if_ether.h revision 1.4
1 /* $NetBSD: if_ether.h,v 1.4 1998/02/09 17:43:49 perry 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 67 #ifdef _KERNEL 68 /* 69 * Macro to map an IP multicast address to an Ethernet multicast address. 70 * The high-order 25 bits of the Ethernet address are statically assigned, 71 * and the low-order 23 bits are taken from the low end of the IP address. 72 */ 73 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \ 74 /* struct in_addr *ipaddr; */ \ 75 /* u_int8_t enaddr[ETHER_ADDR_LEN]; */ \ 76 { \ 77 (enaddr)[0] = 0x01; \ 78 (enaddr)[1] = 0x00; \ 79 (enaddr)[2] = 0x5e; \ 80 (enaddr)[3] = ((u_int8_t *)ipaddr)[1] & 0x7f; \ 81 (enaddr)[4] = ((u_int8_t *)ipaddr)[2]; \ 82 (enaddr)[5] = ((u_int8_t *)ipaddr)[3]; \ 83 } 84 #endif 85 86 /* 87 * Structure shared between the ethernet driver modules and 88 * the multicast list code. For example, each ec_softc or il_softc 89 * begins with this structure. 90 */ 91 struct ethercom { 92 struct ifnet ec_if; /* network-visible interface */ 93 LIST_HEAD(, ether_multi) ec_multiaddrs; /* list of ether multicast addrs */ 94 int ec_multicnt; /* length of ac_multiaddrs list */ 95 }; 96 97 #ifdef _KERNEL 98 u_int8_t etherbroadcastaddr[ETHER_ADDR_LEN]; 99 u_int8_t ether_ipmulticast_min[ETHER_ADDR_LEN]; 100 u_int8_t ether_ipmulticast_max[ETHER_ADDR_LEN]; 101 102 int ether_addmulti __P((struct ifreq *, struct ethercom *)); 103 int ether_delmulti __P((struct ifreq *, struct ethercom *)); 104 #endif /* _KERNEL */ 105 106 /* 107 * Ethernet multicast address structure. There is one of these for each 108 * multicast address or range of multicast addresses that we are supposed 109 * to listen to on a particular interface. They are kept in a linked list, 110 * rooted in the interface's ethercom structure. (This really has nothing to 111 * do with ARP, or with the Internet address family, but this appears to be 112 * the minimally-disrupting place to put it.) 113 */ 114 struct ether_multi { 115 u_int8_t enm_addrlo[ETHER_ADDR_LEN]; /* low or only address of range */ 116 u_int8_t enm_addrhi[ETHER_ADDR_LEN]; /* high or only address of range */ 117 struct ethercom *enm_ec; /* back pointer to ethercom */ 118 u_int enm_refcount; /* no. claims to this addr/range */ 119 LIST_ENTRY(ether_multi) enm_list; 120 }; 121 122 /* 123 * Structure used by macros below to remember position when stepping through 124 * all of the ether_multi records. 125 */ 126 struct ether_multistep { 127 struct ether_multi *e_enm; 128 }; 129 130 /* 131 * Macro for looking up the ether_multi record for a given range of Ethernet 132 * multicast addresses connected to a given ethercom structure. If no matching 133 * record is found, "enm" returns NULL. 134 */ 135 #define ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm) \ 136 /* u_int8_t addrlo[ETHER_ADDR_LEN]; */ \ 137 /* u_int8_t addrhi[ETHER_ADDR_LEN]; */ \ 138 /* struct ethercom *ec; */ \ 139 /* struct ether_multi *enm; */ \ 140 { \ 141 for ((enm) = (ec)->ec_multiaddrs.lh_first; \ 142 (enm) != NULL && \ 143 (bcmp((enm)->enm_addrlo, (addrlo), ETHER_ADDR_LEN) != 0 || \ 144 bcmp((enm)->enm_addrhi, (addrhi), ETHER_ADDR_LEN) != 0); \ 145 (enm) = (enm)->enm_list.le_next); \ 146 } 147 148 /* 149 * Macro to step through all of the ether_multi records, one at a time. 150 * The current position is remembered in "step", which the caller must 151 * provide. ETHER_FIRST_MULTI(), below, must be called to initialize "step" 152 * and get the first record. Both macros return a NULL "enm" when there 153 * are no remaining records. 154 */ 155 #define ETHER_NEXT_MULTI(step, enm) \ 156 /* struct ether_multistep step; */ \ 157 /* struct ether_multi *enm; */ \ 158 { \ 159 if (((enm) = (step).e_enm) != NULL) \ 160 (step).e_enm = (enm)->enm_list.le_next; \ 161 } 162 163 #define ETHER_FIRST_MULTI(step, ec, enm) \ 164 /* struct ether_multistep step; */ \ 165 /* struct ethercom *ec; */ \ 166 /* struct ether_multi *enm; */ \ 167 { \ 168 (step).e_enm = (ec)->ec_multiaddrs.lh_first; \ 169 ETHER_NEXT_MULTI((step), (enm)); \ 170 } 171 172 /* 173 * Prototype ethers(3) functions. 174 */ 175 #ifndef _KERNEL 176 #include <sys/cdefs.h> 177 __BEGIN_DECLS 178 char * ether_ntoa __P((struct ether_addr *)); 179 struct ether_addr * 180 ether_aton __P((const char *)); 181 int ether_ntohost __P((char *, struct ether_addr *)); 182 int ether_hostton __P((const char *, struct ether_addr *)); 183 int ether_line __P((const char *, struct ether_addr *, char *)); 184 __END_DECLS 185 #endif 186 187 #endif /* _NET_IF_ETHER_H_ */ 188
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