1 /* $OpenBSD: if_ether.h,v 1.6 1999/01/07 09:11:52 deraadt Exp $ */ 2 /* $NetBSD: if_ether.h,v 1.22 1996/05/11 13:00:00 mycroft Exp $ */ 3 4 /* 5 * Copyright (c) 1982, 1986, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)if_ether.h 8.1 (Berkeley) 6/10/93 37 */ 38 39 /* 40 * Ethernet address - 6 octets 41 * this is only used by the ethers(3) functions. 42 */ 43 struct ether_addr { 44 u_int8_t ether_addr_octet[6]; 45 }; 46 47 /* 48 * Structure of a 10Mb/s Ethernet header. 49 */ 50 #define ETHER_ADDR_LEN 6 51 52 struct ether_header { 53 u_int8_t ether_dhost[ETHER_ADDR_LEN]; 54 u_int8_t ether_shost[ETHER_ADDR_LEN]; 55 u_int16_t ether_type; 56 }; 57 58 #define ETHERTYPE_PUP 0x0200 /* PUP protocol */ 59 #define ETHERTYPE_IP 0x0800 /* IP protocol */ 60 #define ETHERTYPE_ARP 0x0806 /* address resolution protocol */ 61 #define ETHERTYPE_REVARP 0x8035 /* reverse addr resolution protocol */ 62 #define ETHERTYPE_IPV6 0x86DD /* IPv6 protocol */ 63 64 /* 65 * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have 66 * (type-ETHERTYPE_TRAIL)*512 bytes of data followed 67 * by an ETHER type (as given above) and then the (variable-length) header. 68 */ 69 #define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */ 70 #define ETHERTYPE_NTRAILER 16 71 72 #define ETHER_IS_MULTICAST(addr) (*(addr) & 0x01) /* is address mcast/bcast? */ 73 74 #define ETHERMTU 1500 75 #define ETHERMIN (60-14) 76 77 #ifdef _KERNEL 78 /* 79 * Macro to map an IP multicast address to an Ethernet multicast address. 80 * The high-order 25 bits of the Ethernet address are statically assigned, 81 * and the low-order 23 bits are taken from the low end of the IP address. 82 */ 83 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \ 84 /* struct in_addr *ipaddr; */ \ 85 /* u_int8_t enaddr[ETHER_ADDR_LEN]; */ \ 86 { \ 87 (enaddr)[0] = 0x01; \ 88 (enaddr)[1] = 0x00; \ 89 (enaddr)[2] = 0x5e; \ 90 (enaddr)[3] = ((u_int8_t *)ipaddr)[1] & 0x7f; \ 91 (enaddr)[4] = ((u_int8_t *)ipaddr)[2]; \ 92 (enaddr)[5] = ((u_int8_t *)ipaddr)[3]; \ 93 } 94 #endif 95 96 /* 97 * Ethernet Address Resolution Protocol. 98 * 99 * See RFC 826 for protocol description. Structure below is adapted 100 * to resolving internet addresses. Field names used correspond to 101 * RFC 826. 102 */ 103 struct ether_arp { 104 struct arphdr ea_hdr; /* fixed-size header */ 105 u_int8_t arp_sha[ETHER_ADDR_LEN]; /* sender hardware address */ 106 u_int8_t arp_spa[4]; /* sender protocol address */ 107 u_int8_t arp_tha[ETHER_ADDR_LEN]; /* target hardware address */ 108 u_int8_t arp_tpa[4]; /* target protocol address */ 109 }; 110 #define arp_hrd ea_hdr.ar_hrd 111 #define arp_pro ea_hdr.ar_pro 112 #define arp_hln ea_hdr.ar_hln 113 #define arp_pln ea_hdr.ar_pln 114 #define arp_op ea_hdr.ar_op 115 116 /* 117 * Structure shared between the ethernet driver modules and 118 * the address resolution code. For example, each ec_softc or il_softc 119 * begins with this structure. 120 */ 121 struct arpcom { 122 struct ifnet ac_if; /* network-visible interface */ 123 u_int8_t ac_enaddr[ETHER_ADDR_LEN]; /* ethernet hardware address */ 124 char ac__pad[2]; /* pad for some machines */ 125 LIST_HEAD(, ether_multi) ac_multiaddrs; /* list of ether multicast addrs */ 126 int ac_multicnt; /* length of ac_multiaddrs list */ 127 }; 128 129 struct llinfo_arp { 130 LIST_ENTRY(llinfo_arp) la_list; 131 struct rtentry *la_rt; 132 struct mbuf *la_hold; /* last packet until resolved/timeout */ 133 long la_asked; /* last time we QUERIED for this addr */ 134 #define la_timer la_rt->rt_rmx.rmx_expire /* deletion time in seconds */ 135 }; 136 137 struct sockaddr_inarp { 138 u_int8_t sin_len; 139 u_int8_t sin_family; 140 u_int16_t sin_port; 141 struct in_addr sin_addr; 142 struct in_addr sin_srcaddr; 143 u_int16_t sin_tos; 144 u_int16_t sin_other; 145 #define SIN_PROXY 1 146 }; 147 148 /* 149 * IP and ethernet specific routing flags 150 */ 151 #define RTF_USETRAILERS RTF_PROTO1 /* use trailers */ 152 #define RTF_ANNOUNCE RTF_PROTO2 /* announce new arp entry */ 153 154 #ifdef _KERNEL 155 u_int8_t etherbroadcastaddr[ETHER_ADDR_LEN]; 156 u_int8_t