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authorwdenk <wdenk>2002-09-28 00:23:46 +0000
committerwdenk <wdenk>2002-09-28 00:23:46 +0000
commit14aba9c1dce771d6b88e20b1e4b90f5a27a6d31a (patch)
treeb7ca05bf1bff9887a63f7fff1bfdc0d92e5f7a72
parent3861aa5ce05932f5c0f40dcffa3485af555b83bf (diff)
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Initial revision
-rw-r--r--net/arp.c120
1 files changed, 120 insertions, 0 deletions
diff --git a/net/arp.c b/net/arp.c
new file mode 100644
index 0000000..c09dc1a
--- /dev/null
+++ b/net/arp.c
@@ -0,0 +1,120 @@
+/*
+ * (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 <command.h>
+#include <net.h>
+#include "bootp.h"
+#include "tftp.h"
+#include "arp.h"
+
+#if (CONFIG_COMMANDS & CFG_CMD_NET)
+
+#define TIMEOUT 5 /* Seconds before trying ARP again */
+#ifndef CONFIG_NET_RETRY_COUNT
+# define TIMEOUT_COUNT 5 /* # of timeouts before giving up */
+#else
+# define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT)
+#endif
+
+static void ArpHandler(uchar *pkt, unsigned dest, unsigned src, unsigned len);
+static void ArpTimeout(void);
+
+int ArpTry = 0;
+
+/*
+ * Handle a ARP received packet.
+ */
+static void
+ArpHandler(uchar *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) {
+ puts ("\nRetry count exceeded; starting again\n");
+ NetStartAgain ();
+ } else {
+ NetSetTimeout (TIMEOUT * CFG_HZ, ArpTimeout);
+ ArpRequest ();
+ }
+}
+
+
+void
+ArpRequest (void)
+{
+ int i;
+ volatile uchar *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 = htons(ARP_ETHER);
+ arp->ar_pro = htons(PROT_IP);
+ arp->ar_hln = 6;
+ arp->ar_pln = 4;
+ arp->ar_op = htons(ARPOP_REQUEST);
+
+ memcpy (&arp->ar_data[0], NetOurEther, 6); /* source ET addr */
+ NetWriteIP((uchar*)&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)) {
+ if (NetOurGatewayIP == 0) {
+ puts ("## Warning: gatewayip needed but not set\n");
+ }
+ NetWriteIP((uchar*)&arp->ar_data[16], NetOurGatewayIP);
+ } else {
+ NetWriteIP((uchar*)&arp->ar_data[16], NetServerIP);
+ }
+
+
+ NetSendPacket(NetTxPacket, ETHER_HDR_SIZE + ARP_HDR_SIZE);
+
+ NetSetTimeout(TIMEOUT * CFG_HZ, ArpTimeout);
+ NetSetHandler(ArpHandler);
+}
+
+#endif /* CFG_CMD_NET */