/*
- * (C) Copyright 2000
- * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ * Copied from Linux Monitor (LiMon) - Networking.
*
- * 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
+ * Copyright 1994 - 2000 Neil Russell.
+ * (See License)
+ * Copyright 2000 Roland Borde
+ * Copyright 2000 Paolo Scaffardi
+ * Copyright 2000-2002 Wolfgang Denk, wd@denx.de
*/
#include <common.h>
-#include <command.h>
-#include <net.h>
-#include "bootp.h"
-#include "tftp.h"
-#include "arp.h"
-#if (CONFIG_COMMANDS & CFG_CMD_NET)
+#include "arp.h"
-#define TIMEOUT 5 /* Seconds before trying ARP again */
-#ifndef CONFIG_NET_RETRY_COUNT
-# define TIMEOUT_COUNT 5 /* # of timeouts before giving up */
+#ifndef CONFIG_ARP_TIMEOUT
+/* Milliseconds before trying ARP again */
+# define ARP_TIMEOUT 5000UL
#else
-# define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT)
+# define ARP_TIMEOUT CONFIG_ARP_TIMEOUT
#endif
-static void ArpHandler(uchar *pkt, unsigned dest, unsigned src, unsigned len);
-static void ArpTimeout(void);
-int ArpTry = 0;
+#ifndef CONFIG_NET_RETRY_COUNT
+# define ARP_TIMEOUT_COUNT 5 /* # of timeouts before giving up */
+#else
+# define ARP_TIMEOUT_COUNT CONFIG_NET_RETRY_COUNT
+#endif
-/*
- * Handle a ARP received packet.
- */
-static void
-ArpHandler(uchar *pkt, unsigned dest, unsigned src, unsigned len)
+IPaddr_t NetArpWaitPacketIP;
+IPaddr_t NetArpWaitReplyIP;
+/* MAC address of waiting packet's destination */
+uchar *NetArpWaitPacketMAC;
+/* THE transmit packet */
+uchar *NetArpWaitTxPacket;
+int NetArpWaitTxPacketSize;
+uchar NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
+ulong NetArpWaitTimerStart;
+int NetArpWaitTry;
+
+void ArpInit(void)
{
- /* 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 ();
- }
+ /* XXX problem with bss workaround */
+ NetArpWaitPacketMAC = NULL;
+ NetArpWaitPacketIP = 0;
+ NetArpWaitReplyIP = 0;
+ NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
+ NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
+ NetArpWaitTxPacketSize = 0;
}
-
-/*
- * Timeout on ARP request.
- */
-static void
-ArpTimeout(void)
+void ArpRequest(void)
{
- if (ArpTry >= TIMEOUT_COUNT) {
- puts ("\nRetry count exceeded; starting again\n");
- NetStartAgain ();
+ uchar *pkt;
+ struct arp_hdr *arp;
+ int eth_hdr_size;
+
+ debug("ARP broadcast %d\n", NetArpWaitTry);
+
+ pkt = NetTxPacket;
+
+ eth_hdr_size = NetSetEther(pkt, NetBcastAddr, PROT_ARP);
+ pkt += eth_hdr_size;
+
+ arp = (struct arp_hdr *) pkt;
+
+ arp->ar_hrd = htons(ARP_ETHER);
+ arp->ar_pro = htons(PROT_IP);
+ arp->ar_hln = ARP_HLEN;
+ arp->ar_pln = ARP_PLEN;
+ arp->ar_op = htons(ARPOP_REQUEST);
+
+ /* source ET addr */
+ memcpy(&arp->ar_sha, NetOurEther, ARP_HLEN);
+ /* source IP addr */
+ NetWriteIP(&arp->ar_spa, NetOurIP);
+ /* dest ET addr = 0 */
+ memset(&arp->ar_tha, 0, ARP_HLEN);
+ if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
+ (NetOurIP & NetOurSubnetMask)) {
+ if (NetOurGatewayIP == 0) {
+ puts("## Warning: gatewayip needed but not set\n");
+ NetArpWaitReplyIP = NetArpWaitPacketIP;
+ } else {
+ NetArpWaitReplyIP = NetOurGatewayIP;
+ }
} else {
- NetSetTimeout (TIMEOUT * CFG_HZ, ArpTimeout);
- ArpRequest ();
+ NetArpWaitReplyIP = NetArpWaitPacketIP;
}
-}
+ NetWriteIP(&arp->ar_tpa, NetArpWaitReplyIP);
+ (void) eth_send(NetTxPacket, eth_hdr_size + ARP_HDR_SIZE);
+}
-void
-ArpRequest (void)
+void ArpTimeoutCheck(void)
{
- int i;
- volatile uchar *pkt;
- ARP_t * arp;
+ ulong t;
- printf("ARP broadcast %d\n", ++ArpTry);
- pkt = NetTxPacket;
+ if (!NetArpWaitPacketIP)
+ return;
- NetSetEther(pkt, NetBcastAddr, PROT_ARP);
- pkt += ETHER_HDR_SIZE;
+ t = get_timer(0);
- arp = (ARP_t *)pkt;
+ /* check for arp timeout */
+ if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT) {
+ NetArpWaitTry++;
- 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 (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
+ puts("\nARP Retry count exceeded; starting again\n");
+ NetArpWaitTry = 0;
+ NetStartAgain();
+ } else {
+ NetArpWaitTimerStart = t;
+ ArpRequest();
+ }
}
+}
- 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);
+void ArpReceive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
+{
+ struct arp_hdr *arp;
+ IPaddr_t reply_ip_addr;
+ uchar *pkt;
+ int eth_hdr_size;
+
+ /*
+ * We have to deal with two types of ARP packets:
+ * - REQUEST packets will be answered by sending our
+ * IP address - if we know it.
