1 /* 2 * Copyright (c) 1982, 1986, 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)in.h 8.3 (Berkeley) 01/03/94 8 */ 9 10 /* 11 * Constants and structures defined by the internet system, 12 * Per RFC 790, September 1981, and numerous additions. 13 */ 14 15 /* 16 * Protocols 17 */ 18 #define IPPROTO_IP 0 /* dummy for IP */ 19 #define IPPROTO_ICMP 1 /* control message protocol */ 20 #define IPPROTO_IGMP 2 /* group mgmt protocol */ 21 #define IPPROTO_GGP 3 /* gateway^2 (deprecated) */ 22 #define IPPROTO_TCP 6 /* tcp */ 23 #define IPPROTO_EGP 8 /* exterior gateway protocol */ 24 #define IPPROTO_PUP 12 /* pup */ 25 #define IPPROTO_UDP 17 /* user datagram protocol */ 26 #define IPPROTO_IDP 22 /* xns idp */ 27 #define IPPROTO_TP 29 /* tp-4 w/ class negotiation */ 28 #define IPPROTO_EON 80 /* ISO cnlp */ 29 #define IPPROTO_ENCAP 98 /* encapsulation header */ 30 31 #define IPPROTO_RAW 255 /* raw IP packet */ 32 #define IPPROTO_MAX 256 33 34 35 /* 36 * Local port number conventions: 37 * Ports < IPPORT_RESERVED are reserved for 38 * privileged processes (e.g. root). 39 * Ports > IPPORT_USERRESERVED are reserved 40 * for servers, not necessarily privileged. 41 */ 42 #define IPPORT_RESERVED 1024 43 #define IPPORT_USERRESERVED 5000 44 45 /* 46 * Internet address (a structure for historical reasons) 47 */ 48 struct in_addr { 49 u_long s_addr; 50 }; 51 52 /* 53 * Definitions of bits in internet address integers. 54 * On subnets, the decomposition of addresses to host and net parts 55 * is done according to subnet mask, not the masks here. 56 */ 57 #define IN_CLASSA(i) (((long)(i) & 0x80000000) == 0) 58 #define IN_CLASSA_NET 0xff000000 59 #define IN_CLASSA_NSHIFT 24 60 #define IN_CLASSA_HOST 0x00ffffff 61 #define IN_CLASSA_MAX 128 62 63 #define IN_CLASSB(i) (((long)(i) & 0xc0000000) == 0x80000000) 64 #define IN_CLASSB_NET 0xffff0000 65 #define IN_CLASSB_NSHIFT 16 66 #define IN_CLASSB_HOST 0x0000ffff 67 #define IN_CLASSB_MAX 65536 68 69 #define IN_CLASSC(i) (((long)(i) & 0xe0000000) == 0xc0000000) 70 #define IN_CLASSC_NET 0xffffff00 71 #define IN_CLASSC_NSHIFT 8 72 #define IN_CLASSC_HOST 0x000000ff 73 74 #define IN_CLASSD(i) (((long)(i) & 0xf0000000) == 0xe0000000) 75 #define IN_CLASSD_NET 0xf0000000 /* These ones aren't really */ 76 #define IN_CLASSD_NSHIFT 28 /* net and host fields, but */ 77 #define IN_CLASSD_HOST 0x0fffffff /* routing needn't know. */ 78 #define IN_MULTICAST(i) IN_CLASSD(i) 79 80 #define IN_EXPERIMENTAL(i) (((long)(i) & 0xf0000000) == 0xf0000000) 81 #define IN_BADCLASS(i) (((long)(i) & 0xf0000000) == 0xf0000000) 82 83 #define INADDR_ANY (u_long)0x00000000 84 #define INADDR_BROADCAST (u_long)0xffffffff /* must be masked */ 85 #ifndef KERNEL 86 #define INADDR_NONE 0xffffffff /* -1 return */ 87 #endif 88 89 #define INADDR_UNSPEC_GROUP (u_long)0xe0000000 /* 224.0.0.0 */ 90 #define INADDR_ALLHOSTS_GROUP (u_long)0xe0000001 /* 224.0.0.1 */ 91 #define INADDR_MAX_LOCAL_GROUP (u_long)0xe00000ff /* 224.0.0.255 */ 92 93 #define IN_LOOPBACKNET 127 /* official! */ 94 95 /* 96 * Socket address, internet style. 97 */ 98 struct sockaddr_in { 99 u_char sin_len; 100 u_char sin_family; 101 u_short sin_port; 102 struct in_addr sin_addr; 103 char sin_zero[8]; 104 }; 105 106 /* 107 * Structure used to describe IP options. 108 * Used to store options internally, to pass them to a process, 109 * or to restore options retrieved earlier. 