in.h revision 1.37
1 /* $NetBSD: in.h,v 1.37 1998/09/13 20:27:48 hwr 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)in.h 8.3 (Berkeley) 1/3/94 36 */ 37 38 /* 39 * Constants and structures defined by the internet system, 40 * Per RFC 790, September 1981, and numerous additions. 41 */ 42 43 #ifndef _NETINET_IN_H_ 44 #define _NETINET_IN_H_ 45 46 /* 47 * Protocols 48 */ 49 #define IPPROTO_IP 0 /* dummy for IP */ 50 #define IPPROTO_ICMP 1 /* control message protocol */ 51 #define IPPROTO_IGMP 2 /* group mgmt protocol */ 52 #define IPPROTO_GGP 3 /* gateway^2 (deprecated) */ 53 #define IPPROTO_IPIP 4 /* IP inside IP */ 54 #define IPPROTO_TCP 6 /* tcp */ 55 #define IPPROTO_EGP 8 /* exterior gateway protocol */ 56 #define IPPROTO_PUP 12 /* pup */ 57 #define IPPROTO_UDP 17 /* user datagram protocol */ 58 #define IPPROTO_IDP 22 /* xns idp */ 59 #define IPPROTO_TP 29 /* tp-4 w/ class negotiation */ 60 #define IPPROTO_GRE 47 /* GRE encaps RFC 1701 */ 61 #define IPPROTO_ESP 50 /* encap. security payload */ 62 #define IPPROTO_AH 51 /* authentication header */ 63 #define IPPROTO_EON 80 /* ISO cnlp */ 64 #define IPPROTO_ENCAP 98 /* encapsulation header */ 65 66 #define IPPROTO_RAW 255 /* raw IP packet */ 67 #define IPPROTO_MAX 256 68 69 70 /* 71 * Local port number conventions: 72 * 73 * Ports < IPPORT_RESERVED are reserved for privileged processes (e.g. root), 74 * unless a kernel is compiled with IPNOPRIVPORTS defined. 75 * 76 * When a user does a bind(2) or connect(2) with a port number of zero, 77 * a non-conflicting local port address is chosen. 78 * 79 * The default range is IPPORT_ANONMIX to IPPORT_ANONMAX, although 80 * that is settable by sysctl(3); net.inet.ip.anonportmin and 81 * net.inet.ip.anonportmax respectively. 82 * 83 * A user may set the IPPROTO_IP option IP_PORTRANGE to change this 84 * default assignment range. 85 * 86 * The value IP_PORTRANGE_DEFAULT causes the default behavior. 87 * 88 * The value IP_PORTRANGE_HIGH is the same as IP_PORTRANGE_DEFAULT, 89 * and exists only for FreeBSD compatibility purposes. 90 * 91 * The value IP_PORTRANGE_LOW changes the range to the "low" are 92 * that is (by convention) restricted to privileged processes. 93 * This convention is based on "vouchsafe" principles only. 94 * It is only secure if you trust the remote host to restrict these ports. 95 * The range is IPPORT_RESERVEDMIN to IPPORT_RESERVEDMAX. 96 */ 97 98 #define IPPORT_RESERVED 1024 99 #define IPPORT_ANONMIN 49152 100 #define IPPORT_ANONMAX 65535 101 #define IPPORT_RESERVEDMIN 600 102 #define IPPORT_RESERVEDMAX (IPPORT_RESERVED-1) 103 104 /* 105 * Internet address (a structure for historical reasons) 106 */ 107 struct in_addr { 108 u_int32_t s_addr; 109 }; 110 111 /* 112 * Definitions of bits in internet address integers. 