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Annotation of 43BSDReno/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.
                      4:  *
                      5:  * Redistribution is only permitted until one year after the first shipment
                      6:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
                      7:  * binary forms are permitted provided that: (1) source distributions retain
                      8:  * this entire copyright notice and comment, and (2) distributions including
                      9:  * binaries display the following acknowledgement:  This product includes
                     10:  * software developed by the University of California, Berkeley and its
                     11:  * contributors'' in the documentation or other materials provided with the
                     12:  * distribution and in all advertising materials mentioning features or use
                     13:  * of this software.  Neither the name of the University nor the names of
                     14:  * its contributors may be used to endorse or promote products derived from
                     15:  * this software without specific prior written permission.
                     16:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
                     17:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
                     18:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     19:  *
                     20:  *     @(#)if_ether.h  7.5 (Berkeley) 6/28/90
                     21:  */
                     22: 
                     23: /*
                     24:  * Structure of a 10Mb/s Ethernet header.
                     25:  */
                     26: struct ether_header {
                     27:        u_char  ether_dhost[6];
                     28:        u_char  ether_shost[6];
                     29:        u_short ether_type;
                     30: };
                     31: 
                     32: #define        ETHERTYPE_PUP   0x0200          /* PUP protocol */
                     33: #define        ETHERTYPE_IP    0x0800          /* IP protocol */
                     34: #define ETHERTYPE_ARP  0x0806          /* Addr. resolution protocol */
                     35: 
                     36: /*
                     37:  * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
                     38:  * (type-ETHERTYPE_TRAIL)*512 bytes of data followed
                     39:  * by an ETHER type (as given above) and then the (variable-length) header.
                     40:  */
                     41: #define        ETHERTYPE_TRAIL         0x1000          /* Trailer packet */
                     42: #define        ETHERTYPE_NTRAILER      16
                     43: 
                     44: #define        ETHERMTU        1500
                     45: #define        ETHERMIN        (60-14)
                     46: 
                     47: /*
                     48:  * Ethernet Address Resolution Protocol.
                     49:  *
                     50:  * See RFC 826 for protocol description.  Structure below is adapted
                     51:  * to resolving internet addresses.  Field names used correspond to 
                     52:  * RFC 826.
                     53:  */
                     54: struct ether_arp {
                     55:        struct  arphdr ea_hdr;  /* fixed-size header */
                     56:        u_char  arp_sha[6];     /* sender hardware address */
                     57:        u_char  arp_spa[4];     /* sender protocol address */
                     58:        u_char  arp_tha[6];     /* target hardware address */
                     59:        u_char  arp_tpa[4];     /* target protocol address */
                     60: };
                     61: #define        arp_hrd ea_hdr.ar_hrd
                     62: #define        arp_pro ea_hdr.ar_pro
                     63: #define        arp_hln ea_hdr.ar_hln
                     64: #define        arp_pln ea_hdr.ar_pln
                     65: #define        arp_op  ea_hdr.ar_op
                     66: 
                     67: 
                     68: /*
                     69:  * Structure shared between the ethernet driver modules and
                     70:  * the address resolution code.  For example, each ec_softc or il_softc
                     71:  * begins with this structure.
                     72:  */
                     73: struct arpcom {
                     74:        struct  ifnet ac_if;            /* network-visible interface */
                     75:        u_char  ac_enaddr[6];           /* ethernet hardware address */
                     76:        struct in_addr ac_ipaddr;       /* copy of ip address- XXX */
                     77: };
                     78: 
                     79: /*
                     80:  * Internet to ethernet address resolution table.
                     81:  */
                     82: struct arptab {
                     83:        struct  in_addr at_iaddr;       /* internet address */
                     84:        u_char  at_enaddr[6];           /* ethernet address */
                     85:        u_char  at_timer;               /* minutes since last reference */
                     86:        u_char  at_flags;               /* flags */
                     87:        struct  mbuf *at_hold;          /* last packet until resolved/timeout */
                     88: };
                     89: 
                     90: #ifdef KERNEL
                     91: u_char etherbroadcastaddr[6];
                     92: struct arptab *arptnew();
                     93: int    ether_output(), ether_input();
                     94: char   *ether_sprintf();
                     95: #endif

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