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 1.3 1994/08/18 22:35:27 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 #define ETHERTYPE_PUP 0x0200 /* PUP protocol */ 50 #define ETHERTYPE_IP 0x0800 /* IP protocol */ 51 #define ETHERTYPE_ARP 0x0806 /* Addr. resolution protocol */ 52 #define ETHERTYPE_REVARP 0x8035 /* reverse Addr. resolution protocol */ 53 54 /* 55 * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have 56 * (type-ETHERTYPE_TRAIL)*512 bytes of data followed 57 * by an ETHER type (as given above) and then the (variable-length) header. 58 */ 59 #define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */ 60 #define ETHERTYPE_NTRAILER 16 61 62 #define ETHERMTU 1500 63 #define ETHERMIN (60-14) 64 65 #ifdef KERNEL 66 /* 67 * Macro to map an IP multicast address to an Ethernet multicast address. 68 * The high-order 25 bits of the Ethernet address are statically assigned, 69 * and the low-order 23 bits are taken from the low end of the IP address. 70 */ 71 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \ 72 /* struct in_addr *ipaddr; */ \ 73 /* u_char enaddr[6]; */ \ 74 { \ 75 (enaddr)[0] = 0x01; \ 76 (enaddr)[1] = 0x00; \ 77 (enaddr)[2] = 0x5e; \ 78 (enaddr)[3] = ((u_char *)ipaddr)[1] & 0x7f; \ 79 (enaddr)[4] = ((u_char *)ipaddr)[2]; \ 80 (enaddr)[5] = ((u_char *)ipaddr)[3]; \ 81 } 82 #endif 83 84 /* 85 * Ethernet Address Resolution Protocol. 86 * 87 * See RFC 826 for protocol description. Structure below is adapted 88 * to resolving internet addresses. Field names used correspond to 89 * RFC 826. 90 */ 91 struct ether_arp { 92 struct arphdr ea_hdr; /* fixed-size header */ 93 u_char arp_sha[6]; /* sender hardware address */ 94 u_char arp_spa[4]; /* sender protocol address */ 95 u_char arp_tha[6]; /* target hardware address */ 96 u_char arp_tpa[4]; /* target protocol address */ 97 }; 98 #define arp_hrd ea_hdr.ar_hrd 99 #define arp_pro ea_hdr.ar_pro 100 #define arp_hln ea_hdr.ar_hln 101 #define arp_pln ea_hdr.ar_pln 102 #define arp_op ea_hdr.ar_op 103 104 105 /* 106 * Structure shared between the ethernet driver modules and 107 * the address resolution code. For example, each ec_softc or il_softc 108 * begins with this structure. 109 */ 110 struct arpcom { 111 struct ifnet ac_if; /* network-visible interface */ 112 u_char ac_enaddr[6]; /* ethernet hardware address */ 113 struct in_addr ac_ipaddr; /* copy of ip address- XXX */ 114 struct ether_multi *ac_multiaddrs; /* list of ether multicast addrs */ 115 int ac_multicnt; /* length of ac_multiaddrs list */ 116 }; 117 118 struct llinfo_arp { 119 struct llinfo_arp *la_next; 120 struct llinfo_arp *la_prev; 121 struct rtentry *la_rt; 122 struct mbuf *la_hold; /* last packet until resolved/timeout */ 123 long la_asked; /* last time we QUERIED for this addr */ 124 #define la_timer la_rt->rt_rmx.rmx_expire /* deletion time in seconds */ 125 }; 126 127 struct sockaddr_inarp { 128 u_char sin_len; 129 u_char sin_family; 130 u_short sin_port; 131 struct in_addr sin_addr; 132 struct in_addr sin_srcaddr; 133 u_short sin_tos; 134 u_short sin_other; 135 #define SIN_PROXY 1 136 }; 137 /* 138 * IP and ethernet specific routing flags 139 */ 140 #define RTF_USETRAILERS RTF_PROTO1 /* use trailers */ 141 #define RTF_ANNOUNCE