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Annotation of Net2/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.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)if_ether.h  7.5 (Berkeley) 6/28/90
        !            34:  */
        !            35: 
        !            36: /*
        !            37:  * Structure of a 10Mb/s Ethernet header.
        !            38:  */
        !            39: struct ether_header {
        !            40:        u_char  ether_dhost[6];
        !            41:        u_char  ether_shost[6];
        !            42:        u_short ether_type;
        !            43: };
        !            44: 
        !            45: #define        ETHERTYPE_PUP   0x0200          /* PUP protocol */
        !            46: #define        ETHERTYPE_IP    0x0800          /* IP protocol */
        !            47: #define ETHERTYPE_ARP  0x0806          /* Addr. resolution protocol */
        !            48: 
        !            49: /*
        !            50:  * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
        !            51:  * (type-ETHERTYPE_TRAIL)*512 bytes of data followed
        !            52:  * by an ETHER type (as given above) and then the (variable-length) header.
        !            53:  */
        !            54: #define        ETHERTYPE_TRAIL         0x1000          /* Trailer packet */
        !            55: #define        ETHERTYPE_NTRAILER      16
        !            56: 
        !            57: #define        ETHERMTU        1500
        !            58: #define        ETHERMIN        (60-14)
        !            59: 
        !            60: /*
        !            61:  * Ethernet Address Resolution Protocol.
        !            62:  *
        !            63:  * See RFC 826 for protocol description.  Structure below is adapted
        !            64:  * to resolving internet addresses.  Field names used correspond to 
        !            65:  * RFC 826.
        !            66:  */
        !            67: struct ether_arp {
        !            68:        struct  arphdr ea_hdr;  /* fixed-size header */
        !            69:        u_char  arp_sha[6];     /* sender hardware address */
        !            70:        u_char  arp_spa[4];     /* sender protocol address */
        !            71:        u_char  arp_tha[6];     /* target hardware address */
        !            72:        u_char  arp_tpa[4];     /* target protocol address */
        !            73: };
        !            74: #define        arp_hrd ea_hdr.ar_hrd
        !            75: #define        arp_pro ea_hdr.ar_pro
        !            76: #define        arp_hln ea_hdr.ar_hln
        !            77: #define        arp_pln ea_hdr.ar_pln
        !            78: #define        arp_op  ea_hdr.ar_op
        !            79: 
        !            80: 
        !            81: /*
        !            82:  * Structure shared between the ethernet driver modules and
        !            83:  * the address resolution code.  For example, each ec_softc or il_softc
        !            84:  * begins with this structure.
        !            85:  */
        !            86: struct arpcom {
        !            87:        struct  ifnet ac_if;            /* network-visible interface */
        !            88:        u_char  ac_enaddr[6];           /* ethernet hardware address */
        !            89:        struct in_addr ac_ipaddr;       /* copy of ip address- XXX */
        !            90: };
        !            91: 
        !            92: /*
        !            93:  * Internet to ethernet address resolution table.
        !            94:  */
        !            95: struct arptab {
        !            96:        struct  in_addr at_iaddr;       /* internet address */
        !            97:        u_char  at_enaddr[6];           /* ethernet address */
        !            98:        u_char  at_timer;               /* minutes since last reference */
        !            99:        u_char  at_flags;               /* flags */
        !           100:        struct  mbuf *at_hold;          /* last packet until resolved/timeout */
        !           101: };
        !           102: 
        !           103: #ifdef KERNEL
        !           104: u_char etherbroadcastaddr[6];
        !           105: struct arptab *arptnew();
        !           106: int    ether_output(), ether_input();
        !           107: char   *ether_sprintf();
        !           108: #endif

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