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Annotation of 43BSD/sys/netinet/if_ether.h, revision 1.1.1.1

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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