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 * from: @(#)if_ether.h 8.1 (Berkeley) 6/10/93 34 * $Id: if_ether.h,v 1.9 1994/05/13 06:05:57 mycroft Exp $ 35 */ 36 37 /* 38 * Ethernet address - 6 octets 39 * this is only used by the ethers(3) functions. 40 */ 41 struct ether_addr { 42 u_char ether_addr_octet[6]; 43 }; 44 45 /* 46 * Structure of a 10Mb/s Ethernet header. 47 */ 48 struct ether_header { 49 u_char ether_dhost[6]; 50 u_char ether_shost[6]; 51 u_short ether_type; 52 }; 53 54 #define ETHERTYPE_PUP 0x0200 /* PUP protocol */ 55 #define ETHERTYPE_IP 0x0800 /* IP protocol */ 56 #define ETHERTYPE_ARP 0x0806 /* address resolution protocol */ 57 #define ETHERTYPE_REVARP 0x8035 /* reverse addr resolution protocol */ 58 59 /* 60 * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have 61 * (type-ETHERTYPE_TRAIL)*512 bytes of data followed 62 * by an ETHER type (as given above) and then the (variable-length) header. 63 */ 64 #define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */ 65 #define ETHERTYPE_NTRAILER 16 66 67 #define ETHERMTU 1500 68 #define ETHERMIN (60-14) 69 70 #ifdef KERNEL 71 /* 72 * Macro to map an IP multicast address to an Ethernet multicast address. 73 * The high-order 25 bits of the Ethernet address are statically assigned, 74 * and the low-order 23 bits are taken from the low end of the IP address. 75 */ 76 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \ 77 /* struct in_addr *ipaddr; */ \ 78 /* u_char enaddr[6]; */ \ 79 { \ 80 (enaddr)[0] = 0x01; \ 81 (enaddr)[1] = 0x00; \ 82 (enaddr)[2] = 0x5e; \ 83 (enaddr)[3] = ((u_char *)ipaddr)[1] & 0x7f; \ 84 (enaddr)[4] = ((u_char *)ipaddr)[2]; \ 85 (enaddr)[5] = ((u_char *)ipaddr)[3]; \ 86 } 87 #endif 88 89 /* 90 * Ethernet Address Resolution Protocol. 91 * 92 * See RFC 826 for protocol description. Structure below is adapted 93 * to resolving internet addresses. Field names used correspond to 94 * RFC 826. 95 */ 96 struct ether_arp { 97 struct arphdr ea_hdr; /* fixed-size header */ 98 u_char arp_sha[6]; /* sender hardware address */ 99 u_char arp_spa[4]; /* sender protocol address */ 100 u_char arp_tha[6]; /* target hardware address */ 101 u_char arp_tpa[4]; /* target protocol address */ 102 }; 103 #define arp_hrd ea_hdr.ar_hrd 104 #define arp_pro ea_hdr.ar_pro 105 #define arp_hln ea_hdr.ar_hln 106 #define arp_pln ea_hdr.ar_pln 107 #define arp_op ea_hdr.ar_op 108 109 /* 110 * Structure shared between the ethernet driver modules and 111 * the address resolution code. For example, each ec_softc or il_softc 112 * begins with this structure. 113 */ 114 struct arpcom { 115 struct ifnet ac_if; /* network-visible interface */ 116 u_char ac_enaddr[6]; /* ethernet hardware address */ 117 struct in_addr ac_ipaddr; /* copy of ip address- XXX */ 118 struct ether_multi *ac_multiaddrs; /* list of ether multicast addrs */ 119 int ac_multicnt; /* length of ac_multiaddrs list */ 120 }; 121 122 struct llinfo_arp { 123 struct llinfo_arp *la_next; 124 struct llinfo_arp *la_prev; 125 struct rtentry *la_rt; 126 struct mbuf *la_hold; /* last packet until resolved/timeout */ 127 long la_asked; /* last time we QUERIED for this addr */ 128 #define la_timer la_rt->rt_rmx.rmx_expire /* deletion time in seconds */ 129 }; 130 131 struct sockaddr_inarp { 132 u_char sin_len; 