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;---------------------------------------------------------------------------

;

; ARP_decrease_entry_ttls

;

; IN: /

; OUT: /

;

;---------------------------------------------------------------------------

align 4

ARP_decrease_entry_ttls:

	mov	ecx, [NumARP]

	test	ecx, ecx

	jz	.exit

	mov	ebx, ARPTable

.timer_loop:

	movsx	esi, word [ebx + ARP_ENTRY.TTL]

	cmp	esi, 0xFFFFFFFF

	je	.timer_loop_end  ;if TTL==0xFFFF then it's static entry

	test	esi, esi

	jnz	.timer_loop_end_with_dec  ;if TTL!=0

	; Ok, TTL is 0

	;if Status==AWAITING_RESPONSE and TTL==0

	;then we have to change it to ARP_RESPONSE_TIMEOUT

	cmp	word [ebx + ARP_ENTRY.Status], ARP_AWAITING_RESPONSE

	jne	@f

	mov	word [ebx + ARP_ENTRY.Status], ARP_RESPONSE_TIMEOUT

	mov	word [ebx + ARP_ENTRY.TTL], word 0x000A   ;10 sec

	jmp	.timer_loop_end

  @@:

	;if TTL==0 and Status==VALID_MAPPING, we have to delete it

	;if TTL==0 and Status==RESPONSE_TIMEOUT, delete too

	mov	esi, dword[NumARP]

	sub	esi, ecx	  ;esi=index of entry, will be deleted

	call	ARP_del_entry

	jmp	.timer_loop_end

.timer_loop_end_with_dec:

	dec	word [ebx + ARP_ENTRY.TTL]  ;decrease TTL

.timer_loop_end:

	add	ebx, ARP_ENTRY.size

	loop	.timer_loop

.exit:

	ret

;---------------------------------------------------------------------------

;

; ARP_del_entry

;

; IN: entry # in esi

; OUT: /

;

;---------------------------------------------------------------------------

align 4

ARP_del_entry:

	imul	esi, ARP_ENTRY.size

	mov	ecx, (ARP_TABLE_SIZE - 1) * ARP_ENTRY.size

	sub	ecx, esi

	lea	edi, [ebx + esi]	    ;edi=ptr to entry that should be deleted

	lea	esi, [edi + ARP_ENTRY.size] ;esi=ptr to next entry

	shr	ecx,1	   ;ecx/2 => ARP_ENTRY_SIZE MUST BE EVEN NUMBER!

	cld

	rep	movsw

	dec	dword[NumARP] ;decrease arp-entries counter

	ret