X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=net%2Farp.c;h=21ed31bf742dd3582add21aed5bf1333591d3c0e;hb=55f3bc7906c0f068f685b7dc6060c67c1f407c3f;hp=8cc175a7d4393f5cdb5972acf6af81c10b9b4b16;hpb=e71110158124009c043eac704db9d442db43b36d;p=karo-tx-uboot.git

diff --git a/net/arp.c b/net/arp.c
index 8cc175a7d4..21ed31bf74 100644
--- a/net/arp.c
+++ b/net/arp.c
@@ -6,6 +6,7 @@
  *	Copyright 2000 Roland Borde
  *	Copyright 2000 Paolo Scaffardi
  *	Copyright 2000-2002 Wolfgang Denk, wd@denx.de
+ *	SPDX-License-Identifier:	GPL-2.0
  */
 
 #include <common.h>
@@ -27,36 +28,37 @@
 #endif
 
 IPaddr_t	NetArpWaitPacketIP;
-IPaddr_t	NetArpWaitReplyIP;
+static 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;
 
+static uchar   *NetArpTxPacket;	/* THE ARP transmit packet */
+static uchar	NetArpPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
+
 void ArpInit(void)
 {
 	/* XXX problem with bss workaround */
 	NetArpWaitPacketMAC = NULL;
 	NetArpWaitPacketIP = 0;
 	NetArpWaitReplyIP = 0;
-	NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
-	NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
 	NetArpWaitTxPacketSize = 0;
+	NetArpTxPacket = &NetArpPacketBuf[0] + (PKTALIGN - 1);
+	NetArpTxPacket -= (ulong)NetArpTxPacket % PKTALIGN;
 }
 
-void ArpRequest(void)
+void arp_raw_request(IPaddr_t sourceIP, const uchar *targetEther,
+	IPaddr_t targetIP)
 {
 	uchar *pkt;
 	struct arp_hdr *arp;
 	int eth_hdr_size;
 
-	debug("ARP broadcast %d\n", NetArpWaitTry);
+	debug_cond(DEBUG_DEV_PKT, "ARP broadcast %d\n", NetArpWaitTry);
 
-	pkt = NetTxPacket;
+	pkt = NetArpTxPacket;
 
 	eth_hdr_size = NetSetEther(pkt, NetBcastAddr, PROT_ARP);
 	pkt += eth_hdr_size;
@@ -69,12 +71,16 @@ void ArpRequest(void)
 	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);
+	memcpy(&arp->ar_sha, NetOurEther, ARP_HLEN);	/* source ET addr */
+	NetWriteIP(&arp->ar_spa, sourceIP);		/* source IP addr */
+	memcpy(&arp->ar_tha, targetEther, ARP_HLEN);	/* target ET addr */
+	NetWriteIP(&arp->ar_tpa, targetIP);		/* target IP addr */
+
+	NetSendPacket(NetArpTxPacket, eth_hdr_size + ARP_HDR_SIZE);
+}
+
+void ArpRequest(void)
+{
 	if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
 	    (NetOurIP & NetOurSubnetMask)) {
 		if (NetOurGatewayIP == 0) {
@@ -87,8 +93,7 @@ void ArpRequest(void)
 		NetArpWaitReplyIP = NetArpWaitPacketIP;
 	}
 
-	NetWriteIP(&arp->ar_tpa, NetArpWaitReplyIP);
-	NetSendPacket(NetTxPacket, eth_hdr_size + ARP_HDR_SIZE);
+	arp_raw_request(NetOurIP, NetEtherNullAddr, NetArpWaitReplyIP);
 }
 
 void ArpTimeoutCheck(void)
@@ -131,7 +136,7 @@ void ArpReceive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
 	 *   address; so if we receive such a packet, we set
 	 *   the server ethernet address
 	 */
-	debug("Got ARP\n");
+	debug_cond(DEBUG_NET_PKT, "Got ARP\n");
 
 	arp = (struct arp_hdr *)ip;
 	if (len < ARP_HDR_SIZE) {
@@ -156,7 +161,7 @@ void ArpReceive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
 	switch (ntohs(arp->ar_op)) {
 	case ARPOP_REQUEST:
 		/* reply with our IP address */
-		debug("Got ARP REQUEST, return our IP\n");
+		debug_cond(DEBUG_DEV_PKT, "Got ARP REQUEST, return our IP\n");
 		pkt = (uchar *)et;
 		eth_hdr_size = net_update_ether(et, et->et_src, PROT_ARP);
 		pkt += eth_hdr_size;
@@ -165,18 +170,32 @@ void ArpReceive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
 		NetCopyIP(&arp->ar_tpa, &arp->ar_spa);
 		memcpy(&arp->ar_sha, NetOurEther, ARP_HLEN);
 		NetCopyIP(&arp->ar_spa, &NetOurIP);
+
+#ifdef CONFIG_CMD_LINK_LOCAL
+		/*
+		 * Work-around for brain-damaged Cisco equipment with
+		 *   arp-proxy enabled.
+		 *
+		 *   If the requesting IP is not on our subnet, wait 5ms to
+		 *   reply to ARP request so that our reply will overwrite
+		 *   the arp-proxy's instead of the other way around.
+		 */
+		if ((NetReadIP(&arp->ar_tpa) & NetOurSubnetMask) !=
+		    (NetReadIP(&arp->ar_spa) & NetOurSubnetMask))
+			udelay(5000);
+#endif
 		NetSendPacket((uchar *)et, eth_hdr_size + ARP_HDR_SIZE);
 		return;
 
 	case ARPOP_REPLY:		/* arp reply */
 		/* are we waiting for a reply */
-		if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
+		if (!NetArpWaitPacketIP)
 			break;
 
 #ifdef CONFIG_KEEP_SERVERADDR
 		if (NetServerIP == NetArpWaitPacketIP) {
 			char buf[20];
-			sprintf(buf, "%pM", arp->ar_sha);
+			sprintf(buf, "%pM", &arp->ar_sha);
 			setenv("serveraddr", buf);
 		}
 #endif
@@ -185,21 +204,23 @@ void ArpReceive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
 
 		/* matched waiting packet's address */
 		if (reply_ip_addr == NetArpWaitReplyIP) {
-			debug("Got ARP REPLY, set eth addr (%pM)\n",
+			debug_cond(DEBUG_DEV_PKT,
+				"Got ARP REPLY, set eth addr (%pM)\n",
 				arp->ar_data);
 
 			/* save address for later use */
-			memcpy(NetArpWaitPacketMAC,
-				&arp->ar_sha, ARP_HLEN);
+			if (NetArpWaitPacketMAC != NULL)
+				memcpy(NetArpWaitPacketMAC,
+				       &arp->ar_sha, ARP_HLEN);
 
 			net_get_arp_handler()((uchar *)arp, 0, reply_ip_addr,
 				0, len);
 
-			/* modify header, and transmit it */
-			memcpy(((struct ethernet_hdr *)NetArpWaitTxPacket)->
-				et_dest, NetArpWaitPacketMAC, ARP_HLEN);
-			NetSendPacket(NetArpWaitTxPacket,
-					NetArpWaitTxPacketSize);
+			/* set the mac address in the waiting packet's header
+			   and transmit it */
+			memcpy(((struct ethernet_hdr *)NetTxPacket)->et_dest,
+				&arp->ar_sha, ARP_HLEN);
+			NetSendPacket(NetTxPacket, NetArpWaitTxPacketSize);
 
 			/* no arp request pending now */
 			NetArpWaitPacketIP = 0;