(i)      (((uint32_t)(i) & __IPADDR(0xf0000000)) == \
  200                                  __IPADDR(0xf0000000))
  201 #define IN_BADCLASS(i)          (((uint32_t)(i) & __IPADDR(0xf0000000)) == \
  202                                  __IPADDR(0xf0000000))
  203 
  204 #define IN_LOCAL_GROUP(i)       (((uint32_t)(i) & __IPADDR(0xffffff00)) == \
  205                                  __IPADDR(0xe0000000))
  206 
  207 #define INADDR_ANY              __IPADDR(0x00000000)
  208 #define INADDR_LOOPBACK         __IPADDR(0x7f000001)
  209 #define INADDR_BROADCAST        __IPADDR(0xffffffff)    /* must be masked */
  210 #ifndef _KERNEL
  211 #define INADDR_NONE             __IPADDR(0xffffffff)    /* -1 return */
  212 #endif
  213 
  214 #define INADDR_UNSPEC_GROUP     __IPADDR(0xe0000000)    /* 224.0.0.0 */
  215 #define INADDR_ALLHOSTS_GROUP   __IPADDR(0xe0000001)    /* 224.0.0.1 */
  216 #define INADDR_ALLRTRS_GROUP    __IPADDR(0xe0000002)    /* 224.0.0.2 */
  217 #define INADDR_MAX_LOCAL_GROUP  __IPADDR(0xe00000ff)    /* 224.0.0.255 */
  218 
  219 #define IN_LOOPBACKNET          127                     /* official! */
  220 
  221 /*
  222  * Socket address, internet style.
  223  */
  224 struct sockaddr_in {
  225         uint8_t         sin_len;
  226         sa_family_t     sin_family;
  227         in_port_t       sin_port;
  228         struct in_addr  sin_addr;
  229         __int8_t        sin_zero[8];
  230 };
  231 
  232 #define INET_ADDRSTRLEN                 16
  233 
  234 /*
  235  * Structure used to describe IP options.
  236  * Used to store options internally, to pass them to a process,
  237  * or to restore options retrieved earlier.
  238  * The ip_dst is used for the first-hop gateway when using a source route
  239  * (this gets put into the header proper).
  240  */
  241 struct ip_opts {
  242         struct in_addr  ip_dst;         /* first hop, 0 w/o src rt */
  243 #if defined(__cplusplus)
  244         __int8_t        Ip_opts[40];    /* actually variable in size */
  245 #else
  246         __int8_t        ip_opts[40];    /* actually variable in size */
  247 #endif
  248 };
  249 
  250 /*
  251  * Options for use with [gs]etsockopt at the IP level.
  252  * First word of comment is data type; bool is stored in int.
  253  */
  254 #define IP_OPTIONS              1    /* buf/ip_opts; set/get IP options */
  255 #define IP_HDRINCL              2    /* int; header is included with data */
  256 #define IP_TOS                  3    /* int; IP type of service and preced. */
  257 #define IP_TTL                  4    /* int; IP time to live */
  258 #define IP_RECVOPTS             5    /* bool; receive all IP opts w/dgram */
  259 #define IP_RECVRETOPTS          6    /* bool; receive IP opts for response */
  260 #define IP_RECVDSTADDR          7    /* bool; receive IP dst addr w/dgram */
  261 #define IP_RETOPTS              8    /* ip_opts; set/get IP options */
  262 #define IP_MULTICAST_IF         9    /* in_addr; set/get IP multicast i/f  */
  263 #define IP_MULTICAST_TTL        10   /* u_char; set/get IP multicast ttl */
  264 #define IP_MULTICAST_LOOP       11   /* u_char; set/get IP multicast loopback */
  265 #define IP_ADD_MEMBERSHIP       12   /* ip_mreq; add an IP group membership */
  266 #define IP_DROP_MEMBERSHIP      13   /* ip_mreq; drop an IP group membership */
  267 #define IP_PORTRANGE            19   /* int; range to use for ephemeral port */
  268 #define IP_RECVIF               20   /* bool; receive reception if w/dgram */
  269 #define IP_ERRORMTU             21   /* int; get MTU of last xmit = EMSGSIZE */
  270 #if 1 /*IPSEC*/
  271 #define IP_IPSEC_POLICY         22 /* struct; get/set security policy */
  272 #endif
  273 
  274 /*
  275  * Defaults and limits for options
  276  */
  277 #define IP_DEFAULT_MULTICAST_TTL  1     /* normally limit m'casts to 1 hop  */
  278 #define IP_DEFAULT_MULTICAST_LOOP 1     /* normally hear sends if a member  */
  279 #define IP_MAX_MEMBERSHIPS      20      /* per socket; must fit in one mbuf */
  280 
  281 /*
  282  * Argument structure for IP_ADD_MEMBERSHIP and IP_DROP_MEMBERSHIP.
