source: UsbWattMeter/trunk/lwip-1.4.1/src/include/netif/etharp.h@ 167

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[164]1/*
2 * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
3 * Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
4 * Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without modification,
8 * are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright notice,
13 * this list of conditions and the following disclaimer in the documentation
14 * and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
19 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
20 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
21 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
23 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
26 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
27 * OF SUCH DAMAGE.
28 *
29 * This file is part of the lwIP TCP/IP stack.
30 *
31 * Author: Adam Dunkels <adam@sics.se>
32 *
33 */
34
35#ifndef __NETIF_ETHARP_H__
36#define __NETIF_ETHARP_H__
37
38#include "lwip/opt.h"
39
40#if LWIP_ARP || LWIP_ETHERNET /* don't build if not configured for use in lwipopts.h */
41
42#include "lwip/pbuf.h"
43#include "lwip/ip_addr.h"
44#include "lwip/netif.h"
45#include "lwip/ip.h"
46
47#ifdef __cplusplus
48extern "C" {
49#endif
50
51#ifndef ETHARP_HWADDR_LEN
52#define ETHARP_HWADDR_LEN 6
53#endif
54
55#ifdef PACK_STRUCT_USE_INCLUDES
56# include "arch/bpstruct.h"
57#endif
58PACK_STRUCT_BEGIN
59struct eth_addr {
60 PACK_STRUCT_FIELD(u8_t addr[ETHARP_HWADDR_LEN]);
61} PACK_STRUCT_STRUCT;
62PACK_STRUCT_END
63#ifdef PACK_STRUCT_USE_INCLUDES
64# include "arch/epstruct.h"
65#endif
66
67#ifdef PACK_STRUCT_USE_INCLUDES
68# include "arch/bpstruct.h"
69#endif
70PACK_STRUCT_BEGIN
71/** Ethernet header */
72struct eth_hdr {
73#if ETH_PAD_SIZE
74 PACK_STRUCT_FIELD(u8_t padding[ETH_PAD_SIZE]);
75#endif
76 PACK_STRUCT_FIELD(struct eth_addr dest);
77 PACK_STRUCT_FIELD(struct eth_addr src);
78 PACK_STRUCT_FIELD(u16_t type);
79} PACK_STRUCT_STRUCT;
80PACK_STRUCT_END
81#ifdef PACK_STRUCT_USE_INCLUDES
82# include "arch/epstruct.h"
83#endif
84
85#define SIZEOF_ETH_HDR (14 + ETH_PAD_SIZE)
86
87#if ETHARP_SUPPORT_VLAN
88
89#ifdef PACK_STRUCT_USE_INCLUDES
90# include "arch/bpstruct.h"
91#endif
92PACK_STRUCT_BEGIN
93/** VLAN header inserted between ethernet header and payload
94 * if 'type' in ethernet header is ETHTYPE_VLAN.
95 * See IEEE802.Q */
96struct eth_vlan_hdr {
97 PACK_STRUCT_FIELD(u16_t prio_vid);
98 PACK_STRUCT_FIELD(u16_t tpid);
99} PACK_STRUCT_STRUCT;
100PACK_STRUCT_END
101#ifdef PACK_STRUCT_USE_INCLUDES
102# include "arch/epstruct.h"
103#endif
104
105#define SIZEOF_VLAN_HDR 4
106#define VLAN_ID(vlan_hdr) (htons((vlan_hdr)->prio_vid) & 0xFFF)
107
108#endif /* ETHARP_SUPPORT_VLAN */
109
110#ifdef PACK_STRUCT_USE_INCLUDES
111# include "arch/bpstruct.h"
112#endif
113PACK_STRUCT_BEGIN
114/** the ARP message, see RFC 826 ("Packet format") */
115struct etharp_hdr {
116 PACK_STRUCT_FIELD(u16_t hwtype);
117 PACK_STRUCT_FIELD(u16_t proto);
118 PACK_STRUCT_FIELD(u8_t hwlen);
119 PACK_STRUCT_FIELD(u8_t protolen);
120 PACK_STRUCT_FIELD(u16_t opcode);
121 PACK_STRUCT_FIELD(struct eth_addr shwaddr);
122 PACK_STRUCT_FIELD(struct ip_addr2 sipaddr);
123 PACK_STRUCT_FIELD(struct eth_addr dhwaddr);
124 PACK_STRUCT_FIELD(struct ip_addr2 dipaddr);
125} PACK_STRUCT_STRUCT;
126PACK_STRUCT_END
127#ifdef PACK_STRUCT_USE_INCLUDES
128# include "arch/epstruct.h"
129#endif
130
131#define SIZEOF_ETHARP_HDR 28
132#define SIZEOF_ETHARP_PACKET (SIZEOF_ETH_HDR + SIZEOF_ETHARP_HDR)
133
