etharp.h

00001 /*
00002  * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
00003  * Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
00004  * Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
00005  * All rights reserved. 
00006  * 
00007  * Redistribution and use in source and binary forms, with or without modification, 
00008  * are permitted provided that the following conditions are met:
00009  *
00010  * 1. Redistributions of source code must retain the above copyright notice,
00011  *    this list of conditions and the following disclaimer.
00012  * 2. Redistributions in binary form must reproduce the above copyright notice,
00013  *    this list of conditions and the following disclaimer in the documentation
00014  *    and/or other materials provided with the distribution.
00015  * 3. The name of the author may not be used to endorse or promote products
00016  *    derived from this software without specific prior written permission. 
00017  *
00018  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 
00019  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
00020  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 
00021  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
00022  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 
00023  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
00024  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
00025  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 
00026  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
00027  * OF SUCH DAMAGE.
00028  *
00029  * This file is part of the lwIP TCP/IP stack.
00030  * 
00031  * Author: Adam Dunkels <adam@sics.se>
00032  *
00033  */
00034 
00035 #ifndef __NETIF_ETHARP_H__
00036 #define __NETIF_ETHARP_H__
00037 
00038 #include "lwip/opt.h"
00039 
00040 #if LWIP_ARP || LWIP_ETHERNET /* don't build if not configured for use in lwipopts.h */
00041 
00042 #include "lwip/pbuf.h"
00043 #include "lwip/ip_addr.h"
00044 #include "lwip/netif.h"
00045 #include "lwip/ip.h"
00046 
00047 #ifdef __cplusplus
00048 extern "C" {
00049 #endif
00050 
00051 #ifndef ETHARP_HWADDR_LEN
00052 #define ETHARP_HWADDR_LEN     6
00053 #endif
00054 
00055 #ifdef PACK_STRUCT_USE_INCLUDES
00056 #  include "arch/bpstruct.h"
00057 #endif
00058 PACK_STRUCT_BEGIN
00059 struct eth_addr {
00060   PACK_STRUCT_FIELD(u8_t addr[ETHARP_HWADDR_LEN]);
00061 } PACK_STRUCT_STRUCT;
00062 PACK_STRUCT_END
00063 #ifdef PACK_STRUCT_USE_INCLUDES
00064 #  include "arch/epstruct.h"
00065 #endif
00066 
00067 #ifdef PACK_STRUCT_USE_INCLUDES
00068 #  include "arch/bpstruct.h"
00069 #endif
00070 PACK_STRUCT_BEGIN
00071 /** Ethernet header */
00072 struct eth_hdr {
00073 #if ETH_PAD_SIZE
00074   PACK_STRUCT_FIELD(u8_t padding[ETH_PAD_SIZE]);
00075 #endif
00076   PACK_STRUCT_FIELD(struct eth_addr dest);
00077   PACK_STRUCT_FIELD(struct eth_addr src);
00078   PACK_STRUCT_FIELD(u16_t type);
00079 } PACK_STRUCT_STRUCT;
00080 PACK_STRUCT_END
00081 #ifdef PACK_STRUCT_USE_INCLUDES
00082 #  include "arch/epstruct.h"
00083 #endif
00084 
00085 #define SIZEOF_ETH_HDR (14 + ETH_PAD_SIZE)
00086 
00087 #if ETHARP_SUPPORT_VLAN
00088 
00089 #ifdef PACK_STRUCT_USE_INCLUDES
00090 #  include "arch/bpstruct.h"
00091 #endif
00092 PACK_STRUCT_BEGIN
00093 /** VLAN header inserted between ethernet header and payload
00094  * if 'type' in ethernet header is ETHTYPE_VLAN.
