1 /* 2 * Copyright (c) 1982, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)if_ether.h 8.1 (Berkeley) 6/10/93 34 * $Id: if_ether.h,v 1.7 1994/12/22 22:00:30 wollman Exp $ 35 */ 36 37 #ifndef _NETINET_IF_ETHER_H_ 38 #define _NETINET_IF_ETHER_H_ 39 40 /* 41 * Structure of a 10Mb/s Ethernet header. 42 */ 43 struct ether_header { 44 u_char ether_dhost[6]; 45 u_char ether_shost[6]; 46 u_short ether_type; 47 }; 48 49 /* 50 * Structure of a 48-bit Ethernet address. 51 */ 52 struct ether_addr { 53 u_char octet[6]; 54 }; 55 56 #define ETHERTYPE_PUP 0x0200 /* PUP protocol */ 57 #define ETHERTYPE_IP 0x0800 /* IP protocol */ 58 #define ETHERTYPE_ARP 0x0806 /* Addr. resolution protocol */ 59 #define ETHERTYPE_REVARP 0x8035 /* reverse Addr. resolution protocol */ 60 61 /* 62 * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have 63 * (type-ETHERTYPE_TRAIL)*512 bytes of data followed 64 * by an ETHER type (as given above) and then the (variable-length) header. 65 */ 66 #define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */ 67 #define ETHERTYPE_NTRAILER 16 68 69 #define ETHERMTU 1500 70 #define ETHERMIN (60-14) 71 72 #ifdef KERNEL 73 /* 74 * Macro to map an IP multicast address to an Ethernet multicast address. 75 * The high-order 25 bits of the Ethernet address are statically assigned, 76 * and the low-order 23 bits are taken from the low end of the IP address. 77 */ 78 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \ 79 /* struct in_addr *ipaddr; */ \ 80 /* u_char enaddr[6]; */ \ 81 { \ 82 (enaddr)[0] = 0x01; \ 83 (enaddr)[1] = 0x00; \ 84 (enaddr)[2] = 0x5e; \ 85 (enaddr)[3] = ((u_char *)ipaddr)[1] & 0x7f; \ 86 (enaddr)[4] = ((u_char *)ipaddr)[2]; \ 87 (enaddr)[5] = ((u_char *)ipaddr)[3]; \ 88 } 89 #endif 90 91 /* 92 * Ethernet Address Resolution Protocol. 93 * 94 * See RFC 826 for protocol description. Structure below is adapted 95 * to resolving internet addresses. Field names used correspond to 96 * RFC 826. 97 */ 98 struct ether_arp { 99 struct arphdr ea_hdr; /* fixed-size header */ 100 u_char arp_sha[6]; /* sender hardware address */ 101 u_char arp_spa[4]; /* sender protocol address */ 102 u_char arp_tha[6]; /* target hardware address */ 103 u_char arp_tpa[4]; /* target protocol address */ 104 }; 105 #define arp_hrd ea_hdr.ar_hrd 106 #define arp_pro ea_hdr.ar_pro 107 #define arp_hln ea_hdr.ar_hln 108 #define arp_pln ea_hdr.ar_pln 109 #define arp_op ea_hdr.ar_op 110 111 112 /* 113 * Structure shared between the ethernet driver modules and 114 * the address resolution code. For example, each ec_softc or il_softc 115 * begins with this structure. 116 */ 117 struct arpcom { 118 struct ifnet ac_if; /* network-visible interface */ 119 u_char ac_enaddr[6]; /* ethernet hardware address */ 120 struct in_addr ac_ipaddr; /* copy of ip address- XXX */ 121 struct ether_multi *ac_multiaddrs; /* list of ether multicast addrs */ 122 int ac_multicnt; /* length of ac_multiaddrs list */ 123 }; 124 125 struct llinfo_arp { 126 struct llinfo_arp *la_next; 127 struct llinfo_arp *la_prev; 128 struct rtentry *la_rt; 129 struct mbuf *la_hold; /* last packet until resolved/timeout */ 130 long la_asked; /* last time we QUERIED for this addr */ 131 #define la_timer la_rt->rt_rmx.rmx_expire /* deletion time in seconds */ 132 }; 133 134 struct sockaddr_inarp { 135 u_char sin_len; 136 u_char sin_family; 137 u_short sin_port; 138 struct in_addr sin_addr; 139 struct in_addr sin_srcaddr; 140 u_short sin_tos; 