X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=KernelLand%2FModules%2FIPStack%2Farp.c;h=2957eeeac487c6efbf5fec35b8121ca1627459b0;hb=2a49f5a6be4fd478ae4249115ff2a3bf0e34d7e5;hp=43c34256446a089aff96288786436b5f920e7b17;hpb=7ba570fe3cc5418f42decf5b72ac2295cce9e60f;p=tpg%2Facess2.git

diff --git a/KernelLand/Modules/IPStack/arp.c b/KernelLand/Modules/IPStack/arp.c
index 43c34256..2957eeea 100644
--- a/KernelLand/Modules/IPStack/arp.c
+++ b/KernelLand/Modules/IPStack/arp.c
@@ -67,6 +67,7 @@ int ARP_Initialise()
 	#endif
 	
 	Link_RegisterType(0x0806, ARP_int_GetPacket);
+	Semaphore_Init(&gARP_Cache4Semaphore, 0, 0, "ARP4", "Cache Changes");
 	return 1;
 }
 
@@ -171,6 +172,7 @@ tMacAddr ARP_Resolve4(tInterface *Interface, tIPv4 Address)
 			Log_Log("ARP4", "Timeout");
 			break;
 		}
+		Log_Debug("ARP4", "Cache change");
 		
 		Mutex_Acquire( &glARP_Cache4 );
 		for( i = 0; i < giARP_Cache4Space; i++ )
@@ -219,17 +221,20 @@ void ARP_UpdateCache4(tIPv4 SWAddr, tMacAddr HWAddr)
 		else
 			i = oldest;
 	}
-	
-	Log_Log("ARP4", "Caching %i.%i.%i.%i (%02x:%02x:%02x:%02x:%02x:%02x) in %i",
-		SWAddr.B[0], SWAddr.B[1], SWAddr.B[2], SWAddr.B[3],
-		HWAddr.B[0], HWAddr.B[1], HWAddr.B[2], HWAddr.B[3], HWAddr.B[4], HWAddr.B[5],
-		i
-		);
+
+	if( memcmp(&gaARP_Cache4[i].MAC, &HWAddr, sizeof(HWAddr)) != 0 )
+	{
+		Log_Log("ARP4", "Caching %i.%i.%i.%i (%02x:%02x:%02x:%02x:%02x:%02x) in %i",
+			SWAddr.B[0], SWAddr.B[1], SWAddr.B[2], SWAddr.B[3],
+			HWAddr.B[0], HWAddr.B[1], HWAddr.B[2], HWAddr.B[3], HWAddr.B[4], HWAddr.B[5],
+			i
+			);
 		
-	gaARP_Cache4[i].IP = SWAddr;
-	gaARP_Cache4[i].MAC = HWAddr;
-	gaARP_Cache4[i].LastUpdate = now();
-	Semaphore_Signal(&gARP_Cache4Semaphore, giARP_WaitingThreads);
+		gaARP_Cache4[i].IP = SWAddr;
+		gaARP_Cache4[i].MAC = HWAddr;
+		gaARP_Cache4[i].LastUpdate = now();
+		Semaphore_Signal(&gARP_Cache4Semaphore, giARP_WaitingThreads);
+	}
 	Mutex_Release(&glARP_Cache4);
 }