#include "include/adapters_int.h" // for MAC addr
#include <semaphore.h>
#include <timers.h>
+#include "hwaddr_cache.h"
#define ARPv6 0
#define ARP_CACHE_SIZE 128
// === PROTOTYPES ===
int ARP_Initialise();
-tMacAddr ARP_Resolve4(tInterface *Interface, tIPv4 Address);
void ARP_int_GetPacket(tAdapter *Adapter, tMacAddr From, int Length, void *Buffer);
// === GLOBALS ===
-struct sARP_Cache4 {
- tIPv4 IP;
- tMacAddr MAC;
- Sint64 LastUpdate;
- Sint64 LastUsed;
-} *gaARP_Cache4;
- int giARP_Cache4Space;
-tMutex glARP_Cache4;
-tSemaphore gARP_Cache4Semaphore;
- int giARP_WaitingThreads;
-#if ARPv6
-struct sARP_Cache6 {
- tIPv6 IP;
- tMacAddr MAC;
- Sint64 LastUpdate;
- Sint64 LastUsed;
-} *gaARP_Cache6;
- int giARP_Cache6Space;
-tMutex glARP_Cache6;
-#endif
// === CODE ===
/**
*/
int ARP_Initialise()
{
- gaARP_Cache4 = malloc( ARP_CACHE_SIZE * sizeof(struct sARP_Cache4) );
- memset( gaARP_Cache4, 0, ARP_CACHE_SIZE * sizeof(struct sARP_Cache4) );
- giARP_Cache4Space = ARP_CACHE_SIZE;
-
- #if ARPv6
- gaARP_Cache6 = malloc( ARP_CACHE_SIZE * sizeof(struct sARP_Cache6) );
- memset( gaARP_Cache6, 0, ARP_CACHE_SIZE * sizeof(struct sARP_Cache6) );
- giARP_Cache6Space = ARP_CACHE_SIZE;
- #endif
-
Link_RegisterType(0x0806, ARP_int_GetPacket);
return 1;
}
-/**
- * \brief Resolves a MAC address from an IPv4 address
- */
-tMacAddr ARP_Resolve4(tInterface *Interface, tIPv4 Address)
+void ARP_Request4(tInterface *Interface, tIPv4 Address)
{
- int i;
struct sArpRequest4 req;
-
- ENTER("pInterface xAddress", Interface, Address);
-
- // Check for broadcast
- if( Address.L == -1 )
- {
- LOG("Broadcast");
- LEAVE('-');
- return cMAC_BROADCAST;
- }
-
- // Check routing tables if not on this subnet
- if( IPStack_CompareAddress(4, &Address, Interface->Address, Interface->SubnetBits) == 0 )
- {
- tRoute *route = IPStack_FindRoute(4, Interface, &Address);
- // If the next hop is defined, use it
- // - 0.0.0.0 as the next hop means "no next hop / direct"
- if( route && ((tIPv4*)route->NextHop)->L != 0 )
- {
- // Recursion: see /Recursion/
- LOG("Recursing with %s", IPStack_PrintAddress(4, route->NextHop));
- LEAVE('-');
- return ARP_Resolve4(Interface, *(tIPv4*)route->NextHop);
- }
- // No route, fall though
- }
- else
- {
- Uint32 netmask;
- // Check for broadcast
- netmask = IPv4_Netmask(Interface->SubnetBits);
- if( (Address.L & ~netmask) == (0xFFFFFFFF & ~netmask) )
- {
- LOG("Local Broadcast");
- LEAVE('-');
- return cMAC_BROADCAST;
- }
- }
-
- // Check ARP Cache
- Mutex_Acquire( &glARP_Cache4 );
- for( i = 0; i < giARP_Cache4Space; i++ )
- {
- if(gaARP_Cache4[i].IP.L != Address.L) continue;
-
- // Check if the entry needs to be refreshed
- if( now() - gaARP_Cache4[i].LastUpdate > ARP_MAX_AGE ) break;
-
- Mutex_Release( &glARP_Cache4 );
- LOG("Return %x:%x:%x:%x:%x:%x",
- gaARP_Cache4[i].MAC.B[0], gaARP_Cache4[i].MAC.B[1],
- gaARP_Cache4[i].MAC.B[2], gaARP_Cache4[i].MAC.B[3],
- gaARP_Cache4[i].MAC.B[4], gaARP_Cache4[i].MAC.B[5]
- );
- LEAVE('-');
- return gaARP_Cache4[i].MAC;
- }
- giARP_WaitingThreads ++;
- Mutex_Release( &glARP_Cache4 );
-
// Create request
Log_Log("ARP4", "Asking for address %i.%i.%i.%i",
Address.B[0], Address.B[1], Address.B[2], Address.B[3]
// Send Request
Link_SendPacket(Interface->Adapter, 0x0806, req.DestMac, buffer);
-
- // Clean up
- IPStack_Buffer_DestroyBuffer(buffer);
-
- // Wait for a reply
- Time_ScheduleTimer(NULL, Interface->TimeoutDelay);
- for(;;)
- {
- if( Semaphore_Wait(&gARP_Cache4Semaphore, 1) != 1 )
- {
- giARP_WaitingThreads --;
- Log_Log("ARP4", "Timeout");
- break;
- }
-
- Mutex_Acquire( &glARP_Cache4 );
- for( i = 0; i < giARP_Cache4Space; i++ )
- {
- if(gaARP_Cache4[i].IP.L != Address.L) continue;
-
- giARP_WaitingThreads --;
- Mutex_Release( &glARP_Cache4 );
- Log_Debug("ARP4", "Return %02x:%02x:%02x:%02x:%02x:%02x",
