1/* $NetBSD: in.h,v 1.77 2006/11/13 05:13:41 dyoung 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 45typedef __uint8_t uint8_t; 46#define uint8_t __uint8_t 47#endif 48 49#ifndef uint32_t 50typedef __uint32_t uint32_t; 51#define uint32_t __uint32_t 52#endif 53 54#include <sys/ansi.h> 55 56#ifndef in_addr_t 57typedef __in_addr_t in_addr_t; 58#define in_addr_t __in_addr_t 59#endif 60 61#ifndef in_port_t 62typedef __in_port_t in_port_t; 63#define in_port_t __in_port_t 64#endif 65 66#ifndef sa_family_t 67typedef __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_ETHERIP 97 /* Ethernet-in-IP */ 101#define IPPROTO_ENCAP 98 /* encapsulation header */ 102#define IPPROTO_PIM 103 /* Protocol indep. multicast */ 103#define IPPROTO_IPCOMP 108 /* IP Payload Comp. Protocol */ 104#define IPPROTO_VRRP 112 /* VRRP RFC 2338 */ 105#define IPPROTO_CARP 112 /* Common Address Resolution Protocol */ 106#define IPPROTO_RAW 255 /* raw IP packet */ 107#define IPPROTO_MAX 256 108 109/* last return value of *_input(), meaning "all job for this pkt is done". */ 110#define IPPROTO_DONE 257 111 112/* sysctl placeholder for (FAST_)IPSEC */ 113#define CTL_IPPROTO_IPSEC 258 114 115 116/* 117 * Local port number conventions: 118 * 119 * Ports < IPPORT_RESERVED are reserved for privileged processes (e.g. root), 120 * unless a kernel is compiled with IPNOPRIVPORTS defined. 121 * 122 * When a user does a bind(2) or connect(2) with a port number of zero, 123 * a non-conflicting local port address is chosen. 124 * 125 * The default range is IPPORT_ANONMIN to IPPORT_ANONMAX, although 126 * that is settable by sysctl(3); net.inet.ip.anonportmin and 127 * net.inet.ip.anonportmax respectively. 128 * 129 * A user may set the IPPROTO_IP option IP_PORTRANGE to change this 130 * default assignment range. 131 * 132 * The value IP_PORTRANGE_DEFAULT causes the default behavior. 133 * 134 * The value IP_PORTRANGE_HIGH is the same as IP_PORTRANGE_DEFAULT, 135 * and exists only for FreeBSD compatibility purposes. 136 * 137 * The value IP_PORTRANGE_LOW changes the range to the "low" are 138 * that is (by convention) restricted to privileged processes. 139 * This convention is based on "vouchsafe" principles only. 140 * It is only secure if you trust the remote host to restrict these ports. 141 * The range is IPPORT_RESERVEDMIN to IPPORT_RESERVEDMAX. 142 */ 143 144#define IPPORT_RESERVED 1024 145#define IPPORT_ANONMIN 49152 146#define IPPORT_ANONMAX 65535 147#define IPPORT_RESERVEDMIN 600 148#define IPPORT_RESERVEDMAX (IPPORT_RESERVED-1) 149 150/* 151 * Internet address (a structure for historical reasons) 152 */ 153struct in_addr { 154 in_addr_t s_addr; 155} __attribute__((__packed__)); 156 157/* 158 * Definitions of bits in internet address integers. 159 * On subnets, the decomposition of addresses to host and net parts 160 * is done according to subnet mask, not the masks here. 161 * 162 * By byte-swapping the constants, we avoid ever having to byte-swap IP 163 * addresses inside the kernel. Unfortunately, user-level programs rely 164 * on these macros not doing byte-swapping. 