133 u_char sin_family; 134 u_short sin_port; 135 struct in_addr sin_addr; 136 struct in_addr sin_srcaddr; 137 u_short sin_tos; 138 u_short sin_other; 139 #define SIN_PROXY 1 140 }; 141 142 /* 143 * IP and ethernet specific routing flags 144 */ 145 #define RTF_USETRAILERS RTF_PROTO1 /* use trailers */ 146 #define RTF_ANNOUNCE RTF_PROTO2 /* announce new arp entry */ 147 148 #ifdef KERNEL 149 u_char etherbroadcastaddr[6]; 150 u_char ether_ipmulticast_min[6]; 151 u_char ether_ipmulticast_max[6]; 152 struct ifqueue arpintrq; 153 154 struct llinfo_arp *arptnew __P((struct in_addr *)); 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 void arpwhohas __P((struct arpcom *, struct in_addr *)); 163 164 int ether_addmulti __P((struct ifreq *, struct arpcom *)); 165 int ether_delmulti __P((struct ifreq *, struct arpcom *)); 166 167 /* 168 * Ethernet multicast address structure. There is one of these for each 169 * multicast address or range of multicast addresses that we are supposed 170 * to listen to on a particular interface. They are kept in a linked list, 171 * rooted in the interface's arpcom structure. (This really has nothing to 172 * do with ARP, or with the Internet address family, but this appears to be 173 * the minimally-disrupting place to put it.) 174 */ 175 struct ether_multi { 176 u_char enm_addrlo[6]; /* low or only address of range */ 177 u_char enm_addrhi[6]; /* high or only address of range */ 178 struct arpcom *enm_ac; /* back pointer to arpcom */ 179 u_int enm_refcount; /* no. claims to this addr/range */ 180 struct ether_multi *enm_next; /* ptr to next ether_multi */ 181 }; 182 183 /* 184 * Structure used by macros below to remember position when stepping through 185 * all of the ether_multi records. 186 */ 187 struct ether_multistep { 188 struct ether_multi *e_enm; 189 }; 190 191 /* 192 * Macro for looking up the ether_multi record for a given range of Ethernet 193 * multicast addresses connected to a given arpcom structure. If no matching 194 * record is found, "enm" returns NULL. 195 */ 196 #define ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm) \ 197 /* u_char addrlo[6]; */ \ 198 /* u_char addrhi[6]; */ \ 199 /* struct arpcom *ac; */ \ 200 /* struct ether_multi *enm; */ \ 201 { \ 202 for ((enm) = (ac)->ac_multiaddrs; \ 203 (enm) != NULL && \ 204 (bcmp((enm)->enm_addrlo, (addrlo), 6) != 0 || \ 205 bcmp((enm)->enm_addrhi, (addrhi), 6) != 0); \ 206 (enm) = (enm)->enm_next); \ 207 } 208 209 /* 210 * Macro to step through all of the ether_multi records, one at a time. 211 * The current position is remembered in "step", which the caller must 212 * provide. ETHER_FIRST_MULTI(), below, must be called to initialize "step" 213 * and get the first record. Both macros return a NULL "enm" when there 214 * are no remaining records. 215 */ 216 #define ETHER_NEXT_MULTI(step, enm) \ 217 /* struct ether_multistep step; */ \ 218 /* struct ether_multi *enm; */ \ 219 { \ 220 if (((enm) = (step).e_enm) != NULL) \ 221 (step).e_enm = (enm)->enm_next; \ 222 } 223 224 #define ETHER_FIRST_MULTI(step, ac, enm) \ 225 /* struct ether_multistep step; */ \ 226 /* struct arpcom *ac; */ \ 227 /* struct ether_multi *enm; */ \ 228 { \ 229 (step).e_enm = (ac)->ac_multiaddrs; \ 230 ETHER_NEXT_MULTI((step), (enm)); \ 231 } 232 #endif 233