if_ether.h revision 1.18
1 /* $NetBSD: if_ether.h,v 1.18 2000/09/28 07:15:27 enami 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 } __attribute__((__packed__)); 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 } __attribute__((__packed__)); 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 /* 76 * Ethernet CRC32 polynomials (big- and little-endian verions). 77 */ 78 #define ETHER_CRC_POLY_LE 0xedb88320 79 #define ETHER_CRC_POLY_BE 0x04c11db6 80 81 #ifndef _STANDALONE 82 83 /* 84 * Ethernet-specific mbuf flags. 85 */ 86 #define M_HASFCS M_LINK0 /* FCS included at end of frame */ 87 88 #ifdef _KERNEL 89 /* 90 * Macro to map an IP multicast address to an Ethernet multicast address. 91 * The high-order 25 bits of the Ethernet address are statically assigned, 92 * and the low-order 23 bits are taken from the low end of the IP address. 93 */ 94 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \ 95 /* struct in_addr *ipaddr; */ \ 96 /* u_int8_t enaddr[ETHER_ADDR_LEN]; */ \ 97 { \ 98 (enaddr)[0] = 0x01; \ 99 (enaddr)[1] = 0x00; \ 100 (enaddr)[2] = 0x5e; \ 101 (enaddr)[3] = ((u_int8_t *)ipaddr)[1] & 0x7f; \ 102 (enaddr)[4] = ((u_int8_t *)ipaddr)[2]; \ 103 (enaddr)[5] = ((u_int8_t *)ipaddr)[3]; \ 104 } 105 /* 106 * Macro to map an IP6 multicast address to an Ethernet multicast address. 107 * The high-order 16 bits of the Ethernet address are statically assigned, 108 * and the low-order 32 bits are taken from the low end of the IP6 address. 109 */ 110 #define ETHER_MAP_IPV6_MULTICAST(ip6addr, enaddr) \ 111 /* struct in6_addr *ip6addr; */ \ 112 /* u_int8_t enaddr[ETHER_ADDR_LEN]; */ \ 113 { \ 114 (enaddr)[0] = 0x33; \ 115 (enaddr)[1] = 0x33; \ 116 (enaddr)[2] = ((u_int8_t *)ip6addr)[12]; \ 117 (enaddr)[3] = ((u_int8_t *)ip6addr)[13]; \ 118 (enaddr)[4] = ((u_int8_t *)ip6addr)[14]; \ 119 (enaddr)[5] = ((u_int8_t *)ip6addr)[15]; \ 120 } 121 #endif 122 123 /* 124 * Structure shared between the ethernet driver modules and 125 * the multicast list code. For example, each ec_softc or il_softc 126 * begins with this structure. 127 */ 128 struct ethercom { 129 struct ifnet ec_if; /* network-visible interface */ 130 LIST_HEAD(, ether_multi) ec_multiaddrs; /* list of ether multicast addrs */ 131 int ec_multicnt; /* length of ec_multiaddrs list */ 132 }; 133 134 #ifdef _KERNEL 135 extern u_int8_t etherbroadcastaddr[ETHER_ADDR_LEN]; 136 extern u_int8_t ether_ipmulticast_min[ETHER_ADDR_LEN]; 137 extern u_int8_t ether_ipmulticast_max[ETHER_ADDR_LEN]; 138 139 int ether_addmulti (struct ifreq *, struct ethercom *); 140 int ether_delmulti (struct ifreq *, struct ethercom *); 141 int ether_changeaddr (struct ifreq *, struct ethercom *); 142 int ether_multiaddr(struct sockaddr *, u_int8_t[], u_int8_t[]); 143 #endif /* _KERNEL */ 144 145 /* 146 * Ethernet multicast address structure. There is one of these for each 147 * multicast address or range of multicast addresses that we are supposed 148 * to listen to on a particular interface. They are kept in a linked list, 149 * rooted in the interface's ethercom structure. 150 */ 151 struct ether_multi { 152 u_int8_t enm_addrlo[ETHER_ADDR_LEN]; /* low or only address of range */ 153 u_int8_t enm_addrhi[ETHER_ADDR_LEN]; /* high or only address of range */ 154 struct ethercom *enm_ec; /* back pointer to ethercom */ 155 u_int enm_refcount; /* no. claims to this addr/range */ 156 LIST_ENTRY(ether_multi) enm_list; 157 }; 158 159 /* 160 * Structure used by macros below to remember position when stepping through 161 * all of the ether_multi records. 162 */ 163 struct ether_multistep { 164 struct ether_multi *e_enm; 165 }; 166 167 /* 168 * Macro for looking up the ether_multi record for a given range of Ethernet 169 * multicast addresses connected to a given ethercom structure. If no matching 170 * record is found, "enm" returns NULL. 171 */ 172 #define ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm) \ 173 /* u_int8_t addrlo[ETHER_ADDR_LEN]; */ \ 174 /* u_int8_t addrhi[ETHER_ADDR_LEN]; */ \ 175 /* struct ethercom *ec; */ \ 176 /* struct ether_multi *enm; */ \ 177 { \ 178 for ((enm) = (ec)->ec_multiaddrs.lh_first; \ 179 (enm) != NULL && \ 180 (bcmp((enm)->enm_addrlo, (addrlo), ETHER_ADDR_LEN) != 0 || \ 181 bcmp((enm)->enm_addrhi, (addrhi), ETHER_ADDR_LEN) != 0); \ 182 (enm) = (enm)->enm_list.le_next); \ 183 } 184 185 /* 186 * Macro to step through all of the ether_multi records, one at a time. 187 * The current position is remembered in "step", which the caller must 188 * provide. ETHER_FIRST_MULTI(), below, must be called to initialize "step" 189 * and get the first record. Both macros return a NULL "enm" when there 190 * are no remaining records. 191 */ 192 #define ETHER_NEXT_MULTI(step, enm) \ 193 /* struct ether_multistep step; */ \ 194 /* struct ether_multi *enm; */ \ 195 { \ 196 if (((enm) = (step).e_enm) != NULL) \ 197 (step).e_enm = (enm)->enm_list.le_next; \ 198 } 199 200 #define ETHER_FIRST_MULTI(step, ec, enm) \ 201 /* struct ether_multistep step; */ \ 202 /* struct ethercom *ec; */ \ 203 /* struct ether_multi *enm; */ \ 204 { \ 205 (step).e_enm = (ec)->ec_multiaddrs.lh_first; \ 206 ETHER_NEXT_MULTI((step), (enm)); \ 207 } 208 209 #ifdef _KERNEL 210 u_int32_t ether_crc32_le (const u_int8_t *, size_t); 211 u_int32_t ether_crc32_be (const u_int8_t *, size_t); 212 #else 213 /* 214 * Prototype ethers(3) functions. 215 */ 216 #include <sys/cdefs.h> 217 __BEGIN_DECLS 218 char * ether_ntoa __P((struct ether_addr *)); 219 struct ether_addr * 220 ether_aton __P((const char *)); 221 int ether_ntohost __P((char *, struct ether_addr *)); 222 int ether_hostton __P((const char *, struct ether_addr *)); 223 int ether_line __P((const char *, struct ether_addr *, char *)); 224 __END_DECLS 225 #endif 226 227 #endif /* _STANDALONE */ 228 229 #endif /* _NET_IF_ETHER_H_ */ 230
Indexes created Tue Sep 23 02:09:52 GMT 2025