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 /*@}*/