- gaARP_Cache4[i].MAC.B[0], gaARP_Cache4[i].MAC.B[1],
- gaARP_Cache4[i].MAC.B[2], gaARP_Cache4[i].MAC.B[3],
- gaARP_Cache4[i].MAC.B[4], gaARP_Cache4[i].MAC.B[5]);
- return gaARP_Cache4[i].MAC;
- }
- Mutex_Release( &glARP_Cache4 );
- }
- {
- tMacAddr ret = {{0,0,0,0,0,0}};
- return ret;
- }
-}
-
-/**
- * \brief Updates the ARP Cache entry for an IPv4 Address
- */
-void ARP_UpdateCache4(tIPv4 SWAddr, tMacAddr HWAddr)
-{
- int i;
- int free = -1;
- int oldest = 0;
-
- // Find an entry for the IP address in the cache
- Mutex_Acquire(&glARP_Cache4);
- for( i = giARP_Cache4Space; i--; )
- {
- if(gaARP_Cache4[oldest].LastUpdate > gaARP_Cache4[i].LastUpdate) {
- oldest = i;
- }
- if( gaARP_Cache4[i].IP.L == SWAddr.L ) break;
- if( gaARP_Cache4[i].LastUpdate == 0 && free == -1 ) free = i;
- }
- // If there was no match, we need to make one
- if(i == -1) {
- if(free != -1)
- i = free;
- 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
- );
-
- 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);
}
-#if ARPv6
-/**
- * \brief Updates the ARP Cache entry for an IPv6 Address
- */
-void ARP_UpdateCache6(tIPv6 SWAddr, tMacAddr HWAddr)
-{
- int i;
- int free = -1;
- int oldest = 0;
-
- // Find an entry for the MAC address in the cache
- Mutex_Acquire(&glARP_Cache6);
- for( i = giARP_Cache6Space; i--; )
- {
- if(gaARP_Cache6[oldest].LastUpdate > gaARP_Cache6[i].LastUpdate) {
- oldest = i;
- }
- if( MAC_EQU(gaARP_Cache6[i].MAC, HWAddr) ) break;
- if( gaARP_Cache6[i].LastUpdate == 0 && free == -1 ) free = i;
- }
- // If there was no match, we need to make one
- if(i == -1) {
- if(free != -1)
- i = free;
- else
- i = oldest;
- gaARP_Cache6[i].MAC = HWAddr;
- }
-
- gaARP_Cache6[i].IP = SWAddr;
- gaARP_Cache6[i].LastUpdate = now();
- giARP_LastUpdateID ++;
- Mutex_Release(&glARP_Cache6);
-}
-#endif
-
/**
* \fn void ARP_int_GetPacket(tAdapter *Adapter, tMacAddr From, int Length, void *Buffer)
* \brief Called when an ARP packet is recieved
switch( req4->SWSize )
{
case 4:
- Log_Debug("ARP", "ARP Request IPv4 Address %i.%i.%i.%i from %i.%i.%i.%i",
- req4->DestIP.B[0], req4->DestIP.B[1], req4->DestIP.B[2],
- req4->DestIP.B[3],
- req4->SourceIP.B[0], req4->SourceIP.B[1],
- req4->SourceIP.B[2], req4->SourceIP.B[3]);
- Log_Debug("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]);
iface = IPv4_GetInterface(Adapter, req4->DestIP, 0);
if( iface )
{
- ARP_UpdateCache4(req4->SourceIP, req4->SourceMac);
+ Log_Debug("ARP", "ARP Request IPv4 Address %i.%i.%i.%i from %i.%i.%i.%i"
+ " (%02x:%02x:%02x:%02x:%02x:%02x)",
+ req4->DestIP.B[0], req4->DestIP.B[1], req4->DestIP.B[2],
+ req4->DestIP.B[3],
+ req4->SourceIP.B[0], req4->SourceIP.B[1],
+ req4->SourceIP.B[2], req4->SourceIP.B[3],
+ req4->SourceMac.B[0], req4->SourceMac.B[1],
+ req4->SourceMac.B[2], req4->SourceMac.B[3],
+ req4->SourceMac.B[4], req4->SourceMac.B[5]);
+ // Someone has ARPed us, let's cache them
+ HWCache_Set(Adapter, 4, &req4->SourceIP, &req4->SourceMac);
req4->DestIP = req4->SourceIP;
req4->DestMac = req4->SourceMac;
// Assumes only a header and footer at link layer
tIPStackBuffer *buffer = IPStack_Buffer_CreateBuffer(3);
- IPStack_Buffer_AppendSubBuffer(buffer, sizeof(struct sArpRequest4), 0, req4, NULL, NULL);
+ IPStack_Buffer_AppendSubBuffer(buffer,
+ sizeof(struct sArpRequest4), 0, req4,
+ NULL, NULL);
Link_SendPacket(Adapter, 0x0806, req4->DestMac, buffer);
- IPStack_Buffer_DestroyBuffer(buffer);
}
break;
#if ARPv6
switch( req4->SWSize )
{
case 4:
- ARP_UpdateCache4( req4->SourceIP, From );
+ HWCache_Set(Adapter, 4, &req4->SourceIP, &From);
break;
#if ARPv6
case 6:
Log_Debug("ARP", "Recieved undersized packet (IPv6)");
return ;
}
- ARP_UpdateCache6( req6->SourceIP, From );
+ HWCache_Set(Adapter, 6, &req6->SourceIP, &From );
break;
#endif
default:
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