1 /* 2 * Copyright (c) 1982, 1986 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)if_ether.h 7.8 (Berkeley) 07/06/92 8 */ 9 10 /* 11 * Structure of a 10Mb/s Ethernet header. 12 */ 13 struct ether_header { 14 u_char ether_dhost[6]; 15 u_char ether_shost[6]; 16 u_short ether_type; 17 }; 18 19 #define ETHERTYPE_PUP 0x0200 /* PUP protocol */ 20 #define ETHERTYPE_IP 0x0800 /* IP protocol */ 21 #define ETHERTYPE_ARP 0x0806 /* Addr. resolution protocol */ 22 #define ETHERTYPE_REVARP 0x8035 /* reverse Addr. resolution protocol */ 23 24 /* 25 * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have 26 * (type-ETHERTYPE_TRAIL)*512 bytes of data followed 27 * by an ETHER type (as given above) and then the (variable-length) header. 28 */ 29 #define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */ 30 #define ETHERTYPE_NTRAILER 16 31 32 #define ETHERMTU 1500 33 #define ETHERMIN (60-14) 34 35 #ifdef KERNEL 36 /* 37 * Macro to map an IP multicast address to an Ethernet multicast address. 38 * The high-order 25 bits of the Ethernet address are statically assigned, 39 * and the low-order 23 bits are taken from the low end of the IP address. 40 */ 41 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \ 42 /* struct in_addr *ipaddr; */ \ 43 /* u_char enaddr[6]; */ \ 44 { \ 45 (enaddr)[0] = 0x01; \ 46 (enaddr)[1] = 0x00; \ 47 (enaddr)[2] = 0x5e; \ 48 (enaddr)[3] = ((u_char *)ipaddr)[1] & 0x7f; \ 49 (enaddr)[4] = ((u_char *)ipaddr)[2]; \ 50 (enaddr)[5] = ((u_char *)ipaddr)[3]; \ 51 } 52 #endif 53 54 /* 55 * Ethernet Address Resolution Protocol. 56 * 57 * See RFC 826 for protocol description. Structure below is adapted 58 * to resolving internet addresses. Field names used correspond to 59 * RFC 826. 60 */ 61 struct ether_arp { 62 struct arphdr ea_hdr; /* fixed-size header */ 63 u_char arp_sha[6]; /* sender hardware address */ 64 u_char arp_spa[4]; /* sender protocol address */ 65 u_char arp_tha[6]; /* target hardware address */ 66 u_char arp_tpa[4]; /* target protocol address */ 67 }; 68 #define arp_hrd ea_hdr.ar_hrd 69 #define arp_pro ea_hdr.ar_pro 70 #define arp_hln ea_hdr.ar_hln 71 #define arp_pln ea_hdr.ar_pln 72 #define arp_op ea_hdr.ar_op 73 74 75 /* 76 * Structure shared between the ethernet driver modules and 77 * the address resolution code. For example, each ec_softc or il_softc 78 * begins with this structure. 79 */ 80 struct arpcom { 81 struct ifnet ac_if; /* network-visible interface */ 82 u_char ac_enaddr[6]; /* ethernet hardware address */ 83 struct in_addr ac_ipaddr; /* copy of ip address- XXX */ 84 struct ether_multi *ac_multiaddrs; /* list of ether multicast addrs */ 85 int ac_multicnt; /* length of ac_multiaddrs list */ 86 }; 87 88 /* 89 * Internet to ethernet address resolution table. 90 */ 91 struct arptab { 92 struct in_addr at_iaddr; /* internet address */ 93 u_char at_enaddr[6]; /* ethernet address */ 94 u_char at_timer; /* minutes since last reference */ 95 u_char at_flags; /* flags */ 96 struct mbuf *at_hold; /* last packet until resolved/timeout */ 97 }; /* XXX: only used to define SIOCGARP, which is no longer supported */ 98 99 struct llinfo_arp { 100 struct llinfo_arp *la_next; 101 struct llinfo_arp *la_prev; 102 struct rtentry *la_rt; 103 struct mbuf *la_hold; /* last packet until resolved/timeout */ 104 long la_asked; /* last time we QUERIED for this addr */ 105 #define la_timer la_rt->rt_rmx.rmx_expire /* deletion time in seconds */ 106 }; 107 108 struct sockaddr_inarp { 109 u_char sin_len; 110 u_char sin_family; 111 u_short sin_port; 112 struct in_addr sin_addr; 113 struct in_addr sin_srcaddr; 114 u_short