;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Copyright (C) KolibriOS team 2004-2010. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License ;;
;; ;;
;; ARP.INC ;;
;; ;;
;; Part of the tcp/ip network stack for KolibriOS ;;
;; ;;
;; Based on the work of [Johnny_B] and [smb] ;;
;; ;;
;; Written by hidnplayr@kolibrios.org ;;
;; ;;
;; GNU GENERAL PUBLIC LICENSE ;;
;; Version 2, June- 1991 ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
$Revision: 2629 $
ARP_NO_ENTRY = 0
ARP_VALID_MAPPING = 1
ARP_AWAITING_RESPONSE = 2
ARP_RESPONSE_TIMEOUT = 3
ARP_REQUEST_TTL = 31 ; 20 s
ARP_ENTRY_TTL = 937 ; 600 s
ARP_STATIC_ENTRY = -1
ARP_REQ_OPCODE = 0x0100 ; request
ARP_REP_OPCODE = 0x0200 ; reply
ARP_TABLE_SIZE = 20 ; Size of table
struct ARP_entry
IP dd ?
MAC dp ?
Status dw ?
TTL dw ?
ends
struct ARP_header
HardwareType dw ?
ProtocolType dw ?
HardwareSize db ?
ProtocolSize db ?
Opcode dw ?
SenderMAC dp ?
SenderIP dd ?
TargetMAC dp ?
TargetIP dd ?
ends
align 4
uglobal
NumARP dd ?
ARP_table rb ARP_TABLE_SIZE * sizeof.ARP_entry
ARP_PACKETS_TX rd MAX_NET_DEVICES
ARP_PACKETS_RX rd MAX_NET_DEVICES
endg
;-----------------------------------------------------------------
;
; ARP_init
;
; This function resets all ARP variables
;
;-----------------------------------------------------------------
macro ARP_init {
xor eax, eax
mov [NumARP], eax
mov edi, ARP_PACKETS_TX
mov ecx, 2*MAX_NET_DEVICES
rep stosd
}
;---------------------------------------------------------------------------
;
; ARP_decrease_entry_ttls
;
;---------------------------------------------------------------------------
macro ARP_decrease_entry_ttls {
local .loop
local .exit
; 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
mov ecx, [NumARP]
test ecx, ecx
jz .exit
mov esi, ARP_table
.loop:
cmp [esi + ARP_entry.TTL], ARP_STATIC_ENTRY
je .next
dec [esi + ARP_entry.TTL]
jz .time_out
.next:
add esi, sizeof.ARP_entry
dec ecx
jnz .loop
jmp .exit
.time_out:
cmp [esi + ARP_entry.Status], ARP_AWAITING_RESPONSE
je .response_timeout
push esi ecx
call ARP_del_entry
pop ecx esi
jmp .next
.response_timeout:
mov [esi + ARP_entry.Status], ARP_RESPONSE_TIMEOUT
mov [esi + ARP_entry.TTL], 10
jmp .next
.exit:
}
;-----------------------------------------------------------------
;
; ARP_input
;
; IN: Pointer to buffer in [esp]
; size of buffer in [esp+4]
; packet size (without ethernet header) in ecx
; packet ptr in edx
; OUT: /
;
;-----------------------------------------------------------------
align 4
ARP_input:
DEBUGF 1,"ARP_input - start\n"
cmp ecx, sizeof.ARP_header
jb .exit
;---------------------
; Handle Reply packets
cmp [edx + ARP_header.Opcode], ARP_REP_OPCODE
jne .maybe_request
DEBUGF 1,"ARP_input - it's a reply packet from %u.%u.%u.%u\n",\
[edx + ARP_header.SenderIP]:1, [edx + ARP_header.SenderIP+1]:1,\
[edx + ARP_header.SenderIP+2]:1, [edx + ARP_header.SenderIP+3]:1
mov ecx, [NumARP]
test ecx, ecx
jz .exit
mov eax, [edx + ARP_header.SenderIP]
mov esi, ARP_table
.loop:
cmp [esi + ARP_entry.IP], eax
je .gotit
add esi, sizeof.ARP_entry
dec ecx
jnz .loop
jmp .exit
.gotit:
DEBUGF 1,"ARP_input - found matching entry\n"
cmp [esi + ARP_entry.TTL], ARP_STATIC_ENTRY ; if it is a static entry, dont touch it
je .exit
DEBUGF 1,"ARP_input - updating entry\n"
mov [esi + ARP_entry.Status], ARP_VALID_MAPPING
mov [esi + ARP_entry.TTL], ARP_ENTRY_TTL
mov eax, dword [edx + ARP_header.SenderMAC]
mov dword [esi+ARP_entry.MAC], eax
mov cx, word [edx + ARP_header.SenderMAC + 4]
mov word [esi+ARP_entry.MAC+4], cx
jmp .exit
;-----------------------
; Handle Request packets
.maybe_request:
cmp [edx + ARP_header.Opcode], ARP_REQ_OPCODE
jne .exit
call NET_ptr_to_num
cmp edi, -1
jz .exit
DEBUGF 1,"ARP Request packet through device: %u\n", edi
inc [ARP_PACKETS_RX+4*edi]
mov eax, [IP_LIST+4*edi]
cmp eax, [edx + ARP_header.TargetIP] ; Is it looking for my IP address?
jne .exit
push eax
push edi
; OK, it is a request for one of our MAC addresses.
