1 /* if_ether.h 6.4 85/04/16 */ 2 3 /* 4 * Structure of a 10Mb/s Ethernet header. 5 */ 6 struct ether_header { 7 u_char ether_dhost[6]; 8 u_char ether_shost[6]; 9 u_short ether_type; 10 }; 11 12 #define ETHERTYPE_PUP 0x0200 /* PUP protocol */ 13 #define ETHERTYPE_IP 0x0800 /* IP protocol */ 14 #define ETHERTYPE_ARP 0x0806 /* Addr. resolution protocol */ 15 16 /* 17 * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have 18 * (type-ETHERPUP_TRAIL)*512 bytes of data followed 19 * by a PUP type (as given above) and then the (variable-length) header. 20 */ 21 #define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */ 22 #define ETHERTYPE_NTRAILER 16 23 24 #define ETHERMTU 1500 25 #define ETHERMIN (60-14) 26 27 /* 28 * Ethernet Address Resolution Protocol. 29 * 30 * See RFC 826 for protocol description. Structure below is adapted 31 * to resolving internet addresses. Field names used correspond to 32 * RFC 826. 33 */ 34 struct ether_arp { 35 u_short arp_hrd; /* format of hardware address */ 36 #define ARPHRD_ETHER 1 /* ethernet hardware address */ 37 u_short arp_pro; /* format of proto. address (ETHERPUP_IPTYPE) */ 38 u_char arp_hln; /* length of hardware address (6) */ 39 u_char arp_pln; /* length of protocol address (4) */ 40 u_short arp_op; 41 #define ARPOP_REQUEST 1 /* request to resolve address */ 42 #define ARPOP_REPLY 2 /* response to previous request */ 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 49 /* 50 * Structure shared between the ethernet driver modules and 51 * the address resolution code. For example, each ec_softc or il_softc 52 * begins with this structure. 53 */ 54 struct arpcom { 55 struct ifnet ac_if; /* network-visible interface */ 56 u_char ac_enaddr[6]; /* ethernet hardware address */ 57 struct in_addr ac_ipaddr; /* copy of ip address- XXX */ 58 }; 59 60 /* 61 * Internet to ethernet address resolution table. 62 */ 63 struct arptab { 64 struct in_addr at_iaddr; /* internet address */ 65 u_char at_enaddr[6]; /* ethernet address */ 66 struct mbuf *at_hold; /* last packet until resolved/timeout */ 67 u_char at_timer; /* minutes since last reference */ 68 u_char at_flags; /* flags */ 69 }; 70 71 #ifdef KERNEL 72 u_char etherbroadcastaddr[6]; 73 struct arptab *arptnew(); 74 #endif 75