WebSVN – Kolibri OS – Diff – /kernel/trunk/network/eth_drv/arp.inc


 
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;                                                              ;;
;; Copyright (C) KolibriOS team 2004-2007. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License    ;;
;;                                                              ;;
;;  ARP.INC                                                     ;;
;;                                                              ;;
;;  Address Resolution Protocol                                 ;;
;;                                                              ;;
;;  Last revision: 10.11.2006                                   ;;
;;                                                              ;;
;;  This file contains the following:                           ;;
;;   arp_table_manager - Manages an ARPTable                    ;;
;;   arp_request - Sends an ARP request on the ethernet         ;;
;;   arp_handler - Called when an ARP packet is received        ;;
;;                                                              ;;
;;  Changes history:                                            ;;
;;   22.09.2003 - [Mike Hibbett] : mikeh@oceanfree.net          ;;
;;   11.11.2006 - [Johnny_B] and [smb]                          ;;
;;                                                              ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
$Revision: 593 $
 
 
ARP_NO_ENTRY                equ  0
ARP_VALID_MAPPING           equ  1
ARP_AWAITING_RESPONSE       equ  2
ARP_RESPONSE_TIMEOUT        equ  3
 
struc ARP_ENTRY     ;=14 bytes
{  .IP       dd  ?  ;+00
   .MAC      dp  ?  ;+04
   .Status   dw  ?  ;+10
   .TTL      dw  ?  ;+12 : ( in seconds )
}
 
virtual at 0
  ARP_ENTRY ARP_ENTRY
end virtual
 
; The TTL field is decremented every second, and is deleted when it
; reaches 0. It is refreshed every time a packet is received
; If the TTL field is 0xFFFF it is a static entry and is never deleted
; The status field can be the following values:
; 0x0000  entry not used
; 0x0001  entry holds a valid mapping
; 0x0002  entry contains an IP address, awaiting ARP response
; 0x0003  No response received to ARP request.
; The last status value is provided to allow the network layer to delete
; a packet that is queued awaiting an ARP response
 
 
; The follow is the ARP Table.
; This table must be manually updated and the kernel recompilied if
; changes are made to it.
; Empty entries are filled with zeros
 
ARP_ENTRY_SIZE              equ     14          ; Number of bytes per entry
ARP_TABLE_SIZE              equ     20          ; Size of table
ARP_TABLE_ENTRIES           equ     0           ; Number of static entries in the table
 
;TO ADD A STATIC ENTRY, DONT FORGET, PUT "ARPTable" from "uglobal" to "iglobal"!!!
;AND ALSO - IP and MAC have net byte-order, BUT STATUS AND TTL HAVE A MIRROR BYTE-ORDER!!!
uglobal
  ARPTable:
;example, static entry ->  db  11,22,33,44, 0x11,0x22,0x33,0x44,0x55,0x66, 0x01,0x00, 0xFF,0xFF
  times ( ARP_TABLE_SIZE - ARP_TABLE_ENTRIES ) * ARP_ENTRY_SIZE  db 0
endg
 
iglobal
  NumARP:        dd    ARP_TABLE_ENTRIES
  ARPTable_ptr   dd    ARPTable   ;pointer to ARPTable
endg
 
ARP_REQ_OPCODE              equ     0x0100  ;request
ARP_REP_OPCODE              equ     0x0200  ;reply
 
struc ARP_PACKET
{  .HardwareType dw   ?  ;+00
   .ProtocolType dw   ?  ;+02
   .HardwareSize db   ?  ;+04
   .ProtocolSize db   ?  ;+05
   .Opcode       dw   ?  ;+06
   .SenderMAC    dp   ?  ;+08
   .SenderIP     dd   ?  ;+14
   .TargetMAC    dp   ?  ;+18
   .TargetIP     dd   ?  ;+24
}
 
virtual at 0
  ARP_PACKET ARP_PACKET
end virtual
 
 
 
;***************************************************************************
;   Function
;      arp_table_manager  [by Johnny_B]
;
;   Description
;     Does a most required operations with ARP-table
;  IN:
;   Operation: see Opcode's constants below
;       Index: Index of entry in the ARP-table
;       Extra: Extra parameter for some Opcodes
;  OUT:
;   EAX = Returned value depends on opcodes, more detailed see below
;
;***************************************************************************
;Opcode's constants
ARP_TABLE_ADD                 equ  1
ARP_TABLE_DEL                 equ  2
ARP_TABLE_GET                 equ  3
ARP_TABLE_GET_ENTRIES_NUMBER  equ  4
ARP_TABLE_IP_TO_MAC           equ  5
ARP_TABLE_TIMER               equ  6
 
;Index's constants
EXTRA_IS_ARP_PACKET_PTR  equ  0   ;if Extra contain pointer to ARP_PACKET
EXTRA_IS_ARP_ENTRY_PTR   equ  -1  ;if Extra contain pointer to ARP_ENTRY
 
align 4
proc arp_table_manager stdcall uses ebx esi edi ecx edx,\
    Opcode:DWORD,Index:DWORD,Extra:DWORD
 
    mov     ebx, dword[ARPTable_ptr]   ;ARPTable base
    mov     ecx, dword[NumARP]         ;ARP-entries counter
 
    mov     eax, dword[Opcode]
    cmp     eax, ARP_TABLE_TIMER
    je      .timer
    cmp     eax, ARP_TABLE_ADD
    je      .add
    cmp     eax, ARP_TABLE_DEL
    je      .del
    cmp     eax, ARP_TABLE_GET
    je      .get
    cmp     eax, ARP_TABLE_IP_TO_MAC
    je      .ip_to_mac
    cmp     eax, ARP_TABLE_GET_ENTRIES_NUMBER
    je      .get_entries_number
    jmp     .exit     ;if unknown opcode
 
 
;;BEGIN TIMER
;;Description: it must be callback every second. It is responsible for removing expired routes.
;;IN:   Operation: ARP_TABLE_TIMER
;;      Index: must be zero
;;      Extra: must be zero
;;OUT:
;;  EAX=not defined
;;
.timer:
    test    ecx, ecx
    jz      .exit    ;if NumARP=0 nothing to do
    sub     ecx, ARP_TABLE_ENTRIES  ;ecx=dynamic entries number
    jz      .exit    ;if NumARP=number of static entries then exit
 
    add     ebx, ARP_TABLE_ENTRIES*ARP_ENTRY_SIZE  ;ebx=dynamic entries base
 
  .timer_loop:
    movsx   esi, word [ebx + ARP_ENTRY.TTL]
    cmp     esi, 0xFFFFFFFF
    je      .timer_loop_end  ;if TTL==0xFFFF then it's static entry
 
    test    esi, esi
    jnz     .timer_loop_end_with_dec  ;if TTL!=0
 
    ; Ok, TTL is 0
    ;if Status==AWAITING_RESPONSE and TTL==0
    ;then we have to change it to ARP_RESPONSE_TIMEOUT
    cmp     word [ebx + ARP_ENTRY.Status], ARP_AWAITING_RESPONSE
    jne     @f
 
    mov     word [ebx + ARP_ENTRY.Status], ARP_RESPONSE_TIMEOUT
    mov     word [ebx + ARP_ENTRY.TTL], word 0x000A   ;10 sec
    jmp     .timer_loop_end
 
  @@:
    ;if TTL==0 and Status==VALID_MAPPING, we have to delete it
    ;if TTL==0 and Status==RESPONSE_TIMEOUT, delete too
    mov     esi, dword[NumARP]
    sub     esi, ecx          ;esi=index of entry, will be deleted
    stdcall arp_table_manager,ARP_TABLE_DEL,esi,0 ;opcode,index,extra
    jmp     .timer_loop_end
 