165 */ 166#ifdef _KERNEL 167#define __IPADDR(x) ((uint32_t) htonl((uint32_t)(x))) 168#else 169#define __IPADDR(x) ((uint32_t)(x)) 170#endif 171 172#define IN_CLASSA(i) (((uint32_t)(i) & __IPADDR(0x80000000)) == \ 173 __IPADDR(0x00000000)) 174#define IN_CLASSA_NET __IPADDR(0xff000000) 175#define IN_CLASSA_NSHIFT 24 176#define IN_CLASSA_HOST __IPADDR(0x00ffffff) 177#define IN_CLASSA_MAX 128 178 179#define IN_CLASSB(i) (((uint32_t)(i) & __IPADDR(0xc0000000)) == \ 180 __IPADDR(0x80000000)) 181#define IN_CLASSB_NET __IPADDR(0xffff0000) 182#define IN_CLASSB_NSHIFT 16 183#define IN_CLASSB_HOST __IPADDR(0x0000ffff) 184#define IN_CLASSB_MAX 65536 185 186#define IN_CLASSC(i) (((uint32_t)(i) & __IPADDR(0xe0000000)) == \ 187 __IPADDR(0xc0000000)) 188#define IN_CLASSC_NET __IPADDR(0xffffff00) 189#define IN_CLASSC_NSHIFT 8 190#define IN_CLASSC_HOST __IPADDR(0x000000ff) 191 192#define IN_CLASSD(i) (((uint32_t)(i) & __IPADDR(0xf0000000)) == \ 193 __IPADDR(0xe0000000)) 194/* These ones aren't really net and host fields, but routing needn't know. */ 195#define IN_CLASSD_NET __IPADDR(0xf0000000) 196#define IN_CLASSD_NSHIFT 28 197#define IN_CLASSD_HOST __IPADDR(0x0fffffff) 198#define IN_MULTICAST(i) IN_CLASSD(i) 199 200#define IN_EXPERIMENTAL(i) (((uint32_t)(i) & __IPADDR(0xf0000000)) == \ 201 __IPADDR(0xf0000000)) 202#define IN_BADCLASS(i) (((uint32_t)(i) & __IPADDR(0xf0000000)) == \ 203 __IPADDR(0xf0000000)) 204 205#define IN_LINKLOCAL(i) (((uint32_t)(i) & __IPADDR(0xffff0000)) == \ 206 __IPADDR(0xa9fe0000)) 207 208#define IN_PRIVATE(i) ((((uint32_t)(i) & __IPADDR(0xff000000)) == \ 209 __IPADDR(0x0a000000)) || \ 210 (((uint32_t)(i) & __IPADDR(0xfff00000)) == \ 211 __IPADDR(0xac100000)) || \ 212 (((uint32_t)(i) & __IPADDR(0xffff0000)) == \ 213 __IPADDR(0xc0a80000))) 214 215#define IN_LOCAL_GROUP(i) (((uint32_t)(i) & __IPADDR(0xffffff00)) == \ 216 __IPADDR(0xe0000000)) 217 218#define IN_ANY_LOCAL(i) (IN_LINKLOCAL(i) || IN_LOCAL_GROUP(i)) 219 220#define INADDR_ANY __IPADDR(0x00000000) 221#define INADDR_LOOPBACK __IPADDR(0x7f000001) 222#define INADDR_BROADCAST __IPADDR(0xffffffff) /* must be masked */ 223#define INADDR_NONE __IPADDR(0xffffffff) /* -1 return */ 224 225#define INADDR_UNSPEC_GROUP __IPADDR(0xe0000000) /* 224.0.0.0 */ 226#define INADDR_ALLHOSTS_GROUP __IPADDR(0xe0000001) /* 224.0.0.1 */ 227#define INADDR_ALLRTRS_GROUP __IPADDR(0xe0000002) /* 224.0.0.2 */ 228#define INADDR_CARP_GROUP __IPADDR(0xe0000012) /* 224.0.0.18 */ 229#define INADDR_MAX_LOCAL_GROUP __IPADDR(0xe00000ff) /* 224.0.0.255 */ 230 231#define IN_LOOPBACKNET 127 /* official! */ 232 233/* 234 * Socket address, internet style. 235 */ 236struct sockaddr_in { 237 uint8_t sin_len; 238 sa_family_t sin_family; 239 in_port_t sin_port; 240 struct in_addr sin_addr; 241 __int8_t sin_zero[8]; 242}; 243 244#define INET_ADDRSTRLEN 16 245 246/* 247 * Structure used to describe IP options. 