00095  * See IEEE802.Q */
00096 struct eth_vlan_hdr {
00097   PACK_STRUCT_FIELD(u16_t tpid);
00098   PACK_STRUCT_FIELD(u16_t prio_vid);
00099 } PACK_STRUCT_STRUCT;
00100 PACK_STRUCT_END
00101 #ifdef PACK_STRUCT_USE_INCLUDES
00102 #  include "arch/epstruct.h"
00103 #endif
00104 
00105 #define SIZEOF_VLAN_HDR 4
00106 #define VLAN_ID(vlan_hdr) (htons((vlan_hdr)->prio_vid) & 0xFFF)
00107 
00108 #endif /* ETHARP_SUPPORT_VLAN */
00109 
00110 #ifdef PACK_STRUCT_USE_INCLUDES
00111 #  include "arch/bpstruct.h"
00112 #endif
00113 PACK_STRUCT_BEGIN
00114 /** the ARP message, see RFC 826 ("Packet format") */
00115 struct etharp_hdr {
00116   PACK_STRUCT_FIELD(u16_t hwtype);
00117   PACK_STRUCT_FIELD(u16_t proto);
00118   PACK_STRUCT_FIELD(u16_t _hwlen_protolen);
00119   PACK_STRUCT_FIELD(u16_t opcode);
00120   PACK_STRUCT_FIELD(struct eth_addr shwaddr);
00121   PACK_STRUCT_FIELD(struct ip_addr2 sipaddr);
00122   PACK_STRUCT_FIELD(struct eth_addr dhwaddr);
00123   PACK_STRUCT_FIELD(struct ip_addr2 dipaddr);
00124 } PACK_STRUCT_STRUCT;
00125 PACK_STRUCT_END
00126 #ifdef PACK_STRUCT_USE_INCLUDES
00127 #  include "arch/epstruct.h"
00128 #endif
00129 
00130 #define SIZEOF_ETHARP_HDR 28
00131 #define SIZEOF_ETHARP_PACKET (SIZEOF_ETH_HDR + SIZEOF_ETHARP_HDR)
00132 
00133 /** 5 seconds period */
00134 #define ARP_TMR_INTERVAL 5000
00135 
00136 #define ETHTYPE_ARP       0x0806
00137 #define ETHTYPE_IP        0x0800
00138 #define ETHTYPE_VLAN      0x8100
00139 #define ETHTYPE_PPPOEDISC 0x8863  /* PPP Over Ethernet Discovery Stage */
00140 #define ETHTYPE_PPPOE     0x8864  /* PPP Over Ethernet Session Stage */
00141 
00142 #if LWIP_ARP /* don't build if not configured for use in lwipopts.h */
00143 
00144 /** ARP message types (opcodes) */
00145 #define ARP_REQUEST 1
00146 #define ARP_REPLY   2
00147 
00148 #if ARP_QUEUEING
00149 /** struct for queueing outgoing packets for unknown address
00150   * defined here to be accessed by memp.h
00151   */
00152 struct etharp_q_entry {
00153   struct etharp_q_entry *next;
00154   struct pbuf *p;
00155 };
00156 #endif /* ARP_QUEUEING */
00157 
00158 #define etharp_init() /* Compatibility define, not init needed. */
00159 void etharp_tmr(void);
00160 s8_t etharp_find_addr(struct netif *netif, ip_addr_t *ipaddr,
00161          struct eth_addr **eth_ret, ip_addr_t **ip_ret);
00162 err_t etharp_output(struct netif *netif, struct pbuf *q, ip_addr_t *ipaddr);
00163 err_t etharp_query(struct netif *netif, ip_addr_t *ipaddr, struct pbuf *q);
00164 err_t etharp_request(struct netif *netif, ip_addr_t *ipaddr);
00165 /** For Ethernet network interfaces, we might want to send "gratuitous ARP";
00166  *  this is an ARP packet sent by a node in order to spontaneously cause other
00167  *  nodes to update an entry in their ARP cache.
00168  *  From RFC 3220 "IP Mobility Support for IPv4" section 4.6. */
00169 #define etharp_gratuitous(netif) etharp_request((netif), &(netif)->ip_addr)
00170 
00171 #if LWIP_AUTOIP
00172 err_t etharp_raw(struct netif *netif, const struct eth_addr *ethsrc_addr,
00173                  const struct eth_addr *ethdst_addr,
00174                  const struct eth_addr *hwsrc_addr, const ip_addr_t *ipsrc_addr,
00175                  const struct eth_addr *hwdst_addr, const ip_addr_t *ipdst_addr,
00176                  const u16_t opcode);
00177 #endif /* LWIP_AUTOIP */
00178 
00179 
00180 #endif /* LWIP_ARP */
00181 
00182 err_t ethernet_input(struct pbuf *p, struct netif *netif);
00183 
00184 #define eth_addr_cmp(addr1, addr2) (memcmp((addr1)->addr, (addr2)->addr, ETHARP_HWADDR_LEN) == 0)
00185 
00186 extern const struct eth_addr ethbroadcast, ethzero;
00187 
00188 #ifdef __cplusplus
00189 }
00190 #endif
00191 
00192 #endif /* LWIP_ARP || LWIP_ETHERNET */
00193 
00194 #endif /* __NETIF_ARP_H__ */