RTF_PROTO2 /* announce new arp entry */ 142 143 #ifdef KERNEL 144 extern u_char etherbroadcastaddr[6]; 145 extern u_char ether_ipmulticast_min[6]; 146 extern u_char ether_ipmulticast_max[6]; 147 extern struct ifqueue arpintrq; 148 149 struct llinfo_arp *arptnew __P((struct in_addr *)); 150 extern struct llinfo_arp llinfo_arp; /* head of the llinfo queue */ 151 152 void arpwhohas __P((struct arpcom *, struct in_addr *)); 153 void arpintr __P((void)); 154 int arpresolve __P((struct arpcom *, 155 struct rtentry *, struct mbuf *, struct sockaddr *, u_char *)); 156 void arp_rtrequest __P((int, struct rtentry *, struct sockaddr *)); 157 158 int ether_addmulti __P((struct ifreq *, struct arpcom *)); 159 int ether_delmulti __P((struct ifreq *, struct arpcom *)); 160 161 /* 162 * Ethernet multicast address structure. There is one of these for each 163 * multicast address or range of multicast addresses that we are supposed 164 * to listen to on a particular interface. They are kept in a linked list, 165 * rooted in the interface's arpcom structure. (This really has nothing to 166 * do with ARP, or with the Internet address family, but this appears to be 167 * the minimally-disrupting place to put it.) 168 */ 169 struct ether_multi { 170 u_char enm_addrlo[6]; /* low or only address of range */ 171 u_char enm_addrhi[6]; /* high or only address of range */ 172 struct arpcom *enm_ac; /* back pointer to arpcom */ 173 u_int enm_refcount; /* no. claims to this addr/range */ 174 struct ether_multi *enm_next; /* ptr to next ether_multi */ 175 }; 176 177 /* 178 * Structure used by macros below to remember position when stepping through 179 * all of the ether_multi records. 180 */ 181 struct ether_multistep { 182 struct ether_multi *e_enm; 183 }; 184 185 /* 186 * Macro for looking up the ether_multi record for a given range of Ethernet 187 * multicast addresses connected to a given arpcom structure. If no matching 188 * record is found, "enm" returns NULL. 189 */ 190 #define ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm) \ 191 /* u_char addrlo[6]; */ \ 192 /* u_char addrhi[6]; */ \ 193 /* struct arpcom *ac; */ \ 194 /* struct ether_multi *enm; */ \ 195 { \ 196 for ((enm) = (ac)->ac_multiaddrs; \ 197 (enm) != NULL && \ 198 (bcmp((enm)->enm_addrlo, (addrlo), 6) != 0 || \ 199 bcmp((enm)->enm_addrhi, (addrhi), 6) != 0); \ 200 (enm) = (enm)->enm_next); \ 201 } 202 203 /* 204 * Macro to step through all of the ether_multi records, one at a time. 205 * The current position is remembered in "step", which the caller must 206 * provide. ETHER_FIRST_MULTI(), below, must be called to initialize "step" 207 * and get the first record. Both macros return a NULL "enm" when there 208 * are no remaining records. 209 */ 210 #define ETHER_NEXT_MULTI(step, enm) \ 211 /* struct ether_multistep step; */ \ 212 /* struct ether_multi *enm; */ \ 213 { \ 214 if (((enm) = (step).e_enm) != NULL) \ 215 (step).e_enm = (enm)->enm_next; \ 216 } 217 218 #define ETHER_FIRST_MULTI(step, ac, enm) \ 219 /* struct ether_multistep step; */ \ 220 /* struct arpcom *ac; */ \ 221 /* struct ether_multi *enm; */ \ 222 { \ 223 (step).e_enm = (ac)->ac_multiaddrs; \ 224 ETHER_NEXT_MULTI((step), (enm)); \ 225 } 226 227 #endif 228 229 #endif 230