if_ether.h revision 1.8
1 /* $NetBSD: if_ether.h,v 1.8 1999/04/09 09:32:51 drochner Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 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 * @(#)if_ether.h 8.1 (Berkeley) 6/10/93 36 */ 37 38 #ifndef _NET_IF_ETHER_H_ 39 #define _NET_IF_ETHER_H_ 40 41 /* 42 * Some basic Ethernet constants. 43 */ 44 #define ETHER_ADDR_LEN 6 /* length of an Ethernet address */ 45 #define ETHER_TYPE_LEN 2 /* length of the Ethernet type field */ 46 #define ETHER_CRC_LEN 4 /* length of the Ethernet CRC */ 47 #define ETHER_HDR_LEN ((ETHER_ADDR_LEN * 2) + ETHER_TYPE_LEN) 48 #define ETHER_MIN_LEN 64 /* minimum frame length, including CRC */ 49 #define ETHER_MAX_LEN 1518 /* maximum frame length, including CRC */ 50 51 /* 52 * Ethernet address - 6 octets 53 * this is only used by the ethers(3) functions. 54 */ 55 struct ether_addr { 56 u_int8_t ether_addr_octet[ETHER_ADDR_LEN]; 57 }; 58 59 /* 60 * Structure of a 10Mb/s Ethernet header. 61 */ 62 struct ether_header { 63 u_int8_t ether_dhost[ETHER_ADDR_LEN]; 64 u_int8_t ether_shost[ETHER_ADDR_LEN]; 65 u_int16_t ether_type; 66 }; 67 68 #include <net/ethertypes.h> 69 70 #define ETHER_IS_MULTICAST(addr) (*(addr) & 0x01) /* is address mcast/bcast? */ 71 72 #define ETHERMTU (ETHER_MAX_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN) 73 #define ETHERMIN (ETHER_MIN_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN) 74 75 #ifndef _STANDALONE 76 77 #ifdef _KERNEL 78 /* 79 * Macro to map an IP multicast address to an Ethernet multicast address. 80 * The high-order 25 bits of the Ethernet address are statically assigned, 81 * and the low-order 23 bits are taken from the low end of the IP address. 82 */ 83 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \ 84 /* struct in_addr *ipaddr; */ \ 85 /* u_int8_t enaddr[ETHER_ADDR_LEN]; */ \ 86 { \ 87 (enaddr)[0] = 0x01; \ 88 (enaddr)[1] = 0x00; \ 89 (enaddr)[2] = 0x5e; \ 90 (enaddr)[3] = ((u_int8_t *)ipaddr)[1] & 0x7f; \ 91 (enaddr)[4] = ((u_int8_t *)ipaddr)[2]; \ 92 (enaddr)[5] = ((u_int8_t *)ipaddr)[3]; \ 93 } 94 #endif 95 96 /* 97 * Structure shared between the ethernet driver modules and 98 * the multicast list code. For example, each ec_softc or il_softc 99 * begins with this structure. 100 */ 101 struct ethercom { 102 struct ifnet ec_if; /* network-visible interface */ 103 LIST_HEAD(, ether_multi) ec_multiaddrs; /* list of ether multicast addrs */ 104 int ec_multicnt; /* length of ac_multiaddrs list */ 105 }; 106 107 #ifdef _KERNEL 108 u_int8_t etherbroadcastaddr[ETHER_ADDR_LEN]; 109 u_int8_t ether_ipmulticast_min[ETHER_ADDR_LEN]; 110 u_int8_t ether_ipmulticast_max[ETHER_ADDR_LEN]; 111 112 int ether_addmulti __P((struct ifreq *, struct ethercom *)); 113 int ether_delmulti __P((struct ifreq *, struct ethercom *)); 114 #endif /* _KERNEL */ 115 116 /* 117 * Ethernet multicast address structure. There is one of these for each 118 * multicast address or range of multicast addresses that we are supposed 119 * to listen to on a particular interface. They are kept in a linked list, 120 * rooted in the interface's ethercom structure. 121 */ 122 struct ether_multi { 123 u_int8_t enm_addrlo[ETHER_ADDR_LEN]; /* low or only address of range */ 124 u_int8_t enm_addrhi[ETHER_ADDR_LEN]; /* high or only address of range */ 125 struct ethercom *enm_ec; /* back pointer to ethercom */ 126 u_int enm_refcount; /* no. claims to this addr/range */ 127 LIST_ENTRY(ether_multi) enm_list; 128 }; 129 130 /* 131 * Structure used by macros below to remember position when stepping through 132 * all of the ether_multi records. 133 */ 134 struct ether_multistep { 135 struct ether_multi *e_enm; 136 }; 137 138 /* 139 * Macro for looking up the ether_multi record for a given range of Ethernet 140 * multicast addresses connected to a given ethercom structure. If no matching 141 * record is found, "enm" returns NULL. 142 */ 143 #define ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm) \ 144 /* u_int8_t addrlo[ETHER_ADDR_LEN]; */ \ 145 /* u_int8_t addrhi[ETHER_ADDR_LEN]; */ \ 146 /* struct ethercom *ec; */ \ 147 /* struct ether_multi *enm; */ \ 148 { \ 149 for ((enm) = (ec)->ec_multiaddrs.lh_first; \ 150 (enm) != NULL && \ 151 (bcmp((enm)->enm_addrlo, (addrlo), ETHER_ADDR_LEN) != 0 || \ 152 bcmp((enm)->enm_addrhi, (addrhi), ETHER_ADDR_LEN) != 0); \ 153 (enm) = (enm)->enm_list.le_next); \ 154 } 155 156 /* 157 * Macro to step through all of the ether_multi records, one at a time. 158 * The current position is remembered in "step", which the caller must 159 * provide. ETHER_FIRST_MULTI(), below, must be called to initialize "step" 160 * and get the first record. Both macros return a NULL "enm" when there 161 * are no remaining records. 162 */ 163 #define ETHER_NEXT_MULTI(step, enm) \ 164 /* struct ether_multistep step; */ \ 165 /* struct ether_multi *enm; */ \ 166 { \ 167 if (((enm) = (step).e_enm) != NULL) \ 168 (step).e_enm = (enm)->enm_list.le_next; \ 169 } 170 171 #define ETHER_FIRST_MULTI(step, ec, enm) \ 172 /* struct ether_multistep step; */ \ 173 /* struct ethercom *ec; */ \ 174 /* struct ether_multi *enm; */ \ 175 { \ 176 (step).e_enm = (ec)->ec_multiaddrs.lh_first; \ 177 ETHER_NEXT_MULTI((step), (enm)); \ 178 } 179 180 /* 181 * Prototype ethers(3) functions. 182 */ 183 #ifndef _KERNEL 184 #include <sys/cdefs.h> 185 __BEGIN_DECLS 186 char * ether_ntoa __P((struct ether_addr *)); 187 struct ether_addr * 188 ether_aton __P((const char *)); 189 int ether_ntohost __P((char *, struct ether_addr *)); 190 int ether_hostton __P((const char *, struct ether_addr *)); 191 int ether_line __P((const char *, struct ether_addr *, char *)); 192 __END_DECLS 193 #endif 194 195 #endif /* _STANDALONE */ 196 197 #endif /* _NET_IF_ETHER_H_ */ 198
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