BlueGreycalmElegant

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  → /kernel/branches/net/network/stack.inc @ 1481

  → /kernel/branches/net/network/stack.inc @ 1482

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Regard whitespace Rev 1481 → Rev 1482

/kernel/branches/net/network/stack.inc
208,7 → 208,7
;
; checksum_1
;
; This is the first of two functions needed to calculate the TCP checksum.
; This is the first of two functions needed to calculate a checksum.
;
; IN: edx = start offset for semi-checksum
; esi = pointer to data
289,151 → 289,6
.end:
ret
;IN: 12 bytes of pseudoheader pushed onto the stack
; edx = start offset
;
; OUT: pseudochecksum in edx
align 4
checksum_pseudoheader:
add dl, [esp+5]
adc dh, [esp+4]
adc dl, [esp+7]
adc dh, [esp+6]
adc dl, [esp+9]
adc dh, [esp+8]
adc dl, [esp+11]
adc dh, [esp+10]
adc dl, [esp+13]
adc dh, [esp+12]
adc dl, [esp+15]
adc dh, [esp+14]
adc edx,0
ret 12
align 4
checksum_ip_header:
; 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 jsut get the checksum
add word [esi+10], dx ; , else we will get (new checksum - old checksum) in the end, wich should be 0 :)
ret
align 4
checksum_udp:
; 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 jsut get the checksum
add word [esi+10], dx ; , else we will get (new checksum - old checksum) in the end, wich should be 0 :)
ret
;-----------------------------------------------------------------
;
; checksum_2
451,10 → 306,11
shr ecx, 16
and edx, 0xffff
add edx, ecx
mov eax, edx
shr eax, 16
add edx, eax
mov ecx, edx
shr ecx, 16
add edx, ecx
not dx
jnz .not_zero
dec dx