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