kolibrios/kernel/branches/kolibrios-pe-clevermouse/network/loopback.inc

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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Copyright (C) KolibriOS team 2004-2019. 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 ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
$Revision$
iglobal
align 4
LOOPBACK_DEVICE:
.device_type dd NET_DEVICE_LOOPBACK
.mtu dd 4096
.name dd .namestr
.unload dd loop_dummy
.reset dd loop_dummy
.transmit dd loop_input
.bytes_tx dq 0
.bytes_rx dq 0
.packets_tx dd 0
.packets_rx dd 0
.link_state dd -1
.hwacc dd NET_HWACC_TCP_IPv4_IN + NET_HWACC_TCP_IPv4_OUT
.namestr db 'loopback', 0
endg
macro loop_init {
local .fail
mov ebx, LOOPBACK_DEVICE
call net_add_device
cmp eax, -1
je .fail
mov [IPv4_address], 127 + 1 shl 24
mov [IPv4_subnet], 255
mov [IPv4_broadcast], 0xffffff00 + 127
.fail:
}
;-----------------------------------------------------------------;
; ;
; loop_dummy ;
; ;
; IN: / ;
; ;
; OUT: / ;
; ;
;-----------------------------------------------------------------;
align 4
loop_dummy:
ret
;-----------------------------------------------------------------;
; ;
; loop_input ;
; ;
; IN: [esp+4] = Pointer to buffer ;
; ;
; OUT: eax = 0 on success, errorcode otherwise ;
; ;
;-----------------------------------------------------------------;
align 4
loop_input:
mov eax, [esp+4]
; Update stats
inc [LOOPBACK_DEVICE.packets_tx]
inc [LOOPBACK_DEVICE.packets_rx]
mov ecx, [eax + NET_BUFF.length]
add dword[LOOPBACK_DEVICE.bytes_rx], ecx
adc dword[LOOPBACK_DEVICE.bytes_rx + 4], 0
add dword[LOOPBACK_DEVICE.bytes_tx], ecx
adc dword[LOOPBACK_DEVICE.bytes_tx + 4], 0
DEBUGF DEBUG_NETWORK_VERBOSE, "LOOP_input: ptr=%x size=%u\n", eax, ecx
; Reverse buffptr and returnaddr on stack
pop edx edi
push edx .done edi
; Set registers for protocol handlers
lea edx, [eax + NET_BUFF.data]
mov ebx, [eax + NET_BUFF.device]
mov eax, [eax + NET_BUFF.type]
; Place protocol handlers here
cmp eax, AF_INET4
je ipv4_input
DEBUGF DEBUG_NETWORK_VERBOSE, "LOOP_input: Unknown packet type=%x\n", eax
.dump:
DEBUGF DEBUG_NETWORK_VERBOSE, "LOOP_input: dumping\n"
call net_buff_free
or eax, -1
ret
.done:
xor eax, eax
ret
;-----------------------------------------------------------------;
; ;
; loop_output ;
; ;
; IN: ecx = packet size ;
; edi = address family ;
; ;
; OUT: eax = start of net frame / 0 on error ;
; ebx = to device structure ;
; ecx = unchanged (packet size of embedded data) ;
; edi = start of payload ;
; ;
;-----------------------------------------------------------------;
align 4
loop_output:
DEBUGF DEBUG_NETWORK_VERBOSE, "LOOP_output\n"
cmp ecx, [LOOPBACK_DEVICE.mtu]
ja .too_large
push ecx edi
add ecx, NET_BUFF.data
stdcall net_buff_alloc, ecx
test eax, eax
jz .out_of_ram
pop edi
mov [eax + NET_BUFF.type], edi
mov ebx, LOOPBACK_DEVICE
mov [eax + NET_BUFF.device], ebx
pop ecx
mov [eax + NET_BUFF.length], ecx
lea edi, [eax + NET_BUFF.data]
DEBUGF DEBUG_NETWORK_VERBOSE, "LOOP_output: ptr=%x size=%u\n", eax, ecx
ret
.too_large:
DEBUGF DEBUG_NETWORK_ERROR, "LOOP_output: packet is too large\n"
xor eax, eax
ret
.out_of_ram:
DEBUGF DEBUG_NETWORK_ERROR, "LOOP_output: out of memory\n"
add esp, 4+4
xor eax, eax
ret