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 1.15 1996/08/06 21:14:28 phk Exp $ 35 */ 36 37 #ifndef _NETINET_IF_ETHER_H_ 38 #define _NETINET_IF_ETHER_H_ 39 40 #include <net/ethernet.h> 41 #include <net/if_arp.h> 42 43 #define ETHERTYPE_PUP 0x0200 /* PUP protocol */ 44 #define ETHERTYPE_IP 0x0800 /* IP protocol */ 45 #define ETHERTYPE_ARP 0x0806 /* Addr. resolution protocol */ 46 #define ETHERTYPE_REVARP 0x8035 /* reverse Addr. resolution protocol */ 47 48 /* 49 * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have 50 * (type-ETHERTYPE_TRAIL)*512 bytes of data followed 51 * by an ETHER type (as given above) and then the (variable-length) header. 52 */ 53 #define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */ 54 #define ETHERTYPE_NTRAILER 16 55 56 #define ETHERMTU (ETHER_MAX_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN) 57 #define ETHERMIN (ETHER_MIN_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN) 58 59 #ifdef KERNEL 60 /* 61 * Macro to map an IP multicast address to an Ethernet multicast address. 62 * The high-order 25 bits of the Ethernet address are statically assigned, 63 * and the low-order 23 bits are taken from the low end of the IP address. 64 */ 65 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \ 66 /* struct in_addr *ipaddr; */ \ 67 /* u_char enaddr[ETHER_ADDR_LEN]; */ \ 68 { \ 69 (enaddr)[0] = 0x01; \ 70 (enaddr)[1] = 0x00; \ 71 (enaddr)[2] = 0x5e; \ 72 (enaddr)[3] = ((u_char *)ipaddr)[1] & 0x7f; \ 73 (enaddr)[4] = ((u_char *)ipaddr)[2]; \ 74 (enaddr)[5] = ((u_char *)ipaddr)[3]; \ 75 } 76 #endif 77 78 /* 79 * Ethernet Address Resolution Protocol. 80 * 81 * See RFC 826 for protocol description. Structure below is adapted 82 * to resolving internet addresses. Field names used correspond to 83 * RFC 826. 84 */ 85 struct ether_arp { 86 struct arphdr ea_hdr; /* fixed-size header */ 87 u_char arp_sha[ETHER_ADDR_LEN]; /* sender hardware address */ 88 u_char arp_spa[4]; /* sender protocol address */ 89 u_char arp_tha[ETHER_ADDR_LEN]; /* target hardware address */ 90 u_char arp_tpa[4]; /* target protocol address */ 91 }; 92 #define arp_hrd ea_hdr.ar_hrd 93 #define arp_pro ea_hdr.ar_pro 94 #define arp_hln ea_hdr.ar_hln 95 #define arp_pln ea_hdr.ar_pln 96 #define arp_op ea_hdr.ar_op 97 98 99 /* 100 * Structure shared between the ethernet driver modules and 101 * the address resolution code. For example, each ec_softc or il_softc 102 * begins with this structure. 103 */ 104 struct arpcom { 105 /* 106 * The ifnet struct _must_ be at the head of this structure. 107 */ 108 struct ifnet ac_if; /* network-visible interface */ 109 u_char ac_enaddr[ETHER_ADDR_LEN]; /* ethernet hardware address */ 110 struct ether_multi *ac_multiaddrs; /* list of ether multicast addrs */ 111 int ac_multicnt; /* length of ac_multiaddrs list */ 112 }; 113 114 struct sockaddr_inarp { 115 u_char sin_len; 116 u_char sin_family; 117 u_short sin_port; 118 struct in_addr sin_addr; 119 struct in_addr sin_srcaddr; 120 u_short sin_tos; 121 u_short sin_other; 122 #define SIN_PROXY 1 123 }; 124 /* 125 * IP and ethernet specific routing flags 126 */ 127 #define RTF_USETRAILERS RTF_PROTO1 /* use trailers */ 128 #define RTF_ANNOUNCE RTF_PROTO2 /* announce new arp entry */ 129 130 #ifdef KERNEL 131 extern u_char etherbroadcastaddr[ETHER_ADDR_LEN]; 132 extern u_char ether_ipmulticast_min[ETHER_ADDR_LEN]; 133 extern u_char ether_ipmulticast_max[ETHER_ADDR_LEN]; 134 extern struct ifqueue arpintrq; 135 136 int arpresolve __P((struct arpcom *, struct rtentry *, struct mbuf *, 137 struct sockaddr *, u_char *, struct rtentry *)); 138 void arp_ifinit __P((struct arpcom *, struct ifaddr *)); 139 int ether_addmulti __P((struct ifreq *, struct arpcom *)); 140 int ether_delmulti __P((struct ifreq *, struct arpcom *)); 141 142 /* 143 * Ethernet multicast address structure. There is one of these for each 144 * multicast address or range of multicast addresses that we are supposed 145 * to listen to on a particular interface. They are kept in a linked list, 146 * rooted in the interface's arpcom structure. (This really has nothing to 147 * do with ARP, or with the Internet address family, but this appears to be 148 * the minimally-disrupting place to put it.) 149 */ 150 struct ether_multi { 151 u_char enm_addrlo[ETHER_ADDR_LEN]; /* low or only address of range */ 152 u_char enm_addrhi[ETHER_ADDR_LEN]; /* high or only address of range */ 153 struct arpcom *enm_ac; /* back pointer to arpcom */ 154 u_int enm_refcount; /* no. claims to this addr/range */ 155 struct ether_multi *enm_next; /* ptr to next ether_multi */ 156 }; 157 158 /* 159 * Structure used by macros below to remember position when stepping through 160 * all of the ether_multi records. 161 */ 162 struct ether_multistep { 163 struct ether_multi *e_enm; 164 }; 165 166 /* 167 * Macro for looking up the ether_multi record for a given range of Ethernet 168 * multicast addresses connected to a given arpcom structure. If no matching 169 * record is found, "enm" returns NULL. 170 */ 171 #define ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm) \ 172 /* u_char addrlo[ETHER_ADDR_LEN]; */ \ 173 /* u_char addrhi[ETHER_ADDR_LEN]; */ \ 174 /* struct arpcom *ac; */ \ 175 /* struct ether_multi *enm; */ \ 176 { \ 177 for ((enm) = (ac)->ac_multiaddrs; \ 178 (enm) != NULL && \ 179 (bcmp((enm)->enm_addrlo, (addrlo), ETHER_ADDR_LEN) != 0 || \ 180 bcmp((enm)->enm_addrhi, (addrhi), ETHER_ADDR_LEN) != 0); \ 181 (enm) = (enm)->enm_next); \ 182 } 183 184 /* 185 * Macro to step through all of the ether_multi records, one at a time. 186 * The current position is remembered in "step", which the caller must 187 * provide. ETHER_FIRST_MULTI(), below, must be called to initialize "step" 188 * and get the first record. Both macros return a NULL "enm" when there 189 * are no remaining records. 190 */ 191 #define ETHER_NEXT_MULTI(step, enm) \ 192 /* struct ether_multistep step; */ \ 193 /* struct ether_multi *enm; */ \ 194 { \ 195 if (((enm) = (step).e_enm) != NULL) \ 196 (step).e_enm = (enm)->enm_next; \ 197 } 198 199 #define ETHER_FIRST_MULTI(step, ac, enm) \ 200 /* struct ether_multistep step; */ \ 201 /* struct arpcom *ac; */ \ 202 /* struct ether_multi *enm; */ \ 203 { \ 204 (step).e_enm = (ac)->ac_multiaddrs; \ 205 ETHER_NEXT_MULTI((step), (enm)); \ 206 } 207 208 #endif 209 210 #endif 211