Subversion Repositories Kolibri OS

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;;                                                              ;;

;; Copyright (C) KolibriOS team 2012. All rights reserved.      ;;

;; Distributed under terms of the GNU General Public License    ;;

;;                                                              ;;

;;  PPPoE.INC                                                   ;;

;;                                                              ;;

;;  Part of the tcp/ip network stack for KolibriOS              ;;

;;                                                              ;;

;;    Written by hidnplayr@kolibrios.org                        ;;

;;                                                              ;;

;;          GNU GENERAL PUBLIC LICENSE                          ;;

;;             Version 2, June 1991                             ;;

;;                                                              ;;

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

struct  PPPoE_frame

        VersionAndType  db ?

        Code            db ?

        SessionID       dw ?

        Length          dw ?            ; Length of payload, does NOT include the length PPPoE header.

        Payload         rb 0

ends

uglobal

        PPPoE_SID       dw ?

        PPPoE_MAC       dp ?

endg

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

;

; PPPoE_init

;

;  This function resets all IP variables

;

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

macro   PPPoE_init {

        call    PPPoE_stop_connection

}

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

;

; PPPoE discovery input

;

; Handler of received Ethernet packet with type = Discovery

;

;

;  IN:  Pointer to buffer in [esp]

;       size of buffer in [esp+4]

;       pointer to device struct in ebx

;       pointer to PPP header in edx

;       size of PPP packet in ecx

;  OUT: /

;

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

align 4

PPPoE_discovery_input:

        DEBUGF  2,"PPPoE_discovery_input\n"

; First, find open PPPoE socket

        mov     eax, net_sockets

  .next_socket:

        mov     eax, [eax + SOCKET.NextPtr]

        or      eax, eax

        jz      .dump

        cmp     [eax + SOCKET.Domain], AF_PPP

        jne     .next_socket

        cmp     [eax + SOCKET.Protocol], PPP_PROTO_ETHERNET

        jne     .next_socket

; Now, send it to the this socket

        mov     ecx, [esp + 4]

        mov     esi, [esp]

        jmp     SOCKET_input

  .dump:

        DEBUGF 1,'PPPoE_discovery_input: dumping\n'

        call    kernel_free

        add     esp, 4

        ret

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

;

; Send discovery packet

;

; IN: eax = socket pointer

;     ecx = number of bytes to send

;     esi = pointer to data

;

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

align 4

PPPoE_discovery_output:

        DEBUGF  2,"PPPoE_discovery_output: socket=%x buffer=%x size=%d\n", eax, esi, ecx

; RFC2516: An entire PADI packet (including the PPPoE header) MUST NOT

; exceed 1484 octets.

        cmp     ecx, 1484 + 14

        ja      .bad

; Check that device exists and is ethernet device

        mov     ebx, [eax + SOCKET.device]

        cmp     ebx, MAX_NET_DEVICES

        ja      .bad

        mov     ebx, [NET_DRV_LIST + 4*ebx]

        test    ebx, ebx

        jz      .bad

        cmp     [ebx + NET_DEVICE.type], NET_TYPE_ETH

        jne     .bad

        DEBUGF  2,"PPPoE_discovery_output: device=%x\n", ebx

; Create packet.

        push    ecx esi

        stdcall kernel_alloc, 1500

        pop     esi ecx

        test    eax, eax

        jz      .bad

        mov     edx, ecx

        mov     edi, eax

        rep     movsb

        cmp     edx, 60         ; Min ETH size

        ja      @f

        mov     edx, 60

       @@:

        push    edx eax         ; size and packet ptr for driver send proc

; Overwrite source MAC and protocol type

        lea     edi, [eax + ETH_header.SrcMAC]

        lea     esi, [ebx + ETH_DEVICE.mac]

        movsd

        movsw

        cmp     word[edi], ETHER_PPP_SESSION    ; Allow only PPP_discovery, or LCP

        je      @f

        mov     ax, ETHER_PPP_DISCOVERY

        stosw

       @@:

