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Annotation of 43BSD/sys/netinet/if_ether.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)if_ether.h  7.1 (Berkeley) 6/5/86
        !             7:  */
        !             8: 
        !             9: /*
        !            10:  * Structure of a 10Mb/s Ethernet header.
        !            11:  */
        !            12: struct ether_header {
        !            13:        u_char  ether_dhost[6];
        !            14:        u_char  ether_shost[6];
        !            15:        u_short ether_type;
        !            16: };
        !            17: 
        !            18: #define        ETHERTYPE_PUP   0x0200          /* PUP protocol */
        !            19: #define        ETHERTYPE_IP    0x0800          /* IP protocol */
        !            20: #define ETHERTYPE_ARP  0x0806          /* Addr. resolution protocol */
        !            21: 
        !            22: /*
        !            23:  * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
        !            24:  * (type-ETHERTYPE_TRAIL)*512 bytes of data followed
        !            25:  * by an ETHER type (as given above) and then the (variable-length) header.
        !            26:  */
        !            27: #define        ETHERTYPE_TRAIL         0x1000          /* Trailer packet */
        !            28: #define        ETHERTYPE_NTRAILER      16
        !            29: 
        !            30: #define        ETHERMTU        1500
        !            31: #define        ETHERMIN        (60-14)
        !            32: 
        !            33: /*
        !            34:  * Ethernet Address Resolution Protocol.
        !            35:  *
        !            36:  * See RFC 826 for protocol description.  Structure below is adapted
        !            37:  * to resolving internet addresses.  Field names used correspond to 
        !            38:  * RFC 826.
        !            39:  */
        !            40: struct ether_arp {
        !            41:        struct  arphdr ea_hdr;  /* fixed-size header */
        !            42:        u_char  arp_sha[6];     /* sender hardware address */
        !            43:        u_char  arp_spa[4];     /* sender protocol address */
        !            44:        u_char  arp_tha[6];     /* target hardware address */
        !            45:        u_char  arp_tpa[4];     /* target protocol address */
        !            46: };
        !            47: #define        arp_hrd ea_hdr.ar_hrd
        !            48: #define        arp_pro ea_hdr.ar_pro
        !            49: #define        arp_hln ea_hdr.ar_hln
        !            50: #define        arp_pln ea_hdr.ar_pln
        !            51: #define        arp_op  ea_hdr.ar_op
        !            52: 
        !            53: 
        !            54: /*
        !            55:  * Structure shared between the ethernet driver modules and
        !            56:  * the address resolution code.  For example, each ec_softc or il_softc
        !            57:  * begins with this structure.
        !            58:  */
        !            59: struct arpcom {
        !            60:        struct  ifnet ac_if;            /* network-visible interface */
        !            61:        u_char  ac_enaddr[6];           /* ethernet hardware address */
        !            62:        struct in_addr ac_ipaddr;       /* copy of ip address- XXX */
        !            63: };
        !            64: 
        !            65: /*
        !            66:  * Internet to ethernet address resolution table.
        !            67:  */
        !            68: struct arptab {
        !            69:        struct  in_addr at_iaddr;       /* internet address */
        !            70:        u_char  at_enaddr[6];           /* ethernet address */
        !            71:        u_char  at_timer;               /* minutes since last reference */
        !            72:        u_char  at_flags;               /* flags */
        !            73:        struct  mbuf *at_hold;          /* last packet until resolved/timeout */
        !            74: };
        !            75: 
        !            76: #ifdef KERNEL
        !            77: u_char etherbroadcastaddr[6];
        !            78: struct arptab *arptnew();
        !            79: char *ether_sprintf();
        !            80: #endif

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