 
  .timer_loop_end_with_dec:
    dec     word [ebx + ARP_ENTRY.TTL]  ;decrease TTL
  .timer_loop_end:
    add     ebx, ARP_ENTRY_SIZE
    loop    .timer_loop
 
    jmp     .exit
;;END TIMER
 
;;BEGIN ADD
;;Description: it adds an entry in the table. If ARP-table already
;;             contains same IP, it will be updated.
;;IN:   Operation: ARP_TABLE_ADD
;;      Index: specifies what contains Extra-parameter
;;      Extra: if Index==EXTRA_IS_ARP_PACKET_PTR,
;;             then Extra contains pointer to ARP_PACKET,
;;             otherwise Extra contains pointer to ARP_ENTRY
;;OUT:
;;  EAX=index of entry, that has been added
;;
.add:
 
    sub     esp, ARP_ENTRY_SIZE   ;Allocate ARP_ENTRY_SIZE byte in stack
 
    mov     esi, [Extra]   ;pointer
    mov     edi, [Index]   ;opcode
 
    cmp     edi, EXTRA_IS_ARP_PACKET_PTR
    je      .arp_packet_to_entry ;if Extra contain ptr to ARP_PACKET and we have to form arp-entry
                                 ;else it contain ptr to arp-entry
 
    cld
          ; esi already has been loaded
    mov     edi, esp      ;ebx + eax=ARPTable_base + ARP-entry_base(where we will add)
    mov     ecx,ARP_ENTRY_SIZE/2  ;ARP_ENTRY_SIZE must be even number!!!
    rep     movsw    ;copy
    jmp     .search
 
  .arp_packet_to_entry:
    mov     edx, dword[esi + ARP_PACKET.SenderIP] ;esi=base of ARP_PACKET
    mov     [esp + ARP_ENTRY.IP], edx
 
    cld
    lea     esi, [esi + ARP_PACKET.SenderMAC]
    lea     edi, [esp + ARP_ENTRY.MAC]
    movsd
    movsw
    mov     word[esp + ARP_ENTRY.Status], ARP_VALID_MAPPING  ; specify the type - a valid entry
    mov     word[esp + ARP_ENTRY.TTL], 0x0E10    ; = 1 hour
 
  .search:
    mov     edx, dword[esp + ARP_ENTRY.IP]  ;edx=IP-address, which we'll search
    mov     ecx, dword[NumARP]              ;ecx=ARP-entries counter
    jecxz   .add_to_end                     ;if ARP-entries number == 0
    imul    eax, ecx, ARP_ENTRY_SIZE        ;eax=current table size(in bytes)
  @@:
    sub     eax, ARP_ENTRY_SIZE
    cmp     dword[ebx + eax + ARP_ENTRY.IP], edx
    loopnz  @b
    jz      .replace       ; found, replace existing entry, ptr to it is in eax
 
  .add_to_end:
    ;else add to end
    or      eax,-1    ;set eax=0xFFFFFFFF if adding is impossible
    mov     ecx, dword[NumARP]
    cmp     ecx, ARP_TABLE_SIZE
    je      .add_exit   ;if arp-entries number is equal to arp-table maxsize
 
    imul    eax, dword[NumARP], ARP_ENTRY_SIZE ;eax=ptr to end of ARPTable
    inc     dword [NumARP]    ;increase ARP-entries counter
 
  .replace:
    cld
    mov     esi, esp              ;esp=base of ARP-entry, that will be added
    lea     edi, [ebx + eax]      ;ebx + eax=ARPTable_base + ARP-entry_base(where we will add)
    mov     ecx,ARP_ENTRY_SIZE/2  ;ARP_ENTRY_SIZE must be even number!!!
    rep     movsw
 
    mov     ecx, ARP_ENTRY_SIZE
    xor     edx, edx  ;"div" takes operand from EDX:EAX
    div     ecx       ;eax=index of entry, which has been added
 
.add_exit:
    add     esp, ARP_ENTRY_SIZE   ;free stack
    jmp     .exit
;;END ADD
 
;;BEGIN DEL
;;Description: it deletes an entry in the table.
;;IN:   Operation: ARP_TABLE_DEL
;;      Index: index of entry, that should be deleted
;;      Extra: must be zero
;;OUT:
;;  EAX=not defined
;;
.del:
    mov     esi, [Index]
    imul    esi, ARP_ENTRY_SIZE
 
    mov     ecx, (ARP_TABLE_SIZE - 1) * ARP_ENTRY_SIZE
    sub     ecx, esi
 
    lea     edi, [ebx + esi]            ;edi=ptr to entry that should be deleted
    lea     esi, [edi + ARP_ENTRY_SIZE] ;esi=ptr to next entry
 
    shr     ecx,1      ;ecx/2 => ARP_ENTRY_SIZE MUST BE EVEN NUMBER!
    cld
    rep     movsw
 
    dec     dword[NumARP] ;decrease arp-entries counter
    jmp     .exit
;;END DEL
 
;;BEGIN GET
;;Description: it reads an entry of table into buffer.
;;IN:   Operation: ARP_TABLE_GET
;;      Index: index of entry, that should be read
;;      Extra: pointer to buffer for reading(size must be equal to ARP_ENTRY_SIZE)
;;OUT:
;;  EAX=not defined
;;
.get:
    mov     esi, [Index]
    imul    esi, ARP_ENTRY_SIZE   ;esi=ptr to required ARP_ENTRY
    mov     edi, [Extra]          ;edi=buffer for reading
    mov     ecx, ARP_ENTRY_SIZE/2 ; must be even number!!!
    cld
    rep     movsw
    jmp     .exit
;;END GET
 
;;BEGIN IP_TO_MAC
;;Description: it gets an IP from Index, scans each entry in the table and writes
;;             MAC, that relates to specified IP, into buffer specified in Extra.
;;             And if it cannot find an IP-address in the table, it does an ARP-request of that.
;;IN:   Operation: ARP_TABLE_IP_TO_MAC
;;      Index: IP that should be transformed into MAC
;;      Extra: pointer to buffer where will be written the MAC-address.
;;OUT:
;;  EAX=ARP table entry status code.
;;      If EAX==ARP_NO_ENTRY, IP isn't found in the table and we have sent the request.
;;      If EAX==ARP_AWAITING_RESPONSE, we wait the response from remote system.
;;      If EAX==ARP_RESPONSE_TIMEOUT, remote system not responds too long.
;;      If EAX==ARP_VALID_MAPPING, all is ok, we've got a true MAC.
;;
;;  If MAC will equal to a zero, in the buffer. It means, that IP-address was not yet
;;  resolved, or that doesn't exist. I recommend you, to do at most 3-5 calls of this
;;  function with 1sec delay. sure, only if it not return a valid MAC after a first call.
;;  
.ip_to_mac:
 
    xor     eax, eax
    mov     edi, dword[Extra]
    cld
    stosd
    stosw
 
    cmp     dword[NumARP], 0
    je      .ip_to_mac_send_request ;if ARP-table not contain an entries, we have to request IP.
                                    ;EAX will be containing a zero, it's equal to ARP_NO_ENTRY
 
    mov     eax, [Index]       ;eax=required IP
    mov     ecx, dword[NumARP]
    imul    esi, ecx, ARP_ENTRY_SIZE  ;esi=current ARP-table size
 
  @@:
    sub     esi, ARP_ENTRY_SIZE
    cmp     [ebx + esi], eax         ; ebx=ARPTable base
    loopnz  @b                       ; Return back if non match
    jnz     .ip_to_mac_send_request  ; and request IP->MAC if none found in the table
 
    ; Return the entry status in eax
    movzx   eax, word[ebx + esi + ARP_ENTRY.Status]
 
    ; esi holds index
    cld
    lea     esi, [ebx + esi + ARP_ENTRY.MAC]
    mov     edi, [Extra]   ;edi=ptr to buffer for write MAC
    movsd
    movsw
    jmp     .exit
 
  .ip_to_mac_send_request:
    stdcall arp_request,[Index],stack_ip,node_addr  ;TargetIP,SenderIP_ptr,SenderMAC_ptr
    mov     eax, ARP_NO_ENTRY
    jmp     .exit
 
;;END IP_TO_MAC
 
;;BEGIN GET_ENTRIES_NUMBER
;;Description: returns an ARP-entries number in the ARPTable
;;IN:   Operation: ARP_TABLE_GET_ENTRIES_NUMBER
;;      Index: must be zero
;;      Extra: must be zero
;;OUT:
;;  EAX=ARP-entries number in the ARPTable
  .get_entries_number:
    mov     eax, dword[NumARP]
    jmp     .exit
;;END GET_ENTRIES_NUMBER
 
