kolibrios/kernel/branches/net/network/loopback.inc

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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Copyright (C) KolibriOS team 2004-2010. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License ;;
;; ;;
;; loopback.inc ;;
;; ;;
;; LoopBack device for KolibriOS ;;
;; ;;
;; Written by hidnplayr@kolibrios.org ;;
;; ;;
;; GNU GENERAL PUBLIC LICENSE ;;
;; Version 2, June 1991 ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
$Revision: 2891 $
iglobal
LOOPBACK_DEVICE:
.type dd NET_TYPE_LOOPBACK
.mtu dd 4096
.name dd .namestr
.unload dd .dummy_fn
.reset dd .dummy_fn
.transmit dd LOOP_input
.bytes_tx dq 0
.bytes_rx dq 0
.packets_tx dd 0
.packets_rx dd 0
.namestr db 'loopback', 0
.dummy_fn:
ret
endg
;-----------------------------------------------------------------
;
; LOOP_input
;
; IN: [esp+4] = Pointer to buffer
; [esp+8] = size of buffer
;
; OUT: /
;
;-----------------------------------------------------------------
align 4
LOOP_input:
pop ebx
pop eax
pop ecx
push ebx
push ecx
push eax
DEBUGF 1,"LOOP_input: size=%u\n", ecx
lea edx, [eax + 2]
mov ax, word[eax]
mov ebx, LOOPBACK_DEVICE
cmp ax, ETHER_IPv4
je IPv4_input
DEBUGF 2,"LOOP_input: Unknown packet type=%x\n", ax
.dump:
DEBUGF 2,"LOOP_input: dumping\n"
call kernel_free
add esp, 4
ret
;-----------------------------------------------------------------
;
; LOOP_output
;
; IN:
; ecx = packet size
; di = protocol
;
; OUT: edi = 0 on error, pointer to buffer otherwise
; eax = buffer start
; ebx = to device structure
; ecx = unchanged (packet size of embedded data)
; edx = size of complete buffer
;
;-----------------------------------------------------------------
align 4
LOOP_output:
DEBUGF 1,"LOOP_output: "
push ecx
push di
add ecx, 2
cmp ecx, [LOOPBACK_DEVICE.mtu]
ja .out_of_ram
stdcall kernel_alloc, ecx
test eax, eax
jz .out_of_ram
mov edi, eax
pop ax
stosw
lea eax, [edi - 2] ; Set eax to buffer start
pop ecx
lea edx, [ecx + 2] ; Set edx to complete buffer size
mov ebx, LOOPBACK_DEVICE
.done:
DEBUGF 1,"ptr=%x size=%u\n", eax, edx
ret
.out_of_ram:
DEBUGF 2,"error\n"
add esp, 2+4
sub edi, edi
ret