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3545 hidnplayr 1 
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;                                                                 ;;
5363 yogev_ezra 3 
;; Copyright (C) KolibriOS team 2004-2015. 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: 5522 $
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 
;
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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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5522 hidnplayr 76 
        mov     eax, [esp+4]
3545 hidnplayr 77 
 
5522 hidnplayr 78 
; Update stats
3610 hidnplayr 79 
        inc     [LOOPBACK_DEVICE.packets_rx]
5522 hidnplayr 80 
 
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        mov     ecx, [eax + NET_BUFF.length]
3610 hidnplayr 82 
        add     dword[LOOPBACK_DEVICE.bytes_rx], ecx
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        adc     dword[LOOPBACK_DEVICE.bytes_rx + 4], 0
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5522 hidnplayr 85 
        DEBUGF  DEBUG_NETWORK_VERBOSE, "LOOP_input: ptr=%x size=%u\n", eax, ecx
3545 hidnplayr 86 
 
5522 hidnplayr 87 
; Reverse buffptr and returnaddr on stack
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        pop     edx edi
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        push    edx edi
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91 
; Set registers for protocol handlers
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        lea     edx, [eax + NET_BUFF.data]
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        mov     ebx, [eax + NET_BUFF.device]
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        mov     eax, [eax + NET_BUFF.type]
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; Place protocol handlers here
3600 hidnplayr 97 
        cmp     eax, AF_INET4
3545 hidnplayr 98 
        je      IPv4_input
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5522 hidnplayr 100 
        DEBUGF  DEBUG_NETWORK_VERBOSE, "LOOP_input: Unknown packet type=%x\n", eax
3545 hidnplayr 101 
 
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  .dump:
3556 hidnplayr 103 
        DEBUGF  DEBUG_NETWORK_VERBOSE, "LOOP_input: dumping\n"
5522 hidnplayr 104 
        call    NET_BUFF_free
3545 hidnplayr 105 
        ret
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5522 hidnplayr 107 
 
3545 hidnplayr 108 
;-----------------------------------------------------------------
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;
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; LOOP_output
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;
5522 hidnplayr 112 
; IN:   ecx = packet size
3610 hidnplayr 113 
;       edi = address family
3545 hidnplayr 114 
;
5522 hidnplayr 115 
; OUT:  eax = start of net frame / 0 on error
3610 hidnplayr 116 
;       ebx = to device structure
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;       ecx = unchanged (packet size of embedded data)
5522 hidnplayr 118 
;       edi = start of payload
3545 hidnplayr 119 
;
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;-----------------------------------------------------------------
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align 4
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LOOP_output:
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3556 hidnplayr 124 
        DEBUGF  DEBUG_NETWORK_VERBOSE, "LOOP_output\n"
3545 hidnplayr 125 
 
5522 hidnplayr 126 
        cmp     ecx, [LOOPBACK_DEVICE.mtu]
127 
        ja      .too_large
3545 hidnplayr 128 
 
5522 hidnplayr 129 
        push    ecx edi
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        stdcall NET_BUFF_alloc, ecx
3545 hidnplayr 131 
        test    eax, eax
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        jz      .out_of_ram
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5522 hidnplayr 134 
        pop     edi
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        mov     [eax + NET_BUFF.type], edi
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        mov     ebx, LOOPBACK_DEVICE
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        mov     [eax + NET_BUFF.device], ebx
3545 hidnplayr 138 
        pop     ecx
5522 hidnplayr 139 
        mov     [eax + NET_BUFF.length], ecx
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        lea     edi, [eax + NET_BUFF.data]
3545 hidnplayr 141 
 
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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5522 hidnplayr 146 
        DEBUGF  DEBUG_NETWORK_VERBOSE, "LOOP_output: ptr=%x size=%u\n", eax, ecx
3545 hidnplayr 147 
        ret
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5522 hidnplayr 149 
  .too_large:
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        DEBUGF  DEBUG_NETWORK_ERROR, "LOOP_output: packet is too large\n"
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        xor     eax, eax
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        ret
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3545 hidnplayr 154 
  .out_of_ram:
3610 hidnplayr 155 
        DEBUGF  DEBUG_NETWORK_ERROR, "LOOP_output: out of memory\n"
3600 hidnplayr 156 
        add     esp, 4+4
5522 hidnplayr 157 
        xor     eax, eax
3545 hidnplayr 158 
        ret
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