.exit:
    ret
endp
 
 
;***************************************************************************
;   Function
;      arp_handler
;
;   Description
;      Called when an ARP packet is received on the ethernet
;      Header + Data is in Ether_buffer[]
;       It looks to see if the packet is a request to resolve this Hosts
;       IP address. If it is, send the ARP reply packet.
;      This Hosts IP address is in dword [stack_ip]  ( in network format )
;       This Hosts MAC address is in node_addr[6]
;      All registers may be destroyed
;
;***************************************************************************
arp_handler:
    ; Is this a REQUEST?
    ; Is this a request for My Host IP
    ; Yes - So construct a response message.
    ; Send this message to the ethernet card for transmission
 
    stdcall arp_table_manager,ARP_TABLE_ADD,EXTRA_IS_ARP_PACKET_PTR,ETH_FRAME.Data + ARP_PACKET
 
    inc     dword[arp_rx_count] ;increase ARP-packets counter
 
    cmp     word[ETH_FRAME.Data + ARP_PACKET.Opcode], ARP_REQ_OPCODE  ; Is this a request packet?
    jne     .exit            ; No - so exit
 
    mov     eax, [stack_ip] 
    cmp     eax, dword[ETH_FRAME.Data + ARP_PACKET.TargetIP]         ; Is it looking for my IP address?
    jne     .exit            ; No - so quit now
 
    ; OK, it is a request for my MAC address. Build the frame and send it
    ; We can reuse the packet.
 
    mov     word[ETH_FRAME.Data + ARP_PACKET.Opcode], ARP_REP_OPCODE
 
    cld
    mov     esi, ETH_FRAME.Data + ARP_PACKET.SenderMAC
    mov     edi, ETH_FRAME.Data + ARP_PACKET.TargetMAC
    movsd
    movsw
 
    mov     esi, ETH_FRAME.Data + ARP_PACKET.SenderIP
    mov     edi, ETH_FRAME.Data + ARP_PACKET.TargetIP
    movsd
 
    mov     esi, node_addr
    mov     edi, ETH_FRAME.Data + ARP_PACKET.SenderMAC
    movsd
    movsw
 
    mov     esi, stack_ip
    mov     edi, ETH_FRAME.Data + ARP_PACKET.SenderIP
    movsd
 
    ; Now, send it!
    mov     edi, ETH_FRAME.Data + ARP_PACKET.TargetMAC   ;ptr to destination MAC address
    mov     bx, ETHER_ARP               ;type of protocol
    mov     ecx, 28                     ;data size
    mov     esi, ETH_FRAME.Data + ARP_PACKET             ;ptr to data
    call    dword [drvr_transmit]       ;transmit packet
 
  .exit:
    ret
 
 
;***************************************************************************
;   Function
;      arp_request  [by Johnny_B]
;
;   Description
;      Sends an ARP request on the ethernet
;   IN:
;     TargetIP      : requested IP address
;     SenderIP_ptr  : POINTER to sender's IP address(our system's address)
;     SenderMAC_ptr : POINTER to sender's MAC address(our system's address)
;   OUT:
;     EAX=0 (if all is ok), otherwise EAX is not defined
;
;      EBX,ESI,EDI will be saved
;
;***************************************************************************
proc arp_request stdcall uses ebx esi edi,\
    TargetIP:DWORD, SenderIP_ptr:DWORD, SenderMAC_ptr:DWORD
 
    inc     dword[arp_tx_count]  ; increase counter
 
    sub     esp, 28  ; allocate memory for ARP_PACKET
 
    mov     word[esp + ARP_PACKET.HardwareType],0x0100 ;Ethernet
    mov     word[esp + ARP_PACKET.ProtocolType],0x0008 ;IP
    mov     byte[esp + ARP_PACKET.HardwareSize],0x06   ;MAC-addr length
    mov     byte[esp + ARP_PACKET.ProtocolSize],0x04   ;IP-addr length
    mov     word[esp + ARP_PACKET.Opcode],0x0100       ;Request
 
    cld
    mov     esi,[SenderMAC_ptr]
    lea     edi,[esp + ARP_PACKET.SenderMAC]       ;Our MAC-addr
    movsd
    movsw
 
    mov     esi,[SenderIP_ptr]
    lea     edi,[esp + ARP_PACKET.SenderIP]        ;Our IP-addr
    movsd
 
    xor     eax, eax
    lea     edi, [esp + ARP_PACKET.TargetMAC]      ;Required MAC-addr(zeroed)
    stosd
    stosw
 
    mov     esi, dword[TargetIP]
    mov     dword[esp + ARP_PACKET.TargetIP],esi   ;Required IP-addr(we get it as function parameter)
 
    ; Now, send it!
    mov     edi, broadcast_add     ; Pointer to 48 bit destination address
    mov     bx, ETHER_ARP          ; Type of packet
    mov     ecx, 28                ; size of packet
    lea     esi, [esp + ARP_PACKET]; pointer to packet data
    call    dword [drvr_transmit]  ; Call the drivers transmit function
 
    add     esp, 28  ; free memory, allocated before for ARP_PACKET
 
    ; Add an entry in the ARP table, awaiting response
    sub     esp, ARP_ENTRY_SIZE    ;allocate memory for ARP-entry
 
    mov     esi, dword[TargetIP]
    mov     dword[esp + ARP_ENTRY.IP],esi
 
    lea     edi, [esp + ARP_ENTRY.MAC]
    xor     eax, eax
    stosd
    stosw
 
    mov     word[esp + ARP_ENTRY.Status], ARP_AWAITING_RESPONSE
    mov     word[esp + ARP_ENTRY.TTL], 0x000A  ; 10 seconds
 
    stdcall arp_table_manager,ARP_TABLE_ADD,EXTRA_IS_ARP_ENTRY_PTR,esp
    add     esp, ARP_ENTRY_SIZE  ; free memory
 
