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 8.3 (Berkeley) 5/2/95 34 * $Id: if_ether.h,v 1.14 1996/03/23 01:32:30 fenner Exp $ 35 */ 36 37 #ifndef _NETINET_IF_ETHER_H_ 38 #define _NETINET_IF_ETHER_H_ 39 40 #include <net/ethernet.h> 41 42 #define ETHERTYPE_PUP 0x0200 /* PUP protocol */ 43 #define ETHERTYPE_IP 0x0800 /* IP protocol */ 44 #define ETHERTYPE_ARP 0x0806 /* Addr. resolution protocol */ 45 #define ETHERTYPE_REVARP 0x8035 /* reverse Addr. resolution protocol */ 46 47 /* 48 * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have 49 * (type-ETHERTYPE_TRAIL)*512 bytes of data followed 50 * by an ETHER type (as given above) and then the (variable-length) header. 51 */ 52 #define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */ 53 #define ETHERTYPE_NTRAILER 16 54 55 #define ETHERMTU (ETHER_MAX_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN) 56 #define ETHERMIN (ETHER_MIN_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN) 57 58 #ifdef KERNEL 59 /* 60 * Macro to map an IP multicast address to an Ethernet multicast address. 61 * The high-order 25 bits of the Ethernet address are statically assigned, 62 * and the low-order 23 bits are taken from the low end of the IP address. 63 */ 64 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \ 65 /* struct in_addr *ipaddr; */ \ 66 /* u_char enaddr[ETHER_ADDR_LEN]; */ \ 67 { \ 68 (enaddr)[0] = 0x01; \ 69 (enaddr)[1] = 0x00; \ 70 (enaddr)[2] = 0x5e; \ 71 (enaddr)[3] = ((u_char *)ipaddr)[1] & 0x7f; \ 72 (enaddr)[4] = ((u_char *)ipaddr)[2]; \ 73 (enaddr)[5] = ((u_char *)ipaddr)[3]; \ 74 } 75 #endif 76 77 /* 78 * Ethernet Address Resolution Protocol. 79 * 80 * See RFC 826 for protocol description. Structure below is adapted 81 * to resolving internet addresses. Field names used correspond to 82 * RFC 826. 83 */ 84 struct ether_arp { 85 struct arphdr ea_hdr; /* fixed-size header */ 86 u_char arp_sha[ETHER_ADDR_LEN]; /* sender hardware address */ 87 u_char arp_spa[4]; /* sender protocol address */ 88 u_char arp_tha[ETHER_ADDR_LEN]; /* target hardware address */ 89 u_char arp_tpa[4]; /* target protocol address */ 90 }; 91 #define arp_hrd ea_hdr.ar_hrd 92 #define arp_pro ea_hdr.ar_pro 93 #define arp_hln ea_hdr.ar_hln 94 #define arp_pln ea_hdr.ar_pln 95 #define arp_op ea_hdr.ar_op 96 97 98 /* 99 * Structure shared between the ethernet driver modules and 100 * the address resolution code. For example, each ec_softc or il_softc 101 * begins with this structure. 102 */ 103 struct arpcom { 104 /* 105 * The ifnet struct _must_ be at the head of this structure. 106 */ 107 struct ifnet ac_if; /* network-visible interface */ 108 u_char ac_enaddr[ETHER_ADDR_LEN]; /* ethernet hardware address */ 109 struct ether_multi *ac_multiaddrs; /* list of ether multicast addrs */ 110 int ac_multicnt; /* length of ac_multiaddrs list */ 111 }; 112 113 struct sockaddr_inarp { 114 u_char sin_len; 115 u_char sin_family; 116 u_short sin_port; 117 struct in_addr sin_addr; 118 struct in_addr sin_srcaddr; 119 u_short sin_tos; 120 u_short sin_other; 121 #define SIN_PROXY 1 122 }; 123 /* 124 * IP and ethernet specific routing flags 125 */ 126 #define RTF_USETRAILERS RTF_PROTO1 /* use