| 77,9 → 77,6 |
|---|
| DEBUGF 1,"UDP_Handler\n" |
| ; First validate, checksum: |
| |
| DEBUGF 1,"Real UDP checksum: %x\n", [edx + UDP_Packet.Checksum]:4 |
| mov [edx + UDP_Packet.Checksum], 0 |
| |
| pusha |
| |
| rol cx, 8 |
| 89,10 → 86,12 |
|---|
| push edi |
| push esi |
| |
| mov di, [edx + UDP_Packet.Checksum] |
| mov [edx + UDP_Packet.Checksum], 0 |
| |
| mov esi, edx |
| xor edx, edx |
| call checksum_1 |
| ; Checksum for pseudoheader |
| mov ecx, 12 |
| mov esi, esp |
| call checksum_1 |
| 99,10 → 98,12 |
|---|
| add esp, 12 |
| call checksum_2 |
| |
| cmp di, dx |
| popa |
| jne .dump |
| |
| DEBUGF 1,"UDP Checksum is correct\n" |
| |
| |
| ; Look for a socket where |
| ; IP Packet UDP Destination Port = local Port |
| ; IP Packet SA = Remote IP |
| 207,8 → 208,7 |
|---|
| |
| sub esp, 8 ; reserve some place in stack for later |
| |
| ; Create the pseudoheader in stack, |
| ; (now that we still have all the variables that are needed.) |
| ; Create a part pseudoheader in stack, |
| push dword IP_PROTO_UDP shl 8 |
| |
| add ecx, UDP_Packet.Data |