.exit:
    ret
endp

Rev 511	Rev 593
1	$Revision: 511 $	-
2	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;	1	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
3	;; ;;	2	;; ;;
4	;; Copyright (C) KolibriOS team 2004-2007. All rights reserved. ;;	3	;; Copyright (C) KolibriOS team 2004-2007. All rights reserved. ;;
5	;; Distributed under terms of the GNU General Public License ;;	4	;; Distributed under terms of the GNU General Public License ;;
6	;; ;;	5	;; ;;
7	;; ARP.INC ;;	6	;; ARP.INC ;;
8	;; ;;	7	;; ;;
9	;; Address Resolution Protocol ;;	8	;; Address Resolution Protocol ;;
10	;; ;;	9	;; ;;
11	;; Last revision: 10.11.2006 ;;	10	;; Last revision: 10.11.2006 ;;
12	;; ;;	11	;; ;;
13	;; This file contains the following: ;;	12	;; This file contains the following: ;;
14	;; arp_table_manager - Manages an ARPTable ;;	13	;; arp_table_manager - Manages an ARPTable ;;
15	;; arp_request - Sends an ARP request on the ethernet ;;	14	;; arp_request - Sends an ARP request on the ethernet ;;
16	;; arp_handler - Called when an ARP packet is received ;;	15	;; arp_handler - Called when an ARP packet is received ;;
17	;; ;;	16	;; ;;
18	;; Changes history: ;;	17	;; Changes history: ;;
19	;; 22.09.2003 - [Mike Hibbett] : mikeh@oceanfree.net ;;	18	;; 22.09.2003 - [Mike Hibbett] : mikeh@oceanfree.net ;;
20	;; 11.11.2006 - [Johnny_B] and [smb] ;;	19	;; 11.11.2006 - [Johnny_B] and [smb] ;;
21	;; ;;	20	;; ;;
22	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;	21	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-		22
-		23	$Revision: 593 $
-		24
23		25
24	ARP_NO_ENTRY equ 0	26	ARP_NO_ENTRY equ 0
25	ARP_VALID_MAPPING equ 1	27	ARP_VALID_MAPPING equ 1
26	ARP_AWAITING_RESPONSE equ 2	28	ARP_AWAITING_RESPONSE equ 2
27	ARP_RESPONSE_TIMEOUT equ 3	29	ARP_RESPONSE_TIMEOUT equ 3
28		30
29	struc ARP_ENTRY ;=14 bytes	31	struc ARP_ENTRY ;=14 bytes
30	{ .IP dd ? ;+00	32	{ .IP dd ? ;+00
31	.MAC dp ? ;+04	33	.MAC dp ? ;+04
32	.Status dw ? ;+10	34	.Status dw ? ;+10
33	.TTL dw ? ;+12 : ( in seconds )	35	.TTL dw ? ;+12 : ( in seconds )
34	}	36	}
35		37
36	virtual at 0	38	virtual at 0
37	ARP_ENTRY ARP_ENTRY	39	ARP_ENTRY ARP_ENTRY
38	end virtual	40	end virtual
39		41
40	; The TTL field is decremented every second, and is deleted when it	42	; The TTL field is decremented every second, and is deleted when it
41	; reaches 0. It is refreshed every time a packet is received	43	; reaches 0. It is refreshed every time a packet is received
42	; If the TTL field is 0xFFFF it is a static entry and is never deleted	44	; If the TTL field is 0xFFFF it is a static entry and is never deleted
43	; The status field can be the following values:	45	; The status field can be the following values:
44	; 0x0000 entry not used	46	; 0x0000 entry not used
45	; 0x0001 entry holds a valid mapping	47	; 0x0001 entry holds a valid mapping
46	; 0x0002 entry contains an IP address, awaiting ARP response	48	; 0x0002 entry contains an IP address, awaiting ARP response
47	; 0x0003 No response received to ARP request.	49	; 0x0003 No response received to ARP request.
48	; The last status value is provided to allow the network layer to delete	50	; The last status value is provided to allow the network layer to delete
49	; a packet that is queued awaiting an ARP response	51	; a packet that is queued awaiting an ARP response
50		52
51		53
52	; The follow is the ARP Table.	54	; The follow is the ARP Table.
53	; This table must be manually updated and the kernel recompilied if	55	; This table must be manually updated and the kernel recompilied if
54	; changes are made to it.	56	; changes are made to it.
55	; Empty entries are filled with zeros	57	; Empty entries are filled with zeros
56		58
57	ARP_ENTRY_SIZE equ 14 ; Number of bytes per entry	59	ARP_ENTRY_SIZE equ 14 ; Number of bytes per entry
58	ARP_TABLE_SIZE equ 20 ; Size of table	60	ARP_TABLE_SIZE equ 20 ; Size of table
59	ARP_TABLE_ENTRIES equ 0 ; Number of static entries in the table	61	ARP_TABLE_ENTRIES equ 0 ; Number of static entries in the table
60		62
61	;TO ADD A STATIC ENTRY, DONT FORGET, PUT "ARPTable" from "uglobal" to "iglobal"!!!	63	;TO ADD A STATIC ENTRY, DONT FORGET, PUT "ARPTable" from "uglobal" to "iglobal"!!!
62	;AND ALSO - IP and MAC have net byte-order, BUT STATUS AND TTL HAVE A MIRROR BYTE-ORDER!!!	64	;AND ALSO - IP and MAC have net byte-order, BUT STATUS AND TTL HAVE A MIRROR BYTE-ORDER!!!
63	uglobal	65	uglobal
64	ARPTable:	66	ARPTable:
65	;example, static entry -> db 11,22,33,44, 0x11,0x22,0x33,0x44,0x55,0x66, 0x01,0x00, 0xFF,0xFF	67	;example, static entry -> db 11,22,33,44, 0x11,0x22,0x33,0x44,0x55,0x66, 0x01,0x00, 0xFF,0xFF
66	times ( ARP_TABLE_SIZE - ARP_TABLE_ENTRIES ) * ARP_ENTRY_SIZE db 0	68	times ( ARP_TABLE_SIZE - ARP_TABLE_ENTRIES ) * ARP_ENTRY_SIZE db 0
67	endg	69	endg
68		70
69	iglobal	71	iglobal
70	NumARP: dd ARP_TABLE_ENTRIES	72	NumARP: dd ARP_TABLE_ENTRIES
71	ARPTable_ptr dd ARPTable ;pointer to ARPTable	73	ARPTable_ptr dd ARPTable ;pointer to ARPTable
72	endg	74	endg
73		75
74	ARP_REQ_OPCODE equ 0x0100 ;request	76	ARP_REQ_OPCODE equ 0x0100 ;request
75	ARP_REP_OPCODE equ 0x0200 ;reply	77	ARP_REP_OPCODE equ 0x0200 ;reply
76		78
77	struc ARP_PACKET	79	struc ARP_PACKET
78	{ .HardwareType dw ? ;+00	80	{ .HardwareType dw ? ;+00
79	.ProtocolType dw ? ;+02	81	.ProtocolType dw ? ;+02
80	.HardwareSize db ? ;+04	82	.HardwareSize db ? ;+04
81	.ProtocolSize db ? ;+05	83	.ProtocolSize db ? ;+05
82	.Opcode dw ? ;+06	84	.Opcode dw ? ;+06
83	.SenderMAC dp ? ;+08	85	.SenderMAC dp ? ;+08
84	.SenderIP dd ? ;+14	86	.SenderIP dd ? ;+14
85	.TargetMAC dp ? ;+18	87	.TargetMAC dp ? ;+18
86	.TargetIP dd ? ;+24	88	.TargetIP dd ? ;+24
87	}	89	}
88		90
89	virtual at 0	91	virtual at 0
90	ARP_PACKET ARP_PACKET	92	ARP_PACKET ARP_PACKET
91	end virtual	93	end virtual
92		94
93		95
94		96
95	;***************************************************************************	97	;***************************************************************************
96	; Function	98	; Function
97	; arp_table_manager [by Johnny_B]	99	; arp_table_manager [by Johnny_B]
98	;	100	;
99	; Description	101	; Description
100	; Does a most required operations with ARP-table	102	; Does a most required operations with ARP-table
101	; IN:	103	; IN:
102	; Operation: see Opcode's constants below	104	; Operation: see Opcode's constants below
