in.h revision 15026
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 * $Id: in.h,v 1.16 1996/03/14 16:59:18 fenner Exp $ 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 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_EGP 8 /* exterior gateway protocol */ 55#define IPPROTO_PUP 12 /* pup */ 56#define IPPROTO_UDP 17 /* user datagram protocol */ 57#define IPPROTO_IDP 22 /* xns idp */ 58#define IPPROTO_TP 29 /* tp-4 w/ class negotiation */ 59#define IPPROTO_RSVP 46 /* resource reservation */ 60#define IPPROTO_EON 80 /* ISO cnlp */ 61#define IPPROTO_ENCAP 98 /* encapsulation header */ 62 63#define IPPROTO_RAW 255 /* raw IP packet */ 64#define IPPROTO_MAX 256 65 66 67/* 68 * Local port number conventions: 69 * 70 * When a user does a bind(2) or connect(2) with a port number of zero, 71 * a non-conflicting local port address is chosen. 72 * The default range is IPPORT_RESERVED through 73 * IPPORT_USERRESERVED, although that is settable by sysctl. 74 * 75 * A user may set the IPPROTO_IP option IP_PORTRANGE to change this 76 * default assignment range. 77 * 78 * The value IP_PORTRANGE_DEFAULT causes the default behavior. 79 * 80 * The value IP_PORTRANGE_HIGH changes the range of candidate port numbers 81 * into the "high" range. These are reserved for client outbound connections 82 * which do not want to be filtered by any firewalls. 83 * 84 * The value IP_PORTRANGE_LOW changes the range to the "low" are 85 * that is (by convention) restricted to privileged processes. This 86 * convention is based on "vouchsafe" principles only. It is only secure 87 * if you trust the remote host to restrict these ports. 88 * 89 * The default range of ports and the high range can be changed by 90 * sysctl(3). (net.inet.ip.port{hi}{first,last}_auto) 91 * 92 * Changing those values has bad security implications if you are 93 * using a a stateless firewall that is allowing packets outside of that 94 * range in order to allow transparent outgoing connections. 95 * 96 * Such a firewall configuration will generally depend on the use of these 97 * default values. If you change them, you may find your Security 98 * Administrator looking for you with a heavy object. 99 */ 100 101/* 102 * Ports < IPPORT_RESERVED are reserved for 103 * privileged processes (e.g. root). (IP_PORTRANGE_LOW) 104 * Ports > IPPORT_USERRESERVED are reserved 105 * for servers, not necessarily privileged. (IP_PORTRANGE_DEFAULT) 106 */ 107#define IPPORT_RESERVED 1024 108#define IPPORT_USERRESERVED 5000 109 110/* 111 * Default local port range to use by setting IP_PORTRANGE_HIGH 112 */ 113#define IPPORT_HIFIRSTAUTO 40000 114#define IPPORT_HILASTAUTO 44999 115 116/* 117 * Internet address (a structure for historical reasons) 118 */ 119struct in_addr { 120 u_long s_addr; 121}; 122 123/* 124 * Definitions of bits in internet address integers. 