; Build the frame and send it. We can reuse the buffer. (faster then using ARP_create_packet)
lea esi, [edx + ARP_header.SenderMAC]
lea edi, [edx + ARP_header.TargetMAC]
movsd ; Move Sender Mac to Dest MAC
movsw ;
movsd ; Move sender IP to Dest IP
pop esi
mov esi, [NET_DRV_LIST + 4*esi]
lea esi, [esi + ETH_DEVICE.mac]
lea edi, [edx + ARP_header.SenderMAC]
movsd ; Copy MAC address from in MAC_LIST
movsw ;
pop eax
stosd ; Write our IP
mov [edx + ARP_header.Opcode], ARP_REP_OPCODE
; Now, Fill in ETHERNET header
mov edi, [esp]
lea esi, [edx + ARP_header.TargetMAC]
movsd
movsw
lea esi, [edx + ARP_header.SenderMAC]
movsd
movsw
; mov ax , ETHER_ARP ; It's already there, I'm sure of it!
; stosw
DEBUGF 1,"ARP_input - Sending reply \n"
call [ebx + NET_DEVICE.transmit]
ret
.exit:
call kernel_free
add esp, 4 ; pop (balance stack)
DEBUGF 1,"ARP_input - exiting\n"
ret
;---------------------------------------------------------------------------
;
; ARP_output_request
;
; IN: ip in eax
; OUT: /
;
;---------------------------------------------------------------------------
align 4
ARP_output_request:
DEBUGF 1,"Create ARP Packet\n"
call IPv4_dest_to_dev
push eax ; DestIP
pushd [IP_LIST+edi] ; SenderIP
mov ebx, [NET_DRV_LIST+edi] ; device ptr
lea eax, [ebx + ETH_DEVICE.mac] ; local device mac
mov edx, ETH_BROADCAST ; broadcast mac
mov ecx, sizeof.ARP_header
mov di, ETHER_ARP
call ETH_output
jz .exit
mov ecx, eax
mov [edi + ARP_header.HardwareType], 0x0100 ; Ethernet
mov [edi + ARP_header.ProtocolType], 0x0008 ; IP
mov [edi + ARP_header.HardwareSize], 6 ; MAC-addr length
mov [edi + ARP_header.ProtocolSize], 4 ; IP-addr length
mov [edi + ARP_header.Opcode], ARP_REQ_OPCODE ; Request
add edi, ARP_header.SenderMAC
lea esi, [ebx + ETH_DEVICE.mac] ; SenderMac
movsw ;
movsd ;
pop eax ; SenderIP
stosd ;
mov eax, -1 ; DestMac
stosd ;
stosw ;
pop eax ; DestIP
stosd ;
DEBUGF 1,"ARP Packet for device %x created successfully\n", ebx
push edx ecx
call [ebx + NET_DEVICE.transmit]
ret
.exit:
add esp, 4+4
DEBUGF 1,"Create ARP Packet - failed\n"
sub eax, eax
ret
;-----------------------------------------------------------------
;
; ARP_add_entry (or update)
;
; IN: esi = ptr to entry (can easily be made on the stack)
; OUT: eax = entry #, -1 on error
;
;----------------------------------------------------------------- ; TODO: use a mutex
align 4
ARP_add_entry:
DEBUGF 1,"ARP add entry: "
mov ecx, [NumARP]
test ecx, ecx ; first entry?
jz .add
cmp ecx, ARP_TABLE_SIZE ; list full ?