103	; Index: Index of entry in the ARP-table	105	; Index: Index of entry in the ARP-table
104	; Extra: Extra parameter for some Opcodes	106	; Extra: Extra parameter for some Opcodes
105	; OUT:	107	; OUT:
106	; EAX = Returned value depends on opcodes, more detailed see below	108	; EAX = Returned value depends on opcodes, more detailed see below
107	;	109	;
108	;***************************************************************************	110	;***************************************************************************
109	;Opcode's constants	111	;Opcode's constants
110	ARP_TABLE_ADD equ 1	112	ARP_TABLE_ADD equ 1
111	ARP_TABLE_DEL equ 2	113	ARP_TABLE_DEL equ 2
112	ARP_TABLE_GET equ 3	114	ARP_TABLE_GET equ 3
113	ARP_TABLE_GET_ENTRIES_NUMBER equ 4	115	ARP_TABLE_GET_ENTRIES_NUMBER equ 4
114	ARP_TABLE_IP_TO_MAC equ 5	116	ARP_TABLE_IP_TO_MAC equ 5
115	ARP_TABLE_TIMER equ 6	117	ARP_TABLE_TIMER equ 6
116		118
117	;Index's constants	119	;Index's constants
118	EXTRA_IS_ARP_PACKET_PTR equ 0 ;if Extra contain pointer to ARP_PACKET	120	EXTRA_IS_ARP_PACKET_PTR equ 0 ;if Extra contain pointer to ARP_PACKET
119	EXTRA_IS_ARP_ENTRY_PTR equ -1 ;if Extra contain pointer to ARP_ENTRY	121	EXTRA_IS_ARP_ENTRY_PTR equ -1 ;if Extra contain pointer to ARP_ENTRY
120		122
121	align 4	123	align 4
122	proc arp_table_manager stdcall uses ebx esi edi ecx edx,\	124	proc arp_table_manager stdcall uses ebx esi edi ecx edx,\
123	Opcode:DWORD,Index:DWORD,Extra:DWORD	125	Opcode:DWORD,Index:DWORD,Extra:DWORD
124		126
125	mov ebx, dword[ARPTable_ptr] ;ARPTable base	127	mov ebx, dword[ARPTable_ptr] ;ARPTable base
126	mov ecx, dword[NumARP] ;ARP-entries counter	128	mov ecx, dword[NumARP] ;ARP-entries counter
127		129
128	mov eax, dword[Opcode]	130	mov eax, dword[Opcode]
129	cmp eax, ARP_TABLE_TIMER	131	cmp eax, ARP_TABLE_TIMER
130	je .timer	132	je .timer
131	cmp eax, ARP_TABLE_ADD	133	cmp eax, ARP_TABLE_ADD
132	je .add	134	je .add
133	cmp eax, ARP_TABLE_DEL	135	cmp eax, ARP_TABLE_DEL
134	je .del	136	je .del
135	cmp eax, ARP_TABLE_GET	137	cmp eax, ARP_TABLE_GET
136	je .get	138	je .get
137	cmp eax, ARP_TABLE_IP_TO_MAC	139	cmp eax, ARP_TABLE_IP_TO_MAC
138	je .ip_to_mac	140	je .ip_to_mac
139	cmp eax, ARP_TABLE_GET_ENTRIES_NUMBER	141	cmp eax, ARP_TABLE_GET_ENTRIES_NUMBER
140	je .get_entries_number	142	je .get_entries_number
141	jmp .exit ;if unknown opcode	143	jmp .exit ;if unknown opcode
142		144
143		145
144	;;BEGIN TIMER	146	;;BEGIN TIMER
145	;;Description: it must be callback every second. It is responsible for removing expired routes.	147	;;Description: it must be callback every second. It is responsible for removing expired routes.
146	;;IN: Operation: ARP_TABLE_TIMER	148	;;IN: Operation: ARP_TABLE_TIMER
147	;; Index: must be zero	149	;; Index: must be zero
148	;; Extra: must be zero	150	;; Extra: must be zero
149	;;OUT:	151	;;OUT:
150	;; EAX=not defined	152	;; EAX=not defined
151	;;	153	;;
152	.timer:	154	.timer:
153	test ecx, ecx	155	test ecx, ecx
154	jz .exit ;if NumARP=0 nothing to do	156	jz .exit ;if NumARP=0 nothing to do
155	sub ecx, ARP_TABLE_ENTRIES ;ecx=dynamic entries number	157	sub ecx, ARP_TABLE_ENTRIES ;ecx=dynamic entries number
156	jz .exit ;if NumARP=number of static entries then exit	158	jz .exit ;if NumARP=number of static entries then exit
157		159
158	add ebx, ARP_TABLE_ENTRIES*ARP_ENTRY_SIZE ;ebx=dynamic entries base	160	add ebx, ARP_TABLE_ENTRIES*ARP_ENTRY_SIZE ;ebx=dynamic entries base
159		161
160	.timer_loop:	162	.timer_loop:
161	movsx esi, word [ebx + ARP_ENTRY.TTL]	163	movsx esi, word [ebx + ARP_ENTRY.TTL]
162	cmp esi, 0xFFFFFFFF	164	cmp esi, 0xFFFFFFFF
163	je .timer_loop_end ;if TTL==0xFFFF then it's static entry	165	je .timer_loop_end ;if TTL==0xFFFF then it's static entry
164		166
165	test esi, esi	167	test esi, esi
166	jnz .timer_loop_end_with_dec ;if TTL!=0	168	jnz .timer_loop_end_with_dec ;if TTL!=0
167		169
168	; Ok, TTL is 0	170	; Ok, TTL is 0
169	;if Status==AWAITING_RESPONSE and TTL==0	171	;if Status==AWAITING_RESPONSE and TTL==0
170	;then we have to change it to ARP_RESPONSE_TIMEOUT	172	;then we have to change it to ARP_RESPONSE_TIMEOUT
171	cmp word [ebx + ARP_ENTRY.Status], ARP_AWAITING_RESPONSE	173	cmp word [ebx + ARP_ENTRY.Status], ARP_AWAITING_RESPONSE
172	jne @f	174	jne @f
173		175
174	mov word [ebx + ARP_ENTRY.Status], ARP_RESPONSE_TIMEOUT	176	mov word [ebx + ARP_ENTRY.Status], ARP_RESPONSE_TIMEOUT
175	mov word [ebx + ARP_ENTRY.TTL], word 0x000A ;10 sec	177	mov word [ebx + ARP_ENTRY.TTL], word 0x000A ;10 sec
176	jmp .timer_loop_end	178	jmp .timer_loop_end
177		179
178	@@:	180	@@:
179	;if TTL==0 and Status==VALID_MAPPING, we have to delete it	181	;if TTL==0 and Status==VALID_MAPPING, we have to delete it
180	;if TTL==0 and Status==RESPONSE_TIMEOUT, delete too	182	;if TTL==0 and Status==RESPONSE_TIMEOUT, delete too
181	mov esi, dword[NumARP]	183	mov esi, dword[NumARP]
182	sub esi, ecx ;esi=index of entry, will be deleted	184	sub esi, ecx ;esi=index of entry, will be deleted
183	stdcall arp_table_manager,ARP_TABLE_DEL,esi,0 ;opcode,index,extra	185	stdcall arp_table_manager,ARP_TABLE_DEL,esi,0 ;opcode,index,extra
184	jmp .timer_loop_end	186	jmp .timer_loop_end
185		187
186		188
187	.timer_loop_end_with_dec:	189	.timer_loop_end_with_dec:
188	dec word [ebx + ARP_ENTRY.TTL] ;decrease TTL	190	dec word [ebx + ARP_ENTRY.TTL] ;decrease TTL
189	.timer_loop_end:	191	.timer_loop_end:
190	add ebx, ARP_ENTRY_SIZE	192	add ebx, ARP_ENTRY_SIZE
191	loop .timer_loop	193	loop .timer_loop
192		194
193	jmp .exit	195	jmp .exit
194	;;END TIMER	196	;;END TIMER
195		197
196	;;BEGIN ADD	198	;;BEGIN ADD
197	;;Description: it adds an entry in the table. If ARP-table already	199	;;Description: it adds an entry in the table. If ARP-table already
198	;; contains same IP, it will be updated.	200	;; contains same IP, it will be updated.
199	;;IN: Operation: ARP_TABLE_ADD	201	;;IN: Operation: ARP_TABLE_ADD
200	;; Index: specifies what contains Extra-parameter	202	;; Index: specifies what contains Extra-parameter
201	;; Extra: if Index==EXTRA_IS_ARP_PACKET_PTR,	203	;; Extra: if Index==EXTRA_IS_ARP_PACKET_PTR,
202	;; then Extra contains pointer to ARP_PACKET,	204	;; then Extra contains pointer to ARP_PACKET,
203	;; otherwise Extra contains pointer to ARP_ENTRY	205	;; otherwise Extra contains pointer to ARP_ENTRY
204	;;OUT:	206	;;OUT:
