1 /* $NetBSD: if_ether.h,v 1.3 1997/11/02 14:26:15 lukem 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 /* 39 * Ethernet address - 6 octets 40 * this is only used by the ethers(3) functions. 41 */ 42 struct ether_addr { 43 u_int8_t ether_addr_octet[6]; 44 }; 45 46 /* 47 * Structure of a 10Mb/s Ethernet header. 48 */ 49 #define ETHER_ADDR_LEN 6 50 51 struct ether_header { 52 u_int8_t ether_dhost[ETHER_ADDR_LEN]; 53 u_int8_t ether_shost[ETHER_ADDR_LEN]; 54 u_int16_t ether_type; 55 }; 56 57 #include <net/ethertypes.h> 58 59 #define ETHER_IS_MULTICAST(addr) (*(addr) & 0x01) /* is address mcast/bcast? */ 60 61 #define ETHERMTU 1500 62 #define ETHERMIN (60-14) 63 64 #ifdef _KERNEL 65 /* 66 * Macro to map an IP multicast address to an Ethernet multicast address. 67 * The high-order 25 bits of the Ethernet address are statically assigned, 68 * and the low-order 23 bits are taken from the low end of the IP address. 69 */ 70 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \ 71 /* struct in_addr *ipaddr; */ \ 72 /* u_int8_t enaddr[ETHER_ADDR_LEN]; */ \ 73 { \ 74 (enaddr)[0] = 0x01; \ 75 (enaddr)[1] = 0x00; \ 76 (enaddr)[2] = 0x5e; \ 77 (enaddr)[3] = ((u_int8_t *)ipaddr)[1] & 0x7f; \ 78 (enaddr)[4] = ((u_int8_t *)ipaddr)[2]; \ 79 (enaddr)[5] = ((u_int8_t *)ipaddr)[3]; \ 80 } 81 #endif 82 83 /* 84 * Structure shared between the ethernet driver modules and 85 * the multicast list code. For example, each ec_softc or il_softc 86 * begins with this structure. 87 */ 88 struct ethercom { 89 struct ifnet ec_if; /* network-visible interface */ 90 LIST_HEAD(, ether_multi) ec_multiaddrs; /* list of ether multicast addrs */ 91 int ec_multicnt; /* length of ac_multiaddrs list */ 92 }; 93 94 #ifdef _KERNEL 95 u_int8_t etherbroadcastaddr[ETHER_ADDR_LEN]; 96 u_int8_t ether_ipmulticast_min[ETHER_ADDR_LEN]; 97 u_int8_t ether_ipmulticast_max[ETHER_ADDR_LEN]; 98 99 int ether_addmulti __P((struct ifreq *, struct ethercom *)); 100 int ether_delmulti __P((struct ifreq *, struct ethercom *)); 101 #endif /* _KERNEL */ 102 103 /* 104 * Ethernet multicast address structure. There is one of these for each 105 * multicast address or range of multicast addresses that we are supposed 106 * to listen to on a particular interface. They are kept in a linked list, 107 * rooted in the interface's ethercom structure. (This really has nothing to 108 * do with ARP, or with the Internet address family, but this appears to be 109 * the minimally-disrupting place to put it.) 110 */ 111 struct ether_multi { 112 u_int8_t enm_addrlo[ETHER_ADDR_LEN]; /* low or only address of range */ 113 u_int8_t enm_addrhi[ETHER_ADDR_LEN]; /* high or only address of range */ 114 struct ethercom *enm_ec; /* back pointer to ethercom */ 115 u_int enm_refcount; /* no. claims to this addr/range */ 116 LIST_ENTRY(ether_multi) enm_list; 117 }; 118 119 /* 120 * Structure used by macros below to remember position when stepping through 121 * all of the ether_multi records. 122 */ 123 struct ether_multistep { 124 struct ether_multi *e_enm; 125 }; 126 127 /* 128 * Macro for looking up the ether_multi record for a given range of Ethernet 129 * multicast addresses connected to a given ethercom structure. If no matching 130 * record is found, "enm" returns NULL. 131 */ 132 #define ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm) \ 133 /* u_int8_t addrlo[ETHER_ADDR_LEN]; */ \ 134 /* u_int8_t addrhi[ETHER_ADDR_LEN]; */ \ 135 /* struct ethercom *ec; */ \ 136 /* struct ether_multi *enm; */ \ 137 { \ 138 for ((enm) = (ec)->ec_multiaddrs.lh_first; \ 139 (enm) != NULL && \ 140 (bcmp((enm)->enm_addrlo, (addrlo), ETHER_ADDR_LEN) != 0 || \ 141 bcmp((enm)->enm_addrhi, (addrhi), ETHER_ADDR_LEN) != 0); \ 142 (enm) = (enm)->enm_list.le_next); \ 143 } 144 145 /* 146 * Macro to step through all of the ether_multi records, one at a time. 147 * The current position is remembered in "step", which the caller must 148 * provide. ETHER_FIRST_MULTI(), below, must be called to initialize "step" 149 * and get the first record. Both macros return a NULL "enm" when there 150 * are no remaining records. 151 */ 152 #define ETHER_NEXT_MULTI(step, enm) \ 153 /* struct ether_multistep step; */ \ 154 /* struct ether_multi *enm; */ \ 155 { \ 156 if (((enm) = (step).e_enm) != NULL) \ 157 (step).e_enm = (enm)->enm_list.le_next; \ 158 } 159 160 #define ETHER_FIRST_MULTI(step, ec, enm) \ 161 /* struct ether_multistep step; */ \ 162 /* struct ethercom *ec; */ \ 163 /* struct ether_multi *enm; */ \ 164 { \ 165 (step).e_enm = (ec)->ec_multiaddrs.lh_first; \ 166 ETHER_NEXT_MULTI((step), (enm)); \ 167 } 168 169 /* 170 * Prototype ethers(3) functions. 171 */ 172 #ifndef _KERNEL 173 #include <sys/cdefs.h> 174 __BEGIN_DECLS 175 char * ether_ntoa __P((struct ether_addr *)); 176 struct ether_addr * 177 ether_aton __P((const char *)); 178 int ether_ntohost __P((char *, struct ether_addr *)); 179 int ether_hostton __P((const char *, struct ether_addr *)); 180 int ether_line __P((const char *, struct ether_addr *, char *)); 181 __END_DECLS 182 #endif 183