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Annotation of XNU/bsd/net/if_arp.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * Copyright (c) 1986, 1993
        !            24:  *     The Regents of the University of California.  All rights reserved.
        !            25:  *
        !            26:  * Redistribution and use in source and binary forms, with or without
        !            27:  * modification, are permitted provided that the following conditions
        !            28:  * are met:
        !            29:  * 1. Redistributions of source code must retain the above copyright
        !            30:  *    notice, this list of conditions and the following disclaimer.
        !            31:  * 2. Redistributions in binary form must reproduce the above copyright
        !            32:  *    notice, this list of conditions and the following disclaimer in the
        !            33:  *    documentation and/or other materials provided with the distribution.
        !            34:  * 3. All advertising materials mentioning features or use of this software
        !            35:  *    must display the following acknowledgement:
        !            36:  *     This product includes software developed by the University of
        !            37:  *     California, Berkeley and its contributors.
        !            38:  * 4. Neither the name of the University nor the names of its contributors
        !            39:  *    may be used to endorse or promote products derived from this software
        !            40:  *    without specific prior written permission.
        !            41:  *
        !            42:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            43:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            44:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            45:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            46:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            47:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            48:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            49:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            50:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            51:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            52:  * SUCH DAMAGE.
        !            53:  *
        !            54:  *     @(#)if_arp.h    8.1 (Berkeley) 6/10/93
        !            55:  */
        !            56: 
        !            57: #ifndef _NET_IF_ARP_H_
        !            58: #define        _NET_IF_ARP_H_
        !            59: 
        !            60: /*
        !            61:  * Address Resolution Protocol.
        !            62:  *
        !            63:  * See RFC 826 for protocol description.  ARP packets are variable
        !            64:  * in size; the arphdr structure defines the fixed-length portion.
        !            65:  * Protocol type values are the same as those for 10 Mb/s Ethernet.
        !            66:  * It is followed by the variable-sized fields ar_sha, arp_spa,
        !            67:  * arp_tha and arp_tpa in that order, according to the lengths
        !            68:  * specified.  Field names used correspond to RFC 826.
        !            69:  */
        !            70: struct arphdr {
        !            71:        u_short ar_hrd;         /* format of hardware address */
        !            72: #define ARPHRD_ETHER   1       /* ethernet hardware format */
        !            73: #define ARPHRD_FRELAY  15      /* frame relay hardware format */
        !            74:        u_short ar_pro;         /* format of protocol address */
        !            75:        u_char  ar_hln;         /* length of hardware address */
        !            76:        u_char  ar_pln;         /* length of protocol address */
        !            77:        u_short ar_op;          /* one of: */
        !            78: #define        ARPOP_REQUEST   1       /* request to resolve address */
        !            79: #define        ARPOP_REPLY     2       /* response to previous request */
        !            80: #define        ARPOP_REVREQUEST 3      /* request protocol address given hardware */
        !            81: #define        ARPOP_REVREPLY  4       /* response giving protocol address */
        !            82: #define ARPOP_INVREQUEST 8     /* request to identify peer */
        !            83: #define ARPOP_INVREPLY 9       /* response identifying peer */
        !            84: /*
        !            85:  * The remaining fields are variable in size,
        !            86:  * according to the sizes above.
        !            87:  */
        !            88: #ifdef COMMENT_ONLY
        !            89:        u_char  ar_sha[];       /* sender hardware address */
        !            90:        u_char  ar_spa[];       /* sender protocol address */
        !            91:        u_char  ar_tha[];       /* target hardware address */
        !            92:        u_char  ar_tpa[];       /* target protocol address */
        !            93: #endif
        !            94: };
        !            95: 
        !            96: /*
        !            97:  * ARP ioctl request
        !            98:  */
        !            99: struct arpreq {
        !           100:        struct  sockaddr arp_pa;                /* protocol address */
        !           101:        struct  sockaddr arp_ha;                /* hardware address */
        !           102:        int     arp_flags;                      /* flags */
        !           103: };
        !           104: /*  arp_flags and at_flags field values */
        !           105: #define        ATF_INUSE       0x01    /* entry in use */
        !           106: #define ATF_COM                0x02    /* completed entry (enaddr valid) */
        !           107: #define        ATF_PERM        0x04    /* permanent entry */
        !           108: #define        ATF_PUBL        0x08    /* publish entry (respond for other host) */
        !           109: #define        ATF_USETRAILERS 0x10    /* has requested trailers */
        !           110: 
        !           111: 
        !           112: /*
        !           113:  * Ethernet multicast address structure.  There is one of these for each
        !           114:  * multicast address or range of multicast addresses that we are supposed
        !           115:  * to listen to on a particular interface.  They are kept in a linked list,
        !           116:  * rooted in the interface's arpcom structure.  (This really has nothing to
        !           117:  * do with ARP, or with the Internet address family, but this appears to be
        !           118:  * the minimally-disrupting place to put it.)
        !           119:  */
        !           120: struct ether_multi {
        !           121:        u_char  enm_addrlo[6];          /* low  or only address of range */
        !           122:        u_char  enm_addrhi[6];          /* high or only address of range */
        !           123:        struct  arpcom *enm_ac;         /* back pointer to arpcom */
        !           124:        u_int   enm_refcount;           /* no. claims to this addr/range */
        !           125:        struct  ether_multi *enm_next;  /* ptr to next ether_multi */
        !           126: };
        !           127: 
        !           128: /*
        !           129:  * Structure used by macros below to remember position when stepping through
        !           130:  * all of the ether_multi records.
        !           131:  */
        !           132: struct ether_multistep {
        !           133:        struct ether_multi  *e_enm;
        !           134: };
        !           135: 
        !           136: #ifdef KERNEL
        !           137: /*
        !           138:  * Structure shared between the ethernet driver modules and
        !           139:  * the address resolution code.  For example, each ec_softc or il_softc
        !           140:  * begins with this structure.
        !           141:  */
        !           142: struct arpcom {
        !           143:        /*
        !           144:         * The ifnet struct _must_ be at the head of this structure.
        !           145:         */
        !           146:        struct  ifnet ac_if;            /* network-visible interface */
        !           147:        u_char  ac_enaddr[6];           /* ethernet hardware address */
        !           148:        struct  in_addr ac_ipaddr;      /* copy of ip address- XXX */
        !           149:        struct  ether_multi *ac_multiaddrs; /* list of ether multicast addrs */
        !           150:        int     ac_multicnt;            /* length of ac_multiaddrs list */
        !           151: };
        !           152: 
        !           153: extern u_char  etherbroadcastaddr[6];
        !           154: #endif
        !           155: 
        !           156: #endif /* !_NET_IF_ARP_H_ */

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