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 7.5 (Berkeley) 06/28/90 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 23 /* 24 * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have 25 * (type-ETHERTYPE_TRAIL)*512 bytes of data followed 26 * by an ETHER type (as given above) and then the (variable-length) header. 27 */ 28 #define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */ 29 #define ETHERTYPE_NTRAILER 16 30 31 #define ETHERMTU 1500 32 #define ETHERMIN (60-14) 33 34 /* 35 * Ethernet Address Resolution Protocol. 36 * 37 * See RFC 826 for protocol description. Structure below is adapted 38 * to resolving internet addresses. Field names used correspond to 39 * RFC 826. 40 */ 41 struct ether_arp { 42 struct arphdr ea_hdr; /* fixed-size header */ 43 u_char arp_sha[6]; /* sender hardware address */ 44 u_char arp_spa[4]; /* sender protocol address */ 45 u_char arp_tha[6]; /* target hardware address */ 46 u_char arp_tpa[4]; /* target protocol address */ 47 }; 48 #define arp_hrd ea_hdr.ar_hrd 49 #define arp_pro ea_hdr.ar_pro 50 #define arp_hln ea_hdr.ar_hln 51 #define arp_pln ea_hdr.ar_pln 52 #define arp_op ea_hdr.ar_op 53 54 55 /* 56 * Structure shared between the ethernet driver modules and 57 * the address resolution code. For example, each ec_softc or il_softc 58 * begins with this structure. 59 */ 60 struct arpcom { 61 struct ifnet ac_if; /* network-visible interface */ 62 u_char ac_enaddr[6]; /* ethernet hardware address */ 63 struct in_addr ac_ipaddr; /* copy of ip address- XXX */ 64 }; 65 66 /* 67 * Internet to ethernet address resolution table. 68 */ 69 struct arptab { 70 struct in_addr at_iaddr; /* internet address */ 71 u_char at_enaddr[6]; /* ethernet address */ 72 u_char at_timer; /* minutes since last reference */ 73 u_char at_flags; /* flags */ 74 struct mbuf *at_hold; /* last packet until resolved/timeout */ 75 }; 76 77 #ifdef KERNEL 78 u_char etherbroadcastaddr[6]; 79 struct arptab *arptnew(); 80 int ether_output(), ether_input(); 81 char *ether_sprintf(); 82 #endif 83