134/** 5 seconds period */
135#define ARP_TMR_INTERVAL 5000
136
137#define ETHTYPE_ARP 0x0806U
138#define ETHTYPE_IP 0x0800U
139#define ETHTYPE_VLAN 0x8100U
140#define ETHTYPE_PPPOEDISC 0x8863U /* PPP Over Ethernet Discovery Stage */
141#define ETHTYPE_PPPOE 0x8864U /* PPP Over Ethernet Session Stage */
142
143/** MEMCPY-like macro to copy to/from struct eth_addr's that are local variables
144 * or known to be 32-bit aligned within the protocol header. */
145#ifndef ETHADDR32_COPY
146#define ETHADDR32_COPY(src, dst) SMEMCPY(src, dst, ETHARP_HWADDR_LEN)
147#endif
148
149/** MEMCPY-like macro to copy to/from struct eth_addr's that are no local
150 * variables and known to be 16-bit aligned within the protocol header. */
151#ifndef ETHADDR16_COPY
152#define ETHADDR16_COPY(src, dst) SMEMCPY(src, dst, ETHARP_HWADDR_LEN)
153#endif
154
155#if LWIP_ARP /* don't build if not configured for use in lwipopts.h */
156
157/** ARP message types (opcodes) */
158#define ARP_REQUEST 1
159#define ARP_REPLY 2
160
161/** Define this to 1 and define LWIP_ARP_FILTER_NETIF_FN(pbuf, netif, type)
162 * to a filter function that returns the correct netif when using multiple
163 * netifs on one hardware interface where the netif's low-level receive
164 * routine cannot decide for the correct netif (e.g. when mapping multiple
165 * IP addresses to one hardware interface).
166 */
167#ifndef LWIP_ARP_FILTER_NETIF
168#define LWIP_ARP_FILTER_NETIF 0
169#endif
170
171#if ARP_QUEUEING
172/** struct for queueing outgoing packets for unknown address
173 * defined here to be accessed by memp.h
174 */
175struct etharp_q_entry {
176 struct etharp_q_entry *next;
177 struct pbuf *p;
178};
179#endif /* ARP_QUEUEING */
180
181#define etharp_init() /* Compatibility define, not init needed. */
182void etharp_tmr(void);
183s8_t etharp_find_addr(struct netif *netif, ip_addr_t *ipaddr,
184 struct eth_addr **eth_ret, ip_addr_t **ip_ret);
185err_t etharp_output(struct netif *netif, struct pbuf *q, ip_addr_t *ipaddr);
186err_t etharp_query(struct netif *netif, ip_addr_t *ipaddr, struct pbuf *q);
187err_t etharp_request(struct netif *netif, ip_addr_t *ipaddr);
188/** For Ethernet network interfaces, we might want to send "gratuitous ARP";
189 * this is an ARP packet sent by a node in order to spontaneously cause other
190 * nodes to update an entry in their ARP cache.
191 * From RFC 3220 "IP Mobility Support for IPv4" section 4.6. */
192#define etharp_gratuitous(netif) etharp_request((netif), &(netif)->ip_addr)
193void etharp_cleanup_netif(struct netif *netif);
194
195#if ETHARP_SUPPORT_STATIC_ENTRIES
196err_t etharp_add_static_entry(ip_addr_t *ipaddr, struct eth_addr *ethaddr);
197err_t etharp_remove_static_entry(ip_addr_t *ipaddr);
198#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
199
200#if LWIP_AUTOIP
201err_t etharp_raw(struct netif *netif, const struct eth_addr *ethsrc_addr,
202 const struct eth_addr *ethdst_addr,
203 const struct eth_addr *hwsrc_addr, const ip_addr_t *ipsrc_addr,
204 const struct eth_addr *hwdst_addr, const ip_addr_t *ipdst_addr,
205 const u16_t opcode);
206#endif /* LWIP_AUTOIP */
207
208#endif /* LWIP_ARP */
209
210err_t ethernet_input(struct pbuf *p, struct netif *netif);
211
212#define eth_addr_cmp(addr1, addr2) (memcmp((addr1)->addr, (addr2)->addr, ETHARP_HWADDR_LEN) == 0)
213
214extern const struct eth_addr ethbroadcast, ethzero;
215
216#endif /* LWIP_ARP || LWIP_ETHERNET */
217
218#ifdef __cplusplus
219}
220#endif
221
222#endif /* __NETIF_ARP_H__ */
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