usr/src/sys/netinet/if_ether.h

/*
 * Copyright (c) 1982 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *      @(#)if_ether.h  6.7 (Berkeley) %G%
 */

/*
 * Structure of a 10Mb/s Ethernet header.
 */
struct  ether_header {
        u_char  ether_dhost[6];
        u_char  ether_shost[6];
        u_short ether_type;
};

#define ETHERTYPE_PUP   0x0200          /* PUP protocol */
#define ETHERTYPE_IP    0x0800          /* IP protocol */
#define ETHERTYPE_ARP   0x0806          /* Addr. resolution protocol */

/*
 * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
 * (type-ETHERTYPE_TRAIL)*512 bytes of data followed
 * by an ETHER type (as given above) and then the (variable-length) header.
 */
#define ETHERTYPE_TRAIL         0x1000          /* Trailer packet */
#define ETHERTYPE_NTRAILER      16

#define ETHERMTU        1500
#define ETHERMIN        (60-14)

/*
 * Ethernet Address Resolution Protocol.
 *
 * See RFC 826 for protocol description.  Structure below is adapted
 * to resolving internet addresses.  Field names used correspond to
 * RFC 826.
 */
struct  ether_arp {
        struct  arphdr ea_hdr;  /* fixed-size header */
        u_char  arp_sha[6];     /* sender hardware address */
        u_char  arp_spa[4];     /* sender protocol address */
        u_char  arp_tha[6];     /* target hardware address */
        u_char  arp_tpa[4];     /* target protocol address */
};
#define arp_hrd ea_hdr.ar_hrd
#define arp_pro ea_hdr.ar_pro
#define arp_hln ea_hdr.ar_hln
#define arp_pln ea_hdr.ar_pln
#define arp_op  ea_hdr.ar_op


/*
 * Structure shared between the ethernet driver modules and
 * the address resolution code.  For example, each ec_softc or il_softc
 * begins with this structure.
 */
struct  arpcom {
        struct  ifnet ac_if;            /* network-visible interface */
        u_char  ac_enaddr[6];           /* ethernet hardware address */
        struct in_addr ac_ipaddr;       /* copy of ip address- XXX */
};

/*
 * Internet to ethernet address resolution table.
 */
struct  arptab {
        struct  in_addr at_iaddr;       /* internet address */
        u_char  at_enaddr[6];           /* ethernet address */
        u_char  at_timer;               /* minutes since last reference */
        u_char  at_flags;               /* flags */
        struct  mbuf *at_hold;          /* last packet until resolved/timeout */
};

#ifdef  KERNEL
u_char etherbroadcastaddr[6];
struct  arptab *arptnew();
char *ether_sprintf();
#endif