+ * - REPLY packates are expected only after we asked
+ * for the TFTP server's or the gateway's ethernet
+ * address; so if we receive such a packet, we set
+ * the server ethernet address
+ */
+ debug("Got ARP\n");
+
+ arp = (struct arp_hdr *)ip;
+ if (len < ARP_HDR_SIZE) {
+ printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
+ return;
}
+ if (ntohs(arp->ar_hrd) != ARP_ETHER)
+ return;
+ if (ntohs(arp->ar_pro) != PROT_IP)
+ return;
+ if (arp->ar_hln != ARP_HLEN)
+ return;
+ if (arp->ar_pln != ARP_PLEN)
+ return;
+
+ if (NetOurIP == 0)
+ return;
+
+ if (NetReadIP(&arp->ar_tpa) != NetOurIP)
+ return;
+
+ switch (ntohs(arp->ar_op)) {
+ case ARPOP_REQUEST:
+ /* reply with our IP address */
+ debug("Got ARP REQUEST, return our IP\n");
+ pkt = (uchar *)et;
+ eth_hdr_size = NetSetEther(pkt, et->et_src, PROT_ARP);
+ pkt += eth_hdr_size;
+ arp->ar_op = htons(ARPOP_REPLY);
+ memcpy(&arp->ar_tha, &arp->ar_sha, ARP_HLEN);
+ NetCopyIP(&arp->ar_tpa, &arp->ar_spa);
+ memcpy(&arp->ar_sha, NetOurEther, ARP_HLEN);
+ NetCopyIP(&arp->ar_spa, &NetOurIP);
+ (void) eth_send((uchar *)et, eth_hdr_size + ARP_HDR_SIZE);
+ return;
+
+ case ARPOP_REPLY: /* arp reply */
+ /* are we waiting for a reply */
+ if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
+ break;
+
+#ifdef CONFIG_KEEP_SERVERADDR
+ if (NetServerIP == NetArpWaitPacketIP) {
+ char buf[20];
+ sprintf(buf, "%pM", arp->ar_sha);
+ setenv("serveraddr", buf);
+ }
+#endif
+ reply_ip_addr = NetReadIP(&arp->ar_spa);
- NetSendPacket(NetTxPacket, ETHER_HDR_SIZE + ARP_HDR_SIZE);
+ /* matched waiting packet's address */
+ if (reply_ip_addr == NetArpWaitReplyIP) {
+ debug("Got ARP REPLY, set eth addr (%pM)\n",
+ arp->ar_data);
- NetSetTimeout(TIMEOUT * CFG_HZ, ArpTimeout);
- NetSetHandler(ArpHandler);
-}
+ /* save address for later use */
+ memcpy(NetArpWaitPacketMAC,
+ &arp->ar_sha, ARP_HLEN);
-#endif /* CFG_CMD_NET */
+#ifdef CONFIG_NETCONSOLE
+ NetGetHandler()(0, 0, 0, 0, 0);
+#endif
+ /* modify header, and transmit it */
+ memcpy(((struct ethernet_hdr *)NetArpWaitTxPacket)->
+ et_dest, NetArpWaitPacketMAC, ARP_HLEN);
+ (void) eth_send(NetArpWaitTxPacket,
+ NetArpWaitTxPacketSize);
+
+ /* no arp request pending now */
+ NetArpWaitPacketIP = 0;
+ NetArpWaitTxPacketSize = 0;
+ NetArpWaitPacketMAC = NULL;
+
+ }
+ return;
+ default:
+ debug("Unexpected ARP opcode 0x%x\n",
+ ntohs(arp->ar_op));
+ return;
+ }
+}
git.openpandora.org / pandora-u-boot.git / blobdiff