248 * Used to store options internally, to pass them to a process, 249 * or to restore options retrieved earlier. 250 * The ip_dst is used for the first-hop gateway when using a source route 251 * (this gets put into the header proper). 252 */ 253struct ip_opts { 254 struct in_addr ip_dst; /* first hop, 0 w/o src rt */ 255#if defined(__cplusplus) 256 __int8_t Ip_opts[40]; /* actually variable in size */ 257#else 258 __int8_t ip_opts[40]; /* actually variable in size */ 259#endif 260}; 261 262/* 263 * Options for use with [gs]etsockopt at the IP level. 264 * First word of comment is data type; bool is stored in int. 265 */ 266#define IP_OPTIONS 1 /* buf/ip_opts; set/get IP options */ 267#define IP_HDRINCL 2 /* int; header is included with data */ 268#define IP_TOS 3 /* int; IP type of service and preced. */ 269#define IP_TTL 4 /* int; IP time to live */ 270#define IP_RECVOPTS 5 /* bool; receive all IP opts w/dgram */ 271#define IP_RECVRETOPTS 6 /* bool; receive IP opts for response */ 272#define IP_RECVDSTADDR 7 /* bool; receive IP dst addr w/dgram */ 273#define IP_RETOPTS 8 /* ip_opts; set/get IP options */ 274#define IP_MULTICAST_IF 9 /* in_addr; set/get IP multicast i/f */ 275#define IP_MULTICAST_TTL 10 /* u_char; set/get IP multicast ttl */ 276#define IP_MULTICAST_LOOP 11 /* u_char; set/get IP multicast loopback */ 277#define IP_ADD_MEMBERSHIP 12 /* ip_mreq; add an IP group membership */ 278#define IP_DROP_MEMBERSHIP 13 /* ip_mreq; drop an IP group membership */ 279#define IP_PORTRANGE 19 /* int; range to use for ephemeral port */ 280#define IP_RECVIF 20 /* bool; receive reception if w/dgram */ 281#define IP_ERRORMTU 21 /* int; get MTU of last xmit = EMSGSIZE */ 282#if 1 /*IPSEC*/ 283#define IP_IPSEC_POLICY 22 /* struct; get/set security policy */ 284#endif 285 286/* 287 * Defaults and limits for options 288 */ 289#define IP_DEFAULT_MULTICAST_TTL 1 /* normally limit m'casts to 1 hop */ 290#define IP_DEFAULT_MULTICAST_LOOP 1 /* normally hear sends if a member */ 291#define IP_MAX_MEMBERSHIPS 20 /* per socket; must fit in one mbuf */ 292 293/* 294 * Argument structure for IP_ADD_MEMBERSHIP and IP_DROP_MEMBERSHIP. 295 */ 296struct ip_mreq { 297 struct in_addr imr_multiaddr; /* IP multicast address of group */ 298 struct in_addr imr_interface; /* local IP address of interface */ 299}; 300 301/* 302 * Argument for IP_PORTRANGE: 303 * - which range to search when port is unspecified at bind() or connect() 304 */ 305#define IP_PORTRANGE_DEFAULT 0 /* default range */ 306#define IP_PORTRANGE_HIGH 1 /* same as DEFAULT (FreeBSD compat) */ 307#define IP_PORTRANGE_LOW 2 /* use privileged range */ 308 309#if defined(_NETBSD_SOURCE) 310/* 311 * Definitions for inet sysctl operations. 312 * 313 * Third level is protocol number. 314 * Fourth level is desired variable within that protocol. 