#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);
// === PROTOTYPES ===
int IPv4_Initialise();
length = IPStack_Buffer_GetLength(Buffer);
// --- Resolve destination MAC address
- to = ARP_Resolve4(Iface, Address);
+ 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;
}
// 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]
);
+ #endif
// Get Data and Data Length
dataLength = ntohs(hdr->TotalLength) - sizeof(tIPv4Header);
}
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)
{
- tMacAddr to;
- tRoute *rt;
-
- 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);
-
+ //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] ) {
*/
tInterface *IPv4_GetInterface(tAdapter *Adapter, tIPv4 Address, int Broadcast)
{
- tInterface *iface = NULL;
+ tInterface *iface = NULL, *zero_iface = NULL;
Uint32 netmask;
Uint32 addr, this;
LEAVE('p', iface);
return iface;
}
-
+
+ LOG("iface->Address = 0x%x", *(Uint32*)iface->Address);
+
+ if( *(Uint32*)iface->Address == 0 ) {
+ if( zero_iface ) {
+ Log_Notice("IPv4", "Multiple 0.0.0.0 interfaces on the same adapter, ignoring");
+ }
+ else {
+ zero_iface = iface;
+ LOG("Zero IF %p", iface);
+ }
+ continue ;
+ }
+
if( !Broadcast ) continue;
// Check for broadcast
return iface;
}
}
+
+ // Special case for intefaces that are being DHCP configured
+ // - If the interface address is 0.0.0.0, then if there is no match for the
+ // destination the packet is treated as if it was addressed to 0.0.0.0
+ if( zero_iface && Broadcast )
+ {
+ LOG("Using 0.0.0.0 interface with magic!");
+ LEAVE('p', zero_iface);
+ return zero_iface;
+ }
+
LEAVE('n');
return NULL;
}
*/
Uint16 IPv4_Checksum(const void *Buf, size_t Length)
{
+ //Debug_HexDump("IPv4_Checksum", Buf, Length);
const Uint16 *words = Buf;
Uint32 sum = 0;
int i;