113 * On subnets, the decomposition of addresses to host and net parts 114 * is done according to subnet mask, not the masks here. 115 * 116 * By byte-swapping the constants, we avoid ever having to byte-swap IP 117 * addresses inside the kernel. Unfortunately, user-level programs rely 118 * on these macros not doing byte-swapping. 119 */ 120 #ifdef _KERNEL 121 #define __IPADDR(x) ((u_int32_t) htonl((u_int32_t)(x))) 122 #else 123 #define __IPADDR(x) ((u_int32_t)(x)) 124 #endif 125 126 #define IN_CLASSA(i) (((u_int32_t)(i) & __IPADDR(0x80000000)) == \ 127 __IPADDR(0x00000000)) 128 #define IN_CLASSA_NET __IPADDR(0xff000000) 129 #define IN_CLASSA_NSHIFT 24 130 #define IN_CLASSA_HOST __IPADDR(0x00ffffff) 131 #define IN_CLASSA_MAX 128 132 133 #define IN_CLASSB(i) (((u_int32_t)(i) & __IPADDR(0xc0000000)) == \ 134 __IPADDR(0x80000000)) 135 #define IN_CLASSB_NET __IPADDR(0xffff0000) 136 #define IN_CLASSB_NSHIFT 16 137 #define IN_CLASSB_HOST __IPADDR(0x0000ffff) 138 #define IN_CLASSB_MAX 65536 139 140 #define IN_CLASSC(i) (((u_int32_t)(i) & __IPADDR(0xe0000000)) == \ 141 __IPADDR(0xc0000000)) 142 #define IN_CLASSC_NET __IPADDR(0xffffff00) 143 #define IN_CLASSC_NSHIFT 8 144 #define IN_CLASSC_HOST __IPADDR(0x000000ff) 145 146 #define IN_CLASSD(i) (((u_int32_t)(i) & __IPADDR(0xf0000000)) == \ 147 __IPADDR(0xe0000000)) 148 /* These ones aren't really net and host fields, but routing needn't know. */ 149 #define IN_CLASSD_NET __IPADDR(0xf0000000) 150 #define IN_CLASSD_NSHIFT 28 151 #define IN_CLASSD_HOST __IPADDR(0x0fffffff) 152 #define IN_MULTICAST(i) IN_CLASSD(i) 153 154 #define IN_EXPERIMENTAL(i) (((u_int32_t)(i) & __IPADDR(0xf0000000)) == \ 155 __IPADDR(0xf0000000)) 156 #define IN_BADCLASS(i) (((u_int32_t)(i) & __IPADDR(0xf0000000)) == \ 157 __IPADDR(0xf0000000)) 158 159 #define IN_LOCAL_GROUP(i) (((u_int32_t)(i) & __IPADDR(0xffffff00)) == \ 160 __IPADDR(0xe0000000)) 161 162 #define INADDR_ANY __IPADDR(0x00000000) 163 #define INADDR_LOOPBACK __IPADDR(0x7f000001) 164 #define INADDR_BROADCAST __IPADDR(0xffffffff) /* must be masked */ 165 #ifndef _KERNEL 166 #define INADDR_NONE __IPADDR(0xffffffff) /* -1 return */ 167 #endif 168 169 #define INADDR_UNSPEC_GROUP __IPADDR(0xe0000000) /* 224.0.0.0 */ 170 #define INADDR_ALLHOSTS_GROUP __IPADDR(0xe0000001) /* 224.0.0.1 */ 171 #define INADDR_ALLRTRS_GROUP __IPADDR(0xe0000002) /* 224.0.0.2 */ 172 #define INADDR_MAX_LOCAL_GROUP __IPADDR(0xe00000ff) /* 224.0.0.255 */ 173 174 #define IN_LOOPBACKNET 127 /* official! */ 175 176 /* 177 * Socket address, internet style. 178 */ 179 struct sockaddr_in { 180 u_int8_t sin_len; 181 u_int8_t sin_family; 182 u_int16_t sin_port; 183 struct in_addr sin_addr; 184 int8_t sin_zero[8]; 185 }; 186 187 /* 188 * Structure used to describe IP options. 