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3545 hidnplayr 1 
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;                                                                 ;;
3610 hidnplayr 3 
;; Copyright (C) KolibriOS team 2004-2013. All rights reserved.    ;;
3545 hidnplayr 4 
;; Distributed under terms of the GNU General Public License       ;;
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;;                                                                 ;;
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;;  loopback.inc                                                   ;;
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;;                                                                 ;;
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;;  LoopBack device for KolibriOS                                  ;;
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;;                                                                 ;;
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;;    Written by hidnplayr@kolibrios.org                           ;;
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;;                                                                 ;;
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;;          GNU GENERAL PUBLIC LICENSE                             ;;
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;;             Version 2, June 1991                                ;;
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;;                                                                 ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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4850 mario79 17 
$Revision: 4850 $
3545 hidnplayr 18 
 
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iglobal
3698 hidnplayr 20 
align 4
3545 hidnplayr 21 
 
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LOOPBACK_DEVICE:
3600 hidnplayr 23 
 
3601 hidnplayr 24 
        .device_type    dd NET_DEVICE_LOOPBACK
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        .mtu            dd 4096
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        .name           dd .namestr
3545 hidnplayr 27 
 
3601 hidnplayr 28 
        .unload         dd .dummy_fn
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        .reset          dd .dummy_fn
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        .transmit       dd LOOP_input
3545 hidnplayr 31 
 
3601 hidnplayr 32 
        .bytes_tx       dq 0
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        .bytes_rx       dq 0
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        .packets_tx     dd 0
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        .packets_rx     dd 0
3545 hidnplayr 36 
 
3601 hidnplayr 37 
        .link_state     dd -1
4388 hidnplayr 38 
        .hwacc          dd NET_HWACC_TCP_IPv4_IN + NET_HWACC_TCP_IPv4_OUT
3545 hidnplayr 39 
 
3601 hidnplayr 40 
        .namestr        db 'loopback', 0
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3545 hidnplayr 42 
        .dummy_fn:
3711 clevermous 43 
        ret
3545 hidnplayr 44 
 
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endg
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3601 hidnplayr 47 
 
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macro   LOOP_init {
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local   .fail
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        mov     ebx, LOOPBACK_DEVICE
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        call    NET_add_device
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        cmp     eax, -1
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        je      .fail
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        mov     [IP_LIST], 127 + 1 shl 24
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        mov     [SUBNET_LIST], 255
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        mov     [BROADCAST_LIST], 0xffffff00 + 127
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  .fail:
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}
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3545 hidnplayr 64 
;-----------------------------------------------------------------
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;
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; LOOP_input
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;
3600 hidnplayr 68 
;  IN:  [esp+4] = Pointer to buffer
3545 hidnplayr 69 
;       [esp+8] = size of buffer
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;
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;  OUT: /
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;
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;-----------------------------------------------------------------
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align 4
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LOOP_input:
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        pop     ebx
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        pop     eax
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        pop     ecx
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        push    ebx
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        push    ecx
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        push    eax
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3610 hidnplayr 84 
        inc     [LOOPBACK_DEVICE.packets_rx]
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        add     dword[LOOPBACK_DEVICE.bytes_rx], ecx
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        adc     dword[LOOPBACK_DEVICE.bytes_rx + 4], 0
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3556 hidnplayr 88 
        DEBUGF  DEBUG_NETWORK_VERBOSE, "LOOP_input: size=%u\n", ecx
3600 hidnplayr 89 
        lea     edx, [eax + 4]
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        mov     eax, dword[eax]
3545 hidnplayr 91 
        mov     ebx, LOOPBACK_DEVICE
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3600 hidnplayr 93 
        cmp     eax, AF_INET4
3545 hidnplayr 94 
        je      IPv4_input
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3556 hidnplayr 96 
        DEBUGF  DEBUG_NETWORK_VERBOSE, "LOOP_input: Unknown packet type=%x\n", ax
3545 hidnplayr 97 
 
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  .dump:
3556 hidnplayr 99 
        DEBUGF  DEBUG_NETWORK_VERBOSE, "LOOP_input: dumping\n"
3861 hidnplayr 100 
        call    NET_packet_free
3545 hidnplayr 101 
        add     esp, 4
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        ret
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;-----------------------------------------------------------------
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;
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; LOOP_output
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;
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; IN:
3610 hidnplayr 109 
;       ecx = packet size
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;       edi = address family
3545 hidnplayr 111 
;
3610 hidnplayr 112 
; OUT:  edi = 0 on error, pointer to buffer otherwise
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;       eax = buffer start
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;       ebx = to device structure
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;       ecx = unchanged (packet size of embedded data)
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;       edx = size of complete buffer
3545 hidnplayr 117 
;
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;-----------------------------------------------------------------
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align 4
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LOOP_output:
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3556 hidnplayr 122 
        DEBUGF  DEBUG_NETWORK_VERBOSE, "LOOP_output\n"
3545 hidnplayr 123 
 
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        push    ecx
3600 hidnplayr 125 
        push    edi
3545 hidnplayr 126 
 
3600 hidnplayr 127 
        add     ecx, 4
3545 hidnplayr 128 
        cmp     ecx, [LOOPBACK_DEVICE.mtu]
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        ja      .out_of_ram
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        stdcall kernel_alloc, ecx
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        test    eax, eax
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        jz      .out_of_ram
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        mov     edi, eax
3600 hidnplayr 134 
        pop     eax
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        stosd
3545 hidnplayr 136 
 
3600 hidnplayr 137 
        lea     eax, [edi - 4]  ; Set eax to buffer start
3545 hidnplayr 138 
        pop     ecx
3600 hidnplayr 139 
        lea     edx, [ecx + 4]  ; Set edx to complete buffer size
3545 hidnplayr 140 
        mov     ebx, LOOPBACK_DEVICE
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3610 hidnplayr 142 
        inc     [LOOPBACK_DEVICE.packets_tx]
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        add     dword[LOOPBACK_DEVICE.bytes_tx], ecx
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        adc     dword[LOOPBACK_DEVICE.bytes_tx + 4], 0
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3556 hidnplayr 146 
        DEBUGF  DEBUG_NETWORK_VERBOSE, "LOOP_output: ptr=%x size=%u\n", eax, edx
3545 hidnplayr 147 
        ret
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  .out_of_ram:
3610 hidnplayr 150 
        DEBUGF  DEBUG_NETWORK_ERROR, "LOOP_output: out of memory\n"
3600 hidnplayr 151 
        add     esp, 4+4
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        xor     edi, edi
3545 hidnplayr 153 
        ret
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