Subversion Repositories Kolibri OS

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

;;                                                                 ;;

;; Copyright (C) KolibriOS team 2004-2007. All rights reserved.    ;;

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

;;                                                                 ;;

;;  ETHERNET.INC                                                   ;;

;;                                                                 ;;

;;  Ethernet network layer for Menuet OS                           ;;

;;                                                                 ;;

;;  Version 0.4  22 September 2003                                 ;;

;;                                                                 ;;

;;  This file contains the following:                              ;;

;;      PCI bus scanning for valid devices                         ;;

;;      Table of supported ethernet drivers                        ;;

;;      Code to identify and activate a supported driver           ;;

;;      ARP handler                                                ;;

;;      Driver interface to the IP layer                           ;;

;;      Gateway support                                            ;;

;;                                                                 ;;

;;  Individual driver files are included here                      ;;

;;                                                                 ;;

;;  The PCI bus scanning code was ported from the etherboot        ;;

;;  5.0.6 project. The copyright statement for that code is        ;;

;;                                                                 ;;

;;          GNU GENERAL PUBLIC LICENSE                             ;;

;;             Version 2, June 1991                                ;;

;;                                                                 ;;

;;  remaining parts Copyright 2002 Mike Hibbett                    ;;

;;   mikeh@oceanfree.net                                           ;;

;;                                                                 ;;

;;  See file COPYING for details                                   ;;

;;                                                                 ;;

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

$Revision: 869 $

;********************************************************************

;   Interface

;      ethernet_driver   called by stack_handler in stack.inc

;      eth_probe         called by app_stack_handler in stack.inc

;

;********************************************************************

ETHER_IP		    equ     0x0008	; Reversed from 0800 for intel

ETHER_ARP		    equ     0x0608	; Reversed from 0806 for intel

ETHER_RARP		    equ     0x3580

struc ETH_FRAME

{  .DstMAC	 dp   ?  ;destination MAC-address [6 bytes]

   .SrcMAC	 dp   ?  ;source MAC-address [6 bytes]

   .Type	 dw   ?  ;type of the upper-layer protocol [2 bytes]

   .Data	 db   ?  ;data [46-1500 bytes]

}

virtual at Ether_buffer

  ETH_FRAME ETH_FRAME

end virtual

; Some useful information on data structures

;     Ethernet Packet - ARP Request example

;

;   0                   1                   2                   3

;   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

;

;   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

;   |       Dest   H/W Address                                      |

;   |                    ( 14 byte header )                         |

;   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

;   |                               |     Source     H/W Address    |

;   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

;   |                                                               |

;   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

;   |    Protocol - ARP 08  06      |

;   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

;   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

;   |  H/W Type  00           01    |  Protocol Type   08 00        |

;   |                   ( ARP Request packet )                      |

;   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

;   | HLen    0x06  | PLen    0x04  |    OpCode        00   01      |

;   |               ( 0001 for request, 0002 for reply )            |

;   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

;   | Source Hardware Address ( MAC Address )                       |

;   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

;   |                               |  Source IP Address            |

;   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

;   |                               | Destination Hardware Address  |

;   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

;   |                                                               |

;   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

;   | Destination IP Address                                        |

;   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

; Include individual drivers source files at this point.

; If you create a new driver, include it below.

include "drivers/rtl8029.inc"

include "drivers/i8255x.inc"

include "drivers/rtl8139.inc"

include "drivers/3c59x.inc"

include "drivers/sis900.inc"

include "drivers/pcnet32.inc"

include "drivers/rtl8169.inc"

include "drivers/forcedeth.inc"

; PCICards

; ========

; PCI vendor and hardware types for hardware supported by the above drivers

; If you add a driver, ensure you update this datastructure, otherwise the

; card will not be probed.

; Each driver is defined by 4 double words. These are

;   PCIVendorDevice  probeFunction ResetFunction PollFunction transmitFunction

; The last entry must be kept at all zeros, to indicate the end of the list

; As a PCI driver may support more than one hardware implementation, there may

; be several lines which refer to the same functions.

; The first driver found on the PCI bus will be the one used.