189 * Used to store options internally, to pass them to a process, 190 * or to restore options retrieved earlier. 191 * The ip_dst is used for the first-hop gateway when using a source route 192 * (this gets put into the header proper). 193 */ 194 struct ip_opts { 195 struct in_addr ip_dst; /* first hop, 0 w/o src rt */ 196 int8_t ip_opts[40]; /* actually variable in size */ 197 }; 198 199 /* 200 * Options for use with [gs]etsockopt at the IP level. 201 * First word of comment is data type; bool is stored in int. 202 */ 203 #define IP_OPTIONS 1 /* buf/ip_opts; set/get IP options */ 204 #define IP_HDRINCL 2 /* int; header is included with data */ 205 #define IP_TOS 3 /* int; IP type of service and preced. */ 206 #define IP_TTL 4 /* int; IP time to live */ 207 #define IP_RECVOPTS 5 /* bool; receive all IP opts w/dgram */ 208 #define IP_RECVRETOPTS 6 /* bool; receive IP opts for response */ 209 #define IP_RECVDSTADDR 7 /* bool; receive IP dst addr w/dgram */ 210 #define IP_RETOPTS 8 /* ip_opts; set/get IP options */ 211 #define IP_MULTICAST_IF 9 /* in_addr; set/get IP multicast i/f */ 212 #define IP_MULTICAST_TTL 10 /* u_char; set/get IP multicast ttl */ 213 #define IP_MULTICAST_LOOP 11 /* u_char; set/get IP multicast loopback */ 214 #define IP_ADD_MEMBERSHIP 12 /* ip_mreq; add an IP group membership */ 215 #define IP_DROP_MEMBERSHIP 13 /* ip_mreq; drop an IP group membership */ 216 #define IP_PORTRANGE 19 /* int; range to use for ephemeral port */ 217 #define IP_RECVIF 20 /* bool; receive reception if w/dgram */ 218 #define IP_ERRORMTU 21 /* int; get MTU of last xmit = EMSGSIZE */ 219 220 /* 221 * Defaults and limits for options 222 */ 223 #define IP_DEFAULT_MULTICAST_TTL 1 /* normally limit m'casts to 1 hop */ 224 #define IP_DEFAULT_MULTICAST_LOOP 1 /* normally hear sends if a member */ 225 #define IP_MAX_MEMBERSHIPS 20 /* per socket; must fit in one mbuf */ 226 227 /* 228 * Argument structure for IP_ADD_MEMBERSHIP and IP_DROP_MEMBERSHIP. 229 */ 230 struct ip_mreq { 231 struct in_addr imr_multiaddr; /* IP multicast address of group */ 232 struct in_addr imr_interface; /* local IP address of interface */ 233 }; 234 235 /* 236 * Argument for IP_PORTRANGE: 237 * - which range to search when port is unspecified at bind() or connect() 238 */ 239 #define IP_PORTRANGE_DEFAULT 0 /* default range */ 240 #define IP_PORTRANGE_HIGH 1 /* same as DEFAULT (FreeBSD compat) */ 241 #define IP_PORTRANGE_LOW 2 /* use privileged range */ 242 243 #if !defined(_XOPEN_SOURCE) 244 /* 245 * Definitions for inet sysctl operations. 246 * 247 * Third level is protocol number. 248 * Fourth level is desired variable within that protocol. 