1 /* $NetBSD: in.h,v 1.72 2005/12/11 12:24:57 christos 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_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 */ 105 106 #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 */ 153 struct 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_LOCAL_GROUP(i) (((uint32_t)(i) & __IPADDR(0xffffff00)) == \ 206 __IPADDR(0xe0000000)) 207 208 #define INADDR_ANY __IPADDR(0x00000000) 209 #define INADDR_LOOPBACK __IPADDR(0x7f000001) 210 #define INADDR_BROADCAST __IPADDR(0xffffffff) /* must be masked */ 211 #ifndef _KERNEL 212 #define INADDR_NONE __IPADDR(0xffffffff) /* -1 return */ 213 #endif 214 215 #define INADDR_UNSPEC_GROUP __IPADDR(0xe0000000) /* 224.0.0.0 */ 216 #define INADDR_ALLHOSTS_GROUP __IPADDR(0xe0000001) /* 224.0.0.1 */ 217 #define INADDR_ALLRTRS_GROUP __IPADDR(0xe0000002) /* 224.0.0.2 */ 218 #define INADDR_MAX_LOCAL_GROUP __IPADDR(0xe00000ff) /* 224.0.0.255 */ 219 220 #define IN_LOOPBACKNET 127 /* official! */ 221 222 /* 223 * Socket address, internet style. 224 */ 225 struct sockaddr_in { 226 uint8_t sin_len; 227 sa_family_t sin_family; 228 in_port_t sin_port; 229 struct in_addr sin_addr; 230 __int8_t sin_zero[8]; 231 }; 232 233 #define INET_ADDRSTRLEN 16 234 235 /* 236 * Structure used to describe IP options. 237 * Used to store options internally, to pass them to a process, 238 * or to restore options retrieved earlier. 239 * The ip_dst is used for the first-hop gateway when using a source route 240 * (this gets put into the header proper). 241 */ 242 struct ip_opts { 243 struct in_addr ip_dst; /* first hop, 0 w/o src rt */ 244 #if defined(__cplusplus) 245 __int8_t Ip_opts[40]; /* actually variable in size */ 246 #else 247 __int8_t ip_opts[40]; /* actually variable in size */ 248 #endif 249 }; 250 251 /* 252 * Options for use with [gs]etsockopt at the IP level. 253 * First word of comment is data type; bool is stored in int. 254 */ 255 #define IP_OPTIONS 1 /* buf/ip_opts; set/get IP options */ 256 #define IP_HDRINCL 2 /* int; header is included with data */ 257 #define IP_TOS 3 /* int; IP type of service and preced. */ 258 #define IP_TTL 4 /* int; IP time to live */ 259 #define IP_RECVOPTS 5 /* bool; receive all IP opts w/dgram */ 260 #define IP_RECVRETOPTS 6 /* bool; receive IP opts for response */ 261 #define IP_RECVDSTADDR 7 /* bool; receive IP dst addr w/dgram */ 262 #define IP_RETOPTS 8 /* ip_opts; set/get IP options */ 263 #define IP_MULTICAST_IF 9 /* in_addr; set/get IP multicast i/f */ 264 #define IP_MULTICAST_TTL 10 /* u_char; set/get IP multicast ttl */ 265 #define IP_MULTICAST_LOOP 11 /* u_char; set/get IP multicast loopback */ 266 #define IP_ADD_MEMBERSHIP 12 /* ip_mreq; add an IP group membership */ 267 #define IP_DROP_MEMBERSHIP 13 /* ip_mreq; drop an IP group membership */ 268 #define IP_PORTRANGE 19 /* int; range to use for ephemeral port */ 269 #define IP_RECVIF 20 /* bool; receive reception if w/dgram */ 270 #define IP_ERRORMTU 21 /* int; get MTU of last xmit = EMSGSIZE */ 271 #if 1 /*IPSEC*/ 272 #define IP_IPSEC_POLICY 22 /* struct; get/set security policy */ 273 #endif 274 275 /* 276 * Defaults and limits for options 277 */ 278 #define IP_DEFAULT_MULTICAST_TTL 1 /* normally limit m'casts to 1 hop */ 279 #define IP_DEFAULT_MULTICAST_LOOP 1 /* normally hear sends if a member */ 280 #define IP_MAX_MEMBERSHIPS 20 /* per socket; must fit in one mbuf */ 281 282 /* 283 * Argument structure for IP_ADD_MEMBERSHIP and IP_DROP_MEMBERSHIP. 