| 140,7 → 140,7 |
|---|
| ; Re-calculate checksum |
| push edx ebx |
| mov esi, edx |
| call checksum_ip_header |
| call IPv4_checksum |
| pop ebx edx |
| |
| ; now see if it was correct |
| 611,7 → 611,7 |
|---|
| |
| push eax edx esi |
| mov esi, edi |
| call checksum_ip_header |
| call IPv4_checksum |
| pop esi edx eax ecx |
| add edi, IPv4_Packet.DataOrOptional |
| |
| 632,7 → 632,59 |
|---|
| |
| |
| |
| align 4 |
| IPv4_checksum: |
| |
| ; This is the fast procedure to create or check a IP header without options |
| ; |
| ; To create a new checksum, the checksum field must be set to 0 before computation |
| ; |
| ; To check an existing checksum, leave the checksum as is, and it will be 0 after this procedure, if it was correct |
| |
| xor edx, edx |
| |
| add dl, [esi+1] |
| adc dh, [esi+0] |
| |
| adc dl, [esi+3] |
| adc dh, [esi+2] |
| |
| adc dl, [esi+5] |
| adc dh, [esi+4] |
| |
| adc dl, [esi+7] |
| adc dh, [esi+6] |
| |
| adc dl, [esi+9] |
| adc dh, [esi+8] |
| |
| ; we skip 11th and 12th byte, they are the checksum bytes and should be 0 for re-calculation |
| |
| adc dl, [esi+13] |
| adc dh, [esi+12] |
| |
| adc dl, [esi+15] |
| adc dh, [esi+14] |
| |
| adc dl, [esi+17] |
| adc dh, [esi+16] |
| |
| adc dl, [esi+19] |
| adc dh, [esi+18] |
| |
| adc edx, 0 |
| |
| call checksum_2 |
| |
| neg word [esi+10] ; zero will stay zero so we just get the checksum |
| add word [esi+10], dx ; , else we will get (new checksum - old checksum) in the end, wich should be 0 :) |
| |
| ret |
| |
| |
| |
| |
| |
| ;--------------------------------------------------------------------------- |
| ; |
| ; IPv4_dest_to_dev |