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121 lines
2.9 KiB
C
121 lines
2.9 KiB
C
/*
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* (C) Copyright 2000
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <command.h>
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#include <net.h>
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#include "bootp.h"
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#include "tftp.h"
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#include "arp.h"
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#if (CONFIG_COMMANDS & CFG_CMD_NET)
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#define TIMEOUT 5 /* Seconds before trying ARP again */
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#ifndef CONFIG_NET_RETRY_COUNT
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# define TIMEOUT_COUNT 5 /* # of timeouts before giving up */
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#else
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# define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT)
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#endif
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static void ArpHandler(uchar *pkt, unsigned dest, unsigned src, unsigned len);
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static void ArpTimeout(void);
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int ArpTry = 0;
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/*
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* Handle a ARP received packet.
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*/
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static void
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ArpHandler(uchar *pkt, unsigned dest, unsigned src, unsigned len)
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{
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/* Check if the frame is really an ARP reply */
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if (memcmp (NetServerEther, NetBcastAddr, 6) != 0) {
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#ifdef DEBUG
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printf("Got good ARP - start TFTP\n");
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#endif
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TftpStart ();
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}
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}
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/*
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* Timeout on ARP request.
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*/
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static void
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ArpTimeout(void)
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{
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if (ArpTry >= TIMEOUT_COUNT) {
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puts ("\nRetry count exceeded; starting again\n");
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NetStartAgain ();
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} else {
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NetSetTimeout (TIMEOUT * CFG_HZ, ArpTimeout);
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ArpRequest ();
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}
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}
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void
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ArpRequest (void)
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{
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int i;
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volatile uchar *pkt;
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ARP_t * arp;
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printf("ARP broadcast %d\n", ++ArpTry);
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pkt = NetTxPacket;
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NetSetEther(pkt, NetBcastAddr, PROT_ARP);
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pkt += ETHER_HDR_SIZE;
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arp = (ARP_t *)pkt;
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arp->ar_hrd = htons(ARP_ETHER);
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arp->ar_pro = htons(PROT_IP);
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arp->ar_hln = 6;
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arp->ar_pln = 4;
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arp->ar_op = htons(ARPOP_REQUEST);
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memcpy (&arp->ar_data[0], NetOurEther, 6); /* source ET addr */
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NetWriteIP((uchar*)&arp->ar_data[6], NetOurIP); /* source IP addr */
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for (i=10; i<16; ++i) {
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arp->ar_data[i] = 0; /* dest ET addr = 0 */
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}
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if((NetServerIP & NetOurSubnetMask) != (NetOurIP & NetOurSubnetMask)) {
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if (NetOurGatewayIP == 0) {
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puts ("## Warning: gatewayip needed but not set\n");
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}
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NetWriteIP((uchar*)&arp->ar_data[16], NetOurGatewayIP);
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} else {
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NetWriteIP((uchar*)&arp->ar_data[16], NetServerIP);
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}
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NetSendPacket(NetTxPacket, ETHER_HDR_SIZE + ARP_HDR_SIZE);
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NetSetTimeout(TIMEOUT * CFG_HZ, ArpTimeout);
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NetSetHandler(ArpHandler);
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}
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#endif /* CFG_CMD_NET */
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