205	;; EAX=index of entry, that has been added	207	;; EAX=index of entry, that has been added
206	;;	208	;;
207	.add:	209	.add:
208		210
209	sub esp, ARP_ENTRY_SIZE ;Allocate ARP_ENTRY_SIZE byte in stack	211	sub esp, ARP_ENTRY_SIZE ;Allocate ARP_ENTRY_SIZE byte in stack
210		212
211	mov esi, [Extra] ;pointer	213	mov esi, [Extra] ;pointer
212	mov edi, [Index] ;opcode	214	mov edi, [Index] ;opcode
213		215
214	cmp edi, EXTRA_IS_ARP_PACKET_PTR	216	cmp edi, EXTRA_IS_ARP_PACKET_PTR
215	je .arp_packet_to_entry ;if Extra contain ptr to ARP_PACKET and we have to form arp-entry	217	je .arp_packet_to_entry ;if Extra contain ptr to ARP_PACKET and we have to form arp-entry
216	;else it contain ptr to arp-entry	218	;else it contain ptr to arp-entry
217		219
218	cld	220	cld
219	; esi already has been loaded	221	; esi already has been loaded
220	mov edi, esp ;ebx + eax=ARPTable_base + ARP-entry_base(where we will add)	222	mov edi, esp ;ebx + eax=ARPTable_base + ARP-entry_base(where we will add)
221	mov ecx,ARP_ENTRY_SIZE/2 ;ARP_ENTRY_SIZE must be even number!!!	223	mov ecx,ARP_ENTRY_SIZE/2 ;ARP_ENTRY_SIZE must be even number!!!
222	rep movsw ;copy	224	rep movsw ;copy
223	jmp .search	225	jmp .search
224		226
225	.arp_packet_to_entry:	227	.arp_packet_to_entry:
226	mov edx, dword[esi + ARP_PACKET.SenderIP] ;esi=base of ARP_PACKET	228	mov edx, dword[esi + ARP_PACKET.SenderIP] ;esi=base of ARP_PACKET
227	mov [esp + ARP_ENTRY.IP], edx	229	mov [esp + ARP_ENTRY.IP], edx
228		230
229	cld	231	cld
230	lea esi, [esi + ARP_PACKET.SenderMAC]	232	lea esi, [esi + ARP_PACKET.SenderMAC]
231	lea edi, [esp + ARP_ENTRY.MAC]	233	lea edi, [esp + ARP_ENTRY.MAC]
232	movsd	234	movsd
233	movsw	235	movsw
234	mov word[esp + ARP_ENTRY.Status], ARP_VALID_MAPPING ; specify the type - a valid entry	236	mov word[esp + ARP_ENTRY.Status], ARP_VALID_MAPPING ; specify the type - a valid entry
235	mov word[esp + ARP_ENTRY.TTL], 0x0E10 ; = 1 hour	237	mov word[esp + ARP_ENTRY.TTL], 0x0E10 ; = 1 hour
236		238
237	.search:	239	.search:
238	mov edx, dword[esp + ARP_ENTRY.IP] ;edx=IP-address, which we'll search	240	mov edx, dword[esp + ARP_ENTRY.IP] ;edx=IP-address, which we'll search
239	mov ecx, dword[NumARP] ;ecx=ARP-entries counter	241	mov ecx, dword[NumARP] ;ecx=ARP-entries counter
240	jecxz .add_to_end ;if ARP-entries number == 0	242	jecxz .add_to_end ;if ARP-entries number == 0
241	imul eax, ecx, ARP_ENTRY_SIZE ;eax=current table size(in bytes)	243	imul eax, ecx, ARP_ENTRY_SIZE ;eax=current table size(in bytes)
242	@@:	244	@@:
243	sub eax, ARP_ENTRY_SIZE	245	sub eax, ARP_ENTRY_SIZE
244	cmp dword[ebx + eax + ARP_ENTRY.IP], edx	246	cmp dword[ebx + eax + ARP_ENTRY.IP], edx
245	loopnz @b	247	loopnz @b
246	jz .replace ; found, replace existing entry, ptr to it is in eax	248	jz .replace ; found, replace existing entry, ptr to it is in eax
247		249
248	.add_to_end:	250	.add_to_end:
249	;else add to end	251	;else add to end
250	or eax,-1 ;set eax=0xFFFFFFFF if adding is impossible	252	or eax,-1 ;set eax=0xFFFFFFFF if adding is impossible
251	mov ecx, dword[NumARP]	253	mov ecx, dword[NumARP]
252	cmp ecx, ARP_TABLE_SIZE	254	cmp ecx, ARP_TABLE_SIZE
253	je .add_exit ;if arp-entries number is equal to arp-table maxsize	255	je .add_exit ;if arp-entries number is equal to arp-table maxsize
254		256
255	imul eax, dword[NumARP], ARP_ENTRY_SIZE ;eax=ptr to end of ARPTable	257	imul eax, dword[NumARP], ARP_ENTRY_SIZE ;eax=ptr to end of ARPTable
256	inc dword [NumARP] ;increase ARP-entries counter	258	inc dword [NumARP] ;increase ARP-entries counter
257		259
258	.replace:	260	.replace:
259	cld	261	cld
260	mov esi, esp ;esp=base of ARP-entry, that will be added	262	mov esi, esp ;esp=base of ARP-entry, that will be added
261	lea edi, [ebx + eax] ;ebx + eax=ARPTable_base + ARP-entry_base(where we will add)	263	lea edi, [ebx + eax] ;ebx + eax=ARPTable_base + ARP-entry_base(where we will add)
262	mov ecx,ARP_ENTRY_SIZE/2 ;ARP_ENTRY_SIZE must be even number!!!	264	mov ecx,ARP_ENTRY_SIZE/2 ;ARP_ENTRY_SIZE must be even number!!!
263	rep movsw	265	rep movsw
264		266
265	mov ecx, ARP_ENTRY_SIZE	267	mov ecx, ARP_ENTRY_SIZE
266	xor edx, edx ;"div" takes operand from EDX:EAX	268	xor edx, edx ;"div" takes operand from EDX:EAX
267	div ecx ;eax=index of entry, which has been added	269	div ecx ;eax=index of entry, which has been added
268		270
269	.add_exit:	271	.add_exit:
270	add esp, ARP_ENTRY_SIZE ;free stack	272	add esp, ARP_ENTRY_SIZE ;free stack
271	jmp .exit	273	jmp .exit
272	;;END ADD	274	;;END ADD
273		275
274	;;BEGIN DEL	276	;;BEGIN DEL
275	;;Description: it deletes an entry in the table.	277	;;Description: it deletes an entry in the table.
276	;;IN: Operation: ARP_TABLE_DEL	278	;;IN: Operation: ARP_TABLE_DEL
277	;; Index: index of entry, that should be deleted	279	;; Index: index of entry, that should be deleted
278	;; Extra: must be zero	280	;; Extra: must be zero
279	;;OUT:	281	;;OUT:
280	;; EAX=not defined	282	;; EAX=not defined
281	;;	283	;;
282	.del:	284	.del:
283	mov esi, [Index]	285	mov esi, [Index]
284	imul esi, ARP_ENTRY_SIZE	286	imul esi, ARP_ENTRY_SIZE
285		287
286	mov ecx, (ARP_TABLE_SIZE - 1) * ARP_ENTRY_SIZE	288	mov ecx, (ARP_TABLE_SIZE - 1) * ARP_ENTRY_SIZE
287	sub ecx, esi	289	sub ecx, esi
288		290
289	lea edi, [ebx + esi] ;edi=ptr to entry that should be deleted	291	lea edi, [ebx + esi] ;edi=ptr to entry that should be deleted
290	lea esi, [edi + ARP_ENTRY_SIZE] ;esi=ptr to next entry	292	lea esi, [edi + ARP_ENTRY_SIZE] ;esi=ptr to next entry
291		293
292	shr ecx,1 ;ecx/2 => ARP_ENTRY_SIZE MUST BE EVEN NUMBER!	294	shr ecx,1 ;ecx/2 => ARP_ENTRY_SIZE MUST BE EVEN NUMBER!
293	cld	295	cld
294	rep movsw	296	rep movsw
295		297
296	dec dword[NumARP] ;decrease arp-entries counter	298	dec dword[NumARP] ;decrease arp-entries counter
297	jmp .exit	299	jmp .exit
298	;;END DEL	300	;;END DEL
299		301
300	;;BEGIN GET	302	;;BEGIN GET
301	;;Description: it reads an entry of table into buffer.	303	;;Description: it reads an entry of table into buffer.
302	;;IN: Operation: ARP_TABLE_GET	304	;;IN: Operation: ARP_TABLE_GET
303	;; Index: index of entry, that should be read	305	;; Index: index of entry, that should be read
304	;; Extra: pointer to buffer for reading(size must be equal to ARP_ENTRY_SIZE)	306	;; Extra: pointer to buffer for reading(size must be equal to ARP_ENTRY_SIZE)
305	;;OUT:	307	;;OUT:
306	;; EAX=not defined	308	;; EAX=not defined
