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 */ 35 36 /* 37 * Structure of a 10Mb/s Ethernet header. 38 */ 39 struct ether_header { 40 u_char ether_dhost[6]; 41 u_char ether_shost[6]; 42 u_short ether_type; 43 }; 44 45 #define ETHERTYPE_PUP 0x0200 /* PUP protocol */ 46 #define ETHERTYPE_IP 0x0800 /* IP protocol */ 47 #define ETHERTYPE_ARP 0x0806 /* Addr. resolution protocol */ 48 #define ETHERTYPE_REVARP 0x8035 /* reverse Addr. resolution protocol */ 49 50 /* 51 * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have 52 * (type-ETHERTYPE_TRAIL)*512 bytes of data followed 53 * by an ETHER type (as given above) and then the (variable-length) header. 54 */ 55 #define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */ 56 #define ETHERTYPE_NTRAILER 16 57 58 #define ETHERMTU 1500 59 #define ETHERMIN (60-14) 60 61 #ifdef KERNEL 62 /* 63 * Macro to map an IP multicast address to an Ethernet multicast address. 64 * The high-order 25 bits of the Ethernet address are statically assigned, 65 * and the low-order 23 bits are taken from the low end of the IP address. 66 */ 67 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \ 68 /* struct in_addr *ipaddr; */ \ 69 /* u_char enaddr[6]; */ \ 70 { \ 71 (enaddr)[0] = 0x01; \ 72 (enaddr)[1] = 0x00; \ 73 (enaddr)[2] = 0x5e; \ 74 (enaddr)[3] = ((u_char *)ipaddr)[1] & 0x7f; \ 75 (enaddr)[4] = ((u_char *)ipaddr)[2]; \ 76 (enaddr)[5] = ((u_char *)ipaddr)[3]; \ 77 } 78 #endif 79 80 /* 81 * Ethernet Address Resolution Protocol. 82 * 83 * See RFC 826 for protocol description. Structure below is adapted 84 * to resolving internet addresses. Field names used correspond to 85 * RFC 826. 86 */ 87 struct ether_arp { 88 struct arphdr ea_hdr; /* fixed-size header */ 89 u_char arp_sha[6]; /* sender hardware address */ 90 u_char arp_spa[4]; /* sender protocol address */ 91 u_char arp_tha[6]; /* target hardware address */ 92 u_char arp_tpa[4]; /* target protocol address */ 93 }; 94 #define arp_hrd ea_hdr.ar_hrd 95 #define arp_pro ea_hdr.ar_pro 96 #define arp_hln ea_hdr.ar_hln 97 #define arp_pln ea_hdr.ar_pln 98 #define arp_op ea_hdr.ar_op 99 100 101 /* 102 * Structure shared between the ethernet driver modules and 103 * the address resolution code. For example, each ec_softc or il_softc 104 * begins with this structure. 105 */ 106 struct arpcom { 107 struct ifnet ac_if; /* network-visible interface */ 108 u_char ac_enaddr[6]; /* ethernet hardware address */ 109 struct in_addr ac_ipaddr; /* copy of ip address- XXX */ 110 struct ether_multi *ac_multiaddrs; /* list of ether multicast addrs */ 111 int ac_multicnt; /* length of ac_multiaddrs list */ 112 }; 113 114 struct llinfo_arp { 115 struct llinfo_arp *la_next; 116 struct llinfo_arp *la_prev; 117 struct rtentry *la_rt; 118 struct mbuf *la_hold; /* last packet until resolved/timeout */ 119 long la_asked; /* last time we QUERIED for this addr */ 120 #define la_timer la_rt->rt_rmx.rmx_expire /* deletion time in seconds */ 121 }; 122 123 struct sockaddr_inarp { 124 u_char sin_len; 125 u_char sin_family; 126 u_short sin_port; 127 struct in_addr sin_addr; 128 struct in_addr sin_srcaddr; 129 u_short sin_tos; 130 u_short sin_other; 131 #define SIN_PROXY 1 132 }; 133 /* 134 * IP and ethernet specific routing flags 135 */ 136 #define RTF_USETRAILERS RTF_PROTO1 /* use trailers */ 137 #define RTF_ANNOUNCE RTF_PROTO2 /* announce new arp entry */ 138 139 #ifdef KERNEL 140 u_char etherbroadcastaddr[6]; 141 u_char ether_ipmulticast_min[6]; 142 u_char ether_ipmulticast_max[6]; 143 struct ifqueue arpintrq; 144 145 struct llinfo_arp *arptnew __P((struct in_addr *)); 146 struct llinfo_arp llinfo_arp; /* head of the llinfo queue */ 147 148 void arpwhohas __P((struct arpcom *, struct in_addr *)); 149 void arpintr __P((void)); 150 int arpresolve __P((struct arpcom *, 151 struct rtentry *, struct mbuf *, struct sockaddr *, u_char *)); 152 void arp_rtrequest __P((int, struct rtentry *, struct sockaddr *)); 153 void arpwhohas __P((struct arpcom *, struct in_addr *)); 154 155 int ether_addmulti __P((struct ifreq *, struct arpcom *)); 156 int ether_delmulti __P((struct ifreq *, struct arpcom *)); 157 158 /* 159 * Ethernet multicast address structure. There is one of these for each 160 * multicast address or range of multicast addresses that we are supposed 161 * to listen to on a particular interface. They are kept in a linked list, 162 * rooted in the interface's arpcom structure. (This really has nothing to 163 * do with ARP, or with the Internet address family, but this appears to be 164 * the minimally-disrupting place to put it.) 165 */ 166 struct ether_multi { 167 u_char enm_addrlo[6]; /* low or only address of range */ 168 u_char enm_addrhi[6]; /* high or only address of range */ 169 struct arpcom *enm_ac; /* back pointer to arpcom */ 170 u_int enm_refcount; /* no. claims to this addr/range */ 171 struct ether_multi *enm_next; /* ptr to next ether_multi */ 172 }; 173 174 /* 175 * Structure used by macros below to remember position when stepping through 176 * all of the ether_multi records. 177 */ 178 struct ether_multistep { 179 struct ether_multi *e_enm; 180 }; 181 182 /* 183 * Macro for looking up the ether_multi record for a given range of Ethernet 184 * multicast addresses connected to a given arpcom structure. If no matching 185 * record is found, "enm" returns NULL. 186 */ 187 #define ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm) \ 188 /* u_char addrlo[6]; */ \ 189 /* u_char addrhi[6]; */ \ 190 /* struct arpcom *ac; */ \ 191 /* struct ether_multi *enm; */ \ 192 { \ 193 for ((enm) = (ac)->ac_multiaddrs; \ 194 (enm) != NULL && \ 195 (bcmp((enm)->enm_addrlo, (addrlo), 6) != 0 || \ 196 bcmp((enm)->enm_addrhi, (addrhi), 6) != 0); \ 197 (enm) = (enm)->enm_next); \ 198 } 199 200 /* 201 * Macro to step through all of the ether_multi records, one at a time. 202 * The current position is remembered in "step", which the caller must 203 * provide. ETHER_FIRST_MULTI(), below, must be called to initialize "step" 204 * and get the first record. Both macros return a NULL "enm" when there 205 * are no remaining records. 206 */ 207 #define ETHER_NEXT_MULTI(step, enm) \ 208 /* struct ether_multistep step; */ \ 209 /* struct ether_multi *enm; */ \ 210 { \ 211 if (((enm) = (step).e_enm) != NULL) \ 212 (step).e_enm = (enm)->enm_next; \ 213 } 214 215 #define ETHER_FIRST_MULTI(step, ac, enm) \ 216 /* struct ether_multistep step; */ \ 217 /* struct arpcom *ac; */ \ 218 /* struct ether_multi *enm; */ \ 219 { \ 220 (step).e_enm = (ac)->ac_multiaddrs; \ 221 ETHER_NEXT_MULTI((step), (enm)); \ 222 } 223 224 #endif 225