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Annotation of XNU/bsd/net/ethernet.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:  * Fundamental constants relating to ethernet.
        !            24:  *
        !            25:  */
        !            26: 
        !            27: #ifndef _NET_ETHERNET_H_
        !            28: #define _NET_ETHERNET_H_
        !            29: 
        !            30: /*
        !            31:  * The number of bytes in an ethernet (MAC) address.
        !            32:  */
        !            33: #define        ETHER_ADDR_LEN          6
        !            34: 
        !            35: /*
        !            36:  * The number of bytes in the type field.
        !            37:  */
        !            38: #define        ETHER_TYPE_LEN          2
        !            39: 
        !            40: /*
        !            41:  * The number of bytes in the trailing CRC field.
        !            42:  */
        !            43: #define        ETHER_CRC_LEN           4
        !            44: 
        !            45: /*
        !            46:  * The length of the combined header.
        !            47:  */
        !            48: #define        ETHER_HDR_LEN           (ETHER_ADDR_LEN*2+ETHER_TYPE_LEN)
        !            49: 
        !            50: /*
        !            51:  * The minimum packet length.
        !            52:  */
        !            53: #define        ETHER_MIN_LEN           64
        !            54: 
        !            55: /*
        !            56:  * The maximum packet length.
        !            57:  */
        !            58: #define        ETHER_MAX_LEN           1518
        !            59: 
        !            60: /*
        !            61:  * A macro to validate a length with
        !            62:  */
        !            63: #define        ETHER_IS_VALID_LEN(foo) \
        !            64:        ((foo) >= ETHER_MIN_LEN && (foo) <= ETHER_MAX_LEN)
        !            65: 
        !            66: /*
        !            67:  * Structure of a 10Mb/s Ethernet header.
        !            68:  */
        !            69: struct ether_header {
        !            70:        u_char  ether_dhost[ETHER_ADDR_LEN];
        !            71:        u_char  ether_shost[ETHER_ADDR_LEN];
        !            72:        u_short ether_type;
        !            73: };
        !            74: 
        !            75: /*
        !            76:  * Structure of a 48-bit Ethernet address.
        !            77:  */
        !            78: struct ether_addr {
        !            79:        u_char octet[ETHER_ADDR_LEN];
        !            80: };
        !            81: 
        !            82: #define ether_addr_octet octet
        !            83: 
        !            84: #define        ETHERTYPE_PUP           0x0200  /* PUP protocol */
        !            85: #define        ETHERTYPE_IP            0x0800  /* IP protocol */
        !            86: #define ETHERTYPE_ARP          0x0806  /* Addr. resolution protocol */
        !            87: #define ETHERTYPE_REVARP       0x8035  /* reverse Addr. resolution protocol */
        !            88: #define        ETHERTYPE_VLAN          0x8100 /* IEEE 802.1Q VLAN tagging */
        !            89: #define        ETHERTYPE_LOOPBACK      0x9000  /* used to test interfaces */
        !            90: /* XXX - add more useful types here */
        !            91: 
        !            92: /*
        !            93:  * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
        !            94:  * (type-ETHERTYPE_TRAIL)*512 bytes of data followed
        !            95:  * by an ETHER type (as given above) and then the (variable-length) header.
        !            96:  */
        !            97: #define        ETHERTYPE_TRAIL         0x1000          /* Trailer packet */
        !            98: #define        ETHERTYPE_NTRAILER      16
        !            99: 
        !           100: #define        ETHERMTU        (ETHER_MAX_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN)
        !           101: #define        ETHERMIN        (ETHER_MIN_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN)
        !           102: 
        !           103: #if KERNEL
        !           104: struct ether_addr *ether_aton __P((char *));
        !           105: #endif
        !           106: 
        !           107: #if !KERNEL
        !           108: #include <sys/cdefs.h>
        !           109: 
        !           110: /*
        !           111:  * Ethernet address conversion/parsing routines.
        !           112:  */
        !           113: __BEGIN_DECLS
        !           114: 
        !           115: int    ether_hostton __P((char *, struct ether_addr *));
        !           116: int    ether_line __P((char *, struct ether_addr *, char *));
        !           117: char   *ether_ntoa __P((struct ether_addr *));
        !           118: int    ether_ntohost __P((char *, struct ether_addr *));
        !           119: __END_DECLS
        !           120: #endif /* !KERNEL */
        !           121: 
        !           122: #endif /* !_NET_ETHERNET_H_ */

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