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;;          GNU GENERAL PUBLIC LICENSE                             ;;
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;;          GNU GENERAL PUBLIC LICENSE                             ;;
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;;             Version 2, June 1991                                ;;
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;;             Version 2, June 1991                                ;;
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;;                                                                 ;;
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;;                                                                 ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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$Revision: 1473 $
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$Revision: 1482 $
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__DEBUG_LEVEL_OLD__  equ __DEBUG_LEVEL__
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__DEBUG_LEVEL_OLD__  equ __DEBUG_LEVEL__
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;-----------------------------------------------------------------
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;-----------------------------------------------------------------
208 
;
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;
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; checksum_1
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; checksum_1
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;
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;
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;  This is the first of two functions needed to calculate the TCP checksum.
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;  This is the first of two functions needed to calculate a checksum.
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;
 212 
;
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;  IN:  edx = start offset for semi-checksum
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;  IN:  edx = start offset for semi-checksum
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;       esi = pointer to data
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;       esi = pointer to data
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;       ecx = data size
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;       ecx = data size
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	add	dh, [esi+0]
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	add	dh, [esi+0]
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	adc	edx, 0
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	adc	edx, 0
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  .end:
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  .end:
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	ret
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	ret
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;IN: 12 bytes of pseudoheader pushed onto the stack
 - 
 
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;    edx = start offset
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;
 - 
 
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; OUT: pseudochecksum in edx
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 - 
 
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 - 
 
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align 4
 - 
 
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checksum_pseudoheader:
 - 
 
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 - 
 
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	add	dl, [esp+5]
 - 
 
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	adc	dh, [esp+4]
 - 
 
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 - 
 
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	adc	dl, [esp+7]
 - 
 
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	adc	dh, [esp+6]
 - 
 
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 - 
 
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	adc	dl, [esp+9]
 - 
 
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	adc	dh, [esp+8]
 - 
 
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 - 
 
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	adc	dl, [esp+11]
 - 
 
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	adc	dh, [esp+10]
 - 
 
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 - 
 
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	adc	dl, [esp+13]
 - 
 
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	adc	dh, [esp+12]
 - 
 
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 - 
 
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	adc	dl, [esp+15]
 - 
 
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	adc	dh, [esp+14]
 - 
 
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 - 
 
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	adc	edx,0
 - 
 
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	ret	12
 - 
 
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 - 
 
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align 4
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checksum_ip_header:
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 - 
 
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; This is the fast procedure to create or check a IP header without options
 - 
 
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;
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; To create a new checksum, the checksum field must be set to 0 before computation
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;
 - 
 
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; To check an existing checksum, leave the checksum as is, and it will be 0 after this procedure, if it was correct
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	xor	edx, edx
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 - 
 
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	add	dl, [esi+1]
 - 
 
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	adc	dh, [esi+0]
 - 
 
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 - 
 
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	adc	dl, [esi+3]
 - 
 
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	adc	dh, [esi+2]
 - 
 
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 - 
 
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	adc	dl, [esi+5]
 - 
 
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	adc	dh, [esi+4]
 - 
 
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 - 
 
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	adc	dl, [esi+7]
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	adc	dh, [esi+6]
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 - 
 
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	adc	dl, [esi+9]
 - 
 
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	adc	dh, [esi+8]
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 - 
 
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; we skip 11th and 12th byte, they are the checksum bytes and should be 0 for re-calculation
 - 
 
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 - 
 
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	adc	dl, [esi+13]
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	adc	dh, [esi+12]
 - 
 
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 - 
 
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	adc	dl, [esi+15]
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	adc	dh, [esi+14]
 - 
 
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 - 
 
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	adc	dl, [esi+17]
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	adc	dh, [esi+16]
 - 
 
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 - 
 
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	adc	dl, [esi+19]
 - 
 
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	adc	dh, [esi+18]
 - 
 
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 - 
 
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	adc	edx, 0
 - 
 
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 - 
 
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	call	checksum_2
 - 
 
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 - 
 
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	neg	word [esi+10]		; zero will stay zero so we jsut get the checksum
 - 
 
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	add	word [esi+10], dx	;  , else we will get (new checksum - old checksum) in the end, wich should be 0 :)
 - 
 
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 - 
 
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	ret
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align 4
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checksum_udp:
 - 
 
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 - 
 
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; This is the fast procedure to create or check a IP header without options
 - 
 
390 
;
 - 
 
391 
; To create a new checksum, the checksum field must be set to 0 before computation
 - 
 
392 
;
 - 
 
393 
; To check an existing checksum, leave the checksum as is, and it will be 0 after this procedure, if it was correct
 - 
 
394 
 
 - 
 
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	xor	edx, edx
 - 
 
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 - 
 
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	add	dl, [esi+1]
 - 
 
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	adc	dh, [esi+0]
 - 
 
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 - 
 
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	adc	dl, [esi+3]
 - 
 
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	adc	dh, [esi+2]
 - 
 
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 - 
 
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	adc	dl, [esi+5]
 - 
 
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	adc	dh, [esi+4]
 - 
 
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 - 
 
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	adc	dl, [esi+7]
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	adc	dh, [esi+6]
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 - 
 
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	adc	dl, [esi+9]
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	adc	dh, [esi+8]
 - 
 
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 - 
 
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; we skip 11th and 12th byte, they are the checksum bytes and should be 0 for re-calculation
 - 
 
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 - 
 
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	adc	dl, [esi+13]
 - 
 
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	adc	dh, [esi+12]
 - 
 
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 - 
 
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	adc	dl, [esi+15]
 - 
 
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	adc	dh, [esi+14]
 - 
 
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 - 
 
420 
	adc	dl, [esi+17]
 - 
 
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	adc	dh, [esi+16]
 - 
 
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 - 
 
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	adc	dl, [esi+19]
 - 
 
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	adc	dh, [esi+18]
 - 
 
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 - 
 
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	adc	edx, 0
 - 
 
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 - 
 
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	call	checksum_2
 - 
 
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 - 
 
430 
	neg	word [esi+10]		; zero will stay zero so we jsut get the checksum
 - 
 
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	add	word [esi+10], dx	;  , else we will get (new checksum - old checksum) in the end, wich should be 0 :)
 - 
 
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 - 
 
433 
	ret
 - 
 
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 - 
 
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 - 
 
436 
 
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437 
;-----------------------------------------------------------------
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;-----------------------------------------------------------------
438 
;
 293 
;
439 
; checksum_2
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; checksum_2
440 
;
 295 
;
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 304 
 
450 
	mov	ecx, edx
 305 
	mov	ecx, edx
451 
	shr	ecx, 16
 306 
	shr	ecx, 16
452 
	and	edx, 0xffff
 307 
	and	edx, 0xffff
- 
 
 308 
	add	edx, ecx
453 
	add	edx, ecx
 309 
 
454 
	mov	eax, edx
 310 
	mov	ecx, edx
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	shr	eax, 16
 311 
	shr	ecx, 16
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456 
	add	edx, eax
 312 
	add	edx, ecx
457 
 
 313 
 
458 
	not	dx
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	not	dx
459 
	jnz	.not_zero
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	jnz	.not_zero