#include "ipstack.h"
#include "link.h"
#include "ipv4.h"
+#include "hwaddr_cache.h"
#include "firewall.h"
+// === CONSTANTS ===
#define DEFAULT_TTL 32
+#define IPV4_TRACE 1 // set to 1 to enable packet tracing
// === 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);
-extern void ARP_UpdateCache4(tIPv4 SWAddr, tMacAddr HWAddr);
// === PROTOTYPES ===
int IPv4_Initialise();
- int IPv4_RegisterCallback(int ID, tIPCallback Callback);
+// int IPv4_RegisterCallback(int ID, tIPRxCallback 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);
int IPv4_Ping(tInterface *Iface, tIPv4 Addr);
// === GLOBALS ===
-tIPCallback gaIPv4_Callbacks[256];
+struct {
+ tIPRxCallback* rx_cb;
+ tIPErrorCallback* err_cb;
+} gaIPv4_Callbacks[256];
// === CODE ===
/**
* \param ID 8-bit packet type ID
* \param Callback Callback function
*/
-int IPv4_RegisterCallback(int ID, tIPCallback Callback)
+int IPv4_RegisterCallback(int ID, tIPRxCallback *RxCallback, tIPErrorCallback *ErrCallback)
{
if( ID < 0 || ID > 255 ) return 0;
- if( gaIPv4_Callbacks[ID] ) return 0;
- gaIPv4_Callbacks[ID] = Callback;
+ if( gaIPv4_Callbacks[ID].rx_cb ) return 0;
+ gaIPv4_Callbacks[ID].rx_cb = RxCallback;
+ gaIPv4_Callbacks[ID].err_cb = ErrCallback;
return 1;
}
*/
int IPv4_SendPacket(tInterface *Iface, tIPv4 Address, int Protocol, int ID, tIPStackBuffer *Buffer)
{
- tMacAddr to;
tIPv4Header hdr;
- int length;
- length = IPStack_Buffer_GetLength(Buffer);
+ int length = IPStack_Buffer_GetLength(Buffer);
// --- Resolve destination MAC address
- to = ARP_Resolve4(Iface, Address);
+ tMacAddr to = HWCache_Resolve(Iface, &Address);
if( MAC_EQU(to, cMAC_ZERO) ) {
// No route to host
Log_Notice("IPv4", "No route to host %i.%i.%i.%i",
IPStack_Buffer_AppendSubBuffer(Buffer, sizeof(tIPv4Header), 0, &hdr, NULL, NULL);
+ #if IPV4_TRACE
Log_Log("IPv4", "Sending packet to %i.%i.%i.%i",
Address.B[0], Address.B[1], Address.B[2], Address.B[3]);
+ #endif
Link_SendPacket(Iface->Adapter, IPV4_ETHERNET_ID, to, Buffer);
return 1;
}
void IPv4_int_GetPacket(tAdapter *Adapter, tMacAddr From, int Length, void *Buffer)
{
tIPv4Header *hdr = Buffer;
- tInterface *iface;
Uint8 *data;
int dataLength;
int ret;
// TODO: Handle packet fragmentation
- Log_Debug("IPv4", " From %i.%i.%i.%i to %i.%i.%i.%i",
+ #if IPV4_TRACE
+ Log_Debug("IPv4", "Proto 0x%x From %i.%i.%i.%i to %i.%i.%i.%i",
+ hdr->Protocol,
hdr->Source.B[0], hdr->Source.B[1], hdr->Source.B[2], hdr->Source.B[3],
hdr->Destination.B[0], hdr->Destination.B[1], hdr->Destination.B[2], hdr->Destination.B[3]
);
-
- // TODO: Tell ARP?
