if_ether.h revision 1.1.2.2
1 /* $NetBSD: if_ether.h,v 1.1.2.2 1997/02/18 13:27:44 is 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 #define ETHERTYPE_PUP 0x0200 /* PUP protocol */ 58 #define ETHERTYPE_IP 0x0800 /* IP protocol */ 59 #define ETHERTYPE_ARP 0x0806 /* address resolution protocol */ 60 #define ETHERTYPE_REVARP 0x8035 /* reverse addr resolution protocol */ 61 62 /* 63 * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have 64 * (type-ETHERTYPE_TRAIL)*512 bytes of data followed 65 * by an ETHER type (as given above) and then the (variable-length) header. 66 */ 67 #define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */ 68 #define ETHERTYPE_NTRAILER 16 69 70 #define ETHER_IS_MULTICAST(addr) (*(addr) & 0x01) /* is address mcast/bcast? */ 71 72 #define ETHERMTU 1500 73 #define ETHERMIN (60-14) 74 75 #ifdef _KERNEL 76 /* 77 * Macro to map an IP multicast address to an Ethernet multicast address. 78 * The high-order 25 bits of the Ethernet address are statically assigned, 79 * and the low-order 23 bits are taken from the low end of the IP address. 80 */ 81 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \ 82 /* struct in_addr *ipaddr; */ \ 83 /* u_int8_t enaddr[ETHER_ADDR_LEN]; */ \ 84 { \ 85 (enaddr)[0] = 0x01; \ 86 (enaddr)[1] = 0x00; \ 87 (enaddr)[2] = 0x5e; \ 88 (enaddr)[3] = ((u_int8_t *)ipaddr)[1] & 0x7f; \ 89 (enaddr)[4] = ((u_int8_t *)ipaddr)[2]; \ 90 (enaddr)[5] = ((u_int8_t *)ipaddr)[3]; \ 91 } 92 #endif 93 94 /* 95 * Structure shared between the ethernet driver modules and 96 * the multicast list code. For example, each ec_softc or il_softc 97 * begins with this structure. 98 */ 99 struct ethercom { 100 struct ifnet ec_if; /* network-visible interface */ 101 LIST_HEAD(, ether_multi) ec_multiaddrs; /* list of ether multicast addrs */ 102 int ec_multicnt; /* length of ac_multiaddrs list */ 103 }; 104 105 #ifdef _KERNEL 106 u_int8_t etherbroadcastaddr[ETHER_ADDR_LEN]; 107 u_int8_t ether_ipmulticast_min[ETHER_ADDR_LEN]; 108 u_int8_t ether_ipmulticast_max[ETHER_ADDR_LEN]; 109 110 int ether_addmulti __P((struct ifreq *, struct ethercom *)); 111 int ether_delmulti __P((struct ifreq *, struct ethercom *)); 112 #endif /* _KERNEL */ 113 114 /* 115 * Ethernet multicast address structure. There is one of these for each 116 * multicast address or range of multicast addresses that we are supposed 117 * to listen to on a particular interface. They are kept in a linked list, 118 * rooted in the interface's ethercom structure. (This really has nothing to 119 * do with ARP, or with the Internet address family, but this appears to be 120 * the minimally-disrupting place to put it.) 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((char *)); 189 int ether_ntohost __P((char *, struct ether_addr *)); 190 int ether_hostton __P((char *, struct ether_addr *)); 191 int ether_line __P((char *, struct ether_addr *, char *)); 192 __END_DECLS 193 #endif 194
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