00001 /*
00002 * Copyright (C) 2001-2002 by egnite Software GmbH. All rights reserved.
00003 *
00004 * Redistribution and use in source and binary forms, with or without
00005 * modification, are permitted provided that the following conditions
00006 * are met:
00007 *
00008 * 1. Redistributions of source code must retain the above copyright
00009 * notice, this list of conditions and the following disclaimer.
00010 * 2. Redistributions in binary form must reproduce the above copyright
00011 * notice, this list of conditions and the following disclaimer in the
00012 * documentation and/or other materials provided with the distribution.
00013 * 3. All advertising materials mentioning features or use of this
00014 * software must display the following acknowledgement:
00015 *
00016 * This product includes software developed by egnite Software GmbH
00017 * and its contributors.
00018 *
00019 * THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH AND CONTRIBUTORS
00020 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00021 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
00022 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL EGNITE
00023 * SOFTWARE GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
00024 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
00025 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
00026 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
00027 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00028 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
00029 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00030 * SUCH DAMAGE.
00031 *
00032 * For additional information see http://www.ethernut.de/
00033 *
00034 * -
00035 * Portions Copyright (c) 1983, 1993 by
00036 * The Regents of the University of California. All rights reserved.
00037 *
00038 * Redistribution and use in source and binary forms, with or without
00039 * modification, are permitted provided that the following conditions
00040 * are met:
00041 * 1. Redistributions of source code must retain the above copyright
00042 * notice, this list of conditions and the following disclaimer.
00043 * 2. Redistributions in binary form must reproduce the above copyright
00044 * notice, this list of conditions and the following disclaimer in the
00045 * documentation and/or other materials provided with the distribution.
00046 * 3. All advertising materials mentioning features or use of this software
00047 * must display the following acknowledgement:
00048 * This product includes software developed by the University of
00049 * California, Berkeley and its contributors.
00050 * 4. Neither the name of the University nor the names of its contributors
00051 * may be used to endorse or promote products derived from this software
00052 * without specific prior written permission.
00053 *
00054 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
00055 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00056 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00057 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
00058 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00059 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00060 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00061 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00062 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00063 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00064 * SUCH DAMAGE.
00065 * -
00066 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
00067 *
00068 * Permission to use, copy, modify, and distribute this software for any
00069 * purpose with or without fee is hereby granted, provided that the above
00070 * copyright notice and this permission notice appear in all copies, and that
00071 * the name of Digital Equipment Corporation not be used in advertising or
00072 * publicity pertaining to distribution of the document or software without
00073 * specific, written prior permission.
00074 *
00075 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
00076 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
00077 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
00078 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
00079 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
00080 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
00081 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
00082 * SOFTWARE.
00083 */
00084
00085 /*
00086 * $Log: arp.c,v $
00087 * Revision 1.1 2002/08/01 17:34:29 harald
00088 * First check in
00089 *
00090 */
00091
00092 #include <string.h>
00093
00094 #include "eboot.h"
00095 #include "ip.h"
00096 #include "arp.h"
00097
00098 /*!
00099 * \addtogroup xgStack
00100 */
00101 /*@{*/
00102
00103 ARPENTRY ae;
00104 ARPFRAME arpframe;
00105
00106 /*!
00107 * \brief Request the MAC address of a specified IP address.
00108 *
00109 * \param dip IP address in network byte order.
00110 * \param dmac Points to the buffer, that will receive the MAC address.
00111 *
00112 * \return 0 on success, -1 otherwise.
00113 */
00114 int ArpRequest(u_long dip, u_char *dmac)
00115 {
00116 ETHERARP *ea = &arpframe.eth_arp;
00117 u_char retry;
00118 int rlen;
00119 u_char i;
00120
00121 if(dip == INADDR_BROADCAST) {
00122 for(i = 0; i < 6; i++)
00123 dmac[i] = 0xFF;
00124 return 0;
00125 }
00126 if(ae.ae_ip != dip) {
00127
00128 /*
00129 * Set ARP header.
00130 */
00131 ea->arp_hrd = htons(ARPHRD_ETHER);
00132 ea->arp_pro = ETHERTYPE_IP;
00133 ea->arp_hln = 6;
00134 ea->arp_pln = 4;
00135 ea->arp_op = htons(ARPOP_REQUEST);
00136 for(i = 0; i < 6; i++)
00137 ea->arp_sha[i] = mac[i];
00138 ea->arp_spa = local_ip;
00139 for(i = 0; i < 6; i++)
00140 ea->arp_tha[i] = 0xFF;
00141 ea->arp_tpa = dip;
00142
00143 for(rlen = retry = 0; rlen == 0 && retry < 10; retry++) {
00144 if(EtherOutput(0, ETHERTYPE_ARP, sizeof(ETHERARP)) < 0)
00145 break;
00146 if((rlen = EtherInput(ETHERTYPE_ARP, 1000)) > 0) {
00147 ARPFRAME *af = (ARPFRAME *)&rframe;
00148
00149 ea = &af->eth_arp;
00150 if(ea->arp_tpa == local_ip) {
00151 if(htons(ea->arp_op) == ARPOP_REPLY) {
00152 ae.ae_ip = ea->arp_spa;
00153 for(i = 0; i < 6; i++)
00154 ae.ae_ha[i] = ea->arp_sha[i];
00155 break;
00156 }
00157 }
00158 rlen = 0;
00159 }
00160 }
00161 }
00162 if(ae.ae_ip != dip)
00163 return -1;
00164
00165 for(i = 0; i < 6; i++)
00166 dmac[i] = ae.ae_ha[i];
00167
00168 return 0;
00169 }
00170
00171 /*!
00172 * \brief Process incoming ARP packets.
00173 *
00174 * We do not really respond to ARP requests.
00175 */
00176 void ArpRespond(void)
00177 {
00178 u_char i;
00179 ARPFRAME *af = (ARPFRAME *)&rframe;
00180 ETHERARP *ea = &af->eth_arp;
00181
00182 ea = &arpframe.eth_arp;
00183 if(ea->arp_tpa == local_ip) {
00184 if(htons(ea->arp_op) == ARPOP_REPLY) {
00185 ae.ae_ip = ea->arp_spa;
00186 for(i = 0; i < 6; i++)
00187 ae.ae_ha[i] = ea->arp_sha[i];
00188 }
00189 }
00190 }
00191 /*@}*/