PCICARDS_ENTRY_SIZE	    equ     24	  ; Size of each PCICARDS entry

iglobal

PCICards:

dd  0x12098086, I8255x_probe, I8255x_reset, I8255x_poll, I8255x_transmit, 0

dd  0x10298086, I8255x_probe, I8255x_reset, I8255x_poll, I8255x_transmit, 0

dd  0x12298086, I8255x_probe, I8255x_reset, I8255x_poll, I8255x_transmit, 0

dd  0x10308086, I8255x_probe, I8255x_reset, I8255x_poll, I8255x_transmit, 0

dd  0x24498086, I8255x_probe, I8255x_reset, I8255x_poll, I8255x_transmit, 0

dd  0x802910ec, rtl8029_probe, rtl8029_reset, rtl8029_poll, rtl8029_transmit, 0

dd  0x813910ec, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable  ; tested by hidnplayr: works ok

dd  0x813810ec, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable

dd  0x12111113, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable  ; tested by hidnplayr: works ok

dd  0x13601500, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable

dd  0x13604033, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable

dd  0x13001186, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable

dd  0x13401186, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable

dd  0xab0613d1, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable

dd  0xa1171259, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable

dd  0xa11e1259, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable

dd  0xab0614ea, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable

dd  0xab0714ea, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable

dd  0x123411db, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable

dd  0x91301432, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable

dd  0x101202ac, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable

dd  0x0106018a, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable

dd  0x1211126c, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable

dd  0x81391743, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable

dd  0x8139021b, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable

dd  0x816810ec, rtl8169_probe, rtl8169_reset, rtl8169_poll, rtl8169_transmit, 0

dd  0x816910ec, rtl8169_probe, rtl8169_reset, rtl8169_poll, rtl8169_transmit, 0

dd  0x011616ec, rtl8169_probe, rtl8169_reset, rtl8169_poll, rtl8169_transmit, 0

dd  0x43001186, rtl8169_probe, rtl8169_reset, rtl8169_poll, rtl8169_transmit, 0

dd  0x816710ec, rtl8169_probe, rtl8169_reset, rtl8169_poll, rtl8169_transmit, 0

dd  0x590010b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x592010b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x597010b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x595010b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x595110b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x595210b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x900010b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x900110b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x900410b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x900510b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x900610b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x900A10b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x905010b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x905110b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x905510b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x905810b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x905A10b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x920010b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x980010b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x980510b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x764610b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x505510b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x605510b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x605610b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x5b5710b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x505710b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x515710b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x525710b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x656010b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x656210b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x656410b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x450010b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0

dd  0x09001039, SIS900_probe, SIS900_reset, SIS900_poll, SIS900_transmit, 0

dd  0x20001022, pcnet32_probe, pcnet32_reset, pcnet32_poll, pcnet32_xmit, 0

dd  0x26251022, pcnet32_probe, pcnet32_reset, pcnet32_poll, pcnet32_xmit, 0

dd  0x20011022, pcnet32_probe, pcnet32_reset, pcnet32_poll, pcnet32_xmit, 0

;dd  0x08031516, mtd80x_probe, mtd80x_reset, mtd80x_poll, mtd80x_transmit, mtd80x_cable

; following cards are untested

dd  0x70161039, SIS900_probe, SIS900_reset, SIS900_poll, SIS900_transmit, 0

;dd  0x08001516, mtd80x_probe, mtd80x_reset, mtd80x_poll, mtd80x_transmit, mtd80x_cable

;dd  0x08911516, mtd80x_probe, mtd80x_reset, mtd80x_poll, mtd80x_transmit, mtd80x_cable

dd 0x006610de, forcedeth_probe, forcedeth_reset, forcedeth_poll, forcedeth_transmit, forcedeth_cable ; nVidia Corporation nForce2 Ethernet Controller

dd 0x01c310de, forcedeth_probe, forcedeth_reset, forcedeth_poll, forcedeth_transmit, forcedeth_cable ; not tested

dd 0x00D610de, forcedeth_probe, forcedeth_reset, forcedeth_poll, forcedeth_transmit, forcedeth_cable ; not tested

dd 0x008610de, forcedeth_probe, forcedeth_reset, forcedeth_poll, forcedeth_transmit, forcedeth_cable ; not tested

dd 0x008c10de, forcedeth_probe, forcedeth_reset, forcedeth_poll, forcedeth_transmit, forcedeth_cable ; not tested

dd 0x00e610de, forcedeth_probe, forcedeth_reset, forcedeth_poll, forcedeth_transmit, forcedeth_cable ; not tested

dd 0x00df10de, forcedeth_probe, forcedeth_reset, forcedeth_poll, forcedeth_transmit, forcedeth_cable ; not tested