sin_tos; 115 u_short sin_other; 116 #define SIN_PROXY 1 117 }; 118 /* 119 * IP and ethernet specific routing flags 120 */ 121 #define RTF_USETRAILERS RTF_PROTO1 /* use trailers */ 122 #define RTF_ANNOUNCE RTF_PROTO2 /* announce new arp entry */ 123 124 #ifdef KERNEL 125 u_char etherbroadcastaddr[6]; 126 #if defined(ISO) && !defined(MULTICAST) 127 #define MULTICAST 1 128 #endif 129 #ifdef MULTICAST 130 u_char ether_ipmulticast_min[6]; 131 u_char ether_ipmulticast_max[6]; 132 #endif 133 134 struct llinfo_arp *arptnew __P((struct in_addr *)); 135 struct llinfo_arp llinfo_arp; /* head of the llinfo queue */ 136 int ether_output __P((struct ifnet *, struct mbuf *, struct sockaddr *, 137 struct rtentry *)); 138 int ether_input __P((struct ifnet *, struct ether_header *, struct mbuf *)); 139 char *ether_sprintf __P((u_char *)); 140 void arp_rtrequest __P((int, struct rtentry *, struct sockaddr *)); 141 struct ifqueue arpintrq; 142 143 /* XXX These probably belong elsewhere */ 144 void in_arpinput __P((struct mbuf *)); 145 void arpwhohas __P((struct arpcom *, struct in_addr *)); 146 147 #ifdef MULTICAST 148 /* 149 * Ethernet multicast address structure. There is one of these for each 150 * multicast address or range of multicast addresses that we are supposed 151 * to listen to on a particular interface. They are kept in a linked list, 152 * rooted in the interface's arpcom structure. (This really has nothing to 153 * do with ARP, or with the Internet address family, but this appears to be 154 * the minimally-disrupting place to put it.) 155 */ 156 struct ether_multi { 157 u_char enm_addrlo[6]; /* low or only address of range */ 158 u_char enm_addrhi[6]; /* high or only address of range */ 159 struct arpcom *enm_ac; /* back pointer to arpcom */ 160 u_int enm_refcount; /* no. claims to this addr/range */ 161 struct ether_multi *enm_next; /* ptr to next ether_multi */ 162 }; 163 164 #ifdef KERNEL 165 /* 166 * Structure used by macros below to remember position when stepping through 167 * all of the ether_multi records. 168 */ 169 struct ether_multistep { 170 struct ether_multi *e_enm; 171 }; 172 173 /* 174 * Macro for looking up the ether_multi record for a given range of Ethernet 175 * multicast addresses connected to a given arpcom structure. If no matching 176 * record is found, "enm" returns NULL. 177 */ 178 #define ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm) \ 179 /* u_char addrlo[6]; */ \ 180 /* u_char addrhi[6]; */ \ 181 /* struct arpcom *ac; */ \ 182 /* struct ether_multi *enm; */ \ 183 { \ 184 for ((enm) = (ac)->ac_multiaddrs; \ 185 (enm) != NULL && \ 186 (bcmp((enm)->enm_addrlo, (addrlo), 6) != 0 || \ 187 bcmp((enm)->enm_addrhi, (addrhi), 6) != 0); \ 188 (enm) = (enm)->enm_next); \ 189 } 190 191 /* 192 * Macro to step through all of the ether_multi records, one at a time. 193 * The current position is remembered in "step", which the caller must 194 * provide. ETHER_FIRST_MULTI(), below, must be called to initialize "step" 195 * and get the first record. Both macros return a NULL "enm" when there 196 * are no remaining records. 197 */ 198 #define ETHER_NEXT_MULTI(step, enm) \ 199 /* struct ether_multistep step; */ \ 200 /* struct ether_multi *enm; */ \ 201 { \ 202 if (((enm) = (step).e_enm) != NULL) \ 203 (step).e_enm = (enm)->enm_next; \ 204 } 205 206 #define ETHER_FIRST_MULTI(step, ac, enm) \ 207 /* struct ether_multistep step; */ \ 208 /* struct arpcom *ac; */ \ 209 /* struct ether_multi *enm; */ \ 210 { \ 211 (step).e_enm = (ac)->ac_multiaddrs; \ 212 ETHER_NEXT_MULTI((step), (enm)); \ 213 } 214 #endif 215 #endif 216 #endif 217