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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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