; And send the packet

        call    [ebx + NET_DEVICE.transmit]

        xor     eax, eax

        ret

  .bad:

        or      eax, -1

        ret

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

;

; PPPoE session input

;

; Handler of received Ethernet packet with type = Session

;

;

;  IN:  Pointer to buffer in [esp]

;       size of buffer in [esp+4]

;       pointer to device struct in ebx

;       pointer to PPP header in edx

;       size of PPP packet in ecx

;  OUT: /

;

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

align 4

PPPoE_session_input:

        cmp     [edx + PPPoE_frame.VersionAndType], 0x11

        jne     .dump

        cmp     [edx + PPPoE_frame.Code], 0x00

        jne     .dump

        movzx   ecx, [edx + PPPoE_frame.Length]

        xchg    cl, ch

        mov     ax, [edx + PPPoE_frame.SessionID]

        DEBUGF  2,"PPPoE_input: session ID=%x, length=%u\n", ax, cx

        cmp     ax, [PPPoE_SID]

        jne     .dump

        mov     ax, word [edx + PPPoE_frame.Payload]

        add     edx, PPPoE_frame.Payload + 2

        cmp     ax, PPP_IPv4

        je      IPv4_input

        cmp     ax, PPP_LCP

        je      PPPoE_discovery_input   ; Send LCP packets to the PPP dialer

        DEBUGF  2,"PPPoE_input: Unknown protocol=%x\n", ax

  .dump:

        DEBUGF  2,"PPPoE_input: dumping\n"

        call    kernel_free

        add     esp, 4

        ret

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

;

; PPPoE_output

;

; IN:

;     ebx = device ptr

;     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

PPPoE_output:

        DEBUGF  1,"PPPoE_output: size=%u device=%x\n", ecx, ebx

        pushw   di

        pushw   [PPPoE_SID]

        lea     eax, [ebx + ETH_DEVICE.mac]

        lea     edx, [PPPoE_MAC]

        add     ecx, PPPoE_frame.Payload + 2

        mov     di, ETHER_PPP_SESSION

        call    ETH_output

        jz      .eth_error

        sub     ecx, PPPoE_frame.Payload

        mov     [edi + PPPoE_frame.VersionAndType], 0x11

        mov     [edi + PPPoE_frame.Code], 0

        popw    [edi + PPPoE_frame.SessionID]

        xchg    cl, ch

        mov     [edi + PPPoE_frame.Length], cx

        xchg    cl, ch

        pop     word [edi + PPPoE_frame.Payload]

        sub     ecx, 2

        add     edi, PPPoE_frame.Payload + 2

        DEBUGF  1,"PPPoE_output: success!\n"

        ret

  .eth_error:

        add     esp, 4

        xor     edi, edi

        ret

PPPoE_start_connection:

        DEBUGF  2,"PPPoE_start_connection: %x\n", cx

        cmp     [PPPoE_SID], 0

        jne     .fail

        mov     [PPPoE_SID], cx

        mov     dword [PPPoE_MAC], edx

        mov     word [PPPoE_MAC + 4], si

        xor     eax, eax

        ret

  .fail:

        or      eax, -1

        ret

align 4

PPPoE_stop_connection:

        DEBUGF  2,"PPPoE_stop_connection\n"

        xor     eax, eax

        mov     [PPPoE_SID], ax

        mov     dword [PPPoE_MAC], eax

        mov     word [PPPoE_MAC + 4], ax

        ret

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

;

; PPPoE API

;

; This function is called by system function 75

;

; IN:  subfunction number in bl

;      device number in bh

;      ecx, edx, .. depends on subfunction

;

; OUT:

;

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

align 4

PPPoE_api:

        movzx   eax, bh

        shl     eax, 2

        and     ebx, 0xff

        cmp     ebx, .number

        ja      .error

        jmp     dword [.table + 4*ebx]

  .table:

        dd      PPPoE_start_connection  ; 0

        dd      PPPoE_stop_connection   ; 1

  .number = ($ - .table) / 4 - 1

  .error:

        mov     eax, -1

        ret