249 */ 250 #define IPPROTO_MAXID (IPPROTO_IDP + 1) /* don't list to IPPROTO_MAX */ 251 252 #define CTL_IPPROTO_NAMES { \ 253 { "ip", CTLTYPE_NODE }, \ 254 { "icmp", CTLTYPE_NODE }, \ 255 { "igmp", CTLTYPE_NODE }, \ 256 { "ggp", CTLTYPE_NODE }, \ 257 { 0, 0 }, \ 258 { 0, 0 }, \ 259 { "tcp", CTLTYPE_NODE }, \ 260 { 0, 0 }, \ 261 { "egp", CTLTYPE_NODE }, \ 262 { 0, 0 }, \ 263 { 0, 0 }, \ 264 { 0, 0 }, \ 265 { "pup", CTLTYPE_NODE }, \ 266 { 0, 0 }, \ 267 { 0, 0 }, \ 268 { 0, 0 }, \ 269 { 0, 0 }, \ 270 { "udp", CTLTYPE_NODE }, \ 271 { 0, 0 }, \ 272 { 0, 0 }, \ 273 { 0, 0 }, \ 274 { 0, 0 }, \ 275 { "idp", CTLTYPE_NODE }, \ 276 } 277 278 /* 279 * Names for IP sysctl objects 280 */ 281 #define IPCTL_FORWARDING 1 /* act as router */ 282 #define IPCTL_SENDREDIRECTS 2 /* may send redirects when forwarding */ 283 #define IPCTL_DEFTTL 3 /* default TTL */ 284 #ifdef notyet 285 #define IPCTL_DEFMTU 4 /* default MTU */ 286 #endif 287 #define IPCTL_FORWSRCRT 5 /* forward source-routed packets */ 288 #define IPCTL_DIRECTEDBCAST 6 /* default broadcast behavior */ 289 #define IPCTL_ALLOWSRCRT 7 /* allow/drop all source-routed pkts */ 290 #define IPCTL_SUBNETSARELOCAL 8 /* treat subnets as local addresses */ 291 #define IPCTL_MTUDISC 9 /* allow path MTU discovery */ 292 #define IPCTL_ANONPORTMIN 10 /* minimum ephemeral port */ 293 #define IPCTL_ANONPORTMAX 11 /* maximum ephemeral port */ 294 #define IPCTL_MTUDISCTIMEOUT 12 /* allow path MTU discovery */ 295 #define IPCTL_MAXFLOWS 13 /* maximum ip flows allowed */ 296 #define IPCTL_MAXID 14 297 298 #define IPCTL_NAMES { \ 299 { 0, 0 }, \ 300 { "forwarding", CTLTYPE_INT }, \ 301 { "redirect", CTLTYPE_INT }, \ 302 { "ttl", CTLTYPE_INT }, \ 303 { "mtu", CTLTYPE_INT }, \ 304 { "forwsrcrt", CTLTYPE_INT }, \ 305 { "directed-broadcast", CTLTYPE_INT }, \ 306 { "allowsrcrt", CTLTYPE_INT }, \ 307 { "subnetsarelocal", CTLTYPE_INT }, \ 308 { "mtudisc", CTLTYPE_INT }, \ 309 { "anonportmin", CTLTYPE_INT }, \ 310 { "anonportmax", CTLTYPE_INT }, \ 311 { "mtudisctimeout", CTLTYPE_INT }, \ 312 { "maxflows", CTLTYPE_INT }, \ 313 } 314 #endif /* !_XOPEN_SOURCE */ 315 316 317 #ifdef _KERNEL 318 extern struct in_addr zeroin_addr; 319 320 int in_broadcast __P((struct in_addr, struct ifnet *)); 321 int in_canforward __P((struct in_addr)); 322 int in_cksum __P((struct mbuf *, int)); 323 int in_localaddr __P((struct in_addr)); 324 void in_socktrim __P((struct sockaddr_in *)); 325 326 #define in_hosteq(s,t) ((s).s_addr == (t).s_addr) 327 #define in_nullhost(x) ((x).s_addr == INADDR_ANY) 328 329 #define satosin(sa) ((struct sockaddr_in *)(sa)) 330 #define sintosa(sin) ((struct sockaddr *)(sin)) 331 #define ifatoia(ifa) ((struct in_ifaddr *)(ifa)) 332 #endif /* _KERNEL */ 333 334 #endif /* !_NETINET_IN_H_ */ 335
Indexes created Tue Sep 23 14:10:03 GMT 2025