| 50,22 → 50,20 |
|---|
| } |
| |
| |
| |
| |
| macro UDP_checksum IP1, IP2 { ; esi = ptr to udp packet, ecx = packet size, destroys: ecx, edx |
| |
| ; Pseudoheader |
| mov edx, IP_PROTO_UDP |
| |
| add dl, [IP1+1+4] |
| adc dh, [IP1+0+4] |
| adc dl, [IP1+3+4] |
| adc dh, [IP1+2+4] |
| add dl, [IP1+1] |
| adc dh, [IP1+0] |
| adc dl, [IP1+3] |
| adc dh, [IP1+2] |
| |
| adc dl, [IP2+1+8] |
| adc dh, [IP2+0+8] |
| adc dl, [IP2+3+8] |
| adc dh, [IP2+2+8] |
| adc dl, [IP2+1] |
| adc dh, [IP2+0] |
| adc dl, [IP2+3] |
| adc dh, [IP2+2] |
| |
| adc dl, cl ; byte[esi+UDP_Packet.Length+1] |
| adc dh, ch ; byte[esi+UDP_Packet.Length+0] |
| 123,7 → 121,7 |
|---|
| DEBUGF 1,"UDP_input, size:%u\n", ecx |
| |
| ; First validate, checksum: |
| neg [esi+UDP_Packet.Checksum] ; substract chechksum from 0 |
| neg [edx+UDP_Packet.Checksum] ; substract chechksum from 0 |
| jz .no_checksum ; if checksum is zero, it is considered valid and we continue processing |
| ; otherwise, we will re-calculate the checksum and add it to this value, thus creating 0 when it is correct |
| |