- ARP_UpdateCache4(hdr->Source, From);
+ #endif
// Get Data and Data Length
dataLength = ntohs(hdr->TotalLength) - sizeof(tIPv4Header);
data = &hdr->Options[0];
// Get Interface (allowing broadcasts)
- iface = IPv4_GetInterface(Adapter, hdr->Destination, 1);
+ tInterface *iface = IPv4_GetInterface(Adapter, hdr->Destination, 1);
// Firewall rules
if( iface ) {
}
else {
// Routed packets
+ // Drop the packet if the TTL is zero
+ if( hdr->TTL == 0 ) {
+ Log_Warning("IPv4", "TODO: Send ICMP-Timeout when TTL exceeded");
+ return ;
+ }
+ hdr->TTL --;
+
ret = IPTables_TestChain("FORWARD",
4, &hdr->Source, &hdr->Destination,
hdr->Protocol, 0,
// Routing
if(!iface)
{
- #if 0
- tMacAddr to;
- tRoute *rt;
-
-
- // TODO: Put this in another thread to avoid delays in the RX thread
- Log_Debug("IPv4", "Route the packet");
- // Drop the packet if the TTL is zero
- if( hdr->TTL == 0 ) {
- Log_Warning("IPv4", "TODO: Send ICMP-Timeout when TTL exceeded");
- return ;
- }
-
- hdr->TTL --;
-
- rt = IPStack_FindRoute(4, NULL, &hdr->Destination); // Get the route (gets the interface)
- if( !rt || !rt->Interface )
- return ;
- to = ARP_Resolve4(rt->Interface, hdr->Destination); // Resolve address
- if( MAC_EQU(to, cMAC_ZERO) )
- return ;
-
- // Send packet
- Log_Log("IPv4", "Forwarding packet to %i.%i.%i.%i (via %i.%i.%i.%i)",
- hdr->Destination.B[0], hdr->Destination.B[1],
- hdr->Destination.B[2], hdr->Destination.B[3],
- ((tIPv4*)rt->NextHop)->B[0], ((tIPv4*)rt->NextHop)->B[1],
- ((tIPv4*)rt->NextHop)->B[2], ((tIPv4*)rt->NextHop)->B[3]);
- Log_Warning("IPv4", "TODO: Implement forwarding with tIPStackBuffer");
-// Link_SendPacket(rt->Interface->Adapter, IPV4_ETHERNET_ID, to, Length, Buffer);
- #endif
-
+ //IPStack_RoutePacket(4, &hdr->Destination, Length, Buffer);
return ;
}
+
+ // Populate ARP cache from recieved packets
+ // - Should be safe
+ if( IPStack_CompareAddress(4, &hdr->Source, iface->Address, iface->SubnetBits) )
+ {
+ HWCache_Set(Adapter, 4, &hdr->Source, &From);
+ }
// Send it on
- if( !gaIPv4_Callbacks[hdr->Protocol] ) {
+ if( !gaIPv4_Callbacks[hdr->Protocol].rx_cb ) {
Log_Log("IPv4", "Unknown Protocol %i", hdr->Protocol);
return ;
}
- gaIPv4_Callbacks[hdr->Protocol]( iface, &hdr->Source, dataLength, data );
+ gaIPv4_Callbacks[hdr->Protocol].rx_cb( iface, &hdr->Source, dataLength, data );
+}
+
+/*
+ * Handles an error from the ICMPv4 code, 'Buf' contains part of an IPv4 packet
+ */
+void IPv4_HandleError(tInterface *Iface, tIPErrorMode Mode, size_t Length, const void *Buf)
+{
+ if(Length < sizeof(tIPv4Header)) return;
+ const tIPv4Header* hdr = Buf;
+ if(hdr->Version != 4) return;
+
+ // Get Data and Data Length
+ size_t dataLength = MIN(Length, ntohs(hdr->TotalLength)) - sizeof(tIPv4Header);
+ const void *data = &hdr->Options[0];
+
+ if( gaIPv4_Callbacks[hdr->Protocol].err_cb )
+ gaIPv4_Callbacks[hdr->Protocol].err_cb(Iface, Mode, &hdr->Source, dataLength, data);
}
/**
*/
tInterface *IPv4_GetInterface(tAdapter *Adapter, tIPv4 Address, int Broadcast)
{
- tInterface *iface = NULL, *zero_iface = NULL;
- Uint32 netmask;
- Uint32 addr, this;
+ tInterface *zero_iface = NULL;
ENTER("pAdapter xAddress bBroadcast", Adapter, Address, Broadcast);
- addr = ntohl( Address.L );
+ Uint32 addr = ntohl( Address.L );
LOG("addr = 0x%x", addr);
- for( iface = gIP_Interfaces; iface; iface = iface->Next)
+ for( tInterface *iface = gIP_Interfaces; iface; iface = iface->Next)
{
if( iface->Adapter != Adapter ) continue;
if( iface->Type != 4 ) continue;
if( !Broadcast ) continue;
// Check for broadcast
- this = ntohl( ((tIPv4*)iface->Address)->L );
- netmask = IPv4_Netmask(iface->SubnetBits);
+ Uint32 this = ntohl( ((tIPv4*)iface->Address)->L );
+ Uint32 netmask = IPv4_Netmask(iface->SubnetBits);
LOG("iface addr = 0x%x, netmask = 0x%x (bits = %i)", this, netmask, iface->SubnetBits);
if( (addr & netmask) == (this & netmask) && (addr & ~netmask) == (0xFFFFFFFF & ~netmask) )
*/
Uint16 IPv4_Checksum(const void *Buf, size_t Length)
{
+ //Debug_HexDump("IPv4_Checksum", Buf, Length);
const Uint16 *words = Buf;
Uint32 sum = 0;
int i;
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