trailers */ 127 #define RTF_ANNOUNCE RTF_PROTO2 /* announce new arp entry */ 128 129 #ifdef KERNEL 130 extern u_char etherbroadcastaddr[ETHER_ADDR_LEN]; 131 extern u_char ether_ipmulticast_min[ETHER_ADDR_LEN]; 132 extern u_char ether_ipmulticast_max[ETHER_ADDR_LEN]; 133 extern struct ifqueue arpintrq; 134 135 int arpresolve __P((struct arpcom *, struct rtentry *, struct mbuf *, 136 struct sockaddr *, u_char *, struct rtentry *)); 137 void arp_ifinit __P((struct arpcom *, struct ifaddr *)); 138 int ether_addmulti __P((struct ifreq *, struct arpcom *)); 139 int ether_delmulti __P((struct ifreq *, struct arpcom *)); 140 141 /* 142 * Ethernet multicast address structure. There is one of these for each 143 * multicast address or range of multicast addresses that we are supposed 144 * to listen to on a particular interface. They are kept in a linked list, 145 * rooted in the interface's arpcom structure. (This really has nothing to 146 * do with ARP, or with the Internet address family, but this appears to be 147 * the minimally-disrupting place to put it.) 148 */ 149 struct ether_multi { 150 u_char enm_addrlo[ETHER_ADDR_LEN]; /* low or only address of range */ 151 u_char enm_addrhi[ETHER_ADDR_LEN]; /* high or only address of range */ 152 struct arpcom *enm_ac; /* back pointer to arpcom */ 153 u_int enm_refcount; /* no. claims to this addr/range */ 154 struct ether_multi *enm_next; /* ptr to next ether_multi */ 155 }; 156 157 /* 158 * Structure used by macros below to remember position when stepping through 159 * all of the ether_multi records. 160 */ 161 struct ether_multistep { 162 struct ether_multi *e_enm; 163 }; 164 165 /* 166 * Macro for looking up the ether_multi record for a given range of Ethernet 167 * multicast addresses connected to a given arpcom structure. If no matching 168 * record is found, "enm" returns NULL. 169 */ 170 #define ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm) \ 171 /* u_char addrlo[ETHER_ADDR_LEN]; */ \ 172 /* u_char addrhi[ETHER_ADDR_LEN]; */ \ 173 /* struct arpcom *ac; */ \ 174 /* struct ether_multi *enm; */ \ 175 { \ 176 for ((enm) = (ac)->ac_multiaddrs; \ 177 (enm) != NULL && \ 178 (bcmp((enm)->enm_addrlo, (addrlo), ETHER_ADDR_LEN) != 0 || \ 179 bcmp((enm)->enm_addrhi, (addrhi), ETHER_ADDR_LEN) != 0); \ 180 (enm) = (enm)->enm_next); \ 181 } 182 183 /* 184 * Macro to step through all of the ether_multi records, one at a time. 185 * The current position is remembered in "step", which the caller must 186 * provide. ETHER_FIRST_MULTI(), below, must be called to initialize "step" 187 * and get the first record. Both macros return a NULL "enm" when there 188 * are no remaining records. 189 */ 190 #define ETHER_NEXT_MULTI(step, enm) \ 191 /* struct ether_multistep step; */ \ 192 /* struct ether_multi *enm; */ \ 193 { \ 194 if (((enm) = (step).e_enm) != NULL) \ 195 (step).e_enm = (enm)->enm_next; \ 196 } 197 198 #define ETHER_FIRST_MULTI(step, ac, enm) \ 199 /* struct ether_multistep step; */ \ 200 /* struct arpcom *ac; */ \ 201 /* struct ether_multi *enm; */ \ 202 { \ 203 (step).e_enm = (ac)->ac_multiaddrs; \ 204 ETHER_NEXT_MULTI((step), (enm)); \ 205 } 206 207 #endif 208 209 #endif 210