307	;;	309	;;
308	.get:	310	.get:
309	mov esi, [Index]	311	mov esi, [Index]
310	imul esi, ARP_ENTRY_SIZE ;esi=ptr to required ARP_ENTRY	312	imul esi, ARP_ENTRY_SIZE ;esi=ptr to required ARP_ENTRY
311	mov edi, [Extra] ;edi=buffer for reading	313	mov edi, [Extra] ;edi=buffer for reading
312	mov ecx, ARP_ENTRY_SIZE/2 ; must be even number!!!	314	mov ecx, ARP_ENTRY_SIZE/2 ; must be even number!!!
313	cld	315	cld
314	rep movsw	316	rep movsw
315	jmp .exit	317	jmp .exit
316	;;END GET	318	;;END GET
317		319
318	;;BEGIN IP_TO_MAC	320	;;BEGIN IP_TO_MAC
319	;;Description: it gets an IP from Index, scans each entry in the table and writes	321	;;Description: it gets an IP from Index, scans each entry in the table and writes
320	;; MAC, that relates to specified IP, into buffer specified in Extra.	322	;; MAC, that relates to specified IP, into buffer specified in Extra.
321	;; And if it cannot find an IP-address in the table, it does an ARP-request of that.	323	;; And if it cannot find an IP-address in the table, it does an ARP-request of that.
322	;;IN: Operation: ARP_TABLE_IP_TO_MAC	324	;;IN: Operation: ARP_TABLE_IP_TO_MAC
323	;; Index: IP that should be transformed into MAC	325	;; Index: IP that should be transformed into MAC
324	;; Extra: pointer to buffer where will be written the MAC-address.	326	;; Extra: pointer to buffer where will be written the MAC-address.
325	;;OUT:	327	;;OUT:
326	;; EAX=ARP table entry status code.	328	;; EAX=ARP table entry status code.
327	;; If EAX==ARP_NO_ENTRY, IP isn't found in the table and we have sent the request.	329	;; If EAX==ARP_NO_ENTRY, IP isn't found in the table and we have sent the request.
328	;; If EAX==ARP_AWAITING_RESPONSE, we wait the response from remote system.	330	;; If EAX==ARP_AWAITING_RESPONSE, we wait the response from remote system.
329	;; If EAX==ARP_RESPONSE_TIMEOUT, remote system not responds too long.	331	;; If EAX==ARP_RESPONSE_TIMEOUT, remote system not responds too long.
330	;; If EAX==ARP_VALID_MAPPING, all is ok, we've got a true MAC.	332	;; If EAX==ARP_VALID_MAPPING, all is ok, we've got a true MAC.
331	;;	333	;;
332	;; If MAC will equal to a zero, in the buffer. It means, that IP-address was not yet	334	;; If MAC will equal to a zero, in the buffer. It means, that IP-address was not yet
333	;; resolved, or that doesn't exist. I recommend you, to do at most 3-5 calls of this	335	;; resolved, or that doesn't exist. I recommend you, to do at most 3-5 calls of this
334	;; function with 1sec delay. sure, only if it not return a valid MAC after a first call.	336	;; function with 1sec delay. sure, only if it not return a valid MAC after a first call.
335	;;	337	;;
336	.ip_to_mac:	338	.ip_to_mac:
337		339
338	xor eax, eax	340	xor eax, eax
339	mov edi, dword[Extra]	341	mov edi, dword[Extra]
340	cld	342	cld
341	stosd	343	stosd
342	stosw	344	stosw
343		345
344	cmp dword[NumARP], 0	346	cmp dword[NumARP], 0
345	je .ip_to_mac_send_request ;if ARP-table not contain an entries, we have to request IP.	347	je .ip_to_mac_send_request ;if ARP-table not contain an entries, we have to request IP.
346	;EAX will be containing a zero, it's equal to ARP_NO_ENTRY	348	;EAX will be containing a zero, it's equal to ARP_NO_ENTRY
347		349
348	mov eax, [Index] ;eax=required IP	350	mov eax, [Index] ;eax=required IP
349	mov ecx, dword[NumARP]	351	mov ecx, dword[NumARP]
350	imul esi, ecx, ARP_ENTRY_SIZE ;esi=current ARP-table size	352	imul esi, ecx, ARP_ENTRY_SIZE ;esi=current ARP-table size
351		353
352	@@:	354	@@:
353	sub esi, ARP_ENTRY_SIZE	355	sub esi, ARP_ENTRY_SIZE
354	cmp [ebx + esi], eax ; ebx=ARPTable base	356	cmp [ebx + esi], eax ; ebx=ARPTable base
355	loopnz @b ; Return back if non match	357	loopnz @b ; Return back if non match
356	jnz .ip_to_mac_send_request ; and request IP->MAC if none found in the table	358	jnz .ip_to_mac_send_request ; and request IP->MAC if none found in the table
357		359
358	; Return the entry status in eax	360	; Return the entry status in eax
359	movzx eax, word[ebx + esi + ARP_ENTRY.Status]	361	movzx eax, word[ebx + esi + ARP_ENTRY.Status]
360		362
361	; esi holds index	363	; esi holds index
362	cld	364	cld
363	lea esi, [ebx + esi + ARP_ENTRY.MAC]	365	lea esi, [ebx + esi + ARP_ENTRY.MAC]
364	mov edi, [Extra] ;edi=ptr to buffer for write MAC	366	mov edi, [Extra] ;edi=ptr to buffer for write MAC
365	movsd	367	movsd
366	movsw	368	movsw
367	jmp .exit	369	jmp .exit
368		370
369	.ip_to_mac_send_request:	371	.ip_to_mac_send_request:
370	stdcall arp_request,[Index],stack_ip,node_addr ;TargetIP,SenderIP_ptr,SenderMAC_ptr	372	stdcall arp_request,[Index],stack_ip,node_addr ;TargetIP,SenderIP_ptr,SenderMAC_ptr
371	mov eax, ARP_NO_ENTRY	373	mov eax, ARP_NO_ENTRY
372	jmp .exit	374	jmp .exit
373		375
374	;;END IP_TO_MAC	376	;;END IP_TO_MAC
375		377
376	;;BEGIN GET_ENTRIES_NUMBER	378	;;BEGIN GET_ENTRIES_NUMBER
377	;;Description: returns an ARP-entries number in the ARPTable	379	;;Description: returns an ARP-entries number in the ARPTable
378	;;IN: Operation: ARP_TABLE_GET_ENTRIES_NUMBER	380	;;IN: Operation: ARP_TABLE_GET_ENTRIES_NUMBER
379	;; Index: must be zero	381	;; Index: must be zero
380	;; Extra: must be zero	382	;; Extra: must be zero
381	;;OUT:	383	;;OUT:
382	;; EAX=ARP-entries number in the ARPTable	384	;; EAX=ARP-entries number in the ARPTable
383	.get_entries_number:	385	.get_entries_number:
384	mov eax, dword[NumARP]	386	mov eax, dword[NumARP]
385	jmp .exit	387	jmp .exit
386	;;END GET_ENTRIES_NUMBER	388	;;END GET_ENTRIES_NUMBER
387		389
388	.exit:	390	.exit:
389	ret	391	ret
390	endp	392	endp
391		393
392		394
393	;***************************************************************************	395	;***************************************************************************
394	; Function	396	; Function
395	; arp_handler	397	; arp_handler
396	;	398	;
397	; Description	399	; Description
398	; Called when an ARP packet is received on the ethernet	400	; Called when an ARP packet is received on the ethernet
399	; Header + Data is in Ether_buffer[]	401	; Header + Data is in Ether_buffer[]
400	; It looks to see if the packet is a request to resolve this Hosts	402	; It looks to see if the packet is a request to resolve this Hosts
401	; IP address. If it is, send the ARP reply packet.	403	; IP address. If it is, send the ARP reply packet.