dd 0x005610de, forcedeth_probe, forcedeth_reset, forcedeth_poll, forcedeth_transmit, forcedeth_cable ; not tested

dd 0x005710de, forcedeth_probe, forcedeth_reset, forcedeth_poll, forcedeth_transmit, forcedeth_cable ; not tested

dd 0x003710de, forcedeth_probe, forcedeth_reset, forcedeth_poll, forcedeth_transmit, forcedeth_cable ; not tested

dd 0x003810de, forcedeth_probe, forcedeth_reset, forcedeth_poll, forcedeth_transmit, forcedeth_cable ; not tested

dd 0x026810de, forcedeth_probe, forcedeth_reset, forcedeth_poll, forcedeth_transmit, forcedeth_cable ; not tested

dd 0x026910de, forcedeth_probe, forcedeth_reset, forcedeth_poll, forcedeth_transmit, forcedeth_cable ; not tested

dd 0x037210de, forcedeth_probe, forcedeth_reset, forcedeth_poll, forcedeth_transmit, forcedeth_cable ; not tested

dd 0x037310de, forcedeth_probe, forcedeth_reset, forcedeth_poll, forcedeth_transmit, forcedeth_cable ; not tested

rb PCICARDS_ENTRY_SIZE	; end of list marker, do not remove

endg

uglobal

;Net-stack's interface's settings

  node_addr:	      db  0,0,0,0,0,0

  gateway_ip:	      dd  0

  dns_ip:	      dd  0

  eth_rx_data_len:    dw  0

  eth_status:	      dd  0

  io_addr:	      dd  0

  hdrtype:	      db  0

  vendor_device:      dd  0

  pci_data:	      dd  0

  pci_dev:	      dd  0

  pci_bus:	      dd  0

  ; These will hold pointers to the selected driver functions

  drvr_probe:	      dd  0

  drvr_reset:	      dd  0

  drvr_poll:	      dd  0

  drvr_transmit:      dd  0

  drvr_cable:	      dd  0

endg

iglobal

  broadcast_add:      db  0xff,0xff,0xff,0xff,0xff,0xff

  subnet_mask:	      dd  0x00ffffff   ; 255.255.255.0

endg

include "arp.inc"    ;arp-protocol functions

include "pci.inc"    ;PCI bus access functions

;***************************************************************************

;   Function

;      eth_tx

;

;   Description

;      Looks at the NET1OUT_QUEUE for data to send.

;      Stores that destination IP in a location used by the tx routine

;      Looks up the MAC address in the ARP table; stores that where

;      the tx routine can get it

;      Get the length of the data. Store that where the tx routine wants it

;      Call tx

;      Places buffer on empty queue when the tx routine finished

;

;***************************************************************************

proc eth_tx stdcall uses ebx esi edi

local MACAddress  dp  ?  ;allocate 6 bytes in the stack

    ; Look for a buffer to tx

    mov     eax, NET1OUT_QUEUE

    call    dequeue

    cmp     ax, NO_BUFFER

    je	    .exit	     ; Exit if no buffer available

    push    eax  ;save buffer number

    ; convert buffer pointer eax to the absolute address

    imul    eax, IPBUFFSIZE

    add     eax, IPbuffs

    ; Extract the destination IP

    ; find the destination IP in the ARP table, get MAC

    ; store this MAC in 'MACAddress'

    mov     ebx, eax		   ; Save buffer address

    mov     edx, [ebx + 16]	   ; get destination address

    ; If the destination address is 255.255.255.255,

    ; set the MACAddress to all ones ( broadcast )

    cld

    mov     esi, broadcast_add

    lea     edi, [MACAddress]

    movsd

    movsw

    cmp     edx, 0xffffffff

    je	    .send		 ; If it is broadcast, just send

    lea     eax, [MACAddress]	 ;cause this is local variable

    stdcall arp_table_manager, ARP_TABLE_IP_TO_MAC, edx, eax ;opcode,IP,MAC_ptr - Get the MAC address.

    cmp     eax, ARP_VALID_MAPPING

    je	    .send

    ; No valid entry. Has the request been sent, but timed out?

