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1 office 1 /**
2 * @file
3 * Ethernet protocol definitions
4 */
5  
6 /*
7 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without modification,
11 * are permitted provided that the following conditions are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright notice,
14 * this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright notice,
16 * this list of conditions and the following disclaimer in the documentation
17 * and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
24 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
26 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
29 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
30 * OF SUCH DAMAGE.
31 *
32 * This file is part of the lwIP TCP/IP stack.
33 *
34 * Author: Adam Dunkels <adam@sics.se>
35 *
36 */
37 #ifndef LWIP_HDR_PROT_ETHERNET_H
38 #define LWIP_HDR_PROT_ETHERNET_H
39  
40 #include "lwip/arch.h"
41 #include "lwip/prot/ieee.h"
42  
43 #ifdef __cplusplus
44 extern "C" {
45 #endif
46  
47 #ifndef ETH_HWADDR_LEN
48 #ifdef ETHARP_HWADDR_LEN
49 #define ETH_HWADDR_LEN ETHARP_HWADDR_LEN /* compatibility mode */
50 #else
51 #define ETH_HWADDR_LEN 6
52 #endif
53 #endif
54  
55 #ifdef PACK_STRUCT_USE_INCLUDES
56 # include "arch/bpstruct.h"
57 #endif
58 PACK_STRUCT_BEGIN
59 /** An Ethernet MAC address */
60 struct eth_addr {
61 PACK_STRUCT_FLD_8(u8_t addr[ETH_HWADDR_LEN]);
62 } PACK_STRUCT_STRUCT;
63 PACK_STRUCT_END
64 #ifdef PACK_STRUCT_USE_INCLUDES
65 # include "arch/epstruct.h"
66 #endif
67  
68 /** Initialize a struct eth_addr with its 6 bytes (takes care of correct braces) */
69 #define ETH_ADDR(b0, b1, b2, b3, b4, b5) {{b0, b1, b2, b3, b4, b5}}
70  
71 #ifdef PACK_STRUCT_USE_INCLUDES
72 # include "arch/bpstruct.h"
73 #endif
74 PACK_STRUCT_BEGIN
75 /** Ethernet header */
76 struct eth_hdr {
77 #if ETH_PAD_SIZE
78 PACK_STRUCT_FLD_8(u8_t padding[ETH_PAD_SIZE]);
79 #endif
80 PACK_STRUCT_FLD_S(struct eth_addr dest);
81 PACK_STRUCT_FLD_S(struct eth_addr src);
82 PACK_STRUCT_FIELD(u16_t type);
83 } PACK_STRUCT_STRUCT;
84 PACK_STRUCT_END
85 #ifdef PACK_STRUCT_USE_INCLUDES
86 # include "arch/epstruct.h"
87 #endif
88  
89 #define SIZEOF_ETH_HDR (14 + ETH_PAD_SIZE)
90  
91 #ifdef PACK_STRUCT_USE_INCLUDES
92 # include "arch/bpstruct.h"
93 #endif
94 PACK_STRUCT_BEGIN
95 /** VLAN header inserted between ethernet header and payload
96 * if 'type' in ethernet header is ETHTYPE_VLAN.
97 * See IEEE802.Q */
98 struct eth_vlan_hdr {
99 PACK_STRUCT_FIELD(u16_t prio_vid);
100 PACK_STRUCT_FIELD(u16_t tpid);
101 } PACK_STRUCT_STRUCT;
102 PACK_STRUCT_END
103 #ifdef PACK_STRUCT_USE_INCLUDES
104 # include "arch/epstruct.h"
105 #endif
106  
107 #define SIZEOF_VLAN_HDR 4
108 #define VLAN_ID(vlan_hdr) (lwip_htons((vlan_hdr)->prio_vid) & 0xFFF)
109  
110 /** The 24-bit IANA IPv4-multicast OUI is 01-00-5e: */
111 #define LL_IP4_MULTICAST_ADDR_0 0x01
112 #define LL_IP4_MULTICAST_ADDR_1 0x00
113 #define LL_IP4_MULTICAST_ADDR_2 0x5e
114  
115 /** IPv6 multicast uses this prefix */
116 #define LL_IP6_MULTICAST_ADDR_0 0x33
117 #define LL_IP6_MULTICAST_ADDR_1 0x33
118  
119 #define eth_addr_cmp(addr1, addr2) (memcmp((addr1)->addr, (addr2)->addr, ETH_HWADDR_LEN) == 0)
120  
121 #ifdef __cplusplus
122 }
123 #endif
124  
125 #endif /* LWIP_HDR_PROT_ETHERNET_H */