ether_ipmulticast_min[ETHER_ADDR_LEN]; 157 u_int8_t ether_ipmulticast_max[ETHER_ADDR_LEN]; 158 struct ifqueue arpintrq; 159 160 void arpwhohas __P((struct arpcom *, struct in_addr *)); 161 void arpintr __P((void)); 162 int arpresolve __P((struct arpcom *, 163 struct rtentry *, struct mbuf *, struct sockaddr *, u_char *)); 164 void arp_ifinit __P((struct arpcom *, struct ifaddr *)); 165 void arp_rtrequest __P((int, struct rtentry *, struct sockaddr *)); 166 167 int ether_addmulti __P((struct ifreq *, struct arpcom *)); 168 int ether_delmulti __P((struct ifreq *, struct arpcom *)); 169 #endif /* _KERNEL */ 170 171 /* 172 * Ethernet multicast address structure. There is one of these for each 173 * multicast address or range of multicast addresses that we are supposed 174 * to listen to on a particular interface. They are kept in a linked list, 175 * rooted in the interface's arpcom structure. (This really has nothing to 176 * do with ARP, or with the Internet address family, but this appears to be 177 * the minimally-disrupting place to put it.) 178 */ 179 struct ether_multi { 180 u_int8_t enm_addrlo[ETHER_ADDR_LEN]; /* low or only address of range */ 181 u_int8_t enm_addrhi[ETHER_ADDR_LEN]; /* high or only address of range */ 182 struct arpcom *enm_ac; /* back pointer to arpcom */ 183 u_int enm_refcount; /* no. claims to this addr/range */ 184 LIST_ENTRY(ether_multi) enm_list; 185 }; 186 187 /* 188 * Structure used by macros below to remember position when stepping through 189 * all of the ether_multi records. 190 */ 191 struct ether_multistep { 192 struct ether_multi *e_enm; 193 }; 194 195 /* 196 * Macro for looking up the ether_multi record for a given range of Ethernet 197 * multicast addresses connected to a given arpcom structure. If no matching 198 * record is found, "enm" returns NULL. 199 */ 200 #define ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm) \ 201 /* u_int8_t addrlo[ETHER_ADDR_LEN]; */ \ 202 /* u_int8_t addrhi[ETHER_ADDR_LEN]; */ \ 203 /* struct arpcom *ac; */ \ 204 /* struct ether_multi *enm; */ \ 205 { \ 206 for ((enm) = (ac)->ac_multiaddrs.lh_first; \ 207 (enm) != NULL && \ 208 (bcmp((enm)->enm_addrlo, (addrlo), ETHER_ADDR_LEN) != 0 || \ 209 bcmp((enm)->enm_addrhi, (addrhi), ETHER_ADDR_LEN) != 0); \ 210 (enm) = (enm)->enm_list.le_next); \ 211 } 212 213 /* 214 * Macro to step through all of the ether_multi records, one at a time. 215 * The current position is remembered in "step", which the caller must 216 * provide. ETHER_FIRST_MULTI(), below, must be called to initialize "step" 217 * and get the first record. Both macros return a NULL "enm" when there 218 * are no remaining records. 219 */ 220 #define ETHER_NEXT_MULTI(step, enm) \ 221 /* struct ether_multistep step; */ \ 222 /* struct ether_multi *enm; */ \ 223 { \ 224 if (((enm) = (step).e_enm) != NULL) \ 225 (step).e_enm = (enm)->enm_list.le_next; \ 226 } 227 228 #define ETHER_FIRST_MULTI(step, ac, enm) \ 229 /* struct ether_multistep step; */ \ 230 /* struct arpcom *ac; */ \ 231 /* struct ether_multi *enm; */ \ 232 { \ 233 (step).e_enm = (ac)->ac_multiaddrs.lh_first; \ 234 ETHER_NEXT_MULTI((step), (enm)); \ 235 } 236 237 #ifdef _KERNEL 238 239 void arp_rtrequest __P((int, struct rtentry *, struct sockaddr *)); 240 int arpresolve __P((struct arpcom *, struct rtentry *, struct mbuf *, 241 struct sockaddr *, u_char *)); 242 void arpintr __P((void)); 243 int arpioctl __P((u_long, caddr_t)); 244 void arp_ifinit __P((struct arpcom *, struct ifaddr *)); 245 void revarpinput __P((struct mbuf *)); 246 void in_revarpinput __P((struct mbuf *)); 247 void revarprequest __P((struct ifnet *)); 248 int revarpwhoarewe __P((struct ifnet *, struct in_addr *, struct in_addr *)); 249 int revarpwhoami __P((struct in_addr *, struct ifnet *)); 250 int db_show_arptab __P((void)); 251 252 #else 253 254 char *ether_ntoa __P((struct ether_addr *)); 255 struct ether_addr *ether_aton __P((char *)); 256 int ether_ntohost __P((char *, struct ether_addr *)); 257 int ether_hostton __P((char *, struct ether_addr *)); 258 int ether_line __P((char *, struct ether_addr *, char *)); 259 260 #endif 261