125 * On subnets, the decomposition of addresses to host and net parts 126 * is done according to subnet mask, not the masks here. 127 */ 128#define IN_CLASSA(i) (((long)(i) & 0x80000000) == 0) 129#define IN_CLASSA_NET 0xff000000 130#define IN_CLASSA_NSHIFT 24 131#define IN_CLASSA_HOST 0x00ffffff 132#define IN_CLASSA_MAX 128 133 134#define IN_CLASSB(i) (((long)(i) & 0xc0000000) == 0x80000000) 135#define IN_CLASSB_NET 0xffff0000 136#define IN_CLASSB_NSHIFT 16 137#define IN_CLASSB_HOST 0x0000ffff 138#define IN_CLASSB_MAX 65536 139 140#define IN_CLASSC(i) (((long)(i) & 0xe0000000) == 0xc0000000) 141#define IN_CLASSC_NET 0xffffff00 142#define IN_CLASSC_NSHIFT 8 143#define IN_CLASSC_HOST 0x000000ff 144 145#define IN_CLASSD(i) (((long)(i) & 0xf0000000) == 0xe0000000) 146#define IN_CLASSD_NET 0xf0000000 /* These ones aren't really */ 147#define IN_CLASSD_NSHIFT 28 /* net and host fields, but */ 148#define IN_CLASSD_HOST 0x0fffffff /* routing needn't know. */ 149#define IN_MULTICAST(i) IN_CLASSD(i) 150 151#define IN_EXPERIMENTAL(i) (((long)(i) & 0xf0000000) == 0xf0000000) 152#define IN_BADCLASS(i) (((long)(i) & 0xf0000000) == 0xf0000000) 153 154#define INADDR_ANY (u_long)0x00000000 155#define INADDR_BROADCAST (u_long)0xffffffff /* must be masked */ 156#ifndef KERNEL 157#define INADDR_NONE 0xffffffff /* -1 return */ 158#endif 159 160#define INADDR_UNSPEC_GROUP (u_long)0xe0000000 /* 224.0.0.0 */ 161#define INADDR_ALLHOSTS_GROUP (u_long)0xe0000001 /* 224.0.0.1 */ 162#define INADDR_ALLRTRS_GROUP (u_long)0xe0000002 /* 224.0.0.2 */ 163#define INADDR_MAX_LOCAL_GROUP (u_long)0xe00000ff /* 224.0.0.255 */ 164 165#define IN_LOOPBACKNET 127 /* official! */ 166 167/* 168 * Socket address, internet style. 169 */ 170struct sockaddr_in { 171 u_char sin_len; 172 u_char sin_family; 173 u_short sin_port; 174 struct in_addr sin_addr; 175 char sin_zero[8]; 176}; 177 178/* 179 * Structure used to describe IP options. 180 * Used to store options internally, to pass them to a process, 181 * or to restore options retrieved earlier. 182 * The ip_dst is used for the first-hop gateway when using a source route 183 * (this gets put into the header proper). 184 */ 185struct ip_opts { 186 struct in_addr ip_dst; /* first hop, 0 w/o src rt */ 187 char ip_opts[40]; /* actually variable in size */ 188}; 189 190/* 191 * Options for use with [gs]etsockopt at the IP level. 192 * First word of comment is data type; bool is stored in int. 193 */ 194#define IP_OPTIONS 1 /* buf/ip_opts; set/get IP options */ 195#define IP_HDRINCL 2 /* int; header is included with data */ 196#define IP_TOS 3 /* int; IP type of service and preced. */ 197#define IP_TTL 4 /* int; IP time to live */ 198#define IP_RECVOPTS 5 /* bool; receive all IP opts w/dgram */ 199#define IP_RECVRETOPTS 6 /* bool; receive IP opts for response */ 200#define IP_RECVDSTADDR 7 /* bool; receive IP dst addr w/dgram */ 201#define IP_RETOPTS 8 /* ip_opts; set/get IP options */ 202#define IP_MULTICAST_IF 9 /* u_char; set/get IP multicast i/f */ 203#define IP_MULTICAST_TTL 10 /* u_char; set/get IP multicast ttl */ 204#define IP_MULTICAST_LOOP 11 /* u_char; set/get IP multicast loopback */ 205#define IP_ADD_MEMBERSHIP 12 /* ip_mreq; add an IP group membership */ 206#define IP_DROP_MEMBERSHIP 13 /* ip_mreq; drop an IP group membership */ 207#define IP_MULTICAST_VIF 14 /* set/get IP mcast virt. iface */ 208#define IP_RSVP_ON 15 /* enable RSVP in kernel */ 209#define IP_RSVP_OFF 16 /* disable RSVP in kernel */ 210#define IP_RSVP_VIF_ON 17 /* set RSVP per-vif socket */ 211#define IP_RSVP_VIF_OFF 18 /* unset RSVP per-vif socket */ 212#define IP_PORTRANGE 19 /* int; range to choose for unspec port */ 213 214/* 215 * Defaults and limits for options 216 */ 217#define IP_DEFAULT_MULTICAST_TTL 1 /* normally limit m'casts to 1 hop */ 218#define IP_DEFAULT_MULTICAST_LOOP 1 /* normally hear sends if a member */ 219#define IP_MAX_MEMBERSHIPS 20 /* per socket */ 220 221/* 222 * Argument structure for IP_ADD_MEMBERSHIP and IP_DROP_MEMBERSHIP. 