Implementing (and using) select() at kernel level

[tpg/acess2.git] / Modules / IPStack / arp.c

diff --git a/Modules/IPStack/arp.c b/Modules/IPStack/arp.c
index d84b918..8238263 100644 (file)
--- a/Modules/IPStack/arp.c
+++ b/Modules/IPStack/arp.c
@@ -1,13 +1,14 @@
 /*
  * Acess2 IP Stack
  * - Address Resolution Protocol
+ * - Part of the IPv4 protocol
  */
 #define DEBUG  0
 #include "ipstack.h"
 #include "arp.h"
 #include "link.h"
 
-#define ARPv6  1
+#define ARPv6  0
 #define        ARP_CACHE_SIZE  64
 #define        ARP_MAX_AGE             (60*60*1000)    // 1Hr
 
@@ -72,9 +73,25 @@ tMacAddr ARP_Resolve4(tInterface *Interface, tIPv4 Address)
         int    lastID;
         int    i;
        struct sArpRequest4     req;
+       Sint64  timeout;
        
        ENTER("pInterface xAddress", Interface, Address);
        
+       // 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( route ) {
+                       // If the next hop is defined, use it
+                       // - 0.0.0.0 as the next hop means "no next hop / direct"
+                       if( ((tIPv4*)route->NextHop)->L != 0 ) {
+                               // Recursion: see /Recursion/
+                               return ARP_Resolve4(Interface, *(tIPv4*)route->NextHop);
+                       }
+               }
+       }
+       
+       // Check ARP Cache
        Mutex_Acquire( &glARP_Cache4 );
        for( i = 0; i < giARP_Cache4Space; i++ )
        {
@@ -106,17 +123,23 @@ tMacAddr ARP_Resolve4(tInterface *Interface, tIPv4 Address)
        req.SWSize = 4;
        req.Request = htons(1);
        req.SourceMac = Interface->Adapter->MacAddr;
-       req.SourceIP = Interface->IP4.Address;
+       req.SourceIP = *(tIPv4*)Interface->Address;
        req.DestMac = cMAC_BROADCAST;
        req.DestIP = Address;
        
        // Send Request
        Link_SendPacket(Interface->Adapter, 0x0806, req.DestMac, sizeof(struct sArpRequest4), &req);
        
+       timeout = now() + Interface->TimeoutDelay;
+       
        // Wait for a reply
        for(;;)
        {
-               while(lastID == giARP_LastUpdateID)     Threads_Yield();
+               while(lastID == giARP_LastUpdateID && now() < timeout)
+                       Threads_Yield();
+               
+               if( now() >= timeout )  break;  // Timeout
+               
                lastID = giARP_LastUpdateID;
                
                Mutex_Acquire( &glARP_Cache4 );
@@ -129,6 +152,10 @@ tMacAddr ARP_Resolve4(tInterface *Interface, tIPv4 Address)
                }
                Mutex_Release( &glARP_Cache4 );
        }
+       {
+               tMacAddr        ret = {{0,0,0,0,0,0}};
+               return ret;
+       }
 }
 
 /**
@@ -245,38 +272,30 @@ void ARP_int_GetPacket(tAdapter *Adapter, tMacAddr From, int Length, void *Buffe
        }
        #endif
        
-       Log_Debug("ARP", "Request ID %i", ntohs(req4->Request));
-       
        switch( ntohs(req4->Request) )
        {
        case 1: // You want my IP?
-               Log_Debug("ARP", "ARP Request Address class %i", req4->SWSize);
                // Check what type of IP it is
                switch( req4->SWSize )
                {
                case 4:
-                       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]);
-                       //Log_Debug("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_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 )
                        {
-                               Log_Debug("ARP", "Caching sender's IP Address");
                                ARP_UpdateCache4(req4->SourceIP, req4->SourceMac);
                                
                                req4->DestIP = req4->SourceIP;
                                req4->DestMac = req4->SourceMac;
-                               req4->SourceIP = iface->IP4.Address;
+                               req4->SourceIP = *(tIPv4*)iface->Address;;
                                req4->SourceMac = Adapter->MacAddr;
                                req4->Request = htons(2);
                                Log_Debug("ARP", "Sending back us (%02x:%02x:%02x:%02x:%02x:%02x)",
@@ -301,7 +320,7 @@ void ARP_int_GetPacket(tAdapter *Adapter, tMacAddr From, int Length, void *Buffe
                        {
                                req6->DestIP = req6->SourceIP;
                                req6->DestMac = req6->SourceMac;
-                               req6->SourceIP = iface->IP6.Address;
+                               req6->SourceIP = *(tIPv6*)iface->Address;
                                req6->SourceMac = Adapter->MacAddr;
                                req6->Request = htons(2);
                                Log_Debug("ARP", "Sending back us (%02x:%02x:%02x:%02x:%02x:%02x)",