#include "link.h"
#include "ipv4.h"
+#define DEFAULT_TTL 32
+
// === IMPORTS ===
extern tInterface *gIP_Interfaces;
+extern void ICMP_Initialise();
+extern int ICMP_Ping(tInterface *Interface, tIPv4 Addr);
+extern tMacAddr ARP_Resolve4(tInterface *Interface, tIPv4 Address);
// === PROTOTYPES ===
int IPv4_Initialise();
+ int IPv4_RegisterCallback(int ID, tIPCallback Callback);
void IPv4_int_GetPacket(tAdapter *Interface, tMacAddr From, int Length, void *Buffer);
tInterface *IPv4_GetInterface(tAdapter *Adapter, tIPv4 Address, int Broadcast);
Uint32 IPv4_Netmask(int FixedBits);
+Uint16 IPv4_Checksum(void *Buf, int Size);
+ int IPv4_Ping(tInterface *Iface, tIPv4 Addr);
// === GLOBALS ===
tIPCallback gaIPv4_Callbacks[256];
*/
int IPv4_Initialise()
{
+ ICMP_Initialise();
Link_RegisterType(IPV4_ETHERNET_ID, IPv4_int_GetPacket);
return 1;
}
+/**
+ * \fn int IPv4_RegisterCallback( int ID, tIPCallback Callback )
+ * \brief Registers a callback
+ */
+int IPv4_RegisterCallback(int ID, tIPCallback Callback)
+{
+ if( ID < 0 || ID > 255 ) return 0;
+ if( gaIPv4_Callbacks[ID] ) return 0;
+ gaIPv4_Callbacks[ID] = Callback;
+ return 1;
+}
+
+/**
+ * \brief Creates and sends an IPv4 Packet
+ * \param Iface Interface
+ * \param Address Destination IP
+ * \param Protocol Protocol ID
+ * \param ID Some random ID number
+ * \param Length Data Length
+ * \param Data Packet Data
+ */
+int IPv4_SendPacket(tInterface *Iface, tIPv4 Address, int Protocol, int ID, int Length, void *Data)
+{
+ tMacAddr to = ARP_Resolve4(Iface, Address);
+ int bufSize = sizeof(tIPv4Header) + Length;
+ char buf[bufSize];
+ tIPv4Header *hdr = (void*)buf;
+
+ memcpy(&hdr->Options[0], Data, Length);
+ hdr->Version = 4;
+ hdr->HeaderLength = sizeof(tIPv4Header)/4;
+ hdr->DiffServices = 0; // TODO: Check
+
+ hdr->Reserved = 0;
+ hdr->DontFragment = 0;
+ hdr->MoreFragments = 0;
+ hdr->FragOffLow = 0;
+ hdr->FragOffHi = 0;
+
+ hdr->TotalLength = htons( bufSize );
+ hdr->Identifcation = htons( ID ); // TODO: Check
+ hdr->TTL = DEFAULT_TTL;
+ hdr->Protocol = Protocol;
+ hdr->HeaderChecksum = 0; // Will be set later
+ hdr->Source = Iface->IP4.Address;
+ hdr->Destination = Address;
+ hdr->HeaderChecksum = IPv4_Checksum(hdr, sizeof(tIPv4Header));
+
+ Log_Log("IPv4", "Sending packet to %i.%i.%i.%i",
+ Address.B[0], Address.B[1], Address.B[2], Address.B[3]);
+ Link_SendPacket(Iface->Adapter, IPV4_ETHERNET_ID, to, bufSize, buf);
+ return 1;
+}
+
/**
* \fn void IPv4_int_GetPacket(tInterface *Adapter, tMacAddr From, int Length, void *Buffer)
* \brief Process an IPv4 Packet
int dataLength;
if(Length < sizeof(tIPv4Header)) return;
+ #if 0
+ //Log_Log("IPv4", "Version = %i", hdr->Version);
+ //Log_Log("IPv4", "HeaderLength = %i", hdr->HeaderLength);
+ //Log_Log("IPv4", "DiffServices = %i", hdr->DiffServices);
+ Log_Log("IPv4", "TotalLength = %i", ntohs(hdr->TotalLength) );
+ //Log_Log("IPv4", "Identifcation = %i", ntohs(hdr->Identifcation) );
+ //Log_Log("IPv4", "TTL = %i", hdr->TTL );
+ Log_Log("IPv4", "Protocol = %i", hdr->Protocol );