402	; This Hosts IP address is in dword [stack_ip] ( in network format )	404	; This Hosts IP address is in dword [stack_ip] ( in network format )
403	; This Hosts MAC address is in node_addr[6]	405	; This Hosts MAC address is in node_addr[6]
404	; All registers may be destroyed	406	; All registers may be destroyed
405	;	407	;
406	;***************************************************************************	408	;***************************************************************************
407	arp_handler:	409	arp_handler:
408	; Is this a REQUEST?	410	; Is this a REQUEST?
409	; Is this a request for My Host IP	411	; Is this a request for My Host IP
410	; Yes - So construct a response message.	412	; Yes - So construct a response message.
411	; Send this message to the ethernet card for transmission	413	; Send this message to the ethernet card for transmission
412		414
413	stdcall arp_table_manager,ARP_TABLE_ADD,EXTRA_IS_ARP_PACKET_PTR,ETH_FRAME.Data + ARP_PACKET	415	stdcall arp_table_manager,ARP_TABLE_ADD,EXTRA_IS_ARP_PACKET_PTR,ETH_FRAME.Data + ARP_PACKET
414		416
415	inc dword[arp_rx_count] ;increase ARP-packets counter	417	inc dword[arp_rx_count] ;increase ARP-packets counter
416		418
417	cmp word[ETH_FRAME.Data + ARP_PACKET.Opcode], ARP_REQ_OPCODE ; Is this a request packet?	419	cmp word[ETH_FRAME.Data + ARP_PACKET.Opcode], ARP_REQ_OPCODE ; Is this a request packet?
418	jne .exit ; No - so exit	420	jne .exit ; No - so exit
419		421
420	mov eax, [stack_ip]	422	mov eax, [stack_ip]
421	cmp eax, dword[ETH_FRAME.Data + ARP_PACKET.TargetIP] ; Is it looking for my IP address?	423	cmp eax, dword[ETH_FRAME.Data + ARP_PACKET.TargetIP] ; Is it looking for my IP address?
422	jne .exit ; No - so quit now	424	jne .exit ; No - so quit now
423		425
424	; OK, it is a request for my MAC address. Build the frame and send it	426	; OK, it is a request for my MAC address. Build the frame and send it
425	; We can reuse the packet.	427	; We can reuse the packet.
426		428
427	mov word[ETH_FRAME.Data + ARP_PACKET.Opcode], ARP_REP_OPCODE	429	mov word[ETH_FRAME.Data + ARP_PACKET.Opcode], ARP_REP_OPCODE
428		430
429	cld	431	cld
430	mov esi, ETH_FRAME.Data + ARP_PACKET.SenderMAC	432	mov esi, ETH_FRAME.Data + ARP_PACKET.SenderMAC
431	mov edi, ETH_FRAME.Data + ARP_PACKET.TargetMAC	433	mov edi, ETH_FRAME.Data + ARP_PACKET.TargetMAC
432	movsd	434	movsd
433	movsw	435	movsw
434		436
435	mov esi, ETH_FRAME.Data + ARP_PACKET.SenderIP	437	mov esi, ETH_FRAME.Data + ARP_PACKET.SenderIP
436	mov edi, ETH_FRAME.Data + ARP_PACKET.TargetIP	438	mov edi, ETH_FRAME.Data + ARP_PACKET.TargetIP
437	movsd	439	movsd
438		440
439	mov esi, node_addr	441	mov esi, node_addr
440	mov edi, ETH_FRAME.Data + ARP_PACKET.SenderMAC	442	mov edi, ETH_FRAME.Data + ARP_PACKET.SenderMAC
441	movsd	443	movsd
442	movsw	444	movsw
443		445
444	mov esi, stack_ip	446	mov esi, stack_ip
445	mov edi, ETH_FRAME.Data + ARP_PACKET.SenderIP	447	mov edi, ETH_FRAME.Data + ARP_PACKET.SenderIP
446	movsd	448	movsd
447		449
448	; Now, send it!	450	; Now, send it!
449	mov edi, ETH_FRAME.Data + ARP_PACKET.TargetMAC ;ptr to destination MAC address	451	mov edi, ETH_FRAME.Data + ARP_PACKET.TargetMAC ;ptr to destination MAC address
450	mov bx, ETHER_ARP ;type of protocol	452	mov bx, ETHER_ARP ;type of protocol
451	mov ecx, 28 ;data size	453	mov ecx, 28 ;data size
452	mov esi, ETH_FRAME.Data + ARP_PACKET ;ptr to data	454	mov esi, ETH_FRAME.Data + ARP_PACKET ;ptr to data
453	call dword [drvr_transmit] ;transmit packet	455	call dword [drvr_transmit] ;transmit packet
454		456
455	.exit:	457	.exit:
456	ret	458	ret
457		459
458		460
459	;***************************************************************************	461	;***************************************************************************
460	; Function	462	; Function
461	; arp_request [by Johnny_B]	463	; arp_request [by Johnny_B]
462	;	464	;
463	; Description	465	; Description
464	; Sends an ARP request on the ethernet	466	; Sends an ARP request on the ethernet
465	; IN:	467	; IN:
466	; TargetIP : requested IP address	468	; TargetIP : requested IP address
467	; SenderIP_ptr : POINTER to sender's IP address(our system's address)	469	; SenderIP_ptr : POINTER to sender's IP address(our system's address)
468	; SenderMAC_ptr : POINTER to sender's MAC address(our system's address)	470	; SenderMAC_ptr : POINTER to sender's MAC address(our system's address)
469	; OUT:	471	; OUT:
470	; EAX=0 (if all is ok), otherwise EAX is not defined	472	; EAX=0 (if all is ok), otherwise EAX is not defined
471	;	473	;
472	; EBX,ESI,EDI will be saved	474	; EBX,ESI,EDI will be saved
473	;	475	;
474	;***************************************************************************	476	;***************************************************************************
475	proc arp_request stdcall uses ebx esi edi,\	477	proc arp_request stdcall uses ebx esi edi,\
476	TargetIP:DWORD, SenderIP_ptr:DWORD, SenderMAC_ptr:DWORD	478	TargetIP:DWORD, SenderIP_ptr:DWORD, SenderMAC_ptr:DWORD
477		479
478	inc dword[arp_tx_count] ; increase counter	480	inc dword[arp_tx_count] ; increase counter
479		481
480	sub esp, 28 ; allocate memory for ARP_PACKET	482	sub esp, 28 ; allocate memory for ARP_PACKET
481		483
482	mov word[esp + ARP_PACKET.HardwareType],0x0100 ;Ethernet	484	mov word[esp + ARP_PACKET.HardwareType],0x0100 ;Ethernet
483	mov word[esp + ARP_PACKET.ProtocolType],0x0008 ;IP	485	mov word[esp + ARP_PACKET.ProtocolType],0x0008 ;IP
484	mov byte[esp + ARP_PACKET.HardwareSize],0x06 ;MAC-addr length	486	mov byte[esp + ARP_PACKET.HardwareSize],0x06 ;MAC-addr length
485	mov byte[esp + ARP_PACKET.ProtocolSize],0x04 ;IP-addr length	487	mov byte[esp + ARP_PACKET.ProtocolSize],0x04 ;IP-addr length
486	mov word[esp + ARP_PACKET.Opcode],0x0100 ;Request	488	mov word[esp + ARP_PACKET.Opcode],0x0100 ;Request
487		489
488	cld	490	cld
489	mov esi,[SenderMAC_ptr]	491	mov esi,[SenderMAC_ptr]
490	lea edi,[esp + ARP_PACKET.SenderMAC] ;Our MAC-addr	492	lea edi,[esp + ARP_PACKET.SenderMAC] ;Our MAC-addr
491	movsd	493	movsd
492	movsw	494	movsw
493		495
494	mov esi,[SenderIP_ptr]	496	mov esi,[SenderIP_ptr]
495	lea edi,[esp + ARP_PACKET.SenderIP] ;Our IP-addr	497	lea edi,[esp + ARP_PACKET.SenderIP] ;Our IP-addr
496	movsd	498	movsd
497		499

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(root)/kernel/trunk/network/eth_drv/arp.inc – Rev 511 → 593