110 * The ip_dst is used for the first-hop gateway when using a source route 111 * (this gets put into the header proper). 112 */ 113 struct ip_opts { 114 struct in_addr ip_dst; /* first hop, 0 w/o src rt */ 115 char ip_opts[40]; /* actually variable in size */ 116 }; 117 118 /* 119 * Options for use with [gs]etsockopt at the IP level. 120 * First word of comment is data type; bool is stored in int. 121 */ 122 #define IP_OPTIONS 1 /* buf/ip_opts; set/get IP options */ 123 #define IP_HDRINCL 2 /* int; header is included with data */ 124 #define IP_TOS 3 /* int; IP type of service and preced. */ 125 #define IP_TTL 4 /* int; IP time to live */ 126 #define IP_RECVOPTS 5 /* bool; receive all IP opts w/dgram */ 127 #define IP_RECVRETOPTS 6 /* bool; receive IP opts for response */ 128 #define IP_RECVDSTADDR 7 /* bool; receive IP dst addr w/dgram */ 129 #define IP_RETOPTS 8 /* ip_opts; set/get IP options */ 130 #define IP_MULTICAST_IF 9 /* u_char; set/get IP multicast i/f */ 131 #define IP_MULTICAST_TTL 10 /* u_char; set/get IP multicast ttl */ 132 #define IP_MULTICAST_LOOP 11 /* u_char; set/get IP multicast loopback */ 133 #define IP_ADD_MEMBERSHIP 12 /* ip_mreq; add an IP group membership */ 134 #define IP_DROP_MEMBERSHIP 13 /* ip_mreq; drop an IP group membership */ 135 136 /* 137 * Defaults and limits for options 138 */ 139 #define IP_DEFAULT_MULTICAST_TTL 1 /* normally limit m'casts to 1 hop */ 140 #define IP_DEFAULT_MULTICAST_LOOP 1 /* normally hear sends if a member */ 141 #define IP_MAX_MEMBERSHIPS 20 /* per socket; must fit in one mbuf */ 142 143 /* 144 * Argument structure for IP_ADD_MEMBERSHIP and IP_DROP_MEMBERSHIP. 145 */ 146 struct ip_mreq { 147 struct in_addr imr_multiaddr; /* IP multicast address of group */ 148 struct in_addr imr_interface; /* local IP address of interface */ 149 }; 150 151 /* 152 * Definitions for inet sysctl operations. 153 * 154 * Third level is protocol number. 155 * Fourth level is desired variable within that protocol. 156 */ 157 #define IPPROTO_MAXID (IPPROTO_IDP + 1) /* don't list to IPPROTO_MAX */ 158 159 #define CTL_IPPROTO_NAMES { \ 160 { "ip", CTLTYPE_NODE }, \ 161 { "icmp", CTLTYPE_NODE }, \ 162 { "igmp", CTLTYPE_NODE }, \ 163 { "ggp", CTLTYPE_NODE }, \ 164 { 0, 0 }, \ 165 { 0, 0 }, \ 166 { "tcp", CTLTYPE_NODE }, \ 167 { 0, 0 }, \ 168 { "egp", CTLTYPE_NODE }, \ 169 { 0, 0 }, \ 170 { 0, 0 }, \ 171 { 0, 0 }, \ 172 { "pup", CTLTYPE_NODE }, \ 173 { 0, 0 }, \ 174 { 0, 0 }, \ 175 { 0, 0 }, \ 176 { 0, 0 }, \ 177 { "udp", CTLTYPE_NODE }, \ 178 { 0, 0 }, \ 179 { 0, 0 }, \ 180 { 0, 0 }, \ 181 { 0, 0 }, \ 182 { "idp", CTLTYPE_NODE }, \ 183 } 184 185 /* 186 * Names for IP sysctl objects 187 */ 188 #define IPCTL_FORWARDING 1 /* act as router */ 189 #define IPCTL_SENDREDIRECTS 2 /* may send redirects when forwarding */ 190 #define IPCTL_DEFTTL 3 /* default TTL */ 191 #ifdef notyet 192 #define IPCTL_DEFMTU 4 /* default MTU */ 193 #endif 194 #define IPCTL_MAXID 5 195 196 #define IPCTL_NAMES { \ 197 { 0, 0 }, \ 198 { "forwarding", CTLTYPE_INT }, \ 199 { "redirect", CTLTYPE_INT }, \ 200 { "ttl", CTLTYPE_INT }, \ 201 { "mtu", CTLTYPE_INT }, \ 202 } 203 204 205 #ifdef KERNEL 206 int in_broadcast __P((struct in_addr, struct ifnet *)); 207 int in_canforward __P((struct in_addr)); 208 int in_cksum __P((struct mbuf *, int)); 209 int in_localaddr __P((struct in_addr)); 210 u_long in_netof __P((struct in_addr)); 211 void in_socktrim __P((struct sockaddr_in *)); 212 #endif 213