1 /* $NetBSD: if_ether.h,v 1.13 1995/03/26 20:32:21 jtc 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_char ether_addr_octet[6]; 44 }; 45 46 /* 47 * Structure of a 10Mb/s Ethernet header. 48 */ 49 struct ether_header { 50 u_char ether_dhost[6]; 51 u_char ether_shost[6]; 52 u_short ether_type; 53 }; 54 55 #define ETHERTYPE_PUP 0x0200 /* PUP protocol */ 56 #define ETHERTYPE_IP 0x0800 /* IP protocol */ 57 #define ETHERTYPE_ARP 0x0806 /* address resolution protocol */ 58 #define ETHERTYPE_REVARP 0x8035 /* reverse addr resolution protocol */ 59 60 /* 61 * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have 62 * (type-ETHERTYPE_TRAIL)*512 bytes of data followed 63 * by an ETHER type (as given above) and then the (variable-length) header. 64 */ 65 #define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */ 66 #define ETHERTYPE_NTRAILER 16 67 68 #define ETHERMTU 1500 69 #define ETHERMIN (60-14) 70 71 #ifdef _KERNEL 72 /* 73 * Macro to map an IP multicast address to an Ethernet multicast address. 74 * The high-order 25 bits of the Ethernet address are statically assigned, 75 * and the low-order 23 bits are taken from the low end of the IP address. 76 */ 77 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \ 78 /* struct in_addr *ipaddr; */ \ 79 /* u_char enaddr[6]; */ \ 80 { \ 81 (enaddr)[0] = 0x01; \ 82 (enaddr)[1] = 0x00; \ 83 (enaddr)[2] = 0x5e; \ 84 (enaddr)[3] = ((u_char *)ipaddr)[1] & 0x7f; \ 85 (enaddr)[4] = ((u_char *)ipaddr)[2]; \ 86 (enaddr)[5] = ((u_char *)ipaddr)[3]; \ 87 } 88 #endif 89 90 /* 91 * Ethernet Address Resolution Protocol. 92 * 93 * See RFC 826 for protocol description. Structure below is adapted 94 * to resolving internet addresses. Field names used correspond to 95 * RFC 826. 96 */ 97 struct ether_arp { 98 struct arphdr ea_hdr; /* fixed-size header */ 99 u_char arp_sha[6]; /* sender hardware address */ 100 u_char arp_spa[4]; /* sender protocol address */ 101 u_char arp_tha[6]; /* target hardware address */ 102 u_char arp_tpa[4]; /* target protocol address */ 103 }; 104 #define arp_hrd ea_hdr.ar_hrd 105 #define arp_pro ea_hdr.ar_pro 106 #define arp_hln ea_hdr.ar_hln 107 #define arp_pln ea_hdr.ar_pln 108 #define arp_op ea_hdr.ar_op 109 110 /* 111 * Structure shared between the ethernet driver modules and 112 * the address resolution code. For example, each ec_softc or il_softc 113 * begins with this structure. 114 */ 115 struct arpcom { 116 struct ifnet ac_if; /* network-visible interface */ 117 u_char ac_enaddr[6]; /* ethernet hardware address */ 118 struct in_addr ac_ipaddr; /* copy of ip address- XXX */ 119 struct ether_multi *ac_multiaddrs; /* list of ether multicast addrs */ 120 int ac_multicnt; /* length of ac_multiaddrs list */ 121 }; 122 123 struct llinfo_arp { 124 struct llinfo_arp *la_next; 125 struct llinfo_arp *la_prev; 126 struct rtentry *la_rt; 127 struct mbuf *la_hold; /* last packet until resolved/timeout */ 128 long la_asked; /* last time we QUERIED for this addr */ 129 #define la_timer la_rt->rt_rmx.rmx_expire /* deletion time in seconds */ 130 }; 131 132 struct sockaddr_inarp { 133 u_char sin_len; 134 u_char sin_family; 135 u_short sin_port; 136 struct in_addr sin_addr; 137 struct in_addr sin_srcaddr; 138 u_short sin_tos; 139 u_short sin_other; 140 #define SIN_PROXY 1 141 }; 142 143 /* 144 * IP and ethernet specific routing flags 145 */ 146 #define RTF_USETRAILERS RTF_PROTO1 /* use trailers */ 147 #define RTF_ANNOUNCE RTF_PROTO2 /* announce new arp entry */ 148 149 #ifdef KERNEL 150 u_char etherbroadcastaddr[6]; 151 u_char ether_ipmulticast_min[6]; 152 u_char ether_ipmulticast_max[6]; 153 struct ifqueue arpintrq; 154 155 struct llinfo_arp llinfo_arp; /* head of the llinfo queue */ 156 157 void arpwhohas __P((struct arpcom *, struct in_addr *)); 158 void arpintr __P((void)); 159 int arpresolve __P((struct arpcom *, 160 struct rtentry *, struct mbuf *, struct sockaddr *, u_char *)); 161 void arp_rtrequest __P((int, struct rtentry *, struct sockaddr *)); 162 163 int ether_addmulti __P((struct ifreq *, struct arpcom *)); 164 int ether_delmulti __P((struct ifreq *, struct arpcom *)); 165 166 /* 167 * Ethernet multicast address structure. There is one of these for each 168 * multicast address or range of multicast addresses that we are supposed 169 * to listen to on a particular interface. They are kept in a linked list, 170 * rooted in the interface's arpcom structure. (This really has nothing to 171 * do with ARP, or with the Internet address family, but this appears to be 172 * the minimally-disrupting place to put it.) 173 */ 174 struct ether_multi { 175 u_char enm_addrlo[6]; /* low or only address of range */ 176 u_char enm_addrhi[6]; /* high or only address of range */ 177 struct arpcom *enm_ac; /* back pointer to arpcom */ 178 u_int enm_refcount; /* no. claims to this addr/range */ 179 struct ether_multi *enm_next; /* ptr to next ether_multi */ 180 }; 181 182 /* 183 * Structure used by macros below to remember position when stepping through 184 * all of the ether_multi records. 185 */ 186 struct ether_multistep { 187 struct ether_multi *e_enm; 188 }; 189 190 /* 191 * Macro for looking up the ether_multi record for a given range of Ethernet 192 * multicast addresses connected to a given arpcom structure. If no matching 193 * record is found, "enm" returns NULL. 194 */ 195 #define ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm) \ 196 /* u_char addrlo[6]; */ \ 197 /* u_char addrhi[6]; */ \ 198 /* struct arpcom *ac; */ \ 199 /* struct ether_multi *enm; */ \ 200 { \ 201 for ((enm) = (ac)->ac_multiaddrs; \ 202 (enm) != NULL && \ 203 (bcmp((enm)->enm_addrlo, (addrlo), 6) != 0 || \ 204 bcmp((enm)->enm_addrhi, (addrhi), 6) != 0); \ 205 (enm) = (enm)->enm_next); \ 206 } 207 208 /* 209 * Macro to step through all of the ether_multi records, one at a time. 210 * The current position is remembered in "step", which the caller must 211 * provide. ETHER_FIRST_MULTI(), below, must be called to initialize "step" 212 * and get the first record. Both macros return a NULL "enm" when there 213 * are no remaining records. 214 */ 215 #define ETHER_NEXT_MULTI(step, enm) \ 216 /* struct ether_multistep step; */ \ 217 /* struct ether_multi *enm; */ \ 218 { \ 219 if (((enm) = (step).e_enm) != NULL) \ 220 (step).e_enm = (enm)->enm_next; \ 221 } 222 223 #define ETHER_FIRST_MULTI(step, ac, enm) \ 224 /* struct ether_multistep step; */ \ 225 /* struct arpcom *ac; */ \ 226 /* struct ether_multi *enm; */ \ 227 { \ 228 (step).e_enm = (ac)->ac_multiaddrs; \ 229 ETHER_NEXT_MULTI((step), (enm)); \ 230 } 231 #endif 232