284 */ 285 struct ip_mreq { 286 struct in_addr imr_multiaddr; /* IP multicast address of group */ 287 struct in_addr imr_interface; /* local IP address of interface */ 288 }; 289 290 /* 291 * Argument for IP_PORTRANGE: 292 * - which range to search when port is unspecified at bind() or connect() 293 */ 294 #define IP_PORTRANGE_DEFAULT 0 /* default range */ 295 #define IP_PORTRANGE_HIGH 1 /* same as DEFAULT (FreeBSD compat) */ 296 #define IP_PORTRANGE_LOW 2 /* use privileged range */ 297 298 #if defined(_NETBSD_SOURCE) 299 /* 300 * Definitions for inet sysctl operations. 301 * 302 * Third level is protocol number. 303 * Fourth level is desired variable within that protocol. 304 */ 305 #define IPPROTO_MAXID (IPPROTO_AH + 1) /* don't list to IPPROTO_MAX */ 306 307 #define CTL_IPPROTO_NAMES { \ 308 { "ip", CTLTYPE_NODE }, \ 309 { "icmp", CTLTYPE_NODE }, \ 310 { "igmp", CTLTYPE_NODE }, \ 311 { "ggp", CTLTYPE_NODE }, \ 312 { 0, 0 }, \ 313 { 0, 0 }, \ 314 { "tcp", CTLTYPE_NODE }, \ 315 { 0, 0 }, \ 316 { "egp", CTLTYPE_NODE }, \ 317 { 0, 0 }, \ 318 { 0, 0 }, \ 319 { 0, 0 }, \ 320 { "pup", CTLTYPE_NODE }, \ 321 { 0, 0 }, \ 322 { 0, 0 }, \ 323 { 0, 0 }, \ 324 { 0, 0 }, \ 325 { "udp", CTLTYPE_NODE }, \ 326 { 0, 0 }, \ 327 { 0, 0 }, \ 328 { 0, 0 }, \ 329 { 0, 0 }, \ 330 { "idp", CTLTYPE_NODE }, \ 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 { 0, 0 }, \ 359 { "ipsec", CTLTYPE_NODE }, \ 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 { 0, 0 }, \ 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 { "pim", CTLTYPE_NODE }, \ 412 } 413 414 /* 415 * Names for IP sysctl objects 416 */ 417 #define IPCTL_FORWARDING 1 /* act as router */ 418 #define IPCTL_SENDREDIRECTS 2 /* may send redirects when forwarding */ 419 #define IPCTL_DEFTTL 3 /* default TTL */ 420 #ifdef notyet 421 #define IPCTL_DEFMTU 4 /* default MTU */ 422 #endif 423 #define IPCTL_FORWSRCRT 5 /* forward source-routed packets */ 424 #define IPCTL_DIRECTEDBCAST 6 /* default broadcast behavior */ 425 #define IPCTL_ALLOWSRCRT 7 /* allow/drop all source-routed pkts */ 426 #define IPCTL_SUBNETSARELOCAL 8 /* treat subnets as local addresses */ 427 #define IPCTL_MTUDISC 9 /* allow path MTU discovery */ 428 #define IPCTL_ANONPORTMIN 10 /* minimum ephemeral port */ 429 #define IPCTL_ANONPORTMAX 11 /* maximum ephemeral port */ 430 #define IPCTL_MTUDISCTIMEOUT 12 /* allow path MTU discovery */ 431 #define IPCTL_MAXFLOWS 13 /* maximum ip flows allowed */ 432 #define IPCTL_HOSTZEROBROADCAST 14 /* is host zero a broadcast addr? */ 433 #define IPCTL_GIF_TTL 15 /* default TTL for gif encap packet */ 434 #define IPCTL_LOWPORTMIN 16 /* minimum reserved port */ 435 #define IPCTL_LOWPORTMAX 17 /* maximum reserved port */ 436 #define IPCTL_MAXFRAGPACKETS 18 /* max packets reassembly queue */ 437 #define IPCTL_GRE_TTL 19 /* default TTL for gre encap packet */ 438 #define IPCTL_CHECKINTERFACE 20 /* drop pkts in from 'wrong' iface */ 439 #define IPCTL_IFQ 21 /* ipintrq node */ 440 #define IPCTL_RANDOMID 22 /* use random IP ids (if configured) */ 441 #define IPCTL_LOOPBACKCKSUM 23 /* do IP checksum on loopback */ 442 #define IPCTL_STATS 24 /* IP statistics */ 443 #define IPCTL_MAXID 25 444 445 #define IPCTL_NAMES { \ 446 { 0, 0 }, \ 447 { "forwarding", CTLTYPE_INT }, \ 448 { "redirect", CTLTYPE_INT }, \ 449 { "ttl", CTLTYPE_INT }, \ 450 { "mtu", CTLTYPE_INT }, \ 451 { "forwsrcrt", CTLTYPE_INT }, \ 452 { "directed-broadcast", CTLTYPE_INT }, \ 453 { "allowsrcrt", CTLTYPE_INT }, \ 454 { "subnetsarelocal", CTLTYPE_INT }, \ 455 { "mtudisc", CTLTYPE_INT }, \ 456 { "anonportmin", CTLTYPE_INT }, \ 457 { "anonportmax", CTLTYPE_INT }, \ 458 { "mtudisctimeout", CTLTYPE_INT }, \ 459 { "maxflows", CTLTYPE_INT }, \ 460 { "hostzerobroadcast", CTLTYPE_INT }, \ 461 { "gifttl", CTLTYPE_INT }, \ 462 { "lowportmin", CTLTYPE_INT }, \ 463 { "lowportmax", CTLTYPE_INT }, \ 464 { "maxfragpackets", CTLTYPE_INT }, \ 465 { "grettl", CTLTYPE_INT }, \ 466 { "checkinterface", CTLTYPE_INT }, \ 467 { "ifq", CTLTYPE_NODE }, \ 468 { "random_id", CTLTYPE_INT }, \ 469 { "do_loopback_cksum", CTLTYPE_INT }, \ 470 { "stats", CTLTYPE_STRUCT }, \ 471 } 472 #endif /* _NETBSD_SOURCE */ 473 474 /* INET6 stuff */ 475 #define __KAME_NETINET_IN_H_INCLUDED_ 476 #include <netinet6/in6.h> 477 #undef __KAME_NETINET_IN_H_INCLUDED_ 478 479 #ifdef _KERNEL 480 /* 481 * in_cksum_phdr: 482 * 483 * Compute significant parts of the IPv4 checksum pseudo-header 484 * for use in a delayed TCP/UDP checksum calculation. 485 * 486 * Args: 487 * 488 * src Source IP address 489 * dst Destination IP address 490 * lenproto htons(proto-hdr-len + proto-number) 491 */ 492 static __inline u_int16_t __attribute__((__unused__)) 493 in_cksum_phdr(u_int32_t src, u_int32_t dst, u_int32_t lenproto) 494 { 495 u_int32_t sum; 496 497 sum = lenproto + 498 (u_int16_t)(src >> 16) + 499 (u_int16_t)(src /*& 0xffff*/) + 500 (u_int16_t)(dst >> 16) + 501 (u_int16_t)(dst /*& 0xffff*/); 502 503 sum = (u_int16_t)(sum >> 16) + (u_int16_t)(sum /*& 0xffff*/); 504 505 if (sum > 0xffff) 506 sum -= 0xffff; 507 508 return (sum); 509 } 510 511 /* 512 * in_cksum_addword: 513 * 514 * Add the two 16-bit network-order values, carry, and return. 515 */ 516 static __inline u_int16_t __attribute__((__unused__)) 517 in_cksum_addword(u_int16_t a, u_int16_t b) 518 { 519 u_int32_t sum = a + b; 520 521 if (sum > 0xffff) 522 sum -= 0xffff; 523 524 return (sum); 525 } 526 527 extern struct in_addr zeroin_addr; 528 extern u_char ip_protox[]; 529 530 int in_broadcast(struct in_addr, struct ifnet *); 531 int in_canforward(struct in_addr); 532 int in_cksum(struct mbuf *, int); 533 int in4_cksum(struct mbuf *, u_int8_t, int, int); 534 void in_delayed_cksum(struct mbuf *); 535 int in_localaddr(struct in_addr); 536 void in_socktrim(struct sockaddr_in *); 537 538 #define in_hosteq(s,t) ((s).s_addr == (t).s_addr) 539 #define in_nullhost(x) ((x).s_addr == INADDR_ANY) 540 541 #define satosin(sa) ((struct sockaddr_in *)(sa)) 542 #define sintosa(sin) ((struct sockaddr *)(sin)) 543 #define ifatoia(ifa) ((struct in_ifaddr *)(ifa)) 544 #endif /* _KERNEL */ 545 546 #endif /* !_NETINET_IN_H_ */ 547