223 */ 224struct ip_mreq { 225 struct in_addr imr_multiaddr; /* IP multicast address of group */ 226 struct in_addr imr_interface; /* local IP address of interface */ 227}; 228 229/* 230 * Argument for IP_PORTRANGE: 231 * - which range to search when port is unspecified at bind() or connect() 232 */ 233#define IP_PORTRANGE_DEFAULT 0 /* default range */ 234#define IP_PORTRANGE_HIGH 1 /* "high" - request firewall bypass */ 235#define IP_PORTRANGE_LOW 2 /* "low" - vouchsafe security */ 236 237/* 238 * Definitions for inet sysctl operations. 239 * 240 * Third level is protocol number. 241 * Fourth level is desired variable within that protocol. 242 */ 243#define IPPROTO_MAXID (IPPROTO_IDP + 1) /* don't list to IPPROTO_MAX */ 244 245#define CTL_IPPROTO_NAMES { \ 246 { "ip", CTLTYPE_NODE }, \ 247 { "icmp", CTLTYPE_NODE }, \ 248 { "igmp", CTLTYPE_NODE }, \ 249 { "ggp", CTLTYPE_NODE }, \ 250 { 0, 0 }, \ 251 { 0, 0 }, \ 252 { "tcp", CTLTYPE_NODE }, \ 253 { 0, 0 }, \ 254 { "egp", CTLTYPE_NODE }, \ 255 { 0, 0 }, \ 256 { 0, 0 }, \ 257 { 0, 0 }, \ 258 { "pup", CTLTYPE_NODE }, \ 259 { 0, 0 }, \ 260 { 0, 0 }, \ 261 { 0, 0 }, \ 262 { 0, 0 }, \ 263 { "udp", CTLTYPE_NODE }, \ 264 { 0, 0 }, \ 265 { 0, 0 }, \ 266 { 0, 0 }, \ 267 { 0, 0 }, \ 268 { "idp", CTLTYPE_NODE }, \ 269} 270 271/* 272 * Names for IP sysctl objects 273 */ 274#define IPCTL_FORWARDING 1 /* act as router */ 275#define IPCTL_SENDREDIRECTS 2 /* may send redirects when forwarding */ 276#define IPCTL_DEFTTL 3 /* default TTL */ 277#ifdef notyet 278#define IPCTL_DEFMTU 4 /* default MTU */ 279#endif 280#define IPCTL_RTEXPIRE 5 /* cloned route expiration time */ 281#define IPCTL_RTMINEXPIRE 6 /* min value for expiration time */ 282#define IPCTL_RTMAXCACHE 7 /* trigger level for dynamic expire */ 283#define IPCTL_SOURCEROUTE 8 /* may perform source routes */ 284#define IPCTL_DIRECTEDBROADCAST 9 /* may re-broadcast received packets */ 285#define IPCTL_INTRQMAXLEN 10 /* max length of netisr queue */ 286#define IPCTL_INTRQDROPS 11 /* number of netisr q drops */ 287#define IPCTL_MAXID 12 288 289#define IPCTL_NAMES { \ 290 { 0, 0 }, \ 291 { "forwarding", CTLTYPE_INT }, \ 292 { "redirect", CTLTYPE_INT }, \ 293 { "ttl", CTLTYPE_INT }, \ 294 { "mtu", CTLTYPE_INT }, \ 295 { "rtexpire", CTLTYPE_INT }, \ 296 { "rtminexpire", CTLTYPE_INT }, \ 297 { "rtmaxcache", CTLTYPE_INT }, \ 298 { "sourceroute", CTLTYPE_INT }, \ 299 { "directed-broadcast", CTLTYPE_INT }, \ 300 { "intr-queue-maxlen", CTLTYPE_INT }, \ 301 { "intr-queue-drops", CTLTYPE_INT }, \ 302} 303 304 305#ifdef KERNEL 306struct ifnet; struct mbuf; /* forward declarations for Standard C */ 307 308int in_broadcast __P((struct in_addr, struct ifnet *)); 309int in_canforward __P((struct in_addr)); 310int in_cksum __P((struct mbuf *, int)); 311int in_localaddr __P((struct in_addr)); 312char *inet_ntoa __P((struct in_addr)); /* in libkern */ 313 314/* Firewall hooks */ 315struct ip; 316typedef int ip_fw_chk_t __P((struct ip**, int, struct ifnet*, int, struct mbuf**)); 317typedef int ip_fw_ctl_t __P((int, struct mbuf**)); 318extern ip_fw_chk_t *ip_fw_chk_ptr; 319extern ip_fw_ctl_t *ip_fw_ctl_ptr; 320#endif /* KERNEL */ 321 322#endif 323