jae .error
mov eax, dword [esi + ARP_entry.MAC]
mov bx , word [esi + ARP_entry.MAC + 4]
mov edi, ARP_table
.loop:
cmp dword [edi + ARP_entry.MAC], eax ; Check for duplicate MAC's
jne .maybe_next ;
cmp word [edi + ARP_entry.MAC + 4], bx ;
jne .maybe_next ;
cmp [edi + ARP_entry.TTL], ARP_STATIC_ENTRY
jne .notstatic
cmp [esi + ARP_entry.TTL], ARP_STATIC_ENTRY
jne .error
.notstatic:
neg ecx
add ecx, [NumARP]
jmp .add
.maybe_next:
add esi, sizeof.ARP_entry
loop .loop
mov ecx, [NumARP]
.add:
push ecx
imul ecx, sizeof.ARP_entry
lea edi, [ecx + ARP_table]
mov ecx, sizeof.ARP_entry/2
rep movsw
lea esi, [edi - sizeof.ARP_entry]
inc [NumARP]
pop eax
DEBUGF 1,"New entry created: %u\n", eax
.exit:
DEBUGF 1,"Exiting\n"
ret
.error:
DEBUGF 1,"error! \n"
mov eax, -1
ret
;-----------------------------------------------------------------
;
; ARP_del_entry
;
; IN: esi = ptr to arp entry
; OUT: /
;
;-----------------------------------------------------------------
align 4
ARP_del_entry:
DEBUGF 1,"ARP del entry %x, total entrys: %u\n", esi, [NumARP]
mov ecx, ARP_table + (ARP_TABLE_SIZE - 1) * sizeof.ARP_entry
sub ecx, esi
shr ecx, 1
mov edi, esi
lea esi, [edi + sizeof.ARP_entry]
rep movsw
dec [NumARP]
DEBUGF 1,"ARP entry deleted\n"
ret
;-----------------------------------------------------------------
;
; ARP_IP_to_MAC
;
; This function translates an IP address to a MAC address
;
; IN: eax = IPv4 address
; OUT: eax = -1 on error, -2 means request send
; else, ax = first two bytes of mac (high 16 bits of eax will be 0)
; ebx = last four bytes of mac
;
;-----------------------------------------------------------------
align 4
ARP_IP_to_MAC:
DEBUGF 1,"ARP_IP_to_MAC: %u.%u", al, ah
rol eax, 16
DEBUGF 1,".%u.%u\n", al, ah
rol eax, 16
cmp eax, 0xffffffff
je .broadcast
; if ((Remote IP & subnet_mask) == (local IP & subnet_mask ))
; destination is on same subnet
; else, destination is remote and must use a gateway
call IPv4_dest_to_dev
mov ebx, [IP_LIST + edi]
and ebx, [SUBNET_LIST + edi]
mov ecx, eax
and ecx, [SUBNET_LIST + edi]
cmp ecx, ebx
je .local
mov eax, [GATEWAY_LIST + edi]
DEBUGF 1,"requested IP is not on subnet, using default gateway\n"
;--------------------------------
; Try to find the IP in ARP_table
.local:
mov ecx, [NumARP]
test ecx, ecx
jz .not_in_list
mov esi, ARP_table + ARP_entry.IP
.scan_loop:
cmp [esi], eax
je .found_it
add esi, sizeof.ARP_entry
loop .scan_loop
.not_in_list:
DEBUGF 1,"IP not found on list, preparing for ARP request\n"
;--------------------
; Send an ARP request
push eax ; save IP for ARP_output_request
; Now create the ARP entry
pushw ARP_REQUEST_TTL ; TTL
pushw ARP_AWAITING_RESPONSE ; status
pushd 0 ; mac
pushw 0
pushd eax ; ip
mov esi, esp
call ARP_add_entry
add esp, sizeof.ARP_entry
cmp eax, -1
je .full
; And send a request
pop eax
call ARP_output_request ; IP in eax
;; TODO: check if driver could transmit packet
mov eax, -2 ; request send
ret
.found_it:
DEBUGF 1,"found IP in ARPTable\n"
cmp [esi + ARP_entry.Status], ARP_VALID_MAPPING
jne .invalid
movzx eax, word [esi + ARP_entry.MAC]
mov ebx, dword[esi + ARP_entry.MAC+2]
ret
.invalid:
mov eax, -1
ret
.full:
DEBUGF 1,"ARP table is full!\n"
pop eax
mov eax, -1
ret
.broadcast:
mov eax, 0x0000ffff
mov ebx, 0xffffffff
ret
;-----------------------------------------------------------------
;
; ARP_API
;
; This function is called by system function 75
;
; IN: subfunction number in bl
; device number in bh
; ecx, edx, .. depends on subfunction
;
; OUT: ?
;
;-----------------------------------------------------------------
align 4
ARP_api:
movzx eax, bh
shl eax, 2
and ebx, 0xff
cmp ebx, .number
ja .error
jmp dword [.table + 4*ebx]
.table:
dd .packets_tx ; 0
dd .packets_rx ; 1
dd .entries ; 2
dd .read ; 3
dd .write ; 4
dd .remove ; 5
.number = ($ - .table) / 4 - 1
.error:
mov eax, -1
ret
.packets_tx:
mov eax, [ARP_PACKETS_TX + eax]
ret
.packets_rx:
mov eax, [ARP_PACKETS_RX + eax]
ret
.entries:
mov eax, [NumARP]
ret
.read:
cmp ecx, [NumARP]
jae .error
; edi = pointer to buffer
; ecx = # entry
imul ecx, sizeof.ARP_entry
add ecx, ARP_table
mov esi, ecx
mov ecx, sizeof.ARP_entry/2
rep movsw
xor eax, eax
ret
.write:
; esi = pointer to buffer
call ARP_add_entry ;out: eax = entry number, -1 on error
ret
.remove:
; ecx = # entry
cmp ecx, [NumARP]
jae .error
imul ecx, sizeof.ARP_entry
lea esi, [ARP_table + ecx]
call ARP_del_entry
ret