if_ether.h revision 1.5
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_ether.h,v 1.5 1993/12/13 15:10:40 hpeyerl Exp $ 35 */ 36 37 #ifndef _NETINET_IF_ETHER_H_ 38 #define _NETINET_IF_ETHER_H_ 39 40 /* 41 * Structure of a 10Mb/s Ethernet header. 42 */ 43 struct ether_header { 44 u_char ether_dhost[6]; 45 u_char ether_shost[6]; 46 u_short ether_type; 47 }; 48 49 #define ETHERTYPE_PUP 0x0200 /* PUP protocol */ 50 #define ETHERTYPE_IP 0x0800 /* IP protocol */ 51 #define ETHERTYPE_ARP 0x0806 /* address resolution protocol */ 52 #define ETHERTYPE_REVARP 0x8035 /* reverse addr resolution protocol */ 53 54 /* 55 * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have 56 * (type-ETHERTYPE_TRAIL)*512 bytes of data followed 57 * by an ETHER type (as given above) and then the (variable-length) header. 58 */ 59 #define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */ 60 #define ETHERTYPE_NTRAILER 16 61 62 #define ETHERMTU 1500 63 #define ETHERMIN (60-14) 64 65 #ifdef KERNEL 66 /* 67 * Macro to map an IP multicast address to an Ethernet multicast address. 68 * The high-order 25 bits of the Ethernet address are statically assigned, 69 * and the low-order 23 bits are taken from the low end of the IP address. 70 */ 71 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \ 72 /* struct in_addr *ipaddr; */ \ 73 /* u_char enaddr[6]; */ \ 74 { \ 75 (enaddr)[0] = 0x01; \ 76 (enaddr)[1] = 0x00; \ 77 (enaddr)[2] = 0x5e; \ 78 (enaddr)[3] = ((u_char *)ipaddr)[1] & 0x7f; \ 79 (enaddr)[4] = ((u_char *)ipaddr)[2]; \ 80 (enaddr)[5] = ((u_char *)ipaddr)[3]; \ 81 } 82 #endif 83 84 85 /* 86 * Ethernet Address Resolution Protocol. 87 * 88 * See RFC 826 for protocol description. Structure below is adapted 89 * to resolving internet addresses. Field names used correspond to 90 * RFC 826. 91 */ 92 struct ether_arp { 93 struct arphdr ea_hdr; /* fixed-size header */ 94 u_char arp_sha[6]; /* sender hardware address */ 95 u_char arp_spa[4]; /* sender protocol address */ 96 u_char arp_tha[6]; /* target hardware address */ 97 u_char arp_tpa[4]; /* target protocol address */ 98 }; 99 #define arp_hrd ea_hdr.ar_hrd 100 #define arp_pro ea_hdr.ar_pro 101 #define arp_hln ea_hdr.ar_hln 102 #define arp_pln ea_hdr.ar_pln 103 #define arp_op ea_hdr.ar_op 104 105 106 /* 107 * Structure shared between the ethernet driver modules and 108 * the address resolution code. For example, each ec_softc or il_softc 109 * begins with this structure. 110 */ 111 struct arpcom { 112 struct ifnet ac_if; /* network-visible interface */ 113 u_char ac_enaddr[6]; /* ethernet hardware address */ 114 struct in_addr ac_ipaddr; /* copy of ip address- XXX */ 115 #ifdef MULTICAST 116 struct ether_multi *ac_multiaddrs; /* list of ether multicast addrs */ 117 int ac_multicnt; /* length of ac_multiaddrs list */ 118 #endif 119 }; 120 121 /* 122 * Internet to ethernet address resolution table. 123 */ 124 struct arptab { 125 struct in_addr at_iaddr; /* internet address */ 126 u_char at_enaddr[6]; /* ethernet address */ 127 u_char at_timer; /* minutes since last reference */ 128 u_char at_flags; /* flags */ 129 struct mbuf *at_hold; /* last packet until resolved/timeout */ 130 }; 131 132 #ifdef KERNEL 133 u_char etherbroadcastaddr[6]; 134 #if defined(ISO) && !defined(MULTICAST) 135 #define MULTICAST 1 136 #endif 137 #ifdef MULTICAST 138 u_char ether_ipmulticast_min[6]; 139 u_char ether_ipmulticast_max[6]; 140 #endif 141 struct arptab *arptnew(); 142 int ether_output(), ether_input(); 143 char *ether_sprintf(); 144 145 #ifdef MULTICAST 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 #endif 213 214 #endif /* !_NETINET_IF_ETHER_H_ */ 215
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