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[/] [or1k/] [branches/] [oc/] [orpmon/] [services/] [arp.c] - Rev 1767
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/* * (C) Copyright 2000 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ #include "common.h" #include "support.h" #include "net.h" #include "bootp.h" #include "tftp.h" #include "arp.h" #define TIMEOUT 5 /* Seconds before trying ARP again */ #define TIMEOUT_COUNT 1 /* # of timeouts before giving up */ static void ArpHandler(unsigned char *pkt, unsigned dest, unsigned src, unsigned len); static void ArpTimeout(void); int ArpTry = 0; /* * Handle a ARP received packet. */ static void ArpHandler(unsigned char *pkt, unsigned dest, unsigned src, unsigned len) { /* Check if the frame is really an ARP reply */ if (memcmp (NetServerEther, NetBcastAddr, 6) != 0) { #ifdef DEBUG printf("Got good ARP - start TFTP\n"); #endif TftpStart (); } } /* * Timeout on ARP request. */ static void ArpTimeout(void) { if (ArpTry >= TIMEOUT_COUNT) { printf("\nRetry count exceeded; starting again\n"); NetStartAgain (); } else { NetSetTimeout (TIMEOUT * IN_CLK, ArpTimeout); ArpRequest (); } } void ArpRequest (void) { int i; volatile unsigned char *pkt; ARP_t * arp; printf("ARP broadcast %d\n", ++ArpTry); pkt = NetTxPacket; NetSetEther(pkt, NetBcastAddr, PROT_ARP); pkt += ETHER_HDR_SIZE; arp = (ARP_t *)pkt; arp->ar_hrd = ARP_ETHER; arp->ar_pro = PROT_IP; arp->ar_hln = 6; arp->ar_pln = 4; arp->ar_op = ARPOP_REQUEST; NetCopyEther(&arp->ar_data[0], NetOurEther); /* source ET addr */ *(IPaddr_t *)(&arp->ar_data[6]) = NetOurIP; /* source IP addr */ for (i=10; i<16; ++i) { arp->ar_data[i] = 0; /* dest ET addr = 0 */ } if((NetServerIP & NetOurSubnetMask) != (NetOurIP & NetOurSubnetMask)) { *(IPaddr_t *)(&arp->ar_data[16]) = NetOurGatewayIP; } else { *(IPaddr_t *)(&arp->ar_data[16]) = NetServerIP; } NetSendPacket(NetTxPacket, ETHER_HDR_SIZE + ARP_HDR_SIZE); NetSetTimeout(TIMEOUT * IN_CLK, ArpTimeout); NetSetHandler(ArpHandler); }
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