+ //Log_Log("IPv4", "HeaderChecksum = 0x%x", ntohs(hdr->HeaderChecksum) );
+ Log_Log("IPv4", "Source = %i.%i.%i.%i",
+ hdr->Source.B[0], hdr->Source.B[1], hdr->Source.B[2], hdr->Source.B[3] );
+ Log_Log("IPv4", "Destination = %i.%i.%i.%i",
+ hdr->Destination.B[0], hdr->Destination.B[1],
+ hdr->Destination.B[2], hdr->Destination.B[3] );
+ #endif
+
// Check that the version IS IPv4
- if(hdr->Version != 4) return;
+ if(hdr->Version != 4) {
+ Log_Log("IPv4", "hdr->Version(%i) != 4", hdr->Version);
+ return;
+ }
// Check Header checksum
//TODO
// Check Packet length
- if(hdr->TotalLength > Length) return;
+ if( ntohs(hdr->TotalLength) > Length) {
+ Log_Log("IPv4", "hdr->TotalLength(%i) > Length(%i)", ntohs(hdr->TotalLength), Length);
+ return;
+ }
// Get Interface (allowing broadcasts)
- iface = IPv4_GetInterface(Adapter, hdr->Source, 1);
- if(!iface) return; // Not for us? Well, let's ignore it
+ iface = IPv4_GetInterface(Adapter, hdr->Destination, 1);
+ if(!iface) {
+ Log_Log("IPv4", "Ignoring Packet (Not for us)");
+ return; // Not for us? Well, let's ignore it
+ }
// Defragment
//TODO
- dataLength = hdr->TotalLength - sizeof(tIPv4Header);
+ dataLength = ntohs(hdr->TotalLength) - sizeof(tIPv4Header);
data = &hdr->Options[0];
// Send it on
- gaIPv4_Callbacks[hdr->Protocol] (iface, &hdr->Source, dataLength, data);
+ if( gaIPv4_Callbacks[hdr->Protocol] )
+ gaIPv4_Callbacks[hdr->Protocol] (iface, &hdr->Source, dataLength, data);
+ else
+ Log_Log("IPv4", "Unknown Protocol %i", hdr->Protocol);
}
/**
{
tInterface *iface = NULL;
Uint32 netmask;
+ Uint32 addr, this;
+
+ addr = ntohl( Address.L );
for( iface = gIP_Interfaces; iface; iface = iface->Next)
{
if( !Broadcast ) continue;
+ this = ntohl( iface->IP4.Address.L );
+
// Check for broadcast
netmask = IPv4_Netmask(iface->IP4.SubnetBits);
- if( (Address.L & netmask) == (iface->IP4.Address.L & netmask)
- && (Address.L & ~netmask) == (0xFFFFFFFF & ~netmask) )
+
+ //Log("netmask = 0x%08x", netmask);
+ //Log("addr = 0x%08x", addr);
+ //Log("this = 0x%08x", this);
+ //Log("%08x == %08x && %08x == %08x",
+ // (addr & netmask), (this & netmask),
+ // (addr & ~netmask), (0xFFFFFFFF & ~netmask)
+ // );
+ if( (addr & netmask) == (this & netmask)
+ && (addr & ~netmask) == (0xFFFFFFFF & ~netmask) )
return iface;
}
return NULL;
Uint32 ret = 0xFFFFFFFF;
ret >>= (32-FixedBits);
ret <<= (32-FixedBits);
+ // Returs a little endian netmask
return ret;
}
+
+/**
+ * \brief Calculate the IPv4 Checksum
+ */
+Uint16 IPv4_Checksum(void *Buf, int Size)
+{
+ Uint16 sum = 0;
+ Uint16 *arr = Buf;
+ int i;
+
+ Size = (Size + 1) >> 1;
+ for(i = 0; i < Size; i++ )
+ {
+ if((int)sum + arr[i] > 0xFFFF)
+ sum ++; // Simulate 1's complement
+ sum += arr[i];
+ }
+ return ~sum ;
+}
+
+/**
+ * \brief Sends an ICMP Echo and waits for a reply
+ */
+int IPv4_Ping(tInterface *Iface, tIPv4 Addr)
+{
+ return ICMP_Ping(Iface, Addr);
+}
git.ucc.asn.au / tpg / acess2.git / blobdiff
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