315 */ 316#define IPPROTO_MAXID (IPPROTO_AH + 1) /* don't list to IPPROTO_MAX */ 317 318#define CTL_IPPROTO_NAMES { \ 319 { "ip", CTLTYPE_NODE }, \ 320 { "icmp", CTLTYPE_NODE }, \ 321 { "igmp", CTLTYPE_NODE }, \ 322 { "ggp", CTLTYPE_NODE }, \ 323 { 0, 0 }, \ 324 { 0, 0 }, \ 325 { "tcp", CTLTYPE_NODE }, \ 326 { 0, 0 }, \ 327 { "egp", CTLTYPE_NODE }, \ 328 { 0, 0 }, \ 329 { 0, 0 }, \ 330 { 0, 0 }, \ 331 { "pup", CTLTYPE_NODE }, \ 332 { 0, 0 }, \ 333 { 0, 0 }, \ 334 { 0, 0 }, \ 335 { 0, 0 }, \ 336 { "udp", CTLTYPE_NODE }, \ 337 { 0, 0 }, \ 338 { 0, 0 }, \ 339 { 0, 0 }, \ 340 { 0, 0 }, \ 341 { "idp", CTLTYPE_NODE }, \ 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 { 0, 0 }, \ 359 { 0, 0 }, \ 360 { 0, 0 }, \ 361 { 0, 0 }, \ 362 { 0, 0 }, \ 363 { 0, 0 }, \ 364 { 0, 0 }, \ 365 { 0, 0 }, \ 366 { 0, 0 }, \ 367 { 0, 0 }, \ 368 { 0, 0 }, \ 369 { 0, 0 }, \ 370 { "ipsec", CTLTYPE_NODE }, \ 371 { 0, 0 }, \ 372 { 0, 0 }, \ 373 { 0, 0 }, \ 374 { 0, 0 }, \ 375 { 0, 0 }, \ 376 { 0, 0 }, \ 377 { 0, 0 }, \ 378 { 0, 0 }, \ 379 { 0, 0 }, \ 380 { 0, 0 }, \ 381 { 0, 0 }, \ 382 { 0, 0 }, \ 383 { 0, 0 }, \ 384 { 0, 0 }, \ 385 { 0, 0 }, \ 386 { 0, 0 }, \ 387 { 0, 0 }, \ 388 { 0, 0 }, \ 389 { 0, 0 }, \ 390 { 0, 0 }, \ 391 { 0, 0 }, \ 392 { 0, 0 }, \ 393 { 0, 0 }, \ 394 { 0, 0 }, \ 395 { 0, 0 }, \ 396 { 0, 0 }, \ 397 { 0, 0 }, \ 398 { 0, 0 }, \ 399 { 0, 0 }, \ 400 { 0, 0 }, \ 401 { 0, 0 }, \ 402 { 0, 0 }, \ 403 { 0, 0 }, \ 404 { 0, 0 }, \ 405 { 0, 0 }, \ 406 { 0, 0 }, \ 407 { 0, 0 }, \ 408 { 0, 0 }, \ 409 { 0, 0 }, \ 410 { 0, 0 }, \ 411 { 0, 0 }, \ 412 { 0, 0 }, \ 413 { 0, 0 }, \ 414 { 0, 0 }, \ 415 { 0, 0 }, \ 416 { 0, 0 }, \ 417 { 0, 0 }, \ 418 { 0, 0 }, \ 419 { 0, 0 }, \ 420 { 0, 0 }, \ 421 { 0, 0 }, \ 422 { "pim", CTLTYPE_NODE }, \ 423} 424 425/* 426 * Names for IP sysctl objects 427 */ 428#define IPCTL_FORWARDING 1 /* act as router */ 429#define IPCTL_SENDREDIRECTS 2 /* may send redirects when forwarding */ 430#define IPCTL_DEFTTL 3 /* default TTL */ 431#ifdef notyet 432#define IPCTL_DEFMTU 4 /* default MTU */ 433#endif 434#define IPCTL_FORWSRCRT 5 /* forward source-routed packets */ 435#define IPCTL_DIRECTEDBCAST 6 /* default broadcast behavior */ 436#define IPCTL_ALLOWSRCRT 7 /* allow/drop all source-routed pkts */ 437#define IPCTL_SUBNETSARELOCAL 8 /* treat subnets as local addresses */ 438#define IPCTL_MTUDISC 9 /* allow path MTU discovery */ 439#define IPCTL_ANONPORTMIN 10 /* minimum ephemeral port */ 440#define IPCTL_ANONPORTMAX 11 /* maximum ephemeral port */ 441#define IPCTL_MTUDISCTIMEOUT 12 /* allow path MTU discovery */ 442#define IPCTL_MAXFLOWS 13 /* maximum ip flows allowed */ 443#define IPCTL_HOSTZEROBROADCAST 14 /* is host zero a broadcast addr? */ 444#define IPCTL_GIF_TTL 15 /* default TTL for gif encap packet */ 445#define IPCTL_LOWPORTMIN 16 /* minimum reserved port */ 446#define IPCTL_LOWPORTMAX 17 /* maximum reserved port */ 447#define IPCTL_MAXFRAGPACKETS 18 /* max packets reassembly queue */ 448#define IPCTL_GRE_TTL 19 /* default TTL for gre encap packet */ 449#define IPCTL_CHECKINTERFACE 20 /* drop pkts in from 'wrong' iface */ 450#define IPCTL_IFQ 21 /* ipintrq node */ 451#define IPCTL_RANDOMID 22 /* use random IP ids (if configured) */ 452#define IPCTL_LOOPBACKCKSUM 23 /* do IP checksum on loopback */ 453#define IPCTL_STATS 24 /* IP statistics */ 454#define IPCTL_MAXID 25 455 456#define IPCTL_NAMES { \ 457 { 0, 0 }, \ 458 { "forwarding", CTLTYPE_INT }, \ 459 { "redirect", CTLTYPE_INT }, \ 460 { "ttl", CTLTYPE_INT }, \ 461 { "mtu", CTLTYPE_INT }, \ 462 { "forwsrcrt", CTLTYPE_INT }, \ 463 { "directed-broadcast", CTLTYPE_INT }, \ 464 { "allowsrcrt", CTLTYPE_INT }, \ 465 { "subnetsarelocal", CTLTYPE_INT }, \ 466 { "mtudisc", CTLTYPE_INT }, \ 467 { "anonportmin", CTLTYPE_INT }, \ 468 { "anonportmax", CTLTYPE_INT }, \ 469 { "mtudisctimeout", CTLTYPE_INT }, \ 470 { "maxflows", CTLTYPE_INT }, \ 471 { "hostzerobroadcast", CTLTYPE_INT }, \ 472 { "gifttl", CTLTYPE_INT }, \ 473 { "lowportmin", CTLTYPE_INT }, \ 474 { "lowportmax", CTLTYPE_INT }, \ 475 { "maxfragpackets", CTLTYPE_INT }, \ 476 { "grettl", CTLTYPE_INT }, \ 477 { "checkinterface", CTLTYPE_INT }, \ 478 { "ifq", CTLTYPE_NODE }, \ 479 { "random_id", CTLTYPE_INT }, \ 480 { "do_loopback_cksum", CTLTYPE_INT }, \ 481 { "stats", CTLTYPE_STRUCT }, \ 482} 483#endif /* _NETBSD_SOURCE */ 484 485/* INET6 stuff */ 486#define __KAME_NETINET_IN_H_INCLUDED_ 487#include <netinet6/in6.h> 488#undef __KAME_NETINET_IN_H_INCLUDED_ 489 490#ifdef _KERNEL 491/* 492 * in_cksum_phdr: 493 * 494 * Compute significant parts of the IPv4 checksum pseudo-header 495 * for use in a delayed TCP/UDP checksum calculation. 496 * 497 * Args: 498 * 499 * src Source IP address 500 * dst Destination IP address 501 * lenproto htons(proto-hdr-len + proto-number) 502 */ 503static __inline u_int16_t __attribute__((__unused__)) 504in_cksum_phdr(u_int32_t src, u_int32_t dst, u_int32_t lenproto) 505{ 506 u_int32_t sum; 507 508 sum = lenproto + 509 (u_int16_t)(src >> 16) + 510 (u_int16_t)(src /*& 0xffff*/) + 511 (u_int16_t)(dst >> 16) + 512 (u_int16_t)(dst /*& 0xffff*/); 513 514 sum = (u_int16_t)(sum >> 16) + (u_int16_t)(sum /*& 0xffff*/); 515 516 if (sum > 0xffff) 517 sum -= 0xffff; 518 519 return (sum); 520} 521 522/* 523 * in_cksum_addword: 524 * 525 * Add the two 16-bit network-order values, carry, and return. 526 */ 527static __inline u_int16_t __attribute__((__unused__)) 528in_cksum_addword(u_int16_t a, u_int16_t b) 529{ 530 u_int32_t sum = a + b; 531 532 if (sum > 0xffff) 533 sum -= 0xffff; 534 535 return (sum); 536} 537 538extern struct in_addr zeroin_addr; 539extern u_char ip_protox[]; 540 541int in_broadcast(struct in_addr, struct ifnet *); 542int in_canforward(struct in_addr); 543int in_cksum(struct mbuf *, int); 544int in4_cksum(struct mbuf *, u_int8_t, int, int); 545void in_delayed_cksum(struct mbuf *); 546int in_localaddr(struct in_addr); 547void in_socktrim(struct sockaddr_in *); 548 549#define in_hosteq(s,t) ((s).s_addr == (t).s_addr) 550#define in_nullhost(x) ((x).s_addr == INADDR_ANY) 551 552#define satosin(sa) ((struct sockaddr_in *)(sa)) 553#define sintosa(sin) ((struct sockaddr *)(sin)) 554#define ifatoia(ifa) ((struct in_ifaddr *)(ifa)) 555#endif /* _KERNEL */ 556 557#endif /* !_NETINET_IN_H_ */ 558