    cmp     eax, ARP_RESPONSE_TIMEOUT

    je	    .freebuf

  .wait_response:		    ;we wait arp-response

				    ; Re-queue the packet, and exit

    pop     ebx

    mov     eax, NET1OUT_QUEUE

    call    queue			 ; Get the buffer back

    jmp     .exit

  .send:    ;if ARP_VALID_MAPPING then send the packet

    lea     edi, [MACAddress]	  ; Pointer to 48 bit destination address

    movzx   ecx, word[ebx+2]	  ; Size of IP packet to send

    xchg    ch, cl		  ; because mirror byte-order

    mov     esi, ebx		  ; Pointer to packet data

    mov     bx, ETHER_IP	  ; Type of packet

    push    ebp

    call    dword [drvr_transmit] ; Call the drivers transmit function

    pop     ebp

    ; OK, we have sent a packet, so increment the count

    inc     dword [ip_tx_count]

    ; And finally, return the buffer to the free queue

  .freebuf:

    pop     eax

    call    freeBuff

  .exit:

    ret

endp

;***************************************************************************

;   Function

;      ether_IP_handler

;

;   Description

;      Called when an IP ethernet packet is received on the ethernet

;      Header + Data is in Ether_buffer[]

;      We just need to get a buffer from the 'free' queue, and

;      store the packet in it, then insert the packet number into the

;      IPRX queue.

;      If no queue entry is available, the packet is silently discarded

;      All registers may be destroyed

;

;***************************************************************************

ether_IP_handler:

    mov     eax, EMPTY_QUEUE

    call    dequeue

    cmp     ax, NO_BUFFER

    je	    eiph00x

    ; convert buffer pointer eax to the absolute address

    push    eax

    mov     ecx, IPBUFFSIZE

    mul     ecx

    add     eax, IPbuffs

    mov     edi, eax

    ; get a pointer to the start of the DATA

    mov     esi, ETH_FRAME.Data

    ; Now store it all away

    mov     ecx, IPBUFFSIZE / 4     ; Copy all of the available

			      ; data across - worse case

    cld

    rep     movsd

    ; And finally, place the buffer in the IPRX queue

    pop     ebx

    mov     eax, IPIN_QUEUE

    call    queue

eiph00x:

    ret

;***************************************************************************

;   Function

;      eth_probe

;   Description

;      Searches for an ethernet card. If found, the card is enabled and

;      the ethernet -> IP link established

;

;      This function scans the PCI bus looking for a supported device.

;      ISA bus is currently not supported.

;

;        eax is 0 if no hardware found

;***************************************************************************

eth_probe:

    ; Find a card on the PCI bus, and get it's address

    call    scan_bus			; Find the ethernet cards PIC address

    xor     eax, eax

    cmp     [io_addr], eax

    je	    ep_00x			; Return 0 in eax if no cards found

    call    dword [drvr_probe]		; Call the drivers probe function

    mov     eax, [io_addr]		; return a non zero value

ep_00x:

    ret

;***************************************************************************

;   Function

;      ethernet_driver

;

;   Description

;       The ethernet RX and TX handler

;       This is a kernel function, called by stack_handler

;

;***************************************************************************

ethernet_driver:

    ; Do nothing if the driver is inactive

    cmp     [ethernet_active], byte 0

    je	    eth_exit

    call    eth_rx

    call    eth_tx

eth_exit:

    ret

;***************************************************************************

;   Function

;      eth_rx

;

;   Description

;      Polls the ethernet card for received data. Extracts if present

;       Depending on the Protocol within the packet:

;         ARP : Pass to ARP_handler. This may result in an ARP reply

;               being tx'ed

;         IP  : Store in an IP buffer

;

;***************************************************************************

eth_rx:

    xor     ax, ax

    mov     [eth_rx_data_len], ax

    call    dword [drvr_poll]	    ; Call the drivers poll function

    mov     ax, [eth_rx_data_len]

    cmp     ax, 0

    je	    .exit

    ; Check the protocol. Call appropriate handler

    mov     ax, [ETH_FRAME.Type]    ; The address of the protocol word

    cmp     ax, ETHER_IP

    je	    .is_ip		     ; It's IP

    cmp     ax, ETHER_ARP

    je	    .is_arp		     ; It is ARP

    jmp     .exit		; If not IP or ARP, ignore

  .is_ip:

    DEBUGF  1,"K : eth_rx - IP packet\n"

    inc     dword [ip_rx_count]

    call    ether_IP_handler

    jmp     .exit

  .is_arp:

    DEBUGF  1,"K : eth_rx - ARP packet\n"

    ; At this point, the packet is still in the Ether_buffer

    call    arp_handler

  .exit:

    ret