if_ether.h revision 1.6
1 /* $NetBSD: if_ether.h,v 1.6 1999/03/25 04:45:37 explorer 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 * Ethernet address - 6 octets 43 * this is only used by the ethers(3) functions. 44 */ 45 struct ether_addr { 46 u_int8_t ether_addr_octet[6]; 47 }; 48 49 /* 50 * Structure of a 10Mb/s Ethernet header. 51 */ 52 #define ETHER_ADDR_LEN 6 53 54 struct ether_header { 55 u_int8_t ether_dhost[ETHER_ADDR_LEN]; 56 u_int8_t ether_shost[ETHER_ADDR_LEN]; 57 u_int16_t ether_type; 58 }; 59 60 #include <net/ethertypes.h> 61 62 #define ETHER_IS_MULTICAST(addr) (*(addr) & 0x01) /* is address mcast/bcast? */ 63 64 #define ETHERMTU 1500 65 #define ETHERMIN (60-14) 66 #define ETHER_CRC_LEN 4 67 68 #ifdef _KERNEL 69 /* 70 * Macro to map an IP multicast address to an Ethernet multicast address. 71 * The high-order 25 bits of the Ethernet address are statically assigned, 72 * and the low-order 23 bits are taken from the low end of the IP address. 73 */ 74 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \ 75 /* struct in_addr *ipaddr; */ \ 76 /* u_int8_t enaddr[ETHER_ADDR_LEN]; */ \ 77 { \ 78 (enaddr)[0] = 0x01; \ 79 (enaddr)[1] = 0x00; \ 80 (enaddr)[2] = 0x5e; \ 81 (enaddr)[3] = ((u_int8_t *)ipaddr)[1] & 0x7f; \ 82 (enaddr)[4] = ((u_int8_t *)ipaddr)[2]; \ 83 (enaddr)[5] = ((u_int8_t *)ipaddr)[3]; \ 84 } 85 #endif 86 87 /* 88 * Structure shared between the ethernet driver modules and 89 * the multicast list code. For example, each ec_softc or il_softc 90 * begins with this structure. 91 */ 92 struct ethercom { 93 struct ifnet ec_if; /* network-visible interface */ 94 LIST_HEAD(, ether_multi) ec_multiaddrs; /* list of ether multicast addrs */ 95 int ec_multicnt; /* length of ac_multiaddrs list */ 96 }; 97 98 #ifdef _KERNEL 99 u_int8_t etherbroadcastaddr[ETHER_ADDR_LEN]; 100 u_int8_t ether_ipmulticast_min[ETHER_ADDR_LEN]; 101 u_int8_t ether_ipmulticast_max[ETHER_ADDR_LEN]; 102 103 int ether_addmulti __P((struct ifreq *, struct ethercom *)); 104 int ether_delmulti __P((struct ifreq *, struct ethercom *)); 105 #endif /* _KERNEL */ 106 107 /* 108 * Ethernet multicast address structure. There is one of these for each 109 * multicast address or range of multicast addresses that we are supposed 110 * to listen to on a particular interface. They are kept in a linked list, 111 * rooted in the interface's ethercom structure. 112 */ 113 struct ether_multi { 114 u_int8_t enm_addrlo[ETHER_ADDR_LEN]; /* low or only address of range */ 115 u_int8_t enm_addrhi[ETHER_ADDR_LEN]; /* high or only address of range */ 116 struct ethercom *enm_ec; /* back pointer to ethercom */ 117 u_int enm_refcount; /* no. claims to this addr/range */ 118 LIST_ENTRY(ether_multi) enm_list; 119 }; 120 121 /* 122 * Structure used by macros below to remember position when stepping through 123 * all of the ether_multi records. 124 */ 125 struct ether_multistep { 126 struct ether_multi *e_enm; 127 }; 128 129 /* 130 * Macro for looking up the ether_multi record for a given range of Ethernet 131 * multicast addresses connected to a given ethercom structure. If no matching 132 * record is found, "enm" returns NULL. 133 */ 134 #define ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm) \ 135 /* u_int8_t addrlo[ETHER_ADDR_LEN]; */ \ 136 /* u_int8_t addrhi[ETHER_ADDR_LEN]; */ \ 137 /* struct ethercom *ec; */ \ 138 /* struct ether_multi *enm; */ \ 139 { \ 140 for ((enm) = (ec)->ec_multiaddrs.lh_first; \ 141 (enm) != NULL && \ 142 (bcmp((enm)->enm_addrlo, (addrlo), ETHER_ADDR_LEN) != 0 || \ 143 bcmp((enm)->enm_addrhi, (addrhi), ETHER_ADDR_LEN) != 0); \ 144 (enm) = (enm)->enm_list.le_next); \ 145 } 146 147 /* 148 * Macro to step through all of the ether_multi records, one at a time. 149 * The current position is remembered in "step", which the caller must 150 * provide. ETHER_FIRST_MULTI(), below, must be called to initialize "step" 151 * and get the first record. Both macros return a NULL "enm" when there 152 * are no remaining records. 153 */ 154 #define ETHER_NEXT_MULTI(step, enm) \ 155 /* struct ether_multistep step; */ \ 156 /* struct ether_multi *enm; */ \ 157 { \ 158 if (((enm) = (step).e_enm) != NULL) \ 159 (step).e_enm = (enm)->enm_list.le_next; \ 160 } 161 162 #define ETHER_FIRST_MULTI(step, ec, enm) \ 163 /* struct ether_multistep step; */ \ 164 /* struct ethercom *ec; */ \ 165 /* struct ether_multi *enm; */ \ 166 { \ 167 (step).e_enm = (ec)->ec_multiaddrs.lh_first; \ 168 ETHER_NEXT_MULTI((step), (enm)); \ 169 } 170 171 /* 172 * Prototype ethers(3) functions. 173 */ 174 #ifndef _KERNEL 175 #include <sys/cdefs.h> 176 __BEGIN_DECLS 177 char * ether_ntoa __P((struct ether_addr *)); 178 struct ether_addr * 179 ether_aton __P((const char *)); 180 int ether_ntohost __P((char *, struct ether_addr *)); 181 int ether_hostton __P((const char *, struct ether_addr *)); 182 int ether_line __P((const char *, struct ether_addr *, char *)); 183 __END_DECLS 184 #endif 185 186 #endif /* _NET_IF_ETHER_H_ */ 187
Indexes created Fri Oct 03 02:09:57 GMT 2025