141 u_short sin_other; 142 #define SIN_PROXY 1 143 }; 144 /* 145 * IP and ethernet specific routing flags 146 */ 147 #define RTF_USETRAILERS RTF_PROTO1 /* use trailers */ 148 #define RTF_ANNOUNCE RTF_PROTO2 /* announce new arp entry */ 149 150 #ifdef KERNEL 151 extern u_char etherbroadcastaddr[6]; 152 extern u_char ether_ipmulticast_min[6]; 153 extern u_char ether_ipmulticast_max[6]; 154 extern struct ifqueue arpintrq; 155 156 struct llinfo_arp *arptnew __P((struct in_addr *)); 157 extern struct llinfo_arp llinfo_arp; /* head of the llinfo queue */ 158 159 void arpwhohas __P((struct arpcom *, struct in_addr *)); 160 void arpintr __P((void)); 161 int arpresolve __P((struct arpcom *, struct rtentry *, struct mbuf *, 162 struct sockaddr *, u_char *, struct rtentry *)); 163 void arp_ifinit __P((struct arpcom *, struct ifaddr *)); 164 165 int ether_addmulti __P((struct ifreq *, struct arpcom *)); 166 int ether_delmulti __P((struct ifreq *, struct arpcom *)); 167 168 /* 169 * Ethernet multicast address structure. There is one of these for each 170 * multicast address or range of multicast addresses that we are supposed 171 * to listen to on a particular interface. They are kept in a linked list, 172 * rooted in the interface's arpcom structure. (This really has nothing to 173 * do with ARP, or with the Internet address family, but this appears to be 174 * the minimally-disrupting place to put it.) 175 */ 176 struct ether_multi { 177 u_char enm_addrlo[6]; /* low or only address of range */ 178 u_char enm_addrhi[6]; /* high or only address of range */ 179 struct arpcom *enm_ac; /* back pointer to arpcom */ 180 u_int enm_refcount; /* no. claims to this addr/range */ 181 struct ether_multi *enm_next; /* ptr to next ether_multi */ 182 }; 183 184 /* 185 * Structure used by macros below to remember position when stepping through 186 * all of the ether_multi records. 187 */ 188 struct ether_multistep { 189 struct ether_multi *e_enm; 190 }; 191 192 /* 193 * Macro for looking up the ether_multi record for a given range of Ethernet 194 * multicast addresses connected to a given arpcom structure. If no matching 195 * record is found, "enm" returns NULL. 196 */ 197 #define ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm) \ 198 /* u_char addrlo[6]; */ \ 199 /* u_char addrhi[6]; */ \ 200 /* struct arpcom *ac; */ \ 201 /* struct ether_multi *enm; */ \ 202 { \ 203 for ((enm) = (ac)->ac_multiaddrs; \ 204 (enm) != NULL && \ 205 (bcmp((enm)->enm_addrlo, (addrlo), 6) != 0 || \ 206 bcmp((enm)->enm_addrhi, (addrhi), 6) != 0); \ 207 (enm) = (enm)->enm_next); \ 208 } 209 210 /* 211 * Macro to step through all of the ether_multi records, one at a time. 212 * The current position is remembered in "step", which the caller must 213 * provide. ETHER_FIRST_MULTI(), below, must be called to initialize "step" 214 * and get the first record. Both macros return a NULL "enm" when there 215 * are no remaining records. 216 */ 217 #define ETHER_NEXT_MULTI(step, enm) \ 218 /* struct ether_multistep step; */ \ 219 /* struct ether_multi *enm; */ \ 220 { \ 221 if (((enm) = (step).e_enm) != NULL) \ 222 (step).e_enm = (enm)->enm_next; \ 223 } 224 225 #define ETHER_FIRST_MULTI(step, ac, enm) \ 226 /* struct ether_multistep step; */ \ 227 /* struct arpcom *ac; */ \ 228 /* struct ether_multi *enm; */ \ 229 { \ 230 (step).e_enm = (ac)->ac_multiaddrs; \ 231 ETHER_NEXT_MULTI((step), (enm)); \ 232 } 233 234 #endif 235 236 #endif 237