if_inarp.h revision 1.8
1 /* 2 * Copyright (c) 1982, 1986 Regents of the University of California. 3 * 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 * from: @(#)if_ether.h 7.5 (Berkeley) 6/28/90 34 * $Id: if_inarp.h,v 1.8 1994/02/02 05:58:54 hpeyerl Exp $ 35 */ 36 37 #ifndef _NETINET_IF_ETHER_H_ 38 #define _NETINET_IF_ETHER_H_ 39 40 /* 41 * Ethernet address - 6 octets 42 * this is only used by the ethers(3) functions. 43 */ 44 struct ether_addr { 45 u_char ether_addr_octet[6]; 46 }; 47 48 /* 49 * Structure of a 10Mb/s Ethernet header. 50 */ 51 struct ether_header { 52 u_char ether_dhost[6]; 53 u_char ether_shost[6]; 54 u_short ether_type; 55 }; 56 57 #define ETHERTYPE_PUP 0x0200 /* PUP protocol */ 58 #define ETHERTYPE_IP 0x0800 /* IP protocol */ 59 #define ETHERTYPE_ARP 0x0806 /* address resolution protocol */ 60 #define ETHERTYPE_REVARP 0x8035 /* reverse addr resolution protocol */ 61 62 /* 63 * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have 64 * (type-ETHERTYPE_TRAIL)*512 bytes of data followed 65 * by an ETHER type (as given above) and then the (variable-length) header. 66 */ 67 #define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */ 68 #define ETHERTYPE_NTRAILER 16 69 70 #define ETHERMTU 1500 71 #define ETHERMIN (60-14) 72 73 #ifdef KERNEL 74 /* 75 * Macro to map an IP multicast address to an Ethernet multicast address. 76 * The high-order 25 bits of the Ethernet address are statically assigned, 77 * and the low-order 23 bits are taken from the low end of the IP address. 78 */ 79 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \ 80 /* struct in_addr *ipaddr; */ \ 81 /* u_char enaddr[6]; */ \ 82 { \ 83 (enaddr)[0] = 0x01; \ 84 (enaddr)[1] = 0x00; \ 85 (enaddr)[2] = 0x5e; \ 86 (enaddr)[3] = ((u_char *)ipaddr)[1] & 0x7f; \ 87 (enaddr)[4] = ((u_char *)ipaddr)[2]; \ 88 (enaddr)[5] = ((u_char *)ipaddr)[3]; \ 89 } 90 #endif 91 92 93 /* 94 * Ethernet Address Resolution Protocol. 95 * 96 * See RFC 826 for protocol description. Structure below is adapted 97 * to resolving internet addresses. Field names used correspond to 98 * RFC 826. 99 */ 100 struct ether_arp { 101 struct arphdr ea_hdr; /* fixed-size header */ 102 u_char arp_sha[6]; /* sender hardware address */ 103 u_char arp_spa[4]; /* sender protocol address */ 104 u_char arp_tha[6]; /* target hardware address */ 105 u_char arp_tpa[4]; /* target protocol address */ 106 }; 107 #define arp_hrd ea_hdr.ar_hrd 108 #define arp_pro ea_hdr.ar_pro 109 #define arp_hln ea_hdr.ar_hln 110 #define arp_pln ea_hdr.ar_pln 111 #define arp_op ea_hdr.ar_op 112 113 114 /* 115 * Structure shared between the ethernet driver modules and 116 * the address resolution code. For example, each ec_softc or il_softc 117 * begins with this structure. 118 */ 119 struct arpcom { 120 struct ifnet ac_if; /* network-visible interface */ 121 u_char ac_enaddr[6]; /* ethernet hardware address */ 122 struct in_addr ac_ipaddr; /* copy of ip address- XXX */ 123 struct ether_multi *ac_multiaddrs; /* list of ether multicast addrs */ 124 int ac_multicnt; /* length of ac_multiaddrs list */ 125 }; 126 127 /* 128 * Internet to ethernet address resolution table. 129 */ 130 struct arptab { 131 struct in_addr at_iaddr; /* internet address */ 132 u_char at_enaddr[6]; /* ethernet address */ 133 u_char at_timer; /* minutes since last reference */ 134 u_char at_flags; /* flags */ 135 struct mbuf *at_hold; /* last packet until resolved/timeout */ 136 }; 137 138 #ifdef KERNEL 139 u_char etherbroadcastaddr[6]; 140 u_char ether_ipmulticast_min[6]; 141 u_char ether_ipmulticast_max[6]; 142 struct arptab *arptnew(); 143 int ether_output(), ether_input(); 144 char *ether_sprintf(); 145 146 /* 147 * Ethernet multicast address structure. There is one of these for each 148 * multicast address or range of multicast addresses that we are supposed 149 * to listen to on a particular interface. They are kept in a linked list, 150 * rooted in the interface's arpcom structure. (This really has nothing to 151 * do with ARP, or with the Internet address family, but this appears to be 152 * the minimally-disrupting place to put it.) 153 */ 154 struct ether_multi { 155 u_char enm_addrlo[6]; /* low or only address of range */ 156 u_char enm_addrhi[6]; /* high or only address of range */ 157 struct arpcom *enm_ac; /* back pointer to arpcom */ 158 u_int enm_refcount; /* no. claims to this addr/range */ 159 struct ether_multi *enm_next; /* ptr to next ether_multi */ 160 }; 161 162 /* 163 * Structure used by macros below to remember position when stepping through 164 * all of the ether_multi records. 165 */ 166 struct ether_multistep { 167 struct ether_multi *e_enm; 168 }; 169 170 /* 171 * Macro for looking up the ether_multi record for a given range of Ethernet 172 * multicast addresses connected to a given arpcom structure. If no matching 173 * record is found, "enm" returns NULL. 174 */ 175 #define ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm) \ 176 /* u_char addrlo[6]; */ \ 177 /* u_char addrhi[6]; */ \ 178 /* struct arpcom *ac; */ \ 179 /* struct ether_multi *enm; */ \ 180 { \ 181 for ((enm) = (ac)->ac_multiaddrs; \ 182 (enm) != NULL && \ 183 (bcmp((enm)->enm_addrlo, (addrlo), 6) != 0 || \ 184 bcmp((enm)->enm_addrhi, (addrhi), 6) != 0); \ 185 (enm) = (enm)->enm_next); \ 186 } 187 188 /* 189 * Macro to step through all of the ether_multi records, one at a time. 190 * The current position is remembered in "step", which the caller must 191 * provide. ETHER_FIRST_MULTI(), below, must be called to initialize "step" 192 * and get the first record. Both macros return a NULL "enm" when there 193 * are no remaining records. 194 */ 195 #define ETHER_NEXT_MULTI(step, enm) \ 196 /* struct ether_multistep step; */ \ 197 /* struct ether_multi *enm; */ \ 198 { \ 199 if (((enm) = (step).e_enm) != NULL) \ 200 (step).e_enm = (enm)->enm_next; \ 201 } 202 203 #define ETHER_FIRST_MULTI(step, ac, enm) \ 204 /* struct ether_multistep step; */ \ 205 /* struct arpcom *ac; */ \ 206 /* struct ether_multi *enm; */ \ 207 { \ 208 (step).e_enm = (ac)->ac_multiaddrs; \ 209 ETHER_NEXT_MULTI((step), (enm)); \ 210 } 211 #endif 212 213 #endif /* !_NETINET_IF_ETHER_H_ */ 214
Indexes created Thu Oct 02 14:10:14 GMT 2025