  283  */
  284 struct ip_mreq {
  285         struct  in_addr imr_multiaddr;  /* IP multicast address of group */
  286         struct  in_addr imr_interface;  /* local IP address of interface */
  287 };
  288 
  289 /*
  290  * Argument for IP_PORTRANGE:
  291  * - which range to search when port is unspecified at bind() or connect()
  292  */
  293 #define IP_PORTRANGE_DEFAULT    0       /* default range */
  294 #define IP_PORTRANGE_HIGH       1       /* same as DEFAULT (FreeBSD compat) */
  295 #define IP_PORTRANGE_LOW        2       /* use privileged range */
  296 
  297 #if defined(_NETBSD_SOURCE)
  298 /*
  299  * Definitions for inet sysctl operations.
  300  *
  301  * Third level is protocol number.
  302  * Fourth level is desired variable within that protocol.
  303  */
  304 #define IPPROTO_MAXID   (IPPROTO_AH + 1)        /* don't list to IPPROTO_MAX */
  305 
  306 #define CTL_IPPROTO_NAMES { \
  307         { "ip", CTLTYPE_NODE }, \
  308         { "icmp", CTLTYPE_NODE }, \
  309         { "igmp", CTLTYPE_NODE }, \
  310         { "ggp", CTLTYPE_NODE }, \
  311         { 0, 0 }, \
  312         { 0, 0 }, \
  313         { "tcp", CTLTYPE_NODE }, \
  314         { 0, 0 }, \
  315         { "egp", CTLTYPE_NODE }, \
  316         { 0, 0 }, \
  317         { 0, 0 }, \
  318         { 0, 0 }, \
  319         { "pup", CTLTYPE_NODE }, \
  320         { 0, 0 }, \
  321         { 0, 0 }, \
  322         { 0, 0 }, \
  323         { 0, 0 }, \
  324         { "udp", CTLTYPE_NODE }, \
  325         { 0, 0 }, \
  326         { 0, 0 }, \
  327         { 0, 0 }, \
  328         { 0, 0 }, \
  329         { "idp", CTLTYPE_NODE }, \
  330         { 0, 0 }, \
  331         { 0, 0 }, \
  332         { 0, 0 }, \
  333         { 0, 0 }, \
  334         { 0, 0 }, \
  335         { 0, 0 }, \
  336         { 0, 0 }, \
  337         { 0, 0 }, \
  338         { 0, 0 }, \
  339         { 0, 0 }, \
  340         { 0, 0 }, \
  341         { 0, 0 }, \
  342         { 0, 0 }, \
  343         { 0, 0 }, \
  344         { 0, 0 }, \
  345         { 0, 0 }, \
  346         { 0, 0 }, \
  347         { 0, 0 }, \
  348         { 0, 0 }, \
  349         { 0, 0 }, \
  350         { 0, 0 }, \
  351         { 0, 0 }, \
  352         { 0, 0 }, \
  353         { 0, 0 }, \
  354         { 0, 0 }, \
  355         { 0, 0 }, \
  356         { 0, 0 }, \
  357         { 0, 0 }, \
  358         { "ipsec", CTLTYPE_NODE }, \
  359 }
  360 
  361 /*
  362  * Names for IP sysctl objects
  363  */
  364 #define IPCTL_FORWARDING        1       /* act as router */
  365 #define IPCTL_SENDREDIRECTS     2       /* may send redirects when forwarding */
  366 #define IPCTL_DEFTTL            3       /* default TTL */
  367 #ifdef notyet
  368 #define IPCTL_DEFMTU            4       /* default MTU */
  369 #endif
  370 #define IPCTL_FORWSRCRT         5       /* forward source-routed packets */
  371 #define IPCTL_DIRECTEDBCAST     6       /* default broadcast behavior */
  372 #define IPCTL_ALLOWSRCRT        7       /* allow/drop all source-routed pkts */
  373 #define IPCTL_SUBNETSARELOCAL   8       /* treat subnets as local addresses */
  374 #define IPCTL_MTUDISC           9       /* allow path MTU discovery */
  375 #define IPCTL_ANONPORTMIN      10       /* minimum ephemeral port */
  376 #define IPCTL_ANONPORTMAX      11       /* maximum ephemeral port */
  377 #define IPCTL_MTUDISCTIMEOUT   12       /* allow path MTU discovery */
  378 #define IPCTL_MAXFLOWS         13       /* maximum ip flows allowed */
  379 #define IPCTL_HOSTZEROBROADCAST 14      /* is host zero a broadcast addr? */
  380 #define IPCTL_GIF_TTL          15       /* default TTL for gif encap packet */
  381 #define IPCTL_LOWPORTMIN       16       /* minimum reserved port */
  382 #define IPCTL_LOWPORTMAX       17       /* maximum reserved port */
  383 #define IPCTL_MAXFRAGPACKETS   18       /* max packets reassembly queue */
  384 #define IPCTL_GRE_TTL          19       /* default TTL for gre encap packet */
