#include "link.h"
#define ARP_CACHE_SIZE 64
+#define ARP_MAX_AGE (60*60*1000) // 1Hr
// === IMPORTS ===
extern tInterface *IPv4_GetInterface(tAdapter *Adapter, tIPv4 Address, int Broadcast);
tIPv4 IP4;
tIPv6 IP6;
Sint64 LastUpdate;
+ Sint64 LastUsed;
} *gaARP_Cache;
int giARP_CacheSpace;
+ int giARP_LastUpdateID = 0;
+tSpinlock glARP_Cache;
// === CODE ===
/**
return 1;
}
+/**
+ * \brief Resolves a MAC address from an IPv4 address
+ */
+tMacAddr ARP_Resolve4(tInterface *Interface, tIPv4 Address)
+{
+ int lastID;
+ int i;
+
+ LOCK( &glARP_Cache );
+ for( i = 0; i < giARP_CacheSpace; i++ )
+ {
+ if(gaARP_Cache[i].IP4.L != Address.L) continue;
+
+ // Check if the entry needs to be refreshed
+ if( now() - gaARP_Cache[i].LastUpdate > ARP_MAX_AGE ) break;
+
+ RELEASE( &glARP_Cache );
+ return gaARP_Cache[i].MAC;
+ }
+ RELEASE( &glARP_Cache );
+
+ lastID = giARP_LastUpdateID;
+ ARP_int_Resolve4(Interface, Address);
+ for(;;)
+ {
+ while(lastID == giARP_LastUpdateID) Threads_Yield();
+
+ LOCK( &glARP_Cache );
+ for( i = 0; i < giARP_CacheSpace; i++ )
+ {
+ if(gaARP_Cache[i].IP4.L != Address.L) continue;
+
+ RELEASE( &glARP_Cache );
+ return gaARP_Cache[i].MAC;
+ }
+ RELEASE( &glARP_Cache );
+ }
+}
+
/**
* \fn int ARP_int_Resolve4(tInterface *Interface, tIPv4 Address)
* \brief Request the network to resolve an IPv4 Address
return;
}
- switch( req4->Request )
+ Log("[ARP ] Request ID %i", ntohs(req4->Request));
+
+ switch( ntohs(req4->Request) )
{
case 1: // You want my IP?
+ Log("[ARP ] ARP Request Address class %i", req4->SWSize);
// Check what type of IP it is
switch( req4->SWSize )
{
case 4:
+ Log("[ARP ] From MAC %02x:%02x:%02x:%02x:%02x:%02x",
+ req4->SourceMac.B[0], req4->SourceMac.B[1],
+ req4->SourceMac.B[2], req4->SourceMac.B[3],
+ req4->SourceMac.B[4], req4->SourceMac.B[5]);
+ Log("[ARP ] to MAC %02x:%02x:%02x:%02x:%02x:%02x",
+ req4->DestMac.B[0], req4->DestMac.B[1],
+ req4->DestMac.B[2], req4->DestMac.B[3],
+ req4->DestMac.B[4], req4->DestMac.B[5]);
+ Log("[ARP ] ARP Request IPv4 Address %i.%i.%i.%i",
+ req4->DestIP.B[0], req4->DestIP.B[1], req4->DestIP.B[2],
+ req4->DestIP.B[3]);
+ Log("[ARP ] from %i.%i.%i.%i",
+ req4->SourceIP.B[0], req4->SourceIP.B[1],
+ req4->SourceIP.B[2], req4->SourceIP.B[3]);
iface = IPv4_GetInterface(Adapter, req4->DestIP, 0);
if( iface )
{
- IP4_SET(req4->DestIP, req4->SourceIP);
+ req4->DestIP = req4->SourceIP;
req4->DestMac = req4->SourceMac;
req4->SourceIP = iface->IP4.Address;
req4->SourceMac = Adapter->MacAddr;
req4->Request = htons(2);
+ Log("[ARP ] Hey, That's us!");
+ Log("[ARP ] Sending back %02x:%02x:%02x:%02x:%02x:%02x",
+ req4->SourceMac.B[0], req4->SourceMac.B[1],
+ req4->SourceMac.B[2], req4->SourceMac.B[3],
+ req4->SourceMac.B[4], req4->SourceMac.B[5]);
Link_SendPacket(Adapter, 0x0806, req4->DestMac, sizeof(tArpRequest4), req4);
}
break;
case 2: // Ooh! A response!
// Find an entry for the MAC address in the cache
+ LOCK(&glARP_Cache);
for( i = giARP_CacheSpace; i--; )
{
if(gaARP_Cache[oldest].LastUpdate > gaARP_Cache[i].LastUpdate) {
break;
default:
Log("[ARP ] Unknown Protocol Address size (%i)", req4->SWSize);
+ RELEASE(&glARP_Cache);
return ;
}
gaARP_Cache[i].LastUpdate = now();
+ RELEASE(&glARP_Cache);
break;
}
}