  385 #define IPCTL_CHECKINTERFACE   20       /* drop pkts in from 'wrong' iface */
  386 #define IPCTL_IFQ              21       /* ipintrq node */
  387 #define IPCTL_RANDOMID         22       /* use random IP ids (if configured) */
  388 #define IPCTL_MAXID            23
  389 
  390 #define IPCTL_NAMES { \
  391         { 0, 0 }, \
  392         { "forwarding", CTLTYPE_INT }, \
  393         { "redirect", CTLTYPE_INT }, \
  394         { "ttl", CTLTYPE_INT }, \
  395         { "mtu", CTLTYPE_INT }, \
  396         { "forwsrcrt", CTLTYPE_INT }, \
  397         { "directed-broadcast", CTLTYPE_INT }, \
  398         { "allowsrcrt", CTLTYPE_INT }, \
  399         { "subnetsarelocal", CTLTYPE_INT }, \
  400         { "mtudisc", CTLTYPE_INT }, \
  401         { "anonportmin", CTLTYPE_INT }, \
  402         { "anonportmax", CTLTYPE_INT }, \
  403         { "mtudisctimeout", CTLTYPE_INT }, \
  404         { "maxflows", CTLTYPE_INT }, \
  405         { "hostzerobroadcast", CTLTYPE_INT }, \
  406         { "gifttl", CTLTYPE_INT }, \
  407         { "lowportmin", CTLTYPE_INT }, \
  408         { "lowportmax", CTLTYPE_INT }, \
  409         { "maxfragpackets", CTLTYPE_INT }, \
  410         { "grettl", CTLTYPE_INT }, \
  411         { "checkinterface", CTLTYPE_INT }, \
  412         { "ifq", CTLTYPE_NODE }, \
  413         { "random_id", CTLTYPE_INT }, \
  414 }
  415 #endif /* _NETBSD_SOURCE */
  416 
  417 /* INET6 stuff */
  418 #define __KAME_NETINET_IN_H_INCLUDED_
  419 #include <netinet6/in6.h>
  420 #undef __KAME_NETINET_IN_H_INCLUDED_
  421 
  422 #ifdef _KERNEL
  423 /*
  424  * in_cksum_phdr:
  425  *
  426  *      Compute significant parts of the IPv4 checksum pseudo-header
  427  *      for use in a delayed TCP/UDP checksum calculation.
  428  *
  429  *      Args:
  430  *
  431  *              src             Source IP address
  432  *              dst             Destination IP address
  433  *              lenproto        htons(proto-hdr-len + proto-number)
  434  */
  435 static __inline u_int16_t __attribute__((__unused__))
  436 in_cksum_phdr(u_int32_t src, u_int32_t dst, u_int32_t lenproto)
  437 {
  438         u_int32_t sum;
  439 
  440         sum = lenproto +
  441               (u_int16_t)(src >> 16) +
  442               (u_int16_t)(src /*& 0xffff*/) +
  443               (u_int16_t)(dst >> 16) +
  444               (u_int16_t)(dst /*& 0xffff*/);
  445 
  446         sum = (u_int16_t)(sum >> 16) + (u_int16_t)(sum /*& 0xffff*/);
  447 
  448         if (sum > 0xffff)
  449                 sum -= 0xffff;
  450 
  451         return (sum);
  452 }
  453 
  454 /*
  455  * in_cksum_addword:
  456  *
  457  *      Add the two 16-bit network-order values, carry, and return.
  458  */
  459 static __inline u_int16_t __attribute__((__unused__))
  460 in_cksum_addword(u_int16_t a, u_int16_t b)
  461 {
  462         u_int32_t sum = a + b;
  463 
  464         if (sum > 0xffff)
  465                 sum -= 0xffff;
  466 
  467         return (sum);
  468 }
  469 
  470 extern  struct in_addr zeroin_addr;
  471 extern  u_char  ip_protox[];
  472 
  473 int     in_broadcast __P((struct in_addr, struct ifnet *));
  474 int     in_canforward __P((struct in_addr));
  475 int     in_cksum __P((struct mbuf *, int));
  476 int     in4_cksum __P((struct mbuf *, u_int8_t, int, int));
  477 void    in_delayed_cksum __P((struct mbuf *));
  478 int     in_localaddr __P((struct in_addr));
  479 void    in_socktrim __P((struct sockaddr_in *));
  480 
  481 #define in_hosteq(s,t)  ((s).s_addr == (t).s_addr)
  482 #define in_nullhost(x)  ((x).s_addr == INADDR_ANY)
  483 
  484 #define satosin(sa)     ((struct sockaddr_in *)(sa))
  485 #define sintosa(sin)    ((struct sockaddr *)(sin))
  486 #define ifatoia(ifa)    ((struct in_ifaddr *)(ifa))
  487 #endif /* _KERNEL */
  488 
  489 #endif /* !_NETINET_IN_H_ */

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